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tsrio.c
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/*
*
* Copyright (C) portshare Corporation, 1999-1999. All rights reserved.
*
*
* tsrio.c
* Tsrsock I/O Scheduler
*
* History
* 08/17/1999 V.1.0.0 Initial revision
*
* Oct-27-2001 V.1.0.1
* Read is now allowed when PTY is on WAITUSRWR* states
* Less syslog activity on unexpected events
* Hangup message is now of Warning type
*/
#include <sys/types.h>
#include <stdio.h>
#define _TSR_TSRIO_
#include "inc/portshare-ser-cli.h"
#include "inc/system.h"
#include "inc/tsrio.h"
#include "inc/telnet.h"
#include "inc/misc.h"
#include "inc/dev.h"
#include <string.h>
/*
* Internal Variables
*/
struct buffer Inbuf; /* Buffer RAS => USER */
struct buffer Outbuf; /* Buffer USER => RAS */
int Hang_up = FALSE;
struct statenames
{
const char *const stname;
char **subnames;
};
struct statenames Pty_states[] = {
{"PTY_INITIAL", 0},
{"PTY_CLOSING", 0},
{"PTY_CLOSED", 0},
{"PTY_OPENING", 0},
{"PTY_WAITDCD", 0},
{"PTY_OPER", 0},
{"PTY_CONFIG", 0},
{"PTY_WAITNVTWR", 0},
{"PTY_WAITUSRWR", 0},
{"PTY_WAITNRUW", 0},
{"PTY_WAITNVTCM", 0},
{"PTY_WAITCLOCAL", 0},
{"PTY_WAITCLOSE", 0},
{"PTY_OPERRONLY", 0},
{"PTY_WAITUSRWR0", 0},
{"PTY_WAITUSRWR2", 0},
};
struct statenames Nvt_states[] = {
{"NVT_INITIAL", 0},
{"NVT_OPER", 0},
{"NVT_WAITPTYWR", 0},
{"NVT_WAITRASWR", 0},
{"NVT_WAITRWPW", 0},
{"NVT_WAITRASCM", 0},
{"NVT_WAITRCPW", 0},
};
const char *const Pty_events[] = {
"EV_UPOPEN",
"EV_UPCLOSE",
"EV_UPDATA",
"EV_UPCONTROL",
"EV_UPFLUSH",
"EV_UPWROK",
};
const char *const Nvt_events[] = {
"EV_RNDNTFY",
"EV_RNDATA",
"EV_RNHANG",
"EV_RNCMOK",
"EV_RNWROK",
};
/*
* Main Scheduler Routines
*/
void all_hangup();
int check_states(void);
void all_wakeup(void);
void all_readonly(void);
/*
* PTY External events handlers (up_*)
*/
void up_nop(struct event *evp);
void up_open(struct event *unused);
void up_op01(struct event *unused);
void up_close(struct event *unused);
void up_data(struct event *evp);
void up_ioctl(struct event *unused);
void up_flush(struct event *evp);
void up_wrok(struct event *unused);
/*
* PTY Internal events handlers (np_*)
*/
void np_nop(const char *const hand);
void np_wrok(void);
void np_wok01(void);
void np_wok02(void);
void np_woker(void);
void np_cmdok(void);
void np_cok01(void);
void np_cok02(void);
void np_cok03(void);
void np_cok04(void);
void np_coker(void);
void np_dcdon(void);
void np_don01(void);
void np_don02(void);
void np_doner(void);
void np_dcdoff(void);
void np_dof01(void);
void np_dof02(void);
void np_dofer(void);
void np_parity(void);
void np_par01(void);
void np_parer(void);
void np_break(void);
void np_brk01(void);
void np_brker(void);
/*
* PTY Operations (do_pty*)
*/
void do_ptyerr(char *action);
int do_ptydata(void);
void do_ptyopen(void);
void do_ptyopen1(void);
void do_ptyclose(void);
void do_ptyclose1(void);
void do_ptywrite(void);
void do_ptyioctl(void);
void do_ptyconfig(int mode, struct portconfig *pcp);
void do_ptyconfig1(void);
void do_ptysendbreak(int interval);
void do_ptyflush(int mode);
void do_ptyhangup(void);
void do_ptyinterrupt(void);
/*
* NVT External events handlers (rn_*)
*/
void rn_nop(struct event *evp);
void rn_ntfy(struct event *evp);
void rn_data(struct event *unused);
void rn_cmdok(struct event *unused);
void rn_wrok(struct event *unused);
/*
* NVT Internal events handlers (pn_*)
*/
void pn_nop(const char *const hand);
void pn_wrok(void);
void pn_wok01(void);
void pn_wok02(void);
void pn_woker(void);
/*
* NVT Operations (do_nvt*)
*/
void do_nvterror(const char *const action);
int do_nvtdata(void);
void do_nvtdtron(void);
void do_nvtdtroff(void);
void do_nvtconfig(struct portconfig *pcp);
void do_nvtsendbreak(int interval);
void do_nvtflush(int mode);
/*
* Debug routines
*/
char *tsr_states(const char *const unused);
void print_ptystate(const char *const hand);
void print_nvtstate(const char *const hand);
void print_action(const char *const hand);
void print_event(struct event *evp);
/*
* Matrix for PTY External events
*/
void (*(Pty_upevents[PTY_STATES][EV_UPEVENTS])) (struct event * evp) = {
/*{UPOPEN ,UPCLOSE ,UPDATA ,UPCONTROL,UPFLUSH ,UPWROK } */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* INITIAL */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* CLOSING */
{
up_open, up_nop, up_nop, up_nop, up_nop, up_nop}, /* CLOSED */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* OPENING */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* WAITDCD */
{
up_nop, up_close, up_data, up_ioctl, up_flush, up_nop}, /* OPER */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* CONFIG */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* WAITNVTWR */
{
up_nop, up_close, up_data, up_nop, up_nop, up_wrok}, /* WAITUSRWR */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_wrok}, /* WAITNWUW */
{
up_nop, up_nop, up_nop, up_nop, up_nop, up_nop}, /* WAITNVTCM */
{
up_nop, up_close, up_nop, up_nop, up_nop, up_nop}, /* WAITCLOCAL */
{
up_nop, up_close, up_nop, up_nop, up_nop, up_nop}, /* WAITCLOSE */
{
up_op01, up_nop, up_nop, up_nop, up_nop, up_nop}, /* OPERRONLY */
{
up_nop, up_close, up_nop, up_nop, up_nop, up_wrok}, /* WAITUSRWR0 */
{
up_nop, up_close, up_nop, up_nop, up_nop, up_wrok}, /* WAITUSRWR2 */
};
/*
* Matrix for PTY Internal events
*/
void (*(Pty_npevents[PTY_STATES][EV_NPEVENTS])) (void) = {
/*{NPWROK ,NPCMDOK ,NPDCDON ,NPDCDOFF,NPPARITY,NPBREAK } */
{
np_woker, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* INITIAL */
{
np_woker, np_cok01, np_doner, np_dofer, np_parer, np_brker}, /* CLOSING */
{
np_woker, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* CLOSED */
{
np_woker, np_cok02, np_doner, np_dofer, np_parer, np_brker}, /* OPENING */
{
np_woker, np_coker, np_don01, np_dofer, np_parer, np_brker}, /* WAITDCD */
{
np_woker, np_coker, np_doner, np_dof01, np_par01, np_brk01}, /* OPER */
{
np_woker, np_cok03, np_doner, np_dofer, np_parer, np_brker}, /* CONFIG */
{
np_wok01, np_coker, np_doner, np_dofer, np_par01, np_brk01}, /* WAITNVTWR */
{
np_woker, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* WAITUSRWR */
{
np_wok02, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* WAITNWUW */
{
np_woker, np_cok04, np_doner, np_dofer, np_parer, np_brker}, /* WAITNVTCM */
{
np_woker, np_coker, np_don02, np_dofer, np_parer, np_brker}, /* WAITCLOCAL */
{
np_woker, np_coker, np_don01, np_dofer, np_parer, np_brker}, /* WAITCLOSE */
{
np_woker, np_coker, np_doner, np_dof02, np_parer, np_brk01}, /* OPERRONLY */
{
np_woker, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* WAITUSRWR0 */
{
np_woker, np_coker, np_doner, np_dofer, np_parer, np_brker}, /* WAITUSRWR2 */
};
/*
* Matrix for NVT External events
*/
void (*(Nvt_rnevents[NVT_STATES][EV_RNEVENTS])) (struct event * evp) = {
/*{RNNTFY ,RNDATA ,RNHANG ,RNCMDOK ,RNWROK } */
{
rn_ntfy, rn_nop, rn_nop, rn_nop, rn_nop}, /* INITIAL */
{
rn_ntfy, rn_data, rn_nop, rn_nop, rn_nop}, /* OPER */
{
rn_nop, rn_nop, rn_nop, rn_nop, rn_nop}, /* WAITPTYWR */
{
rn_ntfy, rn_data, rn_nop, rn_nop, rn_wrok}, /* WAITRASWR */
{
rn_nop, rn_nop, rn_nop, rn_nop, rn_wrok}, /* WAITRWPW */
{
rn_ntfy, rn_nop, rn_nop, rn_cmdok, rn_nop}, /* WAITRASCM */
{
rn_nop, rn_nop, rn_nop, rn_cmdok, rn_nop}, /* WAITRCPW */
};
/*
* Matrix for NVT Internal events
*/
void (*(Nvt_pnevents[NVT_STATES][EV_PNEVENTS])) (void) = {
/*{PNWROK } */
{
pn_woker}, /* INITIAL */
{
pn_woker}, /* OPER */
{
pn_wok01}, /* WAITPTYWR */
{
pn_woker}, /* WAITRASWR */
{
pn_wok02}, /* WAITRWPW */
{
pn_woker}, /* WAITRASCM */
{
pn_woker}, /* WAITRCPW */
};
/*
* Startup
*/
int
tsr_init(int netsize, int devsize, int devmodem, int closemode)
{
int ret;
/* Initialize buffers (warn: these macros can return) */
INIT_BUFFER(Inbuf, 2 * netsize);
INIT_BUFFER(Outbuf, 2 * devsize);
/* Initialize event queue */
INIT_EVENTS();
/* Connection status */
Hang_up = FALSE;
/* Initialize NVT */
if ((ret = tel_init(netsize, &Inbuf, &Outbuf)) != E_NORMAL)
return (ret);
NVT_SETSTATE("tsr_init", NVT_OPER); /* NVT starts at operational state */
/* Initialize PTY */
if ((ret = dev_init(devsize, devmodem, closemode, &Outbuf, &Inbuf,
Nvt.comport)) == E_NORMAL) {
PTY_SETSTATE("tsr_init", PTY_INITIAL);
do_ptyclose(); /* PTY starts at closed state */
}
return (ret);
}
/*
* Main Scheduler Routines
*/
void
tsr_io(void)
{
struct event *ev;
int mask;
while (Hang_up == FALSE) {
mask = check_states();
external_poll(mask, SCHED_DELAY);
while (Hang_up == FALSE) {
ev = GET_EVENT();
if (!ev)
break;
print_event(ev);
switch (ev->ev_type) {
case EV_UP:
(*Pty_upevents[Pty.state][ev->ev_code]) (ev);
break;
case EV_RN:
(*Nvt_rnevents[Nvt.state][ev->ev_code]) (ev);
break;
}
CLR_EVENT(ev);
}
}
all_hangup();
}
void
all_hangup()
{
dev_hangup();
tel_free();
dev_free();
FREE_BUFFER(Inbuf);
FREE_BUFFER(Outbuf);
FREE_EVENTS();
Hang_up = FALSE;
}
int
check_states(void)
{
int mask = 0;
switch (Pty.state) {
case PTY_OPER:
case PTY_OPERRONLY:
mask = DEV_READ | DEV_EXCEPT;
break;
case PTY_WAITCLOCAL:
case PTY_WAITCLOSE:
mask = DEV_PROBE | DEV_EXCEPT;
break;
case PTY_WAITUSRWR0:
mask = DEV_READ | DEV_EXCEPT | DEV_WRITE;
break;
case PTY_WAITUSRWR:
mask = DEV_READ | DEV_EXCEPT | DEV_WRITE;
break;
case PTY_WAITNWUW: /* don't read pty */
case PTY_WAITUSRWR2:
mask = DEV_WRITE;
break;
}
switch (Nvt.state) {
case NVT_OPER:
case NVT_WAITRASCM:
case NVT_WAITRCPW: /*WARN Pty Blocked, buffer may overrun */
mask |= SOCK_READ;
break;
case NVT_WAITRASWR:
mask |= SOCK_READ | SOCK_WRITE;
break;
case NVT_WAITRWPW: /* don't read socket */
mask |= SOCK_WRITE;
break;
}
return (mask);
}
void
imminent_event(int msgtype)
{
switch (Pty.state) {
case PTY_WAITCLOSE:
if (msgtype != PROBE_EOF) { /* ! MDATA == 0 =>any except CLOSE, BLOCK */
PTY_SETSTATE("probe", PTY_WAITDCD);
}
else {
dev_getdata(); /* CLOSE, GET IT */
}
break;
case PTY_WAITUSRWR0:
PTY_SETSTATE("probe", PTY_WAITUSRWR);
if (msgtype != PROBE_EOF && msgtype != PROBE_DATA) { /* ! MDATA, BLOCK */
PTY_SETSTATE("probe", PTY_WAITUSRWR2);
}
else { /* MDATA/CLOSE => GET IT */
dev_getdata();
}
break;
case PTY_WAITUSRWR:
if (msgtype != PROBE_EOF && msgtype != PROBE_DATA) { /* ! MDATA, BLOCK */
PTY_SETSTATE("probe", PTY_WAITUSRWR2);
}
else { /* MDATA/CLOSE => GET IT */
dev_getdata();
}
break;
case PTY_WAITCLOCAL:
if (msgtype == PROBE_CLOCAL) {
PTY_SETSTATE("probe", PTY_OPER);
Pty.portmodes |= PORT_CLOCAL;
dev_getdata();
}
else if (msgtype == PROBE_EOF) { /* CLOSE ?? */
PTY_SETSTATE("probe", PTY_OPER);
dev_getdata();
}
else {
PTY_SETSTATE("probe", PTY_WAITDCD);
}
break;
}
}
/* GAMB => Invoked in Pty.state == OPER, check for missed events */
void
all_wakeup(void)
{
/* First check for NP_DCDOFF */
if (!(Pty.portmodes & PORT_CLOCAL) &&
!(Pty.comport->portstate.modemstate & MODEM_DCD)) {
PTY_SETSTATE("all_wakeup", PTY_WAITCLOSE);
do_ptyhangup();
return;
}
/* Check for NVT data */
if (Pty.outbuff->b_hold) {
if (do_ptydata() != E_NORMAL) { /* local action */
return;
}
pn_wrok(); /* Notify NVT */
}
/* Finally, check for user data */
if (Pty.inbuff->b_hold) {
do_ptywrite();
}
}
void
all_readonly(void)
{
/* First check for NP_DCDOFF */
if (!(Pty.portmodes & PORT_CLOCAL) &&
!(Pty.comport->portstate.modemstate & MODEM_DCD)) {
PTY_SETSTATE("all_readonly", PTY_WAITCLOCAL);
do_ptyhangup();
return;
}
/* Check for NVT data */
if (Pty.outbuff->b_hold) {
if (do_ptydata() != E_NORMAL) { /* local action */
return;
}
pn_wrok(); /* Notify NVT */
}
}
/*
* PTY External events handlers (up_*)
*/
void
up_nop(struct event *evp)
{
const char *const event = Pty_events[evp->ev_code];
sysmessage(MSG_DEBUG, "PTY state (EVENT %s): %s\n", event,
tsr_states(event));
}
void
up_open(struct event *unused)
{
unused = unused;
do_ptyopen();
}
void
up_op01(struct event *unused)
{
unused = unused;
/* Port already open (read_only) => only change to read-write states */
switch (Pty.state) {
case PTY_OPERRONLY:
PTY_SETSTATE("up_op01", PTY_OPER);
all_wakeup(); /* XXXX */
break;
case PTY_WAITUSRWR0:
PTY_SETSTATE("up_op01", PTY_WAITUSRWR);
break;
}
}
void
up_close(struct event *unused)
{
unused = unused;
do_ptyclose();
}
void
up_ioctl(struct event *unused)
{
unused = unused;
do_ptyioctl();
}
void
up_flush(struct event *evp)
{
int mode = *(int *) evp->ev_param;
do_ptyflush(mode);
}
void
up_data(struct event *unused)
{
unused = unused;
do_ptywrite();
}
void
up_wrok(struct event *unused)
{
unused = unused;
switch (Pty.state) {
case PTY_WAITUSRWR0:
PTY_SETSTATE("up_wrok", PTY_OPERRONLY);
break;
case PTY_WAITUSRWR:
case PTY_WAITUSRWR2:
PTY_SETSTATE("up_wrok", PTY_OPER);
break;
case PTY_WAITNWUW:
PTY_SETSTATE("up_wrok", PTY_WAITNVTWR);
break;
}
if (do_ptydata() == E_NORMAL) { /* XXXX local action */
pn_wrok();
}
}
/*
* PTY Internal events handlers (np_*)
*/
void
np_nop(const char *const evhand)
{
sysmessage(MSG_DEBUG, "PTY state (INT EVENT %s): %s\n", evhand,
tsr_states(evhand));
}
/* EV_NPWROK */
void
np_wrok(void)
{
(*Pty_npevents[Pty.state][EV_NPWROK]) ();
}
void
np_wok01(void)
{
PTY_SETSTATE("np_wrok", PTY_OPER);
all_wakeup(); /* XXXX */
}
void
np_wok02(void)
{
PTY_SETSTATE("np_wrok", PTY_WAITUSRWR);
}
void
np_woker(void)
{
np_nop("np_wrok");
}
/* EV_NPCMDOK */
void
np_cmdok(void)
{
(*Pty_npevents[Pty.state][EV_NPCMDOK]) ();
}
void
np_cok01(void)
{
do_ptyclose1();
}
void
np_cok02(void)
{
do_ptyopen1();
}
void
np_cok03(void)
{
do_ptyconfig1();
}
void
np_cok04(void)
{
PTY_SETSTATE("np_cmdok", PTY_OPER);
all_wakeup(); /* XXXX */
}
void
np_coker(void)
{
np_nop("np_cmdok");
}
/* EV_NPDCDON */
void
np_dcdon(void)
{
(*Pty_npevents[Pty.state][EV_NPDCDON]) ();
}
void
np_don01(void)
{
PTY_SETSTATE("np_dcdon", PTY_OPER);
all_wakeup(); /* XXXX */
}
void
np_don02(void)
{
PTY_SETSTATE("np_dcdon", PTY_OPERRONLY);
all_readonly();
}
void
np_doner(void)
{
np_nop("ev_npdcdon");
}
/* EV_NPDCDOFF */
void
np_dcdoff(void)
{
(*Pty_npevents[Pty.state][EV_NPDCDOFF]) ();
}
void
np_dof01(void)
{
if (!(Pty.portmodes & PORT_CLOCAL)) {
PTY_SETSTATE("np_dcdoff", PTY_WAITCLOSE);
do_ptyhangup();
}
}
void
np_dof02(void)
{
if (!(Pty.portmodes & PORT_CLOCAL)) {
PTY_SETSTATE("np_dcdoff", PTY_WAITCLOCAL);
do_ptyhangup();
}
}
void
np_dofer(void)
{
np_nop("np_dcdoff");
}
/* EV_NPPARITY */
void
np_parity(void)
{
(*Pty_npevents[Pty.state][EV_NPPARITY]) ();
}
void
np_par01(void)
{
int portmodes;
struct buffer *bp;
portmodes = Pty.portmodes;
bp = Pty.outbuff;
if (!(portmodes & PORT_IGNPAR)) {
if (portmodes & PORT_PARMRK) {
PUT_BUFFER(bp, 0xff);
PUT_BUFFER(bp, 0x00);
}
else {
PUT_BUFFER(bp, 0x00);
}
}
}
void
np_parer(void)
{
np_nop("np_parity");
}
/* EV_NPBREAK */
void
np_break(void)
{
(*Pty_npevents[Pty.state][EV_NPBREAK]) ();
}
void
np_brk01(void)
{
int portmodes;
struct buffer *bp1, *bp2;
portmodes = Pty.portmodes;
bp1 = Pty.outbuff;
bp2 = Pty.inbuff;
if (!(portmodes & PORT_IGNBRK)) {
if (portmodes & PORT_BRKINT) {
RESET_BUFFER(bp1);
RESET_BUFFER(bp2);
do_ptyinterrupt();
}
else if (portmodes & PORT_PARMRK) {
PUT_BUFFER(bp1, 0xff);
PUT_BUFFER(bp1, 0x00);
}
else {
PUT_BUFFER(bp1, 0x00);
}
}
}
void
np_brker(void)
{
np_nop("np_break");
}
/*
* PTY Operations (do_pty*)
*/
void
do_ptyerror(const char *const action)
{
sysmessage(MSG_ERR, "Undesirable PTY state for ACTION %s: %s\n",
action, tsr_states(action));
}
int
do_ptydata()
{
int ret;
struct buffer *bp = Pty.outbuff;
print_action("do_ptydata");
switch (Pty.state) {
case PTY_OPER:
case PTY_OPERRONLY:
case PTY_WAITNVTWR:
if ((ret = dev_putdata(bp)) == 0) {
if (bp->b_hold != 0) {
switch (Pty.state) {
case PTY_OPER:
PTY_SETSTATE("do_ptydata", PTY_WAITUSRWR);
break;
case PTY_WAITNVTWR:
PTY_SETSTATE("do_ptydata", PTY_WAITNWUW);
break;
case PTY_OPERRONLY:
PTY_SETSTATE("do_ptydata", PTY_WAITUSRWR0);
break;
}
ret = E_BLOCKED;
}
else {
ret = E_NORMAL;
}
}
else {
Hang_up = TRUE;
if (Debug > 0) {
sysmessage(MSG_DEBUG, "HANGUP DO_PTYDATA\n");
}
ret = E_FILEIO;
}
break;
case PTY_WAITCLOSE:
case PTY_CLOSING:
case PTY_CLOSED:
case PTY_OPENING:
case PTY_WAITCLOCAL:
case PTY_WAITDCD:
RESET_BUFFER(Pty.outbuff); /* Discard it */
pn_wrok(); /* Notify NVT */
ret = E_NORMAL;
break;
default:
do_ptyerror("do_ptydata");
ret = E_BLOCKED; /* Transition to PTY_OPER must wakeup NVT */
break;
}
return (ret);
}
void
do_ptyclose(void)
{
print_action("do_ptyclose");
/* Wait output data to drain */
if (Pty.inbuff->b_hold) {
if (do_nvtdata() != E_NORMAL) {
sysmessage(MSG_WARNING,
"Can't flush output buffer before close\n");
}
}
/* Flush input data */
if (Pty.outbuff->b_hold) {
RESET_BUFFER(Pty.outbuff);
pn_wrok(); /* Notify NVT */
}
/* Set DTR off if applicable */
if (Pty.portmodes & PORT_HUPCL) {
PTY_SETSTATE("do_ptyclose", PTY_CLOSING);
do_nvtdtroff(); /* Sched */
}
else {
do_ptyclose1();
}
}
void
do_ptyclose1(void)
{
print_action("do_ptyclose1");
dev_config();
PTY_SETSTATE("do_ptyclose1", PTY_CLOSED);
/* Simulate a user open */
/* DO a DTR OFF->ON delay */
sysdelay(1000);
do_ptyopen();
}
void
do_ptyopen(void)
{
print_action("do_ptyopen");
PTY_SETSTATE("do_ptyopen", PTY_OPENING);
Pty.comport->portstate.modemstate |= MODEM_RTS;