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nameserv: don't return scoped IPv6 addresses

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Ignore IPv6 addresses returned by getaddrinfo() that have a non-zero
scope ID to avoid silently ignoring the ID if it was specified with the
% sign in the provided string.

This can be removed when the scope ID is returned from the function and
the callers handle it.
This commit is contained in:
Miroslav Lichvar 2020-06-29 16:56:09 +02:00
parent 3fc72c0cfa
commit 59cf4e0b96
2 changed files with 4 additions and 0 deletions
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1
configure vendored
View file

@ -657,6 +657,7 @@ if [ $feat_ipv6 = "1" ] && \
struct sockaddr_in6 n;
char p[100];
n.sin6_addr = in6addr_any;
n.sin6_scope_id = 0;
return !inet_ntop(AF_INET6, &n.sin6_addr.s6_addr, p, sizeof(p));'
then
add_def FEAT_IPV6

3
nameserv.c
View file

@ -95,6 +95,9 @@ DNS_Name2IPAddress(const char *name, IPAddr *ip_addrs, int max_addrs)
case AF_INET6:
if (address_family != IPADDR_UNSPEC && address_family != IPADDR_INET6)
continue;
/* Don't return an address that would lose a scope ID */
if (((struct sockaddr_in6 *)ai->ai_addr)->sin6_scope_id != 0)
continue;
ip_addrs[i].family = IPADDR_INET6;
memcpy(&ip_addrs[i].addr.in6, &((struct sockaddr_in6 *)ai->ai_addr)->sin6_addr.s6_addr,
sizeof (ip_addrs->addr.in6));