forked from osmocom/wireshark
![Peter Wu](/assets/img/avatar_default.png)
atof is locale-dependent. In locales such as Swedish, German and Dutch, the dot is a thousand separator, resulting in wrong conversions for floats. While at it, make the mate dissector also be independent of locale. Blacklist atof in checkAPIs. Lemon is still using strtod, but that is not our problem for now. Bug: 11297 Bug: 8964 Change-Id: I6fe3e45eb1d6d95d41aa4f3af1f81a6204a60c63 Reviewed-on: https://code.wireshark.org/review/9116 Reviewed-by: Alexis La Goutte <alexis.lagoutte@gmail.com> Petri-Dish: Alexis La Goutte <alexis.lagoutte@gmail.com> Petri-Dish: Gerald Combs <gerald@wireshark.org> Reviewed-by: Anders Broman <a.broman58@gmail.com>
300 lines
7.2 KiB
C
300 lines
7.2 KiB
C
/* asn1.c
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* Common routines for ASN.1
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* 2007 Anders Broman
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*
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* Wireshark - Network traffic analyzer
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* By Gerald Combs <gerald@wireshark.org>
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* Copyright 1998 Gerald Combs
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License
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* as published by the Free Software Foundation; either version 2
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* of the License, or (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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*/
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#include "config.h"
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#include <glib.h>
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#include <string.h>
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#include <stdlib.h>
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#include <math.h>
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#include <epan/packet.h>
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#include "asn1.h"
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void asn1_ctx_init(asn1_ctx_t *actx, asn1_enc_e encoding, gboolean aligned, packet_info *pinfo) {
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memset(actx, '\0', sizeof(*actx));
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actx->signature = ASN1_CTX_SIGNATURE;
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actx->encoding = encoding;
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actx->aligned = aligned;
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actx->pinfo = pinfo;
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}
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gboolean asn1_ctx_check_signature(asn1_ctx_t *actx) {
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return actx && (actx->signature == ASN1_CTX_SIGNATURE);
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}
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void asn1_ctx_clean_external(asn1_ctx_t *actx) {
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memset(&actx->external, '\0', sizeof(actx->external));
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actx->external.hf_index = -1;
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actx->external.encoding = -1;
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}
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void asn1_ctx_clean_epdv(asn1_ctx_t *actx) {
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memset(&actx->embedded_pdv, '\0', sizeof(actx->embedded_pdv));
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actx->embedded_pdv.hf_index = -1;
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actx->embedded_pdv.identification = -1;
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}
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/*--- stack/parameters ---*/
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void asn1_stack_frame_push(asn1_ctx_t *actx, const gchar *name) {
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asn1_stack_frame_t *frame;
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frame = wmem_new0(wmem_packet_scope(), asn1_stack_frame_t);
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frame->name = name;
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frame->next = actx->stack;
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actx->stack = frame;
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}
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void asn1_stack_frame_pop(asn1_ctx_t *actx, const gchar *name) {
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DISSECTOR_ASSERT(actx->stack);
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DISSECTOR_ASSERT(!strcmp(actx->stack->name, name));
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actx->stack = actx->stack->next;
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}
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void asn1_stack_frame_check(asn1_ctx_t *actx, const gchar *name, const asn1_par_def_t *par_def) {
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const asn1_par_def_t *pd = par_def;
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asn1_par_t *par;
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DISSECTOR_ASSERT(actx->stack);
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DISSECTOR_ASSERT(!strcmp(actx->stack->name, name));
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par = actx->stack->par;
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while (pd->name) {
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DISSECTOR_ASSERT(par);
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DISSECTOR_ASSERT((pd->ptype == ASN1_PAR_IRR) || (par->ptype == pd->ptype));
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par->name = pd->name;
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pd++;
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par = par->next;
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}
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DISSECTOR_ASSERT(!par);
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}
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static asn1_par_t *get_par_by_name(asn1_ctx_t *actx, const gchar *name) {
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asn1_par_t *par = NULL;
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DISSECTOR_ASSERT(actx->stack);
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par = actx->stack->par;
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while (par) {
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if (!strcmp(par->name, name))
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return par;
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par = par->next;
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}
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return par;
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}
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static asn1_par_t *push_new_par(asn1_ctx_t *actx) {
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asn1_par_t *par, **pp;
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DISSECTOR_ASSERT(actx->stack);
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par = wmem_new0(wmem_packet_scope(), asn1_par_t);
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pp = &(actx->stack->par);
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while (*pp)
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pp = &((*pp)->next);
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*pp = par;
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return par;
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}
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void asn1_param_push_boolean(asn1_ctx_t *actx, gboolean value) {
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asn1_par_t *par;
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par = push_new_par(actx);
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par->ptype = ASN1_PAR_BOOLEAN;
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par->value.v_boolean = value;
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}
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void asn1_param_push_integer(asn1_ctx_t *actx, gint32 value) {
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asn1_par_t *par;
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par = push_new_par(actx);
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par->ptype = ASN1_PAR_INTEGER;
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par->value.v_integer = value;
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}
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gboolean asn1_param_get_boolean(asn1_ctx_t *actx, const gchar *name) {
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asn1_par_t *par = NULL;
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par = get_par_by_name(actx, name);
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DISSECTOR_ASSERT(par);
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return par->value.v_boolean;
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}
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gint32 asn1_param_get_integer(asn1_ctx_t *actx, const gchar *name) {
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asn1_par_t *par = NULL;
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par = get_par_by_name(actx, name);
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DISSECTOR_ASSERT(par);
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return par->value.v_integer;
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}
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/*--- ROSE ---*/
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void rose_ctx_init(rose_ctx_t *rctx) {
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memset(rctx, '\0', sizeof(*rctx));
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rctx->signature = ROSE_CTX_SIGNATURE;
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}
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gboolean rose_ctx_check_signature(rose_ctx_t *rctx) {
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return rctx && (rctx->signature == ROSE_CTX_SIGNATURE);
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}
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void rose_ctx_clean_data(rose_ctx_t *rctx) {
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memset(&rctx->d, '\0', sizeof(rctx->d));
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rctx->d.code = -1;
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}
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asn1_ctx_t *get_asn1_ctx(void *ptr) {
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asn1_ctx_t *actx = (asn1_ctx_t*)ptr;
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if (!asn1_ctx_check_signature(actx))
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actx = NULL;
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return actx;
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}
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rose_ctx_t *get_rose_ctx(void *ptr) {
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rose_ctx_t *rctx = (rose_ctx_t*)ptr;
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asn1_ctx_t *actx = (asn1_ctx_t*)ptr;
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if (!asn1_ctx_check_signature(actx))
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actx = NULL;
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if (actx)
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rctx = actx->rose_ctx;
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if (!rose_ctx_check_signature(rctx))
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rctx = NULL;
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return rctx;
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}
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/** Only tested for BER */
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double asn1_get_real(const guint8 *real_ptr, gint len) {
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guint8 octet;
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const guint8 *p;
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guint8 *buf;
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double val = 0;
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/* 8.5.2 If the real value is the value zero,
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* there shall be no contents octets in the encoding.
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*/
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if (len < 1) return val;
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octet = real_ptr[0];
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p = real_ptr + 1;
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len -= 1;
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if (octet & 0x80) { /* binary encoding */
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int i;
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gboolean Eneg;
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gint8 S; /* Sign */
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guint8 B; /* Base */
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guint8 F; /* scaling Factor */
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gint32 E = 0; /* Exponent (supported max 3 octets/24 bit) */
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guint64 N = 0; /* N (supported max 8 octets/64 bit) */
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guint8 lenE, lenN;
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if(octet & 0x40) S = -1; else S = 1;
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switch(octet & 0x30) {
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case 0x00: B = 2; break;
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case 0x10: B = 8; break;
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case 0x20: B = 16; break;
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case 0x30: /* Reserved */
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default:
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/* TODO Add some warning in tree about reserved value for Base */
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return 0;
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}
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F = (octet & 0x0c) >> 2;
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/* 8.5.6.4 Exponent length */
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lenE = (octet & 0x3) + 1;
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if(lenE == 4)
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{
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/* we can't handle exponents > 24 bits */
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/* TODO Next octet(s) define length of exponent */
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DISSECTOR_ASSERT_NOT_REACHED();
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}
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Eneg = (*p) & 0x80 ? TRUE : FALSE;
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for (i = 0; i < lenE; i++) {
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if(Eneg) {
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/* 2's complement: inverse bits */
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E = (E<<8) | ((guint8) ~(*p));
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} else {
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E = (E<<8) | *p;
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}
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p++;
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}
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if(Eneg) {
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/* 2's complement: ... and add 1 (and make negative of course) */
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E = -(E + 1);
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}
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lenN = len - lenE;
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if(lenN > 8)
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{
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/* we can't handle integers > 64 bits */
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DISSECTOR_ASSERT_NOT_REACHED();
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}
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for (i=0; i<lenN; i++) {
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N = (N<<8) | *p;
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p++;
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}
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val = (double) S * N * pow(2, F) * pow(B, E);
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#ifdef DEBUG
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printf("S = %d, N = %lu, F = %u, B = %u, E = %d -> %f\n", S, N, F, B, E, Eneg, val);
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#endif
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} else if (octet & 0x40) { /* SpecialRealValue */
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switch (octet & 0x3F) {
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case 0x00: val = HUGE_VAL; break;
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case 0x01: val = -HUGE_VAL; break;
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}
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} else { /* decimal encoding */
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buf = g_strndup(p, len);
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val = g_ascii_strtod(buf, NULL);
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g_free(buf);
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}
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return val;
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}
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/*
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* Editor modelines - http://www.wireshark.org/tools/modelines.html
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*
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* Local Variables:
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* c-basic-offset: 2
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* tab-width: 8
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* indent-tabs-mode: nil
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* End:
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*
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* ex: set shiftwidth=2 tabstop=8 expandtab:
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* :indentSize=2:tabSize=8:noTabs=true:
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*/
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