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