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Adding IPC v1.5.5 patch

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This commit is contained in:
bakkeby
2020-09-08 13:34:58 +02:00
parent 4379517c25
commit 95611ca0bd
11 changed files with 2815 additions and 0 deletions
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548
patch/ipc/dwm-msg.c Normal file
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#include <ctype.h>
#include <errno.h>
#include <inttypes.h>
#include <stdarg.h>
#include <stdint.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <yajl/yajl_gen.h>
#define IPC_MAGIC "DWM-IPC"
// clang-format off
#define IPC_MAGIC_ARR { 'D', 'W', 'M', '-', 'I', 'P', 'C' }
// clang-format on
#define IPC_MAGIC_LEN 7 // Not including null char
#define IPC_EVENT_TAG_CHANGE "tag_change_event"
#define IPC_EVENT_CLIENT_FOCUS_CHANGE "client_focus_change_event"
#define IPC_EVENT_LAYOUT_CHANGE "layout_change_event"
#define IPC_EVENT_MONITOR_FOCUS_CHANGE "monitor_focus_change_event"
#define IPC_EVENT_FOCUSED_TITLE_CHANGE "focused_title_change_event"
#define IPC_EVENT_FOCUSED_STATE_CHANGE "focused_state_change_event"
#define YSTR(str) yajl_gen_string(gen, (unsigned char *)str, strlen(str))
#define YINT(num) yajl_gen_integer(gen, num)
#define YDOUBLE(num) yajl_gen_double(gen, num)
#define YBOOL(v) yajl_gen_bool(gen, v)
#define YNULL() yajl_gen_null(gen)
#define YARR(body) \
{ \
yajl_gen_array_open(gen); \
body; \
yajl_gen_array_close(gen); \
}
#define YMAP(body) \
{ \
yajl_gen_map_open(gen); \
body; \
yajl_gen_map_close(gen); \
}
typedef unsigned long Window;
const char *DEFAULT_SOCKET_PATH = "/tmp/dwm.sock";
static int sock_fd = -1;
static unsigned int ignore_reply = 0;
typedef enum IPCMessageType {
IPC_TYPE_RUN_COMMAND = 0,
IPC_TYPE_GET_MONITORS = 1,
IPC_TYPE_GET_TAGS = 2,
IPC_TYPE_GET_LAYOUTS = 3,
IPC_TYPE_GET_DWM_CLIENT = 4,
IPC_TYPE_SUBSCRIBE = 5,
IPC_TYPE_EVENT = 6
} IPCMessageType;
// Every IPC message must begin with this
typedef struct dwm_ipc_header {
uint8_t magic[IPC_MAGIC_LEN];
uint32_t size;
uint8_t type;
} __attribute((packed)) dwm_ipc_header_t;
static int
recv_message(uint8_t *msg_type, uint32_t *reply_size, uint8_t **reply)
{
uint32_t read_bytes = 0;
const int32_t to_read = sizeof(dwm_ipc_header_t);
char header[to_read];
char *walk = header;
// Try to read header
while (read_bytes < to_read) {
ssize_t n = read(sock_fd, header + read_bytes, to_read - read_bytes);
if (n == 0) {
if (read_bytes == 0) {
fprintf(stderr, "Unexpectedly reached EOF while reading header.");
fprintf(stderr,
"Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
read_bytes, to_read);
return -2;
} else {
fprintf(stderr, "Unexpectedly reached EOF while reading header.");
fprintf(stderr,
"Read %" PRIu32 " bytes, expected %" PRIu32 " total bytes.\n",
read_bytes, to_read);
return -3;
}
} else if (n == -1) {
return -1;
}
read_bytes += n;
}
// Check if magic string in header matches
if (memcmp(walk, IPC_MAGIC, IPC_MAGIC_LEN) != 0) {
fprintf(stderr, "Invalid magic string. Got '%.*s', expected '%s'\n",
IPC_MAGIC_LEN, walk, IPC_MAGIC);
return -3;
}
walk += IPC_MAGIC_LEN;
// Extract reply size
memcpy(reply_size, walk, sizeof(uint32_t));
walk += sizeof(uint32_t);
// Extract message type
memcpy(msg_type, walk, sizeof(uint8_t));
walk += sizeof(uint8_t);
(*reply) = malloc(*reply_size);
// Extract payload
read_bytes = 0;
while (read_bytes < *reply_size) {
ssize_t n = read(sock_fd, *reply + read_bytes, *reply_size - read_bytes);
if (n == 0) {
fprintf(stderr, "Unexpectedly reached EOF while reading payload.");
fprintf(stderr, "Read %" PRIu32 " bytes, expected %" PRIu32 " bytes.\n",
read_bytes, *reply_size);
free(*reply);
return -2;
} else if (n == -1) {
if (errno == EINTR || errno == EAGAIN) continue;
free(*reply);
return -1;
}
read_bytes += n;
}
return 0;
}
static int
read_socket(IPCMessageType *msg_type, uint32_t *msg_size, char **msg)
{
int ret = -1;
while (ret != 0) {
ret = recv_message((uint8_t *)msg_type, msg_size, (uint8_t **)msg);
if (ret < 0) {
// Try again (non-fatal error)
if (ret == -1 && (errno == EINTR || errno == EAGAIN)) continue;
fprintf(stderr, "Error receiving response from socket. ");
fprintf(stderr, "The connection might have been lost.\n");
exit(2);
}
}
return 0;
}
static ssize_t
write_socket(const void *buf, size_t count)
{
size_t written = 0;
while (written < count) {
const ssize_t n =
write(sock_fd, ((uint8_t *)buf) + written, count - written);
if (n == -1) {
if (errno == EAGAIN || errno == EWOULDBLOCK || errno == EINTR)
continue;
else
return n;
}
written += n;
}
return written;
}
static void
connect_to_socket()
{
struct sockaddr_un addr;
int sock = socket(AF_UNIX, SOCK_STREAM, 0);
// Initialize struct to 0
memset(&addr, 0, sizeof(struct sockaddr_un));
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, DEFAULT_SOCKET_PATH);
connect(sock, (const struct sockaddr *)&addr, sizeof(struct sockaddr_un));
sock_fd = sock;
}
static int
send_message(IPCMessageType msg_type, uint32_t msg_size, uint8_t *msg)
{
dwm_ipc_header_t header = {
.magic = IPC_MAGIC_ARR, .size = msg_size, .type = msg_type};
size_t header_size = sizeof(dwm_ipc_header_t);
size_t total_size = header_size + msg_size;
uint8_t buffer[total_size];
// Copy header to buffer
memcpy(buffer, &header, header_size);
// Copy message to buffer
memcpy(buffer + header_size, msg, header.size);
write_socket(buffer, total_size);
return 0;
}
static int
is_float(const char *s)
{
size_t len = strlen(s);
int is_dot_used = 0;
int is_minus_used = 0;
// Floats can only have one decimal point in between or digits
// Optionally, floats can also be below zero (negative)
for (int i = 0; i < len; i++) {
if (isdigit(s[i]))
continue;
else if (!is_dot_used && s[i] == '.' && i != 0 && i != len - 1) {
is_dot_used = 1;
continue;
} else if (!is_minus_used && s[i] == '-' && i == 0) {
is_minus_used = 1;
continue;
} else
return 0;
}
return 1;
}
static int
is_unsigned_int(const char *s)
{
size_t len = strlen(s);
// Unsigned int can only have digits
for (int i = 0; i < len; i++) {
if (isdigit(s[i]))
continue;
else
return 0;
}
return 1;
}
static int
is_signed_int(const char *s)
{
size_t len = strlen(s);
// Signed int can only have digits and a negative sign at the start
for (int i = 0; i < len; i++) {
if (isdigit(s[i]))
continue;
else if (i == 0 && s[i] == '-') {
continue;
} else
return 0;
}
return 1;
}
static void
flush_socket_reply()
{
IPCMessageType reply_type;
uint32_t reply_size;
char *reply;
read_socket(&reply_type, &reply_size, &reply);
free(reply);
}
static void
print_socket_reply()
{
IPCMessageType reply_type;
uint32_t reply_size;
char *reply;
read_socket(&reply_type, &reply_size, &reply);
printf("%.*s\n", reply_size, reply);
fflush(stdout);
free(reply);
}
static int
run_command(const char *name, char *args[], int argc)
{
const unsigned char *msg;
size_t msg_size;
yajl_gen gen = yajl_gen_alloc(NULL);
// Message format:
// {
// "command": "<name>",
// "args": [ ... ]
// }
// clang-format off
YMAP(
YSTR("command"); YSTR(name);
YSTR("args"); YARR(
for (int i = 0; i < argc; i++) {
if (is_signed_int(args[i])) {
long long num = atoll(args[i]);
YINT(num);
} else if (is_float(args[i])) {
float num = atof(args[i]);
YDOUBLE(num);
} else {
YSTR(args[i]);
}
}
)
)
// clang-format on
yajl_gen_get_buf(gen, &msg, &msg_size);
send_message(IPC_TYPE_RUN_COMMAND, msg_size, (uint8_t *)msg);
if (!ignore_reply)
print_socket_reply();
else
flush_socket_reply();
yajl_gen_free(gen);
return 0;
}
static int
get_monitors()
{
send_message(IPC_TYPE_GET_MONITORS, 1, (uint8_t *)"");
print_socket_reply();
return 0;
}
static int
get_tags()
{
send_message(IPC_TYPE_GET_TAGS, 1, (uint8_t *)"");
print_socket_reply();
return 0;
}
static int
get_layouts()
{
send_message(IPC_TYPE_GET_LAYOUTS, 1, (uint8_t *)"");
print_socket_reply();
return 0;
}
static int
get_dwm_client(Window win)
{
const unsigned char *msg;
size_t msg_size;
yajl_gen gen = yajl_gen_alloc(NULL);
// Message format:
// {
// "client_window_id": "<win>"
// }
// clang-format off
YMAP(
YSTR("client_window_id"); YINT(win);
)
// clang-format on
yajl_gen_get_buf(gen, &msg, &msg_size);
send_message(IPC_TYPE_GET_DWM_CLIENT, msg_size, (uint8_t *)msg);
print_socket_reply();
yajl_gen_free(gen);
return 0;
}
static int
subscribe(const char *event)
{
const unsigned char *msg;
size_t msg_size;
yajl_gen gen = yajl_gen_alloc(NULL);
// Message format:
// {
// "event": "<event>",
// "action": "subscribe"
// }
// clang-format off
YMAP(
YSTR("event"); YSTR(event);
YSTR("action"); YSTR("subscribe");
)
// clang-format on
yajl_gen_get_buf(gen, &msg, &msg_size);
send_message(IPC_TYPE_SUBSCRIBE, msg_size, (uint8_t *)msg);
if (!ignore_reply)
print_socket_reply();
else
flush_socket_reply();
yajl_gen_free(gen);
return 0;
}
static void
usage_error(const char *prog_name, const char *format, ...)
{
va_list args;
va_start(args, format);
fprintf(stderr, "Error: ");
vfprintf(stderr, format, args);
fprintf(stderr, "\nusage: %s <command> [...]\n", prog_name);
fprintf(stderr, "Try '%s help'\n", prog_name);
va_end(args);
exit(1);
}
static void
print_usage(const char *name)
{
printf("usage: %s [options] <command> [...]\n", name);
puts("");
puts("Commands:");
puts(" run_command <name> [args...] Run an IPC command");
puts("");
puts(" get_monitors Get monitor properties");
puts("");
puts(" get_tags Get list of tags");
puts("");
puts(" get_layouts Get list of layouts");
puts("");
puts(" get_dwm_client <window_id> Get dwm client proprties");
puts("");
puts(" subscribe [events...] Subscribe to specified events");
puts(" Options: " IPC_EVENT_TAG_CHANGE ",");
puts(" " IPC_EVENT_LAYOUT_CHANGE ",");
puts(" " IPC_EVENT_CLIENT_FOCUS_CHANGE ",");
puts(" " IPC_EVENT_MONITOR_FOCUS_CHANGE ",");
puts(" " IPC_EVENT_FOCUSED_TITLE_CHANGE ",");
puts(" " IPC_EVENT_FOCUSED_STATE_CHANGE);
puts("");
puts(" help Display this message");
puts("");
puts("Options:");
puts(" --ignore-reply Don't print reply messages from");
puts(" run_command and subscribe.");
puts("");
}
int
main(int argc, char *argv[])
{
const char *prog_name = argv[0];
connect_to_socket();
if (sock_fd == -1) {
fprintf(stderr, "Failed to connect to socket\n");
return 1;
}
int i = 1;
if (strcmp(argv[i], "--ignore-reply") == 0) {
ignore_reply = 1;
i++;
}
// if (i >= argc) usage_error(prog_name, "Expected an argument, got none");
if (!argc || strcmp(argv[i], "help") == 0)
print_usage(prog_name);
else if (strcmp(argv[i], "run_command") == 0) {
if (++i >= argc) usage_error(prog_name, "No command specified");
// Command name
char *command = argv[i];
// Command arguments are everything after command name
char **command_args = argv + ++i;
// Number of command arguments
int command_argc = argc - i;
run_command(command, command_args, command_argc);
} else if (strcmp(argv[i], "get_monitors") == 0) {
get_monitors();
} else if (strcmp(argv[i], "get_tags") == 0) {
get_tags();
} else if (strcmp(argv[i], "get_layouts") == 0) {
get_layouts();
} else if (strcmp(argv[i], "get_dwm_client") == 0) {
if (++i < argc) {
if (is_unsigned_int(argv[i])) {
Window win = atol(argv[i]);
get_dwm_client(win);
} else
usage_error(prog_name, "Expected unsigned integer argument");
} else
usage_error(prog_name, "Expected the window id");
} else if (strcmp(argv[i], "subscribe") == 0) {
if (++i < argc) {
for (int j = i; j < argc; j++) subscribe(argv[j]);
} else
usage_error(prog_name, "Expected event name");
// Keep listening for events forever
while (1) {
print_socket_reply();
}
} else
usage_error(prog_name, "Invalid argument '%s'", argv[i]);
return 0;
}