forked from osmocom/wireshark
![Guy Harris](/assets/img/avatar_default.png)
include of <resolv.h> in any system header file gets the system <resolv.h> (needed for builds on Tru64 with GTK+ 1.2[.x]). svn path=/trunk/; revision=11615
360 lines
10 KiB
C
360 lines
10 KiB
C
/* packet-ipsec.c
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* Routines for IPsec/IPComp packet disassembly
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*
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* $Id$
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@ethereal.com>
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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., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*/
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#ifdef HAVE_CONFIG_H
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# include "config.h"
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#endif
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#include <stdio.h>
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#include <string.h>
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#include <glib.h>
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#include <epan/packet.h>
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#include "packet-ipsec.h"
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#include <epan/addr_resolv.h>
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#include "ipproto.h"
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#include "prefs.h"
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/* Place AH payload in sub tree */
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static gboolean g_ah_payload_in_subtree = FALSE;
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static int proto_ah = -1;
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static int hf_ah_spi = -1;
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static int hf_ah_sequence = -1;
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static int proto_esp = -1;
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static int hf_esp_spi = -1;
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static int hf_esp_sequence = -1;
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static int proto_ipcomp = -1;
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static int hf_ipcomp_flags = -1;
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static int hf_ipcomp_cpi = -1;
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static gint ett_ah = -1;
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static gint ett_esp = -1;
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static gint ett_ipcomp = -1;
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static dissector_handle_t data_handle;
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static dissector_table_t ip_dissector_table;
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struct newah {
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guint8 ah_nxt; /* Next Header */
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guint8 ah_len; /* Length of data + 1, in 32bit */
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guint16 ah_reserve; /* Reserved for future use */
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guint32 ah_spi; /* Security parameter index */
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guint32 ah_seq; /* Sequence number field */
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/* variable size, 32bit bound*/ /* Authentication data */
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};
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struct newesp {
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guint32 esp_spi; /* ESP */
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guint32 esp_seq; /* Sequence number */
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/*variable size*/ /* (IV and) Payload data */
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/*variable size*/ /* padding */
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/*8bit*/ /* pad size */
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/*8bit*/ /* next header */
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/*8bit*/ /* next header */
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/*variable size, 32bit bound*/ /* Authentication data */
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};
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struct ipcomp {
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guint8 comp_nxt; /* Next Header */
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guint8 comp_flags; /* Must be zero */
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guint16 comp_cpi; /* Compression parameter index */
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};
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/* well-known algorithm number (in CPI), from RFC2409 */
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#define IPCOMP_OUI 1 /* vendor specific */
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#define IPCOMP_DEFLATE 2 /* RFC2394 */
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#define IPCOMP_LZS 3 /* RFC2395 */
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#define IPCOMP_MAX 4
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static const value_string cpi2val[] = {
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{ IPCOMP_OUI, "OUI" },
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{ IPCOMP_DEFLATE, "DEFLATE" },
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{ IPCOMP_LZS, "LZS" },
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{ 0, NULL },
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};
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#ifndef offsetof
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#define offsetof(type, member) ((size_t)(&((type *)0)->member))
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#endif
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static void
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dissect_ah(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *next_tree;
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guint8 nxt;
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tvbuff_t *next_tvb;
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int advance;
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advance = dissect_ah_header(tvb, pinfo, tree, &nxt, &next_tree);
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next_tvb = tvb_new_subset(tvb, advance, -1, -1);
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if (g_ah_payload_in_subtree) {
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col_set_writable(pinfo->cinfo, FALSE);
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}
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/* do lookup with the subdissector table */
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if (!dissector_try_port(ip_dissector_table, nxt, next_tvb, pinfo, next_tree)) {
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call_dissector(data_handle,next_tvb, pinfo, next_tree);
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}
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}
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int
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dissect_ah_header(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree,
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guint8 *nxt_p, proto_tree **next_tree_p)
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{
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proto_tree *ah_tree;
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proto_item *ti;
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struct newah ah;
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int advance;
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "AH");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&ah, 0, sizeof(ah));
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advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "AH (SPI=0x%08x)",
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(guint32)g_ntohl(ah.ah_spi));
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}
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if (tree) {
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/* !!! specify length */
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ti = proto_tree_add_item(tree, proto_ah, tvb, 0, advance, FALSE);
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ah_tree = proto_item_add_subtree(ti, ett_ah);
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proto_tree_add_text(ah_tree, tvb,
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offsetof(struct newah, ah_nxt), 1,
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"Next Header: %s (0x%02x)",
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ipprotostr(ah.ah_nxt), ah.ah_nxt);
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proto_tree_add_text(ah_tree, tvb,
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offsetof(struct newah, ah_len), 1,
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"Length: %u", (ah.ah_len + 2) << 2);
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proto_tree_add_uint(ah_tree, hf_ah_spi, tvb,
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offsetof(struct newah, ah_spi), 4,
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(guint32)g_ntohl(ah.ah_spi));
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proto_tree_add_uint(ah_tree, hf_ah_sequence, tvb,
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offsetof(struct newah, ah_seq), 4,
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(guint32)g_ntohl(ah.ah_seq));
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proto_tree_add_text(ah_tree, tvb,
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sizeof(ah), (ah.ah_len - 1) << 2,
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"ICV");
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if (next_tree_p != NULL) {
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/* Decide where to place next protocol decode */
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if (g_ah_payload_in_subtree) {
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*next_tree_p = ah_tree;
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}
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else {
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*next_tree_p = tree;
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}
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}
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} else {
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if (next_tree_p != NULL)
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*next_tree_p = NULL;
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}
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if (nxt_p != NULL)
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*nxt_p = ah.ah_nxt;
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/* start of the new header (could be a extension header) */
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return advance;
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}
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static void
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dissect_esp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *esp_tree;
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proto_item *ti;
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struct newesp esp;
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/*
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* load the top pane info. This should be overwritten by
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* the next protocol in the stack
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*/
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "ESP");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&esp, 0, sizeof(esp));
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if (check_col(pinfo->cinfo, COL_INFO)) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "ESP (SPI=0x%08x)",
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(guint32)g_ntohl(esp.esp_spi));
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}
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/*
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* populate a tree in the second pane with the status of the link layer
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* (ie none)
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*/
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if(tree) {
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ti = proto_tree_add_item(tree, proto_esp, tvb, 0, -1, FALSE);
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esp_tree = proto_item_add_subtree(ti, ett_esp);
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proto_tree_add_uint(esp_tree, hf_esp_spi, tvb,
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offsetof(struct newesp, esp_spi), 4,
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(guint32)g_ntohl(esp.esp_spi));
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proto_tree_add_uint(esp_tree, hf_esp_sequence, tvb,
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offsetof(struct newesp, esp_seq), 4,
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(guint32)g_ntohl(esp.esp_seq));
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call_dissector(data_handle,
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tvb_new_subset(tvb, sizeof(struct newesp), -1, -1),
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pinfo, esp_tree);
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}
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}
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static void
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dissect_ipcomp(tvbuff_t *tvb, packet_info *pinfo, proto_tree *tree)
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{
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proto_tree *ipcomp_tree;
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proto_item *ti;
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struct ipcomp ipcomp;
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char *p;
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/*
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* load the top pane info. This should be overwritten by
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* the next protocol in the stack
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*/
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if (check_col(pinfo->cinfo, COL_PROTOCOL))
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col_set_str(pinfo->cinfo, COL_PROTOCOL, "IPComp");
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if (check_col(pinfo->cinfo, COL_INFO))
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col_clear(pinfo->cinfo, COL_INFO);
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tvb_memcpy(tvb, (guint8 *)&ipcomp, 0, sizeof(ipcomp));
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if (check_col(pinfo->cinfo, COL_INFO)) {
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p = match_strval(g_ntohs(ipcomp.comp_cpi), cpi2val);
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if (p == NULL) {
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col_add_fstr(pinfo->cinfo, COL_INFO, "IPComp (CPI=0x%04x)",
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g_ntohs(ipcomp.comp_cpi));
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} else
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col_add_fstr(pinfo->cinfo, COL_INFO, "IPComp (CPI=%s)", p);
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}
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/*
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* populate a tree in the second pane with the status of the link layer
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* (ie none)
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*/
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if (tree) {
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ti = proto_tree_add_item(tree, proto_ipcomp, tvb, 0, -1, FALSE);
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ipcomp_tree = proto_item_add_subtree(ti, ett_ipcomp);
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proto_tree_add_text(ipcomp_tree, tvb,
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offsetof(struct ipcomp, comp_nxt), 1,
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"Next Header: %s (0x%02x)",
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ipprotostr(ipcomp.comp_nxt), ipcomp.comp_nxt);
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proto_tree_add_uint(ipcomp_tree, hf_ipcomp_flags, tvb,
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offsetof(struct ipcomp, comp_flags), 1,
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ipcomp.comp_flags);
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proto_tree_add_uint(ipcomp_tree, hf_ipcomp_cpi, tvb,
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offsetof(struct ipcomp, comp_cpi), 2,
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g_ntohs(ipcomp.comp_cpi));
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call_dissector(data_handle,
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tvb_new_subset(tvb, sizeof(struct ipcomp), -1, -1), pinfo,
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ipcomp_tree);
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}
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}
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void
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proto_register_ipsec(void)
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{
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static hf_register_info hf_ah[] = {
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{ &hf_ah_spi,
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{ "SPI", "ah.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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{ &hf_ah_sequence,
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{ "Sequence", "ah.sequence", FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }}
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};
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static hf_register_info hf_esp[] = {
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{ &hf_esp_spi,
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{ "SPI", "esp.spi", FT_UINT32, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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{ &hf_esp_sequence,
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{ "Sequence", "esp.sequence", FT_UINT32, BASE_DEC, NULL, 0x0,
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"", HFILL }}
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};
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static hf_register_info hf_ipcomp[] = {
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{ &hf_ipcomp_flags,
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{ "Flags", "ipcomp.flags", FT_UINT8, BASE_HEX, NULL, 0x0,
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"", HFILL }},
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{ &hf_ipcomp_cpi,
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{ "CPI", "ipcomp.cpi", FT_UINT16, BASE_HEX,
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VALS(cpi2val), 0x0, "", HFILL }},
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};
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static gint *ett[] = {
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&ett_ah,
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&ett_esp,
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&ett_ipcomp,
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};
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module_t *ah_module;
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proto_ah = proto_register_protocol("Authentication Header", "AH", "ah");
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proto_register_field_array(proto_ah, hf_ah, array_length(hf_ah));
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proto_esp = proto_register_protocol("Encapsulating Security Payload",
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"ESP", "esp");
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proto_register_field_array(proto_esp, hf_esp, array_length(hf_esp));
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proto_ipcomp = proto_register_protocol("IP Payload Compression",
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"IPComp", "ipcomp");
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proto_register_field_array(proto_ipcomp, hf_ipcomp, array_length(hf_ipcomp));
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proto_register_subtree_array(ett, array_length(ett));
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/* Register a configuration option for placement of AH payload dissection */
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ah_module = prefs_register_protocol(proto_ah, NULL);
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prefs_register_bool_preference(ah_module, "place_ah_payload_in_subtree",
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"Place AH payload in subtree",
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"Whether the AH payload decode should be placed in a subtree",
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&g_ah_payload_in_subtree);
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register_dissector("esp", dissect_esp, proto_esp);
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register_dissector("ah", dissect_ah, proto_ah);
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}
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void
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proto_reg_handoff_ipsec(void)
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{
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dissector_handle_t esp_handle, ah_handle, ipcomp_handle;
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data_handle = find_dissector("data");
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ah_handle = find_dissector("ah");
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dissector_add("ip.proto", IP_PROTO_AH, ah_handle);
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esp_handle = find_dissector("esp");
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dissector_add("ip.proto", IP_PROTO_ESP, esp_handle);
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ipcomp_handle = create_dissector_handle(dissect_ipcomp, proto_ipcomp);
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dissector_add("ip.proto", IP_PROTO_IPCOMP, ipcomp_handle);
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ip_dissector_table = find_dissector_table("ip.proto");
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}
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