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freebsd-skq/contrib/bsnmp/lib/asn1.c
Hartmut Brandt 70af00a124 Virgin import of bsnmpd 1.5a
2004-01-23 10:44:47 +00:00

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/*
* 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/lib/asn1.c,v 1.27 2003/12/08 17:11:58 hbb Exp $
*
* ASN.1 for SNMP.
*/
#include <sys/types.h>
#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <inttypes.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)
{
u_int64_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];
u_int64_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 = (u_int64_t)-(ival + 1);
neg = 1;
} else
val = (u_int64_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, u_int64_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, u_int64_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, u_int32_t *vp)
{
u_int64_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 = (u_int32_t)v;
}
return (err);
}
enum asn_err
asn_put_uint32(struct asn_buf *b, u_char type, u_int32_t val)
{
u_int64_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, u_int64_t *vp)
{
return (asn_get_real_unsigned(b, len, vp));
}
enum asn_err
asn_put_counter64(struct asn_buf *b, u_int64_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, u_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_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, u_int32_t val)
{
u_int64_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");
}
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