1 /* 2 * Copyright (c) 2002 Marcel Moolenaar 3 * Copyright (c) 2022 Tobias C. Berner 4 * 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 * 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR 17 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES 18 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. 19 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT 21 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, 22 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY 23 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 24 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF 25 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 26 * 27 */ 28 29 #include <sys/capsicum.h> 30 31 #include <capsicum_helpers.h> 32 #include <err.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <unistd.h> 36 #include <uuid.h> 37 38 static void 39 usage(void) 40 { 41 (void)fprintf(stderr, 42 "usage: uuidgen [-1] [-r] [-n count] [-o filename]\n"); 43 exit(1); 44 } 45 46 static void 47 uuid_to_compact_string(const uuid_t *u, char **s, uint32_t *status) 48 { 49 uuid_t nil; 50 51 if (status != NULL) 52 *status = uuid_s_ok; 53 54 if (s == NULL) 55 return; 56 57 if (u == NULL) { 58 u = &nil; 59 uuid_create_nil(&nil, NULL); 60 } 61 62 asprintf(s, "%08x%04x%04x%02x%02x%02x%02x%02x%02x%02x%02x", 63 u->time_low, u->time_mid, u->time_hi_and_version, 64 u->clock_seq_hi_and_reserved, u->clock_seq_low, u->node[0], 65 u->node[1], u->node[2], u->node[3], u->node[4], u->node[5]); 66 67 if (*s == NULL && status != NULL) 68 *status = uuid_s_no_memory; 69 } 70 71 static int 72 uuidgen_v4(struct uuid *store, int count) 73 { 74 int size; 75 struct uuid *item; 76 77 if (count < 1) { 78 errno = EINVAL; 79 return (-1); 80 } 81 size = sizeof(struct uuid) * count; 82 arc4random_buf(store, size); 83 item = store; 84 for (int i = 0; i < count; ++i) { 85 /* 86 * Set the two most significant bits (bits 6 and 7) of the 87 * clock_seq_hi_and_reserved to zero and one, respectively. 88 */ 89 item->clock_seq_hi_and_reserved &= ~(3 << 6); 90 item->clock_seq_hi_and_reserved |= (2 << 6); 91 /* 92 * Set the four most significant bits (bits 12 through 15) of 93 * the time_hi_and_version field to the 4-bit version number 94 * from Section 4.1.3. 95 */ 96 item->time_hi_and_version &= ~(15 << 12); 97 item->time_hi_and_version |= (4 << 12); 98 item++; 99 }; 100 return (0); 101 } 102 103 int 104 main(int argc, char *argv[]) 105 { 106 FILE *fp; 107 uuid_t *store, *uuid; 108 char *p; 109 int ch, count, i, iterate, status, version; 110 void (*tostring)(const uuid_t *, char **, uint32_t *) = uuid_to_string; 111 112 count = -1; /* no count yet */ 113 fp = stdout; /* default output file */ 114 iterate = 0; /* not one at a time */ 115 version = 1; /* create uuid v1 by default */ 116 while ((ch = getopt(argc, argv, "1crn:o:")) != -1) 117 switch (ch) { 118 case '1': 119 iterate = 1; 120 break; 121 case 'c': 122 tostring = uuid_to_compact_string; 123 break; 124 case 'r': 125 version = 4; 126 break; 127 case 'n': 128 if (count > 0) 129 usage(); 130 count = strtol(optarg, &p, 10); 131 if (*p != 0 || count < 1) 132 usage(); 133 break; 134 case 'o': 135 if (fp != stdout) 136 errx(1, "multiple output files not allowed"); 137 fp = fopen(optarg, "w"); 138 if (fp == NULL) 139 err(1, "fopen"); 140 break; 141 default: 142 usage(); 143 } 144 argv += optind; 145 argc -= optind; 146 147 if (argc) 148 usage(); 149 150 caph_cache_catpages(); 151 if (caph_limit_stdio() < 0) 152 err(1, "Unable to limit stdio"); 153 if (caph_enter() < 0) 154 err(1, "Unable to enter capability mode"); 155 156 if (count == -1) 157 count = 1; 158 159 store = (uuid_t *)malloc(sizeof(uuid_t) * count); 160 if (store == NULL) 161 err(1, "malloc()"); 162 163 if (!iterate) { 164 /* Get them all in a single batch */ 165 if (version == 1) { 166 if (uuidgen(store, count) != 0) 167 err(1, "uuidgen()"); 168 } else if (version == 4) { 169 if (uuidgen_v4(store, count) != 0) 170 err(1, "uuidgen_v4()"); 171 } else { 172 err(1, "unsupported version"); 173 } 174 } else { 175 uuid = store; 176 for (i = 0; i < count; i++) { 177 if (version == 1) { 178 if (uuidgen(uuid++, 1) != 0) 179 err(1, "uuidgen()"); 180 } else if (version == 4) { 181 if (uuidgen_v4(uuid++, 1) != 0) 182 err(1, "uuidgen_v4()"); 183 } else { 184 err(1, "unsupported version"); 185 } 186 } 187 } 188 189 uuid = store; 190 while (count--) { 191 tostring(uuid++, &p, &status); 192 if (status != uuid_s_ok) 193 err(1, "cannot stringify a UUID"); 194 fprintf(fp, "%s\n", p); 195 free(p); 196 } 197 198 free(store); 199 if (fp != stdout) 200 fclose(fp); 201 return (0); 202 } 203