nexmon – Blame information for rev 1
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | office | 1 | #! /bin/bash |
| 2 | # source: socks4a-echo.sh |
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| 3 | #set -vx |
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| 4 | |||
| 5 | # Copyright Gerhard Rieger 2004 |
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| 6 | # Published under the GNU General Public License V.2, see file COPYING |
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| 7 | |||
| 8 | # perform primitive simulation of a socks4a server with echo function via stdio. |
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| 9 | # accepts and answers correct SOCKS4a requests, but then just echoes data. |
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| 10 | # it is required for test.sh |
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| 11 | # for TCP, use this script as: |
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| 12 | # socat tcp-l:1080,reuseaddr,crlf system:"socks4a-echo.sh" |
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| 13 | |||
| 14 | # older bash and ksh do not have -n option to read command; we try dd then |
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| 15 | if echo a |read -n 1 null >/dev/null 2>&1; then |
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| 16 | HAVE_READ_N=1 |
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| 17 | else |
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| 18 | HAVE_READ_N= |
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| 19 | fi |
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| 20 | |||
| 21 | if type socat >/dev/null 2>&1; then |
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| 22 | SOCAT=socat |
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| 23 | else |
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| 24 | SOCAT=./socat |
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| 25 | fi |
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| 26 | |||
| 27 | case `uname` in |
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| 28 | HP-UX|OSF1) |
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| 29 | CAT="$SOCAT -u stdin stdout" |
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| 30 | ;; |
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| 31 | *) |
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| 32 | CAT=cat |
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| 33 | ;; |
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| 34 | esac |
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| 35 | |||
| 36 | if [ $(echo "x\c") = "x" ]; then E="" |
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| 37 | elif [ $(echo -e "x\c") = "x" ]; then E="-e" |
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| 38 | else |
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| 39 | echo "cannot suppress trailing newline on echo" >&2 |
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| 40 | exit 1 |
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| 41 | fi |
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| 42 | ECHO="echo $E" |
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| 43 | |||
| 44 | if [ $($ECHO "\0101") = "A" ]; then |
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| 45 | SOCKSREPLY_FAILED="\0\0133\0\0\0\0\0\0\c" |
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| 46 | SOCKSREPLY_OK="\0\0132\0\0\0\0\0\0\c" |
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| 47 | else |
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| 48 | SOCKSREPLY_FAILED="\0\133\0\0\0\0\0\0\c" |
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| 49 | SOCKSREPLY_OK="\0\132\0\0\0\0\0\0\c" |
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| 50 | fi |
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| 51 | |||
| 52 | # read and parse SOCKS4a header |
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| 53 | if [ "$HAVE_READ_N" ]; then |
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| 54 | read -r -n 1 vn # bash 2.0.3 does not support -n |
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| 55 | else |
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| 56 | vn=$(dd bs=1 count=1 2>/dev/null) |
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| 57 | fi |
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| 58 | if [ "$vn" != $($ECHO "\04") ]; then |
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| 59 | $ECHO "$SOCKSREPLY_FAILED" |
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| 60 | echo "invalid socks version requested" >&2 |
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| 61 | exit |
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| 62 | fi |
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| 63 | |||
| 64 | if [ "$HAVE_READ_N" ]; then |
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| 65 | read -r -n 1 cd |
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| 66 | else |
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| 67 | cd=$(dd bs=1 count=1 2>/dev/null) |
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| 68 | fi |
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| 69 | if [ "$cd" != $($ECHO "\01") ]; then |
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| 70 | $ECHO "$SOCKSREPLY_FAILED" |
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| 71 | echo "invalid socks operation requested" >&2 |
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| 72 | exit |
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| 73 | fi |
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| 74 | |||
| 75 | a=$(dd bs=1 count=6 2>/dev/null) |
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| 76 | #echo a a a >/dev/tty |
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| 77 | #echo "$a" |od -c >/dev/tty |
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| 78 | #$ECHO "$a" |od -c >/dev/tty |
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| 79 | #echo>/dev/tty |
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| 80 | #echo a a a >/dev/tty |
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| 81 | if [ "$a" != "$($ECHO "}m\0\0\0\01")" ]; then |
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| 82 | sleep 1 |
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| 83 | $ECHO "$SOCKSREPLY_FAILED" |
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| 84 | echo "wrong socks address or port requested" >&2 |
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| 85 | exit |
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| 86 | fi |
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| 87 | |||
| 88 | if [ "$HAVE_READ_N" ]; then |
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| 89 | read -r -n 7 u |
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| 90 | else |
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| 91 | u=$(dd bs=1 count=7 2>/dev/null) |
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| 92 | fi |
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| 93 | if [ "$u" != "nobody" ]; then |
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| 94 | $ECHO "$SOCKSREPLY_FAILED" |
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| 95 | echo "wrong socks user requested" >&2 |
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| 96 | exit |
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| 97 | fi |
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| 98 | |||
| 99 | if [ "$HAVE_READ_N" ]; then |
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| 100 | read -r -n 10 h |
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| 101 | else |
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| 102 | h=$(dd bs=1 count=10 2>/dev/null) |
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| 103 | fi |
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| 104 | if [ "$h" != "localhost" ]; then |
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| 105 | $ECHO "$SOCKSREPLY_FAILED" |
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| 106 | echo "wrong socks address requested" >&2 |
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| 107 | exit |
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| 108 | fi |
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| 109 | |||
| 110 | # send ok status |
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| 111 | $ECHO "$SOCKSREPLY_OK" |
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| 112 | |||
| 113 | # perform echo function |
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| 114 | $CAT |