1034 lines
22 KiB
C
1034 lines
22 KiB
C
/* $NetBSD: rlogin.c,v 1.30 2004/03/31 13:01:00 jmmv Exp $ */
|
|
|
|
/*
|
|
* Copyright (c) 1983, 1990, 1993
|
|
* The Regents of the University of California. All rights reserved.
|
|
*
|
|
* Redistribution and use in source and binary forms, with or without
|
|
* modification, are permitted provided that the following conditions
|
|
* are met:
|
|
* 1. Redistributions of source code must retain the above copyright
|
|
* notice, this list of conditions and the following disclaimer.
|
|
* 2. Redistributions in binary form must reproduce the above copyright
|
|
* notice, this list of conditions and the following disclaimer in the
|
|
* documentation and/or other materials provided with the distribution.
|
|
* 3. Neither the name of the University nor the names of its contributors
|
|
* may be used to endorse or promote products derived from this software
|
|
* without specific prior written permission.
|
|
*
|
|
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
|
|
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
|
|
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
|
|
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
|
|
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
|
|
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
|
|
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
|
|
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
|
|
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
|
|
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
|
|
* SUCH DAMAGE.
|
|
*/
|
|
|
|
#include <sys/cdefs.h>
|
|
#ifndef lint
|
|
__COPYRIGHT("@(#) Copyright (c) 1983, 1990, 1993\n\
|
|
The Regents of the University of California. All rights reserved.\n");
|
|
#endif /* not lint */
|
|
|
|
#ifndef lint
|
|
#if 0
|
|
static char sccsid[] = "@(#)rlogin.c 8.4 (Berkeley) 4/29/95";
|
|
#else
|
|
__RCSID("$NetBSD: rlogin.c,v 1.30 2004/03/31 13:01:00 jmmv Exp $");
|
|
#endif
|
|
#endif /* not lint */
|
|
|
|
/*
|
|
* rlogin - remote login
|
|
*/
|
|
#include <sys/param.h>
|
|
#include <sys/ioctl.h>
|
|
#include <sys/socket.h>
|
|
#include <sys/time.h>
|
|
#include <sys/resource.h>
|
|
#include <sys/wait.h>
|
|
#include <sys/ioctl.h>
|
|
|
|
#include <netinet/in.h>
|
|
#include <netinet/in_systm.h>
|
|
#include <netinet/ip.h>
|
|
|
|
#include <err.h>
|
|
#include <errno.h>
|
|
#include <fcntl.h>
|
|
#include <netdb.h>
|
|
#include <pwd.h>
|
|
#include <setjmp.h>
|
|
#include <signal.h>
|
|
#include <stdarg.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <termios.h>
|
|
#include <unistd.h>
|
|
|
|
#ifdef KERBEROS
|
|
#include <kerberosIV/des.h>
|
|
#include <kerberosIV/krb.h>
|
|
#include <kerberosIV/kstream.h>
|
|
|
|
#include "krb.h"
|
|
|
|
CREDENTIALS cred;
|
|
Key_schedule schedule;
|
|
MSG_DAT msg_data;
|
|
struct sockaddr_in local, foreign;
|
|
int use_kerberos = 1, doencrypt;
|
|
kstream krem;
|
|
#endif
|
|
|
|
#ifndef TIOCPKT_WINDOW
|
|
#define TIOCPKT_WINDOW 0x80
|
|
#endif
|
|
|
|
/* concession to Sun */
|
|
#ifndef SIGUSR1
|
|
#define SIGUSR1 30
|
|
#endif
|
|
|
|
#ifndef CCEQ
|
|
#define CCEQ(val, c) (c == val ? val != _POSIX_VDISABLE : 0)
|
|
#endif
|
|
|
|
int eight, rem;
|
|
struct termios deftty;
|
|
|
|
int noescape;
|
|
u_char escapechar = '~';
|
|
|
|
#ifdef OLDSUN
|
|
struct winsize {
|
|
unsigned short ws_row, ws_col;
|
|
unsigned short ws_xpixel, ws_ypixel;
|
|
};
|
|
#else
|
|
#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
|
|
#endif
|
|
struct winsize winsize;
|
|
|
|
void catch_child(int);
|
|
void copytochild(int);
|
|
void doit(sigset_t *);
|
|
void done(int);
|
|
void echo(int);
|
|
u_int getescape(char *);
|
|
void lostpeer(int);
|
|
int main(int, char **);
|
|
void mode(int);
|
|
void msg(char *);
|
|
void oob(int);
|
|
int reader(sigset_t *);
|
|
void sendwindow(void);
|
|
void setsignal(int);
|
|
int speed(int);
|
|
void sigwinch(int);
|
|
void stop(int);
|
|
void usage(void);
|
|
void writer(void);
|
|
void writeroob(int);
|
|
|
|
#ifdef KERBEROS
|
|
void warning(const char *, ...);
|
|
#endif
|
|
#ifdef OLDSUN
|
|
int get_window_size(int, struct winsize *);
|
|
#endif
|
|
|
|
int
|
|
main(int argc, char *argv[])
|
|
{
|
|
struct passwd *pw;
|
|
struct servent *sp;
|
|
struct termios tty;
|
|
sigset_t smask;
|
|
int argoff, ch, dflag, one, uid;
|
|
int i, len, len2;
|
|
char *host, *p, *user, *name, term[1024] = "network";
|
|
speed_t ospeed;
|
|
struct sigaction sa;
|
|
char *service=NULL;
|
|
struct rlimit rlim;
|
|
#ifdef KERBEROS
|
|
KTEXT_ST ticket;
|
|
int sock;
|
|
long authopts;
|
|
int through_once = 0;
|
|
extern int _kstream_des_debug_OOB;
|
|
char *dest_realm = NULL;
|
|
#endif
|
|
|
|
argoff = dflag = 0;
|
|
one = 1;
|
|
host = user = NULL;
|
|
sp = NULL;
|
|
|
|
if (strcmp(getprogname(), "rlogin") != 0) {
|
|
host = strdup(getprogname());
|
|
if (host == NULL)
|
|
err(1, NULL);
|
|
}
|
|
|
|
/* handle "rlogin host flags" */
|
|
if (!host && argc > 2 && argv[1][0] != '-') {
|
|
host = argv[1];
|
|
argoff = 1;
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
#define OPTIONS "8EKLde:p:k:l:x"
|
|
#else
|
|
#define OPTIONS "8EKLde:p:l:"
|
|
#endif
|
|
while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
|
|
switch(ch) {
|
|
case '8':
|
|
eight = 1;
|
|
break;
|
|
case 'E':
|
|
noescape = 1;
|
|
break;
|
|
#ifdef KERBEROS
|
|
case 'K':
|
|
use_kerberos = 0;
|
|
break;
|
|
#endif
|
|
case 'd':
|
|
#ifdef KERBEROS
|
|
_kstream_des_debug_OOB = 1;
|
|
#endif
|
|
dflag = 1;
|
|
break;
|
|
case 'e':
|
|
noescape = 0;
|
|
escapechar = getescape(optarg);
|
|
break;
|
|
#ifdef KERBEROS
|
|
case 'k':
|
|
dest_realm = optarg;
|
|
break;
|
|
#endif
|
|
case 'l':
|
|
user = optarg;
|
|
break;
|
|
case 'p':
|
|
/*HF*/
|
|
service = optarg;
|
|
sp = getservbyname(service, "tcp");
|
|
if (sp == NULL) { /* number given, no name */
|
|
sp = malloc(sizeof(*sp));
|
|
memset(sp, 0, sizeof(*sp));
|
|
sp->s_name = service;
|
|
sp->s_port = atoi(service);
|
|
if (sp->s_port <= 0 || sp->s_port > IPPORT_ANONMAX)
|
|
errx(1,"port must be between 1 and %d", IPPORT_ANONMAX);
|
|
}
|
|
break;
|
|
#ifdef CRYPT
|
|
#ifdef KERBEROS
|
|
case 'x':
|
|
doencrypt = 1;
|
|
break;
|
|
#endif
|
|
#endif
|
|
case '?':
|
|
default:
|
|
usage();
|
|
}
|
|
optind += argoff;
|
|
argc -= optind;
|
|
argv += optind;
|
|
|
|
/* if haven't gotten a host yet, do so */
|
|
if (!host && !(host = *argv++))
|
|
usage();
|
|
|
|
if (*argv)
|
|
usage();
|
|
|
|
if (!(pw = getpwuid(uid = getuid())))
|
|
errx(1, "unknown user id.");
|
|
/* Accept user1@host format, though "-l user2" overrides user1 */
|
|
p = strchr(host, '@');
|
|
if (p) {
|
|
*p = '\0';
|
|
if (!user && p > host)
|
|
user = host;
|
|
host = p + 1;
|
|
if (*host == '\0')
|
|
usage();
|
|
}
|
|
if ((name = strdup(pw->pw_name)) == NULL)
|
|
err(1, "malloc");
|
|
if (!user)
|
|
user = name;
|
|
|
|
#ifdef KERBEROS
|
|
if (use_kerberos) {
|
|
if (sp == NULL) {
|
|
sp = getservbyname((doencrypt ? "eklogin" : "klogin"), "tcp");
|
|
}
|
|
if (sp == NULL) {
|
|
use_kerberos = 0;
|
|
warning("can't get entry for %s/tcp service",
|
|
doencrypt ? "eklogin" : "klogin");
|
|
}
|
|
}
|
|
#endif
|
|
if (sp == NULL)
|
|
sp = getservbyname("login", "tcp");
|
|
if (sp == NULL)
|
|
errx(1, "login/tcp: unknown service.");
|
|
|
|
if ((p = getenv("TERM")) != NULL)
|
|
(void)strlcpy(term, p, sizeof(term));
|
|
len = strlen(term);
|
|
if (len < (sizeof(term) - 1) && tcgetattr(0, &tty) == 0) {
|
|
/* start at 2 to include the / */
|
|
for (ospeed = i = cfgetospeed(&tty), len2 = 2; i > 9; len2++)
|
|
i /= 10;
|
|
|
|
if (len + len2 < sizeof(term))
|
|
(void)snprintf(term + len, len2 + 1, "/%d", ospeed);
|
|
}
|
|
|
|
(void)get_window_size(0, &winsize);
|
|
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = lostpeer;
|
|
(void)sigaction(SIGPIPE, &sa, (struct sigaction *)0);
|
|
/* will use SIGUSR1 for window size hack, so hold it off */
|
|
sigemptyset(&smask);
|
|
sigaddset(&smask, SIGURG);
|
|
sigaddset(&smask, SIGUSR1);
|
|
(void)sigprocmask(SIG_SETMASK, &smask, &smask);
|
|
/*
|
|
* We set SIGURG and SIGUSR1 below so that an
|
|
* incoming signal will be held pending rather than being
|
|
* discarded. Note that these routines will be ready to get
|
|
* a signal by the time that they are unblocked below.;
|
|
*/
|
|
sa.sa_handler = copytochild;
|
|
(void)sigaction(SIGURG, &sa, (struct sigaction *) 0);
|
|
sa.sa_handler = writeroob;
|
|
(void)sigaction(SIGUSR1, &sa, (struct sigaction *) 0);
|
|
|
|
/* don't dump core */
|
|
rlim.rlim_cur = rlim.rlim_max = 0;
|
|
if (setrlimit(RLIMIT_CORE, &rlim) < 0)
|
|
warn("setrlimit");
|
|
|
|
#ifdef KERBEROS
|
|
try_connect:
|
|
if (use_kerberos) {
|
|
struct hostent *hp;
|
|
|
|
/* Fully qualify hostname (needed for krb_realmofhost). */
|
|
hp = gethostbyname(host);
|
|
if (hp != NULL && !(host = strdup(hp->h_name)))
|
|
errx(1, "%s", strerror(ENOMEM));
|
|
|
|
rem = KSUCCESS;
|
|
errno = 0;
|
|
#ifdef CRYPT
|
|
if (doencrypt)
|
|
authopts = KOPT_DO_MUTUAL;
|
|
else
|
|
#endif /* CRYPT */
|
|
authopts = 0L;
|
|
|
|
if (dest_realm == NULL) {
|
|
/* default this now, once. */
|
|
if (!(dest_realm = krb_realmofhost (host))) {
|
|
warnx("Unknown realm for host %s.", host);
|
|
use_kerberos = 0;
|
|
if (service != NULL)
|
|
sp = getservbyname("login", "tcp");
|
|
goto try_connect;
|
|
}
|
|
}
|
|
|
|
rem = kcmd(&sock, &host, sp->s_port, name, user,
|
|
term, 0, &ticket, "rcmd", dest_realm,
|
|
&cred, schedule, &msg_data, &local, &foreign,
|
|
authopts);
|
|
|
|
if (rem != KSUCCESS) {
|
|
switch(rem) {
|
|
|
|
case KDC_PR_UNKNOWN:
|
|
warnx("Host %s not registered for %s",
|
|
host, "Kerberos rlogin service");
|
|
use_kerberos = 0;
|
|
if (service != NULL)
|
|
sp = getservbyname("login", "tcp");
|
|
goto try_connect;
|
|
case NO_TKT_FIL:
|
|
if (through_once++) {
|
|
use_kerberos = 0;
|
|
if (service != NULL)
|
|
sp = getservbyname("login", "tcp");
|
|
goto try_connect;
|
|
}
|
|
#ifdef notyet
|
|
krb_get_pw_in_tkt(user, krb_realm, "krbtgt",
|
|
krb_realm,
|
|
DEFAULT_TKT_LIFE/5, 0);
|
|
goto try_connect;
|
|
#endif
|
|
default:
|
|
warnx("Kerberos rcmd failed: %s",
|
|
(rem == -1) ? "rcmd protocol failure" :
|
|
krb_err_txt[rem]);
|
|
use_kerberos = 0;
|
|
if (service != NULL)
|
|
sp = getservbyname("login", "tcp");
|
|
goto try_connect;
|
|
}
|
|
}
|
|
rem = sock;
|
|
if (doencrypt)
|
|
krem = kstream_create_rlogin_from_fd(rem, &schedule,
|
|
&cred.session);
|
|
else
|
|
krem = kstream_create_from_fd(rem, 0, 0);
|
|
kstream_set_buffer_mode(krem, 0);
|
|
} else {
|
|
#ifdef CRYPT
|
|
if (doencrypt)
|
|
errx(1, "the -x flag requires Kerberos authentication.");
|
|
#endif /* CRYPT */
|
|
rem = rcmd_af(&host, sp->s_port, name, user, term, 0,
|
|
PF_UNSPEC);
|
|
if (rem < 0)
|
|
exit(1);
|
|
}
|
|
#else
|
|
rem = rcmd_af(&host, sp->s_port, name, user, term, 0, PF_UNSPEC);
|
|
|
|
#endif /* KERBEROS */
|
|
|
|
if (rem < 0)
|
|
exit(1);
|
|
|
|
if (dflag &&
|
|
setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0)
|
|
warn("setsockopt DEBUG (ignored)");
|
|
{
|
|
struct sockaddr_storage ss;
|
|
int sslen;
|
|
sslen = sizeof(ss);
|
|
if (getsockname(rem, (struct sockaddr *)&ss, &sslen) == 0
|
|
&& ((struct sockaddr *)&ss)->sa_family == AF_INET) {
|
|
one = IPTOS_LOWDELAY;
|
|
if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one,
|
|
sizeof(int)) < 0) {
|
|
warn("setsockopt TOS (ignored)");
|
|
}
|
|
}
|
|
}
|
|
|
|
(void)setuid(uid);
|
|
doit(&smask);
|
|
/*NOTREACHED*/
|
|
return (0);
|
|
}
|
|
|
|
int
|
|
speed(int fd)
|
|
{
|
|
struct termios tt;
|
|
|
|
(void)tcgetattr(fd, &tt);
|
|
|
|
return ((int)cfgetispeed(&tt));
|
|
}
|
|
|
|
pid_t child;
|
|
struct termios deftt;
|
|
struct termios nott;
|
|
|
|
void
|
|
doit(sigset_t *smask)
|
|
{
|
|
int i;
|
|
struct sigaction sa;
|
|
|
|
for (i = 0; i < NCCS; i++)
|
|
nott.c_cc[i] = _POSIX_VDISABLE;
|
|
tcgetattr(0, &deftt);
|
|
nott.c_cc[VSTART] = deftt.c_cc[VSTART];
|
|
nott.c_cc[VSTOP] = deftt.c_cc[VSTOP];
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = SIG_IGN;
|
|
(void)sigaction(SIGINT, &sa, (struct sigaction *) 0);
|
|
setsignal(SIGHUP);
|
|
setsignal(SIGQUIT);
|
|
mode(1);
|
|
child = fork();
|
|
if (child == -1) {
|
|
warn("fork");
|
|
done(1);
|
|
}
|
|
if (child == 0) {
|
|
mode(1);
|
|
if (reader(smask) == 0) {
|
|
msg("connection closed.");
|
|
exit(0);
|
|
}
|
|
sleep(1);
|
|
msg("\aconnection closed.");
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* We may still own the socket, and may have a pending SIGURG (or might
|
|
* receive one soon) that we really want to send to the reader. When
|
|
* one of these comes in, the trap copytochild simply copies such
|
|
* signals to the child. We can now unblock SIGURG and SIGUSR1
|
|
* that were set above.
|
|
*/
|
|
(void)sigprocmask(SIG_SETMASK, smask, (sigset_t *) 0);
|
|
sa.sa_handler = catch_child;
|
|
(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
|
|
writer();
|
|
msg("closed connection.");
|
|
done(0);
|
|
}
|
|
|
|
/* trap a signal, unless it is being ignored. */
|
|
void
|
|
setsignal(int sig)
|
|
{
|
|
struct sigaction sa;
|
|
sigset_t sigs;
|
|
|
|
sigemptyset(&sigs);
|
|
sigaddset(&sigs, sig);
|
|
sigprocmask(SIG_BLOCK, &sigs, &sigs);
|
|
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = exit;
|
|
sa.sa_flags = SA_RESTART;
|
|
(void)sigaction(sig, &sa, &sa);
|
|
if (sa.sa_handler == SIG_IGN)
|
|
(void)sigaction(sig, &sa, (struct sigaction *) 0);
|
|
|
|
(void)sigprocmask(SIG_SETMASK, &sigs, (sigset_t *) 0);
|
|
}
|
|
|
|
void
|
|
done(int status)
|
|
{
|
|
pid_t w;
|
|
int wstatus;
|
|
struct sigaction sa;
|
|
|
|
mode(0);
|
|
if (child > 0) {
|
|
/* make sure catch_child does not snap it up */
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = SIG_DFL;
|
|
sa.sa_flags = 0;
|
|
(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
|
|
if (kill(child, SIGKILL) >= 0)
|
|
while ((w = wait(&wstatus)) > 0 && w != child)
|
|
continue;
|
|
}
|
|
exit(status);
|
|
}
|
|
|
|
int dosigwinch;
|
|
|
|
/*
|
|
* This is called when the reader process gets the out-of-band (urgent)
|
|
* request to turn on the window-changing protocol.
|
|
*/
|
|
void
|
|
writeroob(int signo)
|
|
{
|
|
struct sigaction sa;
|
|
|
|
if (dosigwinch == 0) {
|
|
sendwindow();
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = sigwinch;
|
|
sa.sa_flags = SA_RESTART;
|
|
(void)sigaction(SIGWINCH, &sa, (struct sigaction *) 0);
|
|
}
|
|
dosigwinch = 1;
|
|
}
|
|
|
|
void
|
|
catch_child(int signo)
|
|
{
|
|
int status;
|
|
pid_t pid;
|
|
|
|
for (;;) {
|
|
pid = waitpid(-1, &status, WNOHANG|WUNTRACED);
|
|
if (pid == 0)
|
|
return;
|
|
/* if the child (reader) dies, just quit */
|
|
if (pid < 0 || (pid == child && !WIFSTOPPED(status)))
|
|
done(WEXITSTATUS(status) | WTERMSIG(status));
|
|
}
|
|
/* NOTREACHED */
|
|
}
|
|
|
|
/*
|
|
* writer: write to remote: 0 -> line.
|
|
* ~. terminate
|
|
* ~^Z suspend rlogin process.
|
|
* ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
|
|
*/
|
|
void
|
|
writer(void)
|
|
{
|
|
int bol, local, n;
|
|
char c;
|
|
|
|
bol = 1; /* beginning of line */
|
|
local = 0;
|
|
for (;;) {
|
|
n = read(STDIN_FILENO, &c, 1);
|
|
if (n <= 0) {
|
|
if (n < 0 && errno == EINTR)
|
|
continue;
|
|
break;
|
|
}
|
|
/*
|
|
* If we're at the beginning of the line and recognize a
|
|
* command character, then we echo locally. Otherwise,
|
|
* characters are echo'd remotely. If the command character
|
|
* is doubled, this acts as a force and local echo is
|
|
* suppressed.
|
|
*/
|
|
if (bol) {
|
|
bol = 0;
|
|
if (!noescape && c == escapechar) {
|
|
local = 1;
|
|
continue;
|
|
}
|
|
} else if (local) {
|
|
local = 0;
|
|
if (c == '.' || CCEQ(deftty.c_cc[VEOF], c)) {
|
|
echo((int)c);
|
|
break;
|
|
}
|
|
if (CCEQ(deftty.c_cc[VSUSP], c)) {
|
|
bol = 1;
|
|
echo((int)c);
|
|
stop(1);
|
|
continue;
|
|
}
|
|
if (CCEQ(deftty.c_cc[VDSUSP], c)) {
|
|
bol = 1;
|
|
echo((int)c);
|
|
stop(0);
|
|
continue;
|
|
}
|
|
if (c != escapechar) {
|
|
#ifdef KERBEROS
|
|
if (use_kerberos)
|
|
(void)kstream_write(krem,
|
|
(char *)&escapechar, 1);
|
|
else
|
|
#endif
|
|
(void)write(rem, &escapechar, 1);
|
|
}
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
if (use_kerberos) {
|
|
if (kstream_write(krem, &c, 1) == 0) {
|
|
msg("line gone");
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
#endif
|
|
if (write(rem, &c, 1) == 0) {
|
|
msg("line gone");
|
|
break;
|
|
}
|
|
|
|
bol = CCEQ(deftty.c_cc[VKILL], c) ||
|
|
CCEQ(deftty.c_cc[VEOF], c) ||
|
|
CCEQ(deftty.c_cc[VINTR], c) ||
|
|
CCEQ(deftty.c_cc[VSUSP], c) ||
|
|
c == '\r' || c == '\n';
|
|
}
|
|
}
|
|
|
|
void
|
|
echo(int i)
|
|
{
|
|
char c = (char)i;
|
|
char *p;
|
|
char buf[8];
|
|
|
|
p = buf;
|
|
c &= 0177;
|
|
*p++ = escapechar;
|
|
if (c < ' ') {
|
|
*p++ = '^';
|
|
*p++ = c + '@';
|
|
} else if (c == 0177) {
|
|
*p++ = '^';
|
|
*p++ = '?';
|
|
} else
|
|
*p++ = c;
|
|
*p++ = '\r';
|
|
*p++ = '\n';
|
|
(void)write(STDOUT_FILENO, buf, p - buf);
|
|
}
|
|
|
|
void
|
|
stop(int all)
|
|
{
|
|
struct sigaction sa;
|
|
|
|
mode(0);
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = SIG_IGN;
|
|
sa.sa_flags = SA_RESTART;
|
|
(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
|
|
(void)kill(all ? 0 : getpid(), SIGTSTP);
|
|
sa.sa_handler = catch_child;
|
|
(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
|
|
mode(1);
|
|
sigwinch(0); /* check for size changes */
|
|
}
|
|
|
|
void
|
|
sigwinch(int signo)
|
|
{
|
|
struct winsize ws;
|
|
|
|
if (dosigwinch && get_window_size(0, &ws) == 0 &&
|
|
memcmp(&ws, &winsize, sizeof(ws))) {
|
|
winsize = ws;
|
|
sendwindow();
|
|
}
|
|
}
|
|
|
|
/*
|
|
* Send the window size to the server via the magic escape
|
|
*/
|
|
void
|
|
sendwindow(void)
|
|
{
|
|
struct winsize *wp;
|
|
char obuf[4 + sizeof (struct winsize)];
|
|
|
|
wp = (struct winsize *)(obuf+4);
|
|
obuf[0] = 0377;
|
|
obuf[1] = 0377;
|
|
obuf[2] = 's';
|
|
obuf[3] = 's';
|
|
wp->ws_row = htons(winsize.ws_row);
|
|
wp->ws_col = htons(winsize.ws_col);
|
|
wp->ws_xpixel = htons(winsize.ws_xpixel);
|
|
wp->ws_ypixel = htons(winsize.ws_ypixel);
|
|
|
|
#ifdef KERBEROS
|
|
if (use_kerberos)
|
|
(void)kstream_write(krem, obuf, sizeof(obuf));
|
|
else
|
|
#endif
|
|
(void)write(rem, obuf, sizeof(obuf));
|
|
}
|
|
|
|
/*
|
|
* reader: read from remote: line -> 1
|
|
*/
|
|
#define READING 1
|
|
#define WRITING 2
|
|
|
|
jmp_buf rcvtop;
|
|
pid_t ppid;
|
|
int rcvcnt, rcvstate;
|
|
char rcvbuf[8 * 1024];
|
|
|
|
void
|
|
oob(int signo)
|
|
{
|
|
struct termios tty;
|
|
int atmark, n, rcvd;
|
|
char waste[BUFSIZ], mark;
|
|
|
|
rcvd = 0;
|
|
while (recv(rem, &mark, 1, MSG_OOB) < 0) {
|
|
switch (errno) {
|
|
case EWOULDBLOCK:
|
|
/*
|
|
* Urgent data not here yet. It may not be possible
|
|
* to send it yet if we are blocked for output and
|
|
* our input buffer is full.
|
|
*/
|
|
if (rcvcnt < sizeof(rcvbuf)) {
|
|
n = read(rem, rcvbuf + rcvcnt,
|
|
sizeof(rcvbuf) - rcvcnt);
|
|
if (n <= 0)
|
|
return;
|
|
rcvd += n;
|
|
} else {
|
|
n = read(rem, waste, sizeof(waste));
|
|
if (n <= 0)
|
|
return;
|
|
}
|
|
continue;
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
if (mark & TIOCPKT_WINDOW) {
|
|
/* Let server know about window size changes */
|
|
(void)kill(ppid, SIGUSR1);
|
|
}
|
|
if (!eight && (mark & TIOCPKT_NOSTOP)) {
|
|
(void)tcgetattr(0, &tty);
|
|
tty.c_iflag &= ~IXON;
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
}
|
|
if (!eight && (mark & TIOCPKT_DOSTOP)) {
|
|
(void)tcgetattr(0, &tty);
|
|
tty.c_iflag |= (deftty.c_iflag & IXON);
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
}
|
|
if (mark & TIOCPKT_FLUSHWRITE) {
|
|
(void)tcflush(1, TCIOFLUSH);
|
|
for (;;) {
|
|
if (ioctl(rem, SIOCATMARK, &atmark) < 0) {
|
|
warn("ioctl SIOCATMARK (ignored)");
|
|
break;
|
|
}
|
|
if (atmark)
|
|
break;
|
|
n = read(rem, waste, sizeof (waste));
|
|
if (n <= 0)
|
|
break;
|
|
}
|
|
/*
|
|
* Don't want any pending data to be output, so clear the recv
|
|
* buffer. If we were hanging on a write when interrupted,
|
|
* don't want it to restart. If we were reading, restart
|
|
* anyway.
|
|
*/
|
|
rcvcnt = 0;
|
|
longjmp(rcvtop, 1);
|
|
}
|
|
|
|
/* oob does not do FLUSHREAD (alas!) */
|
|
|
|
/*
|
|
* If we filled the receive buffer while a read was pending, longjmp
|
|
* to the top to restart appropriately. Don't abort a pending write,
|
|
* however, or we won't know how much was written.
|
|
*/
|
|
if (rcvd && rcvstate == READING)
|
|
longjmp(rcvtop, 1);
|
|
}
|
|
|
|
/* reader: read from remote: line -> 1 */
|
|
int
|
|
reader(sigset_t *smask)
|
|
{
|
|
pid_t pid;
|
|
int n, remaining;
|
|
char *bufp;
|
|
struct sigaction sa;
|
|
|
|
pid = getpid(); /* modern systems use positives for pid */
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = SIG_IGN;
|
|
(void)sigaction(SIGTTOU, &sa, (struct sigaction *) 0);
|
|
sa.sa_handler = oob;
|
|
(void)sigaction(SIGURG, &sa, (struct sigaction *) 0);
|
|
ppid = getppid();
|
|
(void)fcntl(rem, F_SETOWN, pid);
|
|
(void)setjmp(rcvtop);
|
|
(void)sigprocmask(SIG_SETMASK, smask, (sigset_t *) 0);
|
|
bufp = rcvbuf;
|
|
for (;;) {
|
|
while ((remaining = rcvcnt - (bufp - rcvbuf)) > 0) {
|
|
rcvstate = WRITING;
|
|
n = write(STDOUT_FILENO, bufp, remaining);
|
|
if (n < 0) {
|
|
if (errno != EINTR)
|
|
return (-1);
|
|
continue;
|
|
}
|
|
bufp += n;
|
|
}
|
|
bufp = rcvbuf;
|
|
rcvcnt = 0;
|
|
rcvstate = READING;
|
|
|
|
#ifdef KERBEROS
|
|
if (use_kerberos)
|
|
rcvcnt = kstream_read(krem, rcvbuf, sizeof(rcvbuf));
|
|
else
|
|
#endif
|
|
rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
|
|
|
|
if (rcvcnt == 0)
|
|
return (0);
|
|
if (rcvcnt < 0) {
|
|
if (errno == EINTR)
|
|
continue;
|
|
warn("read");
|
|
return (-1);
|
|
}
|
|
}
|
|
}
|
|
|
|
void
|
|
mode(int f)
|
|
{
|
|
struct termios tty;
|
|
|
|
switch (f) {
|
|
case 0:
|
|
(void)tcsetattr(0, TCSANOW, &deftty);
|
|
break;
|
|
case 1:
|
|
(void)tcgetattr(0, &deftty);
|
|
tty = deftty;
|
|
/* This is loosely derived from sys/compat/tty_compat.c. */
|
|
tty.c_lflag &= ~(ECHO|ICANON|ISIG|IEXTEN);
|
|
tty.c_iflag &= ~ICRNL;
|
|
tty.c_oflag &= ~OPOST;
|
|
tty.c_cc[VMIN] = 1;
|
|
tty.c_cc[VTIME] = 0;
|
|
if (eight) {
|
|
tty.c_iflag &= IXOFF;
|
|
tty.c_cflag &= ~(CSIZE|PARENB);
|
|
tty.c_cflag |= CS8;
|
|
}
|
|
(void)tcsetattr(0, TCSANOW, &tty);
|
|
break;
|
|
|
|
default:
|
|
return;
|
|
}
|
|
}
|
|
|
|
void
|
|
lostpeer(int signo)
|
|
{
|
|
struct sigaction sa;
|
|
sa.sa_flags = SA_RESTART;
|
|
sa.sa_handler = SIG_IGN;
|
|
(void)sigaction(SIGPIPE, &sa, (struct sigaction *)0);
|
|
msg("\aconnection closed.");
|
|
done(1);
|
|
}
|
|
|
|
/* copy SIGURGs to the child process. */
|
|
void
|
|
copytochild(int signo)
|
|
{
|
|
|
|
(void)kill(child, SIGURG);
|
|
}
|
|
|
|
void
|
|
msg(char *str)
|
|
{
|
|
|
|
(void)fprintf(stderr, "rlogin: %s\r\n", str);
|
|
}
|
|
|
|
#ifdef KERBEROS
|
|
/* VARARGS */
|
|
void
|
|
warning(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
|
|
(void)fprintf(stderr, "rlogin: warning, using standard rlogin: ");
|
|
va_start(ap, fmt);
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
(void)fprintf(stderr, ".\n");
|
|
}
|
|
#endif
|
|
|
|
void
|
|
usage(void)
|
|
{
|
|
(void)fprintf(stderr,
|
|
"usage: rlogin [-%s]%s[-e char] [-l username] [-p port] [username@]host\n",
|
|
#ifdef KERBEROS
|
|
#ifdef CRYPT
|
|
"8EKLdx", " [-k realm] ");
|
|
#else
|
|
"8EKLd", " [-k realm] ");
|
|
#endif
|
|
#else
|
|
"8ELd", " ");
|
|
#endif
|
|
exit(1);
|
|
}
|
|
|
|
/*
|
|
* The following routine provides compatibility (such as it is) between older
|
|
* Suns and others. Suns have only a `ttysize', so we convert it to a winsize.
|
|
*/
|
|
#ifdef OLDSUN
|
|
int
|
|
get_window_size(fd, wp)
|
|
int fd;
|
|
struct winsize *wp;
|
|
{
|
|
struct ttysize ts;
|
|
int error;
|
|
|
|
if ((error = ioctl(0, TIOCGSIZE, &ts)) != 0)
|
|
return (error);
|
|
wp->ws_row = ts.ts_lines;
|
|
wp->ws_col = ts.ts_cols;
|
|
wp->ws_xpixel = 0;
|
|
wp->ws_ypixel = 0;
|
|
return (0);
|
|
}
|
|
#endif
|
|
|
|
u_int
|
|
getescape(char *p)
|
|
{
|
|
long val;
|
|
int len;
|
|
|
|
if ((len = strlen(p)) == 1) /* use any single char, including '\' */
|
|
return ((u_int)*p);
|
|
/* otherwise, \nnn */
|
|
if (*p == '\\' && len >= 2 && len <= 4) {
|
|
val = strtol(++p, NULL, 8);
|
|
for (;;) {
|
|
if (!*++p)
|
|
return ((u_int)val);
|
|
if (*p < '0' || *p > '8')
|
|
break;
|
|
}
|
|
}
|
|
msg("illegal option value -- e");
|
|
usage();
|
|
/* NOTREACHED */
|
|
return (0);
|
|
}
|