/*

  *  Copyright (C) 2013-2019 Cisco Systems, Inc. and/or its affiliates. All rights reserved.

  *  Copyright (C) 2007-2013 Sourcefire, Inc.

  *

  *  Authors: Tomasz Kojm

  *
  *  This program is free software; you can redistribute it and/or modify

  *  it under the terms of the GNU General Public License version 2 as
  *  published by the Free Software Foundation.

  *
  *  This program is distributed in the hope that it will be useful,
  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  *  GNU General Public License for more details.
  *
  *  You should have received a copy of the GNU General Public License
  *  along with this program; if not, write to the Free Software

  *  Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston,
  *  MA 02110-1301, USA.

  */
 
 #ifndef __MATCHER_H
 #define __MATCHER_H
 

 #include <sys/types.h>
 

 #include "clamav.h"

 #include "filetypes.h"

 #include "others.h"

 #include "execs.h"

 struct cli_target_info {
     off_t fsize;
     struct cli_exe_info exeinfo;
     int status; /* 0 == not initialised, 1 == initialised OK, -1 == error */
 };
 

 #include "matcher-ac.h"
 #include "matcher-bm.h"

 #include "matcher-hash.h"

 #include "matcher-pcre.h"

 #include "matcher-byte-comp.h"

 #include "regex_pcre.h"

 #include "fmap.h"

 #include "mpool.h"
 

 #define CLI_MATCH_METADATA	0xff00
 #define CLI_MATCH_WILDCARD	0x0f00

 #define CLI_MATCH_CHAR		0x0000

 #define CLI_MATCH_NOCASE	0x1000

 #define CLI_MATCH_IGNORE	0x0100

 #define CLI_MATCH_SPECIAL	0x0200

 #define CLI_MATCH_NIBBLE_HIGH	0x0300
 #define CLI_MATCH_NIBBLE_LOW	0x0400
 

 struct cli_lsig_tdb {

 #define CLI_TDB_UINT		0
 #define CLI_TDB_RANGE		1
 #define CLI_TDB_STR		2
 #define CLI_TDB_RANGE2		3
 #define CLI_TDB_FTYPE		4
 #define CLI_TDB_FTYPE_EXPR	5

     uint32_t *val, *range;
     char *str;
     uint32_t cnt[3];

     uint32_t subsigs;

 
     const uint32_t *target;

     const uint32_t *engine, *nos, *ep, *filesize;

     const uint32_t *container, *handlertype;

     const uint32_t *intermediates;

     /*

     const uint32_t *sectoff, *sectrva, *sectvsz, *sectraw, *sectrsz,
 		   *secturva, *sectuvsz, *secturaw, *sectursz;

     */
     const char *icongrp1, *icongrp2;

     uint32_t *macro_ptids;

 #ifdef USE_MPOOL

     mpool_t *mempool;

 #endif

 };
 

 #define CLI_LSIG_FLAG_PRIVATE 0x01
 

 struct cli_bc;

 struct cli_ac_lsig {

 #define CLI_LSIG_NORMAL 0
 #define CLI_YARA_NORMAL 1
 #define CLI_YARA_OFFSET 2

     uint32_t id;

     unsigned bc_idx;

     uint8_t type;

     uint8_t flag;

     union {
         char *logic;

         uint8_t *code_start;

     } u;

     const char *virname;
     struct cli_lsig_tdb tdb;
 };
 

 struct cli_matcher {

     unsigned int type;
 

     /* Extended Boyer-Moore */

     uint8_t *bm_shift;

     struct cli_bm_patt **bm_suffix, **bm_pattab;

     uint32_t *soff, soff_len; /* for PE section sigs */

     uint32_t bm_offmode, bm_patterns, bm_reloff_num, bm_absoff_num;

     /* HASH */

     struct cli_hash_patt hm;

     struct cli_hash_wild hwild;

     /* Extended Aho-Corasick */

     uint32_t ac_partsigs, ac_nodes, ac_lists, ac_patterns, ac_lsigs;

     struct cli_ac_lsig **ac_lsigtable;

     struct cli_ac_node *ac_root, **ac_nodetable;

     struct cli_ac_list **ac_listtable;

     struct cli_ac_patt **ac_pattable;

     struct cli_ac_patt **ac_reloff;

     uint32_t ac_reloff_num, ac_absoff_num;

     uint8_t ac_mindepth, ac_maxdepth;

     struct filter *filter;

 
     uint16_t maxpatlen;

     uint8_t ac_only;

 
     /* Perl-Compiled Regular Expressions */

 #if HAVE_PCRE

     uint32_t pcre_metas;
     struct cli_pcre_meta **pcre_metatable;

     uint32_t pcre_reloff_num, pcre_absoff_num;

 #endif

     /* Byte Compare */
     uint32_t bcomp_metas;
     struct cli_bcomp_meta **bcomp_metatable;
 

     /* Bytecode Tracker */
     uint32_t linked_bcs;
 

 #ifdef USE_MPOOL

     mpool_t *mempool;

 #endif

 };
 

 struct cli_cdb
 {

     char	        *virname;   /* virus name */
     cli_file_t	    ctype;	    /* container type */
     regex_t	        name;	    /* filename regex */
     size_t	        csize[2];   /* container size (min, max); if csize[0] != csize[1]
 			                     * then value of 0 makes the field ignored
 			                     */
     size_t	        fsizec[2];  /* file size in container */
     size_t	        fsizer[2];  /* real file size */
     int		        encrypted;  /* file is encrypted; 2 == ignore */
     unsigned int    filepos[2]; /* file position in container */
     int		        res1;	    /* reserved / format specific */
     void	        *res2;	    /* reserved / format specific */

 
     struct cli_cdb *next;
 };
 

 #define CLI_MAX_TARGETS 2 /* maximum filetypes for a specific target */

 struct cli_mtarget {

     cli_file_t target[CLI_MAX_TARGETS];

     const char *name;
     uint8_t idx;    /* idx of matcher */
     uint8_t ac_only;

     uint8_t enable_prefiltering;

     uint8_t target_count; /* must be synced with non-zero values in the target array */

 };
 

 #define CLI_MTARGETS 15

 static const struct cli_mtarget cli_mtargets[CLI_MTARGETS] =  {

     { {0, 0},                                   "GENERIC",      0,  0, 1, 1 },
     { {CL_TYPE_MSEXE, 0},                       "PE",           1,  0, 1, 1 },
     { {CL_TYPE_MSOLE2, 0},                      "OLE2",         2,  1, 0, 1 },
     { {CL_TYPE_HTML, 0},                        "HTML",         3,  1, 0, 1 },
     { {CL_TYPE_MAIL, 0},                        "MAIL",         4,  1, 1, 1 },
     { {CL_TYPE_GRAPHICS, 0},                    "GRAPHICS",     5,  1, 0, 1 },
     { {CL_TYPE_ELF, 0},                         "ELF",          6,  1, 0, 1 },
     { {CL_TYPE_TEXT_ASCII, 0},                  "ASCII",        7,  1, 1, 1 },
     { {CL_TYPE_ERROR, 0},                       "NOT USED",     8,  1, 0, 1 },
     { {CL_TYPE_MACHO, CL_TYPE_MACHO_UNIBIN},    "MACH-O",       9,  1, 0, 2 },
     { {CL_TYPE_PDF, 0},                         "PDF",         10,  1, 0, 1 },
     { {CL_TYPE_SWF, 0},                         "FLASH",       11,  1, 0, 1 },

     { {CL_TYPE_JAVA, 0},                        "JAVA",        12,  1, 0, 1 },

     { {CL_TYPE_INTERNAL, 0},                    "INTERNAL",    13,  1, 0, 1 },
     { {CL_TYPE_OTHER, 0},                       "OTHER",       14,  1, 0, 1 }

 };

 #define CLI_OFF_ANY         0xffffffff
 #define CLI_OFF_NONE	    0xfffffffe
 #define CLI_OFF_ABSOLUTE    1
 #define CLI_OFF_EOF_MINUS   2
 #define CLI_OFF_EP_PLUS     3
 #define CLI_OFF_EP_MINUS    4
 #define CLI_OFF_SL_PLUS     5
 #define CLI_OFF_SX_PLUS     6

 #define CLI_OFF_VERSION     7

 #define CLI_OFF_MACRO       8

 #define CLI_OFF_SE	    9

 int cli_scanbuff(const unsigned char *buffer, uint32_t length, uint32_t offset, cli_ctx *ctx, cli_file_t ftype, struct cli_ac_data **acdata);

 int cli_scandesc(int desc, cli_ctx *ctx, cli_file_t ftype, uint8_t ftonly, struct cli_matched_type **ftoffset, unsigned int acmode, struct cli_ac_result **acres);
 int cli_fmap_scandesc(cli_ctx *ctx, cli_file_t ftype, uint8_t ftonly, struct cli_matched_type **ftoffset, unsigned int acmode, struct cli_ac_result **acres, unsigned char *refhash);

 int cli_exp_eval(cli_ctx *ctx, struct cli_matcher *root, struct cli_ac_data *acdata, struct cli_target_info *target_info, const char *hash);

 int cli_caloff(const char *offstr, const struct cli_target_info *info, unsigned int target, uint32_t *offdata, uint32_t *offset_min, uint32_t *offset_max);

 int cli_checkfp(unsigned char *digest, size_t size, cli_ctx *ctx);

 int cli_checkfp_virus(unsigned char *digest, size_t size, cli_ctx *ctx, const char * vname);

 int cli_matchmeta(cli_ctx *ctx, const char *fname, size_t fsizec, size_t fsizer, int encrypted, unsigned int filepos, int res1, void *res2);

 void cli_targetinfo(struct cli_target_info *info, unsigned int target, fmap_t *map);
 

 #endif