521 lines
12 KiB
C
Executable File
521 lines
12 KiB
C
Executable File
/*
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* Asterisk -- A telephony toolkit for Linux.
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*
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* feature Proxy Channel
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*
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* Copyright (C) 1999, Mark Spencer
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*
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* Mark Spencer <markster@linux-support.net>
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*
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* This program is free software, distributed under the terms of
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* the GNU General Public License
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*/
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#include <stdio.h>
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#include <string.h>
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#include <asterisk/lock.h>
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#include <asterisk/channel.h>
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#include <asterisk/channel_pvt.h>
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#include <asterisk/config.h>
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#include <asterisk/logger.h>
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#include <asterisk/module.h>
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#include <asterisk/pbx.h>
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#include <asterisk/options.h>
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#include <asterisk/lock.h>
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#include <asterisk/sched.h>
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#include <asterisk/io.h>
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#include <asterisk/rtp.h>
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#include <asterisk/acl.h>
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#include <asterisk/callerid.h>
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#include <asterisk/file.h>
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#include <asterisk/cli.h>
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#include <asterisk/app.h>
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#include <asterisk/musiconhold.h>
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#include <asterisk/manager.h>
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#include <sys/socket.h>
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#include <errno.h>
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#include <unistd.h>
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#include <stdlib.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <arpa/inet.h>
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#include <sys/signal.h>
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static char *desc = "Feature Proxy Channel";
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static char *type = "Feature";
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static char *tdesc = "Feature Proxy Channel Driver";
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static int capability = -1;
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static int usecnt =0;
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AST_MUTEX_DEFINE_STATIC(usecnt_lock);
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#define IS_OUTBOUND(a,b) (a == b->chan ? 1 : 0)
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/* Protect the interface list (of feature_pvt's) */
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AST_MUTEX_DEFINE_STATIC(featurelock);
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struct feature_sub {
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struct ast_channel *owner;
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int inthreeway;
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int pfd;
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};
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static struct feature_pvt {
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ast_mutex_t lock; /* Channel private lock */
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char tech[AST_MAX_EXTENSION]; /* Technology to abstract */
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char dest[AST_MAX_EXTENSION]; /* Destination to abstract */
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struct ast_channel *subchan;
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struct feature_sub subs[3]; /* Subs */
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struct ast_channel *owner; /* Current Master Channel */
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struct feature_pvt *next; /* Next entity */
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} *features = NULL;
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#define SUB_REAL 0 /* Active call */
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#define SUB_CALLWAIT 1 /* Call-Waiting call on hold */
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#define SUB_THREEWAY 2 /* Three-way call */
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static inline void init_sub(struct feature_sub *sub)
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{
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sub->inthreeway = 0;
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sub->pfd = -1;
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}
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static inline int indexof(struct feature_pvt *p, struct ast_channel *owner, int nullok)
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{
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int x;
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if (!owner) {
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ast_log(LOG_WARNING, "indexof called on NULL owner??\n");
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return -1;
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}
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for (x=0;x<3;x++) {
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if (owner == p->subs[x].owner)
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return x;
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}
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return -1;
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}
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static void wakeup_sub(struct feature_pvt *p, int a)
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{
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struct ast_frame null = { AST_FRAME_NULL, };
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for (;;) {
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if (p->subs[a].owner) {
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if (ast_mutex_trylock(&p->subs[a].owner->lock)) {
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ast_mutex_unlock(&p->lock);
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usleep(1);
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ast_mutex_lock(&p->lock);
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} else {
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ast_queue_frame(p->subs[a].owner, &null);
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ast_mutex_unlock(&p->subs[a].owner->lock);
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break;
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}
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} else
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break;
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}
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}
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static void swap_subs(struct feature_pvt *p, int a, int b)
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{
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int x;
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int tinthreeway;
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struct ast_channel *towner;
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ast_log(LOG_DEBUG, "Swapping %d and %d\n", a, b);
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towner = p->subs[a].owner;
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tinthreeway = p->subs[a].inthreeway;
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p->subs[a].owner = p->subs[b].owner;
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p->subs[a].inthreeway = p->subs[b].inthreeway;
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p->subs[b].owner = towner;
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p->subs[b].inthreeway = tinthreeway;
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if (p->subs[a].owner) {
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for (x=0;x<AST_MAX_FDS;x++) {
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if (a)
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p->subs[a].owner->fds[x] = -1;
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else
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p->subs[a].owner->fds[x] = p->subchan->fds[x];
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}
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}
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if (p->subs[b].owner) {
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for (x=0;x<AST_MAX_FDS;x++)
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p->subs[b].owner->fds[x] = p->subchan->fds[x];
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}
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wakeup_sub(p, a);
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wakeup_sub(p, b);
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}
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static int features_answer(struct ast_channel *ast)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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int res = -1;
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int x;
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan)
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res = ast_answer(p->subchan);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static struct ast_frame *features_read(struct ast_channel *ast)
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{
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static struct ast_frame null_frame = { AST_FRAME_NULL, };
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struct feature_pvt *p = ast->pvt->pvt;
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struct ast_frame *f;
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int x;
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f = &null_frame;
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan)
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f = ast_read(p->subchan);
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ast_mutex_unlock(&p->lock);
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return f;
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}
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static int features_write(struct ast_channel *ast, struct ast_frame *f)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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int res = -1;
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int x;
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan)
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res = ast_write(p->subchan, f);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int features_fixup(struct ast_channel *oldchan, struct ast_channel *newchan)
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{
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struct feature_pvt *p = newchan->pvt->pvt;
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int x;
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ast_mutex_lock(&p->lock);
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if (p->owner == oldchan)
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p->owner = newchan;
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for (x=0;x<3;x++) {
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if (p->subs[x].owner == oldchan)
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p->subs[x].owner = newchan;
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}
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ast_mutex_unlock(&p->lock);
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return 0;
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}
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static int features_indicate(struct ast_channel *ast, int condition)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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int res = -1;
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int x;
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/* Queue up a frame representing the indication as a control frame */
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan)
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res = ast_indicate(p->subchan, condition);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int features_digit(struct ast_channel *ast, char digit)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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int res = -1;
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int x;
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/* Queue up a frame representing the indication as a control frame */
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan)
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res = ast_senddigit(p->subchan, digit);
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int features_call(struct ast_channel *ast, char *dest, int timeout)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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int res = -1;
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int x;
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (!x && p->subchan) {
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if (p->owner->cid.cid_num)
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p->subchan->cid.cid_num = strdup(p->owner->cid.cid_num);
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else
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p->subchan->cid.cid_num = NULL;
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if (p->owner->cid.cid_name)
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p->subchan->cid.cid_name = strdup(p->owner->cid.cid_name);
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else
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p->subchan->cid.cid_name = NULL;
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if (p->owner->cid.cid_rdnis)
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p->subchan->cid.cid_rdnis = strdup(p->owner->cid.cid_rdnis);
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else
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p->subchan->cid.cid_rdnis = NULL;
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if (p->owner->cid.cid_ani)
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p->subchan->cid.cid_ani = strdup(p->owner->cid.cid_ani);
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else
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p->subchan->cid.cid_ani = NULL;
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strncpy(p->subchan->language, p->owner->language, sizeof(p->subchan->language) - 1);
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strncpy(p->subchan->accountcode, p->owner->accountcode, sizeof(p->subchan->accountcode) - 1);
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p->subchan->cdrflags = p->owner->cdrflags;
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} else
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ast_log(LOG_NOTICE, "Uhm yah, not quite there with the call waiting...\n");
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ast_mutex_unlock(&p->lock);
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return res;
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}
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static int features_hangup(struct ast_channel *ast)
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{
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struct feature_pvt *p = ast->pvt->pvt;
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struct feature_pvt *cur, *prev=NULL;
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int x;
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ast_mutex_lock(&p->lock);
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x = indexof(p, ast, 0);
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if (x > -1) {
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p->subs[x].owner = NULL;
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/* XXX Re-arrange, unconference, etc XXX */
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}
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ast->pvt->pvt = NULL;
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if (!p->subs[SUB_REAL].owner && !p->subs[SUB_CALLWAIT].owner && !p->subs[SUB_THREEWAY].owner) {
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ast_mutex_unlock(&p->lock);
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/* Remove from list */
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ast_mutex_lock(&featurelock);
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cur = features;
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while(cur) {
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if (cur == p) {
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if (prev)
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prev->next = cur->next;
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else
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features = cur->next;
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break;
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}
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prev = cur;
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cur = cur->next;
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}
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ast_mutex_unlock(&featurelock);
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ast_mutex_lock(&p->lock);
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/* And destroy */
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if (p->subchan)
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ast_hangup(p->subchan);
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ast_mutex_unlock(&p->lock);
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ast_mutex_destroy(&p->lock);
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free(p);
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return 0;
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}
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ast_mutex_unlock(&p->lock);
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return 0;
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}
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static struct feature_pvt *features_alloc(char *data, int format)
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{
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struct feature_pvt *tmp;
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char *dest=NULL;
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char *tech;
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int x;
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int status;
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struct ast_channel *chan;
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tech = ast_strdupa(data);
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if (tech) {
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dest = strchr(tech, '/');
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if (dest) {
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*dest = '\0';
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dest++;
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}
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}
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if (!tech || !dest) {
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ast_log(LOG_NOTICE, "Format for feature channel is Feature/Tech/Dest ('%s' not valid)!\n",
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data);
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return NULL;
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}
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ast_mutex_lock(&featurelock);
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tmp = features;
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while(tmp) {
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if (!strcasecmp(tmp->tech, tech) && !strcmp(tmp->dest, dest))
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break;
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tmp = tmp->next;
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}
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ast_mutex_unlock(&featurelock);
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if (!tmp) {
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chan = ast_request(tech, format, dest, &status);
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if (!chan) {
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ast_log(LOG_NOTICE, "Unable to allocate subchannel '%s/%s'\n", tech, dest);
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return NULL;
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}
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tmp = malloc(sizeof(struct feature_pvt));
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if (tmp) {
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memset(tmp, 0, sizeof(struct feature_pvt));
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for (x=0;x<3;x++)
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init_sub(tmp->subs + x);
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ast_mutex_init(&tmp->lock);
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strncpy(tmp->tech, tech, sizeof(tmp->tech) - 1);
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strncpy(tmp->dest, dest, sizeof(tmp->dest) - 1);
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tmp->subchan = chan;
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ast_mutex_lock(&featurelock);
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tmp->next = features;
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features = tmp;
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ast_mutex_unlock(&featurelock);
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}
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}
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return tmp;
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}
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static struct ast_channel *features_new(struct feature_pvt *p, int state, int index)
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{
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struct ast_channel *tmp;
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int x,y;
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if (!p->subchan) {
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ast_log(LOG_WARNING, "Called upon channel with no subchan:(\n");
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return NULL;
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}
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if (!p->subs[index].owner) {
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ast_log(LOG_WARNING, "Called to put index %d already there!\n", index);
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return NULL;
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}
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tmp = ast_channel_alloc(1);
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if (!tmp)
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return NULL;
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if (tmp) {
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for (x=1;x<4;x++) {
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snprintf(tmp->name, sizeof(tmp->name), "Feature/%s/%s-%d", p->tech, p->dest, x);
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for (y=0;y<3;y++) {
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if (p->subs[x].owner && !strcasecmp(p->subs[x].owner->name, tmp->name))
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break;
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}
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if (y < 3)
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break;
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}
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tmp->type = type;
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ast_setstate(tmp, state);
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tmp->writeformat = p->subchan->writeformat;;
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tmp->pvt->rawwriteformat = p->subchan->pvt->rawwriteformat;
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tmp->readformat = p->subchan->readformat;
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tmp->pvt->rawreadformat = p->subchan->pvt->rawreadformat;
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tmp->pvt->pvt = p;
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tmp->pvt->send_digit = features_digit;
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tmp->pvt->call = features_call;
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tmp->pvt->hangup = features_hangup;
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tmp->pvt->answer = features_answer;
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tmp->pvt->read = features_read;
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tmp->pvt->write = features_write;
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tmp->pvt->exception = features_read;
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tmp->pvt->indicate = features_indicate;
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tmp->pvt->fixup = features_fixup;
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p->subs[index].owner = tmp;
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ast_mutex_lock(&usecnt_lock);
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usecnt++;
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ast_mutex_unlock(&usecnt_lock);
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ast_update_use_count();
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} else
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ast_log(LOG_WARNING, "Unable to allocate channel structure\n");
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return tmp;
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}
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static struct ast_channel *features_request(const char *type, int format, void *data, int *cause)
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{
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struct feature_pvt *p;
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struct ast_channel *chan = NULL;
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p = features_alloc(data, format);
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if (!p->subs[SUB_REAL].owner)
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chan = features_new(p, AST_STATE_DOWN, SUB_REAL);
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return chan;
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}
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static int features_show(int fd, int argc, char **argv)
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{
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struct feature_pvt *p;
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if (argc != 3)
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return RESULT_SHOWUSAGE;
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ast_mutex_lock(&featurelock);
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p = features;
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while(p) {
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ast_mutex_lock(&p->lock);
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ast_cli(fd, "%s -- %s/%s\n", p->owner ? p->owner->name : "<unowned>", p->tech, p->dest);
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ast_mutex_unlock(&p->lock);
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p = p->next;
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}
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if (!features)
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ast_cli(fd, "No feature channels in use\n");
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ast_mutex_unlock(&featurelock);
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return RESULT_SUCCESS;
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}
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static char show_features_usage[] =
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"Usage: feature show channels\n"
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" Provides summary information on feature channels.\n";
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static struct ast_cli_entry cli_show_features = {
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{ "feature", "show", "channels", NULL }, features_show,
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"Show status of feature channels", show_features_usage, NULL };
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int load_module()
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{
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/* Make sure we can register our sip channel type */
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if (ast_channel_register(type, tdesc, capability, features_request)) {
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ast_log(LOG_ERROR, "Unable to register channel class %s\n", type);
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return -1;
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}
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ast_cli_register(&cli_show_features);
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return 0;
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}
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int reload()
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{
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return 0;
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}
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int unload_module()
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{
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struct feature_pvt *p;
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/* First, take us out of the channel loop */
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ast_cli_unregister(&cli_show_features);
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ast_channel_unregister(type);
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if (!ast_mutex_lock(&featurelock)) {
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/* Hangup all interfaces if they have an owner */
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p = features;
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while(p) {
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if (p->owner)
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ast_softhangup(p->owner, AST_SOFTHANGUP_APPUNLOAD);
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p = p->next;
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}
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features = NULL;
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ast_mutex_unlock(&featurelock);
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} else {
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ast_log(LOG_WARNING, "Unable to lock the monitor\n");
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return -1;
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}
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return 0;
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}
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int usecount()
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{
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int res;
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ast_mutex_lock(&usecnt_lock);
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res = usecnt;
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ast_mutex_unlock(&usecnt_lock);
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return res;
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}
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char *key()
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{
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return ASTERISK_GPL_KEY;
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}
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|
|
char *description()
|
|
{
|
|
return desc;
|
|
}
|
|
|