/* * 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 5.46 (Berkeley) 6/28/90"; #endif /* not lint */ #include "telnetd.h" /* * I/O data buffers, * pointers, and counters. */ char ptyibuf[BUFSIZ], *ptyip = ptyibuf; char ptyibuf2[BUFSIZ]; #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; /* low, high pty numbers */ #endif /* CRAY */ int debug = 0; char *progname; #if defined(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; #ifdef CRAY /* * Get number of pty's before trying to process options, * which may include changing pty range. */ highpty = getnpty(); #endif /* CRAY */ 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; /* * Allow the specification of alterations to the pty search * range. It is legal to specify only one, and not change the * other from its default. */ *argv += 2; if (**argv == '\0' && argc) argv++, argc--; c = strchr(*argv, '-'); if (c) { *c++ = '\0'; highpty = atoi(c); } if (**argv != '\0') lowpty = atoi(*argv); if ((lowpty > highpty) || (lowpty < 0) || (highpty > 32767)) { usage(); /* NOT REACHED */ } goto top; } # ifdef NEWINIT if (argc > 0 && !strncmp(*argv, "-I", 2)) { extern char *gen_id; *argv += 2; if (**argv == '\0') { if (argc < 2) { usage(); /* NOT REACHED */ } argv++, argc--; if (**argv == '\0') { usage(); /* NOT REACHED */ } } gen_id = *argv; goto top; } # endif /* NEWINIT */ #endif /* CRAY */ #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); } if (setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) { syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); } #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; doit(&from); /* NOTREACHED */ } /* end of main */ usage() { fprintf(stderr, "Usage: telnetd [-debug] [-h]"); #ifdef NEWINIT fprintf(stderr, " [-Iinitid]"); #endif /* NEWINIT */ #ifdef DIAGNOSTICS fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]"); #endif /* DIAGNOSTICS */ #ifdef LINEMODE fprintf(stderr, " [-l]"); #endif #ifdef CRAY fprintf(stderr, " [-r[lowpty]-[highpty]]"); #endif #ifdef BFTPDAEMON fprintf(stderr, " [-B]"); #endif /* BFTPDAEMON */ fprintf(stderr, " [port]\n"); exit(1); } void 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); 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() { /* * 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); } /* * Get a pty, scan input lines. */ doit(who) struct sockaddr_in *who; { char *host, *inet_ntoa(); int t; struct hostent *hp; #if BSD > 43 extern char *line; if (openpty(&pty, &t, line, NULL, NULL) == -1) fatal(net, "All network ports in use"); init_termbuf(); #else /* * Find an available pty to use. */ pty = getpty(); if (pty < 0) fatal(net, "All network ports in use"); t = getptyslave(); #endif /* 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); 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(t, host); 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[MAXHOSTNAMELEN]; #if defined(CRAY2) && defined(UNICOS5) 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 (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)) { #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); /* * Turn on packet mode, and default to line at at time mode. */ (void) ioctl(p, TIOCPKT, (char *)&on); #ifdef LINEMODE tty_setlinemode(1); # 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 */ #endif /* LINEMODE */ /* * 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); #if defined(CRAY2) && defined(UNICOS5) 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) && defined(UNICOS5) /* * 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 #ifdef NO_SETSID (void) setpgrp(0, 0); #else (void) setsid(); #endif #if defined(TIOCSCTTY) && defined(CRAY) ioctl(p, TIOCSCTTY, 0); #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. */ (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); #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; #if defined(CRAY2) && defined(UNICOS5) if (needtermstat) _termstat(); #endif /* defined(CRAY2) && defined(UNICOS5) */ 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)) { #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; } #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; #if !defined(CRAY2) || !defined(UNICOS5) #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 */ #ifdef notdef /* * We really should have this in, but * there are client telnets on some * operating systems get screwed up * royally if we send them urgent * mode data. So, for now, we'll not * do this... */ *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; #else /* defined(CRAY2) && defined(UNICOS5) */ if (!uselinemode) { unpcc = pcc; unptyip = ptyibuf; pcc = term_output(&unptyip, ptyibuf2, &unpcc, BUFSIZ); ptyip = ptyibuf2; } else ptyip = ptyibuf; #endif /* defined(CRAY2) && defined(UNICOS5) */ } } while (pcc > 0) { if ((&netobuf[BUFSIZ] - nfrontp) < 2) break; c = *ptyip++ & 0377, pcc--; if (c == IAC) *nfrontp++ = c; #if defined(CRAY2) && defined(UNICOS5) else if (c == '\n' && my_state_is_wont(TELOPT_BINARY) && newmap) *nfrontp++ = '\r'; #endif /* defined(CRAY2) && defined(UNICOS5) */ *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 defined(CRAY2) && defined(UNICOS5) /* * If chars were left over from the terminal driver, * note their existence. */ if (!uselinemode && unpcc) { pcc = unpcc; unpcc = 0; ptyip = unptyip; } #endif /* defined(CRAY2) && defined(UNICOS5) */ 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 */ } doeof() { #if defined(USE_TERMIO) && defined(SYSV_TERMIO) extern char oldeofc; #endif init_termbuf(); #if defined(USE_TERMIO) && defined(SYSV_TERMIO) if (!tty_isediting()) { *pfrontp++ = oldeofc; return; } #endif *pfrontp++ = slctab[SLC_EOF].sptr ? (unsigned char)*slctab[SLC_EOF].sptr : '\004'; }