Hi all,
Under IPv6 environment, sent snmptrap after setting clientaddr in
snmp.conf, It is sent from another interface.
Test Details.. (*net-snmp-5.7.2.1)*
[root@cghvhp1 ~]# cat /etc/snmp/snmp.conf
clientaddr 2001:ccc1::2
[root@cghvhp1 ~]#
[root@cghvhp1 snmp]# ifconfig eth3
eth3 Link encap:Ethernet HWaddr 2C:44:FD:7D:D8:F1
inet addr:192.168.110.1 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: 2001:ccc1::1/0 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:5342 errors:0 dropped:13 overruns:0 frame:0
TX packets:130 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:693454 (677.2 KiB) TX bytes:15878 (15.5 KiB)
Interrupt:36
[root@cghvhp1 snmp]# ifconfig eth4
eth4 Link encap:Ethernet HWaddr 2C:44:FD:7D:D8:F2
inet addr:192.168.110.2 Bcast:192.168.255.255 Mask:255.255.0.0
inet6 addr: 2001:ccc1::2/0 Scope:Global
UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1
RX packets:21 errors:0 dropped:0 overruns:0 frame:0
TX packets:38 errors:0 dropped:0 overruns:0 carrier:0
collisions:0 txqueuelen:1000
RX bytes:2874 (2.8 KiB) TX bytes:5946 (5.8 KiB)
Interrupt:32
[root@cghvhp1 snmp]#
snmptrap is sent from eth3 while clientaddr is set to eth4.
I looked into IPv4 code and feel like same code is missing under IPv6
section.
Sending missing code section from IPv6 in
*snmplib/transports/snmpUDPIPv6Domain.c*
diff --git a/snmplib/transports/snmpUDPIPv6Domain.c
b/snmplib/transports/snmpUDPIPv6Domain.c
index b3eaae4..85a2f7a 100644
--- a/snmplib/transports/snmpUDPIPv6Domain.c
+++ b/snmplib/transports/snmpUDPIPv6Domain.c
@@ -190,6 +190,7 @@ netsnmp_udp6_transport(struct sockaddr_in6 *addr, int
local)
{
netsnmp_transport *t = NULL;
int rc = 0;
+ char *client_socket = NULL;
#ifdef NETSNMP_NO_LISTEN_SUPPORT
if (local)
@@ -267,10 +268,29 @@ netsnmp_udp6_transport(struct sockaddr_in6 *addr, int
local)
#endif /* NETSNMP_NO_LISTEN_SUPPORT */
} else {
/*
+ * This is a client session. If we've been given a
+ * client address to send from, then bind to that.
+ * Otherwise the send will use "something sensible".
+ */
+ client_socket = netsnmp_ds_get_string(NETSNMP_DS_LIBRARY_ID,
+ NETSNMP_DS_LIB_CLIENT_ADDR);
+ if (client_socket) {
+ struct sockaddr_in6 client_addr;
+ netsnmp_sockaddr_in6_2(&client_addr, client_socket, NULL);
+ rc = bind(t->sock, (struct sockaddr *)&client_addr,
+ sizeof(struct sockaddr_in6));
+ if ( rc != 0 ) {
+ DEBUGMSGTL(("netsnmp_udp6", "failed to bind for
clientaddr: %d %s\n",
+ errno, strerror(errno)));
+ netsnmp_socketbase_close(t);
+ netsnmp_transport_free(t);
+ }
+ }
+ /*
* This is a client session. Save the address in the
* transport-specific data pointer for later use by
netsnmp_udp6_send.
*/
-
t->data = malloc(sizeof(netsnmp_indexed_addr_pair));
if (t->data == NULL) {
netsnmp_socketbase_close(t);
I need to confirm the changes, This is required to send snmptrap after
setting clientaddr in snmp.conf.
Please provide your feedback regarding this change.
Thanks,
Rizwan
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