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freeswitch/src/switch_regex.c

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/*
* FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
* Copyright (C) 2005-2014, Anthony Minessale II <anthm@freeswitch.org>
*
* Version: MPL 1.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is FreeSWITCH Modular Media Switching Software Library / Soft-Switch Application
*
* The Initial Developer of the Original Code is
* Michael Jerris <mike@jerris.com>
* Portions created by the Initial Developer are Copyright (C)
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Michael Jerris <mike@jerris.com>
*
*
* switch_regex.c -- PCRE wrapper
*
*/
#include <switch.h>
#include <pcre.h>
SWITCH_DECLARE(switch_regex_t *) switch_regex_compile(const char *pattern,
int options, const char **errorptr, int *erroroffset, const unsigned char *tables)
{
return pcre_compile(pattern, options, errorptr, erroroffset, tables);
}
SWITCH_DECLARE(int) switch_regex_copy_substring(const char *subject, int *ovector, int stringcount, int stringnumber, char *buffer, int size)
{
return pcre_copy_substring(subject, ovector, stringcount, stringnumber, buffer, size);
}
SWITCH_DECLARE(void) switch_regex_free(void *data)
{
pcre_free(data);
}
SWITCH_DECLARE(int) switch_regex_perform(const char *field, const char *expression, switch_regex_t **new_re, int *ovector, uint32_t olen)
{
const char *error = NULL;
int erroffset = 0;
pcre *re = NULL;
int match_count = 0;
char *tmp = NULL;
uint32_t flags = 0;
char abuf[256] = "";
if (!(field && expression)) {
return 0;
}
if (*expression == '_') {
if (switch_ast2regex(expression + 1, abuf, sizeof(abuf))) {
expression = abuf;
}
}
if (*expression == '/') {
char *opts = NULL;
tmp = strdup(expression + 1);
assert(tmp);
if ((opts = strrchr(tmp, '/'))) {
*opts++ = '\0';
} else {
/* Note our error */
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
"Regular Expression Error expression[%s] missing ending '/' delimeter\n", expression);
goto end;
}
expression = tmp;
if (opts) {
if (strchr(opts, 'i')) {
flags |= PCRE_CASELESS;
}
if (strchr(opts, 's')) {
flags |= PCRE_DOTALL;
}
}
}
re = pcre_compile(expression, /* the pattern */
flags, /* default options */
&error, /* for error message */
&erroffset, /* for error offset */
NULL); /* use default character tables */
if (error) {
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR, "COMPILE ERROR: %d [%s][%s]\n", erroffset, error, expression);
switch_regex_safe_free(re);
goto end;
}
match_count = pcre_exec(re, /* result of pcre_compile() */
NULL, /* we didn't study the pattern */
field, /* the subject string */
(int) strlen(field), /* the length of the subject string */
0, /* start at offset 0 in the subject */
0, /* default options */
ovector, /* vector of integers for substring information */
olen); /* number of elements (NOT size in bytes) */
if (match_count <= 0) {
switch_regex_safe_free(re);
match_count = 0;
}
*new_re = (switch_regex_t *) re;
end:
switch_safe_free(tmp);
return match_count;
}
SWITCH_DECLARE(void) switch_perform_substitution(switch_regex_t *re, int match_count, const char *data, const char *field_data,
char *substituted, switch_size_t len, int *ovector)
{
char index[10] = "";
const char *replace = NULL;
switch_size_t x, y = 0, z = 0;
int num = 0;
int brace;
for (x = 0; y < (len - 1) && x < strlen(data);) {
if (data[x] == '$') {
x++;
brace = data[x] == '{';
if (brace) {
x++;
}
if (!(data[x] > 47 && data[x] < 58)) {
x -= brace;
substituted[y++] = data[x - 1];
continue;
}
while (data[x] > 47 && data[x] < 58 && z < sizeof(index) - 1) {
index[z++] = data[x];
x++;
}
if (brace) {
if (data[x] != '}') {
x -= z - 1;
substituted[y++] = data[x - 1];
continue;
}
else {
x++;
}
}
index[z++] = '\0';
z = 0;
num = atoi(index);
if (num < 0 || num > 256) {
num = -1;
}
if (pcre_get_substring(field_data, ovector, match_count, num, &replace) > 0) {
switch_size_t r;
for (r = 0; r < strlen(replace) && y < (len - 1); r++) {
substituted[y++] = replace[r];
}
pcre_free_substring(replace);
}
} else {
substituted[y++] = data[x];
x++;
}
}
substituted[y++] = '\0';
}
SWITCH_DECLARE(void) switch_capture_regex(switch_regex_t *re, int match_count, const char *field_data,
int *ovector, const char *var, switch_cap_callback_t callback, void *user_data)
{
const char *replace;
int i;
for (i = 0; i < match_count; i++) {
if (pcre_get_substring(field_data, ovector, match_count, i, &replace) > 0) {
callback(var, replace, user_data);
pcre_free_substring(replace);
}
}
}
SWITCH_DECLARE(switch_status_t) switch_regex_match_partial(const char *target, const char *expression, int *partial)
{
const char *error = NULL; /* Used to hold any errors */
int error_offset = 0; /* Holds the offset of an error */
pcre *pcre_prepared = NULL; /* Holds the compiled regex */
int match_count = 0; /* Number of times the regex was matched */
int offset_vectors[255]; /* not used, but has to exist or pcre won't even try to find a match */
int pcre_flags = 0;
uint32_t flags = 0;
char *tmp = NULL;
switch_status_t status = SWITCH_STATUS_FALSE;
if (*expression == '/') {
char *opts = NULL;
tmp = strdup(expression + 1);
assert(tmp);
if ((opts = strrchr(tmp, '/'))) {
*opts++ = '\0';
} else {
/* Note our error */
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
"Regular Expression Error expression[%s] missing ending '/' delimeter\n", expression);
goto end;
}
expression = tmp;
if (opts) {
if (strchr(opts, 'i')) {
flags |= PCRE_CASELESS;
}
if (strchr(opts, 's')) {
flags |= PCRE_DOTALL;
}
}
}
/* Compile the expression */
pcre_prepared = pcre_compile(expression, flags, &error, &error_offset, NULL);
/* See if there was an error in the expression */
if (error != NULL) {
/* Clean up after ourselves */
if (pcre_prepared) {
pcre_free(pcre_prepared);
pcre_prepared = NULL;
}
/* Note our error */
switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_ERROR,
"Regular Expression Error expression[%s] error[%s] location[%d]\n", expression, error, error_offset);
/* We definitely didn't match anything */
goto end;
}
if (*partial) {
pcre_flags = PCRE_PARTIAL;
}
/* So far so good, run the regex */
match_count =
pcre_exec(pcre_prepared, NULL, target, (int) strlen(target), 0, pcre_flags, offset_vectors, sizeof(offset_vectors) / sizeof(offset_vectors[0]));
/* Clean up */
if (pcre_prepared) {
pcre_free(pcre_prepared);
pcre_prepared = NULL;
}
/* switch_log_printf(SWITCH_CHANNEL_LOG, SWITCH_LOG_DEBUG, "number of matches: %d\n", match_count); */
/* Was it a match made in heaven? */
if (match_count > 0) {
*partial = 0;
switch_goto_status(SWITCH_STATUS_SUCCESS, end);
} else if (match_count == PCRE_ERROR_PARTIAL || match_count == PCRE_ERROR_BADPARTIAL) {
/* yes it is already set, but the code is clearer this way */
*partial = 1;
switch_goto_status(SWITCH_STATUS_SUCCESS, end);
} else {
goto end;
}
end:
switch_safe_free(tmp);
return status;
}
SWITCH_DECLARE(switch_status_t) switch_regex_match(const char *target, const char *expression)
{
int partial = 0;
return switch_regex_match_partial(target, expression, &partial);
}
SWITCH_DECLARE_NONSTD(void) switch_regex_set_var_callback(const char *var, const char *val, void *user_data)
{
switch_core_session_t *session = (switch_core_session_t *) user_data;
switch_channel_t *channel = switch_core_session_get_channel(session);
switch_channel_add_variable_var_check(channel, var, val, SWITCH_FALSE, SWITCH_STACK_PUSH);
}
SWITCH_DECLARE_NONSTD(void) switch_regex_set_event_header_callback(const char *var, const char *val, void *user_data)
{
switch_event_t *event = (switch_event_t *) user_data;
switch_event_add_header_string(event, SWITCH_STACK_BOTTOM, var, val);
}
/* For Emacs:
* Local Variables:
* mode:c
* indent-tabs-mode:t
* tab-width:4
* c-basic-offset:4
* End:
* For VIM:
* vim:set softtabstop=4 shiftwidth=4 tabstop=4 noet:
*/
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