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24a5c1e093
telnetd/telnet/externs.h
jilles 0fddcbcf1c telnet: Fix infinite loop if local output generates SIGPIPE. 
Instead of catching SIGPIPE and jumping out of the signal handler with
longjmp, ignore it and handle write errors to the local output by exiting
from there. I have changed the error message to mention the local output
instead of NetBSD's wrong "Connection closed by foreign host". Write errors
to the network were already handled by exiting immediately and this now
applies to EPIPE too.

The code assumed that SIGPIPE could only be generated by the network
connection; if it was generated by the local output, it would longjmp out of
the signal handler and write an error message which caused another SIGPIPE.

PR:		19773
Obtained from:	NetBSD
MFC after:	1 week


git-svn-id: http://svn0.us-east.freebsd.org/base/head/contrib/telnet@207449 ccf9f872-aa2e-dd11-9fc8-001c23d0bc1f
2010-04-30 19:52:35 +00:00

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/*
* 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.
*
* @(#)externs.h 8.3 (Berkeley) 5/30/95
* $FreeBSD$
*/
#ifndef BSD
# define BSD 43
#endif
/*
* ucb stdio.h defines BSD as something weird
*/
#if defined(sun) && defined(__svr4__)
#define BSD 43
#endif
#ifndef USE_TERMIO
# if BSD > 43 || defined(SYSV_TERMIO)
# define USE_TERMIO
# endif
#endif
#include <stdio.h>
#include <setjmp.h>
#include <sys/ioctl.h>
#include <errno.h>
#ifdef USE_TERMIO
# ifndef VINTR
# include <termios.h>
# endif
# define termio termios
#endif
#if defined(NO_CC_T) || !defined(USE_TERMIO)
# if !defined(USE_TERMIO)
typedef char cc_t;
# else
typedef unsigned char cc_t;
# endif
#endif
#include <string.h>
#if defined(IPSEC)
#include <netipsec/ipsec.h>
#if defined(IPSEC_POLICY_IPSEC)
extern char *ipsec_policy_in;
extern char *ipsec_policy_out;
#endif
#endif
#ifndef _POSIX_VDISABLE
# ifdef sun
# include <sys/param.h> /* pick up VDISABLE definition, mayby */
# endif
# ifdef VDISABLE
# define _POSIX_VDISABLE VDISABLE
# else
# define _POSIX_VDISABLE ((cc_t)'\377')
# endif
#endif
#define SUBBUFSIZE 256
#if !defined(P)
# ifdef __STDC__
# define P(x) x
# else
# define P(x) ()
# endif
#endif
extern int
autologin, /* Autologin enabled */
skiprc, /* Don't process the ~/.telnetrc file */
eight, /* use eight bit mode (binary in and/or out */
family, /* address family of peer */
flushout, /* flush output */
connected, /* Are we connected to the other side? */
globalmode, /* Mode tty should be in */
telnetport, /* Are we connected to the telnet port? */
localflow, /* Flow control handled locally */
restartany, /* If flow control, restart output on any character */
localchars, /* we recognize interrupt/quit */
donelclchars, /* the user has set "localchars" */
showoptions,
net, /* Network file descriptor */
tin, /* Terminal input file descriptor */
tout, /* Terminal output file descriptor */
crlf, /* Should '\r' be mapped to <CR><LF> (or <CR><NUL>)? */
autoflush, /* flush output when interrupting? */
autosynch, /* send interrupt characters with SYNCH? */
SYNCHing, /* Is the stream in telnet SYNCH mode? */
donebinarytoggle, /* the user has put us in binary */
dontlecho, /* do we suppress local echoing right now? */
crmod,
netdata, /* Print out network data flow */
prettydump, /* Print "netdata" output in user readable format */
termdata, /* Print out terminal data flow */
telnet_debug, /* Debug level */
doaddrlookup, /* do a reverse lookup? */
clienteof; /* Client received EOF */
extern cc_t escape; /* Escape to command mode */
extern cc_t rlogin; /* Rlogin mode escape character */
#ifdef KLUDGELINEMODE
extern cc_t echoc; /* Toggle local echoing */
#endif
extern char
*prompt; /* Prompt for command. */
extern char
doopt[],
dont[],
will[],
wont[],
options[], /* All the little options */
*hostname; /* Who are we connected to? */
#ifdef ENCRYPTION
extern void (*encrypt_output)(unsigned char *, int);
extern int (*decrypt_input)(int);
#endif /* ENCRYPTION */
/*
* We keep track of each side of the option negotiation.
*/
#define MY_STATE_WILL 0x01
#define MY_WANT_STATE_WILL 0x02
#define MY_STATE_DO 0x04
#define MY_WANT_STATE_DO 0x08
/*
* Macros to check the current state of things
*/
#define my_state_is_do(opt) (options[opt]&MY_STATE_DO)
#define my_state_is_will(opt) (options[opt]&MY_STATE_WILL)
#define my_want_state_is_do(opt) (options[opt]&MY_WANT_STATE_DO)
#define my_want_state_is_will(opt) (options[opt]&MY_WANT_STATE_WILL)
#define my_state_is_dont(opt) (!my_state_is_do(opt))
#define my_state_is_wont(opt) (!my_state_is_will(opt))
#define my_want_state_is_dont(opt) (!my_want_state_is_do(opt))
#define my_want_state_is_wont(opt) (!my_want_state_is_will(opt))
#define set_my_state_do(opt) {options[opt] |= MY_STATE_DO;}
#define set_my_state_will(opt) {options[opt] |= MY_STATE_WILL;}
#define set_my_want_state_do(opt) {options[opt] |= MY_WANT_STATE_DO;}
#define set_my_want_state_will(opt) {options[opt] |= MY_WANT_STATE_WILL;}
#define set_my_state_dont(opt) {options[opt] &= ~MY_STATE_DO;}
#define set_my_state_wont(opt) {options[opt] &= ~MY_STATE_WILL;}
#define set_my_want_state_dont(opt) {options[opt] &= ~MY_WANT_STATE_DO;}
#define set_my_want_state_wont(opt) {options[opt] &= ~MY_WANT_STATE_WILL;}
/*
* Make everything symetrical
*/
#define HIS_STATE_WILL MY_STATE_DO
#define HIS_WANT_STATE_WILL MY_WANT_STATE_DO
#define HIS_STATE_DO MY_STATE_WILL
#define HIS_WANT_STATE_DO MY_WANT_STATE_WILL
#define his_state_is_do my_state_is_will
#define his_state_is_will my_state_is_do
#define his_want_state_is_do my_want_state_is_will
#define his_want_state_is_will my_want_state_is_do
#define his_state_is_dont my_state_is_wont
#define his_state_is_wont my_state_is_dont
#define his_want_state_is_dont my_want_state_is_wont
#define his_want_state_is_wont my_want_state_is_dont
#define set_his_state_do set_my_state_will
#define set_his_state_will set_my_state_do
#define set_his_want_state_do set_my_want_state_will
#define set_his_want_state_will set_my_want_state_do
#define set_his_state_dont set_my_state_wont
#define set_his_state_wont set_my_state_dont
#define set_his_want_state_dont set_my_want_state_wont
#define set_his_want_state_wont set_my_want_state_dont
#if defined(USE_TERMIO)
#define SIG_FUNC_RET void
#else
#define SIG_FUNC_RET int
#endif
#ifdef SIGINFO
extern SIG_FUNC_RET
ayt_status(void);
#endif
extern FILE
*NetTrace; /* Where debugging output goes */
extern unsigned char
NetTraceFile[]; /* Name of file where debugging output goes */
extern void
SetNetTrace(char *); /* Function to change where debugging goes */
extern jmp_buf
toplevel; /* For error conditions. */
extern void
command(int, const char *, int),
Dump(char, unsigned char *, int),
env_init(void),
Exit(int),
ExitString(const char *, int),
init_network(void),
init_sys(void),
init_telnet(void),
init_terminal(void),
intp(void),
optionstatus(void),
printoption(const char *, int, int),
printsub(char, unsigned char *, int),
quit(void),
sendabort(void),
sendbrk(void),
sendeof(void),
sendsusp(void),
sendnaws(void),
sendayt(void),
setconnmode(int),
setcommandmode(void),
set_escape_char(char *s),
setneturg(void),
sys_telnet_init(void),
telnet(char *),
tel_enter_binary(int),
tel_leave_binary(int),
TerminalFlushOutput(void),
TerminalNewMode(int),
TerminalRestoreState(void),
TerminalSaveState(void),
TerminalDefaultChars(void),
TerminalSpeeds(long *, long *),
tninit(void),
upcase(char *),
willoption(int),
wontoption(int);
extern void
send_do(int, int),
send_dont(int, int),
send_will(int, int),
send_wont(int, int);
extern void
lm_will(unsigned char *, int),
lm_wont(unsigned char *, int),
lm_do(unsigned char *, int),
lm_dont(unsigned char *, int),
lm_mode(unsigned char *, int, int);
extern void
slc_init(void),
slcstate(void),
slc_mode_export(void),
slc_mode_import(int),
slc_import(int),
slc_export(void),
slc(unsigned char *, int),
slc_check(void),
slc_start_reply(void),
slc_add_reply(unsigned char, unsigned char, cc_t),
slc_end_reply(void);
extern int
getconnmode(void),
opt_welldefined(const char *),
NetClose(int),
netflush(void),
process_rings(int, int, int, int, int, int),
rlogin_susp(void),
SetSockOpt(int, int, int, int),
slc_update(void),
stilloob(void),
telrcv(void),
TerminalRead(char *, int),
TerminalWrite(char *, int),
TerminalAutoFlush(void),
TerminalWindowSize(long *, long *),
TerminalSpecialChars(int),
tn(int, char **),
ttyflush(int);
extern void
env_opt(unsigned char *, int),
env_opt_start(void),
env_opt_start_info(void),
env_opt_add(unsigned char *),
env_opt_end(int);
extern unsigned char
*env_default(int, int),
*env_getvalue(const unsigned char *);
extern int
get_status(char *),
dosynch(char *);
extern cc_t
*tcval(int);
#ifndef USE_TERMIO
extern struct tchars ntc;
extern struct ltchars nltc;
extern struct sgttyb nttyb;
# define termEofChar ntc.t_eofc
# define termEraseChar nttyb.sg_erase
# define termFlushChar nltc.t_flushc
# define termIntChar ntc.t_intrc
# define termKillChar nttyb.sg_kill
# define termLiteralNextChar nltc.t_lnextc
# define termQuitChar ntc.t_quitc
# define termSuspChar nltc.t_suspc
# define termRprntChar nltc.t_rprntc
# define termWerasChar nltc.t_werasc
# define termStartChar ntc.t_startc
# define termStopChar ntc.t_stopc
# define termForw1Char ntc.t_brkc
extern cc_t termForw2Char;
extern cc_t termAytChar;
# define termEofCharp (cc_t *)&ntc.t_eofc
# define termEraseCharp (cc_t *)&nttyb.sg_erase
# define termFlushCharp (cc_t *)&nltc.t_flushc
# define termIntCharp (cc_t *)&ntc.t_intrc
# define termKillCharp (cc_t *)&nttyb.sg_kill
# define termLiteralNextCharp (cc_t *)&nltc.t_lnextc
# define termQuitCharp (cc_t *)&ntc.t_quitc
# define termSuspCharp (cc_t *)&nltc.t_suspc
# define termRprntCharp (cc_t *)&nltc.t_rprntc
# define termWerasCharp (cc_t *)&nltc.t_werasc
# define termStartCharp (cc_t *)&ntc.t_startc
# define termStopCharp (cc_t *)&ntc.t_stopc
# define termForw1Charp (cc_t *)&ntc.t_brkc
# define termForw2Charp (cc_t *)&termForw2Char
# define termAytCharp (cc_t *)&termAytChar
# else
extern struct termio new_tc;
# define termEofChar new_tc.c_cc[VEOF]
# define termEraseChar new_tc.c_cc[VERASE]
# define termIntChar new_tc.c_cc[VINTR]
# define termKillChar new_tc.c_cc[VKILL]
# define termQuitChar new_tc.c_cc[VQUIT]
# ifndef VSUSP
extern cc_t termSuspChar;
# else
# define termSuspChar new_tc.c_cc[VSUSP]
# endif
# if defined(VFLUSHO) && !defined(VDISCARD)
# define VDISCARD VFLUSHO
# endif
# ifndef VDISCARD
extern cc_t termFlushChar;
# else
# define termFlushChar new_tc.c_cc[VDISCARD]
# endif
# ifndef VWERASE
extern cc_t termWerasChar;
# else
# define termWerasChar new_tc.c_cc[VWERASE]
# endif
# ifndef VREPRINT
extern cc_t termRprntChar;
# else
# define termRprntChar new_tc.c_cc[VREPRINT]
# endif
# ifndef VLNEXT
extern cc_t termLiteralNextChar;
# else
# define termLiteralNextChar new_tc.c_cc[VLNEXT]
# endif
# ifndef VSTART
extern cc_t termStartChar;
# else
# define termStartChar new_tc.c_cc[VSTART]
# endif
# ifndef VSTOP
extern cc_t termStopChar;
# else
# define termStopChar new_tc.c_cc[VSTOP]
# endif
# ifndef VEOL
extern cc_t termForw1Char;
# else
# define termForw1Char new_tc.c_cc[VEOL]
# endif
# ifndef VEOL2
extern cc_t termForw2Char;
# else
# define termForw2Char new_tc.c_cc[VEOL]
# endif
# ifndef VSTATUS
extern cc_t termAytChar;
#else
# define termAytChar new_tc.c_cc[VSTATUS]
#endif
# if defined(__STDC__)
# define termEofCharp &termEofChar
# define termEraseCharp &termEraseChar
# define termIntCharp &termIntChar
# define termKillCharp &termKillChar
# define termQuitCharp &termQuitChar
# define termSuspCharp &termSuspChar
# define termFlushCharp &termFlushChar
# define termWerasCharp &termWerasChar
# define termRprntCharp &termRprntChar
# define termLiteralNextCharp &termLiteralNextChar
# define termStartCharp &termStartChar
# define termStopCharp &termStopChar
# define termForw1Charp &termForw1Char
# define termForw2Charp &termForw2Char
# define termAytCharp &termAytChar
# else
/* Work around a compiler bug */
# define termEofCharp 0
# define termEraseCharp 0
# define termIntCharp 0
# define termKillCharp 0
# define termQuitCharp 0
# define termSuspCharp 0
# define termFlushCharp 0
# define termWerasCharp 0
# define termRprntCharp 0
# define termLiteralNextCharp 0
# define termStartCharp 0
# define termStopCharp 0
# define termForw1Charp 0
# define termForw2Charp 0
# define termAytCharp 0
# endif
#endif
/* Ring buffer structures which are shared */
extern Ring
netoring,
netiring,
ttyoring,
ttyiring;
extern void
xmitAO(void),
xmitEC(void),
xmitEL(void);
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