diff options
Diffstat (limited to 'libexec/telnetd/telnetd.c')
| -rw-r--r-- | libexec/telnetd/telnetd.c | 1117 |
1 files changed, 0 insertions, 1117 deletions
diff --git a/libexec/telnetd/telnetd.c b/libexec/telnetd/telnetd.c deleted file mode 100644 index 042fea5..0000000 --- a/libexec/telnetd/telnetd.c +++ /dev/null @@ -1,1117 +0,0 @@ -/* - * Copyright (c) 1989, 1993 - * The Regents of the University of California. All rights reserved. - * - * Redistribution and use in source and binary forms, with or without - * modification, are permitted provided that the following conditions - * are met: - * 1. Redistributions of source code must retain the above copyright - * notice, this list of conditions and the following disclaimer. - * 2. Redistributions in binary form must reproduce the above copyright - * notice, this list of conditions and the following disclaimer in the - * documentation and/or other materials provided with the distribution. - * 3. All advertising materials mentioning features or use of this software - * must display the following acknowledgement: - * This product includes software developed by the University of - * California, Berkeley and its contributors. - * 4. Neither the name of the University nor the names of its contributors - * may be used to endorse or promote products derived from this software - * without specific prior written permission. - * - * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND - * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE - * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE - * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE - * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL - * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS - * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) - * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT - * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY - * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF - * SUCH DAMAGE. - */ - -#if 0 -#ifndef lint -static const char sccsid[] = "@(#)telnetd.c 8.4 (Berkeley) 5/30/95"; -#endif -#endif -#include <sys/cdefs.h> -__FBSDID("$FreeBSD$"); - -#include "telnetd.h" -#include "pathnames.h" - -#include <sys/mman.h> -#include <err.h> -#include <libutil.h> -#include <paths.h> -#include <termcap.h> -#include <utmp.h> - -#include <arpa/inet.h> - -#include <libtelnet/misc.h> - -char remote_hostname[MAXHOSTNAMELEN]; -size_t utmp_len = sizeof(remote_hostname) - 1; -int registerd_host_only = 0; - - -/* - * I/O data buffers, - * pointers, and counters. - */ -char ptyibuf[BUFSIZ], *ptyip = ptyibuf; -char ptyibuf2[BUFSIZ]; - -int readstream(int, char *, int); -void doit(struct sockaddr *); -int terminaltypeok(char *); - -int hostinfo = 1; /* do we print login banner? */ - -static int debug = 0; -int keepalive = 1; -const char *altlogin; - -void doit(struct sockaddr *); -int terminaltypeok(char *); -void startslave(char *, int, char *); -extern void usage(void); -static void _gettermname(void); - -/* - * 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', 'p', ':', 'S', ':', 'u', ':', 'U', - '4', '6', -#ifdef BFTPDAEMON - 'B', -#endif -#ifdef DIAGNOSTICS - 'D', ':', -#endif -#ifdef LINEMODE - 'l', -#endif - '\0' -}; - -int family = AF_INET; - -#ifndef MAXHOSTNAMELEN -#define MAXHOSTNAMELEN 256 -#endif /* MAXHOSTNAMELEN */ - -char *hostname; -char host_name[MAXHOSTNAMELEN]; - -extern void telnet(int, int, char *); - -int level; -char user_name[256]; - -int -main(int argc, char *argv[]) -{ - struct sockaddr_storage from; - int on = 1, fromlen; - int ch; -#if defined(IPPROTO_IP) && defined(IP_TOS) - int tos = -1; -#endif - - pfrontp = pbackp = ptyobuf; - netip = netibuf; - nfrontp = nbackp = netobuf; - - /* - * This initialization causes linemode to default to a configuration - * that works on all telnet clients, including the FreeBSD client. - * This is not quite the same as the telnet client issuing a "mode - * character" command, but has most of the same benefits, and is - * preferable since some clients (like usofts) don't have the - * mode character command anyway and linemode breaks things. - * The most notable symptom of fix is that csh "set filec" operations - * like <ESC> (filename completion) and ^D (choices) keys now work - * in telnet sessions and can be used more than once on the same line. - * CR/LF handling is also corrected in some termio modes. This - * change resolves problem reports bin/771 and bin/1037. - */ - - linemode=1; /*Default to mode that works on bulk of clients*/ - - while ((ch = getopt(argc, argv, valid_opts)) != -1) { - switch(ch) { - - -#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 */ - - - case 'h': - hostinfo = 0; - break; - -#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; - - case 'p': - altlogin = optarg; - break; - - case 'S': -#ifdef HAS_GETTOS - if ((tos = parsetos(optarg, "tcp")) < 0) - warnx("%s%s%s", - "bad TOS argument '", optarg, - "'; will try to use default TOS"); -#else - warnx("TOS option unavailable; -S flag not supported"); -#endif - break; - - case 'u': - utmp_len = (size_t)atoi(optarg); - if (utmp_len >= sizeof(remote_hostname)) - utmp_len = sizeof(remote_hostname) - 1; - break; - - case 'U': - registerd_host_only = 1; - break; - - - case '4': - family = AF_INET; - break; - -#ifdef INET6 - case '6': - family = AF_INET6; - break; -#endif - - default: - warnx("%c: unknown option", ch); - /* FALLTHROUGH */ - case '?': - usage(); - /* NOTREACHED */ - } - } - - argc -= optind; - argv += optind; - - if (debug) { - int s, ns, foo, error; - const char *service = "telnet"; - struct addrinfo hints, *res; - - if (argc > 1) { - usage(); - /* NOT REACHED */ - } else if (argc == 1) - service = *argv; - - memset(&hints, 0, sizeof(hints)); - hints.ai_flags = AI_PASSIVE; - hints.ai_family = family; - hints.ai_socktype = SOCK_STREAM; - hints.ai_protocol = 0; - error = getaddrinfo(NULL, service, &hints, &res); - - if (error) { - errx(1, "tcp/%s: %s\n", service, gai_strerror(error)); - if (error == EAI_SYSTEM) - errx(1, "tcp/%s: %s\n", service, strerror(errno)); - usage(); - } - - s = socket(res->ai_family, res->ai_socktype, res->ai_protocol); - if (s < 0) - err(1, "socket"); - (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, - (char *)&on, sizeof(on)); - if (bind(s, res->ai_addr, res->ai_addrlen) < 0) - err(1, "bind"); - if (listen(s, 1) < 0) - err(1, "listen"); - foo = res->ai_addrlen; - ns = accept(s, res->ai_addr, &foo); - if (ns < 0) - err(1, "accept"); - (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 */ - } - - openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON); - fromlen = sizeof (from); - if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) { - warn("getpeername"); - _exit(1); - } - if (keepalive && - setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, - (char *)&on, sizeof (on)) < 0) { - syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m"); - } - -#if defined(IPPROTO_IP) && defined(IP_TOS) - if (from.ss_family == AF_INET) { -# 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((struct sockaddr *)&from); - /* NOTREACHED */ - return(0); -} /* end of main */ - - void -usage() -{ - fprintf(stderr, "usage: telnetd"); -#ifdef BFTPDAEMON - fprintf(stderr, " [-B]"); -#endif - fprintf(stderr, " [-debug]"); -#ifdef DIAGNOSTICS - fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t"); -#endif - fprintf(stderr, " [-h]"); -#if defined(LINEMODE) && defined(KLUDGELINEMODE) - fprintf(stderr, " [-k]"); -#endif -#ifdef LINEMODE - fprintf(stderr, " [-l]"); -#endif - fprintf(stderr, " [-n]"); - fprintf(stderr, "\n\t"); -#ifdef HAS_GETTOS - fprintf(stderr, " [-S tos]"); -#endif - fprintf(stderr, " [-u utmp_hostname_length] [-U]"); - fprintf(stderr, " [port]\n"); - exit(1); -} - -/* - * getterminaltype - * - * Ask the other end to send along its terminal type and speed. - * Output is the variable terminaltype filled in. - */ -static unsigned char ttytype_sbbuf[] = { - IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE -}; - - -#define undef2 __unused - -static int -getterminaltype(char *name undef2) -{ - int retval = -1; - - settimer(baseline); - - send_do(TELOPT_TTYPE, 1); - send_do(TELOPT_TSPEED, 1); - send_do(TELOPT_XDISPLOC, 1); - send_do(TELOPT_NEW_ENVIRON, 1); - send_do(TELOPT_OLD_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_NEW_ENVIRON) || - his_will_wont_is_changing(TELOPT_OLD_ENVIRON)) { - ttloop(); - } - if (his_state_is_will(TELOPT_TSPEED)) { - static unsigned char sb[] = - { IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE }; - - output_datalen(sb, sizeof sb); - DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); - } - if (his_state_is_will(TELOPT_XDISPLOC)) { - static unsigned char sb[] = - { IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE }; - - output_datalen(sb, sizeof sb); - DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); - } - if (his_state_is_will(TELOPT_NEW_ENVIRON)) { - static unsigned char sb[] = - { IAC, SB, TELOPT_NEW_ENVIRON, TELQUAL_SEND, IAC, SE }; - - output_datalen(sb, sizeof sb); - DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); - } - else if (his_state_is_will(TELOPT_OLD_ENVIRON)) { - static unsigned char sb[] = - { IAC, SB, TELOPT_OLD_ENVIRON, TELQUAL_SEND, IAC, SE }; - - output_datalen(sb, sizeof sb); - DIAG(TD_OPTIONS, printsub('>', sb + 2, sizeof sb - 2);); - } - if (his_state_is_will(TELOPT_TTYPE)) { - - output_datalen(ttytype_sbbuf, sizeof ttytype_sbbuf); - DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, - sizeof ttytype_sbbuf - 2);); - } - 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_NEW_ENVIRON)) { - while (sequenceIs(environsubopt, baseline)) - ttloop(); - } - if (his_state_is_will(TELOPT_OLD_ENVIRON)) { - while (sequenceIs(oenvironsubopt, 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)-1); - first[sizeof(first)-1] = '\0'; - for(;;) { - /* - * Save the unknown name, and request the next name. - */ - (void) strncpy(last, terminaltype, sizeof(last)-1); - last[sizeof(last)-1] = '\0'; - _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(terminaltype)-1); - terminaltype[sizeof(terminaltype)-1] = '\0'; - } - break; - } - } - } - } - return(retval); -} /* end of getterminaltype */ - -static void -_gettermname(void) -{ - /* - * If the client turned off the option, - * we can't send another request, so we - * just return. - */ - if (his_state_is_wont(TELOPT_TTYPE)) - return; - settimer(baseline); - output_datalen(ttytype_sbbuf, sizeof ttytype_sbbuf); - DIAG(TD_OPTIONS, printsub('>', ttytype_sbbuf + 2, - sizeof ttytype_sbbuf - 2);); - while (sequenceIs(ttypesubopt, baseline)) - ttloop(); -} - -int -terminaltypeok(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. - */ -void -doit(struct sockaddr *who) -{ - int err_; /* XXX */ - int ptynum; - - /* - * 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; - - if ((lp = getpty()) == NULL) - fatal(net, "Out of ptys"); - - if ((pty = open(lp, 2)) >= 0) { - strlcpy(line,lp,sizeof(line)); - line[5] = 't'; - break; - } - } -#endif - - /* get name of connected client */ - if (realhostname_sa(remote_hostname, sizeof(remote_hostname) - 1, - who, who->sa_len) == HOSTNAME_INVALIDADDR && registerd_host_only) - fatal(net, "Couldn't resolve your address into a host name.\r\n\ - Please contact your net administrator"); - remote_hostname[sizeof(remote_hostname) - 1] = '\0'; - - trimdomain(remote_hostname, UT_HOSTSIZE); - if (!isdigit(remote_hostname[0]) && strlen(remote_hostname) > utmp_len) - err_ = getnameinfo(who, who->sa_len, remote_hostname, - sizeof(remote_hostname), NULL, 0, - NI_NUMERICHOST|NI_WITHSCOPEID); - /* XXX: do 'err_' check */ - - (void) gethostname(host_name, sizeof(host_name) - 1); - host_name[sizeof(host_name) - 1] = '\0'; - hostname = host_name; - - - init_env(); - /* - * get terminal type. - */ - *user_name = 0; - level = getterminaltype(user_name); - setenv("TERM", terminaltype ? terminaltype : "network", 1); - - telnet(net, pty, remote_hostname); /* begin server process */ - - /*NOTREACHED*/ -} /* end of doit */ - -/* - * Main loop. Select from pty and network, and - * hand data to telnet receiver finite state machine. - */ -void -telnet(int f, int p, char *host) -{ - int on = 1; -#define TABBUFSIZ 512 - char defent[TABBUFSIZ]; - char defstrs[TABBUFSIZ]; -#undef TABBUFSIZ - char *HE; - char *HN; - char *IM; - int nfd; - - /* - * 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 */ - restartany = -1; /* uninitialized... */ - send_do(TELOPT_LFLOW, 1); - - /* - * Spin, waiting for a response from the DO ECHO. However, - * some REALLY DUMB telnets out there might not respond - * to the DO ECHO. So, we spin looking for NAWS, (most dumb - * telnets so far seem to respond with WONT for a DO that - * they don't understand...) because by the time we get the - * response, it will already have processed the DO ECHO. - * Kludge upon kludge. - */ - while (his_will_wont_is_changing(TELOPT_NAWS)) - ttloop(); - - /* - * But... - * The client might have sent a WILL NAWS as part of its - * startup code; if so, we'll be here before we get the - * response to the DO ECHO. We'll make the assumption - * that any implementation that understands about NAWS - * is a modern enough implementation that it will respond - * to our DO ECHO request; hence we'll do another spin - * waiting for the ECHO option to settle down, which is - * what we wanted to do in the first place... - */ - if (his_want_state_is_will(TELOPT_ECHO) && - his_state_is_will(TELOPT_NAWS)) { - while (his_will_wont_is_changing(TELOPT_ECHO)) - ttloop(); - } - /* - * On the off chance that the telnet client is broken and does not - * respond to the DO ECHO we sent, (after all, we did send the - * DO NAWS negotiation after the DO ECHO, and we won't get here - * until a response to the DO NAWS comes back) simulate the - * receipt of a will echo. This will also send a WONT ECHO - * to the client, since we assume that the client failed to - * respond because it believes that it is already in DO ECHO - * mode, which we do not want. - */ - if (his_want_state_is_will(TELOPT_ECHO)) { - DIAG(TD_OPTIONS, output_data("td: simulating recv\r\n")); - willoption(TELOPT_ECHO); - } - - /* - * Finally, to clean things up, we turn on our echo. This - * will break stupid 4.2 telnets out of local terminal echo. - */ - - if (my_state_is_wont(TELOPT_ECHO)) - send_will(TELOPT_ECHO, 1); - - /* - * Turn on packet mode - */ - (void) ioctl(p, TIOCPKT, (char *)&on); - -#if defined(LINEMODE) && defined(KLUDGELINEMODE) - /* - * Continuing line mode support. If client does not support - * real linemode, attempt to negotiate kludge linemode by sending - * the do timing mark sequence. - */ - if (lmodetype < REAL_LINEMODE) - send_do(TELOPT_TM, 1); -#endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */ - - /* - * Call telrcv() once to pick up anything received during - * terminal type negotiation, 4.2/4.3 determination, and - * linemode negotiation. - */ - telrcv(); - - (void) ioctl(f, FIONBIO, (char *)&on); - (void) ioctl(p, FIONBIO, (char *)&on); - -#if defined(SO_OOBINLINE) - (void) setsockopt(net, SOL_SOCKET, SO_OOBINLINE, - (char *)&on, sizeof on); -#endif /* defined(SO_OOBINLINE) */ - -#ifdef SIGTSTP - (void) signal(SIGTSTP, SIG_IGN); -#endif -#ifdef SIGTTOU - /* - * Ignoring SIGTTOU keeps the kernel from blocking us - * in ttioct() in /sys/tty.c. - */ - (void) signal(SIGTTOU, SIG_IGN); -#endif - - (void) signal(SIGCHLD, cleanup); - -#ifdef TIOCNOTTY - { - int t; - t = open(_PATH_TTY, O_RDWR); - if (t >= 0) { - (void) ioctl(t, TIOCNOTTY, (char *)0); - (void) close(t); - } - } -#endif - - /* - * Show banner that getty never gave. - * - * We put the banner in the pty input buffer. This way, it - * gets carriage return null processing, etc., just like all - * other pty --> client data. - */ - - if (getent(defent, "default") == 1) { - char *cp=defstrs; - - HE = Getstr("he", &cp); - HN = Getstr("hn", &cp); - IM = Getstr("im", &cp); - if (HN && *HN) - (void) strlcpy(host_name, HN, sizeof(host_name)); - if (IM == 0) - IM = strdup(""); - } else { - IM = strdup(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, output_data("td: Entering processing loop\r\n")); - - /* - * Startup the login process on the slave side of the terminal - * now. We delay this until here to insure option negotiation - * is complete. - */ - startslave(host, level, user_name); - - nfd = ((f > p) ? f : p) + 1; - for (;;) { - fd_set ibits, obits, xbits; - int c; - - if (ncc < 0 && pcc < 0) - break; - - FD_ZERO(&ibits); - FD_ZERO(&obits); - FD_ZERO(&xbits); - /* - * Never look for input if there's still - * stuff in the corresponding output buffer - */ - if (nfrontp - nbackp || pcc > 0) { - FD_SET(f, &obits); - } else { - FD_SET(p, &ibits); - } - if (pfrontp - pbackp || ncc > 0) { - FD_SET(p, &obits); - } else { - FD_SET(f, &ibits); - } - if (!SYNCHing) { - FD_SET(f, &xbits); - } - if ((c = select(nfd, &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; - } - DIAG((TD_REPORT | TD_NETDATA), - output_data("td: netread %d chars\r\n", ncc)); - DIAG(TD_NETDATA, printdata("nd", netip, ncc)); - } - - /* - * Something to read from the pty... - */ - if (FD_ISSET(p, &ibits)) { - pcc = read(p, ptyibuf, BUFSIZ); - /* - * On some systems, if we try to read something - * off the master side before the slave side is - * opened, we get EIO. - */ - if (pcc < 0 && (errno == EWOULDBLOCK || -#ifdef EAGAIN - errno == EAGAIN || -#endif - errno == EIO)) { - pcc = 0; - } else { - if (pcc <= 0) - break; -#ifdef LINEMODE - /* - * If ioctl from pty, pass it through net - */ - if (ptyibuf[0] & TIOCPKT_IOCTL) { - copy_termbuf(ptyibuf+1, pcc-1); - localstat(); - pcc = 1; - } -#endif /* LINEMODE */ - if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) { - netclear(); /* clear buffer back */ -#ifndef NO_URGENT - /* - * There are client telnets on some - * operating systems get screwed up - * royally if we send them urgent - * mode data. - */ - output_data("%c%c", IAC, DM); - neturg = nfrontp-1; /* off by one XXX */ - DIAG(TD_OPTIONS, - printoption("td: send IAC", DM)); - -#endif - } - if (his_state_is_will(TELOPT_LFLOW) && - (ptyibuf[0] & - (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) { - int newflow = - ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0; - if (newflow != flowmode) { - flowmode = newflow; - output_data("%c%c%c%c%c%c", - IAC, SB, TELOPT_LFLOW, - flowmode ? LFLOW_ON - : LFLOW_OFF, - IAC, SE); - DIAG(TD_OPTIONS, printsub('>', - (unsigned char *)nfrontp-4, - 4);); - } - } - pcc--; - ptyip = ptyibuf+1; - } - } - - while (pcc > 0) { - if ((&netobuf[BUFSIZ] - nfrontp) < 2) - break; - c = *ptyip++ & 0377, pcc--; - if (c == IAC) - output_data("%c", c); - output_data("%c", c); - if ((c == '\r') && (my_state_is_wont(TELOPT_BINARY))) { - if (pcc > 0 && ((*ptyip & 0377) == '\n')) { - output_data("%c", *ptyip++ & 0377); - pcc--; - } else - output_data("%c", '\0'); - } - } - - if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0) - netflush(); - if (ncc > 0) - telrcv(); - if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0) - ptyflush(); - } - cleanup(0); -} /* end of telnet */ - -#ifndef TCSIG -# ifdef TIOCSIG -# define TCSIG TIOCSIG -# endif -#endif - -/* - * Send interrupt to process on other side of pty. - * If it is in raw mode, just write NULL; - * otherwise, write intr char. - */ -void -interrupt(void) -{ - ptyflush(); /* half-hearted */ - -#ifdef TCSIG - (void) ioctl(pty, TCSIG, (char *)SIGINT); -#else /* TCSIG */ - init_termbuf(); - *pfrontp++ = slctab[SLC_IP].sptr ? - (unsigned char)*slctab[SLC_IP].sptr : '\177'; -#endif /* TCSIG */ -} - -/* - * Send quit to process on other side of pty. - * If it is in raw mode, just write NULL; - * otherwise, write quit char. - */ -void -sendbrk(void) -{ - ptyflush(); /* half-hearted */ -#ifdef TCSIG - (void) ioctl(pty, TCSIG, (char *)SIGQUIT); -#else /* TCSIG */ - init_termbuf(); - *pfrontp++ = slctab[SLC_ABORT].sptr ? - (unsigned char)*slctab[SLC_ABORT].sptr : '\034'; -#endif /* TCSIG */ -} - -void -sendsusp(void) -{ -#ifdef SIGTSTP - ptyflush(); /* half-hearted */ -# ifdef TCSIG - (void) ioctl(pty, TCSIG, (char *)SIGTSTP); -# else /* TCSIG */ - *pfrontp++ = slctab[SLC_SUSP].sptr ? - (unsigned char)*slctab[SLC_SUSP].sptr : '\032'; -# endif /* TCSIG */ -#endif /* SIGTSTP */ -} - -/* - * When we get an AYT, if ^T is enabled, use that. Otherwise, - * just send back "[Yes]". - */ -void -recv_ayt(void) -{ -#if defined(SIGINFO) && defined(TCSIG) - if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) { - (void) ioctl(pty, TCSIG, (char *)SIGINFO); - return; - } -#endif - output_data("\r\n[Yes]\r\n"); -} - -void -doeof(void) -{ - init_termbuf(); - -#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'; -} |
