| /* |
| * get_myaddress.c |
| * |
| * Get client's IP address via ioctl. This avoids using the yellowpages. |
| * Copyright (c) 2010, Oracle America, Inc. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions are |
| * met: |
| * |
| * * Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * * Redistributions in binary form must reproduce the above |
| * copyright notice, this list of conditions and the following |
| * disclaimer in the documentation and/or other materials |
| * provided with the distribution. |
| * * Neither the name of the "Oracle America, Inc." nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS |
| * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT |
| * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS |
| * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE |
| * COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, |
| * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE |
| * GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS |
| * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, |
| * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
| * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| #include <rpc/types.h> |
| #include <rpc/clnt.h> |
| #include <rpc/pmap_prot.h> |
| #include <sys/socket.h> |
| #include <stdio.h> |
| #include <unistd.h> |
| #include <libintl.h> |
| #include <net/if.h> |
| #include <ifaddrs.h> |
| #include <sys/ioctl.h> |
| /* Order of following two #includes reversed by roland@gnu */ |
| #include <netinet/in.h> |
| #include <arpa/inet.h> |
| |
| /* |
| * don't use gethostbyname, which would invoke yellow pages |
| * |
| * Avoid loopback interfaces. We return information from a loopback |
| * interface only if there are no other possible interfaces. |
| */ |
| void |
| get_myaddress (struct sockaddr_in *addr) |
| { |
| struct ifaddrs *ifa; |
| |
| if (getifaddrs (&ifa) != 0) |
| { |
| perror ("get_myaddress: getifaddrs"); |
| exit (1); |
| } |
| |
| int loopback = 0; |
| struct ifaddrs *run; |
| |
| again: |
| run = ifa; |
| while (run != NULL) |
| { |
| if ((run->ifa_flags & IFF_UP) |
| && run->ifa_addr != NULL |
| && run->ifa_addr->sa_family == AF_INET |
| && (!(run->ifa_flags & IFF_LOOPBACK) |
| || (loopback == 1 && (run->ifa_flags & IFF_LOOPBACK)))) |
| { |
| *addr = *((struct sockaddr_in *) run->ifa_addr); |
| addr->sin_port = htons (PMAPPORT); |
| goto out; |
| } |
| |
| run = run->ifa_next; |
| } |
| |
| if (loopback == 0) |
| { |
| loopback = 1; |
| goto again; |
| } |
| out: |
| freeifaddrs (ifa); |
| |
| /* The function is horribly specified. It does not return any error |
| if no interface is up. Probably this won't happen (at least |
| loopback is there) but still... */ |
| } |
| #ifdef EXPORT_RPC_SYMBOLS |
| libc_hidden_def (get_myaddress) |
| #else |
| libc_hidden_nolink_sunrpc (get_myaddress, GLIBC_2_0) |
| #endif |
