+++ /dev/null
-/*
- * libxt_time - iptables part for xt_time
- * Copyright © CC Computer Consultants GmbH, 2007
- * Contact: <jengelh@computergmbh.de>
- *
- * libxt_time.c is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 or 3 of the License.
- *
- * Based on libipt_time.c.
- */
-#include <sys/types.h>
-#include <getopt.h>
-#include <stdbool.h>
-#include <stdio.h>
-#include <string.h>
-#include <stdlib.h>
-#include <stddef.h>
-#include <time.h>
-#include <linux/netfilter/xt_time.h>
-#include <xtables.h>
-#define ARRAY_SIZE(x) (sizeof(x) / sizeof(*x))
-
-enum { /* getopt "seen" bits */
- F_DATE_START = 1 << 0,
- F_DATE_STOP = 1 << 1,
- F_TIME_START = 1 << 2,
- F_TIME_STOP = 1 << 3,
- F_MONTHDAYS = 1 << 4,
- F_WEEKDAYS = 1 << 5,
- F_TIMEZONE = 1 << 6,
-};
-
-static const char *const week_days[] = {
- NULL, "Mon", "Tue", "Wed", "Thu", "Fri", "Sat", "Sun",
-};
-
-static const struct option time_opts[] = {
- {"datestart", true, NULL, 'D'},
- {"datestop", true, NULL, 'E'},
- {"timestart", true, NULL, 'X'},
- {"timestop", true, NULL, 'Y'},
- {"weekdays", true, NULL, 'w'},
- {"monthdays", true, NULL, 'm'},
- {"localtz", false, NULL, 'l'},
- {"utc", false, NULL, 'u'},
- { .name = NULL }
-};
-
-static void time_help(void)
-{
- printf(
-"time match options:\n"
-" --datestart time Start and stop time, to be given in ISO 8601\n"
-" --datestop time (YYYY[-MM[-DD[Thh[:mm[:ss]]]]])\n"
-" --timestart time Start and stop daytime (hh:mm[:ss])\n"
-" --timestop time (between 00:00:00 and 23:59:59)\n"
-"[!] --monthdays value List of days on which to match, separated by comma\n"
-" (Possible days: 1 to 31; defaults to all)\n"
-"[!] --weekdays value List of weekdays on which to match, sep. by comma\n"
-" (Possible days: Mon,Tue,Wed,Thu,Fri,Sat,Sun or 1 to 7\n"
-" Defaults to all weekdays.)\n"
-" --localtz/--utc Time is interpreted as UTC/local time\n");
-}
-
-static void time_init(struct xt_entry_match *m)
-{
- struct xt_time_info *info = (void *)m->data;
-
- /* By default, we match on every day, every daytime */
- info->monthdays_match = XT_TIME_ALL_MONTHDAYS;
- info->weekdays_match = XT_TIME_ALL_WEEKDAYS;
- info->daytime_start = XT_TIME_MIN_DAYTIME;
- info->daytime_stop = XT_TIME_MAX_DAYTIME;
-
- /* ...and have no date-begin or date-end boundary */
- info->date_start = 0;
- info->date_stop = INT_MAX;
-
- /* local time is default */
- info->flags |= XT_TIME_LOCAL_TZ;
-}
-
-static time_t time_parse_date(const char *s, bool end)
-{
- unsigned int month = 1, day = 1, hour = 0, minute = 0, second = 0;
- unsigned int year = end ? 2038 : 1970;
- const char *os = s;
- struct tm tm;
- time_t ret;
- char *e;
-
- year = strtoul(s, &e, 10);
- if ((*e != '-' && *e != '\0') || year < 1970 || year > 2038)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- month = strtoul(s, &e, 10);
- if ((*e != '-' && *e != '\0') || month > 12)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- day = strtoul(s, &e, 10);
- if ((*e != 'T' && *e != '\0') || day > 31)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- hour = strtoul(s, &e, 10);
- if ((*e != ':' && *e != '\0') || hour > 23)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- minute = strtoul(s, &e, 10);
- if ((*e != ':' && *e != '\0') || minute > 59)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- second = strtoul(s, &e, 10);
- if (*e != '\0' || second > 59)
- goto out;
-
- eval:
- tm.tm_year = year - 1900;
- tm.tm_mon = month - 1;
- tm.tm_mday = day;
- tm.tm_hour = hour;
- tm.tm_min = minute;
- tm.tm_sec = second;
- ret = mktime(&tm);
- if (ret >= 0)
- return ret;
- perror("mktime");
- exit_error(OTHER_PROBLEM, "mktime returned an error");
-
- out:
- exit_error(PARAMETER_PROBLEM, "Invalid date \"%s\" specified. Should "
- "be YYYY[-MM[-DD[Thh[:mm[:ss]]]]]", os);
- return -1;
-}
-
-static unsigned int time_parse_minutes(const char *s)
-{
- unsigned int hour, minute, second = 0;
- char *e;
-
- hour = strtoul(s, &e, 10);
- if (*e != ':' || hour > 23)
- goto out;
-
- s = e + 1;
- minute = strtoul(s, &e, 10);
- if ((*e != ':' && *e != '\0') || minute > 59)
- goto out;
- if (*e == '\0')
- goto eval;
-
- s = e + 1;
- second = strtoul(s, &e, 10);
- if (*e != '\0' || second > 59)
- goto out;
-
- eval:
- return 60 * 60 * hour + 60 * minute + second;
-
- out:
- exit_error(PARAMETER_PROBLEM, "invalid time \"%s\" specified, "
- "should be hh:mm[:ss] format and within the boundaries", s);
- return -1;
-}
-
-static const char *my_strseg(char *buf, unsigned int buflen,
- const char **arg, char delim)
-{
- const char *sep;
-
- if (*arg == NULL || **arg == '\0')
- return NULL;
- sep = strchr(*arg, delim);
- if (sep == NULL) {
- snprintf(buf, buflen, "%s", *arg);
- *arg = NULL;
- return buf;
- }
- snprintf(buf, buflen, "%.*s", (unsigned int)(sep - *arg), *arg);
- *arg = sep + 1;
- return buf;
-}
-
-static uint32_t time_parse_monthdays(const char *arg)
-{
- char day[3], *err = NULL;
- uint32_t ret = 0;
- unsigned int i;
-
- while (my_strseg(day, sizeof(day), &arg, ',') != NULL) {
- i = strtoul(day, &err, 0);
- if ((*err != ',' && *err != '\0') || i > 31)
- exit_error(PARAMETER_PROBLEM,
- "%s is not a valid day for --monthdays", day);
- ret |= 1 << i;
- }
-
- return ret;
-}
-
-static unsigned int time_parse_weekdays(const char *arg)
-{
- char day[4], *err = NULL;
- unsigned int i, ret = 0;
- bool valid;
-
- while (my_strseg(day, sizeof(day), &arg, ',') != NULL) {
- i = strtoul(day, &err, 0);
- if (*err == '\0') {
- if (i == 0)
- exit_error(PARAMETER_PROBLEM,
- "No, the week does NOT begin with Sunday.");
- ret |= 1 << i;
- continue;
- }
-
- valid = false;
- for (i = 1; i < ARRAY_SIZE(week_days); ++i)
- if (strncmp(day, week_days[i], 2) == 0) {
- ret |= 1 << i;
- valid = true;
- }
-
- if (!valid)
- exit_error(PARAMETER_PROBLEM,
- "%s is not a valid day specifier", day);
- }
-
- return ret;
-}
-
-static int time_parse(int c, char **argv, int invert, unsigned int *flags,
- const void *entry, struct xt_entry_match **match)
-{
- struct xt_time_info *info = (void *)(*match)->data;
-
- switch (c) {
- case 'D': /* --datestart */
- if (*flags & F_DATE_START)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --datestart twice");
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "Unexpected \"!\" with --datestart");
- info->date_start = time_parse_date(optarg, false);
- *flags |= F_DATE_START;
- return 1;
- case 'E': /* --datestop */
- if (*flags & F_DATE_STOP)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --datestop more than once");
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "unexpected \"!\" with --datestop");
- info->date_stop = time_parse_date(optarg, true);
- *flags |= F_DATE_STOP;
- return 1;
- case 'X': /* --timestart */
- if (*flags & F_TIME_START)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --timestart more than once");
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "Unexpected \"!\" with --timestart");
- info->daytime_start = time_parse_minutes(optarg);
- *flags |= F_TIME_START;
- return 1;
- case 'Y': /* --timestop */
- if (*flags & F_TIME_STOP)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --timestop more than once");
- if (invert)
- exit_error(PARAMETER_PROBLEM,
- "Unexpected \"!\" with --timestop");
- info->daytime_stop = time_parse_minutes(optarg);
- *flags |= F_TIME_STOP;
- return 1;
- case 'l': /* --localtz */
- if (*flags & F_TIMEZONE)
- exit_error(PARAMETER_PROBLEM,
- "Can only specify exactly one of --localtz or --utc");
- info->flags |= XT_TIME_LOCAL_TZ;
- *flags |= F_TIMEZONE;
- return 1;
- case 'm': /* --monthdays */
- if (*flags & F_MONTHDAYS)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --monthdays more than once");
- info->monthdays_match = time_parse_monthdays(optarg);
- if (invert)
- info->monthdays_match ^= XT_TIME_ALL_MONTHDAYS;
- *flags |= F_MONTHDAYS;
- return 1;
- case 'w': /* --weekdays */
- if (*flags & F_WEEKDAYS)
- exit_error(PARAMETER_PROBLEM,
- "Cannot specify --weekdays more than once");
- info->weekdays_match = time_parse_weekdays(optarg);
- if (invert)
- info->weekdays_match ^= XT_TIME_ALL_WEEKDAYS;
- *flags |= F_WEEKDAYS;
- return 1;
- case 'u': /* --utc */
- if (*flags & F_TIMEZONE)
- exit_error(PARAMETER_PROBLEM,
- "Can only specify exactly one of --localtz or --utc");
- info->flags &= ~XT_TIME_LOCAL_TZ;
- *flags |= F_TIMEZONE;
- return 1;
- }
- return 0;
-}
-
-static void time_print_date(time_t date, const char *command)
-{
- struct tm *t;
-
- /* If it is the default value, do not print it. */
- if (date == 0 || date == LONG_MAX)
- return;
-
- t = localtime(&date);
- if (command != NULL)
- /*
- * Need a contiguous string (no whitespaces), hence using
- * the ISO 8601 "T" variant.
- */
- printf("%s %04u-%02u-%02uT%02u:%02u:%02u ",
- command, t->tm_year + 1900, t->tm_mon + 1,
- t->tm_mday, t->tm_hour, t->tm_min, t->tm_sec);
- else
- printf("%04u-%02u-%02u %02u:%02u:%02u ",
- t->tm_year + 1900, t->tm_mon + 1, t->tm_mday,
- t->tm_hour, t->tm_min, t->tm_sec);
-}
-
-static void time_print_monthdays(uint32_t mask, bool human_readable)
-{
- unsigned int i, nbdays = 0;
-
- for (i = 1; i <= 31; ++i)
- if (mask & (1 << i)) {
- if (nbdays++ > 0)
- printf(",");
- printf("%u", i);
- if (human_readable)
- switch (i % 10) {
- case 1:
- printf("st");
- break;
- case 2:
- printf("nd");
- break;
- case 3:
- printf("rd");
- break;
- default:
- printf("th");
- break;
- }
- }
- printf(" ");
-}
-
-static void time_print_weekdays(unsigned int mask)
-{
- unsigned int i, nbdays = 0;
-
- for (i = 1; i <= 7; ++i)
- if (mask & (1 << i)) {
- if (nbdays > 0)
- printf(",%s", week_days[i]);
- else
- printf("%s", week_days[i]);
- ++nbdays;
- }
- printf(" ");
-}
-
-static inline void divide_time(unsigned int fulltime, unsigned int *hours,
- unsigned int *minutes, unsigned int *seconds)
-{
- *seconds = fulltime % 60;
- fulltime /= 60;
- *minutes = fulltime % 60;
- *hours = fulltime / 60;
-}
-
-static void time_print(const void *ip, const struct xt_entry_match *match,
- int numeric)
-{
- struct xt_time_info *info = (void *)match->data;
- unsigned int h, m, s;
-
- printf("TIME ");
-
- if (info->daytime_start != XT_TIME_MIN_DAYTIME ||
- info->daytime_stop != XT_TIME_MAX_DAYTIME) {
- divide_time(info->daytime_start, &h, &m, &s);
- printf("from %02u:%02u:%02u ", h, m, s);
- divide_time(info->daytime_stop, &h, &m, &s);
- printf("to %02u:%02u:%02u ", h, m, s);
- }
- if (info->weekdays_match != XT_TIME_ALL_WEEKDAYS) {
- printf("on ");
- time_print_weekdays(info->weekdays_match);
- }
- if (info->monthdays_match != XT_TIME_ALL_MONTHDAYS) {
- printf("on ");
- time_print_monthdays(info->monthdays_match, true);
- }
- if (info->date_start != 0) {
- printf("starting from ");
- time_print_date(info->date_start, NULL);
- }
- if (info->date_stop != INT_MAX) {
- printf("until date ");
- time_print_date(info->date_stop, NULL);
- }
- if (!(info->flags & XT_TIME_LOCAL_TZ))
- printf("UTC ");
-}
-
-static void time_save(const void *ip, const struct xt_entry_match *match)
-{
- const struct xt_time_info *info = (const void *)match->data;
- unsigned int h, m, s;
-
- if (info->daytime_start != XT_TIME_MIN_DAYTIME ||
- info->daytime_stop != XT_TIME_MAX_DAYTIME) {
- divide_time(info->daytime_start, &h, &m, &s);
- printf("--timestart %02u:%02u:%02u ", h, m, s);
- divide_time(info->daytime_stop, &h, &m, &s);
- printf("--timestop %02u:%02u:%02u ", h, m, s);
- }
- if (info->monthdays_match != XT_TIME_ALL_MONTHDAYS) {
- printf("--monthdays ");
- time_print_monthdays(info->monthdays_match, false);
- }
- if (info->weekdays_match != XT_TIME_ALL_WEEKDAYS) {
- printf("--weekdays ");
- time_print_weekdays(info->weekdays_match);
- printf(" ");
- }
- time_print_date(info->date_start, "--datestart");
- time_print_date(info->date_stop, "--datestop");
- if (!(info->flags & XT_TIME_LOCAL_TZ))
- printf("--utc ");
-}
-
-static struct xtables_match time_match = {
- .name = "time",
- .family = AF_UNSPEC,
- .version = XTABLES_VERSION,
- .size = XT_ALIGN(sizeof(struct xt_time_info)),
- .userspacesize = XT_ALIGN(sizeof(struct xt_time_info)),
- .help = time_help,
- .init = time_init,
- .parse = time_parse,
- .print = time_print,
- .save = time_save,
- .extra_opts = time_opts,
-};
-
-void _init(void)
-{
- xtables_register_match(&time_match);
-}
git://git.onelab.eu / iptables.git / blobdiff