linux-udp-客户端服务器结合体

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////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////// ////////////////////////////////////////////////////////////////////////// <br>#g++ -o server.bin UdpSever.cpp  -pthread<br> #include <stdio.h> #include <stdlib.h> #include <unistd.h> #include <netinet/in.h>//for sockaddr_in #include <arpa/inet.h>//for socket #include <string.h> #include <errno.h> #include <pthread.h> #include <string>   #if 0 #include "UdpProxy.h"   #else class UdpProxy { public:       UdpProxy();       virtual ~UdpProxy();       bool init(std::string strServerip, int nServerPost, int nLocalPort);       void SendUdpMessagte(std::string strMessage);       static void* thread_run(void*);   protected:       void OnReceive(std::string strMessage);     bool DoIniteLocalSocket(int nLocalPort);     bool DoIniteToSocket(std::string strServerip, int nServerPost);     void destory_local();     void destory_to();   private:     pthread_mutex_t m_mutex;     int m_local_socket_fd;     int m_to_socket_fd;     int mnLocalPort;     int mnToPort;     struct sockaddr_in m_local_addr;     struct sockaddr_in m_to_addr;     std::string mstrToIp;     pthread_t m_thread_run;   };   #endif   UdpProxy::UdpProxy() {     mnLocalPort = -1;     mnToPort = -1;     m_local_socket_fd = -1;     m_to_socket_fd = -1;     m_thread_run = -1;     mstrToIp = "";     pthread_mutex_init(&m_mutex, NULL); }   UdpProxy::~UdpProxy() {     destory_local();     destory_to();     pthread_mutex_destroy(&m_mutex); }   bool UdpProxy::init(std::string strServerip, int nServerPost, int nLocalPort) {     pthread_mutex_lock(&m_mutex);     bool bret = true;     printf("UdpProxy init %s %d %d \n",strServerip.c_str(),nServerPost,nLocalPort);     bret &= DoIniteLocalSocket(nLocalPort);     bret &= DoIniteToSocket(strServerip, nServerPost);     pthread_mutex_unlock(&m_mutex);     return bret; }   void UdpProxy::SendUdpMessagte(std::string strMessage) {     pthread_mutex_lock(&m_mutex);     if (m_to_socket_fd == -1)     {         printf("SendUdpMessagte error send socket is -1 \n");         if (mnToPort == -1 || mstrToIp == "")         {             printf("error!  SendUdpMessagte has not set serverip and port ! \n");             pthread_mutex_unlock(&m_mutex);             return;         }         if (DoIniteToSocket(mstrToIp, mnToPort) ==  false)         {             printf("SendUdpMessagte error re inite socket failed! \n");             pthread_mutex_unlock(&m_mutex);             return;         }     }     int len = sendto(m_to_socket_fd, strMessage.c_str(), strMessage.length(), 0, (struct sockaddr*)&m_to_addr, sizeof(m_to_addr));     if (len == -1)     {         printf("SendUdpMessagte error:%s\n", strerror(errno));     }     else     {         printf("SendUdpMessagte %d bytes have been sended successfully!\n", len);     }     pthread_mutex_unlock(&m_mutex); }   void UdpProxy::OnReceive(std::string strMessage) {     printf("OnReceive :%s \n",strMessage.c_str()); }   bool UdpProxy::DoIniteLocalSocket(int nLocalPort) {     if (nLocalPort != mnLocalPort)     {         printf("DoIniteLocalSocket \n");         if (mnLocalPort != -1)             destory_local();           mnLocalPort = nLocalPort;           if (pthread_create(&m_thread_run, NULL, thread_run, (void*)this) != 0)//创建子线程          {             perror("UdpProxy pthread_create thread_run failed!\n");         }     }     return true; } bool UdpProxy::DoIniteToSocket(std::string strServerip, int nServerPost) {     bool bInitToSocket = false;     if (m_to_socket_fd == -1)     {         bInitToSocket = true;     }     else if (nServerPost != mnToPort || mstrToIp != strServerip)     {         mstrToIp = strServerip;         bInitToSocket = true;         close(m_to_socket_fd);     }       mnToPort = nServerPost;       if (bInitToSocket)     {         m_to_socket_fd = -1;         printf("DoIniteToSocket:%s %d\n", strServerip.c_str(), mnToPort);         m_to_socket_fd = socket(AF_INET, SOCK_DGRAM, 0);         if (m_to_socket_fd == -1)         {             perror("DoIniteToSocket socket create error!\n");             return false;         }         m_to_addr.sin_family = AF_INET;         m_to_addr.sin_port = htons(nServerPost);         m_to_addr.sin_addr.s_addr = inet_addr(strServerip.c_str());     }     return true; }   void UdpProxy::destory_to() {     if (m_to_socket_fd != -1)     {         close(m_to_socket_fd);         m_to_socket_fd = -1;     }     mnToPort = -1; }   void UdpProxy::destory_local() {     if (m_local_socket_fd != -1)     {         close(m_local_socket_fd);         m_local_socket_fd = -1;     }       if (m_thread_run != -1)     {         pthread_join(m_thread_run, NULL);     }     mnLocalPort = -1; }     void* UdpProxy::thread_run(void* arg) {     UdpProxy* pUdpProxyObj = (UdpProxy*)arg;     int fd = socket(AF_INET, SOCK_DGRAM, 0);     pUdpProxyObj->m_local_socket_fd = fd;     if (fd == -1)     {         perror("socket create error!\n");         exit(-1);     }     pUdpProxyObj->m_local_addr.sin_family = AF_INET;     pUdpProxyObj->m_local_addr.sin_port = htons(pUdpProxyObj->mnLocalPort);     pUdpProxyObj->m_local_addr.sin_addr.s_addr = inet_addr("0.0.0.0");     int r;     r = bind(fd, (struct sockaddr*)&pUdpProxyObj->m_local_addr, sizeof(m_local_addr));     if (r == -1)     {         printf("Bind error!\n");         close(fd);         exit(-1);     }       char buf[10 * 1024];     struct sockaddr_in from;     socklen_t len;     len = sizeof(from);     while (true)     {         r = recvfrom(fd, buf, sizeof(buf), 0, (struct sockaddr*)&from, &len);         if (r > 0)         {             buf[r] = 0;             pUdpProxyObj->OnReceive(buf);         }         else         {             printf("thread_run recv error:%s\n", strerror(errno));             break;         }     }     close(fd); }     int main(int argc, char* argv[]) {     UdpProxy obj;     obj.init(argv[1], 6666, 6666);     while (true)     {         obj.SendUdpMessagte("hello ...");         sleep(3);     }     return 0; }