diff options
Diffstat (limited to 'librpc/src/rpc/get_myaddress.c')
| -rw-r--r-- | librpc/src/rpc/get_myaddress.c | 143 |
1 files changed, 143 insertions, 0 deletions
diff --git a/librpc/src/rpc/get_myaddress.c b/librpc/src/rpc/get_myaddress.c new file mode 100644 index 0000000..a3410e9 --- /dev/null +++ b/librpc/src/rpc/get_myaddress.c @@ -0,0 +1,143 @@ +#include "rtems-rpc-config.h" + +/* + * 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. + */ + +#ifdef HAVE_CONFIG_H +#include "config.h" +#endif + +#include <rpc/types.h> +#include <rpc/xdr.h> +#include <rpc/pmap_prot.h> +#include <sys/socket.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <net/if.h> +#include <sys/ioctl.h> +#include <netinet/in.h> +#include <arpa/inet.h> + + +/* + * Determine the size of an ifreq structure when addresses larger + * than the pifreq structure size may be returned from the kernel. + */ +static size_t ifreqSize ( struct ifreq *pifreq ) +{ + size_t size = pifreq->ifr_addr.sa_len + sizeof(pifreq->ifr_name); + if ( size < sizeof ( *pifreq ) ) { + size = sizeof ( *pifreq ); + } + return size; +} + +/* + * 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( + struct sockaddr_in *addr) +{ + int s; + struct ifconf ifc; + struct ifreq ifreq, *ifr; + int loopback = 0, gotit = 0; + + if ((s = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { + return(-1); + } +again: + ifc.ifc_len = sizeof ( struct ifreq ) * 8u; + ifc.ifc_buf = malloc ( ifc.ifc_len ); + if ( ! ifc.ifc_buf ) { + _RPC_close(s); + return -1; + } + if (ioctl(s, SIOCGIFCONF, (char *)&ifc) < 0) { + _RPC_close(s); + free ( ifc.ifc_buf ); + return(-1); + } + ifr = ifc.ifc_req; + + while ( ifc.ifc_len >= ifreqSize ( ifr ) ) { + ifreq = *ifr; + if (ioctl(s, SIOCGIFFLAGS, (char *) &ifreq ) < 0) { + _RPC_close(s); + free ( ifc.ifc_buf ); + 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; + } + + const size_t len = ifreqSize ( ifr ); + ifc.ifc_len -= len; + /* + * RTEMS seems to require copy up to properly aligned + * boundary at the beginning of the buffer? + */ + memmove ( ifr, len + (char *) ifr, ifc.ifc_len ); + } + if (gotit == 0 && loopback == 0) { + free ( ifc.ifc_buf ); + loopback = 1; + goto again; + } + (void)_RPC_close(s); + free ( ifc.ifc_buf ); + return (gotit ? 0 : -1); +} |