/*
* Copyright (c) 1989 Regents of the University of California.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. 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 BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
char copyright[] =
"@(#) Copyright (c) 1989 Regents of the University of California.\n"
"All rights reserved.\n";
/*
* From: @(#)telnetd.c 5.48 (Berkeley) 3/1/91
*/
char telnetd_rcsid[] =
"$Id: telnetd.c,v 1.24 2000/04/12 21:36:12 dholland Exp $";
#include "../version.h"
#include <netdb.h>
#include <termcap.h>
#include <netinet/in.h>
/* #include <netinet/ip.h> */ /* Don't think this is used at all here */
#include <arpa/inet.h>
#include <assert.h>
#include "telnetd.h"
#include "pathnames.h"
#include "setproctitle.h"
#if defined(AUTHENTICATE)
#include <libtelnet/auth.h>
#include <libtelnet/auth-proto.h>
#include <libtelnet/misc-proto.h>
int auth_level = 0;
#endif
#if defined(SecurID)
int require_SecurID = 0;
#endif
/* In Linux, this is an enum */
#if defined(__linux__) || defined(IPPROTO_IP)
#define HAS_IPPROTO_IP
#endif
static void doit(struct sockaddr_in *who);
static int terminaltypeok(const char *s);
/*
* I/O data buffers,
* pointers, and counters.
*/
char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
char ptyibuf2[BUFSIZ];
int hostinfo = 1; /* do we print login banner? */
int debug = 0;
int keepalive = 1;
char *loginprg = _PATH_LOGIN;
char *progname;
extern void usage(void);
int
main(int argc, char *argv[], char *env[])
{
struct sockaddr_in from;
int on = 1;
socklen_t fromlen;
register int ch;
#if defined(HAS_IPPROTO_IP) && defined(IP_TOS)
int tos = -1;
#endif
initsetproctitle(argc, argv, env);
pfrontp = pbackp = ptyobuf;
netip = netibuf;
nfrontp = nbackp = netobuf;
#if defined(ENCRYPT)
nclearto = 0;
#endif
progname = *argv;
while ((ch = getopt(argc, argv, "d:a:e:lhnr:I:D:B:sS:a:X:L:")) != EOF) {
switch(ch) {
#ifdef AUTHENTICATE
case 'a':
/*
* Check for required authentication level
*/
if (strcmp(optarg, "debug") == 0) {
extern int auth_debug_mode;
auth_debug_mode = 1;
} else if (strcasecmp(optarg, "none") == 0) {
auth_level = 0;
} else if (strcasecmp(optarg, "other") == 0) {
auth_level = AUTH_OTHER;
} else if (strcasecmp(optarg, "user") == 0) {
auth_level = AUTH_USER;
} else if (strcasecmp(optarg, "valid") == 0) {
auth_level = AUTH_VALID;
} else if (strcasecmp(optarg, "off") == 0) {
/*
* This hack turns off authentication
*/
auth_level = -1;
} else {
fprintf(stderr,
"telnetd: unknown authorization level for -a\n");
}
break;
#endif /* AUTHENTICATE */
#ifdef BFTPDAEMON
case 'B':
bftpd++;
break;
#endif /* BFTPDAEMON */
case 'd':
if (strcmp(optarg, "ebug") == 0) {
debug++;
break;
}
usage();
/* NOTREACHED */
break;
#ifdef DIAGNOSTICS
case 'D':
/*
* Check for desired diagnostics capabilities.
*/
if (!strcmp(optarg, "report")) {
diagnostic |= TD_REPORT|TD_OPTIONS;
} else if (!strcmp(optarg, "exercise")) {
diagnostic |= TD_EXERCISE;
} else if (!strcmp(optarg, "netdata")) {
diagnostic |= TD_NETDATA;
} else if (!strcmp(optarg, "ptydata")) {
diagnostic |= TD_PTYDATA;
} else if (!strcmp(optarg, "options")) {
diagnostic |= TD_OPTIONS;
} else {
usage();
/* NOT REACHED */
}
break;
#endif /* DIAGNOSTICS */
#ifdef AUTHENTICATE
case 'e':
if (strcmp(optarg, "debug") == 0) {
extern int auth_debug_mode;
auth_debug_mode = 1;
break;
}
usage();
/* NOTREACHED */
break;
#endif /* AUTHENTICATE */
case 'h':
hostinfo = 0;
break;
#ifdef LINEMODE
case 'l':
alwayslinemode = 1;
break;
#endif /* LINEMODE */
case 'L':
loginprg = strdup(optarg);
/* XXX what if strdup fails? */
break;
case 'n':
keepalive = 0;
break;
#ifdef SecurID
case 's':
/* SecurID required */
require_SecurID = 1;
break;
#endif /* SecurID */
case 'S':
#ifdef HAS_GETTOS
if ((tos = parsetos(optarg, "tcp")) < 0)
fprintf(stderr, "%s%s%s\n",
"telnetd: Bad TOS argument '", optarg,
"'; will try to use default TOS");
#else
fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
"-S flag not supported\n");
#endif
break;
#ifdef AUTHENTICATE
case 'X':
/*
* Check for invalid authentication types
*/
auth_disable_name(optarg);
break;
#endif /* AUTHENTICATE */
default:
fprintf(stderr, "telnetd: %c: unknown option\n", ch);
/* FALLTHROUGH */
case '?':
usage();
/* NOTREACHED */
}
}
argc -= optind;
argv += optind;
if (debug) {
int s, ns;
socklen_t foo;
struct servent *sp;
struct sockaddr_in sn;
memset(&sn, 0, sizeof(sn));
sn.sin_family = AF_INET;
if (argc > 1) {
usage();
/* NOTREACHED */
} else if (argc == 1) {
if ((sp = getservbyname(*argv, "tcp"))!=NULL) {
sn.sin_port = sp->s_port;
}
else {
int pt = atoi(*argv);
if (pt <= 0) {
fprintf(stderr, "telnetd: %s: bad port number\n",
*argv);
usage();
/* NOTREACHED */
}
sn.sin_port = htons(pt);
}
} else {
sp = getservbyname("telnet", "tcp");
if (sp == 0) {
fprintf(stderr, "telnetd: tcp/telnet: unknown service\n");
exit(1);
}
sn.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 *)&sn, sizeof(sn)) < 0) {
perror("bind");
exit(1);
}
if (listen(s, 1) < 0) {
perror("listen");
exit(1);
}
foo = sizeof(sn);
ns = accept(s, (struct sockaddr *)&sn, &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);
}
if (keepalive &&
setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) {
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
}
#if defined(HAS_IPPROTO_IP) && defined(IP_TOS)
{
# if defined(HAS_GETTOS)
struct tosent *tp;
if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
tos = tp->t_tos;
# endif
if (tos < 0)
tos = 020; /* Low Delay bit */
if (tos
&& (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
&& (errno != ENOPROTOOPT) )
syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
}
#endif /* defined(HAS_IPPROTO_IP) && defined(IP_TOS) */
net = 0;
doit(&from);
/* NOTREACHED */
return 0;
} /* end of main */
void
usage(void)
{
fprintf(stderr, "Usage: telnetd");
#ifdef AUTHENTICATE
fprintf(stderr, " [-a (debug|other|user|valid|off)]\n\t");
#endif
#ifdef BFTPDAEMON
fprintf(stderr, " [-B]");
#endif
fprintf(stderr, " [-debug]");
#ifdef DIAGNOSTICS
fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
#endif
#ifdef AUTHENTICATE
fprintf(stderr, " [-edebug]");
#endif
fprintf(stderr, " [-h]");
#ifdef LINEMODE
fprintf(stderr, " [-l]");
#endif
fprintf(stderr, " [-L login_program]");
fprintf(stderr, " [-n]");
#ifdef SecurID
fprintf(stderr, " [-s]");
#endif
#ifdef AUTHENTICATE
fprintf(stderr, " [-X auth-type]");
#endif
fprintf(stderr, " [port]\n");
exit(1);
}
/*
* getterminaltype
*
* Ask the other end to send along its terminal type and speed.
* Output is the variable terminaltype filled in.
*/
static void _gettermname(void);
static
int
getterminaltype(char *name)
{
int retval = -1;
(void)name;
settimer(baseline);
#if defined(AUTHENTICATE)
/*
* Handle the Authentication option before we do anything else.
*/
send_do(TELOPT_AUTHENTICATION, 1);
while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
ttloop();
if (his_state_is_will(TELOPT_AUTHENTICATION)) {
retval = auth_wait(name);
}
#endif
#if defined(ENCRYPT)
send_will(TELOPT_ENCRYPT, 1);
#endif
send_do(TELOPT_TTYPE, 1);
send_do(TELOPT_TSPEED, 1);
send_do(TELOPT_XDISPLOC, 1);
send_do(TELOPT_ENVIRON, 1);
while (
#if defined(ENCRYPT)
his_do_dont_is_changing(TELOPT_ENCRYPT) ||
#endif
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 defined(ENCRYPT)
/*
* Wait for the negotiation of what type of encryption we can
* send with. If autoencrypt is not set, this will just return.
*/
if (his_state_is_will(TELOPT_ENCRYPT)) {
encrypt_wait();
}
#endif
if (his_state_is_will(TELOPT_TSPEED)) {
netoprintf("%c%c%c%c%c%c",
IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE);
}
if (his_state_is_will(TELOPT_XDISPLOC)) {
netoprintf("%c%c%c%c%c%c",
IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE);
}
if (his_state_is_will(TELOPT_ENVIRON)) {
netoprintf("%c%c%c%c%c%c",
IAC, SB, TELOPT_ENVIRON, TELQUAL_SEND, IAC, SE);
}
if (his_state_is_will(TELOPT_TTYPE)) {
netoprintf("%c%c%c%c%c%c",
IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE);
}
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)) {
/*
* Due to state.c, terminaltype points to a static char[41].
* Therefore, this assert cannot fail, and therefore, strings
* arising from "terminaltype" can be safely strcpy'd into
* first[] or last[].
*/
assert(strlen(terminaltype) < sizeof(first));
strcpy(first, terminaltype);
for(;;) {
/*
* Save the unknown name, and request the next name.
*/
strcpy(last, terminaltype);
_gettermname();
assert(strlen(terminaltype) < sizeof(first));
if (terminaltypeok(terminaltype))
break;
if (!strcmp(last, terminaltype) ||
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 (!strcmp(first, terminaltype))
break;
/*
* Get the terminal name one more time, so that
* RFC1091 compliant telnets will cycle back to
* the start of the list.
*/
_gettermname();
assert(strlen(terminaltype) < sizeof(first));
if (strcmp(first, terminaltype)) {
/*
* first[] came from terminaltype, so it must fit
* back in.
*/
strcpy(terminaltype, first);
}
break;
}
}
}
}
return(retval);
} /* end of getterminaltype */
static
void
_gettermname(void)
{
/*
* 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);
netoprintf("%c%c%c%c%c%c", IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE);
while (sequenceIs(ttypesubopt, baseline))
ttloop();
}
static int
terminaltypeok(const char *s)
{
/* char buf[2048]; */
if (terminaltype == NULL)
return(1);
/*
* Fix from Chris Evans: if it has a / in it, termcap will
* treat it as a filename. Oops.
*/
if (strchr(s, '/')) {
return 0;
}
/*
* If it's absurdly long, accept it without asking termcap.
*
* This means that it won't get seen again until after login,
* at which point exploiting buffer problems in termcap doesn't
* gain one anything.
*
* It's possible this limit ought to be raised to 128, but nothing
* in my termcap is more than 64, 64 is _plenty_ for most, and while
* buffers aren't likely to be smaller than 64, they might be 80 and
* thus less than 128.
*/
if (strlen(s) > 63) {
return 0;
}
/*
* 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.
*/
/*
* Don't do this - tgetent is not really trustworthy. Assume
* the terminal type is one we know; terminal types are pretty
* standard now. And if it isn't, it's unlikely we're going to
* know anything else the remote telnet might send as an alias
* for it.
*
* if (tgetent(buf, s) == 0)
* return(0);
*/
return(1);
}
#ifndef MAXHOSTNAMELEN
#define MAXHOSTNAMELEN 64
#endif /* MAXHOSTNAMELEN */
char host_name[MAXHOSTNAMELEN];
char remote_host_name[MAXHOSTNAMELEN];
extern void telnet(int, int);
/*
* Get a pty, scan input lines.
*/
static void
doit(struct sockaddr_in *who)
{
const char *host;
struct hostent *hp;
int level;
char user_name[256];
/*
* Find an available pty to use.
*/
pty = getpty();
if (pty < 0)
fatal(net, "All network ports in use");
/* 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);
/*
* We must make a copy because Kerberos is probably going
* to also do a gethost* and overwrite the static data...
*/
{
int i;
strncpy(remote_host_name, host, sizeof(remote_host_name)-1);
remote_host_name[sizeof(remote_host_name)-1] = 0;
/* Disallow funnies. */
for (i=0; remote_host_name[i]; i++) {
if (remote_host_name[i]<=32 || remote_host_name[i]>126)
remote_host_name[i] = '?';
}
}
host = remote_host_name;
/* Get local host name */
{
struct hostent *h;
gethostname(host_name, sizeof(host_name));
h = gethostbyname(host_name);
if (h) {
strncpy(host_name, h->h_name, sizeof(host_name));
host_name[sizeof(host_name)-1] = 0;
}
}
#if defined(AUTHENTICATE) || defined(ENCRYPT)
auth_encrypt_init(host_name, host, "TELNETD", 1);
#endif
init_env();
/*
* get terminal type.
*/
*user_name = 0;
level = getterminaltype(user_name);
setenv("TERM", terminaltype ? terminaltype : "network", 1);
/* TODO list stuff provided by Laszlo Vecsey <master@internexus.net> */
/*
* Set REMOTEHOST environment variable
*/
setproctitle("%s", host);
setenv("REMOTEHOST", host, 0);
/*
* Start up the login process on the slave side of the terminal
*/
startslave(host, level, user_name);
telnet(net, pty); /* begin server processing */
/*NOTREACHED*/
} /* end of doit */
/*
* Main loop. Select from pty and network, and
* hand data to telnet receiver finite state machine.
*/
void telnet(int f, int p)
{
int on = 1;
char *HE;
const char *IM;
/*
* Initialize the slc mapping table.
*/
get_slc_defaults();
/*
* 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.
*/
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)) {
DIAG(TD_OPTIONS, netoprintf("td: simulating recv\r\n"););
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);
/*
* Turn on packet mode
*/
ioctl(p, TIOCPKT, (char *)&on);
#if defined(LINEMODE) && defined(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 /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
/*
* Call telrcv() once to pick up anything received during
* terminal type negotiation, 4.2/4.3 determination, and
* linemode negotiation.
*/
telrcv();
ioctl(f, FIONBIO, (char *)&on);
ioctl(p, FIONBIO, (char *)&on);
#if defined(SO_OOBINLINE)
setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on);
#endif /* defined(SO_OOBINLINE) */
#ifdef SIGTSTP
signal(SIGTSTP, SIG_IGN);
#endif
#ifdef SIGTTOU
/*
* Ignoring SIGTTOU keeps the kernel from blocking us
* in ttioct() in /sys/tty.c.
*/
signal(SIGTTOU, SIG_IGN);
#endif
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.
*/
if (getenv("USER"))
hostinfo = 0;
IM = DEFAULT_IM;
HE = 0;
edithost(HE, host_name);
if (hostinfo && *IM)
putf(IM, ptyibuf2);
if (pcc) 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 */
DIAG(TD_REPORT, netoprintf("td: Entering processing loop\r\n"););
for (;;) {
fd_set ibits, obits, xbits;
int c, hifd;
if (ncc < 0 && pcc < 0)
break;
FD_ZERO(&ibits);
FD_ZERO(&obits);
FD_ZERO(&xbits);
hifd=0;
/*
* Never look for input if there's still
* stuff in the corresponding output buffer
*/
if (nfrontp - nbackp || pcc > 0) {
FD_SET(f, &obits);
if (f >= hifd) hifd = f+1;
}
else {
FD_SET(p, &ibits);
if (p >= hifd) hifd = p+1;
}
if (pfrontp - pbackp || ncc > 0) {
FD_SET(p, &obits);
if (p >= hifd) hifd = p+1;
}
else {
FD_SET(f, &ibits);
if (f >= hifd) hifd = f+1;
}
if (!SYNCHing) {
FD_SET(f, &xbits);
if (f >= hifd) hifd = f+1;
}
if ((c = select(hifd, &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)) {
#if !defined(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;
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;
}
DIAG((TD_REPORT | TD_NETDATA),
netoprintf("td: netread %d chars\r\n", ncc););
DIAG(TD_NETDATA, printdata("nd", netip, ncc));
}
/*
* Something to read from the pty...
*/
if (FD_ISSET(p, &ibits)) {
pcc = read(p, ptyibuf, BUFSIZ);
/*
* On some systems, if we try to read something
* off the master side before the slave side is
* opened, we get EIO.
*/
if (pcc < 0 && (errno == EWOULDBLOCK || errno == EIO)) {
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.
*/
netoprintf("%c%c", IAC, DM);
neturg = nfrontp-1; /* off by one XXX */
#endif
}
if (his_state_is_will(TELOPT_LFLOW) &&
(ptyibuf[0] &
(TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
netoprintf("%c%c%c%c%c%c",
IAC, SB, TELOPT_LFLOW,
ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0,
IAC, SE);
}
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(0);
} /* 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.
*/
void interrupt(void) {
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.
*/
void sendbrk(void) {
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 */
}
void sendsusp(void) {
#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]".
*/
void recv_ayt(void) {
#if defined(SIGINFO) && defined(TCSIG)
if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
(void) ioctl(pty, TCSIG, (char *)SIGINFO);
return;
}
#endif
netoprintf("\r\n[Yes]\r\n");
}
void doeof(void) {
init_termbuf();
#if defined(LINEMODE) && (VEOF == VMIN)
if (!tty_isediting()) {
extern char oldeofc;
*pfrontp++ = oldeofc;
return;
}
#endif
*pfrontp++ = slctab[SLC_EOF].sptr ?
(unsigned char)*slctab[SLC_EOF].sptr : '\004';
}
Radix cross Linux
The main Radix cross Linux repository contains the build scripts of packages, which have the most complete and common functionality for desktop machines
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