From 1adc7e5a2a1230825154e671a36639af6006764f Mon Sep 17 00:00:00 2001
From: Graham Mainwaring <graham@mhn.org>
Date: Sun, 24 Apr 2022 18:19:25 -0400
Subject: [PATCH] Set ping_group_range so ping works

---
 netns-exec.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/netns-exec.c b/netns-exec.c
index 8d11fa3..b48223b 100644
--- a/netns-exec.c
+++ b/netns-exec.c
@@ -14,6 +14,7 @@
 #include <errno.h>
 #include <string.h>
 #include <stdbool.h>
+#include <fcntl.h>
 
 #include "namespace.h"
 
@@ -108,6 +109,16 @@ int main(int argc, char *argv[])
         return EXIT_OTHER_ERROR;
 
 
+    // allow non-root user to use the ping command
+    int fd = open("/proc/sys/net/ipv4/ping_group_range", O_WRONLY);
+    if (fd == -1) {
+        fprintf(stderr, "Error setting ping_group_range: %s\n", strerror(errno));
+        usage(argv0, true);
+    }
+    dprintf(fd, "0 2147483647\n");
+    close(fd);
+
+
     drop_root_privileges();