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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019-2020 Todd C. Miller <Todd.Miller@sudo.ws>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
/*
* This is an open source non-commercial project. Dear PVS-Studio, please check it.
* PVS-Studio Static Code Analyzer for C, C++ and C#: http://www.viva64.com
*/
#include <config.h>
#include <string.h>
#include <ctype.h>
#include <stdlib.h>
#include <sudo_gettext.h>
#include <sudo_compat.h>
#include "sudo_python_debug.h"
#include <sudo_queue.h>
#include <sudo_conf.h>
#include <sudo_fatal.h>
static int python_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
static unsigned int python_debug_refcnt;
static const char *const python_subsystem_names[] = {
"py_calls", // logs c -> py calls
"c_calls", // logs py -> c calls
"load", // logs python plugin loading / unloading
"sudo_cb", // logs sudo callback calls
"internal", // logs internal functions of the language wrapper plugin
"plugin", // logs whatever log the python module would like to log through sudo.debug API
NULL
};
#define NUM_SUBSYSTEMS sizeof(python_subsystem_names) / sizeof(*python_subsystem_names) - 1
/* Subsystem IDs assigned at registration time. */
unsigned int python_subsystem_ids[NUM_SUBSYSTEMS];
/*
* Parse the "filename flags,..." debug_flags entry and insert a new
* sudo_debug_file struct into debug_files.
*/
bool
python_debug_parse_flags(struct sudo_conf_debug_file_list *debug_files,
const char *entry)
{
/* Already initialized? */
if (python_debug_instance != SUDO_DEBUG_INSTANCE_INITIALIZER)
return true;
return sudo_debug_parse_flags(debug_files, entry) != -1;
}
/*
* Register the specified debug files and program with the
* debug subsystem, freeing the debug list when done.
* Sets the active debug instance as a side effect.
*/
bool
python_debug_register(const char *program,
struct sudo_conf_debug_file_list *debug_files)
{
int instance = python_debug_instance;
struct sudo_debug_file *debug_file, *debug_next;
/* Setup debugging if indicated. */
if (debug_files != NULL && !TAILQ_EMPTY(debug_files)) {
if (program != NULL) {
instance = sudo_debug_register(program, python_subsystem_names,
python_subsystem_ids, debug_files, -1);
}
TAILQ_FOREACH_SAFE(debug_file, debug_files, entries, debug_next) {
TAILQ_REMOVE(debug_files, debug_file, entries);
free(debug_file->debug_file);
free(debug_file->debug_flags);
free(debug_file);
}
}
switch (instance) {
case SUDO_DEBUG_INSTANCE_ERROR:
return false;
case SUDO_DEBUG_INSTANCE_INITIALIZER:
/* Nothing to do */
break;
default:
/* New debug instance or additional reference on existing one. */
python_debug_instance = instance;
sudo_debug_set_active_instance(python_debug_instance);
python_debug_refcnt++;
break;
}
return true;
}
/*
* Deregister python_debug_instance if it is registered.
*/
void
python_debug_deregister(void)
{
debug_decl(python_debug_deregister, PYTHON_DEBUG_INTERNAL);
if (python_debug_refcnt != 0) {
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
if (--python_debug_refcnt == 0) {
if (sudo_debug_deregister(python_debug_instance) < 1)
python_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
}
}
}
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