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difftool: handle modified symlinks in dir-diff mode
[git/debian.git] / http.c
blob4c4a812fcc39509e32fbcae3db21871b97a1a5eb
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 static void xmulti_remove_handle(struct active_request_slot *slot)
217 {
218 #ifdef USE_CURL_MULTI
219 curl_multi_remove_handle(curlm, slot->curl);
220 #endif
221 }
222
223 #ifdef USE_CURL_MULTI
224 static void process_curl_messages(void)
225 {
226 int num_messages;
227 struct active_request_slot *slot;
228 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
229
230 while (curl_message != NULL) {
231 if (curl_message->msg == CURLMSG_DONE) {
232 int curl_result = curl_message->data.result;
233 slot = active_queue_head;
234 while (slot != NULL &&
235 slot->curl != curl_message->easy_handle)
236 slot = slot->next;
237 if (slot != NULL) {
238 xmulti_remove_handle(slot);
239 slot->curl_result = curl_result;
240 finish_active_slot(slot);
241 } else {
242 fprintf(stderr, "Received DONE message for unknown request!\n");
243 }
244 } else {
245 fprintf(stderr, "Unknown CURL message received: %d\n",
246 (int)curl_message->msg);
247 }
248 curl_message = curl_multi_info_read(curlm, &num_messages);
249 }
250 }
251 #endif
252
253 static int http_options(const char *var, const char *value, void *cb)
254 {
255 if (!strcmp("http.sslverify", var)) {
256 curl_ssl_verify = git_config_bool(var, value);
257 return 0;
258 }
259 if (!strcmp("http.sslcipherlist", var))
260 return git_config_string(&ssl_cipherlist, var, value);
261 if (!strcmp("http.sslversion", var))
262 return git_config_string(&ssl_version, var, value);
263 if (!strcmp("http.sslcert", var))
264 return git_config_string(&ssl_cert, var, value);
265 #if LIBCURL_VERSION_NUM >= 0x070903
266 if (!strcmp("http.sslkey", var))
267 return git_config_string(&ssl_key, var, value);
268 #endif
269 #if LIBCURL_VERSION_NUM >= 0x070908
270 if (!strcmp("http.sslcapath", var))
271 return git_config_pathname(&ssl_capath, var, value);
272 #endif
273 if (!strcmp("http.sslcainfo", var))
274 return git_config_pathname(&ssl_cainfo, var, value);
275 if (!strcmp("http.sslcertpasswordprotected", var)) {
276 ssl_cert_password_required = git_config_bool(var, value);
277 return 0;
278 }
279 if (!strcmp("http.ssltry", var)) {
280 curl_ssl_try = git_config_bool(var, value);
281 return 0;
282 }
283 if (!strcmp("http.minsessions", var)) {
284 min_curl_sessions = git_config_int(var, value);
285 #ifndef USE_CURL_MULTI
286 if (min_curl_sessions > 1)
287 min_curl_sessions = 1;
288 #endif
289 return 0;
290 }
291 #ifdef USE_CURL_MULTI
292 if (!strcmp("http.maxrequests", var)) {
293 max_requests = git_config_int(var, value);
294 return 0;
295 }
296 #endif
297 if (!strcmp("http.lowspeedlimit", var)) {
298 curl_low_speed_limit = (long)git_config_int(var, value);
299 return 0;
300 }
301 if (!strcmp("http.lowspeedtime", var)) {
302 curl_low_speed_time = (long)git_config_int(var, value);
303 return 0;
304 }
305
306 if (!strcmp("http.noepsv", var)) {
307 curl_ftp_no_epsv = git_config_bool(var, value);
308 return 0;
309 }
310 if (!strcmp("http.proxy", var))
311 return git_config_string(&curl_http_proxy, var, value);
312
313 if (!strcmp("http.proxyauthmethod", var))
314 return git_config_string(&http_proxy_authmethod, var, value);
315
316 if (!strcmp("http.cookiefile", var))
317 return git_config_pathname(&curl_cookie_file, var, value);
318 if (!strcmp("http.savecookies", var)) {
319 curl_save_cookies = git_config_bool(var, value);
320 return 0;
321 }
322
323 if (!strcmp("http.postbuffer", var)) {
324 http_post_buffer = git_config_int(var, value);
325 if (http_post_buffer < LARGE_PACKET_MAX)
326 http_post_buffer = LARGE_PACKET_MAX;
327 return 0;
328 }
329
330 if (!strcmp("http.useragent", var))
331 return git_config_string(&user_agent, var, value);
332
333 if (!strcmp("http.emptyauth", var)) {
334 curl_empty_auth = git_config_bool(var, value);
335 return 0;
336 }
337
338 if (!strcmp("http.delegation", var)) {
339 #if LIBCURL_VERSION_NUM >= 0x071600
340 return git_config_string(&curl_deleg, var, value);
341 #else
342 warning(_("Delegation control is not supported with cURL < 7.22.0"));
343 return 0;
344 #endif
345 }
346
347 if (!strcmp("http.pinnedpubkey", var)) {
348 #if LIBCURL_VERSION_NUM >= 0x072c00
349 return git_config_pathname(&ssl_pinnedkey, var, value);
350 #else
351 warning(_("Public key pinning not supported with cURL < 7.44.0"));
352 return 0;
353 #endif
354 }
355
356 if (!strcmp("http.extraheader", var)) {
357 if (!value) {
358 return config_error_nonbool(var);
359 } else if (!*value) {
360 curl_slist_free_all(extra_http_headers);
361 extra_http_headers = NULL;
362 } else {
363 extra_http_headers =
364 curl_slist_append(extra_http_headers, value);
365 }
366 return 0;
367 }
368
369 /* Fall back on the default ones */
370 return git_default_config(var, value, cb);
371 }
372
373 static void init_curl_http_auth(CURL *result)
374 {
375 if (!http_auth.username || !*http_auth.username) {
376 if (curl_empty_auth)
377 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
378 return;
379 }
380
381 credential_fill(&http_auth);
382
383 #if LIBCURL_VERSION_NUM >= 0x071301
384 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
385 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
386 #else
387 {
388 static struct strbuf up = STRBUF_INIT;
389 /*
390 * Note that we assume we only ever have a single set of
391 * credentials in a given program run, so we do not have
392 * to worry about updating this buffer, only setting its
393 * initial value.
394 */
395 if (!up.len)
396 strbuf_addf(&up, "%s:%s",
397 http_auth.username, http_auth.password);
398 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
399 }
400 #endif
401 }
402
403 /* *var must be free-able */
404 static void var_override(const char **var, char *value)
405 {
406 if (value) {
407 free((void *)*var);
408 *var = xstrdup(value);
409 }
410 }
411
412 static void set_proxyauth_name_password(CURL *result)
413 {
414 #if LIBCURL_VERSION_NUM >= 0x071301
415 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
416 proxy_auth.username);
417 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
418 proxy_auth.password);
419 #else
420 struct strbuf s = STRBUF_INIT;
421
422 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
423 strbuf_addch(&s, ':');
424 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
425 curl_proxyuserpwd = strbuf_detach(&s, NULL);
426 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
427 #endif
428 }
429
430 static void init_curl_proxy_auth(CURL *result)
431 {
432 if (proxy_auth.username) {
433 if (!proxy_auth.password)
434 credential_fill(&proxy_auth);
435 set_proxyauth_name_password(result);
436 }
437
438 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
439
440 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
441 if (http_proxy_authmethod) {
442 int i;
443 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
444 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
445 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
446 proxy_authmethods[i].curlauth_param);
447 break;
448 }
449 }
450 if (i == ARRAY_SIZE(proxy_authmethods)) {
451 warning("unsupported proxy authentication method %s: using anyauth",
452 http_proxy_authmethod);
453 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
454 }
455 }
456 else
457 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
458 #endif
459 }
460
461 static int has_cert_password(void)
462 {
463 if (ssl_cert == NULL || ssl_cert_password_required != 1)
464 return 0;
465 if (!cert_auth.password) {
466 cert_auth.protocol = xstrdup("cert");
467 cert_auth.username = xstrdup("");
468 cert_auth.path = xstrdup(ssl_cert);
469 credential_fill(&cert_auth);
470 }
471 return 1;
472 }
473
474 #if LIBCURL_VERSION_NUM >= 0x071900
475 static void set_curl_keepalive(CURL *c)
476 {
477 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
478 }
479
480 #elif LIBCURL_VERSION_NUM >= 0x071000
481 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
482 {
483 int ka = 1;
484 int rc;
485 socklen_t len = (socklen_t)sizeof(ka);
486
487 if (type != CURLSOCKTYPE_IPCXN)
488 return 0;
489
490 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
491 if (rc < 0)
492 warning_errno("unable to set SO_KEEPALIVE on socket");
493
494 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
495 }
496
497 static void set_curl_keepalive(CURL *c)
498 {
499 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
500 }
501
502 #else
503 static void set_curl_keepalive(CURL *c)
504 {
505 /* not supported on older curl versions */
506 }
507 #endif
508
509 static void redact_sensitive_header(struct strbuf *header)
510 {
511 const char *sensitive_header;
512
513 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
514 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
515 /* The first token is the type, which is OK to log */
516 while (isspace(*sensitive_header))
517 sensitive_header++;
518 while (*sensitive_header && !isspace(*sensitive_header))
519 sensitive_header++;
520 /* Everything else is opaque and possibly sensitive */
521 strbuf_setlen(header, sensitive_header - header->buf);
522 strbuf_addstr(header, " <redacted>");
523 }
524 }
525
526 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
527 {
528 struct strbuf out = STRBUF_INIT;
529 struct strbuf **headers, **header;
530
531 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
532 text, (long)size, (long)size);
533 trace_strbuf(&trace_curl, &out);
534 strbuf_reset(&out);
535 strbuf_add(&out, ptr, size);
536 headers = strbuf_split_max(&out, '\n', 0);
537
538 for (header = headers; *header; header++) {
539 if (hide_sensitive_header)
540 redact_sensitive_header(*header);
541 strbuf_insert((*header), 0, text, strlen(text));
542 strbuf_insert((*header), strlen(text), ": ", 2);
543 strbuf_rtrim((*header));
544 strbuf_addch((*header), '\n');
545 trace_strbuf(&trace_curl, (*header));
546 }
547 strbuf_list_free(headers);
548 strbuf_release(&out);
549 }
550
551 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
552 {
553 size_t i;
554 struct strbuf out = STRBUF_INIT;
555 unsigned int width = 60;
556
557 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
558 text, (long)size, (long)size);
559 trace_strbuf(&trace_curl, &out);
560
561 for (i = 0; i < size; i += width) {
562 size_t w;
563
564 strbuf_reset(&out);
565 strbuf_addf(&out, "%s: ", text);
566 for (w = 0; (w < width) && (i + w < size); w++) {
567 unsigned char ch = ptr[i + w];
568
569 strbuf_addch(&out,
570 (ch >= 0x20) && (ch < 0x80)
571 ? ch : '.');
572 }
573 strbuf_addch(&out, '\n');
574 trace_strbuf(&trace_curl, &out);
575 }
576 strbuf_release(&out);
577 }
578
579 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
580 {
581 const char *text;
582 enum { NO_FILTER = 0, DO_FILTER = 1 };
583
584 switch (type) {
585 case CURLINFO_TEXT:
586 trace_printf_key(&trace_curl, "== Info: %s", data);
587 default: /* we ignore unknown types by default */
588 return 0;
589
590 case CURLINFO_HEADER_OUT:
591 text = "=> Send header";
592 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
593 break;
594 case CURLINFO_DATA_OUT:
595 text = "=> Send data";
596 curl_dump_data(text, (unsigned char *)data, size);
597 break;
598 case CURLINFO_SSL_DATA_OUT:
599 text = "=> Send SSL data";
600 curl_dump_data(text, (unsigned char *)data, size);
601 break;
602 case CURLINFO_HEADER_IN:
603 text = "<= Recv header";
604 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
605 break;
606 case CURLINFO_DATA_IN:
607 text = "<= Recv data";
608 curl_dump_data(text, (unsigned char *)data, size);
609 break;
610 case CURLINFO_SSL_DATA_IN:
611 text = "<= Recv SSL data";
612 curl_dump_data(text, (unsigned char *)data, size);
613 break;
614 }
615 return 0;
616 }
617
618 void setup_curl_trace(CURL *handle)
619 {
620 if (!trace_want(&trace_curl))
621 return;
622 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
623 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
624 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
625 }
626
627
628 static CURL *get_curl_handle(void)
629 {
630 CURL *result = curl_easy_init();
631 long allowed_protocols = 0;
632
633 if (!result)
634 die("curl_easy_init failed");
635
636 if (!curl_ssl_verify) {
637 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
638 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
639 } else {
640 /* Verify authenticity of the peer's certificate */
641 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
642 /* The name in the cert must match whom we tried to connect */
643 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
644 }
645
646 #if LIBCURL_VERSION_NUM >= 0x070907
647 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
648 #endif
649 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
650 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
651 #endif
652
653 #if LIBCURL_VERSION_NUM >= 0x071600
654 if (curl_deleg) {
655 int i;
656 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
657 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
658 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
659 curl_deleg_levels[i].curl_deleg_param);
660 break;
661 }
662 }
663 if (i == ARRAY_SIZE(curl_deleg_levels))
664 warning("Unknown delegation method '%s': using default",
665 curl_deleg);
666 }
667 #endif
668
669 if (http_proactive_auth)
670 init_curl_http_auth(result);
671
672 if (getenv("GIT_SSL_VERSION"))
673 ssl_version = getenv("GIT_SSL_VERSION");
674 if (ssl_version && *ssl_version) {
675 int i;
676 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
677 if (!strcmp(ssl_version, sslversions[i].name)) {
678 curl_easy_setopt(result, CURLOPT_SSLVERSION,
679 sslversions[i].ssl_version);
680 break;
681 }
682 }
683 if (i == ARRAY_SIZE(sslversions))
684 warning("unsupported ssl version %s: using default",
685 ssl_version);
686 }
687
688 if (getenv("GIT_SSL_CIPHER_LIST"))
689 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
690 if (ssl_cipherlist != NULL && *ssl_cipherlist)
691 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
692 ssl_cipherlist);
693
694 if (ssl_cert != NULL)
695 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
696 if (has_cert_password())
697 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
698 #if LIBCURL_VERSION_NUM >= 0x070903
699 if (ssl_key != NULL)
700 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
701 #endif
702 #if LIBCURL_VERSION_NUM >= 0x070908
703 if (ssl_capath != NULL)
704 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
705 #endif
706 #if LIBCURL_VERSION_NUM >= 0x072c00
707 if (ssl_pinnedkey != NULL)
708 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
709 #endif
710 if (ssl_cainfo != NULL)
711 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
712
713 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
714 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
715 curl_low_speed_limit);
716 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
717 curl_low_speed_time);
718 }
719
720 curl_easy_setopt(result, CURLOPT_FOLLOWLOCATION, 1);
721 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
722 #if LIBCURL_VERSION_NUM >= 0x071301
723 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
724 #elif LIBCURL_VERSION_NUM >= 0x071101
725 curl_easy_setopt(result, CURLOPT_POST301, 1);
726 #endif
727 #if LIBCURL_VERSION_NUM >= 0x071304
728 if (is_transport_allowed("http"))
729 allowed_protocols |= CURLPROTO_HTTP;
730 if (is_transport_allowed("https"))
731 allowed_protocols |= CURLPROTO_HTTPS;
732 if (is_transport_allowed("ftp"))
733 allowed_protocols |= CURLPROTO_FTP;
734 if (is_transport_allowed("ftps"))
735 allowed_protocols |= CURLPROTO_FTPS;
736 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS, allowed_protocols);
737 #else
738 if (transport_restrict_protocols())
739 warning("protocol restrictions not applied to curl redirects because\n"
740 "your curl version is too old (>= 7.19.4)");
741 #endif
742 if (getenv("GIT_CURL_VERBOSE"))
743 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
744 setup_curl_trace(result);
745
746 curl_easy_setopt(result, CURLOPT_USERAGENT,
747 user_agent ? user_agent : git_user_agent());
748
749 if (curl_ftp_no_epsv)
750 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
751
752 #ifdef CURLOPT_USE_SSL
753 if (curl_ssl_try)
754 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
755 #endif
756
757 /*
758 * CURL also examines these variables as a fallback; but we need to query
759 * them here in order to decide whether to prompt for missing password (cf.
760 * init_curl_proxy_auth()).
761 *
762 * Unlike many other common environment variables, these are historically
763 * lowercase only. It appears that CURL did not know this and implemented
764 * only uppercase variants, which was later corrected to take both - with
765 * the exception of http_proxy, which is lowercase only also in CURL. As
766 * the lowercase versions are the historical quasi-standard, they take
767 * precedence here, as in CURL.
768 */
769 if (!curl_http_proxy) {
770 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
771 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
772 var_override(&curl_http_proxy, getenv("https_proxy"));
773 } else {
774 var_override(&curl_http_proxy, getenv("http_proxy"));
775 }
776 if (!curl_http_proxy) {
777 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
778 var_override(&curl_http_proxy, getenv("all_proxy"));
779 }
780 }
781
782 if (curl_http_proxy) {
783 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
784 #if LIBCURL_VERSION_NUM >= 0x071800
785 if (starts_with(curl_http_proxy, "socks5h"))
786 curl_easy_setopt(result,
787 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
788 else if (starts_with(curl_http_proxy, "socks5"))
789 curl_easy_setopt(result,
790 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
791 else if (starts_with(curl_http_proxy, "socks4a"))
792 curl_easy_setopt(result,
793 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
794 else if (starts_with(curl_http_proxy, "socks"))
795 curl_easy_setopt(result,
796 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
797 #endif
798 if (strstr(curl_http_proxy, "://"))
799 credential_from_url(&proxy_auth, curl_http_proxy);
800 else {
801 struct strbuf url = STRBUF_INIT;
802 strbuf_addf(&url, "http://%s", curl_http_proxy);
803 credential_from_url(&proxy_auth, url.buf);
804 strbuf_release(&url);
805 }
806
807 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
808 #if LIBCURL_VERSION_NUM >= 0x071304
809 var_override(&curl_no_proxy, getenv("NO_PROXY"));
810 var_override(&curl_no_proxy, getenv("no_proxy"));
811 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
812 #endif
813 }
814 init_curl_proxy_auth(result);
815
816 set_curl_keepalive(result);
817
818 return result;
819 }
820
821 static void set_from_env(const char **var, const char *envname)
822 {
823 const char *val = getenv(envname);
824 if (val)
825 *var = val;
826 }
827
828 void http_init(struct remote *remote, const char *url, int proactive_auth)
829 {
830 char *low_speed_limit;
831 char *low_speed_time;
832 char *normalized_url;
833 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
834
835 config.section = "http";
836 config.key = NULL;
837 config.collect_fn = http_options;
838 config.cascade_fn = git_default_config;
839 config.cb = NULL;
840
841 http_is_verbose = 0;
842 normalized_url = url_normalize(url, &config.url);
843
844 git_config(urlmatch_config_entry, &config);
845 free(normalized_url);
846
847 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
848 die("curl_global_init failed");
849
850 http_proactive_auth = proactive_auth;
851
852 if (remote && remote->http_proxy)
853 curl_http_proxy = xstrdup(remote->http_proxy);
854
855 if (remote)
856 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
857
858 pragma_header = curl_slist_append(http_copy_default_headers(),
859 "Pragma: no-cache");
860 no_pragma_header = curl_slist_append(http_copy_default_headers(),
861 "Pragma:");
862
863 #ifdef USE_CURL_MULTI
864 {
865 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
866 if (http_max_requests != NULL)
867 max_requests = atoi(http_max_requests);
868 }
869
870 curlm = curl_multi_init();
871 if (!curlm)
872 die("curl_multi_init failed");
873 #endif
874
875 if (getenv("GIT_SSL_NO_VERIFY"))
876 curl_ssl_verify = 0;
877
878 set_from_env(&ssl_cert, "GIT_SSL_CERT");
879 #if LIBCURL_VERSION_NUM >= 0x070903
880 set_from_env(&ssl_key, "GIT_SSL_KEY");
881 #endif
882 #if LIBCURL_VERSION_NUM >= 0x070908
883 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
884 #endif
885 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
886
887 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
888
889 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
890 if (low_speed_limit != NULL)
891 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
892 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
893 if (low_speed_time != NULL)
894 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
895
896 if (curl_ssl_verify == -1)
897 curl_ssl_verify = 1;
898
899 curl_session_count = 0;
900 #ifdef USE_CURL_MULTI
901 if (max_requests < 1)
902 max_requests = DEFAULT_MAX_REQUESTS;
903 #endif
904
905 if (getenv("GIT_CURL_FTP_NO_EPSV"))
906 curl_ftp_no_epsv = 1;
907
908 if (url) {
909 credential_from_url(&http_auth, url);
910 if (!ssl_cert_password_required &&
911 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
912 starts_with(url, "https://"))
913 ssl_cert_password_required = 1;
914 }
915
916 #ifndef NO_CURL_EASY_DUPHANDLE
917 curl_default = get_curl_handle();
918 #endif
919 }
920
921 void http_cleanup(void)
922 {
923 struct active_request_slot *slot = active_queue_head;
924
925 while (slot != NULL) {
926 struct active_request_slot *next = slot->next;
927 if (slot->curl != NULL) {
928 xmulti_remove_handle(slot);
929 curl_easy_cleanup(slot->curl);
930 }
931 free(slot);
932 slot = next;
933 }
934 active_queue_head = NULL;
935
936 #ifndef NO_CURL_EASY_DUPHANDLE
937 curl_easy_cleanup(curl_default);
938 #endif
939
940 #ifdef USE_CURL_MULTI
941 curl_multi_cleanup(curlm);
942 #endif
943 curl_global_cleanup();
944
945 curl_slist_free_all(extra_http_headers);
946 extra_http_headers = NULL;
947
948 curl_slist_free_all(pragma_header);
949 pragma_header = NULL;
950
951 curl_slist_free_all(no_pragma_header);
952 no_pragma_header = NULL;
953
954 if (curl_http_proxy) {
955 free((void *)curl_http_proxy);
956 curl_http_proxy = NULL;
957 }
958
959 if (proxy_auth.password) {
960 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
961 free(proxy_auth.password);
962 proxy_auth.password = NULL;
963 }
964
965 free((void *)curl_proxyuserpwd);
966 curl_proxyuserpwd = NULL;
967
968 free((void *)http_proxy_authmethod);
969 http_proxy_authmethod = NULL;
970
971 if (cert_auth.password != NULL) {
972 memset(cert_auth.password, 0, strlen(cert_auth.password));
973 free(cert_auth.password);
974 cert_auth.password = NULL;
975 }
976 ssl_cert_password_required = 0;
977
978 free(cached_accept_language);
979 cached_accept_language = NULL;
980 }
981
982 struct active_request_slot *get_active_slot(void)
983 {
984 struct active_request_slot *slot = active_queue_head;
985 struct active_request_slot *newslot;
986
987 #ifdef USE_CURL_MULTI
988 int num_transfers;
989
990 /* Wait for a slot to open up if the queue is full */
991 while (active_requests >= max_requests) {
992 curl_multi_perform(curlm, &num_transfers);
993 if (num_transfers < active_requests)
994 process_curl_messages();
995 }
996 #endif
997
998 while (slot != NULL && slot->in_use)
999 slot = slot->next;
1000
1001 if (slot == NULL) {
1002 newslot = xmalloc(sizeof(*newslot));
1003 newslot->curl = NULL;
1004 newslot->in_use = 0;
1005 newslot->next = NULL;
1006
1007 slot = active_queue_head;
1008 if (slot == NULL) {
1009 active_queue_head = newslot;
1010 } else {
1011 while (slot->next != NULL)
1012 slot = slot->next;
1013 slot->next = newslot;
1014 }
1015 slot = newslot;
1016 }
1017
1018 if (slot->curl == NULL) {
1019 #ifdef NO_CURL_EASY_DUPHANDLE
1020 slot->curl = get_curl_handle();
1021 #else
1022 slot->curl = curl_easy_duphandle(curl_default);
1023 #endif
1024 curl_session_count++;
1025 }
1026
1027 active_requests++;
1028 slot->in_use = 1;
1029 slot->results = NULL;
1030 slot->finished = NULL;
1031 slot->callback_data = NULL;
1032 slot->callback_func = NULL;
1033 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1034 if (curl_save_cookies)
1035 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1036 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1037 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1038 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1039 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1040 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1041 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1042 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1043 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1044 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1045 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1046
1047 #if LIBCURL_VERSION_NUM >= 0x070a08
1048 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1049 #endif
1050 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1051 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1052 #endif
1053 if (http_auth.password || curl_empty_auth)
1054 init_curl_http_auth(slot->curl);
1055
1056 return slot;
1057 }
1058
1059 int start_active_slot(struct active_request_slot *slot)
1060 {
1061 #ifdef USE_CURL_MULTI
1062 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1063 int num_transfers;
1064
1065 if (curlm_result != CURLM_OK &&
1066 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1067 warning("curl_multi_add_handle failed: %s",
1068 curl_multi_strerror(curlm_result));
1069 active_requests--;
1070 slot->in_use = 0;
1071 return 0;
1072 }
1073
1074 /*
1075 * We know there must be something to do, since we just added
1076 * something.
1077 */
1078 curl_multi_perform(curlm, &num_transfers);
1079 #endif
1080 return 1;
1081 }
1082
1083 #ifdef USE_CURL_MULTI
1084 struct fill_chain {
1085 void *data;
1086 int (*fill)(void *);
1087 struct fill_chain *next;
1088 };
1089
1090 static struct fill_chain *fill_cfg;
1091
1092 void add_fill_function(void *data, int (*fill)(void *))
1093 {
1094 struct fill_chain *new = xmalloc(sizeof(*new));
1095 struct fill_chain **linkp = &fill_cfg;
1096 new->data = data;
1097 new->fill = fill;
1098 new->next = NULL;
1099 while (*linkp)
1100 linkp = &(*linkp)->next;
1101 *linkp = new;
1102 }
1103
1104 void fill_active_slots(void)
1105 {
1106 struct active_request_slot *slot = active_queue_head;
1107
1108 while (active_requests < max_requests) {
1109 struct fill_chain *fill;
1110 for (fill = fill_cfg; fill; fill = fill->next)
1111 if (fill->fill(fill->data))
1112 break;
1113
1114 if (!fill)
1115 break;
1116 }
1117
1118 while (slot != NULL) {
1119 if (!slot->in_use && slot->curl != NULL
1120 && curl_session_count > min_curl_sessions) {
1121 curl_easy_cleanup(slot->curl);
1122 slot->curl = NULL;
1123 curl_session_count--;
1124 }
1125 slot = slot->next;
1126 }
1127 }
1128
1129 void step_active_slots(void)
1130 {
1131 int num_transfers;
1132 CURLMcode curlm_result;
1133
1134 do {
1135 curlm_result = curl_multi_perform(curlm, &num_transfers);
1136 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1137 if (num_transfers < active_requests) {
1138 process_curl_messages();
1139 fill_active_slots();
1140 }
1141 }
1142 #endif
1143
1144 void run_active_slot(struct active_request_slot *slot)
1145 {
1146 #ifdef USE_CURL_MULTI
1147 fd_set readfds;
1148 fd_set writefds;
1149 fd_set excfds;
1150 int max_fd;
1151 struct timeval select_timeout;
1152 int finished = 0;
1153
1154 slot->finished = &finished;
1155 while (!finished) {
1156 step_active_slots();
1157
1158 if (slot->in_use) {
1159 #if LIBCURL_VERSION_NUM >= 0x070f04
1160 long curl_timeout;
1161 curl_multi_timeout(curlm, &curl_timeout);
1162 if (curl_timeout == 0) {
1163 continue;
1164 } else if (curl_timeout == -1) {
1165 select_timeout.tv_sec = 0;
1166 select_timeout.tv_usec = 50000;
1167 } else {
1168 select_timeout.tv_sec = curl_timeout / 1000;
1169 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1170 }
1171 #else
1172 select_timeout.tv_sec = 0;
1173 select_timeout.tv_usec = 50000;
1174 #endif
1175
1176 max_fd = -1;
1177 FD_ZERO(&readfds);
1178 FD_ZERO(&writefds);
1179 FD_ZERO(&excfds);
1180 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1181
1182 /*
1183 * It can happen that curl_multi_timeout returns a pathologically
1184 * long timeout when curl_multi_fdset returns no file descriptors
1185 * to read. See commit message for more details.
1186 */
1187 if (max_fd < 0 &&
1188 (select_timeout.tv_sec > 0 ||
1189 select_timeout.tv_usec > 50000)) {
1190 select_timeout.tv_sec = 0;
1191 select_timeout.tv_usec = 50000;
1192 }
1193
1194 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1195 }
1196 }
1197 #else
1198 while (slot->in_use) {
1199 slot->curl_result = curl_easy_perform(slot->curl);
1200 finish_active_slot(slot);
1201 }
1202 #endif
1203 }
1204
1205 static void release_active_slot(struct active_request_slot *slot)
1206 {
1207 closedown_active_slot(slot);
1208 if (slot->curl) {
1209 xmulti_remove_handle(slot);
1210 if (curl_session_count > min_curl_sessions) {
1211 curl_easy_cleanup(slot->curl);
1212 slot->curl = NULL;
1213 curl_session_count--;
1214 }
1215 }
1216 #ifdef USE_CURL_MULTI
1217 fill_active_slots();
1218 #endif
1219 }
1220
1221 void finish_all_active_slots(void)
1222 {
1223 struct active_request_slot *slot = active_queue_head;
1224
1225 while (slot != NULL)
1226 if (slot->in_use) {
1227 run_active_slot(slot);
1228 slot = active_queue_head;
1229 } else {
1230 slot = slot->next;
1231 }
1232 }
1233
1234 /* Helpers for modifying and creating URLs */
1235 static inline int needs_quote(int ch)
1236 {
1237 if (((ch >= 'A') && (ch <= 'Z'))
1238 || ((ch >= 'a') && (ch <= 'z'))
1239 || ((ch >= '0') && (ch <= '9'))
1240 || (ch == '/')
1241 || (ch == '-')
1242 || (ch == '.'))
1243 return 0;
1244 return 1;
1245 }
1246
1247 static char *quote_ref_url(const char *base, const char *ref)
1248 {
1249 struct strbuf buf = STRBUF_INIT;
1250 const char *cp;
1251 int ch;
1252
1253 end_url_with_slash(&buf, base);
1254
1255 for (cp = ref; (ch = *cp) != 0; cp++)
1256 if (needs_quote(ch))
1257 strbuf_addf(&buf, "%%%02x", ch);
1258 else
1259 strbuf_addch(&buf, *cp);
1260
1261 return strbuf_detach(&buf, NULL);
1262 }
1263
1264 void append_remote_object_url(struct strbuf *buf, const char *url,
1265 const char *hex,
1266 int only_two_digit_prefix)
1267 {
1268 end_url_with_slash(buf, url);
1269
1270 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1271 if (!only_two_digit_prefix)
1272 strbuf_addstr(buf, hex + 2);
1273 }
1274
1275 char *get_remote_object_url(const char *url, const char *hex,
1276 int only_two_digit_prefix)
1277 {
1278 struct strbuf buf = STRBUF_INIT;
1279 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1280 return strbuf_detach(&buf, NULL);
1281 }
1282
1283 static int handle_curl_result(struct slot_results *results)
1284 {
1285 /*
1286 * If we see a failing http code with CURLE_OK, we have turned off
1287 * FAILONERROR (to keep the server's custom error response), and should
1288 * translate the code into failure here.
1289 */
1290 if (results->curl_result == CURLE_OK &&
1291 results->http_code >= 400) {
1292 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1293 /*
1294 * Normally curl will already have put the "reason phrase"
1295 * from the server into curl_errorstr; unfortunately without
1296 * FAILONERROR it is lost, so we can give only the numeric
1297 * status code.
1298 */
1299 snprintf(curl_errorstr, sizeof(curl_errorstr),
1300 "The requested URL returned error: %ld",
1301 results->http_code);
1302 }
1303
1304 if (results->curl_result == CURLE_OK) {
1305 credential_approve(&http_auth);
1306 if (proxy_auth.password)
1307 credential_approve(&proxy_auth);
1308 return HTTP_OK;
1309 } else if (missing_target(results))
1310 return HTTP_MISSING_TARGET;
1311 else if (results->http_code == 401) {
1312 if (http_auth.username && http_auth.password) {
1313 credential_reject(&http_auth);
1314 return HTTP_NOAUTH;
1315 } else {
1316 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1317 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1318 #endif
1319 return HTTP_REAUTH;
1320 }
1321 } else {
1322 if (results->http_connectcode == 407)
1323 credential_reject(&proxy_auth);
1324 #if LIBCURL_VERSION_NUM >= 0x070c00
1325 if (!curl_errorstr[0])
1326 strlcpy(curl_errorstr,
1327 curl_easy_strerror(results->curl_result),
1328 sizeof(curl_errorstr));
1329 #endif
1330 return HTTP_ERROR;
1331 }
1332 }
1333
1334 int run_one_slot(struct active_request_slot *slot,
1335 struct slot_results *results)
1336 {
1337 slot->results = results;
1338 if (!start_active_slot(slot)) {
1339 snprintf(curl_errorstr, sizeof(curl_errorstr),
1340 "failed to start HTTP request");
1341 return HTTP_START_FAILED;
1342 }
1343
1344 run_active_slot(slot);
1345 return handle_curl_result(results);
1346 }
1347
1348 struct curl_slist *http_copy_default_headers(void)
1349 {
1350 struct curl_slist *headers = NULL, *h;
1351
1352 for (h = extra_http_headers; h; h = h->next)
1353 headers = curl_slist_append(headers, h->data);
1354
1355 return headers;
1356 }
1357
1358 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1359 {
1360 char *ptr;
1361 CURLcode ret;
1362
1363 strbuf_reset(buf);
1364 ret = curl_easy_getinfo(curl, info, &ptr);
1365 if (!ret && ptr)
1366 strbuf_addstr(buf, ptr);
1367 return ret;
1368 }
1369
1370 /*
1371 * Check for and extract a content-type parameter. "raw"
1372 * should be positioned at the start of the potential
1373 * parameter, with any whitespace already removed.
1374 *
1375 * "name" is the name of the parameter. The value is appended
1376 * to "out".
1377 */
1378 static int extract_param(const char *raw, const char *name,
1379 struct strbuf *out)
1380 {
1381 size_t len = strlen(name);
1382
1383 if (strncasecmp(raw, name, len))
1384 return -1;
1385 raw += len;
1386
1387 if (*raw != '=')
1388 return -1;
1389 raw++;
1390
1391 while (*raw && !isspace(*raw) && *raw != ';')
1392 strbuf_addch(out, *raw++);
1393 return 0;
1394 }
1395
1396 /*
1397 * Extract a normalized version of the content type, with any
1398 * spaces suppressed, all letters lowercased, and no trailing ";"
1399 * or parameters.
1400 *
1401 * Note that we will silently remove even invalid whitespace. For
1402 * example, "text / plain" is specifically forbidden by RFC 2616,
1403 * but "text/plain" is the only reasonable output, and this keeps
1404 * our code simple.
1405 *
1406 * If the "charset" argument is not NULL, store the value of any
1407 * charset parameter there.
1408 *
1409 * Example:
1410 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1411 * "text / plain" -> "text/plain"
1412 */
1413 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1414 struct strbuf *charset)
1415 {
1416 const char *p;
1417
1418 strbuf_reset(type);
1419 strbuf_grow(type, raw->len);
1420 for (p = raw->buf; *p; p++) {
1421 if (isspace(*p))
1422 continue;
1423 if (*p == ';') {
1424 p++;
1425 break;
1426 }
1427 strbuf_addch(type, tolower(*p));
1428 }
1429
1430 if (!charset)
1431 return;
1432
1433 strbuf_reset(charset);
1434 while (*p) {
1435 while (isspace(*p) || *p == ';')
1436 p++;
1437 if (!extract_param(p, "charset", charset))
1438 return;
1439 while (*p && !isspace(*p))
1440 p++;
1441 }
1442
1443 if (!charset->len && starts_with(type->buf, "text/"))
1444 strbuf_addstr(charset, "ISO-8859-1");
1445 }
1446
1447 static void write_accept_language(struct strbuf *buf)
1448 {
1449 /*
1450 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1451 * that, q-value will be smaller than 0.001, the minimum q-value the
1452 * HTTP specification allows. See
1453 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1454 */
1455 const int MAX_DECIMAL_PLACES = 3;
1456 const int MAX_LANGUAGE_TAGS = 1000;
1457 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1458 char **language_tags = NULL;
1459 int num_langs = 0;
1460 const char *s = get_preferred_languages();
1461 int i;
1462 struct strbuf tag = STRBUF_INIT;
1463
1464 /* Don't add Accept-Language header if no language is preferred. */
1465 if (!s)
1466 return;
1467
1468 /*
1469 * Split the colon-separated string of preferred languages into
1470 * language_tags array.
1471 */
1472 do {
1473 /* collect language tag */
1474 for (; *s && (isalnum(*s) || *s == '_'); s++)
1475 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1476
1477 /* skip .codeset, @modifier and any other unnecessary parts */
1478 while (*s && *s != ':')
1479 s++;
1480
1481 if (tag.len) {
1482 num_langs++;
1483 REALLOC_ARRAY(language_tags, num_langs);
1484 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1485 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1486 break;
1487 }
1488 } while (*s++);
1489
1490 /* write Accept-Language header into buf */
1491 if (num_langs) {
1492 int last_buf_len = 0;
1493 int max_q;
1494 int decimal_places;
1495 char q_format[32];
1496
1497 /* add '*' */
1498 REALLOC_ARRAY(language_tags, num_langs + 1);
1499 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1500
1501 /* compute decimal_places */
1502 for (max_q = 1, decimal_places = 0;
1503 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1504 decimal_places++, max_q *= 10)
1505 ;
1506
1507 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1508
1509 strbuf_addstr(buf, "Accept-Language: ");
1510
1511 for (i = 0; i < num_langs; i++) {
1512 if (i > 0)
1513 strbuf_addstr(buf, ", ");
1514
1515 strbuf_addstr(buf, language_tags[i]);
1516
1517 if (i > 0)
1518 strbuf_addf(buf, q_format, max_q - i);
1519
1520 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1521 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1522 break;
1523 }
1524
1525 last_buf_len = buf->len;
1526 }
1527 }
1528
1529 /* free language tags -- last one is a static '*' */
1530 for (i = 0; i < num_langs - 1; i++)
1531 free(language_tags[i]);
1532 free(language_tags);
1533 }
1534
1535 /*
1536 * Get an Accept-Language header which indicates user's preferred languages.
1537 *
1538 * Examples:
1539 * LANGUAGE= -> ""
1540 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1541 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1542 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1543 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1544 * LANGUAGE= LANG=C -> ""
1545 */
1546 static const char *get_accept_language(void)
1547 {
1548 if (!cached_accept_language) {
1549 struct strbuf buf = STRBUF_INIT;
1550 write_accept_language(&buf);
1551 if (buf.len > 0)
1552 cached_accept_language = strbuf_detach(&buf, NULL);
1553 }
1554
1555 return cached_accept_language;
1556 }
1557
1558 static void http_opt_request_remainder(CURL *curl, off_t pos)
1559 {
1560 char buf[128];
1561 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1562 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1563 }
1564
1565 /* http_request() targets */
1566 #define HTTP_REQUEST_STRBUF 0
1567 #define HTTP_REQUEST_FILE 1
1568
1569 static int http_request(const char *url,
1570 void *result, int target,
1571 const struct http_get_options *options)
1572 {
1573 struct active_request_slot *slot;
1574 struct slot_results results;
1575 struct curl_slist *headers = http_copy_default_headers();
1576 struct strbuf buf = STRBUF_INIT;
1577 const char *accept_language;
1578 int ret;
1579
1580 slot = get_active_slot();
1581 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1582
1583 if (result == NULL) {
1584 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1585 } else {
1586 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1587 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1588
1589 if (target == HTTP_REQUEST_FILE) {
1590 off_t posn = ftello(result);
1591 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1592 fwrite);
1593 if (posn > 0)
1594 http_opt_request_remainder(slot->curl, posn);
1595 } else
1596 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1597 fwrite_buffer);
1598 }
1599
1600 accept_language = get_accept_language();
1601
1602 if (accept_language)
1603 headers = curl_slist_append(headers, accept_language);
1604
1605 strbuf_addstr(&buf, "Pragma:");
1606 if (options && options->no_cache)
1607 strbuf_addstr(&buf, " no-cache");
1608 if (options && options->keep_error)
1609 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1610
1611 headers = curl_slist_append(headers, buf.buf);
1612
1613 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1614 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1615 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1616
1617 ret = run_one_slot(slot, &results);
1618
1619 if (options && options->content_type) {
1620 struct strbuf raw = STRBUF_INIT;
1621 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1622 extract_content_type(&raw, options->content_type,
1623 options->charset);
1624 strbuf_release(&raw);
1625 }
1626
1627 if (options && options->effective_url)
1628 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1629 options->effective_url);
1630
1631 curl_slist_free_all(headers);
1632 strbuf_release(&buf);
1633
1634 return ret;
1635 }
1636
1637 /*
1638 * Update the "base" url to a more appropriate value, as deduced by
1639 * redirects seen when requesting a URL starting with "url".
1640 *
1641 * The "asked" parameter is a URL that we asked curl to access, and must begin
1642 * with "base".
1643 *
1644 * The "got" parameter is the URL that curl reported to us as where we ended
1645 * up.
1646 *
1647 * Returns 1 if we updated the base url, 0 otherwise.
1648 *
1649 * Our basic strategy is to compare "base" and "asked" to find the bits
1650 * specific to our request. We then strip those bits off of "got" to yield the
1651 * new base. So for example, if our base is "http://example.com/foo.git",
1652 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1653 * with "https://other.example.com/foo.git/info/refs". We would want the
1654 * new URL to become "https://other.example.com/foo.git".
1655 *
1656 * Note that this assumes a sane redirect scheme. It's entirely possible
1657 * in the example above to end up at a URL that does not even end in
1658 * "info/refs". In such a case we simply punt, as there is not much we can
1659 * do (and such a scheme is unlikely to represent a real git repository,
1660 * which means we are likely about to abort anyway).
1661 */
1662 static int update_url_from_redirect(struct strbuf *base,
1663 const char *asked,
1664 const struct strbuf *got)
1665 {
1666 const char *tail;
1667 size_t tail_len;
1668
1669 if (!strcmp(asked, got->buf))
1670 return 0;
1671
1672 if (!skip_prefix(asked, base->buf, &tail))
1673 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1674 asked, base->buf);
1675
1676 tail_len = strlen(tail);
1677
1678 if (got->len < tail_len ||
1679 strcmp(tail, got->buf + got->len - tail_len))
1680 return 0; /* insane redirect scheme */
1681
1682 strbuf_reset(base);
1683 strbuf_add(base, got->buf, got->len - tail_len);
1684 return 1;
1685 }
1686
1687 static int http_request_reauth(const char *url,
1688 void *result, int target,
1689 struct http_get_options *options)
1690 {
1691 int ret = http_request(url, result, target, options);
1692
1693 if (options && options->effective_url && options->base_url) {
1694 if (update_url_from_redirect(options->base_url,
1695 url, options->effective_url)) {
1696 credential_from_url(&http_auth, options->base_url->buf);
1697 url = options->effective_url->buf;
1698 }
1699 }
1700
1701 if (ret != HTTP_REAUTH)
1702 return ret;
1703
1704 /*
1705 * If we are using KEEP_ERROR, the previous request may have
1706 * put cruft into our output stream; we should clear it out before
1707 * making our next request. We only know how to do this for
1708 * the strbuf case, but that is enough to satisfy current callers.
1709 */
1710 if (options && options->keep_error) {
1711 switch (target) {
1712 case HTTP_REQUEST_STRBUF:
1713 strbuf_reset(result);
1714 break;
1715 default:
1716 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1717 }
1718 }
1719
1720 credential_fill(&http_auth);
1721
1722 return http_request(url, result, target, options);
1723 }
1724
1725 int http_get_strbuf(const char *url,
1726 struct strbuf *result,
1727 struct http_get_options *options)
1728 {
1729 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1730 }
1731
1732 /*
1733 * Downloads a URL and stores the result in the given file.
1734 *
1735 * If a previous interrupted download is detected (i.e. a previous temporary
1736 * file is still around) the download is resumed.
1737 */
1738 static int http_get_file(const char *url, const char *filename,
1739 struct http_get_options *options)
1740 {
1741 int ret;
1742 struct strbuf tmpfile = STRBUF_INIT;
1743 FILE *result;
1744
1745 strbuf_addf(&tmpfile, "%s.temp", filename);
1746 result = fopen(tmpfile.buf, "a");
1747 if (!result) {
1748 error("Unable to open local file %s", tmpfile.buf);
1749 ret = HTTP_ERROR;
1750 goto cleanup;
1751 }
1752
1753 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1754 fclose(result);
1755
1756 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1757 ret = HTTP_ERROR;
1758 cleanup:
1759 strbuf_release(&tmpfile);
1760 return ret;
1761 }
1762
1763 int http_fetch_ref(const char *base, struct ref *ref)
1764 {
1765 struct http_get_options options = {0};
1766 char *url;
1767 struct strbuf buffer = STRBUF_INIT;
1768 int ret = -1;
1769
1770 options.no_cache = 1;
1771
1772 url = quote_ref_url(base, ref->name);
1773 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1774 strbuf_rtrim(&buffer);
1775 if (buffer.len == 40)
1776 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1777 else if (starts_with(buffer.buf, "ref: ")) {
1778 ref->symref = xstrdup(buffer.buf + 5);
1779 ret = 0;
1780 }
1781 }
1782
1783 strbuf_release(&buffer);
1784 free(url);
1785 return ret;
1786 }
1787
1788 /* Helpers for fetching packs */
1789 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1790 {
1791 char *url, *tmp;
1792 struct strbuf buf = STRBUF_INIT;
1793
1794 if (http_is_verbose)
1795 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1796
1797 end_url_with_slash(&buf, base_url);
1798 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1799 url = strbuf_detach(&buf, NULL);
1800
1801 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1802 tmp = strbuf_detach(&buf, NULL);
1803
1804 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1805 error("Unable to get pack index %s", url);
1806 free(tmp);
1807 tmp = NULL;
1808 }
1809
1810 free(url);
1811 return tmp;
1812 }
1813
1814 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1815 unsigned char *sha1, const char *base_url)
1816 {
1817 struct packed_git *new_pack;
1818 char *tmp_idx = NULL;
1819 int ret;
1820
1821 if (has_pack_index(sha1)) {
1822 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1823 if (!new_pack)
1824 return -1; /* parse_pack_index() already issued error message */
1825 goto add_pack;
1826 }
1827
1828 tmp_idx = fetch_pack_index(sha1, base_url);
1829 if (!tmp_idx)
1830 return -1;
1831
1832 new_pack = parse_pack_index(sha1, tmp_idx);
1833 if (!new_pack) {
1834 unlink(tmp_idx);
1835 free(tmp_idx);
1836
1837 return -1; /* parse_pack_index() already issued error message */
1838 }
1839
1840 ret = verify_pack_index(new_pack);
1841 if (!ret) {
1842 close_pack_index(new_pack);
1843 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1844 }
1845 free(tmp_idx);
1846 if (ret)
1847 return -1;
1848
1849 add_pack:
1850 new_pack->next = *packs_head;
1851 *packs_head = new_pack;
1852 return 0;
1853 }
1854
1855 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1856 {
1857 struct http_get_options options = {0};
1858 int ret = 0, i = 0;
1859 char *url, *data;
1860 struct strbuf buf = STRBUF_INIT;
1861 unsigned char sha1[20];
1862
1863 end_url_with_slash(&buf, base_url);
1864 strbuf_addstr(&buf, "objects/info/packs");
1865 url = strbuf_detach(&buf, NULL);
1866
1867 options.no_cache = 1;
1868 ret = http_get_strbuf(url, &buf, &options);
1869 if (ret != HTTP_OK)
1870 goto cleanup;
1871
1872 data = buf.buf;
1873 while (i < buf.len) {
1874 switch (data[i]) {
1875 case 'P':
1876 i++;
1877 if (i + 52 <= buf.len &&
1878 starts_with(data + i, " pack-") &&
1879 starts_with(data + i + 46, ".pack\n")) {
1880 get_sha1_hex(data + i + 6, sha1);
1881 fetch_and_setup_pack_index(packs_head, sha1,
1882 base_url);
1883 i += 51;
1884 break;
1885 }
1886 default:
1887 while (i < buf.len && data[i] != '\n')
1888 i++;
1889 }
1890 i++;
1891 }
1892
1893 cleanup:
1894 free(url);
1895 return ret;
1896 }
1897
1898 void release_http_pack_request(struct http_pack_request *preq)
1899 {
1900 if (preq->packfile != NULL) {
1901 fclose(preq->packfile);
1902 preq->packfile = NULL;
1903 }
1904 preq->slot = NULL;
1905 free(preq->url);
1906 free(preq);
1907 }
1908
1909 int finish_http_pack_request(struct http_pack_request *preq)
1910 {
1911 struct packed_git **lst;
1912 struct packed_git *p = preq->target;
1913 char *tmp_idx;
1914 size_t len;
1915 struct child_process ip = CHILD_PROCESS_INIT;
1916 const char *ip_argv[8];
1917
1918 close_pack_index(p);
1919
1920 fclose(preq->packfile);
1921 preq->packfile = NULL;
1922
1923 lst = preq->lst;
1924 while (*lst != p)
1925 lst = &((*lst)->next);
1926 *lst = (*lst)->next;
1927
1928 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1929 die("BUG: pack tmpfile does not end in .pack.temp?");
1930 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1931
1932 ip_argv[0] = "index-pack";
1933 ip_argv[1] = "-o";
1934 ip_argv[2] = tmp_idx;
1935 ip_argv[3] = preq->tmpfile;
1936 ip_argv[4] = NULL;
1937
1938 ip.argv = ip_argv;
1939 ip.git_cmd = 1;
1940 ip.no_stdin = 1;
1941 ip.no_stdout = 1;
1942
1943 if (run_command(&ip)) {
1944 unlink(preq->tmpfile);
1945 unlink(tmp_idx);
1946 free(tmp_idx);
1947 return -1;
1948 }
1949
1950 unlink(sha1_pack_index_name(p->sha1));
1951
1952 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1953 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1954 free(tmp_idx);
1955 return -1;
1956 }
1957
1958 install_packed_git(p);
1959 free(tmp_idx);
1960 return 0;
1961 }
1962
1963 struct http_pack_request *new_http_pack_request(
1964 struct packed_git *target, const char *base_url)
1965 {
1966 off_t prev_posn = 0;
1967 struct strbuf buf = STRBUF_INIT;
1968 struct http_pack_request *preq;
1969
1970 preq = xcalloc(1, sizeof(*preq));
1971 preq->target = target;
1972
1973 end_url_with_slash(&buf, base_url);
1974 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
1975 sha1_to_hex(target->sha1));
1976 preq->url = strbuf_detach(&buf, NULL);
1977
1978 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
1979 sha1_pack_name(target->sha1));
1980 preq->packfile = fopen(preq->tmpfile, "a");
1981 if (!preq->packfile) {
1982 error("Unable to open local file %s for pack",
1983 preq->tmpfile);
1984 goto abort;
1985 }
1986
1987 preq->slot = get_active_slot();
1988 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
1989 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
1990 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
1991 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
1992 no_pragma_header);
1993
1994 /*
1995 * If there is data present from a previous transfer attempt,
1996 * resume where it left off
1997 */
1998 prev_posn = ftello(preq->packfile);
1999 if (prev_posn>0) {
2000 if (http_is_verbose)
2001 fprintf(stderr,
2002 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2003 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2004 http_opt_request_remainder(preq->slot->curl, prev_posn);
2005 }
2006
2007 return preq;
2008
2009 abort:
2010 free(preq->url);
2011 free(preq);
2012 return NULL;
2013 }
2014
2015 /* Helpers for fetching objects (loose) */
2016 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2017 void *data)
2018 {
2019 unsigned char expn[4096];
2020 size_t size = eltsize * nmemb;
2021 int posn = 0;
2022 struct http_object_request *freq = data;
2023 struct active_request_slot *slot = freq->slot;
2024
2025 if (slot) {
2026 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2027 &slot->http_code);
2028 if (c != CURLE_OK)
2029 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2030 curl_easy_strerror(c));
2031 if (slot->http_code >= 400)
2032 return size;
2033 }
2034
2035 do {
2036 ssize_t retval = xwrite(freq->localfile,
2037 (char *) ptr + posn, size - posn);
2038 if (retval < 0)
2039 return posn;
2040 posn += retval;
2041 } while (posn < size);
2042
2043 freq->stream.avail_in = size;
2044 freq->stream.next_in = (void *)ptr;
2045 do {
2046 freq->stream.next_out = expn;
2047 freq->stream.avail_out = sizeof(expn);
2048 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2049 git_SHA1_Update(&freq->c, expn,
2050 sizeof(expn) - freq->stream.avail_out);
2051 } while (freq->stream.avail_in && freq->zret == Z_OK);
2052 return size;
2053 }
2054
2055 struct http_object_request *new_http_object_request(const char *base_url,
2056 unsigned char *sha1)
2057 {
2058 char *hex = sha1_to_hex(sha1);
2059 const char *filename;
2060 char prevfile[PATH_MAX];
2061 int prevlocal;
2062 char prev_buf[PREV_BUF_SIZE];
2063 ssize_t prev_read = 0;
2064 off_t prev_posn = 0;
2065 struct http_object_request *freq;
2066
2067 freq = xcalloc(1, sizeof(*freq));
2068 hashcpy(freq->sha1, sha1);
2069 freq->localfile = -1;
2070
2071 filename = sha1_file_name(sha1);
2072 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2073 "%s.temp", filename);
2074
2075 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2076 unlink_or_warn(prevfile);
2077 rename(freq->tmpfile, prevfile);
2078 unlink_or_warn(freq->tmpfile);
2079
2080 if (freq->localfile != -1)
2081 error("fd leakage in start: %d", freq->localfile);
2082 freq->localfile = open(freq->tmpfile,
2083 O_WRONLY | O_CREAT | O_EXCL, 0666);
2084 /*
2085 * This could have failed due to the "lazy directory creation";
2086 * try to mkdir the last path component.
2087 */
2088 if (freq->localfile < 0 && errno == ENOENT) {
2089 char *dir = strrchr(freq->tmpfile, '/');
2090 if (dir) {
2091 *dir = 0;
2092 mkdir(freq->tmpfile, 0777);
2093 *dir = '/';
2094 }
2095 freq->localfile = open(freq->tmpfile,
2096 O_WRONLY | O_CREAT | O_EXCL, 0666);
2097 }
2098
2099 if (freq->localfile < 0) {
2100 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2101 goto abort;
2102 }
2103
2104 git_inflate_init(&freq->stream);
2105
2106 git_SHA1_Init(&freq->c);
2107
2108 freq->url = get_remote_object_url(base_url, hex, 0);
2109
2110 /*
2111 * If a previous temp file is present, process what was already
2112 * fetched.
2113 */
2114 prevlocal = open(prevfile, O_RDONLY);
2115 if (prevlocal != -1) {
2116 do {
2117 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2118 if (prev_read>0) {
2119 if (fwrite_sha1_file(prev_buf,
2120 1,
2121 prev_read,
2122 freq) == prev_read) {
2123 prev_posn += prev_read;
2124 } else {
2125 prev_read = -1;
2126 }
2127 }
2128 } while (prev_read > 0);
2129 close(prevlocal);
2130 }
2131 unlink_or_warn(prevfile);
2132
2133 /*
2134 * Reset inflate/SHA1 if there was an error reading the previous temp
2135 * file; also rewind to the beginning of the local file.
2136 */
2137 if (prev_read == -1) {
2138 memset(&freq->stream, 0, sizeof(freq->stream));
2139 git_inflate_init(&freq->stream);
2140 git_SHA1_Init(&freq->c);
2141 if (prev_posn>0) {
2142 prev_posn = 0;
2143 lseek(freq->localfile, 0, SEEK_SET);
2144 if (ftruncate(freq->localfile, 0) < 0) {
2145 error_errno("Couldn't truncate temporary file %s",
2146 freq->tmpfile);
2147 goto abort;
2148 }
2149 }
2150 }
2151
2152 freq->slot = get_active_slot();
2153
2154 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2155 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2156 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2157 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2158 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2159 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2160
2161 /*
2162 * If we have successfully processed data from a previous fetch
2163 * attempt, only fetch the data we don't already have.
2164 */
2165 if (prev_posn>0) {
2166 if (http_is_verbose)
2167 fprintf(stderr,
2168 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2169 hex, (uintmax_t)prev_posn);
2170 http_opt_request_remainder(freq->slot->curl, prev_posn);
2171 }
2172
2173 return freq;
2174
2175 abort:
2176 free(freq->url);
2177 free(freq);
2178 return NULL;
2179 }
2180
2181 void process_http_object_request(struct http_object_request *freq)
2182 {
2183 if (freq->slot == NULL)
2184 return;
2185 freq->curl_result = freq->slot->curl_result;
2186 freq->http_code = freq->slot->http_code;
2187 freq->slot = NULL;
2188 }
2189
2190 int finish_http_object_request(struct http_object_request *freq)
2191 {
2192 struct stat st;
2193
2194 close(freq->localfile);
2195 freq->localfile = -1;
2196
2197 process_http_object_request(freq);
2198
2199 if (freq->http_code == 416) {
2200 warning("requested range invalid; we may already have all the data.");
2201 } else if (freq->curl_result != CURLE_OK) {
2202 if (stat(freq->tmpfile, &st) == 0)
2203 if (st.st_size == 0)
2204 unlink_or_warn(freq->tmpfile);
2205 return -1;
2206 }
2207
2208 git_inflate_end(&freq->stream);
2209 git_SHA1_Final(freq->real_sha1, &freq->c);
2210 if (freq->zret != Z_STREAM_END) {
2211 unlink_or_warn(freq->tmpfile);
2212 return -1;
2213 }
2214 if (hashcmp(freq->sha1, freq->real_sha1)) {
2215 unlink_or_warn(freq->tmpfile);
2216 return -1;
2217 }
2218 freq->rename =
2219 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2220
2221 return freq->rename;
2222 }
2223
2224 void abort_http_object_request(struct http_object_request *freq)
2225 {
2226 unlink_or_warn(freq->tmpfile);
2227
2228 release_http_object_request(freq);
2229 }
2230
2231 void release_http_object_request(struct http_object_request *freq)
2232 {
2233 if (freq->localfile != -1) {
2234 close(freq->localfile);
2235 freq->localfile = -1;
2236 }
2237 if (freq->url != NULL) {
2238 free(freq->url);
2239 freq->url = NULL;
2240 }
2241 if (freq->slot != NULL) {
2242 freq->slot->callback_func = NULL;
2243 freq->slot->callback_data = NULL;
2244 release_active_slot(freq->slot);
2245 freq->slot = NULL;
2246 }
2247 }
git for Debian