1 /* $NetBSD: env.c,v 1.14 2021/06/21 03:14:40 christos Exp $ */ 2 3 /*- 4 * Copyright (c) 2008 David Young. All rights reserved. 5 * 6 * Redistribution and use in source and binary forms, with or without 7 * modification, are permitted provided that the following conditions 8 * are met: 9 * 1. Redistributions of source code must retain the above copyright 10 * notice, this list of conditions and the following disclaimer. 11 * 2. Redistributions in binary form must reproduce the above copyright 12 * notice, this list of conditions and the following disclaimer in the 13 * documentation and/or other materials provided with the distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 16 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 17 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 18 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 19 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 20 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 21 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 22 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 23 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 24 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 25 * SUCH DAMAGE. 26 */ 27 28 #include <sys/cdefs.h> 29 #ifndef lint 30 __RCSID("$NetBSD: env.c,v 1.14 2021/06/21 03:14:40 christos Exp $"); 31 #endif /* not lint */ 32 33 #include <errno.h> 34 #include <string.h> 35 #include <stdlib.h> 36 #include <util.h> 37 38 #include <net/if.h> 39 #include <sys/socket.h> 40 #include <sys/ioctl.h> 41 42 #include "env.h" 43 #include "util.h" 44 #include "prog_ops.h" 45 46 prop_dictionary_t 47 prop_dictionary_augment(prop_dictionary_t bottom, prop_dictionary_t top) 48 { 49 prop_object_iterator_t i; 50 prop_dictionary_t d; 51 prop_object_t ko, o; 52 prop_dictionary_keysym_t k; 53 const char *key; 54 55 d = prop_dictionary_copy_mutable(bottom); 56 if (d == NULL) 57 return NULL; 58 59 i = prop_dictionary_iterator(top); 60 61 while (i != NULL && (ko = prop_object_iterator_next(i)) != NULL) { 62 k = (prop_dictionary_keysym_t)ko; 63 key = prop_dictionary_keysym_value(k); 64 o = prop_dictionary_get_keysym(top, k); 65 if (o == NULL || !prop_dictionary_set(d, key, o)) { 66 prop_object_release((prop_object_t)d); 67 d = NULL; 68 break; 69 } 70 } 71 if (i != NULL) 72 prop_object_iterator_release(i); 73 if (d != NULL) 74 prop_dictionary_make_immutable(d); 75 return d; 76 } 77 78 int 79 getifflags(prop_dictionary_t env, prop_dictionary_t oenv, 80 unsigned short *flagsp) 81 { 82 struct ifreq ifr; 83 const char *ifname; 84 uint64_t ifflags; 85 int s; 86 87 if (prop_dictionary_get_uint64(env, "ifflags", &ifflags)) { 88 *flagsp = (unsigned short)ifflags; 89 return 0; 90 } 91 92 if ((s = getsock(AF_UNSPEC)) == -1) 93 return -1; 94 95 if ((ifname = getifname(env)) == NULL) 96 return -1; 97 98 memset(&ifr, 0, sizeof(ifr)); 99 estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name)); 100 if (prog_ioctl(s, SIOCGIFFLAGS, &ifr) == -1) 101 return -1; 102 103 *flagsp = (unsigned short)ifr.ifr_flags; 104 105 prop_dictionary_set_uint64(oenv, "ifflags", 106 (unsigned short)ifr.ifr_flags); 107 108 return 0; 109 } 110 111 const char * 112 getifinfo(prop_dictionary_t env, prop_dictionary_t oenv, unsigned short *flagsp) 113 { 114 if (getifflags(env, oenv, flagsp) == -1) 115 return NULL; 116 117 return getifname(env); 118 } 119 120 const char * 121 getifname(prop_dictionary_t env) 122 { 123 const char *s; 124 125 return prop_dictionary_get_string(env, "if", &s) ? s : NULL; 126 } 127 128 ssize_t 129 getargdata(prop_dictionary_t env, const char *key, uint8_t *buf, size_t buflen) 130 { 131 prop_data_t data; 132 size_t datalen; 133 134 data = (prop_data_t)prop_dictionary_get(env, key); 135 if (data == NULL) { 136 errno = ENOENT; 137 return -1; 138 } 139 datalen = prop_data_size(data); 140 if (datalen > buflen) { 141 errno = ENAMETOOLONG; 142 return -1; 143 } 144 memcpy(buf, prop_data_value(data), datalen); 145 memset(buf + datalen, 0, buflen - datalen); 146 return datalen; 147 } 148 149 ssize_t 150 getargstr(prop_dictionary_t env, const char *key, char *buf, size_t buflen) 151 { 152 prop_data_t data; 153 size_t datalen; 154 155 data = (prop_data_t)prop_dictionary_get(env, key); 156 if (data == NULL) { 157 errno = ENOENT; 158 return -1; 159 } 160 datalen = prop_data_size(data); 161 if (datalen >= buflen) { 162 errno = ENAMETOOLONG; 163 return -1; 164 } 165 memcpy(buf, prop_data_value(data), datalen); 166 memset(buf + datalen, 0, buflen - datalen); 167 return datalen; 168 } 169 170 int 171 getaf(prop_dictionary_t env) 172 { 173 int64_t af; 174 175 if (!prop_dictionary_get_int64(env, "af", &af)) { 176 errno = ENOENT; 177 return -1; 178 } 179 return (int)af; 180 } 181