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sub-process: move sub-process functions into separate files
[git/debian.git] / http.c
blob96d84bbed3f66153cc3d817f2b342dc5d1600574
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 = -1;
113
114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
115
116 #if LIBCURL_VERSION_NUM >= 0x071700
117 /* Use CURLOPT_KEYPASSWD as is */
118 #elif LIBCURL_VERSION_NUM >= 0x070903
119 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
120 #else
121 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
122 #endif
123
124 static struct credential cert_auth = CREDENTIAL_INIT;
125 static int ssl_cert_password_required;
126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
127 static unsigned long http_auth_methods = CURLAUTH_ANY;
128 static int http_auth_methods_restricted;
129 /* Modes for which empty_auth cannot actually help us. */
130 static unsigned long empty_auth_useless =
131 CURLAUTH_BASIC
132 #ifdef CURLAUTH_DIGEST_IE
133 | CURLAUTH_DIGEST_IE
134 #endif
135 | CURLAUTH_DIGEST;
136 #endif
137
138 static struct curl_slist *pragma_header;
139 static struct curl_slist *no_pragma_header;
140 static struct curl_slist *extra_http_headers;
141
142 static struct active_request_slot *active_queue_head;
143
144 static char *cached_accept_language;
145
146 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
147 {
148 size_t size = eltsize * nmemb;
149 struct buffer *buffer = buffer_;
150
151 if (size > buffer->buf.len - buffer->posn)
152 size = buffer->buf.len - buffer->posn;
153 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
154 buffer->posn += size;
155
156 return size;
157 }
158
159 #ifndef NO_CURL_IOCTL
160 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
161 {
162 struct buffer *buffer = clientp;
163
164 switch (cmd) {
165 case CURLIOCMD_NOP:
166 return CURLIOE_OK;
167
168 case CURLIOCMD_RESTARTREAD:
169 buffer->posn = 0;
170 return CURLIOE_OK;
171
172 default:
173 return CURLIOE_UNKNOWNCMD;
174 }
175 }
176 #endif
177
178 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
179 {
180 size_t size = eltsize * nmemb;
181 struct strbuf *buffer = buffer_;
182
183 strbuf_add(buffer, ptr, size);
184 return size;
185 }
186
187 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
188 {
189 return eltsize * nmemb;
190 }
191
192 static void closedown_active_slot(struct active_request_slot *slot)
193 {
194 active_requests--;
195 slot->in_use = 0;
196 }
197
198 static void finish_active_slot(struct active_request_slot *slot)
199 {
200 closedown_active_slot(slot);
201 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
202
203 if (slot->finished != NULL)
204 (*slot->finished) = 1;
205
206 /* Store slot results so they can be read after the slot is reused */
207 if (slot->results != NULL) {
208 slot->results->curl_result = slot->curl_result;
209 slot->results->http_code = slot->http_code;
210 #if LIBCURL_VERSION_NUM >= 0x070a08
211 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
212 &slot->results->auth_avail);
213 #else
214 slot->results->auth_avail = 0;
215 #endif
216
217 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
218 &slot->results->http_connectcode);
219 }
220
221 /* Run callback if appropriate */
222 if (slot->callback_func != NULL)
223 slot->callback_func(slot->callback_data);
224 }
225
226 static void xmulti_remove_handle(struct active_request_slot *slot)
227 {
228 #ifdef USE_CURL_MULTI
229 curl_multi_remove_handle(curlm, slot->curl);
230 #endif
231 }
232
233 #ifdef USE_CURL_MULTI
234 static void process_curl_messages(void)
235 {
236 int num_messages;
237 struct active_request_slot *slot;
238 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
239
240 while (curl_message != NULL) {
241 if (curl_message->msg == CURLMSG_DONE) {
242 int curl_result = curl_message->data.result;
243 slot = active_queue_head;
244 while (slot != NULL &&
245 slot->curl != curl_message->easy_handle)
246 slot = slot->next;
247 if (slot != NULL) {
248 xmulti_remove_handle(slot);
249 slot->curl_result = curl_result;
250 finish_active_slot(slot);
251 } else {
252 fprintf(stderr, "Received DONE message for unknown request!\n");
253 }
254 } else {
255 fprintf(stderr, "Unknown CURL message received: %d\n",
256 (int)curl_message->msg);
257 }
258 curl_message = curl_multi_info_read(curlm, &num_messages);
259 }
260 }
261 #endif
262
263 static int http_options(const char *var, const char *value, void *cb)
264 {
265 if (!strcmp("http.sslverify", var)) {
266 curl_ssl_verify = git_config_bool(var, value);
267 return 0;
268 }
269 if (!strcmp("http.sslcipherlist", var))
270 return git_config_string(&ssl_cipherlist, var, value);
271 if (!strcmp("http.sslversion", var))
272 return git_config_string(&ssl_version, var, value);
273 if (!strcmp("http.sslcert", var))
274 return git_config_string(&ssl_cert, var, value);
275 #if LIBCURL_VERSION_NUM >= 0x070903
276 if (!strcmp("http.sslkey", var))
277 return git_config_string(&ssl_key, var, value);
278 #endif
279 #if LIBCURL_VERSION_NUM >= 0x070908
280 if (!strcmp("http.sslcapath", var))
281 return git_config_pathname(&ssl_capath, var, value);
282 #endif
283 if (!strcmp("http.sslcainfo", var))
284 return git_config_pathname(&ssl_cainfo, var, value);
285 if (!strcmp("http.sslcertpasswordprotected", var)) {
286 ssl_cert_password_required = git_config_bool(var, value);
287 return 0;
288 }
289 if (!strcmp("http.ssltry", var)) {
290 curl_ssl_try = git_config_bool(var, value);
291 return 0;
292 }
293 if (!strcmp("http.minsessions", var)) {
294 min_curl_sessions = git_config_int(var, value);
295 #ifndef USE_CURL_MULTI
296 if (min_curl_sessions > 1)
297 min_curl_sessions = 1;
298 #endif
299 return 0;
300 }
301 #ifdef USE_CURL_MULTI
302 if (!strcmp("http.maxrequests", var)) {
303 max_requests = git_config_int(var, value);
304 return 0;
305 }
306 #endif
307 if (!strcmp("http.lowspeedlimit", var)) {
308 curl_low_speed_limit = (long)git_config_int(var, value);
309 return 0;
310 }
311 if (!strcmp("http.lowspeedtime", var)) {
312 curl_low_speed_time = (long)git_config_int(var, value);
313 return 0;
314 }
315
316 if (!strcmp("http.noepsv", var)) {
317 curl_ftp_no_epsv = git_config_bool(var, value);
318 return 0;
319 }
320 if (!strcmp("http.proxy", var))
321 return git_config_string(&curl_http_proxy, var, value);
322
323 if (!strcmp("http.proxyauthmethod", var))
324 return git_config_string(&http_proxy_authmethod, var, value);
325
326 if (!strcmp("http.cookiefile", var))
327 return git_config_pathname(&curl_cookie_file, var, value);
328 if (!strcmp("http.savecookies", var)) {
329 curl_save_cookies = git_config_bool(var, value);
330 return 0;
331 }
332
333 if (!strcmp("http.postbuffer", var)) {
334 http_post_buffer = git_config_int(var, value);
335 if (http_post_buffer < LARGE_PACKET_MAX)
336 http_post_buffer = LARGE_PACKET_MAX;
337 return 0;
338 }
339
340 if (!strcmp("http.useragent", var))
341 return git_config_string(&user_agent, var, value);
342
343 if (!strcmp("http.emptyauth", var)) {
344 if (value && !strcmp("auto", value))
345 curl_empty_auth = -1;
346 else
347 curl_empty_auth = git_config_bool(var, value);
348 return 0;
349 }
350
351 if (!strcmp("http.delegation", var)) {
352 #if LIBCURL_VERSION_NUM >= 0x071600
353 return git_config_string(&curl_deleg, var, value);
354 #else
355 warning(_("Delegation control is not supported with cURL < 7.22.0"));
356 return 0;
357 #endif
358 }
359
360 if (!strcmp("http.pinnedpubkey", var)) {
361 #if LIBCURL_VERSION_NUM >= 0x072c00
362 return git_config_pathname(&ssl_pinnedkey, var, value);
363 #else
364 warning(_("Public key pinning not supported with cURL < 7.44.0"));
365 return 0;
366 #endif
367 }
368
369 if (!strcmp("http.extraheader", var)) {
370 if (!value) {
371 return config_error_nonbool(var);
372 } else if (!*value) {
373 curl_slist_free_all(extra_http_headers);
374 extra_http_headers = NULL;
375 } else {
376 extra_http_headers =
377 curl_slist_append(extra_http_headers, value);
378 }
379 return 0;
380 }
381
382 if (!strcmp("http.followredirects", var)) {
383 if (value && !strcmp(value, "initial"))
384 http_follow_config = HTTP_FOLLOW_INITIAL;
385 else if (git_config_bool(var, value))
386 http_follow_config = HTTP_FOLLOW_ALWAYS;
387 else
388 http_follow_config = HTTP_FOLLOW_NONE;
389 return 0;
390 }
391
392 /* Fall back on the default ones */
393 return git_default_config(var, value, cb);
394 }
395
396 static int curl_empty_auth_enabled(void)
397 {
398 if (curl_empty_auth >= 0)
399 return curl_empty_auth;
400
401 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
402 /*
403 * Our libcurl is too old to do AUTH_ANY in the first place;
404 * just default to turning the feature off.
405 */
406 #else
407 /*
408 * In the automatic case, kick in the empty-auth
409 * hack as long as we would potentially try some
410 * method more exotic than "Basic" or "Digest".
411 *
412 * But only do this when this is our second or
413 * subsequent request, as by then we know what
414 * methods are available.
415 */
416 if (http_auth_methods_restricted &&
417 (http_auth_methods & ~empty_auth_useless))
418 return 1;
419 #endif
420 return 0;
421 }
422
423 static void init_curl_http_auth(CURL *result)
424 {
425 if (!http_auth.username || !*http_auth.username) {
426 if (curl_empty_auth_enabled())
427 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
428 return;
429 }
430
431 credential_fill(&http_auth);
432
433 #if LIBCURL_VERSION_NUM >= 0x071301
434 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
435 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
436 #else
437 {
438 static struct strbuf up = STRBUF_INIT;
439 /*
440 * Note that we assume we only ever have a single set of
441 * credentials in a given program run, so we do not have
442 * to worry about updating this buffer, only setting its
443 * initial value.
444 */
445 if (!up.len)
446 strbuf_addf(&up, "%s:%s",
447 http_auth.username, http_auth.password);
448 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
449 }
450 #endif
451 }
452
453 /* *var must be free-able */
454 static void var_override(const char **var, char *value)
455 {
456 if (value) {
457 free((void *)*var);
458 *var = xstrdup(value);
459 }
460 }
461
462 static void set_proxyauth_name_password(CURL *result)
463 {
464 #if LIBCURL_VERSION_NUM >= 0x071301
465 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
466 proxy_auth.username);
467 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
468 proxy_auth.password);
469 #else
470 struct strbuf s = STRBUF_INIT;
471
472 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
473 strbuf_addch(&s, ':');
474 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
475 curl_proxyuserpwd = strbuf_detach(&s, NULL);
476 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
477 #endif
478 }
479
480 static void init_curl_proxy_auth(CURL *result)
481 {
482 if (proxy_auth.username) {
483 if (!proxy_auth.password)
484 credential_fill(&proxy_auth);
485 set_proxyauth_name_password(result);
486 }
487
488 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
489
490 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
491 if (http_proxy_authmethod) {
492 int i;
493 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
494 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
495 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
496 proxy_authmethods[i].curlauth_param);
497 break;
498 }
499 }
500 if (i == ARRAY_SIZE(proxy_authmethods)) {
501 warning("unsupported proxy authentication method %s: using anyauth",
502 http_proxy_authmethod);
503 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
504 }
505 }
506 else
507 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
508 #endif
509 }
510
511 static int has_cert_password(void)
512 {
513 if (ssl_cert == NULL || ssl_cert_password_required != 1)
514 return 0;
515 if (!cert_auth.password) {
516 cert_auth.protocol = xstrdup("cert");
517 cert_auth.username = xstrdup("");
518 cert_auth.path = xstrdup(ssl_cert);
519 credential_fill(&cert_auth);
520 }
521 return 1;
522 }
523
524 #if LIBCURL_VERSION_NUM >= 0x071900
525 static void set_curl_keepalive(CURL *c)
526 {
527 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
528 }
529
530 #elif LIBCURL_VERSION_NUM >= 0x071000
531 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
532 {
533 int ka = 1;
534 int rc;
535 socklen_t len = (socklen_t)sizeof(ka);
536
537 if (type != CURLSOCKTYPE_IPCXN)
538 return 0;
539
540 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
541 if (rc < 0)
542 warning_errno("unable to set SO_KEEPALIVE on socket");
543
544 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
545 }
546
547 static void set_curl_keepalive(CURL *c)
548 {
549 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
550 }
551
552 #else
553 static void set_curl_keepalive(CURL *c)
554 {
555 /* not supported on older curl versions */
556 }
557 #endif
558
559 static void redact_sensitive_header(struct strbuf *header)
560 {
561 const char *sensitive_header;
562
563 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
564 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
565 /* The first token is the type, which is OK to log */
566 while (isspace(*sensitive_header))
567 sensitive_header++;
568 while (*sensitive_header && !isspace(*sensitive_header))
569 sensitive_header++;
570 /* Everything else is opaque and possibly sensitive */
571 strbuf_setlen(header, sensitive_header - header->buf);
572 strbuf_addstr(header, " <redacted>");
573 }
574 }
575
576 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
577 {
578 struct strbuf out = STRBUF_INIT;
579 struct strbuf **headers, **header;
580
581 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
582 text, (long)size, (long)size);
583 trace_strbuf(&trace_curl, &out);
584 strbuf_reset(&out);
585 strbuf_add(&out, ptr, size);
586 headers = strbuf_split_max(&out, '\n', 0);
587
588 for (header = headers; *header; header++) {
589 if (hide_sensitive_header)
590 redact_sensitive_header(*header);
591 strbuf_insert((*header), 0, text, strlen(text));
592 strbuf_insert((*header), strlen(text), ": ", 2);
593 strbuf_rtrim((*header));
594 strbuf_addch((*header), '\n');
595 trace_strbuf(&trace_curl, (*header));
596 }
597 strbuf_list_free(headers);
598 strbuf_release(&out);
599 }
600
601 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
602 {
603 size_t i;
604 struct strbuf out = STRBUF_INIT;
605 unsigned int width = 60;
606
607 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
608 text, (long)size, (long)size);
609 trace_strbuf(&trace_curl, &out);
610
611 for (i = 0; i < size; i += width) {
612 size_t w;
613
614 strbuf_reset(&out);
615 strbuf_addf(&out, "%s: ", text);
616 for (w = 0; (w < width) && (i + w < size); w++) {
617 unsigned char ch = ptr[i + w];
618
619 strbuf_addch(&out,
620 (ch >= 0x20) && (ch < 0x80)
621 ? ch : '.');
622 }
623 strbuf_addch(&out, '\n');
624 trace_strbuf(&trace_curl, &out);
625 }
626 strbuf_release(&out);
627 }
628
629 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
630 {
631 const char *text;
632 enum { NO_FILTER = 0, DO_FILTER = 1 };
633
634 switch (type) {
635 case CURLINFO_TEXT:
636 trace_printf_key(&trace_curl, "== Info: %s", data);
637 default: /* we ignore unknown types by default */
638 return 0;
639
640 case CURLINFO_HEADER_OUT:
641 text = "=> Send header";
642 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
643 break;
644 case CURLINFO_DATA_OUT:
645 text = "=> Send data";
646 curl_dump_data(text, (unsigned char *)data, size);
647 break;
648 case CURLINFO_SSL_DATA_OUT:
649 text = "=> Send SSL data";
650 curl_dump_data(text, (unsigned char *)data, size);
651 break;
652 case CURLINFO_HEADER_IN:
653 text = "<= Recv header";
654 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
655 break;
656 case CURLINFO_DATA_IN:
657 text = "<= Recv data";
658 curl_dump_data(text, (unsigned char *)data, size);
659 break;
660 case CURLINFO_SSL_DATA_IN:
661 text = "<= Recv SSL data";
662 curl_dump_data(text, (unsigned char *)data, size);
663 break;
664 }
665 return 0;
666 }
667
668 void setup_curl_trace(CURL *handle)
669 {
670 if (!trace_want(&trace_curl))
671 return;
672 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
673 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
674 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
675 }
676
677 static long get_curl_allowed_protocols(int from_user)
678 {
679 long allowed_protocols = 0;
680
681 if (is_transport_allowed("http", from_user))
682 allowed_protocols |= CURLPROTO_HTTP;
683 if (is_transport_allowed("https", from_user))
684 allowed_protocols |= CURLPROTO_HTTPS;
685 if (is_transport_allowed("ftp", from_user))
686 allowed_protocols |= CURLPROTO_FTP;
687 if (is_transport_allowed("ftps", from_user))
688 allowed_protocols |= CURLPROTO_FTPS;
689
690 return allowed_protocols;
691 }
692
693 static CURL *get_curl_handle(void)
694 {
695 CURL *result = curl_easy_init();
696
697 if (!result)
698 die("curl_easy_init failed");
699
700 if (!curl_ssl_verify) {
701 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
702 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
703 } else {
704 /* Verify authenticity of the peer's certificate */
705 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
706 /* The name in the cert must match whom we tried to connect */
707 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
708 }
709
710 #if LIBCURL_VERSION_NUM >= 0x070907
711 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
712 #endif
713 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
714 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
715 #endif
716
717 #if LIBCURL_VERSION_NUM >= 0x071600
718 if (curl_deleg) {
719 int i;
720 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
721 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
722 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
723 curl_deleg_levels[i].curl_deleg_param);
724 break;
725 }
726 }
727 if (i == ARRAY_SIZE(curl_deleg_levels))
728 warning("Unknown delegation method '%s': using default",
729 curl_deleg);
730 }
731 #endif
732
733 if (http_proactive_auth)
734 init_curl_http_auth(result);
735
736 if (getenv("GIT_SSL_VERSION"))
737 ssl_version = getenv("GIT_SSL_VERSION");
738 if (ssl_version && *ssl_version) {
739 int i;
740 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
741 if (!strcmp(ssl_version, sslversions[i].name)) {
742 curl_easy_setopt(result, CURLOPT_SSLVERSION,
743 sslversions[i].ssl_version);
744 break;
745 }
746 }
747 if (i == ARRAY_SIZE(sslversions))
748 warning("unsupported ssl version %s: using default",
749 ssl_version);
750 }
751
752 if (getenv("GIT_SSL_CIPHER_LIST"))
753 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
754 if (ssl_cipherlist != NULL && *ssl_cipherlist)
755 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
756 ssl_cipherlist);
757
758 if (ssl_cert != NULL)
759 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
760 if (has_cert_password())
761 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
762 #if LIBCURL_VERSION_NUM >= 0x070903
763 if (ssl_key != NULL)
764 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
765 #endif
766 #if LIBCURL_VERSION_NUM >= 0x070908
767 if (ssl_capath != NULL)
768 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
769 #endif
770 #if LIBCURL_VERSION_NUM >= 0x072c00
771 if (ssl_pinnedkey != NULL)
772 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
773 #endif
774 if (ssl_cainfo != NULL)
775 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
776
777 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
778 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
779 curl_low_speed_limit);
780 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
781 curl_low_speed_time);
782 }
783
784 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
785 #if LIBCURL_VERSION_NUM >= 0x071301
786 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
787 #elif LIBCURL_VERSION_NUM >= 0x071101
788 curl_easy_setopt(result, CURLOPT_POST301, 1);
789 #endif
790 #if LIBCURL_VERSION_NUM >= 0x071304
791 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
792 get_curl_allowed_protocols(0));
793 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
794 get_curl_allowed_protocols(-1));
795 #else
796 warning("protocol restrictions not applied to curl redirects because\n"
797 "your curl version is too old (>= 7.19.4)");
798 #endif
799 if (getenv("GIT_CURL_VERBOSE"))
800 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
801 setup_curl_trace(result);
802
803 curl_easy_setopt(result, CURLOPT_USERAGENT,
804 user_agent ? user_agent : git_user_agent());
805
806 if (curl_ftp_no_epsv)
807 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
808
809 #ifdef CURLOPT_USE_SSL
810 if (curl_ssl_try)
811 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
812 #endif
813
814 /*
815 * CURL also examines these variables as a fallback; but we need to query
816 * them here in order to decide whether to prompt for missing password (cf.
817 * init_curl_proxy_auth()).
818 *
819 * Unlike many other common environment variables, these are historically
820 * lowercase only. It appears that CURL did not know this and implemented
821 * only uppercase variants, which was later corrected to take both - with
822 * the exception of http_proxy, which is lowercase only also in CURL. As
823 * the lowercase versions are the historical quasi-standard, they take
824 * precedence here, as in CURL.
825 */
826 if (!curl_http_proxy) {
827 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
828 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
829 var_override(&curl_http_proxy, getenv("https_proxy"));
830 } else {
831 var_override(&curl_http_proxy, getenv("http_proxy"));
832 }
833 if (!curl_http_proxy) {
834 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
835 var_override(&curl_http_proxy, getenv("all_proxy"));
836 }
837 }
838
839 if (curl_http_proxy) {
840 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
841 #if LIBCURL_VERSION_NUM >= 0x071800
842 if (starts_with(curl_http_proxy, "socks5h"))
843 curl_easy_setopt(result,
844 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
845 else if (starts_with(curl_http_proxy, "socks5"))
846 curl_easy_setopt(result,
847 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
848 else if (starts_with(curl_http_proxy, "socks4a"))
849 curl_easy_setopt(result,
850 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
851 else if (starts_with(curl_http_proxy, "socks"))
852 curl_easy_setopt(result,
853 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
854 #endif
855 if (strstr(curl_http_proxy, "://"))
856 credential_from_url(&proxy_auth, curl_http_proxy);
857 else {
858 struct strbuf url = STRBUF_INIT;
859 strbuf_addf(&url, "http://%s", curl_http_proxy);
860 credential_from_url(&proxy_auth, url.buf);
861 strbuf_release(&url);
862 }
863
864 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
865 #if LIBCURL_VERSION_NUM >= 0x071304
866 var_override(&curl_no_proxy, getenv("NO_PROXY"));
867 var_override(&curl_no_proxy, getenv("no_proxy"));
868 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
869 #endif
870 }
871 init_curl_proxy_auth(result);
872
873 set_curl_keepalive(result);
874
875 return result;
876 }
877
878 static void set_from_env(const char **var, const char *envname)
879 {
880 const char *val = getenv(envname);
881 if (val)
882 *var = val;
883 }
884
885 void http_init(struct remote *remote, const char *url, int proactive_auth)
886 {
887 char *low_speed_limit;
888 char *low_speed_time;
889 char *normalized_url;
890 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
891
892 config.section = "http";
893 config.key = NULL;
894 config.collect_fn = http_options;
895 config.cascade_fn = git_default_config;
896 config.cb = NULL;
897
898 http_is_verbose = 0;
899 normalized_url = url_normalize(url, &config.url);
900
901 git_config(urlmatch_config_entry, &config);
902 free(normalized_url);
903
904 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
905 die("curl_global_init failed");
906
907 http_proactive_auth = proactive_auth;
908
909 if (remote && remote->http_proxy)
910 curl_http_proxy = xstrdup(remote->http_proxy);
911
912 if (remote)
913 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
914
915 pragma_header = curl_slist_append(http_copy_default_headers(),
916 "Pragma: no-cache");
917 no_pragma_header = curl_slist_append(http_copy_default_headers(),
918 "Pragma:");
919
920 #ifdef USE_CURL_MULTI
921 {
922 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
923 if (http_max_requests != NULL)
924 max_requests = atoi(http_max_requests);
925 }
926
927 curlm = curl_multi_init();
928 if (!curlm)
929 die("curl_multi_init failed");
930 #endif
931
932 if (getenv("GIT_SSL_NO_VERIFY"))
933 curl_ssl_verify = 0;
934
935 set_from_env(&ssl_cert, "GIT_SSL_CERT");
936 #if LIBCURL_VERSION_NUM >= 0x070903
937 set_from_env(&ssl_key, "GIT_SSL_KEY");
938 #endif
939 #if LIBCURL_VERSION_NUM >= 0x070908
940 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
941 #endif
942 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
943
944 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
945
946 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
947 if (low_speed_limit != NULL)
948 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
949 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
950 if (low_speed_time != NULL)
951 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
952
953 if (curl_ssl_verify == -1)
954 curl_ssl_verify = 1;
955
956 curl_session_count = 0;
957 #ifdef USE_CURL_MULTI
958 if (max_requests < 1)
959 max_requests = DEFAULT_MAX_REQUESTS;
960 #endif
961
962 if (getenv("GIT_CURL_FTP_NO_EPSV"))
963 curl_ftp_no_epsv = 1;
964
965 if (url) {
966 credential_from_url(&http_auth, url);
967 if (!ssl_cert_password_required &&
968 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
969 starts_with(url, "https://"))
970 ssl_cert_password_required = 1;
971 }
972
973 #ifndef NO_CURL_EASY_DUPHANDLE
974 curl_default = get_curl_handle();
975 #endif
976 }
977
978 void http_cleanup(void)
979 {
980 struct active_request_slot *slot = active_queue_head;
981
982 while (slot != NULL) {
983 struct active_request_slot *next = slot->next;
984 if (slot->curl != NULL) {
985 xmulti_remove_handle(slot);
986 curl_easy_cleanup(slot->curl);
987 }
988 free(slot);
989 slot = next;
990 }
991 active_queue_head = NULL;
992
993 #ifndef NO_CURL_EASY_DUPHANDLE
994 curl_easy_cleanup(curl_default);
995 #endif
996
997 #ifdef USE_CURL_MULTI
998 curl_multi_cleanup(curlm);
999 #endif
1000 curl_global_cleanup();
1001
1002 curl_slist_free_all(extra_http_headers);
1003 extra_http_headers = NULL;
1004
1005 curl_slist_free_all(pragma_header);
1006 pragma_header = NULL;
1007
1008 curl_slist_free_all(no_pragma_header);
1009 no_pragma_header = NULL;
1010
1011 if (curl_http_proxy) {
1012 free((void *)curl_http_proxy);
1013 curl_http_proxy = NULL;
1014 }
1015
1016 if (proxy_auth.password) {
1017 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1018 free(proxy_auth.password);
1019 proxy_auth.password = NULL;
1020 }
1021
1022 free((void *)curl_proxyuserpwd);
1023 curl_proxyuserpwd = NULL;
1024
1025 free((void *)http_proxy_authmethod);
1026 http_proxy_authmethod = NULL;
1027
1028 if (cert_auth.password != NULL) {
1029 memset(cert_auth.password, 0, strlen(cert_auth.password));
1030 free(cert_auth.password);
1031 cert_auth.password = NULL;
1032 }
1033 ssl_cert_password_required = 0;
1034
1035 free(cached_accept_language);
1036 cached_accept_language = NULL;
1037 }
1038
1039 struct active_request_slot *get_active_slot(void)
1040 {
1041 struct active_request_slot *slot = active_queue_head;
1042 struct active_request_slot *newslot;
1043
1044 #ifdef USE_CURL_MULTI
1045 int num_transfers;
1046
1047 /* Wait for a slot to open up if the queue is full */
1048 while (active_requests >= max_requests) {
1049 curl_multi_perform(curlm, &num_transfers);
1050 if (num_transfers < active_requests)
1051 process_curl_messages();
1052 }
1053 #endif
1054
1055 while (slot != NULL && slot->in_use)
1056 slot = slot->next;
1057
1058 if (slot == NULL) {
1059 newslot = xmalloc(sizeof(*newslot));
1060 newslot->curl = NULL;
1061 newslot->in_use = 0;
1062 newslot->next = NULL;
1063
1064 slot = active_queue_head;
1065 if (slot == NULL) {
1066 active_queue_head = newslot;
1067 } else {
1068 while (slot->next != NULL)
1069 slot = slot->next;
1070 slot->next = newslot;
1071 }
1072 slot = newslot;
1073 }
1074
1075 if (slot->curl == NULL) {
1076 #ifdef NO_CURL_EASY_DUPHANDLE
1077 slot->curl = get_curl_handle();
1078 #else
1079 slot->curl = curl_easy_duphandle(curl_default);
1080 #endif
1081 curl_session_count++;
1082 }
1083
1084 active_requests++;
1085 slot->in_use = 1;
1086 slot->results = NULL;
1087 slot->finished = NULL;
1088 slot->callback_data = NULL;
1089 slot->callback_func = NULL;
1090 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1091 if (curl_save_cookies)
1092 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1093 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1094 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1095 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1096 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1097 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1098 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1099 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1100 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1101 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1102 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1103
1104 /*
1105 * Default following to off unless "ALWAYS" is configured; this gives
1106 * callers a sane starting point, and they can tweak for individual
1107 * HTTP_FOLLOW_* cases themselves.
1108 */
1109 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1110 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1111 else
1112 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1113
1114 #if LIBCURL_VERSION_NUM >= 0x070a08
1115 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1116 #endif
1117 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1118 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1119 #endif
1120 if (http_auth.password || curl_empty_auth_enabled())
1121 init_curl_http_auth(slot->curl);
1122
1123 return slot;
1124 }
1125
1126 int start_active_slot(struct active_request_slot *slot)
1127 {
1128 #ifdef USE_CURL_MULTI
1129 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1130 int num_transfers;
1131
1132 if (curlm_result != CURLM_OK &&
1133 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1134 warning("curl_multi_add_handle failed: %s",
1135 curl_multi_strerror(curlm_result));
1136 active_requests--;
1137 slot->in_use = 0;
1138 return 0;
1139 }
1140
1141 /*
1142 * We know there must be something to do, since we just added
1143 * something.
1144 */
1145 curl_multi_perform(curlm, &num_transfers);
1146 #endif
1147 return 1;
1148 }
1149
1150 #ifdef USE_CURL_MULTI
1151 struct fill_chain {
1152 void *data;
1153 int (*fill)(void *);
1154 struct fill_chain *next;
1155 };
1156
1157 static struct fill_chain *fill_cfg;
1158
1159 void add_fill_function(void *data, int (*fill)(void *))
1160 {
1161 struct fill_chain *new = xmalloc(sizeof(*new));
1162 struct fill_chain **linkp = &fill_cfg;
1163 new->data = data;
1164 new->fill = fill;
1165 new->next = NULL;
1166 while (*linkp)
1167 linkp = &(*linkp)->next;
1168 *linkp = new;
1169 }
1170
1171 void fill_active_slots(void)
1172 {
1173 struct active_request_slot *slot = active_queue_head;
1174
1175 while (active_requests < max_requests) {
1176 struct fill_chain *fill;
1177 for (fill = fill_cfg; fill; fill = fill->next)
1178 if (fill->fill(fill->data))
1179 break;
1180
1181 if (!fill)
1182 break;
1183 }
1184
1185 while (slot != NULL) {
1186 if (!slot->in_use && slot->curl != NULL
1187 && curl_session_count > min_curl_sessions) {
1188 curl_easy_cleanup(slot->curl);
1189 slot->curl = NULL;
1190 curl_session_count--;
1191 }
1192 slot = slot->next;
1193 }
1194 }
1195
1196 void step_active_slots(void)
1197 {
1198 int num_transfers;
1199 CURLMcode curlm_result;
1200
1201 do {
1202 curlm_result = curl_multi_perform(curlm, &num_transfers);
1203 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1204 if (num_transfers < active_requests) {
1205 process_curl_messages();
1206 fill_active_slots();
1207 }
1208 }
1209 #endif
1210
1211 void run_active_slot(struct active_request_slot *slot)
1212 {
1213 #ifdef USE_CURL_MULTI
1214 fd_set readfds;
1215 fd_set writefds;
1216 fd_set excfds;
1217 int max_fd;
1218 struct timeval select_timeout;
1219 int finished = 0;
1220
1221 slot->finished = &finished;
1222 while (!finished) {
1223 step_active_slots();
1224
1225 if (slot->in_use) {
1226 #if LIBCURL_VERSION_NUM >= 0x070f04
1227 long curl_timeout;
1228 curl_multi_timeout(curlm, &curl_timeout);
1229 if (curl_timeout == 0) {
1230 continue;
1231 } else if (curl_timeout == -1) {
1232 select_timeout.tv_sec = 0;
1233 select_timeout.tv_usec = 50000;
1234 } else {
1235 select_timeout.tv_sec = curl_timeout / 1000;
1236 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1237 }
1238 #else
1239 select_timeout.tv_sec = 0;
1240 select_timeout.tv_usec = 50000;
1241 #endif
1242
1243 max_fd = -1;
1244 FD_ZERO(&readfds);
1245 FD_ZERO(&writefds);
1246 FD_ZERO(&excfds);
1247 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1248
1249 /*
1250 * It can happen that curl_multi_timeout returns a pathologically
1251 * long timeout when curl_multi_fdset returns no file descriptors
1252 * to read. See commit message for more details.
1253 */
1254 if (max_fd < 0 &&
1255 (select_timeout.tv_sec > 0 ||
1256 select_timeout.tv_usec > 50000)) {
1257 select_timeout.tv_sec = 0;
1258 select_timeout.tv_usec = 50000;
1259 }
1260
1261 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1262 }
1263 }
1264 #else
1265 while (slot->in_use) {
1266 slot->curl_result = curl_easy_perform(slot->curl);
1267 finish_active_slot(slot);
1268 }
1269 #endif
1270 }
1271
1272 static void release_active_slot(struct active_request_slot *slot)
1273 {
1274 closedown_active_slot(slot);
1275 if (slot->curl) {
1276 xmulti_remove_handle(slot);
1277 if (curl_session_count > min_curl_sessions) {
1278 curl_easy_cleanup(slot->curl);
1279 slot->curl = NULL;
1280 curl_session_count--;
1281 }
1282 }
1283 #ifdef USE_CURL_MULTI
1284 fill_active_slots();
1285 #endif
1286 }
1287
1288 void finish_all_active_slots(void)
1289 {
1290 struct active_request_slot *slot = active_queue_head;
1291
1292 while (slot != NULL)
1293 if (slot->in_use) {
1294 run_active_slot(slot);
1295 slot = active_queue_head;
1296 } else {
1297 slot = slot->next;
1298 }
1299 }
1300
1301 /* Helpers for modifying and creating URLs */
1302 static inline int needs_quote(int ch)
1303 {
1304 if (((ch >= 'A') && (ch <= 'Z'))
1305 || ((ch >= 'a') && (ch <= 'z'))
1306 || ((ch >= '0') && (ch <= '9'))
1307 || (ch == '/')
1308 || (ch == '-')
1309 || (ch == '.'))
1310 return 0;
1311 return 1;
1312 }
1313
1314 static char *quote_ref_url(const char *base, const char *ref)
1315 {
1316 struct strbuf buf = STRBUF_INIT;
1317 const char *cp;
1318 int ch;
1319
1320 end_url_with_slash(&buf, base);
1321
1322 for (cp = ref; (ch = *cp) != 0; cp++)
1323 if (needs_quote(ch))
1324 strbuf_addf(&buf, "%%%02x", ch);
1325 else
1326 strbuf_addch(&buf, *cp);
1327
1328 return strbuf_detach(&buf, NULL);
1329 }
1330
1331 void append_remote_object_url(struct strbuf *buf, const char *url,
1332 const char *hex,
1333 int only_two_digit_prefix)
1334 {
1335 end_url_with_slash(buf, url);
1336
1337 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1338 if (!only_two_digit_prefix)
1339 strbuf_addstr(buf, hex + 2);
1340 }
1341
1342 char *get_remote_object_url(const char *url, const char *hex,
1343 int only_two_digit_prefix)
1344 {
1345 struct strbuf buf = STRBUF_INIT;
1346 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1347 return strbuf_detach(&buf, NULL);
1348 }
1349
1350 static int handle_curl_result(struct slot_results *results)
1351 {
1352 /*
1353 * If we see a failing http code with CURLE_OK, we have turned off
1354 * FAILONERROR (to keep the server's custom error response), and should
1355 * translate the code into failure here.
1356 *
1357 * Likewise, if we see a redirect (30x code), that means we turned off
1358 * redirect-following, and we should treat the result as an error.
1359 */
1360 if (results->curl_result == CURLE_OK &&
1361 results->http_code >= 300) {
1362 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1363 /*
1364 * Normally curl will already have put the "reason phrase"
1365 * from the server into curl_errorstr; unfortunately without
1366 * FAILONERROR it is lost, so we can give only the numeric
1367 * status code.
1368 */
1369 snprintf(curl_errorstr, sizeof(curl_errorstr),
1370 "The requested URL returned error: %ld",
1371 results->http_code);
1372 }
1373
1374 if (results->curl_result == CURLE_OK) {
1375 credential_approve(&http_auth);
1376 if (proxy_auth.password)
1377 credential_approve(&proxy_auth);
1378 return HTTP_OK;
1379 } else if (missing_target(results))
1380 return HTTP_MISSING_TARGET;
1381 else if (results->http_code == 401) {
1382 if (http_auth.username && http_auth.password) {
1383 credential_reject(&http_auth);
1384 return HTTP_NOAUTH;
1385 } else {
1386 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1387 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1388 if (results->auth_avail) {
1389 http_auth_methods &= results->auth_avail;
1390 http_auth_methods_restricted = 1;
1391 }
1392 #endif
1393 return HTTP_REAUTH;
1394 }
1395 } else {
1396 if (results->http_connectcode == 407)
1397 credential_reject(&proxy_auth);
1398 #if LIBCURL_VERSION_NUM >= 0x070c00
1399 if (!curl_errorstr[0])
1400 strlcpy(curl_errorstr,
1401 curl_easy_strerror(results->curl_result),
1402 sizeof(curl_errorstr));
1403 #endif
1404 return HTTP_ERROR;
1405 }
1406 }
1407
1408 int run_one_slot(struct active_request_slot *slot,
1409 struct slot_results *results)
1410 {
1411 slot->results = results;
1412 if (!start_active_slot(slot)) {
1413 snprintf(curl_errorstr, sizeof(curl_errorstr),
1414 "failed to start HTTP request");
1415 return HTTP_START_FAILED;
1416 }
1417
1418 run_active_slot(slot);
1419 return handle_curl_result(results);
1420 }
1421
1422 struct curl_slist *http_copy_default_headers(void)
1423 {
1424 struct curl_slist *headers = NULL, *h;
1425
1426 for (h = extra_http_headers; h; h = h->next)
1427 headers = curl_slist_append(headers, h->data);
1428
1429 return headers;
1430 }
1431
1432 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1433 {
1434 char *ptr;
1435 CURLcode ret;
1436
1437 strbuf_reset(buf);
1438 ret = curl_easy_getinfo(curl, info, &ptr);
1439 if (!ret && ptr)
1440 strbuf_addstr(buf, ptr);
1441 return ret;
1442 }
1443
1444 /*
1445 * Check for and extract a content-type parameter. "raw"
1446 * should be positioned at the start of the potential
1447 * parameter, with any whitespace already removed.
1448 *
1449 * "name" is the name of the parameter. The value is appended
1450 * to "out".
1451 */
1452 static int extract_param(const char *raw, const char *name,
1453 struct strbuf *out)
1454 {
1455 size_t len = strlen(name);
1456
1457 if (strncasecmp(raw, name, len))
1458 return -1;
1459 raw += len;
1460
1461 if (*raw != '=')
1462 return -1;
1463 raw++;
1464
1465 while (*raw && !isspace(*raw) && *raw != ';')
1466 strbuf_addch(out, *raw++);
1467 return 0;
1468 }
1469
1470 /*
1471 * Extract a normalized version of the content type, with any
1472 * spaces suppressed, all letters lowercased, and no trailing ";"
1473 * or parameters.
1474 *
1475 * Note that we will silently remove even invalid whitespace. For
1476 * example, "text / plain" is specifically forbidden by RFC 2616,
1477 * but "text/plain" is the only reasonable output, and this keeps
1478 * our code simple.
1479 *
1480 * If the "charset" argument is not NULL, store the value of any
1481 * charset parameter there.
1482 *
1483 * Example:
1484 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1485 * "text / plain" -> "text/plain"
1486 */
1487 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1488 struct strbuf *charset)
1489 {
1490 const char *p;
1491
1492 strbuf_reset(type);
1493 strbuf_grow(type, raw->len);
1494 for (p = raw->buf; *p; p++) {
1495 if (isspace(*p))
1496 continue;
1497 if (*p == ';') {
1498 p++;
1499 break;
1500 }
1501 strbuf_addch(type, tolower(*p));
1502 }
1503
1504 if (!charset)
1505 return;
1506
1507 strbuf_reset(charset);
1508 while (*p) {
1509 while (isspace(*p) || *p == ';')
1510 p++;
1511 if (!extract_param(p, "charset", charset))
1512 return;
1513 while (*p && !isspace(*p))
1514 p++;
1515 }
1516
1517 if (!charset->len && starts_with(type->buf, "text/"))
1518 strbuf_addstr(charset, "ISO-8859-1");
1519 }
1520
1521 static void write_accept_language(struct strbuf *buf)
1522 {
1523 /*
1524 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1525 * that, q-value will be smaller than 0.001, the minimum q-value the
1526 * HTTP specification allows. See
1527 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1528 */
1529 const int MAX_DECIMAL_PLACES = 3;
1530 const int MAX_LANGUAGE_TAGS = 1000;
1531 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1532 char **language_tags = NULL;
1533 int num_langs = 0;
1534 const char *s = get_preferred_languages();
1535 int i;
1536 struct strbuf tag = STRBUF_INIT;
1537
1538 /* Don't add Accept-Language header if no language is preferred. */
1539 if (!s)
1540 return;
1541
1542 /*
1543 * Split the colon-separated string of preferred languages into
1544 * language_tags array.
1545 */
1546 do {
1547 /* collect language tag */
1548 for (; *s && (isalnum(*s) || *s == '_'); s++)
1549 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1550
1551 /* skip .codeset, @modifier and any other unnecessary parts */
1552 while (*s && *s != ':')
1553 s++;
1554
1555 if (tag.len) {
1556 num_langs++;
1557 REALLOC_ARRAY(language_tags, num_langs);
1558 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1559 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1560 break;
1561 }
1562 } while (*s++);
1563
1564 /* write Accept-Language header into buf */
1565 if (num_langs) {
1566 int last_buf_len = 0;
1567 int max_q;
1568 int decimal_places;
1569 char q_format[32];
1570
1571 /* add '*' */
1572 REALLOC_ARRAY(language_tags, num_langs + 1);
1573 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1574
1575 /* compute decimal_places */
1576 for (max_q = 1, decimal_places = 0;
1577 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1578 decimal_places++, max_q *= 10)
1579 ;
1580
1581 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1582
1583 strbuf_addstr(buf, "Accept-Language: ");
1584
1585 for (i = 0; i < num_langs; i++) {
1586 if (i > 0)
1587 strbuf_addstr(buf, ", ");
1588
1589 strbuf_addstr(buf, language_tags[i]);
1590
1591 if (i > 0)
1592 strbuf_addf(buf, q_format, max_q - i);
1593
1594 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1595 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1596 break;
1597 }
1598
1599 last_buf_len = buf->len;
1600 }
1601 }
1602
1603 /* free language tags -- last one is a static '*' */
1604 for (i = 0; i < num_langs - 1; i++)
1605 free(language_tags[i]);
1606 free(language_tags);
1607 }
1608
1609 /*
1610 * Get an Accept-Language header which indicates user's preferred languages.
1611 *
1612 * Examples:
1613 * LANGUAGE= -> ""
1614 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1615 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1616 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1617 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1618 * LANGUAGE= LANG=C -> ""
1619 */
1620 static const char *get_accept_language(void)
1621 {
1622 if (!cached_accept_language) {
1623 struct strbuf buf = STRBUF_INIT;
1624 write_accept_language(&buf);
1625 if (buf.len > 0)
1626 cached_accept_language = strbuf_detach(&buf, NULL);
1627 }
1628
1629 return cached_accept_language;
1630 }
1631
1632 static void http_opt_request_remainder(CURL *curl, off_t pos)
1633 {
1634 char buf[128];
1635 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1636 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1637 }
1638
1639 /* http_request() targets */
1640 #define HTTP_REQUEST_STRBUF 0
1641 #define HTTP_REQUEST_FILE 1
1642
1643 static int http_request(const char *url,
1644 void *result, int target,
1645 const struct http_get_options *options)
1646 {
1647 struct active_request_slot *slot;
1648 struct slot_results results;
1649 struct curl_slist *headers = http_copy_default_headers();
1650 struct strbuf buf = STRBUF_INIT;
1651 const char *accept_language;
1652 int ret;
1653
1654 slot = get_active_slot();
1655 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1656
1657 if (result == NULL) {
1658 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1659 } else {
1660 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1661 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1662
1663 if (target == HTTP_REQUEST_FILE) {
1664 off_t posn = ftello(result);
1665 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1666 fwrite);
1667 if (posn > 0)
1668 http_opt_request_remainder(slot->curl, posn);
1669 } else
1670 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1671 fwrite_buffer);
1672 }
1673
1674 accept_language = get_accept_language();
1675
1676 if (accept_language)
1677 headers = curl_slist_append(headers, accept_language);
1678
1679 strbuf_addstr(&buf, "Pragma:");
1680 if (options && options->no_cache)
1681 strbuf_addstr(&buf, " no-cache");
1682 if (options && options->keep_error)
1683 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1684 if (options && options->initial_request &&
1685 http_follow_config == HTTP_FOLLOW_INITIAL)
1686 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1687
1688 headers = curl_slist_append(headers, buf.buf);
1689
1690 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1691 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1692 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1693
1694 ret = run_one_slot(slot, &results);
1695
1696 if (options && options->content_type) {
1697 struct strbuf raw = STRBUF_INIT;
1698 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1699 extract_content_type(&raw, options->content_type,
1700 options->charset);
1701 strbuf_release(&raw);
1702 }
1703
1704 if (options && options->effective_url)
1705 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1706 options->effective_url);
1707
1708 curl_slist_free_all(headers);
1709 strbuf_release(&buf);
1710
1711 return ret;
1712 }
1713
1714 /*
1715 * Update the "base" url to a more appropriate value, as deduced by
1716 * redirects seen when requesting a URL starting with "url".
1717 *
1718 * The "asked" parameter is a URL that we asked curl to access, and must begin
1719 * with "base".
1720 *
1721 * The "got" parameter is the URL that curl reported to us as where we ended
1722 * up.
1723 *
1724 * Returns 1 if we updated the base url, 0 otherwise.
1725 *
1726 * Our basic strategy is to compare "base" and "asked" to find the bits
1727 * specific to our request. We then strip those bits off of "got" to yield the
1728 * new base. So for example, if our base is "http://example.com/foo.git",
1729 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1730 * with "https://other.example.com/foo.git/info/refs". We would want the
1731 * new URL to become "https://other.example.com/foo.git".
1732 *
1733 * Note that this assumes a sane redirect scheme. It's entirely possible
1734 * in the example above to end up at a URL that does not even end in
1735 * "info/refs". In such a case we die. There's not much we can do, such a
1736 * scheme is unlikely to represent a real git repository, and failing to
1737 * rewrite the base opens options for malicious redirects to do funny things.
1738 */
1739 static int update_url_from_redirect(struct strbuf *base,
1740 const char *asked,
1741 const struct strbuf *got)
1742 {
1743 const char *tail;
1744 size_t new_len;
1745
1746 if (!strcmp(asked, got->buf))
1747 return 0;
1748
1749 if (!skip_prefix(asked, base->buf, &tail))
1750 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1751 asked, base->buf);
1752
1753 new_len = got->len;
1754 if (!strip_suffix_mem(got->buf, &new_len, tail))
1755 die(_("unable to update url base from redirection:\n"
1756 " asked for: %s\n"
1757 " redirect: %s"),
1758 asked, got->buf);
1759
1760 strbuf_reset(base);
1761 strbuf_add(base, got->buf, new_len);
1762
1763 return 1;
1764 }
1765
1766 static int http_request_reauth(const char *url,
1767 void *result, int target,
1768 struct http_get_options *options)
1769 {
1770 int ret = http_request(url, result, target, options);
1771
1772 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1773 return ret;
1774
1775 if (options && options->effective_url && options->base_url) {
1776 if (update_url_from_redirect(options->base_url,
1777 url, options->effective_url)) {
1778 credential_from_url(&http_auth, options->base_url->buf);
1779 url = options->effective_url->buf;
1780 }
1781 }
1782
1783 if (ret != HTTP_REAUTH)
1784 return ret;
1785
1786 /*
1787 * If we are using KEEP_ERROR, the previous request may have
1788 * put cruft into our output stream; we should clear it out before
1789 * making our next request. We only know how to do this for
1790 * the strbuf case, but that is enough to satisfy current callers.
1791 */
1792 if (options && options->keep_error) {
1793 switch (target) {
1794 case HTTP_REQUEST_STRBUF:
1795 strbuf_reset(result);
1796 break;
1797 default:
1798 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1799 }
1800 }
1801
1802 credential_fill(&http_auth);
1803
1804 return http_request(url, result, target, options);
1805 }
1806
1807 int http_get_strbuf(const char *url,
1808 struct strbuf *result,
1809 struct http_get_options *options)
1810 {
1811 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1812 }
1813
1814 /*
1815 * Downloads a URL and stores the result in the given file.
1816 *
1817 * If a previous interrupted download is detected (i.e. a previous temporary
1818 * file is still around) the download is resumed.
1819 */
1820 static int http_get_file(const char *url, const char *filename,
1821 struct http_get_options *options)
1822 {
1823 int ret;
1824 struct strbuf tmpfile = STRBUF_INIT;
1825 FILE *result;
1826
1827 strbuf_addf(&tmpfile, "%s.temp", filename);
1828 result = fopen(tmpfile.buf, "a");
1829 if (!result) {
1830 error("Unable to open local file %s", tmpfile.buf);
1831 ret = HTTP_ERROR;
1832 goto cleanup;
1833 }
1834
1835 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1836 fclose(result);
1837
1838 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1839 ret = HTTP_ERROR;
1840 cleanup:
1841 strbuf_release(&tmpfile);
1842 return ret;
1843 }
1844
1845 int http_fetch_ref(const char *base, struct ref *ref)
1846 {
1847 struct http_get_options options = {0};
1848 char *url;
1849 struct strbuf buffer = STRBUF_INIT;
1850 int ret = -1;
1851
1852 options.no_cache = 1;
1853
1854 url = quote_ref_url(base, ref->name);
1855 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1856 strbuf_rtrim(&buffer);
1857 if (buffer.len == 40)
1858 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1859 else if (starts_with(buffer.buf, "ref: ")) {
1860 ref->symref = xstrdup(buffer.buf + 5);
1861 ret = 0;
1862 }
1863 }
1864
1865 strbuf_release(&buffer);
1866 free(url);
1867 return ret;
1868 }
1869
1870 /* Helpers for fetching packs */
1871 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1872 {
1873 char *url, *tmp;
1874 struct strbuf buf = STRBUF_INIT;
1875
1876 if (http_is_verbose)
1877 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1878
1879 end_url_with_slash(&buf, base_url);
1880 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1881 url = strbuf_detach(&buf, NULL);
1882
1883 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1884 tmp = strbuf_detach(&buf, NULL);
1885
1886 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1887 error("Unable to get pack index %s", url);
1888 free(tmp);
1889 tmp = NULL;
1890 }
1891
1892 free(url);
1893 return tmp;
1894 }
1895
1896 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1897 unsigned char *sha1, const char *base_url)
1898 {
1899 struct packed_git *new_pack;
1900 char *tmp_idx = NULL;
1901 int ret;
1902
1903 if (has_pack_index(sha1)) {
1904 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1905 if (!new_pack)
1906 return -1; /* parse_pack_index() already issued error message */
1907 goto add_pack;
1908 }
1909
1910 tmp_idx = fetch_pack_index(sha1, base_url);
1911 if (!tmp_idx)
1912 return -1;
1913
1914 new_pack = parse_pack_index(sha1, tmp_idx);
1915 if (!new_pack) {
1916 unlink(tmp_idx);
1917 free(tmp_idx);
1918
1919 return -1; /* parse_pack_index() already issued error message */
1920 }
1921
1922 ret = verify_pack_index(new_pack);
1923 if (!ret) {
1924 close_pack_index(new_pack);
1925 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1926 }
1927 free(tmp_idx);
1928 if (ret)
1929 return -1;
1930
1931 add_pack:
1932 new_pack->next = *packs_head;
1933 *packs_head = new_pack;
1934 return 0;
1935 }
1936
1937 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1938 {
1939 struct http_get_options options = {0};
1940 int ret = 0, i = 0;
1941 char *url, *data;
1942 struct strbuf buf = STRBUF_INIT;
1943 unsigned char sha1[20];
1944
1945 end_url_with_slash(&buf, base_url);
1946 strbuf_addstr(&buf, "objects/info/packs");
1947 url = strbuf_detach(&buf, NULL);
1948
1949 options.no_cache = 1;
1950 ret = http_get_strbuf(url, &buf, &options);
1951 if (ret != HTTP_OK)
1952 goto cleanup;
1953
1954 data = buf.buf;
1955 while (i < buf.len) {
1956 switch (data[i]) {
1957 case 'P':
1958 i++;
1959 if (i + 52 <= buf.len &&
1960 starts_with(data + i, " pack-") &&
1961 starts_with(data + i + 46, ".pack\n")) {
1962 get_sha1_hex(data + i + 6, sha1);
1963 fetch_and_setup_pack_index(packs_head, sha1,
1964 base_url);
1965 i += 51;
1966 break;
1967 }
1968 default:
1969 while (i < buf.len && data[i] != '\n')
1970 i++;
1971 }
1972 i++;
1973 }
1974
1975 cleanup:
1976 free(url);
1977 return ret;
1978 }
1979
1980 void release_http_pack_request(struct http_pack_request *preq)
1981 {
1982 if (preq->packfile != NULL) {
1983 fclose(preq->packfile);
1984 preq->packfile = NULL;
1985 }
1986 preq->slot = NULL;
1987 free(preq->url);
1988 free(preq);
1989 }
1990
1991 int finish_http_pack_request(struct http_pack_request *preq)
1992 {
1993 struct packed_git **lst;
1994 struct packed_git *p = preq->target;
1995 char *tmp_idx;
1996 size_t len;
1997 struct child_process ip = CHILD_PROCESS_INIT;
1998 const char *ip_argv[8];
1999
2000 close_pack_index(p);
2001
2002 fclose(preq->packfile);
2003 preq->packfile = NULL;
2004
2005 lst = preq->lst;
2006 while (*lst != p)
2007 lst = &((*lst)->next);
2008 *lst = (*lst)->next;
2009
2010 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2011 die("BUG: pack tmpfile does not end in .pack.temp?");
2012 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2013
2014 ip_argv[0] = "index-pack";
2015 ip_argv[1] = "-o";
2016 ip_argv[2] = tmp_idx;
2017 ip_argv[3] = preq->tmpfile;
2018 ip_argv[4] = NULL;
2019
2020 ip.argv = ip_argv;
2021 ip.git_cmd = 1;
2022 ip.no_stdin = 1;
2023 ip.no_stdout = 1;
2024
2025 if (run_command(&ip)) {
2026 unlink(preq->tmpfile);
2027 unlink(tmp_idx);
2028 free(tmp_idx);
2029 return -1;
2030 }
2031
2032 unlink(sha1_pack_index_name(p->sha1));
2033
2034 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2035 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2036 free(tmp_idx);
2037 return -1;
2038 }
2039
2040 install_packed_git(p);
2041 free(tmp_idx);
2042 return 0;
2043 }
2044
2045 struct http_pack_request *new_http_pack_request(
2046 struct packed_git *target, const char *base_url)
2047 {
2048 off_t prev_posn = 0;
2049 struct strbuf buf = STRBUF_INIT;
2050 struct http_pack_request *preq;
2051
2052 preq = xcalloc(1, sizeof(*preq));
2053 preq->target = target;
2054
2055 end_url_with_slash(&buf, base_url);
2056 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2057 sha1_to_hex(target->sha1));
2058 preq->url = strbuf_detach(&buf, NULL);
2059
2060 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2061 sha1_pack_name(target->sha1));
2062 preq->packfile = fopen(preq->tmpfile, "a");
2063 if (!preq->packfile) {
2064 error("Unable to open local file %s for pack",
2065 preq->tmpfile);
2066 goto abort;
2067 }
2068
2069 preq->slot = get_active_slot();
2070 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2071 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2072 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2073 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2074 no_pragma_header);
2075
2076 /*
2077 * If there is data present from a previous transfer attempt,
2078 * resume where it left off
2079 */
2080 prev_posn = ftello(preq->packfile);
2081 if (prev_posn>0) {
2082 if (http_is_verbose)
2083 fprintf(stderr,
2084 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2085 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2086 http_opt_request_remainder(preq->slot->curl, prev_posn);
2087 }
2088
2089 return preq;
2090
2091 abort:
2092 free(preq->url);
2093 free(preq);
2094 return NULL;
2095 }
2096
2097 /* Helpers for fetching objects (loose) */
2098 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2099 void *data)
2100 {
2101 unsigned char expn[4096];
2102 size_t size = eltsize * nmemb;
2103 int posn = 0;
2104 struct http_object_request *freq = data;
2105 struct active_request_slot *slot = freq->slot;
2106
2107 if (slot) {
2108 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2109 &slot->http_code);
2110 if (c != CURLE_OK)
2111 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2112 curl_easy_strerror(c));
2113 if (slot->http_code >= 300)
2114 return size;
2115 }
2116
2117 do {
2118 ssize_t retval = xwrite(freq->localfile,
2119 (char *) ptr + posn, size - posn);
2120 if (retval < 0)
2121 return posn;
2122 posn += retval;
2123 } while (posn < size);
2124
2125 freq->stream.avail_in = size;
2126 freq->stream.next_in = (void *)ptr;
2127 do {
2128 freq->stream.next_out = expn;
2129 freq->stream.avail_out = sizeof(expn);
2130 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2131 git_SHA1_Update(&freq->c, expn,
2132 sizeof(expn) - freq->stream.avail_out);
2133 } while (freq->stream.avail_in && freq->zret == Z_OK);
2134 return size;
2135 }
2136
2137 struct http_object_request *new_http_object_request(const char *base_url,
2138 unsigned char *sha1)
2139 {
2140 char *hex = sha1_to_hex(sha1);
2141 const char *filename;
2142 char prevfile[PATH_MAX];
2143 int prevlocal;
2144 char prev_buf[PREV_BUF_SIZE];
2145 ssize_t prev_read = 0;
2146 off_t prev_posn = 0;
2147 struct http_object_request *freq;
2148
2149 freq = xcalloc(1, sizeof(*freq));
2150 hashcpy(freq->sha1, sha1);
2151 freq->localfile = -1;
2152
2153 filename = sha1_file_name(sha1);
2154 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2155 "%s.temp", filename);
2156
2157 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2158 unlink_or_warn(prevfile);
2159 rename(freq->tmpfile, prevfile);
2160 unlink_or_warn(freq->tmpfile);
2161
2162 if (freq->localfile != -1)
2163 error("fd leakage in start: %d", freq->localfile);
2164 freq->localfile = open(freq->tmpfile,
2165 O_WRONLY | O_CREAT | O_EXCL, 0666);
2166 /*
2167 * This could have failed due to the "lazy directory creation";
2168 * try to mkdir the last path component.
2169 */
2170 if (freq->localfile < 0 && errno == ENOENT) {
2171 char *dir = strrchr(freq->tmpfile, '/');
2172 if (dir) {
2173 *dir = 0;
2174 mkdir(freq->tmpfile, 0777);
2175 *dir = '/';
2176 }
2177 freq->localfile = open(freq->tmpfile,
2178 O_WRONLY | O_CREAT | O_EXCL, 0666);
2179 }
2180
2181 if (freq->localfile < 0) {
2182 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2183 goto abort;
2184 }
2185
2186 git_inflate_init(&freq->stream);
2187
2188 git_SHA1_Init(&freq->c);
2189
2190 freq->url = get_remote_object_url(base_url, hex, 0);
2191
2192 /*
2193 * If a previous temp file is present, process what was already
2194 * fetched.
2195 */
2196 prevlocal = open(prevfile, O_RDONLY);
2197 if (prevlocal != -1) {
2198 do {
2199 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2200 if (prev_read>0) {
2201 if (fwrite_sha1_file(prev_buf,
2202 1,
2203 prev_read,
2204 freq) == prev_read) {
2205 prev_posn += prev_read;
2206 } else {
2207 prev_read = -1;
2208 }
2209 }
2210 } while (prev_read > 0);
2211 close(prevlocal);
2212 }
2213 unlink_or_warn(prevfile);
2214
2215 /*
2216 * Reset inflate/SHA1 if there was an error reading the previous temp
2217 * file; also rewind to the beginning of the local file.
2218 */
2219 if (prev_read == -1) {
2220 memset(&freq->stream, 0, sizeof(freq->stream));
2221 git_inflate_init(&freq->stream);
2222 git_SHA1_Init(&freq->c);
2223 if (prev_posn>0) {
2224 prev_posn = 0;
2225 lseek(freq->localfile, 0, SEEK_SET);
2226 if (ftruncate(freq->localfile, 0) < 0) {
2227 error_errno("Couldn't truncate temporary file %s",
2228 freq->tmpfile);
2229 goto abort;
2230 }
2231 }
2232 }
2233
2234 freq->slot = get_active_slot();
2235
2236 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2237 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2238 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2239 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2240 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2241 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2242
2243 /*
2244 * If we have successfully processed data from a previous fetch
2245 * attempt, only fetch the data we don't already have.
2246 */
2247 if (prev_posn>0) {
2248 if (http_is_verbose)
2249 fprintf(stderr,
2250 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2251 hex, (uintmax_t)prev_posn);
2252 http_opt_request_remainder(freq->slot->curl, prev_posn);
2253 }
2254
2255 return freq;
2256
2257 abort:
2258 free(freq->url);
2259 free(freq);
2260 return NULL;
2261 }
2262
2263 void process_http_object_request(struct http_object_request *freq)
2264 {
2265 if (freq->slot == NULL)
2266 return;
2267 freq->curl_result = freq->slot->curl_result;
2268 freq->http_code = freq->slot->http_code;
2269 freq->slot = NULL;
2270 }
2271
2272 int finish_http_object_request(struct http_object_request *freq)
2273 {
2274 struct stat st;
2275
2276 close(freq->localfile);
2277 freq->localfile = -1;
2278
2279 process_http_object_request(freq);
2280
2281 if (freq->http_code == 416) {
2282 warning("requested range invalid; we may already have all the data.");
2283 } else if (freq->curl_result != CURLE_OK) {
2284 if (stat(freq->tmpfile, &st) == 0)
2285 if (st.st_size == 0)
2286 unlink_or_warn(freq->tmpfile);
2287 return -1;
2288 }
2289
2290 git_inflate_end(&freq->stream);
2291 git_SHA1_Final(freq->real_sha1, &freq->c);
2292 if (freq->zret != Z_STREAM_END) {
2293 unlink_or_warn(freq->tmpfile);
2294 return -1;
2295 }
2296 if (hashcmp(freq->sha1, freq->real_sha1)) {
2297 unlink_or_warn(freq->tmpfile);
2298 return -1;
2299 }
2300 freq->rename =
2301 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2302
2303 return freq->rename;
2304 }
2305
2306 void abort_http_object_request(struct http_object_request *freq)
2307 {
2308 unlink_or_warn(freq->tmpfile);
2309
2310 release_http_object_request(freq);
2311 }
2312
2313 void release_http_object_request(struct http_object_request *freq)
2314 {
2315 if (freq->localfile != -1) {
2316 close(freq->localfile);
2317 freq->localfile = -1;
2318 }
2319 if (freq->url != NULL) {
2320 free(freq->url);
2321 freq->url = NULL;
2322 }
2323 if (freq->slot != NULL) {
2324 freq->slot->callback_func = NULL;
2325 freq->slot->callback_data = NULL;
2326 release_active_slot(freq->slot);
2327 freq->slot = NULL;
2328 }
2329 }
git for Debian