On Sun, 2 May 2021, D. Hugh Redelmeier wrote:
Subject: [Swan-dev] get rid of getnetbyname() /etc/networks?
Comments I added recently:
+ /*
+ * try a name from /etc/networks
+ *
+ * Seems pretty obsolete:
+ * - latest RFC, 1101, dated April 1989
+ * - IPv4 only
+ * - doesn't support classless networks
+ * - Window has it
+ */
We are using this as a fallback when DNS doesn't resolve a name.
We are not even using it to find a network, only an IP address.
kill it :)
Related, there are still a few places that end up calling
gethostbyname2() which is also obsolete and does not work for IPv6:
lib/libswan/ttoaddress.c: struct hostent *h = gethostbyname2(p, af);
programs/showhostkey/showhostkey.c: gethostname(qname, sizeof(qname));
The case in ttoaddress.c is the main one. Since it is used by
ttoaddress_dns() which is used in many places, we cannot replace it
with an async libunbound call. And to do a sync unbound call, last I
looked at this years ago, we would have to start another libunbound
context which gets its own cachce. Also, it would mean people can no
longer compile without libunbound. I guess the best fix would be to
rewrite it to use getaddrinfo() or res_ functions?
Paul
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