/*
- * Copyright (c) 1983 Regents of the University of California.
- * All rights reserved. The Berkeley software License Agreement
- * specifies the terms and conditions for redistribution.
+ * Copyright (c) 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms are permitted
+ * provided that the above copyright notice and this paragraph are
+ * duplicated in all such forms and that any documentation,
+ * advertising materials, and other materials related to such
+ * distribution and use acknowledge that the software was developed
+ * by the University of California, Berkeley. The name of the
+ * University may not 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 MERCHANTIBILITY AND FITNESS FOR A PARTICULAR PURPOSE.
*/
#ifndef lint
char copyright[] =
-"@(#) Copyright (c) 1983 Regents of the University of California.\n\
+"@(#) Copyright (c) 1989 Regents of the University of California.\n\
All rights reserved.\n";
-#endif not lint
+#endif /* not lint */
#ifndef lint
-static char sccsid[] = "@(#)telnetd.c 5.2 (Berkeley) %G%";
-#endif not lint
+static char sccsid[] = "@(#)telnetd.c 5.39 (Berkeley) %G%";
+#endif /* not lint */
-/*
- * Stripped-down telnet server.
- */
-#include <sys/types.h>
-#include <sys/socket.h>
-#include <sys/wait.h>
-#include <sys/file.h>
-#include <sys/stat.h>
-
-#include <netinet/in.h>
-
-#include <arpa/telnet.h>
-
-#include <stdio.h>
-#include <signal.h>
-#include <errno.h>
-#include <sgtty.h>
-#include <netdb.h>
-#include <syslog.h>
-
-#define BELL '\07'
-#define BANNER "\r\n\r\n4.3 BSD UNIX (%s)\r\n\r\r\n\r%s"
-
-char hisopts[256];
-char myopts[256];
-
-char doopt[] = { IAC, DO, '%', 'c', 0 };
-char dont[] = { IAC, DONT, '%', 'c', 0 };
-char will[] = { IAC, WILL, '%', 'c', 0 };
-char wont[] = { IAC, WONT, '%', 'c', 0 };
+#include "telnetd.h"
/*
- * I/O data buffers, pointers, and counters.
+ * I/O data buffers,
+ * pointers, and counters.
*/
char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
-char ptyobuf[BUFSIZ], *pfrontp = ptyobuf, *pbackp = ptyobuf;
-char netibuf[BUFSIZ], *netip = netibuf;
-char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf;
-int pcc, ncc;
+char ptyibuf2[BUFSIZ];
-int pty, net;
-int inter;
-extern char **environ;
-extern int errno;
-char *line;
+#ifdef CRAY
+int hostinfo = 1; /* do we print login banner? */
+#endif
+
+#ifdef CRAY
+extern int newmap; /* nonzero if \n maps to ^M^J */
+int lowpty = 0, highpty = 128; /* low, high pty numbers */
+#endif /* CRAY */
+
+int debug = 0;
+char *progname;
main(argc, argv)
char *argv[];
struct sockaddr_in from;
int on = 1, fromlen;
+ 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 */
+
+#ifdef CRAY
+ if (argc > 0 && !strcmp(*argv, "-h")) {
+ hostinfo = 0;
+ goto top;
+ }
+
+ if (argc > 0 && !strncmp(*argv, "-r", 2)) {
+ char *strchr();
+ char *c;
+
+ *argv += 2;
+ if (**argv == '\0' && argc)
+ argv++, argc--;
+ c = strchr(*argv, '-');
+ if (c) {
+ *c++ = '\0';
+ highpty = atoi(c);
+ } else
+ highpty = -1;
+ lowpty = atoi(*argv);
+ if ((lowpty > highpty) || (lowpty < 0) || (highpty > 999)) {
+ usage:
+ fprintf(stderr, "Usage: telnetd [-debug] [-h] ");
+# ifdef NEWINIT
+ fprintf(stderr, "[-Iinitid] ");
+# endif /* NEWINIT */
+ fprintf(stderr, "[-l] [-rlowpty-highpty] [port]\n");
+ exit(1);
+ }
+ goto top;
+ }
+# ifdef NEWINIT
+ if (argc > 0 && !strncmp(*argv, "-I", 2)) {
+ extern char *gen_id;
+
+ *argv += 2;
+ if (**argv == '\0') {
+ if (argc < 2)
+ goto usage;
+ argv++, argc--;
+ if (**argv == '\0')
+ goto usage;
+ }
+ gen_id = *argv;
+ goto top;
+ }
+# endif /* NEWINIT */
+#endif /* CRAY */
+
+ if (debug) {
+ int s, ns, foo;
+ struct servent *sp;
+ static struct sockaddr_in sin = { AF_INET };
+
+ if (argc > 0) {
+ 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);
+ exit(1);
+ }
+ 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);
+ }
+
+ openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
fromlen = sizeof (from);
- if (getpeername(0, &from, &fromlen) < 0) {
- fprintf(stderr, "%s: ", argv[0]);
+ if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
+ fprintf(stderr, "%s: ", progname);
perror("getpeername");
_exit(1);
}
if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) {
- openlog(argv[0], LOG_PID, 0);
syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
}
- doit(0, &from);
-}
+ net = 0;
+ doit(&from);
+ /* NOTREACHED */
+} /* end of main */
-char *envinit[] = { "TERM=network", 0 };
int cleanup();
+/*
+ * 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);
+ willoption(TELOPT_TTYPE, 1);
+ willoption(TELOPT_TSPEED, 1);
+ while ((hiswants[TELOPT_TTYPE] != hisopts[TELOPT_TTYPE]) ||
+ (hiswants[TELOPT_TSPEED] != hisopts[TELOPT_TSPEED])) {
+ ttloop();
+ }
+ if (hisopts[TELOPT_TSPEED] == OPT_YES) {
+ static char sbbuf[] = { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE };
+
+ bcopy(sbbuf, nfrontp, sizeof sbbuf);
+ nfrontp += sizeof sbbuf;
+ }
+ if (hisopts[TELOPT_TTYPE] == OPT_YES) {
+
+ bcopy(ttytype_sbbuf, nfrontp, sizeof ttytype_sbbuf);
+ nfrontp += sizeof ttytype_sbbuf;
+ }
+ if (hisopts[TELOPT_TSPEED] == OPT_YES) {
+ while (sequenceIs(tspeedsubopt, baseline))
+ ttloop();
+ }
+ if (hisopts[TELOPT_TTYPE] == OPT_YES) {
+ char first[256], last[256];
+
+ while (sequenceIs(ttypesubopt, baseline))
+ ttloop();
+
+ if (!terminaltypeok(&terminaltype[5])) {
+ (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[5]))
+ break;
+ if (strncmp(last, terminaltype, sizeof(last)) == 0) {
+ /*
+ * 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 type, 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()
+{
+ 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);
+}
+
/*
* Get a pty, scan input lines.
*/
-doit(f, who)
- int f;
+doit(who)
struct sockaddr_in *who;
{
char *host, *inet_ntoa();
- int i, p, t;
- struct sgttyb b;
+ int t;
struct hostent *hp;
- char c;
- for (c = 'p'; c <= 's'; c++) {
- struct stat stb;
+ /*
+ * Find an available pty to use.
+ */
+ pty = getpty();
+ if (pty < 0)
+ fatal(net, "All network ports in use");
- line = "/dev/ptyXX";
- line[strlen("/dev/pty")] = c;
- line[strlen("/dev/ptyp")] = '0';
- if (stat(line, &stb) < 0)
- break;
- for (i = 0; i < 16; i++) {
- line[strlen("/dev/ptyp")] = "0123456789abcdef"[i];
- p = open(line, 2);
- if (p > 0)
- goto gotpty;
- }
- }
- fatal(f, "All network ports in use");
- /*NOTREACHED*/
-gotpty:
- dup2(f, 0);
- line[strlen("/dev/")] = 't';
- t = open("/dev/tty", O_RDWR);
- if (t >= 0) {
- ioctl(t, TIOCNOTTY, 0);
- close(t);
- }
- t = open(line, O_RDWR);
- if (t < 0)
- fatalperror(f, line, errno);
- ioctl(t, TIOCGETP, &b);
- b.sg_flags = CRMOD|XTABS|ANYP;
- ioctl(t, TIOCSETP, &b);
- ioctl(p, TIOCGETP, &b);
- b.sg_flags &= ~ECHO;
- ioctl(p, TIOCSETP, &b);
- hp = gethostbyaddr(&who->sin_addr, sizeof (struct in_addr),
+ t = getptyslave();
+
+ /* 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);
- if ((i = fork()) < 0)
- fatalperror(f, "fork", errno);
- if (i)
- telnet(f, p);
- close(f);
- close(p);
- dup2(t, 0);
- dup2(t, 1);
- dup2(t, 2);
- close(t);
- environ = envinit;
- execl("/bin/login", "login", "-h", host, 0);
- fatalperror(f, "/bin/login", errno);
- /*NOTREACHED*/
-}
-
-fatal(f, msg)
- int f;
- char *msg;
-{
- char buf[BUFSIZ];
- (void) sprintf(buf, "telnetd: %s.\r\n", msg);
- (void) write(f, buf, strlen(buf));
- exit(1);
-}
+ /*
+ * get terminal type.
+ */
+ getterminaltype();
+ if (terminaltype == NULL)
+ terminaltype = "TERM=network";
-fatalperror(f, msg, errno)
- int f;
- char *msg;
- int errno;
-{
- char buf[BUFSIZ];
- extern char *sys_errlist[];
+ /*
+ * Start up the login process on the slave side of the terminal
+ */
+ startslave(t, host);
- (void) sprintf(buf, "%s: %s\r\n", msg, sys_errlist[errno]);
- fatal(f, buf);
-}
+ telnet(net, pty); /* begin server processing */
+ /*NOTREACHED*/
+} /* end of doit */
+#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[32];
+ char hostname[MAXHOSTNAMELEN];
+#ifdef CRAY2
+ int termstat();
+ int interrupt(), sendbrk();
+#endif
+#define TABBUFSIZ 512
+ char defent[TABBUFSIZ];
+ char defstrs[TABBUFSIZ];
+#undef TABBUFSIZ
+ char *HE;
+ char *HN;
+ char *IM;
+ void netflush();
+
+ /*
+ * 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 (!myopts[TELOPT_SGA])
+ dooption(TELOPT_SGA);
+ /*
+ * 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).
+ */
+ willoption(TELOPT_ECHO, 1);
+
+#ifdef LINEMODE
+ if (hisopts[TELOPT_LINEMODE] == OPT_NO) {
+ /* Query the peer for linemode support by trying to negotiate
+ * the linemode option.
+ */
+ linemode = 1;
+ editmode = 0;
+ willoption(TELOPT_LINEMODE, 1); /* send do linemode */
+ }
+#endif /* LINEMODE */
+
+ /*
+ * Send along a couple of other options that we wish to negotiate.
+ */
+ willoption(TELOPT_NAWS, 1);
+ dooption(TELOPT_STATUS, 1);
+ flowmode = 1; /* default flow control state */
+ willoption(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 (hiswants[TELOPT_NAWS] != hisopts[TELOPT_NAWS])
+ 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 (hiswants[TELOPT_ECHO] == OPT_YES)
+ willoption(TELOPT_ECHO, 0);
+
+ /*
+ * Finally, to clean things up, we turn on our echo. This
+ * will break stupid 4.2 telnets out of local terminal echo.
+ */
+
+ if (!myopts[TELOPT_ECHO])
+ dooption(TELOPT_ECHO);
+
+ /*
+ * Turn on packet mode, and default to line at at time mode.
+ */
+ (void) ioctl(p, TIOCPKT, (char *)&on);
+#ifdef LINEMODE
+ tty_setlinemode(1);
- net = f, pty = p;
- ioctl(f, FIONBIO, &on);
- ioctl(p, FIONBIO, &on);
- signal(SIGTSTP, SIG_IGN);
- signal(SIGCHLD, cleanup);
+# 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)
+ willoption(TELOPT_TM, 1);
+# endif /* KLUDGELINEMODE */
+#endif /* LINEMODE */
/*
- * Request to do remote echo.
+ * Call telrcv() once to pick up anything received during
+ * terminal type negotiation, 4.2/4.3 determination, and
+ * linemode negotiation.
*/
- dooption(TELOPT_ECHO);
- myopts[TELOPT_ECHO] = 1;
+ telrcv();
+
+ (void) ioctl(f, FIONBIO, (char *)&on);
+ (void) ioctl(p, FIONBIO, (char *)&on);
+#ifdef CRAY2
+ init_termdriver(f, p, interrupt, sendbrk);
+#endif
+
+#if defined(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);
+
+#if defined(CRAY2)
+ /*
+ * Cray-2 will send a signal when pty modes are changed by slave
+ * side. Set up signal handler now.
+ */
+ if ((int)signal(SIGUSR1, termstat) < 0)
+ perror("signal");
+ else if (ioctl(p, TCSIGME, (char *)SIGUSR1) < 0)
+ perror("ioctl:TCSIGME");
+ /*
+ * Make processing loop check terminal characteristics early on.
+ */
+ termstat();
+#endif
+
+ (void) setpgrp(0, 0);
+
/*
* 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.
*/
- gethostname(hostname, sizeof (hostname));
- sprintf(nfrontp, BANNER, hostname, "");
- nfrontp += strlen(nfrontp);
+
+ (void) gethostname(hostname, sizeof (hostname));
+
+ if (getent(defent, "default") == 1) {
+ char *getstr();
+ char *cp=defstrs;
+
+ HE = getstr("he", &cp);
+ HN = getstr("hn", &cp);
+ IM = getstr("im", &cp);
+ if (HN && *HN)
+ (void) strcpy(hostname, HN);
+ if (IM == 0)
+ IM = "";
+ } else {
+#ifdef CRAY
+ if (hostinfo == 0)
+ IM = 0;
+ else
+#endif
+ IM = DEFAULT_IM;
+ HE = 0;
+ }
+ edithost(HE, hostname);
+ if (IM && *IM)
+ putf(IM, ptyibuf2);
+
+ if (pcc)
+ (void) strncat(ptyibuf2, ptyip, pcc+1);
+ ptyip = ptyibuf2;
+ pcc = strlen(ptyip);
+
for (;;) {
- int ibits = 0, obits = 0;
+ fd_set ibits, obits, xbits;
register int c;
+ if (ncc < 0 && pcc < 0)
+ break;
+
+#ifdef CRAY2
+ if (needtermstat)
+ _termstat();
+#endif /* CRAY2 */
+ 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)
- obits |= (1 << f);
- else
- ibits |= (1 << p);
- if (pfrontp - pbackp || ncc > 0)
- obits |= (1 << p);
- else
- ibits |= (1 << f);
- if (ncc < 0 && pcc < 0)
- break;
- select(16, &ibits, &obits, 0, 0);
- if (ibits == 0 && obits == 0) {
+ 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 (ibits & (1 << f)) {
- ncc = read(f, netibuf, BUFSIZ);
- if (ncc < 0 && errno == EWOULDBLOCK)
- ncc = 0;
- else {
- if (ncc <= 0)
- break;
- netip = netibuf;
+ 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;
+
+ (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;
+ }
}
/*
* Something to read from the pty...
*/
- if (ibits & (1 << p)) {
+ if (FD_ISSET(p, &ibits)) {
pcc = read(p, ptyibuf, BUFSIZ);
if (pcc < 0 && errno == EWOULDBLOCK)
pcc = 0;
else {
if (pcc <= 0)
break;
- ptyip = ptyibuf;
+#ifndef CRAY2
+#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 */
+ *nfrontp++ = IAC;
+ *nfrontp++ = DM;
+ neturg = nfrontp-1; /* off by one XXX */
+ }
+ if (hisopts[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;
+#else /* CRAY2 */
+ if (!uselinemode) {
+ pcc = term_output(ptyibuf, ptyibuf2,
+ pcc, BUFSIZ);
+ ptyip = ptyibuf2;
+ } else
+ ptyip = ptyibuf;
+#endif /* CRAY2 */
}
}
c = *ptyip++ & 0377, pcc--;
if (c == IAC)
*nfrontp++ = c;
+#ifdef CRAY2
+ else if (c == '\n' &&
+ myopts[TELOPT_BINARY] == OPT_NO && newmap)
+ *nfrontp++ = '\r';
+#endif /* CRAY2 */
*nfrontp++ = c;
+ if ((c == '\r') && (myopts[TELOPT_BINARY] == OPT_NO)) {
+ if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
+ *nfrontp++ = *ptyip++ & 0377;
+ pcc--;
+ } else
+ *nfrontp++ = '\0';
+ }
}
- if ((obits & (1 << f)) && (nfrontp - nbackp) > 0)
+ if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
netflush();
if (ncc > 0)
telrcv();
- if ((obits & (1 << p)) && (pfrontp - pbackp) > 0)
+ if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
ptyflush();
}
cleanup();
-}
+} /* end of telnet */
-/*
- * State for recv fsm
- */
-#define TS_DATA 0 /* base state */
-#define TS_IAC 1 /* look for double IAC's */
-#define TS_CR 2 /* CR-LF ->'s CR */
-#define TS_BEGINNEG 3 /* throw away begin's... */
-#define TS_ENDNEG 4 /* ...end's (suboption negotiation) */
-#define TS_WILL 5 /* will option negotiation */
-#define TS_WONT 6 /* wont " */
-#define TS_DO 7 /* do " */
-#define TS_DONT 8 /* dont " */
-
-telrcv()
-{
- register int c;
- static int state = TS_DATA;
- struct sgttyb b;
-
- while (ncc > 0) {
- if ((&ptyobuf[BUFSIZ] - pfrontp) < 2)
- return;
- c = *netip++ & 0377, ncc--;
- switch (state) {
-
- case TS_DATA:
- if (c == IAC) {
- state = TS_IAC;
- break;
- }
- if (inter > 0)
- break;
- *pfrontp++ = c;
- if (!myopts[TELOPT_BINARY] && c == '\r')
- state = TS_CR;
- break;
-
- case TS_CR:
- if (c && c != '\n')
- *pfrontp++ = c;
- state = TS_DATA;
- break;
-
- case TS_IAC:
- switch (c) {
-
- /*
- * Send the process on the pty side an
- * interrupt. Do this with a NULL or
- * interrupt char; depending on the tty mode.
- */
- case BREAK:
- case IP:
- interrupt();
- break;
-
- /*
- * Are You There?
- */
- case AYT:
- strcpy(nfrontp, "\r\n[Yes]\r\n");
- nfrontp += 9;
- break;
-
- /*
- * Erase Character and
- * Erase Line
- */
- case EC:
- case EL:
- ptyflush(); /* half-hearted */
- ioctl(pty, TIOCGETP, &b);
- *pfrontp++ = (c == EC) ?
- b.sg_erase : b.sg_kill;
- break;
-
- /*
- * Check for urgent data...
- */
- case DM:
- break;
-
- /*
- * Begin option subnegotiation...
- */
- case SB:
- state = TS_BEGINNEG;
- continue;
-
- case WILL:
- case WONT:
- case DO:
- case DONT:
- state = TS_WILL + (c - WILL);
- continue;
-
- case IAC:
- *pfrontp++ = c;
- break;
- }
- state = TS_DATA;
- break;
-
- case TS_BEGINNEG:
- if (c == IAC)
- state = TS_ENDNEG;
- break;
-
- case TS_ENDNEG:
- state = c == SE ? TS_DATA : TS_BEGINNEG;
- break;
-
- case TS_WILL:
- if (!hisopts[c])
- willoption(c);
- state = TS_DATA;
- continue;
-
- case TS_WONT:
- if (hisopts[c])
- wontoption(c);
- state = TS_DATA;
- continue;
-
- case TS_DO:
- if (!myopts[c])
- dooption(c);
- state = TS_DATA;
- continue;
-
- case TS_DONT:
- if (myopts[c]) {
- myopts[c] = 0;
- sprintf(nfrontp, wont, c);
- nfrontp += sizeof (wont) - 2;
- }
- state = TS_DATA;
- continue;
-
- default:
- printf("telnetd: panic state=%d\n", state);
- exit(1);
- }
- }
-}
-
-willoption(option)
- int option;
-{
- char *fmt;
-
- switch (option) {
-
- case TELOPT_BINARY:
- mode(RAW, 0);
- goto common;
-
- case TELOPT_ECHO:
- mode(0, ECHO|CRMOD);
- /*FALL THRU*/
-
- case TELOPT_SGA:
- common:
- hisopts[option] = 1;
- fmt = doopt;
- break;
-
- case TELOPT_TM:
- fmt = dont;
- break;
-
- default:
- fmt = dont;
- break;
- }
- sprintf(nfrontp, fmt, option);
- nfrontp += sizeof (dont) - 2;
-}
-
-wontoption(option)
- int option;
-{
- char *fmt;
-
- switch (option) {
-
- case TELOPT_ECHO:
- mode(ECHO|CRMOD, 0);
- goto common;
-
- case TELOPT_BINARY:
- mode(0, RAW);
- /*FALL THRU*/
-
- case TELOPT_SGA:
- common:
- hisopts[option] = 0;
- fmt = dont;
- break;
-
- default:
- fmt = dont;
- }
- sprintf(nfrontp, fmt, option);
- nfrontp += sizeof (doopt) - 2;
-}
-
-dooption(option)
- int option;
-{
- char *fmt;
-
- switch (option) {
-
- case TELOPT_TM:
- fmt = wont;
- break;
-
- case TELOPT_ECHO:
- mode(ECHO|CRMOD, 0);
- goto common;
-
- case TELOPT_BINARY:
- mode(RAW, 0);
- /*FALL THRU*/
-
- case TELOPT_SGA:
- common:
- fmt = will;
- break;
-
- default:
- fmt = wont;
- break;
- }
- sprintf(nfrontp, fmt, option);
- nfrontp += sizeof (doopt) - 2;
-}
-
-mode(on, off)
- int on, off;
-{
- struct sgttyb b;
-
- ptyflush();
- ioctl(pty, TIOCGETP, &b);
- b.sg_flags |= on;
- b.sg_flags &= ~off;
- ioctl(pty, TIOCSETP, &b);
-}
+#ifndef TCSIG
+# ifdef TIOCSIG
+# define TCSIG TIOCSIG
+# endif
+#endif
/*
* Send interrupt to process on other side of pty.
*/
interrupt()
{
- struct sgttyb b;
- struct tchars tchars;
-
ptyflush(); /* half-hearted */
- ioctl(pty, TIOCGETP, &b);
- if (b.sg_flags & RAW) {
- *pfrontp++ = '\0';
- return;
- }
- *pfrontp++ = ioctl(pty, TIOCGETC, &tchars) < 0 ?
- '\177' : tchars.t_intrc;
-}
-ptyflush()
-{
- int n;
-
- if ((n = pfrontp - pbackp) > 0)
- n = write(pty, pbackp, n);
- if (n < 0)
- return;
- pbackp += n;
- if (pbackp == pfrontp)
- pbackp = pfrontp = ptyobuf;
+#ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGINT);
+#else /* TCSIG */
+ init_termbuf();
+ *pfrontp++ = slctab[SLC_IP].sptr ? *slctab[SLC_IP].sptr : '\177';
+#endif /* TCSIG */
}
-netflush()
+/*
+ * Send quit to process on other side of pty.
+ * If it is in raw mode, just write NULL;
+ * otherwise, write quit char.
+ */
+sendbrk()
{
- int n;
-
- if ((n = nfrontp - nbackp) > 0)
- n = write(net, nbackp, n);
- if (n < 0) {
- if (errno == EWOULDBLOCK)
- return;
- /* should blow this guy away... */
- return;
- }
- nbackp += n;
- if (nbackp == nfrontp)
- nbackp = nfrontp = netobuf;
+ ptyflush(); /* half-hearted */
+#ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGQUIT);
+#else /* TCSIG */
+ init_termbuf();
+ *pfrontp++ = slctab[SLC_ABORT].sptr ? *slctab[SLC_ABORT].sptr : '\034';
+#endif /* TCSIG */
}
-cleanup()
+sendsusp()
{
-
- rmut();
- vhangup(); /* XXX */
- shutdown(net, 2);
- kill(0, SIGKILL);
- exit(1);
+#ifdef SIGTSTP
+ ptyflush(); /* half-hearted */
+# ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGTSTP);
+# else /* TCSIG */
+ *pfrontp++ = slctab[SLC_SUSP].sptr ? *slctab[SLC_SUSP].sptr : '\032';
+# endif /* TCSIG */
+#endif /* SIGTSTP */
}
-#include <utmp.h>
-
-struct utmp wtmp;
-char wtmpf[] = "/usr/adm/wtmp";
-char utmpf[] = "/etc/utmp";
-#define SCPYN(a, b) strncpy(a, b, sizeof(a))
-#define SCMPN(a, b) strncmp(a, b, sizeof(a))
-
-rmut()
+doeof()
{
- register f;
- int found = 0;
- struct utmp *u, *utmp;
- int nutmp;
- struct stat statbf;
-
- f = open(utmpf, O_RDWR);
- if (f >= 0) {
- fstat(f, &statbf);
- utmp = (struct utmp *)malloc(statbf.st_size);
- if (!utmp)
- syslog(LOG_ERR, "utmp malloc failed");
- if (statbf.st_size && utmp) {
- nutmp = read(f, utmp, statbf.st_size);
- nutmp /= sizeof(struct utmp);
-
- for (u = utmp ; u < &utmp[nutmp] ; u++) {
- if (SCMPN(u->ut_line, line+5) ||
- u->ut_name[0]==0)
- continue;
- lseek(f, ((long)u)-((long)utmp), L_SET);
- SCPYN(u->ut_name, "");
- SCPYN(u->ut_host, "");
- time(&u->ut_time);
- write(f, (char *)u, sizeof(wtmp));
- found++;
- }
- }
- close(f);
- }
- if (found) {
- f = open(wtmpf, O_WRONLY|O_APPEND);
- if (f >= 0) {
- SCPYN(wtmp.ut_line, line+5);
- SCPYN(wtmp.ut_name, "");
- SCPYN(wtmp.ut_host, "");
- time(&wtmp.ut_time);
- write(f, (char *)&wtmp, sizeof(wtmp));
- close(f);
- }
- }
- chmod(line, 0666);
- chown(line, 0, 0);
- line[strlen("/dev/")] = 'p';
- chmod(line, 0666);
- chown(line, 0, 0);
+ init_termbuf();
+
+ *pfrontp++ = slctab[SLC_EOF].sptr ? *slctab[SLC_EOF].sptr : '\004';
}