eefb0f03d2f7ac30163e69b842f6943987cf9351
[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 struct curl_slist *no_range_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, 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(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 /* Fall back on the default ones */
160 return git_default_config(var, value);
161 }
162
163 static CURL* get_curl_handle(void)
164 {
165 CURL* result = curl_easy_init();
166
167 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
168 #if LIBCURL_VERSION_NUM >= 0x070907
169 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
170 #endif
171
172 if (ssl_cert != NULL)
173 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
174 #if LIBCURL_VERSION_NUM >= 0x070902
175 if (ssl_key != NULL)
176 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
177 #endif
178 #if LIBCURL_VERSION_NUM >= 0x070908
179 if (ssl_capath != NULL)
180 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
181 #endif
182 if (ssl_cainfo != NULL)
183 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
184 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
185
186 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
187 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
188 curl_low_speed_limit);
189 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
190 curl_low_speed_time);
191 }
192
193 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
194
195 return result;
196 }
197
198 void http_init(void)
199 {
200 char *low_speed_limit;
201 char *low_speed_time;
202
203 curl_global_init(CURL_GLOBAL_ALL);
204
205 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
206 no_range_header = curl_slist_append(no_range_header, "Range:");
207
208 #ifdef USE_CURL_MULTI
209 {
210 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
211 if (http_max_requests != NULL)
212 max_requests = atoi(http_max_requests);
213 }
214
215 curlm = curl_multi_init();
216 if (curlm == NULL) {
217 fprintf(stderr, "Error creating curl multi handle.\n");
218 exit(1);
219 }
220 #endif
221
222 if (getenv("GIT_SSL_NO_VERIFY"))
223 curl_ssl_verify = 0;
224
225 ssl_cert = getenv("GIT_SSL_CERT");
226 #if LIBCURL_VERSION_NUM >= 0x070902
227 ssl_key = getenv("GIT_SSL_KEY");
228 #endif
229 #if LIBCURL_VERSION_NUM >= 0x070908
230 ssl_capath = getenv("GIT_SSL_CAPATH");
231 #endif
232 ssl_cainfo = getenv("GIT_SSL_CAINFO");
233
234 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
235 if (low_speed_limit != NULL)
236 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
237 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
238 if (low_speed_time != NULL)
239 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
240
241 git_config(http_options);
242
243 if (curl_ssl_verify == -1)
244 curl_ssl_verify = 1;
245
246 #ifdef USE_CURL_MULTI
247 if (max_requests < 1)
248 max_requests = DEFAULT_MAX_REQUESTS;
249 #endif
250
251 #ifndef NO_CURL_EASY_DUPHANDLE
252 curl_default = get_curl_handle();
253 #endif
254 }
255
256 void http_cleanup(void)
257 {
258 struct active_request_slot *slot = active_queue_head;
259 #ifdef USE_CURL_MULTI
260 char *wait_url;
261 #endif
262
263 while (slot != NULL) {
264 #ifdef USE_CURL_MULTI
265 if (slot->in_use) {
266 curl_easy_getinfo(slot->curl,
267 CURLINFO_EFFECTIVE_URL,
268 &wait_url);
269 fprintf(stderr, "Waiting for %s\n", wait_url);
270 run_active_slot(slot);
271 }
272 #endif
273 if (slot->curl != NULL)
274 curl_easy_cleanup(slot->curl);
275 slot = slot->next;
276 }
277
278 #ifndef NO_CURL_EASY_DUPHANDLE
279 curl_easy_cleanup(curl_default);
280 #endif
281
282 #ifdef USE_CURL_MULTI
283 curl_multi_cleanup(curlm);
284 #endif
285 curl_global_cleanup();
286
287 }
288
289 struct active_request_slot *get_active_slot(void)
290 {
291 struct active_request_slot *slot = active_queue_head;
292 struct active_request_slot *newslot;
293
294 #ifdef USE_CURL_MULTI
295 int num_transfers;
296
297 /* Wait for a slot to open up if the queue is full */
298 while (active_requests >= max_requests) {
299 curl_multi_perform(curlm, &num_transfers);
300 if (num_transfers < active_requests) {
301 process_curl_messages();
302 }
303 }
304 #endif
305
306 while (slot != NULL && slot->in_use) {
307 slot = slot->next;
308 }
309 if (slot == NULL) {
310 newslot = xmalloc(sizeof(*newslot));
311 newslot->curl = NULL;
312 newslot->in_use = 0;
313 newslot->next = NULL;
314
315 slot = active_queue_head;
316 if (slot == NULL) {
317 active_queue_head = newslot;
318 } else {
319 while (slot->next != NULL) {
320 slot = slot->next;
321 }
322 slot->next = newslot;
323 }
324 slot = newslot;
325 }
326
327 if (slot->curl == NULL) {
328 #ifdef NO_CURL_EASY_DUPHANDLE
329 slot->curl = get_curl_handle();
330 #else
331 slot->curl = curl_easy_duphandle(curl_default);
332 #endif
333 }
334
335 active_requests++;
336 slot->in_use = 1;
337 slot->local = NULL;
338 slot->results = NULL;
339 slot->callback_data = NULL;
340 slot->callback_func = NULL;
341 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
342 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, no_range_header);
343 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
344
345 return slot;
346 }
347
348 int start_active_slot(struct active_request_slot *slot)
349 {
350 #ifdef USE_CURL_MULTI
351 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
352
353 if (curlm_result != CURLM_OK &&
354 curlm_result != CURLM_CALL_MULTI_PERFORM) {
355 active_requests--;
356 slot->in_use = 0;
357 return 0;
358 }
359 #endif
360 return 1;
361 }
362
363 #ifdef USE_CURL_MULTI
364 void step_active_slots(void)
365 {
366 int num_transfers;
367 CURLMcode curlm_result;
368
369 do {
370 curlm_result = curl_multi_perform(curlm, &num_transfers);
371 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
372 if (num_transfers < active_requests) {
373 process_curl_messages();
374 fill_active_slots();
375 }
376 }
377 #endif
378
379 void run_active_slot(struct active_request_slot *slot)
380 {
381 #ifdef USE_CURL_MULTI
382 long last_pos = 0;
383 long current_pos;
384 fd_set readfds;
385 fd_set writefds;
386 fd_set excfds;
387 int max_fd;
388 struct timeval select_timeout;
389
390 while (slot->in_use) {
391 data_received = 0;
392 step_active_slots();
393
394 if (!data_received && slot->local != NULL) {
395 current_pos = ftell(slot->local);
396 if (current_pos > last_pos)
397 data_received++;
398 last_pos = current_pos;
399 }
400
401 if (slot->in_use && !data_received) {
402 max_fd = 0;
403 FD_ZERO(&readfds);
404 FD_ZERO(&writefds);
405 FD_ZERO(&excfds);
406 select_timeout.tv_sec = 0;
407 select_timeout.tv_usec = 50000;
408 select(max_fd, &readfds, &writefds,
409 &excfds, &select_timeout);
410 }
411 }
412 #else
413 while (slot->in_use) {
414 slot->curl_result = curl_easy_perform(slot->curl);
415 finish_active_slot(slot);
416 }
417 #endif
418 }
419
420 static void finish_active_slot(struct active_request_slot *slot)
421 {
422 active_requests--;
423 slot->in_use = 0;
424 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
425
426 /* Store slot results so they can be read after the slot is reused */
427 if (slot->results != NULL) {
428 slot->results->curl_result = slot->curl_result;
429 slot->results->http_code = slot->http_code;
430 }
431
432 /* Run callback if appropriate */
433 if (slot->callback_func != NULL) {
434 slot->callback_func(slot->callback_data);
435 }
436 }
437
438 void finish_all_active_slots(void)
439 {
440 struct active_request_slot *slot = active_queue_head;
441
442 while (slot != NULL)
443 if (slot->in_use) {
444 run_active_slot(slot);
445 slot = active_queue_head;
446 } else {
447 slot = slot->next;
448 }
449 }