Index: telnetd.c
===================================================================
--- telnetd.c (nonexistent)
+++ telnetd.c (revision 5)
@@ -0,0 +1,1164 @@
+/*
+ * Copyright (c) 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+char copyright[] =
+ "@(#) Copyright (c) 1989 Regents of the University of California.\n"
+ "All rights reserved.\n";
+
+/*
+ * From: @(#)telnetd.c 5.48 (Berkeley) 3/1/91
+ */
+char telnetd_rcsid[] =
+ "$Id: telnetd.c,v 1.24 2000/04/12 21:36:12 dholland Exp $";
+
+#include "../version.h"
+
+#include <netdb.h>
+#include <termcap.h>
+#include <netinet/in.h>
+/* #include <netinet/ip.h> */ /* Don't think this is used at all here */
+#include <arpa/inet.h>
+#include <assert.h>
+#include "telnetd.h"
+#include "pathnames.h"
+#include "setproctitle.h"
+
+#if defined(AUTHENTICATE)
+#include <libtelnet/auth.h>
+#include <libtelnet/auth-proto.h>
+#include <libtelnet/misc-proto.h>
+int auth_level = 0;
+#endif
+#if defined(SecurID)
+int require_SecurID = 0;
+#endif
+
+/* In Linux, this is an enum */
+#if defined(__linux__) || defined(IPPROTO_IP)
+#define HAS_IPPROTO_IP
+#endif
+
+static void doit(struct sockaddr_in *who);
+static int terminaltypeok(const char *s);
+
+/*
+ * I/O data buffers,
+ * pointers, and counters.
+ */
+char ptyibuf[BUFSIZ], *ptyip = ptyibuf;
+char ptyibuf2[BUFSIZ];
+
+int hostinfo = 1; /* do we print login banner? */
+
+int debug = 0;
+int keepalive = 1;
+char *loginprg = _PATH_LOGIN;
+char *progname;
+
+extern void usage(void);
+
+int
+main(int argc, char *argv[], char *env[])
+{
+ struct sockaddr_in from;
+ int on = 1;
+ socklen_t fromlen;
+ register int ch;
+
+#if defined(HAS_IPPROTO_IP) && defined(IP_TOS)
+ int tos = -1;
+#endif
+
+ initsetproctitle(argc, argv, env);
+
+ pfrontp = pbackp = ptyobuf;
+ netip = netibuf;
+ nfrontp = nbackp = netobuf;
+#if defined(ENCRYPT)
+ nclearto = 0;
+#endif
+
+ progname = *argv;
+
+ while ((ch = getopt(argc, argv, "d:a:e:lhnr:I:D:B:sS:a:X:L:")) != EOF) {
+ switch(ch) {
+
+#ifdef AUTHENTICATE
+ case 'a':
+ /*
+ * Check for required authentication level
+ */
+ if (strcmp(optarg, "debug") == 0) {
+ extern int auth_debug_mode;
+ auth_debug_mode = 1;
+ } else if (strcasecmp(optarg, "none") == 0) {
+ auth_level = 0;
+ } else if (strcasecmp(optarg, "other") == 0) {
+ auth_level = AUTH_OTHER;
+ } else if (strcasecmp(optarg, "user") == 0) {
+ auth_level = AUTH_USER;
+ } else if (strcasecmp(optarg, "valid") == 0) {
+ auth_level = AUTH_VALID;
+ } else if (strcasecmp(optarg, "off") == 0) {
+ /*
+ * This hack turns off authentication
+ */
+ auth_level = -1;
+ } else {
+ fprintf(stderr,
+ "telnetd: unknown authorization level for -a\n");
+ }
+ break;
+#endif /* AUTHENTICATE */
+
+#ifdef BFTPDAEMON
+ case 'B':
+ bftpd++;
+ break;
+#endif /* BFTPDAEMON */
+
+ case 'd':
+ if (strcmp(optarg, "ebug") == 0) {
+ debug++;
+ break;
+ }
+ usage();
+ /* NOTREACHED */
+ break;
+
+#ifdef DIAGNOSTICS
+ case 'D':
+ /*
+ * Check for desired diagnostics capabilities.
+ */
+ if (!strcmp(optarg, "report")) {
+ diagnostic |= TD_REPORT|TD_OPTIONS;
+ } else if (!strcmp(optarg, "exercise")) {
+ diagnostic |= TD_EXERCISE;
+ } else if (!strcmp(optarg, "netdata")) {
+ diagnostic |= TD_NETDATA;
+ } else if (!strcmp(optarg, "ptydata")) {
+ diagnostic |= TD_PTYDATA;
+ } else if (!strcmp(optarg, "options")) {
+ diagnostic |= TD_OPTIONS;
+ } else {
+ usage();
+ /* NOT REACHED */
+ }
+ break;
+#endif /* DIAGNOSTICS */
+
+#ifdef AUTHENTICATE
+ case 'e':
+ if (strcmp(optarg, "debug") == 0) {
+ extern int auth_debug_mode;
+ auth_debug_mode = 1;
+ break;
+ }
+ usage();
+ /* NOTREACHED */
+ break;
+#endif /* AUTHENTICATE */
+
+ case 'h':
+ hostinfo = 0;
+ break;
+
+#ifdef LINEMODE
+ case 'l':
+ alwayslinemode = 1;
+ break;
+#endif /* LINEMODE */
+
+ case 'L':
+ loginprg = strdup(optarg);
+ /* XXX what if strdup fails? */
+ break;
+
+ case 'n':
+ keepalive = 0;
+ break;
+
+#ifdef SecurID
+ case 's':
+ /* SecurID required */
+ require_SecurID = 1;
+ break;
+#endif /* SecurID */
+ case 'S':
+#ifdef HAS_GETTOS
+ if ((tos = parsetos(optarg, "tcp")) < 0)
+ fprintf(stderr, "%s%s%s\n",
+ "telnetd: Bad TOS argument '", optarg,
+ "'; will try to use default TOS");
+#else
+ fprintf(stderr, "%s%s\n", "TOS option unavailable; ",
+ "-S flag not supported\n");
+#endif
+ break;
+
+#ifdef AUTHENTICATE
+ case 'X':
+ /*
+ * Check for invalid authentication types
+ */
+ auth_disable_name(optarg);
+ break;
+#endif /* AUTHENTICATE */
+
+ default:
+ fprintf(stderr, "telnetd: %c: unknown option\n", ch);
+ /* FALLTHROUGH */
+ case '?':
+ usage();
+ /* NOTREACHED */
+ }
+ }
+
+ argc -= optind;
+ argv += optind;
+
+ if (debug) {
+ int s, ns;
+ socklen_t foo;
+ struct servent *sp;
+ struct sockaddr_in sn;
+
+ memset(&sn, 0, sizeof(sn));
+ sn.sin_family = AF_INET;
+
+ if (argc > 1) {
+ usage();
+ /* NOTREACHED */
+ } else if (argc == 1) {
+ if ((sp = getservbyname(*argv, "tcp"))!=NULL) {
+ sn.sin_port = sp->s_port;
+ }
+ else {
+ int pt = atoi(*argv);
+ if (pt <= 0) {
+ fprintf(stderr, "telnetd: %s: bad port number\n",
+ *argv);
+ usage();
+ /* NOTREACHED */
+ }
+ sn.sin_port = htons(pt);
+ }
+ } else {
+ sp = getservbyname("telnet", "tcp");
+ if (sp == 0) {
+ fprintf(stderr, "telnetd: tcp/telnet: unknown service\n");
+ exit(1);
+ }
+ sn.sin_port = sp->s_port;
+ }
+
+ s = socket(AF_INET, SOCK_STREAM, 0);
+ if (s < 0) {
+ perror("telnetd: socket");;
+ exit(1);
+ }
+ (void) setsockopt(s, SOL_SOCKET, SO_REUSEADDR, &on, sizeof(on));
+ if (bind(s, (struct sockaddr *)&sn, sizeof(sn)) < 0) {
+ perror("bind");
+ exit(1);
+ }
+ if (listen(s, 1) < 0) {
+ perror("listen");
+ exit(1);
+ }
+ foo = sizeof(sn);
+ ns = accept(s, (struct sockaddr *)&sn, &foo);
+ if (ns < 0) {
+ perror("accept");
+ exit(1);
+ }
+ (void) dup2(ns, 0);
+ (void) close(ns);
+ (void) close(s);
+ } else if (argc > 0) {
+ usage();
+ /* NOT REACHED */
+ }
+
+ openlog("telnetd", LOG_PID | LOG_ODELAY, LOG_DAEMON);
+ fromlen = sizeof (from);
+ if (getpeername(0, (struct sockaddr *)&from, &fromlen) < 0) {
+ fprintf(stderr, "%s: ", progname);
+ perror("getpeername");
+ _exit(1);
+ }
+ if (keepalive &&
+ setsockopt(0, SOL_SOCKET, SO_KEEPALIVE, &on, sizeof (on)) < 0) {
+ syslog(LOG_WARNING, "setsockopt (SO_KEEPALIVE): %m");
+ }
+
+#if defined(HAS_IPPROTO_IP) && defined(IP_TOS)
+ {
+# if defined(HAS_GETTOS)
+ struct tosent *tp;
+ if (tos < 0 && (tp = gettosbyname("telnet", "tcp")))
+ tos = tp->t_tos;
+# endif
+ if (tos < 0)
+ tos = 020; /* Low Delay bit */
+ if (tos
+ && (setsockopt(0, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) < 0)
+ && (errno != ENOPROTOOPT) )
+ syslog(LOG_WARNING, "setsockopt (IP_TOS): %m");
+ }
+#endif /* defined(HAS_IPPROTO_IP) && defined(IP_TOS) */
+ net = 0;
+ doit(&from);
+ /* NOTREACHED */
+ return 0;
+} /* end of main */
+
+void
+usage(void)
+{
+ fprintf(stderr, "Usage: telnetd");
+#ifdef AUTHENTICATE
+ fprintf(stderr, " [-a (debug|other|user|valid|off)]\n\t");
+#endif
+#ifdef BFTPDAEMON
+ fprintf(stderr, " [-B]");
+#endif
+ fprintf(stderr, " [-debug]");
+#ifdef DIAGNOSTICS
+ fprintf(stderr, " [-D (options|report|exercise|netdata|ptydata)]\n\t");
+#endif
+#ifdef AUTHENTICATE
+ fprintf(stderr, " [-edebug]");
+#endif
+ fprintf(stderr, " [-h]");
+#ifdef LINEMODE
+ fprintf(stderr, " [-l]");
+#endif
+ fprintf(stderr, " [-L login_program]");
+ fprintf(stderr, " [-n]");
+#ifdef SecurID
+ fprintf(stderr, " [-s]");
+#endif
+#ifdef AUTHENTICATE
+ fprintf(stderr, " [-X auth-type]");
+#endif
+ fprintf(stderr, " [port]\n");
+ exit(1);
+}
+
+/*
+ * getterminaltype
+ *
+ * Ask the other end to send along its terminal type and speed.
+ * Output is the variable terminaltype filled in.
+ */
+
+static void _gettermname(void);
+
+static
+int
+getterminaltype(char *name)
+{
+ int retval = -1;
+ (void)name;
+
+ settimer(baseline);
+#if defined(AUTHENTICATE)
+ /*
+ * Handle the Authentication option before we do anything else.
+ */
+ send_do(TELOPT_AUTHENTICATION, 1);
+ while (his_will_wont_is_changing(TELOPT_AUTHENTICATION))
+ ttloop();
+ if (his_state_is_will(TELOPT_AUTHENTICATION)) {
+ retval = auth_wait(name);
+ }
+#endif
+
+#if defined(ENCRYPT)
+ send_will(TELOPT_ENCRYPT, 1);
+#endif
+ send_do(TELOPT_TTYPE, 1);
+ send_do(TELOPT_TSPEED, 1);
+ send_do(TELOPT_XDISPLOC, 1);
+ send_do(TELOPT_ENVIRON, 1);
+ while (
+#if defined(ENCRYPT)
+ his_do_dont_is_changing(TELOPT_ENCRYPT) ||
+#endif
+ his_will_wont_is_changing(TELOPT_TTYPE) ||
+ his_will_wont_is_changing(TELOPT_TSPEED) ||
+ his_will_wont_is_changing(TELOPT_XDISPLOC) ||
+ his_will_wont_is_changing(TELOPT_ENVIRON)) {
+ ttloop();
+ }
+#if defined(ENCRYPT)
+ /*
+ * Wait for the negotiation of what type of encryption we can
+ * send with. If autoencrypt is not set, this will just return.
+ */
+ if (his_state_is_will(TELOPT_ENCRYPT)) {
+ encrypt_wait();
+ }
+#endif
+ if (his_state_is_will(TELOPT_TSPEED)) {
+ netoprintf("%c%c%c%c%c%c",
+ IAC, SB, TELOPT_TSPEED, TELQUAL_SEND, IAC, SE);
+ }
+ if (his_state_is_will(TELOPT_XDISPLOC)) {
+ netoprintf("%c%c%c%c%c%c",
+ IAC, SB, TELOPT_XDISPLOC, TELQUAL_SEND, IAC, SE);
+ }
+ if (his_state_is_will(TELOPT_ENVIRON)) {
+ netoprintf("%c%c%c%c%c%c",
+ IAC, SB, TELOPT_ENVIRON, TELQUAL_SEND, IAC, SE);
+ }
+ if (his_state_is_will(TELOPT_TTYPE)) {
+ netoprintf("%c%c%c%c%c%c",
+ IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE);
+ }
+ if (his_state_is_will(TELOPT_TSPEED)) {
+ while (sequenceIs(tspeedsubopt, baseline))
+ ttloop();
+ }
+ if (his_state_is_will(TELOPT_XDISPLOC)) {
+ while (sequenceIs(xdisplocsubopt, baseline))
+ ttloop();
+ }
+ if (his_state_is_will(TELOPT_ENVIRON)) {
+ while (sequenceIs(environsubopt, baseline))
+ ttloop();
+ }
+ if (his_state_is_will(TELOPT_TTYPE)) {
+ char first[256], last[256];
+
+ while (sequenceIs(ttypesubopt, baseline))
+ ttloop();
+
+ /*
+ * If the other side has already disabled the option, then
+ * we have to just go with what we (might) have already gotten.
+ */
+ if (his_state_is_will(TELOPT_TTYPE) && !terminaltypeok(terminaltype)) {
+ /*
+ * Due to state.c, terminaltype points to a static char[41].
+ * Therefore, this assert cannot fail, and therefore, strings
+ * arising from "terminaltype" can be safely strcpy'd into
+ * first[] or last[].
+ */
+ assert(strlen(terminaltype) < sizeof(first));
+
+ strcpy(first, terminaltype);
+
+ for(;;) {
+ /*
+ * Save the unknown name, and request the next name.
+ */
+ strcpy(last, terminaltype);
+
+ _gettermname();
+ assert(strlen(terminaltype) < sizeof(first));
+
+ if (terminaltypeok(terminaltype))
+ break;
+
+ if (!strcmp(last, terminaltype) ||
+ his_state_is_wont(TELOPT_TTYPE)) {
+ /*
+ * We've hit the end. If this is the same as
+ * the first name, just go with it.
+ */
+ if (!strcmp(first, terminaltype))
+ break;
+ /*
+ * Get the terminal name one more time, so that
+ * RFC1091 compliant telnets will cycle back to
+ * the start of the list.
+ */
+ _gettermname();
+ assert(strlen(terminaltype) < sizeof(first));
+
+ if (strcmp(first, terminaltype)) {
+ /*
+ * first[] came from terminaltype, so it must fit
+ * back in.
+ */
+ strcpy(terminaltype, first);
+ }
+ break;
+ }
+ }
+ }
+ }
+ return(retval);
+} /* end of getterminaltype */
+
+static
+void
+_gettermname(void)
+{
+ /*
+ * If the client turned off the option,
+ * we can't send another request, so we
+ * just return.
+ */
+ if (his_state_is_wont(TELOPT_TTYPE))
+ return;
+
+ settimer(baseline);
+ netoprintf("%c%c%c%c%c%c", IAC, SB, TELOPT_TTYPE, TELQUAL_SEND, IAC, SE);
+ while (sequenceIs(ttypesubopt, baseline))
+ ttloop();
+}
+
+static int
+terminaltypeok(const char *s)
+{
+ /* char buf[2048]; */
+
+ if (terminaltype == NULL)
+ return(1);
+
+ /*
+ * Fix from Chris Evans: if it has a / in it, termcap will
+ * treat it as a filename. Oops.
+ */
+ if (strchr(s, '/')) {
+ return 0;
+ }
+
+ /*
+ * If it's absurdly long, accept it without asking termcap.
+ *
+ * This means that it won't get seen again until after login,
+ * at which point exploiting buffer problems in termcap doesn't
+ * gain one anything.
+ *
+ * It's possible this limit ought to be raised to 128, but nothing
+ * in my termcap is more than 64, 64 is _plenty_ for most, and while
+ * buffers aren't likely to be smaller than 64, they might be 80 and
+ * thus less than 128.
+ */
+ if (strlen(s) > 63) {
+ return 0;
+ }
+
+ /*
+ * tgetent() will return 1 if the type is known, and
+ * 0 if it is not known. If it returns -1, it couldn't
+ * open the database. But if we can't open the database,
+ * it won't help to say we failed, because we won't be
+ * able to verify anything else. So, we treat -1 like 1.
+ */
+
+ /*
+ * Don't do this - tgetent is not really trustworthy. Assume
+ * the terminal type is one we know; terminal types are pretty
+ * standard now. And if it isn't, it's unlikely we're going to
+ * know anything else the remote telnet might send as an alias
+ * for it.
+ *
+ * if (tgetent(buf, s) == 0)
+ * return(0);
+ */
+ return(1);
+}
+
+#ifndef MAXHOSTNAMELEN
+#define MAXHOSTNAMELEN 64
+#endif /* MAXHOSTNAMELEN */
+
+char host_name[MAXHOSTNAMELEN];
+char remote_host_name[MAXHOSTNAMELEN];
+
+extern void telnet(int, int);
+
+/*
+ * Get a pty, scan input lines.
+ */
+static void
+doit(struct sockaddr_in *who)
+{
+ const char *host;
+ struct hostent *hp;
+ int level;
+ char user_name[256];
+
+ /*
+ * Find an available pty to use.
+ */
+ pty = getpty();
+ if (pty < 0)
+ fatal(net, "All network ports in use");
+
+ /* get name of connected client */
+ hp = gethostbyaddr((char *)&who->sin_addr, sizeof (struct in_addr),
+ who->sin_family);
+ if (hp)
+ host = hp->h_name;
+ else
+ host = inet_ntoa(who->sin_addr);
+
+ /*
+ * We must make a copy because Kerberos is probably going
+ * to also do a gethost* and overwrite the static data...
+ */
+ {
+ int i;
+ strncpy(remote_host_name, host, sizeof(remote_host_name)-1);
+ remote_host_name[sizeof(remote_host_name)-1] = 0;
+
+ /* Disallow funnies. */
+ for (i=0; remote_host_name[i]; i++) {
+ if (remote_host_name[i]<=32 || remote_host_name[i]>126)
+ remote_host_name[i] = '?';
+ }
+ }
+ host = remote_host_name;
+
+ /* Get local host name */
+ {
+ struct hostent *h;
+ gethostname(host_name, sizeof(host_name));
+ h = gethostbyname(host_name);
+ if (h) {
+ strncpy(host_name, h->h_name, sizeof(host_name));
+ host_name[sizeof(host_name)-1] = 0;
+ }
+ }
+
+#if defined(AUTHENTICATE) || defined(ENCRYPT)
+ auth_encrypt_init(host_name, host, "TELNETD", 1);
+#endif
+
+ init_env();
+ /*
+ * get terminal type.
+ */
+ *user_name = 0;
+ level = getterminaltype(user_name);
+ setenv("TERM", terminaltype ? terminaltype : "network", 1);
+
+ /* TODO list stuff provided by Laszlo Vecsey <master@internexus.net> */
+
+ /*
+ * Set REMOTEHOST environment variable
+ */
+ setproctitle("%s", host);
+ setenv("REMOTEHOST", host, 0);
+
+ /*
+ * Start up the login process on the slave side of the terminal
+ */
+ startslave(host, level, user_name);
+
+ telnet(net, pty); /* begin server processing */
+
+ /*NOTREACHED*/
+} /* end of doit */
+
+/*
+ * Main loop. Select from pty and network, and
+ * hand data to telnet receiver finite state machine.
+ */
+void telnet(int f, int p)
+{
+ int on = 1;
+ char *HE;
+ const char *IM;
+
+ /*
+ * Initialize the slc mapping table.
+ */
+ get_slc_defaults();
+
+ /*
+ * Do some tests where it is desireable to wait for a response.
+ * Rather than doing them slowly, one at a time, do them all
+ * at once.
+ */
+ if (my_state_is_wont(TELOPT_SGA))
+ send_will(TELOPT_SGA, 1);
+ /*
+ * Is the client side a 4.2 (NOT 4.3) system? We need to know this
+ * because 4.2 clients are unable to deal with TCP urgent data.
+ *
+ * To find out, we send out a "DO ECHO". If the remote system
+ * answers "WILL ECHO" it is probably a 4.2 client, and we note
+ * that fact ("WILL ECHO" ==> that the client will echo what
+ * WE, the server, sends it; it does NOT mean that the client will
+ * echo the terminal input).
+ */
+ send_do(TELOPT_ECHO, 1);
+
+#ifdef LINEMODE
+ if (his_state_is_wont(TELOPT_LINEMODE)) {
+ /*
+ * Query the peer for linemode support by trying to negotiate
+ * the linemode option.
+ */
+ linemode = 0;
+ editmode = 0;
+ send_do(TELOPT_LINEMODE, 1); /* send do linemode */
+ }
+#endif /* LINEMODE */
+
+ /*
+ * Send along a couple of other options that we wish to negotiate.
+ */
+ send_do(TELOPT_NAWS, 1);
+ send_will(TELOPT_STATUS, 1);
+ flowmode = 1; /* default flow control state */
+ send_do(TELOPT_LFLOW, 1);
+
+ /*
+ * Spin, waiting for a response from the DO ECHO. However,
+ * some REALLY DUMB telnets out there might not respond
+ * to the DO ECHO. So, we spin looking for NAWS, (most dumb
+ * telnets so far seem to respond with WONT for a DO that
+ * they don't understand...) because by the time we get the
+ * response, it will already have processed the DO ECHO.
+ * Kludge upon kludge.
+ */
+ while (his_will_wont_is_changing(TELOPT_NAWS)) {
+ ttloop();
+ }
+
+ /*
+ * But...
+ * The client might have sent a WILL NAWS as part of its
+ * startup code; if so, we'll be here before we get the
+ * response to the DO ECHO. We'll make the assumption
+ * that any implementation that understands about NAWS
+ * is a modern enough implementation that it will respond
+ * to our DO ECHO request; hence we'll do another spin
+ * waiting for the ECHO option to settle down, which is
+ * what we wanted to do in the first place...
+ */
+ if (his_want_state_is_will(TELOPT_ECHO) &&
+ his_state_is_will(TELOPT_NAWS)) {
+ while (his_will_wont_is_changing(TELOPT_ECHO))
+ ttloop();
+ }
+ /*
+ * On the off chance that the telnet client is broken and does not
+ * respond to the DO ECHO we sent, (after all, we did send the
+ * DO NAWS negotiation after the DO ECHO, and we won't get here
+ * until a response to the DO NAWS comes back) simulate the
+ * receipt of a will echo. This will also send a WONT ECHO
+ * to the client, since we assume that the client failed to
+ * respond because it believes that it is already in DO ECHO
+ * mode, which we do not want.
+ */
+ if (his_want_state_is_will(TELOPT_ECHO)) {
+ DIAG(TD_OPTIONS, netoprintf("td: simulating recv\r\n"););
+ willoption(TELOPT_ECHO);
+ }
+
+ /*
+ * Finally, to clean things up, we turn on our echo. This
+ * will break stupid 4.2 telnets out of local terminal echo.
+ */
+
+ if (my_state_is_wont(TELOPT_ECHO))
+ send_will(TELOPT_ECHO, 1);
+
+ /*
+ * Turn on packet mode
+ */
+ ioctl(p, TIOCPKT, (char *)&on);
+#if defined(LINEMODE) && defined(KLUDGELINEMODE)
+ /*
+ * Continuing line mode support. If client does not support
+ * real linemode, attempt to negotiate kludge linemode by sending
+ * the do timing mark sequence.
+ */
+ if (lmodetype < REAL_LINEMODE)
+ send_do(TELOPT_TM, 1);
+#endif /* defined(LINEMODE) && defined(KLUDGELINEMODE) */
+
+ /*
+ * Call telrcv() once to pick up anything received during
+ * terminal type negotiation, 4.2/4.3 determination, and
+ * linemode negotiation.
+ */
+ telrcv();
+
+ ioctl(f, FIONBIO, (char *)&on);
+ ioctl(p, FIONBIO, (char *)&on);
+
+#if defined(SO_OOBINLINE)
+ setsockopt(net, SOL_SOCKET, SO_OOBINLINE, &on, sizeof on);
+#endif /* defined(SO_OOBINLINE) */
+
+#ifdef SIGTSTP
+ signal(SIGTSTP, SIG_IGN);
+#endif
+#ifdef SIGTTOU
+ /*
+ * Ignoring SIGTTOU keeps the kernel from blocking us
+ * in ttioct() in /sys/tty.c.
+ */
+ signal(SIGTTOU, SIG_IGN);
+#endif
+
+ signal(SIGCHLD, cleanup);
+
+#ifdef TIOCNOTTY
+ {
+ register int t;
+ t = open(_PATH_TTY, O_RDWR);
+ if (t >= 0) {
+ (void) ioctl(t, TIOCNOTTY, (char *)0);
+ (void) close(t);
+ }
+ }
+#endif
+
+ /*
+ * Show banner that getty never gave.
+ *
+ * We put the banner in the pty input buffer. This way, it
+ * gets carriage return null processing, etc., just like all
+ * other pty --> client data.
+ */
+
+ if (getenv("USER"))
+ hostinfo = 0;
+
+ IM = DEFAULT_IM;
+ HE = 0;
+
+ edithost(HE, host_name);
+ if (hostinfo && *IM)
+ putf(IM, ptyibuf2);
+
+ if (pcc) strncat(ptyibuf2, ptyip, pcc+1);
+ ptyip = ptyibuf2;
+ pcc = strlen(ptyip);
+#ifdef LINEMODE
+ /*
+ * Last check to make sure all our states are correct.
+ */
+ init_termbuf();
+ localstat();
+#endif /* LINEMODE */
+
+ DIAG(TD_REPORT, netoprintf("td: Entering processing loop\r\n"););
+
+ for (;;) {
+ fd_set ibits, obits, xbits;
+ int c, hifd;
+
+ if (ncc < 0 && pcc < 0)
+ break;
+
+ FD_ZERO(&ibits);
+ FD_ZERO(&obits);
+ FD_ZERO(&xbits);
+ hifd=0;
+ /*
+ * Never look for input if there's still
+ * stuff in the corresponding output buffer
+ */
+ if (nfrontp - nbackp || pcc > 0) {
+ FD_SET(f, &obits);
+ if (f >= hifd) hifd = f+1;
+ }
+ else {
+ FD_SET(p, &ibits);
+ if (p >= hifd) hifd = p+1;
+ }
+ if (pfrontp - pbackp || ncc > 0) {
+ FD_SET(p, &obits);
+ if (p >= hifd) hifd = p+1;
+ }
+ else {
+ FD_SET(f, &ibits);
+ if (f >= hifd) hifd = f+1;
+ }
+ if (!SYNCHing) {
+ FD_SET(f, &xbits);
+ if (f >= hifd) hifd = f+1;
+ }
+ if ((c = select(hifd, &ibits, &obits, &xbits,
+ (struct timeval *)0)) < 1) {
+ if (c == -1) {
+ if (errno == EINTR) {
+ continue;
+ }
+ }
+ sleep(5);
+ continue;
+ }
+
+ /*
+ * Any urgent data?
+ */
+ if (FD_ISSET(net, &xbits)) {
+ SYNCHing = 1;
+ }
+
+ /*
+ * Something to read from the network...
+ */
+ if (FD_ISSET(net, &ibits)) {
+#if !defined(SO_OOBINLINE)
+ /*
+ * In 4.2 (and 4.3 beta) systems, the
+ * OOB indication and data handling in the kernel
+ * is such that if two separate TCP Urgent requests
+ * come in, one byte of TCP data will be overlaid.
+ * This is fatal for Telnet, but we try to live
+ * with it.
+ *
+ * In addition, in 4.2 (and...), a special protocol
+ * is needed to pick up the TCP Urgent data in
+ * the correct sequence.
+ *
+ * What we do is: if we think we are in urgent
+ * mode, we look to see if we are "at the mark".
+ * If we are, we do an OOB receive. If we run
+ * this twice, we will do the OOB receive twice,
+ * but the second will fail, since the second
+ * time we were "at the mark", but there wasn't
+ * any data there (the kernel doesn't reset
+ * "at the mark" until we do a normal read).
+ * Once we've read the OOB data, we go ahead
+ * and do normal reads.
+ *
+ * There is also another problem, which is that
+ * since the OOB byte we read doesn't put us
+ * out of OOB state, and since that byte is most
+ * likely the TELNET DM (data mark), we would
+ * stay in the TELNET SYNCH (SYNCHing) state.
+ * So, clocks to the rescue. If we've "just"
+ * received a DM, then we test for the
+ * presence of OOB data when the receive OOB
+ * fails (and AFTER we did the normal mode read
+ * to clear "at the mark").
+ */
+ if (SYNCHing) {
+ int atmark;
+
+ ioctl(net, SIOCATMARK, (char *)&atmark);
+ if (atmark) {
+ ncc = recv(net, netibuf, sizeof (netibuf), MSG_OOB);
+ if ((ncc == -1) && (errno == EINVAL)) {
+ ncc = read(net, netibuf, sizeof (netibuf));
+ if (sequenceIs(didnetreceive, gotDM)) {
+ SYNCHing = stilloob(net);
+ }
+ }
+ }
+ else {
+ ncc = read(net, netibuf, sizeof (netibuf));
+ }
+ }
+ else {
+ ncc = read(net, netibuf, sizeof (netibuf));
+ }
+ settimer(didnetreceive);
+#else /* !defined(SO_OOBINLINE)) */
+ ncc = read(net, netibuf, sizeof (netibuf));
+#endif /* !defined(SO_OOBINLINE)) */
+ if (ncc < 0 && errno == EWOULDBLOCK)
+ ncc = 0;
+ else {
+ if (ncc <= 0) {
+ break;
+ }
+ netip = netibuf;
+ }
+ DIAG((TD_REPORT | TD_NETDATA),
+ netoprintf("td: netread %d chars\r\n", ncc););
+ DIAG(TD_NETDATA, printdata("nd", netip, ncc));
+ }
+
+ /*
+ * Something to read from the pty...
+ */
+ if (FD_ISSET(p, &ibits)) {
+ pcc = read(p, ptyibuf, BUFSIZ);
+ /*
+ * On some systems, if we try to read something
+ * off the master side before the slave side is
+ * opened, we get EIO.
+ */
+ if (pcc < 0 && (errno == EWOULDBLOCK || errno == EIO)) {
+ pcc = 0;
+ }
+ else {
+ if (pcc <= 0)
+ break;
+#ifdef LINEMODE
+ /*
+ * If ioctl from pty, pass it through net
+ */
+ if (ptyibuf[0] & TIOCPKT_IOCTL) {
+ copy_termbuf(ptyibuf+1, pcc-1);
+ localstat();
+ pcc = 1;
+ }
+#endif /* LINEMODE */
+ if (ptyibuf[0] & TIOCPKT_FLUSHWRITE) {
+ netclear(); /* clear buffer back */
+#ifndef NO_URGENT
+ /*
+ * There are client telnets on some
+ * operating systems get screwed up
+ * royally if we send them urgent
+ * mode data.
+ */
+ netoprintf("%c%c", IAC, DM);
+ neturg = nfrontp-1; /* off by one XXX */
+#endif
+ }
+ if (his_state_is_will(TELOPT_LFLOW) &&
+ (ptyibuf[0] &
+ (TIOCPKT_NOSTOP|TIOCPKT_DOSTOP))) {
+ netoprintf("%c%c%c%c%c%c",
+ IAC, SB, TELOPT_LFLOW,
+ ptyibuf[0] & TIOCPKT_DOSTOP ? 1 : 0,
+ IAC, SE);
+ }
+ pcc--;
+ ptyip = ptyibuf+1;
+ }
+ }
+
+ while (pcc > 0) {
+ if ((&netobuf[BUFSIZ] - nfrontp) < 2)
+ break;
+ c = *ptyip++ & 0377, pcc--;
+ if (c == IAC)
+ *nfrontp++ = c;
+ *nfrontp++ = c;
+ if ((c == '\r' ) && (my_state_is_wont(TELOPT_BINARY))) {
+ if (pcc > 0 && ((*ptyip & 0377) == '\n')) {
+ *nfrontp++ = *ptyip++ & 0377;
+ pcc--;
+ }
+ else *nfrontp++ = '\0';
+ }
+ }
+
+ if (FD_ISSET(f, &obits) && (nfrontp - nbackp) > 0)
+ netflush();
+ if (ncc > 0)
+ telrcv();
+ if (FD_ISSET(p, &obits) && (pfrontp - pbackp) > 0)
+ ptyflush();
+ }
+ cleanup(0);
+} /* end of telnet */
+
+#ifndef TCSIG
+# ifdef TIOCSIG
+# define TCSIG TIOCSIG
+# endif
+#endif
+
+/*
+ * Send interrupt to process on other side of pty.
+ * If it is in raw mode, just write NULL;
+ * otherwise, write intr char.
+ */
+void interrupt(void) {
+ ptyflush(); /* half-hearted */
+
+#ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGINT);
+#else /* TCSIG */
+ init_termbuf();
+ *pfrontp++ = slctab[SLC_IP].sptr ?
+ (unsigned char)*slctab[SLC_IP].sptr : '\177';
+#endif /* TCSIG */
+}
+
+/*
+ * Send quit to process on other side of pty.
+ * If it is in raw mode, just write NULL;
+ * otherwise, write quit char.
+ */
+void sendbrk(void) {
+ ptyflush(); /* half-hearted */
+#ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGQUIT);
+#else /* TCSIG */
+ init_termbuf();
+ *pfrontp++ = slctab[SLC_ABORT].sptr ?
+ (unsigned char)*slctab[SLC_ABORT].sptr : '\034';
+#endif /* TCSIG */
+}
+
+void sendsusp(void) {
+#ifdef SIGTSTP
+ ptyflush(); /* half-hearted */
+# ifdef TCSIG
+ (void) ioctl(pty, TCSIG, (char *)SIGTSTP);
+# else /* TCSIG */
+ *pfrontp++ = slctab[SLC_SUSP].sptr ?
+ (unsigned char)*slctab[SLC_SUSP].sptr : '\032';
+# endif /* TCSIG */
+#endif /* SIGTSTP */
+}
+
+/*
+ * When we get an AYT, if ^T is enabled, use that. Otherwise,
+ * just send back "[Yes]".
+ */
+void recv_ayt(void) {
+#if defined(SIGINFO) && defined(TCSIG)
+ if (slctab[SLC_AYT].sptr && *slctab[SLC_AYT].sptr != _POSIX_VDISABLE) {
+ (void) ioctl(pty, TCSIG, (char *)SIGINFO);
+ return;
+ }
+#endif
+ netoprintf("\r\n[Yes]\r\n");
+}
+
+void doeof(void) {
+ init_termbuf();
+
+#if defined(LINEMODE) && (VEOF == VMIN)
+ if (!tty_isediting()) {
+ extern char oldeofc;
+ *pfrontp++ = oldeofc;
+ return;
+ }
+#endif
+ *pfrontp++ = slctab[SLC_EOF].sptr ?
+ (unsigned char)*slctab[SLC_EOF].sptr : '\004';
+}
Index: utility.c
===================================================================
--- utility.c (nonexistent)
+++ utility.c (revision 5)
@@ -0,0 +1,1153 @@
+/*
+ * Copyright (c) 1989 Regents of the University of California.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ * notice, this list of conditions and the following disclaimer in the
+ * documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ * must display the following acknowledgement:
+ * This product includes software developed by the University of
+ * California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ * may be used to endorse or promote products derived from this software
+ * without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+/*
+ * From: @(#)utility.c 5.8 (Berkeley) 3/22/91
+ */
+char util_rcsid[] =
+ "$Id: utility.c,v 1.11 1999/12/12 14:59:45 dholland Exp $";
+
+#define PRINTOPTIONS
+
+#include <stdarg.h>
+#include <sys/utsname.h>
+#include <time.h>
+
+#ifdef AUTHENTICATE
+#include <libtelnet/auth.h>
+#endif
+
+#include "telnetd.h"
+
+/*
+ * utility functions performing io related tasks
+ */
+
+void
+netoprintf(const char *fmt, ...)
+{
+ int len = 0, maxsize;
+ va_list ap;
+ int done=0;
+
+ while (!done) {
+ maxsize = sizeof(netobuf) - (nfrontp - netobuf);
+ if (maxsize < 0) {
+ /* no way this is gonna fit - try to flush some */
+ netflush();
+ maxsize = sizeof(netobuf) - (nfrontp - netobuf);
+ if (maxsize < 0)
+ break;
+ }
+
+ va_start(ap, fmt);
+ len = vsnprintf(nfrontp, maxsize, fmt, ap);
+ va_end(ap);
+
+ if (len<=0 || len==maxsize) {
+ /* didn't fit */
+ netflush();
+ }
+ else {
+ done = 1;
+ }
+ }
+ nfrontp += len;
+}
+
+/*
+ * 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(void)
+{
+
+ DIAG(TD_REPORT, netoprintf("td: ttloop\r\n"););
+
+ if (nfrontp-nbackp) {
+ netflush();
+ }
+ ncc = read(net, netibuf, sizeof(netibuf));
+ if (ncc < 0) {
+ syslog(LOG_INFO, "ttloop: read: %m\n");
+ exit(1);
+ } else if (ncc == 0) {
+ syslog(LOG_INFO, "ttloop: peer died: EOF\n");
+ exit(1);
+ }
+ DIAG(TD_REPORT, netoprintf("td: ttloop read %d chars\r\n", ncc););
+ netip = netibuf;
+ telrcv(); /* state machine */
+ if (ncc > 0) {
+ pfrontp = pbackp = ptyobuf;
+ telrcv();
+ }
+} /* end of ttloop */
+
+/*
+ * Check a descriptor to see if out of band data exists on it.
+ */
+int stilloob(int s) /* socket number */
+{
+ static struct timeval timeout = { 0, 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;
+ }
+}
+
+void ptyflush(void)
+{
+ int n;
+
+ if ((n = pfrontp - pbackp) > 0) {
+ DIAG((TD_REPORT | TD_PTYDATA),
+ netoprintf("td: ptyflush %d chars\r\n", n););
+ DIAG(TD_PTYDATA, printdata("pd", pbackp, n));
+ n = write(pty, pbackp, n);
+ }
+ if (n < 0) {
+ if (errno == EWOULDBLOCK || errno == EINTR)
+ return;
+ cleanup(0);
+ }
+ pbackp += n;
+ if (pbackp == pfrontp)
+ pbackp = pfrontp = ptyobuf;
+}
+
+/*
+ * 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.
+ */
+static
+char *
+nextitem(char *current)
+{
+ 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;
+ }
+} /* end of nextitem */
+
+
+/*
+ * 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.
+ */
+void netclear(void)
+{
+ register char *thisitem, *next;
+ char *good;
+#define wewant(p) ((nfrontp > p) && ((*p&0xff) == IAC) && \
+ ((*(p+1)&0xff) != EC) && ((*(p+1)&0xff) != EL))
+
+#if defined(ENCRYPT)
+ thisitem = nclearto > netobuf ? nclearto : netobuf;
+#else
+ thisitem = netobuf;
+#endif
+
+ while ((next = nextitem(thisitem)) <= nbackp) {
+ thisitem = next;
+ }
+
+ /* Now, thisitem is first before/at boundary. */
+
+#if defined(ENCRYPT)
+ good = nclearto > netobuf ? nclearto : netobuf;
+#else
+ good = netobuf; /* where the good bytes go */
+#endif
+
+ 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;
+} /* end of netclear */
+
+/*
+ * netflush
+ * Send as much data as possible to the network,
+ * handling requests for urgent data.
+ */
+extern int not42;
+void
+netflush(void)
+{
+ int n;
+
+ if ((n = nfrontp - nbackp) > 0) {
+ DIAG(TD_REPORT,
+ { netoprintf("td: netflush %d chars\r\n", n);
+ n = nfrontp - nbackp; /* update count */
+ });
+#if defined(ENCRYPT)
+ if (encrypt_output) {
+ char *s = nclearto ? nclearto : nbackp;
+ if (nfrontp - s > 0) {
+ (*encrypt_output)((unsigned char *)s, nfrontp-s);
+ nclearto = nfrontp;
+ }
+ }
+#endif
+ /*
+ * 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 || errno == EINTR)
+ return;
+ cleanup(0);
+ }
+ nbackp += n;
+#if defined(ENCRYPT)
+ if (nbackp > nclearto)
+ nclearto = 0;
+#endif
+ if (nbackp >= neturg) {
+ neturg = 0;
+ }
+ if (nbackp == nfrontp) {
+ nbackp = nfrontp = netobuf;
+#if defined(ENCRYPT)
+ nclearto = 0;
+#endif
+ }
+ return;
+} /* end of netflush */
+
+
+/*
+ * writenet
+ *
+ * Just a handy little function to write a bit of raw data to the net.
+ * It will force a transmit of the buffer if necessary
+ *
+ * arguments
+ * ptr - A pointer to a character string to write
+ * len - How many bytes to write
+ */
+void writenet(register unsigned char *ptr, register int len)
+{
+ /* flush buffer if no room for new data) */
+ if ((&netobuf[BUFSIZ] - nfrontp) < len) {
+ /* if this fails, don't worry, buffer is a little big */
+ netflush();
+ }
+
+ bcopy(ptr, nfrontp, len);
+ nfrontp += len;
+
+} /* end of writenet */
+
+
+/*
+ * miscellaneous functions doing a variety of little jobs follow ...
+ */
+
+
+void
+fatal(int f, const char *msg)
+{
+ char buf[BUFSIZ];
+
+ (void) snprintf(buf, sizeof(buf), "telnetd: %s.\r\n", msg);
+#if defined(ENCRYPT)
+ if (encrypt_output) {
+ /*
+ * Better turn off encryption first....
+ * Hope it flushes...
+ */
+ encrypt_send_end();
+ netflush();
+ }
+#endif
+ (void) write(f, buf, (int)strlen(buf));
+ sleep(1); /*XXX*/
+ exit(1);
+}
+
+void
+fatalperror(int f, const char *msg)
+{
+ char buf[BUFSIZ];
+ snprintf(buf, sizeof(buf), "%s: %s\r\n", msg, strerror(errno));
+ fatal(f, buf);
+}
+
+char editedhost[32];
+struct utsname kerninfo;
+
+void
+edithost(const char *pat, const char *host)
+{
+ char *res = editedhost;
+
+ uname(&kerninfo);
+
+ 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 (*host)
+ (void) strncpy(res, host,
+ sizeof editedhost - (res - editedhost) -1);
+ else
+ *res = '\0';
+ editedhost[sizeof editedhost - 1] = '\0';
+}
+
+static char *putlocation;
+
+static
+void
+putstr(const char *s)
+{
+ while (*s) putchr(*s++);
+}
+
+void putchr(int cc)
+{
+ *putlocation++ = cc;
+}
+
+static char fmtstr[] = { "%H:%M on %A, %d %B %Y" };
+
+void putf(const char *cp, char *where)
+{
+ char *slash;
+ time_t t;
+ char db[100];
+
+ if (where)
+ putlocation = where;
+
+ while (*cp) {
+ if (*cp != '%') {
+ putchr(*cp++);
+ continue;
+ }
+ switch (*++cp) {
+
+ case 't':
+ slash = strrchr(line, '/');
+ if (slash == NULL)
+ putstr(line);
+ else
+ putstr(slash+1);
+ break;
+
+ case 'h':
+ putstr(editedhost);
+ break;
+
+ case 'd':
+ (void)time(&t);
+ (void)strftime(db, sizeof(db), fmtstr, localtime(&t));
+ putstr(db);
+ break;
+
+ case '%':
+ putchr('%');
+ break;
+
+ case 'D':
+ {
+ char buff[128];
+
+ if (getdomainname(buff,sizeof(buff)) < 0
+ || buff[0] == '\0'
+ || strcmp(buff, "(none)") == 0)
+ break;
+ putstr(buff);
+ }
+ break;
+
+ case 'i':
+ {
+ char buff[3];
+ FILE *fp;
+ int p, c;
+
+ if ((fp = fopen(ISSUE_FILE, "r")) == NULL)
+ break;
+ p = '\n';
+ while ((c = fgetc(fp)) != EOF) {
+ if (p == '\n' && c == '#') {
+ do {
+ c = fgetc(fp);
+ } while (c != EOF && c != '\n');
+ continue;
+ } else if (c == '%') {
+ buff[0] = c;
+ c = fgetc(fp);
+ if (c == EOF) break;
+ buff[1] = c;
+ buff[2] = '\0';
+ putf(buff, NULL);
+ } else {
+ if (c == '\n') putchr('\r');
+ putchr(c);
+ p = c;
+ }
+ };
+ (void) fclose(fp);
+ }
+ return; /* ignore remainder of the banner string */
+ /*NOTREACHED*/
+
+ case 's':
+ putstr(kerninfo.sysname);
+ break;
+
+ case 'm':
+ putstr(kerninfo.machine);
+ break;
+
+ case 'r':
+ putstr(kerninfo.release);
+ break;
+
+ case 'v':
+#ifdef __linux__
+ putstr(kerninfo.version);
+#else
+ puts(kerninfo.version);
+#endif
+ break;
+ }
+ cp++;
+ }
+}
+
+#ifdef DIAGNOSTICS
+/*
+ * Print telnet options and commands in plain text, if possible.
+ */
+void
+printoption(const char *fmt, int option)
+{
+ if (TELOPT_OK(option))
+ netoprintf("%s %s\r\n", fmt, TELOPT(option));
+ else if (TELCMD_OK(option))
+ netoprintf("%s %s\r\n", fmt, TELCMD(option));
+ else
+ netoprintf("%s %d\r\n", fmt, option);
+}
+
+/* direction: '<' or '>' */
+/* pointer: where suboption data sits */
+/* length: length of suboption data */
+void
+printsub(char direction, unsigned char *pointer, int length)
+{
+ register int i = -1;
+#ifdef AUTHENTICATE
+ char buf[512];
+#endif
+
+ if (!(diagnostic & TD_OPTIONS))
+ return;
+
+ if (direction) {
+ netoprintf("td: %s suboption ",
+ direction == '<' ? "recv" : "send");
+ if (length >= 3) {
+ register int j;
+
+ i = pointer[length-2];
+ j = pointer[length-1];
+
+ if (i != IAC || j != SE) {
+ netoprintf("(terminated by ");
+ if (TELOPT_OK(i))
+ netoprintf("%s ", TELOPT(i));
+ else if (TELCMD_OK(i))
+ netoprintf("%s ", TELCMD(i));
+ else
+ netoprintf("%d ", i);
+ if (TELOPT_OK(j))
+ netoprintf("%s", TELOPT(j));
+ else if (TELCMD_OK(j))
+ netoprintf("%s", TELCMD(j));
+ else
+ netoprintf("%d", j);
+ netoprintf(", not IAC SE!) ");
+ }
+ }
+ length -= 2;
+ }
+ if (length < 1) {
+ netoprintf("(Empty suboption ? ? ?)");
+ return;
+ }
+ switch (pointer[0]) {
+ case TELOPT_TTYPE:
+ netoprintf("TERMINAL-TYPE ");
+ switch (pointer[1]) {
+ case TELQUAL_IS:
+ netoprintf("IS \"%.*s\"", length-2, (char *)pointer+2);
+ break;
+ case TELQUAL_SEND:
+ netoprintf("SEND");
+ break;
+ default:
+ netoprintf("- unknown qualifier %d (0x%x).",
+ pointer[1], pointer[1]);
+ }
+ break;
+ case TELOPT_TSPEED:
+ netoprintf("TERMINAL-SPEED");
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ switch (pointer[1]) {
+ case TELQUAL_IS:
+ netoprintf(" IS %.*s", length-2, (char *)pointer+2);
+ break;
+ default:
+ if (pointer[1] == 1)
+ netoprintf(" SEND");
+ else
+ netoprintf(" %d (unknown)", pointer[1]);
+ for (i = 2; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+ }
+ break;
+
+ case TELOPT_LFLOW:
+ netoprintf("TOGGLE-FLOW-CONTROL");
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ switch (pointer[1]) {
+ case 0:
+ netoprintf(" OFF"); break;
+ case 1:
+ netoprintf(" ON"); break;
+ default:
+ netoprintf(" %d (unknown)", pointer[1]);
+ }
+ for (i = 2; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+
+ case TELOPT_NAWS:
+ netoprintf("NAWS");
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ if (length == 2) {
+ netoprintf(" ?%d?", pointer[1]);
+ break;
+ }
+ netoprintf(" %d %d (%d)",
+ pointer[1], pointer[2],
+ (int)((((unsigned int)pointer[1])<<8)|((unsigned int)pointer[2])));
+ if (length == 4) {
+ netoprintf(" ?%d?", pointer[3]);
+ break;
+ }
+ netoprintf(" %d %d (%d)",
+ pointer[3], pointer[4],
+ (int)((((unsigned int)pointer[3])<<8)|((unsigned int)pointer[4])));
+ for (i = 5; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+
+ case TELOPT_LINEMODE:
+ netoprintf("LINEMODE ");
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ switch (pointer[1]) {
+ case WILL:
+ netoprintf("WILL ");
+ goto common;
+ case WONT:
+ netoprintf("WONT ");
+ goto common;
+ case DO:
+ netoprintf("DO ");
+ goto common;
+ case DONT:
+ netoprintf("DONT ");
+ common:
+ if (length < 3) {
+ netoprintf("(no option ? ? ?)");
+ break;
+ }
+ switch (pointer[2]) {
+ case LM_FORWARDMASK:
+ netoprintf("Forward Mask");
+ for (i = 3; i < length; i++) {
+ netoprintf(" %x", pointer[i]);
+ }
+ break;
+ default:
+ netoprintf("%d (unknown)", pointer[2]);
+ for (i = 3; i < length; i++) {
+ netoprintf(" %d", pointer[i]);
+ }
+ break;
+ }
+ break;
+
+ case LM_SLC:
+ netoprintf("SLC");
+ for (i = 2; i < length - 2; i += 3) {
+ if (SLC_NAME_OK(pointer[i+SLC_FUNC]))
+ netoprintf(" %s", SLC_NAME(pointer[i+SLC_FUNC]));
+ else
+ netoprintf(" %d", pointer[i+SLC_FUNC]);
+ switch (pointer[i+SLC_FLAGS]&SLC_LEVELBITS) {
+ case SLC_NOSUPPORT:
+ netoprintf(" NOSUPPORT"); break;
+ case SLC_CANTCHANGE:
+ netoprintf(" CANTCHANGE"); break;
+ case SLC_VARIABLE:
+ netoprintf(" VARIABLE"); break;
+ case SLC_DEFAULT:
+ netoprintf(" DEFAULT"); break;
+ }
+ netoprintf("%s%s%s",
+ pointer[i+SLC_FLAGS]&SLC_ACK ? "|ACK" : "",
+ pointer[i+SLC_FLAGS]&SLC_FLUSHIN ? "|FLUSHIN" : "",
+ pointer[i+SLC_FLAGS]&SLC_FLUSHOUT ? "|FLUSHOUT" : "");
+ if (pointer[i+SLC_FLAGS]& ~(SLC_ACK|SLC_FLUSHIN|
+ SLC_FLUSHOUT| SLC_LEVELBITS)) {
+ netoprintf("(0x%x)", pointer[i+SLC_FLAGS]);
+ }
+ netoprintf(" %d;", pointer[i+SLC_VALUE]);
+ if ((pointer[i+SLC_VALUE] == IAC) &&
+ (pointer[i+SLC_VALUE+1] == IAC))
+ i++;
+ }
+ for (; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+
+ case LM_MODE:
+ netoprintf("MODE ");
+ if (length < 3) {
+ netoprintf("(no mode ? ? ?)");
+ break;
+ }
+ {
+ char tbuf[32];
+ snprintf(tbuf, sizeof(tbuf), "%s%s%s%s%s",
+ pointer[2]&MODE_EDIT ? "|EDIT" : "",
+ pointer[2]&MODE_TRAPSIG ? "|TRAPSIG" : "",
+ pointer[2]&MODE_SOFT_TAB ? "|SOFT_TAB" : "",
+ pointer[2]&MODE_LIT_ECHO ? "|LIT_ECHO" : "",
+ pointer[2]&MODE_ACK ? "|ACK" : "");
+ netoprintf("%s", tbuf[1] ? &tbuf[1] : "0");
+ }
+ if (pointer[2]&~(MODE_EDIT|MODE_TRAPSIG|MODE_ACK)) {
+ netoprintf(" (0x%x)", pointer[2]);
+ }
+ for (i = 3; i < length; i++) {
+ netoprintf(" ?0x%x?", pointer[i]);
+ }
+ break;
+ default:
+ netoprintf("%d (unknown)", pointer[1]);
+ for (i = 2; i < length; i++) {
+ netoprintf(" %d", pointer[i]);
+ }
+ }
+ break;
+
+ case TELOPT_STATUS: {
+ const char *cp;
+ register int j, k;
+
+ netoprintf("STATUS");
+
+ switch (pointer[1]) {
+ default:
+ if (pointer[1] == TELQUAL_SEND)
+ netoprintf(" SEND");
+ else
+ netoprintf(" %d (unknown)", pointer[1]);
+ for (i = 2; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+ case TELQUAL_IS:
+ netoprintf(" IS\r\n");
+
+ for (i = 2; i < length; i++) {
+ switch(pointer[i]) {
+ case DO: cp = "DO"; goto common2;
+ case DONT: cp = "DONT"; goto common2;
+ case WILL: cp = "WILL"; goto common2;
+ case WONT: cp = "WONT"; goto common2;
+ common2:
+ i++;
+ if (TELOPT_OK((int)pointer[i]))
+ netoprintf(" %s %s", cp, TELOPT(pointer[i]));
+ else
+ netoprintf(" %s %d", cp, pointer[i]);
+
+ netoprintf("\r\n");
+ break;
+
+ case SB:
+ netoprintf(" SB ");
+ i++;
+ j = k = i;
+ while (j < length) {
+ if (pointer[j] == SE) {
+ if (j+1 == length)
+ break;
+ if (pointer[j+1] == SE)
+ j++;
+ else
+ break;
+ }
+ pointer[k++] = pointer[j++];
+ }
+ printsub(0, &pointer[i], k - i);
+ if (i < length) {
+ netoprintf(" SE");
+ i = j;
+ } else
+ i = j - 1;
+
+ netoprintf("\r\n");
+
+ break;
+
+ default:
+ netoprintf(" %d", pointer[i]);
+ break;
+ }
+ }
+ break;
+ }
+ break;
+ }
+
+ case TELOPT_XDISPLOC:
+ netoprintf("X-DISPLAY-LOCATION ");
+ switch (pointer[1]) {
+ case TELQUAL_IS:
+ netoprintf("IS \"%.*s\"", length-2, (char *)pointer+2);
+ break;
+ case TELQUAL_SEND:
+ netoprintf("SEND");
+ break;
+ default:
+ netoprintf("- unknown qualifier %d (0x%x).",
+ pointer[1], pointer[1]);
+ }
+ break;
+
+ case TELOPT_ENVIRON:
+ netoprintf("ENVIRON ");
+ switch (pointer[1]) {
+ case TELQUAL_IS:
+ netoprintf("IS ");
+ goto env_common;
+ case TELQUAL_SEND:
+ netoprintf("SEND ");
+ goto env_common;
+ case TELQUAL_INFO:
+ netoprintf("INFO ");
+ env_common:
+ {
+ register int noquote = 2;
+ for (i = 2; i < length; i++ ) {
+ switch (pointer[i]) {
+ case ENV_VAR:
+ if (pointer[1] == TELQUAL_SEND)
+ goto def_case;
+ netoprintf("\" VAR " + noquote);
+ noquote = 2;
+ break;
+
+ case ENV_VALUE:
+ netoprintf("\" VALUE " + noquote);
+ noquote = 2;
+ break;
+
+ case ENV_ESC:
+ netoprintf("\" ESC " + noquote);
+ noquote = 2;
+ break;
+
+ default:
+ def_case:
+ if (isprint(pointer[i]) && pointer[i] != '"') {
+ if (noquote) {
+ netoprintf("\"");
+ noquote = 0;
+ }
+ netoprintf("%c", pointer[i]);
+ } else {
+ netoprintf("\" %03o " + noquote,
+ pointer[i]);
+ noquote = 2;
+ }
+ break;
+ }
+ }
+ if (!noquote)
+ netoprintf("\"");
+ break;
+ }
+ }
+ break;
+
+#if defined(AUTHENTICATE)
+ case TELOPT_AUTHENTICATION:
+ netoprintf("AUTHENTICATION");
+
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ switch (pointer[1]) {
+ case TELQUAL_REPLY:
+ case TELQUAL_IS:
+ netoprintf(" %s ", (pointer[1] == TELQUAL_IS) ?
+ "IS" : "REPLY");
+ if (AUTHTYPE_NAME_OK(pointer[2]))
+ netoprintf("%s ", AUTHTYPE_NAME(pointer[2]));
+ else
+ netoprintf("%d ", pointer[2]);
+ if (length < 3) {
+ netoprintf("(partial suboption ? ? ?)");
+ break;
+ }
+ netoprintf("%s|%s",
+ ((pointer[3] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
+ "CLIENT" : "SERVER",
+ ((pointer[3] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
+ "MUTUAL" : "ONE-WAY");
+
+ auth_printsub(&pointer[1], length - 1, buf, sizeof(buf));
+ netoprintf("%s", buf);
+ break;
+
+ case TELQUAL_SEND:
+ i = 2;
+ netoprintf(" SEND ");
+ while (i < length) {
+ if (AUTHTYPE_NAME_OK(pointer[i]))
+ netoprintf("%s ", AUTHTYPE_NAME(pointer[i]));
+ else
+ netoprintf("%d ", pointer[i]);
+ if (++i >= length) {
+ netoprintf("(partial suboption ? ? ?)");
+ break;
+ }
+ netoprintf("%s|%s ",
+ ((pointer[i] & AUTH_WHO_MASK) == AUTH_WHO_CLIENT) ?
+ "CLIENT" : "SERVER",
+ ((pointer[i] & AUTH_HOW_MASK) == AUTH_HOW_MUTUAL) ?
+ "MUTUAL" : "ONE-WAY");
+ ++i;
+ }
+ break;
+
+ case TELQUAL_NAME:
+ i = 2;
+ netoprintf(" NAME \"");
+ /*
+ * Was:
+ * while (i < length)
+ * *nfrontp += pointer[i++];
+ * *nfrontp += '"';
+ *
+ * but I'm pretty sure that's wrong...
+ */
+ while (i < length)
+ netoprintf("%c", pointer[i++]);
+ netoprintf("\"");
+ break;
+
+ default:
+ for (i = 2; i < length; i++) {
+ netoprintf(" ?%d?", pointer[i]);
+ }
+ break;
+ }
+ break;
+#endif
+
+#if defined(ENCRYPT)
+ case TELOPT_ENCRYPT:
+ netoprintf("ENCRYPT");
+ if (length < 2) {
+ netoprintf(" (empty suboption ? ? ?)");
+ break;
+ }
+ switch (pointer[1]) {
+ case ENCRYPT_START:
+ netoprintf(" START");
+ break;
+
+ case ENCRYPT_END:
+ netoprintf(" END");
+ break;
+
+ case ENCRYPT_REQSTART:
+ netoprintf(" REQUEST-START");
+ break;
+
+ case ENCRYPT_REQEND:
+ netoprintf(" REQUEST-END");
+ break;
+
+ case ENCRYPT_IS:
+ case ENCRYPT_REPLY:
+ netoprintf(" %s ", (pointer[1] == ENCRYPT_IS) ?
+ "IS" : "REPLY");
+ if (length < 3) {
+ netoprintf(" (partial suboption ? ? ?)");
+ break;
+ }
+ if (ENCTYPE_NAME_OK(pointer[2]))
+ netoprintf("%s ", ENCTYPE_NAME(pointer[2]));
+ else
+ netoprintf(" %d (unknown)", pointer[2]);
+
+ encrypt_printsub(&pointer[1], length - 1, buf, sizeof(buf));
+ netoprintf("%s", buf);
+ break;
+
+ case ENCRYPT_SUPPORT:
+ i = 2;
+ netoprintf(" SUPPORT ");
+ while (i < length) {
+ if (ENCTYPE_NAME_OK(pointer[i]))
+ netoprintf("%s ", ENCTYPE_NAME(pointer[i]));
+ else
+ netoprintf("%d ", pointer[i]);
+ i++;
+ }
+ break;
+
+ case ENCRYPT_ENC_KEYID:
+ netoprintf(" ENC_KEYID", pointer[1]);
+ goto encommon;
+
+ case ENCRYPT_DEC_KEYID:
+ netoprintf(" DEC_KEYID", pointer[1]);
+ goto encommon;
+
+ default:
+ netoprintf(" %d (unknown)", pointer[1]);
+ encommon:
+ for (i = 2; i < length; i++) {
+ netoprintf(" %d", pointer[i]);
+ }
+ break;
+ }
+ break;
+#endif
+
+ default:
+ if (TELOPT_OK(pointer[0]))
+ netoprintf("%s (unknown)", TELOPT(pointer[0]));
+ else
+ netoprintf("%d (unknown)", pointer[i]);
+ for (i = 1; i < length; i++) {
+ netoprintf(" %d", pointer[i]);
+ }
+ break;
+ }
+ netoprintf("\r\n");
+}
+
+/*
+ * Dump a data buffer in hex and ascii to the output data stream.
+ */
+void
+printdata(const char *tag, const char *ptr, int cnt)
+{
+ register int i;
+ char xbuf[30];
+
+ while (cnt) {
+ /* flush net output buffer if no room for new data) */
+ if ((&netobuf[BUFSIZ] - nfrontp) < 80) {
+ netflush();
+ }
+
+ /* add a line of output */
+ netoprintf("%s: ", tag);
+ for (i = 0; i < 20 && cnt; i++) {
+ netoprintf("%02x", *ptr);
+ if (isprint(*ptr)) {
+ xbuf[i] = *ptr;
+ } else {
+ xbuf[i] = '.';
+ }
+ if (i % 2) {
+ netoprintf(" ");
+ }
+ cnt--;
+ ptr++;
+ }
+ xbuf[i] = '\0';
+ netoprintf(" %s\r\n", xbuf );
+ }
+}
+#endif /* DIAGNOSTICS */
Index: .
===================================================================
--- . (nonexistent)
+++ . (revision 5)
Property changes on: .
___________________________________________________________________
Added: svn:ignore
## -0,0 +1,73 ##
+
+# install dir
+dist
+
+# Target build dirs
+.a1x-newlib
+.a2x-newlib
+.at91sam7s-newlib
+
+.build-machine
+
+.a1x-glibc
+.a2x-glibc
+.h3-glibc
+.h5-glibc
+.i586-glibc
+.i686-glibc
+.imx6-glibc
+.jz47xx-glibc
+.makefile
+.am335x-glibc
+.omap543x-glibc
+.p5600-glibc
+.power8-glibc
+.power8le-glibc
+.power9-glibc
+.power9le-glibc
+.m1000-glibc
+.riscv64-glibc
+.rk328x-glibc
+.rk33xx-glibc
+.rk339x-glibc
+.s8xx-glibc
+.s9xx-glibc
+.x86_64-glibc
+
+# Hidden files (each file)
+.makefile
+.dist
+.rootfs
+
+# src & hw requires
+.src_requires
+.src_requires_depend
+.requires
+.requires_depend
+
+# Tarballs
+*.gz
+*.bz2
+*.lz
+*.xz
+*.tgz
+*.txz
+
+# Signatures
+*.asc
+*.sig
+*.sign
+*.sha1sum
+
+# Patches
+*.patch
+
+# Descriptions
+*.dsc
+*.txt
+
+# Default linux config files
+*.defconfig
+
+# backup copies
+*~
Radix cross Linux
The main Radix cross Linux repository contains the build scripts of packages, which have the most complete and common functionality for desktop machines
452 Commits
2 Branches
1 Tag