The Tcpdump Group git mirrors - libpcap/blob - scanner.l

   1 %top {
   2 /* Must come first for _LARGE_FILE_API on AIX. */
   3 #ifdef HAVE_CONFIG_H
   4 #include <config.h>
   5 #endif
   6
   7 /*
   8  * Must come first to avoid warnings on Windows.
   9  *
  10  * Flex-generated scanners may only include <inttypes.h> if __STDC_VERSION__
  11  * is defined with a value >= 199901, meaning "full C99", and MSVC may not
  12  * define it with that value, because it isn't 100% C99-compliant, even
  13  * though it has an <inttypes.h> capable of defining everything the Flex
  14  * scanner needs.
  15  *
  16  * We, however, will include it if we know we have an MSVC version that has
  17  * it; this means that we may define the INTn_MAX and UINTn_MAX values in
  18  * scanner.c, and then include <stdint.h>, which may define them differently
  19  * (same value, but different string of characters), causing compiler warnings.
  20  *
  21  * If we include it here, and they're defined, that'll prevent scanner.c
  22  * from defining them.  So we include <pcap/pcap-inttypes.h>, to get
  23  * <inttypes.h> if we have it.
  24  */
  25 #include <pcap/pcap-inttypes.h>
  26
  27 #include "diag-control.h"
  28 }
  29
  30 /*
  31  * We want a reentrant scanner.
  32  */
  33 %option reentrant
  34
  35 /*
  36  * And we need to pass the compiler state to the scanner.
  37  */
  38 %option extra-type="compiler_state_t *"
  39
  40 /*
  41  * We don't use input, so don't generate code for it.
  42  */
  43 %option noinput
  44
  45 /*
  46  * We don't use unput, so don't generate code for it.
  47  */
  48 %option nounput
  49
  50 /*
  51  * We don't read from the terminal.
  52  */
  53 %option never-interactive
  54
  55 /*
  56  * We want to stop processing when we get to the end of the input.
  57  */
  58 %option noyywrap
  59
  60 /*
  61  * We want to generate code that can be used by a reentrant parser
  62  * generated by Bison or Berkeley YACC.
  63  */
  64 %option bison-bridge
  65
  66 %{
  67 /*
  68  * Copyright (c) 1988, 1989, 1990, 1991, 1992, 1993, 1994, 1995, 1996, 1997
  69  *      The Regents of the University of California.  All rights reserved.
  70  *
  71  * Redistribution and use in source and binary forms, with or without
  72  * modification, are permitted provided that: (1) source code distributions
  73  * retain the above copyright notice and this paragraph in its entirety, (2)
  74  * distributions including binary code include the above copyright notice and
  75  * this paragraph in its entirety in the documentation or other materials
  76  * provided with the distribution, and (3) all advertising materials mentioning
  77  * features or use of this software display the following acknowledgement:
  78  * ``This product includes software developed by the University of California,
  79  * Lawrence Berkeley Laboratory and its contributors.'' Neither the name of
  80  * the University nor the names of its contributors may be used to endorse
  81  * or promote products derived from this software without specific prior
  82  * written permission.
  83  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
  84  * WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
  85  * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
  86  */
  87
  88 #include <ctype.h>
  89 #include <string.h>
  90
  91 #include "pcap-int.h"
  92
  93 #include "gencode.h"
  94
  95 #include "grammar.h"
  96
  97 /*
  98  * Earlier versions of Flex don't declare these, so we declare them
  99  * ourselves to squelch warnings.
 100  */
 101 int pcap_get_column(yyscan_t);
 102 void pcap_set_column(int, yyscan_t);
 103
 104 #ifdef INET6
 105
 106 #ifdef _WIN32
 107 #include <winsock2.h>
 108 #include <ws2tcpip.h>
 109 /*
 110  * To quote the MSDN page for getaddrinfo() at
 111  *
 112  *    https://msdn.microsoft.com/en-us/library/windows/desktop/ms738520(v=vs.85).aspx
 113  *
 114  * "Support for getaddrinfo on Windows 2000 and older versions
 115  * The getaddrinfo function was added to the Ws2_32.dll on Windows XP and
 116  * later. To execute an application that uses this function on earlier
 117  * versions of Windows, then you need to include the Ws2tcpip.h and
 118  * Wspiapi.h files. When the Wspiapi.h include file is added, the
 119  * getaddrinfo function is defined to the WspiapiGetAddrInfo inline
 120  * function in the Wspiapi.h file. At runtime, the WspiapiGetAddrInfo
 121  * function is implemented in such a way that if the Ws2_32.dll or the
 122  * Wship6.dll (the file containing getaddrinfo in the IPv6 Technology
 123  * Preview for Windows 2000) does not include getaddrinfo, then a
 124  * version of getaddrinfo is implemented inline based on code in the
 125  * Wspiapi.h header file. This inline code will be used on older Windows
 126  * platforms that do not natively support the getaddrinfo function."
 127  *
 128  * We use getaddrinfo(), so we include Wspiapi.h here.
 129  */
 130 #include <wspiapi.h>
 131 #else /* _WIN32 */
 132 #include <sys/socket.h> /* for "struct sockaddr" in "struct addrinfo" */
 133 #include <netdb.h>      /* for "struct addrinfo" */
 134 #endif /* _WIN32 */
 135
 136 /* Workaround for AIX 4.3 */
 137 #if !defined(AI_NUMERICHOST)
 138 #define AI_NUMERICHOST 0x04
 139 #endif
 140
 141 #endif /*INET6*/
 142
 143 #include <pcap/namedb.h>
 144 #include "grammar.h"
 145
 146 #ifdef HAVE_OS_PROTO_H
 147 #include "os-proto.h"
 148 #endif
 149
 150 static int stoi(char *);
 151 static inline int xdtoi(int);
 152
 153 /*
 154  * Disable diagnostics in the code generated by Flex.
 155  */
 156 DIAG_OFF_FLEX
 157
 158 %}
 159
 160 N               ([0-9]+|(0X|0x)[0-9A-Fa-f]+)
 161 B               ([0-9A-Fa-f][0-9A-Fa-f]?)
 162 B2              ([0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f])
 163 W               ([0-9A-Fa-f][0-9A-Fa-f]?[0-9A-Fa-f]?[0-9A-Fa-f]?)
 164
 165 %a 18400
 166 %o 21500
 167 %e 7600
 168 %k 4550
 169 %p 27600
 170 %n 2000
 171
 172 V680            {W}:{W}:{W}:{W}:{W}:{W}:{W}:{W}
 173
 174 V670            ::{W}:{W}:{W}:{W}:{W}:{W}:{W}
 175 V671            {W}::{W}:{W}:{W}:{W}:{W}:{W}
 176 V672            {W}:{W}::{W}:{W}:{W}:{W}:{W}
 177 V673            {W}:{W}:{W}::{W}:{W}:{W}:{W}
 178 V674            {W}:{W}:{W}:{W}::{W}:{W}:{W}
 179 V675            {W}:{W}:{W}:{W}:{W}::{W}:{W}
 180 V676            {W}:{W}:{W}:{W}:{W}:{W}::{W}
 181 V677            {W}:{W}:{W}:{W}:{W}:{W}:{W}::
 182
 183 V660            ::{W}:{W}:{W}:{W}:{W}:{W}
 184 V661            {W}::{W}:{W}:{W}:{W}:{W}
 185 V662            {W}:{W}::{W}:{W}:{W}:{W}
 186 V663            {W}:{W}:{W}::{W}:{W}:{W}
 187 V664            {W}:{W}:{W}:{W}::{W}:{W}
 188 V665            {W}:{W}:{W}:{W}:{W}::{W}
 189 V666            {W}:{W}:{W}:{W}:{W}:{W}::
 190
 191 V650            ::{W}:{W}:{W}:{W}:{W}
 192 V651            {W}::{W}:{W}:{W}:{W}
 193 V652            {W}:{W}::{W}:{W}:{W}
 194 V653            {W}:{W}:{W}::{W}:{W}
 195 V654            {W}:{W}:{W}:{W}::{W}
 196 V655            {W}:{W}:{W}:{W}:{W}::
 197
 198 V640            ::{W}:{W}:{W}:{W}
 199 V641            {W}::{W}:{W}:{W}
 200 V642            {W}:{W}::{W}:{W}
 201 V643            {W}:{W}:{W}::{W}
 202 V644            {W}:{W}:{W}:{W}::
 203
 204 V630            ::{W}:{W}:{W}
 205 V631            {W}::{W}:{W}
 206 V632            {W}:{W}::{W}
 207 V633            {W}:{W}:{W}::
 208
 209 V620            ::{W}:{W}
 210 V621            {W}::{W}
 211 V622            {W}:{W}::
 212
 213 V610            ::{W}
 214 V611            {W}::
 215
 216 V600            ::
 217
 218 V6604           {W}:{W}:{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 219
 220 V6504           ::{W}:{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 221 V6514           {W}::{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 222 V6524           {W}:{W}::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 223 V6534           {W}:{W}:{W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 224 V6544           {W}:{W}:{W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 225 V6554           {W}:{W}:{W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 226
 227 V6404           ::{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 228 V6414           {W}::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 229 V6424           {W}:{W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 230 V6434           {W}:{W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 231 V6444           {W}:{W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 232
 233 V6304           ::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 234 V6314           {W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 235 V6324           {W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 236 V6334           {W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 237
 238 V6204           ::{W}:{W}:{N}\.{N}\.{N}\.{N}
 239 V6214           {W}::{W}:{N}\.{N}\.{N}\.{N}
 240 V6224           {W}:{W}::{N}\.{N}\.{N}\.{N}
 241
 242 V6104           ::{W}:{N}\.{N}\.{N}\.{N}
 243 V6114           {W}::{N}\.{N}\.{N}\.{N}
 244
 245 V6004           ::{N}\.{N}\.{N}\.{N}
 246
 247
 248 V6              ({V680}|{V670}|{V671}|{V672}|{V673}|{V674}|{V675}|{V676}|{V677}|{V660}|{V661}|{V662}|{V663}|{V664}|{V665}|{V666}|{V650}|{V651}|{V652}|{V653}|{V654}|{V655}|{V640}|{V641}|{V642}|{V643}|{V644}|{V630}|{V631}|{V632}|{V633}|{V620}|{V621}|{V622}|{V610}|{V611}|{V600}|{V6604}|{V6504}|{V6514}|{V6524}|{V6534}|{V6544}|{V6554}|{V6404}|{V6414}|{V6424}|{V6434}|{V6444}|{V6304}|{V6314}|{V6324}|{V6334}|{V6204}|{V6214}|{V6224}|{V6104}|{V6114}|{V6004})
 249
 250 MAC             ({B}:{B}:{B}:{B}:{B}:{B}|{B}\-{B}\-{B}\-{B}\-{B}\-{B}|{B}\.{B}\.{B}\.{B}\.{B}\.{B}|{B2}\.{B2}\.{B2}|{B2}{3})
 251
 252
 253
 254 %%
 255 dst             return DST;
 256 src             return SRC;
 257
 258 link|ether|ppp|slip  return LINK;
 259 fddi|tr|wlan    return LINK;
 260 arp             return ARP;
 261 rarp            return RARP;
 262 ip              return IP;
 263 sctp            return SCTP;
 264 tcp             return TCP;
 265 udp             return UDP;
 266 icmp            return ICMP;
 267 igmp            return IGMP;
 268 igrp            return IGRP;
 269 pim             return PIM;
 270 vrrp            return VRRP;
 271 carp            return CARP;
 272 radio           return RADIO;
 273
 274 ip6             return IPV6;
 275 icmp6           return ICMPV6;
 276 ah              return AH;
 277 esp             return ESP;
 278
 279 atalk           return ATALK;
 280 aarp            return AARP;
 281 decnet          return DECNET;
 282 lat             return LAT;
 283 sca             return SCA;
 284 moprc           return MOPRC;
 285 mopdl           return MOPDL;
 286
 287 iso             return ISO;
 288 esis            return ESIS;
 289 es-is           return ESIS;
 290 isis            return ISIS;
 291 is-is           return ISIS;
 292 l1              return L1;
 293 l2              return L2;
 294 iih             return IIH;
 295 lsp             return LSP;
 296 snp             return SNP;
 297 csnp            return CSNP;
 298 psnp            return PSNP;
 299
 300 clnp            return CLNP;
 301
 302 stp             return STP;
 303
 304 ipx             return IPX;
 305
 306 netbeui         return NETBEUI;
 307
 308 host            return HOST;
 309 net             return NET;
 310 mask            return NETMASK;
 311 port            return PORT;
 312 portrange       return PORTRANGE;
 313 proto           return PROTO;
 314 protochain      {
 315 #ifdef NO_PROTOCHAIN
 316                   bpf_error(yyextra, "%s not supported", yytext);
 317 #else
 318                   return PROTOCHAIN;
 319 #endif
 320                 }
 321
 322 gateway         return GATEWAY;
 323
 324 type            return TYPE;
 325 subtype         return SUBTYPE;
 326 direction|dir   return DIR;
 327 address1|addr1  return ADDR1;
 328 address2|addr2  return ADDR2;
 329 address3|addr3  return ADDR3;
 330 address4|addr4  return ADDR4;
 331 ra              return RA;
 332 ta              return TA;
 333
 334 less            return LESS;
 335 greater         return GREATER;
 336 byte            return CBYTE;
 337 broadcast       return TK_BROADCAST;
 338 multicast       return TK_MULTICAST;
 339
 340 and|"&&"        return AND;
 341 or|"||"         return OR;
 342 not             return '!';
 343
 344 len|length      return LEN;
 345 inbound         return INBOUND;
 346 outbound        return OUTBOUND;
 347
 348 vlan            return VLAN;
 349 mpls            return MPLS;
 350 pppoed          return PPPOED;
 351 pppoes          return PPPOES;
 352 geneve          return GENEVE;
 353
 354 lane            return LANE;
 355 llc             return LLC;
 356 metac           return METAC;
 357 bcc             return BCC;
 358 oam             return OAM;
 359 oamf4           return OAMF4;
 360 oamf4ec         return OAMF4EC;
 361 oamf4sc         return OAMF4SC;
 362 sc              return SC;
 363 ilmic           return ILMIC;
 364 vpi             return VPI;
 365 vci             return VCI;
 366 connectmsg      return CONNECTMSG;
 367 metaconnect     return METACONNECT;
 368
 369 on|ifname       return PF_IFNAME;
 370 rset|ruleset    return PF_RSET;
 371 rnr|rulenum     return PF_RNR;
 372 srnr|subrulenum return PF_SRNR;
 373 reason          return PF_REASON;
 374 action          return PF_ACTION;
 375
 376 fisu            return FISU;
 377 lssu            return LSSU;
 378 lsu             return LSSU;
 379 msu             return MSU;
 380 hfisu           return HFISU;
 381 hlssu           return HLSSU;
 382 hmsu            return HMSU;
 383 sio             return SIO;
 384 opc             return OPC;
 385 dpc             return DPC;
 386 sls             return SLS;
 387 hsio            return HSIO;
 388 hopc            return HOPC;
 389 hdpc            return HDPC;
 390 hsls            return HSLS;
 391
 392 [ \r\n\t]               ;
 393 [+\-*/%:\[\]!<>()&|\^=] return yytext[0];
 394 ">="                    return GEQ;
 395 "<="                    return LEQ;
 396 "!="                    return NEQ;
 397 "=="                    return '=';
 398 "<<"                    return LSH;
 399 ">>"                    return RSH;
 400 ${B}                    { yylval->s = sdup(yyextra, yytext); return AID; }
 401 {MAC}                   { yylval->s = sdup(yyextra, yytext); return EID; }
 402 {N}                     { yylval->i = stoi((char *)yytext); return NUM; }
 403 ({N}\.{N})|({N}\.{N}\.{N})|({N}\.{N}\.{N}\.{N}) {
 404                         yylval->s = sdup(yyextra, (char *)yytext); return HID; }
 405 {V6}                    {
 406 #ifdef INET6
 407                           struct addrinfo hints, *res;
 408                           memset(&hints, 0, sizeof(hints));
 409                           hints.ai_family = AF_INET6;
 410                           hints.ai_flags = AI_NUMERICHOST;
 411                           if (getaddrinfo(yytext, NULL, &hints, &res))
 412                                 bpf_error(yyextra, "bogus IPv6 address %s", yytext);
 413                           else {
 414                                 freeaddrinfo(res);
 415                                 yylval->s = sdup(yyextra, (char *)yytext); return HID6;
 416                           }
 417 #else
 418                           bpf_error(yyextra, "IPv6 address %s not supported", yytext);
 419 #endif /*INET6*/
 420                         }
 421 {B}:+({B}:+)+           { bpf_error(yyextra, "bogus ethernet address %s", yytext); }
 422 icmptype                { yylval->i = 0; return NUM; }
 423 icmpcode                { yylval->i = 1; return NUM; }
 424 icmp-echoreply          { yylval->i = 0; return NUM; }
 425 icmp-unreach            { yylval->i = 3; return NUM; }
 426 icmp-sourcequench       { yylval->i = 4; return NUM; }
 427 icmp-redirect           { yylval->i = 5; return NUM; }
 428 icmp-echo               { yylval->i = 8; return NUM; }
 429 icmp-routeradvert       { yylval->i = 9; return NUM; }
 430 icmp-routersolicit      { yylval->i = 10; return NUM; }
 431 icmp-timxceed           { yylval->i = 11; return NUM; }
 432 icmp-paramprob          { yylval->i = 12; return NUM; }
 433 icmp-tstamp             { yylval->i = 13; return NUM; }
 434 icmp-tstampreply        { yylval->i = 14; return NUM; }
 435 icmp-ireq               { yylval->i = 15; return NUM; }
 436 icmp-ireqreply          { yylval->i = 16; return NUM; }
 437 icmp-maskreq            { yylval->i = 17; return NUM; }
 438 icmp-maskreply          { yylval->i = 18; return NUM; }
 439
 440 icmp6type       { yylval->i = 0; return NUM; }
 441 icmp6code       { yylval->i = 1; return NUM; }
 442
 443 icmp6-echo      { yylval->i = 128; return NUM; }
 444 icmp6-echoreply { yylval->i = 129; return NUM; }
 445 icmp6-multicastlistenerquery    { yylval->i = 130; return NUM; }
 446 icmp6-multicastlistenerreportv1 { yylval->i = 131; return NUM; }
 447 icmp6-multicastlistenerdone     { yylval->i = 132; return NUM; }
 448 icmp6-routersolicit   { yylval->i = 133; return NUM; }
 449 icmp6-routeradvert    { yylval->i = 134; return NUM; }
 450 icmp6-neighborsolicit { yylval->i = 135; return NUM; }
 451 icmp6-neighboradvert  { yylval->i = 136; return NUM; }
 452 icmp6-redirect    { yylval->i = 137; return NUM; }
 453 icmp6-routerrenum { yylval->i = 138; return NUM; }
 454 icmp6-nodeinformationquery      { yylval->i = 139; return NUM; }
 455 icmp6-nodeinformationresponse   { yylval->i = 140; return NUM; }
 456 icmp6-ineighbordiscoverysolicit { yylval->i = 141; return NUM; }
 457 icmp6-ineighbordiscoveryadvert  { yylval->i = 142; return NUM; }
 458 icmp6-multicastlistenerreportv2 { yylval->i = 143; return NUM; }
 459 icmp6-homeagentdiscoveryrequest { yylval->i = 144; return NUM; }
 460 icmp6-homeagentdiscoveryreply   { yylval->i = 145; return NUM; }
 461 icmp6-mobileprefixsolicit       { yylval->i = 146; return NUM; }
 462 icmp6-mobileprefixadvert        { yylval->i = 147; return NUM; }
 463 icmp6-certpathsolicit           { yylval->i = 148; return NUM; }
 464 icmp6-certpathadvert            { yylval->i = 149; return NUM; }
 465 icmp6-multicastrouteradvert     { yylval->i = 151; return NUM; }
 466 icmp6-multicastroutersolicit    { yylval->i = 152; return NUM; }
 467 icmp6-multicastrouterterm       { yylval->i = 153; return NUM; }
 468
 469 tcpflags                { yylval->i = 13; return NUM; }
 470 tcp-fin                 { yylval->i = 0x01; return NUM; }
 471 tcp-syn                 { yylval->i = 0x02; return NUM; }
 472 tcp-rst                 { yylval->i = 0x04; return NUM; }
 473 tcp-push                { yylval->i = 0x08; return NUM; }
 474 tcp-ack                 { yylval->i = 0x10; return NUM; }
 475 tcp-urg                 { yylval->i = 0x20; return NUM; }
 476 tcp-ece                 { yylval->i = 0x40; return NUM; }
 477 tcp-cwr                 { yylval->i = 0x80; return NUM; }
 478 [A-Za-z0-9]([-_.A-Za-z0-9]*[.A-Za-z0-9])? {
 479                          yylval->s = sdup(yyextra, (char *)yytext); return ID; }
 480 "\\"[^ !()\n\t]+        { yylval->s = sdup(yyextra, (char *)yytext + 1); return ID; }
 481 [^ \[\]\t\n\-_.A-Za-z0-9!<>()&|=]+ {
 482                         bpf_error(yyextra, "illegal token: %s", yytext); }
 483 .                       { bpf_error(yyextra, "illegal char '%c'", *yytext); }
 484 %%
 485
 486 /*
 487  * Turn diagnostics back on, so we check the code that we've written.
 488  */
 489 DIAG_ON_FLEX
 490
 491 /* Hex digit to integer. */
 492 static inline int
 493 xdtoi(int c)
 494 {
 495         if (isdigit(c))
 496                 return c - '0';
 497         else if (islower(c))
 498                 return c - 'a' + 10;
 499         else
 500                 return c - 'A' + 10;
 501 }
 502
 503 /*
 504  * Convert string to integer.  Just like atoi(), but checks for
 505  * preceding 0x or 0 and uses hex or octal instead of decimal.
 506  */
 507 static int
 508 stoi(char *s)
 509 {
 510         int base = 10;
 511         int n = 0;
 512
 513         if (*s == '0') {
 514                 if (s[1] == 'x' || s[1] == 'X') {
 515                         s += 2;
 516                         base = 16;
 517                 }
 518                 else {
 519                         base = 8;
 520                         s += 1;
 521                 }
 522         }
 523         while (*s)
 524                 n = n * base + xdtoi(*s++);
 525
 526         return n;
 527 }