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weburl kernel patch

stasn77
Feb 14th, 2015
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  1. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  2. +++ b/include/linux/netfilter_ipv4/ipt_weburl.h 2015-01-25 11:36:00.000000000 +0300
  3. @@ -0,0 +1,45 @@
  4. +/*  weburl --  A netfilter module to match URLs in HTTP requests
  5. + *         This module can match using string match or regular expressions
  6. + *         Originally designed for use with Gargoyle router firmware (gargoyle-router.com)
  7. + *
  8. + *
  9. + *  Copyright © 2008 by Eric Bishop <eric@gargoyle-router.com>
  10. + *
  11. + *  This file is free software: you may copy, redistribute and/or modify it
  12. + *  under the terms of the GNU General Public License as published by the
  13. + *  Free Software Foundation, either version 2 of the License, or (at your
  14. + *  option) any later version.
  15. + *
  16. + *  This file is distributed in the hope that it will be useful, but
  17. + *  WITHOUT ANY WARRANTY; without even the implied warranty of
  18. + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  19. + *  General Public License for more details.
  20. + *
  21. + *  You should have received a copy of the GNU General Public License
  22. + *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  23. + */
  24. +
  25. +
  26. +
  27. +
  28. +#ifndef _IPT_WEBURL_H
  29. +#define _IPT_WEBURL_H
  30. +
  31. +
  32. +#define MAX_TEST_STR 1024
  33. +
  34. +#define WEBURL_CONTAINS_TYPE 1
  35. +#define WEBURL_REGEX_TYPE 2
  36. +#define WEBURL_EXACT_TYPE 3
  37. +#define WEBURL_ALL_PART 4
  38. +#define WEBURL_DOMAIN_PART 5
  39. +#define WEBURL_PATH_PART 6
  40. +
  41. +struct ipt_weburl_info
  42. +{
  43. +   char test_str[MAX_TEST_STR];
  44. +   unsigned char match_type;
  45. +   unsigned char match_part;
  46. +   unsigned char invert;
  47. +};
  48. +#endif /*_IPT_WEBURL_H*/
  49. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  50. +++ b/net/ipv4/netfilter/ipt_weburl.c   2015-01-26 07:44:03.260212259 +0300
  51. @@ -0,0 +1,398 @@
  52. +/*  weburl --  A netfilter module to match URLs in HTTP requests
  53. + *         This module can match using string match or regular expressions
  54. + *         Originally designed for use with Gargoyle router firmware (gargoyle-router.com)
  55. + *
  56. + *
  57. + *  Copyright © 2008-2010 by Eric Bishop <eric@gargoyle-router.com>
  58. + *
  59. + *  This file is free software: you may copy, redistribute and/or modify it
  60. + *  under the terms of the GNU General Public License as published by the
  61. + *  Free Software Foundation, either version 2 of the License, or (at your
  62. + *  option) any later version.
  63. + *
  64. + *  This file is distributed in the hope that it will be useful, but
  65. + *  WITHOUT ANY WARRANTY; without even the implied warranty of
  66. + *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  67. + *  General Public License for more details.
  68. + *
  69. + *  You should have received a copy of the GNU General Public License
  70. + *  along with this program.  If not, see <http://www.gnu.org/licenses/>.
  71. + */
  72. +
  73. +#include <linux/kernel.h>
  74. +#include <linux/version.h>
  75. +#include <linux/module.h>
  76. +#include <linux/skbuff.h>
  77. +#include <linux/if_ether.h>
  78. +#include <linux/string.h>
  79. +#include <linux/ctype.h>
  80. +#include <net/sock.h>
  81. +#include <net/ip.h>
  82. +#include <net/tcp.h>
  83. +
  84. +#include <linux/netfilter_ipv4/ip_tables.h>
  85. +#include <linux/netfilter_ipv4/ipt_weburl.h>
  86. +
  87. +#include "weburl_deps/regexp.c"
  88. +#include "weburl_deps/tree_map.h"
  89. +
  90. +
  91. +#include <linux/ip.h>
  92. +
  93. +
  94. +#include <linux/netfilter/x_tables.h>
  95. +
  96. +
  97. +
  98. +MODULE_LICENSE("GPL");
  99. +MODULE_AUTHOR("Eric Bishop");
  100. +MODULE_DESCRIPTION("Match URL in HTTP requests, designed for use with Gargoyle web interface (www.gargoyle-router.com)");
  101. +
  102. +string_map* compiled_map = NULL;
  103. +
  104. +int strnicmp(const char * cs,const char * ct,size_t count)
  105. +{
  106. +   register signed char __res = 0;
  107. +
  108. +   while (count)
  109. +   {
  110. +       if ((__res = toupper( *cs ) - toupper( *ct++ ) ) != 0 || !*cs++)
  111. +       {
  112. +           break;
  113. +       }
  114. +       count--;
  115. +   }
  116. +   return __res;
  117. +}
  118. +
  119. +char *strnistr(const char *s, const char *find, size_t slen)
  120. +{
  121. +   char c, sc;
  122. +   size_t len;
  123. +
  124. +
  125. +   if ((c = *find++) != '\0')
  126. +   {
  127. +       len = strlen(find);
  128. +       do
  129. +       {
  130. +           do
  131. +           {
  132. +                   if (slen < 1 || (sc = *s) == '\0')
  133. +               {
  134. +                       return (NULL);
  135. +               }
  136. +                   --slen;
  137. +                   ++s;
  138. +               }
  139. +           while ( toupper(sc) != toupper(c));
  140. +              
  141. +           if (len > slen)
  142. +           {
  143. +                   return (NULL);
  144. +           }
  145. +           }
  146. +       while (strnicmp(s, find, len) != 0);
  147. +          
  148. +       s--;
  149. +       }
  150. +       return ((char *)s);
  151. +}
  152. +
  153. +
  154. +int do_match_test(unsigned char match_type,  const char* reference, char* query)
  155. +{
  156. +   int matches = 0;
  157. +   struct regexp* r;
  158. +   switch(match_type)
  159. +   {
  160. +       case WEBURL_CONTAINS_TYPE:
  161. +           matches = (strstr(query, reference) != NULL);
  162. +           break;
  163. +       case WEBURL_REGEX_TYPE:
  164. +
  165. +           if(compiled_map == NULL)
  166. +           {
  167. +               compiled_map = initialize_map(0);
  168. +               if(compiled_map == NULL) /* test for malloc failure */
  169. +               {
  170. +                   return 0;
  171. +               }
  172. +           }
  173. +           r = (struct regexp*)get_map_element(compiled_map, reference);
  174. +           if(r == NULL)
  175. +           {
  176. +               int rlen = strlen(reference);
  177. +               r= regcomp((char*)reference, &rlen);
  178. +               if(r == NULL) /* test for malloc failure */
  179. +               {
  180. +                   return 0;
  181. +               }
  182. +               set_map_element(compiled_map, reference, (void*)r);
  183. +           }
  184. +           matches = regexec(r, query);
  185. +           break;
  186. +       case WEBURL_EXACT_TYPE:
  187. +           matches = (strstr(query, reference) != NULL) && strlen(query) == strlen(reference);
  188. +           break;
  189. +   }
  190. +   return matches;
  191. +}
  192. +
  193. +int http_match(const struct ipt_weburl_info* info, const unsigned char* packet_data, int packet_length)
  194. +{
  195. +   int test = 0;
  196. +  
  197. +   /* first test if we're dealing with a web page request */
  198. +   if(strnicmp((char*)packet_data, "GET ", 4) == 0 || strnicmp(  (char*)packet_data, "POST ", 5) == 0 || strnicmp((char*)packet_data, "HEAD ", 5) == 0)
  199. +   {
  200. +       /* printk("found a  web page request\n"); */
  201. +       char path[625] = "";
  202. +       char host[625] = "";
  203. +       int path_start_index;
  204. +       int path_end_index;
  205. +       int last_header_index;
  206. +       char last_two_buf[2];
  207. +       int end_found;
  208. +       char* host_match;
  209. +       char* test_prefixes[6];
  210. +       int prefix_index;
  211. +  
  212. +       /* get path portion of URL */
  213. +       path_start_index = (int)(strstr((char*)packet_data, " ") - (char*)packet_data);
  214. +       while( packet_data[path_start_index] == ' ')
  215. +       {
  216. +           path_start_index++;
  217. +       }
  218. +       path_end_index= (int)(strstr( (char*)(packet_data+path_start_index), " ") -  (char*)packet_data);
  219. +       if(path_end_index > 0)
  220. +       {
  221. +           int path_length = path_end_index-path_start_index;
  222. +           path_length = path_length < 625 ? path_length : 624; /* prevent overflow */
  223. +           memcpy(path, packet_data+path_start_index, path_length);
  224. +           path[ path_length] = '\0';
  225. +       }
  226. +      
  227. +       /* get header length */
  228. +       last_header_index = 2;
  229. +       memcpy(last_two_buf,(char*)packet_data, 2);
  230. +       end_found = 0;
  231. +       while(end_found == 0 && last_header_index < packet_length)
  232. +       {
  233. +           char next = (char)packet_data[last_header_index];
  234. +           if(next == '\n')
  235. +           {
  236. +               end_found = last_two_buf[1] == '\n' || (last_two_buf[0] == '\n' && last_two_buf[1] == '\r') ? 1 : 0;
  237. +           }
  238. +           if(end_found == 0)
  239. +           {
  240. +               last_two_buf[0] = last_two_buf[1];
  241. +               last_two_buf[1] = next;
  242. +               last_header_index++;
  243. +           }
  244. +       }
  245. +      
  246. +       /* get host portion of URL */
  247. +       host_match = strnistr( (char*)packet_data, "Host:", last_header_index);
  248. +       if(host_match != NULL)
  249. +       {
  250. +           int host_end_index;
  251. +           host_match = host_match + 5; /* character after "Host:" */
  252. +           while(host_match[0] == ' ')
  253. +           {
  254. +               host_match = host_match+1;
  255. +           }
  256. +          
  257. +           host_end_index = 0;
  258. +           while(  host_match[host_end_index] != '\n' &&
  259. +               host_match[host_end_index] != '\r' &&
  260. +               host_match[host_end_index] != ' ' &&
  261. +               host_match[host_end_index] != ':' &&
  262. +               ((char*)host_match - (char*)packet_data)+host_end_index < last_header_index
  263. +               )
  264. +           {
  265. +               host_end_index++;
  266. +           }
  267. +           memcpy(host, host_match, host_end_index);
  268. +           host_end_index = host_end_index < 625 ? host_end_index : 624; /* prevent overflow */
  269. +           host[host_end_index] = '\0';
  270. +
  271. +          
  272. +       }
  273. +  
  274. +       /* printk("host = \"%s\", path =\"%s\"\n", host, path); */
  275. +      
  276. +
  277. +       switch(info->match_part)
  278. +       {
  279. +           case WEBURL_DOMAIN_PART:
  280. +               test = do_match_test(info->match_type, info->test_str, host);
  281. +               if(!test && strstr(host, "www.") == host)
  282. +               {
  283. +                   test = do_match_test(info->match_type, info->test_str, ((char*)host+4) );  
  284. +               }
  285. +               break;
  286. +           case WEBURL_PATH_PART:
  287. +               test = do_match_test(info->match_type, info->test_str, path);
  288. +               if( !test && path[0] == '/' )
  289. +               {
  290. +                   test = do_match_test(info->match_type, info->test_str, ((char*)path+1) );
  291. +               }
  292. +               break;
  293. +           case WEBURL_ALL_PART:
  294. +              
  295. +               test_prefixes[0] = "http://";
  296. +               test_prefixes[1] = "";
  297. +               test_prefixes[2] = NULL;
  298. +
  299. +              
  300. +               for(prefix_index=0; test_prefixes[prefix_index] != NULL && test == 0; prefix_index++)
  301. +               {
  302. +                   char test_url[1250];
  303. +                   test_url[0] = '\0';
  304. +                   strcat(test_url, test_prefixes[prefix_index]);
  305. +                   strcat(test_url, host);
  306. +                   if(strcmp(path, "/") != 0)
  307. +                   {
  308. +                       strcat(test_url, path);
  309. +                   }
  310. +                   test = do_match_test(info->match_type, info->test_str, test_url);
  311. +                   if(!test && strcmp(path, "/") == 0)
  312. +                   {
  313. +                       strcat(test_url, path);
  314. +                       test = do_match_test(info->match_type, info->test_str, test_url);
  315. +                   }
  316. +                  
  317. +                   /* printk("test_url = \"%s\", test=%d\n", test_url, test); */
  318. +               }
  319. +               if(!test && strstr(host, "www.") == host)
  320. +               {
  321. +                   char* www_host = ((char*)host+4);
  322. +                   for(prefix_index=0; test_prefixes[prefix_index] != NULL && test == 0; prefix_index++)
  323. +                   {
  324. +                       char test_url[1250];
  325. +                       test_url[0] = '\0';
  326. +                       strcat(test_url, test_prefixes[prefix_index]);
  327. +                       strcat(test_url, www_host);
  328. +                       if(strcmp(path, "/") != 0)
  329. +                       {
  330. +                           strcat(test_url, path);
  331. +                       }
  332. +                       test = do_match_test(info->match_type, info->test_str, test_url);
  333. +                       if(!test && strcmp(path, "/") == 0)
  334. +                       {
  335. +                           strcat(test_url, path);
  336. +                           test = do_match_test(info->match_type, info->test_str, test_url);
  337. +                       }
  338. +                  
  339. +                       /* printk("test_url = \"%s\", test=%d\n", test_url, test); */
  340. +                   }
  341. +               }
  342. +               break;
  343. +          
  344. +       }      
  345. +
  346. +
  347. +       /*
  348. +        * If invert flag is set, return true if this IS a web request, but it didn't match
  349. +        * Always return false for non-web requests
  350. +        */
  351. +       test = info->invert ? !test : test;
  352. +   }
  353. +
  354. +   return test;
  355. +}
  356. +
  357. +
  358. +static bool match(const struct sk_buff *skb, struct xt_action_param *par)
  359. +{
  360. +
  361. +   const struct ipt_weburl_info *info = (const struct ipt_weburl_info*)(par->matchinfo);
  362. +
  363. +  
  364. +   int test = 0;
  365. +   struct iphdr* iph; 
  366. +
  367. +   /* linearize skb if necessary */
  368. +   struct sk_buff *linear_skb;
  369. +   int skb_copied;
  370. +   if(skb_is_nonlinear(skb))
  371. +   {
  372. +       linear_skb = skb_copy(skb, GFP_ATOMIC);
  373. +       skb_copied = 1;
  374. +   }
  375. +   else
  376. +   {
  377. +       linear_skb = (struct sk_buff*)skb;
  378. +       skb_copied = 0;
  379. +   }
  380. +
  381. +  
  382. +
  383. +   /* ignore packets that are not TCP */
  384. +   iph = (struct iphdr*)(skb_network_header(linear_skb));
  385. +   if(iph->protocol == IPPROTO_TCP)
  386. +   {
  387. +       /* get payload */
  388. +       struct tcphdr* tcp_hdr      = (struct tcphdr*)( ((unsigned char*)iph) + (iph->ihl*4) );
  389. +       unsigned short payload_offset   = (tcp_hdr->doff*4) + (iph->ihl*4);
  390. +       unsigned char* payload      = ((unsigned char*)iph) + payload_offset;
  391. +       unsigned short payload_length   = ntohs(iph->tot_len) - payload_offset;
  392. +
  393. +  
  394. +
  395. +       /* if payload length <= 10 bytes don't bother doing a check, otherwise check for match */
  396. +       if(payload_length > 10)
  397. +       {
  398. +           test = http_match(info, payload, payload_length);
  399. +       }
  400. +   }
  401. +  
  402. +   /* free skb if we made a copy to linearize it */
  403. +   if(skb_copied == 1)
  404. +   {
  405. +       kfree_skb(linear_skb);
  406. +   }
  407. +
  408. +
  409. +   /* printk("returning %d from weburl\n\n\n", test); */
  410. +   return test;
  411. +}
  412. +
  413. +
  414. +static int checkentry(const struct xt_mtchk_param *par)
  415. +{
  416. +   return 0;
  417. +}
  418. +
  419. +
  420. +static struct xt_match weburl_match  __read_mostly  =
  421. +{
  422. +   .name       = "weburl",
  423. +   .match      = &match,
  424. +   .family     = AF_INET,
  425. +   .matchsize  = sizeof(struct ipt_weburl_info),
  426. +   .checkentry = &checkentry,
  427. +   .me     = THIS_MODULE,
  428. +};
  429. +
  430. +static int __init init(void)
  431. +{
  432. +   compiled_map = NULL;
  433. +   return xt_register_match(&weburl_match);
  434. +
  435. +}
  436. +
  437. +static void __exit fini(void)
  438. +{
  439. +   xt_unregister_match(&weburl_match);
  440. +   if(compiled_map != NULL)
  441. +   {
  442. +       unsigned long num_destroyed;
  443. +       destroy_map(compiled_map, DESTROY_MODE_FREE_VALUES, &num_destroyed);
  444. +   }
  445. +}
  446. +
  447. +module_init(init);
  448. +module_exit(fini);
  449. +
  450. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  451. +++ b/net/ipv4/netfilter/ipt_weburl.mod.c   2015-01-26 07:43:59.997209775 +0300
  452. @@ -0,0 +1,23 @@
  453. +#include <linux/module.h>
  454. +#include <linux/vermagic.h>
  455. +#include <linux/compiler.h>
  456. +
  457. +MODULE_INFO(vermagic, VERMAGIC_STRING);
  458. +
  459. +__visible struct module __this_module
  460. +__attribute__((section(".gnu.linkonce.this_module"))) = {
  461. +   .name = KBUILD_MODNAME,
  462. +   .init = init_module,
  463. +#ifdef CONFIG_MODULE_UNLOAD
  464. +   .exit = cleanup_module,
  465. +#endif
  466. +   .arch = MODULE_ARCH_INIT,
  467. +};
  468. +
  469. +MODULE_INFO(intree, "Y");
  470. +
  471. +static const char __module_depends[]
  472. +__used
  473. +__attribute__((section(".modinfo"))) =
  474. +"depends=";
  475. +
  476. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  477. +++ b/net/ipv4/netfilter/weburl_deps/regexp.c   2015-01-25 11:36:00.000000000 +0300
  478. @@ -0,0 +1,1197 @@
  479. +/*
  480. + * regcomp and regexec -- regsub and regerror are elsewhere
  481. + * @(#)regexp.c    1.3 of 18 April 87
  482. + *
  483. + * Copyright (c) 1986 by University of Toronto.
  484. + * Written by Henry Spencer.  Not derived from licensed software.
  485. + *
  486. + * Permission is granted to anyone to use this software for any
  487. + * purpose on any computer system, and to redistribute it freely,
  488. + * subject to the following restrictions:
  489. + *
  490. + * 1. The author is not responsible for the consequences of use of
  491. + *     this software, no matter how awful, even if they arise
  492. + *     from defects in it.
  493. + *
  494. + * 2. The origin of this software must not be misrepresented, either
  495. + *     by explicit claim or by omission.
  496. + *
  497. + * 3. Altered versions must be plainly marked as such, and must not
  498. + *     be misrepresented as being the original software.
  499. + *
  500. + * Beware that some of this code is subtly aware of the way operator
  501. + * precedence is structured in regular expressions.  Serious changes in
  502. + * regular-expression syntax might require a total rethink.
  503. + *
  504. + * This code was modified by Ethan Sommer to work within the kernel
  505. + * (it now uses kmalloc etc..)
  506. + *
  507. + * Modified slightly by Matthew Strait to use more modern C.
  508. + */
  509. +
  510. +#include "regexp.h"
  511. +#include "regmagic.h"
  512. +
  513. +/* added by ethan and matt.  Lets it work in both kernel and user space.
  514. +(So iptables can use it, for instance.)  Yea, it goes both ways... */
  515. +#if __KERNEL__
  516. +  #define malloc(foo) kmalloc(foo,GFP_ATOMIC)
  517. +#else
  518. +  #define printk(format,args...) printf(format,##args)
  519. +#endif
  520. +
  521. +void regerror(char * s)
  522. +{
  523. +        printk("<3>Regexp: %s\n", s);
  524. +        /* NOTREACHED */
  525. +}
  526. +
  527. +/*
  528. + * The "internal use only" fields in regexp.h are present to pass info from
  529. + * compile to execute that permits the execute phase to run lots faster on
  530. + * simple cases.  They are:
  531. + *
  532. + * regstart    char that must begin a match; '\0' if none obvious
  533. + * reganch is the match anchored (at beginning-of-line only)?
  534. + * regmust string (pointer into program) that match must include, or NULL
  535. + * regmlen length of regmust string
  536. + *
  537. + * Regstart and reganch permit very fast decisions on suitable starting points
  538. + * for a match, cutting down the work a lot.  Regmust permits fast rejection
  539. + * of lines that cannot possibly match.  The regmust tests are costly enough
  540. + * that regcomp() supplies a regmust only if the r.e. contains something
  541. + * potentially expensive (at present, the only such thing detected is * or +
  542. + * at the start of the r.e., which can involve a lot of backup).  Regmlen is
  543. + * supplied because the test in regexec() needs it and regcomp() is computing
  544. + * it anyway.
  545. + */
  546. +
  547. +/*
  548. + * Structure for regexp "program".  This is essentially a linear encoding
  549. + * of a nondeterministic finite-state machine (aka syntax charts or
  550. + * "railroad normal form" in parsing technology).  Each node is an opcode
  551. + * plus a "next" pointer, possibly plus an operand.  "Next" pointers of
  552. + * all nodes except BRANCH implement concatenation; a "next" pointer with
  553. + * a BRANCH on both ends of it is connecting two alternatives.  (Here we
  554. + * have one of the subtle syntax dependencies:  an individual BRANCH (as
  555. + * opposed to a collection of them) is never concatenated with anything
  556. + * because of operator precedence.)  The operand of some types of node is
  557. + * a literal string; for others, it is a node leading into a sub-FSM.  In
  558. + * particular, the operand of a BRANCH node is the first node of the branch.
  559. + * (NB this is *not* a tree structure:  the tail of the branch connects
  560. + * to the thing following the set of BRANCHes.)  The opcodes are:
  561. + */
  562. +
  563. +/* definition  number  opnd?   meaning */
  564. +#define    END 0   /* no   End of program. */
  565. +#define    BOL 1   /* no   Match "" at beginning of line. */
  566. +#define    EOL 2   /* no   Match "" at end of line. */
  567. +#define    ANY 3   /* no   Match any one character. */
  568. +#define    ANYOF   4   /* str  Match any character in this string. */
  569. +#define    ANYBUT  5   /* str  Match any character not in this string. */
  570. +#define    BRANCH  6   /* node Match this alternative, or the next... */
  571. +#define    BACK    7   /* no   Match "", "next" ptr points backward. */
  572. +#define    EXACTLY 8   /* str  Match this string. */
  573. +#define    NOTHING 9   /* no   Match empty string. */
  574. +#define    STAR    10  /* node Match this (simple) thing 0 or more times. */
  575. +#define    PLUS    11  /* node Match this (simple) thing 1 or more times. */
  576. +#define    OPEN    20  /* no   Mark this point in input as start of #n. */
  577. +           /*  OPEN+1 is number 1, etc. */
  578. +#define    CLOSE   30  /* no   Analogous to OPEN. */
  579. +
  580. +/*
  581. + * Opcode notes:
  582. + *
  583. + * BRANCH  The set of branches constituting a single choice are hooked
  584. + *     together with their "next" pointers, since precedence prevents
  585. + *     anything being concatenated to any individual branch.  The
  586. + *     "next" pointer of the last BRANCH in a choice points to the
  587. + *     thing following the whole choice.  This is also where the
  588. + *     final "next" pointer of each individual branch points; each
  589. + *     branch starts with the operand node of a BRANCH node.
  590. + *
  591. + * BACK        Normal "next" pointers all implicitly point forward; BACK
  592. + *     exists to make loop structures possible.
  593. + *
  594. + * STAR,PLUS   '?', and complex '*' and '+', are implemented as circular
  595. + *     BRANCH structures using BACK.  Simple cases (one character
  596. + *     per match) are implemented with STAR and PLUS for speed
  597. + *     and to minimize recursive plunges.
  598. + *
  599. + * OPEN,CLOSE  ...are numbered at compile time.
  600. + */
  601. +
  602. +/*
  603. + * A node is one char of opcode followed by two chars of "next" pointer.
  604. + * "Next" pointers are stored as two 8-bit pieces, high order first.  The
  605. + * value is a positive offset from the opcode of the node containing it.
  606. + * An operand, if any, simply follows the node.  (Note that much of the
  607. + * code generation knows about this implicit relationship.)
  608. + *
  609. + * Using two bytes for the "next" pointer is vast overkill for most things,
  610. + * but allows patterns to get big without disasters.
  611. + */
  612. +#define    OP(p)   (*(p))
  613. +#define    NEXT(p) (((*((p)+1)&0377)<<8) + (*((p)+2)&0377))
  614. +#define    OPERAND(p)  ((p) + 3)
  615. +
  616. +/*
  617. + * See regmagic.h for one further detail of program structure.
  618. + */
  619. +
  620. +
  621. +/*
  622. + * Utility definitions.
  623. + */
  624. +#ifndef CHARBITS
  625. +#define    UCHARAT(p)  ((int)*(unsigned char *)(p))
  626. +#else
  627. +#define    UCHARAT(p)  ((int)*(p)&CHARBITS)
  628. +#endif
  629. +
  630. +#define    FAIL(m) { regerror(m); return(NULL); }
  631. +#define    ISMULT(c)   ((c) == '*' || (c) == '+' || (c) == '?')
  632. +#define    META    "^$.[()|?+*\\"
  633. +
  634. +/*
  635. + * Flags to be passed up and down.
  636. + */
  637. +#define    HASWIDTH    01  /* Known never to match null string. */
  638. +#define    SIMPLE      02  /* Simple enough to be STAR/PLUS operand. */
  639. +#define    SPSTART     04  /* Starts with * or +. */
  640. +#define    WORST       0   /* Worst case. */
  641. +
  642. +/*
  643. + * Global work variables for regcomp().
  644. + */
  645. +struct match_globals {
  646. +char *reginput;        /* String-input pointer. */
  647. +char *regbol;      /* Beginning of input, for ^ check. */
  648. +char **regstartp;  /* Pointer to startp array. */
  649. +char **regendp;        /* Ditto for endp. */
  650. +char *regparse;        /* Input-scan pointer. */
  651. +int regnpar;       /* () count. */
  652. +char regdummy;
  653. +char *regcode;     /* Code-emit pointer; &regdummy = don't. */
  654. +long regsize;      /* Code size. */
  655. +};
  656. +
  657. +/*
  658. + * Forward declarations for regcomp()'s friends.
  659. + */
  660. +#ifndef STATIC
  661. +#define    STATIC  static
  662. +#endif
  663. +STATIC char *reg(struct match_globals *g, int paren,int *flagp);
  664. +STATIC char *regbranch(struct match_globals *g, int *flagp);
  665. +STATIC char *regpiece(struct match_globals *g, int *flagp);
  666. +STATIC char *regatom(struct match_globals *g, int *flagp);
  667. +STATIC char *regnode(struct match_globals *g, char op);
  668. +STATIC char *regnext(struct match_globals *g, char *p);
  669. +STATIC void regc(struct match_globals *g, char b);
  670. +STATIC void reginsert(struct match_globals *g, char op, char *opnd);
  671. +STATIC void regtail(struct match_globals *g, char *p, char *val);
  672. +STATIC void regoptail(struct match_globals *g, char *p, char *val);
  673. +
  674. +
  675. +__kernel_size_t my_strcspn(const char *s1,const char *s2)
  676. +{
  677. +        char *scan1;
  678. +        char *scan2;
  679. +        int count;
  680. +
  681. +        count = 0;
  682. +        for (scan1 = (char *)s1; *scan1 != '\0'; scan1++) {
  683. +                for (scan2 = (char *)s2; *scan2 != '\0';)       /* ++ moved down. */
  684. +                        if (*scan1 == *scan2++)
  685. +                                return(count);
  686. +                count++;
  687. +        }
  688. +        return(count);
  689. +}
  690. +
  691. +/*
  692. + - regcomp - compile a regular expression into internal code
  693. + *
  694. + * We can't allocate space until we know how big the compiled form will be,
  695. + * but we can't compile it (and thus know how big it is) until we've got a
  696. + * place to put the code.  So we cheat:  we compile it twice, once with code
  697. + * generation turned off and size counting turned on, and once "for real".
  698. + * This also means that we don't allocate space until we are sure that the
  699. + * thing really will compile successfully, and we never have to move the
  700. + * code and thus invalidate pointers into it.  (Note that it has to be in
  701. + * one piece because free() must be able to free it all.)
  702. + *
  703. + * Beware that the optimization-preparation code in here knows about some
  704. + * of the structure of the compiled regexp.
  705. + */
  706. +regexp *
  707. +regcomp(char *exp,int *patternsize)
  708. +{
  709. +   register regexp *r;
  710. +   register char *scan;
  711. +   register char *longest;
  712. +   register int len;
  713. +   int flags;
  714. +   struct match_globals g;
  715. +
  716. +   /* commented out by ethan
  717. +      extern char *malloc();
  718. +   */
  719. +
  720. +   if (exp == NULL)
  721. +       FAIL("NULL argument");
  722. +
  723. +   /* First pass: determine size, legality. */
  724. +   g.regparse = exp;
  725. +   g.regnpar = 1;
  726. +   g.regsize = 0L;
  727. +   g.regcode = &g.regdummy;
  728. +   regc(&g, MAGIC);
  729. +   if (reg(&g, 0, &flags) == NULL)
  730. +       return(NULL);
  731. +
  732. +   /* Small enough for pointer-storage convention? */
  733. +   if (g.regsize >= 32767L)        /* Probably could be 65535L. */
  734. +       FAIL("regexp too big");
  735. +
  736. +   /* Allocate space. */
  737. +   *patternsize=sizeof(regexp) + (unsigned)g.regsize;
  738. +   r = (regexp *)malloc(sizeof(regexp) + (unsigned)g.regsize);
  739. +   if (r == NULL)
  740. +       FAIL("out of space");
  741. +
  742. +   /* Second pass: emit code. */
  743. +   g.regparse = exp;
  744. +   g.regnpar = 1;
  745. +   g.regcode = r->program;
  746. +   regc(&g, MAGIC);
  747. +   if (reg(&g, 0, &flags) == NULL)
  748. +       return(NULL);
  749. +
  750. +   /* Dig out information for optimizations. */
  751. +   r->regstart = '\0'; /* Worst-case defaults. */
  752. +   r->reganch = 0;
  753. +   r->regmust = NULL;
  754. +   r->regmlen = 0;
  755. +   scan = r->program+1;            /* First BRANCH. */
  756. +   if (OP(regnext(&g, scan)) == END) {     /* Only one top-level choice. */
  757. +       scan = OPERAND(scan);
  758. +
  759. +       /* Starting-point info. */
  760. +       if (OP(scan) == EXACTLY)
  761. +           r->regstart = *OPERAND(scan);
  762. +       else if (OP(scan) == BOL)
  763. +           r->reganch++;
  764. +
  765. +       /*
  766. +        * If there's something expensive in the r.e., find the
  767. +        * longest literal string that must appear and make it the
  768. +        * regmust.  Resolve ties in favor of later strings, since
  769. +        * the regstart check works with the beginning of the r.e.
  770. +        * and avoiding duplication strengthens checking.  Not a
  771. +        * strong reason, but sufficient in the absence of others.
  772. +        */
  773. +       if (flags&SPSTART) {
  774. +           longest = NULL;
  775. +           len = 0;
  776. +           for (; scan != NULL; scan = regnext(&g, scan))
  777. +               if (OP(scan) == EXACTLY && strlen(OPERAND(scan)) >= len) {
  778. +                   longest = OPERAND(scan);
  779. +                   len = strlen(OPERAND(scan));
  780. +               }
  781. +           r->regmust = longest;
  782. +           r->regmlen = len;
  783. +       }
  784. +   }
  785. +
  786. +   return(r);
  787. +}
  788. +
  789. +/*
  790. + - reg - regular expression, i.e. main body or parenthesized thing
  791. + *
  792. + * Caller must absorb opening parenthesis.
  793. + *
  794. + * Combining parenthesis handling with the base level of regular expression
  795. + * is a trifle forced, but the need to tie the tails of the branches to what
  796. + * follows makes it hard to avoid.
  797. + */
  798. +static char *
  799. +reg(struct match_globals *g, int paren, int *flagp /* Parenthesized? */ )
  800. +{
  801. +   register char *ret;
  802. +   register char *br;
  803. +   register char *ender;
  804. +   register int parno = 0; /* 0 makes gcc happy */
  805. +   int flags;
  806. +
  807. +   *flagp = HASWIDTH;  /* Tentatively. */
  808. +
  809. +   /* Make an OPEN node, if parenthesized. */
  810. +   if (paren) {
  811. +       if (g->regnpar >= NSUBEXP)
  812. +           FAIL("too many ()");
  813. +       parno = g->regnpar;
  814. +       g->regnpar++;
  815. +       ret = regnode(g, OPEN+parno);
  816. +   } else
  817. +       ret = NULL;
  818. +
  819. +   /* Pick up the branches, linking them together. */
  820. +   br = regbranch(g, &flags);
  821. +   if (br == NULL)
  822. +       return(NULL);
  823. +   if (ret != NULL)
  824. +       regtail(g, ret, br);    /* OPEN -> first. */
  825. +   else
  826. +       ret = br;
  827. +   if (!(flags&HASWIDTH))
  828. +       *flagp &= ~HASWIDTH;
  829. +   *flagp |= flags&SPSTART;
  830. +   while (*g->regparse == '|') {
  831. +       g->regparse++;
  832. +       br = regbranch(g, &flags);
  833. +       if (br == NULL)
  834. +           return(NULL);
  835. +       regtail(g, ret, br);    /* BRANCH -> BRANCH. */
  836. +       if (!(flags&HASWIDTH))
  837. +           *flagp &= ~HASWIDTH;
  838. +       *flagp |= flags&SPSTART;
  839. +   }
  840. +
  841. +   /* Make a closing node, and hook it on the end. */
  842. +   ender = regnode(g, (paren) ? CLOSE+parno : END);
  843. +   regtail(g, ret, ender);
  844. +
  845. +   /* Hook the tails of the branches to the closing node. */
  846. +   for (br = ret; br != NULL; br = regnext(g, br))
  847. +       regoptail(g, br, ender);
  848. +
  849. +   /* Check for proper termination. */
  850. +   if (paren && *g->regparse++ != ')') {
  851. +       FAIL("unmatched ()");
  852. +   } else if (!paren && *g->regparse != '\0') {
  853. +       if (*g->regparse == ')') {
  854. +           FAIL("unmatched ()");
  855. +       } else
  856. +           FAIL("junk on end");    /* "Can't happen". */
  857. +       /* NOTREACHED */
  858. +   }
  859. +
  860. +   return(ret);
  861. +}
  862. +
  863. +/*
  864. + - regbranch - one alternative of an | operator
  865. + *
  866. + * Implements the concatenation operator.
  867. + */
  868. +static char *
  869. +regbranch(struct match_globals *g, int *flagp)
  870. +{
  871. +   register char *ret;
  872. +   register char *chain;
  873. +   register char *latest;
  874. +   int flags;
  875. +
  876. +   *flagp = WORST;     /* Tentatively. */
  877. +
  878. +   ret = regnode(g, BRANCH);
  879. +   chain = NULL;
  880. +   while (*g->regparse != '\0' && *g->regparse != '|' && *g->regparse != ')') {
  881. +       latest = regpiece(g, &flags);
  882. +       if (latest == NULL)
  883. +           return(NULL);
  884. +       *flagp |= flags&HASWIDTH;
  885. +       if (chain == NULL)  /* First piece. */
  886. +           *flagp |= flags&SPSTART;
  887. +       else
  888. +           regtail(g, chain, latest);
  889. +       chain = latest;
  890. +   }
  891. +   if (chain == NULL)  /* Loop ran zero times. */
  892. +       (void) regnode(g, NOTHING);
  893. +
  894. +   return(ret);
  895. +}
  896. +
  897. +/*
  898. + - regpiece - something followed by possible [*+?]
  899. + *
  900. + * Note that the branching code sequences used for ? and the general cases
  901. + * of * and + are somewhat optimized:  they use the same NOTHING node as
  902. + * both the endmarker for their branch list and the body of the last branch.
  903. + * It might seem that this node could be dispensed with entirely, but the
  904. + * endmarker role is not redundant.
  905. + */
  906. +static char *
  907. +regpiece(struct match_globals *g, int *flagp)
  908. +{
  909. +   register char *ret;
  910. +   register char op;
  911. +   register char *next;
  912. +   int flags;
  913. +
  914. +   ret = regatom(g, &flags);
  915. +   if (ret == NULL)
  916. +       return(NULL);
  917. +
  918. +   op = *g->regparse;
  919. +   if (!ISMULT(op)) {
  920. +       *flagp = flags;
  921. +       return(ret);
  922. +   }
  923. +
  924. +   if (!(flags&HASWIDTH) && op != '?')
  925. +       FAIL("*+ operand could be empty");
  926. +   *flagp = (op != '+') ? (WORST|SPSTART) : (WORST|HASWIDTH);
  927. +
  928. +   if (op == '*' && (flags&SIMPLE))
  929. +       reginsert(g, STAR, ret);
  930. +   else if (op == '*') {
  931. +       /* Emit x* as (x&|), where & means "self". */
  932. +       reginsert(g, BRANCH, ret);          /* Either x */
  933. +       regoptail(g, ret, regnode(g, BACK));        /* and loop */
  934. +       regoptail(g, ret, ret);         /* back */
  935. +       regtail(g, ret, regnode(g, BRANCH));        /* or */
  936. +       regtail(g, ret, regnode(g, NOTHING));       /* null. */
  937. +   } else if (op == '+' && (flags&SIMPLE))
  938. +       reginsert(g, PLUS, ret);
  939. +   else if (op == '+') {
  940. +       /* Emit x+ as x(&|), where & means "self". */
  941. +       next = regnode(g, BRANCH);          /* Either */
  942. +       regtail(g, ret, next);
  943. +       regtail(g, regnode(g, BACK), ret);      /* loop back */
  944. +       regtail(g, next, regnode(g, BRANCH));       /* or */
  945. +       regtail(g, ret, regnode(g, NOTHING));       /* null. */
  946. +   } else if (op == '?') {
  947. +       /* Emit x? as (x|) */
  948. +       reginsert(g, BRANCH, ret);          /* Either x */
  949. +       regtail(g, ret, regnode(g, BRANCH));        /* or */
  950. +       next = regnode(g, NOTHING);     /* null. */
  951. +       regtail(g, ret, next);
  952. +       regoptail(g, ret, next);
  953. +   }
  954. +   g->regparse++;
  955. +   if (ISMULT(*g->regparse))
  956. +       FAIL("nested *?+");
  957. +
  958. +   return(ret);
  959. +}
  960. +
  961. +/*
  962. + - regatom - the lowest level
  963. + *
  964. + * Optimization:  gobbles an entire sequence of ordinary characters so that
  965. + * it can turn them into a single node, which is smaller to store and
  966. + * faster to run.  Backslashed characters are exceptions, each becoming a
  967. + * separate node; the code is simpler that way and it's not worth fixing.
  968. + */
  969. +static char *
  970. +regatom(struct match_globals *g, int *flagp)
  971. +{
  972. +   register char *ret;
  973. +   int flags;
  974. +
  975. +   *flagp = WORST;     /* Tentatively. */
  976. +
  977. +   switch (*g->regparse++) {
  978. +   case '^':
  979. +       ret = regnode(g, BOL);
  980. +       break;
  981. +   case '$':
  982. +       ret = regnode(g, EOL);
  983. +       break;
  984. +   case '.':
  985. +       ret = regnode(g, ANY);
  986. +       *flagp |= HASWIDTH|SIMPLE;
  987. +       break;
  988. +   case '[': {
  989. +           register int class;
  990. +           register int classend;
  991. +
  992. +           if (*g->regparse == '^') {  /* Complement of range. */
  993. +               ret = regnode(g, ANYBUT);
  994. +               g->regparse++;
  995. +           } else
  996. +               ret = regnode(g, ANYOF);
  997. +           if (*g->regparse == ']' || *g->regparse == '-')
  998. +               regc(g, *g->regparse++);
  999. +           while (*g->regparse != '\0' && *g->regparse != ']') {
  1000. +               if (*g->regparse == '-') {
  1001. +                   g->regparse++;
  1002. +                   if (*g->regparse == ']' || *g->regparse == '\0')
  1003. +                       regc(g, '-');
  1004. +                   else {
  1005. +                       class = UCHARAT(g->regparse-2)+1;
  1006. +                       classend = UCHARAT(g->regparse);
  1007. +                       if (class > classend+1)
  1008. +                           FAIL("invalid [] range");
  1009. +                       for (; class <= classend; class++)
  1010. +                           regc(g, class);
  1011. +                       g->regparse++;
  1012. +                   }
  1013. +               } else
  1014. +                   regc(g, *g->regparse++);
  1015. +           }
  1016. +           regc(g, '\0');
  1017. +           if (*g->regparse != ']')
  1018. +               FAIL("unmatched []");
  1019. +           g->regparse++;
  1020. +           *flagp |= HASWIDTH|SIMPLE;
  1021. +       }
  1022. +       break;
  1023. +   case '(':
  1024. +       ret = reg(g, 1, &flags);
  1025. +       if (ret == NULL)
  1026. +           return(NULL);
  1027. +       *flagp |= flags&(HASWIDTH|SPSTART);
  1028. +       break;
  1029. +   case '\0':
  1030. +   case '|':
  1031. +   case ')':
  1032. +       FAIL("internal urp");   /* Supposed to be caught earlier. */
  1033. +       break;
  1034. +   case '?':
  1035. +   case '+':
  1036. +   case '*':
  1037. +       FAIL("?+* follows nothing");
  1038. +       break;
  1039. +   case '\\':
  1040. +       if (*g->regparse == '\0')
  1041. +           FAIL("trailing \\");
  1042. +       ret = regnode(g, EXACTLY);
  1043. +       regc(g, *g->regparse++);
  1044. +       regc(g, '\0');
  1045. +       *flagp |= HASWIDTH|SIMPLE;
  1046. +       break;
  1047. +   default: {
  1048. +           register int len;
  1049. +           register char ender;
  1050. +
  1051. +           g->regparse--;
  1052. +           len = my_strcspn((const char *)g->regparse, (const char *)META);
  1053. +           if (len <= 0)
  1054. +               FAIL("internal disaster");
  1055. +           ender = *(g->regparse+len);
  1056. +           if (len > 1 && ISMULT(ender))
  1057. +               len--;      /* Back off clear of ?+* operand. */
  1058. +           *flagp |= HASWIDTH;
  1059. +           if (len == 1)
  1060. +               *flagp |= SIMPLE;
  1061. +           ret = regnode(g, EXACTLY);
  1062. +           while (len > 0) {
  1063. +               regc(g, *g->regparse++);
  1064. +               len--;
  1065. +           }
  1066. +           regc(g, '\0');
  1067. +       }
  1068. +       break;
  1069. +   }
  1070. +
  1071. +   return(ret);
  1072. +}
  1073. +
  1074. +/*
  1075. + - regnode - emit a node
  1076. + */
  1077. +static char *          /* Location. */
  1078. +regnode(struct match_globals *g, char op)
  1079. +{
  1080. +   register char *ret;
  1081. +   register char *ptr;
  1082. +
  1083. +   ret = g->regcode;
  1084. +   if (ret == &g->regdummy) {
  1085. +       g->regsize += 3;
  1086. +       return(ret);
  1087. +   }
  1088. +
  1089. +   ptr = ret;
  1090. +   *ptr++ = op;
  1091. +   *ptr++ = '\0';      /* Null "next" pointer. */
  1092. +   *ptr++ = '\0';
  1093. +   g->regcode = ptr;
  1094. +
  1095. +   return(ret);
  1096. +}
  1097. +
  1098. +/*
  1099. + - regc - emit (if appropriate) a byte of code
  1100. + */
  1101. +static void
  1102. +regc(struct match_globals *g, char b)
  1103. +{
  1104. +   if (g->regcode != &g->regdummy)
  1105. +       *g->regcode++ = b;
  1106. +   else
  1107. +       g->regsize++;
  1108. +}
  1109. +
  1110. +/*
  1111. + - reginsert - insert an operator in front of already-emitted operand
  1112. + *
  1113. + * Means relocating the operand.
  1114. + */
  1115. +static void
  1116. +reginsert(struct match_globals *g, char op, char* opnd)
  1117. +{
  1118. +   register char *src;
  1119. +   register char *dst;
  1120. +   register char *place;
  1121. +
  1122. +   if (g->regcode == &g->regdummy) {
  1123. +       g->regsize += 3;
  1124. +       return;
  1125. +   }
  1126. +
  1127. +   src = g->regcode;
  1128. +   g->regcode += 3;
  1129. +   dst = g->regcode;
  1130. +   while (src > opnd)
  1131. +       *--dst = *--src;
  1132. +
  1133. +   place = opnd;       /* Op node, where operand used to be. */
  1134. +   *place++ = op;
  1135. +   *place++ = '\0';
  1136. +   *place++ = '\0';
  1137. +}
  1138. +
  1139. +/*
  1140. + - regtail - set the next-pointer at the end of a node chain
  1141. + */
  1142. +static void
  1143. +regtail(struct match_globals *g, char *p, char *val)
  1144. +{
  1145. +   register char *scan;
  1146. +   register char *temp;
  1147. +   register int offset;
  1148. +
  1149. +   if (p == &g->regdummy)
  1150. +       return;
  1151. +
  1152. +   /* Find last node. */
  1153. +   scan = p;
  1154. +   for (;;) {
  1155. +       temp = regnext(g, scan);
  1156. +       if (temp == NULL)
  1157. +           break;
  1158. +       scan = temp;
  1159. +   }
  1160. +
  1161. +   if (OP(scan) == BACK)
  1162. +       offset = scan - val;
  1163. +   else
  1164. +       offset = val - scan;
  1165. +   *(scan+1) = (offset>>8)&0377;
  1166. +   *(scan+2) = offset&0377;
  1167. +}
  1168. +
  1169. +/*
  1170. + - regoptail - regtail on operand of first argument; nop if operandless
  1171. + */
  1172. +static void
  1173. +regoptail(struct match_globals *g, char *p, char *val)
  1174. +{
  1175. +   /* "Operandless" and "op != BRANCH" are synonymous in practice. */
  1176. +   if (p == NULL || p == &g->regdummy || OP(p) != BRANCH)
  1177. +       return;
  1178. +   regtail(g, OPERAND(p), val);
  1179. +}
  1180. +
  1181. +/*
  1182. + * regexec and friends
  1183. + */
  1184. +
  1185. +
  1186. +/*
  1187. + * Forwards.
  1188. + */
  1189. +STATIC int regtry(struct match_globals *g, regexp *prog, char *string);
  1190. +STATIC int regmatch(struct match_globals *g, char *prog);
  1191. +STATIC int regrepeat(struct match_globals *g, char *p);
  1192. +
  1193. +#ifdef DEBUG
  1194. +int regnarrate = 0;
  1195. +void regdump();
  1196. +STATIC char *regprop(char *op);
  1197. +#endif
  1198. +
  1199. +/*
  1200. + - regexec - match a regexp against a string
  1201. + */
  1202. +int
  1203. +regexec(regexp *prog, char *string)
  1204. +{
  1205. +   register char *s;
  1206. +   struct match_globals g;
  1207. +
  1208. +   /* Be paranoid... */
  1209. +   if (prog == NULL || string == NULL) {
  1210. +       printk("<3>Regexp: NULL parameter\n");
  1211. +       return(0);
  1212. +   }
  1213. +
  1214. +   /* Check validity of program. */
  1215. +   if (UCHARAT(prog->program) != MAGIC) {
  1216. +       printk("<3>Regexp: corrupted program\n");
  1217. +       return(0);
  1218. +   }
  1219. +
  1220. +   /* If there is a "must appear" string, look for it. */
  1221. +   if (prog->regmust != NULL) {
  1222. +       s = string;
  1223. +       while ((s = strchr(s, prog->regmust[0])) != NULL) {
  1224. +           if (strncmp(s, prog->regmust, prog->regmlen) == 0)
  1225. +               break;  /* Found it. */
  1226. +           s++;
  1227. +       }
  1228. +       if (s == NULL)  /* Not present. */
  1229. +           return(0);
  1230. +   }
  1231. +
  1232. +   /* Mark beginning of line for ^ . */
  1233. +   g.regbol = string;
  1234. +
  1235. +   /* Simplest case:  anchored match need be tried only once. */
  1236. +   if (prog->reganch)
  1237. +       return(regtry(&g, prog, string));
  1238. +
  1239. +   /* Messy cases:  unanchored match. */
  1240. +   s = string;
  1241. +   if (prog->regstart != '\0')
  1242. +       /* We know what char it must start with. */
  1243. +       while ((s = strchr(s, prog->regstart)) != NULL) {
  1244. +           if (regtry(&g, prog, s))
  1245. +               return(1);
  1246. +           s++;
  1247. +       }
  1248. +   else
  1249. +       /* We don't -- general case. */
  1250. +       do {
  1251. +           if (regtry(&g, prog, s))
  1252. +               return(1);
  1253. +       } while (*s++ != '\0');
  1254. +
  1255. +   /* Failure. */
  1256. +   return(0);
  1257. +}
  1258. +
  1259. +/*
  1260. + - regtry - try match at specific point
  1261. + */
  1262. +static int         /* 0 failure, 1 success */
  1263. +regtry(struct match_globals *g, regexp *prog, char *string)
  1264. +{
  1265. +   register int i;
  1266. +   register char **sp;
  1267. +   register char **ep;
  1268. +
  1269. +   g->reginput = string;
  1270. +   g->regstartp = prog->startp;
  1271. +   g->regendp = prog->endp;
  1272. +
  1273. +   sp = prog->startp;
  1274. +   ep = prog->endp;
  1275. +   for (i = NSUBEXP; i > 0; i--) {
  1276. +       *sp++ = NULL;
  1277. +       *ep++ = NULL;
  1278. +   }
  1279. +   if (regmatch(g, prog->program + 1)) {
  1280. +       prog->startp[0] = string;
  1281. +       prog->endp[0] = g->reginput;
  1282. +       return(1);
  1283. +   } else
  1284. +       return(0);
  1285. +}
  1286. +
  1287. +/*
  1288. + - regmatch - main matching routine
  1289. + *
  1290. + * Conceptually the strategy is simple:  check to see whether the current
  1291. + * node matches, call self recursively to see whether the rest matches,
  1292. + * and then act accordingly.  In practice we make some effort to avoid
  1293. + * recursion, in particular by going through "ordinary" nodes (that don't
  1294. + * need to know whether the rest of the match failed) by a loop instead of
  1295. + * by recursion.
  1296. + */
  1297. +static int         /* 0 failure, 1 success */
  1298. +regmatch(struct match_globals *g, char *prog)
  1299. +{
  1300. +   register char *scan = prog; /* Current node. */
  1301. +   char *next;         /* Next node. */
  1302. +
  1303. +#ifdef DEBUG
  1304. +   if (scan != NULL && regnarrate)
  1305. +       fprintf(stderr, "%s(\n", regprop(scan));
  1306. +#endif
  1307. +   while (scan != NULL) {
  1308. +#ifdef DEBUG
  1309. +       if (regnarrate)
  1310. +           fprintf(stderr, "%s...\n", regprop(scan));
  1311. +#endif
  1312. +       next = regnext(g, scan);
  1313. +
  1314. +       switch (OP(scan)) {
  1315. +       case BOL:
  1316. +           if (g->reginput != g->regbol)
  1317. +               return(0);
  1318. +           break;
  1319. +       case EOL:
  1320. +           if (*g->reginput != '\0')
  1321. +               return(0);
  1322. +           break;
  1323. +       case ANY:
  1324. +           if (*g->reginput == '\0')
  1325. +               return(0);
  1326. +           g->reginput++;
  1327. +           break;
  1328. +       case EXACTLY: {
  1329. +               register int len;
  1330. +               register char *opnd;
  1331. +
  1332. +               opnd = OPERAND(scan);
  1333. +               /* Inline the first character, for speed. */
  1334. +               if (*opnd != *g->reginput)
  1335. +                   return(0);
  1336. +               len = strlen(opnd);
  1337. +               if (len > 1 && strncmp(opnd, g->reginput, len) != 0)
  1338. +                   return(0);
  1339. +               g->reginput += len;
  1340. +           }
  1341. +           break;
  1342. +       case ANYOF:
  1343. +           if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) == NULL)
  1344. +               return(0);
  1345. +           g->reginput++;
  1346. +           break;
  1347. +       case ANYBUT:
  1348. +           if (*g->reginput == '\0' || strchr(OPERAND(scan), *g->reginput) != NULL)
  1349. +               return(0);
  1350. +           g->reginput++;
  1351. +           break;
  1352. +       case NOTHING:
  1353. +       case BACK:
  1354. +           break;
  1355. +       case OPEN+1:
  1356. +       case OPEN+2:
  1357. +       case OPEN+3:
  1358. +       case OPEN+4:
  1359. +       case OPEN+5:
  1360. +       case OPEN+6:
  1361. +       case OPEN+7:
  1362. +       case OPEN+8:
  1363. +       case OPEN+9: {
  1364. +               register int no;
  1365. +               register char *save;
  1366. +
  1367. +               no = OP(scan) - OPEN;
  1368. +               save = g->reginput;
  1369. +
  1370. +               if (regmatch(g, next)) {
  1371. +                   /*
  1372. +                    * Don't set startp if some later
  1373. +                    * invocation of the same parentheses
  1374. +                    * already has.
  1375. +                    */
  1376. +                   if (g->regstartp[no] == NULL)
  1377. +                       g->regstartp[no] = save;
  1378. +                   return(1);
  1379. +               } else
  1380. +                   return(0);
  1381. +           }
  1382. +           break;
  1383. +       case CLOSE+1:
  1384. +       case CLOSE+2:
  1385. +       case CLOSE+3:
  1386. +       case CLOSE+4:
  1387. +       case CLOSE+5:
  1388. +       case CLOSE+6:
  1389. +       case CLOSE+7:
  1390. +       case CLOSE+8:
  1391. +       case CLOSE+9:
  1392. +           {
  1393. +               register int no;
  1394. +               register char *save;
  1395. +
  1396. +               no = OP(scan) - CLOSE;
  1397. +               save = g->reginput;
  1398. +
  1399. +               if (regmatch(g, next)) {
  1400. +                   /*
  1401. +                    * Don't set endp if some later
  1402. +                    * invocation of the same parentheses
  1403. +                    * already has.
  1404. +                    */
  1405. +                   if (g->regendp[no] == NULL)
  1406. +                       g->regendp[no] = save;
  1407. +                   return(1);
  1408. +               } else
  1409. +                   return(0);
  1410. +           }
  1411. +           break;
  1412. +       case BRANCH: {
  1413. +               register char *save;
  1414. +
  1415. +               if (OP(next) != BRANCH)     /* No choice. */
  1416. +                   next = OPERAND(scan);   /* Avoid recursion. */
  1417. +               else {
  1418. +                   do {
  1419. +                       save = g->reginput;
  1420. +                       if (regmatch(g, OPERAND(scan)))
  1421. +                           return(1);
  1422. +                       g->reginput = save;
  1423. +                       scan = regnext(g, scan);
  1424. +                   } while (scan != NULL && OP(scan) == BRANCH);
  1425. +                   return(0);
  1426. +                   /* NOTREACHED */
  1427. +               }
  1428. +           }
  1429. +           break;
  1430. +       case STAR:
  1431. +       case PLUS: {
  1432. +               register char nextch;
  1433. +               register int no;
  1434. +               register char *save;
  1435. +               register int min;
  1436. +
  1437. +               /*
  1438. +                * Lookahead to avoid useless match attempts
  1439. +                * when we know what character comes next.
  1440. +                */
  1441. +               nextch = '\0';
  1442. +               if (OP(next) == EXACTLY)
  1443. +                   nextch = *OPERAND(next);
  1444. +               min = (OP(scan) == STAR) ? 0 : 1;
  1445. +               save = g->reginput;
  1446. +               no = regrepeat(g, OPERAND(scan));
  1447. +               while (no >= min) {
  1448. +                   /* If it could work, try it. */
  1449. +                   if (nextch == '\0' || *g->reginput == nextch)
  1450. +                       if (regmatch(g, next))
  1451. +                           return(1);
  1452. +                   /* Couldn't or didn't -- back up. */
  1453. +                   no--;
  1454. +                   g->reginput = save + no;
  1455. +               }
  1456. +               return(0);
  1457. +           }
  1458. +           break;
  1459. +       case END:
  1460. +           return(1);  /* Success! */
  1461. +           break;
  1462. +       default:
  1463. +           printk("<3>Regexp: memory corruption\n");
  1464. +           return(0);
  1465. +           break;
  1466. +       }
  1467. +
  1468. +       scan = next;
  1469. +   }
  1470. +
  1471. +   /*
  1472. +    * We get here only if there's trouble -- normally "case END" is
  1473. +    * the terminating point.
  1474. +    */
  1475. +   printk("<3>Regexp: corrupted pointers\n");
  1476. +   return(0);
  1477. +}
  1478. +
  1479. +/*
  1480. + - regrepeat - repeatedly match something simple, report how many
  1481. + */
  1482. +static int
  1483. +regrepeat(struct match_globals *g, char *p)
  1484. +{
  1485. +   register int count = 0;
  1486. +   register char *scan;
  1487. +   register char *opnd;
  1488. +
  1489. +   scan = g->reginput;
  1490. +   opnd = OPERAND(p);
  1491. +   switch (OP(p)) {
  1492. +   case ANY:
  1493. +       count = strlen(scan);
  1494. +       scan += count;
  1495. +       break;
  1496. +   case EXACTLY:
  1497. +       while (*opnd == *scan) {
  1498. +           count++;
  1499. +           scan++;
  1500. +       }
  1501. +       break;
  1502. +   case ANYOF:
  1503. +       while (*scan != '\0' && strchr(opnd, *scan) != NULL) {
  1504. +           count++;
  1505. +           scan++;
  1506. +       }
  1507. +       break;
  1508. +   case ANYBUT:
  1509. +       while (*scan != '\0' && strchr(opnd, *scan) == NULL) {
  1510. +           count++;
  1511. +           scan++;
  1512. +       }
  1513. +       break;
  1514. +   default:        /* Oh dear.  Called inappropriately. */
  1515. +       printk("<3>Regexp: internal foulup\n");
  1516. +       count = 0;  /* Best compromise. */
  1517. +       break;
  1518. +   }
  1519. +   g->reginput = scan;
  1520. +
  1521. +   return(count);
  1522. +}
  1523. +
  1524. +/*
  1525. + - regnext - dig the "next" pointer out of a node
  1526. + */
  1527. +static char*
  1528. +regnext(struct match_globals *g, char *p)
  1529. +{
  1530. +   register int offset;
  1531. +
  1532. +   if (p == &g->regdummy)
  1533. +       return(NULL);
  1534. +
  1535. +   offset = NEXT(p);
  1536. +   if (offset == 0)
  1537. +       return(NULL);
  1538. +
  1539. +   if (OP(p) == BACK)
  1540. +       return(p-offset);
  1541. +   else
  1542. +       return(p+offset);
  1543. +}
  1544. +
  1545. +#ifdef DEBUG
  1546. +
  1547. +STATIC char *regprop();
  1548. +
  1549. +/*
  1550. + - regdump - dump a regexp onto stdout in vaguely comprehensible form
  1551. + */
  1552. +void
  1553. +regdump(regexp *r)
  1554. +{
  1555. +   register char *s;
  1556. +   register char op = EXACTLY; /* Arbitrary non-END op. */
  1557. +   register char *next;
  1558. +   /* extern char *strchr(); */
  1559. +
  1560. +
  1561. +   s = r->program + 1;
  1562. +   while (op != END) { /* While that wasn't END last time... */
  1563. +       op = OP(s);
  1564. +       printf("%2d%s", s-r->program, regprop(s));  /* Where, what. */
  1565. +       next = regnext(s);
  1566. +       if (next == NULL)       /* Next ptr. */
  1567. +           printf("(0)");
  1568. +       else
  1569. +           printf("(%d)", (s-r->program)+(next-s));
  1570. +       s += 3;
  1571. +       if (op == ANYOF || op == ANYBUT || op == EXACTLY) {
  1572. +           /* Literal string, where present. */
  1573. +           while (*s != '\0') {
  1574. +               putchar(*s);
  1575. +               s++;
  1576. +           }
  1577. +           s++;
  1578. +       }
  1579. +       putchar('\n');
  1580. +   }
  1581. +
  1582. +   /* Header fields of interest. */
  1583. +   if (r->regstart != '\0')
  1584. +       printf("start `%c' ", r->regstart);
  1585. +   if (r->reganch)
  1586. +       printf("anchored ");
  1587. +   if (r->regmust != NULL)
  1588. +       printf("must have \"%s\"", r->regmust);
  1589. +   printf("\n");
  1590. +}
  1591. +
  1592. +/*
  1593. + - regprop - printable representation of opcode
  1594. + */
  1595. +static char *
  1596. +regprop(char *op)
  1597. +{
  1598. +#define BUFLEN 50
  1599. +   register char *p;
  1600. +   static char buf[BUFLEN];
  1601. +
  1602. +   strcpy(buf, ":");
  1603. +
  1604. +   switch (OP(op)) {
  1605. +   case BOL:
  1606. +       p = "BOL";
  1607. +       break;
  1608. +   case EOL:
  1609. +       p = "EOL";
  1610. +       break;
  1611. +   case ANY:
  1612. +       p = "ANY";
  1613. +       break;
  1614. +   case ANYOF:
  1615. +       p = "ANYOF";
  1616. +       break;
  1617. +   case ANYBUT:
  1618. +       p = "ANYBUT";
  1619. +       break;
  1620. +   case BRANCH:
  1621. +       p = "BRANCH";
  1622. +       break;
  1623. +   case EXACTLY:
  1624. +       p = "EXACTLY";
  1625. +       break;
  1626. +   case NOTHING:
  1627. +       p = "NOTHING";
  1628. +       break;
  1629. +   case BACK:
  1630. +       p = "BACK";
  1631. +       break;
  1632. +   case END:
  1633. +       p = "END";
  1634. +       break;
  1635. +   case OPEN+1:
  1636. +   case OPEN+2:
  1637. +   case OPEN+3:
  1638. +   case OPEN+4:
  1639. +   case OPEN+5:
  1640. +   case OPEN+6:
  1641. +   case OPEN+7:
  1642. +   case OPEN+8:
  1643. +   case OPEN+9:
  1644. +       snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "OPEN%d", OP(op)-OPEN);
  1645. +       p = NULL;
  1646. +       break;
  1647. +   case CLOSE+1:
  1648. +   case CLOSE+2:
  1649. +   case CLOSE+3:
  1650. +   case CLOSE+4:
  1651. +   case CLOSE+5:
  1652. +   case CLOSE+6:
  1653. +   case CLOSE+7:
  1654. +   case CLOSE+8:
  1655. +   case CLOSE+9:
  1656. +       snprintf(buf+strlen(buf),BUFLEN-strlen(buf), "CLOSE%d", OP(op)-CLOSE);
  1657. +       p = NULL;
  1658. +       break;
  1659. +   case STAR:
  1660. +       p = "STAR";
  1661. +       break;
  1662. +   case PLUS:
  1663. +       p = "PLUS";
  1664. +       break;
  1665. +   default:
  1666. +       printk("<3>Regexp: corrupted opcode\n");
  1667. +       break;
  1668. +   }
  1669. +   if (p != NULL)
  1670. +       strncat(buf, p, BUFLEN-strlen(buf));
  1671. +   return(buf);
  1672. +}
  1673. +#endif
  1674. +
  1675. +
  1676. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  1677. +++ b/net/ipv4/netfilter/weburl_deps/regexp.h   2015-01-25 11:36:00.000000000 +0300
  1678. @@ -0,0 +1,41 @@
  1679. +/*
  1680. + * Definitions etc. for regexp(3) routines.
  1681. + *
  1682. + * Caveat:  this is V8 regexp(3) [actually, a reimplementation thereof],
  1683. + * not the System V one.
  1684. + */
  1685. +
  1686. +#ifndef REGEXP_H
  1687. +#define REGEXP_H
  1688. +
  1689. +
  1690. +/*
  1691. +http://www.opensource.apple.com/darwinsource/10.3/expect-1/expect/expect.h ,
  1692. +which contains a version of this library, says:
  1693. +
  1694. + *
  1695. + * NSUBEXP must be at least 10, and no greater than 117 or the parser
  1696. + * will not work properly.
  1697. + *
  1698. +
  1699. +However, it looks rather like this library is limited to 10.  If you think
  1700. +otherwise, let us know.
  1701. +*/
  1702. +
  1703. +#define NSUBEXP  10
  1704. +typedef struct regexp {
  1705. +   char *startp[NSUBEXP];
  1706. +   char *endp[NSUBEXP];
  1707. +   char regstart;      /* Internal use only. */
  1708. +   char reganch;       /* Internal use only. */
  1709. +   char *regmust;      /* Internal use only. */
  1710. +   int regmlen;        /* Internal use only. */
  1711. +   char program[1];    /* Unwarranted chumminess with compiler. */
  1712. +} regexp;
  1713. +
  1714. +regexp * regcomp(char *exp, int *patternsize);
  1715. +int regexec(regexp *prog, char *string);
  1716. +void regsub(regexp *prog, char *source, char *dest);
  1717. +void regerror(char *s);
  1718. +
  1719. +#endif
  1720. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  1721. +++ b/net/ipv4/netfilter/weburl_deps/regmagic.h 2015-01-25 11:36:00.000000000 +0300
  1722. @@ -0,0 +1,5 @@
  1723. +/*
  1724. + * The first byte of the regexp internal "program" is actually this magic
  1725. + * number; the start node begins in the second byte.
  1726. + */
  1727. +#define    MAGIC   0234
  1728. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  1729. +++ b/net/ipv4/netfilter/weburl_deps/regsub.c   2015-01-25 11:35:00.000000000 +0300
  1730. @@ -0,0 +1,95 @@
  1731. +/*
  1732. + * regsub
  1733. + * @(#)regsub.c    1.3 of 2 April 86
  1734. + *
  1735. + * Copyright (c) 1986 by University of Toronto.
  1736. + * Written by Henry Spencer.  Not derived from licensed software.
  1737. + *
  1738. + * Permission is granted to anyone to use this software for any
  1739. + * purpose on any computer system, and to redistribute it freely,
  1740. + * subject to the following restrictions:
  1741. + *
  1742. + * 1. The author is not responsible for the consequences of use of
  1743. + *     this software, no matter how awful, even if they arise
  1744. + *     from defects in it.
  1745. + *
  1746. + * 2. The origin of this software must not be misrepresented, either
  1747. + *     by explicit claim or by omission.
  1748. + *
  1749. + * 3. Altered versions must be plainly marked as such, and must not
  1750. + *     be misrepresented as being the original software.
  1751. + *
  1752. + *
  1753. + * This code was modified by Ethan Sommer to work within the kernel
  1754. + * (it now uses kmalloc etc..)
  1755. + *
  1756. + */
  1757. +#include "regexp.h"
  1758. +#include "regmagic.h"
  1759. +#include <linux/string.h>
  1760. +
  1761. +
  1762. +#ifndef CHARBITS
  1763. +#define    UCHARAT(p)  ((int)*(unsigned char *)(p))
  1764. +#else
  1765. +#define    UCHARAT(p)  ((int)*(p)&CHARBITS)
  1766. +#endif
  1767. +
  1768. +#if 0
  1769. +//void regerror(char * s)
  1770. +//{
  1771. +//        printk("regexp(3): %s", s);
  1772. +//        /* NOTREACHED */
  1773. +//}
  1774. +#endif
  1775. +
  1776. +/*
  1777. + - regsub - perform substitutions after a regexp match
  1778. + */
  1779. +void
  1780. +regsub(regexp * prog, char * source, char * dest)
  1781. +{
  1782. +   register char *src;
  1783. +   register char *dst;
  1784. +   register char c;
  1785. +   register int no;
  1786. +   register int len;
  1787. +
  1788. +   /* Not necessary and gcc doesn't like it -MLS */
  1789. +   /*extern char *strncpy();*/
  1790. +
  1791. +   if (prog == NULL || source == NULL || dest == NULL) {
  1792. +       regerror("NULL parm to regsub");
  1793. +       return;
  1794. +   }
  1795. +   if (UCHARAT(prog->program) != MAGIC) {
  1796. +       regerror("damaged regexp fed to regsub");
  1797. +       return;
  1798. +   }
  1799. +
  1800. +   src = source;
  1801. +   dst = dest;
  1802. +   while ((c = *src++) != '\0') {
  1803. +       if (c == '&')
  1804. +           no = 0;
  1805. +       else if (c == '\\' && '0' <= *src && *src <= '9')
  1806. +           no = *src++ - '0';
  1807. +       else
  1808. +           no = -1;
  1809. +
  1810. +       if (no < 0) {   /* Ordinary character. */
  1811. +           if (c == '\\' && (*src == '\\' || *src == '&'))
  1812. +               c = *src++;
  1813. +           *dst++ = c;
  1814. +       } else if (prog->startp[no] != NULL && prog->endp[no] != NULL) {
  1815. +           len = prog->endp[no] - prog->startp[no];
  1816. +           (void) strncpy(dst, prog->startp[no], len);
  1817. +           dst += len;
  1818. +           if (len != 0 && *(dst-1) == '\0') { /* strncpy hit NUL. */
  1819. +               regerror("damaged match string");
  1820. +               return;
  1821. +           }
  1822. +       }
  1823. +   }
  1824. +   *dst++ = '\0';
  1825. +}
  1826. --- /dev/null   2015-01-27 10:36:31.203991198 +0300
  1827. +++ b/net/ipv4/netfilter/weburl_deps/tree_map.h 2015-01-25 11:35:00.000000000 +0300
  1828. @@ -0,0 +1,1084 @@
  1829. +/*
  1830. + * Copyright © 2008 by Eric Bishop <eric@gargoyle-router.com>
  1831. + *
  1832. + * This work 'as-is' we provide.
  1833. + * No warranty, express or implied.
  1834. + * We've done our best,
  1835. + * to debug and test.
  1836. + * Liability for damages denied.
  1837. + *
  1838. + * Permission is granted hereby,
  1839. + * to copy, share, and modify.
  1840. + * Use as is fit,
  1841. + * free or for profit.
  1842. + * On this notice these rights rely.
  1843. + *
  1844. + *
  1845. + *
  1846. + *  Note that unlike other portions of Gargoyle this code
  1847. + *  does not fall under the GPL, but the rather whimsical
  1848. + *  'Poetic License' above.
  1849. + *
  1850. + *  Basically, this library contains a bunch of utilities
  1851. + *  that I find useful.  I'm sure other libraries exist
  1852. + *  that are just as good or better, but I like these tools
  1853. + *  because I personally wrote them, so I know their quirks.
  1854. + *  (i.e. I know where the bodies are buried).  I want to
  1855. + *  make sure that I can re-use these utilities for whatever
  1856. + *  code I may want to write in the future be it
  1857. + *  proprietary or open-source, so I've put them under
  1858. + *  a very, very permissive license.
  1859. + *
  1860. + *  If you find this code useful, use it.  If not, don't.
  1861. + *  I really don't care.
  1862. + *
  1863. + */
  1864. +
  1865. +
  1866. +#if __KERNEL__
  1867. +   #define malloc(foo) kmalloc(foo,GFP_ATOMIC)
  1868. +   #define free(foo)   kfree(foo)
  1869. +   #define printf(format,args...)  printk(format,##args)
  1870. +
  1871. +   /* kernel strdup */
  1872. +   static inline char *kernel_strdup(const char *str);
  1873. +   static inline char *kernel_strdup(const char *str)
  1874. +   {
  1875. +       char *tmp;
  1876. +       long int s;
  1877. +       s=strlen(str) + 1;
  1878. +       tmp = kmalloc(s, GFP_ATOMIC);
  1879. +       if (tmp != NULL)
  1880. +       {
  1881. +           memcpy(tmp, str, s);
  1882. +       }
  1883. +       return tmp;
  1884. +   }
  1885. +   #define strdup kernel_strdup
  1886. +
  1887. +#endif
  1888. +
  1889. +
  1890. +
  1891. +/* tree_map structs / prototypes */
  1892. +typedef struct long_tree_map_node
  1893. +{
  1894. +   unsigned long key;
  1895. +   void* value;
  1896. +  
  1897. +   signed char balance;
  1898. +   struct long_tree_map_node* left;
  1899. +   struct long_tree_map_node* right;
  1900. +} long_map_node;
  1901. +
  1902. +typedef struct
  1903. +{
  1904. +   long_map_node* root;
  1905. +   unsigned long num_elements;
  1906. +
  1907. +}long_map;
  1908. +
  1909. +typedef struct
  1910. +{
  1911. +   long_map lm;
  1912. +   unsigned char store_keys;
  1913. +   unsigned long num_elements;
  1914. +
  1915. +}string_map;
  1916. +
  1917. +
  1918. +
  1919. +/* long map functions */
  1920. +long_map* initialize_long_map(void);
  1921. +void* get_long_map_element(long_map* map, unsigned long key);
  1922. +void* get_smallest_long_map_element(long_map* map, unsigned long* smallest_key);
  1923. +void* get_largest_long_map_element(long_map* map, unsigned long* largest_key);
  1924. +void* remove_smallest_long_map_element(long_map* map, unsigned long* smallest_key);
  1925. +void* remove_largest_long_map_element(long_map* map, unsigned long* largest_key);
  1926. +void* set_long_map_element(long_map* map, unsigned long key, void* value);
  1927. +void* remove_long_map_element(long_map* map, unsigned long key);
  1928. +unsigned long* get_sorted_long_map_keys(long_map* map, unsigned long* num_keys_returned);
  1929. +void** get_sorted_long_map_values(long_map* map, unsigned long* num_values_returned);
  1930. +void** destroy_long_map(long_map* map, int destruction_type, unsigned long* num_destroyed);
  1931. +void apply_to_every_long_map_value(long_map* map, void (*apply_func)(unsigned long key, void* value));
  1932. +
  1933. +/* string map functions */
  1934. +string_map* initialize_string_map(unsigned char store_keys);
  1935. +void* get_string_map_element(string_map* map, const char* key);
  1936. +void* set_string_map_element(string_map* map, const char* key, void* value);
  1937. +void* remove_string_map_element(string_map* map, const char* key);
  1938. +char** get_string_map_keys(string_map* map, unsigned long* num_keys_returned);
  1939. +void** get_string_map_values(string_map* map, unsigned long* num_values_returned);
  1940. +void** destroy_string_map(string_map* map, int destruction_type, unsigned long* num_destroyed);
  1941. +void apply_to_every_string_map_value(string_map* map, void (*apply_func)(char* key, void* value));
  1942. +
  1943. +
  1944. +/*
  1945. + * three different ways to deal with values when data structure is destroyed
  1946. + */
  1947. +#define DESTROY_MODE_RETURN_VALUES 20
  1948. +#define DESTROY_MODE_FREE_VALUES   21
  1949. +#define DESTROY_MODE_IGNORE_VALUES 22
  1950. +
  1951. +
  1952. +/*
  1953. + * for convenience & backwards compatibility alias _string_map_ functions to
  1954. + *  _map_ functions since string map is used more often than long map
  1955. + */
  1956. +#define initialize_map     initialize_string_map
  1957. +#define set_map_element        set_string_map_element
  1958. +#define get_map_element        get_string_map_element
  1959. +#define remove_map_element remove_string_map_element
  1960. +#define get_map_keys       get_string_map_keys
  1961. +#define get_map_values     get_string_map_values
  1962. +#define destroy_map        destroy_string_map
  1963. +
  1964. +
  1965. +/* internal utility structures/ functions */
  1966. +typedef struct stack_node_struct
  1967. +{
  1968. +   long_map_node** node_ptr;
  1969. +   signed char direction;
  1970. +   struct stack_node_struct* previous;
  1971. +} stack_node;
  1972. +
  1973. +static void free_stack(stack_node* stack);
  1974. +static void** destroy_long_map_values(long_map* map, int destruction_type, unsigned long* num_destroyed);
  1975. +static void apply_to_every_long_map_node(long_map_node* node, void (*apply_func)(unsigned long key, void* value));
  1976. +static void apply_to_every_string_map_node(long_map_node* node, unsigned char has_key, void (*apply_func)(char* key, void* value));
  1977. +static void get_sorted_node_keys(long_map_node* node, unsigned long* key_list, unsigned long* next_key_index, int depth);
  1978. +static void get_sorted_node_values(long_map_node* node, void** value_list, unsigned long* next_value_index, int depth);
  1979. +static signed char rebalance (long_map_node** n, signed char direction, signed char update_op);
  1980. +static void rotate_right (long_map_node** parent);
  1981. +static void rotate_left (long_map_node** parent);
  1982. +
  1983. +/* internal for string map */
  1984. +typedef struct
  1985. +{
  1986. +   char* key;
  1987. +   void* value;
  1988. +} string_map_key_value;
  1989. +static unsigned long sdbm_string_hash(const char *key);
  1990. +
  1991. +
  1992. +
  1993. +
  1994. +/***************************************************
  1995. + * For testing only
  1996. + ***************************************************/
  1997. +/*
  1998. +void print_list(stack_node *l);
  1999. +
  2000. +void print_list(stack_node *l)
  2001. +{
  2002. +   if(l != NULL)
  2003. +   {
  2004. +       printf(" list key = %ld, dir=%d, \n", (*(l->node_ptr))->key, l->direction);
  2005. +       print_list(l->previous);
  2006. +   }
  2007. +}
  2008. +*/
  2009. +/******************************************************
  2010. + * End testing Code
  2011. + *******************************************************/
  2012. +
  2013. +
  2014. +
  2015. +
  2016. +/***************************************************
  2017. + * string_map function definitions
  2018. + ***************************************************/
  2019. +
  2020. +string_map* initialize_string_map(unsigned char store_keys)
  2021. +{
  2022. +   string_map* map = (string_map*)malloc(sizeof(string_map));
  2023. +   if(map != NULL)
  2024. +   {
  2025. +       map->store_keys = store_keys;
  2026. +       map->lm.root = NULL;
  2027. +       map->lm.num_elements = 0;
  2028. +       map->num_elements = map->lm.num_elements;
  2029. +   }
  2030. +   return map;
  2031. +}
  2032. +
  2033. +void* get_string_map_element(string_map* map, const char* key)
  2034. +{
  2035. +   unsigned long hashed_key = sdbm_string_hash(key);
  2036. +   void* return_value =  get_long_map_element( &(map->lm), hashed_key);
  2037. +   if(return_value != NULL && map->store_keys)
  2038. +   {
  2039. +       string_map_key_value* r = (string_map_key_value*)return_value;
  2040. +       return_value = r->value;
  2041. +   }
  2042. +   map->num_elements = map->lm.num_elements;
  2043. +   return return_value;
  2044. +}
  2045. +
  2046. +void* set_string_map_element(string_map* map, const char* key, void* value)
  2047. +{
  2048. +   unsigned long hashed_key = sdbm_string_hash(key);
  2049. +   void* return_value = NULL;
  2050. +   if(map->store_keys)
  2051. +   {
  2052. +       string_map_key_value* kv = (string_map_key_value*)malloc(sizeof(string_map_key_value));
  2053. +       if(kv == NULL) /* deal with malloc failure */
  2054. +       {
  2055. +           return NULL;
  2056. +       }
  2057. +       kv->key = strdup(key);
  2058. +       if(kv->key == NULL) /* deal with malloc failure */
  2059. +       {
  2060. +           free(kv);
  2061. +           return NULL;
  2062. +       }
  2063. +       kv->value = value;
  2064. +       return_value = set_long_map_element(  &(map->lm), hashed_key, kv);
  2065. +       if(return_value != NULL)
  2066. +       {
  2067. +           string_map_key_value* r = (string_map_key_value*)return_value;
  2068. +           return_value = r->value;
  2069. +           free(r->key);
  2070. +           free(r);
  2071. +       }
  2072. +   }
  2073. +   else
  2074. +   {
  2075. +       return_value = set_long_map_element( &(map->lm), hashed_key, value);
  2076. +   }
  2077. +   map->num_elements = map->lm.num_elements;
  2078. +   return return_value;
  2079. +}
  2080. +
  2081. +void* remove_string_map_element(string_map* map, const char* key)
  2082. +{
  2083. +   unsigned long hashed_key = sdbm_string_hash(key);
  2084. +   void* return_value =  remove_long_map_element( &(map->lm), hashed_key);
  2085. +  
  2086. +   if(return_value != NULL && map->store_keys)
  2087. +   {
  2088. +       string_map_key_value* r = (string_map_key_value*)return_value;
  2089. +       return_value = r->value;
  2090. +       free(r->key);
  2091. +       free(r);
  2092. +   }
  2093. +   map->num_elements = map->lm.num_elements;
  2094. +   return return_value;
  2095. +}
  2096. +
  2097. +char** get_string_map_keys(string_map* map, unsigned long* num_keys_returned)
  2098. +{
  2099. +   char** str_keys;
  2100. +   str_keys = (char**)malloc((map->num_elements+1)*sizeof(char*));
  2101. +   if(str_keys == NULL) /* deal with malloc failure */
  2102. +   {
  2103. +       return NULL;
  2104. +   }
  2105. +   str_keys[0] = NULL;
  2106. +   *num_keys_returned = 0;
  2107. +   if(map->store_keys && map->num_elements > 0)
  2108. +   {
  2109. +       unsigned long list_length;
  2110. +       void** long_values = get_sorted_long_map_values( &(map->lm),  &list_length);
  2111. +       unsigned long key_index;
  2112. +       /*list_length will be 0 on malloc failure in get_sorted_long_map_values, so this code shouldn't seg fault if that happens */
  2113. +       for(key_index = 0; key_index < list_length; key_index++)
  2114. +       {
  2115. +           str_keys[key_index] = strdup( ((string_map_key_value*)(long_values[key_index]))->key);
  2116. +           if(str_keys[key_index] == NULL) /* deal with malloc failure */
  2117. +           {
  2118. +               //just return the incomplete list (hey, it's null terminated...)
  2119. +               free(long_values);
  2120. +               return str_keys;
  2121. +           }
  2122. +           *num_keys_returned = *num_keys_returned + 1;
  2123. +       }
  2124. +       str_keys[list_length] = NULL;
  2125. +       free(long_values);
  2126. +   }
  2127. +   return str_keys;
  2128. +}
  2129. +
  2130. +
  2131. +void** get_string_map_values(string_map* map, unsigned long* num_values_returned)
  2132. +{
  2133. +   void** values = NULL;
  2134. +   if(map != NULL)
  2135. +   {
  2136. +       values = get_sorted_long_map_values ( &(map->lm), num_values_returned );
  2137. +   }
  2138. +   return values;
  2139. +}
  2140. +
  2141. +
  2142. +void** destroy_string_map(string_map* map, int destruction_type, unsigned long* num_destroyed)
  2143. +{
  2144. +   void** return_values = NULL;
  2145. +   if(map != NULL)
  2146. +   {
  2147. +       if(map->store_keys)
  2148. +       {
  2149. +           void** kvs = destroy_long_map_values( &(map->lm), DESTROY_MODE_RETURN_VALUES, num_destroyed );
  2150. +           unsigned long kv_index = 0;
  2151. +           for(kv_index=0; kv_index < *num_destroyed; kv_index++)
  2152. +           {
  2153. +               string_map_key_value* kv = (string_map_key_value*)kvs[kv_index];
  2154. +               void* value = kv->value;
  2155. +              
  2156. +               free(kv->key);
  2157. +               free(kv);
  2158. +               if(destruction_type == DESTROY_MODE_FREE_VALUES)
  2159. +               {
  2160. +                   free(value);
  2161. +               }
  2162. +               if(destruction_type == DESTROY_MODE_RETURN_VALUES)
  2163. +               {
  2164. +                   kvs[kv_index] = value;
  2165. +               }
  2166. +           }
  2167. +           if(destruction_type == DESTROY_MODE_RETURN_VALUES)
  2168. +           {
  2169. +               return_values = kvs;
  2170. +           }
  2171. +           else
  2172. +           {
  2173. +               free(kvs);
  2174. +           }
  2175. +       }
  2176. +       else
  2177. +       {
  2178. +           return_values = destroy_long_map_values( &(map->lm), destruction_type, num_destroyed );
  2179. +       }
  2180. +       free(map);
  2181. +   }
  2182. +   return return_values;
  2183. +}
  2184. +
  2185. +
  2186. +
  2187. +
  2188. +/***************************************************
  2189. + * long_map function definitions
  2190. + ***************************************************/
  2191. +
  2192. +long_map* initialize_long_map(void)
  2193. +{
  2194. +   long_map* map = (long_map*)malloc(sizeof(long_map));
  2195. +   if(map != NULL) /* test for malloc failure */
  2196. +   {
  2197. +       map->root = NULL;
  2198. +       map->num_elements = 0;
  2199. +   }
  2200. +   return map;
  2201. +}
  2202. +
  2203. +void* get_long_map_element(long_map* map, unsigned long key)
  2204. +{
  2205. +   void* value = NULL;
  2206. +
  2207. +   if(map->root != NULL)
  2208. +   {
  2209. +       long_map_node* parent_node = map->root;
  2210. +       long_map_node* next_node;  
  2211. +       while( key != parent_node->key && (next_node = (long_map_node *)(key < parent_node->key ? parent_node->left : parent_node->right))  != NULL)
  2212. +       {
  2213. +           parent_node = next_node;
  2214. +       }
  2215. +       if(parent_node->key == key)
  2216. +       {
  2217. +           value = parent_node->value;
  2218. +       }
  2219. +   }
  2220. +   return value;
  2221. +}
  2222. +
  2223. +void* get_smallest_long_map_element(long_map* map, unsigned long* smallest_key)
  2224. +{
  2225. +   void* value = NULL;
  2226. +   if(map->root != NULL)
  2227. +   {
  2228. +       long_map_node* next_node = map->root;  
  2229. +       while( next_node->left != NULL)
  2230. +       {
  2231. +           next_node = next_node->left;
  2232. +       }
  2233. +       value = next_node->value;
  2234. +       *smallest_key = next_node->key;
  2235. +   }
  2236. +   return value;
  2237. +}
  2238. +
  2239. +void* get_largest_long_map_element(long_map* map, unsigned long* largest_key)
  2240. +{
  2241. +   void* value = NULL;
  2242. +   if(map->root != NULL)
  2243. +   {
  2244. +       long_map_node* next_node = map->root;  
  2245. +       while( next_node->right != NULL)
  2246. +       {
  2247. +           next_node = next_node->right;
  2248. +       }
  2249. +       value = next_node->value;
  2250. +       *largest_key = next_node->key;
  2251. +   }
  2252. +   return value;
  2253. +}
  2254. +
  2255. +void* remove_smallest_long_map_element(long_map* map, unsigned long* smallest_key)
  2256. +{
  2257. +   get_smallest_long_map_element(map, smallest_key);
  2258. +   return remove_long_map_element(map, *smallest_key);
  2259. +}
  2260. +
  2261. +void* remove_largest_long_map_element(long_map* map, unsigned long* largest_key)
  2262. +{
  2263. +   get_largest_long_map_element(map, largest_key);
  2264. +   return remove_long_map_element(map, *largest_key);
  2265. +}
  2266. +
  2267. +
  2268. +/* if replacement performed, returns replaced value, otherwise null */
  2269. +void* set_long_map_element(long_map* map, unsigned long key, void* value)
  2270. +{
  2271. +   stack_node* parent_list = NULL;
  2272. +   void* old_value = NULL;
  2273. +   int old_value_found = 0;
  2274. +
  2275. +   long_map_node* parent_node;
  2276. +   long_map_node* next_node;
  2277. +   stack_node* next_parent;
  2278. +   stack_node* previous_parent;
  2279. +   signed char new_balance;
  2280. +
  2281. +
  2282. +   long_map_node* new_node = (long_map_node*)malloc(sizeof(long_map_node));
  2283. +   if(new_node == NULL)
  2284. +   {
  2285. +       return NULL;
  2286. +   }
  2287. +   new_node->value = value;
  2288. +   new_node->key = key;
  2289. +   new_node->left = NULL;
  2290. +   new_node->right = NULL;
  2291. +   new_node->balance = 0;
  2292. +
  2293. +  
  2294. +
  2295. +   if(map->root == NULL)
  2296. +   {
  2297. +       map->root = new_node;  
  2298. +   }
  2299. +   else
  2300. +   {
  2301. +       parent_node = map->root;
  2302. +          
  2303. +       next_parent = (stack_node*)malloc(sizeof(stack_node));
  2304. +       if(next_parent == NULL) /* deal with malloc failure */
  2305. +       {
  2306. +           free(new_node);
  2307. +           return NULL; /* won't insert but won't seg fault */
  2308. +       }
  2309. +       next_parent->node_ptr =  &(map->root);
  2310. +       next_parent->previous = parent_list;
  2311. +       parent_list = next_parent; 
  2312. +          
  2313. +       while( key != parent_node->key && (next_node = (key < parent_node->key ? parent_node->left : parent_node->right) )  != NULL)
  2314. +       {
  2315. +           next_parent = (stack_node*)malloc(sizeof(stack_node));
  2316. +           if(next_parent == NULL) /* deal with malloc failure */
  2317. +           {
  2318. +               /* free previous stack nodes to prevent memory leak */
  2319. +               free_stack(parent_list);
  2320. +               free(new_node);
  2321. +               return NULL;
  2322. +           }
  2323. +           next_parent->node_ptr = key < parent_node->key ? &(parent_node->left) : &(parent_node->right);
  2324. +           next_parent->previous = parent_list;
  2325. +           next_parent->previous->direction = key < parent_node->key ? -1 : 1;
  2326. +           parent_list = next_parent;
  2327. +
  2328. +           parent_node = next_node;
  2329. +       }
  2330. +      
  2331. +      
  2332. +       if(key == parent_node->key)
  2333. +       {
  2334. +           old_value = parent_node->value;
  2335. +           old_value_found = 1;
  2336. +           parent_node->value = value;
  2337. +           free(new_node);
  2338. +           /* we merely replaced a node, no need to rebalance */
  2339. +       }
  2340. +       else
  2341. +       {  
  2342. +           if(key < parent_node->key)
  2343. +           {
  2344. +               parent_node->left = (void*)new_node;
  2345. +               parent_list->direction = -1;
  2346. +           }
  2347. +           else
  2348. +           {
  2349. +               parent_node->right = (void*)new_node;
  2350. +               parent_list->direction = 1;
  2351. +           }
  2352. +          
  2353. +          
  2354. +           /* we inserted a node, rebalance */
  2355. +           previous_parent = parent_list;
  2356. +           new_balance  = 1; /* initial value is not used, but must not be 0 for initial loop condition */
  2357. +          
  2358. +          
  2359. +           while(previous_parent != NULL && new_balance != 0)
  2360. +           {
  2361. +               new_balance = rebalance(previous_parent->node_ptr, previous_parent->direction, 1);
  2362. +               previous_parent = previous_parent->previous;
  2363. +           }
  2364. +       }
  2365. +   }
  2366. +
  2367. +   free_stack(parent_list);
  2368. +
  2369. +   if(old_value_found == 0)
  2370. +   {
  2371. +       map->num_elements = map->num_elements + 1;
  2372. +   }
  2373. +
  2374. +   return old_value;
  2375. +}
  2376. +
  2377. +
  2378. +void* remove_long_map_element(long_map* map, unsigned long key)
  2379. +{
  2380. +
  2381. +   void* value = NULL;
  2382. +  
  2383. +   long_map_node* root_node = map->root;  
  2384. +   stack_node* parent_list = NULL;
  2385. +
  2386. +
  2387. +   long_map_node* remove_parent;
  2388. +   long_map_node* remove_node;
  2389. +   long_map_node* next_node;
  2390. +
  2391. +   long_map_node* replacement;
  2392. +   long_map_node* replacement_parent;
  2393. +   long_map_node* replacement_next;
  2394. +
  2395. +   stack_node* next_parent;
  2396. +   stack_node* previous_parent;
  2397. +   stack_node* replacement_stack_node;
  2398. +
  2399. +
  2400. +   signed char new_balance;
  2401. +
  2402. +
  2403. +
  2404. +   if(root_node != NULL)
  2405. +   {
  2406. +       remove_parent = root_node;
  2407. +       remove_node = key < remove_parent->key ? remove_parent->left : remove_parent->right;
  2408. +      
  2409. +       if(remove_node != NULL && key != remove_parent->key)
  2410. +       {
  2411. +           next_parent = (stack_node*)malloc(sizeof(stack_node));
  2412. +           if(next_parent == NULL) /* deal with malloc failure */
  2413. +           {
  2414. +               return NULL;
  2415. +           }
  2416. +           next_parent->node_ptr =  &(map->root);
  2417. +           next_parent->previous = parent_list;
  2418. +           parent_list = next_parent; 
  2419. +           while( key != remove_node->key && (next_node = (key < remove_node->key ? remove_node->left : remove_node->right))  != NULL)
  2420. +           {
  2421. +               next_parent = (stack_node*)malloc(sizeof(stack_node));
  2422. +               if(next_parent == NULL) /* deal with malloc failure */
  2423. +               {
  2424. +                   /* free previous stack nodes to prevent memory leak */
  2425. +                   free_stack(parent_list);
  2426. +                   return NULL;
  2427. +               }
  2428. +               next_parent->node_ptr = key < remove_parent->key ? &(remove_parent->left) : &(remove_parent->right);
  2429. +               next_parent->previous = parent_list;
  2430. +               next_parent->previous->direction = key < remove_parent->key ? -1 : 1;
  2431. +               parent_list = next_parent;
  2432. +              
  2433. +              
  2434. +               remove_parent = remove_node;
  2435. +               remove_node = next_node;
  2436. +           }
  2437. +           parent_list->direction = key < remove_parent-> key ? -1 : 1;
  2438. +       }
  2439. +       else
  2440. +       {
  2441. +           remove_node = remove_parent;
  2442. +       }
  2443. +
  2444. +
  2445. +       if(key == remove_node->key)
  2446. +       {
  2447. +          
  2448. +           /* find replacement for node we are deleting */
  2449. +           if( remove_node->right == NULL )
  2450. +           {
  2451. +               replacement = remove_node->left;
  2452. +           }
  2453. +           else if( remove_node->right->left == NULL)
  2454. +           {
  2455. +
  2456. +               replacement = remove_node->right;
  2457. +               replacement->left = remove_node->left;
  2458. +               replacement->balance = remove_node->balance;
  2459. +
  2460. +               /* put pointer to replacement node into list for balance update */
  2461. +               replacement_stack_node = (stack_node*)malloc(sizeof(stack_node));
  2462. +               if(replacement_stack_node == NULL) /* deal with malloc failure */
  2463. +               {
  2464. +                   /* free previous stack nodes to prevent memory leak */
  2465. +                   free_stack(parent_list);
  2466. +                   return NULL;
  2467. +               }
  2468. +               replacement_stack_node->previous = parent_list;
  2469. +               replacement_stack_node->direction = 1; /* replacement is from right */
  2470. +               if(remove_node == remove_parent) /* special case for root node */
  2471. +               {
  2472. +                   replacement_stack_node->node_ptr = &(map->root);
  2473. +               }
  2474. +               else
  2475. +               {
  2476. +                   replacement_stack_node->node_ptr = key < remove_parent-> key ? &(remove_parent->left) : &(remove_parent->right);
  2477. +               }
  2478. +               parent_list = replacement_stack_node;
  2479. +
  2480. +           }
  2481. +           else
  2482. +           {
  2483. +               /* put pointer to replacement node into list for balance update */
  2484. +               replacement_stack_node = (stack_node*)malloc(sizeof(stack_node));
  2485. +               if(replacement_stack_node == NULL) /* deal with malloc failure */
  2486. +               {
  2487. +                   /* free previous stack nodes to prevent memory leak */
  2488. +                   free_stack(parent_list);
  2489. +                   return NULL;
  2490. +               }
  2491. +
  2492. +               replacement_stack_node->previous = parent_list;
  2493. +               replacement_stack_node->direction = 1; /* we always look for replacement on right */
  2494. +               if(remove_node == remove_parent) /* special case for root node */
  2495. +               {
  2496. +                   replacement_stack_node->node_ptr = &(map->root);
  2497. +               }
  2498. +               else
  2499. +               {
  2500. +                   replacement_stack_node->node_ptr = key < remove_parent-> key ? &(remove_parent->left) : &(remove_parent->right);
  2501. +               }
  2502. +
  2503. +               parent_list = replacement_stack_node;
  2504. +              
  2505. +
  2506. +               /*
  2507. +                * put pointer to replacement node->right into list for balance update
  2508. +                * this node will have to be updated with the proper pointer
  2509. +                * after we have identified the replacement
  2510. +                */
  2511. +               replacement_stack_node = (stack_node*)malloc(sizeof(stack_node));
  2512. +               if(replacement_stack_node == NULL) /* deal with malloc failure */
  2513. +               {
  2514. +                   /* free previous stack nodes to prevent memory leak */
  2515. +                   free_stack(parent_list);
  2516. +                   return NULL;
  2517. +               }
  2518. +
  2519. +               replacement_stack_node->previous = parent_list;
  2520. +               replacement_stack_node->direction = -1; /* we always look for replacement to left of this node */
  2521. +               parent_list = replacement_stack_node;
  2522. +              
  2523. +               /* find smallest node on right (large) side of tree */
  2524. +               replacement_parent = remove_node->right;
  2525. +               replacement = replacement_parent->left;
  2526. +              
  2527. +               while((replacement_next = replacement->left)  != NULL)
  2528. +               {
  2529. +                   next_parent = (stack_node*)malloc(sizeof(stack_node));
  2530. +                   if(next_parent == NULL) /* deal with malloc failure */
  2531. +                   {
  2532. +                       /* free previous stack nodes to prevent memory leak */
  2533. +                       free_stack(parent_list);
  2534. +                       return NULL;
  2535. +                   }
  2536. +
  2537. +                   next_parent->node_ptr = &(replacement_parent->left);
  2538. +                   next_parent->previous = parent_list;
  2539. +                   next_parent->direction = -1; /* we always go left */
  2540. +                   parent_list = next_parent;
  2541. +
  2542. +                   replacement_parent = replacement;
  2543. +                   replacement = replacement_next;
  2544. +
  2545. +               }
  2546. +
  2547. +               replacement_parent->left = replacement->right;
  2548. +              
  2549. +               replacement->left = remove_node->left;
  2550. +               replacement->right = remove_node->right;
  2551. +               replacement->balance = remove_node->balance;
  2552. +               replacement_stack_node->node_ptr = &(replacement->right);
  2553. +           }
  2554. +          
  2555. +           /* insert replacement at proper location in tree */
  2556. +           if(remove_node == remove_parent)
  2557. +           {
  2558. +               map->root = replacement;
  2559. +           }
  2560. +           else
  2561. +           {
  2562. +               remove_parent->left = remove_node == remove_parent->left ? replacement : remove_parent->left;
  2563. +               remove_parent->right = remove_node == remove_parent->right ? replacement : remove_parent->right;
  2564. +           }
  2565. +      
  2566. +
  2567. +           /* rebalance tree */
  2568. +           previous_parent = parent_list;
  2569. +           new_balance = 0;
  2570. +           while(previous_parent != NULL && new_balance == 0)
  2571. +           {
  2572. +               new_balance = rebalance(previous_parent->node_ptr, previous_parent->direction, -1);
  2573. +               previous_parent = previous_parent->previous;
  2574. +           }
  2575. +          
  2576. +          
  2577. +
  2578. +
  2579. +           /*
  2580. +            * since we found a value to remove, decrease number of elements in map
  2581. +            *  set return value to the deleted node's value and free the node
  2582. +            */
  2583. +           map->num_elements = map->num_elements - 1;
  2584. +           value = remove_node->value;
  2585. +           free(remove_node);
  2586. +       }
  2587. +   }
  2588. +
  2589. +   free_stack(parent_list);
  2590. +  
  2591. +   return value;
  2592. +}
  2593. +
  2594. +
  2595. +/* note: returned keys are dynamically allocated, you need to free them! */
  2596. +unsigned long* get_sorted_long_map_keys(long_map* map, unsigned long* num_keys_returned)
  2597. +{
  2598. +   unsigned long* key_list = (unsigned long*)malloc((map->num_elements)*sizeof(unsigned long));
  2599. +   unsigned long next_key_index;
  2600. +   if(key_list == NULL)
  2601. +   {
  2602. +       *num_keys_returned = 0;
  2603. +       return NULL;
  2604. +   }
  2605. +   next_key_index = 0;
  2606. +   get_sorted_node_keys(map->root, key_list, &next_key_index, 0);
  2607. +  
  2608. +   *num_keys_returned = map->num_elements;
  2609. +
  2610. +   return key_list;
  2611. +}
  2612. +
  2613. +
  2614. +void** get_sorted_long_map_values(long_map* map, unsigned long* num_values_returned)
  2615. +{
  2616. +   void** value_list = (void**)malloc((map->num_elements+1)*sizeof(void*));
  2617. +   unsigned long next_value_index;
  2618. +
  2619. +   if(value_list == NULL)
  2620. +   {
  2621. +       *num_values_returned = 0;
  2622. +       return NULL;
  2623. +   }
  2624. +   next_value_index = 0;
  2625. +   get_sorted_node_values(map->root, value_list, &next_value_index, 0);
  2626. +   value_list[map->num_elements] = NULL; /* since we're dealing with pointers make list null terminated */
  2627. +
  2628. +   *num_values_returned = map->num_elements;
  2629. +   return value_list;
  2630. +
  2631. +}
  2632. +
  2633. +
  2634. +
  2635. +void** destroy_long_map(long_map* map, int destruction_type, unsigned long* num_destroyed)
  2636. +{
  2637. +   void** return_values = destroy_long_map_values(map, destruction_type, num_destroyed);
  2638. +   free(map);
  2639. +   return return_values;
  2640. +}
  2641. +
  2642. +
  2643. +
  2644. +void apply_to_every_long_map_value(long_map* map, void (*apply_func)(unsigned long key, void* value))
  2645. +{
  2646. +   apply_to_every_long_map_node(map->root, apply_func);
  2647. +}
  2648. +void apply_to_every_string_map_value(string_map* map, void (*apply_func)(char* key, void* value))
  2649. +{
  2650. +   apply_to_every_string_map_node( (map->lm).root, map->store_keys, apply_func);
  2651. +}
  2652. +
  2653. +
  2654. +/***************************************************
  2655. + * internal utility function definitions
  2656. + ***************************************************/
  2657. +static void free_stack(stack_node* stack)
  2658. +{
  2659. +   while(stack != NULL)
  2660. +   {
  2661. +       stack_node* prev_node = stack;
  2662. +       stack = prev_node->previous;
  2663. +       free(prev_node);
  2664. +   }
  2665. +
  2666. +}
  2667. +
  2668. +static void** destroy_long_map_values(long_map* map, int destruction_type, unsigned long* num_destroyed)
  2669. +{
  2670. +   void** return_values = NULL;
  2671. +   unsigned long return_index = 0;
  2672. +
  2673. +   *num_destroyed = 0;
  2674. +
  2675. +   if(destruction_type == DESTROY_MODE_RETURN_VALUES)
  2676. +   {
  2677. +       return_values = (void**)malloc((map->num_elements+1)*sizeof(void*));
  2678. +       if(return_values == NULL) /* deal with malloc failure */
  2679. +       {
  2680. +           destruction_type = DESTROY_MODE_IGNORE_VALUES; /* could cause memory leak, but there's no other way to be sure we won't seg fault */
  2681. +       }
  2682. +       else
  2683. +       {
  2684. +           return_values[map->num_elements] = NULL;
  2685. +       }
  2686. +   }
  2687. +   while(map->num_elements > 0)
  2688. +   {
  2689. +       unsigned long smallest_key;
  2690. +       void* removed_value = remove_smallest_long_map_element(map, &smallest_key);
  2691. +       if(destruction_type == DESTROY_MODE_RETURN_VALUES)
  2692. +       {
  2693. +           return_values[return_index] = removed_value;
  2694. +       }
  2695. +       if(destruction_type == DESTROY_MODE_FREE_VALUES)
  2696. +       {
  2697. +           free(removed_value);
  2698. +       }
  2699. +       return_index++;
  2700. +       *num_destroyed = *num_destroyed + 1;
  2701. +   }
  2702. +   return return_values;
  2703. +}
  2704. +
  2705. +static void apply_to_every_long_map_node(long_map_node* node, void (*apply_func)(unsigned long key, void* value))
  2706. +{
  2707. +   if(node != NULL)
  2708. +   {
  2709. +       apply_to_every_long_map_node(node->left,  apply_func);
  2710. +      
  2711. +       apply_func(node->key, node->value);
  2712. +
  2713. +       apply_to_every_long_map_node(node->right, apply_func);
  2714. +   }
  2715. +}
  2716. +static void apply_to_every_string_map_node(long_map_node* node, unsigned char has_key, void (*apply_func)(char* key, void* value))
  2717. +{
  2718. +   if(node != NULL)
  2719. +   {
  2720. +       apply_to_every_string_map_node(node->left, has_key,  apply_func);
  2721. +      
  2722. +       if(has_key)
  2723. +       {
  2724. +           string_map_key_value* kv = (string_map_key_value*)(node->value);
  2725. +           apply_func(kv->key, kv->value);
  2726. +       }
  2727. +       else
  2728. +       {
  2729. +           apply_func(NULL, node->value);
  2730. +       }
  2731. +       apply_to_every_string_map_node(node->right, has_key, apply_func);
  2732. +   }
  2733. +}
  2734. +
  2735. +
  2736. +
  2737. +static void get_sorted_node_keys(long_map_node* node, unsigned long* key_list, unsigned long* next_key_index, int depth)
  2738. +{
  2739. +   if(node != NULL)
  2740. +   {
  2741. +       get_sorted_node_keys(node->left, key_list, next_key_index, depth+1);
  2742. +      
  2743. +       key_list[ *next_key_index ] = node->key;
  2744. +       (*next_key_index)++;
  2745. +
  2746. +       get_sorted_node_keys(node->right, key_list, next_key_index, depth+1);
  2747. +   }
  2748. +}
  2749. +
  2750. +static void get_sorted_node_values(long_map_node* node, void** value_list, unsigned long* next_value_index, int depth)
  2751. +{
  2752. +   if(node != NULL)
  2753. +   {
  2754. +       get_sorted_node_values(node->left, value_list, next_value_index, depth+1);
  2755. +      
  2756. +       value_list[ *next_value_index ] = node->value;
  2757. +       (*next_value_index)++;
  2758. +
  2759. +       get_sorted_node_values(node->right, value_list, next_value_index, depth+1);
  2760. +   }
  2761. +}
  2762. +
  2763. +
  2764. +
  2765. +/*
  2766. + * direction = -1 indicates left subtree updated, direction = 1 for right subtree
  2767. + * update_op = -1 indicates delete node, update_op = 1 for insert node
  2768. + */
  2769. +static signed char rebalance (long_map_node** n, signed char direction, signed char update_op)
  2770. +{
  2771. +   /*
  2772. +   printf( "original: key = %ld, balance = %d, update_op=%d, direction=%d\n", (*n)->key, (*n)->balance, update_op, direction);
  2773. +   */
  2774. +
  2775. +   (*n)->balance = (*n)->balance + (update_op*direction);
  2776. +  
  2777. +   if( (*n)->balance <  -1)
  2778. +   {
  2779. +       if((*n)->left->balance < 0)
  2780. +       {
  2781. +           rotate_right(n);
  2782. +           (*n)->right->balance = 0;
  2783. +           (*n)->balance = 0;
  2784. +       }
  2785. +       else if((*n)->left->balance == 0)
  2786. +       {
  2787. +           rotate_right(n);
  2788. +           (*n)->right->balance = -1;
  2789. +           (*n)->balance = 1;
  2790. +       }
  2791. +       else if((*n)->left->balance > 0)
  2792. +       {
  2793. +           rotate_left( &((*n)->left) );
  2794. +           rotate_right(n);
  2795. +           /*
  2796. +           if( (*n)->balance < 0 )
  2797. +           {
  2798. +               (*n)->left->balance = 0;
  2799. +               (*n)->right->balance = 1;
  2800. +           }
  2801. +           else if( (*n)->balance == 0 )
  2802. +           {
  2803. +               (*n)->left->balance = 0;
  2804. +               (*n)->right->balance = 0;
  2805. +           }
  2806. +           else if( (*n)->balance > 0 )
  2807. +           {
  2808. +               (*n)->left->balance = -1;
  2809. +               (*n)->right->balance = 0;
  2810. +           }
  2811. +           */
  2812. +           (*n)->left->balance  = (*n)->balance > 0 ? -1 : 0;
  2813. +           (*n)->right->balance = (*n)->balance < 0 ?  1 : 0;
  2814. +           (*n)->balance = 0;
  2815. +       }
  2816. +   }
  2817. +   if( (*n)->balance >  1)
  2818. +   {
  2819. +       if((*n)->right->balance > 0)
  2820. +       {
  2821. +           rotate_left(n);
  2822. +           (*n)->left->balance = 0;
  2823. +           (*n)->balance = 0;
  2824. +       }
  2825. +       else if ((*n)->right->balance == 0)
  2826. +       {
  2827. +           rotate_left(n);
  2828. +           (*n)->left->balance = 1;
  2829. +           (*n)->balance = -1;
  2830. +       }
  2831. +       else if((*n)->right->balance < 0)
  2832. +       {
  2833. +           rotate_right( &((*n)->right) );
  2834. +           rotate_left(n);
  2835. +           /*
  2836. +           if( (*n)->balance < 0 )
  2837. +           {
  2838. +               (*n)->left->balance = 0;
  2839. +               (*n)->right->balance = 1;
  2840. +           }
  2841. +           else if( (*n)->balance == 0 )
  2842. +           {
  2843. +               (*n)->left->balance = 0;
  2844. +               (*n)->right->balance = 0;
  2845. +           }
  2846. +           else if( (*n)->balance > 0 )
  2847. +           {
  2848. +               (*n)->left->balance = -1;
  2849. +               (*n)->right->balance = 0;
  2850. +           }
  2851. +           */
  2852. +           (*n)->left->balance   = (*n)->balance > 0 ? -1 : 0;
  2853. +           (*n)->right->balance  = (*n)->balance < 0 ?  1 : 0;
  2854. +           (*n)->balance = 0;
  2855. +       }
  2856. +   }
  2857. +
  2858. +   /*
  2859. +   printf( "key = %ld, balance = %d\n", (*n)->key, (*n)->balance);
  2860. +   */
  2861. +
  2862. +   return (*n)->balance;
  2863. +}
  2864. +
  2865. +
  2866. +static void rotate_right (long_map_node** parent)
  2867. +{
  2868. +   long_map_node* old_parent = *parent;
  2869. +   long_map_node* pivot = old_parent->left;
  2870. +   old_parent->left = pivot->right;
  2871. +   pivot->right  = old_parent;
  2872. +  
  2873. +   *parent = pivot;
  2874. +}
  2875. +
  2876. +static void rotate_left (long_map_node** parent)
  2877. +{
  2878. +   long_map_node* old_parent = *parent;
  2879. +   long_map_node* pivot = old_parent->right;
  2880. +   old_parent->right = pivot->left;
  2881. +   pivot->left  = old_parent;
  2882. +  
  2883. +   *parent = pivot;
  2884. +}
  2885. +
  2886. +
  2887. +
  2888. +/***************************************************************************
  2889. + * This algorithm was created for the sdbm database library (a public-domain
  2890. + * reimplementation of ndbm) and seems to work relatively well in
  2891. + * scrambling bits
  2892. + *
  2893. + *
  2894. + * This code was derived from code found at:
  2895. + * http://www.cse.yorku.ca/~oz/hash.html
  2896. + ***************************************************************************/
  2897. +static unsigned long sdbm_string_hash(const char *key)
  2898. +{
  2899. +   unsigned long hashed_key = 0;
  2900. +
  2901. +   int index = 0;
  2902. +   unsigned int nextch;
  2903. +   while(key[index] != '\0')
  2904. +   {
  2905. +       nextch = key[index];
  2906. +       hashed_key = nextch + (hashed_key << 6) + (hashed_key << 16) - hashed_key;
  2907. +       index++;
  2908. +   }
  2909. +   return hashed_key;
  2910. +}
  2911. +
  2912. +
  2913. --- a/net/ipv4/netfilter/Kconfig.orig   2014-12-08 01:21:05.000000000 +0300
  2914. +++ b/net/ipv4/netfilter/Kconfig    2015-01-27 09:40:50.961960594 +0300
  2915. @@ -190,6 +190,12 @@
  2916.       To compile it as a module, choose M here.  If unsure, say N.
  2917.       The module will be called ipt_rpfilter.
  2918.  
  2919. +config IP_NF_MATCH_WEBURL
  2920. +   tristate '"weburl" weburl'
  2921. +   depends on NETFILTER_ADVANCED
  2922. +   ---help---
  2923. +     weburl
  2924. +
  2925.  config IP_NF_MATCH_TTL
  2926.     tristate '"ttl" match support'
  2927.     depends on NETFILTER_ADVANCED
  2928. --- a/net/ipv4/netfilter/Makefile.orig  2014-12-08 01:21:05.000000000 +0300
  2929. +++ b/net/ipv4/netfilter/Makefile   2015-01-27 09:41:33.930010380 +0300
  2930. @@ -55,6 +55,7 @@
  2931.  # matches
  2932.  obj-$(CONFIG_IP_NF_MATCH_AH) += ipt_ah.o
  2933.  obj-$(CONFIG_IP_NF_MATCH_RPFILTER) += ipt_rpfilter.o
  2934. +obj-$(CONFIG_IP_NF_MATCH_WEBURL) += ipt_weburl.o
  2935.  
  2936.  # targets
  2937.  obj-$(CONFIG_IP_NF_TARGET_CLUSTERIP) += ipt_CLUSTERIP.o
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