gopher.sh

   1 #!/bin/sh
   2
   3 # $0 [prog ($1 will be the query)] ([port])
   4
   5 [ "$ADDR"    = "" ] && ADDR=127.0.0.1
   6 [ "$LOG"     = "" ] && LOG=/tmp/log.err
   7 [ "$PIDF"    = "" ] && PIDF="`mktemp`"
   8 [ "$TIMEOUT" = "" ] && TIMEOUT=10
   9 [ "$MAXCON"  = "" ] && MAXCON=1024
  10 prog="$1"
  11 port="$2"
  12 [ "$port"    = "" ] && port=70
  13
  14 if [ "$prog" = "" ]; then
  15         rm "$PIDF"
  16         echo "Syntax: $0 [prog (\$1 will be the query)] ([port])" >&2
  17         exit 1
  18 fi
  19
  20 tmpd=`mktemp -t -d .gopher-service.XXXXXX`
  21 if [ ! -d "$tmpd" ]; then
  22         rm "$PIDF"
  23         echo "Cannot create temporary directory, aborting..." >&2
  24         exit 2
  25 fi
  26
  27 touch "$PIDF"
  28 echo "$PIDF"
  29
  30 i=0
  31 while [ -e "$PIDF" ]; do
  32         i=`expr $i + 1`
  33         [ $i -gt "$MAXCON" ] && i=1
  34         fifo="$tmpd/fifo.$i"
  35         rm -f "$fifo"
  36         mkfifo "$fifo"
  37         < "$fifo" nc -l -q0 -w"$TIMEOUT" "$ADDR" -p "$port" | (
  38                 read -r query
  39                 query="`echo "$query" | cut -f2 -d'     '`"
  40                 (
  41                         "$prog" "$query" 2>> "$LOG"
  42                         rm "$fifo"
  43                 )&
  44         ) > "$fifo"
  45 done
  46 rm -rf "$tmpd"
  47