Merge branch 'jc/diff-relative'
[git] / http.c
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(void)
222 {
223         char *low_speed_limit;
224         char *low_speed_time;
225
226         curl_global_init(CURL_GLOBAL_ALL);
227
228         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
229
230 #ifdef USE_CURL_MULTI
231         {
232                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
233                 if (http_max_requests != NULL)
234                         max_requests = atoi(http_max_requests);
235         }
236
237         curlm = curl_multi_init();
238         if (curlm == NULL) {
239                 fprintf(stderr, "Error creating curl multi handle.\n");
240                 exit(1);
241         }
242 #endif
243
244         if (getenv("GIT_SSL_NO_VERIFY"))
245                 curl_ssl_verify = 0;
246
247         ssl_cert = getenv("GIT_SSL_CERT");
248 #if LIBCURL_VERSION_NUM >= 0x070902
249         ssl_key = getenv("GIT_SSL_KEY");
250 #endif
251 #if LIBCURL_VERSION_NUM >= 0x070908
252         ssl_capath = getenv("GIT_SSL_CAPATH");
253 #endif
254         ssl_cainfo = getenv("GIT_SSL_CAINFO");
255
256         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
257         if (low_speed_limit != NULL)
258                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
259         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
260         if (low_speed_time != NULL)
261                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
262
263         git_config(http_options);
264
265         if (curl_ssl_verify == -1)
266                 curl_ssl_verify = 1;
267
268 #ifdef USE_CURL_MULTI
269         if (max_requests < 1)
270                 max_requests = DEFAULT_MAX_REQUESTS;
271 #endif
272
273         if (getenv("GIT_CURL_FTP_NO_EPSV"))
274                 curl_ftp_no_epsv = 1;
275
276 #ifndef NO_CURL_EASY_DUPHANDLE
277         curl_default = get_curl_handle();
278 #endif
279 }
280
281 void http_cleanup(void)
282 {
283         struct active_request_slot *slot = active_queue_head;
284 #ifdef USE_CURL_MULTI
285         char *wait_url;
286 #endif
287
288         while (slot != NULL) {
289                 struct active_request_slot *next = slot->next;
290 #ifdef USE_CURL_MULTI
291                 if (slot->in_use) {
292                         curl_easy_getinfo(slot->curl,
293                                           CURLINFO_EFFECTIVE_URL,
294                                           &wait_url);
295                         fprintf(stderr, "Waiting for %s\n", wait_url);
296                         run_active_slot(slot);
297                 }
298 #endif
299                 if (slot->curl != NULL)
300                         curl_easy_cleanup(slot->curl);
301                 free(slot);
302                 slot = next;
303         }
304         active_queue_head = NULL;
305
306 #ifndef NO_CURL_EASY_DUPHANDLE
307         curl_easy_cleanup(curl_default);
308 #endif
309
310 #ifdef USE_CURL_MULTI
311         curl_multi_cleanup(curlm);
312 #endif
313         curl_global_cleanup();
314
315         curl_slist_free_all(pragma_header);
316         pragma_header = NULL;
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         memcpy(qref + baselen, "/refs/", 6);
593         for (cp = ref, dp = qref + baselen + 6; (ch = *cp) != 0; cp++) {
594                 if (needs_quote(ch)) {
595                         *dp++ = '%';
596                         *dp++ = hex((ch >> 4) & 0xF);
597                         *dp++ = hex(ch & 0xF);
598                 }
599                 else
600                         *dp++ = ch;
601         }
602         *dp = 0;
603
604         return qref;
605 }
606
607 int http_fetch_ref(const char *base, const char *ref, unsigned char *sha1)
608 {
609         char *url;
610         struct strbuf buffer = STRBUF_INIT;
611         struct active_request_slot *slot;
612         struct slot_results results;
613         int ret;
614
615         url = quote_ref_url(base, ref);
616         slot = get_active_slot();
617         slot->results = &results;
618         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
619         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
620         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
621         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
622         if (start_active_slot(slot)) {
623                 run_active_slot(slot);
624                 if (results.curl_result == CURLE_OK) {
625                         strbuf_rtrim(&buffer);
626                         if (buffer.len == 40)
627                                 ret = get_sha1_hex(buffer.buf, sha1);
628                         else
629                                 ret = 1;
630                 } else {
631                         ret = error("Couldn't get %s for %s\n%s",
632                                     url, ref, curl_errorstr);
633                 }
634         } else {
635                 ret = error("Unable to start request");
636         }
637
638         strbuf_release(&buffer);
639         free(url);
640         return ret;
641 }