[BZ #381]

Update.
	* sunrpc/clnt_udp.c (is_network_up): Use getifaddrs instead of ioctl.
	* sunrpc/get_myaddr.c (get_myaddress): Likewise.
	* sunrpc/pmap_clnt.c (__get_myaddress): Likewise.
	* sunrpc/pmap_rmt.c (getbroadcastnets): Likewise.  Change interface
	to avoid buffer overrun and remove now useless parameters.
	(clnt_broadcast): Adjust caller.  [BZ #381].

4 files changed, 83 insertions, 126 deletions

diff --git a/sunrpc/clnt_udp.c b/sunrpc/clnt_udp.c
index f906173363..1836ff3433 100644
--- a/sunrpc/clnt_udp.c
+++ b/sunrpc/clnt_udp.c
@@ -50,6 +50,7 @@ static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro";
 #include <errno.h>
 #include <rpc/pmap_clnt.h>
 #include <net/if.h>
+#include <ifaddrs.h>
 #ifdef USE_IN_LIBIO
 # include <wchar.h>
 #endif
@@ -234,28 +235,24 @@ INTDEF (clntudp_create)
 static int
 is_network_up (int sock)
 {
-  struct ifconf ifc;
-  char buf[UDPMSGSIZE];
-  struct ifreq ifreq, *ifr;
-  int n;
-
-  ifc.ifc_len = sizeof (buf);
-  ifc.ifc_buf = buf;
-  if (__ioctl(sock, SIOCGIFCONF, (char *) &ifc) == 0)
+  struct ifaddrs *ifa;
+
+  if (getifaddrs (&ifa) != 0)
+    return 0;
+
+  struct ifaddrs *run = ifa;
+  while (run != NULL)
     {
-      ifr = ifc.ifc_req;
-      for (n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
-	{
-	  ifreq = *ifr;
-	  if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
-	    break;
+      if ((run->ifa_flags & IFF_UP) != 0
+	  && run->ifa_addr->sa_family == AF_INET)
+	break;
 
-	  if ((ifreq.ifr_flags & IFF_UP)
-	      && ifr->ifr_addr.sa_family == AF_INET)
-	    return 1;
-	}
+      run = run->ifa_next;
     }
-  return 0;
+
+  freeifaddrs (ifa);
+
+  return run != NULL;
 }
 
 static enum clnt_stat
diff --git a/sunrpc/get_myaddr.c b/sunrpc/get_myaddr.c
index 7a4bb8cb6f..ee822970f9 100644
--- a/sunrpc/get_myaddr.c
+++ b/sunrpc/get_myaddr.c
@@ -46,6 +46,7 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
 #include <unistd.h>
 #include <libintl.h>
 #include <net/if.h>
+#include <ifaddrs.h>
 #include <sys/ioctl.h>
 /* Order of following two #includes reversed by roland@gnu */
 #include <netinet/in.h>
@@ -60,50 +61,42 @@ static char sccsid[] = "@(#)get_myaddress.c 1.4 87/08/11 Copyr 1984 Sun Micro";
 void
 get_myaddress (struct sockaddr_in *addr)
 {
-  int s;
-  char buf[BUFSIZ];
-  struct ifconf ifc;
-  struct ifreq ifreq, *ifr;
-  int len, loopback = 0;
+  struct ifaddrs *ifa;
 
-  if ((s = __socket (AF_INET, SOCK_DGRAM, 0)) < 0)
+  if (getifaddrs (&ifa) == 0)
     {
-      perror ("get_myaddress: socket");
-      exit (1);
-    }
-  ifc.ifc_len = sizeof (buf);
-  ifc.ifc_buf = buf;
-  if (__ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)
-    {
-      perror (_("get_myaddress: ioctl (get interface configuration)"));
+      perror ("get_myaddress: getifaddrs");
       exit (1);
     }
 
+  int loopback = 0;
+  struct ifaddrs *run;
+
  again:
-  ifr = ifc.ifc_req;
-  for (len = ifc.ifc_len; len; len -= sizeof ifreq)
+  run = ifa;
+  while (run != NULL)
     {
-      ifreq = *ifr;
-      if (__ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
+      if ((run->ifa_flags & IFF_UP) && run->ifa_addr->sa_family == AF_INET
+	  && (!(run->ifa_flags & IFF_LOOPBACK)
+	      || (loopback == 1 && (run->ifa_flags & IFF_LOOPBACK))))
 	{
-          perror ("get_myaddress: ioctl");
-          exit (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))))
-	{
-	  *addr = *((struct sockaddr_in *) &ifr->ifr_addr);
+	  *addr = *((struct sockaddr_in *) run->ifa_addr);
 	  addr->sin_port = htons (PMAPPORT);
-	  __close (s);
-	  return;
+	  goto out;
 	}
-      ifr++;
+
+      run = run->ifa_next;
     }
+
   if (loopback == 0)
     {
       loopback = 1;
       goto again;
     }
-  __close (s);
+ out:
+  freeifaddrs (ifa);
+
+  /* The function is horribly specified.  It does not return any error
+     if no interface is up.  Probably this won't happen (at least
+     loopback is there) but still...  */
 }
diff --git a/sunrpc/pmap_clnt.c b/sunrpc/pmap_clnt.c
index d88487d8f4..c968511e96 100644
--- a/sunrpc/pmap_clnt.c
+++ b/sunrpc/pmap_clnt.c
@@ -38,6 +38,7 @@
 #include <unistd.h>
 #include <libintl.h>
 #include <net/if.h>
+#include <ifaddrs.h>
 #include <sys/ioctl.h>
 #include <sys/socket.h>
 #include <netinet/in.h>
@@ -54,52 +55,41 @@
 static bool_t
 __get_myaddress (struct sockaddr_in *addr)
 {
-  int s;
-  char buf[BUFSIZ];
-  struct ifconf ifc;
-  struct ifreq ifreq, *ifr;
-  int len, loopback = 1;
+  struct ifaddrs *ifa;
 
-  if ((s = __socket (AF_INET, SOCK_DGRAM, 0)) < 0)
+  if (getifaddrs (&ifa) == 0)
     {
-      perror ("__get_myaddress: socket");
-      exit (1);
-    }
-  ifc.ifc_len = sizeof (buf);
-  ifc.ifc_buf = buf;
-  if (__ioctl (s, SIOCGIFCONF, (char *) &ifc) < 0)
-    {
-      perror (_("__get_myaddress: ioctl (get interface configuration)"));
+      perror ("get_myaddress: getifaddrs");
       exit (1);
     }
 
+  int loopback = 1;
+  struct ifaddrs *run;
+
  again:
-  ifr = ifc.ifc_req;
-  for (len = ifc.ifc_len; len; len -= sizeof ifreq)
+  run = ifa;
+  while (run != NULL)
     {
-      ifreq = *ifr;
-      if (__ioctl (s, SIOCGIFFLAGS, (char *) &ifreq) < 0)
-        {
-          perror ("__get_myaddress: ioctl");
-          exit (1);
-        }
-      if ((ifreq.ifr_flags & IFF_UP) && (ifr->ifr_addr.sa_family == AF_INET)
-          && ((ifreq.ifr_flags & IFF_LOOPBACK) || (loopback == 0)))
-        {
-          *addr = *((struct sockaddr_in *) &ifr->ifr_addr);
-          addr->sin_port = htons (PMAPPORT);
-          __close (s);
-          return TRUE;
-        }
-      ifr++;
+      if ((run->ifa_flags & IFF_UP) && run->ifa_addr->sa_family == AF_INET
+	  && ((run->ifa_flags & IFF_LOOPBACK) || loopback == 0))
+	{
+	  *addr = *((struct sockaddr_in *) run->ifa_addr);
+	  addr->sin_port = htons (PMAPPORT);
+	  goto out;
+	}
+
+      run = run->ifa_next;
     }
+
   if (loopback == 1)
     {
       loopback = 0;
       goto again;
     }
-  __close (s);
-  return FALSE;
+ out:
+  freeifaddrs (ifa);
+
+  return run == NULL ? FALSE : TRUE;
 }
 
 
diff --git a/sunrpc/pmap_rmt.c b/sunrpc/pmap_rmt.c
index c02f546b36..e446f5e608 100644
--- a/sunrpc/pmap_rmt.c
+++ b/sunrpc/pmap_rmt.c
@@ -53,6 +53,7 @@ static char sccsid[] = "@(#)pmap_rmt.c 1.21 87/08/27 Copyr 1984 Sun Micro";
 #undef	 _POSIX_SOURCE		/* Ultrix <sys/param.h> needs --roland@gnu */
 #include <sys/param.h>		/* Ultrix needs before net/if --roland@gnu */
 #include <net/if.h>
+#include <ifaddrs.h>
 #include <sys/ioctl.h>
 #include <arpa/inet.h>
 #define MAX_BROADCAST_SIZE 1400
@@ -174,55 +175,31 @@ INTDEF(xdr_rmtcallres)
 
 static int
 internal_function
-getbroadcastnets (struct in_addr *addrs, int sock, char *buf)
-  /* int sock:  any valid socket will do */
-  /* char *buf:	why allocate more when we can use existing... */
+getbroadcastnets (struct in_addr *addrs, int naddrs)
 {
-  struct ifconf ifc;
-  struct ifreq ifreq, *ifr;
-  struct sockaddr_in *sin;
-  int n, i;
+  struct ifaddrs *ifa;
 
-  ifc.ifc_len = UDPMSGSIZE;
-  ifc.ifc_buf = buf;
-  if (__ioctl (sock, SIOCGIFCONF, (char *) &ifc) < 0)
+  if (getifaddrs (&ifa) == 0)
     {
-      perror (_("broadcast: ioctl (get interface configuration)"));
-      return (0);
+      perror ("broadcast: getifaddrs");
+      return 0;
     }
-  ifr = ifc.ifc_req;
-  for (i = 0, n = ifc.ifc_len / sizeof (struct ifreq); n > 0; n--, ifr++)
+
+  int i = 0;
+  struct ifaddrs *run = ifa;
+  while (run != NULL && i < naddrs)
     {
-      ifreq = *ifr;
-      if (__ioctl (sock, SIOCGIFFLAGS, (char *) &ifreq) < 0)
-	{
-	  perror (_("broadcast: ioctl (get interface flags)"));
-	  continue;
-	}
-      if ((ifreq.ifr_flags & IFF_BROADCAST) &&
-	  (ifreq.ifr_flags & IFF_UP) &&
-	  ifr->ifr_addr.sa_family == AF_INET)
-	{
-	  sin = (struct sockaddr_in *) &ifr->ifr_addr;
-#ifdef SIOCGIFBRDADDR		/* 4.3BSD */
-	  if (__ioctl (sock, SIOCGIFBRDADDR, (char *) &ifreq) < 0)
-	    {
-	      addrs[i++] = inet_makeaddr (inet_netof
-	      /* Changed to pass struct instead of s_addr member
-	         by roland@gnu.  */
-					  (sin->sin_addr), INADDR_ANY);
-	    }
-	  else
-	    {
-	      addrs[i++] = ((struct sockaddr_in *)
-			    &ifreq.ifr_addr)->sin_addr;
-	    }
-#else /* 4.2 BSD */
-	  addrs[i++] = inet_makeaddr (inet_netof
-				      (sin->sin_addr.s_addr), INADDR_ANY);
-#endif
-	}
+      if ((run->ifa_flags & IFF_BROADCAST) != 0
+	  && (run->ifa_flags & IFF_UP) != 0
+	  && run->ifa_addr->sa_family == AF_INET)
+	/* Copy the broadcast address.  */
+	addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr;
+
+      run = run->ifa_next;
     }
+
+  freeifaddrs (ifa);
+
   return i;
 }
 
@@ -280,7 +257,7 @@ clnt_broadcast (prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult)
 #endif /* def SO_BROADCAST */
   fd.fd = sock;
   fd.events = POLLIN;
-  nets = getbroadcastnets (addrs, sock, inbuf);
+  nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0]));
   __bzero ((char *) &baddr, sizeof (baddr));
   baddr.sin_family = AF_INET;
   baddr.sin_port = htons (PMAPPORT);