/*
 * Name: SNiP II
 * Date: Tue Aug 15 14:04:52 2000
 * Author: pIGpEN [ pigpen@s0ftpj.org, deadhead@sikurezza.org ]
 *
 * SoftProject 2000 - Digital Sekurity for Y2k
 * Sikurezza.org - Italian Security MailingList
 *
 * COFFEE-WARE LICENSE - This source code is like "THE BEER-WARE LICENSE" by
 * Poul-Henning Kamp <phk@FreeBSD.ORG> but you can give me in return a coffee.
 *
 * Tested on: FreeBSD 4.0-RELEASE FreeBSD 4.0-RELEASE #45: Sat Au i386
 *
 * Snip for definition is coded during alcohol abuse ... This source can't have
 * a good style, logical parts or sense... I apologize... snip! ;)
 *
 */


#include <stdio.h>
#include <string.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <stdlib.h>
#include <dirent.h>

#define BFIART		"BFi"
#define	DIRNAME		"bfisrc"

#define BFISEP		"<-| "
#define BFIEND		"<-X->"
#define	BFISEP_LEN	strlen(BFISEP)
#define	BFIEND_LEN	strlen(BFIEND)

#define BUF_SIZE	1024

#ifndef S_ISDIR
# ifdef S_IFDIR
#  define S_ISDIR(i) (((i) & S_IFMT) == S_IFDIR)
# else 
#  define S_ISDIR(i) (((i) & 0170000) == 0040000)
# endif
#endif 

#ifndef S_ISREG
# ifdef S_IFREG
#  define S_ISREG(i) (((i) & S_IFMT) == S_IFREG)
# else
#  define S_ISREG(i) (((i) & 0170000) == 0100000)
# endif
#endif

int 		usage		(char *cmd);
void 		dir2file	(char *dirname);
void 		snip		(char *filename);
int 		checktype	(char *name);
void		createsrc	(FILE *in, FILE *out);
int 		makedir		(const char *dirname);
unsigned long	checkcrc	(FILE *fp);

extern char *optarg;

struct {
	int st_snipped;
	int st_directory;
} snipstat;


int 
main(int narg, char **arg)
{
	return ( (narg!=2) ? usage(arg[0]) : checktype(arg[1]) );
}	

int 
usage(char *cmd)
{
	printf(	"\nSNiPv2\n"
	       	"Usage: %s dir-or-file\n\n", cmd);

	return 0;
}	

int
checktype(char *name)
{
	struct stat chk;

	bzero(&snipstat, sizeof snipstat);

	if (stat(name, &chk)) {
		printf("Hmm %s doesn't exist\n", name);
		exit(0);
	}

	if (S_ISDIR(chk.st_mode))	dir2file(name);
	if (S_ISREG(chk.st_mode))	snip(name);

	printf("\n%d snipped file\n", 		snipstat.st_snipped);
	printf("%d directory created\n",	snipstat.st_directory);

	return 1;
}
			
void 
dir2file(char *dirname)
{
	DIR *dp;
	struct dirent *de;

	if (!(dp=opendir(dirname))) {
		perror("[dir2file] opendir");
		exit(0);
	}

	if (chdir(dirname) == -1) {
		perror("[dir2file] chdir1");
		exit(0);
	}

	
	while ((de=readdir(dp))) {

		printf("[%s]: ", de->d_name);
		
		switch(de->d_type) {
			case DT_FIFO:
			case DT_BLK:
			case DT_LNK:
			case DT_DIR:
			case DT_SOCK:	printf("skipping\n");
					continue;
		}

		putchar('\n');
		
		if (strstr(de->d_name, BFIART)) {
			snip(de->d_name);
		} else 
			printf("\tnot found\n");
	}
	
	closedir(dp);
}	

void 
snip(char *filename)
{
	FILE *in, *out;
	char buf[BUF_SIZE];
	static int passed = 0;

	if (!passed) {
		makedir(DIRNAME);
		passed = 1;
	}

	if (!(in=fopen(filename,"r"))) {
		perror("[snip] fopen()");
		exit(0);
	}

	chdir(DIRNAME);

	while (fgets(buf, BUF_SIZE, in)) {
		if (!strncmp(buf, BFISEP, BFISEP_LEN)) {
			char *ptr;

			buf[strlen(buf) - 1] = 0;

			/*
			 * create directories like in extract
			 */

			if ((ptr = strchr(buf + BFISEP_LEN, '/'))) {
				while(ptr) {
					*ptr = 0;
					
					if(makedir(buf + BFISEP_LEN) != -1) 
						snipstat.st_directory++;
					
					*ptr = '/';

					ptr = strchr(ptr + 1, '/');
					
				}
			}

			ptr = strchr(buf + BFISEP_LEN, ' ');

			/*
			 * create file
			 */

			*ptr = 0;
			if (!(out = fopen(buf + BFISEP_LEN, "wb+"))) {
				perror("[snip] fopen(outfile)\n");
				exit(0);
			}
			printf("\tfilename [%s] ", buf + BFISEP_LEN);
			createsrc(in, out);
			*ptr = ' ';

			/*
			 * check crc
			 */

			if ((ptr = strstr(ptr, "crc32: "))) {
				char *ptr_crc;
				u_long crc, gencrc;
				
				ptr += strlen("crc32: ");

				if ((ptr_crc = strchr(ptr, ' '))) {
					*ptr_crc = 0;

					crc	= strtoul(ptr, NULL, 10);
					gencrc	= checkcrc(out);
	
					if(crc == gencrc) 
						printf(" CRC32 ok");
					else
						printf(" CRC32 error: %lu", 
									gencrc);
					*ptr_crc = ' ';
				} else {
					printf("no end of crc in snip hdr\n");
					exit(0);
				}
					
			}

			putchar('\n');
			fclose(out);
		}
	}

	chdir("..");
			
					
	fclose(in);
}

void
createsrc(FILE *in, FILE *out)
{
	char buf[BUF_SIZE];

	snipstat.st_snipped++;
	
	while (fgets(buf, BUF_SIZE, in) && strncmp(buf, BFIEND, BFIEND_LEN)) 
		fprintf(out, "%s", buf);

}

int
makedir(const char *dirname) 
{
	return (mkdir(dirname, 0755));
}

static const u_int32_t crctab[256] = {
	0x00000000, 0x77073096, 0xee0e612c, 0x990951ba,
	0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3,
	0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988,
	0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91,
	0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de,
	0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7,
	0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec,
	0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5,
	0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172,
	0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b,
	0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940,
	0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59,
	0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116,
	0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f,
	0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924,
	0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d,
	0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a,
	0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433,
	0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818,
	0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01,
	0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e,
	0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457,
	0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c,
	0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65,
	0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2,
	0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb,
	0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0,
	0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9,
	0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086,
	0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f,
	0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4,
	0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad,
	0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a,
	0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683,
	0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8,
	0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1,
	0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe,
	0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7,
	0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc,
	0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5,
	0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252,
	0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b,
	0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60,
	0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79,
	0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236,
	0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f,
	0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04,
	0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d,
	0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a,
	0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713,
	0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38,
	0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21,
	0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e,
	0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777,
	0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c,
	0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45,
	0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2,
	0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db,
	0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0,
	0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9,
	0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6,
	0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf,
	0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94,
	0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d,
};

unsigned long 
checkcrc(FILE *fp)
{
	register unsigned long crc;
	int c;

    	crc = 0xFFFFFFFF;

        if (fseek(fp, 0, SEEK_SET) == -1) {
		perror("fseek");
		exit(0);
	}
	
    	while( (c = getc(fp)) != EOF )
        	crc = ((crc >> 8) & 0x00FFFFFF) ^ crctab[(crc ^ c) & 0xFF];
 
    	return (crc ^ 0xFFFFFFFF);
}