/contrib/bsnmp/lib/snmp.c
https://bitbucket.org/freebsd/freebsd-head/ · C · 1453 lines · 1146 code · 223 blank · 84 comment · 394 complexity · 84cc7c07a3f1e42cb84f51467d0d25c2 MD5 · raw file
- /*
- * Copyright (c) 2001-2003
- * Fraunhofer Institute for Open Communication Systems (FhG Fokus).
- * All rights reserved.
- *
- * Author: Harti Brandt <harti@freebsd.org>
- *
- * Copyright (c) 2010 The FreeBSD Foundation
- * All rights reserved.
- *
- * Portions of this software were developed by Shteryana Sotirova Shopova
- * under sponsorship from the FreeBSD Foundation.
- *
- * Redistribution 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 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 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 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.
- *
- * $Begemot: bsnmp/lib/snmp.c,v 1.40 2005/10/04 14:32:42 brandt_h Exp $
- *
- * SNMP
- */
- #include <sys/types.h>
- #include <sys/socket.h>
- #include <stdio.h>
- #include <stdlib.h>
- #include <stddef.h>
- #include <stdarg.h>
- #ifdef HAVE_STDINT_H
- #include <stdint.h>
- #elif defined(HAVE_INTTYPES_H)
- #include <inttypes.h>
- #endif
- #include <string.h>
- #include <ctype.h>
- #include <netdb.h>
- #include <errno.h>
- #include "asn1.h"
- #include "snmp.h"
- #include "snmppriv.h"
- static void snmp_error_func(const char *, ...);
- static void snmp_printf_func(const char *, ...);
- void (*snmp_error)(const char *, ...) = snmp_error_func;
- void (*snmp_printf)(const char *, ...) = snmp_printf_func;
- /*
- * Get the next variable binding from the list.
- * ASN errors on the sequence or the OID are always fatal.
- */
- static enum asn_err
- get_var_binding(struct asn_buf *b, struct snmp_value *binding)
- {
- u_char type;
- asn_len_t len, trailer;
- enum asn_err err;
- if (asn_get_sequence(b, &len) != ASN_ERR_OK) {
- snmp_error("cannot parse varbind header");
- return (ASN_ERR_FAILED);
- }
- /* temporary truncate the length so that the parser does not
- * eat up bytes behind the sequence in the case the encoding is
- * wrong of inner elements. */
- trailer = b->asn_len - len;
- b->asn_len = len;
- if (asn_get_objid(b, &binding->var) != ASN_ERR_OK) {
- snmp_error("cannot parse binding objid");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_header(b, &type, &len) != ASN_ERR_OK) {
- snmp_error("cannot parse binding value header");
- return (ASN_ERR_FAILED);
- }
- switch (type) {
- case ASN_TYPE_NULL:
- binding->syntax = SNMP_SYNTAX_NULL;
- err = asn_get_null_raw(b, len);
- break;
- case ASN_TYPE_INTEGER:
- binding->syntax = SNMP_SYNTAX_INTEGER;
- err = asn_get_integer_raw(b, len, &binding->v.integer);
- break;
- case ASN_TYPE_OCTETSTRING:
- binding->syntax = SNMP_SYNTAX_OCTETSTRING;
- binding->v.octetstring.octets = malloc(len);
- if (binding->v.octetstring.octets == NULL) {
- snmp_error("%s", strerror(errno));
- return (ASN_ERR_FAILED);
- }
- binding->v.octetstring.len = len;
- err = asn_get_octetstring_raw(b, len,
- binding->v.octetstring.octets,
- &binding->v.octetstring.len);
- if (ASN_ERR_STOPPED(err)) {
- free(binding->v.octetstring.octets);
- binding->v.octetstring.octets = NULL;
- }
- break;
- case ASN_TYPE_OBJID:
- binding->syntax = SNMP_SYNTAX_OID;
- err = asn_get_objid_raw(b, len, &binding->v.oid);
- break;
- case ASN_CLASS_APPLICATION|ASN_APP_IPADDRESS:
- binding->syntax = SNMP_SYNTAX_IPADDRESS;
- err = asn_get_ipaddress_raw(b, len, binding->v.ipaddress);
- break;
- case ASN_CLASS_APPLICATION|ASN_APP_TIMETICKS:
- binding->syntax = SNMP_SYNTAX_TIMETICKS;
- err = asn_get_uint32_raw(b, len, &binding->v.uint32);
- break;
- case ASN_CLASS_APPLICATION|ASN_APP_COUNTER:
- binding->syntax = SNMP_SYNTAX_COUNTER;
- err = asn_get_uint32_raw(b, len, &binding->v.uint32);
- break;
- case ASN_CLASS_APPLICATION|ASN_APP_GAUGE:
- binding->syntax = SNMP_SYNTAX_GAUGE;
- err = asn_get_uint32_raw(b, len, &binding->v.uint32);
- break;
- case ASN_CLASS_APPLICATION|ASN_APP_COUNTER64:
- binding->syntax = SNMP_SYNTAX_COUNTER64;
- err = asn_get_counter64_raw(b, len, &binding->v.counter64);
- break;
- case ASN_CLASS_CONTEXT | ASN_EXCEPT_NOSUCHOBJECT:
- binding->syntax = SNMP_SYNTAX_NOSUCHOBJECT;
- err = asn_get_null_raw(b, len);
- break;
- case ASN_CLASS_CONTEXT | ASN_EXCEPT_NOSUCHINSTANCE:
- binding->syntax = SNMP_SYNTAX_NOSUCHINSTANCE;
- err = asn_get_null_raw(b, len);
- break;
- case ASN_CLASS_CONTEXT | ASN_EXCEPT_ENDOFMIBVIEW:
- binding->syntax = SNMP_SYNTAX_ENDOFMIBVIEW;
- err = asn_get_null_raw(b, len);
- break;
- default:
- if ((err = asn_skip(b, len)) == ASN_ERR_OK)
- err = ASN_ERR_TAG;
- snmp_error("bad binding value type 0x%x", type);
- break;
- }
- if (ASN_ERR_STOPPED(err)) {
- snmp_error("cannot parse binding value");
- return (err);
- }
- if (b->asn_len != 0)
- snmp_error("ignoring junk at end of binding");
- b->asn_len = trailer;
- return (err);
- }
- /*
- * Parse the different PDUs contents. Any ASN error in the outer components
- * are fatal. Only errors in variable values may be tolerated. If all
- * components can be parsed it returns either ASN_ERR_OK or the first
- * error that was found.
- */
- enum asn_err
- snmp_parse_pdus_hdr(struct asn_buf *b, struct snmp_pdu *pdu, asn_len_t *lenp)
- {
- if (pdu->type == SNMP_PDU_TRAP) {
- if (asn_get_objid(b, &pdu->enterprise) != ASN_ERR_OK) {
- snmp_error("cannot parse trap enterprise");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_ipaddress(b, pdu->agent_addr) != ASN_ERR_OK) {
- snmp_error("cannot parse trap agent address");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_integer(b, &pdu->generic_trap) != ASN_ERR_OK) {
- snmp_error("cannot parse 'generic-trap'");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_integer(b, &pdu->specific_trap) != ASN_ERR_OK) {
- snmp_error("cannot parse 'specific-trap'");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_timeticks(b, &pdu->time_stamp) != ASN_ERR_OK) {
- snmp_error("cannot parse trap 'time-stamp'");
- return (ASN_ERR_FAILED);
- }
- } else {
- if (asn_get_integer(b, &pdu->request_id) != ASN_ERR_OK) {
- snmp_error("cannot parse 'request-id'");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_integer(b, &pdu->error_status) != ASN_ERR_OK) {
- snmp_error("cannot parse 'error_status'");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_integer(b, &pdu->error_index) != ASN_ERR_OK) {
- snmp_error("cannot parse 'error_index'");
- return (ASN_ERR_FAILED);
- }
- }
- if (asn_get_sequence(b, lenp) != ASN_ERR_OK) {
- snmp_error("cannot get varlist header");
- return (ASN_ERR_FAILED);
- }
- return (ASN_ERR_OK);
- }
- static enum asn_err
- parse_pdus(struct asn_buf *b, struct snmp_pdu *pdu, int32_t *ip)
- {
- asn_len_t len, trailer;
- struct snmp_value *v;
- enum asn_err err, err1;
- err = snmp_parse_pdus_hdr(b, pdu, &len);
- if (ASN_ERR_STOPPED(err))
- return (err);
- trailer = b->asn_len - len;
- v = pdu->bindings;
- err = ASN_ERR_OK;
- while (b->asn_len != 0) {
- if (pdu->nbindings == SNMP_MAX_BINDINGS) {
- snmp_error("too many bindings (> %u) in PDU",
- SNMP_MAX_BINDINGS);
- return (ASN_ERR_FAILED);
- }
- err1 = get_var_binding(b, v);
- if (ASN_ERR_STOPPED(err1))
- return (ASN_ERR_FAILED);
- if (err1 != ASN_ERR_OK && err == ASN_ERR_OK) {
- err = err1;
- *ip = pdu->nbindings + 1;
- }
- pdu->nbindings++;
- v++;
- }
- b->asn_len = trailer;
- return (err);
- }
- static enum asn_err
- parse_secparams(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- asn_len_t octs_len;
- u_char buf[256]; /* XXX: calc max possible size here */
- struct asn_buf tb;
- memset(buf, 0, 256);
- tb.asn_ptr = buf;
- tb.asn_len = 256;
- if (asn_get_octetstring(b, buf, &tb.asn_len) != ASN_ERR_OK) {
- snmp_error("cannot parse usm header");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_sequence(&tb, &octs_len) != ASN_ERR_OK) {
- snmp_error("cannot decode usm header");
- return (ASN_ERR_FAILED);
- }
- octs_len = SNMP_ENGINE_ID_SIZ;
- if (asn_get_octetstring(&tb, (u_char *)&pdu->engine.engine_id,
- &octs_len) != ASN_ERR_OK) {
- snmp_error("cannot decode msg engine id");
- return (ASN_ERR_FAILED);
- }
- pdu->engine.engine_len = octs_len;
- if (asn_get_integer(&tb, &pdu->engine.engine_boots) != ASN_ERR_OK) {
- snmp_error("cannot decode msg engine boots");
- return (ASN_ERR_FAILED);
- }
- if (asn_get_integer(&tb, &pdu->engine.engine_time) != ASN_ERR_OK) {
- snmp_error("cannot decode msg engine time");
- return (ASN_ERR_FAILED);
- }
- octs_len = SNMP_ADM_STR32_SIZ - 1;
- if (asn_get_octetstring(&tb, (u_char *)&pdu->user.sec_name, &octs_len)
- != ASN_ERR_OK) {
- snmp_error("cannot decode msg user name");
- return (ASN_ERR_FAILED);
- }
- pdu->user.sec_name[octs_len] = '\0';
- octs_len = sizeof(pdu->msg_digest);
- if (asn_get_octetstring(&tb, (u_char *)&pdu->msg_digest, &octs_len) !=
- ASN_ERR_OK || ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0 &&
- octs_len != sizeof(pdu->msg_digest))) {
- snmp_error("cannot decode msg authentication param");
- return (ASN_ERR_FAILED);
- }
- octs_len = sizeof(pdu->msg_salt);
- if (asn_get_octetstring(&tb, (u_char *)&pdu->msg_salt, &octs_len) !=
- ASN_ERR_OK ||((pdu->flags & SNMP_MSG_PRIV_FLAG) != 0 &&
- octs_len != sizeof(pdu->msg_salt))) {
- snmp_error("cannot decode msg authentication param");
- return (ASN_ERR_FAILED);
- }
- if ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0) {
- pdu->digest_ptr = b->asn_ptr - SNMP_USM_AUTH_SIZE;
- pdu->digest_ptr -= octs_len + ASN_MAXLENLEN;
- }
- return (ASN_ERR_OK);
- }
- static enum snmp_code
- pdu_encode_secparams(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- u_char buf[256], *sptr;
- struct asn_buf tb;
- size_t auth_off, moved = 0;
- auth_off = 0;
- memset(buf, 0, 256);
- tb.asn_ptr = buf;
- tb.asn_len = 256;
- if (asn_put_temp_header(&tb, (ASN_TYPE_SEQUENCE|ASN_TYPE_CONSTRUCTED),
- &sptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_octetstring(&tb, (u_char *)pdu->engine.engine_id,
- pdu->engine.engine_len) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_integer(&tb, pdu->engine.engine_boots) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_integer(&tb, pdu->engine.engine_time) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_octetstring(&tb, (u_char *)pdu->user.sec_name,
- strlen(pdu->user.sec_name)) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0) {
- auth_off = sizeof(buf) - tb.asn_len + ASN_MAXLENLEN;
- if (asn_put_octetstring(&tb, (u_char *)pdu->msg_digest,
- sizeof(pdu->msg_digest)) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- } else {
- if (asn_put_octetstring(&tb, (u_char *)pdu->msg_digest, 0)
- != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- }
- if ((pdu->flags & SNMP_MSG_PRIV_FLAG) != 0) {
- if (asn_put_octetstring(&tb, (u_char *)pdu->msg_salt,
- sizeof(pdu->msg_salt)) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- } else {
- if (asn_put_octetstring(&tb, (u_char *)pdu->msg_salt, 0)
- != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- }
- if (asn_commit_header(&tb, sptr, &moved) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0)
- pdu->digest_ptr = b->asn_ptr + auth_off - moved;
- if (asn_put_octetstring(b, buf, sizeof(buf) - tb.asn_len) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- pdu->digest_ptr += ASN_MAXLENLEN;
- if ((pdu->flags & SNMP_MSG_PRIV_FLAG) != 0 && asn_put_temp_header(b,
- ASN_TYPE_OCTETSTRING, &pdu->encrypted_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- return (SNMP_CODE_OK);
- }
- /*
- * Decode the PDU except for the variable bindings itself.
- * If decoding fails because of a bad binding, but the rest can be
- * decoded, ip points to the index of the failed variable (errors
- * OORANGE, BADLEN or BADVERS).
- */
- enum snmp_code
- snmp_pdu_decode(struct asn_buf *b, struct snmp_pdu *pdu, int32_t *ip)
- {
- enum snmp_code code;
- if ((code = snmp_pdu_decode_header(b, pdu)) != SNMP_CODE_OK)
- return (code);
- if (pdu->version == SNMP_V3) {
- if (pdu->security_model != SNMP_SECMODEL_USM)
- return (SNMP_CODE_FAILED);
- if ((code = snmp_pdu_decode_secmode(b, pdu)) != SNMP_CODE_OK)
- return (code);
- }
- code = snmp_pdu_decode_scoped(b, pdu, ip);
- switch (code) {
- case SNMP_CODE_FAILED:
- snmp_pdu_free(pdu);
- break;
- case SNMP_CODE_BADENC:
- if (pdu->version == SNMP_Verr)
- return (SNMP_CODE_BADVERS);
- default:
- break;
- }
- return (code);
- }
- enum snmp_code
- snmp_pdu_decode_header(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- int32_t version;
- u_int octs_len;
- asn_len_t len;
- pdu->outer_ptr = b->asn_ptr;
- pdu->outer_len = b->asn_len;
- if (asn_get_sequence(b, &len) != ASN_ERR_OK) {
- snmp_error("cannot decode pdu header");
- return (SNMP_CODE_FAILED);
- }
- if (b->asn_len < len) {
- snmp_error("outer sequence value too short");
- return (SNMP_CODE_FAILED);
- }
- if (b->asn_len != len) {
- snmp_error("ignoring trailing junk in message");
- b->asn_len = len;
- }
- if (asn_get_integer(b, &version) != ASN_ERR_OK) {
- snmp_error("cannot decode version");
- return (SNMP_CODE_FAILED);
- }
- if (version == 0)
- pdu->version = SNMP_V1;
- else if (version == 1)
- pdu->version = SNMP_V2c;
- else if (version == 3)
- pdu->version = SNMP_V3;
- else {
- pdu->version = SNMP_Verr;
- snmp_error("unsupported SNMP version");
- return (SNMP_CODE_BADENC);
- }
- if (pdu->version == SNMP_V3) {
- if (asn_get_sequence(b, &len) != ASN_ERR_OK) {
- snmp_error("cannot decode pdu global data header");
- return (SNMP_CODE_FAILED);
- }
- if (asn_get_integer(b, &pdu->identifier) != ASN_ERR_OK) {
- snmp_error("cannot decode msg indetifier");
- return (SNMP_CODE_FAILED);
- }
- if (asn_get_integer(b, &pdu->engine.max_msg_size)
- != ASN_ERR_OK) {
- snmp_error("cannot decode msg size");
- return (SNMP_CODE_FAILED);
- }
- octs_len = 1;
- if (asn_get_octetstring(b, (u_char *)&pdu->flags,
- &octs_len) != ASN_ERR_OK) {
- snmp_error("cannot decode msg flags");
- return (SNMP_CODE_FAILED);
- }
- if (asn_get_integer(b, &pdu->security_model) != ASN_ERR_OK) {
- snmp_error("cannot decode msg size");
- return (SNMP_CODE_FAILED);
- }
- if (pdu->security_model != SNMP_SECMODEL_USM)
- return (SNMP_CODE_FAILED);
- if (parse_secparams(b, pdu) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- } else {
- octs_len = SNMP_COMMUNITY_MAXLEN;
- if (asn_get_octetstring(b, (u_char *)pdu->community,
- &octs_len) != ASN_ERR_OK) {
- snmp_error("cannot decode community");
- return (SNMP_CODE_FAILED);
- }
- pdu->community[octs_len] = '\0';
- }
- return (SNMP_CODE_OK);
- }
- enum snmp_code
- snmp_pdu_decode_scoped(struct asn_buf *b, struct snmp_pdu *pdu, int32_t *ip)
- {
- u_char type;
- asn_len_t len, trailer;
- enum asn_err err;
- if (pdu->version == SNMP_V3) {
- if (asn_get_sequence(b, &len) != ASN_ERR_OK) {
- snmp_error("cannot decode scoped pdu header");
- return (SNMP_CODE_FAILED);
- }
- len = SNMP_ENGINE_ID_SIZ;
- if (asn_get_octetstring(b, (u_char *)&pdu->context_engine,
- &len) != ASN_ERR_OK) {
- snmp_error("cannot decode msg context engine");
- return (SNMP_CODE_FAILED);
- }
- pdu->context_engine_len = len;
- len = SNMP_CONTEXT_NAME_SIZ;
- if (asn_get_octetstring(b, (u_char *)&pdu->context_name,
- &len) != ASN_ERR_OK) {
- snmp_error("cannot decode msg context name");
- return (SNMP_CODE_FAILED);
- }
- pdu->context_name[len] = '\0';
- }
- if (asn_get_header(b, &type, &len) != ASN_ERR_OK) {
- snmp_error("cannot get pdu header");
- return (SNMP_CODE_FAILED);
- }
- if ((type & ~ASN_TYPE_MASK) !=
- (ASN_TYPE_CONSTRUCTED | ASN_CLASS_CONTEXT)) {
- snmp_error("bad pdu header tag");
- return (SNMP_CODE_FAILED);
- }
- pdu->type = type & ASN_TYPE_MASK;
- switch (pdu->type) {
- case SNMP_PDU_GET:
- case SNMP_PDU_GETNEXT:
- case SNMP_PDU_RESPONSE:
- case SNMP_PDU_SET:
- break;
- case SNMP_PDU_TRAP:
- if (pdu->version != SNMP_V1) {
- snmp_error("bad pdu type %u", pdu->type);
- return (SNMP_CODE_FAILED);
- }
- break;
- case SNMP_PDU_GETBULK:
- case SNMP_PDU_INFORM:
- case SNMP_PDU_TRAP2:
- case SNMP_PDU_REPORT:
- if (pdu->version == SNMP_V1) {
- snmp_error("bad pdu type %u", pdu->type);
- return (SNMP_CODE_FAILED);
- }
- break;
- default:
- snmp_error("bad pdu type %u", pdu->type);
- return (SNMP_CODE_FAILED);
- }
- trailer = b->asn_len - len;
- b->asn_len = len;
- err = parse_pdus(b, pdu, ip);
- if (ASN_ERR_STOPPED(err))
- return (SNMP_CODE_FAILED);
- if (b->asn_len != 0)
- snmp_error("ignoring trailing junk after pdu");
- b->asn_len = trailer;
- return (SNMP_CODE_OK);
- }
- enum snmp_code
- snmp_pdu_decode_secmode(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- u_char type;
- enum snmp_code code;
- uint8_t digest[SNMP_USM_AUTH_SIZE];
- if (pdu->user.auth_proto != SNMP_AUTH_NOAUTH &&
- (pdu->flags & SNMP_MSG_AUTH_FLAG) == 0)
- return (SNMP_CODE_BADSECLEVEL);
- if ((code = snmp_pdu_calc_digest(pdu, digest)) !=
- SNMP_CODE_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->user.auth_proto != SNMP_AUTH_NOAUTH &&
- memcmp(digest, pdu->msg_digest, sizeof(pdu->msg_digest)) != 0)
- return (SNMP_CODE_BADDIGEST);
- if (pdu->user.priv_proto != SNMP_PRIV_NOPRIV && (asn_get_header(b, &type,
- &pdu->scoped_len) != ASN_ERR_OK || type != ASN_TYPE_OCTETSTRING)) {
- snmp_error("cannot decode encrypted pdu");
- return (SNMP_CODE_FAILED);
- }
- pdu->scoped_ptr = b->asn_ptr;
- if (pdu->user.priv_proto != SNMP_PRIV_NOPRIV &&
- (pdu->flags & SNMP_MSG_PRIV_FLAG) == 0)
- return (SNMP_CODE_BADSECLEVEL);
- if ((code = snmp_pdu_decrypt(pdu)) != SNMP_CODE_OK)
- return (SNMP_CODE_FAILED);
- return (code);
- }
- /*
- * Check whether what we have is the complete PDU by snooping at the
- * enclosing structure header. This returns:
- * -1 if there are ASN.1 errors
- * 0 if we need more data
- * > 0 the length of this PDU
- */
- int
- snmp_pdu_snoop(const struct asn_buf *b0)
- {
- u_int length;
- asn_len_t len;
- struct asn_buf b = *b0;
- /* <0x10|0x20> <len> <data...> */
-
- if (b.asn_len == 0)
- return (0);
- if (b.asn_cptr[0] != (ASN_TYPE_SEQUENCE | ASN_TYPE_CONSTRUCTED)) {
- asn_error(&b, "bad sequence type %u", b.asn_cptr[0]);
- return (-1);
- }
- b.asn_len--;
- b.asn_cptr++;
- if (b.asn_len == 0)
- return (0);
- if (*b.asn_cptr & 0x80) {
- /* long length */
- length = *b.asn_cptr++ & 0x7f;
- b.asn_len--;
- if (length == 0) {
- asn_error(&b, "indefinite length not supported");
- return (-1);
- }
- if (length > ASN_MAXLENLEN) {
- asn_error(&b, "long length too long (%u)", length);
- return (-1);
- }
- if (length > b.asn_len)
- return (0);
- len = 0;
- while (length--) {
- len = (len << 8) | *b.asn_cptr++;
- b.asn_len--;
- }
- } else {
- len = *b.asn_cptr++;
- b.asn_len--;
- }
- if (len > b.asn_len)
- return (0);
- return (len + b.asn_cptr - b0->asn_cptr);
- }
- /*
- * Encode the SNMP PDU without the variable bindings field.
- * We do this the rather uneffective way by
- * moving things around and assuming that the length field will never
- * use more than 2 bytes.
- * We need a number of pointers to apply the fixes afterwards.
- */
- enum snmp_code
- snmp_pdu_encode_header(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- enum asn_err err;
- u_char *v3_hdr_ptr;
- if (asn_put_temp_header(b, (ASN_TYPE_SEQUENCE|ASN_TYPE_CONSTRUCTED),
- &pdu->outer_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->version == SNMP_V1)
- err = asn_put_integer(b, 0);
- else if (pdu->version == SNMP_V2c)
- err = asn_put_integer(b, 1);
- else if (pdu->version == SNMP_V3)
- err = asn_put_integer(b, 3);
- else
- return (SNMP_CODE_BADVERS);
- if (err != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->version == SNMP_V3) {
- if (asn_put_temp_header(b, (ASN_TYPE_SEQUENCE |
- ASN_TYPE_CONSTRUCTED), &v3_hdr_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
-
- if (asn_put_integer(b, pdu->identifier) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_integer(b, pdu->engine.max_msg_size) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->type != SNMP_PDU_RESPONSE &&
- pdu->type != SNMP_PDU_TRAP &&
- pdu->type != SNMP_PDU_TRAP2 &&
- pdu->type != SNMP_PDU_REPORT)
- pdu->flags |= SNMP_MSG_REPORT_FLAG;
- if (asn_put_octetstring(b, (u_char *)&pdu->flags, 1)
- != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_integer(b, pdu->security_model) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_commit_header(b, v3_hdr_ptr, NULL) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->security_model != SNMP_SECMODEL_USM)
- return (SNMP_CODE_FAILED);
- if (pdu_encode_secparams(b, pdu) != SNMP_CODE_OK)
- return (SNMP_CODE_FAILED);
- /* View-based Access Conntrol information */
- if (asn_put_temp_header(b, (ASN_TYPE_SEQUENCE |
- ASN_TYPE_CONSTRUCTED), &pdu->scoped_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_octetstring(b, (u_char *)pdu->context_engine,
- pdu->context_engine_len) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (asn_put_octetstring(b, (u_char *)pdu->context_name,
- strlen(pdu->context_name)) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- } else {
- if (asn_put_octetstring(b, (u_char *)pdu->community,
- strlen(pdu->community)) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- }
- if (asn_put_temp_header(b, (ASN_TYPE_CONSTRUCTED | ASN_CLASS_CONTEXT |
- pdu->type), &pdu->pdu_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->type == SNMP_PDU_TRAP) {
- if (pdu->version != SNMP_V1 ||
- asn_put_objid(b, &pdu->enterprise) != ASN_ERR_OK ||
- asn_put_ipaddress(b, pdu->agent_addr) != ASN_ERR_OK ||
- asn_put_integer(b, pdu->generic_trap) != ASN_ERR_OK ||
- asn_put_integer(b, pdu->specific_trap) != ASN_ERR_OK ||
- asn_put_timeticks(b, pdu->time_stamp) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- } else {
- if (pdu->version == SNMP_V1 && (pdu->type == SNMP_PDU_GETBULK ||
- pdu->type == SNMP_PDU_INFORM ||
- pdu->type == SNMP_PDU_TRAP2 ||
- pdu->type == SNMP_PDU_REPORT))
- return (SNMP_CODE_FAILED);
- if (asn_put_integer(b, pdu->request_id) != ASN_ERR_OK ||
- asn_put_integer(b, pdu->error_status) != ASN_ERR_OK ||
- asn_put_integer(b, pdu->error_index) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- }
- if (asn_put_temp_header(b, (ASN_TYPE_SEQUENCE|ASN_TYPE_CONSTRUCTED),
- &pdu->vars_ptr) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- return (SNMP_CODE_OK);
- }
- static enum asn_err
- snmp_pdu_fix_padd(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- asn_len_t padlen;
- if (pdu->user.priv_proto == SNMP_PRIV_DES && pdu->scoped_len % 8 != 0) {
- padlen = 8 - (pdu->scoped_len % 8);
- if (asn_pad(b, padlen) != ASN_ERR_OK)
- return (ASN_ERR_FAILED);
- pdu->scoped_len += padlen;
- }
- return (ASN_ERR_OK);
- }
- enum snmp_code
- snmp_fix_encoding(struct asn_buf *b, struct snmp_pdu *pdu)
- {
- size_t moved = 0;
- enum snmp_code code;
- if (asn_commit_header(b, pdu->vars_ptr, NULL) != ASN_ERR_OK ||
- asn_commit_header(b, pdu->pdu_ptr, NULL) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->version == SNMP_V3) {
- if (asn_commit_header(b, pdu->scoped_ptr, NULL) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- pdu->scoped_len = b->asn_ptr - pdu->scoped_ptr;
- if ((code = snmp_pdu_fix_padd(b, pdu))!= ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->security_model != SNMP_SECMODEL_USM)
- return (SNMP_CODE_FAILED);
- if (snmp_pdu_encrypt(pdu) != SNMP_CODE_OK)
- return (SNMP_CODE_FAILED);
- if (pdu->user.priv_proto != SNMP_PRIV_NOPRIV &&
- asn_commit_header(b, pdu->encrypted_ptr, NULL) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- }
- if (asn_commit_header(b, pdu->outer_ptr, &moved) != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- pdu->outer_len = b->asn_ptr - pdu->outer_ptr;
- pdu->digest_ptr -= moved;
- if (pdu->version == SNMP_V3) {
- if ((code = snmp_pdu_calc_digest(pdu, pdu->msg_digest)) !=
- SNMP_CODE_OK)
- return (SNMP_CODE_FAILED);
- if ((pdu->flags & SNMP_MSG_AUTH_FLAG) != 0)
- memcpy(pdu->digest_ptr, pdu->msg_digest,
- sizeof(pdu->msg_digest));
- }
- return (SNMP_CODE_OK);
- }
- /*
- * Encode a binding. Caller must ensure, that the syntax is ok for that version.
- * Be sure not to cobber b, when something fails.
- */
- enum asn_err
- snmp_binding_encode(struct asn_buf *b, const struct snmp_value *binding)
- {
- u_char *ptr;
- enum asn_err err;
- struct asn_buf save = *b;
- if ((err = asn_put_temp_header(b, (ASN_TYPE_SEQUENCE |
- ASN_TYPE_CONSTRUCTED), &ptr)) != ASN_ERR_OK) {
- *b = save;
- return (err);
- }
- if ((err = asn_put_objid(b, &binding->var)) != ASN_ERR_OK) {
- *b = save;
- return (err);
- }
- switch (binding->syntax) {
- case SNMP_SYNTAX_NULL:
- err = asn_put_null(b);
- break;
- case SNMP_SYNTAX_INTEGER:
- err = asn_put_integer(b, binding->v.integer);
- break;
- case SNMP_SYNTAX_OCTETSTRING:
- err = asn_put_octetstring(b, binding->v.octetstring.octets,
- binding->v.octetstring.len);
- break;
- case SNMP_SYNTAX_OID:
- err = asn_put_objid(b, &binding->v.oid);
- break;
- case SNMP_SYNTAX_IPADDRESS:
- err = asn_put_ipaddress(b, binding->v.ipaddress);
- break;
- case SNMP_SYNTAX_TIMETICKS:
- err = asn_put_uint32(b, ASN_APP_TIMETICKS, binding->v.uint32);
- break;
- case SNMP_SYNTAX_COUNTER:
- err = asn_put_uint32(b, ASN_APP_COUNTER, binding->v.uint32);
- break;
- case SNMP_SYNTAX_GAUGE:
- err = asn_put_uint32(b, ASN_APP_GAUGE, binding->v.uint32);
- break;
- case SNMP_SYNTAX_COUNTER64:
- err = asn_put_counter64(b, binding->v.counter64);
- break;
- case SNMP_SYNTAX_NOSUCHOBJECT:
- err = asn_put_exception(b, ASN_EXCEPT_NOSUCHOBJECT);
- break;
- case SNMP_SYNTAX_NOSUCHINSTANCE:
- err = asn_put_exception(b, ASN_EXCEPT_NOSUCHINSTANCE);
- break;
- case SNMP_SYNTAX_ENDOFMIBVIEW:
- err = asn_put_exception(b, ASN_EXCEPT_ENDOFMIBVIEW);
- break;
- }
- if (err != ASN_ERR_OK) {
- *b = save;
- return (err);
- }
- err = asn_commit_header(b, ptr, NULL);
- if (err != ASN_ERR_OK) {
- *b = save;
- return (err);
- }
- return (ASN_ERR_OK);
- }
- /*
- * Encode an PDU.
- */
- enum snmp_code
- snmp_pdu_encode(struct snmp_pdu *pdu, struct asn_buf *resp_b)
- {
- u_int idx;
- enum snmp_code err;
- if ((err = snmp_pdu_encode_header(resp_b, pdu)) != SNMP_CODE_OK)
- return (err);
- for (idx = 0; idx < pdu->nbindings; idx++)
- if ((err = snmp_binding_encode(resp_b, &pdu->bindings[idx]))
- != ASN_ERR_OK)
- return (SNMP_CODE_FAILED);
- return (snmp_fix_encoding(resp_b, pdu));
- }
- static void
- dump_binding(const struct snmp_value *b)
- {
- u_int i;
- char buf[ASN_OIDSTRLEN];
- snmp_printf("%s=", asn_oid2str_r(&b->var, buf));
- switch (b->syntax) {
- case SNMP_SYNTAX_NULL:
- snmp_printf("NULL");
- break;
- case SNMP_SYNTAX_INTEGER:
- snmp_printf("INTEGER %d", b->v.integer);
- break;
- case SNMP_SYNTAX_OCTETSTRING:
- snmp_printf("OCTET STRING %lu:", b->v.octetstring.len);
- for (i = 0; i < b->v.octetstring.len; i++)
- snmp_printf(" %02x", b->v.octetstring.octets[i]);
- break;
- case SNMP_SYNTAX_OID:
- snmp_printf("OID %s", asn_oid2str_r(&b->v.oid, buf));
- break;
- case SNMP_SYNTAX_IPADDRESS:
- snmp_printf("IPADDRESS %u.%u.%u.%u", b->v.ipaddress[0],
- b->v.ipaddress[1], b->v.ipaddress[2], b->v.ipaddress[3]);
- break;
- case SNMP_SYNTAX_COUNTER:
- snmp_printf("COUNTER %u", b->v.uint32);
- break;
- case SNMP_SYNTAX_GAUGE:
- snmp_printf("GAUGE %u", b->v.uint32);
- break;
- case SNMP_SYNTAX_TIMETICKS:
- snmp_printf("TIMETICKS %u", b->v.uint32);
- break;
- case SNMP_SYNTAX_COUNTER64:
- snmp_printf("COUNTER64 %lld", b->v.counter64);
- break;
- case SNMP_SYNTAX_NOSUCHOBJECT:
- snmp_printf("NoSuchObject");
- break;
- case SNMP_SYNTAX_NOSUCHINSTANCE:
- snmp_printf("NoSuchInstance");
- break;
- case SNMP_SYNTAX_ENDOFMIBVIEW:
- snmp_printf("EndOfMibView");
- break;
- default:
- snmp_printf("UNKNOWN SYNTAX %u", b->syntax);
- break;
- }
- }
- static __inline void
- dump_bindings(const struct snmp_pdu *pdu)
- {
- u_int i;
- for (i = 0; i < pdu->nbindings; i++) {
- snmp_printf(" [%u]: ", i);
- dump_binding(&pdu->bindings[i]);
- snmp_printf("\n");
- }
- }
- static __inline void
- dump_notrap(const struct snmp_pdu *pdu)
- {
- snmp_printf(" request_id=%d", pdu->request_id);
- snmp_printf(" error_status=%d", pdu->error_status);
- snmp_printf(" error_index=%d\n", pdu->error_index);
- dump_bindings(pdu);
- }
- void
- snmp_pdu_dump(const struct snmp_pdu *pdu)
- {
- char buf[ASN_OIDSTRLEN];
- const char *vers;
- static const char *types[] = {
- [SNMP_PDU_GET] = "GET",
- [SNMP_PDU_GETNEXT] = "GETNEXT",
- [SNMP_PDU_RESPONSE] = "RESPONSE",
- [SNMP_PDU_SET] = "SET",
- [SNMP_PDU_TRAP] = "TRAPv1",
- [SNMP_PDU_GETBULK] = "GETBULK",
- [SNMP_PDU_INFORM] = "INFORM",
- [SNMP_PDU_TRAP2] = "TRAPv2",
- [SNMP_PDU_REPORT] = "REPORT",
- };
- if (pdu->version == SNMP_V1)
- vers = "SNMPv1";
- else if (pdu->version == SNMP_V2c)
- vers = "SNMPv2c";
- else if (pdu->version == SNMP_V3)
- vers = "SNMPv3";
- else
- vers = "v?";
- switch (pdu->type) {
- case SNMP_PDU_TRAP:
- snmp_printf("%s %s '%s'", types[pdu->type], vers, pdu->community);
- snmp_printf(" enterprise=%s", asn_oid2str_r(&pdu->enterprise, buf));
- snmp_printf(" agent_addr=%u.%u.%u.%u", pdu->agent_addr[0],
- pdu->agent_addr[1], pdu->agent_addr[2], pdu->agent_addr[3]);
- snmp_printf(" generic_trap=%d", pdu->generic_trap);
- snmp_printf(" specific_trap=%d", pdu->specific_trap);
- snmp_printf(" time-stamp=%u\n", pdu->time_stamp);
- dump_bindings(pdu);
- break;
- case SNMP_PDU_GET:
- case SNMP_PDU_GETNEXT:
- case SNMP_PDU_RESPONSE:
- case SNMP_PDU_SET:
- case SNMP_PDU_GETBULK:
- case SNMP_PDU_INFORM:
- case SNMP_PDU_TRAP2:
- case SNMP_PDU_REPORT:
- snmp_printf("%s %s '%s'", types[pdu->type], vers, pdu->community);
- dump_notrap(pdu);
- break;
- default:
- snmp_printf("bad pdu type %u\n", pdu->type);
- break;
- }
- }
- void
- snmp_value_free(struct snmp_value *value)
- {
- if (value->syntax == SNMP_SYNTAX_OCTETSTRING)
- free(value->v.octetstring.octets);
- value->syntax = SNMP_SYNTAX_NULL;
- }
- int
- snmp_value_copy(struct snmp_value *to, const struct snmp_value *from)
- {
- to->var = from->var;
- to->syntax = from->syntax;
- if (from->syntax == SNMP_SYNTAX_OCTETSTRING) {
- if ((to->v.octetstring.len = from->v.octetstring.len) == 0)
- to->v.octetstring.octets = NULL;
- else {
- to->v.octetstring.octets = malloc(to->v.octetstring.len);
- if (to->v.octetstring.octets == NULL)
- return (-1);
- (void)memcpy(to->v.octetstring.octets,
- from->v.octetstring.octets, to->v.octetstring.len);
- }
- } else
- to->v = from->v;
- return (0);
- }
- void
- snmp_pdu_init_secparams(struct snmp_pdu *pdu)
- {
- int32_t rval;
- if (pdu->user.auth_proto != SNMP_AUTH_NOAUTH)
- pdu->flags |= SNMP_MSG_AUTH_FLAG;
- switch (pdu->user.priv_proto) {
- case SNMP_PRIV_DES:
- memcpy(pdu->msg_salt, &pdu->engine.engine_boots,
- sizeof(pdu->engine.engine_boots));
- rval = random();
- memcpy(pdu->msg_salt + sizeof(pdu->engine.engine_boots), &rval,
- sizeof(int32_t));
- pdu->flags |= SNMP_MSG_PRIV_FLAG;
- break;
- case SNMP_PRIV_AES:
- rval = random();
- memcpy(pdu->msg_salt, &rval, sizeof(int32_t));
- rval = random();
- memcpy(pdu->msg_salt + sizeof(int32_t), &rval, sizeof(int32_t));
- pdu->flags |= SNMP_MSG_PRIV_FLAG;
- break;
- default:
- break;
- }
- }
- void
- snmp_pdu_free(struct snmp_pdu *pdu)
- {
- u_int i;
- for (i = 0; i < pdu->nbindings; i++)
- snmp_value_free(&pdu->bindings[i]);
- }
- /*
- * Parse an ASCII SNMP value into the binary form
- */
- int
- snmp_value_parse(const char *str, enum snmp_syntax syntax, union snmp_values *v)
- {
- char *end;
- switch (syntax) {
- case SNMP_SYNTAX_NULL:
- case SNMP_SYNTAX_NOSUCHOBJECT:
- case SNMP_SYNTAX_NOSUCHINSTANCE:
- case SNMP_SYNTAX_ENDOFMIBVIEW:
- if (*str != '\0')
- return (-1);
- return (0);
- case SNMP_SYNTAX_INTEGER:
- v->integer = strtoll(str, &end, 0);
- if (*end != '\0')
- return (-1);
- return (0);
- case SNMP_SYNTAX_OCTETSTRING:
- {
- u_long len; /* actual length of string */
- u_long alloc; /* allocate length of string */
- u_char *octs; /* actual octets */
- u_long oct; /* actual octet */
- u_char *nocts; /* to avoid memory leak */
- u_char c; /* actual character */
- # define STUFFC(C) \
- if (alloc == len) { \
- alloc += 100; \
- if ((nocts = realloc(octs, alloc)) == NULL) { \
- free(octs); \
- return (-1); \
- } \
- octs = nocts; \
- } \
- octs[len++] = (C);
- len = alloc = 0;
- octs = NULL;
- if (*str == '"') {
- str++;
- while((c = *str++) != '\0') {
- if (c == '"') {
- if (*str != '\0') {
- free(octs);
- return (-1);
- }
- break;
- }
- if (c == '\\') {
- switch (c = *str++) {
- case '\\':
- break;
- case 'a':
- c = '\a';
- break;
- case 'b':
- c = '\b';
- break;
- case 'f':
- c = '\f';
- break;
- case 'n':
- c = '\n';
- break;
- case 'r':
- c = '\r';
- break;
- case 't':
- c = '\t';
- break;
- case 'v':
- c = '\v';
- break;
- case 'x':
- c = 0;
- if (!isxdigit(*str))
- break;
- if (isdigit(*str))
- c = *str++ - '0';
- else if (isupper(*str))
- c = *str++ - 'A' + 10;
- else
- c = *str++ - 'a' + 10;
- if (!isxdigit(*str))
- break;
- if (isdigit(*str))
- c += *str++ - '0';
- else if (isupper(*str))
- c += *str++ - 'A' + 10;
- else
- c += *str++ - 'a' + 10;
- break;
- case '0': case '1': case '2':
- case '3': case '4': case '5':
- case '6': case '7':
- c = *str++ - '0';
- if (*str < '0' || *str > '7')
- break;
- c = *str++ - '0';
- if (*str < '0' || *str > '7')
- break;
- c = *str++ - '0';
- break;
- default:
- break;
- }
- }
- STUFFC(c);
- }
- } else {
- while (*str != '\0') {
- oct = strtoul(str, &end, 16);
- str = end;
- if (oct > 0xff) {
- free(octs);
- return (-1);
- }
- STUFFC(oct);
- if (*str == ':')
- str++;
- else if(*str != '\0') {
- free(octs);
- return (-1);
- }
- }
- }
- v->octetstring.octets = octs;
- v->octetstring.len = len;
- return (0);
- # undef STUFFC
- }
- case SNMP_SYNTAX_OID:
- {
- u_long subid;
- v->oid.len = 0;
- for (;;) {
- if (v->oid.len == ASN_MAXOIDLEN)
- return (-1);
- subid = strtoul(str, &end, 10);
- str = end;
- if (subid > ASN_MAXID)
- return (-1);
- v->oid.subs[v->oid.len++] = (asn_subid_t)subid;
- if (*str == '\0')
- break;
- if (*str != '.')
- return (-1);
- str++;
- }
- return (0);
- }
- case SNMP_SYNTAX_IPADDRESS:
- {
- struct hostent *he;
- u_long ip[4];
- int n;
- if (sscanf(str, "%lu.%lu.%lu.%lu%n", &ip[0], &ip[1], &ip[2],
- &ip[3], &n) == 4 && (size_t)n == strlen(str) &&
- ip[0] <= 0xff && ip[1] <= 0xff &&
- ip[2] <= 0xff && ip[3] <= 0xff) {
- v->ipaddress[0] = (u_char)ip[0];
- v->ipaddress[1] = (u_char)ip[1];
- v->ipaddress[2] = (u_char)ip[2];
- v->ipaddress[3] = (u_char)ip[3];
- return (0);
- }
- if ((he = gethostbyname(str)) == NULL)
- return (-1);
- if (he->h_addrtype != AF_INET)
- return (-1);
- v->ipaddress[0] = he->h_addr[0];
- v->ipaddress[1] = he->h_addr[1];
- v->ipaddress[2] = he->h_addr[2];
- v->ipaddress[3] = he->h_addr[3];
- return (0);
- }
- case SNMP_SYNTAX_COUNTER:
- case SNMP_SYNTAX_GAUGE:
- case SNMP_SYNTAX_TIMETICKS:
- {
- uint64_t sub;
- sub = strtoull(str, &end, 0);
- if (*end != '\0' || sub > 0xffffffff)
- return (-1);
- v->uint32 = (uint32_t)sub;
- return (0);
- }
- case SNMP_SYNTAX_COUNTER64:
- v->counter64 = strtoull(str, &end, 0);
- if (*end != '\0')
- return (-1);
- return (0);
- }
- abort();
- }
- static void
- snmp_error_func(const char *fmt, ...)
- {
- va_list ap;
- va_start(ap, fmt);
- fprintf(stderr, "SNMP: ");
- vfprintf(stderr, fmt, ap);
- fprintf(stderr, "\n");
- va_end(ap);
- }
- static void
- snmp_printf_func(const char *fmt, ...)
- {
- va_list ap;
- va_start(ap, fmt);
- vfprintf(stderr, fmt, ap);
- va_end(ap);
- }