diff options
Diffstat (limited to 'sunrpc/get_myaddr.c')
| -rw-r--r-- | sunrpc/get_myaddr.c | 32 |
1 files changed, 21 insertions, 11 deletions
diff --git a/sunrpc/get_myaddr.c b/sunrpc/get_myaddr.c index d45cb6d908..757fe06718 100644 --- a/sunrpc/get_myaddr.c +++ b/sunrpc/get_myaddr.c @@ -1,4 +1,4 @@ -/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */ +/* @(#)get_myaddress.c 2.1 88/07/29 4.0 RPCSRC */ /* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape @@ -38,13 +38,11 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro"; * Copyright (C) 1984, Sun Microsystems, Inc. */ -#include <unistd.h> #include <rpc/types.h> #include <rpc/pmap_prot.h> #include <sys/socket.h> #include <stdio.h> -#undef _POSIX_SOURCE /* Ultrix <sys/param.h> needs --roland@gnu */ -#include <sys/param.h> /* Ultrix needs before net/if --roland@gnu */ +#include <unistd.h> #include <net/if.h> #include <sys/ioctl.h> /* Order of following two #includes reversed by roland@gnu */ @@ -53,6 +51,9 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro"; /* * 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. */ void get_myaddress (struct sockaddr_in *addr) @@ -61,7 +62,7 @@ get_myaddress (struct sockaddr_in *addr) char buf[BUFSIZ]; struct ifconf ifc; struct ifreq ifreq, *ifr; - int len; + int len, loopback = 0; if ((s = socket (AF_INET, SOCK_DGRAM, 0)) < 0) { @@ -75,23 +76,32 @@ get_myaddress (struct sockaddr_in *addr) perror (_("get_myaddress: ioctl (get interface configuration)")); exit (1); } + + again: ifr = ifc.ifc_req; for (len = ifc.ifc_len; len; len -= sizeof ifreq) { ifreq = *ifr; if (ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0) { - perror ("get_myaddress: ioctl"); - exit (1); + perror ("get_myaddress: ioctl"); + exit (1); } - if ((ifreq.ifr_flags & IFF_UP) && - ifr->ifr_addr.sa_family == AF_INET) + 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)))) { *addr = *((struct sockaddr_in *) &ifr->ifr_addr); addr->sin_port = htons (PMAPPORT); - break; + close (s); + return; } ifr++; } - (void) close (s); + if (loopback == 0) + { + loopback = 1; + goto again; + } + close (s); } |