windows C++ 通過(guò)UDP廣播獲取網(wǎng)絡(luò)中所有設(shè)備ip地址

2019-11-08 03:21:15

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供稿：網(wǎng)友

說(shuō)明：

源碼下載地址：http://download.csdn.net/detail/dxzysk/9756896

源碼使用說(shuō)明，先在需要獲取ip地址的主機(jī)上運(yùn)行server端程序，然后在需要搜索主機(jī)的Pc上運(yùn)行client端程序

本文是windows版，VC++，在VS2010環(huán)境下調(diào)試成功。有時(shí)候需要搜索網(wǎng)絡(luò)中的設(shè)備，機(jī)器，服務(wù)器等，這就要要用到UDP廣播的方式，發(fā)送廣播命令，廣播給網(wǎng)絡(luò)中的每一個(gè)主機(jī)，該主機(jī)搜到廣播命令后，立刻發(fā)送給請(qǐng)求端自己的設(shè)備信息，這里以IP信息為例子。

思路

在每一個(gè)設(shè)備中部署sever端程序進(jìn)行監(jiān)控，client端發(fā)送廣播命令，每一個(gè)server收到命令后，返回給client自己的ip地址信息，給出代碼如下，其中，有部分，比如獲取ip地址參考來(lái)自網(wǎng)絡(luò)，尊重原創(chuàng)，樂(lè)于分享。

server端(windows控制臺(tái)程序)

server端監(jiān)聽(tīng)廣播命令”GetIPAddr”，收到命令后就相應(yīng)

#include <WinSock2.h> #include <stdio.h> #include <iostream> using namespace std; #PRagma comment(lib, "ws2_32.lib") #define GET_HOST_COMMAND "GetIPAddr"const int MAX_BUF_LEN = 255;#define SERVER_PORT 12811 //只返回一個(gè)ip地址bool GetLocalIP(char* ip) { //1.初始化wsa WSADATA wsaData; int ret=WSAStartup(MAKEWord(2,2),&wsaData); if (ret!=0) { return false; } //2.獲取主機(jī)名 char hostname[256]; ret=gethostname(hostname,sizeof(hostname)); if (ret==SOCKET_ERROR) { return false; } //3.獲取主機(jī)ip HOSTENT* host=gethostbyname(hostname); if (host==NULL) { return false; } //4.轉(zhuǎn)化為char*并拷貝返回 strcpy(ip,inet_ntoa(*(in_addr*)*host->h_addr_list)); return true; } bool doServer(){ int m_nPort = SERVER_PORT; SOCKET sClient; sockaddr_in clientAddr,bindAddr; WSADATA wsdata; //啟動(dòng)SOCKET庫(kù)，版本為2.0 WORD wVer=MAKEWORD(2,0); if( 0 != WSAStartup(wVer,&wsdata) ) { //AfxMessageBox(L"Not Support Socket2.0"); return false; } //用UDP初始化套接字 sClient=socket(AF_INET,SOCK_DGRAM,0); //設(shè)置該套接字為廣播類(lèi)型， BOOL optval=TRUE; bindAddr.sin_family=AF_INET; bindAddr.sin_addr.s_addr=htonl(INADDR_ANY); bindAddr.sin_port=htons(m_nPort); setsockopt(sClient,SOL_SOCKET,SO_BROADCAST,(char FAR *)&optval,sizeof(optval)); bind(sClient,(sockaddr *)&bindAddr,sizeof(sockaddr_in)); int nAddrLen = sizeof(SOCKADDR); char buf[256] = {0}; int fromlength=sizeof(SOCKADDR); printf("the server is start./n"); char ipaddr[30] = {0}; char buff[MAX_BUF_LEN] = ""; if (GetLocalIP(ipaddr)) { sprintf(buff, "my ip is:%s", ipaddr); } else { sprintf(buff, "%s", "my ip is:******"); } //有多個(gè)ip地址的時(shí)候，這樣調(diào)用 //IPInfo ips[10]; //int len1 = 0; //GetLocalIPs(ips, 10,&len1); while(true) { int nRet = recvfrom(sClient,buf,256,0,(struct sockaddr FAR *)&clientAddr,(int FAR *)&fromlength); if( SOCKET_ERROR != nRet ) { char *pIPAddr = inet_ntoa(clientAddr.sin_addr); if( NULL != pIPAddr ) { WCHAR wzIPBuffer[32] = {0}; printf("clientAddr: %s/n", pIPAddr); printf("receive command: %s/n", buf); } if (strcmp(buf,GET_HOST_COMMAND) != 0) { printf("the command not valid and was ignored./n", buf); continue; } // 發(fā)送數(shù)據(jù) int nSendSize = sendto(sClient, buff, strlen(buff), 0, (SOCKADDR*)&clientAddr, nAddrLen); if(SOCKET_ERROR == nSendSize) { int err = WSAGetLastError(); printf("/"sendto/" error!, error code is %d/n", err); return false; } } else { //AfxMessageBox(L"Recv UDP Failed"); } Sleep(1000); } closesocket(sClient); return true;}int main(){ if (!doServer()) { printf("sever returned an error"); return -1; } return 0;}

注意上面是只有一個(gè)Ip地址的情況，有的機(jī)器可能會(huì)有多個(gè)IP地址，不同的網(wǎng)絡(luò)，有線網(wǎng)，無(wú)線wifi等，需要獲取多個(gè)ip地址的方法：

//結(jié)構(gòu)體記錄ip信息typedef struct tagIPInfo { char ip[30]; }IPInfo; //獲取多個(gè)ip地址信息列表bool GetLocalIPs(IPInfo* ips,int maxCnt,int* cnt) { //1.初始化wsa WSADATA wsaData; int ret=WSAStartup(MAKEWORD(2,2),&wsaData); if (ret!=0) { return false; } //2.獲取主機(jī)名 char hostname[256]; ret=gethostname(hostname,sizeof(hostname)); if (ret==SOCKET_ERROR) { return false; } //3.獲取主機(jī)ip HOSTENT* host=gethostbyname(hostname); if (host==NULL) { return false; } //4.逐個(gè)轉(zhuǎn)化為char*并拷貝返回 *cnt=host->h_length<maxCnt?host->h_length:maxCnt; for (int i=0;i<*cnt;i++) { in_addr* addr=(in_addr*)*host->h_addr_list; strcpy(ips[i].ip,inet_ntoa(addr[i])); } return true; }

client端（windows控制臺(tái)程序）

client端發(fā)送”GetIPAddr”命令，并及時(shí)接收client端發(fā)過(guò)來(lái)的信息

//#include "stdafx.h" #include <WinSock2.h> #include <stdio.h> #pragma comment(lib, "ws2_32.lib") const int MAX_BUF_LEN = 255; #define GET_HOST_COMMAND "GetIPAddr"#define CLIENT_PORT 11121#define SERVER_PORT 12811int main() { int nPort = SERVER_PORT; WORD wVersionRequested; WSADATA wsaData; int err; // 啟動(dòng)socket api wVersionRequested = MAKEWORD( 2, 2 ); err = WSAStartup( wVersionRequested, &wsaData ); if ( err != 0 ) { return -1; } if ( LOBYTE( wsaData.wVersion ) != 2 || HIBYTE( wsaData.wVersion ) != 2 ) { WSACleanup( ); return -1; } // 創(chuàng)建socket SOCKET connect_socket; connect_socket = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if(INVALID_SOCKET == connect_socket) { err = WSAGetLastError(); printf("/"socket/" error! error code is %d/n", err); return -1; } // 用來(lái)綁定套接字 SOCKADDR_IN sin; sin.sin_family = AF_INET; sin.sin_port = htons(CLIENT_PORT); sin.sin_addr.s_addr = 0; // 用來(lái)從網(wǎng)絡(luò)上的廣播地址接收數(shù)據(jù) SOCKADDR_IN sin_from; sin_from.sin_family = AF_INET; sin_from.sin_port = htons(nPort); sin_from.sin_addr.s_addr = INADDR_BROADCAST; //設(shè)置該套接字為廣播類(lèi)型， bool bOpt = true; setsockopt(connect_socket, SOL_SOCKET, SO_BROADCAST, (char*)&bOpt, sizeof(bOpt)); // 綁定套接字 err = bind(connect_socket, (SOCKADDR*)&sin, sizeof(SOCKADDR)); if(SOCKET_ERROR == err) { err = WSAGetLastError(); printf("/"bind/" error! error code is %d/n", err); return -1; } printf("the client is start./n"); int nAddrLen = sizeof(SOCKADDR); char buff[MAX_BUF_LEN] = ""; int nLoop = 0; char szMsg[]=GET_HOST_COMMAND; int nLen=sizeof(sin_from); if( SOCKET_ERROR==sendto(connect_socket, szMsg, strlen(szMsg), 0, (sockaddr*)&sin_from, nLen) ) { // AfxMessageBox(L"Send UDP Failed"); return -1; } printf("send broadcast data:%s/n", GET_HOST_COMMAND); while(true) { // 接收數(shù)據(jù) int nSendSize = recvfrom(connect_socket, buff, MAX_BUF_LEN, 0, (SOCKADDR*)&sin_from, &nAddrLen); if(SOCKET_ERROR == nSendSize) { err = WSAGetLastError(); printf("/"recvfrom/" error! error code is %d/n", err); return -1; } buff[nSendSize] = '/0'; printf("received ip: %s/n", buff); } return 0; }