diff options
Diffstat (limited to 'libcurl/src/lib/socks.c')
| -rw-r--r-- | libcurl/src/lib/socks.c | 755 |
1 files changed, 755 insertions, 0 deletions
diff --git a/libcurl/src/lib/socks.c b/libcurl/src/lib/socks.c new file mode 100644 index 0000000..9dfe097 --- /dev/null +++ b/libcurl/src/lib/socks.c @@ -0,0 +1,755 @@ +/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2015, 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)"
+*/
+CURL_STATIC 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;
+ }
+
+ (void)curlx_nonblock(sock, FALSE);
+
+ infof(data, "SOCKS4 communication to %s:%d\n", hostname, remote_port);
+
+ /*
+ * 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! */
+
+ infof(data, "SOCKS4 connect to %s (locally resolved)\n", buf);
+
+ 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) {
+ size_t plen = strlen(proxy_name);
+ if(plen >= sizeof(socksreq) - 8) {
+ failf(data, "Too long SOCKS proxy name, can't use!\n");
+ return CURLE_COULDNT_CONNECT;
+ }
+ /* copy the proxy name WITH trailing zero */
+ memcpy(socksreq + 8, proxy_name, plen+1);
+ }
+
+ /*
+ * 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 || (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 || (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 || (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;
+ }
+ }
+
+ (void)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;
+ }
+
+ (void)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; /* GSS-API */
+ 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
+
+ (void)curlx_nonblock(sock, FALSE);
+
+ code = Curl_write_plain(conn, sock, (char *)socksreq, (2 + (int)socksreq[1]),
+ &written);
+ if(code || (written != (2 + (int)socksreq[1]))) {
+ failf(data, "Unable to send initial SOCKS5 request.");
+ return CURLE_COULDNT_CONNECT;
+ }
+
+ (void)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;
+ }
+
+ (void)curlx_nonblock(sock, FALSE);
+
+ result=Curl_blockread_all(conn, sock, (char *)socksreq, 2, &actualread);
+ if(result || (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) {
+ failf(data, "Unable to negotiate SOCKS5 GSS-API 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 || (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 || (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)
+ 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 GSS-API protection not yet implemented.");
+ }
+ else
+#endif
+ code = Curl_write_plain(conn, sock, (char *)socksreq, len, &written);
+
+ if(code || (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 GSS-API protection not yet implemented.");
+ }
+ else
+#endif
+ result = Curl_blockread_all(conn, sock, (char *)socksreq,
+ len, &actualread);
+
+ if(result || (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 || (len != actualread)) {
+ failf(data, "Failed to receive SOCKS5 connect request ack.");
+ return CURLE_COULDNT_CONNECT;
+ }
+ }
+#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
+ }
+#endif
+
+ (void)curlx_nonblock(sock, TRUE);
+ return CURLE_OK; /* Proxy was successful! */
+}
+
+#endif /* CURL_DISABLE_PROXY */
+
|