c 언어는 socket 서버/클라이언트가 tcp를 통해 파일을 전송하는 것을 실현한다

서비스 포트가 시작되면 클라이언트는 IP 주소를 통해 서비스 포트에 연결한 다음에 보낼 파일 이름을 입력하여 서비스 포트에 파일을 보냅니다.

/*client.c*/
#include                         // for sockaddr_in  
#include                          // for socket  
#include                         // for socket  
#include                              // for printf  
#include                             // for exit  
#include                             // for bzero  

#define HELLO_WORLD_SERVER_PORT       6666  
#define BUFFER_SIZE                   1024  
#define FILE_NAME_MAX_SIZE            512  

int main(int argc, char **argv)  
{  
    if (argc != 2)  
    {  
        printf("Usage: ./%s ServerIPAddress
", argv[0]);  
        exit(1);  
    }  

    //     socket    client_addr,       internet       
    struct sockaddr_in client_addr;  
    bzero(&client_addr, sizeof(client_addr));  
    client_addr.sin_family = AF_INET; // internet     
    client_addr.sin_addr.s_addr = htons(INADDR_ANY); // INADDR_ANY            
    client_addr.sin_port = htons(0); // auto allocated,                

    //     internet    (TCP)  socket， client_socket     socket  
    int client_socket = socket(AF_INET, SOCK_STREAM, 0);  
    if (client_socket < 0)  
    {  
        printf("Create Socket Failed!
");  
        exit(1);  
    }  

    //      socket     socket         
    if (bind(client_socket, (struct sockaddr*)&client_addr, sizeof(client_addr)))  
    {  
        printf("Client Bind Port Failed!
");  
        exit(1);  
    }  

    //     socket    server_addr,      internet       
    struct sockaddr_in  server_addr;  
    bzero(&server_addr, sizeof(server_addr));  
    server_addr.sin_family = AF_INET;  

    //     IP            
    if (inet_aton(argv[1], &server_addr.sin_addr) == 0)  
    {  
        printf("Server IP Address Error!
");  
        exit(1);  
    }  

    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);  
    socklen_t server_addr_length = sizeof(server_addr);  

    //           ，     client_socket             socket    
    if (connect(client_socket, (struct sockaddr*)&server_addr, server_addr_length) < 0)  
    {  
        printf("Can Not Connect To %s!
", argv[1]);  
        exit(1);  
    }  

    char file_name[FILE_NAME_MAX_SIZE + 1];  
    bzero(file_name, sizeof(file_name));  
    printf("Please Input File Name On Server.\t");  
    scanf("%s", file_name);  

    char buffer[BUFFER_SIZE];  
    bzero(buffer, sizeof(buffer));  
    strncpy(buffer, file_name, strlen(file_name) > BUFFER_SIZE ? BUFFER_SIZE : strlen(file_name));  
    //       buffer    ，  buffer                    
    send(client_socket, buffer, BUFFER_SIZE, 0);  

    FILE *fp = fopen(file_name, "w");  
    if (fp == NULL)  
    {  
        printf("File:\t%s Can Not Open To Write!
", file_name);  
        exit(1);  
    }  

    //           buffer    
    bzero(buffer, sizeof(buffer));  
    int length = 0;  
    while(length = recv(client_socket, buffer, BUFFER_SIZE, 0))  
    {  
        if (length < 0)  
        {  
            printf("Recieve Data From Server %s Failed!
", argv[1]);  
            break;  
        }  

        int write_length = fwrite(buffer, sizeof(char), length, fp);  
        if (write_length < length)  
        {  
            printf("File:\t%s Write Failed!
", file_name);  
            break;  
        }  
        bzero(buffer, BUFFER_SIZE);  
    }  

    printf("Recieve File:\t %s From Server[%s] Finished!
", file_name, argv[1]);  

    //     ，  socket   
    fclose(fp);  
    close(client_socket);  
    return 0;  

}  

/*server.c*/
#include
#include
#include
#include
#include
#include

#define HELLO_WORLD_SERVER_PORT    6666         //   
#define LENGTH_OF_LISTEN_QUEUE     20
#define BUFFER_SIZE                1024
#define FILE_NAME_MAX_SIZE         512

int main(int argc, char **argv)
{
    // set socket's address information
    //     socket    server_addr,     internet      
    struct sockaddr_in   server_addr;
    bzero(&server_addr, sizeof(server_addr));
    server_addr.sin_family = AF_INET;
    server_addr.sin_addr.s_addr = htons(INADDR_ANY);
    server_addr.sin_port = htons(HELLO_WORLD_SERVER_PORT);

    // create a stream socket
    //     internet    (TCP)socket， server_socket                
    int server_socket = socket(PF_INET, SOCK_STREAM, 0);
    if (server_socket < 0)
    {
        printf("Create Socket Failed!
");
        exit(1);
    }

    //  socket socket      
    if (bind(server_socket, (struct sockaddr*)&server_addr, sizeof(server_addr)))
    {
        printf("Server Bind Port: %d Failed!
", HELLO_WORLD_SERVER_PORT);
        exit(1);
    }

    // server_socket    
    if (listen(server_socket, LENGTH_OF_LISTEN_QUEUE))
    {
        printf("Server Listen Failed!
");
        exit(1);
    }

    //                     
    while(1)
    {
        //       socket    client_addr，            ，  accept
        //      ，   client            client_addr 
        struct sockaddr_in client_addr;
        socklen_t          length = sizeof(client_addr);

        //      client   server      ,          client_addr 
        //         ，              ，  accept     ，  
        //  select()       
        // accpet      socket,  socket        server client    
        //    new_server_socket         
        int new_server_socket = accept(server_socket, (struct sockaddr*)&client_addr, &length);
        if (new_server_socket < 0)
        {
            printf("Server Accept Failed!
");
            break;
        }

        char buffer[BUFFER_SIZE];
        bzero(buffer, sizeof(buffer));
        length = recv(new_server_socket, buffer, BUFFER_SIZE, 0);
        if (length < 0)
        {
            printf("Server Recieve Data Failed!
");
            break;
        }

        char file_name[FILE_NAME_MAX_SIZE + 1];
        bzero(file_name, sizeof(file_name));
        strncpy(file_name, buffer,
                strlen(buffer) > FILE_NAME_MAX_SIZE ? FILE_NAME_MAX_SIZE : strlen(buffer));

        FILE *fp = fopen(file_name, "r");
        if (fp == NULL)
        {
            printf("File:\t%s Not Found!
", file_name);
        }
        else
        {
            bzero(buffer, BUFFER_SIZE);
            int file_block_length = 0;
            while( (file_block_length = fread(buffer, sizeof(char), BUFFER_SIZE, fp)) > 0)
            {
                printf("file_block_length = %d
", file_block_length);

                //   buffer      new_server_socket,           
                if (send(new_server_socket, buffer, file_block_length, 0) < 0)
                {
                    printf("Send File:\t%s Failed!
", file_name);
                    break;
                }

                bzero(buffer, sizeof(buffer));
            }
            fclose(fp);
            printf("File:\t%s Transfer Finished!
", file_name);
        }

        close(new_server_socket);
    }

    close(server_socket);

    return 0;
}

코드를 네트워크에 베끼다.