/*
 *  Copyright (C) 2007-2009 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 __CLAMAV_H
#define __CLAMAV_H

#include <sys/types.h>
#include <sys/stat.h>

#ifdef __cplusplus
extern "C"
{
#endif

#define CL_COUNT_PRECISION 4096

/* return codes */
typedef enum {
    /* libclamav specific */
    CL_CLEAN = 0,
    CL_SUCCESS = 0,
    CL_VIRUS,
    CL_ENULLARG,
    CL_EARG,
    CL_EMALFDB,
    CL_ECVD,
    CL_EVERIFY,
    CL_EUNPACK,

    /* I/O and memory errors */
    CL_EOPEN,
    CL_ECREAT,
    CL_EUNLINK,
    CL_ESTAT,
    CL_EREAD,
    CL_ESEEK,
    CL_EWRITE,
    CL_EDUP,
    CL_EACCES,
    CL_ETMPFILE,
    CL_ETMPDIR,
    CL_EMAP,
    CL_EMEM,
    CL_ETIMEOUT,

    /* internal (not reported outside libclamav) */
    CL_BREAK,
    CL_EMAXREC,
    CL_EMAXSIZE,
    CL_EMAXFILES,
    CL_EFORMAT,
    CL_EBYTECODE,/* may be reported in testmode */
    CL_EBYTECODE_TESTFAIL, /* may be reported in testmode */

    /* no error codes below this line please */
    CL_ELAST_ERROR
} cl_error_t;

/* db options */
#define CL_DB_PHISHING	    0x2
#define CL_DB_PHISHING_URLS 0x8
#define CL_DB_PUA	    0x10
#define CL_DB_CVDNOTMP	    0x20    /* obsolete */
#define CL_DB_OFFICIAL	    0x40    /* internal */
#define CL_DB_PUA_MODE	    0x80
#define CL_DB_PUA_INCLUDE   0x100
#define CL_DB_PUA_EXCLUDE   0x200
#define CL_DB_COMPILED	    0x400   /* internal */
#define CL_DB_DIRECTORY	    0x800   /* internal */
#define CL_DB_OFFICIAL_ONLY 0x1000
#define CL_DB_BYTECODE      0x2000
#define CL_DB_SIGNED	    0x4000  /* internal */

/* recommended db settings */
#define CL_DB_STDOPT	    (CL_DB_PHISHING | CL_DB_PHISHING_URLS | CL_DB_BYTECODE)

/* scan options */
#define CL_SCAN_RAW			0x0
#define CL_SCAN_ARCHIVE			0x1
#define CL_SCAN_MAIL			0x2
#define CL_SCAN_OLE2			0x4
#define CL_SCAN_BLOCKENCRYPTED		0x8
#define CL_SCAN_HTML			0x10
#define CL_SCAN_PE			0x20
#define CL_SCAN_BLOCKBROKEN		0x40
#define CL_SCAN_MAILURL			0x80 /* ignored */
#define CL_SCAN_BLOCKMAX		0x100 /* ignored */
#define CL_SCAN_ALGORITHMIC		0x200
#define CL_SCAN_PHISHING_BLOCKSSL	0x800 /* ssl mismatches, not ssl by itself*/
#define CL_SCAN_PHISHING_BLOCKCLOAK	0x1000
#define CL_SCAN_ELF			0x2000
#define CL_SCAN_PDF			0x4000
#define CL_SCAN_STRUCTURED		0x8000
#define CL_SCAN_STRUCTURED_SSN_NORMAL	0x10000
#define CL_SCAN_STRUCTURED_SSN_STRIPPED	0x20000
#define CL_SCAN_PARTIAL_MESSAGE         0x40000
#define CL_SCAN_HEURISTIC_PRECEDENCE    0x80000
#define CL_SCAN_BLOCKMACROS		0x100000

#define CL_SCAN_INTERNAL_COLLECT_SHA    0x80000000 /* Enables hash output in sha-collect builds - for internal use only */

/* recommended scan settings */
#define CL_SCAN_STDOPT		(CL_SCAN_ARCHIVE | CL_SCAN_MAIL | CL_SCAN_OLE2 | CL_SCAN_PDF | CL_SCAN_HTML | CL_SCAN_PE | CL_SCAN_ALGORITHMIC | CL_SCAN_ELF)

/* cl_countsigs options */
#define CL_COUNTSIGS_OFFICIAL	    0x1
#define CL_COUNTSIGS_UNOFFICIAL	    0x2
#define CL_COUNTSIGS_ALL	    (CL_COUNTSIGS_OFFICIAL | CL_COUNTSIGS_UNOFFICIAL)

struct cl_engine;
struct cl_settings;

#define CL_INIT_DEFAULT	0x0
extern int cl_init(unsigned int initoptions);

extern struct cl_engine *cl_engine_new(void);

enum cl_engine_field {
    CL_ENGINE_MAX_SCANSIZE,	    /* uint64_t */
    CL_ENGINE_MAX_FILESIZE,	    /* uint64_t */
    CL_ENGINE_MAX_RECURSION,	    /* uint32_t	*/
    CL_ENGINE_MAX_FILES,	    /* uint32_t */
    CL_ENGINE_MIN_CC_COUNT,	    /* uint32_t */
    CL_ENGINE_MIN_SSN_COUNT,	    /* uint32_t */
    CL_ENGINE_PUA_CATEGORIES,	    /* (char *) */
    CL_ENGINE_DB_OPTIONS,	    /* uint32_t */
    CL_ENGINE_DB_VERSION,	    /* uint32_t */
    CL_ENGINE_DB_TIME,		    /* time_t */
    CL_ENGINE_AC_ONLY,		    /* uint32_t */
    CL_ENGINE_AC_MINDEPTH,	    /* uint32_t */
    CL_ENGINE_AC_MAXDEPTH,	    /* uint32_t */
    CL_ENGINE_TMPDIR,		    /* (char *) */
    CL_ENGINE_KEEPTMP,		    /* uint32_t */
    CL_ENGINE_BYTECODE_SECURITY,    /* uint32_t */
    CL_ENGINE_BYTECODE_TIMEOUT,     /* uint32_t */
    CL_ENGINE_BYTECODE_MODE         /* uint32_t */
};

enum bytecode_security {
    CL_BYTECODE_TRUST_ALL=0, /* insecure, debug setting */
    CL_BYTECODE_TRUST_SIGNED, /* default */
    CL_BYTECODE_TRUST_NOTHING /* paranoid setting */
};

enum bytecode_mode {
    CL_BYTECODE_MODE_AUTO=0, /* JIT if possible, fallback to interpreter */
    CL_BYTECODE_MODE_JIT, /* force JIT */
    CL_BYTECODE_MODE_INTERPRETER, /* force interpreter */
    CL_BYTECODE_MODE_TEST, /* both JIT and interpreter, compare results,
			      all failures are fatal */
    CL_BYTECODE_MODE_OFF /* for query only, not settable */
};

extern int cl_engine_set_num(struct cl_engine *engine, enum cl_engine_field field, long long num);

extern long long cl_engine_get_num(const struct cl_engine *engine, enum cl_engine_field field, int *err);

extern int cl_engine_set_str(struct cl_engine *engine, enum cl_engine_field field, const char *str);

extern const char *cl_engine_get_str(const struct cl_engine *engine, enum cl_engine_field field, int *err);

extern struct cl_settings *cl_engine_settings_copy(const struct cl_engine *engine);

extern int cl_engine_settings_apply(struct cl_engine *engine, const struct cl_settings *settings);

extern int cl_engine_settings_free(struct cl_settings *settings);

extern int cl_engine_compile(struct cl_engine *engine);

extern int cl_engine_addref(struct cl_engine *engine);

extern int cl_engine_free(struct cl_engine *engine);


/* CALLBACKS - WARNING: unstable API - WIP */


typedef cl_error_t (*clcb_pre_scan)(int fd, void *context);
/* PRE-SCAN
Input:
fd      = File descriptor which is about to be scanned
context = Opaque application provided data

Output:
CL_CLEAN = File is scanned
CL_BREAK = Whitelisted by callback - file is skipped and marked as clean
CL_VIRUS = Blacklisted by callback - file is skipped and marked as infected
*/
extern void cl_engine_set_clcb_pre_scan(struct cl_engine *engine, clcb_pre_scan callback);


typedef cl_error_t (*clcb_post_scan)(int fd, int result, const char *virname, void *context);
/* POST-SCAN
Input:
fd      = File descriptor which is was scanned
result  = The scan result for the file
virname = Virus name if infected
context = Opaque application provided data

Output:
CL_CLEAN = Scan result is not overridden
CL_BREAK = Whitelisted by callback - scan result is set to CL_CLEAN
CL_VIRUS = Blacklisted by callback - scan result is set to CL_VIRUS
*/
extern void cl_engine_set_clcb_post_scan(struct cl_engine *engine, clcb_post_scan callback);


typedef int (*clcb_sigload)(const char *type, const char *name, void *context);
/* SIGNATURE LOAD
Input:
type = The signature type (e.g. "db", "ndb", "mdb", etc.)
name = The virus name
context = Opaque application provided data

Output:
0     = Load the current signature
Non 0 = Skip the current signature

WARNING: Some signatures (notably ldb, cbc) can be dependent upon other signatures.
         Failure to preserve dependency chains will result in database loading failure.
         It is the implementor's responsibility to guarantee consistency.
*/
extern void cl_engine_set_clcb_sigload(struct cl_engine *engine, clcb_sigload callback, void *context);

/* LibClamAV messages callback
 * The specified callback will be called instead of logging to stderr.
 * Messages of lower severity than specified are logged as usual.
 *
 * Just like with cl_debug() this must be called before going multithreaded.
 * Callable before cl_init, if you want to log messages from cl_init() itself.
 *
 * You can use context of cl_scandesc_callback to convey more information to the callback (such as the filename!)
 * Note: setting a 2nd callbacks overwrites previous, multiple callbacks are not
 * supported
 */
enum cl_msg {
    /* leave room for more message levels in the future */
    CL_MSG_INFO_VERBOSE = 32, /* verbose */
    CL_MSG_WARN = 64, /* LibClamAV WARNING: */
    CL_MSG_ERROR = 128/* LibClamAV ERROR: */
};
typedef void (*clcb_msg)(enum cl_msg severity, const char *fullmsg, const char *msg, void *context);
extern void cl_set_clcb_msg(clcb_msg callback);

/* LibClamAV hash stats callback */
typedef void (*clcb_hash)(int fd, unsigned long long size, const unsigned char *md5, const char *virname, void *context);
extern void cl_engine_set_clcb_hash(struct cl_engine *engine, clcb_hash callback);

struct cl_stat {
    char *dir;
    struct stat *stattab;
    char **statdname;
    unsigned int entries;
};

struct cl_cvd {		    /* field no. */
    char *time;		    /* 2 */
    unsigned int version;   /* 3 */
    unsigned int sigs;	    /* 4 */
    unsigned int fl;	    /* 5 */
			    /* padding */
    char *md5;		    /* 6 */
    char *dsig;		    /* 7 */
    char *builder;	    /* 8 */
    unsigned int stime;	    /* 9 */
};

/* file scanning */
extern int cl_scandesc(int desc, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions);
extern int cl_scandesc_callback(int desc, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context);

extern int cl_scanfile(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions);
extern int cl_scanfile_callback(const char *filename, const char **virname, unsigned long int *scanned, const struct cl_engine *engine, unsigned int scanoptions, void *context);

/* database handling */
extern int cl_load(const char *path, struct cl_engine *engine, unsigned int *signo, unsigned int dboptions);
extern const char *cl_retdbdir(void);

/* engine handling */

/* CVD */
extern struct cl_cvd *cl_cvdhead(const char *file);
extern struct cl_cvd *cl_cvdparse(const char *head);
extern int cl_cvdverify(const char *file);
extern void cl_cvdfree(struct cl_cvd *cvd);

/* db dir stat functions */
extern int cl_statinidir(const char *dirname, struct cl_stat *dbstat);
extern int cl_statchkdir(const struct cl_stat *dbstat);
extern int cl_statfree(struct cl_stat *dbstat);

/* count signatures */
extern int cl_countsigs(const char *path, unsigned int countoptions, unsigned int *sigs);

/* enable debug messages */
extern void cl_debug(void);

/* software versions */
extern unsigned int cl_retflevel(void);
extern const char *cl_retver(void);

/* others */
extern const char *cl_strerror(int clerror);

#ifdef __cplusplus
}
#endif
 
#endif /* __CLAMAV_H */
