| 1 | #ifndef lint |
| 2 | static char sccsid[] = "@(#)utilities.c 3.15 (Berkeley) 83/08/11"; |
| 3 | #endif |
| 4 | |
| 5 | /* Copyright (c) 1983 Regents of the University of California */ |
| 6 | |
| 7 | #include "restore.h" |
| 8 | |
| 9 | char *copynext(); |
| 10 | |
| 11 | /* |
| 12 | * Insure that all the components of a pathname exist. |
| 13 | */ |
| 14 | pathcheck(name) |
| 15 | char *name; |
| 16 | { |
| 17 | register char *cp; |
| 18 | struct entry *ep; |
| 19 | char *start; |
| 20 | |
| 21 | start = index(name, '/'); |
| 22 | if (start == 0) |
| 23 | return; |
| 24 | for (cp = start; *cp != '\0'; cp++) { |
| 25 | if (*cp != '/') |
| 26 | continue; |
| 27 | *cp = '\0'; |
| 28 | ep = lookupname(name); |
| 29 | if (ep == NIL) { |
| 30 | ep = addentry(name, psearch(name), NODE); |
| 31 | newnode(ep); |
| 32 | ep->e_flags |= NEW|KEEP; |
| 33 | } |
| 34 | *cp = '/'; |
| 35 | } |
| 36 | } |
| 37 | |
| 38 | /* |
| 39 | * Change a name to a unique temporary name. |
| 40 | */ |
| 41 | mktempname(ep) |
| 42 | register struct entry *ep; |
| 43 | { |
| 44 | char oldname[MAXPATHLEN]; |
| 45 | |
| 46 | if (ep->e_flags & TMPNAME) |
| 47 | badentry(ep, "mktempname: called with TMPNAME"); |
| 48 | ep->e_flags |= TMPNAME; |
| 49 | (void) strcpy(oldname, myname(ep)); |
| 50 | freename(ep->e_name); |
| 51 | ep->e_name = savename(gentempname(ep)); |
| 52 | ep->e_namlen = strlen(ep->e_name); |
| 53 | renameit(oldname, myname(ep)); |
| 54 | } |
| 55 | |
| 56 | /* |
| 57 | * Generate a temporary name for an entry. |
| 58 | */ |
| 59 | char * |
| 60 | gentempname(ep) |
| 61 | struct entry *ep; |
| 62 | { |
| 63 | static char name[MAXPATHLEN]; |
| 64 | struct entry *np; |
| 65 | long i = 0; |
| 66 | |
| 67 | for (np = lookupino(ep->e_ino); np != NIL && np != ep; np = np->e_links) |
| 68 | i++; |
| 69 | if (np == NIL) |
| 70 | badentry(ep, "not on ino list"); |
| 71 | (void) sprintf(name, "%s%d%d", TMPHDR, i, ep->e_ino); |
| 72 | return (name); |
| 73 | } |
| 74 | |
| 75 | /* |
| 76 | * Rename a file or directory. |
| 77 | */ |
| 78 | renameit(from, to) |
| 79 | char *from, *to; |
| 80 | { |
| 81 | if (rename(from, to) < 0) { |
| 82 | fprintf(stderr, "Warning: cannot rename %s to %s", from, to); |
| 83 | (void) fflush(stderr); |
| 84 | perror(""); |
| 85 | return; |
| 86 | } |
| 87 | vprintf(stdout, "rename %s to %s\n", from, to); |
| 88 | } |
| 89 | |
| 90 | /* |
| 91 | * Create a new node (directory). |
| 92 | */ |
| 93 | newnode(np) |
| 94 | struct entry *np; |
| 95 | { |
| 96 | char *cp; |
| 97 | |
| 98 | if (np->e_type != NODE) |
| 99 | badentry(np, "newnode: not a node"); |
| 100 | cp = myname(np); |
| 101 | if (mkdir(cp, 0777) < 0) { |
| 102 | fprintf(stderr, "Warning: "); |
| 103 | (void) fflush(stderr); |
| 104 | perror(cp); |
| 105 | return; |
| 106 | } |
| 107 | vprintf(stdout, "Make node %s\n", cp); |
| 108 | } |
| 109 | |
| 110 | /* |
| 111 | * Remove an old node (directory). |
| 112 | */ |
| 113 | removenode(ep) |
| 114 | register struct entry *ep; |
| 115 | { |
| 116 | char *cp; |
| 117 | |
| 118 | if (ep->e_type != NODE) |
| 119 | badentry(ep, "removenode: not a node"); |
| 120 | if (ep->e_entries != NIL) |
| 121 | badentry(ep, "removenode: non-empty directory"); |
| 122 | ep->e_flags |= REMOVED; |
| 123 | ep->e_flags &= ~TMPNAME; |
| 124 | cp = myname(ep); |
| 125 | if (rmdir(cp) < 0) { |
| 126 | fprintf(stderr, "Warning: "); |
| 127 | (void) fflush(stderr); |
| 128 | perror(cp); |
| 129 | return; |
| 130 | } |
| 131 | vprintf(stdout, "Remove node %s\n", cp); |
| 132 | } |
| 133 | |
| 134 | /* |
| 135 | * Remove a leaf. |
| 136 | */ |
| 137 | removeleaf(ep) |
| 138 | register struct entry *ep; |
| 139 | { |
| 140 | char *cp; |
| 141 | |
| 142 | if (ep->e_type != LEAF) |
| 143 | badentry(ep, "removeleaf: not a leaf"); |
| 144 | ep->e_flags |= REMOVED; |
| 145 | ep->e_flags &= ~TMPNAME; |
| 146 | cp = myname(ep); |
| 147 | if (unlink(cp) < 0) { |
| 148 | fprintf(stderr, "Warning: "); |
| 149 | (void) fflush(stderr); |
| 150 | perror(cp); |
| 151 | return; |
| 152 | } |
| 153 | vprintf(stdout, "Remove leaf %s\n", cp); |
| 154 | } |
| 155 | |
| 156 | /* |
| 157 | * Create a link. |
| 158 | */ |
| 159 | linkit(existing, new, type) |
| 160 | char *existing, *new; |
| 161 | int type; |
| 162 | { |
| 163 | |
| 164 | if (type == SYMLINK) { |
| 165 | if (symlink(existing, new) < 0) { |
| 166 | fprintf(stderr, |
| 167 | "Warning: cannot create symbolic link %s->%s", |
| 168 | new, existing); |
| 169 | (void) fflush(stderr); |
| 170 | perror(""); |
| 171 | return; |
| 172 | } |
| 173 | } else if (type == HARDLINK) { |
| 174 | if (link(existing, new) < 0) { |
| 175 | fprintf(stderr, |
| 176 | "Warning: cannot create hard link %s->%s", |
| 177 | new, existing); |
| 178 | (void) fflush(stderr); |
| 179 | perror(""); |
| 180 | return; |
| 181 | } |
| 182 | } else { |
| 183 | panic("linkit: unknown type %d\n", type); |
| 184 | } |
| 185 | vprintf(stdout, "Create %s link %s->%s\n", |
| 186 | type == SYMLINK ? "symbolic" : "hard", new, existing); |
| 187 | } |
| 188 | |
| 189 | /* |
| 190 | * find lowest number file (above "start") that needs to be extracted |
| 191 | */ |
| 192 | ino_t |
| 193 | lowerbnd(start) |
| 194 | ino_t start; |
| 195 | { |
| 196 | register struct entry *ep; |
| 197 | |
| 198 | for ( ; start < maxino; start++) { |
| 199 | ep = lookupino(start); |
| 200 | if (ep == NIL || ep->e_type == NODE) |
| 201 | continue; |
| 202 | if (ep->e_flags & (NEW|EXTRACT)) |
| 203 | return (start); |
| 204 | } |
| 205 | return (start); |
| 206 | } |
| 207 | |
| 208 | /* |
| 209 | * find highest number file (below "start") that needs to be extracted |
| 210 | */ |
| 211 | ino_t |
| 212 | upperbnd(start) |
| 213 | ino_t start; |
| 214 | { |
| 215 | register struct entry *ep; |
| 216 | |
| 217 | for ( ; start > ROOTINO; start--) { |
| 218 | ep = lookupino(start); |
| 219 | if (ep == NIL || ep->e_type == NODE) |
| 220 | continue; |
| 221 | if (ep->e_flags & (NEW|EXTRACT)) |
| 222 | return (start); |
| 223 | } |
| 224 | return (start); |
| 225 | } |
| 226 | |
| 227 | /* |
| 228 | * report on a badly formed entry |
| 229 | */ |
| 230 | badentry(ep, msg) |
| 231 | register struct entry *ep; |
| 232 | char *msg; |
| 233 | { |
| 234 | |
| 235 | fprintf(stderr, "bad entry: %s\n", msg); |
| 236 | fprintf(stderr, "name: %s\n", myname(ep)); |
| 237 | fprintf(stderr, "parent name %s\n", myname(ep->e_parent)); |
| 238 | if (ep->e_sibling != NIL) |
| 239 | fprintf(stderr, "sibling name: %s\n", myname(ep->e_sibling)); |
| 240 | if (ep->e_entries != NIL) |
| 241 | fprintf(stderr, "next entry name: %s\n", myname(ep->e_entries)); |
| 242 | if (ep->e_links != NIL) |
| 243 | fprintf(stderr, "next link name: %s\n", myname(ep->e_links)); |
| 244 | if (ep->e_next != NIL) |
| 245 | fprintf(stderr, "next hashchain name: %s\n", myname(ep->e_next)); |
| 246 | fprintf(stderr, "entry type: %s\n", |
| 247 | ep->e_type == NODE ? "NODE" : "LEAF"); |
| 248 | fprintf(stderr, "inode number: %ld\n", ep->e_ino); |
| 249 | panic("flags: %s\n", flagvalues(ep)); |
| 250 | } |
| 251 | |
| 252 | /* |
| 253 | * Construct a string indicating the active flag bits of an entry. |
| 254 | */ |
| 255 | char * |
| 256 | flagvalues(ep) |
| 257 | register struct entry *ep; |
| 258 | { |
| 259 | static char flagbuf[BUFSIZ]; |
| 260 | |
| 261 | (void) strcpy(flagbuf, "|NIL"); |
| 262 | flagbuf[0] = '\0'; |
| 263 | if (ep->e_flags & REMOVED) |
| 264 | (void) strcat(flagbuf, "|REMOVED"); |
| 265 | if (ep->e_flags & TMPNAME) |
| 266 | (void) strcat(flagbuf, "|TMPNAME"); |
| 267 | if (ep->e_flags & EXTRACT) |
| 268 | (void) strcat(flagbuf, "|EXTRACT"); |
| 269 | if (ep->e_flags & NEW) |
| 270 | (void) strcat(flagbuf, "|NEW"); |
| 271 | if (ep->e_flags & KEEP) |
| 272 | (void) strcat(flagbuf, "|KEEP"); |
| 273 | return (&flagbuf[1]); |
| 274 | } |
| 275 | |
| 276 | /* |
| 277 | * Check to see if a name is on a dump tape. |
| 278 | */ |
| 279 | ino_t |
| 280 | dirlookup(name) |
| 281 | char *name; |
| 282 | { |
| 283 | ino_t ino; |
| 284 | |
| 285 | ino = psearch(name); |
| 286 | if (ino == 0 || BIT(ino, dumpmap) == 0) |
| 287 | fprintf(stderr, "%s is not on tape\n", name); |
| 288 | return (ino); |
| 289 | } |
| 290 | |
| 291 | /* |
| 292 | * Canonicalize file names to always start with ``./'' and |
| 293 | * remove any imbedded ".." components. |
| 294 | */ |
| 295 | canon(rawname, canonname) |
| 296 | char *rawname, *canonname; |
| 297 | { |
| 298 | register char *cp, *np; |
| 299 | int len; |
| 300 | |
| 301 | if (strcmp(rawname, ".") == 0 || strncmp(rawname, "./", 2) == 0) |
| 302 | (void) strcpy(canonname, ""); |
| 303 | else if (rawname[0] == '/') |
| 304 | (void) strcpy(canonname, "."); |
| 305 | else |
| 306 | (void) strcpy(canonname, "./"); |
| 307 | (void) strcat(canonname, rawname); |
| 308 | len = strlen(canonname) - 1; |
| 309 | if (canonname[len] == '/') |
| 310 | canonname[len] = '\0'; |
| 311 | /* |
| 312 | * Eliminate extraneous ".." from pathnames. |
| 313 | */ |
| 314 | for (np = canonname; *np != '\0'; ) { |
| 315 | np++; |
| 316 | cp = np; |
| 317 | while (*np != '/' && *np != '\0') |
| 318 | np++; |
| 319 | if (np - cp == 2 && strncmp(cp, "..", 2) == 0) { |
| 320 | cp--; |
| 321 | while (cp > &canonname[1] && *--cp != '/') |
| 322 | /* find beginning of name */; |
| 323 | (void) strcpy(cp, np); |
| 324 | np = cp; |
| 325 | } |
| 326 | } |
| 327 | } |
| 328 | |
| 329 | /* |
| 330 | * Elicit a reply. |
| 331 | */ |
| 332 | reply(question) |
| 333 | char *question; |
| 334 | { |
| 335 | char c; |
| 336 | |
| 337 | fprintf(stderr, "%s? ", question); |
| 338 | do { |
| 339 | fprintf(stderr, "[yn] "); |
| 340 | (void) fflush(stderr); |
| 341 | c = getc(terminal); |
| 342 | while (c != '\n' && getc(terminal) != '\n') |
| 343 | /* void */; |
| 344 | } while (c != 'y' && c != 'n'); |
| 345 | if (c == 'y') |
| 346 | return (GOOD); |
| 347 | return (FAIL); |
| 348 | } |
| 349 | |
| 350 | /* |
| 351 | * Read and parse an interactive command. |
| 352 | * The first word on the line is assigned to "cmd". If |
| 353 | * there are no arguments on the command line, then "curdir" |
| 354 | * is returned as the argument. If there are arguments |
| 355 | * on the line they are returned one at a time on each |
| 356 | * successive call to getcmd. Each argument is first assigned |
| 357 | * to "name". If it does not start with "/" the pathname in |
| 358 | * "curdir" is prepended to it. Finally "canon" is called to |
| 359 | * eliminate any embedded ".." components. |
| 360 | */ |
| 361 | getcmd(curdir, cmd, name) |
| 362 | char *curdir, *cmd, *name; |
| 363 | { |
| 364 | register char *cp; |
| 365 | static char *nextarg = NULL; |
| 366 | static char input[BUFSIZ]; |
| 367 | char output[BUFSIZ]; |
| 368 | # define rawname input /* save space by reusing input buffer */ |
| 369 | |
| 370 | /* |
| 371 | * Check to see if still processing arguments. |
| 372 | */ |
| 373 | if (nextarg != NULL) |
| 374 | goto getnext; |
| 375 | /* |
| 376 | * Read a command line and trim off trailing white space. |
| 377 | */ |
| 378 | do { |
| 379 | fprintf(stderr, "restore > "); |
| 380 | (void) fflush(stderr); |
| 381 | (void) fgets(input, BUFSIZ, terminal); |
| 382 | } while (!feof(terminal) && input[0] == '\n'); |
| 383 | if (feof(terminal)) { |
| 384 | (void) strcpy(cmd, "quit"); |
| 385 | return; |
| 386 | } |
| 387 | for (cp = &input[strlen(input) - 2]; *cp == ' ' || *cp == '\t'; cp--) |
| 388 | /* trim off trailing white space and newline */; |
| 389 | *++cp = '\0'; |
| 390 | /* |
| 391 | * Copy the command into "cmd". |
| 392 | */ |
| 393 | cp = copynext(input, cmd); |
| 394 | /* |
| 395 | * If no argument, use curdir as the default. |
| 396 | */ |
| 397 | if (*cp == '\0') { |
| 398 | (void) strcpy(name, curdir); |
| 399 | return; |
| 400 | } |
| 401 | nextarg = cp; |
| 402 | /* |
| 403 | * Find the next argument. |
| 404 | */ |
| 405 | getnext: |
| 406 | cp = copynext(nextarg, rawname); |
| 407 | if (*cp == '\0') |
| 408 | nextarg = NULL; |
| 409 | else |
| 410 | nextarg = cp; |
| 411 | /* |
| 412 | * If it an absolute pathname, canonicalize it and return it. |
| 413 | */ |
| 414 | if (rawname[0] == '/') { |
| 415 | canon(rawname, name); |
| 416 | return; |
| 417 | } |
| 418 | /* |
| 419 | * For relative pathnames, prepend the current directory to |
| 420 | * it then canonicalize and return it. |
| 421 | */ |
| 422 | (void) strcpy(output, curdir); |
| 423 | (void) strcat(output, "/"); |
| 424 | (void) strcat(output, rawname); |
| 425 | canon(output, name); |
| 426 | # undef rawname |
| 427 | } |
| 428 | |
| 429 | /* |
| 430 | * Strip off the next token of the input. |
| 431 | */ |
| 432 | char * |
| 433 | copynext(input, output) |
| 434 | char *input, *output; |
| 435 | { |
| 436 | register char *cp, *bp; |
| 437 | char quote; |
| 438 | |
| 439 | for (cp = input; *cp == ' ' || *cp == '\t'; cp++) |
| 440 | /* skip to argument */; |
| 441 | bp = output; |
| 442 | while (*cp != ' ' && *cp != '\t' && *cp != '\0') { |
| 443 | /* |
| 444 | * Handle back slashes. |
| 445 | */ |
| 446 | if (*cp == '\\') { |
| 447 | if (*++cp == '\0') { |
| 448 | fprintf(stderr, |
| 449 | "command lines cannot be continued\n"); |
| 450 | continue; |
| 451 | } |
| 452 | *bp++ = *cp++; |
| 453 | continue; |
| 454 | } |
| 455 | /* |
| 456 | * The usual unquoted case. |
| 457 | */ |
| 458 | if (*cp != '\'' && *cp != '"') { |
| 459 | *bp++ = *cp++; |
| 460 | continue; |
| 461 | } |
| 462 | /* |
| 463 | * Handle single and double quotes. |
| 464 | */ |
| 465 | quote = *cp++; |
| 466 | while (*cp != quote && *cp != '\0') |
| 467 | *bp++ = *cp++; |
| 468 | if (*cp++ == '\0') { |
| 469 | fprintf(stderr, "missing %c\n", quote); |
| 470 | cp--; |
| 471 | continue; |
| 472 | } |
| 473 | } |
| 474 | *bp = '\0'; |
| 475 | return (cp); |
| 476 | } |
| 477 | |
| 478 | /* |
| 479 | * respond to interrupts |
| 480 | */ |
| 481 | onintr() |
| 482 | { |
| 483 | if (reply("restore interrupted, continue") == FAIL) |
| 484 | done(1); |
| 485 | if (signal(SIGINT, onintr) == SIG_IGN) |
| 486 | (void) signal(SIGINT, SIG_IGN); |
| 487 | if (signal(SIGTERM, onintr) == SIG_IGN) |
| 488 | (void) signal(SIGTERM, SIG_IGN); |
| 489 | } |
| 490 | |
| 491 | /* |
| 492 | * handle unexpected inconsistencies |
| 493 | */ |
| 494 | /* VARARGS1 */ |
| 495 | panic(msg, d1, d2) |
| 496 | char *msg; |
| 497 | long d1, d2; |
| 498 | { |
| 499 | |
| 500 | fprintf(stderr, msg, d1, d2); |
| 501 | if (reply("abort") == GOOD) { |
| 502 | if (reply("dump core") == GOOD) |
| 503 | abort(); |
| 504 | done(1); |
| 505 | } |
| 506 | } |