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#include "../dbus_impl.h"
#include "../protocol.h"
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/socket.h>
/* TODO: Error check write/read */
static int handle_create_session(gsr_dbus *dbus, int rpc_fd, const gsr_dbus_message_req_create_session *create_session) {
(void)create_session;
char *session_handle = NULL;
const int status = gsr_dbus_screencast_create_session(dbus, &session_handle);
if(status == 0) {
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_CREATE_SESSION,
.create_session = (gsr_dbus_message_resp_create_session) {}
};
snprintf(response.create_session.session_handle, sizeof(response.create_session.session_handle), "%s", session_handle);
free(session_handle);
write(rpc_fd, &response, sizeof(response));
}
return status;
}
static int handle_select_sources(gsr_dbus *dbus, int rpc_fd, const gsr_dbus_message_req_select_sources *select_sources) {
const int status = gsr_dbus_screencast_select_sources(dbus, select_sources->session_handle, select_sources->capture_type, select_sources->cursor_mode);
if(status == 0) {
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_SELECT_SOURCES,
.select_sources = (gsr_dbus_message_resp_select_sources) {}
};
write(rpc_fd, &response, sizeof(response));
}
return status;
}
static int handle_start(gsr_dbus *dbus, int rpc_fd, const gsr_dbus_message_req_start *start) {
uint32_t pipewire_node = 0;
const int status = gsr_dbus_screencast_start(dbus, start->session_handle, &pipewire_node);
if(status == 0) {
const char *screencast_restore_token = gsr_dbus_screencast_get_restore_token(dbus);
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_START,
.start = (gsr_dbus_message_resp_start) {
.pipewire_node = pipewire_node
}
};
snprintf(response.start.restore_token, sizeof(response.start.restore_token), "%s", screencast_restore_token ? screencast_restore_token : "");
write(rpc_fd, &response, sizeof(response));
}
return status;
}
static bool handle_open_pipewire_remote(gsr_dbus *dbus, int rpc_fd, const gsr_dbus_message_req_open_pipewire_remote *open_pipewire_remote) {
int pipewire_fd = 0;
const bool success = gsr_dbus_screencast_open_pipewire_remote(dbus, open_pipewire_remote->session_handle, &pipewire_fd);
if(success) {
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_OPEN_PIPEWIRE_REMOTE,
.open_pipewire_remote = (gsr_dbus_message_resp_open_pipewire_remote) {}
};
struct iovec iov = {
.iov_base = &response,
.iov_len = sizeof(response)
};
char msg_control[CMSG_SPACE(sizeof(int))];
struct msghdr message = {
.msg_iov = &iov,
.msg_iovlen = 1,
.msg_control = msg_control,
.msg_controllen = sizeof(msg_control)
};
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&message);
cmsg->cmsg_level = SOL_SOCKET;
cmsg->cmsg_type = SCM_RIGHTS;
cmsg->cmsg_len = CMSG_LEN(sizeof(int));
int *fds = (int*)CMSG_DATA(cmsg);
fds[0] = pipewire_fd;
message.msg_controllen = cmsg->cmsg_len;
sendmsg(rpc_fd, &message, 0);
}
return success;
}
int main(int argc, char **argv) {
if(argc != 3) {
fprintf(stderr, "usage: gsr-dbus-server <rpc-fd> <screencast-restore-token>\n");
return 1;
}
const char *rpc_fd_str = argv[1];
const char *screencast_restore_token = argv[2];
int rpc_fd = -1;
if(sscanf(rpc_fd_str, "%d", &rpc_fd) != 1) {
fprintf(stderr, "gsr-dbus-server error: rpc-fd is not a number: %s\n", rpc_fd_str);
return 1;
}
if(screencast_restore_token[0] == '\0')
screencast_restore_token = NULL;
gsr_dbus dbus;
if(!gsr_dbus_init(&dbus, screencast_restore_token))
return 1;
/* Tell client we have started up */
write(rpc_fd, "S", 1);
gsr_dbus_request_message request;
for(;;) {
read(rpc_fd, &request, sizeof(request));
if(request.protocol_version != GSR_DBUS_PROTOCOL_VERSION) {
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_ERROR,
.error = (gsr_dbus_message_resp_error) {
.error_code = 1
}
};
snprintf(response.error.message, sizeof(response.error.message), "Client uses protocol version %d while the server is using protocol version %d", request.protocol_version, GSR_DBUS_PROTOCOL_VERSION);
fprintf(stderr, "gsr-dbus-server error: %s\n", response.error.message);
write(rpc_fd, &response, sizeof(response));
continue;
}
int status = 0;
switch(request.type) {
case GSR_DBUS_MESSAGE_REQ_CREATE_SESSION: {
status = handle_create_session(&dbus, rpc_fd, &request.create_session);
break;
}
case GSR_DBUS_MESSAGE_REQ_SELECT_SOURCES: {
status = handle_select_sources(&dbus, rpc_fd, &request.select_sources);
break;
}
case GSR_DBUS_MESSAGE_REQ_START: {
status = handle_start(&dbus, rpc_fd, &request.start);
break;
}
case GSR_DBUS_MESSAGE_REQ_OPEN_PIPEWIRE_REMOTE: {
if(!handle_open_pipewire_remote(&dbus, rpc_fd, &request.open_pipewire_remote))
status = -1;
break;
}
}
if(status != 0) {
gsr_dbus_response_message response = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_RESP_ERROR,
.error = (gsr_dbus_message_resp_error) {
.error_code = status
}
};
snprintf(response.error.message, sizeof(response.error.message), "%s", "Failed to handle request");
write(rpc_fd, &response, sizeof(response));
}
}
gsr_dbus_deinit(&dbus);
return 0;
}
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