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<hr><p align="left"><small>/* socks_v5.c, by Digger, functions for socks version5, please reference rfc <br>
* 1928 and 1929 for more details */ <br>
<br>
#include <stdio.h> <br>
#include <string.h> <br>
#include <signal.h> <br>
#include <sys/types.h> <br>
#include <sys/socket.h> <br>
#include <sys/time.h> <br>
#include <sys/select.h> <br>
#include <netinet/in.h> <br>
#include <netdb.h> <br>
#include <unistd.h> <br>
#include <shadow.h> <br>
#include <crypt.h> <br>
#include <errno.h> <br>
#include "socks.h" <br>
<br>
extern int errno; <br>
extern u_char ver; /* socks version, 4 or 5 */ <br>
<br>
u_char cur_method = NO_AUTH_REQUIRE; /* currently using method */ <br>
<br>
<br>
int get_valid_method(u_char *methods, int nmethods) <br>
{ <br>
int i, j; <br>
for (i = 0; i < nmethods; i ++) { <br>
if (methods[i] == cur_method) return TRUE; <br>
} <br>
return FALSE; <br>
} <br>
<br>
void handle_auth_v5(int sockfd) /* username/password authentication for <br>
* socks version 5, see rfc 1929 */ <br>
{ <br>
u_char ulen; <br>
u_char username[256]; <br>
u_char plen; <br>
u_char password[256]; <br>
struct spwd *p_spwd; <br>
char salt[2]; <br>
u_char buf[4]; <br>
<br>
get_version(sockfd); <br>
read_chars(sockfd, &ulen, 1); <br>
read_chars(sockfd, username, (int)ulen); <br>
username[ulen] = '\0'; <br>
#ifdef DEBUG <br>
fprintf(stderr, "username: %s\n", username); <br>
#endif <br>
read_chars(sockfd, &plen, 1); <br>
read_chars(sockfd, password, (int)plen); <br>
password[plen] = '\0'; <br>
#ifdef DEBUG <br>
fprintf(stderr, "password: %s\n", password); <br>
#endif <br>
<br>
if ((p_spwd = getspnam(username)) == NULL) goto AUTH_FAIL; <br>
salt[0] = p_spwd->sp_pwdp[0]; <br>
salt[1] = p_spwd->sp_pwdp[1]; <br>
salt[2] = '\0'; <br>
if (strcmp(p_spwd->sp_pwdp, crypt(password, salt)) == 0) { <br>
buf[0] = ver; <br>
buf[1] = 0; <br>
write_chars(sockfd, buf, 2); <br>
#ifdef DEBUG <br>
fprintf(stderr, "authentication OK\n", password); <br>
#endif <br>
return; <br>
} <br>
AUTH_FAIL: <br>
buf[0] = ver; <br>
buf[1] = 0xFF; <br>
write_chars(sockfd, buf, 2); <br>
#ifdef DEBUG <br>
fprintf(stderr, "authentication FAIL\n", password); <br>
#endif <br>
close_and_exit(sockfd); <br>
} <br>
<br>
void handle_methods_v5(int sockfd) <br>
{ <br>
int i; <br>
u_char nmethods; /* methods number */ <br>
u_char methods[256]; /* methods */ <br>
u_char buf[64]; <br>
<br>
read_chars(sockfd, &nmethods, 1); <br>
#ifdef DEBUG <br>
#ifdef DEBUG <br>
fprintf(stderr, "methods number: %u\n", nmethods); <br>
#endif <br>
read_chars(sockfd, methods, (int)nmethods); <br>
#ifdef DEBUG <br>
fprintf(stderr, "methods:"); <br>
for (i = 0;i < nmethods;i ++) <br>
fprintf(stderr, " %u", methods[i]); <br>
fprintf(stderr, "\n"); <br>
#endif <br>
if (get_valid_method(methods, nmethods) == FALSE) { <br>
buf[0] = ver; <br>
buf[1] = 0xFF; <br>
write_chars(sockfd, buf, 2); <br>
#ifdef DEBUG <br>
fprintf(stderr, "reply bad method %u OK\n", cur_method); <br>
#endif <br>
close_and_exit(sockfd); <br>
} else { <br>
buf[0] = ver; <br>
buf[1] = cur_method; <br>
write_chars(sockfd, buf, 2); <br>
#ifdef DEBUG <br>
#ifdef DEBUG <br>
fprintf(stderr, "reply supported method %u OK\n", cur_method); <br>
#endif <br>
} <br>
if (cur_method == USER_AND_PASS) handle_auth_v5(sockfd); <br>
} <br>
<br>
void reply_command_v5( int sockfd, <br>
u_char cmd, <br>
u_char atyp, <br>
u_char addr_len, <br>
u_char *bnd_addr, <br>
u_short bnd_port ) <br>
{ <br>
u_char buf[512]; <br>
int n = 0; <br>
buf[n ++] = ver; <br>
buf[n ++] = cmd; <br>
buf[n ++] = 0; <br>
buf[n ++] = atyp; <br>
if (addr_len > 0) { <br>
buf[n ++] = addr_len; <br>
bcopy(bnd_addr, &buf[n], addr_len); <br>
n += addr_len; <br>
} else { <br>
bcopy(bnd_addr, &buf[n], 4); <br>
n += 4; <br>
} <br>
bcopy(&bnd_port, &buf[n], 2); <br>
n += 2; <br>
write_chars(sockfd, buf, n); <br>
} <br>
<br>
int handle_command_v5(int sockfd) <br>
{ <br>
u_char cmd; /* client command */ <br>
u_char rsv; /* reserved */ <br>
u_char atyp; /* address type */ <br>
struct in_addr dst_addr_ip; /* destination host IP */ <br>
u_char dst_addr_len; /* domain length */ <br>
u_char dst_addr_domain[256]; /* destination host domain */ <br>
u_short dst_port; /* destination port */ <br>
struct hostent *hp; <br>
<br>
get_version(sockfd); <br>
read_chars(sockfd, &cmd, 1); <br>
#ifdef DEBUG <br>
fprintf(stderr, "command: %u\n", cmd); <br>
#endif <br>
read_chars(sockfd, &rsv, 1); <br>
read_chars(sockfd, &atyp, 1); <br>
#ifdef DEBUG <br>
fprintf(stderr, "address type: %u\n", atyp); <br>
#endif <br>
switch (atyp) { <br>
case IPV4: <br>
read_chars(sockfd, (u_char *)&dst_addr_ip, 4); <br>
read_chars(sockfd, (u_char *)&dst_port, 2); <br>
#ifdef DEBUG <br>
fprintf(stderr, "dst_addr: %s, dst_port: %u\n", <br>
inet_ntoa(dst_addr_ip), ntohs(dst_port)); <br>
#endif <br>
break; <br>
case DOMAINNAME: <br>
read_chars(sockfd, &dst_addr_len, 1); <br>
#ifdef DEBUG <br>
fprintf(stderr, "dst_addr_len: %u\n", dst_addr_len); <br>
#endif <br>
read_chars(sockfd, dst_addr_domain, (int)dst_addr_len); <br>
dst_addr_domain[dst_addr_len] = '\0'; <br>
read_chars(sockfd, (u_char *)&dst_port, 2); <br>
#ifdef DEBUG <br>
fprintf(stderr, "dst_addr:%s, dst_port: %d\n", <br>
dst_addr_domain, ntohs(dst_port)); <br>
#endif <br>
if ((hp = gethostbyname(dst_addr_domain)) == NULL) { <br>
reply_command_v5(sockfd, GENERAL_FAILURE, <br>
DOMAINNAME, dst_addr_len, <br>
dst_addr_domain, dst_port); <br>
close_and_exit(sockfd); <br>
} else { <br>
<br>
bcopy( hp->h_addr_list[0], &dst_addr_ip, <br>
hp->h_length); <br>
#ifdef DEBUG <br>
fprintf(stderr, "dst_addr: %s\n", <br>
inet_ntoa(dst_addr_ip)); <br>
#endif <br>
} <br>
break; <br>
default: <br>
reply_command_v5(sockfd, ADDR_NOT_SUPPORT, atyp, <br>
0, NULL, (u_short)0); <br>
} <br>
if (cmd != CONNECT && cmd != BIND) { <br>
reply_command_v5(sockfd, CMD_NOT_SUPPORT, atyp, 0, <br>
&dst_addr_ip.s_addr, dst_port); <br>
close_and_exit(sockfd); <br>
} else if (cmd == CONNECT) { <br>
if (creat_connect_sock(dst_addr_ip.s_addr, dst_port) == FALSE) { <br>
<br>
reply_command_v5(sockfd, GENERAL_FAILURE, atyp, <br>
0, &dst_addr_ip.s_addr, dst_port); <br>
close_and_exit(sockfd); <br>
} else { <br>
reply_command_v5(sockfd, SUCCESS, atyp, <br>
0, &dst_addr_ip.s_addr, dst_port); <br>
} <br>
} else if (cmd == BIND) { <br>
if (creat_bind_sock(&dst_addr_ip.s_addr, &dst_port) == FALSE) { <br>
reply_command_v5(sockfd, GENERAL_FAILURE, atyp, <br>
<br>
0, &dst_addr_ip.s_addr, dst_port); <br>
close_and_exit(sockfd); <br>
} else { <br>
reply_command_v5(sockfd, SUCCESS, atyp, <br>
0, &dst_addr_ip.s_addr, dst_port); <br>
} <br>
if (wait_connect_in(&dst_addr_ip.s_addr, &dst_port) == FALSE) { <br>
reply_command_v5(sockfd, GENERAL_FAILURE, atyp, <br>
0, &dst_addr_ip.s_addr, dst_port); <br>
close_and_exit(sockfd); <br>
} else { <br>
reply_command_v5(sockfd, SUCCESS, atyp, <br>
0, &dst_addr_ip.s_addr, dst_port); <br>
} <br>
} <br>
} <br>
</small><hr>
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