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env.c revision 1.7 
      1 /*	$NetBSD: env.c,v 1.7 2010/12/13 17:35:08 pooka 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 1.7 2010/12/13 17:35:08 pooka 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 
     57 	i = prop_dictionary_iterator(top);
     58 
     59 	while ((ko = prop_object_iterator_next(i)) != NULL) {
     60 		k = (prop_dictionary_keysym_t)ko;
     61 		key = prop_dictionary_keysym_cstring_nocopy(k);
     62 		o = prop_dictionary_get_keysym(top, k);
     63 		if (o == NULL || !prop_dictionary_set(d, key, o)) {
     64 			prop_object_release((prop_object_t)d);
     65 			d = NULL;
     66 			break;
     67 		}
     68 	}
     69 	prop_object_iterator_release(i);
     70 	prop_dictionary_make_immutable(d);
     71 	return d;
     72 }
     73 
     74 int
     75 getifflags(prop_dictionary_t env, prop_dictionary_t oenv,
     76     unsigned short *flagsp)
     77 {
     78 	struct ifreq ifr;
     79 	const char *ifname;
     80 	uint64_t ifflags;
     81 	int s;
     82 
     83 	if (prop_dictionary_get_uint64(env, "ifflags", &ifflags)) {
     84 		*flagsp = (unsigned short)ifflags;
     85 		return 0;
     86 	}
     87 
     88 	if ((s = getsock(AF_UNSPEC)) == -1)
     89 		return -1;
     90 
     91 	if ((ifname = getifname(env)) == NULL)
     92 		return -1;
     93 
     94 	memset(&ifr, 0, sizeof(ifr));
     95 	estrlcpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
     96 	if (prog_ioctl(s, SIOCGIFFLAGS, &ifr) == -1)
     97 		return -1;
     98 
     99 	*flagsp = (unsigned short)ifr.ifr_flags;
    100 
    101 	prop_dictionary_set_uint64(oenv, "ifflags",
    102 	    (unsigned short)ifr.ifr_flags);
    103 
    104 	return 0;
    105 }
    106 
    107 const char *
    108 getifinfo(prop_dictionary_t env, prop_dictionary_t oenv, unsigned short *flagsp)
    109 {
    110 	if (getifflags(env, oenv, flagsp) == -1)
    111 		return NULL;
    112 
    113 	return getifname(env);
    114 }
    115 
    116 const char *
    117 getifname(prop_dictionary_t env)
    118 {
    119 	const char *s;
    120 
    121 	return prop_dictionary_get_cstring_nocopy(env, "if", &s) ? s : NULL;
    122 }
    123 
    124 ssize_t
    125 getargdata(prop_dictionary_t env, const char *key, uint8_t *buf, size_t buflen)
    126 {
    127 	prop_data_t data;
    128 	size_t datalen;
    129 
    130 	data = (prop_data_t)prop_dictionary_get(env, key);
    131 	if (data == NULL) {
    132 		errno = ENOENT;
    133 		return -1;
    134 	}
    135 	datalen = prop_data_size(data);
    136 	if (datalen > buflen) {
    137 		errno = ENAMETOOLONG;
    138 		return -1;
    139 	}
    140 	memset(buf, 0, buflen);
    141 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    142 	return datalen;
    143 }
    144 
    145 ssize_t
    146 getargstr(prop_dictionary_t env, const char *key, char *buf, size_t buflen)
    147 {
    148 	prop_data_t data;
    149 	size_t datalen;
    150 
    151 	data = (prop_data_t)prop_dictionary_get(env, key);
    152 	if (data == NULL) {
    153 		errno = ENOENT;
    154 		return -1;
    155 	}
    156 	datalen = prop_data_size(data);
    157 	if (datalen >= buflen) {
    158 		errno = ENAMETOOLONG;
    159 		return -1;
    160 	}
    161 	memset(buf, 0, buflen);
    162 	memcpy(buf, prop_data_data_nocopy(data), datalen);
    163 	return datalen;
    164 }
    165 
    166 int
    167 getaf(prop_dictionary_t env)
    168 {
    169 	int64_t af;
    170 
    171 	if (!prop_dictionary_get_int64(env, "af", &af)) {
    172 		errno = ENOENT;
    173 		return -1;
    174 	}
    175 	return (int)af;
    176 }
    177