391 lines
12 KiB
C
391 lines
12 KiB
C
/*
|
|
* Asterisk -- An open source telephony toolkit.
|
|
*
|
|
* Copyright 2022, Naveen Albert <asterisk@phreaknet.org>
|
|
*
|
|
* Naveen Albert <asterisk@phreaknet.org>
|
|
*
|
|
* See http://www.asterisk.org for more information about
|
|
* the Asterisk project. Please do not directly contact
|
|
* any of the maintainers of this project for assistance;
|
|
* the project provides a web site, mailing lists and IRC
|
|
* channels for your use.
|
|
*
|
|
* This program is free software, distributed under the terms of
|
|
* the GNU General Public License Version 2. See the LICENSE file
|
|
* at the top of the source tree.
|
|
*/
|
|
|
|
/*! \file
|
|
*
|
|
* \brief If Branch Implementation
|
|
*
|
|
* \author Naveen Albert <asterisk@phreaknet.org>
|
|
*
|
|
* \ingroup applications
|
|
*/
|
|
|
|
/*** MODULEINFO
|
|
<support_level>extended</support_level>
|
|
***/
|
|
|
|
#include "asterisk.h"
|
|
|
|
#include "asterisk/pbx.h"
|
|
#include "asterisk/module.h"
|
|
#include "asterisk/channel.h"
|
|
|
|
/*** DOCUMENTATION
|
|
<application name="If" language="en_US">
|
|
<synopsis>
|
|
Start an if branch.
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="expr" required="true" />
|
|
</syntax>
|
|
<description>
|
|
<para>Start an If branch. Execution will continue inside the branch
|
|
if expr is true.</para>
|
|
<note><para>This application (and related applications) set variables
|
|
internally during execution.</para></note>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">ElseIf</ref>
|
|
<ref type="application">Else</ref>
|
|
<ref type="application">EndIf</ref>
|
|
<ref type="application">ExitIf</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="ElseIf" language="en_US">
|
|
<synopsis>
|
|
Start an else if branch.
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="expr" required="true" />
|
|
</syntax>
|
|
<description>
|
|
<para>Start an optional ElseIf branch. Execution will continue inside the branch
|
|
if expr is true and if previous If and ElseIf branches evaluated to false.</para>
|
|
<para>Please note that execution inside a true If branch will fallthrough into
|
|
ElseIf unless the If segment is terminated with an ExitIf call. This is only
|
|
necessary with ElseIf but not with Else.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">If</ref>
|
|
<ref type="application">Else</ref>
|
|
<ref type="application">EndIf</ref>
|
|
<ref type="application">ExitIf</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="Else" language="en_US">
|
|
<synopsis>
|
|
Define an optional else branch.
|
|
</synopsis>
|
|
<syntax>
|
|
<parameter name="expr" required="true" />
|
|
</syntax>
|
|
<description>
|
|
<para>Start an Else branch. Execution will jump here if all previous
|
|
If and ElseIf branches evaluated to false.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">If</ref>
|
|
<ref type="application">ElseIf</ref>
|
|
<ref type="application">EndIf</ref>
|
|
<ref type="application">ExitIf</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="EndIf" language="en_US">
|
|
<synopsis>
|
|
End an if branch.
|
|
</synopsis>
|
|
<syntax />
|
|
<description>
|
|
<para>Ends the branch begun by the preceding <literal>If()</literal> application.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">If</ref>
|
|
<ref type="application">ElseIf</ref>
|
|
<ref type="application">Else</ref>
|
|
<ref type="application">ExitIf</ref>
|
|
</see-also>
|
|
</application>
|
|
<application name="ExitIf" language="en_US">
|
|
<synopsis>
|
|
End an If branch.
|
|
</synopsis>
|
|
<syntax />
|
|
<description>
|
|
<para>Exits an <literal>If()</literal> branch, whether or not it has completed.</para>
|
|
</description>
|
|
<see-also>
|
|
<ref type="application">If</ref>
|
|
<ref type="application">ElseIf</ref>
|
|
<ref type="application">Else</ref>
|
|
<ref type="application">EndIf</ref>
|
|
</see-also>
|
|
</application>
|
|
***/
|
|
|
|
static char *if_app = "If";
|
|
static char *elseif_app = "ElseIf";
|
|
static char *else_app = "Else";
|
|
static char *stop_app = "EndIf";
|
|
static char *exit_app = "ExitIf";
|
|
|
|
#define VAR_SIZE 64
|
|
|
|
static const char *get_index(struct ast_channel *chan, const char *prefix, int idx)
|
|
{
|
|
char varname[VAR_SIZE];
|
|
|
|
snprintf(varname, VAR_SIZE, "%s_%d", prefix, idx);
|
|
return pbx_builtin_getvar_helper(chan, varname);
|
|
}
|
|
|
|
static struct ast_exten *find_matching_priority(struct ast_context *c, const char *exten, int priority, const char *callerid)
|
|
{
|
|
struct ast_exten *e;
|
|
struct ast_context *c2;
|
|
int idx;
|
|
|
|
for (e = ast_walk_context_extensions(c, NULL); e; e = ast_walk_context_extensions(c, e)) {
|
|
if (ast_extension_match(ast_get_extension_name(e), exten)) {
|
|
int needmatch = ast_get_extension_matchcid(e);
|
|
if ((needmatch && ast_extension_match(ast_get_extension_cidmatch(e), callerid)) ||
|
|
(!needmatch)) {
|
|
/* This is the matching extension we want */
|
|
struct ast_exten *p;
|
|
for (p = ast_walk_extension_priorities(e, NULL); p; p = ast_walk_extension_priorities(e, p)) {
|
|
if (priority != ast_get_extension_priority(p))
|
|
continue;
|
|
return p;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
/* No match; run through includes */
|
|
for (idx = 0; idx < ast_context_includes_count(c); idx++) {
|
|
const struct ast_include *i = ast_context_includes_get(c, idx);
|
|
|
|
for (c2 = ast_walk_contexts(NULL); c2; c2 = ast_walk_contexts(c2)) {
|
|
if (!strcmp(ast_get_context_name(c2), ast_get_include_name(i))) {
|
|
e = find_matching_priority(c2, exten, priority, callerid);
|
|
if (e)
|
|
return e;
|
|
}
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
static int find_matching_endif(struct ast_channel *chan, const char *otherapp)
|
|
{
|
|
struct ast_context *c;
|
|
int res = -1;
|
|
|
|
if (ast_rdlock_contexts()) {
|
|
ast_log(LOG_ERROR, "Failed to lock contexts list\n");
|
|
return -1;
|
|
}
|
|
|
|
for (c = ast_walk_contexts(NULL); c; c = ast_walk_contexts(c)) {
|
|
struct ast_exten *e;
|
|
|
|
if (!ast_rdlock_context(c)) {
|
|
if (!strcmp(ast_get_context_name(c), ast_channel_context(chan))) {
|
|
/* This is the matching context we want */
|
|
|
|
int cur_priority = ast_channel_priority(chan) + 1, level = 1;
|
|
|
|
for (e = find_matching_priority(c, ast_channel_exten(chan), cur_priority,
|
|
S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL));
|
|
e;
|
|
e = find_matching_priority(c, ast_channel_exten(chan), ++cur_priority,
|
|
S_COR(ast_channel_caller(chan)->id.number.valid, ast_channel_caller(chan)->id.number.str, NULL))) {
|
|
|
|
if (!strcasecmp(ast_get_extension_app(e), "IF")) {
|
|
level++;
|
|
} else if (!strcasecmp(ast_get_extension_app(e), "ENDIF")) {
|
|
level--;
|
|
}
|
|
|
|
if (!otherapp && level == 0) {
|
|
res = cur_priority;
|
|
break;
|
|
} else if (otherapp && level == 1 && !strcasecmp(ast_get_extension_app(e), otherapp)) {
|
|
res = cur_priority;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ast_unlock_context(c);
|
|
if (res > 0) {
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
ast_unlock_contexts();
|
|
return res;
|
|
}
|
|
|
|
static int if_helper(struct ast_channel *chan, const char *data, int end)
|
|
{
|
|
int res = 0;
|
|
const char *if_pri = NULL;
|
|
char *my_name = NULL;
|
|
const char *label = NULL;
|
|
char varname[VAR_SIZE + 3]; /* + IF_ */
|
|
char end_varname[sizeof(varname) + 4]; /* + END_ + sizeof(varname) */
|
|
const char *prefix = "IF";
|
|
size_t size = 0;
|
|
int used_index_i = -1, x = 0;
|
|
char used_index[VAR_SIZE] = "0", new_index[VAR_SIZE] = "0";
|
|
|
|
if (!chan) {
|
|
return -1;
|
|
}
|
|
|
|
for (x = 0 ;; x++) {
|
|
if (get_index(chan, prefix, x)) {
|
|
used_index_i = x;
|
|
} else {
|
|
break;
|
|
}
|
|
}
|
|
|
|
snprintf(used_index, sizeof(used_index), "%d", used_index_i);
|
|
snprintf(new_index, sizeof(new_index), "%d", used_index_i + 1);
|
|
|
|
size = strlen(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
|
|
my_name = ast_alloca(size);
|
|
memset(my_name, 0, size);
|
|
snprintf(my_name, size, "%s_%s_%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
|
|
|
|
ast_channel_lock(chan);
|
|
if (end > 1) {
|
|
label = used_index;
|
|
} else if (!(label = pbx_builtin_getvar_helper(chan, my_name))) {
|
|
label = new_index;
|
|
pbx_builtin_setvar_helper(chan, my_name, label);
|
|
}
|
|
snprintf(varname, sizeof(varname), "%s_%s", prefix, label);
|
|
if ((if_pri = pbx_builtin_getvar_helper(chan, varname)) && !end) {
|
|
if_pri = ast_strdupa(if_pri);
|
|
snprintf(end_varname,sizeof(end_varname),"END_%s",varname);
|
|
}
|
|
ast_channel_unlock(chan);
|
|
|
|
if ((end <= 1 && !pbx_checkcondition(ast_strdupa(data))) || (end > 1)) {
|
|
/* Condition Met (clean up helper vars) */
|
|
const char *goto_str;
|
|
int pri, endifpri;
|
|
pbx_builtin_setvar_helper(chan, varname, NULL);
|
|
pbx_builtin_setvar_helper(chan, my_name, NULL);
|
|
snprintf(end_varname,sizeof(end_varname),"END_%s",varname);
|
|
ast_channel_lock(chan);
|
|
/* For EndIf, simply go to the next priority.
|
|
* We do not add 1 to ast_channel_priority because the dialplan will
|
|
* auto-increment the priority when we return, so just keep the priority as is.
|
|
* For ExitIf or false If() condition, we need to find the end of the current
|
|
* If branch (at same indentation) and branch there. */
|
|
endifpri = end == 2 ? ast_channel_priority(chan) : find_matching_endif(chan, NULL);
|
|
if ((goto_str = pbx_builtin_getvar_helper(chan, end_varname))) {
|
|
ast_parseable_goto(chan, goto_str);
|
|
pbx_builtin_setvar_helper(chan, end_varname, NULL);
|
|
} else if (end <= 1 && (pri = find_matching_endif(chan, "ElseIf")) > 0 && pri < endifpri) {
|
|
pri--; /* back up a priority, since it returned the priority after the ElseIf */
|
|
/* If is false, and ElseIf exists, so jump to ElseIf */
|
|
ast_verb(3, "Taking conditional false branch, jumping to priority %d\n", pri);
|
|
ast_channel_priority_set(chan, pri);
|
|
} else if (end <= 1 && (pri = find_matching_endif(chan, "Else")) > 0 && pri < endifpri) {
|
|
/* don't need to back up a priority, because we don't actually need to execute Else, just jump to the priority after. Directly executing Else will exit the conditional. */
|
|
/* If is false, and Else exists, so jump to Else */
|
|
ast_verb(3, "Taking absolute false branch, jumping to priority %d\n", pri);
|
|
ast_channel_priority_set(chan, pri);
|
|
} else {
|
|
pri = endifpri;
|
|
if (pri > 0) {
|
|
ast_verb(3, "Exiting conditional, jumping to priority %d\n", pri);
|
|
ast_channel_priority_set(chan, pri);
|
|
} else if (end == 4) { /* Condition added because of end > 0 instead of end == 4 */
|
|
ast_log(LOG_WARNING, "Couldn't find matching EndIf? (If at %s@%s priority %d)\n", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
|
|
}
|
|
}
|
|
ast_channel_unlock(chan);
|
|
return res;
|
|
}
|
|
|
|
if (end <= 1 && !if_pri) {
|
|
char *goto_str;
|
|
size = strlen(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
|
|
goto_str = ast_alloca(size);
|
|
memset(goto_str, 0, size);
|
|
snprintf(goto_str, size, "%s,%s,%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan));
|
|
pbx_builtin_setvar_helper(chan, varname, goto_str);
|
|
} else if (end > 1 && if_pri) {
|
|
/* END of branch */
|
|
snprintf(end_varname, sizeof(end_varname), "END_%s", varname);
|
|
if (!pbx_builtin_getvar_helper(chan, end_varname)) {
|
|
char *goto_str;
|
|
size = strlen(ast_channel_context(chan)) + strlen(ast_channel_exten(chan)) + 32;
|
|
goto_str = ast_alloca(size);
|
|
memset(goto_str, 0, size);
|
|
snprintf(goto_str, size, "%s,%s,%d", ast_channel_context(chan), ast_channel_exten(chan), ast_channel_priority(chan)+1);
|
|
pbx_builtin_setvar_helper(chan, end_varname, goto_str);
|
|
}
|
|
ast_parseable_goto(chan, if_pri);
|
|
}
|
|
|
|
return res;
|
|
}
|
|
|
|
static int if_exec(struct ast_channel *chan, const char *data) {
|
|
return if_helper(chan, data, 0);
|
|
}
|
|
|
|
static int elseif_exec(struct ast_channel *chan, const char *data) {
|
|
return if_helper(chan, data, 1);
|
|
}
|
|
|
|
static int end_exec(struct ast_channel *chan, const char *data) {
|
|
return if_helper(chan, data, 2);
|
|
}
|
|
|
|
static int else_exec(struct ast_channel *chan, const char *data) {
|
|
return if_helper(chan, data, 3);
|
|
}
|
|
|
|
static int exit_exec(struct ast_channel *chan, const char *data) {
|
|
return if_helper(chan, data, 4);
|
|
}
|
|
|
|
static int unload_module(void)
|
|
{
|
|
int res;
|
|
|
|
res = ast_unregister_application(if_app);
|
|
res |= ast_unregister_application(elseif_app);
|
|
res |= ast_unregister_application(stop_app);
|
|
res |= ast_unregister_application(else_app);
|
|
res |= ast_unregister_application(exit_app);
|
|
|
|
return res;
|
|
}
|
|
|
|
static int load_module(void)
|
|
{
|
|
int res;
|
|
|
|
res = ast_register_application_xml(if_app, if_exec);
|
|
res |= ast_register_application_xml(elseif_app, elseif_exec);
|
|
res |= ast_register_application_xml(stop_app, end_exec);
|
|
res |= ast_register_application_xml(else_app, else_exec);
|
|
res |= ast_register_application_xml(exit_app, exit_exec);
|
|
|
|
return res;
|
|
}
|
|
|
|
AST_MODULE_INFO_STANDARD_EXTENDED(ASTERISK_GPL_KEY, "If Branch and Conditional Execution");
|