diff options
Diffstat (limited to 'libs/libevent/src/http.c')
| -rw-r--r-- | libs/libevent/src/http.c | 4892 |
1 files changed, 0 insertions, 4892 deletions
diff --git a/libs/libevent/src/http.c b/libs/libevent/src/http.c deleted file mode 100644 index fd7ce3cbf2..0000000000 --- a/libs/libevent/src/http.c +++ /dev/null @@ -1,4892 +0,0 @@ -/* - * Copyright (c) 2002-2007 Niels Provos <provos@citi.umich.edu> - * Copyright (c) 2007-2012 Niels Provos and Nick Mathewson - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. The name of the author may not be used to endorse or promote products - * derived from this software without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR - * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES - * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. - * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, - * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT - * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, - * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY - * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT - * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF - * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. - */ - -#include "event2/event-config.h" -#include "evconfig-private.h" - -#ifdef EVENT__HAVE_SYS_PARAM_H -#include <sys/param.h> -#endif -#ifdef EVENT__HAVE_SYS_TYPES_H -#include <sys/types.h> -#endif - -#ifdef HAVE_SYS_IOCCOM_H -#include <sys/ioccom.h> -#endif -#ifdef EVENT__HAVE_SYS_RESOURCE_H -#include <sys/resource.h> -#endif -#ifdef EVENT__HAVE_SYS_TIME_H -#include <sys/time.h> -#endif -#ifdef EVENT__HAVE_SYS_WAIT_H -#include <sys/wait.h> -#endif - -#ifndef _WIN32 -#include <sys/socket.h> -#include <sys/stat.h> -#else -#include <winsock2.h> -#include <ws2tcpip.h> -#endif - -#include <sys/queue.h> - -#ifdef EVENT__HAVE_NETINET_IN_H -#include <netinet/in.h> -#endif -#ifdef EVENT__HAVE_ARPA_INET_H -#include <arpa/inet.h> -#endif -#ifdef EVENT__HAVE_NETDB_H -#include <netdb.h> -#endif - -#ifdef _WIN32 -#include <winsock2.h> -#endif - -#include <errno.h> -#include <stdio.h> -#include <stdlib.h> -#include <string.h> -#ifndef _WIN32 -#include <syslog.h> -#endif -#include <signal.h> -#include <time.h> -#ifdef EVENT__HAVE_UNISTD_H -#include <unistd.h> -#endif -#ifdef EVENT__HAVE_FCNTL_H -#include <fcntl.h> -#endif - -#undef timeout_pending -#undef timeout_initialized - -#include "strlcpy-internal.h" -#include "event2/http.h" -#include "event2/event.h" -#include "event2/buffer.h" -#include "event2/bufferevent.h" -#include "event2/http_struct.h" -#include "event2/http_compat.h" -#include "event2/util.h" -#include "event2/listener.h" -#include "log-internal.h" -#include "util-internal.h" -#include "http-internal.h" -#include "mm-internal.h" -#include "bufferevent-internal.h" - -#ifndef EVENT__HAVE_GETNAMEINFO -#define NI_MAXSERV 32 -#define NI_MAXHOST 1025 - -#ifndef NI_NUMERICHOST -#define NI_NUMERICHOST 1 -#endif - -#ifndef NI_NUMERICSERV -#define NI_NUMERICSERV 2 -#endif - -static int -fake_getnameinfo(const struct sockaddr *sa, size_t salen, char *host, - size_t hostlen, char *serv, size_t servlen, int flags) -{ - struct sockaddr_in *sin = (struct sockaddr_in *)sa; - - if (serv != NULL) { - char tmpserv[16]; - evutil_snprintf(tmpserv, sizeof(tmpserv), - "%d", ntohs(sin->sin_port)); - if (strlcpy(serv, tmpserv, servlen) >= servlen) - return (-1); - } - - if (host != NULL) { - if (flags & NI_NUMERICHOST) { - if (strlcpy(host, inet_ntoa(sin->sin_addr), - hostlen) >= hostlen) - return (-1); - else - return (0); - } else { - struct hostent *hp; - hp = gethostbyaddr((char *)&sin->sin_addr, - sizeof(struct in_addr), AF_INET); - if (hp == NULL) - return (-2); - - if (strlcpy(host, hp->h_name, hostlen) >= hostlen) - return (-1); - else - return (0); - } - } - return (0); -} - -#endif - -#define REQ_VERSION_BEFORE(req, major_v, minor_v) \ - ((req)->major < (major_v) || \ - ((req)->major == (major_v) && (req)->minor < (minor_v))) - -#define REQ_VERSION_ATLEAST(req, major_v, minor_v) \ - ((req)->major > (major_v) || \ - ((req)->major == (major_v) && (req)->minor >= (minor_v))) - -#ifndef MIN -#define MIN(a,b) (((a)<(b))?(a):(b)) -#endif - -extern int debug; - -static evutil_socket_t bind_socket_ai(struct evutil_addrinfo *, int reuse); -static evutil_socket_t bind_socket(const char *, ev_uint16_t, int reuse); -static void name_from_addr(struct sockaddr *, ev_socklen_t, char **, char **); -static int evhttp_associate_new_request_with_connection( - struct evhttp_connection *evcon); -static void evhttp_connection_start_detectclose( - struct evhttp_connection *evcon); -static void evhttp_connection_stop_detectclose( - struct evhttp_connection *evcon); -static void evhttp_request_dispatch(struct evhttp_connection* evcon); -static void evhttp_read_firstline(struct evhttp_connection *evcon, - struct evhttp_request *req); -static void evhttp_read_header(struct evhttp_connection *evcon, - struct evhttp_request *req); -static int evhttp_add_header_internal(struct evkeyvalq *headers, - const char *key, const char *value); -static const char *evhttp_response_phrase_internal(int code); -static void evhttp_get_request(struct evhttp *, evutil_socket_t, struct sockaddr *, ev_socklen_t); -static void evhttp_write_buffer(struct evhttp_connection *, - void (*)(struct evhttp_connection *, void *), void *); -static void evhttp_make_header(struct evhttp_connection *, struct evhttp_request *); - -/* callbacks for bufferevent */ -static void evhttp_read_cb(struct bufferevent *, void *); -static void evhttp_write_cb(struct bufferevent *, void *); -static void evhttp_error_cb(struct bufferevent *bufev, short what, void *arg); -static int evhttp_find_vhost(struct evhttp *http, struct evhttp **outhttp, - const char *hostname); - -#ifndef EVENT__HAVE_STRSEP -/* strsep replacement for platforms that lack it. Only works if - * del is one character long. */ -static char * -strsep(char **s, const char *del) -{ - char *d, *tok; - EVUTIL_ASSERT(strlen(del) == 1); - if (!s || !*s) - return NULL; - tok = *s; - d = strstr(tok, del); - if (d) { - *d = '\0'; - *s = d + 1; - } else - *s = NULL; - return tok; -} -#endif - -static size_t -html_replace(const char ch, const char **escaped) -{ - switch (ch) { - case '<': - *escaped = "<"; - return 4; - case '>': - *escaped = ">"; - return 4; - case '"': - *escaped = """; - return 6; - case '\'': - *escaped = "'"; - return 6; - case '&': - *escaped = "&"; - return 5; - default: - break; - } - - return 1; -} - -/* - * Replaces <, >, ", ' and & with <, >, ", - * ' and & correspondingly. - * - * The returned string needs to be freed by the caller. - */ - -char * -evhttp_htmlescape(const char *html) -{ - size_t i; - size_t new_size = 0, old_size = 0; - char *escaped_html, *p; - - if (html == NULL) - return (NULL); - - old_size = strlen(html); - for (i = 0; i < old_size; ++i) { - const char *replaced = NULL; - const size_t replace_size = html_replace(html[i], &replaced); - if (replace_size > EV_SIZE_MAX - new_size) { - event_warn("%s: html_replace overflow", __func__); - return (NULL); - } - new_size += replace_size; - } - - if (new_size == EV_SIZE_MAX) - return (NULL); - p = escaped_html = mm_malloc(new_size + 1); - if (escaped_html == NULL) { - event_warn("%s: malloc(%lu)", __func__, - (unsigned long)(new_size + 1)); - return (NULL); - } - for (i = 0; i < old_size; ++i) { - const char *replaced = &html[i]; - const size_t len = html_replace(html[i], &replaced); - memcpy(p, replaced, len); - p += len; - } - - *p = '\0'; - - return (escaped_html); -} - -/** Given an evhttp_cmd_type, returns a constant string containing the - * equivalent HTTP command, or NULL if the evhttp_command_type is - * unrecognized. */ -static const char * -evhttp_method(enum evhttp_cmd_type type) -{ - const char *method; - - switch (type) { - case EVHTTP_REQ_GET: - method = "GET"; - break; - case EVHTTP_REQ_POST: - method = "POST"; - break; - case EVHTTP_REQ_HEAD: - method = "HEAD"; - break; - case EVHTTP_REQ_PUT: - method = "PUT"; - break; - case EVHTTP_REQ_DELETE: - method = "DELETE"; - break; - case EVHTTP_REQ_OPTIONS: - method = "OPTIONS"; - break; - case EVHTTP_REQ_TRACE: - method = "TRACE"; - break; - case EVHTTP_REQ_CONNECT: - method = "CONNECT"; - break; - case EVHTTP_REQ_PATCH: - method = "PATCH"; - break; - default: - method = NULL; - break; - } - - return (method); -} - -/** - * Determines if a response should have a body. - * Follows the rules in RFC 2616 section 4.3. - * @return 1 if the response MUST have a body; 0 if the response MUST NOT have - * a body. - */ -static int -evhttp_response_needs_body(struct evhttp_request *req) -{ - return (req->response_code != HTTP_NOCONTENT && - req->response_code != HTTP_NOTMODIFIED && - (req->response_code < 100 || req->response_code >= 200) && - req->type != EVHTTP_REQ_HEAD); -} - -/** Helper: called after we've added some data to an evcon's bufferevent's - * output buffer. Sets the evconn's writing-is-done callback, and puts - * the bufferevent into writing mode. - */ -static void -evhttp_write_buffer(struct evhttp_connection *evcon, - void (*cb)(struct evhttp_connection *, void *), void *arg) -{ - event_debug(("%s: preparing to write buffer\n", __func__)); - - /* Set call back */ - evcon->cb = cb; - evcon->cb_arg = arg; - - /* Disable the read callback: we don't actually care about data; - * we only care about close detection. (We don't disable reading, - * since we *do* want to learn about any close events.) */ - bufferevent_setcb(evcon->bufev, - NULL, /*read*/ - evhttp_write_cb, - evhttp_error_cb, - evcon); - - bufferevent_enable(evcon->bufev, EV_WRITE); -} - -static void -evhttp_send_continue_done(struct evhttp_connection *evcon, void *arg) -{ - bufferevent_disable(evcon->bufev, EV_WRITE); -} - -static void -evhttp_send_continue(struct evhttp_connection *evcon, - struct evhttp_request *req) -{ - bufferevent_enable(evcon->bufev, EV_WRITE); - evbuffer_add_printf(bufferevent_get_output(evcon->bufev), - "HTTP/%d.%d 100 Continue\r\n\r\n", - req->major, req->minor); - evcon->cb = evhttp_send_continue_done; - evcon->cb_arg = NULL; - bufferevent_setcb(evcon->bufev, - evhttp_read_cb, - evhttp_write_cb, - evhttp_error_cb, - evcon); -} - -/** Helper: returns true iff evconn is in any connected state. */ -static int -evhttp_connected(struct evhttp_connection *evcon) -{ - switch (evcon->state) { - case EVCON_DISCONNECTED: - case EVCON_CONNECTING: - return (0); - case EVCON_IDLE: - case EVCON_READING_FIRSTLINE: - case EVCON_READING_HEADERS: - case EVCON_READING_BODY: - case EVCON_READING_TRAILER: - case EVCON_WRITING: - default: - return (1); - } -} - -/* Create the headers needed for an outgoing HTTP request, adds them to - * the request's header list, and writes the request line to the - * connection's output buffer. - */ -static void -evhttp_make_header_request(struct evhttp_connection *evcon, - struct evhttp_request *req) -{ - const char *method; - - evhttp_remove_header(req->output_headers, "Proxy-Connection"); - - /* Generate request line */ - method = evhttp_method(req->type); - evbuffer_add_printf(bufferevent_get_output(evcon->bufev), - "%s %s HTTP/%d.%d\r\n", - method, req->uri, req->major, req->minor); - - /* Add the content length on a post or put request if missing */ - if ((req->type == EVHTTP_REQ_POST || req->type == EVHTTP_REQ_PUT) && - evhttp_find_header(req->output_headers, "Content-Length") == NULL){ - char size[22]; - evutil_snprintf(size, sizeof(size), EV_SIZE_FMT, - EV_SIZE_ARG(evbuffer_get_length(req->output_buffer))); - evhttp_add_header(req->output_headers, "Content-Length", size); - } -} - -/** Return true if the list of headers in 'headers', intepreted with respect - * to flags, means that we should send a "connection: close" when the request - * is done. */ -static int -evhttp_is_connection_close(int flags, struct evkeyvalq* headers) -{ - if (flags & EVHTTP_PROXY_REQUEST) { - /* proxy connection */ - const char *connection = evhttp_find_header(headers, "Proxy-Connection"); - return (connection == NULL || evutil_ascii_strcasecmp(connection, "keep-alive") != 0); - } else { - const char *connection = evhttp_find_header(headers, "Connection"); - return (connection != NULL && evutil_ascii_strcasecmp(connection, "close") == 0); - } -} -static int -evhttp_is_request_connection_close(struct evhttp_request *req) -{ - return - evhttp_is_connection_close(req->flags, req->input_headers) || - evhttp_is_connection_close(req->flags, req->output_headers); -} - -/* Return true iff 'headers' contains 'Connection: keep-alive' */ -static int -evhttp_is_connection_keepalive(struct evkeyvalq* headers) -{ - const char *connection = evhttp_find_header(headers, "Connection"); - return (connection != NULL - && evutil_ascii_strncasecmp(connection, "keep-alive", 10) == 0); -} - -/* Add a correct "Date" header to headers, unless it already has one. */ -static void -evhttp_maybe_add_date_header(struct evkeyvalq *headers) -{ - if (evhttp_find_header(headers, "Date") == NULL) { - char date[50]; -#ifndef _WIN32 - struct tm cur; -#endif - struct tm *cur_p; - time_t t = time(NULL); -#ifdef _WIN32 - cur_p = gmtime(&t); -#else - gmtime_r(&t, &cur); - cur_p = &cur; -#endif - if (strftime(date, sizeof(date), - "%a, %d %b %Y %H:%M:%S GMT", cur_p) != 0) { - evhttp_add_header(headers, "Date", date); - } - } -} - -/* Add a "Content-Length" header with value 'content_length' to headers, - * unless it already has a content-length or transfer-encoding header. */ -static void -evhttp_maybe_add_content_length_header(struct evkeyvalq *headers, - size_t content_length) -{ - if (evhttp_find_header(headers, "Transfer-Encoding") == NULL && - evhttp_find_header(headers, "Content-Length") == NULL) { - char len[22]; - evutil_snprintf(len, sizeof(len), EV_SIZE_FMT, - EV_SIZE_ARG(content_length)); - evhttp_add_header(headers, "Content-Length", len); - } -} - -/* - * Create the headers needed for an HTTP reply in req->output_headers, - * and write the first HTTP response for req line to evcon. - */ -static void -evhttp_make_header_response(struct evhttp_connection *evcon, - struct evhttp_request *req) -{ - int is_keepalive = evhttp_is_connection_keepalive(req->input_headers); - evbuffer_add_printf(bufferevent_get_output(evcon->bufev), - "HTTP/%d.%d %d %s\r\n", - req->major, req->minor, req->response_code, - req->response_code_line); - - if (req->major == 1) { - if (req->minor >= 1) - evhttp_maybe_add_date_header(req->output_headers); - - /* - * if the protocol is 1.0; and the connection was keep-alive - * we need to add a keep-alive header, too. - */ - if (req->minor == 0 && is_keepalive) - evhttp_add_header(req->output_headers, - "Connection", "keep-alive"); - - if ((req->minor >= 1 || is_keepalive) && - evhttp_response_needs_body(req)) { - /* - * we need to add the content length if the - * user did not give it, this is required for - * persistent connections to work. - */ - evhttp_maybe_add_content_length_header( - req->output_headers, - evbuffer_get_length(req->output_buffer)); - } - } - - /* Potentially add headers for unidentified content. */ - if (evhttp_response_needs_body(req)) { - if (evhttp_find_header(req->output_headers, - "Content-Type") == NULL - && evcon->http_server->default_content_type) { - evhttp_add_header(req->output_headers, - "Content-Type", - evcon->http_server->default_content_type); - } - } - - /* if the request asked for a close, we send a close, too */ - if (evhttp_is_connection_close(req->flags, req->input_headers)) { - evhttp_remove_header(req->output_headers, "Connection"); - if (!(req->flags & EVHTTP_PROXY_REQUEST)) - evhttp_add_header(req->output_headers, "Connection", "close"); - evhttp_remove_header(req->output_headers, "Proxy-Connection"); - } -} - -/** Generate all headers appropriate for sending the http request in req (or - * the response, if we're sending a response), and write them to evcon's - * bufferevent. Also writes all data from req->output_buffer */ -static void -evhttp_make_header(struct evhttp_connection *evcon, struct evhttp_request *req) -{ - struct evkeyval *header; - struct evbuffer *output = bufferevent_get_output(evcon->bufev); - - /* - * Depending if this is a HTTP request or response, we might need to - * add some new headers or remove existing headers. - */ - if (req->kind == EVHTTP_REQUEST) { - evhttp_make_header_request(evcon, req); - } else { - evhttp_make_header_response(evcon, req); - } - - TAILQ_FOREACH(header, req->output_headers, next) { - evbuffer_add_printf(output, "%s: %s\r\n", - header->key, header->value); - } - evbuffer_add(output, "\r\n", 2); - - if (evbuffer_get_length(req->output_buffer) > 0) { - /* - * For a request, we add the POST data, for a reply, this - * is the regular data. - */ - /* XXX We might want to support waiting (a limited amount of - time) for a continue status line from the server before - sending POST/PUT message bodies. */ - evbuffer_add_buffer(output, req->output_buffer); - } -} - -void -evhttp_connection_set_max_headers_size(struct evhttp_connection *evcon, - ev_ssize_t new_max_headers_size) -{ - if (new_max_headers_size<0) - evcon->max_headers_size = EV_SIZE_MAX; - else - evcon->max_headers_size = new_max_headers_size; -} -void -evhttp_connection_set_max_body_size(struct evhttp_connection* evcon, - ev_ssize_t new_max_body_size) -{ - if (new_max_body_size<0) - evcon->max_body_size = EV_UINT64_MAX; - else - evcon->max_body_size = new_max_body_size; -} - -static int -evhttp_connection_incoming_fail(struct evhttp_request *req, - enum evhttp_request_error error) -{ - switch (error) { - case EVREQ_HTTP_TIMEOUT: - case EVREQ_HTTP_EOF: - /* - * these are cases in which we probably should just - * close the connection and not send a reply. this - * case may happen when a browser keeps a persistent - * connection open and we timeout on the read. when - * the request is still being used for sending, we - * need to disassociated it from the connection here. - */ - if (!req->userdone) { - /* remove it so that it will not be freed */ - TAILQ_REMOVE(&req->evcon->requests, req, next); - /* indicate that this request no longer has a - * connection object - */ - req->evcon = NULL; - } - return (-1); - case EVREQ_HTTP_INVALID_HEADER: - case EVREQ_HTTP_BUFFER_ERROR: - case EVREQ_HTTP_REQUEST_CANCEL: - case EVREQ_HTTP_DATA_TOO_LONG: - default: /* xxx: probably should just error on default */ - /* the callback looks at the uri to determine errors */ - if (req->uri) { - mm_free(req->uri); - req->uri = NULL; - } - if (req->uri_elems) { - evhttp_uri_free(req->uri_elems); - req->uri_elems = NULL; - } - - /* - * the callback needs to send a reply, once the reply has - * been send, the connection should get freed. - */ - (*req->cb)(req, req->cb_arg); - } - - return (0); -} - -/* Free connection ownership of which can be acquired by user using - * evhttp_request_own(). */ -static inline void -evhttp_request_free_auto(struct evhttp_request *req) -{ - if (!(req->flags & EVHTTP_USER_OWNED)) - evhttp_request_free(req); -} - -static void -evhttp_request_free_(struct evhttp_connection *evcon, struct evhttp_request *req) -{ - TAILQ_REMOVE(&evcon->requests, req, next); - evhttp_request_free_auto(req); -} - -/* Called when evcon has experienced a (non-recoverable? -NM) error, as - * given in error. If it's an outgoing connection, reset the connection, - * retry any pending requests, and inform the user. If it's incoming, - * delegates to evhttp_connection_incoming_fail(). */ -void -evhttp_connection_fail_(struct evhttp_connection *evcon, - enum evhttp_request_error error) -{ - const int errsave = EVUTIL_SOCKET_ERROR(); - struct evhttp_request* req = TAILQ_FIRST(&evcon->requests); - void (*cb)(struct evhttp_request *, void *); - void *cb_arg; - void (*error_cb)(enum evhttp_request_error, void *); - void *error_cb_arg; - EVUTIL_ASSERT(req != NULL); - - bufferevent_disable(evcon->bufev, EV_READ|EV_WRITE); - - if (evcon->flags & EVHTTP_CON_INCOMING) { - /* - * for incoming requests, there are two different - * failure cases. it's either a network level error - * or an http layer error. for problems on the network - * layer like timeouts we just drop the connections. - * For HTTP problems, we might have to send back a - * reply before the connection can be freed. - */ - if (evhttp_connection_incoming_fail(req, error) == -1) - evhttp_connection_free(evcon); - return; - } - - error_cb = req->error_cb; - error_cb_arg = req->cb_arg; - /* when the request was canceled, the callback is not executed */ - if (error != EVREQ_HTTP_REQUEST_CANCEL) { - /* save the callback for later; the cb might free our object */ - cb = req->cb; - cb_arg = req->cb_arg; - } else { - cb = NULL; - cb_arg = NULL; - } - - /* do not fail all requests; the next request is going to get - * send over a new connection. when a user cancels a request, - * all other pending requests should be processed as normal - */ - evhttp_request_free_(evcon, req); - - /* reset the connection */ - evhttp_connection_reset_(evcon); - - /* We are trying the next request that was queued on us */ - if (TAILQ_FIRST(&evcon->requests) != NULL) - evhttp_connection_connect_(evcon); - - /* The call to evhttp_connection_reset_ overwrote errno. - * Let's restore the original errno, so that the user's - * callback can have a better idea of what the error was. - */ - EVUTIL_SET_SOCKET_ERROR(errsave); - - /* inform the user */ - if (error_cb != NULL) - error_cb(error, error_cb_arg); - if (cb != NULL) - (*cb)(NULL, cb_arg); -} - -/* Bufferevent callback: invoked when any data has been written from an - * http connection's bufferevent */ -static void -evhttp_write_cb(struct bufferevent *bufev, void *arg) -{ - struct evhttp_connection *evcon = arg; - - /* Activate our call back */ - if (evcon->cb != NULL) - (*evcon->cb)(evcon, evcon->cb_arg); -} - -/** - * Advance the connection state. - * - If this is an outgoing connection, we've just processed the response; - * idle or close the connection. - * - If this is an incoming connection, we've just processed the request; - * respond. - */ -static void -evhttp_connection_done(struct evhttp_connection *evcon) -{ - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - int con_outgoing = evcon->flags & EVHTTP_CON_OUTGOING; - int free_evcon = 0; - - if (con_outgoing) { - /* idle or close the connection */ - int need_close = evhttp_is_request_connection_close(req); - TAILQ_REMOVE(&evcon->requests, req, next); - req->evcon = NULL; - - evcon->state = EVCON_IDLE; - - /* check if we got asked to close the connection */ - if (need_close) - evhttp_connection_reset_(evcon); - - if (TAILQ_FIRST(&evcon->requests) != NULL) { - /* - * We have more requests; reset the connection - * and deal with the next request. - */ - if (!evhttp_connected(evcon)) - evhttp_connection_connect_(evcon); - else - evhttp_request_dispatch(evcon); - } else if (!need_close) { - /* - * The connection is going to be persistent, but we - * need to detect if the other side closes it. - */ - evhttp_connection_start_detectclose(evcon); - } else if ((evcon->flags & EVHTTP_CON_AUTOFREE)) { - /* - * If we have no more requests that need completion - * and we're not waiting for the connection to close - */ - free_evcon = 1; - } - } else { - /* - * incoming connection - we need to leave the request on the - * connection so that we can reply to it. - */ - evcon->state = EVCON_WRITING; - } - - /* notify the user of the request */ - (*req->cb)(req, req->cb_arg); - - /* if this was an outgoing request, we own and it's done. so free it. */ - if (con_outgoing) { - evhttp_request_free_auto(req); - } - - /* If this was the last request of an outgoing connection and we're - * not waiting to receive a connection close event and we want to - * automatically free the connection. We check to ensure our request - * list is empty one last time just in case our callback added a - * new request. - */ - if (free_evcon && TAILQ_FIRST(&evcon->requests) == NULL) { - evhttp_connection_free(evcon); - } -} - -/* - * Handles reading from a chunked request. - * return ALL_DATA_READ: - * all data has been read - * return MORE_DATA_EXPECTED: - * more data is expected - * return DATA_CORRUPTED: - * data is corrupted - * return REQUEST_CANCELED: - * request was canceled by the user calling evhttp_cancel_request - * return DATA_TOO_LONG: - * ran over the maximum limit - */ - -static enum message_read_status -evhttp_handle_chunked_read(struct evhttp_request *req, struct evbuffer *buf) -{ - if (req == NULL || buf == NULL) { - return DATA_CORRUPTED; - } - - while (1) { - size_t buflen; - - if ((buflen = evbuffer_get_length(buf)) == 0) { - break; - } - - /* evbuffer_get_length returns size_t, but len variable is ssize_t, - * check for overflow conditions */ - if (buflen > EV_SSIZE_MAX) { - return DATA_CORRUPTED; - } - - if (req->ntoread < 0) { - /* Read chunk size */ - ev_int64_t ntoread; - char *p = evbuffer_readln(buf, NULL, EVBUFFER_EOL_CRLF); - char *endp; - int error; - if (p == NULL) - break; - /* the last chunk is on a new line? */ - if (strlen(p) == 0) { - mm_free(p); - continue; - } - ntoread = evutil_strtoll(p, &endp, 16); - error = (*p == '\0' || - (*endp != '\0' && *endp != ' ') || - ntoread < 0); - mm_free(p); - if (error) { - /* could not get chunk size */ - return (DATA_CORRUPTED); - } - - /* ntoread is signed int64, body_size is unsigned size_t, check for under/overflow conditions */ - if ((ev_uint64_t)ntoread > EV_SIZE_MAX - req->body_size) { - return DATA_CORRUPTED; - } - - if (req->body_size + (size_t)ntoread > req->evcon->max_body_size) { - /* failed body length test */ - event_debug(("Request body is too long")); - return (DATA_TOO_LONG); - } - - req->body_size += (size_t)ntoread; - req->ntoread = ntoread; - if (req->ntoread == 0) { - /* Last chunk */ - return (ALL_DATA_READ); - } - continue; - } - - /* req->ntoread is signed int64, len is ssize_t, based on arch, - * ssize_t could only be 32b, check for these conditions */ - if (req->ntoread > EV_SSIZE_MAX) { - return DATA_CORRUPTED; - } - - /* don't have enough to complete a chunk; wait for more */ - if (req->ntoread > 0 && buflen < (ev_uint64_t)req->ntoread) - return (MORE_DATA_EXPECTED); - - /* Completed chunk */ - evbuffer_remove_buffer(buf, req->input_buffer, (size_t)req->ntoread); - req->ntoread = -1; - if (req->chunk_cb != NULL) { - req->flags |= EVHTTP_REQ_DEFER_FREE; - (*req->chunk_cb)(req, req->cb_arg); - evbuffer_drain(req->input_buffer, - evbuffer_get_length(req->input_buffer)); - req->flags &= ~EVHTTP_REQ_DEFER_FREE; - if ((req->flags & EVHTTP_REQ_NEEDS_FREE) != 0) { - return (REQUEST_CANCELED); - } - } - } - - return (MORE_DATA_EXPECTED); -} - -static void -evhttp_read_trailer(struct evhttp_connection *evcon, struct evhttp_request *req) -{ - struct evbuffer *buf = bufferevent_get_input(evcon->bufev); - - switch (evhttp_parse_headers_(req, buf)) { - case DATA_CORRUPTED: - case DATA_TOO_LONG: - evhttp_connection_fail_(evcon, EVREQ_HTTP_DATA_TOO_LONG); - break; - case ALL_DATA_READ: - bufferevent_disable(evcon->bufev, EV_READ); - evhttp_connection_done(evcon); - break; - case MORE_DATA_EXPECTED: - case REQUEST_CANCELED: /* ??? */ - default: - break; - } -} - -static void -evhttp_read_body(struct evhttp_connection *evcon, struct evhttp_request *req) -{ - struct evbuffer *buf = bufferevent_get_input(evcon->bufev); - - if (req->chunked) { - switch (evhttp_handle_chunked_read(req, buf)) { - case ALL_DATA_READ: - /* finished last chunk */ - evcon->state = EVCON_READING_TRAILER; - evhttp_read_trailer(evcon, req); - return; - case DATA_CORRUPTED: - case DATA_TOO_LONG: - /* corrupted data */ - evhttp_connection_fail_(evcon, - EVREQ_HTTP_DATA_TOO_LONG); - return; - case REQUEST_CANCELED: - /* request canceled */ - evhttp_request_free_auto(req); - return; - case MORE_DATA_EXPECTED: - default: - break; - } - } else if (req->ntoread < 0) { - /* Read until connection close. */ - if ((size_t)(req->body_size + evbuffer_get_length(buf)) < req->body_size) { - evhttp_connection_fail_(evcon, EVREQ_HTTP_INVALID_HEADER); - return; - } - - req->body_size += evbuffer_get_length(buf); - evbuffer_add_buffer(req->input_buffer, buf); - } else if (req->chunk_cb != NULL || evbuffer_get_length(buf) >= (size_t)req->ntoread) { - /* XXX: the above get_length comparison has to be fixed for overflow conditions! */ - /* We've postponed moving the data until now, but we're - * about to use it. */ - size_t n = evbuffer_get_length(buf); - - if (n > (size_t) req->ntoread) - n = (size_t) req->ntoread; - req->ntoread -= n; - req->body_size += n; - evbuffer_remove_buffer(buf, req->input_buffer, n); - } - - if (req->body_size > req->evcon->max_body_size || - (!req->chunked && req->ntoread >= 0 && - (size_t)req->ntoread > req->evcon->max_body_size)) { - /* XXX: The above casted comparison must checked for overflow */ - /* failed body length test */ - event_debug(("Request body is too long")); - evhttp_connection_fail_(evcon, - EVREQ_HTTP_DATA_TOO_LONG); - return; - } - - if (evbuffer_get_length(req->input_buffer) > 0 && req->chunk_cb != NULL) { - req->flags |= EVHTTP_REQ_DEFER_FREE; - (*req->chunk_cb)(req, req->cb_arg); - req->flags &= ~EVHTTP_REQ_DEFER_FREE; - evbuffer_drain(req->input_buffer, - evbuffer_get_length(req->input_buffer)); - if ((req->flags & EVHTTP_REQ_NEEDS_FREE) != 0) { - evhttp_request_free_auto(req); - return; - } - } - - if (req->ntoread == 0) { - bufferevent_disable(evcon->bufev, EV_READ); - /* Completed content length */ - evhttp_connection_done(evcon); - return; - } -} - -#define get_deferred_queue(evcon) \ - ((evcon)->base) - -/* - * Gets called when more data becomes available - */ - -static void -evhttp_read_cb(struct bufferevent *bufev, void *arg) -{ - struct evhttp_connection *evcon = arg; - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - - /* Cancel if it's pending. */ - event_deferred_cb_cancel_(get_deferred_queue(evcon), - &evcon->read_more_deferred_cb); - - switch (evcon->state) { - case EVCON_READING_FIRSTLINE: - evhttp_read_firstline(evcon, req); - /* note the request may have been freed in - * evhttp_read_body */ - break; - case EVCON_READING_HEADERS: - evhttp_read_header(evcon, req); - /* note the request may have been freed in - * evhttp_read_body */ - break; - case EVCON_READING_BODY: - evhttp_read_body(evcon, req); - /* note the request may have been freed in - * evhttp_read_body */ - break; - case EVCON_READING_TRAILER: - evhttp_read_trailer(evcon, req); - break; - case EVCON_IDLE: - { -#ifdef USE_DEBUG - struct evbuffer *input; - size_t total_len; - - input = bufferevent_get_input(evcon->bufev); - total_len = evbuffer_get_length(input); - event_debug(("%s: read "EV_SIZE_FMT - " bytes in EVCON_IDLE state," - " resetting connection", - __func__, EV_SIZE_ARG(total_len))); -#endif - - evhttp_connection_reset_(evcon); - } - break; - case EVCON_DISCONNECTED: - case EVCON_CONNECTING: - case EVCON_WRITING: - default: - event_errx(1, "%s: illegal connection state %d", - __func__, evcon->state); - } -} - -static void -evhttp_deferred_read_cb(struct event_callback *cb, void *data) -{ - struct evhttp_connection *evcon = data; - evhttp_read_cb(evcon->bufev, evcon); -} - -static void -evhttp_write_connectioncb(struct evhttp_connection *evcon, void *arg) -{ - /* This is after writing the request to the server */ - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - EVUTIL_ASSERT(req != NULL); - - EVUTIL_ASSERT(evcon->state == EVCON_WRITING); - - /* We need to wait until we've written all of our output data before we can continue */ - if (evbuffer_get_length(bufferevent_get_output(evcon->bufev)) > 0) { return; } - - /* We are done writing our header and are now expecting the response */ - req->kind = EVHTTP_RESPONSE; - - evhttp_start_read_(evcon); -} - -/* - * Clean up a connection object - */ - -void -evhttp_connection_free(struct evhttp_connection *evcon) -{ - struct evhttp_request *req; - - /* notify interested parties that this connection is going down */ - if (evcon->fd != -1) { - if (evhttp_connected(evcon) && evcon->closecb != NULL) - (*evcon->closecb)(evcon, evcon->closecb_arg); - } - - /* remove all requests that might be queued on this - * connection. for server connections, this should be empty. - * because it gets dequeued either in evhttp_connection_done or - * evhttp_connection_fail_. - */ - while ((req = TAILQ_FIRST(&evcon->requests)) != NULL) { - evhttp_request_free_(evcon, req); - } - - if (evcon->http_server != NULL) { - struct evhttp *http = evcon->http_server; - TAILQ_REMOVE(&http->connections, evcon, next); - } - - if (event_initialized(&evcon->retry_ev)) { - event_del(&evcon->retry_ev); - event_debug_unassign(&evcon->retry_ev); - } - - if (evcon->bufev != NULL) - bufferevent_free(evcon->bufev); - - event_deferred_cb_cancel_(get_deferred_queue(evcon), - &evcon->read_more_deferred_cb); - - if (evcon->fd != -1) { - bufferevent_disable(evcon->bufev, EV_READ|EV_WRITE); - shutdown(evcon->fd, EVUTIL_SHUT_WR); - if (!(bufferevent_get_options_(evcon->bufev) & BEV_OPT_CLOSE_ON_FREE)) { - evutil_closesocket(evcon->fd); - } - } - - if (evcon->bind_address != NULL) - mm_free(evcon->bind_address); - - if (evcon->address != NULL) - mm_free(evcon->address); - - mm_free(evcon); -} - -void -evhttp_connection_free_on_completion(struct evhttp_connection *evcon) { - evcon->flags |= EVHTTP_CON_AUTOFREE; -} - -void -evhttp_connection_set_local_address(struct evhttp_connection *evcon, - const char *address) -{ - EVUTIL_ASSERT(evcon->state == EVCON_DISCONNECTED); - if (evcon->bind_address) - mm_free(evcon->bind_address); - if ((evcon->bind_address = mm_strdup(address)) == NULL) - event_warn("%s: strdup", __func__); -} - -void -evhttp_connection_set_local_port(struct evhttp_connection *evcon, - ev_uint16_t port) -{ - EVUTIL_ASSERT(evcon->state == EVCON_DISCONNECTED); - evcon->bind_port = port; -} - -static void -evhttp_request_dispatch(struct evhttp_connection* evcon) -{ - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - - /* this should not usually happy but it's possible */ - if (req == NULL) - return; - - /* delete possible close detection events */ - evhttp_connection_stop_detectclose(evcon); - - /* we assume that the connection is connected already */ - EVUTIL_ASSERT(evcon->state == EVCON_IDLE); - - evcon->state = EVCON_WRITING; - - /* Create the header from the store arguments */ - evhttp_make_header(evcon, req); - - evhttp_write_buffer(evcon, evhttp_write_connectioncb, NULL); -} - -/* Reset our connection state: disables reading/writing, closes our fd (if -* any), clears out buffers, and puts us in state DISCONNECTED. */ -void -evhttp_connection_reset_(struct evhttp_connection *evcon) -{ - struct evbuffer *tmp; - - /* XXXX This is not actually an optimal fix. Instead we ought to have - an API for "stop connecting", or use bufferevent_setfd to turn off - connecting. But for Libevent 2.0, this seems like a minimal change - least likely to disrupt the rest of the bufferevent and http code. - - Why is this here? If the fd is set in the bufferevent, and the - bufferevent is connecting, then you can't actually stop the - bufferevent from trying to connect with bufferevent_disable(). The - connect will never trigger, since we close the fd, but the timeout - might. That caused an assertion failure in evhttp_connection_fail_. - */ - bufferevent_disable_hard_(evcon->bufev, EV_READ|EV_WRITE); - - if (evcon->fd != -1) { - /* inform interested parties about connection close */ - if (evhttp_connected(evcon) && evcon->closecb != NULL) - (*evcon->closecb)(evcon, evcon->closecb_arg); - - shutdown(evcon->fd, EVUTIL_SHUT_WR); - evutil_closesocket(evcon->fd); - bufferevent_setfd(evcon->bufev, -1); - evcon->fd = -1; - } - - /* we need to clean up any buffered data */ - tmp = bufferevent_get_output(evcon->bufev); - evbuffer_drain(tmp, evbuffer_get_length(tmp)); - tmp = bufferevent_get_input(evcon->bufev); - evbuffer_drain(tmp, evbuffer_get_length(tmp)); - - evcon->state = EVCON_DISCONNECTED; -} - -static void -evhttp_connection_start_detectclose(struct evhttp_connection *evcon) -{ - evcon->flags |= EVHTTP_CON_CLOSEDETECT; - - bufferevent_enable(evcon->bufev, EV_READ); -} - -static void -evhttp_connection_stop_detectclose(struct evhttp_connection *evcon) -{ - evcon->flags &= ~EVHTTP_CON_CLOSEDETECT; - - bufferevent_disable(evcon->bufev, EV_READ); -} - -static void -evhttp_connection_retry(evutil_socket_t fd, short what, void *arg) -{ - struct evhttp_connection *evcon = arg; - - evcon->state = EVCON_DISCONNECTED; - evhttp_connection_connect_(evcon); -} - -static void -evhttp_connection_cb_cleanup(struct evhttp_connection *evcon) -{ - struct evcon_requestq requests; - - evhttp_connection_reset_(evcon); - if (evcon->retry_max < 0 || evcon->retry_cnt < evcon->retry_max) { - struct timeval tv_retry = evcon->initial_retry_timeout; - int i; - evtimer_assign(&evcon->retry_ev, evcon->base, evhttp_connection_retry, evcon); - /* XXXX handle failure from evhttp_add_event */ - for (i=0; i < evcon->retry_cnt; ++i) { - tv_retry.tv_usec *= 2; - if (tv_retry.tv_usec > 1000000) { - tv_retry.tv_usec -= 1000000; - tv_retry.tv_sec += 1; - } - tv_retry.tv_sec *= 2; - if (tv_retry.tv_sec > 3600) { - tv_retry.tv_sec = 3600; - tv_retry.tv_usec = 0; - } - } - event_add(&evcon->retry_ev, &tv_retry); - evcon->retry_cnt++; - return; - } - - /* - * User callback can do evhttp_make_request() on the same - * evcon so new request will be added to evcon->requests. To - * avoid freeing it prematurely we iterate over the copy of - * the queue. - */ - TAILQ_INIT(&requests); - while (TAILQ_FIRST(&evcon->requests) != NULL) { - struct evhttp_request *request = TAILQ_FIRST(&evcon->requests); - TAILQ_REMOVE(&evcon->requests, request, next); - TAILQ_INSERT_TAIL(&requests, request, next); - } - - /* for now, we just signal all requests by executing their callbacks */ - while (TAILQ_FIRST(&requests) != NULL) { - struct evhttp_request *request = TAILQ_FIRST(&requests); - TAILQ_REMOVE(&requests, request, next); - request->evcon = NULL; - - /* we might want to set an error here */ - request->cb(request, request->cb_arg); - evhttp_request_free_auto(request); - } -} - -static void -evhttp_error_cb(struct bufferevent *bufev, short what, void *arg) -{ - struct evhttp_connection *evcon = arg; - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - - if (evcon->fd == -1) - evcon->fd = bufferevent_getfd(bufev); - - switch (evcon->state) { - case EVCON_CONNECTING: - if (what & BEV_EVENT_TIMEOUT) { - event_debug(("%s: connection timeout for \"%s:%d\" on " - EV_SOCK_FMT, - __func__, evcon->address, evcon->port, - EV_SOCK_ARG(evcon->fd))); - evhttp_connection_cb_cleanup(evcon); - return; - } - break; - - case EVCON_READING_BODY: - if (!req->chunked && req->ntoread < 0 - && what == (BEV_EVENT_READING|BEV_EVENT_EOF)) { - /* EOF on read can be benign */ - evhttp_connection_done(evcon); - return; - } - break; - - case EVCON_DISCONNECTED: - case EVCON_IDLE: - case EVCON_READING_FIRSTLINE: - case EVCON_READING_HEADERS: - case EVCON_READING_TRAILER: - case EVCON_WRITING: - default: - break; - } - - /* when we are in close detect mode, a read error means that - * the other side closed their connection. - */ - if (evcon->flags & EVHTTP_CON_CLOSEDETECT) { - evcon->flags &= ~EVHTTP_CON_CLOSEDETECT; - EVUTIL_ASSERT(evcon->http_server == NULL); - /* For connections from the client, we just - * reset the connection so that it becomes - * disconnected. - */ - EVUTIL_ASSERT(evcon->state == EVCON_IDLE); - evhttp_connection_reset_(evcon); - - /* - * If we have no more requests that need completion - * and we want to auto-free the connection when all - * requests have been completed. - */ - if (TAILQ_FIRST(&evcon->requests) == NULL - && (evcon->flags & EVHTTP_CON_OUTGOING) - && (evcon->flags & EVHTTP_CON_AUTOFREE)) { - evhttp_connection_free(evcon); - } - return; - } - - if (what & BEV_EVENT_TIMEOUT) { - evhttp_connection_fail_(evcon, EVREQ_HTTP_TIMEOUT); - } else if (what & (BEV_EVENT_EOF|BEV_EVENT_ERROR)) { - evhttp_connection_fail_(evcon, EVREQ_HTTP_EOF); - } else if (what == BEV_EVENT_CONNECTED) { - } else { - evhttp_connection_fail_(evcon, EVREQ_HTTP_BUFFER_ERROR); - } -} - -/* - * Event callback for asynchronous connection attempt. - */ -static void -evhttp_connection_cb(struct bufferevent *bufev, short what, void *arg) -{ - struct evhttp_connection *evcon = arg; - int error; - ev_socklen_t errsz = sizeof(error); - - if (evcon->fd == -1) - evcon->fd = bufferevent_getfd(bufev); - - if (!(what & BEV_EVENT_CONNECTED)) { - /* some operating systems return ECONNREFUSED immediately - * when connecting to a local address. the cleanup is going - * to reschedule this function call. - */ -#ifndef _WIN32 - if (errno == ECONNREFUSED) - goto cleanup; -#endif - evhttp_error_cb(bufev, what, arg); - return; - } - - if (evcon->fd == -1) { - event_debug(("%s: bufferevent_getfd returned -1", - __func__)); - goto cleanup; - } - - /* Check if the connection completed */ - if (getsockopt(evcon->fd, SOL_SOCKET, SO_ERROR, (void*)&error, - &errsz) == -1) { - event_debug(("%s: getsockopt for \"%s:%d\" on "EV_SOCK_FMT, - __func__, evcon->address, evcon->port, - EV_SOCK_ARG(evcon->fd))); - goto cleanup; - } - - if (error) { - event_debug(("%s: connect failed for \"%s:%d\" on " - EV_SOCK_FMT": %s", - __func__, evcon->address, evcon->port, - EV_SOCK_ARG(evcon->fd), - evutil_socket_error_to_string(error))); - goto cleanup; - } - - /* We are connected to the server now */ - event_debug(("%s: connected to \"%s:%d\" on "EV_SOCK_FMT"\n", - __func__, evcon->address, evcon->port, - EV_SOCK_ARG(evcon->fd))); - - /* Reset the retry count as we were successful in connecting */ - evcon->retry_cnt = 0; - evcon->state = EVCON_IDLE; - - /* reset the bufferevent cbs */ - bufferevent_setcb(evcon->bufev, - evhttp_read_cb, - evhttp_write_cb, - evhttp_error_cb, - evcon); - - if (!evutil_timerisset(&evcon->timeout)) { - const struct timeval read_tv = { HTTP_READ_TIMEOUT, 0 }; - const struct timeval write_tv = { HTTP_WRITE_TIMEOUT, 0 }; - bufferevent_set_timeouts(evcon->bufev, &read_tv, &write_tv); - } else { - bufferevent_set_timeouts(evcon->bufev, &evcon->timeout, &evcon->timeout); - } - - /* try to start requests that have queued up on this connection */ - evhttp_request_dispatch(evcon); - return; - - cleanup: - evhttp_connection_cb_cleanup(evcon); -} - -/* - * Check if we got a valid response code. - */ - -static int -evhttp_valid_response_code(int code) -{ - if (code == 0) - return (0); - - return (1); -} - -static int -evhttp_parse_http_version(const char *version, struct evhttp_request *req) -{ - int major, minor; - char ch; - int n = sscanf(version, "HTTP/%d.%d%c", &major, &minor, &ch); - if (n != 2 || major > 1) { - event_debug(("%s: bad version %s on message %p from %s", - __func__, version, req, req->remote_host)); - return (-1); - } - req->major = major; - req->minor = minor; - return (0); -} - -/* Parses the status line of a web server */ - -static int -evhttp_parse_response_line(struct evhttp_request *req, char *line) -{ - char *protocol; - char *number; - const char *readable = ""; - - protocol = strsep(&line, " "); - if (line == NULL) - return (-1); - number = strsep(&line, " "); - if (line != NULL) - readable = line; - - if (evhttp_parse_http_version(protocol, req) < 0) - return (-1); - - req->response_code = atoi(number); - if (!evhttp_valid_response_code(req->response_code)) { - event_debug(("%s: bad response code \"%s\"", - __func__, number)); - return (-1); - } - - if ((req->response_code_line = mm_strdup(readable)) == NULL) { - event_warn("%s: strdup", __func__); - return (-1); - } - - return (0); -} - -/* Parse the first line of a HTTP request */ - -static int -evhttp_parse_request_line(struct evhttp_request *req, char *line) -{ - char *method; - char *uri; - char *version; - const char *hostname; - const char *scheme; - size_t method_len; - enum evhttp_cmd_type type; - - /* Parse the request line */ - method = strsep(&line, " "); - if (line == NULL) - return (-1); - uri = strsep(&line, " "); - if (line == NULL) - return (-1); - version = strsep(&line, " "); - if (line != NULL) - return (-1); - - method_len = (uri - method) - 1; - type = EVHTTP_REQ_UNKNOWN_; - - /* First line */ - switch (method_len) { - case 3: - /* The length of the method string is 3, meaning it can only be one of two methods: GET or PUT */ - - /* Since both GET and PUT share the same character 'T' at the end, - * if the string doesn't have 'T', we can immediately determine this - * is an invalid HTTP method */ - - if (method[2] != 'T') { - break; - } - - switch (*method) { - case 'G': - /* This first byte is 'G', so make sure the next byte is - * 'E', if it isn't then this isn't a valid method */ - - if (method[1] == 'E') { - type = EVHTTP_REQ_GET; - } - - break; - case 'P': - /* First byte is P, check second byte for 'U', if not, - * we know it's an invalid method */ - if (method[1] == 'U') { - type = EVHTTP_REQ_PUT; - } - break; - default: - break; - } - break; - case 4: - /* The method length is 4 bytes, leaving only the methods "POST" and "HEAD" */ - switch (*method) { - case 'P': - if (method[3] == 'T' && method[2] == 'S' && method[1] == 'O') { - type = EVHTTP_REQ_POST; - } - break; - case 'H': - if (method[3] == 'D' && method[2] == 'A' && method[1] == 'E') { - type = EVHTTP_REQ_HEAD; - } - break; - default: - break; - } - break; - case 5: - /* Method length is 5 bytes, which can only encompass PATCH and TRACE */ - switch (*method) { - case 'P': - if (method[4] == 'H' && method[3] == 'C' && method[2] == 'T' && method[1] == 'A') { - type = EVHTTP_REQ_PATCH; - } - break; - case 'T': - if (method[4] == 'E' && method[3] == 'C' && method[2] == 'A' && method[1] == 'R') { - type = EVHTTP_REQ_TRACE; - } - - break; - default: - break; - } - break; - case 6: - /* Method length is 6, only valid method 6 bytes in length is DELEte */ - - /* If the first byte isn't 'D' then it's invalid */ - if (*method != 'D') { - break; - } - - if (method[5] == 'E' && method[4] == 'T' && method[3] == 'E' && method[2] == 'L' && method[1] == 'E') { - type = EVHTTP_REQ_DELETE; - } - - break; - case 7: - /* Method length is 7, only valid methods are "OPTIONS" and "CONNECT" */ - switch (*method) { - case 'O': - if (method[6] == 'S' && method[5] == 'N' && method[4] == 'O' && - method[3] == 'I' && method[2] == 'T' && method[1] == 'P') { - type = EVHTTP_REQ_OPTIONS; - } - - break; - case 'C': - if (method[6] == 'T' && method[5] == 'C' && method[4] == 'E' && - method[3] == 'N' && method[2] == 'N' && method[1] == 'O') { - type = EVHTTP_REQ_CONNECT; - } - - break; - default: - break; - } - break; - } /* switch */ - - if ((int)type == EVHTTP_REQ_UNKNOWN_) { - event_debug(("%s: bad method %s on request %p from %s", - __func__, method, req, req->remote_host)); - /* No error yet; we'll give a better error later when - * we see that req->type is unsupported. */ - } - - req->type = type; - - if (evhttp_parse_http_version(version, req) < 0) - return (-1); - - if ((req->uri = mm_strdup(uri)) == NULL) { - event_debug(("%s: mm_strdup", __func__)); - return (-1); - } - - if ((req->uri_elems = evhttp_uri_parse_with_flags(req->uri, - EVHTTP_URI_NONCONFORMANT)) == NULL) { - return -1; - } - - /* If we have an absolute-URI, check to see if it is an http request - for a known vhost or server alias. If we don't know about this - host, we consider it a proxy request. */ - scheme = evhttp_uri_get_scheme(req->uri_elems); - hostname = evhttp_uri_get_host(req->uri_elems); - if (scheme && (!evutil_ascii_strcasecmp(scheme, "http") || - !evutil_ascii_strcasecmp(scheme, "https")) && - hostname && - !evhttp_find_vhost(req->evcon->http_server, NULL, hostname)) - req->flags |= EVHTTP_PROXY_REQUEST; - - return (0); -} - -const char * -evhttp_find_header(const struct evkeyvalq *headers, const char *key) -{ - struct evkeyval *header; - - TAILQ_FOREACH(header, headers, next) { - if (evutil_ascii_strcasecmp(header->key, key) == 0) - return (header->value); - } - - return (NULL); -} - -void -evhttp_clear_headers(struct evkeyvalq *headers) -{ - struct evkeyval *header; - - for (header = TAILQ_FIRST(headers); - header != NULL; - header = TAILQ_FIRST(headers)) { - TAILQ_REMOVE(headers, header, next); - mm_free(header->key); - mm_free(header->value); - mm_free(header); - } -} - -/* - * Returns 0, if the header was successfully removed. - * Returns -1, if the header could not be found. - */ - -int -evhttp_remove_header(struct evkeyvalq *headers, const char *key) -{ - struct evkeyval *header; - - TAILQ_FOREACH(header, headers, next) { - if (evutil_ascii_strcasecmp(header->key, key) == 0) - break; - } - - if (header == NULL) - return (-1); - - /* Free and remove the header that we found */ - TAILQ_REMOVE(headers, header, next); - mm_free(header->key); - mm_free(header->value); - mm_free(header); - - return (0); -} - -static int -evhttp_header_is_valid_value(const char *value) -{ - const char *p = value; - - while ((p = strpbrk(p, "\r\n")) != NULL) { - /* we really expect only one new line */ - p += strspn(p, "\r\n"); - /* we expect a space or tab for continuation */ - if (*p != ' ' && *p != '\t') - return (0); - } - return (1); -} - -int -evhttp_add_header(struct evkeyvalq *headers, - const char *key, const char *value) -{ - event_debug(("%s: key: %s val: %s\n", __func__, key, value)); - - if (strchr(key, '\r') != NULL || strchr(key, '\n') != NULL) { - /* drop illegal headers */ - event_debug(("%s: dropping illegal header key\n", __func__)); - return (-1); - } - - if (!evhttp_header_is_valid_value(value)) { - event_debug(("%s: dropping illegal header value\n", __func__)); - return (-1); - } - - return (evhttp_add_header_internal(headers, key, value)); -} - -static int -evhttp_add_header_internal(struct evkeyvalq *headers, - const char *key, const char *value) -{ - struct evkeyval *header = mm_calloc(1, sizeof(struct evkeyval)); - if (header == NULL) { - event_warn("%s: calloc", __func__); - return (-1); - } - if ((header->key = mm_strdup(key)) == NULL) { - mm_free(header); - event_warn("%s: strdup", __func__); - return (-1); - } - if ((header->value = mm_strdup(value)) == NULL) { - mm_free(header->key); - mm_free(header); - event_warn("%s: strdup", __func__); - return (-1); - } - - TAILQ_INSERT_TAIL(headers, header, next); - - return (0); -} - -/* - * Parses header lines from a request or a response into the specified - * request object given an event buffer. - * - * Returns - * DATA_CORRUPTED on error - * MORE_DATA_EXPECTED when we need to read more headers - * ALL_DATA_READ when all headers have been read. - */ - -enum message_read_status -evhttp_parse_firstline_(struct evhttp_request *req, struct evbuffer *buffer) -{ - char *line; - enum message_read_status status = ALL_DATA_READ; - - size_t line_length; - /* XXX try */ - line = evbuffer_readln(buffer, &line_length, EVBUFFER_EOL_CRLF); - if (line == NULL) { - if (req->evcon != NULL && - evbuffer_get_length(buffer) > req->evcon->max_headers_size) - return (DATA_TOO_LONG); - else - return (MORE_DATA_EXPECTED); - } - - if (req->evcon != NULL && - line_length > req->evcon->max_headers_size) { - mm_free(line); - return (DATA_TOO_LONG); - } - - req->headers_size = line_length; - - switch (req->kind) { - case EVHTTP_REQUEST: - if (evhttp_parse_request_line(req, line) == -1) - status = DATA_CORRUPTED; - break; - case EVHTTP_RESPONSE: - if (evhttp_parse_response_line(req, line) == -1) - status = DATA_CORRUPTED; - break; - default: - status = DATA_CORRUPTED; - } - - mm_free(line); - return (status); -} - -static int -evhttp_append_to_last_header(struct evkeyvalq *headers, char *line) -{ - struct evkeyval *header = TAILQ_LAST(headers, evkeyvalq); - char *newval; - size_t old_len, line_len; - - if (header == NULL) - return (-1); - - old_len = strlen(header->value); - - /* Strip space from start and end of line. */ - while (*line == ' ' || *line == '\t') - ++line; - evutil_rtrim_lws_(line); - - line_len = strlen(line); - - newval = mm_realloc(header->value, old_len + line_len + 2); - if (newval == NULL) - return (-1); - - newval[old_len] = ' '; - memcpy(newval + old_len + 1, line, line_len + 1); - header->value = newval; - - return (0); -} - -enum message_read_status -evhttp_parse_headers_(struct evhttp_request *req, struct evbuffer* buffer) -{ - enum message_read_status errcode = DATA_CORRUPTED; - char *line; - enum message_read_status status = MORE_DATA_EXPECTED; - - struct evkeyvalq* headers = req->input_headers; - size_t line_length; - while ((line = evbuffer_readln(buffer, &line_length, EVBUFFER_EOL_CRLF)) - != NULL) { - char *skey, *svalue; - - req->headers_size += line_length; - - if (req->evcon != NULL && - req->headers_size > req->evcon->max_headers_size) { - errcode = DATA_TOO_LONG; - goto error; - } - - if (*line == '\0') { /* Last header - Done */ - status = ALL_DATA_READ; - mm_free(line); - break; - } - - /* Check if this is a continuation line */ - if (*line == ' ' || *line == '\t') { - if (evhttp_append_to_last_header(headers, line) == -1) - goto error; - mm_free(line); - continue; - } - - /* Processing of header lines */ - svalue = line; - skey = strsep(&svalue, ":"); - if (svalue == NULL) - goto error; - - svalue += strspn(svalue, " "); - evutil_rtrim_lws_(svalue); - - if (evhttp_add_header(headers, skey, svalue) == -1) - goto error; - - mm_free(line); - } - - if (status == MORE_DATA_EXPECTED) { - if (req->evcon != NULL && - req->headers_size + evbuffer_get_length(buffer) > req->evcon->max_headers_size) - return (DATA_TOO_LONG); - } - - return (status); - - error: - mm_free(line); - return (errcode); -} - -static int -evhttp_get_body_length(struct evhttp_request *req) -{ - struct evkeyvalq *headers = req->input_headers; - const char *content_length; - const char *connection; - - content_length = evhttp_find_header(headers, "Content-Length"); - connection = evhttp_find_header(headers, "Connection"); - - if (content_length == NULL && connection == NULL) - req->ntoread = -1; - else if (content_length == NULL && - evutil_ascii_strcasecmp(connection, "Close") != 0) { - /* Bad combination, we don't know when it will end */ - event_warnx("%s: we got no content length, but the " - "server wants to keep the connection open: %s.", - __func__, connection); - return (-1); - } else if (content_length == NULL) { - req->ntoread = -1; - } else { - char *endp; - ev_int64_t ntoread = evutil_strtoll(content_length, &endp, 10); - if (*content_length == '\0' || *endp != '\0' || ntoread < 0) { - event_debug(("%s: illegal content length: %s", - __func__, content_length)); - return (-1); - } - req->ntoread = ntoread; - } - - event_debug(("%s: bytes to read: "EV_I64_FMT" (in buffer "EV_SIZE_FMT")\n", - __func__, EV_I64_ARG(req->ntoread), - EV_SIZE_ARG(evbuffer_get_length(bufferevent_get_input(req->evcon->bufev))))); - - return (0); -} - -static int -evhttp_method_may_have_body(enum evhttp_cmd_type type) -{ - switch (type) { - case EVHTTP_REQ_POST: - case EVHTTP_REQ_PUT: - case EVHTTP_REQ_PATCH: - return 1; - case EVHTTP_REQ_TRACE: - return 0; - /* XXX May any of the below methods have a body? */ - case EVHTTP_REQ_GET: - case EVHTTP_REQ_HEAD: - case EVHTTP_REQ_DELETE: - case EVHTTP_REQ_OPTIONS: - case EVHTTP_REQ_CONNECT: - return 0; - default: - return 0; - } -} - -static void -evhttp_get_body(struct evhttp_connection *evcon, struct evhttp_request *req) -{ - const char *xfer_enc; - - /* If this is a request without a body, then we are done */ - if (req->kind == EVHTTP_REQUEST && - !evhttp_method_may_have_body(req->type)) { - evhttp_connection_done(evcon); - return; - } - evcon->state = EVCON_READING_BODY; - xfer_enc = evhttp_find_header(req->input_headers, "Transfer-Encoding"); - if (xfer_enc != NULL && evutil_ascii_strcasecmp(xfer_enc, "chunked") == 0) { - req->chunked = 1; - req->ntoread = -1; - } else { - if (evhttp_get_body_length(req) == -1) { - evhttp_connection_fail_(evcon, - EVREQ_HTTP_INVALID_HEADER); - return; - } - if (req->kind == EVHTTP_REQUEST && req->ntoread < 1) { - /* An incoming request with no content-length and no - * transfer-encoding has no body. */ - evhttp_connection_done(evcon); - return; - } - } - - /* Should we send a 100 Continue status line? */ - if (req->kind == EVHTTP_REQUEST && REQ_VERSION_ATLEAST(req, 1, 1)) { - const char *expect; - - expect = evhttp_find_header(req->input_headers, "Expect"); - if (expect) { - if (!evutil_ascii_strcasecmp(expect, "100-continue")) { - /* XXX It would be nice to do some sanity - checking here. Does the resource exist? - Should the resource accept post requests? If - no, we should respond with an error. For - now, just optimistically tell the client to - send their message body. */ - if (req->ntoread > 0) { - /* ntoread is ev_int64_t, max_body_size is ev_uint64_t */ - if ((req->evcon->max_body_size <= EV_INT64_MAX) && (ev_uint64_t)req->ntoread > req->evcon->max_body_size) { - evhttp_send_error(req, HTTP_ENTITYTOOLARGE, NULL); - return; - } - } - if (!evbuffer_get_length(bufferevent_get_input(evcon->bufev))) - evhttp_send_continue(evcon, req); - } else { - evhttp_send_error(req, HTTP_EXPECTATIONFAILED, - NULL); - return; - } - } - } - - evhttp_read_body(evcon, req); - /* note the request may have been freed in evhttp_read_body */ -} - -static void -evhttp_read_firstline(struct evhttp_connection *evcon, - struct evhttp_request *req) -{ - enum message_read_status res; - - res = evhttp_parse_firstline_(req, bufferevent_get_input(evcon->bufev)); - if (res == DATA_CORRUPTED || res == DATA_TOO_LONG) { - /* Error while reading, terminate */ - event_debug(("%s: bad header lines on "EV_SOCK_FMT"\n", - __func__, EV_SOCK_ARG(evcon->fd))); - evhttp_connection_fail_(evcon, EVREQ_HTTP_INVALID_HEADER); - return; - } else if (res == MORE_DATA_EXPECTED) { - /* Need more header lines */ - return; - } - - evcon->state = EVCON_READING_HEADERS; - evhttp_read_header(evcon, req); -} - -static void -evhttp_read_header(struct evhttp_connection *evcon, - struct evhttp_request *req) -{ - enum message_read_status res; - evutil_socket_t fd = evcon->fd; - - res = evhttp_parse_headers_(req, bufferevent_get_input(evcon->bufev)); - if (res == DATA_CORRUPTED || res == DATA_TOO_LONG) { - /* Error while reading, terminate */ - event_debug(("%s: bad header lines on "EV_SOCK_FMT"\n", - __func__, EV_SOCK_ARG(fd))); - evhttp_connection_fail_(evcon, EVREQ_HTTP_INVALID_HEADER); - return; - } else if (res == MORE_DATA_EXPECTED) { - /* Need more header lines */ - return; - } - - /* Callback can shut down connection with negative return value */ - if (req->header_cb != NULL) { - if ((*req->header_cb)(req, req->cb_arg) < 0) { - evhttp_connection_fail_(evcon, EVREQ_HTTP_EOF); - return; - } - } - - /* Done reading headers, do the real work */ - switch (req->kind) { - case EVHTTP_REQUEST: - event_debug(("%s: checking for post data on "EV_SOCK_FMT"\n", - __func__, EV_SOCK_ARG(fd))); - evhttp_get_body(evcon, req); - /* note the request may have been freed in evhttp_get_body */ - break; - - case EVHTTP_RESPONSE: - /* Start over if we got a 100 Continue response. */ - if (req->response_code == 100) { - evhttp_start_read_(evcon); - return; - } - if (!evhttp_response_needs_body(req)) { - event_debug(("%s: skipping body for code %d\n", - __func__, req->response_code)); - evhttp_connection_done(evcon); - } else { - event_debug(("%s: start of read body for %s on " - EV_SOCK_FMT"\n", - __func__, req->remote_host, EV_SOCK_ARG(fd))); - evhttp_get_body(evcon, req); - /* note the request may have been freed in - * evhttp_get_body */ - } - break; - - default: - event_warnx("%s: bad header on "EV_SOCK_FMT, __func__, - EV_SOCK_ARG(fd)); - evhttp_connection_fail_(evcon, EVREQ_HTTP_INVALID_HEADER); - break; - } - /* request may have been freed above */ -} - -/* - * Creates a TCP connection to the specified port and executes a callback - * when finished. Failure or success is indicate by the passed connection - * object. - * - * Although this interface accepts a hostname, it is intended to take - * only numeric hostnames so that non-blocking DNS resolution can - * happen elsewhere. - */ - -struct evhttp_connection * -evhttp_connection_new(const char *address, unsigned short port) -{ - return (evhttp_connection_base_new(NULL, NULL, address, port)); -} - -struct evhttp_connection * -evhttp_connection_base_bufferevent_new(struct event_base *base, struct evdns_base *dnsbase, struct bufferevent* bev, - const char *address, unsigned short port) -{ - struct evhttp_connection *evcon = NULL; - - event_debug(("Attempting connection to %s:%d\n", address, port)); - - if ((evcon = mm_calloc(1, sizeof(struct evhttp_connection))) == NULL) { - event_warn("%s: calloc failed", __func__); - goto error; - } - - evcon->fd = -1; - evcon->port = port; - - evcon->max_headers_size = EV_SIZE_MAX; - evcon->max_body_size = EV_SIZE_MAX; - - evutil_timerclear(&evcon->timeout); - evcon->retry_cnt = evcon->retry_max = 0; - - if ((evcon->address = mm_strdup(address)) == NULL) { - event_warn("%s: strdup failed", __func__); - goto error; - } - - if (bev == NULL) { - if (!(bev = bufferevent_socket_new(base, -1, 0))) { - event_warn("%s: bufferevent_socket_new failed", __func__); - goto error; - } - } - - bufferevent_setcb(bev, evhttp_read_cb, evhttp_write_cb, evhttp_error_cb, evcon); - evcon->bufev = bev; - - evcon->state = EVCON_DISCONNECTED; - TAILQ_INIT(&evcon->requests); - - evcon->initial_retry_timeout.tv_sec = 2; - evcon->initial_retry_timeout.tv_usec = 0; - - if (base != NULL) { - evcon->base = base; - if (bufferevent_get_base(bev) != base) - bufferevent_base_set(base, evcon->bufev); - } - - event_deferred_cb_init_( - &evcon->read_more_deferred_cb, - bufferevent_get_priority(bev), - evhttp_deferred_read_cb, evcon); - - evcon->dns_base = dnsbase; - evcon->ai_family = AF_UNSPEC; - - return (evcon); - - error: - if (evcon != NULL) - evhttp_connection_free(evcon); - return (NULL); -} - -struct bufferevent* evhttp_connection_get_bufferevent(struct evhttp_connection *evcon) -{ - return evcon->bufev; -} - -struct evhttp * -evhttp_connection_get_server(struct evhttp_connection *evcon) -{ - return evcon->http_server; -} - -struct evhttp_connection * -evhttp_connection_base_new(struct event_base *base, struct evdns_base *dnsbase, - const char *address, unsigned short port) -{ - return evhttp_connection_base_bufferevent_new(base, dnsbase, NULL, address, port); -} - -void evhttp_connection_set_family(struct evhttp_connection *evcon, - int family) -{ - evcon->ai_family = family; -} - -int evhttp_connection_set_flags(struct evhttp_connection *evcon, - int flags) -{ - int avail_flags = 0; - avail_flags |= EVHTTP_CON_REUSE_CONNECTED_ADDR; - - if (flags & ~avail_flags || flags > EVHTTP_CON_PUBLIC_FLAGS_END) - return 1; - evcon->flags &= ~avail_flags; - - evcon->flags |= flags; - - return 0; -} - -void -evhttp_connection_set_base(struct evhttp_connection *evcon, - struct event_base *base) -{ - EVUTIL_ASSERT(evcon->base == NULL); - EVUTIL_ASSERT(evcon->state == EVCON_DISCONNECTED); - evcon->base = base; - bufferevent_base_set(base, evcon->bufev); -} - -void -evhttp_connection_set_timeout(struct evhttp_connection *evcon, - int timeout_in_secs) -{ - if (timeout_in_secs == -1) - evhttp_connection_set_timeout_tv(evcon, NULL); - else { - struct timeval tv; - tv.tv_sec = timeout_in_secs; - tv.tv_usec = 0; - evhttp_connection_set_timeout_tv(evcon, &tv); - } -} - -void -evhttp_connection_set_timeout_tv(struct evhttp_connection *evcon, - const struct timeval* tv) -{ - if (tv) { - evcon->timeout = *tv; - bufferevent_set_timeouts(evcon->bufev, &evcon->timeout, &evcon->timeout); - } else { - const struct timeval read_tv = { HTTP_READ_TIMEOUT, 0 }; - const struct timeval write_tv = { HTTP_WRITE_TIMEOUT, 0 }; - evutil_timerclear(&evcon->timeout); - bufferevent_set_timeouts(evcon->bufev, &read_tv, &write_tv); - } -} - -void -evhttp_connection_set_initial_retry_tv(struct evhttp_connection *evcon, - const struct timeval *tv) -{ - if (tv) { - evcon->initial_retry_timeout = *tv; - } else { - evutil_timerclear(&evcon->initial_retry_timeout); - evcon->initial_retry_timeout.tv_sec = 2; - } -} - -void -evhttp_connection_set_retries(struct evhttp_connection *evcon, - int retry_max) -{ - evcon->retry_max = retry_max; -} - -void -evhttp_connection_set_closecb(struct evhttp_connection *evcon, - void (*cb)(struct evhttp_connection *, void *), void *cbarg) -{ - evcon->closecb = cb; - evcon->closecb_arg = cbarg; -} - -void -evhttp_connection_get_peer(struct evhttp_connection *evcon, - char **address, ev_uint16_t *port) -{ - *address = evcon->address; - *port = evcon->port; -} - -const struct sockaddr* -evhttp_connection_get_addr(struct evhttp_connection *evcon) -{ - return bufferevent_socket_get_conn_address_(evcon->bufev); -} - -int -evhttp_connection_connect_(struct evhttp_connection *evcon) -{ - int old_state = evcon->state; - const char *address = evcon->address; - const struct sockaddr *sa = evhttp_connection_get_addr(evcon); - int ret; - - if (evcon->state == EVCON_CONNECTING) - return (0); - - evhttp_connection_reset_(evcon); - - EVUTIL_ASSERT(!(evcon->flags & EVHTTP_CON_INCOMING)); - evcon->flags |= EVHTTP_CON_OUTGOING; - - if (evcon->bind_address || evcon->bind_port) { - evcon->fd = bind_socket( - evcon->bind_address, evcon->bind_port, 0 /*reuse*/); - if (evcon->fd == -1) { - event_debug(("%s: failed to bind to \"%s\"", - __func__, evcon->bind_address)); - return (-1); - } - - bufferevent_setfd(evcon->bufev, evcon->fd); - } else { - bufferevent_setfd(evcon->bufev, -1); - } - - /* Set up a callback for successful connection setup */ - bufferevent_setcb(evcon->bufev, - NULL /* evhttp_read_cb */, - NULL /* evhttp_write_cb */, - evhttp_connection_cb, - evcon); - if (!evutil_timerisset(&evcon->timeout)) { - const struct timeval conn_tv = { HTTP_CONNECT_TIMEOUT, 0 }; - bufferevent_set_timeouts(evcon->bufev, &conn_tv, &conn_tv); - } else { - bufferevent_set_timeouts(evcon->bufev, &evcon->timeout, &evcon->timeout); - } - /* make sure that we get a write callback */ - bufferevent_enable(evcon->bufev, EV_WRITE); - - evcon->state = EVCON_CONNECTING; - - if (evcon->flags & EVHTTP_CON_REUSE_CONNECTED_ADDR && - sa && - (sa->sa_family == AF_INET || sa->sa_family == AF_INET6)) { - int socklen = sizeof(struct sockaddr_in); - if (sa->sa_family == AF_INET6) { - socklen = sizeof(struct sockaddr_in6); - } - ret = bufferevent_socket_connect(evcon->bufev, sa, socklen); - } else { - ret = bufferevent_socket_connect_hostname(evcon->bufev, - evcon->dns_base, evcon->ai_family, address, evcon->port); - } - - if (ret < 0) { - evcon->state = old_state; - event_sock_warn(evcon->fd, "%s: connection to \"%s\" failed", - __func__, evcon->address); - /* some operating systems return ECONNREFUSED immediately - * when connecting to a local address. the cleanup is going - * to reschedule this function call. - */ - evhttp_connection_cb_cleanup(evcon); - return (0); - } - - return (0); -} - -/* - * Starts an HTTP request on the provided evhttp_connection object. - * If the connection object is not connected to the web server already, - * this will start the connection. - */ - -int -evhttp_make_request(struct evhttp_connection *evcon, - struct evhttp_request *req, - enum evhttp_cmd_type type, const char *uri) -{ - /* We are making a request */ - req->kind = EVHTTP_REQUEST; - req->type = type; - if (req->uri != NULL) - mm_free(req->uri); - if ((req->uri = mm_strdup(uri)) == NULL) { - event_warn("%s: strdup", __func__); - evhttp_request_free_auto(req); - return (-1); - } - - /* Set the protocol version if it is not supplied */ - if (!req->major && !req->minor) { - req->major = 1; - req->minor = 1; - } - - EVUTIL_ASSERT(req->evcon == NULL); - req->evcon = evcon; - EVUTIL_ASSERT(!(req->flags & EVHTTP_REQ_OWN_CONNECTION)); - - TAILQ_INSERT_TAIL(&evcon->requests, req, next); - - /* If the connection object is not connected; make it so */ - if (!evhttp_connected(evcon)) { - int res = evhttp_connection_connect_(evcon); - /* evhttp_connection_fail_(), which is called through - * evhttp_connection_connect_(), assumes that req lies in - * evcon->requests. Thus, enqueue the request in advance and - * remove it in the error case. */ - if (res != 0) - TAILQ_REMOVE(&evcon->requests, req, next); - - return res; - } - - /* - * If it's connected already and we are the first in the queue, - * then we can dispatch this request immediately. Otherwise, it - * will be dispatched once the pending requests are completed. - */ - if (TAILQ_FIRST(&evcon->requests) == req) - evhttp_request_dispatch(evcon); - - return (0); -} - -void -evhttp_cancel_request(struct evhttp_request *req) -{ - struct evhttp_connection *evcon = req->evcon; - if (evcon != NULL) { - /* We need to remove it from the connection */ - if (TAILQ_FIRST(&evcon->requests) == req) { - /* it's currently being worked on, so reset - * the connection. - */ - evhttp_connection_fail_(evcon, - EVREQ_HTTP_REQUEST_CANCEL); - - /* connection fail freed the request */ - return; - } else { - /* otherwise, we can just remove it from the - * queue - */ - TAILQ_REMOVE(&evcon->requests, req, next); - } - } - - evhttp_request_free_auto(req); -} - -/* - * Reads data from file descriptor into request structure - * Request structure needs to be set up correctly. - */ - -void -evhttp_start_read_(struct evhttp_connection *evcon) -{ - bufferevent_disable(evcon->bufev, EV_WRITE); - bufferevent_enable(evcon->bufev, EV_READ); - - evcon->state = EVCON_READING_FIRSTLINE; - /* Reset the bufferevent callbacks */ - bufferevent_setcb(evcon->bufev, - evhttp_read_cb, - evhttp_write_cb, - evhttp_error_cb, - evcon); - - /* If there's still data pending, process it next time through the - * loop. Don't do it now; that could get recusive. */ - if (evbuffer_get_length(bufferevent_get_input(evcon->bufev))) { - event_deferred_cb_schedule_(get_deferred_queue(evcon), - &evcon->read_more_deferred_cb); - } -} - -static void -evhttp_send_done(struct evhttp_connection *evcon, void *arg) -{ - int need_close; - struct evhttp_request *req = TAILQ_FIRST(&evcon->requests); - TAILQ_REMOVE(&evcon->requests, req, next); - - if (req->on_complete_cb != NULL) { - req->on_complete_cb(req, req->on_complete_cb_arg); - } - - need_close = - (REQ_VERSION_BEFORE(req, 1, 1) && - !evhttp_is_connection_keepalive(req->input_headers)) || - evhttp_is_request_connection_close(req); - - EVUTIL_ASSERT(req->flags & EVHTTP_REQ_OWN_CONNECTION); - evhttp_request_free(req); - - if (need_close) { - evhttp_connection_free(evcon); - return; - } - - /* we have a persistent connection; try to accept another request. */ - if (evhttp_associate_new_request_with_connection(evcon) == -1) { - evhttp_connection_free(evcon); - } -} - -/* - * Returns an error page. - */ - -void -evhttp_send_error(struct evhttp_request *req, int error, const char *reason) -{ - -#define ERR_FORMAT "<HTML><HEAD>\n" \ - "<TITLE>%d %s</TITLE>\n" \ - "</HEAD><BODY>\n" \ - "<H1>%s</H1>\n" \ - "</BODY></HTML>\n" - - struct evbuffer *buf = evbuffer_new(); - if (buf == NULL) { - /* if we cannot allocate memory; we just drop the connection */ - evhttp_connection_free(req->evcon); - return; - } - if (reason == NULL) { - reason = evhttp_response_phrase_internal(error); - } - - evhttp_response_code_(req, error, reason); - - evbuffer_add_printf(buf, ERR_FORMAT, error, reason, reason); - - evhttp_send_page_(req, buf); - - evbuffer_free(buf); -#undef ERR_FORMAT -} - -/* Requires that headers and response code are already set up */ - -static inline void -evhttp_send(struct evhttp_request *req, struct evbuffer *databuf) -{ - struct evhttp_connection *evcon = req->evcon; - - if (evcon == NULL) { - evhttp_request_free(req); - return; - } - - EVUTIL_ASSERT(TAILQ_FIRST(&evcon->requests) == req); - - /* we expect no more calls form the user on this request */ - req->userdone = 1; - - /* xxx: not sure if we really should expose the data buffer this way */ - if (databuf != NULL) - evbuffer_add_buffer(req->output_buffer, databuf); - - /* Adds headers to the response */ - evhttp_make_header(evcon, req); - - evhttp_write_buffer(evcon, evhttp_send_done, NULL); -} - -void -evhttp_send_reply(struct evhttp_request *req, int code, const char *reason, - struct evbuffer *databuf) -{ - evhttp_response_code_(req, code, reason); - - evhttp_send(req, databuf); -} - -void -evhttp_send_reply_start(struct evhttp_request *req, int code, - const char *reason) -{ - evhttp_response_code_(req, code, reason); - if (evhttp_find_header(req->output_headers, "Content-Length") == NULL && - REQ_VERSION_ATLEAST(req, 1, 1) && - evhttp_response_needs_body(req)) { - /* - * prefer HTTP/1.1 chunked encoding to closing the connection; - * note RFC 2616 section 4.4 forbids it with Content-Length: - * and it's not necessary then anyway. - */ - evhttp_add_header(req->output_headers, "Transfer-Encoding", - "chunked"); - req->chunked = 1; - } else { - req->chunked = 0; - } - evhttp_make_header(req->evcon, req); - evhttp_write_buffer(req->evcon, NULL, NULL); -} - -void -evhttp_send_reply_chunk_with_cb(struct evhttp_request *req, struct evbuffer *databuf, - void (*cb)(struct evhttp_connection *, void *), void *arg) -{ - struct evhttp_connection *evcon = req->evcon; - struct evbuffer *output; - - if (evcon == NULL) - return; - - output = bufferevent_get_output(evcon->bufev); - - if (evbuffer_get_length(databuf) == 0) - return; - if (!evhttp_response_needs_body(req)) - return; - if (req->chunked) { - evbuffer_add_printf(output, "%x\r\n", - (unsigned)evbuffer_get_length(databuf)); - } - evbuffer_add_buffer(output, databuf); - if (req->chunked) { - evbuffer_add(output, "\r\n", 2); - } - evhttp_write_buffer(evcon, cb, arg); -} - -void -evhttp_send_reply_chunk(struct evhttp_request *req, struct evbuffer *databuf) -{ - evhttp_send_reply_chunk_with_cb(req, databuf, NULL, NULL); -} -void -evhttp_send_reply_end(struct evhttp_request *req) -{ - struct evhttp_connection *evcon = req->evcon; - struct evbuffer *output; - - if (evcon == NULL) { - evhttp_request_free(req); - return; - } - - output = bufferevent_get_output(evcon->bufev); - - /* we expect no more calls form the user on this request */ - req->userdone = 1; - - if (req->chunked) { - evbuffer_add(output, "0\r\n\r\n", 5); - evhttp_write_buffer(req->evcon, evhttp_send_done, NULL); - req->chunked = 0; - } else if (evbuffer_get_length(output) == 0) { - /* let the connection know that we are done with the request */ - evhttp_send_done(evcon, NULL); - } else { - /* make the callback execute after all data has been written */ - evcon->cb = evhttp_send_done; - evcon->cb_arg = NULL; - } -} - -static const char *informational_phrases[] = { - /* 100 */ "Continue", - /* 101 */ "Switching Protocols" -}; - -static const char *success_phrases[] = { - /* 200 */ "OK", - /* 201 */ "Created", - /* 202 */ "Accepted", - /* 203 */ "Non-Authoritative Information", - /* 204 */ "No Content", - /* 205 */ "Reset Content", - /* 206 */ "Partial Content" -}; - -static const char *redirection_phrases[] = { - /* 300 */ "Multiple Choices", - /* 301 */ "Moved Permanently", - /* 302 */ "Found", - /* 303 */ "See Other", - /* 304 */ "Not Modified", - /* 305 */ "Use Proxy", - /* 307 */ "Temporary Redirect" -}; - -static const char *client_error_phrases[] = { - /* 400 */ "Bad Request", - /* 401 */ "Unauthorized", - /* 402 */ "Payment Required", - /* 403 */ "Forbidden", - /* 404 */ "Not Found", - /* 405 */ "Method Not Allowed", - /* 406 */ "Not Acceptable", - /* 407 */ "Proxy Authentication Required", - /* 408 */ "Request Time-out", - /* 409 */ "Conflict", - /* 410 */ "Gone", - /* 411 */ "Length Required", - /* 412 */ "Precondition Failed", - /* 413 */ "Request Entity Too Large", - /* 414 */ "Request-URI Too Large", - /* 415 */ "Unsupported Media Type", - /* 416 */ "Requested range not satisfiable", - /* 417 */ "Expectation Failed" -}; - -static const char *server_error_phrases[] = { - /* 500 */ "Internal Server Error", - /* 501 */ "Not Implemented", - /* 502 */ "Bad Gateway", - /* 503 */ "Service Unavailable", - /* 504 */ "Gateway Time-out", - /* 505 */ "HTTP Version not supported" -}; - -struct response_class { - const char *name; - size_t num_responses; - const char **responses; -}; - -#ifndef MEMBERSOF -#define MEMBERSOF(x) (sizeof(x)/sizeof(x[0])) -#endif - -static const struct response_class response_classes[] = { - /* 1xx */ { "Informational", MEMBERSOF(informational_phrases), informational_phrases }, - /* 2xx */ { "Success", MEMBERSOF(success_phrases), success_phrases }, - /* 3xx */ { "Redirection", MEMBERSOF(redirection_phrases), redirection_phrases }, - /* 4xx */ { "Client Error", MEMBERSOF(client_error_phrases), client_error_phrases }, - /* 5xx */ { "Server Error", MEMBERSOF(server_error_phrases), server_error_phrases } -}; - -static const char * -evhttp_response_phrase_internal(int code) -{ - int klass = code / 100 - 1; - int subcode = code % 100; - - /* Unknown class - can't do any better here */ - if (klass < 0 || klass >= (int) MEMBERSOF(response_classes)) - return "Unknown Status Class"; - - /* Unknown sub-code, return class name at least */ - if (subcode >= (int) response_classes[klass].num_responses) - return response_classes[klass].name; - - return response_classes[klass].responses[subcode]; -} - -void -evhttp_response_code_(struct evhttp_request *req, int code, const char *reason) -{ - req->kind = EVHTTP_RESPONSE; - req->response_code = code; - if (req->response_code_line != NULL) - mm_free(req->response_code_line); - if (reason == NULL) - reason = evhttp_response_phrase_internal(code); - req->response_code_line = mm_strdup(reason); - if (req->response_code_line == NULL) { - event_warn("%s: strdup", __func__); - /* XXX what else can we do? */ - } -} - -void -evhttp_send_page_(struct evhttp_request *req, struct evbuffer *databuf) -{ - if (!req->major || !req->minor) { - req->major = 1; - req->minor = 1; - } - - if (req->kind != EVHTTP_RESPONSE) - evhttp_response_code_(req, 200, "OK"); - - evhttp_clear_headers(req->output_headers); - evhttp_add_header(req->output_headers, "Content-Type", "text/html"); - evhttp_add_header(req->output_headers, "Connection", "close"); - - evhttp_send(req, databuf); -} - -static const char uri_chars[256] = { - /* 0 */ - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 1, 1, 0, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 0, 0, - /* 64 */ - 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 0, 1, - 0, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, - 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 1, 0, 0, 0, 1, 0, - /* 128 */ - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - /* 192 */ - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, - 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, 0, -}; - -#define CHAR_IS_UNRESERVED(c) \ - (uri_chars[(unsigned char)(c)]) - -/* - * Helper functions to encode/decode a string for inclusion in a URI. - * The returned string must be freed by the caller. - */ -char * -evhttp_uriencode(const char *uri, ev_ssize_t len, int space_as_plus) -{ - struct evbuffer *buf = evbuffer_new(); - const char *p, *end; - char *result; - - if (buf == NULL) - return (NULL); - - if (len >= 0) - end = uri+len; - else - end = uri+strlen(uri); - - for (p = uri; p < end; p++) { - if (CHAR_IS_UNRESERVED(*p)) { - evbuffer_add(buf, p, 1); - } else if (*p == ' ' && space_as_plus) { - evbuffer_add(buf, "+", 1); - } else { - evbuffer_add_printf(buf, "%%%02X", (unsigned char)(*p)); - } - } - evbuffer_add(buf, "", 1); /* NUL-terminator. */ - result = mm_malloc(evbuffer_get_length(buf)); - if (result) - evbuffer_remove(buf, result, evbuffer_get_length(buf)); - evbuffer_free(buf); - - return (result); -} - -char * -evhttp_encode_uri(const char *str) -{ - return evhttp_uriencode(str, -1, 0); -} - -/* - * @param decode_plus_ctl: if 1, we decode plus into space. If 0, we don't. - * If -1, when true we transform plus to space only after we've seen - * a ?. -1 is deprecated. - * @return the number of bytes written to 'ret'. - */ -int -evhttp_decode_uri_internal( - const char *uri, size_t length, char *ret, int decode_plus_ctl) -{ - char c; - int j; - int decode_plus = (decode_plus_ctl == 1) ? 1: 0; - unsigned i; - - for (i = j = 0; i < length; i++) { - c = uri[i]; - if (c == '?') { - if (decode_plus_ctl < 0) - decode_plus = 1; - } else if (c == '+' && decode_plus) { - c = ' '; - } else if ((i + 2) < length && c == '%' && - EVUTIL_ISXDIGIT_(uri[i+1]) && EVUTIL_ISXDIGIT_(uri[i+2])) { - char tmp[3]; - tmp[0] = uri[i+1]; - tmp[1] = uri[i+2]; - tmp[2] = '\0'; - c = (char)strtol(tmp, NULL, 16); - i += 2; - } - ret[j++] = c; - } - ret[j] = '\0'; - - return (j); -} - -/* deprecated */ -char * -evhttp_decode_uri(const char *uri) -{ - char *ret; - - if ((ret = mm_malloc(strlen(uri) + 1)) == NULL) { - event_warn("%s: malloc(%lu)", __func__, - (unsigned long)(strlen(uri) + 1)); - return (NULL); - } - - evhttp_decode_uri_internal(uri, strlen(uri), - ret, -1 /*always_decode_plus*/); - - return (ret); -} - -char * -evhttp_uridecode(const char *uri, int decode_plus, size_t *size_out) -{ - char *ret; - int n; - - if ((ret = mm_malloc(strlen(uri) + 1)) == NULL) { - event_warn("%s: malloc(%lu)", __func__, - (unsigned long)(strlen(uri) + 1)); - return (NULL); - } - - n = evhttp_decode_uri_internal(uri, strlen(uri), - ret, !!decode_plus/*always_decode_plus*/); - - if (size_out) { - EVUTIL_ASSERT(n >= 0); - *size_out = (size_t)n; - } - - return (ret); -} - -/* - * Helper function to parse out arguments in a query. - * The arguments are separated by key and value. - */ - -static int -evhttp_parse_query_impl(const char *str, struct evkeyvalq *headers, - int is_whole_uri) -{ - char *line=NULL; - char *argument; - char *p; - const char *query_part; - int result = -1; - struct evhttp_uri *uri=NULL; - - TAILQ_INIT(headers); - - if (is_whole_uri) { - uri = evhttp_uri_parse(str); - if (!uri) - goto error; - query_part = evhttp_uri_get_query(uri); - } else { - query_part = str; - } - - /* No arguments - we are done */ - if (!query_part || !strlen(query_part)) { - result = 0; - goto done; - } - - if ((line = mm_strdup(query_part)) == NULL) { - event_warn("%s: strdup", __func__); - goto error; - } - - p = argument = line; - while (p != NULL && *p != '\0') { - char *key, *value, *decoded_value; - argument = strsep(&p, "&"); - - value = argument; - key = strsep(&value, "="); - if (value == NULL || *key == '\0') { - goto error; - } - - if ((decoded_value = mm_malloc(strlen(value) + 1)) == NULL) { - event_warn("%s: mm_malloc", __func__); - goto error; - } - evhttp_decode_uri_internal(value, strlen(value), - decoded_value, 1 /*always_decode_plus*/); - event_debug(("Query Param: %s -> %s\n", key, decoded_value)); - evhttp_add_header_internal(headers, key, decoded_value); - mm_free(decoded_value); - } - - result = 0; - goto done; -error: - evhttp_clear_headers(headers); -done: - if (line) - mm_free(line); - if (uri) - evhttp_uri_free(uri); - return result; -} - -int -evhttp_parse_query(const char *uri, struct evkeyvalq *headers) -{ - return evhttp_parse_query_impl(uri, headers, 1); -} -int -evhttp_parse_query_str(const char *uri, struct evkeyvalq *headers) -{ - return evhttp_parse_query_impl(uri, headers, 0); -} - -static struct evhttp_cb * -evhttp_dispatch_callback(struct httpcbq *callbacks, struct evhttp_request *req) -{ - struct evhttp_cb *cb; - size_t offset = 0; - char *translated; - const char *path; - - /* Test for different URLs */ - path = evhttp_uri_get_path(req->uri_elems); - offset = strlen(path); - if ((translated = mm_malloc(offset + 1)) == NULL) - return (NULL); - evhttp_decode_uri_internal(path, offset, translated, - 0 /* decode_plus */); - - TAILQ_FOREACH(cb, callbacks, next) { - if (!strcmp(cb->what, translated)) { - mm_free(translated); - return (cb); - } - } - - mm_free(translated); - return (NULL); -} - - -static int -prefix_suffix_match(const char *pattern, const char *name, int ignorecase) -{ - char c; - - while (1) { - switch (c = *pattern++) { - case '\0': - return *name == '\0'; - - case '*': - while (*name != '\0') { - if (prefix_suffix_match(pattern, name, - ignorecase)) - return (1); - ++name; - } - return (0); - default: - if (c != *name) { - if (!ignorecase || - EVUTIL_TOLOWER_(c) != EVUTIL_TOLOWER_(*name)) - return (0); - } - ++name; - } - } - /* NOTREACHED */ -} - -/* - Search the vhost hierarchy beginning with http for a server alias - matching hostname. If a match is found, and outhttp is non-null, - outhttp is set to the matching http object and 1 is returned. -*/ - -static int -evhttp_find_alias(struct evhttp *http, struct evhttp **outhttp, - const char *hostname) -{ - struct evhttp_server_alias *alias; - struct evhttp *vhost; - - TAILQ_FOREACH(alias, &http->aliases, next) { - /* XXX Do we need to handle IP addresses? */ - if (!evutil_ascii_strcasecmp(alias->alias, hostname)) { - if (outhttp) - *outhttp = http; - return 1; - } - } - - /* XXX It might be good to avoid recursion here, but I don't - see a way to do that w/o a list. */ - TAILQ_FOREACH(vhost, &http->virtualhosts, next_vhost) { - if (evhttp_find_alias(vhost, outhttp, hostname)) - return 1; - } - - return 0; -} - -/* - Attempts to find the best http object to handle a request for a hostname. - All aliases for the root http object and vhosts are searched for an exact - match. Then, the vhost hierarchy is traversed again for a matching - pattern. - - If an alias or vhost is matched, 1 is returned, and outhttp, if non-null, - is set with the best matching http object. If there are no matches, the - root http object is stored in outhttp and 0 is returned. -*/ - -static int -evhttp_find_vhost(struct evhttp *http, struct evhttp **outhttp, - const char *hostname) -{ - struct evhttp *vhost; - struct evhttp *oldhttp; - int match_found = 0; - - if (evhttp_find_alias(http, outhttp, hostname)) - return 1; - - do { - oldhttp = http; - TAILQ_FOREACH(vhost, &http->virtualhosts, next_vhost) { - if (prefix_suffix_match(vhost->vhost_pattern, - hostname, 1 /* ignorecase */)) { - http = vhost; - match_found = 1; - break; - } - } - } while (oldhttp != http); - - if (outhttp) - *outhttp = http; - - return match_found; -} - -static void -evhttp_handle_request(struct evhttp_request *req, void *arg) -{ - struct evhttp *http = arg; - struct evhttp_cb *cb = NULL; - const char *hostname; - - /* we have a new request on which the user needs to take action */ - req->userdone = 0; - - if (req->type == 0 || req->uri == NULL) { - evhttp_send_error(req, HTTP_BADREQUEST, NULL); - return; - } - - if ((http->allowed_methods & req->type) == 0) { - event_debug(("Rejecting disallowed method %x (allowed: %x)\n", - (unsigned)req->type, (unsigned)http->allowed_methods)); - evhttp_send_error(req, HTTP_NOTIMPLEMENTED, NULL); - return; - } - - /* handle potential virtual hosts */ - hostname = evhttp_request_get_host(req); - if (hostname != NULL) { - evhttp_find_vhost(http, &http, hostname); - } - - if ((cb = evhttp_dispatch_callback(&http->callbacks, req)) != NULL) { - (*cb->cb)(req, cb->cbarg); - return; - } - - /* Generic call back */ - if (http->gencb) { - (*http->gencb)(req, http->gencbarg); - return; - } else { - /* We need to send a 404 here */ -#define ERR_FORMAT "<html><head>" \ - "<title>404 Not Found</title>" \ - "</head><body>" \ - "<h1>Not Found</h1>" \ - "<p>The requested URL %s was not found on this server.</p>"\ - "</body></html>\n" - - char *escaped_html; - struct evbuffer *buf; - - if ((escaped_html = evhttp_htmlescape(req->uri)) == NULL) { - evhttp_connection_free(req->evcon); - return; - } - - if ((buf = evbuffer_new()) == NULL) { - mm_free(escaped_html); - evhttp_connection_free(req->evcon); - return; - } - - evhttp_response_code_(req, HTTP_NOTFOUND, "Not Found"); - - evbuffer_add_printf(buf, ERR_FORMAT, escaped_html); - - mm_free(escaped_html); - - evhttp_send_page_(req, buf); - - evbuffer_free(buf); -#undef ERR_FORMAT - } -} - -/* Listener callback when a connection arrives at a server. */ -static void -accept_socket_cb(struct evconnlistener *listener, evutil_socket_t nfd, struct sockaddr *peer_sa, int peer_socklen, void *arg) -{ - struct evhttp *http = arg; - - evhttp_get_request(http, nfd, peer_sa, peer_socklen); -} - -int -evhttp_bind_socket(struct evhttp *http, const char *address, ev_uint16_t port) -{ - struct evhttp_bound_socket *bound = - evhttp_bind_socket_with_handle(http, address, port); - if (bound == NULL) - return (-1); - return (0); -} - -struct evhttp_bound_socket * -evhttp_bind_socket_with_handle(struct evhttp *http, const char *address, ev_uint16_t port) -{ - evutil_socket_t fd; - struct evhttp_bound_socket *bound; - - if ((fd = bind_socket(address, port, 1 /*reuse*/)) == -1) - return (NULL); - - if (listen(fd, 128) == -1) { - event_sock_warn(fd, "%s: listen", __func__); - evutil_closesocket(fd); - return (NULL); - } - - bound = evhttp_accept_socket_with_handle(http, fd); - - if (bound != NULL) { - event_debug(("Bound to port %d - Awaiting connections ... ", - port)); - return (bound); - } - - return (NULL); -} - -int -evhttp_accept_socket(struct evhttp *http, evutil_socket_t fd) -{ - struct evhttp_bound_socket *bound = - evhttp_accept_socket_with_handle(http, fd); - if (bound == NULL) - return (-1); - return (0); -} - -void -evhttp_foreach_bound_socket(struct evhttp *http, - evhttp_bound_socket_foreach_fn *function, - void *argument) -{ - struct evhttp_bound_socket *bound; - - TAILQ_FOREACH(bound, &http->sockets, next) - function(bound, argument); -} - -struct evhttp_bound_socket * -evhttp_accept_socket_with_handle(struct evhttp *http, evutil_socket_t fd) -{ - struct evhttp_bound_socket *bound; - struct evconnlistener *listener; - const int flags = - LEV_OPT_REUSEABLE|LEV_OPT_CLOSE_ON_EXEC|LEV_OPT_CLOSE_ON_FREE; - - listener = evconnlistener_new(http->base, NULL, NULL, - flags, - 0, /* Backlog is '0' because we already said 'listen' */ - fd); - if (!listener) - return (NULL); - - bound = evhttp_bind_listener(http, listener); - if (!bound) { - evconnlistener_free(listener); - return (NULL); - } - return (bound); -} - -struct evhttp_bound_socket * -evhttp_bind_listener(struct evhttp *http, struct evconnlistener *listener) -{ - struct evhttp_bound_socket *bound; - - bound = mm_malloc(sizeof(struct evhttp_bound_socket)); - if (bound == NULL) - return (NULL); - - bound->listener = listener; - TAILQ_INSERT_TAIL(&http->sockets, bound, next); - - evconnlistener_set_cb(listener, accept_socket_cb, http); - return bound; -} - -evutil_socket_t -evhttp_bound_socket_get_fd(struct evhttp_bound_socket *bound) -{ - return evconnlistener_get_fd(bound->listener); -} - -struct evconnlistener * -evhttp_bound_socket_get_listener(struct evhttp_bound_socket *bound) -{ - return bound->listener; -} - -void -evhttp_del_accept_socket(struct evhttp *http, struct evhttp_bound_socket *bound) -{ - TAILQ_REMOVE(&http->sockets, bound, next); - evconnlistener_free(bound->listener); - mm_free(bound); -} - -static struct evhttp* -evhttp_new_object(void) -{ - struct evhttp *http = NULL; - - if ((http = mm_calloc(1, sizeof(struct evhttp))) == NULL) { - event_warn("%s: calloc", __func__); - return (NULL); - } - - evutil_timerclear(&http->timeout); - evhttp_set_max_headers_size(http, EV_SIZE_MAX); - evhttp_set_max_body_size(http, EV_SIZE_MAX); - evhttp_set_default_content_type(http, "text/html; charset=ISO-8859-1"); - evhttp_set_allowed_methods(http, - EVHTTP_REQ_GET | - EVHTTP_REQ_POST | - EVHTTP_REQ_HEAD | - EVHTTP_REQ_PUT | - EVHTTP_REQ_DELETE); - - TAILQ_INIT(&http->sockets); - TAILQ_INIT(&http->callbacks); - TAILQ_INIT(&http->connections); - TAILQ_INIT(&http->virtualhosts); - TAILQ_INIT(&http->aliases); - - return (http); -} - -struct evhttp * -evhttp_new(struct event_base *base) -{ - struct evhttp *http = NULL; - - http = evhttp_new_object(); - if (http == NULL) - return (NULL); - http->base = base; - - return (http); -} - -/* - * Start a web server on the specified address and port. - */ - -struct evhttp * -evhttp_start(const char *address, unsigned short port) -{ - struct evhttp *http = NULL; - - http = evhttp_new_object(); - if (http == NULL) - return (NULL); - if (evhttp_bind_socket(http, address, port) == -1) { - mm_free(http); - return (NULL); - } - - return (http); -} - -void -evhttp_free(struct evhttp* http) -{ - struct evhttp_cb *http_cb; - struct evhttp_connection *evcon; - struct evhttp_bound_socket *bound; - struct evhttp* vhost; - struct evhttp_server_alias *alias; - - /* Remove the accepting part */ - while ((bound = TAILQ_FIRST(&http->sockets)) != NULL) { - TAILQ_REMOVE(&http->sockets, bound, next); - - evconnlistener_free(bound->listener); - - mm_free(bound); - } - - while ((evcon = TAILQ_FIRST(&http->connections)) != NULL) { - /* evhttp_connection_free removes the connection */ - evhttp_connection_free(evcon); - } - - while ((http_cb = TAILQ_FIRST(&http->callbacks)) != NULL) { - TAILQ_REMOVE(&http->callbacks, http_cb, next); - mm_free(http_cb->what); - mm_free(http_cb); - } - - while ((vhost = TAILQ_FIRST(&http->virtualhosts)) != NULL) { - TAILQ_REMOVE(&http->virtualhosts, vhost, next_vhost); - - evhttp_free(vhost); - } - - if (http->vhost_pattern != NULL) - mm_free(http->vhost_pattern); - - while ((alias = TAILQ_FIRST(&http->aliases)) != NULL) { - TAILQ_REMOVE(&http->aliases, alias, next); - mm_free(alias->alias); - mm_free(alias); - } - - mm_free(http); -} - -int -evhttp_add_virtual_host(struct evhttp* http, const char *pattern, - struct evhttp* vhost) -{ - /* a vhost can only be a vhost once and should not have bound sockets */ - if (vhost->vhost_pattern != NULL || - TAILQ_FIRST(&vhost->sockets) != NULL) - return (-1); - - vhost->vhost_pattern = mm_strdup(pattern); - if (vhost->vhost_pattern == NULL) - return (-1); - - TAILQ_INSERT_TAIL(&http->virtualhosts, vhost, next_vhost); - - return (0); -} - -int -evhttp_remove_virtual_host(struct evhttp* http, struct evhttp* vhost) -{ - if (vhost->vhost_pattern == NULL) - return (-1); - - TAILQ_REMOVE(&http->virtualhosts, vhost, next_vhost); - - mm_free(vhost->vhost_pattern); - vhost->vhost_pattern = NULL; - - return (0); -} - -int -evhttp_add_server_alias(struct evhttp *http, const char *alias) -{ - struct evhttp_server_alias *evalias; - - evalias = mm_calloc(1, sizeof(*evalias)); - if (!evalias) - return -1; - - evalias->alias = mm_strdup(alias); - if (!evalias->alias) { - mm_free(evalias); - return -1; - } - - TAILQ_INSERT_TAIL(&http->aliases, evalias, next); - - return 0; -} - -int -evhttp_remove_server_alias(struct evhttp *http, const char *alias) -{ - struct evhttp_server_alias *evalias; - - TAILQ_FOREACH(evalias, &http->aliases, next) { - if (evutil_ascii_strcasecmp(evalias->alias, alias) == 0) { - TAILQ_REMOVE(&http->aliases, evalias, next); - mm_free(evalias->alias); - mm_free(evalias); - return 0; - } - } - - return -1; -} - -void -evhttp_set_timeout(struct evhttp* http, int timeout_in_secs) -{ - if (timeout_in_secs == -1) { - evhttp_set_timeout_tv(http, NULL); - } else { - struct timeval tv; - tv.tv_sec = timeout_in_secs; - tv.tv_usec = 0; - evhttp_set_timeout_tv(http, &tv); - } -} - -void -evhttp_set_timeout_tv(struct evhttp* http, const struct timeval* tv) -{ - if (tv) { - http->timeout = *tv; - } else { - evutil_timerclear(&http->timeout); - } -} - -void -evhttp_set_max_headers_size(struct evhttp* http, ev_ssize_t max_headers_size) -{ - if (max_headers_size < 0) - http->default_max_headers_size = EV_SIZE_MAX; - else - http->default_max_headers_size = max_headers_size; -} - -void -evhttp_set_max_body_size(struct evhttp* http, ev_ssize_t max_body_size) -{ - if (max_body_size < 0) - http->default_max_body_size = EV_UINT64_MAX; - else - http->default_max_body_size = max_body_size; -} - -void -evhttp_set_default_content_type(struct evhttp *http, - const char *content_type) { - http->default_content_type = content_type; -} - -void -evhttp_set_allowed_methods(struct evhttp* http, ev_uint16_t methods) -{ - http->allowed_methods = methods; -} - -int -evhttp_set_cb(struct evhttp *http, const char *uri, - void (*cb)(struct evhttp_request *, void *), void *cbarg) -{ - struct evhttp_cb *http_cb; - - TAILQ_FOREACH(http_cb, &http->callbacks, next) { - if (strcmp(http_cb->what, uri) == 0) - return (-1); - } - - if ((http_cb = mm_calloc(1, sizeof(struct evhttp_cb))) == NULL) { - event_warn("%s: calloc", __func__); - return (-2); - } - - http_cb->what = mm_strdup(uri); - if (http_cb->what == NULL) { - event_warn("%s: strdup", __func__); - mm_free(http_cb); - return (-3); - } - http_cb->cb = cb; - http_cb->cbarg = cbarg; - - TAILQ_INSERT_TAIL(&http->callbacks, http_cb, next); - - return (0); -} - -int -evhttp_del_cb(struct evhttp *http, const char *uri) -{ - struct evhttp_cb *http_cb; - - TAILQ_FOREACH(http_cb, &http->callbacks, next) { - if (strcmp(http_cb->what, uri) == 0) - break; - } - if (http_cb == NULL) - return (-1); - - TAILQ_REMOVE(&http->callbacks, http_cb, next); - mm_free(http_cb->what); - mm_free(http_cb); - - return (0); -} - -void -evhttp_set_gencb(struct evhttp *http, - void (*cb)(struct evhttp_request *, void *), void *cbarg) -{ - http->gencb = cb; - http->gencbarg = cbarg; -} - -void -evhttp_set_bevcb(struct evhttp *http, - struct bufferevent* (*cb)(struct event_base *, void *), void *cbarg) -{ - http->bevcb = cb; - http->bevcbarg = cbarg; -} - -/* - * Request related functions - */ - -struct evhttp_request * -evhttp_request_new(void (*cb)(struct evhttp_request *, void *), void *arg) -{ - struct evhttp_request *req = NULL; - - /* Allocate request structure */ - if ((req = mm_calloc(1, sizeof(struct evhttp_request))) == NULL) { - event_warn("%s: calloc", __func__); - goto error; - } - - req->headers_size = 0; - req->body_size = 0; - - req->kind = EVHTTP_RESPONSE; - req->input_headers = mm_calloc(1, sizeof(struct evkeyvalq)); - if (req->input_headers == NULL) { - event_warn("%s: calloc", __func__); - goto error; - } - TAILQ_INIT(req->input_headers); - - req->output_headers = mm_calloc(1, sizeof(struct evkeyvalq)); - if (req->output_headers == NULL) { - event_warn("%s: calloc", __func__); - goto error; - } - TAILQ_INIT(req->output_headers); - - if ((req->input_buffer = evbuffer_new()) == NULL) { - event_warn("%s: evbuffer_new", __func__); - goto error; - } - - if ((req->output_buffer = evbuffer_new()) == NULL) { - event_warn("%s: evbuffer_new", __func__); - goto error; - } - - req->cb = cb; - req->cb_arg = arg; - - return (req); - - error: - if (req != NULL) - evhttp_request_free(req); - return (NULL); -} - -void -evhttp_request_free(struct evhttp_request *req) -{ - if ((req->flags & EVHTTP_REQ_DEFER_FREE) != 0) { - req->flags |= EVHTTP_REQ_NEEDS_FREE; - return; - } - - if (req->remote_host != NULL) - mm_free(req->remote_host); - if (req->uri != NULL) - mm_free(req->uri); - if (req->uri_elems != NULL) - evhttp_uri_free(req->uri_elems); - if (req->response_code_line != NULL) - mm_free(req->response_code_line); - if (req->host_cache != NULL) - mm_free(req->host_cache); - - evhttp_clear_headers(req->input_headers); - mm_free(req->input_headers); - - evhttp_clear_headers(req->output_headers); - mm_free(req->output_headers); - - if (req->input_buffer != NULL) - evbuffer_free(req->input_buffer); - - if (req->output_buffer != NULL) - evbuffer_free(req->output_buffer); - - mm_free(req); -} - -void -evhttp_request_own(struct evhttp_request *req) -{ - req->flags |= EVHTTP_USER_OWNED; -} - -int -evhttp_request_is_owned(struct evhttp_request *req) -{ - return (req->flags & EVHTTP_USER_OWNED) != 0; -} - -struct evhttp_connection * -evhttp_request_get_connection(struct evhttp_request *req) -{ - return req->evcon; -} - -struct event_base * -evhttp_connection_get_base(struct evhttp_connection *conn) -{ - return conn->base; -} - -void -evhttp_request_set_chunked_cb(struct evhttp_request *req, - void (*cb)(struct evhttp_request *, void *)) -{ - req->chunk_cb = cb; -} - -void -evhttp_request_set_header_cb(struct evhttp_request *req, - int (*cb)(struct evhttp_request *, void *)) -{ - req->header_cb = cb; -} - -void -evhttp_request_set_error_cb(struct evhttp_request *req, - void (*cb)(enum evhttp_request_error, void *)) -{ - req->error_cb = cb; -} - -void -evhttp_request_set_on_complete_cb(struct evhttp_request *req, - void (*cb)(struct evhttp_request *, void *), void *cb_arg) -{ - req->on_complete_cb = cb; - req->on_complete_cb_arg = cb_arg; -} - -/* - * Allows for inspection of the request URI - */ - -const char * -evhttp_request_get_uri(const struct evhttp_request *req) { - if (req->uri == NULL) - event_debug(("%s: request %p has no uri\n", __func__, req)); - return (req->uri); -} - -const struct evhttp_uri * -evhttp_request_get_evhttp_uri(const struct evhttp_request *req) { - if (req->uri_elems == NULL) - event_debug(("%s: request %p has no uri elems\n", - __func__, req)); - return (req->uri_elems); -} - -const char * -evhttp_request_get_host(struct evhttp_request *req) -{ - const char *host = NULL; - - if (req->host_cache) - return req->host_cache; - - if (req->uri_elems) - host = evhttp_uri_get_host(req->uri_elems); - if (!host && req->input_headers) { - const char *p; - size_t len; - - host = evhttp_find_header(req->input_headers, "Host"); - /* The Host: header may include a port. Remove it here - to be consistent with uri_elems case above. */ - if (host) { - p = host + strlen(host) - 1; - while (p > host && EVUTIL_ISDIGIT_(*p)) - --p; - if (p > host && *p == ':') { - len = p - host; - req->host_cache = mm_malloc(len + 1); - if (!req->host_cache) { - event_warn("%s: malloc", __func__); - return NULL; - } - memcpy(req->host_cache, host, len); - req->host_cache[len] = '\0'; - host = req->host_cache; - } - } - } - - return host; -} - -enum evhttp_cmd_type -evhttp_request_get_command(const struct evhttp_request *req) { - return (req->type); -} - -int -evhttp_request_get_response_code(const struct evhttp_request *req) -{ - return req->response_code; -} - -const char * -evhttp_request_get_response_code_line(const struct evhttp_request *req) -{ - return req->response_code_line; -} - -/** Returns the input headers */ -struct evkeyvalq *evhttp_request_get_input_headers(struct evhttp_request *req) -{ - return (req->input_headers); -} - -/** Returns the output headers */ -struct evkeyvalq *evhttp_request_get_output_headers(struct evhttp_request *req) -{ - return (req->output_headers); -} - -/** Returns the input buffer */ -struct evbuffer *evhttp_request_get_input_buffer(struct evhttp_request *req) -{ - return (req->input_buffer); -} - -/** Returns the output buffer */ -struct evbuffer *evhttp_request_get_output_buffer(struct evhttp_request *req) -{ - return (req->output_buffer); -} - - -/* - * Takes a file descriptor to read a request from. - * The callback is executed once the whole request has been read. - */ - -static struct evhttp_connection* -evhttp_get_request_connection( - struct evhttp* http, - evutil_socket_t fd, struct sockaddr *sa, ev_socklen_t salen) -{ - struct evhttp_connection *evcon; - char *hostname = NULL, *portname = NULL; - struct bufferevent* bev = NULL; - - name_from_addr(sa, salen, &hostname, &portname); - if (hostname == NULL || portname == NULL) { - if (hostname) mm_free(hostname); - if (portname) mm_free(portname); - return (NULL); - } - - event_debug(("%s: new request from %s:%s on "EV_SOCK_FMT"\n", - __func__, hostname, portname, EV_SOCK_ARG(fd))); - - /* we need a connection object to put the http request on */ - if (http->bevcb != NULL) { - bev = (*http->bevcb)(http->base, http->bevcbarg); - } - evcon = evhttp_connection_base_bufferevent_new( - http->base, NULL, bev, hostname, atoi(portname)); - mm_free(hostname); - mm_free(portname); - if (evcon == NULL) - return (NULL); - - evcon->max_headers_size = http->default_max_headers_size; - evcon->max_body_size = http->default_max_body_size; - - evcon->flags |= EVHTTP_CON_INCOMING; - evcon->state = EVCON_READING_FIRSTLINE; - - evcon->fd = fd; - - bufferevent_enable(evcon->bufev, EV_READ); - bufferevent_disable(evcon->bufev, EV_WRITE); - bufferevent_setfd(evcon->bufev, fd); - - return (evcon); -} - -static int -evhttp_associate_new_request_with_connection(struct evhttp_connection *evcon) -{ - struct evhttp *http = evcon->http_server; - struct evhttp_request *req; - if ((req = evhttp_request_new(evhttp_handle_request, http)) == NULL) - return (-1); - - if ((req->remote_host = mm_strdup(evcon->address)) == NULL) { - event_warn("%s: strdup", __func__); - evhttp_request_free(req); - return (-1); - } - req->remote_port = evcon->port; - - req->evcon = evcon; /* the request ends up owning the connection */ - req->flags |= EVHTTP_REQ_OWN_CONNECTION; - - /* We did not present the request to the user user yet, so treat it as - * if the user was done with the request. This allows us to free the - * request on a persistent connection if the client drops it without - * sending a request. - */ - req->userdone = 1; - - TAILQ_INSERT_TAIL(&evcon->requests, req, next); - - req->kind = EVHTTP_REQUEST; - - - evhttp_start_read_(evcon); - - return (0); -} - -static void -evhttp_get_request(struct evhttp *http, evutil_socket_t fd, - struct sockaddr *sa, ev_socklen_t salen) -{ - struct evhttp_connection *evcon; - - evcon = evhttp_get_request_connection(http, fd, sa, salen); - if (evcon == NULL) { - event_sock_warn(fd, "%s: cannot get connection on "EV_SOCK_FMT, - __func__, EV_SOCK_ARG(fd)); - evutil_closesocket(fd); - return; - } - - /* the timeout can be used by the server to close idle connections */ - if (evutil_timerisset(&http->timeout)) - evhttp_connection_set_timeout_tv(evcon, &http->timeout); - - /* - * if we want to accept more than one request on a connection, - * we need to know which http server it belongs to. - */ - evcon->http_server = http; - TAILQ_INSERT_TAIL(&http->connections, evcon, next); - - if (evhttp_associate_new_request_with_connection(evcon) == -1) - evhttp_connection_free(evcon); -} - - -/* - * Network helper functions that we do not want to export to the rest of - * the world. - */ - -static void -name_from_addr(struct sockaddr *sa, ev_socklen_t salen, - char **phost, char **pport) -{ - char ntop[NI_MAXHOST]; - char strport[NI_MAXSERV]; - int ni_result; - -#ifdef EVENT__HAVE_GETNAMEINFO - ni_result = getnameinfo(sa, salen, - ntop, sizeof(ntop), strport, sizeof(strport), - NI_NUMERICHOST|NI_NUMERICSERV); - - if (ni_result != 0) { -#ifdef EAI_SYSTEM - /* Windows doesn't have an EAI_SYSTEM. */ - if (ni_result == EAI_SYSTEM) - event_err(1, "getnameinfo failed"); - else -#endif - event_errx(1, "getnameinfo failed: %s", gai_strerror(ni_result)); - return; - } -#else - ni_result = fake_getnameinfo(sa, salen, - ntop, sizeof(ntop), strport, sizeof(strport), - NI_NUMERICHOST|NI_NUMERICSERV); - if (ni_result != 0) - return; -#endif - - *phost = mm_strdup(ntop); - *pport = mm_strdup(strport); -} - -/* Create a non-blocking socket and bind it */ -/* todo: rename this function */ -static evutil_socket_t -bind_socket_ai(struct evutil_addrinfo *ai, int reuse) -{ - evutil_socket_t fd; - - int on = 1, r; - int serrno; - - /* Create listen socket */ - fd = evutil_socket_(ai ? ai->ai_family : AF_INET, - SOCK_STREAM|EVUTIL_SOCK_NONBLOCK|EVUTIL_SOCK_CLOEXEC, 0); - if (fd == -1) { - event_sock_warn(-1, "socket"); - return (-1); - } - - if (setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&on, sizeof(on))<0) - goto out; - if (reuse) { - if (evutil_make_listen_socket_reuseable(fd) < 0) - goto out; - } - - if (ai != NULL) { - r = bind(fd, ai->ai_addr, (ev_socklen_t)ai->ai_addrlen); - if (r == -1) - goto out; - } - - return (fd); - - out: - serrno = EVUTIL_SOCKET_ERROR(); - evutil_closesocket(fd); - EVUTIL_SET_SOCKET_ERROR(serrno); - return (-1); -} - -static struct evutil_addrinfo * -make_addrinfo(const char *address, ev_uint16_t port) -{ - struct evutil_addrinfo *ai = NULL; - - struct evutil_addrinfo hints; - char strport[NI_MAXSERV]; - int ai_result; - - memset(&hints, 0, sizeof(hints)); - hints.ai_family = AF_UNSPEC; - hints.ai_socktype = SOCK_STREAM; - /* turn NULL hostname into INADDR_ANY, and skip looking up any address - * types we don't have an interface to connect to. */ - hints.ai_flags = EVUTIL_AI_PASSIVE|EVUTIL_AI_ADDRCONFIG; - evutil_snprintf(strport, sizeof(strport), "%d", port); - if ((ai_result = evutil_getaddrinfo(address, strport, &hints, &ai)) - != 0) { - if (ai_result == EVUTIL_EAI_SYSTEM) - event_warn("getaddrinfo"); - else - event_warnx("getaddrinfo: %s", - evutil_gai_strerror(ai_result)); - return (NULL); - } - - return (ai); -} - -static evutil_socket_t -bind_socket(const char *address, ev_uint16_t port, int reuse) -{ - evutil_socket_t fd; - struct evutil_addrinfo *aitop = NULL; - - /* just create an unbound socket */ - if (address == NULL && port == 0) - return bind_socket_ai(NULL, 0); - - aitop = make_addrinfo(address, port); - - if (aitop == NULL) - return (-1); - - fd = bind_socket_ai(aitop, reuse); - - evutil_freeaddrinfo(aitop); - - return (fd); -} - -struct evhttp_uri { - unsigned flags; - char *scheme; /* scheme; e.g http, ftp etc */ - char *userinfo; /* userinfo (typically username:pass), or NULL */ - char *host; /* hostname, IP address, or NULL */ - int port; /* port, or zero */ - char *path; /* path, or "". */ - char *query; /* query, or NULL */ - char *fragment; /* fragment or NULL */ -}; - -struct evhttp_uri * -evhttp_uri_new(void) -{ - struct evhttp_uri *uri = mm_calloc(sizeof(struct evhttp_uri), 1); - if (uri) - uri->port = -1; - return uri; -} - -void -evhttp_uri_set_flags(struct evhttp_uri *uri, unsigned flags) -{ - uri->flags = flags; -} - -/* Return true if the string starting at s and ending immediately before eos - * is a valid URI scheme according to RFC3986 - */ -static int -scheme_ok(const char *s, const char *eos) -{ - /* scheme = ALPHA *( ALPHA / DIGIT / "+" / "-" / "." ) */ - EVUTIL_ASSERT(eos >= s); - if (s == eos) - return 0; - if (!EVUTIL_ISALPHA_(*s)) - return 0; - while (++s < eos) { - if (! EVUTIL_ISALNUM_(*s) && - *s != '+' && *s != '-' && *s != '.') - return 0; - } - return 1; -} - -#define SUBDELIMS "!$&'()*+,;=" - -/* Return true iff [s..eos) is a valid userinfo */ -static int -userinfo_ok(const char *s, const char *eos) -{ - while (s < eos) { - if (CHAR_IS_UNRESERVED(*s) || - strchr(SUBDELIMS, *s) || - *s == ':') - ++s; - else if (*s == '%' && s+2 < eos && - EVUTIL_ISXDIGIT_(s[1]) && - EVUTIL_ISXDIGIT_(s[2])) - s += 3; - else - return 0; - } - return 1; -} - -static int -regname_ok(const char *s, const char *eos) -{ - while (s && s<eos) { - if (CHAR_IS_UNRESERVED(*s) || - strchr(SUBDELIMS, *s)) - ++s; - else if (*s == '%' && - EVUTIL_ISXDIGIT_(s[1]) && - EVUTIL_ISXDIGIT_(s[2])) - s += 3; - else - return 0; - } - return 1; -} - -static int -parse_port(const char *s, const char *eos) -{ - int portnum = 0; - while (s < eos) { - if (! EVUTIL_ISDIGIT_(*s)) - return -1; - portnum = (portnum * 10) + (*s - '0'); - if (portnum < 0) - return -1; - if (portnum > 65535) - return -1; - ++s; - } - return portnum; -} - -/* returns 0 for bad, 1 for ipv6, 2 for IPvFuture */ -static int -bracket_addr_ok(const char *s, const char *eos) -{ - if (s + 3 > eos || *s != '[' || *(eos-1) != ']') - return 0; - if (s[1] == 'v') { - /* IPvFuture, or junk. - "v" 1*HEXDIG "." 1*( unreserved / sub-delims / ":" ) - */ - s += 2; /* skip [v */ - --eos; - if (!EVUTIL_ISXDIGIT_(*s)) /*require at least one*/ - return 0; - while (s < eos && *s != '.') { - if (EVUTIL_ISXDIGIT_(*s)) - ++s; - else - return 0; - } - if (*s != '.') - return 0; - ++s; - while (s < eos) { - if (CHAR_IS_UNRESERVED(*s) || - strchr(SUBDELIMS, *s) || - *s == ':') - ++s; - else - return 0; - } - return 2; - } else { - /* IPv6, or junk */ - char buf[64]; - ev_ssize_t n_chars = eos-s-2; - struct in6_addr in6; - if (n_chars >= 64) /* way too long */ - return 0; - memcpy(buf, s+1, n_chars); - buf[n_chars]='\0'; - return (evutil_inet_pton(AF_INET6,buf,&in6)==1) ? 1 : 0; - } -} - -static int -parse_authority(struct evhttp_uri *uri, char *s, char *eos) -{ - char *cp, *port; - EVUTIL_ASSERT(eos); - if (eos == s) { - uri->host = mm_strdup(""); - if (uri->host == NULL) { - event_warn("%s: strdup", __func__); - return -1; - } - return 0; - } - - /* Optionally, we start with "userinfo@" */ - - cp = strchr(s, '@'); - if (cp && cp < eos) { - if (! userinfo_ok(s,cp)) - return -1; - *cp++ = '\0'; - uri->userinfo = mm_strdup(s); - if (uri->userinfo == NULL) { - event_warn("%s: strdup", __func__); - return -1; - } - } else { - cp = s; - } - /* Optionally, we end with ":port" */ - for (port=eos-1; port >= cp && EVUTIL_ISDIGIT_(*port); --port) - ; - if (port >= cp && *port == ':') { - if (port+1 == eos) /* Leave port unspecified; the RFC allows a - * nil port */ - uri->port = -1; - else if ((uri->port = parse_port(port+1, eos))<0) - return -1; - eos = port; - } - /* Now, cp..eos holds the "host" port, which can be an IPv4Address, - * an IP-Literal, or a reg-name */ - EVUTIL_ASSERT(eos >= cp); - if (*cp == '[' && eos >= cp+2 && *(eos-1) == ']') { - /* IPv6address, IP-Literal, or junk. */ - if (! bracket_addr_ok(cp, eos)) - return -1; - } else { - /* Make sure the host part is ok. */ - if (! regname_ok(cp,eos)) /* Match IPv4Address or reg-name */ - return -1; - } - uri->host = mm_malloc(eos-cp+1); - if (uri->host == NULL) { - event_warn("%s: malloc", __func__); - return -1; - } - memcpy(uri->host, cp, eos-cp); - uri->host[eos-cp] = '\0'; - return 0; - -} - -static char * -end_of_authority(char *cp) -{ - while (*cp) { - if (*cp == '?' || *cp == '#' || *cp == '/') - return cp; - ++cp; - } - return cp; -} - -enum uri_part { - PART_PATH, - PART_QUERY, - PART_FRAGMENT -}; - -/* Return the character after the longest prefix of 'cp' that matches... - * *pchar / "/" if allow_qchars is false, or - * *(pchar / "/" / "?") if allow_qchars is true. - */ -static char * -end_of_path(char *cp, enum uri_part part, unsigned flags) -{ - if (flags & EVHTTP_URI_NONCONFORMANT) { - /* If NONCONFORMANT: - * Path is everything up to a # or ? or nul. - * Query is everything up a # or nul - * Fragment is everything up to a nul. - */ - switch (part) { - case PART_PATH: - while (*cp && *cp != '#' && *cp != '?') - ++cp; - break; - case PART_QUERY: - while (*cp && *cp != '#') - ++cp; - break; - case PART_FRAGMENT: - cp += strlen(cp); - break; - }; - return cp; - } - - while (*cp) { - if (CHAR_IS_UNRESERVED(*cp) || - strchr(SUBDELIMS, *cp) || - *cp == ':' || *cp == '@' || *cp == '/') - ++cp; - else if (*cp == '%' && EVUTIL_ISXDIGIT_(cp[1]) && - EVUTIL_ISXDIGIT_(cp[2])) - cp += 3; - else if (*cp == '?' && part != PART_PATH) - ++cp; - else - return cp; - } - return cp; -} - -static int -path_matches_noscheme(const char *cp) -{ - while (*cp) { - if (*cp == ':') - return 0; - else if (*cp == '/') - return 1; - ++cp; - } - return 1; -} - -struct evhttp_uri * -evhttp_uri_parse(const char *source_uri) -{ - return evhttp_uri_parse_with_flags(source_uri, 0); -} - -struct evhttp_uri * -evhttp_uri_parse_with_flags(const char *source_uri, unsigned flags) -{ - char *readbuf = NULL, *readp = NULL, *token = NULL, *query = NULL; - char *path = NULL, *fragment = NULL; - int got_authority = 0; - - struct evhttp_uri *uri = mm_calloc(1, sizeof(struct evhttp_uri)); - if (uri == NULL) { - event_warn("%s: calloc", __func__); - goto err; - } - uri->port = -1; - uri->flags = flags; - - readbuf = mm_strdup(source_uri); - if (readbuf == NULL) { - event_warn("%s: strdup", __func__); - goto err; - } - - readp = readbuf; - token = NULL; - - /* We try to follow RFC3986 here as much as we can, and match - the productions - - URI = scheme ":" hier-part [ "?" query ] [ "#" fragment ] - - relative-ref = relative-part [ "?" query ] [ "#" fragment ] - */ - - /* 1. scheme: */ - token = strchr(readp, ':'); - if (token && scheme_ok(readp,token)) { - *token = '\0'; - uri->scheme = mm_strdup(readp); - if (uri->scheme == NULL) { - event_warn("%s: strdup", __func__); - goto err; - } - readp = token+1; /* eat : */ - } - - /* 2. Optionally, "//" then an 'authority' part. */ - if (readp[0]=='/' && readp[1] == '/') { - char *authority; - readp += 2; - authority = readp; - path = end_of_authority(readp); - if (parse_authority(uri, authority, path) < 0) - goto err; - readp = path; - got_authority = 1; - } - - /* 3. Query: path-abempty, path-absolute, path-rootless, or path-empty - */ - path = readp; - readp = end_of_path(path, PART_PATH, flags); - - /* Query */ - if (*readp == '?') { - *readp = '\0'; - ++readp; - query = readp; - readp = end_of_path(readp, PART_QUERY, flags); - } - /* fragment */ - if (*readp == '#') { - *readp = '\0'; - ++readp; - fragment = readp; - readp = end_of_path(readp, PART_FRAGMENT, flags); - } - if (*readp != '\0') { - goto err; - } - - /* These next two cases may be unreachable; I'm leaving them - * in to be defensive. */ - /* If you didn't get an authority, the path can't begin with "//" */ - if (!got_authority && path[0]=='/' && path[1]=='/') - goto err; - /* If you did get an authority, the path must begin with "/" or be - * empty. */ - if (got_authority && path[0] != '/' && path[0] != '\0') - goto err; - /* (End of maybe-unreachable cases) */ - - /* If there was no scheme, the first part of the path (if any) must - * have no colon in it. */ - if (! uri->scheme && !path_matches_noscheme(path)) - goto err; - - EVUTIL_ASSERT(path); - uri->path = mm_strdup(path); - if (uri->path == NULL) { - event_warn("%s: strdup", __func__); - goto err; - } - - if (query) { - uri->query = mm_strdup(query); - if (uri->query == NULL) { - event_warn("%s: strdup", __func__); - goto err; - } - } - if (fragment) { - uri->fragment = mm_strdup(fragment); - if (uri->fragment == NULL) { - event_warn("%s: strdup", __func__); - goto err; - } - } - - mm_free(readbuf); - - return uri; -err: - if (uri) - evhttp_uri_free(uri); - if (readbuf) - mm_free(readbuf); - return NULL; -} - -void -evhttp_uri_free(struct evhttp_uri *uri) -{ -#define URI_FREE_STR_(f) \ - if (uri->f) { \ - mm_free(uri->f); \ - } - - URI_FREE_STR_(scheme); - URI_FREE_STR_(userinfo); - URI_FREE_STR_(host); - URI_FREE_STR_(path); - URI_FREE_STR_(query); - URI_FREE_STR_(fragment); - - mm_free(uri); -#undef URI_FREE_STR_ -} - -char * -evhttp_uri_join(struct evhttp_uri *uri, char *buf, size_t limit) -{ - struct evbuffer *tmp = 0; - size_t joined_size = 0; - char *output = NULL; - -#define URI_ADD_(f) evbuffer_add(tmp, uri->f, strlen(uri->f)) - - if (!uri || !buf || !limit) - return NULL; - - tmp = evbuffer_new(); - if (!tmp) - return NULL; - - if (uri->scheme) { - URI_ADD_(scheme); - evbuffer_add(tmp, ":", 1); - } - if (uri->host) { - evbuffer_add(tmp, "//", 2); - if (uri->userinfo) - evbuffer_add_printf(tmp,"%s@", uri->userinfo); - URI_ADD_(host); - if (uri->port >= 0) - evbuffer_add_printf(tmp,":%d", uri->port); - - if (uri->path && uri->path[0] != '/' && uri->path[0] != '\0') - goto err; - } - - if (uri->path) - URI_ADD_(path); - - if (uri->query) { - evbuffer_add(tmp, "?", 1); - URI_ADD_(query); - } - - if (uri->fragment) { - evbuffer_add(tmp, "#", 1); - URI_ADD_(fragment); - } - - evbuffer_add(tmp, "\0", 1); /* NUL */ - - joined_size = evbuffer_get_length(tmp); - - if (joined_size > limit) { - /* It doesn't fit. */ - evbuffer_free(tmp); - return NULL; - } - evbuffer_remove(tmp, buf, joined_size); - - output = buf; -err: - evbuffer_free(tmp); - - return output; -#undef URI_ADD_ -} - -const char * -evhttp_uri_get_scheme(const struct evhttp_uri *uri) -{ - return uri->scheme; -} -const char * -evhttp_uri_get_userinfo(const struct evhttp_uri *uri) -{ - return uri->userinfo; -} -const char * -evhttp_uri_get_host(const struct evhttp_uri *uri) -{ - return uri->host; -} -int -evhttp_uri_get_port(const struct evhttp_uri *uri) -{ - return uri->port; -} -const char * -evhttp_uri_get_path(const struct evhttp_uri *uri) -{ - return uri->path; -} -const char * -evhttp_uri_get_query(const struct evhttp_uri *uri) -{ - return uri->query; -} -const char * -evhttp_uri_get_fragment(const struct evhttp_uri *uri) -{ - return uri->fragment; -} - -#define URI_SET_STR_(f) do { \ - if (uri->f) \ - mm_free(uri->f); \ - if (f) { \ - if ((uri->f = mm_strdup(f)) == NULL) { \ - event_warn("%s: strdup()", __func__); \ - return -1; \ - } \ - } else { \ - uri->f = NULL; \ - } \ - } while(0) - -int -evhttp_uri_set_scheme(struct evhttp_uri *uri, const char *scheme) -{ - if (scheme && !scheme_ok(scheme, scheme+strlen(scheme))) - return -1; - - URI_SET_STR_(scheme); - return 0; -} -int -evhttp_uri_set_userinfo(struct evhttp_uri *uri, const char *userinfo) -{ - if (userinfo && !userinfo_ok(userinfo, userinfo+strlen(userinfo))) - return -1; - URI_SET_STR_(userinfo); - return 0; -} -int -evhttp_uri_set_host(struct evhttp_uri *uri, const char *host) -{ - if (host) { - if (host[0] == '[') { - if (! bracket_addr_ok(host, host+strlen(host))) - return -1; - } else { - if (! regname_ok(host, host+strlen(host))) - return -1; - } - } - - URI_SET_STR_(host); - return 0; -} -int -evhttp_uri_set_port(struct evhttp_uri *uri, int port) -{ - if (port < -1) - return -1; - uri->port = port; - return 0; -} -#define end_of_cpath(cp,p,f) \ - ((const char*)(end_of_path(((char*)(cp)), (p), (f)))) - -int -evhttp_uri_set_path(struct evhttp_uri *uri, const char *path) -{ - if (path && end_of_cpath(path, PART_PATH, uri->flags) != path+strlen(path)) - return -1; - - URI_SET_STR_(path); - return 0; -} -int -evhttp_uri_set_query(struct evhttp_uri *uri, const char *query) -{ - if (query && end_of_cpath(query, PART_QUERY, uri->flags) != query+strlen(query)) - return -1; - URI_SET_STR_(query); - return 0; -} -int -evhttp_uri_set_fragment(struct evhttp_uri *uri, const char *fragment) -{ - if (fragment && end_of_cpath(fragment, PART_FRAGMENT, uri->flags) != fragment+strlen(fragment)) - return -1; - URI_SET_STR_(fragment); - return 0; -} |