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-rw-r--r--tools/tap-test.c197
1 files changed, 197 insertions, 0 deletions
diff --git a/tools/tap-test.c b/tools/tap-test.c
new file mode 100644
index 00000000..357d41e9
--- /dev/null
+++ b/tools/tap-test.c
@@ -0,0 +1,197 @@
+/*
+ *
+ * Connection Manager
+ *
+ * Copyright (C) 2007-2009 Intel Corporation. All rights reserved.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program 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 this program; if not, write to the Free Software
+ * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
+ *
+ */
+
+#ifdef HAVE_CONFIG_H
+#include <config.h>
+#endif
+
+#include <stdio.h>
+#include <errno.h>
+#include <fcntl.h>
+#include <unistd.h>
+#include <string.h>
+#include <sys/poll.h>
+#include <sys/ioctl.h>
+
+#include <netinet/in.h>
+#include <netinet/ip.h>
+#include <net/ethernet.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <linux/if_tun.h>
+
+static int inet_ifup(const char *ifname)
+{
+ struct ifreq ifr;
+ int sk, err;
+
+ sk = socket(PF_INET, SOCK_DGRAM, 0);
+ if (sk < 0)
+ return -errno;
+
+ memset(&ifr, 0, sizeof(ifr));
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+ if (ioctl(sk, SIOCGIFFLAGS, &ifr) < 0) {
+ err = -errno;
+ goto done;
+ }
+
+ if (ifr.ifr_flags & IFF_UP) {
+ err = -EALREADY;
+ goto done;
+ }
+
+ ifr.ifr_flags |= IFF_UP;
+
+ if (ioctl(sk, SIOCSIFFLAGS, &ifr) < 0) {
+ err = -errno;
+ goto done;
+ }
+
+ err = 0;
+
+done:
+ close(sk);
+
+ return err;
+}
+
+static int create_tap(const char *ifname)
+{
+ struct ifreq ifr;
+ int fd, val;
+
+ fd = open("/dev/net/tun", O_RDWR);
+ if (fd < 0) {
+ perror("Failed to open TUN/TAP device");
+ return -1;
+ }
+
+ memset(&ifr, 0, sizeof(ifr));
+ ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
+ strncpy(ifr.ifr_name, ifname, sizeof(ifr.ifr_name));
+
+ if (ioctl(fd, TUNSETIFF, (void *) &ifr) < 0) {
+ perror("Failed to set TUN/TAP interface");
+ close(fd);
+ return -1;
+ }
+
+ val = ARPHRD_ETHER;
+
+ if (ioctl(fd, TUNSETLINK, (unsigned long) val) < 0)
+ perror("Failed to set TUN/TAP link type");
+
+ return fd;
+}
+
+static void dump_packet(unsigned char *buf, int len)
+{
+ int i;
+
+ printf("[");
+ for (i = 0; i < len; i++) {
+ printf(" %02x", buf[i]);
+ if ((i + 1) % 16 == 0)
+ printf("\n ");
+ else if ((i + 1) % 8 == 0)
+ printf(" ");
+ }
+ printf(" ]\n");
+}
+
+static void decode_ip(unsigned char *buf, int len)
+{
+ struct iphdr *ip = (void *) buf;
+
+ printf(" IP proto %d saddr 0x%08x daddr 0x%08x\n",
+ ip->protocol, ip->saddr, ip->daddr);
+}
+
+static void decode_packet(unsigned char *buf, int len)
+{
+ struct ether_header *eh = (void *) buf;
+ char src[18], dst[18];
+ uint16_t type;
+
+ snprintf(dst, sizeof(dst), "%02x:%02x:%02x:%02x:%02x:%02x",
+ eh->ether_dhost[0], eh->ether_dhost[1],
+ eh->ether_dhost[2], eh->ether_dhost[3],
+ eh->ether_dhost[4], eh->ether_dhost[5]);
+
+ snprintf(src, sizeof(src), "%02x:%02x:%02x:%02x:%02x:%02x",
+ eh->ether_shost[0], eh->ether_shost[1],
+ eh->ether_shost[2], eh->ether_shost[3],
+ eh->ether_shost[4], eh->ether_shost[5]);
+
+ type = ntohs(eh->ether_type);
+
+ printf("> type 0x%04x src %s dst %s <\n", type, src, dst);
+
+ switch (type) {
+ case ETHERTYPE_IP:
+ decode_ip(buf + 14, len - 14);
+ break;
+ case ETHERTYPE_LOOPBACK:
+ dump_packet(buf, len);
+ break;
+ }
+}
+
+int main(int argc, char *argv[])
+{
+ const char *ifname = "xxx";
+ struct pollfd p;
+ int fd;
+
+ fd = create_tap(ifname);
+ if (fd < 0)
+ return 1;
+
+ if (inet_ifup(ifname) < 0) {
+ close(fd);
+ return 1;
+ }
+
+ memset(&p, 0, sizeof(p));
+ p.fd = fd;
+ p.events = POLLHUP | POLLIN;
+
+ while (1) {
+ unsigned char buf[2048];
+ int len;
+
+ len = poll(&p, 1, -1);
+ if (len < 0)
+ break;
+ if (len == 0)
+ continue;
+
+ len = read(fd, buf, sizeof(buf));
+ if (len < 0)
+ break;
+
+ decode_packet(buf, len);
+ }
+
+ return 0;
+}