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