diff options
Diffstat (limited to 'lib/libc/rpc/get_myaddress.c')
| -rw-r--r-- | lib/libc/rpc/get_myaddress.c | 112 |
1 files changed, 112 insertions, 0 deletions
diff --git a/lib/libc/rpc/get_myaddress.c b/lib/libc/rpc/get_myaddress.c new file mode 100644 index 0000000..a18a032 --- /dev/null +++ b/lib/libc/rpc/get_myaddress.c @@ -0,0 +1,112 @@ +/* + * 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 = "$FreeBSD$"; +#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); +} |
