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Don't accept hole punch requests to local network

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This commit is contained in:
James R 2021-08-30 19:00:28 -07:00
parent eab8f99eab
commit 0f122fd5dd
1 changed files with 27 additions and 1 deletions
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28
src/i_tcp.c
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@ -599,11 +599,37 @@ void Command_Numnodes(void)
#endif #endif
#ifndef NONET #ifndef NONET
/* not one of the reserved "local" addresses */
static boolean
is_external_address (UINT32 p)
{
UINT8 a = (p & 255);
UINT8 b = ((p >> 8) & 255);
if (p == (UINT32)~0)/* 255.255.255.255 */
return 0;
switch (a)
{
case 0:
case 10:
case 127:
return false;
case 172:
return (b & ~15) != 16;/* 16 - 31 */
case 192:
return b != 168;
default:
return true;
}
}
static boolean hole_punch(ssize_t c) static boolean hole_punch(ssize_t c)
{ {
/* See ../doc/Holepunch-Protocol.txt */ /* See ../doc/Holepunch-Protocol.txt */
if (cv_rendezvousserver.string[0] && if (cv_rendezvousserver.string[0] &&
c == 10 && holepunchpacket->magic == hole_punch_magic) c == 10 && holepunchpacket->magic == hole_punch_magic &&
is_external_address(ntohl(holepunchpacket->addr)))
{ {
mysockaddr_t addr; mysockaddr_t addr;
addr.ip4.sin_family = AF_INET; addr.ip4.sin_family = AF_INET;