release/src/router/ebtables/extensions/ebt_log.c

   1 /* ebt_log
   2  *
   3  * Authors:
   4  * Bart De Schuymer <bdschuym@pandora.be>
   5  *
   6  * April, 2002
   7  */
   8
   9 #include <stdio.h>
  10 #include <stdlib.h>
  11 #include <string.h>
  12 #include <getopt.h>
  13 #include "../include/ebtables_u.h"
  14 #include <linux/netfilter_bridge/ebt_log.h>
  15
  16 /*
  17  * copied from syslog.h
  18  * used for the LOG target
  19  */
  20 #define LOG_EMERG       0 /* system is unusable               */
  21 #define LOG_ALERT       1 /* action must be taken immediately */
  22 #define LOG_CRIT        2 /* critical conditions              */
  23 #define LOG_ERR         3 /* error conditions                 */
  24 #define LOG_WARNING     4 /* warning conditions               */
  25 #define LOG_NOTICE      5 /* normal but significant condition */
  26 #define LOG_INFO        6 /* informational                    */
  27 #define LOG_DEBUG       7 /* debug-level messages             */
  28
  29 #define LOG_DEFAULT_LEVEL LOG_INFO
  30
  31 typedef struct _code {
  32         char *c_name;
  33         int c_val;
  34 } CODE;
  35
  36 static CODE eight_priority[] = {
  37         { "emerg", LOG_EMERG },
  38         { "alert", LOG_ALERT },
  39         { "crit", LOG_CRIT },
  40         { "error", LOG_ERR },
  41         { "warning", LOG_WARNING },
  42         { "notice", LOG_NOTICE },
  43         { "info", LOG_INFO },
  44         { "debug", LOG_DEBUG }
  45 };
  46
  47 static int name_to_loglevel(char* arg)
  48 {
  49         int i;
  50
  51         for (i = 0; i < 8; i++)
  52                 if (!strcmp(arg, eight_priority[i].c_name))
  53                         return eight_priority[i].c_val;
  54         /* return bad loglevel */
  55         return 9;
  56 }
  57
  58 #define LOG_PREFIX '1'
  59 #define LOG_LEVEL  '2'
  60 #define LOG_ARP    '3'
  61 #define LOG_IP     '4'
  62 #define LOG_LOG    '5'
  63 #define LOG_IP6    '6'
  64 static struct option opts[] =
  65 {
  66         { "log-prefix", required_argument, 0, LOG_PREFIX },
  67         { "log-level" , required_argument, 0, LOG_LEVEL  },
  68         { "log-arp"   , no_argument      , 0, LOG_ARP    },
  69         { "log-ip"    , no_argument      , 0, LOG_IP     },
  70         { "log"       , no_argument      , 0, LOG_LOG    },
  71         { "log-ip6"   , no_argument      , 0, LOG_IP6    },
  72         { 0 }
  73 };
  74
  75 static void print_help()
  76 {
  77         int i;
  78
  79         printf(
  80 "log options:\n"
  81 "--log               : use this if you're not specifying anything\n"
  82 "--log-level level   : level = [1-8] or a string\n"
  83 "--log-prefix prefix : max. %d chars.\n"
  84 "--log-ip            : put ip info. in the log for ip packets\n"
  85 "--log-arp           : put (r)arp info. in the log for (r)arp packets\n"
  86 "--log-ip6           : put ip6 info. in the log for ip6 packets\n"
  87         , EBT_LOG_PREFIX_SIZE - 1);
  88         printf("levels:\n");
  89         for (i = 0; i < 8; i++)
  90                 printf("%d = %s\n", eight_priority[i].c_val,
  91                    eight_priority[i].c_name);
  92 }
  93
  94 static void init(struct ebt_entry_watcher *watcher)
  95 {
  96         struct ebt_log_info *loginfo = (struct ebt_log_info *)watcher->data;
  97
  98         loginfo->bitmask = 0;
  99         loginfo->prefix[0] = '\0';
 100         loginfo->loglevel = LOG_NOTICE;
 101 }
 102
 103 #define OPT_PREFIX 0x01
 104 #define OPT_LEVEL  0x02
 105 #define OPT_ARP    0x04
 106 #define OPT_IP     0x08
 107 #define OPT_LOG    0x10
 108 #define OPT_IP6    0x20
 109 static int parse(int c, char **argv, int argc, const struct ebt_u_entry *entry,
 110    unsigned int *flags, struct ebt_entry_watcher **watcher)
 111 {
 112         struct ebt_log_info *loginfo = (struct ebt_log_info *)(*watcher)->data;
 113         long int i;
 114         char *end;
 115
 116         switch (c) {
 117         case LOG_PREFIX:
 118                 ebt_check_option2(flags, OPT_PREFIX);
 119                 if (ebt_check_inverse(optarg))
 120                         ebt_print_error2("Unexpected `!' after --log-prefix");
 121                 if (strlen(optarg) > sizeof(loginfo->prefix) - 1)
 122                         ebt_print_error2("Prefix too long");
 123                 if (strchr(optarg, '\"'))
 124                         ebt_print_error2("Use of \\\" is not allowed in the prefix");
 125                 strcpy((char *)loginfo->prefix, (char *)optarg);
 126                 break;
 127
 128         case LOG_LEVEL:
 129                 ebt_check_option2(flags, OPT_LEVEL);
 130                 i = strtol(optarg, &end, 16);
 131                 if (*end != '\0' || i < 0 || i > 7)
 132                         loginfo->loglevel = name_to_loglevel(optarg);
 133                 else
 134                         loginfo->loglevel = i;
 135                 if (loginfo->loglevel == 9)
 136                         ebt_print_error2("Problem with the log-level");
 137                 break;
 138
 139         case LOG_IP:
 140                 ebt_check_option2(flags, OPT_IP);
 141                 if (ebt_check_inverse(optarg))
 142                         ebt_print_error2("Unexpected `!' after --log-ip");
 143                 loginfo->bitmask |= EBT_LOG_IP;
 144                 break;
 145
 146         case LOG_ARP:
 147                 ebt_check_option2(flags, OPT_ARP);
 148                 if (ebt_check_inverse(optarg))
 149                         ebt_print_error2("Unexpected `!' after --log-arp");
 150                 loginfo->bitmask |= EBT_LOG_ARP;
 151                 break;
 152
 153         case LOG_LOG:
 154                 ebt_check_option2(flags, OPT_LOG);
 155                 if (ebt_check_inverse(optarg))
 156                         ebt_print_error2("Unexpected `!' after --log");
 157                 break;
 158
 159         case LOG_IP6:
 160                 ebt_check_option2(flags, OPT_IP6);
 161                 if (ebt_check_inverse(optarg))
 162                         ebt_print_error2("Unexpected `!' after --log-ip6");
 163                 loginfo->bitmask |= EBT_LOG_IP6;
 164                 break;
 165         default:
 166                 return 0;
 167         }
 168         return 1;
 169 }
 170
 171 static void final_check(const struct ebt_u_entry *entry,
 172    const struct ebt_entry_watcher *watcher, const char *name,
 173    unsigned int hookmask, unsigned int time)
 174 {
 175 }
 176
 177 static void print(const struct ebt_u_entry *entry,
 178    const struct ebt_entry_watcher *watcher)
 179 {
 180         struct ebt_log_info *loginfo = (struct ebt_log_info *)watcher->data;
 181
 182         printf("--log-level %s --log-prefix \"%s\"",
 183                 eight_priority[loginfo->loglevel].c_name,
 184                 loginfo->prefix);
 185         if (loginfo->bitmask & EBT_LOG_IP)
 186                 printf(" --log-ip");
 187         if (loginfo->bitmask & EBT_LOG_ARP)
 188                 printf(" --log-arp");
 189         if (loginfo->bitmask & EBT_LOG_IP6)
 190                 printf(" --log-ip6");
 191         printf(" ");
 192 }
 193
 194 static int compare(const struct ebt_entry_watcher *w1,
 195    const struct ebt_entry_watcher *w2)
 196 {
 197         struct ebt_log_info *loginfo1 = (struct ebt_log_info *)w1->data;
 198         struct ebt_log_info *loginfo2 = (struct ebt_log_info *)w2->data;
 199
 200         if (loginfo1->loglevel != loginfo2->loglevel)
 201                 return 0;
 202         if (loginfo1->bitmask != loginfo2->bitmask)
 203                 return 0;
 204         return !strcmp((char *)loginfo1->prefix, (char *)loginfo2->prefix);
 205 }
 206
 207 static struct ebt_u_watcher log_watcher =
 208 {
 209         .name           = "log",
 210         .size           = sizeof(struct ebt_log_info),
 211         .help           = print_help,
 212         .init           = init,
 213         .parse          = parse,
 214         .final_check    = final_check,
 215         .print          = print,
 216         .compare        = compare,
 217         .extra_ops      = opts,
 218 };
 219
 220 void _init(void)
 221 {
 222         ebt_register_watcher(&log_watcher);
 223 }