Add features (incomplete, highly experimental), fix DundiLookup app, debug improvements (bug #2800)

git-svn-id: http://svn.digium.com/svn/asterisk/trunk@4167 f38db490-d61c-443f-a65b-d21fe96a405b

1 files changed, 520 insertions, 0 deletions

diff --git a/channels/chan_features.c b/channels/chan_features.c
new file mode 100755
index 000000000..7c823e786
--- /dev/null
+++ b/channels/chan_features.c
@@ -0,0 +1,520 @@
+/*
+ * Asterisk -- A telephony toolkit for Linux.
+ *
+ * feature 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 <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 = "Feature Proxy Channel";
+static char *type = "Feature";
+static char *tdesc = "Feature Proxy Channel Driver";
+
+static int capability = -1;
+
+static int usecnt =0;
+AST_MUTEX_DEFINE_STATIC(usecnt_lock);
+
+#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
+
+/* Protect the interface list (of feature_pvt's) */
+AST_MUTEX_DEFINE_STATIC(featurelock);
+
+struct feature_sub {
+	struct ast_channel *owner;
+	int inthreeway;
+	int pfd;
+};
+
+static struct feature_pvt {
+	ast_mutex_t lock;				/* Channel private lock */
+	char tech[AST_MAX_EXTENSION];	/* Technology to abstract */
+	char dest[AST_MAX_EXTENSION];	/* Destination to abstract */
+	struct ast_channel *subchan;
+	struct feature_sub subs[3];		/* Subs */
+	struct ast_channel *owner;			/* Current Master Channel */
+	struct feature_pvt *next;				/* Next entity */
+} *features = NULL;
+
+#define SUB_REAL		0			/* Active call */
+#define SUB_CALLWAIT	1			/* Call-Waiting call on hold */
+#define SUB_THREEWAY	2			/* Three-way call */
+
+static inline void init_sub(struct feature_sub *sub)
+{
+	sub->inthreeway = 0;
+	sub->pfd = -1;
+}
+
+static inline int indexof(struct feature_pvt *p, struct ast_channel *owner, int nullok)
+{
+	int x;
+	if (!owner) {
+		ast_log(LOG_WARNING, "indexof called on NULL owner??\n");
+		return -1;
+	}
+	for (x=0;x<3;x++) {
+		if (owner == p->subs[x].owner)
+			return x;
+	}
+	return -1;
+}
+
+static void wakeup_sub(struct feature_pvt *p, int a)
+{
+	struct ast_frame null = { AST_FRAME_NULL, };
+	for (;;) {
+		if (p->subs[a].owner) {
+			if (ast_mutex_trylock(&p->subs[a].owner->lock)) {
+				ast_mutex_unlock(&p->lock);
+				usleep(1);
+				ast_mutex_lock(&p->lock);
+			} else {
+				ast_queue_frame(p->subs[a].owner, &null);
+				ast_mutex_unlock(&p->subs[a].owner->lock);
+				break;
+			}
+		} else
+			break;
+	}
+}
+
+static void swap_subs(struct feature_pvt *p, int a, int b)
+{
+	int x;
+	int tinthreeway;
+	struct ast_channel *towner;
+
+	ast_log(LOG_DEBUG, "Swapping %d and %d\n", a, b);
+
+	towner = p->subs[a].owner;
+	tinthreeway = p->subs[a].inthreeway;
+
+	p->subs[a].owner = p->subs[b].owner;
+	p->subs[a].inthreeway = p->subs[b].inthreeway;
+
+	p->subs[b].owner = towner;
+	p->subs[b].inthreeway = tinthreeway;
+
+	if (p->subs[a].owner) {
+		for (x=0;x<AST_MAX_FDS;x++) {
+			if (a) 
+				p->subs[a].owner->fds[x] = -1;
+			else
+				p->subs[a].owner->fds[x] = p->subchan->fds[x];
+		}
+	}
+	if (p->subs[b].owner) {
+		for (x=0;x<AST_MAX_FDS;x++)
+			p->subs[b].owner->fds[x] = p->subchan->fds[x];
+	}
+	wakeup_sub(p, a);
+	wakeup_sub(p, b);
+}
+
+static int features_answer(struct ast_channel *ast)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	int x;
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan)
+		res = ast_answer(p->subchan);
+	ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static struct ast_frame  *features_read(struct ast_channel *ast)
+{
+	static struct ast_frame null_frame = { AST_FRAME_NULL, };
+	struct feature_pvt *p = ast->pvt->pvt;
+	struct ast_frame *f;
+	int x;
+	
+	f = &null_frame;
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan)
+		f = ast_read(p->subchan);
+	ast_mutex_unlock(&p->lock);
+	return f;
+}
+
+static int features_write(struct ast_channel *ast, struct ast_frame *f)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	int x;
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan)
+		res = ast_write(p->subchan, f);
+	ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int features_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
+{
+	struct feature_pvt *p = newchan->pvt->pvt;
+	int x;
+	ast_mutex_lock(&p->lock);
+	if (p->owner == oldchan)
+		p->owner = newchan;
+	for (x=0;x<3;x++) {
+		if (p->subs[x].owner == oldchan)
+			p->subs[x].owner = newchan;
+	}
+	ast_mutex_unlock(&p->lock);
+	return 0;
+}
+
+static int features_indicate(struct ast_channel *ast, int condition)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	int x;
+	/* Queue up a frame representing the indication as a control frame */
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan)
+		res = ast_indicate(p->subchan, condition);
+	ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int features_digit(struct ast_channel *ast, char digit)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	int x;
+	/* Queue up a frame representing the indication as a control frame */
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan)
+		res = ast_senddigit(p->subchan, digit);
+	ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int features_call(struct ast_channel *ast, char *dest, int timeout)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	int res = -1;
+	int x;
+		
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (!x && p->subchan) {
+		if (p->owner->cid.cid_num)
+			p->subchan->cid.cid_num = strdup(p->owner->cid.cid_num);
+		else 
+			p->subchan->cid.cid_num = NULL;
+	
+		if (p->owner->cid.cid_name)
+			p->subchan->cid.cid_name = strdup(p->owner->cid.cid_name);
+		else 
+			p->subchan->cid.cid_name = NULL;
+	
+		if (p->owner->cid.cid_rdnis)
+			p->subchan->cid.cid_rdnis = strdup(p->owner->cid.cid_rdnis);
+		else
+			p->subchan->cid.cid_rdnis = NULL;
+	
+		if (p->owner->cid.cid_ani)
+			p->subchan->cid.cid_ani = strdup(p->owner->cid.cid_ani);
+		else
+			p->subchan->cid.cid_ani = NULL;
+	
+		strncpy(p->subchan->language, p->owner->language, sizeof(p->subchan->language) - 1);
+		strncpy(p->subchan->accountcode, p->owner->accountcode, sizeof(p->subchan->accountcode) - 1);
+		p->subchan->cdrflags = p->owner->cdrflags;
+	} else
+		ast_log(LOG_NOTICE, "Uhm yah, not quite there with the call waiting...\n");
+	ast_mutex_unlock(&p->lock);
+	return res;
+}
+
+static int features_hangup(struct ast_channel *ast)
+{
+	struct feature_pvt *p = ast->pvt->pvt;
+	struct feature_pvt *cur, *prev=NULL;
+	int x;
+
+	ast_mutex_lock(&p->lock);
+	x = indexof(p, ast, 0);
+	if (x > -1) {
+		p->subs[x].owner = NULL;
+		/* XXX Re-arrange, unconference, etc XXX */
+	}
+	ast->pvt->pvt = NULL;
+	
+	
+	if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
+		ast_mutex_unlock(&p->lock);
+		/* Remove from list */
+		ast_mutex_lock(&featurelock);
+		cur = features;
+		while(cur) {
+			if (cur == p) {
+				if (prev)
+					prev->next = cur->next;
+				else
+					features = cur->next;
+				break;
+			}
+			prev = cur;
+			cur = cur->next;
+		}
+		ast_mutex_unlock(&featurelock);
+		ast_mutex_lock(&p->lock);
+		/* And destroy */
+		if (p->subchan)
+			ast_hangup(p->subchan);
+		ast_mutex_unlock(&p->lock);
+		ast_mutex_destroy(&p->lock);
+		free(p);
+		return 0;
+	}
+	ast_mutex_unlock(&p->lock);
+	return 0;
+}
+
+static struct feature_pvt *features_alloc(char *data, int format)
+{
+	struct feature_pvt *tmp;
+	char *dest=NULL;
+	char *tech;
+	int x;
+	int status;
+	struct ast_channel *chan;
+	
+	tech = ast_strdupa(data);
+	if (tech) {
+		dest = strchr(tech, '/');
+		if (dest) {
+			*dest = '\0';
+			dest++;
+		}
+	}
+	if (!tech || !dest) {
+		ast_log(LOG_NOTICE, "Format for feature channel is Feature/Tech/Dest ('%s' not valid)!\n", 
+			data);
+		return NULL;
+	}
+	ast_mutex_lock(&featurelock);
+	tmp = features;
+	while(tmp) {
+		if (!strcasecmp(tmp->tech, tech) && !strcmp(tmp->dest, dest))
+			break;
+		tmp = tmp->next;
+	}
+	ast_mutex_unlock(&featurelock);
+	if (!tmp) {
+		chan = ast_request(tech, format, dest, &status);
+		if (!chan) {
+			ast_log(LOG_NOTICE, "Unable to allocate subchannel '%s/%s'\n", tech, dest);
+			return NULL;
+		}
+		tmp = malloc(sizeof(struct feature_pvt));
+		if (tmp) {
+			memset(tmp, 0, sizeof(struct feature_pvt));
+			for (x=0;x<3;x++)
+				init_sub(tmp->subs + x);
+			ast_mutex_init(&tmp->lock);
+			strncpy(tmp->tech, tech, sizeof(tmp->tech) - 1);
+			strncpy(tmp->dest, dest, sizeof(tmp->dest) - 1);
+			tmp->subchan = chan;
+			ast_mutex_lock(&featurelock);
+			tmp->next = features;
+			features = tmp;
+			ast_mutex_unlock(&featurelock);
+		}
+	}
+	return tmp;
+}
+
+static struct ast_channel *features_new(struct feature_pvt *p, int state, int index)
+{
+	struct ast_channel *tmp;
+	int x,y;
+	if (!p->subchan) {
+		ast_log(LOG_WARNING, "Called upon channel with no subchan:(\n");
+		return NULL;
+	}
+	if (!p->subs[index].owner) {
+		ast_log(LOG_WARNING, "Called to put index %d already there!\n", index);
+		return NULL;
+	}
+	tmp = ast_channel_alloc(1);
+	if (!tmp)
+		return NULL;
+	if (tmp) {
+		for (x=1;x<4;x++) {
+			snprintf(tmp->name, sizeof(tmp->name), "Feature/%s/%s-%d", p->tech, p->dest, x);
+			for (y=0;y<3;y++) {
+				if (p->subs[x].owner && !strcasecmp(p->subs[x].owner->name, tmp->name))
+					break;
+			}
+			if (y < 3)
+				break;
+		}
+		tmp->type = type;
+		ast_setstate(tmp, state);
+		tmp->writeformat = p->subchan->writeformat;;
+		tmp->pvt->rawwriteformat = p->subchan->pvt->rawwriteformat;
+		tmp->readformat = p->subchan->readformat;
+		tmp->pvt->rawreadformat = p->subchan->pvt->rawreadformat;
+		tmp->pvt->pvt = p;
+		tmp->pvt->send_digit = features_digit;
+		tmp->pvt->call = features_call;
+		tmp->pvt->hangup = features_hangup;
+		tmp->pvt->answer = features_answer;
+		tmp->pvt->read = features_read;
+		tmp->pvt->write = features_write;
+		tmp->pvt->exception = features_read;
+		tmp->pvt->indicate = features_indicate;
+		tmp->pvt->fixup = features_fixup;
+		p->subs[index].owner = tmp;
+		ast_mutex_lock(&usecnt_lock);
+		usecnt++;
+		ast_mutex_unlock(&usecnt_lock);
+		ast_update_use_count();
+	} else
+		ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
+	return tmp;
+}
+
+
+static struct ast_channel *features_request(const char *type, int format, void *data, int *cause)
+{
+	struct feature_pvt *p;
+	struct ast_channel *chan = NULL;
+	p = features_alloc(data, format);
+	if (!p->subs[SUB_REAL].owner)
+		chan = features_new(p, AST_STATE_DOWN, SUB_REAL);
+	return chan;
+}
+
+static int features_show(int fd, int argc, char **argv)
+{
+	struct feature_pvt *p;
+
+	if (argc != 3)
+		return RESULT_SHOWUSAGE;
+	ast_mutex_lock(&featurelock);
+	p = features;
+	while(p) {
+		ast_mutex_lock(&p->lock);
+		ast_cli(fd, "%s -- %s/%s\n", p->owner ? p->owner->name : "<unowned>", p->tech, p->dest);
+		ast_mutex_unlock(&p->lock);
+		p = p->next;
+	}
+	if (!features)
+		ast_cli(fd, "No feature channels in use\n");
+	ast_mutex_unlock(&featurelock);
+	return RESULT_SUCCESS;
+}
+
+static char show_features_usage[] = 
+"Usage: feature show channels\n"
+"       Provides summary information on feature channels.\n";
+
+static struct ast_cli_entry cli_show_features = {
+	{ "feature", "show", "channels", NULL }, features_show, 
+	"Show status of feature channels", show_features_usage, NULL };
+
+int load_module()
+{
+	/* Make sure we can register our sip channel type */
+	if (ast_channel_register(type, tdesc, capability, features_request)) {
+		ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
+		return -1;
+	}
+	ast_cli_register(&cli_show_features);
+	return 0;
+}
+
+int reload()
+{
+	return 0;
+}
+
+int unload_module()
+{
+	struct feature_pvt *p;
+	/* First, take us out of the channel loop */
+	ast_cli_unregister(&cli_show_features);
+	ast_channel_unregister(type);
+	if (!ast_mutex_lock(&featurelock)) {
+		/* Hangup all interfaces if they have an owner */
+		p = features;
+		while(p) {
+			if (p->owner)
+				ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
+			p = p->next;
+		}
+		features = NULL;
+		ast_mutex_unlock(&featurelock);
+	} else {
+		ast_log(LOG_WARNING, "Unable to lock the monitor\n");
+		return -1;
+	}		
+	return 0;
+}
+
+int usecount()
+{
+	int res;
+	ast_mutex_lock(&usecnt_lock);
+	res = usecnt;
+	ast_mutex_unlock(&usecnt_lock);
+	return res;
+}
+
+char *key()
+{
+	return ASTERISK_GPL_KEY;
+}
+
+char *description()
+{
+	return desc;
+}
+