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freebsd-dev/usr.sbin/bsnmpd/tools/bsnmptools/bsnmpget.c
Shteryana Shopova b9288caaf6 Implement an option to execute SNMP walks using GETBULK requests in bsnmpwalk(1) 
retrieving multiple values with a Single PDU.

Reviewed by:	philip@
Tested by:	tsanand129 (at) gmail (dot) com
2012-01-10 15:29:03 +00:00

1290 lines
29 KiB
C
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/*-
* Copyright (c) 2005-2006 The FreeBSD Project
* All rights reserved.
*
* Author: Shteryana Shopova <syrinx@FreeBSD.org>
*
* Redistribution of this software and documentation and use in source and
* binary forms, with or without modification, are permitted provided that
* the following conditions are met:
*
* 1. Redistributions of source code or documentation must retain the above
* copyright notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* Bsnmpget and bsnmpwalk are simple tools for querying SNMP agents,
* bsnmpset can be used to set MIB objects in an agent.
*
* $FreeBSD$
*/
#include <sys/queue.h>
#include <sys/types.h>
#include <assert.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include <bsnmp/asn1.h>
#include <bsnmp/snmp.h>
#include <bsnmp/snmpclient.h>
#include "bsnmptc.h"
#include "bsnmptools.h"
static const char *program_name = NULL;
static enum program_e {
BSNMPGET,
BSNMPWALK,
BSNMPSET
} program;
/* *****************************************************************************
* Common bsnmptools functions.
*/
static void
usage(void)
{
fprintf(stderr,
"Usage:\n"
"%s %s [-A options] [-b buffersize] [-C options] [-I options]\n"
"\t[-i filelist] [-l filename]%s [-o output] [-P options]\n"
"\t%s[-r retries] [-s [trans::][community@][server][:port]]\n"
"\t[-t timeout] [-U options] [-v version]%s\n",
program_name,
(program == BSNMPGET) ? "[-aDdehnK]" :
(program == BSNMPWALK) ? "[-dhnK]" :
(program == BSNMPSET) ? "[-adehnK]" :
"",
(program == BSNMPGET || program == BSNMPWALK) ?
" [-M max-repetitions] [-N non-repeaters]" : "",
(program == BSNMPGET || program == BSNMPWALK) ? "[-p pdu] " : "",
(program == BSNMPGET) ? " OID [OID ...]" :
(program == BSNMPWALK || program == BSNMPSET) ? " [OID ...]" :
""
);
}
static int32_t
parse_max_repetitions(struct snmp_toolinfo *snmptoolctx, char *opt_arg)
{
uint32_t v;
assert(opt_arg != NULL);
v = strtoul(opt_arg, (void *) NULL, 10);
if (v > SNMP_MAX_BINDINGS) {
warnx("Max repetitions value greater than %d maximum allowed.",
SNMP_MAX_BINDINGS);
return (-1);
}
SET_MAXREP(snmptoolctx, v);
return (2);
}
static int32_t
parse_non_repeaters(struct snmp_toolinfo *snmptoolctx, char *opt_arg)
{
uint32_t v;
assert(opt_arg != NULL);
v = strtoul(opt_arg, (void *) NULL, 10);
if (v > SNMP_MAX_BINDINGS) {
warnx("Non repeaters value greater than %d maximum allowed.",
SNMP_MAX_BINDINGS);
return (-1);
}
SET_NONREP(snmptoolctx, v);
return (2);
}
static int32_t
parse_pdu_type(struct snmp_toolinfo *snmptoolctx, char *opt_arg)
{
assert(opt_arg != NULL);
if (strcasecmp(opt_arg, "getbulk") == 0)
SET_PDUTYPE(snmptoolctx, SNMP_PDU_GETBULK);
else if (strcasecmp(opt_arg, "getnext") == 0)
SET_PDUTYPE(snmptoolctx, SNMP_PDU_GETNEXT);
else if (strcasecmp(opt_arg, "get") == 0)
SET_PDUTYPE(snmptoolctx, SNMP_PDU_GET);
else {
warnx("PDU type '%s' not supported.", opt_arg);
return (-1);
}
return (2);
}
static int32_t
snmptool_parse_options(struct snmp_toolinfo *snmptoolctx, int argc, char **argv)
{
int32_t count, optnum = 0;
int ch;
const char *opts;
switch (program) {
case BSNMPWALK:
opts = "dhnKA:b:C:I:i:l:M:N:o:P:p:r:s:t:U:v:";
break;
case BSNMPGET:
opts = "aDdehnKA:b:C:I:i:l:M:N:o:P:p:r:s:t:U:v:";
break;
case BSNMPSET:
opts = "adehnKA:b:C:I:i:l:o:P:r:s:t:U:v:";
break;
default:
return (-1);
}
while ((ch = getopt(argc, argv, opts)) != EOF) {
switch (ch) {
case 'A':
count = parse_authentication(snmptoolctx, optarg);
break;
case 'a':
count = parse_skip_access(snmptoolctx);
break;
case 'b':
count = parse_buflen(optarg);
break;
case 'D':
count = parse_discovery(snmptoolctx);
break;
case 'd':
count = parse_debug();
break;
case 'e':
count = parse_errors(snmptoolctx);
break;
case 'h':
usage();
return (-2);
case 'C':
count = parse_context(snmptoolctx, optarg);
break;
case 'I':
count = parse_include(snmptoolctx, optarg);
break;
case 'i':
count = parse_file(snmptoolctx, optarg);
break;
case 'K':
count = parse_local_key(snmptoolctx);
break;
case 'l':
count = parse_local_path(optarg);
break;
case 'M':
count = parse_max_repetitions(snmptoolctx, optarg);
break;
case 'N':
count = parse_non_repeaters(snmptoolctx, optarg);
break;
case 'n':
count = parse_num_oids(snmptoolctx);
break;
case 'o':
count = parse_output(snmptoolctx, optarg);
break;
case 'P':
count = parse_privacy(snmptoolctx, optarg);
break;
case 'p':
count = parse_pdu_type(snmptoolctx, optarg);
break;
case 'r':
count = parse_retry(optarg);
break;
case 's':
count = parse_server(optarg);
break;
case 't':
count = parse_timeout(optarg);
break;
case 'U':
count = parse_user_security(snmptoolctx, optarg);
break;
case 'v':
count = parse_version(optarg);
break;
case '?':
default:
usage();
return (-1);
}
if (count < 0)
return (-1);
optnum += count;
}
return (optnum);
}
/*
* Read user input OID - one of following formats:
* 1) 1.2.1.1.2.1.0 - that is if option numeric was given;
* 2) string - in such case append .0 to the asn_oid subs;
* 3) string.1 - no additional processing required in such case.
*/
static char *
snmptools_parse_stroid(struct snmp_toolinfo *snmptoolctx,
struct snmp_object *obj, char *argv)
{
char string[MAXSTR], *str;
int32_t i = 0;
struct asn_oid in_oid;
str = argv;
if (*str == '.')
str++;
while (isalpha(*str) || *str == '_' || (i != 0 && isdigit(*str))) {
str++;
i++;
}
if (i <= 0 || i >= MAXSTR)
return (NULL);
memset(&in_oid, 0, sizeof(struct asn_oid));
if ((str = snmp_parse_suboid((argv + i), &in_oid)) == NULL) {
warnx("Invalid OID - %s", argv);
return (NULL);
}
strlcpy(string, argv, i + 1);
if (snmp_lookup_oidall(snmptoolctx, obj, string) < 0) {
warnx("No entry for %s in mapping lists", string);
return (NULL);
}
/* If OID given on command line append it. */
if (in_oid.len > 0)
asn_append_oid(&(obj->val.var), &in_oid);
else if (*str == '[') {
if ((str = snmp_parse_index(snmptoolctx, str + 1, obj)) == NULL)
return (NULL);
} else if (obj->val.syntax > 0 && GET_PDUTYPE(snmptoolctx) ==
SNMP_PDU_GET) {
if (snmp_suboid_append(&(obj->val.var), (asn_subid_t) 0) < 0)
return (NULL);
}
return (str);
}
static int32_t
snmptools_parse_oid(struct snmp_toolinfo *snmptoolctx,
struct snmp_object *obj, char *argv)
{
if (argv == NULL)
return (-1);
if (ISSET_NUMERIC(snmptoolctx)) {
if (snmp_parse_numoid(argv, &(obj->val.var)) < 0)
return (-1);
} else {
if (snmptools_parse_stroid(snmptoolctx, obj, argv) == NULL &&
snmp_parse_numoid(argv, &(obj->val.var)) < 0)
return (-1);
}
return (1);
}
static int32_t
snmptool_add_vbind(struct snmp_pdu *pdu, struct snmp_object *obj)
{
if (obj->error > 0)
return (0);
asn_append_oid(&(pdu->bindings[pdu->nbindings].var), &(obj->val.var));
pdu->nbindings++;
return (pdu->nbindings);
}
/* *****************************************************************************
* bsnmpget private functions.
*/
static int32_t
snmpget_verify_vbind(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu,
struct snmp_object *obj)
{
if (pdu->version == SNMP_V1 && obj->val.syntax ==
SNMP_SYNTAX_COUNTER64) {
warnx("64-bit counters are not supported in SNMPv1 PDU");
return (-1);
}
if (ISSET_NUMERIC(snmptoolctx) || pdu->type == SNMP_PDU_GETNEXT ||
pdu->type == SNMP_PDU_GETBULK)
return (1);
if (pdu->type == SNMP_PDU_GET && obj->val.syntax == SNMP_SYNTAX_NULL) {
warnx("Only leaf object values can be added to GET PDU");
return (-1);
}
return (1);
}
/*
* In case of a getbulk PDU, the error_status and error_index fields are used by
* libbsnmp to hold the values of the non-repeaters and max-repetitions fields
* that are present only in the getbulk - so before sending the PDU make sure
* these have correct values as well.
*/
static void
snmpget_fix_getbulk(struct snmp_pdu *pdu, uint32_t max_rep, uint32_t non_rep)
{
assert(pdu != NULL);
if (pdu->nbindings < non_rep)
pdu->error_status = pdu->nbindings;
else
pdu->error_status = non_rep;
if (max_rep > 0)
pdu->error_index = max_rep;
else
pdu->error_index = 1;
}
static int
snmptool_get(struct snmp_toolinfo *snmptoolctx)
{
struct snmp_pdu req, resp;
snmp_pdu_create(&req, GET_PDUTYPE(snmptoolctx));
while ((snmp_pdu_add_bindings(snmptoolctx, snmpget_verify_vbind,
snmptool_add_vbind, &req, SNMP_MAX_BINDINGS)) > 0) {
if (GET_PDUTYPE(snmptoolctx) == SNMP_PDU_GETBULK)
snmpget_fix_getbulk(&req, GET_MAXREP(snmptoolctx),
GET_NONREP(snmptoolctx));
if (snmp_dialog(&req, &resp) == -1) {
warnx("Snmp dialog - %s", strerror(errno));
break;
}
if (snmp_parse_resp(&resp, &req) >= 0) {
snmp_output_resp(snmptoolctx, &resp, NULL);
break;
}
snmp_output_err_resp(snmptoolctx, &resp);
if (GET_PDUTYPE(snmptoolctx) == SNMP_PDU_GETBULK ||
!ISSET_RETRY(snmptoolctx))
break;
/*
* Loop through the object list and set object->error to the
* varbinding that caused the error.
*/
if (snmp_object_seterror(snmptoolctx,
&(resp.bindings[resp.error_index - 1]),
resp.error_status) <= 0)
break;
fprintf(stderr, "Retrying...\n");
snmp_pdu_free(&resp);
snmp_pdu_create(&req, GET_PDUTYPE(snmptoolctx));
}
snmp_pdu_free(&resp);
return (0);
}
/* *****************************************************************************
* bsnmpwalk private functions.
*/
/* The default tree to walk. */
static const struct asn_oid snmp_mibII_OID = {
6 , { 1, 3, 6, 1, 2, 1 }
};
static int32_t
snmpwalk_add_default(struct snmp_toolinfo *snmptoolctx __unused,
struct snmp_object *obj, char *string __unused)
{
asn_append_oid(&(obj->val.var), &snmp_mibII_OID);
return (1);
}
/*
* Prepare the next GetNext/Get PDU to send.
*/
static void
snmpwalk_nextpdu_create(uint32_t op, struct asn_oid *var, struct snmp_pdu *pdu)
{
snmp_pdu_create(pdu, op);
asn_append_oid(&(pdu->bindings[0].var), var);
pdu->nbindings = 1;
}
static int
snmptool_walk(struct snmp_toolinfo *snmptoolctx)
{
struct snmp_pdu req, resp;
struct asn_oid root; /* Keep the initial oid. */
int32_t outputs, rc;
uint32_t op;
if (GET_PDUTYPE(snmptoolctx) == SNMP_PDU_GETBULK)
op = SNMP_PDU_GETBULK;
else
op = SNMP_PDU_GETNEXT;
snmp_pdu_create(&req, op);
while ((rc = snmp_pdu_add_bindings(snmptoolctx, NULL,
snmptool_add_vbind, &req, 1)) > 0) {
/* Remember the root where the walk started from. */
memset(&root, 0, sizeof(struct asn_oid));
asn_append_oid(&root, &(req.bindings[0].var));
if (op == SNMP_PDU_GETBULK)
snmpget_fix_getbulk(&req, GET_MAXREP(snmptoolctx),
GET_NONREP(snmptoolctx));
outputs = 0;
while (snmp_dialog(&req, &resp) >= 0) {
if ((snmp_parse_resp(&resp, &req)) < 0) {
snmp_output_err_resp(snmptoolctx, &resp);
snmp_pdu_free(&resp);
outputs = -1;
break;
}
rc = snmp_output_resp(snmptoolctx, &resp, &root);
if (rc < 0) {
snmp_pdu_free(&resp);
outputs = -1;
break;
}
outputs += rc;
snmp_pdu_free(&resp);
if (rc < resp.nbindings)
break;
snmpwalk_nextpdu_create(op,
&(resp.bindings[resp.nbindings - 1].var), &req);
if (op == SNMP_PDU_GETBULK)
snmpget_fix_getbulk(&req, GET_MAXREP(snmptoolctx),
GET_NONREP(snmptoolctx));
}
/* Just in case our root was a leaf. */
if (outputs == 0) {
snmpwalk_nextpdu_create(SNMP_PDU_GET, &root, &req);
if (snmp_dialog(&req, &resp) == SNMP_CODE_OK) {
if (snmp_parse_resp(&resp,&req) < 0)
snmp_output_err_resp(snmptoolctx, &resp);
else
snmp_output_resp(snmptoolctx, &(resp), NULL);
snmp_pdu_free(&resp);
} else
warnx("Snmp dialog - %s", strerror(errno));
}
if (snmp_object_remove(snmptoolctx, &root) < 0) {
warnx("snmp_object_remove");
break;
}
snmp_pdu_create(&req, op);
}
if (rc == 0)
return (0);
else
return (1);
}
/* *****************************************************************************
* bsnmpset private functions.
*/
static int32_t
parse_oid_numeric(struct snmp_value *value, char *val)
{
char *endptr;
int32_t saved_errno;
asn_subid_t suboid;
do {
saved_errno = errno;
errno = 0;
suboid = strtoul(val, &endptr, 10);
if (errno != 0) {
warnx("Value %s not supported - %s", val,
strerror(errno));
errno = saved_errno;
return (-1);
}
errno = saved_errno;
if ((asn_subid_t) suboid > ASN_MAXID) {
warnx("Suboid %u > ASN_MAXID", suboid);
return (-1);
}
if (snmp_suboid_append(&(value->v.oid), suboid) < 0)
return (-1);
val = endptr + 1;
} while (*endptr == '.');
if (*endptr != '\0')
warnx("OID value %s not supported", val);
value->syntax = SNMP_SYNTAX_OID;
return (0);
}
/*
* Allow OID leaf in both forms:
* 1) 1.3.6.1.2... -> in such case call directly the function reading raw OIDs;
* 2) begemotSnmpdAgentFreeBSD -> lookup the ASN OID corresponding to that.
*/
static int32_t
parse_oid_string(struct snmp_toolinfo *snmptoolctx,
struct snmp_value *value, char *string)
{
struct snmp_object obj;
if (isdigit(string[0]))
return (parse_oid_numeric(value, string));
memset(&obj, 0, sizeof(struct snmp_object));
if (snmp_lookup_enumoid(snmptoolctx, &obj, string) < 0) {
warnx("Unknown OID enum string - %s", string);
return (-1);
}
asn_append_oid(&(value->v.oid), &(obj.val.var));
return (1);
}
static int32_t
parse_ip(struct snmp_value * value, char * val)
{
uint32_t v;
int32_t i;
char *endptr, *str;
str = val;
for (i = 0; i < 4; i++) {
v = strtoul(str, &endptr, 10);
if (v > 0xff)
return (-1);
if (*endptr != '.' && *endptr != '\0' && i != 3)
break;
str = endptr + 1;
value->v.ipaddress[i] = (uint8_t) v;
}
value->syntax = SNMP_SYNTAX_IPADDRESS;
return (0);
}
static int32_t
parse_int(struct snmp_value *value, char *val)
{
char *endptr;
int32_t v, saved_errno;
saved_errno = errno;
errno = 0;
v = strtol(val, &endptr, 10);
if (errno != 0) {
warnx("Value %s not supported - %s", val, strerror(errno));
errno = saved_errno;
return (-1);
}
value->syntax = SNMP_SYNTAX_INTEGER;
value->v.integer = v;
errno = saved_errno;
return (0);
}
static int32_t
parse_int_string(struct snmp_object *object, char *val)
{
int32_t v;
if (isdigit(val[0]))
return ((parse_int(&(object->val), val)));
if (object->info == NULL) {
warnx("Unknown enumerated integer type - %s", val);
return (-1);
}
if ((v = enum_number_lookup(object->info->snmp_enum, val)) < 0)
warnx("Unknown enumerated integer type - %s", val);
object->val.v.integer = v;
return (1);
}
/*
* Here syntax may be one of SNMP_SYNTAX_COUNTER, SNMP_SYNTAX_GAUGE,
* SNMP_SYNTAX_TIMETICKS.
*/
static int32_t
parse_uint(struct snmp_value *value, char *val)
{
char *endptr;
uint32_t v = 0;
int32_t saved_errno;
saved_errno = errno;
errno = 0;
v = strtoul(val, &endptr, 10);
if (errno != 0) {
warnx("Value %s not supported - %s", val, strerror(errno));
errno = saved_errno;
return (-1);
}
value->v.uint32 = v;
errno = saved_errno;
return (0);
}
static int32_t
parse_ticks(struct snmp_value *value, char *val)
{
if (parse_uint(value, val) < 0)
return (-1);
value->syntax = SNMP_SYNTAX_TIMETICKS;
return (0);
}
static int32_t
parse_gauge(struct snmp_value *value, char *val)
{
if (parse_uint(value, val) < 0)
return (-1);
value->syntax = SNMP_SYNTAX_GAUGE;
return (0);
}
static int32_t
parse_counter(struct snmp_value *value, char *val)
{
if (parse_uint(value, val) < 0)
return (-1);
value->syntax = SNMP_SYNTAX_COUNTER;
return (0);
}
static int32_t
parse_uint64(struct snmp_value *value, char *val)
{
char *endptr;
int32_t saved_errno;
uint64_t v;
saved_errno = errno;
errno = 0;
v = strtoull(val, &endptr, 10);
if (errno != 0) {
warnx("Value %s not supported - %s", val, strerror(errno));
errno = saved_errno;
return (-1);
}
value->syntax = SNMP_SYNTAX_COUNTER64;
value->v.counter64 = v;
errno = saved_errno;
return (0);
}
static int32_t
parse_syntax_val(struct snmp_value *value, enum snmp_syntax syntax, char *val)
{
switch (syntax) {
case SNMP_SYNTAX_INTEGER:
return (parse_int(value, val));
case SNMP_SYNTAX_IPADDRESS:
return (parse_ip(value, val));
case SNMP_SYNTAX_COUNTER:
return (parse_counter(value, val));
case SNMP_SYNTAX_GAUGE:
return (parse_gauge(value, val));
case SNMP_SYNTAX_TIMETICKS:
return (parse_ticks(value, val));
case SNMP_SYNTAX_COUNTER64:
return (parse_uint64(value, val));
case SNMP_SYNTAX_OCTETSTRING:
return (snmp_tc2oct(SNMP_STRING, value, val));
case SNMP_SYNTAX_OID:
return (parse_oid_numeric(value, val));
default:
/* NOTREACHED */
break;
}
return (-1);
}
/*
* Parse a command line argument of type OID=syntax:value and fill in whatever
* fields can be derived from the input into snmp_value structure. Reads numeric
* OIDs.
*/
static int32_t
parse_pair_numoid_val(char *str, struct snmp_value *snmp_val)
{
int32_t cnt;
char *ptr;
enum snmp_syntax syntax;
char oid_str[ASN_OIDSTRLEN];
ptr = str;
for (cnt = 0; cnt < ASN_OIDSTRLEN; cnt++)
if (ptr[cnt] == '=')
break;
if (cnt >= ASN_OIDSTRLEN) {
warnx("OID too long - %s", str);
return (-1);
}
strlcpy(oid_str, ptr, (size_t) (cnt + 1));
ptr = str + cnt + 1;
for (cnt = 0; cnt < MAX_CMD_SYNTAX_LEN; cnt++)
if(ptr[cnt] == ':')
break;
if (cnt >= MAX_CMD_SYNTAX_LEN) {
warnx("Unknown syntax in OID - %s", str);
return (-1);
}
if ((syntax = parse_syntax(ptr)) <= SNMP_SYNTAX_NULL) {
warnx("Unknown syntax in OID - %s", ptr);
return (-1);
}
ptr = ptr + cnt + 1;
for (cnt = 0; cnt < MAX_OCTSTRING_LEN; cnt++)
if (ptr[cnt] == '\0')
break;
if (ptr[cnt] != '\0') {
warnx("Value string too long - %s",ptr);
return (-1);
}
/*
* Here try parsing the OIDs and syntaxes and then check values - have
* to know syntax to check value boundaries.
*/
if (snmp_parse_numoid(oid_str, &(snmp_val->var)) < 0) {
warnx("Error parsing OID %s",oid_str);
return (-1);
}
if (parse_syntax_val(snmp_val, syntax, ptr) < 0)
return (-1);
return (1);
}
/* XXX-BZ aruments should be swapped. */
static int32_t
parse_syntax_strval(struct snmp_toolinfo *snmptoolctx, char *str,
struct snmp_object *object)
{
uint32_t len;
enum snmp_syntax syn;
/*
* Syntax string here not required - still may be present.
*/
if (GET_OUTPUT(snmptoolctx) == OUTPUT_VERBOSE) {
for (len = 0 ; *(str + len) != ':'; len++) {
if (*(str + len) == '\0') {
warnx("Syntax missing in value - %s", str);
return (-1);
}
}
if ((syn = parse_syntax(str)) <= SNMP_SYNTAX_NULL) {
warnx("Unknown syntax in - %s", str);
return (-1);
}
if (syn != object->val.syntax) {
if (!ISSET_ERRIGNORE(snmptoolctx)) {
warnx("Bad syntax in - %s", str);
return (-1);
} else
object->val.syntax = syn;
}
len++;
} else
len = 0;
switch (object->val.syntax) {
case SNMP_SYNTAX_INTEGER:
return (parse_int_string(object, str + len));
case SNMP_SYNTAX_IPADDRESS:
return (parse_ip(&(object->val), str + len));
case SNMP_SYNTAX_COUNTER:
return (parse_counter(&(object->val), str + len));
case SNMP_SYNTAX_GAUGE:
return (parse_gauge(&(object->val), str + len));
case SNMP_SYNTAX_TIMETICKS:
return (parse_ticks(&(object->val), str + len));
case SNMP_SYNTAX_COUNTER64:
return (parse_uint64(&(object->val), str + len));
case SNMP_SYNTAX_OCTETSTRING:
return (snmp_tc2oct(object->info->tc, &(object->val),
str + len));
case SNMP_SYNTAX_OID:
return (parse_oid_string(snmptoolctx, &(object->val),
str + len));
default:
/* NOTREACHED */
break;
}
return (-1);
}
static int32_t
parse_pair_stroid_val(struct snmp_toolinfo *snmptoolctx,
struct snmp_object *obj, char *argv)
{
char *ptr;
if ((ptr = snmptools_parse_stroid(snmptoolctx, obj, argv)) == NULL)
return (-1);
if (*ptr != '=') {
warnx("Value to set expected after OID");
return (-1);
}
if (parse_syntax_strval(snmptoolctx, ptr + 1, obj) < 0)
return (-1);
return (1);
}
static int32_t
snmpset_parse_oid(struct snmp_toolinfo *snmptoolctx,
struct snmp_object *obj, char *argv)
{
if (argv == NULL)
return (-1);
if (ISSET_NUMERIC(snmptoolctx)) {
if (parse_pair_numoid_val(argv, &(obj->val)) < 0)
return (-1);
} else {
if (parse_pair_stroid_val(snmptoolctx, obj, argv) < 0)
return (-1);
}
return (1);
}
static int32_t
add_ip_syntax(struct snmp_value *dst, struct snmp_value *src)
{
int8_t i;
dst->syntax = SNMP_SYNTAX_IPADDRESS;
for (i = 0; i < 4; i++)
dst->v.ipaddress[i] = src->v.ipaddress[i];
return (1);
}
static int32_t
add_octstring_syntax(struct snmp_value *dst, struct snmp_value *src)
{
if (src->v.octetstring.len > ASN_MAXOCTETSTRING) {
warnx("OctetString len too big - %u",src->v.octetstring.len);
return (-1);
}
if ((dst->v.octetstring.octets = malloc(src->v.octetstring.len)) ==
NULL) {
syslog(LOG_ERR, "malloc() failed - %s", strerror(errno));
return (-1);
}
memcpy(dst->v.octetstring.octets, src->v.octetstring.octets,
src->v.octetstring.len);
dst->syntax = SNMP_SYNTAX_OCTETSTRING;
dst->v.octetstring.len = src->v.octetstring.len;
return(0);
}
static int32_t
add_oid_syntax(struct snmp_value *dst, struct snmp_value *src)
{
asn_append_oid(&(dst->v.oid), &(src->v.oid));
dst->syntax = SNMP_SYNTAX_OID;
return (0);
}
/*
* Check syntax - if one of SNMP_SYNTAX_NULL, SNMP_SYNTAX_NOSUCHOBJECT,
* SNMP_SYNTAX_NOSUCHINSTANCE, SNMP_SYNTAX_ENDOFMIBVIEW or anything not known -
* return error.
*/
static int32_t
snmpset_add_value(struct snmp_value *dst, struct snmp_value *src)
{
if (dst == NULL || src == NULL)
return (-1);
switch (src->syntax) {
case SNMP_SYNTAX_INTEGER:
dst->v.integer = src->v.integer;
dst->syntax = SNMP_SYNTAX_INTEGER;
break;
case SNMP_SYNTAX_TIMETICKS:
dst->v.uint32 = src->v.uint32;
dst->syntax = SNMP_SYNTAX_TIMETICKS;
break;
case SNMP_SYNTAX_GAUGE:
dst->v.uint32 = src->v.uint32;
dst->syntax = SNMP_SYNTAX_GAUGE;
break;
case SNMP_SYNTAX_COUNTER:
dst->v.uint32 = src->v.uint32;
dst->syntax = SNMP_SYNTAX_COUNTER;
break;
case SNMP_SYNTAX_COUNTER64:
dst->v.counter64 = src->v.counter64;
dst->syntax = SNMP_SYNTAX_COUNTER64;
break;
case SNMP_SYNTAX_IPADDRESS:
add_ip_syntax(dst, src);
break;
case SNMP_SYNTAX_OCTETSTRING:
add_octstring_syntax(dst, src);
break;
case SNMP_SYNTAX_OID:
add_oid_syntax(dst, src);
break;
default:
warnx("Unknown syntax %d", src->syntax);
return (-1);
}
return (0);
}
static int32_t
snmpset_verify_vbind(struct snmp_toolinfo *snmptoolctx, struct snmp_pdu *pdu,
struct snmp_object *obj)
{
if (pdu->version == SNMP_V1 && obj->val.syntax ==
SNMP_SYNTAX_COUNTER64) {
warnx("64-bit counters are not supported in SNMPv1 PDU");
return (-1);
}
if (ISSET_NUMERIC(snmptoolctx) || ISSET_ERRIGNORE(snmptoolctx))
return (1);
if (obj->info->access < SNMP_ACCESS_SET) {
warnx("Object %s not accessible for set - try 'bsnmpset -a'",
obj->info->string);
return (-1);
}
return (1);
}
static int32_t
snmpset_add_vbind(struct snmp_pdu *pdu, struct snmp_object *obj)
{
if (pdu->nbindings > SNMP_MAX_BINDINGS) {
warnx("Too many OIDs for one PDU");
return (-1);
}
if (obj->error > 0)
return (0);
if (snmpset_add_value(&(pdu->bindings[pdu->nbindings]), &(obj->val))
< 0)
return (-1);
asn_append_oid(&(pdu->bindings[pdu->nbindings].var), &(obj->val.var));
pdu->nbindings++;
return (pdu->nbindings);
}
static int
snmptool_set(struct snmp_toolinfo *snmptoolctx)
{
struct snmp_pdu req, resp;
snmp_pdu_create(&req, SNMP_PDU_SET);
while ((snmp_pdu_add_bindings(snmptoolctx, snmpset_verify_vbind,
snmpset_add_vbind, &req, SNMP_MAX_BINDINGS)) > 0) {
if (snmp_dialog(&req, &resp)) {
warnx("Snmp dialog - %s", strerror(errno));
break;
}
if (snmp_pdu_check(&req, &resp) > 0) {
if (GET_OUTPUT(snmptoolctx) != OUTPUT_QUIET)
snmp_output_resp(snmptoolctx, &resp, NULL);
break;
}
snmp_output_err_resp(snmptoolctx, &resp);
if (!ISSET_RETRY(snmptoolctx))
break;
if (snmp_object_seterror(snmptoolctx,
&(resp.bindings[resp.error_index - 1]),
resp.error_status) <= 0)
break;
fprintf(stderr, "Retrying...\n");
snmp_pdu_free(&req);
snmp_pdu_free(&resp);
snmp_pdu_create(&req, SNMP_PDU_SET);
}
snmp_pdu_free(&resp);
return (0);
}
/* *****************************************************************************
* main
*/
/*
* According to command line options prepare SNMP Get | GetNext | GetBulk PDU.
* Wait for a response and print it.
*/
/*
* Do a 'snmp walk' - according to command line options request for values
* lexicographically subsequent and subrooted at a common node. Send a GetNext
* PDU requesting the value for each next variable and print the response. Stop
* when a Response PDU is received that contains the value of a variable not
* subrooted at the variable the walk started.
*/
int
main(int argc, char ** argv)
{
struct snmp_toolinfo snmptoolctx;
int32_t oid_cnt, last_oid, opt_num;
int rc = 0;
/* Make sure program_name is set and valid. */
if (*argv == NULL)
program_name = "snmptool";
else {
program_name = strrchr(*argv, '/');
if (program_name != NULL)
program_name++;
else
program_name = *argv;
}
if (program_name == NULL) {
fprintf(stderr, "Error: No program name?\n");
exit (1);
} else if (strcmp(program_name, "bsnmpget") == 0)
program = BSNMPGET;
else if (strcmp(program_name, "bsnmpwalk") == 0)
program = BSNMPWALK;
else if (strcmp(program_name, "bsnmpset") == 0)
program = BSNMPSET;
else {
fprintf(stderr, "Unknown snmp tool name '%s'.\n", program_name);
exit (1);
}
/* Initialize. */
if (snmptool_init(&snmptoolctx) < 0)
exit (1);
if ((opt_num = snmptool_parse_options(&snmptoolctx, argc, argv)) < 0) {
snmp_tool_freeall(&snmptoolctx);
/* On -h (help) exit without error. */
if (opt_num == -2)
exit(0);
else
exit(1);
}
oid_cnt = argc - opt_num - 1;
if (oid_cnt == 0) {
switch (program) {
case BSNMPGET:
if (!ISSET_EDISCOVER(&snmptoolctx) &&
!ISSET_LOCALKEY(&snmptoolctx)) {
fprintf(stderr, "No OID given.\n");
usage();
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
break;
case BSNMPWALK:
if (snmp_object_add(&snmptoolctx, snmpwalk_add_default,
NULL) < 0) {
fprintf(stderr,
"Error setting default subtree.\n");
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
break;
case BSNMPSET:
fprintf(stderr, "No OID given.\n");
usage();
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
}
if (snmp_import_all(&snmptoolctx) < 0) {
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
/* A simple sanity check - can not send GETBULK when using SNMPv1. */
if (program == BSNMPGET && snmp_client.version == SNMP_V1 &&
GET_PDUTYPE(&snmptoolctx) == SNMP_PDU_GETBULK) {
fprintf(stderr, "Cannot send GETBULK PDU with SNMPv1.\n");
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
for (last_oid = argc - 1; oid_cnt > 0; last_oid--, oid_cnt--) {
if ((snmp_object_add(&snmptoolctx, (program == BSNMPSET) ?
snmpset_parse_oid : snmptools_parse_oid,
argv[last_oid])) < 0) {
fprintf(stderr, "Error parsing OID string '%s'.\n",
argv[last_oid]);
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
}
if (snmp_open(NULL, NULL, NULL, NULL)) {
warnx("Failed to open snmp session: %s.", strerror(errno));
snmp_tool_freeall(&snmptoolctx);
exit(1);
}
if (snmp_client.version == SNMP_V3 && snmp_client.engine.engine_len == 0)
SET_EDISCOVER(&snmptoolctx);
if (ISSET_EDISCOVER(&snmptoolctx) &&
snmp_discover_engine(snmptoolctx.passwd) < 0) {
warnx("Unknown SNMP Engine ID: %s.", strerror(errno));
rc = 1;
goto cleanup;
}
if (GET_OUTPUT(&snmptoolctx) == OUTPUT_VERBOSE ||
ISSET_EDISCOVER(&snmptoolctx))
snmp_output_engine();
if (snmp_client.version == SNMP_V3 && ISSET_LOCALKEY(&snmptoolctx) &&
!ISSET_EDISCOVER(&snmptoolctx)) {
if (snmp_passwd_to_keys(&snmp_client.user,
snmptoolctx.passwd) != SNMP_CODE_OK ||
snmp_get_local_keys(&snmp_client.user,
snmp_client.engine.engine_id,
snmp_client.engine.engine_len) != SNMP_CODE_OK) {
warnx("Failed to get keys: %s.", strerror(errno));
rc = 1;
goto cleanup;
}
}
if (GET_OUTPUT(&snmptoolctx) == OUTPUT_VERBOSE ||
ISSET_EDISCOVER(&snmptoolctx))
snmp_output_keys();
if (ISSET_EDISCOVER(&snmptoolctx) && snmptoolctx.objects == 0)
goto cleanup;
switch (program) {
case BSNMPGET:
rc = snmptool_get(&snmptoolctx);
break;
case BSNMPWALK:
rc = snmptool_walk(&snmptoolctx);
break;
case BSNMPSET:
rc = snmptool_set(&snmptoolctx);
break;
}
cleanup:
snmp_tool_freeall(&snmptoolctx);
snmp_close();
exit(rc);
}
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