Socket communication programming for Linux system UDP 2

Example of UDP socket programming:

The server-side code is as follows:

?

1234567891011121314151617181920212223242526272829303132333435363738394041424344454647484950515253545556575859606162636465 66676869

/*************************************************************************  > File Name: server.c  > Author: SongLee  ************************************************************************/#include<sys/types.h> #include<sys/socket.h> #include<unistd.h> #include<netinet/in.h> #include<arpa/inet.h> #include<stdio.h> #include<stdlib.h> #include<errno.h> #include<netdb.h> #include<stdarg.h> #include<string.h>  #define SERVER_PORT 8000 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512  int main() {  /* 创建UDP套接口 */ struct sockaddr_in server_addr;  bzero(&server_addr, sizeof(server_addr));  server_addr.sin_family = AF_INET;  server_addr.sin_addr.s_addr = htonl(INADDR_ANY);  server_addr.sin_port = htons(SERVER_PORT);   /* 创建socket */ int server_socket_fd = socket(AF_INET, SOCK_DGRAM, 0);  if(server_socket_fd == -1)  {   perror("Create Socket Failed:");   exit(1);  }   /* 绑定套接口 */ if(-1 == (bind(server_socket_fd,(struct sockaddr*)&server_addr,sizeof(server_addr))))  {   perror("Server Bind Failed:");   exit(1);  }   /* 数据传输 */ while(1)  {    /* 定义一个地址，用于捕获客户端地址 */  struct sockaddr_in client_addr;   socklen_t client_addr_length = sizeof(client_addr);    /* 接收数据 */  char buffer[BUFFER_SIZE];   bzero(buffer, BUFFER_SIZE);   if(recvfrom(server_socket_fd, buffer, BUFFER_SIZE,0,(struct sockaddr*)&client_addr, &client_addr_length) == -1)   {    perror("Receive Data Failed:");    exit(1);   }    /* 从buffer中拷贝出file_name */  char file_name[FILE_NAME_MAX_SIZE+1];   bzero(file_name,FILE_NAME_MAX_SIZE+1);   strncpy(file_name, buffer, strlen(buffer)>FILE_NAME_MAX_SIZE?FILE_NAME_MAX_SIZE:strlen(buffer));   printf("%s\n", file_name);  }  close(server_socket_fd);  return 0; }

The client-side code is as follows:

?

123456789101112131415161718192021222324252627282930313233343536373839404142434445464748495051525354555657

/*************************************************************************  > File Name: client.c  > Author: SongLee  ************************************************************************/#include<sys/types.h> #include<sys/socket.h> #include<unistd.h> #include<netinet/in.h> #include<arpa/inet.h> #include<stdio.h> #include<stdlib.h> #include<errno.h> #include<netdb.h> #include<stdarg.h> #include<string.h>  #define SERVER_PORT 8000 #define BUFFER_SIZE 1024 #define FILE_NAME_MAX_SIZE 512  int main() {  /* 服务端地址 */ struct sockaddr_in server_addr;  bzero(&server_addr, sizeof(server_addr));  server_addr.sin_family = AF_INET;  server_addr.sin_addr.s_addr = inet_addr("127.0.0.1");  server_addr.sin_port = htons(SERVER_PORT);   /* 创建socket */ int client_socket_fd = socket(AF_INET, SOCK_DGRAM, 0);  if(client_socket_fd < 0)  {   perror("Create Socket Failed:");   exit(1);  }   /* 输入文件名到缓冲区 */ char file_name[FILE_NAME_MAX_SIZE+1];  bzero(file_name, FILE_NAME_MAX_SIZE+1);  printf("Please Input File Name On Server:\t");  scanf("%s", file_name);   char buffer[BUFFER_SIZE];  bzero(buffer, BUFFER_SIZE);  strncpy(buffer, file_name, strlen(file_name)>BUFFER_SIZE?BUFFER_SIZE:strlen(file_name));   /* 发送文件名 */ if(sendto(client_socket_fd, buffer, BUFFER_SIZE,0,(struct sockaddr*)&server_addr,sizeof(server_addr)) < 0)  {   perror("Send File Name Failed:");   exit(1);  }   close(client_socket_fd);  return 0; }

Socket communication programming for Linux system UDP 2