http网页文件下载服务器

  1. index.html

    1
    Hello from server, it works!

  2. server.c

    1
    2
    3
    4
    5
    6
    7
    8
    9
    10
    11
    12
    13
    14
    15
    16
    17
    18
    19
    20
    21
    22
    23
    24
    25
    26
    27
    28
    29
    30
    31
    32
    33
    34
    35
    36
    37
    38
    39
    #include <sys/socket.h>
    #include <string.h>
    #include <fcntl.h>
    #include <sys/sendfile.h>
    #include <unistd.h>
    #include <netinet/in.h>

    int  main()
    {
            int s = socket(AF_INET,SOCK_STREAM,0);

            struct sockaddr_in addr={
                    AF_INET,
                    0x901f,
                    0
            };

            bind(s, (struct sockaddr*)&addr, sizeof(addr));
                        
            listen(s, 10);

            int client_fd = accept(s, 0, 0);

            char buffer[256] = {0};
            recv(client_fd, buffer, 256, 0);

            //GET /file.html .....

            char *f = buffer + 5;
            *strchr(f, ' ') = 0;
            int opened_fd  = open(f, O_RDONLY);

            sendfile(client_fd, opened_fd, 0, 256);
            close(opened_fd);
            close(client_fd);
            close(s);

            return 0;
    }

  3. 编译运行

    1
    2
    gcc server.c
    strace ./a.out

  4. 运行后浏览器访问或者以下命令下载

    1
    wget localhost:8080/index.html

  5. 下载成功