/* 
** ZABBIX
** Copyright (C) 2000-2005 SIA Zabbix
**
** This program is free software; you can redistribute it and/or modify
** it under the terms of the GNU General Public License as published by
** the Free Software Foundation; either version 2 of the License, or
** (at your option) any later version.
**
** 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., 675 Mass Ave, Cambridge, MA 02139, USA.
**/

#include "common.h"
#include "sysinfo.h"
#include "log.h"

#include "md5.h"

#include "file.h"

int	VFS_FILE_SIZE(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	struct stat	buf;
	char		filename[MAX_STRING_LEN];

        assert(result);

        init_result(result);

        if (num_param(param) > 1)
                return SYSINFO_RET_FAIL;

        if (0 != get_param(param, 1, filename, MAX_STRING_LEN))
                return SYSINFO_RET_FAIL;

	if (0 != stat(filename, &buf))
		return SYSINFO_RET_FAIL;

	zabbix_log(LOG_LEVEL_DEBUG, ZBX_FS_UI64, buf.st_size);
	SET_UI64_RESULT(result, buf.st_size);

	return SYSINFO_RET_OK;
}

int	VFS_FILE_TIME(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	struct stat	buf;
	char    filename[MAX_STRING_LEN];
	char    type[MAX_STRING_LEN];
	int	ret = SYSINFO_RET_FAIL;

        assert(result);

        init_result(result);

        if(num_param(param) > 2)
        {
                return SYSINFO_RET_FAIL;
        }

        if(get_param(param, 1, filename, MAX_STRING_LEN) != 0)
        {
                return SYSINFO_RET_FAIL;
        }
	
        if(get_param(param, 2, type, MAX_STRING_LEN) != 0)
        {
                type[0] = '\0';
        }

	if(type[0] == '\0')
	{
		strscpy(type, "modify");
	}
	
	if(stat(filename,&buf) == 0)
	{
		if(strcmp(type,"modify") == 0)
		{
			SET_UI64_RESULT(result, buf.st_mtime);
			ret = SYSINFO_RET_OK;
		}
		else if(strcmp(type,"access") == 0)
		{
			SET_UI64_RESULT(result, buf.st_atime);
			ret = SYSINFO_RET_OK;
		}
		else if(strcmp(type,"change") == 0)
		{
			SET_UI64_RESULT(result, buf.st_ctime);
			ret = SYSINFO_RET_OK;
		}
	}
	return	ret;
}

int	VFS_FILE_EXISTS(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	struct stat	buf;
	char		filename[MAX_STRING_LEN];

        assert(result);

        init_result(result);

        if (num_param(param) > 1)
                return SYSINFO_RET_FAIL;

        if (0 != get_param(param, 1, filename, sizeof(filename)))
                return SYSINFO_RET_FAIL;

	SET_UI64_RESULT(result, 0);

	if (0 == stat(filename, &buf))	/* File exists */
		if (S_ISREG(buf.st_mode))	/* Regular file */
			SET_UI64_RESULT(result, 1);

	return SYSINFO_RET_OK;
}

/* #include<malloc.h> */

int	VFS_FILE_REGEXP(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	char	filename[MAX_STRING_LEN];
	char	regexp[MAX_STRING_LEN];
	FILE	*f = NULL;
	int	len;
	char	tmp[MAX_STRING_LEN];
	char	*c;

	char	*buf = NULL;

        assert(result);

        init_result(result);

	memset(tmp,0,MAX_STRING_LEN);

	if(get_param(param, 1, filename, MAX_STRING_LEN) != 0)
	{
		return SYSINFO_RET_FAIL;
	}

	if(get_param(param, 2, regexp, MAX_STRING_LEN) != 0)
	{
		return SYSINFO_RET_FAIL;
	}


	if(NULL == (f = fopen(filename,"r")))
	{
		return SYSINFO_RET_FAIL;
	}

	if(NULL == (buf = (char*)calloc((size_t)MAX_FILE_LEN, 1)))
	{
		goto lbl_fail;
	}

	if(0 == fread(buf, 1, MAX_FILE_LEN-1, f))
	{
		goto lbl_fail;
	}
	buf[MAX_FILE_LEN-1] = 0;

 	zbx_fclose(f);

	c = zbx_regexp_match(buf, regexp, &len);

	if(c == NULL)
	{
		tmp[0]=0;
	}
	else
	{
		zbx_strlcpy(tmp,c,len+1);
	}

	SET_STR_RESULT(result, strdup(tmp));

	zbx_free(buf);

	return	SYSINFO_RET_OK;

lbl_fail:

	zbx_free(buf);
	zbx_fclose(f);

	return	SYSINFO_RET_FAIL;
}

int	VFS_FILE_REGMATCH(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	char	filename[MAX_STRING_LEN];
	char	regexp[MAX_STRING_LEN];
	FILE	*f = NULL;
	int	len;
	char	*c;

	char	*buf = NULL;

        assert(result);

        init_result(result);

	if(get_param(param, 1, filename, MAX_STRING_LEN) != 0)
	{
		return SYSINFO_RET_FAIL;
	}

	if(get_param(param, 2, regexp, MAX_STRING_LEN) != 0)
	{
		return SYSINFO_RET_FAIL;
	}


	if(NULL == (f = fopen(filename,"r")))
	{
		return SYSINFO_RET_FAIL;
	}

	if(NULL == (buf = (char*)calloc((size_t)MAX_FILE_LEN, 1)))
	{
		goto lbl_fail;
	}

	if(0 == fread(buf, 1, MAX_FILE_LEN-1, f))
	{
		goto lbl_fail;
	}
	buf[MAX_FILE_LEN-1] = 0;

	zbx_fclose(f);

	c = zbx_regexp_match(buf, regexp, &len);

	if(c == NULL)
	{
		SET_UI64_RESULT(result, 0);
	}
	else
	{
		SET_UI64_RESULT(result, 1);
	}

	zbx_free(buf);

	return	SYSINFO_RET_OK;

lbl_fail:

	zbx_free(buf);
	zbx_fclose(f);

	return	SYSINFO_RET_FAIL;
}

/* MD5 sum calculation */

int	VFS_FILE_MD5SUM(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	FILE	*file = NULL;
	int	i;
	size_t	nr;
	struct stat	buf_stat;

        md5_state_t state;
	u_char	buf[16 * 1024];

	unsigned char	hashText[MD5_DIGEST_SIZE*2+1];
	md5_byte_t	hash[MD5_DIGEST_SIZE];

	char filename[MAX_STRING_LEN];
	
	assert(result);
	
        init_result(result);	

        if(num_param(param) > 1)
        {
                return SYSINFO_RET_FAIL;
        }

        if(get_param(param, 1, filename, MAX_STRING_LEN) != 0)
        {
                return SYSINFO_RET_FAIL;
        }
	
	if(stat(filename,&buf_stat) != 0)
	{
		/* Cannot stat() file */
		return	SYSINFO_RET_FAIL;
	}

	if(buf_stat.st_size > 64*1024*1024)
	{
		/* Will not calculate MD5 for files larger than 64M */
		return	SYSINFO_RET_FAIL;
	}

	if(NULL == (file = fopen(filename,"rb")))
	{
		return	SYSINFO_RET_FAIL;
	}

        md5_init(&state);
	while ((nr = fread(buf, 1, (size_t)sizeof(buf), file)) > 0)
	{
        	md5_append(&state,(const md5_byte_t *)buf, (int)nr);
	}
        md5_finish(&state, hash);

	zbx_fclose(file);

/* Convert MD5 hash to text form */
	for(i=0;i<MD5_DIGEST_SIZE;i++)
	{
		zbx_snprintf((char *)&hashText[i<<1], sizeof(hashText) - (i<<1), "%02x",hash[i]);
	}
	
	SET_STR_RESULT(result, strdup((char*)hashText));

	return SYSINFO_RET_OK;

}

/* Code for cksum is based on code from cksum.c */

static u_long crctab[] = {
	0x0,
	0x04c11db7, 0x09823b6e, 0x0d4326d9, 0x130476dc, 0x17c56b6b,
	0x1a864db2, 0x1e475005, 0x2608edb8, 0x22c9f00f, 0x2f8ad6d6,
	0x2b4bcb61, 0x350c9b64, 0x31cd86d3, 0x3c8ea00a, 0x384fbdbd,
	0x4c11db70, 0x48d0c6c7, 0x4593e01e, 0x4152fda9, 0x5f15adac,
	0x5bd4b01b, 0x569796c2, 0x52568b75, 0x6a1936c8, 0x6ed82b7f,
	0x639b0da6, 0x675a1011, 0x791d4014, 0x7ddc5da3, 0x709f7b7a,
	0x745e66cd, 0x9823b6e0, 0x9ce2ab57, 0x91a18d8e, 0x95609039,
	0x8b27c03c, 0x8fe6dd8b, 0x82a5fb52, 0x8664e6e5, 0xbe2b5b58,
	0xbaea46ef, 0xb7a96036, 0xb3687d81, 0xad2f2d84, 0xa9ee3033,
	0xa4ad16ea, 0xa06c0b5d, 0xd4326d90, 0xd0f37027, 0xddb056fe,
	0xd9714b49, 0xc7361b4c, 0xc3f706fb, 0xceb42022, 0xca753d95,
	0xf23a8028, 0xf6fb9d9f, 0xfbb8bb46, 0xff79a6f1, 0xe13ef6f4,
	0xe5ffeb43, 0xe8bccd9a, 0xec7dd02d, 0x34867077, 0x30476dc0,
	0x3d044b19, 0x39c556ae, 0x278206ab, 0x23431b1c, 0x2e003dc5,
	0x2ac12072, 0x128e9dcf, 0x164f8078, 0x1b0ca6a1, 0x1fcdbb16,
	0x018aeb13, 0x054bf6a4, 0x0808d07d, 0x0cc9cdca, 0x7897ab07,
	0x7c56b6b0, 0x71159069, 0x75d48dde, 0x6b93dddb, 0x6f52c06c,
	0x6211e6b5, 0x66d0fb02, 0x5e9f46bf, 0x5a5e5b08, 0x571d7dd1,
	0x53dc6066, 0x4d9b3063, 0x495a2dd4, 0x44190b0d, 0x40d816ba,
	0xaca5c697, 0xa864db20, 0xa527fdf9, 0xa1e6e04e, 0xbfa1b04b,
	0xbb60adfc, 0xb6238b25, 0xb2e29692, 0x8aad2b2f, 0x8e6c3698,
	0x832f1041, 0x87ee0df6, 0x99a95df3, 0x9d684044, 0x902b669d,
	0x94ea7b2a, 0xe0b41de7, 0xe4750050, 0xe9362689, 0xedf73b3e,
	0xf3b06b3b, 0xf771768c, 0xfa325055, 0xfef34de2, 0xc6bcf05f,
	0xc27dede8, 0xcf3ecb31, 0xcbffd686, 0xd5b88683, 0xd1799b34,
	0xdc3abded, 0xd8fba05a, 0x690ce0ee, 0x6dcdfd59, 0x608edb80,
	0x644fc637, 0x7a089632, 0x7ec98b85, 0x738aad5c, 0x774bb0eb,
	0x4f040d56, 0x4bc510e1, 0x46863638, 0x42472b8f, 0x5c007b8a,
	0x58c1663d, 0x558240e4, 0x51435d53, 0x251d3b9e, 0x21dc2629,
	0x2c9f00f0, 0x285e1d47, 0x36194d42, 0x32d850f5, 0x3f9b762c,
	0x3b5a6b9b, 0x0315d626, 0x07d4cb91, 0x0a97ed48, 0x0e56f0ff,
	0x1011a0fa, 0x14d0bd4d, 0x19939b94, 0x1d528623, 0xf12f560e,
	0xf5ee4bb9, 0xf8ad6d60, 0xfc6c70d7, 0xe22b20d2, 0xe6ea3d65,
	0xeba91bbc, 0xef68060b, 0xd727bbb6, 0xd3e6a601, 0xdea580d8,
	0xda649d6f, 0xc423cd6a, 0xc0e2d0dd, 0xcda1f604, 0xc960ebb3,
	0xbd3e8d7e, 0xb9ff90c9, 0xb4bcb610, 0xb07daba7, 0xae3afba2,
	0xaafbe615, 0xa7b8c0cc, 0xa379dd7b, 0x9b3660c6, 0x9ff77d71,
	0x92b45ba8, 0x9675461f, 0x8832161a, 0x8cf30bad, 0x81b02d74,
	0x857130c3, 0x5d8a9099, 0x594b8d2e, 0x5408abf7, 0x50c9b640,
	0x4e8ee645, 0x4a4ffbf2, 0x470cdd2b, 0x43cdc09c, 0x7b827d21,
	0x7f436096, 0x7200464f, 0x76c15bf8, 0x68860bfd, 0x6c47164a,
	0x61043093, 0x65c52d24, 0x119b4be9, 0x155a565e, 0x18197087,
	0x1cd86d30, 0x029f3d35, 0x065e2082, 0x0b1d065b, 0x0fdc1bec,
	0x3793a651, 0x3352bbe6, 0x3e119d3f, 0x3ad08088, 0x2497d08d,
	0x2056cd3a, 0x2d15ebe3, 0x29d4f654, 0xc5a92679, 0xc1683bce,
	0xcc2b1d17, 0xc8ea00a0, 0xd6ad50a5, 0xd26c4d12, 0xdf2f6bcb,
	0xdbee767c, 0xe3a1cbc1, 0xe760d676, 0xea23f0af, 0xeee2ed18,
	0xf0a5bd1d, 0xf464a0aa, 0xf9278673, 0xfde69bc4, 0x89b8fd09,
	0x8d79e0be, 0x803ac667, 0x84fbdbd0, 0x9abc8bd5, 0x9e7d9662,
	0x933eb0bb, 0x97ffad0c, 0xafb010b1, 0xab710d06, 0xa6322bdf,
	0xa2f33668, 0xbcb4666d, 0xb8757bda, 0xb5365d03, 0xb1f740b4
};

/*
 * Compute a POSIX 1003.2 checksum.  These routines have been broken out so
 * that other programs can use them.  The first routine, crc(), takes a file
 * descriptor to read from and locations to store the crc and the number of
 * bytes read.  The second routine, crc_buf(), takes a buffer and a length,
 * and a location to store the crc.  Both routines return 0 on success and 1
 * on failure.  Errno is set on failure.
 */

int	VFS_FILE_CKSUM(const char *cmd, const char *param, unsigned flags, AGENT_RESULT *result)
{
	register u_char *p;
	register int nr;

/*	AV Crashed under 64 platforms. Must be 32 bit! */
/*	register u_long crc, len;*/
	register uint32_t crc, len;

	u_char buf[16 * 1024];
	u_long cval, clen;
	FILE	*f;
	char	filename[MAX_STRING_LEN];

	assert(result);

        init_result(result);	

	if(num_param(param) > 1)
        {
                return SYSINFO_RET_FAIL;
        }

        if(get_param(param, 1, filename, MAX_STRING_LEN) != 0)
        {
                return SYSINFO_RET_FAIL;
        }	
		
	if(NULL == (f = fopen(filename,"rb")))
	{
		return	SYSINFO_RET_FAIL;
	}

#define	COMPUTE(var, ch)	(var) = (var) << 8 ^ crctab[(var) >> 24 ^ (ch)]

	crc = len = 0;
	while ((nr = (int)fread(buf, 1, sizeof(buf), f)) > 0)
	{
		for( len += nr, p = buf; nr--; ++p)
		{
			COMPUTE(crc, *p);
		}
	}
	zbx_fclose(f);
	
	if (nr < 0)
	{
		return	SYSINFO_RET_FAIL;
	}

	clen = len;

	/* Include the length of the file. */
	for (; len != 0; len >>= 8) {
		COMPUTE(crc, len & 0xff);
	}

	cval = ~crc;

	SET_UI64_RESULT(result, cval);

	return	SYSINFO_RET_OK;
}
