From: simonov at gmail dot com
Operating system: FreeBSD 7.2
PHP version: 5.2.9
PHP Bug Type: SNMP related
Bug description: Script hangs on snmprealwalk if OID is not increasing
Description:
------------
snmprealwalk function gets into indefinite loop if OID is not
increasing, so script hangs.
The following change corrects the problem:
--- snmp.c.orig 2009-05-22 10:12:14.000000000 +0600
+++ snmp.c 2009-05-22 10:17:58.000000000 +0600
@@ -490,9 +490,16 @@
if (st >= SNMP_CMD_WALK && st
!= SNMP_CMD_SET) {
if (vars->type !=
SNMP_ENDOFMIBVIEW &&
vars->type !=
SNMP_NOSUCHOBJECT && vars->type != SNMP_NOSUCHINSTANCE) {
- memmove((char
*)name, (char *)vars->name,vars->name_length * sizeof(oid));
- name_length =
vars->name_length;
- keepwalking =
1;
+ if
(snmp_oid_compare(name, name_length,
+
vars->name,
+
vars->name_length) >= 0) {
+
php_error_docref(NULL TSRMLS_CC, E_WARNING, "Error: OID not
increasing: %s",name);
+
keepwalking = 0;
+ } else {
+
memmove((char *)name, (char *)vars->name,vars->name_length *
sizeof(oid));
+
name_length = vars->name_length;
+
keepwalking = 1;
+ }
}
}
}
Reproduce code:
---------------
$temp_array = @snmprealwalk("$hostname:$port", "$community", "$oid",
($timeout * 1000), $retries);
Expected result:
----------------
(snip from tcpdump):
10:19:10.392849 IP 3.3.3.3.161 > 1.1.1.1.50706: GetResponse(34)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1=2
10:19:10.392908 IP 1.1.1.1.50706 > 3.3.3.3.161: GetNextRequest(33)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1
10:19:10.422741 IP 3.3.3.3.161 > 1.1.1.1.50706: GetResponse(34)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1=1
10:19:10.444217 IP 1.1.1.1.58395 > 3.3.3.3.161: GetRequest(28)
.1.3.6.1.2.1.1.3.0
Actual result:
--------------
Indefinite cycle (snip from tcpdump):
10:00:34.955679 IP 3.3.3.3.161 > 1.1.1.1.51705: GetResponse(34)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1=1
10:00:34.955787 IP 1.1.1.1.51705 > 3.3.3.3.161: GetNextRequest(33)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1
10:00:34.985357 IP 3.3.3.3.161 > 1.1.1.1.51705: GetResponse(34)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1=1
10:00:34.985452 IP 1.1.1.1.51705 > 3.3.3.3.161: GetNextRequest(33)
.1.3.6.1.2.1.4.20.1.2.127.0.0.1
--
Edit bug report at http://bugs.php.net/?id=48359&edit=1
--
Try a CVS snapshot (PHP 5.2):
http://bugs.php.net/fix.php?id=48359&r=trysnapshot52
Try a CVS snapshot (PHP 5.3):
http://bugs.php.net/fix.php?id=48359&r=trysnapshot53
Try a CVS snapshot (PHP 6.0):
http://bugs.php.net/fix.php?id=48359&r=trysnapshot60
Fixed in CVS:
http://bugs.php.net/fix.php?id=48359&r=fixedcvs
Fixed in CVS and need be documented:
http://bugs.php.net/fix.php?id=48359&r=needdocs
Fixed in release:
http://bugs.php.net/fix.php?id=48359&r=alreadyfixed
Need backtrace:
http://bugs.php.net/fix.php?id=48359&r=needtrace
Need Reproduce Script:
http://bugs.php.net/fix.php?id=48359&r=needscript
Try newer version:
http://bugs.php.net/fix.php?id=48359&r=oldversion
Not developer issue:
http://bugs.php.net/fix.php?id=48359&r=support
Expected behavior:
http://bugs.php.net/fix.php?id=48359&r=notwrong
Not enough info:
http://bugs.php.net/fix.php?id=48359&r=notenoughinfo
Submitted twice:
http://bugs.php.net/fix.php?id=48359&r=submittedtwice
register_globals:
http://bugs.php.net/fix.php?id=48359&r=globals
PHP 4 support discontinued: http://bugs.php.net/fix.php?id=48359&r=php4
Daylight Savings: http://bugs.php.net/fix.php?id=48359&r=dst
IIS Stability:
http://bugs.php.net/fix.php?id=48359&r=isapi
Install GNU Sed:
http://bugs.php.net/fix.php?id=48359&r=gnused
Floating point limitations:
http://bugs.php.net/fix.php?id=48359&r=float
No Zend Extensions:
http://bugs.php.net/fix.php?id=48359&r=nozend
MySQL Configuration Error:
http://bugs.php.net/fix.php?id=48359&r=mysqlcfg
