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 1.5 2005/08/04 13:10:25 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 (cp > f[0] || *cp != '+')) { 115 warnx("%s: line %d: '%c' invalid character", gfn, n, *cp); 116 e++; 117 } 118 } 119 120 for (cp = f[3] ; *cp ; cp++) { 121 if (!isalnum(*cp) && *cp != ',' && *cp != '.' && *cp != '_' && *cp != '-') { 122 warnx("%s: line %d: '%c' invalid character", gfn, n, *cp); 123 e++; 124 } 125 } 126 127 if (k < 4) { 128 warnx("%s: line %d: missing field(s)", gfn, n); 129 e++; 130 } 131 132 /* check if fourth field ended with a colon */ 133 if (i < (int)len) { 134 warnx("%s: line %d: too many fields", gfn, n); 135 e++; 136 } 137 /* check that none of the fields contain whitespace */ 138 for (k = 0; k < 4; k++) { 139 if (strcspn(f[k], " \t") != strlen(f[k])) { 140 warnx("%s: line %d: field %d contains whitespace", 141 gfn, n, k + 1); 142 e++; 143 } 144 } 145 146 /* check that the GID is numeric */ 147 if (strspn(f[2], "0123456789") != strlen(f[2])) { 148 warnx("%s: line %d: GID is not numeric", gfn, n); 149 e++; 150 } 151 #if 0 152 /* entry is correct, so print it */ 153 printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]); 154 #endif 155 } 156 157 /* check what broke the loop */ 158 if (ferror(gf)) 159 err(EX_IOERR, "%s: line %d", gfn, n); 160 161 /* done */ 162 fclose(gf); 163 if (e == 0) 164 printf("%s is fine\n", gfn); 165 exit(e ? EX_DATAERR : EX_OK); 166 } 167