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Discard any messages which are buffered on the routing socket before using

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it otherwise the response to one of our routing messages could be lost due
to buffer overflow.
This commit is contained in:
Doug Rabson 1995-01-30 11:11:43 +00:00
parent 3f4fff96f9
commit 7cb18415b8
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=6034
1 changed files with 15 additions and 2 deletions
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17
libexec/bootpd/rtmsg.c
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@ -39,7 +39,7 @@
/*
* from arp.c 8.2 (Berkeley) 1/2/94
* $Id: rtmsg.c,v 1.1.1.1 1994/09/30 05:45:06 pst Exp $
* $Id: rtmsg.c,v 1.2 1995/01/16 18:57:45 dfr Exp $
*/
#include <sys/param.h>
@ -50,6 +50,7 @@
#if BSD >= 199306
#include <sys/socket.h>
#include <sys/filio.h>
#include <net/if.h>
#include <net/if_dl.h>
@ -85,6 +86,18 @@ static void getsocket () {
report(LOG_ERR, "socket %s", strerror(errno));
exit(1);
}
} else {
/*
* Drain the socket of any unwanted routing messages.
*/
int n;
char buf[512];
ioctl(s, FIONREAD, &n);
while (n > 0) {
read(s, buf, sizeof buf);
ioctl(s, FIONREAD, &n);
}
}
}
@ -228,7 +241,7 @@ static int rtmsg(cmd)
}
do {
l = read(s, (char *)&m_rtmsg, sizeof(m_rtmsg));
} while (l > 0 && (rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
} while (l > 0 && (rtm->rtm_type != cmd || rtm->rtm_seq != seq || rtm->rtm_pid != getpid()));
if (l < 0)
report(LOG_WARNING, "arp: read from routing socket: %s\n",
strerror(errno));