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doc: clarify "config --bool" behaviour with empty string
[alt-git.git] / http.c
blob051fe6e5ab77a5dc6e53dce7011d0fc445f15ab0
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
15 #if LIBCURL_VERSION_NUM >= 0x070a08
16 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
17 #else
18 long int git_curl_ipresolve;
19 #endif
20 int active_requests;
21 int http_is_verbose;
22 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
23
24 #if LIBCURL_VERSION_NUM >= 0x070a06
25 #define LIBCURL_CAN_HANDLE_AUTH_ANY
26 #endif
27
28 static int min_curl_sessions = 1;
29 static int curl_session_count;
30 #ifdef USE_CURL_MULTI
31 static int max_requests = -1;
32 static CURLM *curlm;
33 #endif
34 #ifndef NO_CURL_EASY_DUPHANDLE
35 static CURL *curl_default;
36 #endif
37
38 #define PREV_BUF_SIZE 4096
39
40 char curl_errorstr[CURL_ERROR_SIZE];
41
42 static int curl_ssl_verify = -1;
43 static int curl_ssl_try;
44 static const char *ssl_cert;
45 static const char *ssl_cipherlist;
46 static const char *ssl_version;
47 static struct {
48 const char *name;
49 long ssl_version;
50 } sslversions[] = {
51 { "sslv2", CURL_SSLVERSION_SSLv2 },
52 { "sslv3", CURL_SSLVERSION_SSLv3 },
53 { "tlsv1", CURL_SSLVERSION_TLSv1 },
54 #if LIBCURL_VERSION_NUM >= 0x072200
55 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
56 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
57 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
58 #endif
59 };
60 #if LIBCURL_VERSION_NUM >= 0x070903
61 static const char *ssl_key;
62 #endif
63 #if LIBCURL_VERSION_NUM >= 0x070908
64 static const char *ssl_capath;
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x072c00
67 static const char *ssl_pinnedkey;
68 #endif
69 static const char *ssl_cainfo;
70 static long curl_low_speed_limit = -1;
71 static long curl_low_speed_time = -1;
72 static int curl_ftp_no_epsv;
73 static const char *curl_http_proxy;
74 static const char *curl_no_proxy;
75 static const char *http_proxy_authmethod;
76 static struct {
77 const char *name;
78 long curlauth_param;
79 } proxy_authmethods[] = {
80 { "basic", CURLAUTH_BASIC },
81 { "digest", CURLAUTH_DIGEST },
82 { "negotiate", CURLAUTH_GSSNEGOTIATE },
83 { "ntlm", CURLAUTH_NTLM },
84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
85 { "anyauth", CURLAUTH_ANY },
86 #endif
87 /*
88 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
89 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
90 * here, too
91 */
92 };
93 #if LIBCURL_VERSION_NUM >= 0x071600
94 static const char *curl_deleg;
95 static struct {
96 const char *name;
97 long curl_deleg_param;
98 } curl_deleg_levels[] = {
99 { "none", CURLGSSAPI_DELEGATION_NONE },
100 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
101 { "always", CURLGSSAPI_DELEGATION_FLAG },
102 };
103 #endif
104
105 static struct credential proxy_auth = CREDENTIAL_INIT;
106 static const char *curl_proxyuserpwd;
107 static const char *curl_cookie_file;
108 static int curl_save_cookies;
109 struct credential http_auth = CREDENTIAL_INIT;
110 static int http_proactive_auth;
111 static const char *user_agent;
112 static int curl_empty_auth;
113
114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
115
116 #if LIBCURL_VERSION_NUM >= 0x071700
117 /* Use CURLOPT_KEYPASSWD as is */
118 #elif LIBCURL_VERSION_NUM >= 0x070903
119 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
120 #else
121 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
122 #endif
123
124 static struct credential cert_auth = CREDENTIAL_INIT;
125 static int ssl_cert_password_required;
126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
127 static unsigned long http_auth_methods = CURLAUTH_ANY;
128 #endif
129
130 static struct curl_slist *pragma_header;
131 static struct curl_slist *no_pragma_header;
132 static struct curl_slist *extra_http_headers;
133
134 static struct active_request_slot *active_queue_head;
135
136 static char *cached_accept_language;
137
138 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
139 {
140 size_t size = eltsize * nmemb;
141 struct buffer *buffer = buffer_;
142
143 if (size > buffer->buf.len - buffer->posn)
144 size = buffer->buf.len - buffer->posn;
145 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
146 buffer->posn += size;
147
148 return size;
149 }
150
151 #ifndef NO_CURL_IOCTL
152 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
153 {
154 struct buffer *buffer = clientp;
155
156 switch (cmd) {
157 case CURLIOCMD_NOP:
158 return CURLIOE_OK;
159
160 case CURLIOCMD_RESTARTREAD:
161 buffer->posn = 0;
162 return CURLIOE_OK;
163
164 default:
165 return CURLIOE_UNKNOWNCMD;
166 }
167 }
168 #endif
169
170 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
171 {
172 size_t size = eltsize * nmemb;
173 struct strbuf *buffer = buffer_;
174
175 strbuf_add(buffer, ptr, size);
176 return size;
177 }
178
179 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
180 {
181 return eltsize * nmemb;
182 }
183
184 static void closedown_active_slot(struct active_request_slot *slot)
185 {
186 active_requests--;
187 slot->in_use = 0;
188 }
189
190 static void finish_active_slot(struct active_request_slot *slot)
191 {
192 closedown_active_slot(slot);
193 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
194
195 if (slot->finished != NULL)
196 (*slot->finished) = 1;
197
198 /* Store slot results so they can be read after the slot is reused */
199 if (slot->results != NULL) {
200 slot->results->curl_result = slot->curl_result;
201 slot->results->http_code = slot->http_code;
202 #if LIBCURL_VERSION_NUM >= 0x070a08
203 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
204 &slot->results->auth_avail);
205 #else
206 slot->results->auth_avail = 0;
207 #endif
208
209 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
210 &slot->results->http_connectcode);
211 }
212
213 /* Run callback if appropriate */
214 if (slot->callback_func != NULL)
215 slot->callback_func(slot->callback_data);
216 }
217
218 static void xmulti_remove_handle(struct active_request_slot *slot)
219 {
220 #ifdef USE_CURL_MULTI
221 curl_multi_remove_handle(curlm, slot->curl);
222 #endif
223 }
224
225 #ifdef USE_CURL_MULTI
226 static void process_curl_messages(void)
227 {
228 int num_messages;
229 struct active_request_slot *slot;
230 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
231
232 while (curl_message != NULL) {
233 if (curl_message->msg == CURLMSG_DONE) {
234 int curl_result = curl_message->data.result;
235 slot = active_queue_head;
236 while (slot != NULL &&
237 slot->curl != curl_message->easy_handle)
238 slot = slot->next;
239 if (slot != NULL) {
240 xmulti_remove_handle(slot);
241 slot->curl_result = curl_result;
242 finish_active_slot(slot);
243 } else {
244 fprintf(stderr, "Received DONE message for unknown request!\n");
245 }
246 } else {
247 fprintf(stderr, "Unknown CURL message received: %d\n",
248 (int)curl_message->msg);
249 }
250 curl_message = curl_multi_info_read(curlm, &num_messages);
251 }
252 }
253 #endif
254
255 static int http_options(const char *var, const char *value, void *cb)
256 {
257 if (!strcmp("http.sslverify", var)) {
258 curl_ssl_verify = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp("http.sslcipherlist", var))
262 return git_config_string(&ssl_cipherlist, var, value);
263 if (!strcmp("http.sslversion", var))
264 return git_config_string(&ssl_version, var, value);
265 if (!strcmp("http.sslcert", var))
266 return git_config_string(&ssl_cert, var, value);
267 #if LIBCURL_VERSION_NUM >= 0x070903
268 if (!strcmp("http.sslkey", var))
269 return git_config_string(&ssl_key, var, value);
270 #endif
271 #if LIBCURL_VERSION_NUM >= 0x070908
272 if (!strcmp("http.sslcapath", var))
273 return git_config_pathname(&ssl_capath, var, value);
274 #endif
275 if (!strcmp("http.sslcainfo", var))
276 return git_config_pathname(&ssl_cainfo, var, value);
277 if (!strcmp("http.sslcertpasswordprotected", var)) {
278 ssl_cert_password_required = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp("http.ssltry", var)) {
282 curl_ssl_try = git_config_bool(var, value);
283 return 0;
284 }
285 if (!strcmp("http.minsessions", var)) {
286 min_curl_sessions = git_config_int(var, value);
287 #ifndef USE_CURL_MULTI
288 if (min_curl_sessions > 1)
289 min_curl_sessions = 1;
290 #endif
291 return 0;
292 }
293 #ifdef USE_CURL_MULTI
294 if (!strcmp("http.maxrequests", var)) {
295 max_requests = git_config_int(var, value);
296 return 0;
297 }
298 #endif
299 if (!strcmp("http.lowspeedlimit", var)) {
300 curl_low_speed_limit = (long)git_config_int(var, value);
301 return 0;
302 }
303 if (!strcmp("http.lowspeedtime", var)) {
304 curl_low_speed_time = (long)git_config_int(var, value);
305 return 0;
306 }
307
308 if (!strcmp("http.noepsv", var)) {
309 curl_ftp_no_epsv = git_config_bool(var, value);
310 return 0;
311 }
312 if (!strcmp("http.proxy", var))
313 return git_config_string(&curl_http_proxy, var, value);
314
315 if (!strcmp("http.proxyauthmethod", var))
316 return git_config_string(&http_proxy_authmethod, var, value);
317
318 if (!strcmp("http.cookiefile", var))
319 return git_config_pathname(&curl_cookie_file, var, value);
320 if (!strcmp("http.savecookies", var)) {
321 curl_save_cookies = git_config_bool(var, value);
322 return 0;
323 }
324
325 if (!strcmp("http.postbuffer", var)) {
326 http_post_buffer = git_config_int(var, value);
327 if (http_post_buffer < LARGE_PACKET_MAX)
328 http_post_buffer = LARGE_PACKET_MAX;
329 return 0;
330 }
331
332 if (!strcmp("http.useragent", var))
333 return git_config_string(&user_agent, var, value);
334
335 if (!strcmp("http.emptyauth", var)) {
336 curl_empty_auth = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp("http.delegation", var)) {
341 #if LIBCURL_VERSION_NUM >= 0x071600
342 return git_config_string(&curl_deleg, var, value);
343 #else
344 warning(_("Delegation control is not supported with cURL < 7.22.0"));
345 return 0;
346 #endif
347 }
348
349 if (!strcmp("http.pinnedpubkey", var)) {
350 #if LIBCURL_VERSION_NUM >= 0x072c00
351 return git_config_pathname(&ssl_pinnedkey, var, value);
352 #else
353 warning(_("Public key pinning not supported with cURL < 7.44.0"));
354 return 0;
355 #endif
356 }
357
358 if (!strcmp("http.extraheader", var)) {
359 if (!value) {
360 return config_error_nonbool(var);
361 } else if (!*value) {
362 curl_slist_free_all(extra_http_headers);
363 extra_http_headers = NULL;
364 } else {
365 extra_http_headers =
366 curl_slist_append(extra_http_headers, value);
367 }
368 return 0;
369 }
370
371 if (!strcmp("http.followredirects", var)) {
372 if (value && !strcmp(value, "initial"))
373 http_follow_config = HTTP_FOLLOW_INITIAL;
374 else if (git_config_bool(var, value))
375 http_follow_config = HTTP_FOLLOW_ALWAYS;
376 else
377 http_follow_config = HTTP_FOLLOW_NONE;
378 return 0;
379 }
380
381 /* Fall back on the default ones */
382 return git_default_config(var, value, cb);
383 }
384
385 static void init_curl_http_auth(CURL *result)
386 {
387 if (!http_auth.username || !*http_auth.username) {
388 if (curl_empty_auth)
389 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
390 return;
391 }
392
393 credential_fill(&http_auth);
394
395 #if LIBCURL_VERSION_NUM >= 0x071301
396 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
397 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
398 #else
399 {
400 static struct strbuf up = STRBUF_INIT;
401 /*
402 * Note that we assume we only ever have a single set of
403 * credentials in a given program run, so we do not have
404 * to worry about updating this buffer, only setting its
405 * initial value.
406 */
407 if (!up.len)
408 strbuf_addf(&up, "%s:%s",
409 http_auth.username, http_auth.password);
410 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
411 }
412 #endif
413 }
414
415 /* *var must be free-able */
416 static void var_override(const char **var, char *value)
417 {
418 if (value) {
419 free((void *)*var);
420 *var = xstrdup(value);
421 }
422 }
423
424 static void set_proxyauth_name_password(CURL *result)
425 {
426 #if LIBCURL_VERSION_NUM >= 0x071301
427 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
428 proxy_auth.username);
429 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
430 proxy_auth.password);
431 #else
432 struct strbuf s = STRBUF_INIT;
433
434 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
435 strbuf_addch(&s, ':');
436 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
437 curl_proxyuserpwd = strbuf_detach(&s, NULL);
438 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
439 #endif
440 }
441
442 static void init_curl_proxy_auth(CURL *result)
443 {
444 if (proxy_auth.username) {
445 if (!proxy_auth.password)
446 credential_fill(&proxy_auth);
447 set_proxyauth_name_password(result);
448 }
449
450 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
451
452 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
453 if (http_proxy_authmethod) {
454 int i;
455 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
456 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
457 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
458 proxy_authmethods[i].curlauth_param);
459 break;
460 }
461 }
462 if (i == ARRAY_SIZE(proxy_authmethods)) {
463 warning("unsupported proxy authentication method %s: using anyauth",
464 http_proxy_authmethod);
465 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
466 }
467 }
468 else
469 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
470 #endif
471 }
472
473 static int has_cert_password(void)
474 {
475 if (ssl_cert == NULL || ssl_cert_password_required != 1)
476 return 0;
477 if (!cert_auth.password) {
478 cert_auth.protocol = xstrdup("cert");
479 cert_auth.username = xstrdup("");
480 cert_auth.path = xstrdup(ssl_cert);
481 credential_fill(&cert_auth);
482 }
483 return 1;
484 }
485
486 #if LIBCURL_VERSION_NUM >= 0x071900
487 static void set_curl_keepalive(CURL *c)
488 {
489 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
490 }
491
492 #elif LIBCURL_VERSION_NUM >= 0x071000
493 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
494 {
495 int ka = 1;
496 int rc;
497 socklen_t len = (socklen_t)sizeof(ka);
498
499 if (type != CURLSOCKTYPE_IPCXN)
500 return 0;
501
502 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
503 if (rc < 0)
504 warning_errno("unable to set SO_KEEPALIVE on socket");
505
506 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
507 }
508
509 static void set_curl_keepalive(CURL *c)
510 {
511 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
512 }
513
514 #else
515 static void set_curl_keepalive(CURL *c)
516 {
517 /* not supported on older curl versions */
518 }
519 #endif
520
521 static void redact_sensitive_header(struct strbuf *header)
522 {
523 const char *sensitive_header;
524
525 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
526 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
527 /* The first token is the type, which is OK to log */
528 while (isspace(*sensitive_header))
529 sensitive_header++;
530 while (*sensitive_header && !isspace(*sensitive_header))
531 sensitive_header++;
532 /* Everything else is opaque and possibly sensitive */
533 strbuf_setlen(header, sensitive_header - header->buf);
534 strbuf_addstr(header, " <redacted>");
535 }
536 }
537
538 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
539 {
540 struct strbuf out = STRBUF_INIT;
541 struct strbuf **headers, **header;
542
543 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
544 text, (long)size, (long)size);
545 trace_strbuf(&trace_curl, &out);
546 strbuf_reset(&out);
547 strbuf_add(&out, ptr, size);
548 headers = strbuf_split_max(&out, '\n', 0);
549
550 for (header = headers; *header; header++) {
551 if (hide_sensitive_header)
552 redact_sensitive_header(*header);
553 strbuf_insert((*header), 0, text, strlen(text));
554 strbuf_insert((*header), strlen(text), ": ", 2);
555 strbuf_rtrim((*header));
556 strbuf_addch((*header), '\n');
557 trace_strbuf(&trace_curl, (*header));
558 }
559 strbuf_list_free(headers);
560 strbuf_release(&out);
561 }
562
563 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
564 {
565 size_t i;
566 struct strbuf out = STRBUF_INIT;
567 unsigned int width = 60;
568
569 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
570 text, (long)size, (long)size);
571 trace_strbuf(&trace_curl, &out);
572
573 for (i = 0; i < size; i += width) {
574 size_t w;
575
576 strbuf_reset(&out);
577 strbuf_addf(&out, "%s: ", text);
578 for (w = 0; (w < width) && (i + w < size); w++) {
579 unsigned char ch = ptr[i + w];
580
581 strbuf_addch(&out,
582 (ch >= 0x20) && (ch < 0x80)
583 ? ch : '.');
584 }
585 strbuf_addch(&out, '\n');
586 trace_strbuf(&trace_curl, &out);
587 }
588 strbuf_release(&out);
589 }
590
591 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
592 {
593 const char *text;
594 enum { NO_FILTER = 0, DO_FILTER = 1 };
595
596 switch (type) {
597 case CURLINFO_TEXT:
598 trace_printf_key(&trace_curl, "== Info: %s", data);
599 default: /* we ignore unknown types by default */
600 return 0;
601
602 case CURLINFO_HEADER_OUT:
603 text = "=> Send header";
604 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
605 break;
606 case CURLINFO_DATA_OUT:
607 text = "=> Send data";
608 curl_dump_data(text, (unsigned char *)data, size);
609 break;
610 case CURLINFO_SSL_DATA_OUT:
611 text = "=> Send SSL data";
612 curl_dump_data(text, (unsigned char *)data, size);
613 break;
614 case CURLINFO_HEADER_IN:
615 text = "<= Recv header";
616 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
617 break;
618 case CURLINFO_DATA_IN:
619 text = "<= Recv data";
620 curl_dump_data(text, (unsigned char *)data, size);
621 break;
622 case CURLINFO_SSL_DATA_IN:
623 text = "<= Recv SSL data";
624 curl_dump_data(text, (unsigned char *)data, size);
625 break;
626 }
627 return 0;
628 }
629
630 void setup_curl_trace(CURL *handle)
631 {
632 if (!trace_want(&trace_curl))
633 return;
634 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
635 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
636 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
637 }
638
639
640 static CURL *get_curl_handle(void)
641 {
642 CURL *result = curl_easy_init();
643 long allowed_protocols = 0;
644
645 if (!result)
646 die("curl_easy_init failed");
647
648 if (!curl_ssl_verify) {
649 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
650 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
651 } else {
652 /* Verify authenticity of the peer's certificate */
653 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
654 /* The name in the cert must match whom we tried to connect */
655 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
656 }
657
658 #if LIBCURL_VERSION_NUM >= 0x070907
659 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
660 #endif
661 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
662 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
663 #endif
664
665 #if LIBCURL_VERSION_NUM >= 0x071600
666 if (curl_deleg) {
667 int i;
668 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
669 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
670 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
671 curl_deleg_levels[i].curl_deleg_param);
672 break;
673 }
674 }
675 if (i == ARRAY_SIZE(curl_deleg_levels))
676 warning("Unknown delegation method '%s': using default",
677 curl_deleg);
678 }
679 #endif
680
681 if (http_proactive_auth)
682 init_curl_http_auth(result);
683
684 if (getenv("GIT_SSL_VERSION"))
685 ssl_version = getenv("GIT_SSL_VERSION");
686 if (ssl_version && *ssl_version) {
687 int i;
688 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
689 if (!strcmp(ssl_version, sslversions[i].name)) {
690 curl_easy_setopt(result, CURLOPT_SSLVERSION,
691 sslversions[i].ssl_version);
692 break;
693 }
694 }
695 if (i == ARRAY_SIZE(sslversions))
696 warning("unsupported ssl version %s: using default",
697 ssl_version);
698 }
699
700 if (getenv("GIT_SSL_CIPHER_LIST"))
701 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
702 if (ssl_cipherlist != NULL && *ssl_cipherlist)
703 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
704 ssl_cipherlist);
705
706 if (ssl_cert != NULL)
707 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
708 if (has_cert_password())
709 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
710 #if LIBCURL_VERSION_NUM >= 0x070903
711 if (ssl_key != NULL)
712 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
713 #endif
714 #if LIBCURL_VERSION_NUM >= 0x070908
715 if (ssl_capath != NULL)
716 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
717 #endif
718 #if LIBCURL_VERSION_NUM >= 0x072c00
719 if (ssl_pinnedkey != NULL)
720 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
721 #endif
722 if (ssl_cainfo != NULL)
723 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
724
725 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
726 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
727 curl_low_speed_limit);
728 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
729 curl_low_speed_time);
730 }
731
732 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
733 #if LIBCURL_VERSION_NUM >= 0x071301
734 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
735 #elif LIBCURL_VERSION_NUM >= 0x071101
736 curl_easy_setopt(result, CURLOPT_POST301, 1);
737 #endif
738 #if LIBCURL_VERSION_NUM >= 0x071304
739 if (is_transport_allowed("http"))
740 allowed_protocols |= CURLPROTO_HTTP;
741 if (is_transport_allowed("https"))
742 allowed_protocols |= CURLPROTO_HTTPS;
743 if (is_transport_allowed("ftp"))
744 allowed_protocols |= CURLPROTO_FTP;
745 if (is_transport_allowed("ftps"))
746 allowed_protocols |= CURLPROTO_FTPS;
747 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
748 curl_easy_setopt(result, CURLOPT_PROTOCOLS, allowed_protocols);
749 #else
750 if (transport_restrict_protocols())
751 warning("protocol restrictions not applied to curl redirects because\n"
752 "your curl version is too old (>= 7.19.4)");
753 #endif
754 if (getenv("GIT_CURL_VERBOSE"))
755 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
756 setup_curl_trace(result);
757
758 curl_easy_setopt(result, CURLOPT_USERAGENT,
759 user_agent ? user_agent : git_user_agent());
760
761 if (curl_ftp_no_epsv)
762 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
763
764 #ifdef CURLOPT_USE_SSL
765 if (curl_ssl_try)
766 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
767 #endif
768
769 /*
770 * CURL also examines these variables as a fallback; but we need to query
771 * them here in order to decide whether to prompt for missing password (cf.
772 * init_curl_proxy_auth()).
773 *
774 * Unlike many other common environment variables, these are historically
775 * lowercase only. It appears that CURL did not know this and implemented
776 * only uppercase variants, which was later corrected to take both - with
777 * the exception of http_proxy, which is lowercase only also in CURL. As
778 * the lowercase versions are the historical quasi-standard, they take
779 * precedence here, as in CURL.
780 */
781 if (!curl_http_proxy) {
782 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
783 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
784 var_override(&curl_http_proxy, getenv("https_proxy"));
785 } else {
786 var_override(&curl_http_proxy, getenv("http_proxy"));
787 }
788 if (!curl_http_proxy) {
789 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
790 var_override(&curl_http_proxy, getenv("all_proxy"));
791 }
792 }
793
794 if (curl_http_proxy) {
795 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
796 #if LIBCURL_VERSION_NUM >= 0x071800
797 if (starts_with(curl_http_proxy, "socks5h"))
798 curl_easy_setopt(result,
799 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
800 else if (starts_with(curl_http_proxy, "socks5"))
801 curl_easy_setopt(result,
802 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
803 else if (starts_with(curl_http_proxy, "socks4a"))
804 curl_easy_setopt(result,
805 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
806 else if (starts_with(curl_http_proxy, "socks"))
807 curl_easy_setopt(result,
808 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
809 #endif
810 if (strstr(curl_http_proxy, "://"))
811 credential_from_url(&proxy_auth, curl_http_proxy);
812 else {
813 struct strbuf url = STRBUF_INIT;
814 strbuf_addf(&url, "http://%s", curl_http_proxy);
815 credential_from_url(&proxy_auth, url.buf);
816 strbuf_release(&url);
817 }
818
819 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
820 #if LIBCURL_VERSION_NUM >= 0x071304
821 var_override(&curl_no_proxy, getenv("NO_PROXY"));
822 var_override(&curl_no_proxy, getenv("no_proxy"));
823 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
824 #endif
825 }
826 init_curl_proxy_auth(result);
827
828 set_curl_keepalive(result);
829
830 return result;
831 }
832
833 static void set_from_env(const char **var, const char *envname)
834 {
835 const char *val = getenv(envname);
836 if (val)
837 *var = val;
838 }
839
840 void http_init(struct remote *remote, const char *url, int proactive_auth)
841 {
842 char *low_speed_limit;
843 char *low_speed_time;
844 char *normalized_url;
845 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
846
847 config.section = "http";
848 config.key = NULL;
849 config.collect_fn = http_options;
850 config.cascade_fn = git_default_config;
851 config.cb = NULL;
852
853 http_is_verbose = 0;
854 normalized_url = url_normalize(url, &config.url);
855
856 git_config(urlmatch_config_entry, &config);
857 free(normalized_url);
858
859 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
860 die("curl_global_init failed");
861
862 http_proactive_auth = proactive_auth;
863
864 if (remote && remote->http_proxy)
865 curl_http_proxy = xstrdup(remote->http_proxy);
866
867 if (remote)
868 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
869
870 pragma_header = curl_slist_append(http_copy_default_headers(),
871 "Pragma: no-cache");
872 no_pragma_header = curl_slist_append(http_copy_default_headers(),
873 "Pragma:");
874
875 #ifdef USE_CURL_MULTI
876 {
877 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
878 if (http_max_requests != NULL)
879 max_requests = atoi(http_max_requests);
880 }
881
882 curlm = curl_multi_init();
883 if (!curlm)
884 die("curl_multi_init failed");
885 #endif
886
887 if (getenv("GIT_SSL_NO_VERIFY"))
888 curl_ssl_verify = 0;
889
890 set_from_env(&ssl_cert, "GIT_SSL_CERT");
891 #if LIBCURL_VERSION_NUM >= 0x070903
892 set_from_env(&ssl_key, "GIT_SSL_KEY");
893 #endif
894 #if LIBCURL_VERSION_NUM >= 0x070908
895 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
896 #endif
897 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
898
899 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
900
901 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
902 if (low_speed_limit != NULL)
903 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
904 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
905 if (low_speed_time != NULL)
906 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
907
908 if (curl_ssl_verify == -1)
909 curl_ssl_verify = 1;
910
911 curl_session_count = 0;
912 #ifdef USE_CURL_MULTI
913 if (max_requests < 1)
914 max_requests = DEFAULT_MAX_REQUESTS;
915 #endif
916
917 if (getenv("GIT_CURL_FTP_NO_EPSV"))
918 curl_ftp_no_epsv = 1;
919
920 if (url) {
921 credential_from_url(&http_auth, url);
922 if (!ssl_cert_password_required &&
923 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
924 starts_with(url, "https://"))
925 ssl_cert_password_required = 1;
926 }
927
928 #ifndef NO_CURL_EASY_DUPHANDLE
929 curl_default = get_curl_handle();
930 #endif
931 }
932
933 void http_cleanup(void)
934 {
935 struct active_request_slot *slot = active_queue_head;
936
937 while (slot != NULL) {
938 struct active_request_slot *next = slot->next;
939 if (slot->curl != NULL) {
940 xmulti_remove_handle(slot);
941 curl_easy_cleanup(slot->curl);
942 }
943 free(slot);
944 slot = next;
945 }
946 active_queue_head = NULL;
947
948 #ifndef NO_CURL_EASY_DUPHANDLE
949 curl_easy_cleanup(curl_default);
950 #endif
951
952 #ifdef USE_CURL_MULTI
953 curl_multi_cleanup(curlm);
954 #endif
955 curl_global_cleanup();
956
957 curl_slist_free_all(extra_http_headers);
958 extra_http_headers = NULL;
959
960 curl_slist_free_all(pragma_header);
961 pragma_header = NULL;
962
963 curl_slist_free_all(no_pragma_header);
964 no_pragma_header = NULL;
965
966 if (curl_http_proxy) {
967 free((void *)curl_http_proxy);
968 curl_http_proxy = NULL;
969 }
970
971 if (proxy_auth.password) {
972 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
973 free(proxy_auth.password);
974 proxy_auth.password = NULL;
975 }
976
977 free((void *)curl_proxyuserpwd);
978 curl_proxyuserpwd = NULL;
979
980 free((void *)http_proxy_authmethod);
981 http_proxy_authmethod = NULL;
982
983 if (cert_auth.password != NULL) {
984 memset(cert_auth.password, 0, strlen(cert_auth.password));
985 free(cert_auth.password);
986 cert_auth.password = NULL;
987 }
988 ssl_cert_password_required = 0;
989
990 free(cached_accept_language);
991 cached_accept_language = NULL;
992 }
993
994 struct active_request_slot *get_active_slot(void)
995 {
996 struct active_request_slot *slot = active_queue_head;
997 struct active_request_slot *newslot;
998
999 #ifdef USE_CURL_MULTI
1000 int num_transfers;
1001
1002 /* Wait for a slot to open up if the queue is full */
1003 while (active_requests >= max_requests) {
1004 curl_multi_perform(curlm, &num_transfers);
1005 if (num_transfers < active_requests)
1006 process_curl_messages();
1007 }
1008 #endif
1009
1010 while (slot != NULL && slot->in_use)
1011 slot = slot->next;
1012
1013 if (slot == NULL) {
1014 newslot = xmalloc(sizeof(*newslot));
1015 newslot->curl = NULL;
1016 newslot->in_use = 0;
1017 newslot->next = NULL;
1018
1019 slot = active_queue_head;
1020 if (slot == NULL) {
1021 active_queue_head = newslot;
1022 } else {
1023 while (slot->next != NULL)
1024 slot = slot->next;
1025 slot->next = newslot;
1026 }
1027 slot = newslot;
1028 }
1029
1030 if (slot->curl == NULL) {
1031 #ifdef NO_CURL_EASY_DUPHANDLE
1032 slot->curl = get_curl_handle();
1033 #else
1034 slot->curl = curl_easy_duphandle(curl_default);
1035 #endif
1036 curl_session_count++;
1037 }
1038
1039 active_requests++;
1040 slot->in_use = 1;
1041 slot->results = NULL;
1042 slot->finished = NULL;
1043 slot->callback_data = NULL;
1044 slot->callback_func = NULL;
1045 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1046 if (curl_save_cookies)
1047 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1048 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1049 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1050 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1051 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1052 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1053 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1054 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1055 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1056 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1057 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1058
1059 /*
1060 * Default following to off unless "ALWAYS" is configured; this gives
1061 * callers a sane starting point, and they can tweak for individual
1062 * HTTP_FOLLOW_* cases themselves.
1063 */
1064 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1065 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1066 else
1067 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1068
1069 #if LIBCURL_VERSION_NUM >= 0x070a08
1070 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1071 #endif
1072 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1073 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1074 #endif
1075 if (http_auth.password || curl_empty_auth)
1076 init_curl_http_auth(slot->curl);
1077
1078 return slot;
1079 }
1080
1081 int start_active_slot(struct active_request_slot *slot)
1082 {
1083 #ifdef USE_CURL_MULTI
1084 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1085 int num_transfers;
1086
1087 if (curlm_result != CURLM_OK &&
1088 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1089 warning("curl_multi_add_handle failed: %s",
1090 curl_multi_strerror(curlm_result));
1091 active_requests--;
1092 slot->in_use = 0;
1093 return 0;
1094 }
1095
1096 /*
1097 * We know there must be something to do, since we just added
1098 * something.
1099 */
1100 curl_multi_perform(curlm, &num_transfers);
1101 #endif
1102 return 1;
1103 }
1104
1105 #ifdef USE_CURL_MULTI
1106 struct fill_chain {
1107 void *data;
1108 int (*fill)(void *);
1109 struct fill_chain *next;
1110 };
1111
1112 static struct fill_chain *fill_cfg;
1113
1114 void add_fill_function(void *data, int (*fill)(void *))
1115 {
1116 struct fill_chain *new = xmalloc(sizeof(*new));
1117 struct fill_chain **linkp = &fill_cfg;
1118 new->data = data;
1119 new->fill = fill;
1120 new->next = NULL;
1121 while (*linkp)
1122 linkp = &(*linkp)->next;
1123 *linkp = new;
1124 }
1125
1126 void fill_active_slots(void)
1127 {
1128 struct active_request_slot *slot = active_queue_head;
1129
1130 while (active_requests < max_requests) {
1131 struct fill_chain *fill;
1132 for (fill = fill_cfg; fill; fill = fill->next)
1133 if (fill->fill(fill->data))
1134 break;
1135
1136 if (!fill)
1137 break;
1138 }
1139
1140 while (slot != NULL) {
1141 if (!slot->in_use && slot->curl != NULL
1142 && curl_session_count > min_curl_sessions) {
1143 curl_easy_cleanup(slot->curl);
1144 slot->curl = NULL;
1145 curl_session_count--;
1146 }
1147 slot = slot->next;
1148 }
1149 }
1150
1151 void step_active_slots(void)
1152 {
1153 int num_transfers;
1154 CURLMcode curlm_result;
1155
1156 do {
1157 curlm_result = curl_multi_perform(curlm, &num_transfers);
1158 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1159 if (num_transfers < active_requests) {
1160 process_curl_messages();
1161 fill_active_slots();
1162 }
1163 }
1164 #endif
1165
1166 void run_active_slot(struct active_request_slot *slot)
1167 {
1168 #ifdef USE_CURL_MULTI
1169 fd_set readfds;
1170 fd_set writefds;
1171 fd_set excfds;
1172 int max_fd;
1173 struct timeval select_timeout;
1174 int finished = 0;
1175
1176 slot->finished = &finished;
1177 while (!finished) {
1178 step_active_slots();
1179
1180 if (slot->in_use) {
1181 #if LIBCURL_VERSION_NUM >= 0x070f04
1182 long curl_timeout;
1183 curl_multi_timeout(curlm, &curl_timeout);
1184 if (curl_timeout == 0) {
1185 continue;
1186 } else if (curl_timeout == -1) {
1187 select_timeout.tv_sec = 0;
1188 select_timeout.tv_usec = 50000;
1189 } else {
1190 select_timeout.tv_sec = curl_timeout / 1000;
1191 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1192 }
1193 #else
1194 select_timeout.tv_sec = 0;
1195 select_timeout.tv_usec = 50000;
1196 #endif
1197
1198 max_fd = -1;
1199 FD_ZERO(&readfds);
1200 FD_ZERO(&writefds);
1201 FD_ZERO(&excfds);
1202 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1203
1204 /*
1205 * It can happen that curl_multi_timeout returns a pathologically
1206 * long timeout when curl_multi_fdset returns no file descriptors
1207 * to read. See commit message for more details.
1208 */
1209 if (max_fd < 0 &&
1210 (select_timeout.tv_sec > 0 ||
1211 select_timeout.tv_usec > 50000)) {
1212 select_timeout.tv_sec = 0;
1213 select_timeout.tv_usec = 50000;
1214 }
1215
1216 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1217 }
1218 }
1219 #else
1220 while (slot->in_use) {
1221 slot->curl_result = curl_easy_perform(slot->curl);
1222 finish_active_slot(slot);
1223 }
1224 #endif
1225 }
1226
1227 static void release_active_slot(struct active_request_slot *slot)
1228 {
1229 closedown_active_slot(slot);
1230 if (slot->curl) {
1231 xmulti_remove_handle(slot);
1232 if (curl_session_count > min_curl_sessions) {
1233 curl_easy_cleanup(slot->curl);
1234 slot->curl = NULL;
1235 curl_session_count--;
1236 }
1237 }
1238 #ifdef USE_CURL_MULTI
1239 fill_active_slots();
1240 #endif
1241 }
1242
1243 void finish_all_active_slots(void)
1244 {
1245 struct active_request_slot *slot = active_queue_head;
1246
1247 while (slot != NULL)
1248 if (slot->in_use) {
1249 run_active_slot(slot);
1250 slot = active_queue_head;
1251 } else {
1252 slot = slot->next;
1253 }
1254 }
1255
1256 /* Helpers for modifying and creating URLs */
1257 static inline int needs_quote(int ch)
1258 {
1259 if (((ch >= 'A') && (ch <= 'Z'))
1260 || ((ch >= 'a') && (ch <= 'z'))
1261 || ((ch >= '0') && (ch <= '9'))
1262 || (ch == '/')
1263 || (ch == '-')
1264 || (ch == '.'))
1265 return 0;
1266 return 1;
1267 }
1268
1269 static char *quote_ref_url(const char *base, const char *ref)
1270 {
1271 struct strbuf buf = STRBUF_INIT;
1272 const char *cp;
1273 int ch;
1274
1275 end_url_with_slash(&buf, base);
1276
1277 for (cp = ref; (ch = *cp) != 0; cp++)
1278 if (needs_quote(ch))
1279 strbuf_addf(&buf, "%%%02x", ch);
1280 else
1281 strbuf_addch(&buf, *cp);
1282
1283 return strbuf_detach(&buf, NULL);
1284 }
1285
1286 void append_remote_object_url(struct strbuf *buf, const char *url,
1287 const char *hex,
1288 int only_two_digit_prefix)
1289 {
1290 end_url_with_slash(buf, url);
1291
1292 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1293 if (!only_two_digit_prefix)
1294 strbuf_addstr(buf, hex + 2);
1295 }
1296
1297 char *get_remote_object_url(const char *url, const char *hex,
1298 int only_two_digit_prefix)
1299 {
1300 struct strbuf buf = STRBUF_INIT;
1301 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1302 return strbuf_detach(&buf, NULL);
1303 }
1304
1305 static int handle_curl_result(struct slot_results *results)
1306 {
1307 /*
1308 * If we see a failing http code with CURLE_OK, we have turned off
1309 * FAILONERROR (to keep the server's custom error response), and should
1310 * translate the code into failure here.
1311 *
1312 * Likewise, if we see a redirect (30x code), that means we turned off
1313 * redirect-following, and we should treat the result as an error.
1314 */
1315 if (results->curl_result == CURLE_OK &&
1316 results->http_code >= 300) {
1317 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1318 /*
1319 * Normally curl will already have put the "reason phrase"
1320 * from the server into curl_errorstr; unfortunately without
1321 * FAILONERROR it is lost, so we can give only the numeric
1322 * status code.
1323 */
1324 snprintf(curl_errorstr, sizeof(curl_errorstr),
1325 "The requested URL returned error: %ld",
1326 results->http_code);
1327 }
1328
1329 if (results->curl_result == CURLE_OK) {
1330 credential_approve(&http_auth);
1331 if (proxy_auth.password)
1332 credential_approve(&proxy_auth);
1333 return HTTP_OK;
1334 } else if (missing_target(results))
1335 return HTTP_MISSING_TARGET;
1336 else if (results->http_code == 401) {
1337 if (http_auth.username && http_auth.password) {
1338 credential_reject(&http_auth);
1339 return HTTP_NOAUTH;
1340 } else {
1341 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1342 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1343 #endif
1344 return HTTP_REAUTH;
1345 }
1346 } else {
1347 if (results->http_connectcode == 407)
1348 credential_reject(&proxy_auth);
1349 #if LIBCURL_VERSION_NUM >= 0x070c00
1350 if (!curl_errorstr[0])
1351 strlcpy(curl_errorstr,
1352 curl_easy_strerror(results->curl_result),
1353 sizeof(curl_errorstr));
1354 #endif
1355 return HTTP_ERROR;
1356 }
1357 }
1358
1359 int run_one_slot(struct active_request_slot *slot,
1360 struct slot_results *results)
1361 {
1362 slot->results = results;
1363 if (!start_active_slot(slot)) {
1364 snprintf(curl_errorstr, sizeof(curl_errorstr),
1365 "failed to start HTTP request");
1366 return HTTP_START_FAILED;
1367 }
1368
1369 run_active_slot(slot);
1370 return handle_curl_result(results);
1371 }
1372
1373 struct curl_slist *http_copy_default_headers(void)
1374 {
1375 struct curl_slist *headers = NULL, *h;
1376
1377 for (h = extra_http_headers; h; h = h->next)
1378 headers = curl_slist_append(headers, h->data);
1379
1380 return headers;
1381 }
1382
1383 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1384 {
1385 char *ptr;
1386 CURLcode ret;
1387
1388 strbuf_reset(buf);
1389 ret = curl_easy_getinfo(curl, info, &ptr);
1390 if (!ret && ptr)
1391 strbuf_addstr(buf, ptr);
1392 return ret;
1393 }
1394
1395 /*
1396 * Check for and extract a content-type parameter. "raw"
1397 * should be positioned at the start of the potential
1398 * parameter, with any whitespace already removed.
1399 *
1400 * "name" is the name of the parameter. The value is appended
1401 * to "out".
1402 */
1403 static int extract_param(const char *raw, const char *name,
1404 struct strbuf *out)
1405 {
1406 size_t len = strlen(name);
1407
1408 if (strncasecmp(raw, name, len))
1409 return -1;
1410 raw += len;
1411
1412 if (*raw != '=')
1413 return -1;
1414 raw++;
1415
1416 while (*raw && !isspace(*raw) && *raw != ';')
1417 strbuf_addch(out, *raw++);
1418 return 0;
1419 }
1420
1421 /*
1422 * Extract a normalized version of the content type, with any
1423 * spaces suppressed, all letters lowercased, and no trailing ";"
1424 * or parameters.
1425 *
1426 * Note that we will silently remove even invalid whitespace. For
1427 * example, "text / plain" is specifically forbidden by RFC 2616,
1428 * but "text/plain" is the only reasonable output, and this keeps
1429 * our code simple.
1430 *
1431 * If the "charset" argument is not NULL, store the value of any
1432 * charset parameter there.
1433 *
1434 * Example:
1435 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1436 * "text / plain" -> "text/plain"
1437 */
1438 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1439 struct strbuf *charset)
1440 {
1441 const char *p;
1442
1443 strbuf_reset(type);
1444 strbuf_grow(type, raw->len);
1445 for (p = raw->buf; *p; p++) {
1446 if (isspace(*p))
1447 continue;
1448 if (*p == ';') {
1449 p++;
1450 break;
1451 }
1452 strbuf_addch(type, tolower(*p));
1453 }
1454
1455 if (!charset)
1456 return;
1457
1458 strbuf_reset(charset);
1459 while (*p) {
1460 while (isspace(*p) || *p == ';')
1461 p++;
1462 if (!extract_param(p, "charset", charset))
1463 return;
1464 while (*p && !isspace(*p))
1465 p++;
1466 }
1467
1468 if (!charset->len && starts_with(type->buf, "text/"))
1469 strbuf_addstr(charset, "ISO-8859-1");
1470 }
1471
1472 static void write_accept_language(struct strbuf *buf)
1473 {
1474 /*
1475 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1476 * that, q-value will be smaller than 0.001, the minimum q-value the
1477 * HTTP specification allows. See
1478 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1479 */
1480 const int MAX_DECIMAL_PLACES = 3;
1481 const int MAX_LANGUAGE_TAGS = 1000;
1482 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1483 char **language_tags = NULL;
1484 int num_langs = 0;
1485 const char *s = get_preferred_languages();
1486 int i;
1487 struct strbuf tag = STRBUF_INIT;
1488
1489 /* Don't add Accept-Language header if no language is preferred. */
1490 if (!s)
1491 return;
1492
1493 /*
1494 * Split the colon-separated string of preferred languages into
1495 * language_tags array.
1496 */
1497 do {
1498 /* collect language tag */
1499 for (; *s && (isalnum(*s) || *s == '_'); s++)
1500 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1501
1502 /* skip .codeset, @modifier and any other unnecessary parts */
1503 while (*s && *s != ':')
1504 s++;
1505
1506 if (tag.len) {
1507 num_langs++;
1508 REALLOC_ARRAY(language_tags, num_langs);
1509 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1510 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1511 break;
1512 }
1513 } while (*s++);
1514
1515 /* write Accept-Language header into buf */
1516 if (num_langs) {
1517 int last_buf_len = 0;
1518 int max_q;
1519 int decimal_places;
1520 char q_format[32];
1521
1522 /* add '*' */
1523 REALLOC_ARRAY(language_tags, num_langs + 1);
1524 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1525
1526 /* compute decimal_places */
1527 for (max_q = 1, decimal_places = 0;
1528 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1529 decimal_places++, max_q *= 10)
1530 ;
1531
1532 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1533
1534 strbuf_addstr(buf, "Accept-Language: ");
1535
1536 for (i = 0; i < num_langs; i++) {
1537 if (i > 0)
1538 strbuf_addstr(buf, ", ");
1539
1540 strbuf_addstr(buf, language_tags[i]);
1541
1542 if (i > 0)
1543 strbuf_addf(buf, q_format, max_q - i);
1544
1545 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1546 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1547 break;
1548 }
1549
1550 last_buf_len = buf->len;
1551 }
1552 }
1553
1554 /* free language tags -- last one is a static '*' */
1555 for (i = 0; i < num_langs - 1; i++)
1556 free(language_tags[i]);
1557 free(language_tags);
1558 }
1559
1560 /*
1561 * Get an Accept-Language header which indicates user's preferred languages.
1562 *
1563 * Examples:
1564 * LANGUAGE= -> ""
1565 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1566 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1567 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1568 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1569 * LANGUAGE= LANG=C -> ""
1570 */
1571 static const char *get_accept_language(void)
1572 {
1573 if (!cached_accept_language) {
1574 struct strbuf buf = STRBUF_INIT;
1575 write_accept_language(&buf);
1576 if (buf.len > 0)
1577 cached_accept_language = strbuf_detach(&buf, NULL);
1578 }
1579
1580 return cached_accept_language;
1581 }
1582
1583 static void http_opt_request_remainder(CURL *curl, off_t pos)
1584 {
1585 char buf[128];
1586 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1587 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1588 }
1589
1590 /* http_request() targets */
1591 #define HTTP_REQUEST_STRBUF 0
1592 #define HTTP_REQUEST_FILE 1
1593
1594 static int http_request(const char *url,
1595 void *result, int target,
1596 const struct http_get_options *options)
1597 {
1598 struct active_request_slot *slot;
1599 struct slot_results results;
1600 struct curl_slist *headers = http_copy_default_headers();
1601 struct strbuf buf = STRBUF_INIT;
1602 const char *accept_language;
1603 int ret;
1604
1605 slot = get_active_slot();
1606 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1607
1608 if (result == NULL) {
1609 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1610 } else {
1611 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1612 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1613
1614 if (target == HTTP_REQUEST_FILE) {
1615 off_t posn = ftello(result);
1616 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1617 fwrite);
1618 if (posn > 0)
1619 http_opt_request_remainder(slot->curl, posn);
1620 } else
1621 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1622 fwrite_buffer);
1623 }
1624
1625 accept_language = get_accept_language();
1626
1627 if (accept_language)
1628 headers = curl_slist_append(headers, accept_language);
1629
1630 strbuf_addstr(&buf, "Pragma:");
1631 if (options && options->no_cache)
1632 strbuf_addstr(&buf, " no-cache");
1633 if (options && options->keep_error)
1634 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1635 if (options && options->initial_request &&
1636 http_follow_config == HTTP_FOLLOW_INITIAL)
1637 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1638
1639 headers = curl_slist_append(headers, buf.buf);
1640
1641 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1642 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1643 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1644
1645 ret = run_one_slot(slot, &results);
1646
1647 if (options && options->content_type) {
1648 struct strbuf raw = STRBUF_INIT;
1649 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1650 extract_content_type(&raw, options->content_type,
1651 options->charset);
1652 strbuf_release(&raw);
1653 }
1654
1655 if (options && options->effective_url)
1656 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1657 options->effective_url);
1658
1659 curl_slist_free_all(headers);
1660 strbuf_release(&buf);
1661
1662 return ret;
1663 }
1664
1665 /*
1666 * Update the "base" url to a more appropriate value, as deduced by
1667 * redirects seen when requesting a URL starting with "url".
1668 *
1669 * The "asked" parameter is a URL that we asked curl to access, and must begin
1670 * with "base".
1671 *
1672 * The "got" parameter is the URL that curl reported to us as where we ended
1673 * up.
1674 *
1675 * Returns 1 if we updated the base url, 0 otherwise.
1676 *
1677 * Our basic strategy is to compare "base" and "asked" to find the bits
1678 * specific to our request. We then strip those bits off of "got" to yield the
1679 * new base. So for example, if our base is "http://example.com/foo.git",
1680 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1681 * with "https://other.example.com/foo.git/info/refs". We would want the
1682 * new URL to become "https://other.example.com/foo.git".
1683 *
1684 * Note that this assumes a sane redirect scheme. It's entirely possible
1685 * in the example above to end up at a URL that does not even end in
1686 * "info/refs". In such a case we die. There's not much we can do, such a
1687 * scheme is unlikely to represent a real git repository, and failing to
1688 * rewrite the base opens options for malicious redirects to do funny things.
1689 */
1690 static int update_url_from_redirect(struct strbuf *base,
1691 const char *asked,
1692 const struct strbuf *got)
1693 {
1694 const char *tail;
1695 size_t new_len;
1696
1697 if (!strcmp(asked, got->buf))
1698 return 0;
1699
1700 if (!skip_prefix(asked, base->buf, &tail))
1701 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1702 asked, base->buf);
1703
1704 new_len = got->len;
1705 if (!strip_suffix_mem(got->buf, &new_len, tail))
1706 die(_("unable to update url base from redirection:\n"
1707 " asked for: %s\n"
1708 " redirect: %s"),
1709 asked, got->buf);
1710
1711 strbuf_reset(base);
1712 strbuf_add(base, got->buf, new_len);
1713
1714 return 1;
1715 }
1716
1717 static int http_request_reauth(const char *url,
1718 void *result, int target,
1719 struct http_get_options *options)
1720 {
1721 int ret = http_request(url, result, target, options);
1722
1723 if (options && options->effective_url && options->base_url) {
1724 if (update_url_from_redirect(options->base_url,
1725 url, options->effective_url)) {
1726 credential_from_url(&http_auth, options->base_url->buf);
1727 url = options->effective_url->buf;
1728 }
1729 }
1730
1731 if (ret != HTTP_REAUTH)
1732 return ret;
1733
1734 /*
1735 * If we are using KEEP_ERROR, the previous request may have
1736 * put cruft into our output stream; we should clear it out before
1737 * making our next request. We only know how to do this for
1738 * the strbuf case, but that is enough to satisfy current callers.
1739 */
1740 if (options && options->keep_error) {
1741 switch (target) {
1742 case HTTP_REQUEST_STRBUF:
1743 strbuf_reset(result);
1744 break;
1745 default:
1746 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1747 }
1748 }
1749
1750 credential_fill(&http_auth);
1751
1752 return http_request(url, result, target, options);
1753 }
1754
1755 int http_get_strbuf(const char *url,
1756 struct strbuf *result,
1757 struct http_get_options *options)
1758 {
1759 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1760 }
1761
1762 /*
1763 * Downloads a URL and stores the result in the given file.
1764 *
1765 * If a previous interrupted download is detected (i.e. a previous temporary
1766 * file is still around) the download is resumed.
1767 */
1768 static int http_get_file(const char *url, const char *filename,
1769 struct http_get_options *options)
1770 {
1771 int ret;
1772 struct strbuf tmpfile = STRBUF_INIT;
1773 FILE *result;
1774
1775 strbuf_addf(&tmpfile, "%s.temp", filename);
1776 result = fopen(tmpfile.buf, "a");
1777 if (!result) {
1778 error("Unable to open local file %s", tmpfile.buf);
1779 ret = HTTP_ERROR;
1780 goto cleanup;
1781 }
1782
1783 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1784 fclose(result);
1785
1786 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1787 ret = HTTP_ERROR;
1788 cleanup:
1789 strbuf_release(&tmpfile);
1790 return ret;
1791 }
1792
1793 int http_fetch_ref(const char *base, struct ref *ref)
1794 {
1795 struct http_get_options options = {0};
1796 char *url;
1797 struct strbuf buffer = STRBUF_INIT;
1798 int ret = -1;
1799
1800 options.no_cache = 1;
1801
1802 url = quote_ref_url(base, ref->name);
1803 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1804 strbuf_rtrim(&buffer);
1805 if (buffer.len == 40)
1806 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1807 else if (starts_with(buffer.buf, "ref: ")) {
1808 ref->symref = xstrdup(buffer.buf + 5);
1809 ret = 0;
1810 }
1811 }
1812
1813 strbuf_release(&buffer);
1814 free(url);
1815 return ret;
1816 }
1817
1818 /* Helpers for fetching packs */
1819 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1820 {
1821 char *url, *tmp;
1822 struct strbuf buf = STRBUF_INIT;
1823
1824 if (http_is_verbose)
1825 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1826
1827 end_url_with_slash(&buf, base_url);
1828 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1829 url = strbuf_detach(&buf, NULL);
1830
1831 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1832 tmp = strbuf_detach(&buf, NULL);
1833
1834 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1835 error("Unable to get pack index %s", url);
1836 free(tmp);
1837 tmp = NULL;
1838 }
1839
1840 free(url);
1841 return tmp;
1842 }
1843
1844 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1845 unsigned char *sha1, const char *base_url)
1846 {
1847 struct packed_git *new_pack;
1848 char *tmp_idx = NULL;
1849 int ret;
1850
1851 if (has_pack_index(sha1)) {
1852 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1853 if (!new_pack)
1854 return -1; /* parse_pack_index() already issued error message */
1855 goto add_pack;
1856 }
1857
1858 tmp_idx = fetch_pack_index(sha1, base_url);
1859 if (!tmp_idx)
1860 return -1;
1861
1862 new_pack = parse_pack_index(sha1, tmp_idx);
1863 if (!new_pack) {
1864 unlink(tmp_idx);
1865 free(tmp_idx);
1866
1867 return -1; /* parse_pack_index() already issued error message */
1868 }
1869
1870 ret = verify_pack_index(new_pack);
1871 if (!ret) {
1872 close_pack_index(new_pack);
1873 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1874 }
1875 free(tmp_idx);
1876 if (ret)
1877 return -1;
1878
1879 add_pack:
1880 new_pack->next = *packs_head;
1881 *packs_head = new_pack;
1882 return 0;
1883 }
1884
1885 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1886 {
1887 struct http_get_options options = {0};
1888 int ret = 0, i = 0;
1889 char *url, *data;
1890 struct strbuf buf = STRBUF_INIT;
1891 unsigned char sha1[20];
1892
1893 end_url_with_slash(&buf, base_url);
1894 strbuf_addstr(&buf, "objects/info/packs");
1895 url = strbuf_detach(&buf, NULL);
1896
1897 options.no_cache = 1;
1898 ret = http_get_strbuf(url, &buf, &options);
1899 if (ret != HTTP_OK)
1900 goto cleanup;
1901
1902 data = buf.buf;
1903 while (i < buf.len) {
1904 switch (data[i]) {
1905 case 'P':
1906 i++;
1907 if (i + 52 <= buf.len &&
1908 starts_with(data + i, " pack-") &&
1909 starts_with(data + i + 46, ".pack\n")) {
1910 get_sha1_hex(data + i + 6, sha1);
1911 fetch_and_setup_pack_index(packs_head, sha1,
1912 base_url);
1913 i += 51;
1914 break;
1915 }
1916 default:
1917 while (i < buf.len && data[i] != '\n')
1918 i++;
1919 }
1920 i++;
1921 }
1922
1923 cleanup:
1924 free(url);
1925 return ret;
1926 }
1927
1928 void release_http_pack_request(struct http_pack_request *preq)
1929 {
1930 if (preq->packfile != NULL) {
1931 fclose(preq->packfile);
1932 preq->packfile = NULL;
1933 }
1934 preq->slot = NULL;
1935 free(preq->url);
1936 free(preq);
1937 }
1938
1939 int finish_http_pack_request(struct http_pack_request *preq)
1940 {
1941 struct packed_git **lst;
1942 struct packed_git *p = preq->target;
1943 char *tmp_idx;
1944 size_t len;
1945 struct child_process ip = CHILD_PROCESS_INIT;
1946 const char *ip_argv[8];
1947
1948 close_pack_index(p);
1949
1950 fclose(preq->packfile);
1951 preq->packfile = NULL;
1952
1953 lst = preq->lst;
1954 while (*lst != p)
1955 lst = &((*lst)->next);
1956 *lst = (*lst)->next;
1957
1958 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1959 die("BUG: pack tmpfile does not end in .pack.temp?");
1960 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1961
1962 ip_argv[0] = "index-pack";
1963 ip_argv[1] = "-o";
1964 ip_argv[2] = tmp_idx;
1965 ip_argv[3] = preq->tmpfile;
1966 ip_argv[4] = NULL;
1967
1968 ip.argv = ip_argv;
1969 ip.git_cmd = 1;
1970 ip.no_stdin = 1;
1971 ip.no_stdout = 1;
1972
1973 if (run_command(&ip)) {
1974 unlink(preq->tmpfile);
1975 unlink(tmp_idx);
1976 free(tmp_idx);
1977 return -1;
1978 }
1979
1980 unlink(sha1_pack_index_name(p->sha1));
1981
1982 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1983 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1984 free(tmp_idx);
1985 return -1;
1986 }
1987
1988 install_packed_git(p);
1989 free(tmp_idx);
1990 return 0;
1991 }
1992
1993 struct http_pack_request *new_http_pack_request(
1994 struct packed_git *target, const char *base_url)
1995 {
1996 off_t prev_posn = 0;
1997 struct strbuf buf = STRBUF_INIT;
1998 struct http_pack_request *preq;
1999
2000 preq = xcalloc(1, sizeof(*preq));
2001 preq->target = target;
2002
2003 end_url_with_slash(&buf, base_url);
2004 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2005 sha1_to_hex(target->sha1));
2006 preq->url = strbuf_detach(&buf, NULL);
2007
2008 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2009 sha1_pack_name(target->sha1));
2010 preq->packfile = fopen(preq->tmpfile, "a");
2011 if (!preq->packfile) {
2012 error("Unable to open local file %s for pack",
2013 preq->tmpfile);
2014 goto abort;
2015 }
2016
2017 preq->slot = get_active_slot();
2018 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2019 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2020 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2021 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2022 no_pragma_header);
2023
2024 /*
2025 * If there is data present from a previous transfer attempt,
2026 * resume where it left off
2027 */
2028 prev_posn = ftello(preq->packfile);
2029 if (prev_posn>0) {
2030 if (http_is_verbose)
2031 fprintf(stderr,
2032 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2033 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2034 http_opt_request_remainder(preq->slot->curl, prev_posn);
2035 }
2036
2037 return preq;
2038
2039 abort:
2040 free(preq->url);
2041 free(preq);
2042 return NULL;
2043 }
2044
2045 /* Helpers for fetching objects (loose) */
2046 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2047 void *data)
2048 {
2049 unsigned char expn[4096];
2050 size_t size = eltsize * nmemb;
2051 int posn = 0;
2052 struct http_object_request *freq = data;
2053 struct active_request_slot *slot = freq->slot;
2054
2055 if (slot) {
2056 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2057 &slot->http_code);
2058 if (c != CURLE_OK)
2059 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2060 curl_easy_strerror(c));
2061 if (slot->http_code >= 300)
2062 return size;
2063 }
2064
2065 do {
2066 ssize_t retval = xwrite(freq->localfile,
2067 (char *) ptr + posn, size - posn);
2068 if (retval < 0)
2069 return posn;
2070 posn += retval;
2071 } while (posn < size);
2072
2073 freq->stream.avail_in = size;
2074 freq->stream.next_in = (void *)ptr;
2075 do {
2076 freq->stream.next_out = expn;
2077 freq->stream.avail_out = sizeof(expn);
2078 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2079 git_SHA1_Update(&freq->c, expn,
2080 sizeof(expn) - freq->stream.avail_out);
2081 } while (freq->stream.avail_in && freq->zret == Z_OK);
2082 return size;
2083 }
2084
2085 struct http_object_request *new_http_object_request(const char *base_url,
2086 unsigned char *sha1)
2087 {
2088 char *hex = sha1_to_hex(sha1);
2089 const char *filename;
2090 char prevfile[PATH_MAX];
2091 int prevlocal;
2092 char prev_buf[PREV_BUF_SIZE];
2093 ssize_t prev_read = 0;
2094 off_t prev_posn = 0;
2095 struct http_object_request *freq;
2096
2097 freq = xcalloc(1, sizeof(*freq));
2098 hashcpy(freq->sha1, sha1);
2099 freq->localfile = -1;
2100
2101 filename = sha1_file_name(sha1);
2102 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2103 "%s.temp", filename);
2104
2105 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2106 unlink_or_warn(prevfile);
2107 rename(freq->tmpfile, prevfile);
2108 unlink_or_warn(freq->tmpfile);
2109
2110 if (freq->localfile != -1)
2111 error("fd leakage in start: %d", freq->localfile);
2112 freq->localfile = open(freq->tmpfile,
2113 O_WRONLY | O_CREAT | O_EXCL, 0666);
2114 /*
2115 * This could have failed due to the "lazy directory creation";
2116 * try to mkdir the last path component.
2117 */
2118 if (freq->localfile < 0 && errno == ENOENT) {
2119 char *dir = strrchr(freq->tmpfile, '/');
2120 if (dir) {
2121 *dir = 0;
2122 mkdir(freq->tmpfile, 0777);
2123 *dir = '/';
2124 }
2125 freq->localfile = open(freq->tmpfile,
2126 O_WRONLY | O_CREAT | O_EXCL, 0666);
2127 }
2128
2129 if (freq->localfile < 0) {
2130 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2131 goto abort;
2132 }
2133
2134 git_inflate_init(&freq->stream);
2135
2136 git_SHA1_Init(&freq->c);
2137
2138 freq->url = get_remote_object_url(base_url, hex, 0);
2139
2140 /*
2141 * If a previous temp file is present, process what was already
2142 * fetched.
2143 */
2144 prevlocal = open(prevfile, O_RDONLY);
2145 if (prevlocal != -1) {
2146 do {
2147 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2148 if (prev_read>0) {
2149 if (fwrite_sha1_file(prev_buf,
2150 1,
2151 prev_read,
2152 freq) == prev_read) {
2153 prev_posn += prev_read;
2154 } else {
2155 prev_read = -1;
2156 }
2157 }
2158 } while (prev_read > 0);
2159 close(prevlocal);
2160 }
2161 unlink_or_warn(prevfile);
2162
2163 /*
2164 * Reset inflate/SHA1 if there was an error reading the previous temp
2165 * file; also rewind to the beginning of the local file.
2166 */
2167 if (prev_read == -1) {
2168 memset(&freq->stream, 0, sizeof(freq->stream));
2169 git_inflate_init(&freq->stream);
2170 git_SHA1_Init(&freq->c);
2171 if (prev_posn>0) {
2172 prev_posn = 0;
2173 lseek(freq->localfile, 0, SEEK_SET);
2174 if (ftruncate(freq->localfile, 0) < 0) {
2175 error_errno("Couldn't truncate temporary file %s",
2176 freq->tmpfile);
2177 goto abort;
2178 }
2179 }
2180 }
2181
2182 freq->slot = get_active_slot();
2183
2184 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2185 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2186 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2187 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2188 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2189 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2190
2191 /*
2192 * If we have successfully processed data from a previous fetch
2193 * attempt, only fetch the data we don't already have.
2194 */
2195 if (prev_posn>0) {
2196 if (http_is_verbose)
2197 fprintf(stderr,
2198 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2199 hex, (uintmax_t)prev_posn);
2200 http_opt_request_remainder(freq->slot->curl, prev_posn);
2201 }
2202
2203 return freq;
2204
2205 abort:
2206 free(freq->url);
2207 free(freq);
2208 return NULL;
2209 }
2210
2211 void process_http_object_request(struct http_object_request *freq)
2212 {
2213 if (freq->slot == NULL)
2214 return;
2215 freq->curl_result = freq->slot->curl_result;
2216 freq->http_code = freq->slot->http_code;
2217 freq->slot = NULL;
2218 }
2219
2220 int finish_http_object_request(struct http_object_request *freq)
2221 {
2222 struct stat st;
2223
2224 close(freq->localfile);
2225 freq->localfile = -1;
2226
2227 process_http_object_request(freq);
2228
2229 if (freq->http_code == 416) {
2230 warning("requested range invalid; we may already have all the data.");
2231 } else if (freq->curl_result != CURLE_OK) {
2232 if (stat(freq->tmpfile, &st) == 0)
2233 if (st.st_size == 0)
2234 unlink_or_warn(freq->tmpfile);
2235 return -1;
2236 }
2237
2238 git_inflate_end(&freq->stream);
2239 git_SHA1_Final(freq->real_sha1, &freq->c);
2240 if (freq->zret != Z_STREAM_END) {
2241 unlink_or_warn(freq->tmpfile);
2242 return -1;
2243 }
2244 if (hashcmp(freq->sha1, freq->real_sha1)) {
2245 unlink_or_warn(freq->tmpfile);
2246 return -1;
2247 }
2248 freq->rename =
2249 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2250
2251 return freq->rename;
2252 }
2253
2254 void abort_http_object_request(struct http_object_request *freq)
2255 {
2256 unlink_or_warn(freq->tmpfile);
2257
2258 release_http_object_request(freq);
2259 }
2260
2261 void release_http_object_request(struct http_object_request *freq)
2262 {
2263 if (freq->localfile != -1) {
2264 close(freq->localfile);
2265 freq->localfile = -1;
2266 }
2267 if (freq->url != NULL) {
2268 free(freq->url);
2269 freq->url = NULL;
2270 }
2271 if (freq->slot != NULL) {
2272 freq->slot->callback_func = NULL;
2273 freq->slot->callback_data = NULL;
2274 release_active_slot(freq->slot);
2275 freq->slot = NULL;
2276 }
2277 }
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