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Merge branch 'rs/fsck-null-return-from-lookup' into maint
[alt-git.git] / http.c
blob76ff63c14d44057f78b532fb9d873c94ae56231e
1 #include "git-compat-util.h"
2 #include "http.h"
3 #include "config.h"
4 #include "pack.h"
5 #include "sideband.h"
6 #include "run-command.h"
7 #include "url.h"
8 #include "urlmatch.h"
9 #include "credential.h"
10 #include "version.h"
11 #include "pkt-line.h"
12 #include "gettext.h"
13 #include "transport.h"
14
15 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
16 #if LIBCURL_VERSION_NUM >= 0x070a08
17 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
18 #else
19 long int git_curl_ipresolve;
20 #endif
21 int active_requests;
22 int http_is_verbose;
23 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
24
25 #if LIBCURL_VERSION_NUM >= 0x070a06
26 #define LIBCURL_CAN_HANDLE_AUTH_ANY
27 #endif
28
29 static int min_curl_sessions = 1;
30 static int curl_session_count;
31 #ifdef USE_CURL_MULTI
32 static int max_requests = -1;
33 static CURLM *curlm;
34 #endif
35 #ifndef NO_CURL_EASY_DUPHANDLE
36 static CURL *curl_default;
37 #endif
38
39 #define PREV_BUF_SIZE 4096
40
41 char curl_errorstr[CURL_ERROR_SIZE];
42
43 static int curl_ssl_verify = -1;
44 static int curl_ssl_try;
45 static const char *ssl_cert;
46 static const char *ssl_cipherlist;
47 static const char *ssl_version;
48 static struct {
49 const char *name;
50 long ssl_version;
51 } sslversions[] = {
52 { "sslv2", CURL_SSLVERSION_SSLv2 },
53 { "sslv3", CURL_SSLVERSION_SSLv3 },
54 { "tlsv1", CURL_SSLVERSION_TLSv1 },
55 #if LIBCURL_VERSION_NUM >= 0x072200
56 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
57 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
58 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
59 #endif
60 };
61 #if LIBCURL_VERSION_NUM >= 0x070903
62 static const char *ssl_key;
63 #endif
64 #if LIBCURL_VERSION_NUM >= 0x070908
65 static const char *ssl_capath;
66 #endif
67 #if LIBCURL_VERSION_NUM >= 0x072c00
68 static const char *ssl_pinnedkey;
69 #endif
70 static const char *ssl_cainfo;
71 static long curl_low_speed_limit = -1;
72 static long curl_low_speed_time = -1;
73 static int curl_ftp_no_epsv;
74 static const char *curl_http_proxy;
75 static const char *curl_no_proxy;
76 static const char *http_proxy_authmethod;
77 static struct {
78 const char *name;
79 long curlauth_param;
80 } proxy_authmethods[] = {
81 { "basic", CURLAUTH_BASIC },
82 { "digest", CURLAUTH_DIGEST },
83 { "negotiate", CURLAUTH_GSSNEGOTIATE },
84 { "ntlm", CURLAUTH_NTLM },
85 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
86 { "anyauth", CURLAUTH_ANY },
87 #endif
88 /*
89 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
90 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
91 * here, too
92 */
93 };
94 #if LIBCURL_VERSION_NUM >= 0x071600
95 static const char *curl_deleg;
96 static struct {
97 const char *name;
98 long curl_deleg_param;
99 } curl_deleg_levels[] = {
100 { "none", CURLGSSAPI_DELEGATION_NONE },
101 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
102 { "always", CURLGSSAPI_DELEGATION_FLAG },
103 };
104 #endif
105
106 static struct credential proxy_auth = CREDENTIAL_INIT;
107 static const char *curl_proxyuserpwd;
108 static const char *curl_cookie_file;
109 static int curl_save_cookies;
110 struct credential http_auth = CREDENTIAL_INIT;
111 static int http_proactive_auth;
112 static const char *user_agent;
113 static int curl_empty_auth = -1;
114
115 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
116
117 #if LIBCURL_VERSION_NUM >= 0x071700
118 /* Use CURLOPT_KEYPASSWD as is */
119 #elif LIBCURL_VERSION_NUM >= 0x070903
120 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
121 #else
122 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
123 #endif
124
125 static struct credential cert_auth = CREDENTIAL_INIT;
126 static int ssl_cert_password_required;
127 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
128 static unsigned long http_auth_methods = CURLAUTH_ANY;
129 static int http_auth_methods_restricted;
130 /* Modes for which empty_auth cannot actually help us. */
131 static unsigned long empty_auth_useless =
132 CURLAUTH_BASIC
133 #ifdef CURLAUTH_DIGEST_IE
134 | CURLAUTH_DIGEST_IE
135 #endif
136 | CURLAUTH_DIGEST;
137 #endif
138
139 static struct curl_slist *pragma_header;
140 static struct curl_slist *no_pragma_header;
141 static struct curl_slist *extra_http_headers;
142
143 static struct active_request_slot *active_queue_head;
144
145 static char *cached_accept_language;
146
147 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
148 {
149 size_t size = eltsize * nmemb;
150 struct buffer *buffer = buffer_;
151
152 if (size > buffer->buf.len - buffer->posn)
153 size = buffer->buf.len - buffer->posn;
154 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
155 buffer->posn += size;
156
157 return size;
158 }
159
160 #ifndef NO_CURL_IOCTL
161 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
162 {
163 struct buffer *buffer = clientp;
164
165 switch (cmd) {
166 case CURLIOCMD_NOP:
167 return CURLIOE_OK;
168
169 case CURLIOCMD_RESTARTREAD:
170 buffer->posn = 0;
171 return CURLIOE_OK;
172
173 default:
174 return CURLIOE_UNKNOWNCMD;
175 }
176 }
177 #endif
178
179 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
180 {
181 size_t size = eltsize * nmemb;
182 struct strbuf *buffer = buffer_;
183
184 strbuf_add(buffer, ptr, size);
185 return size;
186 }
187
188 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
189 {
190 return eltsize * nmemb;
191 }
192
193 static void closedown_active_slot(struct active_request_slot *slot)
194 {
195 active_requests--;
196 slot->in_use = 0;
197 }
198
199 static void finish_active_slot(struct active_request_slot *slot)
200 {
201 closedown_active_slot(slot);
202 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
203
204 if (slot->finished != NULL)
205 (*slot->finished) = 1;
206
207 /* Store slot results so they can be read after the slot is reused */
208 if (slot->results != NULL) {
209 slot->results->curl_result = slot->curl_result;
210 slot->results->http_code = slot->http_code;
211 #if LIBCURL_VERSION_NUM >= 0x070a08
212 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
213 &slot->results->auth_avail);
214 #else
215 slot->results->auth_avail = 0;
216 #endif
217
218 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
219 &slot->results->http_connectcode);
220 }
221
222 /* Run callback if appropriate */
223 if (slot->callback_func != NULL)
224 slot->callback_func(slot->callback_data);
225 }
226
227 static void xmulti_remove_handle(struct active_request_slot *slot)
228 {
229 #ifdef USE_CURL_MULTI
230 curl_multi_remove_handle(curlm, slot->curl);
231 #endif
232 }
233
234 #ifdef USE_CURL_MULTI
235 static void process_curl_messages(void)
236 {
237 int num_messages;
238 struct active_request_slot *slot;
239 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
240
241 while (curl_message != NULL) {
242 if (curl_message->msg == CURLMSG_DONE) {
243 int curl_result = curl_message->data.result;
244 slot = active_queue_head;
245 while (slot != NULL &&
246 slot->curl != curl_message->easy_handle)
247 slot = slot->next;
248 if (slot != NULL) {
249 xmulti_remove_handle(slot);
250 slot->curl_result = curl_result;
251 finish_active_slot(slot);
252 } else {
253 fprintf(stderr, "Received DONE message for unknown request!\n");
254 }
255 } else {
256 fprintf(stderr, "Unknown CURL message received: %d\n",
257 (int)curl_message->msg);
258 }
259 curl_message = curl_multi_info_read(curlm, &num_messages);
260 }
261 }
262 #endif
263
264 static int http_options(const char *var, const char *value, void *cb)
265 {
266 if (!strcmp("http.sslverify", var)) {
267 curl_ssl_verify = git_config_bool(var, value);
268 return 0;
269 }
270 if (!strcmp("http.sslcipherlist", var))
271 return git_config_string(&ssl_cipherlist, var, value);
272 if (!strcmp("http.sslversion", var))
273 return git_config_string(&ssl_version, var, value);
274 if (!strcmp("http.sslcert", var))
275 return git_config_pathname(&ssl_cert, var, value);
276 #if LIBCURL_VERSION_NUM >= 0x070903
277 if (!strcmp("http.sslkey", var))
278 return git_config_pathname(&ssl_key, var, value);
279 #endif
280 #if LIBCURL_VERSION_NUM >= 0x070908
281 if (!strcmp("http.sslcapath", var))
282 return git_config_pathname(&ssl_capath, var, value);
283 #endif
284 if (!strcmp("http.sslcainfo", var))
285 return git_config_pathname(&ssl_cainfo, var, value);
286 if (!strcmp("http.sslcertpasswordprotected", var)) {
287 ssl_cert_password_required = git_config_bool(var, value);
288 return 0;
289 }
290 if (!strcmp("http.ssltry", var)) {
291 curl_ssl_try = git_config_bool(var, value);
292 return 0;
293 }
294 if (!strcmp("http.minsessions", var)) {
295 min_curl_sessions = git_config_int(var, value);
296 #ifndef USE_CURL_MULTI
297 if (min_curl_sessions > 1)
298 min_curl_sessions = 1;
299 #endif
300 return 0;
301 }
302 #ifdef USE_CURL_MULTI
303 if (!strcmp("http.maxrequests", var)) {
304 max_requests = git_config_int(var, value);
305 return 0;
306 }
307 #endif
308 if (!strcmp("http.lowspeedlimit", var)) {
309 curl_low_speed_limit = (long)git_config_int(var, value);
310 return 0;
311 }
312 if (!strcmp("http.lowspeedtime", var)) {
313 curl_low_speed_time = (long)git_config_int(var, value);
314 return 0;
315 }
316
317 if (!strcmp("http.noepsv", var)) {
318 curl_ftp_no_epsv = git_config_bool(var, value);
319 return 0;
320 }
321 if (!strcmp("http.proxy", var))
322 return git_config_string(&curl_http_proxy, var, value);
323
324 if (!strcmp("http.proxyauthmethod", var))
325 return git_config_string(&http_proxy_authmethod, var, value);
326
327 if (!strcmp("http.cookiefile", var))
328 return git_config_pathname(&curl_cookie_file, var, value);
329 if (!strcmp("http.savecookies", var)) {
330 curl_save_cookies = git_config_bool(var, value);
331 return 0;
332 }
333
334 if (!strcmp("http.postbuffer", var)) {
335 http_post_buffer = git_config_ssize_t(var, value);
336 if (http_post_buffer < 0)
337 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
338 if (http_post_buffer < LARGE_PACKET_MAX)
339 http_post_buffer = LARGE_PACKET_MAX;
340 return 0;
341 }
342
343 if (!strcmp("http.useragent", var))
344 return git_config_string(&user_agent, var, value);
345
346 if (!strcmp("http.emptyauth", var)) {
347 if (value && !strcmp("auto", value))
348 curl_empty_auth = -1;
349 else
350 curl_empty_auth = git_config_bool(var, value);
351 return 0;
352 }
353
354 if (!strcmp("http.delegation", var)) {
355 #if LIBCURL_VERSION_NUM >= 0x071600
356 return git_config_string(&curl_deleg, var, value);
357 #else
358 warning(_("Delegation control is not supported with cURL < 7.22.0"));
359 return 0;
360 #endif
361 }
362
363 if (!strcmp("http.pinnedpubkey", var)) {
364 #if LIBCURL_VERSION_NUM >= 0x072c00
365 return git_config_pathname(&ssl_pinnedkey, var, value);
366 #else
367 warning(_("Public key pinning not supported with cURL < 7.44.0"));
368 return 0;
369 #endif
370 }
371
372 if (!strcmp("http.extraheader", var)) {
373 if (!value) {
374 return config_error_nonbool(var);
375 } else if (!*value) {
376 curl_slist_free_all(extra_http_headers);
377 extra_http_headers = NULL;
378 } else {
379 extra_http_headers =
380 curl_slist_append(extra_http_headers, value);
381 }
382 return 0;
383 }
384
385 if (!strcmp("http.followredirects", var)) {
386 if (value && !strcmp(value, "initial"))
387 http_follow_config = HTTP_FOLLOW_INITIAL;
388 else if (git_config_bool(var, value))
389 http_follow_config = HTTP_FOLLOW_ALWAYS;
390 else
391 http_follow_config = HTTP_FOLLOW_NONE;
392 return 0;
393 }
394
395 /* Fall back on the default ones */
396 return git_default_config(var, value, cb);
397 }
398
399 static int curl_empty_auth_enabled(void)
400 {
401 if (curl_empty_auth >= 0)
402 return curl_empty_auth;
403
404 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
405 /*
406 * Our libcurl is too old to do AUTH_ANY in the first place;
407 * just default to turning the feature off.
408 */
409 #else
410 /*
411 * In the automatic case, kick in the empty-auth
412 * hack as long as we would potentially try some
413 * method more exotic than "Basic" or "Digest".
414 *
415 * But only do this when this is our second or
416 * subsequent request, as by then we know what
417 * methods are available.
418 */
419 if (http_auth_methods_restricted &&
420 (http_auth_methods & ~empty_auth_useless))
421 return 1;
422 #endif
423 return 0;
424 }
425
426 static void init_curl_http_auth(CURL *result)
427 {
428 if (!http_auth.username || !*http_auth.username) {
429 if (curl_empty_auth_enabled())
430 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
431 return;
432 }
433
434 credential_fill(&http_auth);
435
436 #if LIBCURL_VERSION_NUM >= 0x071301
437 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
438 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
439 #else
440 {
441 static struct strbuf up = STRBUF_INIT;
442 /*
443 * Note that we assume we only ever have a single set of
444 * credentials in a given program run, so we do not have
445 * to worry about updating this buffer, only setting its
446 * initial value.
447 */
448 if (!up.len)
449 strbuf_addf(&up, "%s:%s",
450 http_auth.username, http_auth.password);
451 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
452 }
453 #endif
454 }
455
456 /* *var must be free-able */
457 static void var_override(const char **var, char *value)
458 {
459 if (value) {
460 free((void *)*var);
461 *var = xstrdup(value);
462 }
463 }
464
465 static void set_proxyauth_name_password(CURL *result)
466 {
467 #if LIBCURL_VERSION_NUM >= 0x071301
468 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
469 proxy_auth.username);
470 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
471 proxy_auth.password);
472 #else
473 struct strbuf s = STRBUF_INIT;
474
475 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
476 strbuf_addch(&s, ':');
477 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
478 curl_proxyuserpwd = strbuf_detach(&s, NULL);
479 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
480 #endif
481 }
482
483 static void init_curl_proxy_auth(CURL *result)
484 {
485 if (proxy_auth.username) {
486 if (!proxy_auth.password)
487 credential_fill(&proxy_auth);
488 set_proxyauth_name_password(result);
489 }
490
491 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
492
493 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
494 if (http_proxy_authmethod) {
495 int i;
496 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
497 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
498 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
499 proxy_authmethods[i].curlauth_param);
500 break;
501 }
502 }
503 if (i == ARRAY_SIZE(proxy_authmethods)) {
504 warning("unsupported proxy authentication method %s: using anyauth",
505 http_proxy_authmethod);
506 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
507 }
508 }
509 else
510 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
511 #endif
512 }
513
514 static int has_cert_password(void)
515 {
516 if (ssl_cert == NULL || ssl_cert_password_required != 1)
517 return 0;
518 if (!cert_auth.password) {
519 cert_auth.protocol = xstrdup("cert");
520 cert_auth.username = xstrdup("");
521 cert_auth.path = xstrdup(ssl_cert);
522 credential_fill(&cert_auth);
523 }
524 return 1;
525 }
526
527 #if LIBCURL_VERSION_NUM >= 0x071900
528 static void set_curl_keepalive(CURL *c)
529 {
530 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
531 }
532
533 #elif LIBCURL_VERSION_NUM >= 0x071000
534 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
535 {
536 int ka = 1;
537 int rc;
538 socklen_t len = (socklen_t)sizeof(ka);
539
540 if (type != CURLSOCKTYPE_IPCXN)
541 return 0;
542
543 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
544 if (rc < 0)
545 warning_errno("unable to set SO_KEEPALIVE on socket");
546
547 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
548 }
549
550 static void set_curl_keepalive(CURL *c)
551 {
552 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
553 }
554
555 #else
556 static void set_curl_keepalive(CURL *c)
557 {
558 /* not supported on older curl versions */
559 }
560 #endif
561
562 static void redact_sensitive_header(struct strbuf *header)
563 {
564 const char *sensitive_header;
565
566 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
567 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
568 /* The first token is the type, which is OK to log */
569 while (isspace(*sensitive_header))
570 sensitive_header++;
571 while (*sensitive_header && !isspace(*sensitive_header))
572 sensitive_header++;
573 /* Everything else is opaque and possibly sensitive */
574 strbuf_setlen(header, sensitive_header - header->buf);
575 strbuf_addstr(header, " <redacted>");
576 }
577 }
578
579 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
580 {
581 struct strbuf out = STRBUF_INIT;
582 struct strbuf **headers, **header;
583
584 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
585 text, (long)size, (long)size);
586 trace_strbuf(&trace_curl, &out);
587 strbuf_reset(&out);
588 strbuf_add(&out, ptr, size);
589 headers = strbuf_split_max(&out, '\n', 0);
590
591 for (header = headers; *header; header++) {
592 if (hide_sensitive_header)
593 redact_sensitive_header(*header);
594 strbuf_insert((*header), 0, text, strlen(text));
595 strbuf_insert((*header), strlen(text), ": ", 2);
596 strbuf_rtrim((*header));
597 strbuf_addch((*header), '\n');
598 trace_strbuf(&trace_curl, (*header));
599 }
600 strbuf_list_free(headers);
601 strbuf_release(&out);
602 }
603
604 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
605 {
606 size_t i;
607 struct strbuf out = STRBUF_INIT;
608 unsigned int width = 60;
609
610 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
611 text, (long)size, (long)size);
612 trace_strbuf(&trace_curl, &out);
613
614 for (i = 0; i < size; i += width) {
615 size_t w;
616
617 strbuf_reset(&out);
618 strbuf_addf(&out, "%s: ", text);
619 for (w = 0; (w < width) && (i + w < size); w++) {
620 unsigned char ch = ptr[i + w];
621
622 strbuf_addch(&out,
623 (ch >= 0x20) && (ch < 0x80)
624 ? ch : '.');
625 }
626 strbuf_addch(&out, '\n');
627 trace_strbuf(&trace_curl, &out);
628 }
629 strbuf_release(&out);
630 }
631
632 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
633 {
634 const char *text;
635 enum { NO_FILTER = 0, DO_FILTER = 1 };
636
637 switch (type) {
638 case CURLINFO_TEXT:
639 trace_printf_key(&trace_curl, "== Info: %s", data);
640 default: /* we ignore unknown types by default */
641 return 0;
642
643 case CURLINFO_HEADER_OUT:
644 text = "=> Send header";
645 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
646 break;
647 case CURLINFO_DATA_OUT:
648 text = "=> Send data";
649 curl_dump_data(text, (unsigned char *)data, size);
650 break;
651 case CURLINFO_SSL_DATA_OUT:
652 text = "=> Send SSL data";
653 curl_dump_data(text, (unsigned char *)data, size);
654 break;
655 case CURLINFO_HEADER_IN:
656 text = "<= Recv header";
657 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
658 break;
659 case CURLINFO_DATA_IN:
660 text = "<= Recv data";
661 curl_dump_data(text, (unsigned char *)data, size);
662 break;
663 case CURLINFO_SSL_DATA_IN:
664 text = "<= Recv SSL data";
665 curl_dump_data(text, (unsigned char *)data, size);
666 break;
667 }
668 return 0;
669 }
670
671 void setup_curl_trace(CURL *handle)
672 {
673 if (!trace_want(&trace_curl))
674 return;
675 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
676 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
677 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
678 }
679
680 static long get_curl_allowed_protocols(int from_user)
681 {
682 long allowed_protocols = 0;
683
684 if (is_transport_allowed("http", from_user))
685 allowed_protocols |= CURLPROTO_HTTP;
686 if (is_transport_allowed("https", from_user))
687 allowed_protocols |= CURLPROTO_HTTPS;
688 if (is_transport_allowed("ftp", from_user))
689 allowed_protocols |= CURLPROTO_FTP;
690 if (is_transport_allowed("ftps", from_user))
691 allowed_protocols |= CURLPROTO_FTPS;
692
693 return allowed_protocols;
694 }
695
696 static CURL *get_curl_handle(void)
697 {
698 CURL *result = curl_easy_init();
699
700 if (!result)
701 die("curl_easy_init failed");
702
703 if (!curl_ssl_verify) {
704 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
705 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
706 } else {
707 /* Verify authenticity of the peer's certificate */
708 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
709 /* The name in the cert must match whom we tried to connect */
710 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
711 }
712
713 #if LIBCURL_VERSION_NUM >= 0x070907
714 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
715 #endif
716 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
717 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
718 #endif
719
720 #if LIBCURL_VERSION_NUM >= 0x071600
721 if (curl_deleg) {
722 int i;
723 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
724 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
725 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
726 curl_deleg_levels[i].curl_deleg_param);
727 break;
728 }
729 }
730 if (i == ARRAY_SIZE(curl_deleg_levels))
731 warning("Unknown delegation method '%s': using default",
732 curl_deleg);
733 }
734 #endif
735
736 if (http_proactive_auth)
737 init_curl_http_auth(result);
738
739 if (getenv("GIT_SSL_VERSION"))
740 ssl_version = getenv("GIT_SSL_VERSION");
741 if (ssl_version && *ssl_version) {
742 int i;
743 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
744 if (!strcmp(ssl_version, sslversions[i].name)) {
745 curl_easy_setopt(result, CURLOPT_SSLVERSION,
746 sslversions[i].ssl_version);
747 break;
748 }
749 }
750 if (i == ARRAY_SIZE(sslversions))
751 warning("unsupported ssl version %s: using default",
752 ssl_version);
753 }
754
755 if (getenv("GIT_SSL_CIPHER_LIST"))
756 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
757 if (ssl_cipherlist != NULL && *ssl_cipherlist)
758 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
759 ssl_cipherlist);
760
761 if (ssl_cert != NULL)
762 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
763 if (has_cert_password())
764 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
765 #if LIBCURL_VERSION_NUM >= 0x070903
766 if (ssl_key != NULL)
767 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
768 #endif
769 #if LIBCURL_VERSION_NUM >= 0x070908
770 if (ssl_capath != NULL)
771 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
772 #endif
773 #if LIBCURL_VERSION_NUM >= 0x072c00
774 if (ssl_pinnedkey != NULL)
775 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
776 #endif
777 if (ssl_cainfo != NULL)
778 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
779
780 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
781 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
782 curl_low_speed_limit);
783 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
784 curl_low_speed_time);
785 }
786
787 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
788 #if LIBCURL_VERSION_NUM >= 0x071301
789 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
790 #elif LIBCURL_VERSION_NUM >= 0x071101
791 curl_easy_setopt(result, CURLOPT_POST301, 1);
792 #endif
793 #if LIBCURL_VERSION_NUM >= 0x071304
794 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
795 get_curl_allowed_protocols(0));
796 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
797 get_curl_allowed_protocols(-1));
798 #else
799 warning("protocol restrictions not applied to curl redirects because\n"
800 "your curl version is too old (>= 7.19.4)");
801 #endif
802 if (getenv("GIT_CURL_VERBOSE"))
803 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
804 setup_curl_trace(result);
805
806 curl_easy_setopt(result, CURLOPT_USERAGENT,
807 user_agent ? user_agent : git_user_agent());
808
809 if (curl_ftp_no_epsv)
810 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
811
812 #ifdef CURLOPT_USE_SSL
813 if (curl_ssl_try)
814 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
815 #endif
816
817 /*
818 * CURL also examines these variables as a fallback; but we need to query
819 * them here in order to decide whether to prompt for missing password (cf.
820 * init_curl_proxy_auth()).
821 *
822 * Unlike many other common environment variables, these are historically
823 * lowercase only. It appears that CURL did not know this and implemented
824 * only uppercase variants, which was later corrected to take both - with
825 * the exception of http_proxy, which is lowercase only also in CURL. As
826 * the lowercase versions are the historical quasi-standard, they take
827 * precedence here, as in CURL.
828 */
829 if (!curl_http_proxy) {
830 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
831 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
832 var_override(&curl_http_proxy, getenv("https_proxy"));
833 } else {
834 var_override(&curl_http_proxy, getenv("http_proxy"));
835 }
836 if (!curl_http_proxy) {
837 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
838 var_override(&curl_http_proxy, getenv("all_proxy"));
839 }
840 }
841
842 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
843 /*
844 * Handle case with the empty http.proxy value here to keep
845 * common code clean.
846 * NB: empty option disables proxying at all.
847 */
848 curl_easy_setopt(result, CURLOPT_PROXY, "");
849 } else if (curl_http_proxy) {
850 #if LIBCURL_VERSION_NUM >= 0x071800
851 if (starts_with(curl_http_proxy, "socks5h"))
852 curl_easy_setopt(result,
853 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
854 else if (starts_with(curl_http_proxy, "socks5"))
855 curl_easy_setopt(result,
856 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
857 else if (starts_with(curl_http_proxy, "socks4a"))
858 curl_easy_setopt(result,
859 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
860 else if (starts_with(curl_http_proxy, "socks"))
861 curl_easy_setopt(result,
862 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
863 #endif
864 if (strstr(curl_http_proxy, "://"))
865 credential_from_url(&proxy_auth, curl_http_proxy);
866 else {
867 struct strbuf url = STRBUF_INIT;
868 strbuf_addf(&url, "http://%s", curl_http_proxy);
869 credential_from_url(&proxy_auth, url.buf);
870 strbuf_release(&url);
871 }
872
873 if (!proxy_auth.host)
874 die("Invalid proxy URL '%s'", curl_http_proxy);
875
876 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
877 #if LIBCURL_VERSION_NUM >= 0x071304
878 var_override(&curl_no_proxy, getenv("NO_PROXY"));
879 var_override(&curl_no_proxy, getenv("no_proxy"));
880 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
881 #endif
882 }
883 init_curl_proxy_auth(result);
884
885 set_curl_keepalive(result);
886
887 return result;
888 }
889
890 static void set_from_env(const char **var, const char *envname)
891 {
892 const char *val = getenv(envname);
893 if (val)
894 *var = val;
895 }
896
897 void http_init(struct remote *remote, const char *url, int proactive_auth)
898 {
899 char *low_speed_limit;
900 char *low_speed_time;
901 char *normalized_url;
902 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
903
904 config.section = "http";
905 config.key = NULL;
906 config.collect_fn = http_options;
907 config.cascade_fn = git_default_config;
908 config.cb = NULL;
909
910 http_is_verbose = 0;
911 normalized_url = url_normalize(url, &config.url);
912
913 git_config(urlmatch_config_entry, &config);
914 free(normalized_url);
915
916 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
917 die("curl_global_init failed");
918
919 http_proactive_auth = proactive_auth;
920
921 if (remote && remote->http_proxy)
922 curl_http_proxy = xstrdup(remote->http_proxy);
923
924 if (remote)
925 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
926
927 pragma_header = curl_slist_append(http_copy_default_headers(),
928 "Pragma: no-cache");
929 no_pragma_header = curl_slist_append(http_copy_default_headers(),
930 "Pragma:");
931
932 #ifdef USE_CURL_MULTI
933 {
934 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
935 if (http_max_requests != NULL)
936 max_requests = atoi(http_max_requests);
937 }
938
939 curlm = curl_multi_init();
940 if (!curlm)
941 die("curl_multi_init failed");
942 #endif
943
944 if (getenv("GIT_SSL_NO_VERIFY"))
945 curl_ssl_verify = 0;
946
947 set_from_env(&ssl_cert, "GIT_SSL_CERT");
948 #if LIBCURL_VERSION_NUM >= 0x070903
949 set_from_env(&ssl_key, "GIT_SSL_KEY");
950 #endif
951 #if LIBCURL_VERSION_NUM >= 0x070908
952 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
953 #endif
954 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
955
956 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
957
958 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
959 if (low_speed_limit != NULL)
960 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
961 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
962 if (low_speed_time != NULL)
963 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
964
965 if (curl_ssl_verify == -1)
966 curl_ssl_verify = 1;
967
968 curl_session_count = 0;
969 #ifdef USE_CURL_MULTI
970 if (max_requests < 1)
971 max_requests = DEFAULT_MAX_REQUESTS;
972 #endif
973
974 if (getenv("GIT_CURL_FTP_NO_EPSV"))
975 curl_ftp_no_epsv = 1;
976
977 if (url) {
978 credential_from_url(&http_auth, url);
979 if (!ssl_cert_password_required &&
980 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
981 starts_with(url, "https://"))
982 ssl_cert_password_required = 1;
983 }
984
985 #ifndef NO_CURL_EASY_DUPHANDLE
986 curl_default = get_curl_handle();
987 #endif
988 }
989
990 void http_cleanup(void)
991 {
992 struct active_request_slot *slot = active_queue_head;
993
994 while (slot != NULL) {
995 struct active_request_slot *next = slot->next;
996 if (slot->curl != NULL) {
997 xmulti_remove_handle(slot);
998 curl_easy_cleanup(slot->curl);
999 }
1000 free(slot);
1001 slot = next;
1002 }
1003 active_queue_head = NULL;
1004
1005 #ifndef NO_CURL_EASY_DUPHANDLE
1006 curl_easy_cleanup(curl_default);
1007 #endif
1008
1009 #ifdef USE_CURL_MULTI
1010 curl_multi_cleanup(curlm);
1011 #endif
1012 curl_global_cleanup();
1013
1014 curl_slist_free_all(extra_http_headers);
1015 extra_http_headers = NULL;
1016
1017 curl_slist_free_all(pragma_header);
1018 pragma_header = NULL;
1019
1020 curl_slist_free_all(no_pragma_header);
1021 no_pragma_header = NULL;
1022
1023 if (curl_http_proxy) {
1024 free((void *)curl_http_proxy);
1025 curl_http_proxy = NULL;
1026 }
1027
1028 if (proxy_auth.password) {
1029 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1030 FREE_AND_NULL(proxy_auth.password);
1031 }
1032
1033 free((void *)curl_proxyuserpwd);
1034 curl_proxyuserpwd = NULL;
1035
1036 free((void *)http_proxy_authmethod);
1037 http_proxy_authmethod = NULL;
1038
1039 if (cert_auth.password != NULL) {
1040 memset(cert_auth.password, 0, strlen(cert_auth.password));
1041 FREE_AND_NULL(cert_auth.password);
1042 }
1043 ssl_cert_password_required = 0;
1044
1045 FREE_AND_NULL(cached_accept_language);
1046 }
1047
1048 struct active_request_slot *get_active_slot(void)
1049 {
1050 struct active_request_slot *slot = active_queue_head;
1051 struct active_request_slot *newslot;
1052
1053 #ifdef USE_CURL_MULTI
1054 int num_transfers;
1055
1056 /* Wait for a slot to open up if the queue is full */
1057 while (active_requests >= max_requests) {
1058 curl_multi_perform(curlm, &num_transfers);
1059 if (num_transfers < active_requests)
1060 process_curl_messages();
1061 }
1062 #endif
1063
1064 while (slot != NULL && slot->in_use)
1065 slot = slot->next;
1066
1067 if (slot == NULL) {
1068 newslot = xmalloc(sizeof(*newslot));
1069 newslot->curl = NULL;
1070 newslot->in_use = 0;
1071 newslot->next = NULL;
1072
1073 slot = active_queue_head;
1074 if (slot == NULL) {
1075 active_queue_head = newslot;
1076 } else {
1077 while (slot->next != NULL)
1078 slot = slot->next;
1079 slot->next = newslot;
1080 }
1081 slot = newslot;
1082 }
1083
1084 if (slot->curl == NULL) {
1085 #ifdef NO_CURL_EASY_DUPHANDLE
1086 slot->curl = get_curl_handle();
1087 #else
1088 slot->curl = curl_easy_duphandle(curl_default);
1089 #endif
1090 curl_session_count++;
1091 }
1092
1093 active_requests++;
1094 slot->in_use = 1;
1095 slot->results = NULL;
1096 slot->finished = NULL;
1097 slot->callback_data = NULL;
1098 slot->callback_func = NULL;
1099 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1100 if (curl_save_cookies)
1101 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1102 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1103 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1104 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1105 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1106 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1107 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1108 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1109 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1110 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1111 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1112
1113 /*
1114 * Default following to off unless "ALWAYS" is configured; this gives
1115 * callers a sane starting point, and they can tweak for individual
1116 * HTTP_FOLLOW_* cases themselves.
1117 */
1118 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1119 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1120 else
1121 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1122
1123 #if LIBCURL_VERSION_NUM >= 0x070a08
1124 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1125 #endif
1126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1127 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1128 #endif
1129 if (http_auth.password || curl_empty_auth_enabled())
1130 init_curl_http_auth(slot->curl);
1131
1132 return slot;
1133 }
1134
1135 int start_active_slot(struct active_request_slot *slot)
1136 {
1137 #ifdef USE_CURL_MULTI
1138 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1139 int num_transfers;
1140
1141 if (curlm_result != CURLM_OK &&
1142 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1143 warning("curl_multi_add_handle failed: %s",
1144 curl_multi_strerror(curlm_result));
1145 active_requests--;
1146 slot->in_use = 0;
1147 return 0;
1148 }
1149
1150 /*
1151 * We know there must be something to do, since we just added
1152 * something.
1153 */
1154 curl_multi_perform(curlm, &num_transfers);
1155 #endif
1156 return 1;
1157 }
1158
1159 #ifdef USE_CURL_MULTI
1160 struct fill_chain {
1161 void *data;
1162 int (*fill)(void *);
1163 struct fill_chain *next;
1164 };
1165
1166 static struct fill_chain *fill_cfg;
1167
1168 void add_fill_function(void *data, int (*fill)(void *))
1169 {
1170 struct fill_chain *new = xmalloc(sizeof(*new));
1171 struct fill_chain **linkp = &fill_cfg;
1172 new->data = data;
1173 new->fill = fill;
1174 new->next = NULL;
1175 while (*linkp)
1176 linkp = &(*linkp)->next;
1177 *linkp = new;
1178 }
1179
1180 void fill_active_slots(void)
1181 {
1182 struct active_request_slot *slot = active_queue_head;
1183
1184 while (active_requests < max_requests) {
1185 struct fill_chain *fill;
1186 for (fill = fill_cfg; fill; fill = fill->next)
1187 if (fill->fill(fill->data))
1188 break;
1189
1190 if (!fill)
1191 break;
1192 }
1193
1194 while (slot != NULL) {
1195 if (!slot->in_use && slot->curl != NULL
1196 && curl_session_count > min_curl_sessions) {
1197 curl_easy_cleanup(slot->curl);
1198 slot->curl = NULL;
1199 curl_session_count--;
1200 }
1201 slot = slot->next;
1202 }
1203 }
1204
1205 void step_active_slots(void)
1206 {
1207 int num_transfers;
1208 CURLMcode curlm_result;
1209
1210 do {
1211 curlm_result = curl_multi_perform(curlm, &num_transfers);
1212 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1213 if (num_transfers < active_requests) {
1214 process_curl_messages();
1215 fill_active_slots();
1216 }
1217 }
1218 #endif
1219
1220 void run_active_slot(struct active_request_slot *slot)
1221 {
1222 #ifdef USE_CURL_MULTI
1223 fd_set readfds;
1224 fd_set writefds;
1225 fd_set excfds;
1226 int max_fd;
1227 struct timeval select_timeout;
1228 int finished = 0;
1229
1230 slot->finished = &finished;
1231 while (!finished) {
1232 step_active_slots();
1233
1234 if (slot->in_use) {
1235 #if LIBCURL_VERSION_NUM >= 0x070f04
1236 long curl_timeout;
1237 curl_multi_timeout(curlm, &curl_timeout);
1238 if (curl_timeout == 0) {
1239 continue;
1240 } else if (curl_timeout == -1) {
1241 select_timeout.tv_sec = 0;
1242 select_timeout.tv_usec = 50000;
1243 } else {
1244 select_timeout.tv_sec = curl_timeout / 1000;
1245 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1246 }
1247 #else
1248 select_timeout.tv_sec = 0;
1249 select_timeout.tv_usec = 50000;
1250 #endif
1251
1252 max_fd = -1;
1253 FD_ZERO(&readfds);
1254 FD_ZERO(&writefds);
1255 FD_ZERO(&excfds);
1256 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1257
1258 /*
1259 * It can happen that curl_multi_timeout returns a pathologically
1260 * long timeout when curl_multi_fdset returns no file descriptors
1261 * to read. See commit message for more details.
1262 */
1263 if (max_fd < 0 &&
1264 (select_timeout.tv_sec > 0 ||
1265 select_timeout.tv_usec > 50000)) {
1266 select_timeout.tv_sec = 0;
1267 select_timeout.tv_usec = 50000;
1268 }
1269
1270 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1271 }
1272 }
1273 #else
1274 while (slot->in_use) {
1275 slot->curl_result = curl_easy_perform(slot->curl);
1276 finish_active_slot(slot);
1277 }
1278 #endif
1279 }
1280
1281 static void release_active_slot(struct active_request_slot *slot)
1282 {
1283 closedown_active_slot(slot);
1284 if (slot->curl) {
1285 xmulti_remove_handle(slot);
1286 if (curl_session_count > min_curl_sessions) {
1287 curl_easy_cleanup(slot->curl);
1288 slot->curl = NULL;
1289 curl_session_count--;
1290 }
1291 }
1292 #ifdef USE_CURL_MULTI
1293 fill_active_slots();
1294 #endif
1295 }
1296
1297 void finish_all_active_slots(void)
1298 {
1299 struct active_request_slot *slot = active_queue_head;
1300
1301 while (slot != NULL)
1302 if (slot->in_use) {
1303 run_active_slot(slot);
1304 slot = active_queue_head;
1305 } else {
1306 slot = slot->next;
1307 }
1308 }
1309
1310 /* Helpers for modifying and creating URLs */
1311 static inline int needs_quote(int ch)
1312 {
1313 if (((ch >= 'A') && (ch <= 'Z'))
1314 || ((ch >= 'a') && (ch <= 'z'))
1315 || ((ch >= '0') && (ch <= '9'))
1316 || (ch == '/')
1317 || (ch == '-')
1318 || (ch == '.'))
1319 return 0;
1320 return 1;
1321 }
1322
1323 static char *quote_ref_url(const char *base, const char *ref)
1324 {
1325 struct strbuf buf = STRBUF_INIT;
1326 const char *cp;
1327 int ch;
1328
1329 end_url_with_slash(&buf, base);
1330
1331 for (cp = ref; (ch = *cp) != 0; cp++)
1332 if (needs_quote(ch))
1333 strbuf_addf(&buf, "%%%02x", ch);
1334 else
1335 strbuf_addch(&buf, *cp);
1336
1337 return strbuf_detach(&buf, NULL);
1338 }
1339
1340 void append_remote_object_url(struct strbuf *buf, const char *url,
1341 const char *hex,
1342 int only_two_digit_prefix)
1343 {
1344 end_url_with_slash(buf, url);
1345
1346 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1347 if (!only_two_digit_prefix)
1348 strbuf_addstr(buf, hex + 2);
1349 }
1350
1351 char *get_remote_object_url(const char *url, const char *hex,
1352 int only_two_digit_prefix)
1353 {
1354 struct strbuf buf = STRBUF_INIT;
1355 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1356 return strbuf_detach(&buf, NULL);
1357 }
1358
1359 static int handle_curl_result(struct slot_results *results)
1360 {
1361 /*
1362 * If we see a failing http code with CURLE_OK, we have turned off
1363 * FAILONERROR (to keep the server's custom error response), and should
1364 * translate the code into failure here.
1365 *
1366 * Likewise, if we see a redirect (30x code), that means we turned off
1367 * redirect-following, and we should treat the result as an error.
1368 */
1369 if (results->curl_result == CURLE_OK &&
1370 results->http_code >= 300) {
1371 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1372 /*
1373 * Normally curl will already have put the "reason phrase"
1374 * from the server into curl_errorstr; unfortunately without
1375 * FAILONERROR it is lost, so we can give only the numeric
1376 * status code.
1377 */
1378 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1379 "The requested URL returned error: %ld",
1380 results->http_code);
1381 }
1382
1383 if (results->curl_result == CURLE_OK) {
1384 credential_approve(&http_auth);
1385 if (proxy_auth.password)
1386 credential_approve(&proxy_auth);
1387 return HTTP_OK;
1388 } else if (missing_target(results))
1389 return HTTP_MISSING_TARGET;
1390 else if (results->http_code == 401) {
1391 if (http_auth.username && http_auth.password) {
1392 credential_reject(&http_auth);
1393 return HTTP_NOAUTH;
1394 } else {
1395 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1396 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1397 if (results->auth_avail) {
1398 http_auth_methods &= results->auth_avail;
1399 http_auth_methods_restricted = 1;
1400 }
1401 #endif
1402 return HTTP_REAUTH;
1403 }
1404 } else {
1405 if (results->http_connectcode == 407)
1406 credential_reject(&proxy_auth);
1407 #if LIBCURL_VERSION_NUM >= 0x070c00
1408 if (!curl_errorstr[0])
1409 strlcpy(curl_errorstr,
1410 curl_easy_strerror(results->curl_result),
1411 sizeof(curl_errorstr));
1412 #endif
1413 return HTTP_ERROR;
1414 }
1415 }
1416
1417 int run_one_slot(struct active_request_slot *slot,
1418 struct slot_results *results)
1419 {
1420 slot->results = results;
1421 if (!start_active_slot(slot)) {
1422 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1423 "failed to start HTTP request");
1424 return HTTP_START_FAILED;
1425 }
1426
1427 run_active_slot(slot);
1428 return handle_curl_result(results);
1429 }
1430
1431 struct curl_slist *http_copy_default_headers(void)
1432 {
1433 struct curl_slist *headers = NULL, *h;
1434
1435 for (h = extra_http_headers; h; h = h->next)
1436 headers = curl_slist_append(headers, h->data);
1437
1438 return headers;
1439 }
1440
1441 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1442 {
1443 char *ptr;
1444 CURLcode ret;
1445
1446 strbuf_reset(buf);
1447 ret = curl_easy_getinfo(curl, info, &ptr);
1448 if (!ret && ptr)
1449 strbuf_addstr(buf, ptr);
1450 return ret;
1451 }
1452
1453 /*
1454 * Check for and extract a content-type parameter. "raw"
1455 * should be positioned at the start of the potential
1456 * parameter, with any whitespace already removed.
1457 *
1458 * "name" is the name of the parameter. The value is appended
1459 * to "out".
1460 */
1461 static int extract_param(const char *raw, const char *name,
1462 struct strbuf *out)
1463 {
1464 size_t len = strlen(name);
1465
1466 if (strncasecmp(raw, name, len))
1467 return -1;
1468 raw += len;
1469
1470 if (*raw != '=')
1471 return -1;
1472 raw++;
1473
1474 while (*raw && !isspace(*raw) && *raw != ';')
1475 strbuf_addch(out, *raw++);
1476 return 0;
1477 }
1478
1479 /*
1480 * Extract a normalized version of the content type, with any
1481 * spaces suppressed, all letters lowercased, and no trailing ";"
1482 * or parameters.
1483 *
1484 * Note that we will silently remove even invalid whitespace. For
1485 * example, "text / plain" is specifically forbidden by RFC 2616,
1486 * but "text/plain" is the only reasonable output, and this keeps
1487 * our code simple.
1488 *
1489 * If the "charset" argument is not NULL, store the value of any
1490 * charset parameter there.
1491 *
1492 * Example:
1493 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1494 * "text / plain" -> "text/plain"
1495 */
1496 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1497 struct strbuf *charset)
1498 {
1499 const char *p;
1500
1501 strbuf_reset(type);
1502 strbuf_grow(type, raw->len);
1503 for (p = raw->buf; *p; p++) {
1504 if (isspace(*p))
1505 continue;
1506 if (*p == ';') {
1507 p++;
1508 break;
1509 }
1510 strbuf_addch(type, tolower(*p));
1511 }
1512
1513 if (!charset)
1514 return;
1515
1516 strbuf_reset(charset);
1517 while (*p) {
1518 while (isspace(*p) || *p == ';')
1519 p++;
1520 if (!extract_param(p, "charset", charset))
1521 return;
1522 while (*p && !isspace(*p))
1523 p++;
1524 }
1525
1526 if (!charset->len && starts_with(type->buf, "text/"))
1527 strbuf_addstr(charset, "ISO-8859-1");
1528 }
1529
1530 static void write_accept_language(struct strbuf *buf)
1531 {
1532 /*
1533 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1534 * that, q-value will be smaller than 0.001, the minimum q-value the
1535 * HTTP specification allows. See
1536 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1537 */
1538 const int MAX_DECIMAL_PLACES = 3;
1539 const int MAX_LANGUAGE_TAGS = 1000;
1540 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1541 char **language_tags = NULL;
1542 int num_langs = 0;
1543 const char *s = get_preferred_languages();
1544 int i;
1545 struct strbuf tag = STRBUF_INIT;
1546
1547 /* Don't add Accept-Language header if no language is preferred. */
1548 if (!s)
1549 return;
1550
1551 /*
1552 * Split the colon-separated string of preferred languages into
1553 * language_tags array.
1554 */
1555 do {
1556 /* collect language tag */
1557 for (; *s && (isalnum(*s) || *s == '_'); s++)
1558 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1559
1560 /* skip .codeset, @modifier and any other unnecessary parts */
1561 while (*s && *s != ':')
1562 s++;
1563
1564 if (tag.len) {
1565 num_langs++;
1566 REALLOC_ARRAY(language_tags, num_langs);
1567 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1568 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1569 break;
1570 }
1571 } while (*s++);
1572
1573 /* write Accept-Language header into buf */
1574 if (num_langs) {
1575 int last_buf_len = 0;
1576 int max_q;
1577 int decimal_places;
1578 char q_format[32];
1579
1580 /* add '*' */
1581 REALLOC_ARRAY(language_tags, num_langs + 1);
1582 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1583
1584 /* compute decimal_places */
1585 for (max_q = 1, decimal_places = 0;
1586 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1587 decimal_places++, max_q *= 10)
1588 ;
1589
1590 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1591
1592 strbuf_addstr(buf, "Accept-Language: ");
1593
1594 for (i = 0; i < num_langs; i++) {
1595 if (i > 0)
1596 strbuf_addstr(buf, ", ");
1597
1598 strbuf_addstr(buf, language_tags[i]);
1599
1600 if (i > 0)
1601 strbuf_addf(buf, q_format, max_q - i);
1602
1603 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1604 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1605 break;
1606 }
1607
1608 last_buf_len = buf->len;
1609 }
1610 }
1611
1612 /* free language tags -- last one is a static '*' */
1613 for (i = 0; i < num_langs - 1; i++)
1614 free(language_tags[i]);
1615 free(language_tags);
1616 }
1617
1618 /*
1619 * Get an Accept-Language header which indicates user's preferred languages.
1620 *
1621 * Examples:
1622 * LANGUAGE= -> ""
1623 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1624 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1625 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1626 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1627 * LANGUAGE= LANG=C -> ""
1628 */
1629 static const char *get_accept_language(void)
1630 {
1631 if (!cached_accept_language) {
1632 struct strbuf buf = STRBUF_INIT;
1633 write_accept_language(&buf);
1634 if (buf.len > 0)
1635 cached_accept_language = strbuf_detach(&buf, NULL);
1636 }
1637
1638 return cached_accept_language;
1639 }
1640
1641 static void http_opt_request_remainder(CURL *curl, off_t pos)
1642 {
1643 char buf[128];
1644 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1645 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1646 }
1647
1648 /* http_request() targets */
1649 #define HTTP_REQUEST_STRBUF 0
1650 #define HTTP_REQUEST_FILE 1
1651
1652 static int http_request(const char *url,
1653 void *result, int target,
1654 const struct http_get_options *options)
1655 {
1656 struct active_request_slot *slot;
1657 struct slot_results results;
1658 struct curl_slist *headers = http_copy_default_headers();
1659 struct strbuf buf = STRBUF_INIT;
1660 const char *accept_language;
1661 int ret;
1662
1663 slot = get_active_slot();
1664 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1665
1666 if (result == NULL) {
1667 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1668 } else {
1669 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1670 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1671
1672 if (target == HTTP_REQUEST_FILE) {
1673 off_t posn = ftello(result);
1674 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1675 fwrite);
1676 if (posn > 0)
1677 http_opt_request_remainder(slot->curl, posn);
1678 } else
1679 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1680 fwrite_buffer);
1681 }
1682
1683 accept_language = get_accept_language();
1684
1685 if (accept_language)
1686 headers = curl_slist_append(headers, accept_language);
1687
1688 strbuf_addstr(&buf, "Pragma:");
1689 if (options && options->no_cache)
1690 strbuf_addstr(&buf, " no-cache");
1691 if (options && options->keep_error)
1692 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1693 if (options && options->initial_request &&
1694 http_follow_config == HTTP_FOLLOW_INITIAL)
1695 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1696
1697 headers = curl_slist_append(headers, buf.buf);
1698
1699 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1700 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1701 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1702
1703 ret = run_one_slot(slot, &results);
1704
1705 if (options && options->content_type) {
1706 struct strbuf raw = STRBUF_INIT;
1707 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1708 extract_content_type(&raw, options->content_type,
1709 options->charset);
1710 strbuf_release(&raw);
1711 }
1712
1713 if (options && options->effective_url)
1714 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1715 options->effective_url);
1716
1717 curl_slist_free_all(headers);
1718 strbuf_release(&buf);
1719
1720 return ret;
1721 }
1722
1723 /*
1724 * Update the "base" url to a more appropriate value, as deduced by
1725 * redirects seen when requesting a URL starting with "url".
1726 *
1727 * The "asked" parameter is a URL that we asked curl to access, and must begin
1728 * with "base".
1729 *
1730 * The "got" parameter is the URL that curl reported to us as where we ended
1731 * up.
1732 *
1733 * Returns 1 if we updated the base url, 0 otherwise.
1734 *
1735 * Our basic strategy is to compare "base" and "asked" to find the bits
1736 * specific to our request. We then strip those bits off of "got" to yield the
1737 * new base. So for example, if our base is "http://example.com/foo.git",
1738 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1739 * with "https://other.example.com/foo.git/info/refs". We would want the
1740 * new URL to become "https://other.example.com/foo.git".
1741 *
1742 * Note that this assumes a sane redirect scheme. It's entirely possible
1743 * in the example above to end up at a URL that does not even end in
1744 * "info/refs". In such a case we die. There's not much we can do, such a
1745 * scheme is unlikely to represent a real git repository, and failing to
1746 * rewrite the base opens options for malicious redirects to do funny things.
1747 */
1748 static int update_url_from_redirect(struct strbuf *base,
1749 const char *asked,
1750 const struct strbuf *got)
1751 {
1752 const char *tail;
1753 size_t new_len;
1754
1755 if (!strcmp(asked, got->buf))
1756 return 0;
1757
1758 if (!skip_prefix(asked, base->buf, &tail))
1759 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1760 asked, base->buf);
1761
1762 new_len = got->len;
1763 if (!strip_suffix_mem(got->buf, &new_len, tail))
1764 die(_("unable to update url base from redirection:\n"
1765 " asked for: %s\n"
1766 " redirect: %s"),
1767 asked, got->buf);
1768
1769 strbuf_reset(base);
1770 strbuf_add(base, got->buf, new_len);
1771
1772 return 1;
1773 }
1774
1775 static int http_request_reauth(const char *url,
1776 void *result, int target,
1777 struct http_get_options *options)
1778 {
1779 int ret = http_request(url, result, target, options);
1780
1781 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1782 return ret;
1783
1784 if (options && options->effective_url && options->base_url) {
1785 if (update_url_from_redirect(options->base_url,
1786 url, options->effective_url)) {
1787 credential_from_url(&http_auth, options->base_url->buf);
1788 url = options->effective_url->buf;
1789 }
1790 }
1791
1792 if (ret != HTTP_REAUTH)
1793 return ret;
1794
1795 /*
1796 * If we are using KEEP_ERROR, the previous request may have
1797 * put cruft into our output stream; we should clear it out before
1798 * making our next request. We only know how to do this for
1799 * the strbuf case, but that is enough to satisfy current callers.
1800 */
1801 if (options && options->keep_error) {
1802 switch (target) {
1803 case HTTP_REQUEST_STRBUF:
1804 strbuf_reset(result);
1805 break;
1806 default:
1807 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1808 }
1809 }
1810
1811 credential_fill(&http_auth);
1812
1813 return http_request(url, result, target, options);
1814 }
1815
1816 int http_get_strbuf(const char *url,
1817 struct strbuf *result,
1818 struct http_get_options *options)
1819 {
1820 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1821 }
1822
1823 /*
1824 * Downloads a URL and stores the result in the given file.
1825 *
1826 * If a previous interrupted download is detected (i.e. a previous temporary
1827 * file is still around) the download is resumed.
1828 */
1829 static int http_get_file(const char *url, const char *filename,
1830 struct http_get_options *options)
1831 {
1832 int ret;
1833 struct strbuf tmpfile = STRBUF_INIT;
1834 FILE *result;
1835
1836 strbuf_addf(&tmpfile, "%s.temp", filename);
1837 result = fopen(tmpfile.buf, "a");
1838 if (!result) {
1839 error("Unable to open local file %s", tmpfile.buf);
1840 ret = HTTP_ERROR;
1841 goto cleanup;
1842 }
1843
1844 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1845 fclose(result);
1846
1847 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1848 ret = HTTP_ERROR;
1849 cleanup:
1850 strbuf_release(&tmpfile);
1851 return ret;
1852 }
1853
1854 int http_fetch_ref(const char *base, struct ref *ref)
1855 {
1856 struct http_get_options options = {0};
1857 char *url;
1858 struct strbuf buffer = STRBUF_INIT;
1859 int ret = -1;
1860
1861 options.no_cache = 1;
1862
1863 url = quote_ref_url(base, ref->name);
1864 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1865 strbuf_rtrim(&buffer);
1866 if (buffer.len == 40)
1867 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1868 else if (starts_with(buffer.buf, "ref: ")) {
1869 ref->symref = xstrdup(buffer.buf + 5);
1870 ret = 0;
1871 }
1872 }
1873
1874 strbuf_release(&buffer);
1875 free(url);
1876 return ret;
1877 }
1878
1879 /* Helpers for fetching packs */
1880 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1881 {
1882 char *url, *tmp;
1883 struct strbuf buf = STRBUF_INIT;
1884
1885 if (http_is_verbose)
1886 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1887
1888 end_url_with_slash(&buf, base_url);
1889 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1890 url = strbuf_detach(&buf, NULL);
1891
1892 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1893 tmp = strbuf_detach(&buf, NULL);
1894
1895 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1896 error("Unable to get pack index %s", url);
1897 FREE_AND_NULL(tmp);
1898 }
1899
1900 free(url);
1901 return tmp;
1902 }
1903
1904 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1905 unsigned char *sha1, const char *base_url)
1906 {
1907 struct packed_git *new_pack;
1908 char *tmp_idx = NULL;
1909 int ret;
1910
1911 if (has_pack_index(sha1)) {
1912 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1913 if (!new_pack)
1914 return -1; /* parse_pack_index() already issued error message */
1915 goto add_pack;
1916 }
1917
1918 tmp_idx = fetch_pack_index(sha1, base_url);
1919 if (!tmp_idx)
1920 return -1;
1921
1922 new_pack = parse_pack_index(sha1, tmp_idx);
1923 if (!new_pack) {
1924 unlink(tmp_idx);
1925 free(tmp_idx);
1926
1927 return -1; /* parse_pack_index() already issued error message */
1928 }
1929
1930 ret = verify_pack_index(new_pack);
1931 if (!ret) {
1932 close_pack_index(new_pack);
1933 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1934 }
1935 free(tmp_idx);
1936 if (ret)
1937 return -1;
1938
1939 add_pack:
1940 new_pack->next = *packs_head;
1941 *packs_head = new_pack;
1942 return 0;
1943 }
1944
1945 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1946 {
1947 struct http_get_options options = {0};
1948 int ret = 0, i = 0;
1949 char *url, *data;
1950 struct strbuf buf = STRBUF_INIT;
1951 unsigned char sha1[20];
1952
1953 end_url_with_slash(&buf, base_url);
1954 strbuf_addstr(&buf, "objects/info/packs");
1955 url = strbuf_detach(&buf, NULL);
1956
1957 options.no_cache = 1;
1958 ret = http_get_strbuf(url, &buf, &options);
1959 if (ret != HTTP_OK)
1960 goto cleanup;
1961
1962 data = buf.buf;
1963 while (i < buf.len) {
1964 switch (data[i]) {
1965 case 'P':
1966 i++;
1967 if (i + 52 <= buf.len &&
1968 starts_with(data + i, " pack-") &&
1969 starts_with(data + i + 46, ".pack\n")) {
1970 get_sha1_hex(data + i + 6, sha1);
1971 fetch_and_setup_pack_index(packs_head, sha1,
1972 base_url);
1973 i += 51;
1974 break;
1975 }
1976 default:
1977 while (i < buf.len && data[i] != '\n')
1978 i++;
1979 }
1980 i++;
1981 }
1982
1983 cleanup:
1984 free(url);
1985 return ret;
1986 }
1987
1988 void release_http_pack_request(struct http_pack_request *preq)
1989 {
1990 if (preq->packfile != NULL) {
1991 fclose(preq->packfile);
1992 preq->packfile = NULL;
1993 }
1994 preq->slot = NULL;
1995 free(preq->url);
1996 free(preq);
1997 }
1998
1999 int finish_http_pack_request(struct http_pack_request *preq)
2000 {
2001 struct packed_git **lst;
2002 struct packed_git *p = preq->target;
2003 char *tmp_idx;
2004 size_t len;
2005 struct child_process ip = CHILD_PROCESS_INIT;
2006 const char *ip_argv[8];
2007
2008 close_pack_index(p);
2009
2010 fclose(preq->packfile);
2011 preq->packfile = NULL;
2012
2013 lst = preq->lst;
2014 while (*lst != p)
2015 lst = &((*lst)->next);
2016 *lst = (*lst)->next;
2017
2018 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2019 die("BUG: pack tmpfile does not end in .pack.temp?");
2020 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2021
2022 ip_argv[0] = "index-pack";
2023 ip_argv[1] = "-o";
2024 ip_argv[2] = tmp_idx;
2025 ip_argv[3] = preq->tmpfile;
2026 ip_argv[4] = NULL;
2027
2028 ip.argv = ip_argv;
2029 ip.git_cmd = 1;
2030 ip.no_stdin = 1;
2031 ip.no_stdout = 1;
2032
2033 if (run_command(&ip)) {
2034 unlink(preq->tmpfile);
2035 unlink(tmp_idx);
2036 free(tmp_idx);
2037 return -1;
2038 }
2039
2040 unlink(sha1_pack_index_name(p->sha1));
2041
2042 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2043 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2044 free(tmp_idx);
2045 return -1;
2046 }
2047
2048 install_packed_git(p);
2049 free(tmp_idx);
2050 return 0;
2051 }
2052
2053 struct http_pack_request *new_http_pack_request(
2054 struct packed_git *target, const char *base_url)
2055 {
2056 off_t prev_posn = 0;
2057 struct strbuf buf = STRBUF_INIT;
2058 struct http_pack_request *preq;
2059
2060 preq = xcalloc(1, sizeof(*preq));
2061 preq->target = target;
2062
2063 end_url_with_slash(&buf, base_url);
2064 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2065 sha1_to_hex(target->sha1));
2066 preq->url = strbuf_detach(&buf, NULL);
2067
2068 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2069 sha1_pack_name(target->sha1));
2070 preq->packfile = fopen(preq->tmpfile, "a");
2071 if (!preq->packfile) {
2072 error("Unable to open local file %s for pack",
2073 preq->tmpfile);
2074 goto abort;
2075 }
2076
2077 preq->slot = get_active_slot();
2078 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2079 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2080 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2081 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2082 no_pragma_header);
2083
2084 /*
2085 * If there is data present from a previous transfer attempt,
2086 * resume where it left off
2087 */
2088 prev_posn = ftello(preq->packfile);
2089 if (prev_posn>0) {
2090 if (http_is_verbose)
2091 fprintf(stderr,
2092 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2093 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2094 http_opt_request_remainder(preq->slot->curl, prev_posn);
2095 }
2096
2097 return preq;
2098
2099 abort:
2100 free(preq->url);
2101 free(preq);
2102 return NULL;
2103 }
2104
2105 /* Helpers for fetching objects (loose) */
2106 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2107 void *data)
2108 {
2109 unsigned char expn[4096];
2110 size_t size = eltsize * nmemb;
2111 int posn = 0;
2112 struct http_object_request *freq = data;
2113 struct active_request_slot *slot = freq->slot;
2114
2115 if (slot) {
2116 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2117 &slot->http_code);
2118 if (c != CURLE_OK)
2119 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2120 curl_easy_strerror(c));
2121 if (slot->http_code >= 300)
2122 return size;
2123 }
2124
2125 do {
2126 ssize_t retval = xwrite(freq->localfile,
2127 (char *) ptr + posn, size - posn);
2128 if (retval < 0)
2129 return posn;
2130 posn += retval;
2131 } while (posn < size);
2132
2133 freq->stream.avail_in = size;
2134 freq->stream.next_in = (void *)ptr;
2135 do {
2136 freq->stream.next_out = expn;
2137 freq->stream.avail_out = sizeof(expn);
2138 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2139 git_SHA1_Update(&freq->c, expn,
2140 sizeof(expn) - freq->stream.avail_out);
2141 } while (freq->stream.avail_in && freq->zret == Z_OK);
2142 return size;
2143 }
2144
2145 struct http_object_request *new_http_object_request(const char *base_url,
2146 unsigned char *sha1)
2147 {
2148 char *hex = sha1_to_hex(sha1);
2149 const char *filename;
2150 char prevfile[PATH_MAX];
2151 int prevlocal;
2152 char prev_buf[PREV_BUF_SIZE];
2153 ssize_t prev_read = 0;
2154 off_t prev_posn = 0;
2155 struct http_object_request *freq;
2156
2157 freq = xcalloc(1, sizeof(*freq));
2158 hashcpy(freq->sha1, sha1);
2159 freq->localfile = -1;
2160
2161 filename = sha1_file_name(sha1);
2162 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2163 "%s.temp", filename);
2164
2165 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2166 unlink_or_warn(prevfile);
2167 rename(freq->tmpfile, prevfile);
2168 unlink_or_warn(freq->tmpfile);
2169
2170 if (freq->localfile != -1)
2171 error("fd leakage in start: %d", freq->localfile);
2172 freq->localfile = open(freq->tmpfile,
2173 O_WRONLY | O_CREAT | O_EXCL, 0666);
2174 /*
2175 * This could have failed due to the "lazy directory creation";
2176 * try to mkdir the last path component.
2177 */
2178 if (freq->localfile < 0 && errno == ENOENT) {
2179 char *dir = strrchr(freq->tmpfile, '/');
2180 if (dir) {
2181 *dir = 0;
2182 mkdir(freq->tmpfile, 0777);
2183 *dir = '/';
2184 }
2185 freq->localfile = open(freq->tmpfile,
2186 O_WRONLY | O_CREAT | O_EXCL, 0666);
2187 }
2188
2189 if (freq->localfile < 0) {
2190 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2191 goto abort;
2192 }
2193
2194 git_inflate_init(&freq->stream);
2195
2196 git_SHA1_Init(&freq->c);
2197
2198 freq->url = get_remote_object_url(base_url, hex, 0);
2199
2200 /*
2201 * If a previous temp file is present, process what was already
2202 * fetched.
2203 */
2204 prevlocal = open(prevfile, O_RDONLY);
2205 if (prevlocal != -1) {
2206 do {
2207 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2208 if (prev_read>0) {
2209 if (fwrite_sha1_file(prev_buf,
2210 1,
2211 prev_read,
2212 freq) == prev_read) {
2213 prev_posn += prev_read;
2214 } else {
2215 prev_read = -1;
2216 }
2217 }
2218 } while (prev_read > 0);
2219 close(prevlocal);
2220 }
2221 unlink_or_warn(prevfile);
2222
2223 /*
2224 * Reset inflate/SHA1 if there was an error reading the previous temp
2225 * file; also rewind to the beginning of the local file.
2226 */
2227 if (prev_read == -1) {
2228 memset(&freq->stream, 0, sizeof(freq->stream));
2229 git_inflate_init(&freq->stream);
2230 git_SHA1_Init(&freq->c);
2231 if (prev_posn>0) {
2232 prev_posn = 0;
2233 lseek(freq->localfile, 0, SEEK_SET);
2234 if (ftruncate(freq->localfile, 0) < 0) {
2235 error_errno("Couldn't truncate temporary file %s",
2236 freq->tmpfile);
2237 goto abort;
2238 }
2239 }
2240 }
2241
2242 freq->slot = get_active_slot();
2243
2244 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2245 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2246 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2247 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2248 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2249 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2250
2251 /*
2252 * If we have successfully processed data from a previous fetch
2253 * attempt, only fetch the data we don't already have.
2254 */
2255 if (prev_posn>0) {
2256 if (http_is_verbose)
2257 fprintf(stderr,
2258 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2259 hex, (uintmax_t)prev_posn);
2260 http_opt_request_remainder(freq->slot->curl, prev_posn);
2261 }
2262
2263 return freq;
2264
2265 abort:
2266 free(freq->url);
2267 free(freq);
2268 return NULL;
2269 }
2270
2271 void process_http_object_request(struct http_object_request *freq)
2272 {
2273 if (freq->slot == NULL)
2274 return;
2275 freq->curl_result = freq->slot->curl_result;
2276 freq->http_code = freq->slot->http_code;
2277 freq->slot = NULL;
2278 }
2279
2280 int finish_http_object_request(struct http_object_request *freq)
2281 {
2282 struct stat st;
2283
2284 close(freq->localfile);
2285 freq->localfile = -1;
2286
2287 process_http_object_request(freq);
2288
2289 if (freq->http_code == 416) {
2290 warning("requested range invalid; we may already have all the data.");
2291 } else if (freq->curl_result != CURLE_OK) {
2292 if (stat(freq->tmpfile, &st) == 0)
2293 if (st.st_size == 0)
2294 unlink_or_warn(freq->tmpfile);
2295 return -1;
2296 }
2297
2298 git_inflate_end(&freq->stream);
2299 git_SHA1_Final(freq->real_sha1, &freq->c);
2300 if (freq->zret != Z_STREAM_END) {
2301 unlink_or_warn(freq->tmpfile);
2302 return -1;
2303 }
2304 if (hashcmp(freq->sha1, freq->real_sha1)) {
2305 unlink_or_warn(freq->tmpfile);
2306 return -1;
2307 }
2308 freq->rename =
2309 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2310
2311 return freq->rename;
2312 }
2313
2314 void abort_http_object_request(struct http_object_request *freq)
2315 {
2316 unlink_or_warn(freq->tmpfile);
2317
2318 release_http_object_request(freq);
2319 }
2320
2321 void release_http_object_request(struct http_object_request *freq)
2322 {
2323 if (freq->localfile != -1) {
2324 close(freq->localfile);
2325 freq->localfile = -1;
2326 }
2327 if (freq->url != NULL) {
2328 FREE_AND_NULL(freq->url);
2329 }
2330 if (freq->slot != NULL) {
2331 freq->slot->callback_func = NULL;
2332 freq->slot->callback_data = NULL;
2333 release_active_slot(freq->slot);
2334 freq->slot = NULL;
2335 }
2336 }
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