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