1 /*
2  * Copyright (c) 2016-2017, Marie Helene Kvello-Aune
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without modification,
6  * are permitted provided that the following conditions are met:
7  *
8  * 1. Redistributions of source code must retain the above copyright notice,
9  * thislist of conditions and the following disclaimer.
10  *
11  * 2. Redistributions in binary form must reproduce the above copyright notice,
12  * this list of conditions and the following disclaimer in the documentation and/or
13  * other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
16  * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
17  * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
18  * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER 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 OR
21  * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER
22  * CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
23  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
24  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  */
28 
29 #include <sys/ioctl.h>
30 
31 #include <net/if.h>
32 
33 #include <errno.h>
34 #include <ifaddrs.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <unistd.h>
38 
39 #include "libifconfig.h" // Needed for ifconfig_errstate
40 #include "libifconfig_internal.h"
41 
42 int
43 ifconfig_getifaddrs(ifconfig_handle_t *h)
44 {
45 	int ret;
46 
47 	if (h->ifap == NULL) {
48 		ret = getifaddrs(&h->ifap);
49 		return (ret);
50 	} else {
51 		return (0);
52 	}
53 }
54 
55 int
56 ifconfig_ioctlwrap(ifconfig_handle_t *h, const int addressfamily,
57     unsigned long request, void *data)
58 {
59 	int s;
60 
61 	if (ifconfig_socket(h, addressfamily, &s) != 0) {
62 		return (-1);
63 	}
64 
65 	if (ioctl(s, request, data) != 0) {
66 		h->error.errtype = IOCTL;
67 		h->error.ioctl_request = request;
68 		h->error.errcode = errno;
69 		return (-1);
70 	}
71 
72 	return (0);
73 }
74 
75 /*
76  * Function to get socket for the specified address family.
77  * If the socket doesn't already exist, attempt to create it.
78  */
79 int
80 ifconfig_socket(ifconfig_handle_t *h, const int addressfamily, int *s)
81 {
82 
83 	if (addressfamily > AF_MAX) {
84 		h->error.errtype = SOCKET;
85 		h->error.errcode = EINVAL;
86 		return (-1);
87 	}
88 
89 	if (h->sockets[addressfamily] != -1) {
90 		*s = h->sockets[addressfamily];
91 		return (0);
92 	}
93 
94 	/* We don't have a socket of that type available. Create one. */
95 	h->sockets[addressfamily] = socket(addressfamily, SOCK_DGRAM, 0);
96 	if (h->sockets[addressfamily] == -1) {
97 		h->error.errtype = SOCKET;
98 		h->error.errcode = errno;
99 		return (-1);
100 	}
101 
102 	*s = h->sockets[addressfamily];
103 	return (0);
104 }
105 
106 void
107 ifconfig_error_clear(ifconfig_handle_t *h)
108 {
109 	h->error.errtype = OK;
110 	h->error.errcode = 0;
111 }
112 
113 void
114 ifconfig_error(ifconfig_handle_t *h, ifconfig_errtype type, int error)
115 {
116 	h->error.errtype = type;
117 	h->error.errcode = error;
118 }
119