summaryrefslogtreecommitdiff
path: root/Utilities/cmcurl/socks.c
diff options
context:
space:
mode:
Diffstat (limited to 'Utilities/cmcurl/socks.c')
-rw-r--r--Utilities/cmcurl/socks.c585
1 files changed, 585 insertions, 0 deletions
diff --git a/Utilities/cmcurl/socks.c b/Utilities/cmcurl/socks.c
new file mode 100644
index 000000000..3319e697e
--- /dev/null
+++ b/Utilities/cmcurl/socks.c
@@ -0,0 +1,585 @@
+/***************************************************************************
+ * _ _ ____ _
+ * Project ___| | | | _ \| |
+ * / __| | | | |_) | |
+ * | (__| |_| | _ <| |___
+ * \___|\___/|_| \_\_____|
+ *
+ * Copyright (C) 1998 - 2006, 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.
+ *
+ * $Id$
+ ***************************************************************************/
+
+#include "setup.h"
+
+#include <string.h>
+
+#ifdef NEED_MALLOC_H
+#include <malloc.h>
+#endif
+#ifdef HAVE_STDLIB_H
+#include <stdlib.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...
+ */
+static int 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 */
+ long conn_timeout) /* timeout for data wait
+ relative to
+ conn->created */
+{
+ ssize_t nread;
+ ssize_t allread = 0;
+ int result;
+ struct timeval tvnow;
+ long conntime;
+ *n = 0;
+ do {
+ tvnow = Curl_tvnow();
+ /* calculating how long connection is establishing */
+ conntime = Curl_tvdiff(tvnow, conn->created);
+ if(conntime > conn_timeout) {
+ /* we already got the timeout */
+ result = ~CURLE_OK;
+ break;
+ }
+ if(Curl_select(sockfd, CURL_SOCKET_BAD,
+ (int)(conn_timeout - conntime)) <= 0) {
+ result = ~CURLE_OK;
+ break;
+ }
+ result = Curl_read(conn, sockfd, buf, buffersize, &nread);
+ if(result)
+ break;
+
+ if(buffersize == nread) {
+ allread += nread;
+ *n = allread;
+ result = CURLE_OK;
+ break;
+ }
+ buffersize -= nread;
+ buf += nread;
+ allread += nread;
+ } while(1);
+ 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 :
+* Nonsupport "SOCKS 4A (Simple Extension to SOCKS 4 Protocol)"
+* Nonsupport "Identification Protocol (RFC1413)"
+*/
+CURLcode Curl_SOCKS4(const char *proxy_name,
+ struct connectdata *conn)
+{
+ unsigned char socksreq[262]; /* room for SOCKS4 request incl. user id */
+ int result;
+ CURLcode code;
+ curl_socket_t sock = conn->sock[FIRSTSOCKET];
+ long timeout;
+ struct SessionHandle *data = conn->data;
+
+ /* get timeout */
+ if(data->set.timeout && data->set.connecttimeout) {
+ if (data->set.timeout < data->set.connecttimeout)
+ timeout = data->set.timeout*1000;
+ else
+ timeout = data->set.connecttimeout*1000;
+ }
+ else if(data->set.timeout)
+ timeout = data->set.timeout*1000;
+ else if(data->set.connecttimeout)
+ timeout = data->set.connecttimeout*1000;
+ else
+ timeout = DEFAULT_CONNECT_TIMEOUT;
+
+ Curl_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 */
+ *((unsigned short*)&socksreq[2]) = htons(conn->remote_port);
+
+ /* DNS resolve */
+ {
+ struct Curl_dns_entry *dns;
+ Curl_addrinfo *hp=NULL;
+ int rc;
+
+ rc = Curl_resolv(conn, conn->host.name, (int)conn->remote_port, &dns);
+
+ if(rc == CURLRESOLV_ERROR)
+ return CURLE_COULDNT_RESOLVE_PROXY;
+
+ if(rc == CURLRESOLV_PENDING)
+ /* this requires that we're in "wait for resolve" state */
+ rc = Curl_wait_for_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.",
+ conn->host.name);
+ 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;
+ int packetsize = 9 +
+ (int)strlen((char*)socksreq + 8); /* size including NUL */
+
+ /* Send request */
+ code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
+ if ((code != CURLE_OK) || (written != packetsize)) {
+ failf(data, "Failed to send SOCKS4 connect request.");
+ return CURLE_COULDNT_CONNECT;
+ }
+
+ packetsize = 8; /* receive data size */
+
+ /* Receive response */
+ result = blockread_all(conn, sock, (char *)socksreq, packetsize,
+ &actualread, timeout);
+ 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 request granted.\n");
+ 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],
+ (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+ 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],
+ (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+ 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],
+ (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+ 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],
+ (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+ socksreq[1]);
+ return CURLE_COULDNT_CONNECT;
+ }
+ }
+
+ Curl_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,
+ 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[FIRSTSOCKET];
+ struct SessionHandle *data = conn->data;
+ long timeout;
+
+ /* get timeout */
+ if(data->set.timeout && data->set.connecttimeout) {
+ if (data->set.timeout < data->set.connecttimeout)
+ timeout = data->set.timeout*1000;
+ else
+ timeout = data->set.connecttimeout*1000;
+ }
+ else if(data->set.timeout)
+ timeout = data->set.timeout*1000;
+ else if(data->set.connecttimeout)
+ timeout = data->set.connecttimeout*1000;
+ else
+ timeout = DEFAULT_CONNECT_TIMEOUT;
+
+ Curl_nonblock(sock, TRUE);
+
+ /* wait until socket gets connected */
+ result = Curl_select(CURL_SOCKET_BAD, sock, (int)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 & CSELECT_ERR) {
+ failf(conn->data, "SOCKS5: error occured during connection");
+ return CURLE_COULDNT_CONNECT;
+ }
+
+ socksreq[0] = 5; /* version */
+ socksreq[1] = (char)(proxy_name ? 2 : 1); /* number of methods (below) */
+ socksreq[2] = 0; /* no authentication */
+ socksreq[3] = 2; /* username/password */
+
+ Curl_nonblock(sock, FALSE);
+
+ code = Curl_write(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;
+ }
+
+ Curl_nonblock(sock, TRUE);
+
+ result = Curl_select(sock, CURL_SOCKET_BAD, (int)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 & CSELECT_ERR) {
+ failf(conn->data, "SOCKS5 read error occured");
+ return CURLE_RECV_ERROR;
+ }
+
+ Curl_nonblock(sock, FALSE);
+
+ result=blockread_all(conn, sock, (char *)socksreq, 2, &actualread, timeout);
+ 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 */
+ ;
+ }
+ else if (socksreq[1] == 2) {
+ /* Needs user name and password */
+ size_t userlen, pwlen;
+ int len;
+ if(proxy_name && proxy_password) {
+ userlen = strlen(proxy_name);
+ pwlen = proxy_password?strlen(proxy_password):0;
+ }
+ else {
+ userlen = 0;
+ pwlen = 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++] = (char) userlen;
+ memcpy(socksreq + len, proxy_name, (int) userlen);
+ len += userlen;
+ socksreq[len++] = (char) pwlen;
+ memcpy(socksreq + len, proxy_password, (int) pwlen);
+ len += pwlen;
+
+ code = Curl_write(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=blockread_all(conn, sock, (char *)socksreq, 2, &actualread,
+ timeout);
+ 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 (socksreq[1] == 1) {
+ failf(data,
+ "SOCKS5 GSSAPI per-message authentication is not supported.");
+ return CURLE_COULDNT_CONNECT;
+ }
+ else if (socksreq[1] == 255) {
+ 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 */
+ socksreq[0] = 5; /* version (SOCKS5) */
+ socksreq[1] = 1; /* connect */
+ socksreq[2] = 0; /* must be zero */
+ socksreq[3] = 1; /* IPv4 = 1 */
+
+ {
+ struct Curl_dns_entry *dns;
+ Curl_addrinfo *hp=NULL;
+ int rc = Curl_resolv(conn, conn->host.name, (int)conn->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 */
+ rc = Curl_wait_for_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])) {
+ 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 SOCKS5 connect.",
+ conn->host.name);
+ return CURLE_COULDNT_RESOLVE_HOST;
+ }
+ }
+
+ *((unsigned short*)&socksreq[8]) = htons(conn->remote_port);
+
+ {
+ const int packetsize = 10;
+
+ code = Curl_write(conn, sock, (char *)socksreq, packetsize, &written);
+ if ((code != CURLE_OK) || (written != packetsize)) {
+ failf(data, "Failed to send SOCKS5 connect request.");
+ return CURLE_COULDNT_CONNECT;
+ }
+
+ result = blockread_all(conn, sock, (char *)socksreq, packetsize,
+ &actualread, timeout);
+ if ((result != CURLE_OK) || (actualread != packetsize)) {
+ 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 */
+ 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],
+ (unsigned int)ntohs(*(unsigned short*)(&socksreq[8])),
+ socksreq[1]);
+ return CURLE_COULDNT_CONNECT;
+ }
+ }
+
+ Curl_nonblock(sock, TRUE);
+ return CURLE_OK; /* Proxy was successful! */
+}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-13 15:59:44 +0000