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Added tap device, packet receive and transmit functions.

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There still is a bug in the packet data handling, packat forwarding still is
defined only in one direction. Back-Direction will follow soon
This commit is contained in:
ole.reinhardt@googlemail.com 2014-10-27 11:50:12 +00:00
parent 82e76094c7
commit 1cc83677a3
1 changed files with 193 additions and 30 deletions
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223
example/libusb/panu_demo.c
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@ -11,10 +11,18 @@
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <linux/in.h>
#include <linux/if.h>
#include <linux/if_tun.h>
#include <net/if_arp.h>
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <errno.h>
#include "sdp_parser.h"
#include "sdp_client.h"
#include "sdp_query_util.h"
#include <btstack/hci_cmds.h>
#include <btstack/run_loop.h>
@ -24,12 +32,18 @@
#include "hci_dump.h"
#include "l2cap.h"
#include "sdp_parser.h"
#include "sdp_client.h"
#include "sdp_query_util.h"
#include "des_iterator.h"
#include "pan.h"
int record_id = -1;
int attribute_id = -1;
uint16_t public_browse_group = 0x1002;
uint16_t bnep_protocol_id = 0x000f;
static int record_id = -1;
static int attribute_id = -1;
static uint16_t public_browse_group = 0x1002;
static uint16_t bnep_protocol_id = 0x000f;
static uint16_t bnep_l2cap_psm = 0;
static uint16_t bnep_remote_uuid = 0;
static uint16_t bnep_version = 0;
static uint8_t attribute_value[1000];
static const int attribute_value_buffer_size = sizeof(attribute_value);
@ -37,7 +51,109 @@ static const int attribute_value_buffer_size = sizeof(attribute_value);
//static bd_addr_t remote = {0x04,0x0C,0xCE,0xE4,0x85,0xD3};
static bd_addr_t remote = {0xE0,0x06,0xE6,0xBB,0x95,0x79};
static int tap_fd = -1;
static char tap_dev_name[16] = "bnep%d";
static uint8_t network_buffer[BNEP_MTU_MIN];
static size_t network_buffer_len = 0;
static data_source_t tap_dev_ds;
/*************** TUN / TAP interface routines *********************
* *
* https://www.kernel.org/doc/Documentation/networking/tuntap.txt *
* *
******************************************************************/
int tap_alloc(char *dev, bd_addr_t bd_addr)
{
struct ifreq ifr;
int fd_dev;
int fd_socket;
int err;
if( (fd_dev = open("/dev/net/tun", O_RDWR)) < 0 ) {
fprintf(stderr, "TAP: Error opening /dev/net/tun: %s\n", strerror(errno));
return -1;
}
memset(&ifr, 0, sizeof(ifr));
/* Flags: IFF_TUN - TUN device (no Ethernet headers)
* IFF_TAP - TAP device
*
* IFF_NO_PI - Do not provide packet information
*/
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
if( *dev ) {
strncpy(ifr.ifr_name, dev, IFNAMSIZ);
}
if( (err = ioctl(fd_dev, TUNSETIFF, (void *) &ifr)) < 0 ) {
fprintf(stderr, "TAP: Error setting device name: %s\n", strerror(errno));
close(fd_dev);
return -1;
}
strcpy(dev, ifr.ifr_name);
fd_socket = socket(PF_INET, SOCK_DGRAM, IPPROTO_IP);
if (fd_socket < 0) {
close(fd_dev);
fprintf(stderr, "TAP: Error opening netlink socket: %s\n", strerror(errno));
return -1;
}
/* Configure the MAC address of the newly created bnep(x) device to the local bd_address */
memset (&ifr, 0, sizeof(struct ifreq));
strcpy(ifr.ifr_name, dev);
memcpy(ifr.ifr_hwaddr.sa_data, bd_addr, sizeof(bd_addr_t));
ifr.ifr_hwaddr.sa_family = ARPHRD_ETHER;
if (ioctl(fd_socket, SIOCSIFHWADDR, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error setting hw addr: %s\n", strerror(errno));
exit(1);
return -1;
}
/* Bring the interface up */
if (ioctl(fd_socket, SIOCGIFFLAGS, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error reading interface flags: %s\n", strerror(errno));
return -1;
}
if ((ifr.ifr_flags & IFF_UP) == 0) {
ifr.ifr_flags |= IFF_UP;
if (ioctl(fd_socket, SIOCSIFFLAGS, &ifr) == -1) {
close(fd_dev);
close(fd_socket);
fprintf(stderr, "TAP: Error set IFF_UP: %s\n", strerror(errno));
return -1;
}
}
close(fd_socket);
return fd_dev;
}
int process_tap_dev_data(struct data_source *ds)
{
ssize_t len;
len = read(ds->fd, network_buffer, sizeof(network_buffer));
if (len > 0) {
network_buffer_len = len;
} else {
fprintf(stderr, "TAP: Error while reading: %s\n", strerror(errno));
}
printf("Data from tap: %ld bytes\n", len);
return 0;
}
/*************** PANU client routines *********************/
char * get_string_from_data_element(uint8_t * element){
de_size_t de_size = de_get_size_type(element);
@ -65,6 +181,8 @@ static void handle_sdp_client_query_result(sdp_query_event_t *event)
{
sdp_query_attribute_value_event_t *value_event;
sdp_query_complete_event_t *complete_event;
des_iterator_t des_list_it;
des_iterator_t prot_it;
switch (event->type){
case SDP_QUERY_ATTRIBUTE_VALUE:
@ -81,16 +199,30 @@ static void handle_sdp_client_query_result(sdp_query_event_t *event)
if ((uint16_t)(value_event->data_offset+1) == value_event->attribute_length) {
switch(value_event->attribute_id){
switch(value_event->attribute_id) {
case SDP_ServiceClassIDList:
if (de_get_element_type(attribute_value) != DE_DES) break;
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
uint8_t * element = des_iterator_get_element(&des_list_it);
if (de_get_element_type(element) != DE_UUID) continue;
uint16_t uuid = de_element_get_uuid16(element);
switch (uuid){
case BNEP_UUID_PANU:
case BNEP_UUID_NAP:
case BNEP_UUID_GN:
printf("SDP Attribute 0x%04x: BNEP PAN protocol UUID: %04x\n", value_event->attribute_id, uuid);
bnep_remote_uuid = uuid;
break;
default:
break;
}
}
break;
case 0x0100:
case 0x0101:
printf("SDP Attribute: 0x%04x: %s\n", value_event->attribute_id, get_string_from_data_element(attribute_value));
break;
case 0x004: {
des_iterator_t des_list_it;
uint16_t l2cap_psm = 0;
uint16_t bnep_version = 0;
case 0x0004: {
printf("SDP Attribute: 0x%04x\n", value_event->attribute_id);
for (des_iterator_init(&des_list_it, attribute_value); des_iterator_has_more(&des_list_it); des_iterator_next(&des_list_it)) {
@ -112,7 +244,7 @@ static void handle_sdp_client_query_result(sdp_query_event_t *event)
case 0x0100:
if (!des_iterator_has_more(&prot_it)) continue;
des_iterator_next(&prot_it);
de_element_get_uint16(des_iterator_get_element(&prot_it), &l2cap_psm);
de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_l2cap_psm);
break;
case 0x000f:
if (!des_iterator_has_more(&prot_it)) continue;
@ -123,13 +255,14 @@ static void handle_sdp_client_query_result(sdp_query_event_t *event)
break;
}
}
printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", l2cap_psm, bnep_version);
printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version);
/*
printf(" -> row data (length %d): ", value_event->attribute_length);
hexdumpf(attribute_value, value_event->attribute_length);
printf("\n");
*/
/* Create BNEP connection */
bnep_connect(NULL, &remote, l2cap_psm, BNEP_UUID_GN);
bnep_connect(NULL, &remote, bnep_l2cap_psm, bnep_remote_uuid);
}
break;
default:
@ -151,21 +284,17 @@ static void handle_sdp_client_query_result(sdp_query_event_t *event)
static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
{
uint8_t event;
int rc;
uint8_t event;
bd_addr_t event_addr;
uint16_t uuid_source;
uint16_t uuid_dest;
uint16_t mtu;
if (packet_type != HCI_EVENT_PACKET) {
return;
}
event = packet[0];
switch (packet_type) {
case HCI_EVENT_PACKET:
switch (event) {
event = packet[0];
switch (event) {
case BTSTACK_EVENT_STATE:
/* BT Stack activated, get started */
if (packet[2] == HCI_STATE_WORKING) {
@ -201,8 +330,9 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
uuid_source = READ_BT_16(packet, 3);
uuid_dest = READ_BT_16(packet, 5);
mtu = READ_BT_16(packet, 7);
bt_flip_addr(event_addr, &packet[9]);
printf("BNEP connection from %s source UUID 0x%04x dest UUID: 0x%04x, max frame size: %u", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu);
//bt_flip_addr(event_addr, &packet[9]);
memcpy(&event_addr, &packet[9], sizeof(bd_addr_t));
printf("BNEP connection from %s source UUID 0x%04x dest UUID: 0x%04x, max frame size: %u\n", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu);
break;
case BNEP_EVENT_OPEN_CHANNEL_COMPLETE:
@ -213,19 +343,52 @@ static void packet_handler (void * connection, uint8_t packet_type, uint16_t cha
uuid_source = READ_BT_16(packet, 3);
uuid_dest = READ_BT_16(packet, 5);
mtu = READ_BT_16(packet, 7);
bt_flip_addr(event_addr, &packet[9]);
printf("BNEP connection open succeeded to %s source UUID 0x%04x dest UUID: 0x%04x, max frame size %u", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu);
//bt_flip_addr(event_addr, &packet[9]);
memcpy(&event_addr, &packet[9], sizeof(bd_addr_t));
printf("BNEP connection open succeeded to %s source UUID 0x%04x dest UUID: 0x%04x, max frame size %u\n", bd_addr_to_str(event_addr), uuid_source, uuid_dest, mtu);
/* Create the tap interface */
tap_fd = tap_alloc(tap_dev_name, *hci_local_bd_addr());
if (tap_fd < 0) {
printf("Creating BNEP tap device failed: %s\n", strerror(errno));
} else {
printf("BNEP device \"%s\"allocated.\n", tap_dev_name);
/* Create and register a new runloop data source */
tap_dev_ds.fd = tap_fd;
tap_dev_ds.process = process_tap_dev_data;
run_loop_add_data_source(&tap_dev_ds);
}
}
break;
case BNEP_EVENT_CHANNEL_CLOSED:
printf("BNEP channel closed\n");
run_loop_remove_data_source(&tap_dev_ds);
if (tap_fd > 0) {
close(tap_fd);
tap_fd = -1;
}
break;
default:
break;
}
break;
case BNEP_DATA_PACKET:
printf("BNEP: Received %d bytes\n", size);
/* Write out the ethernet frame to the tap device */
if (tap_fd > 0) {
printf_hexdump(packet, size);
rc = write(tap_fd, packet, size);
if (rc < 0) {
fprintf(stderr, "TAP: Could not write to TAP device: %s\n", strerror(errno));
} else
if (rc != size) {
fprintf(stderr, "TAP: Package written only partially %d of %d bytes\n", rc, size);
}
}
break;
default:
break;