From 2973d0c78e9b8eed3c5af239927c6bd36af64604 Mon Sep 17 00:00:00 2001
From: "B. Watson" <yalhcru@gmail.com>
Date: Wed, 13 Mar 2019 02:50:42 -0400
Subject: initial commit

---
 uip/unix/tapdev.c | 152 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 152 insertions(+)
 create mode 100644 uip/unix/tapdev.c

(limited to 'uip/unix/tapdev.c')

diff --git a/uip/unix/tapdev.c b/uip/unix/tapdev.c
new file mode 100644
index 0000000..417b288
--- /dev/null
+++ b/uip/unix/tapdev.c
@@ -0,0 +1,152 @@
+/*
+ * Copyright (c) 2001, Swedish Institute of Computer Science.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ *
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ *
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ *
+ * 3. Neither the name of the Institute nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE INSTITUTE AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE INSTITUTE OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ * Author: Adam Dunkels <adam@sics.se>
+ *
+ * $Id: tapdev.c,v 1.8 2006/06/07 08:39:58 adam Exp $
+ */
+
+#define UIP_DRIPADDR0   192
+#define UIP_DRIPADDR1   168
+#define UIP_DRIPADDR2   0
+#define UIP_DRIPADDR3   1
+
+#include <fcntl.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/ioctl.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <sys/time.h>
+#include <sys/uio.h>
+#include <sys/socket.h>
+
+#ifdef linux
+#include <sys/ioctl.h>
+#include <linux/if.h>
+#include <linux/if_tun.h>
+#define DEVTAP "/dev/net/tun"
+#else  /* linux */
+#define DEVTAP "/dev/tap0"
+#endif /* linux */
+
+#include "uip.h"
+
+static int drop = 0;
+static int fd;
+
+
+/*---------------------------------------------------------------------------*/
+void
+tapdev_init(void)
+{
+  char buf[1024];
+  
+  fd = open(DEVTAP, O_RDWR);
+  if(fd == -1) {
+    perror("tapdev: tapdev_init: open");
+    exit(1);
+  }
+
+#ifdef linux
+  {
+    struct ifreq ifr;
+    memset(&ifr, 0, sizeof(ifr));
+    ifr.ifr_flags = IFF_TAP|IFF_NO_PI;
+    if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
+      perror(buf);
+      exit(1);
+    }
+  }
+#endif /* Linux */
+
+  snprintf(buf, sizeof(buf), "ifconfig tap0 inet %d.%d.%d.%d",
+	   UIP_DRIPADDR0, UIP_DRIPADDR1, UIP_DRIPADDR2, UIP_DRIPADDR3);
+  system(buf);
+
+}
+/*---------------------------------------------------------------------------*/
+unsigned int
+tapdev_read(void)
+{
+  fd_set fdset;
+  struct timeval tv, now;
+  int ret;
+  
+  tv.tv_sec = 0;
+  tv.tv_usec = 1000;
+
+
+  FD_ZERO(&fdset);
+  FD_SET(fd, &fdset);
+
+  ret = select(fd + 1, &fdset, NULL, NULL, &tv);
+  if(ret == 0) {
+    return 0;
+  }
+  ret = read(fd, uip_buf, UIP_BUFSIZE);
+  if(ret == -1) {
+    perror("tap_dev: tapdev_read: read");
+  }
+
+  /*  printf("--- tap_dev: tapdev_read: read %d bytes\n", ret);*/
+  /*  {
+    int i;
+    for(i = 0; i < 20; i++) {
+      printf("%x ", uip_buf[i]);
+    }
+    printf("\n");
+    }*/
+  /*  check_checksum(uip_buf, ret);*/
+  return ret;
+}
+/*---------------------------------------------------------------------------*/
+void
+tapdev_send(void)
+{
+  int ret;
+  /*  printf("tapdev_send: sending %d bytes\n", size);*/
+  /*  check_checksum(uip_buf, size);*/
+
+  /*  drop++;
+  if(drop % 8 == 7) {
+    printf("Dropped a packet!\n");
+    return;
+    }*/
+  ret = write(fd, uip_buf, uip_len);
+  if(ret == -1) {
+    perror("tap_dev: tapdev_send: writev");
+    exit(1);
+  }
+}
+/*---------------------------------------------------------------------------*/
-- 
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