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 26 #include <sys/cdefs.h> 27 __FBSDID("$FreeBSD$"); 28 29 #include <sys/types.h> 30 #include <sys/sysctl.h> 31 #include <err.h> 32 #include <kenv.h> 33 #include <stdio.h> 34 #include <stdlib.h> 35 #include <string.h> 36 #include <unistd.h> 37 38 static void usage(void); 39 static int kdumpenv(void); 40 static int kgetenv(char *); 41 static int ksetenv(char *, char *); 42 static int kunsetenv(char *); 43 44 static int hflag = 0; 45 static int qflag = 0; 46 static int uflag = 0; 47 48 static void 49 usage(void) 50 { 51 (void)fprintf(stderr, "%s\n%s\n%s\n", 52 "usage: kenv [-hq]", 53 " kenv [-q] variable[=value]", 54 " kenv [-q] -u variable"); 55 exit(1); 56 } 57 58 int 59 main(int argc, char **argv) 60 { 61 char *env, *eq, *val; 62 int ch, error; 63 64 error = 0; 65 val = NULL; 66 env = NULL; 67 while ((ch = getopt(argc, argv, "hqu")) != -1) { 68 switch (ch) { 69 case 'h': 70 hflag++; 71 break; 72 case 'q': 73 qflag++; 74 break; 75 case 'u': 76 uflag++; 77 break; 78 default: 79 usage(); 80 } 81 } 82 argc -= optind; 83 argv += optind; 84 if (argc > 0) { 85 env = argv[0]; 86 eq = strchr(env, '='); 87 if (eq != NULL) { 88 *eq++ = '\0'; 89 val = eq; 90 } 91 argv++; 92 argc--; 93 } 94 if (hflag && (env != NULL)) 95 usage(); 96 if ((argc > 0) || (uflag && (env == NULL))) 97 usage(); 98 if (env == NULL) { 99 error = kdumpenv(); 100 if (error && !qflag) 101 warn("kdumpenv"); 102 } else if (val == NULL) { 103 if (uflag) { 104 error = kunsetenv(env); 105 if (error && !qflag) 106 warnx("unable to unset %s", env); 107 } else { 108 error = kgetenv(env); 109 if (error && !qflag) 110 warnx("unable to get %s", env); 111 } 112 } else { 113 error = ksetenv(env, val); 114 if (error && !qflag) 115 warnx("unable to set %s to %s", env, val); 116 } 117 return (error); 118 } 119 120 static int 121 kdumpenv(void) 122 { 123 char *buf, *cp; 124 int buflen, envlen; 125 126 envlen = kenv(KENV_DUMP, NULL, NULL, 0); 127 if (envlen < 0) 128 return (-1); 129 for (;;) { 130 buflen = envlen * 120 / 100; 131 buf = malloc(buflen + 1); 132 if (buf == NULL) 133 return (-1); 134 memset(buf, 0, buflen + 1); /* Be defensive */ 135 envlen = kenv(KENV_DUMP, NULL, buf, buflen); 136 if (envlen < 0) { 137 free(buf); 138 return (-1); 139 } 140 if (envlen > buflen) 141 free(buf); 142 else 143 break; 144 } 145 146 for (; *buf != '\0'; buf += strlen(buf) + 1) { 147 if (hflag) { 148 if (strncmp(buf, "hint.", 5) != 0) 149 continue; 150 } 151 cp = strchr(buf, '='); 152 if (cp == NULL) 153 continue; 154 *cp++ = '\0'; 155 printf("%s=\"%s\"\n", buf, cp); 156 buf = cp; 157 } 158 return (0); 159 } 160 161 static int 162 kgetenv(char *env) 163 { 164 char buf[1024]; 165 int ret; 166 167 ret = kenv(KENV_GET, env, buf, sizeof(buf)); 168 if (ret == -1) 169 return (ret); 170 printf("%s\n", buf); 171 return (0); 172 } 173 174 static int 175 ksetenv(char *env, char *val) 176 { 177 int ret; 178 179 ret = kenv(KENV_SET, env, val, strlen(val)+1); 180 if (ret == 0) 181 printf("%s=\"%s\"\n", env, val); 182 return (ret); 183 } 184 185 static int 186 kunsetenv(char *env) 187 { 188 int ret; 189 190 ret = kenv(KENV_UNSET, env, NULL, 0); 191 return (ret); 192 } 193