/*
 * Written by Darryl Dixon 08/05/2002, based upon modified code
 * from fpont 12/99; pont.net; udpClient.c
 * Program is designed to take two command line arguments and use
 * them to send a UDP packed to the appropriate socket to talk to a
 * POM server (Patrol Operations Manager)
 * pomsender.cpp
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <netdb.h>
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <sys/time.h>

#define REMOTE_SERVER_PORT 9561  /* POM listens on this UDP Port for a correctly formatted string... */

int main(int argc, char *argv[])
{

	char headerString[7] = "EXMGC.";
	char completeString[512] = "";
	int sd, rc;
	struct sockaddr_in cliAddr, remoteServAddr;
	struct hostent *host;
	char *headerPtr;
	char *completePtr;
	headerPtr = headerString;
	completePtr = completeString;

	/* First check command line arguments */
	if (argc != 3)
	{
		printf("usage : %s <POMserver> \"<message>\"\n", argv[0]);
		exit(1);
	}

	/* Now we get the POM server IP address */
	host = gethostbyname(argv[1]);
	if (host == NULL)
	{
		printf("%s: unknown host '%s'... Perhaps try using an IP address instead.\n", argv[0], argv[1]);
		exit(1);
	}

	/* Now we need to create the data packet to send: */
	remoteServAddr.sin_family = host->h_addrtype;
	memcpy((char *) &remoteServAddr.sin_addr.s_addr, host->h_addr_list[0], host->h_length);
	remoteServAddr.sin_port = htons(REMOTE_SERVER_PORT);  /* 9561 UDP for POM */

	/* Next create the socket we are going to send from: */
	sd = socket(AF_INET,SOCK_DGRAM,0); /* SOCK_DGRAM as opposed to SOCK_STREAM... */
	if (sd < 0)
	{
		printf("%s: cannot open socket.\n",argv[0]);
		exit(1);
	}

	/* Bind a port to send from (we'll take whatever we can get :) */
	cliAddr.sin_family = AF_INET;
	cliAddr.sin_addr.s_addr = htonl(INADDR_ANY);
	cliAddr.sin_port = htons(0);

	rc = bind(sd, (struct sockaddr *) &cliAddr, sizeof(cliAddr));
	if (rc < 0)
	{
		printf("%s: cannot bind a port.\n", argv[0]);
		exit(1);
	}

	/* Let's create the string that we're going to send now: */
	strncat(completePtr, headerPtr, 7);
	strncat(completePtr, argv[2], 505);

	/* Now finally we can send the data: */
	rc = sendto(sd, completeString, strlen(completeString)+1, 0, (struct sockaddr *) &remoteServAddr, sizeof(remoteServAddr));
	if (rc < 0)
	{
		printf("%s: cannot send data %s\n",argv[0],argv[2]);
		close(sd);
		exit(1);
	}

	return EXIT_SUCCESS;
}