| 1 | /* -*-c-*- |
| 2 | * |
| 3 | * Fake rmt(8) server for hashing and storing files |
| 4 | * |
| 5 | * (c) 2010 Mark Wooding |
| 6 | */ |
| 7 | |
| 8 | /*----- Licensing notice --------------------------------------------------* |
| 9 | * |
| 10 | * This program is free software; you can redistribute it and/or modify |
| 11 | * it under the terms of the GNU General Public License as published by |
| 12 | * the Free Software Foundation; either version 2 of the License, or |
| 13 | * (at your option) any later version. |
| 14 | * |
| 15 | * This program is distributed in the hope that it will be useful, |
| 16 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 17 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 18 | * GNU General Public License for more details. |
| 19 | * |
| 20 | * You should have received a copy of the GNU General Public License |
| 21 | * along with this program; if not, write to the Free Software Foundation, |
| 22 | * Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. |
| 23 | */ |
| 24 | |
| 25 | /*----- Header files ------------------------------------------------------*/ |
| 26 | |
| 27 | #define _FILE_OFFSET_BITS 64 |
| 28 | |
| 29 | #include <ctype.h> |
| 30 | #include <errno.h> |
| 31 | #include <limits.h> |
| 32 | #include <signal.h> |
| 33 | #include <stdio.h> |
| 34 | #include <stdlib.h> |
| 35 | #include <string.h> |
| 36 | |
| 37 | #include <sys/types.h> |
| 38 | #include <unistd.h> |
| 39 | #include <fcntl.h> |
| 40 | |
| 41 | #include <getopt.h> |
| 42 | |
| 43 | #include <pwd.h> |
| 44 | |
| 45 | #include <mLib/dstr.h> |
| 46 | #include <mLib/quis.h> |
| 47 | #include <mLib/report.h> |
| 48 | |
| 49 | #include <nettle/sha.h> |
| 50 | |
| 51 | /*----- Configuration -----------------------------------------------------*/ |
| 52 | |
| 53 | #ifndef BKP |
| 54 | # define BKP "/mnt/bkp" |
| 55 | #endif |
| 56 | |
| 57 | /*----- Main code ---------------------------------------------------------*/ |
| 58 | |
| 59 | #define BUFSZ 10240 |
| 60 | #define LSEEK_GET_TAPEPOS 10 |
| 61 | #define LSEEK_GO2_TAPEPOS 11 |
| 62 | |
| 63 | struct flag { |
| 64 | const char *name; |
| 65 | int f; |
| 66 | }; |
| 67 | |
| 68 | static const struct flag openflag[] = { |
| 69 | /* ;;; Emacs Lisp to generate the table below. Place your cursor just |
| 70 | ;;; after the closing `)' and press C-x C-e. |
| 71 | |
| 72 | (let ((flags '(rdonly wronly rdwr creat excl trunc nonblock ndelay |
| 73 | noctty append dsync rsync sync cloexec async |
| 74 | direct noatime nofollow shlock exlock defer))) |
| 75 | (save-excursion |
| 76 | (goto-char (point-min)) |
| 77 | (search-forward (concat "***" "BEGIN openflag" "***")) |
| 78 | (beginning-of-line 2) |
| 79 | (delete-region (point) |
| 80 | (progn |
| 81 | (search-forward "***END***") |
| 82 | (beginning-of-line) |
| 83 | (point))) |
| 84 | (dolist (f (sort (copy-list flags) #'string<)) |
| 85 | (let ((up (upcase (symbol-name f)))) |
| 86 | (insert (format "#ifdef O_%s\n" up)) |
| 87 | (insert (format " { \"%s\", O_%s },\n" up up)) |
| 88 | (insert "#endif\n"))))) |
| 89 | */ |
| 90 | /***BEGIN openflag***/ |
| 91 | #ifdef O_APPEND |
| 92 | { "APPEND", O_APPEND }, |
| 93 | #endif |
| 94 | #ifdef O_ASYNC |
| 95 | { "ASYNC", O_ASYNC }, |
| 96 | #endif |
| 97 | #ifdef O_CLOEXEC |
| 98 | { "CLOEXEC", O_CLOEXEC }, |
| 99 | #endif |
| 100 | #ifdef O_CREAT |
| 101 | { "CREAT", O_CREAT }, |
| 102 | #endif |
| 103 | #ifdef O_DEFER |
| 104 | { "DEFER", O_DEFER }, |
| 105 | #endif |
| 106 | #ifdef O_DIRECT |
| 107 | { "DIRECT", O_DIRECT }, |
| 108 | #endif |
| 109 | #ifdef O_DSYNC |
| 110 | { "DSYNC", O_DSYNC }, |
| 111 | #endif |
| 112 | #ifdef O_EXCL |
| 113 | { "EXCL", O_EXCL }, |
| 114 | #endif |
| 115 | #ifdef O_EXLOCK |
| 116 | { "EXLOCK", O_EXLOCK }, |
| 117 | #endif |
| 118 | #ifdef O_NDELAY |
| 119 | { "NDELAY", O_NDELAY }, |
| 120 | #endif |
| 121 | #ifdef O_NOATIME |
| 122 | { "NOATIME", O_NOATIME }, |
| 123 | #endif |
| 124 | #ifdef O_NOCTTY |
| 125 | { "NOCTTY", O_NOCTTY }, |
| 126 | #endif |
| 127 | #ifdef O_NOFOLLOW |
| 128 | { "NOFOLLOW", O_NOFOLLOW }, |
| 129 | #endif |
| 130 | #ifdef O_NONBLOCK |
| 131 | { "NONBLOCK", O_NONBLOCK }, |
| 132 | #endif |
| 133 | #ifdef O_RDONLY |
| 134 | { "RDONLY", O_RDONLY }, |
| 135 | #endif |
| 136 | #ifdef O_RDWR |
| 137 | { "RDWR", O_RDWR }, |
| 138 | #endif |
| 139 | #ifdef O_RSYNC |
| 140 | { "RSYNC", O_RSYNC }, |
| 141 | #endif |
| 142 | #ifdef O_SHLOCK |
| 143 | { "SHLOCK", O_SHLOCK }, |
| 144 | #endif |
| 145 | #ifdef O_SYNC |
| 146 | { "SYNC", O_SYNC }, |
| 147 | #endif |
| 148 | #ifdef O_TRUNC |
| 149 | { "TRUNC", O_TRUNC }, |
| 150 | #endif |
| 151 | #ifdef O_WRONLY |
| 152 | { "WRONLY", O_WRONLY }, |
| 153 | #endif |
| 154 | /***END***/ |
| 155 | { 0, 0 } |
| 156 | }; |
| 157 | |
| 158 | int main(int argc, char *argv[]) |
| 159 | { |
| 160 | int ch; |
| 161 | dstr d = DSTR_INIT, dd = DSTR_INIT; |
| 162 | unsigned char buf[BUFSZ]; |
| 163 | int fd = -1, hfd = -1; |
| 164 | off_t rc; |
| 165 | off_t off = 0; |
| 166 | struct passwd *pw; |
| 167 | uid_t u; |
| 168 | unsigned f = 0; |
| 169 | #define f_bogus 1u |
| 170 | const char *p = 0; |
| 171 | const char *bkp = 0, *host = 0; |
| 172 | struct sha256_ctx hc; |
| 173 | |
| 174 | ego(argv[0]); |
| 175 | setvbuf(stdin, 0, _IONBF, 0); |
| 176 | signal(SIGPIPE, SIG_IGN); |
| 177 | |
| 178 | for (;;) { |
| 179 | int o = getopt(argc, argv, "H:r:"); |
| 180 | if (o < 0) break; |
| 181 | switch (o) { |
| 182 | case 'H': host = optarg; break; |
| 183 | case 'r': bkp = optarg; break; |
| 184 | default: f |= f_bogus; break; |
| 185 | } |
| 186 | } |
| 187 | argc -= optind; argv += optind; |
| 188 | if ((f & f_bogus) || argc) { |
| 189 | pquis(stderr, "usage: $ [-r ROOT] [-H HOST]\n"); |
| 190 | exit(1); |
| 191 | } |
| 192 | |
| 193 | if (!bkp) bkp = getenv("BKP"); |
| 194 | if (!bkp) bkp = BKP; |
| 195 | |
| 196 | if (!host) host = getenv("BKP_HOST"); |
| 197 | |
| 198 | if (!host) { |
| 199 | p = getenv("USER"); |
| 200 | if (!p) p = getenv("LOGNAME"); |
| 201 | if (!p) { |
| 202 | u = getuid(); |
| 203 | if ((pw = getpwuid(u)) == 0) |
| 204 | die(1, "no passwd entry (you don't exist?)"); |
| 205 | p = pw->pw_name; |
| 206 | } |
| 207 | if (strncmp(p, "bkp-", 4) != 0) { |
| 208 | die(1, "can't deduce host name: " |
| 209 | "login name `%s' doesn't begin with `bkp-'", |
| 210 | p); |
| 211 | } |
| 212 | host = p + 4; |
| 213 | } |
| 214 | |
| 215 | for (;;) { |
| 216 | if (fflush(stdout)) goto fail; |
| 217 | ch = getchar(); |
| 218 | if (ch == EOF) break; |
| 219 | DRESET(&d); DRESET(&dd); rc = 0; |
| 220 | |
| 221 | #define CHECKFD do { if (fd < 0) goto badf; } while (0) |
| 222 | #define ERROR(what) do moan(what ": %s", strerror(errno)); while (0) |
| 223 | #define ERROR1(what, arg) \ |
| 224 | do moan(what ": %s", arg, strerror(errno)); while (0) |
| 225 | #define ARG(d) do { \ |
| 226 | if (dstr_putline(&d, stdin) == EOF || ferror(stdin) || feof(stdin)) \ |
| 227 | { moan("read (stdin)", strerror(errno)); goto fail; } \ |
| 228 | } while (0) |
| 229 | |
| 230 | #define SKIPWS do { while (isspace((unsigned char)*p)) p++; } while (0) |
| 231 | |
| 232 | switch (ch) { |
| 233 | |
| 234 | case 'O': { |
| 235 | /* Ofile\nmode\n -- open file */ |
| 236 | |
| 237 | const struct flag *ff; |
| 238 | char *p, *q; |
| 239 | size_t n; |
| 240 | long mode, f; |
| 241 | |
| 242 | ARG(d); ARG(dd); |
| 243 | if (fd >= 0 && close(fd)) ERROR("close (fd)"); |
| 244 | if (hfd >= 0 && close(hfd)) ERROR("close (hash)"); |
| 245 | fd = hfd = -1; |
| 246 | |
| 247 | if (chdir(bkp) || chdir(host)) ERROR1("chdir (%s)", host); |
| 248 | p = d.buf; |
| 249 | if ((q = strchr(p, '/')) == 0) |
| 250 | { moan("bad path: missing `/')"); goto inval; } |
| 251 | *q++ = 0; |
| 252 | if (chdir(p) || chdir("prepare/incoming")) ERROR1("chdir (%s)", p); |
| 253 | |
| 254 | memmove(d.buf, q, d.len - (q - d.buf) + 1); |
| 255 | d.len -= q - d.buf; |
| 256 | |
| 257 | errno = 0; |
| 258 | mode = strtol(dd.buf, &p, 0); |
| 259 | if (errno) ERROR("bad mode"); |
| 260 | else if (mode < 0 || mode > INT_MAX) |
| 261 | { moan("bad mode: range"); goto range; } |
| 262 | SKIPWS; |
| 263 | if (!*p) { |
| 264 | switch (mode & O_ACCMODE) { |
| 265 | case O_RDONLY: mode = O_RDONLY; break; |
| 266 | case O_WRONLY: mode = O_WRONLY | O_TRUNC | O_CREAT; break; |
| 267 | case O_RDWR: mode = O_RDWR; |
| 268 | default: moan("bad mode: unknown access type"); goto inval; |
| 269 | } |
| 270 | } else { |
| 271 | mode = 0; |
| 272 | for (;;) { |
| 273 | if (p[0] == 'O' && p[1] == '_') { |
| 274 | p += 2; |
| 275 | n = strcspn(p, " \t|"); |
| 276 | for (ff = openflag; ff->name; ff++) { |
| 277 | if (strncmp(p, ff->name, n) == 0 && !ff->name[n]) |
| 278 | goto ofmatch; |
| 279 | } |
| 280 | moan("bad mode: unknown flag O_%.*s", (int)n, p); |
| 281 | goto inval; |
| 282 | ofmatch: |
| 283 | mode |= ff->f; |
| 284 | p += n; |
| 285 | } else if (isdigit((unsigned long)*p)) { |
| 286 | errno = 0; |
| 287 | f = strtol(p, &p, 0); |
| 288 | if (errno) ERROR("bad mode"); |
| 289 | else if (f < 0 || f > INT_MAX) |
| 290 | { moan("bad mode: range"); goto range; } |
| 291 | mode |= f; |
| 292 | } else { |
| 293 | moan("bad mode: unexpected token"); |
| 294 | goto inval; |
| 295 | } |
| 296 | SKIPWS; |
| 297 | if (!*p) |
| 298 | break; |
| 299 | else if (*p != '|') { |
| 300 | moan("bad mode: expected `|'"); |
| 301 | goto inval; |
| 302 | } |
| 303 | p++; |
| 304 | SKIPWS; |
| 305 | } |
| 306 | } |
| 307 | |
| 308 | if ((fd = open(d.buf, mode, 0666)) < 0) ERROR1("open (%s)", d.buf); |
| 309 | if ((mode & O_ACCMODE) == O_WRONLY) { |
| 310 | DPUTS(&d, ".hash"); |
| 311 | if ((hfd = open(d.buf, |
| 312 | mode & (O_ACCMODE | O_CREAT | O_EXCL | O_TRUNC), |
| 313 | 0666)) < 0) { |
| 314 | close(fd); fd = -1; |
| 315 | ERROR1("open (%s)", d.buf); |
| 316 | } |
| 317 | sha256_init(&hc); |
| 318 | } |
| 319 | off = 0; |
| 320 | } break; |
| 321 | |
| 322 | case 'C': { |
| 323 | /* Chunoz\n -- close file */ |
| 324 | |
| 325 | uint8_t h[SHA256_DIGEST_SIZE], *p; |
| 326 | char hex[SHA256_DIGEST_SIZE * 2 + 1], *q; |
| 327 | unsigned i; |
| 328 | |
| 329 | ARG(d); CHECKFD; |
| 330 | if (close(fd)) ERROR("close (fd)"); |
| 331 | fd = -1; |
| 332 | if (hfd >= 0) { |
| 333 | sha256_digest(&hc, sizeof(h), h); |
| 334 | for (p = h, q = hex; p < h + sizeof(h); p++, q += 2) |
| 335 | sprintf(q, "%02x", *p); |
| 336 | *q++ = '\n'; |
| 337 | errno = EIO; |
| 338 | if (write(hfd, hex, sizeof(hex)) < sizeof(hex) || close(hfd)) |
| 339 | ERROR("close (hash)"); |
| 340 | hfd = -1; |
| 341 | } |
| 342 | } break; |
| 343 | |
| 344 | case 'L': { |
| 345 | /* Loffset\nwhence\n -- seek |
| 346 | * (warning: the manual page gets these the wrong way round) |
| 347 | */ |
| 348 | |
| 349 | int whence; |
| 350 | off_t offset; |
| 351 | |
| 352 | ARG(d); ARG(dd); CHECKFD; |
| 353 | offset = atoi(d.buf); whence = strtoull(dd.buf, 0, 0); |
| 354 | switch (whence) { |
| 355 | case LSEEK_GET_TAPEPOS: whence = SEEK_CUR; offset = 0; break; |
| 356 | case LSEEK_GO2_TAPEPOS: whence = SEEK_SET; break; |
| 357 | } |
| 358 | switch (whence) { |
| 359 | case SEEK_CUR: |
| 360 | if (!offset) { rc = off; break; } |
| 361 | default: |
| 362 | rc = lseek(fd, offset, whence); |
| 363 | if (rc == (off_t)-1) ERROR("seek"); |
| 364 | off = rc; |
| 365 | break; |
| 366 | } |
| 367 | } break; |
| 368 | |
| 369 | case 'W': { |
| 370 | /* Wlen\ndata... -- write */ |
| 371 | |
| 372 | size_t n, nn, sz; |
| 373 | ssize_t ssz; |
| 374 | unsigned char *p; |
| 375 | int botch = 0; |
| 376 | |
| 377 | ARG(d); CHECKFD; |
| 378 | rc = sz = strtoul(d.buf, 0, 0); |
| 379 | while (sz) { |
| 380 | nn = sz > BUFSZ ? BUFSZ : sz; |
| 381 | n = fread(buf, 1, nn, stdin); |
| 382 | if (n < nn) { |
| 383 | if (feof(stdin)) { moan("eof on stdin"); goto fail;} |
| 384 | else ERROR("read (stdin)"); |
| 385 | } |
| 386 | if (hfd >= 0) sha256_update(&hc, n, buf); |
| 387 | p = buf; |
| 388 | while (!botch && n) { |
| 389 | if ((ssz = write(fd, p, n)) > 0) { |
| 390 | p += ssz; off += ssz; n -= ssz; |
| 391 | } else if (!ssz) { moan("zero-length write"); goto fail; } |
| 392 | else if (errno != EINTR) { botch = errno; } |
| 393 | } |
| 394 | sz -= nn; |
| 395 | } |
| 396 | if (botch) { errno = botch; ERROR("write"); } |
| 397 | } break; |
| 398 | |
| 399 | case 'R': { |
| 400 | /* Rlen\n -- read */ |
| 401 | |
| 402 | size_t nn; |
| 403 | ssize_t ssz; |
| 404 | |
| 405 | ARG(d); CHECKFD; |
| 406 | nn = strtoul(d.buf, 0, 0); if (nn > BUFSZ) nn = BUFSZ; |
| 407 | if ((ssz = read(fd, buf, nn)) < 0) ERROR("read"); |
| 408 | off += ssz; |
| 409 | printf("A%ld\n", (long)ssz); |
| 410 | if (fwrite(buf, 1, ssz, stdout) < ssz) |
| 411 | { moan("write (stdout): %s", strerror(errno)); goto fail; } |
| 412 | continue; |
| 413 | } break; |
| 414 | |
| 415 | case 'i': case 'I': |
| 416 | /* Iop\ncount\n -- ioctl */ |
| 417 | ARG(d); ARG(dd); CHECKFD; goto notty; |
| 418 | |
| 419 | case 'S': |
| 420 | /* S -- ioctl */ |
| 421 | CHECKFD; goto notty; |
| 422 | case 's': |
| 423 | /* sop -- ioctl */ |
| 424 | |
| 425 | if ((ch = getchar()) == EOF) goto fail; |
| 426 | CHECKFD; goto notty; |
| 427 | |
| 428 | default: |
| 429 | goto fail; |
| 430 | } |
| 431 | |
| 432 | printf("A%llu\n", (unsigned long long)rc); |
| 433 | continue; |
| 434 | |
| 435 | badf: errno = EBADF; goto error; |
| 436 | range: errno = ERANGE; goto error; |
| 437 | inval: errno = EINVAL; goto error; |
| 438 | notty: errno = ENOTTY; goto error; |
| 439 | error: |
| 440 | printf("E%d\n%s\n", errno, strerror(errno)); |
| 441 | continue; |
| 442 | } |
| 443 | if (fflush(stdout) || ferror(stdout) || ferror(stdin)) goto fail; |
| 444 | return (0); |
| 445 | fail: |
| 446 | return (1); |
| 447 | } |
| 448 | |
| 449 | /*----- That's all, folks -------------------------------------------------*/ |