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env.c revision 1.3 
      1 /*	$NetBSD: env.c,v 1.3 2008/05/06 18:35:38 dyoung 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 <errno.h>
     29 #include <string.h>
     30 #include <stdlib.h>
     31 #include <util.h>
     32 
     33 #include <net/if.h>
     34 #include <sys/socket.h>
     35 #include <sys/ioctl.h>
     36 
     37 #include "env.h"
     38 #include "util.h"
     39 
     40 prop_dictionary_t
     41 prop_dictionary_augment(prop_dictionary_t bottom, prop_dictionary_t top)
     42 {
     43 	prop_object_iterator_t i;
     44 	prop_dictionary_t d;
     45 	prop_object_t ko, o;
     46 	prop_dictionary_keysym_t k;
     47 	const char *key;
     48 
     49 	d = prop_dictionary_copy_mutable(bottom);
     50 
     51 	i = prop_dictionary_iterator(top);
     52 
     53 	while ((ko = prop_object_iterator_next(i)) != NULL) {
     54 		k = (prop_dictionary_keysym_t)ko;
     55 		key = prop_dictionary_keysym_cstring_nocopy(k);
     56 		o = prop_dictionary_get_keysym(top, k);
     57 		if (o == NULL || !prop_dictionary_set(d, key, o)) {
     58 			prop_object_release((prop_object_t)d);
     59 			d = NULL;
     60 			break;
     61 		}
     62 	}
     63 	prop_object_iterator_release(i);
     64 	prop_dictionary_make_immutable(d);
     65 	return d;
     66 }
     67 
     68 int
     69 getifflags(prop_dictionary_t env, prop_dictionary_t oenv,
     70     unsigned short *flagsp)
     71 {
     72 	struct ifreq ifr;
     73 	const char *ifname;
     74 	uint64_t ifflags;
     75 	int s;
     76 
     77 	if (prop_dictionary_get_uint64(env, "ifflags", &ifflags)) {
     78 		*flagsp = (unsigned short)ifflags;
     79 		return 0;
     80 	}
     81 
     82 	if ((s = getsock(AF_UNSPEC)) == -1)
     83 		return -1;
     84 
     85 	if ((ifname = getifname(env)) == NULL)
     86 		return -1;
     87 
     88 	memset(&ifr, 0, sizeof(ifr));
     89 	estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
     90 	if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1)
     91 		return -1;
     92 
     93 	*flagsp = (unsigned short)ifr.ifr_flags;
     94 
     95 	prop_dictionary_set_uint64(oenv, "ifflags",
     96 	    (unsigned short)ifr.ifr_flags);
     97 
     98 	return 0;
     99 }
    100 
    101 const char *
    102 getifinfo(prop_dictionary_t env, prop_dictionary_t oenv, unsigned short *flagsp)
    103 {
    104 	if (getifflags(env, oenv, flagsp) == -1)
    105 		return NULL;
    106 
    107 	return getifname(env);
    108 }
    109 
    110 const char *
    111 getifname(prop_dictionary_t env)
    112 {
    113 	const char *s;
    114 
    115 	return prop_dictionary_get_cstring_nocopy(env, "if", &s) ? s : NULL;
    116 }
    117 
    118 ssize_t
    119 getargdata(prop_dictionary_t env, const char *key, uint8_t *buf, size_t buflen)
    120 {
    121 	prop_data_t data;
    122 	size_t datalen;
    123 
    124 	data = (prop_data_t)prop_dictionary_get(env, key);
    125 	if (data == NULL) {
    126 		errno = ENOENT;
    127 		return -1;
    128 	}
    129 	datalen = prop_data_size(data);
    130 	if (datalen > buflen) {
    131 		errno = ENAMETOOLONG;
    132 		return -1;
    133 	}
    134 	memset(buf, 0, buflen);
    135 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    136 	return datalen;
    137 }
    138 
    139 ssize_t
    140 getargstr(prop_dictionary_t env, const char *key, char *buf, size_t buflen)
    141 {
    142 	prop_data_t data;
    143 	size_t datalen;
    144 
    145 	data = (prop_data_t)prop_dictionary_get(env, "bssid");
    146 	if (data == NULL) {
    147 		errno = ENOENT;
    148 		return -1;
    149 	}
    150 	datalen = prop_data_size(data);
    151 	if (datalen >= buflen) {
    152 		errno = ENAMETOOLONG;
    153 		return -1;
    154 	}
    155 	memset(buf, 0, buflen);
    156 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    157 	return datalen;
    158 }
    159 
    160 int
    161 getaf(prop_dictionary_t env)
    162 {
    163 	int64_t af;
    164 
    165 	if (!prop_dictionary_get_int64(env, "af", &af)) {
    166 		errno = ENOENT;
    167 		return -1;
    168 	}
    169 	return (int)af;
    170 }
    171