1014 lines
21 KiB
C
1014 lines
21 KiB
C
/* $NetBSD: rlogin.c,v 1.35 2005/03/11 03:19:31 ginsbach Exp $ */
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/*
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* Copyright (c) 1983, 1990, 1993
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* The Regents of the University of California. All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. Neither the name of the University nor the names of its contributors
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* may be used to endorse or promote products derived from this software
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* without specific prior written permission.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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#ifndef lint
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__COPYRIGHT("@(#) Copyright (c) 1983, 1990, 1993\n\
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The Regents of the University of California. All rights reserved.\n");
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#endif /* not lint */
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#ifndef lint
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#if 0
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static char sccsid[] = "@(#)rlogin.c 8.4 (Berkeley) 4/29/95";
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#else
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__RCSID("$NetBSD: rlogin.c,v 1.35 2005/03/11 03:19:31 ginsbach Exp $");
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#endif
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#endif /* not lint */
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/*
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* rlogin - remote login
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*/
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#include <sys/param.h>
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/wait.h>
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#include <sys/ioctl.h>
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#include <netinet/in.h>
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#include <netinet/in_systm.h>
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#include <netinet/ip.h>
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#include <err.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <netdb.h>
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#include <pwd.h>
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#include <setjmp.h>
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#include <signal.h>
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#include <stdarg.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <termios.h>
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#include <unistd.h>
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#include "getport.h"
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#ifdef KERBEROS
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#include <kerberosIV/des.h>
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#include <kerberosIV/krb.h>
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#include <kerberosIV/kstream.h>
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#include "krb.h"
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CREDENTIALS cred;
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Key_schedule schedule;
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MSG_DAT msg_data;
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struct sockaddr_in local, foreign;
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int use_kerberos = 1, doencrypt;
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kstream krem;
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#endif
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#ifndef TIOCPKT_WINDOW
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#define TIOCPKT_WINDOW 0x80
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#endif
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/* concession to Sun */
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#ifndef SIGUSR1
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#define SIGUSR1 30
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#endif
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#ifndef CCEQ
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#define CCEQ(val, c) (c == val ? val != _POSIX_VDISABLE : 0)
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#endif
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int eight, rem;
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struct termios deftty;
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int noescape;
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u_char escapechar = '~';
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#ifdef OLDSUN
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struct winsize {
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unsigned short ws_row, ws_col;
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unsigned short ws_xpixel, ws_ypixel;
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};
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#else
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#define get_window_size(fd, wp) ioctl(fd, TIOCGWINSZ, wp)
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#endif
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struct winsize winsize;
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void catch_child(int);
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void copytochild(int);
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void doit(sigset_t *);
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void done(int);
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void echo(int);
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u_int getescape(char *);
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void lostpeer(int);
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int main(int, char **);
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void mode(int);
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void msg(const char *);
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void oob(int);
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int reader(sigset_t *);
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void sendwindow(void);
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void setsignal(int);
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void sigwinch(int);
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void stop(int);
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void usage(void);
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void writer(void);
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void writeroob(int);
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#ifdef KERBEROS
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void warning(const char *, ...);
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#endif
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#ifdef OLDSUN
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int get_window_size(int, struct winsize *);
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#endif
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int
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main(int argc, char *argv[])
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{
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struct passwd *pw;
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struct servent *sp;
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struct termios tty;
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sigset_t smask;
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uid_t uid;
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int argoff, ch, dflag, one;
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int i, len, len2;
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int family = AF_UNSPEC;
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char *host, *p, *user, *name, term[1024] = "network";
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speed_t ospeed;
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struct sigaction sa;
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char *service = NULL;
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struct rlimit rlim;
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#ifdef KERBEROS
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KTEXT_ST ticket;
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int sock;
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long authopts;
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int through_once = 0;
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extern int _kstream_des_debug_OOB;
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char *dest_realm = NULL;
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#endif
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argoff = dflag = 0;
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one = 1;
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host = user = NULL;
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sp = NULL;
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if (strcmp(getprogname(), "rlogin") != 0) {
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host = strdup(getprogname());
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if (host == NULL)
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err(1, NULL);
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}
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/* handle "rlogin host flags" */
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if (!host && argc > 2 && argv[1][0] != '-') {
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host = argv[1];
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argoff = 1;
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}
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#ifdef KERBEROS
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#define OPTIONS "468EKde:p:k:l:x"
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#else
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#define OPTIONS "468EKde:p:l:"
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#endif
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while ((ch = getopt(argc - argoff, argv + argoff, OPTIONS)) != -1)
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switch(ch) {
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case '4':
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family = AF_INET;
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break;
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case '6':
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family = AF_INET6;
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break;
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case '8':
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eight = 1;
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break;
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case 'E':
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noescape = 1;
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break;
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#ifdef KERBEROS
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case 'K':
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use_kerberos = 0;
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break;
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#endif
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case 'd':
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#ifdef KERBEROS
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_kstream_des_debug_OOB = 1;
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#endif
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dflag = 1;
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break;
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case 'e':
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noescape = 0;
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escapechar = getescape(optarg);
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break;
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#ifdef KERBEROS
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case 'k':
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dest_realm = optarg;
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break;
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#endif
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case 'l':
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user = optarg;
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break;
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case 'p':
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sp = getport(service = optarg, "tcp");
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break;
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#ifdef CRYPT
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#ifdef KERBEROS
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case 'x':
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doencrypt = 1;
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break;
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#endif
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#endif
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case '?':
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default:
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usage();
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}
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optind += argoff;
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argc -= optind;
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argv += optind;
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/* if haven't gotten a host yet, do so */
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if (!host && !(host = *argv++))
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usage();
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if (*argv)
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usage();
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if (!(pw = getpwuid(uid = getuid())))
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errx(1, "unknown user id.");
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/* Accept user1@host format, though "-l user2" overrides user1 */
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p = strchr(host, '@');
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if (p) {
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*p = '\0';
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if (!user && p > host)
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user = host;
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host = p + 1;
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if (*host == '\0')
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usage();
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}
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if ((name = strdup(pw->pw_name)) == NULL)
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err(1, "malloc");
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if (!user)
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user = name;
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#ifdef KERBEROS
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if (use_kerberos) {
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if (sp == NULL) {
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sp = getservbyname((doencrypt ? "eklogin" : "klogin"), "tcp");
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}
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if (sp == NULL) {
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use_kerberos = 0;
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warning("can't get entry for %s/tcp service",
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doencrypt ? "eklogin" : "klogin");
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}
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}
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#endif
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if (sp == NULL)
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sp = getservbyname("login", "tcp");
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if (sp == NULL)
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errx(1, "login/tcp: unknown service.");
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if ((p = getenv("TERM")) != NULL)
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(void)strlcpy(term, p, sizeof(term));
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len = strlen(term);
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if (len < (sizeof(term) - 1) && tcgetattr(0, &tty) == 0) {
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/* start at 2 to include the / */
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for (ospeed = i = cfgetospeed(&tty), len2 = 2; i > 9; len2++)
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i /= 10;
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if (len + len2 < sizeof(term))
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(void)snprintf(term + len, len2 + 1, "/%d", ospeed);
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}
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(void)get_window_size(0, &winsize);
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sa.sa_handler = lostpeer;
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(void)sigaction(SIGPIPE, &sa, (struct sigaction *)0);
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/* will use SIGUSR1 for window size hack, so hold it off */
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sigemptyset(&smask);
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sigaddset(&smask, SIGURG);
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sigaddset(&smask, SIGUSR1);
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(void)sigprocmask(SIG_SETMASK, &smask, &smask);
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/*
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* We set SIGURG and SIGUSR1 below so that an
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* incoming signal will be held pending rather than being
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* discarded. Note that these routines will be ready to get
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* a signal by the time that they are unblocked below.
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*/
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sa.sa_handler = copytochild;
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(void)sigaction(SIGURG, &sa, (struct sigaction *) 0);
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sa.sa_handler = writeroob;
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(void)sigaction(SIGUSR1, &sa, (struct sigaction *) 0);
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/* don't dump core */
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rlim.rlim_cur = rlim.rlim_max = 0;
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if (setrlimit(RLIMIT_CORE, &rlim) < 0)
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warn("setrlimit");
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#ifdef KERBEROS
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try_connect:
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if (use_kerberos) {
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struct hostent *hp;
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/* Fully qualify hostname (needed for krb_realmofhost). */
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hp = gethostbyname(host);
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if (hp != NULL && !(host = strdup(hp->h_name)))
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errx(1, "%s", strerror(ENOMEM));
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rem = KSUCCESS;
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errno = 0;
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#ifdef CRYPT
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if (doencrypt)
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authopts = KOPT_DO_MUTUAL;
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else
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#endif /* CRYPT */
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authopts = 0L;
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if (dest_realm == NULL) {
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/* default this now, once. */
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if (!(dest_realm = krb_realmofhost (host))) {
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warnx("Unknown realm for host %s.", host);
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use_kerberos = 0;
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if (service != NULL)
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sp = getservbyname("login", "tcp");
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goto try_connect;
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}
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}
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rem = kcmd(&sock, &host, sp->s_port, name, user,
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term, 0, &ticket, "rcmd", dest_realm,
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&cred, schedule, &msg_data, &local, &foreign,
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authopts);
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if (rem != KSUCCESS) {
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switch(rem) {
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case KDC_PR_UNKNOWN:
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warnx("Host %s not registered for %s",
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host, "Kerberos rlogin service");
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use_kerberos = 0;
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if (service != NULL)
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sp = getservbyname("login", "tcp");
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goto try_connect;
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case NO_TKT_FIL:
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if (through_once++) {
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use_kerberos = 0;
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if (service != NULL)
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sp = getservbyname("login", "tcp");
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goto try_connect;
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}
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#ifdef notyet
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krb_get_pw_in_tkt(user, krb_realm, "krbtgt",
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krb_realm,
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DEFAULT_TKT_LIFE/5, 0);
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goto try_connect;
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#endif
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default:
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warnx("Kerberos rcmd failed: %s",
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(rem == -1) ? "rcmd protocol failure" :
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krb_err_txt[rem]);
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use_kerberos = 0;
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if (service != NULL)
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sp = getservbyname("login", "tcp");
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goto try_connect;
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}
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}
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rem = sock;
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if (doencrypt)
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krem = kstream_create_rlogin_from_fd(rem, &schedule,
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&cred.session);
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else
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krem = kstream_create_from_fd(rem, 0, 0);
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kstream_set_buffer_mode(krem, 0);
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} else {
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#ifdef CRYPT
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if (doencrypt)
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errx(1, "the -x flag requires Kerberos authentication.");
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#endif /* CRYPT */
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rem = rcmd_af(&host, sp->s_port, name, user, term, 0, family);
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if (rem < 0)
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exit(1);
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}
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#else
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rem = rcmd_af(&host, sp->s_port, name, user, term, 0, family);
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#endif /* KERBEROS */
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if (rem < 0)
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exit(1);
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if (dflag &&
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setsockopt(rem, SOL_SOCKET, SO_DEBUG, &one, sizeof(one)) < 0)
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warn("setsockopt DEBUG (ignored)");
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{
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struct sockaddr_storage ss;
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int sslen;
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sslen = sizeof(ss);
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if (getsockname(rem, (struct sockaddr *)&ss, &sslen) == 0
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&& ((struct sockaddr *)&ss)->sa_family == AF_INET) {
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one = IPTOS_LOWDELAY;
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if (setsockopt(rem, IPPROTO_IP, IP_TOS, (char *)&one,
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sizeof(int)) < 0) {
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warn("setsockopt TOS (ignored)");
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}
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}
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}
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(void)setuid(uid);
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doit(&smask);
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/*NOTREACHED*/
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return (0);
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}
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pid_t child;
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void
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doit(sigset_t *smask)
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{
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struct sigaction sa;
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sigemptyset(&sa.sa_mask);
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sa.sa_flags = SA_RESTART;
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sa.sa_handler = SIG_IGN;
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(void)sigaction(SIGINT, &sa, (struct sigaction *) 0);
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setsignal(SIGHUP);
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setsignal(SIGQUIT);
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mode(1);
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child = fork();
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if (child == -1) {
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warn("fork");
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done(1);
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}
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if (child == 0) {
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mode(1);
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if (reader(smask) == 0) {
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msg("connection closed.");
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exit(0);
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}
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sleep(1);
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msg("\aconnection closed.");
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exit(1);
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}
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|
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/*
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* We may still own the socket, and may have a pending SIGURG (or might
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* receive one soon) that we really want to send to the reader. When
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* one of these comes in, the trap copytochild simply copies such
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* signals to the child. We can now unblock SIGURG and SIGUSR1
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* that were set above.
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*/
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(void)sigprocmask(SIG_SETMASK, smask, (sigset_t *) 0);
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sa.sa_handler = catch_child;
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(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
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writer();
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msg("closed connection.");
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done(0);
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}
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|
|
/* trap a signal, unless it is being ignored. */
|
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void
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setsignal(int sig)
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{
|
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struct sigaction sa;
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sigset_t sigs;
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|
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sigemptyset(&sigs);
|
|
sigaddset(&sigs, sig);
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sigprocmask(SIG_BLOCK, &sigs, &sigs);
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|
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sigemptyset(&sa.sa_mask);
|
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sa.sa_handler = exit;
|
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sa.sa_flags = SA_RESTART;
|
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(void)sigaction(sig, &sa, &sa);
|
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if (sa.sa_handler == SIG_IGN)
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(void)sigaction(sig, &sa, (struct sigaction *) 0);
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|
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(void)sigprocmask(SIG_SETMASK, &sigs, (sigset_t *) 0);
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}
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|
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void
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done(int status)
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{
|
|
pid_t w;
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int wstatus;
|
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struct sigaction sa;
|
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|
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mode(0);
|
|
if (child > 0) {
|
|
/* make sure catch_child does not snap it up */
|
|
sigemptyset(&sa.sa_mask);
|
|
sa.sa_handler = SIG_DFL;
|
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sa.sa_flags = 0;
|
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(void)sigaction(SIGCHLD, &sa, (struct sigaction *) 0);
|
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if (kill(child, SIGKILL) >= 0)
|
|
while ((w = wait(&wstatus)) > 0 && w != child)
|
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continue;
|
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}
|
|
exit(status);
|
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}
|
|
|
|
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(const 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
|
|
"468EKdx", " [-k realm] ");
|
|
#else
|
|
"468EKd", " [-k realm] ");
|
|
#endif
|
|
#else
|
|
"468Ed", " ");
|
|
#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);
|
|
}
|