curl folder renamed

git-svn-id: http://svn.miranda-ng.org/main/trunk@6858 1316c22d-e87f-b044-9b9b-93d7a3e3ba9c

1 files changed, 744 insertions, 0 deletions

diff --git a/plugins/FTPFileYM/curl/lib/socks.c b/plugins/FTPFileYM/curl/lib/socks.c
new file mode 100644
index 0000000000..51bb946643
--- /dev/null
+++ b/plugins/FTPFileYM/curl/lib/socks.c
@@ -0,0 +1,744 @@
+/***************************************************************************
+ *                                  _   _ ____  _
+ *  Project                     ___| | | |  _ \| |
+ *                             / __| | | | |_) | |
+ *                            | (__| |_| |  _ <| |___
+ *                             \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2012, Daniel Stenberg, <daniel@haxx.se>, et al.
+ *
+ * This software is licensed as described in the file COPYING, which
+ * you should have received as part of this distribution. The terms
+ * are also available at http://curl.haxx.se/docs/copyright.html.
+ *
+ * You may opt to use, copy, modify, merge, publish, distribute and/or sell
+ * copies of the Software, and permit persons to whom the Software is
+ * furnished to do so, under the terms of the COPYING file.
+ *
+ * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY
+ * KIND, either express or implied.
+ *
+ ***************************************************************************/
+
+#include "curl_setup.h"
+
+#if !defined(CURL_DISABLE_PROXY)
+
+#ifdef HAVE_NETINET_IN_H
+#include <netinet/in.h>
+#endif
+#ifdef HAVE_ARPA_INET_H
+#include <arpa/inet.h>
+#endif
+
+#include "urldata.h"
+#include "sendf.h"
+#include "strequal.h"
+#include "select.h"
+#include "connect.h"
+#include "timeval.h"
+#include "socks.h"
+
+/* The last #include file should be: */
+#include "memdebug.h"
+
+/*
+ * Helper read-from-socket functions. Does the same as Curl_read() but it
+ * blocks until all bytes amount of buffersize will be read. No more, no less.
+ *
+ * This is STUPID BLOCKING behaviour which we frown upon, but right now this
+ * is what we have...
+ */
+int Curl_blockread_all(struct connectdata *conn, /* connection data */
+                       curl_socket_t sockfd,     /* read from this socket */
+                       char *buf,                /* store read data here */
+                       ssize_t buffersize,       /* max amount to read */
+                       ssize_t *n)               /* amount bytes read */
+{
+  ssize_t nread;
+  ssize_t allread = 0;
+  int result;
+  long timeleft;
+  *n = 0;
+  for(;;) {
+    timeleft = Curl_timeleft(conn->data, NULL, TRUE);
+    if(timeleft < 0) {
+      /* we already got the timeout */
+      result = CURLE_OPERATION_TIMEDOUT;
+      break;
+    }
+    if(Curl_socket_ready(sockfd, CURL_SOCKET_BAD, timeleft) <= 0) {
+      result = ~CURLE_OK;
+      break;
+    }
+    result = Curl_read_plain(sockfd, buf, buffersize, &nread);
+    if(CURLE_AGAIN == result)
+      continue;
+    else if(result)
+      break;
+
+    if(buffersize == nread) {
+      allread += nread;
+      *n = allread;
+      result = CURLE_OK;
+      break;
+    }
+    if(!nread) {
+      result = ~CURLE_OK;
+      break;
+    }
+
+    buffersize -= nread;
+    buf += nread;
+    allread += nread;
+  }
+  return result;
+}
+
+/*
+* This function logs in to a SOCKS4 proxy and sends the specifics to the final
+* destination server.
+*
+* Reference :
+*   http://socks.permeo.com/protocol/socks4.protocol
+*
+* Note :
+*   Set protocol4a=true for  "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
+*   Nonsupport "Identification Protocol (RFC1413)"
+*/
+CURLcode Curl_SOCKS4(const char *proxy_name,
+                     const char *hostname,
+                     int remote_port,
+                     int sockindex,
+                     struct connectdata *conn,
+                     bool protocol4a)
+{
+#define SOCKS4REQLEN 262
+  unsigned char socksreq[SOCKS4REQLEN]; /* room for SOCKS4 request incl. user
+                                           id */
+  int result;
+  CURLcode code;
+  curl_socket_t sock = conn->sock[sockindex];
+  struct SessionHandle *data = conn->data;
+
+  if(Curl_timeleft(data, NULL, TRUE) < 0) {
+    /* time-out, bail out, go home */
+    failf(data, "Connection time-out");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  curlx_nonblock(sock, FALSE);
+
+  /*
+   * Compose socks4 request
+   *
+   * Request format
+   *
+   *     +----+----+----+----+----+----+----+----+----+----+....+----+
+   *     | VN | CD | DSTPORT |      DSTIP        | USERID       |NULL|
+   *     +----+----+----+----+----+----+----+----+----+----+....+----+
+   * # of bytes:  1    1      2              4           variable       1
+   */
+
+  socksreq[0] = 4; /* version (SOCKS4) */
+  socksreq[1] = 1; /* connect */
+  socksreq[2] = (unsigned char)((remote_port >> 8) & 0xff); /* PORT MSB */
+  socksreq[3] = (unsigned char)(remote_port & 0xff);        /* PORT LSB */
+
+  /* DNS resolve only for SOCKS4, not SOCKS4a */
+  if(!protocol4a) {
+    struct Curl_dns_entry *dns;
+    Curl_addrinfo *hp=NULL;
+    int rc;
+
+    rc = Curl_resolv(conn, hostname, remote_port, &dns);
+
+    if(rc == CURLRESOLV_ERROR)
+      return CURLE_COULDNT_RESOLVE_PROXY;
+
+    if(rc == CURLRESOLV_PENDING)
+      /* ignores the return code, but 'dns' remains NULL on failure */
+      (void)Curl_resolver_wait_resolv(conn, &dns);
+
+    /*
+     * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
+     * returns a Curl_addrinfo pointer that may not always look the same.
+     */
+    if(dns)
+      hp=dns->addr;
+    if(hp) {
+      char buf[64];
+      unsigned short ip[4];
+      Curl_printable_address(hp, buf, sizeof(buf));
+
+      if(4 == sscanf( buf, "%hu.%hu.%hu.%hu",
+                      &ip[0], &ip[1], &ip[2], &ip[3])) {
+        /* Set DSTIP */
+        socksreq[4] = (unsigned char)ip[0];
+        socksreq[5] = (unsigned char)ip[1];
+        socksreq[6] = (unsigned char)ip[2];
+        socksreq[7] = (unsigned char)ip[3];
+      }
+      else
+        hp = NULL; /* fail! */
+
+      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
+
+    }
+    if(!hp) {
+      failf(data, "Failed to resolve \"%s\" for SOCKS4 connect.",
+            hostname);
+      return CURLE_COULDNT_RESOLVE_HOST;
+    }
+  }
+
+  /*
+   * This is currently not supporting "Identification Protocol (RFC1413)".
+   */
+  socksreq[8] = 0; /* ensure empty userid is NUL-terminated */
+  if(proxy_name)
+    strlcat((char*)socksreq + 8, proxy_name, sizeof(socksreq) - 8);
+
+  /*
+   * Make connection
+   */
+  {
+    ssize_t actualread;
+    ssize_t written;
+    ssize_t hostnamelen = 0;
+    int packetsize = 9 +
+      (int)strlen((char*)socksreq + 8); /* size including NUL */
+
+    /* If SOCKS4a, set special invalid IP address 0.0.0.x */
+    if(protocol4a) {
+      socksreq[4] = 0;
+      socksreq[5] = 0;
+      socksreq[6] = 0;
+      socksreq[7] = 1;
+      /* If still enough room in buffer, also append hostname */
+      hostnamelen = (ssize_t)strlen(hostname) + 1; /* length including NUL */
+      if(packetsize + hostnamelen <= SOCKS4REQLEN)
+        strcpy((char*)socksreq + packetsize, hostname);
+      else
+        hostnamelen = 0; /* Flag: hostname did not fit in buffer */
+    }
+
+    /* Send request */
+    code = Curl_write_plain(conn, sock, (char *)socksreq,
+                            packetsize + hostnamelen,
+                            &written);
+    if((code != CURLE_OK) || (written != packetsize + hostnamelen)) {
+      failf(data, "Failed to send SOCKS4 connect request.");
+      return CURLE_COULDNT_CONNECT;
+    }
+    if(protocol4a && hostnamelen == 0) {
+      /* SOCKS4a with very long hostname - send that name separately */
+      hostnamelen = (ssize_t)strlen(hostname) + 1;
+      code = Curl_write_plain(conn, sock, (char *)hostname, hostnamelen,
+                              &written);
+      if((code != CURLE_OK) || (written != hostnamelen)) {
+        failf(data, "Failed to send SOCKS4 connect request.");
+        return CURLE_COULDNT_CONNECT;
+      }
+    }
+
+    packetsize = 8; /* receive data size */
+
+    /* Receive response */
+    result = Curl_blockread_all(conn, sock, (char *)socksreq, packetsize,
+                                &actualread);
+    if((result != CURLE_OK) || (actualread != packetsize)) {
+      failf(data, "Failed to receive SOCKS4 connect request ack.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /*
+     * Response format
+     *
+     *     +----+----+----+----+----+----+----+----+
+     *     | VN | CD | DSTPORT |      DSTIP        |
+     *     +----+----+----+----+----+----+----+----+
+     * # of bytes:  1    1      2              4
+     *
+     * VN is the version of the reply code and should be 0. CD is the result
+     * code with one of the following values:
+     *
+     * 90: request granted
+     * 91: request rejected or failed
+     * 92: request rejected because SOCKS server cannot connect to
+     *     identd on the client
+     * 93: request rejected because the client program and identd
+     *     report different user-ids
+     */
+
+    /* wrong version ? */
+    if(socksreq[0] != 0) {
+      failf(data,
+            "SOCKS4 reply has wrong version, version should be 4.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* Result */
+    switch(socksreq[1]) {
+    case 90:
+      infof(data, "SOCKS4%s request granted.\n", protocol4a?"a":"");
+      break;
+    case 91:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected or failed.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    case 92:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected because SOCKS server cannot connect to "
+            "identd on the client.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    case 93:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", request rejected because the client program and identd "
+            "report different user-ids.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    default:
+      failf(data,
+            "Can't complete SOCKS4 connection to %d.%d.%d.%d:%d. (%d)"
+            ", Unknown.",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    }
+  }
+
+  curlx_nonblock(sock, TRUE);
+
+  return CURLE_OK; /* Proxy was successful! */
+}
+
+/*
+ * This function logs in to a SOCKS5 proxy and sends the specifics to the final
+ * destination server.
+ */
+CURLcode Curl_SOCKS5(const char *proxy_name,
+                     const char *proxy_password,
+                     const char *hostname,
+                     int remote_port,
+                     int sockindex,
+                     struct connectdata *conn)
+{
+  /*
+    According to the RFC1928, section "6.  Replies". This is what a SOCK5
+    replies:
+
+        +----+-----+-------+------+----------+----------+
+        |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
+        +----+-----+-------+------+----------+----------+
+        | 1  |  1  | X'00' |  1   | Variable |    2     |
+        +----+-----+-------+------+----------+----------+
+
+    Where:
+
+    o  VER    protocol version: X'05'
+    o  REP    Reply field:
+    o  X'00' succeeded
+  */
+
+  unsigned char socksreq[600]; /* room for large user/pw (255 max each) */
+  ssize_t actualread;
+  ssize_t written;
+  int result;
+  CURLcode code;
+  curl_socket_t sock = conn->sock[sockindex];
+  struct SessionHandle *data = conn->data;
+  long timeout;
+  bool socks5_resolve_local = (conn->proxytype == CURLPROXY_SOCKS5)?TRUE:FALSE;
+  const size_t hostname_len = strlen(hostname);
+  ssize_t len = 0;
+
+  /* RFC1928 chapter 5 specifies max 255 chars for domain name in packet */
+  if(!socks5_resolve_local && hostname_len > 255) {
+    infof(conn->data,"SOCKS5: server resolving disabled for hostnames of "
+          "length > 255 [actual len=%zu]\n", hostname_len);
+    socks5_resolve_local = TRUE;
+  }
+
+  /* get timeout */
+  timeout = Curl_timeleft(data, NULL, TRUE);
+
+  if(timeout < 0) {
+    /* time-out, bail out, go home */
+    failf(data, "Connection time-out");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  curlx_nonblock(sock, TRUE);
+
+  /* wait until socket gets connected */
+  result = Curl_socket_ready(CURL_SOCKET_BAD, sock, timeout);
+
+  if(-1 == result) {
+    failf(conn->data, "SOCKS5: no connection here");
+    return CURLE_COULDNT_CONNECT;
+  }
+  else if(0 == result) {
+    failf(conn->data, "SOCKS5: connection timeout");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  if(result & CURL_CSELECT_ERR) {
+    failf(conn->data, "SOCKS5: error occurred during connection");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  socksreq[0] = 5; /* version */
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  socksreq[1] = (char)(proxy_name ? 3 : 2); /* number of methods (below) */
+  socksreq[2] = 0; /* no authentication */
+  socksreq[3] = 1; /* gssapi */
+  socksreq[4] = 2; /* username/password */
+#else
+  socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
+  socksreq[2] = 0; /* no authentication */
+  socksreq[3] = 2; /* username/password */
+#endif
+
+  curlx_nonblock(sock, FALSE);
+
+  code = Curl_write_plain(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
+                          &written);
+  if((code != CURLE_OK) || (written != (2 + (int)socksreq[1]))) {
+    failf(data, "Unable to send initial SOCKS5 request.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  curlx_nonblock(sock, TRUE);
+
+  result = Curl_socket_ready(sock, CURL_SOCKET_BAD, timeout);
+
+  if(-1 == result) {
+    failf(conn->data, "SOCKS5 nothing to read");
+    return CURLE_COULDNT_CONNECT;
+  }
+  else if(0 == result) {
+    failf(conn->data, "SOCKS5 read timeout");
+    return CURLE_OPERATION_TIMEDOUT;
+  }
+
+  if(result & CURL_CSELECT_ERR) {
+    failf(conn->data, "SOCKS5 read error occurred");
+    return CURLE_RECV_ERROR;
+  }
+
+  curlx_nonblock(sock, FALSE);
+
+  result=Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread);
+  if((result != CURLE_OK) || (actualread != 2)) {
+    failf(data, "Unable to receive initial SOCKS5 response.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  if(socksreq[0] != 5) {
+    failf(data, "Received invalid version in initial SOCKS5 response.");
+    return CURLE_COULDNT_CONNECT;
+  }
+  if(socksreq[1] == 0) {
+    /* Nothing to do, no authentication needed */
+    ;
+  }
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  else if(socksreq[1] == 1) {
+    code = Curl_SOCKS5_gssapi_negotiate(sockindex, conn);
+    if(code != CURLE_OK) {
+      failf(data, "Unable to negotiate SOCKS5 gssapi context.");
+      return CURLE_COULDNT_CONNECT;
+    }
+  }
+#endif
+  else if(socksreq[1] == 2) {
+    /* Needs user name and password */
+    size_t proxy_name_len, proxy_password_len;
+    if(proxy_name && proxy_password) {
+      proxy_name_len = strlen(proxy_name);
+      proxy_password_len = strlen(proxy_password);
+    }
+    else {
+      proxy_name_len = 0;
+      proxy_password_len = 0;
+    }
+
+    /*   username/password request looks like
+     * +----+------+----------+------+----------+
+     * |VER | ULEN |  UNAME   | PLEN |  PASSWD  |
+     * +----+------+----------+------+----------+
+     * | 1  |  1   | 1 to 255 |  1   | 1 to 255 |
+     * +----+------+----------+------+----------+
+     */
+    len = 0;
+    socksreq[len++] = 1;    /* username/pw subnegotiation version */
+    socksreq[len++] = (unsigned char) proxy_name_len;
+    if(proxy_name && proxy_name_len)
+      memcpy(socksreq + len, proxy_name, proxy_name_len);
+    len += proxy_name_len;
+    socksreq[len++] = (unsigned char) proxy_password_len;
+    if(proxy_password && proxy_password_len)
+      memcpy(socksreq + len, proxy_password, proxy_password_len);
+    len += proxy_password_len;
+
+    code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
+    if((code != CURLE_OK) || (len != written)) {
+      failf(data, "Failed to send SOCKS5 sub-negotiation request.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    result=Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread);
+    if((result != CURLE_OK) || (actualread != 2)) {
+      failf(data, "Unable to receive SOCKS5 sub-negotiation response.");
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* ignore the first (VER) byte */
+    if(socksreq[1] != 0) { /* status */
+      failf(data, "User was rejected by the SOCKS5 server (%d %d).",
+            socksreq[0], socksreq[1]);
+      return CURLE_COULDNT_CONNECT;
+    }
+
+    /* Everything is good so far, user was authenticated! */
+  }
+  else {
+    /* error */
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+    if(socksreq[1] == 255) {
+#else
+    if(socksreq[1] == 1) {
+      failf(data,
+            "SOCKS5 GSSAPI per-message authentication is not supported.");
+      return CURLE_COULDNT_CONNECT;
+    }
+    else if(socksreq[1] == 255) {
+#endif
+      if(!proxy_name || !*proxy_name) {
+        failf(data,
+              "No authentication method was acceptable. (It is quite likely"
+              " that the SOCKS5 server wanted a username/password, since none"
+              " was supplied to the server on this connection.)");
+      }
+      else {
+        failf(data, "No authentication method was acceptable.");
+      }
+      return CURLE_COULDNT_CONNECT;
+    }
+    else {
+      failf(data,
+            "Undocumented SOCKS5 mode attempted to be used by server.");
+      return CURLE_COULDNT_CONNECT;
+    }
+  }
+
+  /* Authentication is complete, now specify destination to the proxy */
+  len = 0;
+  socksreq[len++] = 5; /* version (SOCKS5) */
+  socksreq[len++] = 1; /* connect */
+  socksreq[len++] = 0; /* must be zero */
+
+  if(!socks5_resolve_local) {
+    socksreq[len++] = 3; /* ATYP: domain name = 3 */
+    socksreq[len++] = (char) hostname_len; /* address length */
+    memcpy(&socksreq[len], hostname, hostname_len); /* address str w/o NULL */
+    len += hostname_len;
+  }
+  else {
+    struct Curl_dns_entry *dns;
+    Curl_addrinfo *hp = NULL;
+    int rc = Curl_resolv(conn, hostname, remote_port, &dns);
+
+    if(rc == CURLRESOLV_ERROR)
+      return CURLE_COULDNT_RESOLVE_HOST;
+
+    if(rc == CURLRESOLV_PENDING) {
+      /* this requires that we're in "wait for resolve" state */
+      code = Curl_resolver_wait_resolv(conn, &dns);
+      if(code != CURLE_OK)
+        return code;
+    }
+
+    /*
+     * We cannot use 'hostent' as a struct that Curl_resolv() returns.  It
+     * returns a Curl_addrinfo pointer that may not always look the same.
+     */
+    if(dns)
+      hp=dns->addr;
+    if(hp) {
+      struct sockaddr_in *saddr_in;
+#ifdef ENABLE_IPV6
+      struct sockaddr_in6 *saddr_in6;
+#endif
+      int i;
+
+      if(hp->ai_family == AF_INET) {
+        socksreq[len++] = 1; /* ATYP: IPv4 = 1 */
+
+        saddr_in = (struct sockaddr_in*)hp->ai_addr;
+        for(i = 0; i < 4; i++) {
+          socksreq[len++] = ((unsigned char*)&saddr_in->sin_addr.s_addr)[i];
+          infof(data, "%d\n", socksreq[len-1]);
+        }
+      }
+#ifdef ENABLE_IPV6
+      else if(hp->ai_family == AF_INET6) {
+        socksreq[len++] = 4; /* ATYP: IPv6 = 4 */
+
+        saddr_in6 = (struct sockaddr_in6*)hp->ai_addr;
+        for(i = 0; i < 16; i++) {
+          socksreq[len++] = ((unsigned char*)&saddr_in6->sin6_addr.s6_addr)[i];
+        }
+      }
+#endif
+      else
+        hp = NULL; /* fail! */
+
+      Curl_resolv_unlock(data, dns); /* not used anymore from now on */
+    }
+    if(!hp) {
+      failf(data, "Failed to resolve \"%s\" for SOCKS5 connect.",
+            hostname);
+      return CURLE_COULDNT_RESOLVE_HOST;
+    }
+  }
+
+  socksreq[len++] = (unsigned char)((remote_port >> 8) & 0xff); /* PORT MSB */
+  socksreq[len++] = (unsigned char)(remote_port & 0xff);        /* PORT LSB */
+
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  if(conn->socks5_gssapi_enctype) {
+    failf(data, "SOCKS5 gssapi protection not yet implemented.");
+  }
+  else
+#endif
+    code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
+
+  if((code != CURLE_OK) || (len != written)) {
+    failf(data, "Failed to send SOCKS5 connect request.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  len = 10; /* minimum packet size is 10 */
+
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  if(conn->socks5_gssapi_enctype) {
+    failf(data, "SOCKS5 gssapi protection not yet implemented.");
+  }
+  else
+#endif
+    result = Curl_blockread_all(conn, sock, (char *)socksreq,
+                                len, &actualread);
+
+  if((result != CURLE_OK) || (len != actualread)) {
+    failf(data, "Failed to receive SOCKS5 connect request ack.");
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  if(socksreq[0] != 5) { /* version */
+    failf(data,
+          "SOCKS5 reply has wrong version, version should be 5.");
+    return CURLE_COULDNT_CONNECT;
+  }
+  if(socksreq[1] != 0) { /* Anything besides 0 is an error */
+    if(socksreq[3] == 1) {
+      failf(data,
+            "Can't complete SOCKS5 connection to %d.%d.%d.%d:%d. (%d)",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+    }
+    else if(socksreq[3] == 3) {
+      failf(data,
+            "Can't complete SOCKS5 connection to %s:%d. (%d)",
+            hostname,
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+    }
+    else if(socksreq[3] == 4) {
+      failf(data,
+            "Can't complete SOCKS5 connection to %02x%02x:%02x%02x:"
+            "%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%02x%02x:%d. (%d)",
+            (unsigned char)socksreq[4], (unsigned char)socksreq[5],
+            (unsigned char)socksreq[6], (unsigned char)socksreq[7],
+            (unsigned char)socksreq[8], (unsigned char)socksreq[9],
+            (unsigned char)socksreq[10], (unsigned char)socksreq[11],
+            (unsigned char)socksreq[12], (unsigned char)socksreq[13],
+            (unsigned char)socksreq[14], (unsigned char)socksreq[15],
+            (unsigned char)socksreq[16], (unsigned char)socksreq[17],
+            (unsigned char)socksreq[18], (unsigned char)socksreq[19],
+            ((socksreq[8] << 8) | socksreq[9]),
+            socksreq[1]);
+    }
+    return CURLE_COULDNT_CONNECT;
+  }
+
+  /* Fix: in general, returned BND.ADDR is variable length parameter by RFC
+     1928, so the reply packet should be read until the end to avoid errors at
+     subsequent protocol level.
+
+    +----+-----+-------+------+----------+----------+
+    |VER | REP |  RSV  | ATYP | BND.ADDR | BND.PORT |
+    +----+-----+-------+------+----------+----------+
+    | 1  |  1  | X'00' |  1   | Variable |    2     |
+    +----+-----+-------+------+----------+----------+
+
+     ATYP:
+     o  IP v4 address: X'01', BND.ADDR = 4 byte
+     o  domain name:  X'03', BND.ADDR = [ 1 byte length, string ]
+     o  IP v6 address: X'04', BND.ADDR = 16 byte
+     */
+
+  /* Calculate real packet size */
+  if(socksreq[3] == 3) {
+    /* domain name */
+    int addrlen = (int) socksreq[4];
+    len = 5 + addrlen + 2;
+  }
+  else if(socksreq[3] == 4) {
+    /* IPv6 */
+    len = 4 + 16 + 2;
+  }
+
+  /* At this point we already read first 10 bytes */
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  if(!conn->socks5_gssapi_enctype) {
+    /* decrypt_gssapi_blockread already read the whole packet */
+#endif
+    if(len > 10) {
+      len -= 10;
+      result = Curl_blockread_all(conn, sock, (char *)&socksreq[10],
+                                  len, &actualread);
+      if((result != CURLE_OK) || (len != actualread)) {
+        failf(data, "Failed to receive SOCKS5 connect request ack.");
+        return CURLE_COULDNT_CONNECT;
+      }
+    }
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+  }
+#endif
+
+  curlx_nonblock(sock, TRUE);
+  return CURLE_OK; /* Proxy was successful! */
+}
+
+#endif /* CURL_DISABLE_PROXY */
+