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Add --experimental-remote-ip option.

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This commit is contained in:
John Hood
2016-04-17 19:01:20 -04:00
parent 880c639361
commit eb98976410
2 changed files with 153 additions and 65 deletions
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man/mosh.1
+31
View File
@@ -82,6 +82,10 @@ apply the locale-related environment variables from the client and try
again.
.SH OPTIONS
Options named \fB \-\-experimental-*\fP are subject to change or
removal in future versions of Mosh; their design or function is not
yet final.
.TP
.B \fIcommand\fP
Command to run on remote host. By default, \fBmosh\fP executes a login shell.
@@ -202,6 +206,33 @@ Invoke \fBmosh-server\fP locally, without using \fBssh\fP. This
option requires the \fBhost\fP argument to be a local, numeric
IPv4/IPv6 address. This option is useful for testing.
.TP
.B \-\-experimental\-remote\-ip={proxy|local|remote}
Select the method used to discover the IP address that the
\fBmosh-client\fP connects to.
The default is \fBproxy\fP, which uses SSH's
.B \-\-ssh\-proxy\-command
option to generate and report the exact address that \fBssh\fP uses to
connect to the remote host. This option is generally the most
compatible with hosts and other options configured in \fBssh\fP
configuration files. However, this may not work for some
configurations, or for environments where a \fBssh\fP bastion host
forwards to a remote machine. It only works with \fBOpenSSH\fP.
With \fBremote\fP, the server's
.B SSH_CONNECTION
environment variable will be used. This is useful for environments
where \fBssh\fP forwarding is used, or the
.B \-\-ssh\-proxy\-command
option is used for other purposes.
With \fBlocal\fP, Mosh resolves the hostname given on its command
line, and uses that address for both \fBssh\fP and Mosh connections.
This option ignores any configuration in
.B ssh_config
for the same hostname.
.SH ESCAPE SEQUENCES
The default escape character used by Mosh is ASCII RS (decimal 30).
scripts/mosh.pl
+122 -65
View File
@@ -58,6 +58,8 @@ my $predict = undef;
my $bind_ip = undef;
my $use_remote_ip = 'proxy';
my $family = 'all';
my $port_request = undef;
@@ -101,6 +103,10 @@ qq{Usage: $0 [options] [--] [user@]host [command...]
--local run mosh-server locally without using ssh
--experimental-remote-ip=(local|remote|proxy) select the method for
discovering the remote IP address to use for mosh
(default: "proxy")
--help this message
--version version and copyright information
@@ -141,7 +147,8 @@ GetOptions( 'client=s' => \$client,
'help' => \$help,
'version' => \$version,
'fake-proxy!' => \my $fake_proxy,
'bind-server=s' => \$bind_ip) or die $usage;
'bind-server=s' => \$bind_ip,
'experimental-remote-ip=s' => \$use_remote_ip) or die $usage;
die $usage if ( defined $help );
die $version_message if ( defined $version );
@@ -156,6 +163,21 @@ if ( defined $predict ) {
predict_check( $predict, 0 );
}
if ( not grep { $_ eq $use_remote_ip } qw { local remote proxy } ) {
die "Unknown parameter $use_remote_ip";
}
$family = lc( $family );
# Handle IPv4-only Perl installs.
if (!$have_ipv6) {
# Report failure if IPv6 needed and not available.
if (defined($family) && $family eq "inet6") {
die "$0: IPv6 sockets not available in this Perl install\n";
}
# Force IPv4.
$family = "inet";
}
if ( defined $port_request ) {
if ( $port_request =~ m{^(\d+)(:(\d+))?$} ) {
my ( $low, $clause, $high ) = ( $1, $2, $3 );
@@ -204,65 +226,11 @@ if ( ! defined $fake_proxy ) {
}
} else {
my ( $host, $port ) = @ARGV;
my $err;
my @res;
my $af;
$family = lc( $family );
# Handle IPv4-only Perl installs.
if (!$have_ipv6) {
# Report failure if IPv6 needed and not available.
if (defined($family) && $family eq "inet6") {
die "$0: IPv6 sockets not available in this Perl install\n";
}
# Force IPv4.
$family = "inet";
}
# If the user selected a specific family, parse it.
if ( defined( $family ) && ( $family ne "auto" && $family ne "all" )) {
# Choose an address family, or cause pain.
my $afstr = 'AF_' . uc( $family );
$af = eval { IO::Socket->$afstr } or die "$0: Invalid family $family\n";
}
# First try the address as a numeric.
my %hints = ( flags => AI_NUMERICHOST,
socktype => SOCK_STREAM,
protocol => IPPROTO_TCP );
if ( defined( $af )) {
$hints{family} = $af;
}
( $err, @res ) = getaddrinfo( $host, $port, \%hints );
if ( $err ) {
# Get canonical name for this host.
$hints{flags} = AI_CANONNAME;
( $err, @res ) = getaddrinfo( $host, $port, \%hints );
die "$0: could not get canonical name for $host: ${err}\n" if $err;
# Then get final resolution of the canonical name.
$hints{flags} = undef;
my @newres;
( $err, @newres ) = getaddrinfo( $res[0]{canonname}, $port, \%hints );
die "$0: could not resolve canonical name ${res[0]{canonname}} for ${host}: ${err}\n" if $err;
@res = @newres;
}
# If v4 or v6 was specified, reduce the host list.
if ( defined( $af )) {
@res = grep {$_->{family} == $af} @res;
} elsif ( $family ne 'all' ) {
# If v4/v6/all were not specified, verify that this host only has one address family available.
for my $ai ( @res ) {
if ( !defined( $af )) {
$af = $ai->{family};
} else {
die "$0: host has both IPv4 and IPv6 addresses, use --family to specify behavior\n"
if $af != $ai->{family};
}
}
}
my @res = resolvename( $host, $port, $family );
# Now try and connect to something.
my $err;
my $sock;
my $addr_string;
my $service;
@@ -329,17 +297,52 @@ if ( (not defined $colors)
$ENV{ 'MOSH_CLIENT_PID' } = $$; # We don't support this, but it's useful for test and debug.
# If we are using a locally-resolved address, we have to get it before we fork,
# so both parent and child get it.
my $ip;
if ( $use_remote_ip eq 'local' ) {
# "parse" the host from what the user gave us
my $host = $userhost;
$host =~ s/.*@//;
if ( !defined $host ) {
die( "could not find hostname in $userhost" );
}
# get list of addresses
my @res = resolvename( $host, 22, $family );
# Use only the first address as the Mosh IP
my $hostaddr = $res[0];
if ( !defined $hostaddr ) {
die( "could not find address for $host" );
}
my ( $err, $addr_string, $service ) = getnameinfo( $hostaddr->{addr}, NI_NUMERICHOST );
if ( $err ) {
die( "could not use address for $host" );
}
$ip = $addr_string;
$userhost =~ s/${host}/${ip}/;
}
my $pid = open(my $pipe, "-|");
die "$0: fork: $!\n" unless ( defined $pid );
if ( $pid == 0 ) { # child
open(STDERR, ">&STDOUT") or die;
# Ask the server for its IP. The user's shell may not be
# Posix-compatible so invoke sh explicitly.
my $ssh_connection = "sh -c " .
shell_quote ( '[ -n "$SSH_CONNECTION" ] && printf "\nMOSH SSH_CONNECTION %s\n" "$SSH_CONNECTION"' ) .
";";
my @sshopts = ( '-n', '-tt' );
my $ssh_connection = "";
if ( $use_remote_ip eq 'remote' ) {
# Ask the server for its IP. The user's shell may not be
# Posix-compatible so invoke sh explicitly.
$ssh_connection = "sh -c " .
shell_quote ( '[ -n "$SSH_CONNECTION" ] && printf "\nMOSH SSH_CONNECTION %s\n" "$SSH_CONNECTION"' ) .
" ; ";
# Only with 'remote', we may need to tell SSH which protocol to use.
if ( $family eq 'inet' ) {
push @sshopts, '-4';
} elsif ( $family eq 'inet6' ) {
push @sshopts, '-6';
}
}
my @server = ( 'new' );
push @server, ( '-c', $colors );
@@ -365,12 +368,15 @@ if ( $pid == 0 ) { # child
exec( $server, @server );
die "Cannot exec $server: $!\n";
}
my $quoted_proxy_command = shell_quote( $0, "--family=$family" );
my @exec_argv = ( @ssh, '-S', 'none', '-o', "ProxyCommand=$quoted_proxy_command --fake-proxy -- %h %p", '-n', '-tt', $userhost, '--', $ssh_connection . " $server " . shell_quote( @server ) );
if ( $use_remote_ip eq 'proxy' ) {
my $quoted_proxy_command = shell_quote( $0, "--family=$family" );
push @sshopts, ( '-S', 'none', '-o', "ProxyCommand=$quoted_proxy_command --fake-proxy -- %h %p" );
}
my @exec_argv = ( @ssh, @sshopts, $userhost, '--', $ssh_connection . "$server " . shell_quote( @server ) );
exec @exec_argv;
die "Cannot exec ssh: $!\n";
} else { # parent
my ( $ip, $sship, $port, $key );
my ( $sship, $port, $key );
my $bad_udp_port_warning = 0;
LINE: while ( <$pipe> ) {
chomp;
@@ -440,3 +446,54 @@ sub locale_vars {
return @assignments;
}
sub resolvename {
my ( $host, $port, $family ) = @_;
my $err;
my @res;
my $af;
# If the user selected a specific family, parse it.
if ( defined( $family ) && ( $family ne "auto" && $family ne "all" )) {
# Choose an address family, or cause pain.
my $afstr = 'AF_' . uc( $family );
$af = eval { IO::Socket->$afstr } or die "$0: Invalid family $family\n";
}
# First try the address as a numeric.
my %hints = ( flags => AI_NUMERICHOST,
socktype => SOCK_STREAM,
protocol => IPPROTO_TCP );
if ( defined( $af )) {
$hints{family} = $af;
}
( $err, @res ) = getaddrinfo( $host, $port, \%hints );
if ( $err ) {
# Get canonical name for this host.
$hints{flags} = AI_CANONNAME;
( $err, @res ) = getaddrinfo( $host, $port, \%hints );
die "$0: could not get canonical name for $host: ${err}\n" if $err;
# Then get final resolution of the canonical name.
$hints{flags} = undef;
my @newres;
( $err, @newres ) = getaddrinfo( $res[0]{canonname}, $port, \%hints );
die "$0: could not resolve canonical name ${res[0]{canonname}} for ${host}: ${err}\n" if $err;
@res = @newres;
}
# If v4 or v6 was specified, reduce the host list.
if ( defined( $af )) {
@res = grep {$_->{family} == $af} @res;
} elsif ( $family ne 'all' ) {
# If v4/v6/all were not specified, verify that this host only has one address family available.
for my $ai ( @res ) {
if ( !defined( $af )) {
$af = $ai->{family};
} else {
die "$0: host has both IPv4 and IPv6 addresses, use --family to specify behavior\n"
if $af != $ai->{family};
}
}
}
return @res;
}