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32 lines
826 B
Diff
32 lines
826 B
Diff
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--- netkit-ntalk-0.17/talkd/talkd.c.orig 1999-09-29 02:04:15 +0400
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+++ netkit-ntalk-0.17/talkd/talkd.c 2004-09-05 19:20:50 +0400
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@@ -68,6 +68,7 @@ char talkd_rcsid[] =
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#define TIMEOUT 30
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#define MAXIDLE 120
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+#define MINUDPSRCPORT 1024
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#if !defined(MAXHOSTNAMELEN)
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#define MAXHOSTNAMELEN 64
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@@ -167,6 +168,7 @@ do_one_packet(void)
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struct sockaddr_in sn;
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int cc, i, ok;
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socklen_t addrlen;
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+ int theirport;
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addrlen = sizeof(sn);
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cc = recvfrom(0, inbuf, sizeof(inbuf), 0,
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@@ -194,6 +196,12 @@ do_one_packet(void)
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return;
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}
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+ theirport = ntohs(sn.sin_port);
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+ if (theirport < MINUDPSRCPORT) {
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+ syslog(LOG_WARNING, "%d: bad port", theirport);
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+ return;
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+ }
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+
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/*
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* If we get here we have an address we can reply to, although
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* it may not be good for much. If possible, reply to it, because
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