Fix "Hostname" parsing in OpenSSH config files, as reported
at <https://red.libssh.org/issues/260>.

From: Niels Ole Salscheider <niels_ole@salscheider-online.de>
Date: Mon, 8 May 2017 17:36:13 +0200
Subject: [PATCH] Fix reading of the first parameter

This is a fixup for 7b8b5eb4eac314a3a29be812bef0264c6611f6e7.
Previously, it would return as long as the parameter was _not_ seen
before. It also did not handle the case for the unsupported opcode (-1)
which would cause a segfault when accessing the "seen" array.
---
 src/config.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/config.c b/src/config.c
index 7c03b27..238a655 100644
--- a/src/config.c
+++ b/src/config.c
@@ -218,8 +218,9 @@ static int ssh_config_parse_line(ssh_session session, const char *line,
   }
 
   opcode = ssh_config_get_opcode(keyword);
-  if (*parsing == 1 && opcode != SOC_HOST) {
-      if (seen[opcode] == 0) {
+  if (*parsing == 1 && opcode != SOC_HOST &&
+      opcode > SOC_UNSUPPORTED && opcode < SOC_END) {
+      if (seen[opcode] == 1) {
           return 0;
       }
       seen[opcode] = 1;
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<tr><td><span title='2018-06-14 00:52:30 +0200'>2018-06-14</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=2b78360138a7043e868875137c40266bd1c75dce'>gnu: sssd: Update to 1.16.2.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2018-03-11 06:42:57 +0100'>2018-03-11</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=1bc11c5ddb3d5dde66da7d61d5fd6ac1ed20f502'>gnu: sssd: Update to 1.16.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-11-04 00:07:40 +0100'>2017-11-04</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=d3f140218b4384704a99746993a16370f5cc40b3'>gnu: sssd: Disable failing test.</a><span class='msg-avail'>...</span></td><td>Marius Bakke</td></tr>
<tr><td><span title='2017-10-25 18:13:08 +0200'>2017-10-25</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=65808ba4eccf59f07b72bf68c90d256d01dde80f'>gnu: sssd: Add missing word to description.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-10-25 18:13:08 +0200'>2017-10-25</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=06c13046525fc1068625eda0efe588c121002a90'>gnu: sssd: Update to 1.16.0.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-10-25 18:13:08 +0200'>2017-10-25</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=3d96f2320aa30379821315859116a829a0970c7b'>gnu: ding-libs: Update to 0.6.1.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-07-29 01:08:17 +0200'>2017-07-29</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=4f9dd97e658a8ddc1b672de7af0af8b8aaa4749f'>gnu: sssd: Update to 1.15.3.</a><span class='msg-avail'>...</span></td><td>Tobias Geerinckx-Rice</td></tr>
<tr><td><span title='2017-05-16 00:00:03 +0200'>2017-05-16</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=a068300628e9490d7db3f610699ea8c693946e3d'>gnu: bind: Rename variable to 'isc-bind'.</a><span class='msg-avail'>...</span></td><td>Ludovic Courtès</td></tr>
<tr><td><span title='2017-05-15 21:28:29 +0200'>2017-05-15</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=7fe4e556c03289753b1594e257446fb0306c44b7'>gnu: Add sssd.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>
<tr><td><span title='2017-05-15 21:26:50 +0200'>2017-05-15</span></td><td><a href='/guix/commit/gnu/packages/sssd.scm?id=dbe874dcbf349b1629a7222db3d7c14241ad5606'>gnu: Add ding-libs.</a><span class='msg-avail'>...</span></td><td>Ricardo Wurmus</td></tr>