sway/sway/ipc.c
2015-11-13 14:07:18 +01:00

467 lines
15 KiB
C

// See https://i3wm.org/docs/ipc.html for protocol information
#include <errno.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdbool.h>
#include <wlc/wlc.h>
#include <unistd.h>
#include <stdlib.h>
#include <sys/ioctl.h>
#include <fcntl.h>
#include <ctype.h>
#include <json-c/json.h>
#include <list.h>
#include "ipc.h"
#include "log.h"
#include "config.h"
#include "commands.h"
#include "list.h"
#include "stringop.h"
static int ipc_socket = -1;
static struct wlc_event_source *ipc_event_source = NULL;
static struct sockaddr_un *ipc_sockaddr = NULL;
static list_t *ipc_client_list = NULL;
static const char ipc_magic[] = {'i', '3', '-', 'i', 'p', 'c'};
struct ipc_client {
struct wlc_event_source *event_source;
int fd;
uint32_t payload_length;
enum ipc_command_type current_command;
enum ipc_command_type subscribed_events;
};
struct sockaddr_un *ipc_user_sockaddr(void);
int ipc_handle_connection(int fd, uint32_t mask, void *data);
int ipc_client_handle_readable(int client_fd, uint32_t mask, void *data);
void ipc_client_disconnect(struct ipc_client *client);
void ipc_client_handle_command(struct ipc_client *client);
bool ipc_send_reply(struct ipc_client *client, const char *payload, uint32_t payload_length);
void ipc_get_workspaces_callback(swayc_t *workspace, void *data);
void ipc_get_outputs_callback(swayc_t *container, void *data);
void ipc_init(void) {
ipc_socket = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
if (ipc_socket == -1) {
sway_abort("Unable to create IPC socket");
}
ipc_sockaddr = ipc_user_sockaddr();
if (getenv("SWAYSOCK") != NULL) {
strncpy(ipc_sockaddr->sun_path, getenv("SWAYSOCK"), sizeof(ipc_sockaddr->sun_path));
}
unlink(ipc_sockaddr->sun_path);
if (bind(ipc_socket, (struct sockaddr *)ipc_sockaddr, sizeof(*ipc_sockaddr)) == -1) {
sway_abort("Unable to bind IPC socket");
}
if (listen(ipc_socket, 3) == -1) {
sway_abort("Unable to listen on IPC socket");
}
// Set i3 IPC socket path so that i3-msg works out of the box
setenv("I3SOCK", ipc_sockaddr->sun_path, 1);
ipc_client_list = create_list();
ipc_event_source = wlc_event_loop_add_fd(ipc_socket, WLC_EVENT_READABLE, ipc_handle_connection, NULL);
}
void ipc_terminate(void) {
if (ipc_event_source) {
wlc_event_source_remove(ipc_event_source);
}
close(ipc_socket);
unlink(ipc_sockaddr->sun_path);
list_free(ipc_client_list);
if (ipc_sockaddr) {
free(ipc_sockaddr);
}
}
struct sockaddr_un *ipc_user_sockaddr(void) {
struct sockaddr_un *ipc_sockaddr = malloc(sizeof(struct sockaddr_un));
if (ipc_sockaddr == NULL) {
sway_abort("can't malloc ipc_sockaddr");
}
ipc_sockaddr->sun_family = AF_UNIX;
int path_size = sizeof(ipc_sockaddr->sun_path);
// Env var typically set by logind, e.g. "/run/user/<user-id>"
const char *dir = getenv("XDG_RUNTIME_DIR");
if (!dir) {
dir = "/tmp";
}
if (path_size <= snprintf(ipc_sockaddr->sun_path, path_size,
"%s/sway-ipc.%i.%i.sock", dir, getuid(), getpid())) {
sway_abort("socket path won't fit into ipc_sockaddr->sun_path");
}
return ipc_sockaddr;
}
int ipc_handle_connection(int fd, uint32_t mask, void *data) {
(void) fd; (void) data;
sway_log(L_DEBUG, "Event on IPC listening socket");
assert(mask == WLC_EVENT_READABLE);
int client_fd = accept(ipc_socket, NULL, NULL);
if (client_fd == -1) {
sway_log_errno(L_INFO, "Unable to accept IPC client connection");
return 0;
}
int flags;
if ((flags=fcntl(client_fd, F_GETFD)) == -1 || fcntl(client_fd, F_SETFD, flags|FD_CLOEXEC) == -1) {
sway_log_errno(L_INFO, "Unable to set CLOEXEC on IPC client socket");
return 0;
}
struct ipc_client* client = malloc(sizeof(struct ipc_client));
client->payload_length = 0;
client->fd = client_fd;
client->event_source = wlc_event_loop_add_fd(client_fd, WLC_EVENT_READABLE, ipc_client_handle_readable, client);
list_add(ipc_client_list, client);
return 0;
}
static const int ipc_header_size = sizeof(ipc_magic)+8;
int ipc_client_handle_readable(int client_fd, uint32_t mask, void *data) {
struct ipc_client *client = data;
if (mask & WLC_EVENT_ERROR) {
sway_log(L_INFO, "IPC Client socket error, removing client");
client->fd = -1;
ipc_client_disconnect(client);
return 0;
}
if (mask & WLC_EVENT_HANGUP) {
client->fd = -1;
ipc_client_disconnect(client);
return 0;
}
int read_available;
if (ioctl(client_fd, FIONREAD, &read_available) == -1) {
sway_log_errno(L_INFO, "Unable to read IPC socket buffer size");
ipc_client_disconnect(client);
return 0;
}
// Wait for the rest of the command payload in case the header has already been read
if (client->payload_length > 0) {
if ((uint32_t)read_available >= client->payload_length) {
ipc_client_handle_command(client);
}
return 0;
}
if (read_available < ipc_header_size) {
return 0;
}
uint8_t buf[ipc_header_size];
uint32_t *buf32 = (uint32_t*)(buf + sizeof(ipc_magic));
ssize_t received = recv(client_fd, buf, ipc_header_size, 0);
if (received == -1) {
sway_log_errno(L_INFO, "Unable to receive header from IPC client");
ipc_client_disconnect(client);
return 0;
}
if (memcmp(buf, ipc_magic, sizeof(ipc_magic)) != 0) {
sway_log(L_DEBUG, "IPC header check failed");
ipc_client_disconnect(client);
return 0;
}
client->payload_length = buf32[0];
client->current_command = (enum ipc_command_type)buf32[1];
if (read_available - received >= client->payload_length) {
ipc_client_handle_command(client);
}
return 0;
}
void ipc_client_disconnect(struct ipc_client *client)
{
if (!sway_assert(client != NULL, "client != NULL")) {
return;
}
if (client->fd != -1) {
shutdown(client->fd, SHUT_RDWR);
}
sway_log(L_INFO, "IPC Client %d disconnected", client->fd);
wlc_event_source_remove(client->event_source);
int i = 0;
while (i < ipc_client_list->length && ipc_client_list->items[i] != client) i++;
list_del(ipc_client_list, i);
close(client->fd);
free(client);
}
bool output_by_name_test(swayc_t *view, void *data) {
char *name = (char *)data;
if (view->type != C_OUTPUT) {
return false;
}
return !strcmp(name, view->name);
}
bool get_pixels_callback(const struct wlc_size *size, uint8_t *rgba, void *arg) {
struct ipc_client *client = (struct ipc_client *)arg;
char response_header[9];
memset(response_header, 0, sizeof(response_header));
response_header[0] = 1;
uint32_t *_size = (uint32_t *)(response_header + 1);
_size[0] = size->w;
_size[1] = size->h;
size_t len = sizeof(response_header) + (size->w * size->h * 4);
char *payload = malloc(len);
memcpy(payload, response_header, sizeof(response_header));
memcpy(payload + sizeof(response_header), rgba, len - sizeof(response_header));
ipc_send_reply(client, payload, len);
free(payload);
return false;
}
void ipc_client_handle_command(struct ipc_client *client) {
if (!sway_assert(client != NULL, "client != NULL")) {
return;
}
char *buf = malloc(client->payload_length + 1);
if (client->payload_length > 0)
{
ssize_t received = recv(client->fd, buf, client->payload_length, 0);
if (received == -1)
{
sway_log_errno(L_INFO, "Unable to receive payload from IPC client");
ipc_client_disconnect(client);
free(buf);
return;
}
}
switch (client->current_command) {
case IPC_COMMAND:
{
buf[client->payload_length] = '\0';
struct cmd_results *results = handle_command(buf);
const char *json = cmd_results_to_json(results);
char reply[256];
int length = snprintf(reply, sizeof(reply), "%s", json);
ipc_send_reply(client, reply, (uint32_t) length);
free_cmd_results(results);
break;
}
case IPC_SUBSCRIBE:
{
buf[client->payload_length] = '\0';
struct json_object *request = json_tokener_parse(buf);
if (request == NULL) {
ipc_send_reply(client, "{\"success\": false}", 18);
ipc_client_disconnect(client);
free(buf);
return;
}
// parse requested event types
for (int i = 0; i < json_object_array_length(request); i++) {
const char *event_type = json_object_get_string(json_object_array_get_idx(request, i));
if (strcmp(event_type, "workspace") == 0) {
client->subscribed_events |= IPC_GET_WORKSPACES;
}
else {
ipc_send_reply(client, "{\"success\": false}", 18);
ipc_client_disconnect(client);
json_object_put(request);
free(buf);
return;
}
}
json_object_put(request);
ipc_send_reply(client, "{\"success\": true}", 17);
break;
}
case IPC_GET_WORKSPACES:
{
json_object *workspaces = json_object_new_array();
container_map(&root_container, ipc_get_workspaces_callback, workspaces);
const char *json_string = json_object_to_json_string(workspaces);
ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
json_object_put(workspaces); // free
break;
}
case IPC_GET_OUTPUTS:
{
json_object *outputs = json_object_new_array();
container_map(&root_container, ipc_get_outputs_callback, outputs);
const char *json_string = json_object_to_json_string(outputs);
ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
json_object_put(outputs); // free
break;
}
case IPC_GET_VERSION:
{
#if defined SWAY_GIT_VERSION && defined SWAY_GIT_BRANCH && defined SWAY_VERSION_DATE
char *full_version = calloc(strlen(SWAY_GIT_VERSION) + strlen(SWAY_GIT_BRANCH) + strlen(SWAY_VERSION_DATE) + 20, 1);
strcat(full_version, SWAY_GIT_VERSION);
strcat(full_version, " (");
strcat(full_version, SWAY_VERSION_DATE);
strcat(full_version, ", branch \"");
strcat(full_version, SWAY_GIT_BRANCH);
strcat(full_version, "\")");
json_object *json = json_object_new_object();
json_object_object_add(json, "human_readable", json_object_new_string(full_version));
// Todo once we actually release a version
json_object_object_add(json, "major", json_object_new_int(0));
json_object_object_add(json, "minor", json_object_new_int(0));
json_object_object_add(json, "patch", json_object_new_int(1));
#else
json_object_object_add(json, "human_readable", json_object_new_string("version not found"));
json_object_object_add(json, "major", json_object_new_int(0));
json_object_object_add(json, "minor", json_object_new_int(0));
json_object_object_add(json, "patch", json_object_new_int(0));
#endif
const char *json_string = json_object_to_json_string(json);
ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
json_object_put(json); // free
free(full_version);
break;
}
case IPC_SWAY_GET_PIXELS:
{
char response_header[9];
memset(response_header, 0, sizeof(response_header));
buf[client->payload_length] = '\0';
swayc_t *output = swayc_by_test(&root_container, output_by_name_test, buf);
if (!output) {
sway_log(L_ERROR, "IPC GET_PIXELS request with unknown output name");
ipc_send_reply(client, response_header, sizeof(response_header));
break;
}
wlc_output_get_pixels(output->handle, get_pixels_callback, client);
break;
}
default:
sway_log(L_INFO, "Unknown IPC command type %i", client->current_command);
ipc_client_disconnect(client);
return;
}
client->payload_length = 0;
free(buf);
}
bool ipc_send_reply(struct ipc_client *client, const char *payload, uint32_t payload_length) {
assert(payload);
char data[ipc_header_size];
uint32_t *data32 = (uint32_t*)(data + sizeof(ipc_magic));
memcpy(data, ipc_magic, sizeof(ipc_magic));
data32[0] = payload_length;
data32[1] = client->current_command;
if (write(client->fd, data, ipc_header_size) == -1) {
sway_log_errno(L_INFO, "Unable to send header to IPC client");
ipc_client_disconnect(client);
return false;
}
if (write(client->fd, payload, payload_length) == -1) {
sway_log_errno(L_INFO, "Unable to send payload to IPC client");
ipc_client_disconnect(client);
return false;
}
return true;
}
json_object *ipc_json_describe_workspace(swayc_t *workspace) {
int num = isdigit(workspace->name[0]) ? atoi(workspace->name) : -1;
json_object *object = json_object_new_object();
json_object *rect = json_object_new_object();
json_object_object_add(rect, "x", json_object_new_int((int32_t) workspace->x));
json_object_object_add(rect, "y", json_object_new_int((int32_t) workspace->y));
json_object_object_add(rect, "width", json_object_new_int((int32_t) workspace->width));
json_object_object_add(rect, "height", json_object_new_int((int32_t) workspace->height));
json_object_object_add(object, "num", json_object_new_int(num));
json_object_object_add(object, "name", json_object_new_string(workspace->name));
json_object_object_add(object, "visible", json_object_new_boolean(workspace->visible));
bool focused = root_container.focused == workspace->parent && workspace->parent->focused == workspace;
json_object_object_add(object, "focused", json_object_new_boolean(focused));
json_object_object_add(object, "rect", rect);
json_object_object_add(object, "output", json_object_new_string(workspace->parent ? workspace->parent->name : "null"));
json_object_object_add(object, "urgent", json_object_new_boolean(false));
return object;
}
void ipc_get_workspaces_callback(swayc_t *workspace, void *data) {
if (workspace->type == C_WORKSPACE) {
json_object_array_add((json_object *)data, ipc_json_describe_workspace(workspace));
}
}
json_object *ipc_json_describe_output(swayc_t *output) {
json_object *object = json_object_new_object();
json_object *rect = json_object_new_object();
json_object_object_add(rect, "x", json_object_new_int((int32_t) output->x));
json_object_object_add(rect, "y", json_object_new_int((int32_t) output->y));
json_object_object_add(rect, "width", json_object_new_int((int32_t) output->width));
json_object_object_add(rect, "height", json_object_new_int((int32_t) output->height));
json_object_object_add(object, "name", json_object_new_string(output->name));
json_object_object_add(object, "active", json_object_new_boolean(true));
json_object_object_add(object, "primary", json_object_new_boolean(false));
json_object_object_add(object, "rect", rect);
json_object_object_add(object, "current_workspace",
output->focused ? json_object_new_string(output->focused->name) : NULL);
return object;
}
void ipc_get_outputs_callback(swayc_t *container, void *data) {
if (container->type == C_OUTPUT) {
json_object_array_add((json_object *)data, ipc_json_describe_output(container));
}
}
void ipc_event_workspace(swayc_t *old, swayc_t *new) {
json_object *obj = json_object_new_object();
json_object_object_add(obj, "change", json_object_new_string("focus"));
json_object_object_add(obj, "old", ipc_json_describe_workspace(old));
json_object_object_add(obj, "current", ipc_json_describe_workspace(new));
const char *json_string = json_object_to_json_string(obj);
for (int i = 0; i < ipc_client_list->length; i++) {
struct ipc_client *client = ipc_client_list->items[i];
if ((client->subscribed_events & IPC_GET_WORKSPACES) == 0) break;
ipc_send_reply(client, json_string, (uint32_t) strlen(json_string));
}
json_object_put(obj); // free
}