udp_packet_sender.c

#include	<sys/types.h>
#include	<sys/socket.h>
#include	<netinet/in.h>	
#include	<arpa/inet.h>
#include	<errno.h>
#include	<fcntl.h>
#include	<netdb.h>
#include	<signal.h>
#include	<stdio.h>
#include	<stdlib.h>
#include	<string.h>
#include	<sys/stat.h>
#include	<sys/uio.h>
#include	<unistd.h>
#include	<sys/wait.h>
#include	<sys/un.h>
#include	<ifaddrs.h>
#include	<stdint.h>
int main(int argc, char **argv)
{
	int sendfd,recvfd;
	struct sockaddr_in servaddr,local,cliaddr;
	socklen_t cliaddrlen = sizeof(cliaddr);
	char sendline[65535],recvline[65535];
	if (argc != 2)
	{
		printf("usage: udp_packet_sender <IPaddress>\n");
		return -1;
	}
	bzero(&servaddr, sizeof(servaddr));
	servaddr.sin_family = AF_INET;
	servaddr.sin_port = htons(5202);
	inet_pton(AF_INET, argv[1], &servaddr.sin_addr);

	local.sin_family = AF_INET;
	local.sin_port = htons(2152);
	local.sin_addr.s_addr = htonl(INADDR_ANY);

	sendfd = socket(AF_INET, SOCK_DGRAM, 0);
	while (fgets(sendline, 65535, stdin) != NULL) {
		
		sendto(sendfd, sendline, strlen(sendline), 0, (struct sockaddr*)&servaddr, sizeof(servaddr));
		printf("packet send\n");
		recvfd = socket(AF_INET, SOCK_DGRAM, 0);
		bind(recvfd,(struct sockaddr*)&local,sizeof(local));	
		recvfrom(recvfd,recvline,65535,0,(struct sockaddr*)&cliaddr, &cliaddrlen);
	}
	exit(0);
}