Commit | Line | Data |
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9bdd29ad TL |
1 | /************************************************* |
2 | * Exim - an Internet mail transport agent * | |
3 | *************************************************/ | |
4 | ||
8d6d5106 | 5 | /* Copyright (c) University of Cambridge 1995 - 2015 */ |
9bdd29ad TL |
6 | /* See the file NOTICE for conditions of use and distribution. */ |
7 | ||
8 | #include "../exim.h" | |
9 | ||
de78e2d5 | 10 | #ifdef LOOKUP_REDIS |
9bdd29ad TL |
11 | |
12 | #include "lf_functions.h" | |
13 | ||
14 | #include <hiredis/hiredis.h> | |
15 | ||
2d8d625b JH |
16 | #ifndef nele |
17 | # define nele(arr) (sizeof(arr) / sizeof(*arr)) | |
18 | #endif | |
19 | ||
9bdd29ad TL |
20 | /* Structure and anchor for caching connections. */ |
21 | typedef struct redis_connection { | |
2d8d625b JH |
22 | struct redis_connection *next; |
23 | uschar *server; | |
24 | redisContext *handle; | |
9bdd29ad TL |
25 | } redis_connection; |
26 | ||
27 | static redis_connection *redis_connections = NULL; | |
28 | ||
2d8d625b | 29 | |
9bdd29ad TL |
30 | static void * |
31 | redis_open(uschar *filename, uschar **errmsg) | |
32 | { | |
2d8d625b | 33 | return (void *)(1); |
9bdd29ad TL |
34 | } |
35 | ||
2d8d625b | 36 | |
9bdd29ad TL |
37 | void |
38 | redis_tidy(void) | |
39 | { | |
2d8d625b JH |
40 | redis_connection *cn; |
41 | ||
42 | /* XXX: Not sure how often this is called! | |
43 | Guess its called after every lookup which probably would mean to just | |
44 | not use the _tidy() function at all and leave with exim exiting to | |
45 | GC connections! */ | |
46 | ||
47 | while ((cn = redis_connections)) | |
48 | { | |
49 | redis_connections = cn->next; | |
50 | DEBUG(D_lookup) debug_printf("close REDIS connection: %s\n", cn->server); | |
51 | redisFree(cn->handle); | |
52 | } | |
9bdd29ad TL |
53 | } |
54 | ||
2d8d625b | 55 | |
9bdd29ad | 56 | /* This function is called from the find entry point to do the search for a |
2d8d625b JH |
57 | single server. |
58 | ||
59 | Arguments: | |
60 | query the query string | |
61 | server the server string | |
62 | resultptr where to store the result | |
63 | errmsg where to point an error message | |
64 | defer_break TRUE if no more servers are to be tried after DEFER | |
65 | do_cache set false if data is changed | |
66 | ||
67 | The server string is of the form "host/dbnumber/password". The host can be | |
68 | host:port. This string is in a nextinlist temporary buffer, so can be | |
69 | overwritten. | |
70 | ||
71 | Returns: OK, FAIL, or DEFER | |
72 | */ | |
73 | ||
9bdd29ad | 74 | static int |
2d8d625b | 75 | perform_redis_search(const uschar *command, uschar *server, uschar **resultptr, |
14b3c5bc | 76 | uschar **errmsg, BOOL *defer_break, uint *do_cache) |
9bdd29ad | 77 | { |
2d8d625b JH |
78 | redisContext *redis_handle = NULL; /* Keep compilers happy */ |
79 | redisReply *redis_reply = NULL; | |
80 | redisReply *entry = NULL; | |
81 | redisReply *tentry = NULL; | |
82 | redis_connection *cn; | |
83 | int ssize = 0; | |
84 | int offset = 0; | |
85 | int yield = DEFER; | |
86 | int i, j; | |
87 | uschar *result = NULL; | |
88 | uschar *server_copy = NULL; | |
89 | uschar *tmp, *ttmp; | |
90 | uschar *sdata[3]; | |
91 | ||
92 | /* Disaggregate the parameters from the server argument. | |
93 | The order is host:port(socket) | |
94 | We can write to the string, since it is in a nextinlist temporary buffer. | |
95 | This copy is also used for debugging output. */ | |
96 | ||
97 | memset(sdata, 0, sizeof(sdata)) /* Set all to NULL */; | |
98 | for (i = 2; i > 0; i--) | |
99 | { | |
100 | uschar *pp = Ustrrchr(server, '/'); | |
101 | ||
102 | if (!pp) | |
103 | { | |
104 | *errmsg = string_sprintf("incomplete Redis server data: %s", | |
105 | i == 2 ? server : server_copy); | |
106 | *defer_break = TRUE; | |
107 | return DEFER; | |
108 | } | |
109 | *pp++ = 0; | |
110 | sdata[i] = pp; | |
111 | if (i == 2) server_copy = string_copy(server); /* sans password */ | |
112 | } | |
113 | sdata[0] = server; /* What's left at the start */ | |
114 | ||
115 | /* If the database or password is an empty string, set it NULL */ | |
116 | if (sdata[1][0] == 0) sdata[1] = NULL; | |
117 | if (sdata[2][0] == 0) sdata[2] = NULL; | |
118 | ||
119 | /* See if we have a cached connection to the server */ | |
120 | ||
de78e2d5 | 121 | for (cn = redis_connections; cn; cn = cn->next) |
2d8d625b JH |
122 | if (Ustrcmp(cn->server, server_copy) == 0) |
123 | { | |
124 | redis_handle = cn->handle; | |
125 | break; | |
126 | } | |
127 | ||
128 | if (!cn) | |
129 | { | |
130 | uschar *p; | |
131 | uschar *socket = NULL; | |
132 | int port = 0; | |
133 | /* int redis_err = REDIS_OK; */ | |
134 | ||
135 | if ((p = Ustrchr(sdata[0], '('))) | |
136 | { | |
137 | *p++ = 0; | |
138 | socket = p; | |
139 | while (*p != 0 && *p != ')') p++; | |
140 | *p = 0; | |
141 | } | |
142 | ||
143 | if ((p = Ustrchr(sdata[0], ':'))) | |
144 | { | |
145 | *p++ = 0; | |
146 | port = Uatoi(p); | |
147 | } | |
148 | else | |
149 | port = Uatoi("6379"); | |
150 | ||
151 | if (Ustrchr(server, '/')) | |
152 | { | |
153 | *errmsg = string_sprintf("unexpected slash in Redis server hostname: %s", | |
154 | sdata[0]); | |
155 | *defer_break = TRUE; | |
156 | return DEFER; | |
157 | } | |
158 | ||
159 | DEBUG(D_lookup) | |
160 | debug_printf("REDIS new connection: host=%s port=%d socket=%s database=%s\n", | |
161 | sdata[0], port, socket, sdata[1]); | |
162 | ||
163 | /* Get store for a new handle, initialize it, and connect to the server */ | |
164 | /* XXX: Use timeouts ? */ | |
165 | redis_handle = | |
166 | socket ? redisConnectUnix(CCS socket) : redisConnect(CCS server, port); | |
167 | if (!redis_handle) | |
168 | { | |
169 | *errmsg = string_sprintf("REDIS connection failed"); | |
170 | *defer_break = FALSE; | |
171 | goto REDIS_EXIT; | |
172 | } | |
173 | ||
174 | /* Add the connection to the cache */ | |
175 | cn = store_get(sizeof(redis_connection)); | |
176 | cn->server = server_copy; | |
177 | cn->handle = redis_handle; | |
178 | cn->next = redis_connections; | |
179 | redis_connections = cn; | |
180 | } | |
181 | else | |
182 | { | |
183 | DEBUG(D_lookup) | |
184 | debug_printf("REDIS using cached connection for %s\n", server_copy); | |
185 | } | |
186 | ||
187 | /* Authenticate if there is a password */ | |
188 | if(sdata[2]) | |
189 | if (!(redis_reply = redisCommand(redis_handle, "AUTH %s", sdata[2]))) | |
190 | { | |
191 | *errmsg = string_sprintf("REDIS Authentication failed: %s\n", redis_handle->errstr); | |
192 | *defer_break = FALSE; | |
193 | goto REDIS_EXIT; | |
194 | } | |
195 | ||
196 | /* Select the database if there is a dbnumber passed */ | |
197 | if(sdata[1]) | |
198 | { | |
199 | if (!(redis_reply = redisCommand(redis_handle, "SELECT %s", sdata[1]))) | |
200 | { | |
201 | *errmsg = string_sprintf("REDIS: Selecting database=%s failed: %s\n", sdata[1], redis_handle->errstr); | |
202 | *defer_break = FALSE; | |
203 | goto REDIS_EXIT; | |
204 | } | |
205 | DEBUG(D_lookup) debug_printf("REDIS: Selecting database=%s\n", sdata[1]); | |
206 | } | |
207 | ||
208 | /* split string on whitespace into argv */ | |
209 | { | |
210 | uschar * argv[32]; | |
211 | int i; | |
42653575 | 212 | const uschar * s = command; |
2d8d625b JH |
213 | int siz, ptr; |
214 | uschar c; | |
215 | ||
216 | while (isspace(*s)) s++; | |
217 | ||
42653575 | 218 | for (i = 0; *s && i < nele(argv); i++) |
2d8d625b JH |
219 | { |
220 | for (argv[i] = NULL, siz = ptr = 0; (c = *s) && !isspace(c); s++) | |
221 | if (c != '\\' || *++s) /* backslash protects next char */ | |
222 | argv[i] = string_cat(argv[i], &siz, &ptr, s, 1); | |
223 | *(argv[i]+ptr) = '\0'; | |
224 | DEBUG(D_lookup) debug_printf("REDIS: argv[%d] '%s'\n", i, argv[i]); | |
225 | while (isspace(*s)) s++; | |
226 | } | |
227 | ||
228 | /* Run the command. We use the argv form rather than plain as that parses | |
229 | into args by whitespace yet has no escaping mechanism. */ | |
230 | ||
231 | redis_reply = redisCommandArgv(redis_handle, i, (const char **) argv, NULL); | |
232 | if (!redis_reply) | |
233 | { | |
234 | *errmsg = string_sprintf("REDIS: query failed: %s\n", redis_handle->errstr); | |
235 | *defer_break = FALSE; | |
236 | goto REDIS_EXIT; | |
237 | } | |
238 | } | |
239 | ||
240 | switch (redis_reply->type) | |
241 | { | |
242 | case REDIS_REPLY_ERROR: | |
243 | *errmsg = string_sprintf("REDIS: lookup result failed: %s\n", redis_reply->str); | |
244 | *defer_break = FALSE; | |
245 | *do_cache = 0; | |
246 | goto REDIS_EXIT; | |
247 | /* NOTREACHED */ | |
248 | ||
249 | case REDIS_REPLY_NIL: | |
250 | DEBUG(D_lookup) | |
251 | debug_printf("REDIS: query was not one that returned any data\n"); | |
252 | result = string_sprintf(""); | |
253 | *do_cache = 0; | |
254 | goto REDIS_EXIT; | |
255 | /* NOTREACHED */ | |
256 | ||
257 | case REDIS_REPLY_INTEGER: | |
258 | ttmp = (redis_reply->integer != 0) ? US"true" : US"false"; | |
259 | result = string_cat(result, &ssize, &offset, US ttmp, Ustrlen(ttmp)); | |
260 | break; | |
261 | ||
262 | case REDIS_REPLY_STRING: | |
263 | case REDIS_REPLY_STATUS: | |
264 | result = string_cat(result, &ssize, &offset, | |
265 | US redis_reply->str, redis_reply->len); | |
266 | break; | |
267 | ||
268 | case REDIS_REPLY_ARRAY: | |
269 | ||
270 | /* NOTE: For now support 1 nested array result. If needed a limitless | |
271 | result can be parsed */ | |
272 | ||
273 | for (i = 0; i < redis_reply->elements; i++) | |
274 | { | |
275 | entry = redis_reply->element[i]; | |
276 | ||
277 | if (result) | |
278 | result = string_cat(result, &ssize, &offset, US"\n", 1); | |
279 | ||
280 | switch (entry->type) | |
281 | { | |
282 | case REDIS_REPLY_INTEGER: | |
283 | tmp = string_sprintf("%d", entry->integer); | |
284 | result = string_cat(result, &ssize, &offset, US tmp, Ustrlen(tmp)); | |
285 | break; | |
286 | case REDIS_REPLY_STRING: | |
287 | result = string_cat(result, &ssize, &offset, | |
288 | US entry->str, entry->len); | |
289 | break; | |
290 | case REDIS_REPLY_ARRAY: | |
291 | for (j = 0; j < entry->elements; j++) | |
292 | { | |
293 | tentry = entry->element[j]; | |
294 | ||
295 | if (result) | |
296 | result = string_cat(result, &ssize, &offset, US"\n", 1); | |
297 | ||
298 | switch (tentry->type) | |
299 | { | |
300 | case REDIS_REPLY_INTEGER: | |
301 | ttmp = string_sprintf("%d", tentry->integer); | |
302 | result = string_cat(result, &ssize, &offset, | |
303 | US ttmp, Ustrlen(ttmp)); | |
304 | break; | |
305 | case REDIS_REPLY_STRING: | |
306 | result = string_cat(result, &ssize, &offset, | |
307 | US tentry->str, tentry->len); | |
308 | break; | |
309 | case REDIS_REPLY_ARRAY: | |
310 | DEBUG(D_lookup) | |
311 | debug_printf("REDIS: result has nesting of arrays which" | |
312 | " is not supported. Ignoring!\n"); | |
313 | break; | |
314 | default: | |
315 | DEBUG(D_lookup) debug_printf( | |
316 | "REDIS: result has unsupported type. Ignoring!\n"); | |
317 | break; | |
318 | } | |
319 | } | |
320 | break; | |
321 | default: | |
322 | DEBUG(D_lookup) debug_printf("REDIS: query returned unsupported type\n"); | |
323 | break; | |
324 | } | |
325 | } | |
326 | break; | |
327 | } | |
328 | ||
329 | ||
330 | if (result) | |
331 | { | |
332 | result[offset] = 0; | |
333 | store_reset(result + offset + 1); | |
334 | } | |
335 | else | |
336 | { | |
337 | yield = FAIL; | |
338 | *errmsg = US"REDIS: no data found"; | |
339 | } | |
340 | ||
341 | REDIS_EXIT: | |
342 | ||
343 | /* Free store for any result that was got; don't close the connection, | |
344 | as it is cached. */ | |
345 | ||
346 | if (redis_reply) freeReplyObject(redis_reply); | |
347 | ||
348 | /* Non-NULL result indicates a sucessful result */ | |
349 | ||
350 | if (result) | |
351 | { | |
352 | *resultptr = result; | |
353 | return OK; | |
354 | } | |
355 | else | |
356 | { | |
357 | DEBUG(D_lookup) debug_printf("%s\n", *errmsg); | |
358 | /* NOTE: Required to close connection since it needs to be reopened */ | |
359 | return yield; /* FAIL or DEFER */ | |
360 | } | |
9bdd29ad TL |
361 | } |
362 | ||
2d8d625b JH |
363 | |
364 | ||
9bdd29ad TL |
365 | /************************************************* |
366 | * Find entry point * | |
367 | *************************************************/ | |
368 | /* | |
369 | * See local README for interface description. The handle and filename | |
370 | * arguments are not used. The code to loop through a list of servers while the | |
371 | * query is deferred with a retryable error is now in a separate function that is | |
372 | * shared with other noSQL lookups. | |
373 | */ | |
374 | ||
375 | static int | |
2d8d625b JH |
376 | redis_find(void *handle __attribute__((unused)), |
377 | uschar *filename __attribute__((unused)), | |
378 | const uschar *command, int length, uschar **result, uschar **errmsg, | |
379 | uint *do_cache) | |
9bdd29ad | 380 | { |
2d8d625b JH |
381 | return lf_sqlperform(US"Redis", US"redis_servers", redis_servers, command, |
382 | result, errmsg, do_cache, perform_redis_search); | |
9bdd29ad TL |
383 | } |
384 | ||
2d8d625b JH |
385 | |
386 | ||
387 | /************************************************* | |
388 | * Quote entry point * | |
389 | *************************************************/ | |
390 | ||
391 | /* Prefix any whitespace, or backslash, with a backslash. | |
392 | This is not a Redis thing but instead to let the argv splitting | |
393 | we do to split on whitespace, yet provide means for getting | |
394 | whitespace into an argument. | |
395 | ||
396 | Arguments: | |
397 | s the string to be quoted | |
398 | opt additional option text or NULL if none | |
399 | ||
400 | Returns: the processed string or NULL for a bad option | |
401 | */ | |
402 | ||
403 | static uschar * | |
404 | redis_quote(uschar *s, uschar *opt) | |
405 | { | |
406 | register int c; | |
407 | int count = 0; | |
408 | uschar *t = s; | |
409 | uschar *quoted; | |
410 | ||
411 | if (opt) return NULL; /* No options recognized */ | |
412 | ||
413 | while ((c = *t++) != 0) | |
414 | if (isspace(c) || c == '\\') count++; | |
415 | ||
416 | if (count == 0) return s; | |
417 | t = quoted = store_get(Ustrlen(s) + count + 1); | |
418 | ||
419 | while ((c = *s++) != 0) | |
420 | { | |
421 | if (isspace(c) || c == '\\') *t++ = '\\'; | |
422 | *t++ = c; | |
423 | } | |
424 | ||
425 | *t = 0; | |
426 | return quoted; | |
427 | } | |
428 | ||
429 | ||
9bdd29ad TL |
430 | /************************************************* |
431 | * Version reporting entry point * | |
432 | *************************************************/ | |
433 | #include "../version.h" | |
434 | ||
435 | void | |
436 | redis_version_report(FILE *f) | |
437 | { | |
2d8d625b | 438 | fprintf(f, "Library version: REDIS: Compile: %d [%d]\n", |
9bdd29ad TL |
439 | HIREDIS_MAJOR, HIREDIS_MINOR); |
440 | #ifdef DYNLOOKUP | |
2d8d625b | 441 | fprintf(f, " Exim version %s\n", EXIM_VERSION_STR); |
9bdd29ad TL |
442 | #endif |
443 | } | |
444 | ||
2d8d625b JH |
445 | |
446 | ||
9bdd29ad TL |
447 | /* These are the lookup_info blocks for this driver */ |
448 | static lookup_info redis_lookup_info = { | |
449 | US"redis", /* lookup name */ | |
450 | lookup_querystyle, /* query-style lookup */ | |
451 | redis_open, /* open function */ | |
452 | NULL, /* no check function */ | |
453 | redis_find, /* find function */ | |
454 | NULL, /* no close function */ | |
455 | redis_tidy, /* tidy function */ | |
2d8d625b | 456 | redis_quote, /* quoting function */ |
9bdd29ad TL |
457 | redis_version_report /* version reporting */ |
458 | }; | |
459 | ||
460 | #ifdef DYNLOOKUP | |
de78e2d5 | 461 | # define redis_lookup_module_info _lookup_module_info |
9bdd29ad TL |
462 | #endif /* DYNLOOKUP */ |
463 | ||
464 | static lookup_info *_lookup_list[] = { &redis_lookup_info }; | |
465 | lookup_module_info redis_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 }; | |
466 | ||
de78e2d5 | 467 | #endif /* LOOKUP_REDIS */ |
9bdd29ad | 468 | /* End of lookups/redis.c */ |