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/*
* (C) Copyright 2023
* Felix Moessbauer <felix.moessbauer@siemens.com>
*
* SPDX-License-Identifier: GPL-2.0-only
*/
#include <pthread.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <errno.h>
#include <sys/un.h>
#include <sys/stat.h>
#include <sys/socket.h>
#ifdef CONFIG_SYSTEMD
#include <systemd/sd-daemon.h>
#endif
#include "bsdqueue.h"
#include "network_utils.h"
#include "util.h"
#define LISTENQ 1024
struct socket_meta {
char *path;
SIMPLEQ_ENTRY(socket_meta) next;
};
static pthread_mutex_t sockets_toclose_lock = PTHREAD_MUTEX_INITIALIZER;
SIMPLEQ_HEAD(self_sockets, socket_meta);
static struct self_sockets sockets_toclose;
int listener_create(const char *path, int type)
{
struct sockaddr_un servaddr;
int listenfd = -1;
#ifdef CONFIG_SYSTEMD
for (int fd = SD_LISTEN_FDS_START; fd < SD_LISTEN_FDS_START + sd_listen_fds(0); fd++) {
if (sd_is_socket_unix(fd, SOCK_STREAM, 1, path, 0)) {
listenfd = fd;
break;
}
}
if (listenfd == -1) {
TRACE("got no socket at %s from systemd", path);
} else {
TRACE("got socket fd=%d at %s from systemd", listenfd, path);
}
#endif
if (listenfd == -1) {
TRACE("creating socket at %s", path);
listenfd = socket(AF_LOCAL, type, 0);
if (listenfd < 0) {
return -1;
}
unlink(path);
bzero(&servaddr, sizeof(servaddr));
servaddr.sun_family = AF_LOCAL;
strlcpy(servaddr.sun_path, path, sizeof(servaddr.sun_path) - 1);
if(register_socket_unlink(path) != 0){
ERROR("Out of memory, skipping...");
return -1;
}
if (bind(listenfd, (struct sockaddr *) &servaddr, sizeof(servaddr)) < 0) {
close(listenfd);
return -1;
}
if (chmod(path, S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH) < 0)
WARN("chmod cannot be set on socket, error %s", strerror(errno));
}
if (fcntl(listenfd, F_SETFD, FD_CLOEXEC) < 0)
WARN("Could not set %d as cloexec: %s", listenfd, strerror(errno));
if (type == SOCK_STREAM)
if (listen(listenfd, LISTENQ) < 0) {
close(listenfd);
return -1;
}
return listenfd;
}
int register_socket_unlink(const char* path){
struct socket_meta *socketm = malloc(sizeof(*socketm));
if(!socketm){
return -1;
}
socketm->path = strdup(path);
if(!socketm->path){
free(socketm);
return -1;
}
pthread_mutex_lock(&sockets_toclose_lock);
SIMPLEQ_INSERT_TAIL(&sockets_toclose, socketm, next);
pthread_mutex_unlock(&sockets_toclose_lock);
return 0;
}
static void unlink_sockets(void)
{
pthread_mutex_lock(&sockets_toclose_lock);
while(!SIMPLEQ_EMPTY(&sockets_toclose)) {
struct socket_meta *socketm;
socketm = SIMPLEQ_FIRST(&sockets_toclose);
TRACE("unlink socket %s", socketm->path);
unlink(socketm->path);
free(socketm->path);
SIMPLEQ_REMOVE_HEAD(&sockets_toclose, next);
free(socketm);
}
pthread_mutex_unlock(&sockets_toclose_lock);
}
int init_socket_unlink_handler(void){
SIMPLEQ_INIT(&sockets_toclose);
return atexit(unlink_sockets);
}
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