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 1.48 1999-11-21 09:36:49 fenner 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 #if __STDC__
  37 struct mbuf;
  38 struct rtentry;
  39 #endif
  40 #include <net/if.h>
  41
  42 #include <netinet/in.h>
  43 #include <netinet/if_ether.h>
  44
  45 #include <ctype.h>
  46 #ifdef HAVE_MEMORY_H
  47 #include <memory.h>
  48 #endif
  49 #include <stdio.h>
  50 #include <string.h>
  51
  52 #include "interface.h"
  53 #include "addrtoname.h"
  54 #include "bootp.h"
  55
  56 static void rfc1048_print(const u_char *, u_int);
  57 static void cmu_print(const u_char *, u_int);
  58
  59 static char tstr[] = " [|bootp]";
  60
  61 /*
  62  * Print bootp requests
  63  */
  64 void
  65 bootp_print(register const u_char *cp, u_int length,
  66             u_short sport, u_short dport)
  67 {
  68         register const struct bootp *bp;
  69         static u_char vm_cmu[4] = VM_CMU;
  70         static u_char vm_rfc1048[4] = VM_RFC1048;
  71
  72         bp = (struct bootp *)cp;
  73         TCHECK(bp->bp_op);
  74         switch (bp->bp_op) {
  75
  76         case BOOTREQUEST:
  77                 /* Usually, a request goes from a client to a server */
  78                 if (sport != IPPORT_BOOTPC || dport != IPPORT_BOOTPS)
  79                         printf(" (request)");
  80                 break;
  81
  82         case BOOTREPLY:
  83                 /* Usually, a reply goes from a server to a client */
  84                 if (sport != IPPORT_BOOTPS || dport != IPPORT_BOOTPC)
  85                         printf(" (reply)");
  86                 break;
  87
  88         default:
  89                 printf(" bootp-#%d", bp->bp_op);
  90         }
  91
  92         TCHECK(bp->bp_secs);
  93
  94         /* The usual hardware address type is 1 (10Mb Ethernet) */
  95         if (bp->bp_htype != 1)
  96                 printf(" htype-#%d", bp->bp_htype);
  97
  98         /* The usual length for 10Mb Ethernet address is 6 bytes */
  99         if (bp->bp_htype != 1 || bp->bp_hlen != 6)
 100                 printf(" hlen:%d", bp->bp_hlen);
 101
 102         /* Only print interesting fields */
 103         if (bp->bp_hops)
 104                 printf(" hops:%d", bp->bp_hops);
 105         if (bp->bp_xid)
 106                 printf(" xid:0x%x", (u_int32_t)ntohl(bp->bp_xid));
 107         if (bp->bp_secs)
 108                 printf(" secs:%d", ntohs(bp->bp_secs));
 109         if (bp->bp_flags)
 110                 printf(" flags:0x%x", ntohs(bp->bp_flags));
 111
 112         /* Client's ip address */
 113         TCHECK(bp->bp_ciaddr);
 114         if (bp->bp_ciaddr.s_addr)
 115                 printf(" C:%s", ipaddr_string(&bp->bp_ciaddr));
 116
 117         /* 'your' ip address (bootp client) */
 118         TCHECK(bp->bp_yiaddr);
 119         if (bp->bp_yiaddr.s_addr)
 120                 printf(" Y:%s", ipaddr_string(&bp->bp_yiaddr));
 121
 122         /* Server's ip address */
 123         TCHECK(bp->bp_siaddr);
 124         if (bp->bp_siaddr.s_addr)
 125                 printf(" S:%s", ipaddr_string(&bp->bp_siaddr));
 126
 127         /* Gateway's ip address */
 128         TCHECK(bp->bp_giaddr);
 129         if (bp->bp_giaddr.s_addr)
 130                 printf(" G:%s", ipaddr_string(&bp->bp_giaddr));
 131
 132         /* Client's Ethernet address */
 133         if (bp->bp_htype == 1 && bp->bp_hlen == 6) {
 134                 register const struct ether_header *eh;
 135                 register const char *e;
 136
 137                 TCHECK2(bp->bp_chaddr[0], 6);
 138                 eh = (struct ether_header *)packetp;
 139                 if (bp->bp_op == BOOTREQUEST)
 140                         e = (const char *)ESRC(eh);
 141                 else if (bp->bp_op == BOOTREPLY)
 142                         e = (const char *)EDST(eh);
 143                 else
 144                         e = 0;
 145                 if (e == 0 || memcmp((char *)bp->bp_chaddr, e, 6) != 0)
 146                         printf(" ether %s", etheraddr_string(bp->bp_chaddr));
 147         }
 148
 149         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 150         if (*bp->bp_sname) {
 151                 printf(" sname \"");
 152                 if (fn_print(bp->bp_sname, snapend)) {
 153                         putchar('"');
 154                         fputs(tstr + 1, stdout);
 155                         return;
 156                 }
 157                 putchar('"');
 158         }
 159         TCHECK2(bp->bp_sname[0], 1);            /* check first char only */
 160         if (*bp->bp_file) {
 161                 printf(" file \"");
 162                 if (fn_print(bp->bp_file, snapend)) {
 163                         putchar('"');
 164                         fputs(tstr + 1, stdout);
 165                         return;
 166                 }
 167                 putchar('"');
 168         }
 169
 170         /* Decode the vendor buffer */
 171         TCHECK(bp->bp_vend[0]);
 172         length -= sizeof(*bp) - sizeof(bp->bp_vend);
 173         if (memcmp((char *)bp->bp_vend, (char *)vm_rfc1048,
 174                  sizeof(u_int32_t)) == 0)
 175                 rfc1048_print(bp->bp_vend, length);
 176         else if (memcmp((char *)bp->bp_vend, (char *)vm_cmu,
 177                       sizeof(u_int32_t)) == 0)
 178                 cmu_print(bp->bp_vend, length);
 179         else {
 180                 u_int32_t ul;
 181
 182                 memcpy((char *)&ul, (char *)bp->bp_vend, sizeof(ul));
 183                 if (ul != 0)
 184                         printf("vend-#0x%x", ul);
 185         }
 186
 187         return;
 188 trunc:
 189         fputs(tstr, stdout);
 190 }
 191
 192 /* The first character specifies the format to print */
 193 static struct tok tag2str[] = {
 194 /* RFC1048 tags */
 195         { TAG_PAD,              " PAD" },
 196         { TAG_SUBNET_MASK,      "iSM" },        /* subnet mask (RFC950) */
 197         { TAG_TIME_OFFSET,      "lTZ" },        /* seconds from UTC */
 198         { TAG_GATEWAY,          "iDG" },        /* default gateway */
 199         { TAG_TIME_SERVER,      "iTS" },        /* time servers (RFC868) */
 200         { TAG_NAME_SERVER,      "iIEN" },       /* IEN name servers (IEN116) */
 201         { TAG_DOMAIN_SERVER,    "iNS" },        /* domain name (RFC1035) */
 202         { TAG_LOG_SERVER,       "iLOG" },       /* MIT log servers */
 203         { TAG_COOKIE_SERVER,    "iCS" },        /* cookie servers (RFC865) */
 204         { TAG_LPR_SERVER,       "iLPR" },       /* lpr server (RFC1179) */
 205         { TAG_IMPRESS_SERVER,   "iIM" },        /* impress servers (Imagen) */
 206         { TAG_RLP_SERVER,       "iRL" },        /* resource location (RFC887) */
 207         { TAG_HOSTNAME,         "aHN" },        /* ascii hostname */
 208         { TAG_BOOTSIZE,         "sBS" },        /* 512 byte blocks */
 209         { TAG_END,              " END" },
 210 /* RFC1497 tags */
 211         { TAG_DUMPPATH,         "aDP" },
 212         { TAG_DOMAINNAME,       "aDN" },
 213         { TAG_SWAP_SERVER,      "iSS" },
 214         { TAG_ROOTPATH,         "aRP" },
 215         { TAG_EXTPATH,          "aEP" },
 216 /* RFC2132 tags */
 217         { TAG_IP_FORWARD,       "BIPF" },
 218         { TAG_NL_SRCRT,         "BSRT" },
 219         { TAG_PFILTERS,         "pPF" },
 220         { TAG_REASS_SIZE,       "sRSZ" },
 221         { TAG_DEF_TTL,          "bTTL" },
 222         { TAG_MTU_TIMEOUT,      "lMA" },
 223         { TAG_MTU_TABLE,        "sMT" },
 224         { TAG_INT_MTU,          "sMTU" },
 225         { TAG_LOCAL_SUBNETS,    "BLSN" },
 226         { TAG_BROAD_ADDR,       "iBR" },
 227         { TAG_DO_MASK_DISC,     "BMD" },
 228         { TAG_SUPPLY_MASK,      "BMS" },
 229         { TAG_DO_RDISC,         "BRD" },
 230         { TAG_RTR_SOL_ADDR,     "iRSA" },
 231         { TAG_STATIC_ROUTE,     "pSR" },
 232         { TAG_USE_TRAILERS,     "BUT" },
 233         { TAG_ARP_TIMEOUT,      "lAT" },
 234         { TAG_ETH_ENCAP,        "BIE" },
 235         { TAG_TCP_TTL,          "bTT" },
 236         { TAG_TCP_KEEPALIVE,    "lKI" },
 237         { TAG_KEEPALIVE_GO,     "BKG" },
 238         { TAG_NIS_DOMAIN,       "aYD" },
 239         { TAG_NIS_SERVERS,      "iYS" },
 240         { TAG_NTP_SERVERS,      "iNTP" },
 241         { TAG_VENDOR_OPTS,      "bVO" },
 242         { TAG_NETBIOS_NS,       "iWNS" },
 243         { TAG_NETBIOS_DDS,      "iWDD" },
 244         { TAG_NETBIOS_NODE,     "bWNT" },
 245         { TAG_NETBIOS_SCOPE,    "aWSC" },
 246         { TAG_XWIN_FS,          "iXFS" },
 247         { TAG_XWIN_DM,          "iXDM" },
 248         { TAG_NIS_P_DOMAIN,     "sN+D" },
 249         { TAG_NIS_P_SERVERS,    "iN+S" },
 250         { TAG_MOBILE_HOME,      "iMH" },
 251         { TAG_SMPT_SERVER,      "iSMTP" },
 252         { TAG_POP3_SERVER,      "iPOP3" },
 253         { TAG_NNTP_SERVER,      "iNNTP" },
 254         { TAG_WWW_SERVER,       "iWWW" },
 255         { TAG_FINGER_SERVER,    "iFG" },
 256         { TAG_IRC_SERVER,       "iIRC" },
 257         { TAG_STREETTALK_SRVR,  "iSTS" },
 258         { TAG_STREETTALK_STDA,  "iSTDA" },
 259         { TAG_REQUESTED_IP,     "iRQ" },
 260         { TAG_IP_LEASE,         "lLT" },
 261         { TAG_OPT_OVERLOAD,     "bOO" },
 262         { TAG_TFTP_SERVER,      "aTFTP" },
 263         { TAG_BOOTFILENAME,     "aBF" },
 264         { TAG_DHCP_MESSAGE,     " DHCP" },
 265         { TAG_SERVER_ID,        "iSID" },
 266         { TAG_PARM_REQUEST,     "bPR" },
 267         { TAG_MESSAGE,          "aMSG" },
 268         { TAG_MAX_MSG_SIZE,     "sMSZ" },
 269         { TAG_RENEWAL_TIME,     "lRN" },
 270         { TAG_REBIND_TIME,      "lRB" },
 271         { TAG_VENDOR_CLASS,     "bVC" },
 272         { TAG_CLIENT_ID,        "bCID" },
 273         { 0,                    NULL }
 274 };
 275
 276 static void
 277 rfc1048_print(register const u_char *bp, register u_int length)
 278 {
 279         register u_char tag;
 280         register u_int len, size;
 281         register const char *cp;
 282         register char c;
 283         int first;
 284         u_int32_t ul;
 285         u_short us;
 286
 287         printf(" vend-rfc1048");
 288
 289         /* Step over magic cookie */
 290         bp += sizeof(int32_t);
 291
 292         /* Loop while we there is a tag left in the buffer */
 293         while (bp + 1 < snapend) {
 294                 tag = *bp++;
 295                 if (tag == TAG_PAD)
 296                         continue;
 297                 if (tag == TAG_END)
 298                         return;
 299                 cp = tok2str(tag2str, "?T%d", tag);
 300                 c = *cp++;
 301                 printf(" %s:", cp);
 302
 303                 /* Get the length; check for truncation */
 304                 if (bp + 1 >= snapend) {
 305                         fputs(tstr, stdout);
 306                         return;
 307                 }
 308                 len = *bp++;
 309                 if (bp + len >= snapend) {
 310                         fputs(tstr, stdout);
 311                         return;
 312                 }
 313
 314                 if (tag == TAG_DHCP_MESSAGE && len == 1) {
 315                         c = *bp++;
 316                         switch (c) {
 317                         case DHCPDISCOVER:      printf("DISCOVER");     break;
 318                         case DHCPOFFER:         printf("OFFER");        break;
 319                         case DHCPREQUEST:       printf("REQUEST");      break;
 320                         case DHCPDECLINE:       printf("DECLINE");      break;
 321                         case DHCPACK:           printf("ACK");          break;
 322                         case DHCPNAK:           printf("NACK");         break;
 323                         case DHCPRELEASE:       printf("RELEASE");      break;
 324                         case DHCPINFORM:        printf("INFORM");       break;
 325                         default:                printf("%u", c);        break;
 326                         }
 327                         continue;
 328                 }
 329
 330                 if (tag == TAG_PARM_REQUEST) {
 331                         first = 1;
 332                         while (len-- > 0) {
 333                                 c = *bp++;
 334                                 cp = tok2str(tag2str, "?%d", c);
 335                                 if (!first)
 336                                         putchar('+');
 337                                 printf("%s", cp + 1);
 338                                 first = 0;
 339                         }
 340                         continue;
 341                 }
 342
 343                 /* Print data */
 344                 size = len;
 345                 if (c == '?') {
 346                         /* Base default formats for unknown tags on data size */
 347                         if (size & 1)
 348                                 c = 'b';
 349                         else if (size & 2)
 350                                 c = 's';
 351                         else
 352                                 c = 'l';
 353                 }
 354                 first = 1;
 355                 switch (c) {
 356
 357                 case 'a':
 358                         /* ascii strings */
 359                         putchar('"');
 360                         (void)fn_printn(bp, size, NULL);
 361                         putchar('"');
 362                         bp += size;
 363                         size = 0;
 364                         break;
 365
 366                 case 'i':
 367                 case 'l':
 368                         /* ip addresses/32-bit words */
 369                         while (size >= sizeof(ul)) {
 370                                 if (!first)
 371                                         putchar(',');
 372                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 373                                 if (c == 'i')
 374                                         printf("%s", ipaddr_string(&ul));
 375                                 else
 376                                         printf("%u", ul);
 377                                 bp += sizeof(ul);
 378                                 size -= sizeof(ul);
 379                                 first = 0;
 380                         }
 381                         break;
 382
 383                 case 'p':
 384                         /* IP address pairs */
 385                         while (size >= 2*sizeof(ul)) {
 386                                 if (!first)
 387                                         putchar(',');
 388                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 389                                 printf("(%s:", ipaddr_string(&ul));
 390                                 bp += sizeof(ul);
 391                                 memcpy((char *)&ul, (char *)bp, sizeof(ul));
 392                                 printf("%s)", ipaddr_string(&ul));
 393                                 bp += sizeof(ul);
 394                                 size -= 2*sizeof(ul);
 395                                 first = 0;
 396                         }
 397                         break;
 398
 399                 case 's':
 400                         /* shorts */
 401                         while (size >= sizeof(us)) {
 402                                 if (!first)
 403                                         putchar(',');
 404                                 memcpy((char *)&us, (char *)bp, sizeof(us));
 405                                 printf("%d", us);
 406                                 bp += sizeof(us);
 407                                 size -= sizeof(us);
 408                                 first = 0;
 409                         }
 410                         break;
 411
 412                 case 'B':
 413                         /* boolean */
 414                         while (size > 0) {
 415                                 if (!first)
 416                                         putchar(',');
 417                                 switch (*bp) {
 418                                 case 0:
 419                                         putchar('N');
 420                                         break;
 421                                 case 1:
 422                                         putchar('Y');
 423                                         break;
 424                                 default:
 425                                         printf("%d?", *bp);
 426                                         break;
 427                                 }
 428                                 ++bp;
 429                                 --size;
 430                                 first = 0;
 431                         }
 432                         break;
 433
 434                 case 'b':
 435                 default:
 436                         /* Bytes */
 437                         while (size > 0) {
 438                                 if (!first)
 439                                         putchar('.');
 440                                 printf("%d", *bp);
 441                                 ++bp;
 442                                 --size;
 443                                 first = 0;
 444                         }
 445                         break;
 446                 }
 447                 /* Data left over? */
 448                 if (size)
 449                         printf("[len %d]", len);
 450         }
 451 }
 452
 453 static void
 454 cmu_print(register const u_char *bp, register u_int length)
 455 {
 456         register const struct cmu_vend *cmu;
 457         char *fmt = " %s:%s";
 458
 459 #define PRINTCMUADDR(m, s) { TCHECK(cmu->m); \
 460     if (cmu->m.s_addr != 0) \
 461         printf(fmt, s, ipaddr_string(&cmu->m.s_addr)); }
 462
 463         printf(" vend-cmu");
 464         cmu = (struct cmu_vend *)bp;
 465
 466         /* Only print if there are unknown bits */
 467         TCHECK(cmu->v_flags);
 468         if ((cmu->v_flags & ~(VF_SMASK)) != 0)
 469                 printf(" F:0x%x", cmu->v_flags);
 470         PRINTCMUADDR(v_dgate, "DG");
 471         PRINTCMUADDR(v_smask, cmu->v_flags & VF_SMASK ? "SM" : "SM*");
 472         PRINTCMUADDR(v_dns1, "NS1");
 473         PRINTCMUADDR(v_dns2, "NS2");
 474         PRINTCMUADDR(v_ins1, "IEN1");
 475         PRINTCMUADDR(v_ins2, "IEN2");
 476         PRINTCMUADDR(v_ts1, "TS1");
 477         PRINTCMUADDR(v_ts2, "TS2");
 478         return;
 479
 480 trunc:
 481         fputs(tstr, stdout);
 482 #undef PRINTCMUADDR
 483 }