159 lines
4.1 KiB
Bash
Executable File
159 lines
4.1 KiB
Bash
Executable File
#! /bin/sh
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# source: ftp.sh
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# Copyright Gerhard Rieger 2001-2006
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# Published under the GNU General Public License V.2, see file COPYING
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# example how to write a shell script that communicates with stdio on the front
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# end and with a socat address on the back end
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# usage:
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# ftp.sh [opts] server directory/ # show directory contents on stdout
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# ftp.sh [opts] server file # print file contents to stdout
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# opts:
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# -socks socksserver # use given socks server, port 1080
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# -proxy proxyserver # use given proxy server, port 8080
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# # must be http proxy that accepts CONNECT
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# # method to ports 21 and >=1024
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# -user username # default: "ftp"
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# -passwd password # default: "anonymous@domain.org"
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# -t # shell script trace+debug
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# -d # debug on control connection (use up to 4 times)
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# -D # debug on data connection (use up to 4 times)
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# -b # block size for data connection
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# -v # verbose
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# -l* # socat logging options
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# example:
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# ftp.sh -v -d -d -D -D -D -b 65536 -proxy proxy ftp.ftp.org /README >README
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user="ftp"
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passwd="anonymous@domain.org"
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#method="socks4:socks" # socks4 is address spec, socks is socks server name
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method=tcp
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addropts=
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# socat options
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SO1=
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SO2=
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while :; do
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case "$1" in
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-socks|-socks4) shift;
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case "$1" in
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*:*) method="socks4:${1%%:*}"; addropts="socksport=${1#*:}" ;;
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*) method="socks4:$1" ;;
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esac ;;
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-socks4a) shift;
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case "$1" in
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*:*) method="socks4a:${1%%:*}"; addropts="socksport=${1#*:}" ;;
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*) method="socks4a:$1" ;;
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esac ;;
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-proxy) shift;
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case "$1" in
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*:*) method="proxy:${1%%:*}"; addropts="proxyport=${1#*:}" ;;
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*) method="proxy:$1" ;;
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esac ;;
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-user) shift; user="$1" ;;
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-passwd) shift; passwd="$1" ;;
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-t) set -vx ;;
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-d) SO1="$SO1 -d" ;;
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-D) SO2="$SO2 -d" ;;
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-b) SO2="$SO2 -b $2"; shift ;;
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-v) SO1="$SO1 -v" ;;
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-l*) SO1="$SO1 $1"; SO2="$SO2 $1" ;;
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-*) echo "unknown option \"$1\"" >&2; exit 1;;
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*) break ;;
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esac
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shift
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done
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export SO2
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server="$1"
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dir="$2"
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echo "addr=$method:$server:21,$addropts"; exit
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### this is the central part to establish communication with socat ###
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### copy these lines to make new communication shell scripts
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TMPDIR=$(if [ -x /bin/mktemp ]; then
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/bin/mktemp -d /tmp/$USER/FTPSH.XXXXXX
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else
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(umask 077; d=/tmp/$USER/FTPSH.$$; mkdir $d; echo $d)
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fi)
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TO="$TMPDIR/to"; FROM="$TMPDIR/from"
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socat $SO1 fifo:$TO,nonblock,ignoreeof!!fifo:$FROM $method:$server:21,$addropts &
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S1=$!
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while ! [ -p "$TO" -a -p "$FROM" ]; do sleep 1; done
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exec 4>$TMPDIR/to 3<$TMPDIR/from
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trap "S1=" 17
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#trap "echo cleaning up...>&2; rm -r $TMPDIR; [ -n "$S1" ] && kill $S1" 0 3
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trap "rm -r $TMPDIR" 0 3
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### here the central part ends
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# this function waits for a complete server message, checks if its status
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# is in the permitted range (terminates session if not), and returns.
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ftp_chat () {
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local cmd="$1"
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local errlevel="$2"; [ -z "$errlevel" ] && errlevel=300
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if [ -n "$cmd" ]; then echo "$cmd" >&4; fi
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while read status message <&3;
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( case "$status" in [0-9][0-9][0-9]-*) exit 0;; [0-9][0-9][0-9]*) exit 1;; *) exit 1;; esac )
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do :; done
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#echo "got \"$status $message\"" >&2
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if [ -z "$status" ]; then echo ftp data connection failed >&2; exit; fi
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if [ "$status" -ge "$errlevel" ]; then
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echo $message >&2
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echo "QUIT" >&4; exit 1
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fi
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set +vx
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}
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# wait for server greeting
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ftp_chat
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ftp_chat "USER $user" 400
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ftp_chat "PASS $passwd"
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#ftp_chat "CWD $dir"
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case "$dir" in
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*/) ftp_chat "TYPE A" ;;
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*) ftp_chat "TYPE I" ;;
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esac
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echo "PASV" >&4; read status message <&3
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info=$(expr "$message" : '.*[^0-9]\([0-9]*,[0-9]*,[0-9]*,[0-9]*,[0-9]*,[0-9]*\).*')
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echo $info |tr ',' ' ' |(read i1 i2 i3 i4 p1 p2
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addr=$i1.$i2.$i3.$i4
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port=$(echo "256*$p1+$p2" |bc)
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#echo $addr:$port
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trap : 20
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# open data connection and transfer data
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socat -u $SO2 $method:$server:$port,$addropts -
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) &
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S2=$!
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case "$dir" in
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*/) ftp_chat "NLST $dir" ;;
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#*/) ftp_chat "LIST $dir" ;;
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*) ftp_chat "RETR $dir" ;;
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esac
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case "$status" in
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[45]*) kill $S2;;
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esac
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#echo "waiting for process $S2 to terminate" >&2
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wait $S2
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ftp_chat
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ftp_chat "QUIT"
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#echo "waiting for process $S1 to terminate" >&2
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wait $S1
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exit
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