freebsd-dev/gnu/libexec/uucp/libunix/xqtsub.c
1995-08-19 21:30:30 +00:00

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/* xqtsub.c
System dependent functions used only by uuxqt.
Copyright (C) 1991, 1992, 1993, 1995 Ian Lance Taylor
This file is part of the Taylor UUCP package.
This program is free software; you can redistribute it and/or
modify it under the terms of the GNU General Public License as
published by the Free Software Foundation; either version 2 of the
License, or (at your option) any later version.
This program is distributed in the hope that it will be useful, but
WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
The author of the program may be contacted at ian@airs.com or
c/o Cygnus Support, 48 Grove Street, Somerville, MA 02144.
*/
#include "uucp.h"
#if USE_RCS_ID
const char xqtsub_rcsid[] = "$Id: xqtsub.c,v 1.18 1995/06/21 20:21:14 ian Rel $";
#endif
#include "uudefs.h"
#include "uuconf.h"
#include "system.h"
#include "sysdep.h"
#include <ctype.h>
#include <errno.h>
#if HAVE_FCNTL_H
#include <fcntl.h>
#else
#if HAVE_SYS_FILE_H
#include <sys/file.h>
#endif
#endif
#ifndef O_RDONLY
#define O_RDONLY 0
#define O_WRONLY 1
#define O_RDWR 2
#endif
#ifndef O_NOCTTY
#define O_NOCTTY 0
#endif
#ifndef FD_CLOEXEC
#define FD_CLOEXEC 1
#endif
#if HAVE_OPENDIR
#if HAVE_DIRENT_H
#include <dirent.h>
#else /* ! HAVE_DIRENT_H */
#include <sys/dir.h>
#define dirent direct
#endif /* ! HAVE_DIRENT_H */
#endif /* HAVE_OPENDIR */
/* Get a value for EX_TEMPFAIL. */
#if HAVE_SYSEXITS_H
#include <sysexits.h>
#endif
#ifndef EX_TEMPFAIL
#define EX_TEMPFAIL 75
#endif
/* Get the full pathname of the command to execute, given the list of
permitted commands and the allowed path. */
char *
zsysdep_find_command (zcmd, pzcmds, pzpath, pferr)
const char *zcmd;
char **pzcmds;
char **pzpath;
boolean *pferr;
{
char **pz;
struct stat s;
*pferr = FALSE;
for (pz = pzcmds; *pz != NULL; pz++)
{
char *zslash;
if (strcmp (*pz, "ALL") == 0)
break;
zslash = strrchr (*pz, '/');
if (zslash != NULL)
++zslash;
else
zslash = *pz;
if (strcmp (zslash, zcmd) == 0
|| strcmp (*pz, zcmd) == 0)
{
/* If we already have an absolute path, we can get out
immediately. */
if (**pz == '/')
{
/* Quick error check. */
if (stat (*pz, &s) != 0)
{
ulog (LOG_ERROR, "%s: %s", *pz, strerror (errno));
*pferr = TRUE;
return NULL;
}
return zbufcpy (*pz);
}
break;
}
}
/* If we didn't find this command, get out. */
if (*pz == NULL)
return NULL;
/* We didn't find an absolute pathname, so we must look through
the path. */
for (pz = pzpath; *pz != NULL; pz++)
{
char *zname;
zname = zsysdep_in_dir (*pz, zcmd);
if (stat (zname, &s) == 0)
return zname;
}
return NULL;
}
/* Expand a local filename for uuxqt. This is special because uuxqt
only wants to expand filenames that start with ~ (it does not want
to prepend the current directory to other names) and if the ~ is
double, it is turned into a single ~. This returns NULL to
indicate that no change was required; it has no way to return
error. */
char *
zsysdep_xqt_local_file (qsys, zfile)
const struct uuconf_system *qsys;
const char *zfile;
{
if (*zfile != '~')
return NULL;
if (zfile[1] == '~')
{
size_t clen;
char *zret;
clen = strlen (zfile);
zret = zbufalc (clen);
memcpy (zret, zfile + 1, clen);
return zret;
}
return zsysdep_local_file (zfile, qsys->uuconf_zpubdir,
(boolean *) NULL);
}
#if ! ALLOW_FILENAME_ARGUMENTS
/* Check to see whether an argument specifies a file name; if it does,
make sure that the file may legally be sent and/or received. For
Unix, we do not permit any occurrence of "/../" in the name, nor
may it start with "../". Otherwise, if it starts with "/" we check
against the list of permitted files. */
boolean
fsysdep_xqt_check_file (qsys, zfile)
const struct uuconf_system *qsys;
const char *zfile;
{
size_t clen;
/* Disallow exact "..", prefix "../", suffix "/..", internal "/../",
and restricted absolute paths. */
clen = strlen (zfile);
if ((clen == sizeof ".." - 1
&& strcmp (zfile, "..") == 0)
|| strncmp (zfile, "../", sizeof "../" - 1) == 0
|| (clen >= sizeof "/.." - 1
&& strcmp (zfile + clen - (sizeof "/.." - 1), "/..") == 0)
|| strstr (zfile, "/../") != NULL
|| (*zfile == '/'
&& (! fin_directory_list (zfile, qsys->uuconf_pzremote_send,
qsys->uuconf_zpubdir, TRUE, FALSE,
(const char *) NULL)
|| ! fin_directory_list (zfile, qsys->uuconf_pzremote_receive,
qsys->uuconf_zpubdir, TRUE, FALSE,
(const char *) NULL))))
{
ulog (LOG_ERROR, "Not permitted to refer to file \"%s\"", zfile);
return FALSE;
}
return TRUE;
}
#endif /* ! ALLOW_FILENAME_ARGUMENTS */
/* Invoke the command specified by an execute file. */
/*ARGSUSED*/
boolean
fsysdep_execute (qsys, zuser, pazargs, zfullcmd, zinput, zoutput,
fshell, iseq, pzerror, pftemp)
const struct uuconf_system *qsys;
const char *zuser;
const char **pazargs;
const char *zfullcmd;
const char *zinput;
const char *zoutput;
boolean fshell;
int iseq;
char **pzerror;
boolean *pftemp;
{
int aidescs[3];
boolean ferr;
pid_t ipid;
int ierr;
char abxqtdir[sizeof XQTDIR + 4];
const char *zxqtdir;
int istat;
char *zpath;
#if ALLOW_SH_EXECUTION
const char *azshargs[4];
#endif
*pzerror = NULL;
*pftemp = FALSE;
aidescs[0] = SPAWN_NULL;
aidescs[1] = SPAWN_NULL;
aidescs[2] = SPAWN_NULL;
ferr = FALSE;
if (zinput != NULL)
{
aidescs[0] = open ((char *) zinput, O_RDONLY | O_NOCTTY, 0);
if (aidescs[0] < 0)
{
ulog (LOG_ERROR, "open (%s): %s", zinput, strerror (errno));
ferr = TRUE;
}
else if (fcntl (aidescs[0], F_SETFD,
fcntl (aidescs[0], F_GETFD, 0) | FD_CLOEXEC) < 0)
{
ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
ferr = TRUE;
}
}
if (! ferr && zoutput != NULL)
{
aidescs[1] = creat ((char *) zoutput, IPRIVATE_FILE_MODE);
if (aidescs[1] < 0)
{
ulog (LOG_ERROR, "creat (%s): %s", zoutput, strerror (errno));
*pftemp = TRUE;
ferr = TRUE;
}
else if (fcntl (aidescs[1], F_SETFD,
fcntl (aidescs[1], F_GETFD, 0) | FD_CLOEXEC) < 0)
{
ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
ferr = TRUE;
}
}
if (! ferr)
{
*pzerror = zstemp_file (qsys);
aidescs[2] = creat (*pzerror, IPRIVATE_FILE_MODE);
if (aidescs[2] < 0)
{
if (errno == ENOENT)
{
if (! fsysdep_make_dirs (*pzerror, FALSE))
{
*pftemp = TRUE;
ferr = TRUE;
}
else
aidescs[2] = creat (*pzerror, IPRIVATE_FILE_MODE);
}
if (! ferr && aidescs[2] < 0)
{
ulog (LOG_ERROR, "creat (%s): %s", *pzerror, strerror (errno));
*pftemp = TRUE;
ferr = TRUE;
}
}
if (! ferr
&& fcntl (aidescs[2], F_SETFD,
fcntl (aidescs[2], F_GETFD, 0) | FD_CLOEXEC) < 0)
{
ulog (LOG_ERROR, "fcntl (FD_CLOEXEC): %s", strerror (errno));
ferr = TRUE;
}
}
if (iseq == 0)
zxqtdir = XQTDIR;
else
{
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
zxqtdir = abxqtdir;
}
if (ferr)
{
if (aidescs[0] != SPAWN_NULL)
(void) close (aidescs[0]);
if (aidescs[1] != SPAWN_NULL)
(void) close (aidescs[1]);
if (aidescs[2] != SPAWN_NULL)
(void) close (aidescs[2]);
ubuffree (*pzerror);
return FALSE;
}
#if ALLOW_SH_EXECUTION
if (fshell)
{
azshargs[0] = "/bin/sh";
azshargs[1] = "-c";
azshargs[2] = zfullcmd;
azshargs[3] = NULL;
pazargs = azshargs;
}
#else
fshell = FALSE;
#endif
if (qsys->uuconf_pzpath == NULL)
zpath = NULL;
else
{
size_t c;
char **pz;
c = 0;
for (pz = qsys->uuconf_pzpath; *pz != NULL; pz++)
c += strlen (*pz) + 1;
zpath = zbufalc (c);
*zpath = '\0';
for (pz = qsys->uuconf_pzpath; *pz != NULL; pz++)
{
strcat (zpath, *pz);
if (pz[1] != NULL)
strcat (zpath, ":");
}
}
/* Pass zchdir as zxqtdir, fnosigs as TRUE, fshell as TRUE if we
aren't already using the shell. */
ipid = ixsspawn (pazargs, aidescs, TRUE, FALSE, zxqtdir, TRUE,
! fshell, zpath, qsys->uuconf_zname, zuser);
ierr = errno;
ubuffree (zpath);
if (aidescs[0] != SPAWN_NULL)
(void) close (aidescs[0]);
if (aidescs[1] != SPAWN_NULL)
(void) close (aidescs[1]);
if (aidescs[2] != SPAWN_NULL)
(void) close (aidescs[2]);
if (ipid < 0)
{
ulog (LOG_ERROR, "ixsspawn: %s", strerror (ierr));
*pftemp = TRUE;
return FALSE;
}
istat = ixswait ((unsigned long) ipid, "Execution");
if (istat == EX_TEMPFAIL)
*pftemp = TRUE;
return istat == 0;
}
/* Lock a uuxqt process. */
int
ixsysdep_lock_uuxqt (zcmd, cmaxuuxqts)
const char *zcmd;
int cmaxuuxqts;
{
char ab[sizeof "LCK.XQT.9999"];
int i;
if (cmaxuuxqts <= 0 || cmaxuuxqts >= 10000)
cmaxuuxqts = 9999;
for (i = 0; i < cmaxuuxqts; i++)
{
sprintf (ab, "LCK.XQT.%d", i);
if (fsdo_lock (ab, TRUE, (boolean *) NULL))
break;
}
if (i >= cmaxuuxqts)
return -1;
if (zcmd != NULL)
{
char abcmd[sizeof "LXQ.123456789"];
sprintf (abcmd, "LXQ.%.9s", zcmd);
abcmd[strcspn (abcmd, " \t/")] = '\0';
if (! fsdo_lock (abcmd, TRUE, (boolean *) NULL))
{
(void) fsdo_unlock (ab, TRUE);
return -1;
}
}
return i;
}
/* Unlock a uuxqt process. */
boolean
fsysdep_unlock_uuxqt (iseq, zcmd, cmaxuuxqts)
int iseq;
const char *zcmd;
int cmaxuuxqts;
{
char ab[sizeof "LCK.XQT.9999"];
boolean fret;
fret = TRUE;
sprintf (ab, "LCK.XQT.%d", iseq);
if (! fsdo_unlock (ab, TRUE))
fret = FALSE;
if (zcmd != NULL)
{
char abcmd[sizeof "LXQ.123456789"];
sprintf (abcmd, "LXQ.%.9s", zcmd);
abcmd[strcspn (abcmd, " \t/")] = '\0';
if (! fsdo_unlock (abcmd, TRUE))
fret = FALSE;
}
return fret;
}
/* See whether a particular uuxqt command is locked (this depends on
the implementation of fsdo_lock). */
boolean
fsysdep_uuxqt_locked (zcmd)
const char *zcmd;
{
char ab[sizeof "LXQ.123456789"];
struct stat s;
sprintf (ab, "LXQ.%.9s", zcmd);
return stat (ab, &s) == 0;
}
/* Lock a particular execute file. */
boolean
fsysdep_lock_uuxqt_file (zfile)
const char *zfile;
{
char *zcopy, *z;
boolean fret;
zcopy = zbufcpy (zfile);
z = strrchr (zcopy, '/');
if (z == NULL)
*zcopy = 'L';
else
*(z + 1) = 'L';
fret = fsdo_lock (zcopy, TRUE, (boolean *) NULL);
ubuffree (zcopy);
return fret;
}
/* Unlock a particular execute file. */
boolean
fsysdep_unlock_uuxqt_file (zfile)
const char *zfile;
{
char *zcopy, *z;
boolean fret;
zcopy = zbufcpy (zfile);
z = strrchr (zcopy, '/');
if (z == NULL)
*zcopy = 'L';
else
*(z + 1) = 'L';
fret = fsdo_unlock (zcopy, TRUE);
ubuffree (zcopy);
return fret;
}
/* Lock the execute directory. Since we use a different directory
depending on which LCK.XQT.dddd file we got, there is actually no
need to create a lock file. We do make sure that the directory
exists, though. */
boolean
fsysdep_lock_uuxqt_dir (iseq)
int iseq;
{
const char *zxqtdir;
char abxqtdir[sizeof XQTDIR + 4];
if (iseq == 0)
zxqtdir = XQTDIR;
else
{
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
zxqtdir = abxqtdir;
}
if (mkdir (zxqtdir, S_IRWXU) < 0
&& errno != EEXIST
&& errno != EISDIR)
{
ulog (LOG_ERROR, "mkdir (%s): %s", zxqtdir, strerror (errno));
return FALSE;
}
return TRUE;
}
/* Unlock the execute directory and clear it out. The lock is
actually the LCK.XQT.dddd file, so we don't unlock it, but we do
remove all the files. */
boolean
fsysdep_unlock_uuxqt_dir (iseq)
int iseq;
{
const char *zxqtdir;
char abxqtdir[sizeof XQTDIR + 4];
DIR *qdir;
if (iseq == 0)
zxqtdir = XQTDIR;
else
{
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
zxqtdir = abxqtdir;
}
qdir = opendir ((char *) zxqtdir);
if (qdir != NULL)
{
struct dirent *qentry;
while ((qentry = readdir (qdir)) != NULL)
{
char *z;
if (strcmp (qentry->d_name, ".") == 0
|| strcmp (qentry->d_name, "..") == 0)
continue;
z = zsysdep_in_dir (zxqtdir, qentry->d_name);
if (remove (z) < 0)
{
int ierr;
ierr = errno;
if (! fsysdep_directory (z))
ulog (LOG_ERROR, "remove (%s): %s", z,
strerror (ierr));
else
(void) fsysdep_rmdir (z);
}
ubuffree (z);
}
closedir (qdir);
}
return TRUE;
}
/* Move files into the execution directory. */
boolean
fsysdep_move_uuxqt_files (cfiles, pzfrom, pzto, fto, iseq, pzinput)
int cfiles;
const char *const *pzfrom;
const char *const *pzto;
boolean fto;
int iseq;
char **pzinput;
{
char *zinput;
const char *zxqtdir;
char abxqtdir[sizeof XQTDIR + 4];
int i;
if (pzinput == NULL)
zinput = NULL;
else
zinput = *pzinput;
if (iseq == 0)
zxqtdir = XQTDIR;
else
{
sprintf (abxqtdir, "%s%04d", XQTDIR, iseq);
zxqtdir = abxqtdir;
}
for (i = 0; i < cfiles; i++)
{
const char *zfrom, *zto;
char *zfree;
if (pzto[i] == NULL)
continue;
zfree = zsysdep_in_dir (zxqtdir, pzto[i]);
zfrom = pzfrom[i];
zto = zfree;
if (zinput != NULL && strcmp (zinput, zfrom) == 0)
{
*pzinput = zbufcpy (zto);
zinput = NULL;
}
if (! fto)
{
const char *ztemp;
ztemp = zfrom;
zfrom = zto;
zto = ztemp;
(void) chmod (zfrom, IPRIVATE_FILE_MODE);
}
if (rename (zfrom, zto) < 0)
{
#if HAVE_RENAME
/* On some systems the system call rename seems to fail for
arbitrary reasons. To get around this, we always try to
copy the file by hand if the rename failed. */
errno = EXDEV;
#endif
if (errno != EXDEV)
{
ulog (LOG_ERROR, "rename (%s, %s): %s", zfrom, zto,
strerror (errno));
ubuffree (zfree);
break;
}
if (! fcopy_file (zfrom, zto, FALSE, FALSE, FALSE))
{
ubuffree (zfree);
break;
}
if (remove (zfrom) < 0)
ulog (LOG_ERROR, "remove (%s): %s", zfrom,
strerror (errno));
}
if (fto)
(void) chmod (zto, IPUBLIC_FILE_MODE);
ubuffree (zfree);
}
if (i < cfiles)
{
if (fto)
(void) fsysdep_move_uuxqt_files (i, pzfrom, pzto, FALSE, iseq,
(char **) NULL);
return FALSE;
}
return TRUE;
}