C functions for socks4 / socks5 list validation
As for PHP 5, I wrote two functions for socks 4 and socks 5 lists validation.
The code:
/**************************************************************************************
C functions for socks 4/5 checking by Paolo Ardoino < paolo.ardoino@gmail.com >
slchk_host is a linked list of all socks that you want to test.
IP must be in Ipv4 standard dot notation, port is the port of the socks and
type is set to 5 for socks5 and 4 for socks4.
try_socks4 and try_socks5 keep as argument a pointer to the list and return
1 if the host is a working socks5 , 0 otherwise .
**************************************************************************************/
// These are definitions of the strings for the socks protocol
#define SOCKS4HS "\004\001%c%c%c%c%c%c"
#define SOCKS5HS "\x05\x01%c"
#define SOCKS5RQ "\x05\x01%c\x03%c%s%c%c"
struct slchk_host {
char ip[18];
int port;
int type; //if type==5 use try_socks5 if type==4 use try_socks4
struct slchk_host *next, *prev;
};
int try_socks4(struct slchk_host *hs)
{
int sd, buflen = 0;
struct hostent *hent;
struct sockaddr_in sa;
char buf[BUFFER_SIZE];
if(!(hent = gethostbyname(hs->ip)))
return 0;
sa.sin_family = AF_INET;
sa.sin_port = htons(hs->port);
memcpy((char *) &sa.sin_addr.s_addr, hent->h_addr_list[0], hent->h_length);
if ((sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
return 0;
if (connect(sd, (struct sockaddr *)&sa, sizeof(struct sockaddr_in)) == -1) {
close(sd);
return 0;
}
buflen = snprintf (buf, BUFFER_SIZE, SOCKS4HS, (hs->port >> 8) & 0xFF, hs->port & 0xFF,
(char)hent->h_addr[0], (char)hent->h_addr[1], (char)hent->h_addr[2], (char)hent->h_addr[3]);
SOCKSSR;
close(sd);
printf("buf[1]=%d\n", buf[1]);
if(buf[1] == 90)
return 1;
return 0;
}
int try_socks5(struct slchk_host *hs)
{
int sd, buflen = 0;
struct hostent *hent;
struct sockaddr_in sa;
char buf[BUFFER_SIZE];
if(!(hent = gethostbyname(hs->ip)))
return 0;
sa.sin_family = AF_INET;
sa.sin_port = htons(hs->port);
memcpy((char *) &sa.sin_addr.s_addr, hent->h_addr_list[0], hent->h_length);
if ((sd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0)
return 0;
if (connect(sd, (struct sockaddr *)&sa, sizeof(struct sockaddr_in)) == -1) {
close(sd);
return 0;
}
buflen = snprintf(buf, BUFFER_SIZE, SOCKS5HS, 0);
SOCKSSR;
if(buf[0] != 0×05 || buf[1] != 0×00) {
close(sd);
return 0;
}
buflen = snprintf(buf, BUFFER_SIZE, SOCKS5RQ, 0, strlen("www.google.it"), "www.google.it", (80 >> 8) & 0xFF, 80 & 0xFF);
SOCKSSR;
close(sd);
if(buf[0] != 0×05 || buf[1] != 0×00)
return 0;
return 1;
}
Download this code: csockscheck.txt
