lua: implement "luaclient".

This allows for starting Lua scripts in neutrino context from the
command line. Experimental, not fully regression-tested.


Origin commit data
------------------
Branch: ni/coolstream
Commit: 5d25185684
Author: martii <m4rtii@gmx.de>
Date: 2014-10-13 (Mon, 13 Oct 2014)



------------------
This commit was generated by Migit

lib/luaclient/Makefile.am

@@ -0,0 +1,13 @@
+AM_CPPFLAGS = \
+	-I$(top_srcdir)/lib \
+	-I$(top_srcdir)/src \
+	-I$(top_srcdir)/lib/luaclient \
+	-I$(top_srcdir)/lib/connection
+
+AM_CPPFLAGS += -fno-rtti -fno-exceptions
+
+bin_PROGRAMS = luaclient
+
+luaclient_SOURCES = luaclient.cpp
+luaclient_LDADD = \
+	$(top_builddir)/lib/connection/libtuxbox-connection.a

lib/luaclient/luaclient.cpp

@@ -0,0 +1,110 @@
+/*
+	(C)2014 by martii
+
+	License: GPL
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#include <stdio.h>
+#include <string>
+#include <string.h>
+#include <stdlib.h>
+#include <basicclient.h>
+
+#include <luaclient.h>
+
+
+class CLuaClient : private CBasicClient
+{
+	private:
+		unsigned char   getVersion   () const { return LUACLIENT_VERSION; };
+		const    char * getSocketName() const { return LUACLIENT_UDS_NAME; };
+	public:
+		bool Send(const char *data, const size_t size) { return send(0, data, size);}
+		bool Recv(char *data, const size_t size) { return receive_data(data, size, true); }
+		~CLuaClient() { close_connection(); }
+};
+
+int main(int argc, char** argv)
+{
+	char *cmd = strrchr(argv[0], '/');
+	if (cmd)
+		cmd++;
+	else
+		cmd = argv[0];
+	if (!strcmp(cmd, "luaclient"))
+		argv++, argc--;
+
+	if (!*argv) {
+		fprintf(stderr,
+			"Usage: luaclient [command [arguments ...]]\n"
+			"   or: command [arguments ...] (with command being a link to luaclient)\n");
+		exit(-1);
+	}
+
+	size_t len[argc];
+	size_t size = 0;
+	for (int i = 0; i < argc; i++) {
+		len[i] = strlen(argv[i]) + 1;
+		size += len[i];
+	}
+
+	char data[size + sizeof(size)];
+	char *b = data;
+	memcpy(b, &size, sizeof(size));
+	size += sizeof(size);
+	b += sizeof(size);
+	for (int i = 0; i < argc; i++) {
+		memcpy(b, argv[i], len[i]);
+		b += len[i];
+	}
+
+	CLuaClient client;
+	int res = -1;
+	const char *fun = NULL;
+	char *resp = NULL;
+
+        if (!client.Send(data, size)) {
+		fun = "Send failed";
+		goto fail;
+	}
+        if (!client.Recv((char *)&size, sizeof(size))) {
+		fun = "Recv (1) failed";
+		goto fail;
+	}
+	char result[size];
+        if (!client.Recv(result, size)) {
+		fun = "Recv (2) failed";
+		goto fail;
+	}
+
+	if (result[size - 1]) {
+		fun = "unterminated result";
+		goto fail;
+	}
+	res = atoi(result);
+	resp = result + strlen(result) + 1;
+	if (resp < result + size)
+		printf("%s", resp);
+	resp += strlen(resp) + 1;
+	if (resp < result + size)
+		fprintf(stderr, "%s", resp);
+	exit(res);
+fail:
+	if (fun)
+		fprintf(stderr, "luaclient: %s.\n", fun);
+	exit(-1);
+}

lib/luaclient/luaclient.h

@@ -0,0 +1,25 @@
+/*
+	(C)2014 by martii
+
+	License: GPL
+
+	This program is free software; you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation; either version 2 of the License, or
+	(at your option) any later version.
+
+	This program is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with this program; if not, write to the Free Software
+	Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
+*/
+
+#ifndef __LUACLIENT__H__
+#define __LUACLIENT__H__
+#define LUACLIENT_UDS_NAME	"/tmp/luaclient.sock"
+#define LUACLIENT_VERSION	1
+#endif