1 /* $OpenBSD: pathconf.c,v 1.8 2004/01/11 21:54:27 deraadt Exp $ */
2 /* $NetBSD: pathconf.c,v 1.2 1995/09/30 07:12:47 thorpej Exp $ */
3
4 /*
5 * Copyright (c) 1993
6 * The Regents of the University of California. All rights reserved.
7 *
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
10 * are met:
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
16 * 3. Neither the name of the University nor the names of its contributors
17 * may be used to endorse or promote products derived from this software
18 * without specific prior written permission.
19 *
20 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
21 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
22 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
23 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
24 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
25 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
26 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
27 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
28 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
29 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 * SUCH DAMAGE.
31 */
32
33 #ifndef lint
34 static char copyright[] =
35 "@(#) Copyright (c) 1993\n\
36 The Regents of the University of California. All rights reserved.\n";
37 #endif /* not lint */
38
39 #ifndef lint
40 #if 0
41 static char sccsid[] = "@(#)pathconf.c 8.1 (Berkeley) 6/6/93";
42 #else
43 static char rcsid[] = "$OpenBSD: pathconf.c,v 1.8 2004/01/11 21:54:27 deraadt Exp $";
44 #endif
45 #endif /* not lint */
46
47 #include <sys/param.h>
48 #include <sys/sysctl.h>
49 #include <sys/unistd.h>
50
51 #include <errno.h>
52 #include <stdio.h>
53 #include <stdlib.h>
54 #include <string.h>
55
56 #define PC_NAMES { \
57 { 0, 0 }, \
58 { "link_max", CTLTYPE_INT }, \
59 { "max_canon", CTLTYPE_INT }, \
60 { "max_input", CTLTYPE_INT }, \
61 { "name_max", CTLTYPE_INT }, \
62 { "path_max", CTLTYPE_INT }, \
63 { "pipe_buf", CTLTYPE_INT }, \
64 { "chown_restricted", CTLTYPE_INT }, \
65 { "no_trunc", CTLTYPE_INT }, \
66 { "vdisable", CTLTYPE_INT }, \
67 }
68 #define PC_MAXID 10
69
70 struct ctlname pcnames[] = PC_NAMES;
71 char names[BUFSIZ];
72
73 struct list {
74 struct ctlname *list;
75 int size;
76 };
77 struct list pclist = { pcnames, PC_MAXID };
78
79 int Aflag, aflag, nflag, wflag, stdinflag;
80
81 char *equ = " = ";
82
83 int
main(int argc,char * argv[])84 main(int argc, char *argv[])
85 {
86 char *path;
87 int ch;
88
89 while ((ch = getopt(argc, argv, "Aan")) != -1) {
90 switch (ch) {
91
92 case 'A':
93 Aflag = 1;
94 break;
95
96 case 'a':
97 aflag = 1;
98 break;
99
100 case 'n':
101 nflag = 1;
102 break;
103
104 default:
105 usage();
106 }
107 }
108 argc -= optind;
109 argv += optind;
110
111 if (argc == 0)
112 usage();
113 path = *argv++;
114 if (strcmp(path, "-") == 0)
115 stdinflag = 1;
116 argc--;
117 if (Aflag || aflag) {
118 listall(path, &pclist);
119 return (0);
120 }
121 if (argc == 0)
122 usage();
123 while (argc-- > 0)
124 parse(path, *argv, 1);
125 return (0);
126 }
127
128 /*
129 * List all variables known to the system.
130 */
listall(char * path,struct list * lp)131 listall(char *path, struct list *lp)
132 {
133 int lvl2;
134
135 if (lp->list == 0)
136 return;
137 for (lvl2 = 0; lvl2 < lp->size; lvl2++) {
138 if (lp->list[lvl2].ctl_name == 0)
139 continue;
140 parse(path, lp->list[lvl2].ctl_name, Aflag);
141 }
142 }
143
144 /*
145 * Parse a name into an index.
146 * Lookup and print out the attribute if it exists.
147 */
parse(char * pathname,char * string,int flags)148 parse(char *pathname, char *string, int flags)
149 {
150 int indx, value;
151 char *bufp, buf[BUFSIZ];
152
153 bufp = buf;
154 snprintf(buf, BUFSIZ, "%s", string);
155 if ((indx = findname(string, "top", &bufp, &pclist)) == -1)
156 return;
157 if (bufp) {
158 fprintf(stderr, "name %s in %s is unknown\n", *bufp, string);
159 return;
160 }
161 if (stdinflag)
162 value = fpathconf(0, indx);
163 else
164 value = pathconf(pathname, indx);
165 if (value == -1) {
166 if (flags == 0)
167 return;
168 switch (errno) {
169 case EOPNOTSUPP:
170 fprintf(stderr, "%s: value is not available\n", string);
171 return;
172 case ENOTDIR:
173 fprintf(stderr, "%s: specification is incomplete\n",
174 string);
175 return;
176 case ENOMEM:
177 fprintf(stderr, "%s: type is unknown to this program\n",
178 string);
179 return;
180 default:
181 perror(string);
182 return;
183 }
184 }
185 if (!nflag)
186 fprintf(stdout, "%s%s", string, equ);
187 fprintf(stdout, "%d\n", value);
188 }
189
190 /*
191 * Scan a list of names searching for a particular name.
192 */
findname(char * string,char * level,char ** bufp,struct list * namelist)193 findname(char *string, char *level, char **bufp, struct list *namelist)
194 {
195 char *name;
196 int i;
197
198 if (namelist->list == 0 || (name = strsep(bufp, ".")) == NULL) {
199 fprintf(stderr, "%s: incomplete specification\n", string);
200 return (-1);
201 }
202 for (i = 0; i < namelist->size; i++)
203 if (namelist->list[i].ctl_name != NULL &&
204 strcmp(name, namelist->list[i].ctl_name) == 0)
205 break;
206 if (i == namelist->size) {
207 fprintf(stderr, "%s level name %s in %s is invalid\n",
208 level, name, string);
209 return (-1);
210 }
211 return (i);
212 }
213
usage(void)214 usage(void)
215 {
216
217 (void)fprintf(stderr, "usage:\t%s\n\t%s\n\t%s\n",
218 "pathname [-n] variable ...",
219 "pathname [-n] -a", "pathname [-n] -A");
220 exit(1);
221 }
222