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From 8302f576f8b41f9aa95b091a9ef001ab5ddc2ef5 Mon Sep 17 00:00:00 2001
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From: Ray Strode <rstrode@redhat.com>
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Date: Fri, 6 May 2022 14:23:59 -0400
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Subject: [PATCH] Automatically disable inet6 transport if ipv6 is disabled on
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machine
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If a machine is booted with ipv6.disable=1, trying to bind to an
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AF_INET6 socket will fail with AFNOSUPPORT.
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The tcp transport automatically falls back to ipv4 in this case, but
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the more specific inet6 transport just fails.
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This failure leads to MakeAllCOTSServerListeners returning a partial
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success.
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Unfortunately, the X server can't really contiue with partial successes
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from this function if -displayfd is in use, since that would, in other
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cases, potentially lead to the -displayfd electing a display number that
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is potentially partially in use by a rogue program.
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This commit addresses the issue by automatically disabling transports
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when they fail with AFNOSUPPORT, leading them to get ignored, rather than
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proceeding and ultimately returning from MakeAllCOTSServerListerns with
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partial=TRUE.
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---
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Xtranssock.c | 15 +++++++++++----
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1 file changed, 11 insertions(+), 4 deletions(-)
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diff --git a/Xtranssock.c b/Xtranssock.c
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index 632c1b5..2c80a5c 100644
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--- a/Xtranssock.c
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+++ b/Xtranssock.c
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@@ -584,66 +584,73 @@ TRANS(SocketOpenCOTSClient) (Xtransport *thistrans, const char *protocol,
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const char *host, const char *port)
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{
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return TRANS(SocketOpenCOTSClientBase)(
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thistrans->TransName, protocol, host, port, -1);
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}
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#endif /* TRANS_CLIENT */
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#ifdef TRANS_SERVER
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static XtransConnInfo
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TRANS(SocketOpenCOTSServer) (Xtransport *thistrans, const char *protocol,
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const char *host, const char *port)
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{
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XtransConnInfo ciptr;
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int i = -1;
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prmsg (2,"SocketOpenCOTSServer(%s,%s,%s)\n", protocol, host, port);
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SocketInitOnce();
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while ((i = TRANS(SocketSelectFamily) (i, thistrans->TransName)) >= 0) {
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if ((ciptr = TRANS(SocketOpen) (
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i, Sockettrans2devtab[i].devcotsname)) != NULL)
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break;
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}
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if (i < 0) {
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- if (i == -1)
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- prmsg (1,"SocketOpenCOTSServer: Unable to open socket for %s\n",
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- thistrans->TransName);
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- else
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+ if (i == -1) {
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+ if (errno == EAFNOSUPPORT) {
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+ thistrans->flags |= TRANS_NOLISTEN;
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+ prmsg (1,"SocketOpenCOTSServer: Socket for %s unsupported on this system.\n",
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+ thistrans->TransName);
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+ } else {
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+ prmsg (1,"SocketOpenCOTSServer: Unable to open socket for %s\n",
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+ thistrans->TransName);
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+ }
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+ } else {
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prmsg (1,"SocketOpenCOTSServer: Unable to determine socket type for %s\n",
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thistrans->TransName);
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+ }
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return NULL;
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}
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/*
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* Using this prevents the bind() check for an existing server listening
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* on the same port, but it is required for other reasons.
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*/
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#ifdef SO_REUSEADDR
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/*
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* SO_REUSEADDR only applied to AF_INET && AF_INET6
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*/
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if (Sockettrans2devtab[i].family == AF_INET
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#if defined(IPv6) && defined(AF_INET6)
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|| Sockettrans2devtab[i].family == AF_INET6
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#endif
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)
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{
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int one = 1;
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setsockopt (ciptr->fd, SOL_SOCKET, SO_REUSEADDR,
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(char *) &one, sizeof (int));
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}
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#endif
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#ifdef IPV6_V6ONLY
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if (Sockettrans2devtab[i].family == AF_INET6)
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{
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int one = 1;
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setsockopt(ciptr->fd, IPPROTO_IPV6, IPV6_V6ONLY, &one, sizeof(int));
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}
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--
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2.35.1
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