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replace: avoid using die() to indicate a bug
[git/debian.git] / http.c
blob3034d10b6804387bc267b27757e2eae2279415d5
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 #include "object-store.h"
18
19 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
20 static int trace_curl_data = 1;
21 static struct string_list cookies_to_redact = STRING_LIST_INIT_DUP;
22 #if LIBCURL_VERSION_NUM >= 0x070a08
23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
24 #else
25 long int git_curl_ipresolve;
26 #endif
27 int active_requests;
28 int http_is_verbose;
29 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
30
31 #if LIBCURL_VERSION_NUM >= 0x070a06
32 #define LIBCURL_CAN_HANDLE_AUTH_ANY
33 #endif
34
35 static int min_curl_sessions = 1;
36 static int curl_session_count;
37 #ifdef USE_CURL_MULTI
38 static int max_requests = -1;
39 static CURLM *curlm;
40 #endif
41 #ifndef NO_CURL_EASY_DUPHANDLE
42 static CURL *curl_default;
43 #endif
44
45 #define PREV_BUF_SIZE 4096
46
47 char curl_errorstr[CURL_ERROR_SIZE];
48
49 static int curl_ssl_verify = -1;
50 static int curl_ssl_try;
51 static const char *ssl_cert;
52 static const char *ssl_cipherlist;
53 static const char *ssl_version;
54 static struct {
55 const char *name;
56 long ssl_version;
57 } sslversions[] = {
58 { "sslv2", CURL_SSLVERSION_SSLv2 },
59 { "sslv3", CURL_SSLVERSION_SSLv3 },
60 { "tlsv1", CURL_SSLVERSION_TLSv1 },
61 #if LIBCURL_VERSION_NUM >= 0x072200
62 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
63 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
64 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x073400
67 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
68 #endif
69 };
70 #if LIBCURL_VERSION_NUM >= 0x070903
71 static const char *ssl_key;
72 #endif
73 #if LIBCURL_VERSION_NUM >= 0x070908
74 static const char *ssl_capath;
75 #endif
76 #if LIBCURL_VERSION_NUM >= 0x071304
77 static const char *curl_no_proxy;
78 #endif
79 #if LIBCURL_VERSION_NUM >= 0x072c00
80 static const char *ssl_pinnedkey;
81 #endif
82 static const char *ssl_cainfo;
83 static long curl_low_speed_limit = -1;
84 static long curl_low_speed_time = -1;
85 static int curl_ftp_no_epsv;
86 static const char *curl_http_proxy;
87 static const char *http_proxy_authmethod;
88 static struct {
89 const char *name;
90 long curlauth_param;
91 } proxy_authmethods[] = {
92 { "basic", CURLAUTH_BASIC },
93 { "digest", CURLAUTH_DIGEST },
94 { "negotiate", CURLAUTH_GSSNEGOTIATE },
95 { "ntlm", CURLAUTH_NTLM },
96 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
97 { "anyauth", CURLAUTH_ANY },
98 #endif
99 /*
100 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
101 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
102 * here, too
103 */
104 };
105 #ifdef CURLGSSAPI_DELEGATION_FLAG
106 static const char *curl_deleg;
107 static struct {
108 const char *name;
109 long curl_deleg_param;
110 } curl_deleg_levels[] = {
111 { "none", CURLGSSAPI_DELEGATION_NONE },
112 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
113 { "always", CURLGSSAPI_DELEGATION_FLAG },
114 };
115 #endif
116
117 static struct credential proxy_auth = CREDENTIAL_INIT;
118 static const char *curl_proxyuserpwd;
119 static const char *curl_cookie_file;
120 static int curl_save_cookies;
121 struct credential http_auth = CREDENTIAL_INIT;
122 static int http_proactive_auth;
123 static const char *user_agent;
124 static int curl_empty_auth = -1;
125
126 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
127
128 #if LIBCURL_VERSION_NUM >= 0x071700
129 /* Use CURLOPT_KEYPASSWD as is */
130 #elif LIBCURL_VERSION_NUM >= 0x070903
131 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
132 #else
133 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
134 #endif
135
136 static struct credential cert_auth = CREDENTIAL_INIT;
137 static int ssl_cert_password_required;
138 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
139 static unsigned long http_auth_methods = CURLAUTH_ANY;
140 static int http_auth_methods_restricted;
141 /* Modes for which empty_auth cannot actually help us. */
142 static unsigned long empty_auth_useless =
143 CURLAUTH_BASIC
144 #ifdef CURLAUTH_DIGEST_IE
145 | CURLAUTH_DIGEST_IE
146 #endif
147 | CURLAUTH_DIGEST;
148 #endif
149
150 static struct curl_slist *pragma_header;
151 static struct curl_slist *no_pragma_header;
152 static struct curl_slist *extra_http_headers;
153
154 static struct active_request_slot *active_queue_head;
155
156 static char *cached_accept_language;
157
158 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
159 {
160 size_t size = eltsize * nmemb;
161 struct buffer *buffer = buffer_;
162
163 if (size > buffer->buf.len - buffer->posn)
164 size = buffer->buf.len - buffer->posn;
165 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
166 buffer->posn += size;
167
168 return size;
169 }
170
171 #ifndef NO_CURL_IOCTL
172 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
173 {
174 struct buffer *buffer = clientp;
175
176 switch (cmd) {
177 case CURLIOCMD_NOP:
178 return CURLIOE_OK;
179
180 case CURLIOCMD_RESTARTREAD:
181 buffer->posn = 0;
182 return CURLIOE_OK;
183
184 default:
185 return CURLIOE_UNKNOWNCMD;
186 }
187 }
188 #endif
189
190 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
191 {
192 size_t size = eltsize * nmemb;
193 struct strbuf *buffer = buffer_;
194
195 strbuf_add(buffer, ptr, size);
196 return size;
197 }
198
199 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
200 {
201 return eltsize * nmemb;
202 }
203
204 static void closedown_active_slot(struct active_request_slot *slot)
205 {
206 active_requests--;
207 slot->in_use = 0;
208 }
209
210 static void finish_active_slot(struct active_request_slot *slot)
211 {
212 closedown_active_slot(slot);
213 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
214
215 if (slot->finished != NULL)
216 (*slot->finished) = 1;
217
218 /* Store slot results so they can be read after the slot is reused */
219 if (slot->results != NULL) {
220 slot->results->curl_result = slot->curl_result;
221 slot->results->http_code = slot->http_code;
222 #if LIBCURL_VERSION_NUM >= 0x070a08
223 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
224 &slot->results->auth_avail);
225 #else
226 slot->results->auth_avail = 0;
227 #endif
228
229 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
230 &slot->results->http_connectcode);
231 }
232
233 /* Run callback if appropriate */
234 if (slot->callback_func != NULL)
235 slot->callback_func(slot->callback_data);
236 }
237
238 static void xmulti_remove_handle(struct active_request_slot *slot)
239 {
240 #ifdef USE_CURL_MULTI
241 curl_multi_remove_handle(curlm, slot->curl);
242 #endif
243 }
244
245 #ifdef USE_CURL_MULTI
246 static void process_curl_messages(void)
247 {
248 int num_messages;
249 struct active_request_slot *slot;
250 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
251
252 while (curl_message != NULL) {
253 if (curl_message->msg == CURLMSG_DONE) {
254 int curl_result = curl_message->data.result;
255 slot = active_queue_head;
256 while (slot != NULL &&
257 slot->curl != curl_message->easy_handle)
258 slot = slot->next;
259 if (slot != NULL) {
260 xmulti_remove_handle(slot);
261 slot->curl_result = curl_result;
262 finish_active_slot(slot);
263 } else {
264 fprintf(stderr, "Received DONE message for unknown request!\n");
265 }
266 } else {
267 fprintf(stderr, "Unknown CURL message received: %d\n",
268 (int)curl_message->msg);
269 }
270 curl_message = curl_multi_info_read(curlm, &num_messages);
271 }
272 }
273 #endif
274
275 static int http_options(const char *var, const char *value, void *cb)
276 {
277 if (!strcmp("http.sslverify", var)) {
278 curl_ssl_verify = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp("http.sslcipherlist", var))
282 return git_config_string(&ssl_cipherlist, var, value);
283 if (!strcmp("http.sslversion", var))
284 return git_config_string(&ssl_version, var, value);
285 if (!strcmp("http.sslcert", var))
286 return git_config_pathname(&ssl_cert, var, value);
287 #if LIBCURL_VERSION_NUM >= 0x070903
288 if (!strcmp("http.sslkey", var))
289 return git_config_pathname(&ssl_key, var, value);
290 #endif
291 #if LIBCURL_VERSION_NUM >= 0x070908
292 if (!strcmp("http.sslcapath", var))
293 return git_config_pathname(&ssl_capath, var, value);
294 #endif
295 if (!strcmp("http.sslcainfo", var))
296 return git_config_pathname(&ssl_cainfo, var, value);
297 if (!strcmp("http.sslcertpasswordprotected", var)) {
298 ssl_cert_password_required = git_config_bool(var, value);
299 return 0;
300 }
301 if (!strcmp("http.ssltry", var)) {
302 curl_ssl_try = git_config_bool(var, value);
303 return 0;
304 }
305 if (!strcmp("http.minsessions", var)) {
306 min_curl_sessions = git_config_int(var, value);
307 #ifndef USE_CURL_MULTI
308 if (min_curl_sessions > 1)
309 min_curl_sessions = 1;
310 #endif
311 return 0;
312 }
313 #ifdef USE_CURL_MULTI
314 if (!strcmp("http.maxrequests", var)) {
315 max_requests = git_config_int(var, value);
316 return 0;
317 }
318 #endif
319 if (!strcmp("http.lowspeedlimit", var)) {
320 curl_low_speed_limit = (long)git_config_int(var, value);
321 return 0;
322 }
323 if (!strcmp("http.lowspeedtime", var)) {
324 curl_low_speed_time = (long)git_config_int(var, value);
325 return 0;
326 }
327
328 if (!strcmp("http.noepsv", var)) {
329 curl_ftp_no_epsv = git_config_bool(var, value);
330 return 0;
331 }
332 if (!strcmp("http.proxy", var))
333 return git_config_string(&curl_http_proxy, var, value);
334
335 if (!strcmp("http.proxyauthmethod", var))
336 return git_config_string(&http_proxy_authmethod, var, value);
337
338 if (!strcmp("http.cookiefile", var))
339 return git_config_pathname(&curl_cookie_file, var, value);
340 if (!strcmp("http.savecookies", var)) {
341 curl_save_cookies = git_config_bool(var, value);
342 return 0;
343 }
344
345 if (!strcmp("http.postbuffer", var)) {
346 http_post_buffer = git_config_ssize_t(var, value);
347 if (http_post_buffer < 0)
348 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
349 if (http_post_buffer < LARGE_PACKET_MAX)
350 http_post_buffer = LARGE_PACKET_MAX;
351 return 0;
352 }
353
354 if (!strcmp("http.useragent", var))
355 return git_config_string(&user_agent, var, value);
356
357 if (!strcmp("http.emptyauth", var)) {
358 if (value && !strcmp("auto", value))
359 curl_empty_auth = -1;
360 else
361 curl_empty_auth = git_config_bool(var, value);
362 return 0;
363 }
364
365 if (!strcmp("http.delegation", var)) {
366 #ifdef CURLGSSAPI_DELEGATION_FLAG
367 return git_config_string(&curl_deleg, var, value);
368 #else
369 warning(_("Delegation control is not supported with cURL < 7.22.0"));
370 return 0;
371 #endif
372 }
373
374 if (!strcmp("http.pinnedpubkey", var)) {
375 #if LIBCURL_VERSION_NUM >= 0x072c00
376 return git_config_pathname(&ssl_pinnedkey, var, value);
377 #else
378 warning(_("Public key pinning not supported with cURL < 7.44.0"));
379 return 0;
380 #endif
381 }
382
383 if (!strcmp("http.extraheader", var)) {
384 if (!value) {
385 return config_error_nonbool(var);
386 } else if (!*value) {
387 curl_slist_free_all(extra_http_headers);
388 extra_http_headers = NULL;
389 } else {
390 extra_http_headers =
391 curl_slist_append(extra_http_headers, value);
392 }
393 return 0;
394 }
395
396 if (!strcmp("http.followredirects", var)) {
397 if (value && !strcmp(value, "initial"))
398 http_follow_config = HTTP_FOLLOW_INITIAL;
399 else if (git_config_bool(var, value))
400 http_follow_config = HTTP_FOLLOW_ALWAYS;
401 else
402 http_follow_config = HTTP_FOLLOW_NONE;
403 return 0;
404 }
405
406 /* Fall back on the default ones */
407 return git_default_config(var, value, cb);
408 }
409
410 static int curl_empty_auth_enabled(void)
411 {
412 if (curl_empty_auth >= 0)
413 return curl_empty_auth;
414
415 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
416 /*
417 * Our libcurl is too old to do AUTH_ANY in the first place;
418 * just default to turning the feature off.
419 */
420 #else
421 /*
422 * In the automatic case, kick in the empty-auth
423 * hack as long as we would potentially try some
424 * method more exotic than "Basic" or "Digest".
425 *
426 * But only do this when this is our second or
427 * subsequent request, as by then we know what
428 * methods are available.
429 */
430 if (http_auth_methods_restricted &&
431 (http_auth_methods & ~empty_auth_useless))
432 return 1;
433 #endif
434 return 0;
435 }
436
437 static void init_curl_http_auth(CURL *result)
438 {
439 if (!http_auth.username || !*http_auth.username) {
440 if (curl_empty_auth_enabled())
441 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
442 return;
443 }
444
445 credential_fill(&http_auth);
446
447 #if LIBCURL_VERSION_NUM >= 0x071301
448 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
449 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
450 #else
451 {
452 static struct strbuf up = STRBUF_INIT;
453 /*
454 * Note that we assume we only ever have a single set of
455 * credentials in a given program run, so we do not have
456 * to worry about updating this buffer, only setting its
457 * initial value.
458 */
459 if (!up.len)
460 strbuf_addf(&up, "%s:%s",
461 http_auth.username, http_auth.password);
462 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
463 }
464 #endif
465 }
466
467 /* *var must be free-able */
468 static void var_override(const char **var, char *value)
469 {
470 if (value) {
471 free((void *)*var);
472 *var = xstrdup(value);
473 }
474 }
475
476 static void set_proxyauth_name_password(CURL *result)
477 {
478 #if LIBCURL_VERSION_NUM >= 0x071301
479 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
480 proxy_auth.username);
481 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
482 proxy_auth.password);
483 #else
484 struct strbuf s = STRBUF_INIT;
485
486 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
487 strbuf_addch(&s, ':');
488 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
489 curl_proxyuserpwd = strbuf_detach(&s, NULL);
490 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
491 #endif
492 }
493
494 static void init_curl_proxy_auth(CURL *result)
495 {
496 if (proxy_auth.username) {
497 if (!proxy_auth.password)
498 credential_fill(&proxy_auth);
499 set_proxyauth_name_password(result);
500 }
501
502 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
503
504 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
505 if (http_proxy_authmethod) {
506 int i;
507 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
508 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
509 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
510 proxy_authmethods[i].curlauth_param);
511 break;
512 }
513 }
514 if (i == ARRAY_SIZE(proxy_authmethods)) {
515 warning("unsupported proxy authentication method %s: using anyauth",
516 http_proxy_authmethod);
517 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
518 }
519 }
520 else
521 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
522 #endif
523 }
524
525 static int has_cert_password(void)
526 {
527 if (ssl_cert == NULL || ssl_cert_password_required != 1)
528 return 0;
529 if (!cert_auth.password) {
530 cert_auth.protocol = xstrdup("cert");
531 cert_auth.username = xstrdup("");
532 cert_auth.path = xstrdup(ssl_cert);
533 credential_fill(&cert_auth);
534 }
535 return 1;
536 }
537
538 #if LIBCURL_VERSION_NUM >= 0x071900
539 static void set_curl_keepalive(CURL *c)
540 {
541 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
542 }
543
544 #elif LIBCURL_VERSION_NUM >= 0x071000
545 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
546 {
547 int ka = 1;
548 int rc;
549 socklen_t len = (socklen_t)sizeof(ka);
550
551 if (type != CURLSOCKTYPE_IPCXN)
552 return 0;
553
554 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
555 if (rc < 0)
556 warning_errno("unable to set SO_KEEPALIVE on socket");
557
558 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
559 }
560
561 static void set_curl_keepalive(CURL *c)
562 {
563 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
564 }
565
566 #else
567 static void set_curl_keepalive(CURL *c)
568 {
569 /* not supported on older curl versions */
570 }
571 #endif
572
573 static void redact_sensitive_header(struct strbuf *header)
574 {
575 const char *sensitive_header;
576
577 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
578 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
579 /* The first token is the type, which is OK to log */
580 while (isspace(*sensitive_header))
581 sensitive_header++;
582 while (*sensitive_header && !isspace(*sensitive_header))
583 sensitive_header++;
584 /* Everything else is opaque and possibly sensitive */
585 strbuf_setlen(header, sensitive_header - header->buf);
586 strbuf_addstr(header, " <redacted>");
587 } else if (cookies_to_redact.nr &&
588 skip_prefix(header->buf, "Cookie:", &sensitive_header)) {
589 struct strbuf redacted_header = STRBUF_INIT;
590 char *cookie;
591
592 while (isspace(*sensitive_header))
593 sensitive_header++;
594
595 /*
596 * The contents of header starting from sensitive_header will
597 * subsequently be overridden, so it is fine to mutate this
598 * string (hence the assignment to "char *").
599 */
600 cookie = (char *) sensitive_header;
601
602 while (cookie) {
603 char *equals;
604 char *semicolon = strstr(cookie, "; ");
605 if (semicolon)
606 *semicolon = 0;
607 equals = strchrnul(cookie, '=');
608 if (!equals) {
609 /* invalid cookie, just append and continue */
610 strbuf_addstr(&redacted_header, cookie);
611 continue;
612 }
613 *equals = 0; /* temporarily set to NUL for lookup */
614 if (string_list_lookup(&cookies_to_redact, cookie)) {
615 strbuf_addstr(&redacted_header, cookie);
616 strbuf_addstr(&redacted_header, "=<redacted>");
617 } else {
618 *equals = '=';
619 strbuf_addstr(&redacted_header, cookie);
620 }
621 if (semicolon) {
622 /*
623 * There are more cookies. (Or, for some
624 * reason, the input string ends in "; ".)
625 */
626 strbuf_addstr(&redacted_header, "; ");
627 cookie = semicolon + strlen("; ");
628 } else {
629 cookie = NULL;
630 }
631 }
632
633 strbuf_setlen(header, sensitive_header - header->buf);
634 strbuf_addbuf(header, &redacted_header);
635 }
636 }
637
638 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
639 {
640 struct strbuf out = STRBUF_INIT;
641 struct strbuf **headers, **header;
642
643 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
644 text, (long)size, (long)size);
645 trace_strbuf(&trace_curl, &out);
646 strbuf_reset(&out);
647 strbuf_add(&out, ptr, size);
648 headers = strbuf_split_max(&out, '\n', 0);
649
650 for (header = headers; *header; header++) {
651 if (hide_sensitive_header)
652 redact_sensitive_header(*header);
653 strbuf_insert((*header), 0, text, strlen(text));
654 strbuf_insert((*header), strlen(text), ": ", 2);
655 strbuf_rtrim((*header));
656 strbuf_addch((*header), '\n');
657 trace_strbuf(&trace_curl, (*header));
658 }
659 strbuf_list_free(headers);
660 strbuf_release(&out);
661 }
662
663 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
664 {
665 size_t i;
666 struct strbuf out = STRBUF_INIT;
667 unsigned int width = 60;
668
669 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
670 text, (long)size, (long)size);
671 trace_strbuf(&trace_curl, &out);
672
673 for (i = 0; i < size; i += width) {
674 size_t w;
675
676 strbuf_reset(&out);
677 strbuf_addf(&out, "%s: ", text);
678 for (w = 0; (w < width) && (i + w < size); w++) {
679 unsigned char ch = ptr[i + w];
680
681 strbuf_addch(&out,
682 (ch >= 0x20) && (ch < 0x80)
683 ? ch : '.');
684 }
685 strbuf_addch(&out, '\n');
686 trace_strbuf(&trace_curl, &out);
687 }
688 strbuf_release(&out);
689 }
690
691 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
692 {
693 const char *text;
694 enum { NO_FILTER = 0, DO_FILTER = 1 };
695
696 switch (type) {
697 case CURLINFO_TEXT:
698 trace_printf_key(&trace_curl, "== Info: %s", data);
699 break;
700 case CURLINFO_HEADER_OUT:
701 text = "=> Send header";
702 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
703 break;
704 case CURLINFO_DATA_OUT:
705 if (trace_curl_data) {
706 text = "=> Send data";
707 curl_dump_data(text, (unsigned char *)data, size);
708 }
709 break;
710 case CURLINFO_SSL_DATA_OUT:
711 if (trace_curl_data) {
712 text = "=> Send SSL data";
713 curl_dump_data(text, (unsigned char *)data, size);
714 }
715 break;
716 case CURLINFO_HEADER_IN:
717 text = "<= Recv header";
718 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
719 break;
720 case CURLINFO_DATA_IN:
721 if (trace_curl_data) {
722 text = "<= Recv data";
723 curl_dump_data(text, (unsigned char *)data, size);
724 }
725 break;
726 case CURLINFO_SSL_DATA_IN:
727 if (trace_curl_data) {
728 text = "<= Recv SSL data";
729 curl_dump_data(text, (unsigned char *)data, size);
730 }
731 break;
732
733 default: /* we ignore unknown types by default */
734 return 0;
735 }
736 return 0;
737 }
738
739 void setup_curl_trace(CURL *handle)
740 {
741 if (!trace_want(&trace_curl))
742 return;
743 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
744 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
745 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
746 }
747
748 #ifdef CURLPROTO_HTTP
749 static long get_curl_allowed_protocols(int from_user)
750 {
751 long allowed_protocols = 0;
752
753 if (is_transport_allowed("http", from_user))
754 allowed_protocols |= CURLPROTO_HTTP;
755 if (is_transport_allowed("https", from_user))
756 allowed_protocols |= CURLPROTO_HTTPS;
757 if (is_transport_allowed("ftp", from_user))
758 allowed_protocols |= CURLPROTO_FTP;
759 if (is_transport_allowed("ftps", from_user))
760 allowed_protocols |= CURLPROTO_FTPS;
761
762 return allowed_protocols;
763 }
764 #endif
765
766 static CURL *get_curl_handle(void)
767 {
768 CURL *result = curl_easy_init();
769
770 if (!result)
771 die("curl_easy_init failed");
772
773 if (!curl_ssl_verify) {
774 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
775 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
776 } else {
777 /* Verify authenticity of the peer's certificate */
778 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
779 /* The name in the cert must match whom we tried to connect */
780 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
781 }
782
783 #if LIBCURL_VERSION_NUM >= 0x070907
784 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
785 #endif
786 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
787 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
788 #endif
789
790 #ifdef CURLGSSAPI_DELEGATION_FLAG
791 if (curl_deleg) {
792 int i;
793 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
794 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
795 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
796 curl_deleg_levels[i].curl_deleg_param);
797 break;
798 }
799 }
800 if (i == ARRAY_SIZE(curl_deleg_levels))
801 warning("Unknown delegation method '%s': using default",
802 curl_deleg);
803 }
804 #endif
805
806 if (http_proactive_auth)
807 init_curl_http_auth(result);
808
809 if (getenv("GIT_SSL_VERSION"))
810 ssl_version = getenv("GIT_SSL_VERSION");
811 if (ssl_version && *ssl_version) {
812 int i;
813 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
814 if (!strcmp(ssl_version, sslversions[i].name)) {
815 curl_easy_setopt(result, CURLOPT_SSLVERSION,
816 sslversions[i].ssl_version);
817 break;
818 }
819 }
820 if (i == ARRAY_SIZE(sslversions))
821 warning("unsupported ssl version %s: using default",
822 ssl_version);
823 }
824
825 if (getenv("GIT_SSL_CIPHER_LIST"))
826 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
827 if (ssl_cipherlist != NULL && *ssl_cipherlist)
828 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
829 ssl_cipherlist);
830
831 if (ssl_cert != NULL)
832 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
833 if (has_cert_password())
834 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
835 #if LIBCURL_VERSION_NUM >= 0x070903
836 if (ssl_key != NULL)
837 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
838 #endif
839 #if LIBCURL_VERSION_NUM >= 0x070908
840 if (ssl_capath != NULL)
841 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
842 #endif
843 #if LIBCURL_VERSION_NUM >= 0x072c00
844 if (ssl_pinnedkey != NULL)
845 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
846 #endif
847 if (ssl_cainfo != NULL)
848 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
849
850 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
851 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
852 curl_low_speed_limit);
853 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
854 curl_low_speed_time);
855 }
856
857 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
858 #if LIBCURL_VERSION_NUM >= 0x071301
859 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
860 #elif LIBCURL_VERSION_NUM >= 0x071101
861 curl_easy_setopt(result, CURLOPT_POST301, 1);
862 #endif
863 #ifdef CURLPROTO_HTTP
864 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
865 get_curl_allowed_protocols(0));
866 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
867 get_curl_allowed_protocols(-1));
868 #else
869 warning("protocol restrictions not applied to curl redirects because\n"
870 "your curl version is too old (>= 7.19.4)");
871 #endif
872 if (getenv("GIT_CURL_VERBOSE"))
873 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
874 setup_curl_trace(result);
875 if (getenv("GIT_TRACE_CURL_NO_DATA"))
876 trace_curl_data = 0;
877 if (getenv("GIT_REDACT_COOKIES")) {
878 string_list_split(&cookies_to_redact,
879 getenv("GIT_REDACT_COOKIES"), ',', -1);
880 string_list_sort(&cookies_to_redact);
881 }
882
883 curl_easy_setopt(result, CURLOPT_USERAGENT,
884 user_agent ? user_agent : git_user_agent());
885
886 if (curl_ftp_no_epsv)
887 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
888
889 #ifdef CURLOPT_USE_SSL
890 if (curl_ssl_try)
891 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
892 #endif
893
894 /*
895 * CURL also examines these variables as a fallback; but we need to query
896 * them here in order to decide whether to prompt for missing password (cf.
897 * init_curl_proxy_auth()).
898 *
899 * Unlike many other common environment variables, these are historically
900 * lowercase only. It appears that CURL did not know this and implemented
901 * only uppercase variants, which was later corrected to take both - with
902 * the exception of http_proxy, which is lowercase only also in CURL. As
903 * the lowercase versions are the historical quasi-standard, they take
904 * precedence here, as in CURL.
905 */
906 if (!curl_http_proxy) {
907 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
908 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
909 var_override(&curl_http_proxy, getenv("https_proxy"));
910 } else {
911 var_override(&curl_http_proxy, getenv("http_proxy"));
912 }
913 if (!curl_http_proxy) {
914 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
915 var_override(&curl_http_proxy, getenv("all_proxy"));
916 }
917 }
918
919 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
920 /*
921 * Handle case with the empty http.proxy value here to keep
922 * common code clean.
923 * NB: empty option disables proxying at all.
924 */
925 curl_easy_setopt(result, CURLOPT_PROXY, "");
926 } else if (curl_http_proxy) {
927 #if LIBCURL_VERSION_NUM >= 0x071800
928 if (starts_with(curl_http_proxy, "socks5h"))
929 curl_easy_setopt(result,
930 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
931 else if (starts_with(curl_http_proxy, "socks5"))
932 curl_easy_setopt(result,
933 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
934 else if (starts_with(curl_http_proxy, "socks4a"))
935 curl_easy_setopt(result,
936 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
937 else if (starts_with(curl_http_proxy, "socks"))
938 curl_easy_setopt(result,
939 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
940 #endif
941 #if LIBCURL_VERSION_NUM >= 0x073400
942 else if (starts_with(curl_http_proxy, "https"))
943 curl_easy_setopt(result,
944 CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
945 #endif
946 if (strstr(curl_http_proxy, "://"))
947 credential_from_url(&proxy_auth, curl_http_proxy);
948 else {
949 struct strbuf url = STRBUF_INIT;
950 strbuf_addf(&url, "http://%s", curl_http_proxy);
951 credential_from_url(&proxy_auth, url.buf);
952 strbuf_release(&url);
953 }
954
955 if (!proxy_auth.host)
956 die("Invalid proxy URL '%s'", curl_http_proxy);
957
958 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
959 #if LIBCURL_VERSION_NUM >= 0x071304
960 var_override(&curl_no_proxy, getenv("NO_PROXY"));
961 var_override(&curl_no_proxy, getenv("no_proxy"));
962 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
963 #endif
964 }
965 init_curl_proxy_auth(result);
966
967 set_curl_keepalive(result);
968
969 return result;
970 }
971
972 static void set_from_env(const char **var, const char *envname)
973 {
974 const char *val = getenv(envname);
975 if (val)
976 *var = val;
977 }
978
979 static void protocol_http_header(void)
980 {
981 if (get_protocol_version_config() > 0) {
982 struct strbuf protocol_header = STRBUF_INIT;
983
984 strbuf_addf(&protocol_header, GIT_PROTOCOL_HEADER ": version=%d",
985 get_protocol_version_config());
986
987
988 extra_http_headers = curl_slist_append(extra_http_headers,
989 protocol_header.buf);
990 strbuf_release(&protocol_header);
991 }
992 }
993
994 void http_init(struct remote *remote, const char *url, int proactive_auth)
995 {
996 char *low_speed_limit;
997 char *low_speed_time;
998 char *normalized_url;
999 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
1000
1001 config.section = "http";
1002 config.key = NULL;
1003 config.collect_fn = http_options;
1004 config.cascade_fn = git_default_config;
1005 config.cb = NULL;
1006
1007 http_is_verbose = 0;
1008 normalized_url = url_normalize(url, &config.url);
1009
1010 git_config(urlmatch_config_entry, &config);
1011 free(normalized_url);
1012
1013 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1014 die("curl_global_init failed");
1015
1016 http_proactive_auth = proactive_auth;
1017
1018 if (remote && remote->http_proxy)
1019 curl_http_proxy = xstrdup(remote->http_proxy);
1020
1021 if (remote)
1022 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1023
1024 protocol_http_header();
1025
1026 pragma_header = curl_slist_append(http_copy_default_headers(),
1027 "Pragma: no-cache");
1028 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1029 "Pragma:");
1030
1031 #ifdef USE_CURL_MULTI
1032 {
1033 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1034 if (http_max_requests != NULL)
1035 max_requests = atoi(http_max_requests);
1036 }
1037
1038 curlm = curl_multi_init();
1039 if (!curlm)
1040 die("curl_multi_init failed");
1041 #endif
1042
1043 if (getenv("GIT_SSL_NO_VERIFY"))
1044 curl_ssl_verify = 0;
1045
1046 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1047 #if LIBCURL_VERSION_NUM >= 0x070903
1048 set_from_env(&ssl_key, "GIT_SSL_KEY");
1049 #endif
1050 #if LIBCURL_VERSION_NUM >= 0x070908
1051 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1052 #endif
1053 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1054
1055 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1056
1057 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1058 if (low_speed_limit != NULL)
1059 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1060 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1061 if (low_speed_time != NULL)
1062 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1063
1064 if (curl_ssl_verify == -1)
1065 curl_ssl_verify = 1;
1066
1067 curl_session_count = 0;
1068 #ifdef USE_CURL_MULTI
1069 if (max_requests < 1)
1070 max_requests = DEFAULT_MAX_REQUESTS;
1071 #endif
1072
1073 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1074 curl_ftp_no_epsv = 1;
1075
1076 if (url) {
1077 credential_from_url(&http_auth, url);
1078 if (!ssl_cert_password_required &&
1079 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1080 starts_with(url, "https://"))
1081 ssl_cert_password_required = 1;
1082 }
1083
1084 #ifndef NO_CURL_EASY_DUPHANDLE
1085 curl_default = get_curl_handle();
1086 #endif
1087 }
1088
1089 void http_cleanup(void)
1090 {
1091 struct active_request_slot *slot = active_queue_head;
1092
1093 while (slot != NULL) {
1094 struct active_request_slot *next = slot->next;
1095 if (slot->curl != NULL) {
1096 xmulti_remove_handle(slot);
1097 curl_easy_cleanup(slot->curl);
1098 }
1099 free(slot);
1100 slot = next;
1101 }
1102 active_queue_head = NULL;
1103
1104 #ifndef NO_CURL_EASY_DUPHANDLE
1105 curl_easy_cleanup(curl_default);
1106 #endif
1107
1108 #ifdef USE_CURL_MULTI
1109 curl_multi_cleanup(curlm);
1110 #endif
1111 curl_global_cleanup();
1112
1113 curl_slist_free_all(extra_http_headers);
1114 extra_http_headers = NULL;
1115
1116 curl_slist_free_all(pragma_header);
1117 pragma_header = NULL;
1118
1119 curl_slist_free_all(no_pragma_header);
1120 no_pragma_header = NULL;
1121
1122 if (curl_http_proxy) {
1123 free((void *)curl_http_proxy);
1124 curl_http_proxy = NULL;
1125 }
1126
1127 if (proxy_auth.password) {
1128 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1129 FREE_AND_NULL(proxy_auth.password);
1130 }
1131
1132 free((void *)curl_proxyuserpwd);
1133 curl_proxyuserpwd = NULL;
1134
1135 free((void *)http_proxy_authmethod);
1136 http_proxy_authmethod = NULL;
1137
1138 if (cert_auth.password != NULL) {
1139 memset(cert_auth.password, 0, strlen(cert_auth.password));
1140 FREE_AND_NULL(cert_auth.password);
1141 }
1142 ssl_cert_password_required = 0;
1143
1144 FREE_AND_NULL(cached_accept_language);
1145 }
1146
1147 struct active_request_slot *get_active_slot(void)
1148 {
1149 struct active_request_slot *slot = active_queue_head;
1150 struct active_request_slot *newslot;
1151
1152 #ifdef USE_CURL_MULTI
1153 int num_transfers;
1154
1155 /* Wait for a slot to open up if the queue is full */
1156 while (active_requests >= max_requests) {
1157 curl_multi_perform(curlm, &num_transfers);
1158 if (num_transfers < active_requests)
1159 process_curl_messages();
1160 }
1161 #endif
1162
1163 while (slot != NULL && slot->in_use)
1164 slot = slot->next;
1165
1166 if (slot == NULL) {
1167 newslot = xmalloc(sizeof(*newslot));
1168 newslot->curl = NULL;
1169 newslot->in_use = 0;
1170 newslot->next = NULL;
1171
1172 slot = active_queue_head;
1173 if (slot == NULL) {
1174 active_queue_head = newslot;
1175 } else {
1176 while (slot->next != NULL)
1177 slot = slot->next;
1178 slot->next = newslot;
1179 }
1180 slot = newslot;
1181 }
1182
1183 if (slot->curl == NULL) {
1184 #ifdef NO_CURL_EASY_DUPHANDLE
1185 slot->curl = get_curl_handle();
1186 #else
1187 slot->curl = curl_easy_duphandle(curl_default);
1188 #endif
1189 curl_session_count++;
1190 }
1191
1192 active_requests++;
1193 slot->in_use = 1;
1194 slot->results = NULL;
1195 slot->finished = NULL;
1196 slot->callback_data = NULL;
1197 slot->callback_func = NULL;
1198 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1199 if (curl_save_cookies)
1200 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1201 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1202 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1203 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1204 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1205 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1206 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1207 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1208 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1209 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1210 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1211
1212 /*
1213 * Default following to off unless "ALWAYS" is configured; this gives
1214 * callers a sane starting point, and they can tweak for individual
1215 * HTTP_FOLLOW_* cases themselves.
1216 */
1217 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1218 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1219 else
1220 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1221
1222 #if LIBCURL_VERSION_NUM >= 0x070a08
1223 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1224 #endif
1225 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1226 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1227 #endif
1228 if (http_auth.password || curl_empty_auth_enabled())
1229 init_curl_http_auth(slot->curl);
1230
1231 return slot;
1232 }
1233
1234 int start_active_slot(struct active_request_slot *slot)
1235 {
1236 #ifdef USE_CURL_MULTI
1237 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1238 int num_transfers;
1239
1240 if (curlm_result != CURLM_OK &&
1241 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1242 warning("curl_multi_add_handle failed: %s",
1243 curl_multi_strerror(curlm_result));
1244 active_requests--;
1245 slot->in_use = 0;
1246 return 0;
1247 }
1248
1249 /*
1250 * We know there must be something to do, since we just added
1251 * something.
1252 */
1253 curl_multi_perform(curlm, &num_transfers);
1254 #endif
1255 return 1;
1256 }
1257
1258 #ifdef USE_CURL_MULTI
1259 struct fill_chain {
1260 void *data;
1261 int (*fill)(void *);
1262 struct fill_chain *next;
1263 };
1264
1265 static struct fill_chain *fill_cfg;
1266
1267 void add_fill_function(void *data, int (*fill)(void *))
1268 {
1269 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1270 struct fill_chain **linkp = &fill_cfg;
1271 new_fill->data = data;
1272 new_fill->fill = fill;
1273 new_fill->next = NULL;
1274 while (*linkp)
1275 linkp = &(*linkp)->next;
1276 *linkp = new_fill;
1277 }
1278
1279 void fill_active_slots(void)
1280 {
1281 struct active_request_slot *slot = active_queue_head;
1282
1283 while (active_requests < max_requests) {
1284 struct fill_chain *fill;
1285 for (fill = fill_cfg; fill; fill = fill->next)
1286 if (fill->fill(fill->data))
1287 break;
1288
1289 if (!fill)
1290 break;
1291 }
1292
1293 while (slot != NULL) {
1294 if (!slot->in_use && slot->curl != NULL
1295 && curl_session_count > min_curl_sessions) {
1296 curl_easy_cleanup(slot->curl);
1297 slot->curl = NULL;
1298 curl_session_count--;
1299 }
1300 slot = slot->next;
1301 }
1302 }
1303
1304 void step_active_slots(void)
1305 {
1306 int num_transfers;
1307 CURLMcode curlm_result;
1308
1309 do {
1310 curlm_result = curl_multi_perform(curlm, &num_transfers);
1311 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1312 if (num_transfers < active_requests) {
1313 process_curl_messages();
1314 fill_active_slots();
1315 }
1316 }
1317 #endif
1318
1319 void run_active_slot(struct active_request_slot *slot)
1320 {
1321 #ifdef USE_CURL_MULTI
1322 fd_set readfds;
1323 fd_set writefds;
1324 fd_set excfds;
1325 int max_fd;
1326 struct timeval select_timeout;
1327 int finished = 0;
1328
1329 slot->finished = &finished;
1330 while (!finished) {
1331 step_active_slots();
1332
1333 if (slot->in_use) {
1334 #if LIBCURL_VERSION_NUM >= 0x070f04
1335 long curl_timeout;
1336 curl_multi_timeout(curlm, &curl_timeout);
1337 if (curl_timeout == 0) {
1338 continue;
1339 } else if (curl_timeout == -1) {
1340 select_timeout.tv_sec = 0;
1341 select_timeout.tv_usec = 50000;
1342 } else {
1343 select_timeout.tv_sec = curl_timeout / 1000;
1344 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1345 }
1346 #else
1347 select_timeout.tv_sec = 0;
1348 select_timeout.tv_usec = 50000;
1349 #endif
1350
1351 max_fd = -1;
1352 FD_ZERO(&readfds);
1353 FD_ZERO(&writefds);
1354 FD_ZERO(&excfds);
1355 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1356
1357 /*
1358 * It can happen that curl_multi_timeout returns a pathologically
1359 * long timeout when curl_multi_fdset returns no file descriptors
1360 * to read. See commit message for more details.
1361 */
1362 if (max_fd < 0 &&
1363 (select_timeout.tv_sec > 0 ||
1364 select_timeout.tv_usec > 50000)) {
1365 select_timeout.tv_sec = 0;
1366 select_timeout.tv_usec = 50000;
1367 }
1368
1369 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1370 }
1371 }
1372 #else
1373 while (slot->in_use) {
1374 slot->curl_result = curl_easy_perform(slot->curl);
1375 finish_active_slot(slot);
1376 }
1377 #endif
1378 }
1379
1380 static void release_active_slot(struct active_request_slot *slot)
1381 {
1382 closedown_active_slot(slot);
1383 if (slot->curl) {
1384 xmulti_remove_handle(slot);
1385 if (curl_session_count > min_curl_sessions) {
1386 curl_easy_cleanup(slot->curl);
1387 slot->curl = NULL;
1388 curl_session_count--;
1389 }
1390 }
1391 #ifdef USE_CURL_MULTI
1392 fill_active_slots();
1393 #endif
1394 }
1395
1396 void finish_all_active_slots(void)
1397 {
1398 struct active_request_slot *slot = active_queue_head;
1399
1400 while (slot != NULL)
1401 if (slot->in_use) {
1402 run_active_slot(slot);
1403 slot = active_queue_head;
1404 } else {
1405 slot = slot->next;
1406 }
1407 }
1408
1409 /* Helpers for modifying and creating URLs */
1410 static inline int needs_quote(int ch)
1411 {
1412 if (((ch >= 'A') && (ch <= 'Z'))
1413 || ((ch >= 'a') && (ch <= 'z'))
1414 || ((ch >= '0') && (ch <= '9'))
1415 || (ch == '/')
1416 || (ch == '-')
1417 || (ch == '.'))
1418 return 0;
1419 return 1;
1420 }
1421
1422 static char *quote_ref_url(const char *base, const char *ref)
1423 {
1424 struct strbuf buf = STRBUF_INIT;
1425 const char *cp;
1426 int ch;
1427
1428 end_url_with_slash(&buf, base);
1429
1430 for (cp = ref; (ch = *cp) != 0; cp++)
1431 if (needs_quote(ch))
1432 strbuf_addf(&buf, "%%%02x", ch);
1433 else
1434 strbuf_addch(&buf, *cp);
1435
1436 return strbuf_detach(&buf, NULL);
1437 }
1438
1439 void append_remote_object_url(struct strbuf *buf, const char *url,
1440 const char *hex,
1441 int only_two_digit_prefix)
1442 {
1443 end_url_with_slash(buf, url);
1444
1445 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1446 if (!only_two_digit_prefix)
1447 strbuf_addstr(buf, hex + 2);
1448 }
1449
1450 char *get_remote_object_url(const char *url, const char *hex,
1451 int only_two_digit_prefix)
1452 {
1453 struct strbuf buf = STRBUF_INIT;
1454 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1455 return strbuf_detach(&buf, NULL);
1456 }
1457
1458 static int handle_curl_result(struct slot_results *results)
1459 {
1460 /*
1461 * If we see a failing http code with CURLE_OK, we have turned off
1462 * FAILONERROR (to keep the server's custom error response), and should
1463 * translate the code into failure here.
1464 *
1465 * Likewise, if we see a redirect (30x code), that means we turned off
1466 * redirect-following, and we should treat the result as an error.
1467 */
1468 if (results->curl_result == CURLE_OK &&
1469 results->http_code >= 300) {
1470 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1471 /*
1472 * Normally curl will already have put the "reason phrase"
1473 * from the server into curl_errorstr; unfortunately without
1474 * FAILONERROR it is lost, so we can give only the numeric
1475 * status code.
1476 */
1477 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1478 "The requested URL returned error: %ld",
1479 results->http_code);
1480 }
1481
1482 if (results->curl_result == CURLE_OK) {
1483 credential_approve(&http_auth);
1484 if (proxy_auth.password)
1485 credential_approve(&proxy_auth);
1486 return HTTP_OK;
1487 } else if (missing_target(results))
1488 return HTTP_MISSING_TARGET;
1489 else if (results->http_code == 401) {
1490 if (http_auth.username && http_auth.password) {
1491 credential_reject(&http_auth);
1492 return HTTP_NOAUTH;
1493 } else {
1494 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1495 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1496 if (results->auth_avail) {
1497 http_auth_methods &= results->auth_avail;
1498 http_auth_methods_restricted = 1;
1499 }
1500 #endif
1501 return HTTP_REAUTH;
1502 }
1503 } else {
1504 if (results->http_connectcode == 407)
1505 credential_reject(&proxy_auth);
1506 #if LIBCURL_VERSION_NUM >= 0x070c00
1507 if (!curl_errorstr[0])
1508 strlcpy(curl_errorstr,
1509 curl_easy_strerror(results->curl_result),
1510 sizeof(curl_errorstr));
1511 #endif
1512 return HTTP_ERROR;
1513 }
1514 }
1515
1516 int run_one_slot(struct active_request_slot *slot,
1517 struct slot_results *results)
1518 {
1519 slot->results = results;
1520 if (!start_active_slot(slot)) {
1521 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1522 "failed to start HTTP request");
1523 return HTTP_START_FAILED;
1524 }
1525
1526 run_active_slot(slot);
1527 return handle_curl_result(results);
1528 }
1529
1530 struct curl_slist *http_copy_default_headers(void)
1531 {
1532 struct curl_slist *headers = NULL, *h;
1533
1534 for (h = extra_http_headers; h; h = h->next)
1535 headers = curl_slist_append(headers, h->data);
1536
1537 return headers;
1538 }
1539
1540 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1541 {
1542 char *ptr;
1543 CURLcode ret;
1544
1545 strbuf_reset(buf);
1546 ret = curl_easy_getinfo(curl, info, &ptr);
1547 if (!ret && ptr)
1548 strbuf_addstr(buf, ptr);
1549 return ret;
1550 }
1551
1552 /*
1553 * Check for and extract a content-type parameter. "raw"
1554 * should be positioned at the start of the potential
1555 * parameter, with any whitespace already removed.
1556 *
1557 * "name" is the name of the parameter. The value is appended
1558 * to "out".
1559 */
1560 static int extract_param(const char *raw, const char *name,
1561 struct strbuf *out)
1562 {
1563 size_t len = strlen(name);
1564
1565 if (strncasecmp(raw, name, len))
1566 return -1;
1567 raw += len;
1568
1569 if (*raw != '=')
1570 return -1;
1571 raw++;
1572
1573 while (*raw && !isspace(*raw) && *raw != ';')
1574 strbuf_addch(out, *raw++);
1575 return 0;
1576 }
1577
1578 /*
1579 * Extract a normalized version of the content type, with any
1580 * spaces suppressed, all letters lowercased, and no trailing ";"
1581 * or parameters.
1582 *
1583 * Note that we will silently remove even invalid whitespace. For
1584 * example, "text / plain" is specifically forbidden by RFC 2616,
1585 * but "text/plain" is the only reasonable output, and this keeps
1586 * our code simple.
1587 *
1588 * If the "charset" argument is not NULL, store the value of any
1589 * charset parameter there.
1590 *
1591 * Example:
1592 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1593 * "text / plain" -> "text/plain"
1594 */
1595 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1596 struct strbuf *charset)
1597 {
1598 const char *p;
1599
1600 strbuf_reset(type);
1601 strbuf_grow(type, raw->len);
1602 for (p = raw->buf; *p; p++) {
1603 if (isspace(*p))
1604 continue;
1605 if (*p == ';') {
1606 p++;
1607 break;
1608 }
1609 strbuf_addch(type, tolower(*p));
1610 }
1611
1612 if (!charset)
1613 return;
1614
1615 strbuf_reset(charset);
1616 while (*p) {
1617 while (isspace(*p) || *p == ';')
1618 p++;
1619 if (!extract_param(p, "charset", charset))
1620 return;
1621 while (*p && !isspace(*p))
1622 p++;
1623 }
1624
1625 if (!charset->len && starts_with(type->buf, "text/"))
1626 strbuf_addstr(charset, "ISO-8859-1");
1627 }
1628
1629 static void write_accept_language(struct strbuf *buf)
1630 {
1631 /*
1632 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1633 * that, q-value will be smaller than 0.001, the minimum q-value the
1634 * HTTP specification allows. See
1635 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1636 */
1637 const int MAX_DECIMAL_PLACES = 3;
1638 const int MAX_LANGUAGE_TAGS = 1000;
1639 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1640 char **language_tags = NULL;
1641 int num_langs = 0;
1642 const char *s = get_preferred_languages();
1643 int i;
1644 struct strbuf tag = STRBUF_INIT;
1645
1646 /* Don't add Accept-Language header if no language is preferred. */
1647 if (!s)
1648 return;
1649
1650 /*
1651 * Split the colon-separated string of preferred languages into
1652 * language_tags array.
1653 */
1654 do {
1655 /* collect language tag */
1656 for (; *s && (isalnum(*s) || *s == '_'); s++)
1657 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1658
1659 /* skip .codeset, @modifier and any other unnecessary parts */
1660 while (*s && *s != ':')
1661 s++;
1662
1663 if (tag.len) {
1664 num_langs++;
1665 REALLOC_ARRAY(language_tags, num_langs);
1666 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1667 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1668 break;
1669 }
1670 } while (*s++);
1671
1672 /* write Accept-Language header into buf */
1673 if (num_langs) {
1674 int last_buf_len = 0;
1675 int max_q;
1676 int decimal_places;
1677 char q_format[32];
1678
1679 /* add '*' */
1680 REALLOC_ARRAY(language_tags, num_langs + 1);
1681 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1682
1683 /* compute decimal_places */
1684 for (max_q = 1, decimal_places = 0;
1685 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1686 decimal_places++, max_q *= 10)
1687 ;
1688
1689 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1690
1691 strbuf_addstr(buf, "Accept-Language: ");
1692
1693 for (i = 0; i < num_langs; i++) {
1694 if (i > 0)
1695 strbuf_addstr(buf, ", ");
1696
1697 strbuf_addstr(buf, language_tags[i]);
1698
1699 if (i > 0)
1700 strbuf_addf(buf, q_format, max_q - i);
1701
1702 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1703 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1704 break;
1705 }
1706
1707 last_buf_len = buf->len;
1708 }
1709 }
1710
1711 /* free language tags -- last one is a static '*' */
1712 for (i = 0; i < num_langs - 1; i++)
1713 free(language_tags[i]);
1714 free(language_tags);
1715 }
1716
1717 /*
1718 * Get an Accept-Language header which indicates user's preferred languages.
1719 *
1720 * Examples:
1721 * LANGUAGE= -> ""
1722 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1723 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1724 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1725 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1726 * LANGUAGE= LANG=C -> ""
1727 */
1728 static const char *get_accept_language(void)
1729 {
1730 if (!cached_accept_language) {
1731 struct strbuf buf = STRBUF_INIT;
1732 write_accept_language(&buf);
1733 if (buf.len > 0)
1734 cached_accept_language = strbuf_detach(&buf, NULL);
1735 }
1736
1737 return cached_accept_language;
1738 }
1739
1740 static void http_opt_request_remainder(CURL *curl, off_t pos)
1741 {
1742 char buf[128];
1743 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1744 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1745 }
1746
1747 /* http_request() targets */
1748 #define HTTP_REQUEST_STRBUF 0
1749 #define HTTP_REQUEST_FILE 1
1750
1751 static int http_request(const char *url,
1752 void *result, int target,
1753 const struct http_get_options *options)
1754 {
1755 struct active_request_slot *slot;
1756 struct slot_results results;
1757 struct curl_slist *headers = http_copy_default_headers();
1758 struct strbuf buf = STRBUF_INIT;
1759 const char *accept_language;
1760 int ret;
1761
1762 slot = get_active_slot();
1763 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1764
1765 if (result == NULL) {
1766 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1767 } else {
1768 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1769 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1770
1771 if (target == HTTP_REQUEST_FILE) {
1772 off_t posn = ftello(result);
1773 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1774 fwrite);
1775 if (posn > 0)
1776 http_opt_request_remainder(slot->curl, posn);
1777 } else
1778 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1779 fwrite_buffer);
1780 }
1781
1782 accept_language = get_accept_language();
1783
1784 if (accept_language)
1785 headers = curl_slist_append(headers, accept_language);
1786
1787 strbuf_addstr(&buf, "Pragma:");
1788 if (options && options->no_cache)
1789 strbuf_addstr(&buf, " no-cache");
1790 if (options && options->keep_error)
1791 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1792 if (options && options->initial_request &&
1793 http_follow_config == HTTP_FOLLOW_INITIAL)
1794 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1795
1796 headers = curl_slist_append(headers, buf.buf);
1797
1798 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1799 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1800 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1801
1802 ret = run_one_slot(slot, &results);
1803
1804 if (options && options->content_type) {
1805 struct strbuf raw = STRBUF_INIT;
1806 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1807 extract_content_type(&raw, options->content_type,
1808 options->charset);
1809 strbuf_release(&raw);
1810 }
1811
1812 if (options && options->effective_url)
1813 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1814 options->effective_url);
1815
1816 curl_slist_free_all(headers);
1817 strbuf_release(&buf);
1818
1819 return ret;
1820 }
1821
1822 /*
1823 * Update the "base" url to a more appropriate value, as deduced by
1824 * redirects seen when requesting a URL starting with "url".
1825 *
1826 * The "asked" parameter is a URL that we asked curl to access, and must begin
1827 * with "base".
1828 *
1829 * The "got" parameter is the URL that curl reported to us as where we ended
1830 * up.
1831 *
1832 * Returns 1 if we updated the base url, 0 otherwise.
1833 *
1834 * Our basic strategy is to compare "base" and "asked" to find the bits
1835 * specific to our request. We then strip those bits off of "got" to yield the
1836 * new base. So for example, if our base is "http://example.com/foo.git",
1837 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1838 * with "https://other.example.com/foo.git/info/refs". We would want the
1839 * new URL to become "https://other.example.com/foo.git".
1840 *
1841 * Note that this assumes a sane redirect scheme. It's entirely possible
1842 * in the example above to end up at a URL that does not even end in
1843 * "info/refs". In such a case we die. There's not much we can do, such a
1844 * scheme is unlikely to represent a real git repository, and failing to
1845 * rewrite the base opens options for malicious redirects to do funny things.
1846 */
1847 static int update_url_from_redirect(struct strbuf *base,
1848 const char *asked,
1849 const struct strbuf *got)
1850 {
1851 const char *tail;
1852 size_t new_len;
1853
1854 if (!strcmp(asked, got->buf))
1855 return 0;
1856
1857 if (!skip_prefix(asked, base->buf, &tail))
1858 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1859 asked, base->buf);
1860
1861 new_len = got->len;
1862 if (!strip_suffix_mem(got->buf, &new_len, tail))
1863 die(_("unable to update url base from redirection:\n"
1864 " asked for: %s\n"
1865 " redirect: %s"),
1866 asked, got->buf);
1867
1868 strbuf_reset(base);
1869 strbuf_add(base, got->buf, new_len);
1870
1871 return 1;
1872 }
1873
1874 static int http_request_reauth(const char *url,
1875 void *result, int target,
1876 struct http_get_options *options)
1877 {
1878 int ret = http_request(url, result, target, options);
1879
1880 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1881 return ret;
1882
1883 if (options && options->effective_url && options->base_url) {
1884 if (update_url_from_redirect(options->base_url,
1885 url, options->effective_url)) {
1886 credential_from_url(&http_auth, options->base_url->buf);
1887 url = options->effective_url->buf;
1888 }
1889 }
1890
1891 if (ret != HTTP_REAUTH)
1892 return ret;
1893
1894 /*
1895 * If we are using KEEP_ERROR, the previous request may have
1896 * put cruft into our output stream; we should clear it out before
1897 * making our next request. We only know how to do this for
1898 * the strbuf case, but that is enough to satisfy current callers.
1899 */
1900 if (options && options->keep_error) {
1901 switch (target) {
1902 case HTTP_REQUEST_STRBUF:
1903 strbuf_reset(result);
1904 break;
1905 default:
1906 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1907 }
1908 }
1909
1910 credential_fill(&http_auth);
1911
1912 return http_request(url, result, target, options);
1913 }
1914
1915 int http_get_strbuf(const char *url,
1916 struct strbuf *result,
1917 struct http_get_options *options)
1918 {
1919 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1920 }
1921
1922 /*
1923 * Downloads a URL and stores the result in the given file.
1924 *
1925 * If a previous interrupted download is detected (i.e. a previous temporary
1926 * file is still around) the download is resumed.
1927 */
1928 static int http_get_file(const char *url, const char *filename,
1929 struct http_get_options *options)
1930 {
1931 int ret;
1932 struct strbuf tmpfile = STRBUF_INIT;
1933 FILE *result;
1934
1935 strbuf_addf(&tmpfile, "%s.temp", filename);
1936 result = fopen(tmpfile.buf, "a");
1937 if (!result) {
1938 error("Unable to open local file %s", tmpfile.buf);
1939 ret = HTTP_ERROR;
1940 goto cleanup;
1941 }
1942
1943 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1944 fclose(result);
1945
1946 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1947 ret = HTTP_ERROR;
1948 cleanup:
1949 strbuf_release(&tmpfile);
1950 return ret;
1951 }
1952
1953 int http_fetch_ref(const char *base, struct ref *ref)
1954 {
1955 struct http_get_options options = {0};
1956 char *url;
1957 struct strbuf buffer = STRBUF_INIT;
1958 int ret = -1;
1959
1960 options.no_cache = 1;
1961
1962 url = quote_ref_url(base, ref->name);
1963 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1964 strbuf_rtrim(&buffer);
1965 if (buffer.len == 40)
1966 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1967 else if (starts_with(buffer.buf, "ref: ")) {
1968 ref->symref = xstrdup(buffer.buf + 5);
1969 ret = 0;
1970 }
1971 }
1972
1973 strbuf_release(&buffer);
1974 free(url);
1975 return ret;
1976 }
1977
1978 /* Helpers for fetching packs */
1979 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1980 {
1981 char *url, *tmp;
1982 struct strbuf buf = STRBUF_INIT;
1983
1984 if (http_is_verbose)
1985 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1986
1987 end_url_with_slash(&buf, base_url);
1988 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1989 url = strbuf_detach(&buf, NULL);
1990
1991 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1992 tmp = strbuf_detach(&buf, NULL);
1993
1994 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1995 error("Unable to get pack index %s", url);
1996 FREE_AND_NULL(tmp);
1997 }
1998
1999 free(url);
2000 return tmp;
2001 }
2002
2003 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2004 unsigned char *sha1, const char *base_url)
2005 {
2006 struct packed_git *new_pack;
2007 char *tmp_idx = NULL;
2008 int ret;
2009
2010 if (has_pack_index(sha1)) {
2011 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2012 if (!new_pack)
2013 return -1; /* parse_pack_index() already issued error message */
2014 goto add_pack;
2015 }
2016
2017 tmp_idx = fetch_pack_index(sha1, base_url);
2018 if (!tmp_idx)
2019 return -1;
2020
2021 new_pack = parse_pack_index(sha1, tmp_idx);
2022 if (!new_pack) {
2023 unlink(tmp_idx);
2024 free(tmp_idx);
2025
2026 return -1; /* parse_pack_index() already issued error message */
2027 }
2028
2029 ret = verify_pack_index(new_pack);
2030 if (!ret) {
2031 close_pack_index(new_pack);
2032 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2033 }
2034 free(tmp_idx);
2035 if (ret)
2036 return -1;
2037
2038 add_pack:
2039 new_pack->next = *packs_head;
2040 *packs_head = new_pack;
2041 return 0;
2042 }
2043
2044 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2045 {
2046 struct http_get_options options = {0};
2047 int ret = 0, i = 0;
2048 char *url, *data;
2049 struct strbuf buf = STRBUF_INIT;
2050 unsigned char sha1[20];
2051
2052 end_url_with_slash(&buf, base_url);
2053 strbuf_addstr(&buf, "objects/info/packs");
2054 url = strbuf_detach(&buf, NULL);
2055
2056 options.no_cache = 1;
2057 ret = http_get_strbuf(url, &buf, &options);
2058 if (ret != HTTP_OK)
2059 goto cleanup;
2060
2061 data = buf.buf;
2062 while (i < buf.len) {
2063 switch (data[i]) {
2064 case 'P':
2065 i++;
2066 if (i + 52 <= buf.len &&
2067 starts_with(data + i, " pack-") &&
2068 starts_with(data + i + 46, ".pack\n")) {
2069 get_sha1_hex(data + i + 6, sha1);
2070 fetch_and_setup_pack_index(packs_head, sha1,
2071 base_url);
2072 i += 51;
2073 break;
2074 }
2075 default:
2076 while (i < buf.len && data[i] != '\n')
2077 i++;
2078 }
2079 i++;
2080 }
2081
2082 cleanup:
2083 free(url);
2084 return ret;
2085 }
2086
2087 void release_http_pack_request(struct http_pack_request *preq)
2088 {
2089 if (preq->packfile != NULL) {
2090 fclose(preq->packfile);
2091 preq->packfile = NULL;
2092 }
2093 preq->slot = NULL;
2094 free(preq->url);
2095 free(preq);
2096 }
2097
2098 int finish_http_pack_request(struct http_pack_request *preq)
2099 {
2100 struct packed_git **lst;
2101 struct packed_git *p = preq->target;
2102 char *tmp_idx;
2103 size_t len;
2104 struct child_process ip = CHILD_PROCESS_INIT;
2105
2106 close_pack_index(p);
2107
2108 fclose(preq->packfile);
2109 preq->packfile = NULL;
2110
2111 lst = preq->lst;
2112 while (*lst != p)
2113 lst = &((*lst)->next);
2114 *lst = (*lst)->next;
2115
2116 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2117 die("BUG: pack tmpfile does not end in .pack.temp?");
2118 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2119
2120 argv_array_push(&ip.args, "index-pack");
2121 argv_array_pushl(&ip.args, "-o", tmp_idx, NULL);
2122 argv_array_push(&ip.args, preq->tmpfile);
2123 ip.git_cmd = 1;
2124 ip.no_stdin = 1;
2125 ip.no_stdout = 1;
2126
2127 if (run_command(&ip)) {
2128 unlink(preq->tmpfile);
2129 unlink(tmp_idx);
2130 free(tmp_idx);
2131 return -1;
2132 }
2133
2134 unlink(sha1_pack_index_name(p->sha1));
2135
2136 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2137 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2138 free(tmp_idx);
2139 return -1;
2140 }
2141
2142 install_packed_git(the_repository, p);
2143 free(tmp_idx);
2144 return 0;
2145 }
2146
2147 struct http_pack_request *new_http_pack_request(
2148 struct packed_git *target, const char *base_url)
2149 {
2150 off_t prev_posn = 0;
2151 struct strbuf buf = STRBUF_INIT;
2152 struct http_pack_request *preq;
2153
2154 preq = xcalloc(1, sizeof(*preq));
2155 preq->target = target;
2156
2157 end_url_with_slash(&buf, base_url);
2158 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2159 sha1_to_hex(target->sha1));
2160 preq->url = strbuf_detach(&buf, NULL);
2161
2162 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2163 sha1_pack_name(target->sha1));
2164 preq->packfile = fopen(preq->tmpfile, "a");
2165 if (!preq->packfile) {
2166 error("Unable to open local file %s for pack",
2167 preq->tmpfile);
2168 goto abort;
2169 }
2170
2171 preq->slot = get_active_slot();
2172 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2173 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2174 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2175 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2176 no_pragma_header);
2177
2178 /*
2179 * If there is data present from a previous transfer attempt,
2180 * resume where it left off
2181 */
2182 prev_posn = ftello(preq->packfile);
2183 if (prev_posn>0) {
2184 if (http_is_verbose)
2185 fprintf(stderr,
2186 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2187 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2188 http_opt_request_remainder(preq->slot->curl, prev_posn);
2189 }
2190
2191 return preq;
2192
2193 abort:
2194 free(preq->url);
2195 free(preq);
2196 return NULL;
2197 }
2198
2199 /* Helpers for fetching objects (loose) */
2200 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2201 void *data)
2202 {
2203 unsigned char expn[4096];
2204 size_t size = eltsize * nmemb;
2205 int posn = 0;
2206 struct http_object_request *freq = data;
2207 struct active_request_slot *slot = freq->slot;
2208
2209 if (slot) {
2210 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2211 &slot->http_code);
2212 if (c != CURLE_OK)
2213 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2214 curl_easy_strerror(c));
2215 if (slot->http_code >= 300)
2216 return size;
2217 }
2218
2219 do {
2220 ssize_t retval = xwrite(freq->localfile,
2221 (char *) ptr + posn, size - posn);
2222 if (retval < 0)
2223 return posn;
2224 posn += retval;
2225 } while (posn < size);
2226
2227 freq->stream.avail_in = size;
2228 freq->stream.next_in = (void *)ptr;
2229 do {
2230 freq->stream.next_out = expn;
2231 freq->stream.avail_out = sizeof(expn);
2232 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2233 git_SHA1_Update(&freq->c, expn,
2234 sizeof(expn) - freq->stream.avail_out);
2235 } while (freq->stream.avail_in && freq->zret == Z_OK);
2236 return size;
2237 }
2238
2239 struct http_object_request *new_http_object_request(const char *base_url,
2240 unsigned char *sha1)
2241 {
2242 char *hex = sha1_to_hex(sha1);
2243 struct strbuf filename = STRBUF_INIT;
2244 char prevfile[PATH_MAX];
2245 int prevlocal;
2246 char prev_buf[PREV_BUF_SIZE];
2247 ssize_t prev_read = 0;
2248 off_t prev_posn = 0;
2249 struct http_object_request *freq;
2250
2251 freq = xcalloc(1, sizeof(*freq));
2252 hashcpy(freq->sha1, sha1);
2253 freq->localfile = -1;
2254
2255 sha1_file_name(the_repository, &filename, sha1);
2256 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2257 "%s.temp", filename.buf);
2258
2259 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename.buf);
2260 unlink_or_warn(prevfile);
2261 rename(freq->tmpfile, prevfile);
2262 unlink_or_warn(freq->tmpfile);
2263 strbuf_release(&filename);
2264
2265 if (freq->localfile != -1)
2266 error("fd leakage in start: %d", freq->localfile);
2267 freq->localfile = open(freq->tmpfile,
2268 O_WRONLY | O_CREAT | O_EXCL, 0666);
2269 /*
2270 * This could have failed due to the "lazy directory creation";
2271 * try to mkdir the last path component.
2272 */
2273 if (freq->localfile < 0 && errno == ENOENT) {
2274 char *dir = strrchr(freq->tmpfile, '/');
2275 if (dir) {
2276 *dir = 0;
2277 mkdir(freq->tmpfile, 0777);
2278 *dir = '/';
2279 }
2280 freq->localfile = open(freq->tmpfile,
2281 O_WRONLY | O_CREAT | O_EXCL, 0666);
2282 }
2283
2284 if (freq->localfile < 0) {
2285 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2286 goto abort;
2287 }
2288
2289 git_inflate_init(&freq->stream);
2290
2291 git_SHA1_Init(&freq->c);
2292
2293 freq->url = get_remote_object_url(base_url, hex, 0);
2294
2295 /*
2296 * If a previous temp file is present, process what was already
2297 * fetched.
2298 */
2299 prevlocal = open(prevfile, O_RDONLY);
2300 if (prevlocal != -1) {
2301 do {
2302 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2303 if (prev_read>0) {
2304 if (fwrite_sha1_file(prev_buf,
2305 1,
2306 prev_read,
2307 freq) == prev_read) {
2308 prev_posn += prev_read;
2309 } else {
2310 prev_read = -1;
2311 }
2312 }
2313 } while (prev_read > 0);
2314 close(prevlocal);
2315 }
2316 unlink_or_warn(prevfile);
2317
2318 /*
2319 * Reset inflate/SHA1 if there was an error reading the previous temp
2320 * file; also rewind to the beginning of the local file.
2321 */
2322 if (prev_read == -1) {
2323 memset(&freq->stream, 0, sizeof(freq->stream));
2324 git_inflate_init(&freq->stream);
2325 git_SHA1_Init(&freq->c);
2326 if (prev_posn>0) {
2327 prev_posn = 0;
2328 lseek(freq->localfile, 0, SEEK_SET);
2329 if (ftruncate(freq->localfile, 0) < 0) {
2330 error_errno("Couldn't truncate temporary file %s",
2331 freq->tmpfile);
2332 goto abort;
2333 }
2334 }
2335 }
2336
2337 freq->slot = get_active_slot();
2338
2339 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2340 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2341 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2342 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2343 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2344 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2345
2346 /*
2347 * If we have successfully processed data from a previous fetch
2348 * attempt, only fetch the data we don't already have.
2349 */
2350 if (prev_posn>0) {
2351 if (http_is_verbose)
2352 fprintf(stderr,
2353 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2354 hex, (uintmax_t)prev_posn);
2355 http_opt_request_remainder(freq->slot->curl, prev_posn);
2356 }
2357
2358 return freq;
2359
2360 abort:
2361 free(freq->url);
2362 free(freq);
2363 return NULL;
2364 }
2365
2366 void process_http_object_request(struct http_object_request *freq)
2367 {
2368 if (freq->slot == NULL)
2369 return;
2370 freq->curl_result = freq->slot->curl_result;
2371 freq->http_code = freq->slot->http_code;
2372 freq->slot = NULL;
2373 }
2374
2375 int finish_http_object_request(struct http_object_request *freq)
2376 {
2377 struct stat st;
2378 struct strbuf filename = STRBUF_INIT;
2379
2380 close(freq->localfile);
2381 freq->localfile = -1;
2382
2383 process_http_object_request(freq);
2384
2385 if (freq->http_code == 416) {
2386 warning("requested range invalid; we may already have all the data.");
2387 } else if (freq->curl_result != CURLE_OK) {
2388 if (stat(freq->tmpfile, &st) == 0)
2389 if (st.st_size == 0)
2390 unlink_or_warn(freq->tmpfile);
2391 return -1;
2392 }
2393
2394 git_inflate_end(&freq->stream);
2395 git_SHA1_Final(freq->real_sha1, &freq->c);
2396 if (freq->zret != Z_STREAM_END) {
2397 unlink_or_warn(freq->tmpfile);
2398 return -1;
2399 }
2400 if (hashcmp(freq->sha1, freq->real_sha1)) {
2401 unlink_or_warn(freq->tmpfile);
2402 return -1;
2403 }
2404 sha1_file_name(the_repository, &filename, freq->sha1);
2405 freq->rename = finalize_object_file(freq->tmpfile, filename.buf);
2406 strbuf_release(&filename);
2407
2408 return freq->rename;
2409 }
2410
2411 void abort_http_object_request(struct http_object_request *freq)
2412 {
2413 unlink_or_warn(freq->tmpfile);
2414
2415 release_http_object_request(freq);
2416 }
2417
2418 void release_http_object_request(struct http_object_request *freq)
2419 {
2420 if (freq->localfile != -1) {
2421 close(freq->localfile);
2422 freq->localfile = -1;
2423 }
2424 if (freq->url != NULL) {
2425 FREE_AND_NULL(freq->url);
2426 }
2427 if (freq->slot != NULL) {
2428 freq->slot->callback_func = NULL;
2429 freq->slot->callback_data = NULL;
2430 release_active_slot(freq->slot);
2431 freq->slot = NULL;
2432 }
2433 }
git for Debian