From 8e005d0f13767db538e3d939188d73370db9042d Mon Sep 17 00:00:00 2001
From: Miguel <m.i@gmx.at>
Date: Thu, 27 Sep 2018 14:30:33 +0200
Subject: added linux tap support for fool's network stack

---
 net/main.c | 90 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 90 insertions(+)
 create mode 100644 net/main.c

(limited to 'net/main.c')

diff --git a/net/main.c b/net/main.c
new file mode 100644
index 0000000..339f037
--- /dev/null
+++ b/net/main.c
@@ -0,0 +1,90 @@
+//http://www.saminiir.com/lets-code-tcp-ip-stack-1-ethernet-arp/
+//https://openvpn.net/tuntap
+
+#ifdef PLATFORM_LINUX
+
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <sys/socket.h>
+#include <sys/ioctl.h>
+
+#include <fcntl.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <stdio.h>
+#include <stdint.h>
+#include <errno.h>
+#include <string.h>
+#include <linux/if_tun.h>
+#include <linux/if.h>
+
+#include "netdev.h"
+
+int fd;
+
+int tap_transmit(const void * p_data, uint16_t p_len)
+{
+    write(fd,p_data,p_len);
+    return 0;
+}
+
+int main(int argc, char **argv)
+{
+    int err;
+    char dev[]="tap0";
+    struct ifreq ifr;
+
+    if( (fd = open("/dev/net/tun", O_RDWR)) < 0 ) {
+        printf("Cannot open TUN/TAP dev\n");
+        exit(1);
+    }
+
+
+    memset(&ifr, 0, sizeof(ifr));
+    ifr.ifr_flags = IFF_TAP | IFF_NO_PI; 
+    strncpy(ifr.ifr_name, dev,IFNAMSIZ);
+
+    if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){
+        printf("ioctl failed for TAP\n");
+         close(fd);
+         return err;
+    }
+
+
+    struct netdev net_dev;
+
+
+    uint8_t mac[6];
+    mac[0]=0x7a;
+    mac[1]=0xa4;
+    mac[2]=0x7b;
+    mac[3]=0x72;
+    mac[4]=0x56;
+    mac[5]=0xa2;
+
+    memcpy(net_dev.hwaddr,mac,6);	                // use mac obtained from device
+    net_dev.ip=(192<<0)+(168<<8)+(0<<16)+(20<<24); // 192.168.0.20 // TODO: not hardcode!
+    net_dev.transmit=tap_transmit;
+
+    uint8_t buf[1024];
+
+    while(1)
+    {
+        uint32_t len=read(fd,buf,1024);
+
+        if(len==-1)
+        {
+            printf("read error: %s \n",strerror(errno));
+        }
+
+        printf("read %i bytes\n",len);
+        net_incoming(&net_dev,buf);
+    }
+
+    return 0;
+}
+
+
+#endif
+
+
-- 
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