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/*
* LibSylph -- E-Mail client library
* Copyright (C) 1999-2014 Hiroyuki Yamamoto
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with this library; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifdef HAVE_CONFIG_H
# include "config.h"
#endif
#include <glib.h>
#ifdef G_OS_WIN32
# include <winsock2.h>
# include <ws2tcpip.h>
#endif
#include "socket.h"
#include "socks.h"
#include "utils.h"
SocksInfo *socks_info_new(SocksType type, const gchar *proxy_host,
gushort proxy_port, const gchar *proxy_name,
const gchar *proxy_pass)
{
SocksInfo *socks_info;
socks_info = g_new0(SocksInfo, 1);
socks_info->type = type;
socks_info->proxy_host = g_strdup(proxy_host);
socks_info->proxy_port = proxy_port;
socks_info->proxy_name = g_strdup(proxy_name);
socks_info->proxy_pass = g_strdup(proxy_pass);
return socks_info;
}
void socks_info_free(SocksInfo *socks_info)
{
if (!socks_info)
return;
g_free(socks_info->proxy_host);
g_free(socks_info->proxy_name);
g_free(socks_info->proxy_pass);
g_free(socks_info);
}
gint socks_connect(SockInfo *sock, const gchar *hostname, gushort port,
SocksInfo *socks_info)
{
g_return_val_if_fail(sock != NULL, -1);
g_return_val_if_fail(hostname != NULL, -1);
g_return_val_if_fail(socks_info != NULL, -1);
debug_print("socks_connect: connect to %s:%u via %s:%u\n",
hostname, port,
socks_info->proxy_host, socks_info->proxy_port);
if (socks_info->type == SOCKS_SOCKS5)
return socks5_connect(sock, hostname, port,
socks_info->proxy_name,
socks_info->proxy_pass);
else if (socks_info->type == SOCKS_SOCKS4)
return socks4_connect(sock, hostname, port);
else
g_warning("socks_connect: unknown SOCKS type: %d\n",
socks_info->type);
return -1;
}
gint socks4_connect(SockInfo *sock, const gchar *hostname, gushort port)
{
guchar socks_req[1024];
struct hostent *hp;
g_return_val_if_fail(sock != NULL, -1);
g_return_val_if_fail(hostname != NULL, -1);
debug_print("socks4_connect: connect to %s:%u\n", hostname, port);
socks_req[0] = 4;
socks_req[1] = 1;
*((gushort *)(socks_req + 2)) = htons(port);
/* lookup */
if ((hp = my_gethostbyname(hostname)) == NULL) {
g_warning("socks4_connect: cannot lookup host: %s", hostname);
return -1;
}
if (hp->h_length != 4) {
g_warning("socks4_connect: invalid address length for host: %s", hostname);
return -1;
}
memcpy(socks_req + 4, (guchar *)hp->h_addr, 4);
/* userid (empty) */
socks_req[8] = 0;
if (sock_write_all(sock, (gchar *)socks_req, 9) != 9) {
g_warning("socks4_connect: SOCKS4 initial request write failed");
return -1;
}
if (sock_read(sock, (gchar *)socks_req, 8) != 8) {
g_warning("socks4_connect: SOCKS4 response read failed");
return -1;
}
if (socks_req[0] != 0) {
g_warning("socks4_connect: SOCKS4 response has invalid version");
return -1;
}
if (socks_req[1] != 90) {
g_warning("socks4_connect: SOCKS4 connection to %u.%u.%u.%u:%u failed. (%u)", socks_req[4], socks_req[5], socks_req[6], socks_req[7], ntohs(*(gushort *)(socks_req + 2)), socks_req[1]);
return -1;
}
/* replace sock->hostname with endpoint */
if (sock->hostname != hostname) {
g_free(sock->hostname);
sock->hostname = g_strdup(hostname);
sock->port = port;
}
debug_print("socks4_connect: SOCKS4 connection to %s:%u successful.\n", hostname, port);
return 0;
}
gint socks5_connect(SockInfo *sock, const gchar *hostname, gushort port,
const gchar *proxy_name, const gchar *proxy_pass)
{
guchar socks_req[1024];
size_t len;
size_t size;
g_return_val_if_fail(sock != NULL, -1);
g_return_val_if_fail(hostname != NULL, -1);
debug_print("socks5_connect: connect to %s:%u\n", hostname, port);
len = strlen(hostname);
if (len > 255) {
g_warning("socks5_connect: hostname too long");
return -1;
}
socks_req[0] = 5;
socks_req[1] = proxy_name ? 2 : 1;
socks_req[2] = 0;
socks_req[3] = 2;
if (sock_write_all(sock, (gchar *)socks_req, 2 + socks_req[1]) != 2 + socks_req[1]) {
g_warning("socks5_connect: SOCKS5 initial request write failed");
return -1;
}
if (sock_read(sock, (gchar *)socks_req, 2) != 2) {
g_warning("socks5_connect: SOCKS5 response read failed");
return -1;
}
if (socks_req[0] != 5) {
g_warning("socks5_connect: SOCKS5 response has invalid version");
return -1;
}
if (socks_req[1] == 2) {
/* auth */
size_t userlen, passlen;
gint reqlen;
if (proxy_name && proxy_pass) {
userlen = strlen(proxy_name);
passlen = strlen(proxy_pass);
} else
userlen = passlen = 0;
socks_req[0] = 1;
socks_req[1] = (guchar)userlen;
if (proxy_name && userlen > 0)
memcpy(socks_req + 2, proxy_name, userlen);
socks_req[2 + userlen] = (guchar)passlen;
if (proxy_pass && passlen > 0)
memcpy(socks_req + 2 + userlen + 1, proxy_pass, passlen);
reqlen = 2 + userlen + 1 + passlen;
if (sock_write_all(sock, (gchar *)socks_req, reqlen) != reqlen) {
g_warning("socks5_connect: SOCKS5 auth write failed");
return -1;
}
if (sock_read(sock, (gchar *)socks_req, 2) != 2) {
g_warning("socks5_connect: SOCKS5 auth response read failed");
return -1;
}
if (socks_req[1] != 0) {
g_warning("socks5_connect: SOCKS5 authentication failed: user: %s (%u %u)", proxy_name ? proxy_name : "(none)", socks_req[0], socks_req[1]);
return -1;
}
} else if (socks_req[1] != 0) {
g_warning("socks5_connect: SOCKS5 reply (%u) error", socks_req[1]);
return -1;
}
socks_req[0] = 5;
socks_req[1] = 1;
socks_req[2] = 0;
socks_req[3] = 3;
socks_req[4] = (guchar)len;
memcpy(socks_req + 5, hostname, len);
*((gushort *)(socks_req + 5 + len)) = htons(port);
if (sock_write_all(sock, (gchar *)socks_req, 5 + len + 2) != 5 + len + 2) {
g_warning("socks5_connect: SOCKS5 connect request write failed");
return -1;
}
if (sock_read(sock, (gchar *)socks_req, 10) != 10) {
g_warning("socks5_connect: SOCKS5 connect request response read failed");
return -1;
}
if (socks_req[0] != 5) {
g_warning("socks5_connect: SOCKS5 response has invalid version");
return -1;
}
if (socks_req[1] != 0) {
g_warning("socks5_connect: SOCKS5 connection to %u.%u.%u.%u:%u failed. (%u)", socks_req[4], socks_req[5], socks_req[6], socks_req[7], ntohs(*(gushort *)(socks_req + 8)), socks_req[1]);
return -1;
}
size = 10;
if (socks_req[3] == 3)
size = 5 + socks_req[4] + 2;
else if (socks_req[3] == 4)
size = 4 + 16 + 2;
if (size > 10) {
size -= 10;
if (sock_read(sock, (gchar *)socks_req + 10, size) != size) {
g_warning("socks5_connect: SOCKS5 connect request response read failed");
return -1;
}
}
/* replace sock->hostname with endpoint */
if (sock->hostname != hostname) {
g_free(sock->hostname);
sock->hostname = g_strdup(hostname);
sock->port = port;
}
debug_print("socks5_connect: SOCKS5 connection to %s:%u successful.\n", hostname, port);
return 0;
}
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