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Copy pathsudo_python_debug.c
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149 lines (131 loc) · 4.81 KB
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/*
* SPDX-License-Identifier: ISC
*
* Copyright (c) 2019 Todd C. Miller <[email protected]>
*
* 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>
#ifdef HAVE_STRING_H
# include <string.h>
#endif
#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 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. */
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)
{
struct sudo_debug_file *debug_file;
const char *filename, *flags;
size_t namelen;
/* Already initialized? */
if (python_debug_instance != SUDO_DEBUG_INSTANCE_INITIALIZER)
return true;
/* Only process new-style debug flags: filename flags,... */
filename = entry;
if (*filename != '/' || (flags = strpbrk(filename, " \t")) == NULL)
return true;
namelen = (size_t)(flags - filename);
while (isblank((unsigned char)*flags))
flags++;
if (*flags != '\0') {
if ((debug_file = calloc(1, sizeof(*debug_file))) == NULL)
goto oom;
if ((debug_file->debug_file = strndup(filename, namelen)) == NULL)
goto oom;
if ((debug_file->debug_flags = strdup(flags)) == NULL)
goto oom;
TAILQ_INSERT_TAIL(debug_files, debug_file, entries);
}
return true;
oom:
if (debug_file != NULL) {
free(debug_file->debug_file);
free(debug_file->debug_flags);
free(debug_file);
}
sudo_warnx_nodebug(U_("%s: %s"), "python_debug_parse_flags",
U_("unable to allocate memory"));
return false;
}
/*
* 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)
{
struct sudo_debug_file *debug_file, *debug_next;
/* Already initialized? */
if (python_debug_instance != SUDO_DEBUG_INSTANCE_INITIALIZER) {
sudo_debug_set_active_instance(python_debug_instance);
}
/* Setup debugging if indicated. */
if (debug_files != NULL && !TAILQ_EMPTY(debug_files)) {
if (program != NULL) {
python_debug_instance = sudo_debug_register(program,
python_subsystem_names, (unsigned int *)python_subsystem_ids, debug_files);
if (python_debug_instance == SUDO_DEBUG_INSTANCE_ERROR)
return false;
}
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);
}
}
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_instance != SUDO_DEBUG_INSTANCE_INITIALIZER) {
sudo_debug_exit(__func__, __FILE__, __LINE__, sudo_debug_subsys);
sudo_debug_deregister(python_debug_instance);
python_debug_instance = SUDO_DEBUG_INSTANCE_INITIALIZER;
}
}