package/iptables/patches/1.4.0/002-layer7_2.17.patch

   1 --- iptables-1.4.0rc1/extensions/libipt_layer7.c        1969-12-31 18:00:00.000000000 -0600
   2 +++ iptables-1.4.0rc1-layer7/extensions/libipt_layer7.c 2007-11-19 06:06:56.000000000 -0600
   3 @@ -0,0 +1,393 @@
   4 +/*
   5 +   Shared library add-on to iptables to add layer 7 matching support.
   6 +
   7 +   By Matthew Strait <quadong@users.sf.net>, Oct 2003.
   8 +
   9 +   http://l7-filter.sf.net
  10 +
  11 +   This program is free software; you can redistribute it and/or
  12 +   modify it under the terms of the GNU General Public License
  13 +   as published by the Free Software Foundation; either version
  14 +   2 of the License, or (at your option) any later version.
  15 +   http://www.gnu.org/licenses/gpl.txt
  16 +
  17 +   Based on libipt_string.c (C) 2000 Emmanuel Roger <winfield@freegates.be>
  18 +*/
  19 +
  20 +#define _GNU_SOURCE
  21 +#include <stdio.h>
  22 +#include <netdb.h>
  23 +#include <string.h>
  24 +#include <stdlib.h>
  25 +#include <getopt.h>
  26 +#include <ctype.h>
  27 +#include <dirent.h>
  28 +
  29 +#include <iptables.h>
  30 +#include <linux/netfilter/xt_layer7.h>
  31 +
  32 +#define MAX_FN_LEN 256
  33 +
  34 +static char l7dir[MAX_FN_LEN] = "\0";
  35 +
  36 +/* Function which prints out usage message. */
  37 +static void help(void)
  38 +{
  39 +       printf(
  40 +       "LAYER7 match v%s options:\n"
  41 +       "--l7dir <directory>  : Look for patterns here instead of /etc/l7-protocols/\n"
  42 +       "                       (--l7dir must be specified before --l7proto if used!)\n"
  43 +       "--l7proto [!] <name> : Match the protocol defined in /etc/l7-protocols/name.pat\n",
  44 +       IPTABLES_VERSION);
  45 +       fputc('\n', stdout);
  46 +}
  47 +
  48 +static struct option opts[] = {
  49 +       { .name = "l7proto", .has_arg = 1, .flag = 0, .val = '1' },
  50 +       { .name = "l7dir",   .has_arg = 1, .flag = 0, .val = '2' },
  51 +       { .name = 0 }
  52 +};
  53 +
  54 +/* reads filename, puts protocol info into layer7_protocol_info, number of protocols to numprotos */
  55 +int parse_protocol_file(char * filename, const char * protoname, struct xt_layer7_info *info)
  56 +{
  57 +       FILE * f;
  58 +       char * line = NULL;
  59 +       size_t len = 0;
  60 +
  61 +       enum { protocol, pattern, done } datatype = protocol;
  62 +
  63 +       f = fopen(filename, "r");
  64 +
  65 +       if(!f)
  66 +               return 0;
  67 +
  68 +       while(getline(&line, &len, f) != -1)
  69 +       {
  70 +               if(strlen(line) < 2 || line[0] == '#')
  71 +                       continue;
  72 +
  73 +               /* strip the pesky newline... */
  74 +               if(line[strlen(line) - 1] == '\n')
  75 +                       line[strlen(line) - 1] = '\0';
  76 +
  77 +               if(datatype == protocol)
  78 +               {
  79 +                       /* Ignore everything on the line beginning with the
  80 +                       first space or tab . For instance, this allows the
  81 +                       protocol line in http.pat to be "http " (or
  82 +                       "http I am so cool") instead of just "http". */
  83 +                       if(strchr(line, ' ')){
  84 +                               char * space = strchr(line, ' ');
  85 +                               space[0] = '\0';
  86 +                       }
  87 +                       if(strchr(line, '\t')){
  88 +                               char * space = strchr(line, '\t');
  89 +                               space[0] = '\0';
  90 +                       }
  91 +
  92 +                       /* sanity check.  First non-comment non-blank
  93 +                       line must be the same as the file name. */
  94 +                       if(strcmp(line, protoname))
  95 +                               exit_error(OTHER_PROBLEM,
  96 +                                       "Protocol name (%s) doesn't match file name (%s).  Bailing out\n",
  97 +                                       line, filename);
  98 +
  99 +                       if(strlen(line) >= MAX_PROTOCOL_LEN)
 100 +                                exit_error(PARAMETER_PROBLEM,
 101 +                                       "Protocol name in %s too long!", filename);
 102 +                       strncpy(info->protocol, line, MAX_PROTOCOL_LEN);
 103 +
 104 +                       datatype = pattern;
 105 +               }
 106 +               else if(datatype == pattern)
 107 +               {
 108 +                       if(strlen(line) >= MAX_PATTERN_LEN)
 109 +                                exit_error(PARAMETER_PROBLEM, "Pattern in %s too long!", filename);
 110 +                       strncpy(info->pattern, line, MAX_PATTERN_LEN);
 111 +
 112 +                       datatype = done;
 113 +                       break;
 114 +               }
 115 +               else
 116 +                       exit_error(OTHER_PROBLEM, "Internal error");
 117 +       }
 118 +
 119 +       if(datatype != done)
 120 +               exit_error(OTHER_PROBLEM, "Failed to get all needed data from %s", filename);
 121 +
 122 +       if(line) free(line);
 123 +       fclose(f);
 124 +
 125 +       return 1;
 126 +
 127 +/*
 128 +       fprintf(stderr, "protocol: %s\npattern: %s\n\n",
 129 +                       info->protocol,
 130 +                       info->pattern);
 131 +*/
 132 +}
 133 +
 134 +static int hex2dec(char c)
 135 +{
 136 +        switch (c)
 137 +        {
 138 +                case '0' ... '9':
 139 +                        return c - '0';
 140 +                case 'a' ... 'f':
 141 +                        return c - 'a' + 10;
 142 +                case 'A' ... 'F':
 143 +                        return c - 'A' + 10;
 144 +                default:
 145 +                        exit_error(OTHER_PROBLEM, "hex2dec: bad value!\n");
 146 +                        return 0;
 147 +        }
 148 +}
 149 +
 150 +/* takes a string with \xHH escapes and returns one with the characters
 151 +they stand for */
 152 +static char * pre_process(char * s)
 153 +{
 154 +       char * result = malloc(strlen(s) + 1);
 155 +       int sindex = 0, rindex = 0;
 156 +        while( sindex < strlen(s) )
 157 +        {
 158 +            if( sindex + 3 < strlen(s) &&
 159 +                s[sindex] == '\\' && s[sindex+1] == 'x' &&
 160 +                isxdigit(s[sindex + 2]) && isxdigit(s[sindex + 3]) )
 161 +                {
 162 +                        /* carefully remember to call tolower here... */
 163 +                        result[rindex] = tolower( hex2dec(s[sindex + 2])*16 +
 164 +                                                  hex2dec(s[sindex + 3] ) );
 165 +
 166 +                       switch ( result[rindex] )
 167 +                       {
 168 +                       case 0x24:
 169 +                       case 0x28:
 170 +                       case 0x29:
 171 +                       case 0x2a:
 172 +                       case 0x2b:
 173 +                       case 0x2e:
 174 +                       case 0x3f:
 175 +                       case 0x5b:
 176 +                       case 0x5c:
 177 +                       case 0x5d:
 178 +                       case 0x5e:
 179 +                       case 0x7c:
 180 +                               fprintf(stderr,
 181 +                                       "Warning: layer7 regexp contains a control character, %c, in hex (\\x%c%c).\n"
 182 +                                       "I recommend that you write this as %c or \\%c, depending on what you meant.\n",
 183 +                                       result[rindex], s[sindex + 2], s[sindex + 3], result[rindex], result[rindex]);
 184 +                               break;
 185 +                       case 0x00:
 186 +                               fprintf(stderr,
 187 +                                       "Warning: null (\\x00) in layer7 regexp.  A null terminates the regexp string!\n");
 188 +                               break;
 189 +                       default:
 190 +                               break;
 191 +                       }
 192 +
 193 +
 194 +                        sindex += 3; /* 4 total */
 195 +                }
 196 +                else
 197 +                        result[rindex] = tolower(s[sindex]);
 198 +
 199 +               sindex++;
 200 +               rindex++;
 201 +        }
 202 +       result[rindex] = '\0';
 203 +
 204 +       return result;
 205 +}
 206 +
 207 +#define MAX_SUBDIRS 128
 208 +char ** readl7dir(char * dirname)
 209 +{
 210 +        DIR             * scratchdir;
 211 +        struct dirent   ** namelist;
 212 +       char ** subdirs = malloc(MAX_SUBDIRS * sizeof(char *));
 213 +
 214 +        int n, d = 1;
 215 +       subdirs[0] = "";
 216 +
 217 +        n = scandir(dirname, &namelist, 0, alphasort);
 218 +
 219 +       if (n < 0)
 220 +       {
 221 +            perror("scandir");
 222 +           exit_error(OTHER_PROBLEM, "Couldn't open %s\n", dirname);
 223 +       }
 224 +        else
 225 +       {
 226 +               while(n--)
 227 +               {
 228 +                       char fulldirname[MAX_FN_LEN];
 229 +
 230 +                       snprintf(fulldirname, MAX_FN_LEN, "%s/%s", dirname, namelist[n]->d_name);
 231 +
 232 +                       if((scratchdir = opendir(fulldirname)) != NULL)
 233 +                       {
 234 +                               closedir(scratchdir);
 235 +
 236 +                               if(!strcmp(namelist[n]->d_name, ".") ||
 237 +                                  !strcmp(namelist[n]->d_name, ".."))
 238 +                                       /* do nothing */ ;
 239 +                               else
 240 +                               {
 241 +                                       subdirs[d] = malloc(strlen(namelist[n]->d_name) + 1);
 242 +                                       strcpy(subdirs[d], namelist[n]->d_name);
 243 +                                       d++;
 244 +                                       if(d >= MAX_SUBDIRS - 1)
 245 +                                       {
 246 +                                               fprintf(stderr,
 247 +                                                 "Too many subdirectories, skipping the rest!\n");
 248 +                                               break;
 249 +                                       }
 250 +                               }
 251 +                       }
 252 +                       free(namelist[n]);
 253 +               }
 254 +               free(namelist);
 255 +        }
 256 +
 257 +       subdirs[d] = NULL;
 258 +
 259 +       return subdirs;
 260 +}
 261 +
 262 +static void
 263 +parse_layer7_protocol(const char *s, struct xt_layer7_info *info)
 264 +{
 265 +       char filename[MAX_FN_LEN];
 266 +       char * dir = NULL;
 267 +       char ** subdirs;
 268 +       int n = 0, done = 0;
 269 +
 270 +       if(strlen(l7dir) > 0)
 271 +               dir = l7dir;
 272 +       else
 273 +               dir = "/etc/l7-protocols";
 274 +
 275 +       subdirs = readl7dir(dir);
 276 +
 277 +       while(subdirs[n] != NULL)
 278 +       {
 279 +               int c = snprintf(filename, MAX_FN_LEN, "%s/%s/%s.pat", dir, subdirs[n], s);
 280 +
 281 +               //fprintf(stderr, "Trying to find pattern in %s ... ", filename);
 282 +
 283 +               if(c > MAX_FN_LEN)
 284 +               {
 285 +                       exit_error(OTHER_PROBLEM,
 286 +                               "Filename beginning with %s is too long!\n", filename);
 287 +               }
 288 +
 289 +               /* read in the pattern from the file */
 290 +               if(parse_protocol_file(filename, s, info))
 291 +               {
 292 +                       //fprintf(stderr, "found\n");
 293 +                       done = 1;
 294 +                       break;
 295 +               }
 296 +
 297 +               //fprintf(stderr, "not found\n");
 298 +
 299 +               n++;
 300 +       }
 301 +
 302 +       if(!done)
 303 +               exit_error(OTHER_PROBLEM,
 304 +                       "Couldn't find a pattern definition file for %s.\n", s);
 305 +
 306 +       /* process \xHH escapes and tolower everything. (our regex lib has no
 307 +       case insensitivity option.) */
 308 +       strncpy(info->pattern, pre_process(info->pattern), MAX_PATTERN_LEN);
 309 +}
 310 +
 311 +/* Function which parses command options; returns true if it ate an option */
 312 +static int parse(int c, char **argv, int invert, unsigned int *flags,
 313 +      const void *entry, struct xt_entry_match **match)
 314 +{
 315 +       struct xt_layer7_info *layer7info =
 316 +               (struct xt_layer7_info *)(*match)->data;
 317 +
 318 +       switch (c) {
 319 +       case '1':
 320 +               check_inverse(optarg, &invert, &optind, 0);
 321 +               parse_layer7_protocol(argv[optind-1], layer7info);
 322 +               if (invert)
 323 +                       layer7info->invert = 1;
 324 +               *flags = 1;
 325 +               break;
 326 +
 327 +       case '2':
 328 +               /* not going to use this, but maybe we need to strip a ! anyway (?) */
 329 +               check_inverse(optarg, &invert, &optind, 0);
 330 +
 331 +               if(strlen(argv[optind-1]) >= MAX_FN_LEN)
 332 +                       exit_error(PARAMETER_PROBLEM, "directory name too long\n");
 333 +
 334 +               strncpy(l7dir, argv[optind-1], MAX_FN_LEN);
 335 +
 336 +               *flags = 1;
 337 +               break;
 338 +
 339 +       default:
 340 +               return 0;
 341 +       }
 342 +
 343 +       return 1;
 344 +}
 345 +
 346 +/* Final check; must have specified --l7proto */
 347 +static void final_check(unsigned int flags)
 348 +{
 349 +       if (!flags)
 350 +               exit_error(PARAMETER_PROBLEM,
 351 +                          "LAYER7 match: You must specify `--l7proto'");
 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 void *ip,
 363 +      const struct xt_entry_match *match,
 364 +      int numeric)
 365 +{
 366 +       printf("LAYER7 ");
 367 +
 368 +       print_protocol(((struct xt_layer7_info *)match->data)->protocol,
 369 +                 ((struct xt_layer7_info *)match->data)->invert, numeric);
 370 +}
 371 +/* Saves the union ipt_matchinfo in parsable form to stdout. */
 372 +static void save(const void *ip, const struct xt_entry_match *match)
 373 +{
 374 +        const struct xt_layer7_info *info =
 375 +            (const struct xt_layer7_info*) match->data;
 376 +
 377 +        printf("--l7proto %s%s ", (info->invert)   ? "! ": "", info->protocol);
 378 +}
 379 +
 380 +static struct iptables_match layer7 = {
 381 +    .name          = "layer7",
 382 +    .version       = IPTABLES_VERSION,
 383 +    .size          = IPT_ALIGN(sizeof(struct xt_layer7_info)),
 384 +    .userspacesize = IPT_ALIGN(sizeof(struct xt_layer7_info)),
 385 +    .help          = &help,
 386 +    .parse         = &parse,
 387 +    .final_check   = &final_check,
 388 +    .print         = &print,
 389 +    .save          = &save,
 390 +    .extra_opts    = opts
 391 +};
 392 +
 393 +void _init(void)
 394 +{
 395 +       register_match(&layer7);
 396 +}
 397 --- iptables-1.4.0rc1/extensions/libipt_layer7.man      1969-12-31 18:00:00.000000000 -0600
 398 +++ iptables-1.4.0rc1-layer7/extensions/libipt_layer7.man       2007-11-19 05:49:46.000000000 -0600
 399 @@ -0,0 +1,14 @@
 400 +This module matches packets based on the application layer data of
 401 +their connections.  It uses regular expression matching to compare
 402 +the application layer data to regular expressions found it the layer7
 403 +configuration files.  This is an experimental module which can be found at
 404 +http://l7-filter.sf.net.  It takes two options.
 405 +.TP
 406 +.BI "--l7proto " "\fIprotocol\fP"
 407 +Match the specified protocol.  The protocol name must match a file
 408 +name in /etc/l7-protocols/ or one of its first-level child directories.
 409 +.TP
 410 +.BI "--l7dir " "\fIdirectory\fP"
 411 +Use \fIdirectory\fP instead of /etc/l7-protocols/.  This option must be
 412 +specified before --l7proto.
 413 +
 414 --- iptables-1.4.0rc1/extensions/.layer7-test   1969-12-31 18:00:00.000000000 -0600
 415 +++ iptables-1.4.0rc1-layer7/extensions/.layer7-test    2007-11-19 06:18:58.000000000 -0600
 416 @@ -0,0 +1,2 @@
 417 +#! /bin/sh
 418 +[ -f $KERNEL_DIR/include/linux/netfilter/xt_layer7.h ] && echo layer7