Question

问题：

我将这两行添加到服务器后很快..

fff = popen(ccc, "r");
pclose(fff);

通过netcat测试时，我得到了“通过peer重置连接”。

echo test | nc <ip> <port>
   <response>
Ncat: Connection reset by peer.

没有那两行..

echo test | nc <ip> <port>
    <response>

平滑。没问题。

什么是正确的解决方案？

完整代码：

#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <netinet/in.h>
#include <netdb.h>
#include <arpa/inet.h>
#include <err.h>
#include <string.h>


FILE * fff;
char * ooo = "HTTP/1.1 200 OK\r\n\r\n aa \r\n";
char * ppp = "/10/web";
char iip [15];


int main()
{
  int one = 1, client_fd;
  struct sockaddr_in svr_addr, cli_addr;
  socklen_t sin_len = sizeof(cli_addr);

  int sock = socket(AF_INET, SOCK_STREAM, 0);
  if (sock < 0)
    err(1, "can't open socket");

  setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, &one, sizeof(int));

  int port = 50;
  svr_addr.sin_family = AF_INET;
  svr_addr.sin_addr.s_addr = INADDR_ANY;
  svr_addr.sin_port = htons(port);

  if (bind(sock, (struct sockaddr *) &svr_addr, sizeof(svr_addr)) == -1) {
    close(sock);
    err(1, "Can't bind");
  }

  listen(sock, 5);
  while (1) {
    client_fd = accept(sock, (struct sockaddr *) &cli_addr, &sin_len);
    snprintf(iip, 15, "%s", inet_ntoa(cli_addr.sin_addr));

    char * ccc;
    asprintf(&ccc, "%s %s", ppp, iip);
    fff = popen(ccc, "r");
    pclose(fff);

    printf(ccc);
    printf("\n");
    printf("connection.. \n");

    write(client_fd, ooo, strlen(ooo));
    close(client_fd);
  }
}

这很重要..这是文件（/ 10 / web）

#!/bin/sh
printf 'test';
echo 'uuuuuu';

Answer 1

“连接重置”表示服务器在未读取客户端发送的数据的情况下关闭了连接。鉴于您没有从client_fd读取，这是您应该期望的。要修复，请确保您已阅读客户端发送的内容。

Answer 2

popen会给出错误＆＃34;流目前在调用过程中打开＆＃34;。我建议你检查两行：

fff = popen(ccc, "r");
if (fp == NULL)

status=pclose(fff);
if (status == -1) 
/* Error reported by pclose() */
.
.

希望有所帮助

C-Server：Ncat：由对等方重置连接

2 个答案: