1    | /***************************************
2    |   $Revision: 1.11 $
3    | 
4    |   Radix payload (rp) - user level functions for storing data in radix trees
5    | 
6    |   rp_search = search the loaded radix trees using an ascii key
7    | 
8    |               Motto: "And all that for inetnums..."
9    | 
10   |   Status: NOT REVIEWED, TESTED
11   |   
12   |   Design and implementation by: Marek Bukowy
13   |   
14   |   ******************/ /******************
15   |   Copyright (c) 1999                              RIPE NCC
16   |  
17   |   All Rights Reserved
18   |   
19   |   Permission to use, copy, modify, and distribute this software and its
20   |   documentation for any purpose and without fee is hereby granted,
21   |   provided that the above copyright notice appear in all copies and that
22   |   both that copyright notice and this permission notice appear in
23   |   supporting documentation, and that the name of the author not be
24   |   used in advertising or publicity pertaining to distribution of the
25   |   software without specific, written prior permission.
26   |   
27   |   THE AUTHOR DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, INCLUDING
28   |   ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS; IN NO EVENT SHALL
29   |   AUTHOR BE LIABLE FOR ANY SPECIAL, INDIRECT OR CONSEQUENTIAL DAMAGES OR ANY
30   |   DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN
31   |   AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
32   |   OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
33   |   ***************************************/
34   | 
35   | 
36   | #include <rp.h>
37   | 
38   | static
39   | void
40   | rp_exclude_datlink(GList    **datlist, GList    *element)
41   | {
42   |   /* remove element from list(becomes a self-consistent list) */
43   |   *datlist = g_list_remove_link(*datlist, element);
44   |   
45   |   /* free it and the payload */
46   |   wr_clear_list( &element );
47   | }
48   | 
49   | 
50   | /**************************************************************************/
51   | /*+++++++++++
52   |    helper: 
53   |    this routine goes through the list of prefixes and performs a bin_search
54   |    on each of them; attaches the results to datlist.
55   | +++++++++++*/
56   | static
57   | er_ret_t
58   | rp_preflist_search (
59   |                     rx_srch_mt search_mode, 
60   |                     int par_a,
61   |                     int par_b,
62   |                     rx_tree_t  *mytree,
63   |                     GList    **preflist,
64   |                     GList    **datlist
65   |                     )
66   | 
67   | { 
68   |   char   prefstr[IP_PREFSTR_MAX];
69   |   GList   *qitem;
70   |   ip_prefix_t *querypref;
71   |   er_ret_t err;
72   |   
73   |   for( qitem = g_list_first(*preflist);
74   |        qitem != NULL;
75   |        qitem = g_list_next(qitem)) {
76   |     
77   |     querypref = qitem->data;
78   |     
79   |     if( IP_pref_b2a( querypref, prefstr, IP_PREFSTR_MAX) != IP_OK ) {
80   |       die;
81   |     }
82   |     ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
83   |               "rx_preflist_search: mode %d (%s) (par %d) for %s", 
84   |               search_mode, RX_text_srch_mode(search_mode), par_a, prefstr);
85   |     
86   |     if (mytree->num_nodes > 0) {
87   |       err = RX_bin_search( search_mode, par_a, par_b, mytree, querypref, 
88   |                    datlist, RX_ANS_ALL);
89   |       if( err != RX_OK ) {
90   |         return err;
91   |       }
92   |     }
93   |   }
94   |   
95   |   return RX_OK;
96   | }
97   | 
98   | /*++++
99   |   this is a helper: goes through a datlist and returns the smallest
100  |   size of a range
101  | 
102  |   works for IPv4 only
103  |   +++*/
104  | static
105  | ip_rangesize_t
106  | rp_find_smallest_span( GList *datlist ) {
107  |   ip_rangesize_t  min_span, span;
108  |   GList *ditem;
109  | 
110  |   min_span = 0xffffffff; /* IPv4 only!!!!*/
111  | 
112  |     /* go through the list and find the shortest range.    */
113  |     for(ditem = g_list_first(datlist);
114  |         ditem != NULL;
115  |         ditem = g_list_next(ditem)) {
116  |       rx_datref_t *refptr = (rx_datref_t *) (ditem->data);
117  |       
118  |       span = IP_rang_span( & refptr->leafptr->iprange);
119  |       
120  |       if( span < min_span ) {
121  |         min_span = span;
122  |       }
123  |     }
124  |     ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
125  |               "rp_find_smallest_span: minimal span is %d", min_span);
126  | 
127  |     return min_span;
128  | }
129  | 
130  | 
131  | 
132  | /* helper for the inetnum/exless search - for this one a hash of pairs
133  | (leafptr,occurences) must be maintained.
134  | 
135  | This routine increments the counter for a leafptr, creating a new
136  | pair if this leafptr was not referenced before.
137  | 
138  | */
139  | static
140  | int rp_leaf_occ_inc(GHashTable *hash, rx_dataleaf_t *leafptr)
141  | {
142  |   /* one little trick: store the number of occurences 
143  |      as cast (void *) */
144  |   int val;
145  |   
146  |   val = (int) g_hash_table_lookup(hash, leafptr);
147  |   /* 0 if it's not known yet. anyway: put it in the hash (value==key) */
148  |   
149  |   g_hash_table_insert(hash, leafptr, (void *) ++val); 
150  |   
151  |   return val;
152  | }
153  | 
154  | /* exclude exact match - not to be merged with preselction :-( */
155  | static void
156  | rp_exclude_exact_match( GList **datlist, ip_range_t *testrang) 
157  | {
158  |   GList *ditem, *newitem;
159  |   
160  |   ditem = g_list_first(*datlist);
161  | 
162  |   while( ditem != NULL ) {
163  |     rx_datref_t *refptr = (rx_datref_t *) (ditem->data);
164  | 
165  |     newitem = g_list_next(ditem);
166  |     
167  |     if( memcmp( & refptr->leafptr->iprange, 
168  | 		testrang, sizeof(ip_range_t)) == 0 ) {  
169  |       rp_exclude_datlink(datlist, ditem);
170  |       ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
171  | 		"process_datlist: discarded an exact match");
172  |     }
173  |     ditem = newitem;
174  |   } /* while */
175  | }
176  | 
177  | static int
178  | rp_find_longest_prefix(GList **datlist)
179  | {
180  |   GList *ditem;
181  |   int max_pref=0;
182  | 
183  |   for(ditem = g_list_first(*datlist);
184  |       ditem != NULL;
185  |       ditem = g_list_next(ditem)) {
186  |     rx_datref_t *refptr = (rx_datref_t *) (ditem->data);
187  |     
188  |     if( refptr->leafptr->preflen > max_pref ) {
189  |       max_pref = refptr->leafptr->preflen;
190  |     }
191  |   }
192  |   
193  |   return max_pref;
194  | }
195  | 
196  | 
197  | /*+ rp_asc_process_datlist() - helper for RP_asc_search()
198  |   
199  |   fetches the copies of objects from the radix tree into datlist
200  | 
201  |      ASSUMES LOCKED TREE
202  | 
203  |      the behaviour for a default inetnum (range) query is: 
204  |        do an exact match; 
205  |        if it fails, do an exless match on the encompassing prefix
206  |      for routes(prefixes):
207  |        do an exless match
208  |      
209  |      So if it's the default search mode on an inetnum tree,
210  |      and the key is a range, 
211  |      then an exact search is performed on one of the composing prefixes.
212  | 
213  |      Then the resulting data leaves are checked for exact matching with 
214  |      the range queried for.
215  |      Any dataleaves that do not match are discarded, and if none are left,
216  |      the procedure falls back to searching for the encompassing prefix.
217  |      (calculated in the smart_conv routine). 
218  |      Add the dataleaf copies to the list of answers, 
219  |      taking span into account 
220  | +*/
221  | static
222  | er_ret_t
223  | rp_asc_process_datlist(
224  | 		       rx_srch_mt search_mode,
225  | 		       int        par_a,
226  | 		       rx_fam_t   fam_id,
227  | 		       int        prefnumber,
228  | 		       GList    **datlist,
229  | 		       ip_range_t *testrang,
230  | 		       int       *hits
231  | 		       )
232  | {
233  |   ip_rangesize_t  min_span=0, span;
234  |   int max_pref = -1;
235  |   GList    *ditem, *newitem;
236  |   GHashTable *lohash = g_hash_table_new(NULL, NULL);
237  |  
238  |   /* in MORE and LESS(1) search exact match must not be displayed */
239  |   if ( search_mode == RX_SRCH_MORE 
240  |        || ( search_mode == RX_SRCH_LESS && par_a == 1 ) ) {
241  |     rp_exclude_exact_match(datlist, testrang);
242  |   }
243  |   
244  |   /* Preselection moved to processing, only span calculation done here *
245  |    * 
246  |     
247  |    EXLESS and LESS(1) search: the smallest span must be found,
248  |    but if the less spec node is not the same for all composing prefixes,
249  |    it means it's not really this one.
250  |    
251  |    we check that by the number of references to this node is less than
252  |    the number of composing prefixes
253  |    
254  |    We do the same for the less specific search - a node must be less 
255  |    specific to all prefixes.
256  |    
257  |    if the number of references is  not enough, then return no hits,
258  |    another try will be made, this time with one, encompassing prefix.
259  |   */
260  |   
261  |   if ( (search_mode == RX_SRCH_EXLESS )   
262  |        || ( search_mode == RX_SRCH_LESS && par_a == 1 ) )  {
263  |     /* span works only for IP_V4. We use it only for inetnums,
264  |        although RT/v4 would work too */
265  |     if( testrang->begin.space == IP_V4 &&
266  | 	fam_id == RX_FAM_IN ) {
267  |       min_span = rp_find_smallest_span(*datlist);
268  |     }
269  |     else {
270  |       /* in IPv6 and RT trees in general,  we can obtain the same
271  | 	 result by selecting the longest prefix */
272  |       max_pref = rp_find_longest_prefix(datlist);
273  |     }
274  |   }
275  |   
276  |   /* Process the dataleaf copies and add to the list of answers. */  
277  |   ditem = g_list_first(*datlist);
278  |   while(ditem != NULL) {
279  |     rx_datref_t *refptr = (rx_datref_t *) (ditem->data);
280  |     int exclude = 0;
281  |     
282  |     if(search_mode == RX_SRCH_EXLESS || search_mode == RX_SRCH_LESS ) {
283  |       
284  |       /* min_span defined <=> EXLESS or LESS(1) search of INETNUMS: 
285  | 	 the smallest span must be returned */
286  |       if( !exclude && min_span != 0 
287  | 	  && (span = IP_rang_span( &refptr->leafptr->iprange))!=min_span) {
288  | 	ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
289  | 		  "process_datlist: (EX)LESS: discarded object with span %d", span);
290  | 	exclude = 1;
291  |       }
292  |       /* max_pref defined <=> EXLESS search of INETNUMS or LESS(1) of RT:
293  |        */
294  |       if( !exclude && max_pref >= 0
295  | 	  && refptr->leafptr->preflen < max_pref ) {
296  | 	ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
297  | 		  "process_datlist: (EX)LESS: discarded object with preflen %d", 
298  | 		  refptr->leafptr->preflen);
299  | 	exclude = 1;
300  |       }
301  | 
302  |       /* number of occurences */
303  |       /* XXX this will go when the old algorithm goes */
304  |       if( !exclude 
305  | 	  && prefnumber > 1 ) { /* do not check if all will be approved */
306  | 	
307  | 	if( rp_leaf_occ_inc(lohash, refptr->leafptr) < prefnumber ) {
308  | 	  ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
309  | 		    "process_datlist: (EX)LESS: leafptr %x not enough",refptr->leafptr);
310  | 	  exclude = 1;
311  | 	} 
312  | 	else {
313  | 	  ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
314  | 		    "process_datlist: (EX)LESS: leafptr %x GOOD enough",refptr->leafptr);
315  | 	}
316  |       }
317  |     } 
318  |     else if( search_mode ==  RX_SRCH_EXACT ) {
319  |       /* EXACT search - discard if the range does not match */
320  |       if( memcmp( & refptr->leafptr->iprange, 
321  | 		  testrang, sizeof(ip_range_t)) != 0) {
322  | 	
323  | 	ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
324  | 		  "process_datlist: EXACT; discarded a mismatch");
325  | 	exclude = 1;
326  |       } /*  EXACT match */
327  |     } 
328  |     else if( search_mode ==  RX_SRCH_MORE ) {
329  |       /* MORE: exclude if not fully contained in the search term */
330  |       if( ! (IP_addr_in_rang(&refptr->leafptr->iprange.begin, testrang )
331  | 	  && IP_addr_in_rang(&refptr->leafptr->iprange.end, testrang ))) {
332  | 	ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
333  | 		  "process_datlist: MORE; discarded a not-fully contained one");
334  | 	exclude = 1;
335  |       }
336  |     }
337  |     
338  |     
339  |     /* get next item now, before the current gets deleted */
340  |     newitem = g_list_next(ditem);
341  |     if( exclude ) {
342  |       /* get rid of it */
343  |       rp_exclude_datlink(datlist, ditem);
344  |     } 
345  |     else {
346  |       /* OK, so we ACCEPT these results*/
347  |       /* uniqueness ensured in copy_results */
348  |       (*hits)++;
349  |     }
350  |     ditem = newitem;
351  |   } /* while ditem */ 
352  |   
353  |   /* wr_clear_list(&lolist); */
354  |   g_hash_table_destroy(lohash);
355  |   return RX_OK;
356  | }    
357  |   
358  | /* 
359  |    rp_mod_preflist() is a helper function for rp_asc_search().
360  | 
361  |    modifies the list of prefixes to search for, 
362  | 
363  |    special treatment for inetnum/exact:
364  |    + a range that is equivalent to the search key (which may be a prefix)
365  |      is made, to be used later for comparisons
366  |      
367  |    special treatment for inetnum/exless/composed:
368  |    + the first pass mode is set to exact (otherwise to search_mode)
369  | 
370  |    a few optimisations are made:
371  |    + for a route/composed_range/exact : the search is nuked
372  |    + for an inetnum/composed_range/(exless|exact) : the list is truncated
373  |      to one prefix, because in an exact search, it must be there anyway, 
374  |      and for the exless, the smallest encompassing one must match
375  |    
376  |      
377  |   */
378  |   
379  | static
380  | er_ret_t 
381  | rp_mod_preflist(
382  |                rx_srch_mt search_mode, 
383  |                char *key,  
384  | 	       ip_keytype_t key_type,
385  |                rx_fam_t   fam_id,  
386  |                GList **preflist,
387  | 	       ip_range_t *testrang,
388  | 	       rx_srch_mt *first_pass_mode
389  | 	       ) 
390  | {
391  |   int prefcount;
392  | 
393  |   prefcount = g_list_length(*preflist);
394  | 
395  |   /* EXACT search of a route tree for a composed range makes no sense */
396  |   if( fam_id == RX_FAM_RT && search_mode == RX_SRCH_EXACT 
397  |       && key_type == IPK_RANGE && prefcount > 1 ) {
398  |     /* abort search - i.e. clear the preflist*/
399  | 
400  |       wr_clear_list( preflist);
401  |       
402  |       ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
403  | 	"rp_mod_preflist: route/exact/composed - preflist cleared");
404  |   }
405  |   
406  |   /*+ inetnum / exact|exless specific :
407  |     optimise: (composed range) 
408  |     
409  |       perform a separate first pass, with just one exact search on one of 
410  |       the composing prefixes - the object must be found if it's in the 
411  |       database.
412  |       
413  |       So a little cheat: remove all but one prefixes from preflist
414  |       and force a different search mode
415  |       +*/ 
416  |   if( fam_id == RX_FAM_IN  
417  |       && (search_mode == RX_SRCH_EXLESS || search_mode == RX_SRCH_EXACT) 
418  |       && key_type == IPK_RANGE && prefcount > 1 ) { 
419  | 
420  |       ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
421  | 	 "rp_mod_preflist: inet/ex***/composed - first pass EXACT forced");
422  | 
423  |       *first_pass_mode = RX_SRCH_EXACT;
424  |   } /* inetnum / exact|exless specific */
425  | 
426  |   /* exact: set range so a comparison can be performed */
427  |   /* must succeed after smart_conv succeeded */
428  |   IP_smart_range(key, testrang, IP_EXPN, &key_type);
429  | 
430  |   return RX_OK;
431  | }
432  | /**************************************************************************/
433  | 
434  | /*+ appends the element pointed to by datref to finallist +*/
435  | static
436  | er_ret_t
437  | rp_asc_append_datref(rx_datref_t *refptr, GList **finallist)
438  | {
439  |   er_ret_t err;
440  |   rx_datcpy_t *datcpy;
441  |   void *dataptr;
442  | 
443  |     /* OK, so we ACCEPT this result. Copy it.*/
444  | 
445  |     if( (err=wr_calloc( (void **)& datcpy, 1, sizeof(rx_datcpy_t))) != UT_OK) {
446  |       return err; /*    die;*/
447  |     }
448  |     
449  |     datcpy->leafcpy = *(refptr->leafptr);
450  |     
451  |     /* copy the immediate data too. Set the ptr.*/
452  |     
453  |     if( (err=wr_calloc( (void **) & dataptr, 1, refptr->leafptr->data_len)) 
454  |         != UT_OK) {
455  |       return err; /*    die;*/
456  |     }
457  |     memcpy(dataptr, refptr->leafptr->data_ptr, refptr->leafptr->data_len);
458  |     
459  |     datcpy->leafcpy.data_ptr = dataptr;
460  | 
461  |     *finallist = g_list_prepend(*finallist, datcpy);
462  | 
463  |     /* XXX this wouldn't work in access_control */
464  |     ER_dbg_va(FAC_RP, ASP_RP_SRCH_DATA,
465  | 	      "rp_asc_append 'ed: %s", dataptr);
466  | 
467  |     return RX_OK;
468  | }
469  | 
470  | /*+ goes through datlist (list of references "datref") and add copies of 
471  | leaves referenced to the finallist 
472  | 
473  | maintains its own uniqhash which holds pointers to copied dataleaves.
474  | 
475  | modifies: finallist
476  | 
477  | returns: error from wr_malloc
478  | 
479  | +*/
480  | static
481  | er_ret_t
482  | rp_srch_copyresults(GList *datlist,
483  | 		    GList **finallist,
484  | 		    int maxcount)
485  | {
486  |   er_ret_t err;
487  |   GList    *ditem;
488  |   GHashTable *uniqhash = g_hash_table_new(NULL, NULL); /* defaults */
489  |   int count = 0;
490  | 
491  |   ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET, "srch_copyresults");
492  | 
493  |   /*  copy dataleaves pointed to by entries from the datlist
494  |       only once (check uniqueness in the hash table) */
495  |   for(ditem = g_list_first(datlist);
496  |       ditem != NULL;
497  |       ditem = g_list_next(ditem)) {
498  |     rx_datref_t   *refptr = (rx_datref_t *) (ditem->data);
499  |     rx_dataleaf_t *ansptr = refptr->leafptr;
500  | 
501  |     /* search for every ansptr (dataleaf pointer) in uniqhash */
502  |     if( g_hash_table_lookup(uniqhash, ansptr) == NULL ) {
503  |       
504  |       /* it's not known yet. OK: put it in the hash (value==key) */
505  |       g_hash_table_insert(uniqhash, ansptr, ansptr); 
506  |       
507  |       /* and copy the dataleaf */
508  |       if( !NOERR(err = rp_asc_append_datref(refptr, finallist)) ) {
509  | 	return err;
510  |       }
511  |     }
512  | 
513  |     /* check the limit on number of objects if defined ( >0)  */
514  |     count++;
515  |     if( maxcount > 0 && count > maxcount ) {
516  |       break;
517  |     }
518  | 
519  |   } /*  foreach (datlist) */
520  |     
521  |   g_hash_table_destroy(uniqhash); /* elements are still linked to through datlist */
522  | 
523  |   return RP_OK;
524  | }
525  | 
526  | static 
527  | void
528  | rp_begend_preselection(GList **datlist, rx_fam_t fam_id, ip_range_t *testrang) 
529  | {
530  |   GList *ditem, *newitem; 
531  | 
532  |   ditem = g_list_first(*datlist);
533  | 
534  |   while( ditem != NULL ) {
535  |     rx_datref_t *refptr = (rx_datref_t *) (ditem->data);
536  |     newitem = g_list_next(ditem);
537  | 
538  |     /* the test is indentical for route & inetnum trees */
539  |     if( IP_addr_in_rang(&testrang->end, &refptr->leafptr->iprange) == 0 ) {
540  |       
541  |       rp_exclude_datlink(datlist, ditem);
542  |       ER_dbg_va(FAC_RP, ASP_RP_SRCH_DET,
543  | 		"process_datlist: discarded an uncovering leafptr %x",
544  | 		refptr->leafptr);
545  | 
546  |     }
547  |     ditem = newitem;
548  |   } /* while */
549  | }
550  | 
551  | /*+++++++++++++++
552  |   search.
553  | 
554  |   2 approaches: 
555  | 
556  |   1. (most modes): look up all less specifics of beginning and end of range,
557  |   compare/select/etc.
558  | 
559  |   2. More spec mode: break up the query range into prefixes, [erform a search
560  |   for each of them. Add all results together.
561  | 
562  |   translates a query into a binary prefix (or prefixes, if range).
563  |   for registry+space (or if they are zero, for all
564  |   registries/spaces)
565  |   finds tree 
566  |   calls RX_bin_search (returning node copies).
567  |   will not put duplicate entries (composed inetnums).
568  |   returns some sort of error code :-) 
569  |   
570  |   Cuts the number of answers from RX_bin_search down to max_count,
571  |   but since some of the answers may have been "normalized" in the
572  |   underlying functions (multiple occurences removed), 
573  |   the result is _at_most_ max_count.
574  |   
575  |   appends to a given list of data blocks (not nodes!)
576  | 
577  |   The EXLESS search on inetnum tree should return the shortest range 
578  |   that was found, by means of comparing span (size) of the range.
579  |   If there are more of size equal to the smallest one, they are also
580  |   returned.
581  | 
582  |   returns RX_OK or a code from an underlying function
583  | ++++++++++++*/
584  | er_ret_t
585  | RP_asc_search ( 
586  |                rx_srch_mt search_mode, 
587  |                int par_a,
588  |                int par_b,
589  |                char *key,     /*+ search term: (string) prefix/range/IP +*/
590  |                rp_regid_t  reg_id,
591  | 	       rp_attr_t  attr,    /*+ extra tree id (within the same reg/spc/fam +*/
592  |                GList **finallist,    /*+ answers go here, please +*/
593  |                int    max_count    /*+ max # of answers. RX_ALLANS == unlimited +*/
594  |                )
595  | { 
596  |   GList    *preflist = NULL;
597  |   GList    *datlist = NULL;
598  |   er_ret_t   err; 
599  |   ip_range_t  testrang;
600  |   int        locked = 0;
601  |   ip_keytype_t key_type;
602  |   ip_space_t   spc_id;
603  |   rx_fam_t   fam_id = RP_attr2fam( attr );
604  |   rx_tree_t   *mytree;
605  |   int hits=0;
606  |   ip_prefix_t beginpref;
607  |   
608  | 
609  |   /*  abort on error (but unlock the tree) */  
610  |   ER_dbg_va(FAC_RP, ASP_RP_SRCH_GEN,
611  | 	    "RP_NEW_asc_search:  query %s : mode %d (%s) (par %d) for %s",
612  | 	    DF_get_attribute_name(attr),
613  | 	    search_mode, RX_text_srch_mode(search_mode), par_a, key);
614  | 
615  |   
616  |   /* parse the key into a prefix list */
617  |   if( ( err = IP_smart_conv(key, 0, 0,
618  | 			    &preflist, IP_EXPN, &key_type)) != IP_OK ) {
619  |     /* operational trouble (UT_*) or invalid key (IP_INVARG)*/
620  |     return err; 
621  |   }
622  | 
623  |   /* set the test values */
624  |   IP_smart_range(key, &testrang, IP_EXPN, &key_type);
625  |   
626  |   /* find the tree */
627  |   if( NOERR(err) ) {
628  |     spc_id = IP_pref_b2_space( g_list_first(preflist)->data );
629  |     if( ! NOERR(err = RP_tree_get( &mytree, reg_id, spc_id, attr ))) {
630  |       return err;
631  |     }
632  |   }
633  |   /* the point of no return: now we lock the tree. From here, even if errors
634  |      occur, we still go through all procedure to unlock the tree at the end */
635  |   
636  |   /* lock the tree */
637  |   TH_acquire_read_lock( &(mytree->rwlock) );
638  |   locked = 1;
639  | 
640  |   /* Collection: this procedure is used for some search_modes only */
641  |   if(    search_mode == RX_SRCH_EXLESS 
642  |       || search_mode == RX_SRCH_LESS 
643  |       || search_mode == RX_SRCH_EXACT )  {
644  | 
645  |     /* 1. compose a /32(/128) prefix for beginning of range */
646  |     beginpref.ip = testrang.begin;
647  |     beginpref.bits = IP_sizebits(spc_id);
648  |     
649  |     /* 2. dataleaves collection: look up the beginning prefix in LESS(255) mode */
650  |     if( NOERR(err) ) {
651  |       err = RX_bin_search( RX_SRCH_LESS, 255, 0, mytree, &beginpref, 
652  | 			   &datlist, RX_ANS_ALL);
653  |     }
654  |     
655  |     /* 3. preselection: exclude those that do not include end of range 
656  |      */
657  |     if( NOERR(err) ) {
658  |       rp_begend_preselection(&datlist, fam_id, &testrang);
659  |     }
660  | 
661  |   } /* if exless|less|exact */
662  |   else {
663  |     /* MORE */
664  | 
665  |     /* standard collection using the traditional method: 
666  |        repeat the search for all prefixes and join results */
667  | 
668  |     if( NOERR(err) ) {
669  |       err = rp_preflist_search ( search_mode, par_a, par_b, 
670  | 				 mytree, &preflist, &datlist);
671  |     }
672  |   } /* collection */
673  | 
674  |   ER_dbg_va(FAC_RP, ASP_RP_SRCH_GEN,
675  | 	    "RP_NEW_asc_search: collected %d references ",
676  | 	    g_list_length(datlist));
677  | 
678  | 
679  |   /* 5. processing - using the same processing function */
680  |   if( NOERR(err) ) {
681  |     err = rp_asc_process_datlist( search_mode, par_a, fam_id, 
682  | 				  1, /* one occurence is enough */
683  | 				  &datlist,  
684  | 				  &testrang,  &hits );
685  |   }
686  |   
687  |   /* 6. copy results */
688  |   if( NOERR(err) ) {
689  |     err = rp_srch_copyresults(datlist, finallist, max_count); /* and uniq */
690  |   }
691  | 
692  |   if( locked ) {
693  |     /* 100. unlock the tree */
694  |     TH_release_read_lock( &(mytree->rwlock) );
695  |   }
696  | 
697  |   /* clean up */
698  |   wr_clear_list( &preflist ); 
699  |   wr_clear_list( &datlist );  
700  | 
701  |   /* NOTE if error occured, finallist may be partly filled in. */
702  |   return err;
703  | }
704  |