From 8d8896a3833292d091ee5a028f3461083bb956bd Mon Sep 17 00:00:00 2001 From: Florian Westphal Date: Mon, 17 Sep 2012 00:23:08 +0000 Subject: libxt_time: add support to ignore day transition Currently, if you want to do something like: "match Monday, starting 23:00, for two hours" You need two rules, one for Mon 23:00 to 0:00 and one for Tue 0:00-1:00. The rule --weekdays Mo --timestart 23:00 --timestop 01:00 looks correct, but it will first match on monday from midnight to 1 a.m. and then again for another hour from 23:00 onwards. This permits userspace to explicitly ignore the day transition and match for a single, continuous time period instead. Signed-off-by: Florian Westphal Signed-off-by: Pablo Neira Ayuso --- extensions/libxt_time.c | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'extensions/libxt_time.c') diff --git a/extensions/libxt_time.c b/extensions/libxt_time.c index 44c05b8f..9c5bda88 100644 --- a/extensions/libxt_time.c +++ b/extensions/libxt_time.c @@ -22,6 +22,7 @@ enum { O_DATE_STOP, O_TIME_START, O_TIME_STOP, + O_TIME_CONTIGUOUS, O_MONTHDAYS, O_WEEKDAYS, O_LOCAL_TZ, @@ -30,6 +31,7 @@ enum { F_LOCAL_TZ = 1 << O_LOCAL_TZ, F_UTC = 1 << O_UTC, F_KERNEL_TZ = 1 << O_KERNEL_TZ, + F_TIME_CONTIGUOUS = 1 << O_TIME_CONTIGUOUS, }; static const char *const week_days[] = { @@ -41,6 +43,7 @@ static const struct xt_option_entry time_opts[] = { {.name = "datestop", .id = O_DATE_STOP, .type = XTTYPE_STRING}, {.name = "timestart", .id = O_TIME_START, .type = XTTYPE_STRING}, {.name = "timestop", .id = O_TIME_STOP, .type = XTTYPE_STRING}, + {.name = "contiguous", .id = O_TIME_CONTIGUOUS, .type = XTTYPE_NONE}, {.name = "weekdays", .id = O_WEEKDAYS, .type = XTTYPE_STRING, .flags = XTOPT_INVERT}, {.name = "monthdays", .id = O_MONTHDAYS, .type = XTTYPE_STRING, @@ -273,6 +276,9 @@ static void time_parse(struct xt_option_call *cb) case O_TIME_STOP: info->daytime_stop = time_parse_minutes(cb->arg); break; + case O_TIME_CONTIGUOUS: + info->flags |= XT_TIME_CONTIGUOUS; + break; case O_LOCAL_TZ: fprintf(stderr, "WARNING: --localtz is being replaced by " "--kerneltz, since \"local\" is ambiguous. Note the " @@ -403,6 +409,8 @@ static void time_print(const void *ip, const struct xt_entry_match *match, } if (!(info->flags & XT_TIME_LOCAL_TZ)) printf(" UTC"); + if (info->flags & XT_TIME_CONTIGUOUS) + printf(" contiguous"); } static void time_save(const void *ip, const struct xt_entry_match *match) @@ -429,6 +437,17 @@ static void time_save(const void *ip, const struct xt_entry_match *match) time_print_date(info->date_stop, "--datestop"); if (info->flags & XT_TIME_LOCAL_TZ) printf(" --kerneltz"); + if (info->flags & XT_TIME_CONTIGUOUS) + printf(" --contiguous"); +} + +static void time_check(struct xt_fcheck_call *cb) +{ + const struct xt_time_info *info = (const void *) cb->data; + if ((cb->xflags & F_TIME_CONTIGUOUS) && + info->daytime_start < info->daytime_stop) + xtables_error(PARAMETER_PROBLEM, + "time: --contiguous only makes sense when stoptime is smaller than starttime"); } static struct xtables_match time_match = { @@ -442,6 +461,7 @@ static struct xtables_match time_match = { .print = time_print, .save = time_save, .x6_parse = time_parse, + .x6_fcheck = time_check, .x6_options = time_opts, }; -- cgit v1.2.3