/* * Copyright (c) 2004 Motd Laboratories. All rights reserved. * * For more information, please visit http://www.motdlabs.org * * -- * * Steganography with HTML * * Usage: ./steno -[hs] [steno file] * -h hide data file in html file * -s show hidden data * * * Ex.: * wget http://narcotic.motdlabs.org/index.html * ./steno -s index.html steno.txt * cat steno.txt * -- * * Narcotic * narcotic@motdlabs.org */ #include #include #include #include #ifndef false #define false 0 #define true !false #endif int msgSize; /* * alphabet: white space (0x20) bit off * tab (0x13) bit on * new line (0x0A) new byte */ char *show(unsigned char *buff,unsigned int *nsize) { char *ret, *tmp = (char *)malloc(*nsize >> 3); int pos, count; char byte, ignore; byte = pos = count = 0; ignore = false; while(*buff++) { switch(*buff) { case '\t': byte |= 1 << count++; break; case ' ': count++; break; case '\n': count = 0; byte = 0; break; /*

? */ case '<': if(strncmp(buff,"

",5) == 0)
                                       ignore = true;
                                   else if(ignore && strncmp(buff,"

",6) == 0) ignore = false; break; } if(count == 8 && !ignore) { tmp[pos++] = byte; count = 0; byte = 0; } } ret = (char *)malloc(pos); memcpy(ret,tmp,pos); free(tmp); *nsize = pos; return ret; } char *hide(unsigned char *buff, unsigned char *info, unsigned int nsize) { char *tmp = (char *)malloc((nsize << 3) + strlen(buff) + 1); char *ret; char ignore, nl = '\n'; unsigned int count, pos, i, j; count = pos = 0; while(*buff) { if(nsize) { switch(*buff) { case '\t': case ' ': if((*info >> count) & 1) tmp[pos++] = '\t'; else tmp[pos++] = ' '; count++; break; case '\r': nl = '\r'; case '\n': if(count && count < 8) { for(i = count; i < 8; i++) { if((*info >> i) & 1) tmp[pos++] = '\t'; else tmp[pos++] = ' '; } info++; nsize--; } tmp[pos++] = nl; count = 0; nl = '\n'; break; case '<': if(strncmp(buff,"

",5) == 0)
                                                ignore = true;
                                          else if(ignore && strncmp(buff,"

",6) == 0) ignore = false; default: tmp[pos++] = *buff; } if(count == 8) { count = 0; info++; nsize--; } } else { switch(*buff) { case ' ': case '\t': count++; break; case '\r': case '\n': count = 0; break; case '<': if(strncmp(buff,"

",5) == 0)
                                                ignore = true;
                                          else if(ignore && strncmp(buff,"

",6) == 0) ignore = false; break; } if(!ignore && count == 7) { tmp[pos++] = '\n'; count = 0; } tmp[pos++] = *buff; } buff++; } if(nsize) { for(i = 0; i < nsize; i++) { for(j = 0; j < 8; j++) { if((*info >> j) & 1) tmp[pos++] = '\t'; else tmp[pos++] = ' '; } info++; } } ret = (char *)malloc(pos); memcpy(ret,tmp,pos); free(tmp); return ret; } int readfile(char *fname, char **data) { FILE *fp; int fsize, n; fp = fopen(fname,"rb"); if(!fp) return -1; fseek(fp,0L,SEEK_END); fsize = ftell(fp); rewind(fp); *data = (char *)malloc(fsize); if(*data == NULL) return -2; n = fread (*data, fsize, 1, fp); fclose(fp); if(n == -1) return -3; return fsize; } int save(char *fname,char *data,int len) { FILE *fp; fp = fopen(fname,"wb"); if(!fp) return -1; fwrite(data,len,1,fp); fclose(fp); return 0; } void CopyRight() { printf("Steganography HTML ver 0.1\n"); printf("Copyright (c) 2004 Motd Laboratories. All rights reserved.\n"); } void Usage() { printf("./steno -[hs] [steno file]\n"); printf("-h hide data file in html file\n"); printf("-s show hidden data\n\n"); } int main(int argc, char **argv) { char *info, *datafile, *fname; char *steno; int len, len2; CopyRight(); if(argc != 4 && argc != 5) { Usage(); return 1; } else if(argc == 4) fname = argv[3]; else fname = argv[4]; if(argv[1][0] == '-') { switch(argv[1][1]) { /* hide information */ case 'h': len = readfile(argv[2],&datafile); len2 = readfile(argv[3],&info); steno = hide(datafile,info,len2); save(fname,steno,strlen(steno)); break; /* show information */ case 's': len = readfile(argv[2],&datafile); len2 = len; steno = show(datafile,&len2); save(fname,steno,len2); break; default: Usage(); break; } } else { Usage(); } return 0; }