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d7d7b7b9 | 1 | /* $Cambridge: exim/src/src/lookups/pgsql.c,v 1.4 2006/02/07 11:19:01 ph10 Exp $ */ |
0756eb3c PH |
2 | |
3 | /************************************************* | |
4 | * Exim - an Internet mail transport agent * | |
5 | *************************************************/ | |
6 | ||
d7d7b7b9 | 7 | /* Copyright (c) University of Cambridge 1995 - 2006 */ |
0756eb3c PH |
8 | /* See the file NOTICE for conditions of use and distribution. */ |
9 | ||
10 | /* Thanks to Petr Cech for contributing the original code for these | |
11 | functions. Thanks to Joachim Wieland for the initial patch for the Unix domain | |
12 | socket extension. */ | |
13 | ||
14 | #include "../exim.h" | |
15 | #include "lf_functions.h" | |
16 | #include "pgsql.h" /* The local header */ | |
17 | ||
18 | /* We can't just compile this code and allow the library mechanism to omit the | |
19 | functions if they are not wanted, because we need to have the PGSQL header | |
20 | available for compiling. Therefore, compile these functions only if | |
21 | LOOKUP_PGSQL is defined. However, some compilers don't like compiling empty | |
22 | modules, so keep them happy with a dummy when skipping the rest. Make it | |
23 | reference itself to stop picky compilers complaining that it is unused, and put | |
24 | in a dummy argument to stop even pickier compilers complaining about infinite | |
25 | loops. */ | |
26 | ||
27 | #ifndef LOOKUP_PGSQL | |
28 | static void dummy(int x) { dummy(x-1); } | |
29 | #else | |
30 | ||
31 | ||
32 | #include <libpq-fe.h> /* The system header */ | |
33 | ||
34 | /* Structure and anchor for caching connections. */ | |
35 | ||
36 | typedef struct pgsql_connection { | |
37 | struct pgsql_connection *next; | |
38 | uschar *server; | |
39 | PGconn *handle; | |
40 | } pgsql_connection; | |
41 | ||
42 | static pgsql_connection *pgsql_connections = NULL; | |
43 | ||
44 | ||
45 | ||
46 | /************************************************* | |
47 | * Open entry point * | |
48 | *************************************************/ | |
49 | ||
50 | /* See local README for interface description. */ | |
51 | ||
52 | void * | |
53 | pgsql_open(uschar *filename, uschar **errmsg) | |
54 | { | |
55 | return (void *)(1); /* Just return something non-null */ | |
56 | } | |
57 | ||
58 | ||
59 | ||
60 | /************************************************* | |
61 | * Tidy entry point * | |
62 | *************************************************/ | |
63 | ||
64 | /* See local README for interface description. */ | |
65 | ||
66 | void | |
67 | pgsql_tidy(void) | |
68 | { | |
69 | pgsql_connection *cn; | |
70 | while ((cn = pgsql_connections) != NULL) | |
71 | { | |
72 | pgsql_connections = cn->next; | |
73 | DEBUG(D_lookup) debug_printf("close PGSQL connection: %s\n", cn->server); | |
74 | PQfinish(cn->handle); | |
75 | } | |
76 | } | |
77 | ||
78 | ||
79 | ||
80 | /************************************************* | |
81 | * Internal search function * | |
82 | *************************************************/ | |
83 | ||
84 | /* This function is called from the find entry point to do the search for a | |
85 | single server. The server string is of the form "server/dbname/user/password". | |
86 | ||
87 | PostgreSQL supports connections through Unix domain sockets. This is usually | |
88 | faster and costs less cpu time than a TCP/IP connection. However it can only be | |
89 | used if the mail server runs on the same machine as the database server. A | |
90 | configuration line for PostgreSQL via Unix domain sockets looks like this: | |
91 | ||
92 | hide pgsql_servers = (/tmp/.s.PGSQL.5432)/db/user/password[:<nextserver>] | |
93 | ||
94 | We enclose the path name in parentheses so that its slashes aren't visually | |
95 | confused with the delimeters for the other pgsql_server settings. | |
96 | ||
97 | For TCP/IP connections, the server is a host name and optional port (with a | |
98 | colon separator). | |
99 | ||
100 | NOTE: | |
101 | 1) All three '/' must be present. | |
102 | 2) If host is omitted the local unix socket is used. | |
103 | ||
104 | Arguments: | |
105 | query the query string | |
106 | server the server string; this is in dynamic memory and can be updated | |
107 | resultptr where to store the result | |
108 | errmsg where to point an error message | |
109 | defer_break TRUE if no more servers are to be tried after DEFER | |
110 | do_cache set FALSE if data is changed | |
111 | ||
112 | Returns: OK, FAIL, or DEFER | |
113 | */ | |
114 | ||
115 | static int | |
116 | perform_pgsql_search(uschar *query, uschar *server, uschar **resultptr, | |
117 | uschar **errmsg, BOOL *defer_break, BOOL *do_cache) | |
118 | { | |
119 | PGconn *pg_conn = NULL; | |
120 | PGresult *pg_result = NULL; | |
121 | ||
122 | int i; | |
123 | int ssize = 0; | |
124 | int offset = 0; | |
125 | int yield = DEFER; | |
126 | unsigned int num_fields, num_tuples; | |
127 | uschar *result = NULL; | |
128 | pgsql_connection *cn; | |
129 | uschar *server_copy = NULL; | |
130 | uschar *sdata[3]; | |
131 | ||
132 | /* Disaggregate the parameters from the server argument. The order is host or | |
133 | path, database, user, password. We can write to the string, since it is in a | |
134 | nextinlist temporary buffer. The copy of the string that is used for caching | |
135 | has the password removed. This copy is also used for debugging output. */ | |
136 | ||
137 | for (i = 2; i >= 0; i--) | |
138 | { | |
139 | uschar *pp = Ustrrchr(server, '/'); | |
140 | if (pp == NULL) | |
141 | { | |
142 | *errmsg = string_sprintf("incomplete pgSQL server data: %s", | |
143 | (i == 2)? server : server_copy); | |
144 | *defer_break = TRUE; | |
145 | return DEFER; | |
146 | } | |
147 | *pp++ = 0; | |
148 | sdata[i] = pp; | |
149 | if (i == 2) server_copy = string_copy(server); /* sans password */ | |
150 | } | |
151 | ||
152 | /* The total server string has now been truncated so that what is left at the | |
153 | start is the identification of the server (host or path). See if we have a | |
154 | cached connection to the server. */ | |
155 | ||
156 | for (cn = pgsql_connections; cn != NULL; cn = cn->next) | |
157 | { | |
158 | if (Ustrcmp(cn->server, server_copy) == 0) | |
159 | { | |
160 | pg_conn = cn->handle; | |
161 | break; | |
162 | } | |
163 | } | |
164 | ||
165 | /* If there is no cached connection, we must set one up. */ | |
166 | ||
167 | if (cn == NULL) | |
168 | { | |
169 | uschar *port = US""; | |
170 | ||
171 | /* For a Unix domain socket connection, the path is in parentheses */ | |
172 | ||
173 | if (*server == '(') | |
174 | { | |
175 | uschar *last_slash, *last_dot, *p; | |
176 | ||
177 | p = ++server; | |
178 | while (*p != 0 && *p != ')') p++; | |
179 | *p = 0; | |
180 | ||
181 | last_slash = Ustrrchr(server, '/'); | |
182 | last_dot = Ustrrchr(server, '.'); | |
183 | ||
184 | DEBUG(D_lookup) debug_printf("PGSQL new connection: socket=%s " | |
185 | "database=%s user=%s\n", server, sdata[0], sdata[1]); | |
186 | ||
187 | /* A valid socket name looks like this: /var/run/postgresql/.s.PGSQL.5432 | |
188 | We have to call PQsetdbLogin with '/var/run/postgresql' as the hostname | |
189 | argument and put '5432' into the port variable. */ | |
190 | ||
191 | if (last_slash == NULL || last_dot == NULL) | |
192 | { | |
193 | *errmsg = string_sprintf("PGSQL invalid filename for socket: %s", | |
194 | server); | |
195 | *defer_break = TRUE; | |
196 | return DEFER; | |
197 | } | |
198 | ||
199 | /* Terminate the path name and set up the port: we'll have something like | |
200 | server = "/var/run/postgresql" and port = "5432". */ | |
201 | ||
202 | *last_slash = 0; | |
203 | port = last_dot + 1; | |
204 | } | |
205 | ||
206 | /* Host connection; sort out the port */ | |
207 | ||
208 | else | |
209 | { | |
210 | uschar *p; | |
211 | if ((p = Ustrchr(server, ':')) != NULL) | |
212 | { | |
213 | *p++ = 0; | |
214 | port = p; | |
215 | } | |
216 | ||
217 | if (Ustrchr(server, '/') != NULL) | |
218 | { | |
219 | *errmsg = string_sprintf("unexpected slash in pgSQL server hostname: %s", | |
220 | server); | |
221 | *defer_break = TRUE; | |
222 | return DEFER; | |
223 | } | |
224 | ||
225 | DEBUG(D_lookup) debug_printf("PGSQL new connection: host=%s port=%s " | |
226 | "database=%s user=%s\n", server, port, sdata[0], sdata[1]); | |
227 | } | |
228 | ||
229 | /* If the database is the empty string, set it NULL - the query must then | |
230 | define it. */ | |
231 | ||
232 | if (sdata[0][0] == 0) sdata[0] = NULL; | |
233 | ||
234 | /* Get store for a new handle, initialize it, and connect to the server */ | |
235 | ||
236 | pg_conn=PQsetdbLogin( | |
237 | /* host port options tty database user passwd */ | |
238 | CS server, CS port, NULL, NULL, CS sdata[0], CS sdata[1], CS sdata[2]); | |
239 | ||
240 | if(PQstatus(pg_conn) == CONNECTION_BAD) | |
241 | { | |
242 | store_reset(server_copy); | |
243 | *errmsg = string_sprintf("PGSQL connection failed: %s", | |
244 | PQerrorMessage(pg_conn)); | |
245 | PQfinish(pg_conn); | |
246 | *defer_break = FALSE; | |
247 | goto PGSQL_EXIT; | |
248 | } | |
249 | ||
250 | /* Add the connection to the cache */ | |
251 | ||
252 | cn = store_get(sizeof(pgsql_connection)); | |
253 | cn->server = server_copy; | |
254 | cn->handle = pg_conn; | |
255 | cn->next = pgsql_connections; | |
256 | pgsql_connections = cn; | |
257 | } | |
258 | ||
259 | /* Else use a previously cached connection */ | |
260 | ||
261 | else | |
262 | { | |
263 | DEBUG(D_lookup) debug_printf("PGSQL using cached connection for %s\n", | |
264 | server_copy); | |
265 | } | |
266 | ||
267 | /* Run the query */ | |
268 | ||
269 | pg_result = PQexec(pg_conn, CS query); | |
270 | switch(PQresultStatus(pg_result)) | |
271 | { | |
272 | case PGRES_EMPTY_QUERY: | |
273 | case PGRES_COMMAND_OK: | |
274 | /* The command was successful but did not return any data since it was | |
275 | * not SELECT but either an INSERT, UPDATE or DELETE statement. Tell the | |
276 | * high level code to not cache this query, and clean the current cache for | |
277 | * this handle by setting *do_cache FALSE. */ | |
278 | result = string_copy(US PQcmdTuples(pg_result)); | |
279 | offset = Ustrlen(result); | |
280 | *do_cache = FALSE; | |
281 | DEBUG(D_lookup) debug_printf("PGSQL: command does not return any data " | |
282 | "but was successful. Rows affected: %s\n", result); | |
283 | ||
284 | case PGRES_TUPLES_OK: | |
285 | break; | |
286 | ||
287 | default: | |
e08c430f | 288 | /* This was the original code: |
0756eb3c PH |
289 | *errmsg = string_sprintf("PGSQL: query failed: %s\n", |
290 | PQresultErrorMessage(pg_result)); | |
e08c430f PH |
291 | This was suggested by a user: |
292 | */ | |
293 | ||
294 | *errmsg = string_sprintf("PGSQL: query failed: %s (%s) (%s)\n", | |
295 | PQresultErrorMessage(pg_result), | |
296 | PQresStatus(PQresultStatus(pg_result)), query); | |
0756eb3c PH |
297 | *defer_break = FALSE; |
298 | goto PGSQL_EXIT; | |
299 | } | |
300 | ||
301 | /* Result is in pg_result. Find the number of fields returned. If this is one, | |
302 | we don't add field names to the data. Otherwise we do. If the query did not | |
303 | return anything we skip the for loop; this also applies to the case | |
304 | PGRES_COMMAND_OK. */ | |
305 | ||
306 | num_fields = PQnfields(pg_result); | |
307 | num_tuples = PQntuples(pg_result); | |
308 | ||
309 | /* Get the fields and construct the result string. If there is more than one | |
310 | row, we insert '\n' between them. */ | |
311 | ||
312 | for (i = 0; i < num_tuples; i++) | |
313 | { | |
314 | if (result != NULL) | |
315 | result = string_cat(result, &ssize, &offset, US"\n", 1); | |
316 | ||
317 | if (num_fields == 1) | |
318 | { | |
319 | result = string_cat(result, &ssize, &offset, | |
320 | US PQgetvalue(pg_result, i, 0), PQgetlength(pg_result, i, 0)); | |
321 | } | |
322 | ||
323 | else | |
324 | { | |
325 | int j; | |
326 | for (j = 0; j < num_fields; j++) | |
327 | { | |
328 | uschar *tmp = US PQgetvalue(pg_result, i, j); | |
329 | result = lf_quote(US PQfname(pg_result, j), tmp, Ustrlen(tmp), result, | |
330 | &ssize, &offset); | |
331 | } | |
332 | } | |
333 | } | |
334 | ||
335 | /* If result is NULL then no data has been found and so we return FAIL. | |
336 | Otherwise, we must terminate the string which has been built; string_cat() | |
337 | always leaves enough room for a terminating zero. */ | |
338 | ||
339 | if (result == NULL) | |
340 | { | |
341 | yield = FAIL; | |
342 | *errmsg = US"PGSQL: no data found"; | |
343 | } | |
344 | else | |
345 | { | |
346 | result[offset] = 0; | |
347 | store_reset(result + offset + 1); | |
348 | } | |
349 | ||
350 | /* Get here by goto from various error checks. */ | |
351 | ||
352 | PGSQL_EXIT: | |
353 | ||
354 | /* Free store for any result that was got; don't close the connection, as | |
355 | it is cached. */ | |
356 | ||
357 | if (pg_result != NULL) PQclear(pg_result); | |
358 | ||
359 | /* Non-NULL result indicates a sucessful result */ | |
360 | ||
361 | if (result != NULL) | |
362 | { | |
363 | *resultptr = result; | |
364 | return OK; | |
365 | } | |
366 | else | |
367 | { | |
368 | DEBUG(D_lookup) debug_printf("%s\n", *errmsg); | |
369 | return yield; /* FAIL or DEFER */ | |
370 | } | |
371 | } | |
372 | ||
373 | ||
374 | ||
375 | ||
376 | /************************************************* | |
377 | * Find entry point * | |
378 | *************************************************/ | |
379 | ||
380 | /* See local README for interface description. The handle and filename | |
381 | arguments are not used. Loop through a list of servers while the query is | |
382 | deferred with a retryable error. */ | |
383 | ||
384 | int | |
385 | pgsql_find(void *handle, uschar *filename, uschar *query, int length, | |
386 | uschar **result, uschar **errmsg, BOOL *do_cache) | |
387 | { | |
388 | int sep = 0; | |
389 | uschar *server; | |
390 | uschar *list = pgsql_servers; | |
391 | uschar buffer[512]; | |
392 | ||
393 | DEBUG(D_lookup) debug_printf("PGSQL query: %s\n", query); | |
394 | ||
395 | while ((server = string_nextinlist(&list, &sep, buffer, sizeof(buffer))) | |
396 | != NULL) | |
397 | { | |
398 | BOOL defer_break; | |
399 | int rc = perform_pgsql_search(query, server, result, errmsg, &defer_break, | |
400 | do_cache); | |
401 | if (rc != DEFER || defer_break) return rc; | |
402 | } | |
403 | ||
404 | if (pgsql_servers == NULL) | |
405 | *errmsg = US"no PGSQL servers defined (pgsql_servers option)"; | |
406 | ||
407 | return DEFER; | |
408 | } | |
409 | ||
410 | ||
411 | ||
412 | /************************************************* | |
413 | * Quote entry point * | |
414 | *************************************************/ | |
415 | ||
416 | /* The characters that always need to be quoted (with backslash) are newline, | |
417 | tab, carriage return, backspace, backslash itself, and the quote characters. | |
418 | Percent and underscore are only special in contexts where they can be wild | |
419 | cards, and this isn't usually the case for data inserted from messages, since | |
420 | that isn't likely to be treated as a pattern of any kind. However, pgsql seems | |
421 | to allow escaping "on spec". If you use something like "where id="ab\%cd" it | |
422 | does treat the string as "ab%cd". So we can safely quote percent and | |
423 | underscore. [This is different to MySQL, where you can't do this.] | |
424 | ||
425 | Arguments: | |
426 | s the string to be quoted | |
427 | opt additional option text or NULL if none | |
428 | ||
429 | Returns: the processed string or NULL for a bad option | |
430 | */ | |
431 | ||
432 | uschar * | |
433 | pgsql_quote(uschar *s, uschar *opt) | |
434 | { | |
435 | register int c; | |
436 | int count = 0; | |
437 | uschar *t = s; | |
438 | uschar *quoted; | |
439 | ||
440 | if (opt != NULL) return NULL; /* No options recognized */ | |
441 | ||
442 | while ((c = *t++) != 0) | |
443 | if (Ustrchr("\n\t\r\b\'\"\\%_", c) != NULL) count++; | |
444 | ||
445 | if (count == 0) return s; | |
446 | t = quoted = store_get(Ustrlen(s) + count + 1); | |
447 | ||
448 | while ((c = *s++) != 0) | |
449 | { | |
450 | if (Ustrchr("\n\t\r\b\'\"\\%_", c) != NULL) | |
451 | { | |
452 | *t++ = '\\'; | |
453 | switch(c) | |
454 | { | |
455 | case '\n': *t++ = 'n'; | |
456 | break; | |
457 | case '\t': *t++ = 't'; | |
458 | break; | |
459 | case '\r': *t++ = 'r'; | |
460 | break; | |
461 | case '\b': *t++ = 'b'; | |
462 | break; | |
463 | default: *t++ = c; | |
464 | break; | |
465 | } | |
466 | } | |
467 | else *t++ = c; | |
468 | } | |
469 | ||
470 | *t = 0; | |
471 | return quoted; | |
472 | } | |
473 | ||
474 | #endif /* PGSQL_LOOKUP */ | |
475 | ||
476 | /* End of lookups/pgsql.c */ |