From 874ea21685828f2c993b442d7a64087daa8fb290 Mon Sep 17 00:00:00 2001
From: tv <tv@krebsco.de>
Date: Tue, 5 Oct 2021 22:37:51 +0200
Subject: ircsink: initial commit

Mostly an import of irc-announce from stockholm 63b933c.
---
 bin/ircsink | 182 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 182 insertions(+)
 create mode 100755 bin/ircsink

(limited to 'bin')

diff --git a/bin/ircsink b/bin/ircsink
new file mode 100755
index 0000000..a86c183
--- /dev/null
+++ b/bin/ircsink
@@ -0,0 +1,182 @@
+#! /bin/sh
+#
+# ircsink - send stdin to IRC
+#
+# SYNOPSIS
+#   ircsink [--nick=NICK] [--port=PORT] [--secure]
+#           --server=SERVER --target=TARGET
+#
+#   ircsink --help
+#
+# DESCRIPTION
+#   ircsink sends lines from standard input to the specified IRC target.
+#
+#   --help
+#
+#   --nick=NICK (default: the system's host name)
+#
+#   --port=PORT (default: 6667, or 6697 if --secure is specified)
+#
+#   --secure
+#     If specified, then the connection will be made using openssl.
+#     Otherwise netcat will be used.
+#
+#   --server=SERVER
+#
+#   --target=TARGET
+#     The target for receiving PRIVMSGs.
+#     Can be either a channel's or a user's name.
+#
+
+set -efu
+
+main() {(
+
+  exec 3<&0
+
+  _args=$(getopt -n "$0" -s sh \
+      -l help,nick:,port:,secure,server:,target: \
+      -- "$0" "$@")
+  eval set -- "$_args"
+  unset _args
+
+  help=
+  nick=
+  port=
+  secure=
+  server=
+  target=
+  while :; do
+    case $1 in
+      --help) help=1; shift;;
+      --nick) nick=$2; shift 2;;
+      --port) port=$2; shift 2;;
+      --secure) secure=1; shift;;
+      --server) server=$2; shift 2;;
+      --target) target=$2; shift 2;;
+      --) shift; break;;
+    esac
+  done
+  case $# in
+    0) :;;
+    1) echo "$0: bad argument: $*" >&2; exit 1;;
+    *) echo "$0: bad arguments: $*" >&2; exit 1;;
+  esac
+
+  if test "$help" = 1; then
+    print_help
+    exit
+  fi
+
+  if test -t 3; then
+    echo "$0: error: ircsink cannot be used interactively" >&2
+    exit 1
+  fi
+
+  if test -z "$nick"; then
+    nick=$(hostname)
+  fi
+
+  if test -z "$port"; then
+    case $secure in
+      '') port=6667;;
+      1) port=6697;;
+      *)
+        echo "$0: missing argument: --port" >&2
+        exit 1
+        ;;
+    esac
+  fi
+
+  if test -z "$server"; then
+    echo "$0: missing argument: --server" >&2
+    exit 1
+  fi
+
+  if test -z "$target"; then
+    echo "$0: missing argument: --target" >&2
+    exit 1
+  fi
+
+  is_channel() {
+    case $1 in
+      \#*) :;;
+      *) ! :;;
+    esac
+  }
+
+  # echo2 and cat2 are used output to both, stdout and stderr
+  # This is used to see what we send to the irc server. (debug output)
+  echo2() { echo "$*"; echo "$*" >&2; }
+  cat2() {
+    awk '{
+      print $0
+      print $0 > "/dev/stderr"
+    }'
+  }
+
+  # privmsg_cat transforms stdin to a privmsg
+  privmsg_cat() {
+    awk -v target="$target" '{ print "PRIVMSG "target" :"$0 }'
+  }
+
+  ircat() {
+    if test "$secure" = 1; then
+      openssl s_client -connect "$server:$port"
+    else
+      nc "$server" "$port"
+    fi
+  }
+
+  # ircin is used to feed the output of netcat back to the "irc client"
+  # so we can implement expect-like behavior with sed^_^
+  # XXX mkselfdestructingtmpfifo would be nice instead of this cruft
+  tmpdir=$(mktemp --tmpdir -d ircsink_XXXXXXXX)
+  cd "$tmpdir"
+  mkfifo ircin
+  trap cleanup EXIT
+  cleanup() {
+    trap - EXIT
+    rm ircin
+    cd "$OLDPWD"
+    rmdir "$tmpdir"
+  }
+
+  {
+    echo2 "USER $LOGNAME 0 * :$LOGNAME@$(hostname)"
+    echo2 "NICK $nick"
+
+    awk 'match($0, /PING(.*)/, m) {print "PONG", m[1]; exit}'
+
+    # wait for MODE message
+    sed -n '/^:[^ ]* MODE /q'
+
+    if is_channel "$target"; then
+      echo2 "JOIN $target"
+    fi
+
+    privmsg_cat <&3 \
+      | cat2
+
+    if is_channel "$target"; then
+      echo2 "PART $target"
+
+      # wait for PART confirmation
+      sed -n '/:'"$nick"'![^ ]* PART /q'
+    fi
+
+    echo2 'QUIT :Gone to have lunch'
+  } < ircin \
+    | ircat | tee -a ircin
+)}
+
+print_help() {
+  sed -nr '
+    0,/^$/{
+      /^#!/d
+      s/^#($| )//p
+    }
+  ' "$0"
+}
+
+main "$@"
-- 
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