X-Git-Url: https://git.subgeniuskitty.com/unix-history/.git/blobdiff_plain/dedc39658a70fa276ae5b27b113ef11e423f78c5..ad7871609881e73855d0b04da49b486cd93efca7:/usr/src/libexec/telnetd/telnetd.c diff --git a/usr/src/libexec/telnetd/telnetd.c b/usr/src/libexec/telnetd/telnetd.c index dc5111c4a1..1649a7cbbb 100644 --- a/usr/src/libexec/telnetd/telnetd.c +++ b/usr/src/libexec/telnetd/telnetd.c @@ -1,142 +1,406 @@ /* - * Copyright (c) 1983, 1986 Regents of the University of California. - * All rights reserved. + * Copyright (c) 1989, 1993 + * The 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. + * 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. */ #ifndef lint -char copyright[] = -"@(#) Copyright (c) 1983, 1986 Regents of the University of California.\n\ - All rights reserved.\n"; +static char copyright[] = +"@(#) Copyright (c) 1989, 1993\n\ + The Regents of the University of California. All rights reserved.\n"; #endif /* not lint */ #ifndef lint -static char sccsid[] = "@(#)telnetd.c 5.35 (Berkeley) %G%"; +static char sccsid[] = "@(#)telnetd.c 8.1 (Berkeley) 6/4/93"; #endif /* not lint */ +#include "telnetd.h" +#include "pathnames.h" + +#if defined(_SC_CRAY_SECURE_SYS) && !defined(SCM_SECURITY) /* - * Telnet server. + * UNICOS 6.0/6.1 do not have SCM_SECURITY defined, so we can + * use it to tell us to turn off all the socket security code, + * since that is only used in UNICOS 7.0 and later. */ -#include -#include -#include -#include -#include -#include - -#include - -#include - -#include -#include -#include -#include -#include -#include -#include - -#define OPT_NO 0 /* won't do this option */ -#define OPT_YES 1 /* will do this option */ -#define OPT_YES_BUT_ALWAYS_LOOK 2 -#define OPT_NO_BUT_ALWAYS_LOOK 3 -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 }; +# undef _SC_CRAY_SECURE_SYS +#endif + +#if defined(_SC_CRAY_SECURE_SYS) +#include +#include +# ifdef SO_SEC_MULTI /* 8.0 code */ +#include +#include +# endif /* SO_SEC_MULTI */ +int secflag; +char tty_dev[16]; +struct secdev dv; +struct sysv sysv; +# ifdef SO_SEC_MULTI /* 8.0 code */ +struct socksec ss; +# else /* SO_SEC_MULTI */ /* 7.0 code */ +struct socket_security ss; +# endif /* SO_SEC_MULTI */ +#endif /* _SC_CRAY_SECURE_SYS */ + +#if defined(AUTHENTICATION) +#include +int auth_level = 0; +#endif +#if defined(SecurID) +int require_SecurID = 0; +#endif + +extern int utmp_len; +int registerd_host_only = 0; + +#ifdef STREAMSPTY +# include +# include +/* make sure we don't get the bsd version */ +# include "/usr/include/sys/tty.h" +# include /* - * I/O data buffers, pointers, and counters. + * Because of the way ptyibuf is used with streams messages, we need + * ptyibuf+1 to be on a full-word boundary. The following wierdness + * is simply to make that happen. */ -char ptyibuf[BUFSIZ], *ptyip = ptyibuf; +char ptyibufbuf[BUFSIZ+4]; +char *ptyibuf = ptyibufbuf+3; +char *ptyip = ptyibufbuf+3; +char ptyibuf2[BUFSIZ]; +unsigned char ctlbuf[BUFSIZ]; +struct strbuf strbufc, strbufd; -char ptyobuf[BUFSIZ], *pfrontp = ptyobuf, *pbackp = ptyobuf; +int readstream(); -char netibuf[BUFSIZ], *netip = netibuf; -#define NIACCUM(c) { *netip++ = c; \ - ncc++; \ - } +#else /* ! STREAMPTY */ -char netobuf[BUFSIZ], *nfrontp = netobuf, *nbackp = netobuf; -char *neturg = 0; /* one past last bye of urgent data */ - /* the remote system seems to NOT be an old 4.2 */ -int not42 = 1; +/* + * I/O data buffers, + * pointers, and counters. + */ +char ptyibuf[BUFSIZ], *ptyip = ptyibuf; +char ptyibuf2[BUFSIZ]; -#define BANNER "\r\n\r\n4.3 BSD UNIX (%s)\r\n\r\r\n\r" +#endif /* ! STREAMPTY */ - /* buffer for sub-options */ -char subbuffer[100], *subpointer= subbuffer, *subend= subbuffer; -#define SB_CLEAR() subpointer = subbuffer; -#define SB_TERM() { subend = subpointer; SB_CLEAR(); } -#define SB_ACCUM(c) if (subpointer < (subbuffer+sizeof subbuffer)) { \ - *subpointer++ = (c); \ - } -#define SB_GET() ((*subpointer++)&0xff) -#define SB_EOF() (subpointer >= subend) +int hostinfo = 1; /* do we print login banner? */ -int pcc, ncc; +#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; +int keepalive = 1; +char *progname; + +extern void usage P((void)); -int pty, net; -int inter; -extern char **environ; -extern int errno; -char *line; -int SYNCHing = 0; /* we are in TELNET SYNCH mode */ /* - * The following are some clocks used to decide how to interpret - * the relationship between various variables. + * The string to pass to getopt(). We do it this way so + * that only the actual options that we support will be + * passed off to getopt(). */ +char valid_opts[] = { + 'd', ':', 'h', 'k', 'n', 'S', ':', 'u', ':', 'U', +#ifdef AUTHENTICATION + 'a', ':', 'X', ':', +#endif +#ifdef BFTPDAEMON + 'B', +#endif +#ifdef DIAGNOSTICS + 'D', ':', +#endif +#ifdef ENCRYPTION + 'e', ':', +#endif +#if defined(CRAY) && defined(NEWINIT) + 'I', ':', +#endif +#ifdef LINEMODE + 'l', +#endif +#ifdef CRAY + 'r', ':', +#endif +#ifdef SecurID + 's', +#endif + '\0' +}; -struct { - int - system, /* what the current time is */ - echotoggle, /* last time user entered echo character */ - modenegotiated, /* last time operating mode negotiated */ - didnetreceive, /* last time we read data from network */ - ttypeopt, /* ttype will/won't received */ - ttypesubopt, /* ttype subopt is received */ - getterminal, /* time started to get terminal information */ - gotDM; /* when did we last see a data mark */ -} clocks; - -#define settimer(x) (clocks.x = ++clocks.system) -#define sequenceIs(x,y) (clocks.x < clocks.y) - main(argc, argv) char *argv[]; { struct sockaddr_in from; int on = 1, fromlen; + register int ch; + extern char *optarg; + extern int optind; +#if defined(IPPROTO_IP) && defined(IP_TOS) + int tos = -1; +#endif + + pfrontp = pbackp = ptyobuf; + netip = netibuf; + nfrontp = nbackp = netobuf; +#ifdef ENCRYPTION + nclearto = 0; +#endif /* ENCRYPTION */ + + progname = *argv; + +#ifdef CRAY + /* + * Get number of pty's before trying to process options, + * which may include changing pty range. + */ + highpty = getnpty(); +#endif /* CRAY */ + + while ((ch = getopt(argc, argv, valid_opts)) != EOF) { + switch(ch) { + +#ifdef AUTHENTICATION + 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 /* AUTHENTICATION */ + +#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 ENCRYPTION + case 'e': + if (strcmp(optarg, "debug") == 0) { + extern int encrypt_debug_mode; + encrypt_debug_mode = 1; + break; + } + usage(); + /* NOTREACHED */ + break; +#endif /* ENCRYPTION */ + + case 'h': + hostinfo = 0; + break; + +#if defined(CRAY) && defined(NEWINIT) + case 'I': + { + extern char *gen_id; + gen_id = optarg; + break; + } +#endif /* defined(CRAY) && defined(NEWINIT) */ + +#ifdef LINEMODE + case 'l': + alwayslinemode = 1; + break; +#endif /* LINEMODE */ + + case 'k': +#if defined(LINEMODE) && defined(KLUDGELINEMODE) + lmodetype = NO_AUTOKLUDGE; +#else + /* ignore -k option if built without kludge linemode */ +#endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ + break; + + case 'n': + keepalive = 0; + break; + +#ifdef CRAY + case 'r': + { + 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. + */ + c = strchr(optarg, '-'); + if (c) { + *c++ = '\0'; + highpty = atoi(c); + } + if (*optarg != '\0') + lowpty = atoi(optarg); + if ((lowpty > highpty) || (lowpty < 0) || + (highpty > 32767)) { + usage(); + /* NOT REACHED */ + } + break; + } +#endif /* CRAY */ + +#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; + + case 'u': + utmp_len = atoi(optarg); + break; + + case 'U': + registerd_host_only = 1; + break; + +#ifdef AUTHENTICATION + case 'X': + /* + * Check for invalid authentication types + */ + auth_disable_name(optarg); + break; +#endif /* AUTHENTICATION */ + + default: + fprintf(stderr, "telnetd: %c: unknown option\n", ch); + /* FALLTHROUGH */ + case '?': + usage(); + /* NOTREACHED */ + } + } + + argc -= optind; + argv += optind; - if ((argc > 1) && (strcmp(argv[1], "-debug") == 0)) { + if (debug) { int s, ns, foo; struct servent *sp; static struct sockaddr_in sin = { AF_INET }; - argc--, argv++; if (argc > 1) { - sin.sin_port = atoi(argv[1]); - sin.sin_port = htons((u_short)sin.sin_port); + 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); + fprintf(stderr, "telnetd: tcp/telnet: unknown service\n"); + exit(1); } sin.sin_port = sp->s_port; } @@ -146,7 +410,9 @@ main(argc, argv) perror("telnetd: socket");; exit(1); } - if (bind(s, &sin, sizeof sin) < 0) { + (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, + (char *)&on, sizeof(on)); + if (bind(s, (struct sockaddr *)&sin, sizeof sin) < 0) { perror("bind"); exit(1); } @@ -155,270 +421,486 @@ main(argc, argv) exit(1); } foo = sizeof sin; - ns = accept(s, &sin, &foo); + ns = accept(s, (struct sockaddr *)&sin, &foo); if (ns < 0) { perror("accept"); exit(1); } - dup2(ns, 0); - close(s); + (void) dup2(ns, 0); + (void) close(ns); + (void) close(s); +#ifdef convex + } else if (argc == 1) { + ; /* VOID*/ /* Just ignore the host/port name */ +#endif + } else if (argc > 0) { + usage(); + /* NOT REACHED */ + } + +#if defined(_SC_CRAY_SECURE_SYS) + secflag = sysconf(_SC_CRAY_SECURE_SYS); + + /* + * Get socket's security label + */ + if (secflag) { + int szss = sizeof(ss); +#ifdef SO_SEC_MULTI /* 8.0 code */ + int sock_multi; + int szi = sizeof(int); +#endif /* SO_SEC_MULTI */ + + bzero((char *)&dv, sizeof(dv)); + + if (getsysv(&sysv, sizeof(struct sysv)) != 0) { + perror("getsysv"); + exit(1); + } + + /* + * Get socket security label and set device values + * {security label to be set on ttyp device} + */ +#ifdef SO_SEC_MULTI /* 8.0 code */ + if ((getsockopt(0, SOL_SOCKET, SO_SECURITY, + (char *)&ss, &szss) < 0) || + (getsockopt(0, SOL_SOCKET, SO_SEC_MULTI, + (char *)&sock_multi, &szi) < 0)) { + perror("getsockopt"); + exit(1); + } else { + dv.dv_actlvl = ss.ss_actlabel.lt_level; + dv.dv_actcmp = ss.ss_actlabel.lt_compart; + if (!sock_multi) { + dv.dv_minlvl = dv.dv_maxlvl = dv.dv_actlvl; + dv.dv_valcmp = dv.dv_actcmp; + } else { + dv.dv_minlvl = ss.ss_minlabel.lt_level; + dv.dv_maxlvl = ss.ss_maxlabel.lt_level; + dv.dv_valcmp = ss.ss_maxlabel.lt_compart; + } + dv.dv_devflg = 0; + } +#else /* SO_SEC_MULTI */ /* 7.0 code */ + if (getsockopt(0, SOL_SOCKET, SO_SECURITY, + (char *)&ss, &szss) >= 0) { + dv.dv_actlvl = ss.ss_slevel; + dv.dv_actcmp = ss.ss_compart; + dv.dv_minlvl = ss.ss_minlvl; + dv.dv_maxlvl = ss.ss_maxlvl; + dv.dv_valcmp = ss.ss_maxcmp; + } +#endif /* SO_SEC_MULTI */ } +#endif /* _SC_CRAY_SECURE_SYS */ + 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) { + if (keepalive && + setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, + (char *)&on, sizeof (on)) < 0) { syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); } - doit(0, &from); -} - -char *terminaltype = 0; -char *envinit[2]; -int cleanup(); - -/* - * ttloop - * - * A small subroutine to flush the network output buffer, get some data - * from the network, and pass it through the telnet state machine. We - * also flush the pty input buffer (by dropping its data) if it becomes - * too full. - */ -void -ttloop() +#if defined(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, + (char *)&tos, sizeof(tos)) < 0) + && (errno != ENOPROTOOPT) ) + syslog(LOG_WARNING, "setsockopt (IP_TOS): %m"); + } +#endif /* defined(IPPROTO_IP) && defined(IP_TOS) */ + net = 0; + doit(&from); + /* NOTREACHED */ +} /* end of main */ + + void +usage() { - if (nfrontp-nbackp) { - netflush(); - } - ncc = read(net, netibuf, sizeof netibuf); - if (ncc < 0) { - syslog(LOG_INFO, "ttloop: read: %m\n"); + fprintf(stderr, "Usage: telnetd"); +#ifdef AUTHENTICATION + fprintf(stderr, " [-a (debug|other|user|valid|off|none)]\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 AUTHENTICATION + fprintf(stderr, " [-edebug]"); +#endif + fprintf(stderr, " [-h]"); +#if defined(CRAY) && defined(NEWINIT) + fprintf(stderr, " [-Iinitid]"); +#endif +#if defined(LINEMODE) && defined(KLUDGELINEMODE) + fprintf(stderr, " [-k]"); +#endif +#ifdef LINEMODE + fprintf(stderr, " [-l]"); +#endif + fprintf(stderr, " [-n]"); +#ifdef CRAY + fprintf(stderr, " [-r[lowpty]-[highpty]]"); +#endif + fprintf(stderr, "\n\t"); +#ifdef SecurID + fprintf(stderr, " [-s]"); +#endif +#ifdef HAS_GETTOS + fprintf(stderr, " [-S tos]"); +#endif +#ifdef AUTHENTICATION + fprintf(stderr, " [-X auth-type]"); +#endif + fprintf(stderr, " [-u utmp_hostname_length] [-U]"); + fprintf(stderr, " [port]\n"); exit(1); - } else if (ncc == 0) { - syslog(LOG_INFO, "ttloop: peer died: %m\n"); - exit(1); - } - netip = netibuf; - telrcv(); /* state machine */ - if (ncc > 0) { - pfrontp = pbackp = ptyobuf; - telrcv(); - } -} - -/* - * getterminalspeed - * - * Ask the other end to send along its terminal speed. - * subopt does the rest. - */ - -void -getterminalspeed() -{ - static char sbuf[] = { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; - - bcopy(sbuf, nfrontp, sizeof sbuf); - nfrontp += sizeof sbuf; } /* * getterminaltype * - * Ask the other end to send along its terminal type. + * 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() + int +getterminaltype(name) + char *name; { - static char sbuf[] = { IAC, DO, TELOPT_TTYPE }; - - settimer(getterminal); - bcopy(sbuf, nfrontp, sizeof sbuf); - nfrontp += sizeof sbuf; - hisopts[TELOPT_TTYPE] = OPT_YES_BUT_ALWAYS_LOOK; - while (sequenceIs(ttypeopt, getterminal)) { + int retval = -1; + void _gettermname(); + + settimer(baseline); +#if defined(AUTHENTICATION) + /* + * 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 + +#ifdef ENCRYPTION + send_will(TELOPT_ENCRYPT, 1); +#endif /* ENCRYPTION */ + send_do(TELOPT_TTYPE, 1); + send_do(TELOPT_TSPEED, 1); + send_do(TELOPT_XDISPLOC, 1); + send_do(TELOPT_ENVIRON, 1); + while ( +#ifdef ENCRYPTION + his_do_dont_is_changing(TELOPT_ENCRYPT) || +#endif /* ENCRYPTION */ + 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 (hisopts[TELOPT_TTYPE] == OPT_YES) { - static char sbbuf[] = { IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE }; +#ifdef ENCRYPTION + /* + * 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 /* ENCRYPTION */ + 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; - while (sequenceIs(ttypesubopt, getterminal)) { + } + 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; + } + } } } + return(retval); +} /* end of getterminaltype */ + + void +_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(); +} + + int +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); } +#ifndef MAXHOSTNAMELEN +#define MAXHOSTNAMELEN 64 +#endif /* MAXHOSTNAMELEN */ + +char *hostname; +char host_name[MAXHOSTNAMELEN]; +char remote_host_name[MAXHOSTNAMELEN]; + +#ifndef convex +extern void telnet P((int, int)); +#else +extern void telnet P((int, int, char *)); +#endif + /* * 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; - int c; + int level; + int ptynum; + char user_name[256]; + + /* + * Find an available pty to use. + */ +#ifndef convex + pty = getpty(&ptynum); + if (pty < 0) + fatal(net, "All network ports in use"); +#else + for (;;) { + char *lp; + extern char *line, *getpty(); - for (c = 'p'; c <= 's'; c++) { - struct stat stb; + if ((lp = getpty()) == NULL) + fatal(net, "Out of ptys"); - line = "/dev/ptyXX"; - line[strlen("/dev/pty")] = c; - line[strlen("/dev/ptyp")] = '0'; - if (stat(line, &stb) < 0) + if ((pty = open(lp, 2)) >= 0) { + strcpy(line,lp); + line[5] = 't'; break; - for (i = 0; i < 16; i++) { - line[sizeof("/dev/ptyp") - 1] = "0123456789abcdef"[i]; - p = open(line, O_RDWR); - 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); +#endif + +#if defined(_SC_CRAY_SECURE_SYS) + /* + * set ttyp line security label + */ + if (secflag) { + char slave_dev[16]; + + sprintf(tty_dev, "/dev/pty/%03d", ptynum); + if (setdevs(tty_dev, &dv) < 0) + fatal(net, "cannot set pty security"); + sprintf(slave_dev, "/dev/ttyp%03d", ptynum); + if (setdevs(slave_dev, &dv) < 0) + fatal(net, "cannot set tty security"); } - t = open(line, O_RDWR); - if (t < 0) - fatalperror(f, line); - if (fchmod(t, 0)) - fatalperror(f, line); - (void)signal(SIGHUP, SIG_IGN); - vhangup(); - (void)signal(SIGHUP, SIG_DFL); - t = open(line, O_RDWR); - if (t < 0) - fatalperror(f, line); - ioctl(t, TIOCGETP, &b); - b.sg_flags = CRMOD|XTABS|ANYP; - ioctl(t, TIOCSETP, &b); - ioctl(p, TIOCGETP, &b); - b.sg_flags &= ~ECHO; - b.sg_ospeed = b.sg_ispeed = B9600; - ioctl(p, TIOCSETP, &b); - hp = gethostbyaddr(&who->sin_addr, sizeof (struct in_addr), +#endif /* _SC_CRAY_SECURE_SYS */ + + /* get name of connected client */ + hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr), who->sin_family); - if (hp) + + if (hp == NULL && registerd_host_only) { + fatal(net, "Couldn't resolve your address into a host name.\r\n\ + Please contact your net administrator"); + } else if (hp && + (strlen(hp->h_name) <= ((utmp_len < 0) ? -utmp_len : utmp_len))) { host = hp->h_name; - else + } 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... + */ + strncpy(remote_host_name, host, sizeof(remote_host_name)-1); + remote_host_name[sizeof(remote_host_name)-1] = 0; + host = remote_host_name; + + (void) gethostname(host_name, sizeof (host_name)); + hostname = host_name; - net = f; - pty = p; +#if defined(AUTHENTICATION) || defined(ENCRYPTION) + auth_encrypt_init(hostname, host, "TELNETD", 1); +#endif + init_env(); /* - * get terminal type and size. + * get terminal type. */ - getterminaltype(); + *user_name = 0; + level = getterminaltype(user_name); + setenv("TERM", terminaltype ? terminaltype : "network", 1); - if ((i = fork()) < 0) - fatalperror(f, "fork"); - if (i) { - close(t); - telnet(f, p); - } - if (setsid() < 0) - fatalperror(f, "setsid"); - if (ioctl(t, TIOCSCTTY, 0) < 0) - fatalperror(f, "ioctl(sctty)"); - close(f); - close(p); - dup2(t, 0); - dup2(t, 1); - dup2(t, 2); - close(t); - envinit[0] = terminaltype; - envinit[1] = 0; - environ = envinit; /* - * -h : pass on name of host. - * WARNING: -h is accepted by login if and only if - * getuid() == 0. - * -p : don't clobber the environment (so terminal type stays set). + * Start up the login process on the slave side of the terminal */ - execl("/bin/login", "login", "-h", host, - terminaltype ? "-p" : 0, 0); - syslog(LOG_ERR, "/bin/login: %m\n"); - fatalperror(2, "/bin/login"); - /*NOTREACHED*/ -} - -fatal(f, msg) - int f; - char *msg; -{ - char buf[BUFSIZ]; +#ifndef convex + startslave(host, level, user_name); + +#if defined(_SC_CRAY_SECURE_SYS) + if (secflag) { + if (setulvl(dv.dv_actlvl) < 0) + fatal(net,"cannot setulvl()"); + if (setucmp(dv.dv_actcmp) < 0) + fatal(net, "cannot setucmp()"); + } +#endif /* _SC_CRAY_SECURE_SYS */ - (void) sprintf(buf, "telnetd: %s.\r\n", msg); - (void) write(f, buf, strlen(buf)); - exit(1); -} + telnet(net, pty); /* begin server processing */ +#else + telnet(net, pty, host); +#endif + /*NOTREACHED*/ +} /* end of doit */ -fatalperror(f, msg) - int f; - char *msg; +#if defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) + int +Xterm_output(ibufp, obuf, icountp, ocount) + char **ibufp, *obuf; + int *icountp, ocount; { - char buf[BUFSIZ]; - extern char *sys_errlist[]; - - (void) sprintf(buf, "%s: %s\r\n", msg, sys_errlist[errno]); - fatal(f, buf); + int ret; + ret = term_output(*ibufp, obuf, *icountp, ocount); + *ibufp += *icountp; + *icountp = 0; + return(ret); } +#define term_output Xterm_output +#endif /* defined(CRAY2) && defined(UNICOS5) && defined(UNICOS50) */ - -/* - * Check a descriptor to see if out of band data exists on it. - */ - - -stilloob(s) -int s; /* socket number */ -{ - static struct timeval timeout = { 0 }; - fd_set excepts; - int value; - - do { - FD_ZERO(&excepts); - FD_SET(s, &excepts); - value = select(s+1, (fd_set *)0, (fd_set *)0, &excepts, &timeout); - } while ((value == -1) && (errno == EINTR)); - - if (value < 0) { - fatalperror(pty, "select"); - } - if (FD_ISSET(s, &excepts)) { - return 1; - } else { - return 0; - } -} - /* * Main loop. Select from pty and network, and * hand data to telnet receiver finite state machine. */ + void +#ifndef convex telnet(f, p) +#else +telnet(f, p, host) +#endif + int f, p; +#ifdef convex + char *host; +#endif { int on = 1; - char hostname[MAXHOSTNAMELEN]; #define TABBUFSIZ 512 char defent[TABBUFSIZ]; char defstrs[TABBUFSIZ]; @@ -426,44 +908,20 @@ telnet(f, p) char *HE; char *HN; char *IM; + void netflush(); - ioctl(f, FIONBIO, &on); - ioctl(p, FIONBIO, &on); - ioctl(p, TIOCPKT, &on); -#if defined(SO_OOBINLINE) - setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on); -#endif /* defined(SO_OOBINLINE) */ - signal(SIGTSTP, SIG_IGN); /* - * Ignoring SIGTTOU keeps the kernel from blocking us - * in ttioctl() in /sys/tty.c. + * Initialize the slc mapping table. */ - signal(SIGTTOU, SIG_IGN); - signal(SIGCHLD, cleanup); - setpgrp(0, 0); + get_slc_defaults(); /* - * Request to do remote echo and to suppress go ahead. + * 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_ECHO]) { - dooption(TELOPT_ECHO); - } - if (!myopts[TELOPT_SGA]) { - dooption(TELOPT_SGA); - } - if (!hisopts[TELOPT_NAWS]) { - willoption(TELOPT_NAWS); - hisopts[TELOPT_NAWS] = OPT_NO; - } - if (!hisopts[TELOPT_TSPEED]) { - willoption(TELOPT_TSPEED); - hisopts[TELOPT_TSPEED] = OPT_NO; - } - if (!hisopts[TELOPT_LFLOW]) { - willoption(TELOPT_LFLOW); - hisopts[TELOPT_LFLOW] = OPT_NO; - } - + 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. @@ -474,75 +932,243 @@ telnet(f, p) * WE, the server, sends it; it does NOT mean that the client will * echo the terminal input). */ - (void) sprintf(nfrontp, doopt, TELOPT_ECHO); - nfrontp += sizeof doopt-2; - hisopts[TELOPT_ECHO] = OPT_YES_BUT_ALWAYS_LOOK; + 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 */ /* - * 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. + * 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 */ + restartany = -1; /* uninitialized... */ + send_do(TELOPT_LFLOW, 1); - gethostname(hostname, sizeof (hostname)); - if (getent(defent, "default") == 1) { - char *getstr(); - char *p=defstrs; + /* + * 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(); - HE = getstr("he", &p); - HN = getstr("hn", &p); - IM = getstr("im", &p); - if (HN && *HN) - strcpy(hostname, HN); - edithost(HE, hostname); - if (IM && *IM) - putf(IM, ptyibuf+1); - } else { - sprintf(ptyibuf+1, BANNER, hostname); + /* + * 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, + {sprintf(nfrontp, "td: simulating recv\r\n"); + nfrontp += strlen(nfrontp);}); + willoption(TELOPT_ECHO); } - ptyip = ptyibuf+1; /* Prime the pump */ - pcc = strlen(ptyip); /* ditto */ + /* + * 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); - /* Clear ptybuf[0] - where the packet information is received */ - ptyibuf[0] = 0; +#ifndef STREAMSPTY + /* + * Turn on packet mode + */ + (void) ioctl(p, TIOCPKT, (char *)&on); +#endif + +#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. + * terminal type negotiation, 4.2/4.3 determination, and + * linemode negotiation. */ telrcv(); - for (;;) { - fd_set ibits, obits, xbits; - register int c; + (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 (ncc < 0 && pcc < 0) - break; +#if defined(SO_OOBINLINE) + (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, + (char *)&on, sizeof on); +#endif /* defined(SO_OOBINLINE) */ - 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); +#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 TIOCNOTTY + { + register int t; + t = open(_PATH_TTY, O_RDWR); + if (t >= 0) { + (void) ioctl(t, TIOCNOTTY, (char *)0); + (void) close(t); + } + } +#endif + +#if defined(CRAY) && defined(NEWINIT) && defined(TIOCSCTTY) + (void) setsid(); + 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. + */ + +#if !defined(CRAY) || !defined(NEWINIT) + if (getenv("USER")) + hostinfo = 0; +#endif + + 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(host_name, HN); + if (IM == 0) + IM = ""; + } else { + IM = DEFAULT_IM; + HE = 0; + } + edithost(HE, host_name); + if (hostinfo && *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 */ + + DIAG(TD_REPORT, + {sprintf(nfrontp, "td: Entering processing loop\r\n"); + nfrontp += strlen(nfrontp);}); + +#ifdef convex + startslave(host); +#endif + + 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); } - FD_SET(p, &xbits); if ((c = select(16, &ibits, &obits, &xbits, (struct timeval *)0)) < 1) { if (c == -1) { @@ -603,7 +1229,7 @@ telnet(f, p) if (SYNCHing) { int atmark; - ioctl(net, SIOCATMARK, (char *)&atmark); + (void) ioctl(net, SIOCATMARK, (char *)&atmark); if (atmark) { ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB); if ((ncc == -1) && (errno == EINVAL)) { @@ -630,36 +1256,89 @@ telnet(f, p) } netip = netibuf; } + DIAG((TD_REPORT | TD_NETDATA), + {sprintf(nfrontp, "td: netread %d chars\r\n", ncc); + nfrontp += strlen(nfrontp);}); + DIAG(TD_NETDATA, printdata("nd", netip, ncc)); } /* * Something to read from the pty... */ - if (FD_ISSET(p, &ibits) || FD_ISSET(p, &xbits)) { + if (FD_ISSET(p, &ibits)) { +#ifndef STREAMSPTY pcc = read(p, ptyibuf, BUFSIZ); - if (pcc < 0 && errno == EWOULDBLOCK) +#else + pcc = readstream(p, ptyibuf, BUFSIZ); +#endif + /* + * 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 || +#ifdef EAGAIN + errno == EAGAIN || +#endif + errno == EIO)) { pcc = 0; - else { + } 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 */ + 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 (hisopts[TELOPT_LFLOW] && + if (his_state_is_will(TELOPT_LFLOW) && (ptyibuf[0] & - (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { - sprintf(nfrontp,"%c%c%c%c%c%c", - IAC, SB, TELOPT_LFLOW, - ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0, - IAC, SE); - nfrontp += 6; + (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { + int newflow = + ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0; + if (newflow != flowmode) { + flowmode = newflow; + (void) sprintf(nfrontp, + "%c%c%c%c%c%c", + IAC, SB, TELOPT_LFLOW, + flowmode ? LFLOW_ON + : LFLOW_OFF, + 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) { @@ -668,9 +1347,13 @@ telnet(f, p) 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; - /* Don't do CR-NUL if we are in binary mode */ - if ((c == '\r') && (myopts[TELOPT_BINARY] == OPT_NO)) { + if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) { if (pcc > 0 && ((*ptyip & 0377) == '\n')) { *nfrontp++ = *ptyip++ & 0377; pcc--; @@ -678,6 +1361,18 @@ telnet(f, p) *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) @@ -685,539 +1380,122 @@ telnet(f, p) if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) ptyflush(); } - cleanup(); -} + cleanup(0); +} /* 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_SB 3 /* throw away begin's... */ -#define TS_SE 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; - - while (ncc > 0) { - if ((&ptyobuf[BUFSIZ] - pfrontp) < 2) - return; - c = *netip++ & 0377, ncc--; - switch (state) { - - case TS_CR: - state = TS_DATA; - /* Strip off \n or \0 after a \r */ - if ((c == 0) || (c == '\n')) { - break; - } - /* FALL THROUGH */ - - case TS_DATA: - if (c == IAC) { - state = TS_IAC; - break; - } - if (inter > 0) - break; - /* - * We now map \r\n ==> \r for pragmatic reasons. - * Many client implementations send \r\n when - * the user hits the CarriageReturn key. - * - * We USED to map \r\n ==> \n, since \r\n says - * that we want to be in column 1 of the next - * printable line, and \n is the standard - * unix way of saying that (\r is only good - * if CRMOD is set, which it normally is). - */ - if ((c == '\r') && (hisopts[TELOPT_BINARY] == OPT_NO)) { - state = TS_CR; - } - *pfrontp++ = c; - 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 IP: - interrupt(); - break; - - case BREAK: - sendbrk(); - break; - - /* - * Are You There? - */ - case AYT: - strcpy(nfrontp, "\r\n[Yes]\r\n"); - nfrontp += 9; - break; - - /* - * Abort Output - */ - case AO: { - struct ltchars tmpltc; - - ptyflush(); /* half-hearted */ - ioctl(pty, TIOCGLTC, &tmpltc); - if (tmpltc.t_flushc != '\377') { - *pfrontp++ = tmpltc.t_flushc; - } - netclear(); /* clear buffer back */ - *nfrontp++ = IAC; - *nfrontp++ = DM; - neturg = nfrontp-1; /* off by one XXX */ - break; - } +#ifndef TCSIG +# ifdef TIOCSIG +# define TCSIG TIOCSIG +# endif +#endif - /* - * Erase Character and - * Erase Line - */ - case EC: - case EL: { - struct sgttyb b; - char ch; - - ptyflush(); /* half-hearted */ - ioctl(pty, TIOCGETP, &b); - ch = (c == EC) ? - b.sg_erase : b.sg_kill; - if (ch != '\377') { - *pfrontp++ = ch; - } - break; - } +#ifdef STREAMSPTY - /* - * Check for urgent data... - */ - case DM: - SYNCHing = stilloob(net); - settimer(gotDM); - break; +int flowison = -1; /* current state of flow: -1 is unknown */ - - /* - * Begin option subnegotiation... - */ - case SB: - state = TS_SB; - SB_CLEAR(); - continue; - - case WILL: - state = TS_WILL; - continue; - - case WONT: - state = TS_WONT; - continue; - - case DO: - state = TS_DO; - continue; - - case DONT: - state = TS_DONT; - continue; - - case IAC: - *pfrontp++ = c; - break; - } - state = TS_DATA; - break; - - case TS_SB: - if (c == IAC) { - state = TS_SE; - } else { - SB_ACCUM(c); - } - break; - - case TS_SE: - if (c != SE) { - if (c != IAC) { - SB_ACCUM(IAC); - } - SB_ACCUM(c); - state = TS_SB; - } else { - SB_TERM(); - suboption(); /* handle sub-option */ - state = TS_DATA; - } - break; - - case TS_WILL: - if (hisopts[c] != OPT_YES) - willoption(c); - state = TS_DATA; - if (c == TELOPT_TSPEED) - getterminalspeed(); - continue; - - case TS_WONT: - if (hisopts[c] != OPT_NO) - wontoption(c); - state = TS_DATA; - continue; - - case TS_DO: - if (myopts[c] != OPT_YES) - dooption(c); - state = TS_DATA; - continue; - - case TS_DONT: - if (myopts[c] != OPT_NO) { - dontoption(c); - } - state = TS_DATA; - continue; - - default: - syslog(LOG_ERR, "telnetd: panic state=%d\n", state); - printf("telnetd: panic state=%d\n", state); - exit(1); - } - } -} - -willoption(option) - int option; +int readstream(p, ibuf, bufsize) + int p; + char *ibuf; + int bufsize; { - char *fmt; - - switch (option) { - - case TELOPT_BINARY: - mode(RAW, 0); - fmt = doopt; - break; - - case TELOPT_ECHO: - not42 = 0; /* looks like a 4.2 system */ - /* - * Now, in a 4.2 system, to break them out of ECHOing - * (to the terminal) mode, we need to send a "WILL ECHO". - * Kludge upon kludge! - */ - if (myopts[TELOPT_ECHO] == OPT_YES) { - dooption(TELOPT_ECHO); - } - fmt = dont; - break; - - case TELOPT_TTYPE: - settimer(ttypeopt); - if (hisopts[TELOPT_TTYPE] == OPT_YES_BUT_ALWAYS_LOOK) { - hisopts[TELOPT_TTYPE] = OPT_YES; - return; + int flags = 0; + int ret = 0; + struct termios *tsp; + struct termio *tp; + struct iocblk *ip; + char vstop, vstart; + int ixon; + int newflow; + + strbufc.maxlen = BUFSIZ; + strbufc.buf = ctlbuf; + strbufd.maxlen = bufsize-1; + strbufd.len = 0; + strbufd.buf = ibuf+1; + ibuf[0] = 0; + + ret = getmsg(p, &strbufc, &strbufd, &flags); + if (ret < 0) /* error of some sort -- probably EAGAIN */ + return(-1); + + if (strbufc.len <= 0 || ctlbuf[0] == M_DATA) { + /* data message */ + if (strbufd.len > 0) { /* real data */ + return(strbufd.len + 1); /* count header char */ + } else { + /* nothing there */ + errno = EAGAIN; + return(-1); } - fmt = doopt; - break; - - case TELOPT_NAWS: - case TELOPT_TSPEED: - case TELOPT_LFLOW: - case TELOPT_SGA: - fmt = doopt; - break; - - case TELOPT_TM: - fmt = dont; - break; - - default: - fmt = dont; - break; } - if (fmt == doopt) { - hisopts[option] = OPT_YES; - } else { - hisopts[option] = OPT_NO; - } - (void) sprintf(nfrontp, fmt, option); - nfrontp += sizeof (dont) - 2; -} -wontoption(option) - int option; -{ - char *fmt; - - switch (option) { - case TELOPT_ECHO: - not42 = 1; /* doesn't seem to be a 4.2 system */ - break; - - case TELOPT_BINARY: - mode(0, RAW); - break; - - case TELOPT_TTYPE: - settimer(ttypeopt); - break; - } - - fmt = dont; - hisopts[option] = OPT_NO; - (void) 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); - fmt = will; - break; - - case TELOPT_BINARY: - mode(RAW, 0); - fmt = will; - break; - - case TELOPT_SGA: - fmt = will; - break; - - default: - fmt = wont; - break; - } - if (fmt == will) { - myopts[option] = OPT_YES; - } else { - myopts[option] = OPT_NO; - } - (void) sprintf(nfrontp, fmt, option); - nfrontp += sizeof (doopt) - 2; -} - - -dontoption(option) -int option; -{ - char *fmt; - - switch (option) { - case TELOPT_ECHO: /* we should stop echoing */ - mode(0, ECHO); - fmt = wont; - break; - - default: - fmt = wont; - break; - } - - if (fmt = wont) { - myopts[option] = OPT_NO; - } else { - myopts[option] = OPT_YES; - } - (void) sprintf(nfrontp, fmt, option); - nfrontp += sizeof (wont) - 2; -} - -/* - * Given a string, assign the "best" speed which we support. - * - * "Best" is defined as rounding up, unless what is presented is - * higher than the highest. - */ - -string2speed(s) - char *s; -{ /* - * The order here is important. The index of each speed needs to - * correspond with the sgtty structure value for that speed. - * - * Additionally, the search algorithm assumes the table is in - * ascending sequence. + * It's a control message. Return 1, to look at the flag we set */ - static int ttyspeeds[] = { - 0, 50, 75, 110, 134, 150, 200, 300, - 600, 1200, 1800, 2400, 4800, 9600, 19200, 38400 }; -#define NUMSPEEDS sizeof ttyspeeds/sizeof ttyspeeds[0] - int i; - int theirspeed = atoi(s); - - for (i = 0; i < NUMSPEEDS; i++) { - if (ttyspeeds[i] == theirspeed) { /* Exact match */ - return(i); - } else if (ttyspeeds[i] > theirspeed) { - if (i > 0) { - return i-1; - } - } - } - /* Their number is greater than any of our numbers */ - return(NUMSPEEDS-1); -} - -/* - * suboption() - * - * Look at the sub-option buffer, and try to be helpful to the other - * side. - * - * Currently we recognize: - * - * Terminal type is - * Terminal size - * Terminal speed is - */ - -suboption() -{ - switch (SB_GET()) { - case TELOPT_TTYPE: { /* Yaaaay! */ - static char terminalname[5+41] = "TERM="; - settimer(ttypesubopt); - - if (SB_GET() != TELQUAL_IS) { - return; /* ??? XXX but, this is the most robust */ - } - - terminaltype = terminalname+strlen(terminalname); - - while ((terminaltype < (terminalname + sizeof terminalname-1)) && - !SB_EOF()) { - register int c; - - c = SB_GET(); - if (isupper(c)) { - c = tolower(c); - } - *terminaltype++ = c; /* accumulate name */ - } - *terminaltype = 0; - terminaltype = terminalname; - break; - } - case TELOPT_NAWS: { - struct winsize win; - - ioctl(pty, TIOCGWINSZ, &win); - settimer(ttypesubopt); - - syslog(LOG_INFO, "%x %x %x %x", - subpointer[0],subpointer[1],subpointer[2],subpointer[3]); - win.ws_col = SB_GET() << 8; - win.ws_col |= SB_GET(); - win.ws_row = SB_GET() << 8; - win.ws_row |= SB_GET(); - syslog(LOG_INFO, "col %d row %d", win.ws_col, win.ws_row); - ioctl(pty, TIOCSWINSZ, &win); - break; - } - case TELOPT_TSPEED: { - char speeds[41],*cp=speeds; - struct sgttyb b; - int ispeed,ospeed; - char *ispeeds,*ospeeds; - - if (SB_GET() != TELQUAL_IS) { - return; /* ??? XXX but, this is the most robust */ - } + switch (ctlbuf[0]) { + case M_FLUSH: + if (ibuf[1] & FLUSHW) + ibuf[0] = TIOCPKT_FLUSHWRITE; + return(1); + + case M_IOCTL: + ip = (struct iocblk *) (ibuf+1); + + switch (ip->ioc_cmd) { + case TCSETS: + case TCSETSW: + case TCSETSF: + tsp = (struct termios *) + (ibuf+1 + sizeof(struct iocblk)); + vstop = tsp->c_cc[VSTOP]; + vstart = tsp->c_cc[VSTART]; + ixon = tsp->c_iflag & IXON; + break; + case TCSETA: + case TCSETAW: + case TCSETAF: + tp = (struct termio *) (ibuf+1 + sizeof(struct iocblk)); + vstop = tp->c_cc[VSTOP]; + vstart = tp->c_cc[VSTART]; + ixon = tp->c_iflag & IXON; + break; + default: + errno = EAGAIN; + return(-1); + } - ispeeds = NULL; - ospeeds = speeds; - ispeed = 0; - ospeed = 0; - while ((cp < (speeds + sizeof speeds-1)) && !SB_EOF()) { - register int c; - - c = SB_GET(); - if (c == ',') { - c = 0; - ispeeds = cp+1; - } - *cp++ = c; /* accumulate name */ - } - *cp = 0; - - if (ispeeds) - ispeed = string2speed(ispeeds); - if (ospeeds) - ospeed = string2speed(ospeeds); - - if (ispeed && ospeed) { - ioctl(pty, TIOCGETP, &b); - b.sg_ospeed = ospeed; - b.sg_ispeed = ispeed; - ioctl(pty, TIOCSETP, &b); + newflow = (ixon && (vstart == 021) && (vstop == 023)) ? 1 : 0; + if (newflow != flowison) { /* it's a change */ + flowison = newflow; + ibuf[0] = newflow ? TIOCPKT_DOSTOP : TIOCPKT_NOSTOP; + return(1); + } } - break; - } - default: - ; - } -} - -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); + /* nothing worth doing anything about */ + errno = EAGAIN; + return(-1); } +#endif /* STREAMSPTY */ /* * Send interrupt to process on other side of pty. * If it is in raw mode, just write NULL; * otherwise, write intr char. */ + void 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; + +#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 */ } /* @@ -1225,293 +1503,62 @@ interrupt() * If it is in raw mode, just write NULL; * otherwise, write quit char. */ + void sendbrk() { - 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 ? - '\034' : tchars.t_quitc; -} - -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 *)SIGQUIT); +#else /* TCSIG */ + init_termbuf(); + *pfrontp++ = slctab[SLC_ABORT].sptr ? + (unsigned char)*slctab[SLC_ABORT].sptr : '\034'; +#endif /* TCSIG */ } - -/* - * nextitem() - * - * Return the address of the next "item" in the TELNET data - * stream. This will be the address of the next character if - * the current address is a user data character, or it will - * be the address of the character following the TELNET command - * if the current address is a TELNET IAC ("I Am a Command") - * character. - */ -char * -nextitem(current) -char *current; + void +sendsusp() { - if ((*current&0xff) != IAC) { - return current+1; - } - switch (*(current+1)&0xff) { - case DO: - case DONT: - case WILL: - case WONT: - return current+3; - case SB: /* loop forever looking for the SE */ - { - register char *look = current+2; - - for (;;) { - if ((*look++&0xff) == IAC) { - if ((*look++&0xff) == SE) { - return look; - } - } - } - } - default: - return current+2; - } +#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 */ } - /* - * netclear() - * - * We are about to do a TELNET SYNCH operation. Clear - * the path to the network. - * - * Things are a bit tricky since we may have sent the first - * byte or so of a previous TELNET command into the network. - * So, we have to scan the network buffer from the beginning - * until we are up to where we want to be. - * - * A side effect of what we do, just to keep things - * simple, is to clear the urgent data pointer. The principal - * caller should be setting the urgent data pointer AFTER calling - * us in any case. + * When we get an AYT, if ^T is enabled, use that. Otherwise, + * just send back "[Yes]". */ - -netclear() -{ - register char *thisitem, *next; - char *good; -#define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \ - ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL)) - - thisitem = netobuf; - - while ((next = nextitem(thisitem)) <= nbackp) { - thisitem = next; - } - - /* Now, thisitem is first before/at boundary. */ - - good = netobuf; /* where the good bytes go */ - - while (nfrontp > thisitem) { - if (wewant(thisitem)) { - int length; - - next = thisitem; - do { - next = nextitem(next); - } while (wewant(next) && (nfrontp > next)); - length = next-thisitem; - bcopy(thisitem, good, length); - good += length; - thisitem = next; - } else { - thisitem = nextitem(thisitem); - } - } - - nbackp = netobuf; - nfrontp = good; /* next byte to be sent */ - neturg = 0; -} - -/* - * netflush - * Send as much data as possible to the network, - * handling requests for urgent data. - */ - - -netflush() -{ - int n; - - if ((n = nfrontp - nbackp) > 0) { - /* - * if no urgent data, or if the other side appears to be an - * old 4.2 client (and thus unable to survive TCP urgent data), - * write the entire buffer in non-OOB mode. - */ - if ((neturg == 0) || (not42 == 0)) { - n = write(net, nbackp, n); /* normal write */ - } else { - n = neturg - nbackp; - /* - * In 4.2 (and 4.3) systems, there is some question about - * what byte in a sendOOB operation is the "OOB" data. - * To make ourselves compatible, we only send ONE byte - * out of band, the one WE THINK should be OOB (though - * we really have more the TCP philosophy of urgent data - * rather than the Unix philosophy of OOB data). - */ - if (n > 1) { - n = send(net, nbackp, n-1, 0); /* send URGENT all by itself */ - } else { - n = send(net, nbackp, n, MSG_OOB); /* URGENT data */ - } - } - } - if (n < 0) { - if (errno == EWOULDBLOCK) - return; - /* should blow this guy away... */ - return; - } - nbackp += n; - if (nbackp >= neturg) { - neturg = 0; - } - if (nbackp == nfrontp) { - nbackp = nfrontp = netobuf; - } -} - -cleanup() + void +recv_ayt() { - char *p; - - p = line + sizeof("/dev/") - 1; - if (logout(p)) - logwtmp(p, "", ""); - (void)chmod(line, 0666); - (void)chown(line, 0, 0); - *p = 'p'; - (void)chmod(line, 0666); - (void)chown(line, 0, 0); - shutdown(net, 2); - exit(1); -} - -char editedhost[32]; - -edithost(pat, host) - register char *pat; - register char *host; -{ - register char *res = editedhost; - - if (!pat) - pat = ""; - while (*pat) { - switch (*pat) { - - case '#': - if (*host) - host++; - break; - - case '@': - if (*host) - *res++ = *host++; - break; - - default: - *res++ = *pat; - break; - - } - if (res == &editedhost[sizeof editedhost - 1]) { - *res = '\0'; - return; - } - pat++; +#if defined(SIGINFO) && defined(TCSIG) + if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) { + (void) ioctl(pty, TCSIG, (char *)SIGINFO); + return; } - if (*host) - strncpy(res, host, sizeof editedhost - (res - editedhost) - 1); - else - *res = '\0'; - editedhost[sizeof editedhost - 1] = '\0'; +#endif + (void) strcpy(nfrontp, "\r\n[Yes]\r\n"); + nfrontp += 9; } -static char *putlocation; - -puts(s) -register char *s; + void +doeof() { + init_termbuf(); - while (*s) - putchr(*s++); -} - -putchr(cc) -{ - *putlocation++ = cc; -} - -putf(cp, where) -register char *cp; -char *where; -{ - char *slash; - char datebuffer[60]; - extern char *rindex(); - - putlocation = where; - - while (*cp) { - if (*cp != '%') { - putchr(*cp++); - continue; - } - switch (*++cp) { - - case 't': - slash = rindex(line, '/'); - if (slash == (char *) 0) - puts(line); - else - puts(&slash[1]); - break; - - case 'h': - puts(editedhost); - break; - - case 'd': - get_date(datebuffer); - puts(datebuffer); - break; - - case '%': - putchr('%'); - break; - } - cp++; +#if defined(LINEMODE) && defined(USE_TERMIO) && (VEOF == VMIN) + if (!tty_isediting()) { + extern char oldeofc; + *pfrontp++ = oldeofc; + return; } +#endif + *pfrontp++ = slctab[SLC_EOF].sptr ? + (unsigned char)*slctab[SLC_EOF].sptr : '\004'; }