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/*
* Copyright (C) 2011 Martin Willi
* Copyright (C) 2011 revosec AG
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the
* Free Software Foundation; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
* or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* for more details.
*/
#include "duplicheck_notify.h"
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <unistd.h>
#include <errno.h>
#include <daemon.h>
#include <threading/mutex.h>
#include <threading/thread.h>
#include <collections/linked_list.h>
#include <processing/jobs/callback_job.h>
#define DUPLICHECK_SOCKET IPSEC_PIDDIR "/charon.dck"
typedef struct private_duplicheck_notify_t private_duplicheck_notify_t;
/**
* Private data of an duplicheck_notify_t object.
*/
struct private_duplicheck_notify_t {
/**
* Public duplicheck_notify_t interface.
*/
duplicheck_notify_t public;
/**
* Mutex to lock list
*/
mutex_t *mutex;
/**
* List of connected sockets
*/
linked_list_t *connected;
/**
* Socket dispatching connections
*/
int socket;
};
/**
* Open duplicheck unix socket
*/
static bool open_socket(private_duplicheck_notify_t *this)
{
struct sockaddr_un addr;
mode_t old;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, DUPLICHECK_SOCKET);
this->socket = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (this->socket == -1)
{
DBG1(DBG_CFG, "creating duplicheck socket failed");
return FALSE;
}
unlink(addr.sun_path);
old = umask(~(S_IRWXU | S_IRWXG));
if (bind(this->socket, (struct sockaddr*)&addr, sizeof(addr)) < 0)
{
DBG1(DBG_CFG, "binding duplicheck socket failed: %s", strerror(errno));
close(this->socket);
return FALSE;
}
umask(old);
if (chown(addr.sun_path, charon->caps->get_uid(charon->caps),
charon->caps->get_gid(charon->caps)) != 0)
{
DBG1(DBG_CFG, "changing duplicheck socket permissions failed: %s",
strerror(errno));
}
if (listen(this->socket, 3) < 0)
{
DBG1(DBG_CFG, "listening on duplicheck socket failed: %s",
strerror(errno));
close(this->socket);
unlink(addr.sun_path);
return FALSE;
}
return TRUE;
}
/**
* Accept duplicheck notification connections
*/
static job_requeue_t receive(private_duplicheck_notify_t *this)
{
struct sockaddr_un addr;
int len = sizeof(addr);
uintptr_t fd;
bool oldstate;
oldstate = thread_cancelability(TRUE);
fd = accept(this->socket, (struct sockaddr*)&addr, &len);
thread_cancelability(oldstate);
if (fd != -1)
{
this->mutex->lock(this->mutex);
this->connected->insert_last(this->connected, (void*)fd);
this->mutex->unlock(this->mutex);
}
else
{
DBG1(DBG_CFG, "accepting duplicheck connection failed: %s",
strerror(errno));
}
return JOB_REQUEUE_FAIR;
}
METHOD(duplicheck_notify_t, send_, void,
private_duplicheck_notify_t *this, identification_t *id)
{
char buf[128];
enumerator_t *enumerator;
uintptr_t fd;
int len;
len = snprintf(buf, sizeof(buf), "%Y", id);
if (len > 0 && len < sizeof(buf))
{
this->mutex->lock(this->mutex);
enumerator = this->connected->create_enumerator(this->connected);
while (enumerator->enumerate(enumerator, &fd))
{
if (send(fd, &buf, len + 1, 0) != len + 1)
{
DBG1(DBG_CFG, "sending duplicheck notify failed: %s",
strerror(errno));
this->connected->remove_at(this->connected, enumerator);
close(fd);
}
}
enumerator->destroy(enumerator);
this->mutex->unlock(this->mutex);
}
}
METHOD(duplicheck_notify_t, destroy, void,
private_duplicheck_notify_t *this)
{
enumerator_t *enumerator;
uintptr_t fd;
enumerator = this->connected->create_enumerator(this->connected);
while (enumerator->enumerate(enumerator, &fd))
{
close(fd);
}
enumerator->destroy(enumerator);
this->connected->destroy(this->connected);
this->mutex->destroy(this->mutex);
free(this);
}
/**
* See header
*/
duplicheck_notify_t *duplicheck_notify_create()
{
private_duplicheck_notify_t *this;
INIT(this,
.public = {
.send = _send_,
.destroy = _destroy,
},
.connected = linked_list_create(),
.mutex = mutex_create(MUTEX_TYPE_DEFAULT),
);
if (!open_socket(this))
{
destroy(this);
return NULL;
}
lib->processor->queue_job(lib->processor,
(job_t*)callback_job_create_with_prio((callback_job_cb_t)receive, this,
NULL, (callback_job_cancel_t)return_false, JOB_PRIO_CRITICAL));
return &this->public;
}
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