2de045936f
* basic_filters.c (lookup_class, qualify_syscall_class, qualify_syscall, qualify_syscall_tokens, parse_syscall_filter, qualify_tokens, parse_fd_filter, parse_path_filter): Add qualify_mode argument. (qualify_tokens, qualify_syscall_tokens): Use set inversion only in qualify mode. (lookup_class): Use deprecated class names only in qualify mode. * defs.h (qualify): Remove declaration. (filtering_parse): Add new declaration. * filter.c (struct filter_type, parse_filter): Add bool argument to parse_*_filter declarations. * filter.h (parse_filter_action, parse_qualify_action, parse_filter_expression): Add new declarations. (parse_filter, qualify_tokens, qualify_syscall_tokens): Add qualify_mode argument. (DECL_FILTER): Add bool argument to parse_*_filter declarations. * filter_action.c (parse_filter_action): Add new parsing function. (inject_path_tracing): Use filtering_parse instead of qualify. * filter_expression.c (parse_filter_expression): Implement parsing of filter expression. (parse_operator, push_operator, is_higher_priority): Add helper functions. (is_space_ascii, is_allowed_in_name): Add new declarations. * filter_parse.c: New file. * filter_qualify.c (qualify_read, qualify_write, qualify_signals, qualify_trace, qualify_abbrev, qualify_verbose, qualify_raw, qualify_inject_common, qualify_fault, qualify_inject): Use main_part and args arguments. * strace.c (init): Use filtering_parse instead of qualify. * Makefile.am (strace_SOURCES): Add filter_parse.c.
131 lines
3.7 KiB
C
131 lines
3.7 KiB
C
/*
|
|
* Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
|
|
* All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. The name of the author may not be used to endorse or promote products
|
|
* derived from this software without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
|
|
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
|
|
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
|
|
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
|
|
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
|
|
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
|
|
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
|
|
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
|
|
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
|
|
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
|
|
*/
|
|
|
|
#include "defs.h"
|
|
#include "filter.h"
|
|
|
|
#define FILTER_TYPE(name) \
|
|
{#name, parse_ ## name ## _filter, run_ ## name ## _filter, \
|
|
free_ ## name ## _filter}
|
|
/* End of FILTER_TYPE definition. */
|
|
|
|
static const struct filter_type {
|
|
const char *name;
|
|
void *(*parse_filter)(const char *, bool);
|
|
bool (*run_filter)(struct tcb *, void *);
|
|
void (*free_priv_data)(void *);
|
|
} filter_types[] = {
|
|
FILTER_TYPE(syscall),
|
|
FILTER_TYPE(fd),
|
|
FILTER_TYPE(path),
|
|
};
|
|
#undef FILTER_TYPE
|
|
|
|
struct filter {
|
|
const struct filter_type *type;
|
|
void *priv_data;
|
|
};
|
|
|
|
static const struct filter_type *
|
|
lookup_filter_type(const char *str)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < ARRAY_SIZE(filter_types); i++) {
|
|
if (!strcmp(filter_types[i].name, str))
|
|
return &filter_types[i];
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
struct filter *
|
|
add_filter_to_array(struct filter **filters, unsigned int *nfilters,
|
|
const char *name)
|
|
{
|
|
const struct filter_type *type = lookup_filter_type(name);
|
|
struct filter *filter;
|
|
|
|
if (!type)
|
|
error_msg_and_die("invalid filter '%s'", name);
|
|
*filters = xreallocarray(*filters, ++(*nfilters),
|
|
sizeof(struct filter));
|
|
filter = &((*filters)[*nfilters - 1]);
|
|
filter->type = type;
|
|
return filter;
|
|
}
|
|
|
|
void
|
|
parse_filter(struct filter *filter, const char *str, bool qualify_mode)
|
|
{
|
|
filter->priv_data = filter->type->parse_filter(str, qualify_mode);
|
|
}
|
|
|
|
static bool
|
|
run_filter(struct tcb *tcp, struct filter *filter)
|
|
{
|
|
return filter->type->run_filter(tcp, filter->priv_data);
|
|
}
|
|
|
|
void
|
|
run_filters(struct tcb *tcp, struct filter *filters, unsigned int nfilters,
|
|
bool *variables_buf)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < nfilters; ++i)
|
|
variables_buf[i] = run_filter(tcp, &filters[i]);
|
|
}
|
|
|
|
void
|
|
free_filter(struct filter *filter)
|
|
{
|
|
if (!filter)
|
|
return;
|
|
filter->type->free_priv_data(filter->priv_data);
|
|
}
|
|
|
|
void
|
|
set_filters_qualify_mode(struct filter **filters, unsigned int *nfilters,
|
|
unsigned int filters_left)
|
|
{
|
|
unsigned int i;
|
|
|
|
for (i = 0; i < *nfilters - filters_left; ++i)
|
|
free_filter(*filters + i);
|
|
for (i = 0; i < filters_left; ++i)
|
|
(*filters)[i] = (*filters)[*nfilters - filters_left + i];
|
|
*filters = xreallocarray(*filters, filters_left, sizeof(struct filter));
|
|
*nfilters = filters_left;
|
|
}
|
|
|
|
void
|
|
set_filter_priv_data(struct filter *filter, void *priv_data)
|
|
{
|
|
if (filter)
|
|
filter->priv_data = priv_data;
|
|
}
|