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proxychains-ng/proxychains/libproxychains.c

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/***************************************************************************
libproxychains.c - description
-------------------
begin : Tue May 14 2002
copyright : netcreature (C) 2002
email : netcreature@users.sourceforge.net
***************************************************************************/
/* GPL */
/***************************************************************************
* *
* 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. *
* *
***************************************************************************/
#define _GNU_SOURCE
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif
#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <memory.h>
#include <errno.h>
#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/fcntl.h>
#include <dlfcn.h>
#include "core.h"
#define satosin(x) ((struct sockaddr_in *) &(x))
#define SOCKADDR(x) (satosin(x)->sin_addr.s_addr)
#define SOCKADDR_2(x) (satosin(x)->sin_addr)
#define SOCKPORT(x) (satosin(x)->sin_port)
#define SOCKFAMILY(x) (satosin(x)->sin_family)
#define MAX_CHAIN 30*1024
int tcp_read_time_out;
int tcp_connect_time_out;
chain_type proxychains_ct;
proxy_data proxychains_pd[MAX_CHAIN];
int proxychains_proxy_count = 0;
int proxychains_got_chain_data = 0;
int proxychains_max_chain = 1;
int proxychains_quiet_mode = 0;
int proxychains_resolver = 0;
static int init_l = 0;
static inline void get_chain_data(
proxy_data *pd,
unsigned int *proxy_count,
chain_type *ct);
static void init_lib()
{
// proxychains_write_log("ProxyChains-"VERSION
// " (http://proxychains.sf.net)\n");
get_chain_data(proxychains_pd,&proxychains_proxy_count,&proxychains_ct);
true_connect = (connect_t) dlsym(RTLD_NEXT, "connect");
if (!true_connect) {
fprintf(stderr, "Cannot load symbol 'connect' %s\n", dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'connect'"
// " real addr %p wrapped addr %p\n",
// true_connect, connect);
}
true_gethostbyname = (gethostbyname_t)
dlsym(RTLD_NEXT, "gethostbyname");
if (!true_gethostbyname) {
fprintf(stderr, "Cannot load symbol 'gethostbyname' %s\n",
dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'gethostbyname'"
// " real addr %p wrapped addr %p\n",
// true_gethostbyname, gethostbyname);
}
true_getaddrinfo = (getaddrinfo_t)
dlsym(RTLD_NEXT, "getaddrinfo");
if (!true_getaddrinfo) {
fprintf(stderr, "Cannot load symbol 'getaddrinfo' %s\n",
dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'getaddrinfo'"
// " real addr %p wrapped addr %p\n",
// true_getaddrinfo, getaddrinfo);
}
true_freeaddrinfo = (freeaddrinfo_t)
dlsym(RTLD_NEXT, "freeaddrinfo");
if (!true_freeaddrinfo) {
fprintf(stderr, "Cannot load symbol 'freeaddrinfo' %s\n",
dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'freeaddrinfo'"
// " real addr %p wrapped addr %p\n",
// true_freeaddrinfo, freeaddrinfo);
}
true_gethostbyaddr = (gethostbyaddr_t)
dlsym(RTLD_NEXT, "gethostbyaddr");
if (!true_gethostbyaddr) {
fprintf(stderr, "Cannot load symbol 'gethostbyaddr' %s\n",
dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'gethostbyaddr'"
// " real addr %p wrapped addr %p\n",
// true_gethostbyaddr, gethostbyaddr);
}
true_getnameinfo = (getnameinfo_t)
dlsym(RTLD_NEXT, "getnameinfo");
if (!true_getnameinfo) {
fprintf(stderr, "Cannot load symbol 'getnameinfo' %s\n",
dlerror());
exit(1);
} else {
// PDEBUG( "loaded symbol 'getnameinfo'"
// " real addr %p wrapped addr %p\n",
// true_getnameinfo, getnameinfo);
}
init_l = 1;
}
/*
* XXX. Same thing is defined in proxychains main.c it
* needs to be changed, too.
*/
#define PROXYCHAINS_CONF_FILE "PROXYCHAINS_CONF_FILE"
static inline void get_chain_data(
proxy_data *pd,
unsigned int *proxy_count,
chain_type *ct)
{
int count=0,port_n=0,list=0;
char buff[1024],type[1024],host[1024],user[1024];
char *env;
FILE* file;
if(proxychains_got_chain_data)
return;
//Some defaults
tcp_read_time_out=4*1000;
tcp_connect_time_out=10*1000;
*ct=DYNAMIC_TYPE;
env = NULL;
/*
* Get path to configuration file from env this file has priority
* if it's defined.
*/
env = getenv(PROXYCHAINS_CONF_FILE);
snprintf(buff,256,"%s/.proxychains/proxychains.conf",getenv("HOME"));
if(!(file=fopen(env,"r")))
if(!(file=fopen("./proxychains.conf","r")))
if(!(file=fopen(buff,"r")))
if(!(file=fopen("/etc/proxychains.conf","r")))
{
perror("Can't locate proxychains.conf");
exit(1);
}
while(fgets(buff,sizeof(buff),file)) {
if(buff[strspn(buff," ")]!='#') {
if(list) {
bzero(&pd[count], sizeof(proxy_data));
pd[count].ps=PLAY_STATE;
port_n=0;
sscanf(buff,"%s %s %d %s %s", type,host,&port_n,
pd[count].user,pd[count].pass);
pd[count].ip=inet_addr(host);
pd[count].port=htons((unsigned short)port_n);
if(!strcmp(type,"http")) {
pd[count].pt=HTTP_TYPE;
}else if(!strcmp(type,"socks4")) {
pd[count].pt=SOCKS4_TYPE;
}else if(!strcmp(type,"socks5")) {
pd[count].pt=SOCKS5_TYPE;
}else continue;
if( pd[count].ip && pd[count].ip!=-1 && port_n)
if(++count==MAX_CHAIN)
break;
} else {
if(strstr(buff,"[ProxyList]")) {
list=1;
} else if(strstr(buff,"random_chain")) {
*ct=RANDOM_TYPE;
} else if(strstr(buff,"strict_chain")) {
*ct=STRICT_TYPE;
} else if(strstr(buff,"dynamic_chain")) {
*ct=DYNAMIC_TYPE;
}else if(strstr(buff,"tcp_read_time_out")){
sscanf(buff,"%s %d",user,&tcp_read_time_out) ;
}else if(strstr(buff,"tcp_connect_time_out")){
sscanf(buff,"%s %d",user,&tcp_connect_time_out) ;
}else if(strstr(buff,"chain_len")){
char *pc;int len;
pc=strchr(buff,'=');
len=atoi(++pc);
proxychains_max_chain=(len?len:1);
}else if(strstr(buff,"quiet_mode")){
proxychains_quiet_mode=1;
}else if(strstr(buff,"proxy_dns")){
proxychains_resolver=1;
}
}
}
}
fclose(file);
*proxy_count=count;
proxychains_got_chain_data=1;
}
int connect (int sock, const struct sockaddr *addr, unsigned int len)
{
int socktype=0,optlen=0,flags=0,ret=0;
if(!init_l)
init_lib();
optlen=sizeof(socktype);
getsockopt(sock,SOL_SOCKET,SO_TYPE,&socktype,&optlen);
if (! (SOCKFAMILY(*addr)==AF_INET && socktype==SOCK_STREAM))
return true_connect(sock,addr,len);
flags=fcntl(sock, F_GETFL, 0);
if(flags & O_NONBLOCK)
fcntl(sock, F_SETFL, !O_NONBLOCK);
ret=connect_proxy_chain(
sock,
SOCKADDR(*addr),
SOCKPORT(*addr),
proxychains_pd,
proxychains_proxy_count,
proxychains_ct,
proxychains_max_chain );
fcntl(sock, F_SETFL, flags);
if(ret!=SUCCESS)
errno=ECONNREFUSED;
return ret;
}
struct hostent *gethostbyname(const char *name)
{
PDEBUG("gethostbyname: %s\n",name);
if(!init_l)
init_lib();
if(proxychains_resolver)
return proxy_gethostbyname(name);
else
return true_gethostbyname(name);
return NULL;
}
int getaddrinfo(const char *node, const char *service,
const struct addrinfo *hints,
struct addrinfo **res)
{
int ret = 0;
PDEBUG("getaddrinfo: %s %s\n",node ,service);
if(!init_l)
init_lib();
if(proxychains_resolver)
ret = proxy_getaddrinfo(node, service, hints, res);
else
ret = true_getaddrinfo(node, service, hints, res);
return ret;
}
void freeaddrinfo(struct addrinfo *res)
{
PDEBUG("freeaddrinfo %p \n",res);
if(!init_l)
init_lib();
if(!proxychains_resolver)
true_freeaddrinfo(res);
else {
free(res->ai_addr);
free(res);
}
return;
}
int getnameinfo (const struct sockaddr * sa,
socklen_t salen, char * host,
socklen_t hostlen, char * serv,
socklen_t servlen, unsigned int flags)
{
int ret = 0;
if(!init_l)
init_lib();
if(!proxychains_resolver) {
ret = true_getnameinfo(sa,salen,host,hostlen,
serv,servlen,flags);
} else {
if(hostlen)
strncpy(host, inet_ntoa(SOCKADDR_2(*sa)),hostlen);
if(servlen)
snprintf(serv, servlen,"%d",ntohs(SOCKPORT(*sa)));
}
PDEBUG("getnameinfo: %s %s\n", host, serv);
return ret;
}
struct hostent *gethostbyaddr (const void *addr, socklen_t len,
int type)
{
PDEBUG("TODO: gethostbyaddr hook\n");
if(!init_l)
init_lib();
if(!proxychains_resolver)
return true_gethostbyaddr(addr,len,type);
return NULL;
}
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