forked from osmocom/wireshark
339 lines
10 KiB
C
339 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: packet-ipsec.c,v 1.17 2000/06/05 03:21:02 gram Exp $
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*
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* Ethereal - Network traffic analyzer
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* By Gerald Combs <gerald@zing.org>
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* Copyright 1998 Gerald Combs
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*
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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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#ifdef HAVE_SYS_TYPES_H
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# include <sys/types.h>
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#endif
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#ifdef HAVE_NETINET_IN_H
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# include <netinet/in.h>
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#endif
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#include <glib.h>
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#include "packet.h"
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#include "packet-ipsec.h"
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#include "packet-ip.h"
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#include "resolv.h"
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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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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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int
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dissect_ah_old(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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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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memcpy(&ah, (void *) &pd[offset], sizeof(ah));
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advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "AH");
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "AH (SPI=0x%08x)",
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(guint32)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, NullTVB, offset, 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, NullTVB, offset + offsetof(struct newah, ah_nxt), 1,
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"Next Header: %s (0x%02x)", ipprotostr(ah.ah_nxt), ah.ah_nxt);
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proto_tree_add_text(ah_tree, NullTVB, offset + offsetof(struct newah, ah_len), 1,
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"Length: %d", ah.ah_len << 2);
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proto_tree_add_uint(ah_tree, hf_ah_spi, NullTVB,
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offset + offsetof(struct newah, ah_spi), 4,
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(guint32)ntohl(ah.ah_spi));
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proto_tree_add_uint(ah_tree, hf_ah_sequence, NullTVB,
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offset + offsetof(struct newah, ah_seq), 4,
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(guint32)ntohl(ah.ah_seq));
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proto_tree_add_text(ah_tree, NullTVB, offset + sizeof(ah), (ah.ah_len - 1) << 2,
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"ICV");
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}
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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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void
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dissect_ah(const u_char *pd, int offset, frame_data *fd, proto_tree *tree)
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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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memcpy(&ah, (void *) &pd[offset], sizeof(ah));
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advance = sizeof(ah) + ((ah.ah_len - 1) << 2);
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if (check_col(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "AH");
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "AH (SPI=0x%08x)",
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(guint32)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, NullTVB, offset, 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, NullTVB, offset + offsetof(struct newah, ah_nxt), 1,
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"Next Header: %s (0x%02x)", ipprotostr(ah.ah_nxt), ah.ah_nxt);
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proto_tree_add_text(ah_tree, NullTVB, offset + offsetof(struct newah, ah_len), 1,
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"Length: %d", ah.ah_len << 2);
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proto_tree_add_uint(ah_tree, hf_ah_spi, NullTVB,
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offset + offsetof(struct newah, ah_spi), 4,
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(guint32)ntohl(ah.ah_spi));
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proto_tree_add_uint(ah_tree, hf_ah_sequence, NullTVB,
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offset + offsetof(struct newah, ah_seq), 4,
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(guint32)ntohl(ah.ah_seq));
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proto_tree_add_text(ah_tree, NullTVB, offset + sizeof(ah), (ah.ah_len - 1) << 2,
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"ICV");
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}
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/* start of the new header (could be a extension header) */
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offset += advance;
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/* do lookup with the subdissector table */
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if (!dissector_try_port(ip_dissector_table, ah.ah_nxt, pd, offset, fd, tree)) {
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dissect_data(pd, offset, fd, tree);
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}
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}
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static void
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dissect_esp(const u_char *pd, int offset, frame_data *fd, 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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memcpy(&esp, (void *) &pd[offset], sizeof(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(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "ESP");
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if (check_col(fd, COL_INFO)) {
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col_add_fstr(fd, COL_INFO, "ESP (SPI=0x%08x)",
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(guint32)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, NullTVB, offset, END_OF_FRAME, 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, NullTVB,
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offset + offsetof(struct newesp, esp_spi), 4,
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(guint32)ntohl(esp.esp_spi));
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proto_tree_add_uint(esp_tree, hf_esp_sequence, NullTVB,
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offset + offsetof(struct newesp, esp_seq), 4,
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(guint32)ntohl(esp.esp_seq));
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dissect_data(pd, offset + sizeof(struct newesp), fd, esp_tree);
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}
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}
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static void
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dissect_ipcomp(const u_char *pd, int offset, frame_data *fd, 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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memcpy(&ipcomp, (void *) &pd[offset], sizeof(ipcomp));
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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(fd, COL_PROTOCOL))
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col_add_str(fd, COL_PROTOCOL, "IPComp");
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if (check_col(fd, COL_INFO)) {
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p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
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if (p[0] == '\0') {
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col_add_fstr(fd, COL_INFO, "IPComp (CPI=0x%04x)",
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ntohs(ipcomp.comp_cpi));
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} else
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col_add_fstr(fd, 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, NullTVB, offset, END_OF_FRAME,
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FALSE);
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ipcomp_tree = proto_item_add_subtree(ti, ett_ipcomp);
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proto_tree_add_text(ipcomp_tree, NullTVB,
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offset + 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, NullTVB,
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offset + offsetof(struct ipcomp, comp_flags), 1,
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ipcomp.comp_flags);
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p = val_to_str(ntohs(ipcomp.comp_cpi), cpi2val, "");
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if (p[0] == '\0') {
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proto_tree_add_uint(ipcomp_tree, hf_ipcomp_cpi, NullTVB,
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offset + offsetof(struct ipcomp, comp_cpi), 2,
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ntohs(ipcomp.comp_cpi));
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} else {
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proto_tree_add_uint_format(ipcomp_tree, hf_ipcomp_cpi, NullTVB,
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offset + offsetof(struct ipcomp, comp_cpi), 2,
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ntohs(ipcomp.comp_cpi),
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"CPI: %s (0x%04x)",
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p, ntohs(ipcomp.comp_cpi));
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}
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dissect_data(pd, offset + sizeof(struct ipcomp), fd, 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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"" }},
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{ &hf_ah_sequence,
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{ "Sequence", "ah.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
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"" }}
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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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"" }},
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{ &hf_esp_sequence,
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{ "Sequence", "esp.sequence", FT_UINT32, BASE_HEX, NULL, 0x0,
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"" }}
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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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"" }},
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{ &hf_ipcomp_cpi,
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{ "CPI", "ipcomp.cpi", FT_UINT16, BASE_HEX, NULL, 0x0,
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"" }},
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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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proto_ah = proto_register_protocol("Authentication Header", "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("Encapsulated Security Payload", "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", "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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}
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void
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proto_reg_handoff_ipsec(void)
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{
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dissector_add("ip.proto", IP_PROTO_AH, dissect_ah);
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dissector_add("ip.proto", IP_PROTO_ESP, dissect_esp);
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dissector_add("ip.proto", IP_PROTO_IPCOMP, dissect_ipcomp);
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}
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