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-rw-r--r--remote_cmds/telnet.tproj/telnet.c2418
1 files changed, 2418 insertions, 0 deletions
diff --git a/remote_cmds/telnet.tproj/telnet.c b/remote_cmds/telnet.tproj/telnet.c
new file mode 100644
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--- /dev/null
+++ b/remote_cmds/telnet.tproj/telnet.c
@@ -0,0 +1,2418 @@
+/*
+ * Copyright (c) 1988, 1990, 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[] = "@(#)telnet.c 8.4 (Berkeley) 5/30/95";
+#endif
+#endif
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD: src/contrib/telnet/telnet/telnet.c,v 1.16 2005/03/28 14:45:12 nectar Exp $");
+
+#include <sys/types.h>
+
+/* By the way, we need to include curses.h before telnet.h since,
+ * among other things, telnet.h #defines 'DO', which is a variable
+ * declared in curses.h.
+ */
+
+#include <ctype.h>
+#include <curses.h>
+#include <signal.h>
+#include <stdlib.h>
+#include <term.h>
+#include <unistd.h>
+#include <arpa/telnet.h>
+
+#include "ring.h"
+
+#include "defines.h"
+#include "externs.h"
+#include "types.h"
+#include "general.h"
+
+#ifdef TERMCAP
+#include <curses.h>
+#include <term.h>
+#endif /* TERMCAP */
+
+#ifdef AUTHENTICATION
+#include <libtelnet/auth.h>
+#endif
+#ifdef ENCRYPTION
+#include <libtelnet/encrypt.h>
+#endif
+#include <libtelnet/misc.h>
+
+#define strip(x) ((my_want_state_is_wont(TELOPT_BINARY)) ? ((x)&0x7f) : (x))
+
+static unsigned char subbuffer[SUBBUFSIZE],
+ *subpointer, *subend; /* buffer for sub-options */
+#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_PEEK() ((*subpointer)&0xff)
+#define SB_EOF() (subpointer >= subend)
+#define SB_LEN() (subend - subpointer)
+
+char options[256]; /* The combined options */
+char do_dont_resp[256];
+char will_wont_resp[256];
+
+int
+ eight = 0,
+ autologin = 0, /* Autologin anyone? */
+ skiprc = 0,
+ connected,
+ showoptions,
+ ISend, /* trying to send network data in */
+ telnet_debug = 0,
+ crmod,
+ netdata, /* Print out network data flow */
+ crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
+ telnetport,
+ SYNCHing, /* we are in TELNET SYNCH mode */
+ flushout, /* flush output */
+ autoflush = 0, /* flush output when interrupting? */
+ autosynch, /* send interrupt characters with SYNCH? */
+ localflow, /* we handle flow control locally */
+ restartany, /* if flow control enabled, restart on any character */
+ localchars, /* we recognize interrupt/quit */
+ donelclchars, /* the user has set "localchars" */
+ donebinarytoggle, /* the user has put us in binary */
+ dontlecho, /* do we suppress local echoing right now? */
+ globalmode,
+ doaddrlookup = 1, /* do a reverse address lookup? */
+ clienteof = 0;
+
+char *prompt = 0;
+#ifdef ENCRYPTION
+char *line; /* hack around breakage in sra.c :-( !! */
+#endif
+
+cc_t escape;
+cc_t rlogin;
+#ifdef KLUDGELINEMODE
+cc_t echoc;
+#endif
+
+/*
+ * Telnet receiver states for fsm
+ */
+#define TS_DATA 0
+#define TS_IAC 1
+#define TS_WILL 2
+#define TS_WONT 3
+#define TS_DO 4
+#define TS_DONT 5
+#define TS_CR 6
+#define TS_SB 7 /* sub-option collection */
+#define TS_SE 8 /* looking for sub-option end */
+
+static int telrcv_state;
+#ifdef OLD_ENVIRON
+unsigned char telopt_environ = TELOPT_NEW_ENVIRON;
+#else
+# define telopt_environ TELOPT_NEW_ENVIRON
+#endif
+
+jmp_buf toplevel;
+jmp_buf peerdied;
+
+int flushline;
+int linemode;
+
+#ifdef KLUDGELINEMODE
+int kludgelinemode = 1;
+#endif
+
+static int is_unique(char *, char **, char **);
+
+/*
+ * The following are some clocks used to decide how to interpret
+ * the relationship between various variables.
+ */
+
+Clocks clocks;
+
+/*
+ * Initialize telnet environment.
+ */
+
+void
+init_telnet(void)
+{
+ env_init();
+
+ SB_CLEAR();
+ ClearArray(options);
+
+ connected = ISend = localflow = donebinarytoggle = 0;
+#ifdef AUTHENTICATION
+#ifdef ENCRYPTION
+ auth_encrypt_connect(connected);
+#endif
+#endif
+ restartany = -1;
+
+ SYNCHing = 0;
+
+ /* Don't change NetTrace */
+
+ escape = CONTROL(']');
+ rlogin = _POSIX_VDISABLE;
+#ifdef KLUDGELINEMODE
+ echoc = CONTROL('E');
+#endif
+
+ flushline = 1;
+ telrcv_state = TS_DATA;
+}
+
+
+/*
+ * These routines are in charge of sending option negotiations
+ * to the other side.
+ *
+ * The basic idea is that we send the negotiation if either side
+ * is in disagreement as to what the current state should be.
+ */
+
+void
+send_do(int c, int init)
+{
+ if (init) {
+ if (((do_dont_resp[c] == 0) && my_state_is_do(c)) ||
+ my_want_state_is_do(c))
+ return;
+ set_my_want_state_do(c);
+ do_dont_resp[c]++;
+ }
+ if (telnetport < 0)
+ return;
+ NET2ADD(IAC, DO);
+ NETADD(c);
+ printoption("SENT", DO, c);
+}
+
+void
+send_dont(int c, int init)
+{
+ if (init) {
+ if (((do_dont_resp[c] == 0) && my_state_is_dont(c)) ||
+ my_want_state_is_dont(c))
+ return;
+ set_my_want_state_dont(c);
+ do_dont_resp[c]++;
+ }
+ if (telnetport < 0)
+ return;
+ NET2ADD(IAC, DONT);
+ NETADD(c);
+ printoption("SENT", DONT, c);
+}
+
+void
+send_will(int c, int init)
+{
+ if (init) {
+ if (((will_wont_resp[c] == 0) && my_state_is_will(c)) ||
+ my_want_state_is_will(c))
+ return;
+ set_my_want_state_will(c);
+ will_wont_resp[c]++;
+ }
+ if (telnetport < 0)
+ return;
+ NET2ADD(IAC, WILL);
+ NETADD(c);
+ printoption("SENT", WILL, c);
+}
+
+void
+send_wont(int c, int init)
+{
+ if (init) {
+ if (((will_wont_resp[c] == 0) && my_state_is_wont(c)) ||
+ my_want_state_is_wont(c))
+ return;
+ set_my_want_state_wont(c);
+ will_wont_resp[c]++;
+ }
+ if (telnetport < 0)
+ return;
+ NET2ADD(IAC, WONT);
+ NETADD(c);
+ printoption("SENT", WONT, c);
+}
+
+void
+willoption(int option)
+{
+ int new_state_ok = 0;
+
+ if (do_dont_resp[option]) {
+ --do_dont_resp[option];
+ if (do_dont_resp[option] && my_state_is_do(option))
+ --do_dont_resp[option];
+ }
+
+ if ((do_dont_resp[option] == 0) && my_want_state_is_dont(option)) {
+
+ switch (option) {
+
+ case TELOPT_ECHO:
+ case TELOPT_BINARY:
+ case TELOPT_SGA:
+ settimer(modenegotiated);
+ /* FALLTHROUGH */
+ case TELOPT_STATUS:
+#ifdef AUTHENTICATION
+ case TELOPT_AUTHENTICATION:
+#endif
+#ifdef ENCRYPTION
+ case TELOPT_ENCRYPT:
+#endif /* ENCRYPTION */
+ new_state_ok = 1;
+ break;
+
+ case TELOPT_TM:
+ if (flushout)
+ flushout = 0;
+ /*
+ * Special case for TM. If we get back a WILL,
+ * pretend we got back a WONT.
+ */
+ set_my_want_state_dont(option);
+ set_my_state_dont(option);
+ return; /* Never reply to TM will's/wont's */
+
+ case TELOPT_LINEMODE:
+ default:
+ break;
+ }
+
+ if (new_state_ok) {
+ set_my_want_state_do(option);
+ send_do(option, 0);
+ setconnmode(0); /* possibly set new tty mode */
+ } else {
+ do_dont_resp[option]++;
+ send_dont(option, 0);
+ }
+ }
+ set_my_state_do(option);
+#ifdef ENCRYPTION
+ if (option == TELOPT_ENCRYPT)
+ encrypt_send_support();
+#endif /* ENCRYPTION */
+}
+
+void
+wontoption(int option)
+{
+ if (do_dont_resp[option]) {
+ --do_dont_resp[option];
+ if (do_dont_resp[option] && my_state_is_dont(option))
+ --do_dont_resp[option];
+ }
+
+ if ((do_dont_resp[option] == 0) && my_want_state_is_do(option)) {
+
+ switch (option) {
+
+#ifdef KLUDGELINEMODE
+ case TELOPT_SGA:
+ if (!kludgelinemode)
+ break;
+ /* FALLTHROUGH */
+#endif
+ case TELOPT_ECHO:
+ settimer(modenegotiated);
+ break;
+
+ case TELOPT_TM:
+ if (flushout)
+ flushout = 0;
+ set_my_want_state_dont(option);
+ set_my_state_dont(option);
+ return; /* Never reply to TM will's/wont's */
+
+ default:
+ break;
+ }
+ set_my_want_state_dont(option);
+ if (my_state_is_do(option))
+ send_dont(option, 0);
+ setconnmode(0); /* Set new tty mode */
+ } else if (option == TELOPT_TM) {
+ /*
+ * Special case for TM.
+ */
+ if (flushout)
+ flushout = 0;
+ set_my_want_state_dont(option);
+ }
+ set_my_state_dont(option);
+}
+
+static void
+dooption(int option)
+{
+ int new_state_ok = 0;
+
+ if (will_wont_resp[option]) {
+ --will_wont_resp[option];
+ if (will_wont_resp[option] && my_state_is_will(option))
+ --will_wont_resp[option];
+ }
+
+ if (will_wont_resp[option] == 0) {
+ if (my_want_state_is_wont(option)) {
+
+ switch (option) {
+
+ case TELOPT_TM:
+ /*
+ * Special case for TM. We send a WILL, but pretend
+ * we sent WONT.
+ */
+ send_will(option, 0);
+ set_my_want_state_wont(TELOPT_TM);
+ set_my_state_wont(TELOPT_TM);
+ return;
+
+ case TELOPT_BINARY: /* binary mode */
+ case TELOPT_NAWS: /* window size */
+ case TELOPT_TSPEED: /* terminal speed */
+ case TELOPT_LFLOW: /* local flow control */
+ case TELOPT_TTYPE: /* terminal type option */
+ case TELOPT_SGA: /* no big deal */
+#ifdef ENCRYPTION
+ case TELOPT_ENCRYPT: /* encryption variable option */
+#endif /* ENCRYPTION */
+ new_state_ok = 1;
+ break;
+
+ case TELOPT_NEW_ENVIRON: /* New environment variable option */
+#ifdef OLD_ENVIRON
+ if (my_state_is_will(TELOPT_OLD_ENVIRON))
+ send_wont(TELOPT_OLD_ENVIRON, 1); /* turn off the old */
+ goto env_common;
+ case TELOPT_OLD_ENVIRON: /* Old environment variable option */
+ if (my_state_is_will(TELOPT_NEW_ENVIRON))
+ break; /* Don't enable if new one is in use! */
+ env_common:
+ telopt_environ = option;
+#endif
+ new_state_ok = 1;
+ break;
+
+#ifdef AUTHENTICATION
+ case TELOPT_AUTHENTICATION:
+ if (autologin)
+ new_state_ok = 1;
+ break;
+#endif
+
+ case TELOPT_XDISPLOC: /* X Display location */
+ if (env_getvalue((const unsigned char *)"DISPLAY"))
+ new_state_ok = 1;
+ break;
+
+ case TELOPT_LINEMODE:
+#ifdef KLUDGELINEMODE
+ kludgelinemode = 0;
+ send_do(TELOPT_SGA, 1);
+#endif
+ set_my_want_state_will(TELOPT_LINEMODE);
+ send_will(option, 0);
+ set_my_state_will(TELOPT_LINEMODE);
+ slc_init();
+ return;
+
+ case TELOPT_ECHO: /* We're never going to echo... */
+ default:
+ break;
+ }
+
+ if (new_state_ok) {
+ set_my_want_state_will(option);
+ send_will(option, 0);
+ setconnmode(0); /* Set new tty mode */
+ } else {
+ will_wont_resp[option]++;
+ send_wont(option, 0);
+ }
+ } else {
+ /*
+ * Handle options that need more things done after the
+ * other side has acknowledged the option.
+ */
+ switch (option) {
+ case TELOPT_LINEMODE:
+#ifdef KLUDGELINEMODE
+ kludgelinemode = 0;
+ send_do(TELOPT_SGA, 1);
+#endif
+ set_my_state_will(option);
+ slc_init();
+ send_do(TELOPT_SGA, 0);
+ return;
+ }
+ }
+ }
+ set_my_state_will(option);
+}
+
+static void
+dontoption(int option)
+{
+
+ if (will_wont_resp[option]) {
+ --will_wont_resp[option];
+ if (will_wont_resp[option] && my_state_is_wont(option))
+ --will_wont_resp[option];
+ }
+
+ if ((will_wont_resp[option] == 0) && my_want_state_is_will(option)) {
+ switch (option) {
+ case TELOPT_LINEMODE:
+ linemode = 0; /* put us back to the default state */
+ break;
+#ifdef OLD_ENVIRON
+ case TELOPT_NEW_ENVIRON:
+ /*
+ * The new environ option wasn't recognized, try
+ * the old one.
+ */
+ send_will(TELOPT_OLD_ENVIRON, 1);
+ telopt_environ = TELOPT_OLD_ENVIRON;
+ break;
+#endif
+ }
+ /* we always accept a DONT */
+ set_my_want_state_wont(option);
+ if (my_state_is_will(option))
+ send_wont(option, 0);
+ setconnmode(0); /* Set new tty mode */
+ }
+ set_my_state_wont(option);
+}
+
+/*
+ * Given a buffer returned by tgetent(), this routine will turn
+ * the pipe separated list of names in the buffer into an array
+ * of pointers to null terminated names. We toss out any bad,
+ * duplicate, or verbose names (names with spaces).
+ */
+
+static const char *name_unknown = "UNKNOWN";
+static const char *unknown[] = { NULL, NULL };
+
+static const char **
+mklist(char *buf, char *name)
+{
+ int n;
+ char c, *cp, **argvp, *cp2, **argv, **avt;
+
+ if (name) {
+ if (strlen(name) > 40) {
+ name = 0;
+ unknown[0] = name_unknown;
+ } else {
+ unknown[0] = name;
+ upcase(name);
+ }
+ } else
+ unknown[0] = name_unknown;
+ /*
+ * Count up the number of names.
+ */
+ for (n = 1, cp = buf; *cp && *cp != ':'; cp++) {
+ if (*cp == '|')
+ n++;
+ }
+ /*
+ * Allocate an array to put the name pointers into
+ */
+ argv = (char **)malloc((n+3)*sizeof(char *));
+ if (argv == 0)
+ return(unknown);
+
+ /*
+ * Fill up the array of pointers to names.
+ */
+ *argv = 0;
+ argvp = argv+1;
+ n = 0;
+ for (cp = cp2 = buf; (c = *cp); cp++) {
+ if (c == '|' || c == ':') {
+ *cp++ = '\0';
+ /*
+ * Skip entries that have spaces or are over 40
+ * characters long. If this is our environment
+ * name, then put it up front. Otherwise, as
+ * long as this is not a duplicate name (case
+ * insensitive) add it to the list.
+ */
+ if (n || (cp - cp2 > 41))
+ ;
+ else if (name && (strncasecmp(name, cp2, cp-cp2) == 0))
+ *argv = cp2;
+ else if (is_unique(cp2, argv+1, argvp))
+ *argvp++ = cp2;
+ if (c == ':')
+ break;
+ /*
+ * Skip multiple delimiters. Reset cp2 to
+ * the beginning of the next name. Reset n,
+ * the flag for names with spaces.
+ */
+ while ((c = *cp) == '|')
+ cp++;
+ cp2 = cp;
+ n = 0;
+ }
+ /*
+ * Skip entries with spaces or non-ascii values.
+ * Convert lower case letters to upper case.
+ */
+ if ((c == ' ') || !isascii(c))
+ n = 1;
+ else if (islower(c))
+ *cp = toupper(c);
+ }
+
+ /*
+ * Check for an old V6 2 character name. If the second
+ * name points to the beginning of the buffer, and is
+ * only 2 characters long, move it to the end of the array.
+ */
+ if ((argv[1] == buf) && (strlen(argv[1]) == 2)) {
+ --argvp;
+ for (avt = &argv[1]; avt < argvp; avt++)
+ *avt = *(avt+1);
+ *argvp++ = buf;
+ }
+
+ /*
+ * Duplicate last name, for TTYPE option, and null
+ * terminate the array. If we didn't find a match on
+ * our terminal name, put that name at the beginning.
+ */
+ cp = *(argvp-1);
+ *argvp++ = cp;
+ *argvp = 0;
+
+ if (*argv == 0) {
+ if (name)
+ *argv = name;
+ else {
+ --argvp;
+ for (avt = argv; avt < argvp; avt++)
+ *avt = *(avt+1);
+ }
+ }
+ if (*argv)
+ return((const char **)argv);
+ else
+ return(unknown);
+}
+
+static int
+is_unique(char *name, char **as, char **ae)
+{
+ char **ap;
+ int n;
+
+ n = strlen(name) + 1;
+ for (ap = as; ap < ae; ap++)
+ if (strncasecmp(*ap, name, n) == 0)
+ return(0);
+ return (1);
+}
+
+#ifdef TERMCAP
+char termbuf[1024];
+
+/*ARGSUSED*/
+#ifdef __APPLE__
+__private_extern__ int
+#else
+static int
+#endif
+setupterm(char *tname, int fd, int *errp)
+{
+ if (tgetent(termbuf, tname) == 1) {
+ termbuf[1023] = '\0';
+ if (errp)
+ *errp = 1;
+ return(0);
+ }
+ if (errp)
+ *errp = 0;
+ return(-1);
+}
+#else
+#define termbuf ttytype
+extern char ttytype[];
+#endif
+
+int resettermname = 1;
+
+static const char *
+gettermname(void)
+{
+ char *tname;
+ static const char **tnamep = 0;
+ static const char **next;
+ int err;
+
+ if (resettermname) {
+ resettermname = 0;
+ if (tnamep && tnamep != unknown)
+ free(tnamep);
+ if ((tname = (char *)env_getvalue((const unsigned char *)"TERM")) &&
+ (setupterm(tname, 1, &err) == 0)) {
+ tnamep = mklist(termbuf, tname);
+ } else {
+ if (tname && (strlen(tname) <= 40)) {
+ unknown[0] = tname;
+ upcase(tname);
+ } else
+ unknown[0] = name_unknown;
+ tnamep = unknown;
+ }
+ next = tnamep;
+ }
+ if (*next == 0)
+ next = tnamep;
+ return(*next++);
+}
+/*
+ * suboption()
+ *
+ * Look at the sub-option buffer, and try to be helpful to the other
+ * side.
+ *
+ * Currently we recognize:
+ *
+ * Terminal type, send request.
+ * Terminal speed (send request).
+ * Local flow control (is request).
+ * Linemode
+ */
+
+static void
+suboption(void)
+{
+ unsigned char subchar;
+
+ printsub('<', subbuffer, SB_LEN()+2);
+ switch (subchar = SB_GET()) {
+ case TELOPT_TTYPE:
+ if (my_want_state_is_wont(TELOPT_TTYPE))
+ return;
+ if (SB_EOF() || SB_GET() != TELQUAL_SEND) {
+ return;
+ } else {
+ const char *name;
+ unsigned char temp[50];
+ int len;
+
+ name = gettermname();
+ len = strlen(name) + 4 + 2;
+ if (len < NETROOM()) {
+ sprintf((char *)temp, "%c%c%c%c%s%c%c", IAC, SB, TELOPT_TTYPE,
+ TELQUAL_IS, name, IAC, SE);
+ ring_supply_data(&netoring, temp, len);
+ printsub('>', &temp[2], len-2);
+ } else {
+ ExitString("No room in buffer for terminal type.\n", 1);
+ /*NOTREACHED*/
+ }
+ }
+ break;
+ case TELOPT_TSPEED:
+ if (my_want_state_is_wont(TELOPT_TSPEED))
+ return;
+ if (SB_EOF())
+ return;
+ if (SB_GET() == TELQUAL_SEND) {
+ long ospeed, ispeed;
+ unsigned char temp[50];
+ int len;
+
+ TerminalSpeeds(&ispeed, &ospeed);
+
+ sprintf((char *)temp, "%c%c%c%c%ld,%ld%c%c", IAC, SB, TELOPT_TSPEED,
+ TELQUAL_IS, ospeed, ispeed, IAC, SE);
+ len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
+
+ if (len < NETROOM()) {
+ ring_supply_data(&netoring, temp, len);
+ printsub('>', temp+2, len - 2);
+ }
+/*@*/ else printf("lm_will: not enough room in buffer\n");
+ }
+ break;
+ case TELOPT_LFLOW:
+ if (my_want_state_is_wont(TELOPT_LFLOW))
+ return;
+ if (SB_EOF())
+ return;
+ switch(SB_GET()) {
+ case LFLOW_RESTART_ANY:
+ restartany = 1;
+ break;
+ case LFLOW_RESTART_XON:
+ restartany = 0;
+ break;
+ case LFLOW_ON:
+ localflow = 1;
+ break;
+ case LFLOW_OFF:
+ localflow = 0;
+ break;
+ default:
+ return;
+ }
+ setcommandmode();
+ setconnmode(0);
+ break;
+
+ case TELOPT_LINEMODE:
+ if (my_want_state_is_wont(TELOPT_LINEMODE))
+ return;
+ if (SB_EOF())
+ return;
+ switch (SB_GET()) {
+ case WILL:
+ lm_will(subpointer, SB_LEN());
+ break;
+ case WONT:
+ lm_wont(subpointer, SB_LEN());
+ break;
+ case DO:
+ lm_do(subpointer, SB_LEN());
+ break;
+ case DONT:
+ lm_dont(subpointer, SB_LEN());
+ break;
+ case LM_SLC:
+ slc(subpointer, SB_LEN());
+ break;
+ case LM_MODE:
+ lm_mode(subpointer, SB_LEN(), 0);
+ break;
+ default:
+ break;
+ }
+ break;
+
+#ifdef OLD_ENVIRON
+ case TELOPT_OLD_ENVIRON:
+#endif
+ case TELOPT_NEW_ENVIRON:
+ if (SB_EOF())
+ return;
+ switch(SB_PEEK()) {
+ case TELQUAL_IS:
+ case TELQUAL_INFO:
+ if (my_want_state_is_dont(subchar))
+ return;
+ break;
+ case TELQUAL_SEND:
+ if (my_want_state_is_wont(subchar)) {
+ return;
+ }
+ break;
+ default:
+ return;
+ }
+ env_opt(subpointer, SB_LEN());
+ break;
+
+ case TELOPT_XDISPLOC:
+ if (my_want_state_is_wont(TELOPT_XDISPLOC))
+ return;
+ if (SB_EOF())
+ return;
+ if (SB_GET() == TELQUAL_SEND) {
+ unsigned char temp[50], *dp;
+ int len;
+
+ if ((dp = env_getvalue((const unsigned char *)"DISPLAY")) == NULL ||
+ strlen((const char *)dp) > sizeof(temp) - 7) {
+ /*
+ * Something happened, we no longer have a DISPLAY
+ * variable. Or it is too long. So, turn off the option.
+ */
+ send_wont(TELOPT_XDISPLOC, 1);
+ break;
+ }
+ snprintf((char *)temp, sizeof(temp), "%c%c%c%c%s%c%c", IAC, SB,
+ TELOPT_XDISPLOC, TELQUAL_IS, dp, IAC, SE);
+ len = strlen((char *)temp+4) + 4; /* temp[3] is 0 ... */
+
+ if (len < NETROOM()) {
+ ring_supply_data(&netoring, temp, len);
+ printsub('>', temp+2, len - 2);
+ }
+/*@*/ else printf("lm_will: not enough room in buffer\n");
+ }
+ break;
+
+#ifdef AUTHENTICATION
+ case TELOPT_AUTHENTICATION: {
+ if (!autologin)
+ break;
+ if (SB_EOF())
+ return;
+ switch(SB_GET()) {
+ case TELQUAL_IS:
+ if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
+ return;
+ auth_is(subpointer, SB_LEN());
+ break;
+ case TELQUAL_SEND:
+ if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
+ return;
+ auth_send(subpointer, SB_LEN());
+ break;
+ case TELQUAL_REPLY:
+ if (my_want_state_is_wont(TELOPT_AUTHENTICATION))
+ return;
+ auth_reply(subpointer, SB_LEN());
+ break;
+ case TELQUAL_NAME:
+ if (my_want_state_is_dont(TELOPT_AUTHENTICATION))
+ return;
+ auth_name(subpointer, SB_LEN());
+ break;
+ }
+ }
+ break;
+#endif
+#ifdef ENCRYPTION
+ case TELOPT_ENCRYPT:
+ if (SB_EOF())
+ return;
+ switch(SB_GET()) {
+ case ENCRYPT_START:
+ if (my_want_state_is_dont(TELOPT_ENCRYPT))
+ return;
+ encrypt_start(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_END:
+ if (my_want_state_is_dont(TELOPT_ENCRYPT))
+ return;
+ encrypt_end();
+ break;
+ case ENCRYPT_SUPPORT:
+ if (my_want_state_is_wont(TELOPT_ENCRYPT))
+ return;
+ encrypt_support(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_REQSTART:
+ if (my_want_state_is_wont(TELOPT_ENCRYPT))
+ return;
+ encrypt_request_start(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_REQEND:
+ if (my_want_state_is_wont(TELOPT_ENCRYPT))
+ return;
+ /*
+ * We can always send an REQEND so that we cannot
+ * get stuck encrypting. We should only get this
+ * if we have been able to get in the correct mode
+ * anyhow.
+ */
+ encrypt_request_end();
+ break;
+ case ENCRYPT_IS:
+ if (my_want_state_is_dont(TELOPT_ENCRYPT))
+ return;
+ encrypt_is(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_REPLY:
+ if (my_want_state_is_wont(TELOPT_ENCRYPT))
+ return;
+ encrypt_reply(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_ENC_KEYID:
+ if (my_want_state_is_dont(TELOPT_ENCRYPT))
+ return;
+ encrypt_enc_keyid(subpointer, SB_LEN());
+ break;
+ case ENCRYPT_DEC_KEYID:
+ if (my_want_state_is_wont(TELOPT_ENCRYPT))
+ return;
+ encrypt_dec_keyid(subpointer, SB_LEN());
+ break;
+ default:
+ break;
+ }
+ break;
+#endif /* ENCRYPTION */
+ default:
+ break;
+ }
+}
+
+static unsigned char str_lm[] = { IAC, SB, TELOPT_LINEMODE, 0, 0, IAC, SE };
+
+void
+lm_will(unsigned char *cmd, int len)
+{
+ if (len < 1) {
+/*@*/ printf("lm_will: no command!!!\n"); /* Should not happen... */
+ return;
+ }
+ switch(cmd[0]) {
+ case LM_FORWARDMASK: /* We shouldn't ever get this... */
+ default:
+ str_lm[3] = DONT;
+ str_lm[4] = cmd[0];
+ if (NETROOM() > (int)sizeof(str_lm)) {
+ ring_supply_data(&netoring, str_lm, sizeof(str_lm));
+ printsub('>', &str_lm[2], sizeof(str_lm)-2);
+ }
+/*@*/ else printf("lm_will: not enough room in buffer\n");
+ break;
+ }
+}
+
+void
+lm_wont(unsigned char *cmd, int len)
+{
+ if (len < 1) {
+/*@*/ printf("lm_wont: no command!!!\n"); /* Should not happen... */
+ return;
+ }
+ switch(cmd[0]) {
+ case LM_FORWARDMASK: /* We shouldn't ever get this... */
+ default:
+ /* We are always DONT, so don't respond */
+ return;
+ }
+}
+
+void
+lm_do(unsigned char *cmd, int len)
+{
+ if (len < 1) {
+/*@*/ printf("lm_do: no command!!!\n"); /* Should not happen... */
+ return;
+ }
+ switch(cmd[0]) {
+ case LM_FORWARDMASK:
+ default:
+ str_lm[3] = WONT;
+ str_lm[4] = cmd[0];
+ if (NETROOM() > (int)sizeof(str_lm)) {
+ ring_supply_data(&netoring, str_lm, sizeof(str_lm));
+ printsub('>', &str_lm[2], sizeof(str_lm)-2);
+ }
+/*@*/ else printf("lm_do: not enough room in buffer\n");
+ break;
+ }
+}
+
+void
+lm_dont(unsigned char *cmd, int len)
+{
+ if (len < 1) {
+/*@*/ printf("lm_dont: no command!!!\n"); /* Should not happen... */
+ return;
+ }
+ switch(cmd[0]) {
+ case LM_FORWARDMASK:
+ default:
+ /* we are always WONT, so don't respond */
+ break;
+ }
+}
+
+static unsigned char str_lm_mode[] = {
+ IAC, SB, TELOPT_LINEMODE, LM_MODE, 0, IAC, SE
+};
+
+void
+lm_mode(unsigned char *cmd, int len, int init)
+{
+ if (len != 1)
+ return;
+ if ((linemode&MODE_MASK&~MODE_ACK) == *cmd)
+ return;
+ if (*cmd&MODE_ACK)
+ return;
+ linemode = *cmd&(MODE_MASK&~MODE_ACK);
+ str_lm_mode[4] = linemode;
+ if (!init)
+ str_lm_mode[4] |= MODE_ACK;
+ if (NETROOM() > (int)sizeof(str_lm_mode)) {
+ ring_supply_data(&netoring, str_lm_mode, sizeof(str_lm_mode));
+ printsub('>', &str_lm_mode[2], sizeof(str_lm_mode)-2);
+ }
+/*@*/ else printf("lm_mode: not enough room in buffer\n");
+ setconnmode(0); /* set changed mode */
+}
+
+
+
+/*
+ * slc()
+ * Handle special character suboption of LINEMODE.
+ */
+
+struct spc {
+ cc_t val;
+ cc_t *valp;
+ char flags; /* Current flags & level */
+ char mylevel; /* Maximum level & flags */
+} spc_data[NSLC+1];
+
+#define SLC_IMPORT 0
+#define SLC_EXPORT 1
+#define SLC_RVALUE 2
+static int slc_mode = SLC_EXPORT;
+
+void
+slc_init(void)
+{
+ struct spc *spcp;
+
+ localchars = 1;
+ for (spcp = spc_data; spcp < &spc_data[NSLC+1]; spcp++) {
+ spcp->val = 0;
+ spcp->valp = 0;
+ spcp->flags = spcp->mylevel = SLC_NOSUPPORT;
+ }
+
+#define initfunc(func, flags) { \
+ spcp = &spc_data[func]; \
+ if ((spcp->valp = tcval(func))) { \
+ spcp->val = *spcp->valp; \
+ spcp->mylevel = SLC_VARIABLE|flags; \
+ } else { \
+ spcp->val = 0; \
+ spcp->mylevel = SLC_DEFAULT; \
+ } \
+ }
+
+ initfunc(SLC_SYNCH, 0);
+ /* No BRK */
+ initfunc(SLC_AO, 0);
+ initfunc(SLC_AYT, 0);
+ /* No EOR */
+ initfunc(SLC_ABORT, SLC_FLUSHIN|SLC_FLUSHOUT);
+ initfunc(SLC_EOF, 0);
+#ifndef SYSV_TERMIO
+ initfunc(SLC_SUSP, SLC_FLUSHIN);
+#endif
+ initfunc(SLC_EC, 0);
+ initfunc(SLC_EL, 0);
+#ifndef SYSV_TERMIO
+ initfunc(SLC_EW, 0);
+ initfunc(SLC_RP, 0);
+ initfunc(SLC_LNEXT, 0);
+#endif
+ initfunc(SLC_XON, 0);
+ initfunc(SLC_XOFF, 0);
+#ifdef SYSV_TERMIO
+ spc_data[SLC_XON].mylevel = SLC_CANTCHANGE;
+ spc_data[SLC_XOFF].mylevel = SLC_CANTCHANGE;
+#endif
+ initfunc(SLC_FORW1, 0);
+#ifdef USE_TERMIO
+ initfunc(SLC_FORW2, 0);
+ /* No FORW2 */
+#endif
+
+ initfunc(SLC_IP, SLC_FLUSHIN|SLC_FLUSHOUT);
+#undef initfunc
+
+ if (slc_mode == SLC_EXPORT)
+ slc_export();
+ else
+ slc_import(1);
+
+}
+
+void
+slcstate(void)
+{
+ printf("Special characters are %s values\n",
+ slc_mode == SLC_IMPORT ? "remote default" :
+ slc_mode == SLC_EXPORT ? "local" :
+ "remote");
+}
+
+void
+slc_mode_export(void)
+{
+ slc_mode = SLC_EXPORT;
+ if (my_state_is_will(TELOPT_LINEMODE))
+ slc_export();
+}
+
+void
+slc_mode_import(int def)
+{
+ slc_mode = def ? SLC_IMPORT : SLC_RVALUE;
+ if (my_state_is_will(TELOPT_LINEMODE))
+ slc_import(def);
+}
+
+unsigned char slc_import_val[] = {
+ IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_VARIABLE, 0, IAC, SE
+};
+unsigned char slc_import_def[] = {
+ IAC, SB, TELOPT_LINEMODE, LM_SLC, 0, SLC_DEFAULT, 0, IAC, SE
+};
+
+void
+slc_import(int def)
+{
+ if (NETROOM() > (int)sizeof(slc_import_val)) {
+ if (def) {
+ ring_supply_data(&netoring, slc_import_def, sizeof(slc_import_def));
+ printsub('>', &slc_import_def[2], sizeof(slc_import_def)-2);
+ } else {
+ ring_supply_data(&netoring, slc_import_val, sizeof(slc_import_val));
+ printsub('>', &slc_import_val[2], sizeof(slc_import_val)-2);
+ }
+ }
+/*@*/ else printf("slc_import: not enough room\n");
+}
+
+void
+slc_export(void)
+{
+ struct spc *spcp;
+
+ TerminalDefaultChars();
+
+ slc_start_reply();
+ for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
+ if (spcp->mylevel != SLC_NOSUPPORT) {
+ if (spcp->val == (cc_t)(_POSIX_VDISABLE))
+ spcp->flags = SLC_NOSUPPORT;
+ else
+ spcp->flags = spcp->mylevel;
+ if (spcp->valp)
+ spcp->val = *spcp->valp;
+ slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
+ }
+ }
+ slc_end_reply();
+ (void)slc_update();
+ setconnmode(1); /* Make sure the character values are set */
+}
+
+void
+slc(unsigned char *cp, int len)
+{
+ struct spc *spcp;
+ int func,level;
+
+ slc_start_reply();
+
+ for (; len >= 3; len -=3, cp +=3) {
+
+ func = cp[SLC_FUNC];
+
+ if (func == 0) {
+ /*
+ * Client side: always ignore 0 function.
+ */
+ continue;
+ }
+ if (func > NSLC) {
+ if ((cp[SLC_FLAGS] & SLC_LEVELBITS) != SLC_NOSUPPORT)
+ slc_add_reply(func, SLC_NOSUPPORT, 0);
+ continue;
+ }
+
+ spcp = &spc_data[func];
+
+ level = cp[SLC_FLAGS]&(SLC_LEVELBITS|SLC_ACK);
+
+ if ((cp[SLC_VALUE] == (unsigned char)spcp->val) &&
+ ((level&SLC_LEVELBITS) == (spcp->flags&SLC_LEVELBITS))) {
+ continue;
+ }
+
+ if (level == (SLC_DEFAULT|SLC_ACK)) {
+ /*
+ * This is an error condition, the SLC_ACK
+ * bit should never be set for the SLC_DEFAULT
+ * level. Our best guess to recover is to
+ * ignore the SLC_ACK bit.
+ */
+ cp[SLC_FLAGS] &= ~SLC_ACK;
+ }
+
+ if (level == ((spcp->flags&SLC_LEVELBITS)|SLC_ACK)) {
+ spcp->val = (cc_t)cp[SLC_VALUE];
+ spcp->flags = cp[SLC_FLAGS]; /* include SLC_ACK */
+ continue;
+ }
+
+ level &= ~SLC_ACK;
+
+ if (level <= (spcp->mylevel&SLC_LEVELBITS)) {
+ spcp->flags = cp[SLC_FLAGS]|SLC_ACK;
+ spcp->val = (cc_t)cp[SLC_VALUE];
+ }
+ if (level == SLC_DEFAULT) {
+ if ((spcp->mylevel&SLC_LEVELBITS) != SLC_DEFAULT)
+ spcp->flags = spcp->mylevel;
+ else
+ spcp->flags = SLC_NOSUPPORT;
+ }
+ slc_add_reply(func, spcp->flags, spcp->val);
+ }
+ slc_end_reply();
+ if (slc_update())
+ setconnmode(1); /* set the new character values */
+}
+
+void
+slc_check(void)
+{
+ struct spc *spcp;
+
+ slc_start_reply();
+ for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
+ if (spcp->valp && spcp->val != *spcp->valp) {
+ spcp->val = *spcp->valp;
+ if (spcp->val == (cc_t)(_POSIX_VDISABLE))
+ spcp->flags = SLC_NOSUPPORT;
+ else
+ spcp->flags = spcp->mylevel;
+ slc_add_reply(spcp - spc_data, spcp->flags, spcp->val);
+ }
+ }
+ slc_end_reply();
+ setconnmode(1);
+}
+
+unsigned char slc_reply[128];
+unsigned char const * const slc_reply_eom = &slc_reply[sizeof(slc_reply)];
+unsigned char *slc_replyp;
+
+void
+slc_start_reply(void)
+{
+ slc_replyp = slc_reply;
+ *slc_replyp++ = IAC;
+ *slc_replyp++ = SB;
+ *slc_replyp++ = TELOPT_LINEMODE;
+ *slc_replyp++ = LM_SLC;
+}
+
+void
+slc_add_reply(unsigned char func, unsigned char flags, cc_t value)
+{
+ /* A sequence of up to 6 bytes my be written for this member of the SLC
+ * suboption list by this function. The end of negotiation command,
+ * which is written by slc_end_reply(), will require 2 additional
+ * bytes. Do not proceed unless there is sufficient space for these
+ * items.
+ */
+ if (&slc_replyp[6+2] > slc_reply_eom)
+ return;
+ if ((*slc_replyp++ = func) == IAC)
+ *slc_replyp++ = IAC;
+ if ((*slc_replyp++ = flags) == IAC)
+ *slc_replyp++ = IAC;
+ if ((*slc_replyp++ = (unsigned char)value) == IAC)
+ *slc_replyp++ = IAC;
+}
+
+void
+slc_end_reply(void)
+{
+ int len;
+
+ /* The end of negotiation command requires 2 bytes. */
+ if (&slc_replyp[2] > slc_reply_eom)
+ return;
+ *slc_replyp++ = IAC;
+ *slc_replyp++ = SE;
+ len = slc_replyp - slc_reply;
+ if (len <= 6)
+ return;
+ if (NETROOM() > len) {
+ ring_supply_data(&netoring, slc_reply, slc_replyp - slc_reply);
+ printsub('>', &slc_reply[2], slc_replyp - slc_reply - 2);
+ }
+/*@*/else printf("slc_end_reply: not enough room\n");
+}
+
+int
+slc_update(void)
+{
+ struct spc *spcp;
+ int need_update = 0;
+
+ for (spcp = &spc_data[1]; spcp < &spc_data[NSLC+1]; spcp++) {
+ if (!(spcp->flags&SLC_ACK))
+ continue;
+ spcp->flags &= ~SLC_ACK;
+ if (spcp->valp && (*spcp->valp != spcp->val)) {
+ *spcp->valp = spcp->val;
+ need_update = 1;
+ }
+ }
+ return(need_update);
+}
+
+#ifdef OLD_ENVIRON
+# ifdef ENV_HACK
+/*
+ * Earlier version of telnet/telnetd from the BSD code had
+ * the definitions of VALUE and VAR reversed. To ensure
+ * maximum interoperability, we assume that the server is
+ * an older BSD server, until proven otherwise. The newer
+ * BSD servers should be able to handle either definition,
+ * so it is better to use the wrong values if we don't
+ * know what type of server it is.
+ */
+int env_auto = 1;
+int old_env_var = OLD_ENV_VAR;
+int old_env_value = OLD_ENV_VALUE;
+# else
+# define old_env_var OLD_ENV_VAR
+# define old_env_value OLD_ENV_VALUE
+# endif
+#endif
+
+void
+env_opt(unsigned char *buf, int len)
+{
+ unsigned char *ep = 0, *epc = 0;
+ int i;
+
+ switch(buf[0]&0xff) {
+ case TELQUAL_SEND:
+ env_opt_start();
+ if (len == 1) {
+ env_opt_add(NULL);
+ } else for (i = 1; i < len; i++) {
+ switch (buf[i]&0xff) {
+#ifdef OLD_ENVIRON
+ case OLD_ENV_VAR:
+# ifdef ENV_HACK
+ if (telopt_environ == TELOPT_OLD_ENVIRON
+ && env_auto) {
+ /* Server has the same definitions */
+ old_env_var = OLD_ENV_VAR;
+ old_env_value = OLD_ENV_VALUE;
+ }
+ /* FALLTHROUGH */
+# endif
+ case OLD_ENV_VALUE:
+ /*
+ * Although OLD_ENV_VALUE is not legal, we will
+ * still recognize it, just in case it is an
+ * old server that has VAR & VALUE mixed up...
+ */
+ /* FALLTHROUGH */
+#else
+ case NEW_ENV_VAR:
+#endif
+ case ENV_USERVAR:
+ if (ep) {
+ *epc = 0;
+ env_opt_add(ep);
+ }
+ ep = epc = &buf[i+1];
+ break;
+ case ENV_ESC:
+ i++;
+ /*FALLTHROUGH*/
+ default:
+ if (epc)
+ *epc++ = buf[i];
+ break;
+ }
+ }
+ if (ep) {
+ *epc = 0;
+ env_opt_add(ep);
+ }
+ env_opt_end(1);
+ break;
+
+ case TELQUAL_IS:
+ case TELQUAL_INFO:
+ /* Ignore for now. We shouldn't get it anyway. */
+ break;
+
+ default:
+ break;
+ }
+}
+
+#define OPT_REPLY_SIZE (2 * SUBBUFSIZE)
+unsigned char *opt_reply = NULL;
+unsigned char *opt_replyp;
+unsigned char *opt_replyend;
+
+void
+env_opt_start(void)
+{
+ if (opt_reply)
+ opt_reply = (unsigned char *)realloc(opt_reply, OPT_REPLY_SIZE);
+ else
+ opt_reply = (unsigned char *)malloc(OPT_REPLY_SIZE);
+ if (opt_reply == NULL) {
+/*@*/ printf("env_opt_start: malloc()/realloc() failed!!!\n");
+ opt_reply = opt_replyp = opt_replyend = NULL;
+ return;
+ }
+ opt_replyp = opt_reply;
+ opt_replyend = opt_reply + OPT_REPLY_SIZE;
+ *opt_replyp++ = IAC;
+ *opt_replyp++ = SB;
+ *opt_replyp++ = telopt_environ;
+ *opt_replyp++ = TELQUAL_IS;
+}
+
+void
+env_opt_start_info(void)
+{
+ env_opt_start();
+ if (opt_replyp)
+ opt_replyp[-1] = TELQUAL_INFO;
+}
+
+void
+env_opt_add(unsigned char *ep)
+{
+ unsigned char *vp, c;
+
+ if (opt_reply == NULL) /*XXX*/
+ return; /*XXX*/
+
+ if (ep == NULL || *ep == '\0') {
+ /* Send user defined variables first. */
+ env_default(1, 0);
+ while ((ep = env_default(0, 0)))
+ env_opt_add(ep);
+
+ /* Now add the list of well know variables. */
+ env_default(1, 1);
+ while ((ep = env_default(0, 1)))
+ env_opt_add(ep);
+ return;
+ }
+ vp = env_getvalue(ep);
+ if (opt_replyp + (vp ? 2 * strlen((char *)vp) : 0) +
+ 2 * strlen((char *)ep) + 6 > opt_replyend)
+ {
+ int len;
+#ifdef __APPLE__
+ // rdar://problem/4022837
+ opt_replyend += OPT_REPLY_SIZE + 2*strlen((char *)ep) + 2*(vp ? strlen((char *)vp) : 0);
+#else
+ opt_replyend += OPT_REPLY_SIZE;
+#endif
+ len = opt_replyend - opt_reply;
+ opt_reply = (unsigned char *)realloc(opt_reply, len);
+ if (opt_reply == NULL) {
+/*@*/ printf("env_opt_add: realloc() failed!!!\n");
+ opt_reply = opt_replyp = opt_replyend = NULL;
+ return;
+ }
+ opt_replyp = opt_reply + len - (opt_replyend - opt_replyp);
+ opt_replyend = opt_reply + len;
+ }
+ if (opt_welldefined((const char *)ep))
+#ifdef OLD_ENVIRON
+ if (telopt_environ == TELOPT_OLD_ENVIRON)
+ *opt_replyp++ = old_env_var;
+ else
+#endif
+ *opt_replyp++ = NEW_ENV_VAR;
+ else
+ *opt_replyp++ = ENV_USERVAR;
+ for (;;) {
+ while ((c = *ep++)) {
+ if (opt_replyp + (2 + 2) > opt_replyend)
+ return;
+ switch(c&0xff) {
+ case IAC:
+ *opt_replyp++ = IAC;
+ break;
+ case NEW_ENV_VAR:
+ case NEW_ENV_VALUE:
+ case ENV_ESC:
+ case ENV_USERVAR:
+ *opt_replyp++ = ENV_ESC;
+ break;
+ }
+ *opt_replyp++ = c;
+ }
+ if ((ep = vp)) {
+ if (opt_replyp + (1 + 2 + 2) > opt_replyend)
+ return;
+#ifdef OLD_ENVIRON
+ if (telopt_environ == TELOPT_OLD_ENVIRON)
+ *opt_replyp++ = old_env_value;
+ else
+#endif
+ *opt_replyp++ = NEW_ENV_VALUE;
+ vp = NULL;
+ } else
+ break;
+ }
+}
+
+int
+opt_welldefined(const char *ep)
+{
+ if ((strcmp(ep, "USER") == 0) ||
+ (strcmp(ep, "DISPLAY") == 0) ||
+ (strcmp(ep, "PRINTER") == 0) ||
+ (strcmp(ep, "SYSTEMTYPE") == 0) ||
+ (strcmp(ep, "JOB") == 0) ||
+ (strcmp(ep, "ACCT") == 0))
+ return(1);
+ return(0);
+}
+
+void
+env_opt_end(int emptyok)
+{
+ int len;
+
+ if (opt_replyp + 2 > opt_replyend)
+ return;
+ len = opt_replyp + 2 - opt_reply;
+ if (emptyok || len > 6) {
+ *opt_replyp++ = IAC;
+ *opt_replyp++ = SE;
+ if (NETROOM() > len) {
+ ring_supply_data(&netoring, opt_reply, len);
+ printsub('>', &opt_reply[2], len - 2);
+ }
+/*@*/ else printf("slc_end_reply: not enough room\n");
+ }
+ if (opt_reply) {
+ free(opt_reply);
+ opt_reply = opt_replyp = opt_replyend = NULL;
+ }
+}
+
+
+
+int
+telrcv(void)
+{
+ int c;
+ int scc;
+ unsigned char *sbp = NULL;
+ int count;
+ int returnValue = 0;
+
+ scc = 0;
+ count = 0;
+ while (TTYROOM() > 2) {
+ if (scc == 0) {
+ if (count) {
+ ring_consumed(&netiring, count);
+ returnValue = 1;
+ count = 0;
+ }
+ sbp = netiring.consume;
+ scc = ring_full_consecutive(&netiring);
+ if (scc == 0) {
+ /* No more data coming in */
+ break;
+ }
+ }
+
+ c = *sbp++ & 0xff, scc--; count++;
+#ifdef ENCRYPTION
+ if (decrypt_input)
+ c = (*decrypt_input)(c);
+#endif /* ENCRYPTION */
+
+ switch (telrcv_state) {
+
+ case TS_CR:
+ telrcv_state = TS_DATA;
+ if (c == '\0') {
+ break; /* Ignore \0 after CR */
+ }
+ else if ((c == '\n') && my_want_state_is_dont(TELOPT_ECHO) && !crmod) {
+ TTYADD(c);
+ break;
+ }
+ /* FALLTHROUGH */
+
+ case TS_DATA:
+ if (c == IAC && telnetport >= 0) {
+ telrcv_state = TS_IAC;
+ break;
+ }
+ /*
+ * The 'crmod' hack (see following) is needed
+ * since we can't * set CRMOD on output only.
+ * Machines like MULTICS like to send \r without
+ * \n; since we must turn off CRMOD to get proper
+ * input, the mapping is done here (sigh).
+ */
+ if ((c == '\r') && my_want_state_is_dont(TELOPT_BINARY)) {
+ if (scc > 0) {
+ c = *sbp&0xff;
+#ifdef ENCRYPTION
+ if (decrypt_input)
+ c = (*decrypt_input)(c);
+#endif /* ENCRYPTION */
+ if (c == 0) {
+ sbp++, scc--; count++;
+ /* a "true" CR */
+ TTYADD('\r');
+ } else if (my_want_state_is_dont(TELOPT_ECHO) &&
+ (c == '\n')) {
+ sbp++, scc--; count++;
+ TTYADD('\n');
+ } else {
+#ifdef ENCRYPTION
+ if (decrypt_input)
+ (*decrypt_input)(-1);
+#endif /* ENCRYPTION */
+
+ TTYADD('\r');
+ if (crmod) {
+ TTYADD('\n');
+ }
+ }
+ } else {
+ telrcv_state = TS_CR;
+ TTYADD('\r');
+ if (crmod) {
+ TTYADD('\n');
+ }
+ }
+ } else {
+ TTYADD(c);
+ }
+ continue;
+
+ case TS_IAC:
+process_iac:
+ switch (c) {
+
+ case WILL:
+ telrcv_state = TS_WILL;
+ continue;
+
+ case WONT:
+ telrcv_state = TS_WONT;
+ continue;
+
+ case DO:
+ telrcv_state = TS_DO;
+ continue;
+
+ case DONT:
+ telrcv_state = TS_DONT;
+ continue;
+
+ case DM:
+ /*
+ * We may have missed an urgent notification,
+ * so make sure we flush whatever is in the
+ * buffer currently.
+ */
+ printoption("RCVD", IAC, DM);
+ SYNCHing = 1;
+ (void) ttyflush(1);
+ SYNCHing = stilloob();
+ settimer(gotDM);
+ break;
+
+ case SB:
+ SB_CLEAR();
+ telrcv_state = TS_SB;
+ continue;
+
+ case IAC:
+ TTYADD(IAC);
+ break;
+
+ case NOP:
+ case GA:
+ default:
+ printoption("RCVD", IAC, c);
+ break;
+ }
+ telrcv_state = TS_DATA;
+ continue;
+
+ case TS_WILL:
+ printoption("RCVD", WILL, c);
+ willoption(c);
+ telrcv_state = TS_DATA;
+ continue;
+
+ case TS_WONT:
+ printoption("RCVD", WONT, c);
+ wontoption(c);
+ telrcv_state = TS_DATA;
+ continue;
+
+ case TS_DO:
+ printoption("RCVD", DO, c);
+ dooption(c);
+ if (c == TELOPT_NAWS) {
+ sendnaws();
+ } else if (c == TELOPT_LFLOW) {
+ localflow = 1;
+ setcommandmode();
+ setconnmode(0);
+ }
+ telrcv_state = TS_DATA;
+ continue;
+
+ case TS_DONT:
+ printoption("RCVD", DONT, c);
+ dontoption(c);
+ flushline = 1;
+ setconnmode(0); /* set new tty mode (maybe) */
+ telrcv_state = TS_DATA;
+ continue;
+
+ case TS_SB:
+ if (c == IAC) {
+ telrcv_state = TS_SE;
+ } else {
+ SB_ACCUM(c);
+ }
+ continue;
+
+ case TS_SE:
+ if (c != SE) {
+ if (c != IAC) {
+ /*
+ * This is an error. We only expect to get
+ * "IAC IAC" or "IAC SE". Several things may
+ * have happend. An IAC was not doubled, the
+ * IAC SE was left off, or another option got
+ * inserted into the suboption are all possibilities.
+ * If we assume that the IAC was not doubled,
+ * and really the IAC SE was left off, we could
+ * get into an infinate loop here. So, instead,
+ * we terminate the suboption, and process the
+ * partial suboption if we can.
+ */
+ SB_ACCUM(IAC);
+ SB_ACCUM(c);
+ subpointer -= 2;
+ SB_TERM();
+
+ printoption("In SUBOPTION processing, RCVD", IAC, c);
+ suboption(); /* handle sub-option */
+ telrcv_state = TS_IAC;
+ goto process_iac;
+ }
+ SB_ACCUM(c);
+ telrcv_state = TS_SB;
+ } else {
+ SB_ACCUM(IAC);
+ SB_ACCUM(SE);
+ subpointer -= 2;
+ SB_TERM();
+ suboption(); /* handle sub-option */
+ telrcv_state = TS_DATA;
+ }
+ }
+ }
+ if (count)
+ ring_consumed(&netiring, count);
+ return returnValue||count;
+}
+
+static int bol = 1, local = 0;
+
+int
+rlogin_susp(void)
+{
+ if (local) {
+ local = 0;
+ bol = 1;
+ command(0, "z\n", 2);
+ return(1);
+ }
+ return(0);
+}
+
+static int
+telsnd(void)
+{
+ int tcc;
+ int count;
+ int returnValue = 0;
+ unsigned char *tbp = NULL;
+
+ tcc = 0;
+ count = 0;
+ while (NETROOM() > 2) {
+ int sc;
+ int c;
+
+ if (tcc == 0) {
+ if (count) {
+ ring_consumed(&ttyiring, count);
+ returnValue = 1;
+ count = 0;
+ }
+ tbp = ttyiring.consume;
+ tcc = ring_full_consecutive(&ttyiring);
+ if (tcc == 0) {
+ break;
+ }
+ }
+ c = *tbp++ & 0xff, sc = strip(c), tcc--; count++;
+ if (rlogin != _POSIX_VDISABLE) {
+ if (bol) {
+ bol = 0;
+ if (sc == rlogin) {
+ local = 1;
+ continue;
+ }
+ } else if (local) {
+ local = 0;
+ if (sc == '.' || c == termEofChar) {
+ bol = 1;
+ command(0, "close\n", 6);
+ continue;
+ }
+ if (sc == termSuspChar) {
+ bol = 1;
+ command(0, "z\n", 2);
+ continue;
+ }
+ if (sc == escape) {
+ command(0, (const char *)tbp, tcc);
+ bol = 1;
+ count += tcc;
+ tcc = 0;
+ flushline = 1;
+ break;
+ }
+ if (sc != rlogin) {
+ ++tcc;
+ --tbp;
+ --count;
+ c = sc = rlogin;
+ }
+ }
+ if ((sc == '\n') || (sc == '\r'))
+ bol = 1;
+ } else if (escape != _POSIX_VDISABLE && sc == escape) {
+ /*
+ * Double escape is a pass through of a single escape character.
+ */
+ if (tcc && strip(*tbp) == escape) {
+ tbp++;
+ tcc--;
+ count++;
+ bol = 0;
+ } else {
+ command(0, (char *)tbp, tcc);
+ bol = 1;
+ count += tcc;
+ tcc = 0;
+ flushline = 1;
+ break;
+ }
+ } else
+ bol = 0;
+#ifdef KLUDGELINEMODE
+ if (kludgelinemode && (globalmode&MODE_EDIT) && (sc == echoc)) {
+ if (tcc > 0 && strip(*tbp) == echoc) {
+ tcc--; tbp++; count++;
+ } else {
+ dontlecho = !dontlecho;
+ settimer(echotoggle);
+ setconnmode(0);
+ flushline = 1;
+ break;
+ }
+ }
+#endif
+ if (MODE_LOCAL_CHARS(globalmode)) {
+ if (TerminalSpecialChars(sc) == 0) {
+ bol = 1;
+ break;
+ }
+ }
+ if (my_want_state_is_wont(TELOPT_BINARY)) {
+ switch (c) {
+ case '\n':
+ /*
+ * If we are in CRMOD mode (\r ==> \n)
+ * on our local machine, then probably
+ * a newline (unix) is CRLF (TELNET).
+ */
+ if (MODE_LOCAL_CHARS(globalmode)) {
+ NETADD('\r');
+ }
+ NETADD('\n');
+ bol = flushline = 1;
+ break;
+ case '\r':
+ if (!crlf) {
+ NET2ADD('\r', '\0');
+ } else {
+ NET2ADD('\r', '\n');
+ }
+ bol = flushline = 1;
+ break;
+ case IAC:
+ NET2ADD(IAC, IAC);
+ break;
+ default:
+ NETADD(c);
+ break;
+ }
+ } else if (c == IAC) {
+ NET2ADD(IAC, IAC);
+ } else {
+ NETADD(c);
+ }
+ }
+ if (count)
+ ring_consumed(&ttyiring, count);
+ return returnValue||count; /* Non-zero if we did anything */
+}
+
+/*
+ * Scheduler()
+ *
+ * Try to do something.
+ *
+ * If we do something useful, return 1; else return 0.
+ *
+ */
+
+static int
+Scheduler(int block)
+{
+ /* One wants to be a bit careful about setting returnValue
+ * to one, since a one implies we did some useful work,
+ * and therefore probably won't be called to block next
+ */
+ int returnValue;
+ int netin, netout, netex, ttyin, ttyout;
+
+ /* Decide which rings should be processed */
+
+ netout = ring_full_count(&netoring) &&
+ (flushline ||
+ (my_want_state_is_wont(TELOPT_LINEMODE)
+#ifdef KLUDGELINEMODE
+ && (!kludgelinemode || my_want_state_is_do(TELOPT_SGA))
+#endif
+ ) ||
+ my_want_state_is_will(TELOPT_BINARY));
+ ttyout = ring_full_count(&ttyoring);
+
+ ttyin = ring_empty_count(&ttyiring) && (clienteof == 0);
+
+ netin = !ISend && ring_empty_count(&netiring);
+
+ netex = !SYNCHing;
+
+ /* Call to system code to process rings */
+
+ returnValue = process_rings(netin, netout, netex, ttyin, ttyout, !block);
+
+ /* Now, look at the input rings, looking for work to do. */
+
+ if (ring_full_count(&ttyiring)) {
+ returnValue |= telsnd();
+ }
+
+ if (ring_full_count(&netiring)) {
+ returnValue |= telrcv();
+ }
+ return returnValue;
+}
+
+#ifdef AUTHENTICATION
+#define __unusedhere
+#else
+#define __unusedhere __unused
+#endif
+/*
+ * Select from tty and network...
+ */
+void
+telnet(char *user __unusedhere)
+{
+ sys_telnet_init();
+
+#ifdef AUTHENTICATION
+#ifdef ENCRYPTION
+ {
+ static char local_host[256] = { 0 };
+
+ if (!local_host[0]) {
+ gethostname(local_host, sizeof(local_host));
+ local_host[sizeof(local_host)-1] = 0;
+ }
+ auth_encrypt_init(local_host, hostname, "TELNET", 0);
+ auth_encrypt_user(user);
+ }
+#endif
+#endif
+ if (telnetport > 0) {
+#ifdef AUTHENTICATION
+ if (autologin)
+ send_will(TELOPT_AUTHENTICATION, 1);
+#endif
+#ifdef ENCRYPTION
+ send_do(TELOPT_ENCRYPT, 1);
+ send_will(TELOPT_ENCRYPT, 1);
+#endif /* ENCRYPTION */
+ send_do(TELOPT_SGA, 1);
+ send_will(TELOPT_TTYPE, 1);
+ send_will(TELOPT_NAWS, 1);
+ send_will(TELOPT_TSPEED, 1);
+ send_will(TELOPT_LFLOW, 1);
+ send_will(TELOPT_LINEMODE, 1);
+ send_will(TELOPT_NEW_ENVIRON, 1);
+ send_do(TELOPT_STATUS, 1);
+ if (env_getvalue((const unsigned char *)"DISPLAY"))
+ send_will(TELOPT_XDISPLOC, 1);
+ if (eight)
+ tel_enter_binary(eight);
+ }
+
+ for (;;) {
+ int schedValue;
+
+ while ((schedValue = Scheduler(0)) != 0) {
+ if (schedValue == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+
+ if (Scheduler(1) == -1) {
+ setcommandmode();
+ return;
+ }
+ }
+}
+
+#if 0 /* XXX - this not being in is a bug */
+/*
+ * 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 */
+ {
+ char *look = current+2;
+
+ for (;;) {
+ if ((*look++&0xff) == IAC) {
+ if ((*look++&0xff) == SE) {
+ return look;
+ }
+ }
+ }
+ }
+ default:
+ return current+2;
+ }
+}
+#endif /* 0 */
+
+/*
+ * 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.
+ */
+
+static void
+netclear(void)
+{
+ /* Deleted */
+}
+
+/*
+ * These routines add various telnet commands to the data stream.
+ */
+
+static void
+doflush(void)
+{
+ NET2ADD(IAC, DO);
+ NETADD(TELOPT_TM);
+ flushline = 1;
+ flushout = 1;
+ (void) ttyflush(1); /* Flush/drop output */
+ /* do printoption AFTER flush, otherwise the output gets tossed... */
+ printoption("SENT", DO, TELOPT_TM);
+}
+
+void
+xmitAO(void)
+{
+ NET2ADD(IAC, AO);
+ printoption("SENT", IAC, AO);
+ if (autoflush) {
+ doflush();
+ }
+}
+
+void
+xmitEL(void)
+{
+ NET2ADD(IAC, EL);
+ printoption("SENT", IAC, EL);
+}
+
+void
+xmitEC(void)
+{
+ NET2ADD(IAC, EC);
+ printoption("SENT", IAC, EC);
+}
+
+int
+dosynch(char *ch __unused)
+{
+ netclear(); /* clear the path to the network */
+ NETADD(IAC);
+ setneturg();
+ NETADD(DM);
+ printoption("SENT", IAC, DM);
+ return 1;
+}
+
+int want_status_response = 0;
+
+int
+get_status(char *ch __unused)
+{
+ unsigned char tmp[16];
+ unsigned char *cp;
+
+ if (my_want_state_is_dont(TELOPT_STATUS)) {
+ printf("Remote side does not support STATUS option\n");
+ return 0;
+ }
+ cp = tmp;
+
+ *cp++ = IAC;
+ *cp++ = SB;
+ *cp++ = TELOPT_STATUS;
+ *cp++ = TELQUAL_SEND;
+ *cp++ = IAC;
+ *cp++ = SE;
+ if (NETROOM() >= cp - tmp) {
+ ring_supply_data(&netoring, tmp, cp-tmp);
+ printsub('>', tmp+2, cp - tmp - 2);
+ }
+ ++want_status_response;
+ return 1;
+}
+
+void
+intp(void)
+{
+ NET2ADD(IAC, IP);
+ printoption("SENT", IAC, IP);
+ flushline = 1;
+ if (autoflush) {
+ doflush();
+ }
+ if (autosynch) {
+ dosynch(NULL);
+ }
+}
+
+void
+sendbrk(void)
+{
+ NET2ADD(IAC, BREAK);
+ printoption("SENT", IAC, BREAK);
+ flushline = 1;
+ if (autoflush) {
+ doflush();
+ }
+ if (autosynch) {
+ dosynch(NULL);
+ }
+}
+
+void
+sendabort(void)
+{
+ NET2ADD(IAC, ABORT);
+ printoption("SENT", IAC, ABORT);
+ flushline = 1;
+ if (autoflush) {
+ doflush();
+ }
+ if (autosynch) {
+ dosynch(NULL);
+ }
+}
+
+void
+sendsusp(void)
+{
+ NET2ADD(IAC, SUSP);
+ printoption("SENT", IAC, SUSP);
+ flushline = 1;
+ if (autoflush) {
+ doflush();
+ }
+ if (autosynch) {
+ dosynch(NULL);
+ }
+}
+
+void
+sendeof(void)
+{
+ NET2ADD(IAC, xEOF);
+ printoption("SENT", IAC, xEOF);
+}
+
+void
+sendayt(void)
+{
+ NET2ADD(IAC, AYT);
+ printoption("SENT", IAC, AYT);
+}
+
+/*
+ * Send a window size update to the remote system.
+ */
+
+void
+sendnaws(void)
+{
+ long rows, cols;
+ unsigned char tmp[16];
+ unsigned char *cp;
+
+ if (my_state_is_wont(TELOPT_NAWS))
+ return;
+
+#define PUTSHORT(cp, x) { if ((*cp++ = ((x)>>8)&0xff) == IAC) *cp++ = IAC; \
+ if ((*cp++ = ((x))&0xff) == IAC) *cp++ = IAC; }
+
+ if (TerminalWindowSize(&rows, &cols) == 0) { /* Failed */
+ return;
+ }
+
+ cp = tmp;
+
+ *cp++ = IAC;
+ *cp++ = SB;
+ *cp++ = TELOPT_NAWS;
+ PUTSHORT(cp, cols);
+ PUTSHORT(cp, rows);
+ *cp++ = IAC;
+ *cp++ = SE;
+ if (NETROOM() >= cp - tmp) {
+ ring_supply_data(&netoring, tmp, cp-tmp);
+ printsub('>', tmp+2, cp - tmp - 2);
+ }
+}
+
+void
+tel_enter_binary(int rw)
+{
+ if (rw&1)
+ send_do(TELOPT_BINARY, 1);
+ if (rw&2)
+ send_will(TELOPT_BINARY, 1);
+}
+
+void
+tel_leave_binary(int rw)
+{
+ if (rw&1)
+ send_dont(TELOPT_BINARY, 1);
+ if (rw&2)
+ send_wont(TELOPT_BINARY, 1);
+}
generated by cgit v1.2.3-56-ge451 (git 2.39.0) at 2024-05-21 12:24:12 +0000