mirror of
git://git.code.sf.net/p/xtables-addons/xtables-addons
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118 lines
3.3 KiB
C
118 lines
3.3 KiB
C
/*
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* "LOGMARK" target extension for iptables
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* Copyright © Jan Engelhardt, 2008
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License; either
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* version 2 of the License, or any later version, as published by the
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* Free Software Foundation.
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*/
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#include <getopt.h>
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#include <stdbool.h>
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#include <stdio.h>
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#include <string.h>
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#include <xtables.h>
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#include "xt_LOGMARK.h"
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#include "compat_user.h"
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enum {
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F_LEVEL = 1 << 0,
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F_PREFIX = 1 << 1,
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};
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static const struct option logmark_tg_opts[] = {
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{.name = "log-level", .has_arg = true, .val = 'l'},
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{.name = "log-prefix", .has_arg = true, .val = 'p'},
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{NULL},
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};
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static void logmark_tg_help(void)
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{
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printf(
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"LOGMARK target options:\n"
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" --log-level level Level of logging (numeric, 0-8)\n"
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" --log-prefix prefix Prefix log messages with this string\n"
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);
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}
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static void logmark_tg_init(struct xt_entry_target *target)
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{
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struct xt_logmark_tginfo *info = (void *)target->data;
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info->level = 4;
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*info->prefix = '\0';
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}
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static int
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logmark_tg_parse(int c, char **argv, int invert, unsigned int *flags,
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const void *entry, struct xt_entry_target **target)
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{
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struct xt_logmark_tginfo *info = (void *)(*target)->data;
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unsigned int x;
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switch (c) {
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case 'l': /* --log-level */
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xtables_param_act(XTF_ONLY_ONCE, "LOGMARK", "--log-level", *flags & F_LEVEL);
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xtables_param_act(XTF_NO_INVERT, "LOGMARK", "--log-level", invert);
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if (!xtables_strtoui(optarg, NULL, &x, 0, 8))
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xtables_param_act(XTF_BAD_VALUE, "LOGMARK", "--log-level", optarg);
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info->level = x;
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*flags |= F_LEVEL;
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return true;
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case 'p': /* --log-prefix */
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xtables_param_act(XTF_ONLY_ONCE, "LOGMARK", "--log-prefix", *flags & F_PREFIX);
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xtables_param_act(XTF_NO_INVERT, "LOGMARK", "--log-prefix", invert);
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if (strlen(optarg) > sizeof(info->prefix))
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xtables_error(PARAMETER_PROBLEM, "LOGMARK: Maximum "
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"prefix length is %zu",
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sizeof(info->prefix));
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if (strchr(optarg, '\n'))
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xtables_error(PARAMETER_PROBLEM, "LOGMARK: Newlines not "
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"allowed in log prefix");
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strncpy(info->prefix, optarg, sizeof(info->prefix));
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*flags |= F_PREFIX;
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return true;
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}
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return false;
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}
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static void
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logmark_tg_save(const void *ip, const struct xt_entry_target *target)
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{
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const struct xt_logmark_tginfo *info = (void *)target->data;
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if (info->level != 4)
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printf(" --log-level %u ", info->level);
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if (*info->prefix != '\0')
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printf(" --log-prefix \"%s\" ", info->prefix);
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}
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static void
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logmark_tg_print(const void *ip, const struct xt_entry_target *target,
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int numeric)
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{
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printf(" -j LOGMARK");
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logmark_tg_save(ip, target);
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}
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static struct xtables_target logmark_tg_reg = {
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.version = XTABLES_VERSION,
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.name = "LOGMARK",
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.revision = 0,
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.family = NFPROTO_UNSPEC,
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.size = XT_ALIGN(sizeof(struct xt_logmark_tginfo)),
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.userspacesize = XT_ALIGN(sizeof(struct xt_logmark_tginfo)),
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.help = logmark_tg_help,
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.init = logmark_tg_init,
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.parse = logmark_tg_parse,
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.print = logmark_tg_print,
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.save = logmark_tg_save,
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.extra_opts = logmark_tg_opts,
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};
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static __attribute__((constructor)) void logmark_tg_ldr(void)
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{
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xtables_register_target(&logmark_tg_reg);
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}
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