#include <sys/ioctl.h>
#include <sys/time.h>
#include <sys/event.h>
#include <sys/types.h>
#include <bluetooth.h>
#include <errno.h>
#include <string.h>
#include <syslog.h>
#include <unistd.h>
#include "bthcid.h"
static int process_pin_code_request_event
(int, struct sockaddr_bt *, bdaddr_t *);
static int process_link_key_request_event
(int, struct sockaddr_bt *, bdaddr_t *);
static int process_link_key_notification_event
(int, struct sockaddr_bt *, hci_link_key_notification_ep *);
static int send_link_key_reply
(int, struct sockaddr_bt *, bdaddr_t *, uint8_t *);
static int send_hci_cmd
(int, struct sockaddr_bt *, uint16_t, size_t, void *);
static char dev_name[HCI_DEVNAME_SIZE];
int
init_hci(bdaddr_t *bdaddr)
{
struct sockaddr_bt sa;
struct hci_filter filter;
struct kevent change;
struct timespec timeout = { 0, 0 };
int hci;
hci = socket(PF_BLUETOOTH, SOCK_RAW, BTPROTO_HCI);
if (hci < 0)
return -1;
memset(&sa, 0, sizeof(sa));
sa.bt_len = sizeof(sa);
sa.bt_family = AF_BLUETOOTH;
bdaddr_copy(&sa.bt_bdaddr, bdaddr);
if (bind(hci, (struct sockaddr *)&sa, sizeof(sa)) < 0) {
close(hci);
return -1;
}
memset(&filter, 0, sizeof(filter));
hci_filter_set(HCI_EVENT_PIN_CODE_REQ, &filter);
hci_filter_set(HCI_EVENT_LINK_KEY_REQ, &filter);
hci_filter_set(HCI_EVENT_LINK_KEY_NOTIFICATION, &filter);
if (setsockopt(hci, BTPROTO_HCI, SO_HCI_EVT_FILTER,
(const void *)&filter, sizeof(filter)) < 0) {
close(hci);
return -1;
}
EV_SET(&change, hci, EVFILT_READ, EV_ADD, 0, 0, NULL);
if (kevent(hci_kq, &change, 1, NULL, 0, &timeout) == -1) {
close(hci);
return -1;
}
return hci;
}
void
process_hci(int sock)
{
char buffer[HCI_EVENT_PKT_SIZE];
hci_event_hdr_t *event = (hci_event_hdr_t *)buffer;
struct sockaddr_bt addr;
int n;
socklen_t size;
size = sizeof(addr);
n = recvfrom(sock, buffer, sizeof(buffer), 0,
(struct sockaddr *) &addr, &size);
if (n < 0) {
syslog(LOG_ERR, "Could not receive from HCI socket: %m");
return;
}
if (event->type != HCI_EVENT_PKT) {
syslog(LOG_ERR, "Received unexpected HCI packet, "
"type=%#x", event->type);
return;
}
if (!bt_devname(dev_name, &addr.bt_bdaddr))
strlcpy(dev_name, "unknown", sizeof(dev_name));
switch (event->event) {
case HCI_EVENT_PIN_CODE_REQ:
process_pin_code_request_event(sock, &addr,
(bdaddr_t *)(event + 1));
break;
case HCI_EVENT_LINK_KEY_REQ:
process_link_key_request_event(sock, &addr,
(bdaddr_t *)(event + 1));
break;
case HCI_EVENT_LINK_KEY_NOTIFICATION:
process_link_key_notification_event(sock, &addr,
(hci_link_key_notification_ep *)(event + 1));
break;
default:
syslog(LOG_ERR, "Received unexpected HCI event, "
"event=%#x", event->event);
break;
}
return;
}
static int
process_pin_code_request_event(int sock, struct sockaddr_bt *addr,
bdaddr_t *bdaddr)
{
uint8_t *pin;
uint8_t *pin2;
syslog(LOG_DEBUG, "Got PIN_Code_Request event from %s, "
"remote bdaddr %s",
dev_name,
bt_ntoa(bdaddr, NULL));
pin = lookup_pin(&addr->bt_bdaddr, bdaddr);
if (pin != NULL)
return send_pin_code_reply(sock, addr, bdaddr, pin);
pin2 = lookup_pin_conf(&addr->bt_bdaddr, bdaddr);
if (pin2 != NULL) {
return send_pin_code_reply(sock, addr, bdaddr, pin2);
}
if (send_client_request(&addr->bt_bdaddr, bdaddr, sock) == 0)
return send_pin_code_reply(sock, addr, bdaddr, NULL);
return 0;
}
static int
process_link_key_request_event(int sock, struct sockaddr_bt *addr,
bdaddr_t *bdaddr)
{
uint8_t *key;
syslog(LOG_DEBUG,
"Got Link_Key_Request event from %s, remote bdaddr %s",
dev_name, bt_ntoa(bdaddr, NULL));
key = lookup_key(&addr->bt_bdaddr, bdaddr);
if (key != NULL) {
syslog(LOG_DEBUG, "Found Key, remote bdaddr %s",
bt_ntoa(bdaddr, NULL));
return send_link_key_reply(sock, addr, bdaddr, key);
}
syslog(LOG_DEBUG, "Could not find link key for remote bdaddr %s",
bt_ntoa(bdaddr, NULL));
return send_link_key_reply(sock, addr, bdaddr, NULL);
}
int
send_pin_code_reply(int sock, struct sockaddr_bt *addr,
bdaddr_t *bdaddr, uint8_t *pin)
{
int n;
if (pin != NULL) {
hci_pin_code_rep_cp cp;
syslog(LOG_DEBUG, "Sending PIN_Code_Reply to %s "
"for remote bdaddr %s",
dev_name,
bt_ntoa(bdaddr, NULL));
bdaddr_copy(&cp.bdaddr, bdaddr);
memcpy(cp.pin, pin, HCI_PIN_SIZE);
n = HCI_PIN_SIZE;
while (n > 0 && pin[n - 1] == 0)
n--;
cp.pin_size = n;
n = send_hci_cmd(sock, addr,
HCI_CMD_PIN_CODE_REP, sizeof(cp), &cp);
} else {
syslog(LOG_DEBUG, "Sending PIN_Code_Negative_Reply to %s "
"for remote bdaddr %s",
dev_name,
bt_ntoa(bdaddr, NULL));
n = send_hci_cmd(sock, addr, HCI_CMD_PIN_CODE_NEG_REP,
sizeof(bdaddr_t), bdaddr);
}
if (n < 0) {
syslog(LOG_ERR, "Could not send PIN code reply to %s "
"for remote bdaddr %s: %m",
dev_name,
bt_ntoa(bdaddr, NULL));
return -1;
}
return 0;
}
static int
send_link_key_reply(int sock, struct sockaddr_bt *addr,
bdaddr_t *bdaddr, uint8_t *key)
{
int n;
if (key != NULL) {
hci_link_key_rep_cp cp;
bdaddr_copy(&cp.bdaddr, bdaddr);
memcpy(&cp.key, key, sizeof(cp.key));
syslog(LOG_DEBUG, "Sending Link_Key_Reply to %s "
"for remote bdaddr %s",
dev_name, bt_ntoa(bdaddr, NULL));
n = send_hci_cmd(sock, addr, HCI_CMD_LINK_KEY_REP, sizeof(cp), &cp);
} else {
hci_link_key_neg_rep_cp cp;
bdaddr_copy(&cp.bdaddr, bdaddr);
syslog(LOG_DEBUG, "Sending Link_Key_Negative_Reply to %s "
"for remote bdaddr %s",
dev_name, bt_ntoa(bdaddr, NULL));
n = send_hci_cmd(sock, addr, HCI_CMD_LINK_KEY_NEG_REP, sizeof(cp), &cp);
}
if (n < 0) {
syslog(LOG_ERR, "Could not send link key reply to %s "
"for remote bdaddr %s: %m",
dev_name, bt_ntoa(bdaddr, NULL));
return -1;
}
return 0;
}
static int
process_link_key_notification_event(int sock __unused, struct sockaddr_bt *addr,
hci_link_key_notification_ep *ep)
{
syslog(LOG_DEBUG, "Got Link_Key_Notification event from %s, "
"remote bdaddr %s",
dev_name,
bt_ntoa(&ep->bdaddr, NULL));
save_key(&addr->bt_bdaddr, &ep->bdaddr, ep->key);
return 0;
}
static int
send_hci_cmd(int sock, struct sockaddr_bt *sa, uint16_t opcode, size_t len, void *buf)
{
char msg[HCI_CMD_PKT_SIZE];
hci_cmd_hdr_t *h = (hci_cmd_hdr_t *)msg;
h->type = HCI_CMD_PKT;
h->opcode = htole16(opcode);
h->length = len;
if (len > 0)
memcpy(msg + sizeof(hci_cmd_hdr_t), buf, len);
return sendto(sock, msg, sizeof(hci_cmd_hdr_t) + len, 0,
(struct sockaddr *)sa, sizeof(*sa));
}
