nexmon – Blame information for rev 1
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| Rev | Author | Line No. | Line |
|---|---|---|---|
| 1 | office | 1 | #! /bin/bash |
| 2 | # source: socks4echo.sh |
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| 3 | |||
| 4 | # Copyright Gerhard Rieger 2004-2006 |
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| 5 | # Published under the GNU General Public License V.2, see file COPYING |
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| 6 | |||
| 7 | # perform primitive simulation of a socks4 server with echo function via stdio. |
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| 8 | # accepts and answers correct SOCKS4 requests, but then just echoes data. |
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| 9 | # it is required for test.sh |
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| 10 | # for TCP, use this script as: |
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| 11 | # socat tcp-l:1080,reuseaddr,crlf system:"socks4echo.sh" |
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| 12 | |||
| 13 | # older bash and ksh do not have -n option to read command; we try dd then |
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| 14 | if echo a |read -n 1 null >/dev/null 2>&1; then |
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| 15 | HAVE_READ_N=1 |
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| 16 | else |
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| 17 | HAVE_READ_N= |
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| 18 | fi |
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| 19 | |||
| 20 | if type socat >/dev/null 2>&1; then |
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| 21 | SOCAT=socat |
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| 22 | else |
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| 23 | SOCAT=./socat |
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| 24 | fi |
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| 25 | |||
| 26 | case `uname` in |
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| 27 | HP-UX|OSF1) |
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| 28 | CAT="$SOCAT -u stdin stdout" |
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| 29 | ;; |
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| 30 | *) |
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| 31 | CAT=cat |
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| 32 | ;; |
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| 33 | esac |
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| 34 | |||
| 35 | if [ $(echo "x\c") = "x" ]; then E="" |
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| 36 | elif [ $(echo -e "x\c") = "x" ]; then E="-e" |
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| 37 | else |
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| 38 | echo "cannot suppress trailing newline on echo" >&2 |
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| 39 | exit 1 |
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| 40 | fi |
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| 41 | ECHO="echo $E" |
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| 42 | |||
| 43 | if [ $($ECHO "\0101") = "A" ]; then |
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| 44 | SOCKSREPLY_FAILED="\0\0133\0\0\0\0\0\0\c" |
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| 45 | SOCKSREPLY_OK="\0\0132\0\0\0\0\0\0\c" |
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| 46 | else |
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| 47 | SOCKSREPLY_FAILED="\0\133\0\0\0\0\0\0\c" |
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| 48 | SOCKSREPLY_OK="\0\132\0\0\0\0\0\0\c" |
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| 49 | fi |
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| 50 | |||
| 51 | # read and parse SOCKS4 header |
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| 52 | if [ "$HAVE_READ_N" ]; then |
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| 53 | read -r -n 1 vn # bash 2.0.3 does not support -n |
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| 54 | else |
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| 55 | vn=$(dd bs=1 count=1 2>/dev/null) |
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| 56 | fi |
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| 57 | if [ "$vn" != $($ECHO "\04") ]; then |
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| 58 | $ECHO "$SOCKSREPLY_FAILED" |
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| 59 | echo "invalid socks version requested" >&2 |
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| 60 | exit |
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| 61 | fi |
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| 62 | |||
| 63 | if [ "$HAVE_READ_N" ]; then |
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| 64 | read -r -n 1 cd |
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| 65 | else |
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| 66 | cd=$(dd bs=1 count=1 2>/dev/null) |
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| 67 | fi |
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| 68 | if [ "$cd" != $($ECHO "\01") ]; then |
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| 69 | $ECHO "$SOCKSREPLY_FAILED" |
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| 70 | echo "invalid socks operation requested" >&2 |
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| 71 | exit |
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| 72 | fi |
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| 73 | |||
| 74 | if [ "$HAVE_READ_N" ]; then |
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| 75 | read -r -n 6 a |
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| 76 | else |
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| 77 | a=$(dd bs=1 count=6 2>/dev/null) |
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| 78 | fi |
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| 79 | if [ "$a" != "$($ECHO "}m bL6")" ]; then |
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| 80 | $ECHO "$SOCKSREPLY_FAILED" |
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| 81 | echo "$0: wrong socks address or port requested" >&2 |
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| 82 | echo "$0: expected $($ECHO "}m bL6"|od -t x1), received $($ECHO "$a"|od -t x1)" >&2 |
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| 83 | exit |
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| 84 | fi |
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| 85 | |||
| 86 | if [ "$HAVE_READ_N" ]; then |
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| 87 | read -r -n 7 u |
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| 88 | else |
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| 89 | u=$(dd bs=1 count=7 2>/dev/null) |
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| 90 | fi |
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| 91 | if [ "$u" != "nobody" ]; then |
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| 92 | $ECHO "$SOCKSREPLY_FAILED" |
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| 93 | echo "wrong socks user requested" >&2 |
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| 94 | exit |
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| 95 | fi |
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| 96 | |||
| 97 | # send ok status |
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| 98 | $ECHO "$SOCKSREPLY_OK" |
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| 99 | |||
| 100 | # perform echo function |
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| 101 | $CAT |