git.distorted.org.uk Git - u/mdw/catacomb/blob - progs/hashsum.c

   1 /* -*-c-*-
   2  *
   3  * Hash files using some secure hash function
   4  *
   5  * (c) 2000 Straylight/Edgeware
   6  */
   7
   8 /*----- Licensing notice --------------------------------------------------*
   9  *
  10  * This file is part of Catacomb.
  11  *
  12  * Catacomb is free software; you can redistribute it and/or modify
  13  * it under the terms of the GNU Library General Public License as
  14  * published by the Free Software Foundation; either version 2 of the
  15  * License, or (at your option) any later version.
  16  *
  17  * Catacomb is distributed in the hope that it will be useful,
  18  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  19  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  20  * GNU Library General Public License for more details.
  21  *
  22  * You should have received a copy of the GNU Library General Public
  23  * License along with Catacomb; if not, write to the Free
  24  * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
  25  * MA 02111-1307, USA.
  26  */
  27
  28 /*----- Header files ------------------------------------------------------*/
  29
  30 #define _FILE_OFFSET_BITS 64
  31
  32 #include "config.h"
  33
  34 #include <assert.h>
  35 #include <errno.h>
  36 #include <stdio.h>
  37 #include <stdlib.h>
  38 #include <string.h>
  39
  40 #include <mLib/alloc.h>
  41 #include <mLib/dstr.h>
  42 #include <mLib/mdwopt.h>
  43 #include <mLib/quis.h>
  44 #include <mLib/report.h>
  45 #include <mLib/sub.h>
  46
  47 #include "ghash.h"
  48 #include "cc.h"
  49
  50 /*----- Static variables --------------------------------------------------*/
  51
  52 #define f_bogus 1u
  53 #define f_verbose 2u
  54 #define f_check 4u
  55 #define f_files 8u
  56 #define f_oddhash 16u
  57 #define f_escape 32u
  58 #define f_oddenc 64u
  59
  60 /*----- Guts --------------------------------------------------------------*/
  61
  62 static int checkjunk(const char *path, const struct stat *st, void *p)
  63 {
  64   const char *what;
  65   fhashstate *fh = p;
  66
  67   if (!st) {
  68     if (fh->f & f_verbose)
  69       fprintf(stderr, "JUNK (error %s) %s\n", strerror(errno), path);
  70     else
  71       moan("couldn't stat junk file `%s': %s", path, strerror(errno));
  72   } else {
  73     what = describefile(st);
  74     if (fh->f & f_verbose)
  75       fprintf(stderr, "JUNK %s %s\n", what, path);
  76     else
  77       moan("found junk %s `%s'", what, path);
  78   }
  79   return (0);
  80 }
  81
  82 static int warnjunk(const char *path, const struct stat *st, void *p)
  83 {
  84   if (st)
  85     moan("unexpected %s `%s'", describefile(st), path);
  86   else
  87     moan("couldn't stat unexpected file `%s': %s", path, strerror(errno));
  88   return (0);
  89 }
  90
  91 static int checkhash(fhashstate *fh, const char *file, const encodeops *e)
  92 {
  93   int rc;
  94   hfpctx hfp;
  95   dstr dl = DSTR_INIT;
  96   dstr df = DSTR_INIT;
  97   unsigned long n = 0, nfail = 0;
  98   int hf;
  99
 100   if (!file || strcmp(file, "-") == 0)
 101     hfp.fp = stdin;
 102   else if ((hfp.fp = fopen(file, fh->f & GSF_RAW ? "r" : "rb")) == 0) {
 103     moan("couldn't open `%s': %s", file, strerror(errno));
 104     return (EXIT_FAILURE);
 105   }
 106
 107   hfp.dline = &dl;
 108   hfp.dfile = &df;
 109   hfp.hbuf = xmalloc(2 * fh->gch->hashsz);
 110   hfp.gch = fh->gch;
 111   hfp.ee = e;
 112   hfp.f = fh->f;
 113
 114   while ((hf = hfparse(&hfp)) != HF_EOF) {
 115     switch (hf) {
 116       case HF_HASH:
 117         xfree(hfp.hbuf);
 118         hfp.hbuf = xmalloc(2 * hfp.gch->hashsz);
 119         break;
 120       case HF_FILE:
 121         if (fhash(fh, df.buf, hfp.hbuf + hfp.gch->hashsz)) {
 122           moan("couldn't read `%s': %s", df.buf, strerror(errno));
 123           rc = EXIT_FAILURE;
 124           continue;
 125         }
 126         if (memcmp(hfp.hbuf, hfp.hbuf + hfp.gch->hashsz,
 127                    hfp.gch->hashsz) != 0) {
 128           if (hfp.f & f_verbose)
 129             fprintf(stderr, "FAIL %s\n", df.buf);
 130           else
 131             moan("%s check failed for `%s'", hfp.gch->name, df.buf);
 132           nfail++;
 133           rc = EXIT_FAILURE;
 134         } else {
 135           if (hfp.f & f_verbose)
 136             fprintf(stderr, "OK %s\n", df.buf);
 137         }
 138         n++;
 139     }
 140   }
 141
 142   if (ferror(hfp.fp)) {
 143     moan("error reading input `%s': %s",
 144          file ? file : "<stdin>", strerror(errno));
 145     rc = EXIT_FAILURE;
 146   }
 147   dstr_destroy(&dl);
 148   dstr_destroy(&df);
 149   xfree(hfp.hbuf);
 150   if ((fh->f & f_verbose) && nfail)
 151     moan("%lu of %lu file(s) failed %s check", nfail, n, hfp.gch->name);
 152   else if (!n)
 153     moan("no files checked");
 154   return (rc);
 155 }
 156
 157 static int dohash(fhashstate *fh, const char *file, const encodeops *e)
 158 {
 159   int rc = 0;
 160   octet *p = xmalloc(fh->gch->hashsz);
 161
 162   if (fhash(fh, file, p)) {
 163     moan("couldn't read `%s': %s", file ? file : "<stdin>", strerror(errno));
 164     rc = EXIT_FAILURE;
 165   } else {
 166     e->put(p, fh->gch->hashsz, stdout);
 167     if (file) {
 168       fputc(' ', stdout);
 169       fputc(fh->f & FHF_BINARY ? '*' : ' ', stdout);
 170       if (fh->f & f_escape)
 171         putstring(stdout, file, 0);
 172       else
 173         fputs(file, stdout);
 174     }
 175     fputc('\n', stdout);
 176   }
 177
 178   xfree(p);
 179   return (rc);
 180 }
 181
 182 static int dofile(fhashstate *fh, const char *file, const encodeops *e)
 183   { return (fh->f & f_check ? checkhash : dohash)(fh, file, e); }
 184
 185 static int hashfiles(fhashstate *fh, const char *file, const encodeops *e)
 186 {
 187   FILE *fp;
 188   dstr d = DSTR_INIT;
 189   int rc = 0;
 190   int rrc;
 191
 192   if (!file || strcmp(file, "-") == 0)
 193     fp = stdin;
 194   else if ((fp = fopen(file, fh->f & GSF_RAW ? "r" : "rb")) == 0) {
 195     moan("couldn't open `%s': %s", file, strerror(errno));
 196     return (EXIT_FAILURE);
 197   }
 198
 199   for (;;) {
 200     DRESET(&d);
 201     if (getstring(fp, &d, GSF_FILE | fh->f))
 202       break;
 203     if ((rrc = dofile(fh, d.buf, e)) != 0)
 204       rc = rrc;
 205   }
 206
 207   return (rc);
 208 }
 209
 210 static int hashsum(fhashstate *fh, const char *file, const encodeops *e)
 211   { return (fh->f & f_files ? hashfiles : dofile)(fh, file, e); }
 212
 213 /*----- Main driver -------------------------------------------------------*/
 214
 215 void version(FILE *fp)
 216 {
 217   pquis(fp, "$, Catacomb version " VERSION "\n");
 218 }
 219
 220 static void usage(FILE *fp)
 221 {
 222   pquis(fp, "Usage: $ [-f0ebcv] [-a ALGORITHM] [-E ENC] [FILES...]\n");
 223 }
 224
 225 static void help(FILE *fp, const gchash *gch)
 226 {
 227   version(fp);
 228   fputc('\n', fp);
 229   usage(fp);
 230   pquis(fp, "\n\
 231 Generates or checks message digests on files.  Options available:\n\
 232 \n\
 233 -h, --help              Display this help message.\n\
 234 -V, --version           Display program's version number.\n\
 235 -u, --usage             Display a terse usage message.\n\
 236 -l, --list [ITEM...]    Show known hash functions and/or encodings.\n\
 237 \n\
 238 -a, --algorithm=ALG     Use the message digest algorithm ALG.\n\
 239 -E, --encoding=ENC      Represent hashes using encoding ENC.\n\
 240 \n\
 241 -f, --files             Read a list of file names from standard input.\n\
 242 -0, --null              File names are null terminated, not plain text.\n\
 243 \n\
 244 -e, --escape            Escape funny characters in filenames.\n\
 245 -c, --check             Check message digests rather than emitting them.\n\
 246 -b, --binary            When reading files, treat them as binary.\n\
 247 -p, --progress          Show a progress indicator for large files.\n\
 248 -v, --verbose           Be verbose when checking digests.\n\
 249 \n\
 250 For a list of hashing algorithms and encodings, type `$ --list'.\n\
 251 ");
 252   if (gch)
 253     fprintf(fp, "The default message digest algorithm is %s.\n", gch->name);
 254 }
 255
 256 #define LISTS(LI)                                                       \
 257   LI("Lists", list, listtab[i].name, listtab[i].name)                   \
 258   LI("Hash functions", hash, ghashtab[i], ghashtab[i]->name)            \
 259   LI("Encodings", enc, encodingtab[i].name, encodingtab[i].name)
 260
 261 MAKELISTTAB(listtab, LISTS)
 262
 263 int main(int argc, char *argv[])
 264 {
 265   fhashstate fh;
 266   const encodeops *e = &encodingtab[ENC_HEX];
 267   int rc;
 268
 269   /* --- Initialization --- */
 270
 271   ego(argv[0]);
 272   sub_init();
 273   fhash_init(&fh, 0, 0);
 274
 275   /* --- Choose a hash function from the name --- */
 276
 277   {
 278     char *q = xstrdup(QUIS);
 279     size_t len = strlen(q);
 280     if (len > 3 && strcmp(q + len - 3, "sum") == 0) {
 281       q[len - 3] = 0;
 282       fh.gch = gethash(q);
 283     }
 284     if (!fh.gch)
 285       fh.gch = gethash("md5");
 286     xfree(q);
 287   }
 288
 289   /* --- Read options --- */
 290
 291   for (;;) {
 292     static struct option opts[] = {
 293       { "help",         0,              0,      'h' },
 294       { "verbose",      0,              0,      'V' },
 295       { "usage",        0,              0,      'u' },
 296
 297       { "algorithm",    OPTF_ARGREQ,    0,      'a' },
 298       { "hash",         OPTF_ARGREQ,    0,      'a' },
 299       { "encoding",     OPTF_ARGREQ,    0,      'E' },
 300       { "list",         0,              0,      'l' },
 301
 302       { "files",        0,              0,      'f' },
 303       { "find",         0,              0,      'f' },
 304       { "null",         0,              0,      '0' },
 305
 306       { "escape",       0,              0,      'e' },
 307       { "check",        0,              0,      'c' },
 308       { "junk",         0,              0,      'j' },
 309       { "binary",       0,              0,      'b' },
 310       { "verbose",      0,              0,      'v' },
 311       { "progress",     0,              0,      'p' },
 312
 313       { 0,              0,              0,      0 }
 314     };
 315     int i = mdwopt(argc, argv, "hVu a:E:l f0 ecjbvp", opts, 0, 0, 0);
 316     if (i < 0)
 317       break;
 318
 319     switch (i) {
 320       case 'h':
 321         help(stdout, fh.gch);
 322         exit(0);
 323       case 'V':
 324         version(stdout);
 325         exit(0);
 326       case 'u':
 327         usage(stdout);
 328         exit(0);
 329       case 'l':
 330         exit(displaylists(listtab, argv + optind));
 331       case 'a':
 332         if ((fh.gch = gethash(optarg)) == 0)
 333           die(EXIT_FAILURE, "unknown hash algorithm `%s'", optarg);
 334         fh.f |= f_oddhash;
 335         break;
 336       case 'E':
 337         if ((e = getencoding(optarg)) == 0)
 338           die(EXIT_FAILURE, "unknown encoding `%s'", optarg);
 339         fh.f |= f_oddenc;
 340         break;
 341       case 'f':
 342         fh.f |= f_files;
 343         break;
 344       case '0':
 345         fh.f |= GSF_RAW;
 346         break;
 347       case 'e':
 348         fh.f |= f_escape;
 349         break;
 350       case 'c':
 351         fh.f |= f_check;
 352         break;
 353       case 'j':
 354         fh.f |= FHF_JUNK;
 355         break;
 356       case 'b':
 357         fh.f |= FHF_BINARY;
 358         break;
 359       case 'v':
 360         fh.f |= f_verbose;
 361         break;
 362       case 'p':
 363         fh.f |= FHF_PROGRESS;
 364         break;
 365       default:
 366         fh.f |= f_bogus;
 367         break;
 368     }
 369   }
 370
 371   if (fh.f & f_bogus) {
 372     usage(stderr);
 373     exit(EXIT_FAILURE);
 374   }
 375   argv += optind;
 376   argc -= optind;
 377
 378   /* --- Generate output --- */
 379
 380   if (!(fh.f & f_check) && (argc || (fh.f & f_files))) {
 381     if (fh.f & f_oddhash) printf("#hash %s\n", fh.gch->name);
 382     if (fh.f & f_oddenc) printf("#encoding %s\n", e->name);
 383     if (fh.f & f_escape) fputs("#escape\n", stdout);
 384   }
 385   if (!argc)
 386     rc = hashsum(&fh, 0, e);
 387   else {
 388     int i;
 389     int rrc;
 390
 391     rc = 0;
 392     for (i = 0; i < argc; i++) {
 393       if ((rrc = hashsum(&fh, argv[i], e)) != 0)
 394         rc = rrc;
 395     }
 396   }
 397
 398   if (fh.f & FHF_JUNK) {
 399     if (fh.f & f_check) {
 400       if (fhash_junk(&fh, checkjunk, &fh)) rc = EXIT_FAILURE;
 401     } else {
 402       if (fhash_junk(&fh, warnjunk, 0) < 0) rc = EXIT_FAILURE;
 403     }
 404   }
 405   fhash_free(&fh);
 406
 407   return (rc);
 408 }
 409
 410 /*----- That's all, folks -------------------------------------------------*/