sending packets from solaris to Cygwin

[Nakul Haridas <Nakul dot Haridas at sli-institute dot ac dot uk>]

Hi,

The codes I have attached are similar to a eariler reported problem
References: 
<Pine.SOL.4.33.0112060615220.15529-100000@azure.engin.umich.edu>

However I have my program working either in Solaris or Cygwin only. If 
the server is on solaris and client on cygwin and vice versa , the 
packet is lost. I cant figure out what the problem could be. I have also put

memset(&su_addr, 0, sizeof(su_addr));    /* server addr info */
     su_addr.sin_family = AF_INET;
     su_addr.sin_port = htons(MYPORT);
     su_addr.sin_addr.s_addr = inet_addr(u_addr);

This should have solved the probelem but it didnt.
Could youhelp me in this regards.

With warm regards.

Nakul
/*
 * UDPclient.c -- a UDP socket client
 *
 * Solaris Build:
 *   >gcc UDPclient.c -lnsl -lsocket -lresolv -o UDPclient
 *
 * Invocation:
 *   >./UDPclient
 */

#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <arpa/inet.h>
#include <stdio.h>

#include "udp_ack.h"



int main(int argc, char *argv[])
{
  	int sfd,n,remaining,port,MYPORT;			/* the socket for communication */
  	struct sockaddr_in su_addr, m_addr;	/* s(erver) and m(y) addr data */
  	char buf[1024];
  	struct timeval tmo;
  	fd_set rset;
  	unsigned short plen;
	char *u_addr;
	
	
	switch (argc){
	case 1: printf("usage: code [port] [address]\n");
		printf("Taking default values port=3490 and address=127.0.0.1\n");
		MYPORT=3490;
		u_addr="127.0.0.1";
		break;
		
	case 2: port=atoi(argv[1]);
		printf("port is %d\n",port);
		if((port<3490) || (port>3499))
		{	
			printf("Port entered is not in range(3490-3499), taking default value\n");
			MYPORT=3490;
		}
		else MYPORT=port;
		printf("Taking default address=127.0.0.1\n");
		u_addr="127.0.0.1";
		break;
		
	default:port=atoi(argv[1]);
		printf("successful\n"); 
		MYPORT=port;
		u_addr=argv[2];
		break;
	}
		
	memset(&m_addr, 0, sizeof(m_addr));	/* my address information */
  	m_addr.sin_family = AF_INET;
  	m_addr.sin_port = htons(0);			/* 0 ==> assign me a port */
  	m_addr.sin_addr.s_addr = htonl(INADDR_ANY);

  	memset(&su_addr, 0, sizeof(su_addr));	/* server addr info */
  	su_addr.sin_family = AF_INET;
  	su_addr.sin_port = htons(MYPORT);
  	su_addr.sin_addr.s_addr = inet_addr(u_addr);

	printf("Ready to Transmit Data to server \n");
	printf("Server details:ADDRESS: %s    PORT:%d\n",u_addr,MYPORT);
	printf("Client details:ADDRESS: %s    PORT:%d\n",inet_ntoa(m_addr.sin_addr),ntohs(m_addr.sin_port));
	printf("\nType your message here\n");	
	
/**** open the UDP socket */
  	if ((sfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 
	{
    		perror("socket");
    		return(-1);
  	}

/**** bind to local UDP port (randomly assigned) */
  	if (bind(sfd, (struct sockaddr *)&m_addr, sizeof(m_addr)) < 0) 
	{
    		perror("bind");
    		return(-1);
  	}

/**** send each line from stdin as a separate message to server */
  	while (fgets(buf, sizeof(buf), stdin) != NULL) 
	{
    		n = strlen(buf) + 1;	/* include the EOS! */
    		
    		sendto(sfd, buf, n, 0, (struct sockaddr *)&su_addr, sizeof(su_addr));
    
    		for (remaining = NRETRIES; remaining > 0; remaining--) 
		{
    			tmo.tv_sec = 0;
    			tmo.tv_usec = MSEC_TMO * 1000;
    			FD_ZERO(&rset);
    			FD_SET(sfd, &rset); 
    			if (select(sfd+1, &rset, NULL, NULL, &tmo) > 0)
			break;
      			sendto(sfd, buf, n, 0, (struct sockaddr *)&su_addr, sizeof(su_addr));
    		}
    
    		if (remaining <= 0) 
		{
    			perror("sendto");
      			return(-1);
    		}	
		if (recv(sfd, buf, sizeof(buf), 0) < 0) 
		{
      			perror("recv");
      			return(-1);
    		}
    		printf("Received: ");
   		fputs(buf, stdout);
  	}

/**** close the socket */
  	close(sfd);

}

/*
 * UDPechoserver.c -- a UDP socket server
 *
 * Solaris Build:
 *   >gcc UDPechoserver.c -lnln -lsocket -lresolv -o UDPechoserver
 *
 * Invocation:
 *   >./UDPechoserver >out.txt&
 */

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

int main(int argc, char *argv[])
{
  	int sfd;			/* the socket for communication */
  	int len, n, port,MYPORT,m=1;
  	struct sockaddr_in su_addr;	/* my s(erver) address data */
  	struct sockaddr_in c_addr;	/* c(lient) address data */
  	char buf[1024];

  
  	switch (argc){
	case 1: printf("usage: code [port] \n");
		printf("Taking default values port=3490\n");
		MYPORT=3490;
		break;
		
	case 2: port=atoi(argv[1]);
		printf("port is %d\n",port);
		if((port<3490) || (port>3499))
		{	
			printf("Port entered is not in range(3490-3499), taking default value\n");
			MYPORT=3490;
		}
		else MYPORT=port;
		break;
		
	default:port=atoi(argv[1]);
		printf("port is %d\n",port);
		MYPORT=port;
		m=strcmp(argv[2],"-v");
		if(m==0) printf("VERBOSE MODE\n");
		break;
	}
  	
	  
  	memset(&su_addr, 0, sizeof(su_addr));	/* my address info */
  	su_addr.sin_family = AF_INET;
  	su_addr.sin_port = htons(MYPORT);
  	su_addr.sin_addr.s_addr = htonl(INADDR_ANY);

/**** open the UDP socket */
  	if ((sfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) 
	{
    		perror("socket");
	    	return(-1);
  	}

/**** bind to my local port number */
  	if ((bind(sfd, (struct sockaddr *)&su_addr, sizeof(su_addr)) < 0)) 
	{
   		perror("bind");
	    	return(-1);
  	}

/**** receive each message on the socket, printing on stdout */
  	while (1) 
	{
    		memset(&c_addr, 0, sizeof(su_addr));
    		len = sizeof (c_addr);
    		n = recvfrom(sfd, buf, sizeof(buf), 0, (struct sockaddr *)&c_addr, &len);
    		if (n < 0) 
		{
      			perror("recvfrom");
      			return(-1);
    		}
    		
		if(m==0)printf("%s   %d  %s\n",inet_ntoa(c_addr.sin_addr),ntohs(c_addr.sin_port),buf);
		else	{	
			fputs(buf, stdout);
		    	fflush(stdout);
			}
		
		(void) sendto(sfd, buf, n, 0, (struct sockaddr *)&c_addr, len);
  	}
	
}

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