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http-walker: fix buffer underflow processing remote alternates
[git/raj.git] / http.c
blob90a1c0f1131c4a5fcbc50d6cc81c1be9cef3cd71
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "pack.h"
4 #include "sideband.h"
5 #include "run-command.h"
6 #include "url.h"
7 #include "urlmatch.h"
8 #include "credential.h"
9 #include "version.h"
10 #include "pkt-line.h"
11 #include "gettext.h"
12 #include "transport.h"
13
14 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
15 #if LIBCURL_VERSION_NUM >= 0x070a08
16 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
17 #else
18 long int git_curl_ipresolve;
19 #endif
20 int active_requests;
21 int http_is_verbose;
22 size_t http_post_buffer = 16 * LARGE_PACKET_MAX;
23
24 #if LIBCURL_VERSION_NUM >= 0x070a06
25 #define LIBCURL_CAN_HANDLE_AUTH_ANY
26 #endif
27
28 static int min_curl_sessions = 1;
29 static int curl_session_count;
30 #ifdef USE_CURL_MULTI
31 static int max_requests = -1;
32 static CURLM *curlm;
33 #endif
34 #ifndef NO_CURL_EASY_DUPHANDLE
35 static CURL *curl_default;
36 #endif
37
38 #define PREV_BUF_SIZE 4096
39
40 char curl_errorstr[CURL_ERROR_SIZE];
41
42 static int curl_ssl_verify = -1;
43 static int curl_ssl_try;
44 static const char *ssl_cert;
45 static const char *ssl_cipherlist;
46 static const char *ssl_version;
47 static struct {
48 const char *name;
49 long ssl_version;
50 } sslversions[] = {
51 { "sslv2", CURL_SSLVERSION_SSLv2 },
52 { "sslv3", CURL_SSLVERSION_SSLv3 },
53 { "tlsv1", CURL_SSLVERSION_TLSv1 },
54 #if LIBCURL_VERSION_NUM >= 0x072200
55 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
56 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
57 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
58 #endif
59 };
60 #if LIBCURL_VERSION_NUM >= 0x070903
61 static const char *ssl_key;
62 #endif
63 #if LIBCURL_VERSION_NUM >= 0x070908
64 static const char *ssl_capath;
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x072c00
67 static const char *ssl_pinnedkey;
68 #endif
69 static const char *ssl_cainfo;
70 static long curl_low_speed_limit = -1;
71 static long curl_low_speed_time = -1;
72 static int curl_ftp_no_epsv;
73 static const char *curl_http_proxy;
74 static const char *curl_no_proxy;
75 static const char *http_proxy_authmethod;
76 static struct {
77 const char *name;
78 long curlauth_param;
79 } proxy_authmethods[] = {
80 { "basic", CURLAUTH_BASIC },
81 { "digest", CURLAUTH_DIGEST },
82 { "negotiate", CURLAUTH_GSSNEGOTIATE },
83 { "ntlm", CURLAUTH_NTLM },
84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
85 { "anyauth", CURLAUTH_ANY },
86 #endif
87 /*
88 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
89 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
90 * here, too
91 */
92 };
93 #if LIBCURL_VERSION_NUM >= 0x071600
94 static const char *curl_deleg;
95 static struct {
96 const char *name;
97 long curl_deleg_param;
98 } curl_deleg_levels[] = {
99 { "none", CURLGSSAPI_DELEGATION_NONE },
100 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
101 { "always", CURLGSSAPI_DELEGATION_FLAG },
102 };
103 #endif
104
105 static struct credential proxy_auth = CREDENTIAL_INIT;
106 static const char *curl_proxyuserpwd;
107 static const char *curl_cookie_file;
108 static int curl_save_cookies;
109 struct credential http_auth = CREDENTIAL_INIT;
110 static int http_proactive_auth;
111 static const char *user_agent;
112 static int curl_empty_auth;
113
114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
115
116 #if LIBCURL_VERSION_NUM >= 0x071700
117 /* Use CURLOPT_KEYPASSWD as is */
118 #elif LIBCURL_VERSION_NUM >= 0x070903
119 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
120 #else
121 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
122 #endif
123
124 static struct credential cert_auth = CREDENTIAL_INIT;
125 static int ssl_cert_password_required;
126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
127 static unsigned long http_auth_methods = CURLAUTH_ANY;
128 #endif
129
130 static struct curl_slist *pragma_header;
131 static struct curl_slist *no_pragma_header;
132 static struct curl_slist *extra_http_headers;
133
134 static struct active_request_slot *active_queue_head;
135
136 static char *cached_accept_language;
137
138 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
139 {
140 size_t size = eltsize * nmemb;
141 struct buffer *buffer = buffer_;
142
143 if (size > buffer->buf.len - buffer->posn)
144 size = buffer->buf.len - buffer->posn;
145 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
146 buffer->posn += size;
147
148 return size;
149 }
150
151 #ifndef NO_CURL_IOCTL
152 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
153 {
154 struct buffer *buffer = clientp;
155
156 switch (cmd) {
157 case CURLIOCMD_NOP:
158 return CURLIOE_OK;
159
160 case CURLIOCMD_RESTARTREAD:
161 buffer->posn = 0;
162 return CURLIOE_OK;
163
164 default:
165 return CURLIOE_UNKNOWNCMD;
166 }
167 }
168 #endif
169
170 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
171 {
172 size_t size = eltsize * nmemb;
173 struct strbuf *buffer = buffer_;
174
175 strbuf_add(buffer, ptr, size);
176 return size;
177 }
178
179 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
180 {
181 return eltsize * nmemb;
182 }
183
184 static void closedown_active_slot(struct active_request_slot *slot)
185 {
186 active_requests--;
187 slot->in_use = 0;
188 }
189
190 static void finish_active_slot(struct active_request_slot *slot)
191 {
192 closedown_active_slot(slot);
193 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
194
195 if (slot->finished != NULL)
196 (*slot->finished) = 1;
197
198 /* Store slot results so they can be read after the slot is reused */
199 if (slot->results != NULL) {
200 slot->results->curl_result = slot->curl_result;
201 slot->results->http_code = slot->http_code;
202 #if LIBCURL_VERSION_NUM >= 0x070a08
203 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
204 &slot->results->auth_avail);
205 #else
206 slot->results->auth_avail = 0;
207 #endif
208
209 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
210 &slot->results->http_connectcode);
211 }
212
213 /* Run callback if appropriate */
214 if (slot->callback_func != NULL)
215 slot->callback_func(slot->callback_data);
216 }
217
218 static void xmulti_remove_handle(struct active_request_slot *slot)
219 {
220 #ifdef USE_CURL_MULTI
221 curl_multi_remove_handle(curlm, slot->curl);
222 #endif
223 }
224
225 #ifdef USE_CURL_MULTI
226 static void process_curl_messages(void)
227 {
228 int num_messages;
229 struct active_request_slot *slot;
230 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
231
232 while (curl_message != NULL) {
233 if (curl_message->msg == CURLMSG_DONE) {
234 int curl_result = curl_message->data.result;
235 slot = active_queue_head;
236 while (slot != NULL &&
237 slot->curl != curl_message->easy_handle)
238 slot = slot->next;
239 if (slot != NULL) {
240 xmulti_remove_handle(slot);
241 slot->curl_result = curl_result;
242 finish_active_slot(slot);
243 } else {
244 fprintf(stderr, "Received DONE message for unknown request!\n");
245 }
246 } else {
247 fprintf(stderr, "Unknown CURL message received: %d\n",
248 (int)curl_message->msg);
249 }
250 curl_message = curl_multi_info_read(curlm, &num_messages);
251 }
252 }
253 #endif
254
255 static int http_options(const char *var, const char *value, void *cb)
256 {
257 if (!strcmp("http.sslverify", var)) {
258 curl_ssl_verify = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp("http.sslcipherlist", var))
262 return git_config_string(&ssl_cipherlist, var, value);
263 if (!strcmp("http.sslversion", var))
264 return git_config_string(&ssl_version, var, value);
265 if (!strcmp("http.sslcert", var))
266 return git_config_string(&ssl_cert, var, value);
267 #if LIBCURL_VERSION_NUM >= 0x070903
268 if (!strcmp("http.sslkey", var))
269 return git_config_string(&ssl_key, var, value);
270 #endif
271 #if LIBCURL_VERSION_NUM >= 0x070908
272 if (!strcmp("http.sslcapath", var))
273 return git_config_pathname(&ssl_capath, var, value);
274 #endif
275 if (!strcmp("http.sslcainfo", var))
276 return git_config_pathname(&ssl_cainfo, var, value);
277 if (!strcmp("http.sslcertpasswordprotected", var)) {
278 ssl_cert_password_required = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp("http.ssltry", var)) {
282 curl_ssl_try = git_config_bool(var, value);
283 return 0;
284 }
285 if (!strcmp("http.minsessions", var)) {
286 min_curl_sessions = git_config_int(var, value);
287 #ifndef USE_CURL_MULTI
288 if (min_curl_sessions > 1)
289 min_curl_sessions = 1;
290 #endif
291 return 0;
292 }
293 #ifdef USE_CURL_MULTI
294 if (!strcmp("http.maxrequests", var)) {
295 max_requests = git_config_int(var, value);
296 return 0;
297 }
298 #endif
299 if (!strcmp("http.lowspeedlimit", var)) {
300 curl_low_speed_limit = (long)git_config_int(var, value);
301 return 0;
302 }
303 if (!strcmp("http.lowspeedtime", var)) {
304 curl_low_speed_time = (long)git_config_int(var, value);
305 return 0;
306 }
307
308 if (!strcmp("http.noepsv", var)) {
309 curl_ftp_no_epsv = git_config_bool(var, value);
310 return 0;
311 }
312 if (!strcmp("http.proxy", var))
313 return git_config_string(&curl_http_proxy, var, value);
314
315 if (!strcmp("http.proxyauthmethod", var))
316 return git_config_string(&http_proxy_authmethod, var, value);
317
318 if (!strcmp("http.cookiefile", var))
319 return git_config_pathname(&curl_cookie_file, var, value);
320 if (!strcmp("http.savecookies", var)) {
321 curl_save_cookies = git_config_bool(var, value);
322 return 0;
323 }
324
325 if (!strcmp("http.postbuffer", var)) {
326 http_post_buffer = git_config_int(var, value);
327 if (http_post_buffer < LARGE_PACKET_MAX)
328 http_post_buffer = LARGE_PACKET_MAX;
329 return 0;
330 }
331
332 if (!strcmp("http.useragent", var))
333 return git_config_string(&user_agent, var, value);
334
335 if (!strcmp("http.emptyauth", var)) {
336 curl_empty_auth = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp("http.delegation", var)) {
341 #if LIBCURL_VERSION_NUM >= 0x071600
342 return git_config_string(&curl_deleg, var, value);
343 #else
344 warning(_("Delegation control is not supported with cURL < 7.22.0"));
345 return 0;
346 #endif
347 }
348
349 if (!strcmp("http.pinnedpubkey", var)) {
350 #if LIBCURL_VERSION_NUM >= 0x072c00
351 return git_config_pathname(&ssl_pinnedkey, var, value);
352 #else
353 warning(_("Public key pinning not supported with cURL < 7.44.0"));
354 return 0;
355 #endif
356 }
357
358 if (!strcmp("http.extraheader", var)) {
359 if (!value) {
360 return config_error_nonbool(var);
361 } else if (!*value) {
362 curl_slist_free_all(extra_http_headers);
363 extra_http_headers = NULL;
364 } else {
365 extra_http_headers =
366 curl_slist_append(extra_http_headers, value);
367 }
368 return 0;
369 }
370
371 if (!strcmp("http.followredirects", var)) {
372 if (value && !strcmp(value, "initial"))
373 http_follow_config = HTTP_FOLLOW_INITIAL;
374 else if (git_config_bool(var, value))
375 http_follow_config = HTTP_FOLLOW_ALWAYS;
376 else
377 http_follow_config = HTTP_FOLLOW_NONE;
378 return 0;
379 }
380
381 /* Fall back on the default ones */
382 return git_default_config(var, value, cb);
383 }
384
385 static void init_curl_http_auth(CURL *result)
386 {
387 if (!http_auth.username || !*http_auth.username) {
388 if (curl_empty_auth)
389 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
390 return;
391 }
392
393 credential_fill(&http_auth);
394
395 #if LIBCURL_VERSION_NUM >= 0x071301
396 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
397 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
398 #else
399 {
400 static struct strbuf up = STRBUF_INIT;
401 /*
402 * Note that we assume we only ever have a single set of
403 * credentials in a given program run, so we do not have
404 * to worry about updating this buffer, only setting its
405 * initial value.
406 */
407 if (!up.len)
408 strbuf_addf(&up, "%s:%s",
409 http_auth.username, http_auth.password);
410 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
411 }
412 #endif
413 }
414
415 /* *var must be free-able */
416 static void var_override(const char **var, char *value)
417 {
418 if (value) {
419 free((void *)*var);
420 *var = xstrdup(value);
421 }
422 }
423
424 static void set_proxyauth_name_password(CURL *result)
425 {
426 #if LIBCURL_VERSION_NUM >= 0x071301
427 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
428 proxy_auth.username);
429 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
430 proxy_auth.password);
431 #else
432 struct strbuf s = STRBUF_INIT;
433
434 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
435 strbuf_addch(&s, ':');
436 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
437 curl_proxyuserpwd = strbuf_detach(&s, NULL);
438 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
439 #endif
440 }
441
442 static void init_curl_proxy_auth(CURL *result)
443 {
444 if (proxy_auth.username) {
445 if (!proxy_auth.password)
446 credential_fill(&proxy_auth);
447 set_proxyauth_name_password(result);
448 }
449
450 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
451
452 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
453 if (http_proxy_authmethod) {
454 int i;
455 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
456 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
457 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
458 proxy_authmethods[i].curlauth_param);
459 break;
460 }
461 }
462 if (i == ARRAY_SIZE(proxy_authmethods)) {
463 warning("unsupported proxy authentication method %s: using anyauth",
464 http_proxy_authmethod);
465 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
466 }
467 }
468 else
469 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
470 #endif
471 }
472
473 static int has_cert_password(void)
474 {
475 if (ssl_cert == NULL || ssl_cert_password_required != 1)
476 return 0;
477 if (!cert_auth.password) {
478 cert_auth.protocol = xstrdup("cert");
479 cert_auth.username = xstrdup("");
480 cert_auth.path = xstrdup(ssl_cert);
481 credential_fill(&cert_auth);
482 }
483 return 1;
484 }
485
486 #if LIBCURL_VERSION_NUM >= 0x071900
487 static void set_curl_keepalive(CURL *c)
488 {
489 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
490 }
491
492 #elif LIBCURL_VERSION_NUM >= 0x071000
493 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
494 {
495 int ka = 1;
496 int rc;
497 socklen_t len = (socklen_t)sizeof(ka);
498
499 if (type != CURLSOCKTYPE_IPCXN)
500 return 0;
501
502 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
503 if (rc < 0)
504 warning_errno("unable to set SO_KEEPALIVE on socket");
505
506 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
507 }
508
509 static void set_curl_keepalive(CURL *c)
510 {
511 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
512 }
513
514 #else
515 static void set_curl_keepalive(CURL *c)
516 {
517 /* not supported on older curl versions */
518 }
519 #endif
520
521 static void redact_sensitive_header(struct strbuf *header)
522 {
523 const char *sensitive_header;
524
525 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
526 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
527 /* The first token is the type, which is OK to log */
528 while (isspace(*sensitive_header))
529 sensitive_header++;
530 while (*sensitive_header && !isspace(*sensitive_header))
531 sensitive_header++;
532 /* Everything else is opaque and possibly sensitive */
533 strbuf_setlen(header, sensitive_header - header->buf);
534 strbuf_addstr(header, " <redacted>");
535 }
536 }
537
538 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
539 {
540 struct strbuf out = STRBUF_INIT;
541 struct strbuf **headers, **header;
542
543 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
544 text, (long)size, (long)size);
545 trace_strbuf(&trace_curl, &out);
546 strbuf_reset(&out);
547 strbuf_add(&out, ptr, size);
548 headers = strbuf_split_max(&out, '\n', 0);
549
550 for (header = headers; *header; header++) {
551 if (hide_sensitive_header)
552 redact_sensitive_header(*header);
553 strbuf_insert((*header), 0, text, strlen(text));
554 strbuf_insert((*header), strlen(text), ": ", 2);
555 strbuf_rtrim((*header));
556 strbuf_addch((*header), '\n');
557 trace_strbuf(&trace_curl, (*header));
558 }
559 strbuf_list_free(headers);
560 strbuf_release(&out);
561 }
562
563 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
564 {
565 size_t i;
566 struct strbuf out = STRBUF_INIT;
567 unsigned int width = 60;
568
569 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
570 text, (long)size, (long)size);
571 trace_strbuf(&trace_curl, &out);
572
573 for (i = 0; i < size; i += width) {
574 size_t w;
575
576 strbuf_reset(&out);
577 strbuf_addf(&out, "%s: ", text);
578 for (w = 0; (w < width) && (i + w < size); w++) {
579 unsigned char ch = ptr[i + w];
580
581 strbuf_addch(&out,
582 (ch >= 0x20) && (ch < 0x80)
583 ? ch : '.');
584 }
585 strbuf_addch(&out, '\n');
586 trace_strbuf(&trace_curl, &out);
587 }
588 strbuf_release(&out);
589 }
590
591 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
592 {
593 const char *text;
594 enum { NO_FILTER = 0, DO_FILTER = 1 };
595
596 switch (type) {
597 case CURLINFO_TEXT:
598 trace_printf_key(&trace_curl, "== Info: %s", data);
599 default: /* we ignore unknown types by default */
600 return 0;
601
602 case CURLINFO_HEADER_OUT:
603 text = "=> Send header";
604 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
605 break;
606 case CURLINFO_DATA_OUT:
607 text = "=> Send data";
608 curl_dump_data(text, (unsigned char *)data, size);
609 break;
610 case CURLINFO_SSL_DATA_OUT:
611 text = "=> Send SSL data";
612 curl_dump_data(text, (unsigned char *)data, size);
613 break;
614 case CURLINFO_HEADER_IN:
615 text = "<= Recv header";
616 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
617 break;
618 case CURLINFO_DATA_IN:
619 text = "<= Recv data";
620 curl_dump_data(text, (unsigned char *)data, size);
621 break;
622 case CURLINFO_SSL_DATA_IN:
623 text = "<= Recv SSL data";
624 curl_dump_data(text, (unsigned char *)data, size);
625 break;
626 }
627 return 0;
628 }
629
630 void setup_curl_trace(CURL *handle)
631 {
632 if (!trace_want(&trace_curl))
633 return;
634 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
635 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
636 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
637 }
638
639 static long get_curl_allowed_protocols(int from_user)
640 {
641 long allowed_protocols = 0;
642
643 if (is_transport_allowed("http", from_user))
644 allowed_protocols |= CURLPROTO_HTTP;
645 if (is_transport_allowed("https", from_user))
646 allowed_protocols |= CURLPROTO_HTTPS;
647 if (is_transport_allowed("ftp", from_user))
648 allowed_protocols |= CURLPROTO_FTP;
649 if (is_transport_allowed("ftps", from_user))
650 allowed_protocols |= CURLPROTO_FTPS;
651
652 return allowed_protocols;
653 }
654
655 static CURL *get_curl_handle(void)
656 {
657 CURL *result = curl_easy_init();
658
659 if (!result)
660 die("curl_easy_init failed");
661
662 if (!curl_ssl_verify) {
663 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
664 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
665 } else {
666 /* Verify authenticity of the peer's certificate */
667 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
668 /* The name in the cert must match whom we tried to connect */
669 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
670 }
671
672 #if LIBCURL_VERSION_NUM >= 0x070907
673 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
674 #endif
675 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
676 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
677 #endif
678
679 #if LIBCURL_VERSION_NUM >= 0x071600
680 if (curl_deleg) {
681 int i;
682 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
683 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
684 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
685 curl_deleg_levels[i].curl_deleg_param);
686 break;
687 }
688 }
689 if (i == ARRAY_SIZE(curl_deleg_levels))
690 warning("Unknown delegation method '%s': using default",
691 curl_deleg);
692 }
693 #endif
694
695 if (http_proactive_auth)
696 init_curl_http_auth(result);
697
698 if (getenv("GIT_SSL_VERSION"))
699 ssl_version = getenv("GIT_SSL_VERSION");
700 if (ssl_version && *ssl_version) {
701 int i;
702 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
703 if (!strcmp(ssl_version, sslversions[i].name)) {
704 curl_easy_setopt(result, CURLOPT_SSLVERSION,
705 sslversions[i].ssl_version);
706 break;
707 }
708 }
709 if (i == ARRAY_SIZE(sslversions))
710 warning("unsupported ssl version %s: using default",
711 ssl_version);
712 }
713
714 if (getenv("GIT_SSL_CIPHER_LIST"))
715 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
716 if (ssl_cipherlist != NULL && *ssl_cipherlist)
717 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
718 ssl_cipherlist);
719
720 if (ssl_cert != NULL)
721 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
722 if (has_cert_password())
723 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
724 #if LIBCURL_VERSION_NUM >= 0x070903
725 if (ssl_key != NULL)
726 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
727 #endif
728 #if LIBCURL_VERSION_NUM >= 0x070908
729 if (ssl_capath != NULL)
730 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
731 #endif
732 #if LIBCURL_VERSION_NUM >= 0x072c00
733 if (ssl_pinnedkey != NULL)
734 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
735 #endif
736 if (ssl_cainfo != NULL)
737 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
738
739 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
740 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
741 curl_low_speed_limit);
742 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
743 curl_low_speed_time);
744 }
745
746 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
747 #if LIBCURL_VERSION_NUM >= 0x071301
748 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
749 #elif LIBCURL_VERSION_NUM >= 0x071101
750 curl_easy_setopt(result, CURLOPT_POST301, 1);
751 #endif
752 #if LIBCURL_VERSION_NUM >= 0x071304
753 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
754 get_curl_allowed_protocols(0));
755 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
756 get_curl_allowed_protocols(-1));
757 #else
758 warning("protocol restrictions not applied to curl redirects because\n"
759 "your curl version is too old (>= 7.19.4)");
760 #endif
761 if (getenv("GIT_CURL_VERBOSE"))
762 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
763 setup_curl_trace(result);
764
765 curl_easy_setopt(result, CURLOPT_USERAGENT,
766 user_agent ? user_agent : git_user_agent());
767
768 if (curl_ftp_no_epsv)
769 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
770
771 #ifdef CURLOPT_USE_SSL
772 if (curl_ssl_try)
773 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
774 #endif
775
776 /*
777 * CURL also examines these variables as a fallback; but we need to query
778 * them here in order to decide whether to prompt for missing password (cf.
779 * init_curl_proxy_auth()).
780 *
781 * Unlike many other common environment variables, these are historically
782 * lowercase only. It appears that CURL did not know this and implemented
783 * only uppercase variants, which was later corrected to take both - with
784 * the exception of http_proxy, which is lowercase only also in CURL. As
785 * the lowercase versions are the historical quasi-standard, they take
786 * precedence here, as in CURL.
787 */
788 if (!curl_http_proxy) {
789 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
790 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
791 var_override(&curl_http_proxy, getenv("https_proxy"));
792 } else {
793 var_override(&curl_http_proxy, getenv("http_proxy"));
794 }
795 if (!curl_http_proxy) {
796 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
797 var_override(&curl_http_proxy, getenv("all_proxy"));
798 }
799 }
800
801 if (curl_http_proxy) {
802 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
803 #if LIBCURL_VERSION_NUM >= 0x071800
804 if (starts_with(curl_http_proxy, "socks5h"))
805 curl_easy_setopt(result,
806 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
807 else if (starts_with(curl_http_proxy, "socks5"))
808 curl_easy_setopt(result,
809 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
810 else if (starts_with(curl_http_proxy, "socks4a"))
811 curl_easy_setopt(result,
812 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
813 else if (starts_with(curl_http_proxy, "socks"))
814 curl_easy_setopt(result,
815 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
816 #endif
817 if (strstr(curl_http_proxy, "://"))
818 credential_from_url(&proxy_auth, curl_http_proxy);
819 else {
820 struct strbuf url = STRBUF_INIT;
821 strbuf_addf(&url, "http://%s", curl_http_proxy);
822 credential_from_url(&proxy_auth, url.buf);
823 strbuf_release(&url);
824 }
825
826 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
827 #if LIBCURL_VERSION_NUM >= 0x071304
828 var_override(&curl_no_proxy, getenv("NO_PROXY"));
829 var_override(&curl_no_proxy, getenv("no_proxy"));
830 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
831 #endif
832 }
833 init_curl_proxy_auth(result);
834
835 set_curl_keepalive(result);
836
837 return result;
838 }
839
840 static void set_from_env(const char **var, const char *envname)
841 {
842 const char *val = getenv(envname);
843 if (val)
844 *var = val;
845 }
846
847 void http_init(struct remote *remote, const char *url, int proactive_auth)
848 {
849 char *low_speed_limit;
850 char *low_speed_time;
851 char *normalized_url;
852 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
853
854 config.section = "http";
855 config.key = NULL;
856 config.collect_fn = http_options;
857 config.cascade_fn = git_default_config;
858 config.cb = NULL;
859
860 http_is_verbose = 0;
861 normalized_url = url_normalize(url, &config.url);
862
863 git_config(urlmatch_config_entry, &config);
864 free(normalized_url);
865
866 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
867 die("curl_global_init failed");
868
869 http_proactive_auth = proactive_auth;
870
871 if (remote && remote->http_proxy)
872 curl_http_proxy = xstrdup(remote->http_proxy);
873
874 if (remote)
875 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
876
877 pragma_header = curl_slist_append(http_copy_default_headers(),
878 "Pragma: no-cache");
879 no_pragma_header = curl_slist_append(http_copy_default_headers(),
880 "Pragma:");
881
882 #ifdef USE_CURL_MULTI
883 {
884 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
885 if (http_max_requests != NULL)
886 max_requests = atoi(http_max_requests);
887 }
888
889 curlm = curl_multi_init();
890 if (!curlm)
891 die("curl_multi_init failed");
892 #endif
893
894 if (getenv("GIT_SSL_NO_VERIFY"))
895 curl_ssl_verify = 0;
896
897 set_from_env(&ssl_cert, "GIT_SSL_CERT");
898 #if LIBCURL_VERSION_NUM >= 0x070903
899 set_from_env(&ssl_key, "GIT_SSL_KEY");
900 #endif
901 #if LIBCURL_VERSION_NUM >= 0x070908
902 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
903 #endif
904 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
905
906 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
907
908 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
909 if (low_speed_limit != NULL)
910 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
911 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
912 if (low_speed_time != NULL)
913 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
914
915 if (curl_ssl_verify == -1)
916 curl_ssl_verify = 1;
917
918 curl_session_count = 0;
919 #ifdef USE_CURL_MULTI
920 if (max_requests < 1)
921 max_requests = DEFAULT_MAX_REQUESTS;
922 #endif
923
924 if (getenv("GIT_CURL_FTP_NO_EPSV"))
925 curl_ftp_no_epsv = 1;
926
927 if (url) {
928 credential_from_url(&http_auth, url);
929 if (!ssl_cert_password_required &&
930 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
931 starts_with(url, "https://"))
932 ssl_cert_password_required = 1;
933 }
934
935 #ifndef NO_CURL_EASY_DUPHANDLE
936 curl_default = get_curl_handle();
937 #endif
938 }
939
940 void http_cleanup(void)
941 {
942 struct active_request_slot *slot = active_queue_head;
943
944 while (slot != NULL) {
945 struct active_request_slot *next = slot->next;
946 if (slot->curl != NULL) {
947 xmulti_remove_handle(slot);
948 curl_easy_cleanup(slot->curl);
949 }
950 free(slot);
951 slot = next;
952 }
953 active_queue_head = NULL;
954
955 #ifndef NO_CURL_EASY_DUPHANDLE
956 curl_easy_cleanup(curl_default);
957 #endif
958
959 #ifdef USE_CURL_MULTI
960 curl_multi_cleanup(curlm);
961 #endif
962 curl_global_cleanup();
963
964 curl_slist_free_all(extra_http_headers);
965 extra_http_headers = NULL;
966
967 curl_slist_free_all(pragma_header);
968 pragma_header = NULL;
969
970 curl_slist_free_all(no_pragma_header);
971 no_pragma_header = NULL;
972
973 if (curl_http_proxy) {
974 free((void *)curl_http_proxy);
975 curl_http_proxy = NULL;
976 }
977
978 if (proxy_auth.password) {
979 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
980 free(proxy_auth.password);
981 proxy_auth.password = NULL;
982 }
983
984 free((void *)curl_proxyuserpwd);
985 curl_proxyuserpwd = NULL;
986
987 free((void *)http_proxy_authmethod);
988 http_proxy_authmethod = NULL;
989
990 if (cert_auth.password != NULL) {
991 memset(cert_auth.password, 0, strlen(cert_auth.password));
992 free(cert_auth.password);
993 cert_auth.password = NULL;
994 }
995 ssl_cert_password_required = 0;
996
997 free(cached_accept_language);
998 cached_accept_language = NULL;
999 }
1000
1001 struct active_request_slot *get_active_slot(void)
1002 {
1003 struct active_request_slot *slot = active_queue_head;
1004 struct active_request_slot *newslot;
1005
1006 #ifdef USE_CURL_MULTI
1007 int num_transfers;
1008
1009 /* Wait for a slot to open up if the queue is full */
1010 while (active_requests >= max_requests) {
1011 curl_multi_perform(curlm, &num_transfers);
1012 if (num_transfers < active_requests)
1013 process_curl_messages();
1014 }
1015 #endif
1016
1017 while (slot != NULL && slot->in_use)
1018 slot = slot->next;
1019
1020 if (slot == NULL) {
1021 newslot = xmalloc(sizeof(*newslot));
1022 newslot->curl = NULL;
1023 newslot->in_use = 0;
1024 newslot->next = NULL;
1025
1026 slot = active_queue_head;
1027 if (slot == NULL) {
1028 active_queue_head = newslot;
1029 } else {
1030 while (slot->next != NULL)
1031 slot = slot->next;
1032 slot->next = newslot;
1033 }
1034 slot = newslot;
1035 }
1036
1037 if (slot->curl == NULL) {
1038 #ifdef NO_CURL_EASY_DUPHANDLE
1039 slot->curl = get_curl_handle();
1040 #else
1041 slot->curl = curl_easy_duphandle(curl_default);
1042 #endif
1043 curl_session_count++;
1044 }
1045
1046 active_requests++;
1047 slot->in_use = 1;
1048 slot->results = NULL;
1049 slot->finished = NULL;
1050 slot->callback_data = NULL;
1051 slot->callback_func = NULL;
1052 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1053 if (curl_save_cookies)
1054 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1055 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1056 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1057 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1058 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1059 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1060 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1061 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1062 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1063 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1064 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1065
1066 /*
1067 * Default following to off unless "ALWAYS" is configured; this gives
1068 * callers a sane starting point, and they can tweak for individual
1069 * HTTP_FOLLOW_* cases themselves.
1070 */
1071 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1072 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1073 else
1074 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1075
1076 #if LIBCURL_VERSION_NUM >= 0x070a08
1077 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1078 #endif
1079 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1080 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1081 #endif
1082 if (http_auth.password || curl_empty_auth)
1083 init_curl_http_auth(slot->curl);
1084
1085 return slot;
1086 }
1087
1088 int start_active_slot(struct active_request_slot *slot)
1089 {
1090 #ifdef USE_CURL_MULTI
1091 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1092 int num_transfers;
1093
1094 if (curlm_result != CURLM_OK &&
1095 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1096 warning("curl_multi_add_handle failed: %s",
1097 curl_multi_strerror(curlm_result));
1098 active_requests--;
1099 slot->in_use = 0;
1100 return 0;
1101 }
1102
1103 /*
1104 * We know there must be something to do, since we just added
1105 * something.
1106 */
1107 curl_multi_perform(curlm, &num_transfers);
1108 #endif
1109 return 1;
1110 }
1111
1112 #ifdef USE_CURL_MULTI
1113 struct fill_chain {
1114 void *data;
1115 int (*fill)(void *);
1116 struct fill_chain *next;
1117 };
1118
1119 static struct fill_chain *fill_cfg;
1120
1121 void add_fill_function(void *data, int (*fill)(void *))
1122 {
1123 struct fill_chain *new = xmalloc(sizeof(*new));
1124 struct fill_chain **linkp = &fill_cfg;
1125 new->data = data;
1126 new->fill = fill;
1127 new->next = NULL;
1128 while (*linkp)
1129 linkp = &(*linkp)->next;
1130 *linkp = new;
1131 }
1132
1133 void fill_active_slots(void)
1134 {
1135 struct active_request_slot *slot = active_queue_head;
1136
1137 while (active_requests < max_requests) {
1138 struct fill_chain *fill;
1139 for (fill = fill_cfg; fill; fill = fill->next)
1140 if (fill->fill(fill->data))
1141 break;
1142
1143 if (!fill)
1144 break;
1145 }
1146
1147 while (slot != NULL) {
1148 if (!slot->in_use && slot->curl != NULL
1149 && curl_session_count > min_curl_sessions) {
1150 curl_easy_cleanup(slot->curl);
1151 slot->curl = NULL;
1152 curl_session_count--;
1153 }
1154 slot = slot->next;
1155 }
1156 }
1157
1158 void step_active_slots(void)
1159 {
1160 int num_transfers;
1161 CURLMcode curlm_result;
1162
1163 do {
1164 curlm_result = curl_multi_perform(curlm, &num_transfers);
1165 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1166 if (num_transfers < active_requests) {
1167 process_curl_messages();
1168 fill_active_slots();
1169 }
1170 }
1171 #endif
1172
1173 void run_active_slot(struct active_request_slot *slot)
1174 {
1175 #ifdef USE_CURL_MULTI
1176 fd_set readfds;
1177 fd_set writefds;
1178 fd_set excfds;
1179 int max_fd;
1180 struct timeval select_timeout;
1181 int finished = 0;
1182
1183 slot->finished = &finished;
1184 while (!finished) {
1185 step_active_slots();
1186
1187 if (slot->in_use) {
1188 #if LIBCURL_VERSION_NUM >= 0x070f04
1189 long curl_timeout;
1190 curl_multi_timeout(curlm, &curl_timeout);
1191 if (curl_timeout == 0) {
1192 continue;
1193 } else if (curl_timeout == -1) {
1194 select_timeout.tv_sec = 0;
1195 select_timeout.tv_usec = 50000;
1196 } else {
1197 select_timeout.tv_sec = curl_timeout / 1000;
1198 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1199 }
1200 #else
1201 select_timeout.tv_sec = 0;
1202 select_timeout.tv_usec = 50000;
1203 #endif
1204
1205 max_fd = -1;
1206 FD_ZERO(&readfds);
1207 FD_ZERO(&writefds);
1208 FD_ZERO(&excfds);
1209 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1210
1211 /*
1212 * It can happen that curl_multi_timeout returns a pathologically
1213 * long timeout when curl_multi_fdset returns no file descriptors
1214 * to read. See commit message for more details.
1215 */
1216 if (max_fd < 0 &&
1217 (select_timeout.tv_sec > 0 ||
1218 select_timeout.tv_usec > 50000)) {
1219 select_timeout.tv_sec = 0;
1220 select_timeout.tv_usec = 50000;
1221 }
1222
1223 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1224 }
1225 }
1226 #else
1227 while (slot->in_use) {
1228 slot->curl_result = curl_easy_perform(slot->curl);
1229 finish_active_slot(slot);
1230 }
1231 #endif
1232 }
1233
1234 static void release_active_slot(struct active_request_slot *slot)
1235 {
1236 closedown_active_slot(slot);
1237 if (slot->curl) {
1238 xmulti_remove_handle(slot);
1239 if (curl_session_count > min_curl_sessions) {
1240 curl_easy_cleanup(slot->curl);
1241 slot->curl = NULL;
1242 curl_session_count--;
1243 }
1244 }
1245 #ifdef USE_CURL_MULTI
1246 fill_active_slots();
1247 #endif
1248 }
1249
1250 void finish_all_active_slots(void)
1251 {
1252 struct active_request_slot *slot = active_queue_head;
1253
1254 while (slot != NULL)
1255 if (slot->in_use) {
1256 run_active_slot(slot);
1257 slot = active_queue_head;
1258 } else {
1259 slot = slot->next;
1260 }
1261 }
1262
1263 /* Helpers for modifying and creating URLs */
1264 static inline int needs_quote(int ch)
1265 {
1266 if (((ch >= 'A') && (ch <= 'Z'))
1267 || ((ch >= 'a') && (ch <= 'z'))
1268 || ((ch >= '0') && (ch <= '9'))
1269 || (ch == '/')
1270 || (ch == '-')
1271 || (ch == '.'))
1272 return 0;
1273 return 1;
1274 }
1275
1276 static char *quote_ref_url(const char *base, const char *ref)
1277 {
1278 struct strbuf buf = STRBUF_INIT;
1279 const char *cp;
1280 int ch;
1281
1282 end_url_with_slash(&buf, base);
1283
1284 for (cp = ref; (ch = *cp) != 0; cp++)
1285 if (needs_quote(ch))
1286 strbuf_addf(&buf, "%%%02x", ch);
1287 else
1288 strbuf_addch(&buf, *cp);
1289
1290 return strbuf_detach(&buf, NULL);
1291 }
1292
1293 void append_remote_object_url(struct strbuf *buf, const char *url,
1294 const char *hex,
1295 int only_two_digit_prefix)
1296 {
1297 end_url_with_slash(buf, url);
1298
1299 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1300 if (!only_two_digit_prefix)
1301 strbuf_addstr(buf, hex + 2);
1302 }
1303
1304 char *get_remote_object_url(const char *url, const char *hex,
1305 int only_two_digit_prefix)
1306 {
1307 struct strbuf buf = STRBUF_INIT;
1308 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1309 return strbuf_detach(&buf, NULL);
1310 }
1311
1312 static int handle_curl_result(struct slot_results *results)
1313 {
1314 /*
1315 * If we see a failing http code with CURLE_OK, we have turned off
1316 * FAILONERROR (to keep the server's custom error response), and should
1317 * translate the code into failure here.
1318 *
1319 * Likewise, if we see a redirect (30x code), that means we turned off
1320 * redirect-following, and we should treat the result as an error.
1321 */
1322 if (results->curl_result == CURLE_OK &&
1323 results->http_code >= 300) {
1324 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1325 /*
1326 * Normally curl will already have put the "reason phrase"
1327 * from the server into curl_errorstr; unfortunately without
1328 * FAILONERROR it is lost, so we can give only the numeric
1329 * status code.
1330 */
1331 snprintf(curl_errorstr, sizeof(curl_errorstr),
1332 "The requested URL returned error: %ld",
1333 results->http_code);
1334 }
1335
1336 if (results->curl_result == CURLE_OK) {
1337 credential_approve(&http_auth);
1338 if (proxy_auth.password)
1339 credential_approve(&proxy_auth);
1340 return HTTP_OK;
1341 } else if (missing_target(results))
1342 return HTTP_MISSING_TARGET;
1343 else if (results->http_code == 401) {
1344 if (http_auth.username && http_auth.password) {
1345 credential_reject(&http_auth);
1346 return HTTP_NOAUTH;
1347 } else {
1348 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1349 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1350 #endif
1351 return HTTP_REAUTH;
1352 }
1353 } else {
1354 if (results->http_connectcode == 407)
1355 credential_reject(&proxy_auth);
1356 #if LIBCURL_VERSION_NUM >= 0x070c00
1357 if (!curl_errorstr[0])
1358 strlcpy(curl_errorstr,
1359 curl_easy_strerror(results->curl_result),
1360 sizeof(curl_errorstr));
1361 #endif
1362 return HTTP_ERROR;
1363 }
1364 }
1365
1366 int run_one_slot(struct active_request_slot *slot,
1367 struct slot_results *results)
1368 {
1369 slot->results = results;
1370 if (!start_active_slot(slot)) {
1371 snprintf(curl_errorstr, sizeof(curl_errorstr),
1372 "failed to start HTTP request");
1373 return HTTP_START_FAILED;
1374 }
1375
1376 run_active_slot(slot);
1377 return handle_curl_result(results);
1378 }
1379
1380 struct curl_slist *http_copy_default_headers(void)
1381 {
1382 struct curl_slist *headers = NULL, *h;
1383
1384 for (h = extra_http_headers; h; h = h->next)
1385 headers = curl_slist_append(headers, h->data);
1386
1387 return headers;
1388 }
1389
1390 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1391 {
1392 char *ptr;
1393 CURLcode ret;
1394
1395 strbuf_reset(buf);
1396 ret = curl_easy_getinfo(curl, info, &ptr);
1397 if (!ret && ptr)
1398 strbuf_addstr(buf, ptr);
1399 return ret;
1400 }
1401
1402 /*
1403 * Check for and extract a content-type parameter. "raw"
1404 * should be positioned at the start of the potential
1405 * parameter, with any whitespace already removed.
1406 *
1407 * "name" is the name of the parameter. The value is appended
1408 * to "out".
1409 */
1410 static int extract_param(const char *raw, const char *name,
1411 struct strbuf *out)
1412 {
1413 size_t len = strlen(name);
1414
1415 if (strncasecmp(raw, name, len))
1416 return -1;
1417 raw += len;
1418
1419 if (*raw != '=')
1420 return -1;
1421 raw++;
1422
1423 while (*raw && !isspace(*raw) && *raw != ';')
1424 strbuf_addch(out, *raw++);
1425 return 0;
1426 }
1427
1428 /*
1429 * Extract a normalized version of the content type, with any
1430 * spaces suppressed, all letters lowercased, and no trailing ";"
1431 * or parameters.
1432 *
1433 * Note that we will silently remove even invalid whitespace. For
1434 * example, "text / plain" is specifically forbidden by RFC 2616,
1435 * but "text/plain" is the only reasonable output, and this keeps
1436 * our code simple.
1437 *
1438 * If the "charset" argument is not NULL, store the value of any
1439 * charset parameter there.
1440 *
1441 * Example:
1442 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1443 * "text / plain" -> "text/plain"
1444 */
1445 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1446 struct strbuf *charset)
1447 {
1448 const char *p;
1449
1450 strbuf_reset(type);
1451 strbuf_grow(type, raw->len);
1452 for (p = raw->buf; *p; p++) {
1453 if (isspace(*p))
1454 continue;
1455 if (*p == ';') {
1456 p++;
1457 break;
1458 }
1459 strbuf_addch(type, tolower(*p));
1460 }
1461
1462 if (!charset)
1463 return;
1464
1465 strbuf_reset(charset);
1466 while (*p) {
1467 while (isspace(*p) || *p == ';')
1468 p++;
1469 if (!extract_param(p, "charset", charset))
1470 return;
1471 while (*p && !isspace(*p))
1472 p++;
1473 }
1474
1475 if (!charset->len && starts_with(type->buf, "text/"))
1476 strbuf_addstr(charset, "ISO-8859-1");
1477 }
1478
1479 static void write_accept_language(struct strbuf *buf)
1480 {
1481 /*
1482 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1483 * that, q-value will be smaller than 0.001, the minimum q-value the
1484 * HTTP specification allows. See
1485 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1486 */
1487 const int MAX_DECIMAL_PLACES = 3;
1488 const int MAX_LANGUAGE_TAGS = 1000;
1489 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1490 char **language_tags = NULL;
1491 int num_langs = 0;
1492 const char *s = get_preferred_languages();
1493 int i;
1494 struct strbuf tag = STRBUF_INIT;
1495
1496 /* Don't add Accept-Language header if no language is preferred. */
1497 if (!s)
1498 return;
1499
1500 /*
1501 * Split the colon-separated string of preferred languages into
1502 * language_tags array.
1503 */
1504 do {
1505 /* collect language tag */
1506 for (; *s && (isalnum(*s) || *s == '_'); s++)
1507 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1508
1509 /* skip .codeset, @modifier and any other unnecessary parts */
1510 while (*s && *s != ':')
1511 s++;
1512
1513 if (tag.len) {
1514 num_langs++;
1515 REALLOC_ARRAY(language_tags, num_langs);
1516 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1517 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1518 break;
1519 }
1520 } while (*s++);
1521
1522 /* write Accept-Language header into buf */
1523 if (num_langs) {
1524 int last_buf_len = 0;
1525 int max_q;
1526 int decimal_places;
1527 char q_format[32];
1528
1529 /* add '*' */
1530 REALLOC_ARRAY(language_tags, num_langs + 1);
1531 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1532
1533 /* compute decimal_places */
1534 for (max_q = 1, decimal_places = 0;
1535 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1536 decimal_places++, max_q *= 10)
1537 ;
1538
1539 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1540
1541 strbuf_addstr(buf, "Accept-Language: ");
1542
1543 for (i = 0; i < num_langs; i++) {
1544 if (i > 0)
1545 strbuf_addstr(buf, ", ");
1546
1547 strbuf_addstr(buf, language_tags[i]);
1548
1549 if (i > 0)
1550 strbuf_addf(buf, q_format, max_q - i);
1551
1552 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1553 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1554 break;
1555 }
1556
1557 last_buf_len = buf->len;
1558 }
1559 }
1560
1561 /* free language tags -- last one is a static '*' */
1562 for (i = 0; i < num_langs - 1; i++)
1563 free(language_tags[i]);
1564 free(language_tags);
1565 }
1566
1567 /*
1568 * Get an Accept-Language header which indicates user's preferred languages.
1569 *
1570 * Examples:
1571 * LANGUAGE= -> ""
1572 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1573 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1574 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1575 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1576 * LANGUAGE= LANG=C -> ""
1577 */
1578 static const char *get_accept_language(void)
1579 {
1580 if (!cached_accept_language) {
1581 struct strbuf buf = STRBUF_INIT;
1582 write_accept_language(&buf);
1583 if (buf.len > 0)
1584 cached_accept_language = strbuf_detach(&buf, NULL);
1585 }
1586
1587 return cached_accept_language;
1588 }
1589
1590 static void http_opt_request_remainder(CURL *curl, off_t pos)
1591 {
1592 char buf[128];
1593 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1594 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1595 }
1596
1597 /* http_request() targets */
1598 #define HTTP_REQUEST_STRBUF 0
1599 #define HTTP_REQUEST_FILE 1
1600
1601 static int http_request(const char *url,
1602 void *result, int target,
1603 const struct http_get_options *options)
1604 {
1605 struct active_request_slot *slot;
1606 struct slot_results results;
1607 struct curl_slist *headers = http_copy_default_headers();
1608 struct strbuf buf = STRBUF_INIT;
1609 const char *accept_language;
1610 int ret;
1611
1612 slot = get_active_slot();
1613 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1614
1615 if (result == NULL) {
1616 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1617 } else {
1618 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1619 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1620
1621 if (target == HTTP_REQUEST_FILE) {
1622 off_t posn = ftello(result);
1623 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1624 fwrite);
1625 if (posn > 0)
1626 http_opt_request_remainder(slot->curl, posn);
1627 } else
1628 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1629 fwrite_buffer);
1630 }
1631
1632 accept_language = get_accept_language();
1633
1634 if (accept_language)
1635 headers = curl_slist_append(headers, accept_language);
1636
1637 strbuf_addstr(&buf, "Pragma:");
1638 if (options && options->no_cache)
1639 strbuf_addstr(&buf, " no-cache");
1640 if (options && options->keep_error)
1641 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1642 if (options && options->initial_request &&
1643 http_follow_config == HTTP_FOLLOW_INITIAL)
1644 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1645
1646 headers = curl_slist_append(headers, buf.buf);
1647
1648 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1649 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1650 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1651
1652 ret = run_one_slot(slot, &results);
1653
1654 if (options && options->content_type) {
1655 struct strbuf raw = STRBUF_INIT;
1656 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1657 extract_content_type(&raw, options->content_type,
1658 options->charset);
1659 strbuf_release(&raw);
1660 }
1661
1662 if (options && options->effective_url)
1663 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1664 options->effective_url);
1665
1666 curl_slist_free_all(headers);
1667 strbuf_release(&buf);
1668
1669 return ret;
1670 }
1671
1672 /*
1673 * Update the "base" url to a more appropriate value, as deduced by
1674 * redirects seen when requesting a URL starting with "url".
1675 *
1676 * The "asked" parameter is a URL that we asked curl to access, and must begin
1677 * with "base".
1678 *
1679 * The "got" parameter is the URL that curl reported to us as where we ended
1680 * up.
1681 *
1682 * Returns 1 if we updated the base url, 0 otherwise.
1683 *
1684 * Our basic strategy is to compare "base" and "asked" to find the bits
1685 * specific to our request. We then strip those bits off of "got" to yield the
1686 * new base. So for example, if our base is "http://example.com/foo.git",
1687 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1688 * with "https://other.example.com/foo.git/info/refs". We would want the
1689 * new URL to become "https://other.example.com/foo.git".
1690 *
1691 * Note that this assumes a sane redirect scheme. It's entirely possible
1692 * in the example above to end up at a URL that does not even end in
1693 * "info/refs". In such a case we die. There's not much we can do, such a
1694 * scheme is unlikely to represent a real git repository, and failing to
1695 * rewrite the base opens options for malicious redirects to do funny things.
1696 */
1697 static int update_url_from_redirect(struct strbuf *base,
1698 const char *asked,
1699 const struct strbuf *got)
1700 {
1701 const char *tail;
1702 size_t new_len;
1703
1704 if (!strcmp(asked, got->buf))
1705 return 0;
1706
1707 if (!skip_prefix(asked, base->buf, &tail))
1708 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1709 asked, base->buf);
1710
1711 new_len = got->len;
1712 if (!strip_suffix_mem(got->buf, &new_len, tail))
1713 die(_("unable to update url base from redirection:\n"
1714 " asked for: %s\n"
1715 " redirect: %s"),
1716 asked, got->buf);
1717
1718 strbuf_reset(base);
1719 strbuf_add(base, got->buf, new_len);
1720
1721 return 1;
1722 }
1723
1724 static int http_request_reauth(const char *url,
1725 void *result, int target,
1726 struct http_get_options *options)
1727 {
1728 int ret = http_request(url, result, target, options);
1729
1730 if (options && options->effective_url && options->base_url) {
1731 if (update_url_from_redirect(options->base_url,
1732 url, options->effective_url)) {
1733 credential_from_url(&http_auth, options->base_url->buf);
1734 url = options->effective_url->buf;
1735 }
1736 }
1737
1738 if (ret != HTTP_REAUTH)
1739 return ret;
1740
1741 /*
1742 * If we are using KEEP_ERROR, the previous request may have
1743 * put cruft into our output stream; we should clear it out before
1744 * making our next request. We only know how to do this for
1745 * the strbuf case, but that is enough to satisfy current callers.
1746 */
1747 if (options && options->keep_error) {
1748 switch (target) {
1749 case HTTP_REQUEST_STRBUF:
1750 strbuf_reset(result);
1751 break;
1752 default:
1753 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1754 }
1755 }
1756
1757 credential_fill(&http_auth);
1758
1759 return http_request(url, result, target, options);
1760 }
1761
1762 int http_get_strbuf(const char *url,
1763 struct strbuf *result,
1764 struct http_get_options *options)
1765 {
1766 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1767 }
1768
1769 /*
1770 * Downloads a URL and stores the result in the given file.
1771 *
1772 * If a previous interrupted download is detected (i.e. a previous temporary
1773 * file is still around) the download is resumed.
1774 */
1775 static int http_get_file(const char *url, const char *filename,
1776 struct http_get_options *options)
1777 {
1778 int ret;
1779 struct strbuf tmpfile = STRBUF_INIT;
1780 FILE *result;
1781
1782 strbuf_addf(&tmpfile, "%s.temp", filename);
1783 result = fopen(tmpfile.buf, "a");
1784 if (!result) {
1785 error("Unable to open local file %s", tmpfile.buf);
1786 ret = HTTP_ERROR;
1787 goto cleanup;
1788 }
1789
1790 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1791 fclose(result);
1792
1793 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1794 ret = HTTP_ERROR;
1795 cleanup:
1796 strbuf_release(&tmpfile);
1797 return ret;
1798 }
1799
1800 int http_fetch_ref(const char *base, struct ref *ref)
1801 {
1802 struct http_get_options options = {0};
1803 char *url;
1804 struct strbuf buffer = STRBUF_INIT;
1805 int ret = -1;
1806
1807 options.no_cache = 1;
1808
1809 url = quote_ref_url(base, ref->name);
1810 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1811 strbuf_rtrim(&buffer);
1812 if (buffer.len == 40)
1813 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1814 else if (starts_with(buffer.buf, "ref: ")) {
1815 ref->symref = xstrdup(buffer.buf + 5);
1816 ret = 0;
1817 }
1818 }
1819
1820 strbuf_release(&buffer);
1821 free(url);
1822 return ret;
1823 }
1824
1825 /* Helpers for fetching packs */
1826 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1827 {
1828 char *url, *tmp;
1829 struct strbuf buf = STRBUF_INIT;
1830
1831 if (http_is_verbose)
1832 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1833
1834 end_url_with_slash(&buf, base_url);
1835 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1836 url = strbuf_detach(&buf, NULL);
1837
1838 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1839 tmp = strbuf_detach(&buf, NULL);
1840
1841 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1842 error("Unable to get pack index %s", url);
1843 free(tmp);
1844 tmp = NULL;
1845 }
1846
1847 free(url);
1848 return tmp;
1849 }
1850
1851 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1852 unsigned char *sha1, const char *base_url)
1853 {
1854 struct packed_git *new_pack;
1855 char *tmp_idx = NULL;
1856 int ret;
1857
1858 if (has_pack_index(sha1)) {
1859 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1860 if (!new_pack)
1861 return -1; /* parse_pack_index() already issued error message */
1862 goto add_pack;
1863 }
1864
1865 tmp_idx = fetch_pack_index(sha1, base_url);
1866 if (!tmp_idx)
1867 return -1;
1868
1869 new_pack = parse_pack_index(sha1, tmp_idx);
1870 if (!new_pack) {
1871 unlink(tmp_idx);
1872 free(tmp_idx);
1873
1874 return -1; /* parse_pack_index() already issued error message */
1875 }
1876
1877 ret = verify_pack_index(new_pack);
1878 if (!ret) {
1879 close_pack_index(new_pack);
1880 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1881 }
1882 free(tmp_idx);
1883 if (ret)
1884 return -1;
1885
1886 add_pack:
1887 new_pack->next = *packs_head;
1888 *packs_head = new_pack;
1889 return 0;
1890 }
1891
1892 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1893 {
1894 struct http_get_options options = {0};
1895 int ret = 0, i = 0;
1896 char *url, *data;
1897 struct strbuf buf = STRBUF_INIT;
1898 unsigned char sha1[20];
1899
1900 end_url_with_slash(&buf, base_url);
1901 strbuf_addstr(&buf, "objects/info/packs");
1902 url = strbuf_detach(&buf, NULL);
1903
1904 options.no_cache = 1;
1905 ret = http_get_strbuf(url, &buf, &options);
1906 if (ret != HTTP_OK)
1907 goto cleanup;
1908
1909 data = buf.buf;
1910 while (i < buf.len) {
1911 switch (data[i]) {
1912 case 'P':
1913 i++;
1914 if (i + 52 <= buf.len &&
1915 starts_with(data + i, " pack-") &&
1916 starts_with(data + i + 46, ".pack\n")) {
1917 get_sha1_hex(data + i + 6, sha1);
1918 fetch_and_setup_pack_index(packs_head, sha1,
1919 base_url);
1920 i += 51;
1921 break;
1922 }
1923 default:
1924 while (i < buf.len && data[i] != '\n')
1925 i++;
1926 }
1927 i++;
1928 }
1929
1930 cleanup:
1931 free(url);
1932 return ret;
1933 }
1934
1935 void release_http_pack_request(struct http_pack_request *preq)
1936 {
1937 if (preq->packfile != NULL) {
1938 fclose(preq->packfile);
1939 preq->packfile = NULL;
1940 }
1941 preq->slot = NULL;
1942 free(preq->url);
1943 free(preq);
1944 }
1945
1946 int finish_http_pack_request(struct http_pack_request *preq)
1947 {
1948 struct packed_git **lst;
1949 struct packed_git *p = preq->target;
1950 char *tmp_idx;
1951 size_t len;
1952 struct child_process ip = CHILD_PROCESS_INIT;
1953 const char *ip_argv[8];
1954
1955 close_pack_index(p);
1956
1957 fclose(preq->packfile);
1958 preq->packfile = NULL;
1959
1960 lst = preq->lst;
1961 while (*lst != p)
1962 lst = &((*lst)->next);
1963 *lst = (*lst)->next;
1964
1965 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
1966 die("BUG: pack tmpfile does not end in .pack.temp?");
1967 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
1968
1969 ip_argv[0] = "index-pack";
1970 ip_argv[1] = "-o";
1971 ip_argv[2] = tmp_idx;
1972 ip_argv[3] = preq->tmpfile;
1973 ip_argv[4] = NULL;
1974
1975 ip.argv = ip_argv;
1976 ip.git_cmd = 1;
1977 ip.no_stdin = 1;
1978 ip.no_stdout = 1;
1979
1980 if (run_command(&ip)) {
1981 unlink(preq->tmpfile);
1982 unlink(tmp_idx);
1983 free(tmp_idx);
1984 return -1;
1985 }
1986
1987 unlink(sha1_pack_index_name(p->sha1));
1988
1989 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
1990 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
1991 free(tmp_idx);
1992 return -1;
1993 }
1994
1995 install_packed_git(p);
1996 free(tmp_idx);
1997 return 0;
1998 }
1999
2000 struct http_pack_request *new_http_pack_request(
2001 struct packed_git *target, const char *base_url)
2002 {
2003 off_t prev_posn = 0;
2004 struct strbuf buf = STRBUF_INIT;
2005 struct http_pack_request *preq;
2006
2007 preq = xcalloc(1, sizeof(*preq));
2008 preq->target = target;
2009
2010 end_url_with_slash(&buf, base_url);
2011 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2012 sha1_to_hex(target->sha1));
2013 preq->url = strbuf_detach(&buf, NULL);
2014
2015 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2016 sha1_pack_name(target->sha1));
2017 preq->packfile = fopen(preq->tmpfile, "a");
2018 if (!preq->packfile) {
2019 error("Unable to open local file %s for pack",
2020 preq->tmpfile);
2021 goto abort;
2022 }
2023
2024 preq->slot = get_active_slot();
2025 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2026 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2027 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2028 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2029 no_pragma_header);
2030
2031 /*
2032 * If there is data present from a previous transfer attempt,
2033 * resume where it left off
2034 */
2035 prev_posn = ftello(preq->packfile);
2036 if (prev_posn>0) {
2037 if (http_is_verbose)
2038 fprintf(stderr,
2039 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2040 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2041 http_opt_request_remainder(preq->slot->curl, prev_posn);
2042 }
2043
2044 return preq;
2045
2046 abort:
2047 free(preq->url);
2048 free(preq);
2049 return NULL;
2050 }
2051
2052 /* Helpers for fetching objects (loose) */
2053 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2054 void *data)
2055 {
2056 unsigned char expn[4096];
2057 size_t size = eltsize * nmemb;
2058 int posn = 0;
2059 struct http_object_request *freq = data;
2060 struct active_request_slot *slot = freq->slot;
2061
2062 if (slot) {
2063 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2064 &slot->http_code);
2065 if (c != CURLE_OK)
2066 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2067 curl_easy_strerror(c));
2068 if (slot->http_code >= 300)
2069 return size;
2070 }
2071
2072 do {
2073 ssize_t retval = xwrite(freq->localfile,
2074 (char *) ptr + posn, size - posn);
2075 if (retval < 0)
2076 return posn;
2077 posn += retval;
2078 } while (posn < size);
2079
2080 freq->stream.avail_in = size;
2081 freq->stream.next_in = (void *)ptr;
2082 do {
2083 freq->stream.next_out = expn;
2084 freq->stream.avail_out = sizeof(expn);
2085 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2086 git_SHA1_Update(&freq->c, expn,
2087 sizeof(expn) - freq->stream.avail_out);
2088 } while (freq->stream.avail_in && freq->zret == Z_OK);
2089 return size;
2090 }
2091
2092 struct http_object_request *new_http_object_request(const char *base_url,
2093 unsigned char *sha1)
2094 {
2095 char *hex = sha1_to_hex(sha1);
2096 const char *filename;
2097 char prevfile[PATH_MAX];
2098 int prevlocal;
2099 char prev_buf[PREV_BUF_SIZE];
2100 ssize_t prev_read = 0;
2101 off_t prev_posn = 0;
2102 struct http_object_request *freq;
2103
2104 freq = xcalloc(1, sizeof(*freq));
2105 hashcpy(freq->sha1, sha1);
2106 freq->localfile = -1;
2107
2108 filename = sha1_file_name(sha1);
2109 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2110 "%s.temp", filename);
2111
2112 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2113 unlink_or_warn(prevfile);
2114 rename(freq->tmpfile, prevfile);
2115 unlink_or_warn(freq->tmpfile);
2116
2117 if (freq->localfile != -1)
2118 error("fd leakage in start: %d", freq->localfile);
2119 freq->localfile = open(freq->tmpfile,
2120 O_WRONLY | O_CREAT | O_EXCL, 0666);
2121 /*
2122 * This could have failed due to the "lazy directory creation";
2123 * try to mkdir the last path component.
2124 */
2125 if (freq->localfile < 0 && errno == ENOENT) {
2126 char *dir = strrchr(freq->tmpfile, '/');
2127 if (dir) {
2128 *dir = 0;
2129 mkdir(freq->tmpfile, 0777);
2130 *dir = '/';
2131 }
2132 freq->localfile = open(freq->tmpfile,
2133 O_WRONLY | O_CREAT | O_EXCL, 0666);
2134 }
2135
2136 if (freq->localfile < 0) {
2137 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2138 goto abort;
2139 }
2140
2141 git_inflate_init(&freq->stream);
2142
2143 git_SHA1_Init(&freq->c);
2144
2145 freq->url = get_remote_object_url(base_url, hex, 0);
2146
2147 /*
2148 * If a previous temp file is present, process what was already
2149 * fetched.
2150 */
2151 prevlocal = open(prevfile, O_RDONLY);
2152 if (prevlocal != -1) {
2153 do {
2154 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2155 if (prev_read>0) {
2156 if (fwrite_sha1_file(prev_buf,
2157 1,
2158 prev_read,
2159 freq) == prev_read) {
2160 prev_posn += prev_read;
2161 } else {
2162 prev_read = -1;
2163 }
2164 }
2165 } while (prev_read > 0);
2166 close(prevlocal);
2167 }
2168 unlink_or_warn(prevfile);
2169
2170 /*
2171 * Reset inflate/SHA1 if there was an error reading the previous temp
2172 * file; also rewind to the beginning of the local file.
2173 */
2174 if (prev_read == -1) {
2175 memset(&freq->stream, 0, sizeof(freq->stream));
2176 git_inflate_init(&freq->stream);
2177 git_SHA1_Init(&freq->c);
2178 if (prev_posn>0) {
2179 prev_posn = 0;
2180 lseek(freq->localfile, 0, SEEK_SET);
2181 if (ftruncate(freq->localfile, 0) < 0) {
2182 error_errno("Couldn't truncate temporary file %s",
2183 freq->tmpfile);
2184 goto abort;
2185 }
2186 }
2187 }
2188
2189 freq->slot = get_active_slot();
2190
2191 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2192 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2193 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2194 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2195 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2196 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2197
2198 /*
2199 * If we have successfully processed data from a previous fetch
2200 * attempt, only fetch the data we don't already have.
2201 */
2202 if (prev_posn>0) {
2203 if (http_is_verbose)
2204 fprintf(stderr,
2205 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2206 hex, (uintmax_t)prev_posn);
2207 http_opt_request_remainder(freq->slot->curl, prev_posn);
2208 }
2209
2210 return freq;
2211
2212 abort:
2213 free(freq->url);
2214 free(freq);
2215 return NULL;
2216 }
2217
2218 void process_http_object_request(struct http_object_request *freq)
2219 {
2220 if (freq->slot == NULL)
2221 return;
2222 freq->curl_result = freq->slot->curl_result;
2223 freq->http_code = freq->slot->http_code;
2224 freq->slot = NULL;
2225 }
2226
2227 int finish_http_object_request(struct http_object_request *freq)
2228 {
2229 struct stat st;
2230
2231 close(freq->localfile);
2232 freq->localfile = -1;
2233
2234 process_http_object_request(freq);
2235
2236 if (freq->http_code == 416) {
2237 warning("requested range invalid; we may already have all the data.");
2238 } else if (freq->curl_result != CURLE_OK) {
2239 if (stat(freq->tmpfile, &st) == 0)
2240 if (st.st_size == 0)
2241 unlink_or_warn(freq->tmpfile);
2242 return -1;
2243 }
2244
2245 git_inflate_end(&freq->stream);
2246 git_SHA1_Final(freq->real_sha1, &freq->c);
2247 if (freq->zret != Z_STREAM_END) {
2248 unlink_or_warn(freq->tmpfile);
2249 return -1;
2250 }
2251 if (hashcmp(freq->sha1, freq->real_sha1)) {
2252 unlink_or_warn(freq->tmpfile);
2253 return -1;
2254 }
2255 freq->rename =
2256 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2257
2258 return freq->rename;
2259 }
2260
2261 void abort_http_object_request(struct http_object_request *freq)
2262 {
2263 unlink_or_warn(freq->tmpfile);
2264
2265 release_http_object_request(freq);
2266 }
2267
2268 void release_http_object_request(struct http_object_request *freq)
2269 {
2270 if (freq->localfile != -1) {
2271 close(freq->localfile);
2272 freq->localfile = -1;
2273 }
2274 if (freq->url != NULL) {
2275 free(freq->url);
2276 freq->url = NULL;
2277 }
2278 if (freq->slot != NULL) {
2279 freq->slot->callback_func = NULL;
2280 freq->slot->callback_data = NULL;
2281 release_active_slot(freq->slot);
2282 freq->slot = NULL;
2283 }
2284 }
ramsay's fork of git