6c1937b676ecd584cededed1c82df30448046ebe
[git/git.git] / http.c
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
27 struct curl_slist *pragma_header;
28
29 struct active_request_slot *active_queue_head = NULL;
30
31 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
32 struct buffer *buffer)
33 {
34 size_t size = eltsize * nmemb;
35 if (size > buffer->size - buffer->posn)
36 size = buffer->size - buffer->posn;
37 memcpy(ptr, (char *) buffer->buffer + buffer->posn, size);
38 buffer->posn += size;
39 return size;
40 }
41
42 size_t fwrite_buffer(const void *ptr, size_t eltsize,
43 size_t nmemb, struct buffer *buffer)
44 {
45 size_t size = eltsize * nmemb;
46 if (size > buffer->size - buffer->posn) {
47 buffer->size = buffer->size * 3 / 2;
48 if (buffer->size < buffer->posn + size)
49 buffer->size = buffer->posn + size;
50 buffer->buffer = xrealloc(buffer->buffer, buffer->size);
51 }
52 memcpy((char *) buffer->buffer + buffer->posn, ptr, size);
53 buffer->posn += size;
54 data_received++;
55 return size;
56 }
57
58 size_t fwrite_null(const void *ptr, size_t eltsize,
59 size_t nmemb, struct buffer *buffer)
60 {
61 data_received++;
62 return eltsize * nmemb;
63 }
64
65 static void finish_active_slot(struct active_request_slot *slot);
66
67 #ifdef USE_CURL_MULTI
68 static void process_curl_messages(void)
69 {
70 int num_messages;
71 struct active_request_slot *slot;
72 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
73
74 while (curl_message != NULL) {
75 if (curl_message->msg == CURLMSG_DONE) {
76 int curl_result = curl_message->data.result;
77 slot = active_queue_head;
78 while (slot != NULL &&
79 slot->curl != curl_message->easy_handle)
80 slot = slot->next;
81 if (slot != NULL) {
82 curl_multi_remove_handle(curlm, slot->curl);
83 slot->curl_result = curl_result;
84 finish_active_slot(slot);
85 } else {
86 fprintf(stderr, "Received DONE message for unknown request!\n");
87 }
88 } else {
89 fprintf(stderr, "Unknown CURL message received: %d\n",
90 (int)curl_message->msg);
91 }
92 curl_message = curl_multi_info_read(curlm, &num_messages);
93 }
94 }
95 #endif
96
97 static int http_options(const char *var, const char *value)
98 {
99 if (!strcmp("http.sslverify", var)) {
100 if (curl_ssl_verify == -1) {
101 curl_ssl_verify = git_config_bool(var, value);
102 }
103 return 0;
104 }
105
106 if (!strcmp("http.sslcert", var)) {
107 if (ssl_cert == NULL) {
108 ssl_cert = xmalloc(strlen(value)+1);
109 strcpy(ssl_cert, value);
110 }
111 return 0;
112 }
113 #if LIBCURL_VERSION_NUM >= 0x070902
114 if (!strcmp("http.sslkey", var)) {
115 if (ssl_key == NULL) {
116 ssl_key = xmalloc(strlen(value)+1);
117 strcpy(ssl_key, value);
118 }
119 return 0;
120 }
121 #endif
122 #if LIBCURL_VERSION_NUM >= 0x070908
123 if (!strcmp("http.sslcapath", var)) {
124 if (ssl_capath == NULL) {
125 ssl_capath = xmalloc(strlen(value)+1);
126 strcpy(ssl_capath, value);
127 }
128 return 0;
129 }
130 #endif
131 if (!strcmp("http.sslcainfo", var)) {
132 if (ssl_cainfo == NULL) {
133 ssl_cainfo = xmalloc(strlen(value)+1);
134 strcpy(ssl_cainfo, value);
135 }
136 return 0;
137 }
138
139 #ifdef USE_CURL_MULTI
140 if (!strcmp("http.maxrequests", var)) {
141 if (max_requests == -1)
142 max_requests = git_config_int(var, value);
143 return 0;
144 }
145 #endif
146
147 if (!strcmp("http.lowspeedlimit", var)) {
148 if (curl_low_speed_limit == -1)
149 curl_low_speed_limit = (long)git_config_int(var, value);
150 return 0;
151 }
152 if (!strcmp("http.lowspeedtime", var)) {
153 if (curl_low_speed_time == -1)
154 curl_low_speed_time = (long)git_config_int(var, value);
155 return 0;
156 }
157
158 /* Fall back on the default ones */
159 return git_default_config(var, value);
160 }
161
162 static CURL* get_curl_handle(void)
163 {
164 CURL* result = curl_easy_init();
165
166 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
167 #if LIBCURL_VERSION_NUM >= 0x070907
168 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
169 #endif
170
171 if (ssl_cert != NULL)
172 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
173 #if LIBCURL_VERSION_NUM >= 0x070902
174 if (ssl_key != NULL)
175 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
176 #endif
177 #if LIBCURL_VERSION_NUM >= 0x070908
178 if (ssl_capath != NULL)
179 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
180 #endif
181 if (ssl_cainfo != NULL)
182 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
183 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
184
185 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
186 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
187 curl_low_speed_limit);
188 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
189 curl_low_speed_time);
190 }
191
192 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
193
194 if (getenv("GIT_CURL_VERBOSE"))
195 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
196
197 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
198
199 return result;
200 }
201
202 void http_init(void)
203 {
204 char *low_speed_limit;
205 char *low_speed_time;
206
207 curl_global_init(CURL_GLOBAL_ALL);
208
209 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
210
211 #ifdef USE_CURL_MULTI
212 {
213 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
214 if (http_max_requests != NULL)
215 max_requests = atoi(http_max_requests);
216 }
217
218 curlm = curl_multi_init();
219 if (curlm == NULL) {
220 fprintf(stderr, "Error creating curl multi handle.\n");
221 exit(1);
222 }
223 #endif
224
225 if (getenv("GIT_SSL_NO_VERIFY"))
226 curl_ssl_verify = 0;
227
228 ssl_cert = getenv("GIT_SSL_CERT");
229 #if LIBCURL_VERSION_NUM >= 0x070902
230 ssl_key = getenv("GIT_SSL_KEY");
231 #endif
232 #if LIBCURL_VERSION_NUM >= 0x070908
233 ssl_capath = getenv("GIT_SSL_CAPATH");
234 #endif
235 ssl_cainfo = getenv("GIT_SSL_CAINFO");
236
237 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
238 if (low_speed_limit != NULL)
239 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
240 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
241 if (low_speed_time != NULL)
242 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
243
244 git_config(http_options);
245
246 if (curl_ssl_verify == -1)
247 curl_ssl_verify = 1;
248
249 #ifdef USE_CURL_MULTI
250 if (max_requests < 1)
251 max_requests = DEFAULT_MAX_REQUESTS;
252 #endif
253
254 #ifndef NO_CURL_EASY_DUPHANDLE
255 curl_default = get_curl_handle();
256 #endif
257 }
258
259 void http_cleanup(void)
260 {
261 struct active_request_slot *slot = active_queue_head;
262 #ifdef USE_CURL_MULTI
263 char *wait_url;
264 #endif
265
266 while (slot != NULL) {
267 #ifdef USE_CURL_MULTI
268 if (slot->in_use) {
269 curl_easy_getinfo(slot->curl,
270 CURLINFO_EFFECTIVE_URL,
271 &wait_url);
272 fprintf(stderr, "Waiting for %s\n", wait_url);
273 run_active_slot(slot);
274 }
275 #endif
276 if (slot->curl != NULL)
277 curl_easy_cleanup(slot->curl);
278 slot = slot->next;
279 }
280
281 #ifndef NO_CURL_EASY_DUPHANDLE
282 curl_easy_cleanup(curl_default);
283 #endif
284
285 #ifdef USE_CURL_MULTI
286 curl_multi_cleanup(curlm);
287 #endif
288 curl_global_cleanup();
289
290 curl_slist_free_all(pragma_header);
291 }
292
293 struct active_request_slot *get_active_slot(void)
294 {
295 struct active_request_slot *slot = active_queue_head;
296 struct active_request_slot *newslot;
297
298 #ifdef USE_CURL_MULTI
299 int num_transfers;
300
301 /* Wait for a slot to open up if the queue is full */
302 while (active_requests >= max_requests) {
303 curl_multi_perform(curlm, &num_transfers);
304 if (num_transfers < active_requests) {
305 process_curl_messages();
306 }
307 }
308 #endif
309
310 while (slot != NULL && slot->in_use) {
311 slot = slot->next;
312 }
313 if (slot == NULL) {
314 newslot = xmalloc(sizeof(*newslot));
315 newslot->curl = NULL;
316 newslot->in_use = 0;
317 newslot->next = NULL;
318
319 slot = active_queue_head;
320 if (slot == NULL) {
321 active_queue_head = newslot;
322 } else {
323 while (slot->next != NULL) {
324 slot = slot->next;
325 }
326 slot->next = newslot;
327 }
328 slot = newslot;
329 }
330
331 if (slot->curl == NULL) {
332 #ifdef NO_CURL_EASY_DUPHANDLE
333 slot->curl = get_curl_handle();
334 #else
335 slot->curl = curl_easy_duphandle(curl_default);
336 #endif
337 }
338
339 active_requests++;
340 slot->in_use = 1;
341 slot->local = NULL;
342 slot->results = NULL;
343 slot->finished = NULL;
344 slot->callback_data = NULL;
345 slot->callback_func = NULL;
346 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
347 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
348 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
349 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
350 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
351 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
352 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
353 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
354
355 return slot;
356 }
357
358 int start_active_slot(struct active_request_slot *slot)
359 {
360 #ifdef USE_CURL_MULTI
361 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
362
363 if (curlm_result != CURLM_OK &&
364 curlm_result != CURLM_CALL_MULTI_PERFORM) {
365 active_requests--;
366 slot->in_use = 0;
367 return 0;
368 }
369 #endif
370 return 1;
371 }
372
373 #ifdef USE_CURL_MULTI
374 void step_active_slots(void)
375 {
376 int num_transfers;
377 CURLMcode curlm_result;
378
379 do {
380 curlm_result = curl_multi_perform(curlm, &num_transfers);
381 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
382 if (num_transfers < active_requests) {
383 process_curl_messages();
384 fill_active_slots();
385 }
386 }
387 #endif
388
389 void run_active_slot(struct active_request_slot *slot)
390 {
391 #ifdef USE_CURL_MULTI
392 long last_pos = 0;
393 long current_pos;
394 fd_set readfds;
395 fd_set writefds;
396 fd_set excfds;
397 int max_fd;
398 struct timeval select_timeout;
399 int finished = 0;
400
401 slot->finished = &finished;
402 while (!finished) {
403 data_received = 0;
404 step_active_slots();
405
406 if (!data_received && slot->local != NULL) {
407 current_pos = ftell(slot->local);
408 if (current_pos > last_pos)
409 data_received++;
410 last_pos = current_pos;
411 }
412
413 if (slot->in_use && !data_received) {
414 max_fd = 0;
415 FD_ZERO(&readfds);
416 FD_ZERO(&writefds);
417 FD_ZERO(&excfds);
418 select_timeout.tv_sec = 0;
419 select_timeout.tv_usec = 50000;
420 select(max_fd, &readfds, &writefds,
421 &excfds, &select_timeout);
422 }
423 }
424 #else
425 while (slot->in_use) {
426 slot->curl_result = curl_easy_perform(slot->curl);
427 finish_active_slot(slot);
428 }
429 #endif
430 }
431
432 static void closedown_active_slot(struct active_request_slot *slot)
433 {
434 active_requests--;
435 slot->in_use = 0;
436 }
437
438 void release_active_slot(struct active_request_slot *slot)
439 {
440 closedown_active_slot(slot);
441 if (slot->curl) {
442 #ifdef USE_CURL_MULTI
443 curl_multi_remove_handle(curlm, slot->curl);
444 #endif
445 curl_easy_cleanup(slot->curl);
446 slot->curl = NULL;
447 }
448 #ifdef USE_CURL_MULTI
449 fill_active_slots();
450 #endif
451 }
452
453 static void finish_active_slot(struct active_request_slot *slot)
454 {
455 closedown_active_slot(slot);
456 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
457
458 if (slot->finished != NULL)
459 (*slot->finished) = 1;
460
461 /* Store slot results so they can be read after the slot is reused */
462 if (slot->results != NULL) {
463 slot->results->curl_result = slot->curl_result;
464 slot->results->http_code = slot->http_code;
465 }
466
467 /* Run callback if appropriate */
468 if (slot->callback_func != NULL) {
469 slot->callback_func(slot->callback_data);
470 }
471 }
472
473 void finish_all_active_slots(void)
474 {
475 struct active_request_slot *slot = active_queue_head;
476
477 while (slot != NULL)
478 if (slot->in_use) {
479 run_active_slot(slot);
480 slot = active_queue_head;
481 } else {
482 slot = slot->next;
483 }
484 }