return the requested string as the "canonical name" for numeric addresses

previously NULL was returned in ai_canonname, resulting in crashes in
some callers. this behavior was incorrect. note however that the new
behavior differs from glibc, which performs reverse dns lookups. POSIX
is very clear that a reverse DNS lookup must not be performed for
numeric addresses.

diff --git a/src/network/getaddrinfo.c b/src/network/getaddrinfo.c
index 8126236..c0f135f 100644 (file)
--- a/src/network/getaddrinfo.c
+++ b/src/network/getaddrinfo.c
@@ -117,6 +117,7 @@ int getaddrinfo(const char *host, const char *serv, const struct addrinfo *hint,
                buf->ai.ai_addr = (void *)&buf->sa;
                buf->ai.ai_addrlen = family==AF_INET6 ? sizeof sa.sin6 : sizeof sa.sin;
                buf->ai.ai_family = family;
+               buf->ai.ai_canonname = (char *)host;
                buf->sa = sa;
                buf->sa.sin.sin_port = port;
                *res = &buf->ai;