diff options
Diffstat (limited to 'libs/libssh2/src/session.c')
| -rw-r--r-- | libs/libssh2/src/session.c | 1794 |
1 files changed, 1794 insertions, 0 deletions
diff --git a/libs/libssh2/src/session.c b/libs/libssh2/src/session.c new file mode 100644 index 0000000000..6352d12ee7 --- /dev/null +++ b/libs/libssh2/src/session.c @@ -0,0 +1,1794 @@ +/* Copyright (c) 2004-2007 Sara Golemon <sarag@libssh2.org> + * Copyright (c) 2009-2015 by Daniel Stenberg + * Copyright (c) 2010 Simon Josefsson <simon@josefsson.org> + * All rights reserved. + * + * Redistribution and use in source and binary forms, + * with or without modification, are permitted provided + * that the following conditions are met: + * + * Redistributions of source code must retain the above + * copyright notice, this list of conditions and the + * following disclaimer. + * + * 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. + * + * Neither the name of the copyright holder nor the names + * of any other contributors may be used to endorse or + * promote products derived from this software without + * specific prior written permission. + * + * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND + * CONTRIBUTORS "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 COPYRIGHT OWNER OR + * CONTRIBUTORS 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 "libssh2_priv.h" +#include <errno.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif +#include <stdlib.h> +#include <fcntl.h> + +#ifdef HAVE_GETTIMEOFDAY +#include <sys/time.h> +#endif +#ifdef HAVE_ALLOCA_H +#include <alloca.h> +#endif + +#include "transport.h" +#include "session.h" +#include "channel.h" +#include "mac.h" +#include "misc.h" + +/* libssh2_default_alloc + */ +static +LIBSSH2_ALLOC_FUNC(libssh2_default_alloc) +{ + (void) abstract; + return malloc(count); +} + +/* libssh2_default_free + */ +static +LIBSSH2_FREE_FUNC(libssh2_default_free) +{ + (void) abstract; + free(ptr); +} + +/* libssh2_default_realloc + */ +static +LIBSSH2_REALLOC_FUNC(libssh2_default_realloc) +{ + (void) abstract; + return realloc(ptr, count); +} + +/* + * banner_receive + * + * Wait for a hello from the remote host + * Allocate a buffer and store the banner in session->remote.banner + * Returns: 0 on success, LIBSSH2_ERROR_EAGAIN if read would block, negative + * on failure + */ +static int +banner_receive(LIBSSH2_SESSION * session) +{ + int ret; + int banner_len; + + if (session->banner_TxRx_state == libssh2_NB_state_idle) { + banner_len = 0; + + session->banner_TxRx_state = libssh2_NB_state_created; + } else { + banner_len = session->banner_TxRx_total_send; + } + + while ((banner_len < (int) sizeof(session->banner_TxRx_banner)) && + ((banner_len == 0) + || (session->banner_TxRx_banner[banner_len - 1] != '\n'))) { + char c = '\0'; + + /* no incoming block yet! */ + session->socket_block_directions &= ~LIBSSH2_SESSION_BLOCK_INBOUND; + + ret = LIBSSH2_RECV(session, &c, 1, + LIBSSH2_SOCKET_RECV_FLAGS(session)); + if (ret < 0) { + if(session->api_block_mode || (ret != -EAGAIN)) + /* ignore EAGAIN when non-blocking */ + _libssh2_debug(session, LIBSSH2_TRACE_SOCKET, + "Error recving %d bytes: %d", 1, -ret); + } + else + _libssh2_debug(session, LIBSSH2_TRACE_SOCKET, + "Recved %d bytes banner", ret); + + if (ret < 0) { + if (ret == -EAGAIN) { + session->socket_block_directions = + LIBSSH2_SESSION_BLOCK_INBOUND; + session->banner_TxRx_total_send = banner_len; + return LIBSSH2_ERROR_EAGAIN; + } + + /* Some kinda error */ + session->banner_TxRx_state = libssh2_NB_state_idle; + session->banner_TxRx_total_send = 0; + return LIBSSH2_ERROR_SOCKET_RECV; + } + + if (ret == 0) { + session->socket_state = LIBSSH2_SOCKET_DISCONNECTED; + return LIBSSH2_ERROR_SOCKET_DISCONNECT; + } + + if (c == '\0') { + /* NULLs are not allowed in SSH banners */ + session->banner_TxRx_state = libssh2_NB_state_idle; + session->banner_TxRx_total_send = 0; + return LIBSSH2_ERROR_BANNER_RECV; + } + + session->banner_TxRx_banner[banner_len++] = c; + } + + while (banner_len && + ((session->banner_TxRx_banner[banner_len - 1] == '\n') || + (session->banner_TxRx_banner[banner_len - 1] == '\r'))) { + banner_len--; + } + + /* From this point on, we are done here */ + session->banner_TxRx_state = libssh2_NB_state_idle; + session->banner_TxRx_total_send = 0; + + if (!banner_len) + return LIBSSH2_ERROR_BANNER_RECV; + + session->remote.banner = LIBSSH2_ALLOC(session, banner_len + 1); + if (!session->remote.banner) { + return _libssh2_error(session, LIBSSH2_ERROR_ALLOC, + "Error allocating space for remote banner"); + } + memcpy(session->remote.banner, session->banner_TxRx_banner, banner_len); + session->remote.banner[banner_len] = '\0'; + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, "Received Banner: %s", + session->remote.banner); + return LIBSSH2_ERROR_NONE; +} + +/* + * banner_send + * + * Send the default banner, or the one set via libssh2_setopt_string + * + * Returns LIBSSH2_ERROR_EAGAIN if it would block - and if it does so, you + * should call this function again as soon as it is likely that more data can + * be sent, and this function should then be called with the same argument set + * (same data pointer and same data_len) until zero or failure is returned. + */ +static int +banner_send(LIBSSH2_SESSION * session) +{ + char *banner = (char *) LIBSSH2_SSH_DEFAULT_BANNER_WITH_CRLF; + int banner_len = sizeof(LIBSSH2_SSH_DEFAULT_BANNER_WITH_CRLF) - 1; + ssize_t ret; +#ifdef LIBSSH2DEBUG + char banner_dup[256]; +#endif + + if (session->banner_TxRx_state == libssh2_NB_state_idle) { + if (session->local.banner) { + /* setopt_string will have given us our \r\n characters */ + banner_len = strlen((char *) session->local.banner); + banner = (char *) session->local.banner; + } +#ifdef LIBSSH2DEBUG + /* Hack and slash to avoid sending CRLF in debug output */ + if (banner_len < 256) { + memcpy(banner_dup, banner, banner_len - 2); + banner_dup[banner_len - 2] = '\0'; + } else { + memcpy(banner_dup, banner, 255); + banner[255] = '\0'; + } + + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, "Sending Banner: %s", + banner_dup); +#endif + + session->banner_TxRx_state = libssh2_NB_state_created; + } + + /* no outgoing block yet! */ + session->socket_block_directions &= ~LIBSSH2_SESSION_BLOCK_OUTBOUND; + + ret = LIBSSH2_SEND(session, + banner + session->banner_TxRx_total_send, + banner_len - session->banner_TxRx_total_send, + LIBSSH2_SOCKET_SEND_FLAGS(session)); + if (ret < 0) + _libssh2_debug(session, LIBSSH2_TRACE_SOCKET, + "Error sending %d bytes: %d", + banner_len - session->banner_TxRx_total_send, -ret); + else + _libssh2_debug(session, LIBSSH2_TRACE_SOCKET, + "Sent %d/%d bytes at %p+%d", ret, + banner_len - session->banner_TxRx_total_send, + banner, session->banner_TxRx_total_send); + + if (ret != (banner_len - session->banner_TxRx_total_send)) { + if (ret >= 0 || ret == -EAGAIN) { + /* the whole packet could not be sent, save the what was */ + session->socket_block_directions = + LIBSSH2_SESSION_BLOCK_OUTBOUND; + if (ret > 0) + session->banner_TxRx_total_send += ret; + return LIBSSH2_ERROR_EAGAIN; + } + session->banner_TxRx_state = libssh2_NB_state_idle; + session->banner_TxRx_total_send = 0; + return LIBSSH2_ERROR_SOCKET_RECV; + } + + /* Set the state back to idle */ + session->banner_TxRx_state = libssh2_NB_state_idle; + session->banner_TxRx_total_send = 0; + + return 0; +} + +/* + * session_nonblock() sets the given socket to either blocking or + * non-blocking mode based on the 'nonblock' boolean argument. This function + * is copied from the libcurl sources with permission. + */ +static int +session_nonblock(libssh2_socket_t sockfd, /* operate on this */ + int nonblock /* TRUE or FALSE */ ) +{ +#undef SETBLOCK +#define SETBLOCK 0 +#ifdef HAVE_O_NONBLOCK + /* most recent unix versions */ + int flags; + + flags = fcntl(sockfd, F_GETFL, 0); + if (nonblock) + return fcntl(sockfd, F_SETFL, flags | O_NONBLOCK); + else + return fcntl(sockfd, F_SETFL, flags & (~O_NONBLOCK)); +#undef SETBLOCK +#define SETBLOCK 1 +#endif + +#if defined(HAVE_FIONBIO) && (SETBLOCK == 0) + /* older unix versions and VMS*/ + int flags; + + flags = nonblock; + return ioctl(sockfd, FIONBIO, &flags); +#undef SETBLOCK +#define SETBLOCK 2 +#endif + +#if defined(HAVE_IOCTLSOCKET) && (SETBLOCK == 0) + /* Windows? */ + unsigned long flags; + flags = nonblock; + + return ioctlsocket(sockfd, FIONBIO, &flags); +#undef SETBLOCK +#define SETBLOCK 3 +#endif + +#if defined(HAVE_IOCTLSOCKET_CASE) && (SETBLOCK == 0) + /* presumably for Amiga */ + return IoctlSocket(sockfd, FIONBIO, (long) nonblock); +#undef SETBLOCK +#define SETBLOCK 4 +#endif + +#if defined(HAVE_SO_NONBLOCK) && (SETBLOCK == 0) + /* BeOS */ + long b = nonblock ? 1 : 0; + return setsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b)); +#undef SETBLOCK +#define SETBLOCK 5 +#endif + +#ifdef HAVE_DISABLED_NONBLOCKING + return 0; /* returns success */ +#undef SETBLOCK +#define SETBLOCK 6 +#endif + +#if (SETBLOCK == 0) +#error "no non-blocking method was found/used/set" +#endif +} + +/* + * get_socket_nonblocking() + * + * gets the given blocking or non-blocking state of the socket. + */ +static int +get_socket_nonblocking(int sockfd) +{ /* operate on this */ +#undef GETBLOCK +#define GETBLOCK 0 +#ifdef HAVE_O_NONBLOCK + /* most recent unix versions */ + int flags; + + if ((flags = fcntl(sockfd, F_GETFL, 0)) == -1) { + /* Assume blocking on error */ + return 1; + } + return (flags & O_NONBLOCK); +#undef GETBLOCK +#define GETBLOCK 1 +#endif + +#if defined(WSAEWOULDBLOCK) && (GETBLOCK == 0) + /* Windows? */ + unsigned int option_value; + socklen_t option_len = sizeof(option_value); + + if (getsockopt + (sockfd, SOL_SOCKET, SO_ERROR, (void *) &option_value, &option_len)) { + /* Assume blocking on error */ + return 1; + } + return (int) option_value; +#undef GETBLOCK +#define GETBLOCK 2 +#endif + +#if defined(HAVE_SO_NONBLOCK) && (GETBLOCK == 0) + /* BeOS */ + long b; + if (getsockopt(sockfd, SOL_SOCKET, SO_NONBLOCK, &b, sizeof(b))) { + /* Assume blocking on error */ + return 1; + } + return (int) b; +#undef GETBLOCK +#define GETBLOCK 5 +#endif + +#if defined(SO_STATE) && defined( __VMS ) && (GETBLOCK == 0) + + /* VMS TCP/IP Services */ + + size_t sockstat = 0; + int callstat = 0; + size_t size = sizeof( int ); + + callstat = getsockopt(sockfd, SOL_SOCKET, SO_STATE, + (char *)&sockstat, &size); + if ( callstat == -1 ) return(0); + if ( (sockstat&SS_NBIO) )return(1); + return(0); + +#undef GETBLOCK +#define GETBLOCK 6 +#endif + +#ifdef HAVE_DISABLED_NONBLOCKING + return 1; /* returns blocking */ +#undef GETBLOCK +#define GETBLOCK 7 +#endif + +#if (GETBLOCK == 0) +#error "no non-blocking method was found/used/get" +#endif +} + +/* libssh2_session_banner_set + * Set the local banner to use in the server handshake. + */ +LIBSSH2_API int +libssh2_session_banner_set(LIBSSH2_SESSION * session, const char *banner) +{ + size_t banner_len = banner ? strlen(banner) : 0; + + if (session->local.banner) { + LIBSSH2_FREE(session, session->local.banner); + session->local.banner = NULL; + } + + if (!banner_len) + return 0; + + session->local.banner = LIBSSH2_ALLOC(session, banner_len + 3); + if (!session->local.banner) { + return _libssh2_error(session, LIBSSH2_ERROR_ALLOC, + "Unable to allocate memory for local banner"); + } + + memcpy(session->local.banner, banner, banner_len); + + /* first zero terminate like this so that the debug output is nice */ + session->local.banner[banner_len] = '\0'; + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, "Setting local Banner: %s", + session->local.banner); + session->local.banner[banner_len++] = '\r'; + session->local.banner[banner_len++] = '\n'; + session->local.banner[banner_len] = '\0'; + + return 0; +} + +/* libssh2_banner_set + * Set the local banner. DEPRECATED VERSION + */ +LIBSSH2_API int +libssh2_banner_set(LIBSSH2_SESSION * session, const char *banner) +{ + return libssh2_session_banner_set(session, banner); +} + +/* + * libssh2_session_init_ex + * + * Allocate and initialize a libssh2 session structure. Allows for malloc + * callbacks in case the calling program has its own memory manager It's + * allowable (but unadvisable) to define some but not all of the malloc + * callbacks An additional pointer value may be optionally passed to be sent + * to the callbacks (so they know who's asking) + */ +LIBSSH2_API LIBSSH2_SESSION * +libssh2_session_init_ex(LIBSSH2_ALLOC_FUNC((*my_alloc)), + LIBSSH2_FREE_FUNC((*my_free)), + LIBSSH2_REALLOC_FUNC((*my_realloc)), void *abstract) +{ + LIBSSH2_ALLOC_FUNC((*local_alloc)) = libssh2_default_alloc; + LIBSSH2_FREE_FUNC((*local_free)) = libssh2_default_free; + LIBSSH2_REALLOC_FUNC((*local_realloc)) = libssh2_default_realloc; + LIBSSH2_SESSION *session; + + if (my_alloc) { + local_alloc = my_alloc; + } + if (my_free) { + local_free = my_free; + } + if (my_realloc) { + local_realloc = my_realloc; + } + + session = local_alloc(sizeof(LIBSSH2_SESSION), &abstract); + if (session) { + memset(session, 0, sizeof(LIBSSH2_SESSION)); + session->alloc = local_alloc; + session->free = local_free; + session->realloc = local_realloc; + session->send = _libssh2_send; + session->recv = _libssh2_recv; + session->abstract = abstract; + session->api_timeout = 0; /* timeout-free API by default */ + session->api_block_mode = 1; /* blocking API by default */ + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "New session resource allocated"); + _libssh2_init_if_needed (); + } + return session; +} + +/* + * libssh2_session_callback_set + * + * Set (or reset) a callback function + * Returns the prior address + * + * FIXME: this function relies on that we can typecast function pointers + * to void pointers, which isn't allowed in ISO C! + */ +LIBSSH2_API void * +libssh2_session_callback_set(LIBSSH2_SESSION * session, + int cbtype, void *callback) +{ + void *oldcb; + + switch (cbtype) { + case LIBSSH2_CALLBACK_IGNORE: + oldcb = session->ssh_msg_ignore; + session->ssh_msg_ignore = callback; + return oldcb; + + case LIBSSH2_CALLBACK_DEBUG: + oldcb = session->ssh_msg_debug; + session->ssh_msg_debug = callback; + return oldcb; + + case LIBSSH2_CALLBACK_DISCONNECT: + oldcb = session->ssh_msg_disconnect; + session->ssh_msg_disconnect = callback; + return oldcb; + + case LIBSSH2_CALLBACK_MACERROR: + oldcb = session->macerror; + session->macerror = callback; + return oldcb; + + case LIBSSH2_CALLBACK_X11: + oldcb = session->x11; + session->x11 = callback; + return oldcb; + + case LIBSSH2_CALLBACK_SEND: + oldcb = session->send; + session->send = callback; + return oldcb; + + case LIBSSH2_CALLBACK_RECV: + oldcb = session->recv; + session->recv = callback; + return oldcb; + } + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, "Setting Callback %d", cbtype); + + return NULL; +} + +/* + * _libssh2_wait_socket() + * + * Utility function that waits for action on the socket. Returns 0 when ready + * to run again or error on timeout. + */ +int _libssh2_wait_socket(LIBSSH2_SESSION *session, time_t start_time) +{ + int rc; + int seconds_to_next; + int dir; + int has_timeout; + long ms_to_next = 0; + long elapsed_ms; + + /* since libssh2 often sets EAGAIN internally before this function is + called, we can decrease some amount of confusion in user programs by + resetting the error code in this function to reduce the risk of EAGAIN + being stored as error when a blocking function has returned */ + session->err_code = LIBSSH2_ERROR_NONE; + + rc = libssh2_keepalive_send (session, &seconds_to_next); + if (rc < 0) + return rc; + + ms_to_next = seconds_to_next * 1000; + + /* figure out what to wait for */ + dir = libssh2_session_block_directions(session); + + if(!dir) { + _libssh2_debug(session, LIBSSH2_TRACE_SOCKET, + "Nothing to wait for in wait_socket"); + /* To avoid that we hang below just because there's nothing set to + wait for, we timeout on 1 second to also avoid busy-looping + during this condition */ + ms_to_next = 1000; + } + + if (session->api_timeout > 0 && + (seconds_to_next == 0 || + ms_to_next > session->api_timeout)) { + time_t now = time (NULL); + elapsed_ms = (long)(1000*difftime(now, start_time)); + if (elapsed_ms > session->api_timeout) { + return _libssh2_error(session, LIBSSH2_ERROR_TIMEOUT, + "API timeout expired"); + } + ms_to_next = (session->api_timeout - elapsed_ms); + has_timeout = 1; + } + else if (ms_to_next > 0) { + has_timeout = 1; + } + else + has_timeout = 0; + +#ifdef HAVE_POLL + { + struct pollfd sockets[1]; + + sockets[0].fd = session->socket_fd; + sockets[0].events = 0; + sockets[0].revents = 0; + + if(dir & LIBSSH2_SESSION_BLOCK_INBOUND) + sockets[0].events |= POLLIN; + + if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND) + sockets[0].events |= POLLOUT; + + rc = poll(sockets, 1, has_timeout?ms_to_next: -1); + } +#else + { + fd_set rfd; + fd_set wfd; + fd_set *writefd = NULL; + fd_set *readfd = NULL; + struct timeval tv; + + tv.tv_sec = ms_to_next / 1000; + tv.tv_usec = (ms_to_next - tv.tv_sec*1000) * 1000; + + if(dir & LIBSSH2_SESSION_BLOCK_INBOUND) { + FD_ZERO(&rfd); + FD_SET(session->socket_fd, &rfd); + readfd = &rfd; + } + + if(dir & LIBSSH2_SESSION_BLOCK_OUTBOUND) { + FD_ZERO(&wfd); + FD_SET(session->socket_fd, &wfd); + writefd = &wfd; + } + + rc = select(session->socket_fd + 1, readfd, writefd, NULL, + has_timeout ? &tv : NULL); + } +#endif + if(rc == 0) { + return _libssh2_error(session, LIBSSH2_ERROR_TIMEOUT, + "Timed out waiting on socket"); + } + if(rc < 0) { + return _libssh2_error(session, LIBSSH2_ERROR_TIMEOUT, + "Error waiting on socket"); + } + + return 0; /* ready to try again */ +} + +static int +session_startup(LIBSSH2_SESSION *session, libssh2_socket_t sock) +{ + int rc; + + if (session->startup_state == libssh2_NB_state_idle) { + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "session_startup for socket %d", sock); + if (LIBSSH2_INVALID_SOCKET == sock) { + /* Did we forget something? */ + return _libssh2_error(session, LIBSSH2_ERROR_BAD_SOCKET, + "Bad socket provided"); + } + session->socket_fd = sock; + + session->socket_prev_blockstate = + !get_socket_nonblocking(session->socket_fd); + + if (session->socket_prev_blockstate) { + /* If in blocking state change to non-blocking */ + rc = session_nonblock(session->socket_fd, 1); + if (rc) { + return _libssh2_error(session, rc, + "Failed changing socket's " + "blocking state to non-blocking"); + } + } + + session->startup_state = libssh2_NB_state_created; + } + + if (session->startup_state == libssh2_NB_state_created) { + rc = banner_send(session); + if (rc) { + return _libssh2_error(session, rc, + "Failed sending banner"); + } + session->startup_state = libssh2_NB_state_sent; + session->banner_TxRx_state = libssh2_NB_state_idle; + } + + if (session->startup_state == libssh2_NB_state_sent) { + do { + rc = banner_receive(session); + if (rc) + return _libssh2_error(session, rc, + "Failed getting banner"); + } while(strncmp("SSH-", (char *)session->remote.banner, 4)); + + session->startup_state = libssh2_NB_state_sent1; + } + + if (session->startup_state == libssh2_NB_state_sent1) { + rc = _libssh2_kex_exchange(session, 0, &session->startup_key_state); + if (rc) + return _libssh2_error(session, rc, + "Unable to exchange encryption keys"); + + session->startup_state = libssh2_NB_state_sent2; + } + + if (session->startup_state == libssh2_NB_state_sent2) { + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "Requesting userauth service"); + + /* Request the userauth service */ + session->startup_service[0] = SSH_MSG_SERVICE_REQUEST; + _libssh2_htonu32(session->startup_service + 1, + sizeof("ssh-userauth") - 1); + memcpy(session->startup_service + 5, "ssh-userauth", + sizeof("ssh-userauth") - 1); + + session->startup_state = libssh2_NB_state_sent3; + } + + if (session->startup_state == libssh2_NB_state_sent3) { + rc = _libssh2_transport_send(session, session->startup_service, + sizeof("ssh-userauth") + 5 - 1, + NULL, 0); + if (rc) { + return _libssh2_error(session, rc, + "Unable to ask for ssh-userauth service"); + } + + session->startup_state = libssh2_NB_state_sent4; + } + + if (session->startup_state == libssh2_NB_state_sent4) { + rc = _libssh2_packet_require(session, SSH_MSG_SERVICE_ACCEPT, + &session->startup_data, + &session->startup_data_len, 0, NULL, 0, + &session->startup_req_state); + if (rc) + return rc; + + session->startup_service_length = + _libssh2_ntohu32(session->startup_data + 1); + + if ((session->startup_service_length != (sizeof("ssh-userauth") - 1)) + || strncmp("ssh-userauth", (char *) session->startup_data + 5, + session->startup_service_length)) { + LIBSSH2_FREE(session, session->startup_data); + session->startup_data = NULL; + return _libssh2_error(session, LIBSSH2_ERROR_PROTO, + "Invalid response received from server"); + } + LIBSSH2_FREE(session, session->startup_data); + session->startup_data = NULL; + + session->startup_state = libssh2_NB_state_idle; + + return 0; + } + + /* just for safety return some error */ + return LIBSSH2_ERROR_INVAL; +} + +/* + * libssh2_session_handshake() + * + * session: LIBSSH2_SESSION struct allocated and owned by the calling program + * sock: *must* be populated with an opened and connected socket. + * + * Returns: 0 on success, or non-zero on failure + */ +LIBSSH2_API int +libssh2_session_handshake(LIBSSH2_SESSION *session, libssh2_socket_t sock) +{ + int rc; + + BLOCK_ADJUST(rc, session, session_startup(session, sock) ); + + return rc; +} + +/* + * libssh2_session_startup() + * + * DEPRECATED. Use libssh2_session_handshake() instead! This function is not + * portable enough. + * + * session: LIBSSH2_SESSION struct allocated and owned by the calling program + * sock: *must* be populated with an opened and connected socket. + * + * Returns: 0 on success, or non-zero on failure + */ +LIBSSH2_API int +libssh2_session_startup(LIBSSH2_SESSION *session, int sock) +{ + return libssh2_session_handshake(session, (libssh2_socket_t) sock); +} + +/* + * libssh2_session_free + * + * Frees the memory allocated to the session + * Also closes and frees any channels attached to this session + */ +static int +session_free(LIBSSH2_SESSION *session) +{ + int rc; + LIBSSH2_PACKET *pkg; + LIBSSH2_CHANNEL *ch; + LIBSSH2_LISTENER *l; + int packets_left = 0; + + if (session->free_state == libssh2_NB_state_idle) { + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, "Freeing session resource", + session->remote.banner); + + session->free_state = libssh2_NB_state_created; + } + + if (session->free_state == libssh2_NB_state_created) { + while ((ch = _libssh2_list_first(&session->channels))) { + + rc = _libssh2_channel_free(ch); + if (rc == LIBSSH2_ERROR_EAGAIN) + return rc; + } + + session->free_state = libssh2_NB_state_sent; + } + + if (session->free_state == libssh2_NB_state_sent) { + while ((l = _libssh2_list_first(&session->listeners))) { + rc = _libssh2_channel_forward_cancel(l); + if (rc == LIBSSH2_ERROR_EAGAIN) + return rc; + } + + session->free_state = libssh2_NB_state_sent1; + } + + if (session->state & LIBSSH2_STATE_NEWKEYS) { + /* hostkey */ + if (session->hostkey && session->hostkey->dtor) { + session->hostkey->dtor(session, &session->server_hostkey_abstract); + } + + /* Client to Server */ + /* crypt */ + if (session->local.crypt && session->local.crypt->dtor) { + session->local.crypt->dtor(session, + &session->local.crypt_abstract); + } + /* comp */ + if (session->local.comp && session->local.comp->dtor) { + session->local.comp->dtor(session, 1, + &session->local.comp_abstract); + } + /* mac */ + if (session->local.mac && session->local.mac->dtor) { + session->local.mac->dtor(session, &session->local.mac_abstract); + } + + /* Server to Client */ + /* crypt */ + if (session->remote.crypt && session->remote.crypt->dtor) { + session->remote.crypt->dtor(session, + &session->remote.crypt_abstract); + } + /* comp */ + if (session->remote.comp && session->remote.comp->dtor) { + session->remote.comp->dtor(session, 0, + &session->remote.comp_abstract); + } + /* mac */ + if (session->remote.mac && session->remote.mac->dtor) { + session->remote.mac->dtor(session, &session->remote.mac_abstract); + } + + /* session_id */ + if (session->session_id) { + LIBSSH2_FREE(session, session->session_id); + } + } + + /* Free banner(s) */ + if (session->remote.banner) { + LIBSSH2_FREE(session, session->remote.banner); + } + if (session->local.banner) { + LIBSSH2_FREE(session, session->local.banner); + } + + /* Free preference(s) */ + if (session->kex_prefs) { + LIBSSH2_FREE(session, session->kex_prefs); + } + if (session->hostkey_prefs) { + LIBSSH2_FREE(session, session->hostkey_prefs); + } + + if (session->local.kexinit) { + LIBSSH2_FREE(session, session->local.kexinit); + } + if (session->local.crypt_prefs) { + LIBSSH2_FREE(session, session->local.crypt_prefs); + } + if (session->local.mac_prefs) { + LIBSSH2_FREE(session, session->local.mac_prefs); + } + if (session->local.comp_prefs) { + LIBSSH2_FREE(session, session->local.comp_prefs); + } + if (session->local.lang_prefs) { + LIBSSH2_FREE(session, session->local.lang_prefs); + } + + if (session->remote.kexinit) { + LIBSSH2_FREE(session, session->remote.kexinit); + } + if (session->remote.crypt_prefs) { + LIBSSH2_FREE(session, session->remote.crypt_prefs); + } + if (session->remote.mac_prefs) { + LIBSSH2_FREE(session, session->remote.mac_prefs); + } + if (session->remote.comp_prefs) { + LIBSSH2_FREE(session, session->remote.comp_prefs); + } + if (session->remote.lang_prefs) { + LIBSSH2_FREE(session, session->remote.lang_prefs); + } + + /* + * Make sure all memory used in the state variables are free + */ + if (session->kexinit_data) { + LIBSSH2_FREE(session, session->kexinit_data); + } + if (session->startup_data) { + LIBSSH2_FREE(session, session->startup_data); + } + if (session->userauth_list_data) { + LIBSSH2_FREE(session, session->userauth_list_data); + } + if (session->userauth_pswd_data) { + LIBSSH2_FREE(session, session->userauth_pswd_data); + } + if (session->userauth_pswd_newpw) { + LIBSSH2_FREE(session, session->userauth_pswd_newpw); + } + if (session->userauth_host_packet) { + LIBSSH2_FREE(session, session->userauth_host_packet); + } + if (session->userauth_host_method) { + LIBSSH2_FREE(session, session->userauth_host_method); + } + if (session->userauth_host_data) { + LIBSSH2_FREE(session, session->userauth_host_data); + } + if (session->userauth_pblc_data) { + LIBSSH2_FREE(session, session->userauth_pblc_data); + } + if (session->userauth_pblc_packet) { + LIBSSH2_FREE(session, session->userauth_pblc_packet); + } + if (session->userauth_pblc_method) { + LIBSSH2_FREE(session, session->userauth_pblc_method); + } + if (session->userauth_kybd_data) { + LIBSSH2_FREE(session, session->userauth_kybd_data); + } + if (session->userauth_kybd_packet) { + LIBSSH2_FREE(session, session->userauth_kybd_packet); + } + if (session->userauth_kybd_auth_instruction) { + LIBSSH2_FREE(session, session->userauth_kybd_auth_instruction); + } + if (session->open_packet) { + LIBSSH2_FREE(session, session->open_packet); + } + if (session->open_data) { + LIBSSH2_FREE(session, session->open_data); + } + if (session->direct_message) { + LIBSSH2_FREE(session, session->direct_message); + } + if (session->fwdLstn_packet) { + LIBSSH2_FREE(session, session->fwdLstn_packet); + } + if (session->pkeyInit_data) { + LIBSSH2_FREE(session, session->pkeyInit_data); + } + if (session->scpRecv_command) { + LIBSSH2_FREE(session, session->scpRecv_command); + } + if (session->scpSend_command) { + LIBSSH2_FREE(session, session->scpSend_command); + } + if (session->sftpInit_sftp) { + LIBSSH2_FREE(session, session->sftpInit_sftp); + } + + /* Free payload buffer */ + if (session->packet.total_num) { + LIBSSH2_FREE(session, session->packet.payload); + } + + /* Cleanup all remaining packets */ + while ((pkg = _libssh2_list_first(&session->packets))) { + packets_left++; + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "packet left with id %d", pkg->data[0]); + /* unlink the node */ + _libssh2_list_remove(&pkg->node); + + /* free */ + LIBSSH2_FREE(session, pkg->data); + LIBSSH2_FREE(session, pkg); + } + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "Extra packets left %d", packets_left); + + if(session->socket_prev_blockstate) { + /* if the socket was previously blocking, put it back so */ + rc = session_nonblock(session->socket_fd, 0); + if (rc) { + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "unable to reset socket's blocking state"); + } + } + + if (session->server_hostkey) { + LIBSSH2_FREE(session, session->server_hostkey); + } + + /* error string */ + if (session->err_msg && ((session->err_flags & LIBSSH2_ERR_FLAG_DUP) != 0)) { + LIBSSH2_FREE(session, (char *)session->err_msg); + } + + LIBSSH2_FREE(session, session); + + return 0; +} + +/* + * libssh2_session_free + * + * Frees the memory allocated to the session + * Also closes and frees any channels attached to this session + */ +LIBSSH2_API int +libssh2_session_free(LIBSSH2_SESSION * session) +{ + int rc; + + BLOCK_ADJUST(rc, session, session_free(session) ); + + return rc; +} + +/* + * libssh2_session_disconnect_ex + */ +static int +session_disconnect(LIBSSH2_SESSION *session, int reason, + const char *description, + const char *lang) +{ + unsigned char *s; + unsigned long descr_len = 0, lang_len = 0; + int rc; + + if (session->disconnect_state == libssh2_NB_state_idle) { + _libssh2_debug(session, LIBSSH2_TRACE_TRANS, + "Disconnecting: reason=%d, desc=%s, lang=%s", reason, + description, lang); + if (description) + descr_len = strlen(description); + + if (lang) + lang_len = strlen(lang); + + if(descr_len > 256) + return _libssh2_error(session, LIBSSH2_ERROR_INVAL, + "too long description"); + + /* 13 = packet_type(1) + reason code(4) + descr_len(4) + lang_len(4) */ + session->disconnect_data_len = descr_len + lang_len + 13; + + s = session->disconnect_data; + + *(s++) = SSH_MSG_DISCONNECT; + _libssh2_store_u32(&s, reason); + _libssh2_store_str(&s, description, descr_len); + /* store length only, lang is sent separately */ + _libssh2_store_u32(&s, lang_len); + + session->disconnect_state = libssh2_NB_state_created; + } + + rc = _libssh2_transport_send(session, session->disconnect_data, + session->disconnect_data_len, + (unsigned char *)lang, lang_len); + if (rc == LIBSSH2_ERROR_EAGAIN) + return rc; + + session->disconnect_state = libssh2_NB_state_idle; + + return 0; +} + +/* + * libssh2_session_disconnect_ex + */ +LIBSSH2_API int +libssh2_session_disconnect_ex(LIBSSH2_SESSION *session, int reason, + const char *desc, const char *lang) +{ + int rc; + + BLOCK_ADJUST(rc, session, + session_disconnect(session, reason, desc, lang)); + + return rc; +} + +/* libssh2_session_methods + * + * Return the currently active methods for method_type + * + * NOTE: Currently lang_cs and lang_sc are ALWAYS set to empty string + * regardless of actual negotiation Strings should NOT be freed + */ +LIBSSH2_API const char * +libssh2_session_methods(LIBSSH2_SESSION * session, int method_type) +{ + /* All methods have char *name as their first element */ + const LIBSSH2_KEX_METHOD *method = NULL; + + switch (method_type) { + case LIBSSH2_METHOD_KEX: + method = session->kex; + break; + + case LIBSSH2_METHOD_HOSTKEY: + method = (LIBSSH2_KEX_METHOD *) session->hostkey; + break; + + case LIBSSH2_METHOD_CRYPT_CS: + method = (LIBSSH2_KEX_METHOD *) session->local.crypt; + break; + + case LIBSSH2_METHOD_CRYPT_SC: + method = (LIBSSH2_KEX_METHOD *) session->remote.crypt; + break; + + case LIBSSH2_METHOD_MAC_CS: + method = (LIBSSH2_KEX_METHOD *) session->local.mac; + break; + + case LIBSSH2_METHOD_MAC_SC: + method = (LIBSSH2_KEX_METHOD *) session->remote.mac; + break; + + case LIBSSH2_METHOD_COMP_CS: + method = (LIBSSH2_KEX_METHOD *) session->local.comp; + break; + + case LIBSSH2_METHOD_COMP_SC: + method = (LIBSSH2_KEX_METHOD *) session->remote.comp; + break; + + case LIBSSH2_METHOD_LANG_CS: + return ""; + + case LIBSSH2_METHOD_LANG_SC: + return ""; + + default: + _libssh2_error(session, LIBSSH2_ERROR_INVAL, + "Invalid parameter specified for method_type"); + return NULL; + } + + if (!method) { + _libssh2_error(session, LIBSSH2_ERROR_METHOD_NONE, + "No method negotiated"); + return NULL; + } + + return method->name; +} + +/* libssh2_session_abstract + * Retrieve a pointer to the abstract property + */ +LIBSSH2_API void ** +libssh2_session_abstract(LIBSSH2_SESSION * session) +{ + return &session->abstract; +} + +/* libssh2_session_last_error + * + * Returns error code and populates an error string into errmsg If want_buf is + * non-zero then the string placed into errmsg must be freed by the calling + * program. Otherwise it is assumed to be owned by libssh2 + */ +LIBSSH2_API int +libssh2_session_last_error(LIBSSH2_SESSION * session, char **errmsg, + int *errmsg_len, int want_buf) +{ + size_t msglen = 0; + + /* No error to report */ + if (!session->err_code) { + if (errmsg) { + if (want_buf) { + *errmsg = LIBSSH2_ALLOC(session, 1); + if (*errmsg) { + **errmsg = 0; + } + } else { + *errmsg = (char *) ""; + } + } + if (errmsg_len) { + *errmsg_len = 0; + } + return 0; + } + + if (errmsg) { + const char *error = session->err_msg ? session->err_msg : ""; + + msglen = strlen(error); + + if (want_buf) { + /* Make a copy so the calling program can own it */ + *errmsg = LIBSSH2_ALLOC(session, msglen + 1); + if (*errmsg) { + memcpy(*errmsg, error, msglen); + (*errmsg)[msglen] = 0; + } + } + else + *errmsg = (char *)error; + } + + if (errmsg_len) { + *errmsg_len = msglen; + } + + return session->err_code; +} + +/* libssh2_session_last_errno + * + * Returns error code + */ +LIBSSH2_API int +libssh2_session_last_errno(LIBSSH2_SESSION * session) +{ + return session->err_code; +} + +/* libssh2_session_set_last_error + * + * Sets the internal error code for the session. + * + * This function is available specifically to be used by high level + * language wrappers (i.e. Python or Perl) that may extend the library + * features while still relying on its error reporting mechanism. + */ +LIBSSH2_API int +libssh2_session_set_last_error(LIBSSH2_SESSION* session, + int errcode, + const char* errmsg) +{ + return _libssh2_error_flags(session, errcode, errmsg, + LIBSSH2_ERR_FLAG_DUP); +} + +/* Libssh2_session_flag + * + * Set/Get session flags + * + * Return error code. + */ +LIBSSH2_API int +libssh2_session_flag(LIBSSH2_SESSION * session, int flag, int value) +{ + switch(flag) { + case LIBSSH2_FLAG_SIGPIPE: + session->flag.sigpipe = value; + break; + case LIBSSH2_FLAG_COMPRESS: + session->flag.compress = value; + break; + default: + /* unknown flag */ + return LIBSSH2_ERROR_INVAL; + } + + return LIBSSH2_ERROR_NONE; +} + +/* _libssh2_session_set_blocking + * + * Set a session's blocking mode on or off, return the previous status when + * this function is called. Note this function does not alter the state of the + * actual socket involved. + */ +int +_libssh2_session_set_blocking(LIBSSH2_SESSION *session, int blocking) +{ + int bl = session->api_block_mode; + _libssh2_debug(session, LIBSSH2_TRACE_CONN, + "Setting blocking mode %s", blocking?"ON":"OFF"); + session->api_block_mode = blocking; + + return bl; +} + +/* libssh2_session_set_blocking + * + * Set a channel's blocking mode on or off, similar to a socket's + * fcntl(fd, F_SETFL, O_NONBLOCK); type command + */ +LIBSSH2_API void +libssh2_session_set_blocking(LIBSSH2_SESSION * session, int blocking) +{ + (void) _libssh2_session_set_blocking(session, blocking); +} + +/* libssh2_session_get_blocking + * + * Returns a session's blocking mode on or off + */ +LIBSSH2_API int +libssh2_session_get_blocking(LIBSSH2_SESSION * session) +{ + return session->api_block_mode; +} + + +/* libssh2_session_set_timeout + * + * Set a session's timeout (in msec) for blocking mode, + * or 0 to disable timeouts. + */ +LIBSSH2_API void +libssh2_session_set_timeout(LIBSSH2_SESSION * session, long timeout) +{ + session->api_timeout = timeout; +} + +/* libssh2_session_get_timeout + * + * Returns a session's timeout, or 0 if disabled + */ +LIBSSH2_API long +libssh2_session_get_timeout(LIBSSH2_SESSION * session) +{ + return session->api_timeout; +} + +/* + * libssh2_poll_channel_read + * + * Returns 0 if no data is waiting on channel, + * non-0 if data is available + */ +LIBSSH2_API int +libssh2_poll_channel_read(LIBSSH2_CHANNEL *channel, int extended) +{ + LIBSSH2_SESSION *session; + LIBSSH2_PACKET *packet; + + if(!channel) + return LIBSSH2_ERROR_BAD_USE; + + session = channel->session; + packet = _libssh2_list_first(&session->packets); + + while (packet) { + if ( channel->local.id == _libssh2_ntohu32(packet->data + 1)) { + if ( extended == 1 && + (packet->data[0] == SSH_MSG_CHANNEL_EXTENDED_DATA + || packet->data[0] == SSH_MSG_CHANNEL_DATA )) { + return 1; + } else if ( extended == 0 && + packet->data[0] == SSH_MSG_CHANNEL_DATA) { + return 1; + } + /* else - no data of any type is ready to be read */ + } + packet = _libssh2_list_next(&packet->node); + } + + return 0; +} + +/* + * poll_channel_write + * + * Returns 0 if writing to channel would block, + * non-0 if data can be written without blocking + */ +static inline int +poll_channel_write(LIBSSH2_CHANNEL * channel) +{ + return channel->local.window_size ? 1 : 0; +} + +/* poll_listener_queued + * + * Returns 0 if no connections are waiting to be accepted + * non-0 if one or more connections are available + */ +static inline int +poll_listener_queued(LIBSSH2_LISTENER * listener) +{ + return _libssh2_list_first(&listener->queue) ? 1 : 0; +} + +/* + * libssh2_poll + * + * Poll sockets, channels, and listeners for activity + */ +LIBSSH2_API int +libssh2_poll(LIBSSH2_POLLFD * fds, unsigned int nfds, long timeout) +{ + long timeout_remaining; + unsigned int i, active_fds; +#ifdef HAVE_POLL + LIBSSH2_SESSION *session = NULL; +#ifdef HAVE_ALLOCA + struct pollfd *sockets = alloca(sizeof(struct pollfd) * nfds); +#else + struct pollfd sockets[256]; + + if (nfds > 256) + /* systems without alloca use a fixed-size array, this can be fixed if + we really want to, at least if the compiler is a C99 capable one */ + return -1; +#endif + /* Setup sockets for polling */ + for(i = 0; i < nfds; i++) { + fds[i].revents = 0; + switch (fds[i].type) { + case LIBSSH2_POLLFD_SOCKET: + sockets[i].fd = fds[i].fd.socket; + sockets[i].events = fds[i].events; + sockets[i].revents = 0; + break; + + case LIBSSH2_POLLFD_CHANNEL: + sockets[i].fd = fds[i].fd.channel->session->socket_fd; + sockets[i].events = POLLIN; + sockets[i].revents = 0; + if (!session) + session = fds[i].fd.channel->session; + break; + + case LIBSSH2_POLLFD_LISTENER: + sockets[i].fd = fds[i].fd.listener->session->socket_fd; + sockets[i].events = POLLIN; + sockets[i].revents = 0; + if (!session) + session = fds[i].fd.listener->session; + break; + + default: + if (session) + _libssh2_error(session, LIBSSH2_ERROR_INVALID_POLL_TYPE, + "Invalid descriptor passed to libssh2_poll()"); + return -1; + } + } +#elif defined(HAVE_SELECT) + LIBSSH2_SESSION *session = NULL; + libssh2_socket_t maxfd = 0; + fd_set rfds, wfds; + struct timeval tv; + + FD_ZERO(&rfds); + FD_ZERO(&wfds); + for(i = 0; i < nfds; i++) { + fds[i].revents = 0; + switch (fds[i].type) { + case LIBSSH2_POLLFD_SOCKET: + if (fds[i].events & LIBSSH2_POLLFD_POLLIN) { + FD_SET(fds[i].fd.socket, &rfds); + if (fds[i].fd.socket > maxfd) + maxfd = fds[i].fd.socket; + } + if (fds[i].events & LIBSSH2_POLLFD_POLLOUT) { + FD_SET(fds[i].fd.socket, &wfds); + if (fds[i].fd.socket > maxfd) + maxfd = fds[i].fd.socket; + } + break; + + case LIBSSH2_POLLFD_CHANNEL: + FD_SET(fds[i].fd.channel->session->socket_fd, &rfds); + if (fds[i].fd.channel->session->socket_fd > maxfd) + maxfd = fds[i].fd.channel->session->socket_fd; + if (!session) + session = fds[i].fd.channel->session; + break; + + case LIBSSH2_POLLFD_LISTENER: + FD_SET(fds[i].fd.listener->session->socket_fd, &rfds); + if (fds[i].fd.listener->session->socket_fd > maxfd) + maxfd = fds[i].fd.listener->session->socket_fd; + if (!session) + session = fds[i].fd.listener->session; + break; + + default: + if (session) + _libssh2_error(session, LIBSSH2_ERROR_INVALID_POLL_TYPE, + "Invalid descriptor passed to libssh2_poll()"); + return -1; + } + } +#else + /* No select() or poll() + * no sockets structure to setup + */ + + timeout = 0; +#endif /* HAVE_POLL or HAVE_SELECT */ + + timeout_remaining = timeout; + do { +#if defined(HAVE_POLL) || defined(HAVE_SELECT) + int sysret; +#endif + + active_fds = 0; + + for(i = 0; i < nfds; i++) { + if (fds[i].events != fds[i].revents) { + switch (fds[i].type) { + case LIBSSH2_POLLFD_CHANNEL: + if ((fds[i].events & LIBSSH2_POLLFD_POLLIN) && + /* Want to be ready for read */ + ((fds[i].revents & LIBSSH2_POLLFD_POLLIN) == 0)) { + /* Not yet known to be ready for read */ + fds[i].revents |= + libssh2_poll_channel_read(fds[i].fd.channel, + 0) ? + LIBSSH2_POLLFD_POLLIN : 0; + } + if ((fds[i].events & LIBSSH2_POLLFD_POLLEXT) && + /* Want to be ready for extended read */ + ((fds[i].revents & LIBSSH2_POLLFD_POLLEXT) == 0)) { + /* Not yet known to be ready for extended read */ + fds[i].revents |= + libssh2_poll_channel_read(fds[i].fd.channel, + 1) ? + LIBSSH2_POLLFD_POLLEXT : 0; + } + if ((fds[i].events & LIBSSH2_POLLFD_POLLOUT) && + /* Want to be ready for write */ + ((fds[i].revents & LIBSSH2_POLLFD_POLLOUT) == 0)) { + /* Not yet known to be ready for write */ + fds[i].revents |= + poll_channel_write(fds[i].fd. channel) ? + LIBSSH2_POLLFD_POLLOUT : 0; + } + if (fds[i].fd.channel->remote.close + || fds[i].fd.channel->local.close) { + fds[i].revents |= LIBSSH2_POLLFD_CHANNEL_CLOSED; + } + if (fds[i].fd.channel->session->socket_state == + LIBSSH2_SOCKET_DISCONNECTED) { + fds[i].revents |= + LIBSSH2_POLLFD_CHANNEL_CLOSED | + LIBSSH2_POLLFD_SESSION_CLOSED; + } + break; + + case LIBSSH2_POLLFD_LISTENER: + if ((fds[i].events & LIBSSH2_POLLFD_POLLIN) && + /* Want a connection */ + ((fds[i].revents & LIBSSH2_POLLFD_POLLIN) == 0)) { + /* No connections known of yet */ + fds[i].revents |= + poll_listener_queued(fds[i].fd. listener) ? + LIBSSH2_POLLFD_POLLIN : 0; + } + if (fds[i].fd.listener->session->socket_state == + LIBSSH2_SOCKET_DISCONNECTED) { + fds[i].revents |= + LIBSSH2_POLLFD_LISTENER_CLOSED | + LIBSSH2_POLLFD_SESSION_CLOSED; + } + break; + } + } + if (fds[i].revents) { + active_fds++; + } + } + + if (active_fds) { + /* Don't block on the sockets if we have channels/listeners which + are ready */ + timeout_remaining = 0; + } +#ifdef HAVE_POLL + +#ifdef HAVE_LIBSSH2_GETTIMEOFDAY + { + struct timeval tv_begin, tv_end; + + _libssh2_gettimeofday((struct timeval *) &tv_begin, NULL); + sysret = poll(sockets, nfds, timeout_remaining); + _libssh2_gettimeofday((struct timeval *) &tv_end, NULL); + timeout_remaining -= (tv_end.tv_sec - tv_begin.tv_sec) * 1000; + timeout_remaining -= (tv_end.tv_usec - tv_begin.tv_usec) / 1000; + } +#else + /* If the platform doesn't support gettimeofday, + * then just make the call non-blocking and walk away + */ + sysret = poll(sockets, nfds, timeout_remaining); + timeout_remaining = 0; +#endif /* HAVE_GETTIMEOFDAY */ + + if (sysret > 0) { + for(i = 0; i < nfds; i++) { + switch (fds[i].type) { + case LIBSSH2_POLLFD_SOCKET: + fds[i].revents = sockets[i].revents; + sockets[i].revents = 0; /* In case we loop again, be nice */ + if (fds[i].revents) { + active_fds++; + } + break; + case LIBSSH2_POLLFD_CHANNEL: + if (sockets[i].events & POLLIN) { + /* Spin session until no data available */ + while (_libssh2_transport_read(fds[i].fd.channel->session) + > 0); + } + if (sockets[i].revents & POLLHUP) { + fds[i].revents |= + LIBSSH2_POLLFD_CHANNEL_CLOSED | + LIBSSH2_POLLFD_SESSION_CLOSED; + } + sockets[i].revents = 0; + break; + case LIBSSH2_POLLFD_LISTENER: + if (sockets[i].events & POLLIN) { + /* Spin session until no data available */ + while (_libssh2_transport_read(fds[i].fd.listener->session) + > 0); + } + if (sockets[i].revents & POLLHUP) { + fds[i].revents |= + LIBSSH2_POLLFD_LISTENER_CLOSED | + LIBSSH2_POLLFD_SESSION_CLOSED; + } + sockets[i].revents = 0; + break; + } + } + } +#elif defined(HAVE_SELECT) + tv.tv_sec = timeout_remaining / 1000; + tv.tv_usec = (timeout_remaining % 1000) * 1000; +#ifdef HAVE_LIBSSH2_GETTIMEOFDAY + { + struct timeval tv_begin, tv_end; + + _libssh2_gettimeofday((struct timeval *) &tv_begin, NULL); + sysret = select(maxfd+1, &rfds, &wfds, NULL, &tv); + _libssh2_gettimeofday((struct timeval *) &tv_end, NULL); + + timeout_remaining -= (tv_end.tv_sec - tv_begin.tv_sec) * 1000; + timeout_remaining -= (tv_end.tv_usec - tv_begin.tv_usec) / 1000; + } +#else + /* If the platform doesn't support gettimeofday, + * then just make the call non-blocking and walk away + */ + sysret = select(maxfd+1, &rfds, &wfds, NULL, &tv); + timeout_remaining = 0; +#endif + + if (sysret > 0) { + for(i = 0; i < nfds; i++) { + switch (fds[i].type) { + case LIBSSH2_POLLFD_SOCKET: + if (FD_ISSET(fds[i].fd.socket, &rfds)) { + fds[i].revents |= LIBSSH2_POLLFD_POLLIN; + } + if (FD_ISSET(fds[i].fd.socket, &wfds)) { + fds[i].revents |= LIBSSH2_POLLFD_POLLOUT; + } + if (fds[i].revents) { + active_fds++; + } + break; + + case LIBSSH2_POLLFD_CHANNEL: + if (FD_ISSET(fds[i].fd.channel->session->socket_fd, &rfds)) { + /* Spin session until no data available */ + while (_libssh2_transport_read(fds[i].fd.channel->session) + > 0); + } + break; + + case LIBSSH2_POLLFD_LISTENER: + if (FD_ISSET + (fds[i].fd.listener->session->socket_fd, &rfds)) { + /* Spin session until no data available */ + while (_libssh2_transport_read(fds[i].fd.listener->session) + > 0); + } + break; + } + } + } +#endif /* else no select() or poll() -- timeout (and by extension + * timeout_remaining) will be equal to 0 */ + } while ((timeout_remaining > 0) && !active_fds); + + return active_fds; +} + +/* + * libssh2_session_block_directions + * + * Get blocked direction when a function returns LIBSSH2_ERROR_EAGAIN + * Returns LIBSSH2_SOCKET_BLOCK_INBOUND if recv() blocked + * or LIBSSH2_SOCKET_BLOCK_OUTBOUND if send() blocked + */ +LIBSSH2_API int +libssh2_session_block_directions(LIBSSH2_SESSION *session) +{ + return session->socket_block_directions; +} + +/* libssh2_session_banner_get + * Get the remote banner (server ID string) + */ + +LIBSSH2_API const char * +libssh2_session_banner_get(LIBSSH2_SESSION *session) +{ + /* to avoid a coredump when session is NULL */ + if (NULL == session) + return NULL; + + if (NULL==session->remote.banner) + return NULL; + + return (const char *) session->remote.banner; +} |