From 1166094a2f0e34ed5308f8729cbd7a637e64e5b1 Mon Sep 17 00:00:00 2001
From: Nick Hutchinson <nhutchinson@thousandeyes.com>
Date: Mon, 4 Jan 2021 11:41:32 +0000
Subject: [PATCH] Fix infinite loop when querying BSD routing table

Fix `query_route_table()` returning a buffer padded with extra '\0'
bytes because it ignored the buffer size returned by `sysctl()`.

This caused `route_entries()` / `route6_entries()` to fall into an
infinite loop, forever trying to parse a 0-length routing entry.
---
 src/utils/routing_utils.cpp | 1 +
 1 file changed, 1 insertion(+)

diff --git a/src/utils/routing_utils.cpp b/src/utils/routing_utils.cpp
index d107de8..191803e 100644
--- a/src/utils/routing_utils.cpp
+++ b/src/utils/routing_utils.cpp
@@ -154,6 +154,7 @@ vector<char> query_route_table(int family) {
         throw exception_base("sysctl failed");
     }
 
+    buf.resize(len);
     return buf;
 }