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[/] [openrisc/] [trunk/] [rtos/] [rtems/] [c/] [src/] [librpc/] [src/] [rpc/] [get_myaddress.c] - Rev 173
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/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ #if defined(LIBC_SCCS) && !defined(lint) /*static char *sccsid = "from: @(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";*/ /*static char *sccsid = "from: @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC";*/ static char *rcsid = "$FreeBSD: src/lib/libc/rpc/get_myaddress.c,v 1.17 2000/01/27 23:06:37 jasone Exp $"; #endif /* * get_myaddress.c * * Get client's IP address via ioctl. This avoids using the yellowpages. * Copyright (C) 1984, Sun Microsystems, Inc. */ #include <rpc/types.h> #include <rpc/xdr.h> #include <rpc/pmap_prot.h> #include <sys/socket.h> #include <stdio.h> #include <unistd.h> #include <net/if.h> #include <sys/ioctl.h> #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. */ int get_myaddress(addr) struct sockaddr_in *addr; { int s; char buf[BUFSIZ]; struct ifconf ifc; struct ifreq ifreq, *ifr, *end; int loopback = 0, gotit = 0; if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { return(-1); } ifc.ifc_len = sizeof (buf); ifc.ifc_buf = buf; if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { _close(s); return(-1); } again: ifr = ifc.ifc_req; end = (struct ifreq *) (ifc.ifc_buf + ifc.ifc_len); while (ifr < end) { ifreq = *ifr; if (ioctl(s, SIOCGIFFLAGS, (char *)&ifreq) < 0) { _close(s); return(-1); } if (((ifreq.ifr_flags & IFF_UP) && ifr->ifr_addr.sa_family == AF_INET && !(ifreq.ifr_flags & IFF_LOOPBACK)) || (loopback == 1 && (ifreq.ifr_flags & IFF_LOOPBACK) && (ifr->ifr_addr.sa_family == AF_INET) && (ifreq.ifr_flags & IFF_UP))) { *addr = *((struct sockaddr_in *)&ifr->ifr_addr); addr->sin_port = htons(PMAPPORT); gotit = 1; break; } if (ifr->ifr_addr.sa_len) ifr = (struct ifreq *) ((caddr_t) ifr + ifr->ifr_addr.sa_len - sizeof(struct sockaddr)); ifr++; } if (gotit == 0 && loopback == 0) { loopback = 1; goto again; } (void)_close(s); return (gotit ? 0 : -1); }