Annotation of src/usr.bin/find/find.c, Revision 1.20
1.20 ! deraadt 1: /* $OpenBSD: find.c,v 1.19 2015/10/09 01:37:07 deraadt Exp $ */
1.2 deraadt 2:
1.1 deraadt 3: /*-
4: * Copyright (c) 1991, 1993
5: * The Regents of the University of California. All rights reserved.
6: *
7: * This code is derived from software contributed to Berkeley by
8: * Cimarron D. Taylor of the University of California, Berkeley.
9: *
10: * Redistribution and use in source and binary forms, with or without
11: * modification, are permitted provided that the following conditions
12: * are met:
13: * 1. Redistributions of source code must retain the above copyright
14: * notice, this list of conditions and the following disclaimer.
15: * 2. Redistributions in binary form must reproduce the above copyright
16: * notice, this list of conditions and the following disclaimer in the
17: * documentation and/or other materials provided with the distribution.
1.9 millert 18: * 3. Neither the name of the University nor the names of its contributors
1.1 deraadt 19: * may be used to endorse or promote products derived from this software
20: * without specific prior written permission.
21: *
22: * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
23: * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
24: * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
25: * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
26: * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
27: * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
28: * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
29: * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
30: * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
31: * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
32: * SUCH DAMAGE.
33: */
34:
35: #include <sys/types.h>
36: #include <sys/stat.h>
37:
38: #include <err.h>
39: #include <errno.h>
40: #include <fts.h>
1.8 millert 41: #include <signal.h>
1.1 deraadt 42: #include <stdio.h>
43: #include <string.h>
44: #include <stdlib.h>
1.18 deraadt 45: #include <unistd.h>
46:
47: int mayexecve;
1.1 deraadt 48:
49: #include "find.h"
50:
51: /*
52: * find_formplan --
53: * process the command line and create a "plan" corresponding to the
54: * command arguments.
55: */
56: PLAN *
1.11 deraadt 57: find_formplan(char **argv)
1.1 deraadt 58: {
59: PLAN *plan, *tail, *new;
60:
61: /*
62: * for each argument in the command line, determine what kind of node
63: * it is, create the appropriate node type and add the new plan node
64: * to the end of the existing plan. The resulting plan is a linked
65: * list of plan nodes. For example, the string:
66: *
67: * % find . -name foo -newer bar -print
68: *
69: * results in the plan:
70: *
71: * [-name foo]--> [-newer bar]--> [-print]
72: *
73: * in this diagram, `[-name foo]' represents the plan node generated
74: * by c_name() with an argument of foo and `-->' represents the
75: * plan->next pointer.
76: */
77: for (plan = tail = NULL; *argv;) {
78: if (!(new = find_create(&argv)))
79: continue;
80: if (plan == NULL)
81: tail = plan = new;
82: else {
83: tail->next = new;
84: tail = new;
85: }
86: }
87:
88: /*
89: * if the user didn't specify one of -print, -ok or -exec, then -print
90: * is assumed so we bracket the current expression with parens, if
91: * necessary, and add a -print node on the end.
92: */
93: if (!isoutput) {
94: if (plan == NULL) {
1.10 deraadt 95: new = c_print(NULL, NULL, 0);
1.1 deraadt 96: tail = plan = new;
97: } else {
1.10 deraadt 98: new = c_openparen(NULL, NULL, 0);
1.1 deraadt 99: new->next = plan;
100: plan = new;
1.10 deraadt 101: new = c_closeparen(NULL, NULL, 0);
1.1 deraadt 102: tail->next = new;
103: tail = new;
1.10 deraadt 104: new = c_print(NULL, NULL, 0);
1.1 deraadt 105: tail->next = new;
106: tail = new;
107: }
108: }
109:
110: /*
111: * the command line has been completely processed into a search plan
112: * except for the (, ), !, and -o operators. Rearrange the plan so
113: * that the portions of the plan which are affected by the operators
114: * are moved into operator nodes themselves. For example:
115: *
116: * [!]--> [-name foo]--> [-print]
117: *
118: * becomes
119: *
120: * [! [-name foo] ]--> [-print]
121: *
122: * and
123: *
124: * [(]--> [-depth]--> [-name foo]--> [)]--> [-print]
125: *
126: * becomes
127: *
128: * [expr [-depth]-->[-name foo] ]--> [-print]
129: *
130: * operators are handled in order of precedence.
131: */
132:
133: plan = paren_squish(plan); /* ()'s */
134: plan = not_squish(plan); /* !'s */
135: plan = or_squish(plan); /* -o's */
136: return (plan);
137: }
138:
139: FTS *tree; /* pointer to top of FTS hierarchy */
140:
141: /*
142: * find_execute --
143: * take a search plan and an array of search paths and executes the plan
144: * over all FTSENT's returned for the given search paths.
145: */
1.3 tholo 146:
147: FTSENT *entry; /* shared with SIGINFO handler */
148:
1.15 jacekm 149: int
1.11 deraadt 150: find_execute(PLAN *plan, /* search plan */
151: char **paths) /* array of pathnames to traverse */
1.1 deraadt 152: {
1.8 millert 153: sigset_t fullset, oset;
1.16 pascal 154: int r, rval;
1.1 deraadt 155: PLAN *p;
1.18 deraadt 156:
157: if (mayexecve == 0)
1.20 ! deraadt 158: if (pledge("stdio rpath getpw", NULL) == -1)
1.19 deraadt 159: err(1, "pledge");
1.15 jacekm 160:
161: rval = 0;
1.1 deraadt 162:
1.4 kstailey 163: if (!(tree = fts_open(paths, ftsoptions, NULL)))
1.13 jmc 164: err(1, "fts_open");
1.1 deraadt 165:
1.8 millert 166: sigfillset(&fullset);
167: for (;;) {
168: (void)sigprocmask(SIG_BLOCK, &fullset, &oset);
169: entry = fts_read(tree);
170: (void)sigprocmask(SIG_SETMASK, &oset, NULL);
1.12 otto 171: if (entry == NULL) {
172: if (errno)
173: err(1, "fts_read");
1.8 millert 174: break;
1.12 otto 175: }
1.8 millert 176:
1.6 millert 177: switch (entry->fts_info) {
1.1 deraadt 178: case FTS_D:
179: if (isdepth)
180: continue;
181: break;
182: case FTS_DP:
183: if (!isdepth)
184: continue;
185: break;
186: case FTS_DNR:
187: case FTS_ERR:
188: case FTS_NS:
189: (void)fflush(stdout);
1.17 millert 190: warnc(entry->fts_errno, "%s", entry->fts_path);
1.15 jacekm 191: rval = 1;
1.1 deraadt 192: continue;
193: }
194: #define BADCH " \t\n\\'\""
195: if (isxargs && strpbrk(entry->fts_path, BADCH)) {
196: (void)fflush(stdout);
197: warnx("%s: illegal path", entry->fts_path);
1.15 jacekm 198: rval = 1;
1.1 deraadt 199: continue;
200: }
1.6 millert 201:
202: /*
203: * Call all the functions in the execution plan until one is
1.1 deraadt 204: * false or all have been executed. This is where we do all
205: * the work specified by the user on the command line.
206: */
1.6 millert 207: for (p = plan; p && (p->eval)(p, entry); p = p->next)
208: ;
1.1 deraadt 209: }
210: (void)fts_close(tree);
1.16 pascal 211:
212: /*
213: * Cleanup any plans with leftover state.
214: * Keep the last non-zero return value.
215: */
216: if ((r = find_traverse(plan, plan_cleanup, NULL)) != 0)
217: rval = r;
1.15 jacekm 218: return (rval);
1.16 pascal 219: }
220:
221: /*
222: * find_traverse --
223: * traverse the plan tree and execute func() on all plans. This
224: * does not evaluate each plan's eval() function; it is intended
225: * for operations that must run on all plans, such as state
226: * cleanup.
227: *
228: * If any func() returns non-zero, then so will find_traverse().
229: */
230: int
231: find_traverse(PLAN *plan, int (*func)(PLAN *, void *), void *arg)
232: {
233: PLAN *p;
234: int r, rval;
235:
236: rval = 0;
237: for (p = plan; p; p = p->next) {
238: if ((r = func(p, arg)) != 0)
239: rval = r;
240: if (p->type == N_EXPR || p->type == N_OR) {
241: if (p->p_data[0])
242: if ((r = find_traverse(p->p_data[0],
243: func, arg)) != 0)
244: rval = r;
245: if (p->p_data[1])
246: if ((r = find_traverse(p->p_data[1],
247: func, arg)) != 0)
248: rval = r;
249: }
250: }
251: return rval;
1.1 deraadt 252: }
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