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 29 #ifndef lint 30 static const char rcsid[] = 31 "$FreeBSD$"; 32 #endif /* not lint */ 33 34 #include <err.h> 35 #include <ctype.h> 36 #include <stdio.h> 37 #include <string.h> 38 #include <sysexits.h> 39 40 void 41 usage(void) 42 { 43 fprintf(stderr, "usage: chkgrp [groupfile]\n"); 44 exit(EX_USAGE); 45 } 46 47 int 48 main(int argc, char *argv[]) 49 { 50 unsigned int len; 51 int n = 0, i, k, e = 0; 52 char *gfn, *line, *f[4], *p; 53 FILE *gf; 54 55 /* check arguments */ 56 switch (argc) { 57 case 1: 58 gfn = "/etc/group"; 59 break; 60 case 2: 61 gfn = argv[1]; 62 break; 63 default: 64 gfn = NULL; /* silence compiler */ 65 usage(); 66 } 67 68 /* open group file */ 69 if ((gf = fopen(gfn, "r")) == NULL) 70 err(EX_IOERR, gfn); /* XXX - is IO_ERR the correct exit code? */ 71 72 /* check line by line */ 73 while (++n) { 74 if ((line = fgetln(gf, &len)) == NULL) 75 break; 76 while (len && isspace(line[len-1])) 77 len--; 78 79 /* ignore blank lines and comments */ 80 for (p = line; p < (line + len); p++) 81 if (!isspace(*p)) break; 82 if (!len || (*p == '#')) { 83 #if 0 84 /* entry is correct, so print it */ 85 printf("%*.*s\n", len, len, line); 86 #endif 87 continue; 88 } 89 90 /* 91 * A correct group entry has four colon-separated fields, the third 92 * of which must be entirely numeric and the fourth of which may 93 * be empty. 94 */ 95 for (i = k = 0; k < 4; k++) { 96 for (f[k] = line+i; (i < len) && (line[i] != ':'); i++) 97 /* nothing */ ; 98 if ((k < 3) && (line[i] != ':')) 99 break; 100 line[i++] = 0; 101 } 102 if (k < 4) { 103 warnx("%s: line %d: missing field(s)", gfn, n); 104 e++; 105 continue; 106 } 107 108 /* check if fourth field ended with a colon */ 109 if (i < len) { 110 warnx("%s: line %d: too many fields", gfn, n); 111 e++; 112 continue; 113 } 114 115 /* check that none of the fields contain whitespace */ 116 for (k = 0; k < 4; k++) 117 if (strcspn(f[k], " \t") != strlen(f[k])) 118 warnx("%s: line %d: field %d contains whitespace", 119 gfn, n, k+1); 120 121 /* check that the GID is numeric */ 122 if (strspn(f[2], "0123456789") != strlen(f[2])) { 123 warnx("%s: line %d: GID is not numeric", gfn, n); 124 e++; 125 continue; 126 } 127 128 #if 0 129 /* entry is correct, so print it */ 130 printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]); 131 #endif 132 } 133 134 /* check what broke the loop */ 135 if (ferror(gf)) 136 err(EX_IOERR, "%s: line %d", gfn, n); 137 138 /* done */ 139 fclose(gf); 140 exit(e ? EX_DATAERR : EX_OK); 141 } 142