#pragma ident "%Z%%M% %I% %E% SMI"
/*
* 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.
*
* Copyright 2005 Sun Microsystems, Inc. All rights reserved.
* Use is subject to license terms.
*/
#ifndef lint
static char sccsid[] = "@(#)commands.c 8.1 (Berkeley) 6/6/93";
#endif /* not lint */
#include <sys/param.h>
#include <sys/file.h>
#include <sys/socket.h>
#include <sys/sysmacros.h>
#include <netinet/in.h>
#include <signal.h>
#include <netdb.h>
#include <ctype.h>
#include <pwd.h>
#include <errno.h>
#include <strings.h>
#include <arpa/telnet.h>
#include <arpa/inet.h>
#include "general.h"
#include "ring.h"
#include "externs.h"
#include "defines.h"
#include "types.h"
extern char *telnet_krb5_realm;
extern void krb5_profile_get_options(char *, char *,
profile_options_boolean*);
#include <k5-int.h>
#include <profile/prof_int.h>
profile_options_boolean config_file_options[] = {
{ "forwardable", &forwardable_flag, 0},
{ "forward", &forward_flag, 0},
{ "encrypt", &encrypt_flag, 0 },
{ "autologin", &autologin, 0 },
{ NULL, NULL, 0}
};
#include <netinet/ip.h>
/*
* Number of maximum IPv4 gateways user can specify. This number is limited by
* the maximum size of the IPv4 options in the IPv4 header.
*/
#define MAX_GATEWAY 8
/*
* Number of maximum IPv6 gateways user can specify. This number is limited by
* the maximum header extension length of the IPv6 routing header.
*/
#define MAX_GATEWAY6 127
#define MAXMAX_GATEWAY MAX(MAX_GATEWAY, MAX_GATEWAY6)
/*
* Depending on the address resolutions of the target and gateways,
* we determine which addresses of the target we'll try connecting to.
*/
#define ALL_ADDRS 0 /* try all addrs of target */
#define ONLY_V4 1 /* try only IPv4 addrs of target */
#define ONLY_V6 2 /* try only IPv6 addrs of target */
#if defined(USE_TOS)
int tos = -1;
#endif
char *hostname;
static char _hostname[MAXHOSTNAMELEN];
static int send_tncmd(void (*func)(), char *, char *);
static void call(int n_ptrs, ...);
static int cmdrc(char *, char *);
typedef struct {
char *name; /* command name */
char *help; /* help string (NULL for no help) */
int (*handler)(); /* routine which executes command */
int needconnect; /* Do we need to be connected to execute? */
} Command;
/*
* storage for IPv6 and/or IPv4 addresses of gateways
*/
struct gateway {
struct in6_addr gw_addr6;
struct in_addr gw_addr;
};
/*
* IPv4 source routing option.
* In order to avoid padding for the alignment of IPv4 addresses, ipsr_addrs
* is defined as a 2-D array of uint8_t, instead of 1-D array of struct in_addr.
* If it were defined as "struct in_addr ipsr_addrs[1]", "ipsr_ptr" would be
* followed by one byte of padding to avoid misaligned struct in_addr.
*/
struct ip_sourceroute {
uint8_t ipsr_code;
uint8_t ipsr_len;
uint8_t ipsr_ptr;
/* up to 9 IPv4 addresses */
uint8_t ipsr_addrs[1][sizeof (struct in_addr)];
};
static char *line = NULL;
static unsigned linesize = 0;
static int margc;
static char **margv = NULL;
static unsigned margvlen = 0;
static int doing_rc = 0; /* .telnetrc file is being read and processed */
static void
Close(int *fd)
{
if (*fd != -1) {
(void) close(*fd);
*fd = -1;
}
}
static void
Free(char **p)
{
if (*p != NULL) {
free(*p);
*p = NULL;
}
}
static void
FreeHostnameList(char *list[])
{
unsigned i;
for (i = 0; i <= MAXMAX_GATEWAY && list[i] != NULL; i++)
Free(&list[i]);
}
#define MARGV_CHUNK_SIZE 8
static void
set_argv(str)
char *str;
{
if (margc == margvlen) {
char **newmargv;
margvlen += MARGV_CHUNK_SIZE;
if ((newmargv = realloc(margv, margvlen * sizeof (char *)))
== NULL)
ExitString("telnet: no space for arguments",
EXIT_FAILURE);
margv = newmargv;
}
margv[margc] = str;
if (str != NULL)
margc++;
}
static void
makeargv()
{
char *cp, *cp2, c;
boolean_t shellcmd = B_FALSE;
margc = 0;
cp = line;
if (*cp == '!') { /* Special case shell escape */
set_argv("!"); /* No room in string to get this */
cp++;
shellcmd = B_TRUE;
}
while ((c = *cp) != '\0') {
register int inquote = 0;
while (isspace(c))
c = *++cp;
if (c == '\0')
break;
set_argv(cp);
/*
* For the shell escape, put the rest of the line, less
* leading space, into a single argument, breaking out from
* the loop to prevent the rest of the line being split up
* into smaller arguments.
*/
if (shellcmd)
break;
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(c))
break;
}
*cp2++ = c;
}
*cp2 = '\0';
if (c == '\0')
break;
cp++;
}
set_argv((char *)NULL);
}
/*
* Make a character string into a number.
*
* Todo: 1. Could take random integers (12, 0x12, 012, 0b1).
*/
static int
special(s)
register char *s;
{
register 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(c)
register 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....
*/
register 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);
}
/*
* Same as control() except that its only used for escape handling, which uses
* _POSIX_VDISABLE differently and is aided by the use of the state variable
* escape_valid.
*/
static char *
esc_control(c)
register 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....
*/
register unsigned int uic = (unsigned int)c;
if (escape_valid == B_FALSE)
return ("off");
if (uic == 0x7f)
return ("^?");
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);
static int send_help(void);
static int send_docmd(char *);
static int send_dontcmd(char *);
static int send_willcmd(char *);
static int 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 },
{ "b", 0, 1, 0, 0, 2, BREAK },
{ "br", 0, 1, 0, 0, 2, BREAK },
{ "break", 0, 1, 0, 0, 2, BREAK },
{ "brk", "Send Telnet Break", 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(argc, argv)
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) {
(void) printf(
"need at least one argument for 'send' command\n");
(void) printf("'send ?' for help\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) {
(void) printf("Unknown send argument '%s'\n'send ?' "
"for help.\n", argv[i]);
return (0);
} else if (Ambiguous(s)) {
(void) printf("Ambiguous send argument '%s'\n'send ?' "
"for help.\n", argv[i]);
return (0);
}
if (i + s->narg >= argc) {
(void) fprintf(stderr,
"Need %d argument%s to 'send %s' "
"command. 'send %s ?' for help.\n",
s->narg, s->narg == 1 ? "" : "s", s->name, s->name);
return (0);
}
count += s->nbyte;
if (s->handler == send_help) {
(void) send_help();
return (0);
}
i += s->narg;
needconnect += s->needconnect;
}
if (!connected && needconnect) {
(void) printf("?Need to be connected first.\n");
(void) printf("'send ?' for help\n");
return (0);
}
/* Now, do we have enough room? */
if (NETROOM() < count) {
(void) printf("There is not enough room in the buffer "
"TO the network\n");
(void) printf(
"to process your request. Nothing will be done.\n");
(void) printf("('send synch' will throw away most "
"data in the network\n");
(void) printf("buffer, if this might help.)\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) {
(void) fprintf(stderr,
"Telnet 'send' error - argument disappeared!\n");
(void) quit();
/*NOTREACHED*/
}
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_esc()
{
NETADD(escape);
return (1);
}
static int
send_docmd(name)
char *name;
{
return (send_tncmd(send_do, "do", name));
}
static int
send_dontcmd(name)
char *name;
{
return (send_tncmd(send_dont, "dont", name));
}
static int
send_willcmd(name)
char *name;
{
return (send_tncmd(send_will, "will", name));
}
static int
send_wontcmd(name)
char *name;
{
return (send_tncmd(send_wont, "wont", name));
}
int
send_tncmd(func, cmd, name)
void (*func)();
char *cmd, *name;
{
char **cpp;
extern char *telopts[];
register int val = 0;
if (isprefix(name, "help") || isprefix(name, "?")) {
register int col, len;
(void) printf("Usage: send %s <value|option>\n", cmd);
(void) printf("\"value\" must be from 0 to 255\n");
(void) printf("Valid options are:\n\t");
col = 8;
for (cpp = telopts; *cpp; cpp++) {
len = strlen(*cpp) + 3;
if (col + len > 65) {
(void) printf("\n\t");
col = 8;
}
(void) printf(" \"%s\"", *cpp);
col += len;
}
(void) printf("\n");
return (0);
}
cpp = (char **)genget(name, telopts, sizeof (char *));
if (Ambiguous(cpp)) {
(void) fprintf(stderr,
"'%s': ambiguous argument ('send %s ?' for help).\n",
name, cmd);
return (0);
}
if (cpp) {
val = cpp - telopts;
} else {
register char *cp = name;
while (*cp >= '0' && *cp <= '9') {
val *= 10;
val += *cp - '0';
cp++;
}
if (*cp != 0) {
(void) fprintf(stderr,
"'%s': unknown argument ('send %s ?' for help).\n",
name, cmd);
return (0);
} else if (val < 0 || val > 255) {
(void) fprintf(stderr,
"'%s': bad value ('send %s ?' for help).\n",
name, cmd);
return (0);
}
}
if (!connected) {
(void) printf("?Need to be connected first.\n");
return (0);
}
(*func)(val, 1);
return (1);
}
static int
send_help()
{
struct sendlist *s; /* pointer to current command */
for (s = Sendlist; s->name; s++) {
if (s->help)
(void) printf("%-15s %s\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()
{
donelclchars = 1;
return (1);
}
static int
togdebug()
{
if (net > 0 &&
(SetSockOpt(net, SOL_SOCKET, SO_DEBUG, debug)) < 0) {
perror("setsockopt (SO_DEBUG)");
}
return (1);
}
static int
togcrlf()
{
if (crlf) {
(void) printf(
"Will send carriage returns as telnet <CR><LF>.\n");
} else {
(void) printf(
"Will send carriage returns as telnet <CR><NUL>.\n");
}
return (1);
}
static int binmode;
static int
togbinary(val)
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)) {
(void) printf("Already operating in binary mode "
"with remote host.\n");
} else {
(void) printf(
"Negotiating binary mode with remote host.\n");
tel_enter_binary(3);
}
} else {
if (my_want_state_is_wont(TELOPT_BINARY) &&
my_want_state_is_dont(TELOPT_BINARY)) {
(void) printf("Already in network ascii mode "
"with remote host.\n");
} else {
(void) printf("Negotiating network ascii mode "
"with remote host.\n");
tel_leave_binary(3);
}
}
return (1);
}
static int
togrbinary(val)
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)) {
(void) printf("Already receiving in binary mode.\n");
} else {
(void) printf("Negotiating binary mode on input.\n");
tel_enter_binary(1);
}
} else {
if (my_want_state_is_dont(TELOPT_BINARY)) {
(void) printf(
"Already receiving in network ascii mode.\n");
} else {
(void) printf(
"Negotiating network ascii mode on input.\n");
tel_leave_binary(1);
}
}
return (1);
}
static int
togxbinary(val)
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)) {
(void) printf("Already transmitting in binary mode.\n");
} else {
(void) printf("Negotiating binary mode on output.\n");
tel_enter_binary(2);
}
} else {
if (my_want_state_is_wont(TELOPT_BINARY)) {
(void) printf(
"Already transmitting in network ascii mode.\n");
} else {
(void) printf(
"Negotiating network ascii mode on output.\n");
tel_leave_binary(2);
}
}
return (1);
}
static int togglehelp(void);
extern int auth_togdebug(int);
struct togglelist {
char *name; /* name of toggle */
char *help; /* help message */
int (*handler)(); /* routine to do actual setting */
int *variable;
char *actionexplanation;
};
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 and/or authentication info",
0,
&autologin,
"send login name and/or authentication information" },
{ "authdebug",
"authentication debugging",
auth_togdebug,
0,
"print authentication debugging information" },
{ "autoencrypt",
"automatic encryption of data stream",
EncryptAutoEnc,
0,
"automatically encrypt output" },
{ "autodecrypt",
"automatic decryption of data stream",
EncryptAutoDec,
0,
"automatically decrypt input" },
{ "verbose_encrypt",
"verbose encryption output",
EncryptVerbose,
0,
"print verbose encryption output" },
{ "encdebug",
"encryption debugging",
EncryptDebug,
0,
"print encryption debugging information" },
{ "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 }, /* empty line */
{ "debug",
"debugging",
togdebug,
&debug,
"turn on socket level debugging" },
{ "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()
{
struct togglelist *c;
for (c = Togglelist; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf(
"%-15s toggle %s\n", c->name, c->help);
else
(void) printf("\n");
}
}
(void) printf("\n");
(void) printf("%-15s %s\n", "?", "display help information");
return (0);
}
static void
settogglehelp(set)
int set;
{
struct togglelist *c;
for (c = Togglelist; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s %s\n", c->name,
set ? "enable" : "disable", c->help);
else
(void) printf("\n");
}
}
}
#define GETTOGGLE(name) (struct togglelist *) \
genget(name, (char **)Togglelist, sizeof (struct togglelist))
static int
toggle(argc, argv)
int argc;
char *argv[];
{
int retval = 1;
char *name;
struct togglelist *c;
if (argc < 2) {
(void) fprintf(stderr,
"Need an argument to 'toggle' command. "
"'toggle ?' for help.\n");
return (0);
}
argc--;
argv++;
while (argc--) {
name = *argv++;
c = GETTOGGLE(name);
if (Ambiguous(c)) {
(void) fprintf(stderr, "'%s': ambiguous argument "
"('toggle ?' for help).\n", name);
return (0);
} else if (c == 0) {
(void) fprintf(stderr, "'%s': unknown argument "
"('toggle ?' for help).\n", name);
return (0);
} else {
if (c->variable) {
*c->variable = !*c->variable; /* invert it */
if (c->actionexplanation) {
(void) printf("%s %s.\n",
*c->variable ? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler) {
retval &= (*c->handler)(-1);
}
}
}
return (retval);
}
/*
* The following perform the "set" command.
*/
#ifdef USE_TERMIO
struct termio new_tc = { 0 };
#endif
struct setlist {
char *name; /* name */
char *help; /* help information */
void (*handler)();
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 },
{ "tracefile", "file to write trace information to", SetNetTrace,
(cc_t *)NetTraceFile},
{ " ", "" },
{ " ", "The following need 'localchars' to be toggled true", 0, 0 },
{ "flushoutput", "character to cause an Abort Output", 0,
termFlushCharp },
{ "interrupt", "character to cause an Interrupt Process", 0,
termIntCharp },
{ "quit", "character to cause an Abort process", 0, termQuitCharp },
{ "eof", "character to cause an EOF ", 0, termEofCharp },
{ " ", "" },
{ " ", "The following are for local editing in linemode", 0, 0 },
{ "erase", "character to use to erase a character", 0, termEraseCharp },
{ "kill", "character to use to erase a line", 0, termKillCharp },
{ "lnext", "character to use for literal next", 0,
termLiteralNextCharp },
{ "susp", "character to cause a Suspend Process", 0, termSuspCharp },
{ "reprint", "character to use for line reprint", 0, termRprntCharp },
{ "worderase", "character to use to erase a word", 0, termWerasCharp },
{ "start", "character to use for XON", 0, termStartCharp },
{ "stop", "character to use for XOFF", 0, termStopCharp },
{ "forw1", "alternate end of line character", 0, termForw1Charp },
{ "forw2", "alternate end of line character", 0, termForw2Charp },
{ "ayt", "alternate AYT character", 0, termAytCharp },
{ 0 }
};
static struct setlist *
getset(name)
char *name;
{
return ((struct setlist *)
genget(name, (char **)Setlist, sizeof (struct setlist)));
}
void
set_escape_char(s)
char *s;
{
if (rlogin != _POSIX_VDISABLE) {
rlogin = (s && *s) ? special(s) : _POSIX_VDISABLE;
(void) printf("Telnet rlogin escape character is '%s'.\n",
control(rlogin));
} else {
escape = (s && *s) ? special(s) : _POSIX_VDISABLE;
(void) printf("Telnet escape character is '%s'.\n",
esc_control(escape));
}
}
static int
setcmd(argc, argv)
int argc;
char *argv[];
{
int value;
struct setlist *ct;
struct togglelist *c;
if (argc < 2 || argc > 3) {
(void) printf(
"Format is 'set Name Value'\n'set ?' for help.\n");
return (0);
}
if ((argc == 2) &&
(isprefix(argv[1], "?") || isprefix(argv[1], "help"))) {
for (ct = Setlist; ct->name; ct++)
(void) printf("%-15s %s\n", ct->name, ct->help);
(void) printf("\n");
settogglehelp(1);
(void) printf("%-15s %s\n", "?", "display help information");
return (0);
}
ct = getset(argv[1]);
if (ct == 0) {
c = GETTOGGLE(argv[1]);
if (c == 0) {
(void) fprintf(stderr, "'%s': unknown argument "
"('set ?' for help).\n", argv[1]);
return (0);
} else if (Ambiguous(c)) {
(void) fprintf(stderr, "'%s': ambiguous argument "
"('set ?' for help).\n", argv[1]);
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 {
(void) printf(
"Format is 'set togglename [on|off]'\n"
"'set ?' for help.\n");
return (0);
}
if (c->actionexplanation) {
(void) printf("%s %s.\n",
*c->variable? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler)
(*c->handler)(1);
} else if (argc != 3) {
(void) printf(
"Format is 'set Name Value'\n'set ?' for help.\n");
return (0);
} else if (Ambiguous(ct)) {
(void) fprintf(stderr,
"'%s': ambiguous argument ('set ?' for help).\n", argv[1]);
return (0);
} else if (ct->handler) {
(*ct->handler)(argv[2]);
(void) printf(
"%s set to \"%s\".\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;
(void) printf("%s character is '%s'.\n", ct->name,
control(*(ct->charp)));
}
slc_check();
return (1);
}
static int
unsetcmd(argc, argv)
int argc;
char *argv[];
{
struct setlist *ct;
struct togglelist *c;
register char *name;
if (argc < 2) {
(void) fprintf(stderr, "Need an argument to 'unset' command. "
"'unset ?' for help.\n");
return (0);
}
if (isprefix(argv[1], "?") || isprefix(argv[1], "help")) {
for (ct = Setlist; ct->name; ct++)
(void) printf("%-15s %s\n", ct->name, ct->help);
(void) printf("\n");
settogglehelp(0);
(void) printf("%-15s %s\n", "?", "display help information");
return (0);
}
argc--;
argv++;
while (argc--) {
name = *argv++;
ct = getset(name);
if (ct == 0) {
c = GETTOGGLE(name);
if (c == 0) {
(void) fprintf(stderr, "'%s': unknown argument "
"('unset ?' for help).\n", name);
return (0);
} else if (Ambiguous(c)) {
(void) fprintf(stderr,
"'%s': ambiguous argument "
"('unset ?' for help).\n", name);
return (0);
}
if (c->variable) {
*c->variable = 0;
if (c->actionexplanation) {
(void) printf("%s %s.\n",
*c->variable? "Will" : "Won't",
c->actionexplanation);
}
}
if (c->handler)
(*c->handler)(0);
} else if (Ambiguous(ct)) {
(void) fprintf(stderr, "'%s': ambiguous argument "
"('unset ?' for help).\n", name);
return (0);
} else if (ct->handler) {
(*ct->handler)(0);
(void) printf("%s reset to \"%s\".\n", ct->name,
(char *)ct->charp);
} else {
*(ct->charp) = _POSIX_VDISABLE;
(void) printf("%s character is '%s'.\n", ct->name,
control(*(ct->charp)));
}
}
return (1);
}
/*
* The following are the data structures and routines for the
* 'mode' command.
*/
extern int reqd_linemode;
#ifdef KLUDGELINEMODE
extern int kludgelinemode;
static int
dokludgemode()
{
kludgelinemode = 1;
send_wont(TELOPT_LINEMODE, 1);
send_dont(TELOPT_SGA, 1);
send_dont(TELOPT_ECHO, 1);
/*
* If processing the .telnetrc file, keep track of linemode and/or
* kludgelinemode requests which are processed before initial option
* negotiations occur.
*/
if (doing_rc)
reqd_linemode = 1;
return (1);
}
#endif
static int
dolinemode()
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
send_dont(TELOPT_SGA, 1);
#endif
send_will(TELOPT_LINEMODE, 1);
send_dont(TELOPT_ECHO, 1);
/*
* If processing the .telnetrc file, keep track of linemode and/or
* kludgelinemode requests which are processed before initial option
* negotiations occur.
*/
if (doing_rc)
reqd_linemode = 1;
return (1);
}
static int
docharmode()
{
#ifdef KLUDGELINEMODE
if (kludgelinemode)
send_do(TELOPT_SGA, 1);
else
#endif
send_wont(TELOPT_LINEMODE, 1);
send_do(TELOPT_ECHO, 1);
reqd_linemode = 0;
return (1);
}
static int
dolmmode(bit, on)
int bit, on;
{
unsigned char c;
extern int linemode;
if (my_want_state_is_wont(TELOPT_LINEMODE)) {
(void) printf("?Need to have LINEMODE option enabled first.\n");
(void) printf("'mode ?' for help.\n");
return (0);
}
if (on)
c = (linemode | bit);
else
c = (linemode & ~bit);
lm_mode(&c, 1, 1);
return (1);
}
static int
setmode(bit)
{
return (dolmmode(bit, 1));
}
static int
clearmode(bit)
{
return (dolmmode(bit, 0));
}
struct modelist {
char *name; /* command name */
char *help; /* help string */
int (*handler)(); /* routine which executes command */
int needconnect; /* Do we need to be connected to execute? */
int arg1;
};
static int modehelp();
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", setmode, 1, MODE_TRAPSIG },
{ "+isig", 0, setmode, 1, MODE_TRAPSIG },
{ "-isig", "Disable signal trapping", clearmode, 1, MODE_TRAPSIG },
{ "edit", "Enable character editing", setmode, 1, MODE_EDIT },
{ "+edit", 0, setmode, 1, MODE_EDIT },
{ "-edit", "Disable character editing", clearmode, 1, MODE_EDIT },
{ "softtabs", "Enable tab expansion", setmode, 1, MODE_SOFT_TAB },
{ "+softtabs", 0, setmode, 1, MODE_SOFT_TAB },
{ "-softtabs", "Disable tab expansion",
clearmode, 1, MODE_SOFT_TAB },
{ "litecho", "Enable literal character echo",
setmode, 1, MODE_LIT_ECHO },
{ "+litecho", 0, setmode, 1, MODE_LIT_ECHO },
{ "-litecho", "Disable literal character echo", 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()
{
struct modelist *mt;
(void) printf("format is: 'mode Mode', where 'Mode' is one of:\n\n");
for (mt = ModeList; mt->name; mt++) {
if (mt->help) {
if (*mt->help)
(void) printf("%-15s %s\n", mt->name, mt->help);
else
(void) printf("\n");
}
}
return (0);
}
#define GETMODECMD(name) (struct modelist *) \
genget(name, (char **)ModeList, sizeof (struct modelist))
static int
modecmd(argc, argv)
int argc;
char *argv[];
{
struct modelist *mt;
if (argc != 2) {
(void) printf("'mode' command requires an argument\n");
(void) printf("'mode ?' for help.\n");
} else if ((mt = GETMODECMD(argv[1])) == 0) {
(void) fprintf(stderr,
"Unknown mode '%s' ('mode ?' for help).\n", argv[1]);
} else if (Ambiguous(mt)) {
(void) fprintf(stderr,
"Ambiguous mode '%s' ('mode ?' for help).\n", argv[1]);
} else if (mt->needconnect && !connected) {
(void) printf("?Need to be connected first.\n");
(void) printf("'mode ?' for help.\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(argc, argv)
int argc;
char *argv[];
{
struct togglelist *tl;
struct setlist *sl;
#define dotog(tl) if (tl->variable && tl->actionexplanation) { \
if (*tl->variable) { \
(void) printf("will"); \
} else { \
(void) printf("won't"); \
} \
(void) printf(" %s.\n", tl->actionexplanation); \
}
#define doset(sl) if (sl->name && *sl->name != ' ') { \
if (sl->handler == 0) \
(void) printf("%-15s [%s]\n", sl->name, \
control(*sl->charp)); \
else \
(void) printf("%-15s \"%s\"\n", sl->name, \
(char *)sl->charp); \
}
if (argc == 1) {
for (tl = Togglelist; tl->name; tl++) {
dotog(tl);
}
(void) printf("\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)) {
(void) printf(
"?Ambiguous argument '%s'.\n", argv[i]);
return (0);
} else if (!sl && !tl) {
(void) printf(
"?Unknown argument '%s'.\n", argv[i]);
return (0);
} else {
if (tl) {
dotog(tl);
}
if (sl) {
doset(sl);
}
}
}
}
optionstatus();
(void) EncryptStatus();
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(argc, argv)
int argc;
char *argv[];
{
register char *arg;
char *buf = NULL;
if (argc > 2)
arg = argv[1];
else {
(void) printf("new escape character: ");
if (GetString(&buf, NULL, stdin) == NULL) {
if (!feof(stdin)) {
perror("can't set escape character");
goto setescape_exit;
}
}
arg = buf;
}
/* we place no limitations on what escape can be. */
escape = arg[0];
(void) printf("Escape character is '%s'.\n", esc_control(escape));
(void) fflush(stdout);
setescape_exit:
Free(&buf);
return (1);
}
/*ARGSUSED*/
static int
togcrmod(argc, argv)
int argc;
char *argv[];
{
crmod = !crmod;
(void) printf(
"%s map carriage return on output.\n", crmod ? "Will" : "Won't");
(void) fflush(stdout);
return (1);
}
/*ARGSUSED*/
static int
suspend(argc, argv)
int argc;
char *argv[];
{
setcommandmode();
{
unsigned short oldrows, oldcols, newrows, newcols;
int 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);
}
/*ARGSUSED*/
static int
shell(argc, argv)
int argc;
char *argv[];
{
unsigned short oldrows, oldcols, newrows, newcols;
int err;
setcommandmode();
err = (TerminalWindowSize(&oldrows, &oldcols) == 0) ? 1 : 0;
switch (vfork()) {
case -1:
perror("Fork failed\n");
break;
case 0:
{
/*
* Fire up the shell in the child.
*/
register char *shellp, *shellname;
shellp = getenv("SHELL");
if (shellp == NULL)
shellp = "/bin/sh";
if ((shellname = strrchr(shellp, '/')) == 0)
shellname = shellp;
else
shellname++;
if (argc > 1)
(void) execl(shellp, shellname, "-c", argv[1], 0);
else
(void) execl(shellp, shellname, 0);
perror("Execl");
_exit(EXIT_FAILURE);
}
default:
(void) wait((int *)0); /* Wait for the shell to complete */
if (TerminalWindowSize(&newrows, &newcols) && connected &&
(err || ((oldrows != newrows) || (oldcols != newcols)))) {
sendnaws();
}
break;
}
return (1);
}
static int
bye(argc, argv)
int argc; /* Number of arguments */
char *argv[]; /* arguments */
{
extern int resettermname;
if (connected) {
(void) shutdown(net, 2);
(void) printf("Connection to %.*s closed.\n", MAXHOSTNAMELEN,
hostname);
Close(&net);
connected = 0;
resettermname = 1;
/* reset options */
(void) tninit();
}
if ((argc != 2) || (strcmp(argv[1], "fromquit") != 0)) {
longjmp(toplevel, 1);
/* NOTREACHED */
}
return (1); /* Keep lint, etc., happy */
}
/*VARARGS*/
int
quit()
{
(void) call(3, bye, "bye", "fromquit");
Exit(EXIT_SUCCESS);
/*NOTREACHED*/
return (1);
}
/*ARGSUSED*/
static int
logout(argc, argv)
int argc;
char *argv[];
{
send_do(TELOPT_LOGOUT, 1);
(void) netflush();
return (1);
}
/*
* The SLC command.
*/
struct slclist {
char *name;
char *help;
void (*handler)();
int arg;
};
static void slc_help();
static 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()
{
struct slclist *c;
for (c = SlcList; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s\n", c->name, c->help);
else
(void) printf("\n");
}
}
}
static struct slclist *
getslc(name)
char *name;
{
return ((struct slclist *)
genget(name, (char **)SlcList, sizeof (struct slclist)));
}
static int
slccmd(argc, argv)
int argc;
char *argv[];
{
struct slclist *c;
if (argc != 2) {
(void) fprintf(stderr,
"Need an argument to 'slc' command. 'slc ?' for help.\n");
return (0);
}
c = getslc(argv[1]);
if (c == 0) {
(void) fprintf(stderr,
"'%s': unknown argument ('slc ?' for help).\n",
argv[1]);
return (0);
}
if (Ambiguous(c)) {
(void) fprintf(stderr,
"'%s': ambiguous argument ('slc ?' for help).\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 struct env_lst *env_define(unsigned char *, unsigned char *);
static void env_undefine(unsigned char *);
static void env_export(unsigned char *);
static void env_unexport(unsigned char *);
static void env_send(unsigned char *);
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
static void env_varval(unsigned char *);
#endif
static void env_list(void);
static void env_help(void);
static 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 },
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
{ "varval", "Reverse VAR and VALUE (auto, right, wrong, status)",
env_varval, 1 },
#endif
{ "help", 0, env_help, 0 },
{ "?", "Print help information", env_help, 0 },
{ 0 },
};
static void
env_help()
{
struct envlist *c;
for (c = EnvList; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s\n", c->name, c->help);
else
(void) printf("\n");
}
}
}
static struct envlist *
getenvcmd(name)
char *name;
{
return ((struct envlist *)
genget(name, (char **)EnvList, sizeof (struct envlist)));
}
static int
env_cmd(argc, argv)
int argc;
char *argv[];
{
struct envlist *c;
if (argc < 2) {
(void) fprintf(stderr,
"Need an argument to 'environ' command. "
"'environ ?' for help.\n");
return (0);
}
c = getenvcmd(argv[1]);
if (c == 0) {
(void) fprintf(stderr, "'%s': unknown argument "
"('environ ?' for help).\n", argv[1]);
return (0);
}
if (Ambiguous(c)) {
(void) fprintf(stderr, "'%s': ambiguous argument "
"('environ ?' for help).\n", argv[1]);
return (0);
}
if (c->narg + 2 != argc) {
(void) fprintf(stderr,
"Need %s%d argument%s to 'environ %s' command. "
"'environ ?' for help.\n",
c->narg + 2 < argc ? "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 */
unsigned char *var; /* pointer to variable name */
unsigned char *value; /* pointer to variable value */
int export; /* 1 -> export with default list of variables */
int welldefined; /* A well defined variable */
};
static struct env_lst envlisthead;
static struct env_lst *
env_find(var)
unsigned char *var;
{
register struct env_lst *ep;
for (ep = envlisthead.next; ep; ep = ep->next) {
if (strcmp((char *)ep->var, (char *)var) == 0)
return (ep);
}
return (NULL);
}
int
env_init()
{
#ifdef lint
char **environ = NULL;
#else /* lint */
extern char **environ;
#endif /* lint */
char **epp, *cp;
struct env_lst *ep;
for (epp = environ; *epp; epp++) {
if (cp = strchr(*epp, '=')) {
*cp = '\0';
ep = env_define((unsigned char *)*epp,
(unsigned char *)cp+1);
if (ep == NULL)
return (0);
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((uchar_t *)"DISPLAY")) != NULL) &&
((*ep->value == ':') ||
(strncmp((char *)ep->value, "unix:", 5) == 0))) {
char hbuf[MAXHOSTNAMELEN];
char *cp2 = strchr((char *)ep->value, ':');
if (gethostname(hbuf, MAXHOSTNAMELEN) == -1) {
perror("telnet: cannot get hostname");
return (0);
}
hbuf[MAXHOSTNAMELEN-1] = '\0';
cp = malloc(strlen(hbuf) + strlen(cp2) + 1);
if (cp == NULL) {
perror("telnet: cannot define DISPLAY variable");
return (0);
}
(void) sprintf((char *)cp, "%s%s", hbuf, cp2);
free(ep->value);
ep->value = (unsigned char *)cp;
}
/*
* If LOGNAME is defined, but USER is not, then add
* USER with the value from LOGNAME. We do this because the "accepted
* practice" is to always pass USER on the wire, but SVR4 uses
* LOGNAME by default.
*/
if ((ep = env_find((uchar_t *)"LOGNAME")) != NULL &&
env_find((uchar_t *)"USER") == NULL) {
if (env_define((unsigned char *)"USER", ep->value) != NULL)
env_unexport((unsigned char *)"USER");
}
env_export((unsigned char *)"DISPLAY");
env_export((unsigned char *)"PRINTER");
return (1);
}
static struct env_lst *
env_define(var, value)
unsigned char *var, *value;
{
unsigned char *tmp_value;
unsigned char *tmp_var;
struct env_lst *ep;
/*
* Allocate copies of arguments first, to make cleanup easier
* in the case of allocation errors.
*/
tmp_var = (unsigned char *)strdup((char *)var);
if (tmp_var == NULL) {
perror("telnet: can't copy environment variable name");
return (NULL);
}
tmp_value = (unsigned char *)strdup((char *)value);
if (tmp_value == NULL) {
free(tmp_var);
perror("telnet: can't copy environment variable value");
return (NULL);
}
if (ep = env_find(var)) {
if (ep->var)
free(ep->var);
if (ep->value)
free(ep->value);
} else {
ep = malloc(sizeof (struct env_lst));
if (ep == NULL) {
perror("telnet: can't define environment variable");
free(tmp_var);
free(tmp_value);
return (NULL);
}
ep->next = envlisthead.next;
envlisthead.next = ep;
ep->prev = &envlisthead;
if (ep->next)
ep->next->prev = ep;
}
ep->welldefined = opt_welldefined((char *)var);
ep->export = 1;
ep->var = tmp_var;
ep->value = tmp_value;
return (ep);
}
static void
env_undefine(var)
unsigned char *var;
{
register struct env_lst *ep;
if (ep = env_find(var)) {
ep->prev->next = ep->next;
if (ep->next)
ep->next->prev = ep->prev;
if (ep->var)
free(ep->var);
if (ep->value)
free(ep->value);
free(ep);
}
}
static void
env_export(var)
unsigned char *var;
{
register struct env_lst *ep;
if (ep = env_find(var))
ep->export = 1;
}
static void
env_unexport(var)
unsigned char *var;
{
register struct env_lst *ep;
if (ep = env_find(var))
ep->export = 0;
}
static void
env_send(var)
unsigned char *var;
{
register struct env_lst *ep;
if (my_state_is_wont(TELOPT_NEW_ENVIRON)
#ifdef OLD_ENVIRON
/* old style */ && my_state_is_wont(TELOPT_OLD_ENVIRON)
#endif
/* no environ */) {
(void) fprintf(stderr,
"Cannot send '%s': Telnet ENVIRON option not enabled\n",
var);
return;
}
ep = env_find(var);
if (ep == 0) {
(void) fprintf(stderr,
"Cannot send '%s': variable not defined\n", var);
return;
}
env_opt_start_info();
env_opt_add(ep->var);
env_opt_end(0);
}
static void
env_list()
{
register struct env_lst *ep;
for (ep = envlisthead.next; ep; ep = ep->next) {
(void) printf("%c %-20s %s\n", ep->export ? '*' : ' ',
ep->var, ep->value);
}
}
unsigned char *
env_default(init, welldefined)
int init;
{
static struct env_lst *nep = NULL;
if (init) {
/* return value is not used */
nep = &envlisthead;
return (NULL);
}
if (nep) {
while ((nep = nep->next) != NULL) {
if (nep->export && (nep->welldefined == welldefined))
return (nep->var);
}
}
return (NULL);
}
unsigned char *
env_getvalue(var)
unsigned char *var;
{
register struct env_lst *ep;
if (ep = env_find(var))
return (ep->value);
return (NULL);
}
#if defined(OLD_ENVIRON) && defined(ENV_HACK)
static void
env_varval(what)
unsigned char *what;
{
extern int old_env_var, old_env_value, env_auto;
int len = strlen((char *)what);
if (len == 0)
goto unknown;
if (strncasecmp((char *)what, "status", len) == 0) {
if (env_auto)
(void) printf("%s%s", "VAR and VALUE are/will be ",
"determined automatically\n");
if (old_env_var == OLD_ENV_VAR)
(void) printf(
"VAR and VALUE set to correct definitions\n");
else
(void) printf(
"VAR and VALUE definitions are reversed\n");
} else if (strncasecmp((char *)what, "auto", len) == 0) {
env_auto = 1;
old_env_var = OLD_ENV_VALUE;
old_env_value = OLD_ENV_VAR;
} else if (strncasecmp((char *)what, "right", len) == 0) {
env_auto = 0;
old_env_var = OLD_ENV_VAR;
old_env_value = OLD_ENV_VALUE;
} else if (strncasecmp((char *)what, "wrong", len) == 0) {
env_auto = 0;
old_env_var = OLD_ENV_VALUE;
old_env_value = OLD_ENV_VAR;
} else {
unknown:
(void) printf(
"Unknown \"varval\" command. (\"auto\", \"right\", "
"\"wrong\", \"status\")\n");
}
}
#endif /* OLD_ENVIRON && ENV_HACK */
/*
* The AUTHENTICATE command.
*/
struct authlist {
char *name;
char *help;
int (*handler)();
int narg;
};
extern int auth_enable(char *);
extern int auth_disable(char *);
extern int auth_status(void);
static int auth_help(void);
static struct authlist AuthList[] = {
{ "status",
"Display current status of authentication information",
auth_status, 0 },
{ "disable",
"Disable an authentication type ('auth disable ?' for more)",
auth_disable, 1 },
{ "enable",
"Enable an authentication type ('auth enable ?' for more)",
auth_enable, 1 },
{ "help", 0, auth_help, 0 },
{ "?", "Print help information", auth_help, 0 },
{ 0 },
};
static int
auth_help(void)
{
struct authlist *c;
for (c = AuthList; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s\n", c->name, c->help);
else
(void) printf("\n");
}
}
return (0);
}
static int
auth_cmd(argc, argv)
int argc;
char *argv[];
{
struct authlist *c;
if (argc < 2) {
(void) fprintf(stderr, "Need an argument to 'auth' "
"command. 'auth ?' for help.\n");
return (0);
}
c = (struct authlist *)
genget(argv[1], (char **)AuthList, sizeof (struct authlist));
if (c == 0) {
(void) fprintf(stderr,
"'%s': unknown argument ('auth ?' for help).\n",
argv[1]);
return (0);
}
if (Ambiguous(c)) {
(void) fprintf(stderr,
"'%s': ambiguous argument ('auth ?' for help).\n", argv[1]);
return (0);
}
if (c->narg + 2 != argc) {
(void) fprintf(stderr,
"Need %s%d argument%s to 'auth %s' command."
" 'auth ?' for help.\n",
c->narg + 2 < argc ? "only " : "",
c->narg, c->narg == 1 ? "" : "s", c->name);
return (0);
}
return ((*c->handler)(argv[2], argv[3]));
}
/*
* The FORWARD command.
*/
extern int forward_flags;
struct forwlist {
char *name;
char *help;
int (*handler)();
int f_flags;
};
static int forw_status(void);
static int forw_set(int);
static int forw_help(void);
static struct forwlist ForwList[] = {
{"status",
"Display current status of credential forwarding",
forw_status, 0},
{"disable",
"Disable credential forwarding",
forw_set, 0},
{"enable",
"Enable credential forwarding",
forw_set, OPTS_FORWARD_CREDS},
{"forwardable",
"Enable credential forwarding of "
"forwardable credentials",
forw_set, OPTS_FORWARD_CREDS | OPTS_FORWARDABLE_CREDS},
{"help",
0,
forw_help, 0},
{"?",
"Print help information",
forw_help, 0},
{0},
};
static int
forw_status(void)
{
if (forward_flags & OPTS_FORWARD_CREDS) {
if (forward_flags & OPTS_FORWARDABLE_CREDS)
(void) printf(gettext(
"Credential forwarding of "
"forwardable credentials enabled\n"));
else
(void) printf(gettext(
"Credential forwarding enabled\n"));
} else
(void) printf(gettext("Credential forwarding disabled\n"));
return (0);
}
static int
forw_set(int f_flags)
{
forward_flags = f_flags;
return (0);
}
static int
forw_help(void)
{
struct forwlist *c;
for (c = ForwList; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s\r\n", c->name, c->help);
else
(void) printf("\n");
}
}
return (0);
}
static int
forw_cmd(int argc, char *argv[])
{
struct forwlist *c;
if (argc < 2) {
(void) fprintf(stderr, gettext(
"Need an argument to 'forward' "
"command. 'forward ?' for help.\n"));
return (0);
}
c = (struct forwlist *)genget(argv[1], (char **)ForwList,
sizeof (struct forwlist));
if (c == 0) {
(void) fprintf(stderr, gettext(
"'%s': unknown argument ('forward ?' for help).\n"),
argv[1]);
return (0);
}
if (Ambiguous(c)) {
(void) fprintf(stderr, gettext(
"'%s': ambiguous argument ('forward ?' for help).\n"),
argv[1]);
return (0);
}
if (argc != 2) {
(void) fprintf(stderr, gettext(
"No arguments needed to 'forward %s' command. "
"'forward ?' for help.\n"), c->name);
return (0);
}
return ((*c->handler) (c->f_flags));
}
/*
* The ENCRYPT command.
*/
struct encryptlist {
char *name;
char *help;
int (*handler)();
int needconnect;
int minarg;
int maxarg;
};
static int EncryptHelp(void);
static struct encryptlist EncryptList[] = {
{ "enable", "Enable encryption. ('encrypt enable ?' for more)",
EncryptEnable, 1, 1, 2 },
{ "disable", "Disable encryption. ('encrypt disable ?' for more)",
EncryptDisable, 0, 1, 2 },
{ "type", "Set encryption type. ('encrypt type ?' for more)",
EncryptType, 0, 1, 2 },
{ "start", "Start encryption. ('encrypt start ?' for more)",
EncryptStart, 1, 0, 1 },
{ "stop", "Stop encryption. ('encrypt stop ?' for more)",
EncryptStop, 1, 0, 1 },
{ "input", "Start encrypting the input stream",
EncryptStartInput, 1, 0, 0 },
{ "-input", "Stop encrypting the input stream",
EncryptStopInput, 1, 0, 0 },
{ "output", "Start encrypting the output stream",
EncryptStartOutput, 1, 0, 0 },
{ "-output", "Stop encrypting the output stream",
EncryptStopOutput, 1, 0, 0 },
{ "status", "Display current status of encryption information",
EncryptStatus, 0, 0, 0 },
{ "help", 0,
EncryptHelp, 0, 0, 0 },
{ "?", "Print help information", EncryptHelp, 0, 0, 0 },
{ 0 },
};
static int
EncryptHelp(void)
{
struct encryptlist *c;
for (c = EncryptList; c->name; c++) {
if (c->help) {
if (*c->help)
(void) printf("%-15s %s\n", c->name, c->help);
else
(void) printf("\n");
}
}
return (0);
}
static int
encrypt_cmd(int argc, char *argv[])
{
struct encryptlist *c;
if (argc < 2) {
(void) fprintf(stderr, gettext(
"Need an argument to 'encrypt' command. "
"'encrypt ?' for help.\n"));
return (0);
}
c = (struct encryptlist *)
genget(argv[1], (char **)EncryptList, sizeof (struct encryptlist));
if (c == 0) {
(void) fprintf(stderr, gettext(
"'%s': unknown argument ('encrypt ?' for help).\n"),
argv[1]);
return (0);
}
if (Ambiguous(c)) {
(void) fprintf(stderr, gettext(
"'%s': ambiguous argument ('encrypt ?' for help).\n"),
argv[1]);
return (0);
}
argc -= 2;
if (argc < c->minarg || argc > c->maxarg) {
if (c->minarg == c->maxarg) {
(void) fprintf(stderr, gettext("Need %s%d %s "),
c->minarg < argc ?
gettext("only ") : "", c->minarg,
c->minarg == 1 ?
gettext("argument") : gettext("arguments"));
} else {
(void) fprintf(stderr,
gettext("Need %s%d-%d arguments "),
c->maxarg < argc ?
gettext("only ") : "", c->minarg, c->maxarg);
}
(void) fprintf(stderr, gettext(
"to 'encrypt %s' command. 'encrypt ?' for help.\n"),
c->name);
return (0);
}
if (c->needconnect && !connected) {
if (!(argc &&
(isprefix(argv[2], "help") || isprefix(argv[2], "?")))) {
(void) printf(
gettext("?Need to be connected first.\n"));
return (0);
}
}
return ((*c->handler)(argc > 0 ? argv[2] : 0,
argc > 1 ? argv[3] : 0, argc > 2 ? argv[4] : 0));
}
/*
* Print status about the connection.
*/
static int
status(int argc, char *argv[])
{
if (connected) {
(void) printf("Connected to %s.\n", hostname);
if ((argc < 2) || strcmp(argv[1], "notmuch")) {
int mode = getconnmode();
if (my_want_state_is_will(TELOPT_LINEMODE)) {
(void) printf(
"Operating with LINEMODE option\n");
(void) printf(
"%s line editing\n", (mode&MODE_EDIT) ?
"Local" : "No");
(void) printf("%s catching of signals\n",
(mode&MODE_TRAPSIG) ? "Local" : "No");
slcstate();
#ifdef KLUDGELINEMODE
} else if (kludgelinemode &&
my_want_state_is_dont(TELOPT_SGA)) {
(void) printf(
"Operating in obsolete linemode\n");
#endif
} else {
(void) printf(
"Operating in single character mode\n");
if (localchars)
(void) printf(
"Catching signals locally\n");
}
(void) printf("%s character echo\n", (mode&MODE_ECHO) ?
"Local" : "Remote");
if (my_want_state_is_will(TELOPT_LFLOW))
(void) printf("%s flow control\n",
(mode&MODE_FLOW) ? "Local" : "No");
encrypt_display();
}
} else {
(void) printf("No connection.\n");
}
if (rlogin != _POSIX_VDISABLE)
(void) printf("Escape character is '%s'.\n", control(rlogin));
else
(void) printf(
"Escape character is '%s'.\n", esc_control(escape));
(void) fflush(stdout);
return (1);
}
/*
* Parse the user input (cmd_line_input) which should:
* - start with the target host, or with "@" or "!@" followed by at least one
* gateway.
* - each host (can be literal address or hostname) can be separated by ",",
* "@", or ",@".
* Note that the last host is the target, all the others (if any ) are the
* gateways.
*
* Returns: -1 if a library call fails, too many gateways, or parse
* error
* num_gw otherwise
* On successful return, hostname_list points to a list of hosts (last one being
* the target, others gateways), src_rtng_type points to the type of source
* routing (strict vs. loose)
*/
static int
parse_input(char *cmd_line_input, char **hostname_list, uchar_t *src_rtng_type)
{
char hname[MAXHOSTNAMELEN + 1];
char *cp;
int gw_count;
int i;
gw_count = 0;
cp = cmd_line_input;
/*
* Defining ICMD generates the Itelnet binary, the special version of
* telnet which is used with firewall proxy.
* If ICMD is defined, parse_input will treat the whole cmd_line_input
* as the target host and set the num_gw to 0. Therefore, none of the
* source routing related code paths will be executed.
*/
#ifndef ICMD
if (*cp == '@') {
*src_rtng_type = IPOPT_LSRR;
cp++;
} else if (*cp == '!') {
*src_rtng_type = IPOPT_SSRR;
/* "!" must be followed by '@' */
if (*(cp + 1) != '@')
goto parse_error;
cp += 2;
} else {
#endif /* ICMD */
/* no gateways, just the target */
hostname_list[0] = strdup(cp);
if (hostname_list[0] == NULL) {
perror("telnet: copying host name");
return (-1);
}
return (0);
#ifndef ICMD
}
while (*cp != '\0') {
/*
* Identify each gateway separated by ",", "@" or ",@" and
* store in hname[].
*/
i = 0;
while (*cp != '@' && *cp != ',' && *cp != '\0') {
hname[i++] = *cp++;
if (i > MAXHOSTNAMELEN)
goto parse_error;
}
hname[i] = '\0';
/*
* Two consecutive delimiters which result in a 0 length hname
* is a parse error.
*/
if (i == 0)
goto parse_error;
hostname_list[gw_count] = strdup(hname);
if (hostname_list[gw_count] == NULL) {
perror("telnet: copying hostname from list");
return (-1);
}
if (++gw_count > MAXMAX_GATEWAY) {
(void) fprintf(stderr, "telnet: too many gateways\n");
return (-1);
}
/* Jump over the next delimiter. */
if (*cp != '\0') {
/* ...gw1,@gw2... accepted */
if (*cp == ',' && *(cp + 1) == '@')
cp += 2;
else
cp++;
}
}
/* discount the target */
gw_count--;
/* Any input starting with '!@' or '@' must have at least one gateway */
if (gw_count <= 0)
goto parse_error;
return (gw_count);
parse_error:
(void) printf("Bad source route option: %s\n", cmd_line_input);
return (-1);
#endif /* ICMD */
}
/*
* Resolves the target and gateway addresses, determines what type of addresses
* (ALL_ADDRS, ONLY_V6, ONLY_V4) telnet will be trying to connect.
*
* Returns: pointer to resolved target if name resolutions succeed
* NULL if name resolutions fail or
* a library function call fails
*
* The last host in the hostname_list is the target. After resolving the target,
* determines for what type of addresses it should try to resolve gateways. It
* resolves gateway addresses and picks one address for each desired address
* type and stores in the array pointed by gw_addrsp. Also, this 'type of
* addresses' is pointed by addr_type argument on successful return.
*/
static struct addrinfo *
resolve_hosts(char **hostname_list, int num_gw, struct gateway **gw_addrsp,
int *addr_type, const char *portp)
{
struct gateway *gw_addrs = NULL;
struct gateway *gw;
/* whether we already picked an IPv4 address for the current gateway */
boolean_t got_v4_addr;
boolean_t got_v6_addr;
/* whether we need to get an IPv4 address for the current gateway */
boolean_t need_v4_addr = B_FALSE;
boolean_t need_v6_addr = B_FALSE;
int res_failed_at4; /* save which gateway failed to resolve */
int res_failed_at6;
boolean_t is_v4mapped;
struct in6_addr *v6addrp;
struct in_addr *v4addrp;
int error_num;
int i;
int rc;
struct addrinfo *res, *host, *gateway, *addr;
struct addrinfo hints;
*addr_type = ALL_ADDRS;
memset(&hints, 0, sizeof (hints));
hints.ai_flags = AI_CANONNAME; /* used for config files, diags */
hints.ai_socktype = SOCK_STREAM;
rc = getaddrinfo(hostname_list[num_gw],
(portp != NULL) ? portp : "telnet", &hints, &res);
if (rc != 0) {
if (hostname_list[num_gw] != NULL &&
*hostname_list[num_gw] != '\0')
(void) fprintf(stderr, "%s: ", hostname_list[num_gw]);
(void) fprintf(stderr, "%s\n", gai_strerror(rc));
return (NULL);
}
/*
* Let's see what type of addresses we got for the target. This
* determines what type of addresses we'd like to resolve gateways
* later.
*/
for (host = res; host != NULL; host = host->ai_next) {
struct sockaddr_in6 *s6;
s6 = (struct sockaddr_in6 *)host->ai_addr;
if (host->ai_addr->sa_family == AF_INET ||
IN6_IS_ADDR_V4MAPPED(&s6->sin6_addr))
need_v4_addr = B_TRUE;
else
need_v6_addr = B_TRUE;
/*
* Let's stop after seeing we need both IPv6 and IPv4.
*/
if (need_v4_addr && need_v6_addr)
break;
}
if (num_gw > 0) {
/*
* In the prepare_optbuf(), we'll store the IPv4 address of the
* target in the last slot of gw_addrs array. Therefore we need
* space for num_gw+1 hosts.
*/
gw_addrs = calloc(num_gw + 1, sizeof (struct gateway));
if (gw_addrs == NULL) {
perror("telnet: calloc");
freeaddrinfo(res);
return (NULL);
}
}
/*
* Now we'll go through all the gateways and try to resolve them to
* the desired address types.
*/
gw = gw_addrs;
/* -1 means 'no address resolution failure yet' */
res_failed_at4 = -1;
res_failed_at6 = -1;
for (i = 0; i < num_gw; i++) {
rc = getaddrinfo(hostname_list[i], NULL, NULL, &gateway);
if (rc != 0) {
if (hostname_list[i] != NULL &&
*hostname_list[i] != '\0')
(void) fprintf(stderr, "%s: ",
hostname_list[i]);
(void) fprintf(stderr, "bad address\n");
return (NULL);
}
/*
* Initially we have no address of any type for this gateway.
*/
got_v6_addr = B_FALSE;
got_v4_addr = B_FALSE;
/*
* Let's go through all the addresses of this gateway.
* Use the first address which matches the needed family.
*/
for (addr = gateway; addr != NULL; addr = addr->ai_next) {
/*LINTED*/
v6addrp = &((struct sockaddr_in6 *)addr->ai_addr)->
sin6_addr;
v4addrp = &((struct sockaddr_in *)addr->ai_addr)->
sin_addr;
if (addr->ai_family == AF_INET6)
is_v4mapped = IN6_IS_ADDR_V4MAPPED(v6addrp);
else
is_v4mapped = B_FALSE;
/*
* If we need to determine an IPv4 address and haven't
* found one yet and this is a IPv4-mapped IPv6 address,
* then bingo!
*/
if (need_v4_addr && !got_v4_addr) {
if (is_v4mapped) {
IN6_V4MAPPED_TO_INADDR(v6addrp,
&gw->gw_addr);
got_v4_addr = B_TRUE;
} else if (addr->ai_family = AF_INET) {
gw->gw_addr = *v4addrp;
got_v4_addr = B_TRUE;
}
}
if (need_v6_addr && !got_v6_addr &&
addr->ai_family == AF_INET6) {
gw->gw_addr6 = *v6addrp;
got_v6_addr = B_TRUE;
}
/*
* Let's stop if we got all what we looked for.
*/
if ((!need_v4_addr || got_v4_addr) &&
(!need_v6_addr || got_v6_addr))
break;
}
/*
* We needed an IPv4 address for this gateway but couldn't
* find one.
*/
if (need_v4_addr && !got_v4_addr) {
res_failed_at4 = i;
/*
* Since we couldn't resolve a gateway to IPv4 address
* we can't use IPv4 at all. Therefore we no longer
* need IPv4 addresses for any of the gateways.
*/
need_v4_addr = B_FALSE;
}
if (need_v6_addr && !got_v6_addr) {
res_failed_at6 = i;
need_v6_addr = B_FALSE;
}
/*
* If some gateways don't resolve to any of the desired
* address types, we fail.
*/
if (!need_v4_addr && !need_v6_addr) {
if (res_failed_at6 != -1) {
(void) fprintf(stderr,
"%s: Host doesn't have any IPv6 address\n",
hostname_list[res_failed_at6]);
}
if (res_failed_at4 != -1) {
(void) fprintf(stderr,
"%s: Host doesn't have any IPv4 address\n",
hostname_list[res_failed_at4]);
}
free(gw_addrs);
return (NULL);
}
gw++;
}
*gw_addrsp = gw_addrs;
/*
* When we get here, need_v4_addr and need_v6_addr have their final
* values based on the name resolution of the target and gateways.
*/
if (need_v4_addr && need_v6_addr)
*addr_type = ALL_ADDRS;
else if (need_v4_addr && !need_v6_addr)
*addr_type = ONLY_V4;
else if (!need_v4_addr && need_v6_addr)
*addr_type = ONLY_V6;
return (res);
}
/*
* Initializes the buffer pointed by opt_bufpp for a IPv4 option of type
* src_rtng_type using the gateway addresses stored in gw_addrs. If no buffer
* is passed, it allocates one. If a buffer is passed, checks if it's big
* enough.
* On return opt_buf_len points to the buffer length which we need later for the
* setsockopt() call, and opt_bufpp points to the newly allocated or already
* passed buffer. Returns B_FALSE if a library function call fails or passed
* buffer is not big enough, B_TRUE otherwise.
*/
static boolean_t
prepare_optbuf(struct gateway *gw_addrs, int num_gw, char **opt_bufpp,
size_t *opt_buf_len, struct in_addr *target, uchar_t src_rtng_type)
{
struct ip_sourceroute *sr_opt;
size_t needed_buflen;
int i;
/*
* We have (num_gw + 1) IP addresses in the buffer because the number
* of gateway addresses we put in the option buffer includes the target
* address.
* At the time of setsockopt() call, passed option length needs to be
* multiple of 4 bytes. Therefore we need one IPOPT_NOP before (or
* after) IPOPT_LSRR.
* 1 = preceding 1 byte of IPOPT_NOP
* 3 = 1 (code) + 1 (len) + 1 (ptr)
*/
needed_buflen = 1 + 3 + (num_gw + 1) * sizeof (struct in_addr);
if (*opt_bufpp != NULL) {
/* check if the passed buffer is big enough */
if (*opt_buf_len < needed_buflen) {
(void) fprintf(stderr,
"telnet: buffer too small for IPv4 source routing "
"option\n");
return (B_FALSE);
}
} else {
*opt_bufpp = malloc(needed_buflen);
if (*opt_bufpp == NULL) {
perror("telnet: malloc");
return (B_FALSE);
}
}
*opt_buf_len = needed_buflen;
/* final hop is the target */
gw_addrs[num_gw].gw_addr = *target;
*opt_bufpp[0] = IPOPT_NOP;
/* IPOPT_LSRR starts right after IPOPT_NOP */
sr_opt = (struct ip_sourceroute *)(*opt_bufpp + 1);
sr_opt->ipsr_code = src_rtng_type;
/* discount the 1 byte of IPOPT_NOP */
sr_opt->ipsr_len = needed_buflen - 1;
sr_opt->ipsr_ptr = IPOPT_MINOFF;
/* copy the gateways into the optlist */
for (i = 0; i < num_gw + 1; i++) {
(void) bcopy(&gw_addrs[i].gw_addr, &sr_opt->ipsr_addrs[i],
sizeof (struct in_addr));
}
return (B_TRUE);
}
/*
* Initializes the buffer pointed by opt_bufpp for a IPv6 routing header option
* using the gateway addresses stored in gw_addrs. If no buffer is passed, it
* allocates one. If a buffer is passed, checks if it's big enough.
* On return opt_buf_len points to the buffer length which we need later for the
* setsockopt() call, and opt_bufpp points to the newly allocated or already
* passed buffer. Returns B_FALSE if a library function call fails or passed
* buffer is not big enough, B_TRUE otherwise.
*/
static boolean_t
prepare_optbuf6(struct gateway *gw_addrs, int num_gw, char **opt_bufpp,
size_t *opt_buf_len)
{
char *opt_bufp;
size_t needed_buflen;
int i;
needed_buflen = inet6_rth_space(IPV6_RTHDR_TYPE_0, num_gw);
if (*opt_bufpp != NULL) {
/* check if the passed buffer is big enough */
if (*opt_buf_len < needed_buflen) {
(void) fprintf(stderr,
"telnet: buffer too small for IPv6 routing "
"header option\n");
return (B_FALSE);
}
} else {
*opt_bufpp = malloc(needed_buflen);
if (*opt_bufpp == NULL) {
perror("telnet: malloc");
return (B_FALSE);
}
}
*opt_buf_len = needed_buflen;
opt_bufp = *opt_bufpp;
/*
* Initialize the buffer to be used for IPv6 routing header type 0.
*/
if (inet6_rth_init(opt_bufp, needed_buflen, IPV6_RTHDR_TYPE_0,
num_gw) == NULL) {
perror("telnet: inet6_rth_init");
return (B_FALSE);
}
/*
* Add gateways one by one.
*/
for (i = 0; i < num_gw; i++) {
if (inet6_rth_add(opt_bufp, &gw_addrs[i].gw_addr6) == -1) {
perror("telnet: inet6_rth_add");
return (B_FALSE);
}
}
/* successful operation */
return (B_TRUE);
}
int
tn(argc, argv)
int argc;
char *argv[];
{
struct addrinfo *host = NULL;
struct addrinfo *h;
struct sockaddr_in6 sin6;
struct sockaddr_in sin;
struct in6_addr addr6;
struct in_addr addr;
void *addrp;
struct gateway *gw_addrs;
char *hostname_list[MAXMAX_GATEWAY + 1] = {NULL};
char *opt_buf6 = NULL; /* used for IPv6 routing header */
size_t opt_buf_len6 = 0;
uchar_t src_rtng_type; /* type of IPv4 source routing */
struct servent *sp = 0;
char *opt_buf = NULL; /* used for IPv4 source routing */
size_t opt_buf_len = 0;
char *cmd;
char *hostp = NULL;
char *portp = NULL;
char *user = NULL;
#ifdef ICMD
char *itelnet_host;
char *real_host;
unsigned short dest_port;
#endif /* ICMD */
/*
* The two strings at the end of this function are 24 and 39
* characters long (minus the %.*s in the format strings). Add
* one for the null terminator making the longest print string 40.
*/
char buf[MAXHOSTNAMELEN+40];
/*
* In the case of ICMD defined, dest_port will contain the real port
* we are trying to telnet to, and target_port will contain
* "telnet-passthru" port.
*/
unsigned short target_port;
char abuf[INET6_ADDRSTRLEN];
int num_gw;
int ret_val;
boolean_t is_v4mapped;
/*
* Type of addresses we'll try to connect to (ALL_ADDRS, ONLY_V6,
* ONLY_V4).
*/
int addr_type;
/* clear the socket address prior to use */
(void) memset(&sin6, '\0', sizeof (sin6));
sin6.sin6_family = AF_INET6;
(void) memset(&sin, '\0', sizeof (sin));
sin.sin_family = AF_INET;
if (connected) {
(void) printf("?Already connected to %s\n", hostname);
return (0);
}
#ifdef ICMD
itelnet_host = getenv("INTERNET_HOST");
if (itelnet_host == NULL || itelnet_host[0] == '\0') {
(void) printf("INTERNET_HOST environment variable undefined\n");
goto tn_exit;
}
#endif
if (argc < 2) {
(void) printf("(to) ");
if (GetAndAppendString(&line, &linesize, "open ",
stdin) == NULL) {
if (!feof(stdin)) {
perror("telnet");
goto tn_exit;
}
}
makeargv();
argc = margc;
argv = margv;
}
cmd = *argv;
--argc; ++argv;
while (argc) {
if (isprefix(*argv, "help") == 4 || isprefix(*argv, "?") == 1)
goto usage;
if (strcmp(*argv, "-l") == 0) {
--argc; ++argv;
if (argc == 0)
goto usage;
user = *argv++;
--argc;
continue;
}
if (strcmp(*argv, "-a") == 0) {
--argc; ++argv;
autologin = autologin_set = 1;
continue;
}
if (hostp == 0) {
hostp = *argv++;
--argc;
continue;
}
if (portp == 0) {
portp = *argv++;
--argc;
/*
* Do we treat this like a telnet port or raw?
*/
if (*portp == '-') {
portp++;
telnetport = 1;
} else
telnetport = 0;
continue;
}
usage:
(void) printf(
"usage: %s [-l user] [-a] host-name [port]\n", cmd);
goto tn_exit;
}
if (hostp == 0)
goto usage;
#ifdef ICMD
/*
* For setup phase treat the relay host as the target host.
*/
real_host = hostp;
hostp = itelnet_host;
#endif
num_gw = parse_input(hostp, hostname_list, &src_rtng_type);
if (num_gw < 0) {
goto tn_exit;
}
/* Last host in the hostname_list is the target */
hostp = hostname_list[num_gw];
host = resolve_hosts(hostname_list, num_gw, &gw_addrs, &addr_type,
portp);
if (host == NULL) {
goto tn_exit;
}
/*
* Check if number of gateways is less than max. available
*/
if ((addr_type == ALL_ADDRS || addr_type == ONLY_V6) &&
num_gw > MAX_GATEWAY6) {
(void) fprintf(stderr, "telnet: too many IPv6 gateways\n");
goto tn_exit;
}
if ((addr_type == ALL_ADDRS || addr_type == ONLY_V4) &&
num_gw > MAX_GATEWAY) {
(void) fprintf(stderr, "telnet: too many IPv4 gateways\n");
goto tn_exit;
}
/*
* If we pass a literal IPv4 address to getaddrinfo(), in the
* returned addrinfo structure, hostname is the IPv4-mapped IPv6
* address string. We prefer to preserve the literal IPv4 address
* string as the hostname. Also, if the hostname entered by the
* user is IPv4-mapped IPv6 address, we'll downgrade it to IPv4
* address.
*/
if (inet_addr(hostp) != (in_addr_t)-1) {
/* this is a literal IPv4 address */
(void) strlcpy(_hostname, hostp, sizeof (_hostname));
} else if ((inet_pton(AF_INET6, hostp, &addr6) > 0) &&
IN6_IS_ADDR_V4MAPPED(&addr6)) {
/* this is a IPv4-mapped IPv6 address */
IN6_V4MAPPED_TO_INADDR(&addr6, &addr);
(void) inet_ntop(AF_INET, &addr, _hostname, sizeof (_hostname));
} else {
(void) strlcpy(_hostname, host->ai_canonname,
sizeof (_hostname));
}
hostname = _hostname;
if (portp == NULL) {
telnetport = 1;
}
if (host->ai_family == AF_INET) {
target_port = ((struct sockaddr_in *)(host->ai_addr))->sin_port;
} else {
target_port = ((struct sockaddr_in6 *)(host->ai_addr))
->sin6_port;
}
#ifdef ICMD
/*
* Since we pass the port number as an ascii string to the proxy,
* we need it in host format.
*/
dest_port = ntohs(target_port);
sp = getservbyname("telnet-passthru", "tcp");
if (sp == 0) {
(void) fprintf(stderr,
"telnet: tcp/telnet-passthru: unknown service\n");
goto tn_exit;
}
target_port = sp->s_port;
#endif
h = host;
/*
* For IPv6 source routing, we need to initialize option buffer only
* once.
*/
if (num_gw > 0 && (addr_type == ALL_ADDRS || addr_type == ONLY_V6)) {
if (!prepare_optbuf6(gw_addrs, num_gw, &opt_buf6,
&opt_buf_len6)) {
goto tn_exit;
}
}
/*
* We procure the Kerberos config files options only
* if the user has choosen Krb5 authentication.
*/
if (krb5auth_flag > 0) {
krb5_profile_get_options(hostname, telnet_krb5_realm,
config_file_options);
}
if (encrypt_flag) {
extern boolean_t auth_enable_encrypt;
if (krb5_privacy_allowed()) {
encrypt_auto(1);
decrypt_auto(1);
wantencryption = B_TRUE;
autologin = 1;
auth_enable_encrypt = B_TRUE;
} else {
(void) fprintf(stderr, gettext(
"%s:Encryption not supported.\n"), prompt);
exit(1);
}
}
if (forward_flag && forwardable_flag) {
(void) fprintf(stderr, gettext(
"Error in krb5 configuration file. "
"Both forward and forwardable are set.\n"));
exit(1);
}
if (forwardable_flag) {
forward_flags |= OPTS_FORWARD_CREDS | OPTS_FORWARDABLE_CREDS;
} else if (forward_flag)
forward_flags |= OPTS_FORWARD_CREDS;
do {
/*
* Search for an address of desired type in the IP address list
* of the target.
*/
while (h != NULL) {
struct sockaddr_in6 *addr;
addr = (struct sockaddr_in6 *)h->ai_addr;
if (h->ai_family == AF_INET6)
is_v4mapped =
IN6_IS_ADDR_V4MAPPED(&addr->sin6_addr);
else
is_v4mapped = B_FALSE;
if (addr_type == ALL_ADDRS ||
(addr_type == ONLY_V6 &&
h->ai_family == AF_INET6) ||
(addr_type == ONLY_V4 &&
(h->ai_family == AF_INET || is_v4mapped)))
break;
/* skip undesired typed addresses */
h = h->ai_next;
}
if (h == NULL) {
fprintf(stderr,
"telnet: Unable to connect to remote host");
goto tn_exit;
}
/*
* We need to open a socket with a family matching the type of
* address we are trying to connect to. This is because we
* deal with IPv4 options and IPv6 extension headers.
*/
if (h->ai_family == AF_INET) {
addrp = &((struct sockaddr_in *)(h->ai_addr))->sin_addr;
((struct sockaddr_in *)(h->ai_addr))->sin_port =
target_port;
} else {
addrp = &((struct sockaddr_in6 *)(h->ai_addr))
->sin6_addr;
((struct sockaddr_in6 *)(h->ai_addr))->sin6_port =
target_port;
}
(void) printf("Trying %s...\n", inet_ntop(h->ai_family,
addrp, abuf, sizeof (abuf)));
net = socket(h->ai_family, SOCK_STREAM, 0);
if (net < 0) {
perror("telnet: socket");
goto tn_exit;
}
#ifndef ICMD
if (num_gw > 0) {
if (h->ai_family == AF_INET || is_v4mapped) {
if (!prepare_optbuf(gw_addrs, num_gw, &opt_buf,
&opt_buf_len, addrp, src_rtng_type)) {
goto tn_exit;
}
if (setsockopt(net, IPPROTO_IP, IP_OPTIONS,
opt_buf, opt_buf_len) < 0)
perror("setsockopt (IP_OPTIONS)");
} else {
if (setsockopt(net, IPPROTO_IPV6, IPV6_RTHDR,
opt_buf6, opt_buf_len6) < 0)
perror("setsockopt (IPV6_RTHDR)");
}
}
#endif
#if defined(USE_TOS)
if (is_v4mapped) {
if (tos < 0)
tos = 020; /* Low Delay bit */
if (tos &&
(setsockopt(net, IPPROTO_IP, IP_TOS,
&tos, sizeof (int)) < 0) &&
(errno != ENOPROTOOPT))
perror("telnet: setsockopt (IP_TOS) (ignored)");
}
#endif /* defined(USE_TOS) */
if (debug && SetSockOpt(net, SOL_SOCKET, SO_DEBUG, 1) < 0) {
perror("setsockopt (SO_DEBUG)");
}
ret_val = connect(net, h->ai_addr, h->ai_addrlen);
/*
* If failed, try the next address of the target.
*/
if (ret_val < 0) {
Close(&net);
if (h->ai_next != NULL) {
int oerrno = errno;
(void) fprintf(stderr,
"telnet: connect to address %s: ", abuf);
errno = oerrno;
perror((char *)0);
h = h->ai_next;
continue;
}
perror("telnet: Unable to connect to remote host");
goto tn_exit;
}
connected++;
} while (connected == 0);
freeaddrinfo(host);
host = NULL;
#ifdef ICMD
/*
* Do initial protocol to connect to farther end...
*/
{
char buf[1024];
(void) sprintf(buf, "%s %d\n", real_host, (int)dest_port);
write(net, buf, strlen(buf));
}
#endif
if (cmdrc(hostp, hostname) != 0)
goto tn_exit;
FreeHostnameList(hostname_list);
if (autologin && user == NULL) {
struct passwd *pw;
user = getenv("LOGNAME");
if (user == NULL ||
((pw = getpwnam(user)) != NULL) &&
pw->pw_uid != getuid()) {
if (pw = getpwuid(getuid()))
user = pw->pw_name;
else
user = NULL;
}
}
if (user) {
if (env_define((unsigned char *)"USER", (unsigned char *)user))
env_export((unsigned char *)"USER");
else {
/* Clean up and exit. */
Close(&net);
(void) snprintf(buf, sizeof (buf),
"Connection to %.*s closed.\n",
MAXHOSTNAMELEN, hostname);
ExitString(buf, EXIT_FAILURE);
/* NOTREACHED */
}
}
(void) call(3, status, "status", "notmuch");
if (setjmp(peerdied) == 0)
telnet(user);
Close(&net);
(void) snprintf(buf, sizeof (buf),
"Connection to %.*s closed by foreign host.\n",
MAXHOSTNAMELEN, hostname);
ExitString(buf, EXIT_FAILURE);
/*NOTREACHED*/
tn_exit:
FreeHostnameList(hostname_list);
Close(&net);
connected = 0;
if (host != NULL)
freeaddrinfo(host);
return (0);
}
#define HELPINDENT (sizeof ("connect"))
static char openhelp[] = "connect to a site";
static char closehelp[] = "close current connection";
static char logouthelp[] =
"forcibly logout remote user and close the connection";
static char quithelp[] = "exit telnet";
static char statushelp[] = "print status information";
static char helphelp[] = "print help information";
static char sendhelp[] =
"transmit special characters ('send ?' for more)";
static char sethelp[] = "set operating parameters ('set ?' for more)";
static char unsethelp[] = "unset operating parameters ('unset ?' for more)";
static char togglestring[] =
"toggle operating parameters ('toggle ?' for more)";
static char slchelp[] = "change state of special charaters ('slc ?' for more)";
static char displayhelp[] = "display operating parameters";
static char authhelp[] =
"turn on (off) authentication ('auth ?' for more)";
static char forwardhelp[] =
"turn on (off) credential forwarding ('forward ?' for more)";
static char encrypthelp[] =
"turn on (off) encryption ('encrypt ?' for more)";
static char zhelp[] = "suspend telnet";
static char shellhelp[] = "invoke a subshell";
static char envhelp[] = "change environment variables ('environ ?' for more)";
static char modestring[] =
"try to enter line or character mode ('mode ?' for more)";
static int help();
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, quit, 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 },
{ "auth", authhelp, auth_cmd, 0 },
{ "encrypt", encrypthelp, encrypt_cmd, 0 },
{ "forward", forwardhelp, forw_cmd, 0 },
{ "z", zhelp, suspend, 0 },
{ "!", shellhelp, shell, 0 },
{ "environ", envhelp, env_cmd, 0 },
{ "?", helphelp, help, 0 },
0
};
static Command cmdtab2[] = {
{ "help", 0, help, 0 },
{ "escape", 0, setescape, 0 },
{ "crmod", 0, togcrmod, 0 },
0
};
/*
* Call routine with argc, argv set from args.
* Uses /usr/include/stdarg.h
*/
#define MAXVARGS 100
/*VARARGS1*/
static void
call(int n_ptrs, ...)
{
va_list ap;
typedef int (*intrtn_t)();
intrtn_t routine;
char *args[MAXVARGS+1]; /* leave 1 for trailing NULL */
int argno = 0;
if (n_ptrs > MAXVARGS)
n_ptrs = MAXVARGS;
va_start(ap, n_ptrs);
routine = (va_arg(ap, intrtn_t)); /* extract the routine's name */
n_ptrs--;
while (argno < n_ptrs) /* extract the routine's args */
args[argno++] = va_arg(ap, char *);
args[argno] = NULL; /* NULL terminate for good luck */
va_end(ap);
(*routine)(argno, args);
}
static Command *
getcmd(name)
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(top, tbuf, cnt)
int top;
char *tbuf;
int cnt;
{
Command *c;
setcommandmode();
if (!top) {
(void) putchar('\n');
} else {
(void) signal(SIGINT, SIG_DFL);
(void) signal(SIGQUIT, SIG_DFL);
}
for (;;) {
if (rlogin == _POSIX_VDISABLE)
(void) printf("%s> ", prompt);
if (tbuf) {
char *cp;
if (AllocStringBuffer(&line, &linesize, cnt) == NULL)
goto command_exit;
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)
(void) printf("%s\n", line);
} else {
getline:
if (rlogin != _POSIX_VDISABLE)
(void) printf("%s> ", prompt);
if (GetString(&line, &linesize, stdin) == NULL) {
if (!feof(stdin))
perror("telnet");
(void) quit();
/*NOTREACHED*/
break;
}
}
if (line[0] == 0)
break;
makeargv();
if (margv[0] == 0) {
break;
}
c = getcmd(margv[0]);
if (Ambiguous(c)) {
(void) printf("?Ambiguous command\n");
continue;
}
if (c == 0) {
(void) printf("?Invalid command\n");
continue;
}
if (c->needconnect && !connected) {
(void) printf("?Need to be connected first.\n");
continue;
}
if ((*c->handler)(margc, margv)) {
break;
}
}
command_exit:
if (!top) {
if (!connected) {
longjmp(toplevel, 1);
/*NOTREACHED*/
}
setconnmode(0);
}
}
/*
* Help command.
*/
static int
help(argc, argv)
int argc;
char *argv[];
{
register Command *c;
if (argc == 1) {
(void) printf(
"Commands may be abbreviated. Commands are:\n\n");
for (c = cmdtab; c->name; c++)
if (c->help) {
(void) printf("%-*s\t%s\n", HELPINDENT,
c->name, c->help);
}
(void) printf("<return>\tleave command mode\n");
return (0);
}
while (--argc > 0) {
register char *arg;
arg = *++argv;
c = getcmd(arg);
if (Ambiguous(c))
(void) printf("?Ambiguous help command %s\n", arg);
else if (c == (Command *)0)
(void) printf("?Invalid help command %s\n", arg);
else if (c->help) {
(void) printf("%s\n", c->help);
} else {
(void) printf("No additional help on %s\n", arg);
}
}
return (0);
}
static char *rcname = NULL;
#define TELNETRC_NAME "telnetrc"
#define TELNETRC_COMP "/." TELNETRC_NAME
static int
cmdrc(char *m1, char *m2)
{
Command *c;
FILE *rcfile = NULL;
int gotmachine = 0;
int l1 = strlen(m1);
int l2 = strlen(m2);
char m1save[MAXHOSTNAMELEN];
int ret = 0;
char def[] = "DEFAULT";
if (skiprc)
goto cmdrc_exit;
doing_rc = 1;
(void) strlcpy(m1save, m1, sizeof (m1save));
m1 = m1save;
if (rcname == NULL) {
char *homedir;
unsigned rcbuflen;
if ((homedir = getenv("HOME")) == NULL)
homedir = "";
rcbuflen = strlen(homedir) + strlen(TELNETRC_COMP) + 1;
if ((rcname = malloc(rcbuflen)) == NULL) {
perror("telnet: can't process " TELNETRC_NAME);
ret = 1;
goto cmdrc_exit;
}
(void) strcpy(rcname, homedir);
(void) strcat(rcname, TELNETRC_COMP);
}
if ((rcfile = fopen(rcname, "r")) == NULL)
goto cmdrc_exit;
for (;;) {
if (GetString(&line, &linesize, rcfile) == NULL) {
if (!feof(rcfile)) {
perror("telnet: error reading " TELNETRC_NAME);
ret = 1;
goto cmdrc_exit;
}
break;
}
if (line[0] == 0)
continue;
if (line[0] == '#')
continue;
if (gotmachine) {
if (!isspace(line[0]))
gotmachine = 0;
}
if (gotmachine == 0) {
if (isspace(line[0]))
continue;
if (strncasecmp(line, m1, l1) == 0)
(void) strcpy(line, &line[l1]);
else if (strncasecmp(line, m2, l2) == 0)
(void) strcpy(line, &line[l2]);
else if (strncasecmp(line, def, sizeof (def) - 1) == 0)
(void) strcpy(line, &line[sizeof (def) - 1]);
else
continue;
if (line[0] != ' ' && line[0] != '\t' &&
line[0] != '\n')
continue;
gotmachine = 1;
}
makeargv();
if (margv[0] == 0)
continue;
c = getcmd(margv[0]);
if (Ambiguous(c)) {
(void) printf("?Ambiguous command: %s\n", margv[0]);
continue;
}
if (c == 0) {
(void) printf("?Invalid command: %s\n", margv[0]);
continue;
}
/*
* This should never happen...
*/
if (c->needconnect && !connected) {
(void) printf("?Need to be connected first for %s.\n",
margv[0]);
continue;
}
(*c->handler)(margc, margv);
}
cmdrc_exit:
if (rcfile != NULL)
(void) fclose(rcfile);
doing_rc = 0;
return (ret);
}