/* $OpenBSD: find.c,v 1.23 2018/08/01 06:39:58 tb Exp $ */ /*- * Copyright (c) 1991, 1993 * The Regents of the University of California. All rights reserved. * * This code is derived from software contributed to Berkeley by * Cimarron D. Taylor of the University of California, Berkeley. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/types.h> #include <sys/stat.h> #include <err.h> #include <errno.h> #include <fts.h> #include <signal.h> #include <stdio.h> #include <string.h> #include <stdlib.h> #include <unistd.h> int mayexecve; #include "find.h" /* * find_formplan -- * process the command line and create a "plan" corresponding to the * command arguments. */ PLAN * find_formplan(char **argv) { PLAN *plan, *tail, *new; /* * for each argument in the command line, determine what kind of node * it is, create the appropriate node type and add the new plan node * to the end of the existing plan. The resulting plan is a linked * list of plan nodes. For example, the string: * * % find . -name foo -newer bar -print * * results in the plan: * * [-name foo]--> [-newer bar]--> [-print] * * in this diagram, `[-name foo]' represents the plan node generated * by c_name() with an argument of foo and `-->' represents the * plan->next pointer. */ for (plan = tail = NULL; *argv;) { if (!(new = find_create(&argv))) continue; if (plan == NULL) tail = plan = new; else { tail->next = new; tail = new; } } /* * if the user didn't specify one of -delete, -exec, -execdir, * -ls, -ok, -print or -print0, then -print is assumed so we * bracket the current expression with parens, if necessary, * and add a -print node on the end. */ if (!isoutput) { if (plan == NULL) { new = c_print(NULL, NULL, 0); tail = plan = new; } else { new = c_openparen(NULL, NULL, 0); new->next = plan; plan = new; new = c_closeparen(NULL, NULL, 0); tail->next = new; tail = new; new = c_print(NULL, NULL, 0); tail->next = new; tail = new; } } /* * the command line has been completely processed into a search plan * except for the (, ), !, and -o operators. Rearrange the plan so * that the portions of the plan which are affected by the operators * are moved into operator nodes themselves. For example: * * [!]--> [-name foo]--> [-print] * * becomes * * [! [-name foo] ]--> [-print] * * and * * [(]--> [-depth]--> [-name foo]--> [)]--> [-print] * * becomes * * [expr [-depth]-->[-name foo] ]--> [-print] * * operators are handled in order of precedence. */ plan = paren_squish(plan); /* ()'s */ plan = not_squish(plan); /* !'s */ plan = or_squish(plan); /* -o's */ return (plan); } FTS *tree; /* pointer to top of FTS hierarchy */ /* * find_execute -- * take a search plan and an array of search paths and executes the plan * over all FTSENT's returned for the given search paths. */ FTSENT *entry; /* shared with SIGINFO handler */ int find_execute(PLAN *plan, /* search plan */ char **paths) /* array of pathnames to traverse */ { sigset_t fullset, oset; int r, rval; PLAN *p; if (mayexecve == 0) { if (isdelete) { if (pledge("stdio rpath cpath getpw", NULL) == -1) err(1, "pledge"); } else { if (pledge("stdio rpath getpw", NULL) == -1) err(1, "pledge"); } } else { if (isdelete) { if (pledge("stdio rpath cpath getpw proc exec", NULL) == -1) err(1, "pledge"); } else { if (pledge("stdio rpath getpw proc exec", NULL) == -1) err(1, "pledge"); } } rval = 0; if (!(tree = fts_open(paths, ftsoptions, NULL))) err(1, "fts_open"); sigfillset(&fullset); for (;;) { (void)sigprocmask(SIG_BLOCK, &fullset, &oset); entry = fts_read(tree); (void)sigprocmask(SIG_SETMASK, &oset, NULL); if (entry == NULL) { if (errno) err(1, "fts_read"); break; } switch (entry->fts_info) { case FTS_D: if (isdepth) continue; break; case FTS_DP: if (!isdepth) continue; break; case FTS_DNR: case FTS_ERR: case FTS_NS: (void)fflush(stdout); warnc(entry->fts_errno, "%s", entry->fts_path); rval = 1; continue; } #define BADCH " \t\n\\'\"" if (isxargs && strpbrk(entry->fts_path, BADCH)) { (void)fflush(stdout); warnx("%s: illegal path", entry->fts_path); rval = 1; continue; } /* * Call all the functions in the execution plan until one is * false or all have been executed. This is where we do all * the work specified by the user on the command line. */ for (p = plan; p && (p->eval)(p, entry); p = p->next) ; } (void)fts_close(tree); /* * Cleanup any plans with leftover state. * Keep the last non-zero return value. */ if ((r = find_traverse(plan, plan_cleanup, NULL)) != 0) rval = r; return (rval); } /* * find_traverse -- * traverse the plan tree and execute func() on all plans. This * does not evaluate each plan's eval() function; it is intended * for operations that must run on all plans, such as state * cleanup. * * If any func() returns non-zero, then so will find_traverse(). */ int find_traverse(PLAN *plan, int (*func)(PLAN *, void *), void *arg) { PLAN *p; int r, rval; rval = 0; for (p = plan; p; p = p->next) { if ((r = func(p, arg)) != 0) rval = r; if (p->type == N_EXPR || p->type == N_OR) { if (p->p_data[0]) if ((r = find_traverse(p->p_data[0], func, arg)) != 0) rval = r; if (p->p_data[1]) if ((r = find_traverse(p->p_data[1], func, arg)) != 0) rval = r; } } return rval; }
