diff options
Diffstat (limited to 'usr.sbin/chkgrp/chkgrp.c')
| -rw-r--r-- | usr.sbin/chkgrp/chkgrp.c | 193 |
1 files changed, 193 insertions, 0 deletions
diff --git a/usr.sbin/chkgrp/chkgrp.c b/usr.sbin/chkgrp/chkgrp.c new file mode 100644 index 000000000000..69eff6e7574d --- /dev/null +++ b/usr.sbin/chkgrp/chkgrp.c @@ -0,0 +1,193 @@ +/*- + * SPDX-License-Identifier: BSD-3-Clause + * + * Copyright (c) 1998 Dag-Erling Smørgrav + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer + * in this position and unchanged. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * 3. The name of the author may not be used to endorse or promote products + * derived from this software without specific prior written permission + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR + * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES + * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. + * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, + * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT + * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, + * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY + * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT + * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF + * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. + */ + +#include <sys/cdefs.h> +#include <err.h> +#include <errno.h> +#include <ctype.h> +#include <inttypes.h> +#include <limits.h> +#include <stdint.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <unistd.h> +#include <sysexits.h> + +static void __dead2 +usage(void) +{ + + fprintf(stderr, "usage: chkgrp [-q] [groupfile]\n"); + exit(EX_USAGE); +} + +int +main(int argc, char *argv[]) +{ + FILE *gf; + unsigned long gid; + unsigned int i; + size_t len; + int opt, quiet; + int n = 0, k, e = 0; + const char *cp, *f[4], *gfn, *p; + char *line; + + quiet = 0; + while ((opt = getopt(argc, argv, "q")) != -1) { + switch (opt) { + case 'q': + quiet = 1; + break; + default: + usage(); + } + } + + argc -= optind; + argv += optind; + + if (argc == 0) + gfn = "/etc/group"; + else if (argc == 1) + gfn = argv[0]; + else + usage(); + + /* open group file */ + if ((gf = fopen(gfn, "r")) == NULL) + err(EX_NOINPUT, "%s", gfn); + + /* check line by line */ + while (++n) { + if ((line = fgetln(gf, &len)) == NULL) + break; + if (len > 0 && line[len - 1] != '\n') { + warnx("%s: line %d: no newline character", gfn, n); + e = 1; + } + while (len && isspace(line[len-1])) + len--; + + /* ignore blank lines and comments */ + for (p = line; p < line + len; p++) + if (!isspace(*p)) break; + if (!len || *p == '#') + continue; + + /* + * Hack: special case for + line + */ + if (strncmp(line, "+:::", len) == 0 || + strncmp(line, "+:*::", len) == 0) + continue; + + /* + * A correct group entry has four colon-separated fields, + * the third of which must be entirely numeric and the + * fourth of which may be empty. + */ + for (i = k = 0; k < 4; k++) { + for (f[k] = line + i; i < len && line[i] != ':'; i++) + /* nothing */ ; + if (k < 3 && line[i] != ':') + break; + line[i++] = 0; + } + + if (k < 4) { + warnx("%s: line %d: missing field(s)", gfn, n); + while (k < 4) + f[k++] = ""; + e = 1; + } + + for (cp = f[0] ; *cp ; cp++) { + if (!isalnum(*cp) && *cp != '.' && *cp != '_' && + *cp != '-' && (cp > f[0] || *cp != '+')) { + warnx("%s: line %d: '%c' invalid character", + gfn, n, *cp); + e = 1; + } + } + + for (cp = f[3] ; *cp ; cp++) { + if (!isalnum(*cp) && *cp != '.' && *cp != '_' && + *cp != '-' && *cp != ',') { + warnx("%s: line %d: '%c' invalid character", + gfn, n, *cp); + e = 1; + } + } + + /* check if fourth field ended with a colon */ + if (i < len) { + warnx("%s: line %d: too many fields", gfn, n); + e = 1; + } + + /* check that none of the fields contain whitespace */ + for (k = 0; k < 4; k++) { + if (strcspn(f[k], " \t") != strlen(f[k])) { + warnx("%s: line %d: field %d contains whitespace", + gfn, n, k+1); + e = 1; + } + } + + /* check that the GID is numeric */ + if (strspn(f[2], "0123456789") != strlen(f[2])) { + warnx("%s: line %d: group id is not numeric", gfn, n); + e = 1; + } + + /* check the range of the group id */ + errno = 0; + gid = strtoul(f[2], NULL, 10); + if (errno != 0) { + warnx("%s: line %d: strtoul failed", gfn, n); + } else if (gid > GID_MAX) { + warnx("%s: line %d: group id is too large (%ju > %ju)", + gfn, n, (uintmax_t)gid, (uintmax_t)GID_MAX); + e = 1; + } + } + + /* check what broke the loop */ + if (ferror(gf)) + err(EX_IOERR, "%s: line %d", gfn, n); + + /* done */ + fclose(gf); + if (e == 0 && quiet == 0) + printf("%s is fine\n", gfn); + exit(e ? EX_DATAERR : EX_OK); +} |