From: Luiz Augusto von Dentz <luiz.von.dentz@xxxxxxxxx> This adds replay support when uhid is in use and the input node is keep while disconnected: Fixes: https://github.com/bluez/bluez/issues/777 --- profiles/input/device.c | 173 +++++++++++++++++++++++++++++++++++++++- 1 file changed, 172 insertions(+), 1 deletion(-) diff --git a/profiles/input/device.c b/profiles/input/device.c index b622ee8cd681..4cb4870196dc 100644 --- a/profiles/input/device.c +++ b/profiles/input/device.c @@ -42,6 +42,8 @@ #include "src/sdp-client.h" #include "src/shared/timeout.h" #include "src/shared/uhid.h" +#include "src/shared/util.h" +#include "src/shared/queue.h" #include "device.h" #include "hidp_defs.h" @@ -55,6 +57,19 @@ enum reconnect_mode_t { RECONNECT_ANY }; +struct hidp_msg { + uint8_t hdr; + struct iovec *iov; +}; + +struct hidp_replay { + bool replaying; + struct queue *out; + struct queue *in; + struct queue *re_out; + struct queue *re_in; +}; + struct input_device { struct btd_service *service; struct btd_device *device; @@ -78,6 +93,7 @@ struct input_device { uint32_t report_rsp_id; bool virtual_cable_unplug; unsigned int idle_timer; + struct hidp_replay *replay; }; static int idle_timeout = 0; @@ -113,8 +129,30 @@ static bool input_device_bonded(struct input_device *idev) btd_device_get_bdaddr_type(idev->device)); } +static void hidp_msg_free(void *data) +{ + struct hidp_msg *msg = data; + + util_iov_free(msg->iov, 1); + free(msg); +} + +static void hidp_replay_free(struct hidp_replay *replay) +{ + if (!replay) + return; + + queue_destroy(replay->re_in, NULL); + queue_destroy(replay->in, hidp_msg_free); + queue_destroy(replay->re_out, NULL); + queue_destroy(replay->out, hidp_msg_free); + free(replay); +} + static void input_device_free(struct input_device *idev) { + hidp_replay_free(idev->replay); + bt_uhid_unref(idev->uhid); btd_service_unref(idev->service); btd_device_unref(idev->device); @@ -171,6 +209,10 @@ static int uhid_disconnect(struct input_device *idev, bool force) if (!idev->virtual_cable_unplug && !force) return 0; + /* Destroy replay messages */ + hidp_replay_free(idev->replay); + idev->replay = NULL; + bt_uhid_unregister_all(idev->uhid); err = bt_uhid_destroy(idev->uhid); @@ -246,12 +288,95 @@ static bool hidp_send_message(struct input_device *idev, GIOChannel *chan, return true; } +static void hidp_replay_send(struct input_device *idev) +{ + struct hidp_msg *msg; + + if (!idev->replay || !idev->replay->replaying) + return; + + msg = queue_pop_head(idev->replay->re_out); + if (!msg) { + DBG("uhid replay finished"); + idev->replay->replaying = false; + return; + } + + DBG("hdr 0x%02x size %zu", msg->hdr, msg->iov->iov_len); + + hidp_send_message(idev, NULL, msg->hdr, msg->iov->iov_base, + msg->iov->iov_len); +} + +static void hidp_replay_recv(struct input_device *idev, uint8_t hdr, + const uint8_t *data, size_t size) +{ + struct hidp_msg *msg; + + if (!idev->replay || !idev->replay->replaying) + return; + + msg = queue_pop_head(idev->replay->re_in); + + if (msg && (msg->hdr != hdr || msg->iov->iov_len != size || + memcmp(msg->iov->iov_base, data, size))) + error("uhid replay input error... discarding"); + + hidp_replay_send(idev); +} + +static struct hidp_replay *hidp_replay_new(void) +{ + struct hidp_replay *replay = new0(struct hidp_replay, 1); + + replay->out = queue_new(); + replay->in = queue_new(); + + return replay; +} + +static void hidp_record_message(struct input_device *idev, bool out, + uint8_t hdr, const uint8_t *data, size_t size) +{ + struct hidp_msg *msg; + struct iovec iov = { (void *)data, size }; + + /* Only record messages if uhid has been created */ + if (!bt_uhid_created(idev->uhid)) + return; + + if (idev->replay && idev->replay->replaying) { + if (!out) + hidp_replay_recv(idev, hdr, data, size); + return; + } + + if (!idev->replay) + idev->replay = hidp_replay_new(); + + msg = new0(struct hidp_msg, 1); + msg->hdr = hdr; + msg->iov = util_iov_dup(&iov, 1); + + if (out) { + DBG("output[%u]: hdr 0x%02x size %zu", + queue_length(idev->replay->out), hdr, size); + queue_push_tail(idev->replay->out, msg); + } else { + DBG("input[%u]: hdr 0x%02x size %zu", + queue_length(idev->replay->in), hdr, size); + queue_push_tail(idev->replay->in, msg); + } +} + static bool hidp_send_ctrl_message(struct input_device *idev, uint8_t hdr, const uint8_t *data, size_t size) { if (hdr == (HIDP_TRANS_HID_CONTROL | HIDP_CTRL_VIRTUAL_CABLE_UNPLUG)) idev->virtual_cable_unplug = true; + hidp_record_message(idev, true, hdr, data, size); + return hidp_send_message(idev, idev->ctrl_io, hdr, data, size); } @@ -558,6 +683,12 @@ static bool hidp_recv_ctrl_message(GIOChannel *chan, struct input_device *idev) type = hdr & HIDP_HEADER_TRANS_MASK; param = hdr & HIDP_HEADER_PARAM_MASK; + /* While replaying don't involve the driver since it will likely get + * confused with messages it already things it has received. + */ + if (idev->replay && idev->replay->replaying) + goto done; + switch (type) { case HIDP_TRANS_HANDSHAKE: hidp_recv_ctrl_handshake(idev, param); @@ -575,6 +706,9 @@ static bool hidp_recv_ctrl_message(GIOChannel *chan, struct input_device *idev) break; } +done: + hidp_record_message(idev, false, hdr, data + 1, len - 1); + return true; } @@ -973,12 +1107,49 @@ static int ioctl_disconnect(struct input_device *idev, uint32_t flags) return err; } +static void queue_append(void *data, void *user_data) +{ + queue_push_tail(user_data, data); +} + +static struct queue *queue_dup(struct queue *q) +{ + struct queue *dup; + + if (!q || queue_isempty(q)) + return NULL; + + dup = queue_new(); + + queue_foreach(q, queue_append, dup); + + return dup; +} + +static void hidp_replay_init(struct input_device *idev) +{ + if (!idev->replay || idev->replay->replaying) + return; + + idev->replay->replaying = true; + + queue_destroy(idev->replay->re_in, NULL); + idev->replay->re_in = queue_dup(idev->replay->in); + + queue_destroy(idev->replay->re_out, NULL); + idev->replay->re_out = queue_dup(idev->replay->out); + + hidp_replay_send(idev); +} + static int uhid_connadd(struct input_device *idev, struct hidp_connadd_req *req) { int err; - if (bt_uhid_created(idev->uhid)) + if (bt_uhid_created(idev->uhid)) { + hidp_replay_init(idev); return 0; + } err = bt_uhid_create(idev->uhid, req->name, &idev->src, &idev->dst, req->vendor, req->product, req->version, -- 2.44.0
