Mercurial > noffle
annotate src/filter.c @ 223:ffb1848a39db noffle
[svn] * src/util.c: Improve (correct) error detection when updating
timestamp file.
* src/content.h, src/content.c: Return Boolean success/fail from
Cont_write. Also ensure cont.first isn't polluted in the event
of a failed update.
* src/client.c,src/control.c,src/fetch.c,src/noffle.c,src/post.c,
src/pseudo.c: If Cont_write fails, don't do actions that need it to
have worked. Typically, don't update first and last article numbers
in group database.
* src/server.c: If groupinfo.lastupdate is unreadable or corrupt,
spot this and report it and give an explicit error when processing
NNTP NEWGROUPS command.
| author | bears |
|---|---|
| date | Sun, 09 Dec 2001 12:31:57 +0000 |
| parents | 21200ce10e68 |
| children | 0340b9c17edc |
| rev | line source |
|---|---|
| 128 | 1 /* |
| 2 filter.c | |
| 3 | |
| 4 Article filtering. | |
| 5 | |
| 212 | 6 $Id: filter.c 331 2001-11-22 12:04:45Z mirkol $ |
| 128 | 7 */ |
| 8 | |
| 9 #if HAVE_CONFIG_H | |
| 10 #include <config.h> | |
| 11 #endif | |
| 12 | |
| 13 #include <ctype.h> | |
| 14 #include "common.h" | |
|
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15 #include "filter.h" |
| 128 | 16 #include "itemlist.h" |
| 17 #include "log.h" | |
| 18 #include "wildmat.h" | |
| 212 | 19 #include "group.h" |
| 128 | 20 |
| 21 struct | |
| 22 { | |
| 23 int nFilters; | |
| 24 int maxFilters; | |
| 25 const Filter **filters; | |
| 26 Bool needGroups; | |
| 27 } filter = { 0, 0, NULL, FALSE }; | |
| 28 | |
| 29 static unsigned long | |
| 30 countGroups( const char *grps ) | |
| 31 { | |
| 32 unsigned long res; | |
| 33 | |
| 34 res = 1; | |
| 35 while ( *grps != '\0' ) | |
| 36 { | |
| 37 if ( *grps == ',' ) | |
| 38 res++; | |
| 39 grps++; | |
| 40 } | |
| 41 | |
| 42 return res; | |
| 43 } | |
| 44 static unsigned long | |
| 45 countRefs( const char *refs ) | |
| 46 { | |
| 47 unsigned long res; | |
| 48 Bool inRef; | |
| 49 | |
| 50 res = 0; | |
| 51 inRef = FALSE; | |
| 52 | |
| 53 while ( *refs != '\0' ) | |
| 54 { | |
| 55 if ( inRef ) | |
| 56 { | |
| 57 if ( *refs == '>' ) | |
| 58 { | |
| 59 inRef = FALSE; | |
| 60 res++; | |
| 61 } | |
| 62 } | |
| 63 else if ( *refs == '<' ) | |
| 64 inRef = TRUE; | |
| 65 refs++; | |
| 66 } | |
| 67 | |
| 68 return res; | |
| 69 } | |
| 70 | |
| 71 /* Check a single rule to see if it passes. */ | |
| 72 static Bool | |
| 73 checkRule( const char *thisGrp, const char *newsgroups, | |
| 74 const Over *ov, const FilterRule *r ) | |
| 75 { | |
| 76 unsigned long ul; | |
| 77 ItemList *grps; | |
| 78 const char *p; | |
| 79 | |
| 80 switch( r->type ) | |
| 81 { | |
| 82 case RULE_NEWSGROUP: | |
| 83 if ( Wld_match( thisGrp, r->data.grp ) ) | |
| 84 return TRUE; | |
| 85 if ( newsgroups != NULL ) | |
| 86 { | |
| 87 grps = new_Itl( newsgroups, " ,\t" ); | |
| 88 for ( p = Itl_first( grps ); p != NULL; p = Itl_next( grps ) ) | |
| 89 if ( Wld_match( p, r->data.grp ) ) | |
| 90 return TRUE; | |
| 91 del_Itl( grps ); | |
| 92 } | |
| 93 return FALSE; | |
| 94 | |
| 95 case RULE_SUBJECT: | |
| 96 return ( regexec( &r->data.regex, Ov_subj( ov ), 0, NULL, 0 ) == 0 ); | |
| 97 | |
| 98 case RULE_FROM: | |
| 99 return ( regexec( &r->data.regex, Ov_from( ov ), 0, NULL, 0 ) == 0 ); | |
| 100 | |
| 101 case RULE_BYTES_LT: | |
| 102 return ( Ov_bytes( ov ) < r->data.amount ); | |
| 103 | |
| 104 case RULE_BYTES_EQ: | |
| 105 return ( Ov_bytes( ov ) == r->data.amount ); | |
| 106 | |
| 107 case RULE_BYTES_GT: | |
| 108 return ( Ov_bytes( ov ) > r->data.amount ); | |
| 109 | |
| 110 case RULE_LINES_LT: | |
| 111 return ( Ov_lines( ov ) < r->data.amount ); | |
| 112 | |
| 113 case RULE_LINES_EQ: | |
| 114 return ( Ov_lines( ov ) == r->data.amount ); | |
| 115 | |
| 116 case RULE_LINES_GT: | |
| 117 return ( Ov_lines( ov ) > r->data.amount ); | |
| 118 | |
| 119 case RULE_MSGID: | |
| 120 return ( regexec( &r->data.regex, Ov_msgId( ov ), 0, NULL, 0 ) == 0 ); | |
| 121 | |
| 122 case RULE_NOREFS_LT: | |
| 123 ul = countRefs( Ov_ref( ov ) ); | |
| 124 return ( ul < r->data.amount ); | |
| 125 | |
| 126 case RULE_NOREFS_EQ: | |
| 127 ul = countRefs( Ov_ref( ov ) ); | |
| 128 return ( ul == r->data.amount ); | |
| 129 | |
| 130 case RULE_NOREFS_GT: | |
| 131 ul = countRefs( Ov_ref( ov ) ); | |
| 132 return ( ul > r->data.amount ); | |
| 133 | |
| 134 case RULE_XPOSTS_LT: | |
| 135 if ( newsgroups == NULL ) | |
| 136 return FALSE; | |
| 137 ul = countGroups( newsgroups ); | |
| 138 return ( ul < r->data.amount ); | |
| 139 | |
| 140 case RULE_XPOSTS_EQ: | |
| 141 if ( newsgroups == NULL ) | |
| 142 return FALSE; | |
| 143 ul = countGroups( newsgroups ); | |
| 144 return ( ul == r->data.amount ); | |
| 145 | |
| 146 case RULE_XPOSTS_GT: | |
| 147 if ( newsgroups == NULL ) | |
| 148 return FALSE; | |
| 149 ul = countGroups( newsgroups ); | |
| 150 return ( ul > r->data.amount ); | |
| 212 | 151 |
| 152 case RULE_POST_STATUS: | |
| 153 if ( Grp_postAllow( thisGrp ) == r->data.postAllow ) | |
| 154 return TRUE; | |
| 155 return FALSE; | |
| 156 | |
| 128 | 157 } |
| 158 | |
| 159 ASSERT( FALSE ); /* Shouldn't get here */ | |
|
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160 return 0; /* Keep compiler quiet */ |
| 128 | 161 } |
| 162 | |
| 163 /* Check a single filter to see if it fires. */ | |
| 164 static Bool | |
| 165 checkFilter( const char *thisGrp, const char *newsgroups, | |
| 166 const Over *ov, const Filter *f ) | |
| 167 { | |
| 168 int i; | |
| 169 | |
| 170 for ( i = 0; i < f->nRules; i++ ) | |
| 171 if ( ! checkRule( thisGrp, newsgroups, ov, &f->rules[i] ) ) | |
| 172 return FALSE; | |
| 173 | |
| 174 return TRUE; | |
| 175 } | |
| 176 | |
| 177 /* Add a filter to the list of filters. */ | |
| 178 void | |
| 179 Flt_addFilter( const Filter *f ) | |
| 180 { | |
| 181 ASSERT( f != NULL ); | |
| 182 | |
| 183 if ( ( filter.nFilters + 1 ) > filter.maxFilters ) | |
| 184 { | |
| 185 filter.filters = | |
| 186 ( const Filter ** ) realloc( filter.filters, | |
| 187 ( filter.maxFilters + 5 ) | |
| 188 * sizeof( Filter * ) ); | |
| 189 if ( filter.filters == NULL ) | |
| 190 { | |
| 191 Log_err( "Could not realloc filter list" ); | |
| 192 exit( EXIT_FAILURE ); | |
| 193 } | |
| 194 filter.maxFilters += 5; | |
| 195 } | |
| 196 filter.filters[ filter.nFilters++ ] = f; | |
| 197 } | |
| 198 | |
| 199 /* | |
| 200 * Run the rules over the supplied overview. If a specific rule fires, | |
|
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201 * returns its action. If no rule fires, or a rule specifying the default |
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202 * action fires, return the default read mode. |
| 128 | 203 */ |
| 204 FilterAction | |
| 205 Flt_checkFilters( const char *thisGrp, const char *newsgroups, | |
| 206 const Over *ov, FetchMode mode ) | |
| 207 { | |
| 208 int i; | |
| 209 | |
| 210 for ( i = 0; i < filter.nFilters; i++ ) | |
| 211 if ( checkFilter( thisGrp, newsgroups, ov, filter.filters[ i ] ) ) | |
| 212 { | |
|
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213 FilterAction action = filter.filters[ i ]->action; |
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214 |
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215 Log_dbg( LOG_DBG_FILTER, |
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216 "Filter %d fired on message %s", |
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217 i, Ov_msgId( ov ) ); |
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218 if ( action == FILTER_DEFAULT ) |
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219 break; |
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220 else |
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221 return action; |
| 128 | 222 } |
| 223 | |
| 224 switch( mode ) | |
| 225 { | |
| 226 case FULL: return FILTER_FULL; | |
| 227 case THREAD: return FILTER_THREAD; | |
| 228 case OVER: return FILTER_XOVER; | |
| 229 } | |
| 230 | |
| 231 ASSERT( FALSE ); /* Shouldn't get here */ | |
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232 return FILTER_FULL; /* Keep compiler quiet */ |
| 128 | 233 } |
| 234 | |
| 235 Filter * | |
| 236 new_Filter( void ) | |
| 237 { | |
| 238 Filter *f; | |
| 239 | |
| 240 if ( ! ( f = ( Filter * ) malloc( sizeof( Filter ) ) ) ) | |
| 241 { | |
| 242 Log_err( "Cannot allocate Filter" ); | |
| 243 exit( EXIT_FAILURE ); | |
| 244 } | |
| 245 f->nRules = 0; | |
| 246 f->maxRules = 0; | |
| 247 f->rules = NULL; | |
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248 f->action = FILTER_DEFAULT; |
| 128 | 249 return f; |
| 250 } | |
| 251 | |
| 252 void | |
| 253 del_Filter( Filter *f ) | |
| 254 { | |
| 255 if ( f == NULL ) | |
| 256 return; | |
| 257 | |
| 258 if ( f->rules != NULL ) | |
| 259 free( f->rules ); | |
| 260 free( f ); | |
| 261 } | |
| 262 | |
| 263 FilterAction | |
| 264 Flt_action( const Filter *f ) | |
| 265 { | |
| 266 return f->action; | |
| 267 } | |
| 268 | |
| 269 int | |
| 270 Flt_nRules( const Filter *f ) | |
| 271 { | |
| 272 return f->nRules; | |
| 273 } | |
| 274 | |
| 275 /* | |
| 276 * Do we have a rule requiring us to fetch the Newsgroups: headers of | |
| 277 * articles? | |
| 278 */ | |
| 279 Bool | |
| 280 Flt_getNewsgroups( void ) | |
| 281 { | |
| 282 return filter.needGroups; | |
| 283 } | |
| 284 | |
| 285 FilterRule | |
| 286 Flt_rule( const Filter *f, int ruleNo ) | |
| 287 { | |
| 288 ASSERT( ruleNo < f->nRules ); | |
| 289 return f->rules[ ruleNo ]; | |
| 290 } | |
| 291 | |
| 292 void | |
| 293 Flt_setAction( Filter *f, FilterAction action ) | |
| 294 { | |
| 295 f->action = action; | |
| 296 } | |
| 297 | |
| 298 void | |
| 299 Flt_addRule( Filter *f, FilterRule rule ) | |
| 300 { | |
| 301 /* Does the rule require Newsgroups: headers to be fetched? */ | |
| 302 if ( rule.type == RULE_NEWSGROUP || | |
| 303 ( rule.type >= RULE_XPOSTS_LT && rule.type <= RULE_XPOSTS_GT ) ) | |
| 304 filter.needGroups = TRUE; | |
| 305 | |
| 306 if ( f->nRules + 1 > f->maxRules ) | |
| 307 { | |
| 308 f->rules = | |
| 309 ( FilterRule * ) realloc( f->rules, | |
| 310 ( f->maxRules + 5 ) | |
| 311 * sizeof( FilterRule ) ); | |
| 312 | |
| 313 if ( f->rules == NULL ) | |
| 314 { | |
| 315 Log_err( "Could not realloc rule list" ); | |
| 316 exit( EXIT_FAILURE ); | |
| 317 } | |
| 318 f->maxRules += 5; | |
| 319 } | |
| 320 f->rules[ f->nRules++ ] = rule; | |
| 321 } | |
| 322 | |
| 323 |