1 /*-
2 * Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer
10 * in this position and unchanged.
11 * 2. Redistributions in binary form must reproduce the above copyright
12 * notice, this list of conditions and the following disclaimer in the
13 * documentation and/or other materials provided with the distribution.
14 * 3. The name of the author may not be used to endorse or promote products
15 * derived from this software without specific prior written permission
16 *
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
18 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
19 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
20 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
21 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
22 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
24 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
25 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
26 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27 *
28 * $FreeBSD: src/usr.sbin/chkgrp/chkgrp.c,v 1.3.2.2 2001/07/12 22:57:35 mjacob Exp $
29 * $DragonFly: src/usr.sbin/chkgrp/chkgrp.c,v 1.6 2005/08/25 17:09:32 liamfoy Exp $
30 */
31 #include <sys/types.h>
32
33 #include <ctype.h>
34 #include <err.h>
35 #include <stdio.h>
36 #include <stdlib.h>
37 #include <string.h>
38 #include <sysexits.h>
39
40 #define DEFAULTGFILE "/etc/group"
41
42 static void usage(void);
43 static char empty[] = { 0 };
44
45 static void
usage(void)46 usage(void)
47 {
48 fprintf(stderr, "usage: chkgrp [groupfile]\n");
49 exit(EX_USAGE);
50 }
51
52 int
main(int argc,char * argv[])53 main(int argc, char *argv[])
54 {
55 size_t len;
56 int n = 0, i, k, e = 0;
57 char *line, *f[4], *p;
58 const char *cp, *gfn;
59 FILE *gf;
60
61 /* check arguments */
62 switch (argc) {
63 case 1:
64 gfn = DEFAULTGFILE;
65 break;
66 case 2:
67 gfn = argv[1];
68 break;
69 default:
70 gfn = NULL; /* silence compiler */
71 usage();
72 }
73
74 /* open group file */
75 if ((gf = fopen(gfn, "r")) == NULL)
76 err(EX_IOERR, "%s", gfn);
77
78 /* check line by line */
79 while (++n) {
80 if ((line = fgetln(gf, &len)) == NULL)
81 break;
82 if (len > 0 && line[len - 1] != '\n') {
83 warnx("%s: line %d: no newline character", gfn, n);
84 e++;
85 }
86 while (len && isspace(line[len - 1]))
87 len--;
88
89 /* ignore blank lines and comments */
90 for (p = line; p < (line + len); p++)
91 if (!isspace(*p))
92 break;
93 if (!len || (*p == '#')) {
94 #if 0
95 /* entry is correct, so print it */
96 printf("%*.*s\n", len, len, line);
97 #endif
98 continue;
99 }
100 /*
101 * A correct group entry has four colon-separated fields, the
102 * third of which must be entirely numeric and the fourth of
103 * which may be empty. We also check for any incorrect characters.
104 */
105 for (i = k = 0; k < 4; k++) {
106 for (f[k] = line + i; (i < (int)len) && (line[i] != ':'); i++)
107 /* nothing */ ;
108 if ((k < 3) && (line[i] != ':'))
109 break;
110 line[i++] = 0;
111 }
112
113 if (k < 4) {
114 warnx("%s: line %d: missing field(s)", gfn, n);
115 for ( ; k < 4; k++)
116 f[k] = empty;
117 e++;
118 }
119
120 for (cp = f[0] ; *cp ; cp++) {
121 if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-' &&
122 (cp > f[0] || *cp != '+')) {
123 warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
124 e++;
125 }
126 }
127
128 for (cp = f[3] ; *cp ; cp++) {
129 if (!isalnum(*cp) && *cp != ',' && *cp != '.' && *cp != '_' && *cp != '-') {
130 warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
131 e++;
132 }
133 }
134
135 /* check if fourth field ended with a colon */
136 if (i < (int)len) {
137 warnx("%s: line %d: too many fields", gfn, n);
138 e++;
139 }
140 /* check that none of the fields contain whitespace */
141 for (k = 0; k < 4; k++) {
142 if (strcspn(f[k], " \t") != strlen(f[k])) {
143 warnx("%s: line %d: field %d contains whitespace",
144 gfn, n, k + 1);
145 e++;
146 }
147 }
148
149 /* check that the GID is numeric */
150 if (strspn(f[2], "0123456789") != strlen(f[2])) {
151 warnx("%s: line %d: GID is not numeric", gfn, n);
152 e++;
153 }
154 #if 0
155 /* entry is correct, so print it */
156 printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]);
157 #endif
158 }
159
160 /* check what broke the loop */
161 if (ferror(gf))
162 err(EX_IOERR, "%s: line %d", gfn, n);
163
164 /* done */
165 fclose(gf);
166 if (e == 0)
167 printf("%s is fine\n", gfn);
168 exit(e ? EX_DATAERR : EX_OK);
169 }
170