Knowledge Base Nr: 00020 socketserver.cpp - http://www.swe-kaiser.de

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linux: template consolenprogramm socketserver (non-blocking input mit curses)

  
//build: g++ main.cpp -o myname -lncurses


#include <iostream.h>
#include <stdlib.h>
#include <stdio.h>
#include <time.h>
#include <sys/time.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <sys/ioctl.h>
#include <unistd.h>
#include <termios.h>
#include <signal.h>
#include <string.h>

#include <curses.h>

#include <arpa/inet.h>
#include <netinet/in.h>
#include <sys/socket.h>


///////////globale definitionen//////////////////////////



//////////////////main/////////////////////////////////////////
//#define TRACE
#define TRACE printf

#define PORTNO 4711
#define MAXCLIENTS 32
#define MAXBUFFER 4096

int main(int argc, char *argv[])
{
  initscr();
  cbreak();
  fcntl(fileno(stdin), F_SETFL, fcntl(fileno(stdin), F_GETFL) | O_NONBLOCK);

  printf("*** %s\r\n*** usage: %s [a] [b] [c]\r\n", argv[0], argv[0]);
  TRACE("* args: %s", argv[0]);
  for (int n=1; n<argc; n++)
    TRACE(" [%s]", argv[n]);
  TRACE("\r\n");

  int sockfd = socket(PF_INET, SOCK_STREAM, 0);
  if (sockfd<0)
  {
    printf("ERROR: anlegen socket. errno: %d strerror: %s\r\n", errno, strerror);
    return 1;
  }

  //zulassen: socket sofort wiederbenutzbar
  int i = 1;
  setsockopt(sockfd, SOL_SOCKET, SO_REUSEADDR, &i, sizeof(i));

  struct sockaddr_in adresse;
  adresse.sin_family = AF_INET;
  adresse.sin_port = htons(PORTNO);
  memset(&adresse.sin_addr, 0, sizeof(adresse.sin_addr));

  int nRes = bind(sockfd, (struct sockaddr*)&adresse, sizeof(adresse));
  if (nRes != 0)
  {
    printf("ERROR: bind. errno: %d strerror: %s\r\n", errno, strerror);
    return 1;
  }

  nRes = listen(sockfd, MAXCLIENTS);
  if (nRes != 0)
  {
    printf("ERROR: listen. errno: %d strerror: %s\r\n", errno, strerror);
    return 1;
  }

  size_t adrlen = sizeof(struct sockaddr_in);
  TRACE("warten auf clients...\r\n"); fflush(stdout);

//////////
int connfd;

while ((connfd = accept(sockfd, (struct sockaddr*)&adresse, &adrlen)) >= 0)
{
  if (connfd<0)
  {
    printf("ERROR: accept. errno: %d strerror: %s\r\n", errno, strerror);
    return 1;
  }

  TRACE("client meldet sich an!\r\n"); fflush(stdout);

  char puffer[MAXBUFFER];
  int i=0;
  while (1)
  {
    nRes = read(connfd, &puffer[i], 1);
    if (nRes<0)
    {
      printf("ERROR: read. errno: %d strerror: %s\r\n", errno, strerror);
      return 1;
    }

    //echo
    nRes = write(connfd, &puffer[i], 1);
    if (nRes<0)
    {
      printf("ERROR: write. errno: %d strerror: %s\r\n", errno, strerror);
      return 1;
    }


    if (puffer[i] == '\n')
    {
      puffer[i] = 0;
      printf("client: %s\r\n", puffer); fflush(stdout);
      i = 0;
    }
    else
    {
      i++;
    }
  }

  close(connfd);
}
///////

  close(sockfd);

  return EXIT_SUCCESS;
}