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/* $OpenBSD: get_myaddress.c,v 1.15 2015/09/13 15:36:56 guenther Exp $ */ |
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/* |
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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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/* |
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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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*/ |
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#include <rpc/types.h> |
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#include <rpc/xdr.h> |
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#include <rpc/pmap_prot.h> |
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#include <rpc/rpc.h> |
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#include <sys/socket.h> |
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#include <stdio.h> |
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#include <stdlib.h> |
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#include <unistd.h> |
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#include <net/if.h> |
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#include <netinet/in.h> |
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#include <ifaddrs.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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int |
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get_myaddress(struct sockaddr_in *addr) |
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{ |
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struct ifaddrs *ifap, *ifa; |
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int loopback = 0, gotit = 0; |
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if (getifaddrs(&ifap) != 0) |
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return (-1); |
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again: |
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for (ifa = ifap; ifa; ifa = ifa->ifa_next) { |
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if ((ifa->ifa_flags & IFF_UP) && |
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ifa->ifa_addr->sa_family == AF_INET && |
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(loopback == 1 && (ifa->ifa_flags & IFF_LOOPBACK))) { |
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*addr = *((struct sockaddr_in *)ifa->ifa_addr); |
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addr->sin_port = htons(PMAPPORT); |
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gotit = 1; |
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break; |
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} |
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} |
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if (gotit == 0 && loopback == 0) { |
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loopback = 1; |
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goto again; |
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} |
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freeifaddrs(ifap); |
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return (0); |
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} |
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DEF_WEAK(get_myaddress); |