Merge branch 'maint'
[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 const char *ssl_cert = NULL;
17 #if LIBCURL_VERSION_NUM >= 0x070902
18 static const char *ssl_key = NULL;
19 #endif
20 #if LIBCURL_VERSION_NUM >= 0x070908
21 static const char *ssl_capath = NULL;
22 #endif
23 static const 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, void *buffer_)
34 {
35         size_t size = eltsize * nmemb;
36         struct buffer *buffer = buffer_;
37
38         if (size > buffer->buf.len - buffer->posn)
39                 size = buffer->buf.len - buffer->posn;
40         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
41         buffer->posn += size;
42
43         return size;
44 }
45
46 size_t fwrite_buffer(const void *ptr, size_t eltsize, size_t nmemb, void *buffer_)
47 {
48         size_t size = eltsize * nmemb;
49         struct strbuf *buffer = buffer_;
50
51         strbuf_add(buffer, ptr, size);
52         data_received++;
53         return size;
54 }
55
56 size_t fwrite_null(const void *ptr, size_t eltsize, size_t nmemb, void *strbuf)
57 {
58         data_received++;
59         return eltsize * nmemb;
60 }
61
62 static void finish_active_slot(struct active_request_slot *slot);
63
64 #ifdef USE_CURL_MULTI
65 static void process_curl_messages(void)
66 {
67         int num_messages;
68         struct active_request_slot *slot;
69         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
70
71         while (curl_message != NULL) {
72                 if (curl_message->msg == CURLMSG_DONE) {
73                         int curl_result = curl_message->data.result;
74                         slot = active_queue_head;
75                         while (slot != NULL &&
76                                slot->curl != curl_message->easy_handle)
77                                 slot = slot->next;
78                         if (slot != NULL) {
79                                 curl_multi_remove_handle(curlm, slot->curl);
80                                 slot->curl_result = curl_result;
81                                 finish_active_slot(slot);
82                         } else {
83                                 fprintf(stderr, "Received DONE message for unknown request!\n");
84                         }
85                 } else {
86                         fprintf(stderr, "Unknown CURL message received: %d\n",
87                                 (int)curl_message->msg);
88                 }
89                 curl_message = curl_multi_info_read(curlm, &num_messages);
90         }
91 }
92 #endif
93
94 static int http_options(const char *var, const char *value, void *cb)
95 {
96         if (!strcmp("http.sslverify", var)) {
97                 if (curl_ssl_verify == -1) {
98                         curl_ssl_verify = git_config_bool(var, value);
99                 }
100                 return 0;
101         }
102
103         if (!strcmp("http.sslcert", var)) {
104                 if (ssl_cert == NULL)
105                         return git_config_string(&ssl_cert, var, value);
106                 return 0;
107         }
108 #if LIBCURL_VERSION_NUM >= 0x070902
109         if (!strcmp("http.sslkey", var)) {
110                 if (ssl_key == NULL)
111                         return git_config_string(&ssl_key, var, value);
112                 return 0;
113         }
114 #endif
115 #if LIBCURL_VERSION_NUM >= 0x070908
116         if (!strcmp("http.sslcapath", var)) {
117                 if (ssl_capath == NULL)
118                         return git_config_string(&ssl_capath, var, value);
119                 return 0;
120         }
121 #endif
122         if (!strcmp("http.sslcainfo", var)) {
123                 if (ssl_cainfo == NULL)
124                         return git_config_string(&ssl_cainfo, var, value);
125                 return 0;
126         }
127
128 #ifdef USE_CURL_MULTI
129         if (!strcmp("http.maxrequests", var)) {
130                 if (max_requests == -1)
131                         max_requests = git_config_int(var, value);
132                 return 0;
133         }
134 #endif
135
136         if (!strcmp("http.lowspeedlimit", var)) {
137                 if (curl_low_speed_limit == -1)
138                         curl_low_speed_limit = (long)git_config_int(var, value);
139                 return 0;
140         }
141         if (!strcmp("http.lowspeedtime", var)) {
142                 if (curl_low_speed_time == -1)
143                         curl_low_speed_time = (long)git_config_int(var, value);
144                 return 0;
145         }
146
147         if (!strcmp("http.noepsv", var)) {
148                 curl_ftp_no_epsv = git_config_bool(var, value);
149                 return 0;
150         }
151         if (!strcmp("http.proxy", var)) {
152                 if (curl_http_proxy == NULL) {
153                         if (!value)
154                                 return config_error_nonbool(var);
155                         curl_http_proxy = xstrdup(value);
156                 }
157                 return 0;
158         }
159
160         /* Fall back on the default ones */
161         return git_default_config(var, value, cb);
162 }
163
164 static CURL* get_curl_handle(void)
165 {
166         CURL* result = curl_easy_init();
167
168         if (!curl_ssl_verify) {
169                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
170                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
171         } else {
172                 /* Verify authenticity of the peer's certificate */
173                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
174                 /* The name in the cert must match whom we tried to connect */
175                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
176         }
177
178 #if LIBCURL_VERSION_NUM >= 0x070907
179         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
180 #endif
181
182         if (ssl_cert != NULL)
183                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
184 #if LIBCURL_VERSION_NUM >= 0x070902
185         if (ssl_key != NULL)
186                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
187 #endif
188 #if LIBCURL_VERSION_NUM >= 0x070908
189         if (ssl_capath != NULL)
190                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
191 #endif
192         if (ssl_cainfo != NULL)
193                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
194         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
195
196         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
197                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
198                                  curl_low_speed_limit);
199                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
200                                  curl_low_speed_time);
201         }
202
203         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
204
205         if (getenv("GIT_CURL_VERBOSE"))
206                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
207
208         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
209
210         if (curl_ftp_no_epsv)
211                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
212
213         if (curl_http_proxy)
214                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
215
216         return result;
217 }
218
219 void http_init(struct remote *remote)
220 {
221         char *low_speed_limit;
222         char *low_speed_time;
223
224         curl_global_init(CURL_GLOBAL_ALL);
225
226         if (remote && remote->http_proxy)
227                 curl_http_proxy = xstrdup(remote->http_proxy);
228
229         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
230
231 #ifdef USE_CURL_MULTI
232         {
233                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
234                 if (http_max_requests != NULL)
235                         max_requests = atoi(http_max_requests);
236         }
237
238         curlm = curl_multi_init();
239         if (curlm == NULL) {
240                 fprintf(stderr, "Error creating curl multi handle.\n");
241                 exit(1);
242         }
243 #endif
244
245         if (getenv("GIT_SSL_NO_VERIFY"))
246                 curl_ssl_verify = 0;
247
248         ssl_cert = getenv("GIT_SSL_CERT");
249 #if LIBCURL_VERSION_NUM >= 0x070902
250         ssl_key = getenv("GIT_SSL_KEY");
251 #endif
252 #if LIBCURL_VERSION_NUM >= 0x070908
253         ssl_capath = getenv("GIT_SSL_CAPATH");
254 #endif
255         ssl_cainfo = getenv("GIT_SSL_CAINFO");
256
257         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
258         if (low_speed_limit != NULL)
259                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
260         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
261         if (low_speed_time != NULL)
262                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
263
264         git_config(http_options, NULL);
265
266         if (curl_ssl_verify == -1)
267                 curl_ssl_verify = 1;
268
269 #ifdef USE_CURL_MULTI
270         if (max_requests < 1)
271                 max_requests = DEFAULT_MAX_REQUESTS;
272 #endif
273
274         if (getenv("GIT_CURL_FTP_NO_EPSV"))
275                 curl_ftp_no_epsv = 1;
276
277 #ifndef NO_CURL_EASY_DUPHANDLE
278         curl_default = get_curl_handle();
279 #endif
280 }
281
282 void http_cleanup(void)
283 {
284         struct active_request_slot *slot = active_queue_head;
285
286         while (slot != NULL) {
287                 struct active_request_slot *next = slot->next;
288                 if (slot->curl != NULL) {
289 #ifdef USE_CURL_MULTI
290                         curl_multi_remove_handle(curlm, slot->curl);
291 #endif
292                         curl_easy_cleanup(slot->curl);
293                 }
294                 free(slot);
295                 slot = next;
296         }
297         active_queue_head = NULL;
298
299 #ifndef NO_CURL_EASY_DUPHANDLE
300         curl_easy_cleanup(curl_default);
301 #endif
302
303 #ifdef USE_CURL_MULTI
304         curl_multi_cleanup(curlm);
305 #endif
306         curl_global_cleanup();
307
308         curl_slist_free_all(pragma_header);
309         pragma_header = NULL;
310
311         if (curl_http_proxy) {
312                 free(curl_http_proxy);
313                 curl_http_proxy = NULL;
314         }
315 }
316
317 struct active_request_slot *get_active_slot(void)
318 {
319         struct active_request_slot *slot = active_queue_head;
320         struct active_request_slot *newslot;
321
322 #ifdef USE_CURL_MULTI
323         int num_transfers;
324
325         /* Wait for a slot to open up if the queue is full */
326         while (active_requests >= max_requests) {
327                 curl_multi_perform(curlm, &num_transfers);
328                 if (num_transfers < active_requests) {
329                         process_curl_messages();
330                 }
331         }
332 #endif
333
334         while (slot != NULL && slot->in_use) {
335                 slot = slot->next;
336         }
337         if (slot == NULL) {
338                 newslot = xmalloc(sizeof(*newslot));
339                 newslot->curl = NULL;
340                 newslot->in_use = 0;
341                 newslot->next = NULL;
342
343                 slot = active_queue_head;
344                 if (slot == NULL) {
345                         active_queue_head = newslot;
346                 } else {
347                         while (slot->next != NULL) {
348                                 slot = slot->next;
349                         }
350                         slot->next = newslot;
351                 }
352                 slot = newslot;
353         }
354
355         if (slot->curl == NULL) {
356 #ifdef NO_CURL_EASY_DUPHANDLE
357                 slot->curl = get_curl_handle();
358 #else
359                 slot->curl = curl_easy_duphandle(curl_default);
360 #endif
361         }
362
363         active_requests++;
364         slot->in_use = 1;
365         slot->local = NULL;
366         slot->results = NULL;
367         slot->finished = NULL;
368         slot->callback_data = NULL;
369         slot->callback_func = NULL;
370         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
371         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
372         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
373         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
374         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
375         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
376         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
377
378         return slot;
379 }
380
381 int start_active_slot(struct active_request_slot *slot)
382 {
383 #ifdef USE_CURL_MULTI
384         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
385         int num_transfers;
386
387         if (curlm_result != CURLM_OK &&
388             curlm_result != CURLM_CALL_MULTI_PERFORM) {
389                 active_requests--;
390                 slot->in_use = 0;
391                 return 0;
392         }
393
394         /*
395          * We know there must be something to do, since we just added
396          * something.
397          */
398         curl_multi_perform(curlm, &num_transfers);
399 #endif
400         return 1;
401 }
402
403 #ifdef USE_CURL_MULTI
404 struct fill_chain {
405         void *data;
406         int (*fill)(void *);
407         struct fill_chain *next;
408 };
409
410 static struct fill_chain *fill_cfg = NULL;
411
412 void add_fill_function(void *data, int (*fill)(void *))
413 {
414         struct fill_chain *new = xmalloc(sizeof(*new));
415         struct fill_chain **linkp = &fill_cfg;
416         new->data = data;
417         new->fill = fill;
418         new->next = NULL;
419         while (*linkp)
420                 linkp = &(*linkp)->next;
421         *linkp = new;
422 }
423
424 void fill_active_slots(void)
425 {
426         struct active_request_slot *slot = active_queue_head;
427
428         while (active_requests < max_requests) {
429                 struct fill_chain *fill;
430                 for (fill = fill_cfg; fill; fill = fill->next)
431                         if (fill->fill(fill->data))
432                                 break;
433
434                 if (!fill)
435                         break;
436         }
437
438         while (slot != NULL) {
439                 if (!slot->in_use && slot->curl != NULL) {
440                         curl_easy_cleanup(slot->curl);
441                         slot->curl = NULL;
442                 }
443                 slot = slot->next;
444         }
445 }
446
447 void step_active_slots(void)
448 {
449         int num_transfers;
450         CURLMcode curlm_result;
451
452         do {
453                 curlm_result = curl_multi_perform(curlm, &num_transfers);
454         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
455         if (num_transfers < active_requests) {
456                 process_curl_messages();
457                 fill_active_slots();
458         }
459 }
460 #endif
461
462 void run_active_slot(struct active_request_slot *slot)
463 {
464 #ifdef USE_CURL_MULTI
465         long last_pos = 0;
466         long current_pos;
467         fd_set readfds;
468         fd_set writefds;
469         fd_set excfds;
470         int max_fd;
471         struct timeval select_timeout;
472         int finished = 0;
473
474         slot->finished = &finished;
475         while (!finished) {
476                 data_received = 0;
477                 step_active_slots();
478
479                 if (!data_received && slot->local != NULL) {
480                         current_pos = ftell(slot->local);
481                         if (current_pos > last_pos)
482                                 data_received++;
483                         last_pos = current_pos;
484                 }
485
486                 if (slot->in_use && !data_received) {
487                         max_fd = 0;
488                         FD_ZERO(&readfds);
489                         FD_ZERO(&writefds);
490                         FD_ZERO(&excfds);
491                         select_timeout.tv_sec = 0;
492                         select_timeout.tv_usec = 50000;
493                         select(max_fd, &readfds, &writefds,
494                                &excfds, &select_timeout);
495                 }
496         }
497 #else
498         while (slot->in_use) {
499                 slot->curl_result = curl_easy_perform(slot->curl);
500                 finish_active_slot(slot);
501         }
502 #endif
503 }
504
505 static void closedown_active_slot(struct active_request_slot *slot)
506 {
507         active_requests--;
508         slot->in_use = 0;
509 }
510
511 void release_active_slot(struct active_request_slot *slot)
512 {
513         closedown_active_slot(slot);
514         if (slot->curl) {
515 #ifdef USE_CURL_MULTI
516                 curl_multi_remove_handle(curlm, slot->curl);
517 #endif
518                 curl_easy_cleanup(slot->curl);
519                 slot->curl = NULL;
520         }
521 #ifdef USE_CURL_MULTI
522         fill_active_slots();
523 #endif
524 }
525
526 static void finish_active_slot(struct active_request_slot *slot)
527 {
528         closedown_active_slot(slot);
529         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
530
531         if (slot->finished != NULL)
532                 (*slot->finished) = 1;
533
534         /* Store slot results so they can be read after the slot is reused */
535         if (slot->results != NULL) {
536                 slot->results->curl_result = slot->curl_result;
537                 slot->results->http_code = slot->http_code;
538         }
539
540         /* Run callback if appropriate */
541         if (slot->callback_func != NULL) {
542                 slot->callback_func(slot->callback_data);
543         }
544 }
545
546 void finish_all_active_slots(void)
547 {
548         struct active_request_slot *slot = active_queue_head;
549
550         while (slot != NULL)
551                 if (slot->in_use) {
552                         run_active_slot(slot);
553                         slot = active_queue_head;
554                 } else {
555                         slot = slot->next;
556                 }
557 }
558
559 static inline int needs_quote(int ch)
560 {
561         if (((ch >= 'A') && (ch <= 'Z'))
562                         || ((ch >= 'a') && (ch <= 'z'))
563                         || ((ch >= '0') && (ch <= '9'))
564                         || (ch == '/')
565                         || (ch == '-')
566                         || (ch == '.'))
567                 return 0;
568         return 1;
569 }
570
571 static inline int hex(int v)
572 {
573         if (v < 10) return '0' + v;
574         else return 'A' + v - 10;
575 }
576
577 static char *quote_ref_url(const char *base, const char *ref)
578 {
579         const char *cp;
580         char *dp, *qref;
581         int len, baselen, ch;
582
583         baselen = strlen(base);
584         len = baselen + 2; /* '/' after base and terminating NUL */
585         for (cp = ref; (ch = *cp) != 0; cp++, len++)
586                 if (needs_quote(ch))
587                         len += 2; /* extra two hex plus replacement % */
588         qref = xmalloc(len);
589         memcpy(qref, base, baselen);
590         dp = qref + baselen;
591         *(dp++) = '/';
592         for (cp = ref; (ch = *cp) != 0; cp++) {
593                 if (needs_quote(ch)) {
594                         *dp++ = '%';
595                         *dp++ = hex((ch >> 4) & 0xF);
596                         *dp++ = hex(ch & 0xF);
597                 }
598                 else
599                         *dp++ = ch;
600         }
601         *dp = 0;
602
603         return qref;
604 }
605
606 int http_fetch_ref(const char *base, struct ref *ref)
607 {
608         char *url;
609         struct strbuf buffer = STRBUF_INIT;
610         struct active_request_slot *slot;
611         struct slot_results results;
612         int ret;
613
614         url = quote_ref_url(base, ref->name);
615         slot = get_active_slot();
616         slot->results = &results;
617         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
618         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
619         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
620         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
621         if (start_active_slot(slot)) {
622                 run_active_slot(slot);
623                 if (results.curl_result == CURLE_OK) {
624                         strbuf_rtrim(&buffer);
625                         if (buffer.len == 40)
626                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
627                         else if (!prefixcmp(buffer.buf, "ref: ")) {
628                                 ref->symref = xstrdup(buffer.buf + 5);
629                                 ret = 0;
630                         } else
631                                 ret = 1;
632                 } else {
633                         ret = error("Couldn't get %s for %s\n%s",
634                                     url, ref->name, curl_errorstr);
635                 }
636         } else {
637                 ret = error("Unable to start request");
638         }
639
640         strbuf_release(&buffer);
641         free(url);
642         return ret;
643 }