siminetd.cpp

伯克利做的SFTP安全文件传输协议

// siminetd.cpp
// program to simulate the way inetd starts a network server
// copyright SafeTP Development Group, Inc., 2000  Terms of use are as specified in license.txt

#include "sockutil.h"      // listen_socket, etc.
#include <stdio.h>         // perror

#define FD_STDIN 0
#define FD_STDOUT 1

int main()
{
  // listen for a connection
  SOCKET listener = listen_socket(5555);

  // wait for incoming, and make a new socket for it when it arrives
  fprintf(stderr, "listening for incoming connection...\n");
  SOCKET conn = accept_socket(listener);
  fprintf(stderr, "received connection, echoing\n");

  // replace *my* stdin and stdout with the new connection
  if (dup2(conn, FD_STDIN) < 0 ||
      dup2(conn, FD_STDOUT) < 0) {
    perror("dup2");
    return 2;
  }

  // do what the echo server does
  int charCount = 0;
  for (;; charCount++) {
    // read a character
    char ch;
    int len = recv(FD_STDIN, &ch, 1, 0);
    if (len == 0) {
      // eof
      break;
    }
    if (len < 0) {
      perror("recv");
      return 2;
    }

    // write that character
    len = send(FD_STDOUT, &ch, 1, 0);
    if (len != 1) {
      perror("recv");
    }
  }

  // close both sockets
  if (close(FD_STDIN) < 0 ||
      close(FD_STDOUT) < 0) {
    perror("close");
    return 2;
  }

  fprintf(stderr, "done, echoed %d characters\n", charCount);
  return 0;
}