| 1 | #!/usr/bin/perl -w |
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| 2 | |
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| 3 | # Kevin Lahey, lahey@isi.edu |
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| 4 | # July 11, 2007 |
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| 5 | |
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| 6 | # Set up ssh tunnel infrastructure for federation: |
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| 7 | # |
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| 8 | # * Parse the configuration file provided. |
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| 9 | # |
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| 10 | # * Figure out whether we're the initiator or the reciever; if we're |
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| 11 | # the receiver, we just need to set up ssh keys and exit. |
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| 12 | # |
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| 13 | # * Pick out the experimental interface, remove the IP address |
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| 14 | # |
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| 15 | # * Create a layer 2 ssh tunnel, set up bridging, and hang loose. |
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| 16 | # |
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| 17 | |
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| 18 | use strict; |
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| 19 | use Getopt::Std; |
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| 20 | use POSIX qw(strftime); |
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| 21 | use Sys::Hostname; |
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| 22 | use IO::File; |
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| 23 | use File::Copy; |
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| 24 | |
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| 25 | my $IFCONFIG = "/sbin/ifconfig"; |
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| 26 | my $TMCC = "/usr/local/etc/emulab/tmcc"; |
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| 27 | my $FINDIF = "/usr/local/etc/emulab/findif"; |
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| 28 | # If a special version of ssh is required, it will be installed in |
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| 29 | # /usr/local/bin/ssh. Otherwise use the usual one. |
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| 30 | my $SSH = -x "/usr/local/bin/ssh" ? "/usr/local/bin/ssh" : "/usr/bin/ssh"; |
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| 31 | my $NC = "/usr/bin/nc"; |
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| 32 | my $SSH_PORT = 22; |
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| 33 | my $ROUTE_GET = "/sbin/route get"; # XXX: works on FreeBSD, but should |
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| 34 | # should be 'ip route get' for Linux |
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| 35 | my $sshd_config = "/etc/ssh/sshd_config"; # Probably should be a param |
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| 36 | |
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| 37 | # Ports that are forwarded between testbeds |
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| 38 | my $TMCD_PORT = 7777; |
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| 39 | my $SMBFS_PORT = 139; |
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| 40 | my $PUBSUB_PORT = 16505; |
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| 41 | my $SEER_PORT = 16606; |
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| 42 | |
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| 43 | |
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| 44 | my $remote_pubsub_port = $PUBSUB_PORT - 1; # There will be a local |
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| 45 | # pubsubd running, so we |
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| 46 | # dodge the port on the |
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| 47 | # remote tunnel node. |
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| 48 | die "Cannot exec $SSH" unless -x $SSH; |
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| 49 | |
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| 50 | sub setup_bridging; |
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| 51 | sub setup_tunnel_cfg; |
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| 52 | sub parse_config; |
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| 53 | |
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| 54 | # Option use is as follows: |
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| 55 | # -f filename containing config file |
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| 56 | # -d turn on debugging output |
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| 57 | # -r remotely invoked |
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| 58 | # (if remotely invoked the last two args are the tun interface |
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| 59 | # number and the remote address of the tunnel) |
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| 60 | |
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| 61 | my $usage = "Usage: fed-tun.pl [-r] [-d] [-f config-filename] [count addr]\n"; |
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| 62 | |
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| 63 | my %opts; # Note that this is used for both getops and the options file |
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| 64 | my @expected_opts = qw(active tunnelcfg bossname fsname type |
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| 65 | peer pubkeys privkeys); |
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| 66 | my $filename; |
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| 67 | my $remote; |
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| 68 | my $debug = 1; |
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| 69 | my $count; |
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| 70 | my $addr; |
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| 71 | my $active; |
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| 72 | my $type; |
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| 73 | my $tunnelcfg; |
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| 74 | my @ssh_port_fwds; # Queue of ssh portforwarders to start. The |
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| 75 | # -L or -R is in here. |
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| 76 | my $remote_script_dir; # location of the other sides fed-tun.pl |
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| 77 | my $event_repeater; # The pathname of the event repeater |
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| 78 | |
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| 79 | if ($#ARGV != 0 && !getopts('df:rn', \%opts)) { |
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| 80 | die "$usage"; |
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| 81 | } |
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| 82 | |
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| 83 | if (defined($opts{'d'})) { |
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| 84 | $debug = 1; |
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| 85 | } |
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| 86 | |
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| 87 | if (defined($opts{'f'})) { |
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| 88 | $filename = $opts{'f'}; |
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| 89 | } |
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| 90 | else { |
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| 91 | # Find the configuration file in the usual place, which depends on what |
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| 92 | # experiment and project we're in. |
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| 93 | my $pid; |
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| 94 | my $eid; |
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| 95 | |
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| 96 | open(TMCD, "$TMCC status |") || die "tmcc failed\n"; |
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| 97 | print "Opened $TMCC status\n" if ($debug); |
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| 98 | while (<TMCD>) { |
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| 99 | chomp; |
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| 100 | /ALLOCATED=([^\/]+)\/(\S+)/ && do { |
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| 101 | $pid = $1; |
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| 102 | $eid = $2; |
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| 103 | }; |
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| 104 | } |
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| 105 | close(TMCD); |
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| 106 | my $hn = `hostname`; |
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| 107 | chomp $hn; |
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| 108 | $filename = "/proj/$pid/exp/$eid/tmp/$hn.gw.conf" |
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| 109 | if $pid and $eid; |
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| 110 | } |
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| 111 | |
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| 112 | if (defined($opts{'r'})) { |
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| 113 | $remote = 1; |
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| 114 | die "$usage" if ($#ARGV != 1); |
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| 115 | |
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| 116 | $count = pop @ARGV; |
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| 117 | $addr = pop @ARGV; |
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| 118 | } |
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| 119 | |
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| 120 | die "$usage" if (!defined($remote) && !defined($filename)); |
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| 121 | |
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| 122 | if (defined($filename)) { |
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| 123 | &parse_config("$filename", \%opts) || |
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| 124 | die "Cannot read config file $filename: $!\n"; |
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| 125 | |
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| 126 | foreach my $opt (@expected_opts) { |
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| 127 | warn "Missing $opt option\n" if (!defined($opts{$opt})); |
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| 128 | } |
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| 129 | |
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| 130 | $active = 1 if ($opts{'active'} =~ /true/i); |
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| 131 | $tunnelcfg = 1 if ($opts{'tunnelcfg'} =~ /true/i); |
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| 132 | $type = $opts{'type'}; |
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| 133 | $type =~ tr/A-Z/a-z/; |
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| 134 | $remote_script_dir = $opts{'remotescriptdir'} || "."; |
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| 135 | $event_repeater = $opts{'eventrepeater'}; |
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| 136 | my $listen_on = $opts{'sshlisten'}; |
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| 137 | |
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| 138 | if (defined($opts{'fsname'})) { |
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| 139 | push(@ssh_port_fwds,"-R $listen_on:$SMBFS_PORT:$opts{'fsname'}:$SMBFS_PORT"); |
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| 140 | } |
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| 141 | |
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| 142 | if (defined($opts{'bossname'})) { |
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| 143 | push(@ssh_port_fwds, "-R $listen_on:$TMCD_PORT:$opts{'bossname'}:$TMCD_PORT"); |
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| 144 | } |
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| 145 | |
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| 146 | if (defined($opts{'eventservername'})) { |
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| 147 | push(@ssh_port_fwds,"-R ". |
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| 148 | "$listen_on:$remote_pubsub_port:$opts{'eventservername'}:$PUBSUB_PORT"); |
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| 149 | } |
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| 150 | if (defined($opts{'remoteeventservername'})) { |
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| 151 | push(@ssh_port_fwds,"-L :$remote_pubsub_port:" . |
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| 152 | "$opts{'remoteeventservername'}:$PUBSUB_PORT"); |
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| 153 | } |
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| 154 | |
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| 155 | # Forward connections to seer from remote TBs to control in this TB |
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| 156 | if (defined($opts{'seercontrol'})) { |
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| 157 | push(@ssh_port_fwds,"-R $listen_on:$SEER_PORT:$opts{seercontrol}:$SEER_PORT"); |
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| 158 | } |
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| 159 | |
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| 160 | # -n just starts the ssh tap tunnel |
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| 161 | @ssh_port_fwds = () if ($opts{'type'} eq 'experiment' || $opts{'n'}); |
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| 162 | |
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| 163 | print "ssh_port_fwds = ", join("\n",@ssh_port_fwds), "\n" if ($debug); |
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| 164 | } |
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| 165 | |
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| 166 | # Both sides need to have GatewayPorts and PermitTunnel set. Copy the existing |
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| 167 | # sshd_config, making sure GatewayPorts and PermitTunnel are set to yes, |
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| 168 | # replace the original, and restart sshd. |
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| 169 | my $ports_on = 0; |
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| 170 | my $tunnel_on = 0; |
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| 171 | |
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| 172 | my $conf = new IO::File($sshd_config) || die "Can't open $sshd_config: $!\n"; |
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| 173 | my $new_conf = new IO::File(">/tmp/sshd_config") || |
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| 174 | die "Can't open new ssh_config: $!\n"; |
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| 175 | |
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| 176 | while(<$conf>) { |
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| 177 | s/^\s*GatewayPorts.*/GatewayPorts yes/ && do { |
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| 178 | print $new_conf $_ unless $ports_on++; |
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| 179 | next; |
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| 180 | }; |
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| 181 | s/^\s*PermitTunnel.*/PermitTunnel yes/ && do { |
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| 182 | print $new_conf $_ unless $tunnel_on++; |
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| 183 | next; |
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| 184 | }; |
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| 185 | print $new_conf $_; |
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| 186 | } |
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| 187 | print $new_conf "GatewayPorts yes\n" unless $ports_on; |
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| 188 | print $new_conf "PermitTunnel yes\n" unless $tunnel_on; |
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| 189 | $conf->close(); |
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| 190 | $new_conf->close(); |
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| 191 | |
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| 192 | copy("/tmp/sshd_config", $sshd_config) || |
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| 193 | die "Cannot replace $sshd_config: $!\n"; |
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| 194 | |
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| 195 | system("/etc/rc.d/sshd restart"); |
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| 196 | |
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| 197 | # Need these to make the Ethernet tap and bridge to work... |
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| 198 | system("kldload /boot/kernel/bridgestp.ko") |
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| 199 | if -r "/boot/kernel/bridgestp.ko"; |
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| 200 | system("kldload /boot/kernel/if_bridge.ko"); |
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| 201 | system("kldload /boot/kernel/if_tap.ko"); |
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| 202 | |
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| 203 | if ($tunnelcfg && !$remote) { |
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| 204 | # Most Emulab-like testbeds use globally-routable addresses on the |
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| 205 | # control net; at DETER, we isolate the control net from the Internet. |
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| 206 | # On DETER-like testbeds, we need to create special tunneling nodes |
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| 207 | # with external access. Set up the external addresses as necessary. |
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| 208 | &setup_tunnel_cfg(%opts); |
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| 209 | } |
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| 210 | |
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| 211 | if (!$remote) { |
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| 212 | system("umask 077 && cp $opts{'privkeys'} /root/.ssh/id_rsa"); |
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| 213 | system("umask 077 && cp $opts{'pubkeys'} /root/.ssh/id_rsa.pub"); |
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| 214 | system("umask 077 && cat $opts{'pubkeys'} >> /root/.ssh/authorized_keys"); |
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| 215 | } |
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| 216 | |
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| 217 | if ($active) { |
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| 218 | # If we're the initiator, open up a separate tunnel to the remote |
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| 219 | # host for each of the different experiment net interfaces on this |
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| 220 | # machine. Execute this startup script on the far end, but with |
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| 221 | # the -r option to indicate that it's getting invoked remotely and |
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| 222 | # we should just handle the remote-end tasks. |
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| 223 | |
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| 224 | # Set up synchronization, so that the various user machines won't try to |
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| 225 | # contact boss before the tunnels are set up. (Thanks jjh!) |
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| 226 | |
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| 227 | do { |
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| 228 | system("$NC -z $opts{'peer'} $SSH_PORT"); |
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| 229 | } until (!$?); |
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| 230 | |
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| 231 | # XXX: Do we need to clear out previously created bridge interfaces? |
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| 232 | |
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| 233 | my $count = 0; |
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| 234 | my @SSHCMD; |
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| 235 | |
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| 236 | # If we are just setting up a control net connection, just fire up |
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| 237 | # ssh with the null command, and hang loose. |
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| 238 | |
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| 239 | if ($type eq "control") { |
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| 240 | foreach my $fwd (@ssh_port_fwds) { |
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| 241 | system("$SSH -N $fwd -o \"StrictHostKeyChecking no\" ". |
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| 242 | "$opts{'peer'} &"); #or die "Failed to run ssh"; |
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| 243 | } |
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| 244 | |
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| 245 | exit; |
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| 246 | } |
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| 247 | |
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| 248 | open(IFFILE, "/var/emulab/boot/ifmap") || die "couldn't open ifmap\n"; |
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| 249 | while (<IFFILE>) { |
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| 250 | my @a = split(' '); |
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| 251 | my $iface = $a[0]; |
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| 252 | my $addr = $a[1]; |
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| 253 | my $bridge = "bridge" . $count; |
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| 254 | my $tun = "tap" . $count; |
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| 255 | my $cmd; |
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| 256 | |
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| 257 | print "Found $iface, $addr, to bridge on $bridge\n" if ($debug); |
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| 258 | |
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| 259 | # Note that we're going to fire off an ssh which will never return; |
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| 260 | # we need the connection to stay up to keep the tunnel up. |
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| 261 | # In order to check for problems, we open it this way and read |
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| 262 | # the expected single line of output when the tunnel is connected. |
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| 263 | # To make debugging easier and to degrade more gracefully, I've split |
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| 264 | # these out into multiple processes. |
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| 265 | |
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| 266 | foreach my $fwd (@ssh_port_fwds) { |
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| 267 | $cmd = "$SSH -N $fwd -o \"StrictHostKeyChecking no\" ". |
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| 268 | "$opts{'peer'} &"; |
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| 269 | |
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| 270 | print "$cmd\n" if $debug; |
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| 271 | system("$cmd"); # or die "Failed to run ssh"; |
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| 272 | } |
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| 273 | # The Tunnel option specifies the level to tunnel at. Ethernet creates |
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| 274 | # a tap device rather than a tun device. Strict host key checking |
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| 275 | # avoids asking the user to OK a strange host key. |
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| 276 | $cmd = "$SSH -w $count:$count -o \"Tunnel ethernet\" " . |
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| 277 | "-o \"StrictHostKeyChecking no\" " . |
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| 278 | "$opts{'peer'} \"$remote_script_dir/fed-tun.pl " . |
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| 279 | "-r $addr $count\" & |"; |
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| 280 | |
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| 281 | print "$cmd\n" if $debug; |
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| 282 | |
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| 283 | open(SSHCMD, $cmd) |
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| 284 | or die "Failed to run ssh"; |
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| 285 | # Wait for the other end to report its work done. This string comes |
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| 286 | # from the block below (after the elsif) -- tvf |
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| 287 | my $check; # Make sure something ran... |
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| 288 | |
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| 289 | while ($check = <SSHCMD>) { |
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| 290 | last if $check =~ /^Remote connection all/; |
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| 291 | } |
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| 292 | print "Got line [$check] from remote side\n" if ($debug); |
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| 293 | |
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| 294 | &setup_bridging($tun, $bridge, $iface, $addr); |
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| 295 | $count++; |
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| 296 | @ssh_port_fwds = (); # only do this on the first connection |
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| 297 | } |
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| 298 | close(IFFILE); |
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| 299 | |
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| 300 | # Start a local event repeater (unless we're missing parameters |
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| 301 | die "Missing event repeater params (No config file ?)\n" |
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| 302 | unless $event_repeater && $opts{'remoteexperiment'} && |
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| 303 | $opts{'localexperiment'}; |
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| 304 | |
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| 305 | print "Starting event repeater\n" if $debug; |
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| 306 | |
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| 307 | print("$event_repeater -M -P $remote_pubsub_port -S localhost " . |
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| 308 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}\n") |
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| 309 | if $debug; |
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| 310 | # Connect to the forwarded pubsub port on this host to listen to the |
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| 311 | # other experiment's events, and to the local experiment to forward |
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| 312 | # events. |
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| 313 | system("$event_repeater -M -P $remote_pubsub_port -S localhost " . |
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| 314 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}"); |
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| 315 | warn "Event repeater returned $?\n" if $?; |
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| 316 | } elsif ($remote) { |
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| 317 | # We're on the remote system; figure out which interface to |
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| 318 | # tweak, based on the IP address passed in. |
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| 319 | |
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| 320 | my $iter = 0; |
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| 321 | my $iface; |
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| 322 | |
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| 323 | open(RTFILE, "$ROUTE_GET $addr |") || die "couldn't do $ROUTE_GET\n"; |
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| 324 | while (<RTFILE>) { |
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| 325 | if (/interface: (\w+)/) { |
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| 326 | $iface = $1; |
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| 327 | } |
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| 328 | } |
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| 329 | close(RTFILE); |
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| 330 | |
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| 331 | die "Couldn't find interface to use." if (!defined($iface)); |
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| 332 | my $bridge = "bridge" . $count; |
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| 333 | my $tun = "tap" . $count; |
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| 334 | |
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| 335 | &setup_bridging($tun, $bridge, $iface, $addr); |
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| 336 | print "Remote connection all set up!\n"; # Trigger other end with output |
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| 337 | |
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| 338 | # If this is the first remote invocation on a control gateway, start the |
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| 339 | # event repeater. |
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| 340 | |
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| 341 | if ( $count == 0 && $type ne "experiment" ) { |
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| 342 | my $remote_pubsub_port = $PUBSUB_PORT - 1; # There will be a local |
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| 343 | # pubsubd running, so we |
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| 344 | # dodge the port on the |
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| 345 | # remote tunnel node. |
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| 346 | # Make sure we have the relevant parameters |
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| 347 | die "Missing event repeater params (No config file ?)\n" |
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| 348 | unless $event_repeater && $opts{'remoteexperiment'} && |
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| 349 | $opts{'localexperiment'}; |
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| 350 | |
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| 351 | print "Starting event repeater\n" if $debug; |
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| 352 | |
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| 353 | # Connect to the forwarded pubsub port on this host to listen to the |
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| 354 | # other experiment's events, and to the local experiment to forward |
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| 355 | # events. |
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| 356 | system("$event_repeater -P $remote_pubsub_port -S localhost " . |
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| 357 | "-E $opts{'remoteexperiment'} -e $opts{'localexperiment'}"); |
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| 358 | warn "Event repeater returned $?\n" if $?; |
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| 359 | } |
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| 360 | } else { |
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| 361 | print "inactive end of a connection, finishing" if ($debug); |
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| 362 | } |
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| 363 | |
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| 364 | print "all done!\n" if ($debug); |
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| 365 | exit; |
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| 366 | |
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| 367 | |
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| 368 | # Set up the bridging for the new stuff... |
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| 369 | |
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| 370 | sub setup_bridging($; $; $; $) { |
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| 371 | my ($tun, $bridge, $iface, $addr) = @_; |
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| 372 | |
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| 373 | print "Waiting to see if new iface $tun is up\n" if ($debug); |
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| 374 | |
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| 375 | do { |
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| 376 | sleep 1; |
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| 377 | system("$IFCONFIG $tun"); |
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| 378 | } until (!$?); |
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| 379 | |
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| 380 | print "setting up $bridge with $iface and nuking $addr\n" if ($debug); |
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| 381 | |
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| 382 | system("ifconfig $bridge create"); |
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| 383 | system("ifconfig $iface delete $addr"); |
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| 384 | system("ifconfig $bridge addm $iface up"); |
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| 385 | system("ifconfig $bridge addm $tun"); |
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| 386 | } |
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| 387 | |
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| 388 | # Set up tunnel info for DETER-like testbeds. |
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| 389 | |
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| 390 | sub setup_tunnel_cfg { |
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| 391 | my (%opts) = @_; |
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| 392 | #my $tunnel_iface = "em0"; # XXX |
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| 393 | my $tunnel_iface = $opts{'interface'} || "em0"; |
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| 394 | my $tunnel_ip; |
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| 395 | my $tunnel_mask; |
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| 396 | my $tunnel_mac; |
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| 397 | my $tunnel_router; |
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| 398 | |
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| 399 | print "Opening $TMCC tunnelip\n" if ($debug); |
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| 400 | |
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| 401 | open(TMCD, "$TMCC tunnelip |") || die "tmcc failed\n"; |
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| 402 | print "Opened $TMCC tunnelip\n" if ($debug); |
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| 403 | while (<TMCD>) { |
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| 404 | print "got one line from tmcc\n" if ($debug); |
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| 405 | print if ($debug); |
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| 406 | if (/^TUNNELIP=([0-9.]*) TUNNELMASK=([0-9.]*) TUNNELMAC=(\w*) TUNNELROUTER=([0-9.]*)$/) { |
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| 407 | $tunnel_ip = $1; |
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| 408 | $tunnel_mask = $2; |
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| 409 | $tunnel_mac = $3; |
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| 410 | $tunnel_router = $4; |
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| 411 | } |
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| 412 | } |
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| 413 | close(TMCD); |
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| 414 | |
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| 415 | print "tunnel options: ip=$tunnel_ip mask=$tunnel_mask mac=$tunnel_mac router=$tunnel_router\n" if ($debug); |
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| 416 | |
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| 417 | if (defined($tunnel_mac) && ($tunnel_mac ne "")) { |
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| 418 | print "Opening $FINDIF $tunnel_mac\n" if ($debug); |
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| 419 | open(FIF, "$FINDIF $tunnel_mac |") || die "findif failed\n"; |
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| 420 | my $line = <FIF>; |
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| 421 | chomp($line); |
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| 422 | print "$FINDIF returned $line\n" if ($debug); |
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| 423 | $tunnel_iface = $line; |
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| 424 | } |
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| 425 | |
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| 426 | system("ifconfig $tunnel_iface $tunnel_ip" . |
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| 427 | ($tunnel_mask ? " netmask $tunnel_mask" : "") . " up"); |
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| 428 | warn "configuration of tunnel interface failed" if ($?); |
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| 429 | |
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| 430 | if ($tunnel_router) { |
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| 431 | |
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| 432 | # Sometimes the insertion of DNS names lags a bit. Retry this |
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| 433 | # configuration a few times to let DNS catch up. Might want to really |
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| 434 | # check the DNS name before we try this... |
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| 435 | my $config_succeeded = 0; |
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| 436 | my $tries = 0; |
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| 437 | my $max_retries = 300; |
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| 438 | |
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| 439 | do { |
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| 440 | system("route add $opts{'peer'} $tunnel_router"); |
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| 441 | if ( $? ) { |
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| 442 | warn "configuration routes via tunnel interface failed"; |
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| 443 | $tries++; |
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| 444 | sleep(10); |
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| 445 | } |
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| 446 | else { $config_succeeded = 1; } |
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| 447 | } until ( $config_succeeded || $tries > $max_retries ); |
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| 448 | } |
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| 449 | |
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| 450 | print "setup_tunnel_cfg done\n" if ($debug); |
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| 451 | } |
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| 452 | |
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| 453 | # Trick config-file parsing code from Ted Faber: |
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| 454 | |
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| 455 | # Parse the config file. The format is a colon-separated parameter name |
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| 456 | # followed by the value of that parameter to the end of the line. This parses |
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| 457 | # that format and puts the parameters into the referenced hash. Parameter |
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| 458 | # names are mapped to lower case, parameter values are unchanged. Returns 0 on |
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| 459 | # failure (e.g. file open) and 1 on success. |
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| 460 | sub parse_config { |
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| 461 | my($file, $href) = @_; |
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| 462 | my($fh) = new IO::File($file); |
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| 463 | |
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| 464 | unless ($fh) { |
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| 465 | warn "Can't open $file: $!\n"; |
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| 466 | return 0; |
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| 467 | } |
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| 468 | |
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| 469 | while (<$fh>) { |
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| 470 | next if /^\s*#/ || /^\s*$/; # Skip comments & blanks |
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| 471 | chomp; |
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| 472 | /^([^:]+):\s*(.*)/ && do { |
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| 473 | my($key) = $1; |
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| 474 | |
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| 475 | $key =~ tr/A-Z/a-z/; |
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| 476 | $href->{$key} = $2; |
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| 477 | next; |
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| 478 | }; |
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| 479 | warn "Unparasble line in $file: $_\n"; |
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| 480 | } |
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| 481 | $fh->close(); # It will close when it goes out of scope, but... |
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| 482 | return 1; |
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| 483 | } |
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