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-rw-r--r--print-ahcp.c384
1 files changed, 384 insertions, 0 deletions
diff --git a/print-ahcp.c b/print-ahcp.c
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+/*
+ * Copyright (c) 2013 The TCPDUMP project
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
+ * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
+ * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
+ * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
+ * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
+ * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
+ * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+/* \summary: Ad Hoc Configuration Protocol (AHCP) printer */
+
+/* Based on draft-chroboczek-ahcp-00 and source code of ahcpd-0.53 */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include "netdissect-stdinc.h"
+
+#define ND_LONGJMP_FROM_TCHECK
+#include "netdissect.h"
+#include "extract.h"
+#include "addrtoname.h"
+
+
+#define AHCP_MAGIC_NUMBER 43
+#define AHCP_VERSION_1 1
+#define AHCP1_HEADER_FIX_LEN 24
+#define AHCP1_BODY_MIN_LEN 4
+
+#define AHCP1_MSG_DISCOVER 0
+#define AHCP1_MSG_OFFER 1
+#define AHCP1_MSG_REQUEST 2
+#define AHCP1_MSG_ACK 3
+#define AHCP1_MSG_NACK 4
+#define AHCP1_MSG_RELEASE 5
+
+static const struct tok ahcp1_msg_str[] = {
+ { AHCP1_MSG_DISCOVER, "Discover" },
+ { AHCP1_MSG_OFFER, "Offer" },
+ { AHCP1_MSG_REQUEST, "Request" },
+ { AHCP1_MSG_ACK, "Ack" },
+ { AHCP1_MSG_NACK, "Nack" },
+ { AHCP1_MSG_RELEASE, "Release" },
+ { 0, NULL }
+};
+
+#define AHCP1_OPT_PAD 0
+#define AHCP1_OPT_MANDATORY 1
+#define AHCP1_OPT_ORIGIN_TIME 2
+#define AHCP1_OPT_EXPIRES 3
+#define AHCP1_OPT_MY_IPV6_ADDRESS 4
+#define AHCP1_OPT_MY_IPV4_ADDRESS 5
+#define AHCP1_OPT_IPV6_PREFIX 6
+#define AHCP1_OPT_IPV4_PREFIX 7
+#define AHCP1_OPT_IPV6_ADDRESS 8
+#define AHCP1_OPT_IPV4_ADDRESS 9
+#define AHCP1_OPT_IPV6_PREFIX_DELEGATION 10
+#define AHCP1_OPT_IPV4_PREFIX_DELEGATION 11
+#define AHCP1_OPT_NAME_SERVER 12
+#define AHCP1_OPT_NTP_SERVER 13
+#define AHCP1_OPT_MAX 13
+
+static const struct tok ahcp1_opt_str[] = {
+ { AHCP1_OPT_PAD, "Pad" },
+ { AHCP1_OPT_MANDATORY, "Mandatory" },
+ { AHCP1_OPT_ORIGIN_TIME, "Origin Time" },
+ { AHCP1_OPT_EXPIRES, "Expires" },
+ { AHCP1_OPT_MY_IPV6_ADDRESS, "My-IPv6-Address" },
+ { AHCP1_OPT_MY_IPV4_ADDRESS, "My-IPv4-Address" },
+ { AHCP1_OPT_IPV6_PREFIX, "IPv6 Prefix" },
+ { AHCP1_OPT_IPV4_PREFIX, "IPv4 Prefix" },
+ { AHCP1_OPT_IPV6_ADDRESS, "IPv6 Address" },
+ { AHCP1_OPT_IPV4_ADDRESS, "IPv4 Address" },
+ { AHCP1_OPT_IPV6_PREFIX_DELEGATION, "IPv6 Prefix Delegation" },
+ { AHCP1_OPT_IPV4_PREFIX_DELEGATION, "IPv4 Prefix Delegation" },
+ { AHCP1_OPT_NAME_SERVER, "Name Server" },
+ { AHCP1_OPT_NTP_SERVER, "NTP Server" },
+ { 0, NULL }
+};
+
+static void
+ahcp_time_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ time_t t;
+ char buf[sizeof("-yyyyyyyyyy-mm-dd hh:mm:ss UTC")];
+
+ if (len != 4)
+ goto invalid;
+ t = GET_BE_U_4(cp);
+ ND_PRINT(": %s",
+ nd_format_time(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S UTC",
+ gmtime(&t)));
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp_seconds_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ if (len != 4)
+ goto invalid;
+ ND_PRINT(": %us", GET_BE_U_4(cp));
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp_ipv6_addresses_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ const char *sep = ": ";
+
+ while (len) {
+ if (len < 16)
+ goto invalid;
+ ND_PRINT("%s%s", sep, GET_IP6ADDR_STRING(cp));
+ cp += 16;
+ len -= 16;
+ sep = ", ";
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp_ipv4_addresses_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ const char *sep = ": ";
+
+ while (len) {
+ if (len < 4)
+ goto invalid;
+ ND_PRINT("%s%s", sep, GET_IPADDR_STRING(cp));
+ cp += 4;
+ len -= 4;
+ sep = ", ";
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp_ipv6_prefixes_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ const char *sep = ": ";
+
+ while (len) {
+ if (len < 17)
+ goto invalid;
+ ND_PRINT("%s%s/%u", sep, GET_IP6ADDR_STRING(cp), GET_U_1(cp + 16));
+ cp += 17;
+ len -= 17;
+ sep = ", ";
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp_ipv4_prefixes_print(netdissect_options *ndo,
+ const u_char *cp, uint8_t len)
+{
+ const char *sep = ": ";
+
+ while (len) {
+ if (len < 5)
+ goto invalid;
+ ND_PRINT("%s%s/%u", sep, GET_IPADDR_STRING(cp), GET_U_1(cp + 4));
+ cp += 5;
+ len -= 5;
+ sep = ", ";
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+(* const data_decoders[AHCP1_OPT_MAX + 1])(netdissect_options *, const u_char *, uint8_t) = {
+ /* [AHCP1_OPT_PAD] = */ NULL,
+ /* [AHCP1_OPT_MANDATORY] = */ NULL,
+ /* [AHCP1_OPT_ORIGIN_TIME] = */ ahcp_time_print,
+ /* [AHCP1_OPT_EXPIRES] = */ ahcp_seconds_print,
+ /* [AHCP1_OPT_MY_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
+ /* [AHCP1_OPT_MY_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
+ /* [AHCP1_OPT_IPV6_PREFIX] = */ ahcp_ipv6_prefixes_print,
+ /* [AHCP1_OPT_IPV4_PREFIX] = */ NULL,
+ /* [AHCP1_OPT_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
+ /* [AHCP1_OPT_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
+ /* [AHCP1_OPT_IPV6_PREFIX_DELEGATION] = */ ahcp_ipv6_prefixes_print,
+ /* [AHCP1_OPT_IPV4_PREFIX_DELEGATION] = */ ahcp_ipv4_prefixes_print,
+ /* [AHCP1_OPT_NAME_SERVER] = */ ahcp_ipv6_addresses_print,
+ /* [AHCP1_OPT_NTP_SERVER] = */ ahcp_ipv6_addresses_print,
+};
+
+static void
+ahcp1_options_print(netdissect_options *ndo,
+ const u_char *cp, uint16_t len)
+{
+ while (len) {
+ uint8_t option_no, option_len;
+
+ /* Option no */
+ option_no = GET_U_1(cp);
+ cp += 1;
+ len -= 1;
+ ND_PRINT("\n\t %s", tok2str(ahcp1_opt_str, "Unknown-%u", option_no));
+ if (option_no == AHCP1_OPT_PAD || option_no == AHCP1_OPT_MANDATORY)
+ continue;
+ /* Length */
+ if (!len)
+ goto invalid;
+ option_len = GET_U_1(cp);
+ cp += 1;
+ len -= 1;
+ if (option_len > len)
+ goto invalid;
+ /* Value */
+ if (option_no <= AHCP1_OPT_MAX && data_decoders[option_no] != NULL) {
+ data_decoders[option_no](ndo, cp, option_len);
+ } else {
+ ND_PRINT(" (Length %u)", option_len);
+ ND_TCHECK_LEN(cp, option_len);
+ }
+ cp += option_len;
+ len -= option_len;
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}
+
+static void
+ahcp1_body_print(netdissect_options *ndo,
+ const u_char *cp, u_int len)
+{
+ uint8_t type, mbz;
+ uint16_t body_len;
+
+ if (len < AHCP1_BODY_MIN_LEN)
+ goto invalid;
+ /* Type */
+ type = GET_U_1(cp);
+ cp += 1;
+ len -= 1;
+ /* MBZ */
+ mbz = GET_U_1(cp);
+ cp += 1;
+ len -= 1;
+ /* Length */
+ body_len = GET_BE_U_2(cp);
+ cp += 2;
+ len -= 2;
+
+ if (ndo->ndo_vflag) {
+ ND_PRINT("\n\t%s", tok2str(ahcp1_msg_str, "Unknown-%u", type));
+ if (mbz != 0)
+ ND_PRINT(", MBZ %u", mbz);
+ ND_PRINT(", Length %u", body_len);
+ }
+ if (body_len > len)
+ goto invalid;
+
+ /* Options */
+ /* Here use "body_len", not "len" (ignore any extra data). */
+ if (ndo->ndo_vflag >= 2)
+ ahcp1_options_print(ndo, cp, body_len);
+ else
+ ND_TCHECK_LEN(cp, body_len);
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+
+}
+
+void
+ahcp_print(netdissect_options *ndo,
+ const u_char *cp, u_int len)
+{
+ uint8_t version;
+
+ ndo->ndo_protocol = "ahcp";
+ nd_print_protocol_caps(ndo);
+ if (len < 2)
+ goto invalid;
+ /* Magic */
+ if (GET_U_1(cp) != AHCP_MAGIC_NUMBER)
+ goto invalid;
+ cp += 1;
+ len -= 1;
+ /* Version */
+ version = GET_U_1(cp);
+ cp += 1;
+ len -= 1;
+ switch (version) {
+ case AHCP_VERSION_1: {
+ ND_PRINT(" Version 1");
+ if (len < AHCP1_HEADER_FIX_LEN - 2)
+ goto invalid;
+ if (!ndo->ndo_vflag) {
+ ND_TCHECK_LEN(cp, AHCP1_HEADER_FIX_LEN - 2);
+ cp += AHCP1_HEADER_FIX_LEN - 2;
+ len -= AHCP1_HEADER_FIX_LEN - 2;
+ } else {
+ /* Hopcount */
+ ND_PRINT("\n\tHopcount %u", GET_U_1(cp));
+ cp += 1;
+ len -= 1;
+ /* Original Hopcount */
+ ND_PRINT(", Original Hopcount %u", GET_U_1(cp));
+ cp += 1;
+ len -= 1;
+ /* Nonce */
+ ND_PRINT(", Nonce 0x%08x", GET_BE_U_4(cp));
+ cp += 4;
+ len -= 4;
+ /* Source Id */
+ ND_PRINT(", Source Id %s", GET_LINKADDR_STRING(cp, LINKADDR_OTHER, 8));
+ cp += 8;
+ len -= 8;
+ /* Destination Id */
+ ND_PRINT(", Destination Id %s", GET_LINKADDR_STRING(cp, LINKADDR_OTHER, 8));
+ cp += 8;
+ len -= 8;
+ }
+ /* Body */
+ ahcp1_body_print(ndo, cp, len);
+ break;
+ }
+ default:
+ ND_PRINT(" Version %u (unknown)", version);
+ ND_TCHECK_LEN(cp, len);
+ break;
+ }
+ return;
+
+invalid:
+ nd_print_invalid(ndo);
+ ND_TCHECK_LEN(cp, len);
+}