From 970a75edcf46aad1d973aad93c0e1e9d36278a57 Mon Sep 17 00:00:00 2001
From: david <david@e0a8ed71-7df4-0310-8962-fdc924857419>
Date: Fri, 23 Jan 2009 21:59:22 +0000
Subject: [PATCH] Display a warning if we can't read the first line (column
 headers) of /proc/net/route. This also silences a _FORTIFY_SOURCE warning.

---
 tcpip.cc | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/tcpip.cc b/tcpip.cc
index 4496a1b14..94d02ecb0 100644
--- a/tcpip.cc
+++ b/tcpip.cc
@@ -3019,7 +3019,16 @@ static struct sys_route *getsysroutes_proc(FILE *routefp, int *howmany) {
 
   ifaces = getinterfaces(&numifaces);
   routes = (struct sys_route *) safe_zalloc(route_capacity * sizeof(struct sys_route));
-  (void) fgets(buf, sizeof(buf), routefp); /* Kill the first line (column headers) */
+
+  /* Kill the first line (column headers) */
+  errno = 0;
+  if (fgets(buf, sizeof(buf), routefp) == NULL) {
+    if (errno)
+      error("Read error in /proc/net/route");
+    else
+      error("Premature EOF in /proc/net/route");
+    goto done;
+  }
   while(fgets(buf,sizeof(buf), routefp)) {
     p = strtok(buf, " \t\n");
     if (!p) {
@@ -3101,6 +3110,7 @@ static struct sys_route *getsysroutes_proc(FILE *routefp, int *howmany) {
     }
   }
 
+done:
   *howmany = numroutes;
   return routes;
 }