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sway.c
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sway.c
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// SPDX-License-Identifier: MIT
// Copyright (C) 2020 Artem Senichev <[email protected]>
#include "sway.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <sys/un.h>
#include <sys/socket.h>
#include <json.h>
/** IPC magic header value */
static const uint8_t ipc_magic[] = { 'i', '3', '-', 'i', 'p', 'c' };
/** IPC message types (used only) */
enum ipc_msg_type {
IPC_COMMAND = 0,
IPC_SUBSCRIBE = 2,
};
/** IPC header */
struct __attribute__((__packed__)) ipc_header {
uint8_t magic[sizeof(ipc_magic)];
uint32_t len;
uint32_t type;
};
/**
* Read exactly specified number of bytes from socket.
* @param[in] sock socket descriptor
* @param[out] buf buffer for destination data
* @param[in] len number of bytes to read
* @return error code, 0 on success
*/
static int sock_read(int sock, void* buf, size_t len)
{
while (len) {
const ssize_t rcv = recv(sock, buf, len, 0);
if (rcv == 0) {
fprintf(stderr, "IPC read error: no data\n");
return ENOMSG;
}
if (rcv == -1) {
const int ec = errno;
fprintf(stderr, "IPC read error: [%i] %s\n", ec, strerror(ec));
return ec;
}
len -= rcv;
buf = ((uint8_t*)buf) + rcv;
}
return 0;
}
/**
* Write data to the socket.
* @param[in] sock socket descriptor
* @param[in] buf buffer of data of send
* @param[in] len number of bytes to write
* @return error code, 0 on success
*/
static int sock_write(int sock, const void* buf, size_t len)
{
while (len) {
const ssize_t rcv = write(sock, buf, len);
if (rcv == -1) {
const int ec = errno;
fprintf(stderr, "IPC write error: [%i] %s\n", ec, strerror(ec));
return ec;
}
len -= rcv;
buf = ((uint8_t*)buf) + rcv;
}
return 0;
}
/**
* Read IPC message.
* @param[in] sock socket descriptor
* @return IPC response as json object, NULL on errors
*/
static struct json_object* ipc_read(int sock)
{
struct ipc_header hdr;
if (sock_read(sock, &hdr, sizeof(hdr))) {
return NULL;
}
char* raw = malloc(hdr.len + 1);
if (!raw) {
fprintf(stderr, "Not enough memory\n");
return NULL;
}
if (sock_read(sock, raw, hdr.len)) {
free(raw);
return NULL;
}
raw[hdr.len] = 0;
struct json_object* response = json_tokener_parse(raw);
if (!response) {
fprintf(stderr, "Invalid IPC response\n");
}
free(raw);
return response;
}
/**
* Write IPC message.
* @param[in] sock socket descriptor
* @param[in] type message type
* @param[in] payload payload data
* @return error code, 0 on success
*/
static int ipc_write(int sock, enum ipc_msg_type type, const char* payload)
{
struct ipc_header hdr;
memcpy(hdr.magic, ipc_magic, sizeof(ipc_magic));
hdr.len = payload ? strlen(payload) : 0;
hdr.type = type;
int rc = sock_write(sock, &hdr, sizeof(hdr));
if (rc == 0 && hdr.len) {
rc = sock_write(sock, payload, hdr.len);
}
return rc;
}
/**
* Connect to Sway IPC.
* @return socket descriptor (non-negative number) on successful completion,
* otherwise error code (negative number)
*/
static int ipc_connect(void)
{
struct sockaddr_un sa;
memset(&sa, 0, sizeof(sa));
const char* path = getenv("SWAYSOCK");
if (!path) {
fprintf(stderr, "SWAYSOCK variable is not defined\n");
return -ENOENT;
}
size_t len = strlen(path);
if (!len || len > sizeof(sa.sun_path)) {
fprintf(stderr, "Invalid SWAYSOCK variable\n");
return -ENOENT;
}
const int sock = socket(AF_UNIX, SOCK_STREAM, 0);
if (sock == -1) {
const int ec = errno;
fprintf(stderr, "Failed to create IPC socket: [%i] %s\n", ec, strerror(ec));
return -ec;
}
sa.sun_family = AF_UNIX;
memcpy(sa.sun_path, path, len);
len += sizeof(sa) - sizeof(sa.sun_path);
if (connect(sock, (struct sockaddr*)&sa, len) == -1) {
const int ec = errno;
fprintf(stderr, "Failed to connect IPC socket: [%i] %s\n", ec, strerror(ec));
close(sock);
return -ec;
}
return sock;
}
/**
* Subscribe to Sway events.
* @param[in] sock socket descriptor
* @return error code, 0 on success
*/
static int ipc_subscribe(int sock)
{
const char* subscribe = "[ \"window\", \"input\" ]";
int rc = ipc_write(sock, IPC_SUBSCRIBE, subscribe);
if (rc == 0) {
struct json_object* response = ipc_read(sock);
if (!response) {
rc = EIO;
} else {
struct json_object* val;
if (!json_object_object_get_ex(response, "success", &val) ||
!json_object_get_boolean(val)) {
fprintf(stderr, "Unable to subscribe\n");
rc = EIO;
}
json_object_put(response);
}
}
return rc;
}
/**
* Set keyboard layout.
* @param[in] sock socket descriptor
* @param[in] layout keyboard layout index to set
* @return error code, 0 on success
*/
static int ipc_change_layout(int sock, int layout)
{
char cmd[64];
snprintf(cmd, sizeof(cmd), "input * xkb_switch_layout %i", layout);
return ipc_write(sock, IPC_COMMAND, cmd);
}
/**
* Get container info from event message.
* @param[in] msg event message
* @param[out] wnd_id identifier of currently focused window (container)
* @param[out] app_id application id
* @param[out] title title of the window
*/
static void container_info(struct json_object* msg, int* wnd_id,
const char** app_id, const char** title)
{
struct json_object* cnt_node;
struct json_object* sub_node;
if (!json_object_object_get_ex(msg, "container", &cnt_node)) {
return;
}
if (wnd_id && json_object_object_get_ex(cnt_node, "id", &sub_node)) {
*wnd_id = json_object_get_int(sub_node);
}
if (app_id && json_object_object_get_ex(cnt_node, "app_id", &sub_node)) {
*app_id = json_object_get_string(sub_node);
}
if (title && json_object_object_get_ex(cnt_node, "name", &sub_node)) {
*title = json_object_get_string(sub_node);
}
}
/**
* Get keyboard layout index from event message.
* @param[in] msg event message
* @return keyboard layout index or -1 if not found
*/
static int layout_index(struct json_object* msg)
{
struct json_object* input_node;
if (json_object_object_get_ex(msg, "input", &input_node)) {
struct json_object* index_node;
if (json_object_object_get_ex(input_node, "xkb_active_layout_index",
&index_node)) {
const int idx = json_object_get_int(index_node);
if (idx != 0 || errno != EINVAL) {
return idx;
}
}
}
return -1;
}
int sway_monitor(on_focus fn_focus, on_title fn_title,
on_close fn_close, on_layout fn_layout)
{
int rc;
const int sock = ipc_connect();
if (sock < 0) {
rc = -sock;
goto error;
}
rc = ipc_subscribe(sock);
if (rc) {
goto error;
}
while (rc == 0) {
struct json_object* msg = ipc_read(sock);
if (!msg) {
rc = EIO;
} else {
struct json_object* event_node;
if (json_object_object_get_ex(msg, "change", &event_node)) {
int wnd_id = -1;
int layout = -1;
const char* app_id = NULL;
const char* title = NULL;
const char* event_name = json_object_get_string(event_node);
if (strcmp(event_name, "focus") == 0) {
container_info(msg, &wnd_id, &app_id, &title);
layout = fn_focus(wnd_id, app_id, title);
} else if (strcmp(event_name, "title") == 0) {
container_info(msg, &wnd_id, &app_id, &title);
layout = fn_title(wnd_id, app_id, title);
} else if (strcmp(event_name, "close") == 0) {
container_info(msg, &wnd_id, NULL, NULL);
layout = fn_close(wnd_id);
} else if (strcmp(event_name, "xkb_layout") == 0) {
layout = layout_index(msg);
if (layout >= 0) {
fn_layout(layout);
}
layout = -1;
}
if (layout >= 0) {
ipc_change_layout(sock, layout);
}
}
json_object_put(msg);
}
}
error:
if (sock >= 0) {
close(sock);
}
return rc;
}