1 | /* |
2 | * get_myaddress.c |
3 | * |
4 | * Get client's IP address via ioctl. This avoids using the yellowpages. |
5 | * Copyright (c) 2010, Oracle America, Inc. |
6 | * |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions are |
9 | * met: |
10 | * |
11 | * * Redistributions of source code must retain the above copyright |
12 | * notice, this list of conditions and the following disclaimer. |
13 | * * Redistributions in binary form must reproduce the above |
14 | * copyright notice, this list of conditions and the following |
15 | * disclaimer in the documentation and/or other materials |
16 | * provided with the distribution. |
17 | * * Neither the name of the "Oracle America, Inc." nor the names of its |
18 | * contributors may be used to endorse or promote products derived |
19 | * from this software without specific prior written permission. |
20 | * |
21 | * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
22 | * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
23 | * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
24 | * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
25 | * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
26 | * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
27 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
28 | * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
29 | * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
30 | * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
31 | * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
32 | * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
33 | */ |
34 | |
35 | #include <rpc/types.h> |
36 | #include <rpc/clnt.h> |
37 | #include <rpc/pmap_prot.h> |
38 | #include <sys/socket.h> |
39 | #include <stdio.h> |
40 | #include <unistd.h> |
41 | #include <libintl.h> |
42 | #include <net/if.h> |
43 | #include <ifaddrs.h> |
44 | #include <sys/ioctl.h> |
45 | /* Order of following two #includes reversed by roland@gnu */ |
46 | #include <netinet/in.h> |
47 | #include <arpa/inet.h> |
48 | |
49 | /* |
50 | * don't use gethostbyname, which would invoke yellow pages |
51 | * |
52 | * Avoid loopback interfaces. We return information from a loopback |
53 | * interface only if there are no other possible interfaces. |
54 | */ |
55 | void |
56 | get_myaddress (struct sockaddr_in *addr) |
57 | { |
58 | struct ifaddrs *ifa; |
59 | |
60 | if (getifaddrs (&ifa) != 0) |
61 | { |
62 | perror ("get_myaddress: getifaddrs" ); |
63 | exit (1); |
64 | } |
65 | |
66 | int loopback = 0; |
67 | struct ifaddrs *run; |
68 | |
69 | again: |
70 | run = ifa; |
71 | while (run != NULL) |
72 | { |
73 | if ((run->ifa_flags & IFF_UP) |
74 | && run->ifa_addr != NULL |
75 | && run->ifa_addr->sa_family == AF_INET |
76 | && (!(run->ifa_flags & IFF_LOOPBACK) |
77 | || (loopback == 1 && (run->ifa_flags & IFF_LOOPBACK)))) |
78 | { |
79 | *addr = *((struct sockaddr_in *) run->ifa_addr); |
80 | addr->sin_port = htons (PMAPPORT); |
81 | goto out; |
82 | } |
83 | |
84 | run = run->ifa_next; |
85 | } |
86 | |
87 | if (loopback == 0) |
88 | { |
89 | loopback = 1; |
90 | goto again; |
91 | } |
92 | out: |
93 | freeifaddrs (ifa); |
94 | |
95 | /* The function is horribly specified. It does not return any error |
96 | if no interface is up. Probably this won't happen (at least |
97 | loopback is there) but still... */ |
98 | } |
99 | #ifdef EXPORT_RPC_SYMBOLS |
100 | libc_hidden_def (get_myaddress) |
101 | #else |
102 | libc_hidden_nolink_sunrpc (get_myaddress, GLIBC_2_0) |
103 | #endif |
104 | |