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cvsexportcommit: introduce -W for shared working trees (between Git and CVS)
[git/jnareb-git.git] / http.c
blobacf746a12da0f0b5e3fe3f097a6626e17da8852c
1 #include "http.h"
2
3 int data_received;
4 int active_requests = 0;
5
6 #ifdef USE_CURL_MULTI
7 static int max_requests = -1;
8 static CURLM *curlm;
9 #endif
10 #ifndef NO_CURL_EASY_DUPHANDLE
11 static CURL *curl_default;
12 #endif
13 char curl_errorstr[CURL_ERROR_SIZE];
14
15 static int curl_ssl_verify = -1;
16 static char *ssl_cert = NULL;
17 #if LIBCURL_VERSION_NUM >= 0x070902
18 static char *ssl_key = NULL;
19 #endif
20 #if LIBCURL_VERSION_NUM >= 0x070908
21 static char *ssl_capath = NULL;
22 #endif
23 static char *ssl_cainfo = NULL;
24 static long curl_low_speed_limit = -1;
25 static long curl_low_speed_time = -1;
26 static int curl_ftp_no_epsv = 0;
27 static char *curl_http_proxy = NULL;
28
29 static struct curl_slist *pragma_header;
30
31 static struct active_request_slot *active_queue_head = NULL;
32
33 size_t fread_buffer(void *ptr, size_t eltsize, size_t nmemb,
34 struct buffer *buffer)
35 {
36 size_t size = eltsize * nmemb;
37 if (size > buffer->buf.len - buffer->posn)
38 size = buffer->buf.len - buffer->posn;
39 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
40 buffer->posn += size;
41
42 return size;
43 }
44
45 size_t fwrite_buffer(const void *ptr, size_t eltsize,
46 size_t nmemb, struct strbuf *buffer)
47 {
48 size_t size = eltsize * nmemb;
49 strbuf_add(buffer, ptr, size);
50 data_received++;
51 return size;
52 }
53
54 size_t fwrite_null(const void *ptr, size_t eltsize,
55 size_t nmemb, struct strbuf *buffer)
56 {
57 data_received++;
58 return eltsize * nmemb;
59 }
60
61 static void finish_active_slot(struct active_request_slot *slot);
62
63 #ifdef USE_CURL_MULTI
64 static void process_curl_messages(void)
65 {
66 int num_messages;
67 struct active_request_slot *slot;
68 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
69
70 while (curl_message != NULL) {
71 if (curl_message->msg == CURLMSG_DONE) {
72 int curl_result = curl_message->data.result;
73 slot = active_queue_head;
74 while (slot != NULL &&
75 slot->curl != curl_message->easy_handle)
76 slot = slot->next;
77 if (slot != NULL) {
78 curl_multi_remove_handle(curlm, slot->curl);
79 slot->curl_result = curl_result;
80 finish_active_slot(slot);
81 } else {
82 fprintf(stderr, "Received DONE message for unknown request!\n");
83 }
84 } else {
85 fprintf(stderr, "Unknown CURL message received: %d\n",
86 (int)curl_message->msg);
87 }
88 curl_message = curl_multi_info_read(curlm, &num_messages);
89 }
90 }
91 #endif
92
93 static int http_options(const char *var, const char *value)
94 {
95 if (!strcmp("http.sslverify", var)) {
96 if (curl_ssl_verify == -1) {
97 curl_ssl_verify = git_config_bool(var, value);
98 }
99 return 0;
100 }
101
102 if (!strcmp("http.sslcert", var)) {
103 if (ssl_cert == NULL) {
104 if (!value)
105 return config_error_nonbool(var);
106 ssl_cert = xstrdup(value);
107 }
108 return 0;
109 }
110 #if LIBCURL_VERSION_NUM >= 0x070902
111 if (!strcmp("http.sslkey", var)) {
112 if (ssl_key == NULL) {
113 if (!value)
114 return config_error_nonbool(var);
115 ssl_key = xstrdup(value);
116 }
117 return 0;
118 }
119 #endif
120 #if LIBCURL_VERSION_NUM >= 0x070908
121 if (!strcmp("http.sslcapath", var)) {
122 if (ssl_capath == NULL) {
123 if (!value)
124 return config_error_nonbool(var);
125 ssl_capath = xstrdup(value);
126 }
127 return 0;
128 }
129 #endif
130 if (!strcmp("http.sslcainfo", var)) {
131 if (ssl_cainfo == NULL) {
132 if (!value)
133 return config_error_nonbool(var);
134 ssl_cainfo = xstrdup(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 if (!strcmp("http.noepsv", var)) {
159 curl_ftp_no_epsv = git_config_bool(var, value);
160 return 0;
161 }
162 if (!strcmp("http.proxy", var)) {
163 if (curl_http_proxy == NULL) {
164 if (!value)
165 return config_error_nonbool(var);
166 curl_http_proxy = xstrdup(value);
167 }
168 return 0;
169 }
170
171 /* Fall back on the default ones */
172 return git_default_config(var, value);
173 }
174
175 static CURL* get_curl_handle(void)
176 {
177 CURL* result = curl_easy_init();
178
179 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, curl_ssl_verify);
180 #if LIBCURL_VERSION_NUM >= 0x070907
181 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
182 #endif
183
184 if (ssl_cert != NULL)
185 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
186 #if LIBCURL_VERSION_NUM >= 0x070902
187 if (ssl_key != NULL)
188 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
189 #endif
190 #if LIBCURL_VERSION_NUM >= 0x070908
191 if (ssl_capath != NULL)
192 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
193 #endif
194 if (ssl_cainfo != NULL)
195 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
196 curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
197
198 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
199 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
200 curl_low_speed_limit);
201 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
202 curl_low_speed_time);
203 }
204
205 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
206
207 if (getenv("GIT_CURL_VERBOSE"))
208 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
209
210 curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
211
212 if (curl_ftp_no_epsv)
213 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
214
215 if (curl_http_proxy)
216 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
217
218 return result;
219 }
220
221 void http_init(struct remote *remote)
222 {
223 char *low_speed_limit;
224 char *low_speed_time;
225
226 curl_global_init(CURL_GLOBAL_ALL);
227
228 if (remote && remote->http_proxy)
229 curl_http_proxy = xstrdup(remote->http_proxy);
230
231 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
232
233 #ifdef USE_CURL_MULTI
234 {
235 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
236 if (http_max_requests != NULL)
237 max_requests = atoi(http_max_requests);
238 }
239
240 curlm = curl_multi_init();
241 if (curlm == NULL) {
242 fprintf(stderr, "Error creating curl multi handle.\n");
243 exit(1);
244 }
245 #endif
246
247 if (getenv("GIT_SSL_NO_VERIFY"))
248 curl_ssl_verify = 0;
249
250 ssl_cert = getenv("GIT_SSL_CERT");
251 #if LIBCURL_VERSION_NUM >= 0x070902
252 ssl_key = getenv("GIT_SSL_KEY");
253 #endif
254 #if LIBCURL_VERSION_NUM >= 0x070908
255 ssl_capath = getenv("GIT_SSL_CAPATH");
256 #endif
257 ssl_cainfo = getenv("GIT_SSL_CAINFO");
258
259 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
260 if (low_speed_limit != NULL)
261 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
262 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
263 if (low_speed_time != NULL)
264 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
265
266 git_config(http_options);
267
268 if (curl_ssl_verify == -1)
269 curl_ssl_verify = 1;
270
271 #ifdef USE_CURL_MULTI
272 if (max_requests < 1)
273 max_requests = DEFAULT_MAX_REQUESTS;
274 #endif
275
276 if (getenv("GIT_CURL_FTP_NO_EPSV"))
277 curl_ftp_no_epsv = 1;
278
279 #ifndef NO_CURL_EASY_DUPHANDLE
280 curl_default = get_curl_handle();
281 #endif
282 }
283
284 void http_cleanup(void)
285 {
286 struct active_request_slot *slot = active_queue_head;
287
288 while (slot != NULL) {
289 struct active_request_slot *next = slot->next;
290 if (slot->curl != NULL) {
291 #ifdef USE_CURL_MULTI
292 curl_multi_remove_handle(curlm, slot->curl);
293 #endif
294 curl_easy_cleanup(slot->curl);
295 }
296 free(slot);
297 slot = next;
298 }
299 active_queue_head = NULL;
300
301 #ifndef NO_CURL_EASY_DUPHANDLE
302 curl_easy_cleanup(curl_default);
303 #endif
304
305 #ifdef USE_CURL_MULTI
306 curl_multi_cleanup(curlm);
307 #endif
308 curl_global_cleanup();
309
310 curl_slist_free_all(pragma_header);
311 pragma_header = NULL;
312
313 if (curl_http_proxy) {
314 free(curl_http_proxy);
315 curl_http_proxy = NULL;
316 }
317 }
318
319 struct active_request_slot *get_active_slot(void)
320 {
321 struct active_request_slot *slot = active_queue_head;
322 struct active_request_slot *newslot;
323
324 #ifdef USE_CURL_MULTI
325 int num_transfers;
326
327 /* Wait for a slot to open up if the queue is full */
328 while (active_requests >= max_requests) {
329 curl_multi_perform(curlm, &num_transfers);
330 if (num_transfers < active_requests) {
331 process_curl_messages();
332 }
333 }
334 #endif
335
336 while (slot != NULL && slot->in_use) {
337 slot = slot->next;
338 }
339 if (slot == NULL) {
340 newslot = xmalloc(sizeof(*newslot));
341 newslot->curl = NULL;
342 newslot->in_use = 0;
343 newslot->next = NULL;
344
345 slot = active_queue_head;
346 if (slot == NULL) {
347 active_queue_head = newslot;
348 } else {
349 while (slot->next != NULL) {
350 slot = slot->next;
351 }
352 slot->next = newslot;
353 }
354 slot = newslot;
355 }
356
357 if (slot->curl == NULL) {
358 #ifdef NO_CURL_EASY_DUPHANDLE
359 slot->curl = get_curl_handle();
360 #else
361 slot->curl = curl_easy_duphandle(curl_default);
362 #endif
363 }
364
365 active_requests++;
366 slot->in_use = 1;
367 slot->local = NULL;
368 slot->results = NULL;
369 slot->finished = NULL;
370 slot->callback_data = NULL;
371 slot->callback_func = NULL;
372 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
373 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
374 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
375 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
376 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
377 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
378 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
379
380 return slot;
381 }
382
383 int start_active_slot(struct active_request_slot *slot)
384 {
385 #ifdef USE_CURL_MULTI
386 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
387 int num_transfers;
388
389 if (curlm_result != CURLM_OK &&
390 curlm_result != CURLM_CALL_MULTI_PERFORM) {
391 active_requests--;
392 slot->in_use = 0;
393 return 0;
394 }
395
396 /*
397 * We know there must be something to do, since we just added
398 * something.
399 */
400 curl_multi_perform(curlm, &num_transfers);
401 #endif
402 return 1;
403 }
404
405 #ifdef USE_CURL_MULTI
406 struct fill_chain {
407 void *data;
408 int (*fill)(void *);
409 struct fill_chain *next;
410 };
411
412 static struct fill_chain *fill_cfg = NULL;
413
414 void add_fill_function(void *data, int (*fill)(void *))
415 {
416 struct fill_chain *new = malloc(sizeof(*new));
417 struct fill_chain **linkp = &fill_cfg;
418 new->data = data;
419 new->fill = fill;
420 new->next = NULL;
421 while (*linkp)
422 linkp = &(*linkp)->next;
423 *linkp = new;
424 }
425
426 void fill_active_slots(void)
427 {
428 struct active_request_slot *slot = active_queue_head;
429
430 while (active_requests < max_requests) {
431 struct fill_chain *fill;
432 for (fill = fill_cfg; fill; fill = fill->next)
433 if (fill->fill(fill->data))
434 break;
435
436 if (!fill)
437 break;
438 }
439
440 while (slot != NULL) {
441 if (!slot->in_use && slot->curl != NULL) {
442 curl_easy_cleanup(slot->curl);
443 slot->curl = NULL;
444 }
445 slot = slot->next;
446 }
447 }
448
449 void step_active_slots(void)
450 {
451 int num_transfers;
452 CURLMcode curlm_result;
453
454 do {
455 curlm_result = curl_multi_perform(curlm, &num_transfers);
456 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
457 if (num_transfers < active_requests) {
458 process_curl_messages();
459 fill_active_slots();
460 }
461 }
462 #endif
463
464 void run_active_slot(struct active_request_slot *slot)
465 {
466 #ifdef USE_CURL_MULTI
467 long last_pos = 0;
468 long current_pos;
469 fd_set readfds;
470 fd_set writefds;
471 fd_set excfds;
472 int max_fd;
473 struct timeval select_timeout;
474 int finished = 0;
475
476 slot->finished = &finished;
477 while (!finished) {
478 data_received = 0;
479 step_active_slots();
480
481 if (!data_received && slot->local != NULL) {
482 current_pos = ftell(slot->local);
483 if (current_pos > last_pos)
484 data_received++;
485 last_pos = current_pos;
486 }
487
488 if (slot->in_use && !data_received) {
489 max_fd = 0;
490 FD_ZERO(&readfds);
491 FD_ZERO(&writefds);
492 FD_ZERO(&excfds);
493 select_timeout.tv_sec = 0;
494 select_timeout.tv_usec = 50000;
495 select(max_fd, &readfds, &writefds,
496 &excfds, &select_timeout);
497 }
498 }
499 #else
500 while (slot->in_use) {
501 slot->curl_result = curl_easy_perform(slot->curl);
502 finish_active_slot(slot);
503 }
504 #endif
505 }
506
507 static void closedown_active_slot(struct active_request_slot *slot)
508 {
509 active_requests--;
510 slot->in_use = 0;
511 }
512
513 void release_active_slot(struct active_request_slot *slot)
514 {
515 closedown_active_slot(slot);
516 if (slot->curl) {
517 #ifdef USE_CURL_MULTI
518 curl_multi_remove_handle(curlm, slot->curl);
519 #endif
520 curl_easy_cleanup(slot->curl);
521 slot->curl = NULL;
522 }
523 #ifdef USE_CURL_MULTI
524 fill_active_slots();
525 #endif
526 }
527
528 static void finish_active_slot(struct active_request_slot *slot)
529 {
530 closedown_active_slot(slot);
531 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
532
533 if (slot->finished != NULL)
534 (*slot->finished) = 1;
535
536 /* Store slot results so they can be read after the slot is reused */
537 if (slot->results != NULL) {
538 slot->results->curl_result = slot->curl_result;
539 slot->results->http_code = slot->http_code;
540 }
541
542 /* Run callback if appropriate */
543 if (slot->callback_func != NULL) {
544 slot->callback_func(slot->callback_data);
545 }
546 }
547
548 void finish_all_active_slots(void)
549 {
550 struct active_request_slot *slot = active_queue_head;
551
552 while (slot != NULL)
553 if (slot->in_use) {
554 run_active_slot(slot);
555 slot = active_queue_head;
556 } else {
557 slot = slot->next;
558 }
559 }
560
561 static inline int needs_quote(int ch)
562 {
563 if (((ch >= 'A') && (ch <= 'Z'))
564 || ((ch >= 'a') && (ch <= 'z'))
565 || ((ch >= '0') && (ch <= '9'))
566 || (ch == '/')
567 || (ch == '-')
568 || (ch == '.'))
569 return 0;
570 return 1;
571 }
572
573 static inline int hex(int v)
574 {
575 if (v < 10) return '0' + v;
576 else return 'A' + v - 10;
577 }
578
579 static char *quote_ref_url(const char *base, const char *ref)
580 {
581 const char *cp;
582 char *dp, *qref;
583 int len, baselen, ch;
584
585 baselen = strlen(base);
586 len = baselen + 7; /* "/refs/" + NUL */
587 for (cp = ref; (ch = *cp) != 0; cp++, len++)
588 if (needs_quote(ch))
589 len += 2; /* extra two hex plus replacement % */
590 qref = xmalloc(len);
591 memcpy(qref, base, baselen);
592 dp = qref + baselen;
593 *(dp++) = '/';
594 for (cp = ref; (ch = *cp) != 0; cp++) {
595 if (needs_quote(ch)) {
596 *dp++ = '%';
597 *dp++ = hex((ch >> 4) & 0xF);
598 *dp++ = hex(ch & 0xF);
599 }
600 else
601 *dp++ = ch;
602 }
603 *dp = 0;
604
605 return qref;
606 }
607
608 int http_fetch_ref(const char *base, struct ref *ref)
609 {
610 char *url;
611 struct strbuf buffer = STRBUF_INIT;
612 struct active_request_slot *slot;
613 struct slot_results results;
614 int ret;
615
616 url = quote_ref_url(base, ref->name);
617 slot = get_active_slot();
618 slot->results = &results;
619 curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
620 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
621 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
622 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
623 if (start_active_slot(slot)) {
624 run_active_slot(slot);
625 if (results.curl_result == CURLE_OK) {
626 strbuf_rtrim(&buffer);
627 if (buffer.len == 40)
628 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
629 else if (!prefixcmp(buffer.buf, "ref: ")) {
630 ref->symref = xstrdup(buffer.buf + 5);
631 ret = 0;
632 } else
633 ret = 1;
634 } else {
635 ret = error("Couldn't get %s for %s\n%s",
636 url, ref->name, curl_errorstr);
637 }
638 } else {
639 ret = error("Unable to start request");
640 }
641
642 strbuf_release(&buffer);
643 free(url);
644 return ret;
645 }
git with Jakub Narębski modifications