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bt_device.cc
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557 lines (458 loc) · 11.5 KB
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#include "bt_device.h"
#include "bt_adapter.h"
#include "bt_command.h"
#include "bt_channel.h"
#include <unistd.h>
#include <fcntl.h>
namespace bt
{
device::device(adapter &hci, const bdaddr_t &addr)
: addr(addr), hci(hci)
{
hci.attach(*this);
}
device::~device()
{
hci.detach(*this);
}
void device::connect(u16 packet_type, u8 page_scan_rep_mode, u16 clock_offset, u8 role)
{
command cmd(hci, 0x01, 0x0005);
cmd.write(addr);
cmd.write_u16(htobs(packet_type));
cmd.write_u8(page_scan_rep_mode);
cmd.write_u8(0x00);
cmd.write_u16(htobs(clock_offset));
cmd.write_u8(role);
valid_status(cmd.run<u8>());
}
void device::accept(u8 role)
{
accepting = role;
}
void device::authenticate()
{
command cmd(hci, 0x01, 0x0011);
cmd.write_u16(htobs(handle));
valid_status(cmd.run<u8>());
}
void device::encrypt(u8 mode)
{
command cmd(hci, 0x01, 0x0013);
cmd.write_u16(htobs(handle));
cmd.write_u8(mode);
valid_status(cmd.run<u8>());
}
void device::qos_setup(u8 flags, u8 service_type, u32 token_rate, u32 peak_bw, u32 latency, u32 delay_variation)
{
command cmd(hci, 0x02, 0x0007);
cmd.write_u16(htobs(handle));
cmd.write_u8(flags);
cmd.write_u8(service_type);
cmd.write_u32(htobl(token_rate));
cmd.write_u32(htobl(peak_bw));
cmd.write_u32(htobl(latency));
cmd.write_u32(htobl(delay_variation));
valid_status(cmd.run<u8>());
}
void device::disconnect(u8 reason)
{
command cmd(hci, 0x01, 0x0006);
cmd.write_u16(htobs(handle));
cmd.write_u8(reason);
valid_status(cmd.run<u8>());
}
void device::connect(channel &ch, u16 psm)
{
auto local_cid = htobs(next_cid++);
ch.handle = handle;
channels.emplace(local_cid, ch);
l2cap_conn_req req;
req.scid = local_cid;
req.psm = htobs(psm);
auto ident = l2cap_cmd(L2CAP_CONN_REQ, req);
l2cap_conn_rsp *rsp;
do
{
rsp = l2cap_await<l2cap_conn_rsp>(ident);
} while (btohs(rsp->result) == 0x0001);
if (rsp->result != 0x0000)
{
printf("l2cap result %04x\n", rsp->result);
throw std::runtime_error("l2cap connection failed");
}
ch.status = channel_status::CONFIG;
ch.remote_cid = rsp->dcid;
}
void device::accept(channel &ch, u16 psm)
{
ch.handle = handle;
promise<std::pair<u16, u16>> accept;
accepting_psms.emplace(psm, &accept);
auto cids = accept.wait();
channels.emplace(cids.first, ch);
ch.remote_cid = cids.second;
ch.status = channel_status::CONFIG;
printf("accepted %04x (%04x)\n", cids.first, cids.second);
}
void device::acquire_slot()
{
// printf("send %zu %zu\n", full_slots, max_slots);
// auto start = std::chrono::high_resolution_clock::now();
while (full_slots >= total_slots)
{
// printf("waiting\n");
slots_changed.wait();
}
// auto end = std::chrono::high_resolution_clock::now();
// printf("sending %ld\n", std::chrono::duration_cast<std::chrono::nanoseconds>(end - start).count());
++full_slots;
slots_changed.notify();
}
void device::l2cap_send(u8 ident, u8 code, const void *src, usize size)
{
acquire_slot();
frame pkt(hci.send_buffer, sizeof(hci.send_buffer));
pkt.write_u8(HCI_ACLDATA_PKT);
auto acl = pkt.advance<hci_acl_hdr>();
acl->handle = handle;
acl->dlen = htobs(sizeof(l2cap_hdr) + sizeof(l2cap_cmd_hdr) + size);
auto l2cap = pkt.advance<l2cap_hdr>();
l2cap->cid = htobs(0x01);
l2cap->len = htobs(sizeof(l2cap_cmd_hdr) + size);
auto cmd = pkt.advance<l2cap_cmd_hdr>();
cmd->code = code;
cmd->ident = ident;
cmd->len = htobs(size);
pkt.write(src, size);
hci.send(pkt.size);
}
void device::acldata(block &pkt)
{
auto hdr = pkt.advance<l2cap_hdr>();
if (!hdr)
return;
static const std::vector<void (device::*)(u8, block &)> handlers{
/* 00 */ nullptr,
/* 02 */ &device::l2cap<l2cap_conn_req>,
/* 04 */ &device::l2cap<l2cap_conf_req>,
/* 06 */ &device::l2cap<l2cap_disconn_req>,
/* 08 */ &device::l2cap, // echo
/* 0a */ &device::l2cap<l2cap_info_req>,
/* 0c */ &device::l2cap<l2cap_create_req>,
/* 0e */ &device::l2cap<l2cap_move_req>,
/* 10 */ &device::l2cap<l2cap_move_cfm>,
};
if (btohs(hdr->cid) == 0x01)
{
auto cmd = pkt.advance<l2cap_cmd_hdr>();
if (!cmd)
return;
if (cmd->code & 0x01)
{
auto req = l2cap_commands.find(cmd->ident);
if (req == l2cap_commands.end())
return;
req->second->resolve(pkt);
}
else
{
auto handler = handlers[cmd->code >> 1];
if (handler == nullptr)
return;
(this->*handler)(cmd->ident, pkt);
}
}
else
{
auto channel = channels.find(hdr->cid);
if (channel == channels.end())
return;
channel->second.data.emit(pkt);
}
}
void device::l2cap(u8 ident, l2cap_conn_req *req)
{
auto accept = accepting_psms.find(btohs(req->psm));
l2cap_conn_rsp rsp;
rsp.scid = req->scid;
if (accept == accepting_psms.end())
{
rsp.dcid = 0;
rsp.result = htobs(0x0002);
rsp.status = htobs(0x0000);
l2cap_reply(ident, L2CAP_CONN_RSP, rsp);
}
else
{
auto local_cid = htobs(next_cid++);
rsp.dcid = local_cid;
rsp.status = htobs(0x0000);
rsp.result = htobs(0x0000);
l2cap_reply(ident, L2CAP_CONN_RSP, rsp);
accept->second->resolve(std::make_pair(local_cid, (u16)rsp.scid));
accepting_psms.erase(accept);
}
}
void device::l2cap(u8 ident, l2cap_conf_req *req)
{
printf("conf req %04x\n", req->dcid);
auto ch = channels.find(req->dcid);
if (ch == channels.end() || (ch->second.status != channel_status::OPEN &&
ch->second.status != channel_status::CONFIG))
{
u8 buffer[6];
frame reject(buffer, sizeof(buffer));
reject.write_u16(htobs(0x0002));
reject.write_u16(0x0000);
reject.write_u16(req->dcid);
l2cap_reply(ident, L2CAP_COMMAND_REJ, buffer);
}
else
{
l2cap_conf_rsp rsp;
rsp.scid = ch->second.remote_cid;
rsp.flags = htobs(0x0000);
rsp.result = htobs(0x0000);
l2cap_reply(ident, L2CAP_CONF_RSP, rsp);
ch->second.handshake.resolve();
}
}
void device::l2cap(u8 ident, l2cap_disconn_req *req)
{
auto ch = channels.find(req->dcid);
if (ch == channels.end())
{
u8 buffer[6];
frame reject(buffer, sizeof(buffer));
reject.write_u16(htobs(0x0002));
reject.write_u16(req->scid);
reject.write_u16(req->dcid);
l2cap_reply(ident, L2CAP_COMMAND_REJ, buffer);
}
else
{
u8 buffer[4];
frame rsp(buffer, sizeof(buffer));
rsp.write_u16(req->dcid);
rsp.write_u16(req->scid);
l2cap_reply(ident, L2CAP_DISCONN_RSP, buffer);
ch->second.data.emit(block());
ch->second.status = channel_status::CLOSED;
}
}
void device::l2cap(u8 ident, block &pkt)
{
l2cap_send(ident, L2CAP_ECHO_RSP, pkt.data, pkt.size);
}
void device::l2cap(u8 ident, l2cap_info_req *req)
{
u8 buffer[L2CAP_INFO_RSP_SIZE];
frame rsp_pkt(buffer, sizeof(buffer));
auto rsp = rsp_pkt.advance<l2cap_info_rsp>();
rsp->type = req->type;
rsp->result = htobs(0x0001);
l2cap_reply(ident, L2CAP_INFO_RSP, buffer);
}
void device::l2cap(u8 ident, l2cap_create_req *req)
{
}
void device::l2cap(u8 ident, l2cap_move_req *req)
{
}
void device::l2cap(u8 ident, l2cap_move_cfm *req)
{
}
void device::event(evt_conn_complete *evt)
{
handle = evt->handle;
hci.attach(*this);
connected.notify();
}
void device::event(evt_conn_request *evt)
{
if (accepting < 0)
{
command cmd(hci, 0x01, 0x000A);
cmd.write(addr);
cmd.write_u8(0x13);
valid_status(cmd.run<u8>());
}
else
{
command cmd(hci, 0x01, 0x0009);
cmd.write(addr);
cmd.write_u8(accepting);
valid_status(cmd.run<u8>());
}
}
void device::event(evt_disconn_complete *evt)
{
handle = 0;
}
void device::event(evt_auth_complete *evt)
{
authenticated.notify();
}
void device::event(evt_remote_name_req_complete *evt)
{
}
void device::event(evt_encrypt_change *evt)
{
encrypted.notify();
}
void device::event(evt_change_conn_link_key_complete *evt)
{
}
void device::event(evt_master_link_key_complete *evt)
{
}
void device::event(evt_read_remote_features_complete *evt)
{
}
void device::event(evt_read_remote_version_complete *evt)
{
}
void device::event(evt_qos_setup_complete *evt)
{
}
void device::event(evt_flush_occured *evt)
{
}
void device::event(evt_role_change *evt)
{
}
void device::event(evt_mode_change *evt)
{
// if (evt->mode & 0x02)
// {
// command cmd(hci, 0x02, 0x004);
// cmd.write_u16(handle);
// cmd.send();
// }
}
void device::event(evt_pin_code_req *evt)
{
command cmd(hci, 0x01, 0x000e);
cmd.write(addr);
valid_status(cmd.run<u8>());
}
void device::event(evt_link_key_req *evt)
{
char filename[9 + 18];
strcpy(filename, "link_key/");
ba2str(&addr, filename + 9);
int fd = open(filename, O_RDONLY);
if (fd < 0)
{
command cmd(hci, 0x01, 0x000C);
cmd.write(addr);
cmd.send();
}
else
{
u8 link_key[16];
read(fd, link_key, sizeof(link_key));
close(fd);
command cmd(hci, 0x01, 0x000B);
cmd.write(addr);
cmd.write(link_key);
cmd.send();
}
}
void device::event(evt_link_key_notify *evt)
{
char filename[9 + 18];
strcpy(filename, "link_key/");
ba2str(&addr, filename + 9);
filename[9 + 17] = '\0';
int fd = open(filename, O_WRONLY | O_TRUNC | O_CREAT);
if (fd < 0)
{
perror("failed to save link key");
return;
}
write(fd, evt->link_key, sizeof(evt->link_key));
close(fd);
}
void device::event(evt_max_slots_change *evt)
{
total_slots = evt->max_slots;
slots_changed.notify();
}
void device::event(evt_read_clock_offset_complete *evt)
{
}
void device::event(evt_conn_ptype_changed *evt)
{
}
void device::event(evt_qos_violation *evt)
{
}
void device::event(evt_pscan_rep_mode_change *evt)
{
}
void device::event(evt_flow_spec_complete *evt)
{
}
void device::event(evt_read_remote_ext_features_complete *evt)
{
}
void device::event(evt_sync_conn_complete *evt)
{
}
void device::event(evt_sync_conn_changed *evt)
{
}
void device::event(evt_sniff_subrating *evt)
{
}
void device::event(evt_encryption_key_refresh_complete *evt)
{
}
void device::event(evt_io_capability_request *evt)
{
command cmd(hci, 0x01, 0x002b);
cmd.write(addr);
cmd.write_u8(0x03);
cmd.write_u8(0x00);
cmd.write_u8(0x00);
valid_status(cmd.run<u8>());
}
void device::event(evt_io_capability_response *evt)
{
}
void device::event(evt_user_confirm_request *evt)
{
command cmd(hci, 0x01, 0x002C); // 0x002D: deny. 0x002C: accept
cmd.write(addr);
valid_status(cmd.run<u8>());
}
void device::event(evt_user_passkey_request *evt)
{
}
void device::event(evt_remote_oob_data_request *evt)
{
}
void device::event(evt_simple_pairing_complete *evt)
{
}
void device::event(evt_link_supervision_timeout_changed *evt)
{
}
void device::event(evt_enhanced_flush_complete *evt)
{
}
void device::event(evt_user_passkey_notify *evt)
{
}
void device::event(evt_keypress_notify *evt)
{
}
void device::event(evt_remote_host_features_notify *evt)
{
}
void device::event(evt_flow_spec_modify_complete *evt)
{
}
} // namespace bt