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51 lines
1.9 KiB
51 lines
1.9 KiB
From 7a1a825c7b77785f256e05b1e3ac7676c7485a5c Mon Sep 17 00:00:00 2001 |
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From: Karel Zak <kzak@redhat.com> |
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Date: Tue, 4 Jul 2017 12:50:39 +0200 |
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Subject: [PATCH 135/135] login: use IPv4 on IPv4-mapping-to-IPv6 |
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It seems that on some systems (e.g. RHEL7) the libc function |
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getaddrinfo() is not able to translate ::ffff: address to IPv4. The |
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result is 0.0.0.0 host address in the last(1) and utmpdump(1) output. |
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/sbin/login -h "::ffff:192.168.1.7" |
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utmpdump: |
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[7] [03926] [1 ] [user1 ] [pts/1 ] [::ffff:192.168.1.7 ] [0.0.0.0 ] [Thu May 12 17:49:50 2016 ] |
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Not sure if this is about order of the getaddrinfo() results, system |
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configuration or libc version. It's irrelevant for login(1). We have |
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to be robust enough to write usable address to log files everywhere. |
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The solution is to detect IPv4-mapping-to-IPv6 and use IPv4 for utmp. |
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Upstream: http://github.com/karelzak/util-linux/commit/1c8792f1ae7fa38cf1d4418ad99c207f65dfdb1a |
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Addresses: https://bugzilla.redhat.com/show_bug.cgi?id=1296233 |
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Signed-off-by: Karel Zak <kzak@redhat.com> |
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--- |
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login-utils/login.c | 9 ++++++++- |
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1 file changed, 8 insertions(+), 1 deletion(-) |
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diff --git a/login-utils/login.c b/login-utils/login.c |
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index e0e960f88..5c36953ef 100644 |
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--- a/login-utils/login.c |
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+++ b/login-utils/login.c |
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@@ -1101,8 +1101,15 @@ static void init_remote_info(struct login_context *cxt, char *remotehost) |
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} else if (info->ai_family == AF_INET6) { |
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struct sockaddr_in6 *sa = |
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(struct sockaddr_in6 *) info->ai_addr; |
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+#ifdef IN6_IS_ADDR_V4MAPPED |
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+ if (IN6_IS_ADDR_V4MAPPED(&sa->sin6_addr)) { |
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+ const uint8_t *bytes = sa->sin6_addr.s6_addr; |
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+ struct in_addr addr = { *(const in_addr_t *) (bytes + 12) }; |
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- memcpy(cxt->hostaddress, &(sa->sin6_addr), sizeof(sa->sin6_addr)); |
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+ memcpy(cxt->hostaddress, &addr, sizeof(struct in_addr)); |
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+ } else |
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+#endif |
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+ memcpy(cxt->hostaddress, &(sa->sin6_addr), sizeof(sa->sin6_addr)); |
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} |
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freeaddrinfo(info); |
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} |
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-- |
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2.13.6
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