746 lines
17 KiB
C
746 lines
17 KiB
C
/* $NetBSD: exec.c,v 1.23 2006/05/13 21:22:32 christos Exp $ */
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/*-
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* Copyright (c) 1980, 1991, 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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#if 0
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static char sccsid[] = "@(#)exec.c 8.3 (Berkeley) 5/23/95";
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#else
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__RCSID("$NetBSD: exec.c,v 1.23 2006/05/13 21:22:32 christos Exp $");
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#endif
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#endif /* not lint */
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#include <sys/param.h>
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#include <sys/stat.h>
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#include <sys/types.h>
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#include <dirent.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <stdarg.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include "csh.h"
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#include "extern.h"
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/*
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* System level search and execute of a command. We look in each directory
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* for the specified command name. If the name contains a '/' then we
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* execute only the full path name. If there is no search path then we
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* execute only full path names.
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*/
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extern char **environ;
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/*
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* As we search for the command we note the first non-trivial error
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* message for presentation to the user. This allows us often
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* to show that a file has the wrong mode/no access when the file
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* is not in the last component of the search path, so we must
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* go on after first detecting the error.
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*/
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static const char *exerr; /* Execution error message */
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static Char *expath; /* Path for exerr */
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/*
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* Xhash is an array of HSHSIZ bits (HSHSIZ / 8 chars), which are used
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* to hash execs. If it is allocated (havhash true), then to tell
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* whether ``name'' is (possibly) present in the i'th component
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* of the variable path, you look at the bit in xhash indexed by
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* hash(hashname("name"), i). This is setup automatically
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* after .login is executed, and recomputed whenever ``path'' is
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* changed.
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* The two part hash function is designed to let texec() call the
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* more expensive hashname() only once and the simple hash() several
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* times (once for each path component checked).
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* Byte size is assumed to be 8.
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*/
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#define HSHSIZ 8192 /* 1k bytes */
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#define HSHMASK (HSHSIZ - 1)
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#define HSHMUL 243
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static char xhash[HSHSIZ / 8];
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#define hash(a, b) (((a) * HSHMUL + (b)) & HSHMASK)
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#define bit(h, b) ((h)[(b) >> 3] & 1 << ((b) & 7)) /* bit test */
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#define bis(h, b) ((h)[(b) >> 3] |= 1 << ((b) & 7)) /* bit set */
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static int hits, misses;
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/* Dummy search path for just absolute search when no path */
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static Char *justabs[] = {STRNULL, 0};
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static void pexerr(void) __attribute__((noreturn));
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static void texec(Char *, Char **);
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static int hashname(Char *);
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static int tellmewhat(struct wordent *, Char *);
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static int executable(Char *, Char *, bool);
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static int iscommand(Char *);
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void
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/*ARGSUSED*/
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doexec(Char **v, struct command *t)
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{
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struct varent *pathv;
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Char *blk[2], **av, *dp, **pv, *sav;
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int i, hashval, hashval1;
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sigset_t nsigset;
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bool slash;
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hashval = 0;
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/*
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* Glob the command name. We will search $path even if this does something,
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* as in sh but not in csh. One special case: if there is no PATH, then we
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* execute only commands which start with '/'.
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*/
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blk[0] = t->t_dcom[0];
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blk[1] = 0;
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gflag = 0, tglob(blk);
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if (gflag) {
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pv = globall(blk);
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if (pv == 0) {
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setname(vis_str(blk[0]));
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stderror(ERR_NAME | ERR_NOMATCH);
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}
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gargv = 0;
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}
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else
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pv = saveblk(blk);
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trim(pv);
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exerr = 0;
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expath = Strsave(pv[0]);
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Vexpath = expath;
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pathv = adrof(STRpath);
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if (pathv == 0 && expath[0] != '/') {
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blkfree(pv);
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pexerr();
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}
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slash = any(short2str(expath), '/');
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/*
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* Glob the argument list, if necessary. Otherwise trim off the quote bits.
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*/
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gflag = 0;
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av = &t->t_dcom[1];
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tglob(av);
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if (gflag) {
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av = globall(av);
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if (av == 0) {
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blkfree(pv);
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setname(vis_str(expath));
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stderror(ERR_NAME | ERR_NOMATCH);
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}
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gargv = 0;
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}
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else
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av = saveblk(av);
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blkfree(t->t_dcom);
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t->t_dcom = blkspl(pv, av);
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xfree((ptr_t) pv);
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xfree((ptr_t) av);
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av = t->t_dcom;
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trim(av);
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if (*av == NULL || **av == '\0')
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pexerr();
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xechoit(av); /* Echo command if -x */
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/*
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* Since all internal file descriptors are set to close on exec, we don't
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* need to close them explicitly here. Just reorient ourselves for error
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* messages.
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*/
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SHIN = 0;
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SHOUT = 1;
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SHERR = 2;
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OLDSTD = 0;
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/*
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* We must do this AFTER any possible forking (like `foo` in glob) so that
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* this shell can still do subprocesses.
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*/
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sigemptyset(&nsigset);
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(void)sigprocmask(SIG_SETMASK, &nsigset, NULL);
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/*
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* If no path, no words in path, or a / in the filename then restrict the
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* command search.
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*/
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if (pathv == 0 || pathv->vec[0] == 0 || slash)
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pv = justabs;
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else
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pv = pathv->vec;
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sav = Strspl(STRslash, *av); /* / command name for postpending */
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Vsav = sav;
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if (havhash)
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hashval = hashname(*av);
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i = 0;
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hits++;
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do {
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/*
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* Try to save time by looking at the hash table for where this command
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* could be. If we are doing delayed hashing, then we put the names in
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* one at a time, as the user enters them. This is kinda like Korn
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* Shell's "tracked aliases".
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*/
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if (!slash && pv[0][0] == '/' && havhash) {
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hashval1 = hash(hashval, i);
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if (!bit(xhash, hashval1))
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goto cont;
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}
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if (pv[0][0] == 0 || eq(pv[0], STRdot)) /* don't make ./xxx */
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texec(*av, av);
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else {
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dp = Strspl(*pv, sav);
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Vdp = dp;
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texec(dp, av);
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Vdp = 0;
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xfree((ptr_t)dp);
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}
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misses++;
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cont:
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pv++;
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i++;
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} while (*pv);
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hits--;
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Vsav = 0;
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xfree((ptr_t)sav);
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pexerr();
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/* NOTREACHED */
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}
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static void
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pexerr(void)
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{
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/* Couldn't find the damn thing */
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if (expath) {
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setname(vis_str(expath));
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Vexpath = 0;
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xfree((ptr_t)expath);
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expath = 0;
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}
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else
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setname("");
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if (exerr)
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stderror(ERR_NAME | ERR_STRING, exerr);
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else
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stderror(ERR_NAME | ERR_COMMAND);
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/* NOTREACHED */
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}
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/*
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* Execute command f, arg list t.
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* Record error message if not found.
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* Also do shell scripts here.
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*/
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static void
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texec(Char *sf, Char **st)
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{
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struct varent *v;
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Char *lastsh[2], **vp, *st0, **ost;
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char *f, **t;
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int fd;
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unsigned char c = '\0';
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/* The order for the conversions is significant */
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t = short2blk(st);
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f = short2str(sf);
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Vt = t;
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errno = 0; /* don't use a previous error */
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(void)execve(f, t, environ);
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Vt = 0;
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blkfree((Char **)t);
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switch (errno) {
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case ENOEXEC:
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/*
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* From: casper@fwi.uva.nl (Casper H.S. Dik) If we could not execute
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* it, don't feed it to the shell if it looks like a binary!
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*/
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if ((fd = open(f, O_RDONLY)) != -1) {
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if (read(fd, (char *)&c, 1) == 1) {
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if (!Isprint(c) && (c != '\n' && c != '\t')) {
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(void)close(fd);
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/*
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* We *know* what ENOEXEC means.
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*/
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stderror(ERR_ARCH, f, strerror(errno));
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}
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}
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#ifdef _PATH_BSHELL
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else
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c = '#';
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#endif
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(void)close(fd);
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}
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/*
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* If there is an alias for shell, then put the words of the alias in
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* front of the argument list replacing the command name. Note no
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* interpretation of the words at this point.
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*/
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v = adrof1(STRshell, &aliases);
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if (v == 0) {
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vp = lastsh;
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vp[0] = adrof(STRshell) ? value(STRshell) : STR_SHELLPATH;
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vp[1] = NULL;
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#ifdef _PATH_BSHELL
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if (fd != -1 && c != '#')
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vp[0] = STR_BSHELL;
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#endif
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}
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else
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vp = v->vec;
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st0 = st[0];
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st[0] = sf;
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ost = st;
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st = blkspl(vp, st); /* Splice up the new arglst */
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ost[0] = st0;
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sf = *st;
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/* The order for the conversions is significant */
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t = short2blk(st);
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f = short2str(sf);
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xfree((ptr_t) st);
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Vt = t;
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(void)execve(f, t, environ);
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Vt = 0;
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blkfree((Char **) t);
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/* FALLTHROUGH */
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case ENOMEM:
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stderror(ERR_SYSTEM, f, strerror(errno));
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/* NOTREACHED */
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case ENOENT:
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break;
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default:
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if (exerr == 0) {
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exerr = strerror(errno);
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if (expath)
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xfree((ptr_t) expath);
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expath = Strsave(sf);
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Vexpath = expath;
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}
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}
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}
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/*ARGSUSED*/
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void
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execash(Char **t, struct command *kp)
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{
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jmp_buf osetexit;
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sig_t osigint, osigquit, osigterm;
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int my_reenter, odidfds, oOLDSTD, oSHERR, oSHIN, oSHOUT;
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int saveDIAG, saveIN, saveOUT, saveSTD;
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if (chkstop == 0 && setintr)
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panystop(0);
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/*
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* Hmm, we don't really want to do that now because we might
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* fail, but what is the choice
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*/
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rechist();
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osigint = signal(SIGINT, parintr);
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osigquit = signal(SIGQUIT, parintr);
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osigterm = signal(SIGTERM, parterm);
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odidfds = didfds;
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oSHIN = SHIN;
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oSHOUT = SHOUT;
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oSHERR = SHERR;
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oOLDSTD = OLDSTD;
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saveIN = dcopy(SHIN, -1);
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saveOUT = dcopy(SHOUT, -1);
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saveDIAG = dcopy(SHERR, -1);
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saveSTD = dcopy(OLDSTD, -1);
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lshift(kp->t_dcom, 1);
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getexit(osetexit);
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if ((my_reenter = setexit()) == 0) {
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SHIN = dcopy(0, -1);
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SHOUT = dcopy(1, -1);
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SHERR = dcopy(2, -1);
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didfds = 0;
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doexec(t, kp);
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}
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(void)signal(SIGINT, osigint);
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(void)signal(SIGQUIT, osigquit);
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(void)signal(SIGTERM, osigterm);
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doneinp = 0;
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didfds = odidfds;
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(void)close(SHIN);
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(void)close(SHOUT);
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(void)close(SHERR);
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(void)close(OLDSTD);
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SHIN = dmove(saveIN, oSHIN);
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SHOUT = dmove(saveOUT, oSHOUT);
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SHERR = dmove(saveDIAG, oSHERR);
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OLDSTD = dmove(saveSTD, oOLDSTD);
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resexit(osetexit);
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if (my_reenter)
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stderror(ERR_SILENT);
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}
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|
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void
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xechoit(Char **t)
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{
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if (adrof(STRecho)) {
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int odidfds = didfds;
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(void)fflush(csherr);
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odidfds = didfds;
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didfds = 0;
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blkpr(csherr, t);
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(void)fputc('\n', csherr);
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(void)fflush(csherr);
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didfds = odidfds;
|
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}
|
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}
|
|
|
|
void
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/*ARGSUSED*/
|
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dohash(Char **v, struct command *t)
|
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{
|
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struct dirent *dp;
|
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struct varent *pathv;
|
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DIR *dirp;
|
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Char **pv;
|
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int cnt, hashval, i;
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i = 0;
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havhash = 1;
|
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pathv = adrof(STRpath);
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|
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for (cnt = 0; cnt < sizeof xhash; cnt++)
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xhash[cnt] = 0;
|
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if (pathv == 0)
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return;
|
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for (pv = pathv->vec; *pv; pv++, i++) {
|
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if (pv[0][0] != '/')
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continue;
|
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dirp = opendir(short2str(*pv));
|
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if (dirp == NULL)
|
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continue;
|
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while ((dp = readdir(dirp)) != NULL) {
|
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if (dp->d_ino == 0)
|
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continue;
|
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if (dp->d_name[0] == '.' &&
|
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(dp->d_name[1] == '\0' ||
|
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(dp->d_name[1] == '.' && dp->d_name[2] == '\0')))
|
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continue;
|
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hashval = hash(hashname(str2short(dp->d_name)), i);
|
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bis(xhash, hashval);
|
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/* tw_add_comm_name (dp->d_name); */
|
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}
|
|
(void) closedir(dirp);
|
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}
|
|
}
|
|
|
|
void
|
|
/*ARGSUSED*/
|
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dounhash(Char **v, struct command *t)
|
|
{
|
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havhash = 0;
|
|
}
|
|
|
|
void
|
|
/*ARGSUSED*/
|
|
hashstat(Char **v, struct command *t)
|
|
{
|
|
if (hits + misses)
|
|
(void)fprintf(cshout, "%d hits, %d misses, %d%%\n",
|
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hits, misses, 100 * hits / (hits + misses));
|
|
}
|
|
|
|
/*
|
|
* Hash a command name.
|
|
*/
|
|
static int
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hashname(Char *cp)
|
|
{
|
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long h = 0;
|
|
|
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while (*cp)
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h = hash(h, *cp++);
|
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return ((int) h);
|
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}
|
|
|
|
static int
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iscommand(Char *name)
|
|
{
|
|
struct varent *v;
|
|
Char **pv, *sav;
|
|
int hashval, hashval1, i;
|
|
bool slash;
|
|
|
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hashval = 0;
|
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slash = any(short2str(name), '/');
|
|
v = adrof(STRpath);
|
|
|
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if (v == 0 || v->vec[0] == 0 || slash)
|
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pv = justabs;
|
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else
|
|
pv = v->vec;
|
|
sav = Strspl(STRslash, name); /* / command name for postpending */
|
|
if (havhash)
|
|
hashval = hashname(name);
|
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i = 0;
|
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do {
|
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if (!slash && pv[0][0] == '/' && havhash) {
|
|
hashval1 = hash(hashval, i);
|
|
if (!bit(xhash, hashval1))
|
|
goto cont;
|
|
}
|
|
if (pv[0][0] == 0 || eq(pv[0], STRdot)) { /* don't make ./xxx */
|
|
if (executable(NULL, name, 0)) {
|
|
xfree((ptr_t) sav);
|
|
return i + 1;
|
|
}
|
|
}
|
|
else {
|
|
if (executable(*pv, sav, 0)) {
|
|
xfree((ptr_t) sav);
|
|
return i + 1;
|
|
}
|
|
}
|
|
cont:
|
|
pv++;
|
|
i++;
|
|
} while (*pv);
|
|
xfree((ptr_t) sav);
|
|
return 0;
|
|
}
|
|
|
|
/* Also by:
|
|
* Andreas Luik <luik@isaak.isa.de>
|
|
* I S A GmbH - Informationssysteme fuer computerintegrierte Automatisierung
|
|
* Azenberstr. 35
|
|
* D-7000 Stuttgart 1
|
|
* West-Germany
|
|
* is the executable() routine below and changes to iscommand().
|
|
* Thanks again!!
|
|
*/
|
|
|
|
/*
|
|
* executable() examines the pathname obtained by concatenating dir and name
|
|
* (dir may be NULL), and returns 1 either if it is executable by us, or
|
|
* if dir_ok is set and the pathname refers to a directory.
|
|
* This is a bit kludgy, but in the name of optimization...
|
|
*/
|
|
static int
|
|
executable(Char *dir, Char *name, bool dir_ok)
|
|
{
|
|
struct stat stbuf;
|
|
Char path[MAXPATHLEN + 1], *dp, *sp;
|
|
char *strname;
|
|
|
|
if (dir && *dir) {
|
|
for (dp = path, sp = dir; *sp; *dp++ = *sp++)
|
|
if (dp == &path[MAXPATHLEN + 1]) {
|
|
*--dp = '\0';
|
|
break;
|
|
}
|
|
for (sp = name; *sp; *dp++ = *sp++)
|
|
if (dp == &path[MAXPATHLEN + 1]) {
|
|
*--dp = '\0';
|
|
break;
|
|
}
|
|
*dp = '\0';
|
|
strname = short2str(path);
|
|
}
|
|
else
|
|
strname = short2str(name);
|
|
return (stat(strname, &stbuf) != -1 && ((S_ISREG(stbuf.st_mode) &&
|
|
/* save time by not calling access() in the hopeless case */
|
|
(stbuf.st_mode & (S_IXOTH | S_IXGRP | S_IXUSR)) &&
|
|
access(strname, X_OK) == 0) || (dir_ok && S_ISDIR(stbuf.st_mode))));
|
|
}
|
|
|
|
/* The dowhich() is by:
|
|
* Andreas Luik <luik@isaak.isa.de>
|
|
* I S A GmbH - Informationssysteme fuer computerintegrierte Automatisierung
|
|
* Azenberstr. 35
|
|
* D-7000 Stuttgart 1
|
|
* West-Germany
|
|
* Thanks!!
|
|
*/
|
|
/*ARGSUSED*/
|
|
void
|
|
dowhich(Char **v, struct command *c)
|
|
{
|
|
struct wordent lexw[3];
|
|
struct varent *vp;
|
|
|
|
lexw[0].next = &lexw[1];
|
|
lexw[1].next = &lexw[2];
|
|
lexw[2].next = &lexw[0];
|
|
|
|
lexw[0].prev = &lexw[2];
|
|
lexw[1].prev = &lexw[0];
|
|
lexw[2].prev = &lexw[1];
|
|
|
|
lexw[0].word = STRNULL;
|
|
lexw[2].word = STRret;
|
|
|
|
while (*++v) {
|
|
if ((vp = adrof1(*v, &aliases)) != NULL) {
|
|
(void)fprintf(cshout, "%s: \t aliased to ", vis_str(*v));
|
|
blkpr(cshout, vp->vec);
|
|
(void)fputc('\n', cshout);
|
|
set(STRstatus, Strsave(STR0));
|
|
}
|
|
else {
|
|
lexw[1].word = *v;
|
|
set(STRstatus, Strsave(tellmewhat(lexw, NULL) ? STR0 : STR1));
|
|
}
|
|
}
|
|
}
|
|
|
|
static int
|
|
tellmewhat(struct wordent *lexp, Char *str)
|
|
{
|
|
struct biltins *bptr;
|
|
struct wordent *sp;
|
|
Char *cmd, *s0, *s1, *s2;
|
|
int i;
|
|
bool aliased, found;
|
|
Char qc;
|
|
|
|
aliased = 0;
|
|
sp = lexp->next;
|
|
|
|
if (adrof1(sp->word, &aliases)) {
|
|
alias(lexp);
|
|
sp = lexp->next;
|
|
aliased = 1;
|
|
}
|
|
|
|
s0 = sp->word; /* to get the memory freeing right... */
|
|
|
|
/* handle quoted alias hack */
|
|
if ((*(sp->word) & (QUOTE | TRIM)) == QUOTE)
|
|
(sp->word)++;
|
|
|
|
/* do quoting, if it hasn't been done */
|
|
s1 = s2 = sp->word;
|
|
while (*s2)
|
|
switch (*s2) {
|
|
case '\'':
|
|
case '"':
|
|
qc = *s2++;
|
|
while (*s2 && *s2 != qc)
|
|
*s1++ = *s2++ | QUOTE;
|
|
if (*s2)
|
|
s2++;
|
|
break;
|
|
case '\\':
|
|
if (*++s2)
|
|
*s1++ = *s2++ | QUOTE;
|
|
break;
|
|
default:
|
|
*s1++ = *s2++;
|
|
}
|
|
*s1 = '\0';
|
|
|
|
for (bptr = bfunc; bptr < &bfunc[nbfunc]; bptr++) {
|
|
if (eq(sp->word, str2short(bptr->bname))) {
|
|
if (str == NULL) {
|
|
if (aliased)
|
|
prlex(cshout, lexp);
|
|
(void)fprintf(cshout, "%s: shell built-in command.\n",
|
|
vis_str(sp->word));
|
|
}
|
|
else
|
|
(void)Strcpy(str, sp->word);
|
|
sp->word = s0; /* we save and then restore this */
|
|
return 1;
|
|
}
|
|
}
|
|
|
|
sp->word = cmd = globone(sp->word, G_IGNORE);
|
|
|
|
if ((i = iscommand(sp->word)) != 0) {
|
|
Char **pv;
|
|
struct varent *v;
|
|
bool slash = any(short2str(sp->word), '/');
|
|
|
|
v = adrof(STRpath);
|
|
if (v == 0 || v->vec[0] == 0 || slash)
|
|
pv = justabs;
|
|
else
|
|
pv = v->vec;
|
|
|
|
while (--i)
|
|
pv++;
|
|
if (pv[0][0] == 0 || eq(pv[0], STRdot)) {
|
|
if (!slash) {
|
|
sp->word = Strspl(STRdotsl, sp->word);
|
|
prlex(cshout, lexp);
|
|
xfree((ptr_t) sp->word);
|
|
}
|
|
else
|
|
prlex(cshout, lexp);
|
|
}
|
|
else {
|
|
s1 = Strspl(*pv, STRslash);
|
|
sp->word = Strspl(s1, sp->word);
|
|
xfree((ptr_t) s1);
|
|
if (str == NULL)
|
|
prlex(cshout, lexp);
|
|
else
|
|
(void)Strcpy(str, sp->word);
|
|
xfree((ptr_t) sp->word);
|
|
}
|
|
found = 1;
|
|
}
|
|
else {
|
|
if (str == NULL) {
|
|
if (aliased)
|
|
prlex(cshout, lexp);
|
|
(void)fprintf(csherr,
|
|
"%s: Command not found.\n", vis_str(sp->word));
|
|
}
|
|
else
|
|
(void)Strcpy(str, sp->word);
|
|
found = 0;
|
|
}
|
|
sp->word = s0; /* we save and then restore this */
|
|
xfree((ptr_t) cmd);
|
|
return found;
|
|
}
|