/*
 * ~[ fm-dmpsc.c ]  
 *
 * Dump the opcodes from a file, starting from an offset provided.
 *
 * written by -( nemo @ felinemenace.org )-
 *
 *                    _,'|             _.-''``-...___..--';)
 *                    /_ \'.      __..-' ,      ,--...--'''
 *                   <\    .`--'''       `     /'
 *                   `-';'               ;   ; ;
 *              __...--''     ___...--_..'  .;.'
 *          fL (,__....----'''       (,..--''  
 *		 -( http://www.felinemenace.org )-
 *
 */

#include <stdio.h>
#include <errno.h>

#define MAXSC	10000

void usage(char *file)
{
	printf("usage: %s <file> <offset1> [<offset2>]\n",file);
	exit(1);
}

int main(int ac, char **av)
{
	char shellcode[MAXSC] = "char shellcode[] = {\n\"";
	unsigned int curr,offset1,offset2 = 0xffffffff;
	FILE *fp;
	char *ptr = shellcode + strlen(shellcode) - 1;
	unsigned char hex;
	int cnt = 0;

	if(ac < 3 || ac > 4)
		usage(*av);
	sscanf(av[2],"%p",&offset1);
	if(av[3])
		sscanf(av[3],"%p",&offset2);
	if(offset2 <= offset1) 
		usage(*av);
	if(!(fp = fopen(av[1],"r+"))) {
		printf("Error opening file.\n");
		exit(1);
	}
	if(fseek(fp,offset1,SEEK_SET) == -1){
		printf("Error seeking to offset1.\n");
		exit(1);
	}
	do {
		if((offset1 + cnt) >= offset2) {
			break;
		}
		if(cnt && !(cnt % 16))  {
			strcat(ptr,"\"\n\"");
			ptr+=3;
		}
		strcat(ptr,"\\x");
		if(!(fread(&hex, 1,1,fp) ==1)) {
			if(errno) {
				printf("An error has occured reading from the file.\n");
				exit(1);
			}	
			break;
		}
		ptr+=3;
		sprintf(ptr,"%02x",hex);	
		cnt++;
	} while(ptr++ < (shellcode + MAXSC - 4)) ;
	strcat(ptr,"\"\n};\n");	
	printf("// shellcode generated by -( nemo@felinemenace.org )-\n");
	printf("%s\n",shellcode);

	return 0;
}