1 2 #include <stdio.h> 3 #include <stdlib.h> 4 #include <unistd.h> 5 #include <string.h> 6 #include <ctype.h> 7 8 #include <sys/types.h> 9 #include <sys/stat.h> 10 #include <dirent.h> 11 12 #include <stdarg.h> 13 #include <fcntl.h> 14 15 #include <private/android_filesystem_config.h> 16 17 /* NOTES 18 ** 19 ** - see buffer-format.txt from the linux kernel docs for 20 ** an explanation of this file format 21 ** - dotfiles are ignored 22 ** - directories named 'root' are ignored 23 ** - device notes, pipes, etc are not supported (error) 24 */ 25 26 void die(const char *why, ...) 27 { 28 va_list ap; 29 30 va_start(ap, why); 31 fprintf(stderr,"error: "); 32 vfprintf(stderr, why, ap); 33 fprintf(stderr,"\n"); 34 va_end(ap); 35 exit(1); 36 } 37 38 struct fs_config_entry { 39 char* name; 40 int uid, gid, mode; 41 }; 42 43 static struct fs_config_entry* canned_config = NULL; 44 45 /* Each line in the canned file should be a path plus three ints (uid, 46 * gid, mode). */ 47 #ifdef PATH_MAX 48 #define CANNED_LINE_LENGTH (PATH_MAX+100) 49 #else 50 #define CANNED_LINE_LENGTH (1024) 51 #endif 52 53 static int verbose = 0; 54 static int total_size = 0; 55 56 static void fix_stat(const char *path, struct stat *s) 57 { 58 uint64_t capabilities; 59 if (canned_config) { 60 // Use the list of file uid/gid/modes loaded from the file 61 // given with -f. 62 63 struct fs_config_entry* empty_path_config = NULL; 64 struct fs_config_entry* p; 65 for (p = canned_config; p->name; ++p) { 66 if (!p->name[0]) { 67 empty_path_config = p; 68 } 69 if (strcmp(p->name, path) == 0) { 70 s->st_uid = p->uid; 71 s->st_gid = p->gid; 72 s->st_mode = p->mode | (s->st_mode & ~07777); 73 return; 74 } 75 } 76 s->st_uid = empty_path_config->uid; 77 s->st_gid = empty_path_config->gid; 78 s->st_mode = empty_path_config->mode | (s->st_mode & ~07777); 79 } else { 80 // Use the compiled-in fs_config() function. 81 82 fs_config(path, S_ISDIR(s->st_mode), &s->st_uid, &s->st_gid, &s->st_mode, &capabilities); 83 } 84 } 85 86 static void _eject(struct stat *s, char *out, int olen, char *data, unsigned datasize) 87 { 88 // Nothing is special about this value, just picked something in the 89 // approximate range that was being used already, and avoiding small 90 // values which may be special. 91 static unsigned next_inode = 300000; 92 93 while(total_size & 3) { 94 total_size++; 95 putchar(0); 96 } 97 98 fix_stat(out, s); 99 // fprintf(stderr, "_eject %s: mode=0%o\n", out, s->st_mode); 100 101 printf("%06x%08x%08x%08x%08x%08x%08x" 102 "%08x%08x%08x%08x%08x%08x%08x%s%c", 103 0x070701, 104 next_inode++, // s.st_ino, 105 s->st_mode, 106 0, // s.st_uid, 107 0, // s.st_gid, 108 1, // s.st_nlink, 109 0, // s.st_mtime, 110 datasize, 111 0, // volmajor 112 0, // volminor 113 0, // devmajor 114 0, // devminor, 115 olen + 1, 116 0, 117 out, 118 0 119 ); 120 121 total_size += 6 + 8*13 + olen + 1; 122 123 if(strlen(out) != (unsigned int)olen) die("ACK!"); 124 125 while(total_size & 3) { 126 total_size++; 127 putchar(0); 128 } 129 130 if(datasize) { 131 fwrite(data, datasize, 1, stdout); 132 total_size += datasize; 133 } 134 } 135 136 static void _eject_trailer() 137 { 138 struct stat s; 139 memset(&s, 0, sizeof(s)); 140 _eject(&s, "TRAILER!!!", 10, 0, 0); 141 142 while(total_size & 0xff) { 143 total_size++; 144 putchar(0); 145 } 146 } 147 148 static void _archive(char *in, char *out, int ilen, int olen); 149 150 static int compare(const void* a, const void* b) { 151 return strcmp(*(const char**)a, *(const char**)b); 152 } 153 154 static void _archive_dir(char *in, char *out, int ilen, int olen) 155 { 156 int i, t; 157 DIR *d; 158 struct dirent *de; 159 160 if(verbose) { 161 fprintf(stderr,"_archive_dir('%s','%s',%d,%d)\n", 162 in, out, ilen, olen); 163 } 164 165 d = opendir(in); 166 if(d == 0) die("cannot open directory '%s'", in); 167 168 int size = 32; 169 int entries = 0; 170 char** names = malloc(size * sizeof(char*)); 171 if (names == NULL) { 172 fprintf(stderr, "failed to allocate dir names array (size %d)\n", size); 173 exit(1); 174 } 175 176 while((de = readdir(d)) != 0){ 177 /* xxx: feature? maybe some dotfiles are okay */ 178 if(de->d_name[0] == '.') continue; 179 180 /* xxx: hack. use a real exclude list */ 181 if(!strcmp(de->d_name, "root")) continue; 182 183 if (entries >= size) { 184 size *= 2; 185 names = realloc(names, size * sizeof(char*)); 186 if (names == NULL) { 187 fprintf(stderr, "failed to reallocate dir names array (size %d)\n", 188 size); 189 exit(1); 190 } 191 } 192 names[entries] = strdup(de->d_name); 193 if (names[entries] == NULL) { 194 fprintf(stderr, "failed to strdup name \"%s\"\n", 195 de->d_name); 196 exit(1); 197 } 198 ++entries; 199 } 200 201 qsort(names, entries, sizeof(char*), compare); 202 203 for (i = 0; i < entries; ++i) { 204 t = strlen(names[i]); 205 in[ilen] = '/'; 206 memcpy(in + ilen + 1, names[i], t + 1); 207 208 if(olen > 0) { 209 out[olen] = '/'; 210 memcpy(out + olen + 1, names[i], t + 1); 211 _archive(in, out, ilen + t + 1, olen + t + 1); 212 } else { 213 memcpy(out, names[i], t + 1); 214 _archive(in, out, ilen + t + 1, t); 215 } 216 217 in[ilen] = 0; 218 out[olen] = 0; 219 220 free(names[i]); 221 } 222 free(names); 223 } 224 225 static void _archive(char *in, char *out, int ilen, int olen) 226 { 227 struct stat s; 228 229 if(verbose) { 230 fprintf(stderr,"_archive('%s','%s',%d,%d)\n", 231 in, out, ilen, olen); 232 } 233 234 if(lstat(in, &s)) die("could not stat '%s'\n", in); 235 236 if(S_ISREG(s.st_mode)){ 237 char *tmp; 238 int fd; 239 240 fd = open(in, O_RDONLY); 241 if(fd < 0) die("cannot open '%s' for read", in); 242 243 tmp = (char*) malloc(s.st_size); 244 if(tmp == 0) die("cannot allocate %d bytes", s.st_size); 245 246 if(read(fd, tmp, s.st_size) != s.st_size) { 247 die("cannot read %d bytes", s.st_size); 248 } 249 250 _eject(&s, out, olen, tmp, s.st_size); 251 252 free(tmp); 253 close(fd); 254 } else if(S_ISDIR(s.st_mode)) { 255 _eject(&s, out, olen, 0, 0); 256 _archive_dir(in, out, ilen, olen); 257 } else if(S_ISLNK(s.st_mode)) { 258 char buf[1024]; 259 int size; 260 size = readlink(in, buf, 1024); 261 if(size < 0) die("cannot read symlink '%s'", in); 262 _eject(&s, out, olen, buf, size); 263 } else { 264 die("Unknown '%s' (mode %d)?\n", in, s.st_mode); 265 } 266 } 267 268 void archive(const char *start, const char *prefix) 269 { 270 char in[8192]; 271 char out[8192]; 272 273 strcpy(in, start); 274 strcpy(out, prefix); 275 276 _archive_dir(in, out, strlen(in), strlen(out)); 277 } 278 279 static void read_canned_config(char* filename) 280 { 281 int allocated = 8; 282 int used = 0; 283 284 canned_config = 285 (struct fs_config_entry*)malloc(allocated * sizeof(struct fs_config_entry)); 286 287 char line[CANNED_LINE_LENGTH]; 288 FILE* f = fopen(filename, "r"); 289 if (f == NULL) die("failed to open canned file"); 290 291 while (fgets(line, CANNED_LINE_LENGTH, f) != NULL) { 292 if (!line[0]) break; 293 if (used >= allocated) { 294 allocated *= 2; 295 canned_config = (struct fs_config_entry*)realloc( 296 canned_config, allocated * sizeof(struct fs_config_entry)); 297 } 298 299 struct fs_config_entry* cc = canned_config + used; 300 301 if (isspace(line[0])) { 302 cc->name = strdup(""); 303 cc->uid = atoi(strtok(line, " \n")); 304 } else { 305 cc->name = strdup(strtok(line, " \n")); 306 cc->uid = atoi(strtok(NULL, " \n")); 307 } 308 cc->gid = atoi(strtok(NULL, " \n")); 309 cc->mode = strtol(strtok(NULL, " \n"), NULL, 8); 310 ++used; 311 } 312 if (used >= allocated) { 313 ++allocated; 314 canned_config = (struct fs_config_entry*)realloc( 315 canned_config, allocated * sizeof(struct fs_config_entry)); 316 } 317 canned_config[used].name = NULL; 318 319 fclose(f); 320 } 321 322 323 int main(int argc, char *argv[]) 324 { 325 argc--; 326 argv++; 327 328 if (argc > 1 && strcmp(argv[0], "-f") == 0) { 329 read_canned_config(argv[1]); 330 argc -= 2; 331 argv += 2; 332 } 333 334 if(argc == 0) die("no directories to process?!"); 335 336 while(argc-- > 0){ 337 char *x = strchr(*argv, '='); 338 if(x != 0) { 339 *x++ = 0; 340 } else { 341 x = ""; 342 } 343 344 archive(*argv, x); 345 346 argv++; 347 } 348 349 _eject_trailer(); 350 351 return 0; 352 } 353
