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Subject: [Bug 252095] syslogd not sending hostname to loghost
Date: Thu, 24 Dec 2020 03:09:24 +0000
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X-Bugzilla-Severity: Affects Some People
X-Bugzilla-Who: raj@gusw.net
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=3D252095
Bug ID: 252095
Summary: syslogd not sending hostname to loghost
Product: Base System
Version: Unspecified
Hardware: Any
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: bin
Assignee: bugs@FreeBSD.org
Reporter: raj@gusw.net
When remote logging, the syslogd does not send the hostname over to the
loghost.=20
Example, in syslog client's syslog.conf
*.* /var/log/all.log
*.* @loghost
syslog server is started with=20
syslogd -a 0.0.0.0/0 -H=20
(network can be constraint, doesn't matter). The /etc/hosts nor DNS may have
all the hosts registered, it is not important or even desirable that the sy=
slog
server translates the IP address to a hostname, hence the -H flag.
Now, when I do=20
logger -h loghost -H pb00 test
the loghost's syslogd receives the "pb00" hostname and logs it.=20
When I do
logger -h loghost test
then also the syslogd recieves the client's current hostname and logs it.
But when intermediating through the client's own syslogd
logger test
then the client's syslogd will not send its hostname over to the loghost, a=
nd
then the loghost will attempt to decode the hostname via DNS or /etc/hosts.=
I
think the syslogd should send its hostname over to the client, or the hostn=
ame
which it originally received.=20
Interestingly, the above command will log the own hostname in the all.log l=
og
file on the syslogd client, which will forward to the loghost without infor=
ming
its own idea of its hostname.
logger -H xx00 test
interestingly, that also does not log the xx00 name on the local syslogd in
all.log even if I started the local syslogd with the -H flag.
I consider this behavior a bug in that there is no reason why the syslogd
should withhold its own idea of its hostname or the original hostname provi=
ded
in the log message on to the remote logger.=20
I browsed through the source code and couldn't immediately find how I could
quickly fix this, but it seems the issue is somewhere here around line 1790:
lsent =3D 0;
for (r =3D f->fu_forw_addr; r; r =3D r->ai_next) {
memset(&msghdr, 0, sizeof(msghdr));
msghdr.msg_name =3D r->ai_addr;
msghdr.msg_namelen =3D r->ai_addrlen;
msghdr.msg_iov =3D il->iov;
msghdr.msg_iovlen =3D il->iovcnt;
STAILQ_FOREACH(sl, &shead, next) {
if (sl->sl_ss.ss_family =3D=3D AF_LOCAL ||
sl->sl_ss.ss_family =3D=3D AF_UNSPEC ||
sl->sl_socket < 0)
continue;
lsent =3D sendmsg(sl->sl_socket, &msghdr, 0=
);
if (lsent =3D=3D (ssize_t)il->totalsize)
break;
}
if (lsent =3D=3D (ssize_t)il->totalsize && !send_to=
_all)
break;
}
when I looked at the packets with tcpdump, it seemed that the forwarded pac=
kets
had no hostname of any kind in it.
--=20
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