1 /* 2 * Copyright (c) 2000 Peter Wemm <peter@freebsd.org> 3 * 4 * Redistribution and use in source and binary forms, with or without 5 * modification, are permitted provided that the following conditions 6 * are met: 7 * 1. Redistributions of source code must retain the above copyright 8 * notice, this list of conditions and the following disclaimer. 9 * 2. Redistributions in binary form must reproduce the above copyright 10 * notice, this list of conditions and the following disclaimer in the 11 * documentation and/or other materials provided with the distribution. 12 * 13 * THIS SOFTWARE IS PROVIDED BY THE AUTHORS AND CONTRIBUTORS ``AS IS'' AND 14 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 16 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHORS OR CONTRIBUTORS BE LIABLE 17 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 18 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 19 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 20 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 21 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 22 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 23 * SUCH DAMAGE. 24 * 25 * $FreeBSD: src/usr.bin/kenv/kenv.c,v 1.1.2.2 2001/12/19 04:52:15 dd Exp $ 26 * $DragonFly: src/usr.bin/kenv/kenv.c,v 1.2 2003/06/17 04:29:27 dillon Exp $ 27 */ 28 #include <sys/types.h> 29 #include <sys/sysctl.h> 30 #include <stdlib.h> 31 #include <stdio.h> 32 #include <string.h> 33 #include <errno.h> 34 #include <err.h> 35 #include <unistd.h> 36 37 static char sbuf[1024]; 38 39 static void 40 usage(void) 41 { 42 (void)fprintf(stderr, "usage: kenv [-h] [variable]\n"); 43 exit(1); 44 } 45 46 int 47 main(int argc, char **argv) 48 { 49 int name2oid_oid[2]; 50 int real_oid[CTL_MAXNAME+4]; 51 size_t oidlen; 52 int ch, error, hflag, i, slen; 53 char *env, *eq, *name, *var, *val; 54 55 hflag = 0; 56 env = NULL; 57 while ((ch = getopt(argc, argv, "h")) != -1) { 58 switch (ch) { 59 case 'h': 60 hflag++; 61 break; 62 default: 63 usage(); 64 } 65 } 66 argc -= optind; 67 argv += optind; 68 if (argc > 0) { 69 env = argv[0]; 70 argv++; 71 argc--; 72 } 73 if (argc > 0) 74 usage(); 75 name2oid_oid[0] = 0; /* This is magic & undocumented! */ 76 name2oid_oid[1] = 3; 77 oidlen = sizeof(real_oid); 78 name = "kern.environment"; 79 error = sysctl(name2oid_oid, 2, real_oid, &oidlen, name, strlen(name)); 80 if (error < 0) 81 err(1, "cannot find kern.environment base sysctl OID"); 82 oidlen /= sizeof (int); 83 if (oidlen >= CTL_MAXNAME) 84 errx(1, "kern.environment OID is too large!"); 85 real_oid[oidlen] = 0; 86 for (i = 0; ; i++) { 87 real_oid[oidlen + 1] = i; 88 slen = sizeof(sbuf) - 1; 89 error = sysctl(real_oid, oidlen + 2, sbuf, &slen, NULL, 0); 90 if (error < 0) { 91 if (errno != ENOENT) 92 err(1, "sysctl kern.environment.%d\n", i); 93 break; 94 } 95 sbuf[sizeof(sbuf) - 1] = '\0'; 96 eq = strchr(sbuf, '='); 97 if (eq == NULL) 98 err(1, "malformed environment string: %s\n", sbuf); 99 var = sbuf; 100 *eq = '\0'; 101 val = eq + 1; 102 if (env) { 103 if (strcmp(var, env) != 0) 104 continue; 105 printf("%s\n", val); 106 break; 107 } 108 if (hflag) { 109 if (strncmp(var, "hint.", 5) != 0) 110 continue; 111 /* FALLTHROUGH */ 112 } 113 printf("%s=\"", var); 114 while (*val) { 115 switch (*val) { 116 case '"': 117 putchar('\\'); 118 putchar('"'); 119 break; 120 case '\\': 121 putchar('\\'); 122 putchar('\\'); 123 break; 124 default: 125 putchar(*val); 126 break; 127 } 128 val++; 129 } 130 printf("\"\n"); 131 } 132 exit(0); 133 } 134