# Copyright (C) 1992-2019, 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/>.

# Open an FTP connection to HOST.
#
proc ftp_open {host} {
    set prompt "ftp>"
    global board_info

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

    if {[board_info $host exists ftp_fileid]} {
	return [board_info $host ftp_fileid]
    }

    if {[board_info $host exists hostname]} {
	set remotehost [board_info $host hostname]
    } else {
	set remotehost $host
    }

    # LoseQVT tends to get stuck sometimes; we'll loop around a few million
    # times when it gets a "connection refused".
    set spawn_id -1
    set count 3
    while {$spawn_id < 0 && $count >= 0} {
	spawn ftp -n $remotehost
	expect {
	    -i $spawn_id -re ".*220.*$prompt" { }
	    -i $spawn_id -re ".*Connection refused.*$prompt" {
		sleep 2
		send "open $remotehost\n"
		exp_continue
	    }
	    -i $spawn_id default {
		close -i $spawn_id
		wait -i $spawn_id
		set spawn_id -1
	    }
	}
	incr count -1
    }
    if {$spawn_id < 0} {
	return -1
    }
    set board_info($host,ftp_fileid) $spawn_id
    if {[board_info $host exists ftp_username]} {
	if {[board_info $host exists ftp_password]} {
	    set command "user [board_info $host ftp_username] [board_info $host ftp_password]\n"
	} else {
	    set command "user [board_info $host ftp_username]\n"
	}
	send $command
	expect {
	    -i $spawn_id -re ".*230.*$prompt" { }
	    -i $spawn_id default {
		close -i $spawn_id
		wait -i $spawn_id
		return -1
	    }
	}
    }
    set timeout 15
    send -i $spawn_id "binary\n"
    expect {
	-i $spawn_id -re "200.*$prompt" { }
	-i $spawn_id timeout {
	    close -i $spawn_id
	    wait -i $spawn_id
	    return -1
	}
    }
    if {[board_info $host exists ftp_directory]} {
	send "cd [board_info $host ftp_directory]\n"
	expect {
	    -i $spawn_id -re "250.*$prompt" { }
	    -i $spawn_id default {
		close -i $spawn_id
		wait -i $spawn_id
		return -1
	    }
	}
    }

    if {[board_info $host exists ftp_no_passive]} {
	send "passive\n"
	expect {
	    -i $spawn_id -re "Passive mode off.*$prompt" { }
	    -i $spawn_id -re "Passive mode on.*$prompt" {
		send "passive\n"
		exp_continue
	    }
	    -i $spawn_id -re ".*$prompt" { }
	}
    }

    set board_info($host,ftp_fileid) $spawn_id
    return $spawn_id
}

# Fetch REMOTEFILE from HOST and store it as LOCALFILE.
#
proc ftp_upload {host remotefile localfile} {
    set prompt "ftp>"

    verbose "ftping $remotefile from $host to $localfile"
    set timeout 15
    set spawn_id [ftp_open $host]
    if {$spawn_id < 0} {
	return ""
    }
    set loop 1

    while {$loop} {
	send -i $spawn_id "get $remotefile $localfile\n"
	expect {
	    -i $spawn_id -re ".*Too many open files.*$prompt" {
		ftp_close $host
	    }
	    -i $spawn_id -re ".*No such file or directory.*$prompt" {
		set loop 0
		set remotefile ""
	    }
	    -i $spawn_id -re "(^|\[\r\n\])226.*$prompt" {set loop 0}
	    -i $spawn_id -re "(^|\[\r\n\])\[0-9\]\[0-9\]\[0-9\].*$prompt" {
		set loop 0
		set remotefile ""
	    }
	    -i $spawn_id default {
		ftp_close $host
	    }
	}
	if {$loop} {
	    set spawn_id [ftp_open $host]
	    if {$spawn_id < 0} {
		return ""
	    }
	}
    }
    return $localfile
}

# Download LOCALFILE to HOST as REMOTEFILE.
#
proc ftp_download {host localfile remotefile} {
    set prompt "ftp>"

    verbose "putting $localfile $remotefile"

    if {[board_info $host exists hostname]} {
	set remotehost [board_info $host hostname]
    } else {
	set remotehost $host
    }

    set spawn_id [ftp_open $host]
    if {$spawn_id < 0} {
	return ""
    }
    set loop 1

    while {$loop} {
	send -i $spawn_id "put $localfile $remotefile\n"
	expect {
	    -i $spawn_id -re ".*Too many open files.*$prompt" {
		ftp_close $host
	    }
	    -i $spawn_id -re ".*No such file or directory.*$prompt" {
		set loop 0
		set remotefile ""
	    }
	    -re {(^|[\r\n])150.*connection for (.*) [(][0-9.,]+\)[\r\n]} {
		set remotefile $expect_out(2,string)
		exp_continue
	    }
	    -i $spawn_id -re "(^|\[\r\n\])226.*$prompt" {
		set loop 0
	    }
	    -i $spawn_id -re "Timeout.*$prompt" {
		ftp_close $host
	    }
	    -i $spawn_id -re "(^|\[\r\n\])\[0-9\]\[0-9\]\[0-9\].*$prompt" {
		set loop 0
		set remotefile ""
	    }
	    -i $spawn_id default {
		ftp_close $host
	    }
	}
	if {$loop} {
	    set spawn_id [ftp_open $host]
	    if {$spawn_id < 0} {
		return ""
	    }
	}
    }
    return $remotefile
}

# Close the FTP connection to HOST.
#
proc ftp_close {host} {
    global board_info

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

    if {![board_info $host exists ftp_fileid]} {
	return ""
    }

    set spawn_id [board_info $host ftp_fileid]
    unset board_info($host,ftp_fileid)

    send -i $spawn_id "quit\n"
    close -i $spawn_id
    wait -i $spawn_id
    return ""
}