# Copyright (C) 2016-2019, 2020 Free Software Foundation, Inc.
#
# This file is part of DejaGnu.
#
# DejaGnu is free software: you can redistribute it and/or modify it
# under the terms of the GNU General Public License as published by
# the Free Software Foundation, either version 3 of the License, or
# (at your option) any later version.
#
# DejaGnu is distributed in the hope that it will be useful, but
# WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
# General Public License for more details.
#
# You should have received a copy of the GNU General Public License
# along with DejaGnu.  If not, see <http://www.gnu.org/licenses/>.

# Connect using ssh(1).

set ssh_initialized "no"
set ssh_useropts " -o ControlPersist=yes -o ControlMaster=auto -o ControlPath=\"/tmp/ssh-%r@%h:%p\""

# Default to the ssh and scp in the user's path.
set SSH ssh
set SCP scp

# Download SRCFILE to DESTFILE on DESTHOST.
#
proc ssh_download {desthost srcfile destfile} {
    global SSH SCP ssh_initialized timeout

    set ssh_port ""
    set ssh_user ""
    set ssh_useropts ""
    set name ""
    set hostname ""

    if {[board_info $desthost exists scp_prog]} {
	set SCP [board_info $desthost scp_prog]
    }

    if {[board_info $desthost exists ssh_prog]} {
	set SSH [board_info $desthost ssh_prog]
    }

    # The default user name is the person running the tests
    if {[board_info $desthost exists username]} {
	set ssh_user "[board_info $desthost username]@"
    }

    if {[board_info $desthost exists ssh_opts]} {
	append ssh_useropts " [board_info $desthost ssh_opts]"
    }

    # The default SSH port is 22
    if {[board_info $desthost exists port]} {
	set ssh_port "[board_info $desthost port]"
    } else {
	set ssh_port 22
    }

    if {[board_info $desthost exists name]} {
	set name [board_info $desthost name]
    }

    if {[board_info $desthost exists hostname]} {
	set hostname [board_info $desthost hostname]
    } else {
	set hostname $desthost
    }

    append ssh_useropts " -o ControlPersist=yes -o ControlMaster=auto -o ControlPath=/tmp/ssh-%r@%h:%p"

    set ret [local_exec "$SCP -P $ssh_port $ssh_useropts $srcfile $ssh_user$hostname:$destfile" "" "" $timeout]
    set status [lindex $ret 0]
    set output [lindex $ret 1]
    if { $status == 0 } {
	set ssh_initialized "yes"
	verbose "Copied $srcfile to $desthost:$destfile" 2
	return $destfile
    } else {
	verbose "Download via ssh to $desthost failed."
	return ""
    }
}

proc ssh_upload {desthost srcfile destfile} {
    global SSH SCP

    if {[board_info $desthost exists scp_prog]} {
	set SCP [board_info $desthost scp_prog]
    }

    if {[board_info $desthost exists username]} {
	set ssh_user "[board_info $desthost username]@"
    } else {
	set ssh_user ""
    }

    if {[board_info $desthost exists name]} {
	set desthost [board_info $desthost name]
    }

    if {[board_info $desthost exists hostname]} {
	set desthost [board_info $desthost hostname]
    }

    set status [catch "exec $SCP $ssh_user$desthost:$srcfile $destfile" output]
    if { $status == 0 } {
	verbose "Copied $desthost:$srcfile to $destfile" 2
	return $destfile
    } else {
	verbose "Upload from $desthost failed, $output."
	return ""
    }
}

# Execute CMD on BOARDNAME.
#
proc ssh_exec { boardname program pargs inp outp } {
    global SSH timeout

    set ssh_port ""
    set scp_port ""
    set ssh_user ""
    set ssh_useropts ""
    set name ""
    set hostname ""

    verbose "Executing on $boardname: $program $pargs"

    if {![board_info $boardname exists ssh_prog]} {
	set SSH ssh
    } else {
	set SSH [board_info $boardname ssh_prog]
    }

    if {[board_info $boardname exists username]} {
	set ssh_user "[board_info $boardname username]@"
    } else {
	set ssh_user ""
    }

    if {[board_info $boardname exists ssh_useropts]} {
	append ssh_useropts " [board_info $boardname ssh_opts]"
    }

    if {[board_info $boardname exists name]} {
	set boardname [board_info $boardname name]
    }

    if {[board_info $boardname exists hostname]} {
	set hostname [board_info $boardname hostname]
    } else {
	set hostname $boardname
    }

    if {[board_info $boardname  exists port]} {
	append ssh_useropts " -p [board_info $boardname port]"
    }

    append ssh_useropts " -o ControlPersist=yes -o ControlMaster=auto -o ControlPath=\"/tmp/ssh-%r@%h:%p\""

    # If CMD sends any output to stderr, exec will think it failed.
    # More often than not that will be true, but it doesn't catch the
    # case where there is no output but the exit code is non-zero.
    if { $inp eq "" } {
	set inp "/dev/null"
    }

    # We use && here, as otherwise the echo always works, which makes it look
    # like execution succeeded when in reality it failed.
    set ret [local_exec "$SSH $ssh_useropts $ssh_user$hostname sh -c '$program $pargs 2>&1 && echo XYZ\\\${?}ZYX \\; rm -f $program'" $inp $outp $timeout]
    set status [lindex $ret 0]
    set output [lindex $ret 1]

    verbose "$SSH status is $status, output is $output"

    # `status' doesn't mean much here other than ssh worked ok.
    # What we want is whether $program ran ok.  Return $status
    # if the program timed out, status will be 1 indicating that
    # ssh ran and failed.  If ssh fails, we will get FAIL rather
    # than UNRESOLVED - this will help the problem be noticed.
    if { $status != 0 } {
	regsub "XYZ(\[0-9\]*)ZYX\n?" $output "" output
	return [list $status "$SSH to $boardname failed for $program, $output"]
    }
    if { [regexp "XYZ(\[0-9\]*)ZYX" $output junk status] == 0 } {
	set status ""
    }
    verbose "ssh_exec: status:$status text:$output" 4
    if { $status eq "" } {
	return [list -1 "Couldn't parse $SSH output, $output."]
    }
    regsub "XYZ(\[0-9\]*)ZYX\n?" $output "" output
    return [list [expr {$status != 0}] $output]
}

proc ssh_close { desthost } {
    global SSH ssh_initialized

    verbose "Closing the SSH connection to $desthost"

    set ssh_port ""
    set scp_port ""
    set ssh_user ""
    set ssh_useropts ""
    set name ""
    set hostname ""

    if {[board_info $desthost exists username]} {
	set ssh_useropts "-l [board_info $desthost username]"
	set ssh_user "[board_info $desthost username]@"
    } else {
	set ssh_user ""
	set ssh_useropts ""
    }

    if {[board_info $desthost exists hostname]} {
	set hostname [board_info $desthost hostname]
    }

    if {[board_info $desthost exists ssh_opts]} {
	append ssh_useropts " [board_info $desthost ssh_opts]"
    }

    if {[board_info $desthost exists port]} {
	set ssh_port " -p [board_info $desthost port]"
    } else {
	set ssh_port ""
    }

    set args "$ssh_user$hostname $ssh_port"

   # Kill the remote server
    set status [catch "exec ssh $ssh_port -o ControlPath=/tmp/ssh-%r@%h:%p -O exit $args"]
    set ssh_initialized "no"

     return ""
}