Merge branch 'jc/maint-1.6.0-diff-borrow-carefully' into 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 const 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                         return git_config_string(&curl_http_proxy, var, value);
154                 return 0;
155         }
156
157         /* Fall back on the default ones */
158         return git_default_config(var, value, cb);
159 }
160
161 static CURL* get_curl_handle(void)
162 {
163         CURL* result = curl_easy_init();
164
165         if (!curl_ssl_verify) {
166                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
167                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
168         } else {
169                 /* Verify authenticity of the peer's certificate */
170                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
171                 /* The name in the cert must match whom we tried to connect */
172                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
173         }
174
175 #if LIBCURL_VERSION_NUM >= 0x070907
176         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
177 #endif
178
179         if (ssl_cert != NULL)
180                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
181 #if LIBCURL_VERSION_NUM >= 0x070902
182         if (ssl_key != NULL)
183                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
184 #endif
185 #if LIBCURL_VERSION_NUM >= 0x070908
186         if (ssl_capath != NULL)
187                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
188 #endif
189         if (ssl_cainfo != NULL)
190                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
191         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
192
193         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
194                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
195                                  curl_low_speed_limit);
196                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
197                                  curl_low_speed_time);
198         }
199
200         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
201
202         if (getenv("GIT_CURL_VERBOSE"))
203                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
204
205         curl_easy_setopt(result, CURLOPT_USERAGENT, GIT_USER_AGENT);
206
207         if (curl_ftp_no_epsv)
208                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
209
210         if (curl_http_proxy)
211                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
212
213         return result;
214 }
215
216 void http_init(struct remote *remote)
217 {
218         char *low_speed_limit;
219         char *low_speed_time;
220
221         curl_global_init(CURL_GLOBAL_ALL);
222
223         if (remote && remote->http_proxy)
224                 curl_http_proxy = xstrdup(remote->http_proxy);
225
226         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
227
228 #ifdef USE_CURL_MULTI
229         {
230                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
231                 if (http_max_requests != NULL)
232                         max_requests = atoi(http_max_requests);
233         }
234
235         curlm = curl_multi_init();
236         if (curlm == NULL) {
237                 fprintf(stderr, "Error creating curl multi handle.\n");
238                 exit(1);
239         }
240 #endif
241
242         if (getenv("GIT_SSL_NO_VERIFY"))
243                 curl_ssl_verify = 0;
244
245         ssl_cert = getenv("GIT_SSL_CERT");
246 #if LIBCURL_VERSION_NUM >= 0x070902
247         ssl_key = getenv("GIT_SSL_KEY");
248 #endif
249 #if LIBCURL_VERSION_NUM >= 0x070908
250         ssl_capath = getenv("GIT_SSL_CAPATH");
251 #endif
252         ssl_cainfo = getenv("GIT_SSL_CAINFO");
253
254         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
255         if (low_speed_limit != NULL)
256                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
257         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
258         if (low_speed_time != NULL)
259                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
260
261         git_config(http_options, NULL);
262
263         if (curl_ssl_verify == -1)
264                 curl_ssl_verify = 1;
265
266 #ifdef USE_CURL_MULTI
267         if (max_requests < 1)
268                 max_requests = DEFAULT_MAX_REQUESTS;
269 #endif
270
271         if (getenv("GIT_CURL_FTP_NO_EPSV"))
272                 curl_ftp_no_epsv = 1;
273
274 #ifndef NO_CURL_EASY_DUPHANDLE
275         curl_default = get_curl_handle();
276 #endif
277 }
278
279 void http_cleanup(void)
280 {
281         struct active_request_slot *slot = active_queue_head;
282
283         while (slot != NULL) {
284                 struct active_request_slot *next = slot->next;
285                 if (slot->curl != NULL) {
286 #ifdef USE_CURL_MULTI
287                         curl_multi_remove_handle(curlm, slot->curl);
288 #endif
289                         curl_easy_cleanup(slot->curl);
290                 }
291                 free(slot);
292                 slot = next;
293         }
294         active_queue_head = NULL;
295
296 #ifndef NO_CURL_EASY_DUPHANDLE
297         curl_easy_cleanup(curl_default);
298 #endif
299
300 #ifdef USE_CURL_MULTI
301         curl_multi_cleanup(curlm);
302 #endif
303         curl_global_cleanup();
304
305         curl_slist_free_all(pragma_header);
306         pragma_header = NULL;
307
308         if (curl_http_proxy) {
309                 free((void *)curl_http_proxy);
310                 curl_http_proxy = NULL;
311         }
312 }
313
314 struct active_request_slot *get_active_slot(void)
315 {
316         struct active_request_slot *slot = active_queue_head;
317         struct active_request_slot *newslot;
318
319 #ifdef USE_CURL_MULTI
320         int num_transfers;
321
322         /* Wait for a slot to open up if the queue is full */
323         while (active_requests >= max_requests) {
324                 curl_multi_perform(curlm, &num_transfers);
325                 if (num_transfers < active_requests) {
326                         process_curl_messages();
327                 }
328         }
329 #endif
330
331         while (slot != NULL && slot->in_use) {
332                 slot = slot->next;
333         }
334         if (slot == NULL) {
335                 newslot = xmalloc(sizeof(*newslot));
336                 newslot->curl = NULL;
337                 newslot->in_use = 0;
338                 newslot->next = NULL;
339
340                 slot = active_queue_head;
341                 if (slot == NULL) {
342                         active_queue_head = newslot;
343                 } else {
344                         while (slot->next != NULL) {
345                                 slot = slot->next;
346                         }
347                         slot->next = newslot;
348                 }
349                 slot = newslot;
350         }
351
352         if (slot->curl == NULL) {
353 #ifdef NO_CURL_EASY_DUPHANDLE
354                 slot->curl = get_curl_handle();
355 #else
356                 slot->curl = curl_easy_duphandle(curl_default);
357 #endif
358         }
359
360         active_requests++;
361         slot->in_use = 1;
362         slot->local = NULL;
363         slot->results = NULL;
364         slot->finished = NULL;
365         slot->callback_data = NULL;
366         slot->callback_func = NULL;
367         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
368         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
369         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
370         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
371         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
372         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
373         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
374
375         return slot;
376 }
377
378 int start_active_slot(struct active_request_slot *slot)
379 {
380 #ifdef USE_CURL_MULTI
381         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
382         int num_transfers;
383
384         if (curlm_result != CURLM_OK &&
385             curlm_result != CURLM_CALL_MULTI_PERFORM) {
386                 active_requests--;
387                 slot->in_use = 0;
388                 return 0;
389         }
390
391         /*
392          * We know there must be something to do, since we just added
393          * something.
394          */
395         curl_multi_perform(curlm, &num_transfers);
396 #endif
397         return 1;
398 }
399
400 #ifdef USE_CURL_MULTI
401 struct fill_chain {
402         void *data;
403         int (*fill)(void *);
404         struct fill_chain *next;
405 };
406
407 static struct fill_chain *fill_cfg = NULL;
408
409 void add_fill_function(void *data, int (*fill)(void *))
410 {
411         struct fill_chain *new = xmalloc(sizeof(*new));
412         struct fill_chain **linkp = &fill_cfg;
413         new->data = data;
414         new->fill = fill;
415         new->next = NULL;
416         while (*linkp)
417                 linkp = &(*linkp)->next;
418         *linkp = new;
419 }
420
421 void fill_active_slots(void)
422 {
423         struct active_request_slot *slot = active_queue_head;
424
425         while (active_requests < max_requests) {
426                 struct fill_chain *fill;
427                 for (fill = fill_cfg; fill; fill = fill->next)
428                         if (fill->fill(fill->data))
429                                 break;
430
431                 if (!fill)
432                         break;
433         }
434
435         while (slot != NULL) {
436                 if (!slot->in_use && slot->curl != NULL) {
437                         curl_easy_cleanup(slot->curl);
438                         slot->curl = NULL;
439                 }
440                 slot = slot->next;
441         }
442 }
443
444 void step_active_slots(void)
445 {
446         int num_transfers;
447         CURLMcode curlm_result;
448
449         do {
450                 curlm_result = curl_multi_perform(curlm, &num_transfers);
451         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
452         if (num_transfers < active_requests) {
453                 process_curl_messages();
454                 fill_active_slots();
455         }
456 }
457 #endif
458
459 void run_active_slot(struct active_request_slot *slot)
460 {
461 #ifdef USE_CURL_MULTI
462         long last_pos = 0;
463         long current_pos;
464         fd_set readfds;
465         fd_set writefds;
466         fd_set excfds;
467         int max_fd;
468         struct timeval select_timeout;
469         int finished = 0;
470
471         slot->finished = &finished;
472         while (!finished) {
473                 data_received = 0;
474                 step_active_slots();
475
476                 if (!data_received && slot->local != NULL) {
477                         current_pos = ftell(slot->local);
478                         if (current_pos > last_pos)
479                                 data_received++;
480                         last_pos = current_pos;
481                 }
482
483                 if (slot->in_use && !data_received) {
484                         max_fd = 0;
485                         FD_ZERO(&readfds);
486                         FD_ZERO(&writefds);
487                         FD_ZERO(&excfds);
488                         select_timeout.tv_sec = 0;
489                         select_timeout.tv_usec = 50000;
490                         select(max_fd, &readfds, &writefds,
491                                &excfds, &select_timeout);
492                 }
493         }
494 #else
495         while (slot->in_use) {
496                 slot->curl_result = curl_easy_perform(slot->curl);
497                 finish_active_slot(slot);
498         }
499 #endif
500 }
501
502 static void closedown_active_slot(struct active_request_slot *slot)
503 {
504         active_requests--;
505         slot->in_use = 0;
506 }
507
508 void release_active_slot(struct active_request_slot *slot)
509 {
510         closedown_active_slot(slot);
511         if (slot->curl) {
512 #ifdef USE_CURL_MULTI
513                 curl_multi_remove_handle(curlm, slot->curl);
514 #endif
515                 curl_easy_cleanup(slot->curl);
516                 slot->curl = NULL;
517         }
518 #ifdef USE_CURL_MULTI
519         fill_active_slots();
520 #endif
521 }
522
523 static void finish_active_slot(struct active_request_slot *slot)
524 {
525         closedown_active_slot(slot);
526         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
527
528         if (slot->finished != NULL)
529                 (*slot->finished) = 1;
530
531         /* Store slot results so they can be read after the slot is reused */
532         if (slot->results != NULL) {
533                 slot->results->curl_result = slot->curl_result;
534                 slot->results->http_code = slot->http_code;
535         }
536
537         /* Run callback if appropriate */
538         if (slot->callback_func != NULL) {
539                 slot->callback_func(slot->callback_data);
540         }
541 }
542
543 void finish_all_active_slots(void)
544 {
545         struct active_request_slot *slot = active_queue_head;
546
547         while (slot != NULL)
548                 if (slot->in_use) {
549                         run_active_slot(slot);
550                         slot = active_queue_head;
551                 } else {
552                         slot = slot->next;
553                 }
554 }
555
556 static inline int needs_quote(int ch)
557 {
558         if (((ch >= 'A') && (ch <= 'Z'))
559                         || ((ch >= 'a') && (ch <= 'z'))
560                         || ((ch >= '0') && (ch <= '9'))
561                         || (ch == '/')
562                         || (ch == '-')
563                         || (ch == '.'))
564                 return 0;
565         return 1;
566 }
567
568 static inline int hex(int v)
569 {
570         if (v < 10) return '0' + v;
571         else return 'A' + v - 10;
572 }
573
574 static char *quote_ref_url(const char *base, const char *ref)
575 {
576         const char *cp;
577         char *dp, *qref;
578         int len, baselen, ch;
579
580         baselen = strlen(base);
581         len = baselen + 2; /* '/' after base and terminating NUL */
582         for (cp = ref; (ch = *cp) != 0; cp++, len++)
583                 if (needs_quote(ch))
584                         len += 2; /* extra two hex plus replacement % */
585         qref = xmalloc(len);
586         memcpy(qref, base, baselen);
587         dp = qref + baselen;
588         *(dp++) = '/';
589         for (cp = ref; (ch = *cp) != 0; cp++) {
590                 if (needs_quote(ch)) {
591                         *dp++ = '%';
592                         *dp++ = hex((ch >> 4) & 0xF);
593                         *dp++ = hex(ch & 0xF);
594                 }
595                 else
596                         *dp++ = ch;
597         }
598         *dp = 0;
599
600         return qref;
601 }
602
603 int http_fetch_ref(const char *base, struct ref *ref)
604 {
605         char *url;
606         struct strbuf buffer = STRBUF_INIT;
607         struct active_request_slot *slot;
608         struct slot_results results;
609         int ret;
610
611         url = quote_ref_url(base, ref->name);
612         slot = get_active_slot();
613         slot->results = &results;
614         curl_easy_setopt(slot->curl, CURLOPT_FILE, &buffer);
615         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, fwrite_buffer);
616         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, NULL);
617         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
618         if (start_active_slot(slot)) {
619                 run_active_slot(slot);
620                 if (results.curl_result == CURLE_OK) {
621                         strbuf_rtrim(&buffer);
622                         if (buffer.len == 40)
623                                 ret = get_sha1_hex(buffer.buf, ref->old_sha1);
624                         else if (!prefixcmp(buffer.buf, "ref: ")) {
625                                 ref->symref = xstrdup(buffer.buf + 5);
626                                 ret = 0;
627                         } else
628                                 ret = 1;
629                 } else {
630                         ret = error("Couldn't get %s for %s\n%s",
631                                     url, ref->name, curl_errorstr);
632                 }
633         } else {
634                 ret = error("Unable to start request");
635         }
636
637         strbuf_release(&buffer);
638         free(url);
639         return ret;
640 }