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

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