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Commit | Line | Data |
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28f540f4 | 1 | /* |
a7ab6ec8 | 2 | * get_myaddress.c |
ab09b221 | 3 | * |
a7ab6ec8 UD |
4 | * Get client's IP address via ioctl. This avoids using the yellowpages. |
5 | * Copyright (c) 2010, Oracle America, Inc. | |
ab09b221 | 6 | * |
a7ab6ec8 UD |
7 | * Redistribution and use in source and binary forms, with or without |
8 | * modification, are permitted provided that the following conditions are | |
9 | * met: | |
ab09b221 | 10 | * |
a7ab6ec8 UD |
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. | |
cb636bb2 | 20 | * |
a7ab6ec8 UD |
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. | |
28f540f4 RM |
33 | */ |
34 | ||
35 | #include <rpc/types.h> | |
af6f3906 | 36 | #include <rpc/clnt.h> |
28f540f4 RM |
37 | #include <rpc/pmap_prot.h> |
38 | #include <sys/socket.h> | |
39 | #include <stdio.h> | |
650425ce | 40 | #include <unistd.h> |
4360eafd | 41 | #include <libintl.h> |
28f540f4 | 42 | #include <net/if.h> |
412c954a | 43 | #include <ifaddrs.h> |
28f540f4 RM |
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 | ||
cbd3dceb | 49 | /* |
28f540f4 | 50 | * don't use gethostbyname, which would invoke yellow pages |
650425ce UD |
51 | * |
52 | * Avoid loopback interfaces. We return information from a loopback | |
53 | * interface only if there are no other possible interfaces. | |
28f540f4 | 54 | */ |
e7fd8a39 UD |
55 | void |
56 | get_myaddress (struct sockaddr_in *addr) | |
28f540f4 | 57 | { |
412c954a | 58 | struct ifaddrs *ifa; |
28f540f4 | 59 | |
21ae57c4 | 60 | if (getifaddrs (&ifa) != 0) |
e7fd8a39 | 61 | { |
412c954a | 62 | perror ("get_myaddress: getifaddrs"); |
e7fd8a39 UD |
63 | exit (1); |
64 | } | |
650425ce | 65 | |
412c954a UD |
66 | int loopback = 0; |
67 | struct ifaddrs *run; | |
68 | ||
650425ce | 69 | again: |
412c954a UD |
70 | run = ifa; |
71 | while (run != NULL) | |
e7fd8a39 | 72 | { |
f7e7a396 UD |
73 | if ((run->ifa_flags & IFF_UP) |
74 | && run->ifa_addr != NULL | |
75 | && run->ifa_addr->sa_family == AF_INET | |
412c954a UD |
76 | && (!(run->ifa_flags & IFF_LOOPBACK) |
77 | || (loopback == 1 && (run->ifa_flags & IFF_LOOPBACK)))) | |
e7fd8a39 | 78 | { |
412c954a | 79 | *addr = *((struct sockaddr_in *) run->ifa_addr); |
e7fd8a39 | 80 | addr->sin_port = htons (PMAPPORT); |
412c954a | 81 | goto out; |
28f540f4 | 82 | } |
412c954a UD |
83 | |
84 | run = run->ifa_next; | |
e7fd8a39 | 85 | } |
412c954a | 86 | |
650425ce UD |
87 | if (loopback == 0) |
88 | { | |
89 | loopback = 1; | |
90 | goto again; | |
91 | } | |
412c954a UD |
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... */ | |
28f540f4 | 98 | } |
7b57bfe5 UD |
99 | #ifdef EXPORT_RPC_SYMBOLS |
100 | libc_hidden_def (get_myaddress) | |
101 | #else | |
102 | libc_hidden_nolink (get_myaddress, GLIBC_2_0) | |
103 | #endif |