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// 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 "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 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;
};
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_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);
}
struct sockaddr_un *ipc_user_sockaddr(void) {
struct sockaddr_un *ipc_sockaddr = malloc(sizeof(struct sockaddr_un));
assert(ipc_sockaddr != NULL);
ipc_sockaddr->sun_family = AF_UNIX;
int path_size = sizeof(ipc_sockaddr->sun_path);
// Without logind:
assert(snprintf(ipc_sockaddr->sun_path, path_size, "/tmp/sway-ipc.%i.sock", getuid()) < path_size);
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);
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;
sway_log(L_DEBUG, "Event on IPC client socket %d", client_fd);
if (mask & WLC_EVENT_ERROR) {
sway_log(L_INFO, "IPC Client socket error, removing client");
ipc_client_disconnect(client);
return 0;
}
if (mask & WLC_EVENT_HANGUP) {
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);
}
else {
sway_log(L_DEBUG, "Too little data to read payload on IPC Client socket, waiting for more (%d < %d)", read_available, client->payload_length);
}
return 0;
}
if (read_available < ipc_header_size) {
sway_log(L_DEBUG, "Too little data to read header on IPC Client socket, waiting for more (%d < %d)", read_available, ipc_header_size);
return 0;
}
char buf[ipc_header_size];
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 = *(uint32_t *)&buf[sizeof(ipc_magic)];
client->current_command = (enum ipc_command_type) *(uint32_t *)&buf[sizeof(ipc_magic)+4];
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;
}
sway_log(L_INFO, "IPC Client %d disconnected", client->fd);
wlc_event_source_remove(client->event_source);
close(client->fd);
free(client);
}
void ipc_client_handle_command(struct ipc_client *client) {
if (!sway_assert(client != NULL, "client != NULL")) {
return;
}
char buf[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);
return;
}
}
switch (client->current_command) {
case IPC_COMMAND:
{
buf[client->payload_length] = '\0';
bool success = handle_command(buf);
char reply[64];
int length = snprintf(reply, sizeof(reply), "{\"success\":%s}", success ? "true" : "false");
ipc_send_reply(client, reply, (uint32_t) length);
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;
}
default:
sway_log(L_INFO, "Unknown IPC command type %i", client->current_command);
ipc_client_disconnect(client);
return;
}
client->payload_length = 0;
}
bool ipc_send_reply(struct ipc_client *client, const char *payload, uint32_t payload_length) {
assert(payload);
char data[ipc_header_size];
memcpy(data, ipc_magic, sizeof(ipc_magic));
*(uint32_t *)&(data[sizeof(ipc_magic)]) = payload_length;
*(uint32_t *)&(data[sizeof(ipc_magic)+4]) = 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;
}
void ipc_get_workspaces_callback(swayc_t *workspace, void *data) {
if (workspace->type == C_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->name));
json_object_object_add(object, "urgent", json_object_new_boolean(false));
json_object_array_add((json_object *)data, object);
}
}
void ipc_get_outputs_callback(swayc_t *container, void *data) {
if (container->type == C_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) container->x));
json_object_object_add(rect, "y", json_object_new_int((int32_t) container->y));
json_object_object_add(rect, "width", json_object_new_int((int32_t) container->width));
json_object_object_add(rect, "height", json_object_new_int((int32_t) container->height));
json_object_object_add(object, "name", json_object_new_string(container->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", container->focused ? json_object_new_string(container->focused->name) : NULL);
json_object_array_add((json_object *)data, object);
}
}
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