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Git 2.17.3
[git.git] / http.c
bloba5bd5d62c22c054f82b9971fc1f320c643f1d6fb
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "config.h"
4 #include "pack.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "url.h"
8 #include "urlmatch.h"
9 #include "credential.h"
10 #include "version.h"
11 #include "pkt-line.h"
12 #include "gettext.h"
13 #include "transport.h"
14 #include "packfile.h"
15 #include "protocol.h"
16 #include "string-list.h"
17
18 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
19 static int trace_curl_data = 1;
20 static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
21 #if LIBCURL_VERSION_NUM >= 0x070a08
22 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
23 #else
24 long int git_curl_ipresolve;
25 #endif
26 int active_requests;
27 int http_is_verbose;
28 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
29
30 #if LIBCURL_VERSION_NUM >= 0x070a06
31 #define LIBCURL_CAN_HANDLE_AUTH_ANY
32 #endif
33
34 static int min_curl_sessions = 1;
35 static int curl_session_count;
36 #ifdef USE_CURL_MULTI
37 static int max_requests = -1;
38 static CURLM *curlm;
39 #endif
40 #ifndef NO_CURL_EASY_DUPHANDLE
41 static CURL *curl_default;
42 #endif
43
44 #define PREV_BUF_SIZE 4096
45
46 char curl_errorstr[CURL_ERROR_SIZE];
47
48 static int curl_ssl_verify = -1;
49 static int curl_ssl_try;
50 static const char *ssl_cert;
51 static const char *ssl_cipherlist;
52 static const char *ssl_version;
53 static struct {
54 const char *name;
55 long ssl_version;
56 } sslversions[] = {
57 { "sslv2", CURL_SSLVERSION_SSLv2 },
58 { "sslv3", CURL_SSLVERSION_SSLv3 },
59 { "tlsv1", CURL_SSLVERSION_TLSv1 },
60 #if LIBCURL_VERSION_NUM >= 0x072200
61 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
62 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
63 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
64 #endif
65 };
66 #if LIBCURL_VERSION_NUM >= 0x070903
67 static const char *ssl_key;
68 #endif
69 #if LIBCURL_VERSION_NUM >= 0x070908
70 static const char *ssl_capath;
71 #endif
72 #if LIBCURL_VERSION_NUM >= 0x071304
73 static const char *curl_no_proxy;
74 #endif
75 #if LIBCURL_VERSION_NUM >= 0x072c00
76 static const char *ssl_pinnedkey;
77 #endif
78 static const char *ssl_cainfo;
79 static long curl_low_speed_limit = -1;
80 static long curl_low_speed_time = -1;
81 static int curl_ftp_no_epsv;
82 static const char *curl_http_proxy;
83 static const char *http_proxy_authmethod;
84 static struct {
85 const char *name;
86 long curlauth_param;
87 } proxy_authmethods[] = {
88 { "basic", CURLAUTH_BASIC },
89 { "digest", CURLAUTH_DIGEST },
90 { "negotiate", CURLAUTH_GSSNEGOTIATE },
91 { "ntlm", CURLAUTH_NTLM },
92 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
93 { "anyauth", CURLAUTH_ANY },
94 #endif
95 /*
96 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
97 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
98 * here, too
99 */
100 };
101 #ifdef CURLGSSAPI_DELEGATION_FLAG
102 static const char *curl_deleg;
103 static struct {
104 const char *name;
105 long curl_deleg_param;
106 } curl_deleg_levels[] = {
107 { "none", CURLGSSAPI_DELEGATION_NONE },
108 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
109 { "always", CURLGSSAPI_DELEGATION_FLAG },
110 };
111 #endif
112
113 static struct credential proxy_auth = CREDENTIAL_INIT;
114 static const char *curl_proxyuserpwd;
115 static const char *curl_cookie_file;
116 static int curl_save_cookies;
117 struct credential http_auth = CREDENTIAL_INIT;
118 static int http_proactive_auth;
119 static const char *user_agent;
120 static int curl_empty_auth = -1;
121
122 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
123
124 #if LIBCURL_VERSION_NUM >= 0x071700
125 /* Use CURLOPT_KEYPASSWD as is */
126 #elif LIBCURL_VERSION_NUM >= 0x070903
127 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
128 #else
129 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
130 #endif
131
132 static struct credential cert_auth = CREDENTIAL_INIT;
133 static int ssl_cert_password_required;
134 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
135 static unsigned long http_auth_methods = CURLAUTH_ANY;
136 static int http_auth_methods_restricted;
137 /* Modes for which empty_auth cannot actually help us. */
138 static unsigned long empty_auth_useless =
139 CURLAUTH_BASIC
140 #ifdef CURLAUTH_DIGEST_IE
141 | CURLAUTH_DIGEST_IE
142 #endif
143 | CURLAUTH_DIGEST;
144 #endif
145
146 static struct curl_slist *pragma_header;
147 static struct curl_slist *no_pragma_header;
148 static struct curl_slist *extra_http_headers;
149
150 static struct active_request_slot *active_queue_head;
151
152 static char *cached_accept_language;
153
154 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
155 {
156 size_t size = eltsize * nmemb;
157 struct buffer *buffer = buffer_;
158
159 if (size > buffer->buf.len - buffer->posn)
160 size = buffer->buf.len - buffer->posn;
161 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
162 buffer->posn += size;
163
164 return size;
165 }
166
167 #ifndef NO_CURL_IOCTL
168 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
169 {
170 struct buffer *buffer = clientp;
171
172 switch (cmd) {
173 case CURLIOCMD_NOP:
174 return CURLIOE_OK;
175
176 case CURLIOCMD_RESTARTREAD:
177 buffer->posn = 0;
178 return CURLIOE_OK;
179
180 default:
181 return CURLIOE_UNKNOWNCMD;
182 }
183 }
184 #endif
185
186 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
187 {
188 size_t size = eltsize * nmemb;
189 struct strbuf *buffer = buffer_;
190
191 strbuf_add(buffer, ptr, size);
192 return size;
193 }
194
195 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
196 {
197 return eltsize * nmemb;
198 }
199
200 static void closedown_active_slot(struct active_request_slot *slot)
201 {
202 active_requests--;
203 slot->in_use = 0;
204 }
205
206 static void finish_active_slot(struct active_request_slot *slot)
207 {
208 closedown_active_slot(slot);
209 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
210
211 if (slot->finished != NULL)
212 (*slot->finished) = 1;
213
214 /* Store slot results so they can be read after the slot is reused */
215 if (slot->results != NULL) {
216 slot->results->curl_result = slot->curl_result;
217 slot->results->http_code = slot->http_code;
218 #if LIBCURL_VERSION_NUM >= 0x070a08
219 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
220 &slot->results->auth_avail);
221 #else
222 slot->results->auth_avail = 0;
223 #endif
224
225 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
226 &slot->results->http_connectcode);
227 }
228
229 /* Run callback if appropriate */
230 if (slot->callback_func != NULL)
231 slot->callback_func(slot->callback_data);
232 }
233
234 static void xmulti_remove_handle(struct active_request_slot *slot)
235 {
236 #ifdef USE_CURL_MULTI
237 curl_multi_remove_handle(curlm, slot->curl);
238 #endif
239 }
240
241 #ifdef USE_CURL_MULTI
242 static void process_curl_messages(void)
243 {
244 int num_messages;
245 struct active_request_slot *slot;
246 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
247
248 while (curl_message != NULL) {
249 if (curl_message->msg == CURLMSG_DONE) {
250 int curl_result = curl_message->data.result;
251 slot = active_queue_head;
252 while (slot != NULL &&
253 slot->curl != curl_message->easy_handle)
254 slot = slot->next;
255 if (slot != NULL) {
256 xmulti_remove_handle(slot);
257 slot->curl_result = curl_result;
258 finish_active_slot(slot);
259 } else {
260 fprintf(stderr, "Received DONE message for unknown request!\n");
261 }
262 } else {
263 fprintf(stderr, "Unknown CURL message received: %d\n",
264 (int)curl_message->msg);
265 }
266 curl_message = curl_multi_info_read(curlm, &num_messages);
267 }
268 }
269 #endif
270
271 static int http_options(const char *var, const char *value, void *cb)
272 {
273 if (!strcmp("http.sslverify", var)) {
274 curl_ssl_verify = git_config_bool(var, value);
275 return 0;
276 }
277 if (!strcmp("http.sslcipherlist", var))
278 return git_config_string(&ssl_cipherlist, var, value);
279 if (!strcmp("http.sslversion", var))
280 return git_config_string(&ssl_version, var, value);
281 if (!strcmp("http.sslcert", var))
282 return git_config_pathname(&ssl_cert, var, value);
283 #if LIBCURL_VERSION_NUM >= 0x070903
284 if (!strcmp("http.sslkey", var))
285 return git_config_pathname(&ssl_key, var, value);
286 #endif
287 #if LIBCURL_VERSION_NUM >= 0x070908
288 if (!strcmp("http.sslcapath", var))
289 return git_config_pathname(&ssl_capath, var, value);
290 #endif
291 if (!strcmp("http.sslcainfo", var))
292 return git_config_pathname(&ssl_cainfo, var, value);
293 if (!strcmp("http.sslcertpasswordprotected", var)) {
294 ssl_cert_password_required = git_config_bool(var, value);
295 return 0;
296 }
297 if (!strcmp("http.ssltry", var)) {
298 curl_ssl_try = git_config_bool(var, value);
299 return 0;
300 }
301 if (!strcmp("http.minsessions", var)) {
302 min_curl_sessions = git_config_int(var, value);
303 #ifndef USE_CURL_MULTI
304 if (min_curl_sessions > 1)
305 min_curl_sessions = 1;
306 #endif
307 return 0;
308 }
309 #ifdef USE_CURL_MULTI
310 if (!strcmp("http.maxrequests", var)) {
311 max_requests = git_config_int(var, value);
312 return 0;
313 }
314 #endif
315 if (!strcmp("http.lowspeedlimit", var)) {
316 curl_low_speed_limit = (long)git_config_int(var, value);
317 return 0;
318 }
319 if (!strcmp("http.lowspeedtime", var)) {
320 curl_low_speed_time = (long)git_config_int(var, value);
321 return 0;
322 }
323
324 if (!strcmp("http.noepsv", var)) {
325 curl_ftp_no_epsv = git_config_bool(var, value);
326 return 0;
327 }
328 if (!strcmp("http.proxy", var))
329 return git_config_string(&curl_http_proxy, var, value);
330
331 if (!strcmp("http.proxyauthmethod", var))
332 return git_config_string(&http_proxy_authmethod, var, value);
333
334 if (!strcmp("http.cookiefile", var))
335 return git_config_pathname(&curl_cookie_file, var, value);
336 if (!strcmp("http.savecookies", var)) {
337 curl_save_cookies = git_config_bool(var, value);
338 return 0;
339 }
340
341 if (!strcmp("http.postbuffer", var)) {
342 http_post_buffer = git_config_ssize_t(var, value);
343 if (http_post_buffer < 0)
344 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
345 if (http_post_buffer < LARGE_PACKET_MAX)
346 http_post_buffer = LARGE_PACKET_MAX;
347 return 0;
348 }
349
350 if (!strcmp("http.useragent", var))
351 return git_config_string(&user_agent, var, value);
352
353 if (!strcmp("http.emptyauth", var)) {
354 if (value && !strcmp("auto", value))
355 curl_empty_auth = -1;
356 else
357 curl_empty_auth = git_config_bool(var, value);
358 return 0;
359 }
360
361 if (!strcmp("http.delegation", var)) {
362 #ifdef CURLGSSAPI_DELEGATION_FLAG
363 return git_config_string(&curl_deleg, var, value);
364 #else
365 warning(_("Delegation control is not supported with cURL < 7.22.0"));
366 return 0;
367 #endif
368 }
369
370 if (!strcmp("http.pinnedpubkey", var)) {
371 #if LIBCURL_VERSION_NUM >= 0x072c00
372 return git_config_pathname(&ssl_pinnedkey, var, value);
373 #else
374 warning(_("Public key pinning not supported with cURL < 7.44.0"));
375 return 0;
376 #endif
377 }
378
379 if (!strcmp("http.extraheader", var)) {
380 if (!value) {
381 return config_error_nonbool(var);
382 } else if (!*value) {
383 curl_slist_free_all(extra_http_headers);
384 extra_http_headers = NULL;
385 } else {
386 extra_http_headers =
387 curl_slist_append(extra_http_headers, value);
388 }
389 return 0;
390 }
391
392 if (!strcmp("http.followredirects", var)) {
393 if (value && !strcmp(value, "initial"))
394 http_follow_config = HTTP_FOLLOW_INITIAL;
395 else if (git_config_bool(var, value))
396 http_follow_config = HTTP_FOLLOW_ALWAYS;
397 else
398 http_follow_config = HTTP_FOLLOW_NONE;
399 return 0;
400 }
401
402 /* Fall back on the default ones */
403 return git_default_config(var, value, cb);
404 }
405
406 static int curl_empty_auth_enabled(void)
407 {
408 if (curl_empty_auth >= 0)
409 return curl_empty_auth;
410
411 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
412 /*
413 * Our libcurl is too old to do AUTH_ANY in the first place;
414 * just default to turning the feature off.
415 */
416 #else
417 /*
418 * In the automatic case, kick in the empty-auth
419 * hack as long as we would potentially try some
420 * method more exotic than "Basic" or "Digest".
421 *
422 * But only do this when this is our second or
423 * subsequent request, as by then we know what
424 * methods are available.
425 */
426 if (http_auth_methods_restricted &&
427 (http_auth_methods & ~empty_auth_useless))
428 return 1;
429 #endif
430 return 0;
431 }
432
433 static void init_curl_http_auth(CURL *result)
434 {
435 if (!http_auth.username || !*http_auth.username) {
436 if (curl_empty_auth_enabled())
437 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
438 return;
439 }
440
441 credential_fill(&http_auth);
442
443 #if LIBCURL_VERSION_NUM >= 0x071301
444 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
445 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
446 #else
447 {
448 static struct strbuf up = STRBUF_INIT;
449 /*
450 * Note that we assume we only ever have a single set of
451 * credentials in a given program run, so we do not have
452 * to worry about updating this buffer, only setting its
453 * initial value.
454 */
455 if (!up.len)
456 strbuf_addf(&up, "%s:%s",
457 http_auth.username, http_auth.password);
458 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
459 }
460 #endif
461 }
462
463 /* *var must be free-able */
464 static void var_override(const char **var, char *value)
465 {
466 if (value) {
467 free((void *)*var);
468 *var = xstrdup(value);
469 }
470 }
471
472 static void set_proxyauth_name_password(CURL *result)
473 {
474 #if LIBCURL_VERSION_NUM >= 0x071301
475 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
476 proxy_auth.username);
477 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
478 proxy_auth.password);
479 #else
480 struct strbuf s = STRBUF_INIT;
481
482 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
483 strbuf_addch(&s, ':');
484 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
485 curl_proxyuserpwd = strbuf_detach(&s, NULL);
486 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
487 #endif
488 }
489
490 static void init_curl_proxy_auth(CURL *result)
491 {
492 if (proxy_auth.username) {
493 if (!proxy_auth.password)
494 credential_fill(&proxy_auth);
495 set_proxyauth_name_password(result);
496 }
497
498 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
499
500 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
501 if (http_proxy_authmethod) {
502 int i;
503 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
504 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
505 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
506 proxy_authmethods[i].curlauth_param);
507 break;
508 }
509 }
510 if (i == ARRAY_SIZE(proxy_authmethods)) {
511 warning("unsupported proxy authentication method %s: using anyauth",
512 http_proxy_authmethod);
513 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
514 }
515 }
516 else
517 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
518 #endif
519 }
520
521 static int has_cert_password(void)
522 {
523 if (ssl_cert == NULL || ssl_cert_password_required != 1)
524 return 0;
525 if (!cert_auth.password) {
526 cert_auth.protocol = xstrdup("cert");
527 cert_auth.username = xstrdup("");
528 cert_auth.path = xstrdup(ssl_cert);
529 credential_fill(&cert_auth);
530 }
531 return 1;
532 }
533
534 #if LIBCURL_VERSION_NUM >= 0x071900
535 static void set_curl_keepalive(CURL *c)
536 {
537 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
538 }
539
540 #elif LIBCURL_VERSION_NUM >= 0x071000
541 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
542 {
543 int ka = 1;
544 int rc;
545 socklen_t len = (socklen_t)sizeof(ka);
546
547 if (type != CURLSOCKTYPE_IPCXN)
548 return 0;
549
550 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
551 if (rc < 0)
552 warning_errno("unable to set SO_KEEPALIVE on socket");
553
554 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
555 }
556
557 static void set_curl_keepalive(CURL *c)
558 {
559 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
560 }
561
562 #else
563 static void set_curl_keepalive(CURL *c)
564 {
565 /* not supported on older curl versions */
566 }
567 #endif
568
569 static void redact_sensitive_header(struct strbuf *header)
570 {
571 const char *sensitive_header;
572
573 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
574 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
575 /* The first token is the type, which is OK to log */
576 while (isspace(*sensitive_header))
577 sensitive_header++;
578 while (*sensitive_header && !isspace(*sensitive_header))
579 sensitive_header++;
580 /* Everything else is opaque and possibly sensitive */
581 strbuf_setlen(header, sensitive_header - header->buf);
582 strbuf_addstr(header, " <redacted>");
583 } else if (cookies_to_redact.nr &&
584 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
585 struct strbuf redacted_header = STRBUF_INIT;
586 char *cookie;
587
588 while (isspace(*sensitive_header))
589 sensitive_header++;
590
591 /*
592 * The contents of header starting from sensitive_header will
593 * subsequently be overridden, so it is fine to mutate this
594 * string (hence the assignment to "char *").
595 */
596 cookie = (char *) sensitive_header;
597
598 while (cookie) {
599 char *equals;
600 char *semicolon = strstr(cookie, "; ");
601 if (semicolon)
602 *semicolon = 0;
603 equals = strchrnul(cookie, '=');
604 if (!equals) {
605 /* invalid cookie, just append and continue */
606 strbuf_addstr(&redacted_header, cookie);
607 continue;
608 }
609 *equals = 0; /* temporarily set to NUL for lookup */
610 if (string_list_lookup(&cookies_to_redact, cookie)) {
611 strbuf_addstr(&redacted_header, cookie);
612 strbuf_addstr(&redacted_header, "=<redacted>");
613 } else {
614 *equals = '=';
615 strbuf_addstr(&redacted_header, cookie);
616 }
617 if (semicolon) {
618 /*
619 * There are more cookies. (Or, for some
620 * reason, the input string ends in "; ".)
621 */
622 strbuf_addstr(&redacted_header, "; ");
623 cookie = semicolon + strlen("; ");
624 } else {
625 cookie = NULL;
626 }
627 }
628
629 strbuf_setlen(header, sensitive_header - header->buf);
630 strbuf_addbuf(header, &redacted_header);
631 }
632 }
633
634 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
635 {
636 struct strbuf out = STRBUF_INIT;
637 struct strbuf **headers, **header;
638
639 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
640 text, (long)size, (long)size);
641 trace_strbuf(&trace_curl, &out);
642 strbuf_reset(&out);
643 strbuf_add(&out, ptr, size);
644 headers = strbuf_split_max(&out, '\n', 0);
645
646 for (header = headers; *header; header++) {
647 if (hide_sensitive_header)
648 redact_sensitive_header(*header);
649 strbuf_insert((*header), 0, text, strlen(text));
650 strbuf_insert((*header), strlen(text), ": ", 2);
651 strbuf_rtrim((*header));
652 strbuf_addch((*header), '\n');
653 trace_strbuf(&trace_curl, (*header));
654 }
655 strbuf_list_free(headers);
656 strbuf_release(&out);
657 }
658
659 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
660 {
661 size_t i;
662 struct strbuf out = STRBUF_INIT;
663 unsigned int width = 60;
664
665 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
666 text, (long)size, (long)size);
667 trace_strbuf(&trace_curl, &out);
668
669 for (i = 0; i < size; i += width) {
670 size_t w;
671
672 strbuf_reset(&out);
673 strbuf_addf(&out, "%s: ", text);
674 for (w = 0; (w < width) && (i + w < size); w++) {
675 unsigned char ch = ptr[i + w];
676
677 strbuf_addch(&out,
678 (ch >= 0x20) && (ch < 0x80)
679 ? ch : '.');
680 }
681 strbuf_addch(&out, '\n');
682 trace_strbuf(&trace_curl, &out);
683 }
684 strbuf_release(&out);
685 }
686
687 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
688 {
689 const char *text;
690 enum { NO_FILTER = 0, DO_FILTER = 1 };
691
692 switch (type) {
693 case CURLINFO_TEXT:
694 trace_printf_key(&trace_curl, "== Info: %s", data);
695 break;
696 case CURLINFO_HEADER_OUT:
697 text = "=> Send header";
698 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
699 break;
700 case CURLINFO_DATA_OUT:
701 if (trace_curl_data) {
702 text = "=> Send data";
703 curl_dump_data(text, (unsigned char *)data, size);
704 }
705 break;
706 case CURLINFO_SSL_DATA_OUT:
707 if (trace_curl_data) {
708 text = "=> Send SSL data";
709 curl_dump_data(text, (unsigned char *)data, size);
710 }
711 break;
712 case CURLINFO_HEADER_IN:
713 text = "<= Recv header";
714 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
715 break;
716 case CURLINFO_DATA_IN:
717 if (trace_curl_data) {
718 text = "<= Recv data";
719 curl_dump_data(text, (unsigned char *)data, size);
720 }
721 break;
722 case CURLINFO_SSL_DATA_IN:
723 if (trace_curl_data) {
724 text = "<= Recv SSL data";
725 curl_dump_data(text, (unsigned char *)data, size);
726 }
727 break;
728
729 default: /* we ignore unknown types by default */
730 return 0;
731 }
732 return 0;
733 }
734
735 void setup_curl_trace(CURL *handle)
736 {
737 if (!trace_want(&trace_curl))
738 return;
739 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
740 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
741 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
742 }
743
744 #ifdef CURLPROTO_HTTP
745 static long get_curl_allowed_protocols(int from_user)
746 {
747 long allowed_protocols = 0;
748
749 if (is_transport_allowed("http", from_user))
750 allowed_protocols |= CURLPROTO_HTTP;
751 if (is_transport_allowed("https", from_user))
752 allowed_protocols |= CURLPROTO_HTTPS;
753 if (is_transport_allowed("ftp", from_user))
754 allowed_protocols |= CURLPROTO_FTP;
755 if (is_transport_allowed("ftps", from_user))
756 allowed_protocols |= CURLPROTO_FTPS;
757
758 return allowed_protocols;
759 }
760 #endif
761
762 static CURL *get_curl_handle(void)
763 {
764 CURL *result = curl_easy_init();
765
766 if (!result)
767 die("curl_easy_init failed");
768
769 if (!curl_ssl_verify) {
770 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
771 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
772 } else {
773 /* Verify authenticity of the peer's certificate */
774 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
775 /* The name in the cert must match whom we tried to connect */
776 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
777 }
778
779 #if LIBCURL_VERSION_NUM >= 0x070907
780 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
781 #endif
782 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
783 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
784 #endif
785
786 #ifdef CURLGSSAPI_DELEGATION_FLAG
787 if (curl_deleg) {
788 int i;
789 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
790 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
791 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
792 curl_deleg_levels[i].curl_deleg_param);
793 break;
794 }
795 }
796 if (i == ARRAY_SIZE(curl_deleg_levels))
797 warning("Unknown delegation method '%s': using default",
798 curl_deleg);
799 }
800 #endif
801
802 if (http_proactive_auth)
803 init_curl_http_auth(result);
804
805 if (getenv("GIT_SSL_VERSION"))
806 ssl_version = getenv("GIT_SSL_VERSION");
807 if (ssl_version && *ssl_version) {
808 int i;
809 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
810 if (!strcmp(ssl_version, sslversions[i].name)) {
811 curl_easy_setopt(result, CURLOPT_SSLVERSION,
812 sslversions[i].ssl_version);
813 break;
814 }
815 }
816 if (i == ARRAY_SIZE(sslversions))
817 warning("unsupported ssl version %s: using default",
818 ssl_version);
819 }
820
821 if (getenv("GIT_SSL_CIPHER_LIST"))
822 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
823 if (ssl_cipherlist != NULL && *ssl_cipherlist)
824 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
825 ssl_cipherlist);
826
827 if (ssl_cert != NULL)
828 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
829 if (has_cert_password())
830 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
831 #if LIBCURL_VERSION_NUM >= 0x070903
832 if (ssl_key != NULL)
833 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
834 #endif
835 #if LIBCURL_VERSION_NUM >= 0x070908
836 if (ssl_capath != NULL)
837 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
838 #endif
839 #if LIBCURL_VERSION_NUM >= 0x072c00
840 if (ssl_pinnedkey != NULL)
841 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
842 #endif
843 if (ssl_cainfo != NULL)
844 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
845
846 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
847 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
848 curl_low_speed_limit);
849 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
850 curl_low_speed_time);
851 }
852
853 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
854 #if LIBCURL_VERSION_NUM >= 0x071301
855 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
856 #elif LIBCURL_VERSION_NUM >= 0x071101
857 curl_easy_setopt(result, CURLOPT_POST301, 1);
858 #endif
859 #ifdef CURLPROTO_HTTP
860 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
861 get_curl_allowed_protocols(0));
862 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
863 get_curl_allowed_protocols(-1));
864 #else
865 warning("protocol restrictions not applied to curl redirects because\n"
866 "your curl version is too old (>= 7.19.4)");
867 #endif
868 if (getenv("GIT_CURL_VERBOSE"))
869 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
870 setup_curl_trace(result);
871 if (getenv("GIT_TRACE_CURL_NO_DATA"))
872 trace_curl_data = 0;
873 if (getenv("GIT_REDACT_COOKIES")) {
874 string_list_split(&cookies_to_redact,
875 getenv("GIT_REDACT_COOKIES"), ',', -1);
876 string_list_sort(&cookies_to_redact);
877 }
878
879 curl_easy_setopt(result, CURLOPT_USERAGENT,
880 user_agent ? user_agent : git_user_agent());
881
882 if (curl_ftp_no_epsv)
883 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
884
885 #ifdef CURLOPT_USE_SSL
886 if (curl_ssl_try)
887 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
888 #endif
889
890 /*
891 * CURL also examines these variables as a fallback; but we need to query
892 * them here in order to decide whether to prompt for missing password (cf.
893 * init_curl_proxy_auth()).
894 *
895 * Unlike many other common environment variables, these are historically
896 * lowercase only. It appears that CURL did not know this and implemented
897 * only uppercase variants, which was later corrected to take both - with
898 * the exception of http_proxy, which is lowercase only also in CURL. As
899 * the lowercase versions are the historical quasi-standard, they take
900 * precedence here, as in CURL.
901 */
902 if (!curl_http_proxy) {
903 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
904 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
905 var_override(&curl_http_proxy, getenv("https_proxy"));
906 } else {
907 var_override(&curl_http_proxy, getenv("http_proxy"));
908 }
909 if (!curl_http_proxy) {
910 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
911 var_override(&curl_http_proxy, getenv("all_proxy"));
912 }
913 }
914
915 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
916 /*
917 * Handle case with the empty http.proxy value here to keep
918 * common code clean.
919 * NB: empty option disables proxying at all.
920 */
921 curl_easy_setopt(result, CURLOPT_PROXY, "");
922 } else if (curl_http_proxy) {
923 #if LIBCURL_VERSION_NUM >= 0x071800
924 if (starts_with(curl_http_proxy, "socks5h"))
925 curl_easy_setopt(result,
926 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
927 else if (starts_with(curl_http_proxy, "socks5"))
928 curl_easy_setopt(result,
929 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
930 else if (starts_with(curl_http_proxy, "socks4a"))
931 curl_easy_setopt(result,
932 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
933 else if (starts_with(curl_http_proxy, "socks"))
934 curl_easy_setopt(result,
935 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
936 #endif
937 #if LIBCURL_VERSION_NUM >= 0x073400
938 else if (starts_with(curl_http_proxy, "https"))
939 curl_easy_setopt(result,
940 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
941 #endif
942 if (strstr(curl_http_proxy, "://"))
943 credential_from_url(&proxy_auth, curl_http_proxy);
944 else {
945 struct strbuf url = STRBUF_INIT;
946 strbuf_addf(&url, "http://%s", curl_http_proxy);
947 credential_from_url(&proxy_auth, url.buf);
948 strbuf_release(&url);
949 }
950
951 if (!proxy_auth.host)
952 die("Invalid proxy URL '%s'", curl_http_proxy);
953
954 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
955 #if LIBCURL_VERSION_NUM >= 0x071304
956 var_override(&curl_no_proxy, getenv("NO_PROXY"));
957 var_override(&curl_no_proxy, getenv("no_proxy"));
958 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
959 #endif
960 }
961 init_curl_proxy_auth(result);
962
963 set_curl_keepalive(result);
964
965 return result;
966 }
967
968 static void set_from_env(const char **var, const char *envname)
969 {
970 const char *val = getenv(envname);
971 if (val)
972 *var = val;
973 }
974
975 static void protocol_http_header(void)
976 {
977 if (get_protocol_version_config() > 0) {
978 struct strbuf protocol_header = STRBUF_INIT;
979
980 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
981 get_protocol_version_config());
982
983
984 extra_http_headers = curl_slist_append(extra_http_headers,
985 protocol_header.buf);
986 strbuf_release(&protocol_header);
987 }
988 }
989
990 void http_init(struct remote *remote, const char *url, int proactive_auth)
991 {
992 char *low_speed_limit;
993 char *low_speed_time;
994 char *normalized_url;
995 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
996
997 config.section = "http";
998 config.key = NULL;
999 config.collect_fn = http_options;
1000 config.cascade_fn = git_default_config;
1001 config.cb = NULL;
1002
1003 http_is_verbose = 0;
1004 normalized_url = url_normalize(url, &config.url);
1005
1006 git_config(urlmatch_config_entry, &config);
1007 free(normalized_url);
1008
1009 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1010 die("curl_global_init failed");
1011
1012 http_proactive_auth = proactive_auth;
1013
1014 if (remote && remote->http_proxy)
1015 curl_http_proxy = xstrdup(remote->http_proxy);
1016
1017 if (remote)
1018 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1019
1020 protocol_http_header();
1021
1022 pragma_header = curl_slist_append(http_copy_default_headers(),
1023 "Pragma: no-cache");
1024 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1025 "Pragma:");
1026
1027 #ifdef USE_CURL_MULTI
1028 {
1029 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1030 if (http_max_requests != NULL)
1031 max_requests = atoi(http_max_requests);
1032 }
1033
1034 curlm = curl_multi_init();
1035 if (!curlm)
1036 die("curl_multi_init failed");
1037 #endif
1038
1039 if (getenv("GIT_SSL_NO_VERIFY"))
1040 curl_ssl_verify = 0;
1041
1042 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1043 #if LIBCURL_VERSION_NUM >= 0x070903
1044 set_from_env(&ssl_key, "GIT_SSL_KEY");
1045 #endif
1046 #if LIBCURL_VERSION_NUM >= 0x070908
1047 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1048 #endif
1049 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1050
1051 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1052
1053 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1054 if (low_speed_limit != NULL)
1055 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1056 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1057 if (low_speed_time != NULL)
1058 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1059
1060 if (curl_ssl_verify == -1)
1061 curl_ssl_verify = 1;
1062
1063 curl_session_count = 0;
1064 #ifdef USE_CURL_MULTI
1065 if (max_requests < 1)
1066 max_requests = DEFAULT_MAX_REQUESTS;
1067 #endif
1068
1069 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1070 curl_ftp_no_epsv = 1;
1071
1072 if (url) {
1073 credential_from_url(&http_auth, url);
1074 if (!ssl_cert_password_required &&
1075 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1076 starts_with(url, "https://"))
1077 ssl_cert_password_required = 1;
1078 }
1079
1080 #ifndef NO_CURL_EASY_DUPHANDLE
1081 curl_default = get_curl_handle();
1082 #endif
1083 }
1084
1085 void http_cleanup(void)
1086 {
1087 struct active_request_slot *slot = active_queue_head;
1088
1089 while (slot != NULL) {
1090 struct active_request_slot *next = slot->next;
1091 if (slot->curl != NULL) {
1092 xmulti_remove_handle(slot);
1093 curl_easy_cleanup(slot->curl);
1094 }
1095 free(slot);
1096 slot = next;
1097 }
1098 active_queue_head = NULL;
1099
1100 #ifndef NO_CURL_EASY_DUPHANDLE
1101 curl_easy_cleanup(curl_default);
1102 #endif
1103
1104 #ifdef USE_CURL_MULTI
1105 curl_multi_cleanup(curlm);
1106 #endif
1107 curl_global_cleanup();
1108
1109 curl_slist_free_all(extra_http_headers);
1110 extra_http_headers = NULL;
1111
1112 curl_slist_free_all(pragma_header);
1113 pragma_header = NULL;
1114
1115 curl_slist_free_all(no_pragma_header);
1116 no_pragma_header = NULL;
1117
1118 if (curl_http_proxy) {
1119 free((void *)curl_http_proxy);
1120 curl_http_proxy = NULL;
1121 }
1122
1123 if (proxy_auth.password) {
1124 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1125 FREE_AND_NULL(proxy_auth.password);
1126 }
1127
1128 free((void *)curl_proxyuserpwd);
1129 curl_proxyuserpwd = NULL;
1130
1131 free((void *)http_proxy_authmethod);
1132 http_proxy_authmethod = NULL;
1133
1134 if (cert_auth.password != NULL) {
1135 memset(cert_auth.password, 0, strlen(cert_auth.password));
1136 FREE_AND_NULL(cert_auth.password);
1137 }
1138 ssl_cert_password_required = 0;
1139
1140 FREE_AND_NULL(cached_accept_language);
1141 }
1142
1143 struct active_request_slot *get_active_slot(void)
1144 {
1145 struct active_request_slot *slot = active_queue_head;
1146 struct active_request_slot *newslot;
1147
1148 #ifdef USE_CURL_MULTI
1149 int num_transfers;
1150
1151 /* Wait for a slot to open up if the queue is full */
1152 while (active_requests >= max_requests) {
1153 curl_multi_perform(curlm, &num_transfers);
1154 if (num_transfers < active_requests)
1155 process_curl_messages();
1156 }
1157 #endif
1158
1159 while (slot != NULL && slot->in_use)
1160 slot = slot->next;
1161
1162 if (slot == NULL) {
1163 newslot = xmalloc(sizeof(*newslot));
1164 newslot->curl = NULL;
1165 newslot->in_use = 0;
1166 newslot->next = NULL;
1167
1168 slot = active_queue_head;
1169 if (slot == NULL) {
1170 active_queue_head = newslot;
1171 } else {
1172 while (slot->next != NULL)
1173 slot = slot->next;
1174 slot->next = newslot;
1175 }
1176 slot = newslot;
1177 }
1178
1179 if (slot->curl == NULL) {
1180 #ifdef NO_CURL_EASY_DUPHANDLE
1181 slot->curl = get_curl_handle();
1182 #else
1183 slot->curl = curl_easy_duphandle(curl_default);
1184 #endif
1185 curl_session_count++;
1186 }
1187
1188 active_requests++;
1189 slot->in_use = 1;
1190 slot->results = NULL;
1191 slot->finished = NULL;
1192 slot->callback_data = NULL;
1193 slot->callback_func = NULL;
1194 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1195 if (curl_save_cookies)
1196 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1197 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1198 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1199 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1200 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1201 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1202 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1203 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1204 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1205 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1206 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1207
1208 /*
1209 * Default following to off unless "ALWAYS" is configured; this gives
1210 * callers a sane starting point, and they can tweak for individual
1211 * HTTP_FOLLOW_* cases themselves.
1212 */
1213 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1214 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1215 else
1216 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1217
1218 #if LIBCURL_VERSION_NUM >= 0x070a08
1219 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1220 #endif
1221 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1222 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1223 #endif
1224 if (http_auth.password || curl_empty_auth_enabled())
1225 init_curl_http_auth(slot->curl);
1226
1227 return slot;
1228 }
1229
1230 int start_active_slot(struct active_request_slot *slot)
1231 {
1232 #ifdef USE_CURL_MULTI
1233 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1234 int num_transfers;
1235
1236 if (curlm_result != CURLM_OK &&
1237 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1238 warning("curl_multi_add_handle failed: %s",
1239 curl_multi_strerror(curlm_result));
1240 active_requests--;
1241 slot->in_use = 0;
1242 return 0;
1243 }
1244
1245 /*
1246 * We know there must be something to do, since we just added
1247 * something.
1248 */
1249 curl_multi_perform(curlm, &num_transfers);
1250 #endif
1251 return 1;
1252 }
1253
1254 #ifdef USE_CURL_MULTI
1255 struct fill_chain {
1256 void *data;
1257 int (*fill)(void *);
1258 struct fill_chain *next;
1259 };
1260
1261 static struct fill_chain *fill_cfg;
1262
1263 void add_fill_function(void *data, int (*fill)(void *))
1264 {
1265 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1266 struct fill_chain **linkp = &fill_cfg;
1267 new_fill->data = data;
1268 new_fill->fill = fill;
1269 new_fill->next = NULL;
1270 while (*linkp)
1271 linkp = &(*linkp)->next;
1272 *linkp = new_fill;
1273 }
1274
1275 void fill_active_slots(void)
1276 {
1277 struct active_request_slot *slot = active_queue_head;
1278
1279 while (active_requests < max_requests) {
1280 struct fill_chain *fill;
1281 for (fill = fill_cfg; fill; fill = fill->next)
1282 if (fill->fill(fill->data))
1283 break;
1284
1285 if (!fill)
1286 break;
1287 }
1288
1289 while (slot != NULL) {
1290 if (!slot->in_use && slot->curl != NULL
1291 && curl_session_count > min_curl_sessions) {
1292 curl_easy_cleanup(slot->curl);
1293 slot->curl = NULL;
1294 curl_session_count--;
1295 }
1296 slot = slot->next;
1297 }
1298 }
1299
1300 void step_active_slots(void)
1301 {
1302 int num_transfers;
1303 CURLMcode curlm_result;
1304
1305 do {
1306 curlm_result = curl_multi_perform(curlm, &num_transfers);
1307 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1308 if (num_transfers < active_requests) {
1309 process_curl_messages();
1310 fill_active_slots();
1311 }
1312 }
1313 #endif
1314
1315 void run_active_slot(struct active_request_slot *slot)
1316 {
1317 #ifdef USE_CURL_MULTI
1318 fd_set readfds;
1319 fd_set writefds;
1320 fd_set excfds;
1321 int max_fd;
1322 struct timeval select_timeout;
1323 int finished = 0;
1324
1325 slot->finished = &finished;
1326 while (!finished) {
1327 step_active_slots();
1328
1329 if (slot->in_use) {
1330 #if LIBCURL_VERSION_NUM >= 0x070f04
1331 long curl_timeout;
1332 curl_multi_timeout(curlm, &curl_timeout);
1333 if (curl_timeout == 0) {
1334 continue;
1335 } else if (curl_timeout == -1) {
1336 select_timeout.tv_sec = 0;
1337 select_timeout.tv_usec = 50000;
1338 } else {
1339 select_timeout.tv_sec = curl_timeout / 1000;
1340 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1341 }
1342 #else
1343 select_timeout.tv_sec = 0;
1344 select_timeout.tv_usec = 50000;
1345 #endif
1346
1347 max_fd = -1;
1348 FD_ZERO(&readfds);
1349 FD_ZERO(&writefds);
1350 FD_ZERO(&excfds);
1351 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1352
1353 /*
1354 * It can happen that curl_multi_timeout returns a pathologically
1355 * long timeout when curl_multi_fdset returns no file descriptors
1356 * to read. See commit message for more details.
1357 */
1358 if (max_fd < 0 &&
1359 (select_timeout.tv_sec > 0 ||
1360 select_timeout.tv_usec > 50000)) {
1361 select_timeout.tv_sec = 0;
1362 select_timeout.tv_usec = 50000;
1363 }
1364
1365 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1366 }
1367 }
1368 #else
1369 while (slot->in_use) {
1370 slot->curl_result = curl_easy_perform(slot->curl);
1371 finish_active_slot(slot);
1372 }
1373 #endif
1374 }
1375
1376 static void release_active_slot(struct active_request_slot *slot)
1377 {
1378 closedown_active_slot(slot);
1379 if (slot->curl) {
1380 xmulti_remove_handle(slot);
1381 if (curl_session_count > min_curl_sessions) {
1382 curl_easy_cleanup(slot->curl);
1383 slot->curl = NULL;
1384 curl_session_count--;
1385 }
1386 }
1387 #ifdef USE_CURL_MULTI
1388 fill_active_slots();
1389 #endif
1390 }
1391
1392 void finish_all_active_slots(void)
1393 {
1394 struct active_request_slot *slot = active_queue_head;
1395
1396 while (slot != NULL)
1397 if (slot->in_use) {
1398 run_active_slot(slot);
1399 slot = active_queue_head;
1400 } else {
1401 slot = slot->next;
1402 }
1403 }
1404
1405 /* Helpers for modifying and creating URLs */
1406 static inline int needs_quote(int ch)
1407 {
1408 if (((ch >= 'A') && (ch <= 'Z'))
1409 || ((ch >= 'a') && (ch <= 'z'))
1410 || ((ch >= '0') && (ch <= '9'))
1411 || (ch == '/')
1412 || (ch == '-')
1413 || (ch == '.'))
1414 return 0;
1415 return 1;
1416 }
1417
1418 static char *quote_ref_url(const char *base, const char *ref)
1419 {
1420 struct strbuf buf = STRBUF_INIT;
1421 const char *cp;
1422 int ch;
1423
1424 end_url_with_slash(&buf, base);
1425
1426 for (cp = ref; (ch = *cp) != 0; cp++)
1427 if (needs_quote(ch))
1428 strbuf_addf(&buf, "%%%02x", ch);
1429 else
1430 strbuf_addch(&buf, *cp);
1431
1432 return strbuf_detach(&buf, NULL);
1433 }
1434
1435 void append_remote_object_url(struct strbuf *buf, const char *url,
1436 const char *hex,
1437 int only_two_digit_prefix)
1438 {
1439 end_url_with_slash(buf, url);
1440
1441 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1442 if (!only_two_digit_prefix)
1443 strbuf_addstr(buf, hex + 2);
1444 }
1445
1446 char *get_remote_object_url(const char *url, const char *hex,
1447 int only_two_digit_prefix)
1448 {
1449 struct strbuf buf = STRBUF_INIT;
1450 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1451 return strbuf_detach(&buf, NULL);
1452 }
1453
1454 static int handle_curl_result(struct slot_results *results)
1455 {
1456 /*
1457 * If we see a failing http code with CURLE_OK, we have turned off
1458 * FAILONERROR (to keep the server's custom error response), and should
1459 * translate the code into failure here.
1460 *
1461 * Likewise, if we see a redirect (30x code), that means we turned off
1462 * redirect-following, and we should treat the result as an error.
1463 */
1464 if (results->curl_result == CURLE_OK &&
1465 results->http_code >= 300) {
1466 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1467 /*
1468 * Normally curl will already have put the "reason phrase"
1469 * from the server into curl_errorstr; unfortunately without
1470 * FAILONERROR it is lost, so we can give only the numeric
1471 * status code.
1472 */
1473 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1474 "The requested URL returned error: %ld",
1475 results->http_code);
1476 }
1477
1478 if (results->curl_result == CURLE_OK) {
1479 credential_approve(&http_auth);
1480 if (proxy_auth.password)
1481 credential_approve(&proxy_auth);
1482 return HTTP_OK;
1483 } else if (missing_target(results))
1484 return HTTP_MISSING_TARGET;
1485 else if (results->http_code == 401) {
1486 if (http_auth.username && http_auth.password) {
1487 credential_reject(&http_auth);
1488 return HTTP_NOAUTH;
1489 } else {
1490 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1491 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1492 if (results->auth_avail) {
1493 http_auth_methods &= results->auth_avail;
1494 http_auth_methods_restricted = 1;
1495 }
1496 #endif
1497 return HTTP_REAUTH;
1498 }
1499 } else {
1500 if (results->http_connectcode == 407)
1501 credential_reject(&proxy_auth);
1502 #if LIBCURL_VERSION_NUM >= 0x070c00
1503 if (!curl_errorstr[0])
1504 strlcpy(curl_errorstr,
1505 curl_easy_strerror(results->curl_result),
1506 sizeof(curl_errorstr));
1507 #endif
1508 return HTTP_ERROR;
1509 }
1510 }
1511
1512 int run_one_slot(struct active_request_slot *slot,
1513 struct slot_results *results)
1514 {
1515 slot->results = results;
1516 if (!start_active_slot(slot)) {
1517 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1518 "failed to start HTTP request");
1519 return HTTP_START_FAILED;
1520 }
1521
1522 run_active_slot(slot);
1523 return handle_curl_result(results);
1524 }
1525
1526 struct curl_slist *http_copy_default_headers(void)
1527 {
1528 struct curl_slist *headers = NULL, *h;
1529
1530 for (h = extra_http_headers; h; h = h->next)
1531 headers = curl_slist_append(headers, h->data);
1532
1533 return headers;
1534 }
1535
1536 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1537 {
1538 char *ptr;
1539 CURLcode ret;
1540
1541 strbuf_reset(buf);
1542 ret = curl_easy_getinfo(curl, info, &ptr);
1543 if (!ret && ptr)
1544 strbuf_addstr(buf, ptr);
1545 return ret;
1546 }
1547
1548 /*
1549 * Check for and extract a content-type parameter. "raw"
1550 * should be positioned at the start of the potential
1551 * parameter, with any whitespace already removed.
1552 *
1553 * "name" is the name of the parameter. The value is appended
1554 * to "out".
1555 */
1556 static int extract_param(const char *raw, const char *name,
1557 struct strbuf *out)
1558 {
1559 size_t len = strlen(name);
1560
1561 if (strncasecmp(raw, name, len))
1562 return -1;
1563 raw += len;
1564
1565 if (*raw != '=')
1566 return -1;
1567 raw++;
1568
1569 while (*raw && !isspace(*raw) && *raw != ';')
1570 strbuf_addch(out, *raw++);
1571 return 0;
1572 }
1573
1574 /*
1575 * Extract a normalized version of the content type, with any
1576 * spaces suppressed, all letters lowercased, and no trailing ";"
1577 * or parameters.
1578 *
1579 * Note that we will silently remove even invalid whitespace. For
1580 * example, "text / plain" is specifically forbidden by RFC 2616,
1581 * but "text/plain" is the only reasonable output, and this keeps
1582 * our code simple.
1583 *
1584 * If the "charset" argument is not NULL, store the value of any
1585 * charset parameter there.
1586 *
1587 * Example:
1588 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1589 * "text / plain" -> "text/plain"
1590 */
1591 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1592 struct strbuf *charset)
1593 {
1594 const char *p;
1595
1596 strbuf_reset(type);
1597 strbuf_grow(type, raw->len);
1598 for (p = raw->buf; *p; p++) {
1599 if (isspace(*p))
1600 continue;
1601 if (*p == ';') {
1602 p++;
1603 break;
1604 }
1605 strbuf_addch(type, tolower(*p));
1606 }
1607
1608 if (!charset)
1609 return;
1610
1611 strbuf_reset(charset);
1612 while (*p) {
1613 while (isspace(*p) || *p == ';')
1614 p++;
1615 if (!extract_param(p, "charset", charset))
1616 return;
1617 while (*p && !isspace(*p))
1618 p++;
1619 }
1620
1621 if (!charset->len && starts_with(type->buf, "text/"))
1622 strbuf_addstr(charset, "ISO-8859-1");
1623 }
1624
1625 static void write_accept_language(struct strbuf *buf)
1626 {
1627 /*
1628 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1629 * that, q-value will be smaller than 0.001, the minimum q-value the
1630 * HTTP specification allows. See
1631 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1632 */
1633 const int MAX_DECIMAL_PLACES = 3;
1634 const int MAX_LANGUAGE_TAGS = 1000;
1635 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1636 char **language_tags = NULL;
1637 int num_langs = 0;
1638 const char *s = get_preferred_languages();
1639 int i;
1640 struct strbuf tag = STRBUF_INIT;
1641
1642 /* Don't add Accept-Language header if no language is preferred. */
1643 if (!s)
1644 return;
1645
1646 /*
1647 * Split the colon-separated string of preferred languages into
1648 * language_tags array.
1649 */
1650 do {
1651 /* collect language tag */
1652 for (; *s && (isalnum(*s) || *s == '_'); s++)
1653 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1654
1655 /* skip .codeset, @modifier and any other unnecessary parts */
1656 while (*s && *s != ':')
1657 s++;
1658
1659 if (tag.len) {
1660 num_langs++;
1661 REALLOC_ARRAY(language_tags, num_langs);
1662 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1663 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1664 break;
1665 }
1666 } while (*s++);
1667
1668 /* write Accept-Language header into buf */
1669 if (num_langs) {
1670 int last_buf_len = 0;
1671 int max_q;
1672 int decimal_places;
1673 char q_format[32];
1674
1675 /* add '*' */
1676 REALLOC_ARRAY(language_tags, num_langs + 1);
1677 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1678
1679 /* compute decimal_places */
1680 for (max_q = 1, decimal_places = 0;
1681 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1682 decimal_places++, max_q *= 10)
1683 ;
1684
1685 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1686
1687 strbuf_addstr(buf, "Accept-Language: ");
1688
1689 for (i = 0; i < num_langs; i++) {
1690 if (i > 0)
1691 strbuf_addstr(buf, ", ");
1692
1693 strbuf_addstr(buf, language_tags[i]);
1694
1695 if (i > 0)
1696 strbuf_addf(buf, q_format, max_q - i);
1697
1698 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1699 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1700 break;
1701 }
1702
1703 last_buf_len = buf->len;
1704 }
1705 }
1706
1707 /* free language tags -- last one is a static '*' */
1708 for (i = 0; i < num_langs - 1; i++)
1709 free(language_tags[i]);
1710 free(language_tags);
1711 }
1712
1713 /*
1714 * Get an Accept-Language header which indicates user's preferred languages.
1715 *
1716 * Examples:
1717 * LANGUAGE= -> ""
1718 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1719 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1720 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1721 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1722 * LANGUAGE= LANG=C -> ""
1723 */
1724 static const char *get_accept_language(void)
1725 {
1726 if (!cached_accept_language) {
1727 struct strbuf buf = STRBUF_INIT;
1728 write_accept_language(&buf);
1729 if (buf.len > 0)
1730 cached_accept_language = strbuf_detach(&buf, NULL);
1731 }
1732
1733 return cached_accept_language;
1734 }
1735
1736 static void http_opt_request_remainder(CURL *curl, off_t pos)
1737 {
1738 char buf[128];
1739 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1740 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1741 }
1742
1743 /* http_request() targets */
1744 #define HTTP_REQUEST_STRBUF 0
1745 #define HTTP_REQUEST_FILE 1
1746
1747 static int http_request(const char *url,
1748 void *result, int target,
1749 const struct http_get_options *options)
1750 {
1751 struct active_request_slot *slot;
1752 struct slot_results results;
1753 struct curl_slist *headers = http_copy_default_headers();
1754 struct strbuf buf = STRBUF_INIT;
1755 const char *accept_language;
1756 int ret;
1757
1758 slot = get_active_slot();
1759 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1760
1761 if (result == NULL) {
1762 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1763 } else {
1764 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1765 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1766
1767 if (target == HTTP_REQUEST_FILE) {
1768 off_t posn = ftello(result);
1769 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1770 fwrite);
1771 if (posn > 0)
1772 http_opt_request_remainder(slot->curl, posn);
1773 } else
1774 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1775 fwrite_buffer);
1776 }
1777
1778 accept_language = get_accept_language();
1779
1780 if (accept_language)
1781 headers = curl_slist_append(headers, accept_language);
1782
1783 strbuf_addstr(&buf, "Pragma:");
1784 if (options && options->no_cache)
1785 strbuf_addstr(&buf, " no-cache");
1786 if (options && options->keep_error)
1787 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1788 if (options && options->initial_request &&
1789 http_follow_config == HTTP_FOLLOW_INITIAL)
1790 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1791
1792 headers = curl_slist_append(headers, buf.buf);
1793
1794 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1795 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1796 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1797
1798 ret = run_one_slot(slot, &results);
1799
1800 if (options && options->content_type) {
1801 struct strbuf raw = STRBUF_INIT;
1802 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1803 extract_content_type(&raw, options->content_type,
1804 options->charset);
1805 strbuf_release(&raw);
1806 }
1807
1808 if (options && options->effective_url)
1809 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1810 options->effective_url);
1811
1812 curl_slist_free_all(headers);
1813 strbuf_release(&buf);
1814
1815 return ret;
1816 }
1817
1818 /*
1819 * Update the "base" url to a more appropriate value, as deduced by
1820 * redirects seen when requesting a URL starting with "url".
1821 *
1822 * The "asked" parameter is a URL that we asked curl to access, and must begin
1823 * with "base".
1824 *
1825 * The "got" parameter is the URL that curl reported to us as where we ended
1826 * up.
1827 *
1828 * Returns 1 if we updated the base url, 0 otherwise.
1829 *
1830 * Our basic strategy is to compare "base" and "asked" to find the bits
1831 * specific to our request. We then strip those bits off of "got" to yield the
1832 * new base. So for example, if our base is "http://example.com/foo.git",
1833 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1834 * with "https://other.example.com/foo.git/info/refs". We would want the
1835 * new URL to become "https://other.example.com/foo.git".
1836 *
1837 * Note that this assumes a sane redirect scheme. It's entirely possible
1838 * in the example above to end up at a URL that does not even end in
1839 * "info/refs". In such a case we die. There's not much we can do, such a
1840 * scheme is unlikely to represent a real git repository, and failing to
1841 * rewrite the base opens options for malicious redirects to do funny things.
1842 */
1843 static int update_url_from_redirect(struct strbuf *base,
1844 const char *asked,
1845 const struct strbuf *got)
1846 {
1847 const char *tail;
1848 size_t new_len;
1849
1850 if (!strcmp(asked, got->buf))
1851 return 0;
1852
1853 if (!skip_prefix(asked, base->buf, &tail))
1854 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1855 asked, base->buf);
1856
1857 new_len = got->len;
1858 if (!strip_suffix_mem(got->buf, &new_len, tail))
1859 die(_("unable to update url base from redirection:\n"
1860 " asked for: %s\n"
1861 " redirect: %s"),
1862 asked, got->buf);
1863
1864 strbuf_reset(base);
1865 strbuf_add(base, got->buf, new_len);
1866
1867 return 1;
1868 }
1869
1870 static int http_request_reauth(const char *url,
1871 void *result, int target,
1872 struct http_get_options *options)
1873 {
1874 int ret = http_request(url, result, target, options);
1875
1876 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1877 return ret;
1878
1879 if (options && options->effective_url && options->base_url) {
1880 if (update_url_from_redirect(options->base_url,
1881 url, options->effective_url)) {
1882 credential_from_url(&http_auth, options->base_url->buf);
1883 url = options->effective_url->buf;
1884 }
1885 }
1886
1887 if (ret != HTTP_REAUTH)
1888 return ret;
1889
1890 /*
1891 * If we are using KEEP_ERROR, the previous request may have
1892 * put cruft into our output stream; we should clear it out before
1893 * making our next request. We only know how to do this for
1894 * the strbuf case, but that is enough to satisfy current callers.
1895 */
1896 if (options && options->keep_error) {
1897 switch (target) {
1898 case HTTP_REQUEST_STRBUF:
1899 strbuf_reset(result);
1900 break;
1901 default:
1902 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1903 }
1904 }
1905
1906 credential_fill(&http_auth);
1907
1908 return http_request(url, result, target, options);
1909 }
1910
1911 int http_get_strbuf(const char *url,
1912 struct strbuf *result,
1913 struct http_get_options *options)
1914 {
1915 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1916 }
1917
1918 /*
1919 * Downloads a URL and stores the result in the given file.
1920 *
1921 * If a previous interrupted download is detected (i.e. a previous temporary
1922 * file is still around) the download is resumed.
1923 */
1924 static int http_get_file(const char *url, const char *filename,
1925 struct http_get_options *options)
1926 {
1927 int ret;
1928 struct strbuf tmpfile = STRBUF_INIT;
1929 FILE *result;
1930
1931 strbuf_addf(&tmpfile, "%s.temp", filename);
1932 result = fopen(tmpfile.buf, "a");
1933 if (!result) {
1934 error("Unable to open local file %s", tmpfile.buf);
1935 ret = HTTP_ERROR;
1936 goto cleanup;
1937 }
1938
1939 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1940 fclose(result);
1941
1942 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1943 ret = HTTP_ERROR;
1944 cleanup:
1945 strbuf_release(&tmpfile);
1946 return ret;
1947 }
1948
1949 int http_fetch_ref(const char *base, struct ref *ref)
1950 {
1951 struct http_get_options options = {0};
1952 char *url;
1953 struct strbuf buffer = STRBUF_INIT;
1954 int ret = -1;
1955
1956 options.no_cache = 1;
1957
1958 url = quote_ref_url(base, ref->name);
1959 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1960 strbuf_rtrim(&buffer);
1961 if (buffer.len == 40)
1962 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1963 else if (starts_with(buffer.buf, "ref: ")) {
1964 ref->symref = xstrdup(buffer.buf + 5);
1965 ret = 0;
1966 }
1967 }
1968
1969 strbuf_release(&buffer);
1970 free(url);
1971 return ret;
1972 }
1973
1974 /* Helpers for fetching packs */
1975 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1976 {
1977 char *url, *tmp;
1978 struct strbuf buf = STRBUF_INIT;
1979
1980 if (http_is_verbose)
1981 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1982
1983 end_url_with_slash(&buf, base_url);
1984 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1985 url = strbuf_detach(&buf, NULL);
1986
1987 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1988 tmp = strbuf_detach(&buf, NULL);
1989
1990 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1991 error("Unable to get pack index %s", url);
1992 FREE_AND_NULL(tmp);
1993 }
1994
1995 free(url);
1996 return tmp;
1997 }
1998
1999 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2000 unsigned char *sha1, const char *base_url)
2001 {
2002 struct packed_git *new_pack;
2003 char *tmp_idx = NULL;
2004 int ret;
2005
2006 if (has_pack_index(sha1)) {
2007 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2008 if (!new_pack)
2009 return -1; /* parse_pack_index() already issued error message */
2010 goto add_pack;
2011 }
2012
2013 tmp_idx = fetch_pack_index(sha1, base_url);
2014 if (!tmp_idx)
2015 return -1;
2016
2017 new_pack = parse_pack_index(sha1, tmp_idx);
2018 if (!new_pack) {
2019 unlink(tmp_idx);
2020 free(tmp_idx);
2021
2022 return -1; /* parse_pack_index() already issued error message */
2023 }
2024
2025 ret = verify_pack_index(new_pack);
2026 if (!ret) {
2027 close_pack_index(new_pack);
2028 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2029 }
2030 free(tmp_idx);
2031 if (ret)
2032 return -1;
2033
2034 add_pack:
2035 new_pack->next = *packs_head;
2036 *packs_head = new_pack;
2037 return 0;
2038 }
2039
2040 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2041 {
2042 struct http_get_options options = {0};
2043 int ret = 0, i = 0;
2044 char *url, *data;
2045 struct strbuf buf = STRBUF_INIT;
2046 unsigned char sha1[20];
2047
2048 end_url_with_slash(&buf, base_url);
2049 strbuf_addstr(&buf, "objects/info/packs");
2050 url = strbuf_detach(&buf, NULL);
2051
2052 options.no_cache = 1;
2053 ret = http_get_strbuf(url, &buf, &options);
2054 if (ret != HTTP_OK)
2055 goto cleanup;
2056
2057 data = buf.buf;
2058 while (i < buf.len) {
2059 switch (data[i]) {
2060 case 'P':
2061 i++;
2062 if (i + 52 <= buf.len &&
2063 starts_with(data + i, " pack-") &&
2064 starts_with(data + i + 46, ".pack\n")) {
2065 get_sha1_hex(data + i + 6, sha1);
2066 fetch_and_setup_pack_index(packs_head, sha1,
2067 base_url);
2068 i += 51;
2069 break;
2070 }
2071 default:
2072 while (i < buf.len && data[i] != '\n')
2073 i++;
2074 }
2075 i++;
2076 }
2077
2078 cleanup:
2079 free(url);
2080 return ret;
2081 }
2082
2083 void release_http_pack_request(struct http_pack_request *preq)
2084 {
2085 if (preq->packfile != NULL) {
2086 fclose(preq->packfile);
2087 preq->packfile = NULL;
2088 }
2089 preq->slot = NULL;
2090 free(preq->url);
2091 free(preq);
2092 }
2093
2094 int finish_http_pack_request(struct http_pack_request *preq)
2095 {
2096 struct packed_git **lst;
2097 struct packed_git *p = preq->target;
2098 char *tmp_idx;
2099 size_t len;
2100 struct child_process ip = CHILD_PROCESS_INIT;
2101
2102 close_pack_index(p);
2103
2104 fclose(preq->packfile);
2105 preq->packfile = NULL;
2106
2107 lst = preq->lst;
2108 while (*lst != p)
2109 lst = &((*lst)->next);
2110 *lst = (*lst)->next;
2111
2112 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2113 die("BUG: pack tmpfile does not end in .pack.temp?");
2114 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2115
2116 argv_array_push(&ip.args, "index-pack");
2117 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2118 argv_array_push(&ip.args, preq->tmpfile);
2119 ip.git_cmd = 1;
2120 ip.no_stdin = 1;
2121 ip.no_stdout = 1;
2122
2123 if (run_command(&ip)) {
2124 unlink(preq->tmpfile);
2125 unlink(tmp_idx);
2126 free(tmp_idx);
2127 return -1;
2128 }
2129
2130 unlink(sha1_pack_index_name(p->sha1));
2131
2132 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2133 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2134 free(tmp_idx);
2135 return -1;
2136 }
2137
2138 install_packed_git(p);
2139 free(tmp_idx);
2140 return 0;
2141 }
2142
2143 struct http_pack_request *new_http_pack_request(
2144 struct packed_git *target, const char *base_url)
2145 {
2146 off_t prev_posn = 0;
2147 struct strbuf buf = STRBUF_INIT;
2148 struct http_pack_request *preq;
2149
2150 preq = xcalloc(1, sizeof(*preq));
2151 preq->target = target;
2152
2153 end_url_with_slash(&buf, base_url);
2154 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2155 sha1_to_hex(target->sha1));
2156 preq->url = strbuf_detach(&buf, NULL);
2157
2158 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2159 sha1_pack_name(target->sha1));
2160 preq->packfile = fopen(preq->tmpfile, "a");
2161 if (!preq->packfile) {
2162 error("Unable to open local file %s for pack",
2163 preq->tmpfile);
2164 goto abort;
2165 }
2166
2167 preq->slot = get_active_slot();
2168 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2169 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2170 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2171 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2172 no_pragma_header);
2173
2174 /*
2175 * If there is data present from a previous transfer attempt,
2176 * resume where it left off
2177 */
2178 prev_posn = ftello(preq->packfile);
2179 if (prev_posn>0) {
2180 if (http_is_verbose)
2181 fprintf(stderr,
2182 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2183 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2184 http_opt_request_remainder(preq->slot->curl, prev_posn);
2185 }
2186
2187 return preq;
2188
2189 abort:
2190 free(preq->url);
2191 free(preq);
2192 return NULL;
2193 }
2194
2195 /* Helpers for fetching objects (loose) */
2196 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2197 void *data)
2198 {
2199 unsigned char expn[4096];
2200 size_t size = eltsize * nmemb;
2201 int posn = 0;
2202 struct http_object_request *freq = data;
2203 struct active_request_slot *slot = freq->slot;
2204
2205 if (slot) {
2206 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2207 &slot->http_code);
2208 if (c != CURLE_OK)
2209 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2210 curl_easy_strerror(c));
2211 if (slot->http_code >= 300)
2212 return size;
2213 }
2214
2215 do {
2216 ssize_t retval = xwrite(freq->localfile,
2217 (char *) ptr + posn, size - posn);
2218 if (retval < 0)
2219 return posn;
2220 posn += retval;
2221 } while (posn < size);
2222
2223 freq->stream.avail_in = size;
2224 freq->stream.next_in = (void *)ptr;
2225 do {
2226 freq->stream.next_out = expn;
2227 freq->stream.avail_out = sizeof(expn);
2228 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2229 git_SHA1_Update(&freq->c, expn,
2230 sizeof(expn) - freq->stream.avail_out);
2231 } while (freq->stream.avail_in && freq->zret == Z_OK);
2232 return size;
2233 }
2234
2235 struct http_object_request *new_http_object_request(const char *base_url,
2236 unsigned char *sha1)
2237 {
2238 char *hex = sha1_to_hex(sha1);
2239 struct strbuf filename = STRBUF_INIT;
2240 char prevfile[PATH_MAX];
2241 int prevlocal;
2242 char prev_buf[PREV_BUF_SIZE];
2243 ssize_t prev_read = 0;
2244 off_t prev_posn = 0;
2245 struct http_object_request *freq;
2246
2247 freq = xcalloc(1, sizeof(*freq));
2248 hashcpy(freq->sha1, sha1);
2249 freq->localfile = -1;
2250
2251 sha1_file_name(&filename, sha1);
2252 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2253 "%s.temp", filename.buf);
2254
2255 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename.buf);
2256 unlink_or_warn(prevfile);
2257 rename(freq->tmpfile, prevfile);
2258 unlink_or_warn(freq->tmpfile);
2259 strbuf_release(&filename);
2260
2261 if (freq->localfile != -1)
2262 error("fd leakage in start: %d", freq->localfile);
2263 freq->localfile = open(freq->tmpfile,
2264 O_WRONLY | O_CREAT | O_EXCL, 0666);
2265 /*
2266 * This could have failed due to the "lazy directory creation";
2267 * try to mkdir the last path component.
2268 */
2269 if (freq->localfile < 0 && errno == ENOENT) {
2270 char *dir = strrchr(freq->tmpfile, '/');
2271 if (dir) {
2272 *dir = 0;
2273 mkdir(freq->tmpfile, 0777);
2274 *dir = '/';
2275 }
2276 freq->localfile = open(freq->tmpfile,
2277 O_WRONLY | O_CREAT | O_EXCL, 0666);
2278 }
2279
2280 if (freq->localfile < 0) {
2281 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2282 goto abort;
2283 }
2284
2285 git_inflate_init(&freq->stream);
2286
2287 git_SHA1_Init(&freq->c);
2288
2289 freq->url = get_remote_object_url(base_url, hex, 0);
2290
2291 /*
2292 * If a previous temp file is present, process what was already
2293 * fetched.
2294 */
2295 prevlocal = open(prevfile, O_RDONLY);
2296 if (prevlocal != -1) {
2297 do {
2298 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2299 if (prev_read>0) {
2300 if (fwrite_sha1_file(prev_buf,
2301 1,
2302 prev_read,
2303 freq) == prev_read) {
2304 prev_posn += prev_read;
2305 } else {
2306 prev_read = -1;
2307 }
2308 }
2309 } while (prev_read > 0);
2310 close(prevlocal);
2311 }
2312 unlink_or_warn(prevfile);
2313
2314 /*
2315 * Reset inflate/SHA1 if there was an error reading the previous temp
2316 * file; also rewind to the beginning of the local file.
2317 */
2318 if (prev_read == -1) {
2319 memset(&freq->stream, 0, sizeof(freq->stream));
2320 git_inflate_init(&freq->stream);
2321 git_SHA1_Init(&freq->c);
2322 if (prev_posn>0) {
2323 prev_posn = 0;
2324 lseek(freq->localfile, 0, SEEK_SET);
2325 if (ftruncate(freq->localfile, 0) < 0) {
2326 error_errno("Couldn't truncate temporary file %s",
2327 freq->tmpfile);
2328 goto abort;
2329 }
2330 }
2331 }
2332
2333 freq->slot = get_active_slot();
2334
2335 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2336 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2337 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2338 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2339 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2340 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2341
2342 /*
2343 * If we have successfully processed data from a previous fetch
2344 * attempt, only fetch the data we don't already have.
2345 */
2346 if (prev_posn>0) {
2347 if (http_is_verbose)
2348 fprintf(stderr,
2349 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2350 hex, (uintmax_t)prev_posn);
2351 http_opt_request_remainder(freq->slot->curl, prev_posn);
2352 }
2353
2354 return freq;
2355
2356 abort:
2357 free(freq->url);
2358 free(freq);
2359 return NULL;
2360 }
2361
2362 void process_http_object_request(struct http_object_request *freq)
2363 {
2364 if (freq->slot == NULL)
2365 return;
2366 freq->curl_result = freq->slot->curl_result;
2367 freq->http_code = freq->slot->http_code;
2368 freq->slot = NULL;
2369 }
2370
2371 int finish_http_object_request(struct http_object_request *freq)
2372 {
2373 struct stat st;
2374 struct strbuf filename = STRBUF_INIT;
2375
2376 close(freq->localfile);
2377 freq->localfile = -1;
2378
2379 process_http_object_request(freq);
2380
2381 if (freq->http_code == 416) {
2382 warning("requested range invalid; we may already have all the data.");
2383 } else if (freq->curl_result != CURLE_OK) {
2384 if (stat(freq->tmpfile, &st) == 0)
2385 if (st.st_size == 0)
2386 unlink_or_warn(freq->tmpfile);
2387 return -1;
2388 }
2389
2390 git_inflate_end(&freq->stream);
2391 git_SHA1_Final(freq->real_sha1, &freq->c);
2392 if (freq->zret != Z_STREAM_END) {
2393 unlink_or_warn(freq->tmpfile);
2394 return -1;
2395 }
2396 if (hashcmp(freq->sha1, freq->real_sha1)) {
2397 unlink_or_warn(freq->tmpfile);
2398 return -1;
2399 }
2400
2401 sha1_file_name(&filename, freq->sha1);
2402 freq->rename = finalize_object_file(freq->tmpfile, filename.buf);
2403 strbuf_release(&filename);
2404
2405 return freq->rename;
2406 }
2407
2408 void abort_http_object_request(struct http_object_request *freq)
2409 {
2410 unlink_or_warn(freq->tmpfile);
2411
2412 release_http_object_request(freq);
2413 }
2414
2415 void release_http_object_request(struct http_object_request *freq)
2416 {
2417 if (freq->localfile != -1) {
2418 close(freq->localfile);
2419 freq->localfile = -1;
2420 }
2421 if (freq->url != NULL) {
2422 FREE_AND_NULL(freq->url);
2423 }
2424 if (freq->slot != NULL) {
2425 freq->slot->callback_func = NULL;
2426 freq->slot->callback_data = NULL;
2427 release_active_slot(freq->slot);
2428 freq->slot = NULL;
2429 }
2430 }
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