proxychains-ng/src/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. *
* *
***************************************************************************/
#undef _GNU_SOURCE
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#define _GNU_SOURCE
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#include <stdio.h>
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
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#include <errno.h>
#include <assert.h>
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#include <netdb.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <fcntl.h>
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#include <dlfcn.h>
#include <pthread.h>
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#include "core.h"
#include "common.h"
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#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)
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#define MAX_CHAIN 512
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#ifdef IS_SOLARIS
#undef connect
int __xnet_connect(int sock, const struct sockaddr *addr, unsigned int len);
connect_t true___xnet_connect;
#endif
close_t true_close;
connect_t true_connect;
gethostbyname_t true_gethostbyname;
getaddrinfo_t true_getaddrinfo;
freeaddrinfo_t true_freeaddrinfo;
getnameinfo_t true_getnameinfo;
gethostbyaddr_t true_gethostbyaddr;
sendto_t true_sendto;
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int tcp_read_time_out;
int tcp_connect_time_out;
chain_type proxychains_ct;
proxy_data proxychains_pd[MAX_CHAIN];
unsigned int proxychains_proxy_count = 0;
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unsigned int proxychains_proxy_offset = 0;
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int proxychains_got_chain_data = 0;
unsigned int proxychains_max_chain = 1;
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int proxychains_quiet_mode = 0;
int proxychains_resolver = 0;
localaddr_arg localnet_addr[MAX_LOCALNET];
size_t num_localnet_addr = 0;
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unsigned int remote_dns_subnet = 224;
pthread_once_t init_once = PTHREAD_ONCE_INIT;
static int init_l = 0;
static inline void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_type * ct);
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static void* load_sym(char* symname, void* proxyfunc) {
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void *funcptr = dlsym(RTLD_NEXT, symname);
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if(!funcptr) {
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fprintf(stderr, "Cannot load symbol '%s' %s\n", symname, dlerror());
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exit(1);
} else {
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PDEBUG("loaded symbol '%s'" " real addr %p wrapped addr %p\n", symname, funcptr, proxyfunc);
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}
if(funcptr == proxyfunc) {
PDEBUG("circular reference detected, aborting!\n");
abort();
}
return funcptr;
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}
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#define INIT() init_lib_wrapper(__FUNCTION__)
#define SETUP_SYM(X) do { if (! true_ ## X ) true_ ## X = load_sym( # X, X ); } while(0)
#include "allocator_thread.h"
const char *proxychains_get_version(void);
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static void setup_hooks(void) {
SETUP_SYM(connect);
SETUP_SYM(sendto);
SETUP_SYM(gethostbyname);
SETUP_SYM(getaddrinfo);
SETUP_SYM(freeaddrinfo);
SETUP_SYM(gethostbyaddr);
SETUP_SYM(getnameinfo);
SETUP_SYM(close);
#ifdef IS_SOLARIS
SETUP_SYM(__xnet_connect);
#endif
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}
static int close_fds[16];
static int close_fds_cnt = 0;
static void do_init(void) {
srand(time(NULL));
core_initialize();
at_init();
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/* read the config file */
get_chain_data(proxychains_pd, &proxychains_proxy_count, &proxychains_ct);
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DUMP_PROXY_CHAIN(proxychains_pd, proxychains_proxy_count);
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proxychains_write_log(LOG_PREFIX "DLL init: proxychains-ng %s\n", proxychains_get_version());
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setup_hooks();
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while(close_fds_cnt) true_close(close_fds[--close_fds_cnt]);
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init_l = 1;
}
static void init_lib_wrapper(const char* caller) {
#ifndef DEBUG
(void) caller;
#endif
if(!init_l) PDEBUG("%s called from %s\n", __FUNCTION__, caller);
pthread_once(&init_once, do_init);
}
/* if we use gcc >= 3, we can instruct the dynamic loader
* to call init_lib at link time. otherwise it gets loaded
* lazily, which has the disadvantage that there's a potential
* race condition if 2 threads call it before init_l is set
* and PTHREAD support was disabled */
#if __GNUC__ > 2
__attribute__((constructor))
static void gcc_init(void) {
INIT();
}
#endif
typedef enum {
RS_PT_NONE = 0,
RS_PT_SOCKS4,
RS_PT_SOCKS5,
RS_PT_HTTP
} rs_proxyType;
/*
proxy_from_string() taken from rocksock network I/O library (C) rofl0r
valid inputs:
socks5://user:password@proxy.domain.com:port
socks5://proxy.domain.com:port
socks4://proxy.domain.com:port
http://user:password@proxy.domain.com:port
http://proxy.domain.com:port
supplying port number is obligatory.
user:pass@ part is optional for http and socks5.
however, user:pass authentication is currently not implemented for http proxies.
return 1 on success, 0 on error.
*/
static int proxy_from_string(const char *proxystring,
char *type_buf,
char* host_buf,
int *port_n,
char *user_buf,
char* pass_buf)
{
const char* p;
rs_proxyType proxytype;
size_t next_token = 6, ul = 0, pl = 0, hl;
if(!proxystring[0] || !proxystring[1] || !proxystring[2] || !proxystring[3] || !proxystring[4] || !proxystring[5]) goto inv_string;
if(*proxystring == 's') {
switch(proxystring[5]) {
case '5': proxytype = RS_PT_SOCKS5; break;
case '4': proxytype = RS_PT_SOCKS4; break;
default: goto inv_string;
}
} else if(*proxystring == 'h') {
proxytype = RS_PT_HTTP;
next_token = 4;
} else goto inv_string;
if(
proxystring[next_token++] != ':' ||
proxystring[next_token++] != '/' ||
proxystring[next_token++] != '/') goto inv_string;
const char *at = strchr(proxystring+next_token, '@');
if(at) {
if(proxytype == RS_PT_SOCKS4)
return 0;
p = strchr(proxystring+next_token, ':');
if(!p || p >= at) goto inv_string;
const char *u = proxystring+next_token;
ul = p-u;
p++;
pl = at-p;
if(proxytype == RS_PT_SOCKS5 && (ul > 255 || pl > 255))
return 0;
memcpy(user_buf, u, ul);
user_buf[ul]=0;
memcpy(pass_buf, p, pl);
pass_buf[pl]=0;
next_token += 2+ul+pl;
} else {
user_buf[0]=0;
pass_buf[0]=0;
}
const char* h = proxystring+next_token;
p = strchr(h, ':');
if(!p) goto inv_string;
hl = p-h;
if(hl > 255)
return 0;
memcpy(host_buf, h, hl);
host_buf[hl]=0;
*port_n = atoi(p+1);
switch(proxytype) {
case RS_PT_SOCKS4:
strcpy(type_buf, "socks4");
break;
case RS_PT_SOCKS5:
strcpy(type_buf, "socks5");
break;
case RS_PT_HTTP:
strcpy(type_buf, "http");
break;
default:
return 0;
}
return 1;
inv_string:
return 0;
}
/* get configuration from config file */
static 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;
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char local_in_addr_port[32];
char local_in_addr[32], local_in_port[32], local_netmask[32];
FILE *file = NULL;
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if(proxychains_got_chain_data)
return;
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//Some defaults
tcp_read_time_out = 4 * 1000;
tcp_connect_time_out = 10 * 1000;
*ct = DYNAMIC_TYPE;
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env = get_config_path(getenv(PROXYCHAINS_CONF_FILE_ENV_VAR), buff, sizeof(buff));
if( ( file = fopen(env, "r") ) == NULL )
{
perror("couldnt read configuration file");
exit(1);
}
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env = getenv(PROXYCHAINS_QUIET_MODE_ENV_VAR);
if(env && *env == '1')
proxychains_quiet_mode = 1;
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while(fgets(buff, sizeof(buff), file)) {
if(buff[0] != '\n' && buff[strspn(buff, " ")] != '#') {
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/* proxylist has to come last */
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if(list) {
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if(count >= MAX_CHAIN)
break;
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memset(&pd[count], 0, sizeof(proxy_data));
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pd[count].ps = PLAY_STATE;
port_n = 0;
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int ret = sscanf(buff, "%s %s %d %s %s", type, host, &port_n, pd[count].user, pd[count].pass);
if(ret < 3 || ret == EOF) {
if(!proxy_from_string(buff, type, host, &port_n, pd[count].user, pd[count].pass)) {
inv:
fprintf(stderr, "error: invalid item in proxylist section: %s", buff);
exit(1);
}
}
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memset(&pd[count].ip, 0, sizeof(pd[count].ip));
pd[count].ip.is_v6 = !!strchr(host, ':');
pd[count].port = htons((unsigned short) port_n);
ip_type* host_ip = &pd[count].ip;
if(1 != inet_pton(host_ip->is_v6 ? AF_INET6 : AF_INET, host, host_ip->addr.v6)) {
fprintf(stderr, "proxy %s has invalid value or is not numeric\n", host);
exit(1);
}
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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;
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} else
goto inv;
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if(port_n)
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count++;
} else {
if(strstr(buff, "[ProxyList]")) {
list = 1;
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} else if(strstr(buff, "random_chain")) {
*ct = RANDOM_TYPE;
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} else if(strstr(buff, "strict_chain")) {
*ct = STRICT_TYPE;
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} else if(strstr(buff, "dynamic_chain")) {
*ct = DYNAMIC_TYPE;
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} else if(strstr(buff, "round_robin_chain")) {
*ct = ROUND_ROBIN_TYPE;
} else if(strstr(buff, "tcp_read_time_out")) {
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sscanf(buff, "%s %d", user, &tcp_read_time_out);
} else if(strstr(buff, "tcp_connect_time_out")) {
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sscanf(buff, "%s %d", user, &tcp_connect_time_out);
} else if(strstr(buff, "remote_dns_subnet")) {
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sscanf(buff, "%s %u", user, &remote_dns_subnet);
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if(remote_dns_subnet >= 256) {
fprintf(stderr,
"remote_dns_subnet: invalid value. requires a number between 0 and 255.\n");
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exit(1);
}
} else if(strstr(buff, "localnet")) {
if(sscanf(buff, "%s %21[^/]/%15s", user, local_in_addr_port, local_netmask) < 3) {
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fprintf(stderr, "localnet format error");
exit(1);
}
/* clean previously used buffer */
memset(local_in_port, 0, sizeof(local_in_port) / sizeof(local_in_port[0]));
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if(sscanf(local_in_addr_port, "%15[^:]:%5s", local_in_addr, local_in_port) < 2) {
PDEBUG("added localnet: netaddr=%s, netmask=%s\n",
local_in_addr, local_netmask);
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} else {
PDEBUG("added localnet: netaddr=%s, port=%s, netmask=%s\n",
local_in_addr, local_in_port, local_netmask);
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}
if(num_localnet_addr < MAX_LOCALNET) {
int error;
error =
inet_pton(AF_INET, local_in_addr,
&localnet_addr[num_localnet_addr].in_addr);
if(error <= 0) {
fprintf(stderr, "localnet address error\n");
exit(1);
}
error =
inet_pton(AF_INET, local_netmask,
&localnet_addr[num_localnet_addr].netmask);
if(error <= 0) {
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fprintf(stderr, "localnet netmask error\n");
exit(1);
}
if(local_in_port[0]) {
localnet_addr[num_localnet_addr].port =
(short) atoi(local_in_port);
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} else {
localnet_addr[num_localnet_addr].port = 0;
}
++num_localnet_addr;
} else {
fprintf(stderr, "# of localnet exceed %d.\n", MAX_LOCALNET);
}
} else if(strstr(buff, "chain_len")) {
char *pc;
int len;
pc = strchr(buff, '=');
if(!pc) {
fprintf(stderr, "error: missing equals sign '=' in chain_len directive.\n");
exit(1);
}
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;
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}
}
}
}
#ifndef BROKEN_FCLOSE
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fclose(file);
#endif
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if(!count) {
fprintf(stderr, "error: no valid proxy found in config\n");
exit(1);
}
*proxy_count = count;
proxychains_got_chain_data = 1;
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}
/******* HOOK FUNCTIONS *******/
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int close(int fd) {
if(!init_l) {
if(close_fds_cnt>=(sizeof close_fds/sizeof close_fds[0])) goto err;
close_fds[close_fds_cnt++] = fd;
errno = 0;
return 0;
}
/* prevent rude programs (like ssh) from closing our pipes */
if(fd != req_pipefd[0] && fd != req_pipefd[1] &&
fd != resp_pipefd[0] && fd != resp_pipefd[1]) {
return true_close(fd);
}
err:
errno = EBADF;
return -1;
}
static int is_v4inv6(const struct in6_addr *a) {
return !memcmp(a->s6_addr, "\0\0\0\0\0\0\0\0\0\0\xff\xff", 12);
}
int connect(int sock, const struct sockaddr *addr, unsigned int len) {
INIT();
PFUNC();
int socktype = 0, flags = 0, ret = 0;
socklen_t optlen = 0;
ip_type dest_ip;
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DEBUGDECL(char str[256]);
struct in_addr *p_addr_in;
struct in6_addr *p_addr_in6;
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unsigned short port;
size_t i;
int remote_dns_connect = 0;
optlen = sizeof(socktype);
sa_family_t fam = SOCKFAMILY(*addr);
getsockopt(sock, SOL_SOCKET, SO_TYPE, &socktype, &optlen);
if(!((fam == AF_INET || fam == AF_INET6) && socktype == SOCK_STREAM))
return true_connect(sock, addr, len);
int v6 = dest_ip.is_v6 = fam == AF_INET6;
p_addr_in = &((struct sockaddr_in *) addr)->sin_addr;
p_addr_in6 = &((struct sockaddr_in6 *) addr)->sin6_addr;
port = !v6 ? ntohs(((struct sockaddr_in *) addr)->sin_port)
: ntohs(((struct sockaddr_in6 *) addr)->sin6_port);
struct in_addr v4inv6;
if(v6 && is_v4inv6(p_addr_in6)) {
memcpy(&v4inv6.s_addr, &p_addr_in6->s6_addr[12], 4);
v6 = dest_ip.is_v6 = 0;
p_addr_in = &v4inv6;
}
// PDEBUG("localnet: %s; ", inet_ntop(AF_INET,&in_addr_localnet, str, sizeof(str)));
// PDEBUG("netmask: %s; " , inet_ntop(AF_INET, &in_addr_netmask, str, sizeof(str)));
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PDEBUG("target: %s\n", inet_ntop(v6 ? AF_INET6 : AF_INET, v6 ? (void*)p_addr_in6 : (void*)p_addr_in, str, sizeof(str)));
PDEBUG("port: %d\n", port);
// check if connect called from proxydns
remote_dns_connect = !v6 && (ntohl(p_addr_in->s_addr) >> 24 == remote_dns_subnet);
if (!v6) for(i = 0; i < num_localnet_addr && !remote_dns_connect; i++) {
if((localnet_addr[i].in_addr.s_addr & localnet_addr[i].netmask.s_addr)
== (p_addr_in->s_addr & localnet_addr[i].netmask.s_addr)) {
if(!localnet_addr[i].port || localnet_addr[i].port == port) {
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PDEBUG("accessing localnet using true_connect\n");
return true_connect(sock, addr, len);
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}
}
}
flags = fcntl(sock, F_GETFL, 0);
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if(flags & O_NONBLOCK)
fcntl(sock, F_SETFL, !O_NONBLOCK);
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memcpy(dest_ip.addr.v6, v6 ? (void*)p_addr_in6 : (void*)p_addr_in, v6?16:4);
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ret = connect_proxy_chain(sock,
dest_ip,
htons(port),
proxychains_pd, proxychains_proxy_count, proxychains_ct, proxychains_max_chain);
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fcntl(sock, F_SETFL, flags);
if(ret != SUCCESS)
errno = ECONNREFUSED;
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return ret;
}
#ifdef IS_SOLARIS
int __xnet_connect(int sock, const struct sockaddr *addr, unsigned int len) {
return connect(sock, addr, len);
}
#endif
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static struct gethostbyname_data ghbndata;
struct hostent *gethostbyname(const char *name) {
INIT();
PDEBUG("gethostbyname: %s\n", name);
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if(proxychains_resolver)
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return proxy_gethostbyname(name, &ghbndata);
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else
return true_gethostbyname(name);
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return NULL;
}
int getaddrinfo(const char *node, const char *service, const struct addrinfo *hints, struct addrinfo **res) {
INIT();
PDEBUG("getaddrinfo: %s %s\n", node ? node : "null", service ? service : "null");
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if(proxychains_resolver)
return proxy_getaddrinfo(node, service, hints, res);
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else
return true_getaddrinfo(node, service, hints, res);
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}
void freeaddrinfo(struct addrinfo *res) {
INIT();
PDEBUG("freeaddrinfo %p \n", (void *) res);
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if(!proxychains_resolver)
true_freeaddrinfo(res);
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else
proxy_freeaddrinfo(res);
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}
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int pc_getnameinfo(const struct sockaddr *sa, socklen_t salen,
char *host, socklen_t hostlen, char *serv,
socklen_t servlen, int flags)
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{
INIT();
PFUNC();
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if(!proxychains_resolver) {
return true_getnameinfo(sa, salen, host, hostlen, serv, servlen, flags);
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} else {
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if(!salen || !(SOCKFAMILY(*sa) == AF_INET || SOCKFAMILY(*sa) == AF_INET6))
return EAI_FAMILY;
int v6 = SOCKFAMILY(*sa) == AF_INET6;
if(salen < (v6?sizeof(struct sockaddr_in6):sizeof(struct sockaddr_in)))
return EAI_FAMILY;
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if(hostlen) {
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unsigned char v4inv6buf[4];
const void *ip = v6 ? (void*)&((struct sockaddr_in6*)sa)->sin6_addr
: (void*)&((struct sockaddr_in*)sa)->sin_addr;
unsigned scopeid = 0;
if(v6) {
if(is_v4inv6(&((struct sockaddr_in6*)sa)->sin6_addr)) {
memcpy(v4inv6buf, &((struct sockaddr_in6*)sa)->sin6_addr.s6_addr[12], 4);
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ip = v4inv6buf;
v6 = 0;
} else
scopeid = ((struct sockaddr_in6 *)sa)->sin6_scope_id;
}
if(!inet_ntop(v6?AF_INET6:AF_INET,ip,host,hostlen))
return EAI_OVERFLOW;
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if(scopeid) {
size_t l = strlen(host);
if(snprintf(host+l, hostlen-l, "%%%u", scopeid) >= hostlen-l)
return EAI_OVERFLOW;
}
}
if(servlen) {
if(snprintf(serv, servlen, "%d", ntohs(SOCKPORT(*sa))) >= servlen)
return EAI_OVERFLOW;
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}
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}
return 0;
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}
struct hostent *gethostbyaddr(const void *addr, socklen_t len, int type) {
INIT();
PDEBUG("TODO: proper gethostbyaddr hook\n");
static char buf[16];
static char ipv4[4];
static char *list[2];
static char *aliases[1];
static struct hostent he;
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if(!proxychains_resolver)
return true_gethostbyaddr(addr, len, type);
else {
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PDEBUG("len %u\n", len);
if(len != 4)
return NULL;
he.h_name = buf;
memcpy(ipv4, addr, 4);
list[0] = ipv4;
list[1] = NULL;
he.h_addr_list = list;
he.h_addrtype = AF_INET;
aliases[0] = NULL;
he.h_aliases = aliases;
he.h_length = 4;
pc_stringfromipv4((unsigned char *) addr, buf);
return &he;
}
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return NULL;
}
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#ifndef MSG_FASTOPEN
# define MSG_FASTOPEN 0x20000000
#endif
ssize_t sendto(int sockfd, const void *buf, size_t len, int flags,
const struct sockaddr *dest_addr, socklen_t addrlen) {
INIT();
PFUNC();
if (flags & MSG_FASTOPEN) {
if (!connect(sockfd, dest_addr, addrlen) && errno != EINPROGRESS) {
return -1;
}
dest_addr = NULL;
addrlen = 0;
flags &= ~MSG_FASTOPEN;
}
return true_sendto(sockfd, buf, len, flags, dest_addr, addrlen);
}