diff options
Diffstat (limited to 'bsnmp')
| -rw-r--r-- | bsnmp/Makefile.am | 4 | ||||
| -rw-r--r-- | bsnmp/asn1.c | 1000 | ||||
| -rw-r--r-- | bsnmp/asn1.h | 183 | ||||
| -rw-r--r-- | bsnmp/snmp.c | 1081 | ||||
| -rw-r--r-- | bsnmp/snmp.h | 174 | ||||
| -rw-r--r-- | bsnmp/snmppriv.h | 45 |
6 files changed, 2487 insertions, 0 deletions
diff --git a/bsnmp/Makefile.am b/bsnmp/Makefile.am new file mode 100644 index 0000000..7a7a739 --- /dev/null +++ b/bsnmp/Makefile.am @@ -0,0 +1,4 @@ + +noinst_LIBRARIES = libbsnmp-custom.a +libbsnmp_custom_a_SOURCES = asn1.c asn1.h snmp.c snmp.h snmppriv.h + diff --git a/bsnmp/asn1.c b/bsnmp/asn1.c new file mode 100644 index 0000000..8a206ee --- /dev/null +++ b/bsnmp/asn1.c @@ -0,0 +1,1000 @@ +/* + * 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/asn1.c,v 1.28 2004/08/06 08:46:49 brandt Exp $ + * + * ASN.1 for SNMP. + */ +#include <sys/types.h> +#include <stdio.h> +#include <stdlib.h> +#include <stdarg.h> +#include <string.h> +#include <stdint.h> +#include <assert.h> +#include "asn1.h" + +static void asn_error_func(const struct asn_buf *, const char *, ...); + +void (*asn_error)(const struct asn_buf *, const char *, ...) = asn_error_func; + +/* + * Read the next header. This reads the tag (note, that only single + * byte tags are supported for now) and the length field. The length field + * is restricted to a 32-bit value. + * All errors of this function stop the decoding. + */ +enum asn_err +asn_get_header(struct asn_buf *b, u_char *type, asn_len_t *len) +{ + u_int length; + + if (b->asn_len == 0) { + asn_error(b, "no identifier for header"); + return (ASN_ERR_EOBUF); + } + *type = *b->asn_cptr; + if ((*type & ASN_TYPE_MASK) > 0x30) { + asn_error(b, "types > 0x30 not supported (%u)", + *type & ASN_TYPE_MASK); + return (ASN_ERR_FAILED); + } + b->asn_cptr++; + b->asn_len--; + if (b->asn_len == 0) { + asn_error(b, "no length field"); + return (ASN_ERR_EOBUF); + } + if (*b->asn_cptr & 0x80) { + length = *b->asn_cptr++ & 0x7f; + b->asn_len--; + if (length == 0) { + asn_error(b, "indefinite length not supported"); + return (ASN_ERR_FAILED); + } + if (length > ASN_MAXLENLEN) { + asn_error(b, "long length too long (%u)", length); + return (ASN_ERR_FAILED); + } + if (length > b->asn_len) { + asn_error(b, "long length truncated"); + return (ASN_ERR_EOBUF); + } + *len = 0; + while (length--) { + *len = (*len << 8) | *b->asn_cptr++; + b->asn_len--; + } + } else { + *len = *b->asn_cptr++; + b->asn_len--; + } + return (ASN_ERR_OK); +} + +/* + * Write a length field (restricted to values < 2^32-1) and return the + * number of bytes this field takes. If ptr is NULL, the length is computed + * but nothing is written. If the length would be too large return 0. + */ +static u_int +asn_put_len(u_char *ptr, asn_len_t len) +{ + u_int lenlen, lenlen1; + asn_len_t tmp; + + if (len > ASN_MAXLEN) { + asn_error(NULL, "encoding length too long: (%u)", len); + return (0); + } + + if (len <= 127) { + if (ptr) + *ptr++ = (u_char)len; + return (1); + } else { + lenlen = 0; + /* compute number of bytes for value (is at least 1) */ + for (tmp = len; tmp != 0; tmp >>= 8) + lenlen++; + if (ptr != NULL) { + *ptr++ = (u_char)lenlen | 0x80; + lenlen1 = lenlen; + while (lenlen1-- > 0) { + ptr[lenlen1] = len & 0xff; + len >>= 8; + } + } + return (lenlen + 1); + } +} + +/* + * Write a header (tag and length fields). + * Tags are restricted to one byte tags (value <= 0x30) and the + * lenght field to 16-bit. All errors stop the encoding. + */ +enum asn_err +asn_put_header(struct asn_buf *b, u_char type, asn_len_t len) +{ + u_int lenlen; + + /* tag field */ + if ((type & ASN_TYPE_MASK) > 0x30) { + asn_error(NULL, "types > 0x30 not supported (%u)", + type & ASN_TYPE_MASK); + return (ASN_ERR_FAILED); + } + if (b->asn_len == 0) + return (ASN_ERR_EOBUF); + + *b->asn_ptr++ = type; + b->asn_len--; + + /* length field */ + if ((lenlen = asn_put_len(NULL, len)) == 0) + return (ASN_ERR_FAILED); + if (b->asn_len < lenlen) + return (ASN_ERR_EOBUF); + + (void)asn_put_len(b->asn_ptr, len); + b->asn_ptr += lenlen; + b->asn_len -= lenlen; + return (ASN_ERR_OK); +} + + +/* + * This constructs a temporary sequence header with space for the maximum + * length field (three byte). Set the pointer that ptr points to to the + * start of the encoded header. This is used for a later call to + * asn_commit_header which will fix-up the length field and move the + * value if needed. All errors should stop the encoding. + */ +#define TEMP_LEN (1 + ASN_MAXLENLEN + 1) +enum asn_err +asn_put_temp_header(struct asn_buf *b, u_char type, u_char **ptr) +{ + int ret; + + if (b->asn_len < TEMP_LEN) + return (ASN_ERR_EOBUF); + *ptr = b->asn_ptr; + if ((ret = asn_put_header(b, type, ASN_MAXLEN)) == ASN_ERR_OK) + assert(b->asn_ptr == *ptr + TEMP_LEN); + return (ret); +} +enum asn_err +asn_commit_header(struct asn_buf *b, u_char *ptr) +{ + asn_len_t len; + u_int lenlen, shift; + + /* compute length of encoded value without header */ + len = b->asn_ptr - (ptr + TEMP_LEN); + + /* insert length. may not fail. */ + lenlen = asn_put_len(ptr + 1, len); + if (lenlen > TEMP_LEN - 1) + return (ASN_ERR_FAILED); + + if (lenlen < TEMP_LEN - 1) { + /* shift value down */ + shift = (TEMP_LEN - 1) - lenlen; + memmove(ptr + 1 + lenlen, ptr + TEMP_LEN, len); + b->asn_ptr -= shift; + b->asn_len += shift; + } + return (ASN_ERR_OK); +} +#undef TEMP_LEN + +/* + * BER integer. This may be used to get a signed 64 bit integer at maximum. + * The maximum length should be checked by the caller. This cannot overflow + * if the caller ensures that len is at maximum 8. + * + * <bytes> + */ +static enum asn_err +asn_get_real_integer(struct asn_buf *b, asn_len_t len, int64_t *vp) +{ + uint64_t val; + int neg = 0; + enum asn_err err; + + if (b->asn_len < len) { + asn_error(b, "truncated integer"); + return (ASN_ERR_EOBUF); + } + if (len == 0) { + asn_error(b, "zero-length integer"); + *vp = 0; + return (ASN_ERR_BADLEN); + } + err = ASN_ERR_OK; + if (len > 8) + err = ASN_ERR_RANGE; + else if (len > 1 && + ((*b->asn_cptr == 0x00 && (b->asn_cptr[1] & 0x80) == 0) || + (*b->asn_cptr == 0xff && (b->asn_cptr[1] & 0x80) == 0x80))) { + asn_error(b, "non-minimal integer"); + err = ASN_ERR_BADLEN; + } + + if (*b->asn_cptr & 0x80) + neg = 1; + val = 0; + while (len--) { + val <<= 8; + val |= neg ? (u_char)~*b->asn_cptr : *b->asn_cptr; + b->asn_len--; + b->asn_cptr++; + } + if (neg) { + *vp = -(int64_t)val - 1; + } else + *vp = (int64_t)val; + return (err); +} + +/* + * Write a signed integer with the given type. The caller has to ensure + * that the actual value is ok for this type. + */ +static enum asn_err +asn_put_real_integer(struct asn_buf *b, u_char type, int64_t ival) +{ + int i, neg = 0; +# define OCTETS 8 + u_char buf[OCTETS]; + uint64_t val; + enum asn_err ret; + + if (ival < 0) { + /* this may fail if |INT64_MIN| > |INT64_MAX| and + * the value is between * INT64_MIN <= ival < -(INT64_MAX+1) */ + val = (uint64_t)-(ival + 1); + neg = 1; + } else + val = (uint64_t)ival; + + /* split the value into octets */ + for (i = OCTETS - 1; i >= 0; i--) { + buf[i] = val & 0xff; + if (neg) + buf[i] = ~buf[i]; + val >>= 8; + } + /* no leading 9 zeroes or ones */ + for (i = 0; i < OCTETS - 1; i++) + if (!((buf[i] == 0xff && (buf[i + 1] & 0x80) != 0) || + (buf[i] == 0x00 && (buf[i + 1] & 0x80) == 0))) + break; + if ((ret = asn_put_header(b, type, OCTETS - i))) + return (ret); + if (OCTETS - (u_int)i > b->asn_len) + return (ASN_ERR_EOBUF); + + while (i < OCTETS) { + *b->asn_ptr++ = buf[i++]; + b->asn_len--; + } + return (ASN_ERR_OK); +# undef OCTETS +} + + +/* + * The same for unsigned 64-bitters. Here we have the problem, that overflow + * can happen, because the value maybe 9 bytes long. In this case the + * first byte must be 0. + */ +static enum asn_err +asn_get_real_unsigned(struct asn_buf *b, asn_len_t len, uint64_t *vp) +{ + enum asn_err err; + + if (b->asn_len < len) { + asn_error(b, "truncated integer"); + return (ASN_ERR_EOBUF); + } + if (len == 0) { + asn_error(b, "zero-length integer"); + *vp = 0; + return (ASN_ERR_BADLEN); + } + err = ASN_ERR_OK; + *vp = 0; + if ((*b->asn_cptr & 0x80) || (len == 9 && *b->asn_cptr != 0)) { + /* negative integer or too larger */ + *vp = 0xffffffffffffffffULL; + err = ASN_ERR_RANGE; + } else if (len > 1 && + *b->asn_cptr == 0x00 && (b->asn_cptr[1] & 0x80) == 0) { + asn_error(b, "non-minimal unsigned"); + err = ASN_ERR_BADLEN; + } + + while (len--) { + *vp = (*vp << 8) | *b->asn_cptr++; + b->asn_len--; + } + return (err); +} + + +/* + * Values with the msb on need 9 octets. + */ +static int +asn_put_real_unsigned(struct asn_buf *b, u_char type, uint64_t val) +{ + int i; +# define OCTETS 9 + u_char buf[OCTETS]; + enum asn_err ret; + + /* split the value into octets */ + for (i = OCTETS - 1; i >= 0; i--) { + buf[i] = val & 0xff; + val >>= 8; + } + /* no leading 9 zeroes */ + for (i = 0; i < OCTETS - 1; i++) + if (!(buf[i] == 0x00 && (buf[i + 1] & 0x80) == 0)) + break; + if ((ret = asn_put_header(b, type, OCTETS - i))) + return (ret); + if (OCTETS - (u_int)i > b->asn_len) + return (ASN_ERR_EOBUF); + + while (i < OCTETS) { + *b->asn_ptr++ = buf[i++]; + b->asn_len--; + } +#undef OCTETS + return (ASN_ERR_OK); +} + +/* + * The ASN.1 INTEGER type is restricted to 32-bit signed by the SMI. + */ +enum asn_err +asn_get_integer_raw(struct asn_buf *b, asn_len_t len, int32_t *vp) +{ + int64_t val; + enum asn_err ret; + + if ((ret = asn_get_real_integer(b, len, &val)) == ASN_ERR_OK) { + if (len > 4) + ret = ASN_ERR_BADLEN; + else if (val > INT32_MAX || val < INT32_MIN) + /* may not happen */ + ret = ASN_ERR_RANGE; + *vp = (int32_t)val; + } + return (ret); +} + +enum asn_err +asn_get_integer(struct asn_buf *b, int32_t *vp) +{ + asn_len_t len; + u_char type; + enum asn_err err; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != ASN_TYPE_INTEGER) { + asn_error(b, "bad type for integer (%u)", type); + return (ASN_ERR_TAG); + } + + return (asn_get_integer_raw(b, len, vp)); +} + +enum asn_err +asn_put_integer(struct asn_buf *b, int32_t val) +{ + return (asn_put_real_integer(b, ASN_TYPE_INTEGER, val)); +} + +/* + * OCTETSTRING + * + * <0x04> <len> <data ...> + * + * Get an octetstring. noctets must point to the buffer size and on + * return will contain the size of the octetstring, regardless of the + * buffer size. + */ +enum asn_err +asn_get_octetstring_raw(struct asn_buf *b, asn_len_t len, u_char *octets, + u_int *noctets) +{ + enum asn_err err = ASN_ERR_OK; + + if (*noctets < len) { + asn_error(b, "octetstring truncated"); + err = ASN_ERR_RANGE; + } + if (b->asn_len < len) { + asn_error(b, "truncatet octetstring"); + return (ASN_ERR_EOBUF); + } + if (*noctets < len) + memcpy(octets, b->asn_cptr, *noctets); + else + memcpy(octets, b->asn_cptr, len); + *noctets = len; + b->asn_cptr += len; + b->asn_len -= len; + return (err); +} + +enum asn_err +asn_get_octetstring(struct asn_buf *b, u_char *octets, u_int *noctets) +{ + enum asn_err err; + u_char type; + asn_len_t len; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != ASN_TYPE_OCTETSTRING) { + asn_error(b, "bad type for octetstring (%u)", type); + return (ASN_ERR_TAG); + } + return (asn_get_octetstring_raw(b, len, octets, noctets)); +} + +enum asn_err +asn_put_octetstring(struct asn_buf *b, const u_char *octets, u_int noctets) +{ + enum asn_err ret; + + if ((ret = asn_put_header(b, ASN_TYPE_OCTETSTRING, noctets)) != ASN_ERR_OK) + return (ret); + if (b->asn_len < noctets) + return (ASN_ERR_EOBUF); + + memcpy(b->asn_ptr, octets, noctets); + b->asn_ptr += noctets; + b->asn_len -= noctets; + return (ASN_ERR_OK); +} + +/* + * NULL + * + * <0x05> <0x00> + */ +enum asn_err +asn_get_null_raw(struct asn_buf *b, asn_len_t len) +{ + if (len != 0) { + if (b->asn_len < len) { + asn_error(b, "truncated NULL"); + return (ASN_ERR_EOBUF); + } + asn_error(b, "bad length for NULL (%u)", len); + b->asn_len -= len; + b->asn_ptr += len; + return (ASN_ERR_BADLEN); + } + return (ASN_ERR_OK); +} + +enum asn_err +asn_get_null(struct asn_buf *b) +{ + u_char type; + asn_len_t len; + enum asn_err err; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != ASN_TYPE_NULL) { + asn_error(b, "bad type for NULL (%u)", type); + return (ASN_ERR_TAG); + } + return (asn_get_null_raw(b, len)); +} + +enum asn_err +asn_put_null(struct asn_buf *b) +{ + return (asn_put_header(b, ASN_TYPE_NULL, 0)); +} + +enum asn_err +asn_put_exception(struct asn_buf *b, u_int except) +{ + return (asn_put_header(b, ASN_CLASS_CONTEXT | except, 0)); +} + +/* + * OBJID + * + * <0x06> <len> <subid...> + */ +enum asn_err +asn_get_objid_raw(struct asn_buf *b, asn_len_t len, struct asn_oid *oid) +{ + asn_subid_t subid; + enum asn_err err; + + if (b->asn_len < len) { + asn_error(b, "truncated OBJID"); + return (ASN_ERR_EOBUF); + } + oid->len = 0; + if (len == 0) { + asn_error(b, "short OBJID"); + oid->subs[oid->len++] = 0; + oid->subs[oid->len++] = 0; + return (ASN_ERR_BADLEN); + } + err = ASN_ERR_OK; + while (len != 0) { + if (oid->len == ASN_MAXOIDLEN) { + asn_error(b, "OID too long (%u)", oid->len); + b->asn_cptr += len; + b->asn_len -= len; + return (ASN_ERR_BADLEN); + } + subid = 0; + do { + if (len == 0) { + asn_error(b, "unterminated subid"); + return (ASN_ERR_EOBUF); + } + if (subid > (ASN_MAXID >> 7)) { + asn_error(b, "OBID subid too larger"); + err = ASN_ERR_RANGE; + } + subid = (subid << 7) | (*b->asn_cptr & 0x7f); + len--; + b->asn_len--; + } while (*b->asn_cptr++ & 0x80); + if (oid->len == 0) { + if (subid < 80) { + oid->subs[oid->len++] = subid / 40; + oid->subs[oid->len++] = subid % 40; + } else { + oid->subs[oid->len++] = 2; + oid->subs[oid->len++] = subid - 80; + } + } else { + oid->subs[oid->len++] = subid; + } + } + return (err); + +} + +enum asn_err +asn_get_objid(struct asn_buf *b, struct asn_oid *oid) +{ + u_char type; + asn_len_t len; + enum asn_err err; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != ASN_TYPE_OBJID) { + asn_error(b, "bad type for OBJID (%u)", type); + return (ASN_ERR_TAG); + } + return (asn_get_objid_raw(b, len, oid)); +} + +enum asn_err +asn_put_objid(struct asn_buf *b, const struct asn_oid *oid) +{ + asn_subid_t first, sub; + enum asn_err err, err1; + u_int i, oidlen; + asn_len_t len; + + err = ASN_ERR_OK; + if (oid->len == 0) { + /* illegal */ + asn_error(NULL, "short oid"); + err = ASN_ERR_RANGE; + first = 0; + oidlen = 2; + } else if (oid->len == 1) { + /* illegal */ + asn_error(b, "short oid"); + if (oid->subs[0] > 2) + asn_error(NULL, "oid[0] too large (%u)", oid->subs[0]); + err = ASN_ERR_RANGE; + first = oid->subs[0] * 40; + oidlen = 2; + } else { + if (oid->len > ASN_MAXOIDLEN) { + asn_error(NULL, "oid too long %u", oid->len); + err = ASN_ERR_RANGE; + } + if (oid->subs[0] > 2 || + (oid->subs[0] < 2 && oid->subs[0] >= 40)) { + asn_error(NULL, "oid out of range (%u,%u)", + oid->subs[0], oid->subs[1]); + err = ASN_ERR_RANGE; + } + first = 40 * oid->subs[0] + oid->subs[1]; + oidlen = oid->len; + } + len = 0; + for (i = 1; i < oidlen; i++) { + sub = (i == 1) ? first : oid->subs[i]; + if (sub > ASN_MAXID) { + asn_error(NULL, "oid subid too large"); + err = ASN_ERR_RANGE; + } + len += (sub <= 0x7f) ? 1 + : (sub <= 0x3fff) ? 2 + : (sub <= 0x1fffff) ? 3 + : (sub <= 0xfffffff) ? 4 + : 5; + } + if ((err1 = asn_put_header(b, ASN_TYPE_OBJID, len)) != ASN_ERR_OK) + return (err1); + if (b->asn_len < len) + return (ASN_ERR_EOBUF); + + for (i = 1; i < oidlen; i++) { + sub = (i == 1) ? first : oid->subs[i]; + if (sub <= 0x7f) { + *b->asn_ptr++ = sub; + b->asn_len--; + } else if (sub <= 0x3fff) { + *b->asn_ptr++ = (sub >> 7) | 0x80; + *b->asn_ptr++ = sub & 0x7f; + b->asn_len -= 2; + } else if (sub <= 0x1fffff) { + *b->asn_ptr++ = (sub >> 14) | 0x80; + *b->asn_ptr++ = ((sub >> 7) & 0x7f) | 0x80; + *b->asn_ptr++ = sub & 0x7f; + b->asn_len -= 3; + } else if (sub <= 0xfffffff) { + *b->asn_ptr++ = (sub >> 21) | 0x80; + *b->asn_ptr++ = ((sub >> 14) & 0x7f) | 0x80; + *b->asn_ptr++ = ((sub >> 7) & 0x7f) | 0x80; + *b->asn_ptr++ = sub & 0x7f; + b->asn_len -= 4; + } else { + *b->asn_ptr++ = (sub >> 28) | 0x80; + *b->asn_ptr++ = ((sub >> 21) & 0x7f) | 0x80; + *b->asn_ptr++ = ((sub >> 14) & 0x7f) | 0x80; + *b->asn_ptr++ = ((sub >> 7) & 0x7f) | 0x80; + *b->asn_ptr++ = sub & 0x7f; + b->asn_len -= 5; + } + } + return (err); +} +/* + * SEQUENCE header + * + * <0x10|0x20> <len> <data...> + */ +enum asn_err +asn_get_sequence(struct asn_buf *b, asn_len_t *len) +{ + u_char type; + enum asn_err err; + + if ((err = asn_get_header(b, &type, len)) != ASN_ERR_OK) + return (err); + if (type != (ASN_TYPE_SEQUENCE|ASN_TYPE_CONSTRUCTED)) { + asn_error(b, "bad sequence type %u", type); + return (ASN_ERR_TAG); + } + if (*len > b->asn_len) { + asn_error(b, "truncated sequence"); + return (ASN_ERR_EOBUF); + } + return (ASN_ERR_OK); +} + +/* + * Application types + * + * 0x40 4 MSB 2MSB 2LSB LSB + */ +enum asn_err +asn_get_ipaddress_raw(struct asn_buf *b, asn_len_t len, u_char *addr) +{ + u_int i; + + if (b->asn_len < len) { + asn_error(b, "truncated ip-address"); + return (ASN_ERR_EOBUF); + } + if (len < 4) { + asn_error(b, "short length for ip-Address %u", len); + for (i = 0; i < len; i++) + *addr++ = *b->asn_cptr++; + while (i++ < len) + *addr++ = 0; + b->asn_len -= len; + return (ASN_ERR_BADLEN); + } + for (i = 0; i < 4; i++) + *addr++ = *b->asn_cptr++; + b->asn_cptr += len - 4; + b->asn_len -= len; + return (ASN_ERR_OK); +} + +enum asn_err +asn_get_ipaddress(struct asn_buf *b, u_char *addr) +{ + u_char type; + asn_len_t len; + enum asn_err err; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != (ASN_CLASS_APPLICATION|ASN_APP_IPADDRESS)) { + asn_error(b, "bad type for ip-address %u", type); + return (ASN_ERR_TAG); + } + return (asn_get_ipaddress_raw(b, len, addr)); +} + +enum asn_err +asn_put_ipaddress(struct asn_buf *b, const u_char *addr) +{ + enum asn_err err; + + if ((err = asn_put_header(b, ASN_CLASS_APPLICATION|ASN_APP_IPADDRESS, + 4)) != ASN_ERR_OK) + return (err); + if (b->asn_len < 4) + return (ASN_ERR_EOBUF); + + memcpy(b->asn_ptr, addr, 4); + b->asn_ptr += 4; + b->asn_len -= 4; + return (ASN_ERR_OK); +} + + +/* + * UNSIGNED32 + * + * 0x42|0x41 <len> ... + */ +enum asn_err +asn_get_uint32_raw(struct asn_buf *b, asn_len_t len, uint32_t *vp) +{ + uint64_t v; + enum asn_err err; + + if ((err = asn_get_real_unsigned(b, len, &v)) == ASN_ERR_OK) { + if (len > 5) { + asn_error(b, "uint32 too long %u", len); + err = ASN_ERR_BADLEN; + } else if (v > UINT32_MAX) { + asn_error(b, "uint32 too large %llu", v); + err = ASN_ERR_RANGE; + } + *vp = (uint32_t)v; + } + return (err); +} + +enum asn_err +asn_put_uint32(struct asn_buf *b, u_char type, uint32_t val) +{ + uint64_t v = val; + + return (asn_put_real_unsigned(b, ASN_CLASS_APPLICATION|type, v)); +} + +/* + * COUNTER64 + * 0x46 <len> ... + */ +enum asn_err +asn_get_counter64_raw(struct asn_buf *b, asn_len_t len, uint64_t *vp) +{ + return (asn_get_real_unsigned(b, len, vp)); +} + +enum asn_err +asn_put_counter64(struct asn_buf *b, uint64_t val) +{ + return (asn_put_real_unsigned(b, + ASN_CLASS_APPLICATION | ASN_APP_COUNTER64, val)); +} + +/* + * TimeTicks + * 0x43 <len> ... + */ +enum asn_err +asn_get_timeticks(struct asn_buf *b, uint32_t *vp) +{ + asn_len_t len; + u_char type; + enum asn_err err; + + if ((err = asn_get_header(b, &type, &len)) != ASN_ERR_OK) + return (err); + if (type != (ASN_CLASS_APPLICATION|ASN_APP_TIMETICKS)) { + asn_error(b, "bad type for timeticks %u", type); + return (ASN_ERR_TAG); + } + return (asn_get_uint32_raw(b, len, vp)); +} + +enum asn_err +asn_put_timeticks(struct asn_buf *b, uint32_t val) +{ + uint64_t v = val; + + return (asn_put_real_unsigned(b, + ASN_CLASS_APPLICATION | ASN_APP_TIMETICKS, v)); +} + +/* + * Construct a new OID by taking a range of sub ids of the original oid. + */ +void +asn_slice_oid(struct asn_oid *dest, const struct asn_oid *src, + u_int from, u_int to) +{ + if (from >= to) { + dest->len = 0; + return; + } + dest->len = to - from; + memcpy(dest->subs, &src->subs[from], dest->len * sizeof(dest->subs[0])); +} + +/* + * Append from to to + */ +void +asn_append_oid(struct asn_oid *to, const struct asn_oid *from) +{ + memcpy(&to->subs[to->len], &from->subs[0], + from->len * sizeof(from->subs[0])); + to->len += from->len; +} + +/* + * Skip a value + */ +enum asn_err +asn_skip(struct asn_buf *b, asn_len_t len) +{ + if (b->asn_len < len) + return (ASN_ERR_EOBUF); + b->asn_cptr += len; + b->asn_len -= len; + return (ASN_ERR_OK); +} + +/* + * Compare two OIDs. + * + * o1 < o2 : -1 + * o1 > o2 : +1 + * o1 = o2 : 0 + */ +int +asn_compare_oid(const struct asn_oid *o1, const struct asn_oid *o2) +{ + u_long i; + + for (i = 0; i < o1->len && i < o2->len; i++) { + if (o1->subs[i] < o2->subs[i]) + return (-1); + if (o1->subs[i] > o2->subs[i]) + return (+1); + } + if (o1->len < o2->len) + return (-1); + if (o1->len > o2->len) + return (+1); + return (0); +} + +/* + * Check whether an OID is a sub-string of another OID. + */ +int +asn_is_suboid(const struct asn_oid *o1, const struct asn_oid *o2) +{ + u_long i; + + for (i = 0; i < o1->len; i++) + if (i >= o2->len || o1->subs[i] != o2->subs[i]) + return (0); + return (1); +} + +/* + * Put a string representation of an oid into a user buffer. This buffer + * is assumed to be at least ASN_OIDSTRLEN characters long. + * + * sprintf is assumed not to fail here. + */ +char * +asn_oid2str_r(const struct asn_oid *oid, char *buf) +{ + u_int len, i; + char *ptr; + + if ((len = oid->len) > ASN_MAXOIDLEN) + len = ASN_MAXOIDLEN; + buf[0] = '\0'; + for (i = 0, ptr = buf; i < len; i++) { + if (i > 0) + *ptr++ = '.'; + ptr += sprintf(ptr, "%u", oid->subs[i]); + } + return (buf); +} + +/* + * Make a string from an OID in a private buffer. + */ +char * +asn_oid2str(const struct asn_oid *oid) +{ + static char str[ASN_OIDSTRLEN]; + + return (asn_oid2str_r(oid, str)); +} + + +static void +asn_error_func(const struct asn_buf *b, const char *err, ...) +{ + va_list ap; + u_long i; + + fprintf(stderr, "ASN.1: "); + va_start(ap, err); + vfprintf(stderr, err, ap); + va_end(ap); + + if (b != NULL) { + fprintf(stderr, " at"); + for (i = 0; b->asn_len > i; i++) + fprintf(stderr, " %02x", b->asn_cptr[i]); + } + fprintf(stderr, "\n"); +} diff --git a/bsnmp/asn1.h b/bsnmp/asn1.h new file mode 100644 index 0000000..23b7814 --- /dev/null +++ b/bsnmp/asn1.h @@ -0,0 +1,183 @@ +/* + * 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/asn1.h,v 1.18 2004/08/06 08:46:50 brandt Exp $ + * + * ASN.1 for SNMP + */ +#ifndef asn1_h_ +#define asn1_h_ + +#include <sys/types.h> +#include <stdint.h> + +struct asn_buf { + union { + u_char *ptr; + const u_char *cptr; + } asn_u; + size_t asn_len; +}; +#define asn_cptr asn_u.cptr +#define asn_ptr asn_u.ptr + +/* these restrictions are in the SMI */ +#define ASN_MAXID 0xffffffff +#define ASN_MAXOIDLEN 128 + +/* the string needed for this (with trailing zero) */ +#define ASN_OIDSTRLEN (ASN_MAXOIDLEN * (10 + 1) - 1 + 1) + +/* type of subidentifiers */ +typedef uint32_t asn_subid_t; + +struct asn_oid { + u_int len; + asn_subid_t subs[ASN_MAXOIDLEN]; +}; + +enum asn_err { + /* conversion was ok */ + ASN_ERR_OK = 0, + /* conversion failed and stopped */ + ASN_ERR_FAILED = 1 | 0x1000, + /* length field bad, value skipped */ + ASN_ERR_BADLEN = 2, + /* out of buffer, stopped */ + ASN_ERR_EOBUF = 3 | 0x1000, + /* length ok, but value is out of range */ + ASN_ERR_RANGE = 4, + /* not the expected tag, stopped */ + ASN_ERR_TAG = 5 | 0x1000, +}; +#define ASN_ERR_STOPPED(E) (((E) & 0x1000) != 0) + +/* type for the length field of encoded values. The length is restricted + * to 65535, but using uint16_t would give conversion warnings on gcc */ +typedef uint32_t asn_len_t; /* could be also uint16_t */ + +/* maximal length of a long length field without the length of the length */ +#define ASN_MAXLEN 65535 +#define ASN_MAXLENLEN 2 /* number of bytes in a length */ + +/* maximum size of an octet string as per SMIv2 */ +#define ASN_MAXOCTETSTRING 65535 + +extern void (*asn_error)(const struct asn_buf *, const char *, ...); + +enum asn_err asn_get_header(struct asn_buf *, u_char *, asn_len_t *); +enum asn_err asn_put_header(struct asn_buf *, u_char, asn_len_t); + +enum asn_err asn_put_temp_header(struct asn_buf *, u_char, u_char **); +enum asn_err asn_commit_header(struct asn_buf *, u_char *); + +enum asn_err asn_get_integer_raw(struct asn_buf *, asn_len_t, int32_t *); +enum asn_err asn_get_integer(struct asn_buf *, int32_t *); +enum asn_err asn_put_integer(struct asn_buf *, int32_t); + +enum asn_err asn_get_octetstring_raw(struct asn_buf *, asn_len_t, u_char *, u_int *); +enum asn_err asn_get_octetstring(struct asn_buf *, u_char *, u_int *); +enum asn_err asn_put_octetstring(struct asn_buf *, const u_char *, u_int); + +enum asn_err asn_get_null_raw(struct asn_buf *b, asn_len_t); +enum asn_err asn_get_null(struct asn_buf *); +enum asn_err asn_put_null(struct asn_buf *); + +enum asn_err asn_put_exception(struct asn_buf *, u_int); + +enum asn_err asn_get_objid_raw(struct asn_buf *, asn_len_t, struct asn_oid *); +enum asn_err asn_get_objid(struct asn_buf *, struct asn_oid *); +enum asn_err asn_put_objid(struct asn_buf *, const struct asn_oid *); + +enum asn_err asn_get_sequence(struct asn_buf *, asn_len_t *); + +enum asn_err asn_get_ipaddress_raw(struct asn_buf *, asn_len_t, u_char *); +enum asn_err asn_get_ipaddress(struct asn_buf *, u_char *); +enum asn_err asn_put_ipaddress(struct asn_buf *, const u_char *); + +enum asn_err asn_get_uint32_raw(struct asn_buf *, asn_len_t, uint32_t *); +enum asn_err asn_put_uint32(struct asn_buf *, u_char, uint32_t); + +enum asn_err asn_get_counter64_raw(struct asn_buf *, asn_len_t, uint64_t *); +enum asn_err asn_put_counter64(struct asn_buf *, uint64_t); + +enum asn_err asn_get_timeticks(struct asn_buf *, uint32_t *); +enum asn_err asn_put_timeticks(struct asn_buf *, uint32_t); + +enum asn_err asn_skip(struct asn_buf *, asn_len_t); + +/* + * Utility functions for OIDs + */ +/* get a sub-OID from the middle of another OID */ +void asn_slice_oid(struct asn_oid *, const struct asn_oid *, u_int, u_int); + +/* append an OID to another one */ +void asn_append_oid(struct asn_oid *, const struct asn_oid *); + +/* compare two OIDs */ +int asn_compare_oid(const struct asn_oid *, const struct asn_oid *); + +/* check whether the first is a suboid of the second one */ +int asn_is_suboid(const struct asn_oid *, const struct asn_oid *); + +/* format an OID into a user buffer of size ASN_OIDSTRLEN */ +char *asn_oid2str_r(const struct asn_oid *, char *); + +/* format an OID into a private static buffer */ +char *asn_oid2str(const struct asn_oid *); + +enum { + ASN_TYPE_BOOLEAN = 0x01, + ASN_TYPE_INTEGER = 0x02, + ASN_TYPE_BITSTRING = 0x03, + ASN_TYPE_OCTETSTRING = 0x04, + ASN_TYPE_NULL = 0x05, + ASN_TYPE_OBJID = 0x06, + ASN_TYPE_SEQUENCE = 0x10, + + ASN_TYPE_CONSTRUCTED = 0x20, + ASN_CLASS_UNIVERSAL = 0x00, + ASN_CLASS_APPLICATION = 0x40, + ASN_CLASS_CONTEXT = 0x80, + ASN_CLASS_PRIVATE = 0xc0, + ASN_TYPE_MASK = 0x1f, + + ASN_APP_IPADDRESS = 0x00, + ASN_APP_COUNTER = 0x01, + ASN_APP_GAUGE = 0x02, + ASN_APP_TIMETICKS = 0x03, + ASN_APP_OPAQUE = 0x04, /* not implemented */ + ASN_APP_COUNTER64 = 0x06, + + ASN_EXCEPT_NOSUCHOBJECT = 0x00, + ASN_EXCEPT_NOSUCHINSTANCE = 0x01, + ASN_EXCEPT_ENDOFMIBVIEW = 0x02, +}; + +#endif diff --git a/bsnmp/snmp.c b/bsnmp/snmp.c new file mode 100644 index 0000000..f758262 --- /dev/null +++ b/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); +} diff --git a/bsnmp/snmp.h b/bsnmp/snmp.h new file mode 100644 index 0000000..1ae0775 --- /dev/null +++ b/bsnmp/snmp.h @@ -0,0 +1,174 @@ +/* + * 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.h,v 1.30 2004/08/06 08:46:54 brandt Exp $ + * + * Header file for SNMP functions. + */ +#ifndef snmp_h_ +#define snmp_h_ + +#include <sys/types.h> + +#define SNMP_COMMUNITY_MAXLEN 128 +#define SNMP_MAX_BINDINGS 100 + +enum snmp_syntax { + SNMP_SYNTAX_NULL = 0, + SNMP_SYNTAX_INTEGER, /* == INTEGER32 */ + SNMP_SYNTAX_OCTETSTRING, + SNMP_SYNTAX_OID, + SNMP_SYNTAX_IPADDRESS, + SNMP_SYNTAX_COUNTER, + SNMP_SYNTAX_GAUGE, /* == UNSIGNED32 */ + SNMP_SYNTAX_TIMETICKS, + + /* v2 additions */ + SNMP_SYNTAX_COUNTER64, + SNMP_SYNTAX_NOSUCHOBJECT, /* exception */ + SNMP_SYNTAX_NOSUCHINSTANCE, /* exception */ + SNMP_SYNTAX_ENDOFMIBVIEW, /* exception */ +}; + +struct snmp_value { + struct asn_oid var; + enum snmp_syntax syntax; + union snmp_values { + int32_t integer; /* also integer32 */ + struct { + u_int len; + u_char *octets; + } octetstring; + struct asn_oid oid; + u_char ipaddress[4]; + uint32_t uint32; /* also gauge32, counter32, + unsigned32, timeticks */ + uint64_t counter64; + } v; +}; + +enum snmp_version { + SNMP_Verr = 0, + SNMP_V1 = 1, + SNMP_V2c, +}; + +struct snmp_pdu { + char community[SNMP_COMMUNITY_MAXLEN + 1]; + enum snmp_version version; + u_int type; + + /* trap only */ + struct asn_oid enterprise; + u_char agent_addr[4]; + int32_t generic_trap; + int32_t specific_trap; + uint32_t time_stamp; + + /* others */ + int32_t request_id; + int32_t error_status; + int32_t error_index; + + /* fixes for encoding */ + u_char *outer_ptr; + u_char *pdu_ptr; + u_char *vars_ptr; + + struct snmp_value bindings[SNMP_MAX_BINDINGS]; + u_int nbindings; +}; +#define snmp_v1_pdu snmp_pdu + +#define SNMP_PDU_GET 0 +#define SNMP_PDU_GETNEXT 1 +#define SNMP_PDU_RESPONSE 2 +#define SNMP_PDU_SET 3 +#define SNMP_PDU_TRAP 4 /* v1 */ +#define SNMP_PDU_GETBULK 5 /* v2 */ +#define SNMP_PDU_INFORM 6 /* v2 */ +#define SNMP_PDU_TRAP2 7 /* v2 */ +#define SNMP_PDU_REPORT 8 /* v2 */ + +#define SNMP_ERR_NOERROR 0 +#define SNMP_ERR_TOOBIG 1 +#define SNMP_ERR_NOSUCHNAME 2 /* v1 */ +#define SNMP_ERR_BADVALUE 3 /* v1 */ +#define SNMP_ERR_READONLY 4 /* v1 */ +#define SNMP_ERR_GENERR 5 +#define SNMP_ERR_NO_ACCESS 6 /* v2 */ +#define SNMP_ERR_WRONG_TYPE 7 /* v2 */ +#define SNMP_ERR_WRONG_LENGTH 8 /* v2 */ +#define SNMP_ERR_WRONG_ENCODING 9 /* v2 */ +#define SNMP_ERR_WRONG_VALUE 10 /* v2 */ +#define SNMP_ERR_NO_CREATION 11 /* v2 */ +#define SNMP_ERR_INCONS_VALUE 12 /* v2 */ +#define SNMP_ERR_RES_UNAVAIL 13 /* v2 */ +#define SNMP_ERR_COMMIT_FAILED 14 /* v2 */ +#define SNMP_ERR_UNDO_FAILED 15 /* v2 */ +#define SNMP_ERR_AUTH_ERR 16 /* v2 */ +#define SNMP_ERR_NOT_WRITEABLE 17 /* v2 */ +#define SNMP_ERR_INCONS_NAME 18 /* v2 */ + +#define SNMP_TRAP_COLDSTART 0 +#define SNMP_TRAP_WARMSTART 1 +#define SNMP_TRAP_LINKDOWN 2 +#define SNMP_TRAP_LINKUP 3 +#define SNMP_TRAP_AUTHENTICATION_FAILURE 4 +#define SNMP_TRAP_EGP_NEIGHBOR_LOSS 5 +#define SNMP_TRAP_ENTERPRISE 6 + +enum snmp_code { + SNMP_CODE_OK = 0, + SNMP_CODE_FAILED, + SNMP_CODE_BADVERS, + SNMP_CODE_BADLEN, + SNMP_CODE_BADENC, + SNMP_CODE_OORANGE, +}; + +void snmp_value_free(struct snmp_value *); +int snmp_value_parse(const char *, enum snmp_syntax, union snmp_values *); +int snmp_value_copy(struct snmp_value *, const struct snmp_value *); + +void snmp_pdu_free(struct snmp_pdu *); +enum snmp_code snmp_pdu_decode(struct asn_buf *b, struct snmp_pdu *pdu, int32_t *); +enum snmp_code snmp_pdu_encode(struct snmp_pdu *pdu, struct asn_buf *resp_b); + +int snmp_pdu_snoop(const struct asn_buf *); + +void snmp_pdu_dump(const struct snmp_pdu *pdu); + +extern void (*snmp_error)(const char *, ...); +extern void (*snmp_printf)(const char *, ...); + +#define TRUTH_MK(F) ((F) ? 1 : 2) +#define TRUTH_GET(T) (((T) == 1) ? 1 : 0) +#define TRUTH_OK(T) ((T) == 1 || (T) == 2) + +#endif diff --git a/bsnmp/snmppriv.h b/bsnmp/snmppriv.h new file mode 100644 index 0000000..87ef60e --- /dev/null +++ b/bsnmp/snmppriv.h @@ -0,0 +1,45 @@ +/* + * 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/snmppriv.h,v 1.9 2004/08/06 08:46:58 brandt Exp $ + * + * Private functions. + */ +#include <sys/cdefs.h> + +enum asn_err snmp_binding_encode(struct asn_buf *, const struct snmp_value *); +enum snmp_code snmp_pdu_encode_header(struct asn_buf *, struct snmp_pdu *); +enum snmp_code snmp_fix_encoding(struct asn_buf *, const struct snmp_pdu *); +enum asn_err snmp_parse_message_hdr(struct asn_buf *b, struct snmp_pdu *pdu, + asn_len_t *lenp); +enum asn_err snmp_parse_pdus_hdr(struct asn_buf *b, struct snmp_pdu *pdu, + asn_len_t *lenp); + +#define DEFAULT_HOST "localhost" +#define DEFAULT_PORT "snmp" +#define DEFAULT_LOCAL "/var/run/snmp.sock" |