2 * Copyright (c) 2013 The TCPDUMP project
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28 /* \summary: Ad Hoc Configuration Protocol (AHCP) printer */
30 /* Based on draft-chroboczek-ahcp-00 and source code of ahcpd-0.53 */
36 #include <netdissect-stdinc.h>
38 #include "netdissect.h"
40 #include "addrtoname.h"
42 static const char tstr[] = " [|ahcp]";
44 #define AHCP_MAGIC_NUMBER 43
45 #define AHCP_VERSION_1 1
46 #define AHCP1_HEADER_FIX_LEN 24
47 #define AHCP1_BODY_MIN_LEN 4
49 #define AHCP1_MSG_DISCOVER 0
50 #define AHCP1_MSG_OFFER 1
51 #define AHCP1_MSG_REQUEST 2
52 #define AHCP1_MSG_ACK 3
53 #define AHCP1_MSG_NACK 4
54 #define AHCP1_MSG_RELEASE 5
56 static const struct tok ahcp1_msg_str[] = {
57 { AHCP1_MSG_DISCOVER, "Discover" },
58 { AHCP1_MSG_OFFER, "Offer" },
59 { AHCP1_MSG_REQUEST, "Request" },
60 { AHCP1_MSG_ACK, "Ack" },
61 { AHCP1_MSG_NACK, "Nack" },
62 { AHCP1_MSG_RELEASE, "Release" },
66 #define AHCP1_OPT_PAD 0
67 #define AHCP1_OPT_MANDATORY 1
68 #define AHCP1_OPT_ORIGIN_TIME 2
69 #define AHCP1_OPT_EXPIRES 3
70 #define AHCP1_OPT_MY_IPV6_ADDRESS 4
71 #define AHCP1_OPT_MY_IPV4_ADDRESS 5
72 #define AHCP1_OPT_IPV6_PREFIX 6
73 #define AHCP1_OPT_IPV4_PREFIX 7
74 #define AHCP1_OPT_IPV6_ADDRESS 8
75 #define AHCP1_OPT_IPV4_ADDRESS 9
76 #define AHCP1_OPT_IPV6_PREFIX_DELEGATION 10
77 #define AHCP1_OPT_IPV4_PREFIX_DELEGATION 11
78 #define AHCP1_OPT_NAME_SERVER 12
79 #define AHCP1_OPT_NTP_SERVER 13
80 #define AHCP1_OPT_MAX 13
82 static const struct tok ahcp1_opt_str[] = {
83 { AHCP1_OPT_PAD, "Pad" },
84 { AHCP1_OPT_MANDATORY, "Mandatory" },
85 { AHCP1_OPT_ORIGIN_TIME, "Origin Time" },
86 { AHCP1_OPT_EXPIRES, "Expires" },
87 { AHCP1_OPT_MY_IPV6_ADDRESS, "My-IPv6-Address" },
88 { AHCP1_OPT_MY_IPV4_ADDRESS, "My-IPv4-Address" },
89 { AHCP1_OPT_IPV6_PREFIX, "IPv6 Prefix" },
90 { AHCP1_OPT_IPV4_PREFIX, "IPv4 Prefix" },
91 { AHCP1_OPT_IPV6_ADDRESS, "IPv6 Address" },
92 { AHCP1_OPT_IPV4_ADDRESS, "IPv4 Address" },
93 { AHCP1_OPT_IPV6_PREFIX_DELEGATION, "IPv6 Prefix Delegation" },
94 { AHCP1_OPT_IPV4_PREFIX_DELEGATION, "IPv4 Prefix Delegation" },
95 { AHCP1_OPT_NAME_SERVER, "Name Server" },
96 { AHCP1_OPT_NTP_SERVER, "NTP Server" },
101 ahcp_time_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
110 t = EXTRACT_32BITS(cp);
111 if (NULL == (tm = gmtime(&t)))
112 ND_PRINT((ndo, ": gmtime() error"));
113 else if (0 == strftime(buf, sizeof(buf), "%Y-%m-%d %H:%M:%S", tm))
114 ND_PRINT((ndo, ": strftime() error"));
116 ND_PRINT((ndo, ": %s UTC", buf));
120 ND_PRINT((ndo, "%s", istr));
121 ND_TCHECK2(*cp, ep - cp);
124 ND_PRINT((ndo, "%s", tstr));
129 ahcp_seconds_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
134 ND_PRINT((ndo, ": %us", EXTRACT_32BITS(cp)));
138 ND_PRINT((ndo, "%s", istr));
139 ND_TCHECK2(*cp, ep - cp);
142 ND_PRINT((ndo, "%s", tstr));
147 ahcp_ipv6_addresses_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
149 const char *sep = ": ";
155 ND_PRINT((ndo, "%s%s", sep, ip6addr_string(ndo, cp)));
162 ND_PRINT((ndo, "%s", istr));
163 ND_TCHECK2(*cp, ep - cp);
166 ND_PRINT((ndo, "%s", tstr));
171 ahcp_ipv4_addresses_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
173 const char *sep = ": ";
179 ND_PRINT((ndo, "%s%s", sep, ipaddr_string(ndo, cp)));
186 ND_PRINT((ndo, "%s", istr));
187 ND_TCHECK2(*cp, ep - cp);
190 ND_PRINT((ndo, "%s", tstr));
195 ahcp_ipv6_prefixes_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
197 const char *sep = ": ";
203 ND_PRINT((ndo, "%s%s/%u", sep, ip6addr_string(ndo, cp), *(cp + 16)));
210 ND_PRINT((ndo, "%s", istr));
211 ND_TCHECK2(*cp, ep - cp);
214 ND_PRINT((ndo, "%s", tstr));
219 ahcp_ipv4_prefixes_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
221 const char *sep = ": ";
227 ND_PRINT((ndo, "%s%s/%u", sep, ipaddr_string(ndo, cp), *(cp + 4)));
234 ND_PRINT((ndo, "%s", istr));
235 ND_TCHECK2(*cp, ep - cp);
238 ND_PRINT((ndo, "%s", tstr));
242 /* Data decoders signal truncated data with -1. */
244 (* const data_decoders[AHCP1_OPT_MAX + 1])(netdissect_options *, const u_char *, const u_char *) = {
245 /* [AHCP1_OPT_PAD] = */ NULL,
246 /* [AHCP1_OPT_MANDATORY] = */ NULL,
247 /* [AHCP1_OPT_ORIGIN_TIME] = */ ahcp_time_print,
248 /* [AHCP1_OPT_EXPIRES] = */ ahcp_seconds_print,
249 /* [AHCP1_OPT_MY_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
250 /* [AHCP1_OPT_MY_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
251 /* [AHCP1_OPT_IPV6_PREFIX] = */ ahcp_ipv6_prefixes_print,
252 /* [AHCP1_OPT_IPV4_PREFIX] = */ NULL,
253 /* [AHCP1_OPT_IPV6_ADDRESS] = */ ahcp_ipv6_addresses_print,
254 /* [AHCP1_OPT_IPV4_ADDRESS] = */ ahcp_ipv4_addresses_print,
255 /* [AHCP1_OPT_IPV6_PREFIX_DELEGATION] = */ ahcp_ipv6_prefixes_print,
256 /* [AHCP1_OPT_IPV4_PREFIX_DELEGATION] = */ ahcp_ipv4_prefixes_print,
257 /* [AHCP1_OPT_NAME_SERVER] = */ ahcp_ipv6_addresses_print,
258 /* [AHCP1_OPT_NTP_SERVER] = */ ahcp_ipv6_addresses_print,
262 ahcp1_options_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
264 uint8_t option_no, option_len;
271 ND_PRINT((ndo, "\n\t %s", tok2str(ahcp1_opt_str, "Unknown-%u", option_no)));
272 if (option_no == AHCP1_OPT_PAD || option_no == AHCP1_OPT_MANDATORY)
280 if (cp + option_len > ep)
283 if (option_no <= AHCP1_OPT_MAX && data_decoders[option_no] != NULL) {
284 if (data_decoders[option_no](ndo, cp, cp + option_len) < 0)
285 break; /* truncated and already marked up */
287 ND_PRINT((ndo, " (Length %u)", option_len));
288 ND_TCHECK2(*cp, option_len);
295 ND_PRINT((ndo, "%s", istr));
296 ND_TCHECK2(*cp, ep - cp);
299 ND_PRINT((ndo, "%s", tstr));
303 ahcp1_body_print(netdissect_options *ndo, const u_char *cp, const u_char *ep)
308 if (cp + AHCP1_BODY_MIN_LEN > ep)
320 body_len = EXTRACT_16BITS(cp);
323 if (ndo->ndo_vflag) {
324 ND_PRINT((ndo, "\n\t%s", tok2str(ahcp1_msg_str, "Unknown-%u", type)));
326 ND_PRINT((ndo, ", MBZ %u", mbz));
327 ND_PRINT((ndo, ", Length %u", body_len));
329 if (cp + body_len > ep)
333 if (ndo->ndo_vflag >= 2)
334 ahcp1_options_print(ndo, cp, cp + body_len); /* not ep (ignore extra data) */
336 ND_TCHECK2(*cp, body_len);
340 ND_PRINT((ndo, "%s", istr));
341 ND_TCHECK2(*cp, ep - cp);
344 ND_PRINT((ndo, "%s", tstr));
348 ahcp_print(netdissect_options *ndo, const u_char *cp, const u_int len)
350 const u_char *ep = cp + len;
353 ND_PRINT((ndo, "AHCP"));
358 if (*cp != AHCP_MAGIC_NUMBER)
366 case AHCP_VERSION_1: {
367 ND_PRINT((ndo, " Version 1"));
368 if (len < AHCP1_HEADER_FIX_LEN)
370 if (!ndo->ndo_vflag) {
371 ND_TCHECK2(*cp, AHCP1_HEADER_FIX_LEN - 2);
372 cp += AHCP1_HEADER_FIX_LEN - 2;
376 ND_PRINT((ndo, "\n\tHopcount %u", *cp));
378 /* Original Hopcount */
380 ND_PRINT((ndo, ", Original Hopcount %u", *cp));
384 ND_PRINT((ndo, ", Nonce 0x%08x", EXTRACT_32BITS(cp)));
388 ND_PRINT((ndo, ", Source Id %s", linkaddr_string(ndo, cp, 0, 8)));
392 ND_PRINT((ndo, ", Destination Id %s", linkaddr_string(ndo, cp, 0, 8)));
396 ahcp1_body_print(ndo, cp, ep);
400 ND_PRINT((ndo, " Version %u (unknown)", version));
406 ND_PRINT((ndo, "%s", istr));
407 ND_TCHECK2(*cp, ep - cp);
410 ND_PRINT((ndo, "%s", tstr));