When using snmpbulkwalk to fetch all OIDs from my Aruba Switch,
snmpbulkwalk complains about non-increasing OIDs.
Ignoring using -Cc makes snmpbulkwalk loop forever.
Therefore I'd like to ignore a specific (Sub-)Subtree that cannot be
walked.
This patch adds -Ce cmdline option to snmpbulkwalk, which makes
snmpbulkwalk skip the subtree induced by this OID.
The cmdline option can be used multiple times to skip multiple
sub-trees.
Using this option, I could easly walk all (other) SNMP oids on the
switch. I uses this to identify some mapping between ssh configuration
commands and SNMP related objects.
This patch does not update snmpwalk (I didn't need it). It also does not
update the related man page, as I'm not fluent with editing man pages.
Regards,
M. Braun--- a/apps/snmpbulkwalk.c
+++ b/apps/snmpbulkwalk.c
@@ -72,6 +72,8 @@
oid objid_mib[] = { 1, 3, 6, 1, 2, 1 };
int numprinted = 0;
int reps = 10, non_reps = 0;
+char** excl_oids_str = NULL;
+size_t num_excl_oids = 0;
void
usage(void)
@@ -83,6 +85,8 @@
fprintf(stderr,
" -C APPOPTS\t\tSet various application specific behaviours:\n");
fprintf(stderr,
+"\t\t\t e: skip over excluded block\n");
+fprintf(stderr,
"\t\t\t c: do not check returned OIDs are increasing\n");
fprintf(stderr,
"\t\t\t i: include given OIDs in the search range\n");
@@ -124,6 +128,13 @@
case 'C':
while (*optarg) {
switch (*optarg++) {
+case 'e':
+ num_excl_oids++;
+ excl_oids_str = realloc(excl_oids_str, sizeof(*excl_oids_str) * num_excl_oids);
+ if (!excl_oids_str)
+ exit(1);
+ excl_oids_str[num_excl_oids - 1] = optarg;
+ return;
case 'c':
netsnmp_ds_toggle_boolean(NETSNMP_DS_APPLICATION_ID,
NETSNMP_DS_WALK_DONT_CHECK_LEXICOGRAPHIC);
@@ -187,6 +198,11 @@
int status = STAT_ERROR;
int check;
int exitval = 0;
+int i;
+int excl_oid_idx;
+oid **excl_oids = NULL;
+size_t *excl_oids_len = NULL;
+int width = 100;
netsnmp_ds_register_config(ASN_BOOLEAN, "snmpwalk", "includeRequested",
NETSNMP_DS_APPLICATION_ID,
@@ -233,6 +249,26 @@
rootlen = sizeof(objid_mib) / sizeof(oid);
}
+/*
+ * parse exclude oid strings
+ */
+excl_oids_len = realloc(excl_oids_len, sizeof(*excl_oids_len) * num_excl_oids);
+if (!excl_oids_len && num_excl_oids > 0)
+ exit(1);
+excl_oids = realloc(excl_oids, sizeof(*excl_oids) * num_excl_oids);
+if (!excl_oids && num_excl_oids > 0)
+exit(1);
+for (excl_oid_idx = 0; excl_oid_idx < num_excl_oids; excl_oid_idx++) {
+excl_oids_len[excl_oid_idx] = MAX_OID_LEN;
+excl_oids[excl_oid_idx] = malloc(sizeof(**excl_oids) * MAX_OID_LEN);
+if (!excl_oids[excl_oid_idx])
+ exit(1);
+if (snmp_parse_oid(excl_oids_str[excl_oid_idx], excl_oids[excl_oid_idx], &excl_oids_len[excl_oid_idx]) == NULL) {
+ snmp_perror(excl_oids_str[excl_oid_idx]);
+ exit(1);
+}
+}
+
SOCK_STARTUP;
/*
@@ -264,6 +300,28 @@
}
while (running) {
+excl_oid_idx = -1;
+for(i = 0; i < num_excl_oids; i++) {
+if ((name_length < excl_oids_len[i])
+|| (memcmp(excl_oids[i], name, excl_oids_len[i] * sizeof(oid)) != 0))
+continue; // not in excluded subtree, continue to next exclude rule
+excl_oid_idx = i;
+break;
+}
+if (excl_oid_idx >= 0) {
+/* has been excluded, so skip over */
+memmove(name, excl_oids[excl_oid_idx], excl_oids_len[excl_oid_idx] * sizeof(oid));
+name_length = excl_oids_len[i];
+while (name_length < MAX_OID_LEN) {
+name[name_length] = MAX_SUBID;
+name_length++;
+}
+/* Alternatively: instead of using MAX_SUBID do
+name[name_length-1]++;
+snmp_get_and_print(ss, root, rootlen);
+*/
+}
+
/*
* create PDU for GETBULK request and add object name to request
*/
@@ -292,6 +350,31 @@
running = 0;
continue;
}
+excl_oid_idx = -1;
+for(i = 0; i < num_excl_oids; i++) {
+if ((vars->name_length < excl_oids_len[i])
+|| (memcmp(excl_oids[i], vars->name, excl_oids_len[i] * sizeof(oid))
+!= 0))
+continue; // not in excluded subtree, continue to next exclude rule
+/* has been excluded */
+excl_oid_idx = i;
+break;
+}
+
