* inet/test-ifaddrs.c (main: addr_string): Handle null SA.

	Grok AF_LINK if defined.
	From Momchil Velikov <velco@fadata.bg>.

	* sysdeps/gnu/ifaddrs.c (getifaddrs): If ioctl fails for netmask,
	brdaddr, or dstaddr, just set those pointers to null and don't fail.
	Reported by Momchil Velikov <velco@fadata.bg>.

	* sysdeps/generic/ifreq.h (__if_nextreq) [_HAVE_SA_LEN]: If sa_len
	is > sizeof IFR->ifa_addr, advance past the whole longer length.
	(__ifreq): Count up NIFS that way too.
	Reported by Momchil Velikov <velco@fadata.bg>.

	* sysdeps/mach/hurd/lchmod.c: Include <fcntl.h>.

2 files changed, 42 insertions, 20 deletions

diff --git a/sysdeps/generic/ifreq.h b/sysdeps/generic/ifreq.h
index 0d975be61c..4871c8d1d8 100644
--- a/sysdeps/generic/ifreq.h
+++ b/sysdeps/generic/ifreq.h
@@ -24,6 +24,15 @@
 #include <sys/socket.h>
 #include <sys/ioctl.h>
 
+static inline struct ifreq *
+__if_nextreq (struct ifreq *ifr)
+{
+#ifdef _HAVE_SA_LEN
+  if (ifr->ifa_addr > sizeof ifr->ifa_addr)
+    return (struct ifreq *) ((char *) &ifr->ifa_addr + ifr->ifa_addr.sa_len);
+#endif
+  return ifr + 1;
+}
 
 static inline void
 __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
@@ -63,23 +72,28 @@ __ifreq (struct ifreq **ifreqs, int *num_ifs, int sockfd)
     }
   while (rq_len < sizeof (struct ifreq) + ifc.ifc_len);
 
-  nifs = ifc.ifc_len / sizeof (struct ifreq);
-
   if (fd != sockfd)
     __close (fd);
 
+#ifdef _HAVE_SA_LEN
+  struct ifreq *ifr = ifreqs;
+  nifs = 0;
+  while ((char *) ifr < ifc.ifc_buf + ifc.ifc_len)
+    {
+      ++nifs;
+      ifr = __if_nextreq (ifr);
+      if (ifr == NULL)
+	break;
+    }
+#else
+  nifs = ifc.ifc_len / sizeof (struct ifreq);
+#endif
+
   *num_ifs = nifs;
   *ifreqs = realloc (ifc.ifc_buf, nifs * sizeof (struct ifreq));
 }
 
 
-static inline struct ifreq *
-__if_nextreq (struct ifreq *ifr)
-{
-  return ifr + 1;
-}
-
-
 static inline void
 __if_freereq (struct ifreq *ifreqs, int num_ifs)
 {
diff --git a/sysdeps/gnu/ifaddrs.c b/sysdeps/gnu/ifaddrs.c
index 0c1ae5bf05..6ecc457e50 100644
--- a/sysdeps/gnu/ifaddrs.c
+++ b/sysdeps/gnu/ifaddrs.c
@@ -79,11 +79,9 @@ getifaddrs (struct ifaddrs **ifap)
       ifr = ifreqs;
       do
 	{
-	  /* Fill in all pointers to the storage we've already allocated.  */
+	  /* Fill in pointers to the storage we've already allocated.  */
 	  storage[i].ia.ifa_next = &storage[i + 1].ia;
 	  storage[i].ia.ifa_addr = &storage[i].addr;
-	  storage[i].ia.ifa_netmask = &storage[i].netmask;
-	  storage[i].ia.ifa_broadaddr = &storage[i].broadaddr; /* & dstaddr */
 
 	  /* Now copy the information we already have from SIOCGIFCONF.  */
 	  storage[i].ia.ifa_name = strncpy (storage[i].name, ifr->ifr_name,
@@ -100,26 +98,36 @@ getifaddrs (struct ifaddrs **ifap)
 	  ifr->ifr_addr = storage[i].addr;
 
 	  if (__ioctl (fd, SIOCGIFNETMASK, ifr) < 0)
-	    break;
-	  storage[i].netmask = ifr->ifr_netmask;
+	    storage[i].ia.ifa_netmask = NULL;
+	  else
+	    {
+	      storage[i].ia.ifa_netmask = &storage[i].netmask;
+	      storage[i].netmask = ifr->ifr_netmask;
+	    }
 
 	  if (ifr->ifr_flags & IFF_BROADCAST)
 	    {
 	      ifr->ifr_addr = storage[i].addr;
 	      if (__ioctl (fd, SIOCGIFBRDADDR, ifr) < 0)
-		break;
-	      storage[i].broadaddr = ifr->ifr_broadaddr;
+		storage[i].ia.ifa_broadaddr = NULL;
+	      {
+		storage[i].ia.ifa_broadaddr = &storage[i].broadaddr;
+		storage[i].broadaddr = ifr->ifr_broadaddr;
+	      }
 	    }
 	  else if (ifr->ifr_flags & IFF_POINTOPOINT)
 	    {
 	      ifr->ifr_addr = storage[i].addr;
 	      if (__ioctl (fd, SIOCGIFDSTADDR, ifr) < 0)
-		break;
-	      storage[i].broadaddr = ifr->ifr_dstaddr;
+		storage[i].ia.ifa_broadaddr = NULL;
+	      else
+		{
+		  storage[i].ia.ifa_broadaddr = &storage[i].broadaddr;
+		  storage[i].broadaddr = ifr->ifr_dstaddr;
+		}
 	    }
 	  else
-	    /* Just 'cause.  */
-	    memset (&storage[i].broadaddr, 0, sizeof storage[i].broadaddr);
+	    storage[i].ia.ifa_broadaddr = NULL;
 
 	  storage[i].ia.ifa_data = NULL; /* Nothing here for now.  */