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#ident "$Id: ring.c,v 4.20 2005/03/23 09:56:57 gert Exp $ Copyright (c) Gert Doering"
/* ring.c
*
* This module handles incoming RINGs, distinctive RINGs (RING 1, RING 2,
* etc.), and out-of-band messages (<DLE>v, "CONNECT", ...).
*
* Also, on ISDN "modems", multiple subscriber numbers (MSN) are mapped
* to distinctive RING types. At least, if the ISDN device returns this
* data. It's known to work for ZyXEL and ELSA products.
*
* Works closely with "cnd.c" to grab CallerID for analog modems.
*/
#include <stdio.h>
#include "syslibs.h"
#include <unistd.h>
#include <signal.h>
#include <string.h>
#include <ctype.h>
#ifndef EINTR
#include <errno.h>
#endif
#include "mgetty.h"
#include "policy.h"
#include "tio.h"
#include "fax_lib.h"
/* strdup variant that returns "<null>" in case of out-of-memory */
static char * safedup( char * in )
{
char * p = strdup( in );
return ( p == NULL ) ? "<null>" : p;
}
/* find number given in msn_list, return index */
static int find_msn _P2((string, msn_list),
char * string, char ** msn_list )
{
int i, len, len2;
char * p;
lprintf( L_NOISE, "MSN: '%s'", string );
CalledNr = safedup(string); /* save away */
if ( msn_list == NULL ) return 0; /* nothing to match against */
len=strlen(string);
/* hack off sub-addresses ("<msn>/<subaddr>")
* (future versions could do comparisons with and without subaddr...) */
p = strchr( string, '/' );
if ( p != NULL ) { len = (p - string); }
for( i=0; msn_list[i] != NULL; i++ )
{
lprintf( L_JUNK, "match: '%s'", msn_list[i] );
len2=strlen( msn_list[i] );
if ( len2 <= len &&
strncmp( msn_list[i], &string[len-len2], len2 ) == 0 )
{ return i+1; }
}
return 0; /* not found -> unspecified */
}
/* ELSA CallerID data comes in as "RING;<from>[;<to>]"
*
* this function is also used for others that report the number in
* the format [non-digit(s)]<from>[non-digit(s)]<to>
*/
static int ring_handle_ELSA _P2((string, msn_list),
char * string, char ** msn_list )
{
char * p;
char ch;
lprintf( L_MESG, "ELSA: '%s'", string );
/* remember first character, for differenciation between
* ELSA-style ("RING;from") and ISDN4Linux ("RING/to") [grrr]
*/
ch = *string;
/* skip over leading "garbage" */
while( *string != '\0' && !isdigit(*string) ) string++;
/* grab caller number (all up to the first non-digit) */
p=string;
while( isdigit(*p) ) p++;
if ( *p == '\0' ) /* only one number listed */
{
if ( ch == '/' ) /* isdn4linux -> number is MSN */
return find_msn( string, msn_list );
/* not -> it's caller ID, and no MSN */
CallerId = safedup( string );
return 0;
}
else /* MSN listed -> terminate string, get MSN */
{
*p = '\0';
CallerId = safedup( string );
p++;
while( *p != '\0' && !isdigit(*p) ) p++;
return find_msn( p, msn_list );
}
}
/* Zoom MX/S CallerID data comes in as "RING: <type> DN<id> <from> <?>"
* contributed by Thomas Schuett <info@thomas-schuett.de> */
static int ring_handle_ZoomMX _P1((string), char * string)
{
char * p;
lprintf( L_MESG, "Zoom MX/S: '%s'", string );
p=&string[8];
while( isdigit(*p) ) p++;
*p = '\0';
CallerId = safedup( &string[8] );
return ( string[6]-'0');
}
/* ZyXEL CallerID data comes in as "FM:<from> [TO:<to>]" or "TO:<to>"
*
* unless Subadressing is used, in which case this looks like
* [FM:[CallingPN] [/Subaddress/]][TO:[CalledPN] [/Subaddress/]]
* for now, subaddresses are completely ignored (here and in find_msn)
*/
static int ring_handle_ZyXEL _P2((string, msn_list),
char * string, char ** msn_list )
{
char * p, ch;
lprintf( L_MESG, "ZyXEL: '%s'", string );
if ( strncmp( string, "FM:", 3 ) == 0 ) /* caller ID */
{
string+=3;
p=string;
while( isdigit(*p) ) p++;
ch = *p; *p = '\0';
CallerId = safedup(string);
*p = ch;
while( isspace(*p) ) p++;
/* skip potential sub-addresses ("/<something>/") */
if ( *p == '/' )
{
p++;
while ( *p != '\0' && *p != '/' ) { p++; }
if ( *p != '\0' ) p++;
}
string = p;
}
if ( strncmp( string, "TO:", 3 ) == 0 ) /* target msn */
{
return find_msn( string+3, msn_list );
}
return 0; /* unspecified */
}
/* handle V.253 DRON/DROF result codes
* (signalling "Ring ON" / "Ring OFf" time)
*
* basically we build a binary word from the RINGs, and use that as
* distinctive RING number. "Long" = 1, "Short" = 0
*
* the very first code (always DROF) is always "long".
*
* example cadence (standard verizon "one long RING" call):
* DROF=0
* DRON=11
* RING
* DROF=40
* DRON=20
* RING
*/
static int drox_bitstring;
static int drox_count;
static void ring_handle_DROx( char * p )
{
int len, bit;
/* skip whitespace and '=' (covers "DRON=nnn" and "DRON = nnn")
*/
while( isspace(*p) || *p == '=' ) { p++; }
len = atoi( p );
bit = ( drox_count == 0 || len > 9 ) ? 1 : 0;
lputs( L_NOISE, bit? "<long>": "<short>" );
drox_bitstring = (drox_bitstring << 1 ) | bit;
drox_count++;
}
static boolean chat_has_timeout;
static RETSIGTYPE chat_timeout(SIG_HDLR_ARGS)
{
chat_has_timeout = TRUE;
}
extern boolean virtual_ring;
int wait_for_ring _P6((fd, msn_list, timeout,
actions, action, dist_ring_number),
int fd, char ** msn_list, int timeout,
chat_action_t actions[], action_t * action,
int * dist_ring_number )
{
#define BUFSIZE 500
char buf[BUFSIZE], ch, *p;
int i, w, r;
int rc = SUCCESS;
boolean got_dle; /* for <DLE><char> events (voice mode) */
lprintf( L_MESG, "wfr: waiting for ``RING''" );
lprintf( L_NOISE, "got: ");
w=0;
got_dle = FALSE;
signal( SIGALRM, chat_timeout );
alarm( timeout );
chat_has_timeout = FALSE;
while(TRUE)
{
if ( virtual_ring )
{
lputs( L_NOISE, "``found''" );
break;
}
r = mdm_read_byte( fd, &ch );
if ( r <= 0 ) /* unsuccessful */
{
if ( chat_has_timeout ) /* timeout */
lprintf( L_WARN, "wfr: timeout waiting for RING" );
else
lprintf( L_ERROR, "wfr: error in read()" );
if ( action != NULL ) *action = A_TIMOUT;
rc = FAIL; break;
}
lputc( L_NOISE, ch );
/* In voice mode, modems send <DLE><x> sequences to signal
* certain events, among them (IS-101) "RING".
*/
if ( got_dle ) /* last char was <DLE> */
{
switch( ch )
{
case 'h':
case 'p': /* handset on hook */
case 'H':
case 'P': /* handset off hook */
case 'r': /* ringback detected */
*dist_ring_number = - (int)ch;
goto have_ring; break;
case 'R': /* RING detected */
*dist_ring_number = 0;
goto have_ring; break;
default:
got_dle = FALSE;
}
}
else
if ( ch == DLE ) got_dle = TRUE;
/* line termination character? no -> add to buffer and go on */
if ( ch != '\r' && ch != '\n' )
{
/* skip whitespace at start of buffer */
if ( w == 0 && isspace(ch) ) continue;
/* add character to buffer */
if( w < BUFSIZ-2 )
buf[w++] = ch;
/* check for "actions" */
if ( actions != NULL )
for( i=0; actions[i].expect != NULL; i++ )
{
int len = strlen( actions[i].expect );
if ( w == len &&
memcmp( buf, actions[i].expect, len ) == 0 )
{
lprintf( L_MESG, "wfr: found action string: ``%s''",
actions[i].expect );
*action = actions[i].action;
rc = FAIL; break;
}
}
if ( rc == FAIL ) break; /* break out of while() */
/* go on */
continue;
}
/* got a full line */
if ( w == 0 ) { continue; } /* ignore empty lines */
buf[w] = '\0';
cndfind( buf ); /* grab caller ID */
/* ZyXEL CallerID/MSN display? */
if ( strncmp( buf, "FM:", 3 ) == 0 ||
strncmp( buf, "TO:", 3 ) == 0 )
{ *dist_ring_number = ring_handle_ZyXEL( buf, msn_list ); break; }
/* Rockwell (et al) caller ID - handled by cndfind(), but
* we count it as "RING" to be able to pick up immediately
* instead of waiting for the next "real" RING
* (but don't do this for V253 DRON/DROF modems!)
*/
if ( strncmp( buf, "NMBR", 4 ) == 0 && drox_count == 0 ) { break; }
/* V.253 ring cadences */
if ( strncmp( buf, "DRON", 4 ) == 0 ||
strncmp( buf, "DROF", 4 ) == 0 )
{ ring_handle_DROx( buf+4 ); w=0; continue; }
/* now check the different RING types
* if not "RING<whatever>", clear buffer and get next line
*/
if ( strncmp( buf, "RING", 4 ) != 0 )
{ w = 0; lprintf( L_NOISE, "got: " ); continue; }
p=&buf[4];
while( isspace(*p) ) p++;
if ( *p == '\0' ) /* "classic RING" */
{ break; }
if ( *p == ';' ) /* ELSA type */
{ *dist_ring_number = ring_handle_ELSA( p, msn_list ); break; }
if ( *p== ':' ) /* Zoom MX type */
{ *dist_ring_number = ring_handle_ZoomMX( p ); break; }
if ( strlen(p) > 1 ) /* USR type B: "RING 1234" */
{ *dist_ring_number = ring_handle_ELSA( p, msn_list ); break; }
if ( isdigit( *p ) ) /* RING 1 */
{ *dist_ring_number = *p-'0'; break; }
if ( isalpha( *p ) ) /* RING A */
{ *dist_ring_number = tolower(*p)-'a' +1; break; }
}
have_ring:
alarm(0);
if ( drox_count > 0 )
{
lprintf( L_NOISE, "wfr: DRON/DROF cadence: %x", drox_bitstring );
*dist_ring_number = drox_bitstring;
drox_count=0; drox_bitstring=0;
}
lprintf( L_NOISE, "wfr: rc=%d, drn=%d", rc, *dist_ring_number );
return rc;
}
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