[libvirt] [libvirt-snmp][PATCH v3 2/3] Create functions to fill in and send notification packets.
Michal Privoznik
mprivozn at redhat.com
Wed Mar 23 10:06:07 UTC 2011
Before sending snmp notification we need to fill in useful data,
like domain status, UUID, etc.
---
src/Makefile.am | 2 +
src/README.txt | 7 ++-
src/libvirtNotifications.c | 109 ++++++++++++++++++++++++++++++++++++++++++++
src/libvirtNotifications.h | 21 ++++++++
4 files changed, 137 insertions(+), 2 deletions(-)
create mode 100644 src/libvirtNotifications.c
create mode 100644 src/libvirtNotifications.h
diff --git a/src/Makefile.am b/src/Makefile.am
index c781e230e6b5f87c6776f40360d580ff0b50fc2b..d68f17499d8768706050a7f38f77fc597fb0db46 100644
--- a/src/Makefile.am
+++ b/src/Makefile.am
@@ -15,12 +15,14 @@ USER_SRCS = \
libvirtGuestTable_data_get.c \
libvirtGuestTable_data_set.c \
libvirtGuestTable_data_access.c \
+ libvirtNotifications.c \
libvirtSnmp.c
USER_HDRS = \
libvirtGuestTable_data_get.h \
libvirtGuestTable_data_set.h \
libvirtGuestTable_data_access.h \
+ libvirtNotifications.h \
libvirtSnmp.h
SRCS = \
diff --git a/src/README.txt b/src/README.txt
index 22dd2af8436de1797afcee37f47218fe46dac4fd..6d010f6d0fedfa6e47333468bfa9dec40e47d29c 100644
--- a/src/README.txt
+++ b/src/README.txt
@@ -31,8 +31,11 @@ libvirtGuestTable*
- Generated by this command: 'MIBDIRS="+." MIBS="+LIBVIRT-MIB" mib2c libvirtMIB'.
- It asks few questions and produces the mentioned files.
- libvirtGuestTable.h, libvirtGuestTable.c, libvirtGuestTable_data_access.c, libvirtGuestTable_data_get.c and libvirtGuestTable_data_set.c are manually edited to set correct data structures and their handling. It's nicely documented, see libvirtGuestTable-README-FIRST.txt and libvirtGuestTable-README-libvirtGuestTable.txt + TODOs in the code. It took me ~2 hours to update these files (but I've done this several times for different MIBs, so I know what to do :). Do not touch the rest of the files!
-- I've done everything necessary for simple read-write access.
-- This code must be regenerated when the definition of libvirtGuestTable in the MIB file is changed! There is some automatic merging tool, which merges my changes with newly generated code, but I wouldn't rely on it.
+
+libvirtNotifications.[c|h]
+- The SNMP trap (notification) stuff
+- Generated by this command: 'MIBDIRS="+." MIBS="+LIBVIRT-MIB" mib2c -c mib2c.notify.conf libvirtNotifications'
+- and slightly modified (especially filling up trap variables which are going to be send).
Usage (tested on Fedora 14 and RHEL6)
diff --git a/src/libvirtNotifications.c b/src/libvirtNotifications.c
new file mode 100644
index 0000000000000000000000000000000000000000..0001425b0c1c338bca01d958320ee2379d792866
--- /dev/null
+++ b/src/libvirtNotifications.c
@@ -0,0 +1,109 @@
+/*
+ * libvirtNotifications.c: Fill in trap packets
+ *
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * See COPYING for the license of this software
+ *
+ * Michal Privoznik <mprivozn at redhat.com>
+ */
+
+#include <net-snmp/net-snmp-config.h>
+#include <net-snmp/net-snmp-includes.h>
+#include <net-snmp/agent/net-snmp-agent-includes.h>
+#include <string.h>
+#include "libvirtNotifications.h"
+#include "libvirtGuestTable_enums.h"
+
+static const oid snmptrap_oid[] = { 1, 3, 6, 1, 6, 3, 1, 1, 4, 1, 0 };
+
+int
+send_libvirtGuestNotif_trap(virDomainPtr dom)
+{
+ netsnmp_variable_list *var_list = NULL;
+ const oid libvirtGuestNotif_oid[] = { 1, 3, 6, 1, 4, 1, 12345, 0, 1 };
+ const oid libvirtGuestName_oid[] =
+ { 1, 3, 6, 1, 4, 1, 12345, 1, 1, 1, 2, 0 };
+ const oid libvirtGuestUUID_oid[] =
+ { 1, 3, 6, 1, 4, 1, 12345, 1, 1, 1, 1, 1 };
+ const oid libvirtGuestState_oid[] =
+ { 1, 3, 6, 1, 4, 1, 12345, 1, 1, 1, 3, 2 };
+ const oid libvirtGuestRowStatus_oid[] =
+ { 1, 3, 6, 1, 4, 1, 12345, 1, 1, 1, 9, 3 };
+
+
+ const char *domName = virDomainGetName(dom);
+ char domUUID[VIR_UUID_BUFLEN];
+ virDomainInfo info;
+ int rowstatus = ROWSTATUS_ACTIVE;
+
+ if (virDomainGetUUID(dom, domUUID)) {
+ fprintf(stderr, "Failed to get domain UUID\n");
+ return SNMP_ERR_GENERR;
+ }
+
+ if (virDomainGetInfo(dom, &info)) {
+ fprintf(stderr, "Failed to get domain info\n");
+ return SNMP_ERR_GENERR;
+ }
+
+ /*
+ * If domain is shutting down, row in libvirtGuestTable will
+ * not be accessible anymore.
+ */
+ switch (info.state) {
+ case VIR_DOMAIN_SHUTDOWN:
+ case VIR_DOMAIN_SHUTOFF:
+ case VIR_DOMAIN_CRASHED:
+ rowstatus = ROWSTATUS_NOTINSERVICE;
+ break;
+
+ default:
+ rowstatus = ROWSTATUS_ACTIVE;
+ break;
+ };
+
+ /*
+ * Set the snmpTrapOid.0 value
+ */
+ snmp_varlist_add_variable(&var_list,
+ snmptrap_oid, OID_LENGTH(snmptrap_oid),
+ ASN_OBJECT_ID,
+ libvirtGuestNotif_oid,
+ sizeof(libvirtGuestNotif_oid));
+
+ /*
+ * Add any objects from the trap definition
+ */
+ snmp_varlist_add_variable(&var_list,
+ libvirtGuestName_oid,
+ OID_LENGTH(libvirtGuestName_oid),
+ ASN_OCTET_STR, domName, strlen(domName));
+ snmp_varlist_add_variable(&var_list,
+ libvirtGuestUUID_oid,
+ OID_LENGTH(libvirtGuestUUID_oid),
+ ASN_OCTET_STR, domUUID, sizeof(domUUID));
+ snmp_varlist_add_variable(&var_list,
+ libvirtGuestState_oid,
+ OID_LENGTH(libvirtGuestState_oid),
+ ASN_INTEGER,
+ (u_char *) & info.state, sizeof(info.state));
+ snmp_varlist_add_variable(&var_list,
+ libvirtGuestRowStatus_oid,
+ OID_LENGTH(libvirtGuestRowStatus_oid),
+ ASN_INTEGER,
+ (u_char *) & rowstatus, sizeof(rowstatus));
+
+ /*
+ * Add any extra (optional) objects here
+ */
+
+ /*
+ * Send the trap to the list of configured destinations
+ * and clean up
+ */
+ send_v2trap(var_list);
+ snmp_free_varbind(var_list);
+
+ return SNMP_ERR_NOERROR;
+}
diff --git a/src/libvirtNotifications.h b/src/libvirtNotifications.h
new file mode 100644
index 0000000000000000000000000000000000000000..84eefc32359320d9a3cb501a7941241731246dc2
--- /dev/null
+++ b/src/libvirtNotifications.h
@@ -0,0 +1,21 @@
+/*
+ * libvirtNotifications.h: Fill in trap packets
+ *
+ * Copyright (C) 2011 Red Hat, Inc.
+ *
+ * See COPYING for the license of this software
+ *
+ * Michal Privoznik <mprivozn at redhat.com>
+ */
+
+#ifndef LIBVIRTNOTIFICATIONS_H
+#define LIBVIRTNOTIFICATIONS_H
+
+#include "libvirtSnmp.h"
+
+/*
+ * function declarations
+ */
+int send_libvirtGuestNotif_trap(virDomainPtr dom);
+
+#endif /* LIBVIRTNOTIFICATIONS_H */
--
1.7.4
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