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#include "dbus_client.h"
#include "../protocol.h"
#include <sys/socket.h>
#include <sys/wait.h>
#include <unistd.h>
#include <poll.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
// TODO: Error checking for write/read
static bool gsr_dbus_client_wait_for_startup(gsr_dbus_client *self) {
struct pollfd poll_fd = {
.fd = self->socket_pair[0],
.events = POLLIN,
.revents = 0
};
for(;;) {
int poll_res = poll(&poll_fd, 1, 100);
if(poll_res > 0 && (poll_fd.revents & POLLIN)) {
char msg;
read(self->socket_pair[0], &msg, 1);
return true;
} else {
int status = 0;
int wait_result = waitpid(self->pid, &status, WNOHANG);
if(wait_result != 0) {
int exit_code = -1;
if(WIFEXITED(status))
exit_code = WEXITSTATUS(status);
fprintf(stderr, "gsr error: gsr_dbus_client_init: server side or never started, exit code: %d\n", exit_code);
self->pid = 0;
return false;
}
}
}
}
bool gsr_dbus_client_init(gsr_dbus_client *self, const char *screencast_restore_token) {
memset(self, 0, sizeof(*self));
if(socketpair(AF_UNIX, SOCK_STREAM, 0, self->socket_pair) == -1) {
fprintf(stderr, "gsr error: gsr_dbus_client_init: socketpair failed, error: %s\n", strerror(errno));
return false;
}
if(screencast_restore_token) {
self->screencast_restore_token = strdup(screencast_restore_token);
if(!self->screencast_restore_token) {
fprintf(stderr, "gsr error: gsr_dbus_client_init: failed to clone restore token\n");
gsr_dbus_client_deinit(self);
return false;
}
}
self->pid = fork();
if(self->pid == -1) {
fprintf(stderr, "gsr error: gsr_dbus_client_init: failed to fork process\n");
gsr_dbus_client_deinit(self);
return false;
} else if(self->pid == 0) { /* child */
char socket_pair_server_str[32];
snprintf(socket_pair_server_str, sizeof(socket_pair_server_str), "%d", self->socket_pair[1]);
const char *args[] = { "gsr-dbus-server", socket_pair_server_str, self->screencast_restore_token ? self->screencast_restore_token : "", NULL };
execvp(args[0], (char *const*)args);
fprintf(stderr, "gsr error: gsr_dbus_client_init: execvp failed, error: %s\n", strerror(errno));
_exit(127);
} else { /* parent */
if(!gsr_dbus_client_wait_for_startup(self)) {
gsr_dbus_client_deinit(self);
return false;
}
}
return true;
}
void gsr_dbus_client_deinit(gsr_dbus_client *self) {
for(int i = 0; i < 2; ++i) {
if(self->socket_pair[i] > 0) {
close(self->socket_pair[i]);
self->socket_pair[i] = -1;
}
}
if(self->screencast_restore_token) {
free(self->screencast_restore_token);
self->screencast_restore_token = NULL;
}
if(self->pid > 0) {
kill(self->pid, SIGKILL);
int status = 0;
waitpid(self->pid, &status, 0);
self->pid = 0;
}
}
int gsr_dbus_client_screencast_create_session(gsr_dbus_client *self, char *session_handle, size_t session_handle_size) {
const gsr_dbus_request_message request = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_REQ_CREATE_SESSION,
.create_session = (gsr_dbus_message_req_create_session) {}
};
write(self->socket_pair[0], &request, sizeof(request));
gsr_dbus_response_message response = {0};
read(self->socket_pair[0], &response, sizeof(response));
if(response.protocol_version != GSR_DBUS_PROTOCOL_VERSION) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_create_session: server uses protocol version %d while the client is using protocol version %d", response.protocol_version, GSR_DBUS_PROTOCOL_VERSION);
return -1;
}
if(response.type == GSR_DBUS_MESSAGE_RESP_ERROR) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_create_session: server return error: %s (%d)\n", response.error.message, (int)response.error.error_code);
return response.error.error_code;
}
if(response.type != GSR_DBUS_MESSAGE_RESP_CREATE_SESSION) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_create_session: received incorrect response type. Expected %d got %d\n", GSR_DBUS_MESSAGE_RESP_CREATE_SESSION, response.type);
return -1;
}
snprintf(session_handle, session_handle_size, "%s", response.create_session.session_handle);
return 0;
}
int gsr_dbus_client_screencast_select_sources(gsr_dbus_client *self, const char *session_handle, uint32_t capture_type, uint32_t cursor_mode) {
gsr_dbus_request_message request = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_REQ_SELECT_SOURCES,
.select_sources = (gsr_dbus_message_req_select_sources) {
.capture_type = capture_type,
.cursor_mode = cursor_mode
}
};
snprintf(request.select_sources.session_handle, sizeof(request.select_sources.session_handle), "%s", session_handle);
write(self->socket_pair[0], &request, sizeof(request));
gsr_dbus_response_message response = {0};
read(self->socket_pair[0], &response, sizeof(response));
if(response.protocol_version != GSR_DBUS_PROTOCOL_VERSION) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_select_sources: server uses protocol version %d while the client is using protocol version %d", response.protocol_version, GSR_DBUS_PROTOCOL_VERSION);
return -1;
}
if(response.type == GSR_DBUS_MESSAGE_RESP_ERROR) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_select_sources: server return error: %s (%d)\n", response.error.message, (int)response.error.error_code);
return response.error.error_code;
}
if(response.type != GSR_DBUS_MESSAGE_RESP_SELECT_SOURCES) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_select_sources: received incorrect response type. Expected %d got %d\n", GSR_DBUS_MESSAGE_RESP_SELECT_SOURCES, response.type);
return -1;
}
return 0;
}
int gsr_dbus_client_screencast_start(gsr_dbus_client *self, const char *session_handle, uint32_t *pipewire_node) {
*pipewire_node = 0;
gsr_dbus_request_message request = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_REQ_START,
.start = (gsr_dbus_message_req_start) {}
};
snprintf(request.start.session_handle, sizeof(request.start.session_handle), "%s", session_handle);
write(self->socket_pair[0], &request, sizeof(request));
gsr_dbus_response_message response = {0};
read(self->socket_pair[0], &response, sizeof(response));
if(response.protocol_version != GSR_DBUS_PROTOCOL_VERSION) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_start: server uses protocol version %d while the client is using protocol version %d", response.protocol_version, GSR_DBUS_PROTOCOL_VERSION);
return -1;
}
if(response.type == GSR_DBUS_MESSAGE_RESP_ERROR) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_start: server return error: %s (%d)\n", response.error.message, (int)response.error.error_code);
return response.error.error_code;
}
if(response.type != GSR_DBUS_MESSAGE_RESP_START) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_start: received incorrect response type. Expected %d got %d\n", GSR_DBUS_MESSAGE_RESP_START, response.type);
return -1;
}
if(self->screencast_restore_token) {
free(self->screencast_restore_token);
if(response.start.restore_token[0] == '\0')
self->screencast_restore_token = NULL;
else
self->screencast_restore_token = strdup(response.start.restore_token);
}
*pipewire_node = response.start.pipewire_node;
return 0;
}
bool gsr_dbus_client_screencast_open_pipewire_remote(gsr_dbus_client *self, const char *session_handle, int *pipewire_fd) {
*pipewire_fd = 0;
gsr_dbus_request_message request = {
.protocol_version = GSR_DBUS_PROTOCOL_VERSION,
.type = GSR_DBUS_MESSAGE_REQ_OPEN_PIPEWIRE_REMOTE,
.open_pipewire_remote = (gsr_dbus_message_req_open_pipewire_remote) {}
};
snprintf(request.open_pipewire_remote.session_handle, sizeof(request.open_pipewire_remote.session_handle), "%s", session_handle);
write(self->socket_pair[0], &request, sizeof(request));
gsr_dbus_response_message response = {0};
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)
};
const int bla = recvmsg(self->socket_pair[0], &message, MSG_WAITALL);
(void)bla;
if(response.protocol_version != GSR_DBUS_PROTOCOL_VERSION) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_open_pipewire_remote: server uses protocol version %d while the client is using protocol version %d", response.protocol_version, GSR_DBUS_PROTOCOL_VERSION);
return false;
}
if(response.type == GSR_DBUS_MESSAGE_RESP_ERROR) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_open_pipewire_remote: server return error: %s (%d)\n", response.error.message, (int)response.error.error_code);
return false;
}
if(response.type != GSR_DBUS_MESSAGE_RESP_OPEN_PIPEWIRE_REMOTE) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_open_pipewire_remote: received incorrect response type. Expected %d got %d\n", GSR_DBUS_MESSAGE_RESP_OPEN_PIPEWIRE_REMOTE, response.type);
return false;
}
struct cmsghdr *cmsg = CMSG_FIRSTHDR(&message);
if(!cmsg || cmsg->cmsg_type != SCM_RIGHTS) {
fprintf(stderr, "gsr error: gsr_dbus_client_screencast_open_pipewire_remote: returned message data is missing file descriptor\n");
return false;
}
memcpy(pipewire_fd, CMSG_DATA(cmsg), sizeof(*pipewire_fd));
return true;
}
const char* gsr_dbus_client_screencast_get_restore_token(gsr_dbus_client *self) {
return self->screencast_restore_token;
}
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