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From 659bfd369dc6810ac5349c433455c0d317482354 Mon Sep 17 00:00:00 2001
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From: Steve Grubb <sgrubb@redhat.com>
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Date: Tue, 17 Oct 2017 14:31:46 -0400
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Subject: [PATCH] Fixup ipv6 server side binding
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---
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src/auditd-listen.c | 32 ++++++++++++++++++++++++++++++++
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2 files changed, 33 insertions(+)
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diff --git a/src/auditd-listen.c b/src/auditd-listen.c
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index 7a5c2c6..0d1717f 100644
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--- a/src/auditd-listen.c
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+++ b/src/auditd-listen.c
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@@ -914,6 +914,7 @@ int auditd_tcp_listen_init(struct ev_loop *loop, struct daemon_conf *config)
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struct addrinfo hints;
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char local[16];
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int one = 1, rc;
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+ int prefer_ipv6 = 0;
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ev_periodic_init(&periodic_watcher, periodic_handler,
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0, config->tcp_client_max_idle, NULL);
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@@ -929,6 +930,7 @@ int auditd_tcp_listen_init(struct ev_loop *loop, struct daemon_conf *config)
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memset(&hints, '\0', sizeof(hints));
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hints.ai_flags = AI_PASSIVE | AI_ADDRCONFIG;
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hints.ai_socktype = SOCK_STREAM;
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+ hints.ai_family = AF_UNSPEC;
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snprintf(local, sizeof(local), "%ld", config->tcp_listen_port);
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rc = getaddrinfo(NULL, local, &hints, &ai;;
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@@ -937,9 +939,32 @@ int auditd_tcp_listen_init(struct ev_loop *loop, struct daemon_conf *config)
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return 1;
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}
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+ {
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+ int ipv4 = 0, ipv6 = 0;
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nlsocks = 0;
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runp = ai;
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while (runp && nlsocks < N_SOCKS) {
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+ // Let's take a pass through and see what we got.
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+ if (runp->ai_family == AF_INET)
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+ ipv4++;
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+ else if (runp->ai_family == AF_INET6)
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+ ipv6++;
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+ runp = runp->ai_next;
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+ nlsocks++;
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+ }
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+
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+ if (nlsocks == 2 && ipv4 && ipv6)
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+ prefer_ipv6 = 1;
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+ }
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+
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+ nlsocks = 0;
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+ runp = ai;
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+ while (runp && nlsocks < N_SOCKS) {
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+ // On linux, ipv6 sockets by default include ipv4 so
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+ // we only need one.
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+ if (runp->ai_family == AF_INET && prefer_ipv6)
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+ goto next_try;
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+
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listen_socket[nlsocks] = socket(runp->ai_family,
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runp->ai_socktype, runp->ai_protocol);
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if (listen_socket[nlsocks] < 0) {
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@@ -950,6 +975,13 @@ int auditd_tcp_listen_init(struct ev_loop *loop, struct daemon_conf *config)
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/* This avoids problems if auditd needs to be restarted. */
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setsockopt(listen_socket[nlsocks], SOL_SOCKET, SO_REUSEADDR,
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(char *)&one, sizeof (int));
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+
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+ // If we had more than 2 addresses suggested we'll
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+ // separate the sockets.
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+ if (!prefer_ipv6 && runp->ai_family == AF_INET6)
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+ setsockopt(listen_socket[nlsocks], IPPROTO_IPV6,
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+ IPV6_V6ONLY, &one, sizeof(int));
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+
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set_close_on_exec(listen_socket[nlsocks]);
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if (bind(listen_socket[nlsocks], runp->ai_addr,
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