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#ident "$Id: modem.c,v 4.4 1997/12/05 23:48:08 gert Exp $ Copyright (c) Gert Doering"
/* modem.c
*
* Module containing *very* basic modem functions
* - send a command
* - get a response back from the modem
* - send a command, wait for OK/ERROR response
*/
#include <stdio.h>
#include <unistd.h>
#include <ctype.h>
#include <string.h>
#include <signal.h>
#include <errno.h>
#include "mgetty.h"
#include "policy.h"
/* get one line from the modem, only printable characters, terminated
* by \r or \n. The termination character is *not* included
*/
char * mdm_get_line _P1( (fd), int fd )
{
static char buffer[200];
int bufferp;
char c;
bufferp = 0;
lprintf( L_JUNK, "got:" );
do
{
if( mdm_read_byte( fd, &c ) != 1 )
{
lprintf( L_ERROR, "mdm_get_line: cannot read byte, return" );
return NULL;
}
lputc( L_JUNK, c );
if ( isprint( c ) &&
bufferp < sizeof(buffer) )
{
buffer[ bufferp++ ] = c;
}
}
while ( bufferp == 0 || ( c != 0x0a && c != 0x0d ) );
buffer[bufferp] = 0;
return buffer;
}
/* wait for a given modem response string,
* handle all the various class 2 / class 2.0 status responses
*/
static boolean fwf_timeout = FALSE;
static RETSIGTYPE fwf_sig_alarm(SIG_HDLR_ARGS) /* SIGALRM handler */
{
signal( SIGALRM, fwf_sig_alarm );
lprintf( L_WARN, "Warning: got alarm signal!" );
fwf_timeout = TRUE;
}
/* send a command string to the modem, terminated with the
* MODEM_CMD_SUFFIX character / string from policy.h
*/
int mdm_send _P2( (send, fd),
char * send, int fd )
{
#ifdef DO_CHAT_SEND_DELAY
delay(DO_CHAT_SEND_DELAY);
#endif
lprintf( L_MESG, "mdm_send: '%s'", send );
if ( write( fd, send, strlen( send ) ) != strlen( send ) ||
write( fd, MODEM_CMD_SUFFIX, sizeof(MODEM_CMD_SUFFIX)-1 ) !=
( sizeof(MODEM_CMD_SUFFIX)-1 ) )
{
lprintf( L_ERROR, "mdm_send: cannot write" );
return ERROR;
}
return NOERROR;
}
/* simple send / expect sequence, for things that do not require
* parsing of the modem responses, or where the side-effects are
* unwanted.
*/
int mdm_command _P2( (send, fd), char * send, int fd )
{
char * l;
if ( mdm_send( send, fd ) == ERROR ) return ERROR;
/* wait for OK or ERROR, *without* side effects (as fax_wait_for
* would have)
*/
signal( SIGALRM, fwf_sig_alarm ); alarm(10); fwf_timeout = FALSE;
do
{
l = mdm_get_line( fd );
if ( l == NULL ) break;
lprintf( L_NOISE, "mdm_command: string '%s'", l );
}
while ( strcmp( l, "OK" ) != 0 && strcmp( l, "ERROR" ) != 0 );
alarm(0); signal( SIGALRM, SIG_DFL );
if ( l == NULL || strcmp( l, "ERROR" ) == 0 )
{
lputs( L_MESG, " -> ERROR" );
return ERROR;
}
lputs( L_MESG, " -> OK" );
return NOERROR;
}
/* mdm_read_byte
* read one byte from "fd", with buffering
* caveat: only one fd allowed (only one buffer), no way to flush buffers
*/
int mdm_read_byte _P2( (fd, c),
int fd, char * c )
{
static char frb_buf[512];
static int frb_rp = 0;
static int frb_len = 0;
if ( frb_rp >= frb_len )
{
frb_len = read( fd, frb_buf, sizeof( frb_buf ) );
if ( frb_len <= 0 )
{
if ( frb_len == 0 ) errno = 0; /* undefined otherwise */
lprintf( L_ERROR, "mdm_read_byte: read returned %d", frb_len );
return frb_len;
}
frb_rp = 0;
}
*c = frb_buf[ frb_rp++ ];
return 1;
}
/* for modem identify (and maybe other nice purposes, who knows)
* this function is handy:
* - send some AT command, wait for OK/ERROR or 10 seconds timeout
* - return a pointer to a static buffer holding the "nth" non-empty
* answer line from the modem (for multi-line responses), or the
* last line if n==-1
*/
char * mdm_get_idstring _P3( (send, n, fd), char * send, int n, int fd )
{
char * l; int i;
static char rbuf[80];
if ( mdm_send( send, fd ) == ERROR ) return "<ERROR>";
/* wait for OK or ERROR, *without* side effects (as fax_wait_for
* would have)
*/
signal( SIGALRM, fwf_sig_alarm ); alarm(10); fwf_timeout = FALSE;
i=0;
rbuf[0] = '\0';
while(1)
{
l = mdm_get_line( fd );
if ( l == NULL ) break; /* error */
if ( strcmp( l, send ) == 0 ) continue; /* command echo */
if ( strcmp( l, "OK" ) == 0 || /* final string */
strcmp( l, "ERROR" ) == 0 ) break;
i++;
lprintf( L_NOISE, "mdm_gis: string %d: '%s'", i, l );
if ( i==-1 || i==n ) /* copy string */
{ strncpy( rbuf, l, sizeof(rbuf)-1); rbuf[sizeof(rbuf)-1]='\0'; }
}
alarm(0); signal( SIGALRM, SIG_DFL );
if ( l == NULL ) return "<ERROR>"; /* error */
return rbuf;
}
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