Reddit: fix comments and some articles
[gofetch.git] / gopherd.sh
1 #!/bin/bash
2
3 # Note: bash is required, sh will fail to output anything to the client
4 # Probably related to interactions beteween & and output redirections
5 #
6 # It seems the timeout on netcat does not work when listening...
7 # So you will have to either kill the process or make a last connection
8 # (which will not be processed)
9
10 # $0 [prog] ([port])
11 # You can use the evironment variable $QUERY_STRING for the query
12
13 [ "$ADDR" = "" ] && ADDR=127.0.0.1
14 [ "$LOG" = "" ] && LOG=/tmp/gopher.service.err
15 [ "$PIDF" = "" ] && PIDF="`mktemp`"
16 [ "$TIMEOUT" = "" ] && TIMEOUT=10
17 [ "$MAXCON" = "" ] && MAXCON=1024
18
19 prog="$1"
20 port="$2"
21 defn="$3"
22 [ "$port" = "" ] && port=70
23
24 if [ "$prog" = "" ]; then
25 rm "$PIDF"
26 echo "Syntax: $0 [prog] ([port]) (default non-7)" >&2
27 echo ' You can use the evironment variable $QUERY_STRING for the query' >&2
28 echo ' The default port is 70' >&2
29 echo ' A default message for non-service (7) request can be given' >&2
30 echo ' A filename will be displayed, you can delete it to stop the service' >&2
31 echo ' (you still have to make a last connection on $port)' >&2
32 exit 1
33 fi
34
35 tmpd=`mktemp -t -d .gopher-service.XXXXXX`
36 if [ ! -d "$tmpd" ]; then
37 rm "$PIDF"
38 echo "Cannot create temporary directory, aborting..." >&2
39 exit 2
40 fi
41
42 echo "#!/bin/sh
43 # PID: $$
44 # PID File (this file): $PIDF
45 # You can stop the service by deleting this file then making a last
46 # connection (which will not be processed) to the service:
47 rm \"$PIDF\"
48 nc -q0 $ADDR $port 2>/dev/null </dev/null
49 " > "$PIDF"
50
51 chmod u+rx "$PIDF"
52
53 echo "$PIDF"
54
55 i=0
56 while [ -e "$PIDF" ]; do
57 i=`expr $i + 1`
58 [ $i -gt "$MAXCON" ] && i=1
59 fifo="$tmpd/fifo.$i"
60 rm -f "$fifo" 2>/dev/null
61 mkfifo "$fifo"
62 < "$fifo" nc -l -q0 -w"$TIMEOUT" "$ADDR" -p "$port" | (
63 if [ -e "$PIDF" ]; then
64 read -r query
65 selector="`echo "$query" | cut -f1 -d' ' | sed 's:[\r\n]::g'`"
66 query="`echo "$query" | cut -f2 -d' ' | sed 's:[\r\n]::g'`"
67 if [ "$query" = "" ]; then
68 if [ "$defn" = "" ]; then
69 echo "7Search $selector $ADDR $port"
70 else
71 echo "$defn"
72 fi
73 else
74 QUERY_STRING="$query" "$prog" 2>> "$LOG" &
75 fi
76 fi
77 ) > "$fifo"
78 done
79 rm -rf "$tmpd" 2>/dev/null
80