*
*/
-#include <stdlib.h>
-#include <unistd.h>
-#include <string.h>
-#include <errno.h>
+/*** MODULEINFO
+ <support_level>core</support_level>
+ ***/
#include "asterisk.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/config.h"
-#include "asterisk/options.h"
#include "asterisk/pbx.h"
#include "asterisk/module.h"
#include "asterisk/frame.h"
-#include "asterisk/file.h"
#include "asterisk/cli.h"
#include "asterisk/lock.h"
#include "asterisk/md5.h"
#include "asterisk/sched.h"
#include "asterisk/io.h"
#include "asterisk/utils.h"
-#include "asterisk/crypto.h"
#include "asterisk/astdb.h"
-static char *tdesc = "Loopback Switch";
-/* Loopback switch substitutes ${EXTEN}, ${CONTEXT}, and ${PRIORITY} into
- the data passed to it to try to get a string of the form:
+/* Loopback switch creates a 'tunnel' to another context. When extension
+ lookups pass through the 'tunnel', Asterisk expressions can be used
+ to modify the target extension, context, and priority in any way desired.
+ If there is a match at the far end, execution jumps through the 'tunnel'
+ to the matched context, extension, and priority.
+
+ Global variables as well as ${CONTEXT}, ${EXTEN}, and ${PRIORITY} are
+ available for substitution. After substitution Loopback expects to get
+ a string of the form:
[exten]@context[:priority][/extramatch]
Where exten, context, and priority are another extension, context, and priority
- to lookup and "extramatch" is an extra match restriction the *original* number
- must fit if specified. The "extramatch" begins with _ like an exten pattern
- if it is specified. Note that the search context MUST be a different context
- from the current context or the search will not succeed in an effort to reduce
- the likelihood of loops (they're still possible if you try hard, so be careful!)
+ to lookup and "extramatch" is a dialplan extension pattern which the *original*
+ number must match. If exten or priority are empty, the original values are
+ used.
+
+ Note that the search context MUST be a different context from the current
+ context or the search will not succeed. This is intended to reduce the
+ likelihood of loops (they're still possible if you try hard, so be careful!)
*/
char *newexten=(char *)exten, *newcontext=(char *)context; \
int newpriority=priority; \
char *newpattern=NULL; \
- loopback_helper(buf, sizeof(buf), exten, context, priority, data); \
- loopback_subst(&newexten, &newcontext, &newpriority, &newpattern, buf); \
- ast_log(LOG_DEBUG, "Parsed into %s @ %s priority %d\n", newexten, newcontext, newpriority); \
+ loopback_subst(buf, sizeof(buf), exten, context, priority, data); \
+ loopback_parse(&newexten, &newcontext, &newpriority, &newpattern, buf); \
+ ast_debug(1, "Parsed into %s @ %s priority %d\n", newexten, newcontext, newpriority); \
if (!strcasecmp(newcontext, context)) return -1
-
-static char *loopback_helper(char *buf, int buflen, const char *exten, const char *context, int priority, const char *data)
+static char *loopback_subst(char *buf, int buflen, const char *exten, const char *context, int priority, const char *data)
{
struct ast_var_t *newvariable;
struct varshead headp;
char tmp[80];
snprintf(tmp, sizeof(tmp), "%d", priority);
- memset(buf, 0, buflen);
AST_LIST_HEAD_INIT_NOLOCK(&headp);
- newvariable = ast_var_assign("EXTEN", exten);
- AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
- newvariable = ast_var_assign("CONTEXT", context);
- AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
- newvariable = ast_var_assign("PRIORITY", tmp);
- AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
- pbx_substitute_variables_varshead(&headp, data, buf, buflen);
- /* Substitute variables */
- while (!AST_LIST_EMPTY(&headp)) { /* List Deletion. */
- newvariable = AST_LIST_REMOVE_HEAD(&headp, entries);
- ast_var_delete(newvariable);
+ if ((newvariable = ast_var_assign("EXTEN", exten))) {
+ AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
+ }
+ if ((newvariable = ast_var_assign("CONTEXT", context))) {
+ AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
}
+ if ((newvariable = ast_var_assign("PRIORITY", tmp))) {
+ AST_LIST_INSERT_HEAD(&headp, newvariable, entries);
+ }
+ /* Substitute variables */
+ pbx_substitute_variables_varshead(&headp, data, buf, buflen);
+ /* free the list */
+ while ((newvariable = AST_LIST_REMOVE_HEAD(&headp, entries)))
+ ast_var_delete(newvariable);
return buf;
}
-static void loopback_subst(char **newexten, char **newcontext, int *priority, char **newpattern, char *buf)
+static void loopback_parse(char **newexten, char **newcontext, int *priority, char **newpattern, char *buf)
{
char *con;
char *pri;
*newpattern = strchr(buf, '/');
- if (*newpattern) {
- *(*newpattern) = '\0';
- (*newpattern)++;
- }
+ if (*newpattern)
+ *(*newpattern)++ = '\0';
con = strchr(buf, '@');
if (con) {
- *con = '\0';
- con++;
+ *con++ = '\0';
pri = strchr(con, ':');
} else
pri = strchr(buf, ':');
if (!ast_strlen_zero(con))
*newcontext = con;
if (!ast_strlen_zero(pri))
- sscanf(pri, "%d", priority);
+ sscanf(pri, "%30d", priority);
}
static int loopback_exists(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
return res;
}
-static int loopback_exec(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, int newstack, const char *data)
+static int loopback_exec(struct ast_channel *chan, const char *context, const char *exten, int priority, const char *callerid, const char *data)
{
+ int found;
LOOPBACK_COMMON;
- if (newstack)
- res = ast_spawn_extension(chan, newcontext, newexten, newpriority, callerid);
- else
- res = ast_exec_extension(chan, newcontext, newexten, newpriority, callerid);
- if (newpattern && !ast_extension_match(newpattern, exten))
- res = -1;
+ res = ast_spawn_extension(chan, newcontext, newexten, newpriority, callerid, &found, 0);
return res;
}
static struct ast_switch loopback_switch =
{
- name: "Loopback",
- description: "Loopback Dialplan Switch",
- exists: loopback_exists,
- canmatch: loopback_canmatch,
- exec: loopback_exec,
- matchmore: loopback_matchmore,
+ .name = "Loopback",
+ .description = "Loopback Dialplan Switch",
+ .exists = loopback_exists,
+ .canmatch = loopback_canmatch,
+ .exec = loopback_exec,
+ .matchmore = loopback_matchmore,
};
-char *description(void)
-{
- return tdesc;
-}
-
-int usecount(void)
-{
- return 1;
-}
-
-char *key()
-{
- return ASTERISK_GPL_KEY;
-}
-
-int unload_module(void)
+static int unload_module(void)
{
ast_unregister_switch(&loopback_switch);
return 0;
}
-int load_module(void)
+static int load_module(void)
{
- ast_register_switch(&loopback_switch);
- return 0;
+ if (ast_register_switch(&loopback_switch))
+ return AST_MODULE_LOAD_FAILURE;
+ return AST_MODULE_LOAD_SUCCESS;
}
+AST_MODULE_INFO_STANDARD(ASTERISK_GPL_KEY, "Loopback Switch");
projects / asterisk/asterisk.git / blobdiff