mirror of
https://github.com/curl/curl.git
synced 2024-11-27 05:50:21 +08:00
792 lines
25 KiB
C
792 lines
25 KiB
C
/***************************************************************************
|
|
* _ _ ____ _
|
|
* Project ___| | | | _ \| |
|
|
* / __| | | | |_) | |
|
|
* | (__| |_| | _ <| |___
|
|
* \___|\___/|_| \_\_____|
|
|
*
|
|
* Copyright (C) 1998 - 2019, 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 https://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 "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 = 0;
|
|
ssize_t allread = 0;
|
|
int result;
|
|
*n = 0;
|
|
for(;;) {
|
|
timediff_t timeleft = Curl_timeleft(conn->data, NULL, TRUE);
|
|
if(timeleft < 0) {
|
|
/* we already got the timeout */
|
|
result = CURLE_OPERATION_TIMEDOUT;
|
|
break;
|
|
}
|
|
if(SOCKET_READABLE(sockfd, timeleft) <= 0) {
|
|
result = ~CURLE_OK;
|
|
break;
|
|
}
|
|
result = Curl_read_plain(sockfd, buf, buffersize, &nread);
|
|
if(CURLE_AGAIN == result)
|
|
continue;
|
|
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 :
|
|
* https://www.openssh.com/txt/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_user,
|
|
const char *hostname,
|
|
int remote_port,
|
|
int sockindex,
|
|
struct connectdata *conn)
|
|
{
|
|
const bool protocol4a =
|
|
(conn->socks_proxy.proxytype == CURLPROXY_SOCKS4A) ? TRUE : FALSE;
|
|
#define SOCKS4REQLEN 262
|
|
unsigned char socksreq[SOCKS4REQLEN]; /* room for SOCKS4 request incl. user
|
|
id */
|
|
CURLcode code;
|
|
curl_socket_t sock = conn->sock[sockindex];
|
|
struct Curl_easy *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;
|
|
}
|
|
|
|
if(conn->bits.httpproxy)
|
|
infof(conn->data, "SOCKS4%s: connecting to HTTP proxy %s port %d\n",
|
|
protocol4a ? "a" : "", hostname, remote_port);
|
|
|
|
(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];
|
|
Curl_printable_address(hp, buf, sizeof(buf));
|
|
|
|
if(hp->ai_family == AF_INET) {
|
|
struct sockaddr_in *saddr_in;
|
|
|
|
saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
|
|
socksreq[4] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[0];
|
|
socksreq[5] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[1];
|
|
socksreq[6] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[2];
|
|
socksreq[7] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[3];
|
|
|
|
infof(data, "SOCKS4 connect to IPv4 %s (locally resolved)\n", buf);
|
|
}
|
|
else {
|
|
hp = NULL; /* fail! */
|
|
|
|
failf(data, "SOCKS4 connection to %s not supported\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_user) {
|
|
size_t plen = strlen(proxy_user);
|
|
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_user, plen + 1);
|
|
}
|
|
|
|
/*
|
|
* Make connection
|
|
*/
|
|
{
|
|
int result;
|
|
ssize_t actualread;
|
|
ssize_t written;
|
|
ssize_t hostnamelen = 0;
|
|
ssize_t packetsize = 9 +
|
|
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],
|
|
(((unsigned char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
|
|
(unsigned char)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 char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
|
|
(unsigned char)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 char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
|
|
(unsigned char)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 char)socksreq[2] << 8) | (unsigned char)socksreq[3]),
|
|
(unsigned char)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_user,
|
|
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) */
|
|
int idx;
|
|
ssize_t actualread;
|
|
ssize_t written;
|
|
int result;
|
|
CURLcode code;
|
|
curl_socket_t sock = conn->sock[sockindex];
|
|
struct Curl_easy *data = conn->data;
|
|
timediff_t timeout;
|
|
bool socks5_resolve_local =
|
|
(conn->socks_proxy.proxytype == CURLPROXY_SOCKS5) ? TRUE : FALSE;
|
|
const size_t hostname_len = strlen(hostname);
|
|
ssize_t len = 0;
|
|
const unsigned long auth = data->set.socks5auth;
|
|
bool allow_gssapi = FALSE;
|
|
|
|
if(conn->bits.httpproxy)
|
|
infof(conn->data, "SOCKS5: connecting to HTTP proxy %s port %d\n",
|
|
hostname, remote_port);
|
|
|
|
/* 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 = SOCKET_WRITABLE(sock, timeout);
|
|
|
|
if(-1 == result) {
|
|
failf(conn->data, "SOCKS5: no connection here");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
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;
|
|
}
|
|
|
|
if(auth & ~(CURLAUTH_BASIC | CURLAUTH_GSSAPI))
|
|
infof(conn->data,
|
|
"warning: unsupported value passed to CURLOPT_SOCKS5_AUTH: %lu\n",
|
|
auth);
|
|
if(!(auth & CURLAUTH_BASIC))
|
|
/* disable username/password auth */
|
|
proxy_user = NULL;
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
if(auth & CURLAUTH_GSSAPI)
|
|
allow_gssapi = TRUE;
|
|
#endif
|
|
|
|
idx = 0;
|
|
socksreq[idx++] = 5; /* version */
|
|
idx++; /* reserve for the number of authentication methods */
|
|
socksreq[idx++] = 0; /* no authentication */
|
|
if(allow_gssapi)
|
|
socksreq[idx++] = 1; /* GSS-API */
|
|
if(proxy_user)
|
|
socksreq[idx++] = 2; /* username/password */
|
|
/* write the number of authentication methods */
|
|
socksreq[1] = (unsigned char) (idx - 2);
|
|
|
|
(void)curlx_nonblock(sock, FALSE);
|
|
|
|
infof(data, "SOCKS5 communication to %s:%d\n", hostname, remote_port);
|
|
|
|
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 = SOCKET_READABLE(sock, timeout);
|
|
|
|
if(-1 == result) {
|
|
failf(conn->data, "SOCKS5 nothing to read");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
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(allow_gssapi && (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_user_len, proxy_password_len;
|
|
if(proxy_user && proxy_password) {
|
|
proxy_user_len = strlen(proxy_user);
|
|
proxy_password_len = strlen(proxy_password);
|
|
}
|
|
else {
|
|
proxy_user_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_user_len;
|
|
if(proxy_user && proxy_user_len)
|
|
memcpy(socksreq + len, proxy_user, proxy_user_len);
|
|
len += proxy_user_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(!allow_gssapi && (socksreq[1] == 1)) {
|
|
failf(data,
|
|
"SOCKS5 GSSAPI per-message authentication is not supported.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
if(socksreq[1] == 255) {
|
|
if(!proxy_user || !*proxy_user) {
|
|
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) {
|
|
char buf[64];
|
|
Curl_printable_address(hp, buf, sizeof(buf));
|
|
|
|
if(hp->ai_family == AF_INET) {
|
|
int i;
|
|
struct sockaddr_in *saddr_in;
|
|
socksreq[len++] = 1; /* ATYP: IPv4 = 1 */
|
|
|
|
saddr_in = (struct sockaddr_in *)(void *)hp->ai_addr;
|
|
for(i = 0; i < 4; i++) {
|
|
socksreq[len++] = ((unsigned char *)&saddr_in->sin_addr.s_addr)[i];
|
|
}
|
|
|
|
infof(data, "SOCKS5 connect to IPv4 %s (locally resolved)\n", buf);
|
|
}
|
|
#ifdef ENABLE_IPV6
|
|
else if(hp->ai_family == AF_INET6) {
|
|
int i;
|
|
struct sockaddr_in6 *saddr_in6;
|
|
socksreq[len++] = 4; /* ATYP: IPv6 = 4 */
|
|
|
|
saddr_in6 = (struct sockaddr_in6 *)(void *)hp->ai_addr;
|
|
for(i = 0; i < 16; i++) {
|
|
socksreq[len++] =
|
|
((unsigned char *)&saddr_in6->sin6_addr.s6_addr)[i];
|
|
}
|
|
|
|
infof(data, "SOCKS5 connect to IPv6 %s (locally resolved)\n", buf);
|
|
}
|
|
#endif
|
|
else {
|
|
hp = NULL; /* fail! */
|
|
|
|
failf(data, "SOCKS5 connection to %s not supported\n", buf);
|
|
}
|
|
|
|
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;
|
|
}
|
|
|
|
/* 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) {
|
|
result = Curl_blockread_all(conn, sock, (char *)&socksreq[10],
|
|
len - 10, &actualread);
|
|
if(result || ((len - 10) != actualread)) {
|
|
failf(data, "Failed to receive SOCKS5 connect request ack.");
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
}
|
|
#if defined(HAVE_GSSAPI) || defined(USE_WINDOWS_SSPI)
|
|
}
|
|
#endif
|
|
|
|
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],
|
|
(((unsigned char)socksreq[8] << 8) |
|
|
(unsigned char)socksreq[9]),
|
|
(unsigned char)socksreq[1]);
|
|
}
|
|
else if(socksreq[3] == 3) {
|
|
unsigned char port_upper = (unsigned char)socksreq[len - 2];
|
|
socksreq[len - 2] = 0;
|
|
failf(data,
|
|
"Can't complete SOCKS5 connection to %s:%d. (%d)",
|
|
(char *)&socksreq[5],
|
|
((port_upper << 8) |
|
|
(unsigned char)socksreq[len - 1]),
|
|
(unsigned char)socksreq[1]);
|
|
socksreq[len - 2] = port_upper;
|
|
}
|
|
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],
|
|
(((unsigned char)socksreq[20] << 8) |
|
|
(unsigned char)socksreq[21]),
|
|
(unsigned char)socksreq[1]);
|
|
}
|
|
return CURLE_COULDNT_CONNECT;
|
|
}
|
|
infof(data, "SOCKS5 request granted.\n");
|
|
|
|
(void)curlx_nonblock(sock, TRUE);
|
|
return CURLE_OK; /* Proxy was successful! */
|
|
}
|
|
|
|
#endif /* CURL_DISABLE_PROXY */
|