openwrt/package/iptables/patches/02-layer7-1.5nbd.patch

   1 diff -urN iptables.old/extensions/.layer7-test iptables.dev/extensions/.layer7-test
   2 --- iptables.old/extensions/.layer7-test        1970-01-01 01:00:00.000000000 +0100
   3 +++ iptables.dev/extensions/.layer7-test        2005-11-10 16:57:51.819381000 +0100
   4 @@ -0,0 +1,2 @@
   5 +#! /bin/sh
   6 +[ -f $KERNEL_DIR/include/linux/netfilter_ipv4/ipt_layer7.h ] && echo layer7
   7 diff -urN iptables.old/extensions/ipt_layer7.h iptables.dev/extensions/ipt_layer7.h
   8 --- iptables.old/extensions/ipt_layer7.h        1970-01-01 01:00:00.000000000 +0100
   9 +++ iptables.dev/extensions/ipt_layer7.h        2005-11-10 17:46:32.933599750 +0100
  10 @@ -0,0 +1,27 @@
  11 +/*
  12 +  By Matthew Strait <quadong@users.sf.net>, Dec 2003.
  13 +  http://l7-filter.sf.net
  14 +
  15 +  This program is free software; you can redistribute it and/or
  16 +  modify it under the terms of the GNU General Public License
  17 +  as published by the Free Software Foundation; either version
  18 +  2 of the License, or (at your option) any later version.
  19 +  http://www.gnu.org/licenses/gpl.txt
  20 +*/
  21 +
  22 +#ifndef _IPT_LAYER7_H
  23 +#define _IPT_LAYER7_H
  24 +
  25 +#define MAX_PATTERN_LEN 8192
  26 +#define MAX_PROTOCOL_LEN 256
  27 +
  28 +typedef char *(*proc_ipt_search) (char *, char, char *);
  29 +
  30 +struct ipt_layer7_info {
  31 +    char protocol[MAX_PROTOCOL_LEN];
  32 +    char invert:1;
  33 +    char pattern[MAX_PATTERN_LEN];
  34 +       char pkt;
  35 +};
  36 +
  37 +#endif /* _IPT_LAYER7_H */
  38 diff -urN iptables.old/extensions/libipt_layer7.c iptables.dev/extensions/libipt_layer7.c
  39 --- iptables.old/extensions/libipt_layer7.c     1970-01-01 01:00:00.000000000 +0100
  40 +++ iptables.dev/extensions/libipt_layer7.c     2005-11-10 17:47:01.399378750 +0100
  41 @@ -0,0 +1,358 @@
  42 +/*
  43 +   Shared library add-on to iptables to add layer 7 matching support.
  44 +
  45 +   By Matthew Strait <quadong@users.sf.net>, Oct 2003.
  46 +
  47 +   http://l7-filter.sf.net
  48 +
  49 +   This program is free software; you can redistribute it and/or
  50 +   modify it under the terms of the GNU General Public License
  51 +   as published by the Free Software Foundation; either version
  52 +   2 of the License, or (at your option) any later version.
  53 +   http://www.gnu.org/licenses/gpl.txt
  54 +
  55 +   Based on libipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
  56 +*/
  57 +
  58 +#define _GNU_SOURCE
  59 +#include <stdio.h>
  60 +#include <netdb.h>
  61 +#include <string.h>
  62 +#include <stdlib.h>
  63 +#include <getopt.h>
  64 +#include <ctype.h>
  65 +#include <dirent.h>
  66 +
  67 +#include <iptables.h>
  68 +#include "ipt_layer7.h"
  69 +
  70 +#define MAX_FN_LEN 256
  71 +
  72 +static char l7dir[MAX_FN_LEN] = "\0";
  73 +
  74 +/* Function which prints out usage message. */
  75 +static void help(void)
  76 +{
  77 +       printf(
  78 +       "LAYER7 match v%s options:\n"
  79 +       "--l7dir <directory>  : Look for patterns here instead of /etc/l7-protocols/\n"
  80 +       "                       (--l7dir must be specified before --l7proto if used!)\n"
  81 +       "--l7proto [!] <name> : Match the protocol defined in /etc/l7-protocols/name.pat\n"
  82 +       "--l7pkt              : Skip connection tracking and match individual packets\n",
  83 +       IPTABLES_VERSION);
  84 +       fputc('\n', stdout);
  85 +}
  86 +
  87 +static struct option opts[] = {
  88 +       { .name = "l7proto", .has_arg = 1, .flag = 0, .val = '1' },
  89 +       { .name = "l7dir",   .has_arg = 1, .flag = 0, .val = '2' },
  90 +       { .name = "l7pkt",   .has_arg = 0, .flag = 0, .val = '3' },
  91 +       { .name = 0 }
  92 +};
  93 +
  94 +/* reads filename, puts protocol info into layer7_protocol_info, number of protocols to numprotos */
  95 +int parse_protocol_file(char * filename, const unsigned char * protoname, struct ipt_layer7_info *info)
  96 +{
  97 +       FILE * f;
  98 +       char * line = NULL;
  99 +       size_t len = 0;
 100 +
 101 +       enum { protocol, pattern, done } datatype = protocol;
 102 +
 103 +       f = fopen(filename, "r");
 104 +
 105 +       if(!f)
 106 +               return 0;
 107 +
 108 +       while(getline(&line, &len, f) != -1)
 109 +       {
 110 +               if(strlen(line) < 2 || line[0] == '#')
 111 +                       continue;
 112 +
 113 +               /* strip the pesky newline... */
 114 +               if(line[strlen(line) - 1] == '\n')
 115 +                       line[strlen(line) - 1] = '\0';
 116 +
 117 +               if(datatype == protocol)
 118 +               {
 119 +                       if(strcmp(line, protoname))
 120 +                               exit_error(OTHER_PROBLEM,
 121 +                                       "Protocol name (%s) doesn't match file name (%s).  Bailing out\n",
 122 +                                       protoname, filename);
 123 +
 124 +                       if(strlen(line) >= MAX_PROTOCOL_LEN)
 125 +                                exit_error(PARAMETER_PROBLEM,
 126 +                                       "Protocol name in %s too long!", filename);
 127 +                       strncpy(info->protocol, line, MAX_PROTOCOL_LEN);
 128 +
 129 +                       datatype = pattern;
 130 +               }
 131 +               else if(datatype == pattern)
 132 +               {
 133 +                       if(strlen(line) >= MAX_PATTERN_LEN)
 134 +                                exit_error(PARAMETER_PROBLEM, "Pattern in %s too long!", filename);
 135 +                       strncpy(info->pattern, line, MAX_PATTERN_LEN);
 136 +
 137 +                       datatype = done;
 138 +                       break;
 139 +               }
 140 +               else
 141 +                       exit_error(OTHER_PROBLEM, "Internal error");
 142 +       }
 143 +
 144 +       if(datatype != done)
 145 +               exit_error(OTHER_PROBLEM, "Failed to get all needed data from %s", filename);
 146 +
 147 +       if(line) free(line);
 148 +       fclose(f);
 149 +
 150 +       return 1;
 151 +
 152 +/*
 153 +       fprintf(stderr, "protocol: %s\npattern: %s\n\n",
 154 +                       info->protocol,
 155 +                       info->pattern);
 156 +*/
 157 +}
 158 +
 159 +static int hex2dec(char c)
 160 +{
 161 +        switch (c)
 162 +        {
 163 +                case '0' ... '9':
 164 +                        return c - '0';
 165 +                case 'a' ... 'f':
 166 +                        return c - 'a' + 10;
 167 +                case 'A' ... 'F':
 168 +                        return c - 'A' + 10;
 169 +                default:
 170 +                        exit_error(OTHER_PROBLEM, "hex2dec: bad value!\n");
 171 +                        return 0;
 172 +        }
 173 +}
 174 +
 175 +/* takes a string with \xHH escapes and returns one with the characters
 176 +they stand for */
 177 +static char * pre_process(char * s)
 178 +{
 179 +       char * result = malloc(strlen(s) + 1);
 180 +       int sindex = 0, rindex = 0;
 181 +        while( sindex < strlen(s) )
 182 +        {
 183 +            if( sindex + 3 < strlen(s) &&
 184 +                s[sindex] == '\\' && s[sindex+1] == 'x' &&
 185 +                isxdigit(s[sindex + 2]) && isxdigit(s[sindex + 3]) )
 186 +                {
 187 +                        /* carefully remember to call tolower here... */
 188 +                        result[rindex] = tolower( hex2dec(s[sindex + 2])*16 +
 189 +                                                  hex2dec(s[sindex + 3] ) );
 190 +                        sindex += 3; /* 4 total */
 191 +                }
 192 +                else
 193 +                        result[rindex] = tolower(s[sindex]);
 194 +
 195 +               sindex++;
 196 +               rindex++;
 197 +        }
 198 +       result[rindex] = '\0';
 199 +
 200 +       return result;
 201 +}
 202 +
 203 +#define MAX_SUBDIRS 128
 204 +char ** readl7dir(char * dirname)
 205 +{
 206 +        DIR             * scratchdir;
 207 +        struct dirent   ** namelist;
 208 +       char ** subdirs = malloc(MAX_SUBDIRS * sizeof(char *));
 209 +
 210 +        int n, d = 1;
 211 +       subdirs[0] = "";
 212 +
 213 +        n = scandir(dirname, &namelist, 0, alphasort);
 214 +
 215 +       if (n < 0)
 216 +       {
 217 +            perror("scandir");
 218 +           exit_error(OTHER_PROBLEM, "Couldn't open %s\n", dirname);
 219 +       }
 220 +        else
 221 +       {
 222 +               while(n--)
 223 +               {
 224 +                       char fulldirname[MAX_FN_LEN];
 225 +
 226 +                       snprintf(fulldirname, MAX_FN_LEN, "%s/%s", dirname, namelist[n]->d_name);
 227 +
 228 +                       if((scratchdir = opendir(fulldirname)) != NULL)
 229 +                       {
 230 +                               closedir(scratchdir);
 231 +
 232 +                               if(!strcmp(namelist[n]->d_name, ".") ||
 233 +                                  !strcmp(namelist[n]->d_name, ".."))
 234 +                                       /* do nothing */ ;
 235 +                               else
 236 +                               {
 237 +                                       subdirs[d] = malloc(strlen(namelist[n]->d_name) + 1);
 238 +                                       strcpy(subdirs[d], namelist[n]->d_name);
 239 +                                       d++;
 240 +                                       if(d >= MAX_SUBDIRS - 1)
 241 +                                       {
 242 +                                               fprintf(stderr,
 243 +                                                 "Too many subdirectories, skipping the rest!\n");
 244 +                                               break;
 245 +                                       }
 246 +                               }
 247 +                       }
 248 +                       free(namelist[n]);
 249 +               }
 250 +               free(namelist);
 251 +        }
 252 +
 253 +       subdirs[d] = NULL;
 254 +
 255 +       return subdirs;
 256 +}
 257 +
 258 +static void
 259 +parse_layer7_protocol(const unsigned char *s, struct ipt_layer7_info *info)
 260 +{
 261 +       char filename[MAX_FN_LEN];
 262 +       char * dir = NULL;
 263 +       char ** subdirs;
 264 +       int n = 0, done = 0;
 265 +
 266 +       if(strlen(l7dir) > 0)
 267 +               dir = l7dir;
 268 +       else
 269 +               dir = "/etc/l7-protocols";
 270 +
 271 +       subdirs = readl7dir(dir);
 272 +
 273 +       while(subdirs[n] != NULL)
 274 +       {
 275 +               int c = snprintf(filename, MAX_FN_LEN, "%s/%s/%s.pat", dir, subdirs[n], s);
 276 +
 277 +               //fprintf(stderr, "Trying to find pattern in %s ... ", filename);
 278 +
 279 +               if(c > MAX_FN_LEN)
 280 +               {
 281 +                       exit_error(OTHER_PROBLEM,
 282 +                               "Filename beginning with %s is too long!\n", filename);
 283 +               }
 284 +
 285 +               /* read in the pattern from the file */
 286 +               if(parse_protocol_file(filename, s, info))
 287 +               {
 288 +                       //fprintf(stderr, "found\n");
 289 +                       done = 1;
 290 +                       break;
 291 +               }
 292 +
 293 +               //fprintf(stderr, "not found\n");
 294 +
 295 +               n++;
 296 +       }
 297 +
 298 +       if(!done)
 299 +               exit_error(OTHER_PROBLEM,
 300 +                       "Couldn't find a pattern definition file for %s.\n", s);
 301 +
 302 +       /* process \xHH escapes and tolower everything. (our regex lib has no
 303 +       case insensitivity option.) */
 304 +       strncpy(info->pattern, pre_process(info->pattern), MAX_PATTERN_LEN);
 305 +}
 306 +
 307 +/* Function which parses command options; returns true if it ate an option */
 308 +static int parse(int c, char **argv, int invert, unsigned int *flags,
 309 +      const struct ipt_entry *entry, unsigned int *nfcache,
 310 +      struct ipt_entry_match **match)
 311 +{
 312 +       struct ipt_layer7_info *layer7info =
 313 +               (struct ipt_layer7_info *)(*match)->data;
 314 +
 315 +       switch (c) {
 316 +       case '1':
 317 +               check_inverse(optarg, &invert, &optind, 0);
 318 +               parse_layer7_protocol(argv[optind-1], layer7info);
 319 +               if (invert)
 320 +                       layer7info->invert = 1;
 321 +               *flags = 1;
 322 +               break;
 323 +
 324 +       case '2':
 325 +               /* not going to use this, but maybe we need to strip a ! anyway (?) */
 326 +               check_inverse(optarg, &invert, &optind, 0);
 327 +
 328 +               if(strlen(argv[optind-1]) >= MAX_FN_LEN)
 329 +                       exit_error(PARAMETER_PROBLEM, "directory name too long\n");
 330 +
 331 +               strncpy(l7dir, argv[optind-1], MAX_FN_LEN);
 332 +
 333 +               *flags = 1;
 334 +               break;
 335 +       case '3':
 336 +               layer7info->pkt = 1;
 337 +               break;
 338 +
 339 +       default:
 340 +               return 0;
 341 +       }
 342 +
 343 +       return 1;
 344 +}
 345 +
 346 +/* Final check; must have specified --pattern. */
 347 +static void final_check(unsigned int flags)
 348 +{
 349 +       if (!flags)
 350 +               exit_error(PARAMETER_PROBLEM,
 351 +                          "LAYER7 match: You must specify `--pattern'");
 352 +}
 353 +
 354 +static void print_protocol(char s[], int invert, int numeric)
 355 +{
 356 +       fputs("l7proto ", stdout);
 357 +       if (invert) fputc('!', stdout);
 358 +       printf("%s ", s);
 359 +}
 360 +
 361 +/* Prints out the matchinfo. */
 362 +static void print(const struct ipt_ip *ip,
 363 +      const struct ipt_entry_match *match,
 364 +      int numeric)
 365 +{
 366 +       printf("LAYER7 ");
 367 +
 368 +       print_protocol(((struct ipt_layer7_info *)match->data)->protocol,
 369 +                 ((struct ipt_layer7_info *)match->data)->invert, numeric);
 370 +
 371 +       if (((struct ipt_layer7_info *)match->data)->pkt)
 372 +               printf("l7pkt ");
 373 +}
 374 +/* Saves the union ipt_matchinfo in parsable form to stdout. */
 375 +static void save(const struct ipt_ip *ip, const struct ipt_entry_match *match)
 376 +{
 377 +        const struct ipt_layer7_info *info =
 378 +            (const struct ipt_layer7_info*) match->data;
 379 +
 380 +        printf("--l7proto %s%s ", (info->invert)   ? "! ": "", info->protocol);
 381 +}
 382 +
 383 +static struct iptables_match layer7 = {
 384 +    .name          = "layer7",
 385 +    .version       = IPTABLES_VERSION,
 386 +    .size          = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 387 +    .userspacesize = IPT_ALIGN(sizeof(struct ipt_layer7_info)),
 388 +    .help          = &help,
 389 +    .parse         = &parse,
 390 +    .final_check   = &final_check,
 391 +    .print         = &print,
 392 +    .save          = &save,
 393 +    .extra_opts    = opts
 394 +};
 395 +
 396 +void _init(void)
 397 +{
 398 +       register_match(&layer7);
 399 +}
 400 diff -urN iptables.old/extensions/libipt_layer7.man iptables.dev/extensions/libipt_layer7.man
 401 --- iptables.old/extensions/libipt_layer7.man   1970-01-01 01:00:00.000000000 +0100
 402 +++ iptables.dev/extensions/libipt_layer7.man   2005-11-10 16:57:51.823381250 +0100
 403 @@ -0,0 +1,13 @@
 404 +This module matches packets based on the application layer data of
 405 +their connections.  It uses regular expression matching to compare
 406 +the application layer data to regular expressions found it the layer7
 407 +configuration files.  This is an experimental module which can be found at
 408 +http://l7-filter.sf.net.  It takes two options.
 409 +.TP
 410 +.BI "--l7proto " "\fIprotocol\fP"
 411 +Match the specified protocol.  The protocol name must match a file
 412 +name in /etc/l7-protocols/
 413 +.TP
 414 +.BI "--l7dir " "\fIdirectory\fP"
 415 +Use \fIdirectory\fP instead of /etc/l7-protocols/
 416 +