Akkariin/proxychains-ng
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Add option to change tcp destination port and ip before sending to proxy server

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This commit is contained in:
tom gilon
2020-05-06 00:33:42 +03:00
Unverified
parent b8fa2a7405
commit de31961349
3 changed files with 93 additions and 0 deletions
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src/libproxychains.c
+71
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@@ -72,6 +72,8 @@ int proxychains_quiet_mode = 0;
int proxychains_resolver = 0;
localaddr_arg localnet_addr[MAX_LOCALNET];
size_t num_localnet_addr = 0;
dnat_arg dnats[MAX_DNAT];
size_t num_dnats = 0;
unsigned int remote_dns_subnet = 224;
pthread_once_t init_once = PTHREAD_ONCE_INIT;
@@ -268,6 +270,8 @@ static void get_chain_data(proxy_data * pd, unsigned int *proxy_count, chain_typ
char *env;
char local_in_addr_port[32];
char local_in_addr[32], local_in_port[32], local_netmask[32];
char dnat_orig_addr_port[32], dnat_new_addr_port[32];
char dnat_orig_addr[32], dnat_orig_port[32], dnat_new_addr[32], dnat_new_port[32];
FILE *file = NULL;
if(proxychains_got_chain_data)
@@ -419,6 +423,55 @@ inv_host:
proxychains_quiet_mode = 1;
} else if(strstr(buff, "proxy_dns")) {
proxychains_resolver = 1;
} else if(strstr(buff, "dnat")) {
if(sscanf(buff, "%s %21[^ ] %21s\n", user, dnat_orig_addr_port, dnat_new_addr_port) < 3) {
fprintf(stderr, "dnat format error");
exit(1);
}
/* clean previously used buffer */
memset(dnat_orig_port, 0, sizeof(dnat_orig_port) / sizeof(dnat_orig_port[0]));
memset(dnat_new_port, 0, sizeof(dnat_new_port) / sizeof(dnat_new_port[0]));
(void)sscanf(dnat_orig_addr_port, "%15[^:]:%5s", dnat_orig_addr, dnat_orig_port);
(void)sscanf(dnat_new_addr_port, "%15[^:]:%5s", dnat_new_addr, dnat_new_port);
if(num_dnats < MAX_DNAT) {
int error;
error =
inet_pton(AF_INET, dnat_orig_addr,
&dnats[num_dnats].orig_dst);
if(error <= 0) {
fprintf(stderr, "dnat original destination address error\n");
exit(1);
}
error =
inet_pton(AF_INET, dnat_new_addr,
&dnats[num_dnats].new_dst);
if(error <= 0) {
fprintf(stderr, "dnat effective destination address error\n");
exit(1);
}
if(dnat_orig_port[0]) {
dnats[num_dnats].orig_port =
(short) atoi(dnat_orig_port);
} else {
dnats[num_dnats].orig_port = 0;
}
if(dnat_new_port[0]) {
dnats[num_dnats].new_port =
(short) atoi(dnat_new_port);
} else {
dnats[num_dnats].new_port = 0;
}
PDEBUG("added dnat: orig-dst=%s orig-port=%d new-dst=%s new-port=%d\n", dnat_orig_addr, dnats[num_dnats].orig_port, dnat_new_addr, dnats[num_dnats].new_port);
++num_dnats;
} else {
fprintf(stderr, "# of dnat exceed %d.\n", MAX_DNAT);
}
}
}
}
@@ -501,6 +554,24 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
// 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_dnats && !remote_dns_connect; i++) {
if(dnats[i].orig_dst.s_addr == p_addr_in->s_addr) {
if(!dnats[i].orig_port) {
p_addr_in = &dnats[i].new_dst;
if(dnats[i].new_port)
port = dnats[i].new_port;
break;
}
else if(dnats[i].orig_port == port) {
p_addr_in = &dnats[i].new_dst;
if (dnats[i].new_port)
port = dnats[i].new_port;
break;
}
}
}
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)) {