netstat: fix handling of large socket numbers

The kernel really only treats sockets with a value of -1 as an error.
The rest are an unsigned quantity.  So tweak the nestat lookup to use
an unsigned value.

patch based on Antonio Galea's work in Debian bug 345331

netstat.c

@@ -6,7 +6,7 @@
  *              NET-3 Networking Distribution for the LINUX operating
  *              system.
  *
- * Version:     $Id: netstat.c,v 1.70 2010-08-15 16:09:31 vapier Exp $
+ * Version:     $Id: netstat.c,v 1.71 2011-04-09 13:52:05 vapier Exp $
  *
  * Authors:     Fred Baumgarten, <dc6iq@insu1.etec.uni-karlsruhe.de>
  *              Fred N. van Kempen, <waltje@uwalt.nl.mugnet.org>
@@ -326,8 +326,8 @@ static int extract_type_1_socket_inode(const char lname[], unsigned long * inode
 
         strncpy(inode_str, lname+PRG_SOCKET_PFXl, inode_str_len);
         inode_str[inode_str_len] = '\0';
-        *inode_p = strtol(inode_str,&serr,0);
-        if (!serr || *serr || *inode_p < 0 || *inode_p >= LONG_MAX) 
+        *inode_p = strtoul(inode_str, &serr, 0);
+        if (!serr || *serr || *inode_p == ~0)
             return(-1);
     }
     return(0);
@@ -347,8 +347,8 @@ static int extract_type_2_socket_inode(const char lname[], unsigned long * inode
     {
         char *serr;
 
-        *inode_p=strtol(lname + PRG_SOCKET_PFX2l,&serr,0);
-        if (!serr || *serr || *inode_p < 0 || *inode_p >= LONG_MAX) 
+        *inode_p = strtoul(lname + PRG_SOCKET_PFX2l, &serr, 0);
+        if (!serr || *serr || *inode_p == ~0)
             return(-1);
     }
     return(0);