/*  Copyright 1999 Peter Schlaile.
 *  Copyright 1999-2002,2006,2007,2009 Alain Knaff.
 *  This file is part of mtools.
 *
 *  Mtools 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 3 of the License, or
 *  (at your option) any later version.
 *
 *  Mtools 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 Mtools.  If not, see <http://www.gnu.org/licenses/>.
 *
 * Small install-test utility to check if a floppyd-server is running on the
 * X-Server-Host.
 *
 * written by:
 *
 * Peter Schlaile
 *
 * udbz@rz.uni-karlsruhe.de
 *
 */

#include "sysincludes.h"
#include "stream.h"
#include "mtools.h"
#include "floppyd_io.h"

#ifdef USE_FLOPPYD
#include <sys/socket.h>
#include <arpa/inet.h>
#include <netdb.h>

/* ######################################################################## */

static const char* AuthErrors[] = {
	"Auth success!",
	"Auth failed: Packet oversized!",
	"Auth failed: X-Cookie doesn't match!",
	"Auth failed: Wrong transmission protocol version!",
	"Auth failed: Device locked!"
};

#include "byte_dword.h"
#include "read_dword.h"

static int write_dword(int handle, Dword parm)
{
	Byte val[4];

	dword2byte(parm, val);

	if(write(handle, val, 4) < 4)
		return -1;
	return 0;
}


/* ######################################################################## */

static uint32_t authenticate_to_floppyd(char fullauth, int sock, char *display,
					uint32_t protoversion)
{
	uint32_t filelen=0;
	Byte buf[16];
	const char *command[] = { "xauth", "xauth", "extract", "-", 0, 0 };
	char *xcookie = NULL;
	Dword errcode;
	uint32_t bytesRead;
	uint32_t cap=0;

	if (fullauth) {
		command[4] = display;

		filelen=(uint32_t)strlen(display);
		filelen += 100;

		xcookie = (char *) safe_malloc(filelen+4);
		filelen = (uint32_t) safePopenOut(command, xcookie+4, filelen);
		if(filelen < 1)
		    return AUTH_AUTHFAILED;
	}
	dword2byte(4,buf);
	dword2byte(protoversion,buf+4);
	if(write(sock, buf, 8) < 8)
		return AUTH_IO_ERROR;

	bytesRead = read_dword(sock);

	if (bytesRead != 4 && bytesRead != 12) {
		return AUTH_WRONGVERSION;
	}


	errcode = read_dword(sock);

	if (errcode != AUTH_SUCCESS) {
		return errcode;
	}

	protoversion = FLOPPYD_PROTOCOL_VERSION_OLD;
	if(bytesRead >= 12) {
	    protoversion = read_dword(sock);
	    cap = read_dword(sock);
	}

	fprintf(stderr, "Protocol Version=%d\n", protoversion);
	if(protoversion >= FLOPPYD_PROTOCOL_VERSION) {
	  fprintf(stderr, "Capabilities:%s%s\n",
		  (cap & FLOPPYD_CAP_EXPLICIT_OPEN) ? " ExplicitOpen" : "",
		  (cap & FLOPPYD_CAP_LARGE_SEEK) ? " LargeFiles" : "");
	}

	if (fullauth) {
		dword2byte(filelen, (Byte *) xcookie);
		if(write(sock, xcookie, filelen+4) < (ssize_t)(filelen+4))
			return AUTH_IO_ERROR;

		if (read_dword(sock) != 4) {
			return AUTH_PACKETOVERSIZE;
		}

		errcode = read_dword(sock);
	}

	return errcode;

}


/* ######################################################################## */

static int get_host_and_port(const char* name, char** hostname, char **display,
			     uint16_t* port)
{
	char* newname = strdup(name);
	char* p;
	char* p2;

	p = newname;
	while (*p != '/' && *p) p++;
	p2 = p;
	if (*p) p++;
	*p2 = 0;

	*port = atou16(p);
	if (*port == 0) {
		*port = FLOPPYD_DEFAULT_PORT;
	}

	*display = strdup(newname);

	p = newname;
	while (*p != ':' && *p) p++;
	p2 = p;
	if (*p) p++;
	*p2 = 0;

	*port += atoi(p);  /* add display number to the port */

	if (!*newname || strcmp(newname, "unix") == 0) {
		free(newname);
		newname = strdup("localhost");
	}

	*hostname = newname;
	return 1;
}

/*
 *  * Return the IP address of the specified host.
 *  */
static in_addr_t getipaddress(char *ipaddr)
{

	struct hostent  *host;
	in_addr_t        ip;

	if (((ip = inet_addr(ipaddr)) == INADDR_NONE) &&
	    (strcmp(ipaddr, "255.255.255.255") != 0)) {

		if ((host = gethostbyname(ipaddr)) != NULL) {
			memcpy(&ip, host->h_addr, sizeof(ip));
		}

		endhostent();
	}

#ifdef DEBUG
	fprintf(stderr, "IP lookup %s -> 0x%08lx\n", ipaddr, ip);
#endif

	return (ip);
}

/*
 *  * Connect to the floppyd server.
 *  */
static int connect_to_server(in_addr_t ip, uint16_t port)
{

	struct sockaddr_in      addr;
	int                     sock;

	/*
	 * Allocate a socket.
	 */
	if ((sock = socket(AF_INET, SOCK_STREAM, 0)) < 0) {
		return (-1);
	}

	/*
	 * Set the address to connect to.
	 */

	addr.sin_family = AF_INET;
	addr.sin_port = htons(port);
	addr.sin_addr.s_addr = ip;

        /*
	 * Connect our socket to the above address.
	 */
	if (connect(sock, (struct sockaddr *)&addr, sizeof(addr)) < 0) {
		return (-1);
	}

        /*
	 * Set the keepalive socket option to on.
	 */
	{
		int             on = 1;
		setsockopt(STDIN_FILENO, SOL_SOCKET, SO_KEEPALIVE,
			   (char *)&on, sizeof(on));

	}

	return (sock);
}

int main (int argc, char** argv)
{
	char* hostname;
	char* display;
	char* name;
	uint16_t port;
	int sock;
	uint32_t reply;
	int rval;
	uint32_t protoversion;
	char fullauth = 0;
	Byte opcode = OP_CLOSE;

        if (argc < 2) {
	       puts("Usage: floppyd_installtest [-f] Connect-String\n"
		    "-f\tDo full X-Cookie-Authentication");
	       return -1;
	}

	name = argv[1];
	if (strcmp(name, "-f") == 0) {
		fullauth = 1;
		name = argv[2];
	}

	rval = get_host_and_port(name, &hostname, &display, &port);

	if (!rval) return -1;

	sock = connect_to_server(getipaddress(hostname), port);

	if (sock == -1) {
		fprintf(stderr,
			"Can't connect to floppyd server on %s, port %i!\n",
			hostname, port);
		return -1;
	}

	protoversion = FLOPPYD_PROTOCOL_VERSION;
	while(1) {
	    reply = authenticate_to_floppyd(fullauth, sock, display,
					    protoversion);
	    if(protoversion == FLOPPYD_PROTOCOL_VERSION_OLD)
		break;
	    if(reply == AUTH_WRONGVERSION) {
		/* fall back on old version */
		protoversion = FLOPPYD_PROTOCOL_VERSION_OLD;
		continue;
	    }
	    break;
	}

	if (reply != 0) {
		fprintf(stderr,
			"Connection to floppyd failed:\n"
			"%s\n", AuthErrors[reply]);
		return -1;
	}

	free(hostname);
	free(display);

	if(write_dword(sock, 1) < 0) {
		fprintf(stderr,
			"Short write to floppyd:\n"
			"%s\n", strerror(errno));
	}

	if(write(sock, &opcode, 1) < 0) {
		fprintf(stderr,
			"Short write to floppyd:\n"
			"%s\n", strerror(errno));
	}

	close(sock);

	return 0;
}
#endif