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