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https://github.com/pygos/init.git
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507 lines
9.7 KiB
C
507 lines
9.7 KiB
C
/* SPDX-License-Identifier: GPL-3.0-or-later */
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/*
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* Copyright (C) 2018 - David Oberhollenzer
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*
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* This program is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <https://www.gnu.org/licenses/>.
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*/
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#include <sys/types.h>
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#include <sys/stat.h>
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#include <unistd.h>
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#include <string.h>
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#include <stdlib.h>
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#include <limits.h>
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#include <stdio.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <ctype.h>
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#include <pwd.h>
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#include <grp.h>
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#include "crontab.h"
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#include "libcfg.h"
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#include "util.h"
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static const enum_map_t weekday[] = {
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{ "MON", 1 },
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{ "TUE", 2 },
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{ "WED", 3 },
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{ "THU", 4 },
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{ "FRI", 5 },
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{ "SAT", 6 },
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{ "SUN", 0 },
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};
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static const enum_map_t month[] = {
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{ "JAN", 1 },
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{ "FEB", 2 },
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{ "MAR", 3 },
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{ "APR", 4 },
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{ "MAY", 5 },
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{ "JUN", 6 },
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{ "JUL", 7 },
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{ "AUG", 8 },
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{ "SEP", 9 },
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{ "OCT", 10 },
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{ "NOV", 11 },
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{ "DEC", 12 },
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};
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static const struct {
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const char *macro;
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crontab_t tab;
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} intervals[] = {
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{
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.macro = "yearly",
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.tab = {
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.minute = 0x01,
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.hour = 0x01,
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.dayofmonth = 0x01,
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.month = 0x01,
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.dayofweek = 0xFF
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},
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}, {
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.macro = "annually",
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.tab = {
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.minute = 0x01,
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.hour = 0x01,
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.dayofmonth = 0x01,
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.month = 0x01,
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.dayofweek = 0xFF
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},
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}, {
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.macro = "monthly",
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.tab = {
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.minute = 0x01,
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.hour = 0x01,
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.dayofmonth = 0x01,
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.month = 0xFFFF,
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.dayofweek = 0xFF
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},
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}, {
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.macro = "weekly",
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.tab = {
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.minute = 0x01,
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.hour = 0x01,
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.dayofmonth = 0xFFFFFFFF,
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.month = 0xFFFF,
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.dayofweek = 0x01
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},
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}, {
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.macro = "daily",
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.tab = {
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.minute = 0x01,
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.hour = 0x01,
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.dayofmonth = 0xFFFFFFFF,
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.month = 0xFFFF,
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.dayofweek = 0xFF
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},
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}, {
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.macro = "hourly",
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.tab = {
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.minute = 0x01,
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.hour = 0xFFFFFFFF,
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.dayofmonth = 0xFFFFFFFF,
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.month = 0xFFFF,
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.dayofweek = 0xFF
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},
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},
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};
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/*****************************************************************************/
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static int try_unescape(char *arg, rdline_t *rd)
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{
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if (unescape(arg)) {
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fprintf(stderr, "%s: %zu: malformed string constant\n",
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rd->filename, rd->lineno);
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return -1;
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}
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return 0;
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}
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static char *try_strdup(const char *str, rdline_t *rd)
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{
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char *out = strdup(str);
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if (out == NULL) {
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fprintf(stderr, "%s: %zu: out of memory\n",
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rd->filename, rd->lineno);
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}
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return out;
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}
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static char *readnum(char *line, int *out, int minval, int maxval,
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const enum_map_t *mnemonic, rdline_t *rd)
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{
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int i, temp, value = 0;
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const enum_map_t *ev;
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if (!isdigit(*line)) {
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if (!mnemonic)
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goto fail_mn;
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for (i = 0; isalnum(line[i]); ++i)
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;
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if (i == 0)
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goto fail_mn;
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temp = line[i];
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line[i] = '\0';
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ev = enum_by_name(mnemonic, line);
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if (!ev) {
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fprintf(stderr, "%s: %zu: unexpected '%s'",
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rd->filename, rd->lineno, line);
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}
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line[i] = temp;
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if (!ev)
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return NULL;
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*out = ev->value;
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return line + i;
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}
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while (isdigit(*line)) {
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i = ((*(line++)) - '0');
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if (value > (maxval - i) / 10)
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goto fail_of;
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value = value * 10 + i;
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}
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if (value < minval)
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goto fail_uf;
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*out = value;
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return line;
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fail_of:
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fprintf(stderr, "%s: %zu: value exceeds maximum (%d > %d)\n",
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rd->filename, rd->lineno, value, maxval);
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return NULL;
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fail_uf:
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fprintf(stderr, "%s: %zu: value too small (%d < %d)\n",
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rd->filename, rd->lineno, value, minval);
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return NULL;
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fail_mn:
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fprintf(stderr, "%s: %zu: expected numeric value",
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rd->filename, rd->lineno);
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return NULL;
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}
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static char *readfield(char *line, uint64_t *out, int minval, int maxval,
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const enum_map_t *mnemonic, rdline_t *rd)
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{
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int value, endvalue, step;
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uint64_t v = 0;
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next:
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if (*line == '*') {
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++line;
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value = minval;
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endvalue = maxval;
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} else {
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line = readnum(line, &value, minval, maxval, mnemonic, rd);
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if (!line)
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goto fail;
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if (*line == '-') {
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line = readnum(line + 1, &endvalue, minval, maxval,
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mnemonic, rd);
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if (!line)
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goto fail;
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} else {
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endvalue = value;
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}
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}
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if (endvalue < value)
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goto fail;
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if (*line == '/') {
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line = readnum(line + 1, &step, 1, maxval + 1, NULL, rd);
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if (!line)
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goto fail;
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} else {
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step = 1;
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}
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while (value <= endvalue) {
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v |= 1UL << (unsigned long)(value - minval);
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value += step;
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}
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if (*line == ',' || *line == ' ') {
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++line;
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goto next;
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}
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if (*line != '\0')
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goto fail;
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*out = v;
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return line;
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fail:
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fprintf(stderr, "%s: %zu: invalid time range expression\n",
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rd->filename, rd->lineno);
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return NULL;
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}
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/*****************************************************************************/
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static int cron_exec(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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exec_t *e, *end;
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(void)flags;
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e = calloc(1, sizeof(*e) + strlen(arg) + 1);
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if (e == NULL) {
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fprintf(stderr, "%s: %zu: out of memory\n",
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rd->filename, rd->lineno);
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return -1;
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}
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strcpy(e->args, arg);
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e->argc = pack_argv(e->args);
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if (e->argc < 0) {
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fprintf(stderr, "%s: %zu: malformed string constant\n",
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rd->filename, rd->lineno);
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return -1;
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}
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if (cron->exec == NULL) {
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cron->exec = e;
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} else {
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for (end = cron->exec; end->next != NULL; end = end->next)
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;
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end->next = e;
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}
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return 0;
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}
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static int cron_hour(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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uint64_t value;
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(void)flags;
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if (!readfield(arg, &value, 0, 23, NULL, rd))
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return -1;
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cron->hour = value;
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return 0;
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}
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static int cron_minute(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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uint64_t value;
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(void)flags;
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if (!readfield(arg, &value, 0, 59, NULL, rd))
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return -1;
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cron->minute = value;
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return 0;
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}
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static int cron_dayofmonth(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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uint64_t value;
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(void)flags;
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if (!readfield(arg, &value, 1, 31, NULL, rd))
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return -1;
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cron->dayofmonth = value;
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return 0;
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}
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static int cron_dayofweek(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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uint64_t value;
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(void)flags;
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if (!readfield(arg, &value, 0, 6, weekday, rd))
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return -1;
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cron->dayofweek = value;
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return 0;
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}
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static int cron_month(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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uint64_t value;
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(void)flags;
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if (!readfield(arg, &value, 1, 12, month, rd))
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return -1;
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cron->month = value;
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return 0;
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}
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static int cron_interval(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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size_t i;
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(void)flags;
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for (i = 0; i < ARRAY_SIZE(intervals); ++i) {
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if (!strcmp(intervals[i].macro, arg)) {
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cron->minute = intervals[i].tab.minute;
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cron->hour = intervals[i].tab.hour;
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cron->dayofmonth = intervals[i].tab.dayofmonth;
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cron->month = intervals[i].tab.month;
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cron->dayofweek = intervals[i].tab.dayofweek;
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return 0;
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}
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}
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fprintf(stderr, "%s: %zu: unknown interval '%s'\n",
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rd->filename, rd->lineno, arg);
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return -1;
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}
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static int cron_user(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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struct passwd *pwd;
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bool isnumeric;
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char *ptr;
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int value;
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(void)flags;
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for (ptr = arg; isdigit(*ptr); ++ptr)
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;
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isnumeric = (*ptr == '\0');
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pwd = getpwnam(arg);
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if (pwd == NULL && !isnumeric) {
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fprintf(stderr, "%s: %zu: unknown user '%s'\n",
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rd->filename, rd->lineno, arg);
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return -1;
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}
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if (pwd != NULL) {
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cron->uid = pwd->pw_uid;
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} else {
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if (readnum(arg, &value, 0, INT_MAX, NULL, rd))
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return -1;
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cron->uid = value;
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}
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return 0;
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}
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static int cron_group(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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struct group *group;
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bool isnumeric;
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char *ptr;
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int value;
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(void)flags;
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for (ptr = arg; isdigit(*ptr); ++ptr)
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;
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isnumeric = (*ptr == '\0');
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group = getgrnam(arg);
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if (group == NULL && !isnumeric) {
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fprintf(stderr, "%s: %zu: unknown group '%s'\n",
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rd->filename, rd->lineno, arg);
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return -1;
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}
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if (group != NULL) {
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cron->gid = group->gr_gid;
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} else {
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if (readnum(arg, &value, 0, INT_MAX, NULL, rd))
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return -1;
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cron->gid = value;
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}
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return 0;
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}
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static int cron_tty(void *user, char *arg, rdline_t *rd, int flags)
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{
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crontab_t *cron = user;
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(void)flags;
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if (strncmp(arg, "truncate", 8) == 0 && isspace(arg[8])) {
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cron->tty_truncate = 1;
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arg += 8;
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while (isspace(*arg))
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++arg;
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}
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if (try_unescape(arg, rd))
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return -1;
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cron->ctty = try_strdup(arg, rd);
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return cron->ctty == NULL ? -1 : 0;
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}
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static const cfg_param_t cron_params[] = {
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{ "hour", 0, cron_hour },
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{ "minute", 0, cron_minute },
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{ "dayofmonth", 0, cron_dayofmonth },
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{ "dayofweek", 0, cron_dayofweek },
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{ "month", 0, cron_month },
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{ "interval", 0, cron_interval },
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{ "user", 0, cron_user },
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{ "group", 0, cron_group },
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{ "tty", 0, cron_tty },
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{ "exec", 1, cron_exec },
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};
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crontab_t *rdcron(int dirfd, const char *filename)
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{
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crontab_t *cron;
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rdline_t rd;
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int fd, ret;
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fd = openat(dirfd, filename, O_RDONLY);
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if (fd < 0) {
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perror(filename);
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return NULL;
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}
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cron = calloc(1, sizeof(*cron));
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if (cron == NULL) {
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fputs("out of memory\n", stderr);
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goto out;
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}
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cron->minute = 0xFFFFFFFFFFFFFFFFUL;
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cron->hour = 0xFFFFFFFF;
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cron->dayofmonth = 0xFFFFFFFF;
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cron->month = 0xFFFF;
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cron->dayofweek = 0xFF;
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rdline_init(&rd, fd, filename, 0, NULL);
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ret = rdcfg(cron, &rd, cron_params, ARRAY_SIZE(cron_params), 0);
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if (ret) {
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delcron(cron);
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cron = NULL;
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}
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out:
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close(fd);
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return cron;
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}
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