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Add fetch methods to transport library.
[git/mingw.git] / http.c
bloba95483be8b41664824b57883bcc4801ea0d10311
1 #include "http.h"
2
3 int data_received;
4 int active_requests = 0;
5
6 #ifdef USE_CURL_MULTI
7 int max_requests = -1;
8 CURLM *curlm;
9 #endif
10 #ifndef NO_CURL_EASY_DUPHANDLE
11 CURL *curl_default;
12 #endif
13 char curl_errorstr[CURL_ERROR_SIZE];
14
15 int curl_ssl_verify = -1;
16 char *ssl_cert = NULL;
17 #if LIBCURL_VERSION_NUM >= 0x070902
18 char *ssl_key = NULL;
19 #endif
20 #if LIBCURL_VERSION_NUM >= 0x070908
21 char *ssl_capath = NULL;
22 #endif
23 char *ssl_cainfo = NULL;
24 long curl_low_speed_limit = -1;
25 long curl_low_speed_time = -1;
26 int curl_ftp_no_epsv = 0;
27
28 struct curl_slist *pragma_header;
29
30 struct active_request_slot *active_queue_head = NULL;
31
32 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
33 struct buffer *buffer)
34 {
35 size_t size = eltsize * nmemb;
36 if (size > buffer->size - buffer->posn)
37 size = buffer->size - buffer->posn;
38 memcpy(ptr, (char *) buffer->buffer + buffer->posn, size);
39 buffer->posn += size;
40 return size;
41 }
42
43 size_t fwrite_buffer(const void *ptr, size_t eltsize,
44 size_t nmemb, struct buffer *buffer)
45 {
46 size_t size = eltsize * nmemb;
47 if (size > buffer->size - buffer->posn) {
48 buffer->size = buffer->size * 3 / 2;
49 if (buffer->size < buffer->posn + size)
50 buffer->size = buffer->posn + size;
51 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
52 }
53 memcpy((char *) buffer->buffer + buffer->posn, ptr, size);
54 buffer->posn += size;
55 data_received++;
56 return size;
57 }
58
59 size_t fwrite_null(const void *ptr, size_t eltsize,
60 size_t nmemb, struct buffer *buffer)
61 {
62 data_received++;
63 return eltsize * nmemb;
64 }
65
66 static void finish_active_slot(struct active_request_slot *slot);
67
68 #ifdef USE_CURL_MULTI
69 static void process_curl_messages(void)
70 {
71 int num_messages;
72 struct active_request_slot *slot;
73 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
74
75 while (curl_message != NULL) {
76 if (curl_message->msg == CURLMSG_DONE) {
77 int curl_result = curl_message->data.result;
78 slot = active_queue_head;
79 while (slot != NULL &&
80 slot->curl != curl_message->easy_handle)
81 slot = slot->next;
82 if (slot != NULL) {
83 curl_multi_remove_handle(curlm, slot->curl);
84 slot->curl_result = curl_result;
85 finish_active_slot(slot);
86 } else {
87 fprintf(stderr, "Received DONE message for unknown request!\n");
88 }
89 } else {
90 fprintf(stderr, "Unknown CURL message received: %d\n",
91 (int)curl_message->msg);
92 }
93 curl_message = curl_multi_info_read(curlm, &num_messages);
94 }
95 }
96 #endif
97
98 static int http_options(const char *var, const char *value)
99 {
100 if (!strcmp("http.sslverify", var)) {
101 if (curl_ssl_verify == -1) {
102 curl_ssl_verify = git_config_bool(var, value);
103 }
104 return 0;
105 }
106
107 if (!strcmp("http.sslcert", var)) {
108 if (ssl_cert == NULL) {
109 ssl_cert = xmalloc(strlen(value)+1);
110 strcpy(ssl_cert, value);
111 }
112 return 0;
113 }
114 #if LIBCURL_VERSION_NUM >= 0x070902
115 if (!strcmp("http.sslkey", var)) {
116 if (ssl_key == NULL) {
117 ssl_key = xmalloc(strlen(value)+1);
118 strcpy(ssl_key, value);
119 }
120 return 0;
121 }
122 #endif
123 #if LIBCURL_VERSION_NUM >= 0x070908
124 if (!strcmp("http.sslcapath", var)) {
125 if (ssl_capath == NULL) {
126 ssl_capath = xmalloc(strlen(value)+1);
127 strcpy(ssl_capath, value);
128 }
129 return 0;
130 }
131 #endif
132 if (!strcmp("http.sslcainfo", var)) {
133 if (ssl_cainfo == NULL) {
134 ssl_cainfo = xmalloc(strlen(value)+1);
135 strcpy(ssl_cainfo, value);
136 }
137 return 0;
138 }
139
140 #ifdef USE_CURL_MULTI
141 if (!strcmp("http.maxrequests", var)) {
142 if (max_requests == -1)
143 max_requests = git_config_int(var, value);
144 return 0;
145 }
146 #endif
147
148 if (!strcmp("http.lowspeedlimit", var)) {
149 if (curl_low_speed_limit == -1)
150 curl_low_speed_limit = (long)git_config_int(var, value);
151 return 0;
152 }
153 if (!strcmp("http.lowspeedtime", var)) {
154 if (curl_low_speed_time == -1)
155 curl_low_speed_time = (long)git_config_int(var, value);
156 return 0;
157 }
158
159 if (!strcmp("http.noepsv", var)) {
160 curl_ftp_no_epsv = git_config_bool(var, value);
161 return 0;
162 }
163
164 /* Fall back on the default ones */
165 return git_default_config(var, value);
166 }
167
168 static CURL* get_curl_handle(void)
169 {
170 CURL* result = curl_easy_init();
171
172 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
173 #if LIBCURL_VERSION_NUM >= 0x070907
174 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
175 #endif
176
177 if (ssl_cert != NULL)
178 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
179 #if LIBCURL_VERSION_NUM >= 0x070902
180 if (ssl_key != NULL)
181 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
182 #endif
183 #if LIBCURL_VERSION_NUM >= 0x070908
184 if (ssl_capath != NULL)
185 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
186 #endif
187 if (ssl_cainfo != NULL)
188 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
189 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
190
191 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
192 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
193 curl_low_speed_limit);
194 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
195 curl_low_speed_time);
196 }
197
198 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
199
200 if (getenv("GIT_CURL_VERBOSE"))
201 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
202
203 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
204
205 if (curl_ftp_no_epsv)
206 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
207
208 return result;
209 }
210
211 void http_init(void)
212 {
213 char *low_speed_limit;
214 char *low_speed_time;
215
216 curl_global_init(CURL_GLOBAL_ALL);
217
218 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
219
220 #ifdef USE_CURL_MULTI
221 {
222 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
223 if (http_max_requests != NULL)
224 max_requests = atoi(http_max_requests);
225 }
226
227 curlm = curl_multi_init();
228 if (curlm == NULL) {
229 fprintf(stderr, "Error creating curl multi handle.\n");
230 exit(1);
231 }
232 #endif
233
234 if (getenv("GIT_SSL_NO_VERIFY"))
235 curl_ssl_verify = 0;
236
237 ssl_cert = getenv("GIT_SSL_CERT");
238 #if LIBCURL_VERSION_NUM >= 0x070902
239 ssl_key = getenv("GIT_SSL_KEY");
240 #endif
241 #if LIBCURL_VERSION_NUM >= 0x070908
242 ssl_capath = getenv("GIT_SSL_CAPATH");
243 #endif
244 ssl_cainfo = getenv("GIT_SSL_CAINFO");
245
246 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
247 if (low_speed_limit != NULL)
248 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
249 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
250 if (low_speed_time != NULL)
251 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
252
253 git_config(http_options);
254
255 if (curl_ssl_verify == -1)
256 curl_ssl_verify = 1;
257
258 #ifdef USE_CURL_MULTI
259 if (max_requests < 1)
260 max_requests = DEFAULT_MAX_REQUESTS;
261 #endif
262
263 if (getenv("GIT_CURL_FTP_NO_EPSV"))
264 curl_ftp_no_epsv = 1;
265
266 #ifndef NO_CURL_EASY_DUPHANDLE
267 curl_default = get_curl_handle();
268 #endif
269 }
270
271 void http_cleanup(void)
272 {
273 struct active_request_slot *slot = active_queue_head;
274 #ifdef USE_CURL_MULTI
275 char *wait_url;
276 #endif
277
278 while (slot != NULL) {
279 #ifdef USE_CURL_MULTI
280 if (slot->in_use) {
281 curl_easy_getinfo(slot->curl,
282 CURLINFO_EFFECTIVE_URL,
283 &wait_url);
284 fprintf(stderr, "Waiting for %s\n", wait_url);
285 run_active_slot(slot);
286 }
287 #endif
288 if (slot->curl != NULL)
289 curl_easy_cleanup(slot->curl);
290 slot = slot->next;
291 }
292
293 #ifndef NO_CURL_EASY_DUPHANDLE
294 curl_easy_cleanup(curl_default);
295 #endif
296
297 #ifdef USE_CURL_MULTI
298 curl_multi_cleanup(curlm);
299 #endif
300 curl_global_cleanup();
301
302 curl_slist_free_all(pragma_header);
303 pragma_header = NULL;
304 }
305
306 struct active_request_slot *get_active_slot(void)
307 {
308 struct active_request_slot *slot = active_queue_head;
309 struct active_request_slot *newslot;
310
311 #ifdef USE_CURL_MULTI
312 int num_transfers;
313
314 /* Wait for a slot to open up if the queue is full */
315 while (active_requests >= max_requests) {
316 curl_multi_perform(curlm, &num_transfers);
317 if (num_transfers < active_requests) {
318 process_curl_messages();
319 }
320 }
321 #endif
322
323 while (slot != NULL && slot->in_use) {
324 slot = slot->next;
325 }
326 if (slot == NULL) {
327 newslot = xmalloc(sizeof(*newslot));
328 newslot->curl = NULL;
329 newslot->in_use = 0;
330 newslot->next = NULL;
331
332 slot = active_queue_head;
333 if (slot == NULL) {
334 active_queue_head = newslot;
335 } else {
336 while (slot->next != NULL) {
337 slot = slot->next;
338 }
339 slot->next = newslot;
340 }
341 slot = newslot;
342 }
343
344 if (slot->curl == NULL) {
345 #ifdef NO_CURL_EASY_DUPHANDLE
346 slot->curl = get_curl_handle();
347 #else
348 slot->curl = curl_easy_duphandle(curl_default);
349 #endif
350 }
351
352 active_requests++;
353 slot->in_use = 1;
354 slot->local = NULL;
355 slot->results = NULL;
356 slot->finished = NULL;
357 slot->callback_data = NULL;
358 slot->callback_func = NULL;
359 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
360 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
361 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
362 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
363 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
364 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
365 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
366 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
367
368 return slot;
369 }
370
371 int start_active_slot(struct active_request_slot *slot)
372 {
373 #ifdef USE_CURL_MULTI
374 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
375 int num_transfers;
376
377 if (curlm_result != CURLM_OK &&
378 curlm_result != CURLM_CALL_MULTI_PERFORM) {
379 active_requests--;
380 slot->in_use = 0;
381 return 0;
382 }
383
384 /*
385 * We know there must be something to do, since we just added
386 * something.
387 */
388 curl_multi_perform(curlm, &num_transfers);
389 #endif
390 return 1;
391 }
392
393 #ifdef USE_CURL_MULTI
394 struct fill_chain {
395 void *data;
396 int (*fill)(void *);
397 struct fill_chain *next;
398 };
399
400 static struct fill_chain *fill_cfg = NULL;
401
402 void add_fill_function(void *data, int (*fill)(void *))
403 {
404 struct fill_chain *new = malloc(sizeof(*new));
405 struct fill_chain **linkp = &fill_cfg;
406 new->data = data;
407 new->fill = fill;
408 new->next = NULL;
409 while (*linkp)
410 linkp = &(*linkp)->next;
411 *linkp = new;
412 }
413
414 void fill_active_slots(void)
415 {
416 struct active_request_slot *slot = active_queue_head;
417
418 while (active_requests < max_requests) {
419 struct fill_chain *fill;
420 for (fill = fill_cfg; fill; fill = fill->next)
421 if (fill->fill(fill->data))
422 break;
423
424 if (!fill)
425 break;
426 }
427
428 while (slot != NULL) {
429 if (!slot->in_use && slot->curl != NULL) {
430 curl_easy_cleanup(slot->curl);
431 slot->curl = NULL;
432 }
433 slot = slot->next;
434 }
435 }
436
437 void step_active_slots(void)
438 {
439 int num_transfers;
440 CURLMcode curlm_result;
441
442 do {
443 curlm_result = curl_multi_perform(curlm, &num_transfers);
444 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
445 if (num_transfers < active_requests) {
446 process_curl_messages();
447 fill_active_slots();
448 }
449 }
450 #endif
451
452 void run_active_slot(struct active_request_slot *slot)
453 {
454 #ifdef USE_CURL_MULTI
455 long last_pos = 0;
456 long current_pos;
457 fd_set readfds;
458 fd_set writefds;
459 fd_set excfds;
460 int max_fd;
461 struct timeval select_timeout;
462 int finished = 0;
463
464 slot->finished = &finished;
465 while (!finished) {
466 data_received = 0;
467 step_active_slots();
468
469 if (!data_received && slot->local != NULL) {
470 current_pos = ftell(slot->local);
471 if (current_pos > last_pos)
472 data_received++;
473 last_pos = current_pos;
474 }
475
476 if (slot->in_use && !data_received) {
477 max_fd = 0;
478 FD_ZERO(&readfds);
479 FD_ZERO(&writefds);
480 FD_ZERO(&excfds);
481 select_timeout.tv_sec = 0;
482 select_timeout.tv_usec = 50000;
483 select(max_fd, &readfds, &writefds,
484 &excfds, &select_timeout);
485 }
486 }
487 #else
488 while (slot->in_use) {
489 slot->curl_result = curl_easy_perform(slot->curl);
490 finish_active_slot(slot);
491 }
492 #endif
493 }
494
495 static void closedown_active_slot(struct active_request_slot *slot)
496 {
497 active_requests--;
498 slot->in_use = 0;
499 }
500
501 void release_active_slot(struct active_request_slot *slot)
502 {
503 closedown_active_slot(slot);
504 if (slot->curl) {
505 #ifdef USE_CURL_MULTI
506 curl_multi_remove_handle(curlm, slot->curl);
507 #endif
508 curl_easy_cleanup(slot->curl);
509 slot->curl = NULL;
510 }
511 #ifdef USE_CURL_MULTI
512 fill_active_slots();
513 #endif
514 }
515
516 static void finish_active_slot(struct active_request_slot *slot)
517 {
518 closedown_active_slot(slot);
519 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
520
521 if (slot->finished != NULL)
522 (*slot->finished) = 1;
523
524 /* Store slot results so they can be read after the slot is reused */
525 if (slot->results != NULL) {
526 slot->results->curl_result = slot->curl_result;
527 slot->results->http_code = slot->http_code;
528 }
529
530 /* Run callback if appropriate */
531 if (slot->callback_func != NULL) {
532 slot->callback_func(slot->callback_data);
533 }
534 }
535
536 void finish_all_active_slots(void)
537 {
538 struct active_request_slot *slot = active_queue_head;
539
540 while (slot != NULL)
541 if (slot->in_use) {
542 run_active_slot(slot);
543 slot = active_queue_head;
544 } else {
545 slot = slot->next;
546 }
547 }
MinGW port of GIT