/* * vim:ts=8:expandtab * * i3 - an improved dynamic tiling window manager * * © 2009-2010 Michael Stapelberg and contributors * * See file LICENSE for license information. * * i3-msg/main.c: Utility which sends messages to a running i3-instance using * IPC via UNIX domain sockets. * * This serves as an example for how to send your own messages to i3. * Additionally, it’s even useful sometimes :-). * */ #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include static char *socket_path; /* * Try to get the socket path from X11 and return NULL if it doesn’t work. * As i3-msg is a short-running tool, we don’t bother with cleaning up the * connection and leave it up to the operating system on exit. * */ static char *socket_path_from_x11() { xcb_connection_t *conn; int screen; if ((conn = xcb_connect(NULL, &screen)) == NULL || xcb_connection_has_error(conn)) return NULL; xcb_screen_t *root_screen = xcb_aux_get_screen(conn, screen); xcb_window_t root = root_screen->root; xcb_intern_atom_cookie_t atom_cookie; xcb_intern_atom_reply_t *atom_reply; atom_cookie = xcb_intern_atom(conn, 0, strlen("I3_SOCKET_PATH"), "I3_SOCKET_PATH"); atom_reply = xcb_intern_atom_reply(conn, atom_cookie, NULL); if (atom_reply == NULL) return NULL; xcb_get_property_cookie_t prop_cookie; xcb_get_property_reply_t *prop_reply; prop_cookie = xcb_get_property_unchecked(conn, false, root, atom_reply->atom, XCB_GET_PROPERTY_TYPE_ANY, 0, PATH_MAX); prop_reply = xcb_get_property_reply(conn, prop_cookie, NULL); if (prop_reply == NULL || xcb_get_property_value_length(prop_reply) == 0) return NULL; if (asprintf(&socket_path, "%.*s", xcb_get_property_value_length(prop_reply), (char*)xcb_get_property_value(prop_reply)) == -1) return NULL; return socket_path; } /* * Formats a message (payload) of the given size and type and sends it to i3 via * the given socket file descriptor. * */ static void ipc_send_message(int sockfd, uint32_t message_size, uint32_t message_type, uint8_t *payload) { int buffer_size = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t) + message_size; char msg[buffer_size]; char *walk = msg; strcpy(walk, I3_IPC_MAGIC); walk += strlen(I3_IPC_MAGIC); memcpy(walk, &message_size, sizeof(uint32_t)); walk += sizeof(uint32_t); memcpy(walk, &message_type, sizeof(uint32_t)); walk += sizeof(uint32_t); memcpy(walk, payload, message_size); int sent_bytes = 0; int bytes_to_go = buffer_size; while (sent_bytes < bytes_to_go) { int n = write(sockfd, msg + sent_bytes, bytes_to_go); if (n == -1) err(EXIT_FAILURE, "write() failed"); sent_bytes += n; bytes_to_go -= n; } } static void ipc_recv_message(int sockfd, uint32_t message_type, uint32_t *reply_length, uint8_t **reply) { /* Read the message header first */ uint32_t to_read = strlen(I3_IPC_MAGIC) + sizeof(uint32_t) + sizeof(uint32_t); char msg[to_read]; char *walk = msg; uint32_t read_bytes = 0; while (read_bytes < to_read) { int n = read(sockfd, msg + read_bytes, to_read); if (n == -1) err(EXIT_FAILURE, "read() failed"); if (n == 0) errx(EXIT_FAILURE, "received EOF instead of reply"); read_bytes += n; to_read -= n; } if (memcmp(walk, I3_IPC_MAGIC, strlen(I3_IPC_MAGIC)) != 0) errx(EXIT_FAILURE, "invalid magic in reply"); walk += strlen(I3_IPC_MAGIC); *reply_length = *((uint32_t*)walk); walk += sizeof(uint32_t); if (*((uint32_t*)walk) != message_type) errx(EXIT_FAILURE, "unexpected reply type (got %d, expected %d)", *((uint32_t*)walk), message_type); walk += sizeof(uint32_t); *reply = malloc(*reply_length); if ((*reply) == NULL) err(EXIT_FAILURE, "malloc() failed"); to_read = *reply_length; read_bytes = 0; while (read_bytes < to_read) { int n = read(sockfd, *reply + read_bytes, to_read); if (n == -1) err(EXIT_FAILURE, "read() failed"); read_bytes += n; to_read -= n; } } int main(int argc, char *argv[]) { socket_path = getenv("I3SOCK"); int o, option_index = 0; int message_type = I3_IPC_MESSAGE_TYPE_COMMAND; char *payload = ""; bool quiet = false; static struct option long_options[] = { {"socket", required_argument, 0, 's'}, {"type", required_argument, 0, 't'}, {"version", no_argument, 0, 'v'}, {"quiet", no_argument, 0, 'q'}, {"help", no_argument, 0, 'h'}, {0, 0, 0, 0} }; char *options_string = "s:t:vhq"; while ((o = getopt_long(argc, argv, options_string, long_options, &option_index)) != -1) { if (o == 's') { if (socket_path != NULL) free(socket_path); socket_path = strdup(optarg); } else if (o == 't') { if (strcasecmp(optarg, "command") == 0) message_type = I3_IPC_MESSAGE_TYPE_COMMAND; else if (strcasecmp(optarg, "get_workspaces") == 0) message_type = I3_IPC_MESSAGE_TYPE_GET_WORKSPACES; else if (strcasecmp(optarg, "get_outputs") == 0) message_type = I3_IPC_MESSAGE_TYPE_GET_OUTPUTS; else if (strcasecmp(optarg, "get_tree") == 0) message_type = I3_IPC_MESSAGE_TYPE_GET_TREE; else { printf("Unknown message type\n"); printf("Known types: command, get_workspaces, get_outputs, get_tree\n"); exit(EXIT_FAILURE); } } else if (o == 'q') { quiet = true; } else if (o == 'v') { printf("i3-msg " I3_VERSION "\n"); return 0; } else if (o == 'h') { printf("i3-msg " I3_VERSION "\n"); printf("i3-msg [-s ] [-t ] \n"); return 0; } } if (socket_path == NULL) socket_path = socket_path_from_x11(); /* Fall back to the default socket path */ if (socket_path == NULL) socket_path = strdup("/tmp/i3-ipc.sock"); if (optind < argc) payload = argv[optind]; int sockfd = socket(AF_LOCAL, SOCK_STREAM, 0); if (sockfd == -1) err(EXIT_FAILURE, "Could not create socket"); struct sockaddr_un addr; memset(&addr, 0, sizeof(struct sockaddr_un)); addr.sun_family = AF_LOCAL; strcpy(addr.sun_path, socket_path); if (connect(sockfd, (const struct sockaddr*)&addr, sizeof(struct sockaddr_un)) < 0) err(EXIT_FAILURE, "Could not connect to i3"); ipc_send_message(sockfd, strlen(payload), message_type, (uint8_t*)payload); if (quiet) return 0; uint32_t reply_length; uint8_t *reply; ipc_recv_message(sockfd, message_type, &reply_length, &reply); printf("%.*s", reply_length, reply); free(reply); close(sockfd); return 0; }