2 * Copyright (c) 1988-1990
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that:
7 * 1. Source code distributions retain the above copyright
8 * notice and this paragraph in its entirety
9 * 2. Distributions including binary code include the above copyright
10 * notice and this paragraph in its entirety in the documentation
11 * or other materials provided with the distribution, and
12 * 3. Neither the name of the University nor the names of its contributors
13 * may be used to endorse or promote products derived from this software
14 * without specific prior written permission.
16 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
17 * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
18 * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
20 * Format and print bootp packets.
22 * This file was copied from tcpdump-2.1.1 and modified.
23 * There is an e-mail list for tcpdump: <tcpdump@ee.lbl.gov>
30 #include <sys/param.h>
31 #include <sys/types.h>
32 #include <sys/socket.h>
34 #include <sys/time.h> /* for struct timeval in net/if.h */
36 #include <netinet/in.h>
42 #include "bootptest.h"
44 /* These decode the vendor data. */
46 static void rfc1048_print();
47 static void cmu_print();
48 static void other_print();
49 static void dump_hex();
52 * Print bootp requests
55 bootp_print(bp, length, sport, dport)
60 static char tstr[] = " [|bootp]";
61 static unsigned char vm_cmu[4] = VM_CMU;
62 static unsigned char vm_rfc1048[4] = VM_RFC1048;
66 #define TCHECK(var, l) if ((u_char *)&(var) > ep - l) goto trunc
68 /* Note funny sized packets */
69 if (length != sizeof(struct bootp))
70 (void) printf(" [len=%d]", length);
72 /* 'ep' points to the end of avaible data. */
73 ep = (u_char *) snapend;
78 /* Usually, a request goes from a client to a server */
79 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
84 /* Usually, a reply goes from a server to a client */
85 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
90 printf(" bootp-#%d", bp->bp_op);
93 /* The usual hardware address type is 1 (10Mb Ethernet) */
94 if (bp->bp_htype != 1)
95 printf(" htype:%d", bp->bp_htype);
97 /* The usual length for 10Mb Ethernet address is 6 bytes */
99 printf(" hlen:%d", bp->bp_hlen);
101 /* Client's Hardware address */
103 register struct ether_header *eh;
106 TCHECK(bp->bp_chaddr[0], 6);
107 eh = (struct ether_header *) packetp;
108 if (bp->bp_op == BOOTREQUEST)
109 e = (char *) ESRC(eh);
110 else if (bp->bp_op == BOOTREPLY)
111 e = (char *) EDST(eh);
114 if (e == 0 || bcmp((char *) bp->bp_chaddr, e, 6))
115 dump_hex(bp->bp_chaddr, bp->bp_hlen);
117 /* Only print interesting fields */
119 printf(" hops:%d", bp->bp_hops);
122 printf(" xid:%ld", (long)ntohl(bp->bp_xid));
125 printf(" secs:%d", ntohs(bp->bp_secs));
127 /* Client's ip address */
128 TCHECK(bp->bp_ciaddr, sizeof(bp->bp_ciaddr));
129 if (bp->bp_ciaddr.s_addr)
130 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
132 /* 'your' ip address (bootp client) */
133 TCHECK(bp->bp_yiaddr, sizeof(bp->bp_yiaddr));
134 if (bp->bp_yiaddr.s_addr)
135 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
137 /* Server's ip address */
138 TCHECK(bp->bp_siaddr, sizeof(bp->bp_siaddr));
139 if (bp->bp_siaddr.s_addr)
140 printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
142 /* Gateway's ip address */
143 TCHECK(bp->bp_giaddr, sizeof(bp->bp_giaddr));
144 if (bp->bp_giaddr.s_addr)
145 printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
147 TCHECK(bp->bp_sname[0], sizeof(bp->bp_sname));
150 if (printfn(bp->bp_sname, ep)) {
151 fputs(tstr + 1, stdout);
155 TCHECK(bp->bp_file[0], sizeof(bp->bp_file));
158 if (printfn(bp->bp_file, ep)) {
159 fputs(tstr + 1, stdout);
163 /* Don't try to decode the vendor buffer unless we're verbose */
167 vdlen = sizeof(bp->bp_vend);
168 /* Vendor data can extend to the end of the packet. */
169 if (vdlen < (ep - bp->bp_vend))
170 vdlen = (ep - bp->bp_vend);
172 TCHECK(bp->bp_vend[0], vdlen);
174 if (!bcmp(bp->bp_vend, vm_rfc1048, sizeof(u_int32)))
175 rfc1048_print(bp->bp_vend, vdlen);
176 else if (!bcmp(bp->bp_vend, vm_cmu, sizeof(u_int32)))
177 cmu_print(bp->bp_vend, vdlen);
179 other_print(bp->bp_vend, vdlen);
188 * Option description data follows.
189 * These are decribed in: RFC-1048, RFC-1395, RFC-1497, RFC-1533
191 * The first char of each option string encodes the data format:
201 /* Originally from RFC-1048: */
202 "?PAD", /* 0: Padding - special, no data. */
203 "iSM", /* 1: subnet mask (RFC950)*/
204 "lTZ", /* 2: time offset, seconds from UTC */
205 "iGW", /* 3: gateways (or routers) */
206 "iTS", /* 4: time servers (RFC868) */
207 "iINS", /* 5: IEN name servers (IEN116) */
208 "iDNS", /* 6: domain name servers (RFC1035)(1034?) */
209 "iLOG", /* 7: MIT log servers */
210 "iCS", /* 8: cookie servers (RFC865) */
211 "iLPR", /* 9: lpr server (RFC1179) */
212 "iIPS", /* 10: impress servers (Imagen) */
213 "iRLP", /* 11: resource location servers (RFC887) */
214 "aHN", /* 12: host name (ASCII) */
215 "sBFS", /* 13: boot file size (in 512 byte blocks) */
217 /* Added by RFC-1395: */
218 "aDUMP", /* 14: Merit Dump File */
219 "aDNAM", /* 15: Domain Name (for DNS) */
220 "iSWAP", /* 16: Swap Server */
221 "aROOT", /* 17: Root Path */
223 /* Added by RFC-1497: */
224 "aEXTF", /* 18: Extensions Path (more options) */
226 /* Added by RFC-1533: (many, many options...) */
227 #if 1 /* These might not be worth recognizing by name. */
229 /* IP Layer Parameters, per-host (RFC-1533, sect. 4) */
230 "bIP-forward", /* 19: IP Forwarding flag */
231 "bIP-srcroute", /* 20: IP Source Routing Enable flag */
232 "iIP-filters", /* 21: IP Policy Filter (addr pairs) */
233 "sIP-maxudp", /* 22: IP Max-UDP reassembly size */
234 "bIP-ttlive", /* 23: IP Time to Live */
235 "lIP-pmtuage", /* 24: IP Path MTU aging timeout */
236 "sIP-pmtutab", /* 25: IP Path MTU plateau table */
238 /* IP parameters, per-interface (RFC-1533, sect. 5) */
239 "sIP-mtu-sz", /* 26: IP MTU size */
240 "bIP-mtu-sl", /* 27: IP MTU all subnets local */
241 "bIP-bcast1", /* 28: IP Broadcast Addr ones flag */
242 "bIP-mask-d", /* 29: IP do mask discovery */
243 "bIP-mask-s", /* 30: IP do mask supplier */
244 "bIP-rt-dsc", /* 31: IP do router discovery */
245 "iIP-rt-sa", /* 32: IP router solicitation addr */
246 "iIP-routes", /* 33: IP static routes (dst,router) */
248 /* Link Layer parameters, per-interface (RFC-1533, sect. 6) */
249 "bLL-trailer", /* 34: do tralier encapsulation */
250 "lLL-arp-tmo", /* 35: ARP cache timeout */
251 "bLL-ether2", /* 36: Ethernet version 2 (IEEE 802.3) */
253 /* TCP parameters (RFC-1533, sect. 7) */
254 "bTCP-def-ttl", /* 37: default time to live */
255 "lTCP-KA-tmo", /* 38: keepalive time interval */
256 "bTCP-KA-junk", /* 39: keepalive sends extra junk */
258 /* Application and Service Parameters (RFC-1533, sect. 8) */
259 "aNISDOM", /* 40: NIS Domain (Sun YP) */
260 "iNISSRV", /* 41: NIS Servers */
261 "iNTPSRV", /* 42: NTP (time) Servers (RFC 1129) */
262 "?VSINFO", /* 43: Vendor Specific Info (encapsulated) */
263 "iNBiosNS", /* 44: NetBIOS Name Server (RFC-1001,1..2) */
264 "iNBiosDD", /* 45: NetBIOS Datagram Dist. Server. */
265 "bNBiosNT", /* 46: NetBIOS Note Type */
266 "?NBiosS", /* 47: NetBIOS Scope */
267 "iXW-FS", /* 48: X Window System Font Servers */
268 "iXW-DM", /* 49: X Window System Display Managers */
270 /* DHCP extensions (RFC-1533, sect. 9) */
273 #define KNOWN_OPTIONS (sizeof(rfc1048_opts) / sizeof(rfc1048_opts[0]))
276 rfc1048_print(bp, length)
290 /* Step over magic cookie */
292 /* Setup end pointer */
296 /* Check for tags with no data first. */
301 if (tag < KNOWN_OPTIONS) {
302 optstr = rfc1048_opts[tag];
303 printf(" %s:", optstr + 1);
305 printf(" T%d:", tag);
308 /* Now scan the length byte. */
311 /* truncated option */
312 printf(" |(%d>%td)", len, ep - bp);
315 /* Print the option value(s). */
318 case 'a': /* ASCII string */
319 printfn(bp, bp + len);
324 case 's': /* Word formats */
326 bcopy((char *) bp, (char *) &us, 2);
327 printf("%d", ntohs(us));
330 if (len) printf(",");
332 if (len) printf("(junk=%d)", len);
335 case 'l': /* Long words */
337 bcopy((char *) bp, (char *) &ul, 4);
338 printf("%ld", (long)ntohl(ul));
341 if (len) printf(",");
343 if (len) printf("(junk=%d)", len);
346 case 'i': /* INET addresses */
348 bcopy((char *) bp, (char *) &ia, 4);
349 printf("%s", ipaddr_string(&ia));
352 if (len) printf(",");
354 if (len) printf("(junk=%d)", len);
363 /* Print as characters, if appropriate. */
366 if (isascii(*bp) && isprint(*bp)) {
368 printfn(bp, bp + len);
374 } /* while bp < ep */
378 cmu_print(bp, length)
387 v = (struct cmu_vend *) bp;
388 if (length < sizeof(*v)) {
389 printf(" |L=%d", length);
392 /* Setup end pointer */
396 if (v->v_flags & VF_SMASK) {
397 printf(" SM:%s", ipaddr_string(&v->v_smask));
399 /* Default gateway */
400 if (v->v_dgate.s_addr)
401 printf(" GW:%s", ipaddr_string(&v->v_dgate));
403 /* Domain name servers */
404 if (v->v_dns1.s_addr)
405 printf(" DNS1:%s", ipaddr_string(&v->v_dns1));
406 if (v->v_dns2.s_addr)
407 printf(" DNS2:%s", ipaddr_string(&v->v_dns2));
409 /* IEN-116 name servers */
410 if (v->v_ins1.s_addr)
411 printf(" INS1:%s", ipaddr_string(&v->v_ins1));
412 if (v->v_ins2.s_addr)
413 printf(" INS2:%s", ipaddr_string(&v->v_ins2));
417 printf(" TS1:%s", ipaddr_string(&v->v_ts1));
419 printf(" TS2:%s", ipaddr_string(&v->v_ts2));
425 * Print out arbitrary, unknown vendor data.
429 other_print(bp, length)
433 u_char *ep; /* end pointer */
434 u_char *zp; /* points one past last non-zero byte */
436 /* Setup end pointer */
439 /* Find the last non-zero byte. */
440 for (zp = ep; zp > bp; zp--) {
445 /* Print the all-zero case in a compact representation. */
452 /* Are there enough trailing zeros to make "00..." worthwhile? */
454 zp = ep; /* print them all normally */
456 /* Now just print all the non-zero data. */
458 printf(".%02X", *bp);
477 if (len) printf(".");
485 * c-argdecl-indent: 4
486 * c-continued-statement-offset: 4
487 * c-continued-brace-offset: -4