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184e8823 | 1 | /* $Cambridge: exim/src/src/lookups/lsearch.c,v 1.8 2007/01/08 10:50:19 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
184e8823 | 7 | /* Copyright (c) University of Cambridge 1995 - 2007 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | #include "../exim.h" | |
11 | #include "lf_functions.h" | |
12 | #include "lsearch.h" | |
13 | ||
14 | /* Codes for the different kinds of lsearch that are supported */ | |
15 | ||
16 | enum { | |
17 | LSEARCH_PLAIN, /* Literal keys */ | |
18 | LSEARCH_WILD, /* Wild card keys, expanded */ | |
19 | LSEARCH_NWILD, /* Wild card keys, not expanded */ | |
20 | LSEARCH_IP /* IP addresses and networks */ | |
21 | }; | |
22 | ||
23 | ||
24 | ||
25 | /************************************************* | |
26 | * Open entry point * | |
27 | *************************************************/ | |
28 | ||
29 | /* See local README for interface description */ | |
30 | ||
31 | void * | |
32 | lsearch_open(uschar *filename, uschar **errmsg) | |
33 | { | |
34 | FILE *f = Ufopen(filename, "rb"); | |
35 | if (f == NULL) | |
36 | { | |
37 | int save_errno = errno; | |
38 | *errmsg = string_open_failed(errno, "%s for linear search", filename); | |
39 | errno = save_errno; | |
40 | return NULL; | |
41 | } | |
42 | return f; | |
43 | } | |
44 | ||
45 | ||
46 | ||
47 | /************************************************* | |
48 | * Check entry point * | |
49 | *************************************************/ | |
50 | ||
51 | BOOL | |
52 | lsearch_check(void *handle, uschar *filename, int modemask, uid_t *owners, | |
53 | gid_t *owngroups, uschar **errmsg) | |
54 | { | |
55 | return lf_check_file(fileno((FILE *)handle), filename, S_IFREG, modemask, | |
56 | owners, owngroups, "lsearch", errmsg) == 0; | |
57 | } | |
58 | ||
59 | ||
60 | ||
61 | /************************************************* | |
62 | * Internal function for the various lsearches * | |
63 | *************************************************/ | |
64 | ||
65 | /* See local README for interface description, plus: | |
66 | ||
67 | Extra argument: | |
68 | ||
69 | type one of the values LSEARCH_PLAIN, LSEARCH_WILD, LSEARCH_NWILD, or | |
70 | LSEARCH_IP | |
71 | ||
72 | There is some messy logic in here to cope with very long data lines that do not | |
73 | fit into the fixed sized buffer. Most of the time this will never be exercised, | |
74 | but people do occasionally do weird things. */ | |
75 | ||
76 | static int | |
77 | internal_lsearch_find(void *handle, uschar *filename, uschar *keystring, | |
78 | int length, uschar **result, uschar **errmsg, int type) | |
79 | { | |
80 | FILE *f = (FILE *)handle; | |
81 | BOOL last_was_eol = TRUE; | |
82 | BOOL this_is_eol = TRUE; | |
83 | int old_pool = store_pool; | |
84 | void *reset_point = NULL; | |
85 | uschar buffer[4096]; | |
86 | ||
87 | /* Wildcard searches may use up some store, because of expansions. We don't | |
88 | want them to fill up our search store. What we do is set the pool to the main | |
89 | pool and get a point to reset to later. Wildcard searches could also issue | |
90 | lookups, but internal_search_find will take care of that, and the cache will be | |
91 | safely stored in the search pool again. */ | |
92 | ||
93 | if(type == LSEARCH_WILD || type == LSEARCH_NWILD) | |
94 | { | |
95 | store_pool = POOL_MAIN; | |
96 | reset_point = store_get(0); | |
97 | } | |
98 | ||
99 | filename = filename; /* Keep picky compilers happy */ | |
100 | errmsg = errmsg; | |
101 | ||
102 | rewind(f); | |
103 | for (last_was_eol = TRUE; | |
104 | Ufgets(buffer, sizeof(buffer), f) != NULL; | |
105 | last_was_eol = this_is_eol) | |
106 | { | |
107 | int ptr, size; | |
108 | int p = Ustrlen(buffer); | |
109 | int linekeylength; | |
110 | uschar *yield; | |
111 | uschar *s = buffer; | |
112 | ||
113 | /* Check whether this the final segment of a line. If it follows an | |
114 | incomplete part-line, skip it. */ | |
115 | ||
116 | this_is_eol = p > 0 && buffer[p-1] == '\n'; | |
117 | if (!last_was_eol) continue; | |
118 | ||
119 | /* We now have the start of a physical line. If this is a final line segment, | |
120 | remove trailing white space. */ | |
121 | ||
122 | if (this_is_eol) | |
123 | { | |
124 | while (p > 0 && isspace((uschar)buffer[p-1])) p--; | |
125 | buffer[p] = 0; | |
126 | } | |
127 | ||
128 | /* If the buffer is empty it might be (a) a complete empty line, or (b) the | |
129 | start of a line that begins with so much white space that it doesn't all fit | |
130 | in the buffer. In both cases we want to skip the entire physical line. | |
131 | ||
132 | If the buffer begins with # it is a comment line; if it begins with white | |
133 | space it is a logical continuation; again, we want to skip the entire | |
134 | physical line. */ | |
135 | ||
136 | if (buffer[0] == 0 || buffer[0] == '#' || isspace(buffer[0])) continue; | |
137 | ||
138 | /* We assume that they key will fit in the buffer. If the key starts with ", | |
139 | read it as a quoted string. We don't use string_dequote() because that uses | |
140 | new store for the result, and we may be doing this many times in a long file. | |
141 | We know that the dequoted string must be shorter than the original, because | |
142 | we are removing the quotes, and also any escape sequences always turn two or | |
143 | more characters into one character. Therefore, we can store the new string in | |
144 | the same buffer. */ | |
145 | ||
146 | if (*s == '\"') | |
147 | { | |
148 | uschar *t = s++; | |
149 | while (*s != 0 && *s != '\"') | |
150 | { | |
151 | if (*s == '\\') *t++ = string_interpret_escape(&s); | |
152 | else *t++ = *s; | |
153 | s++; | |
154 | } | |
155 | if (*s != 0) s++; /* Past terminating " */ | |
156 | linekeylength = t - buffer; | |
157 | } | |
158 | ||
159 | /* Otherwise it is terminated by a colon or white space */ | |
160 | ||
161 | else | |
162 | { | |
163 | while (*s != 0 && *s != ':' && !isspace(*s)) s++; | |
164 | linekeylength = s - buffer; | |
165 | } | |
166 | ||
167 | /* The matching test depends on which kind of lsearch we are doing */ | |
168 | ||
169 | switch(type) | |
170 | { | |
171 | /* A plain lsearch treats each key as a literal */ | |
172 | ||
173 | case LSEARCH_PLAIN: | |
174 | if (linekeylength != length || strncmpic(buffer, keystring, length) != 0) | |
175 | continue; | |
176 | break; /* Key matched */ | |
177 | ||
178 | /* A wild lsearch treats each key as a possible wildcarded string; no | |
179 | expansion is done for nwildlsearch. */ | |
180 | ||
181 | case LSEARCH_WILD: | |
182 | case LSEARCH_NWILD: | |
183 | { | |
184 | int rc; | |
185 | int save = buffer[linekeylength]; | |
186 | uschar *list = buffer; | |
187 | buffer[linekeylength] = 0; | |
188 | rc = match_isinlist(keystring, | |
189 | &list, | |
190 | UCHAR_MAX+1, /* Single-item list */ | |
191 | NULL, /* No anchor */ | |
192 | NULL, /* No caching */ | |
193 | MCL_STRING + ((type == LSEARCH_WILD)? 0:MCL_NOEXPAND), | |
194 | TRUE, /* Caseless */ | |
195 | NULL); | |
196 | buffer[linekeylength] = save; | |
197 | if (rc == FAIL) continue; | |
198 | if (rc == DEFER) return DEFER; | |
199 | } | |
eba0c039 PH |
200 | |
201 | /* The key has matched. If the search involved a regular expression, it | |
202 | might have caused numerical variables to be set. However, their values will | |
203 | be in the wrong storage pool for external use. Copying them to the standard | |
204 | pool is not feasible because of the caching of lookup results - a repeated | |
205 | lookup will not match the regular expression again. Therefore, we flatten | |
206 | all numeric variables at this point. */ | |
207 | ||
208 | expand_nmax = -1; | |
209 | break; | |
0756eb3c PH |
210 | |
211 | /* Compare an ip address against a list of network/ip addresses. We have to | |
212 | allow for the "*" case specially. */ | |
213 | ||
214 | case LSEARCH_IP: | |
215 | if (linekeylength == 1 && buffer[0] == '*') | |
216 | { | |
217 | if (length != 1 || keystring[0] != '*') continue; | |
218 | } | |
219 | else if (length == 1 && keystring[0] == '*') continue; | |
220 | else | |
221 | { | |
222 | int maskoffset; | |
223 | int save = buffer[linekeylength]; | |
224 | buffer[linekeylength] = 0; | |
a5a28604 | 225 | if (string_is_ip_address(buffer, &maskoffset) == 0 || |
0756eb3c PH |
226 | !host_is_in_net(keystring, buffer, maskoffset)) continue; |
227 | buffer[linekeylength] = save; | |
228 | } | |
229 | break; /* Key matched */ | |
230 | } | |
231 | ||
232 | /* The key has matched. Skip spaces after the key, and allow an optional | |
233 | colon after the spaces. This is an odd specification, but it's for | |
234 | compatibility. */ | |
235 | ||
236 | while (isspace((uschar)*s)) s++; | |
237 | if (*s == ':') | |
238 | { | |
239 | s++; | |
240 | while (isspace((uschar)*s)) s++; | |
241 | } | |
242 | ||
243 | /* Reset dynamic store, if we need to, and revert to the search pool */ | |
244 | ||
245 | if (reset_point != NULL) | |
246 | { | |
247 | store_reset(reset_point); | |
248 | store_pool = old_pool; | |
249 | } | |
250 | ||
251 | /* Now we want to build the result string to contain the data. There can be | |
252 | two kinds of continuation: (a) the physical line may not all have fitted into | |
253 | the buffer, and (b) there may be logical continuation lines, for which we | |
254 | must convert all leading white space into a single blank. | |
255 | ||
256 | Initialize, and copy the first segment of data. */ | |
257 | ||
258 | size = 100; | |
259 | ptr = 0; | |
260 | yield = store_get(size); | |
261 | if (*s != 0) | |
262 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); | |
263 | ||
264 | /* Now handle continuations */ | |
265 | ||
266 | for (last_was_eol = this_is_eol; | |
267 | Ufgets(buffer, sizeof(buffer), f) != NULL; | |
268 | last_was_eol = this_is_eol) | |
269 | { | |
270 | s = buffer; | |
271 | p = Ustrlen(buffer); | |
272 | this_is_eol = p > 0 && buffer[p-1] == '\n'; | |
273 | ||
274 | /* Remove trailing white space from a physical line end */ | |
275 | ||
276 | if (this_is_eol) | |
277 | { | |
278 | while (p > 0 && isspace((uschar)buffer[p-1])) p--; | |
279 | buffer[p] = 0; | |
280 | } | |
281 | ||
282 | /* If this is not a physical line continuation, skip it entirely if it's | |
283 | empty or starts with #. Otherwise, break the loop if it doesn't start with | |
284 | white space. Otherwise, replace leading white space with a single blank. */ | |
285 | ||
286 | if (last_was_eol) | |
287 | { | |
288 | if (buffer[0] == 0 || buffer[0] == '#') continue; | |
289 | if (!isspace((uschar)buffer[0])) break; | |
290 | while (isspace((uschar)*s)) s++; | |
291 | *(--s) = ' '; | |
292 | } | |
293 | ||
294 | /* Join a physical or logical line continuation onto the result string. */ | |
295 | ||
296 | yield = string_cat(yield, &size, &ptr, s, Ustrlen(s)); | |
297 | } | |
298 | ||
299 | yield[ptr] = 0; | |
300 | store_reset(yield + ptr + 1); | |
301 | *result = yield; | |
302 | return OK; | |
303 | } | |
304 | ||
305 | /* Reset dynamic store, if we need to */ | |
306 | ||
307 | if (reset_point != NULL) | |
308 | { | |
309 | store_reset(reset_point); | |
310 | store_pool = old_pool; | |
311 | } | |
312 | ||
313 | return FAIL; | |
314 | } | |
315 | ||
316 | ||
317 | /************************************************* | |
318 | * Find entry point for lsearch * | |
319 | *************************************************/ | |
320 | ||
321 | /* See local README for interface description */ | |
322 | ||
323 | int | |
324 | lsearch_find(void *handle, uschar *filename, uschar *keystring, int length, | |
325 | uschar **result, uschar **errmsg, BOOL *do_cache) | |
326 | { | |
327 | do_cache = do_cache; /* Keep picky compilers happy */ | |
328 | return internal_lsearch_find(handle, filename, keystring, length, result, | |
329 | errmsg, LSEARCH_PLAIN); | |
330 | } | |
331 | ||
332 | ||
333 | ||
334 | /************************************************* | |
335 | * Find entry point for wildlsearch * | |
336 | *************************************************/ | |
337 | ||
338 | /* See local README for interface description */ | |
339 | ||
340 | int | |
341 | wildlsearch_find(void *handle, uschar *filename, uschar *keystring, int length, | |
342 | uschar **result, uschar **errmsg, BOOL *do_cache) | |
343 | { | |
344 | do_cache = do_cache; /* Keep picky compilers happy */ | |
345 | return internal_lsearch_find(handle, filename, keystring, length, result, | |
346 | errmsg, LSEARCH_WILD); | |
347 | } | |
348 | ||
349 | ||
350 | ||
351 | /************************************************* | |
352 | * Find entry point for nwildlsearch * | |
353 | *************************************************/ | |
354 | ||
355 | /* See local README for interface description */ | |
356 | ||
357 | int | |
358 | nwildlsearch_find(void *handle, uschar *filename, uschar *keystring, int length, | |
359 | uschar **result, uschar **errmsg, BOOL *do_cache) | |
360 | { | |
361 | do_cache = do_cache; /* Keep picky compilers happy */ | |
362 | return internal_lsearch_find(handle, filename, keystring, length, result, | |
363 | errmsg, LSEARCH_NWILD); | |
364 | } | |
365 | ||
366 | ||
367 | ||
368 | ||
369 | /************************************************* | |
370 | * Find entry point for iplsearch * | |
371 | *************************************************/ | |
372 | ||
373 | /* See local README for interface description */ | |
374 | ||
375 | int | |
376 | iplsearch_find(void *handle, uschar *filename, uschar *keystring, int length, | |
377 | uschar **result, uschar **errmsg, BOOL *do_cache) | |
378 | { | |
379 | do_cache = do_cache; /* Keep picky compilers happy */ | |
380 | if ((length == 1 && keystring[0] == '*') || | |
7e66e54d | 381 | string_is_ip_address(keystring, NULL) != 0) |
0756eb3c PH |
382 | { |
383 | return internal_lsearch_find(handle, filename, keystring, length, result, | |
384 | errmsg, LSEARCH_IP); | |
385 | } | |
386 | else | |
387 | { | |
388 | *errmsg = string_sprintf("\"%s\" is not a valid iplsearch key (an IP " | |
389 | "address, with optional CIDR mask, is wanted): " | |
390 | "in a host list, use net-iplsearch as the search type", keystring); | |
391 | return DEFER; | |
392 | } | |
393 | } | |
394 | ||
395 | ||
396 | ||
397 | ||
398 | /************************************************* | |
399 | * Close entry point * | |
400 | *************************************************/ | |
401 | ||
402 | /* See local README for interface description */ | |
403 | ||
404 | void | |
405 | lsearch_close(void *handle) | |
406 | { | |
f1e894f3 | 407 | (void)fclose((FILE *)handle); |
0756eb3c PH |
408 | } |
409 | ||
410 | /* End of lookups/lsearch.c */ |