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check_interfaces.c
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check_interfaces.c
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// This one is needed on FreeBSD and it has to be before the others or at least some of them
#include <getopt.h>
#include "snmp_bulkget.h"
#include "utils.h"
#include <net-snmp/net-snmp-config.h>
#include <stdbool.h>
#include <sys/time.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netdb.h>
/*
* text strings to output in the perfdata
*/
char *if_vars_default[] = {"inOctets", "outOctets", "inDiscards", "outDiscards", "inErrors", "outErrors",
"inUcast", "outUcast", "speed", "inBitps", "outBitps"};
char *if_vars_cisco[] = {"inOctets", "outOctets", "inDiscards", "outDiscards", "inCRCs", "outCollisions",
"inUcast", "outUcast", "speed", "inBitps", "outBitps"};
/*
* OIDs, hardcoded to remove the dependency on MIBs
*/
char *oid_if_bulkget[] = {".1.3.6.1.2.1.1.3", ".1.3.6.1.2.1.2.1", ".1.3.6.1.2.1.2.2.1.2", 0}; /* "uptime", "ifNumber", "ifDescr" */
char *oid_if_get[] = {".1.3.6.1.2.1.1.3.0", ".1.3.6.1.2.1.2.1.0", ".1.3.6.1.2.1.2.2.1.2.1", 0}; /* "uptime", "ifNumber", "ifDescr" */
char *oid_if_bintec[] = {".1.3.6.1.2.1.1.3.0", ".1.3.6.1.2.1.2.1.0", ".1.3.6.1.2.1.2.2.1.2.0", 0}; /* "uptime", "ifNumber", "ifDescr" */
char *oid_extended[] = {".1.3.6.1.2.1.31.1.1.1.6", /* ifHCInOctets */
".1.3.6.1.2.1.31.1.1.1.10", /* ifHCOutOctets */
".1.3.6.1.2.1.2.2.1.11", /* ifInUcastPkts */
".1.3.6.1.2.1.2.2.1.17", /* ifOutUcastPkts */
".1.3.6.1.2.1.2.2.1.5", /* ifSpeed */
".1.3.6.1.2.1.31.1.1.1.15", /* ifHighSpeed */
".1.3.6.1.2.1.31.1.1.1.18", /* alias */
".1.3.6.1.2.1.31.1.1.1.1", /* name */
0};
char *oid_alias_bulkget[] = {".1.3.6.1.2.1.31.1.1.1.18", 0}; /* "alias" */
char *oid_alias_get[] = {".1.3.6.1.2.1.31.1.1.1.18.1", 0}; /* "alias" */
char *oid_alias_bintec[] = {".1.3.6.1.2.1.31.1.1.1.18.0", 0}; /* "alias" */
char *oid_names_bulkget[] = {".1.3.6.1.2.1.31.1.1.1.1", 0}; /* "name" */
char *oid_names_get[] = {".1.3.6.1.2.1.31.1.1.1.1.1", 0}; /* "name" */
char *oid_names_bintec[] = {".1.3.6.1.2.1.31.1.1.1.1.0", 0}; /* "name - NOT TESTED!" */
char *oid_extended_cisco[] = {".1.3.6.1.4.1.9.5.1.4.1.1.23", /* portAdditionalOperStatus */
0};
char *oid_vals_default[] = {".1.3.6.1.2.1.2.2.1.7", /* ifAdminStatus */
".1.3.6.1.2.1.2.2.1.8", /* ifOperStatus */
".1.3.6.1.2.1.2.2.1.10", /* ifInOctets */
".1.3.6.1.2.1.2.2.1.13", /* ifInDiscards */
".1.3.6.1.2.1.2.2.1.14", /* ifInErrors */
".1.3.6.1.2.1.2.2.1.16", /* ifOutOctets */
".1.3.6.1.2.1.2.2.1.19", /* ifOutDiscards */
".1.3.6.1.2.1.2.2.1.20", /* ifOutErrors */
0};
char *oid_vals_cisco[] = {".1.3.6.1.2.1.2.2.1.7", /* ifAdminStatus */
".1.3.6.1.2.1.2.2.1.8", /* ifOperStatus */
".1.3.6.1.2.1.2.2.1.10", /* ifInOctets */
".1.3.6.1.2.1.2.2.1.13", /* ifInDiscards */
".1.3.6.1.4.1.9.2.2.1.1.12", /* locIfInCRC */
".1.3.6.1.2.1.2.2.1.16", /* ifOutOctets */
".1.3.6.1.2.1.2.2.1.19", /* ifOutDiscards */
".1.3.6.1.4.1.9.2.2.1.1.25", /* locIfCollisions */
0};
#define DEFAULT_COMMUNITY "public"
/*
* operating modes
*/
const char *modes[] = {"default", "cisco", "nonbulk", "bintec", NULL};
#ifdef DEBUG
static char *implode_result;
#endif
enum returncode {
OK = 0,
WARNING = 1,
CRITICAL = 2,
UNKNOWN = 3
};
typedef enum returncode returncode_t;
// Forward declarations
void parse_and_check_commandline(int argc, char **argv, struct configuration_struct *config);
bool fetch_interface_aliases(struct configuration_struct * /*config*/, char ** /*oid_aliasp*/, netsnmp_session *snmp_session,
netsnmp_session *session, struct ifStruct *interfaces, int ifNumber);
bool fetch_interface_names(struct configuration_struct * /*config*/, char **oid_namesp, netsnmp_session *snmp_session,
netsnmp_session *session, struct ifStruct *interfaces, int ifNumber);
returncode_t print_output(struct configuration_struct *config, struct ifStruct *oldperfdata, long double starttime,
struct ifStruct *interfaces, String *out, char **if_vars, unsigned int number_of_matched_interfaces,
struct timeval *time_value, int uptime, int ifNumber);
void print_version(void);
int main(int argc, char *argv[]) {
netsnmp_session session;
netsnmp_session *snmp_session;
netsnmp_pdu *pdu;
netsnmp_pdu *response;
netsnmp_variable_list *vars;
int status;
int status2;
int count = 0; /* used for: the number of interfaces we receive, the number
of regex matches */
size_t size;
/* uptime counter */
unsigned int uptime = 0;
int ifNumber = 0;
config_t config = {
.crit_on_down_flag = true,
.get_aliases_flag = false,
.match_aliases_flag = false,
.get_names_flag = false,
.print_all_flag = false,
.community = DEFAULT_COMMUNITY,
.bandwith = 0,
.oldperfdatap = 0,
.err_tolerance = 50,
.coll_tolerance = -1,
.hostname = 0,
.port = "161",
.user = 0,
.auth_proto = 0,
.auth_pass = 0,
.priv_proto = 0,
.priv_pass = 0,
.trimdescr = 0,
.prefix = 0,
.iface_regex = 0,
.global_timeout = DFLT_TIMEOUT,
.exclude_list = 0,
.speed = 0,
.lastcheck = 0,
.sleep_usecs = 0,
.session_retries = 2,
.pdu_max_repetitions = 4096L,
.mode = DEFAULT,
};
struct ifStruct *interfaces = NULL; /* current interface data */
struct ifStruct *oldperfdata = NULL; /* previous check interface data */
struct OIDStruct *OIDp;
long double starttime;
int ignore_count = 0;
char outstr[MAX_STRING];
memset(outstr, 0, sizeof(outstr));
String out;
out.max = MAX_STRING;
out.len = 0;
out.text = outstr;
struct OIDStruct lastOid;
static char **oid_ifp;
static char **oid_vals;
static char **if_vars;
static char **oid_aliasp;
static char **oid_namesp;
oid_ifp = oid_if_bulkget;
oid_vals = oid_vals_default;
if_vars = if_vars_default;
parse_and_check_commandline(argc, argv, &config);
struct timeval time_value;
struct timezone time_zone;
gettimeofday(&time_value, &time_zone);
starttime = (long double)time_value.tv_sec + (((long double)time_value.tv_usec) / 1000000);
// +1 for the `:` between hostname and port
size_t peername_max_len = strlen(config.hostname) + strlen(config.port) + 1;
char *peername = calloc(1, peername_max_len + 1);
if (peername == NULL) {
printf("Failed to allocate memory at %d in %s\n", __LINE__, __FUNCTION__);
exit(3);
}
strlcpy(peername, config.hostname, peername_max_len + 1);
strlcat(peername, ":", peername_max_len + 1);
strlcat(peername, config.port, peername_max_len + 1);
#ifdef DEBUG
benchmark_start("Start SNMP session");
#endif
if (config.user) {
/* use snmpv3 */
snmp_session = start_session_v3(&session, config.user, config.auth_proto, config.auth_pass, config.priv_proto, config.priv_pass,
peername, config.global_timeout, config.session_retries);
} else {
snmp_session = start_session(&session, config.community, peername, config.mode, config.global_timeout, config.session_retries);
}
#ifdef DEBUG
benchmark_end();
#endif
if (config.mode == NONBULK) {
oid_ifp = oid_if_get;
size = (sizeof(oid_if_get) / sizeof(char *)) - 1;
oid_aliasp = oid_alias_get;
oid_namesp = oid_names_get;
} else if (config.mode == BINTEC) {
oid_ifp = oid_if_bintec;
size = (sizeof(oid_if_bintec) / sizeof(char *)) - 1;
oid_aliasp = oid_alias_bintec;
oid_namesp = oid_names_bintec;
} else {
oid_ifp = oid_if_bulkget;
size = (sizeof(oid_if_bulkget) / sizeof(char *)) - 1;
oid_aliasp = oid_alias_bulkget;
oid_namesp = oid_names_bulkget;
}
/* allocate the space for the interface OIDs */
OIDp = (struct OIDStruct *)calloc(size, sizeof(struct OIDStruct));
if (config.mode == CISCO) {
if_vars = if_vars_cisco;
oid_vals = oid_vals_cisco;
}
/* get the number of interfaces, and their index numbers
*
* We will attempt to get all the interfaces in a single packet
* - which should manage about 64 interfaces.
* If the end interface has not been reached, we fetch more packets - this
* is necessary to work around buggy switches that lie about the ifNumber
*/
for (bool lastifflag = false; lastifflag != true;) {
/* build our request depending on the mode */
if (count == 0) {
create_pdu(config.mode, oid_ifp, &pdu, &OIDp, 2, config.pdu_max_repetitions);
} else {
/* we have not received all interfaces in the preceding packet, so
* fetch the next lot */
if (config.mode == BINTEC || config.mode == NONBULK) {
pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
} else {
pdu = snmp_pdu_create(SNMP_MSG_GETBULK);
pdu->non_repeaters = 0;
pdu->max_repetitions = config.pdu_max_repetitions;
}
snmp_add_null_var(pdu, lastOid.name, lastOid.name_len);
}
#ifdef DEBUG
implode_result = implode(", ", oid_ifp + count);
benchmark_start("Send SNMP request for OIDs: %s", implode_result);
#endif
/* send the request */
status = snmp_synch_response(snmp_session, pdu, &response);
#ifdef DEBUG
benchmark_end();
free(implode_result);
#endif
if (config.sleep_usecs) {
usleep(config.sleep_usecs);
}
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
vars = response->variables;
if (count == 0) {
/* assuming that the uptime and ifNumber come first */
/* on some devices the ifNumber is not available... */
while (!ifNumber) {
if (!(memcmp(OIDp[0].name, vars->name, OIDp[0].name_len * sizeof(oid)))) {
/* uptime */
if (vars->type == ASN_TIMETICKS) {
/* uptime is in 10ms units -> convert to seconds */
uptime = *(vars->val.integer) / 100;
}
} else if (!memcmp(OIDp[1].name, vars->name, OIDp[1].name_len * sizeof(oid))) {
/* we received a valid IfNumber */
ifNumber = *(vars->val.integer);
if (ifNumber == 0) {
/* there are no interfaces! Stop here */
printf("No interfaces found");
exit(0);
}
} else {
addstr(&out, "(no IfNumber parameter, assuming 32 interfaces) ");
ifNumber = 32;
}
vars = vars->next_variable;
}
// get the real list length we need
int real_count = 0;
for (netsnmp_variable_list *runner = response->variables; runner; runner = runner->next_variable) {
if (vars->type == ASN_OCTET_STR) {
real_count++;
}
}
if (real_count > ifNumber) {
ifNumber = real_count;
}
interfaces = (struct ifStruct *)calloc((size_t)ifNumber, sizeof(struct ifStruct));
oldperfdata = (struct ifStruct *)calloc((size_t)ifNumber, sizeof(struct ifStruct));
#ifdef DEBUG
fprintf(stderr, "got %d interfaces\n", ifNumber);
#endif
} else {
/* subsequent replies have no ifNumber */
}
for (; vars; vars = vars->next_variable) {
/*
* if the next OID is shorter
* or if the next OID doesn't begin with our base OID
* then we have reached the end of the table :-)
* print_variable(vars->name, vars->name_length, vars);
*/
/* save the OID in case we need additional packets */
memcpy(lastOid.name, vars->name, (vars->name_length * sizeof(oid)));
lastOid.name_len = vars->name_length;
if ((vars->name_length < OIDp[2].name_len) || (memcmp(OIDp[2].name, vars->name, (vars->name_length - 1) * sizeof(oid)))) {
#ifdef DEBUG
fprintf(stderr, "reached end of interfaces\n");
#endif
lastifflag = true;
break;
}
/* now we fill our interfaces array with the index number and
* the description that we have received
*/
if (vars->type == ASN_OCTET_STR) {
if (config.trimdescr && config.trimdescr < vars->val_len) {
interfaces[count].index = vars->name[(vars->name_length - 1)];
MEMCPY(interfaces[count].descr, (vars->val.string) + config.trimdescr, vars->val_len - config.trimdescr);
TERMSTR(interfaces[count].descr, vars->val_len - config.trimdescr);
} else {
interfaces[count].index = vars->name[(vars->name_length - 1)];
MEMCPY(interfaces[count].descr, vars->val.string, vars->val_len);
TERMSTR(interfaces[count].descr, vars->val_len);
}
count++;
}
}
if (count < ifNumber) {
if (lastifflag) {
#ifdef DEBUG
fprintf(stderr, "Device says it has %d but really has %d interfaces\n", ifNumber, count);
#endif
ifNumber = count;
} else {
#ifdef DEBUG
fprintf(stderr, "Sending another packet\n");
#endif
}
} else {
lastifflag = true;
if (count > ifNumber) {
#ifdef DEBUG
fprintf(stderr, "Device says it has %d but really has %d interfaces\n", ifNumber, count);
#endif
ifNumber = count;
}
#ifdef DEBUG
fprintf(stderr, "%d interfaces found\n", ifNumber);
#endif
}
} else {
/*
* FAILURE: print what went wrong!
*/
if (status == STAT_SUCCESS) {
printf("Error in packet\nReason: %s\n", snmp_errstring(response->errstat));
} else if (status == STAT_TIMEOUT) {
printf("Timeout while reading interface descriptions from %s\n", session.peername);
exit(EXITCODE_TIMEOUT);
} else if (status == STAT_ERROR && snmp_session->s_snmp_errno == SNMPERR_TIMEOUT) {
printf("Timeout\n");
exit(EXITCODE_TIMEOUT);
} else {
snmp_sess_perror("snmp_bulkget", snmp_session);
}
exit(2);
}
/*
* Clean up:
* free the response.
*/
if (response) {
snmp_free_pdu(response);
response = 0;
}
}
if (OIDp) {
free(OIDp);
OIDp = 0;
}
/* we should have all interface descriptions in our array */
/* If we want to match the regex with the aliases, we have to get them now.
* this allows us later to only request the interface counters of the
* desired interfaces.
*/
if (config.match_aliases_flag && config.iface_regex) {
fetch_interface_aliases(&config, oid_aliasp, snmp_session, &session, interfaces, ifNumber);
}
/* If the get_names_flag is set, we also have to get the interface names so
* we can match the regex with them */
/* TODO: This is just a slightly changed copy from above. I think it could
* be solved better (i.e. by putting it into a function) but it works this
* way
* :-) */
if (config.get_names_flag && config.iface_regex) {
fetch_interface_names(&config, oid_namesp, snmp_session, &session, interfaces, ifNumber);
}
if (config.iface_regex) {
/*
* a regex was given so we will go through our array
* and try and match it with what we received
*
* count is the number of matches
*/
count = 0;
for (int i = 0; i < ifNumber; i++) {
/* When --if-name is set ignore descr in favor of name, else use old
* behaviour */
if (config.get_names_flag) {
status = !regexec(&config.re, interfaces[i].name, (size_t)0, NULL, 0) ||
(config.match_aliases_flag && !(regexec(&config.re, interfaces[i].alias, (size_t)0, NULL, 0)));
} else {
status = !regexec(&config.re, interfaces[i].descr, (size_t)0, NULL, 0) ||
(config.match_aliases_flag && !(regexec(&config.re, interfaces[i].alias, (size_t)0, NULL, 0)));
}
status2 = 0;
if (status && config.exclude_list) {
if (config.get_names_flag) {
status2 = !regexec(&config.exclude_re, interfaces[i].name, (size_t)0, NULL, 0) ||
(config.match_aliases_flag && !(regexec(&config.re, interfaces[i].alias, (size_t)0, NULL, 0)));
} else {
status2 = !regexec(&config.exclude_re, interfaces[i].descr, (size_t)0, NULL, 0) ||
(config.match_aliases_flag && !(regexec(&config.exclude_re, interfaces[i].alias, (size_t)0, NULL, 0)));
}
}
if (status && !status2) {
count++;
#ifdef DEBUG
fprintf(stderr, "Interface %d (%s) matched\n", interfaces[i].index, interfaces[i].descr);
#endif
} else {
interfaces[i].ignore = 1;
}
}
regfree(&config.re);
if (config.exclude_list) {
regfree(&config.exclude_re);
}
if (count) {
#ifdef DEBUG
fprintf(stderr, "- %d interface%s found\n", count, (count == 1) ? "" : "s");
#endif
} else {
printf("- no interfaces matched regex");
exit(0);
}
}
/* now retrieve the interface values in 2 GET requests
* N.B. if the interfaces are continuous we could try
* a bulk get instead
*/
for (int j = 0, k = 0; j < ifNumber; j++) {
/* add the interface to the oldperfdata list */
strcpy_nospaces(oldperfdata[j].descr, interfaces[j].descr);
if (!interfaces[j].ignore) {
/* fetch the standard values first */
if (create_request(snmp_session, &OIDp, oid_vals, interfaces[j].index, &response, config.sleep_usecs)) {
for (vars = response->variables; vars; vars = vars->next_variable) {
k = -1;
/* compare the received value to the requested value */
for (int i = 0; oid_vals[i]; i++) {
if (!memcmp(OIDp[i].name, vars->name, OIDp[i].name_len * sizeof(oid))) {
k = i;
break;
}
}
switch (k) /* the offset into oid_vals */
{
case 0: /* ifAdminStatus */
if (vars->type == ASN_INTEGER && *(vars->val.integer) == 2) {
/* ignore interfaces that are administratively down
*/
interfaces[j].admin_down = 1;
ignore_count++;
}
break;
case 1: /*ifOperStatus */
if (vars->type == ASN_INTEGER) {
/* 1 is up(OK), 3 is testing (assume OK), 5 is
* dormant(assume OK)
*/
interfaces[j].status =
(*(vars->val.integer) == 1 || *(vars->val.integer) == 5 || *(vars->val.integer) == 3) ? 1 : 0;
}
break;
case 2: /* ifInOctets */
if (vars->type == ASN_COUNTER) {
interfaces[j].inOctets = *(vars->val.integer);
}
break;
case 3: /* ifInDiscards */
if (vars->type == ASN_COUNTER) {
interfaces[j].inDiscards = *(vars->val.integer);
}
break;
case 4: /* ifInErrors or locIfInCRC */
if (vars->type == ASN_COUNTER || vars->type == ASN_INTEGER) {
interfaces[j].inErrors = *(vars->val.integer);
}
break;
case 5: /* ifOutOctets */
if (vars->type == ASN_COUNTER) {
interfaces[j].outOctets = *(vars->val.integer);
}
break;
case 6: /* ifOutDiscards */
if (vars->type == ASN_COUNTER) {
interfaces[j].outDiscards = *(vars->val.integer);
}
break;
case 7: /* ifOutErrors or locIfCollisions */
if (vars->type == ASN_COUNTER || vars->type == ASN_INTEGER) {
interfaces[j].outErrors = *(vars->val.integer);
}
break;
}
}
if (response) {
snmp_free_pdu(response);
response = 0;
}
}
/* now fetch the extended oids (64 bit counters etc.) */
if (create_request(snmp_session, &OIDp, oid_extended, interfaces[j].index, &response, config.sleep_usecs)) {
for (vars = response->variables; vars; vars = vars->next_variable) {
k = -1;
/* compare the received value to the requested value */
for (int i = 0; oid_extended[i]; i++) {
if (!memcmp(OIDp[i].name, vars->name, OIDp[i].name_len * sizeof(oid))) {
k = i;
break;
}
}
switch (k) /* the offset into oid_extended */
{
case 0: /* ifHCInOctets */
if (vars->type == ASN_COUNTER64) {
interfaces[j].inOctets = convertto64((vars->val.counter64), 0);
}
break;
case 1: /* ifHCOutOctets */
if (vars->type == ASN_COUNTER64) {
interfaces[j].outOctets = convertto64((vars->val.counter64), 0);
}
break;
case 2: /* ifInUcastPkts */
if (vars->type == ASN_COUNTER) {
interfaces[j].inUcast = *(vars->val.integer);
}
break;
case 3: /* ifOutUcastPkts */
if (vars->type == ASN_COUNTER) {
interfaces[j].outUcast = *(vars->val.integer);
}
break;
case 4: /* ifSpeed */
/* don't overwrite a high-speed value */
if (vars->type == ASN_GAUGE && !(interfaces[j].speed)) {
interfaces[j].speed = *(vars->val.integer);
}
break;
case 5: /* ifHighSpeed */
if (vars->type == ASN_GAUGE) {
/* convert to bits / sec */
interfaces[j].speed = ((u64) * (vars->val.integer)) * 1000000ULL;
}
break;
case 6: /* alias */
if (vars->type == ASN_OCTET_STR) {
MEMCPY(interfaces[j].alias, vars->val.string, vars->val_len);
}
break;
case 7: /* name */
if (vars->type == ASN_OCTET_STR) {
MEMCPY(interfaces[j].name, vars->val.string, vars->val_len);
}
break;
}
}
if (response) {
snmp_free_pdu(response);
response = 0;
}
}
/* now fetch the Cisco-specific extended oids */
if (config.mode == CISCO &&
create_request(snmp_session, &OIDp, oid_extended_cisco, interfaces[j].index, &response, config.sleep_usecs)) {
for (vars = response->variables; vars; vars = vars->next_variable) {
k = -1;
/* compare the received value to the requested value */
for (int i = 0; oid_extended_cisco[i]; i++) {
if (!memcmp(OIDp[i].name, vars->name, OIDp[i].name_len * sizeof(oid))) {
k = i;
break;
}
}
switch (k) /* the offset into oid_extended_cisco */
{
case 0: /* portAdditionalOperStatus */
if (vars->type == ASN_OCTET_STR) {
interfaces[j].err_disable = !!(vars->val.string[1] & (unsigned char)32U);
}
break;
}
}
if (response) {
snmp_free_pdu(response);
response = 0;
}
}
}
}
/* let the user know about interfaces that are down (and subsequently
* ignored)
*/
if (ignore_count) {
addstr(&out, " - %d %s administratively down", ignore_count, ignore_count != 1 ? "are" : "is");
}
if (OIDp) {
free(OIDp);
OIDp = 0;
}
/* calculate time taken, print perfdata */
gettimeofday(&time_value, &time_zone);
returncode_t exit_code = print_output(&config, oldperfdata, starttime, interfaces, &out, if_vars, count, &time_value, uptime, ifNumber);
#ifdef DEBUG
benchmark_start("Close SNMP session");
#endif
snmp_close(snmp_session);
snmp_close(&session);
#ifdef DEBUG
benchmark_end();
#endif
SOCK_CLEANUP;
exit(exit_code);
}
returncode_t print_output(struct configuration_struct *config, struct ifStruct *oldperfdata, long double starttime,
struct ifStruct *interfaces, String *out, char **if_vars, unsigned int number_of_matched_interfaces,
struct timeval *time_value, int uptime, int ifNumber) {
unsigned int parsed_lastcheck = 0;
if (config->oldperfdatap && config->oldperfdatap[0]) {
parse_perfdata(config->oldperfdatap, oldperfdata, config->prefix, &parsed_lastcheck, ifNumber, if_vars);
}
if (config->lastcheck) {
config->lastcheck = (starttime - config->lastcheck);
} else if (parsed_lastcheck) {
config->lastcheck = (starttime - parsed_lastcheck);
}
/* do not use old perfdata if the device has been reset recently
* Note that a switch will typically rollover the uptime counter every 497
* days which is infrequent enough to not bother about :-)
* UPTIME_TOLERANCE_IN_SECS doesn't need to be a big number
*/
if ((config->lastcheck + UPTIME_TOLERANCE_IN_SECS) > uptime) {
config->lastcheck = 0;
}
char perfstr[MAX_STRING];
memset(perfstr, 0, sizeof(perfstr));
String perf;
perf.max = MAX_STRING;
perf.len = 0;
perf.text = perfstr;
bool errorflag = false;
bool warnflag = false;
for (int i = 0; i < ifNumber; i++) {
double inload = 0;
double outload = 0;
if (!interfaces[i].ignore) {
int warn = 0;
char *nameOrDescr = config->get_names_flag && strlen(interfaces[i].name) ? interfaces[i].name : interfaces[i].descr;
if ((!interfaces[i].status || interfaces[i].err_disable) && !interfaces[i].ignore && !interfaces[i].admin_down) {
if (config->crit_on_down_flag) {
addstr(&perf, "[CRITICAL] ");
errorflag = true;
/* show the alias if configured */
if (config->get_names_flag && strlen(interfaces[i].name)) {
addstr(out, ", %s", interfaces[i].name);
addstr(&perf, "%s", interfaces[i].name);
} else {
addstr(out, ", %s", interfaces[i].descr);
addstr(&perf, "%s", interfaces[i].descr);
}
if (!interfaces[i].admin_down) {
if (config->get_aliases_flag && strlen(interfaces[i].alias)) {
addstr(out, " (%s) down", interfaces[i].alias);
addstr(&perf, " (%s) down", interfaces[i].alias);
} else {
addstr(out, " down");
addstr(&perf, " down");
}
if (interfaces[i].err_disable) {
addstr(out, " (errdisable)");
addstr(&perf, " (errdisable)");
}
}
} else {
addstr(&perf, "[OK] ");
if (config->get_names_flag && strlen(interfaces[i].name)) {
addstr(&perf, "%s", interfaces[i].name);
} else {
addstr(&perf, "%s", interfaces[i].descr);
}
if (config->get_aliases_flag && strlen(interfaces[i].alias)) {
addstr(&perf, " (%s) down", interfaces[i].alias);
} else {
addstr(&perf, " down");
}
}
} else if (interfaces[i].admin_down && config->print_all_flag) {
addstr(&perf, "[OK] %s", (config->get_names_flag && strlen(interfaces[i].name)) ? interfaces[i].name : interfaces[i].descr);
if (config->get_aliases_flag && strlen(interfaces[i].alias)) {
addstr(&perf, " (%s) is down (administrative down)", interfaces[i].alias);
} else {
addstr(&perf, " is down (administrative down)");
}
}
/* check if errors on the interface are increasing faster than our
defined value */
else if ((oldperfdata[i].inErrors || oldperfdata[i].outErrors) &&
(interfaces[i].inErrors > (oldperfdata[i].inErrors + (unsigned long)config->err_tolerance) ||
interfaces[i].outErrors > (oldperfdata[i].outErrors + (unsigned long)config->coll_tolerance))) {
if (config->oldperfdatap && !interfaces[i].ignore) {
if (config->get_names_flag && strlen(interfaces[i].name)) {
addstr(&perf, "[WARNING] %s", interfaces[i].name);
} else {
addstr(&perf, "[WARNING] %s", interfaces[i].descr);
}
if (config->get_aliases_flag && strlen(interfaces[i].alias)) {
addstr(&perf, " (%s) has", interfaces[i].alias);
} else {
addstr(&perf, " has");
}
/* if we are not in cisco mode simply use "errors" */
if (config->mode != CISCO) {
addstr(&perf, " errors\n");
} else {
if (interfaces[i].inErrors > (oldperfdata[i].inErrors + (unsigned long)config->err_tolerance)) {
addstr(&perf, " %lu CRC errors since last check\n", interfaces[i].inErrors - oldperfdata[i].inErrors);
}
if (interfaces[i].outErrors > (oldperfdata[i].outErrors + (unsigned long)config->coll_tolerance)) {
addstr(&perf, " %lu collisions since last check\n", interfaces[i].outErrors - oldperfdata[i].outErrors);
}
}
if (config->get_names_flag && strlen(interfaces[i].name)) {
addstr(out, ", %s has %lu errors", interfaces[i].name,
(interfaces[i].inErrors + interfaces[i].outErrors - oldperfdata[i].inErrors - oldperfdata[i].outErrors));
} else {
addstr(out, ", %s has %lu errors", interfaces[i].descr,
(interfaces[i].inErrors + interfaces[i].outErrors - oldperfdata[i].inErrors - oldperfdata[i].outErrors));
}
warnflag = true;
// warn++; /* if you uncomment this you will get 2 rows with
// [warning]
// */
}
}
if (config->lastcheck && (interfaces[i].speed || config->speed) && !interfaces[i].admin_down &&
(oldperfdata[i].inOctets || oldperfdata[i].outOctets)) {
interfaces[i].inbitps =
(subtract64(interfaces[i].inOctets, oldperfdata[i].inOctets, config->lastcheck, uptime) / (u64)config->lastcheck) *
8ULL;
interfaces[i].outbitps =
(subtract64(interfaces[i].outOctets, oldperfdata[i].outOctets, config->lastcheck, uptime) / (u64)config->lastcheck) *
8ULL;
if (config->speed) {
inload = (long double)interfaces[i].inbitps / ((long double)config->speed / 100L);
outload = (long double)interfaces[i].outbitps / ((long double)config->speed / 100L);
} else {
/* use the interface speed if a speed is not given */
inload = (long double)interfaces[i].inbitps / ((long double)interfaces[i].speed / 100L);
outload = (long double)interfaces[i].outbitps / ((long double)interfaces[i].speed / 100L);
}
if ((config->bandwith > 0) && ((int)inload > config->bandwith || (int)outload > config->bandwith)) {
warn++;
warnflag = true;
}
}
if (interfaces[i].status && !interfaces[i].ignore) {
if (!(warn)) {
addstr(&perf, "[OK]");
} else {
addstr(&perf, "[WARNING]");
}
addstr(&perf, " %s", nameOrDescr);
if (config->get_aliases_flag && strlen(interfaces[i].alias)) {
addstr(&perf, " (%s)", interfaces[i].alias);
}
addstr(&perf, " is up");
}
if (config->lastcheck && (interfaces[i].speed || config->speed) &&
(interfaces[i].inbitps > 0ULL || interfaces[i].outbitps > 0ULL) && !interfaces[i].admin_down) {
char *ins;
char *outs;
gauge_to_si(interfaces[i].inbitps, &ins);
gauge_to_si(interfaces[i].outbitps, &outs);
addstr(&perf, " %sbps(%0.2f%%)/%sbps(%0.2f%%)", ins, inload, outs, outload);
free(ins);
free(outs);
}
if (perf.len > 0U && perf.text[(perf.len - 1U)] != '\n') {
addstr(&perf, "\n");
}
}
}
if (errorflag) {
printf("CRITICAL:");
} else if (warnflag) {
printf("WARNING:");
} else {
printf("OK:");
}
printf(" %d interface%s found", ifNumber, (ifNumber == 1) ? "" : "s");
if (config->iface_regex) {
printf(", of which %d matched the regex", number_of_matched_interfaces);
}
/* now print performance data */
printf("%*s | interfaces::check_multi::plugins=%d time=%.2Lf checktime=%ld", (int)out->len, out->text, number_of_matched_interfaces,
(((long double)time_value->tv_sec + ((long double)time_value->tv_usec / 1000000)) - starttime), time_value->tv_sec);
if (uptime) {
printf(" %sdevice::check_snmp::uptime=%us", config->prefix ? config->prefix : "", uptime);
}
for (int i = 0; i < ifNumber; i++) {
if (!interfaces[i].ignore && (!interfaces[i].admin_down || config->print_all_flag)) {
printf(" %s%s::check_snmp::", config->prefix ? config->prefix : "", oldperfdata[i].descr);
printf("%s=%lluc %s=%lluc", if_vars[0], interfaces[i].inOctets, if_vars[1], interfaces[i].outOctets);
printf(" %s=%luc %s=%luc", if_vars[2], interfaces[i].inDiscards, if_vars[3], interfaces[i].outDiscards);
printf(" %s=%luc %s=%luc", if_vars[4], interfaces[i].inErrors, if_vars[5], interfaces[i].outErrors);
printf(" %s=%luc %s=%luc", if_vars[6], interfaces[i].inUcast, if_vars[7], interfaces[i].outUcast);
if (config->speed) {
printf(" %s=%llu", if_vars[8], config->speed);
} else {
printf(" %s=%llu", if_vars[8], interfaces[i].speed);
}
printf(" %s=%llub %s=%llub", if_vars[9], interfaces[i].inbitps, if_vars[10], interfaces[i].outbitps);
}
}
printf("\n%*s", (int)perf.len, perf.text);
if (errorflag) {
return CRITICAL;
}
if (warnflag) {
return WARNING;
}
return OK;
}
bool fetch_interface_aliases(struct configuration_struct *config, char **oid_aliasp, netsnmp_session *snmp_session,
netsnmp_session *session, struct ifStruct *interfaces, int ifNumber) {
bool lastifflag = false;
int count = 0;
netsnmp_pdu *pdu;
struct OIDStruct lastOid;
netsnmp_pdu *response;
/* allocate the space for the alias OIDs */
struct OIDStruct *OIDp = (struct OIDStruct *)calloc(1, sizeof(struct OIDStruct));
while (lastifflag == false) {
/* build our request depending on the mode */
if (count == 0) {
create_pdu(config->mode, oid_aliasp, &pdu, &OIDp, 0, ifNumber);
} else {
/* we have not received all aliases in the preceding packet, so
* fetch the next lot */
if (config->mode == BINTEC || config->mode == NONBULK) {
pdu = snmp_pdu_create(SNMP_MSG_GETNEXT);
} else {
pdu = snmp_pdu_create(SNMP_MSG_GETBULK);
pdu->non_repeaters = 0;
pdu->max_repetitions = ifNumber - count;
}
snmp_add_null_var(pdu, lastOid.name, lastOid.name_len);
}
#ifdef DEBUG
implode_result = implode(", ", oid_aliasp + count);
benchmark_start("Send SNMP request for OIDs: %s", implode_result);
#endif
/* send the request */
int status;
status = snmp_synch_response(snmp_session, pdu, &response);
#ifdef DEBUG
benchmark_end();
free(implode_result);
#endif
if (config->sleep_usecs) {
usleep(config->sleep_usecs);
}
if (status == STAT_SUCCESS && response->errstat == SNMP_ERR_NOERROR) {
netsnmp_variable_list *vars;
vars = response->variables;
for (; vars; vars = vars->next_variable) {
/*
* if the next OID is shorter
* or if the next OID doesn't begin with our base OID
* then we have reached the end of the table :-)
* print_variable(vars->name, vars->name_length, vars);
*/