Mercurial > noffle
annotate src/filter.c @ 500:614a3177b15c noffle tip
Add mail-from option.
Some modern mail systems will try and ensure the sender email is a legitimate
address. Which will fail if there isn't such an address.
author | Jim Hague <jim.hague@acm.org> |
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date | Wed, 14 Aug 2013 12:04:39 +0100 |
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rev | line source |
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128 | 1 /* |
2 filter.c | |
3 | |
4 Article filtering. | |
5 | |
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6 $Id: filter.c 628 2004-10-13 21:59:41Z bears $ |
128 | 7 */ |
8 | |
9 #if HAVE_CONFIG_H | |
10 #include <config.h> | |
11 #endif | |
12 | |
13 #include <ctype.h> | |
14 #include "common.h" | |
249 | 15 #include "configfile.h" |
128 | 16 #include "itemlist.h" |
17 #include "log.h" | |
18 #include "wildmat.h" | |
212 | 19 #include "group.h" |
249 | 20 #include "util.h" |
21 #include "filter.h" | |
128 | 22 |
23 struct | |
24 { | |
25 int nFilters; | |
26 int maxFilters; | |
27 const Filter **filters; | |
28 Bool needGroups; | |
29 } filter = { 0, 0, NULL, FALSE }; | |
30 | |
31 static unsigned long | |
32 countGroups( const char *grps ) | |
33 { | |
34 unsigned long res; | |
35 | |
36 res = 1; | |
37 while ( *grps != '\0' ) | |
38 { | |
39 if ( *grps == ',' ) | |
40 res++; | |
41 grps++; | |
42 } | |
43 | |
44 return res; | |
45 } | |
46 static unsigned long | |
47 countRefs( const char *refs ) | |
48 { | |
49 unsigned long res; | |
50 Bool inRef; | |
51 | |
52 res = 0; | |
53 inRef = FALSE; | |
54 | |
55 while ( *refs != '\0' ) | |
56 { | |
57 if ( inRef ) | |
58 { | |
59 if ( *refs == '>' ) | |
60 { | |
61 inRef = FALSE; | |
62 res++; | |
63 } | |
64 } | |
65 else if ( *refs == '<' ) | |
66 inRef = TRUE; | |
67 refs++; | |
68 } | |
69 | |
70 return res; | |
71 } | |
72 | |
73 /* Check a single rule to see if it passes. */ | |
74 static Bool | |
75 checkRule( const char *thisGrp, const char *newsgroups, | |
76 const Over *ov, const FilterRule *r ) | |
77 { | |
78 unsigned long ul; | |
79 ItemList *grps; | |
80 const char *p; | |
249 | 81 time_t articletime; |
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82 Bool res; |
128 | 83 |
84 switch( r->type ) | |
85 { | |
86 case RULE_NEWSGROUP: | |
87 if ( Wld_match( thisGrp, r->data.grp ) ) | |
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88 { |
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89 Log_dbg( LOG_DBG_FILTER, |
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90 "Newsgroup rule: %s matches current group", |
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91 r->data.grp, thisGrp ); |
128 | 92 return TRUE; |
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93 } |
128 | 94 if ( newsgroups != NULL ) |
95 { | |
96 grps = new_Itl( newsgroups, " ,\t" ); | |
97 for ( p = Itl_first( grps ); p != NULL; p = Itl_next( grps ) ) | |
98 if ( Wld_match( p, r->data.grp ) ) | |
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99 { |
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100 Log_dbg( LOG_DBG_FILTER, |
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101 "Newsgroup rule: %s matched in %s", |
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102 r->data.grp, newsgroups ); |
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103 return TRUE; |
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104 } |
128 | 105 del_Itl( grps ); |
106 } | |
107 return FALSE; | |
108 | |
109 case RULE_SUBJECT: | |
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110 res = ( regexec( &r->data.regex, Ov_subj( ov ), 0, NULL, 0 ) == 0 ); |
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111 if ( res ) |
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112 Log_dbg( LOG_DBG_FILTER, |
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113 "Subject rule: %s matches", |
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114 Ov_subj( ov ) ); |
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115 return res; |
128 | 116 |
249 | 117 case RULE_REFERENCE: /* kill thread by Msg-Id in References: */ |
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118 res = ( regexec( &r->data.regex, Ov_ref( ov ), 0, NULL, 0 ) == 0 ); |
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119 if ( res ) |
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120 Log_dbg( LOG_DBG_FILTER, |
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121 "Reference rule: %s matches", |
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122 Ov_ref( ov ) ); |
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123 return res; |
249 | 124 |
128 | 125 case RULE_FROM: |
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126 res = ( regexec( &r->data.regex, Ov_from( ov ), 0, NULL, 0 ) == 0 ); |
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127 if ( res ) |
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128 Log_dbg( LOG_DBG_FILTER, |
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129 "From rule: %s matches", |
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130 Ov_from( ov ) ); |
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131 return res; |
128 | 132 |
133 case RULE_BYTES_LT: | |
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134 res = ( Ov_bytes( ov ) < r->data.amount ); |
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135 if ( res ) |
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136 Log_dbg( LOG_DBG_FILTER, |
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137 "Length rule: bytes %d < %d", |
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138 Ov_bytes( ov ), r->data.amount ); |
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139 return res; |
128 | 140 |
141 case RULE_BYTES_EQ: | |
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142 res = ( Ov_bytes( ov ) == r->data.amount ); |
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143 if ( res ) |
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144 Log_dbg( LOG_DBG_FILTER, |
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145 "Length rule: bytes %d = %d", |
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146 Ov_bytes( ov ), r->data.amount ); |
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147 return res; |
128 | 148 |
149 case RULE_BYTES_GT: | |
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150 res = ( Ov_bytes( ov ) > r->data.amount ); |
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151 if ( res ) |
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152 Log_dbg( LOG_DBG_FILTER, |
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153 "Length rule: bytes %d > %d", |
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154 Ov_bytes( ov ), r->data.amount ); |
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155 return res; |
128 | 156 |
157 case RULE_LINES_LT: | |
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158 res = ( Ov_lines( ov ) < r->data.amount ); |
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159 if ( res ) |
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160 Log_dbg( LOG_DBG_FILTER, |
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161 "Length rule: lines %d < %d", |
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162 Ov_lines( ov ), r->data.amount ); |
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163 return res; |
128 | 164 |
165 case RULE_LINES_EQ: | |
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166 res = ( Ov_lines( ov ) == r->data.amount ); |
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167 if ( res ) |
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168 Log_dbg( LOG_DBG_FILTER, |
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169 "Length rule: lines %d = %d", |
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170 Ov_lines( ov ), r->data.amount ); |
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171 return res; |
128 | 172 |
173 case RULE_LINES_GT: | |
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174 res = ( Ov_lines( ov ) > r->data.amount ); |
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175 if ( res ) |
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176 Log_dbg( LOG_DBG_FILTER, |
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177 "Length rule: lines %d > %d", |
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178 Ov_lines( ov ), r->data.amount ); |
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179 return res; |
128 | 180 |
181 case RULE_MSGID: | |
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182 res = ( regexec( &r->data.regex, Ov_msgId( ov ), 0, NULL, 0 ) == 0 ); |
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183 if ( res ) |
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184 Log_dbg( LOG_DBG_FILTER, |
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185 "Msg-Id rule: %s matches", |
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186 Ov_msgId( ov ) ); |
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187 return res; |
128 | 188 |
249 | 189 case RULE_DATE_LT: |
190 /* Utl_parseNewsDate() is quite picky. I'm not entirely happy | |
191 about this, but I won't implement a relaxed date parser. */ | |
192 articletime = Utl_parseNewsDate( Ov_date( ov ) ); | |
193 if ( articletime == (time_t) -1 ) | |
194 return FALSE; | |
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195 res = ( articletime < r->data.reftime.calctime ); |
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196 if ( res ) |
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197 Log_dbg( LOG_DBG_FILTER, |
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198 "Date before rule: %s matches", |
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199 Ov_date( ov ) ); |
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200 return res; |
249 | 201 |
202 case RULE_DATE_EQ: | |
203 articletime = Utl_parseNewsDate( Ov_date( ov ) ); | |
204 if ( ( articletime == (time_t) -1) | |
205 && ( r->data.reftime.vartime == INVALID )) | |
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206 { |
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207 Log_dbg( LOG_DBG_FILTER, |
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208 "Date equals rule: invalid date matches" ); |
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209 return TRUE; |
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210 } |
249 | 211 if ( ( articletime == (time_t) -1) |
212 != ( r->data.reftime.vartime == INVALID )) | |
213 return FALSE; | |
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214 res = ( ( articletime <= r->data.reftime.calctime |
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215 + RULE_DATE_EQ_PRECISION ) |
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216 && ( articletime >= r->data.reftime.calctime |
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217 - RULE_DATE_EQ_PRECISION ) ); |
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218 if ( res ) |
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219 Log_dbg( LOG_DBG_FILTER, |
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220 "Date equals rule: %s matches", |
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221 Ov_date( ov ) ); |
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222 return res; |
249 | 223 |
224 case RULE_DATE_GT: | |
225 articletime = Utl_parseNewsDate( Ov_date( ov ) ); | |
226 if ( articletime == (time_t) -1 ) | |
227 return FALSE; | |
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228 res = ( articletime > r->data.reftime.calctime ); |
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229 if ( res ) |
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230 Log_dbg( LOG_DBG_FILTER, |
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231 "Date after rule: %s matches", |
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232 Ov_date( ov ) ); |
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233 return res; |
249 | 234 |
128 | 235 case RULE_NOREFS_LT: |
236 ul = countRefs( Ov_ref( ov ) ); | |
481
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237 res = ( ul < r->data.amount ); |
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238 if ( res ) |
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239 Log_dbg( LOG_DBG_FILTER, |
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240 "Number of references rule: %d < %d", |
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241 ul, r->data.amount ); |
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242 return res; |
128 | 243 |
244 case RULE_NOREFS_EQ: | |
245 ul = countRefs( Ov_ref( ov ) ); | |
481
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246 res = ( ul == r->data.amount ); |
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247 if ( res ) |
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248 Log_dbg( LOG_DBG_FILTER, |
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249 "Number of references rule: %d = %d", |
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250 ul, r->data.amount ); |
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251 return res; |
128 | 252 |
253 case RULE_NOREFS_GT: | |
254 ul = countRefs( Ov_ref( ov ) ); | |
481
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255 res = ( ul > r->data.amount ); |
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256 if ( res ) |
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257 Log_dbg( LOG_DBG_FILTER, |
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258 "Number of references rule: %d > %d", |
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259 ul, r->data.amount ); |
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260 return res; |
128 | 261 |
262 case RULE_XPOSTS_LT: | |
263 if ( newsgroups == NULL ) | |
264 return FALSE; | |
265 ul = countGroups( newsgroups ); | |
481
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266 res = ( ul < r->data.amount ); |
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267 if ( res ) |
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268 Log_dbg( LOG_DBG_FILTER, |
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269 "Number of cross-posts rule: %d < %d", |
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270 ul, r->data.amount ); |
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271 return res; |
128 | 272 |
273 case RULE_XPOSTS_EQ: | |
274 if ( newsgroups == NULL ) | |
275 return FALSE; | |
276 ul = countGroups( newsgroups ); | |
481
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277 res = ( ul == r->data.amount ); |
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278 if ( res ) |
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279 Log_dbg( LOG_DBG_FILTER, |
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280 "Number of cross-posts rule: %d = %d", |
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281 ul, r->data.amount ); |
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282 return res; |
128 | 283 |
284 case RULE_XPOSTS_GT: | |
285 if ( newsgroups == NULL ) | |
286 return FALSE; | |
287 ul = countGroups( newsgroups ); | |
481
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288 res = ( ul > r->data.amount ); |
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289 if ( res ) |
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290 Log_dbg( LOG_DBG_FILTER, |
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291 "Number of cross-posts rule: %d > %d", |
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292 ul, r->data.amount ); |
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293 return res; |
212 | 294 |
295 case RULE_POST_STATUS: | |
296 if ( Grp_postAllow( thisGrp ) == r->data.postAllow ) | |
481
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297 { |
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298 Log_dbg( LOG_DBG_FILTER, |
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299 "Post status rule: group status matches %c", |
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300 r->data.postAllow ); |
212 | 301 return TRUE; |
481
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302 } |
212 | 303 return FALSE; |
304 | |
128 | 305 } |
306 | |
307 ASSERT( FALSE ); /* Shouldn't get here */ | |
185
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308 return 0; /* Keep compiler quiet */ |
128 | 309 } |
310 | |
311 /* Check a single filter to see if it fires. */ | |
312 static Bool | |
313 checkFilter( const char *thisGrp, const char *newsgroups, | |
314 const Over *ov, const Filter *f ) | |
315 { | |
316 int i; | |
317 | |
318 for ( i = 0; i < f->nRules; i++ ) | |
319 if ( ! checkRule( thisGrp, newsgroups, ov, &f->rules[i] ) ) | |
320 return FALSE; | |
321 | |
322 return TRUE; | |
323 } | |
324 | |
325 /* Add a filter to the list of filters. */ | |
326 void | |
327 Flt_addFilter( const Filter *f ) | |
328 { | |
329 ASSERT( f != NULL ); | |
330 | |
331 if ( ( filter.nFilters + 1 ) > filter.maxFilters ) | |
332 { | |
333 filter.filters = | |
334 ( const Filter ** ) realloc( filter.filters, | |
335 ( filter.maxFilters + 5 ) | |
336 * sizeof( Filter * ) ); | |
337 if ( filter.filters == NULL ) | |
281
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338 Log_fatal( "Could not realloc filter list" ); |
128 | 339 filter.maxFilters += 5; |
340 } | |
341 filter.filters[ filter.nFilters++ ] = f; | |
342 } | |
343 | |
249 | 344 |
345 /* | |
346 * Called by Fetch_init(). | |
347 * Must be called before | |
348 * Fetch_getNewGrps(), Client_getNewgrps(), client.c:processGrps() | |
349 * because processGrps() sets the stampfile needed by lastupdate. | |
350 */ | |
351 void | |
352 Flt_init( const char * server ) | |
353 { | |
354 int index1, index2; | |
355 time_t now, lastupdate; | |
356 FilterRule * thisRule ; | |
357 Str filename; | |
358 | |
359 time ( &now ); | |
360 lastupdate = (time_t) 0; /* defaults to start of epoch */ | |
361 | |
362 snprintf( filename, MAXCHAR, "%s/lastupdate.%s", | |
363 Cfg_spoolDir(), server ); | |
364 if ( !Utl_getStamp( &lastupdate , filename ) ) | |
365 /* There's no stamp file if server has never been queried. | |
366 * | |
367 */ | |
368 Log_dbg( LOG_DBG_FILTER, | |
369 "Filter unable to get stamp file %s . Please query server.", filename ); | |
370 | |
371 /* traverse all rules of all filters */ | |
372 | |
373 for ( index1 = 0; index1 < filter.nFilters; index1++ ) | |
374 { | |
375 for ( index2 = 0; index2 < filter.filters[ index1 ] -> nRules; index2++ ) | |
376 { | |
377 thisRule = & ( filter.filters[ index1 ] -> rules[ index2 ] ); | |
378 switch ( thisRule -> type ) | |
379 { | |
380 /* evaluate variable date specs */ | |
381 case RULE_DATE_LT: | |
382 case RULE_DATE_EQ: | |
383 case RULE_DATE_GT: | |
384 thisRule -> data.reftime.calctime = | |
385 thisRule ->data.reftime.timeoffset; | |
386 switch ( thisRule ->data.reftime.vartime ) | |
387 { | |
388 case NOW: | |
389 thisRule -> data.reftime.calctime += now; | |
390 break; | |
391 case LASTUPDATE: | |
392 thisRule -> data.reftime.calctime += lastupdate; | |
393 break; | |
394 default: | |
395 break; | |
396 } /* end switch( ... vartime) */ | |
397 | |
398 /* Silently fix absolute dates before the epoch. | |
399 * This is not the place to mock about strange dates. | |
400 */ | |
401 if ( thisRule -> data.reftime.calctime < (time_t) 0 ) | |
402 thisRule -> data.reftime.calctime = (time_t) 0 ; | |
403 | |
377
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404 #if 0 |
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405 Log_dbg( LOG_DBG_FILTER, "%d: %dl = %dl + %d", |
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406 thisRule -> type, |
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407 (long) thisRule -> data.reftime.calctime, |
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408 (long) thisRule ->data.reftime.timeoffset, |
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409 (int) thisRule ->data.reftime.vartime == NOW |
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410 ? now |
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411 : thisRule ->data.reftime.vartime == LASTUPDATE |
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412 ? lastupdate |
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413 : thisRule ->data.reftime.vartime ); |
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414 #endif |
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415 break; |
249 | 416 default: |
417 break; | |
418 } /* end switch( ... -> type) */ | |
419 } /* end for() */ | |
420 } /* end for() */ | |
421 return ; | |
422 } | |
423 | |
128 | 424 /* |
425 * Run the rules over the supplied overview. If a specific rule fires, | |
194
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426 * returns its action. If no rule fires, or a rule specifying the default |
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427 * action fires, return the default read mode. |
128 | 428 */ |
429 FilterAction | |
430 Flt_checkFilters( const char *thisGrp, const char *newsgroups, | |
431 const Over *ov, FetchMode mode ) | |
432 { | |
433 int i; | |
434 | |
435 for ( i = 0; i < filter.nFilters; i++ ) | |
436 if ( checkFilter( thisGrp, newsgroups, ov, filter.filters[ i ] ) ) | |
437 { | |
194
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438 FilterAction action = filter.filters[ i ]->action; |
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439 |
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440 Log_dbg( LOG_DBG_FILTER, |
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441 "Filter %d fired on message %s", |
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442 i, Ov_msgId( ov ) ); |
194
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443 if ( action == FILTER_DEFAULT ) |
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444 break; |
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445 else |
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446 return action; |
128 | 447 } |
448 | |
449 switch( mode ) | |
450 { | |
451 case FULL: return FILTER_FULL; | |
452 case THREAD: return FILTER_THREAD; | |
453 case OVER: return FILTER_XOVER; | |
454 } | |
455 | |
456 ASSERT( FALSE ); /* Shouldn't get here */ | |
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457 return FILTER_FULL; /* Keep compiler quiet */ |
128 | 458 } |
459 | |
460 Filter * | |
461 new_Filter( void ) | |
462 { | |
463 Filter *f; | |
464 | |
465 if ( ! ( f = ( Filter * ) malloc( sizeof( Filter ) ) ) ) | |
281
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466 Log_fatal( "Cannot allocate Filter" ); |
128 | 467 f->nRules = 0; |
468 f->maxRules = 0; | |
469 f->rules = NULL; | |
194
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470 f->action = FILTER_DEFAULT; |
128 | 471 return f; |
472 } | |
473 | |
474 void | |
475 del_Filter( Filter *f ) | |
476 { | |
477 if ( f == NULL ) | |
478 return; | |
479 | |
480 if ( f->rules != NULL ) | |
481 free( f->rules ); | |
482 free( f ); | |
483 } | |
484 | |
485 FilterAction | |
486 Flt_action( const Filter *f ) | |
487 { | |
488 return f->action; | |
489 } | |
490 | |
491 int | |
492 Flt_nRules( const Filter *f ) | |
493 { | |
494 return f->nRules; | |
495 } | |
496 | |
497 /* | |
498 * Do we have a rule requiring us to fetch the Newsgroups: headers of | |
499 * articles? | |
500 */ | |
501 Bool | |
502 Flt_getNewsgroups( void ) | |
503 { | |
504 return filter.needGroups; | |
505 } | |
506 | |
507 FilterRule | |
508 Flt_rule( const Filter *f, int ruleNo ) | |
509 { | |
510 ASSERT( ruleNo < f->nRules ); | |
511 return f->rules[ ruleNo ]; | |
512 } | |
513 | |
514 void | |
515 Flt_setAction( Filter *f, FilterAction action ) | |
516 { | |
517 f->action = action; | |
518 } | |
519 | |
520 void | |
521 Flt_addRule( Filter *f, FilterRule rule ) | |
522 { | |
523 /* Does the rule require Newsgroups: headers to be fetched? */ | |
524 if ( rule.type == RULE_NEWSGROUP || | |
525 ( rule.type >= RULE_XPOSTS_LT && rule.type <= RULE_XPOSTS_GT ) ) | |
526 filter.needGroups = TRUE; | |
527 | |
528 if ( f->nRules + 1 > f->maxRules ) | |
529 { | |
530 f->rules = | |
531 ( FilterRule * ) realloc( f->rules, | |
532 ( f->maxRules + 5 ) | |
533 * sizeof( FilterRule ) ); | |
534 | |
535 if ( f->rules == NULL ) | |
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536 Log_fatal( "Could not realloc rule list" ); |
128 | 537 f->maxRules += 5; |
538 } | |
539 f->rules[ f->nRules++ ] = rule; | |
540 } | |
541 | |
542 |