File: [local] / src / usr.bin / telnet / commands.c (download)
Revision 1.88, Mon Dec 26 19:16:03 2022 UTC (16 months, 3 weeks ago) by jmc
Branch: MAIN
CVS Tags: OPENBSD_7_5_BASE, OPENBSD_7_5, OPENBSD_7_4_BASE, OPENBSD_7_4, OPENBSD_7_3_BASE, OPENBSD_7_3, HEAD
Changes since 1.87: +2 -2 lines
spelling fixes; from paul tagliamonte
amendments to his diff are noted on tech
|
/* $OpenBSD: commands.c,v 1.88 2022/12/26 19:16:03 jmc Exp $ */
/* $NetBSD: commands.c,v 1.14 1996/03/24 22:03:48 jtk Exp $ */
/*
* 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. 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.
*/
#include "telnet_locl.h"
#include <sys/socket.h>
#include <netinet/in.h>
#include <netinet/ip.h>
#include <arpa/inet.h>
#include <arpa/telnet.h>
#include <ctype.h>
#include <err.h>
#include <errno.h>
#include <netdb.h>
#include <pwd.h>
#include <stdarg.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include <limits.h>
char *hostname;
typedef struct {
char *name; /* command name */
char *help; /* help string (NULL for no help) */
int (*handler)(int, char **);/* routine which executes command */
int needconnect; /* Do we need to be connected to execute? */
} Command;
#define MAXARGV 20
static char line[256];
static int margc;
static char *margv[MAXARGV+1];
static int
makeargv(void)
{
char *cp, *cp2, c;
char **argp = margv;
int ret = 0;
margc = 0;
cp = line;
while ((c = *cp)) {
if (margc >= MAXARGV) {
printf("too many arguments\n");
ret = 1;
break;
}
int inquote = 0;
while (isspace((unsigned char)c))
c = *++cp;
if (c == '\0')
break;
*argp++ = cp;
margc += 1;
for (cp2 = cp; c != '\0'; c = *++cp) {
if (inquote) {
if (c == inquote) {
inquote = 0;
continue;
}
} else {
if (c == '\\') {
if ((c = *++cp) == '\0')
break;
} else if (c == '"') {
inquote = '"';
continue;
} else if (c == '\'') {
inquote = '\'';
continue;
} else if (isspace((unsigned char)c))
break;
}
*cp2++ = c;
}
*cp2 = '\0';
if (c == '\0')
break;
cp++;
}
*argp++ = 0;
return (ret);
}
/*
* Make a character string into a number.
*
* Todo: 1. Could take random integers (12, 0x12, 012, 0b1).
*/
static char
special(char *s)
{
char c;
char b;
switch (*s) {
case '^':
b = *++s;
if (b == '?') {
c = b | 0x40; /* DEL */
} else {
c = b & 0x1f;
}
break;
default:
c = *s;
break;
}
return c;
}
/*
* Construct a control character sequence
* for a special character.
*/
static char *
control(cc_t c)
{
static char buf[5];
/*
* The only way I could get the Sun 3.5 compiler
* to shut up about
* if ((unsigned int)c >= 0x80)
* was to assign "c" to an unsigned int variable...
* Arggg....
*/
unsigned int uic = (unsigned int)c;
if (uic == 0x7f)
return ("^?");
if (c == (cc_t)_POSIX_VDISABLE) {
return "off";
}
if (uic >= 0x80) {
buf[0] = '\\';
buf[1] = ((c>>6)&07) + '0';
buf[2] = ((c>>3)&07) + '0';
buf[3] = (c&07) + '0';
buf[4] = 0;
} else if (uic >= 0x20) {
buf[0] = c;
buf[1] = 0;
} else {
buf[0] = '^';
buf[1] = '@'+c;
buf[2] = 0;
}
return (buf);
}
/*
* The following are data structures and routines for
* the "send" command.
*
*/
struct sendlist {
char *name; /* How user refers to it (case independent) */
char *help; /* Help information (0 ==> no help) */
int needconnect; /* Need to be connected */
int narg; /* Number of arguments */
int (*handler)(); /* Routine to perform (for special ops) */
int nbyte; /* Number of bytes to send this command */
int what; /* Character to be sent (<0 ==> special) */
};
static int
send_esc(void),
send_help(void),
send_docmd(char *),
send_dontcmd(char *),
send_willcmd(char *),
send_wontcmd(char *);
static struct sendlist Sendlist[] = {
{ "ao", "Send Telnet Abort output", 1, 0, 0, 2, AO },
{ "ayt", "Send Telnet 'Are You There'", 1, 0, 0, 2, AYT },
{ "brk", "Send Telnet Break", 1, 0, 0, 2, BREAK },
{ "break", 0, 1, 0, 0, 2, BREAK },
{ "ec", "Send Telnet Erase Character", 1, 0, 0, 2, EC },
{ "el", "Send Telnet Erase Line", 1, 0, 0, 2, EL },
{ "escape", "Send current escape character", 1, 0, send_esc, 1, 0 },
{ "ga", "Send Telnet 'Go Ahead' sequence", 1, 0, 0, 2, GA },
{ "ip", "Send Telnet Interrupt Process", 1, 0, 0, 2, IP },
{ "intp", 0, 1, 0, 0, 2, IP },
{ "interrupt", 0, 1, 0, 0, 2, IP },
{ "intr", 0, 1, 0, 0, 2, IP },
{ "nop", "Send Telnet 'No operation'", 1, 0, 0, 2, NOP },
{ "eor", "Send Telnet 'End of Record'", 1, 0, 0, 2, EOR },
{ "abort", "Send Telnet 'Abort Process'", 1, 0, 0, 2, ABORT },
{ "susp", "Send Telnet 'Suspend Process'", 1, 0, 0, 2, SUSP },
{ "eof", "Send Telnet End of File Character", 1, 0, 0, 2, xEOF },
{ "synch", "Perform Telnet 'Synch operation'", 1, 0, dosynch, 2, 0 },
{ "getstatus", "Send request for STATUS", 1, 0, get_status, 6, 0 },
{ "?", "Display send options", 0, 0, send_help, 0, 0 },
{ "help", 0, 0, 0, send_help, 0, 0 },
{ "do", 0, 0, 1, send_docmd, 3, 0 },
{ "dont", 0, 0, 1, send_dontcmd, 3, 0 },
{ "will", 0, 0, 1, send_willcmd, 3, 0 },
{ "wont", 0, 0, 1, send_wontcmd, 3, 0 },
{ 0 }
};
#define GETSEND(name) ((struct sendlist *) genget(name, (char **) Sendlist, \
sizeof(struct sendlist)))
static int
sendcmd(int argc, char **argv)
{
int count; /* how many bytes we are going to need to send */
int i;
struct sendlist *s; /* pointer to current command */
int success = 0;
int needconnect = 0;
if (argc < 2) {
printf("need at least one argument for 'send' command\r\n");
printf("'send ?' for help\r\n");
return 0;
}
/*
* First, validate all the send arguments.
* In addition, we see how much space we are going to need, and
* whether or not we will be doing a "SYNCH" operation (which
* flushes the network queue).
*/
count = 0;
for (i = 1; i < argc; i++) {
s = GETSEND(argv[i]);
if (s == 0) {
printf("Unknown send argument '%s'\r\n'send ?' for help.\r\n",
argv[i]);
return 0;
} else if (Ambiguous(s)) {
printf("Ambiguous send argument '%s'\r\n'send ?' for help.\r\n",
argv[i]);
return 0;
}
if (i + s->narg >= argc) {
fprintf(stderr,
"Need %d argument%s to 'send %s' command. 'send %s ?' for help.\r\n",
s->narg, s->narg == 1 ? "" : "s", s->name, s->name);
return 0;
}
count += s->nbyte;
if (s->handler == send_help) {
send_help();
return 0;
}
i += s->narg;
needconnect += s->needconnect;
}
if (!connected && needconnect) {
printf("?Need to be connected first.\r\n");
printf("'send ?' for help\r\n");
return 0;
}
/* Now, do we have enough room? */
if (NETROOM() < count) {
printf("There is not enough room in the buffer TO the network\r\n");
printf("to process your request. Nothing will be done.\r\n");
printf("('send synch' will throw away most data in the network\r\n");
printf("buffer, if this might help.)\r\n");
return 0;
}
/* OK, they are all OK, now go through again and actually send */
count = 0;
for (i = 1; i < argc; i++) {
if ((s = GETSEND(argv[i])) == 0) {
fprintf(stderr, "Telnet 'send' error - argument disappeared!\r\n");
quit();
}
if (s->handler) {
count++;
success += (*s->handler)((s->narg > 0) ? argv[i+1] : 0,
(s->narg > 1) ? argv[i+2] : 0);
i += s->narg;
} else {
NET2ADD(IAC, s->what);
printoption("SENT", IAC, s->what);
}
}
return (count == success);
}
static int send_tncmd(void (*func)(int, int), char *cmd, char *name);
static int
send_esc(void)
{
NETADD(escape);
return 1;
}
static int
send_docmd(char *name)
{
return(send_tncmd(send_do, "do", name));
}
static int
send_dontcmd(char *name)
{
return(send_tncmd(send_dont, "dont", name));
}
static int
send_willcmd(char *name)
{
return(send_tncmd(send_will, "will", name));
}
static int
send_wontcmd(char *name)
{
return(send_tncmd(send_wont, "wont", name));
}
int
send_tncmd(void (*func)(int, int), char *cmd, char *name)
{
char **cpp;
extern char *telopts[];
int val = 0;
if (isprefix(name, "help") || isprefix(name, "?")) {
int col, len;
printf("Usage: send %s <value|option>\r\n", cmd);
printf("\"value\" must be from 0 to 255\r\n");
printf("Valid options are:\r\n\t");
col = 8;
for (cpp = telopts; *cpp; cpp++) {
len = strlen(*cpp) + 3;
if (col + len > 65) {
printf("\r\n\t");
col = 8;
}
printf(" \"%s\"", *cpp);
col += len;
}
printf("\r\n");
return 0;
}
cpp = (char **)genget(name, telopts, sizeof(char *));
if (Ambiguous(cpp)) {
fprintf(stderr,"'%s': ambiguous argument ('send %s ?' for help).\r\n",
name, cmd);
return 0;
}
if (cpp) {
val = cpp - telopts;
} else {
char *cp = name;
while (*cp >= '0' && *cp <= '9') {
val *= 10;
val += *cp - '0';
cp++;
}
if (*cp != 0) {
fprintf(stderr, "'%s': unknown argument ('send %s ?' for help).\r\n",
name, cmd);
return 0;
} else if (val < 0 || val > 255) {
fprintf(stderr, "'%s': bad value ('send %s ?' for help).\r\n",
name, cmd);
return 0;
}
}
if (!connected) {
printf("?Need to be connected first.\r\n");
return 0;
}
(*func)(val, 1);
return 1;
}
static int
send_help(void)
{
struct sendlist *s; /* pointer to current command */
for (s = Sendlist; s->name; s++) {
if (s->help)
printf("%-15s %s\r\n", s->name, s->help);
}
return(0);
}
/*
* The following are the routines and data structures referred
* to by the arguments to the "toggle" command.
*/
static int
lclchars(int unused)
{
donelclchars = 1;
return 1;
}
static int
togcrlf(int unused)
{
if (crlf) {
printf("Will send carriage returns as telnet <CR><LF>.\r\n");
} else {
printf("Will send carriage returns as telnet <CR><NUL>.\r\n");
}
return 1;
}
int binmode;
static int
togbinary(int val)
{
donebinarytoggle = 1;
if (val >= 0) {
binmode = val;
} else {
if (my_want_state_is_will(TELOPT_BINARY) &&
my_want_state_is_do(TELOPT_BINARY)) {
binmode = 1;
} else if (my_want_state_is_wont(TELOPT_BINARY) &&
my_want_state_is_dont(TELOPT_BINARY)) {
binmode = 0;
}
val = binmode ? 0 : 1;
}
if (val == 1) {
if (my_want_state_is_will(TELOPT_BINARY) &&
my_want_state_is_do(TELOPT_BINARY)) {
printf("Already operating in binary mode with remote host.\r\n");
} else {
printf("Negotiating binary mode with remote host.\r\n");
tel_enter_binary(3);
}
} else {
if (my_want_state_is_wont(TELOPT_BINARY) &&
my_want_state_is_dont(TELOPT_BINARY)) {
printf("Already in network ascii mode with remote host.\r\n");
} else {
printf("Negotiating network ascii mode with remote host.\r\n");
tel_leave_binary(3);
}
}
return 1;
}
static int
togrbinary(int val)
{
donebinarytoggle = 1;
if (val == -1)
val = my_want_state_is_do(TELOPT_BINARY) ? 0 : 1;
if (val == 1) {
if (my_want_state_is_do(TELOPT_BINARY)) {
printf("Already receiving in binary mode.\r\n");
} else {
printf("Negotiating binary mode on input.\r\n");
tel_enter_binary(1);
}
} else {
if (my_want_state_is_dont(TELOPT_BINARY)) {
printf("Already receiving in network ascii mode.\r\n");
} else {
printf("Negotiating network ascii mode on input.\r\n");
tel_leave_binary(1);
}
}
return 1;
}
static int
togxbinary(int val)
{
donebinarytoggle = 1;
if (val == -1)
val = my_want_state_is_will(TELOPT_BINARY) ? 0 : 1;
if (val == 1) {
if (my_want_state_is_will(TELOPT_BINARY)) {
printf("Already transmitting in binary mode.\r\n");
} else {
printf("Negotiating binary mode on output.\r\n");
tel_enter_binary(2);
}
} else {
if (my_want_state_is_wont(TELOPT_BINARY)) {
printf("Already transmitting in network ascii mode.\r\n");
} else {
printf("Negotiating network ascii mode on output.\r\n");
tel_leave_binary(2);
}
}
return 1;
}
static int togglehelp(int);
struct togglelist {
char *name; /* name of toggle */
char *help; /* help message */
int (*handler)(int); /* routine to do actual setting */
int *variable;
char *actionexplanation;
int needconnect; /* Need to be connected */
};
static struct togglelist Togglelist[] = {
{ "autoflush",
"flushing of output when sending interrupt characters",
0,
&autoflush,
"flush output when sending interrupt characters" },
{ "autosynch",
"automatic sending of interrupt characters in urgent mode",
0,
&autosynch,
"send interrupt characters in urgent mode" },
{ "autologin",
"automatic sending of login name",
0,
&autologin,
"send login name" },
{ "skiprc",
"don't read ~/.telnetrc file",
0,
&skiprc,
"skip reading of ~/.telnetrc file" },
{ "binary",
"sending and receiving of binary data",
togbinary,
0,
0 },
{ "inbinary",
"receiving of binary data",
togrbinary,
0,
0 },
{ "outbinary",
"sending of binary data",
togxbinary,
0,
0 },
{ "crlf",
"sending carriage returns as telnet <CR><LF>",
togcrlf,
&crlf,
0 },
{ "crmod",
"mapping of received carriage returns",
0,
&crmod,
"map carriage return on output" },
{ "localchars",
"local recognition of certain control characters",
lclchars,
&localchars,
"recognize certain control characters" },
{ " ", "", 0, 0 }, /* empty line */
{ "netdata",
"printing of hexadecimal network data (debugging)",
0,
&netdata,
"print hexadecimal representation of network traffic" },
{ "prettydump",
"output of \"netdata\" to user readable format (debugging)",
0,
&prettydump,
"print user readable output for \"netdata\"" },
{ "options",
"viewing of options processing (debugging)",
0,
&showoptions,
"show option processing" },
{ "termdata",
"(debugging) toggle printing of hexadecimal terminal data",
0,
&termdata,
"print hexadecimal representation of terminal traffic" },
{ "?",
0,
togglehelp },
{ "help",
0,
togglehelp },
{ 0 }
};
static int
togglehelp(int unused)
{
struct togglelist *c;
for (c = Togglelist; c->name; c++) {
if (c->help) {
if (*c->help)
printf("%-15s toggle %s\r\n", c->name, c->help);
else
printf("\r\n");
}
}
printf("\r\n");
printf("%-15s %s\r\n", "?", "display help information");
return 0;
}
static void
settogglehelp(int set)
{
struct togglelist *c;
for (c = Togglelist; c->name; c++) {
if (c->help) {
if (*c->help)
printf("%-15s %s %s\r\n", c->name, set ? "enable" : "disable",
c->help);
else
printf("\r\n");
}
}
}
#define GETTOGGLE(name) (struct togglelist *) \
genget(name, (char **) Togglelist, sizeof(struct togglelist))
static int
toggle(int argc, char *argv[])
{
int retval = 1;
char *name;
struct togglelist *c;
if (argc < 2) {
fprintf(stderr,
"Need an argument to 'toggle' command. 'toggle ?' for help.\r\n");
return 0;
}
argc--;
argv++;
while (argc--) {
name = *argv++;
c = GETTOGGLE(name);
if (Ambiguous(c)) {
fprintf(stderr, "'%s': ambiguous argument ('toggle ?' for help).\r\n",
name);
return 0;
} else if (c == 0) {
fprintf(stderr, "'%s': unknown argument ('toggle ?' for help).\r\n",
name);
return 0;
} else if (!connected && c->needconnect) {
printf("?Need to be connected first.\r\n");
printf("'send ?' for help\r\n");
return 0;
} else {
if (c->variable) {
*c->variable = !*c->variable; /* invert it */
if (c->actionexplanation) {
printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler) {
retval &= (*c->handler)(-1);
}
}
}
return retval;
}
/*
* The following perform the "set" command.
*/
struct termios new_tc = { 0 };
struct setlist {
char *name; /* name */
char *help; /* help information */
void (*handler)(const char *);
cc_t *charp; /* where it is located at */
};
static struct setlist Setlist[] = {
#ifdef KLUDGELINEMODE
{ "echo", "character to toggle local echoing on/off", 0, &echoc },
#endif
{ "escape", "character to escape back to telnet command mode", 0, &escape },
{ "rlogin", "rlogin escape character", 0, &rlogin },
{ " ", "" },
{ " ", "The following need 'localchars' to be toggled true", 0, 0 },
{ "flushoutput", "character to cause an Abort Output", 0, &termFlushChar },
{ "interrupt", "character to cause an Interrupt Process", 0, &termIntChar },
{ "quit", "character to cause an Abort process", 0, &termQuitChar },
{ "eof", "character to cause an EOF ", 0, &termEofChar },
{ " ", "" },
{ " ", "The following are for local editing in linemode", 0, 0 },
{ "erase", "character to use to erase a character", 0, &termEraseChar },
{ "kill", "character to use to erase a line", 0, &termKillChar },
{ "lnext", "character to use for literal next", 0, &termLiteralNextChar },
{ "susp", "character to cause a Suspend Process", 0, &termSuspChar },
{ "reprint", "character to use for line reprint", 0, &termRprntChar },
{ "worderase", "character to use to erase a word", 0, &termWerasChar },
{ "start", "character to use for XON", 0, &termStartChar },
{ "stop", "character to use for XOFF", 0, &termStopChar },
{ "forw1", "alternate end of line character", 0, &termForw1Char },
{ "forw2", "alternate end of line character", 0, &termForw2Char },
{ "ayt", "alternate AYT character", 0, &termAytChar },
{ 0 }
};
static struct setlist *
getset(char *name)
{
return (struct setlist *)
genget(name, (char **) Setlist, sizeof(struct setlist));
}
void
set_escape_char(char *s)
{
if (rlogin != _POSIX_VDISABLE) {
rlogin = (s && *s) ? special(s) : _POSIX_VDISABLE;
printf("Telnet rlogin escape character is '%s'.\r\n",
control(rlogin));
} else {
escape = (s && *s) ? special(s) : _POSIX_VDISABLE;
printf("Telnet escape character is '%s'.\r\n", control(escape));
}
}
static int
setcmd(int argc, char *argv[])
{
int value;
struct setlist *ct;
struct togglelist *c;
if (argc < 2 || argc > 3) {
printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n");
return 0;
}
if ((argc == 2) && (isprefix(argv[1], "?") || isprefix(argv[1], "help"))) {
for (ct = Setlist; ct->name; ct++)
printf("%-15s %s\r\n", ct->name, ct->help);
printf("\r\n");
settogglehelp(1);
printf("%-15s %s\r\n", "?", "display help information");
return 0;
}
ct = getset(argv[1]);
if (ct == 0) {
c = GETTOGGLE(argv[1]);
if (c == 0) {
fprintf(stderr, "'%s': unknown argument ('set ?' for help).\r\n",
argv[1]);
return 0;
} else if (Ambiguous(c)) {
fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n",
argv[1]);
return 0;
} else if (!connected && c->needconnect) {
printf("?Need to be connected first.\r\n");
printf("'send ?' for help\r\n");
return 0;
}
if (c->variable) {
if ((argc == 2) || (strcmp("on", argv[2]) == 0))
*c->variable = 1;
else if (strcmp("off", argv[2]) == 0)
*c->variable = 0;
else {
printf("Format is 'set togglename [on|off]'\r\n'set ?' for help.\r\n");
return 0;
}
if (c->actionexplanation) {
printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler)
(*c->handler)(1);
} else if (argc != 3) {
printf("Format is 'set Name Value'\r\n'set ?' for help.\r\n");
return 0;
} else if (Ambiguous(ct)) {
fprintf(stderr, "'%s': ambiguous argument ('set ?' for help).\r\n",
argv[1]);
return 0;
} else if (ct->handler) {
(*ct->handler)(argv[2]);
printf("%s set to \"%s\".\r\n", ct->name, (char *)ct->charp);
} else {
if (strcmp("off", argv[2])) {
value = special(argv[2]);
} else {
value = _POSIX_VDISABLE;
}
*(ct->charp) = (cc_t)value;
printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp)));
}
slc_check();
return 1;
}
static int
unsetcmd(int argc, char *argv[])
{
struct setlist *ct;
struct togglelist *c;
char *name;
if (argc < 2) {
fprintf(stderr,
"Need an argument to 'unset' command. 'unset ?' for help.\r\n");
return 0;
}
if (isprefix(argv[1], "?") || isprefix(argv[1], "help")) {
for (ct = Setlist; ct->name; ct++)
printf("%-15s %s\r\n", ct->name, ct->help);
printf("\r\n");
settogglehelp(0);
printf("%-15s %s\r\n", "?", "display help information");
return 0;
}
argc--;
argv++;
while (argc--) {
name = *argv++;
ct = getset(name);
if (ct == 0) {
c = GETTOGGLE(name);
if (c == 0) {
fprintf(stderr, "'%s': unknown argument ('unset ?' for help).\r\n",
name);
return 0;
} else if (Ambiguous(c)) {
fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n",
name);
return 0;
}
if (c->variable) {
*c->variable = 0;
if (c->actionexplanation) {
printf("%s %s.\r\n", *c->variable? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler)
(*c->handler)(0);
} else if (Ambiguous(ct)) {
fprintf(stderr, "'%s': ambiguous argument ('unset ?' for help).\r\n",
name);
return 0;
} else if (ct->handler) {
(*ct->handler)(NULL);
printf("%s reset to \"%s\".\r\n", ct->name, (char *)ct->charp);
} else {
*(ct->charp) = _POSIX_VDISABLE;
printf("%s character is '%s'.\r\n", ct->name, control(*(ct->charp)));
}
}
return 1;
}
/*
* The following are the data structures and routines for the
* 'mode' command.
*/
#ifdef KLUDGELINEMODE
static int
dokludgemode(int unused)
{
kludgelinemode = 1;
send_wont(TELOPT_LINEMODE, 1);
send_dont(TELOPT_SGA, 1);
send_dont(TELOPT_ECHO, 1);
return 1;
}
#endif
static int
dolinemode(int unused)
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
send_dont(TELOPT_SGA, 1);
#endif
send_will(TELOPT_LINEMODE, 1);
send_dont(TELOPT_ECHO, 1);
return 1;
}
static int
docharmode(int unused)
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
send_do(TELOPT_SGA, 1);
else
#endif
send_wont(TELOPT_LINEMODE, 1);
send_do(TELOPT_ECHO, 1);
return 1;
}
static int
dolmmode(int bit, int on)
{
unsigned char c;
if (my_want_state_is_wont(TELOPT_LINEMODE)) {
printf("?Need to have LINEMODE option enabled first.\r\n");
printf("'mode ?' for help.\r\n");
return 0;
}
if (on)
c = (linemode | bit);
else
c = (linemode & ~bit);
lm_mode(&c, 1, 1);
return 1;
}
int
tn_setmode(int bit)
{
return dolmmode(bit, 1);
}
int
tn_clearmode(int bit)
{
return dolmmode(bit, 0);
}
struct modelist {
char *name; /* command name */
char *help; /* help string */
int (*handler)(int);/* routine which executes command */
int needconnect; /* Do we need to be connected to execute? */
int arg1;
};
static int modehelp(int);
static struct modelist ModeList[] = {
{ "character", "Disable LINEMODE option", docharmode, 1 },
#ifdef KLUDGELINEMODE
{ "", "(or disable obsolete line-by-line mode)", 0 },
#endif
{ "line", "Enable LINEMODE option", dolinemode, 1 },
#ifdef KLUDGELINEMODE
{ "", "(or enable obsolete line-by-line mode)", 0 },
#endif
{ "", "", 0 },
{ "", "These require the LINEMODE option to be enabled", 0 },
{ "isig", "Enable signal trapping", tn_setmode, 1, MODE_TRAPSIG },
{ "+isig", 0, tn_setmode, 1, MODE_TRAPSIG },
{ "-isig", "Disable signal trapping", tn_clearmode, 1, MODE_TRAPSIG },
{ "edit", "Enable character editing", tn_setmode, 1, MODE_EDIT },
{ "+edit", 0, tn_setmode, 1, MODE_EDIT },
{ "-edit", "Disable character editing", tn_clearmode, 1, MODE_EDIT },
{ "softtabs", "Enable tab expansion", tn_setmode, 1, MODE_SOFT_TAB },
{ "+softtabs", 0, tn_setmode, 1, MODE_SOFT_TAB },
{ "-softtabs", "Disable character editing", tn_clearmode, 1, MODE_SOFT_TAB },
{ "litecho", "Enable literal character echo", tn_setmode, 1, MODE_LIT_ECHO },
{ "+litecho", 0, tn_setmode, 1, MODE_LIT_ECHO },
{ "-litecho", "Disable literal character echo", tn_clearmode, 1, MODE_LIT_ECHO },
{ "help", 0, modehelp, 0 },
#ifdef KLUDGELINEMODE
{ "kludgeline", 0, dokludgemode, 1 },
#endif
{ "", "", 0 },
{ "?", "Print help information", modehelp, 0 },
{ 0 },
};
static int
modehelp(int unused)
{
struct modelist *mt;
printf("format is: 'mode Mode', where 'Mode' is one of:\r\n\r\n");
for (mt = ModeList; mt->name; mt++) {
if (mt->help) {
if (*mt->help)
printf("%-15s %s\r\n", mt->name, mt->help);
else
printf("\r\n");
}
}
return 0;
}
#define GETMODECMD(name) (struct modelist *) \
genget(name, (char **) ModeList, sizeof(struct modelist))
static int
modecmd(int argc, char *argv[])
{
struct modelist *mt;
if (argc != 2) {
printf("'mode' command requires an argument\r\n");
printf("'mode ?' for help.\r\n");
} else if ((mt = GETMODECMD(argv[1])) == 0) {
fprintf(stderr, "Unknown mode '%s' ('mode ?' for help).\r\n", argv[1]);
} else if (Ambiguous(mt)) {
fprintf(stderr, "Ambiguous mode '%s' ('mode ?' for help).\r\n", argv[1]);
} else if (mt->needconnect && !connected) {
printf("?Need to be connected first.\r\n");
printf("'mode ?' for help.\r\n");
} else if (mt->handler) {
return (*mt->handler)(mt->arg1);
}
return 0;
}
/*
* The following data structures and routines implement the
* "display" command.
*/
static int
display(int argc, char *argv[])
{
struct togglelist *tl;
struct setlist *sl;
#define dotog(tl) if (tl->variable && tl->actionexplanation) { \
if (*tl->variable) { \
printf("will"); \
} else { \
printf("won't"); \
} \
printf(" %s.\r\n", tl->actionexplanation); \
}
#define doset(sl) if (sl->name && *sl->name != ' ') { \
if (sl->handler == 0) \
printf("%-15s [%s]\r\n", sl->name, control(*sl->charp)); \
else \
printf("%-15s \"%s\"\r\n", sl->name, (char *)sl->charp); \
}
if (argc == 1) {
for (tl = Togglelist; tl->name; tl++) {
dotog(tl);
}
printf("\r\n");
for (sl = Setlist; sl->name; sl++) {
doset(sl);
}
} else {
int i;
for (i = 1; i < argc; i++) {
sl = getset(argv[i]);
tl = GETTOGGLE(argv[i]);
if (Ambiguous(sl) || Ambiguous(tl)) {
printf("?Ambiguous argument '%s'.\r\n", argv[i]);
return 0;
} else if (!sl && !tl) {
printf("?Unknown argument '%s'.\r\n", argv[i]);
return 0;
} else {
if (tl) {
dotog(tl);
}
if (sl) {
doset(sl);
}
}
}
}
/*@*/optionstatus();
return 1;
#undef doset
#undef dotog
}
/*
* The following are the data structures, and many of the routines,
* relating to command processing.
*/
/*
* Set the escape character.
*/
static int
setescape(int argc, char *argv[])
{
char *arg;
char buf[50];
printf(
"Deprecated usage - please use 'set escape%s%s' in the future.\r\n",
(argc > 2)? " ":"", (argc > 2)? argv[1]: "");
if (argc > 2)
arg = argv[1];
else {
printf("new escape character: ");
(void) fgets(buf, sizeof(buf), stdin);
arg = buf;
}
if (arg[0] != '\0')
escape = arg[0];
printf("Escape character is '%s'.\r\n", control(escape));
(void) fflush(stdout);
return 1;
}
static int
togcrmod(int unused1, char *unused2[])
{
crmod = !crmod;
printf("Deprecated usage - please use 'toggle crmod' in the future.\r\n");
printf("%s map carriage return on output.\r\n", crmod ? "Will" : "Won't");
(void) fflush(stdout);
return 1;
}
int
telnetsuspend(int unused1, char *unused2[])
{
setcommandmode();
{
long oldrows, oldcols, newrows, newcols, err;
err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
(void) kill(0, SIGTSTP);
/*
* If we didn't get the window size before the SUSPEND, but we
* can get them now (?), then send the NAWS to make sure that
* we are set up for the right window size.
*/
if (TerminalWindowSize(&newrows, &newcols) && connected &&
(err || ((oldrows != newrows) || (oldcols != newcols)))) {
sendnaws();
}
}
/* reget parameters in case they were changed */
TerminalSaveState();
setconnmode(0);
return 1;
}
static void
close_connection(void)
{
if (connected) {
(void) shutdown(net, SHUT_RDWR);
printf("Connection closed.\r\n");
(void)close(net);
connected = 0;
resettermname = 1;
/* reset options */
tninit();
}
}
static int
bye(int argc, char *argv[])
{
close_connection();
longjmp(toplevel, 1);
}
void
quit(void)
{
close_connection();
Exit(0);
}
static int
quitcmd(int unused1, char *unused2[])
{
quit();
}
static int
logout(int unused1, char *unused2[])
{
send_do(TELOPT_LOGOUT, 1);
(void) netflush();
return 1;
}
/*
* The SLC command.
*/
struct slclist {
char *name;
char *help;
void (*handler)(int);
int arg;
};
static void slc_help(int);
struct slclist SlcList[] = {
{ "export", "Use local special character definitions",
slc_mode_export, 0 },
{ "import", "Use remote special character definitions",
slc_mode_import, 1 },
{ "check", "Verify remote special character definitions",
slc_mode_import, 0 },
{ "help", 0, slc_help, 0 },
{ "?", "Print help information", slc_help, 0 },
{ 0 },
};
static void
slc_help(int unused)
{
struct slclist *c;
for (c = SlcList; c->name; c++) {
if (c->help) {
if (*c->help)
printf("%-15s %s\r\n", c->name, c->help);
else
printf("\r\n");
}
}
}
static struct slclist *
getslc(char *name)
{
return (struct slclist *)
genget(name, (char **) SlcList, sizeof(struct slclist));
}
static int
slccmd(int argc, char *argv[])
{
struct slclist *c;
if (argc != 2) {
fprintf(stderr,
"Need an argument to 'slc' command. 'slc ?' for help.\r\n");
return 0;
}
c = getslc(argv[1]);
if (c == 0) {
fprintf(stderr, "'%s': unknown argument ('slc ?' for help).\r\n",
argv[1]);
return 0;
}
if (Ambiguous(c)) {
fprintf(stderr, "'%s': ambiguous argument ('slc ?' for help).\r\n",
argv[1]);
return 0;
}
(*c->handler)(c->arg);
slcstate();
return 1;
}
/*
* The ENVIRON command.
*/
struct envlist {
char *name;
char *help;
void (*handler)();
int narg;
};
static void env_help(void);
static void env_undefine(const char *);
static void env_export(const char *);
static void env_unexport(const char *);
static void env_send(const char *);
static void env_list(void);
static struct env_lst *env_find(const char *var);
struct envlist EnvList[] = {
{ "define", "Define an environment variable",
(void (*)())env_define, 2 },
{ "undefine", "Undefine an environment variable",
env_undefine, 1 },
{ "export", "Mark an environment variable for automatic export",
env_export, 1 },
{ "unexport", "Don't mark an environment variable for automatic export",
env_unexport, 1 },
{ "send", "Send an environment variable", env_send, 1 },
{ "list", "List the current environment variables",
env_list, 0 },
{ "help", 0, env_help, 0 },
{ "?", "Print help information", env_help, 0 },
{ 0 },
};
static void
env_help(void)
{
struct envlist *c;
for (c = EnvList; c->name; c++) {
if (c->help) {
if (*c->help)
printf("%-15s %s\r\n", c->name, c->help);
else
printf("\r\n");
}
}
}
static struct envlist *
getenvcmd(char *name)
{
return (struct envlist *)
genget(name, (char **) EnvList, sizeof(struct envlist));
}
static int
env_cmd(int argc, char *argv[])
{
struct envlist *c;
if (argc < 2) {
fprintf(stderr,
"Need an argument to 'environ' command. 'environ ?' for help.\r\n");
return 0;
}
c = getenvcmd(argv[1]);
if (c == 0) {
fprintf(stderr, "'%s': unknown argument ('environ ?' for help).\r\n",
argv[1]);
return 0;
}
if (Ambiguous(c)) {
fprintf(stderr, "'%s': ambiguous argument ('environ ?' for help).\r\n",
argv[1]);
return 0;
}
if (c->narg + 2 != argc) {
fprintf(stderr,
"Need %s%d argument%s to 'environ %s' command. 'environ ?' for help.\r\n",
c->narg < argc + 2 ? "only " : "",
c->narg, c->narg == 1 ? "" : "s", c->name);
return 0;
}
(*c->handler)(argv[2], argv[3]);
return 1;
}
struct env_lst {
struct env_lst *next; /* pointer to next structure */
struct env_lst *prev; /* pointer to previous structure */
char *var; /* pointer to variable name */
char *value; /* pointer to variable value */
int export; /* 1 -> export with default list of variables */
int welldefined; /* A well defined variable */
};
struct env_lst envlisthead;
static struct env_lst *
env_find(const char *var)
{
struct env_lst *ep;
for (ep = envlisthead.next; ep; ep = ep->next) {
if (strcmp(ep->var, var) == 0)
return(ep);
}
return(NULL);
}
void
env_init(void)
{
extern char **environ;
char **epp, *cp;
struct env_lst *ep;
for (epp = environ; *epp; epp++) {
if ((cp = strchr(*epp, '='))) {
*cp = '\0';
ep = env_define(*epp, cp+1);
ep->export = 0;
*cp = '=';
}
}
/*
* Special case for DISPLAY variable. If it is ":0.0" or
* "unix:0.0", we have to get rid of "unix" and insert our
* hostname.
*/
if ((ep = env_find("DISPLAY"))
&& ((*ep->value == ':')
|| (strncmp(ep->value, "unix:", 5) == 0))) {
char hbuf[HOST_NAME_MAX+1];
char *cp2 = strchr(ep->value, ':');
gethostname(hbuf, sizeof hbuf);
if (asprintf (&cp, "%s%s", hbuf, cp2) == -1)
err(1, "asprintf");
free(ep->value);
ep->value = cp;
}
/*
* If USER is not defined, but LOGNAME is, then add
* USER with the value from LOGNAME. By default, we
* don't export the USER variable.
*/
if ((env_find("USER") == NULL) && (ep = env_find("LOGNAME"))) {
env_define("USER", ep->value);
env_unexport("USER");
}
env_export("DISPLAY");
env_export("PRINTER");
env_export("XAUTHORITY");
}
struct env_lst *
env_define(const char *var, const char *value)
{
struct env_lst *ep;
if ((ep = env_find(var))) {
free(ep->var);
free(ep->value);
} else {
if ((ep = malloc(sizeof(struct env_lst))) == NULL)
err(1, "malloc");
ep->next = envlisthead.next;
envlisthead.next = ep;
ep->prev = &envlisthead;
if (ep->next)
ep->next->prev = ep;
}
ep->welldefined = opt_welldefined(var);
ep->export = 1;
if ((ep->var = strdup(var)) == NULL)
err(1, "strdup");
if ((ep->value = strdup(value)) == NULL)
err(1, "strdup");
return(ep);
}
static void
env_undefine(const char *var)
{
struct env_lst *ep;
if ((ep = env_find(var))) {
ep->prev->next = ep->next;
if (ep->next)
ep->next->prev = ep->prev;
free(ep->var);
free(ep->value);
free(ep);
}
}
static void
env_export(const char *var)
{
struct env_lst *ep;
if ((ep = env_find(var)))
ep->export = 1;
}
static void
env_unexport(const char *var)
{
struct env_lst *ep;
if ((ep = env_find(var)) != NULL)
ep->export = 0;
}
static void
env_send(const char *var)
{
struct env_lst *ep;
if (my_state_is_wont(TELOPT_NEW_ENVIRON)
) {
fprintf(stderr,
"Cannot send '%s': Telnet ENVIRON option not enabled\r\n",
var);
return;
}
ep = env_find(var);
if (ep == 0) {
fprintf(stderr, "Cannot send '%s': variable not defined\r\n",
var);
return;
}
env_opt_start_info();
env_opt_add(ep->var);
env_opt_end(0);
}
static void
env_list(void)
{
struct env_lst *ep;
for (ep = envlisthead.next; ep; ep = ep->next) {
printf("%c %-20s %s\r\n", ep->export ? '*' : ' ',
ep->var, ep->value);
}
}
char *
env_default(int init, int welldefined)
{
static struct env_lst *nep = NULL;
if (init) {
nep = &envlisthead;
return NULL;
}
if (nep) {
while ((nep = nep->next)) {
if (nep->export && (nep->welldefined == welldefined))
return(nep->var);
}
}
return(NULL);
}
char *
env_getvalue(const char *var, int exported_only)
{
struct env_lst *ep;
if ((ep = env_find(var)) && (!exported_only || ep->export))
return(ep->value);
return(NULL);
}
static void
connection_status(int local_only)
{
if (!connected)
printf("No connection.\r\n");
else {
printf("Connected to %s.\r\n", hostname);
if (!local_only) {
int mode = getconnmode();
printf("Operating ");
if (my_want_state_is_will(TELOPT_LINEMODE)) {
printf("with LINEMODE option\r\n"
"%s line editing\r\n"
"%s catching of signals\r\n",
(mode & MODE_EDIT) ? "Local" : "No",
(mode & MODE_TRAPSIG) ? "Local" : "No");
slcstate();
#ifdef KLUDGELINEMODE
} else if (kludgelinemode &&
my_want_state_is_dont(TELOPT_SGA)) {
printf("in obsolete linemode\r\n");
#endif
} else {
printf("in single character mode\r\n");
if (localchars)
printf("Catching signals locally\r\n");
}
printf("%s character echo\r\n",
(mode & MODE_ECHO) ? "Local" : "Remote");
if (my_want_state_is_will(TELOPT_LFLOW))
printf("%s flow control\r\n",
(mode & MODE_FLOW) ? "Local" : "No");
}
}
printf("Escape character is '%s'.\r\n", control(escape));
(void) fflush(stdout);
}
/*
* Print status about the connection.
*/
static int
status(int argc, char *argv[])
{
connection_status(0);
return 1;
}
/*
* Function that gets called when SIGINFO is received.
*/
void
ayt_status(int sig)
{
connection_status(1);
}
static Command *getcmd(char *name);
static void
cmdrc(char *m1, char *m2)
{
static char rcname[128];
Command *c;
FILE *rcfile;
int gotmachine = 0;
int l1 = strlen(m1);
int l2 = strlen(m2);
char m1save[HOST_NAME_MAX+1];
if (skiprc)
return;
strlcpy(m1save, m1, sizeof(m1save));
m1 = m1save;
if (rcname[0] == 0) {
char *home = getenv("HOME");
if (home == NULL || *home == '\0')
return;
snprintf (rcname, sizeof(rcname), "%s/.telnetrc",
home ? home : "");
}
if ((rcfile = fopen(rcname, "r")) == 0) {
return;
}
for (;;) {
if (fgets(line, sizeof(line), rcfile) == NULL)
break;
if (line[0] == 0)
break;
if (line[0] == '#')
continue;
if (gotmachine) {
if (!isspace((unsigned char)line[0]))
gotmachine = 0;
}
if (gotmachine == 0) {
if (isspace((unsigned char)line[0]))
continue;
if (strncasecmp(line, m1, l1) == 0)
strncpy(line, &line[l1], sizeof(line) - l1);
else if (strncasecmp(line, m2, l2) == 0)
strncpy(line, &line[l2], sizeof(line) - l2);
else if (strncasecmp(line, "DEFAULT", 7) == 0)
strncpy(line, &line[7], sizeof(line) - 7);
else
continue;
if (line[0] != ' ' && line[0] != '\t' && line[0] != '\n')
continue;
gotmachine = 1;
}
if (makeargv())
continue;
if (margv[0] == 0)
continue;
c = getcmd(margv[0]);
if (Ambiguous(c)) {
printf("?Ambiguous command: %s\r\n", margv[0]);
continue;
}
if (c == 0) {
printf("?Invalid command: %s\r\n", margv[0]);
continue;
}
/*
* This should never happen...
*/
if (c->needconnect && !connected) {
printf("?Need to be connected first for %s.\r\n", margv[0]);
continue;
}
(*c->handler)(margc, margv);
}
fclose(rcfile);
}
int
tn(int argc, char *argv[])
{
struct addrinfo hints, *res, *res0;
char *cmd, *hostp = 0, *portp = 0, *user = 0, *aliasp = 0;
int error, retry;
const int niflags = NI_NUMERICHOST, tos = IPTOS_LOWDELAY;
if (connected) {
printf("?Already connected to %s\r\n", hostname);
return 0;
}
if (connections) {
printf("Repeated connections not supported\r\n");
return 0;
}
if (argc < 2) {
strlcpy(line, "open ", sizeof(line));
printf("(to) ");
(void) fgets(&line[strlen(line)], sizeof(line) - strlen(line), stdin);
if (makeargv())
return 0;
argc = margc;
argv = margv;
}
cmd = *argv;
--argc; ++argv;
while (argc) {
if (strcmp(*argv, "help") == 0 || isprefix(*argv, "?"))
goto usage;
if (strcmp(*argv, "-l") == 0) {
--argc; ++argv;
if (argc == 0)
goto usage;
if ((user = strdup(*argv++)) == NULL)
err(1, "strdup");
--argc;
continue;
}
if (strcmp(*argv, "-b") == 0) {
--argc; ++argv;
if (argc == 0)
goto usage;
aliasp = *argv++;
--argc;
continue;
}
if (strcmp(*argv, "-a") == 0) {
--argc; ++argv;
autologin = 1;
continue;
}
if (hostp == 0) {
hostp = *argv++;
--argc;
continue;
}
if (portp == 0) {
portp = *argv++;
--argc;
continue;
}
usage:
printf("usage: %s [-a] [-b hostalias] [-l user] host-name [port]\r\n", cmd);
return 0;
}
if (hostp == 0)
goto usage;
hostname = hostp;
memset(&hints, 0, sizeof(hints));
hints.ai_family = family;
hints.ai_socktype = SOCK_STREAM;
hints.ai_flags = AI_CANONNAME;
if (portp == NULL) {
portp = "telnet";
telnetport = 1;
} else if (*portp == '-') {
portp++;
telnetport = 1;
} else
telnetport = 0;
error = getaddrinfo(hostp, portp, &hints, &res0);
if (error) {
if (error == EAI_SERVICE)
warnx("%s: bad port", portp);
else
warnx("%s: %s", hostp, gai_strerror(error));
return 0;
}
net = -1;
retry = 0;
for (res = res0; res; res = res->ai_next) {
if (1 /* retry */) {
char hbuf[NI_MAXHOST];
if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
NULL, 0, niflags) != 0) {
strlcpy(hbuf, "(invalid)", sizeof(hbuf));
}
printf("Trying %s...\r\n", hbuf);
}
net = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (net == -1)
continue;
if (aliasp) {
struct addrinfo ahints, *ares;
memset(&ahints, 0, sizeof(ahints));
ahints.ai_family = family;
ahints.ai_socktype = SOCK_STREAM;
ahints.ai_flags = AI_PASSIVE;
error = getaddrinfo(aliasp, "0", &ahints, &ares);
if (error) {
warn("%s: %s", aliasp, gai_strerror(error));
close(net);
net = -1;
continue;
}
if (bind(net, ares->ai_addr, ares->ai_addrlen) == -1) {
perror(aliasp);
(void) close(net); /* dump descriptor */
net = -1;
freeaddrinfo(ares);
continue;
}
freeaddrinfo(ares);
}
switch (res->ai_family) {
case AF_INET:
if (setsockopt(net, IPPROTO_IP, IP_TOS, &tos, sizeof(tos)) == -1
&& errno != ENOPROTOOPT)
perror("telnet: setsockopt (IP_TOS) (ignored)");
break;
case AF_INET6:
if (setsockopt(net, IPPROTO_IPV6, IPV6_TCLASS, &tos,
sizeof(tos)) == -1 && errno != ENOPROTOOPT)
perror("telnet: setsockopt (IPV6_TCLASS) (ignored)");
break;
}
if (connect(net, res->ai_addr, res->ai_addrlen) == -1) {
char hbuf[NI_MAXHOST];
if (getnameinfo(res->ai_addr, res->ai_addrlen, hbuf, sizeof(hbuf),
NULL, 0, niflags) != 0) {
strlcpy(hbuf, "(invalid)", sizeof(hbuf));
}
fprintf(stderr, "telnet: connect to address %s: %s\n", hbuf,
strerror(errno));
close(net);
net = -1;
retry++;
continue;
}
connected++;
break;
}
freeaddrinfo(res0);
if (net < 0) {
return 0;
}
cmdrc(hostp, hostname);
if (autologin && user == NULL) {
struct passwd *pw;
user = getlogin();
if (user == NULL ||
(pw = getpwnam(user)) == NULL || pw->pw_uid != getuid()) {
if ((pw = getpwuid(getuid())) != NULL)
user = pw->pw_name;
else
user = NULL;
}
}
if (user) {
env_define("USER", user);
env_export("USER");
}
connection_status(1);
if (setjmp(peerdied) == 0)
telnet(user);
(void)close(net);
ExitString("Connection closed by foreign host.\r\n",1);
}
#define HELPINDENT (sizeof ("connect"))
static char
openhelp[] = "connect to a site",
closehelp[] = "close current connection",
logouthelp[] = "forcibly logout remote user and close the connection",
quithelp[] = "exit telnet",
statushelp[] = "print status information",
helphelp[] = "print help information",
sendhelp[] = "transmit special characters ('send ?' for more)",
sethelp[] = "set operating parameters ('set ?' for more)",
unsethelp[] = "unset operating parameters ('unset ?' for more)",
togglestring[] ="toggle operating parameters ('toggle ?' for more)",
slchelp[] = "change state of special characters ('slc ?' for more)",
displayhelp[] = "display operating parameters",
zhelp[] = "suspend telnet",
envhelp[] = "change environment variables ('environ ?' for more)",
modestring[] = "try to enter line or character mode ('mode ?' for more)";
static int help(int, char**);
static Command cmdtab[] = {
{ "close", closehelp, bye, 1 },
{ "logout", logouthelp, logout, 1 },
{ "display", displayhelp, display, 0 },
{ "mode", modestring, modecmd, 0 },
{ "open", openhelp, tn, 0 },
{ "quit", quithelp, quitcmd, 0 },
{ "send", sendhelp, sendcmd, 0 },
{ "set", sethelp, setcmd, 0 },
{ "unset", unsethelp, unsetcmd, 0 },
{ "status", statushelp, status, 0 },
{ "toggle", togglestring, toggle, 0 },
{ "slc", slchelp, slccmd, 0 },
{ "z", zhelp, telnetsuspend, 0 },
{ "environ", envhelp, env_cmd, 0 },
{ "?", helphelp, help, 0 },
{ 0, 0, 0, 0 }
};
static char crmodhelp[] = "deprecated command -- use 'toggle crmod' instead";
static char escapehelp[] = "deprecated command -- use 'set escape' instead";
static Command cmdtab2[] = {
{ "help", 0, help, 0 },
{ "escape", escapehelp, setescape, 0 },
{ "crmod", crmodhelp, togcrmod, 0 },
{ 0, 0, 0, 0 }
};
static Command *
getcmd(char *name)
{
Command *cm;
if ((cm = (Command *) genget(name, (char **) cmdtab, sizeof(Command))))
return cm;
return (Command *) genget(name, (char **) cmdtab2, sizeof(Command));
}
void
command(int top, char *tbuf, int cnt)
{
Command *c;
setcommandmode();
if (!top) {
putchar('\n');
} else {
(void) signal(SIGINT, SIG_DFL);
(void) signal(SIGQUIT, SIG_DFL);
}
for (;;) {
if (rlogin == _POSIX_VDISABLE)
printf("%s> ", prompt);
if (tbuf) {
char *cp;
cp = line;
while (cnt > 0 && (*cp++ = *tbuf++) != '\n')
cnt--;
tbuf = 0;
if (cp == line || *--cp != '\n' || cp == line)
goto getline;
*cp = '\0';
if (rlogin == _POSIX_VDISABLE)
printf("%s\r\n", line);
} else {
getline:
if (rlogin != _POSIX_VDISABLE)
printf("%s> ", prompt);
if (fgets(line, sizeof(line), stdin) == NULL) {
if (feof(stdin) || ferror(stdin))
quit();
break;
}
}
if (line[0] == 0)
break;
if (makeargv())
break;
if (margv[0] == 0) {
break;
}
c = getcmd(margv[0]);
if (Ambiguous(c)) {
printf("?Ambiguous command\r\n");
continue;
}
if (c == 0) {
printf("?Invalid command\r\n");
continue;
}
if (c->needconnect && !connected) {
printf("?Need to be connected first.\r\n");
continue;
}
if ((*c->handler)(margc, margv)) {
break;
}
}
if (!top) {
if (!connected)
longjmp(toplevel, 1);
setconnmode(0);
}
}
/*
* Help command.
*/
static int
help(int argc, char *argv[])
{
Command *c;
if (argc == 1) {
printf("Commands may be abbreviated. Commands are:\r\n\r\n");
for (c = cmdtab; c->name; c++)
if (c->help) {
printf("%-*s\t%s\r\n", (int)HELPINDENT, c->name,
c->help);
}
return 0;
}
while (--argc > 0) {
char *arg;
arg = *++argv;
c = getcmd(arg);
if (Ambiguous(c))
printf("?Ambiguous help command %s\r\n", arg);
else if (c == NULL)
printf("?Invalid help command %s\r\n", arg);
else
printf("%s\r\n", c->help);
}
return 0;
}
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