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asterisk/apps/app_chanspy.c

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/*
* Asterisk -- A telephony toolkit for Linux.
*
* ChanSpy Listen in on any channel.
*
* Copyright (C) 2005 Anthony Minessale II (anthmct@yahoo.com)
*
* Disclaimed to Digium
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <stdlib.h>
#include <unistd.h>
#include <string.h>
#include <ctype.h>
#include "asterisk.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/channel.h"
#include "asterisk/features.h"
#include "asterisk/options.h"
#include "asterisk/app.h"
#include "asterisk/utils.h"
#include "asterisk/say.h"
#include "asterisk/pbx.h"
#include "asterisk/translate.h"
#include "asterisk/module.h"
#include "asterisk/lock.h"
#define AST_MONITOR_DIR AST_SPOOL_DIR "/monitor"
AST_MUTEX_DEFINE_STATIC(modlock);
#define ast_fit_in_short(in) (in < -32768 ? -32768 : in > 32767 ? 32767 : in)
#define AST_NAME_STRLEN 256
#define ALL_DONE(u, ret) LOCAL_USER_REMOVE(u); return ret;
#define get_volfactor(x) x ? ((x > 0) ? (1 << x) : ((1 << abs(x)) * -1)) : 0
#define minmax(x,y) x ? (x > y) ? y : ((x < (y * -1)) ? (y * -1) : x) : 0
static char *synopsis = "Tap into any type of asterisk channel and listen to audio";
static char *app = "ChanSpy";
static char *desc = " Chanspy([<scanspec>][|<options>])\n\n"
"Valid Options:\n"
" - q: quiet, don't announce channels beep, etc.\n"
" - b: bridged, only spy on channels involved in a bridged call.\n"
" - v([-4..4]): adjust the initial volume. (negative is quieter)\n"
" - g(grp): enforce group. Match only calls where their ${SPYGROUP} is 'grp'.\n"
" - r[(basename)]: Record session to monitor spool dir (with optional basename, default is 'chanspy')\n\n"
"If <scanspec> is specified, only channel names *beginning* with that string will be scanned.\n"
"('all' or an empty string are also both valid <scanspec>)\n\n"
"While Spying:\n\n"
"Dialing # cycles the volume level.\n"
"Dialing * will stop spying and look for another channel to spy on.\n"
"Dialing a series of digits followed by # builds a channel name to append to <scanspec>\n"
"(e.g. run Chanspy(Agent) and dial 1234# while spying to jump to channel Agent/1234)\n\n"
"";
#define OPTION_QUIET (1 << 0) /* Quiet, no announcement */
#define OPTION_BRIDGED (1 << 1) /* Only look at bridged calls */
#define OPTION_VOLUME (1 << 2) /* Specify initial volume */
#define OPTION_GROUP (1 << 3) /* Only look at channels in group */
#define OPTION_RECORD (1 << 4) /* Record */
AST_DECLARE_OPTIONS(chanspy_opts,{
['q'] = { OPTION_QUIET },
['b'] = { OPTION_BRIDGED },
['v'] = { OPTION_VOLUME, 1 },
['g'] = { OPTION_GROUP, 2 },
['r'] = { OPTION_RECORD, 3 },
});
STANDARD_LOCAL_USER;
LOCAL_USER_DECL;
struct chanspy_translation_helper {
/* spy data */
struct ast_channel_spy spy;
/* read frame */
int fmt0;
short *buf0;
int len0;
struct ast_trans_pvt *trans0;
/* write frame */
int fmt1;
struct ast_trans_pvt *trans1;
short *buf1;
int len1;
/* muxed frame */
struct ast_frame frame;
short *buf;
int len;
int samples;
int rsamples;
int volfactor;
int fd;
};
/* Prototypes */
static struct ast_channel *local_get_channel_begin_name(char *name);
static struct ast_channel *local_channel_walk(struct ast_channel *chan);
static void spy_release(struct ast_channel *chan, void *data);
static void *spy_alloc(struct ast_channel *chan, void *params);
static struct ast_frame *spy_queue_shift(struct ast_channel_spy *spy, int qnum);
static void ast_flush_spy_queue(struct ast_channel_spy *spy);
static int spy_generate(struct ast_channel *chan, void *data, int len, int samples);
static void start_spying(struct ast_channel *chan, struct ast_channel *spychan, struct ast_channel_spy *spy);
static void stop_spying(struct ast_channel *chan, struct ast_channel_spy *spy);
static int channel_spy(struct ast_channel *chan, struct ast_channel *spyee, int *volfactor, int fd);
static int chanspy_exec(struct ast_channel *chan, void *data);
#if 0
static struct ast_channel *local_get_channel_by_name(char *name)
{
struct ast_channel *ret;
ast_mutex_lock(&modlock);
if ((ret = ast_get_channel_by_name_locked(name))) {
ast_mutex_unlock(&ret->lock);
}
ast_mutex_unlock(&modlock);
return ret;
}
#endif
static struct ast_channel *local_channel_walk(struct ast_channel *chan)
{
struct ast_channel *ret;
ast_mutex_lock(&modlock);
if ((ret = ast_channel_walk_locked(chan))) {
ast_mutex_unlock(&ret->lock);
}
ast_mutex_unlock(&modlock);
return ret;
}
static struct ast_channel *local_get_channel_begin_name(char *name)
{
struct ast_channel *chan, *ret = NULL;
ast_mutex_lock(&modlock);
chan = local_channel_walk(NULL);
while (chan) {
if (!strncmp(chan->name, name, strlen(name))) {
ret = chan;
break;
}
chan = local_channel_walk(chan);
}
ast_mutex_unlock(&modlock);
return ret;
}
static void spy_release(struct ast_channel *chan, void *data)
{
struct chanspy_translation_helper *csth = data;
if (csth->trans0) {
ast_translator_free_path(csth->trans0);
csth->trans0 = NULL;
}
if (csth->trans1) {
ast_translator_free_path(csth->trans1);
csth->trans1 = NULL;
}
if (csth->buf0) {
free(csth->buf0);
csth->buf0 = NULL;
}
if (csth->buf1) {
free(csth->buf1);
csth->buf1 = NULL;
}
if (csth->buf) {
free(csth->buf);
csth->buf = NULL;
}
return;
}
static void *spy_alloc(struct ast_channel *chan, void *params)
{
return params;
}
static struct ast_frame *spy_queue_shift(struct ast_channel_spy *spy, int qnum)
{
struct ast_frame *f;
if (qnum < 0 || qnum > 1)
return NULL;
f = spy->queue[qnum];
if (f) {
spy->queue[qnum] = f->next;
return f;
}
return NULL;
}
static void ast_flush_spy_queue(struct ast_channel_spy *spy)
{
struct ast_frame *f=NULL;
int x = 0;
ast_mutex_lock(&spy->lock);
for(x=0;x<2;x++) {
f = NULL;
while((f = spy_queue_shift(spy, x)))
ast_frfree(f);
}
ast_mutex_unlock(&spy->lock);
}
static int spy_generate(struct ast_channel *chan, void *data, int len, int samples)
{
struct ast_frame *f, *f0, *f1;
int x, vf, dlen, maxsamp, loops;
struct chanspy_translation_helper *csth = data;
if (csth->rsamples < csth->samples) {
csth->rsamples += samples;
return 0;
}
csth->rsamples += samples;
loops = 0;
do {
loops++;
f = f0 = f1 = NULL;
x = vf = dlen = maxsamp = 0;
if (csth->rsamples == csth->samples) {
csth->rsamples = csth->samples = 0;
}
ast_mutex_lock(&csth->spy.lock);
f0 = spy_queue_shift(&csth->spy, 0);
f1 = spy_queue_shift(&csth->spy, 1);
ast_mutex_unlock(&csth->spy.lock);
if (csth->spy.status == CHANSPY_DONE) {
return -1;
}
if (!f0 && !f1) {
return 0;
}
if (f0 && csth->fmt0 && csth->fmt0 != f0->subclass) {
ast_translator_free_path(csth->trans0);
csth->trans0 = NULL;
csth->fmt0 = f0->subclass;
}
if (f1 && csth->fmt1 && csth->fmt1 != f1->subclass) {
ast_translator_free_path(csth->trans1);
csth->trans1 = NULL;
csth->fmt1 = f1->subclass;
}
if (!csth->fmt0 && f0) {
csth->fmt0 = f0->subclass;
}
if (!csth->fmt1 && f1) {
csth->fmt1 = f1->subclass;
}
if (csth->fmt0 && csth->fmt0 != AST_FORMAT_SLINEAR && !csth->trans0) {
if ((csth->trans0 = ast_translator_build_path(AST_FORMAT_SLINEAR, csth->fmt0)) == NULL) {
ast_log(LOG_WARNING, "Cannot build a path from %s to slin\n", ast_getformatname(csth->fmt0));
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
if (csth->fmt1 && csth->fmt1 != AST_FORMAT_SLINEAR && !csth->trans1) {
if ((csth->trans1 = ast_translator_build_path(AST_FORMAT_SLINEAR, csth->fmt1)) == NULL) {
ast_log(LOG_WARNING, "Cannot build a path from %s to slin\n", ast_getformatname(csth->fmt1));
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
if (f0) {
if (csth->trans0) {
if ((f = ast_translate(csth->trans0, f0, 0))) {
if (csth->len0 < f->datalen) {
if (!csth->len0) {
if (!(csth->buf0 = malloc(f->datalen * 2))) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
} else {
if (!realloc(csth->buf0, f->datalen * 2)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
csth->len0 = f->datalen;
}
memcpy(csth->buf0, f->data, f->datalen);
maxsamp = f->samples;
ast_frfree(f);
} else {
return 0;
}
} else {
if (csth->len0 < f0->datalen) {
if (!csth->len0) {
if (!(csth->buf0 = malloc(f0->datalen * 2))) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
} else {
if (!realloc(csth->buf0, f0->datalen * 2)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
csth->len0 = f0->datalen;
}
memcpy(csth->buf0, f0->data, f0->datalen);
maxsamp = f0->samples;
}
}
if (f1) {
if (csth->trans1) {
if ((f = ast_translate(csth->trans1, f1, 0))) {
if (csth->len1 < f->datalen) {
if (!csth->len1) {
if (!(csth->buf1 = malloc(f->datalen * 2))) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
} else {
if (!realloc(csth->buf1, f->datalen * 2)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
csth->len1 = f->datalen;
}
memcpy(csth->buf1, f->data, f->datalen);
if (f->samples > maxsamp) {
maxsamp = f->samples;
}
ast_frfree(f);
} else {
return 0;
}
} else {
if (csth->len1 < f1->datalen) {
if (!csth->len1) {
if (!(csth->buf1 = malloc(f1->datalen * 2))) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
} else {
if (!realloc(csth->buf1, f1->datalen * 2)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
csth->len1 = f1->datalen;
}
memcpy(csth->buf1, f1->data, f1->datalen);
if (f1->samples > maxsamp) {
maxsamp = f1->samples;
}
}
}
vf = get_volfactor(csth->volfactor);
vf = minmax(vf, 16);
dlen = (csth->len0 > csth->len1) ? csth->len0 : csth->len1;
if (csth->len < dlen) {
if (!csth->len) {
if (!(csth->buf = malloc(dlen*2))) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
} else {
if (!realloc(csth->buf, dlen * 2)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
}
csth->len = dlen;
}
for(x=0; x < maxsamp; x++) {
if (vf < 0) {
if (f0) {
csth->buf0[x] /= abs(vf);
}
if (f1) {
csth->buf1[x] /= abs(vf);
}
} else if (vf > 0) {
if (f0) {
csth->buf0[x] *= vf;
}
if (f1) {
csth->buf1[x] *= vf;
}
}
if (f0 && f1) {
if (x < csth->len0 && x < csth->len1) {
csth->buf[x] = ast_fit_in_short(csth->buf0[x] + csth->buf1[x]);
} else if (x < csth->len0) {
csth->buf[x] = csth->buf0[x];
} else if (x < csth->len1) {
csth->buf[x] = csth->buf1[x];
}
} else if (f0 && x < csth->len0) {
csth->buf[x] = csth->buf0[x];
} else if (f1 && x < csth->len1) {
csth->buf[x] = csth->buf1[x];
}
}
csth->frame.data = csth->buf;
csth->frame.samples = maxsamp;
csth->frame.datalen = csth->frame.samples * 2;
csth->samples += csth->frame.samples;
if (ast_write(chan, &csth->frame)) {
csth->spy.status = CHANSPY_DONE;
return -1;
}
if (csth->fd) {
write(csth->fd, csth->frame.data, csth->frame.datalen);
}
if (f0) {
ast_frfree(f0);
}
if (f1) {
ast_frfree(f1);
}
if (loops > 10) {
ast_log(LOG_WARNING, "Too Many Loops Bailing Out....");
break;
}
} while (csth->samples < csth->rsamples);
return 0;
}
static struct ast_generator spygen = {
alloc: spy_alloc,
release: spy_release,
generate: spy_generate,
};
static void start_spying(struct ast_channel *chan, struct ast_channel *spychan, struct ast_channel_spy *spy)
{
struct ast_channel_spy *cptr=NULL;
struct ast_channel *peer;
ast_log(LOG_WARNING, "Attaching %s to %s\n", spychan->name, chan->name);
ast_mutex_lock(&chan->lock);
if (chan->spiers) {
for(cptr=chan->spiers;cptr && cptr->next;cptr=cptr->next);
cptr->next = spy;
} else {
chan->spiers = spy;
}
ast_mutex_unlock(&chan->lock);
if ( ast_test_flag(chan, AST_FLAG_NBRIDGE) && (peer = ast_bridged_channel(chan))) {
ast_softhangup(peer, AST_SOFTHANGUP_UNBRIDGE);
}
}
static void stop_spying(struct ast_channel *chan, struct ast_channel_spy *spy)
{
struct ast_channel_spy *cptr=NULL, *prev=NULL;
int count = 0;
while(ast_mutex_trylock(&chan->lock)) {
/* if its locked already it's almost surely hanging up and we are too late
we can safely remove the head pointer if it points at us without needing a lock.
since everybody spying will be in the same boat whomever is pointing at the head
will surely erase it which is all we really need since it's a linked list of
staticly declared structs that belong to each spy.
*/
if (chan->spiers == spy) {
chan->spiers = NULL;
return;
}
count++;
if (count > 10) {
return;
}
sched_yield();
}
for(cptr=chan->spiers; cptr; cptr=cptr->next) {
if (cptr == spy) {
if (prev) {
prev->next = cptr->next;
cptr->next = NULL;
} else
chan->spiers = NULL;
}
prev = cptr;
}
ast_mutex_unlock(&chan->lock);
}
static int channel_spy(struct ast_channel *chan, struct ast_channel *spyee, int *volfactor, int fd)
{
struct chanspy_translation_helper csth;
int running = 1, res = 0, x = 0;
char inp[24];
char *name=NULL;
struct ast_frame *f;
if (chan && !ast_check_hangup(chan) && spyee && !ast_check_hangup(spyee)) {
memset(inp, 0, sizeof(inp));
name = ast_strdupa(spyee->name);
if (option_verbose >= 2)
ast_verbose(VERBOSE_PREFIX_2 "Spying on channel %s\n", name);
memset(&csth, 0, sizeof(csth));
csth.spy.status = CHANSPY_RUNNING;
ast_mutex_init(&csth.spy.lock);
csth.volfactor = *volfactor;
csth.frame.frametype = AST_FRAME_VOICE;
csth.frame.subclass = AST_FORMAT_SLINEAR;
csth.frame.datalen = 320;
csth.frame.samples = 160;
if (fd) {
csth.fd = fd;
}
start_spying(spyee, chan, &csth.spy);
ast_activate_generator(chan, &spygen, &csth);
while(csth.spy.status == CHANSPY_RUNNING &&
chan && !ast_check_hangup(chan) &&
spyee &&
!ast_check_hangup(spyee)
&& running == 1 &&
(res = ast_waitfor(chan, -1) > -1)) {
if ((f = ast_read(chan))) {
res = 0;
if (f->frametype == AST_FRAME_DTMF) {
res = f->subclass;
}
ast_frfree(f);
if (!res) {
continue;
}
} else {
break;
}
if (x == sizeof(inp)) {
x = 0;
}
if (res < 0) {
running = -1;
}
if (res == 0) {
continue;
} else if (res == '*') {
running = 0;
} else if (res == '#') {
if (!ast_strlen_zero(inp)) {
running = x ? atoi(inp) : -1;
break;
} else {
csth.volfactor++;
if (csth.volfactor > 4) {
csth.volfactor = -4;
}
if (option_verbose > 2) {
ast_verbose(VERBOSE_PREFIX_3"Setting spy volume on %s to %d\n", chan->name, csth.volfactor);
}
*volfactor = csth.volfactor;
}
} else if (res >= 48 && res <= 57) {
inp[x++] = res;
}
}
ast_deactivate_generator(chan);
stop_spying(spyee, &csth.spy);
if (option_verbose >= 2) {
ast_verbose(VERBOSE_PREFIX_2 "Done Spying on channel %s\n", name);
}
ast_flush_spy_queue(&csth.spy);
} else {
running = 0;
}
ast_mutex_destroy(&csth.spy.lock);
return running;
}
static int chanspy_exec(struct ast_channel *chan, void *data)
{
struct localuser *u;
struct ast_channel *peer=NULL, *prev=NULL;
char name[AST_NAME_STRLEN],
peer_name[AST_NAME_STRLEN],
*args,
*ptr = NULL,
*options = NULL,
*spec = NULL,
*argv[5],
*mygroup = NULL,
*recbase = NULL;
int res = -1,
volfactor = 0,
silent = 0,
argc = 0,
bronly = 0,
chosen = 0,
count=0,
waitms = 100,
num = 0,
oldrf = 0,
oldwf = 0,
fd = 0;
struct ast_flags flags;
if (!(args = ast_strdupa((char *)data))) {
ast_log(LOG_ERROR, "Out of memory!\n");
return -1;
}
oldrf = chan->readformat;
oldwf = chan->writeformat;
if (ast_set_read_format(chan, AST_FORMAT_SLINEAR) < 0) {
ast_log(LOG_ERROR, "Could Not Set Read Format.\n");
return -1;
}
if (ast_set_write_format(chan, AST_FORMAT_SLINEAR) < 0) {
ast_log(LOG_ERROR, "Could Not Set Write Format.\n");
return -1;
}
LOCAL_USER_ADD(u);
ast_answer(chan);
ast_set_flag(chan, AST_FLAG_SPYING); /* so nobody can spy on us while we are spying */
if ((argc = ast_separate_app_args(args, '|', argv, sizeof(argv) / sizeof(argv[0])))) {
spec = argv[0];
if ( argc > 1) {
options = argv[1];
}
if (ast_strlen_zero(spec) || !strcmp(spec, "all")) {
spec = NULL;
}
}
if (options) {
char *opts[3];
ast_parseoptions(chanspy_opts, &flags, opts, options);
if (ast_test_flag(&flags, OPTION_GROUP)) {
mygroup = opts[1];
}
if (ast_test_flag(&flags, OPTION_RECORD)) {
if (!(recbase = opts[2])) {
recbase = "chanspy";
}
}
silent = ast_test_flag(&flags, OPTION_QUIET);
bronly = ast_test_flag(&flags, OPTION_BRIDGED);
if (ast_test_flag(&flags, OPTION_VOLUME) && opts[1]) {
if (sscanf(opts[0], "%d", &volfactor) != 1)
ast_log(LOG_NOTICE, "volfactor must be a number between -4 and 4\n");
else {
volfactor = minmax(volfactor, 4);
}
}
}
if (recbase) {
char filename[512];
snprintf(filename,sizeof(filename),"%s/%s.%ld.raw",AST_MONITOR_DIR, recbase, time(NULL));
if ((fd = open(filename, O_CREAT | O_WRONLY, O_TRUNC)) <= 0) {
ast_log(LOG_WARNING, "Cannot open %s for recording\n", filename);
fd = 0;
}
}
for(;;) {
res = ast_streamfile(chan, "beep", chan->language);
if (!res)
res = ast_waitstream(chan, "");
if (res < 0) {
ast_clear_flag(chan, AST_FLAG_SPYING);
break;
}
count = 0;
res = ast_waitfordigit(chan, waitms);
if (res < 0) {
ast_clear_flag(chan, AST_FLAG_SPYING);
break;
}
peer = local_channel_walk(NULL);
prev=NULL;
while(peer) {
if (peer != chan) {
char *group = NULL;
int igrp = 1;
if (peer == prev && !chosen) {
break;
}
chosen = 0;
group = pbx_builtin_getvar_helper(peer, "SPYGROUP");
if (mygroup) {
if (!group || strcmp(mygroup, group)) {
igrp = 0;
}
}
if (igrp && (!spec || ((strlen(spec) < strlen(peer->name) &&
!strncasecmp(peer->name, spec, strlen(spec)))))) {
if (peer && (!bronly || ast_bridged_channel(peer)) &&
!ast_check_hangup(peer) && !ast_test_flag(peer, AST_FLAG_SPYING)) {
int x = 0;
strncpy(peer_name, peer->name, AST_NAME_STRLEN);
ptr = strchr(peer_name, '/');
*ptr = '\0';
ptr++;
for (x = 0 ; x < strlen(peer_name) ; x++) {
if (peer_name[x] == '/') {
break;
}
peer_name[x] = tolower(peer_name[x]);
}
if (!silent) {
if (ast_fileexists(peer_name, NULL, NULL) != -1) {
res = ast_streamfile(chan, peer_name, chan->language);
if (!res)
res = ast_waitstream(chan, "");
if (res)
break;
} else
res = ast_say_character_str(chan, peer_name, "", chan->language);
if ((num=atoi(ptr)))
ast_say_digits(chan, atoi(ptr), "", chan->language);
}
count++;
prev = peer;
res = channel_spy(chan, peer, &volfactor, fd);
if (res == -1) {
break;
} else if (res > 1 && spec) {
snprintf(name, AST_NAME_STRLEN, "%s/%d", spec, res);
if ((peer = local_get_channel_begin_name(name))) {
chosen = 1;
}
continue;
}
}
}
}
if ((peer = local_channel_walk(peer)) == NULL) {
break;
}
}
waitms = count ? 100 : 5000;
}
if (fd > 0) {
close(fd);
}
if (oldrf && ast_set_read_format(chan, oldrf) < 0) {
ast_log(LOG_ERROR, "Could Not Set Read Format.\n");
}
if (oldwf && ast_set_write_format(chan, oldwf) < 0) {
ast_log(LOG_ERROR, "Could Not Set Write Format.\n");
}
ast_clear_flag(chan, AST_FLAG_SPYING);
ALL_DONE(u, res);
}
int unload_module(void)
{
STANDARD_HANGUP_LOCALUSERS;
return ast_unregister_application(app);
}
int load_module(void)
{
return ast_register_application(app, chanspy_exec, synopsis, desc);
}
char *description(void)
{
return synopsis;
}
int usecount(void)
{
int res;
STANDARD_USECOUNT(res);
return res;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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