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[GNUnet-SVN] r22317 - gnunet/src/vpn
From: |
gnunet |
Subject: |
[GNUnet-SVN] r22317 - gnunet/src/vpn |
Date: |
Tue, 26 Jun 2012 21:54:27 +0200 |
Author: schanzen
Date: 2012-06-26 21:54:27 +0200 (Tue, 26 Jun 2012)
New Revision: 22317
Modified:
gnunet/src/vpn/test_gns_vpn.c
Log:
-add rp filter fix
Modified: gnunet/src/vpn/test_gns_vpn.c
===================================================================
--- gnunet/src/vpn/test_gns_vpn.c 2012-06-26 19:37:49 UTC (rev 22316)
+++ gnunet/src/vpn/test_gns_vpn.c 2012-06-26 19:54:27 UTC (rev 22317)
@@ -431,9 +431,85 @@
}
+/**
+ * Run the given command and wait for it to complete.
+ *
+ * @param file name of the binary to run
+ * @param cmd command line arguments (as given to 'execv')
+ * @return 0 on success, 1 on any error
+ */
+static int
+fork_and_exec (const char *file,
+ char *const cmd[])
+{
+ int status;
+ pid_t pid;
+ pid_t ret;
+
+ pid = fork ();
+ if (-1 == pid)
+ {
+ fprintf (stderr,
+ "fork failed: %s\n",
+ strerror (errno));
+ return 1;
+ }
+ if (0 == pid)
+ {
+ /* we are the child process */
+ /* close stdin/stdout to not cause interference
+ with the helper's main protocol! */
+ (void) close (0);
+ (void) close (1);
+ (void) execv (file, cmd);
+ /* can only get here on error */
+ fprintf (stderr,
+ "exec `%s' failed: %s\n",
+ file,
+ strerror (errno));
+ _exit (1);
+ }
+ /* keep running waitpid as long as the only error we get is 'EINTR' */
+ while ( (-1 == (ret = waitpid (pid, &status, 0))) &&
+ (errno == EINTR) );
+ if (-1 == ret)
+ {
+ fprintf (stderr,
+ "waitpid failed: %s\n",
+ strerror (errno));
+ return 1;
+ }
+ if (! (WIFEXITED (status) && (0 == WEXITSTATUS (status))))
+ return 1;
+ /* child process completed and returned success, we're happy */
+ return 0;
+}
+
int
main (int argc, char *const *argv)
{
+ char *sbin_sysctl;
+ char *const sysctl_args[] = {"sysctl", "-w",
"net.ipv4.conf.default.rp_filter=0", NULL};
+
+ if (0 == ACCESS ("/sbin/sysctl", X_OK))
+ sbin_sysctl = "/sbin/sysctl";
+ else if (0 == ACCESS ("/usr/sbin/sysctl", X_OK))
+ sbin_sysctl = "/usr/sbin/sysctl";
+ else
+ {
+ fprintf (stderr,
+ "Fatal: executable sysctl not found in approved directories:
%s\n",
+ strerror (errno));
+ return 0;
+ }
+
+ if (0 != fork_and_exec (sbin_sysctl, sysctl_args))
+ {
+ fprintf (stderr,
+ "Failed to enable IPv4 forwarding. Will continue anyway.\n");
+ return 1;
+ }
+
if (0 != ACCESS ("/dev/net/tun", R_OK))
{
GNUNET_log_strerror_file (GNUNET_ERROR_TYPE_ERROR,
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