2 * Copyright (c) 1988-1990 The Regents of the University of California.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that: (1) source code distributions
7 * retain the above copyright notice and this paragraph in its entirety, (2)
8 * distributions including binary code include the above copyright notice and
9 * this paragraph in its entirety in the documentation or other materials
10 * provided with the distribution, and (3) all advertising materials mentioning
11 * features or use of this software display the following acknowledgement:
12 * ``This product includes software developed by the University of California,
13 * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
14 * the University nor the names of its contributors may be used to endorse
15 * or promote products derived from this software without specific prior
17 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
18 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
19 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
21 * Format and print bootp packets.
23 * This file was copied from tcpdump-2.1.1 and modified.
24 * There is an e-mail list for tcpdump: <tcpdump@ee.lbl.gov>
31 #include <sys/param.h>
32 #include <sys/types.h>
33 #include <sys/socket.h>
35 #include <sys/time.h> /* for struct timeval in net/if.h */
37 #include <netinet/in.h>
43 #include "bootptest.h"
45 /* These decode the vendor data. */
47 static void rfc1048_print();
48 static void cmu_print();
49 static void other_print();
50 static void dump_hex();
53 * Print bootp requests
56 bootp_print(bp, length, sport, dport)
61 static char tstr[] = " [|bootp]";
62 static unsigned char vm_cmu[4] = VM_CMU;
63 static unsigned char vm_rfc1048[4] = VM_RFC1048;
67 #define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
69 /* Note funny sized packets */
70 if (length != sizeof(struct bootp))
71 (void) printf(" [len=%d]", length);
73 /* 'ep' points to the end of avaible data. */
74 ep = (u_char *) snapend;
79 /* Usually, a request goes from a client to a server */
80 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
85 /* Usually, a reply goes from a server to a client */
86 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
91 printf(" bootp-#%d", bp->bp_op);
94 /* The usual hardware address type is 1 (10Mb Ethernet) */
95 if (bp->bp_htype != 1)
96 printf(" htype:%d", bp->bp_htype);
98 /* The usual length for 10Mb Ethernet address is 6 bytes */
100 printf(" hlen:%d", bp->bp_hlen);
102 /* Client's Hardware address */
104 register struct ether_header *eh;
107 TCHECK(bp->bp_chaddr[0], 6);
108 eh = (struct ether_header *) packetp;
109 if (bp->bp_op == BOOTREQUEST)
110 e = (char *) ESRC(eh);
111 else if (bp->bp_op == BOOTREPLY)
112 e = (char *) EDST(eh);
115 if (e == 0 || bcmp((char *) bp->bp_chaddr, e, 6))
116 dump_hex(bp->bp_chaddr, bp->bp_hlen);
118 /* Only print interesting fields */
120 printf(" hops:%d", bp->bp_hops);
123 printf(" xid:%ld", (long)ntohl(bp->bp_xid));
126 printf(" secs:%d", ntohs(bp->bp_secs));
128 /* Client's ip address */
129 TCHECK(bp->bp_ciaddr, sizeof(bp->bp_ciaddr));
130 if (bp->bp_ciaddr.s_addr)
131 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
133 /* 'your' ip address (bootp client) */
134 TCHECK(bp->bp_yiaddr, sizeof(bp->bp_yiaddr));
135 if (bp->bp_yiaddr.s_addr)
136 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
138 /* Server's ip address */
139 TCHECK(bp->bp_siaddr, sizeof(bp->bp_siaddr));
140 if (bp->bp_siaddr.s_addr)
141 printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
143 /* Gateway's ip address */
144 TCHECK(bp->bp_giaddr, sizeof(bp->bp_giaddr));
145 if (bp->bp_giaddr.s_addr)
146 printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
148 TCHECK(bp->bp_sname[0], sizeof(bp->bp_sname));
151 if (printfn(bp->bp_sname, ep)) {
152 fputs(tstr + 1, stdout);
156 TCHECK(bp->bp_file[0], sizeof(bp->bp_file));
159 if (printfn(bp->bp_file, ep)) {
160 fputs(tstr + 1, stdout);
164 /* Don't try to decode the vendor buffer unless we're verbose */
168 vdlen = sizeof(bp->bp_vend);
169 /* Vendor data can extend to the end of the packet. */
170 if (vdlen < (ep - bp->bp_vend))
171 vdlen = (ep - bp->bp_vend);
173 TCHECK(bp->bp_vend[0], vdlen);
175 if (!bcmp(bp->bp_vend, vm_rfc1048, sizeof(u_int32)))
176 rfc1048_print(bp->bp_vend, vdlen);
177 else if (!bcmp(bp->bp_vend, vm_cmu, sizeof(u_int32)))
178 cmu_print(bp->bp_vend, vdlen);
180 other_print(bp->bp_vend, vdlen);
189 * Option description data follows.
190 * These are described in: RFC-1048, RFC-1395, RFC-1497, RFC-1533
192 * The first char of each option string encodes the data format:
202 /* Originally from RFC-1048: */
203 "?PAD", /* 0: Padding - special, no data. */
204 "iSM", /* 1: subnet mask (RFC950)*/
205 "lTZ", /* 2: time offset, seconds from UTC */
206 "iGW", /* 3: gateways (or routers) */
207 "iTS", /* 4: time servers (RFC868) */
208 "iINS", /* 5: IEN name servers (IEN116) */
209 "iDNS", /* 6: domain name servers (RFC1035)(1034?) */
210 "iLOG", /* 7: MIT log servers */
211 "iCS", /* 8: cookie servers (RFC865) */
212 "iLPR", /* 9: lpr server (RFC1179) */
213 "iIPS", /* 10: impress servers (Imagen) */
214 "iRLP", /* 11: resource location servers (RFC887) */
215 "aHN", /* 12: host name (ASCII) */
216 "sBFS", /* 13: boot file size (in 512 byte blocks) */
218 /* Added by RFC-1395: */
219 "aDUMP", /* 14: Merit Dump File */
220 "aDNAM", /* 15: Domain Name (for DNS) */
221 "iSWAP", /* 16: Swap Server */
222 "aROOT", /* 17: Root Path */
224 /* Added by RFC-1497: */
225 "aEXTF", /* 18: Extensions Path (more options) */
227 /* Added by RFC-1533: (many, many options...) */
228 #if 1 /* These might not be worth recognizing by name. */
230 /* IP Layer Parameters, per-host (RFC-1533, sect. 4) */
231 "bIP-forward", /* 19: IP Forwarding flag */
232 "bIP-srcroute", /* 20: IP Source Routing Enable flag */
233 "iIP-filters", /* 21: IP Policy Filter (addr pairs) */
234 "sIP-maxudp", /* 22: IP Max-UDP reassembly size */
235 "bIP-ttlive", /* 23: IP Time to Live */
236 "lIP-pmtuage", /* 24: IP Path MTU aging timeout */
237 "sIP-pmtutab", /* 25: IP Path MTU plateau table */
239 /* IP parameters, per-interface (RFC-1533, sect. 5) */
240 "sIP-mtu-sz", /* 26: IP MTU size */
241 "bIP-mtu-sl", /* 27: IP MTU all subnets local */
242 "bIP-bcast1", /* 28: IP Broadcast Addr ones flag */
243 "bIP-mask-d", /* 29: IP do mask discovery */
244 "bIP-mask-s", /* 30: IP do mask supplier */
245 "bIP-rt-dsc", /* 31: IP do router discovery */
246 "iIP-rt-sa", /* 32: IP router solicitation addr */
247 "iIP-routes", /* 33: IP static routes (dst,router) */
249 /* Link Layer parameters, per-interface (RFC-1533, sect. 6) */
250 "bLL-trailer", /* 34: do tralier encapsulation */
251 "lLL-arp-tmo", /* 35: ARP cache timeout */
252 "bLL-ether2", /* 36: Ethernet version 2 (IEEE 802.3) */
254 /* TCP parameters (RFC-1533, sect. 7) */
255 "bTCP-def-ttl", /* 37: default time to live */
256 "lTCP-KA-tmo", /* 38: keepalive time interval */
257 "bTCP-KA-junk", /* 39: keepalive sends extra junk */
259 /* Application and Service Parameters (RFC-1533, sect. 8) */
260 "aNISDOM", /* 40: NIS Domain (Sun YP) */
261 "iNISSRV", /* 41: NIS Servers */
262 "iNTPSRV", /* 42: NTP (time) Servers (RFC 1129) */
263 "?VSINFO", /* 43: Vendor Specific Info (encapsulated) */
264 "iNBiosNS", /* 44: NetBIOS Name Server (RFC-1001,1..2) */
265 "iNBiosDD", /* 45: NetBIOS Datagram Dist. Server. */
266 "bNBiosNT", /* 46: NetBIOS Note Type */
267 "?NBiosS", /* 47: NetBIOS Scope */
268 "iXW-FS", /* 48: X Window System Font Servers */
269 "iXW-DM", /* 49: X Window System Display Managers */
271 /* DHCP extensions (RFC-1533, sect. 9) */
274 #define KNOWN_OPTIONS (sizeof(rfc1048_opts) / sizeof(rfc1048_opts[0]))
277 rfc1048_print(bp, length)
291 /* Step over magic cookie */
293 /* Setup end pointer */
297 /* Check for tags with no data first. */
302 if (tag < KNOWN_OPTIONS) {
303 optstr = rfc1048_opts[tag];
304 printf(" %s:", optstr + 1);
306 printf(" T%d:", tag);
309 /* Now scan the length byte. */
312 /* truncated option */
313 printf(" |(%d>%td)", len, ep - bp);
316 /* Print the option value(s). */
319 case 'a': /* ASCII string */
320 printfn(bp, bp + len);
325 case 's': /* Word formats */
327 bcopy((char *) bp, (char *) &us, 2);
328 printf("%d", ntohs(us));
331 if (len) printf(",");
333 if (len) printf("(junk=%d)", len);
336 case 'l': /* Long words */
338 bcopy((char *) bp, (char *) &ul, 4);
339 printf("%ld", (long)ntohl(ul));
342 if (len) printf(",");
344 if (len) printf("(junk=%d)", len);
347 case 'i': /* INET addresses */
349 bcopy((char *) bp, (char *) &ia, 4);
350 printf("%s", ipaddr_string(&ia));
353 if (len) printf(",");
355 if (len) printf("(junk=%d)", len);
364 /* Print as characters, if appropriate. */
367 if (isascii(*bp) && isprint(*bp)) {
369 printfn(bp, bp + len);
375 } /* while bp < ep */
379 cmu_print(bp, length)
388 v = (struct cmu_vend *) bp;
389 if (length < sizeof(*v)) {
390 printf(" |L=%d", length);
393 /* Setup end pointer */
397 if (v->v_flags & VF_SMASK) {
398 printf(" SM:%s", ipaddr_string(&v->v_smask));
400 /* Default gateway */
401 if (v->v_dgate.s_addr)
402 printf(" GW:%s", ipaddr_string(&v->v_dgate));
404 /* Domain name servers */
405 if (v->v_dns1.s_addr)
406 printf(" DNS1:%s", ipaddr_string(&v->v_dns1));
407 if (v->v_dns2.s_addr)
408 printf(" DNS2:%s", ipaddr_string(&v->v_dns2));
410 /* IEN-116 name servers */
411 if (v->v_ins1.s_addr)
412 printf(" INS1:%s", ipaddr_string(&v->v_ins1));
413 if (v->v_ins2.s_addr)
414 printf(" INS2:%s", ipaddr_string(&v->v_ins2));
418 printf(" TS1:%s", ipaddr_string(&v->v_ts1));
420 printf(" TS2:%s", ipaddr_string(&v->v_ts2));
426 * Print out arbitrary, unknown vendor data.
430 other_print(bp, length)
434 u_char *ep; /* end pointer */
435 u_char *zp; /* points one past last non-zero byte */
437 /* Setup end pointer */
440 /* Find the last non-zero byte. */
441 for (zp = ep; zp > bp; zp--) {
446 /* Print the all-zero case in a compact representation. */
453 /* Are there enough trailing zeros to make "00..." worthwhile? */
455 zp = ep; /* print them all normally */
457 /* Now just print all the non-zero data. */
459 printf(".%02X", *bp);
478 if (len) printf(".");
486 * c-argdecl-indent: 4
487 * c-continued-statement-offset: 4
488 * c-continued-brace-offset: -4