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dnat: add rule precedence logic

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This commit is contained in:
tom gilon
2020-07-08 19:35:18 +03:00
parent de31961349
commit bf2ef2ce38
1 changed files with 15 additions and 15 deletions
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30
src/libproxychains.c
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@@ -520,6 +520,7 @@ int connect(int sock, const struct sockaddr *addr, unsigned int len) {
struct in_addr *p_addr_in;
struct in6_addr *p_addr_in6;
dnat_arg *dnat = NULL;
unsigned short port;
size_t i;
int remote_dns_connect = 0;
@@ -554,22 +555,21 @@ 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;
// more specific first
if (!v6) for(i = 0; i < num_dnats && !remote_dns_connect && !dnat; i++)
if((dnats[i].orig_dst.s_addr == p_addr_in->s_addr))
if(dnats[i].orig_port && (dnats[i].orig_port == port))
dnat = &dnats[i];
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_dnats && !remote_dns_connect && !dnat; i++)
if(dnats[i].orig_dst.s_addr == p_addr_in->s_addr)
if(!dnats[i].orig_port)
dnat = &dnats[i];
if (dnat) {
p_addr_in = &dnat->new_dst;
if (dnat->new_port)
port = dnat->new_port;
}
if (!v6) for(i = 0; i < num_localnet_addr && !remote_dns_connect; i++) {