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minix/commands/rlogin/rlogin.c

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/*
* Copyright (c) 1983, 1990 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.
*/
#ifndef lint
char copyright[] =
"@(#) Copyright (c) 1983, 1990 The Regents of the University of California.\n\
All rights reserved.\n";
#endif /* not lint */
#ifndef lint
#ifdef ID
static char sccsid[] = "@(#)rlogin.c 5.33 (Berkeley) 3/1/91";
#endif
#endif /* not lint */
/*
* $Source$
* $Header: mit/rlogin/RCS/rlogin.c,v 5.2 89/07/26 12:11:21 kfall
* Exp Locker: kfall $
*/
/*
* rlogin - remote login
*/
#include <sys/ioctl.h>
#include <sys/types.h>
#include <sys/wait.h>
#include <net/netlib.h>
#include <net/hton.h>
#include <net/gen/in.h>
#include <net/gen/netdb.h>
#include <net/gen/tcp.h>
#include <net/gen/tcp_io.h>
#include <termios.h>
#include <setjmp.h>
#include <errno.h>
#include <pwd.h>
#include <stdio.h>
#include <unistd.h>
#include <string.h>
#include <assert.h>
#include <ctype.h>
#include <fcntl.h>
#include <signal.h>
#include <stdlib.h>
#ifdef KERBEROS
#include <kerberosIV/des.h>
#include <kerberosIV/krb.h>
CREDENTIALS cred;
Key_schedule schedule;
int use_kerberos = 1, doencrypt;
char dst_realm_buf[REALM_SZ], *dest_realm = NULL;
extern char *krb_realmofhost();
#endif
#ifndef TIOCPKT_WINDOW
#define TIOCPKT_WINDOW 0x80
#endif
/* concession to Sun */
#ifndef SIGUSR1
#define SIGUSR1 30
#endif
extern int errno;
int eight, litout, rem;
int noescape;
u_char escapechar = '~';
struct speed
{
speed_t speed;
char *name;
} speeds[] = {
{ B0, "0" }, { B50, "50" }, { B75, "75" }, { B110, "110" },
{ B134, "134" }, { B150, "150" }, { B200, "200" }, { B300, "300" },
{ B600, "600" }, { B1200, "1200" }, { B1800, "1800" },
{ B2400, "2400" }, { B4800, "4800" }, { B9600, "9600" },
{ B19200, "19200" }, { B38400, "38400" }, { B57600, "57600" },
{ B115200, "115200" },
{ -1, NULL },
};
#if __minix_vmd
/* flow control variables */
int more2read_0;
int inprogress_0;
int more2write_1;
int inprogress_1;
int more2read_rem;
int inprogress_rd_rem;
int more2write_rem;
int inprogress_wr_rem;
/* write to remote */
size_t wr_rem_size;
size_t wr_rem_offset;
size_t extra_wr_rem_size;
size_t extra_wr_rem_offset;
char *extra_wr_rem;
size_t extra_wr_rem_new_size;
char *extra_wr_rem_new;
#endif /* __minix_vmd */
struct winsize winsize;
#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
extern int main( int argc, char **argv );
static void usage( void );
static u_char getescape( char *p );
static char *speeds2str( speed_t speed );
static void lostpeer( int sig );
static void doit( void );
static void setsignal( int sig, void (*act)(int sig) );
static void msg( char *str );
static void done( int status );
#if !__minix_vmd
static int reader( void );
#endif
static void mode( int f );
#if __minix_vmd
static void mark_async( int fd );
static void init_0( void );
static void init_1( void );
static void init_rd_rem( void );
static void init_wr_rem( void );
static void restart_0( void );
static void restart_1( void );
static void restart_rd_rem( void );
static void restart_wr_rem( void );
static void completed_0( int result, int error );
static void completed_1( int result, int error );
static void completed_rd_rem( int result, int error );
static void completed_wr_rem( int result, int error );
static void do_urg( int urg_byte );
#endif
#if !__minix_vmd
static void catch_child( int sig );
static void writer( void );
#endif
static void echo( int c );
#if __minix_vmd
static void finish( void );
static void sendwindow( void );
static void sigwinch( int sig );
static void subshell( void );
#endif
int main(argc, argv)
int argc;
char **argv;
{
extern char *optarg;
extern int optind;
struct passwd *pw;
struct servent *sp;
struct termios ttyb;
nwio_tcpopt_t tcpopt;
int error;
int argoff, ch, dflag, one, uid;
char *host, *p, *user, term[1024];
argoff = dflag = 0;
one = 1;
host = user = NULL;
if (p = rindex(argv[0], '/'))
++p;
else
p = argv[0];
if (strcmp(p, "rlogin"))
host = p;
/* handle "rlogin host flags" */
if (!host && argc > 2 && argv[1][0] != '-') {
host = argv[1];
argoff = 1;
}
#ifdef KERBEROS
#define OPTIONS "8EKLde:k:l:x"
#else
#define OPTIONS "8EKLde:l:"
#endif
while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != EOF)
switch(ch) {
case '8':
eight = 1;
break;
case 'E':
noescape = 1;
break;
case 'K':
#ifdef KERBEROS
use_kerberos = 0;
#endif
break;
case 'L':
litout = 1;
break;
case 'd':
dflag = 1;
break;
case 'e':
escapechar = getescape(optarg);
break;
#ifdef KERBEROS
case 'k':
dest_realm = dst_realm_buf;
(void)strncpy(dest_realm, optarg, REALM_SZ);
break;
#endif
case 'l':
user = optarg;
break;
#ifdef CRYPT
#ifdef KERBEROS
case 'x':
doencrypt = 1;
des_set_key(cred.session, schedule);
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()))) {
(void)fprintf(stderr, "rlogin: unknown user id.\n");
exit(1);
}
if (!user)
user = pw->pw_name;
sp = NULL;
#ifdef KERBEROS
if (use_kerberos) {
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) {
(void)fprintf(stderr, "rlogin: login/tcp: unknown service.\n");
exit(1);
}
(void)strncpy(term, (p = getenv("TERM")) ? p : "network", sizeof(term));
term[sizeof(term)-1]= 0;
if (tcgetattr(0, &ttyb) == 0) {
(void)strcat(term, "/");
(void)strcat(term, speeds2str(cfgetospeed(&ttyb)));
}
(void)get_window_size(0, &winsize);
(void)signal(SIGPIPE, lostpeer);
#ifdef KERBEROS
try_connect:
if (use_kerberos) {
rem = KSUCCESS;
errno = 0;
if (dest_realm == NULL)
dest_realm = krb_realmofhost(host);
#ifdef CRYPT
if (doencrypt)
rem = krcmd_mutual(&host, sp->s_port, user, term, 0,
dest_realm, &cred, schedule);
else
#endif /* CRYPT */
rem = krcmd(&host, sp->s_port, user, term, 0,
dest_realm);
if (rem < 0) {
use_kerberos = 0;
sp = getservbyname("login", "tcp");
if (sp == NULL) {
(void)fprintf(stderr,
"rlogin: unknown service login/tcp.\n");
exit(1);
}
if (errno == ECONNREFUSED)
warning("remote host doesn't support Kerberos");
if (errno == ENOENT)
warning("can't provide Kerberos auth data");
goto try_connect;
}
} else {
#ifdef CRYPT
if (doencrypt) {
(void)fprintf(stderr,
"rlogin: the -x flag requires Kerberos authentication.\n");
exit(1);
}
#endif /* CRYPT */
rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
}
#else
rem = rcmd(&host, sp->s_port, pw->pw_name, user, term, 0);
#endif /* KERBEROS */
if (rem < 0)
exit(1);
/* Enable BSD compatibility for urgent data. */
tcpopt.nwto_flags= NWTO_BSD_URG;
error= ioctl(rem, NWIOSTCPOPT, &tcpopt);
if (error == -1)
{
fprintf(stderr, "rlogin: NWIOSTCPOPT failed: %s\n",
strerror(errno));
}
(void)setuid(uid);
doit();
/*NOTREACHED*/
}
struct termios defattr, rawattr;
#if __minix_vmd
int mustsendwindow;
#else
int child;
#endif
static void
doit()
{
struct termios sb;
#if !__minix_vmd
int r;
#else
asio_fd_set_t fd_set;
struct fwait fw;
int result;
#endif
(void)tcgetattr(0, &sb);
defattr = sb;
rawattr = sb;
rawattr.c_iflag &= ~(ICRNL | IGNCR | INLCR | ISTRIP | IXOFF | IXON |
PARMRK | IXANY);
rawattr.c_oflag &= ~(OPOST);
rawattr.c_lflag &= ~(ECHONL | ECHO | ICANON | IEXTEN | ISIG);
(void)signal(SIGINT, SIG_IGN);
setsignal(SIGHUP, exit);
setsignal(SIGQUIT, exit);
#if !__minix_vmd
child = fork();
if (child == -1) {
(void)fprintf(stderr, "rlogin: fork: %s.\n", strerror(errno));
done(1);
}
if (child == 0) {
mode(1);
r = reader();
if (r == 0) {
msg("connection closed.");
exit(0);
}
sleep(1);
msg("\007connection closed.");
exit(1);
}
(void)signal(SIGCHLD, catch_child);
writer();
#else /* __minix_vmd */
mode(1);
/* mark the file descriptors 0, 1, and rem as asynchronous. */
mark_async(0);
mark_async(1);
mark_async(rem);
init_0();
init_1();
init_rd_rem();
init_wr_rem();
for (;;)
{
ASIO_FD_ZERO(&fd_set);
fw.fw_flags= 0;
fw.fw_bits= fd_set.afds_bits;
fw.fw_maxfd= ASIO_FD_SETSIZE;
if (more2read_0 && !inprogress_0)
{
restart_0();
fw.fw_flags |= FWF_NONBLOCK;
}
if (more2write_1 && !inprogress_1)
{
restart_1();
fw.fw_flags |= FWF_NONBLOCK;
}
if (more2read_rem && !inprogress_rd_rem)
{
restart_rd_rem();
fw.fw_flags |= FWF_NONBLOCK;
}
if (more2write_rem && !inprogress_wr_rem)
{
restart_wr_rem();
fw.fw_flags |= FWF_NONBLOCK;
}
if (more2read_0 && inprogress_0)
ASIO_FD_SET(0, ASIO_READ, &fd_set);
if (more2write_1 && inprogress_1)
ASIO_FD_SET(1, ASIO_WRITE, &fd_set);
if (more2read_rem && inprogress_rd_rem)
ASIO_FD_SET(rem, ASIO_READ, &fd_set);
if (more2write_rem && inprogress_wr_rem)
ASIO_FD_SET(rem, ASIO_WRITE, &fd_set);
for (;;)
{
result= fwait(&fw);
if (result == -1 && (errno == EAGAIN ||
errno == EINTR))
{
break;
}
if (result == -1)
{
fprintf(stderr, "fwait failed (%s)\n",
strerror(errno));
exit(1);
}
assert(result == 0);
#if 0
printf("fwait: fw_fw= %d, fw_operation= %d, fw_result= %d, fw.fw_errno= %d\n",
fw.fw_fd, fw.fw_operation, fw.fw_result, fw.fw_errno);
#endif
if (fw.fw_fd == 0 && fw.fw_operation == ASIO_READ)
{
completed_0(fw.fw_result, fw.fw_errno);
}
else if (fw.fw_fd == 1 &&
fw.fw_operation == ASIO_WRITE)
{
completed_1(fw.fw_result, fw.fw_errno);
}
else if (fw.fw_fd == rem &&
fw.fw_operation == ASIO_READ)
{
completed_rd_rem(fw.fw_result, fw.fw_errno);
}
else if (fw.fw_fd == rem &&
fw.fw_operation == ASIO_WRITE)
{
completed_wr_rem(fw.fw_result, fw.fw_errno);
}
else
{
fprintf(stderr,
"strange result from fwait: fd= %d, operation= %d\n",
fw.fw_fd, fw.fw_operation);
exit(1);
}
if (!(fw.fw_flags & FWF_MORE))
break;
}
if (mustsendwindow)
{
mustsendwindow= 0;
sendwindow();
}
}
#endif /* __minix_vmd */
msg("connection closed.");
done(0);
}
/* trap a signal, unless it is being ignored. */
static void
setsignal(sig, act)
int sig;
void(*act) ( int sig );
{
if (signal(sig, act) == SIG_IGN)
(void)signal(sig, SIG_IGN);
}
static void
done(status)
int status;
{
int w, wstatus;
mode(0);
#if !__minix_vmd
if (child > 0) {
/* make sure catch_child does not snap it up */
(void)signal(SIGCHLD, SIG_DFL);
if (kill(child, SIGKILL) >= 0)
while ((w = wait(&wstatus)) > 0 && w != child);
}
#endif
exit(status);
}
int dosigwinch;
#if !__minix
void sigwinch();
#endif
#if !__minix_vmd
static void
catch_child(sig)
int sig;
{
int status;
int 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(WTERMSIG(status) | WEXITSTATUS(status));
}
/* NOTREACHED */
}
#endif
#if !__minix_vmd
/*
* writer: write to remote: 0 -> line.
* ~. terminate
* ~^Z suspend rlogin process.
* ~<delayed-suspend char> suspend rlogin process, but leave reader alone.
*/
static void
writer()
{
register int bol, local, n;
u_char ch;
int c;
bol = 1; /* beginning of line */
local = 0;
for (;;) {
n = read(STDIN_FILENO, &ch, 1);
if (n <= 0) {
if (n < 0 && errno == EINTR)
continue;
break;
}
c = ch;
/*
* 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 == '.' || c == defattr.c_cc[VEOF]) {
echo(c);
break;
}
#if !__minix
if (c == defattr.c_cc[VSUSP]) {
bol = 1;
echo(c);
stop(c);
continue;
}
#endif
if (c != escapechar)
#ifdef CRYPT
#ifdef KERBEROS
if (doencrypt)
(void)des_write(rem, &escapechar, 1);
else
#endif
#endif
(void)write(rem, &escapechar, 1);
}
ch = c;
#ifdef CRYPT
#ifdef KERBEROS
if (doencrypt) {
if (des_write(rem, &ch, 1) == 0) {
msg("line gone");
break;
}
} else
#endif
#endif
if (write(rem, &ch, 1) == 0) {
msg("line gone");
break;
}
bol = c == defattr.c_cc[VKILL] ||
c == defattr.c_cc[VEOF] ||
c == defattr.c_cc[VINTR] ||
c == defattr.c_cc[VSUSP] ||
c == '\r' || c == '\n';
}
}
#endif
#if !__minix_vmd
static void
echo(c)
int c;
{
register 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);
}
#endif
#if !__minix
stop(cmdc)
char cmdc;
{
mode(0);
(void)signal(SIGCHLD, SIG_IGN);
(void)kill(cmdc == defltc.t_suspc ? 0 : getpid(), SIGTSTP);
(void)signal(SIGCHLD, catch_child);
mode(1);
sigwinch(); /* check for size changes */
}
#endif
#if __minix_vmd
#ifdef SIGWINCH
static void
sigwinch(sig)
int sig;
{
struct winsize ws;
#if __minix
signal(SIGWINCH, sigwinch);
#endif
if (dosigwinch && get_window_size(0, &ws) == 0 &&
memcmp(&ws, &winsize, sizeof(ws))) {
winsize = ws;
mustsendwindow= 1;
}
}
/*
* Send the window size to the server via the magic escape
*/
static void
sendwindow()
{
struct winsize *wp;
char *obuf, *new_buf;
new_buf= realloc(extra_wr_rem_new,
extra_wr_rem_new_size+4+sizeof(*wp));
if (new_buf == 0)
return;
extra_wr_rem_new= new_buf;
obuf= new_buf+extra_wr_rem_new_size;
extra_wr_rem_new_size += 4+sizeof(*wp);
more2read_0= 0;
more2write_rem= 1;
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);
}
#endif /* SIGWINCH */
#endif
#if !__minix_vmd
/*
* reader: read from remote: line -> 1
*/
#define READING 1
#define WRITING 2
int rcvcnt, rcvstate;
char rcvbuf[8 * 1024];
static int
reader()
{
int pid = -getpid();
int n, remaining;
char *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 CRYPT
#ifdef KERBEROS
if (doencrypt)
rcvcnt = des_read(rem, rcvbuf, sizeof(rcvbuf));
else
#endif
#endif
rcvcnt = read(rem, rcvbuf, sizeof (rcvbuf));
if (rcvcnt == 0)
return (0);
if (rcvcnt < 0) {
if (errno == EINTR)
continue;
if (errno == EURG) {
nwio_tcpopt_t tcpopt;
#if DEBUG
fprintf(stderr, "\n\rEURG\n\r");
#endif
tcpopt.nwto_flags= NWTO_RCV_URG;
if (ioctl(rem, NWIOSTCPOPT, &tcpopt) == -1) {
fprintf(stderr,
"rlogin: trouble with urgent data: %s\n",
strerror(errno));
return(-1);
}
continue;
}
if (errno == ENOURG) {
nwio_tcpopt_t tcpopt;
#if DEBUG
fprintf(stderr, "\n\rENOURG\n\r");
#endif
tcpopt.nwto_flags= NWTO_RCV_NOTURG;
if (ioctl(rem, NWIOSTCPOPT, &tcpopt) == -1) {
fprintf(stderr,
"rlogin: trouble with not-urgent data: %s\n",
strerror(errno));
return(-1);
}
continue;
}
(void)fprintf(stderr, "rlogin: read: %s\n",
strerror(errno));
return(-1);
}
}
}
#endif /* !__minix_vmd */
static void
mode(f)
int f;
{
struct termios *sb;
switch(f) {
case 0:
sb= &defattr;
break;
case 1:
sb= &rawattr;
break;
default:
return;
}
(void)tcsetattr(0, TCSAFLUSH, sb);
}
static void
lostpeer(sig)
int sig;
{
(void)signal(SIGPIPE, SIG_IGN);
msg("\007connection closed.");
done(1);
}
static void
msg(str)
char *str;
{
(void)fprintf(stderr, "rlogin: %s\r\n", str);
}
#ifdef KERBEROS
/* VARARGS */
warning(va_alist)
va_dcl
{
va_list ap;
char *fmt;
(void)fprintf(stderr, "rlogin: warning, using standard rlogin: ");
va_start(ap);
fmt = va_arg(ap, char *);
vfprintf(stderr, fmt, ap);
va_end(ap);
(void)fprintf(stderr, ".\n");
}
#endif
static void
usage()
{
(void)fprintf(stderr,
"Usage: rlogin [-%s]%s[-e char] [-l username] host\n",
#ifdef KERBEROS
#ifdef CRYPT
"8ELx", " [-k realm] ");
#else
"8EL", " [-k realm] ");
#endif
#else
"8EL", " ");
#endif
exit(1);
}
/*
* The following routine provides compatibility (such as it is) between 4.2BSD
* Suns and others. Suns have only a `ttysize', so we convert it to a winsize.
*/
#ifdef sun
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
static u_char
getescape(p)
register char *p;
{
long val;
int len;
if ((len = strlen(p)) == 1) /* use any single char, including '\' */
return((u_char)*p);
/* otherwise, \nnn */
if (*p == '\\' && len >= 2 && len <= 4) {
val = strtol(++p, (char **)NULL, 8);
for (;;) {
if (!*++p)
return((u_char)val);
if (*p < '0' || *p > '8')
break;
}
}
msg("illegal option value -- e");
usage();
/* NOTREACHED */
}
static char *
speeds2str(speed)
speed_t speed;
{
int i;
for (i= 0; speeds[i].name != NULL && speeds[i].speed != speed; i++) {
if (speeds[i].speed == speed) return speeds[i].name;
}
return "unknown";
}
#if __minix_vmd
static void
mark_async(fd)
int fd;
{
int result;
int v;
result= fcntl(fd, F_GETFD);
if (result == -1)
{
fprintf(stderr,
"rlogin: mark_async: fcntl(%d, GETFD) failed (%s)\n",
fd, strerror(errno));
exit(1);
}
v= result | FD_ASYNCHIO;
result= fcntl(fd, F_SETFD, v);
if (result == -1)
{
fprintf(stderr,
"rlogin: mark_async: fcntl(%d, SETFD, %d) failed (%s)\n",
fd, v, strerror(errno));
exit(1);
}
}
#define RD_0_BUFSIZE 256
char rd_0_buf[RD_0_BUFSIZE];
size_t rd_0_offset;
static void
init_0()
{
more2read_0= 1;
inprogress_0= 0;
rd_0_offset= 0;
}
size_t wr_1_size;
size_t wr_1_offset;
char *urg_1;
size_t urg_1_size;
char *extra_1;
size_t extra_1_size;
size_t extra_1_offset;
char *extra_1_new;
size_t extra_1_new_size;
#define MAX_EXTRA_1_NEW_SIZE (16*1024)
static void
init_1()
{
more2write_1= 0;
inprogress_1= 0;
wr_1_size= 0;
wr_1_offset= 0;
urg_1= NULL;
urg_1_size= 0;
extra_1= NULL;
extra_1_size= 0;
extra_1_offset= 0;
extra_1_new= NULL;
extra_1_new_size= 0;
}
#define RD_REM_BUFSIZE (8*1024)
char rd_rem_buf[RD_REM_BUFSIZE];
size_t rd_rem_offset;
int rd_rem_urg;
static void
init_rd_rem()
{
more2read_rem= 1;
inprogress_rd_rem= 0;
rd_rem_offset= 0;
rd_rem_urg= 0;
}
static void
init_wr_rem()
{
more2write_rem= 0;
inprogress_wr_rem= 0;
wr_rem_size= 0;
wr_rem_offset= 0;
extra_wr_rem_size= 0;
extra_wr_rem_offset= 0;
extra_wr_rem= NULL;
extra_wr_rem_new_size= 0;
extra_wr_rem_new= NULL;
}
static void
restart_0()
{
size_t offset;
int result, error;
assert(!inprogress_0);
rd_0_offset= 1;
offset= 0;
while (offset < RD_0_BUFSIZE)
{
result= read(0, rd_0_buf+rd_0_offset+offset,
RD_0_BUFSIZE-rd_0_offset-offset);
if (result > 0)
{
offset += result;
assert(rd_0_offset+offset <= RD_0_BUFSIZE);
continue;
}
error= errno;
if (offset != 0)
completed_0(offset, 0);
rd_0_offset += offset;
if (result == -1 && error == EINPROGRESS)
{
inprogress_0= 1;
return;
}
completed_0(result, error);
return;
}
completed_0(offset, 0);
}
static void
restart_1()
{
size_t offset;
int result, error;
assert(!inprogress_1);
while (extra_1 != NULL || extra_1_new != NULL)
{
if (extra_1 == NULL)
{
extra_1= extra_1_new;
extra_1_new= NULL;
extra_1_size= extra_1_new_size;
extra_1_new_size= 0;
extra_1_offset= 0;
}
offset= 0;
#if DEBUG
if (extra_1_size == 0)
fprintf(stderr, "restart_1: extra_1_size= 0\n");
#endif
while (offset < extra_1_size)
{
result= write(1, extra_1+extra_1_offset+offset,
extra_1_size-offset);
if (result > 0)
{
assert (result <= extra_1_size-offset);
offset += result;
continue;
}
error= errno;
if (offset != 0)
completed_1(offset, 0);
if (result == -1 && errno == EINPROGRESS)
{
inprogress_1= 1;
return;
}
completed_1(result, errno);
return;
}
completed_1(offset, 0);
}
offset= 0;
if (wr_1_size == 0)
{
more2write_1= 0;
more2read_rem= 1;
return;
}
while (offset < wr_1_size)
{
result= write(1, rd_rem_buf+wr_1_offset+offset,
wr_1_size-offset);
if (result > 0)
{
assert (result <= wr_1_size-offset);
offset += result;
continue;
}
error= errno;
if (offset != 0)
completed_1(offset, 0);
if (result == -1 && errno == EINPROGRESS)
{
inprogress_1= 1;
return;
}
completed_1(result, errno);
return;
}
completed_1(offset, 0);
}
static void
restart_rd_rem()
{
size_t offset;
int result, error;
assert(!inprogress_rd_rem);
rd_rem_offset= 0;
offset= 0;
while (offset < RD_REM_BUFSIZE)
{
result= read(rem, rd_rem_buf+offset, RD_REM_BUFSIZE-offset);
if (result > 0)
{
offset += result;
assert(offset <= RD_REM_BUFSIZE);
continue;
}
error= errno;
if (offset != 0)
completed_rd_rem(offset, 0);
rd_rem_offset= offset;
if (result == -1 && error == EINPROGRESS)
{
inprogress_rd_rem= 1;
return;
}
completed_rd_rem(result, error);
return;
}
completed_rd_rem(offset, 0);
}
static void
restart_wr_rem()
{
size_t offset;
int result, error;
assert(!inprogress_wr_rem);
if (extra_wr_rem_new != NULL && extra_wr_rem == NULL)
{
extra_wr_rem= extra_wr_rem_new;
extra_wr_rem_size= extra_wr_rem_new_size;
extra_wr_rem_offset= 0;
extra_wr_rem_new= NULL;
extra_wr_rem_new_size= 0;
}
if (extra_wr_rem != NULL)
{
offset= 0;
while (offset < extra_wr_rem_size)
{
result= write(rem,
extra_wr_rem+extra_wr_rem_offset+offset,
extra_wr_rem_size-offset);
if (result > 0)
{
assert (result <= extra_wr_rem_size-offset);
offset += result;
continue;
}
error= errno;
if (offset != 0)
completed_wr_rem(offset, 0);
if (result == -1 && errno == EINPROGRESS)
{
inprogress_wr_rem= 1;
return;
}
completed_wr_rem(result, errno);
return;
}
completed_wr_rem(offset, 0);
}
if (wr_rem_size == 0)
return;
offset= 0;
while (offset < wr_rem_size)
{
result= write(rem, rd_0_buf+wr_rem_offset+offset,
wr_rem_size-offset);
if (result > 0)
{
assert (result <= wr_rem_size-offset);
offset += result;
continue;
}
error= errno;
if (offset != 0)
completed_wr_rem(offset, 0);
if (result == -1 && errno == EINPROGRESS)
{
inprogress_wr_rem= 1;
return;
}
completed_wr_rem(result, errno);
return;
}
completed_wr_rem(offset, 0);
}
static void
completed_0(result, error)
int result;
int error;
{
static int bol= 0, local= 0;
char *iptr, *optr;
int i;
u_char c;
inprogress_0= 0;
if (result > 0)
{
assert(rd_0_offset > 0);
wr_rem_offset= 1;
iptr= rd_0_buf+rd_0_offset;
optr= rd_0_buf+wr_rem_offset;
for (i= 0; i<result; iptr++, i++)
{
c= *iptr;
if (bol)
{
bol= 0;
if (!noescape && c == escapechar)
{
local= 1;
continue;
}
}
else if (local)
{
local= 0;
if (c == '.' || (c != _POSIX_VDISABLE &&
c == defattr.c_cc[VEOF]))
{
echo(c);
finish();
/* NOTREACHED */
}
if (c == '!')
{
subshell();
continue;
}
if (c != escapechar)
{
if (optr < iptr)
{
*(optr++)= escapechar;
}
else
{
assert(optr == iptr);
assert(iptr == rd_0_buf+
rd_0_offset);
assert(rd_0_offset > 0);
wr_rem_offset--;
optr[-1]= escapechar;
}
}
}
*(optr++)= c;
bol= (c != _POSIX_VDISABLE) &&
(c == defattr.c_cc[VKILL] ||
c == defattr.c_cc[VEOF] ||
c == defattr.c_cc[VINTR] ||
c == defattr.c_cc[VSUSP] ||
c == '\r' || c == '\n');
}
wr_rem_size += optr-rd_0_buf-wr_rem_offset;
if (wr_rem_size != 0)
{
more2read_0= 0;
more2write_rem= 1;
}
return;
} else
if (result < 0) {
fprintf(stderr, "rlogin: %s\n", strerror(error));
}
done(1);
}
static void
completed_1(result, error)
int result;
int error;
{
inprogress_1= 0;
if (result > 0)
{
if (extra_1 != NULL)
{
assert (result <= extra_1_size);
extra_1_size -= result;
extra_1_offset += result;
if (extra_1_size == 0)
{
more2write_1= 0;
more2read_rem= 1;
free(extra_1);
extra_1= NULL;
}
return;
}
assert (result <= wr_1_size);
wr_1_size -= result;
wr_1_offset += result;
if (wr_1_size == 0)
{
more2write_1= 0;
more2read_rem= 1;
}
return;
} else
if (result < 0) {
fprintf(stderr, "rlogin: %s\n", strerror(error));
}
done(1);
}
static void
completed_rd_rem(result, error)
int result;
int error;
{
nwio_tcpopt_t tcpopt;
char *new_buf;
size_t keep_size;
u_char urg_byte;
int i;
inprogress_rd_rem= 0;
if (result > 0)
{
if (rd_rem_urg)
{
#if DEBUG
fprintf(stderr, "\n\r%d urg bytes\n\r", result);
#endif
if (urg_1_size > MAX_EXTRA_1_NEW_SIZE)
{
keep_size= MAX_EXTRA_1_NEW_SIZE/2;
memmove(urg_1, urg_1+urg_1_size-keep_size,
keep_size);
urg_1_size= keep_size;
}
new_buf= realloc(urg_1, urg_1_size+result);
if (new_buf == NULL)
{
fprintf(stderr,
"rlogin: warning realloc %d failed\n",
urg_1_size+result);
return;
}
memcpy(new_buf+urg_1_size,
rd_rem_buf+rd_rem_offset, result);
urg_1= new_buf;
urg_1_size += result;
return;
}
more2read_rem= 0;
more2write_1= 1;
wr_1_size= result;
wr_1_offset= rd_rem_offset;
return;
}
if (result == -1 && error == EURG)
{
#if DEBUG
fprintf(stderr, "\n\rEURG\n\r");
#endif
rd_rem_urg= 1;
tcpopt.nwto_flags= NWTO_RCV_URG;
result= ioctl(rem, NWIOSTCPOPT, &tcpopt);
if (result == -1)
{
fprintf(stderr,
"rlogin: NWIOSTCPOPT on %d failed (%s)\n",
rem, strerror(errno));
exit(1);
}
return;
}
if (result == -1 && error == ENOURG)
{
#if DEBUG
fprintf(stderr, "\n\rENOURG\n\r");
#endif
rd_rem_urg= 0;
tcpopt.nwto_flags= NWTO_RCV_NOTURG;
result= ioctl(rem, NWIOSTCPOPT, &tcpopt);
if (result == -1)
{
fprintf(stderr,
"rlogin: NWIOSTCPOPT on %d failed (%s)\n",
rem, strerror(errno));
exit(1);
}
if (urg_1_size != 0)
{
urg_byte= urg_1[urg_1_size-1];
urg_1_size--;
do_urg(urg_byte);
if (urg_1_size == 0)
return;
if (extra_1_new_size + urg_1_size > MAX_EXTRA_1_NEW_SIZE)
{
extra_1_new_size= 0;
free(extra_1_new);
extra_1_new= NULL;
}
if (extra_1_new_size != 0)
{
new_buf= realloc(extra_1_new,
extra_1_new_size+urg_1_size);
if (new_buf == 0)
{
extra_1_new_size= 0;
free(extra_1_new);
extra_1_new= NULL;
}
else
{
extra_1_new= new_buf;
memcpy(extra_1_new+extra_1_new_size,
urg_1, urg_1_size);
extra_1_new_size += urg_1_size;
urg_1_size= 0;
free(urg_1);
urg_1= NULL;
}
}
if (extra_1_new_size == 0)
{
extra_1_new_size= urg_1_size;
extra_1_new= urg_1;
urg_1_size= 0;
urg_1= NULL;
}
more2read_rem= 0;
more2write_1= 1;
}
return;
}
if (result == -1 && error == EINTR)
{
/* Never mind. */
return;
}
if (result == 0)
{
msg("connection closed.");
done(0);
}
if (result < 0) {
fprintf(stderr, "rlogin: %s\n", strerror(error));
}
done(1);
}
static void
completed_wr_rem(result, error)
int result;
int error;
{
inprogress_wr_rem= 0;
if (result > 0)
{
if (extra_wr_rem != NULL)
{
assert (result <= extra_wr_rem_size);
extra_wr_rem_size -= result;
extra_wr_rem_offset += result;
if (extra_wr_rem_size == 0)
{
free(extra_wr_rem);
extra_wr_rem= NULL;
if (wr_rem_size == 0)
{
more2write_rem= 0;
more2read_0= 1;
}
}
return;
}
assert (result <= wr_rem_size);
wr_rem_size -= result;
wr_rem_offset += result;
if (wr_rem_size == 0)
{
more2write_rem= 0;
more2read_0= 1;
}
return;
}
if (result < 0) {
fprintf(stderr, "rlogin: %s\n", strerror(error));
}
done(1);
}
static void
do_urg(urg_byte)
int urg_byte;
{
#if DEBUG
fprintf(stderr, "rlogin: warning got urg_byte 0x%x\r\n", urg_byte);
#endif
if (urg_byte & TIOCPKT_WINDOW)
{
if (dosigwinch == 0)
{
sendwindow();
signal(SIGWINCH, sigwinch);
}
dosigwinch= 1;
}
}
static void
echo(c)
int c;
{
u_char c1;
char *new_buf;
new_buf= realloc(extra_1_new, extra_1_new_size+6);
if (new_buf == NULL)
return;
extra_1_new= new_buf;
new_buf= extra_1_new+extra_1_new_size;
c1= escapechar;
if (c1 < ' ')
{
*new_buf++= '^';
*new_buf++= c1 + '@';
}
else if (c1 == 0x7f)
{
*new_buf++= '^';
*new_buf++= '?';
}
else
*new_buf++= c1;
if (c < ' ')
{
*new_buf++= '^';
*new_buf++= c + '@';
}
else if (c == 0x7f)
{
*new_buf++= '^';
*new_buf++= '?';
}
else
*new_buf++= c;
*new_buf++= '\r';
*new_buf++= '\n';
extra_1_new_size= new_buf-extra_1_new;
more2write_1= 1;
}
static void
finish()
{
done(0);
}
static char cmdbuf[256];
static void
subshell()
{
/* Start a subshell. Based on the first character of the command,
* the tcp connection will be present at fd 3 ('+'), or at
* fd 0 and fd 1 ('=')
*/
int r, pid, stat, len;
char *shell, *cmd;
/* cancel the reads and writes that are in progress. */
if (inprogress_0)
{
r= fcancel(0, ASIO_READ);
if (r != 0) abort();
}
if (inprogress_1)
{
r= fcancel(1, ASIO_WRITE);
if (r != 0) abort();
}
if (inprogress_rd_rem)
{
r= fcancel(rem, ASIO_READ);
if (r != 0) abort();
}
if (inprogress_wr_rem)
{
r= fcancel(rem, ASIO_WRITE);
if (r != 0) abort();
}
mode(0);
pid= fork();
if (pid == -1) abort();
if (pid != 0)
{
r= waitpid(pid, &stat, 0);
if (r != pid) abort();
#if DEBUG
fprintf(stderr, "stat: 0x%x\n", stat);
#endif
mode(1);
return;
}
(void)signal(SIGINT, SIG_DFL);
shell= getenv("SHELL");
if (shell == NULL)
shell= "/bin/sh";
printf("~!\ncommand [%s]: ", shell);
cmd= fgets(cmdbuf, sizeof(cmdbuf), stdin);
if (cmd == NULL)
exit(0);
#if DEBUG
printf("got command '%s'\n", cmd);
#endif
/* Strip the trailing newline */
len= strlen(cmd);
if (len > 0 && cmd[len-1] == '\n')
cmd[len-1]= '\0';
else
printf("\n");
/* Skip leading white space */
while (*cmd != '\0' && isspace(*cmd))
cmd++;
if (*cmd == '+')
{
if (rem != 3)
{
dup2(rem, 3);
close(rem);
}
cmd++;
}
else if (*cmd == '=')
{
dup2(rem, 0);
dup2(rem, 1);
close(rem);
cmd++;
}
else
close(rem);
if (*cmd == '\0')
{
r= execl(shell, shell, NULL);
}
else
{
r= execl("/bin/sh", "sh", "-c", cmd, NULL);
}
printf("exec failed: %d, %d\n", r, errno);
exit(0);
}
#endif /* __minix_vmd */
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