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btstack/example/embedded/panu_demo.c
mila@ringwald.ch 881797bd1b des_iterator moved to sdp_util
2014-12-12 08:42:35 +00:00

450 lines
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/* -*- Mode: C; indent-tabs-mode: nil; c-basic-offset: 4; tab-width: 4 -*- */
/*
* panu_demo.c
* Copyright (C) 2014 Ole Reinhardt <ole.reinhardt@kernelconcepts.de>
*
*/
#include "btstack-config.h"
#include <stdint.h>
#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 <btstack/hci_cmds.h>
#include <btstack/run_loop.h>
#include <btstack/sdp_util.h>
#include "hci.h"
#include "btstack_memory.h"
#include "hci_dump.h"
#include "l2cap.h"
#include "sdp_parser.h"
#include "sdp_client.h"
#include "sdp_query_util.h"
#include "pan.h"
static int record_id = -1;
static uint16_t bnep_protocol_id = 0x000f;
static uint16_t bnep_l2cap_psm = 0;
static uint32_t bnep_remote_uuid = 0;
static uint16_t bnep_version = 0;
static uint16_t bnep_cid = 0;
static uint8_t attribute_value[1000];
static const unsigned 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));
}
if (bnep_can_send_packet_now(bnep_cid)) {
bnep_send(bnep_cid, network_buffer, network_buffer_len);
network_buffer_len = 0;
} else {
/* park the current network packet */
run_loop_remove_data_source(&tap_dev_ds);
}
return 0;
}
/*************** PANU client routines *********************/
char * get_string_from_data_element(uint8_t * element){
de_size_t de_size = de_get_size_type(element);
int pos = de_get_header_size(element);
int len = 0;
switch (de_size){
case DE_SIZE_VAR_8:
len = element[1];
break;
case DE_SIZE_VAR_16:
len = READ_NET_16(element, 1);
break;
default:
break;
}
char * str = (char*)malloc(len+1);
memcpy(str, &element[pos], len);
str[len] ='\0';
return str;
}
/* SDP parser callback */
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;
char *str;
switch (event->type){
case SDP_QUERY_ATTRIBUTE_VALUE:
value_event = (sdp_query_attribute_value_event_t*) event;
/* Handle new SDP record */
if (value_event->record_id != record_id) {
record_id = value_event->record_id;
printf("SDP Record: Nr: %d\n", record_id);
}
if (value_event->attribute_length <= attribute_value_buffer_size) {
attribute_value[value_event->data_offset] = value_event->data;
if ((uint16_t)(value_event->data_offset+1) == value_event->attribute_length) {
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;
uint32_t uuid = de_get_uuid32(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:
str = get_string_from_data_element(attribute_value);
printf("SDP Attribute: 0x%04x: %s\n", value_event->attribute_id, str);
free(str);
break;
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)) {
uint8_t *des_element;
uint8_t *element;
uint32_t uuid;
if (des_iterator_get_type(&des_list_it) != DE_DES) continue;
des_element = des_iterator_get_element(&des_list_it);
des_iterator_init(&prot_it, des_element);
element = des_iterator_get_element(&prot_it);
if (de_get_element_type(element) != DE_UUID) continue;
uuid = de_get_uuid32(element);
switch (uuid){
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), &bnep_l2cap_psm);
break;
case 0x000f:
if (!des_iterator_has_more(&prot_it)) continue;
des_iterator_next(&prot_it);
de_element_get_uint16(des_iterator_get_element(&prot_it), &bnep_version);
break;
default:
break;
}
}
printf("l2cap_psm 0x%04x, bnep_version 0x%04x\n", bnep_l2cap_psm, bnep_version);
/* Create BNEP connection */
bnep_connect(NULL, &remote, bnep_l2cap_psm, bnep_remote_uuid);
}
break;
default:
break;
}
}
} else {
fprintf(stderr, "SDP attribute value buffer size exceeded: available %d, required %d\n", attribute_value_buffer_size, value_event->attribute_length);
}
break;
case SDP_QUERY_COMPLETE:
complete_event = (sdp_query_complete_event_t*) event;
fprintf(stderr, "General query done with status %d.\n", complete_event->status);
break;
}
}
static void packet_handler (void * connection, uint8_t packet_type, uint16_t channel, uint8_t *packet, uint16_t size)
{
int rc;
uint8_t event;
bd_addr_t event_addr;
uint16_t uuid_source;
uint16_t uuid_dest;
uint16_t mtu;
switch (packet_type) {
case HCI_EVENT_PACKET:
event = packet[0];
switch (event) {
case BTSTACK_EVENT_STATE:
/* BT Stack activated, get started */
if (packet[2] == HCI_STATE_WORKING) {
/* Send a general query for BNEP Protocol ID */
printf("Start SDP BNEP query.\n");
sdp_general_query_for_uuid(remote, bnep_protocol_id);
}
break;
case HCI_EVENT_COMMAND_COMPLETE:
if (COMMAND_COMPLETE_EVENT(packet, hci_read_bd_addr)){
bt_flip_addr(event_addr, &packet[6]);
printf("BD-ADDR: %s\n", bd_addr_to_str(event_addr));
break;
}
break;
case HCI_EVENT_PIN_CODE_REQUEST:
// inform about pin code request
printf("Pin code request - using '0000'\n");
bt_flip_addr(event_addr, &packet[2]);
hci_send_cmd(&hci_pin_code_request_reply, &event_addr, 4, "0000");
break;
case HCI_EVENT_USER_CONFIRMATION_REQUEST:
// inform about user confirmation request
printf("SSP User Confirmation Request with numeric value '%06u'\n", READ_BT_32(packet, 8));
printf("SSP User Confirmation Auto accept\n");
break;
case BNEP_EVENT_INCOMING_CONNECTION:
// data: event(8), len(8), bnep source uuid (16), bnep destination uuid (16), remote_address (48)
uuid_source = READ_BT_16(packet, 2);
uuid_dest = READ_BT_16(packet, 4);
mtu = READ_BT_16(packet, 6);
bnep_cid = channel;
memcpy(&event_addr, &packet[8], 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);
/* 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_OPEN_CHANNEL_COMPLETE:
if (packet[2]) {
printf("BNEP channel open failed, status %02x\n", packet[2]);
} else {
// data: event(8), len(8), status (8), bnep source uuid (16), bnep destination uuid (16), remote_address (48)
uuid_source = READ_BT_16(packet, 3);
uuid_dest = READ_BT_16(packet, 5);
mtu = READ_BT_16(packet, 7);
bnep_cid = channel;
//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_TIMEOUT:
printf("BNEP channel timeout! Channel will be closed\n");
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;
case BNEP_EVENT_READY_TO_SEND:
/* Check for parked network packets and send it out now */
if (network_buffer_len > 0) {
bnep_send(bnep_cid, network_buffer, network_buffer_len);
network_buffer_len = 0;
/* Re-add the tap device data source */
run_loop_add_data_source(&tap_dev_ds);
}
break;
default:
break;
}
break;
case BNEP_DATA_PACKET:
/* Write out the ethernet frame to the tap device */
if (tap_fd > 0) {
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;
}
}
int btstack_main(int argc, const char * argv[]);
int btstack_main(int argc, const char * argv[]){
printf("Client HCI init done\n");
/* Initialize L2CAP */
l2cap_init();
l2cap_register_packet_handler(packet_handler);
/* Initialise BNEP */
bnep_init();
bnep_register_packet_handler(packet_handler);
bnep_register_service(NULL, BNEP_UUID_PANU, 1691); /* Minimum L2CAP MTU for bnep is 1691 bytes */
/* Turn on the device */
hci_power_control(HCI_POWER_ON);
/* Initialise SDP */
sdp_parser_init();
sdp_parser_register_callback(handle_sdp_client_query_result);
/* Start mainloop */
run_loop_execute();
return 0;
}
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