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Diffstat (limited to 'contrib/bsnmp/snmpd/export.c')
| -rw-r--r-- | contrib/bsnmp/snmpd/export.c | 378 |
1 files changed, 378 insertions, 0 deletions
diff --git a/contrib/bsnmp/snmpd/export.c b/contrib/bsnmp/snmpd/export.c new file mode 100644 index 0000000..4cebdb3 --- /dev/null +++ b/contrib/bsnmp/snmpd/export.c @@ -0,0 +1,378 @@ +/* + * Copyright (c) 2001-2003 + * Fraunhofer Institute for Open Communication Systems (FhG Fokus). + * All rights reserved. + * + * Author: Harti Brandt <harti@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. + * 3. Neither the name of the Institute nor the names of its contributors + * may be used to endorse or promote products derived from this software + * without specific prior written permission. + * + * THIS SOFTWARE AND DOCUMENTATION IS PROVIDED BY FRAUNHOFER FOKUS + * AND ITS 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 + * FRAUNHOFER FOKUS OR ITS 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/snmpd/export.c,v 1.5 2003/01/28 13:44:35 hbb Exp $ + * + * Support functions for modules. + */ +#include <sys/types.h> +#include <sys/un.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <syslog.h> +#include <stdarg.h> + +#include "snmpmod.h" +#include "snmpd.h" +#include "tree.h" + +/* + * Support functions + */ + +/* + * This is user for SET of string variables. If 'req' is not -1 then + * the arguments is checked to be of that length. The old value is saved + * in scratch->ptr1 and the new value is allocated and copied. + * If there is an old values it must have been allocated by malloc. + */ +int +string_save(struct snmp_value *value, struct snmp_context *ctx, + ssize_t req_size, u_char **valp) +{ + if (req_size != -1 && value->v.octetstring.len != (u_long)req_size) + return (SNMP_ERR_BADVALUE); + + ctx->scratch->ptr1 = *valp; + + if ((*valp = malloc(value->v.octetstring.len + 1)) == NULL) { + *valp = ctx->scratch->ptr1; + return (SNMP_ERR_RES_UNAVAIL); + } + + memcpy(*valp, value->v.octetstring.octets, value->v.octetstring.len); + (*valp)[value->v.octetstring.len] = '\0'; + + return (0); +} + +/* + * Commit a string. This is easy - free the old value. + */ +void +string_commit(struct snmp_context *ctx) +{ + free(ctx->scratch->ptr1); +} + +/* + * Rollback a string - free new value and copy back old one. + */ +void +string_rollback(struct snmp_context *ctx, u_char **valp) +{ + free(*valp); + *valp = ctx->scratch->ptr1; +} + +/* + * ROLLBACK or COMMIT fails because instance has disappeared. Free string. + */ +void +string_free(struct snmp_context *ctx) +{ + free(ctx->scratch->ptr1); +} + +/* + * Get a string value for a response packet + */ +int +string_get(struct snmp_value *value, const u_char *ptr, ssize_t len) +{ + if (ptr == NULL) { + value->v.octetstring.len = 0; + value->v.octetstring.octets = NULL; + return (SNMP_ERR_NOERROR); + } + if (len == -1) + len = strlen(ptr); + value->v.octetstring.len = (u_long)len; + if ((value->v.octetstring.octets = malloc((size_t)len)) == NULL) + return (SNMP_ERR_RES_UNAVAIL); + memcpy(value->v.octetstring.octets, ptr, (size_t)len); + return (SNMP_ERR_NOERROR); +} + +/* + * Support for IPADDRESS + * + * Save the old IP address in scratch->int1 and set the new one. + */ +int +ip_save(struct snmp_value *value, struct snmp_context *ctx, u_char *valp) +{ + ctx->scratch->int1 = (valp[0] << 24) | (valp[1] << 16) | (valp[2] << 8) + | valp[3]; + + valp[0] = value->v.ipaddress[0]; + valp[1] = value->v.ipaddress[1]; + valp[2] = value->v.ipaddress[2]; + valp[3] = value->v.ipaddress[3]; + + return (0); +} + +/* + * Rollback the address by copying back the old one + */ +void +ip_rollback(struct snmp_context *ctx, u_char *valp) +{ + valp[0] = ctx->scratch->int1 >> 24; + valp[1] = ctx->scratch->int1 >> 16; + valp[2] = ctx->scratch->int1 >> 8; + valp[3] = ctx->scratch->int1; +} + +/* + * Nothing to do for commit + */ +void +ip_commit(struct snmp_context *ctx __unused) +{ +} + +/* + * Retrieve an IP address + */ +int +ip_get(struct snmp_value *value, u_char *valp) +{ + value->v.ipaddress[0] = valp[0]; + value->v.ipaddress[1] = valp[1]; + value->v.ipaddress[2] = valp[2]; + value->v.ipaddress[3] = valp[3]; + return (SNMP_ERR_NOERROR); +} + +/* + * Object ID support + * + * Save the old value in a fresh allocated oid pointed to by scratch->ptr1. + */ +int +oid_save(struct snmp_value *value, struct snmp_context *ctx, + struct asn_oid *oid) +{ + if ((ctx->scratch->ptr1 = malloc(sizeof(struct asn_oid))) == NULL) + return (SNMP_ERR_RES_UNAVAIL); + *(struct asn_oid *)ctx->scratch->ptr1 = *oid; + *oid = value->v.oid; + + return (0); +} + +void +oid_rollback(struct snmp_context *ctx, struct asn_oid *oid) +{ + *oid = *(struct asn_oid *)ctx->scratch->ptr1; + free(ctx->scratch->ptr1); +} + +void +oid_commit(struct snmp_context *ctx) +{ + free(ctx->scratch->ptr1); +} + +int +oid_get(struct snmp_value *value, const struct asn_oid *oid) +{ + value->v.oid = *oid; + return (SNMP_ERR_NOERROR); +} + +/* + * Decode an index + */ +int +index_decode(const struct asn_oid *oid, u_int sub, u_int code, ...) +{ + va_list ap; + u_int index_count; + void *octs[10]; + u_int nocts; + u_int idx; + + va_start(ap, code); + index_count = SNMP_INDEX_COUNT(code); + nocts = 0; + + for (idx = 0; idx < index_count; idx++) { + switch (SNMP_INDEX(code, idx)) { + + case SNMP_SYNTAX_NULL: + break; + + case SNMP_SYNTAX_INTEGER: + if (sub == oid->len) + goto err; + *va_arg(ap, int32_t *) = oid->subs[sub++]; + break; + + case SNMP_SYNTAX_COUNTER64: + if (sub == oid->len) + goto err; + *va_arg(ap, u_int64_t *) = oid->subs[sub++]; + break; + + case SNMP_SYNTAX_OCTETSTRING: + { + u_char **cval; + size_t *sval; + u_int i; + + /* only variable size supported */ + if (sub == oid->len) + goto err; + cval = va_arg(ap, u_char **); + sval = va_arg(ap, size_t *); + *sval = oid->subs[sub++]; + if (sub + *sval > oid->len) + goto err; + if ((*cval = malloc(*sval)) == NULL) { + syslog(LOG_ERR, "%s: %m", __func__); + goto err; + } + octs[nocts++] = *cval; + for (i = 0; i < *sval; i++) { + if (oid->subs[sub] > 0xff) + goto err; + (*cval)[i] = oid->subs[sub++]; + } + break; + } + + case SNMP_SYNTAX_OID: + { + struct asn_oid *aval; + u_int i; + + if (sub == oid->len) + goto err; + aval = va_arg(ap, struct asn_oid *); + aval->len = oid->subs[sub++]; + if (aval->len > ASN_MAXOIDLEN) + goto err; + for (i = 0; i < aval->len; i++) + aval->subs[i] = oid->subs[sub++]; + break; + } + + case SNMP_SYNTAX_IPADDRESS: + { + u_int8_t *pval; + u_int i; + + if (sub + 4 > oid->len) + goto err; + pval = va_arg(ap, u_int8_t *); + for (i = 0; i < 4; i++) { + if (oid->subs[sub] > 0xff) + goto err; + pval[i] = oid->subs[sub++]; + } + break; + } + + case SNMP_SYNTAX_COUNTER: + case SNMP_SYNTAX_GAUGE: + case SNMP_SYNTAX_TIMETICKS: + if (sub == oid->len) + goto err; + if (oid->subs[sub] > 0xffffffff) + goto err; + *va_arg(ap, u_int32_t *) = oid->subs[sub++]; + break; + } + } + + va_end(ap); + return (0); + + err: + va_end(ap); + while(nocts > 0) + free(octs[--nocts]); + return (-1); +} + +/* + * Compare the index part of an OID and an index. + */ +int +index_compare_off(const struct asn_oid *oid, u_int sub, + const struct asn_oid *idx, u_int off) +{ + u_int i; + + for (i = off; i < idx->len && i < oid->len - sub; i++) { + if (oid->subs[sub + i] < idx->subs[i]) + return (-1); + if (oid->subs[sub + i] > idx->subs[i]) + return (+1); + } + if (oid->len - sub < idx->len) + return (-1); + if (oid->len - sub > idx->len) + return (+1); + + return (0); +} + +int +index_compare(const struct asn_oid *oid, u_int sub, const struct asn_oid *idx) +{ + return (index_compare_off(oid, sub, idx, 0)); +} + +/* + * Append an index to an oid + */ +void +index_append_off(struct asn_oid *var, u_int sub, const struct asn_oid *idx, + u_int off) +{ + u_int i; + + var->len = sub + idx->len; + for (i = off; i < idx->len; i++) + var->subs[sub + i] = idx->subs[i]; +} +void +index_append(struct asn_oid *var, u_int sub, const struct asn_oid *idx) +{ + index_append_off(var, sub, idx, 0); +} + |
