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/cdefs.h> 30 __FBSDID("$FreeBSD$"); 31 32 #include <sys/capsicum.h> 33 34 #include <capsicum_helpers.h> 35 #include <err.h> 36 #include <stdio.h> 37 #include <stdlib.h> 38 #include <unistd.h> 39 #include <uuid.h> 40 41 static void 42 usage(void) 43 { 44 (void)fprintf(stderr, 45 "usage: uuidgen [-1] [-r] [-n count] [-o filename]\n"); 46 exit(1); 47 } 48 49 static int 50 uuidgen_v4(struct uuid *store, int count) 51 { 52 int size; 53 struct uuid *item; 54 55 if (count < 1) { 56 errno = EINVAL; 57 return (-1); 58 } 59 size = sizeof(struct uuid) * count; 60 arc4random_buf(store, size); 61 item = store; 62 for (int i = 0; i < count; ++i) { 63 /* 64 * Set the two most significant bits (bits 6 and 7) of the 65 * clock_seq_hi_and_reserved to zero and one, respectively. 66 */ 67 item->clock_seq_hi_and_reserved &= ~(3 << 6); 68 item->clock_seq_hi_and_reserved |= (2 << 6); 69 /* 70 * Set the four most significant bits (bits 12 through 15) of 71 * the time_hi_and_version field to the 4-bit version number 72 * from Section 4.1.3. 73 */ 74 item->time_hi_and_version &= ~(15 << 12); 75 item->time_hi_and_version |= (4 << 12); 76 item++; 77 }; 78 return (0); 79 } 80 81 int 82 main(int argc, char *argv[]) 83 { 84 FILE *fp; 85 uuid_t *store, *uuid; 86 char *p; 87 int ch, count, i, iterate, status, version; 88 89 count = -1; /* no count yet */ 90 fp = stdout; /* default output file */ 91 iterate = 0; /* not one at a time */ 92 version = 1; /* create uuid v1 by default */ 93 while ((ch = getopt(argc, argv, "1rn:o:")) != -1) 94 switch (ch) { 95 case '1': 96 iterate = 1; 97 break; 98 case 'r': 99 version = 4; 100 break; 101 case 'n': 102 if (count > 0) 103 usage(); 104 count = strtol(optarg, &p, 10); 105 if (*p != 0 || count < 1) 106 usage(); 107 break; 108 case 'o': 109 if (fp != stdout) 110 errx(1, "multiple output files not allowed"); 111 fp = fopen(optarg, "w"); 112 if (fp == NULL) 113 err(1, "fopen"); 114 break; 115 default: 116 usage(); 117 } 118 argv += optind; 119 argc -= optind; 120 121 if (argc) 122 usage(); 123 124 caph_cache_catpages(); 125 if (caph_limit_stdio() < 0) 126 err(1, "Unable to limit stdio"); 127 if (caph_enter() < 0) 128 err(1, "Unable to enter capability mode"); 129 130 if (count == -1) 131 count = 1; 132 133 store = (uuid_t *)malloc(sizeof(uuid_t) * count); 134 if (store == NULL) 135 err(1, "malloc()"); 136 137 if (!iterate) { 138 /* Get them all in a single batch */ 139 if (version == 1) { 140 if (uuidgen(store, count) != 0) 141 err(1, "uuidgen()"); 142 } else if (version == 4) { 143 if (uuidgen_v4(store, count) != 0) 144 err(1, "uuidgen_v4()"); 145 } else { 146 err(1, "unsupported version"); 147 } 148 } else { 149 uuid = store; 150 for (i = 0; i < count; i++) { 151 if (version == 1) { 152 if (uuidgen(uuid++, 1) != 0) 153 err(1, "uuidgen()"); 154 } else if (version == 4) { 155 if (uuidgen_v4(uuid++, 1) != 0) 156 err(1, "uuidgen_v4()"); 157 } else { 158 err(1, "unsupported version"); 159 } 160 } 161 } 162 163 uuid = store; 164 while (count--) { 165 uuid_to_string(uuid++, &p, &status); 166 if (status != uuid_s_ok) 167 err(1, "cannot stringify a UUID"); 168 fprintf(fp, "%s\n", p); 169 free(p); 170 } 171 172 free(store); 173 if (fp != stdout) 174 fclose(fp); 175 return (0); 176 } 177