629 lines
15 KiB
C
629 lines
15 KiB
C
/* tli.c
|
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Code to handle TLI connections.
|
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|
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Copyright (C) 1992, 1993, 1994 Ian Lance Taylor
|
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This file is part of the Taylor UUCP package.
|
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|
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This program is free software; you can redistribute it and/or
|
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modify it under the terms of the GNU General Public License as
|
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published by the Free Software Foundation; either version 2 of the
|
||
License, or (at your option) any later version.
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||
|
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This program is distributed in the hope that it will be useful, but
|
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WITHOUT ANY WARRANTY; without even the implied warranty of
|
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||
General Public License for more details.
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You should have received a copy of the GNU General Public License
|
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along with this program; if not, write to the Free Software
|
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Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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The author of the program may be contacted at ian@airs.com or
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c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
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*/
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#include "uucp.h"
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#if USE_RCS_ID
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const char tli_rcsid[] = "$Id: tli.c,v 1.1 1995/08/24 05:20:25 jtc Exp $";
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#endif
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#if HAVE_TLI
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#include "sysdep.h"
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#include "uudefs.h"
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#include "uuconf.h"
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#include "conn.h"
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#include "system.h"
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#include <errno.h>
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#if HAVE_SYS_IOCTL_H
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#include <sys/ioctl.h>
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#endif
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#if HAVE_TIUSER_H
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#include <tiuser.h>
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#else
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#if HAVE_XTI_H
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#include <xti.h>
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#else
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#if HAVE_SYS_TLI_H
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#include <sys/tli.h>
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#endif
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#endif
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#endif
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#if HAVE_STROPTS_H
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#include <stropts.h>
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#endif
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#if HAVE_FCNTL_H
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#include <fcntl.h>
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#else
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#if HAVE_SYS_FILE_H
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#include <sys/file.h>
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#endif
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#endif
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#ifndef O_RDONLY
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#define O_RDONLY 0
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#define O_WRONLY 1
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#define O_RDWR 2
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#endif
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#ifndef FD_CLOEXEC
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#define FD_CLOEXEC 1
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#endif
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/* The arguments to t_alloca have two different names. I want the
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SVID ones, not the XPG3 ones. */
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#ifndef T_BIND
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#define T_BIND T_BIND_STR
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#endif
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#ifndef T_CALL
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#define T_CALL T_CALL_STR
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#endif
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/* Hopefully these externs will not cause any trouble. This is how
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they are shown in the SVID. */
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extern int t_errno;
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extern char *t_errlist[];
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extern int t_nerr;
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#ifndef HAVE_TIUSER_H
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#ifndef t_alloc
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extern pointer t_alloc ();
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#endif
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#endif
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/* This code handles TLI connections. It's Unix specific. It's
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largely based on code from Unix Network Programming, by W. Richard
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Stevens. */
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/* Local functions. */
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static const char *ztlierror P((void));
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static void utli_free P((struct sconnection *qconn));
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static boolean ftli_push P((struct sconnection *qconn));
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static boolean ftli_open P((struct sconnection *qconn, long ibaud,
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boolean fwait));
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static boolean ftli_close P((struct sconnection *qconn,
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pointer puuconf,
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struct uuconf_dialer *qdialer,
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boolean fsuccess));
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static boolean ftli_dial P((struct sconnection *qconn, pointer puuconf,
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const struct uuconf_system *qsys,
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const char *zphone,
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struct uuconf_dialer *qdialer,
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enum tdialerfound *ptdialer));
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/* The command table for a TLI connection. */
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static const struct sconncmds stlicmds =
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{
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utli_free,
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NULL, /* pflock */
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NULL, /* pfunlock */
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ftli_open,
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ftli_close,
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ftli_dial,
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fsysdep_conn_read,
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fsysdep_conn_write,
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fsysdep_conn_io,
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NULL, /* pfbreak */
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NULL, /* pfset */
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NULL, /* pfcarrier */
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fsysdep_conn_chat,
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NULL /* pibaud */
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};
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/* Get a TLI error string. */
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static const char *
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ztlierror ()
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{
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if (t_errno == TSYSERR)
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return strerror (errno);
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if (t_errno < 0 || t_errno >= t_nerr)
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return "Unknown TLI error";
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return t_errlist[t_errno];
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}
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/* Initialize a TLI connection. This may be called with qconn->qport
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NULL, when opening standard input as a TLI connection. */
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boolean
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fsysdep_tli_init (qconn)
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struct sconnection *qconn;
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{
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struct ssysdep_conn *q;
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q = (struct ssysdep_conn *) xmalloc (sizeof (struct ssysdep_conn));
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q->o = -1;
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q->ord = -1;
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q->owr = -1;
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q->zdevice = NULL;
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q->iflags = -1;
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q->iwr_flags = -1;
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q->fterminal = FALSE;
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q->ftli = TRUE;
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q->ibaud = 0;
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qconn->psysdep = (pointer) q;
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qconn->qcmds = &stlicmds;
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return TRUE;
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}
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/* Free a TLI connection. */
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static void
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utli_free (qconn)
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struct sconnection *qconn;
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{
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xfree (qconn->psysdep);
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}
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/* Push all desired modules onto a TLI stream. If the user requests a
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STREAMS connection without giving a list of modules, we just push
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tirdwr. If the I_PUSH ioctl is not defined on this system, we just
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ignore any list of modules. */
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static boolean
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ftli_push (qconn)
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struct sconnection *qconn;
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{
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#ifdef I_PUSH
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struct ssysdep_conn *qsysdep;
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qsysdep = (struct ssysdep_conn *) qconn->psysdep;
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if (qconn->qport->uuconf_u.uuconf_stli.uuconf_pzpush != NULL)
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{
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char **pz;
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for (pz = qconn->qport->uuconf_u.uuconf_stli.uuconf_pzpush;
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*pz != NULL;
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pz++)
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{
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if (ioctl (qsysdep->o, I_PUSH, *pz) < 0)
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{
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ulog (LOG_ERROR, "ioctl (I_PUSH, %s): %s", *pz,
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strerror (errno));
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return FALSE;
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}
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}
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}
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else if (qconn->qport->uuconf_u.uuconf_stli.uuconf_fstream)
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{
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if (ioctl (qsysdep->o, I_PUSH, "tirdwr") < 0)
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{
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ulog (LOG_ERROR, "ioctl (I_PUSH, tirdwr): %s",
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strerror (errno));
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return FALSE;
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}
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}
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/* If we have just put the connection into stream mode, we must turn
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off the TLI flag to avoid using TLI calls on it. */
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if (qconn->qport->uuconf_u.uuconf_stli.uuconf_fstream)
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qsysdep->ftli = FALSE;
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#endif /* defined (I_PUSH) */
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return TRUE;
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}
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/* Open a TLI connection. If the fwait argument is TRUE, we are
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running as a server. Otherwise we are just trying to reach another
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system. */
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static boolean
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ftli_open (qconn, ibaud, fwait)
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struct sconnection *qconn;
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long ibaud;
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boolean fwait;
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{
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struct ssysdep_conn *qsysdep;
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const char *zdevice;
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char *zfreedev;
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const char *zservaddr;
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char *zfreeaddr;
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uid_t ieuid;
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boolean fswap;
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struct t_bind *qtbind;
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struct t_call *qtcall;
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/* Unlike most other device types, we don't bother to call
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ulog_device here, because fconn_open calls it with the name of
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the port anyhow. */
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qsysdep = (struct ssysdep_conn *) qconn->psysdep;
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zdevice = qconn->qport->uuconf_u.uuconf_stli.uuconf_zdevice;
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if (zdevice == NULL)
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zdevice = qconn->qport->uuconf_zname;
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zfreedev = NULL;
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if (*zdevice != '/')
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{
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zfreedev = zbufalc (sizeof "/dev/" + strlen (zdevice));
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sprintf (zfreedev, "/dev/%s", zdevice);
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zdevice = zfreedev;
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}
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/* If we are acting as a server, swap to our real user ID before
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calling t_open. This will permit the server to use privileged
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TCP ports when invoked by root. We only swap if our effective
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user ID is not root, so that the program can also be made suid
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root in order to get privileged ports when invoked by anybody. */
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fswap = fwait && geteuid () != 0;
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if (fswap)
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{
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if (! fsuser_perms (&ieuid))
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{
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ubuffree (zfreedev);
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return FALSE;
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}
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}
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qsysdep->o = t_open (zdevice, O_RDWR, (struct t_info *) NULL);
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if (qsysdep->o < 0)
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{
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if (fswap)
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(void) fsuucp_perms ((long) ieuid);
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ulog (LOG_ERROR, "t_open (%s): %s", zdevice, ztlierror ());
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ubuffree (zfreedev);
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return FALSE;
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}
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if (fcntl (qsysdep->o, F_SETFD,
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fcntl (qsysdep->o, F_GETFD, 0) | FD_CLOEXEC) < 0)
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{
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if (fswap)
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(void) fsuucp_perms ((long) ieuid);
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ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
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ubuffree (zfreedev);
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(void) t_close (qsysdep->o);
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qsysdep->o = -1;
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return FALSE;
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}
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qsysdep->iflags = fcntl (qsysdep->o, F_GETFL, 0);
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if (qsysdep->iflags < 0)
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{
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if (fswap)
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(void) fsuucp_perms ((long) ieuid);
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ulog (LOG_ERROR, "fcntl: %s", strerror (errno));
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ubuffree (zfreedev);
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(void) t_close (qsysdep->o);
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qsysdep->o = -1;
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return FALSE;
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}
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/* We save our process ID in the qconn structure. This is checked
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in ftli_close. */
|
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qsysdep->ipid = getpid ();
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/* If we aren't waiting for a connection, we can bind to any local
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address, and then we're finished. */
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if (! fwait)
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{
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/* fswap is known to be FALSE here. */
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ubuffree (zfreedev);
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if (t_bind (qsysdep->o, (struct t_bind *) NULL,
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(struct t_bind *) NULL) < 0)
|
||
{
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||
ulog (LOG_ERROR, "t_bind: %s", ztlierror ());
|
||
(void) t_close (qsysdep->o);
|
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qsysdep->o = -1;
|
||
return FALSE;
|
||
}
|
||
return TRUE;
|
||
}
|
||
|
||
/* Run as a server and wait for a new connection. The code in
|
||
uucico.c has already detached us from our controlling terminal.
|
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From this point on if the server gets an error we exit; we only
|
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return if we have received a connection. It would be more robust
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to respawn the server if it fails; someday. */
|
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qtbind = (struct t_bind *) t_alloc (qsysdep->o, T_BIND, T_ALL);
|
||
if (qtbind == NULL)
|
||
{
|
||
if (fswap)
|
||
(void) fsuucp_perms ((long) ieuid);
|
||
ulog (LOG_FATAL, "t_alloc (T_BIND): %s", ztlierror ());
|
||
}
|
||
|
||
zservaddr = qconn->qport->uuconf_u.uuconf_stli.uuconf_zservaddr;
|
||
if (zservaddr == NULL)
|
||
{
|
||
if (fswap)
|
||
(void) fsuucp_perms ((long) ieuid);
|
||
ulog (LOG_FATAL, "Can't run as TLI server; no server address");
|
||
}
|
||
|
||
zfreeaddr = zbufcpy (zservaddr);
|
||
qtbind->addr.len = cescape (zfreeaddr);
|
||
if (qtbind->addr.len > qtbind->addr.maxlen)
|
||
{
|
||
if (fswap)
|
||
(void) fsuucp_perms ((long) ieuid);
|
||
ulog (LOG_FATAL, "%s: TLI server address too long (max %d)",
|
||
zservaddr, qtbind->addr.maxlen);
|
||
}
|
||
memcpy (qtbind->addr.buf, zfreeaddr, qtbind->addr.len);
|
||
ubuffree (zfreeaddr);
|
||
|
||
qtbind->qlen = 5;
|
||
|
||
if (t_bind (qsysdep->o, qtbind, (struct t_bind *) NULL) < 0)
|
||
{
|
||
if (fswap)
|
||
(void) fsuucp_perms ((long) ieuid);
|
||
ulog (LOG_FATAL, "t_bind (%s): %s", zservaddr, ztlierror ());
|
||
}
|
||
|
||
if (fswap)
|
||
{
|
||
if (! fsuucp_perms ((long) ieuid))
|
||
ulog (LOG_FATAL, "Could not swap back to UUCP user permissions");
|
||
}
|
||
|
||
(void) t_free ((pointer) qtbind, T_BIND);
|
||
|
||
qtcall = (struct t_call *) t_alloc (qsysdep->o, T_CALL, T_ALL);
|
||
if (qtcall == NULL)
|
||
ulog (LOG_FATAL, "t_alloc (T_CALL): %s", ztlierror ());
|
||
|
||
while (! FGOT_SIGNAL ())
|
||
{
|
||
int onew;
|
||
pid_t ipid;
|
||
|
||
DEBUG_MESSAGE0 (DEBUG_PORT,
|
||
"ftli_open: Waiting for connections");
|
||
|
||
if (t_listen (qsysdep->o, qtcall) < 0)
|
||
ulog (LOG_FATAL, "t_listen: %s", ztlierror ());
|
||
|
||
onew = t_open (zdevice, O_RDWR, (struct t_info *) NULL);
|
||
if (onew < 0)
|
||
ulog (LOG_FATAL, "t_open (%s): %s", zdevice, ztlierror ());
|
||
|
||
if (fcntl (onew, F_SETFD,
|
||
fcntl (onew, F_GETFD, 0) | FD_CLOEXEC) < 0)
|
||
ulog (LOG_FATAL, "fcntl (FD_CLOEXEC): %s", strerror (errno));
|
||
|
||
if (t_bind (onew, (struct t_bind *) NULL, (struct t_bind *) NULL) < 0)
|
||
ulog (LOG_FATAL, "t_bind: %s", ztlierror ());
|
||
|
||
if (t_accept (qsysdep->o, onew, qtcall) < 0)
|
||
{
|
||
/* We may have received a disconnect. */
|
||
if (t_errno != TLOOK)
|
||
ulog (LOG_FATAL, "t_accept: %s", ztlierror ());
|
||
if (t_rcvdis (qsysdep->o, (struct t_discon *) NULL) < 0)
|
||
ulog (LOG_FATAL, "t_rcvdis: %s", ztlierror ());
|
||
(void) t_close (onew);
|
||
continue;
|
||
}
|
||
|
||
DEBUG_MESSAGE0 (DEBUG_PORT,
|
||
"ftli_open: Got connection; forking");
|
||
|
||
ipid = ixsfork ();
|
||
if (ipid < 0)
|
||
ulog (LOG_FATAL, "fork: %s", strerror (errno));
|
||
if (ipid == 0)
|
||
{
|
||
ulog_close ();
|
||
|
||
(void) t_close (qsysdep->o);
|
||
qsysdep->o = onew;
|
||
|
||
/* Push any desired modules. */
|
||
if (! ftli_push (qconn))
|
||
_exit (EXIT_FAILURE);
|
||
|
||
/* Now we fork and let our parent die, so that we become
|
||
a child of init. This lets the main server code wait
|
||
for its child and then continue without accumulating
|
||
zombie children. */
|
||
ipid = ixsfork ();
|
||
if (ipid < 0)
|
||
{
|
||
ulog (LOG_ERROR, "fork: %s", strerror (errno));
|
||
_exit (EXIT_FAILURE);
|
||
}
|
||
|
||
if (ipid != 0)
|
||
_exit (EXIT_SUCCESS);
|
||
|
||
ulog_id (getpid ());
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
(void) t_close (onew);
|
||
|
||
/* Now wait for the child. */
|
||
(void) ixswait ((unsigned long) ipid, (const char *) NULL);
|
||
}
|
||
|
||
/* We got a signal. */
|
||
usysdep_exit (FALSE);
|
||
|
||
/* Avoid compiler warnings. */
|
||
return FALSE;
|
||
}
|
||
|
||
/* Close the port. */
|
||
|
||
/*ARGSUSED*/
|
||
static boolean
|
||
ftli_close (qconn, puuconf, qdialer, fsuccess)
|
||
struct sconnection *qconn;
|
||
pointer puuconf;
|
||
struct uuconf_dialer *qdialer;
|
||
boolean fsuccess;
|
||
{
|
||
struct ssysdep_conn *qsysdep;
|
||
boolean fret;
|
||
|
||
qsysdep = (struct ssysdep_conn *) qconn->psysdep;
|
||
|
||
fret = TRUE;
|
||
if (qsysdep->o >= 0)
|
||
{
|
||
if (qsysdep->ftli)
|
||
{
|
||
if (t_close (qsysdep->o) < 0)
|
||
{
|
||
ulog (LOG_ERROR, "t_close: %s", ztlierror ());
|
||
fret = FALSE;
|
||
}
|
||
}
|
||
else
|
||
{
|
||
if (close (qsysdep->o) < 0)
|
||
{
|
||
ulog (LOG_ERROR, "close: %s", strerror (errno));
|
||
fret = FALSE;
|
||
}
|
||
}
|
||
|
||
qsysdep->o = -1;
|
||
}
|
||
|
||
/* If the current pid is not the one we used to open the port, then
|
||
we must have forked up above and we are now the child. In this
|
||
case, we are being called from within the fendless loop in
|
||
uucico.c. We return FALSE to force the loop to end and the child
|
||
to exit. This should be handled in a cleaner fashion. */
|
||
if (qsysdep->ipid != getpid ())
|
||
fret = FALSE;
|
||
|
||
return fret;
|
||
}
|
||
|
||
/* Dial out on a TLI port, so to speak: connect to a remote computer. */
|
||
|
||
/*ARGSUSED*/
|
||
static boolean
|
||
ftli_dial (qconn, puuconf, qsys, zphone, qdialer, ptdialerfound)
|
||
struct sconnection *qconn;
|
||
pointer puuconf;
|
||
const struct uuconf_system *qsys;
|
||
const char *zphone;
|
||
struct uuconf_dialer *qdialer;
|
||
enum tdialerfound *ptdialerfound;
|
||
{
|
||
struct ssysdep_conn *qsysdep;
|
||
char **pzdialer;
|
||
const char *zaddr;
|
||
struct t_call *qtcall;
|
||
char *zescape;
|
||
|
||
qsysdep = (struct ssysdep_conn *) qconn->psysdep;
|
||
|
||
*ptdialerfound = DIALERFOUND_FALSE;
|
||
|
||
pzdialer = qconn->qport->uuconf_u.uuconf_stli.uuconf_pzdialer;
|
||
if (*pzdialer == NULL)
|
||
pzdialer = NULL;
|
||
|
||
/* If the first dialer is "TLI" or "TLIS", we use the first token
|
||
(pzdialer[1]) as the address to connect to. */
|
||
zaddr = zphone;
|
||
if (pzdialer != NULL
|
||
&& (strcmp (pzdialer[0], "TLI") == 0
|
||
|| strcmp (pzdialer[0], "TLIS") == 0))
|
||
{
|
||
if (pzdialer[1] == NULL)
|
||
++pzdialer;
|
||
else
|
||
{
|
||
if (strcmp (pzdialer[1], "\\D") != 0
|
||
&& strcmp (pzdialer[1], "\\T") != 0)
|
||
zaddr = pzdialer[1];
|
||
pzdialer += 2;
|
||
}
|
||
}
|
||
|
||
if (zaddr == NULL)
|
||
{
|
||
ulog (LOG_ERROR, "No address for TLI connection");
|
||
return FALSE;
|
||
}
|
||
|
||
qtcall = (struct t_call *) t_alloc (qsysdep->o, T_CALL, T_ADDR);
|
||
if (qtcall == NULL)
|
||
{
|
||
ulog (LOG_ERROR, "t_alloc (T_CALL): %s", ztlierror ());
|
||
return FALSE;
|
||
}
|
||
|
||
zescape = zbufcpy (zaddr);
|
||
qtcall->addr.len = cescape (zescape);
|
||
if (qtcall->addr.len > qtcall->addr.maxlen)
|
||
{
|
||
ulog (LOG_ERROR, "%s: TLI address too long (max %d)", zaddr,
|
||
qtcall->addr.maxlen);
|
||
ubuffree (zescape);
|
||
return FALSE;
|
||
}
|
||
memcpy (qtcall->addr.buf, zescape, qtcall->addr.len);
|
||
ubuffree (zescape);
|
||
|
||
if (t_connect (qsysdep->o, qtcall, (struct t_call *) NULL) < 0)
|
||
{
|
||
if (t_errno != TLOOK)
|
||
ulog (LOG_ERROR, "t_connect: %s", ztlierror ());
|
||
else
|
||
{
|
||
if (t_rcvdis (qsysdep->o, (struct t_discon *) NULL) < 0)
|
||
ulog (LOG_ERROR, "t_rcvdis: %s", ztlierror ());
|
||
else
|
||
ulog (LOG_ERROR, "Connection refused");
|
||
}
|
||
return FALSE;
|
||
}
|
||
|
||
/* We've connected to the remote. Push any desired modules. */
|
||
if (! ftli_push (qconn))
|
||
return FALSE;
|
||
|
||
/* Handle the rest of the dialer sequence. */
|
||
if (pzdialer != NULL && *pzdialer != NULL)
|
||
{
|
||
if (! fconn_dial_sequence (qconn, puuconf, pzdialer, qsys, zphone,
|
||
qdialer, ptdialerfound))
|
||
return FALSE;
|
||
}
|
||
|
||
return TRUE;
|
||
}
|
||
|
||
#endif /* HAVE_TLI */
|