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http: allow selection of proxy authentication method
[alt-git.git] / http.c
blobf46bfc43f9e5e8073563be853744262a1bb4c5d6
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 int active_requests;
15 int http_is_verbose;
16 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
17
18 #if LIBCURL_VERSION_NUM >= 0x070a06
19 #define LIBCURL_CAN_HANDLE_AUTH_ANY
20 #endif
21
22 static int min_curl_sessions = 1;
23 static int curl_session_count;
24 #ifdef USE_CURL_MULTI
25 static int max_requests = -1;
26 static CURLM *curlm;
27 #endif
28 #ifndef NO_CURL_EASY_DUPHANDLE
29 static CURL *curl_default;
30 #endif
31
32 #define PREV_BUF_SIZE 4096
33
34 char curl_errorstr[CURL_ERROR_SIZE];
35
36 static int curl_ssl_verify = -1;
37 static int curl_ssl_try;
38 static const char *ssl_cert;
39 static const char *ssl_cipherlist;
40 static const char *ssl_version;
41 static struct {
42 const char *name;
43 long ssl_version;
44 } sslversions[] = {
45 { "sslv2", CURL_SSLVERSION_SSLv2 },
46 { "sslv3", CURL_SSLVERSION_SSLv3 },
47 { "tlsv1", CURL_SSLVERSION_TLSv1 },
48 #if LIBCURL_VERSION_NUM >= 0x072200
49 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
50 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
51 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
52 #endif
53 };
54 #if LIBCURL_VERSION_NUM >= 0x070903
55 static const char *ssl_key;
56 #endif
57 #if LIBCURL_VERSION_NUM >= 0x070908
58 static const char *ssl_capath;
59 #endif
60 static const char *ssl_cainfo;
61 static long curl_low_speed_limit = -1;
62 static long curl_low_speed_time = -1;
63 static int curl_ftp_no_epsv;
64 static const char *curl_http_proxy;
65 static const char *http_proxy_authmethod;
66 static struct {
67 const char *name;
68 long curlauth_param;
69 } proxy_authmethods[] = {
70 { "basic", CURLAUTH_BASIC },
71 { "digest", CURLAUTH_DIGEST },
72 { "negotiate", CURLAUTH_GSSNEGOTIATE },
73 { "ntlm", CURLAUTH_NTLM },
74 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
75 { "anyauth", CURLAUTH_ANY },
76 #endif
77 /*
78 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
79 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
80 * here, too
81 */
82 };
83 static const char *curl_cookie_file;
84 static int curl_save_cookies;
85 struct credential http_auth = CREDENTIAL_INIT;
86 static int http_proactive_auth;
87 static const char *user_agent;
88
89 #if LIBCURL_VERSION_NUM >= 0x071700
90 /* Use CURLOPT_KEYPASSWD as is */
91 #elif LIBCURL_VERSION_NUM >= 0x070903
92 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
93 #else
94 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
95 #endif
96
97 static struct credential cert_auth = CREDENTIAL_INIT;
98 static int ssl_cert_password_required;
99 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
100 static unsigned long http_auth_methods = CURLAUTH_ANY;
101 #endif
102
103 static struct curl_slist *pragma_header;
104 static struct curl_slist *no_pragma_header;
105
106 static struct active_request_slot *active_queue_head;
107
108 static char *cached_accept_language;
109
110 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
111 {
112 size_t size = eltsize * nmemb;
113 struct buffer *buffer = buffer_;
114
115 if (size > buffer->buf.len - buffer->posn)
116 size = buffer->buf.len - buffer->posn;
117 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
118 buffer->posn += size;
119
120 return size;
121 }
122
123 #ifndef NO_CURL_IOCTL
124 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
125 {
126 struct buffer *buffer = clientp;
127
128 switch (cmd) {
129 case CURLIOCMD_NOP:
130 return CURLIOE_OK;
131
132 case CURLIOCMD_RESTARTREAD:
133 buffer->posn = 0;
134 return CURLIOE_OK;
135
136 default:
137 return CURLIOE_UNKNOWNCMD;
138 }
139 }
140 #endif
141
142 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
143 {
144 size_t size = eltsize * nmemb;
145 struct strbuf *buffer = buffer_;
146
147 strbuf_add(buffer, ptr, size);
148 return size;
149 }
150
151 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
152 {
153 return eltsize * nmemb;
154 }
155
156 static void closedown_active_slot(struct active_request_slot *slot)
157 {
158 active_requests--;
159 slot->in_use = 0;
160 }
161
162 static void finish_active_slot(struct active_request_slot *slot)
163 {
164 closedown_active_slot(slot);
165 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
166
167 if (slot->finished != NULL)
168 (*slot->finished) = 1;
169
170 /* Store slot results so they can be read after the slot is reused */
171 if (slot->results != NULL) {
172 slot->results->curl_result = slot->curl_result;
173 slot->results->http_code = slot->http_code;
174 #if LIBCURL_VERSION_NUM >= 0x070a08
175 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
176 &slot->results->auth_avail);
177 #else
178 slot->results->auth_avail = 0;
179 #endif
180 }
181
182 /* Run callback if appropriate */
183 if (slot->callback_func != NULL)
184 slot->callback_func(slot->callback_data);
185 }
186
187 #ifdef USE_CURL_MULTI
188 static void process_curl_messages(void)
189 {
190 int num_messages;
191 struct active_request_slot *slot;
192 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
193
194 while (curl_message != NULL) {
195 if (curl_message->msg == CURLMSG_DONE) {
196 int curl_result = curl_message->data.result;
197 slot = active_queue_head;
198 while (slot != NULL &&
199 slot->curl != curl_message->easy_handle)
200 slot = slot->next;
201 if (slot != NULL) {
202 curl_multi_remove_handle(curlm, slot->curl);
203 slot->curl_result = curl_result;
204 finish_active_slot(slot);
205 } else {
206 fprintf(stderr, "Received DONE message for unknown request!\n");
207 }
208 } else {
209 fprintf(stderr, "Unknown CURL message received: %d\n",
210 (int)curl_message->msg);
211 }
212 curl_message = curl_multi_info_read(curlm, &num_messages);
213 }
214 }
215 #endif
216
217 static int http_options(const char *var, const char *value, void *cb)
218 {
219 if (!strcmp("http.sslverify", var)) {
220 curl_ssl_verify = git_config_bool(var, value);
221 return 0;
222 }
223 if (!strcmp("http.sslcipherlist", var))
224 return git_config_string(&ssl_cipherlist, var, value);
225 if (!strcmp("http.sslversion", var))
226 return git_config_string(&ssl_version, var, value);
227 if (!strcmp("http.sslcert", var))
228 return git_config_string(&ssl_cert, var, value);
229 #if LIBCURL_VERSION_NUM >= 0x070903
230 if (!strcmp("http.sslkey", var))
231 return git_config_string(&ssl_key, var, value);
232 #endif
233 #if LIBCURL_VERSION_NUM >= 0x070908
234 if (!strcmp("http.sslcapath", var))
235 return git_config_pathname(&ssl_capath, var, value);
236 #endif
237 if (!strcmp("http.sslcainfo", var))
238 return git_config_pathname(&ssl_cainfo, var, value);
239 if (!strcmp("http.sslcertpasswordprotected", var)) {
240 ssl_cert_password_required = git_config_bool(var, value);
241 return 0;
242 }
243 if (!strcmp("http.ssltry", var)) {
244 curl_ssl_try = git_config_bool(var, value);
245 return 0;
246 }
247 if (!strcmp("http.minsessions", var)) {
248 min_curl_sessions = git_config_int(var, value);
249 #ifndef USE_CURL_MULTI
250 if (min_curl_sessions > 1)
251 min_curl_sessions = 1;
252 #endif
253 return 0;
254 }
255 #ifdef USE_CURL_MULTI
256 if (!strcmp("http.maxrequests", var)) {
257 max_requests = git_config_int(var, value);
258 return 0;
259 }
260 #endif
261 if (!strcmp("http.lowspeedlimit", var)) {
262 curl_low_speed_limit = (long)git_config_int(var, value);
263 return 0;
264 }
265 if (!strcmp("http.lowspeedtime", var)) {
266 curl_low_speed_time = (long)git_config_int(var, value);
267 return 0;
268 }
269
270 if (!strcmp("http.noepsv", var)) {
271 curl_ftp_no_epsv = git_config_bool(var, value);
272 return 0;
273 }
274 if (!strcmp("http.proxy", var))
275 return git_config_string(&curl_http_proxy, var, value);
276
277 if (!strcmp("http.proxyauthmethod", var))
278 return git_config_string(&http_proxy_authmethod, var, value);
279
280 if (!strcmp("http.cookiefile", var))
281 return git_config_string(&curl_cookie_file, var, value);
282 if (!strcmp("http.savecookies", var)) {
283 curl_save_cookies = git_config_bool(var, value);
284 return 0;
285 }
286
287 if (!strcmp("http.postbuffer", var)) {
288 http_post_buffer = git_config_int(var, value);
289 if (http_post_buffer < LARGE_PACKET_MAX)
290 http_post_buffer = LARGE_PACKET_MAX;
291 return 0;
292 }
293
294 if (!strcmp("http.useragent", var))
295 return git_config_string(&user_agent, var, value);
296
297 /* Fall back on the default ones */
298 return git_default_config(var, value, cb);
299 }
300
301 static void init_curl_http_auth(CURL *result)
302 {
303 if (!http_auth.username)
304 return;
305
306 credential_fill(&http_auth);
307
308 #if LIBCURL_VERSION_NUM >= 0x071301
309 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
310 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
311 #else
312 {
313 static struct strbuf up = STRBUF_INIT;
314 /*
315 * Note that we assume we only ever have a single set of
316 * credentials in a given program run, so we do not have
317 * to worry about updating this buffer, only setting its
318 * initial value.
319 */
320 if (!up.len)
321 strbuf_addf(&up, "%s:%s",
322 http_auth.username, http_auth.password);
323 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
324 }
325 #endif
326 }
327
328 /* *var must be free-able */
329 static void var_override(const char **var, char *value)
330 {
331 if (value) {
332 free((void *)*var);
333 *var = xstrdup(value);
334 }
335 }
336
337 static void init_curl_proxy_auth(CURL *result)
338 {
339 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
340
341 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
342 if (http_proxy_authmethod) {
343 int i;
344 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
345 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
346 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
347 proxy_authmethods[i].curlauth_param);
348 break;
349 }
350 }
351 if (i == ARRAY_SIZE(proxy_authmethods)) {
352 warning("unsupported proxy authentication method %s: using anyauth",
353 http_proxy_authmethod);
354 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
355 }
356 }
357 else
358 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
359 #endif
360 }
361
362 static int has_cert_password(void)
363 {
364 if (ssl_cert == NULL || ssl_cert_password_required != 1)
365 return 0;
366 if (!cert_auth.password) {
367 cert_auth.protocol = xstrdup("cert");
368 cert_auth.username = xstrdup("");
369 cert_auth.path = xstrdup(ssl_cert);
370 credential_fill(&cert_auth);
371 }
372 return 1;
373 }
374
375 #if LIBCURL_VERSION_NUM >= 0x071900
376 static void set_curl_keepalive(CURL *c)
377 {
378 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
379 }
380
381 #elif LIBCURL_VERSION_NUM >= 0x071000
382 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
383 {
384 int ka = 1;
385 int rc;
386 socklen_t len = (socklen_t)sizeof(ka);
387
388 if (type != CURLSOCKTYPE_IPCXN)
389 return 0;
390
391 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
392 if (rc < 0)
393 warning("unable to set SO_KEEPALIVE on socket %s",
394 strerror(errno));
395
396 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
397 }
398
399 static void set_curl_keepalive(CURL *c)
400 {
401 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
402 }
403
404 #else
405 static void set_curl_keepalive(CURL *c)
406 {
407 /* not supported on older curl versions */
408 }
409 #endif
410
411 static CURL *get_curl_handle(void)
412 {
413 CURL *result = curl_easy_init();
414 long allowed_protocols = 0;
415
416 if (!result)
417 die("curl_easy_init failed");
418
419 if (!curl_ssl_verify) {
420 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
421 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
422 } else {
423 /* Verify authenticity of the peer's certificate */
424 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
425 /* The name in the cert must match whom we tried to connect */
426 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
427 }
428
429 #if LIBCURL_VERSION_NUM >= 0x070907
430 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
431 #endif
432 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
433 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
434 #endif
435
436 if (http_proactive_auth)
437 init_curl_http_auth(result);
438
439 if (getenv("GIT_SSL_VERSION"))
440 ssl_version = getenv("GIT_SSL_VERSION");
441 if (ssl_version && *ssl_version) {
442 int i;
443 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
444 if (!strcmp(ssl_version, sslversions[i].name)) {
445 curl_easy_setopt(result, CURLOPT_SSLVERSION,
446 sslversions[i].ssl_version);
447 break;
448 }
449 }
450 if (i == ARRAY_SIZE(sslversions))
451 warning("unsupported ssl version %s: using default",
452 ssl_version);
453 }
454
455 if (getenv("GIT_SSL_CIPHER_LIST"))
456 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
457 if (ssl_cipherlist != NULL && *ssl_cipherlist)
458 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
459 ssl_cipherlist);
460
461 if (ssl_cert != NULL)
462 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
463 if (has_cert_password())
464 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
465 #if LIBCURL_VERSION_NUM >= 0x070903
466 if (ssl_key != NULL)
467 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
468 #endif
469 #if LIBCURL_VERSION_NUM >= 0x070908
470 if (ssl_capath != NULL)
471 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
472 #endif
473 if (ssl_cainfo != NULL)
474 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
475
476 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
477 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
478 curl_low_speed_limit);
479 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
480 curl_low_speed_time);
481 }
482
483 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
484 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
485 #if LIBCURL_VERSION_NUM >= 0x071301
486 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
487 #elif LIBCURL_VERSION_NUM >= 0x071101
488 curl_easy_setopt(result, CURLOPT_POST301, 1);
489 #endif
490 #if LIBCURL_VERSION_NUM >= 0x071304
491 if (is_transport_allowed("http"))
492 allowed_protocols |= CURLPROTO_HTTP;
493 if (is_transport_allowed("https"))
494 allowed_protocols |= CURLPROTO_HTTPS;
495 if (is_transport_allowed("ftp"))
496 allowed_protocols |= CURLPROTO_FTP;
497 if (is_transport_allowed("ftps"))
498 allowed_protocols |= CURLPROTO_FTPS;
499 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
500 #else
501 if (transport_restrict_protocols())
502 warning("protocol restrictions not applied to curl redirects because\n"
503 "your curl version is too old (>= 7.19.4)");
504 #endif
505
506 if (getenv("GIT_CURL_VERBOSE"))
507 curl_easy_setopt(result, CURLOPT_VERBOSE, 1);
508
509 curl_easy_setopt(result, CURLOPT_USERAGENT,
510 user_agent ? user_agent : git_user_agent());
511
512 if (curl_ftp_no_epsv)
513 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
514
515 #ifdef CURLOPT_USE_SSL
516 if (curl_ssl_try)
517 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
518 #endif
519
520 if (curl_http_proxy) {
521 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
522 #if LIBCURL_VERSION_NUM >= 0x071800
523 if (starts_with(curl_http_proxy, "socks5"))
524 curl_easy_setopt(result,
525 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
526 else if (starts_with(curl_http_proxy, "socks4a"))
527 curl_easy_setopt(result,
528 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
529 else if (starts_with(curl_http_proxy, "socks"))
530 curl_easy_setopt(result,
531 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
532 #endif
533 }
534 init_curl_proxy_auth(result);
535
536 set_curl_keepalive(result);
537
538 return result;
539 }
540
541 static void set_from_env(const char **var, const char *envname)
542 {
543 const char *val = getenv(envname);
544 if (val)
545 *var = val;
546 }
547
548 void http_init(struct remote *remote, const char *url, int proactive_auth)
549 {
550 char *low_speed_limit;
551 char *low_speed_time;
552 char *normalized_url;
553 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
554
555 config.section = "http";
556 config.key = NULL;
557 config.collect_fn = http_options;
558 config.cascade_fn = git_default_config;
559 config.cb = NULL;
560
561 http_is_verbose = 0;
562 normalized_url = url_normalize(url, &config.url);
563
564 git_config(urlmatch_config_entry, &config);
565 free(normalized_url);
566
567 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
568 die("curl_global_init failed");
569
570 http_proactive_auth = proactive_auth;
571
572 if (remote && remote->http_proxy)
573 curl_http_proxy = xstrdup(remote->http_proxy);
574
575 if (remote)
576 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
577
578 pragma_header = curl_slist_append(pragma_header, "Pragma: no-cache");
579 no_pragma_header = curl_slist_append(no_pragma_header, "Pragma:");
580
581 #ifdef USE_CURL_MULTI
582 {
583 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
584 if (http_max_requests != NULL)
585 max_requests = atoi(http_max_requests);
586 }
587
588 curlm = curl_multi_init();
589 if (!curlm)
590 die("curl_multi_init failed");
591 #endif
592
593 if (getenv("GIT_SSL_NO_VERIFY"))
594 curl_ssl_verify = 0;
595
596 set_from_env(&ssl_cert, "GIT_SSL_CERT");
597 #if LIBCURL_VERSION_NUM >= 0x070903
598 set_from_env(&ssl_key, "GIT_SSL_KEY");
599 #endif
600 #if LIBCURL_VERSION_NUM >= 0x070908
601 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
602 #endif
603 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
604
605 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
606
607 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
608 if (low_speed_limit != NULL)
609 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
610 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
611 if (low_speed_time != NULL)
612 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
613
614 if (curl_ssl_verify == -1)
615 curl_ssl_verify = 1;
616
617 curl_session_count = 0;
618 #ifdef USE_CURL_MULTI
619 if (max_requests < 1)
620 max_requests = DEFAULT_MAX_REQUESTS;
621 #endif
622
623 if (getenv("GIT_CURL_FTP_NO_EPSV"))
624 curl_ftp_no_epsv = 1;
625
626 if (url) {
627 credential_from_url(&http_auth, url);
628 if (!ssl_cert_password_required &&
629 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
630 starts_with(url, "https://"))
631 ssl_cert_password_required = 1;
632 }
633
634 #ifndef NO_CURL_EASY_DUPHANDLE
635 curl_default = get_curl_handle();
636 #endif
637 }
638
639 void http_cleanup(void)
640 {
641 struct active_request_slot *slot = active_queue_head;
642
643 while (slot != NULL) {
644 struct active_request_slot *next = slot->next;
645 if (slot->curl != NULL) {
646 #ifdef USE_CURL_MULTI
647 curl_multi_remove_handle(curlm, slot->curl);
648 #endif
649 curl_easy_cleanup(slot->curl);
650 }
651 free(slot);
652 slot = next;
653 }
654 active_queue_head = NULL;
655
656 #ifndef NO_CURL_EASY_DUPHANDLE
657 curl_easy_cleanup(curl_default);
658 #endif
659
660 #ifdef USE_CURL_MULTI
661 curl_multi_cleanup(curlm);
662 #endif
663 curl_global_cleanup();
664
665 curl_slist_free_all(pragma_header);
666 pragma_header = NULL;
667
668 curl_slist_free_all(no_pragma_header);
669 no_pragma_header = NULL;
670
671 if (curl_http_proxy) {
672 free((void *)curl_http_proxy);
673 curl_http_proxy = NULL;
674 }
675
676 free((void *)http_proxy_authmethod);
677 http_proxy_authmethod = NULL;
678
679 if (cert_auth.password != NULL) {
680 memset(cert_auth.password, 0, strlen(cert_auth.password));
681 free(cert_auth.password);
682 cert_auth.password = NULL;
683 }
684 ssl_cert_password_required = 0;
685
686 free(cached_accept_language);
687 cached_accept_language = NULL;
688 }
689
690 struct active_request_slot *get_active_slot(void)
691 {
692 struct active_request_slot *slot = active_queue_head;
693 struct active_request_slot *newslot;
694
695 #ifdef USE_CURL_MULTI
696 int num_transfers;
697
698 /* Wait for a slot to open up if the queue is full */
699 while (active_requests >= max_requests) {
700 curl_multi_perform(curlm, &num_transfers);
701 if (num_transfers < active_requests)
702 process_curl_messages();
703 }
704 #endif
705
706 while (slot != NULL && slot->in_use)
707 slot = slot->next;
708
709 if (slot == NULL) {
710 newslot = xmalloc(sizeof(*newslot));
711 newslot->curl = NULL;
712 newslot->in_use = 0;
713 newslot->next = NULL;
714
715 slot = active_queue_head;
716 if (slot == NULL) {
717 active_queue_head = newslot;
718 } else {
719 while (slot->next != NULL)
720 slot = slot->next;
721 slot->next = newslot;
722 }
723 slot = newslot;
724 }
725
726 if (slot->curl == NULL) {
727 #ifdef NO_CURL_EASY_DUPHANDLE
728 slot->curl = get_curl_handle();
729 #else
730 slot->curl = curl_easy_duphandle(curl_default);
731 #endif
732 curl_session_count++;
733 }
734
735 active_requests++;
736 slot->in_use = 1;
737 slot->results = NULL;
738 slot->finished = NULL;
739 slot->callback_data = NULL;
740 slot->callback_func = NULL;
741 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
742 if (curl_save_cookies)
743 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
744 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
745 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
746 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
747 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
748 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
749 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
750 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
751 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
752 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
753 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
754 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
755 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
756 #endif
757 if (http_auth.password)
758 init_curl_http_auth(slot->curl);
759
760 return slot;
761 }
762
763 int start_active_slot(struct active_request_slot *slot)
764 {
765 #ifdef USE_CURL_MULTI
766 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
767 int num_transfers;
768
769 if (curlm_result != CURLM_OK &&
770 curlm_result != CURLM_CALL_MULTI_PERFORM) {
771 active_requests--;
772 slot->in_use = 0;
773 return 0;
774 }
775
776 /*
777 * We know there must be something to do, since we just added
778 * something.
779 */
780 curl_multi_perform(curlm, &num_transfers);
781 #endif
782 return 1;
783 }
784
785 #ifdef USE_CURL_MULTI
786 struct fill_chain {
787 void *data;
788 int (*fill)(void *);
789 struct fill_chain *next;
790 };
791
792 static struct fill_chain *fill_cfg;
793
794 void add_fill_function(void *data, int (*fill)(void *))
795 {
796 struct fill_chain *new = xmalloc(sizeof(*new));
797 struct fill_chain **linkp = &fill_cfg;
798 new->data = data;
799 new->fill = fill;
800 new->next = NULL;
801 while (*linkp)
802 linkp = &(*linkp)->next;
803 *linkp = new;
804 }
805
806 void fill_active_slots(void)
807 {
808 struct active_request_slot *slot = active_queue_head;
809
810 while (active_requests < max_requests) {
811 struct fill_chain *fill;
812 for (fill = fill_cfg; fill; fill = fill->next)
813 if (fill->fill(fill->data))
814 break;
815
816 if (!fill)
817 break;
818 }
819
820 while (slot != NULL) {
821 if (!slot->in_use && slot->curl != NULL
822 && curl_session_count > min_curl_sessions) {
823 curl_easy_cleanup(slot->curl);
824 slot->curl = NULL;
825 curl_session_count--;
826 }
827 slot = slot->next;
828 }
829 }
830
831 void step_active_slots(void)
832 {
833 int num_transfers;
834 CURLMcode curlm_result;
835
836 do {
837 curlm_result = curl_multi_perform(curlm, &num_transfers);
838 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
839 if (num_transfers < active_requests) {
840 process_curl_messages();
841 fill_active_slots();
842 }
843 }
844 #endif
845
846 void run_active_slot(struct active_request_slot *slot)
847 {
848 #ifdef USE_CURL_MULTI
849 fd_set readfds;
850 fd_set writefds;
851 fd_set excfds;
852 int max_fd;
853 struct timeval select_timeout;
854 int finished = 0;
855
856 slot->finished = &finished;
857 while (!finished) {
858 step_active_slots();
859
860 if (slot->in_use) {
861 #if LIBCURL_VERSION_NUM >= 0x070f04
862 long curl_timeout;
863 curl_multi_timeout(curlm, &curl_timeout);
864 if (curl_timeout == 0) {
865 continue;
866 } else if (curl_timeout == -1) {
867 select_timeout.tv_sec = 0;
868 select_timeout.tv_usec = 50000;
869 } else {
870 select_timeout.tv_sec = curl_timeout / 1000;
871 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
872 }
873 #else
874 select_timeout.tv_sec = 0;
875 select_timeout.tv_usec = 50000;
876 #endif
877
878 max_fd = -1;
879 FD_ZERO(&readfds);
880 FD_ZERO(&writefds);
881 FD_ZERO(&excfds);
882 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
883
884 /*
885 * It can happen that curl_multi_timeout returns a pathologically
886 * long timeout when curl_multi_fdset returns no file descriptors
887 * to read. See commit message for more details.
888 */
889 if (max_fd < 0 &&
890 (select_timeout.tv_sec > 0 ||
891 select_timeout.tv_usec > 50000)) {
892 select_timeout.tv_sec = 0;
893 select_timeout.tv_usec = 50000;
894 }
895
896 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
897 }
898 }
899 #else
900 while (slot->in_use) {
901 slot->curl_result = curl_easy_perform(slot->curl);
902 finish_active_slot(slot);
903 }
904 #endif
905 }
906
907 static void release_active_slot(struct active_request_slot *slot)
908 {
909 closedown_active_slot(slot);
910 if (slot->curl && curl_session_count > min_curl_sessions) {
911 #ifdef USE_CURL_MULTI
912 curl_multi_remove_handle(curlm, slot->curl);
913 #endif
914 curl_easy_cleanup(slot->curl);
915 slot->curl = NULL;
916 curl_session_count--;
917 }
918 #ifdef USE_CURL_MULTI
919 fill_active_slots();
920 #endif
921 }
922
923 void finish_all_active_slots(void)
924 {
925 struct active_request_slot *slot = active_queue_head;
926
927 while (slot != NULL)
928 if (slot->in_use) {
929 run_active_slot(slot);
930 slot = active_queue_head;
931 } else {
932 slot = slot->next;
933 }
934 }
935
936 /* Helpers for modifying and creating URLs */
937 static inline int needs_quote(int ch)
938 {
939 if (((ch >= 'A') && (ch <= 'Z'))
940 || ((ch >= 'a') && (ch <= 'z'))
941 || ((ch >= '0') && (ch <= '9'))
942 || (ch == '/')
943 || (ch == '-')
944 || (ch == '.'))
945 return 0;
946 return 1;
947 }
948
949 static char *quote_ref_url(const char *base, const char *ref)
950 {
951 struct strbuf buf = STRBUF_INIT;
952 const char *cp;
953 int ch;
954
955 end_url_with_slash(&buf, base);
956
957 for (cp = ref; (ch = *cp) != 0; cp++)
958 if (needs_quote(ch))
959 strbuf_addf(&buf, "%%%02x", ch);
960 else
961 strbuf_addch(&buf, *cp);
962
963 return strbuf_detach(&buf, NULL);
964 }
965
966 void append_remote_object_url(struct strbuf *buf, const char *url,
967 const char *hex,
968 int only_two_digit_prefix)
969 {
970 end_url_with_slash(buf, url);
971
972 strbuf_addf(buf, "objects/%.*s/", 2, hex);
973 if (!only_two_digit_prefix)
974 strbuf_addf(buf, "%s", hex+2);
975 }
976
977 char *get_remote_object_url(const char *url, const char *hex,
978 int only_two_digit_prefix)
979 {
980 struct strbuf buf = STRBUF_INIT;
981 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
982 return strbuf_detach(&buf, NULL);
983 }
984
985 static int handle_curl_result(struct slot_results *results)
986 {
987 /*
988 * If we see a failing http code with CURLE_OK, we have turned off
989 * FAILONERROR (to keep the server's custom error response), and should
990 * translate the code into failure here.
991 */
992 if (results->curl_result == CURLE_OK &&
993 results->http_code >= 400) {
994 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
995 /*
996 * Normally curl will already have put the "reason phrase"
997 * from the server into curl_errorstr; unfortunately without
998 * FAILONERROR it is lost, so we can give only the numeric
999 * status code.
1000 */
1001 snprintf(curl_errorstr, sizeof(curl_errorstr),
1002 "The requested URL returned error: %ld",
1003 results->http_code);
1004 }
1005
1006 if (results->curl_result == CURLE_OK) {
1007 credential_approve(&http_auth);
1008 return HTTP_OK;
1009 } else if (missing_target(results))
1010 return HTTP_MISSING_TARGET;
1011 else if (results->http_code == 401) {
1012 if (http_auth.username && http_auth.password) {
1013 credential_reject(&http_auth);
1014 return HTTP_NOAUTH;
1015 } else {
1016 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1017 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1018 #endif
1019 return HTTP_REAUTH;
1020 }
1021 } else {
1022 #if LIBCURL_VERSION_NUM >= 0x070c00
1023 if (!curl_errorstr[0])
1024 strlcpy(curl_errorstr,
1025 curl_easy_strerror(results->curl_result),
1026 sizeof(curl_errorstr));
1027 #endif
1028 return HTTP_ERROR;
1029 }
1030 }
1031
1032 int run_one_slot(struct active_request_slot *slot,
1033 struct slot_results *results)
1034 {
1035 slot->results = results;
1036 if (!start_active_slot(slot)) {
1037 snprintf(curl_errorstr, sizeof(curl_errorstr),
1038 "failed to start HTTP request");
1039 return HTTP_START_FAILED;
1040 }
1041
1042 run_active_slot(slot);
1043 return handle_curl_result(results);
1044 }
1045
1046 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1047 {
1048 char *ptr;
1049 CURLcode ret;
1050
1051 strbuf_reset(buf);
1052 ret = curl_easy_getinfo(curl, info, &ptr);
1053 if (!ret && ptr)
1054 strbuf_addstr(buf, ptr);
1055 return ret;
1056 }
1057
1058 /*
1059 * Check for and extract a content-type parameter. "raw"
1060 * should be positioned at the start of the potential
1061 * parameter, with any whitespace already removed.
1062 *
1063 * "name" is the name of the parameter. The value is appended
1064 * to "out".
1065 */
1066 static int extract_param(const char *raw, const char *name,
1067 struct strbuf *out)
1068 {
1069 size_t len = strlen(name);
1070
1071 if (strncasecmp(raw, name, len))
1072 return -1;
1073 raw += len;
1074
1075 if (*raw != '=')
1076 return -1;
1077 raw++;
1078
1079 while (*raw && !isspace(*raw) && *raw != ';')
1080 strbuf_addch(out, *raw++);
1081 return 0;
1082 }
1083
1084 /*
1085 * Extract a normalized version of the content type, with any
1086 * spaces suppressed, all letters lowercased, and no trailing ";"
1087 * or parameters.
1088 *
1089 * Note that we will silently remove even invalid whitespace. For
1090 * example, "text / plain" is specifically forbidden by RFC 2616,
1091 * but "text/plain" is the only reasonable output, and this keeps
1092 * our code simple.
1093 *
1094 * If the "charset" argument is not NULL, store the value of any
1095 * charset parameter there.
1096 *
1097 * Example:
1098 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1099 * "text / plain" -> "text/plain"
1100 */
1101 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1102 struct strbuf *charset)
1103 {
1104 const char *p;
1105
1106 strbuf_reset(type);
1107 strbuf_grow(type, raw->len);
1108 for (p = raw->buf; *p; p++) {
1109 if (isspace(*p))
1110 continue;
1111 if (*p == ';') {
1112 p++;
1113 break;
1114 }
1115 strbuf_addch(type, tolower(*p));
1116 }
1117
1118 if (!charset)
1119 return;
1120
1121 strbuf_reset(charset);
1122 while (*p) {
1123 while (isspace(*p) || *p == ';')
1124 p++;
1125 if (!extract_param(p, "charset", charset))
1126 return;
1127 while (*p && !isspace(*p))
1128 p++;
1129 }
1130
1131 if (!charset->len && starts_with(type->buf, "text/"))
1132 strbuf_addstr(charset, "ISO-8859-1");
1133 }
1134
1135 static void write_accept_language(struct strbuf *buf)
1136 {
1137 /*
1138 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1139 * that, q-value will be smaller than 0.001, the minimum q-value the
1140 * HTTP specification allows. See
1141 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1142 */
1143 const int MAX_DECIMAL_PLACES = 3;
1144 const int MAX_LANGUAGE_TAGS = 1000;
1145 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1146 char **language_tags = NULL;
1147 int num_langs = 0;
1148 const char *s = get_preferred_languages();
1149 int i;
1150 struct strbuf tag = STRBUF_INIT;
1151
1152 /* Don't add Accept-Language header if no language is preferred. */
1153 if (!s)
1154 return;
1155
1156 /*
1157 * Split the colon-separated string of preferred languages into
1158 * language_tags array.
1159 */
1160 do {
1161 /* collect language tag */
1162 for (; *s && (isalnum(*s) || *s == '_'); s++)
1163 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1164
1165 /* skip .codeset, @modifier and any other unnecessary parts */
1166 while (*s && *s != ':')
1167 s++;
1168
1169 if (tag.len) {
1170 num_langs++;
1171 REALLOC_ARRAY(language_tags, num_langs);
1172 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1173 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1174 break;
1175 }
1176 } while (*s++);
1177
1178 /* write Accept-Language header into buf */
1179 if (num_langs) {
1180 int last_buf_len = 0;
1181 int max_q;
1182 int decimal_places;
1183 char q_format[32];
1184
1185 /* add '*' */
1186 REALLOC_ARRAY(language_tags, num_langs + 1);
1187 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1188
1189 /* compute decimal_places */
1190 for (max_q = 1, decimal_places = 0;
1191 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1192 decimal_places++, max_q *= 10)
1193 ;
1194
1195 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1196
1197 strbuf_addstr(buf, "Accept-Language: ");
1198
1199 for (i = 0; i < num_langs; i++) {
1200 if (i > 0)
1201 strbuf_addstr(buf, ", ");
1202
1203 strbuf_addstr(buf, language_tags[i]);
1204
1205 if (i > 0)
1206 strbuf_addf(buf, q_format, max_q - i);
1207
1208 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1209 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1210 break;
1211 }
1212
1213 last_buf_len = buf->len;
1214 }
1215 }
1216
1217 /* free language tags -- last one is a static '*' */
1218 for (i = 0; i < num_langs - 1; i++)
1219 free(language_tags[i]);
1220 free(language_tags);
1221 }
1222
1223 /*
1224 * Get an Accept-Language header which indicates user's preferred languages.
1225 *
1226 * Examples:
1227 * LANGUAGE= -> ""
1228 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1229 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1230 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1231 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1232 * LANGUAGE= LANG=C -> ""
1233 */
1234 static const char *get_accept_language(void)
1235 {
1236 if (!cached_accept_language) {
1237 struct strbuf buf = STRBUF_INIT;
1238 write_accept_language(&buf);
1239 if (buf.len > 0)
1240 cached_accept_language = strbuf_detach(&buf, NULL);
1241 }
1242
1243 return cached_accept_language;
1244 }
1245
1246 static void http_opt_request_remainder(CURL *curl, off_t pos)
1247 {
1248 char buf[128];
1249 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1250 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1251 }
1252
1253 /* http_request() targets */
1254 #define HTTP_REQUEST_STRBUF 0
1255 #define HTTP_REQUEST_FILE 1
1256
1257 static int http_request(const char *url,
1258 void *result, int target,
1259 const struct http_get_options *options)
1260 {
1261 struct active_request_slot *slot;
1262 struct slot_results results;
1263 struct curl_slist *headers = NULL;
1264 struct strbuf buf = STRBUF_INIT;
1265 const char *accept_language;
1266 int ret;
1267
1268 slot = get_active_slot();
1269 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1270
1271 if (result == NULL) {
1272 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1273 } else {
1274 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1275 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1276
1277 if (target == HTTP_REQUEST_FILE) {
1278 off_t posn = ftello(result);
1279 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1280 fwrite);
1281 if (posn > 0)
1282 http_opt_request_remainder(slot->curl, posn);
1283 } else
1284 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1285 fwrite_buffer);
1286 }
1287
1288 accept_language = get_accept_language();
1289
1290 if (accept_language)
1291 headers = curl_slist_append(headers, accept_language);
1292
1293 strbuf_addstr(&buf, "Pragma:");
1294 if (options && options->no_cache)
1295 strbuf_addstr(&buf, " no-cache");
1296 if (options && options->keep_error)
1297 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1298
1299 headers = curl_slist_append(headers, buf.buf);
1300
1301 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1302 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1303 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1304
1305 ret = run_one_slot(slot, &results);
1306
1307 if (options && options->content_type) {
1308 struct strbuf raw = STRBUF_INIT;
1309 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1310 extract_content_type(&raw, options->content_type,
1311 options->charset);
1312 strbuf_release(&raw);
1313 }
1314
1315 if (options && options->effective_url)
1316 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1317 options->effective_url);
1318
1319 curl_slist_free_all(headers);
1320 strbuf_release(&buf);
1321
1322 return ret;
1323 }
1324
1325 /*
1326 * Update the "base" url to a more appropriate value, as deduced by
1327 * redirects seen when requesting a URL starting with "url".
1328 *
1329 * The "asked" parameter is a URL that we asked curl to access, and must begin
1330 * with "base".
1331 *
1332 * The "got" parameter is the URL that curl reported to us as where we ended
1333 * up.
1334 *
1335 * Returns 1 if we updated the base url, 0 otherwise.
1336 *
1337 * Our basic strategy is to compare "base" and "asked" to find the bits
1338 * specific to our request. We then strip those bits off of "got" to yield the
1339 * new base. So for example, if our base is "http://example.com/foo.git",
1340 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1341 * with "https://other.example.com/foo.git/info/refs". We would want the
1342 * new URL to become "https://other.example.com/foo.git".
1343 *
1344 * Note that this assumes a sane redirect scheme. It's entirely possible
1345 * in the example above to end up at a URL that does not even end in
1346 * "info/refs". In such a case we simply punt, as there is not much we can
1347 * do (and such a scheme is unlikely to represent a real git repository,
1348 * which means we are likely about to abort anyway).
1349 */
1350 static int update_url_from_redirect(struct strbuf *base,
1351 const char *asked,
1352 const struct strbuf *got)
1353 {
1354 const char *tail;
1355 size_t tail_len;
1356
1357 if (!strcmp(asked, got->buf))
1358 return 0;
1359
1360 if (!skip_prefix(asked, base->buf, &tail))
1361 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1362 asked, base->buf);
1363
1364 tail_len = strlen(tail);
1365
1366 if (got->len < tail_len ||
1367 strcmp(tail, got->buf + got->len - tail_len))
1368 return 0; /* insane redirect scheme */
1369
1370 strbuf_reset(base);
1371 strbuf_add(base, got->buf, got->len - tail_len);
1372 return 1;
1373 }
1374
1375 static int http_request_reauth(const char *url,
1376 void *result, int target,
1377 struct http_get_options *options)
1378 {
1379 int ret = http_request(url, result, target, options);
1380
1381 if (options && options->effective_url && options->base_url) {
1382 if (update_url_from_redirect(options->base_url,
1383 url, options->effective_url)) {
1384 credential_from_url(&http_auth, options->base_url->buf);
1385 url = options->effective_url->buf;
1386 }
1387 }
1388
1389 if (ret != HTTP_REAUTH)
1390 return ret;
1391
1392 /*
1393 * If we are using KEEP_ERROR, the previous request may have
1394 * put cruft into our output stream; we should clear it out before
1395 * making our next request. We only know how to do this for
1396 * the strbuf case, but that is enough to satisfy current callers.
1397 */
1398 if (options && options->keep_error) {
1399 switch (target) {
1400 case HTTP_REQUEST_STRBUF:
1401 strbuf_reset(result);
1402 break;
1403 default:
1404 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1405 }
1406 }
1407
1408 credential_fill(&http_auth);
1409
1410 return http_request(url, result, target, options);
1411 }
1412
1413 int http_get_strbuf(const char *url,
1414 struct strbuf *result,
1415 struct http_get_options *options)
1416 {
1417 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1418 }
1419
1420 /*
1421 * Downloads a URL and stores the result in the given file.
1422 *
1423 * If a previous interrupted download is detected (i.e. a previous temporary
1424 * file is still around) the download is resumed.
1425 */
1426 static int http_get_file(const char *url, const char *filename,
1427 struct http_get_options *options)
1428 {
1429 int ret;
1430 struct strbuf tmpfile = STRBUF_INIT;
1431 FILE *result;
1432
1433 strbuf_addf(&tmpfile, "%s.temp", filename);
1434 result = fopen(tmpfile.buf, "a");
1435 if (!result) {
1436 error("Unable to open local file %s", tmpfile.buf);
1437 ret = HTTP_ERROR;
1438 goto cleanup;
1439 }
1440
1441 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1442 fclose(result);
1443
1444 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1445 ret = HTTP_ERROR;
1446 cleanup:
1447 strbuf_release(&tmpfile);
1448 return ret;
1449 }
1450
1451 int http_fetch_ref(const char *base, struct ref *ref)
1452 {
1453 struct http_get_options options = {0};
1454 char *url;
1455 struct strbuf buffer = STRBUF_INIT;
1456 int ret = -1;
1457
1458 options.no_cache = 1;
1459
1460 url = quote_ref_url(base, ref->name);
1461 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1462 strbuf_rtrim(&buffer);
1463 if (buffer.len == 40)
1464 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1465 else if (starts_with(buffer.buf, "ref: ")) {
1466 ref->symref = xstrdup(buffer.buf + 5);
1467 ret = 0;
1468 }
1469 }
1470
1471 strbuf_release(&buffer);
1472 free(url);
1473 return ret;
1474 }
1475
1476 /* Helpers for fetching packs */
1477 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1478 {
1479 char *url, *tmp;
1480 struct strbuf buf = STRBUF_INIT;
1481
1482 if (http_is_verbose)
1483 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1484
1485 end_url_with_slash(&buf, base_url);
1486 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1487 url = strbuf_detach(&buf, NULL);
1488
1489 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1490 tmp = strbuf_detach(&buf, NULL);
1491
1492 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1493 error("Unable to get pack index %s", url);
1494 free(tmp);
1495 tmp = NULL;
1496 }
1497
1498 free(url);
1499 return tmp;
1500 }
1501
1502 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1503 unsigned char *sha1, const char *base_url)
1504 {
1505 struct packed_git *new_pack;
1506 char *tmp_idx = NULL;
1507 int ret;
1508
1509 if (has_pack_index(sha1)) {
1510 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1511 if (!new_pack)
1512 return -1; /* parse_pack_index() already issued error message */
1513 goto add_pack;
1514 }
1515
1516 tmp_idx = fetch_pack_index(sha1, base_url);
1517 if (!tmp_idx)
1518 return -1;
1519
1520 new_pack = parse_pack_index(sha1, tmp_idx);
1521 if (!new_pack) {
1522 unlink(tmp_idx);
1523 free(tmp_idx);
1524
1525 return -1; /* parse_pack_index() already issued error message */
1526 }
1527
1528 ret = verify_pack_index(new_pack);
1529 if (!ret) {
1530 close_pack_index(new_pack);
1531 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1532 }
1533 free(tmp_idx);
1534 if (ret)
1535 return -1;
1536
1537 add_pack:
1538 new_pack->next = *packs_head;
1539 *packs_head = new_pack;
1540 return 0;
1541 }
1542
1543 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1544 {
1545 struct http_get_options options = {0};
1546 int ret = 0, i = 0;
1547 char *url, *data;
1548 struct strbuf buf = STRBUF_INIT;
1549 unsigned char sha1[20];
1550
1551 end_url_with_slash(&buf, base_url);
1552 strbuf_addstr(&buf, "objects/info/packs");
1553 url = strbuf_detach(&buf, NULL);
1554
1555 options.no_cache = 1;
1556 ret = http_get_strbuf(url, &buf, &options);
1557 if (ret != HTTP_OK)
1558 goto cleanup;
1559
1560 data = buf.buf;
1561 while (i < buf.len) {
1562 switch (data[i]) {
1563 case 'P':
1564 i++;
1565 if (i + 52 <= buf.len &&
1566 starts_with(data + i, " pack-") &&
1567 starts_with(data + i + 46, ".pack\n")) {
1568 get_sha1_hex(data + i + 6, sha1);
1569 fetch_and_setup_pack_index(packs_head, sha1,
1570 base_url);
1571 i += 51;
1572 break;
1573 }
1574 default:
1575 while (i < buf.len && data[i] != '\n')
1576 i++;
1577 }
1578 i++;
1579 }
1580
1581 cleanup:
1582 free(url);
1583 return ret;
1584 }
1585
1586 void release_http_pack_request(struct http_pack_request *preq)
1587 {
1588 if (preq->packfile != NULL) {
1589 fclose(preq->packfile);
1590 preq->packfile = NULL;
1591 }
1592 preq->slot = NULL;
1593 free(preq->url);
1594 free(preq);
1595 }
1596
1597 int finish_http_pack_request(struct http_pack_request *preq)
1598 {
1599 struct packed_git **lst;
1600 struct packed_git *p = preq->target;
1601 char *tmp_idx;
1602 size_t len;
1603 struct child_process ip = CHILD_PROCESS_INIT;
1604 const char *ip_argv[8];
1605
1606 close_pack_index(p);
1607
1608 fclose(preq->packfile);
1609 preq->packfile = NULL;
1610
1611 lst = preq->lst;
1612 while (*lst != p)
1613 lst = &((*lst)->next);
1614 *lst = (*lst)->next;
1615
1616 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1617 die("BUG: pack tmpfile does not end in .pack.temp?");
1618 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1619
1620 ip_argv[0] = "index-pack";
1621 ip_argv[1] = "-o";
1622 ip_argv[2] = tmp_idx;
1623 ip_argv[3] = preq->tmpfile;
1624 ip_argv[4] = NULL;
1625
1626 ip.argv = ip_argv;
1627 ip.git_cmd = 1;
1628 ip.no_stdin = 1;
1629 ip.no_stdout = 1;
1630
1631 if (run_command(&ip)) {
1632 unlink(preq->tmpfile);
1633 unlink(tmp_idx);
1634 free(tmp_idx);
1635 return -1;
1636 }
1637
1638 unlink(sha1_pack_index_name(p->sha1));
1639
1640 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1641 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1642 free(tmp_idx);
1643 return -1;
1644 }
1645
1646 install_packed_git(p);
1647 free(tmp_idx);
1648 return 0;
1649 }
1650
1651 struct http_pack_request *new_http_pack_request(
1652 struct packed_git *target, const char *base_url)
1653 {
1654 off_t prev_posn = 0;
1655 struct strbuf buf = STRBUF_INIT;
1656 struct http_pack_request *preq;
1657
1658 preq = xcalloc(1, sizeof(*preq));
1659 preq->target = target;
1660
1661 end_url_with_slash(&buf, base_url);
1662 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1663 sha1_to_hex(target->sha1));
1664 preq->url = strbuf_detach(&buf, NULL);
1665
1666 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1667 sha1_pack_name(target->sha1));
1668 preq->packfile = fopen(preq->tmpfile, "a");
1669 if (!preq->packfile) {
1670 error("Unable to open local file %s for pack",
1671 preq->tmpfile);
1672 goto abort;
1673 }
1674
1675 preq->slot = get_active_slot();
1676 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1677 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1678 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1679 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1680 no_pragma_header);
1681
1682 /*
1683 * If there is data present from a previous transfer attempt,
1684 * resume where it left off
1685 */
1686 prev_posn = ftello(preq->packfile);
1687 if (prev_posn>0) {
1688 if (http_is_verbose)
1689 fprintf(stderr,
1690 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1691 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1692 http_opt_request_remainder(preq->slot->curl, prev_posn);
1693 }
1694
1695 return preq;
1696
1697 abort:
1698 free(preq->url);
1699 free(preq);
1700 return NULL;
1701 }
1702
1703 /* Helpers for fetching objects (loose) */
1704 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
1705 void *data)
1706 {
1707 unsigned char expn[4096];
1708 size_t size = eltsize * nmemb;
1709 int posn = 0;
1710 struct http_object_request *freq =
1711 (struct http_object_request *)data;
1712 do {
1713 ssize_t retval = xwrite(freq->localfile,
1714 (char *) ptr + posn, size - posn);
1715 if (retval < 0)
1716 return posn;
1717 posn += retval;
1718 } while (posn < size);
1719
1720 freq->stream.avail_in = size;
1721 freq->stream.next_in = (void *)ptr;
1722 do {
1723 freq->stream.next_out = expn;
1724 freq->stream.avail_out = sizeof(expn);
1725 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
1726 git_SHA1_Update(&freq->c, expn,
1727 sizeof(expn) - freq->stream.avail_out);
1728 } while (freq->stream.avail_in && freq->zret == Z_OK);
1729 return size;
1730 }
1731
1732 struct http_object_request *new_http_object_request(const char *base_url,
1733 unsigned char *sha1)
1734 {
1735 char *hex = sha1_to_hex(sha1);
1736 const char *filename;
1737 char prevfile[PATH_MAX];
1738 int prevlocal;
1739 char prev_buf[PREV_BUF_SIZE];
1740 ssize_t prev_read = 0;
1741 off_t prev_posn = 0;
1742 struct http_object_request *freq;
1743
1744 freq = xcalloc(1, sizeof(*freq));
1745 hashcpy(freq->sha1, sha1);
1746 freq->localfile = -1;
1747
1748 filename = sha1_file_name(sha1);
1749 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
1750 "%s.temp", filename);
1751
1752 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
1753 unlink_or_warn(prevfile);
1754 rename(freq->tmpfile, prevfile);
1755 unlink_or_warn(freq->tmpfile);
1756
1757 if (freq->localfile != -1)
1758 error("fd leakage in start: %d", freq->localfile);
1759 freq->localfile = open(freq->tmpfile,
1760 O_WRONLY | O_CREAT | O_EXCL, 0666);
1761 /*
1762 * This could have failed due to the "lazy directory creation";
1763 * try to mkdir the last path component.
1764 */
1765 if (freq->localfile < 0 && errno == ENOENT) {
1766 char *dir = strrchr(freq->tmpfile, '/');
1767 if (dir) {
1768 *dir = 0;
1769 mkdir(freq->tmpfile, 0777);
1770 *dir = '/';
1771 }
1772 freq->localfile = open(freq->tmpfile,
1773 O_WRONLY | O_CREAT | O_EXCL, 0666);
1774 }
1775
1776 if (freq->localfile < 0) {
1777 error("Couldn't create temporary file %s: %s",
1778 freq->tmpfile, strerror(errno));
1779 goto abort;
1780 }
1781
1782 git_inflate_init(&freq->stream);
1783
1784 git_SHA1_Init(&freq->c);
1785
1786 freq->url = get_remote_object_url(base_url, hex, 0);
1787
1788 /*
1789 * If a previous temp file is present, process what was already
1790 * fetched.
1791 */
1792 prevlocal = open(prevfile, O_RDONLY);
1793 if (prevlocal != -1) {
1794 do {
1795 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
1796 if (prev_read>0) {
1797 if (fwrite_sha1_file(prev_buf,
1798 1,
1799 prev_read,
1800 freq) == prev_read) {
1801 prev_posn += prev_read;
1802 } else {
1803 prev_read = -1;
1804 }
1805 }
1806 } while (prev_read > 0);
1807 close(prevlocal);
1808 }
1809 unlink_or_warn(prevfile);
1810
1811 /*
1812 * Reset inflate/SHA1 if there was an error reading the previous temp
1813 * file; also rewind to the beginning of the local file.
1814 */
1815 if (prev_read == -1) {
1816 memset(&freq->stream, 0, sizeof(freq->stream));
1817 git_inflate_init(&freq->stream);
1818 git_SHA1_Init(&freq->c);
1819 if (prev_posn>0) {
1820 prev_posn = 0;
1821 lseek(freq->localfile, 0, SEEK_SET);
1822 if (ftruncate(freq->localfile, 0) < 0) {
1823 error("Couldn't truncate temporary file %s: %s",
1824 freq->tmpfile, strerror(errno));
1825 goto abort;
1826 }
1827 }
1828 }
1829
1830 freq->slot = get_active_slot();
1831
1832 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
1833 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
1834 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
1835 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
1836 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
1837
1838 /*
1839 * If we have successfully processed data from a previous fetch
1840 * attempt, only fetch the data we don't already have.
1841 */
1842 if (prev_posn>0) {
1843 if (http_is_verbose)
1844 fprintf(stderr,
1845 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
1846 hex, (uintmax_t)prev_posn);
1847 http_opt_request_remainder(freq->slot->curl, prev_posn);
1848 }
1849
1850 return freq;
1851
1852 abort:
1853 free(freq->url);
1854 free(freq);
1855 return NULL;
1856 }
1857
1858 void process_http_object_request(struct http_object_request *freq)
1859 {
1860 if (freq->slot == NULL)
1861 return;
1862 freq->curl_result = freq->slot->curl_result;
1863 freq->http_code = freq->slot->http_code;
1864 freq->slot = NULL;
1865 }
1866
1867 int finish_http_object_request(struct http_object_request *freq)
1868 {
1869 struct stat st;
1870
1871 close(freq->localfile);
1872 freq->localfile = -1;
1873
1874 process_http_object_request(freq);
1875
1876 if (freq->http_code == 416) {
1877 warning("requested range invalid; we may already have all the data.");
1878 } else if (freq->curl_result != CURLE_OK) {
1879 if (stat(freq->tmpfile, &st) == 0)
1880 if (st.st_size == 0)
1881 unlink_or_warn(freq->tmpfile);
1882 return -1;
1883 }
1884
1885 git_inflate_end(&freq->stream);
1886 git_SHA1_Final(freq->real_sha1, &freq->c);
1887 if (freq->zret != Z_STREAM_END) {
1888 unlink_or_warn(freq->tmpfile);
1889 return -1;
1890 }
1891 if (hashcmp(freq->sha1, freq->real_sha1)) {
1892 unlink_or_warn(freq->tmpfile);
1893 return -1;
1894 }
1895 freq->rename =
1896 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
1897
1898 return freq->rename;
1899 }
1900
1901 void abort_http_object_request(struct http_object_request *freq)
1902 {
1903 unlink_or_warn(freq->tmpfile);
1904
1905 release_http_object_request(freq);
1906 }
1907
1908 void release_http_object_request(struct http_object_request *freq)
1909 {
1910 if (freq->localfile != -1) {
1911 close(freq->localfile);
1912 freq->localfile = -1;
1913 }
1914 if (freq->url != NULL) {
1915 free(freq->url);
1916 freq->url = NULL;
1917 }
1918 if (freq->slot != NULL) {
1919 freq->slot->callback_func = NULL;
1920 freq->slot->callback_data = NULL;
1921 release_active_slot(freq->slot);
1922 freq->slot = NULL;
1923 }
1924 }
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