1 /* $OpenBSD: env.c,v 1.16 2015/10/10 21:19:14 deraadt Exp $ */ 2 3 /* 4 * Copyright (c) 1988, 1993, 1994 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 <err.h> 33 #include <errno.h> 34 #include <locale.h> 35 #include <stdio.h> 36 #include <stdlib.h> 37 #include <string.h> 38 #include <unistd.h> 39 40 __dead void usage(void); 41 42 int 43 main(int argc, char *argv[]) 44 { 45 extern char **environ; 46 extern int optind; 47 char **ep, *p; 48 int ch; 49 50 setlocale(LC_ALL, ""); 51 52 if (pledge("stdio exec", NULL) == -1) 53 err(1, "pledge"); 54 55 while ((ch = getopt(argc, argv, "i-")) != -1) 56 switch(ch) { 57 case '-': /* obsolete */ 58 case 'i': 59 if ((environ = calloc(1, sizeof(char *))) == NULL) 60 err(126, "calloc"); 61 break; 62 default: 63 usage(); 64 } 65 argc -= optind; 66 argv += optind; 67 68 for (; *argv && (p = strchr(*argv, '=')); ++argv) { 69 *p++ = '\0'; 70 if (setenv(*argv, p, 1) == -1) { 71 /* reuse 126, it matches the problem most */ 72 err(126, "setenv"); 73 } 74 } 75 76 if (*argv) { 77 /* 78 * return 127 if the command to be run could not be 79 * found; 126 if the command was found but could 80 * not be invoked 81 */ 82 execvp(*argv, argv); 83 err((errno == ENOENT) ? 127 : 126, "%s", *argv); 84 } 85 86 for (ep = environ; *ep; ep++) 87 (void)printf("%s\n", *ep); 88 89 exit(0); 90 } 91 92 void 93 usage(void) 94 { 95 extern char *__progname; 96 97 (void)fprintf(stderr, "usage: %s [-i] [name=value ...] " 98 "[utility [argument ...]]\n", __progname); 99 exit(1); 100 } 101