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/*
* This file is part of ltrace.
* Copyright (C) 2012 Petr Machata, Red Hat Inc.
*
* 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.
*
* 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.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA
* 02110-1301 USA
*/
#include <stdlib.h>
#include <assert.h>
#include <stdio.h>
#include <string.h>
#include "filter.h"
#include "library.h"
#include "callback.h"
void
filter_init(struct filter *filt)
{
filt->rules = NULL;
filt->next = NULL;
}
void
filter_destroy(struct filter *filt)
{
struct filter_rule *it;
for (it = filt->rules; it != NULL; ) {
struct filter_rule *next = it->next;
filter_rule_destroy(it);
it = next;
}
}
void
filter_rule_init(struct filter_rule *rule, enum filter_rule_type type,
struct filter_lib_matcher *matcher,
regex_t symbol_re)
{
rule->type = type;
rule->lib_matcher = matcher;
rule->symbol_re = symbol_re;
rule->next = NULL;
}
void
filter_rule_destroy(struct filter_rule *rule)
{
filter_lib_matcher_destroy(rule->lib_matcher);
regfree(&rule->symbol_re);
}
void
filter_add_rule(struct filter *filt, struct filter_rule *rule)
{
struct filter_rule **rulep;
for (rulep = &filt->rules; *rulep != NULL; rulep = &(*rulep)->next)
;
*rulep = rule;
}
void
filter_lib_matcher_name_init(struct filter_lib_matcher *matcher,
enum filter_lib_matcher_type type,
regex_t libname_re)
{
switch (type) {
case FLM_MAIN:
assert(type != type);
abort();
case FLM_SONAME:
case FLM_PATHNAME:
matcher->type = type;
matcher->libname_re = libname_re;
}
}
void
filter_lib_matcher_main_init(struct filter_lib_matcher *matcher)
{
matcher->type = FLM_MAIN;
}
void
filter_lib_matcher_destroy(struct filter_lib_matcher *matcher)
{
switch (matcher->type) {
case FLM_SONAME:
case FLM_PATHNAME:
regfree(&matcher->libname_re);
break;
case FLM_MAIN:
break;
}
}
static int
re_match_or_error(regex_t *re, const char *name, const char *what)
{
int status = regexec(re, name, 0, NULL, 0);
if (status == 0)
return 1;
if (status == REG_NOMATCH)
return 0;
char buf[200];
regerror(status, re, buf, sizeof buf);
fprintf(stderr, "Error when matching %s: %s\n", name, buf);
return 0;
}
static int
matcher_matches_library(struct filter_lib_matcher *matcher, struct library *lib)
{
switch (matcher->type) {
case FLM_SONAME:
return re_match_or_error(&matcher->libname_re, lib->soname,
"library soname");
case FLM_PATHNAME:
return re_match_or_error(&matcher->libname_re, lib->pathname,
"library pathname");
case FLM_MAIN:
return lib->type == LT_LIBTYPE_MAIN;
}
assert(matcher->type != matcher->type);
abort();
}
int
filter_matches_library(struct filter *filt, struct library *lib)
{
if (filt == NULL)
return 0;
for (; filt != NULL; filt = filt->next) {
struct filter_rule *it;
for (it = filt->rules; it != NULL; it = it->next)
switch (it->type) {
case FR_ADD:
if (matcher_matches_library(it->lib_matcher, lib))
return 1;
case FR_SUBTRACT:
continue;
};
}
return 0;
}
int
filter_matches_symbol(struct filter *filt,
const char *sym_name, struct library *lib)
{
for (; filt != NULL; filt = filt->next) {
int matches = 0;
struct filter_rule *it;
for (it = filt->rules; it != NULL; it = it->next) {
switch (it->type) {
case FR_ADD:
if (matches)
continue;
break;
case FR_SUBTRACT:
if (!matches)
continue;
}
if (matcher_matches_library(it->lib_matcher, lib)
&& re_match_or_error(&it->symbol_re, sym_name,
"symbol name"))
matches = !matches;
}
if (matches)
return 1;
}
return 0;
}
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