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asterisk/res/res_fax.c

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/*
* Asterisk -- An open source telephony toolkit.
*
* Copyright (C) 2008-2009, Digium, Inc.
*
* Dwayne M. Hubbard <dhubbard@digium.com>
* Kevin P. Fleming <kpfleming@digium.com>
* Matthew Nicholson <mnicholson@digium.com>
*
* Initial T.38-gateway code
* 2008, Daniel Ferenci <daniel.ferenci@nethemba.com>
* Created by Nethemba s.r.o. http://www.nethemba.com
* Sponsored by IPEX a.s. http://www.ipex.cz
*
* T.38-gateway integration into asterisk app_fax and rework
* 2008-2011, Gregory Hinton Nietsky <gregory@distrotech.co.za>
* dns Telecom http://www.dnstelecom.co.za
*
* Modified to make T.38-gateway compatible with Asterisk 1.6.2
* 2010, Anton Verevkin <mymail@verevkin.it>
* ViaNetTV http://www.vianettv.com
*
* Modified to make T.38-gateway work
* 2010, Klaus Darilion, IPCom GmbH, www.ipcom.at
*
* See http://www.asterisk.org for more information about
* the Asterisk project. Please do not directly contact
* any of the maintainers of this project for assistance;
* the project provides a web site, mailing lists and IRC
* channels for your use.
*
* This program is free software, distributed under the terms of
* the GNU General Public License Version 2. See the LICENSE file
* at the top of the source tree.
*/
/*** MODULEINFO
<conflict>app_fax</conflict>
***/
/*! \file
*
* \brief Generic FAX Resource for FAX technology resource modules
*
* \author Dwayne M. Hubbard <dhubbard@digium.com>
* \author Kevin P. Fleming <kpfleming@digium.com>
* \author Matthew Nicholson <mnicholson@digium.com>
* \author Gregory H. Nietsky <gregory@distrotech.co.za>
*
* A generic FAX resource module that provides SendFAX and ReceiveFAX applications.
* This module requires FAX technology modules, like res_fax_spandsp, to register with it
* so it can use the technology modules to perform the actual FAX transmissions.
* \ingroup applications
*/
#include "asterisk.h"
ASTERISK_FILE_VERSION(__FILE__, "$Revision$")
#include "asterisk/io.h"
#include "asterisk/file.h"
#include "asterisk/logger.h"
#include "asterisk/module.h"
#include "asterisk/app.h"
#include "asterisk/lock.h"
#include "asterisk/options.h"
#include "asterisk/strings.h"
#include "asterisk/cli.h"
#include "asterisk/utils.h"
#include "asterisk/config.h"
#include "asterisk/astobj2.h"
#include "asterisk/res_fax.h"
#include "asterisk/file.h"
#include "asterisk/channel.h"
#include "asterisk/pbx.h"
#include "asterisk/manager.h"
#include "asterisk/dsp.h"
#include "asterisk/indications.h"
#include "asterisk/ast_version.h"
#include "asterisk/translate.h"
/*** DOCUMENTATION
<application name="ReceiveFax" language="en_US">
<synopsis>
Receive a FAX and save as a TIFF/F file.
</synopsis>
<syntax>
<parameter name="filename" required="true" />
<parameter name="options">
<optionlist>
<option name="d">
<para>Enable FAX debugging.</para>
</option>
<option name="f">
<para>Allow audio fallback FAX transfer on T.38 capable channels.</para>
</option>
<option name="F">
<para>Force usage of audio mode on T.38 capable channels.</para>
</option>
<option name="s">
<para>Send progress Manager events (overrides statusevents setting in res_fax.conf).</para>
</option>
</optionlist>
</parameter>
</syntax>
<description>
<para>This application is provided by res_fax, which is a FAX technology agnostic module
that utilizes FAX technology resource modules to complete a FAX transmission.</para>
<para>Session arguments can be set by the FAXOPT function and to check results of the ReceiveFax() application.</para>
</description>
<see-also>
<ref type="function">FAXOPT</ref>
</see-also>
</application>
<application name="SendFax" language="en_US">
<synopsis>
Sends a specified TIFF/F file as a FAX.
</synopsis>
<syntax>
<parameter name="filename" required="true" argsep="&amp;">
<argument name="filename2" multiple="true">
<para>TIFF file to send as a FAX.</para>
</argument>
</parameter>
<parameter name="options">
<optionlist>
<option name="d">
<para>Enable FAX debugging.</para>
</option>
<option name="f">
<para>Allow audio fallback FAX transfer on T.38 capable channels.</para>
</option>
<option name="F">
<para>Force usage of audio mode on T.38 capable channels.</para>
</option>
<option name="s">
<para>Send progress Manager events (overrides statusevents setting in res_fax.conf).</para>
</option>
<option name="z">
<para>Initiate a T.38 reinvite on the channel if the remote end does not.</para>
</option>
</optionlist>
</parameter>
</syntax>
<description>
<para>This application is provided by res_fax, which is a FAX technology agnostic module
that utilizes FAX technology resource modules to complete a FAX transmission.</para>
<para>Session arguments can be set by the FAXOPT function and to check results of the SendFax() application.</para>
</description>
<see-also>
<ref type="function">FAXOPT</ref>
</see-also>
</application>
<function name="FAXOPT" language="en_US">
<synopsis>
Gets/sets various pieces of information about a fax session.
</synopsis>
<syntax>
<parameter name="item" required="true">
<enumlist>
<enum name="ecm">
<para>R/W Error Correction Mode (ECM) enable with 'yes', disable with 'no'.</para>
</enum>
<enum name="error">
<para>R/O FAX transmission error code upon failure.</para>
</enum>
<enum name="filename">
<para>R/O Filename of the first file of the FAX transmission.</para>
</enum>
<enum name="filenames">
<para>R/O Filenames of all of the files in the FAX transmission (comma separated).</para>
</enum>
<enum name="headerinfo">
<para>R/W FAX header information.</para>
</enum>
<enum name="localstationid">
<para>R/W Local Station Identification.</para>
</enum>
<enum name="minrate">
<para>R/W Minimum transfer rate set before transmission.</para>
</enum>
<enum name="maxrate">
<para>R/W Maximum transfer rate set before transmission.</para>
</enum>
<enum name="modem">
<para>R/W Modem type (v17/v27/v29).</para>
</enum>
<enum name="gateway">
<para>R/W T38 Gateway Enabled (yes/no)</para>
</enum>
<enum name="pages">
<para>R/O Number of pages transferred.</para>
</enum>
<enum name="rate">
<para>R/O Negotiated transmission rate.</para>
</enum>
<enum name="remotestationid">
<para>R/O Remote Station Identification after transmission.</para>
</enum>
<enum name="resolution">
<para>R/O Negotiated image resolution after transmission.</para>
</enum>
<enum name="sessionid">
<para>R/O Session ID of the FAX transmission.</para>
</enum>
<enum name="status">
<para>R/O Result Status of the FAX transmission.</para>
</enum>
<enum name="statusstr">
<para>R/O Verbose Result Status of the FAX transmission.</para>
</enum>
</enumlist>
</parameter>
</syntax>
<description>
<para>FAXOPT can be used to override the settings for a FAX session listed in <filename>res_fax.conf</filename>,
it can also be used to retreive information about a FAX session that has finished eg. pages/status.</para>
</description>
<see-also>
<ref type="application">ReceiveFax</ref>
<ref type="application">SendFax</ref>
</see-also>
</function>
***/
static const char app_receivefax[] = "ReceiveFAX";
static const char app_sendfax[] = "SendFAX";
struct debug_info_history {
unsigned int consec_frames;
unsigned int consec_ms;
unsigned char silence;
};
struct ast_fax_debug_info {
struct timeval base_tv;
struct debug_info_history c2s, s2c;
struct ast_dsp *dsp;
};
/*! \brief used for gateway framehook */
struct fax_gateway {
/*! \brief FAX Session */
struct ast_fax_session *s;
/*! \brief reserved fax session token */
struct ast_fax_tech_token *token;
/*! \brief the start of our timeout counter */
struct timeval timeout_start;
/*! \brief the start of our ced timeout */
struct timeval ced_timeout_start;
/*! \brief DSP Processor */
struct ast_dsp *chan_dsp;
struct ast_dsp *peer_dsp;
/*! \brief framehook used in gateway mode */
int framehook;
/*! \brief bridged */
int bridged:1;
/*! \brief 1 if the ced tone came from chan, 0 if it came from peer */
int ced_chan:1;
/*! \brief a flag to track the state of our negotiation */
enum ast_t38_state t38_state;
/*! \brief original audio formats */
struct ast_format chan_read_format;
struct ast_format chan_write_format;
struct ast_format peer_read_format;
struct ast_format peer_write_format;
};
static int fax_logger_level = -1;
/*! \brief maximum buckets for res_fax ao2 containers */
#define FAX_MAXBUCKETS 10
#define RES_FAX_TIMEOUT 10000
#define FAX_GATEWAY_TIMEOUT RES_FAX_TIMEOUT
#define FAX_GATEWAY_CED_TIMEOUT 3000
/*! \brief The faxregistry is used to manage information and statistics for all FAX sessions. */
static struct {
/*! The number of active FAX sessions */
int active_sessions;
/*! The number of reserved FAX sessions */
int reserved_sessions;
/*! active sessions are astobj2 objects */
struct ao2_container *container;
/*! Total number of Tx FAX attempts */
int fax_tx_attempts;
/*! Total number of Rx FAX attempts */
int fax_rx_attempts;
/*! Number of successful FAX transmissions */
int fax_complete;
/*! Number of failed FAX transmissions */
int fax_failures;
/*! the next unique session name */
int nextsessionname;
} faxregistry;
/*! \brief registered FAX technology modules are put into this list */
struct fax_module {
const struct ast_fax_tech *tech;
AST_RWLIST_ENTRY(fax_module) list;
};
static AST_RWLIST_HEAD_STATIC(faxmodules, fax_module);
#define RES_FAX_MINRATE 2400
#define RES_FAX_MAXRATE 14400
#define RES_FAX_STATUSEVENTS 0
#define RES_FAX_MODEM (AST_FAX_MODEM_V17 | AST_FAX_MODEM_V27 | AST_FAX_MODEM_V29)
static struct {
enum ast_fax_modems modems;
uint32_t statusevents:1;
uint32_t ecm:1;
unsigned int minrate;
unsigned int maxrate;
} general_options;
static const char *config = "res_fax.conf";
static int global_fax_debug = 0;
enum {
OPT_CALLEDMODE = (1 << 0),
OPT_CALLERMODE = (1 << 1),
OPT_DEBUG = (1 << 2),
OPT_STATUS = (1 << 3),
OPT_ALLOWAUDIO = (1 << 5),
OPT_REQUEST_T38 = (1 << 6),
OPT_FORCE_AUDIO = (1 << 7),
};
AST_APP_OPTIONS(fax_exec_options, BEGIN_OPTIONS
AST_APP_OPTION('a', OPT_CALLEDMODE),
AST_APP_OPTION('c', OPT_CALLERMODE),
AST_APP_OPTION('d', OPT_DEBUG),
AST_APP_OPTION('f', OPT_ALLOWAUDIO),
AST_APP_OPTION('F', OPT_FORCE_AUDIO),
AST_APP_OPTION('s', OPT_STATUS),
AST_APP_OPTION('z', OPT_REQUEST_T38),
END_OPTIONS);
struct manager_event_info {
char context[AST_MAX_CONTEXT];
char exten[AST_MAX_EXTENSION];
char cid[128];
};
static void debug_check_frame_for_silence(struct ast_fax_session *s, unsigned int c2s, struct ast_frame *frame)
{
struct debug_info_history *history = c2s ? &s->debug_info->c2s : &s->debug_info->s2c;
int dspsilence;
unsigned int last_consec_frames, last_consec_ms;
unsigned char wassil;
struct timeval diff;
diff = ast_tvsub(ast_tvnow(), s->debug_info->base_tv);
ast_dsp_reset(s->debug_info->dsp);
ast_dsp_silence(s->debug_info->dsp, frame, &dspsilence);
wassil = history->silence;
history->silence = (dspsilence != 0) ? 1 : 0;
if (history->silence != wassil) {
last_consec_frames = history->consec_frames;
last_consec_ms = history->consec_ms;
history->consec_frames = 0;
history->consec_ms = 0;
if ((last_consec_frames != 0)) {
ast_verb(6, "Channel '%s' fax session '%d', [ %.3ld.%.6ld ], %s sent %d frames (%d ms) of %s.\n",
s->channame, s->id, (long) diff.tv_sec, (long int) diff.tv_usec,
(c2s) ? "channel" : "stack", last_consec_frames, last_consec_ms,
(wassil) ? "silence" : "energy");
}
}
history->consec_frames++;
history->consec_ms += (frame->samples / 8);
}
static void destroy_callback(void *data)
{
if (data) {
ao2_ref(data, -1);
}
}
static const struct ast_datastore_info fax_datastore = {
.type = "res_fax",
.destroy = destroy_callback,
};
/*! \brief returns a reference counted pointer to a fax datastore, if it exists */
static struct ast_fax_session_details *find_details(struct ast_channel *chan)
{
struct ast_fax_session_details *details;
struct ast_datastore *datastore;
ast_channel_lock(chan);
if (!(datastore = ast_channel_datastore_find(chan, &fax_datastore, NULL))) {
ast_channel_unlock(chan);
return NULL;
}
if (!(details = datastore->data)) {
ast_log(LOG_WARNING, "Huh? channel '%s' has a FAX datastore without data!\n", chan->name);
ast_channel_unlock(chan);
return NULL;
}
ao2_ref(details, 1);
ast_channel_unlock(chan);
return details;
}
/*! \brief destroy a FAX session details structure */
static void destroy_session_details(void *details)
{
struct ast_fax_session_details *d = details;
struct ast_fax_document *doc;
while ((doc = AST_LIST_REMOVE_HEAD(&d->documents, next))) {
ast_free(doc);
}
ast_string_field_free_memory(d);
}
/*! \brief create a FAX session details structure */
static struct ast_fax_session_details *session_details_new(void)
{
struct ast_fax_session_details *d;
if (!(d = ao2_alloc(sizeof(*d), destroy_session_details))) {
return NULL;
}
if (ast_string_field_init(d, 512)) {
ao2_ref(d, -1);
return NULL;
}
AST_LIST_HEAD_INIT_NOLOCK(&d->documents);
/* These options need to be set to the configured default and may be overridden by
* SendFAX, ReceiveFAX, or FAXOPT */
d->option.request_t38 = AST_FAX_OPTFLAG_FALSE;
d->option.send_cng = AST_FAX_OPTFLAG_FALSE;
d->option.send_ced = AST_FAX_OPTFLAG_FALSE;
d->option.ecm = general_options.ecm;
d->option.statusevents = general_options.statusevents;
d->modems = general_options.modems;
d->minrate = general_options.minrate;
d->maxrate = general_options.maxrate;
d->gateway_id = -1;
return d;
}
static struct ast_control_t38_parameters our_t38_parameters = {
.version = 0,
.max_ifp = 400,
.rate = AST_T38_RATE_14400,
.rate_management = AST_T38_RATE_MANAGEMENT_TRANSFERRED_TCF,
};
static void t38_parameters_ast_to_fax(struct ast_fax_t38_parameters *dst, const struct ast_control_t38_parameters *src)
{
dst->version = src->version;
dst->max_ifp = src->max_ifp;
dst->rate = src->rate;
dst->rate_management = src->rate_management;
dst->fill_bit_removal = src->fill_bit_removal;
dst->transcoding_mmr = src->transcoding_mmr;
dst->transcoding_jbig = src->transcoding_jbig;
}
static void t38_parameters_fax_to_ast(struct ast_control_t38_parameters *dst, const struct ast_fax_t38_parameters *src)
{
dst->version = src->version;
dst->max_ifp = src->max_ifp;
dst->rate = src->rate;
dst->rate_management = src->rate_management;
dst->fill_bit_removal = src->fill_bit_removal;
dst->transcoding_mmr = src->transcoding_mmr;
dst->transcoding_jbig = src->transcoding_jbig;
}
/*! \brief returns a reference counted details structure from the channel's fax datastore. If the datastore
* does not exist it will be created */
static struct ast_fax_session_details *find_or_create_details(struct ast_channel *chan)
{
struct ast_fax_session_details *details;
struct ast_datastore *datastore;
if ((details = find_details(chan))) {
return details;
}
/* channel does not have one so we must create one */
if (!(details = session_details_new())) {
ast_log(LOG_WARNING, "channel '%s' can't get a FAX details structure for the datastore!\n", chan->name);
return NULL;
}
if (!(datastore = ast_datastore_alloc(&fax_datastore, NULL))) {
ao2_ref(details, -1);
ast_log(LOG_WARNING, "channel '%s' can't get a datastore!\n", chan->name);
return NULL;
}
/* add the datastore to the channel and increment the refcount */
datastore->data = details;
/* initialize default T.38 parameters */
t38_parameters_ast_to_fax(&details->our_t38_parameters, &our_t38_parameters);
t38_parameters_ast_to_fax(&details->their_t38_parameters, &our_t38_parameters);
ao2_ref(details, 1);
ast_channel_lock(chan);
ast_channel_datastore_add(chan, datastore);
ast_channel_unlock(chan);
return details;
}
unsigned int ast_fax_maxrate(void)
{
return general_options.maxrate;
}
unsigned int ast_fax_minrate(void)
{
return general_options.minrate;
}
static int update_modem_bits(enum ast_fax_modems *bits, const char *value)
{
char *m[5], *tok, *v = (char *)value;
int i = 0, j;
if (!(tok = strchr(v, ','))) {
m[i++] = v;
m[i] = NULL;
} else {
tok = strtok(v, ", ");
while (tok && (i < 5)) {
m[i++] = tok;
tok = strtok(NULL, ", ");
}
m[i] = NULL;
}
*bits = 0;
for (j = 0; j < i; j++) {
if (!strcasecmp(m[j], "v17")) {
*bits |= AST_FAX_MODEM_V17;
} else if (!strcasecmp(m[j], "v27")) {
*bits |= AST_FAX_MODEM_V27;
} else if (!strcasecmp(m[j], "v29")) {
*bits |= AST_FAX_MODEM_V29;
} else if (!strcasecmp(m[j], "v34")) {
*bits |= AST_FAX_MODEM_V34;
} else {
ast_log(LOG_WARNING, "ignoring invalid modem setting: '%s', valid options {v17 | v27 | v29 | v34}\n", m[j]);
}
}
return 0;
}
static int ast_fax_modem_to_str(enum ast_fax_modems bits, char *tbuf, size_t bufsize)
{
int count = 0;
if (bits & AST_FAX_MODEM_V17) {
strcat(tbuf, "V17");
count++;
}
if (bits & AST_FAX_MODEM_V27) {
if (count) {
strcat(tbuf, ",");
}
strcat(tbuf, "V27");
count++;
}
if (bits & AST_FAX_MODEM_V29) {
if (count) {
strcat(tbuf, ",");
}
strcat(tbuf, "V29");
count++;
}
if (bits & AST_FAX_MODEM_V34) {
if (count) {
strcat(tbuf, ",");
}
strcat(tbuf, "V34");
count++;
}
return 0;
}
static int check_modem_rate(enum ast_fax_modems modems, unsigned int rate)
{
switch (rate) {
case 2400:
if (!(modems & (AST_FAX_MODEM_V27 | AST_FAX_MODEM_V34))) {
return 1;
}
break;
case 4800:
if (!(modems & (AST_FAX_MODEM_V27 | AST_FAX_MODEM_V34))) {
return 1;
}
break;
case 7200:
case 9600:
if (!(modems & (AST_FAX_MODEM_V17 | AST_FAX_MODEM_V29 | AST_FAX_MODEM_V34))) {
return 1;
}
break;
case 12000:
case 14400:
if (!(modems & (AST_FAX_MODEM_V17 | AST_FAX_MODEM_V34))) {
return 1;
}
break;
case 28800:
case 33600:
if (!(modems & AST_FAX_MODEM_V34)) {
return 1;
}
break;
default:
/* this should never happen */
return 1;
}
return 0;
}
/*! \brief register a FAX technology module */
int ast_fax_tech_register(struct ast_fax_tech *tech)
{
struct fax_module *fax;
if (!(fax = ast_calloc(1, sizeof(*fax)))) {
return -1;
}
fax->tech = tech;
AST_RWLIST_WRLOCK(&faxmodules);
AST_RWLIST_INSERT_TAIL(&faxmodules, fax, list);
AST_RWLIST_UNLOCK(&faxmodules);
ast_module_ref(ast_module_info->self);
ast_verb(3, "Registered handler for '%s' (%s)\n", fax->tech->type, fax->tech->description);
return 0;
}
/*! \brief unregister a FAX technology module */
void ast_fax_tech_unregister(struct ast_fax_tech *tech)
{
struct fax_module *fax;
ast_verb(3, "Unregistering FAX module type '%s'\n", tech->type);
AST_RWLIST_WRLOCK(&faxmodules);
AST_RWLIST_TRAVERSE_SAFE_BEGIN(&faxmodules, fax, list) {
if (fax->tech != tech) {
continue;
}
AST_RWLIST_REMOVE_CURRENT(list);
ast_module_unref(ast_module_info->self);
ast_free(fax);
ast_verb(4, "Unregistered FAX module type '%s'\n", tech->type);
break;
}
AST_RWLIST_TRAVERSE_SAFE_END;
AST_RWLIST_UNLOCK(&faxmodules);
}
/*! \brief convert a ast_fax_state to a string */
const char *ast_fax_state_to_str(enum ast_fax_state state)
{
switch (state) {
case AST_FAX_STATE_UNINITIALIZED:
return "Uninitialized";
case AST_FAX_STATE_INITIALIZED:
return "Initialized";
case AST_FAX_STATE_OPEN:
return "Open";
case AST_FAX_STATE_ACTIVE:
return "Active";
case AST_FAX_STATE_COMPLETE:
return "Complete";
case AST_FAX_STATE_RESERVED:
return "Reserved";
case AST_FAX_STATE_INACTIVE:
return "Inactive";
default:
ast_log(LOG_WARNING, "unhandled FAX state: %d\n", state);
return "Unknown";
}
}
void ast_fax_log(int level, const char *file, const int line, const char *function, const char *msg)
{
if (fax_logger_level != -1) {
ast_log_dynamic_level(fax_logger_level, "%s", msg);
} else {
ast_log(level, file, line, function, "%s", msg);
}
}
/*! \brief convert a rate string to a rate */
static unsigned int fax_rate_str_to_int(const char *ratestr)
{
int rate;
if (sscanf(ratestr, "%d", &rate) != 1) {
ast_log(LOG_ERROR, "failed to sscanf '%s' to rate\n", ratestr);
return 0;
}
switch (rate) {
case 2400:
case 4800:
case 7200:
case 9600:
case 12000:
case 14400:
case 28800:
case 33600:
return rate;
default:
ast_log(LOG_WARNING, "ignoring invalid rate '%s'. Valid options are {2400 | 4800 | 7200 | 9600 | 12000 | 14400 | 28800 | 33600}\n", ratestr);
return 0;
}
}
/*! \brief Release a session token.
* \param s a session returned from fax_session_reserve()
* \param token a token generated from fax_session_reserve()
*
* This function releases the given token and marks the given session as no
* longer reserved. It is safe to call on a session that is not actually
* reserved and with a NULL token. This is so that sessions returned by
* technologies that do not support reserved sessions don't require extra logic
* to handle.
*
* \note This function DOES NOT release the given fax session, only the given
* token.
*/
static void fax_session_release(struct ast_fax_session *s, struct ast_fax_tech_token *token)
{
if (token) {
s->tech->release_token(token);
}
if (s->state == AST_FAX_STATE_RESERVED) {
ast_atomic_fetchadd_int(&faxregistry.reserved_sessions, -1);
s->state = AST_FAX_STATE_INACTIVE;
}
}
/*! \brief destroy a FAX session structure */
static void destroy_session(void *session)
{
struct ast_fax_session *s = session;
if (s->tech) {
fax_session_release(s, NULL);
if (s->tech_pvt) {
s->tech->destroy_session(s);
}
ast_module_unref(s->tech->module);
}
if (s->details) {
ao2_ref(s->details, -1);
}
if (s->debug_info) {
ast_dsp_free(s->debug_info->dsp);
ast_free(s->debug_info);
}
if (s->smoother) {
ast_smoother_free(s->smoother);
}
if (s->state != AST_FAX_STATE_INACTIVE) {
ast_atomic_fetchadd_int(&faxregistry.active_sessions, -1);
}
ast_free(s->channame);
ast_free(s->chan_uniqueid);
}
/*! \brief Reserve a fax session.
* \param details the fax session details
* \param token a pointer to a place to store a token to be passed to fax_session_new() later
*
* This function reserves a fax session for use later. If the selected fax
* technology does not support reserving sessions a session will still be
* returned but token will not be set.
*
* \note The reference returned by this function does not get consumed by
* fax_session_new() and must always be dereferenced separately.
*
* \return NULL or an uninitialized and possibly reserved session
*/
static struct ast_fax_session *fax_session_reserve(struct ast_fax_session_details *details, struct ast_fax_tech_token **token)
{
struct ast_fax_session *s;
struct fax_module *faxmod;
if (!(s = ao2_alloc(sizeof(*s), destroy_session))) {
return NULL;
}
s->state = AST_FAX_STATE_INACTIVE;
s->details = details;
ao2_ref(s->details, 1);
/* locate a FAX technology module that can handle said requirements
* Note: the requirements have not yet been finalized as T.38
* negotiation has not yet occured. */
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, faxmod, list) {
if ((faxmod->tech->caps & details->caps) != details->caps) {
continue;
}
ast_debug(4, "Reserving a FAX session from '%s'.\n", faxmod->tech->description);
ast_module_ref(faxmod->tech->module);
s->tech = faxmod->tech;
break;
}
AST_RWLIST_UNLOCK(&faxmodules);
if (!faxmod) {
ast_log(LOG_ERROR, "Could not locate a FAX technology module with capabilities (0x%X)\n", details->caps);
ao2_ref(s, -1);
return NULL;
}
if (!s->tech->reserve_session) {
ast_debug(1, "Selected FAX technology module (%s) does not support reserving sessions.\n", s->tech->description);
return s;
}
if (!(*token = s->tech->reserve_session(s))) {
ao2_ref(s, -1);
return NULL;
}
s->state = AST_FAX_STATE_RESERVED;
ast_atomic_fetchadd_int(&faxregistry.reserved_sessions, 1);
return s;
}
/*! \brief create a FAX session
*
* \param details details for the session
* \param chan the channel the session will run on
* \param reserved a reserved session to base this session on (can be NULL)
* \param token the token for a reserved session (can be NULL)
*
* Create a new fax session based on the given details structure.
*
* \note The given token is always consumed (by tech->new_session() or by
* fax_session_release() in the event of a failure). The given reference to a
* reserved session is never consumed and must be dereferenced separately from
* the reference returned by this function.
*
* \return NULL or a reference to a new fax session
*/
static struct ast_fax_session *fax_session_new(struct ast_fax_session_details *details, struct ast_channel *chan, struct ast_fax_session *reserved, struct ast_fax_tech_token *token)
{
struct ast_fax_session *s = NULL;
struct fax_module *faxmod;
if (reserved) {
s = reserved;
ao2_ref(reserved, +1);
/* NOTE: we don't consume the reference to the reserved
* session. The session returned from fax_session_new() is a
* new reference and must be derefed in addition to the
* reserved session.
*/
if (s->state == AST_FAX_STATE_RESERVED) {
ast_atomic_fetchadd_int(&faxregistry.reserved_sessions, -1);
s->state = AST_FAX_STATE_UNINITIALIZED;
}
}
if (!s && !(s = ao2_alloc(sizeof(*s), destroy_session))) {
return NULL;
}
ast_atomic_fetchadd_int(&faxregistry.active_sessions, 1);
s->state = AST_FAX_STATE_UNINITIALIZED;
if (details->option.debug && (details->caps & AST_FAX_TECH_AUDIO)) {
if (!(s->debug_info = ast_calloc(1, sizeof(*(s->debug_info))))) {
fax_session_release(s, token);
ao2_ref(s, -1);
return NULL;
}
if (!(s->debug_info->dsp = ast_dsp_new())) {
ast_free(s->debug_info);
s->debug_info = NULL;
fax_session_release(s, token);
ao2_ref(s, -1);
return NULL;
}
ast_dsp_set_threshold(s->debug_info->dsp, 128);
}
if (!(s->channame = ast_strdup(chan->name))) {
fax_session_release(s, token);
ao2_ref(s, -1);
return NULL;
}
if (!(s->chan_uniqueid = ast_strdup(chan->uniqueid))) {
fax_session_release(s, token);
ao2_ref(s, -1);
return NULL;
}
s->chan = chan;
if (!s->details) {
s->details = details;
ao2_ref(s->details, 1);
}
details->id = s->id = ast_atomic_fetchadd_int(&faxregistry.nextsessionname, 1);
if (!token) {
/* locate a FAX technology module that can handle said requirements */
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, faxmod, list) {
if ((faxmod->tech->caps & details->caps) != details->caps) {
continue;
}
ast_debug(4, "Requesting a new FAX session from '%s'.\n", faxmod->tech->description);
ast_module_ref(faxmod->tech->module);
s->tech = faxmod->tech;
break;
}
AST_RWLIST_UNLOCK(&faxmodules);
if (!faxmod) {
ast_log(LOG_ERROR, "Could not locate a FAX technology module with capabilities (0x%X)\n", details->caps);
ao2_ref(s, -1);
return NULL;
}
}
if (!(s->tech_pvt = s->tech->new_session(s, token))) {
ast_log(LOG_ERROR, "FAX session failed to initialize.\n");
ao2_ref(s, -1);
return NULL;
}
/* link the session to the session container */
if (!(ao2_link(faxregistry.container, s))) {
ast_log(LOG_ERROR, "failed to add FAX session '%d' to container.\n", s->id);
ao2_ref(s, -1);
return NULL;
}
ast_debug(4, "channel '%s' using FAX session '%d'\n", s->channame, s->id);
return s;
}
static void get_manager_event_info(struct ast_channel *chan, struct manager_event_info *info)
{
pbx_substitute_variables_helper(chan, "${CONTEXT}", info->context, sizeof(info->context));
pbx_substitute_variables_helper(chan, "${EXTEN}", info->exten, sizeof(info->exten));
pbx_substitute_variables_helper(chan, "${CALLERID(num)}", info->cid, sizeof(info->cid));
}
/* \brief Generate a string of filenames using the given prefix and separator.
* \param details the fax session details
* \param prefix the prefix to each filename
* \param separator the separator between filenames
*
* This function generates a string of filenames from the given details
* structure and using the given prefix and separator.
*
* \retval NULL there was an error generating the string
* \return the string generated string
*/
static char *generate_filenames_string(struct ast_fax_session_details *details, char *prefix, char *separator)
{
char *filenames, *c;
size_t size = 0;
int first = 1;
struct ast_fax_document *doc;
/* don't process empty lists */
if (AST_LIST_EMPTY(&details->documents)) {
return NULL;
}
/* Calculate the total length of all of the file names */
AST_LIST_TRAVERSE(&details->documents, doc, next) {
size += strlen(separator) + strlen(prefix) + strlen(doc->filename);
}
size += 1; /* add space for the terminating null */
if (!(filenames = ast_malloc(size))) {
return NULL;
}
c = filenames;
ast_build_string(&c, &size, "%s%s", prefix, AST_LIST_FIRST(&details->documents)->filename);
AST_LIST_TRAVERSE(&details->documents, doc, next) {
if (first) {
first = 0;
continue;
}
ast_build_string(&c, &size, "%s%s%s", separator, prefix, doc->filename);
}
return filenames;
}
/*! \brief send a FAX status manager event */
static int report_fax_status(struct ast_channel *chan, struct ast_fax_session_details *details, const char *status)
{
char *filenames = generate_filenames_string(details, "FileName: ", "\r\n");
ast_channel_lock(chan);
if (details->option.statusevents) {
struct manager_event_info info;
get_manager_event_info(chan, &info);
manager_event(EVENT_FLAG_CALL,
"FAXStatus",
"Operation: %s\r\n"
"Status: %s\r\n"
"Channel: %s\r\n"
"Context: %s\r\n"
"Exten: %s\r\n"
"CallerID: %s\r\n"
"LocalStationID: %s\r\n"
"%s%s",
(details->caps & AST_FAX_TECH_GATEWAY) ? "gateway" : (details->caps & AST_FAX_TECH_RECEIVE) ? "receive" : "send",
status,
chan->name,
info.context,
info.exten,
info.cid,
details->localstationid,
S_OR(filenames, ""),
filenames ? "\r\n" : "");
}
ast_channel_unlock(chan);
if (filenames) {
ast_free(filenames);
}
return 0;
}
/*! \brief Set fax related channel variables. */
static void set_channel_variables(struct ast_channel *chan, struct ast_fax_session_details *details)
{
char buf[10];
pbx_builtin_setvar_helper(chan, "FAXSTATUS", S_OR(details->result, NULL));
pbx_builtin_setvar_helper(chan, "FAXERROR", S_OR(details->error, NULL));
pbx_builtin_setvar_helper(chan, "FAXSTATUSSTRING", S_OR(details->resultstr, NULL));
pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", S_OR(details->remotestationid, NULL));
pbx_builtin_setvar_helper(chan, "LOCALSTATIONID", S_OR(details->localstationid, NULL));
pbx_builtin_setvar_helper(chan, "FAXBITRATE", S_OR(details->transfer_rate, NULL));
pbx_builtin_setvar_helper(chan, "FAXRESOLUTION", S_OR(details->resolution, NULL));
snprintf(buf, sizeof(buf), "%d", details->pages_transferred);
pbx_builtin_setvar_helper(chan, "FAXPAGES", buf);
}
#define GENERIC_FAX_EXEC_SET_VARS(fax, chan, errorstr, reason) \
do { \
if (ast_strlen_zero(fax->details->result)) \
ast_string_field_set(fax->details, result, "FAILED"); \
if (ast_strlen_zero(fax->details->resultstr)) \
ast_string_field_set(fax->details, resultstr, reason); \
if (ast_strlen_zero(fax->details->error)) \
ast_string_field_set(fax->details, error, errorstr); \
set_channel_variables(chan, fax->details); \
} while (0)
#define GENERIC_FAX_EXEC_ERROR_QUIET(fax, chan, errorstr, reason) \
do { \
GENERIC_FAX_EXEC_SET_VARS(fax, chan, errorstr, reason); \
res = ms = -1; \
} while (0)
#define GENERIC_FAX_EXEC_ERROR(fax, chan, errorstr, reason) \
do { \
ast_log(LOG_ERROR, "channel '%s' FAX session '%d' failure, reason: '%s' (%s)\n", chan->name, fax->id, reason, errorstr); \
GENERIC_FAX_EXEC_ERROR_QUIET(fax, chan, errorstr, reason); \
} while (0)
static int set_fax_t38_caps(struct ast_channel *chan, struct ast_fax_session_details *details)
{
switch (ast_channel_get_t38_state(chan)) {
case T38_STATE_UNKNOWN:
details->caps |= AST_FAX_TECH_T38;
break;
case T38_STATE_REJECTED:
case T38_STATE_UNAVAILABLE:
details->caps |= AST_FAX_TECH_AUDIO;
break;
case T38_STATE_NEGOTIATED:
/* already in T.38 mode? This should not happen. */
case T38_STATE_NEGOTIATING: {
/* the other end already sent us a T.38 reinvite, so we need to prod the channel
* driver into resending their parameters to us if it supports doing so... if
* not, we can't proceed, because we can't create a proper reply without them.
* if it does work, the channel driver will send an AST_CONTROL_T38_PARAMETERS
* with a request of AST_T38_REQUEST_NEGOTIATE, which will be read by the function
* that gets called after this one completes
*/
struct ast_control_t38_parameters parameters = { .request_response = AST_T38_REQUEST_PARMS, };
if (ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &parameters, sizeof(parameters)) != AST_T38_REQUEST_PARMS) {
ast_log(LOG_ERROR, "channel '%s' is in an unsupported T.38 negotiation state, cannot continue.\n", chan->name);
return -1;
}
details->caps |= AST_FAX_TECH_T38;
break;
}
default:
ast_log(LOG_ERROR, "channel '%s' is in an unsupported T.38 negotiation state, cannot continue.\n", chan->name);
return -1;
}
return 0;
}
static int disable_t38(struct ast_channel *chan)
{
int ms;
struct ast_frame *frame = NULL;
struct ast_control_t38_parameters t38_parameters = { .request_response = AST_T38_REQUEST_TERMINATE, };
ast_debug(1, "Shutting down T.38 on %s\n", chan->name);
if (ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters)) != 0) {
ast_debug(1, "error while disabling T.38 on channel '%s'\n", chan->name);
return -1;
}
/* wait up to five seconds for negotiation to complete */
ms = 5000;
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_debug(1, "error while disabling T.38 on channel '%s'\n", chan->name);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
ast_debug(1, "channel '%s' timed-out during T.38 shutdown\n", chan->name);
break;
}
if (!(frame = ast_read(chan))) {
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_TERMINATED:
ast_debug(1, "Shut down T.38 on %s\n", chan->name);
break;
case AST_T38_REFUSED:
ast_log(LOG_WARNING, "channel '%s' refused to disable T.38\n", chan->name);
ast_frfree(frame);
return -1;
default:
ast_log(LOG_ERROR, "channel '%s' failed to disable T.38\n", chan->name);
ast_frfree(frame);
return -1;
}
ast_frfree(frame);
break;
}
ast_frfree(frame);
}
return 0;
}
/*! \brief this is the generic FAX session handling function */
static int generic_fax_exec(struct ast_channel *chan, struct ast_fax_session_details *details, struct ast_fax_session *reserved, struct ast_fax_tech_token *token)
{
int ms;
int timeout = RES_FAX_TIMEOUT;
int res = 0, chancount;
unsigned int expected_frametype = -1;
union ast_frame_subclass expected_framesubclass = { .integer = -1 };
unsigned int t38negotiated = (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED);
struct ast_control_t38_parameters t38_parameters;
const char *tempvar;
struct ast_fax_session *fax = NULL;
struct ast_frame *frame = NULL;
struct ast_channel *c = chan;
struct ast_format orig_write_format;
struct ast_format orig_read_format;
ast_format_clear(&orig_write_format);
ast_format_clear(&orig_read_format);
chancount = 1;
/* create the FAX session */
if (!(fax = fax_session_new(details, chan, reserved, token))) {
ast_log(LOG_ERROR, "Can't create a FAX session, FAX attempt failed.\n");
report_fax_status(chan, details, "No Available Resource");
return -1;
}
ast_channel_lock(chan);
/* update session details */
if (ast_strlen_zero(details->headerinfo) && (tempvar = pbx_builtin_getvar_helper(chan, "LOCALHEADERINFO"))) {
ast_string_field_set(details, headerinfo, tempvar);
}
if (ast_strlen_zero(details->localstationid)) {
tempvar = pbx_builtin_getvar_helper(chan, "LOCALSTATIONID");
ast_string_field_set(details, localstationid, tempvar ? tempvar : "unknown");
}
ast_channel_unlock(chan);
report_fax_status(chan, details, "Allocating Resources");
if (details->caps & AST_FAX_TECH_AUDIO) {
expected_frametype = AST_FRAME_VOICE;;
ast_format_set(&expected_framesubclass.format, AST_FORMAT_SLINEAR, 0);
ast_format_copy(&orig_write_format, &chan->writeformat);
if (ast_set_write_format_by_id(chan, AST_FORMAT_SLINEAR) < 0) {
ast_log(LOG_ERROR, "channel '%s' failed to set write format to signed linear'.\n", chan->name);
ao2_lock(faxregistry.container);
ao2_unlink(faxregistry.container, fax);
ao2_unlock(faxregistry.container);
ao2_ref(fax, -1);
ast_channel_unlock(chan);
return -1;
}
ast_format_copy(&orig_read_format, &chan->readformat);
if (ast_set_read_format_by_id(chan, AST_FORMAT_SLINEAR) < 0) {
ast_log(LOG_ERROR, "channel '%s' failed to set read format to signed linear.\n", chan->name);
ao2_lock(faxregistry.container);
ao2_unlink(faxregistry.container, fax);
ao2_unlock(faxregistry.container);
ao2_ref(fax, -1);
ast_channel_unlock(chan);
return -1;
}
if (fax->smoother) {
ast_smoother_free(fax->smoother);
fax->smoother = NULL;
}
if (!(fax->smoother = ast_smoother_new(320))) {
ast_log(LOG_WARNING, "Channel '%s' FAX session '%d' failed to obtain a smoother.\n", chan->name, fax->id);
}
} else {
expected_frametype = AST_FRAME_MODEM;
expected_framesubclass.integer = AST_MODEM_T38;
}
if (fax->debug_info) {
fax->debug_info->base_tv = ast_tvnow();
}
/* reset our result fields just in case the fax tech driver wants to
* set custom error messages */
ast_string_field_set(details, result, "");
ast_string_field_set(details, resultstr, "");
ast_string_field_set(details, error, "");
set_channel_variables(chan, details);
if (fax->tech->start_session(fax) < 0) {
GENERIC_FAX_EXEC_ERROR(fax, chan, "INIT_ERROR", "failed to start FAX session");
}
report_fax_status(chan, details, "FAX Transmission In Progress");
ast_debug(5, "channel %s will wait on FAX fd %d\n", chan->name, fax->fd);
/* handle frames for the session */
ms = 1000;
while ((res > -1) && (ms > -1) && (timeout > 0)) {
struct ast_channel *ready_chan;
int ofd, exception;
ms = 1000;
errno = 0;
ready_chan = ast_waitfor_nandfds(&c, chancount, &fax->fd, 1, &exception, &ofd, &ms);
if (ready_chan) {
if (!(frame = ast_read(chan))) {
/* the channel is probably gone, so lets stop polling on it and let the
* FAX session complete before we exit the application. if needed,
* send the FAX stack silence so the modems can finish their session without
* any problems */
ast_debug(1, "Channel '%s' did not return a frame; probably hung up.\n", chan->name);
GENERIC_FAX_EXEC_SET_VARS(fax, chan, "HANGUP", "remote channel hungup");
c = NULL;
chancount = 0;
timeout -= (1000 - ms);
fax->tech->cancel_session(fax);
if (fax->tech->generate_silence) {
fax->tech->generate_silence(fax);
}
continue;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
unsigned int was_t38 = t38negotiated;
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
/* the other end has requested a switch to T.38, so reply that we are willing, if we can
* do T.38 as well
*/
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = (details->caps & AST_FAX_TECH_T38) ? AST_T38_NEGOTIATED : AST_T38_REFUSED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
break;
case AST_T38_NEGOTIATED:
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
t38negotiated = 1;
break;
default:
break;
}
if (t38negotiated && !was_t38) {
fax->tech->switch_to_t38(fax);
details->caps &= ~AST_FAX_TECH_AUDIO;
expected_frametype = AST_FRAME_MODEM;
expected_framesubclass.integer = AST_MODEM_T38;
if (fax->smoother) {
ast_smoother_free(fax->smoother);
fax->smoother = NULL;
}
report_fax_status(chan, details, "T.38 Negotiated");
ast_verb(3, "Channel '%s' switched to T.38 FAX session '%d'.\n", chan->name, fax->id);
}
} else if ((frame->frametype == expected_frametype) &&
(!memcmp(&frame->subclass, &expected_framesubclass, sizeof(frame->subclass)))) {
struct ast_frame *f;
if (fax->smoother) {
/* push the frame into a smoother */
if (ast_smoother_feed(fax->smoother, frame) < 0) {
GENERIC_FAX_EXEC_ERROR(fax, chan, "UNKNOWN", "Failed to feed the smoother");
}
while ((f = ast_smoother_read(fax->smoother)) && (f->data.ptr)) {
if (fax->debug_info) {
debug_check_frame_for_silence(fax, 1, f);
}
/* write the frame to the FAX stack */
fax->tech->write(fax, f);
fax->frames_received++;
if (f != frame) {
ast_frfree(f);
}
}
} else {
/* write the frame to the FAX stack */
fax->tech->write(fax, frame);
fax->frames_received++;
}
timeout = RES_FAX_TIMEOUT;
}
ast_frfree(frame);
} else if (ofd == fax->fd) {
/* read a frame from the FAX stack and send it out the channel.
* the FAX stack will return a NULL if the FAX session has already completed */
if (!(frame = fax->tech->read(fax))) {
break;
}
if (fax->debug_info && (frame->frametype == AST_FRAME_VOICE)) {
debug_check_frame_for_silence(fax, 0, frame);
}
ast_write(chan, frame);
fax->frames_sent++;
ast_frfree(frame);
timeout = RES_FAX_TIMEOUT;
} else {
if (ms && (ofd < 0)) {
if ((errno == 0) || (errno == EINTR)) {
timeout -= (1000 - ms);
if (timeout <= 0)
GENERIC_FAX_EXEC_ERROR(fax, chan, "TIMEOUT", "fax session timed-out");
continue;
} else {
ast_log(LOG_WARNING, "something bad happened while channel '%s' was polling.\n", chan->name);
GENERIC_FAX_EXEC_ERROR(fax, chan, "UNKNOWN", "error polling data");
res = ms;
break;
}
} else {
/* nothing happened */
if (timeout > 0) {
timeout -= 1000;
if (timeout <= 0)
GENERIC_FAX_EXEC_ERROR(fax, chan, "TIMEOUT", "fax session timed-out");
continue;
} else {
ast_log(LOG_WARNING, "channel '%s' timed-out during the FAX transmission.\n", chan->name);
GENERIC_FAX_EXEC_ERROR(fax, chan, "TIMEOUT", "fax session timed-out");
break;
}
}
}
}
ast_debug(3, "channel '%s' - event loop stopped { timeout: %d, ms: %d, res: %d }\n", chan->name, timeout, ms, res);
set_channel_variables(chan, details);
ast_atomic_fetchadd_int(&faxregistry.fax_complete, 1);
if (!strcasecmp(details->result, "FAILED")) {
ast_atomic_fetchadd_int(&faxregistry.fax_failures, 1);
}
if (fax) {
ao2_lock(faxregistry.container);
ao2_unlink(faxregistry.container, fax);
ao2_unlock(faxregistry.container);
ao2_ref(fax, -1);
}
/* if the channel is still alive, and we changed its read/write formats,
* restore them now
*/
if (chancount) {
if (orig_read_format.id) {
ast_set_read_format(chan, &orig_read_format);
}
if (orig_write_format.id) {
ast_set_write_format(chan, &orig_write_format);
}
}
/* return the chancount so the calling function can determine if the channel hungup during this FAX session or not */
return chancount;
}
static int receivefax_t38_init(struct ast_channel *chan, struct ast_fax_session_details *details)
{
int ms;
struct ast_frame *frame = NULL;
struct ast_control_t38_parameters t38_parameters;
/* don't send any audio if we've already received a T.38 reinvite */
if (ast_channel_get_t38_state(chan) != T38_STATE_NEGOTIATING) {
/* generate 3 seconds of CED */
if (ast_playtones_start(chan, 1024, "!2100/3000", 1)) {
ast_log(LOG_ERROR, "error generating CED tone on %s\n", chan->name);
return -1;
}
ms = 3000;
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_log(LOG_ERROR, "error while generating CED tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
break;
}
if (!(frame = ast_read(chan))) {
ast_log(LOG_ERROR, "error reading frame while generating CED tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
/* the other end has requested a switch to T.38, so reply that we are willing, if we can
* do T.38 as well
*/
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = (details->caps & AST_FAX_TECH_T38) ? AST_T38_NEGOTIATED : AST_T38_REFUSED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
ast_playtones_stop(chan);
break;
case AST_T38_NEGOTIATED:
ast_debug(1, "Negotiated T.38 for receive on %s\n", chan->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
details->caps &= ~AST_FAX_TECH_AUDIO;
report_fax_status(chan, details, "T.38 Negotiated");
break;
default:
break;
}
}
ast_frfree(frame);
}
ast_playtones_stop(chan);
}
/* if T.38 was negotiated, we are done initializing */
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
return 0;
}
/* request T.38 */
ast_debug(1, "Negotiating T.38 for receive on %s\n", chan->name);
/* wait up to five seconds for negotiation to complete */
ms = 5000;
/* set parameters based on the session's parameters */
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = AST_T38_REQUEST_NEGOTIATE;
if ((ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters)) != 0)) {
return -1;
}
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_log(LOG_WARNING, "error on '%s' while waiting for T.38 negotiation.\n", chan->name);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
ast_log(LOG_WARNING, "channel '%s' timed-out during the T.38 negotiation.\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
break;
}
if (!(frame = ast_read(chan))) {
ast_log(LOG_WARNING, "error on '%s' while waiting for T.38 negotiation.\n", chan->name);
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = AST_T38_NEGOTIATED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
break;
case AST_T38_NEGOTIATED:
ast_debug(1, "Negotiated T.38 for receive on %s\n", chan->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
details->caps &= ~AST_FAX_TECH_AUDIO;
report_fax_status(chan, details, "T.38 Negotiated");
ms = 0;
break;
case AST_T38_REFUSED:
ast_log(LOG_WARNING, "channel '%s' refused to negotiate T.38\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
ms = 0;
break;
default:
ast_log(LOG_ERROR, "channel '%s' failed to negotiate T.38\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
ms = 0;
break;
}
}
ast_frfree(frame);
}
/* if T.38 was negotiated, we are done initializing */
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
return 0;
}
/* if we made it here, then T.38 failed, check the 'f' flag */
if (details->option.allow_audio != AST_FAX_OPTFLAG_TRUE) {
ast_log(LOG_WARNING, "Audio FAX not allowed on channel '%s' and T.38 negotiation failed; aborting.\n", chan->name);
return -1;
}
/* ok, audio fallback is allowed */
details->caps |= AST_FAX_TECH_AUDIO;
return 0;
}
/*! \brief initiate a receive FAX session */
static int receivefax_exec(struct ast_channel *chan, const char *data)
{
char *parse, modems[128] = "";
int channel_alive;
struct ast_fax_session_details *details;
struct ast_fax_session *s;
struct ast_fax_tech_token *token = NULL;
struct ast_fax_document *doc;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(filename);
AST_APP_ARG(options);
);
struct ast_flags opts = { 0, };
struct manager_event_info info;
enum ast_t38_state t38state;
/* initialize output channel variables */
pbx_builtin_setvar_helper(chan, "FAXSTATUS", "FAILED");
pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", NULL);
pbx_builtin_setvar_helper(chan, "LOCALSTATIONID", NULL);
pbx_builtin_setvar_helper(chan, "FAXPAGES", "0");
pbx_builtin_setvar_helper(chan, "FAXBITRATE", NULL);
pbx_builtin_setvar_helper(chan, "FAXRESOLUTION", NULL);
/* Get a FAX session details structure from the channel's FAX datastore and create one if
* it does not already exist. */
if (!(details = find_or_create_details(chan))) {
pbx_builtin_setvar_helper(chan, "FAXERROR", "MEMORY_ERROR");
pbx_builtin_setvar_helper(chan, "FAXSTATUSSTRING", "error allocating memory");
ast_log(LOG_ERROR, "System cannot provide memory for session requirements.\n");
return -1;
}
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error starting fax session");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
if (details->caps & AST_FAX_TECH_GATEWAY) {
ast_string_field_set(details, resultstr, "can't receive a fax on a channel with a T.38 gateway");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "executing ReceiveFAX on a channel with a T.38 Gateway is not supported\n");
ao2_ref(details, -1);
return -1;
}
if (details->maxrate < details->minrate) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "maxrate is less than minrate");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "maxrate %d is less than minrate %d\n", details->maxrate, details->minrate);
ao2_ref(details, -1);
return -1;
}
if (check_modem_rate(details->modems, details->minrate)) {
ast_fax_modem_to_str(details->modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'minrate' setting %d\n", modems, details->minrate);
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "incompatible 'modems' and 'minrate' settings");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (check_modem_rate(details->modems, details->maxrate)) {
ast_fax_modem_to_str(details->modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'maxrate' setting %d\n", modems, details->maxrate);
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "incompatible 'modems' and 'maxrate' settings");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (ast_strlen_zero(data)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s requires an argument (filename[,options])\n", app_receivefax);
ao2_ref(details, -1);
return -1;
}
parse = ast_strdupa(data);
AST_STANDARD_APP_ARGS(args, parse);
if (!ast_strlen_zero(args.options) &&
ast_app_parse_options(fax_exec_options, &opts, NULL, args.options)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (ast_strlen_zero(args.filename)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s requires an argument (filename[,options])\n", app_receivefax);
ao2_ref(details, -1);
return -1;
}
/* check for unsupported FAX application options */
if (ast_test_flag(&opts, OPT_CALLERMODE) || ast_test_flag(&opts, OPT_CALLEDMODE)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s does not support polling\n", app_receivefax);
ao2_ref(details, -1);
return -1;
}
ast_atomic_fetchadd_int(&faxregistry.fax_rx_attempts, 1);
pbx_builtin_setvar_helper(chan, "FAXERROR", "Channel Problems");
pbx_builtin_setvar_helper(chan, "FAXSTATUSSTRING", "Error before FAX transmission started.");
if (!(doc = ast_calloc(1, sizeof(*doc) + strlen(args.filename) + 1))) {
ast_string_field_set(details, error, "MEMORY_ERROR");
ast_string_field_set(details, resultstr, "error allocating memory");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "System cannot provide memory for session requirements.\n");
ao2_ref(details, -1);
return -1;
}
strcpy(doc->filename, args.filename);
AST_LIST_INSERT_TAIL(&details->documents, doc, next);
ast_verb(3, "Channel '%s' receiving FAX '%s'\n", chan->name, args.filename);
details->caps = AST_FAX_TECH_RECEIVE;
/* check for debug */
if (ast_test_flag(&opts, OPT_DEBUG) || global_fax_debug) {
details->option.debug = AST_FAX_OPTFLAG_TRUE;
}
/* check for request for status events */
if (ast_test_flag(&opts, OPT_STATUS)) {
details->option.statusevents = AST_FAX_OPTFLAG_TRUE;
}
t38state = ast_channel_get_t38_state(chan);
if ((t38state == T38_STATE_UNAVAILABLE) || (t38state == T38_STATE_REJECTED) ||
ast_test_flag(&opts, OPT_ALLOWAUDIO) ||
ast_test_flag(&opts, OPT_FORCE_AUDIO)) {
details->option.allow_audio = AST_FAX_OPTFLAG_TRUE;
}
if (!(s = fax_session_reserve(details, &token))) {
ast_string_field_set(details, resultstr, "error reserving fax session");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "Unable to reserve FAX session.\n");
ao2_ref(details, -1);
return -1;
}
/* make sure the channel is up */
if (chan->_state != AST_STATE_UP) {
if (ast_answer(chan)) {
ast_string_field_set(details, resultstr, "error answering channel");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "Channel '%s' failed answer attempt.\n", chan->name);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
return -1;
}
}
if (!ast_test_flag(&opts, OPT_FORCE_AUDIO)) {
if (set_fax_t38_caps(chan, details)) {
ast_string_field_set(details, error, "T38_NEG_ERROR");
ast_string_field_set(details, resultstr, "error negotiating T.38");
set_channel_variables(chan, details);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
return -1;
}
} else {
details->caps |= AST_FAX_TECH_AUDIO;
}
if (!ast_test_flag(&opts, OPT_FORCE_AUDIO) && (details->caps & AST_FAX_TECH_T38)) {
if (receivefax_t38_init(chan, details)) {
ast_string_field_set(details, error, "T38_NEG_ERROR");
ast_string_field_set(details, resultstr, "error negotiating T.38");
set_channel_variables(chan, details);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
ast_log(LOG_ERROR, "error initializing channel '%s' in T.38 mode\n", chan->name);
return -1;
}
} else {
details->option.send_ced = 1;
}
if ((channel_alive = generic_fax_exec(chan, details, s, token)) < 0) {
ast_atomic_fetchadd_int(&faxregistry.fax_failures, 1);
}
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
if (disable_t38(chan)) {
ast_debug(1, "error disabling T.38 mode on %s\n", chan->name);
}
}
/* send out the AMI completion event */
ast_channel_lock(chan);
get_manager_event_info(chan, &info);
manager_event(EVENT_FLAG_CALL,
"ReceiveFAX",
"Channel: %s\r\n"
"Context: %s\r\n"
"Exten: %s\r\n"
"CallerID: %s\r\n"
"RemoteStationID: %s\r\n"
"LocalStationID: %s\r\n"
"PagesTransferred: %s\r\n"
"Resolution: %s\r\n"
"TransferRate: %s\r\n"
"FileName: %s\r\n",
chan->name,
info.context,
info.exten,
info.cid,
S_OR(pbx_builtin_getvar_helper(chan, "REMOTESTATIONID"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "LOCALSTATIONID"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXPAGES"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXRESOLUTION"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXBITRATE"), ""),
args.filename);
ast_channel_unlock(chan);
ao2_ref(s, -1);
ao2_ref(details, -1);
/* If the channel hungup return -1; otherwise, return 0 to continue in the dialplan */
return (!channel_alive) ? -1 : 0;
}
static int sendfax_t38_init(struct ast_channel *chan, struct ast_fax_session_details *details)
{
int ms;
struct ast_frame *frame = NULL;
struct ast_control_t38_parameters t38_parameters;
/* send CNG tone while listening for the receiver to initiate a switch
* to T.38 mode; if they do, stop sending the CNG tone and proceed with
* the switch.
*
* 10500 is enough time for 3 CNG tones
*/
ms = 10500;
/* don't send any audio if we've already received a T.38 reinvite */
if (ast_channel_get_t38_state(chan) != T38_STATE_NEGOTIATING) {
if (ast_playtones_start(chan, 1024, "!1100/500,!0/3000,!1100/500,!0/3000,!1100/500,!0/3000", 1)) {
ast_log(LOG_ERROR, "error generating CNG tone on %s\n", chan->name);
return -1;
}
}
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_log(LOG_ERROR, "error while generating CNG tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
break;
}
if (!(frame = ast_read(chan))) {
ast_log(LOG_ERROR, "error reading frame while generating CNG tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
/* the other end has requested a switch to T.38, so reply that we are willing, if we can
* do T.38 as well
*/
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = (details->caps & AST_FAX_TECH_T38) ? AST_T38_NEGOTIATED : AST_T38_REFUSED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
ast_playtones_stop(chan);
break;
case AST_T38_NEGOTIATED:
ast_debug(1, "Negotiated T.38 for send on %s\n", chan->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
details->caps &= ~AST_FAX_TECH_AUDIO;
report_fax_status(chan, details, "T.38 Negotiated");
ms = 0;
break;
default:
break;
}
}
ast_frfree(frame);
}
ast_playtones_stop(chan);
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
return 0;
}
/* T.38 negotiation did not happen, initiate a switch if requested */
if (details->option.request_t38 == AST_FAX_OPTFLAG_TRUE) {
ast_debug(1, "Negotiating T.38 for send on %s\n", chan->name);
/* wait up to five seconds for negotiation to complete */
ms = 5000;
/* set parameters based on the session's parameters */
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = AST_T38_REQUEST_NEGOTIATE;
if ((ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters)) != 0)) {
return -1;
}
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_log(LOG_WARNING, "error on '%s' while waiting for T.38 negotiation.\n", chan->name);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
ast_log(LOG_WARNING, "channel '%s' timed-out during the T.38 negotiation.\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
break;
}
if (!(frame = ast_read(chan))) {
ast_log(LOG_WARNING, "error on '%s' while waiting for T.38 negotiation.\n", chan->name);
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = AST_T38_NEGOTIATED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
break;
case AST_T38_NEGOTIATED:
ast_debug(1, "Negotiated T.38 for receive on %s\n", chan->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
details->caps &= ~AST_FAX_TECH_AUDIO;
report_fax_status(chan, details, "T.38 Negotiated");
ms = 0;
break;
case AST_T38_REFUSED:
ast_log(LOG_WARNING, "channel '%s' refused to negotiate T.38\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
ms = 0;
break;
default:
ast_log(LOG_ERROR, "channel '%s' failed to negotiate T.38\n", chan->name);
details->caps &= ~AST_FAX_TECH_T38;
ms = 0;
break;
}
}
ast_frfree(frame);
}
/* if T.38 was negotiated, we are done initializing */
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
return 0;
}
/* send one more CNG tone to get audio going again for some
* carriers if we are going to fall back to audio mode */
if (details->option.allow_audio == AST_FAX_OPTFLAG_TRUE) {
if (ast_playtones_start(chan, 1024, "!1100/500,!0/3000", 1)) {
ast_log(LOG_ERROR, "error generating second CNG tone on %s\n", chan->name);
return -1;
}
ms = 3500;
while (ms > 0) {
ms = ast_waitfor(chan, ms);
if (ms < 0) {
ast_log(LOG_ERROR, "error while generating second CNG tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if (ms == 0) { /* all done, nothing happened */
break;
}
if (!(frame = ast_read(chan))) {
ast_log(LOG_ERROR, "error reading frame while generating second CNG tone on %s\n", chan->name);
ast_playtones_stop(chan);
return -1;
}
if ((frame->frametype == AST_FRAME_CONTROL) &&
(frame->subclass.integer == AST_CONTROL_T38_PARAMETERS) &&
(frame->datalen == sizeof(t38_parameters))) {
struct ast_control_t38_parameters *parameters = frame->data.ptr;
switch (parameters->request_response) {
case AST_T38_REQUEST_NEGOTIATE:
/* the other end has requested a switch to T.38, so reply that we are willing, if we can
* do T.38 as well
*/
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
t38_parameters.request_response = (details->caps & AST_FAX_TECH_T38) ? AST_T38_NEGOTIATED : AST_T38_REFUSED;
ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, &t38_parameters, sizeof(t38_parameters));
ast_playtones_stop(chan);
break;
case AST_T38_NEGOTIATED:
ast_debug(1, "Negotiated T.38 for send on %s\n", chan->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, parameters);
details->caps &= ~AST_FAX_TECH_AUDIO;
report_fax_status(chan, details, "T.38 Negotiated");
ms = 0;
break;
default:
break;
}
}
ast_frfree(frame);
}
ast_playtones_stop(chan);
/* if T.38 was negotiated, we are done initializing */
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
return 0;
}
}
}
/* if we made it here, then T.38 failed, check the 'f' flag */
if (details->option.allow_audio == AST_FAX_OPTFLAG_FALSE) {
ast_log(LOG_WARNING, "Audio FAX not allowed on channel '%s' and T.38 negotiation failed; aborting.\n", chan->name);
return -1;
}
/* ok, audio fallback is allowed */
details->caps |= AST_FAX_TECH_AUDIO;
return 0;
}
/*! \brief initiate a send FAX session */
static int sendfax_exec(struct ast_channel *chan, const char *data)
{
char *parse, *filenames, *c, modems[128] = "";
int channel_alive, file_count;
struct ast_fax_session_details *details;
struct ast_fax_session *s;
struct ast_fax_tech_token *token = NULL;
struct ast_fax_document *doc;
AST_DECLARE_APP_ARGS(args,
AST_APP_ARG(filenames);
AST_APP_ARG(options);
);
struct ast_flags opts = { 0, };
struct manager_event_info info;
enum ast_t38_state t38state;
/* initialize output channel variables */
pbx_builtin_setvar_helper(chan, "FAXSTATUS", "FAILED");
pbx_builtin_setvar_helper(chan, "REMOTESTATIONID", NULL);
pbx_builtin_setvar_helper(chan, "LOCALSTATIONID", NULL);
pbx_builtin_setvar_helper(chan, "FAXPAGES", "0");
pbx_builtin_setvar_helper(chan, "FAXBITRATE", NULL);
pbx_builtin_setvar_helper(chan, "FAXRESOLUTION", NULL);
/* Get a requirement structure and set it. This structure is used
* to tell the FAX technology module about the higher level FAX session */
if (!(details = find_or_create_details(chan))) {
pbx_builtin_setvar_helper(chan, "FAXERROR", "MEMORY_ERROR");
pbx_builtin_setvar_helper(chan, "FAXSTATUSSTRING", "error allocating memory");
ast_log(LOG_ERROR, "System cannot provide memory for session requirements.\n");
return -1;
}
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error starting fax session");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
if (details->caps & AST_FAX_TECH_GATEWAY) {
ast_string_field_set(details, resultstr, "can't send a fax on a channel with a T.38 gateway");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "executing SendFAX on a channel with a T.38 Gateway is not supported\n");
ao2_ref(details, -1);
return -1;
}
if (details->maxrate < details->minrate) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "maxrate is less than minrate");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "maxrate %d is less than minrate %d\n", details->maxrate, details->minrate);
ao2_ref(details, -1);
return -1;
}
if (check_modem_rate(details->modems, details->minrate)) {
ast_fax_modem_to_str(details->modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'minrate' setting %d\n", modems, details->minrate);
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "incompatible 'modems' and 'minrate' settings");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (check_modem_rate(details->modems, details->maxrate)) {
ast_fax_modem_to_str(details->modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'maxrate' setting %d\n", modems, details->maxrate);
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "incompatible 'modems' and 'maxrate' settings");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (ast_strlen_zero(data)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s requires an argument (filename[&filename[&filename]][,options])\n", app_sendfax);
ao2_ref(details, -1);
return -1;
}
parse = ast_strdupa(data);
AST_STANDARD_APP_ARGS(args, parse);
if (!ast_strlen_zero(args.options) &&
ast_app_parse_options(fax_exec_options, &opts, NULL, args.options)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return -1;
}
if (ast_strlen_zero(args.filenames)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s requires an argument (filename[&filename[&filename]],options])\n", app_sendfax);
ao2_ref(details, -1);
return -1;
}
/* check for unsupported FAX application options */
if (ast_test_flag(&opts, OPT_CALLERMODE) || ast_test_flag(&opts, OPT_CALLEDMODE)) {
ast_string_field_set(details, error, "INVALID_ARGUMENTS");
ast_string_field_set(details, resultstr, "invalid arguments");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "%s does not support polling\n", app_sendfax);
ao2_ref(details, -1);
return -1;
}
ast_atomic_fetchadd_int(&faxregistry.fax_tx_attempts, 1);
file_count = 0;
filenames = args.filenames;
while ((c = strsep(&filenames, "&"))) {
if (access(c, (F_OK | R_OK)) < 0) {
ast_string_field_set(details, error, "FILE_ERROR");
ast_string_field_set(details, resultstr, "error reading file");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "access failure. Verify '%s' exists and check permissions.\n", args.filenames);
ao2_ref(details, -1);
return -1;
}
if (!(doc = ast_calloc(1, sizeof(*doc) + strlen(c) + 1))) {
ast_string_field_set(details, error, "MEMORY_ERROR");
ast_string_field_set(details, resultstr, "error allocating memory");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "System cannot provide memory for session requirements.\n");
ao2_ref(details, -1);
return -1;
}
strcpy(doc->filename, c);
AST_LIST_INSERT_TAIL(&details->documents, doc, next);
file_count++;
}
if (file_count > 1) {
details->caps |= AST_FAX_TECH_MULTI_DOC;
}
ast_verb(3, "Channel '%s' sending FAX:\n", chan->name);
AST_LIST_TRAVERSE(&details->documents, doc, next) {
ast_verb(3, " %s\n", doc->filename);
}
details->caps = AST_FAX_TECH_SEND;
/* check for debug */
if (ast_test_flag(&opts, OPT_DEBUG) || global_fax_debug) {
details->option.debug = AST_FAX_OPTFLAG_TRUE;
}
/* check for request for status events */
if (ast_test_flag(&opts, OPT_STATUS)) {
details->option.statusevents = AST_FAX_OPTFLAG_TRUE;
}
t38state = ast_channel_get_t38_state(chan);
if ((t38state == T38_STATE_UNAVAILABLE) || (t38state == T38_STATE_REJECTED) ||
ast_test_flag(&opts, OPT_ALLOWAUDIO) ||
ast_test_flag(&opts, OPT_FORCE_AUDIO)) {
details->option.allow_audio = AST_FAX_OPTFLAG_TRUE;
}
if (ast_test_flag(&opts, OPT_REQUEST_T38)) {
details->option.request_t38 = AST_FAX_OPTFLAG_TRUE;
}
if (!(s = fax_session_reserve(details, &token))) {
ast_string_field_set(details, resultstr, "error reserving fax session");
set_channel_variables(chan, details);
ast_log(LOG_ERROR, "Unable to reserve FAX session.\n");
ao2_ref(details, -1);
return -1;
}
/* make sure the channel is up */
if (chan->_state != AST_STATE_UP) {
if (ast_answer(chan)) {
ast_string_field_set(details, resultstr, "error answering channel");
set_channel_variables(chan, details);
ast_log(LOG_WARNING, "Channel '%s' failed answer attempt.\n", chan->name);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
return -1;
}
}
if (!ast_test_flag(&opts, OPT_FORCE_AUDIO)) {
if (set_fax_t38_caps(chan, details)) {
ast_string_field_set(details, error, "T38_NEG_ERROR");
ast_string_field_set(details, resultstr, "error negotiating T.38");
set_channel_variables(chan, details);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
return -1;
}
} else {
details->caps |= AST_FAX_TECH_AUDIO;
}
if (!ast_test_flag(&opts, OPT_FORCE_AUDIO) && (details->caps & AST_FAX_TECH_T38)) {
if (sendfax_t38_init(chan, details)) {
ast_string_field_set(details, error, "T38_NEG_ERROR");
ast_string_field_set(details, resultstr, "error negotiating T.38");
set_channel_variables(chan, details);
fax_session_release(s, token);
ao2_ref(s, -1);
ao2_ref(details, -1);
ast_log(LOG_ERROR, "error initializing channel '%s' in T.38 mode\n", chan->name);
return -1;
}
} else {
details->option.send_cng = 1;
}
if ((channel_alive = generic_fax_exec(chan, details, s, token)) < 0) {
ast_atomic_fetchadd_int(&faxregistry.fax_failures, 1);
}
if (ast_channel_get_t38_state(chan) == T38_STATE_NEGOTIATED) {
if (disable_t38(chan)) {
ast_debug(1, "error disabling T.38 mode on %s\n", chan->name);
}
}
if (!(filenames = generate_filenames_string(details, "FileName: ", "\r\n"))) {
ast_log(LOG_ERROR, "Error generating SendFAX manager event\n");
ao2_ref(s, -1);
ao2_ref(details, -1);
return (!channel_alive) ? -1 : 0;
}
/* send out the AMI completion event */
ast_channel_lock(chan);
get_manager_event_info(chan, &info);
manager_event(EVENT_FLAG_CALL,
"SendFAX",
"Channel: %s\r\n"
"Context: %s\r\n"
"Exten: %s\r\n"
"CallerID: %s\r\n"
"RemoteStationID: %s\r\n"
"LocalStationID: %s\r\n"
"PagesTransferred: %s\r\n"
"Resolution: %s\r\n"
"TransferRate: %s\r\n"
"%s\r\n",
chan->name,
info.context,
info.exten,
info.cid,
S_OR(pbx_builtin_getvar_helper(chan, "REMOTESTATIONID"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "LOCALSTATIONID"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXPAGES"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXRESOLUTION"), ""),
S_OR(pbx_builtin_getvar_helper(chan, "FAXBITRATE"), ""),
filenames);
ast_channel_unlock(chan);
ast_free(filenames);
ao2_ref(s, -1);
ao2_ref(details, -1);
/* If the channel hungup return -1; otherwise, return 0 to continue in the dialplan */
return (!channel_alive) ? -1 : 0;
}
/*! \brief destroy a FAX gateway session structure */
static void destroy_gateway(void *data)
{
struct fax_gateway *gateway = data;
if (gateway->chan_dsp) {
ast_dsp_free(gateway->chan_dsp);
gateway->chan_dsp = NULL;
}
if (gateway->peer_dsp) {
ast_dsp_free(gateway->peer_dsp);
gateway->peer_dsp = NULL;
}
if (gateway->s) {
fax_session_release(gateway->s, gateway->token);
gateway->token = NULL;
gateway->s->details->caps |= ~AST_FAX_TECH_GATEWAY;
ao2_lock(faxregistry.container);
ao2_unlink(faxregistry.container, gateway->s);
ao2_unlock(faxregistry.container);
ao2_ref(gateway->s, -1);
gateway->s = NULL;
}
}
/*! \brief Create a new fax gateway object.
* \param details the fax session details
* \return NULL or a fax gateway object
*/
static struct fax_gateway *fax_gateway_new(struct ast_fax_session_details *details)
{
struct fax_gateway *gateway = ao2_alloc(sizeof(*gateway), destroy_gateway);
if (!gateway) {
return NULL;
}
gateway->chan_dsp = ast_dsp_new();
if (!gateway->chan_dsp) {
ao2_ref(gateway, -1);
return NULL;
}
gateway->peer_dsp = ast_dsp_new();
if (!gateway->peer_dsp) {
ao2_ref(gateway, -1);
return NULL;
}
gateway->framehook = -1;
ast_dsp_set_features(gateway->chan_dsp, DSP_FEATURE_FAX_DETECT);
ast_dsp_set_faxmode(gateway->chan_dsp, DSP_FAXMODE_DETECT_CED);
ast_dsp_set_features(gateway->peer_dsp, DSP_FEATURE_FAX_DETECT);
ast_dsp_set_faxmode(gateway->peer_dsp, DSP_FAXMODE_DETECT_CED);
details->caps = AST_FAX_TECH_GATEWAY;
if (!(gateway->s = fax_session_reserve(details, &gateway->token))) {
details->caps |= ~AST_FAX_TECH_GATEWAY;
ast_log(LOG_ERROR, "Can't reserve a FAX session, gateway attempt failed.\n");
ao2_ref(gateway, -1);
return NULL;
}
return gateway;
}
/*! \brief Create a fax session and start T.30<->T.38 gateway mode
* \param gateway a fax gateway object
* \param details fax session details
* \param chan active channel
* \return 0 on error 1 on success*/
static int fax_gateway_start(struct fax_gateway *gateway, struct ast_fax_session_details *details, struct ast_channel *chan)
{
struct ast_fax_session *s;
/* create the FAX session */
if (!(s = fax_session_new(details, chan, gateway->s, gateway->token))) {
gateway->token = NULL;
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error starting gateway session");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
report_fax_status(chan, details, "No Available Resource");
ast_log(LOG_ERROR, "Can't create a FAX session, gateway attempt failed.\n");
return -1;
}
/* release the reference for the reserved session and replace it with
* the real session */
ao2_ref(gateway->s, -1);
gateway->s = s;
gateway->token = NULL;
if (gateway->s->tech->start_session(gateway->s) < 0) {
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error starting gateway session");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
return -1;
}
gateway->timeout_start.tv_sec = 0;
gateway->timeout_start.tv_usec = 0;
report_fax_status(chan, details, "FAX Transmission In Progress");
return 0;
}
static struct ast_frame *fax_gateway_send_ced(struct fax_gateway *gateway, struct ast_channel *chan, struct ast_frame *f)
{
struct ast_frame *fp;
struct ast_control_t38_parameters t38_parameters = {
.request_response = AST_T38_REQUEST_NEGOTIATE,
};
struct ast_frame control_frame = {
.src = "res_fax",
.frametype = AST_FRAME_CONTROL,
.datalen = sizeof(t38_parameters),
.subclass.integer = AST_CONTROL_T38_PARAMETERS,
.data.ptr = &t38_parameters,
};
struct ast_fax_session_details *details = find_details(chan);
if (!details) {
ast_log(LOG_ERROR, "no FAX session details found on chan %s for T.38 gateway session, odd\n", chan->name);
ast_framehook_detach(chan, gateway->framehook);
return f;
}
t38_parameters_fax_to_ast(&t38_parameters, &details->our_t38_parameters);
ao2_ref(details, -1);
if (!(fp = ast_frisolate(&control_frame))) {
ast_log(LOG_ERROR, "error generating T.38 request control frame on chan %s for T.38 gateway session\n", chan->name);
return f;
}
gateway->t38_state = T38_STATE_NEGOTIATING;
gateway->timeout_start = ast_tvnow();
gateway->ced_timeout_start.tv_sec = 0;
gateway->ced_timeout_start.tv_usec = 0;
ast_debug(1, "detected CED tone; requesting T.38 for gateway session for %s\n", chan->name);
return fp;
}
static struct ast_frame *fax_gateway_detect_ced(struct fax_gateway *gateway, struct ast_channel *chan, struct ast_channel *peer, struct ast_channel *active, struct ast_frame *f)
{
struct ast_frame *dfr = ast_frdup(f);
struct ast_dsp *active_dsp = (active == chan) ? gateway->chan_dsp : gateway->peer_dsp;
struct ast_channel *other = (active == chan) ? peer : chan;
/* if we have already detected a CED tone, don't waste time here */
if (!ast_tvzero(gateway->ced_timeout_start)) {
return f;
}
if (!dfr) {
return f;
}
if (!(dfr = ast_dsp_process(active, active_dsp, dfr))) {
return f;
}
if (dfr->frametype == AST_FRAME_DTMF && dfr->subclass.integer == 'e') {
if (ast_channel_get_t38_state(other) == T38_STATE_UNKNOWN) {
if (ast_channel_get_t38_state(active) == T38_STATE_UNKNOWN) {
gateway->ced_timeout_start = ast_tvnow();
gateway->ced_chan = (active == chan);
ast_debug(1, "detected CED tone from %s; will schedule T.38 request on %s\n", active->name, other->name);
} else {
return fax_gateway_send_ced(gateway, chan, f);
}
} else {
ast_debug(1, "detected CED tone on %s, but %s does not support T.38 for T.38 gateway session\n", active->name, other->name);
}
}
ast_frfree(dfr);
return f;
}
static int fax_gateway_indicate_t38(struct ast_channel *chan, struct ast_channel *active, struct ast_control_t38_parameters *control_params)
{
if (active == chan) {
return ast_indicate_data(chan, AST_CONTROL_T38_PARAMETERS, control_params, sizeof(*control_params));
} else {
return ast_queue_control_data(chan, AST_CONTROL_T38_PARAMETERS, control_params, sizeof(*control_params));
}
}
/*! \brief T38 Gateway Negotiate t38 parameters
* \param gateway gateway object
* \param chan channel running the gateway
* \param peer channel im bridged too
* \param active channel the frame originated on
* \param f the control frame to process
* \return processed control frame or null frame
*/
static struct ast_frame *fax_gateway_detect_t38(struct fax_gateway *gateway, struct ast_channel *chan, struct ast_channel *peer, struct ast_channel *active, struct ast_frame *f)
{
struct ast_control_t38_parameters *control_params = f->data.ptr;
struct ast_channel *other = (active == chan) ? peer : chan;
struct ast_fax_session_details *details;
if (f->datalen != sizeof(struct ast_control_t38_parameters)) {
/* invalaid AST_CONTROL_T38_PARAMETERS frame, we can't
* do anything with it, pass it on */
return f;
}
/* ignore frames from ourselves */
if ((gateway->t38_state == T38_STATE_NEGOTIATED && control_params->request_response == AST_T38_NEGOTIATED)
|| (gateway->t38_state == T38_STATE_REJECTED && control_params->request_response == AST_T38_REFUSED)
|| (gateway->t38_state == T38_STATE_NEGOTIATING && control_params->request_response == AST_T38_REQUEST_TERMINATE)) {
return f;
}
if (!(details = find_details(chan))) {
ast_log(LOG_ERROR, "no FAX session details found on chan %s for T.38 gateway session, odd\n", chan->name);
ast_framehook_detach(chan, gateway->framehook);
return f;
}
if (control_params->request_response == AST_T38_REQUEST_NEGOTIATE) {
enum ast_t38_state state = ast_channel_get_t38_state(other);
gateway->ced_timeout_start.tv_sec = 0;
gateway->ced_timeout_start.tv_usec = 0;
if (state == T38_STATE_UNKNOWN) {
/* we detected a request to negotiate T.38 and the
* other channel appears to support T.38, we'll pass
* the request through and only step in if the other
* channel rejects the request */
ast_debug(1, "%s is attempting to negotiate T.38 with %s, we'll see what happens\n", active->name, other->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, control_params);
gateway->t38_state = T38_STATE_UNKNOWN;
gateway->timeout_start = ast_tvnow();
ao2_ref(details, -1);
return f;
} else if (state == T38_STATE_UNAVAILABLE || state == T38_STATE_REJECTED) {
/* the other channel does not support T.38, we need to
* step in here */
ast_debug(1, "%s is attempting to negotiate T.38 but %s does not support it\n", active->name, other->name);
ast_debug(1, "starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", active->name, other->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, control_params);
t38_parameters_fax_to_ast(control_params, &details->our_t38_parameters);
if (fax_gateway_start(gateway, details, chan)) {
ast_log(LOG_ERROR, "error starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", active->name, other->name);
gateway->t38_state = T38_STATE_REJECTED;
control_params->request_response = AST_T38_REFUSED;
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
} else {
gateway->t38_state = T38_STATE_NEGOTIATED;
control_params->request_response = AST_T38_NEGOTIATED;
report_fax_status(chan, details, "T.38 Negotiated");
}
fax_gateway_indicate_t38(chan, active, control_params);
ao2_ref(details, -1);
return &ast_null_frame;
} else if (gateway->t38_state == T38_STATE_NEGOTIATING) {
/* we got a request to negotiate T.38 after we already
* sent one to the other party based on CED tone
* detection. We'll just pretend we passed this request
* through in the first place. */
t38_parameters_ast_to_fax(&details->their_t38_parameters, control_params);
gateway->t38_state = T38_STATE_UNKNOWN;
gateway->timeout_start = ast_tvnow();
ast_debug(1, "%s is attempting to negotiate T.38 after we already sent a negotiation request based on CED detection\n", active->name);
ao2_ref(details, -1);
return &ast_null_frame;
} else if (gateway->t38_state == T38_STATE_NEGOTIATED) {
/* we got a request to negotiate T.38 after we already
* sent one to the other party based on CED tone
* detection and received a response. We need to
* respond to this and shut down the gateway. */
t38_parameters_fax_to_ast(control_params, &details->their_t38_parameters);
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
control_params->request_response = AST_T38_NEGOTIATED;
fax_gateway_indicate_t38(chan, active, control_params);
ast_string_field_set(details, result, "SUCCESS");
ast_string_field_set(details, resultstr, "no gateway necessary");
ast_string_field_set(details, error, "NATIVE_T38");
set_channel_variables(chan, details);
ast_debug(1, "%s is attempting to negotiate T.38 after we already negotiated T.38 with %s, disabling the gateway\n", active->name, other->name);
ao2_ref(details, -1);
return &ast_null_frame;
} else {
ast_log(LOG_WARNING, "%s is attempting to negotiate T.38 while %s is in an unsupported state\n", active->name, other->name);
ao2_ref(details, -1);
return f;
}
} else if (gateway->t38_state == T38_STATE_NEGOTIATING
&& control_params->request_response == AST_T38_REFUSED) {
ast_debug(1, "unable to negotiate T.38 on %s for fax gateway\n", active->name);
/* our request to negotiate T.38 was refused, if the other
* channel supports T.38, they might still reinvite and save
* the day. Otherwise disable the gateway. */
if (ast_channel_get_t38_state(other) == T38_STATE_UNKNOWN) {
gateway->t38_state = T38_STATE_UNAVAILABLE;
} else {
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "unable to negotiate T.38");
ast_string_field_set(details, error, "T38_NEG_ERROR");
set_channel_variables(chan, details);
}
ao2_ref(details, -1);
return &ast_null_frame;
} else if (gateway->t38_state == T38_STATE_NEGOTIATING
&& control_params->request_response == AST_T38_NEGOTIATED) {
ast_debug(1, "starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", active->name, other->name);
t38_parameters_ast_to_fax(&details->their_t38_parameters, control_params);
if (fax_gateway_start(gateway, details, chan)) {
ast_log(LOG_ERROR, "error starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", active->name, other->name);
gateway->t38_state = T38_STATE_NEGOTIATING;
control_params->request_response = AST_T38_REQUEST_TERMINATE;
fax_gateway_indicate_t38(chan, active, control_params);
} else {
gateway->t38_state = T38_STATE_NEGOTIATED;
report_fax_status(chan, details, "T.38 Negotiated");
}
ao2_ref(details, -1);
return &ast_null_frame;
} else if (control_params->request_response == AST_T38_REFUSED) {
/* the other channel refused the request to negotiate T.38,
* we'll step in here and pretend the request was accepted */
ast_debug(1, "%s attempted to negotiate T.38 but %s refused the request\n", other->name, active->name);
ast_debug(1, "starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", other->name, active->name);
t38_parameters_fax_to_ast(control_params, &details->our_t38_parameters);
if (fax_gateway_start(gateway, details, chan)) {
ast_log(LOG_ERROR, "error starting T.38 gateway for T.38 channel %s and G.711 channel %s\n", active->name, other->name);
gateway->t38_state = T38_STATE_REJECTED;
control_params->request_response = AST_T38_REFUSED;
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
} else {
gateway->t38_state = T38_STATE_NEGOTIATED;
control_params->request_response = AST_T38_NEGOTIATED;
}
ao2_ref(details, -1);
return f;
} else if (control_params->request_response == AST_T38_REQUEST_TERMINATE) {
/* the channel wishes to end our short relationship, we shall
* oblige */
ast_debug(1, "T.38 channel %s is requesting a shutdown of T.38, disabling the gateway\n", active->name);
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
gateway->t38_state = T38_STATE_REJECTED;
control_params->request_response = AST_T38_TERMINATED;
fax_gateway_indicate_t38(chan, active, control_params);
ao2_ref(details, -1);
return &ast_null_frame;
} else if (control_params->request_response == AST_T38_NEGOTIATED) {
ast_debug(1, "T.38 successfully negotiated between %s and %s, no gateway necessary\n", active->name, other->name);
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
ast_string_field_set(details, result, "SUCCESS");
ast_string_field_set(details, resultstr, "no gateway necessary");
ast_string_field_set(details, error, "NATIVE_T38");
set_channel_variables(chan, details);
ao2_ref(details, -1);
return f;
} else if (control_params->request_response == AST_T38_TERMINATED) {
ast_debug(1, "T.38 disabled on channel %s\n", active->name);
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
ao2_ref(details, -1);
return &ast_null_frame;
}
ao2_ref(details, -1);
return f;
}
/*! \brief Destroy the gateway data structure when the framehook is detached
* \param data framehook data (gateway data)*/
static void fax_gateway_framehook_destroy(void *data) {
struct fax_gateway *gateway = data;
if (gateway->s) {
switch (gateway->s->state) {
case AST_FAX_STATE_INITIALIZED:
case AST_FAX_STATE_OPEN:
case AST_FAX_STATE_ACTIVE:
case AST_FAX_STATE_COMPLETE:
if (gateway->s->tech->cancel_session) {
gateway->s->tech->cancel_session(gateway->s);
}
/* fall through */
default:
break;
}
}
ao2_ref(gateway, -1);
}
/*! \brief T.30<->T.38 gateway framehook.
*
* Intercept packets on bridged channels and determine if a T.38 gateway is
* required. If a gateway is required, start a gateway and handle T.38
* negotiation if necessary.
*
* \param chan channel running the gateway
* \param f frame to handle may be NULL
* \param event framehook event
* \param data framehook data (struct fax_gateway *)
*
* \return processed frame or NULL when f is NULL or a null frame
*/
static struct ast_frame *fax_gateway_framehook(struct ast_channel *chan, struct ast_frame *f, enum ast_framehook_event event, void *data) {
struct fax_gateway *gateway = data;
struct ast_channel *peer, *active;
/* restore audio formats when we are detached */
if (event == AST_FRAMEHOOK_EVENT_DETACHED) {
set_channel_variables(chan, gateway->s->details);
if (gateway->bridged) {
ast_set_read_format(chan, &gateway->chan_read_format);
ast_set_read_format(chan, &gateway->chan_write_format);
if ((peer = ast_bridged_channel(chan))) {
ast_set_read_format(peer, &gateway->peer_read_format);
ast_set_read_format(peer, &gateway->peer_write_format);
ast_channel_make_compatible(chan, peer);
}
}
return NULL;
}
if (!f || (event == AST_FRAMEHOOK_EVENT_ATTACHED)) {
return NULL;
};
/* this frame was generated by the fax gateway, pass it on */
if (ast_test_flag(f, AST_FAX_FRFLAG_GATEWAY)) {
return f;
}
if (!(peer = ast_bridged_channel(chan))) {
/* not bridged, don't do anything */
return f;
}
if (!gateway->bridged && peer) {
/* don't start a gateway if neither channel can handle T.38 */
if (ast_channel_get_t38_state(chan) == T38_STATE_UNAVAILABLE && ast_channel_get_t38_state(peer) == T38_STATE_UNAVAILABLE) {
ast_debug(1, "not starting gateway for %s and %s; neither channel supports T.38\n", chan->name, peer->name);
ast_framehook_detach(chan, gateway->framehook);
gateway->s->details->gateway_id = -1;
ast_string_field_set(gateway->s->details, result, "FAILED");
ast_string_field_set(gateway->s->details, resultstr, "neither channel supports T.38");
ast_string_field_set(gateway->s->details, error, "T38_NEG_ERROR");
set_channel_variables(chan, gateway->s->details);
return f;
}
gateway->timeout_start = ast_tvnow();
/* we are bridged, change r/w formats to SLIN for CED detection and T.30 */
ast_format_copy(&gateway->chan_read_format, &chan->readformat);
ast_format_copy(&gateway->chan_write_format, &chan->readformat);
ast_format_copy(&gateway->peer_read_format, &peer->readformat);
ast_format_copy(&gateway->peer_write_format, &peer->readformat);
ast_set_read_format_by_id(chan, AST_FORMAT_SLINEAR);
ast_set_write_format_by_id(chan, AST_FORMAT_SLINEAR);
ast_set_read_format_by_id(peer, AST_FORMAT_SLINEAR);
ast_set_write_format_by_id(peer, AST_FORMAT_SLINEAR);
ast_channel_make_compatible(chan, peer);
gateway->bridged = 1;
}
if (gateway->bridged && !ast_tvzero(gateway->timeout_start)) {
if (ast_tvdiff_ms(ast_tvnow(), gateway->timeout_start) > FAX_GATEWAY_TIMEOUT) {
ast_debug(1, "no fax activity between %s and %s after %d ms, disabling gateway\n", chan->name, peer->name, FAX_GATEWAY_TIMEOUT);
ast_framehook_detach(chan, gateway->framehook);
gateway->s->details->gateway_id = -1;
ast_string_field_set(gateway->s->details, result, "FAILED");
ast_string_field_build(gateway->s->details, resultstr, "no fax activity after %d ms", FAX_GATEWAY_TIMEOUT);
ast_string_field_set(gateway->s->details, error, "TIMEOUT");
set_channel_variables(chan, gateway->s->details);
return f;
}
}
/* only handle VOICE, MODEM, and CONTROL frames*/
switch (f->frametype) {
case AST_FRAME_VOICE:
switch (f->subclass.format.id) {
case AST_FORMAT_SLINEAR:
case AST_FORMAT_ALAW:
case AST_FORMAT_ULAW:
break;
default:
return f;
}
break;
case AST_FRAME_MODEM:
if (f->subclass.integer == AST_MODEM_T38) {
break;
}
return f;
case AST_FRAME_CONTROL:
if (f->subclass.integer == AST_CONTROL_T38_PARAMETERS) {
break;
}
return f;
default:
return f;
}
/* detect the active channel */
switch (event) {
case AST_FRAMEHOOK_EVENT_WRITE:
active = peer;
break;
case AST_FRAMEHOOK_EVENT_READ:
active = chan;
break;
default:
ast_log(LOG_WARNING, "unhandled framehook event %i\n", event);
return f;
}
/* handle control frames */
if (f->frametype == AST_FRAME_CONTROL && f->subclass.integer == AST_CONTROL_T38_PARAMETERS) {
return fax_gateway_detect_t38(gateway, chan, peer, active, f);
}
/* handle the ced timeout delay */
if (!ast_tvzero(gateway->ced_timeout_start)) {
if (ast_tvdiff_ms(ast_tvnow(), gateway->ced_timeout_start) > FAX_GATEWAY_CED_TIMEOUT) {
if (gateway->ced_chan && chan == active) {
return fax_gateway_send_ced(gateway, chan, f);
} else if (!gateway->ced_chan && peer == active) {
return fax_gateway_send_ced(gateway, chan, f);
}
}
} else if (gateway->t38_state == T38_STATE_UNAVAILABLE && f->frametype == AST_FRAME_VOICE) {
/* not in gateway mode and have not detected CED yet, listen
* for CED */
/* XXX this should detect a v21 preamble instead of CED */
return fax_gateway_detect_ced(gateway, chan, peer, active, f);
}
/* in gateway mode, gateway some packets */
if (gateway->t38_state == T38_STATE_NEGOTIATED) {
/* framehooks are called in __ast_read() before frame format
* translation is done, so we need to translate here */
if ((f->frametype == AST_FRAME_VOICE) && (f->subclass.format.id != AST_FORMAT_SLINEAR)) {
if (active->readtrans && (f = ast_translate(active->readtrans, f, 1)) == NULL) {
f = &ast_null_frame;
return f;
}
}
/* XXX we ignore the return value here, perhaps we should
* disable the gateway if a write fails. I am not sure how a
* write would fail, or even if a failure would be fatal so for
* now we'll just ignore the return value. */
gateway->s->tech->write(gateway->s, f);
f = &ast_null_frame;
return f;
}
/* force silence on the line if T.38 negotiation might be taking place */
if (!ast_tvzero(gateway->ced_timeout_start) || (gateway->t38_state != T38_STATE_UNAVAILABLE && gateway->t38_state != T38_STATE_REJECTED)) {
if (f->frametype == AST_FRAME_VOICE && f->subclass.format.id == AST_FORMAT_SLINEAR) {
short silence_buf[f->samples];
struct ast_frame silence_frame = {
.frametype = AST_FRAME_VOICE,
.data.ptr = silence_buf,
.samples = f->samples,
.datalen = sizeof(silence_buf),
};
ast_format_set(&silence_frame.subclass.format, AST_FORMAT_SLINEAR, 0);
memset(silence_buf, 0, sizeof(silence_buf));
return ast_frisolate(&silence_frame);
} else {
return &ast_null_frame;
}
}
return f;
}
/*! \brief Attach a gateway framehook object to a channel.
* \param chan the channel to attach to
* \param details fax session details
* \return the framehook id of the attached framehook or -1 on error
* \retval -1 error
*/
static int fax_gateway_attach(struct ast_channel *chan, struct ast_fax_session_details *details)
{
struct fax_gateway *gateway;
struct ast_framehook_interface fr_hook = {
.version = AST_FRAMEHOOK_INTERFACE_VERSION,
.event_cb = fax_gateway_framehook,
.destroy_cb = fax_gateway_framehook_destroy,
};
ast_string_field_set(details, result, "SUCCESS");
ast_string_field_set(details, resultstr, "gateway operation started successfully");
ast_string_field_set(details, error, "NO_ERROR");
set_channel_variables(chan, details);
/* set up the frame hook*/
gateway = fax_gateway_new(details);
if (!gateway) {
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error initializing gateway session");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
report_fax_status(chan, details, "No Available Resource");
return -1;
}
fr_hook.data = gateway;
ast_channel_lock(chan);
gateway->framehook = ast_framehook_attach(chan, &fr_hook);
ast_channel_unlock(chan);
if (gateway->framehook < 0) {
ao2_ref(gateway, -1);
ast_string_field_set(details, result, "FAILED");
ast_string_field_set(details, resultstr, "error attaching gateway to channel");
ast_string_field_set(details, error, "INIT_ERROR");
set_channel_variables(chan, details);
return -1;
}
return gateway->framehook;
}
/*! \brief hash callback for ao2 */
static int session_hash_cb(const void *obj, const int flags)
{
const struct ast_fax_session *s = obj;
return s->id;
}
/*! \brief compare callback for ao2 */
static int session_cmp_cb(void *obj, void *arg, int flags)
{
struct ast_fax_session *lhs = obj, *rhs = arg;
return (lhs->id == rhs->id) ? CMP_MATCH | CMP_STOP : 0;
}
/*! \brief fax session tab completion */
static char *fax_session_tab_complete(struct ast_cli_args *a)
{
int tklen;
int wordnum = 0;
char *name = NULL;
struct ao2_iterator i;
struct ast_fax_session *s;
char tbuf[5];
if (a->pos != 3) {
return NULL;
}
tklen = strlen(a->word);
i = ao2_iterator_init(faxregistry.container, 0);
while ((s = ao2_iterator_next(&i))) {
snprintf(tbuf, sizeof(tbuf), "%d", s->id);
if (!strncasecmp(a->word, tbuf, tklen) && ++wordnum > a->n) {
name = ast_strdup(tbuf);
ao2_ref(s, -1);
break;
}
ao2_ref(s, -1);
}
ao2_iterator_destroy(&i);
return name;
}
static char *cli_fax_show_version(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct fax_module *fax;
switch(cmd) {
case CLI_INIT:
e->command = "fax show version";
e->usage =
"Usage: fax show version\n"
" Show versions of FAX For Asterisk components.\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
if (a->argc != 3) {
return CLI_SHOWUSAGE;
}
ast_cli(a->fd, "FAX For Asterisk Components:\n");
ast_cli(a->fd, "\tApplications: %s\n", ast_get_version());
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, fax, list) {
ast_cli(a->fd, "\t%s: %s\n", fax->tech->description, fax->tech->version);
}
AST_RWLIST_UNLOCK(&faxmodules);
ast_cli(a->fd, "\n");
return CLI_SUCCESS;
}
/*! \brief enable FAX debugging */
static char *cli_fax_set_debug(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
int flag;
const char *what;
switch (cmd) {
case CLI_INIT:
e->command = "fax set debug {on|off}";
e->usage =
"Usage: fax set debug { on | off }\n"
" Enable/Disable FAX debugging on new FAX sessions. The basic FAX debugging will result in\n"
" additional events sent to manager sessions with 'call' class permissions. When\n"
" verbosity is greater than '5' events will be displayed to the console and audio versus\n"
" energy analysis will be performed and displayed to the console.\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
what = a->argv[e->args-1]; /* guaranteed to exist */
if (!strcasecmp(what, "on")) {
flag = 1;
} else if (!strcasecmp(what, "off")) {
flag = 0;
} else {
return CLI_SHOWUSAGE;
}
global_fax_debug = flag;
ast_cli(a->fd, "\n\nFAX Debug %s\n\n", (flag) ? "Enabled" : "Disabled");
return CLI_SUCCESS;
}
/*! \brief display registered FAX capabilities */
static char *cli_fax_show_capabilities(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct fax_module *fax;
unsigned int num_modules = 0;
switch (cmd) {
case CLI_INIT:
e->command = "fax show capabilities";
e->usage =
"Usage: fax show capabilities\n"
" Shows the capabilities of the registered FAX technology modules\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
ast_cli(a->fd, "\n\nRegistered FAX Technology Modules:\n\n");
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, fax, list) {
ast_cli(a->fd, "%-15s : %s\n%-15s : %s\n%-15s : ", "Type", fax->tech->type, "Description", fax->tech->description, "Capabilities");
fax->tech->cli_show_capabilities(a->fd);
num_modules++;
}
AST_RWLIST_UNLOCK(&faxmodules);
ast_cli(a->fd, "%d registered modules\n\n", num_modules);
return CLI_SUCCESS;
}
/*! \brief display global defaults and settings */
static char *cli_fax_show_settings(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct fax_module *fax;
char modems[128] = "";
switch (cmd) {
case CLI_INIT:
e->command = "fax show settings";
e->usage =
"Usage: fax show settings\n"
" Show the global settings and defaults of both the FAX core and technology modules\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
ast_cli(a->fd, "FAX For Asterisk Settings:\n");
ast_cli(a->fd, "\tECM: %s\n", general_options.ecm ? "Enabled" : "Disabled");
ast_cli(a->fd, "\tStatus Events: %s\n", general_options.statusevents ? "On" : "Off");
ast_cli(a->fd, "\tMinimum Bit Rate: %d\n", general_options.minrate);
ast_cli(a->fd, "\tMaximum Bit Rate: %d\n", general_options.maxrate);
ast_fax_modem_to_str(general_options.modems, modems, sizeof(modems));
ast_cli(a->fd, "\tModem Modulations Allowed: %s\n", modems);
ast_cli(a->fd, "\n\nFAX Technology Modules:\n\n");
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, fax, list) {
ast_cli(a->fd, "%s (%s) Settings:\n", fax->tech->type, fax->tech->description);
fax->tech->cli_show_settings(a->fd);
}
AST_RWLIST_UNLOCK(&faxmodules);
return CLI_SUCCESS;
}
/*! \brief display details of a specified fax session */
static char *cli_fax_show_session(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ast_fax_session *s, tmp;
switch (cmd) {
case CLI_INIT:
e->command = "fax show session";
e->usage =
"Usage: fax show session <session number>\n"
" Shows status of the named FAX session\n";
return NULL;
case CLI_GENERATE:
return fax_session_tab_complete(a);
}
if (a->argc != 4) {
return CLI_SHOWUSAGE;
}
if (sscanf(a->argv[3], "%d", &tmp.id) != 1) {
ast_log(LOG_ERROR, "invalid session id: '%s'\n", a->argv[3]);
return RESULT_SUCCESS;
}
ast_cli(a->fd, "\nFAX Session Details:\n--------------------\n\n");
s = ao2_find(faxregistry.container, &tmp, OBJ_POINTER);
if (s) {
s->tech->cli_show_session(s, a->fd);
ao2_ref(s, -1);
}
ast_cli(a->fd, "\n\n");
return CLI_SUCCESS;
}
/*! \brief display fax stats */
static char *cli_fax_show_stats(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct fax_module *fax;
switch (cmd) {
case CLI_INIT:
e->command = "fax show stats";
e->usage =
"Usage: fax show stats\n"
" Shows a statistical summary of FAX transmissions\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
ast_cli(a->fd, "\nFAX Statistics:\n---------------\n\n");
ast_cli(a->fd, "%-20.20s : %d\n", "Current Sessions", faxregistry.active_sessions);
ast_cli(a->fd, "%-20.20s : %d\n", "Reserved Sessions", faxregistry.reserved_sessions);
ast_cli(a->fd, "%-20.20s : %d\n", "Transmit Attempts", faxregistry.fax_tx_attempts);
ast_cli(a->fd, "%-20.20s : %d\n", "Receive Attempts", faxregistry.fax_rx_attempts);
ast_cli(a->fd, "%-20.20s : %d\n", "Completed FAXes", faxregistry.fax_complete);
ast_cli(a->fd, "%-20.20s : %d\n", "Failed FAXes", faxregistry.fax_failures);
AST_RWLIST_RDLOCK(&faxmodules);
AST_RWLIST_TRAVERSE(&faxmodules, fax, list) {
fax->tech->cli_show_stats(a->fd);
}
AST_RWLIST_UNLOCK(&faxmodules);
ast_cli(a->fd, "\n\n");
return CLI_SUCCESS;
}
/*! \brief display fax sessions */
static char *cli_fax_show_sessions(struct ast_cli_entry *e, int cmd, struct ast_cli_args *a)
{
struct ast_fax_session *s;
struct ao2_iterator i;
int session_count;
char *filenames;
switch (cmd) {
case CLI_INIT:
e->command = "fax show sessions";
e->usage =
"Usage: fax show sessions\n"
" Shows the current FAX sessions\n";
return NULL;
case CLI_GENERATE:
return NULL;
}
ast_cli(a->fd, "\nCurrent FAX Sessions:\n\n");
ast_cli(a->fd, "%-20.20s %-10.10s %-10.10s %-5.5s %-10.10s %-15.15s %-30.30s\n",
"Channel", "Tech", "FAXID", "Type", "Operation", "State", "File(s)");
i = ao2_iterator_init(faxregistry.container, 0);
while ((s = ao2_iterator_next(&i))) {
ao2_lock(s);
filenames = generate_filenames_string(s->details, "", ", ");
ast_cli(a->fd, "%-20.20s %-10.10s %-10d %-5.5s %-10.10s %-15.15s %-30s\n",
s->channame, s->tech->type, s->id,
(s->details->caps & AST_FAX_TECH_AUDIO) ? "G.711" : "T.38",
(s->details->caps & AST_FAX_TECH_GATEWAY)
? "gateway"
: (s->details->caps & AST_FAX_TECH_SEND) ? "send" : "receive",
ast_fax_state_to_str(s->state), S_OR(filenames, ""));
ast_free(filenames);
ao2_unlock(s);
ao2_ref(s, -1);
}
ao2_iterator_destroy(&i);
session_count = ao2_container_count(faxregistry.container);
ast_cli(a->fd, "\n%d FAX sessions\n\n", session_count);
return CLI_SUCCESS;
}
static struct ast_cli_entry fax_cli[] = {
AST_CLI_DEFINE(cli_fax_show_version, "Show versions of FAX For Asterisk components"),
AST_CLI_DEFINE(cli_fax_set_debug, "Enable/Disable FAX debugging on new FAX sessions"),
AST_CLI_DEFINE(cli_fax_show_capabilities, "Show the capabilities of the registered FAX technology modules"),
AST_CLI_DEFINE(cli_fax_show_settings, "Show the global settings and defaults of both the FAX core and technology modules"),
AST_CLI_DEFINE(cli_fax_show_session, "Show the status of the named FAX sessions"),
AST_CLI_DEFINE(cli_fax_show_sessions, "Show the current FAX sessions"),
AST_CLI_DEFINE(cli_fax_show_stats, "Summarize FAX session history"),
};
/*! \brief configure res_fax */
static int set_config(const char *config_file)
{
struct ast_config *cfg;
struct ast_variable *v;
struct ast_flags config_flags = { 0 };
char modems[128] = "";
/* set defaults */
general_options.minrate = RES_FAX_MINRATE;
general_options.maxrate = RES_FAX_MAXRATE;
general_options.statusevents = RES_FAX_STATUSEVENTS;
general_options.modems = RES_FAX_MODEM;
general_options.ecm = AST_FAX_OPTFLAG_TRUE;
/* read configuration */
if (!(cfg = ast_config_load2(config_file, "res_fax", config_flags))) {
ast_log(LOG_NOTICE, "Configuration file '%s' not found, using default options.\n", config_file);
return 0;
}
if (cfg == CONFIG_STATUS_FILEUNCHANGED) {
ast_clear_flag(&config_flags, CONFIG_FLAG_FILEUNCHANGED);
cfg = ast_config_load2(config_file, "res_fax", config_flags);
}
/* create configuration */
for (v = ast_variable_browse(cfg, "general"); v; v = v->next) {
int rate;
if (!strcasecmp(v->name, "minrate")) {
ast_debug(3, "reading minrate '%s' from configuration file\n", v->value);
if ((rate = fax_rate_str_to_int(v->value)) == 0) {
ast_config_destroy(cfg);
return -1;
}
general_options.minrate = rate;
} else if (!strcasecmp(v->name, "maxrate")) {
ast_debug(3, "reading maxrate '%s' from configuration file\n", v->value);
if ((rate = fax_rate_str_to_int(v->value)) == 0) {
ast_config_destroy(cfg);
return -1;
}
general_options.maxrate = rate;
} else if (!strcasecmp(v->name, "statusevents")) {
ast_debug(3, "reading statusevents '%s' from configuration file\n", v->value);
general_options.statusevents = ast_true(v->value);
} else if (!strcasecmp(v->name, "ecm")) {
ast_debug(3, "reading ecm '%s' from configuration file\n", v->value);
general_options.ecm = ast_true(v->value);
} else if ((!strcasecmp(v->name, "modem")) || (!strcasecmp(v->name, "modems"))) {
general_options.modems = 0;
update_modem_bits(&general_options.modems, v->value);
}
}
ast_config_destroy(cfg);
if (general_options.maxrate < general_options.minrate) {
ast_log(LOG_ERROR, "maxrate %d is less than minrate %d\n", general_options.maxrate, general_options.minrate);
return -1;
}
if (check_modem_rate(general_options.modems, general_options.minrate)) {
ast_fax_modem_to_str(general_options.modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'minrate' setting %d\n", modems, general_options.minrate);
return -1;
}
if (check_modem_rate(general_options.modems, general_options.maxrate)) {
ast_fax_modem_to_str(general_options.modems, modems, sizeof(modems));
ast_log(LOG_ERROR, "'modems' setting '%s' is incompatible with 'maxrate' setting %d\n", modems, general_options.maxrate);
return -1;
}
return 0;
}
/*! \brief FAXOPT read function returns the contents of a FAX option */
static int acf_faxopt_read(struct ast_channel *chan, const char *cmd, char *data, char *buf, size_t len)
{
struct ast_fax_session_details *details = find_details(chan);
int res = 0;
char *filenames;
if (!details) {
ast_log(LOG_ERROR, "channel '%s' can't read FAXOPT(%s) because it has never been written.\n", chan->name, data);
return -1;
}
if (!strcasecmp(data, "ecm")) {
ast_copy_string(buf, details->option.ecm ? "yes" : "no", len);
} else if (!strcasecmp(data, "t38gateway") || !strcasecmp(data, "gateway") ||
!strcasecmp(data, "t38_gateway") || !strcasecmp(data, "faxgateway")) {
ast_copy_string(buf, details->gateway_id != -1 ? "yes" : "no", len);
} else if (!strcasecmp(data, "error")) {
ast_copy_string(buf, details->error, len);
} else if (!strcasecmp(data, "filename")) {
if (AST_LIST_EMPTY(&details->documents)) {
ast_log(LOG_ERROR, "channel '%s' can't read FAXOPT(%s) because it has never been written.\n", chan->name, data);
res = -1;
} else {
ast_copy_string(buf, AST_LIST_FIRST(&details->documents)->filename, len);
}
} else if (!strcasecmp(data, "filenames")) {
if (AST_LIST_EMPTY(&details->documents)) {
ast_log(LOG_ERROR, "channel '%s' can't read FAXOPT(%s) because it has never been written.\n", chan->name, data);
res = -1;
} else if ((filenames = generate_filenames_string(details, "", ","))) {
ast_copy_string(buf, filenames, len);
ast_free(filenames);
} else {
ast_log(LOG_ERROR, "channel '%s' can't read FAXOPT(%s), there was an error generating the filenames list.\n", chan->name, data);
res = -1;
}
} else if (!strcasecmp(data, "headerinfo")) {
ast_copy_string(buf, details->headerinfo, len);
} else if (!strcasecmp(data, "localstationid")) {
ast_copy_string(buf, details->localstationid, len);
} else if (!strcasecmp(data, "maxrate")) {
snprintf(buf, len, "%d", details->maxrate);
} else if (!strcasecmp(data, "minrate")) {
snprintf(buf, len, "%d", details->minrate);
} else if (!strcasecmp(data, "pages")) {
snprintf(buf, len, "%d", details->pages_transferred);
} else if (!strcasecmp(data, "rate")) {
ast_copy_string(buf, details->transfer_rate, len);
} else if (!strcasecmp(data, "remotestationid")) {
ast_copy_string(buf, details->remotestationid, len);
} else if (!strcasecmp(data, "resolution")) {
ast_copy_string(buf, details->resolution, len);
} else if (!strcasecmp(data, "sessionid")) {
snprintf(buf, len, "%d", details->id);
} else if (!strcasecmp(data, "status")) {
ast_copy_string(buf, details->result, len);
} else if (!strcasecmp(data, "statusstr")) {
ast_copy_string(buf, details->resultstr, len);
} else if ((!strcasecmp(data, "modem")) || (!strcasecmp(data, "modems"))) {
ast_fax_modem_to_str(details->modems, buf, len);
} else {
ast_log(LOG_WARNING, "channel '%s' can't read FAXOPT(%s) because it is unhandled!\n", chan->name, data);
res = -1;
}
ao2_ref(details, -1);
return res;
}
/*! \brief FAXOPT write function modifies the contents of a FAX option */
static int acf_faxopt_write(struct ast_channel *chan, const char *cmd, char *data, const char *value)
{
int res = 0;
struct ast_fax_session_details *details;
if (!(details = find_or_create_details(chan))) {
ast_log(LOG_WARNING, "channel '%s' can't set FAXOPT(%s) to '%s' because it failed to create a datastore.\n", chan->name, data, value);
return -1;
}
ast_debug(3, "channel '%s' setting FAXOPT(%s) to '%s'\n", chan->name, data, value);
if (!strcasecmp(data, "ecm")) {
const char *val = ast_skip_blanks(value);
if (ast_true(val)) {
details->option.ecm = AST_FAX_OPTFLAG_TRUE;
} else if (ast_false(val)) {
details->option.ecm = AST_FAX_OPTFLAG_FALSE;
} else {
ast_log(LOG_WARNING, "Unsupported value '%s' passed to FAXOPT(ecm).\n", value);
}
} else if (!strcasecmp(data, "t38gateway") || !strcasecmp(data, "gateway") ||
!strcasecmp(data, "t38_gateway") || !strcasecmp(data, "faxgateway")) {
const char *val = ast_skip_blanks(value);
if (ast_true(val)) {
if (details->gateway_id < 0) {
details->gateway_id = fax_gateway_attach(chan, details);
if (details->gateway_id < 0) {
ast_log(LOG_ERROR, "Error attaching T.38 gateway to channel %s.\n", chan->name);
res = -1;
} else {
ast_debug(1, "Attached T.38 gateway to channel %s.\n", chan->name);
}
} else {
ast_log(LOG_WARNING, "Attempt to attach a T.38 gateway on channel (%s) with gateway already running.\n", chan->name);
}
} else if (ast_false(val)) {
ast_framehook_detach(chan, details->gateway_id);
details->gateway_id = -1;
} else {
ast_log(LOG_WARNING, "Unsupported value '%s' passed to FAXOPT(%s).\n", value, data);
}
} else if (!strcasecmp(data, "headerinfo")) {
ast_string_field_set(details, headerinfo, value);
} else if (!strcasecmp(data, "localstationid")) {
ast_string_field_set(details, localstationid, value);
} else if (!strcasecmp(data, "maxrate")) {
details->maxrate = fax_rate_str_to_int(value);
if (!details->maxrate) {
details->maxrate = ast_fax_maxrate();
}
} else if (!strcasecmp(data, "minrate")) {
details->minrate = fax_rate_str_to_int(value);
if (!details->minrate) {
details->minrate = ast_fax_minrate();
}
} else if ((!strcasecmp(data, "modem")) || (!strcasecmp(data, "modems"))) {
update_modem_bits(&details->modems, value);
} else {
ast_log(LOG_WARNING, "channel '%s' set FAXOPT(%s) to '%s' is unhandled!\n", chan->name, data, value);
res = -1;
}
ao2_ref(details, -1);
return res;
}
/*! \brief FAXOPT dialplan function */
struct ast_custom_function acf_faxopt = {
.name = "FAXOPT",
.read = acf_faxopt_read,
.write = acf_faxopt_write,
};
/*! \brief unload res_fax */
static int unload_module(void)
{
ast_cli_unregister_multiple(fax_cli, ARRAY_LEN(fax_cli));
if (ast_custom_function_unregister(&acf_faxopt) < 0) {
ast_log(LOG_WARNING, "failed to unregister function '%s'\n", acf_faxopt.name);
}
if (ast_unregister_application(app_sendfax) < 0) {
ast_log(LOG_WARNING, "failed to unregister '%s'\n", app_sendfax);
}
if (ast_unregister_application(app_receivefax) < 0) {
ast_log(LOG_WARNING, "failed to unregister '%s'\n", app_receivefax);
}
if (fax_logger_level != -1) {
ast_logger_unregister_level("FAX");
}
ao2_ref(faxregistry.container, -1);
return 0;
}
/*! \brief load res_fax */
static int load_module(void)
{
int res;
/* initialize the registry */
faxregistry.active_sessions = 0;
faxregistry.reserved_sessions = 0;
if (!(faxregistry.container = ao2_container_alloc(FAX_MAXBUCKETS, session_hash_cb, session_cmp_cb))) {
return AST_MODULE_LOAD_DECLINE;
}
if (set_config(config) < 0) {
ast_log(LOG_ERROR, "failed to load configuration file '%s'\n", config);
ao2_ref(faxregistry.container, -1);
return AST_MODULE_LOAD_DECLINE;
}
/* register CLI operations and applications */
if (ast_register_application_xml(app_sendfax, sendfax_exec) < 0) {
ast_log(LOG_WARNING, "failed to register '%s'.\n", app_sendfax);
ao2_ref(faxregistry.container, -1);
return AST_MODULE_LOAD_DECLINE;
}
if (ast_register_application_xml(app_receivefax, receivefax_exec) < 0) {
ast_log(LOG_WARNING, "failed to register '%s'.\n", app_receivefax);
ast_unregister_application(app_sendfax);
ao2_ref(faxregistry.container, -1);
return AST_MODULE_LOAD_DECLINE;
}
ast_cli_register_multiple(fax_cli, ARRAY_LEN(fax_cli));
res = ast_custom_function_register(&acf_faxopt);
fax_logger_level = ast_logger_register_level("FAX");
return res;
}
AST_MODULE_INFO(ASTERISK_GPL_KEY, AST_MODFLAG_GLOBAL_SYMBOLS | AST_MODFLAG_LOAD_ORDER, "Generic FAX Applications",
.load = load_module,
.unload = unload_module,
.load_pri = AST_MODPRI_APP_DEPEND,
);
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