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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 "whitelist_control.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/thread.h>
#include <processing/jobs/callback_job.h>
#include "whitelist_msg.h"
typedef struct private_whitelist_control_t private_whitelist_control_t;
/**
* Private data of an whitelist_control_t object.
*/
struct private_whitelist_control_t {
/**
* Public whitelist_control_t interface.
*/
whitelist_control_t public;
/**
* Whitelist
*/
whitelist_listener_t *listener;
/**
* Whitelist unix socket file descriptor
*/
int socket;
/**
* Callback job dispatching commands
*/
callback_job_t *job;
};
/**
* Open whitelist unix socket
*/
static bool open_socket(private_whitelist_control_t *this)
{
struct sockaddr_un addr;
mode_t old;
addr.sun_family = AF_UNIX;
strcpy(addr.sun_path, WHITELIST_SOCKET);
this->socket = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (this->socket == -1)
{
DBG1(DBG_CFG, "creating whitelist 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 whitelist socket failed: %s", strerror(errno));
close(this->socket);
return FALSE;
}
umask(old);
if (chown(addr.sun_path, charon->uid, charon->gid) != 0)
{
DBG1(DBG_CFG, "changing whitelist socket permissions failed: %s",
strerror(errno));
}
if (listen(this->socket, 10) < 0)
{
DBG1(DBG_CFG, "listening on whitelist socket failed: %s", strerror(errno));
close(this->socket);
unlink(addr.sun_path);
return FALSE;
}
return TRUE;
}
/**
* Dispatch a received message
*/
static void dispatch(private_whitelist_control_t *this,
int fd, whitelist_msg_t *msg)
{
identification_t *id, *current;
enumerator_t *enumerator;
msg->id[sizeof(msg->id)-1] = 0;
id = identification_create_from_string(msg->id);
switch (msg->type)
{
case WHITELIST_ADD:
this->listener->add(this->listener, id);
break;
case WHITELIST_REMOVE:
this->listener->remove(this->listener, id);
break;
case WHITELIST_LIST:
enumerator = this->listener->create_enumerator(this->listener);
while (enumerator->enumerate(enumerator, ¤t))
{
if (current->matches(current, id))
{
snprintf(msg->id, sizeof(msg->id), "%Y", current);
if (send(fd, msg, sizeof(*msg), 0) != sizeof(*msg))
{
DBG1(DBG_CFG, "listing whitelist failed");
break;
}
}
}
enumerator->destroy(enumerator);
msg->type = WHITELIST_END;
memset(msg->id, 0, sizeof(msg->id));
send(fd, msg, sizeof(*msg), 0);
break;
case WHITELIST_FLUSH:
this->listener->flush(this->listener, id);
break;
case WHITELIST_ENABLE:
this->listener->set_active(this->listener, TRUE);
break;
case WHITELIST_DISABLE:
this->listener->set_active(this->listener, FALSE);
break;
default:
DBG1(DBG_CFG, "received unknown whitelist command");
break;
}
id->destroy(id);
}
/**
* Accept whitelist control connections, dispatch
*/
static job_requeue_t receive(private_whitelist_control_t *this)
{
struct sockaddr_un addr;
int fd, len = sizeof(addr);
whitelist_msg_t msg;
bool oldstate;
oldstate = thread_cancelability(TRUE);
fd = accept(this->socket, (struct sockaddr*)&addr, &len);
thread_cancelability(oldstate);
if (fd != -1)
{
while (TRUE)
{
oldstate = thread_cancelability(TRUE);
len = recv(fd, &msg, sizeof(msg), 0);
thread_cancelability(oldstate);
if (len == sizeof(msg))
{
dispatch(this, fd, &msg);
}
else
{
if (len != 0)
{
DBG1(DBG_CFG, "receiving whitelist msg failed: %s",
strerror(errno));
}
break;
}
}
close(fd);
}
else
{
DBG1(DBG_CFG, "accepting whitelist connection failed: %s",
strerror(errno));
}
return JOB_REQUEUE_FAIR;
}
METHOD(whitelist_control_t, destroy, void,
private_whitelist_control_t *this)
{
this->job->cancel(this->job);
close(this->socket);
free(this);
}
/**
* See header
*/
whitelist_control_t *whitelist_control_create(whitelist_listener_t *listener)
{
private_whitelist_control_t *this;
INIT(this,
.public = {
.destroy = _destroy,
},
.listener = listener,
);
if (!open_socket(this))
{
free(this);
return NULL;
}
this->job = callback_job_create_with_prio((callback_job_cb_t)receive,
this, NULL, NULL, JOB_PRIO_CRITICAL);
lib->processor->queue_job(lib->processor, (job_t*)this->job);
return &this->public;
}
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