446 lines
11 KiB
C
446 lines
11 KiB
C
/*-
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* Copyright (c) 1980, 1991 The Regents of the University of California.
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* 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. All advertising materials mentioning features or use of this software
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* must display the following acknowledgement:
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* This product includes software developed by the University of
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* California, Berkeley and its contributors.
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* 4. 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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#ifndef lint
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static char sccsid[] = "@(#)exec.c 5.17 (Berkeley) 6/17/91";
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static char rcsid[] = "$Header: /cvsroot/src/bin/csh/exec.c,v 1.3 1993/03/23 00:24:33 cgd Exp $";
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#endif /* not lint */
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#include <sys/types.h>
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#include <dirent.h>
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#include <fcntl.h>
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#include <errno.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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#if __STDC__
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# include <stdarg.h>
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#else
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# include <varargs.h>
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#endif
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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 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 __P((void));
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static void texec __P((Char *, Char **));
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static int hashname __P((Char *));
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void
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doexec(t)
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register struct command *t;
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{
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register Char *dp, **pv, **av, *sav;
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register struct varent *v;
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register bool slash;
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register int hashval = 0, hashval1, i;
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Char *blk[2];
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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(short2str(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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v = adrof(STRpath);
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if (v == 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(short2str(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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SHDIAG = 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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(void) sigsetmask((sigset_t) 0);
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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 (v == 0 || v->vec[0] == 0 || slash)
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pv = justabs;
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else
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pv = v->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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}
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static void
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pexerr()
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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(short2str(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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stderror(ERR_NAME | ERR_COMMAND);
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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(sf, st)
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Char *sf;
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register Char **st;
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{
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register char **t;
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register char *f;
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register struct varent *v;
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register Char **vp;
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Char *lastsh[2];
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int fd;
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unsigned char c;
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Char *st0, **ost;
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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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/* The sky is falling, the sky is falling! */
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case ENOMEM:
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stderror(ERR_SYSTEM, f, strerror(errno));
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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(t, kp)
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char **t;
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register struct command *kp;
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{
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if (chkstop == 0 && setintr)
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panystop(0);
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rechist();
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(void) signal(SIGINT, parintr);
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(void) signal(SIGQUIT, parintr);
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(void) signal(SIGTERM, parterm); /* if doexec loses, screw */
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lshift(kp->t_dcom, 1);
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exiterr = 1;
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doexec(kp);
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/* NOTREACHED */
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}
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void
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xechoit(t)
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Char **t;
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{
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if (adrof(STRecho)) {
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flush();
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haderr = 1;
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blkpr(t), xputchar('\n');
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haderr = 0;
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}
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}
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/*VARARGS0*/
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void
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dohash()
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{
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DIR *dirp;
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register struct dirent *dp;
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register int cnt;
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int i = 0;
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struct varent *v = adrof(STRpath);
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Char **pv;
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int hashval;
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havhash = 1;
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for (cnt = 0; cnt < sizeof xhash; cnt++)
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xhash[cnt] = 0;
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if (v == 0)
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return;
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for (pv = v->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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}
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(void) closedir(dirp);
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}
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}
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void
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dounhash()
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{
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havhash = 0;
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}
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void
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hashstat()
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{
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if (hits + misses)
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xprintf("%d hits, %d misses, %d%%\n",
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hits, misses, 100 * hits / (hits + misses));
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}
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/*
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* Hash a command name.
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*/
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static int
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hashname(cp)
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register Char *cp;
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{
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register 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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}
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