有个朋友开了家网吧!说每次更新游戏什么的很麻烦,让我帮他编程实现局域网多播文件程序,由于我对网络不是很懂,特问各位大侠,需要些什么技术,有没有人做过,给点简单的源代码,或者提供一些网上资料!谢谢
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// Module: Mcastws1.c
//
// Purpose:
// This sample illustrates IP multicasting using the Winsock 1
// method of joining and leaving an multicast group. This sample
// may be invoked as either a sender or a receiver. In both cases,
// the specified multicast group is joined.
//
// Compile:
// cl -o Mcastws1 Mcastws1.c Wsock32.lib
//
// Command Line Options/Parameters
// mcastws1.exe [-s] [-m:str] [-p:int] [-i:str] [-l] [-n:int]
// -s Act as sender; otherwise receive data
// -m:str Dotted decimal IP multicast address to join
// -p:int Port number to use
// -i:str Local interface to use
// -l Disable the loopback
// -n:int Number of messages to send or receive
//
#include <windows.h>
#include <winsock.h>#include <stdio.h>
#include <stdlib.h>#define MCASTADDR "234.5.6.7"
#define MCASTPORT 25000
#define BUFSIZE 1024
#define DEFAULT_COUNT 500BOOL bSender = FALSE, // Act as sender?
bLoopBack = FALSE; // Disable loopback?DWORD dwInterface, // Local interface to bind to
dwMulticastGroup, // Multicast group to join
dwCount; // Number of messages to send/receiveshort iPort; // Port number to use//
// Function: usage
//
// Description:
// Print usage information and exit
//
void usage(char *progname)
{
printf("usage: %s -s -m:str -p:int -i:str -l -n:int\n",
progname);
printf(" -s Act as server (send data); otherwise\n");
printf(" receive data.\n");
printf(" -m:str Dotted decimal multicast IP addres 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);
}//
// Function: ValidateArgs
//
// Description:
// Parse the command line arguments and set some global flags,
// depending on the values
//
void ValidateArgs(int argc, char **argv)
{
int i; dwInterface = INADDR_ANY;
dwMulticastGroup = inet_addr(MCASTADDR);
iPort = MCASTPORT;
dwCount = DEFAULT_COUNT; for(i = 1; i < argc; i++)
{
if ((argv[i][0] == '-') || (argv[i][0] == '/'))
{
switch (tolower(argv[i][1]))
{
case 's': // Sender
bSender = TRUE;
break;
case 'm': // Multicast group to join
if (strlen(argv[i]) > 3)
dwMulticastGroup = inet_addr(&argv[i][3]);
break;
case 'i': // Local interface to use
if (strlen(argv[i]) > 3)
dwInterface = inet_addr(&argv[i][3]);
break;
case 'p': // Port number to use
if (strlen(argv[i]) > 3)
iPort = atoi(&argv[i][3]);
break;
case 'l': // Disable loopback?
bLoopBack = TRUE;
break;
case 'n': // Number of messages to send/recv
dwCount = atoi(&argv[i][3]);
break;
default:
usage(argv[0]);
break;
}
}
}
return;
}//
// Function: main
//
// Description:
// Parse the command line arguments, load the Winsock library,
// create a socket and join the multicast group. If this program
// is started as a sender then begin sending messages to the
// multicast group; otherwise, call recvfrom() to read messages
// sent to the group.
//
{
WSADATA wsd;
struct sockaddr_in local,
remote,
from;
struct ip_mreq mcast;
SOCKET sockM;
TCHAR recvbuf[BUFSIZE],
sendbuf[BUFSIZE];
int len = sizeof(struct sockaddr_in),
optval,
ret;
DWORD i=0; // Parse the command line and load Winsock
//
ValidateArgs(argc, argv);
if (WSAStartup(MAKEWORD(1, 1), &wsd) != 0)
{
printf("WSAStartup failed\n");
return -1;
}
// Create the socket. In Winsock 1 you don't need any special
// flags to indicate multicasting.
//
if ((sockM = socket(AF_INET, SOCK_DGRAM, 0)) == INVALID_SOCKET)
{
printf("socket failed with: %d\n", WSAGetLastError());
WSACleanup();
return -1;
}
// Bind the socket to the local interface. This is done so
// that we can receive data.
//
local.sin_family = AF_INET;
local.sin_port = htons(iPort);
local.sin_addr.s_addr = dwInterface; if (bind(sockM, (struct sockaddr *)&local,
sizeof(local)) == SOCKET_ERROR)
{
printf("bind failed with: %d\n", WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
} // Setup the im_req structure to indicate what group we want
// to join as well as the interface
//
remote.sin_family = AF_INET;
remote.sin_port = htons(iPort);
remote.sin_addr.s_addr = dwMulticastGroup; mcast.imr_multiaddr.s_addr = dwMulticastGroup;
mcast.imr_interface.s_addr = dwInterface; if (setsockopt(sockM, IPPROTO_IP, IP_ADD_MEMBERSHIP,
(char *)&mcast, sizeof(mcast)) == SOCKET_ERROR)
{
printf("setsockopt(IP_ADD_MEMBERSHIP) failed: %d\n",
WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
// Set the TTL to something else. The default TTL is 1.
//
optval = 8;
if (setsockopt(sockM, IPPROTO_IP, IP_MULTICAST_TTL,
(char *)&optval, sizeof(int)) == SOCKET_ERROR)
{
printf("setsockopt(IP_MULTICAST_TTL) failed: %d\n",
WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
// Disable the loopback if selected. Note that on NT4 and Win95
// you cannot disable it.
//
if (bLoopBack)
{
optval = 0;
if (setsockopt(sockM, IPPROTO_IP, IP_MULTICAST_LOOP,
(char *)&optval, sizeof(optval)) == SOCKET_ERROR)
{
printf("setsockopt(IP_MULTICAST_LOOP) failed: %d\n",
WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
} if (!bSender) // Receiver
{
// Receive some data
//
for(i = 0; i < dwCount; i++)
{
if ((ret = recvfrom(sockM, recvbuf, BUFSIZE, 0,
(struct sockaddr *)&from, &len)) == SOCKET_ERROR)
{
printf("recvfrom failed with: %d\n",
WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
recvbuf[ret] = 0;
printf("RECV: '%s' from <%s>\n", recvbuf,
inet_ntoa(from.sin_addr));
}
}
else // Sender
{
// Send some data
//
for(i = 0; i < dwCount; i++)
{
sprintf(sendbuf, "server 1: This is a test: %d", i);
if (sendto(sockM, (char *)sendbuf, strlen(sendbuf), 0,
(struct sockaddr *)&remote,
sizeof(remote)) == SOCKET_ERROR)
{
printf("sendto failed with: %d\n",
WSAGetLastError());
closesocket(sockM);
WSACleanup();
return -1;
}
Sleep(500);
}
}
// Drop group membership
//
if (setsockopt(sockM, IPPROTO_IP, IP_DROP_MEMBERSHIP,
(char *)&mcast, sizeof(mcast)) == SOCKET_ERROR)
{
printf("setsockopt(IP_DROP_MEMBERSHIP) failed: %d\n",
WSAGetLastError());
}
closesocket(sockM); WSACleanup();
return 0;
}