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env.c revision 1.6 
      1 /*	$NetBSD: env.c,v 1.6 2008/07/02 07:44:14 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 <sys/cdefs.h>
     29 #ifndef lint
     30 __RCSID("$NetBSD: env.c,v 1.6 2008/07/02 07:44:14 dyoung 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 
     45 prop_dictionary_t
     46 prop_dictionary_augment(prop_dictionary_t bottom, prop_dictionary_t top)
     47 {
     48 	prop_object_iterator_t i;
     49 	prop_dictionary_t d;
     50 	prop_object_t ko, o;
     51 	prop_dictionary_keysym_t k;
     52 	const char *key;
     53 
     54 	d = prop_dictionary_copy_mutable(bottom);
     55 
     56 	i = prop_dictionary_iterator(top);
     57 
     58 	while ((ko = prop_object_iterator_next(i)) != NULL) {
     59 		k = (prop_dictionary_keysym_t)ko;
     60 		key = prop_dictionary_keysym_cstring_nocopy(k);
     61 		o = prop_dictionary_get_keysym(top, k);
     62 		if (o == NULL || !prop_dictionary_set(d, key, o)) {
     63 			prop_object_release((prop_object_t)d);
     64 			d = NULL;
     65 			break;
     66 		}
     67 	}
     68 	prop_object_iterator_release(i);
     69 	prop_dictionary_make_immutable(d);
     70 	return d;
     71 }
     72 
     73 int
     74 getifflags(prop_dictionary_t env, prop_dictionary_t oenv,
     75     unsigned short *flagsp)
     76 {
     77 	struct ifreq ifr;
     78 	const char *ifname;
     79 	uint64_t ifflags;
     80 	int s;
     81 
     82 	if (prop_dictionary_get_uint64(env, "ifflags", &ifflags)) {
     83 		*flagsp = (unsigned short)ifflags;
     84 		return 0;
     85 	}
     86 
     87 	if ((s = getsock(AF_UNSPEC)) == -1)
     88 		return -1;
     89 
     90 	if ((ifname = getifname(env)) == NULL)
     91 		return -1;
     92 
     93 	memset(&ifr, 0, sizeof(ifr));
     94 	estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
     95 	if (ioctl(s, SIOCGIFFLAGS, &ifr) == -1)
     96 		return -1;
     97 
     98 	*flagsp = (unsigned short)ifr.ifr_flags;
     99 
    100 	prop_dictionary_set_uint64(oenv, "ifflags",
    101 	    (unsigned short)ifr.ifr_flags);
    102 
    103 	return 0;
    104 }
    105 
    106 const char *
    107 getifinfo(prop_dictionary_t env, prop_dictionary_t oenv, unsigned short *flagsp)
    108 {
    109 	if (getifflags(env, oenv, flagsp) == -1)
    110 		return NULL;
    111 
    112 	return getifname(env);
    113 }
    114 
    115 const char *
    116 getifname(prop_dictionary_t env)
    117 {
    118 	const char *s;
    119 
    120 	return prop_dictionary_get_cstring_nocopy(env, "if", &s) ? s : NULL;
    121 }
    122 
    123 ssize_t
    124 getargdata(prop_dictionary_t env, const char *key, uint8_t *buf, size_t buflen)
    125 {
    126 	prop_data_t data;
    127 	size_t datalen;
    128 
    129 	data = (prop_data_t)prop_dictionary_get(env, key);
    130 	if (data == NULL) {
    131 		errno = ENOENT;
    132 		return -1;
    133 	}
    134 	datalen = prop_data_size(data);
    135 	if (datalen > buflen) {
    136 		errno = ENAMETOOLONG;
    137 		return -1;
    138 	}
    139 	memset(buf, 0, buflen);
    140 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    141 	return datalen;
    142 }
    143 
    144 ssize_t
    145 getargstr(prop_dictionary_t env, const char *key, char *buf, size_t buflen)
    146 {
    147 	prop_data_t data;
    148 	size_t datalen;
    149 
    150 	data = (prop_data_t)prop_dictionary_get(env, key);
    151 	if (data == NULL) {
    152 		errno = ENOENT;
    153 		return -1;
    154 	}
    155 	datalen = prop_data_size(data);
    156 	if (datalen >= buflen) {
    157 		errno = ENAMETOOLONG;
    158 		return -1;
    159 	}
    160 	memset(buf, 0, buflen);
    161 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    162 	return datalen;
    163 }
    164 
    165 int
    166 getaf(prop_dictionary_t env)
    167 {
    168 	int64_t af;
    169 
    170 	if (!prop_dictionary_get_int64(env, "af", &af)) {
    171 		errno = ENOENT;
    172 		return -1;
    173 	}
    174 	return (int)af;
    175 }
    176