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irix-657m-src/eoe/cmd/bsd/telnetd/telnetd.c
calmsacibis995 8fc8fa8089 Source code upload
2022-09-29 17:59:04 +03:00

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/*
* Copyright (c) 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms are permitted provided
* that: (1) source distributions retain this entire copyright notice and
* comment, and (2) distributions including binaries display the following
* acknowledgement: ``This product includes software developed by the
* University of California, Berkeley and its contributors'' in the
* documentation or other materials provided with the distribution and in
* all advertising materials mentioning features or use of this software.
* Neither the name of the University nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
* THIS SOFTWARE IS PROVIDED ``AS IS'' AND WITHOUT ANY EXPRESS OR IMPLIED
* WARRANTIES, INCLUDING, WITHOUT LIMITATION, THE IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1989 Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
static char sccsid[] = "@(#)telnetd.c 5.47 (Berkeley) 9/14/90";
#endif /* not lint */
#include "telnetd.h"
#include "pathnames.h"
#if defined(sgi) && defined(TSD)
#include "sys/stropts.h"
#include "sys/mkdev.h"
#include "sys/tsd.h"
#include "sys/major.h"
#include "stdlib.h"
#endif
/*
* I/O data buffers,
* pointers, and counters.
*/
char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
char ptyibuf2[BUFSIZ];
int hostinfo = 1; /* do we print login banner? */
#ifdef sgi
int keepalive = 1;
#define BANNER "\r\n\r\nIRIX (%s)\r\n\r\r\n\r"
#endif
int debug = 0;
char *progname;
#ifdef NEED_GETTOS
struct tosent {
char *t_name; /* name */
char **t_aliases; /* alias list */
char *t_proto; /* protocol */
int t_tos; /* Type Of Service bits */
};
struct tosent *
gettosbyname(name, proto)
char *name, *proto;
{
static struct tosent te;
static char *aliasp = 0;
te.t_name = name;
te.t_aliases = &aliasp;
te.t_proto = proto;
te.t_tos = 020; /* Low Delay bit */
return(&te);
}
#endif
main(argc, argv)
char *argv[];
{
struct sockaddr_in from;
int on = 1, fromlen;
#if defined(HAS_IP_TOS) || defined(NEED_GETTOS)
struct tosent *tp;
#endif /* defined(HAS_IP_TOS) || defined(NEED_GETTOS) */
pfrontp = pbackp = ptyobuf;
netip = netibuf;
nfrontp = nbackp = netobuf;
progname = *argv;
top:
argc--, argv++;
if (argc > 0 && strcmp(*argv, "-debug") == 0) {
debug++;
goto top;
}
#ifdef LINEMODE
if (argc > 0 && !strcmp(*argv, "-l")) {
alwayslinemode = 1;
goto top;
}
#endif /* LINEMODE */
if (argc > 0 && !strcmp(*argv, "-h")) {
hostinfo = 0;
goto top;
}
#ifdef sgi
if (argc > 0 && !strcmp(*argv, "-n")) {
keepalive = 0;
goto top;
}
#endif
#ifdef DIAGNOSTICS
/*
* Check for desired diagnostics capabilities.
*/
if (argc > 0 && !strncmp(*argv, "-D", 2)) {
*argv += 2;
if (**argv == '\0') {
if (argc < 2) {
usage();
/* NOT REACHED */
}
argv++, argc--;
if (**argv == '\0') {
usage();
/* NOT REACHED */
}
}
if (!strcmp(*argv, "report")) {
diagnostic |= TD_REPORT|TD_OPTIONS;
} else if (!strcmp(*argv, "exercise")) {
diagnostic |= TD_EXERCISE;
} else if (!strcmp(*argv, "netdata")) {
diagnostic |= TD_NETDATA;
} else if (!strcmp(*argv, "ptydata")) {
diagnostic |= TD_PTYDATA;
} else if (!strcmp(*argv, "options")) {
diagnostic |= TD_OPTIONS;
} else {
usage();
/* NOT REACHED */
}
goto top;
}
#endif /* DIAGNOSTICS */
#ifdef BFTPDAEMON
/*
* Check for bftp daemon
*/
if (argc > 0 && !strncmp(*argv, "-B", 2)) {
bftpd++;
goto top;
}
#endif /* BFTPDAEMON */
if (argc > 0 && **argv == '-') {
fprintf(stderr, "telnetd: %s: unknown option\n", *argv+1);
usage();
/* NOT REACHED */
}
if (debug) {
int s, ns, foo;
struct servent *sp;
static struct sockaddr_in sin = { AF_INET };
if (argc > 1) {
usage();
/* NOT REACHED */
} else if (argc == 1) {
if (sp = getservbyname(*argv, "tcp")) {
sin.sin_port = sp->s_port;
} else {
sin.sin_port = atoi(*argv);
if ((int)sin.sin_port <= 0) {
fprintf(stderr, "telnetd: %s: bad port #\n", *argv);
usage();
/* NOT REACHED */
}
sin.sin_port = htons((u_short)sin.sin_port);
}
} else {
sp = getservbyname("telnet", "tcp");
if (sp == 0) {
fprintf(stderr, "telnetd: tcp/telnet: unknown service\n");
exit(1);
}
sin.sin_port = sp->s_port;
}
s = socket(AF_INET, SOCK_STREAM, 0);
if (s < 0) {
perror("telnetd: socket");;
exit(1);
}
(void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) {
perror("bind");
exit(1);
}
if (listen(s, 1) < 0) {
perror("listen");
exit(1);
}
foo = sizeof sin;
ns = accept(s, (struct sockaddr *)&sin, &foo);
if (ns < 0) {
perror("accept");
exit(1);
}
(void) dup2(ns, 0);
(void) close(ns);
(void) close(s);
} else if (argc > 0) {
usage();
/* NOT REACHED */
}
openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
fromlen = sizeof (from);
if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
fprintf(stderr, "%s: ", progname);
perror("getpeername");
_exit(1);
}
#ifdef sgi
if (keepalive &&
setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) {
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
}
#else
if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) {
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
}
#endif
#if defined(HAS_IP_TOS) || defined(NEED_GETTOS)
if ((tp = gettosbyname("telnet", "tcp")) &&
(setsockopt(0, IPPROTO_IP, IP_TOS, &tp->t_tos, sizeof(int)) < 0))
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
#endif /* defined(HAS_IP_TOS) || defined(NEED_GETTOS) */
net = 0;
#if defined(sgi) && defined (TSD)
doit_streams(&from);
#else
doit(&from);
#endif /* defined(sgi) && defined (TSD) */
/* NOTREACHED */
} /* end of main */
usage()
{
fprintf(stderr, "Usage: telnetd [-debug] [-h]");
#ifdef DIAGNOSTICS
fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]");
#endif /* DIAGNOSTICS */
#ifdef LINEMODE
fprintf(stderr, " [-l]");
#endif
#ifdef BFTPDAEMON
fprintf(stderr, " [-B]");
#endif /* BFTPDAEMON */
fprintf(stderr, " [port]\n");
exit(1);
}
#ifdef _IRIX4
int cleanup();
#else
void cleanup();
#endif
/*
* getterminaltype
*
* Ask the other end to send along its terminal type and speed.
* Output is the variable terminaltype filled in.
*/
static char ttytype_sbbuf[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE };
void
getterminaltype()
{
void ttloop();
settimer(baseline);
send_do(TELOPT_TTYPE, 1);
send_do(TELOPT_TSPEED, 1);
send_do(TELOPT_XDISPLOC, 1);
send_do(TELOPT_ENVIRON, 1);
while (his_will_wont_is_changing(TELOPT_TTYPE) ||
his_will_wont_is_changing(TELOPT_TSPEED) ||
his_will_wont_is_changing(TELOPT_XDISPLOC) ||
his_will_wont_is_changing(TELOPT_ENVIRON)) {
ttloop();
}
if (his_state_is_will(TELOPT_TSPEED)) {
static char sbbuf[] = { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
bcopy(sbbuf, nfrontp, sizeof sbbuf);
nfrontp += sizeof sbbuf;
}
if (his_state_is_will(TELOPT_XDISPLOC)) {
static char sbbuf[] = { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE };
bcopy(sbbuf, nfrontp, sizeof sbbuf);
nfrontp += sizeof sbbuf;
}
if (his_state_is_will(TELOPT_ENVIRON)) {
static char sbbuf[] = { IAC, SB, TELOPT_ENVIRON, TELQUAL_SEND, IAC, SE };
bcopy(sbbuf, nfrontp, sizeof sbbuf);
nfrontp += sizeof sbbuf;
}
if (his_state_is_will(TELOPT_TTYPE)) {
bcopy(ttytype_sbbuf, nfrontp, sizeof ttytype_sbbuf);
nfrontp += sizeof ttytype_sbbuf;
}
if (his_state_is_will(TELOPT_TSPEED)) {
while (sequenceIs(tspeedsubopt, baseline))
ttloop();
}
if (his_state_is_will(TELOPT_XDISPLOC)) {
while (sequenceIs(xdisplocsubopt, baseline))
ttloop();
}
if (his_state_is_will(TELOPT_ENVIRON)) {
while (sequenceIs(environsubopt, baseline))
ttloop();
}
if (his_state_is_will(TELOPT_TTYPE)) {
char first[256], last[256];
while (sequenceIs(ttypesubopt, baseline))
ttloop();
/*
* If the other side has already disabled the option, then
* we have to just go with what we (might) have already gotten.
*/
if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
(void) strncpy(first, terminaltype, sizeof(first));
for(;;) {
/*
* Save the unknown name, and request the next name.
*/
(void) strncpy(last, terminaltype, sizeof(last));
_gettermname();
if (terminaltypeok(terminaltype))
break;
if ((strncmp(last, terminaltype, sizeof(last)) == 0) ||
his_state_is_wont(TELOPT_TTYPE)) {
/*
* We've hit the end. If this is the same as
* the first name, just go with it.
*/
if (strncmp(first, terminaltype, sizeof(first)) == 0)
break;
/*
* Get the terminal name one more time, so that
* RFC1091 compliant telnets will cycle back to
* the start of the list.
*/
_gettermname();
if (strncmp(first, terminaltype, sizeof(first)) != 0)
(void) strncpy(terminaltype, first, sizeof(first));
break;
}
}
}
}
} /* end of getterminaltype */
_gettermname()
{
#ifdef sgi
extern void ttloop();
#endif
/*
* If the client turned off the option,
* we can't send another request, so we
* just return.
*/
if (his_state_is_wont(TELOPT_TTYPE))
return;
settimer(baseline);
bcopy(ttytype_sbbuf, nfrontp, sizeof ttytype_sbbuf);
nfrontp += sizeof ttytype_sbbuf;
while (sequenceIs(ttypesubopt, baseline))
ttloop();
}
terminaltypeok(s)
char *s;
{
char buf[1024];
if (terminaltype == NULL)
return(1);
/*
* tgetent() will return 1 if the type is known, and
* 0 if it is not known. If it returns -1, it couldn't
* open the database. But if we can't open the database,
* it won't help to say we failed, because we won't be
* able to verify anything else. So, we treat -1 like 1.
*/
if (tgetent(buf, s) == 0)
return(0);
return(1);
}
#if defined(sgi) && defined(TSD)
#define TSD_MAX_NAME 24 /* maximum length of device name */
static void
tsdMakeDeviceName(char *n, minor_t m)
{
sprintf(n, "/dev/tty%c%3.3x", 'g' + (m >> 12), m & 0xfff);
}
static void
tsdExitMonitor(tfd)
/*
* Fork a process to wait for exitting telnet connections.
*/
{
char tsd_name[TSD_MAX_NAME];
int fd;
struct strioctl s;
minor_t m;
tsdMakeDeviceName(tsd_name, 0);
if ((0 > mknod(tsd_name, S_IFCHR+0600, makedev(TSD_MAJOR, 0)))
&& (EEXIST != errno)) {
return;
}
if (0 > (fd = open(tsd_name, O_RDWR))) {
return;
}
/*
* Check if we are only one monitoring.
*/
if (0 > ioctl(fd, TIOCEXCL, 0)) {
return;
}
/*
* Ok, it is up to use to monitor.
*/
switch(fork()) {
case 0: /* child */
/*
* Close all other fds.
*/
if (fd != 0) {
close(0);
}
if (fd != 1) {
close(1);
}
if (fd != 2) {
close(2);
}
close(tfd);
/*
* Loop waiting for telnet connections to exit.
*/
while (sizeof(minor_t) == read(fd, &m, sizeof(m))) {
tsdMakeDeviceName(tsd_name, m);
line = tsd_name;
rmut();
}
exit(0);
case -1:
syslog(LOG_INFO, "tsdExitMonitor: fork: %m\n");
break;
default: /* parent */
close(fd);
break;
}
}
/*
* Attempt to use the kernel streams telnetd. If it fails, well,
* take the normal approach.
*/
static struct termio cooked = {
BRKINT+IGNPAR+ISTRIP+ICRNL+IXON, /* iflags */
OPOST+ONLCR+TAB3, /* oflags */
#ifdef sgi
CS8+CREAD+CLOCAL, /* cflags */
#else
B38400+CS8+CREAD+CLOCAL, /* cflags */
#endif
ISIG+ICANON+ECHOK, /* lflags */
#ifdef sgi
B38400, /* ospeed */
0, /* ispeed */
#endif
LDISC0, /* line discipline */
{
CINTR,CQUIT,CERASE,CKILL, /* INTR, QUIT, ERASE, KILL */
CEOF,CNUL,CNUL,CNUL, /* EOF, EOL, EOL2, VSWTCH */
CSTART, CSTOP, CNUL, CNUL, /* START, STOP, SUSP, DSUSP */
CRPRNT, CFLUSH, CWERASE, CLNEXT, /* RPRNT, FLUSH, WERASE, LNEXT */
CDEL, CDEL, CDEL, CDEL, /* STATUS, SAVED_EOF, SAVED_EOL, ? */
CDEL, CDEL, CDEL /* ?, ?, ? */
}
};
int
doit_streams(struct sockaddr_in *who)
{
# define STREAM_DEVICE "/dev/tnclone"
extern struct hostent * __getverfhostent(struct in_addr, int);
static char tsd_device[24], *t;
int fd, tfd, selrv;
struct strioctl s;
struct tcssocket_info tsi;
struct stat sb;
extern telnet_requests(void);
extern void ttloop();
extern void netflush();
struct winsize ws;
fd_set netfds;
struct timeval fls_timeout;
/* release previous controlling tty */
#ifdef TIOCNOTTY
fd = open("/dev/tty", O_RDWR);
if (fd >= 0) {
(void)ioctl(fd, TIOCNOTTY, 0);
close(fd);
}
#endif
/*
* Try to use a stream device, if it works, then were off to
* the races, otherwise we just use the normal method.
*/
fd = open(STREAM_DEVICE, O_RDWR);
if (0 > fd) {
return(doit(who));
}
/*
* Ok - we now have "fd" as a stream telnetd device. We must open the
* real device in a non-clone manner to help replace our controlling
* tty. If we do not do this step, "ttyname" routines will not
* be able to locate our tty.
*
* Also, to keep things in adut working, we must leave the extern
* variable "line" with the device in it.
*/
if (0 > fstat(fd, &sb)) {
fatalperror(net, "fstat tsd");
}
if (minor(sb.st_dev) >= (('k' - 'g' + 1) * 0x1000)) {
/*
* Too many streams devices around, time to revert to old ways.
*/
close(fd);
return(doit(who));
}
tsdMakeDeviceName(tsd_device, minor(sb.st_rdev));
line = tsd_device;
if ((0 > mknod(tsd_device, S_IFCHR+0666, sb.st_rdev))
&& (EEXIST != errno)) {
close(fd);
return(doit(who));
}
tfd = open(tsd_device, O_RDWR);
(void)close(fd);
if (0 > tfd) {
return(doit(who));
}
fd = tfd;
/*
* Tricky, but here we set the ptr variable, which is supposed to
* be the fd of the pty to the socket. This allows the ioctls,
* such as SWINSZ to be directed to the socket.
*/
pty = fd;
/*
* Spawn the "exit" process if this is the first telnetd.
*/
tsdExitMonitor(tfd);
/*
* Do normal stuff like get terminal name etc.
*/
init_env();
getterminaltype();
setenv("TERM", terminaltype ? terminaltype : "network", 1);
/*
* Fire off any requests that we have.
*/
telnet_requests();
/*
* Clear out anything in the buffers we have before the driver
* takes over. There might be something in there that would be lost
* forever - pure badness!
* BUT ... do this only if there is actually anything there, or
* ttloop() will hang on a read. Bad news if client is also
* waiting in a read.
*/
/* Clear outgoing buffer */
if (nfrontp - nbackp) {
netflush();
}
FD_ZERO(&netfds);
FD_SET(net, &netfds);
fls_timeout.tv_sec = 1;
if (1 == (selrv = select(net+1, &netfds, 0, 0, &fls_timeout))) {
/* There really is something there */
ttloop();
} else if (-1 == selrv) {
syslog(LOG_INFO, "doit_streams: select: %m\n");
exit(1);
}
telrcv();
tsi.tsi_fd = 0;
/*
* Cool - now push the stty_ld module to do the terminal stuff
* for us on top. This must be done BEFORE the socket is associated
* with the connection to allow any of the IOCTL's that may
* come "up stream" with any remote crap still comming in to
* in the stty_ld module.
*/
if (0 > ioctl(fd, I_PUSH, "stty_ld")) {
close(fd);
return(doit(who));
}
/*
* Set up initial termio in the stty_ld and tsd. If we are supposed to
* be echoing, then turn on echo.
*/
if (my_state_is_will(TELOPT_ECHO)) {
cooked.c_lflag |= ECHO;
}
if (0 > ioctl(fd, TCSETA, &cooked)) {
fatalperror("ioctl TCSETA");
}
/* Try to look up terminal name */
t = getenv("TERM"); /* terminal name? */
if (NULL == t) {
t = "unknown";
}
strncpy(tsi.tsi_name, t, sizeof(tsi.tsi_name) - 1);
tsi.tsi_name[sizeof(tsi.tsi_name) - 1] = '\0';
s.ic_cmd= TCSSOCKET;
s.ic_dp = (void *)&tsi;
s.ic_len= sizeof(tsi);
bcopy(options, &tsi.tsi_options, sizeof(tsi.tsi_options));
bcopy(do_dont_resp, &tsi.tsi_doDontResp, sizeof(tsi.tsi_doDontResp));
bcopy(will_wont_resp, &tsi.tsi_willWontResp,
sizeof(tsi.tsi_willWontResp));
if (0 > ioctl(fd, I_STR, &s)) { /* stdin is out socket right now */
close(fd);
return(doit(who));
}
/*
* Make streams terminal the controlling terminal now ....
*/
if (0 > setsid()) {
fatalperror(net, "setsid()");
}
if (0 > setpgrp()) {
fatalperror(net, "setpgrp()");
}
/*
* Send down the banner stuff now that the stream is all
* set up and operational.
*/
if (hostinfo) {
char banner[256];
char hostname[MAXHOSTNAMELEN];
(void)gethostname(hostname, sizeof(hostname));
sprintf(banner, BANNER, hostname);
(void)write(0, banner, strlen(banner));
}
if (-1 == login_tty(fd)) {
fatalperror(net, "login_tty(tsd)");
}
start_login((__getverfhostent(who->sin_addr, 1))->h_name);
}
#endif /* defined(sgi) && defined(TSD) */
/*
* Get a pty, scan input lines.
*/
doit(who)
struct sockaddr_in *who;
{
char *host, *inet_ntoa();
int t;
#ifdef sgi
int on = 1;
extern struct hostent * __getverfhostent(struct in_addr, int);
#else
struct hostent *hp;
#endif
/*
* Find an available pty to use.
*/
pty = getpty();
if (pty < 0)
fatalperror(net, "All network ports in use");
#ifdef sgi
/* Turn on packet mode before the other process has a chance
* do any output.
*/
(void) ioctl(pty, TIOCPKT, (char *)&on);
host = __getverfhostent(who->sin_addr, 1)->h_name;
#else
/* get name of connected client */
hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr),
who->sin_family);
if (hp)
host = hp->h_name;
else
host = inet_ntoa(who->sin_addr);
#endif /* sgi */
init_env();
/*
* get terminal type.
*/
getterminaltype();
setenv("TERM", terminaltype ? terminaltype : "network", 1);
/*
* Start up the login process on the slave side of the terminal
*/
startslave(host);
telnet(net, pty); /* begin server processing */
/*NOTREACHED*/
} /* end of doit */
/*
* Send out requests for telnet configuration.
*/
telnet_requests()
{
#ifdef sgi
extern void ttloop();
#endif
/*
* Do some tests where it is desireable to wait for a response.
* Rather than doing them slowly, one at a time, do them all
* at once.
*/
if (my_state_is_wont(TELOPT_SGA))
send_will(TELOPT_SGA, 1);
/*
* Is the client side a 4.2 (NOT 4.3) system? We need to know this
* because 4.2 clients are unable to deal with TCP urgent data.
*
* To find out, we send out a "DO ECHO". If the remote system
* answers "WILL ECHO" it is probably a 4.2 client, and we note
* that fact ("WILL ECHO" ==> that the client will echo what
* WE, the server, sends it; it does NOT mean that the client will
* echo the terminal input).
*/
send_do(TELOPT_ECHO, 1);
#ifdef LINEMODE
if (his_state_is_wont(TELOPT_LINEMODE)) {
/* Query the peer for linemode support by trying to negotiate
* the linemode option.
*/
linemode = 0;
editmode = 0;
send_do(TELOPT_LINEMODE, 1); /* send do linemode */
}
#endif /* LINEMODE */
/*
* Send along a couple of other options that we wish to negotiate.
p */
send_do(TELOPT_NAWS, 1);
send_will(TELOPT_STATUS, 1);
flowmode = 1; /* default flow control state */
send_do(TELOPT_LFLOW, 1);
/*
* Spin, waiting for a response from the DO ECHO. However,
* some REALLY DUMB telnets out there might not respond
* to the DO ECHO. So, we spin looking for NAWS, (most dumb
* telnets so far seem to respond with WONT for a DO that
* they don't understand...) because by the time we get the
* response, it will already have processed the DO ECHO.
* Kludge upon kludge.
*/
while (his_will_wont_is_changing(TELOPT_NAWS))
ttloop();
/*
* But...
* The client might have sent a WILL NAWS as part of its
* startup code; if so, we'll be here before we get the
* response to the DO ECHO. We'll make the assumption
* that any implementation that understands about NAWS
* is a modern enough implementation that it will respond
* to our DO ECHO request; hence we'll do another spin
* waiting for the ECHO option to settle down, which is
* what we wanted to do in the first place...
*/
if (his_want_state_is_will(TELOPT_ECHO) &&
his_state_is_will(TELOPT_NAWS)) {
while (his_will_wont_is_changing(TELOPT_ECHO))
ttloop();
}
/*
* On the off chance that the telnet client is broken and does not
* respond to the DO ECHO we sent, (after all, we did send the
* DO NAWS negotiation after the DO ECHO, and we won't get here
* until a response to the DO NAWS comes back) simulate the
* receipt of a will echo. This will also send a WONT ECHO
* to the client, since we assume that the client failed to
* respond because it believes that it is already in DO ECHO
* mode, which we do not want.
*/
if (his_want_state_is_will(TELOPT_ECHO)) {
#ifdef DIAGNOSTICS
if (diagnostic & TD_OPTIONS) {
sprintf(nfrontp, "td: simulating recv\r\n");
nfrontp += strlen(nfrontp);
}
#endif /* DIAGNOSTICS */
willoption(TELOPT_ECHO);
}
/*
* Finally, to clean things up, we turn on our echo. This
* will break stupid 4.2 telnets out of local terminal echo.
*/
/* if (my_state_is_wont(TELOPT_ECHO)) */
send_will(TELOPT_ECHO, 1);
}
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif /* MAXHOSTNAMELEN */
/*
* Main loop. Select from pty and network, and
* hand data to telnet receiver finite state machine.
*/
telnet(f, p)
int f, p;
{
int on = 1;
char hostname[MAXHOSTNAMELEN];
#define TABBUFSIZ 512
char defent[TABBUFSIZ];
char defstrs[TABBUFSIZ];
#undef TABBUFSIZ
char *HE;
char *HN;
char *IM;
void netflush();
#ifdef sgi
extern void ttloop();
#endif
/*
* Initialize the slc mapping table.
*/
get_slc_defaults();
#ifdef sgi
/*
* Our initial setup stuff.
*/
telnet_requests();
/*
* this is too late to turn on packet mode. Login may have
* already started asking "login:". If you delay setting
* packet mode until here, then the first buffer received
* from the pty will not have a leading packet byte. The "l"
* will be interpreted as the packet byte.
*/
#else
/*
* Turn on packet mode
*/
(void) ioctl(p, TIOCPKT, (char *)&on);
#endif /* sgi */
#ifdef KLUDGELINEMODE
/*
* Continuing line mode support. If client does not support
* real linemode, attempt to negotiate kludge linemode by sending
* the do timing mark sequence.
*/
if (lmodetype < REAL_LINEMODE)
send_do(TELOPT_TM, 1);
#endif /* KLUDGELINEMODE */
/*
* Call telrcv() once to pick up anything received during
* terminal type negotiation, 4.2/4.3 determination, and
* linemode negotiation.
*/
telrcv();
(void) ioctl(f, FIONBIO, (char *)&on);
(void) ioctl(p, FIONBIO, (char *)&on);
#ifdef SO_OOBINLINE
(void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on);
#endif /* defined(SO_OOBINLINE) */
#ifdef SIGTSTP
(void) signal(SIGTSTP, SIG_IGN);
#endif
#ifdef SIGTTOU
/*
* Ignoring SIGTTOU keeps the kernel from blocking us
* in ttioct() in /sys/tty.c.
*/
(void) signal(SIGTTOU, SIG_IGN);
#endif
(void) signal(SIGCHLD, cleanup);
#ifdef TIOCNOTTY
{
register int t;
t = open(_PATH_TTY, O_RDWR);
if (t >= 0) {
(void) ioctl(t, TIOCNOTTY, (char *)0);
(void) close(t);
}
}
#endif
/*
* Show banner that getty never gave.
*
* We put the banner in the pty input buffer. This way, it
* gets carriage return null processing, etc., just like all
* other pty --> client data.
*/
#ifdef sgi
if (telnet_getenv("USER"))
#else
if (getenv("USER"))
#endif
hostinfo = 0;
(void) gethostname(hostname, sizeof (hostname));
#ifdef sgi
/* Show banner if not doing automatic login. */
if (hostinfo)
(void) sprintf(ptyibuf2, BANNER, hostname);
#else
if (getent(defent, "default") == 1) {
char *getstr();
char *cp=defstrs;
#ifdef sgi
HE = HN = IM = 0;
#else
HE = getstr("he", &cp);
HN = getstr("hn", &cp);
IM = getstr("im", &cp);
#endif
if (HN && *HN)
(void) strcpy(hostname, HN);
if (IM == 0)
IM = "";
} else {
IM = DEFAULT_IM;
HE = 0;
}
edithost(HE, hostname);
if (hostinfo && *IM)
putf(IM, ptyibuf2);
#endif /* sgi */
if (pcc)
(void) strncat(ptyibuf2, ptyip, pcc+1);
ptyip = ptyibuf2;
pcc = strlen(ptyip);
#ifdef LINEMODE
/*
* Last check to make sure all our states are correct.
*/
init_termbuf();
localstat();
#endif /* LINEMODE */
#ifdef DIAGNOSTICS
if (diagnostic & TD_REPORT) {
sprintf(nfrontp, "td: Entering processing loop\r\n");
nfrontp += strlen(nfrontp);
}
#endif /* DIAGNOSTICS */
for (;;) {
fd_set ibits, obits, xbits;
register int c;
if (ncc < 0 && pcc < 0)
break;
FD_ZERO(&ibits);
FD_ZERO(&obits);
FD_ZERO(&xbits);
/*
* Never look for input if there's still
* stuff in the corresponding output buffer
*/
if (nfrontp - nbackp || pcc > 0) {
FD_SET(f, &obits);
} else {
FD_SET(p, &ibits);
}
if (pfrontp - pbackp || ncc > 0) {
FD_SET(p, &obits);
} else {
FD_SET(f, &ibits);
}
if (!SYNCHing) {
FD_SET(f, &xbits);
}
if ((c = select(16, &ibits, &obits, &xbits,
(struct timeval *)0)) < 1) {
if (c == -1) {
if (errno == EINTR) {
continue;
}
}
sleep(5);
continue;
}
/*
* Any urgent data?
*/
if (FD_ISSET(net, &xbits)) {
SYNCHing = 1;
}
/*
* Something to read from the network...
*/
if (FD_ISSET(net, &ibits)) {
#ifndef SO_OOBINLINE
/*
* In 4.2 (and 4.3 beta) systems, the
* OOB indication and data handling in the kernel
* is such that if two separate TCP Urgent requests
* come in, one byte of TCP data will be overlaid.
* This is fatal for Telnet, but we try to live
* with it.
*
* In addition, in 4.2 (and...), a special protocol
* is needed to pick up the TCP Urgent data in
* the correct sequence.
*
* What we do is: if we think we are in urgent
* mode, we look to see if we are "at the mark".
* If we are, we do an OOB receive. If we run
* this twice, we will do the OOB receive twice,
* but the second will fail, since the second
* time we were "at the mark", but there wasn't
* any data there (the kernel doesn't reset
* "at the mark" until we do a normal read).
* Once we've read the OOB data, we go ahead
* and do normal reads.
*
* There is also another problem, which is that
* since the OOB byte we read doesn't put us
* out of OOB state, and since that byte is most
* likely the TELNET DM (data mark), we would
* stay in the TELNET SYNCH (SYNCHing) state.
* So, clocks to the rescue. If we've "just"
* received a DM, then we test for the
* presence of OOB data when the receive OOB
* fails (and AFTER we did the normal mode read
* to clear "at the mark").
*/
if (SYNCHing) {
int atmark;
(void) ioctl(net, SIOCATMARK, (char *)&atmark);
if (atmark) {
ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
if ((ncc == -1) && (errno == EINVAL)) {
ncc = read(net, netibuf, sizeof (netibuf));
if (sequenceIs(didnetreceive, gotDM)) {
SYNCHing = stilloob(net);
}
}
} else {
ncc = read(net, netibuf, sizeof (netibuf));
}
} else {
ncc = read(net, netibuf, sizeof (netibuf));
}
settimer(didnetreceive);
#else /* !defined(SO_OOBINLINE)) */
ncc = read(net, netibuf, sizeof (netibuf));
#endif /* !defined(SO_OOBINLINE)) */
if (ncc < 0 && errno == EWOULDBLOCK)
ncc = 0;
else {
if (ncc <= 0) {
break;
}
netip = netibuf;
}
#ifdef DIAGNOSTICS
if (diagnostic & (TD_REPORT | TD_NETDATA)) {
sprintf(nfrontp, "td: netread %d chars\r\n", ncc);
nfrontp += strlen(nfrontp);
}
if (diagnostic & TD_NETDATA) {
printdata("nd", netip, ncc);
}
#endif /* DIAGNOSTICS */
}
/*
* Something to read from the pty...
*/
if (FD_ISSET(p, &ibits)) {
pcc = read(p, ptyibuf, BUFSIZ);
if (pcc < 0 && errno == EWOULDBLOCK)
pcc = 0;
else {
if (pcc <= 0)
break;
#ifdef LINEMODE
/*
* If ioctl from pty, pass it through net
*/
if (ptyibuf[0] & TIOCPKT_IOCTL) {
copy_termbuf(ptyibuf+1, pcc-1);
localstat();
pcc = 1;
}
#endif /* LINEMODE */
if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
netclear(); /* clear buffer back */
#ifndef NO_URGENT
/*
* There are client telnets on some
* operating systems get screwed up
* royally if we send them urgent
* mode data.
*/
*nfrontp++ = IAC;
*nfrontp++ = DM;
neturg = nfrontp-1; /* off by one XXX */
#endif
}
if (his_state_is_will(TELOPT_LFLOW) &&
(ptyibuf[0] &
(TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
(void) sprintf(nfrontp, "%c%c%c%c%c%c",
IAC, SB, TELOPT_LFLOW,
ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0,
IAC, SE);
nfrontp += 6;
}
pcc--;
ptyip = ptyibuf+1;
}
}
while (pcc > 0) {
if ((&netobuf[BUFSIZ] - nfrontp) < 2)
break;
c = *ptyip++ & 0377, pcc--;
if (c == IAC)
*nfrontp++ = c;
*nfrontp++ = c;
if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) {
if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
*nfrontp++ = *ptyip++ & 0377;
pcc--;
} else
*nfrontp++ = '\0';
}
}
if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
netflush();
if (ncc > 0)
telrcv();
if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
ptyflush();
}
cleanup();
} /* end of telnet */
#ifndef TCSIG
# ifdef TIOCSIG
# define TCSIG TIOCSIG
# endif
#endif
/*
* Send interrupt to process on other side of pty.
* If it is in raw mode, just write NULL;
* otherwise, write intr char.
*/
interrupt()
{
ptyflush(); /* half-hearted */
#ifdef TCSIG
(void) ioctl(pty, TCSIG, (char *)SIGINT);
#else /* TCSIG */
init_termbuf();
*pfrontp++ = slctab[SLC_IP].sptr ?
(unsigned char)*slctab[SLC_IP].sptr : '\177';
#endif /* TCSIG */
}
/*
* Send quit to process on other side of pty.
* If it is in raw mode, just write NULL;
* otherwise, write quit char.
*/
sendbrk()
{
ptyflush(); /* half-hearted */
#ifdef TCSIG
(void) ioctl(pty, TCSIG, (char *)SIGQUIT);
#else /* TCSIG */
init_termbuf();
*pfrontp++ = slctab[SLC_ABORT].sptr ?
(unsigned char)*slctab[SLC_ABORT].sptr : '\034';
#endif /* TCSIG */
}
sendsusp()
{
#ifdef SIGTSTP
ptyflush(); /* half-hearted */
# ifdef TCSIG
(void) ioctl(pty, TCSIG, (char *)SIGTSTP);
# else /* TCSIG */
*pfrontp++ = slctab[SLC_SUSP].sptr ?
(unsigned char)*slctab[SLC_SUSP].sptr : '\032';
# endif /* TCSIG */
#endif /* SIGTSTP */
}
/*
* When we get an AYT, if ^T is enabled, use that. Otherwise,
* just send back "[Yes]".
*/
recv_ayt()
{
#if defined(SIGINFO) && defined(TCSIG)
if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
(void) ioctl(pty, TCSIG, (char *)SIGINFO);
return;
}
#endif
(void) strcpy(nfrontp, "\r\n[Yes]\r\n");
nfrontp += 9;
}
doeof()
{
#if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN)
extern char oldeofc;
#endif
init_termbuf();
#if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN)
if (!tty_isediting()) {
*pfrontp++ = oldeofc;
return;
}
#endif
*pfrontp++ = slctab[SLC_EOF].sptr ?
(unsigned char)*slctab[SLC_EOF].sptr : '\004';
}
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