Differences

This shows you the differences between two versions of the page.

--- workshop:sockets [2010-09-29 19:50]
equinox
+++ workshop:sockets [2015-09-16 12:41]
@@ Line 1: / Line 1: @@
-====== Vortrag/Workshop Einführung in Einführung Unix Socket Programmierung ======
-  * by Christian Pointner
-==== Beispiel: udpclient ====
-<file>
-/*
- *  udpclient
- *
- *  This is a very basic UDP client example to show the usage of
- *  sockets.
- *
- *  Copyright (C) 2010 Christian Pointner <equinox@realraum.at>
- *
- *  udpclient is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  any later version.
- *
- *  udpclient is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with udpclient. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-int main(int argc, char** argv)
-{
-  if(argc <= 2) {
-    fprintf(stderr,"too few arguments\n");
-    exit(1);
-  }
-  printf("starting UDP Client\n");
-  int sock = socket(AF_INET, SOCK_DGRAM, 0);
-  if(sock < 0) {
-    perror("socket() call failed");
-    exit(-1);
-  }
-  struct sockaddr_in local_addr;
-  memset((char *) &local_addr, 0, sizeof(local_addr));
-  local_addr.sin_family = AF_INET;
-  local_addr.sin_port = htons(4321);
-  local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-  if(bind(sock, (struct sockaddr *)&local_addr, sizeof(local_addr))==-1) {
-    perror("bind() call failed");
-    exit(-1);
-  }
-  struct sockaddr_in remote_addr;
-  int alen, len;
-  alen = sizeof(remote_addr);
-  remote_addr.sin_family = AF_INET;
-  remote_addr.sin_port = htons(atoi(argv[2]));
-  if (inet_aton(argv[1], &remote_addr.sin_addr)==0) {
-    perror("inet_aton() call failed");
-    exit(-1);
-  }
-  uint8_t buffer[1500];
-  for (;;) {
-    if((len = read(0, buffer, 1500))==-1) {
-      perror("read() call failed");
-      exit(-1);
-    }
-    if((len = sendto(sock, buffer, len, 0, (struct sockaddr *)&remote_addr, alen))==-1) {
-      perror("sendto() call failed");
-      exit(-1);
-    }
-  }
-  close(sock);
-  printf("exiting UDP Client\n");
-  return 0;
-}
-</file>/*
- *  udpserver
- *
- *  This is a very basic UDP client example to show the usage of
- *  sockets.
- *
- *  Copyright (C) 2010 Christian Pointner <equinox@realraum.at>
- *
- *  udpserver is free software: you can redistribute it and/or modify
- *  it under the terms of the GNU General Public License as published by
- *  the Free Software Foundation, either version 3 of the License, or
- *  any later version.
- *
- *  udpserver is distributed in the hope that it will be useful,
- *  but WITHOUT ANY WARRANTY; without even the implied warranty of
- *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- *  GNU General Public License for more details.
- *
- *  You should have received a copy of the GNU General Public License
- *  along with udpserver. If not, see <http://www.gnu.org/licenses/>.
- */
-#include <stdio.h>
-#include <stdlib.h>
-#include <unistd.h>
-#include <errno.h>
-#include <string.h>
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <arpa/inet.h>
-int main(int argc, char** argv)
-{
-  printf("starting UDP Server\n");
-  int sock = socket(AF_INET, SOCK_DGRAM, 0);
-  if(sock < 0) {
-    perror("socket() call failed");
-    exit(-1);
-  }
-  struct sockaddr_in local_addr;
-  memset((char *) &local_addr, 0, sizeof(local_addr));
-  local_addr.sin_family = AF_INET;
-  local_addr.sin_port = htons(1234);
-  local_addr.sin_addr.s_addr = htonl(INADDR_ANY);
-  if(bind(sock, (struct sockaddr *)&local_addr, sizeof(local_addr))==-1) {
-    perror("bind() call failed");
-    exit(-1);
-  }
-  struct sockaddr_in remote_addr;
-  int alen, len;
-  alen = sizeof(remote_addr);
-  uint8_t buffer[1500];
-  for (;;) {
-    if((len = recvfrom(sock, buffer, 1500, 0, (struct sockaddr *)&remote_addr, &alen))==-1) {
-      perror("recvfrom() call failed");
-      exit(-1);
-    }
-    printf("Received %d Bytes from %s:%d\n", len, inet_ntoa(remote_addr.sin_addr), ntohs(remote_addr.sin_port));
-  }
-  close(sock);
-  printf("exiting UDP Server\n");
-  return 0;
-}
-</file>
-==== Beispiel: udpserver ====
-<file>
-----
-{{tag>workshop}}

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