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 1.2 2003/06/17 04:29:52 dillon Exp $ 30 */ 31 32 #include <err.h> 33 #include <ctype.h> 34 #include <stdio.h> 35 #include <string.h> 36 #include <sysexits.h> 37 38 void 39 usage(void) 40 { 41 fprintf(stderr, "usage: chkgrp [groupfile]\n"); 42 exit(EX_USAGE); 43 } 44 45 int 46 main(int argc, char *argv[]) 47 { 48 size_t len; 49 int n = 0, i, k, e = 0; 50 char *gfn, *line, *f[4], *p; 51 FILE *gf; 52 53 /* check arguments */ 54 switch (argc) { 55 case 1: 56 gfn = "/etc/group"; 57 break; 58 case 2: 59 gfn = argv[1]; 60 break; 61 default: 62 gfn = NULL; /* silence compiler */ 63 usage(); 64 } 65 66 /* open group file */ 67 if ((gf = fopen(gfn, "r")) == NULL) 68 err(EX_IOERR, "%s", gfn); /* XXX - is IO_ERR the correct exit code? */ 69 70 /* check line by line */ 71 while (++n) { 72 if ((line = fgetln(gf, &len)) == NULL) 73 break; 74 while (len && isspace(line[len-1])) 75 len--; 76 77 /* ignore blank lines and comments */ 78 for (p = line; p < (line + len); p++) 79 if (!isspace(*p)) break; 80 if (!len || (*p == '#')) { 81 #if 0 82 /* entry is correct, so print it */ 83 printf("%*.*s\n", len, len, line); 84 #endif 85 continue; 86 } 87 88 /* 89 * A correct group entry has four colon-separated fields, the third 90 * of which must be entirely numeric and the fourth of which may 91 * be empty. 92 */ 93 for (i = k = 0; k < 4; k++) { 94 for (f[k] = line+i; (i < len) && (line[i] != ':'); i++) 95 /* nothing */ ; 96 if ((k < 3) && (line[i] != ':')) 97 break; 98 line[i++] = 0; 99 } 100 if (k < 4) { 101 warnx("%s: line %d: missing field(s)", gfn, n); 102 e++; 103 continue; 104 } 105 106 /* check if fourth field ended with a colon */ 107 if (i < len) { 108 warnx("%s: line %d: too many fields", gfn, n); 109 e++; 110 continue; 111 } 112 113 /* check that none of the fields contain whitespace */ 114 for (k = 0; k < 4; k++) 115 if (strcspn(f[k], " \t") != strlen(f[k])) 116 warnx("%s: line %d: field %d contains whitespace", 117 gfn, n, k+1); 118 119 /* check that the GID is numeric */ 120 if (strspn(f[2], "0123456789") != strlen(f[2])) { 121 warnx("%s: line %d: GID is not numeric", gfn, n); 122 e++; 123 continue; 124 } 125 126 #if 0 127 /* entry is correct, so print it */ 128 printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]); 129 #endif 130 } 131 132 /* check what broke the loop */ 133 if (ferror(gf)) 134 err(EX_IOERR, "%s: line %d", gfn, n); 135 136 /* done */ 137 fclose(gf); 138 exit(e ? EX_DATAERR : EX_OK); 139 } 140