trustcache.c

   1 /*-
   2  * SPDX-License-Identifier: BSD-2-Clause
   3  *
   4  * Copyright (c) 2022 Cameron Katri.  All rights reserved.
   5  *
   6  * Redistribution and use in source and binary forms, with or without
   7  * modification, are permitted provided that the following conditions
   8  * are met:
   9  * 1. Redistributions of source code must retain the above copyright
  10  *    notice, this list of conditions and the following disclaimer.
  11  * 2. Redistributions in binary form must reproduce the above copyright
  12  *    notice, this list of conditions and the following disclaimer in the
  13  *    documentation and/or other materials provided with the distribution.
  14  *
  15  * THIS SOFTWARE IS PROVIDED BY CAMERON KATRI AND CONTRIBUTORS ``AS IS'' AND
  16  * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
  17  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
  18  * ARE DISCLAIMED.  IN NO EVENT SHALL CAMERON KATRI OR CONTRIBUTORS BE LIABLE
  19  * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
  20  * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
  21  * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
  22  * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  23  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
  24  * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
  25  * SUCH DAMAGE.
  26  */
  27
  28 #include <errno.h>
  29 #include <getopt.h>
  30 #include <limits.h>
  31 #include <stdbool.h>
  32 #include <stdio.h>
  33 #include <stdlib.h>
  34 #include <string.h>
  35 #include <sysexits.h>
  36
  37 #include "trustcache.h"
  38
  39 int
  40 main(int argc, char **argv)
  41 {
  42         if (argc < 2) {
  43 help:
  44                 fprintf(stderr, "Usage: trustcache append [-f flags] [-u uuid | 0] infile file ...\n"
  45                                                                                 "       trustcache create [-u uuid] [-v version] outfile file ...\n"
  46                                                                                 "       trustcache info [-c] [-h] [-e entrynum] file\n"
  47                                                                                 "       trustcache remove [-k] file hash ...\n\n"
  48                                                                                 "See trustcache(1) for more information\n");
  49                 exit(1);
  50         }
  51
  52         int ret = 1;
  53
  54         if (strcmp(argv[1], "info") == 0)
  55                 ret = tcinfo(argc - 1, argv + 1);
  56         else if (strcmp(argv[1], "create") == 0)
  57                 ret = tccreate(argc - 1, argv + 1);
  58         else if (strcmp(argv[1], "append") == 0)
  59                 ret = tcappend(argc - 1, argv + 1);
  60         else if (strcmp(argv[1], "remove") == 0)
  61                 ret = tcremove(argc - 1, argv + 1);
  62         else
  63                 fprintf(stderr, "Unknown subcommand %s\n", argv[1]);
  64
  65         if (ret == -1)
  66                 goto help;
  67
  68         return ret;
  69 }
  70
  71 struct trust_cache
  72 opentrustcache(const char *path)
  73 {
  74         FILE *f;
  75         struct trust_cache cache;
  76
  77         if ((f = fopen(path, "r")) == NULL) {
  78                 fprintf(stderr, "%s: %s\n", path, strerror(errno));
  79                 exit(1);
  80         }
  81
  82         fread(&cache, sizeof(struct trust_cache) - sizeof(struct trust_cache_entry1*), 1, f);
  83         cache.version = le32toh(cache.version);
  84         cache.num_entries = le32toh(cache.num_entries);
  85
  86         if (cache.version == 0) {
  87                 if ((cache.hashes = calloc(cache.num_entries, sizeof(trust_cache_hash0))) == NULL)
  88                         exit(EX_OSERR);
  89                 fread(cache.hashes, sizeof(trust_cache_hash0), cache.num_entries, f);
  90         } else if (cache.version == 1) {
  91                 if ((cache.entries = calloc(cache.num_entries, sizeof(struct trust_cache_entry1))) == NULL)
  92                         exit(EX_OSERR);
  93                 fread(cache.entries, sizeof(struct trust_cache_entry1), cache.num_entries, f);
  94         } else {
  95                 fprintf(stderr, "%s: Unsupported version %i\n", path, cache.version);
  96                 exit(1);
  97         }
  98
  99         fclose(f);
 100         return cache;
 101 }
 102
 103 int
 104 writetrustcache(struct trust_cache cache, const char *path)
 105 {
 106         FILE *f = NULL;
 107         if ((f = fopen(path, "wb")) == NULL) {
 108                 fprintf(stderr, "%s: %s\n", path, strerror(errno));
 109                 return -1;
 110         }
 111
 112         cache.version = htole32(cache.version);
 113         cache.num_entries = htole32(cache.num_entries);
 114         fwrite(&cache, sizeof(struct trust_cache) - sizeof(struct trust_cache_entry1*), 1, f);
 115         cache.version = le32toh(cache.version);
 116         cache.num_entries = le32toh(cache.num_entries);
 117
 118         for (uint32_t i = 0; i < cache.num_entries; i++) {
 119                 if (cache.version == 0)
 120                         fwrite(&cache.hashes[i], sizeof(trust_cache_hash0), 1, f);
 121                 else if (cache.version == 1)
 122                         fwrite(&cache.entries[i], sizeof(struct trust_cache_entry1), 1, f);
 123         }
 124
 125         fclose(f);
 126         return 0;
 127 }