LinuxC编写TCP，HTTP中转SOCKET服务器（模拟）

使用LinuxC编写TCP，HTTP多线程中转SOCKET服务器（模拟）

数据传输构造：
1、物联网节点已经将数据传到网关。
2、网关将数据通过TCP协议传到SOCKET中转服务器。
3、SOCKET中转服务器将数据通过HTTP POST传到WEB服务器接口。

此文做的是上述2，3两部分内容。
暂时实现了windows客户端（模拟网关）将数据传至Linux虚拟机服务端，Linux虚拟机服务端将数据回传到windows用Spring boot快速搭建的一个web小接口，有待实际测验。

/*Server*/#include<stdio.h>#include<sys/types.h>#include<netinet/in.h>#include<sys/socket.h>#include<netdb.h>#include<unistd.h>#include<string.h>#include<arpa/inet.h>#include<sys/wait.h>#include<errno.h>#include<pthread.h>#define PORT 10086#define MAX_CONN_LIMIT 4#define MAXLINE 1024  int http_post(char *ip,int port,char *page,char *buffer){  //data为要发送的数据    int sockfd,n;      char recvline[MAXLINE];      struct sockaddr_in servaddr;      char content[4096];      char content_line[50];     sprintf(content_line,"POST /%s HTTP/1.1\r\n",page);      char content_host[50];      sprintf(content_host,"HOST: %s:%d\r\n",ip,port);      char content_type[] = "Content-Type: application/x-www-form-urlencoded\r\n";      char content_len[50];      char data[50];    sprintf(data,"data=%s",buffer);    sprintf(content_len,"Content-Length: %d\r\n\r\n",strlen(data));      //用sprintf函数拼接出请求行和请求头content    sprintf(content,"%s%s%s%s%s",content_line,content_host,content_type,content_len,data);    if((sockfd = socket(AF_INET,SOCK_STREAM,0)) < 0)          printf("create socket(HTTP) error\n");      bzero(&servaddr,sizeof(servaddr));      servaddr.sin_family = AF_INET;      servaddr.sin_port = htons(8080);     //与8080端口建立连接    if(inet_pton(AF_INET,ip,&servaddr.sin_addr) <= 0)          printf("inet_pton error\n");      if(connect(sockfd,(struct sockaddr *)&servaddr,sizeof(servaddr)) < 0)          printf("create connect(HTTP) error\n");      write(sockfd,content,strlen(content));      while((n = read(sockfd,recvline,MAXLINE)) > 0)   //读取web服务器返回的值    {          recvline[n] = '\n';          if(fputs(recvline,stdout) == EOF)              printf("fputs error\n");      }      if(n < 0)          printf("read error\n");      close(sockfd);}  static void Data_Handle(void *conn_fd);int main(){ int socket_fd,connect_fd; struct sockaddr_in servaddr; char buffer[4096]; int n; socket_fd = socket(AF_INET,SOCK_STREAM,0);//初始化socket if(socket_fd == -1){    printf("create socket error:%s(errno:%d)\n",strerror(errno),errno);    return 0; } memset(&servaddr,0,sizeof(servaddr)); servaddr.sin_family = AF_INET; servaddr.sin_addr.s_addr = htonl(INADDR_ANY);//将IP地址设置为系统自动获取,否则直接写也行 servaddr.sin_port = htons(PORT); int on = 1; setsockopt( socket_fd, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on) );//设置地址复用 if(bind(socket_fd,(struct sockaddr*)&servaddr,sizeof(servaddr))==-1){    printf("bind socket error:%s(errno:%d)\n",strerror(errno),errno);    return 0; } if(listen(socket_fd,MAX_CONN_LIMIT) == -1){    printf("listen socket error:%s(errno:%d)\n",strerror(errno),errno);    return 0; } while(1){        printf("waiting for new connection...\n");    connect_fd = accept(socket_fd,(struct sockaddr*)NULL,NULL);    if(connect_fd == -1){            printf("accept socket error:%s(errno:%d)\n",strerror(errno),errno);             return 0;    }    //加入多线程    pthread_t thread_id;    if(pthread_create(&thread_id,NULL,(void *)(&Data_Handle),(void *)(&connect_fd)) == -1){       printf("create pthread error:%s(errno:%d)\n",strerror(errno),errno);        break;    }    printf("A new connection create!\n"); } shutdown(socket_fd,SHUT_WR); printf("Server shuts down\n"); return 0;}static void Data_Handle(void *conn_fd){  int fd = *((int *)conn_fd);  int recv_len;  char *recv_data[MAXLINE];  const char *msg_to_client = "Server has received your request!\n";  while(1){    printf("waiting for request...\n");    memset(recv_data,0,MAXLINE);    recv_len = read(fd,recv_data,MAXLINE);    if(recv_len == 0){      printf("Maybe the client has closed");      break;    }    if(recv_len == -1){nm       printf("read error:%s(errno:%d)\n",strerror(errno),errno);        break;    }    if(strcmp(recv_data,"quit")==0){      printf("Client Quit\n");      break;    }    printf("read from client : %s\n",recv_data);    printf("data:%s\n",recv_data);    http_post("192.168.110.1",8080,"helloWorld",recv_data);    if(write(fd,msg_to_client,strlen(msg_to_client)) == -1){      break;     }  }  printf("terminating current client_connection...\n");  close(fd);  pthread_exit(NULL);}

最终实现效果如下

参考：
http://www.cnblogs.com/nerohwang/p/3602233.html
http://blog.csdn.net/yc0188/article/details/4741871