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sim_tmxr.c
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/* sim_tmxr.c: Telnet terminal multiplexer library
Copyright (c) 2001-2011, Robert M Supnik
Permission is hereby granted, free of charge, to any person obtaining a
copy of this software and associated documentation files (the "Software"),
to deal in the Software without restriction, including without limitation
the rights to use, copy, modify, merge, publish, distribute, sublicense,
and/or sell copies of the Software, and to permit persons to whom the
Software is furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL
ROBERT M SUPNIK BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of Robert M Supnik shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from Robert M Supnik.
Based on the original DZ11 simulator by Thord Nilson, as updated by
Arthur Krewat.
12-Oct-12 MP Revised serial port support to not require changes to
any code in TMXR library using code. Added support
for per line listener ports and outgoing tcp connections.
02-Jun-11 MP Fixed telnet option negotiation loop with some clients
Added Option Negotiation and Debugging Support
17-Jan-11 MP Added Buffered line capabilities
16-Jan-11 MP Made option negotiation more reliable
20-Nov-08 RMS Added three new standardized SHOW routines
05-Nov-08 JDB Moved logging call after connection check in tmxr_putc_ln
03-Nov-08 JDB Added TMXR null check to tmxr_find_ldsc
07-Oct-08 JDB Added initial serial port support
30-Sep-08 JDB Reverted tmxr_find_ldsc to original implementation
27-May-08 JDB Added line connection order to tmxr_poll_conn,
added tmxr_set_lnorder and tmxr_show_lnorder
14-May-08 JDB Print device and line to which connection was made
11-Apr-07 JDB Worked around Telnet negotiation problem with QCTerm
16-Aug-05 RMS Fixed C++ declaration and cast problems
29-Jun-05 RMS Extended tmxr_dscln to support unit array devices
Fixed bug in SET LOG/NOLOG
04-Jan-04 RMS Changed TMXR ldsc to be pointer to linedesc array
Added tmxr_linemsg, circular output pointers, logging
(from Mark Pizzolato)
29-Dec-03 RMS Added output stall support
01-Nov-03 RMS Cleaned up attach routine
09-Mar-03 RMS Fixed bug in SHOW CONN
22-Dec-02 RMS Fixed bugs in IAC+IAC receive and transmit sequences
Added support for received break (all from by Mark Pizzolato)
Fixed bug in attach
31-Oct-02 RMS Fixed bug in 8b (binary) support
22-Aug-02 RMS Added tmxr_open_master, tmxr_close_master
30-Dec-01 RMS Added tmxr_fstats, tmxr_dscln, renamed tmxr_fstatus
03-Dec-01 RMS Changed tmxr_fconns for extended SET/SHOW
20-Oct-01 RMS Fixed bugs in read logic (found by Thord Nilson).
Added tmxr_rqln, tmxr_tqln
This library includes:
tmxr_poll_conn - poll for connection
tmxr_reset_ln - reset line (drops Telnet/tcp and serial connections)
tmxr_detach_ln - reset line and close per line listener and outgoing destination
tmxr_getc_ln - get character for line
tmxr_get_packet_ln - get packet from line
tmxr_get_packet_ln_ex - get packet from line with separater byte
tmxr_poll_rx - poll receive
tmxr_putc_ln - put character for line
tmxr_put_packet_ln - put packet on line
tmxr_put_packet_ln_ex - put packet on line with separator byte
tmxr_poll_tx - poll transmit
tmxr_send_buffered_data - transmit buffered data
tmxr_set_modem_control_passthru - enable modem control on a multiplexer
tmxr_clear_modem_control_passthru - disable modem control on a multiplexer
tmxr_set_port_speed_control - Declare that tmxr_set_config_line is used
tmxr_clear_port_speed_control - Declare that tmxr_set_config_line is not used
tmxr_set_line_port_speed_control - Declare that tmxr_set_config_line is used for line
tmxr_clear_line_port_speed_control - Declare that tmxr_set_config_line is not used for line
tmxr_set_get_modem_bits - set and/or get a line modem bits
tmxr_set_line_loopback - enable or disable loopback mode on a line
tmxr_get_line_loopback - returns the current loopback status of a line
tmxr_set_line_halfduplex - enable or disable halfduplex mode on a line
tmxr_get_line_halfduplex - returns the current halfduplex status of a line
tmxr_set_config_line - set port speed, character size, parity and stop bits
tmxr_open_master - open master connection
tmxr_close_master - close master connection
tmxr_attach - attach terminal multiplexor to listening port
tmxr_detach - detach terminal multiplexor to listening port
tmxr_attach_help - help routine for attaching multiplexer devices
tmxr_set_line_unit - set the unit which polls for input for a given line
tmxr_ex - (null) examine
tmxr_dep - (null) deposit
tmxr_msg - send message to socket
tmxr_linemsg - send message to line
tmxr_linemsgf - send formatted message to line
tmxr_fconns - output connection status
tmxr_fstats - output connection statistics
tmxr_set_log - enable logging for line
tmxr_set_nolog - disable logging for line
tmxr_show_log - show logging status for line
tmxr_dscln - disconnect line (SET routine)
tmxr_rqln - number of available characters for line
tmxr_tqln - number of buffered characters for line
tmxr_tpqln - number of buffered packet characters for line
tmxr_tpbusyln - transmit packet busy status for line
tmxr_set_lnorder - set line connection order
tmxr_show_lnorder - show line connection order
tmxr_show_summ - show connection summary
tmxr_show_cstat - show line connections or status
tmxr_show_lines - show number of lines
tmxr_show_open_devices - show info about all open tmxr devices
All routines are OS-independent.
This library supports the simulation of multiple-line terminal multiplexers.
It may also be used to create single-line "multiplexers" to provide
additional terminals beyond the simulation console. It may also be used to
create single-line or multi-line simulated synchronous (BiSync) devices.
Multiplexer lines may be connected to terminal emulators supporting the
Telnet protocol via sockets, or to hardware terminals via host serial
ports. Concurrent Telnet and serial connections may be mixed on a given
multiplexer.
When connecting via sockets, the simulated multiplexer is attached to a
listening port on the host system:
sim> attach MUX 23
Listening on port 23
Once attached, the listening port must be polled for incoming connections.
When a connection attempt is received, it will be associated with the next
multiplexer line in the user-specified line order, or with the next line in
sequence if no order has been specified. Individual lines may be connected
to serial ports or remote systems via TCP (telnet or not as desired), OR
they may have separate listening TCP ports.
Logging of Multiplexer Line output:
The traffic going out multiplexer lines can be logged to files. A single
line multiplexer can log it's traffic with the following command:
sim> atta MUX 23,Log=LogFileName
sim> atta MUX Connect=ser0,Log=LogFileName
Specifying a Log value for a multi-line multiplexer is specifying a
template filename. The actual file name used for each line will be
the indicated filename with _n appended (n being the line number).
Buffered Multiplexer Line:
A Multiplexer Line Buffering has been implemented. A Buffered Line will
have a copy of the last 'buffer size' bytes of output retained in a line
specific buffer. The contents of this buffer will be transmitted out any
new connection on that line when a new telnet session is established.
This capability is most useful for the Console Telnet session. When a
Console Telnet session is Buffered, a simulator will start (via BOOT CPU
or whatever is appropriate for a particular simulator) without needing to
have an active telnet connection. When a Telnet connection comes along
for the telnet port, the contents of the saved buffer (which wraps on
overflow) are presented on the telnet session as output before session
traffic. This allows the connecting telnet client to see what happened
before he connected since the likely reason he might be connecting to the
console of a background simulator is to troubleshoot unusual behavior,
the details of which may have already been sent to the console.
Serial Port support:
Serial ports may be specified as an operating system specific device names
or using simh generic serial names. simh generic names are of the form
serN, where N is from 0 thru one less than the maximum number of serial
ports on the local system. The mapping of simh generic port names to OS
specific names can be displayed using the following command:
sim> show serial
Serial devices:
ser0 COM1 (\Device\Serial0)
ser1 COM3 (Winachcf0)
sim> attach MUX Line=2,Connect=ser0
or equivalently
sim> attach MUX Line=2,Connect=COM1
An optional configuration string may be present after the port name. If
present, it must be separated from the port name with a semicolon and has
this form:
<rate>-<charsize><parity><stopbits>
where:
rate = communication rate in bits per second
charsize = character size in bits (5-8, including optional parity)
parity = parity designator (N/E/O/M/S for no/even/odd/mark/space parity)
stopbits = number of stop bits (1, 1.5, or 2)
As an example:
9600-8n1
The supported rates, sizes, and parity options are host-specific. If
a configuration string is not supplied, then the default of 9600-8N1
is used.
An attachment to a serial port with the '-V' switch will cause a
connection message to be output to the connected serial port.
This will help to confirm the correct port has been connected and
that the port settings are reasonable for the connected device.
This would be done as:
sim> attach -V MUX Connect=SerN
Line specific tcp listening ports are supported. These are configured
using commands of the form:
sim> attach MUX Line=2,port{;notelnet}|{;nomessage}
Direct computer to computer connections (Virutal Null Modem cables) may
be established using the telnet protocol or via raw tcp sockets.
sim> attach MUX Line=2,Connect=host:port{;notelnet}
Computer to computer virtual connections can be one way (as illustrated
above) or symmetric. A symmetric connection is configured by combining
a one way connection with a tcp listening port on the same line:
sim> attach MUX Line=2,Connect=host:port,listenport
When symmetric virtual connections are configured, incoming connections
on the specified listening port are checked to assure that they actually
come from the specified connection destination host system.
The command syntax for a single line device (MX) is:
sim> attach MX port{;notelnet}|{;nomessage}
sim> attach MX Connect=serN{;config}
sim> attach MX Connect=COM9{;config}
sim> attach MX Connect=host:port{;notelnet}|{;nomessage}
The command syntax for ANY multi-line device is:
sim> attach MX port{;notelnet}|{;nomessage} ; Defines the master listening port for the mux and optionally allows non-telnet (i.e. raw socket) operation for all lines.
sim> attach MX Line=n,port{;notelnet}|{;nomessage} ; Defines a line specific listen port for a particular line. Each line can have a separate listen port and the mux can have its own as well. Optionally disable telnet wire protocol (i.e. raw socket)
sim> attach MX Line=n,Connect=serN{;config} ; Connects line n to simh generic serial port N (port list visible with the sim> SHOW SERIAL command), the optional ";config" data specifies the speed, parity and stop bits for the connection
; DTR (and RTS) will be raised at attach time and will drop at detach/disconnect time
sim> attach MX Line=n,Connect=host:port{;notelnet} ; Causes a connection to be established to the designated host:port. The actual connection will happen in a non-blocking fashion and will be completed and/or re-established by the normal tmxr_poll_conn activities
All connections configured for any multiplexer device are unconfigured by:
sim> detach MX ; detaches ALL connections/ports/sessions on the MUX.
Console serial connections are achieved by:
sim> set console serial=serN{;config}
or
sim> set console serial=COM2{;config}
A line specific listening port (12366) can be specified by the following:
sim> attach MUX Line=2,12366
A line specific remote telnet (or raw tcp) destination can be specified
by the following:
sim> attach MUX Line=2,Connect=remotehost:port
If a connection to a remotehost:port wants a raw binary data channel
(instead of a telnet session) the following would be used:
sim> attach MUX Line=2,Connect=remotehost:port;notelnet
A single line multiplexor can indicate any of the above line options
without specifying a line number:
sim> attach MUX Connect=ser0;9600-8N1
sim> attach MUX 12366{;notelnet}|{;nomessage}
sim> attach MUX Connect=remotehost:port
sim> attach MUX Connect=remotehost:port;notelnet
A multiplexor can disconnect all (telnet, serial and outgoing) previous
attachments with:
sim> detach MUX
A device emulation may choose to implement a command interface to
disconnect specific individual lines. This would usually be done via
a Unit Modifier table entry (MTAB) which dispatches the command
"SET dev DISCONNECT[=line]" to tmxr_dscln. This will cause a telnet
connection to be closed, but a serial port will normally have DTR
dropped for 500ms and raised again (thus hanging up a modem on that
serial port).
sim> set MUX disconnect=2
Full Modem Control serial port support.
This library supports devices which wish to emulate full modem
control/signalling for serial ports. Any device emulation which wishes
to support this functionality for attached serial ports must call
"tmxr_set_modem_control_passthru" before any call to tmxr_attach.
This disables automatic DTR (&RTS) manipulation by this library.
Responsibility for manipulating DTR falls on the simulated operating
system. Calling tmxr_set_modem_control_passthru would usually be in
a device reset routine. It may also be called by a device attach
routine based on user specified options.
Once support for full modem control has been declared by a device
emulation for a particular TMXR device, this library will make no
direct effort to manipulate modem bits while connected to serial ports.
The "tmxr_set_get_modem_bits" API exists to allow the device emulation
layer to query and control modem signals. The "tmxr_set_config_line"
API exists to allow the device emulation layer to change port settings
(baud rate, parity and stop bits). A modem_control enabled line
merely passes the VM's port status bits, data and settings through to
and from the serial port.
The "tmxr_set_get_modem_bits" and "tmxr_set_config_line" APIs will
ONLY work on a modem control enabled TMXR device.
*/
#define NOT_MUX_USING_CODE /* sim_tmxr library define */
#include "sim_defs.h"
#include "sim_serial.h"
#include "sim_sock.h"
#include "sim_timer.h"
#include "sim_tmxr.h"
#include "scp.h"
#define MIN(a,b) (((a) < (b)) ? (a) : (b))
#include <ctype.h>
#include <math.h>
/* Telnet protocol constants - negatives are for init'ing signed char data */
/* Commands */
#define TN_IAC 0xFFu /* -1 */ /* protocol delim */
#define TN_DONT 0xFEu /* -2 */ /* dont */
#define TN_DO 0xFDu /* -3 */ /* do */
#define TN_WONT 0xFCu /* -4 */ /* wont */
#define TN_WILL 0xFBu /* -5 */ /* will */
#define TN_SB 0xFAu /* -6 */ /* sub-option negotiation */
#define TN_GA 0xF9u /* -7 */ /* go ahead */
#define TN_EL 0xF8u /* -8 */ /* erase line */
#define TN_EC 0xF7u /* -9 */ /* erase character */
#define TN_AYT 0xF6u /* -10 */ /* are you there */
#define TN_AO 0xF5u /* -11 */ /* abort output */
#define TN_IP 0xF4u /* -12 */ /* interrupt process */
#define TN_BRK 0xF3u /* -13 */ /* break */
#define TN_DATAMK 0xF2u /* -14 */ /* data mark */
#define TN_NOP 0xF1u /* -15 */ /* no operation */
#define TN_SE 0xF0u /* -16 */ /* end sub-option negot */
/* Options */
#define TN_BIN 0 /* bin */
#define TN_ECHO 1 /* echo */
#define TN_SGA 3 /* sga */
#define TN_STATUS 5 /* option status query */
#define TN_TIMING 6 /* Timing Mark */
#define TN_NAOCRD 10 /* Output Carriage-Return Disposition */
#define TN_NAOHTS 11 /* Output Horizontal Tab Stops */
#define TN_NAOHTD 12 /* Output Horizontal Tab Stop Disposition */
#define TN_NAOFFD 13 /* Output Forfeed Disposition */
#define TN_NAOVTS 14 /* Output Vertical Tab Stop */
#define TN_NAOVTD 15 /* Output Vertical Tab Stop Disposition */
#define TN_NAOLFD 16 /* Output Linefeed Disposition */
#define TN_EXTEND 17 /* Extended Ascii */
#define TN_LOGOUT 18 /* Logout */
#define TN_BM 19 /* Byte Macro */
#define TN_DET 20 /* Data Entry Terminal */
#define TN_SENDLO 23 /* Send Location */
#define TN_TERMTY 24 /* Terminal Type */
#define TN_ENDREC 25 /* Terminal Type */
#define TN_TUID 26 /* TACACS User Identification */
#define TN_OUTMRK 27 /* Output Marking */
#define TN_TTYLOC 28 /* Terminal Location Number */
#define TN_3270 29 /* 3270 Regime */
#define TN_X3PAD 30 /* X.3 PAD */
#define TN_NAWS 31 /* Negotiate About Window Size */
#define TN_TERMSP 32 /* Terminal Speed */
#define TN_TOGFLO 33 /* Remote Flow Control */
#define TN_LINE 34 /* line mode */
#define TN_XDISPL 35 /* X Display Location */
#define TN_ENVIRO 36 /* Environment */
#define TN_AUTH 37 /* Authentication */
#define TN_ENCRYP 38 /* Data Encryption */
#define TN_NEWENV 39 /* New Environment */
#define TN_TN3270 40 /* TN3270 Enhancements */
#define TN_CHARST 42 /* CHARSET */
#define TN_COMPRT 44 /* Com Port Control */
#define TN_KERMIT 47 /* KERMIT */
#define TN_CR 015 /* carriage return */
#define TN_LF 012 /* line feed */
#define TN_NUL 000 /* null */
/* Telnet line states */
#define TNS_NORM 000 /* normal */
#define TNS_IAC 001 /* IAC seen */
#define TNS_WILL 002 /* WILL seen */
#define TNS_WONT 003 /* WONT seen */
#define TNS_SKIP 004 /* skip next cmd */
#define TNS_CRPAD 005 /* CR padding */
#define TNS_DO 006 /* DO request pending rejection */
/* Telnet Option Sent Flags */
#define TNOS_DONT 001 /* Don't has been sent */
#define TNOS_WONT 002 /* Won't has been sent */
static BITFIELD tmxr_modem_bits[] = {
BIT(DTR), /* Data Terminal Ready */
BIT(RTS), /* Request To Send */
BIT(DCD), /* Data Carrier Detect */
BIT(RNG), /* Ring Indicator */
BIT(CTS), /* Clear To Send */
BIT(DSR), /* Data Set Ready */
ENDBITS
};
static u_char mantra[] = { /* Telnet Option Negotiation Mantra */
TN_IAC, TN_WILL, TN_LINE,
TN_IAC, TN_WILL, TN_SGA,
TN_IAC, TN_WILL, TN_ECHO,
TN_IAC, TN_WILL, TN_BIN,
TN_IAC, TN_DO, TN_BIN
};
#define TMXR_GUARD ((int32)(lp->serport ? 1 : sizeof(mantra)))/* buffer guard */
#define TMXR_LINE_DISABLED (-1)
/* Local routines */
static void tmxr_add_to_open_list (TMXR* mux);
/* Initialize the line state.
Reset the line state to represent an idle line. Note that we do not clear
all of the line structure members, so a connected line remains connected
after this call.
Because a line break is represented by a flag in the "receive break status"
array, we must zero that array in order to clear any pending break
indications.
*/
static void tmxr_init_line (TMLN *lp)
{
lp->tsta = 0; /* init telnet state */
lp->xmte = 1; /* enable transmit */
lp->dstb = 0; /* default bin mode */
lp->rxbpr = lp->rxbpi = lp->rxcnt = lp->rxpcnt = 0; /* init receive indexes */
if (!lp->txbfd || lp->notelnet) /* if not buffered telnet */
lp->txbpr = lp->txbpi = lp->txcnt = lp->txpcnt = 0; /* init transmit indexes */
lp->txdrp = lp->txstall = 0;
tmxr_set_get_modem_bits (lp, 0, 0, NULL);
if (lp->mp && (!lp->mp->buffered) && (!lp->txbfd)) {
lp->txbfd = 0;
lp->txbsz = TMXR_MAXBUF;
lp->txb = (char *)realloc (lp->txb, lp->txbsz);
lp->rxbsz = TMXR_MAXBUF;
lp->rxb = (char *)realloc(lp->rxb, lp->rxbsz);
lp->rbr = (char *)realloc(lp->rbr, lp->rxbsz);
}
if (lp->loopback) {
lp->lpbsz = lp->rxbsz;
lp->lpb = (char *)realloc(lp->lpb, lp->lpbsz);
lp->lpbcnt = lp->lpbpi = lp->lpbpr = 0;
}
if (lp->rxpb) {
lp->rxpboffset = lp->rxpbsize = 0;
free (lp->rxpb);
lp->rxpb = NULL;
}
if (lp->txpb) {
lp->txpbsize = lp->txppsize = lp->txppoffset = 0;
free (lp->txpb);
lp->txpb = NULL;
}
memset (lp->rbr, 0, lp->rxbsz); /* clear break status array */
}
/* Report a connection to a line.
If the indicated line (lp) is speaking the telnet wire protocol, a
notification of the form:
Connected to the <sim> simulator <dev> device, line <n>
is sent to the newly connected line. If the device has only one line, the
"line <n>" part is omitted. If the device has not been defined, the "<dev>
device" part is omitted.
*/
static void tmxr_report_connection (TMXR *mp, TMLN *lp)
{
int32 unwritten, psave;
char cmsg[160];
char dmsg[80] = "";
char lmsg[80] = "";
char msgbuf[512] = "";
if (((!lp->notelnet) && (!lp->nomessage)) || (sim_switches & SWMASK ('V'))) {
sprintf (cmsg, "\n\r\nConnected to the %s simulator ", sim_name);
if (mp->dptr) { /* device defined? */
sprintf (dmsg, "%s device", /* report device name */
sim_dname (mp->dptr));
if (mp->lines > 1) /* more than one line? */
sprintf (lmsg, ", line %d", (int)(lp-mp->ldsc));/* report the line number */
}
sprintf (msgbuf, "%s%s%s\r\n\n", cmsg, dmsg, lmsg);
}
if (!mp->buffered) {
lp->txbpi = 0; /* init buf pointers */
lp->txbpr = (int32)(lp->txbsz - strlen (msgbuf));
lp->rxcnt = lp->txcnt = lp->txdrp = lp->txstall = 0;/* init counters */
lp->rxpcnt = lp->txpcnt = 0;
}
else
if (lp->txcnt > lp->txbsz)
lp->txbpr = (lp->txbpi + 1) % lp->txbsz;
else
lp->txbpr = (int32)(lp->txbsz - strlen (msgbuf));
psave = lp->txbpi; /* save insertion pointer */
lp->txbpi = lp->txbpr; /* insert connection message */
if ((lp->serport) && (!sim_is_running)) {
sim_os_ms_sleep (TMXR_DTR_DROP_TIME); /* Wait for DTR to be noticed */
lp->ser_connect_pending = FALSE; /* Mark line as ready for action */
lp->conn = TRUE;
}
tmxr_linemsg (lp, msgbuf); /* beginning of buffer */
lp->txbpi = psave; /* restore insertion pointer */
unwritten = tmxr_send_buffered_data (lp); /* send the message */
if ((lp->serport) && (!sim_is_running)) {
lp->ser_connect_pending = TRUE; /* Mark line as not yet ready for action */
lp->conn = FALSE;
}
if (unwritten == 0) /* buffer now empty? */
lp->xmte = 1; /* reenable transmission if paused */
lp->txcnt -= (int32)strlen (msgbuf); /* adjust statistics */
}
/* Report a disconnection to a line.
A notification of the form:
Disconnected from the <sim> simulator
is sent to the line about to be disconnected. We do not flush the buffer
here, because the disconnect routines will do that just after calling us.
*/
static void tmxr_report_disconnection (TMLN *lp)
{
if (lp->notelnet || lp->nomessage)
return;
tmxr_linemsgf (lp, "\r\nDisconnected from the %s simulator\r\n\n", sim_name);/* report disconnection */
}
static int32 loop_write_ex (TMLN *lp, char *buf, int32 length, t_bool prefix_datagram)
{
int32 written = 0;
int32 loopfree = lp->lpbsz - lp->lpbcnt;
if (lp->datagram && prefix_datagram) {
if ((size_t)loopfree < (size_t)(length + sizeof(length)))
return written;
loop_write_ex (lp, (char *)&length, sizeof(length), FALSE);
}
while (length) {
int32 chunksize;
loopfree = lp->lpbsz - lp->lpbcnt;
if (loopfree == 0)
break;
if (loopfree < length)
length = loopfree;
if (lp->lpbpi >= lp->lpbpr)
chunksize = lp->lpbsz - lp->lpbpi;
else
chunksize = lp->lpbpr - lp->lpbpi;
if (chunksize > length)
chunksize = length;
memcpy (&lp->lpb[lp->lpbpi], buf, chunksize);
buf += chunksize;
length -= chunksize;
written += chunksize;
lp->lpbpi = (lp->lpbpi + chunksize) % lp->lpbsz;
}
lp->lpbcnt += written;
return written;
}
static int32 loop_write (TMLN *lp, char *buf, int32 length)
{
return loop_write_ex (lp, buf, length, TRUE);
}
static int32 loop_read_ex (TMLN *lp, char *buf, int32 bufsize)
{
int32 bytesread = 0;
while (bufsize > 0) {
int32 chunksize;
int32 loopused = lp->lpbcnt;
if (loopused < bufsize)
bufsize = loopused;
if (loopused == 0)
break;
if (lp->lpbpi > lp->lpbpr)
chunksize = lp->lpbpi - lp->lpbpr;
else
chunksize = lp->lpbsz - lp->lpbpr;
if (chunksize > bufsize)
chunksize = bufsize;
memcpy (buf, &lp->lpb[lp->lpbpr], chunksize);
buf += chunksize;
bufsize -= chunksize;
bytesread += chunksize;
lp->lpbpr = (lp->lpbpr + chunksize) % lp->lpbsz;
}
lp->lpbcnt -= bytesread;
return bytesread;
}
static int32 loop_read (TMLN *lp, char *buf, int32 bufsize)
{
if (lp->datagram) {
int32 pktsize;
if (lp->lpbcnt < (int32)sizeof(pktsize))
return 0;
if ((sizeof(pktsize) != loop_read_ex (lp, (char *)&pktsize, sizeof(pktsize))) ||
(pktsize > bufsize))
return -1;
bufsize = pktsize;
}
return loop_read_ex (lp, buf, bufsize);
}
/* Read from a line.
Up to "length" characters are read into the character buffer associated with
line "lp". The actual number of characters read is returned. If no
characters are available, 0 is returned. If an error occurred while reading,
-1 is returned.
If a line break was detected on serial input, the associated receive break
status flag will be set. Line break indication for Telnet connections is
embedded in the Telnet protocol and must be determined externally.
*/
static int32 tmxr_read (TMLN *lp, int32 length)
{
int32 i = lp->rxbpi;
if (lp->loopback)
return loop_read (lp, &(lp->rxb[i]), length);
if (lp->serport) /* serial port connection? */
return sim_read_serial (lp->serport, &(lp->rxb[i]), length, &(lp->rbr[i]));
else /* Telnet connection */
return sim_read_sock (lp->sock, &(lp->rxb[i]), length);
}
/* Write to a line.
Up to "length" characters are written from the character buffer associated
with "lp". The actual number of characters written is returned. If an error
occurred while writing, -1 is returned.
*/
static int32 tmxr_write (TMLN *lp, int32 length)
{
int32 written = 0;
int32 i = lp->txbpr;
if ((lp->txbps) && (sim_gtime () < lp->txnexttime) && (sim_is_running))
return 0;
if (lp->loopback)
return loop_write (lp, &(lp->txb[i]), length);
if (lp->serport) { /* serial port connection? */
written = sim_write_serial (lp->serport, &(lp->txb[i]), length);
}
else {
if (lp->sock) { /* Telnet connection */
written = sim_write_sock (lp->sock, &(lp->txb[i]), length);
if (written == SOCKET_ERROR) { /* did an error occur? */
lp->txdone = TRUE;
if (lp->datagram)
return written; /* ignore errors on datagram sockets */
else
return -1; /* return error indication */
}
}
else {
if ((lp->conn == TMXR_LINE_DISABLED) ||
((lp->conn == 0) && lp->txbfd)){
written = length; /* Count here output timing is correct */
if (lp->conn == TMXR_LINE_DISABLED)
lp->txdrp += length; /* Record as having been dropped on the floor */
}
}
}
if (written > 0) {
lp->txdone = FALSE;
if ((lp->txbps) && (sim_is_running))
lp->txnexttime = floor (sim_gtime () + ((written * lp->txdeltausecs * sim_timer_inst_per_sec ()) / USECS_PER_SECOND));
}
return written;
}
/* Remove a character from the read buffer.
The character at position "p" in the read buffer associated with line "lp" is
removed by moving all of the following received characters down one position.
The receive break status array is adjusted accordingly.
*/
static void tmxr_rmvrc (TMLN *lp, int32 p)
{
for ( ; p < lp->rxbpi; p++) { /* work from "p" through end of buffer */
lp->rxb[p] = lp->rxb[p + 1]; /* slide following character down */
lp->rbr[p] = lp->rbr[p + 1]; /* adjust break status too */
}
lp->rbr[p] = 0; /* clear potential break from vacated slot */
lp->rxbpi = lp->rxbpi - 1; /* drop buffer insert index */
}
/* Find a line descriptor indicated by unit or number.
If "uptr" is NULL, then the line descriptor is determined by the line number
passed in "val". If "uptr" is not NULL, then it must point to a unit
associated with a line, and the line descriptor is determined by the unit
number, which is derived by the position of the unit in the device's unit
array.
Note: This routine may be called with a UNIT that does not belong to the
device indicated in the TMXR structure. That is, the multiplexer lines may
belong to a device other than the one attached to the socket (the HP 2100 MUX
device is one example). Therefore, we must look up the device from the unit
at each call, rather than depending on the DEVICE pointer stored in the TMXR.
*/
static TMLN *tmxr_find_ldsc (UNIT *uptr, int32 val, const TMXR *mp)
{
if (mp == NULL) /* invalid multiplexer descriptor? */
return NULL; /* programming error! */
if (uptr) { /* called from SET? */
DEVICE *dptr = find_dev_from_unit (uptr); /* find device */
if (dptr == NULL) /* what?? */
return NULL;
val = (int32) (uptr - dptr->units); /* implicit line # */
}
if ((val < 0) || (val >= mp->lines)) /* invalid line? */
return NULL;
return mp->ldsc + val; /* line descriptor */
}
/* Get a line descriptor indicated by a string or unit.
A pointer to the line descriptor associated with multiplexer "mp" and unit
"uptr" or specified by string "cptr" is returned. If "uptr" is non-null,
then the unit number within its associated device implies the line number.
If "uptr" is null, then the string "cptr" is parsed for a decimal line
number. If the line number is missing, malformed, or outside of the range of
line numbers associated with "mp", then NULL is returned with status set to
SCPE_ARG.
Implementation note:
1. A return status of SCPE_IERR implies a programming error (passing an
invalid pointer or an invalid unit).
*/
static TMLN *tmxr_get_ldsc (UNIT *uptr, const char *cptr, TMXR *mp, t_stat *status)
{
t_value ln;
TMLN *lp = NULL;
t_stat code = SCPE_OK;
if (mp == NULL) /* missing mux descriptor? */
code = SCPE_IERR; /* programming error! */
else if (uptr) { /* implied line form? */
lp = tmxr_find_ldsc (uptr, mp->lines, mp); /* determine line from unit */
if (lp == NULL) /* invalid line number? */
code = SCPE_IERR; /* programming error! */
}
else if (cptr == NULL) /* named line form, parameter supplied? */
code = SCPE_MISVAL; /* no, so report missing */
else {
ln = get_uint (cptr, 10, mp->lines - 1, &code); /* get line number */
if (code == SCPE_OK) /* line number OK? */
lp = mp->ldsc + (int32) ln; /* use as index to determine line */
}
if (status) /* return value pointer supplied? */
*status = code; /* store return status value */
return lp; /* return pointer to line descriptor */
}
/* Generate the Attach string which will fully configure the multiplexer
Inputs:
old = pointer to the original configuration string which will be replaced
*mp = pointer to multiplexer
Output:
a complete attach string for the current state of the multiplexer
*/
static char *growstring(char **string, size_t growth)
{
*string = (char *)realloc (*string, 1 + (*string ? strlen (*string) : 0) + growth);
return *string + strlen(*string);
}
static char *tmxr_mux_attach_string(char *old, TMXR *mp)
{
char* tptr = NULL;
int32 i;
TMLN *lp;
free (old);
tptr = (char *) calloc (1, 1);
if (tptr == NULL) /* no more mem? */
return tptr;
if (mp->port) /* copy port */
sprintf (growstring(&tptr, 33 + strlen (mp->port)), "%s%s", mp->port,
mp->notelnet ? ";notelnet" :
(mp->nomessage ? ";nomessage" :
""));
if (mp->logfiletmpl[0]) /* logfile info */
sprintf (growstring(&tptr, 7 + strlen (mp->logfiletmpl)), ",Log=%s", mp->logfiletmpl);
if (mp->buffered)
sprintf (growstring(&tptr, 10 + 10), ",Buffered=%d", mp->buffered);
while ((*tptr == ',') || (*tptr == ' '))
memmove (tptr, tptr+1, strlen(tptr+1)+1);
for (i=0; i<mp->lines; ++i) {
char *lptr;
lp = mp->ldsc + i;
lptr = tmxr_line_attach_string(lp);
if (lptr) {
sprintf (growstring(&tptr, 10+strlen(lptr)), "%s%s", *tptr ? "," : "", lptr);
free (lptr);
}
}
if (mp->lines == 1)
while ((*tptr == ',') || (*tptr == ' '))
memmove (tptr, tptr+1, strlen(tptr+1)+1);
if (*tptr == '\0') {
free (tptr);
tptr = NULL;
}
return tptr;
}
/* Global routines */
/* Return the Line specific attach setup currently configured for a given line
Inputs:
*lp = pointer to terminal line descriptor
Outputs:
a string which can be used to reconfigure the line,
NULL if the line isn't configured
Note: The returned string is dynamically allocated memory and must be freed
when it is no longer needed by calling free
*/
char *tmxr_line_attach_string(TMLN *lp)
{
char* tptr = NULL;
tptr = (char *) calloc (1, 1);
if (tptr == NULL) /* no more mem? */
return tptr;
if (lp->destination || lp->port || lp->txlogname || (lp->conn == TMXR_LINE_DISABLED)) {
if ((lp->mp->lines > 1) || (lp->port))
sprintf (growstring(&tptr, 32), "Line=%d", (int)(lp-lp->mp->ldsc));
if (lp->conn == TMXR_LINE_DISABLED)
sprintf (growstring(&tptr, 32), ",Disabled");
if (lp->modem_control != lp->mp->modem_control)
sprintf (growstring(&tptr, 32), ",%s", lp->modem_control ? "Modem" : "NoModem");
if (lp->txbfd && (lp->txbsz != lp->mp->buffered))
sprintf (growstring(&tptr, 32), ",Buffered=%d", lp->txbsz);
if (!lp->txbfd && (lp->mp->buffered > 0))
sprintf (growstring(&tptr, 32), ",UnBuffered");
if (lp->mp->datagram != lp->datagram)
sprintf (growstring(&tptr, 8), ",%s", lp->datagram ? "UDP" : "TCP");
if (lp->mp->packet != lp->packet)
sprintf (growstring(&tptr, 8), ",Packet");
if (lp->port)
sprintf (growstring(&tptr, 32 + strlen (lp->port)), ",%s%s%s", lp->port,
((lp->mp->notelnet != lp->notelnet) && (!lp->datagram)) ? (lp->notelnet ? ";notelnet" : ";telnet") : "",
((lp->mp->nomessage != lp->nomessage) && (!lp->datagram)) ? (lp->nomessage ? ";nomessage" : ";message") : "");
if (lp->destination) {
if (lp->serport) {
char portname[CBUFSIZE];
get_glyph_nc (lp->destination, portname, ';');
sprintf (growstring(&tptr, 25 + strlen (lp->destination)), ",Connect=%s%s%s", portname, strcmp("9600-8N1", lp->serconfig ? lp->serconfig : "") ? ";" : "", strcmp("9600-8N1", lp->serconfig ? lp->serconfig : "") ? lp->serconfig : "");
}
else
sprintf (growstring(&tptr, 25 + strlen (lp->destination)), ",Connect=%s%s", lp->destination, ((lp->mp->notelnet != lp->notelnet) && (!lp->datagram)) ? (lp->notelnet ? ";notelnet" : ";telnet") : "");
}
if (lp->txlogname)
sprintf (growstring(&tptr, 12 + strlen (lp->txlogname)), ",Log=%s", lp->txlogname);
if (lp->loopback)
sprintf (growstring(&tptr, 12 ), ",Loopback");
}
if (*tptr == '\0') {
free (tptr);
tptr = NULL;
}
return tptr;
}
/*
Set the connection polling interval
*/
t_stat tmxr_connection_poll_interval (TMXR *mp, uint32 seconds)
{
if (0 == seconds)
return SCPE_ARG;
mp->poll_interval = seconds;
return SCPE_OK;
}
/* Poll for new connection
Called from unit service routine to test for new connection
Inputs:
*mp = pointer to terminal multiplexer descriptor
Outputs:
line number activated, -1 if none
If a connection order is defined for the descriptor, and the first value is
not -1 (indicating default order), then the order array is used to find an
open line. Otherwise, a search is made of all lines in numerical sequence.
*/
int32 tmxr_poll_conn (TMXR *mp)
{
SOCKET newsock;
TMLN *lp;