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 #ifdef _WIN32
  86   #include <pcap-stdinc.h>
  87 #endif
  88
  89 #include <ctype.h>
  90 #include <string.h>
  91
  92 #include "pcap-int.h"
  93
  94 #include "gencode.h"
  95
  96 #include "grammar.h"
  97
  98 /*
  99  * Earlier versions of Flex don't declare these, so we declare them
 100  * ourselves to squelch warnings.
 101  */
 102 int pcap_get_column(yyscan_t);
 103 void pcap_set_column(int, yyscan_t);
 104
 105 #ifdef INET6
 106
 107 #ifdef _WIN32
 108 /*
 109  * To quote the MSDN page for getaddrinfo() at
 110  *
 111  *    https://msdn.microsoft.com/en-us/library/windows/desktop/ms738520(v=vs.85).aspx
 112  *
 113  * "Support for getaddrinfo on Windows 2000 and older versions
 114  * The getaddrinfo function was added to the Ws2_32.dll on Windows XP and
 115  * later. To execute an application that uses this function on earlier
 116  * versions of Windows, then you need to include the Ws2tcpip.h and
 117  * Wspiapi.h files. When the Wspiapi.h include file is added, the
 118  * getaddrinfo function is defined to the WspiapiGetAddrInfo inline
 119  * function in the Wspiapi.h file. At runtime, the WspiapiGetAddrInfo
 120  * function is implemented in such a way that if the Ws2_32.dll or the
 121  * Wship6.dll (the file containing getaddrinfo in the IPv6 Technology
 122  * Preview for Windows 2000) does not include getaddrinfo, then a
 123  * version of getaddrinfo is implemented inline based on code in the
 124  * Wspiapi.h header file. This inline code will be used on older Windows
 125  * platforms that do not natively support the getaddrinfo function."
 126  *
 127  * We use getaddrinfo(), so we include Wspiapi.h here.  pcap-stdinc.h
 128  * includes Ws2tcpip.h, so we don't need to include it ourselves.
 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
 155 N               ([0-9]+|(0X|0x)[0-9A-Fa-f]+)
 156 B               ([0-9A-Fa-f][0-9A-Fa-f]?)
 157 B2              ([0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f][0-9A-Fa-f])
 158 W               ([0-9A-Fa-f][0-9A-Fa-f]?[0-9A-Fa-f]?[0-9A-Fa-f]?)
 159
 160 %a 18400
 161 %o 21500
 162 %e 7600
 163 %k 4550
 164 %p 27600
 165 %n 2000
 166
 167 V680            {W}:{W}:{W}:{W}:{W}:{W}:{W}:{W}
 168
 169 V670            ::{W}:{W}:{W}:{W}:{W}:{W}:{W}
 170 V671            {W}::{W}:{W}:{W}:{W}:{W}:{W}
 171 V672            {W}:{W}::{W}:{W}:{W}:{W}:{W}
 172 V673            {W}:{W}:{W}::{W}:{W}:{W}:{W}
 173 V674            {W}:{W}:{W}:{W}::{W}:{W}:{W}
 174 V675            {W}:{W}:{W}:{W}:{W}::{W}:{W}
 175 V676            {W}:{W}:{W}:{W}:{W}:{W}::{W}
 176 V677            {W}:{W}:{W}:{W}:{W}:{W}:{W}::
 177
 178 V660            ::{W}:{W}:{W}:{W}:{W}:{W}
 179 V661            {W}::{W}:{W}:{W}:{W}:{W}
 180 V662            {W}:{W}::{W}:{W}:{W}:{W}
 181 V663            {W}:{W}:{W}::{W}:{W}:{W}
 182 V664            {W}:{W}:{W}:{W}::{W}:{W}
 183 V665            {W}:{W}:{W}:{W}:{W}::{W}
 184 V666            {W}:{W}:{W}:{W}:{W}:{W}::
 185
 186 V650            ::{W}:{W}:{W}:{W}:{W}
 187 V651            {W}::{W}:{W}:{W}:{W}
 188 V652            {W}:{W}::{W}:{W}:{W}
 189 V653            {W}:{W}:{W}::{W}:{W}
 190 V654            {W}:{W}:{W}:{W}::{W}
 191 V655            {W}:{W}:{W}:{W}:{W}::
 192
 193 V640            ::{W}:{W}:{W}:{W}
 194 V641            {W}::{W}:{W}:{W}
 195 V642            {W}:{W}::{W}:{W}
 196 V643            {W}:{W}:{W}::{W}
 197 V644            {W}:{W}:{W}:{W}::
 198
 199 V630            ::{W}:{W}:{W}
 200 V631            {W}::{W}:{W}
 201 V632            {W}:{W}::{W}
 202 V633            {W}:{W}:{W}::
 203
 204 V620            ::{W}:{W}
 205 V621            {W}::{W}
 206 V622            {W}:{W}::
 207
 208 V610            ::{W}
 209 V611            {W}::
 210
 211 V600            ::
 212
 213 V6604           {W}:{W}:{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 214
 215 V6504           ::{W}:{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 216 V6514           {W}::{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 217 V6524           {W}:{W}::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 218 V6534           {W}:{W}:{W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 219 V6544           {W}:{W}:{W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 220 V6554           {W}:{W}:{W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 221
 222 V6404           ::{W}:{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 223 V6414           {W}::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 224 V6424           {W}:{W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 225 V6434           {W}:{W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 226 V6444           {W}:{W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 227
 228 V6304           ::{W}:{W}:{W}:{N}\.{N}\.{N}\.{N}
 229 V6314           {W}::{W}:{W}:{N}\.{N}\.{N}\.{N}
 230 V6324           {W}:{W}::{W}:{N}\.{N}\.{N}\.{N}
 231 V6334           {W}:{W}:{W}::{N}\.{N}\.{N}\.{N}
 232
 233 V6204           ::{W}:{W}:{N}\.{N}\.{N}\.{N}
 234 V6214           {W}::{W}:{N}\.{N}\.{N}\.{N}
 235 V6224           {W}:{W}::{N}\.{N}\.{N}\.{N}
 236
 237 V6104           ::{W}:{N}\.{N}\.{N}\.{N}
 238 V6114           {W}::{N}\.{N}\.{N}\.{N}
 239
 240 V6004           ::{N}\.{N}\.{N}\.{N}
 241
 242
 243 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})
 244
 245 MAC             ({B}:{B}:{B}:{B}:{B}:{B}|{B}\-{B}\-{B}\-{B}\-{B}\-{B}|{B}\.{B}\.{B}\.{B}\.{B}\.{B}|{B2}\.{B2}\.{B2}|{B2}{3})
 246
 247
 248
 249 %%
 250 dst             return DST;
 251 src             return SRC;
 252
 253 link|ether|ppp|slip  return LINK;
 254 fddi|tr|wlan    return LINK;
 255 arp             return ARP;
 256 rarp            return RARP;
 257 ip              return IP;
 258 sctp            return SCTP;
 259 tcp             return TCP;
 260 udp             return UDP;
 261 icmp            return ICMP;
 262 igmp            return IGMP;
 263 igrp            return IGRP;
 264 pim             return PIM;
 265 vrrp            return VRRP;
 266 carp            return CARP;
 267 radio           return RADIO;
 268
 269 ip6             return IPV6;
 270 icmp6           return ICMPV6;
 271 ah              return AH;
 272 esp             return ESP;
 273
 274 atalk           return ATALK;
 275 aarp            return AARP;
 276 decnet          return DECNET;
 277 lat             return LAT;
 278 sca             return SCA;
 279 moprc           return MOPRC;
 280 mopdl           return MOPDL;
 281
 282 iso             return ISO;
 283 esis            return ESIS;
 284 es-is           return ESIS;
 285 isis            return ISIS;
 286 is-is           return ISIS;
 287 l1              return L1;
 288 l2              return L2;
 289 iih             return IIH;
 290 lsp             return LSP;
 291 snp             return SNP;
 292 csnp            return CSNP;
 293 psnp            return PSNP;
 294
 295 clnp            return CLNP;
 296
 297 stp             return STP;
 298
 299 ipx             return IPX;
 300
 301 netbeui         return NETBEUI;
 302
 303 host            return HOST;
 304 net             return NET;
 305 mask            return NETMASK;
 306 port            return PORT;
 307 portrange       return PORTRANGE;
 308 proto           return PROTO;
 309 protochain      {
 310 #ifdef NO_PROTOCHAIN
 311                   bpf_error(yyextra, "%s not supported", yytext);
 312 #else
 313                   return PROTOCHAIN;
 314 #endif
 315                 }
 316
 317 gateway         return GATEWAY;
 318
 319 type            return TYPE;
 320 subtype         return SUBTYPE;
 321 direction|dir   return DIR;
 322 address1|addr1  return ADDR1;
 323 address2|addr2  return ADDR2;
 324 address3|addr3  return ADDR3;
 325 address4|addr4  return ADDR4;
 326 ra              return RA;
 327 ta              return TA;
 328
 329 less            return LESS;
 330 greater         return GREATER;
 331 byte            return CBYTE;
 332 broadcast       return TK_BROADCAST;
 333 multicast       return TK_MULTICAST;
 334
 335 and|"&&"        return AND;
 336 or|"||"         return OR;
 337 not             return '!';
 338
 339 len|length      return LEN;
 340 inbound         return INBOUND;
 341 outbound        return OUTBOUND;
 342
 343 vlan            return VLAN;
 344 mpls            return MPLS;
 345 pppoed          return PPPOED;
 346 pppoes          return PPPOES;
 347 geneve          return GENEVE;
 348
 349 lane            return LANE;
 350 llc             return LLC;
 351 metac           return METAC;
 352 bcc             return BCC;
 353 oam             return OAM;
 354 oamf4           return OAMF4;
 355 oamf4ec         return OAMF4EC;
 356 oamf4sc         return OAMF4SC;
 357 sc              return SC;
 358 ilmic           return ILMIC;
 359 vpi             return VPI;
 360 vci             return VCI;
 361 connectmsg      return CONNECTMSG;
 362 metaconnect     return METACONNECT;
 363
 364 on|ifname       return PF_IFNAME;
 365 rset|ruleset    return PF_RSET;
 366 rnr|rulenum     return PF_RNR;
 367 srnr|subrulenum return PF_SRNR;
 368 reason          return PF_REASON;
 369 action          return PF_ACTION;
 370
 371 fisu            return FISU;
 372 lssu            return LSSU;
 373 lsu             return LSSU;
 374 msu             return MSU;
 375 hfisu           return HFISU;
 376 hlssu           return HLSSU;
 377 hmsu            return HMSU;
 378 sio             return SIO;
 379 opc             return OPC;
 380 dpc             return DPC;
 381 sls             return SLS;
 382 hsio            return HSIO;
 383 hopc            return HOPC;
 384 hdpc            return HDPC;
 385 hsls            return HSLS;
 386
 387 [ \r\n\t]               ;
 388 [+\-*/%:\[\]!<>()&|\^=] return yytext[0];
 389 ">="                    return GEQ;
 390 "<="                    return LEQ;
 391 "!="                    return NEQ;
 392 "=="                    return '=';
 393 "<<"                    return LSH;
 394 ">>"                    return RSH;
 395 ${B}                    { yylval->e = pcap_ether_aton(((char *)yytext)+1);
 396                           if (yylval->e == NULL)
 397                                 bpf_error(yyextra, "malloc");
 398                           return AID; }
 399 {MAC}                   { yylval->e = pcap_ether_aton((char *)yytext);
 400                           if (yylval->e == NULL)
 401                                 bpf_error(yyextra, "malloc");
 402                           return EID; }
 403 {N}                     { yylval->i = stoi((char *)yytext); return NUM; }
 404 ({N}\.{N})|({N}\.{N}\.{N})|({N}\.{N}\.{N}\.{N}) {
 405                         yylval->s = sdup(yyextra, (char *)yytext); return HID; }
 406 {V6}                    {
 407 #ifdef INET6
 408                           struct addrinfo hints, *res;
 409                           memset(&hints, 0, sizeof(hints));
 410                           hints.ai_family = AF_INET6;
 411                           hints.ai_flags = AI_NUMERICHOST;
 412                           if (getaddrinfo(yytext, NULL, &hints, &res))
 413                                 bpf_error(yyextra, "bogus IPv6 address %s", yytext);
 414                           else {
 415                                 freeaddrinfo(res);
 416                                 yylval->s = sdup(yyextra, (char *)yytext); return HID6;
 417                           }
 418 #else
 419                           bpf_error(yyextra, "IPv6 address %s not supported", yytext);
 420 #endif /*INET6*/
 421                         }
 422 {B}:+({B}:+)+           { bpf_error(yyextra, "bogus ethernet address %s", yytext); }
 423 icmptype                { yylval->i = 0; return NUM; }
 424 icmpcode                { yylval->i = 1; return NUM; }
 425 icmp-echoreply          { yylval->i = 0; return NUM; }
 426 icmp-unreach            { yylval->i = 3; return NUM; }
 427 icmp-sourcequench       { yylval->i = 4; return NUM; }
 428 icmp-redirect           { yylval->i = 5; return NUM; }
 429 icmp-echo               { yylval->i = 8; return NUM; }
 430 icmp-routeradvert       { yylval->i = 9; return NUM; }
 431 icmp-routersolicit      { yylval->i = 10; return NUM; }
 432 icmp-timxceed           { yylval->i = 11; return NUM; }
 433 icmp-paramprob          { yylval->i = 12; return NUM; }
 434 icmp-tstamp             { yylval->i = 13; return NUM; }
 435 icmp-tstampreply        { yylval->i = 14; return NUM; }
 436 icmp-ireq               { yylval->i = 15; return NUM; }
 437 icmp-ireqreply          { yylval->i = 16; return NUM; }
 438 icmp-maskreq            { yylval->i = 17; return NUM; }
 439 icmp-maskreply          { yylval->i = 18; return NUM; }
 440 tcpflags                { yylval->i = 13; return NUM; }
 441 tcp-fin                 { yylval->i = 0x01; return NUM; }
 442 tcp-syn                 { yylval->i = 0x02; return NUM; }
 443 tcp-rst                 { yylval->i = 0x04; return NUM; }
 444 tcp-push                { yylval->i = 0x08; return NUM; }
 445 tcp-ack                 { yylval->i = 0x10; return NUM; }
 446 tcp-urg                 { yylval->i = 0x20; return NUM; }
 447 tcp-ece                 { yylval->i = 0x40; return NUM; }
 448 tcp-cwr                 { yylval->i = 0x80; return NUM; }
 449 [A-Za-z0-9]([-_.A-Za-z0-9]*[.A-Za-z0-9])? {
 450                          yylval->s = sdup(yyextra, (char *)yytext); return ID; }
 451 "\\"[^ !()\n\t]+        { yylval->s = sdup(yyextra, (char *)yytext + 1); return ID; }
 452 [^ \[\]\t\n\-_.A-Za-z0-9!<>()&|=]+ {
 453                         bpf_error(yyextra, "illegal token: %s", yytext); }
 454 .                       { bpf_error(yyextra, "illegal char '%c'", *yytext); }
 455 %%
 456
 457 /* Hex digit to integer. */
 458 static inline int
 459 xdtoi(c)
 460         register int c;
 461 {
 462         if (isdigit(c))
 463                 return c - '0';
 464         else if (islower(c))
 465                 return c - 'a' + 10;
 466         else
 467                 return c - 'A' + 10;
 468 }
 469
 470 /*
 471  * Convert string to integer.  Just like atoi(), but checks for
 472  * preceding 0x or 0 and uses hex or octal instead of decimal.
 473  */
 474 static int
 475 stoi(s)
 476         char *s;
 477 {
 478         int base = 10;
 479         int n = 0;
 480
 481         if (*s == '0') {
 482                 if (s[1] == 'x' || s[1] == 'X') {
 483                         s += 2;
 484                         base = 16;
 485                 }
 486                 else {
 487                         base = 8;
 488                         s += 1;
 489                 }
 490         }
 491         while (*s)
 492                 n = n * base + xdtoi(*s++);
 493
 494         return n;
 495 }