xref: /dragonfly/usr.sbin/chkgrp/chkgrp.c (revision 2ee85085)
1 /*-
2  * Copyright (c) 1998 Dag-Erling Co�dan Sm�rgrav
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 1.4 2005/05/01 23:39:40 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 
44 static void
45 usage(void)
46 {
47 	fprintf(stderr, "usage: chkgrp [groupfile]\n");
48 	exit(EX_USAGE);
49 }
50 
51 int
52 main(int argc, char *argv[])
53 {
54 	size_t len;
55 	int n = 0, i, k, e = 0;
56 	char *line, *f[4], *p;
57 	const char *cp, *gfn;
58 	FILE *gf;
59 
60 	/* check arguments */
61 	switch (argc) {
62 	case 1:
63 		gfn = DEFAULTGFILE;
64 		break;
65 	case 2:
66 		gfn = argv[1];
67 		break;
68 	default:
69 		gfn = NULL;	/* silence compiler */
70 		usage();
71 	}
72 
73 	/* open group file */
74 	if ((gf = fopen(gfn, "r")) == NULL)
75 		err(EX_IOERR, "%s", gfn);
76 
77 	/* check line by line */
78 	while (++n) {
79 		if ((line = fgetln(gf, &len)) == NULL)
80 			break;
81 		if (len > 0 && line[len - 1] != '\n') {
82 			warnx("%s: line %d: no newline character", gfn, n);
83 			e++;
84 		}
85 		while (len && isspace(line[len - 1]))
86 			len--;
87 
88 		/* ignore blank lines and comments */
89 		for (p = line; p < (line + len); p++)
90 			if (!isspace(*p))
91 				break;
92 		if (!len || (*p == '#')) {
93 #if 0
94 			/* entry is correct, so print it */
95 			printf("%*.*s\n", len, len, line);
96 #endif
97 			continue;
98 		}
99 		/*
100 		 * A correct group entry has four colon-separated fields, the
101 		 * third of which must be entirely numeric and the fourth of
102 		 * which may be empty. We also check for any incorrect characters.
103 		 */
104 		for (i = k = 0; k < 4; k++) {
105 			for (f[k] = line + i; (i < (int)len) && (line[i] != ':'); i++)
106 				 /* nothing */ ;
107 			if ((k < 3) && (line[i] != ':'))
108 				break;
109 			line[i++] = 0;
110 		}
111 
112 		for (cp = f[0] ; *cp ; cp++) {
113 			if (!isalnum(*cp) && *cp != '.' && *cp != '_' && *cp != '-') {
114 				warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
115 				e++;
116 			}
117 		}
118 
119 		for (cp = f[3] ; *cp ; cp++) {
120 			if (!isalnum(*cp) && *cp != ',' && *cp != '.' && *cp != '_' && *cp != '-') {
121 				warnx("%s: line %d: '%c' invalid character", gfn, n, *cp);
122 				e++;
123 			}
124 		}
125 
126 		if (k < 4) {
127 			warnx("%s: line %d: missing field(s)", gfn, n);
128 			e++;
129 		}
130 
131 		/* check if fourth field ended with a colon */
132 		if (i < (int)len) {
133 			warnx("%s: line %d: too many fields", gfn, n);
134 			e++;
135 		}
136 		/* check that none of the fields contain whitespace */
137 		for (k = 0; k < 4; k++) {
138 			if (strcspn(f[k], " \t") != strlen(f[k])) {
139 				warnx("%s: line %d: field %d contains whitespace",
140 				      gfn, n, k + 1);
141 				e++;
142 			}
143 		}
144 
145 		/* check that the GID is numeric */
146 		if (strspn(f[2], "0123456789") != strlen(f[2])) {
147 			warnx("%s: line %d: GID is not numeric", gfn, n);
148 			e++;
149 		}
150 #if 0
151 		/* entry is correct, so print it */
152 		printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]);
153 #endif
154 	}
155 
156 	/* check what broke the loop */
157 	if (ferror(gf))
158 		err(EX_IOERR, "%s: line %d", gfn, n);
159 
160 	/* done */
161 	fclose(gf);
162 	if (e == 0)
163 		printf("%s is fine\n", gfn);
164 	exit(e ? EX_DATAERR : EX_OK);
165 }
166