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Add comment to ioa_addr_is_zero

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Mészáros Mihály 2020-12-10 14:15:26 +01:00
parent 9c7deff4b8
commit dd0ffdb51a
1 changed files with 6 additions and 0 deletions
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6
src/client/ns_turn_ioaddr.c
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@ -496,6 +496,12 @@ int ioa_addr_is_loopback(ioa_addr *addr)
return 0; return 0;
} }
/*
To avoid a vulnerability this function checks whether the addr is in 0.0.0.0/8 or ::/128.
Source from (INADDR_ANY) 0.0.0.0/32 and (in6addr_any) ::/128 routed to loopback on Linux systems for old BSD backward compatibility.
https://github.com/torvalds/linux/blob/a2f5ea9e314ba6778f885c805c921e9362ec0420/net/ipv6/tcp_ipv6.c#L182
To avoid any trouble we match the whole 0.0.0.0/8 that defined in RFC6890 as local network "this".
*/
int ioa_addr_is_zero(ioa_addr *addr) int ioa_addr_is_zero(ioa_addr *addr)
{ {
if(addr) { if(addr) {