1 /*
2 * CDDL HEADER START
3 *
4 * The contents of this file are subject to the terms of the
5 * Common Development and Distribution License (the "License").
6 * You may not use this file except in compliance with the License.
7 *
8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9 * or http://www.opensolaris.org/os/licensing.
10 * See the License for the specific language governing permissions
11 * and limitations under the License.
12 *
13 * When distributing Covered Code, include this CDDL HEADER in each
14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15 * If applicable, add the following below this CDDL HEADER, with the
16 * fields enclosed by brackets "[]" replaced with your own identifying
17 * information: Portions Copyright [yyyy] [name of copyright owner]
18 *
19 * CDDL HEADER END
20 *
21 * Copyright 2009 Sun Microsystems, Inc. All rights reserved.
22 * Use is subject to license terms.
23 */
24
25 #include <errno.h>
26 #include <libinetutil.h>
27 #include <stdio.h>
28 #include <stdlib.h>
29 #include <string.h>
30 #include <unistd.h>
31 #include <sys/socket.h>
32 #include <sys/sockio.h>
33
34 /*
35 * Create a list of the addresses on physical interface `ifname' with at least
36 * one of the flags in `set' set and all of the flags in `clear' clear.
37 * Return the number of items in the list, or -1 on failure.
38 */
39 int
ifaddrlistx(const char * ifname,uint64_t set,uint64_t clear,ifaddrlistx_t ** ifaddrsp)40 ifaddrlistx(const char *ifname, uint64_t set, uint64_t clear,
41 ifaddrlistx_t **ifaddrsp)
42 {
43 struct lifconf lifc;
44 struct lifnum lifn;
45 struct lifreq *lifrp;
46 ifaddrlistx_t *ifaddrp, *ifaddrs = NULL;
47 int i, nlifr, naddr = 0;
48 char *cp;
49 uint_t flags;
50 int s4, s6 = -1;
51 boolean_t isv6;
52 int save_errno;
53 struct sockaddr_storage addr;
54
55 (void) memset(&lifc, 0, sizeof (lifc));
56 flags = LIFC_NOXMIT | LIFC_ALLZONES | LIFC_TEMPORARY | LIFC_UNDER_IPMP;
57
58 /*
59 * We need both IPv4 and IPv6 sockets to query both IPv4 and IPv6
60 * interfaces below.
61 */
62 if ((s4 = socket(AF_INET, SOCK_DGRAM, 0)) == -1 ||
63 (s6 = socket(AF_INET6, SOCK_DGRAM, 0)) == -1) {
64 goto fail;
65 }
66
67 /*
68 * Get the number of network interfaces of type `family'.
69 */
70 lifn.lifn_family = AF_UNSPEC;
71 lifn.lifn_flags = flags;
72 again:
73 if (ioctl(s4, SIOCGLIFNUM, &lifn) == -1)
74 goto fail;
75
76 /*
77 * Pad the interface count to detect when additional interfaces have
78 * been configured between SIOCGLIFNUM and SIOCGLIFCONF.
79 */
80 lifn.lifn_count += 4;
81
82 lifc.lifc_flags = flags;
83 lifc.lifc_family = AF_UNSPEC;
84 lifc.lifc_len = lifn.lifn_count * sizeof (struct lifreq);
85 if ((lifc.lifc_buf = realloc(lifc.lifc_buf, lifc.lifc_len)) == NULL)
86 goto fail;
87
88 if (ioctl(s4, SIOCGLIFCONF, &lifc) == -1)
89 goto fail;
90
91 /*
92 * If every lifr_req slot is taken, then additional interfaces must
93 * have been plumbed between the SIOCGLIFNUM and the SIOCGLIFCONF.
94 * Recalculate to make sure we didn't miss any interfaces.
95 */
96 nlifr = lifc.lifc_len / sizeof (struct lifreq);
97 if (nlifr >= lifn.lifn_count)
98 goto again;
99
100 /*
101 * Populate the ifaddrlistx by querying each matching interface. If a
102 * query ioctl returns ENXIO, then the interface must have been
103 * removed after the SIOCGLIFCONF completed -- so we just ignore it.
104 */
105 for (lifrp = lifc.lifc_req, i = 0; i < nlifr; i++, lifrp++) {
106 if ((cp = strchr(lifrp->lifr_name, ':')) != NULL)
107 *cp = '\0';
108
109 if (strcmp(lifrp->lifr_name, ifname) != 0)
110 continue;
111
112 if (cp != NULL)
113 *cp = ':';
114
115 addr = lifrp->lifr_addr;
116 isv6 = addr.ss_family == AF_INET6;
117 if (ioctl(isv6 ? s6 : s4, SIOCGLIFFLAGS, lifrp) == -1) {
118 if (errno == ENXIO)
119 continue;
120 goto fail;
121 }
122
123 if (set != 0 && ((lifrp->lifr_flags & set) == 0) ||
124 (lifrp->lifr_flags & clear) != 0)
125 continue;
126
127 /*
128 * We've got a match; allocate a new record.
129 */
130 if ((ifaddrp = malloc(sizeof (ifaddrlistx_t))) == NULL)
131 goto fail;
132
133 (void) strlcpy(ifaddrp->ia_name, lifrp->lifr_name, LIFNAMSIZ);
134 ifaddrp->ia_flags = lifrp->lifr_flags;
135 ifaddrp->ia_addr = addr;
136 ifaddrp->ia_next = ifaddrs;
137 ifaddrs = ifaddrp;
138 naddr++;
139 }
140
141 (void) close(s4);
142 (void) close(s6);
143 free(lifc.lifc_buf);
144 *ifaddrsp = ifaddrs;
145 return (naddr);
146 fail:
147 save_errno = errno;
148 (void) close(s4);
149 (void) close(s6);
150 free(lifc.lifc_buf);
151 ifaddrlistx_free(ifaddrs);
152 errno = save_errno;
153 return (-1);
154 }
155
156 /*
157 * Free the provided ifaddrlistx_t.
158 */
159 void
ifaddrlistx_free(ifaddrlistx_t * ifaddrp)160 ifaddrlistx_free(ifaddrlistx_t *ifaddrp)
161 {
162 ifaddrlistx_t *next_ifaddrp;
163
164 for (; ifaddrp != NULL; ifaddrp = next_ifaddrp) {
165 next_ifaddrp = ifaddrp->ia_next;
166 free(ifaddrp);
167 }
168 }
169