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Vendor fix: the routing table can change while we are fetching it from

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the kernel. Instead of complaining if we get an ENOMEM (meaning it got
larger than our buffer is) reallocate the buffer and loop.

Submitted by: maxim
This commit is contained in:
Hartmut Brandt 2006-01-10 11:59:31 +00:00
parent 2a9284a7c0
commit 9d165d9f13
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/vendor/bsnmp/dist/; revision=154184
1 changed files with 19 additions and 9 deletions
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28
contrib/bsnmp/snmp_mibII/mibII.c
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@ -1030,7 +1030,7 @@ u_char *
mib_fetch_rtab(int af, int info, int arg, size_t *lenp)
{
int name[6];
u_char *buf;
u_char *buf, *newbuf;
name[0] = CTL_NET;
name[1] = PF_ROUTE;
@ -1041,6 +1041,7 @@ mib_fetch_rtab(int af, int info, int arg, size_t *lenp)
*lenp = 0;
/* initial estimate */
if (sysctl(name, 6, NULL, lenp, NULL, 0) == -1) {
syslog(LOG_ERR, "sysctl estimate (%d,%d,%d,%d,%d,%d): %m",
name[0], name[1], name[2], name[3], name[4], name[5]);
@ -1049,15 +1050,24 @@ mib_fetch_rtab(int af, int info, int arg, size_t *lenp)
if (*lenp == 0)
return (NULL);
if ((buf = malloc(*lenp)) == NULL) {
syslog(LOG_ERR, "sysctl buffer: %m");
return (NULL);
}
buf = NULL;
for (;;) {
if ((newbuf = realloc(buf, *lenp)) == NULL) {
syslog(LOG_ERR, "sysctl buffer: %m");
free(buf);
return (NULL);
}
buf = newbuf;
if (sysctl(name, 6, buf, lenp, NULL, 0) == 0)
break;
if (sysctl(name, 6, buf, lenp, NULL, 0) == -1) {
syslog(LOG_ERR, "sysctl get: %m");
free(buf);
return (NULL);
if (errno != ENOMEM) {
syslog(LOG_ERR, "sysctl get: %m");
free(buf);
return (NULL);
}
*lenp += *lenp / 8 + 1;
}
return (buf);