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/*
* The MIT License (MIT)
*
* Copyright (c) 2020 Scott Moreau
* Copyright (c) 2020 Érico Nogueira
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to deal
* in the Software without restriction, including without limitation the rights
* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in all
* copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
* SOFTWARE.
*
*/
#define _GNU_SOURCE
#include <fcntl.h>
#include <stdio.h>
#include <stdlib.h>
#include <signal.h>
#include <string.h>
#include <errno.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#ifdef __FreeBSD__
#include <sys/ucred.h>
#define ucred xucred
#define pid cr_pid
#define SO_PEERCRED LOCAL_PEERCRED
#undef SOL_SOCKET
#define SOL_SOCKET SOL_LOCAL
#endif
// size of field sun_path in struct sockaddr_un
#define pathlen ((int)sizeof(((struct sockaddr_un *)NULL)->sun_path))
int main()
{
char socket_path[pathlen];
char *xdg_runtime_dir = getenv("XDG_RUNTIME_DIR");
char *wayland_display = getenv("WAYLAND_DISPLAY");
if (!wayland_display)
{
fprintf(stderr, "WAYLAND_DISPLAY not set\n");
return -1;
}
// WAYLAND_DISPLAY can be an absolute path
int wl_display_abs = wayland_display[0] == '/';
if (!wl_display_abs && !xdg_runtime_dir)
{
fprintf(stderr, "WAYLAND_DISPLAY is not an absolute path and XDG_RUNTIME_DIR is not set\n");
return -1;
}
if (wl_display_abs)
{
if (snprintf(socket_path, pathlen, "%s", wayland_display) >= pathlen)
{
fprintf(stderr, "WAYLAND_DISPLAY path \"%s\" is too long (max is %d)\n", wayland_display, pathlen);
return -1;
}
} else
{
if (snprintf(socket_path, pathlen, "%s/%s", xdg_runtime_dir, wayland_display) >= pathlen)
{
fprintf(stderr, "XDG_RUNTIME_DIR/WAYLAND_DISPLAY path \"%s/%s\" is too long (max is %d)\n", xdg_runtime_dir, wayland_display, pathlen);
return -1;
}
}
int fd = socket(AF_UNIX, SOCK_STREAM, 0);
if (fd == -1)
{
perror("Failed to create socket");
return -1;
}
struct sockaddr_un socket = { 0 };
socket.sun_family = AF_UNIX;
// string length was checked in snprintf
strcpy(socket.sun_path, socket_path);
int ret = connect(fd, (struct sockaddr *)&socket, sizeof(socket));
if (ret == -1)
{
fprintf(stderr, "Failed to connect to socket %s: %m\n", socket.sun_path);
return -1;
}
struct ucred peer_cred;
socklen_t optlen = sizeof(peer_cred);
ret = getsockopt(fd, SOL_SOCKET, SO_PEERCRED, &peer_cred, &optlen);
if (ret == -1)
{
fprintf(stderr, "Error getting credentials for peer: %m\n");
return -1;
}
ret = kill(peer_cred.pid, SIGTERM);
if (ret == -1)
{
fprintf(stderr, "Error killing pid %d: %m\n", peer_cred.pid);
return -1;
}
return 0;
}
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