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