main.cpp

一个在LINUX环境中发包的小程序,其中的Make写的还可以,可复用

#include <unistd.h>
#include <sys/socket.h>
#include <stdio.h>
#include <arpa/inet.h>
#include <string.h>

 
int main()
{
	struct sockaddr_in servaddr;
	struct sockaddr_in clientaddr;
	int listenfd, connfd;
	char recvbuff[1024] = "";
	char sendbuff[1024] = "";
	int recvlen = 0;
	socklen_t len1 = 0;
	int i = 0;

	unsigned short type = 0x01;
	long long userid = 10021;
	long result = 0;
	unsigned short sendlen = 0;

	memset(&servaddr, 0, sizeof(servaddr ));
	memset(&clientaddr, 0, sizeof(clientaddr ));

	memcpy( sendbuff, &type, sizeof(type));
	sendlen += sizeof(type);
	memcpy( sendbuff + sendlen, &userid, sizeof(userid));
	sendlen += sizeof(userid);
	memcpy( sendbuff + sendlen, &result, sizeof(result));
	sendlen += sizeof(result);

	char buff[256] = "";
	unsigned char packtype = 0;
	bool needreply = 1;
	unsigned char nettype = 0;
	unsigned short packseri = 1;
	socklen_t len = 0;

	memcpy( buff, &sendlen, sizeof(sendlen));
	len += sizeof(sendlen);
	memcpy( buff + len, sendbuff, sendlen );
	len += sendlen;
	memcpy( buff + len, &packseri, sizeof( packseri));
	len += sizeof( packseri );
	memcpy( buff + len, &packtype, sizeof( packtype ));
	len += sizeof( packtype );
	memcpy( buff + len, &needreply, sizeof( needreply ));
	len += sizeof( needreply );
	memcpy( buff + len, &nettype, sizeof( nettype ));
	len += sizeof( nettype);


	listenfd = socket( AF_INET, SOCK_DGRAM, NULL );

	servaddr.sin_family = AF_INET;
	servaddr.sin_addr.s_addr = htonl(INADDR_ANY);
	servaddr.sin_port = htons(8812);

	if( bind(listenfd, (struct sockaddr*)&servaddr, sizeof(servaddr)) < 0 )
		return -1;
	listen(listenfd, 5);

	for(;;)
	{

	memcpy( buff + 16, & packseri, sizeof(packseri));
	packseri++;	
	//printf("begin to recv...\n");
	//	recvlen = recvfrom( listenfd, recvbuff, 1024, NULL, (struct sockaddr*)&clientaddr, &len1 );
	//	printf("my recv data, data len: %d\n", len1 );
	//	for(i = 0; i< recvlen; i++)
	//		printf("%02x ", recvbuff[i]);
	//
	//	printf("\nmy send data, data len: %d\n", len);

		for( i = 0; i < 100; i++ )
			printf("%02x ", buff[i]);
		clientaddr.sin_addr.s_addr = inet_addr("10.218.17.1");
		for(int lll = 0;lll < 100; lll++)
		{
			printf("\n send addr: %s\n", inet_ntoa( clientaddr.sin_addr ));
			
			if( sendto( listenfd, buff, 50, NULL, (struct sockaddr*)&clientaddr, len1 ) == -1 )
				clientaddr.sin_addr.s_addr++;
				printf("send error");
			printf("send over!!!\n");
			//sleep(1);
		}
	}

	return 0;
	
}