1 /*- 2 * SPDX-License-Identifier: BSD-3-Clause 3 * 4 * Copyright (c) 1987, 1993 5 * The Regents of the University of California. All rights reserved. 6 * 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 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 * 3. Neither the name of the University nor the names of its contributors 16 * may be used to endorse or promote products derived from this software 17 * without specific prior written permission. 18 * 19 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND 20 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 21 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 22 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE 23 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 24 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 25 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 26 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 27 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 28 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 29 * SUCH DAMAGE. 30 */ 31 32 #include <sys/types.h> 33 34 #include <capsicum_helpers.h> 35 #include <err.h> 36 #include <stdlib.h> 37 #include <stdio.h> 38 #include <string.h> 39 #include <unistd.h> 40 41 void usage(void); 42 extern char **environ; 43 44 /* 45 * printenv 46 * 47 * Bill Joy, UCB 48 * February, 1979 49 */ 50 int 51 main(int argc, char *argv[]) 52 { 53 char *cp, **ep; 54 size_t len; 55 int ch; 56 57 if (caph_limit_stdio() < 0 || caph_enter() < 0) 58 err(1, "capsicum"); 59 60 while ((ch = getopt(argc, argv, "")) != -1) 61 switch(ch) { 62 case '?': 63 default: 64 usage(); 65 } 66 argc -= optind; 67 argv += optind; 68 69 if (argc == 0) { 70 for (ep = environ; *ep; ep++) 71 (void)printf("%s\n", *ep); 72 exit(0); 73 } 74 len = strlen(*argv); 75 for (ep = environ; *ep; ep++) 76 if (!memcmp(*ep, *argv, len)) { 77 cp = *ep + len; 78 if (*cp == '=') { 79 (void)printf("%s\n", cp + 1); 80 exit(0); 81 } 82 } 83 exit(1); 84 } 85 86 void 87 usage(void) 88 { 89 (void)fprintf(stderr, "usage: printenv [name]\n"); 90 exit(1); 91 } 92