2 #define I3__FILE__ "ipc.c"
4 * vim:ts=4:sw=4:expandtab
6 * i3 - an improved dynamic tiling window manager
7 * © 2009-2012 Michael Stapelberg and contributors (see also: LICENSE)
9 * ipc.c: UNIX domain socket IPC (initialization, client handling, protocol).
13 #include "yajl_utils.h"
15 #include <sys/socket.h>
20 #include <yajl/yajl_gen.h>
21 #include <yajl/yajl_parse.h>
23 char *current_socketpath = NULL;
25 TAILQ_HEAD(ipc_client_head, ipc_client) all_clients = TAILQ_HEAD_INITIALIZER(all_clients);
28 * Puts the given socket file descriptor into non-blocking mode or dies if
29 * setting O_NONBLOCK failed. Non-blocking sockets are a good idea for our
30 * IPC model because we should by no means block the window manager.
33 static void set_nonblock(int sockfd) {
34 int flags = fcntl(sockfd, F_GETFL, 0);
36 if (fcntl(sockfd, F_SETFL, flags) < 0)
37 err(-1, "Could not set O_NONBLOCK");
41 * Emulates mkdir -p (creates any missing folders)
44 static bool mkdirp(const char *path) {
45 if (mkdir(path, S_IRWXU | S_IRGRP | S_IXGRP | S_IROTH | S_IXOTH) == 0)
47 if (errno != ENOENT) {
48 ELOG("mkdir(%s) failed: %s\n", path, strerror(errno));
51 char *copy = sstrdup(path);
52 /* strip trailing slashes, if any */
53 while (copy[strlen(copy)-1] == '/')
54 copy[strlen(copy)-1] = '\0';
56 char *sep = strrchr(copy, '/');
64 result = mkdirp(path);
71 * Sends the specified event to all IPC clients which are currently connected
72 * and subscribed to this kind of event.
75 void ipc_send_event(const char *event, uint32_t message_type, const char *payload) {
77 TAILQ_FOREACH(current, &all_clients, clients) {
78 /* see if this client is interested in this event */
79 bool interested = false;
80 for (int i = 0; i < current->num_events; i++) {
81 if (strcasecmp(current->events[i], event) != 0)
89 ipc_send_message(current->fd, strlen(payload), message_type, (const uint8_t*)payload);
94 * Calls shutdown() on each socket and closes it. This function to be called
95 * when exiting or restarting only!
98 void ipc_shutdown(void) {
100 while (!TAILQ_EMPTY(&all_clients)) {
101 current = TAILQ_FIRST(&all_clients);
102 shutdown(current->fd, SHUT_RDWR);
104 TAILQ_REMOVE(&all_clients, current, clients);
110 * Executes the command and returns whether it could be successfully parsed
111 * or not (at the moment, always returns true).
114 IPC_HANDLER(command) {
115 /* To get a properly terminated buffer, we copy
116 * message_size bytes out of the buffer */
117 char *command = scalloc(message_size + 1);
118 strncpy(command, (const char*)message, message_size);
119 LOG("IPC: received: *%s*\n", command);
120 struct CommandResult *command_output = parse_command((const char*)command);
123 if (command_output->needs_tree_render)
126 const unsigned char *reply;
128 yajl_gen_get_buf(command_output->json_gen, &reply, &length);
130 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_COMMAND,
131 (const uint8_t*)reply);
133 yajl_gen_free(command_output->json_gen);
136 static void dump_rect(yajl_gen gen, const char *name, Rect r) {
146 y(integer, r.height);
150 void dump_node(yajl_gen gen, struct Con *con, bool inplace_restart) {
153 y(integer, (long int)con);
166 case CT_FLOATING_CON:
167 ystr("floating_con");
176 DLOG("About to dump unknown container type=%d. This is a bug.\n", con->type);
181 /* provided for backwards compatibility only. */
183 if (!con_is_split(con))
186 if (con_orientation(con) == HORIZ)
188 else ystr("vertical");
191 ystr("scratchpad_state");
192 switch (con->scratchpad_state) {
193 case SCRATCHPAD_NONE:
196 case SCRATCHPAD_FRESH:
199 case SCRATCHPAD_CHANGED:
205 if (con->percent == 0.0)
207 else y(double, con->percent);
210 y(bool, con->urgent);
212 if (con->mark != NULL) {
218 y(bool, (con == focused));
221 switch (con->layout) {
223 DLOG("About to dump layout=default, this is a bug in the code.\n");
246 ystr("workspace_layout");
247 switch (con->workspace_layout) {
258 DLOG("About to dump workspace_layout=%d (none of default/stacked/tabbed), this is a bug.\n", con->workspace_layout);
263 ystr("last_split_layout");
264 switch (con->layout) {
274 switch (con->border_style) {
286 ystr("current_border_width");
287 y(integer, con->current_border_width);
289 dump_rect(gen, "rect", con->rect);
290 dump_rect(gen, "window_rect", con->window_rect);
291 dump_rect(gen, "geometry", con->geometry);
294 if (con->window && con->window->name)
295 ystr(i3string_as_utf8(con->window->name));
299 if (con->type == CT_WORKSPACE) {
301 y(integer, con->num);
306 y(integer, con->window->id);
309 if (con->window && !inplace_restart) {
310 /* Window properties are useless to preserve when restarting because
311 * they will be queried again anyway. However, for i3-save-tree(1),
312 * they are very useful and save i3-save-tree dealing with X11. */
313 ystr("window_properties");
316 #define DUMP_PROPERTY(key, prop_name) do { \
317 if (con->window->prop_name != NULL) { \
319 ystr(con->window->prop_name); \
323 DUMP_PROPERTY("class", class_class);
324 DUMP_PROPERTY("instance", class_instance);
325 DUMP_PROPERTY("window_role", role);
327 if (con->window->name != NULL) {
329 ystr(i3string_as_utf8(con->window->name));
338 if (con->type != CT_DOCKAREA || !inplace_restart) {
339 TAILQ_FOREACH(node, &(con->nodes_head), nodes) {
340 dump_node(gen, node, inplace_restart);
345 ystr("floating_nodes");
347 TAILQ_FOREACH(node, &(con->floating_head), floating_windows) {
348 dump_node(gen, node, inplace_restart);
354 TAILQ_FOREACH(node, &(con->focus_head), focused) {
355 y(integer, (long int)node);
359 ystr("fullscreen_mode");
360 y(integer, con->fullscreen_mode);
363 switch (con->floating) {
364 case FLOATING_AUTO_OFF:
367 case FLOATING_AUTO_ON:
370 case FLOATING_USER_OFF:
373 case FLOATING_USER_ON:
381 TAILQ_FOREACH(match, &(con->swallow_head), matches) {
383 if (match->dock != -1) {
385 y(integer, match->dock);
386 ystr("insert_where");
387 y(integer, match->insert_where);
390 #define DUMP_REGEX(re_name) do { \
391 if (match->re_name != NULL) { \
393 ystr(match->re_name->pattern); \
398 DUMP_REGEX(instance);
399 DUMP_REGEX(window_role);
406 if (inplace_restart) {
407 if (con->window != NULL) {
410 y(integer, con->window->id);
411 ystr("restart_mode");
418 if (inplace_restart && con->window != NULL) {
420 y(integer, con->depth);
426 static void dump_bar_config(yajl_gen gen, Barconfig *config) {
432 if (config->num_outputs > 0) {
435 for (int c = 0; c < config->num_outputs; c++)
436 ystr(config->outputs[c]);
440 #define YSTR_IF_SET(name) \
442 if (config->name) { \
444 ystr(config->name); \
448 YSTR_IF_SET(tray_output);
449 YSTR_IF_SET(socket_path);
452 switch (config->mode) {
465 ystr("hidden_state");
466 switch (config->hidden_state) {
477 switch (config->modifier) {
507 if (config->position == P_BOTTOM)
511 YSTR_IF_SET(status_command);
514 ystr("workspace_buttons");
515 y(bool, !config->hide_workspace_buttons);
517 ystr("binding_mode_indicator");
518 y(bool, !config->hide_binding_mode_indicator);
521 y(bool, config->verbose);
524 #define YSTR_IF_SET(name) \
526 if (config->colors.name) { \
528 ystr(config->colors.name); \
534 YSTR_IF_SET(background);
535 YSTR_IF_SET(statusline);
536 YSTR_IF_SET(separator);
537 YSTR_IF_SET(focused_workspace_border);
538 YSTR_IF_SET(focused_workspace_bg);
539 YSTR_IF_SET(focused_workspace_text);
540 YSTR_IF_SET(active_workspace_border);
541 YSTR_IF_SET(active_workspace_bg);
542 YSTR_IF_SET(active_workspace_text);
543 YSTR_IF_SET(inactive_workspace_border);
544 YSTR_IF_SET(inactive_workspace_bg);
545 YSTR_IF_SET(inactive_workspace_text);
546 YSTR_IF_SET(urgent_workspace_border);
547 YSTR_IF_SET(urgent_workspace_bg);
548 YSTR_IF_SET(urgent_workspace_text);
556 setlocale(LC_NUMERIC, "C");
557 yajl_gen gen = ygenalloc();
558 dump_node(gen, croot, false);
559 setlocale(LC_NUMERIC, "");
561 const unsigned char *payload;
563 y(get_buf, &payload, &length);
565 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_TREE, payload);
571 * Formats the reply message for a GET_WORKSPACES request and sends it to the
575 IPC_HANDLER(get_workspaces) {
576 yajl_gen gen = ygenalloc();
579 Con *focused_ws = con_get_workspace(focused);
582 TAILQ_FOREACH(output, &(croot->nodes_head), nodes) {
583 if (con_is_internal(output))
586 TAILQ_FOREACH(ws, &(output_get_content(output)->nodes_head), nodes) {
587 assert(ws->type == CT_WORKSPACE);
593 else y(integer, ws->num);
599 y(bool, workspace_is_visible(ws));
602 y(bool, ws == focused_ws);
607 y(integer, ws->rect.x);
609 y(integer, ws->rect.y);
611 y(integer, ws->rect.width);
613 y(integer, ws->rect.height);
628 const unsigned char *payload;
630 y(get_buf, &payload, &length);
632 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_WORKSPACES, payload);
637 * Formats the reply message for a GET_OUTPUTS request and sends it to the
641 IPC_HANDLER(get_outputs) {
642 yajl_gen gen = ygenalloc();
646 TAILQ_FOREACH(output, &outputs, outputs) {
653 y(bool, output->active);
656 y(bool, output->primary);
661 y(integer, output->rect.x);
663 y(integer, output->rect.y);
665 y(integer, output->rect.width);
667 y(integer, output->rect.height);
670 ystr("current_workspace");
672 if (output->con && (ws = con_get_fullscreen_con(output->con, CF_OUTPUT)))
681 const unsigned char *payload;
683 y(get_buf, &payload, &length);
685 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_OUTPUTS, payload);
690 * Formats the reply message for a GET_MARKS request and sends it to the
694 IPC_HANDLER(get_marks) {
695 yajl_gen gen = ygenalloc();
699 TAILQ_FOREACH(con, &all_cons, all_cons)
700 if (con->mark != NULL)
705 const unsigned char *payload;
707 y(get_buf, &payload, &length);
709 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_MARKS, payload);
714 * Returns the version of i3
717 IPC_HANDLER(get_version) {
718 yajl_gen gen = ygenalloc();
722 y(integer, MAJOR_VERSION);
725 y(integer, MINOR_VERSION);
728 y(integer, PATCH_VERSION);
730 ystr("human_readable");
735 const unsigned char *payload;
737 y(get_buf, &payload, &length);
739 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_VERSION, payload);
744 * Formats the reply message for a GET_BAR_CONFIG request and sends it to the
748 IPC_HANDLER(get_bar_config) {
749 yajl_gen gen = ygenalloc();
751 /* If no ID was passed, we return a JSON array with all IDs */
752 if (message_size == 0) {
755 TAILQ_FOREACH(current, &barconfigs, configs) {
760 const unsigned char *payload;
762 y(get_buf, &payload, &length);
764 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_BAR_CONFIG, payload);
769 /* To get a properly terminated buffer, we copy
770 * message_size bytes out of the buffer */
771 char *bar_id = scalloc(message_size + 1);
772 strncpy(bar_id, (const char*)message, message_size);
773 LOG("IPC: looking for config for bar ID \"%s\"\n", bar_id);
774 Barconfig *current, *config = NULL;
775 TAILQ_FOREACH(current, &barconfigs, configs) {
776 if (strcmp(current->id, bar_id) != 0)
784 /* If we did not find a config for the given ID, the reply will contain
785 * a null 'id' field. */
793 dump_bar_config(gen, config);
796 const unsigned char *payload;
798 y(get_buf, &payload, &length);
800 ipc_send_message(fd, length, I3_IPC_REPLY_TYPE_BAR_CONFIG, payload);
805 * Callback for the YAJL parser (will be called when a string is parsed).
808 static int add_subscription(void *extra, const unsigned char *s,
810 ipc_client *client = extra;
812 DLOG("should add subscription to extra %p, sub %.*s\n", client, (int)len, s);
813 int event = client->num_events;
815 client->num_events++;
816 client->events = realloc(client->events, client->num_events * sizeof(char*));
817 /* We copy the string because it is not null-terminated and strndup()
818 * is missing on some BSD systems */
819 client->events[event] = scalloc(len+1);
820 memcpy(client->events[event], s, len);
822 DLOG("client is now subscribed to:\n");
823 for (int i = 0; i < client->num_events; i++)
824 DLOG("event %s\n", client->events[i]);
831 * Subscribes this connection to the event types which were given as a JSON
832 * serialized array in the payload field of the message.
835 IPC_HANDLER(subscribe) {
838 ipc_client *current, *client = NULL;
840 /* Search the ipc_client structure for this connection */
841 TAILQ_FOREACH(current, &all_clients, clients) {
842 if (current->fd != fd)
849 if (client == NULL) {
850 ELOG("Could not find ipc_client data structure for fd %d\n", fd);
854 /* Setup the JSON parser */
855 static yajl_callbacks callbacks = {
856 .yajl_string = add_subscription,
859 p = yalloc(&callbacks, (void*)client);
860 stat = yajl_parse(p, (const unsigned char*)message, message_size);
861 if (stat != yajl_status_ok) {
863 err = yajl_get_error(p, true, (const unsigned char*)message,
865 ELOG("YAJL parse error: %s\n", err);
866 yajl_free_error(p, err);
868 const char *reply = "{\"success\":false}";
869 ipc_send_message(fd, strlen(reply), I3_IPC_REPLY_TYPE_SUBSCRIBE, (const uint8_t*)reply);
874 const char *reply = "{\"success\":true}";
875 ipc_send_message(fd, strlen(reply), I3_IPC_REPLY_TYPE_SUBSCRIBE, (const uint8_t*)reply);
878 /* The index of each callback function corresponds to the numeric
879 * value of the message type (see include/i3/ipc.h) */
880 handler_t handlers[8] = {
882 handle_get_workspaces,
887 handle_get_bar_config,
892 * Handler for activity on a client connection, receives a message from a
895 * For now, the maximum message size is 2048. I’m not sure for what the
896 * IPC interface will be used in the future, thus I’m not implementing a
897 * mechanism for arbitrarily long messages, as it seems like overkill
901 static void ipc_receive_message(EV_P_ struct ev_io *w, int revents) {
902 uint32_t message_type;
903 uint32_t message_length;
904 uint8_t *message = NULL;
906 int ret = ipc_recv_message(w->fd, &message_type, &message_length, &message);
907 /* EOF or other error */
909 /* Was this a spurious read? See ev(3) */
910 if (ret == -1 && errno == EAGAIN) {
915 /* If not, there was some kind of error. We don’t bother
916 * and close the connection */
919 /* Delete the client from the list of clients */
921 TAILQ_FOREACH(current, &all_clients, clients) {
922 if (current->fd != w->fd)
925 for (int i = 0; i < current->num_events; i++)
926 free(current->events[i]);
927 /* We can call TAILQ_REMOVE because we break out of the
928 * TAILQ_FOREACH afterwards */
929 TAILQ_REMOVE(&all_clients, current, clients);
938 DLOG("IPC: client disconnected\n");
942 if (message_type >= (sizeof(handlers) / sizeof(handler_t)))
943 DLOG("Unhandled message type: %d\n", message_type);
945 handler_t h = handlers[message_type];
946 h(w->fd, message, 0, message_length, message_type);
953 * Handler for activity on the listening socket, meaning that a new client
954 * has just connected and we should accept() him. Sets up the event handler
955 * for activity on the new connection and inserts the file descriptor into
956 * the list of clients.
959 void ipc_new_client(EV_P_ struct ev_io *w, int revents) {
960 struct sockaddr_un peer;
961 socklen_t len = sizeof(struct sockaddr_un);
963 if ((client = accept(w->fd, (struct sockaddr*)&peer, &len)) < 0) {
966 else perror("accept()");
970 /* Close this file descriptor on exec() */
971 (void)fcntl(client, F_SETFD, FD_CLOEXEC);
973 set_nonblock(client);
975 struct ev_io *package = scalloc(sizeof(struct ev_io));
976 ev_io_init(package, ipc_receive_message, client, EV_READ);
977 ev_io_start(EV_A_ package);
979 DLOG("IPC: new client connected on fd %d\n", w->fd);
981 ipc_client *new = scalloc(sizeof(ipc_client));
984 TAILQ_INSERT_TAIL(&all_clients, new, clients);
988 * Creates the UNIX domain socket at the given path, sets it to non-blocking
989 * mode, bind()s and listen()s on it.
992 int ipc_create_socket(const char *filename) {
995 FREE(current_socketpath);
997 char *resolved = resolve_tilde(filename);
998 DLOG("Creating IPC-socket at %s\n", resolved);
999 char *copy = sstrdup(resolved);
1000 const char *dir = dirname(copy);
1001 if (!path_exists(dir))
1005 /* Unlink the unix domain socket before */
1008 if ((sockfd = socket(AF_LOCAL, SOCK_STREAM, 0)) < 0) {
1014 (void)fcntl(sockfd, F_SETFD, FD_CLOEXEC);
1016 struct sockaddr_un addr;
1017 memset(&addr, 0, sizeof(struct sockaddr_un));
1018 addr.sun_family = AF_LOCAL;
1019 strncpy(addr.sun_path, resolved, sizeof(addr.sun_path) - 1);
1020 if (bind(sockfd, (struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0) {
1026 set_nonblock(sockfd);
1028 if (listen(sockfd, 5) < 0) {
1034 current_socketpath = resolved;
1039 * For the workspace "focus" event we send, along the usual "change" field,
1040 * also the current and previous workspace, in "current" and "old"
1043 void ipc_send_workspace_focus_event(Con *current, Con *old) {
1044 setlocale(LC_NUMERIC, "C");
1045 yajl_gen gen = ygenalloc();
1053 dump_node(gen, current, false);
1059 dump_node(gen, old, false);
1063 const unsigned char *payload;
1065 y(get_buf, &payload, &length);
1067 ipc_send_event("workspace", I3_IPC_EVENT_WORKSPACE, (const char *)payload);
1069 setlocale(LC_NUMERIC, "");
1073 * For the window events we send, along the usual "change" field,
1074 * also the window container, in "container".
1076 void ipc_send_window_event(const char *property, Con *con) {
1077 DLOG("Issue IPC window %s event (con = %p, window = 0x%08x)\n",
1078 property, con, (con->window ? con->window->id : XCB_WINDOW_NONE));
1080 setlocale(LC_NUMERIC, "C");
1081 yajl_gen gen = ygenalloc();
1089 dump_node(gen, con, false);
1093 const unsigned char *payload;
1095 y(get_buf, &payload, &length);
1097 ipc_send_event("window", I3_IPC_EVENT_WINDOW, (const char *)payload);
1099 setlocale(LC_NUMERIC, "");
1103 * For the barconfig update events, we send the serialized barconfig.
1105 void ipc_send_barconfig_update_event(Barconfig *barconfig) {
1106 DLOG("Issue barconfig_update event for id = %s\n", barconfig->id);
1107 setlocale(LC_NUMERIC, "C");
1108 yajl_gen gen = ygenalloc();
1110 dump_bar_config(gen, barconfig);
1112 const unsigned char *payload;
1114 y(get_buf, &payload, &length);
1116 ipc_send_event("barconfig_update", I3_IPC_EVENT_BARCONFIG_UPDATE, (const char *)payload);
1118 setlocale(LC_NUMERIC, "");