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c - 通过 TCP/IP 套接字发送文件(网络服务器)

转载 作者：太空宇宙 更新时间：2023-11-04 05:25:08 26 4
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我正在编写 Web 服务器的准系统，但我无法弄清楚为什么我的文件没有通过我的套接字发送，我正在连接到它，但它不是 send() 正在处理我的文件...我错过了什么？

//代码 (server.c)

#include<netinet/in.h>    
#include<stdio.h>    
#include<stdlib.h>    
#include<sys/socket.h>    
#include<sys/stat.h>    
#include<sys/types.h>    
#include<unistd.h>    

int main(void) {    
   int create_socket, new_socket;    
   socklen_t addrlen;    
   int bufsize = 1024;    
   char *buffer = malloc(bufsize);    
   struct sockaddr_in address;    

   if ((create_socket = socket(AF_INET, SOCK_STREAM, 0)) > 0){    
      printf("The socket was created\n");
   }

   address.sin_family = AF_INET;    
   address.sin_addr.s_addr = INADDR_ANY;    
   address.sin_port = htons(80);    

   if (bind(create_socket, (struct sockaddr *) &address, sizeof(address)) == 0){    
      printf("Binding Socket\n");
   }

    long fsize;
    FILE *fp = fopen("index.html", "r");
    fseek(fp, 0, SEEK_END);
    fsize = ftell(fp);
    rewind(fp);
    char *msg = malloc(fsize + 1);
    fread(msg, sizeof(msg), 1, fp);

   while (1) {    
      if (listen(create_socket, 10) < 0) {    
         perror("server: listen");    
         exit(1);    
      }    

      if ((new_socket = accept(create_socket, (struct sockaddr *) &address, &addrlen)) < 0) {    
         perror("server: accept");    
         exit(1);    
      }    

      if (new_socket > 0){    
         printf("The Client is connected...\n");
      }

        recv(new_socket, buffer, bufsize, 0);    
        printf("%s\n", buffer);    
        write(new_socket, "HTTP/1.1 200 OK\n", 16);
        write(new_socket, "Content-length: 46\n", 19);
        write(new_socket, "Content-Type: text/html\n\n", 25);
/*      write(new_socket, "<html><body><H1>Hello world</H1></body></html>",46); */
        if((send(new_socket, msg, fsize+1, 0)) > 0){
            printf("success");
        }     
        else{
            printf("failed");
        }
      close(new_socket);    
   }    
   close(create_socket);    
   return 0;    
}

//FILE (index.html) *同目录

<html>
<body>
    <h1>Hello World</h1>
</body>
</html>

最佳答案

由于十几个不同的原因，代码完全被破坏了。尝试更像这样的东西:

#include <netinet/in.h>    
#include <stdio.h>    
#include <stdlib.h>    
#include <sys/socket.h>    
#include <sys/stat.h>    
#include <sys/types.h>    
#include <unistd.h>    

bool writeDataToClient(int sckt, const void *data, int datalen)
{
    const char *pdata = (const char*) data;

    while (datalen > 0){
        int numSent = send(sckt, pdata, datalen, 0);
        if (numSent <= 0){
            if (numSent == 0){
                printf("The client was not written to: disconnected\n");
            } else {
                perror("The client was not written to");
            }
            return false;
        }
        pdata += numSent;
        datalen -= numSent;
    }

    return true;
}

bool writeStrToClient(int sckt, const char *str)
{
    return writeDataToClient(sckt, str, strlen(str));
}

int main(void){
    int create_socket, new_socket;    
    char *buffer;
    int bufsize = 1024;    
    struct sockaddr_in address;    
    socklen_t addrlen;    

    buffer = (char*) malloc(bufsize);    
    if (!buffer){
        printf("The receive buffer was not allocated\n");
        exit(1);    
    }

    create_socket = socket(AF_INET, SOCK_STREAM, 0);
    if (create_socket == -1){    
        perror("The socket was not created");    
        exit(1);    
    }

    printf("The socket was created\n");

    memset(&address, 0, sizeof(address));    
    address.sin_family = AF_INET;    
    address.sin_addr.s_addr = INADDR_ANY;    
    address.sin_port = htons(80);    

    if (bind(create_socket, (struct sockaddr *) &address, sizeof(address)) == -1){    
        perror("The socket was not bound");    
        exit(1);    
    }

    printf("The socket is bound\n");    

    long fsize;
    FILE *fp = fopen("index.html", "rb");
    if (!fp){
        perror("The file was not opened");    
        exit(1);    
    }

    printf("The file was opened\n");

    if (fseek(fp, 0, SEEK_END) == -1){
        perror("The file was not seeked");
        exit(1);
    }

    fsize = ftell(fp);
    if (fsize == -1) {
        perror("The file size was not retrieved");
        exit(1);
    }
    rewind(fp);

    char *msg = (char*) malloc(fsize);
    if (!msg){
        perror("The file buffer was not allocated\n");
        exit(1);
    }

    if (fread(msg, fsize, 1, fp) != 1){
        perror("The file was not read\n");
        exit(1);
    }
    fclose(fp);

    printf("The file size is %ld\n", fsize);

    if (listen(create_socket, 10) == -1){
        perror("The socket was not opened for listening");    
        exit(1);    
    }    

    printf("The socket is listening\n");

    while (1) {    

        addrlen = sizeof(address);
        new_socket = accept(create_socket, (struct sockaddr *) &address, &addrlen);

        if (new_socket == -1) {    
            perror("A client was not accepted");    
            exit(1);    
        }    

        printf("A client is connected from %s:%hu...\n", inet_ntoa(address.sin_addr), ntohs(address.sin_port));    

        // I will leave it as an exercise for you to implement
        // a proper HTTP request parser here...
        int numRead = recv(new_socket, buffer, bufsize, 0);
        if (numRead < 1){
            if (numRead == 0){
                printf("The client was not read from: disconnected\n");
            } else {
                perror("The client was not read from");
            }
            close(new_socket);
            continue;
        }
        printf("%.*s\n", numRead, buffer);    

        if (!writeStrToClient(new_socket, "HTTP/1.1 200 OK\r\n")){
            close(new_socket);
            continue;
        }

        char clen[40];
        sprintf(clen, "Content-length: %ld\r\n", fsize);
        if (!writeStrToClient(new_socket, clen)){
            close(new_socket);
            continue;
        }

        if (!writeStrToClient(new_socket, "Content-Type: text/html\r\n")){
            close(new_socket);
            continue;
        }

        if (!writeStrToClient(new_socket, "Connection: close\r\n\r\n") == -1){
            close(new_socket);
            continue;
        }

        //if (!writeStrToClient(new_socket, "<html><body><H1>Hello world</H1></body></html>")){
        if (!writeDataToClient(new_socket, msg, fsize)){
            close(new_socket);
            continue;
        }

        printf("The file was sent successfully\n");
        close(new_socket);    
   }    

   close(create_socket);    
   return 0;    
}

关于c - 通过 TCP/IP 套接字发送文件(网络服务器)，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/32749925/

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