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142 lines
3.8 KiB
C
142 lines
3.8 KiB
C
/*-
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* Copyright (c) 1998 Dag-Erling Coïdan Smørgrav
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer
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* in this position and unchanged.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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* 3. The name of the author may not be used to endorse or promote products
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* derived from this software without specific prior written permission
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef lint
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static const char rcsid[] =
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"$Id$";
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#endif /* not lint */
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#include <err.h>
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#include <ctype.h>
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#include <stdio.h>
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#include <string.h>
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#include <sysexits.h>
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void
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usage(void)
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{
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fprintf(stderr, "usage: chkgrp [groupfile]\n");
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exit(EX_USAGE);
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}
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int
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main(int argc, char *argv[])
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{
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unsigned int len;
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int n = 0, i, k, e = 0;
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char *gfn, *line, *f[4], *p;
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FILE *gf;
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/* check arguments */
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switch (argc) {
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case 1:
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gfn = "/etc/group";
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break;
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case 2:
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gfn = argv[1];
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break;
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default:
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gfn = NULL; /* silence compiler */
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usage();
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}
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/* open group file */
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if ((gf = fopen(gfn, "r")) == NULL)
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err(EX_IOERR, gfn); /* XXX - is IO_ERR the correct exit code? */
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/* check line by line */
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while (++n) {
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if ((line = fgetln(gf, &len)) == NULL)
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break;
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while (len && isspace(line[len-1]))
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len--;
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/* ignore blank lines and comments */
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for (p = line; p < (line + len); p++)
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if (!isspace(*p)) break;
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if (!len || (*p == '#')) {
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#if 0
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/* entry is correct, so print it */
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printf("%*.*s\n", len, len, line);
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#endif
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continue;
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}
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/*
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* A correct group entry has four colon-separated fields, the third
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* of which must be entirely numeric and the fourth of which may
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* be empty.
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*/
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for (i = k = 0; k < 4; k++) {
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for (f[k] = line+i; (i < len) && (line[i] != ':'); i++)
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/* nothing */ ;
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if ((k < 3) && (line[i] != ':'))
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break;
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line[i++] = 0;
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}
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if (k < 4) {
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warnx("%s: line %d: missing field(s)", gfn, n);
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e++;
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continue;
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}
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/* check if fourth field ended with a colon */
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if (i < len) {
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warnx("%s: line %d: too many fields", gfn, n);
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e++;
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continue;
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}
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/* check that none of the fields contain whitespace */
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for (k = 0; k < 4; k++)
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if (strcspn(f[k], " \t") != strlen(f[k]))
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warnx("%s: line %d: field %d contains whitespace",
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gfn, n, k+1);
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/* check that the GID is numeric */
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if (strspn(f[2], "0123456789") != strlen(f[2])) {
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warnx("%s: line %d: GID is not numeric", gfn, n);
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e++;
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continue;
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}
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#if 0
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/* entry is correct, so print it */
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printf("%s:%s:%s:%s\n", f[0], f[1], f[2], f[3]);
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#endif
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}
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/* check what broke the loop */
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if (ferror(gf))
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err(EX_IOERR, "%s: line %d", gfn, n);
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/* done */
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fclose(gf);
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exit(e ? EX_DATAERR : EX_OK);
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}
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