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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 <stropts.h>
#include <sys/ioctl.h>
#include "ipc.h"
#include "log.h"
#include "config.h"
#include "commands.h"
static int ipc_socket = -1;
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;
};
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 init_ipc() {
ipc_socket = socket(AF_UNIX, SOCK_STREAM | SOCK_NONBLOCK | SOCK_CLOEXEC, 0);
if (ipc_socket == -1) {
sway_abort("Unable to create IPC socket");
}
struct sockaddr_un ipc_sockaddr = {
.sun_family = AF_UNIX,
// TODO: use a proper socket path
.sun_path = "/tmp/sway.sock"
};
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");
}
wlc_event_loop_add_fd(ipc_socket, WLC_EVENT_READABLE, ipc_handle_connection, NULL);
}
int ipc_handle_connection(int fd, uint32_t mask, 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;
}
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;
ioctl(client_fd, FIONREAD, &read_available);
// Wait for the rest of the command payload in case the header has already been read
if (client->payload_length > 0) {
if (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(config, buf);
char reply[64];
int length = snprintf(reply, sizeof(reply), "{\"success\":%s}", success ? "true" : "false");
ipc_send_reply(client, reply, (uint32_t) length);
break;
}
default:
sway_log(L_INFO, "Unknown IPC command type %i", client->current_command);
ipc_client_disconnect(client);
break;
}
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;
}
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