Add small test program for TUN/TAP devices

diff --git a/.gitignore b/.gitignore
index da7834a..4d67b0c 100644 (file)
--- a/.gitignore
+++ b/.gitignore
@@ -39,6 +39,7 @@ scripts/udhcpc-script
 scripts/dhclient-script
 client/cm
 tools/wifi-scan
+tools/tap-test
 doc/*.bak
 doc/*.stamp
 doc/connman.*

diff --git a/tools/Makefile.am b/tools/Makefile.am
index af219ac..407811c 100644 (file)
--- a/tools/Makefile.am
+++ b/tools/Makefile.am
@@ -1,6 +1,6 @@
 
 if TOOLS
-noinst_PROGRAMS = wifi-scan
+noinst_PROGRAMS = wifi-scan tap-test
 
 wifi_scan_LDADD = @GLIB_LIBS@ @NETLINK_LIBS@
 endif

diff --git a/tools/tap-test.c b/tools/tap-test.c
new file mode 100644 (file)
index 0000000..357d41e
--- /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;
+}