4c2d68c14b
This change introduces new filtering architecture primitives: filter, filter_action and bool_expression. Filtering is now done after decoding of syscall and tcp->qual_flg stores filtering results. * basic_actions.c: New file. * filter_action.c: Likewise. * filter_expression.c: Likewise. * filter.c: Likewise. * basic_filters.c (parse_syscall_filter, run_syscall_filter, free_syscall_filter): New functions. * defs.h (filter_syscall, filtering_parsing_finish): Add new declarations. * filter.h: Add new declarations. * filter_qualify.c (abbrev_set, raw_set, trace_set, verbose_set): Remove set variables. (qualify_trace, qualify_abbrev, qualify_verbose, qualify_raw): Use new filtering API. (qual_flags): Remove QUAL_* flags for trace, abbrev, verbose, raw. * strace.c (init): Call filtering_parse_finish after command line parsing. (trace_syscall): Add filtering after syscall decoding. * Makefile.am (strace_SOURCES): Add new files.
122 lines
3.6 KiB
C
122 lines
3.6 KiB
C
/*
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* Copyright (c) 2017 Nikolay Marchuk <marchuk.nikolay.a@gmail.com>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#include "defs.h"
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#include "filter.h"
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#define FILTER_TYPE(name) \
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{#name, parse_ ## name ## _filter, run_ ## name ## _filter, \
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free_ ## name ## _filter}
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/* End of FILTER_TYPE definition. */
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static const struct filter_type {
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const char *name;
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void *(*parse_filter)(const char *);
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bool (*run_filter)(struct tcb *, void *);
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void (*free_priv_data)(void *);
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} filter_types[] = {
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FILTER_TYPE(syscall),
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};
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#undef FILTER_TYPE
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struct filter {
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const struct filter_type *type;
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void *priv_data;
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};
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static const struct filter_type *
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lookup_filter_type(const char *str)
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{
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unsigned int i;
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for (i = 0; i < ARRAY_SIZE(filter_types); i++) {
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if (!strcmp(filter_types[i].name, str))
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return &filter_types[i];
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}
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return NULL;
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}
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struct filter *
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add_filter_to_array(struct filter **filters, unsigned int *nfilters,
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const char *name)
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{
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const struct filter_type *type = lookup_filter_type(name);
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struct filter *filter;
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if (!type)
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error_msg_and_die("invalid filter '%s'", name);
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*filters = xreallocarray(*filters, ++(*nfilters),
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sizeof(struct filter));
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filter = &((*filters)[*nfilters - 1]);
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filter->type = type;
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return filter;
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}
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void
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parse_filter(struct filter *filter, const char *str)
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{
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filter->priv_data = filter->type->parse_filter(str);
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}
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static bool
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run_filter(struct tcb *tcp, struct filter *filter)
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{
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return filter->type->run_filter(tcp, filter->priv_data);
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}
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void
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run_filters(struct tcb *tcp, struct filter *filters, unsigned int nfilters,
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bool *variables_buf)
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{
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unsigned int i;
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for (i = 0; i < nfilters; ++i)
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variables_buf[i] = run_filter(tcp, &filters[i]);
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}
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void
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free_filter(struct filter *filter)
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{
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if (!filter)
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return;
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filter->type->free_priv_data(filter->priv_data);
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}
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void
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set_filters_qualify_mode(struct filter **filters, unsigned int *nfilters,
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unsigned int filters_left)
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{
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unsigned int i;
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for (i = 0; i < *nfilters - filters_left; ++i)
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free_filter(*filters + i);
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for (i = 0; i < filters_left; ++i)
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(*filters)[i] = (*filters)[*nfilters - filters_left + i];
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*filters = xreallocarray(*filters, filters_left, sizeof(struct filter));
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*nfilters = filters_left;
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}
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