The Tcpdump Group git mirrors - tcpdump/blob - print-bootp.c

   1 /*
   2  * Copyright (c) 1990, 1991, 1993, 1994, 1995, 1996, 1997
   3  *      The Regents of the University of California.  All rights reserved.
   4  *
   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
  16  * written permission.
  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.
  20  *
  21  * Format and print bootp packets.
  22  */
  23 #ifndef lint
  24 static const char rcsid[] =
  25     "@(#) $Header: /tcpdump/master/tcpdump/print-bootp.c,v 1.49 2000-07-01 03:39:01 assar Exp $ (LBL)";
  26 #endif
  27
  28 #ifdef HAVE_CONFIG_H
  29 #include "config.h"
  30 #endif
  31
  32 #include <sys/param.h>
  33 #include <sys/time.h>
  34 #include <sys/socket.h>
  35
  36 struct mbuf;
  37 struct rtentry;
  38 #include <net/if.h>
  39
  40 #include <netinet/in.h>
  41 #include <netinet/if_ether.h>
  42
  43 #include <ctype.h>
  44 #include <stdio.h>
  45 #include <string.h>
  46
  47 #include "interface.h"
  48 #include "addrtoname.h"
  49 #include "bootp.h"
  50
  51 static void rfc1048_print(const u_char *, u_int);
  52 static void cmu_print(const u_char *, u_int);
  53
  54 static char tstr[] = " [|bootp]";
  55
  56 /*
  57  * Print bootp requests
  58  */
  59 void
  60 bootp_print(register const u_char *cp, u_int length,
  61             u_short sport, u_short dport)
  62 {
  63         register const struct bootp *bp;
  64         static u_char vm_cmu[4] = VM_CMU;
  65         static u_char vm_rfc1048[4] = VM_RFC1048;
  66
  67         bp = (struct bootp *)cp;
  68         TCHECK(bp->bp_op);
  69         switch (bp->bp_op) {
  70
  71         case BOOTREQUEST:
  72                 /* Usually, a request goes from a client to a server */
  73                 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
  74                         printf(" (request)");
  75                 break;
  76
  77         case BOOTREPLY:
  78                 /* Usually, a reply goes from a server to a client */
  79                 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
  80                         printf(" (reply)");
  81                 break;
  82
  83         default:
  84                 printf(" bootp-#%d", bp->bp_op);
  85         }
  86
  87         TCHECK(bp->bp_secs);
  88
  89         /* The usual hardware address type is 1 (10Mb Ethernet) */
  90         if (bp->bp_htype != 1)
  91                 printf(" htype-#%d", bp->bp_htype);
  92
  93         /* The usual length for 10Mb Ethernet address is 6 bytes */
  94         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
  95                 printf(" hlen:%d", bp->bp_hlen);
  96
  97         /* Only print interesting fields */
  98         if (bp->bp_hops)
  99                 printf(" hops:%d", bp->bp_hops);
 100         if (bp->bp_xid)
 101                 printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid));
 102         if (bp->bp_secs)
 103                 printf(" secs:%d", ntohs(bp->bp_secs));
 104         if (bp->bp_flags)
 105                 printf(" flags:0x%x", ntohs(bp->bp_flags));
 106
 107         /* Client's ip address */
 108         TCHECK(bp->bp_ciaddr);
 109         if (bp->bp_ciaddr.s_addr)
 110                 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
 111
 112         /* 'your' ip address (bootp client) */
 113         TCHECK(bp->bp_yiaddr);
 114         if (bp->bp_yiaddr.s_addr)
 115                 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
 116
 117         /* Server's ip address */
 118         TCHECK(bp->bp_siaddr);
 119         if (bp->bp_siaddr.s_addr)
 120                 printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
 121
 122         /* Gateway's ip address */
 123         TCHECK(bp->bp_giaddr);
 124         if (bp->bp_giaddr.s_addr)
 125                 printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
 126
 127         /* Client's Ethernet address */
 128         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 129                 register const struct ether_header *eh;
 130                 register const char *e;
 131
 132                 TCHECK2(bp->bp_chaddr[0], 6);
 133                 eh = (struct ether_header *)packetp;
 134                 if (bp->bp_op == BOOTREQUEST)
 135                         e = (const char *)ESRC(eh);
 136                 else if (bp->bp_op == BOOTREPLY)
 137                         e = (const char *)EDST(eh);
 138                 else
 139                         e = 0;
 140                 if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0)
 141                         printf(" ether %s", etheraddr_string(bp->bp_chaddr));
 142         }
 143
 144         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 145         if (*bp->bp_sname) {
 146                 printf(" sname \"");
 147                 if (fn_print(bp->bp_sname, snapend)) {
 148                         putchar('"');
 149                         fputs(tstr + 1, stdout);
 150                         return;
 151                 }
 152                 putchar('"');
 153         }
 154         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 155         if (*bp->bp_file) {
 156                 printf(" file \"");
 157                 if (fn_print(bp->bp_file, snapend)) {
 158                         putchar('"');
 159                         fputs(tstr + 1, stdout);
 160                         return;
 161                 }
 162                 putchar('"');
 163         }
 164
 165         /* Decode the vendor buffer */
 166         TCHECK(bp->bp_vend[0]);
 167         length -= sizeof(*bp) - sizeof(bp->bp_vend);
 168         if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048,
 169                  sizeof(u_int32_t)) == 0)
 170                 rfc1048_print(bp->bp_vend, length);
 171         else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu,
 172                       sizeof(u_int32_t)) == 0)
 173                 cmu_print(bp->bp_vend, length);
 174         else {
 175                 u_int32_t ul;
 176
 177                 memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul));
 178                 if (ul != 0)
 179                         printf("vend-#0x%x", ul);
 180         }
 181
 182         return;
 183 trunc:
 184         fputs(tstr, stdout);
 185 }
 186
 187 /* The first character specifies the format to print */
 188 static struct tok tag2str[] = {
 189 /* RFC1048 tags */
 190         { TAG_PAD,              " PAD" },
 191         { TAG_SUBNET_MASK,      "iSM" },        /* subnet mask (RFC950) */
 192         { TAG_TIME_OFFSET,      "lTZ" },        /* seconds from UTC */
 193         { TAG_GATEWAY,          "iDG" },        /* default gateway */
 194         { TAG_TIME_SERVER,      "iTS" },        /* time servers (RFC868) */
 195         { TAG_NAME_SERVER,      "iIEN" },       /* IEN name servers (IEN116) */
 196         { TAG_DOMAIN_SERVER,    "iNS" },        /* domain name (RFC1035) */
 197         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 198         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 199         { TAG_LPR_SERVER,       "iLPR" },       /* lpr server (RFC1179) */
 200         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 201         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 202         { TAG_HOSTNAME,         "aHN" },        /* ascii hostname */
 203         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 204         { TAG_END,              " END" },
 205 /* RFC1497 tags */
 206         { TAG_DUMPPATH,         "aDP" },
 207         { TAG_DOMAINNAME,       "aDN" },
 208         { TAG_SWAP_SERVER,      "iSS" },
 209         { TAG_ROOTPATH,         "aRP" },
 210         { TAG_EXTPATH,          "aEP" },
 211 /* RFC2132 tags */
 212         { TAG_IP_FORWARD,       "BIPF" },
 213         { TAG_NL_SRCRT,         "BSRT" },
 214         { TAG_PFILTERS,         "pPF" },
 215         { TAG_REASS_SIZE,       "sRSZ" },
 216         { TAG_DEF_TTL,          "bTTL" },
 217         { TAG_MTU_TIMEOUT,      "lMA" },
 218         { TAG_MTU_TABLE,        "sMT" },
 219         { TAG_INT_MTU,          "sMTU" },
 220         { TAG_LOCAL_SUBNETS,    "BLSN" },
 221         { TAG_BROAD_ADDR,       "iBR" },
 222         { TAG_DO_MASK_DISC,     "BMD" },
 223         { TAG_SUPPLY_MASK,      "BMS" },
 224         { TAG_DO_RDISC,         "BRD" },
 225         { TAG_RTR_SOL_ADDR,     "iRSA" },
 226         { TAG_STATIC_ROUTE,     "pSR" },
 227         { TAG_USE_TRAILERS,     "BUT" },
 228         { TAG_ARP_TIMEOUT,      "lAT" },
 229         { TAG_ETH_ENCAP,        "BIE" },
 230         { TAG_TCP_TTL,          "bTT" },
 231         { TAG_TCP_KEEPALIVE,    "lKI" },
 232         { TAG_KEEPALIVE_GO,     "BKG" },
 233         { TAG_NIS_DOMAIN,       "aYD" },
 234         { TAG_NIS_SERVERS,      "iYS" },
 235         { TAG_NTP_SERVERS,      "iNTP" },
 236         { TAG_VENDOR_OPTS,      "bVO" },
 237         { TAG_NETBIOS_NS,       "iWNS" },
 238         { TAG_NETBIOS_DDS,      "iWDD" },
 239         { TAG_NETBIOS_NODE,     "bWNT" },
 240         { TAG_NETBIOS_SCOPE,    "aWSC" },
 241         { TAG_XWIN_FS,          "iXFS" },
 242         { TAG_XWIN_DM,          "iXDM" },
 243         { TAG_NIS_P_DOMAIN,     "sN+D" },
 244         { TAG_NIS_P_SERVERS,    "iN+S" },
 245         { TAG_MOBILE_HOME,      "iMH" },
 246         { TAG_SMPT_SERVER,      "iSMTP" },
 247         { TAG_POP3_SERVER,      "iPOP3" },
 248         { TAG_NNTP_SERVER,      "iNNTP" },
 249         { TAG_WWW_SERVER,       "iWWW" },
 250         { TAG_FINGER_SERVER,    "iFG" },
 251         { TAG_IRC_SERVER,       "iIRC" },
 252         { TAG_STREETTALK_SRVR,  "iSTS" },
 253         { TAG_STREETTALK_STDA,  "iSTDA" },
 254         { TAG_REQUESTED_IP,     "iRQ" },
 255         { TAG_IP_LEASE,         "lLT" },
 256         { TAG_OPT_OVERLOAD,     "bOO" },
 257         { TAG_TFTP_SERVER,      "aTFTP" },
 258         { TAG_BOOTFILENAME,     "aBF" },
 259         { TAG_DHCP_MESSAGE,     " DHCP" },
 260         { TAG_SERVER_ID,        "iSID" },
 261         { TAG_PARM_REQUEST,     "bPR" },
 262         { TAG_MESSAGE,          "aMSG" },
 263         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 264         { TAG_RENEWAL_TIME,     "lRN" },
 265         { TAG_REBIND_TIME,      "lRB" },
 266         { TAG_VENDOR_CLASS,     "bVC" },
 267         { TAG_CLIENT_ID,        "bCID" },
 268         { 0,                    NULL }
 269 };
 270
 271 static void
 272 rfc1048_print(register const u_char *bp, register u_int length)
 273 {
 274         register u_char tag;
 275         register u_int len, size;
 276         register const char *cp;
 277         register char c;
 278         int first;
 279         u_int32_t ul;
 280         u_short us;
 281
 282         printf(" vend-rfc1048");
 283
 284         /* Step over magic cookie */
 285         bp += sizeof(int32_t);
 286
 287         /* Loop while we there is a tag left in the buffer */
 288         while (bp + 1 < snapend) {
 289                 tag = *bp++;
 290                 if (tag == TAG_PAD)
 291                         continue;
 292                 if (tag == TAG_END)
 293                         return;
 294                 cp = tok2str(tag2str, "?T%d", tag);
 295                 c = *cp++;
 296                 printf(" %s:", cp);
 297
 298                 /* Get the length; check for truncation */
 299                 if (bp + 1 >= snapend) {
 300                         fputs(tstr, stdout);
 301                         return;
 302                 }
 303                 len = *bp++;
 304                 if (bp + len >= snapend) {
 305                         fputs(tstr, stdout);
 306                         return;
 307                 }
 308
 309                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 310                         c = *bp++;
 311                         switch (c) {
 312                         case DHCPDISCOVER:      printf("DISCOVER");     break;
 313                         case DHCPOFFER:         printf("OFFER");        break;
 314                         case DHCPREQUEST:       printf("REQUEST");      break;
 315                         case DHCPDECLINE:       printf("DECLINE");      break;
 316                         case DHCPACK:           printf("ACK");          break;
 317                         case DHCPNAK:           printf("NACK");         break;
 318                         case DHCPRELEASE:       printf("RELEASE");      break;
 319                         case DHCPINFORM:        printf("INFORM");       break;
 320                         default:                printf("%u", c);        break;
 321                         }
 322                         continue;
 323                 }
 324
 325                 if (tag == TAG_PARM_REQUEST) {
 326                         first = 1;
 327                         while (len-- > 0) {
 328                                 c = *bp++;
 329                                 cp = tok2str(tag2str, "?%d", c);
 330                                 if (!first)
 331                                         putchar('+');
 332                                 printf("%s", cp + 1);
 333                                 first = 0;
 334                         }
 335                         continue;
 336                 }
 337
 338                 /* Print data */
 339                 size = len;
 340                 if (c == '?') {
 341                         /* Base default formats for unknown tags on data size */
 342                         if (size & 1)
 343                                 c = 'b';
 344                         else if (size & 2)
 345                                 c = 's';
 346                         else
 347                                 c = 'l';
 348                 }
 349                 first = 1;
 350                 switch (c) {
 351
 352                 case 'a':
 353                         /* ascii strings */
 354                         putchar('"');
 355                         (void)fn_printn(bp, size, NULL);
 356                         putchar('"');
 357                         bp += size;
 358                         size = 0;
 359                         break;
 360
 361                 case 'i':
 362                 case 'l':
 363                         /* ip addresses/32-bit words */
 364                         while (size >= sizeof(ul)) {
 365                                 if (!first)
 366                                         putchar(',');
 367                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 368                                 if (c == 'i')
 369                                         printf("%s", ipaddr_string(&ul));
 370                                 else
 371                                         printf("%u", ul);
 372                                 bp += sizeof(ul);
 373                                 size -= sizeof(ul);
 374                                 first = 0;
 375                         }
 376                         break;
 377
 378                 case 'p':
 379                         /* IP address pairs */
 380                         while (size >= 2*sizeof(ul)) {
 381                                 if (!first)
 382                                         putchar(',');
 383                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 384                                 printf("(%s:", ipaddr_string(&ul));
 385                                 bp += sizeof(ul);
 386                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 387                                 printf("%s)", ipaddr_string(&ul));
 388                                 bp += sizeof(ul);
 389                                 size -= 2*sizeof(ul);
 390                                 first = 0;
 391                         }
 392                         break;
 393
 394                 case 's':
 395                         /* shorts */
 396                         while (size >= sizeof(us)) {
 397                                 if (!first)
 398                                         putchar(',');
 399                                 memcpy((char *)&us, (char *)bp, sizeof(us));
 400                                 printf("%d", us);
 401                                 bp += sizeof(us);
 402                                 size -= sizeof(us);
 403                                 first = 0;
 404                         }
 405                         break;
 406
 407                 case 'B':
 408                         /* boolean */
 409                         while (size > 0) {
 410                                 if (!first)
 411                                         putchar(',');
 412                                 switch (*bp) {
 413                                 case 0:
 414                                         putchar('N');
 415                                         break;
 416                                 case 1:
 417                                         putchar('Y');
 418                                         break;
 419                                 default:
 420                                         printf("%d?", *bp);
 421                                         break;
 422                                 }
 423                                 ++bp;
 424                                 --size;
 425                                 first = 0;
 426                         }
 427                         break;
 428
 429                 case 'b':
 430                 default:
 431                         /* Bytes */
 432                         while (size > 0) {
 433                                 if (!first)
 434                                         putchar('.');
 435                                 printf("%d", *bp);
 436                                 ++bp;
 437                                 --size;
 438                                 first = 0;
 439                         }
 440                         break;
 441                 }
 442                 /* Data left over? */
 443                 if (size)
 444                         printf("[len %d]", len);
 445         }
 446 }
 447
 448 static void
 449 cmu_print(register const u_char *bp, register u_int length)
 450 {
 451         register const struct cmu_vend *cmu;
 452         char *fmt = " %s:%s";
 453
 454 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 455     if (cmu->m.s_addr != 0) \
 456         printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); }
 457
 458         printf(" vend-cmu");
 459         cmu = (struct cmu_vend *)bp;
 460
 461         /* Only print if there are unknown bits */
 462         TCHECK(cmu->v_flags);
 463         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 464                 printf(" F:0x%x", cmu->v_flags);
 465         PRINTCMUADDR(v_dgate, "DG");
 466         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 467         PRINTCMUADDR(v_dns1, "NS1");
 468         PRINTCMUADDR(v_dns2, "NS2");
 469         PRINTCMUADDR(v_ins1, "IEN1");
 470         PRINTCMUADDR(v_ins2, "IEN2");
 471         PRINTCMUADDR(v_ts1, "TS1");
 472         PRINTCMUADDR(v_ts2, "TS2");
 473         return;
 474
 475 trunc:
 476         fputs(tstr, stdout);
 477 #undef PRINTCMUADDR
 478 }