diff options
Diffstat (limited to 'src/bsnmp/snmp.c')
| -rw-r--r-- | src/bsnmp/snmp.c | 1081 |
1 files changed, 1081 insertions, 0 deletions
diff --git a/src/bsnmp/snmp.c b/src/bsnmp/snmp.c new file mode 100644 index 0000000..f758262 --- /dev/null +++ b/src/bsnmp/snmp.c @@ -0,0 +1,1081 @@ +/* + * Copyright (c) 2001-2003 + * Fraunhofer Institute for Open Communication Systems (FhG Fokus). + * All rights reserved. + * + * Author: Harti Brandt <harti@freebsd.org> + * + * 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 1.38 2004/08/06 08:46:53 brandt Exp $ + * + * SNMP + */ +#include <sys/types.h> +#include <sys/socket.h> +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <stdarg.h> +#include <stdint.h> +#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); +} + +/* + * Parse the outer SEQUENCE value. ASN_ERR_TAG means 'bad version'. + */ +enum asn_err +snmp_parse_message_hdr(struct asn_buf *b, struct snmp_pdu *pdu, asn_len_t *lenp) +{ + int32_t version; + u_char type; + u_int comm_len; + + if (asn_get_integer(b, &version) != ASN_ERR_OK) { + snmp_error("cannot decode version"); + return (ASN_ERR_FAILED); + } + + if (version == 0) { + pdu->version = SNMP_V1; + } else if (version == 1) { + pdu->version = SNMP_V2c; + } else { + pdu->version = SNMP_Verr; + snmp_error("unsupported SNMP version"); + return (ASN_ERR_TAG); + } + + comm_len = SNMP_COMMUNITY_MAXLEN; + if (asn_get_octetstring(b, (u_char *)pdu->community, + &comm_len) != ASN_ERR_OK) { + snmp_error("cannot decode community"); + return (ASN_ERR_FAILED); + } + pdu->community[comm_len] = '\0'; + + if (asn_get_header(b, &type, lenp) != ASN_ERR_OK) { + snmp_error("cannot get pdu header"); + return (ASN_ERR_FAILED); + } + if ((type & ~ASN_TYPE_MASK) != + (ASN_TYPE_CONSTRUCTED | ASN_CLASS_CONTEXT)) { + snmp_error("bad pdu header tag"); + return (ASN_ERR_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 (ASN_ERR_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 (ASN_ERR_FAILED); + } + break; + + default: + snmp_error("bad pdu type %u", pdu->type); + return (ASN_ERR_FAILED); + } + + + if (*lenp > b->asn_len) { + snmp_error("pdu length too long"); + return (ASN_ERR_FAILED); + } + + return (ASN_ERR_OK); +} + +static enum asn_err +parse_message(struct asn_buf *b, struct snmp_pdu *pdu, int32_t *ip) +{ + enum asn_err err; + asn_len_t len, trailer; + + err = snmp_parse_message_hdr(b, pdu, &len); + if (ASN_ERR_STOPPED(err)) + return (err); + + trailer = b->asn_len - len; + b->asn_len = len; + + err = parse_pdus(b, pdu, ip); + if (ASN_ERR_STOPPED(err)) + return (ASN_ERR_FAILED); + + if (b->asn_len != 0) + snmp_error("ignoring trailing junk after pdu"); + + b->asn_len = trailer; + + return (err); +} + +/* + * 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) +{ + asn_len_t len; + + memset(pdu, 0, sizeof(*pdu)); + + 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; + } + + switch (parse_message(b, pdu, ip)) { + + case ASN_ERR_OK: + return (SNMP_CODE_OK); + + case ASN_ERR_FAILED: + case ASN_ERR_EOBUF: + snmp_pdu_free(pdu); + return (SNMP_CODE_FAILED); + + case ASN_ERR_BADLEN: + return (SNMP_CODE_BADLEN); + + case ASN_ERR_RANGE: + return (SNMP_CODE_OORANGE); + + case ASN_ERR_TAG: + if (pdu->version == SNMP_Verr) + return (SNMP_CODE_BADVERS); + else + return (SNMP_CODE_BADENC); + } + + return (SNMP_CODE_OK); +} + +/* + * 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; + + 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 + return (SNMP_CODE_BADVERS); + if (err != ASN_ERR_OK) + return (SNMP_CODE_FAILED); + + 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); +} + +enum snmp_code +snmp_fix_encoding(struct asn_buf *b, const struct snmp_pdu *pdu) +{ + if (asn_commit_header(b, pdu->vars_ptr) != ASN_ERR_OK || + asn_commit_header(b, pdu->pdu_ptr) != ASN_ERR_OK || + asn_commit_header(b, pdu->outer_ptr) != ASN_ERR_OK) + return (SNMP_CODE_FAILED); + 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); + 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 + 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_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); +} |