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asterisk/channels/chan_modem_i4l.c

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/*
* Asterisk -- A telephony toolkit for Linux.
*
* ISDN4Linux TTY Driver
*
* Copyright (C) 2001, Mark Spencer
*
* Mark Spencer <markster@linux-support.net>
*
* This program is free software, distributed under the terms of
* the GNU General Public License
*/
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <errno.h>
#include <unistd.h>
#include <sys/ioctl.h>
#include "asterisk.h"
ASTERISK_FILE_VERSION("$Revision$")
#include "asterisk/lock.h"
#include "asterisk/vmodem.h"
#include "asterisk/module.h"
#include "asterisk/frame.h"
#include "asterisk/logger.h"
#include "asterisk/options.h"
#include "asterisk/dsp.h"
#include "asterisk/callerid.h"
#include "asterisk/ulaw.h"
#include "asterisk/pbx.h"
#define STATE_COMMAND 0
#define STATE_VOICE 1
static char *breakcmd = "\0x10\0x14\0x10\0x3";
static char *desc = "ISDN4Linux Emulated Modem Driver";
static int usecnt;
AST_MUTEX_DEFINE_STATIC(usecnt_lock);
static char *i4l_idents[] = {
/* Identify ISDN4Linux Driver */
"Linux ISDN",
NULL
};
static int i4l_setdev(struct ast_modem_pvt *p, int dev)
{
char cmd[80];
if ((dev != MODEM_DEV_TELCO) && (dev != MODEM_DEV_TELCO_SPK)) {
ast_log(LOG_WARNING, "ISDN4Linux only supports telco device, not %d.\n", dev);
return -1;
} else /* Convert DEV to our understanding of it */
dev = 2;
if (ast_modem_send(p, "AT+VLS?", 0)) {
ast_log(LOG_WARNING, "Unable to select current mode %d\n", dev);
return -1;
}
if (ast_modem_read_response(p, 5)) {
ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
return -1;
}
ast_modem_trim(p->response);
strncpy(cmd, p->response, sizeof(cmd)-1);
if (ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Modem did not respond properly\n");
return -1;
}
if (dev == atoi(cmd)) {
/* We're already in the right mode, don't bother changing for fear of
hanging up */
return 0;
}
snprintf(cmd, sizeof(cmd), "AT+VLS=%d", dev);
if (ast_modem_send(p, cmd, 0)) {
ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
return -1;
}
if (ast_modem_read_response(p, 5)) {
ast_log(LOG_WARNING, "Unable to select device %d\n", dev);
return -1;
}
ast_modem_trim(p->response);
if (strcasecmp(p->response, "VCON") && strcasecmp(p->response, "OK")) {
ast_log(LOG_WARNING, "Unexpected reply: %s\n", p->response);
return -1;
}
return 0;
}
static int i4l_startrec(struct ast_modem_pvt *p)
{
if (ast_modem_send(p, "AT+VRX+VTX", 0) ||
ast_modem_expect(p, "CONNECT", 5)) {
ast_log(LOG_WARNING, "Unable to start recording\n");
return -1;
}
p->ministate = STATE_VOICE;
/* let ast dsp detect dtmf */
if (p->dtmfmode & MODEM_DTMF_AST) {
if (p->dsp) {
ast_log(LOG_DEBUG, "Already have a dsp on %s?\n", p->dev);
} else {
p->dsp = ast_dsp_new();
if (p->dsp) {
ast_log(LOG_DEBUG, "Detecting DTMF inband with sw DSP on %s\n",p->dev);
ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT|DSP_FEATURE_FAX_DETECT);
ast_dsp_digitmode(p->dsp, DSP_DIGITMODE_DTMF | 0);
}
}
}
return 0;
}
static int i4l_break(struct ast_modem_pvt *p)
{
if (ast_modem_send(p, breakcmd, 2)) {
ast_log(LOG_WARNING, "Failed to break\n");
return -1;
}
if (ast_modem_send(p, "\r\n", 2)) {
ast_log(LOG_WARNING, "Failed to send enter?\n");
return -1;
}
#if 0
/* Read any outstanding junk */
while(!ast_modem_read_response(p, 1));
#endif
if (ast_modem_send(p, "AT", 0)) {
/* Modem might be stuck in some weird mode, try to get it out */
ast_modem_send(p, "+++", 3);
if (ast_modem_expect(p, "OK", 10)) {
ast_log(LOG_WARNING, "Modem is not responding\n");
return -1;
}
if (ast_modem_send(p, "AT", 0)) {
ast_log(LOG_WARNING, "Modem is not responding\n");
return -1;
}
}
if (ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Modem did not respond properly\n");
return -1;
}
return 0;
}
static int i4l_init(struct ast_modem_pvt *p)
{
char cmd[256];
if (option_debug)
ast_log(LOG_DEBUG, "i4l_init()\n");
if (i4l_break(p))
return -1;
/* Force into command mode */
p->ministate = STATE_COMMAND;
if (ast_modem_send(p, "AT+FCLASS=8", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to voice mode\n");
return -1;
}
if (strlen(p->msn)) {
snprintf(cmd, sizeof(cmd), "AT&E%s", p->msn);
if (ast_modem_send(p, cmd, 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set MSN to %s\n", p->msn);
return -1;
}
}
if (strlen(p->incomingmsn)) {
char *q;
snprintf(cmd, sizeof(cmd), "AT&L%s", p->incomingmsn);
/* translate , into ; since that is the seperator I4L uses, but can't be directly */
/* put in the config file because it will interpret the rest of the line as comment. */
q = cmd+4;
while (*q) {
if (*q == ',') *q = ';';
++q;
}
if (ast_modem_send(p, cmd, 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set Listen to %s\n", p->msn);
return -1;
}
}
if (ast_modem_send(p, "AT&D2", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to DTR disconnect mode\n");
return -1;
}
if (ast_modem_send(p, "ATS18=1", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to audio only mode\n");
return -1;
}
if (ast_modem_send(p, "ATS13.6=1", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to RUNG indication\n");
return -1;
}
if (ast_modem_send(p, "ATS14=4", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to transparent mode\n");
return -1;
}
if (ast_modem_send(p, "ATS23=9", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to transparent/ringing mode\n");
return -1;
}
if (ast_modem_send(p, "AT+VSM=6", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to muLAW mode\n");
return -1;
}
if (ast_modem_send(p, "AT+VLS=2", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to phone line interface\n");
return -1;
}
p->escape = 0;
return 0;
}
static struct ast_frame *i4l_handle_escape(struct ast_modem_pvt *p, char esc)
{
/* Handle escaped characters -- but sometimes we call it directly as
a quick way to cause known responses */
p->fr.frametype = AST_FRAME_NULL;
p->fr.subclass = 0;
p->fr.data = NULL;
p->fr.datalen = 0;
p->fr.samples = 0;
p->fr.offset = 0;
p->fr.mallocd = 0;
p->fr.delivery.tv_sec = 0;
p->fr.delivery.tv_usec = 0;
if (esc && option_debug)
ast_log(LOG_DEBUG, "Escaped character '%c'\n", esc);
switch(esc) {
case 'R': /* Pseudo ring */
p->fr.frametype = AST_FRAME_CONTROL;
p->fr.subclass = AST_CONTROL_RING;
return &p->fr;
case 'I': /* Pseudo ringing */
p->fr.frametype = AST_FRAME_CONTROL;
p->fr.subclass = AST_CONTROL_RINGING;
return &p->fr;
case 'X': /* Pseudo connect */
p->fr.frametype = AST_FRAME_CONTROL;
p->fr.subclass = AST_CONTROL_ANSWER;
if (p->owner)
ast_setstate(p->owner, AST_STATE_UP);
if (i4l_startrec(p))
return NULL;
return &p->fr;
case 'b': /* Busy signal */
p->fr.frametype = AST_FRAME_CONTROL;
p->fr.subclass = AST_CONTROL_BUSY;
return &p->fr;
case 'o': /* Overrun */
ast_log(LOG_WARNING, "Overflow on modem, flushing buffers\n");
if (ast_modem_send(p, "\0x10E", 2))
ast_log(LOG_WARNING, "Unable to flush buffers\n");
return &p->fr;
case CHAR_ETX: /* End Transmission */
return NULL;
case 'u': /* Underrun */
ast_log(LOG_WARNING, "Data underrun\n");
/* Fall Through */
case 'd': /* Dialtone */
case 'c': /* Calling Tone */
case 'e': /* European version */
case 'a': /* Answer Tone */
case 'f': /* Bell Answer Tone */
case 'T': /* Timing mark */
case 't': /* Handset off hook */
case 'h': /* Handset hungup */
/* Ignore */
if (option_debug)
ast_log(LOG_DEBUG, "Ignoring Escaped character '%c' (%d)\n", esc, esc);
return &p->fr;
case '0':
case '1':
case '2':
case '3':
case '4':
case '5':
case '6':
case '7':
case '8':
case '9':
case '*':
case '#':
ast_log(LOG_DEBUG, "Detected outband DTMF digit: '%c' (%d)\n", esc, esc);
p->fr.frametype=AST_FRAME_DTMF;
p->fr.subclass=esc;
return &p->fr;
case 0: /* Pseudo signal */
return &p->fr;
default:
ast_log(LOG_DEBUG, "Unknown Escaped character '%c' (%d)\n", esc, esc);
}
return &p->fr;
}
static struct ast_frame *i4l_read(struct ast_modem_pvt *p)
{
unsigned char result[256];
short *b;
struct ast_frame *f=NULL;
int res;
int x;
if (p->ministate == STATE_COMMAND) {
/* Read the first two bytes, first, in case it's a control message */
res = read(p->fd, result, 2);
if (res < 2) {
/* short read, means there was a hangup? */
/* (or is this also possible without hangup?) */
/* Anyway, reading from unitialized buffers is a bad idea anytime. */
if (errno == EAGAIN)
return i4l_handle_escape(p, 0);
return NULL;
}
if (result[0] == CHAR_DLE) {
return i4l_handle_escape(p, result[1]);
} else {
if ((result[0] == '\n') || (result[0] == '\r'))
return i4l_handle_escape(p, 0);
/* Read the rest of the line */
fgets(result + 2, sizeof(result) - 2, p->f);
ast_modem_trim(result);
if (!strcasecmp(result, "VCON")) {
/* If we're in immediate mode, reply now */
/* if (p->mode == MODEM_MODE_IMMEDIATE) */
return i4l_handle_escape(p, 'X');
} else
if (!strcasecmp(result, "BUSY")) {
/* Same as a busy signal */
return i4l_handle_escape(p, 'b');
} else
if (!strncasecmp(result, "CALLER NUMBER: ", 15 )) {
strncpy(p->cid_num, result + 15, sizeof(p->cid_num)-1);
return i4l_handle_escape(p, 0);
} else
if (!strcasecmp(result, "RINGING")) {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "%s is ringing...\n", p->dev);
return i4l_handle_escape(p, 'I');
} else
if (!strncasecmp(result, "RUNG", 4)) {
/* PM2002: the line was hung up before we picked it up, bye bye */
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "%s was hung up on before we answered\n", p->dev);
return NULL;
} else
if (!strncasecmp(result, "RING", 4)) {
if (result[4]=='/')
strncpy(p->dnid, result + 5, sizeof(p->dnid)-1);
return i4l_handle_escape(p, 'R');
} else
if (!strcasecmp(result, "NO CARRIER")) {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "%s hung up on\n", p->dev);
return NULL;
} else
if (!strcasecmp(result, "NO DIALTONE")) {
/* There's no dialtone, so the line isn't working */
ast_log(LOG_WARNING, "Device '%s' lacking dialtone\n", p->dev);
return NULL;
}
if (option_debug)
ast_log(LOG_DEBUG, "Modem said '%s'\n", result);
return i4l_handle_escape(p, 0);
}
} else {
/* We have to be more efficient in voice mode */
b = (short *)(p->obuf + p->obuflen);
while (p->obuflen/2 < 240) {
/* Read ahead the full amount */
res = read(p->fd, result, 240 - p->obuflen/2);
if (res < 1) {
/* If there's nothing there, just continue on */
if (errno == EAGAIN)
return i4l_handle_escape(p, 0);
ast_log(LOG_WARNING, "Read failed: %s\n", strerror(errno));
return NULL;
}
for (x=0;x<res;x++) {
/* Process all the bytes that we've read */
switch(result[x]) {
case CHAR_DLE:
#if 0
ast_log(LOG_DEBUG, "Ooh, an escape at %d...\n", x);
#endif
if (!p->escape) {
/* Note that next value is
an escape, and continue. */
p->escape++;
break;
} else {
/* Send as is -- fallthrough */
p->escape = 0;
}
default:
if (p->escape) {
ast_log(LOG_DEBUG, "Value of escape is %c (%d)...\n", result[x] < 32 ? '^' : result[x], result[x]);
p->escape = 0;
if (f)
ast_log(LOG_WARNING, "Warning: Dropped a signal frame\n");
f = i4l_handle_escape(p, result[x]);
/* If i4l_handle_escape says NULL, say it now, doesn't matter
what else is there, the connection is dead. */
if (!f)
return NULL;
} else {
*(b++) = AST_MULAW(result[x]);
p->obuflen += 2;
}
}
}
if (f)
break;
}
if (f) {
if( ! (!(p->dtmfmode & MODEM_DTMF_I4L) && f->frametype == AST_FRAME_DTMF))
return f;
}
/* If we get here, we have a complete voice frame */
p->fr.frametype = AST_FRAME_VOICE;
p->fr.subclass = AST_FORMAT_SLINEAR;
p->fr.samples = 240;
p->fr.data = p->obuf;
p->fr.datalen = p->obuflen;
p->fr.mallocd = 0;
p->fr.delivery.tv_sec = 0;
p->fr.delivery.tv_usec = 0;
p->fr.offset = AST_FRIENDLY_OFFSET;
p->fr.src = __FUNCTION__;
p->obuflen = 0;
/* process with dsp */
if (p->dsp) {
f = ast_dsp_process(p->owner, p->dsp, &p->fr);
if (f && (f->frametype == AST_FRAME_DTMF)) {
ast_log(LOG_DEBUG, "Detected inband DTMF digit: %c on %s\n", f->subclass, p->dev);
if (f->subclass == 'f') {
/* Fax tone -- Handle and return NULL */
struct ast_channel *ast = p->owner;
if (!p->faxhandled) {
p->faxhandled++;
if (strcmp(ast->exten, "fax")) {
const char *target_context = ast_strlen_zero(ast->macrocontext) ? ast->context : ast->macrocontext;
if (ast_exists_extension(ast, target_context, "fax", 1, ast->cid.cid_num)) {
if (option_verbose > 2)
ast_verbose(VERBOSE_PREFIX_3 "Redirecting %s to fax extension\n", ast->name);
/* Save the DID/DNIS when we transfer the fax call to a "fax" extension */
pbx_builtin_setvar_helper(ast, "FAXEXTEN", ast->exten);
if (ast_async_goto(ast, target_context, "fax", 1))
ast_log(LOG_WARNING, "Failed to async goto '%s' into fax of '%s'\n", ast->name, target_context);
} else
ast_log(LOG_NOTICE, "Fax detected, but no fax extension\n");
} else
ast_log(LOG_DEBUG, "Already in a fax extension, not redirecting\n");
} else
ast_log(LOG_DEBUG, "Fax already handled\n");
p->fr.frametype = AST_FRAME_NULL;
p->fr.subclass = 0;
f = &p->fr;
}
return f;
}
}
return &p->fr;
}
return NULL;
}
static int i4l_write(struct ast_modem_pvt *p, struct ast_frame *f)
{
#define MAX_WRITE_SIZE 2048
unsigned char result[MAX_WRITE_SIZE << 1];
unsigned char b;
int bpos=0, x;
int res;
if (f->datalen > MAX_WRITE_SIZE) {
ast_log(LOG_WARNING, "Discarding too big frame of size %d\n", f->datalen);
return -1;
}
if (f->frametype != AST_FRAME_VOICE) {
ast_log(LOG_WARNING, "Don't know how to handle %d type frames\n", f->frametype);
return -1;
}
if (f->subclass != AST_FORMAT_SLINEAR) {
ast_log(LOG_WARNING, "Don't know how to handle anything but signed linear frames\n");
return -1;
}
for (x=0;x<f->datalen/2;x++) {
b = AST_LIN2MU(((short *)f->data)[x]);
result[bpos++] = b;
if (b == CHAR_DLE)
result[bpos++]=b;
}
#if 0
res = fwrite(result, bpos, 1, p->f);
res *= bpos;
#else
res = write(p->fd, result, bpos);
#endif
if (res < 1) {
if (errno != EAGAIN) {
ast_log(LOG_WARNING, "Failed to write buffer\n");
return -1;
}
}
#if 0
printf("Result of write is %d\n", res);
#endif
return 0;
}
static char *i4l_identify(struct ast_modem_pvt *p)
{
return strdup("Linux ISDN");
}
static void i4l_incusecnt(void)
{
ast_mutex_lock(&usecnt_lock);
usecnt++;
ast_mutex_unlock(&usecnt_lock);
ast_update_use_count();
}
static void i4l_decusecnt(void)
{
ast_mutex_lock(&usecnt_lock);
usecnt++;
ast_mutex_unlock(&usecnt_lock);
ast_update_use_count();
}
static int i4l_answer(struct ast_modem_pvt *p)
{
if (ast_modem_send(p, "ATA\r", 4) ||
ast_modem_expect(p, "VCON", 10)) {
ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
return -1;
}
#if 1
if (ast_modem_send(p, "AT+VDD=0,8", 0) ||
ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Unable to set to phone line interface\n");
return -1;
}
#endif
if (ast_modem_send(p, "AT+VTX+VRX", 0) ||
ast_modem_expect(p, "CONNECT", 10)) {
ast_log(LOG_WARNING, "Unable to answer: %s", p->response);
return -1;
}
p->ministate = STATE_VOICE;
/* let ast dsp detect dtmf */
if (p->dtmfmode & MODEM_DTMF_AST) {
if (p->dsp) {
ast_log(LOG_DEBUG, "Already have a dsp on %s?\n", p->dev);
} else {
p->dsp = ast_dsp_new();
if (p->dsp) {
ast_log(LOG_DEBUG, "Detecting DTMF inband with sw DSP on %s\n",p->dev);
ast_dsp_set_features(p->dsp, DSP_FEATURE_DTMF_DETECT|DSP_FEATURE_FAX_DETECT);
ast_dsp_digitmode(p->dsp, DSP_DIGITMODE_DTMF | 0);
}
}
}
return 0;
}
static int i4l_dialdigit(struct ast_modem_pvt *p, char digit)
{
char c[2];
if (p->ministate == STATE_VOICE) {
if (p->dtmfmodegen & MODEM_DTMF_I4L) {
c[0] = CHAR_DLE;
c[1] = digit;
write(p->fd, c, 2);
ast_log(LOG_DEBUG, "Send ISDN out-of-band DTMF %c\n",digit);
}
if(p->dtmfmodegen & MODEM_DTMF_AST) {
ast_log(LOG_DEBUG, "Generating inband DTMF\n");
return -1;
}
} else
ast_log(LOG_DEBUG, "Asked to send digit but call not up on %s\n", p->dev);
return 0;
}
static int i4l_dial(struct ast_modem_pvt *p, char *stuff)
{
char cmd[80];
char tmpmsn[255];
struct ast_channel *c = p->owner;
/* Find callerid number first, to set the correct A number */
if (c && c->cid.cid_num && !(c->cid.cid_pres & 0x20)) {
snprintf(tmpmsn, sizeof(tmpmsn), ",%s,", c->cid.cid_num);
if(strlen(p->outgoingmsn) && strstr(p->outgoingmsn,tmpmsn) != NULL) {
/* Tell ISDN4Linux to use this as A number */
snprintf(cmd, sizeof(cmd), "AT&E%s\n", c->cid.cid_num);
if (ast_modem_send(p, cmd, strlen(cmd))) {
ast_log(LOG_WARNING, "Unable to set A number to %s\n", c->cid.cid_num);
}
} else {
ast_log(LOG_WARNING, "Outgoing MSN %s not allowed (see outgoingmsn=%s in modem.conf)\n",c->cid.cid_num,p->outgoingmsn);
}
}
snprintf(cmd, sizeof(cmd), "ATD%c %s\n", p->dialtype,stuff);
if (ast_modem_send(p, cmd, strlen(cmd))) {
ast_log(LOG_WARNING, "Unable to dial\n");
return -1;
}
return 0;
}
static int i4l_hangup(struct ast_modem_pvt *p)
{
char dummy[50];
int dtr = TIOCM_DTR;
/* free the memory used by the DSP */
if (p->dsp) {
ast_dsp_free(p->dsp);
p->dsp = NULL;
}
/* down DTR to hangup modem */
ioctl(p->fd, TIOCMBIC, &dtr);
/* Read anything outstanding */
while(read(p->fd, dummy, sizeof(dummy)) > 0);
/* rise DTR to re-enable line */
ioctl(p->fd, TIOCMBIS, &dtr);
/* Read anything outstanding */
while(read(p->fd, dummy, sizeof(dummy)) > 0);
/* basically we're done, just to be sure */
write(p->fd, "\n\n", 2);
read(p->fd, dummy, sizeof(dummy));
if (ast_modem_send(p, "ATH", 0)) {
ast_log(LOG_WARNING, "Unable to hang up\n");
return -1;
}
if (ast_modem_expect(p, "OK", 5)) {
ast_log(LOG_WARNING, "Final 'OK' not received\n");
return -1;
}
return 0;
}
static struct ast_modem_driver i4l_driver =
{
"i4l",
i4l_idents,
AST_FORMAT_SLINEAR,
0, /* Not full duplex */
i4l_incusecnt, /* incusecnt */
i4l_decusecnt, /* decusecnt */
i4l_identify, /* identify */
i4l_init, /* init */
i4l_setdev, /* setdev */
i4l_read,
i4l_write,
i4l_dial, /* dial */
i4l_answer, /* answer */
i4l_hangup, /* hangup */
i4l_startrec, /* start record */
NULL, /* stop record */
NULL, /* start playback */
NULL, /* stop playback */
NULL, /* set silence supression */
i4l_dialdigit, /* dialdigit */
};
int usecount(void)
{
int res;
ast_mutex_lock(&usecnt_lock);
res = usecnt;
ast_mutex_unlock(&usecnt_lock);
return res;
}
int load_module(void)
{
return ast_register_modem_driver(&i4l_driver);
}
int unload_module(void)
{
return ast_unregister_modem_driver(&i4l_driver);
}
char *description()
{
return desc;
}
char *key()
{
return ASTERISK_GPL_KEY;
}
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