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 
27 #include <sys/ioctl.h>
28 
29 #include <net/if.h>
30 
31 #include <errno.h>
32 #include <ifaddrs.h>
33 #include <stdio.h>
34 #include <stdlib.h>
35 #include <unistd.h>
36 
37 #include "libifconfig.h" // Needed for ifconfig_errstate
38 #include "libifconfig_internal.h"
39 
40 int
41 ifconfig_getifaddrs(ifconfig_handle_t *h)
42 {
43 	int ret;
44 
45 	if (h->ifap == NULL) {
46 		ret = getifaddrs(&h->ifap);
47 		return (ret);
48 	} else {
49 		return (0);
50 	}
51 }
52 
53 int
54 ifconfig_ioctlwrap(ifconfig_handle_t *h, const int addressfamily,
55     unsigned long request, void *data)
56 {
57 	int s;
58 
59 	if (ifconfig_socket(h, addressfamily, &s) != 0) {
60 		return (-1);
61 	}
62 
63 	if (ioctl(s, request, data) != 0) {
64 		h->error.errtype = IOCTL;
65 		h->error.ioctl_request = request;
66 		h->error.errcode = errno;
67 		return (-1);
68 	}
69 
70 	return (0);
71 }
72 
73 /*
74  * Function to get socket for the specified address family.
75  * If the socket doesn't already exist, attempt to create it.
76  */
77 int
78 ifconfig_socket(ifconfig_handle_t *h, const int addressfamily, int *s)
79 {
80 
81 	if (addressfamily > AF_MAX) {
82 		h->error.errtype = SOCKET;
83 		h->error.errcode = EINVAL;
84 		return (-1);
85 	}
86 
87 	if (h->sockets[addressfamily] != -1) {
88 		*s = h->sockets[addressfamily];
89 		return (0);
90 	}
91 
92 	/* We don't have a socket of that type available. Create one. */
93 	h->sockets[addressfamily] = socket(addressfamily, SOCK_DGRAM, 0);
94 	if (h->sockets[addressfamily] == -1) {
95 		h->error.errtype = SOCKET;
96 		h->error.errcode = errno;
97 		return (-1);
98 	}
99 
100 	*s = h->sockets[addressfamily];
101 	return (0);
102 }
103 
104 void
105 ifconfig_error_clear(ifconfig_handle_t *h)
106 {
107 	h->error.errtype = OK;
108 	h->error.errcode = 0;
109 }
110 
111 void
112 ifconfig_error(ifconfig_handle_t *h, ifconfig_errtype type, int error)
113 {
114 	h->error.errtype = type;
115 	h->error.errcode = error;
116 }
117