socket组播出现的问题记录

这个程序需要绑定两个端口：

1.通过端口复用的方法，绑定同一个端口；

2.接收和发送用不同的端口，在发送函数填入组播地址和发送端的端口号。

/*加载库文件*/
#pragma comment( lib, "ws2_32.lib" )
/*加载头文件*/
#include <winsock2.h>
#include <ws2tcpip.h>
#include <stdio.h>
#include <stdlib.h>

/*定义多播常量*/
#define MCASTADDR     "224.3.5.8"
#define MCASTPORT     25000
#define BUFSIZE       1024
#define MCOUNT        10

/*定义广播常量*/
#define BCASTPORT     5050
#define BCOUNT        10

/*定义广播全局变量*/
SOCKET             socketBro;
SOCKET             socketRec;
struct sockaddr_in addrBro;
struct sockaddr_in addrRec;
BOOL               broadSendFlag;
BOOL               broadFlag;

DWORD              bCount;
DWORD              bcastAddr;
short              bPort;

/*定义多播全局变量*/
SOCKET             socketMul;
SOCKET             sockJoin;
struct sockaddr_in addrLocal;
struct sockaddr_in addrMul;

BOOL               multiSendFlag;
BOOL               bLoopBack;
BOOL               multiFlag;

DWORD              dwInterface;
DWORD              dwMulticastGroup;
DWORD              mCount;
short              mPort;

/*自定义函数*/
void initial();
void GetArgments(int argc, char **argv);

void userHelpAll();
void userHelpBro();
void userHelpMul();

void broadcastSend();
void broadcastRec();

void mulControl();
void multicastSend();
void multicastRec();

/*初始化全局变量函数*/
void initial()
{
	/*初始化广播全局变量*/
	bPort = BCASTPORT;
	bCount = BCOUNT;
	bcastAddr = INADDR_BROADCAST;
	broadSendFlag = FALSE;
	broadFlag = FALSE;
	multiFlag = FALSE;

	/*初始化多播全局变量*/
	dwInterface = INADDR_ANY;
	dwMulticastGroup = inet_addr(MCASTADDR);
	mPort = MCASTPORT;
	mCount = MCOUNT;
	multiSendFlag = FALSE;
	bLoopBack = FALSE;
}

/*参数获取函数*/
void GetArgments(int argc, char **argv)
{
	int i;
	/*如果参数个数小于2个*/
	if (argc <= 1)
	{
		userHelpAll();
		return;
	}
	/*获取广播选项*/
	if (argv[1][0] == '-'&&argv[1][1] == 'b')
	{
		/*广播标志设置为真*/
		broadFlag = TRUE;
		for (i = 2; i < argc;i++)
		{
			if (argv[i][0] == '-')
			{
				switch (tolower(argv[i][1]))
				{
					/*如果是发送者*/
				case 's':
					broadSendFlag = TRUE;
					break;
					/*广播的地址*/
				case 'h':
					if (strlen(argv[i]) > 3)
						bcastAddr = inet_addr(&argv[i][3]);
					break;
					/*广播的端口号*/
				case 'p':
					if (strlen(argv[i]) > 3)
						bPort = atoi(&argv[i][3]);
					break;
					/*广播(接收或者发送)的数量*/
				case 'n':
					bCount = atoi(&argv[i][3]);
					break;
					/*其他情况显示用户帮助，终止程序*/
				default:
				{
					userHelpBro();
					ExitProcess(-1);
				}
				break;
				}
			}
		}
		return;
	}

	/*获取多播选项*/
	if (argv[1][0] == '-'&&argv[1][1] == 'm')
	{
		/*多播标志设置为真*/
		multiFlag = TRUE;
		for (i = 2; i < argc;i++)
		{
			if (argv[i][0] == '-')
			{
				switch (tolower(argv[i][1]))
				{
					/*如果是发送者*/
				case 's':
					multiSendFlag = TRUE;
					break;
					/*多播地址*/
				case 'h':
					if (strlen(argv[i]) > 3)
						dwMulticastGroup = inet_addr(&argv[i][3]);
					break;
					/*本地接口地址*/
				case 'i':
					if (strlen(argv[i]) > 3)
						dwInterface = inet_addr(&argv[i][3]);
					break;
					/*多播端口号*/
				case 'p':
					if (strlen(argv[i]) > 3)
						mPort = atoi(&argv[i][3]);
					break;
					/*环回标志设置为真*/
				case 'l':
					bLoopBack = TRUE;
					break;
					/*发送(接收)的数量*/
				case 'n':
					mCount = atoi(&argv[i][3]);
					break;
					/*其他情况，显示用户帮助，终止程序*/
				default:
					userHelpMul();
					break;
				}
			}
		}

	}
	return;
}

/*全局用户帮助函数*/
void userHelpAll()
{
	printf("Please choose broadcast[-b] or multicast[-m] !\n");
	printf("userHelpAll: -b [-s][p][-h][-n] | -m[-s][-h][-p][-i][-l][-n]\n");
	userHelpBro();
	userHelpMul();
}

/*广播用户帮助函数*/
void userHelpBro()
{
	printf("Broadcast: -b -s:str -p:int -h:str -n:int\n");
	printf("           -b     Start the broadcast program.\n");
	printf("           -s     Act as server (send data); otherwise\n");
	printf("                  receive data. Default is receiver.\n");
	printf("           -p:int Port number to use\n ");
	printf("                  The default port is 5050.\n");
	printf("           -h:str The decimal broadcast IP address.\n");
	printf("           -n:int The Number of messages to send/receive.\n");
	printf("                  The default number is 10.\n");
}

/*多播用户帮助函数*/
void userHelpMul()
{
	printf("Multicast: -m -s -h:str -p:int -i:str -l -n:int\n");
	printf("           -m     Start the multicast program.\n");
	printf("           -s      Act as server (send data); otherwise\n");
	printf("                   receive data. Default is receiver.\n");
	printf("           -h:str  The decimal multicast IP address to join\n");
	printf("                   The default group is: %s\n", MCASTADDR);
	printf("           -p:int  Port number to use\n");
	printf("                   The default port is: %d\n", MCASTPORT);
	printf("           -i:str  Local interface to bind to; by default \n");
	printf("                   use INADDRY_ANY\n");
	printf("           -l      Disable loopback\n");
	printf("           -n:int  Number of messages to send/receive\n");
	ExitProcess(-1);
}

/*广播消息发送函数*/
void broadcastSend()
{
	/*设置广播的消息*/
	char *smsg = "The message received is from sender!";
	BOOL opt = TRUE;
	int nlen = sizeof(addrBro);
	int ret;
	DWORD i = 0;

	/*创建UDP套接字*/
	socketBro = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0, WSA_FLAG_OVERLAPPED);
	/*如果创建失败*/
	if (socketBro == INVALID_SOCKET)
	{
		printf("Create socket failed:%d\n", WSAGetLastError());
		WSACleanup();
		return;
	}

	/*设置广播地址各个选项*/
	addrBro.sin_family = AF_INET;
	addrBro.sin_addr.s_addr = bcastAddr;
	addrBro.sin_port = htons(bPort);

	/*设置该套接字为广播类型*/
	if (setsockopt(socketBro, SOL_SOCKET, SO_BROADCAST, (char FAR *)&opt,
		sizeof(opt)) == SOCKET_ERROR)
		/*如果设置失败*/
	{
		printf("setsockopt failed:%d", WSAGetLastError());
		closesocket(socketBro);
		WSACleanup();
		return;
	}
	/*循环发送消息*/
	while (i<bCount)
	{
		/*延迟1秒*/
		Sleep(1000);
		/*从广播地址发送消息*/
		ret = sendto(socketBro, smsg, 256, 0, (struct sockaddr*)&addrBro, nlen);
		/*如果发送失败*/
		if (ret == SOCKET_ERROR)
			printf("Send failed:%d", WSAGetLastError());
		/*如果发送成功*/
		else
		{
			printf("Send message %d!\n", i);
		}
		i++;
	}
	/*发送完毕后关闭套接字、释放占用资源*/
	closesocket(socketBro);
	WSACleanup();
}

/*广播消息接收函数*/
void broadcastRec()
{
	BOOL optval = TRUE;
	int addrBroLen;
	char buf[256];
	DWORD i = 0;
	/*该地址用来绑定套接字*/
	addrRec.sin_family = AF_INET;
	addrRec.sin_addr.s_addr = 0;
	addrRec.sin_port = htons(bPort);

	/*该地址用来接收网路上广播的消息*/
	addrBro.sin_family = AF_INET;
	addrBro.sin_addr.s_addr = bcastAddr;
	addrBro.sin_port = htons(bPort);

	addrBroLen = sizeof(addrBro);
	//创建UDP套接字
	socketRec = socket(AF_INET, SOCK_DGRAM, 0);
	/*如果创建失败*/
	if (socketRec == INVALID_SOCKET)
	{
		printf("Create socket error:%d", WSAGetLastError());
		WSACleanup();
		return;
	}

	/*设置该套接字为可重用类型*/
	if (setsockopt(socketRec, SOL_SOCKET, SO_REUSEADDR, (char FAR *)&optval,
		sizeof(optval)) == SOCKET_ERROR)
		/*如果设置失败*/
	{
		printf("setsockopt failed:%d", WSAGetLastError());
		closesocket(socketRec);
		WSACleanup();
		return;
	}
	/*绑定套接字和地址*/
	if (bind(socketRec, (struct sockaddr *)&addrRec,
		sizeof(struct sockaddr_in)) == SOCKET_ERROR)
		/*如果绑定失败*/
	{
		printf("bind failed with: %d\n", WSAGetLastError());
		closesocket(socketRec);
		WSACleanup();
		return;
	}
	/*从广播地址接收消息*/
	while (i<bCount)
	{
		recvfrom(socketRec, buf, 256, 0, (struct sockaddr FAR *)&addrBro, (int FAR *)&addrBroLen);
		/*延迟2秒钟*/
		Sleep(2000);
		/*输出接收到缓冲区的消息*/
		printf("%s\n", buf);
		printf("from address:%s\n", inet_ntoa(addrBro.sin_addr));
		/*情况缓冲区*/
		ZeroMemory(buf, 256);
		i++;
	}
	/*接收完毕后关闭套接字、释放占用资源*/
	closesocket(socketRec);
	WSACleanup();
}

/*多播控制函数*/
void mulControl()
{
	int optval;
	/*创建UDP套接字，用于多播*/
	if ((socketMul = WSASocket(AF_INET, SOCK_DGRAM, 0, NULL, 0,
		WSA_FLAG_MULTIPOINT_C_LEAF
		| WSA_FLAG_MULTIPOINT_D_LEAF
		| WSA_FLAG_OVERLAPPED)) == INVALID_SOCKET)
	{
		printf("socket failed with: %d\n", WSAGetLastError());
		WSACleanup();
		return;
	}

	/*设置本地接口地址*/
	addrLocal.sin_family = AF_INET;
	addrLocal.sin_port = htons(mPort);
	addrLocal.sin_addr.s_addr = dwInterface;

	/*设置该套接字为可重用类型*/
	optval = 1;
	if (setsockopt(socketMul, SOL_SOCKET, SO_REUSEADDR, (char FAR *)&optval,
		sizeof(optval)) == SOCKET_ERROR)
		/*如果设置失败*/
	{
		printf("setsockopt failed:%d", WSAGetLastError());
		closesocket(socketMul);
		WSACleanup();
		return;
	}
	/*将UDP套接字绑定到本地地址上*/
	if (bind(socketMul, (struct sockaddr *)&addrLocal,
		sizeof(addrLocal)) == SOCKET_ERROR)
		/*如果绑定失败*/
	{
		printf("bind failed with: %d\n", WSAGetLastError());
		closesocket(socketMul);
		WSACleanup();
		return;
	}

	/*设置多播地址各个选项*/
	addrMul.sin_family = AF_INET;
	addrMul.sin_port = htons(mPort);
	addrMul.sin_addr.s_addr = dwMulticastGroup;

	/*重新设置TTL值*/
	optval = 8;
	/*设置多播数据的TTL(存在时间)值。默认情况下，TTL值是1*/
	if (setsockopt(socketMul, IPPROTO_IP, IP_MULTICAST_TTL,
		(char *)&optval, sizeof(int)) == SOCKET_ERROR)
		/*如果设置失败*/
	{
		printf("setsockopt(IP_MULTICAST_TTL) failed: %d\n", WSAGetLastError());
		closesocket(socketMul);
		WSACleanup();
		return;
	}

	/*如果指定了返还选项*/
	if (bLoopBack)
	{
		/*设置返还选项为假，禁止将发送的数据返还给本地接口*/
		optval = 0;
		if (setsockopt(socketMul, IPPROTO_IP, IP_MULTICAST_LOOP,
			(char *)&optval, sizeof(optval)) == SOCKET_ERROR)
			/*如果设置失败*/
		{
			printf("setsockopt(IP_MULTICAST_LOOP) failed: %d\n",
				WSAGetLastError());
			closesocket(socketMul);
			WSACleanup();
			return;
		}
	}

	/*加入多播组*/
	if ((sockJoin = WSAJoinLeaf(socketMul, (SOCKADDR *)&addrMul,
		sizeof(addrMul), NULL, NULL, NULL, NULL,
		JL_BOTH)) == INVALID_SOCKET)
		/*如果加入不成功*/
	{
		printf("WSAJoinLeaf() failed: %d\n", WSAGetLastError());
		closesocket(socketMul);
		WSACleanup();
		return;
	}
}

void multicastSend()
{

	CHAR  sendbuf[BUFSIZE];
	DWORD i;
	int ret;

	mulControl();
	/*发送mCount条消息*/
	//addrMul.sin_port= htons(10001);在这里输入接收进程的端口
	addrMul.sin_port = htons(mPort);
	for (i = 0; i < mCount; i++)
	{
		/*将待发送的消息写入发送缓冲区*/
		sprintf(sendbuf, "server 1: This is a test: %d", i);
		ret = sendto(socketMul, (char *)sendbuf, strlen(sendbuf), 0,
			(struct sockaddr *)&addrMul, sizeof(addrMul));
		/*如果发送失败*/
		if (ret == SOCKET_ERROR)
		{
			printf("sendto failed with: %d\n", WSAGetLastError());
			closesocket(sockJoin);
			closesocket(socketMul);
			WSACleanup();
			return;
		}
		/*如果发送成功*/
		else
			printf("Send message %d\n", i);
		Sleep(500);
	}
	/*关闭套接字、释放占用资源*/
	closesocket(socketMul);
	WSACleanup();
}

/*多播消息接收函数*/
void multicastRec()
{
	DWORD i;
	struct sockaddr_in  from;
	CHAR recvbuf[BUFSIZE];
	int ret;
	int len = sizeof(struct sockaddr_in);

	mulControl();
	/*接收mCount条消息*/
	for (i = 0; i < mCount; i++)
	{
		/*将接收的消息写入接收缓冲区*/
		if ((ret = recvfrom(socketMul, recvbuf, BUFSIZE, 0,
			(struct sockaddr *)&from, &len)) == SOCKET_ERROR)
			/*如果接收不成功*/
		{
			printf("recvfrom failed with: %d\n", WSAGetLastError());
			closesocket(sockJoin);
			closesocket(socketMul);
			WSACleanup();
			return;
		}
		/*接收成功，输出接收的消息*/
		recvbuf[ret] = 0;
		printf("RECV: '%s' from <%s>\n", recvbuf, inet_ntoa(from.sin_addr));
	}
	/*关闭套接字、释放占用资源*/
	closesocket(socketMul);
	WSACleanup();
}

/*主函数*/
int main(int argc, char **argv)
{
	WSADATA wsd;

	initial();
	GetArgments(argc, argv);

	/*初始化Winsock*/
	if (WSAStartup(MAKEWORD(2, 2), &wsd) != 0)
	{
		printf("WSAStartup() failed\n");
		return -1;
	}

	/*如果是执行广播程序*/
	if (broadFlag)
	{
		/*以发送者身份发送消息*/
		if (broadSendFlag)
		{
			broadcastSend();
			return 0;
		}
		/*以接收者身份接收消息*/
		else
		{
			broadcastRec();
			return 0;
		}
	}

	/*如果是执行多播程序*/
	if (multiFlag)
	{
		/*以发送者身份发送消息*/
		if (multiSendFlag)
		{
			multicastSend();
			//return 0;
		}
		/*以接收者身份接收消息*/
		else
		{
			multicastRec();
			return 0;
		}
	}
	return 0;
}