Add preliminary chan_local, fix chan_sip to delete unknown calls

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@750 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 409 insertions, 0 deletions

diff --git a/channels/chan_local.c b/channels/chan_local.c
new file mode 100755
index 000000000..ddad32ae4
--- /dev/null
+++ b/channels/chan_local.c
@@ -0,0 +1,409 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * Local Proxy Channel
+ * 
+ * Copyright (C) 1999, Mark Spencer
+ *
+ * Mark Spencer <markster@linux-support.net>
+ *
+ * This program is free software, distributed under the terms of
+ * the GNU General Public License
+ */
+
+#include <stdio.h>
+#include <pthread.h>
+#include <string.h>
+#include <asterisk/lock.h>
+#include <asterisk/channel.h>
+#include <asterisk/channel_pvt.h>
+#include <asterisk/config.h>
+#include <asterisk/logger.h>
+#include <asterisk/module.h>
+#include <asterisk/pbx.h>
+#include <asterisk/options.h>
+#include <asterisk/lock.h>
+#include <asterisk/sched.h>
+#include <asterisk/io.h>
+#include <asterisk/rtp.h>
+#include <asterisk/acl.h>
+#include <asterisk/callerid.h>
+#include <asterisk/file.h>
+#include <asterisk/cli.h>
+#include <asterisk/app.h>
+#include <asterisk/musiconhold.h>
+#include <asterisk/manager.h>
+#include <sys/socket.h>
+#include <errno.h>
+#include <unistd.h>
+#include <stdlib.h>
+#include <fcntl.h>
+#include <netdb.h>
+#include <arpa/inet.h>
+#include <sys/signal.h>
+
+static char *desc = "Local Proxy Channel";
+static char *type = "Local";
+static char *tdesc = "Local Proxy Channel Driver";
+
+static int capability = -1;
+
+static int usecnt =0;
+static pthread_mutex_t usecnt_lock = AST_MUTEX_INITIALIZER;
+
+#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
+
+/* Protect the interface list (of sip_pvt's) */
+static pthread_mutex_t locallock = AST_MUTEX_INITIALIZER;
+
+static struct local_pvt {
+	pthread_mutex_t lock;				/* Channel private lock */
+	char context[AST_MAX_EXTENSION];	/* Context to call */
+	char exten[AST_MAX_EXTENSION];		/* Extension to call */
+	int reqformat;						/* Requested format */
+	struct ast_channel *owner;			/* Master Channel */
+	struct ast_channel *chan;			/* Outbound channel */
+	struct local_pvt *next;				/* Next entity */
+} *locals = NULL;
+
+static int local_queue_frame(struct local_pvt *p, int isoutbound, struct ast_frame *f)
+{
+	struct ast_channel *other;
+	if (isoutbound)
+		other = p->owner;
+	else
+		other = p->chan;
+	if (!other)
+		return 0;
+retrylock:		
+	if (pthread_mutex_trylock(&other->lock)) {
+		/* Failed to lock.  Release main lock and try again */
+		ast_pthread_mutex_unlock(&p->lock);
+		/* Wait just a bit */
+		usleep(1);
+		ast_pthread_mutex_lock(&p->lock);
+		goto retrylock;
+	}
+	ast_queue_frame(other, f, 0);
+	ast_pthread_mutex_unlock(&other->lock);
+	return 0;
+}
+
+static int local_answer(struct ast_channel *ast)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	int isoutbound = IS_OUTBOUND(ast, p);
+	int res = -1;
+	ast_pthread_mutex_lock(&p->lock);
+	if (isoutbound) {
+		/* Pass along answer since somebody answered us */
+		struct ast_frame answer = { AST_FRAME_CONTROL, AST_CONTROL_ANSWER };
+		local_queue_frame(p, isoutbound, &answer);
+	} else
+		ast_log(LOG_WARNING, "Huh?  Local is being asked to answer?\n");
+	ast_pthread_mutex_unlock(&p->lock);
+	return res;
+}
+
+static struct ast_frame  *local_read(struct ast_channel *ast)
+{
+	static struct ast_frame null = { AST_FRAME_NULL, };
+	return &null;
+}
+
+static int local_write(struct ast_channel *ast, struct ast_frame *f)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	ast_pthread_mutex_lock(&p->lock);
+	int isoutbound = IS_OUTBOUND(ast, p);
+
+	/* Just queue for delivery to the other side */
+	ast_pthread_mutex_lock(&p->lock);
+	res = local_queue_frame(p, isoutbound, f);
+	ast_pthread_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int local_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
+{
+	struct local_pvt *p = newchan->pvt->pvt;
+	ast_pthread_mutex_lock(&p->lock);
+	if ((p->owner != oldchan) && (p->chan != oldchan)) {
+		ast_log(LOG_WARNING, "old channel wasn't %p but was %p/%p\n", oldchan, p->owner, p->chan);
+		ast_pthread_mutex_unlock(&p->lock);
+		return -1;
+	}
+	if (p->owner == oldchan)
+		p->owner = newchan;
+	else
+		p->chan = newchan;	
+	ast_pthread_mutex_unlock(&p->lock);
+	return 0;
+}
+
+static int local_indicate(struct ast_channel *ast, int condition)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	struct ast_frame f = { AST_FRAME_CONTROL, };
+	int isoutbound = IS_OUTBOUND(ast, p);
+	/* Queue up a frame representing the indication as a control frame */
+	ast_pthread_mutex_lock(&p->lock);
+	f.subclass = condition;
+	res = local_queue_frame(p, isoutbound, &f);
+	ast_pthread_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int local_digit(struct ast_channel *ast, char digit)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	struct ast_frame f = { AST_FRAME_DTMF, };
+	int isoutbound = IS_OUTBOUND(ast, p);
+	ast_pthread_mutex_lock(&p->lock);
+	f.subclass = digit;
+	res = local_queue_frame(p, isoutbound, &f);
+	ast_pthread_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int local_call(struct ast_channel *ast, char *dest, int timeout)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	/* Start switch on sub channel */
+	return ast_pbx_start(p->chan);
+}
+
+static void local_destroy(struct local_pvt *p)
+{
+	struct local_pvt *cur, *prev = NULL;
+	ast_pthread_mutex_lock(&locallock);
+	cur = locals;
+	while(cur) {
+		if (cur == p) {
+			if (prev)
+				prev->next = cur->next;
+			else
+				locals = cur->next;
+			free(cur);
+			break;
+		}
+		prev = cur;
+		cur = cur->next;
+	}
+	ast_pthread_mutex_unlock(&locallock);
+	if (!cur)
+		ast_log(LOG_WARNING, "Unable ot find local '%s@%s' in local list\n", p->exten, p->context);
+}
+
+static int local_hangup(struct ast_channel *ast)
+{
+	struct local_pvt *p = ast->pvt->pvt;
+	int isoutbound = IS_OUTBOUND(ast, p);
+	struct ast_frame f = { AST_FRAME_CONTROL, AST_CONTROL_HANGUP };
+	ast_pthread_mutex_lock(&p->lock);
+	if (isoutbound)
+		p->chan = NULL;
+	else
+		p->owner = NULL;
+	ast->pvt->pvt = NULL;
+	if (!p->owner && !p->chan) {
+		/* Okay, done with the private part now, too. */
+		ast_pthread_mutex_unlock(&p->lock);
+		free(p);
+		return 0;
+	}
+	local_queue_frame(p, isoutbound, &f);
+	ast_pthread_mutex_unlock(&p->lock);
+	return 0;
+}
+
+static struct local_pvt *local_alloc(char *data, int format)
+{
+	struct local_pvt *tmp;
+	char *c;
+	tmp = malloc(sizeof(struct local_pvt));
+	if (tmp) {
+		memset(tmp, 0, sizeof(struct local_pvt));
+		ast_pthread_mutex_init(&tmp->lock);
+		strncpy(tmp->exten, data, sizeof(tmp->exten) - 1);
+		c = strchr(tmp->exten, '@');
+		if (c) {
+			*c = '\0';
+			c++;
+			strncpy(tmp->context, data, sizeof(tmp->context) - 1);
+		}
+		tmp->reqformat = format;
+		/* Add to list */
+		ast_pthread_mutex_lock(&locallock);
+		tmp->next = locals;
+		locals = tmp;
+		ast_pthread_mutex_unlock(&locallock);
+		
+	}
+	return tmp;
+}
+
+static struct ast_channel *local_new(struct local_pvt *p, int state)
+{
+	struct ast_channel *tmp, *tmp2;
+	tmp = ast_channel_alloc(1);
+	tmp2 = ast_channel_alloc(1);
+	if (!tmp || !tmp2) {
+		if (tmp)
+			ast_channel_free(tmp);
+		if (tmp2)
+			ast_channel_free(tmp2);
+		tmp = NULL;
+	}
+	if (tmp) {
+		tmp->nativeformats = p->reqformat;
+		tmp->nativeformats = p->reqformat;
+		snprintf(tmp->name, sizeof(tmp->name), "Local/%s@%s-1", p->exten, p->context);
+		snprintf(tmp2->name, sizeof(tmp2->name), "Local/%s@%s-2", p->exten, p->context);
+		tmp->type = type;
+		tmp2->type = type;
+		ast_setstate(tmp, state);
+		ast_setstate(tmp2, AST_STATE_RING);
+		tmp->writeformat = p->reqformat;;
+		tmp2->writeformat = p->reqformat;
+		tmp->pvt->rawwriteformat = p->reqformat;
+		tmp2->pvt->rawwriteformat = p->reqformat;
+		tmp->readformat = p->reqformat;
+		tmp2->readformat = p->reqformat;
+		tmp->pvt->rawreadformat = p->reqformat;
+		tmp2->pvt->rawreadformat = p->reqformat;
+		tmp->pvt->pvt = p;
+		tmp2->pvt->pvt = p;
+		tmp->pvt->send_digit = local_digit;
+		tmp2->pvt->send_digit = local_digit;
+		tmp->pvt->call = local_call;
+		tmp2->pvt->call = local_call;
+		tmp->pvt->hangup = local_hangup;
+		tmp2->pvt->hangup = local_hangup;
+		tmp->pvt->answer = local_answer;
+		tmp2->pvt->answer = local_answer;
+		tmp->pvt->read = local_read;
+		tmp2->pvt->read = local_read;
+		tmp->pvt->write = local_write;
+		tmp2->pvt->write = local_write;
+		tmp->pvt->exception = local_read;
+		tmp2->pvt->exception = local_read;
+		tmp->pvt->indicate = local_indicate;
+		tmp2->pvt->indicate = local_indicate;
+		tmp->pvt->fixup = local_fixup;
+		tmp2->pvt->fixup = local_fixup;
+		p->owner = tmp;
+		p->chan = tmp2;
+		ast_pthread_mutex_lock(&usecnt_lock);
+		usecnt++;
+		ast_pthread_mutex_unlock(&usecnt_lock);
+		ast_update_use_count();
+		strncpy(tmp->context, p->context, sizeof(tmp->context)-1);
+		strncpy(tmp2->context, p->context, sizeof(tmp2->context)-1);
+		strncpy(tmp2->exten, p->exten, sizeof(tmp->exten)-1);
+		tmp->priority = 1;
+		tmp2->priority = 1;
+	} else
+		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
+	return tmp;
+}
+
+
+static struct ast_channel *local_request(char *type, int format, void *data)
+{
+	struct local_pvt *p;
+	struct ast_channel *chan = NULL;
+	p = local_alloc(data, format);
+	chan = local_new(p, AST_STATE_DOWN);
+	return chan;
+}
+
+static int locals_show(int fd, int argc, char **argv)
+{
+	struct local_pvt *p;
+
+	if (argc != 2)
+		return RESULT_SHOWUSAGE;
+	ast_pthread_mutex_lock(&locallock);
+	p = locals;
+	while(p) {
+		ast_pthread_mutex_lock(&p->lock);
+		ast_cli(fd, "%s -- %s@%s\n", p->owner ? p->owner->name : "<unowned>", p->exten, p->context);
+		ast_pthread_mutex_unlock(&p->lock);
+		p = p->next;
+	}
+	if (!locals)
+		ast_cli(fd, "No local channels in use\n");
+	ast_pthread_mutex_unlock(&locallock);
+	return RESULT_SUCCESS;
+}
+
+static char show_locals_usage[] = 
+"Usage: show locals\n"
+"       Provides summary information on locals.\n";
+
+static struct ast_cli_entry cli_show_locals = {
+	{ "show", "locals", NULL }, locals_show, 
+	"Show status of local channels", show_locals_usage, NULL };
+
+int load_module()
+{
+	/* Make sure we can register our sip channel type */
+	if (ast_channel_register(type, tdesc, capability, local_request)) {
+		ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
+		return -1;
+	}
+	ast_cli_register(&cli_show_locals);
+	return 0;
+}
+
+int reload()
+{
+	return 0;
+}
+
+int unload_module()
+{
+	struct local_pvt *p;
+	/* First, take us out of the channel loop */
+	ast_cli_unregister(&cli_show_locals);
+	ast_channel_unregister(type);
+	if (!ast_pthread_mutex_lock(&locallock)) {
+		/* Hangup all interfaces if they have an owner */
+		p = locals;
+		while(p) {
+			if (p->owner)
+				ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
+			p = p->next;
+		}
+		locals = NULL;
+		ast_pthread_mutex_unlock(&locallock);
+	} else {
+		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+		return -1;
+	}		
+	return 0;
+}
+
+int usecount()
+{
+	int res;
+	ast_pthread_mutex_lock(&usecnt_lock);
+	res = usecnt;
+	ast_pthread_mutex_unlock(&usecnt_lock);
+	return res;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}
+
+char *description()
+{
+	return desc;
+}
+