Merge branch 'cb/httpd-test-fix-port'
[git] / http.c
1 #include "http.h"
2 #include "pack.h"
3 #include "sideband.h"
4 #include "run-command.h"
5 #include "url.h"
6
7 int data_received;
8 int active_requests;
9 int http_is_verbose;
10 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
11
12 #if LIBCURL_VERSION_NUM >= 0x070a06
13 #define LIBCURL_CAN_HANDLE_AUTH_ANY
14 #endif
15
16 static int min_curl_sessions = 1;
17 static int curl_session_count;
18 #ifdef USE_CURL_MULTI
19 static int max_requests = -1;
20 static CURLM *curlm;
21 #endif
22 #ifndef NO_CURL_EASY_DUPHANDLE
23 static CURL *curl_default;
24 #endif
25
26 #define PREV_BUF_SIZE 4096
27 #define RANGE_HEADER_SIZE 30
28
29 char curl_errorstr[CURL_ERROR_SIZE];
30
31 static int curl_ssl_verify = -1;
32 static const char *ssl_cert;
33 #if LIBCURL_VERSION_NUM >= 0x070903
34 static const char *ssl_key;
35 #endif
36 #if LIBCURL_VERSION_NUM >= 0x070908
37 static const char *ssl_capath;
38 #endif
39 static const char *ssl_cainfo;
40 static long curl_low_speed_limit = -1;
41 static long curl_low_speed_time = -1;
42 static int curl_ftp_no_epsv;
43 static const char *curl_http_proxy;
44 static const char *curl_cookie_file;
45 static char *user_name, *user_pass, *description;
46 static const char *user_agent;
47
48 #if LIBCURL_VERSION_NUM >= 0x071700
49 /* Use CURLOPT_KEYPASSWD as is */
50 #elif LIBCURL_VERSION_NUM >= 0x070903
51 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
52 #else
53 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
54 #endif
55
56 static char *ssl_cert_password;
57 static int ssl_cert_password_required;
58
59 static struct curl_slist *pragma_header;
60 static struct curl_slist *no_pragma_header;
61
62 static struct active_request_slot *active_queue_head;
63
64 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
65 {
66         size_t size = eltsize * nmemb;
67         struct buffer *buffer = buffer_;
68
69         if (size > buffer->buf.len - buffer->posn)
70                 size = buffer->buf.len - buffer->posn;
71         memcpy(ptr, buffer->buf.buf + buffer->posn, size);
72         buffer->posn += size;
73
74         return size;
75 }
76
77 #ifndef NO_CURL_IOCTL
78 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
79 {
80         struct buffer *buffer = clientp;
81
82         switch (cmd) {
83         case CURLIOCMD_NOP:
84                 return CURLIOE_OK;
85
86         case CURLIOCMD_RESTARTREAD:
87                 buffer->posn = 0;
88                 return CURLIOE_OK;
89
90         default:
91                 return CURLIOE_UNKNOWNCMD;
92         }
93 }
94 #endif
95
96 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
97 {
98         size_t size = eltsize * nmemb;
99         struct strbuf *buffer = buffer_;
100
101         strbuf_add(buffer, ptr, size);
102         data_received++;
103         return size;
104 }
105
106 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
107 {
108         data_received++;
109         return eltsize * nmemb;
110 }
111
112 #ifdef USE_CURL_MULTI
113 static void process_curl_messages(void)
114 {
115         int num_messages;
116         struct active_request_slot *slot;
117         CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
118
119         while (curl_message != NULL) {
120                 if (curl_message->msg == CURLMSG_DONE) {
121                         int curl_result = curl_message->data.result;
122                         slot = active_queue_head;
123                         while (slot != NULL &&
124                                slot->curl != curl_message->easy_handle)
125                                 slot = slot->next;
126                         if (slot != NULL) {
127                                 curl_multi_remove_handle(curlm, slot->curl);
128                                 slot->curl_result = curl_result;
129                                 finish_active_slot(slot);
130                         } else {
131                                 fprintf(stderr, "Received DONE message for unknown request!\n");
132                         }
133                 } else {
134                         fprintf(stderr, "Unknown CURL message received: %d\n",
135                                 (int)curl_message->msg);
136                 }
137                 curl_message = curl_multi_info_read(curlm, &num_messages);
138         }
139 }
140 #endif
141
142 static char *git_getpass_with_description(const char *what, const char *desc)
143 {
144         struct strbuf prompt = STRBUF_INIT;
145         char *r;
146
147         if (desc)
148                 strbuf_addf(&prompt, "%s for '%s': ", what, desc);
149         else
150                 strbuf_addf(&prompt, "%s: ", what);
151         /*
152          * NEEDSWORK: for usernames, we should do something less magical that
153          * actually echoes the characters. However, we need to read from
154          * /dev/tty and not stdio, which is not portable (but getpass will do
155          * it for us). http.c uses the same workaround.
156          */
157         r = git_getpass(prompt.buf);
158
159         strbuf_release(&prompt);
160         return xstrdup(r);
161 }
162
163 static int http_options(const char *var, const char *value, void *cb)
164 {
165         if (!strcmp("http.sslverify", var)) {
166                 curl_ssl_verify = git_config_bool(var, value);
167                 return 0;
168         }
169         if (!strcmp("http.sslcert", var))
170                 return git_config_string(&ssl_cert, var, value);
171 #if LIBCURL_VERSION_NUM >= 0x070903
172         if (!strcmp("http.sslkey", var))
173                 return git_config_string(&ssl_key, var, value);
174 #endif
175 #if LIBCURL_VERSION_NUM >= 0x070908
176         if (!strcmp("http.sslcapath", var))
177                 return git_config_string(&ssl_capath, var, value);
178 #endif
179         if (!strcmp("http.sslcainfo", var))
180                 return git_config_string(&ssl_cainfo, var, value);
181         if (!strcmp("http.sslcertpasswordprotected", var)) {
182                 if (git_config_bool(var, value))
183                         ssl_cert_password_required = 1;
184                 return 0;
185         }
186         if (!strcmp("http.minsessions", var)) {
187                 min_curl_sessions = git_config_int(var, value);
188 #ifndef USE_CURL_MULTI
189                 if (min_curl_sessions > 1)
190                         min_curl_sessions = 1;
191 #endif
192                 return 0;
193         }
194 #ifdef USE_CURL_MULTI
195         if (!strcmp("http.maxrequests", var)) {
196                 max_requests = git_config_int(var, value);
197                 return 0;
198         }
199 #endif
200         if (!strcmp("http.lowspeedlimit", var)) {
201                 curl_low_speed_limit = (long)git_config_int(var, value);
202                 return 0;
203         }
204         if (!strcmp("http.lowspeedtime", var)) {
205                 curl_low_speed_time = (long)git_config_int(var, value);
206                 return 0;
207         }
208
209         if (!strcmp("http.noepsv", var)) {
210                 curl_ftp_no_epsv = git_config_bool(var, value);
211                 return 0;
212         }
213         if (!strcmp("http.proxy", var))
214                 return git_config_string(&curl_http_proxy, var, value);
215
216         if (!strcmp("http.cookiefile", var))
217                 return git_config_string(&curl_cookie_file, var, value);
218
219         if (!strcmp("http.postbuffer", var)) {
220                 http_post_buffer = git_config_int(var, value);
221                 if (http_post_buffer < LARGE_PACKET_MAX)
222                         http_post_buffer = LARGE_PACKET_MAX;
223                 return 0;
224         }
225
226         if (!strcmp("http.useragent", var))
227                 return git_config_string(&user_agent, var, value);
228
229         /* Fall back on the default ones */
230         return git_default_config(var, value, cb);
231 }
232
233 static void init_curl_http_auth(CURL *result)
234 {
235         if (user_name) {
236                 struct strbuf up = STRBUF_INIT;
237                 if (!user_pass)
238                         user_pass = xstrdup(git_getpass_with_description("Password", description));
239                 strbuf_addf(&up, "%s:%s", user_name, user_pass);
240                 curl_easy_setopt(result, CURLOPT_USERPWD,
241                                  strbuf_detach(&up, NULL));
242         }
243 }
244
245 static int has_cert_password(void)
246 {
247         if (ssl_cert_password != NULL)
248                 return 1;
249         if (ssl_cert == NULL || ssl_cert_password_required != 1)
250                 return 0;
251         /* Only prompt the user once. */
252         ssl_cert_password_required = -1;
253         ssl_cert_password = git_getpass_with_description("Certificate Password", description);
254         if (ssl_cert_password != NULL) {
255                 ssl_cert_password = xstrdup(ssl_cert_password);
256                 return 1;
257         } else
258                 return 0;
259 }
260
261 static CURL *get_curl_handle(void)
262 {
263         CURL *result = curl_easy_init();
264
265         if (!curl_ssl_verify) {
266                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
267                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
268         } else {
269                 /* Verify authenticity of the peer's certificate */
270                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
271                 /* The name in the cert must match whom we tried to connect */
272                 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
273         }
274
275 #if LIBCURL_VERSION_NUM >= 0x070907
276         curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
277 #endif
278 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
279         curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
280 #endif
281
282         init_curl_http_auth(result);
283
284         if (ssl_cert != NULL)
285                 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
286         if (has_cert_password())
287                 curl_easy_setopt(result, CURLOPT_KEYPASSWD, ssl_cert_password);
288 #if LIBCURL_VERSION_NUM >= 0x070903
289         if (ssl_key != NULL)
290                 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
291 #endif
292 #if LIBCURL_VERSION_NUM >= 0x070908
293         if (ssl_capath != NULL)
294                 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
295 #endif
296         if (ssl_cainfo != NULL)
297                 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
298         curl_easy_setopt(result, CURLOPT_FAILONERROR, 1);
299
300         if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
301                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
302                                  curl_low_speed_limit);
303                 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
304                                  curl_low_speed_time);
305         }
306
307         curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
308 #if LIBCURL_VERSION_NUM >= 0x071301
309         curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
310 #elif LIBCURL_VERSION_NUM >= 0x071101
311         curl_easy_setopt(result, CURLOPT_POST301, 1);
312 #endif
313
314         if (getenv("GIT_CURL_VERBOSE"))
315                 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
316
317         curl_easy_setopt(result, CURLOPT_USERAGENT,
318                 user_agent ? user_agent : GIT_HTTP_USER_AGENT);
319
320         if (curl_ftp_no_epsv)
321                 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
322
323         if (curl_http_proxy)
324                 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
325
326         return result;
327 }
328
329 static void http_auth_init(const char *url)
330 {
331         const char *at, *colon, *cp, *slash, *host;
332
333         cp = strstr(url, "://");
334         if (!cp)
335                 return;
336
337         /*
338          * Ok, the URL looks like "proto://something".  Which one?
339          * "proto://<user>:<pass>@<host>/...",
340          * "proto://<user>@<host>/...", or just
341          * "proto://<host>/..."?
342          */
343         cp += 3;
344         at = strchr(cp, '@');
345         colon = strchr(cp, ':');
346         slash = strchrnul(cp, '/');
347         if (!at || slash <= at) {
348                 /* No credentials, but we may have to ask for some later */
349                 host = cp;
350         }
351         else if (!colon || at <= colon) {
352                 /* Only username */
353                 user_name = url_decode_mem(cp, at - cp);
354                 user_pass = NULL;
355                 host = at + 1;
356         } else {
357                 user_name = url_decode_mem(cp, colon - cp);
358                 user_pass = url_decode_mem(colon + 1, at - (colon + 1));
359                 host = at + 1;
360         }
361
362         description = url_decode_mem(host, slash - host);
363 }
364
365 static void set_from_env(const char **var, const char *envname)
366 {
367         const char *val = getenv(envname);
368         if (val)
369                 *var = val;
370 }
371
372 void http_init(struct remote *remote, const char *url)
373 {
374         char *low_speed_limit;
375         char *low_speed_time;
376
377         http_is_verbose = 0;
378
379         git_config(http_options, NULL);
380
381         curl_global_init(CURL_GLOBAL_ALL);
382
383         if (remote && remote->http_proxy)
384                 curl_http_proxy = xstrdup(remote->http_proxy);
385
386         pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
387         no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
388
389 #ifdef USE_CURL_MULTI
390         {
391                 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
392                 if (http_max_requests != NULL)
393                         max_requests = atoi(http_max_requests);
394         }
395
396         curlm = curl_multi_init();
397         if (curlm == NULL) {
398                 fprintf(stderr, "Error creating curl multi handle.\n");
399                 exit(1);
400         }
401 #endif
402
403         if (getenv("GIT_SSL_NO_VERIFY"))
404                 curl_ssl_verify = 0;
405
406         set_from_env(&ssl_cert, "GIT_SSL_CERT");
407 #if LIBCURL_VERSION_NUM >= 0x070903
408         set_from_env(&ssl_key, "GIT_SSL_KEY");
409 #endif
410 #if LIBCURL_VERSION_NUM >= 0x070908
411         set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
412 #endif
413         set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
414
415         set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
416
417         low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
418         if (low_speed_limit != NULL)
419                 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
420         low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
421         if (low_speed_time != NULL)
422                 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
423
424         if (curl_ssl_verify == -1)
425                 curl_ssl_verify = 1;
426
427         curl_session_count = 0;
428 #ifdef USE_CURL_MULTI
429         if (max_requests < 1)
430                 max_requests = DEFAULT_MAX_REQUESTS;
431 #endif
432
433         if (getenv("GIT_CURL_FTP_NO_EPSV"))
434                 curl_ftp_no_epsv = 1;
435
436         if (url) {
437                 http_auth_init(url);
438                 if (!ssl_cert_password_required &&
439                     getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
440                     !prefixcmp(url, "https://"))
441                         ssl_cert_password_required = 1;
442         }
443
444 #ifndef NO_CURL_EASY_DUPHANDLE
445         curl_default = get_curl_handle();
446 #endif
447 }
448
449 void http_cleanup(void)
450 {
451         struct active_request_slot *slot = active_queue_head;
452
453         while (slot != NULL) {
454                 struct active_request_slot *next = slot->next;
455                 if (slot->curl != NULL) {
456 #ifdef USE_CURL_MULTI
457                         curl_multi_remove_handle(curlm, slot->curl);
458 #endif
459                         curl_easy_cleanup(slot->curl);
460                 }
461                 free(slot);
462                 slot = next;
463         }
464         active_queue_head = NULL;
465
466 #ifndef NO_CURL_EASY_DUPHANDLE
467         curl_easy_cleanup(curl_default);
468 #endif
469
470 #ifdef USE_CURL_MULTI
471         curl_multi_cleanup(curlm);
472 #endif
473         curl_global_cleanup();
474
475         curl_slist_free_all(pragma_header);
476         pragma_header = NULL;
477
478         curl_slist_free_all(no_pragma_header);
479         no_pragma_header = NULL;
480
481         if (curl_http_proxy) {
482                 free((void *)curl_http_proxy);
483                 curl_http_proxy = NULL;
484         }
485
486         if (ssl_cert_password != NULL) {
487                 memset(ssl_cert_password, 0, strlen(ssl_cert_password));
488                 free(ssl_cert_password);
489                 ssl_cert_password = NULL;
490         }
491         ssl_cert_password_required = 0;
492 }
493
494 struct active_request_slot *get_active_slot(void)
495 {
496         struct active_request_slot *slot = active_queue_head;
497         struct active_request_slot *newslot;
498
499 #ifdef USE_CURL_MULTI
500         int num_transfers;
501
502         /* Wait for a slot to open up if the queue is full */
503         while (active_requests >= max_requests) {
504                 curl_multi_perform(curlm, &num_transfers);
505                 if (num_transfers < active_requests)
506                         process_curl_messages();
507         }
508 #endif
509
510         while (slot != NULL && slot->in_use)
511                 slot = slot->next;
512
513         if (slot == NULL) {
514                 newslot = xmalloc(sizeof(*newslot));
515                 newslot->curl = NULL;
516                 newslot->in_use = 0;
517                 newslot->next = NULL;
518
519                 slot = active_queue_head;
520                 if (slot == NULL) {
521                         active_queue_head = newslot;
522                 } else {
523                         while (slot->next != NULL)
524                                 slot = slot->next;
525                         slot->next = newslot;
526                 }
527                 slot = newslot;
528         }
529
530         if (slot->curl == NULL) {
531 #ifdef NO_CURL_EASY_DUPHANDLE
532                 slot->curl = get_curl_handle();
533 #else
534                 slot->curl = curl_easy_duphandle(curl_default);
535 #endif
536                 curl_session_count++;
537         }
538
539         active_requests++;
540         slot->in_use = 1;
541         slot->local = NULL;
542         slot->results = NULL;
543         slot->finished = NULL;
544         slot->callback_data = NULL;
545         slot->callback_func = NULL;
546         curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
547         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
548         curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
549         curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
550         curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
551         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
552         curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
553         curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
554         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
555
556         return slot;
557 }
558
559 int start_active_slot(struct active_request_slot *slot)
560 {
561 #ifdef USE_CURL_MULTI
562         CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
563         int num_transfers;
564
565         if (curlm_result != CURLM_OK &&
566             curlm_result != CURLM_CALL_MULTI_PERFORM) {
567                 active_requests--;
568                 slot->in_use = 0;
569                 return 0;
570         }
571
572         /*
573          * We know there must be something to do, since we just added
574          * something.
575          */
576         curl_multi_perform(curlm, &num_transfers);
577 #endif
578         return 1;
579 }
580
581 #ifdef USE_CURL_MULTI
582 struct fill_chain {
583         void *data;
584         int (*fill)(void *);
585         struct fill_chain *next;
586 };
587
588 static struct fill_chain *fill_cfg;
589
590 void add_fill_function(void *data, int (*fill)(void *))
591 {
592         struct fill_chain *new = xmalloc(sizeof(*new));
593         struct fill_chain **linkp = &fill_cfg;
594         new->data = data;
595         new->fill = fill;
596         new->next = NULL;
597         while (*linkp)
598                 linkp = &(*linkp)->next;
599         *linkp = new;
600 }
601
602 void fill_active_slots(void)
603 {
604         struct active_request_slot *slot = active_queue_head;
605
606         while (active_requests < max_requests) {
607                 struct fill_chain *fill;
608                 for (fill = fill_cfg; fill; fill = fill->next)
609                         if (fill->fill(fill->data))
610                                 break;
611
612                 if (!fill)
613                         break;
614         }
615
616         while (slot != NULL) {
617                 if (!slot->in_use && slot->curl != NULL
618                         && curl_session_count > min_curl_sessions) {
619                         curl_easy_cleanup(slot->curl);
620                         slot->curl = NULL;
621                         curl_session_count--;
622                 }
623                 slot = slot->next;
624         }
625 }
626
627 void step_active_slots(void)
628 {
629         int num_transfers;
630         CURLMcode curlm_result;
631
632         do {
633                 curlm_result = curl_multi_perform(curlm, &num_transfers);
634         } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
635         if (num_transfers < active_requests) {
636                 process_curl_messages();
637                 fill_active_slots();
638         }
639 }
640 #endif
641
642 void run_active_slot(struct active_request_slot *slot)
643 {
644 #ifdef USE_CURL_MULTI
645         long last_pos = 0;
646         long current_pos;
647         fd_set readfds;
648         fd_set writefds;
649         fd_set excfds;
650         int max_fd;
651         struct timeval select_timeout;
652         int finished = 0;
653
654         slot->finished = &finished;
655         while (!finished) {
656                 data_received = 0;
657                 step_active_slots();
658
659                 if (!data_received && slot->local != NULL) {
660                         current_pos = ftell(slot->local);
661                         if (current_pos > last_pos)
662                                 data_received++;
663                         last_pos = current_pos;
664                 }
665
666                 if (slot->in_use && !data_received) {
667                         max_fd = 0;
668                         FD_ZERO(&readfds);
669                         FD_ZERO(&writefds);
670                         FD_ZERO(&excfds);
671                         select_timeout.tv_sec = 0;
672                         select_timeout.tv_usec = 50000;
673                         select(max_fd, &readfds, &writefds,
674                                &excfds, &select_timeout);
675                 }
676         }
677 #else
678         while (slot->in_use) {
679                 slot->curl_result = curl_easy_perform(slot->curl);
680                 finish_active_slot(slot);
681         }
682 #endif
683 }
684
685 static void closedown_active_slot(struct active_request_slot *slot)
686 {
687         active_requests--;
688         slot->in_use = 0;
689 }
690
691 static void release_active_slot(struct active_request_slot *slot)
692 {
693         closedown_active_slot(slot);
694         if (slot->curl && curl_session_count > min_curl_sessions) {
695 #ifdef USE_CURL_MULTI
696                 curl_multi_remove_handle(curlm, slot->curl);
697 #endif
698                 curl_easy_cleanup(slot->curl);
699                 slot->curl = NULL;
700                 curl_session_count--;
701         }
702 #ifdef USE_CURL_MULTI
703         fill_active_slots();
704 #endif
705 }
706
707 void finish_active_slot(struct active_request_slot *slot)
708 {
709         closedown_active_slot(slot);
710         curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
711
712         if (slot->finished != NULL)
713                 (*slot->finished) = 1;
714
715         /* Store slot results so they can be read after the slot is reused */
716         if (slot->results != NULL) {
717                 slot->results->curl_result = slot->curl_result;
718                 slot->results->http_code = slot->http_code;
719         }
720
721         /* Run callback if appropriate */
722         if (slot->callback_func != NULL)
723                 slot->callback_func(slot->callback_data);
724 }
725
726 void finish_all_active_slots(void)
727 {
728         struct active_request_slot *slot = active_queue_head;
729
730         while (slot != NULL)
731                 if (slot->in_use) {
732                         run_active_slot(slot);
733                         slot = active_queue_head;
734                 } else {
735                         slot = slot->next;
736                 }
737 }
738
739 /* Helpers for modifying and creating URLs */
740 static inline int needs_quote(int ch)
741 {
742         if (((ch >= 'A') && (ch <= 'Z'))
743                         || ((ch >= 'a') && (ch <= 'z'))
744                         || ((ch >= '0') && (ch <= '9'))
745                         || (ch == '/')
746                         || (ch == '-')
747                         || (ch == '.'))
748                 return 0;
749         return 1;
750 }
751
752 static inline int hex(int v)
753 {
754         if (v < 10)
755                 return '0' + v;
756         else
757                 return 'A' + v - 10;
758 }
759
760 static char *quote_ref_url(const char *base, const char *ref)
761 {
762         struct strbuf buf = STRBUF_INIT;
763         const char *cp;
764         int ch;
765
766         end_url_with_slash(&buf, base);
767
768         for (cp = ref; (ch = *cp) != 0; cp++)
769                 if (needs_quote(ch))
770                         strbuf_addf(&buf, "%%%02x", ch);
771                 else
772                         strbuf_addch(&buf, *cp);
773
774         return strbuf_detach(&buf, NULL);
775 }
776
777 void append_remote_object_url(struct strbuf *buf, const char *url,
778                               const char *hex,
779                               int only_two_digit_prefix)
780 {
781         end_url_with_slash(buf, url);
782
783         strbuf_addf(buf, "objects/%.*s/", 2, hex);
784         if (!only_two_digit_prefix)
785                 strbuf_addf(buf, "%s", hex+2);
786 }
787
788 char *get_remote_object_url(const char *url, const char *hex,
789                             int only_two_digit_prefix)
790 {
791         struct strbuf buf = STRBUF_INIT;
792         append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
793         return strbuf_detach(&buf, NULL);
794 }
795
796 /* http_request() targets */
797 #define HTTP_REQUEST_STRBUF     0
798 #define HTTP_REQUEST_FILE       1
799
800 static int http_request(const char *url, void *result, int target, int options)
801 {
802         struct active_request_slot *slot;
803         struct slot_results results;
804         struct curl_slist *headers = NULL;
805         struct strbuf buf = STRBUF_INIT;
806         int ret;
807
808         slot = get_active_slot();
809         slot->results = &results;
810         curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
811
812         if (result == NULL) {
813                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
814         } else {
815                 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
816                 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
817
818                 if (target == HTTP_REQUEST_FILE) {
819                         long posn = ftell(result);
820                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
821                                          fwrite);
822                         if (posn > 0) {
823                                 strbuf_addf(&buf, "Range: bytes=%ld-", posn);
824                                 headers = curl_slist_append(headers, buf.buf);
825                                 strbuf_reset(&buf);
826                         }
827                         slot->local = result;
828                 } else
829                         curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
830                                          fwrite_buffer);
831         }
832
833         strbuf_addstr(&buf, "Pragma:");
834         if (options & HTTP_NO_CACHE)
835                 strbuf_addstr(&buf, " no-cache");
836
837         headers = curl_slist_append(headers, buf.buf);
838
839         curl_easy_setopt(slot->curl, CURLOPT_URL, url);
840         curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
841
842         if (start_active_slot(slot)) {
843                 run_active_slot(slot);
844                 if (results.curl_result == CURLE_OK)
845                         ret = HTTP_OK;
846                 else if (missing_target(&results))
847                         ret = HTTP_MISSING_TARGET;
848                 else if (results.http_code == 401) {
849                         if (user_name) {
850                                 ret = HTTP_NOAUTH;
851                         } else {
852                                 /*
853                                  * git_getpass is needed here because its very likely stdin/stdout are
854                                  * pipes to our parent process.  So we instead need to use /dev/tty,
855                                  * but that is non-portable.  Using git_getpass() can at least be stubbed
856                                  * on other platforms with a different implementation if/when necessary.
857                                  */
858                                 user_name = xstrdup(git_getpass_with_description("Username", description));
859                                 init_curl_http_auth(slot->curl);
860                                 ret = HTTP_REAUTH;
861                         }
862                 } else {
863                         if (!curl_errorstr[0])
864                                 strlcpy(curl_errorstr,
865                                         curl_easy_strerror(results.curl_result),
866                                         sizeof(curl_errorstr));
867                         ret = HTTP_ERROR;
868                 }
869         } else {
870                 error("Unable to start HTTP request for %s", url);
871                 ret = HTTP_START_FAILED;
872         }
873
874         slot->local = NULL;
875         curl_slist_free_all(headers);
876         strbuf_release(&buf);
877
878         return ret;
879 }
880
881 static int http_request_reauth(const char *url, void *result, int target,
882                                int options)
883 {
884         int ret = http_request(url, result, target, options);
885         if (ret != HTTP_REAUTH)
886                 return ret;
887         return http_request(url, result, target, options);
888 }
889
890 int http_get_strbuf(const char *url, struct strbuf *result, int options)
891 {
892         return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
893 }
894
895 /*
896  * Downloads an url and stores the result in the given file.
897  *
898  * If a previous interrupted download is detected (i.e. a previous temporary
899  * file is still around) the download is resumed.
900  */
901 static int http_get_file(const char *url, const char *filename, int options)
902 {
903         int ret;
904         struct strbuf tmpfile = STRBUF_INIT;
905         FILE *result;
906
907         strbuf_addf(&tmpfile, "%s.temp", filename);
908         result = fopen(tmpfile.buf, "a");
909         if (! result) {
910                 error("Unable to open local file %s", tmpfile.buf);
911                 ret = HTTP_ERROR;
912                 goto cleanup;
913         }
914
915         ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
916         fclose(result);
917
918         if ((ret == HTTP_OK) && move_temp_to_file(tmpfile.buf, filename))
919                 ret = HTTP_ERROR;
920 cleanup:
921         strbuf_release(&tmpfile);
922         return ret;
923 }
924
925 int http_error(const char *url, int ret)
926 {
927         /* http_request has already handled HTTP_START_FAILED. */
928         if (ret != HTTP_START_FAILED)
929                 error("%s while accessing %s", curl_errorstr, url);
930
931         return ret;
932 }
933
934 int http_fetch_ref(const char *base, struct ref *ref)
935 {
936         char *url;
937         struct strbuf buffer = STRBUF_INIT;
938         int ret = -1;
939
940         url = quote_ref_url(base, ref->name);
941         if (http_get_strbuf(url, &buffer, HTTP_NO_CACHE) == HTTP_OK) {
942                 strbuf_rtrim(&buffer);
943                 if (buffer.len == 40)
944                         ret = get_sha1_hex(buffer.buf, ref->old_sha1);
945                 else if (!prefixcmp(buffer.buf, "ref: ")) {
946                         ref->symref = xstrdup(buffer.buf + 5);
947                         ret = 0;
948                 }
949         }
950
951         strbuf_release(&buffer);
952         free(url);
953         return ret;
954 }
955
956 /* Helpers for fetching packs */
957 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
958 {
959         char *url, *tmp;
960         struct strbuf buf = STRBUF_INIT;
961
962         if (http_is_verbose)
963                 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
964
965         end_url_with_slash(&buf, base_url);
966         strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
967         url = strbuf_detach(&buf, NULL);
968
969         strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
970         tmp = strbuf_detach(&buf, NULL);
971
972         if (http_get_file(url, tmp, 0) != HTTP_OK) {
973                 error("Unable to get pack index %s\n", url);
974                 free(tmp);
975                 tmp = NULL;
976         }
977
978         free(url);
979         return tmp;
980 }
981
982 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
983         unsigned char *sha1, const char *base_url)
984 {
985         struct packed_git *new_pack;
986         char *tmp_idx = NULL;
987         int ret;
988
989         if (has_pack_index(sha1)) {
990                 new_pack = parse_pack_index(sha1, NULL);
991                 if (!new_pack)
992                         return -1; /* parse_pack_index() already issued error message */
993                 goto add_pack;
994         }
995
996         tmp_idx = fetch_pack_index(sha1, base_url);
997         if (!tmp_idx)
998                 return -1;
999
1000         new_pack = parse_pack_index(sha1, tmp_idx);
1001         if (!new_pack) {
1002                 unlink(tmp_idx);
1003                 free(tmp_idx);
1004
1005                 return -1; /* parse_pack_index() already issued error message */
1006         }
1007
1008         ret = verify_pack_index(new_pack);
1009         if (!ret) {
1010                 close_pack_index(new_pack);
1011                 ret = move_temp_to_file(tmp_idx, sha1_pack_index_name(sha1));
1012         }
1013         free(tmp_idx);
1014         if (ret)
1015                 return -1;
1016
1017 add_pack:
1018         new_pack->next = *packs_head;
1019         *packs_head = new_pack;
1020         return 0;
1021 }
1022
1023 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1024 {
1025         int ret = 0, i = 0;
1026         char *url, *data;
1027         struct strbuf buf = STRBUF_INIT;
1028         unsigned char sha1[20];
1029
1030         end_url_with_slash(&buf, base_url);
1031         strbuf_addstr(&buf, "objects/info/packs");
1032         url = strbuf_detach(&buf, NULL);
1033
1034         ret = http_get_strbuf(url, &buf, HTTP_NO_CACHE);
1035         if (ret != HTTP_OK)
1036                 goto cleanup;
1037
1038         data = buf.buf;
1039         while (i < buf.len) {
1040                 switch (data[i]) {
1041                 case 'P':
1042                         i++;
1043                         if (i + 52 <= buf.len &&
1044                             !prefixcmp(data + i, " pack-") &&
1045                             !prefixcmp(data + i + 46, ".pack\n")) {
1046                                 get_sha1_hex(data + i + 6, sha1);
1047                                 fetch_and_setup_pack_index(packs_head, sha1,
1048                                                       base_url);
1049                                 i += 51;
1050                                 break;
1051                         }
1052                 default:
1053                         while (i < buf.len && data[i] != '\n')
1054                                 i++;
1055                 }
1056                 i++;
1057         }
1058
1059 cleanup:
1060         free(url);
1061         return ret;
1062 }
1063
1064 void release_http_pack_request(struct http_pack_request *preq)
1065 {
1066         if (preq->packfile != NULL) {
1067                 fclose(preq->packfile);
1068                 preq->packfile = NULL;
1069                 preq->slot->local = NULL;
1070         }
1071         if (preq->range_header != NULL) {
1072                 curl_slist_free_all(preq->range_header);
1073                 preq->range_header = NULL;
1074         }
1075         preq->slot = NULL;
1076         free(preq->url);
1077 }
1078
1079 int finish_http_pack_request(struct http_pack_request *preq)
1080 {
1081         struct packed_git **lst;
1082         struct packed_git *p = preq->target;
1083         char *tmp_idx;
1084         struct child_process ip;
1085         const char *ip_argv[8];
1086
1087         close_pack_index(p);
1088
1089         fclose(preq->packfile);
1090         preq->packfile = NULL;
1091         preq->slot->local = NULL;
1092
1093         lst = preq->lst;
1094         while (*lst != p)
1095                 lst = &((*lst)->next);
1096         *lst = (*lst)->next;
1097
1098         tmp_idx = xstrdup(preq->tmpfile);
1099         strcpy(tmp_idx + strlen(tmp_idx) - strlen(".pack.temp"),
1100                ".idx.temp");
1101
1102         ip_argv[0] = "index-pack";
1103         ip_argv[1] = "-o";
1104         ip_argv[2] = tmp_idx;
1105         ip_argv[3] = preq->tmpfile;
1106         ip_argv[4] = NULL;
1107
1108         memset(&ip, 0, sizeof(ip));
1109         ip.argv = ip_argv;
1110         ip.git_cmd = 1;
1111         ip.no_stdin = 1;
1112         ip.no_stdout = 1;
1113
1114         if (run_command(&ip)) {
1115                 unlink(preq->tmpfile);
1116                 unlink(tmp_idx);
1117                 free(tmp_idx);
1118                 return -1;
1119         }
1120
1121         unlink(sha1_pack_index_name(p->sha1));
1122
1123         if (move_temp_to_file(preq->tmpfile, sha1_pack_name(p->sha1))
1124          || move_temp_to_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1125                 free(tmp_idx);
1126                 return -1;
1127         }
1128
1129         install_packed_git(p);
1130         free(tmp_idx);
1131         return 0;
1132 }
1133
1134 struct http_pack_request *new_http_pack_request(
1135         struct packed_git *target, const char *base_url)
1136 {
1137         long prev_posn = 0;
1138         char range[RANGE_HEADER_SIZE];
1139         struct strbuf buf = STRBUF_INIT;
1140         struct http_pack_request *preq;
1141
1142         preq = xcalloc(1, sizeof(*preq));
1143         preq->target = target;
1144
1145         end_url_with_slash(&buf, base_url);
1146         strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1147                 sha1_to_hex(target->sha1));
1148         preq->url = strbuf_detach(&buf, NULL);
1149
1150         snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1151                 sha1_pack_name(target->sha1));
1152         preq->packfile = fopen(preq->tmpfile, "a");
1153         if (!preq->packfile) {
1154                 error("Unable to open local file %s for pack",
1155                       preq->tmpfile);
1156                 goto abort;
1157         }
1158
1159         preq->slot = get_active_slot();
1160         preq->slot->local = preq->packfile;
1161         curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1162         curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1163         curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1164         curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1165                 no_pragma_header);
1166
1167         /*
1168          * If there is data present from a previous transfer attempt,
1169          * resume where it left off
1170          */
1171         prev_posn = ftell(preq->packfile);
1172         if (prev_posn>0) {
1173                 if (http_is_verbose)
1174                         fprintf(stderr,
1175                                 "Resuming fetch of pack %s at byte %ld\n",
1176                                 sha1_to_hex(target->sha1), prev_posn);
1177                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1178                 preq->range_header = curl_slist_append(NULL, range);
1179                 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1180                         preq->range_header);
1181         }
1182
1183         return preq;
1184
1185 abort:
1186         free(preq->url);
1187         free(preq);
1188         return NULL;
1189 }
1190
1191 /* Helpers for fetching objects (loose) */
1192 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1193                                void *data)
1194 {
1195         unsigned char expn[4096];
1196         size_t size = eltsize * nmemb;
1197         int posn = 0;
1198         struct http_object_request *freq =
1199                 (struct http_object_request *)data;
1200         do {
1201                 ssize_t retval = xwrite(freq->localfile,
1202                                         (char *) ptr + posn, size - posn);
1203                 if (retval < 0)
1204                         return posn;
1205                 posn += retval;
1206         } while (posn < size);
1207
1208         freq->stream.avail_in = size;
1209         freq->stream.next_in = (void *)ptr;
1210         do {
1211                 freq->stream.next_out = expn;
1212                 freq->stream.avail_out = sizeof(expn);
1213                 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1214                 git_SHA1_Update(&freq->c, expn,
1215                                 sizeof(expn) - freq->stream.avail_out);
1216         } while (freq->stream.avail_in && freq->zret == Z_OK);
1217         data_received++;
1218         return size;
1219 }
1220
1221 struct http_object_request *new_http_object_request(const char *base_url,
1222         unsigned char *sha1)
1223 {
1224         char *hex = sha1_to_hex(sha1);
1225         char *filename;
1226         char prevfile[PATH_MAX];
1227         int prevlocal;
1228         char prev_buf[PREV_BUF_SIZE];
1229         ssize_t prev_read = 0;
1230         long prev_posn = 0;
1231         char range[RANGE_HEADER_SIZE];
1232         struct curl_slist *range_header = NULL;
1233         struct http_object_request *freq;
1234
1235         freq = xcalloc(1, sizeof(*freq));
1236         hashcpy(freq->sha1, sha1);
1237         freq->localfile = -1;
1238
1239         filename = sha1_file_name(sha1);
1240         snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1241                  "%s.temp", filename);
1242
1243         snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1244         unlink_or_warn(prevfile);
1245         rename(freq->tmpfile, prevfile);
1246         unlink_or_warn(freq->tmpfile);
1247
1248         if (freq->localfile != -1)
1249                 error("fd leakage in start: %d", freq->localfile);
1250         freq->localfile = open(freq->tmpfile,
1251                                O_WRONLY | O_CREAT | O_EXCL, 0666);
1252         /*
1253          * This could have failed due to the "lazy directory creation";
1254          * try to mkdir the last path component.
1255          */
1256         if (freq->localfile < 0 && errno == ENOENT) {
1257                 char *dir = strrchr(freq->tmpfile, '/');
1258                 if (dir) {
1259                         *dir = 0;
1260                         mkdir(freq->tmpfile, 0777);
1261                         *dir = '/';
1262                 }
1263                 freq->localfile = open(freq->tmpfile,
1264                                        O_WRONLY | O_CREAT | O_EXCL, 0666);
1265         }
1266
1267         if (freq->localfile < 0) {
1268                 error("Couldn't create temporary file %s: %s",
1269                       freq->tmpfile, strerror(errno));
1270                 goto abort;
1271         }
1272
1273         git_inflate_init(&freq->stream);
1274
1275         git_SHA1_Init(&freq->c);
1276
1277         freq->url = get_remote_object_url(base_url, hex, 0);
1278
1279         /*
1280          * If a previous temp file is present, process what was already
1281          * fetched.
1282          */
1283         prevlocal = open(prevfile, O_RDONLY);
1284         if (prevlocal != -1) {
1285                 do {
1286                         prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1287                         if (prev_read>0) {
1288                                 if (fwrite_sha1_file(prev_buf,
1289                                                      1,
1290                                                      prev_read,
1291                                                      freq) == prev_read) {
1292                                         prev_posn += prev_read;
1293                                 } else {
1294                                         prev_read = -1;
1295                                 }
1296                         }
1297                 } while (prev_read > 0);
1298                 close(prevlocal);
1299         }
1300         unlink_or_warn(prevfile);
1301
1302         /*
1303          * Reset inflate/SHA1 if there was an error reading the previous temp
1304          * file; also rewind to the beginning of the local file.
1305          */
1306         if (prev_read == -1) {
1307                 memset(&freq->stream, 0, sizeof(freq->stream));
1308                 git_inflate_init(&freq->stream);
1309                 git_SHA1_Init(&freq->c);
1310                 if (prev_posn>0) {
1311                         prev_posn = 0;
1312                         lseek(freq->localfile, 0, SEEK_SET);
1313                         if (ftruncate(freq->localfile, 0) < 0) {
1314                                 error("Couldn't truncate temporary file %s: %s",
1315                                           freq->tmpfile, strerror(errno));
1316                                 goto abort;
1317                         }
1318                 }
1319         }
1320
1321         freq->slot = get_active_slot();
1322
1323         curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1324         curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1325         curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1326         curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1327         curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1328
1329         /*
1330          * If we have successfully processed data from a previous fetch
1331          * attempt, only fetch the data we don't already have.
1332          */
1333         if (prev_posn>0) {
1334                 if (http_is_verbose)
1335                         fprintf(stderr,
1336                                 "Resuming fetch of object %s at byte %ld\n",
1337                                 hex, prev_posn);
1338                 sprintf(range, "Range: bytes=%ld-", prev_posn);
1339                 range_header = curl_slist_append(range_header, range);
1340                 curl_easy_setopt(freq->slot->curl,
1341                                  CURLOPT_HTTPHEADER, range_header);
1342         }
1343
1344         return freq;
1345
1346 abort:
1347         free(freq->url);
1348         free(freq);
1349         return NULL;
1350 }
1351
1352 void process_http_object_request(struct http_object_request *freq)
1353 {
1354         if (freq->slot == NULL)
1355                 return;
1356         freq->curl_result = freq->slot->curl_result;
1357         freq->http_code = freq->slot->http_code;
1358         freq->slot = NULL;
1359 }
1360
1361 int finish_http_object_request(struct http_object_request *freq)
1362 {
1363         struct stat st;
1364
1365         close(freq->localfile);
1366         freq->localfile = -1;
1367
1368         process_http_object_request(freq);
1369
1370         if (freq->http_code == 416) {
1371                 warning("requested range invalid; we may already have all the data.");
1372         } else if (freq->curl_result != CURLE_OK) {
1373                 if (stat(freq->tmpfile, &st) == 0)
1374                         if (st.st_size == 0)
1375                                 unlink_or_warn(freq->tmpfile);
1376                 return -1;
1377         }
1378
1379         git_inflate_end(&freq->stream);
1380         git_SHA1_Final(freq->real_sha1, &freq->c);
1381         if (freq->zret != Z_STREAM_END) {
1382                 unlink_or_warn(freq->tmpfile);
1383                 return -1;
1384         }
1385         if (hashcmp(freq->sha1, freq->real_sha1)) {
1386                 unlink_or_warn(freq->tmpfile);
1387                 return -1;
1388         }
1389         freq->rename =
1390                 move_temp_to_file(freq->tmpfile, sha1_file_name(freq->sha1));
1391
1392         return freq->rename;
1393 }
1394
1395 void abort_http_object_request(struct http_object_request *freq)
1396 {
1397         unlink_or_warn(freq->tmpfile);
1398
1399         release_http_object_request(freq);
1400 }
1401
1402 void release_http_object_request(struct http_object_request *freq)
1403 {
1404         if (freq->localfile != -1) {
1405                 close(freq->localfile);
1406                 freq->localfile = -1;
1407         }
1408         if (freq->url != NULL) {
1409                 free(freq->url);
1410                 freq->url = NULL;
1411         }
1412         if (freq->slot != NULL) {
1413                 freq->slot->callback_func = NULL;
1414                 freq->slot->callback_data = NULL;
1415                 release_active_slot(freq->slot);
1416                 freq->slot = NULL;
1417         }
1418 }