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http: control GSSAPI credential delegation
[git/debian.git] / http.c
blob624f0ce65d212e5ae05e42492b23afef80ccaf69
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 #if LIBCURL_VERSION_NUM >= 0x071700
115 /* Use CURLOPT_KEYPASSWD as is */
116 #elif LIBCURL_VERSION_NUM >= 0x070903
117 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
118 #else
119 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
120 #endif
121
122 static struct credential cert_auth = CREDENTIAL_INIT;
123 static int ssl_cert_password_required;
124 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
125 static unsigned long http_auth_methods = CURLAUTH_ANY;
126 #endif
127
128 static struct curl_slist *pragma_header;
129 static struct curl_slist *no_pragma_header;
130 static struct curl_slist *extra_http_headers;
131
132 static struct active_request_slot *active_queue_head;
133
134 static char *cached_accept_language;
135
136 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
137 {
138 size_t size = eltsize * nmemb;
139 struct buffer *buffer = buffer_;
140
141 if (size > buffer->buf.len - buffer->posn)
142 size = buffer->buf.len - buffer->posn;
143 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
144 buffer->posn += size;
145
146 return size;
147 }
148
149 #ifndef NO_CURL_IOCTL
150 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
151 {
152 struct buffer *buffer = clientp;
153
154 switch (cmd) {
155 case CURLIOCMD_NOP:
156 return CURLIOE_OK;
157
158 case CURLIOCMD_RESTARTREAD:
159 buffer->posn = 0;
160 return CURLIOE_OK;
161
162 default:
163 return CURLIOE_UNKNOWNCMD;
164 }
165 }
166 #endif
167
168 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
169 {
170 size_t size = eltsize * nmemb;
171 struct strbuf *buffer = buffer_;
172
173 strbuf_add(buffer, ptr, size);
174 return size;
175 }
176
177 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
178 {
179 return eltsize * nmemb;
180 }
181
182 static void closedown_active_slot(struct active_request_slot *slot)
183 {
184 active_requests--;
185 slot->in_use = 0;
186 }
187
188 static void finish_active_slot(struct active_request_slot *slot)
189 {
190 closedown_active_slot(slot);
191 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
192
193 if (slot->finished != NULL)
194 (*slot->finished) = 1;
195
196 /* Store slot results so they can be read after the slot is reused */
197 if (slot->results != NULL) {
198 slot->results->curl_result = slot->curl_result;
199 slot->results->http_code = slot->http_code;
200 #if LIBCURL_VERSION_NUM >= 0x070a08
201 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
202 &slot->results->auth_avail);
203 #else
204 slot->results->auth_avail = 0;
205 #endif
206
207 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
208 &slot->results->http_connectcode);
209 }
210
211 /* Run callback if appropriate */
212 if (slot->callback_func != NULL)
213 slot->callback_func(slot->callback_data);
214 }
215
216 #ifdef USE_CURL_MULTI
217 static void process_curl_messages(void)
218 {
219 int num_messages;
220 struct active_request_slot *slot;
221 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
222
223 while (curl_message != NULL) {
224 if (curl_message->msg == CURLMSG_DONE) {
225 int curl_result = curl_message->data.result;
226 slot = active_queue_head;
227 while (slot != NULL &&
228 slot->curl != curl_message->easy_handle)
229 slot = slot->next;
230 if (slot != NULL) {
231 curl_multi_remove_handle(curlm, slot->curl);
232 slot->curl_result = curl_result;
233 finish_active_slot(slot);
234 } else {
235 fprintf(stderr, "Received DONE message for unknown request!\n");
236 }
237 } else {
238 fprintf(stderr, "Unknown CURL message received: %d\n",
239 (int)curl_message->msg);
240 }
241 curl_message = curl_multi_info_read(curlm, &num_messages);
242 }
243 }
244 #endif
245
246 static int http_options(const char *var, const char *value, void *cb)
247 {
248 if (!strcmp("http.sslverify", var)) {
249 curl_ssl_verify = git_config_bool(var, value);
250 return 0;
251 }
252 if (!strcmp("http.sslcipherlist", var))
253 return git_config_string(&ssl_cipherlist, var, value);
254 if (!strcmp("http.sslversion", var))
255 return git_config_string(&ssl_version, var, value);
256 if (!strcmp("http.sslcert", var))
257 return git_config_string(&ssl_cert, var, value);
258 #if LIBCURL_VERSION_NUM >= 0x070903
259 if (!strcmp("http.sslkey", var))
260 return git_config_string(&ssl_key, var, value);
261 #endif
262 #if LIBCURL_VERSION_NUM >= 0x070908
263 if (!strcmp("http.sslcapath", var))
264 return git_config_pathname(&ssl_capath, var, value);
265 #endif
266 if (!strcmp("http.sslcainfo", var))
267 return git_config_pathname(&ssl_cainfo, var, value);
268 if (!strcmp("http.sslcertpasswordprotected", var)) {
269 ssl_cert_password_required = git_config_bool(var, value);
270 return 0;
271 }
272 if (!strcmp("http.ssltry", var)) {
273 curl_ssl_try = git_config_bool(var, value);
274 return 0;
275 }
276 if (!strcmp("http.minsessions", var)) {
277 min_curl_sessions = git_config_int(var, value);
278 #ifndef USE_CURL_MULTI
279 if (min_curl_sessions > 1)
280 min_curl_sessions = 1;
281 #endif
282 return 0;
283 }
284 #ifdef USE_CURL_MULTI
285 if (!strcmp("http.maxrequests", var)) {
286 max_requests = git_config_int(var, value);
287 return 0;
288 }
289 #endif
290 if (!strcmp("http.lowspeedlimit", var)) {
291 curl_low_speed_limit = (long)git_config_int(var, value);
292 return 0;
293 }
294 if (!strcmp("http.lowspeedtime", var)) {
295 curl_low_speed_time = (long)git_config_int(var, value);
296 return 0;
297 }
298
299 if (!strcmp("http.noepsv", var)) {
300 curl_ftp_no_epsv = git_config_bool(var, value);
301 return 0;
302 }
303 if (!strcmp("http.proxy", var))
304 return git_config_string(&curl_http_proxy, var, value);
305
306 if (!strcmp("http.proxyauthmethod", var))
307 return git_config_string(&http_proxy_authmethod, var, value);
308
309 if (!strcmp("http.cookiefile", var))
310 return git_config_pathname(&curl_cookie_file, var, value);
311 if (!strcmp("http.savecookies", var)) {
312 curl_save_cookies = git_config_bool(var, value);
313 return 0;
314 }
315
316 if (!strcmp("http.postbuffer", var)) {
317 http_post_buffer = git_config_int(var, value);
318 if (http_post_buffer < LARGE_PACKET_MAX)
319 http_post_buffer = LARGE_PACKET_MAX;
320 return 0;
321 }
322
323 if (!strcmp("http.useragent", var))
324 return git_config_string(&user_agent, var, value);
325
326 if (!strcmp("http.emptyauth", var)) {
327 curl_empty_auth = git_config_bool(var, value);
328 return 0;
329 }
330
331 if (!strcmp("http.delegation", var)) {
332 #if LIBCURL_VERSION_NUM >= 0x071600
333 return git_config_string(&curl_deleg, var, value);
334 #else
335 warning(_("Delegation control is not supported with cURL < 7.22.0"));
336 return 0;
337 #endif
338 }
339
340 if (!strcmp("http.pinnedpubkey", var)) {
341 #if LIBCURL_VERSION_NUM >= 0x072c00
342 return git_config_pathname(&ssl_pinnedkey, var, value);
343 #else
344 warning(_("Public key pinning not supported with cURL < 7.44.0"));
345 return 0;
346 #endif
347 }
348
349 if (!strcmp("http.extraheader", var)) {
350 if (!value) {
351 return config_error_nonbool(var);
352 } else if (!*value) {
353 curl_slist_free_all(extra_http_headers);
354 extra_http_headers = NULL;
355 } else {
356 extra_http_headers =
357 curl_slist_append(extra_http_headers, value);
358 }
359 return 0;
360 }
361
362 /* Fall back on the default ones */
363 return git_default_config(var, value, cb);
364 }
365
366 static void init_curl_http_auth(CURL *result)
367 {
368 if (!http_auth.username) {
369 if (curl_empty_auth)
370 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
371 return;
372 }
373
374 credential_fill(&http_auth);
375
376 #if LIBCURL_VERSION_NUM >= 0x071301
377 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
378 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
379 #else
380 {
381 static struct strbuf up = STRBUF_INIT;
382 /*
383 * Note that we assume we only ever have a single set of
384 * credentials in a given program run, so we do not have
385 * to worry about updating this buffer, only setting its
386 * initial value.
387 */
388 if (!up.len)
389 strbuf_addf(&up, "%s:%s",
390 http_auth.username, http_auth.password);
391 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
392 }
393 #endif
394 }
395
396 /* *var must be free-able */
397 static void var_override(const char **var, char *value)
398 {
399 if (value) {
400 free((void *)*var);
401 *var = xstrdup(value);
402 }
403 }
404
405 static void set_proxyauth_name_password(CURL *result)
406 {
407 #if LIBCURL_VERSION_NUM >= 0x071301
408 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
409 proxy_auth.username);
410 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
411 proxy_auth.password);
412 #else
413 struct strbuf s = STRBUF_INIT;
414
415 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
416 strbuf_addch(&s, ':');
417 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
418 curl_proxyuserpwd = strbuf_detach(&s, NULL);
419 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
420 #endif
421 }
422
423 static void init_curl_proxy_auth(CURL *result)
424 {
425 if (proxy_auth.username) {
426 if (!proxy_auth.password)
427 credential_fill(&proxy_auth);
428 set_proxyauth_name_password(result);
429 }
430
431 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
432
433 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
434 if (http_proxy_authmethod) {
435 int i;
436 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
437 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
438 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
439 proxy_authmethods[i].curlauth_param);
440 break;
441 }
442 }
443 if (i == ARRAY_SIZE(proxy_authmethods)) {
444 warning("unsupported proxy authentication method %s: using anyauth",
445 http_proxy_authmethod);
446 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
447 }
448 }
449 else
450 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
451 #endif
452 }
453
454 static int has_cert_password(void)
455 {
456 if (ssl_cert == NULL || ssl_cert_password_required != 1)
457 return 0;
458 if (!cert_auth.password) {
459 cert_auth.protocol = xstrdup("cert");
460 cert_auth.username = xstrdup("");
461 cert_auth.path = xstrdup(ssl_cert);
462 credential_fill(&cert_auth);
463 }
464 return 1;
465 }
466
467 #if LIBCURL_VERSION_NUM >= 0x071900
468 static void set_curl_keepalive(CURL *c)
469 {
470 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
471 }
472
473 #elif LIBCURL_VERSION_NUM >= 0x071000
474 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
475 {
476 int ka = 1;
477 int rc;
478 socklen_t len = (socklen_t)sizeof(ka);
479
480 if (type != CURLSOCKTYPE_IPCXN)
481 return 0;
482
483 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
484 if (rc < 0)
485 warning_errno("unable to set SO_KEEPALIVE on socket");
486
487 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
488 }
489
490 static void set_curl_keepalive(CURL *c)
491 {
492 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
493 }
494
495 #else
496 static void set_curl_keepalive(CURL *c)
497 {
498 /* not supported on older curl versions */
499 }
500 #endif
501
502 static void redact_sensitive_header(struct strbuf *header)
503 {
504 const char *sensitive_header;
505
506 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
507 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
508 /* The first token is the type, which is OK to log */
509 while (isspace(*sensitive_header))
510 sensitive_header++;
511 while (*sensitive_header && !isspace(*sensitive_header))
512 sensitive_header++;
513 /* Everything else is opaque and possibly sensitive */
514 strbuf_setlen(header, sensitive_header - header->buf);
515 strbuf_addstr(header, " <redacted>");
516 }
517 }
518
519 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
520 {
521 struct strbuf out = STRBUF_INIT;
522 struct strbuf **headers, **header;
523
524 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
525 text, (long)size, (long)size);
526 trace_strbuf(&trace_curl, &out);
527 strbuf_reset(&out);
528 strbuf_add(&out, ptr, size);
529 headers = strbuf_split_max(&out, '\n', 0);
530
531 for (header = headers; *header; header++) {
532 if (hide_sensitive_header)
533 redact_sensitive_header(*header);
534 strbuf_insert((*header), 0, text, strlen(text));
535 strbuf_insert((*header), strlen(text), ": ", 2);
536 strbuf_rtrim((*header));
537 strbuf_addch((*header), '\n');
538 trace_strbuf(&trace_curl, (*header));
539 }
540 strbuf_list_free(headers);
541 strbuf_release(&out);
542 }
543
544 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
545 {
546 size_t i;
547 struct strbuf out = STRBUF_INIT;
548 unsigned int width = 60;
549
550 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
551 text, (long)size, (long)size);
552 trace_strbuf(&trace_curl, &out);
553
554 for (i = 0; i < size; i += width) {
555 size_t w;
556
557 strbuf_reset(&out);
558 strbuf_addf(&out, "%s: ", text);
559 for (w = 0; (w < width) && (i + w < size); w++) {
560 unsigned char ch = ptr[i + w];
561
562 strbuf_addch(&out,
563 (ch >= 0x20) && (ch < 0x80)
564 ? ch : '.');
565 }
566 strbuf_addch(&out, '\n');
567 trace_strbuf(&trace_curl, &out);
568 }
569 strbuf_release(&out);
570 }
571
572 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
573 {
574 const char *text;
575 enum { NO_FILTER = 0, DO_FILTER = 1 };
576
577 switch (type) {
578 case CURLINFO_TEXT:
579 trace_printf_key(&trace_curl, "== Info: %s", data);
580 default: /* we ignore unknown types by default */
581 return 0;
582
583 case CURLINFO_HEADER_OUT:
584 text = "=> Send header";
585 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
586 break;
587 case CURLINFO_DATA_OUT:
588 text = "=> Send data";
589 curl_dump_data(text, (unsigned char *)data, size);
590 break;
591 case CURLINFO_SSL_DATA_OUT:
592 text = "=> Send SSL data";
593 curl_dump_data(text, (unsigned char *)data, size);
594 break;
595 case CURLINFO_HEADER_IN:
596 text = "<= Recv header";
597 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
598 break;
599 case CURLINFO_DATA_IN:
600 text = "<= Recv data";
601 curl_dump_data(text, (unsigned char *)data, size);
602 break;
603 case CURLINFO_SSL_DATA_IN:
604 text = "<= Recv SSL data";
605 curl_dump_data(text, (unsigned char *)data, size);
606 break;
607 }
608 return 0;
609 }
610
611 void setup_curl_trace(CURL *handle)
612 {
613 if (!trace_want(&trace_curl))
614 return;
615 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
616 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
617 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
618 }
619
620
621 static CURL *get_curl_handle(void)
622 {
623 CURL *result = curl_easy_init();
624 long allowed_protocols = 0;
625
626 if (!result)
627 die("curl_easy_init failed");
628
629 if (!curl_ssl_verify) {
630 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
631 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
632 } else {
633 /* Verify authenticity of the peer's certificate */
634 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
635 /* The name in the cert must match whom we tried to connect */
636 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
637 }
638
639 #if LIBCURL_VERSION_NUM >= 0x070907
640 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
641 #endif
642 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
643 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
644 #endif
645
646 #if LIBCURL_VERSION_NUM >= 0x071600
647 if (curl_deleg) {
648 int i;
649 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
650 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
651 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
652 curl_deleg_levels[i].curl_deleg_param);
653 break;
654 }
655 }
656 if (i == ARRAY_SIZE(curl_deleg_levels))
657 warning("Unknown delegation method '%s': using default",
658 curl_deleg);
659 }
660 #endif
661
662 if (http_proactive_auth)
663 init_curl_http_auth(result);
664
665 if (getenv("GIT_SSL_VERSION"))
666 ssl_version = getenv("GIT_SSL_VERSION");
667 if (ssl_version && *ssl_version) {
668 int i;
669 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
670 if (!strcmp(ssl_version, sslversions[i].name)) {
671 curl_easy_setopt(result, CURLOPT_SSLVERSION,
672 sslversions[i].ssl_version);
673 break;
674 }
675 }
676 if (i == ARRAY_SIZE(sslversions))
677 warning("unsupported ssl version %s: using default",
678 ssl_version);
679 }
680
681 if (getenv("GIT_SSL_CIPHER_LIST"))
682 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
683 if (ssl_cipherlist != NULL && *ssl_cipherlist)
684 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
685 ssl_cipherlist);
686
687 if (ssl_cert != NULL)
688 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
689 if (has_cert_password())
690 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
691 #if LIBCURL_VERSION_NUM >= 0x070903
692 if (ssl_key != NULL)
693 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
694 #endif
695 #if LIBCURL_VERSION_NUM >= 0x070908
696 if (ssl_capath != NULL)
697 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
698 #endif
699 #if LIBCURL_VERSION_NUM >= 0x072c00
700 if (ssl_pinnedkey != NULL)
701 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
702 #endif
703 if (ssl_cainfo != NULL)
704 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
705
706 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
707 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
708 curl_low_speed_limit);
709 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
710 curl_low_speed_time);
711 }
712
713 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
714 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
715 #if LIBCURL_VERSION_NUM >= 0x071301
716 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
717 #elif LIBCURL_VERSION_NUM >= 0x071101
718 curl_easy_setopt(result, CURLOPT_POST301, 1);
719 #endif
720 #if LIBCURL_VERSION_NUM >= 0x071304
721 if (is_transport_allowed("http"))
722 allowed_protocols |= CURLPROTO_HTTP;
723 if (is_transport_allowed("https"))
724 allowed_protocols |= CURLPROTO_HTTPS;
725 if (is_transport_allowed("ftp"))
726 allowed_protocols |= CURLPROTO_FTP;
727 if (is_transport_allowed("ftps"))
728 allowed_protocols |= CURLPROTO_FTPS;
729 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
730 #else
731 if (transport_restrict_protocols())
732 warning("protocol restrictions not applied to curl redirects because\n"
733 "your curl version is too old (>= 7.19.4)");
734 #endif
735 if (getenv("GIT_CURL_VERBOSE"))
736 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
737 setup_curl_trace(result);
738
739 curl_easy_setopt(result, CURLOPT_USERAGENT,
740 user_agent ? user_agent : git_user_agent());
741
742 if (curl_ftp_no_epsv)
743 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
744
745 #ifdef CURLOPT_USE_SSL
746 if (curl_ssl_try)
747 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
748 #endif
749
750 /*
751 * CURL also examines these variables as a fallback; but we need to query
752 * them here in order to decide whether to prompt for missing password (cf.
753 * init_curl_proxy_auth()).
754 *
755 * Unlike many other common environment variables, these are historically
756 * lowercase only. It appears that CURL did not know this and implemented
757 * only uppercase variants, which was later corrected to take both - with
758 * the exception of http_proxy, which is lowercase only also in CURL. As
759 * the lowercase versions are the historical quasi-standard, they take
760 * precedence here, as in CURL.
761 */
762 if (!curl_http_proxy) {
763 if (!strcmp(http_auth.protocol, "https")) {
764 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
765 var_override(&curl_http_proxy, getenv("https_proxy"));
766 } else {
767 var_override(&curl_http_proxy, getenv("http_proxy"));
768 }
769 if (!curl_http_proxy) {
770 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
771 var_override(&curl_http_proxy, getenv("all_proxy"));
772 }
773 }
774
775 if (curl_http_proxy) {
776 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
777 #if LIBCURL_VERSION_NUM >= 0x071800
778 if (starts_with(curl_http_proxy, "socks5h"))
779 curl_easy_setopt(result,
780 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
781 else if (starts_with(curl_http_proxy, "socks5"))
782 curl_easy_setopt(result,
783 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
784 else if (starts_with(curl_http_proxy, "socks4a"))
785 curl_easy_setopt(result,
786 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
787 else if (starts_with(curl_http_proxy, "socks"))
788 curl_easy_setopt(result,
789 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
790 #endif
791 if (strstr(curl_http_proxy, "://"))
792 credential_from_url(&proxy_auth, curl_http_proxy);
793 else {
794 struct strbuf url = STRBUF_INIT;
795 strbuf_addf(&url, "http://%s", curl_http_proxy);
796 credential_from_url(&proxy_auth, url.buf);
797 strbuf_release(&url);
798 }
799
800 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
801 #if LIBCURL_VERSION_NUM >= 0x071304
802 var_override(&curl_no_proxy, getenv("NO_PROXY"));
803 var_override(&curl_no_proxy, getenv("no_proxy"));
804 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
805 #endif
806 }
807 init_curl_proxy_auth(result);
808
809 set_curl_keepalive(result);
810
811 return result;
812 }
813
814 static void set_from_env(const char **var, const char *envname)
815 {
816 const char *val = getenv(envname);
817 if (val)
818 *var = val;
819 }
820
821 void http_init(struct remote *remote, const char *url, int proactive_auth)
822 {
823 char *low_speed_limit;
824 char *low_speed_time;
825 char *normalized_url;
826 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
827
828 config.section = "http";
829 config.key = NULL;
830 config.collect_fn = http_options;
831 config.cascade_fn = git_default_config;
832 config.cb = NULL;
833
834 http_is_verbose = 0;
835 normalized_url = url_normalize(url, &config.url);
836
837 git_config(urlmatch_config_entry, &config);
838 free(normalized_url);
839
840 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
841 die("curl_global_init failed");
842
843 http_proactive_auth = proactive_auth;
844
845 if (remote && remote->http_proxy)
846 curl_http_proxy = xstrdup(remote->http_proxy);
847
848 if (remote)
849 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
850
851 pragma_header = curl_slist_append(http_copy_default_headers(),
852 "Pragma: no-cache");
853 no_pragma_header = curl_slist_append(http_copy_default_headers(),
854 "Pragma:");
855
856 #ifdef USE_CURL_MULTI
857 {
858 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
859 if (http_max_requests != NULL)
860 max_requests = atoi(http_max_requests);
861 }
862
863 curlm = curl_multi_init();
864 if (!curlm)
865 die("curl_multi_init failed");
866 #endif
867
868 if (getenv("GIT_SSL_NO_VERIFY"))
869 curl_ssl_verify = 0;
870
871 set_from_env(&ssl_cert, "GIT_SSL_CERT");
872 #if LIBCURL_VERSION_NUM >= 0x070903
873 set_from_env(&ssl_key, "GIT_SSL_KEY");
874 #endif
875 #if LIBCURL_VERSION_NUM >= 0x070908
876 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
877 #endif
878 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
879
880 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
881
882 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
883 if (low_speed_limit != NULL)
884 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
885 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
886 if (low_speed_time != NULL)
887 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
888
889 if (curl_ssl_verify == -1)
890 curl_ssl_verify = 1;
891
892 curl_session_count = 0;
893 #ifdef USE_CURL_MULTI
894 if (max_requests < 1)
895 max_requests = DEFAULT_MAX_REQUESTS;
896 #endif
897
898 if (getenv("GIT_CURL_FTP_NO_EPSV"))
899 curl_ftp_no_epsv = 1;
900
901 if (url) {
902 credential_from_url(&http_auth, url);
903 if (!ssl_cert_password_required &&
904 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
905 starts_with(url, "https://"))
906 ssl_cert_password_required = 1;
907 }
908
909 #ifndef NO_CURL_EASY_DUPHANDLE
910 curl_default = get_curl_handle();
911 #endif
912 }
913
914 void http_cleanup(void)
915 {
916 struct active_request_slot *slot = active_queue_head;
917
918 while (slot != NULL) {
919 struct active_request_slot *next = slot->next;
920 if (slot->curl != NULL) {
921 #ifdef USE_CURL_MULTI
922 curl_multi_remove_handle(curlm, slot->curl);
923 #endif
924 curl_easy_cleanup(slot->curl);
925 }
926 free(slot);
927 slot = next;
928 }
929 active_queue_head = NULL;
930
931 #ifndef NO_CURL_EASY_DUPHANDLE
932 curl_easy_cleanup(curl_default);
933 #endif
934
935 #ifdef USE_CURL_MULTI
936 curl_multi_cleanup(curlm);
937 #endif
938 curl_global_cleanup();
939
940 curl_slist_free_all(extra_http_headers);
941 extra_http_headers = NULL;
942
943 curl_slist_free_all(pragma_header);
944 pragma_header = NULL;
945
946 curl_slist_free_all(no_pragma_header);
947 no_pragma_header = NULL;
948
949 if (curl_http_proxy) {
950 free((void *)curl_http_proxy);
951 curl_http_proxy = NULL;
952 }
953
954 if (proxy_auth.password) {
955 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
956 free(proxy_auth.password);
957 proxy_auth.password = NULL;
958 }
959
960 free((void *)curl_proxyuserpwd);
961 curl_proxyuserpwd = NULL;
962
963 free((void *)http_proxy_authmethod);
964 http_proxy_authmethod = NULL;
965
966 if (cert_auth.password != NULL) {
967 memset(cert_auth.password, 0, strlen(cert_auth.password));
968 free(cert_auth.password);
969 cert_auth.password = NULL;
970 }
971 ssl_cert_password_required = 0;
972
973 free(cached_accept_language);
974 cached_accept_language = NULL;
975 }
976
977 struct active_request_slot *get_active_slot(void)
978 {
979 struct active_request_slot *slot = active_queue_head;
980 struct active_request_slot *newslot;
981
982 #ifdef USE_CURL_MULTI
983 int num_transfers;
984
985 /* Wait for a slot to open up if the queue is full */
986 while (active_requests >= max_requests) {
987 curl_multi_perform(curlm, &num_transfers);
988 if (num_transfers < active_requests)
989 process_curl_messages();
990 }
991 #endif
992
993 while (slot != NULL && slot->in_use)
994 slot = slot->next;
995
996 if (slot == NULL) {
997 newslot = xmalloc(sizeof(*newslot));
998 newslot->curl = NULL;
999 newslot->in_use = 0;
1000 newslot->next = NULL;
1001
1002 slot = active_queue_head;
1003 if (slot == NULL) {
1004 active_queue_head = newslot;
1005 } else {
1006 while (slot->next != NULL)
1007 slot = slot->next;
1008 slot->next = newslot;
1009 }
1010 slot = newslot;
1011 }
1012
1013 if (slot->curl == NULL) {
1014 #ifdef NO_CURL_EASY_DUPHANDLE
1015 slot->curl = get_curl_handle();
1016 #else
1017 slot->curl = curl_easy_duphandle(curl_default);
1018 #endif
1019 curl_session_count++;
1020 }
1021
1022 active_requests++;
1023 slot->in_use = 1;
1024 slot->results = NULL;
1025 slot->finished = NULL;
1026 slot->callback_data = NULL;
1027 slot->callback_func = NULL;
1028 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1029 if (curl_save_cookies)
1030 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1031 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1032 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1033 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1034 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1035 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1036 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1037 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1038 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1039 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1040 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1041
1042 #if LIBCURL_VERSION_NUM >= 0x070a08
1043 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1044 #endif
1045 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1046 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1047 #endif
1048 if (http_auth.password || curl_empty_auth)
1049 init_curl_http_auth(slot->curl);
1050
1051 return slot;
1052 }
1053
1054 int start_active_slot(struct active_request_slot *slot)
1055 {
1056 #ifdef USE_CURL_MULTI
1057 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1058 int num_transfers;
1059
1060 if (curlm_result != CURLM_OK &&
1061 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1062 active_requests--;
1063 slot->in_use = 0;
1064 return 0;
1065 }
1066
1067 /*
1068 * We know there must be something to do, since we just added
1069 * something.
1070 */
1071 curl_multi_perform(curlm, &num_transfers);
1072 #endif
1073 return 1;
1074 }
1075
1076 #ifdef USE_CURL_MULTI
1077 struct fill_chain {
1078 void *data;
1079 int (*fill)(void *);
1080 struct fill_chain *next;
1081 };
1082
1083 static struct fill_chain *fill_cfg;
1084
1085 void add_fill_function(void *data, int (*fill)(void *))
1086 {
1087 struct fill_chain *new = xmalloc(sizeof(*new));
1088 struct fill_chain **linkp = &fill_cfg;
1089 new->data = data;
1090 new->fill = fill;
1091 new->next = NULL;
1092 while (*linkp)
1093 linkp = &(*linkp)->next;
1094 *linkp = new;
1095 }
1096
1097 void fill_active_slots(void)
1098 {
1099 struct active_request_slot *slot = active_queue_head;
1100
1101 while (active_requests < max_requests) {
1102 struct fill_chain *fill;
1103 for (fill = fill_cfg; fill; fill = fill->next)
1104 if (fill->fill(fill->data))
1105 break;
1106
1107 if (!fill)
1108 break;
1109 }
1110
1111 while (slot != NULL) {
1112 if (!slot->in_use && slot->curl != NULL
1113 && curl_session_count > min_curl_sessions) {
1114 curl_easy_cleanup(slot->curl);
1115 slot->curl = NULL;
1116 curl_session_count--;
1117 }
1118 slot = slot->next;
1119 }
1120 }
1121
1122 void step_active_slots(void)
1123 {
1124 int num_transfers;
1125 CURLMcode curlm_result;
1126
1127 do {
1128 curlm_result = curl_multi_perform(curlm, &num_transfers);
1129 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1130 if (num_transfers < active_requests) {
1131 process_curl_messages();
1132 fill_active_slots();
1133 }
1134 }
1135 #endif
1136
1137 void run_active_slot(struct active_request_slot *slot)
1138 {
1139 #ifdef USE_CURL_MULTI
1140 fd_set readfds;
1141 fd_set writefds;
1142 fd_set excfds;
1143 int max_fd;
1144 struct timeval select_timeout;
1145 int finished = 0;
1146
1147 slot->finished = &finished;
1148 while (!finished) {
1149 step_active_slots();
1150
1151 if (slot->in_use) {
1152 #if LIBCURL_VERSION_NUM >= 0x070f04
1153 long curl_timeout;
1154 curl_multi_timeout(curlm, &curl_timeout);
1155 if (curl_timeout == 0) {
1156 continue;
1157 } else if (curl_timeout == -1) {
1158 select_timeout.tv_sec = 0;
1159 select_timeout.tv_usec = 50000;
1160 } else {
1161 select_timeout.tv_sec = curl_timeout / 1000;
1162 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1163 }
1164 #else
1165 select_timeout.tv_sec = 0;
1166 select_timeout.tv_usec = 50000;
1167 #endif
1168
1169 max_fd = -1;
1170 FD_ZERO(&readfds);
1171 FD_ZERO(&writefds);
1172 FD_ZERO(&excfds);
1173 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1174
1175 /*
1176 * It can happen that curl_multi_timeout returns a pathologically
1177 * long timeout when curl_multi_fdset returns no file descriptors
1178 * to read. See commit message for more details.
1179 */
1180 if (max_fd < 0 &&
1181 (select_timeout.tv_sec > 0 ||
1182 select_timeout.tv_usec > 50000)) {
1183 select_timeout.tv_sec = 0;
1184 select_timeout.tv_usec = 50000;
1185 }
1186
1187 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1188 }
1189 }
1190 #else
1191 while (slot->in_use) {
1192 slot->curl_result = curl_easy_perform(slot->curl);
1193 finish_active_slot(slot);
1194 }
1195 #endif
1196 }
1197
1198 static void release_active_slot(struct active_request_slot *slot)
1199 {
1200 closedown_active_slot(slot);
1201 if (slot->curl && curl_session_count > min_curl_sessions) {
1202 #ifdef USE_CURL_MULTI
1203 curl_multi_remove_handle(curlm, slot->curl);
1204 #endif
1205 curl_easy_cleanup(slot->curl);
1206 slot->curl = NULL;
1207 curl_session_count--;
1208 }
1209 #ifdef USE_CURL_MULTI
1210 fill_active_slots();
1211 #endif
1212 }
1213
1214 void finish_all_active_slots(void)
1215 {
1216 struct active_request_slot *slot = active_queue_head;
1217
1218 while (slot != NULL)
1219 if (slot->in_use) {
1220 run_active_slot(slot);
1221 slot = active_queue_head;
1222 } else {
1223 slot = slot->next;
1224 }
1225 }
1226
1227 /* Helpers for modifying and creating URLs */
1228 static inline int needs_quote(int ch)
1229 {
1230 if (((ch >= 'A') && (ch <= 'Z'))
1231 || ((ch >= 'a') && (ch <= 'z'))
1232 || ((ch >= '0') && (ch <= '9'))
1233 || (ch == '/')
1234 || (ch == '-')
1235 || (ch == '.'))
1236 return 0;
1237 return 1;
1238 }
1239
1240 static char *quote_ref_url(const char *base, const char *ref)
1241 {
1242 struct strbuf buf = STRBUF_INIT;
1243 const char *cp;
1244 int ch;
1245
1246 end_url_with_slash(&buf, base);
1247
1248 for (cp = ref; (ch = *cp) != 0; cp++)
1249 if (needs_quote(ch))
1250 strbuf_addf(&buf, "%%%02x", ch);
1251 else
1252 strbuf_addch(&buf, *cp);
1253
1254 return strbuf_detach(&buf, NULL);
1255 }
1256
1257 void append_remote_object_url(struct strbuf *buf, const char *url,
1258 const char *hex,
1259 int only_two_digit_prefix)
1260 {
1261 end_url_with_slash(buf, url);
1262
1263 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1264 if (!only_two_digit_prefix)
1265 strbuf_addstr(buf, hex + 2);
1266 }
1267
1268 char *get_remote_object_url(const char *url, const char *hex,
1269 int only_two_digit_prefix)
1270 {
1271 struct strbuf buf = STRBUF_INIT;
1272 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1273 return strbuf_detach(&buf, NULL);
1274 }
1275
1276 static int handle_curl_result(struct slot_results *results)
1277 {
1278 /*
1279 * If we see a failing http code with CURLE_OK, we have turned off
1280 * FAILONERROR (to keep the server's custom error response), and should
1281 * translate the code into failure here.
1282 */
1283 if (results->curl_result == CURLE_OK &&
1284 results->http_code >= 400) {
1285 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1286 /*
1287 * Normally curl will already have put the "reason phrase"
1288 * from the server into curl_errorstr; unfortunately without
1289 * FAILONERROR it is lost, so we can give only the numeric
1290 * status code.
1291 */
1292 snprintf(curl_errorstr, sizeof(curl_errorstr),
1293 "The requested URL returned error: %ld",
1294 results->http_code);
1295 }
1296
1297 if (results->curl_result == CURLE_OK) {
1298 credential_approve(&http_auth);
1299 if (proxy_auth.password)
1300 credential_approve(&proxy_auth);
1301 return HTTP_OK;
1302 } else if (missing_target(results))
1303 return HTTP_MISSING_TARGET;
1304 else if (results->http_code == 401) {
1305 if (http_auth.username && http_auth.password) {
1306 credential_reject(&http_auth);
1307 return HTTP_NOAUTH;
1308 } else {
1309 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1310 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1311 #endif
1312 return HTTP_REAUTH;
1313 }
1314 } else {
1315 if (results->http_connectcode == 407)
1316 credential_reject(&proxy_auth);
1317 #if LIBCURL_VERSION_NUM >= 0x070c00
1318 if (!curl_errorstr[0])
1319 strlcpy(curl_errorstr,
1320 curl_easy_strerror(results->curl_result),
1321 sizeof(curl_errorstr));
1322 #endif
1323 return HTTP_ERROR;
1324 }
1325 }
1326
1327 int run_one_slot(struct active_request_slot *slot,
1328 struct slot_results *results)
1329 {
1330 slot->results = results;
1331 if (!start_active_slot(slot)) {
1332 snprintf(curl_errorstr, sizeof(curl_errorstr),
1333 "failed to start HTTP request");
1334 return HTTP_START_FAILED;
1335 }
1336
1337 run_active_slot(slot);
1338 return handle_curl_result(results);
1339 }
1340
1341 struct curl_slist *http_copy_default_headers(void)
1342 {
1343 struct curl_slist *headers = NULL, *h;
1344
1345 for (h = extra_http_headers; h; h = h->next)
1346 headers = curl_slist_append(headers, h->data);
1347
1348 return headers;
1349 }
1350
1351 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1352 {
1353 char *ptr;
1354 CURLcode ret;
1355
1356 strbuf_reset(buf);
1357 ret = curl_easy_getinfo(curl, info, &ptr);
1358 if (!ret && ptr)
1359 strbuf_addstr(buf, ptr);
1360 return ret;
1361 }
1362
1363 /*
1364 * Check for and extract a content-type parameter. "raw"
1365 * should be positioned at the start of the potential
1366 * parameter, with any whitespace already removed.
1367 *
1368 * "name" is the name of the parameter. The value is appended
1369 * to "out".
1370 */
1371 static int extract_param(const char *raw, const char *name,
1372 struct strbuf *out)
1373 {
1374 size_t len = strlen(name);
1375
1376 if (strncasecmp(raw, name, len))
1377 return -1;
1378 raw += len;
1379
1380 if (*raw != '=')
1381 return -1;
1382 raw++;
1383
1384 while (*raw && !isspace(*raw) && *raw != ';')
1385 strbuf_addch(out, *raw++);
1386 return 0;
1387 }
1388
1389 /*
1390 * Extract a normalized version of the content type, with any
1391 * spaces suppressed, all letters lowercased, and no trailing ";"
1392 * or parameters.
1393 *
1394 * Note that we will silently remove even invalid whitespace. For
1395 * example, "text / plain" is specifically forbidden by RFC 2616,
1396 * but "text/plain" is the only reasonable output, and this keeps
1397 * our code simple.
1398 *
1399 * If the "charset" argument is not NULL, store the value of any
1400 * charset parameter there.
1401 *
1402 * Example:
1403 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1404 * "text / plain" -> "text/plain"
1405 */
1406 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1407 struct strbuf *charset)
1408 {
1409 const char *p;
1410
1411 strbuf_reset(type);
1412 strbuf_grow(type, raw->len);
1413 for (p = raw->buf; *p; p++) {
1414 if (isspace(*p))
1415 continue;
1416 if (*p == ';') {
1417 p++;
1418 break;
1419 }
1420 strbuf_addch(type, tolower(*p));
1421 }
1422
1423 if (!charset)
1424 return;
1425
1426 strbuf_reset(charset);
1427 while (*p) {
1428 while (isspace(*p) || *p == ';')
1429 p++;
1430 if (!extract_param(p, "charset", charset))
1431 return;
1432 while (*p && !isspace(*p))
1433 p++;
1434 }
1435
1436 if (!charset->len && starts_with(type->buf, "text/"))
1437 strbuf_addstr(charset, "ISO-8859-1");
1438 }
1439
1440 static void write_accept_language(struct strbuf *buf)
1441 {
1442 /*
1443 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1444 * that, q-value will be smaller than 0.001, the minimum q-value the
1445 * HTTP specification allows. See
1446 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1447 */
1448 const int MAX_DECIMAL_PLACES = 3;
1449 const int MAX_LANGUAGE_TAGS = 1000;
1450 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1451 char **language_tags = NULL;
1452 int num_langs = 0;
1453 const char *s = get_preferred_languages();
1454 int i;
1455 struct strbuf tag = STRBUF_INIT;
1456
1457 /* Don't add Accept-Language header if no language is preferred. */
1458 if (!s)
1459 return;
1460
1461 /*
1462 * Split the colon-separated string of preferred languages into
1463 * language_tags array.
1464 */
1465 do {
1466 /* collect language tag */
1467 for (; *s && (isalnum(*s) || *s == '_'); s++)
1468 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1469
1470 /* skip .codeset, @modifier and any other unnecessary parts */
1471 while (*s && *s != ':')
1472 s++;
1473
1474 if (tag.len) {
1475 num_langs++;
1476 REALLOC_ARRAY(language_tags, num_langs);
1477 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1478 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1479 break;
1480 }
1481 } while (*s++);
1482
1483 /* write Accept-Language header into buf */
1484 if (num_langs) {
1485 int last_buf_len = 0;
1486 int max_q;
1487 int decimal_places;
1488 char q_format[32];
1489
1490 /* add '*' */
1491 REALLOC_ARRAY(language_tags, num_langs + 1);
1492 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1493
1494 /* compute decimal_places */
1495 for (max_q = 1, decimal_places = 0;
1496 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1497 decimal_places++, max_q *= 10)
1498 ;
1499
1500 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1501
1502 strbuf_addstr(buf, "Accept-Language: ");
1503
1504 for (i = 0; i < num_langs; i++) {
1505 if (i > 0)
1506 strbuf_addstr(buf, ", ");
1507
1508 strbuf_addstr(buf, language_tags[i]);
1509
1510 if (i > 0)
1511 strbuf_addf(buf, q_format, max_q - i);
1512
1513 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1514 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1515 break;
1516 }
1517
1518 last_buf_len = buf->len;
1519 }
1520 }
1521
1522 /* free language tags -- last one is a static '*' */
1523 for (i = 0; i < num_langs - 1; i++)
1524 free(language_tags[i]);
1525 free(language_tags);
1526 }
1527
1528 /*
1529 * Get an Accept-Language header which indicates user's preferred languages.
1530 *
1531 * Examples:
1532 * LANGUAGE= -> ""
1533 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1534 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1535 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1536 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1537 * LANGUAGE= LANG=C -> ""
1538 */
1539 static const char *get_accept_language(void)
1540 {
1541 if (!cached_accept_language) {
1542 struct strbuf buf = STRBUF_INIT;
1543 write_accept_language(&buf);
1544 if (buf.len > 0)
1545 cached_accept_language = strbuf_detach(&buf, NULL);
1546 }
1547
1548 return cached_accept_language;
1549 }
1550
1551 static void http_opt_request_remainder(CURL *curl, off_t pos)
1552 {
1553 char buf[128];
1554 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1555 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1556 }
1557
1558 /* http_request() targets */
1559 #define HTTP_REQUEST_STRBUF 0
1560 #define HTTP_REQUEST_FILE 1
1561
1562 static int http_request(const char *url,
1563 void *result, int target,
1564 const struct http_get_options *options)
1565 {
1566 struct active_request_slot *slot;
1567 struct slot_results results;
1568 struct curl_slist *headers = http_copy_default_headers();
1569 struct strbuf buf = STRBUF_INIT;
1570 const char *accept_language;
1571 int ret;
1572
1573 slot = get_active_slot();
1574 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1575
1576 if (result == NULL) {
1577 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1578 } else {
1579 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1580 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1581
1582 if (target == HTTP_REQUEST_FILE) {
1583 off_t posn = ftello(result);
1584 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1585 fwrite);
1586 if (posn > 0)
1587 http_opt_request_remainder(slot->curl, posn);
1588 } else
1589 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1590 fwrite_buffer);
1591 }
1592
1593 accept_language = get_accept_language();
1594
1595 if (accept_language)
1596 headers = curl_slist_append(headers, accept_language);
1597
1598 strbuf_addstr(&buf, "Pragma:");
1599 if (options && options->no_cache)
1600 strbuf_addstr(&buf, " no-cache");
1601 if (options && options->keep_error)
1602 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1603
1604 headers = curl_slist_append(headers, buf.buf);
1605
1606 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1607 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1608 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1609
1610 ret = run_one_slot(slot, &results);
1611
1612 if (options && options->content_type) {
1613 struct strbuf raw = STRBUF_INIT;
1614 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1615 extract_content_type(&raw, options->content_type,
1616 options->charset);
1617 strbuf_release(&raw);
1618 }
1619
1620 if (options && options->effective_url)
1621 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1622 options->effective_url);
1623
1624 curl_slist_free_all(headers);
1625 strbuf_release(&buf);
1626
1627 return ret;
1628 }
1629
1630 /*
1631 * Update the "base" url to a more appropriate value, as deduced by
1632 * redirects seen when requesting a URL starting with "url".
1633 *
1634 * The "asked" parameter is a URL that we asked curl to access, and must begin
1635 * with "base".
1636 *
1637 * The "got" parameter is the URL that curl reported to us as where we ended
1638 * up.
1639 *
1640 * Returns 1 if we updated the base url, 0 otherwise.
1641 *
1642 * Our basic strategy is to compare "base" and "asked" to find the bits
1643 * specific to our request. We then strip those bits off of "got" to yield the
1644 * new base. So for example, if our base is "http://example.com/foo.git",
1645 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1646 * with "https://other.example.com/foo.git/info/refs". We would want the
1647 * new URL to become "https://other.example.com/foo.git".
1648 *
1649 * Note that this assumes a sane redirect scheme. It's entirely possible
1650 * in the example above to end up at a URL that does not even end in
1651 * "info/refs". In such a case we simply punt, as there is not much we can
1652 * do (and such a scheme is unlikely to represent a real git repository,
1653 * which means we are likely about to abort anyway).
1654 */
1655 static int update_url_from_redirect(struct strbuf *base,
1656 const char *asked,
1657 const struct strbuf *got)
1658 {
1659 const char *tail;
1660 size_t tail_len;
1661
1662 if (!strcmp(asked, got->buf))
1663 return 0;
1664
1665 if (!skip_prefix(asked, base->buf, &tail))
1666 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1667 asked, base->buf);
1668
1669 tail_len = strlen(tail);
1670
1671 if (got->len < tail_len ||
1672 strcmp(tail, got->buf + got->len - tail_len))
1673 return 0; /* insane redirect scheme */
1674
1675 strbuf_reset(base);
1676 strbuf_add(base, got->buf, got->len - tail_len);
1677 return 1;
1678 }
1679
1680 static int http_request_reauth(const char *url,
1681 void *result, int target,
1682 struct http_get_options *options)
1683 {
1684 int ret = http_request(url, result, target, options);
1685
1686 if (options && options->effective_url && options->base_url) {
1687 if (update_url_from_redirect(options->base_url,
1688 url, options->effective_url)) {
1689 credential_from_url(&http_auth, options->base_url->buf);
1690 url = options->effective_url->buf;
1691 }
1692 }
1693
1694 if (ret != HTTP_REAUTH)
1695 return ret;
1696
1697 /*
1698 * If we are using KEEP_ERROR, the previous request may have
1699 * put cruft into our output stream; we should clear it out before
1700 * making our next request. We only know how to do this for
1701 * the strbuf case, but that is enough to satisfy current callers.
1702 */
1703 if (options && options->keep_error) {
1704 switch (target) {
1705 case HTTP_REQUEST_STRBUF:
1706 strbuf_reset(result);
1707 break;
1708 default:
1709 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1710 }
1711 }
1712
1713 credential_fill(&http_auth);
1714
1715 return http_request(url, result, target, options);
1716 }
1717
1718 int http_get_strbuf(const char *url,
1719 struct strbuf *result,
1720 struct http_get_options *options)
1721 {
1722 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1723 }
1724
1725 /*
1726 * Downloads a URL and stores the result in the given file.
1727 *
1728 * If a previous interrupted download is detected (i.e. a previous temporary
1729 * file is still around) the download is resumed.
1730 */
1731 static int http_get_file(const char *url, const char *filename,
1732 struct http_get_options *options)
1733 {
1734 int ret;
1735 struct strbuf tmpfile = STRBUF_INIT;
1736 FILE *result;
1737
1738 strbuf_addf(&tmpfile, "%s.temp", filename);
1739 result = fopen(tmpfile.buf, "a");
1740 if (!result) {
1741 error("Unable to open local file %s", tmpfile.buf);
1742 ret = HTTP_ERROR;
1743 goto cleanup;
1744 }
1745
1746 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1747 fclose(result);
1748
1749 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1750 ret = HTTP_ERROR;
1751 cleanup:
1752 strbuf_release(&tmpfile);
1753 return ret;
1754 }
1755
1756 int http_fetch_ref(const char *base, struct ref *ref)
1757 {
1758 struct http_get_options options = {0};
1759 char *url;
1760 struct strbuf buffer = STRBUF_INIT;
1761 int ret = -1;
1762
1763 options.no_cache = 1;
1764
1765 url = quote_ref_url(base, ref->name);
1766 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1767 strbuf_rtrim(&buffer);
1768 if (buffer.len == 40)
1769 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1770 else if (starts_with(buffer.buf, "ref: ")) {
1771 ref->symref = xstrdup(buffer.buf + 5);
1772 ret = 0;
1773 }
1774 }
1775
1776 strbuf_release(&buffer);
1777 free(url);
1778 return ret;
1779 }
1780
1781 /* Helpers for fetching packs */
1782 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1783 {
1784 char *url, *tmp;
1785 struct strbuf buf = STRBUF_INIT;
1786
1787 if (http_is_verbose)
1788 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1789
1790 end_url_with_slash(&buf, base_url);
1791 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1792 url = strbuf_detach(&buf, NULL);
1793
1794 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1795 tmp = strbuf_detach(&buf, NULL);
1796
1797 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1798 error("Unable to get pack index %s", url);
1799 free(tmp);
1800 tmp = NULL;
1801 }
1802
1803 free(url);
1804 return tmp;
1805 }
1806
1807 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1808 unsigned char *sha1, const char *base_url)
1809 {
1810 struct packed_git *new_pack;
1811 char *tmp_idx = NULL;
1812 int ret;
1813
1814 if (has_pack_index(sha1)) {
1815 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1816 if (!new_pack)
1817 return -1; /* parse_pack_index() already issued error message */
1818 goto add_pack;
1819 }
1820
1821 tmp_idx = fetch_pack_index(sha1, base_url);
1822 if (!tmp_idx)
1823 return -1;
1824
1825 new_pack = parse_pack_index(sha1, tmp_idx);
1826 if (!new_pack) {
1827 unlink(tmp_idx);
1828 free(tmp_idx);
1829
1830 return -1; /* parse_pack_index() already issued error message */
1831 }
1832
1833 ret = verify_pack_index(new_pack);
1834 if (!ret) {
1835 close_pack_index(new_pack);
1836 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1837 }
1838 free(tmp_idx);
1839 if (ret)
1840 return -1;
1841
1842 add_pack:
1843 new_pack->next = *packs_head;
1844 *packs_head = new_pack;
1845 return 0;
1846 }
1847
1848 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1849 {
1850 struct http_get_options options = {0};
1851 int ret = 0, i = 0;
1852 char *url, *data;
1853 struct strbuf buf = STRBUF_INIT;
1854 unsigned char sha1[20];
1855
1856 end_url_with_slash(&buf, base_url);
1857 strbuf_addstr(&buf, "objects/info/packs");
1858 url = strbuf_detach(&buf, NULL);
1859
1860 options.no_cache = 1;
1861 ret = http_get_strbuf(url, &buf, &options);
1862 if (ret != HTTP_OK)
1863 goto cleanup;
1864
1865 data = buf.buf;
1866 while (i < buf.len) {
1867 switch (data[i]) {
1868 case 'P':
1869 i++;
1870 if (i + 52 <= buf.len &&
1871 starts_with(data + i, " pack-") &&
1872 starts_with(data + i + 46, ".pack\n")) {
1873 get_sha1_hex(data + i + 6, sha1);
1874 fetch_and_setup_pack_index(packs_head, sha1,
1875 base_url);
1876 i += 51;
1877 break;
1878 }
1879 default:
1880 while (i < buf.len && data[i] != '\n')
1881 i++;
1882 }
1883 i++;
1884 }
1885
1886 cleanup:
1887 free(url);
1888 return ret;
1889 }
1890
1891 void release_http_pack_request(struct http_pack_request *preq)
1892 {
1893 if (preq->packfile != NULL) {
1894 fclose(preq->packfile);
1895 preq->packfile = NULL;
1896 }
1897 preq->slot = NULL;
1898 free(preq->url);
1899 free(preq);
1900 }
1901
1902 int finish_http_pack_request(struct http_pack_request *preq)
1903 {
1904 struct packed_git **lst;
1905 struct packed_git *p = preq->target;
1906 char *tmp_idx;
1907 size_t len;
1908 struct child_process ip = CHILD_PROCESS_INIT;
1909 const char *ip_argv[8];
1910
1911 close_pack_index(p);
1912
1913 fclose(preq->packfile);
1914 preq->packfile = NULL;
1915
1916 lst = preq->lst;
1917 while (*lst != p)
1918 lst = &((*lst)->next);
1919 *lst = (*lst)->next;
1920
1921 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1922 die("BUG: pack tmpfile does not end in .pack.temp?");
1923 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1924
1925 ip_argv[0] = "index-pack";
1926 ip_argv[1] = "-o";
1927 ip_argv[2] = tmp_idx;
1928 ip_argv[3] = preq->tmpfile;
1929 ip_argv[4] = NULL;
1930
1931 ip.argv = ip_argv;
1932 ip.git_cmd = 1;
1933 ip.no_stdin = 1;
1934 ip.no_stdout = 1;
1935
1936 if (run_command(&ip)) {
1937 unlink(preq->tmpfile);
1938 unlink(tmp_idx);
1939 free(tmp_idx);
1940 return -1;
1941 }
1942
1943 unlink(sha1_pack_index_name(p->sha1));
1944
1945 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1946 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1947 free(tmp_idx);
1948 return -1;
1949 }
1950
1951 install_packed_git(p);
1952 free(tmp_idx);
1953 return 0;
1954 }
1955
1956 struct http_pack_request *new_http_pack_request(
1957 struct packed_git *target, const char *base_url)
1958 {
1959 off_t prev_posn = 0;
1960 struct strbuf buf = STRBUF_INIT;
1961 struct http_pack_request *preq;
1962
1963 preq = xcalloc(1, sizeof(*preq));
1964 preq->target = target;
1965
1966 end_url_with_slash(&buf, base_url);
1967 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1968 sha1_to_hex(target->sha1));
1969 preq->url = strbuf_detach(&buf, NULL);
1970
1971 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1972 sha1_pack_name(target->sha1));
1973 preq->packfile = fopen(preq->tmpfile, "a");
1974 if (!preq->packfile) {
1975 error("Unable to open local file %s for pack",
1976 preq->tmpfile);
1977 goto abort;
1978 }
1979
1980 preq->slot = get_active_slot();
1981 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1982 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1983 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1984 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1985 no_pragma_header);
1986
1987 /*
1988 * If there is data present from a previous transfer attempt,
1989 * resume where it left off
1990 */
1991 prev_posn = ftello(preq->packfile);
1992 if (prev_posn>0) {
1993 if (http_is_verbose)
1994 fprintf(stderr,
1995 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
1996 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
1997 http_opt_request_remainder(preq->slot->curl, prev_posn);
1998 }
1999
2000 return preq;
2001
2002 abort:
2003 free(preq->url);
2004 free(preq);
2005 return NULL;
2006 }
2007
2008 /* Helpers for fetching objects (loose) */
2009 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2010 void *data)
2011 {
2012 unsigned char expn[4096];
2013 size_t size = eltsize * nmemb;
2014 int posn = 0;
2015 struct http_object_request *freq = data;
2016 struct active_request_slot *slot = freq->slot;
2017
2018 if (slot) {
2019 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2020 &slot->http_code);
2021 if (c != CURLE_OK)
2022 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2023 curl_easy_strerror(c));
2024 if (slot->http_code >= 400)
2025 return size;
2026 }
2027
2028 do {
2029 ssize_t retval = xwrite(freq->localfile,
2030 (char *) ptr + posn, size - posn);
2031 if (retval < 0)
2032 return posn;
2033 posn += retval;
2034 } while (posn < size);
2035
2036 freq->stream.avail_in = size;
2037 freq->stream.next_in = (void *)ptr;
2038 do {
2039 freq->stream.next_out = expn;
2040 freq->stream.avail_out = sizeof(expn);
2041 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2042 git_SHA1_Update(&freq->c, expn,
2043 sizeof(expn) - freq->stream.avail_out);
2044 } while (freq->stream.avail_in && freq->zret == Z_OK);
2045 return size;
2046 }
2047
2048 struct http_object_request *new_http_object_request(const char *base_url,
2049 unsigned char *sha1)
2050 {
2051 char *hex = sha1_to_hex(sha1);
2052 const char *filename;
2053 char prevfile[PATH_MAX];
2054 int prevlocal;
2055 char prev_buf[PREV_BUF_SIZE];
2056 ssize_t prev_read = 0;
2057 off_t prev_posn = 0;
2058 struct http_object_request *freq;
2059
2060 freq = xcalloc(1, sizeof(*freq));
2061 hashcpy(freq->sha1, sha1);
2062 freq->localfile = -1;
2063
2064 filename = sha1_file_name(sha1);
2065 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2066 "%s.temp", filename);
2067
2068 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2069 unlink_or_warn(prevfile);
2070 rename(freq->tmpfile, prevfile);
2071 unlink_or_warn(freq->tmpfile);
2072
2073 if (freq->localfile != -1)
2074 error("fd leakage in start: %d", freq->localfile);
2075 freq->localfile = open(freq->tmpfile,
2076 O_WRONLY | O_CREAT | O_EXCL, 0666);
2077 /*
2078 * This could have failed due to the "lazy directory creation";
2079 * try to mkdir the last path component.
2080 */
2081 if (freq->localfile < 0 && errno == ENOENT) {
2082 char *dir = strrchr(freq->tmpfile, '/');
2083 if (dir) {
2084 *dir = 0;
2085 mkdir(freq->tmpfile, 0777);
2086 *dir = '/';
2087 }
2088 freq->localfile = open(freq->tmpfile,
2089 O_WRONLY | O_CREAT | O_EXCL, 0666);
2090 }
2091
2092 if (freq->localfile < 0) {
2093 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2094 goto abort;
2095 }
2096
2097 git_inflate_init(&freq->stream);
2098
2099 git_SHA1_Init(&freq->c);
2100
2101 freq->url = get_remote_object_url(base_url, hex, 0);
2102
2103 /*
2104 * If a previous temp file is present, process what was already
2105 * fetched.
2106 */
2107 prevlocal = open(prevfile, O_RDONLY);
2108 if (prevlocal != -1) {
2109 do {
2110 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2111 if (prev_read>0) {
2112 if (fwrite_sha1_file(prev_buf,
2113 1,
2114 prev_read,
2115 freq) == prev_read) {
2116 prev_posn += prev_read;
2117 } else {
2118 prev_read = -1;
2119 }
2120 }
2121 } while (prev_read > 0);
2122 close(prevlocal);
2123 }
2124 unlink_or_warn(prevfile);
2125
2126 /*
2127 * Reset inflate/SHA1 if there was an error reading the previous temp
2128 * file; also rewind to the beginning of the local file.
2129 */
2130 if (prev_read == -1) {
2131 memset(&freq->stream, 0, sizeof(freq->stream));
2132 git_inflate_init(&freq->stream);
2133 git_SHA1_Init(&freq->c);
2134 if (prev_posn>0) {
2135 prev_posn = 0;
2136 lseek(freq->localfile, 0, SEEK_SET);
2137 if (ftruncate(freq->localfile, 0) < 0) {
2138 error_errno("Couldn't truncate temporary file %s",
2139 freq->tmpfile);
2140 goto abort;
2141 }
2142 }
2143 }
2144
2145 freq->slot = get_active_slot();
2146
2147 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2148 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2149 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2150 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2151 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2152 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2153
2154 /*
2155 * If we have successfully processed data from a previous fetch
2156 * attempt, only fetch the data we don't already have.
2157 */
2158 if (prev_posn>0) {
2159 if (http_is_verbose)
2160 fprintf(stderr,
2161 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2162 hex, (uintmax_t)prev_posn);
2163 http_opt_request_remainder(freq->slot->curl, prev_posn);
2164 }
2165
2166 return freq;
2167
2168 abort:
2169 free(freq->url);
2170 free(freq);
2171 return NULL;
2172 }
2173
2174 void process_http_object_request(struct http_object_request *freq)
2175 {
2176 if (freq->slot == NULL)
2177 return;
2178 freq->curl_result = freq->slot->curl_result;
2179 freq->http_code = freq->slot->http_code;
2180 freq->slot = NULL;
2181 }
2182
2183 int finish_http_object_request(struct http_object_request *freq)
2184 {
2185 struct stat st;
2186
2187 close(freq->localfile);
2188 freq->localfile = -1;
2189
2190 process_http_object_request(freq);
2191
2192 if (freq->http_code == 416) {
2193 warning("requested range invalid; we may already have all the data.");
2194 } else if (freq->curl_result != CURLE_OK) {
2195 if (stat(freq->tmpfile, &st) == 0)
2196 if (st.st_size == 0)
2197 unlink_or_warn(freq->tmpfile);
2198 return -1;
2199 }
2200
2201 git_inflate_end(&freq->stream);
2202 git_SHA1_Final(freq->real_sha1, &freq->c);
2203 if (freq->zret != Z_STREAM_END) {
2204 unlink_or_warn(freq->tmpfile);
2205 return -1;
2206 }
2207 if (hashcmp(freq->sha1, freq->real_sha1)) {
2208 unlink_or_warn(freq->tmpfile);
2209 return -1;
2210 }
2211 freq->rename =
2212 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2213
2214 return freq->rename;
2215 }
2216
2217 void abort_http_object_request(struct http_object_request *freq)
2218 {
2219 unlink_or_warn(freq->tmpfile);
2220
2221 release_http_object_request(freq);
2222 }
2223
2224 void release_http_object_request(struct http_object_request *freq)
2225 {
2226 if (freq->localfile != -1) {
2227 close(freq->localfile);
2228 freq->localfile = -1;
2229 }
2230 if (freq->url != NULL) {
2231 free(freq->url);
2232 freq->url = NULL;
2233 }
2234 if (freq->slot != NULL) {
2235 freq->slot->callback_func = NULL;
2236 freq->slot->callback_data = NULL;
2237 release_active_slot(freq->slot);
2238 freq->slot = NULL;
2239 }
2240 }
git for Debian