noffle /tags/start/www/src/filter.c

Language C Lines 324
MD5 Hash 5cf9ddb825d124b28a34c3e90bf3bbe5 Estimated Cost $6,302 (why?)
Repository https://noffle.svn.sourceforge.net/svnroot/noffle View Raw File
  1
  2
  3
  4
  5
  6
  7
  8
  9
 10
 11
 12
 13
 14
 15
 16
 17
 18
 19
 20
 21
 22
 23
 24
 25
 26
 27
 28
 29
 30
 31
 32
 33
 34
 35
 36
 37
 38
 39
 40
 41
 42
 43
 44
 45
 46
 47
 48
 49
 50
 51
 52
 53
 54
 55
 56
 57
 58
 59
 60
 61
 62
 63
 64
 65
 66
 67
 68
 69
 70
 71
 72
 73
 74
 75
 76
 77
 78
 79
 80
 81
 82
 83
 84
 85
 86
 87
 88
 89
 90
 91
 92
 93
 94
 95
 96
 97
 98
 99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
/*
  filter.c
  
  Article filtering.
  
  $Id: filter.c 346 2001-12-12 13:32:38Z bears $
*/

#if HAVE_CONFIG_H
#include <config.h>
#endif

#include <ctype.h>
#include "common.h"
#include "filter.h"
#include "itemlist.h"
#include "log.h"
#include "wildmat.h"
#include "group.h"

struct
{
    int nFilters;
    int maxFilters;
    const Filter **filters;
    Bool needGroups;
} filter = { 0, 0, NULL, FALSE };

static unsigned long
countGroups( const char *grps )
{
    unsigned long res;

    res = 1;
    while ( *grps != '\0' )
    {
	if ( *grps == ',' )
	    res++;
	grps++;
    }

    return res;
}
static unsigned long
countRefs( const char *refs )
{
    unsigned long res;
    Bool inRef;

    res = 0;
    inRef = FALSE;

    while ( *refs != '\0' )
    {
	if ( inRef )
	{
	    if ( *refs == '>' )
	    {
		inRef = FALSE;
		res++;
	    }
	}
	else if ( *refs == '<' )
	    inRef = TRUE;
	refs++;
    }

    return res;
}

/* Check a single rule to see if it passes. */
static Bool
checkRule( const char *thisGrp, const char *newsgroups,
	   const Over *ov, const FilterRule *r )
{
    unsigned long ul;
    ItemList *grps;
    const char *p;
    
    switch( r->type )
    {
    case RULE_NEWSGROUP:
	if ( Wld_match( thisGrp, r->data.grp ) )
	    return TRUE;
	if ( newsgroups != NULL )
	{
	    grps = new_Itl( newsgroups, " ,\t" );
	    for ( p = Itl_first( grps ); p != NULL; p = Itl_next( grps ) )
		if ( Wld_match( p, r->data.grp ) )
		     return TRUE;
	    del_Itl( grps );
	}
	return FALSE;

    case RULE_SUBJECT:
	return ( regexec( &r->data.regex, Ov_subj( ov ), 0, NULL, 0 ) == 0 );

    case RULE_FROM:
	return ( regexec( &r->data.regex, Ov_from( ov ), 0, NULL, 0 ) == 0 );

    case RULE_BYTES_LT:
	return ( Ov_bytes( ov ) < r->data.amount );

    case RULE_BYTES_EQ:
	return ( Ov_bytes( ov ) == r->data.amount );

    case RULE_BYTES_GT:
	return ( Ov_bytes( ov ) > r->data.amount );

    case RULE_LINES_LT:
	return ( Ov_lines( ov ) < r->data.amount );

    case RULE_LINES_EQ:
	return ( Ov_lines( ov ) == r->data.amount );

    case RULE_LINES_GT:
	return ( Ov_lines( ov ) > r->data.amount );

    case RULE_MSGID:
	return ( regexec( &r->data.regex, Ov_msgId( ov ), 0, NULL, 0 ) == 0 );

    case RULE_NOREFS_LT:
	ul = countRefs( Ov_ref( ov ) );
	return ( ul < r->data.amount );

    case RULE_NOREFS_EQ:
	ul = countRefs( Ov_ref( ov ) );
	return ( ul == r->data.amount );

    case RULE_NOREFS_GT:
	ul = countRefs( Ov_ref( ov ) );
	return ( ul > r->data.amount );

    case RULE_XPOSTS_LT:
	if ( newsgroups == NULL )
	    return FALSE;
	ul = countGroups( newsgroups );
	return ( ul < r->data.amount );

    case RULE_XPOSTS_EQ:
	if ( newsgroups == NULL )
	    return FALSE;
	ul = countGroups( newsgroups );
	return ( ul == r->data.amount );

    case RULE_XPOSTS_GT:
	if ( newsgroups == NULL )
	    return FALSE;
	ul = countGroups( newsgroups );
	return ( ul > r->data.amount );

    case RULE_POST_STATUS:
	if ( Grp_postAllow( thisGrp ) == r->data.postAllow )
	    return TRUE;
        return FALSE;

    }

    ASSERT( FALSE );	/* Shouldn't get here */
    return 0;		/* Keep compiler quiet */
}

/* Check a single filter to see if it fires. */
static Bool
checkFilter( const char *thisGrp, const char *newsgroups,
	     const Over *ov, const Filter *f )
{
    int i;

    for ( i = 0; i < f->nRules; i++ )
	if ( ! checkRule( thisGrp, newsgroups, ov, &f->rules[i] ) )
	     return FALSE;

    return TRUE;
}

/* Add a filter to the list of filters. */
void
Flt_addFilter( const Filter *f )
{
    ASSERT( f != NULL );

    if ( ( filter.nFilters + 1 ) > filter.maxFilters )
    {
	filter.filters =
	    ( const Filter ** ) realloc( filter.filters,
					 ( filter.maxFilters + 5 )
					 * sizeof( Filter * ) );
	if ( filter.filters == NULL )
	{
	    Log_err( "Could not realloc filter list" );
	    exit( EXIT_FAILURE );
	}
	filter.maxFilters += 5;
    }
    filter.filters[ filter.nFilters++ ] = f;
}

/*
 * Run the rules over the supplied overview. If a specific rule fires,
 * returns its action. If no rule fires, or a rule specifying the default
 * action fires, return the default read mode.
 */
FilterAction
Flt_checkFilters( const char *thisGrp, const char *newsgroups,
		  const Over *ov, FetchMode mode )
{
    int i;

    for ( i = 0; i < filter.nFilters; i++ )
	if ( checkFilter( thisGrp, newsgroups, ov, filter.filters[ i ] ) )
	{
	    FilterAction action = filter.filters[ i ]->action;
	    
	    Log_dbg( LOG_DBG_FILTER,
		     "Filter %d fired on message %s",
		     i, Ov_msgId( ov ) );
	    if ( action == FILTER_DEFAULT )
		break;
	    else
		return action;
	}

    switch( mode )
    {
    case FULL:		return FILTER_FULL;
    case THREAD:	return FILTER_THREAD;
    case OVER:		return FILTER_XOVER;
    }

    ASSERT( FALSE );	/* Shouldn't get here */
    return FILTER_FULL;	/* Keep compiler quiet */
}

Filter *
new_Filter( void )
{
    Filter *f;

    if ( ! ( f = ( Filter * ) malloc( sizeof( Filter ) ) ) )
    {
        Log_err( "Cannot allocate Filter" );
        exit( EXIT_FAILURE );
    }
    f->nRules = 0;
    f->maxRules = 0;
    f->rules = NULL;
    f->action = FILTER_DEFAULT;
    return f;
}

void
del_Filter( Filter *f )
{
    if ( f == NULL )
	return;

    if ( f->rules != NULL )
	free( f->rules );
    free( f );    
}

FilterAction
Flt_action( const Filter *f )
{
    return f->action;
}

int
Flt_nRules( const Filter *f )
{
    return f->nRules;
}

/*
 * Do we have a rule requiring us to fetch the Newsgroups: headers of
 * articles?
 */
Bool
Flt_getNewsgroups( void )
{
    return filter.needGroups;
}

FilterRule
Flt_rule( const Filter *f, int ruleNo )
{
    ASSERT( ruleNo < f->nRules );
    return f->rules[ ruleNo ];
}

void
Flt_setAction( Filter *f, FilterAction action )
{
    f->action = action;
}

void
Flt_addRule( Filter *f, FilterRule rule )
{
    /* Does the rule require Newsgroups: headers to be fetched? */
    if ( rule.type == RULE_NEWSGROUP ||
	 ( rule.type >= RULE_XPOSTS_LT && rule.type <= RULE_XPOSTS_GT ) )
	filter.needGroups = TRUE;
	
    if ( f->nRules + 1 > f->maxRules )
    {
	f->rules =
	    ( FilterRule * ) realloc( f->rules,
				      ( f->maxRules + 5 )
				      * sizeof( FilterRule ) );

	if ( f->rules == NULL )
	{
	    Log_err( "Could not realloc rule list" );
	    exit( EXIT_FAILURE );
	}
	f->maxRules += 5;
    }
    f->rules[ f->nRules++ ] = rule;
}
Back to Top