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/*
* gaim
*
* Copyright (C) 1998-1999, Mark Spencer <markster@marko.net>
* Copyright (C) 2002-2004, Wilmer van der Gaast, Jelmer Vernooij
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*
* This program 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#define BITLBEE_CORE
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>
#ifndef _WIN32
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <unistd.h>
#else
#include "sock.h"
#define ETIMEDOUT WSAETIMEDOUT
#define EINPROGRESS WSAEINPROGRESS
#endif
#include <fcntl.h>
#include <errno.h>
#include "nogaim.h"
#include "proxy.h"
#include "base64.h"
char proxyhost[128] = "";
int proxyport = 0;
int proxytype = PROXY_NONE;
char proxyuser[128] = "";
char proxypass[128] = "";
/* Some systems don't know this one. It's not essential, so set it to 0 then. */
#ifndef AI_NUMERICSERV
#define AI_NUMERICSERV 0
#endif
#ifndef AI_ADDRCONFIG
#define AI_ADDRCONFIG 0
#endif
struct PHB {
b_event_handler func, proxy_func;
gpointer data, proxy_data;
char *host;
int port;
int fd;
gint inpa;
struct addrinfo *gai, *gai_cur;
};
static int proxy_connect_none(const char *host, unsigned short port_, struct PHB *phb);
static gboolean gaim_io_connected(gpointer data, gint source, b_input_condition cond)
{
struct PHB *phb = data;
unsigned int len;
int error = ETIMEDOUT;
len = sizeof(error);
#ifndef _WIN32
if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0 || error) {
if ((phb->gai_cur = phb->gai_cur->ai_next)) {
int new_fd;
b_event_remove(phb->inpa);
if ((new_fd = proxy_connect_none(NULL, 0, phb))) {
b_event_remove(phb->inpa);
closesocket(source);
dup2(new_fd, source);
phb->inpa = b_input_add(source, B_EV_IO_WRITE, gaim_io_connected, phb);
return FALSE;
}
}
freeaddrinfo(phb->gai);
closesocket(source);
b_event_remove(phb->inpa);
if( phb->proxy_func )
phb->proxy_func(phb->proxy_data, -1, B_EV_IO_READ);
else {
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb);
}
return FALSE;
}
#endif
freeaddrinfo(phb->gai);
sock_make_blocking(source);
b_event_remove(phb->inpa);
if( phb->proxy_func )
phb->proxy_func(phb->proxy_data, source, B_EV_IO_READ);
else {
phb->func(phb->data, source, B_EV_IO_READ);
g_free(phb);
}
return FALSE;
}
static int proxy_connect_none(const char *host, unsigned short port_, struct PHB *phb)
{
struct sockaddr_in me;
int fd = -1;
if (phb->gai_cur == NULL)
{
int ret;
char port[6];
struct addrinfo hints;
g_snprintf(port, sizeof(port), "%d", port_);
memset(&hints, 0, sizeof(struct addrinfo));
hints.ai_family = AF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_ADDRCONFIG | AI_NUMERICSERV;
if (!(ret = getaddrinfo(host, port, &hints, &phb->gai)))
phb->gai_cur = phb->gai;
else
event_debug("gai(): %s\n", gai_strerror(ret));
}
for (; phb->gai_cur; phb->gai_cur = phb->gai_cur->ai_next)
{
if ((fd = socket(phb->gai_cur->ai_family, phb->gai_cur->ai_socktype, phb->gai_cur->ai_protocol)) < 0) {
event_debug( "socket failed: %d\n", errno);
continue;
}
sock_make_nonblocking(fd);
if (global.conf->iface_out)
{
me.sin_family = AF_INET;
me.sin_port = 0;
me.sin_addr.s_addr = inet_addr( global.conf->iface_out );
if (bind(fd, (struct sockaddr *) &me, sizeof(me)) != 0)
event_debug("bind( %d, \"%s\" ) failure\n", fd, global.conf->iface_out);
}
event_debug("proxy_connect_none( \"%s\", %d ) = %d\n", host, port, fd);
if (connect(fd, phb->gai_cur->ai_addr, phb->gai_cur->ai_addrlen) < 0 && !sockerr_again()) {
event_debug( "connect failed: %s\n", strerror(errno));
closesocket(fd);
fd = -1;
continue;
} else {
phb->inpa = b_input_add(fd, B_EV_IO_WRITE, gaim_io_connected, phb);
phb->fd = fd;
break;
}
}
if(fd < 0 && host)
g_free(phb);
return fd;
}
/* Connecting to HTTP proxies */
#define HTTP_GOODSTRING "HTTP/1.0 200 Connection established"
#define HTTP_GOODSTRING2 "HTTP/1.1 200 Connection established"
static gboolean http_canread(gpointer data, gint source, b_input_condition cond)
{
int nlc = 0;
int pos = 0;
struct PHB *phb = data;
char inputline[8192];
b_event_remove(phb->inpa);
while ((pos < sizeof(inputline)-1) && (nlc != 2) && (read(source, &inputline[pos++], 1) == 1)) {
if (inputline[pos - 1] == '\n')
nlc++;
else if (inputline[pos - 1] != '\r')
nlc = 0;
}
inputline[pos] = '\0';
if ((memcmp(HTTP_GOODSTRING, inputline, strlen(HTTP_GOODSTRING)) == 0) ||
(memcmp(HTTP_GOODSTRING2, inputline, strlen(HTTP_GOODSTRING2)) == 0)) {
phb->func(phb->data, source, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
static gboolean http_canwrite(gpointer data, gint source, b_input_condition cond)
{
char cmd[384];
struct PHB *phb = data;
unsigned int len;
int error = ETIMEDOUT;
if (phb->inpa > 0)
b_event_remove(phb->inpa);
len = sizeof(error);
if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
sock_make_blocking(source);
g_snprintf(cmd, sizeof(cmd), "CONNECT %s:%d HTTP/1.1\r\nHost: %s:%d\r\n", phb->host, phb->port,
phb->host, phb->port);
if (send(source, cmd, strlen(cmd), 0) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
if (strlen(proxyuser) > 0) {
char *t1, *t2;
t1 = g_strdup_printf("%s:%s", proxyuser, proxypass);
t2 = tobase64(t1);
g_free(t1);
g_snprintf(cmd, sizeof(cmd), "Proxy-Authorization: Basic %s\r\n", t2);
g_free(t2);
if (send(source, cmd, strlen(cmd), 0) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
}
g_snprintf(cmd, sizeof(cmd), "\r\n");
if (send(source, cmd, strlen(cmd), 0) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
phb->inpa = b_input_add(source, B_EV_IO_READ, http_canread, phb);
return FALSE;
}
static int proxy_connect_http(const char *host, unsigned short port, struct PHB *phb)
{
phb->host = g_strdup(host);
phb->port = port;
phb->proxy_func = http_canwrite;
phb->proxy_data = phb;
return( proxy_connect_none( proxyhost, proxyport, phb ) );
}
/* Connecting to SOCKS4 proxies */
static gboolean s4_canread(gpointer data, gint source, b_input_condition cond)
{
unsigned char packet[12];
struct PHB *phb = data;
b_event_remove(phb->inpa);
memset(packet, 0, sizeof(packet));
if (read(source, packet, 9) >= 4 && packet[1] == 90) {
phb->func(phb->data, source, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
static gboolean s4_canwrite(gpointer data, gint source, b_input_condition cond)
{
unsigned char packet[12];
struct hostent *hp;
struct PHB *phb = data;
unsigned int len;
int error = ETIMEDOUT;
if (phb->inpa > 0)
b_event_remove(phb->inpa);
len = sizeof(error);
if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
sock_make_blocking(source);
/* XXX does socks4 not support host name lookups by the proxy? */
if (!(hp = gethostbyname(phb->host))) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
packet[0] = 4;
packet[1] = 1;
packet[2] = phb->port >> 8;
packet[3] = phb->port & 0xff;
packet[4] = (unsigned char)(hp->h_addr_list[0])[0];
packet[5] = (unsigned char)(hp->h_addr_list[0])[1];
packet[6] = (unsigned char)(hp->h_addr_list[0])[2];
packet[7] = (unsigned char)(hp->h_addr_list[0])[3];
packet[8] = 0;
if (write(source, packet, 9) != 9) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
phb->inpa = b_input_add(source, B_EV_IO_READ, s4_canread, phb);
return FALSE;
}
static int proxy_connect_socks4(const char *host, unsigned short port, struct PHB *phb)
{
phb->host = g_strdup(host);
phb->port = port;
phb->proxy_func = s4_canwrite;
phb->proxy_data = phb;
return( proxy_connect_none( proxyhost, proxyport, phb ) );
}
/* Connecting to SOCKS5 proxies */
static gboolean s5_canread_again(gpointer data, gint source, b_input_condition cond)
{
unsigned char buf[512];
struct PHB *phb = data;
b_event_remove(phb->inpa);
if (read(source, buf, 10) < 10) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
if ((buf[0] != 0x05) || (buf[1] != 0x00)) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
phb->func(phb->data, source, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
static void s5_sendconnect(gpointer data, gint source)
{
unsigned char buf[512];
struct PHB *phb = data;
int hlen = strlen(phb->host);
buf[0] = 0x05;
buf[1] = 0x01; /* CONNECT */
buf[2] = 0x00; /* reserved */
buf[3] = 0x03; /* address type -- host name */
buf[4] = hlen;
memcpy(buf + 5, phb->host, hlen);
buf[5 + strlen(phb->host)] = phb->port >> 8;
buf[5 + strlen(phb->host) + 1] = phb->port & 0xff;
if (write(source, buf, (5 + strlen(phb->host) + 2)) < (5 + strlen(phb->host) + 2)) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return;
}
phb->inpa = b_input_add(source, B_EV_IO_READ, s5_canread_again, phb);
}
static gboolean s5_readauth(gpointer data, gint source, b_input_condition cond)
{
unsigned char buf[512];
struct PHB *phb = data;
b_event_remove(phb->inpa);
if (read(source, buf, 2) < 2) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
if ((buf[0] != 0x01) || (buf[1] != 0x00)) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
s5_sendconnect(phb, source);
return FALSE;
}
static gboolean s5_canread(gpointer data, gint source, b_input_condition cond)
{
unsigned char buf[512];
struct PHB *phb = data;
b_event_remove(phb->inpa);
if (read(source, buf, 2) < 2) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
if ((buf[0] != 0x05) || (buf[1] == 0xff)) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
if (buf[1] == 0x02) {
unsigned int i = strlen(proxyuser), j = strlen(proxypass);
buf[0] = 0x01; /* version 1 */
buf[1] = i;
memcpy(buf + 2, proxyuser, i);
buf[2 + i] = j;
memcpy(buf + 2 + i + 1, proxypass, j);
if (write(source, buf, 3 + i + j) < 3 + i + j) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
phb->inpa = b_input_add(source, B_EV_IO_READ, s5_readauth, phb);
} else {
s5_sendconnect(phb, source);
}
return FALSE;
}
static gboolean s5_canwrite(gpointer data, gint source, b_input_condition cond)
{
unsigned char buf[512];
int i;
struct PHB *phb = data;
unsigned int len;
int error = ETIMEDOUT;
if (phb->inpa > 0)
b_event_remove(phb->inpa);
len = sizeof(error);
if (getsockopt(source, SOL_SOCKET, SO_ERROR, &error, &len) < 0) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
sock_make_blocking(source);
i = 0;
buf[0] = 0x05; /* SOCKS version 5 */
if (proxyuser[0]) {
buf[1] = 0x02; /* two methods */
buf[2] = 0x00; /* no authentication */
buf[3] = 0x02; /* username/password authentication */
i = 4;
} else {
buf[1] = 0x01;
buf[2] = 0x00;
i = 3;
}
if (write(source, buf, i) < i) {
close(source);
phb->func(phb->data, -1, B_EV_IO_READ);
g_free(phb->host);
g_free(phb);
return FALSE;
}
phb->inpa = b_input_add(source, B_EV_IO_READ, s5_canread, phb);
return FALSE;
}
static int proxy_connect_socks5(const char *host, unsigned short port, struct PHB *phb)
{
phb->host = g_strdup(host);
phb->port = port;
phb->proxy_func = s5_canwrite;
phb->proxy_data = phb;
return( proxy_connect_none( proxyhost, proxyport, phb ) );
}
/* Export functions */
int proxy_connect(const char *host, int port, b_event_handler func, gpointer data)
{
struct PHB *phb;
if (!host || port <= 0 || !func || strlen(host) > 128) {
return -1;
}
phb = g_new0(struct PHB, 1);
phb->func = func;
phb->data = data;
if (proxytype == PROXY_NONE || !proxyhost[0] || proxyport <= 0)
return proxy_connect_none(host, port, phb);
else if (proxytype == PROXY_HTTP)
return proxy_connect_http(host, port, phb);
else if (proxytype == PROXY_SOCKS4)
return proxy_connect_socks4(host, port, phb);
else if (proxytype == PROXY_SOCKS5)
return proxy_connect_socks5(host, port, phb);
g_free(phb);
return -1;
}
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