| lh | 9ed821d | 2023-04-07 01:36:19 -0700 | [diff] [blame] | 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 |