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/**
* Copyright (C) 2022 Matt Burt, all xrdp contributors
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
/**
* @file libipm/libipm.c
* @brief Inter-Process Messaging building and parsing definitions
*/
#if defined(HAVE_CONFIG_H)
#include <config_ac.h>
#endif
#include "libipm.h"
#include "libipm_private.h"
#include "libipm_facilities.h"
#include "trans.h"
#include "log.h"
#include "os_calls.h"
const char *libipm_valid_type_chars = "ybnqiuxtsdhogB";
/*****************************************************************************/
void
libipm_msg_in_close_file_descriptors(struct trans *self)
{
struct libipm_priv *priv = (struct libipm_priv *)self->extra_data;
if (priv != NULL)
{
unsigned int i;
for (i = priv->in_fd_index ; i < priv->in_fd_count; ++i)
{
g_file_close(priv->in_fds[i]);
}
priv->in_fd_count = 0;
priv->in_fd_index = 0;
}
}
/**************************************************************************//**
* Send function for a struct trans initialised with libipm_init_trans()
*
* @param self Transport to send on
* @param data pointer to data to send
* @param len Length of data to send
* @return As for write(2)
*/
static int
libipm_trans_send_proc(struct trans *self, const char *data, int len)
{
int rv;
struct libipm_priv *priv = (struct libipm_priv *)self->extra_data;
if (priv != NULL && data == self->out_s->data)
{
/* We're sending the message header. Send any file descriptors
* as ancillary data */
rv = g_sck_send_fd_set(self->sck, data, len,
priv->out_fds, priv->out_fd_count);
}
else
{
rv = g_sck_send(self->sck, data, len, 0);
}
return rv;
}
/**************************************************************************//**
* Receive function for a struct trans initialised with libipm_init_trans()
*
* @param self Transport to receive on
* @param data pointer to receive data buffer
* @param len Length of data to read
* @return As for read(2)
*/
static int
libipm_trans_recv_proc(struct trans *self, char *data, int len)
{
int rv;
struct libipm_priv *priv = (struct libipm_priv *)self->extra_data;
if (priv != NULL && data == self->in_s->data)
{
/* We're receiving the message header */
unsigned int fdcount;
/* Check there are no live file descriptors in the input
* buffer from a previous message. This shouldn't happen, but
* if by some chance it does, we could leak file descriptors */
if (priv->in_fd_count > 0)
{
LOG(LOG_LEVEL_WARNING, "Unconsumed file descriptors detected");
libipm_msg_in_close_file_descriptors(self);
}
rv = g_sck_recv_fd_set(self->sck, data, len,
priv->in_fds, MAX_FD_PER_MSG,
&fdcount);
if (fdcount > MAX_FD_PER_MSG)
{
LOG(LOG_LEVEL_WARNING,
"%d file descriptors were discarded on recvmsg()",
fdcount - MAX_FD_PER_MSG);
fdcount = MAX_FD_PER_MSG;
}
priv->in_fd_count = fdcount;
}
else
{
rv = g_sck_recv(self->sck, data, len, 0);
}
return rv;
}
/**************************************************************************//**
* Destructor for a struct trans initialised with libipm_init_trans()
*
* @param trans Transport to destroy
*/
static void
libipm_trans_destructor(struct trans *trans)
{
struct libipm_priv *priv = (struct libipm_priv *)trans->extra_data;
libipm_msg_in_close_file_descriptors(trans);
if (priv != NULL)
{
if ((priv->flags & LIBIPM_E_MSG_IN_ERASE_AFTER_USE) != 0 &&
trans->in_s->data != NULL)
{
g_memset(trans->in_s->data, '\0',
trans->in_s->end - trans->in_s->data);
}
g_free(priv);
trans->extra_data = NULL;
trans->extra_destructor = NULL;
}
}
/*****************************************************************************/
enum libipm_status
libipm_init_trans(struct trans *trans,
enum libipm_facility facility,
const char *(*msgno_to_str)(unsigned short msgno))
{
struct libipm_priv *priv;
enum libipm_status rv;
if (trans->extra_data != NULL || trans->extra_destructor != NULL)
{
LOG(LOG_LEVEL_ERROR, "%s() called with sub-classed transport",
__func__);
rv = E_LI_PROGRAM_ERROR;
}
else if ((priv = g_new0(struct libipm_priv, 1)) == 0)
{
LOG(LOG_LEVEL_ERROR, "%s() out of memory", __func__);
rv = E_LI_NO_MEMORY;
}
else
{
priv->facility = facility;
priv->msgno_to_str = msgno_to_str;
trans->trans_send = libipm_trans_send_proc;
trans->trans_recv = libipm_trans_recv_proc;
trans->extra_data = priv;
trans->extra_destructor = libipm_trans_destructor;
g_sck_set_non_blocking(trans->sck);
libipm_msg_in_reset(trans);
rv = E_LI_SUCCESS;
}
return rv;
}
/*****************************************************************************/
void
libipm_set_flags(struct trans *trans, unsigned int flags)
{
struct libipm_priv *priv = (struct libipm_priv *)trans->extra_data;
if (priv != NULL)
{
priv->flags |= flags;
}
}
/*****************************************************************************/
void
libipm_clear_flags(struct trans *trans, unsigned int flags)
{
struct libipm_priv *priv = (struct libipm_priv *)trans->extra_data;
if (priv != NULL)
{
priv->flags &= ~flags;
}
}
/*****************************************************************************/
void
libipm_change_facility(struct trans *trans,
enum libipm_facility old_facility,
enum libipm_facility new_facility)
{
struct libipm_priv *priv = (struct libipm_priv *)trans->extra_data;
if (priv != NULL)
{
if (priv->facility != old_facility)
{
LOG(LOG_LEVEL_WARNING, "Not changing libipm facility - bad value");
}
else
{
priv->facility = new_facility;
}
}
}
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