Add new script nfs-ssh-fw: Automatic setup of nfs tunneling though ssh.

1 files changed, 83 insertions, 0 deletions

diff --git a/nfs-ssh-fw b/nfs-ssh-fw
new file mode 100755
index 0000000..5a8e7a2
--- /dev/null
+++ b/nfs-ssh-fw
@@ -0,0 +1,83 @@
+#!/usr/bin/perl -w
+
+# Found here:
+# http://www.samag.com/documents/s=4072/sam0203d/sam0203d.htm
+
+use strict;
+use File::Basename;
+
+## CONFIGURATION
+my $nfs_server = "nfs1";          # the nfs server to connect to
+my $nfs_server_user = "james";    # a valid username on the nfs server
+my $use_version = "2";            # nfs-user-server uses 2, otherwise 3
+                                  # would be better.  Check output of
+                                  # 'rpcinfo -p <servername>'
+
+my $nfsd_client_port = "2818";    # we will port forward nfsd here
+my $mountd_client_port = "3045";  # we will port forward mountd here
+my $sleep_length = "86400";       # how long to sleep before restarting
+                                  # 86400 secs is one day. Note
+                                  # this is overridden if a command is
+                                  # specified in the server's 
+                                  # authorized_keys2 file
+
+# need to keep '-f', can also specify encryption algorithm, the ssh version
+# and the id key
+my $ssh_opts = "-f -c blowfish -2 -i /home/james/.ssh/id_dsa_nfs";
+
+my %rpcinfo_col = (               # change as per output of rpcinfo -p
+    'program'     => '0',
+    'version'     => '1',
+    'protocol'     => '2',
+    'port'        => '3',
+    'daemon'    => '4'
+);
+
+## END CONFIGURATION
+
+# not much should need to change below here
+my $prog_name = basename($0);
+my $nfsd_server_port = "";
+my $mountd_server_port = "";
+
+
+# for signals
+$SIG{INT} = sub { die "$0 interrupted and dying (does not kill ssh)\n" };
+
+my $first_time = 1;
+while (1) {
+    if ($first_time) {
+        print "$prog_name: Starting ssh/nfs forwarding&#151;\n";
+        $first_time = 0;
+    } else {
+        print "$prog_name: Restarting ssh/nfs forwarding&#151;\n";
+    }
+
+    # first, get the rpcinfo
+    my @rpcinfo = `rpcinfo -p $nfs_server`;
+
+    print "My rpcinfo =\n @rpcinfo";
+
+    # now get the nfsd and mountd port numbers
+    foreach (@rpcinfo) {
+        my @line = split;
+        if ($line[$rpcinfo_col{"version"}] eq $use_version &&
+            $line[$rpcinfo_col{"daemon"}] eq "nfs" &&
+            $line[$rpcinfo_col{"protocol"}] eq "tcp") {
+                $nfsd_server_port = $line[$rpcinfo_col{"port"}];
+            print (" nfsd port = $nfsd_server_port");
+        } elsif ($line[$rpcinfo_col{"version"}] eq $use_version &&
+            $line[$rpcinfo_col{"daemon"}] eq "mountd" &&
+            $line[$rpcinfo_col{"protocol"}] eq "tcp") {
+                $mountd_server_port = $line[$rpcinfo_col{"port"}];
+            print (", mountd port = $mountd_server_port\n");
+        }
+    }
+
+    # now run ssh (if this fails, we get the error message and
+    # retry).  This should run all the time.  This also won't die
+    # unless the nfs mount is done.
+    `/usr/bin/ssh $ssh_opts -L \
+      $nfsd_client_port:$nfs_server:$nfsd_server_port -L \
+      $mountd_client_port:$nfs_server:$mountd_server_port -l \
+      $nfs_server_user $nfs_server /bin/sleep $sleep_length`;