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http.postbuffer: allow full range of ssize_t values
[alt-git.git] / http.c
blob7bccb3645958a07df578c943a97c0dc6f266de6e
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 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
23
24 #if LIBCURL_VERSION_NUM >= 0x070a06
25 #define LIBCURL_CAN_HANDLE_AUTH_ANY
26 #endif
27
28 static int min_curl_sessions = 1;
29 static int curl_session_count;
30 #ifdef USE_CURL_MULTI
31 static int max_requests = -1;
32 static CURLM *curlm;
33 #endif
34 #ifndef NO_CURL_EASY_DUPHANDLE
35 static CURL *curl_default;
36 #endif
37
38 #define PREV_BUF_SIZE 4096
39
40 char curl_errorstr[CURL_ERROR_SIZE];
41
42 static int curl_ssl_verify = -1;
43 static int curl_ssl_try;
44 static const char *ssl_cert;
45 static const char *ssl_cipherlist;
46 static const char *ssl_version;
47 static struct {
48 const char *name;
49 long ssl_version;
50 } sslversions[] = {
51 { "sslv2", CURL_SSLVERSION_SSLv2 },
52 { "sslv3", CURL_SSLVERSION_SSLv3 },
53 { "tlsv1", CURL_SSLVERSION_TLSv1 },
54 #if LIBCURL_VERSION_NUM >= 0x072200
55 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
56 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
57 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
58 #endif
59 };
60 #if LIBCURL_VERSION_NUM >= 0x070903
61 static const char *ssl_key;
62 #endif
63 #if LIBCURL_VERSION_NUM >= 0x070908
64 static const char *ssl_capath;
65 #endif
66 #if LIBCURL_VERSION_NUM >= 0x072c00
67 static const char *ssl_pinnedkey;
68 #endif
69 static const char *ssl_cainfo;
70 static long curl_low_speed_limit = -1;
71 static long curl_low_speed_time = -1;
72 static int curl_ftp_no_epsv;
73 static const char *curl_http_proxy;
74 static const char *curl_no_proxy;
75 static const char *http_proxy_authmethod;
76 static struct {
77 const char *name;
78 long curlauth_param;
79 } proxy_authmethods[] = {
80 { "basic", CURLAUTH_BASIC },
81 { "digest", CURLAUTH_DIGEST },
82 { "negotiate", CURLAUTH_GSSNEGOTIATE },
83 { "ntlm", CURLAUTH_NTLM },
84 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
85 { "anyauth", CURLAUTH_ANY },
86 #endif
87 /*
88 * CURLAUTH_DIGEST_IE has no corresponding command-line option in
89 * curl(1) and is not included in CURLAUTH_ANY, so we leave it out
90 * here, too
91 */
92 };
93 #if LIBCURL_VERSION_NUM >= 0x071600
94 static const char *curl_deleg;
95 static struct {
96 const char *name;
97 long curl_deleg_param;
98 } curl_deleg_levels[] = {
99 { "none", CURLGSSAPI_DELEGATION_NONE },
100 { "policy", CURLGSSAPI_DELEGATION_POLICY_FLAG },
101 { "always", CURLGSSAPI_DELEGATION_FLAG },
102 };
103 #endif
104
105 static struct credential proxy_auth = CREDENTIAL_INIT;
106 static const char *curl_proxyuserpwd;
107 static const char *curl_cookie_file;
108 static int curl_save_cookies;
109 struct credential http_auth = CREDENTIAL_INIT;
110 static int http_proactive_auth;
111 static const char *user_agent;
112 static int curl_empty_auth = -1;
113
114 enum http_follow_config http_follow_config = HTTP_FOLLOW_INITIAL;
115
116 #if LIBCURL_VERSION_NUM >= 0x071700
117 /* Use CURLOPT_KEYPASSWD as is */
118 #elif LIBCURL_VERSION_NUM >= 0x070903
119 #define CURLOPT_KEYPASSWD CURLOPT_SSLKEYPASSWD
120 #else
121 #define CURLOPT_KEYPASSWD CURLOPT_SSLCERTPASSWD
122 #endif
123
124 static struct credential cert_auth = CREDENTIAL_INIT;
125 static int ssl_cert_password_required;
126 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
127 static unsigned long http_auth_methods = CURLAUTH_ANY;
128 static int http_auth_methods_restricted;
129 /* Modes for which empty_auth cannot actually help us. */
130 static unsigned long empty_auth_useless =
131 CURLAUTH_BASIC
132 #ifdef CURLAUTH_DIGEST_IE
133 | CURLAUTH_DIGEST_IE
134 #endif
135 | CURLAUTH_DIGEST;
136 #endif
137
138 static struct curl_slist *pragma_header;
139 static struct curl_slist *no_pragma_header;
140 static struct curl_slist *extra_http_headers;
141
142 static struct active_request_slot *active_queue_head;
143
144 static char *cached_accept_language;
145
146 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
147 {
148 size_t size = eltsize * nmemb;
149 struct buffer *buffer = buffer_;
150
151 if (size > buffer->buf.len - buffer->posn)
152 size = buffer->buf.len - buffer->posn;
153 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
154 buffer->posn += size;
155
156 return size;
157 }
158
159 #ifndef NO_CURL_IOCTL
160 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
161 {
162 struct buffer *buffer = clientp;
163
164 switch (cmd) {
165 case CURLIOCMD_NOP:
166 return CURLIOE_OK;
167
168 case CURLIOCMD_RESTARTREAD:
169 buffer->posn = 0;
170 return CURLIOE_OK;
171
172 default:
173 return CURLIOE_UNKNOWNCMD;
174 }
175 }
176 #endif
177
178 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
179 {
180 size_t size = eltsize * nmemb;
181 struct strbuf *buffer = buffer_;
182
183 strbuf_add(buffer, ptr, size);
184 return size;
185 }
186
187 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
188 {
189 return eltsize * nmemb;
190 }
191
192 static void closedown_active_slot(struct active_request_slot *slot)
193 {
194 active_requests--;
195 slot->in_use = 0;
196 }
197
198 static void finish_active_slot(struct active_request_slot *slot)
199 {
200 closedown_active_slot(slot);
201 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
202
203 if (slot->finished != NULL)
204 (*slot->finished) = 1;
205
206 /* Store slot results so they can be read after the slot is reused */
207 if (slot->results != NULL) {
208 slot->results->curl_result = slot->curl_result;
209 slot->results->http_code = slot->http_code;
210 #if LIBCURL_VERSION_NUM >= 0x070a08
211 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
212 &slot->results->auth_avail);
213 #else
214 slot->results->auth_avail = 0;
215 #endif
216
217 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
218 &slot->results->http_connectcode);
219 }
220
221 /* Run callback if appropriate */
222 if (slot->callback_func != NULL)
223 slot->callback_func(slot->callback_data);
224 }
225
226 static void xmulti_remove_handle(struct active_request_slot *slot)
227 {
228 #ifdef USE_CURL_MULTI
229 curl_multi_remove_handle(curlm, slot->curl);
230 #endif
231 }
232
233 #ifdef USE_CURL_MULTI
234 static void process_curl_messages(void)
235 {
236 int num_messages;
237 struct active_request_slot *slot;
238 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
239
240 while (curl_message != NULL) {
241 if (curl_message->msg == CURLMSG_DONE) {
242 int curl_result = curl_message->data.result;
243 slot = active_queue_head;
244 while (slot != NULL &&
245 slot->curl != curl_message->easy_handle)
246 slot = slot->next;
247 if (slot != NULL) {
248 xmulti_remove_handle(slot);
249 slot->curl_result = curl_result;
250 finish_active_slot(slot);
251 } else {
252 fprintf(stderr, "Received DONE message for unknown request!\n");
253 }
254 } else {
255 fprintf(stderr, "Unknown CURL message received: %d\n",
256 (int)curl_message->msg);
257 }
258 curl_message = curl_multi_info_read(curlm, &num_messages);
259 }
260 }
261 #endif
262
263 static int http_options(const char *var, const char *value, void *cb)
264 {
265 if (!strcmp("http.sslverify", var)) {
266 curl_ssl_verify = git_config_bool(var, value);
267 return 0;
268 }
269 if (!strcmp("http.sslcipherlist", var))
270 return git_config_string(&ssl_cipherlist, var, value);
271 if (!strcmp("http.sslversion", var))
272 return git_config_string(&ssl_version, var, value);
273 if (!strcmp("http.sslcert", var))
274 return git_config_string(&ssl_cert, var, value);
275 #if LIBCURL_VERSION_NUM >= 0x070903
276 if (!strcmp("http.sslkey", var))
277 return git_config_string(&ssl_key, var, value);
278 #endif
279 #if LIBCURL_VERSION_NUM >= 0x070908
280 if (!strcmp("http.sslcapath", var))
281 return git_config_pathname(&ssl_capath, var, value);
282 #endif
283 if (!strcmp("http.sslcainfo", var))
284 return git_config_pathname(&ssl_cainfo, var, value);
285 if (!strcmp("http.sslcertpasswordprotected", var)) {
286 ssl_cert_password_required = git_config_bool(var, value);
287 return 0;
288 }
289 if (!strcmp("http.ssltry", var)) {
290 curl_ssl_try = git_config_bool(var, value);
291 return 0;
292 }
293 if (!strcmp("http.minsessions", var)) {
294 min_curl_sessions = git_config_int(var, value);
295 #ifndef USE_CURL_MULTI
296 if (min_curl_sessions > 1)
297 min_curl_sessions = 1;
298 #endif
299 return 0;
300 }
301 #ifdef USE_CURL_MULTI
302 if (!strcmp("http.maxrequests", var)) {
303 max_requests = git_config_int(var, value);
304 return 0;
305 }
306 #endif
307 if (!strcmp("http.lowspeedlimit", var)) {
308 curl_low_speed_limit = (long)git_config_int(var, value);
309 return 0;
310 }
311 if (!strcmp("http.lowspeedtime", var)) {
312 curl_low_speed_time = (long)git_config_int(var, value);
313 return 0;
314 }
315
316 if (!strcmp("http.noepsv", var)) {
317 curl_ftp_no_epsv = git_config_bool(var, value);
318 return 0;
319 }
320 if (!strcmp("http.proxy", var))
321 return git_config_string(&curl_http_proxy, var, value);
322
323 if (!strcmp("http.proxyauthmethod", var))
324 return git_config_string(&http_proxy_authmethod, var, value);
325
326 if (!strcmp("http.cookiefile", var))
327 return git_config_pathname(&curl_cookie_file, var, value);
328 if (!strcmp("http.savecookies", var)) {
329 curl_save_cookies = git_config_bool(var, value);
330 return 0;
331 }
332
333 if (!strcmp("http.postbuffer", var)) {
334 http_post_buffer = git_config_ssize_t(var, value);
335 if (http_post_buffer < 0)
336 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
337 if (http_post_buffer < LARGE_PACKET_MAX)
338 http_post_buffer = LARGE_PACKET_MAX;
339 return 0;
340 }
341
342 if (!strcmp("http.useragent", var))
343 return git_config_string(&user_agent, var, value);
344
345 if (!strcmp("http.emptyauth", var)) {
346 if (value && !strcmp("auto", value))
347 curl_empty_auth = -1;
348 else
349 curl_empty_auth = git_config_bool(var, value);
350 return 0;
351 }
352
353 if (!strcmp("http.delegation", var)) {
354 #if LIBCURL_VERSION_NUM >= 0x071600
355 return git_config_string(&curl_deleg, var, value);
356 #else
357 warning(_("Delegation control is not supported with cURL < 7.22.0"));
358 return 0;
359 #endif
360 }
361
362 if (!strcmp("http.pinnedpubkey", var)) {
363 #if LIBCURL_VERSION_NUM >= 0x072c00
364 return git_config_pathname(&ssl_pinnedkey, var, value);
365 #else
366 warning(_("Public key pinning not supported with cURL < 7.44.0"));
367 return 0;
368 #endif
369 }
370
371 if (!strcmp("http.extraheader", var)) {
372 if (!value) {
373 return config_error_nonbool(var);
374 } else if (!*value) {
375 curl_slist_free_all(extra_http_headers);
376 extra_http_headers = NULL;
377 } else {
378 extra_http_headers =
379 curl_slist_append(extra_http_headers, value);
380 }
381 return 0;
382 }
383
384 if (!strcmp("http.followredirects", var)) {
385 if (value && !strcmp(value, "initial"))
386 http_follow_config = HTTP_FOLLOW_INITIAL;
387 else if (git_config_bool(var, value))
388 http_follow_config = HTTP_FOLLOW_ALWAYS;
389 else
390 http_follow_config = HTTP_FOLLOW_NONE;
391 return 0;
392 }
393
394 /* Fall back on the default ones */
395 return git_default_config(var, value, cb);
396 }
397
398 static int curl_empty_auth_enabled(void)
399 {
400 if (curl_empty_auth >= 0)
401 return curl_empty_auth;
402
403 #ifndef LIBCURL_CAN_HANDLE_AUTH_ANY
404 /*
405 * Our libcurl is too old to do AUTH_ANY in the first place;
406 * just default to turning the feature off.
407 */
408 #else
409 /*
410 * In the automatic case, kick in the empty-auth
411 * hack as long as we would potentially try some
412 * method more exotic than "Basic" or "Digest".
413 *
414 * But only do this when this is our second or
415 * subsequent request, as by then we know what
416 * methods are available.
417 */
418 if (http_auth_methods_restricted &&
419 (http_auth_methods & ~empty_auth_useless))
420 return 1;
421 #endif
422 return 0;
423 }
424
425 static void init_curl_http_auth(CURL *result)
426 {
427 if (!http_auth.username || !*http_auth.username) {
428 if (curl_empty_auth_enabled())
429 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
430 return;
431 }
432
433 credential_fill(&http_auth);
434
435 #if LIBCURL_VERSION_NUM >= 0x071301
436 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
437 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
438 #else
439 {
440 static struct strbuf up = STRBUF_INIT;
441 /*
442 * Note that we assume we only ever have a single set of
443 * credentials in a given program run, so we do not have
444 * to worry about updating this buffer, only setting its
445 * initial value.
446 */
447 if (!up.len)
448 strbuf_addf(&up, "%s:%s",
449 http_auth.username, http_auth.password);
450 curl_easy_setopt(result, CURLOPT_USERPWD, up.buf);
451 }
452 #endif
453 }
454
455 /* *var must be free-able */
456 static void var_override(const char **var, char *value)
457 {
458 if (value) {
459 free((void *)*var);
460 *var = xstrdup(value);
461 }
462 }
463
464 static void set_proxyauth_name_password(CURL *result)
465 {
466 #if LIBCURL_VERSION_NUM >= 0x071301
467 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
468 proxy_auth.username);
469 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
470 proxy_auth.password);
471 #else
472 struct strbuf s = STRBUF_INIT;
473
474 strbuf_addstr_urlencode(&s, proxy_auth.username, 1);
475 strbuf_addch(&s, ':');
476 strbuf_addstr_urlencode(&s, proxy_auth.password, 1);
477 curl_proxyuserpwd = strbuf_detach(&s, NULL);
478 curl_easy_setopt(result, CURLOPT_PROXYUSERPWD, curl_proxyuserpwd);
479 #endif
480 }
481
482 static void init_curl_proxy_auth(CURL *result)
483 {
484 if (proxy_auth.username) {
485 if (!proxy_auth.password)
486 credential_fill(&proxy_auth);
487 set_proxyauth_name_password(result);
488 }
489
490 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
491
492 #if LIBCURL_VERSION_NUM >= 0x070a07 /* CURLOPT_PROXYAUTH and CURLAUTH_ANY */
493 if (http_proxy_authmethod) {
494 int i;
495 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
496 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
497 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
498 proxy_authmethods[i].curlauth_param);
499 break;
500 }
501 }
502 if (i == ARRAY_SIZE(proxy_authmethods)) {
503 warning("unsupported proxy authentication method %s: using anyauth",
504 http_proxy_authmethod);
505 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
506 }
507 }
508 else
509 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
510 #endif
511 }
512
513 static int has_cert_password(void)
514 {
515 if (ssl_cert == NULL || ssl_cert_password_required != 1)
516 return 0;
517 if (!cert_auth.password) {
518 cert_auth.protocol = xstrdup("cert");
519 cert_auth.username = xstrdup("");
520 cert_auth.path = xstrdup(ssl_cert);
521 credential_fill(&cert_auth);
522 }
523 return 1;
524 }
525
526 #if LIBCURL_VERSION_NUM >= 0x071900
527 static void set_curl_keepalive(CURL *c)
528 {
529 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
530 }
531
532 #elif LIBCURL_VERSION_NUM >= 0x071000
533 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
534 {
535 int ka = 1;
536 int rc;
537 socklen_t len = (socklen_t)sizeof(ka);
538
539 if (type != CURLSOCKTYPE_IPCXN)
540 return 0;
541
542 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
543 if (rc < 0)
544 warning_errno("unable to set SO_KEEPALIVE on socket");
545
546 return 0; /* CURL_SOCKOPT_OK only exists since curl 7.21.5 */
547 }
548
549 static void set_curl_keepalive(CURL *c)
550 {
551 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
552 }
553
554 #else
555 static void set_curl_keepalive(CURL *c)
556 {
557 /* not supported on older curl versions */
558 }
559 #endif
560
561 static void redact_sensitive_header(struct strbuf *header)
562 {
563 const char *sensitive_header;
564
565 if (skip_prefix(header->buf, "Authorization:", &sensitive_header) ||
566 skip_prefix(header->buf, "Proxy-Authorization:", &sensitive_header)) {
567 /* The first token is the type, which is OK to log */
568 while (isspace(*sensitive_header))
569 sensitive_header++;
570 while (*sensitive_header && !isspace(*sensitive_header))
571 sensitive_header++;
572 /* Everything else is opaque and possibly sensitive */
573 strbuf_setlen(header, sensitive_header - header->buf);
574 strbuf_addstr(header, " <redacted>");
575 }
576 }
577
578 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
579 {
580 struct strbuf out = STRBUF_INIT;
581 struct strbuf **headers, **header;
582
583 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
584 text, (long)size, (long)size);
585 trace_strbuf(&trace_curl, &out);
586 strbuf_reset(&out);
587 strbuf_add(&out, ptr, size);
588 headers = strbuf_split_max(&out, '\n', 0);
589
590 for (header = headers; *header; header++) {
591 if (hide_sensitive_header)
592 redact_sensitive_header(*header);
593 strbuf_insert((*header), 0, text, strlen(text));
594 strbuf_insert((*header), strlen(text), ": ", 2);
595 strbuf_rtrim((*header));
596 strbuf_addch((*header), '\n');
597 trace_strbuf(&trace_curl, (*header));
598 }
599 strbuf_list_free(headers);
600 strbuf_release(&out);
601 }
602
603 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
604 {
605 size_t i;
606 struct strbuf out = STRBUF_INIT;
607 unsigned int width = 60;
608
609 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
610 text, (long)size, (long)size);
611 trace_strbuf(&trace_curl, &out);
612
613 for (i = 0; i < size; i += width) {
614 size_t w;
615
616 strbuf_reset(&out);
617 strbuf_addf(&out, "%s: ", text);
618 for (w = 0; (w < width) && (i + w < size); w++) {
619 unsigned char ch = ptr[i + w];
620
621 strbuf_addch(&out,
622 (ch >= 0x20) && (ch < 0x80)
623 ? ch : '.');
624 }
625 strbuf_addch(&out, '\n');
626 trace_strbuf(&trace_curl, &out);
627 }
628 strbuf_release(&out);
629 }
630
631 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
632 {
633 const char *text;
634 enum { NO_FILTER = 0, DO_FILTER = 1 };
635
636 switch (type) {
637 case CURLINFO_TEXT:
638 trace_printf_key(&trace_curl, "== Info: %s", data);
639 default: /* we ignore unknown types by default */
640 return 0;
641
642 case CURLINFO_HEADER_OUT:
643 text = "=> Send header";
644 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
645 break;
646 case CURLINFO_DATA_OUT:
647 text = "=> Send data";
648 curl_dump_data(text, (unsigned char *)data, size);
649 break;
650 case CURLINFO_SSL_DATA_OUT:
651 text = "=> Send SSL data";
652 curl_dump_data(text, (unsigned char *)data, size);
653 break;
654 case CURLINFO_HEADER_IN:
655 text = "<= Recv header";
656 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
657 break;
658 case CURLINFO_DATA_IN:
659 text = "<= Recv data";
660 curl_dump_data(text, (unsigned char *)data, size);
661 break;
662 case CURLINFO_SSL_DATA_IN:
663 text = "<= Recv SSL data";
664 curl_dump_data(text, (unsigned char *)data, size);
665 break;
666 }
667 return 0;
668 }
669
670 void setup_curl_trace(CURL *handle)
671 {
672 if (!trace_want(&trace_curl))
673 return;
674 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
675 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
676 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
677 }
678
679 static long get_curl_allowed_protocols(int from_user)
680 {
681 long allowed_protocols = 0;
682
683 if (is_transport_allowed("http", from_user))
684 allowed_protocols |= CURLPROTO_HTTP;
685 if (is_transport_allowed("https", from_user))
686 allowed_protocols |= CURLPROTO_HTTPS;
687 if (is_transport_allowed("ftp", from_user))
688 allowed_protocols |= CURLPROTO_FTP;
689 if (is_transport_allowed("ftps", from_user))
690 allowed_protocols |= CURLPROTO_FTPS;
691
692 return allowed_protocols;
693 }
694
695 static CURL *get_curl_handle(void)
696 {
697 CURL *result = curl_easy_init();
698
699 if (!result)
700 die("curl_easy_init failed");
701
702 if (!curl_ssl_verify) {
703 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
704 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
705 } else {
706 /* Verify authenticity of the peer's certificate */
707 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
708 /* The name in the cert must match whom we tried to connect */
709 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
710 }
711
712 #if LIBCURL_VERSION_NUM >= 0x070907
713 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
714 #endif
715 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
716 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
717 #endif
718
719 #if LIBCURL_VERSION_NUM >= 0x071600
720 if (curl_deleg) {
721 int i;
722 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
723 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
724 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
725 curl_deleg_levels[i].curl_deleg_param);
726 break;
727 }
728 }
729 if (i == ARRAY_SIZE(curl_deleg_levels))
730 warning("Unknown delegation method '%s': using default",
731 curl_deleg);
732 }
733 #endif
734
735 if (http_proactive_auth)
736 init_curl_http_auth(result);
737
738 if (getenv("GIT_SSL_VERSION"))
739 ssl_version = getenv("GIT_SSL_VERSION");
740 if (ssl_version && *ssl_version) {
741 int i;
742 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
743 if (!strcmp(ssl_version, sslversions[i].name)) {
744 curl_easy_setopt(result, CURLOPT_SSLVERSION,
745 sslversions[i].ssl_version);
746 break;
747 }
748 }
749 if (i == ARRAY_SIZE(sslversions))
750 warning("unsupported ssl version %s: using default",
751 ssl_version);
752 }
753
754 if (getenv("GIT_SSL_CIPHER_LIST"))
755 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
756 if (ssl_cipherlist != NULL && *ssl_cipherlist)
757 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
758 ssl_cipherlist);
759
760 if (ssl_cert != NULL)
761 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
762 if (has_cert_password())
763 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
764 #if LIBCURL_VERSION_NUM >= 0x070903
765 if (ssl_key != NULL)
766 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
767 #endif
768 #if LIBCURL_VERSION_NUM >= 0x070908
769 if (ssl_capath != NULL)
770 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
771 #endif
772 #if LIBCURL_VERSION_NUM >= 0x072c00
773 if (ssl_pinnedkey != NULL)
774 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
775 #endif
776 if (ssl_cainfo != NULL)
777 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
778
779 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
780 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
781 curl_low_speed_limit);
782 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
783 curl_low_speed_time);
784 }
785
786 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
787 #if LIBCURL_VERSION_NUM >= 0x071301
788 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
789 #elif LIBCURL_VERSION_NUM >= 0x071101
790 curl_easy_setopt(result, CURLOPT_POST301, 1);
791 #endif
792 #if LIBCURL_VERSION_NUM >= 0x071304
793 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
794 get_curl_allowed_protocols(0));
795 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
796 get_curl_allowed_protocols(-1));
797 #else
798 warning("protocol restrictions not applied to curl redirects because\n"
799 "your curl version is too old (>= 7.19.4)");
800 #endif
801 if (getenv("GIT_CURL_VERBOSE"))
802 curl_easy_setopt(result, CURLOPT_VERBOSE, 1L);
803 setup_curl_trace(result);
804
805 curl_easy_setopt(result, CURLOPT_USERAGENT,
806 user_agent ? user_agent : git_user_agent());
807
808 if (curl_ftp_no_epsv)
809 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
810
811 #ifdef CURLOPT_USE_SSL
812 if (curl_ssl_try)
813 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
814 #endif
815
816 /*
817 * CURL also examines these variables as a fallback; but we need to query
818 * them here in order to decide whether to prompt for missing password (cf.
819 * init_curl_proxy_auth()).
820 *
821 * Unlike many other common environment variables, these are historically
822 * lowercase only. It appears that CURL did not know this and implemented
823 * only uppercase variants, which was later corrected to take both - with
824 * the exception of http_proxy, which is lowercase only also in CURL. As
825 * the lowercase versions are the historical quasi-standard, they take
826 * precedence here, as in CURL.
827 */
828 if (!curl_http_proxy) {
829 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
830 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
831 var_override(&curl_http_proxy, getenv("https_proxy"));
832 } else {
833 var_override(&curl_http_proxy, getenv("http_proxy"));
834 }
835 if (!curl_http_proxy) {
836 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
837 var_override(&curl_http_proxy, getenv("all_proxy"));
838 }
839 }
840
841 if (curl_http_proxy) {
842 curl_easy_setopt(result, CURLOPT_PROXY, curl_http_proxy);
843 #if LIBCURL_VERSION_NUM >= 0x071800
844 if (starts_with(curl_http_proxy, "socks5h"))
845 curl_easy_setopt(result,
846 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
847 else if (starts_with(curl_http_proxy, "socks5"))
848 curl_easy_setopt(result,
849 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
850 else if (starts_with(curl_http_proxy, "socks4a"))
851 curl_easy_setopt(result,
852 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
853 else if (starts_with(curl_http_proxy, "socks"))
854 curl_easy_setopt(result,
855 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
856 #endif
857 if (strstr(curl_http_proxy, "://"))
858 credential_from_url(&proxy_auth, curl_http_proxy);
859 else {
860 struct strbuf url = STRBUF_INIT;
861 strbuf_addf(&url, "http://%s", curl_http_proxy);
862 credential_from_url(&proxy_auth, url.buf);
863 strbuf_release(&url);
864 }
865
866 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
867 #if LIBCURL_VERSION_NUM >= 0x071304
868 var_override(&curl_no_proxy, getenv("NO_PROXY"));
869 var_override(&curl_no_proxy, getenv("no_proxy"));
870 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
871 #endif
872 }
873 init_curl_proxy_auth(result);
874
875 set_curl_keepalive(result);
876
877 return result;
878 }
879
880 static void set_from_env(const char **var, const char *envname)
881 {
882 const char *val = getenv(envname);
883 if (val)
884 *var = val;
885 }
886
887 void http_init(struct remote *remote, const char *url, int proactive_auth)
888 {
889 char *low_speed_limit;
890 char *low_speed_time;
891 char *normalized_url;
892 struct urlmatch_config config = { STRING_LIST_INIT_DUP };
893
894 config.section = "http";
895 config.key = NULL;
896 config.collect_fn = http_options;
897 config.cascade_fn = git_default_config;
898 config.cb = NULL;
899
900 http_is_verbose = 0;
901 normalized_url = url_normalize(url, &config.url);
902
903 git_config(urlmatch_config_entry, &config);
904 free(normalized_url);
905
906 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
907 die("curl_global_init failed");
908
909 http_proactive_auth = proactive_auth;
910
911 if (remote && remote->http_proxy)
912 curl_http_proxy = xstrdup(remote->http_proxy);
913
914 if (remote)
915 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
916
917 pragma_header = curl_slist_append(http_copy_default_headers(),
918 "Pragma: no-cache");
919 no_pragma_header = curl_slist_append(http_copy_default_headers(),
920 "Pragma:");
921
922 #ifdef USE_CURL_MULTI
923 {
924 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
925 if (http_max_requests != NULL)
926 max_requests = atoi(http_max_requests);
927 }
928
929 curlm = curl_multi_init();
930 if (!curlm)
931 die("curl_multi_init failed");
932 #endif
933
934 if (getenv("GIT_SSL_NO_VERIFY"))
935 curl_ssl_verify = 0;
936
937 set_from_env(&ssl_cert, "GIT_SSL_CERT");
938 #if LIBCURL_VERSION_NUM >= 0x070903
939 set_from_env(&ssl_key, "GIT_SSL_KEY");
940 #endif
941 #if LIBCURL_VERSION_NUM >= 0x070908
942 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
943 #endif
944 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
945
946 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
947
948 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
949 if (low_speed_limit != NULL)
950 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
951 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
952 if (low_speed_time != NULL)
953 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
954
955 if (curl_ssl_verify == -1)
956 curl_ssl_verify = 1;
957
958 curl_session_count = 0;
959 #ifdef USE_CURL_MULTI
960 if (max_requests < 1)
961 max_requests = DEFAULT_MAX_REQUESTS;
962 #endif
963
964 if (getenv("GIT_CURL_FTP_NO_EPSV"))
965 curl_ftp_no_epsv = 1;
966
967 if (url) {
968 credential_from_url(&http_auth, url);
969 if (!ssl_cert_password_required &&
970 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
971 starts_with(url, "https://"))
972 ssl_cert_password_required = 1;
973 }
974
975 #ifndef NO_CURL_EASY_DUPHANDLE
976 curl_default = get_curl_handle();
977 #endif
978 }
979
980 void http_cleanup(void)
981 {
982 struct active_request_slot *slot = active_queue_head;
983
984 while (slot != NULL) {
985 struct active_request_slot *next = slot->next;
986 if (slot->curl != NULL) {
987 xmulti_remove_handle(slot);
988 curl_easy_cleanup(slot->curl);
989 }
990 free(slot);
991 slot = next;
992 }
993 active_queue_head = NULL;
994
995 #ifndef NO_CURL_EASY_DUPHANDLE
996 curl_easy_cleanup(curl_default);
997 #endif
998
999 #ifdef USE_CURL_MULTI
1000 curl_multi_cleanup(curlm);
1001 #endif
1002 curl_global_cleanup();
1003
1004 curl_slist_free_all(extra_http_headers);
1005 extra_http_headers = NULL;
1006
1007 curl_slist_free_all(pragma_header);
1008 pragma_header = NULL;
1009
1010 curl_slist_free_all(no_pragma_header);
1011 no_pragma_header = NULL;
1012
1013 if (curl_http_proxy) {
1014 free((void *)curl_http_proxy);
1015 curl_http_proxy = NULL;
1016 }
1017
1018 if (proxy_auth.password) {
1019 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1020 free(proxy_auth.password);
1021 proxy_auth.password = NULL;
1022 }
1023
1024 free((void *)curl_proxyuserpwd);
1025 curl_proxyuserpwd = NULL;
1026
1027 free((void *)http_proxy_authmethod);
1028 http_proxy_authmethod = NULL;
1029
1030 if (cert_auth.password != NULL) {
1031 memset(cert_auth.password, 0, strlen(cert_auth.password));
1032 free(cert_auth.password);
1033 cert_auth.password = NULL;
1034 }
1035 ssl_cert_password_required = 0;
1036
1037 free(cached_accept_language);
1038 cached_accept_language = NULL;
1039 }
1040
1041 struct active_request_slot *get_active_slot(void)
1042 {
1043 struct active_request_slot *slot = active_queue_head;
1044 struct active_request_slot *newslot;
1045
1046 #ifdef USE_CURL_MULTI
1047 int num_transfers;
1048
1049 /* Wait for a slot to open up if the queue is full */
1050 while (active_requests >= max_requests) {
1051 curl_multi_perform(curlm, &num_transfers);
1052 if (num_transfers < active_requests)
1053 process_curl_messages();
1054 }
1055 #endif
1056
1057 while (slot != NULL && slot->in_use)
1058 slot = slot->next;
1059
1060 if (slot == NULL) {
1061 newslot = xmalloc(sizeof(*newslot));
1062 newslot->curl = NULL;
1063 newslot->in_use = 0;
1064 newslot->next = NULL;
1065
1066 slot = active_queue_head;
1067 if (slot == NULL) {
1068 active_queue_head = newslot;
1069 } else {
1070 while (slot->next != NULL)
1071 slot = slot->next;
1072 slot->next = newslot;
1073 }
1074 slot = newslot;
1075 }
1076
1077 if (slot->curl == NULL) {
1078 #ifdef NO_CURL_EASY_DUPHANDLE
1079 slot->curl = get_curl_handle();
1080 #else
1081 slot->curl = curl_easy_duphandle(curl_default);
1082 #endif
1083 curl_session_count++;
1084 }
1085
1086 active_requests++;
1087 slot->in_use = 1;
1088 slot->results = NULL;
1089 slot->finished = NULL;
1090 slot->callback_data = NULL;
1091 slot->callback_func = NULL;
1092 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1093 if (curl_save_cookies)
1094 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1095 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1096 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1097 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1098 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1099 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1100 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1101 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1102 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1103 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1104 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1105
1106 /*
1107 * Default following to off unless "ALWAYS" is configured; this gives
1108 * callers a sane starting point, and they can tweak for individual
1109 * HTTP_FOLLOW_* cases themselves.
1110 */
1111 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1112 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1113 else
1114 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1115
1116 #if LIBCURL_VERSION_NUM >= 0x070a08
1117 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1118 #endif
1119 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1120 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1121 #endif
1122 if (http_auth.password || curl_empty_auth_enabled())
1123 init_curl_http_auth(slot->curl);
1124
1125 return slot;
1126 }
1127
1128 int start_active_slot(struct active_request_slot *slot)
1129 {
1130 #ifdef USE_CURL_MULTI
1131 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1132 int num_transfers;
1133
1134 if (curlm_result != CURLM_OK &&
1135 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1136 warning("curl_multi_add_handle failed: %s",
1137 curl_multi_strerror(curlm_result));
1138 active_requests--;
1139 slot->in_use = 0;
1140 return 0;
1141 }
1142
1143 /*
1144 * We know there must be something to do, since we just added
1145 * something.
1146 */
1147 curl_multi_perform(curlm, &num_transfers);
1148 #endif
1149 return 1;
1150 }
1151
1152 #ifdef USE_CURL_MULTI
1153 struct fill_chain {
1154 void *data;
1155 int (*fill)(void *);
1156 struct fill_chain *next;
1157 };
1158
1159 static struct fill_chain *fill_cfg;
1160
1161 void add_fill_function(void *data, int (*fill)(void *))
1162 {
1163 struct fill_chain *new = xmalloc(sizeof(*new));
1164 struct fill_chain **linkp = &fill_cfg;
1165 new->data = data;
1166 new->fill = fill;
1167 new->next = NULL;
1168 while (*linkp)
1169 linkp = &(*linkp)->next;
1170 *linkp = new;
1171 }
1172
1173 void fill_active_slots(void)
1174 {
1175 struct active_request_slot *slot = active_queue_head;
1176
1177 while (active_requests < max_requests) {
1178 struct fill_chain *fill;
1179 for (fill = fill_cfg; fill; fill = fill->next)
1180 if (fill->fill(fill->data))
1181 break;
1182
1183 if (!fill)
1184 break;
1185 }
1186
1187 while (slot != NULL) {
1188 if (!slot->in_use && slot->curl != NULL
1189 && curl_session_count > min_curl_sessions) {
1190 curl_easy_cleanup(slot->curl);
1191 slot->curl = NULL;
1192 curl_session_count--;
1193 }
1194 slot = slot->next;
1195 }
1196 }
1197
1198 void step_active_slots(void)
1199 {
1200 int num_transfers;
1201 CURLMcode curlm_result;
1202
1203 do {
1204 curlm_result = curl_multi_perform(curlm, &num_transfers);
1205 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1206 if (num_transfers < active_requests) {
1207 process_curl_messages();
1208 fill_active_slots();
1209 }
1210 }
1211 #endif
1212
1213 void run_active_slot(struct active_request_slot *slot)
1214 {
1215 #ifdef USE_CURL_MULTI
1216 fd_set readfds;
1217 fd_set writefds;
1218 fd_set excfds;
1219 int max_fd;
1220 struct timeval select_timeout;
1221 int finished = 0;
1222
1223 slot->finished = &finished;
1224 while (!finished) {
1225 step_active_slots();
1226
1227 if (slot->in_use) {
1228 #if LIBCURL_VERSION_NUM >= 0x070f04
1229 long curl_timeout;
1230 curl_multi_timeout(curlm, &curl_timeout);
1231 if (curl_timeout == 0) {
1232 continue;
1233 } else if (curl_timeout == -1) {
1234 select_timeout.tv_sec = 0;
1235 select_timeout.tv_usec = 50000;
1236 } else {
1237 select_timeout.tv_sec = curl_timeout / 1000;
1238 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1239 }
1240 #else
1241 select_timeout.tv_sec = 0;
1242 select_timeout.tv_usec = 50000;
1243 #endif
1244
1245 max_fd = -1;
1246 FD_ZERO(&readfds);
1247 FD_ZERO(&writefds);
1248 FD_ZERO(&excfds);
1249 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1250
1251 /*
1252 * It can happen that curl_multi_timeout returns a pathologically
1253 * long timeout when curl_multi_fdset returns no file descriptors
1254 * to read. See commit message for more details.
1255 */
1256 if (max_fd < 0 &&
1257 (select_timeout.tv_sec > 0 ||
1258 select_timeout.tv_usec > 50000)) {
1259 select_timeout.tv_sec = 0;
1260 select_timeout.tv_usec = 50000;
1261 }
1262
1263 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1264 }
1265 }
1266 #else
1267 while (slot->in_use) {
1268 slot->curl_result = curl_easy_perform(slot->curl);
1269 finish_active_slot(slot);
1270 }
1271 #endif
1272 }
1273
1274 static void release_active_slot(struct active_request_slot *slot)
1275 {
1276 closedown_active_slot(slot);
1277 if (slot->curl) {
1278 xmulti_remove_handle(slot);
1279 if (curl_session_count > min_curl_sessions) {
1280 curl_easy_cleanup(slot->curl);
1281 slot->curl = NULL;
1282 curl_session_count--;
1283 }
1284 }
1285 #ifdef USE_CURL_MULTI
1286 fill_active_slots();
1287 #endif
1288 }
1289
1290 void finish_all_active_slots(void)
1291 {
1292 struct active_request_slot *slot = active_queue_head;
1293
1294 while (slot != NULL)
1295 if (slot->in_use) {
1296 run_active_slot(slot);
1297 slot = active_queue_head;
1298 } else {
1299 slot = slot->next;
1300 }
1301 }
1302
1303 /* Helpers for modifying and creating URLs */
1304 static inline int needs_quote(int ch)
1305 {
1306 if (((ch >= 'A') && (ch <= 'Z'))
1307 || ((ch >= 'a') && (ch <= 'z'))
1308 || ((ch >= '0') && (ch <= '9'))
1309 || (ch == '/')
1310 || (ch == '-')
1311 || (ch == '.'))
1312 return 0;
1313 return 1;
1314 }
1315
1316 static char *quote_ref_url(const char *base, const char *ref)
1317 {
1318 struct strbuf buf = STRBUF_INIT;
1319 const char *cp;
1320 int ch;
1321
1322 end_url_with_slash(&buf, base);
1323
1324 for (cp = ref; (ch = *cp) != 0; cp++)
1325 if (needs_quote(ch))
1326 strbuf_addf(&buf, "%%%02x", ch);
1327 else
1328 strbuf_addch(&buf, *cp);
1329
1330 return strbuf_detach(&buf, NULL);
1331 }
1332
1333 void append_remote_object_url(struct strbuf *buf, const char *url,
1334 const char *hex,
1335 int only_two_digit_prefix)
1336 {
1337 end_url_with_slash(buf, url);
1338
1339 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1340 if (!only_two_digit_prefix)
1341 strbuf_addstr(buf, hex + 2);
1342 }
1343
1344 char *get_remote_object_url(const char *url, const char *hex,
1345 int only_two_digit_prefix)
1346 {
1347 struct strbuf buf = STRBUF_INIT;
1348 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1349 return strbuf_detach(&buf, NULL);
1350 }
1351
1352 static int handle_curl_result(struct slot_results *results)
1353 {
1354 /*
1355 * If we see a failing http code with CURLE_OK, we have turned off
1356 * FAILONERROR (to keep the server's custom error response), and should
1357 * translate the code into failure here.
1358 *
1359 * Likewise, if we see a redirect (30x code), that means we turned off
1360 * redirect-following, and we should treat the result as an error.
1361 */
1362 if (results->curl_result == CURLE_OK &&
1363 results->http_code >= 300) {
1364 results->curl_result = CURLE_HTTP_RETURNED_ERROR;
1365 /*
1366 * Normally curl will already have put the "reason phrase"
1367 * from the server into curl_errorstr; unfortunately without
1368 * FAILONERROR it is lost, so we can give only the numeric
1369 * status code.
1370 */
1371 snprintf(curl_errorstr, sizeof(curl_errorstr),
1372 "The requested URL returned error: %ld",
1373 results->http_code);
1374 }
1375
1376 if (results->curl_result == CURLE_OK) {
1377 credential_approve(&http_auth);
1378 if (proxy_auth.password)
1379 credential_approve(&proxy_auth);
1380 return HTTP_OK;
1381 } else if (missing_target(results))
1382 return HTTP_MISSING_TARGET;
1383 else if (results->http_code == 401) {
1384 if (http_auth.username && http_auth.password) {
1385 credential_reject(&http_auth);
1386 return HTTP_NOAUTH;
1387 } else {
1388 #ifdef LIBCURL_CAN_HANDLE_AUTH_ANY
1389 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1390 if (results->auth_avail) {
1391 http_auth_methods &= results->auth_avail;
1392 http_auth_methods_restricted = 1;
1393 }
1394 #endif
1395 return HTTP_REAUTH;
1396 }
1397 } else {
1398 if (results->http_connectcode == 407)
1399 credential_reject(&proxy_auth);
1400 #if LIBCURL_VERSION_NUM >= 0x070c00
1401 if (!curl_errorstr[0])
1402 strlcpy(curl_errorstr,
1403 curl_easy_strerror(results->curl_result),
1404 sizeof(curl_errorstr));
1405 #endif
1406 return HTTP_ERROR;
1407 }
1408 }
1409
1410 int run_one_slot(struct active_request_slot *slot,
1411 struct slot_results *results)
1412 {
1413 slot->results = results;
1414 if (!start_active_slot(slot)) {
1415 snprintf(curl_errorstr, sizeof(curl_errorstr),
1416 "failed to start HTTP request");
1417 return HTTP_START_FAILED;
1418 }
1419
1420 run_active_slot(slot);
1421 return handle_curl_result(results);
1422 }
1423
1424 struct curl_slist *http_copy_default_headers(void)
1425 {
1426 struct curl_slist *headers = NULL, *h;
1427
1428 for (h = extra_http_headers; h; h = h->next)
1429 headers = curl_slist_append(headers, h->data);
1430
1431 return headers;
1432 }
1433
1434 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1435 {
1436 char *ptr;
1437 CURLcode ret;
1438
1439 strbuf_reset(buf);
1440 ret = curl_easy_getinfo(curl, info, &ptr);
1441 if (!ret && ptr)
1442 strbuf_addstr(buf, ptr);
1443 return ret;
1444 }
1445
1446 /*
1447 * Check for and extract a content-type parameter. "raw"
1448 * should be positioned at the start of the potential
1449 * parameter, with any whitespace already removed.
1450 *
1451 * "name" is the name of the parameter. The value is appended
1452 * to "out".
1453 */
1454 static int extract_param(const char *raw, const char *name,
1455 struct strbuf *out)
1456 {
1457 size_t len = strlen(name);
1458
1459 if (strncasecmp(raw, name, len))
1460 return -1;
1461 raw += len;
1462
1463 if (*raw != '=')
1464 return -1;
1465 raw++;
1466
1467 while (*raw && !isspace(*raw) && *raw != ';')
1468 strbuf_addch(out, *raw++);
1469 return 0;
1470 }
1471
1472 /*
1473 * Extract a normalized version of the content type, with any
1474 * spaces suppressed, all letters lowercased, and no trailing ";"
1475 * or parameters.
1476 *
1477 * Note that we will silently remove even invalid whitespace. For
1478 * example, "text / plain" is specifically forbidden by RFC 2616,
1479 * but "text/plain" is the only reasonable output, and this keeps
1480 * our code simple.
1481 *
1482 * If the "charset" argument is not NULL, store the value of any
1483 * charset parameter there.
1484 *
1485 * Example:
1486 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1487 * "text / plain" -> "text/plain"
1488 */
1489 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1490 struct strbuf *charset)
1491 {
1492 const char *p;
1493
1494 strbuf_reset(type);
1495 strbuf_grow(type, raw->len);
1496 for (p = raw->buf; *p; p++) {
1497 if (isspace(*p))
1498 continue;
1499 if (*p == ';') {
1500 p++;
1501 break;
1502 }
1503 strbuf_addch(type, tolower(*p));
1504 }
1505
1506 if (!charset)
1507 return;
1508
1509 strbuf_reset(charset);
1510 while (*p) {
1511 while (isspace(*p) || *p == ';')
1512 p++;
1513 if (!extract_param(p, "charset", charset))
1514 return;
1515 while (*p && !isspace(*p))
1516 p++;
1517 }
1518
1519 if (!charset->len && starts_with(type->buf, "text/"))
1520 strbuf_addstr(charset, "ISO-8859-1");
1521 }
1522
1523 static void write_accept_language(struct strbuf *buf)
1524 {
1525 /*
1526 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1527 * that, q-value will be smaller than 0.001, the minimum q-value the
1528 * HTTP specification allows. See
1529 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1530 */
1531 const int MAX_DECIMAL_PLACES = 3;
1532 const int MAX_LANGUAGE_TAGS = 1000;
1533 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1534 char **language_tags = NULL;
1535 int num_langs = 0;
1536 const char *s = get_preferred_languages();
1537 int i;
1538 struct strbuf tag = STRBUF_INIT;
1539
1540 /* Don't add Accept-Language header if no language is preferred. */
1541 if (!s)
1542 return;
1543
1544 /*
1545 * Split the colon-separated string of preferred languages into
1546 * language_tags array.
1547 */
1548 do {
1549 /* collect language tag */
1550 for (; *s && (isalnum(*s) || *s == '_'); s++)
1551 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1552
1553 /* skip .codeset, @modifier and any other unnecessary parts */
1554 while (*s && *s != ':')
1555 s++;
1556
1557 if (tag.len) {
1558 num_langs++;
1559 REALLOC_ARRAY(language_tags, num_langs);
1560 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1561 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1562 break;
1563 }
1564 } while (*s++);
1565
1566 /* write Accept-Language header into buf */
1567 if (num_langs) {
1568 int last_buf_len = 0;
1569 int max_q;
1570 int decimal_places;
1571 char q_format[32];
1572
1573 /* add '*' */
1574 REALLOC_ARRAY(language_tags, num_langs + 1);
1575 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1576
1577 /* compute decimal_places */
1578 for (max_q = 1, decimal_places = 0;
1579 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1580 decimal_places++, max_q *= 10)
1581 ;
1582
1583 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1584
1585 strbuf_addstr(buf, "Accept-Language: ");
1586
1587 for (i = 0; i < num_langs; i++) {
1588 if (i > 0)
1589 strbuf_addstr(buf, ", ");
1590
1591 strbuf_addstr(buf, language_tags[i]);
1592
1593 if (i > 0)
1594 strbuf_addf(buf, q_format, max_q - i);
1595
1596 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1597 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1598 break;
1599 }
1600
1601 last_buf_len = buf->len;
1602 }
1603 }
1604
1605 /* free language tags -- last one is a static '*' */
1606 for (i = 0; i < num_langs - 1; i++)
1607 free(language_tags[i]);
1608 free(language_tags);
1609 }
1610
1611 /*
1612 * Get an Accept-Language header which indicates user's preferred languages.
1613 *
1614 * Examples:
1615 * LANGUAGE= -> ""
1616 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1617 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1618 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1619 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1620 * LANGUAGE= LANG=C -> ""
1621 */
1622 static const char *get_accept_language(void)
1623 {
1624 if (!cached_accept_language) {
1625 struct strbuf buf = STRBUF_INIT;
1626 write_accept_language(&buf);
1627 if (buf.len > 0)
1628 cached_accept_language = strbuf_detach(&buf, NULL);
1629 }
1630
1631 return cached_accept_language;
1632 }
1633
1634 static void http_opt_request_remainder(CURL *curl, off_t pos)
1635 {
1636 char buf[128];
1637 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1638 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1639 }
1640
1641 /* http_request() targets */
1642 #define HTTP_REQUEST_STRBUF 0
1643 #define HTTP_REQUEST_FILE 1
1644
1645 static int http_request(const char *url,
1646 void *result, int target,
1647 const struct http_get_options *options)
1648 {
1649 struct active_request_slot *slot;
1650 struct slot_results results;
1651 struct curl_slist *headers = http_copy_default_headers();
1652 struct strbuf buf = STRBUF_INIT;
1653 const char *accept_language;
1654 int ret;
1655
1656 slot = get_active_slot();
1657 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1658
1659 if (result == NULL) {
1660 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1661 } else {
1662 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1663 curl_easy_setopt(slot->curl, CURLOPT_FILE, result);
1664
1665 if (target == HTTP_REQUEST_FILE) {
1666 off_t posn = ftello(result);
1667 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1668 fwrite);
1669 if (posn > 0)
1670 http_opt_request_remainder(slot->curl, posn);
1671 } else
1672 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1673 fwrite_buffer);
1674 }
1675
1676 accept_language = get_accept_language();
1677
1678 if (accept_language)
1679 headers = curl_slist_append(headers, accept_language);
1680
1681 strbuf_addstr(&buf, "Pragma:");
1682 if (options && options->no_cache)
1683 strbuf_addstr(&buf, " no-cache");
1684 if (options && options->keep_error)
1685 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1686 if (options && options->initial_request &&
1687 http_follow_config == HTTP_FOLLOW_INITIAL)
1688 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1689
1690 headers = curl_slist_append(headers, buf.buf);
1691
1692 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1693 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1694 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "gzip");
1695
1696 ret = run_one_slot(slot, &results);
1697
1698 if (options && options->content_type) {
1699 struct strbuf raw = STRBUF_INIT;
1700 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1701 extract_content_type(&raw, options->content_type,
1702 options->charset);
1703 strbuf_release(&raw);
1704 }
1705
1706 if (options && options->effective_url)
1707 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1708 options->effective_url);
1709
1710 curl_slist_free_all(headers);
1711 strbuf_release(&buf);
1712
1713 return ret;
1714 }
1715
1716 /*
1717 * Update the "base" url to a more appropriate value, as deduced by
1718 * redirects seen when requesting a URL starting with "url".
1719 *
1720 * The "asked" parameter is a URL that we asked curl to access, and must begin
1721 * with "base".
1722 *
1723 * The "got" parameter is the URL that curl reported to us as where we ended
1724 * up.
1725 *
1726 * Returns 1 if we updated the base url, 0 otherwise.
1727 *
1728 * Our basic strategy is to compare "base" and "asked" to find the bits
1729 * specific to our request. We then strip those bits off of "got" to yield the
1730 * new base. So for example, if our base is "http://example.com/foo.git",
1731 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1732 * with "https://other.example.com/foo.git/info/refs". We would want the
1733 * new URL to become "https://other.example.com/foo.git".
1734 *
1735 * Note that this assumes a sane redirect scheme. It's entirely possible
1736 * in the example above to end up at a URL that does not even end in
1737 * "info/refs". In such a case we die. There's not much we can do, such a
1738 * scheme is unlikely to represent a real git repository, and failing to
1739 * rewrite the base opens options for malicious redirects to do funny things.
1740 */
1741 static int update_url_from_redirect(struct strbuf *base,
1742 const char *asked,
1743 const struct strbuf *got)
1744 {
1745 const char *tail;
1746 size_t new_len;
1747
1748 if (!strcmp(asked, got->buf))
1749 return 0;
1750
1751 if (!skip_prefix(asked, base->buf, &tail))
1752 die("BUG: update_url_from_redirect: %s is not a superset of %s",
1753 asked, base->buf);
1754
1755 new_len = got->len;
1756 if (!strip_suffix_mem(got->buf, &new_len, tail))
1757 die(_("unable to update url base from redirection:\n"
1758 " asked for: %s\n"
1759 " redirect: %s"),
1760 asked, got->buf);
1761
1762 strbuf_reset(base);
1763 strbuf_add(base, got->buf, new_len);
1764
1765 return 1;
1766 }
1767
1768 static int http_request_reauth(const char *url,
1769 void *result, int target,
1770 struct http_get_options *options)
1771 {
1772 int ret = http_request(url, result, target, options);
1773
1774 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1775 return ret;
1776
1777 if (options && options->effective_url && options->base_url) {
1778 if (update_url_from_redirect(options->base_url,
1779 url, options->effective_url)) {
1780 credential_from_url(&http_auth, options->base_url->buf);
1781 url = options->effective_url->buf;
1782 }
1783 }
1784
1785 if (ret != HTTP_REAUTH)
1786 return ret;
1787
1788 /*
1789 * If we are using KEEP_ERROR, the previous request may have
1790 * put cruft into our output stream; we should clear it out before
1791 * making our next request. We only know how to do this for
1792 * the strbuf case, but that is enough to satisfy current callers.
1793 */
1794 if (options && options->keep_error) {
1795 switch (target) {
1796 case HTTP_REQUEST_STRBUF:
1797 strbuf_reset(result);
1798 break;
1799 default:
1800 die("BUG: HTTP_KEEP_ERROR is only supported with strbufs");
1801 }
1802 }
1803
1804 credential_fill(&http_auth);
1805
1806 return http_request(url, result, target, options);
1807 }
1808
1809 int http_get_strbuf(const char *url,
1810 struct strbuf *result,
1811 struct http_get_options *options)
1812 {
1813 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1814 }
1815
1816 /*
1817 * Downloads a URL and stores the result in the given file.
1818 *
1819 * If a previous interrupted download is detected (i.e. a previous temporary
1820 * file is still around) the download is resumed.
1821 */
1822 static int http_get_file(const char *url, const char *filename,
1823 struct http_get_options *options)
1824 {
1825 int ret;
1826 struct strbuf tmpfile = STRBUF_INIT;
1827 FILE *result;
1828
1829 strbuf_addf(&tmpfile, "%s.temp", filename);
1830 result = fopen(tmpfile.buf, "a");
1831 if (!result) {
1832 error("Unable to open local file %s", tmpfile.buf);
1833 ret = HTTP_ERROR;
1834 goto cleanup;
1835 }
1836
1837 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1838 fclose(result);
1839
1840 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1841 ret = HTTP_ERROR;
1842 cleanup:
1843 strbuf_release(&tmpfile);
1844 return ret;
1845 }
1846
1847 int http_fetch_ref(const char *base, struct ref *ref)
1848 {
1849 struct http_get_options options = {0};
1850 char *url;
1851 struct strbuf buffer = STRBUF_INIT;
1852 int ret = -1;
1853
1854 options.no_cache = 1;
1855
1856 url = quote_ref_url(base, ref->name);
1857 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1858 strbuf_rtrim(&buffer);
1859 if (buffer.len == 40)
1860 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1861 else if (starts_with(buffer.buf, "ref: ")) {
1862 ref->symref = xstrdup(buffer.buf + 5);
1863 ret = 0;
1864 }
1865 }
1866
1867 strbuf_release(&buffer);
1868 free(url);
1869 return ret;
1870 }
1871
1872 /* Helpers for fetching packs */
1873 static char *fetch_pack_index(unsigned char *sha1, const char *base_url)
1874 {
1875 char *url, *tmp;
1876 struct strbuf buf = STRBUF_INIT;
1877
1878 if (http_is_verbose)
1879 fprintf(stderr, "Getting index for pack %s\n", sha1_to_hex(sha1));
1880
1881 end_url_with_slash(&buf, base_url);
1882 strbuf_addf(&buf, "objects/pack/pack-%s.idx", sha1_to_hex(sha1));
1883 url = strbuf_detach(&buf, NULL);
1884
1885 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(sha1));
1886 tmp = strbuf_detach(&buf, NULL);
1887
1888 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
1889 error("Unable to get pack index %s", url);
1890 free(tmp);
1891 tmp = NULL;
1892 }
1893
1894 free(url);
1895 return tmp;
1896 }
1897
1898 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
1899 unsigned char *sha1, const char *base_url)
1900 {
1901 struct packed_git *new_pack;
1902 char *tmp_idx = NULL;
1903 int ret;
1904
1905 if (has_pack_index(sha1)) {
1906 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
1907 if (!new_pack)
1908 return -1; /* parse_pack_index() already issued error message */
1909 goto add_pack;
1910 }
1911
1912 tmp_idx = fetch_pack_index(sha1, base_url);
1913 if (!tmp_idx)
1914 return -1;
1915
1916 new_pack = parse_pack_index(sha1, tmp_idx);
1917 if (!new_pack) {
1918 unlink(tmp_idx);
1919 free(tmp_idx);
1920
1921 return -1; /* parse_pack_index() already issued error message */
1922 }
1923
1924 ret = verify_pack_index(new_pack);
1925 if (!ret) {
1926 close_pack_index(new_pack);
1927 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
1928 }
1929 free(tmp_idx);
1930 if (ret)
1931 return -1;
1932
1933 add_pack:
1934 new_pack->next = *packs_head;
1935 *packs_head = new_pack;
1936 return 0;
1937 }
1938
1939 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
1940 {
1941 struct http_get_options options = {0};
1942 int ret = 0, i = 0;
1943 char *url, *data;
1944 struct strbuf buf = STRBUF_INIT;
1945 unsigned char sha1[20];
1946
1947 end_url_with_slash(&buf, base_url);
1948 strbuf_addstr(&buf, "objects/info/packs");
1949 url = strbuf_detach(&buf, NULL);
1950
1951 options.no_cache = 1;
1952 ret = http_get_strbuf(url, &buf, &options);
1953 if (ret != HTTP_OK)
1954 goto cleanup;
1955
1956 data = buf.buf;
1957 while (i < buf.len) {
1958 switch (data[i]) {
1959 case 'P':
1960 i++;
1961 if (i + 52 <= buf.len &&
1962 starts_with(data + i, " pack-") &&
1963 starts_with(data + i + 46, ".pack\n")) {
1964 get_sha1_hex(data + i + 6, sha1);
1965 fetch_and_setup_pack_index(packs_head, sha1,
1966 base_url);
1967 i += 51;
1968 break;
1969 }
1970 default:
1971 while (i < buf.len && data[i] != '\n')
1972 i++;
1973 }
1974 i++;
1975 }
1976
1977 cleanup:
1978 free(url);
1979 return ret;
1980 }
1981
1982 void release_http_pack_request(struct http_pack_request *preq)
1983 {
1984 if (preq->packfile != NULL) {
1985 fclose(preq->packfile);
1986 preq->packfile = NULL;
1987 }
1988 preq->slot = NULL;
1989 free(preq->url);
1990 free(preq);
1991 }
1992
1993 int finish_http_pack_request(struct http_pack_request *preq)
1994 {
1995 struct packed_git **lst;
1996 struct packed_git *p = preq->target;
1997 char *tmp_idx;
1998 size_t len;
1999 struct child_process ip = CHILD_PROCESS_INIT;
2000 const char *ip_argv[8];
2001
2002 close_pack_index(p);
2003
2004 fclose(preq->packfile);
2005 preq->packfile = NULL;
2006
2007 lst = preq->lst;
2008 while (*lst != p)
2009 lst = &((*lst)->next);
2010 *lst = (*lst)->next;
2011
2012 if (!strip_suffix(preq->tmpfile, ".pack.temp", &len))
2013 die("BUG: pack tmpfile does not end in .pack.temp?");
2014 tmp_idx = xstrfmt("%.*s.idx.temp", (int)len, preq->tmpfile);
2015
2016 ip_argv[0] = "index-pack";
2017 ip_argv[1] = "-o";
2018 ip_argv[2] = tmp_idx;
2019 ip_argv[3] = preq->tmpfile;
2020 ip_argv[4] = NULL;
2021
2022 ip.argv = ip_argv;
2023 ip.git_cmd = 1;
2024 ip.no_stdin = 1;
2025 ip.no_stdout = 1;
2026
2027 if (run_command(&ip)) {
2028 unlink(preq->tmpfile);
2029 unlink(tmp_idx);
2030 free(tmp_idx);
2031 return -1;
2032 }
2033
2034 unlink(sha1_pack_index_name(p->sha1));
2035
2036 if (finalize_object_file(preq->tmpfile, sha1_pack_name(p->sha1))
2037 || finalize_object_file(tmp_idx, sha1_pack_index_name(p->sha1))) {
2038 free(tmp_idx);
2039 return -1;
2040 }
2041
2042 install_packed_git(p);
2043 free(tmp_idx);
2044 return 0;
2045 }
2046
2047 struct http_pack_request *new_http_pack_request(
2048 struct packed_git *target, const char *base_url)
2049 {
2050 off_t prev_posn = 0;
2051 struct strbuf buf = STRBUF_INIT;
2052 struct http_pack_request *preq;
2053
2054 preq = xcalloc(1, sizeof(*preq));
2055 preq->target = target;
2056
2057 end_url_with_slash(&buf, base_url);
2058 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2059 sha1_to_hex(target->sha1));
2060 preq->url = strbuf_detach(&buf, NULL);
2061
2062 snprintf(preq->tmpfile, sizeof(preq->tmpfile), "%s.temp",
2063 sha1_pack_name(target->sha1));
2064 preq->packfile = fopen(preq->tmpfile, "a");
2065 if (!preq->packfile) {
2066 error("Unable to open local file %s for pack",
2067 preq->tmpfile);
2068 goto abort;
2069 }
2070
2071 preq->slot = get_active_slot();
2072 curl_easy_setopt(preq->slot->curl, CURLOPT_FILE, preq->packfile);
2073 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2074 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2075 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2076 no_pragma_header);
2077
2078 /*
2079 * If there is data present from a previous transfer attempt,
2080 * resume where it left off
2081 */
2082 prev_posn = ftello(preq->packfile);
2083 if (prev_posn>0) {
2084 if (http_is_verbose)
2085 fprintf(stderr,
2086 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2087 sha1_to_hex(target->sha1), (uintmax_t)prev_posn);
2088 http_opt_request_remainder(preq->slot->curl, prev_posn);
2089 }
2090
2091 return preq;
2092
2093 abort:
2094 free(preq->url);
2095 free(preq);
2096 return NULL;
2097 }
2098
2099 /* Helpers for fetching objects (loose) */
2100 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2101 void *data)
2102 {
2103 unsigned char expn[4096];
2104 size_t size = eltsize * nmemb;
2105 int posn = 0;
2106 struct http_object_request *freq = data;
2107 struct active_request_slot *slot = freq->slot;
2108
2109 if (slot) {
2110 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2111 &slot->http_code);
2112 if (c != CURLE_OK)
2113 die("BUG: curl_easy_getinfo for HTTP code failed: %s",
2114 curl_easy_strerror(c));
2115 if (slot->http_code >= 300)
2116 return size;
2117 }
2118
2119 do {
2120 ssize_t retval = xwrite(freq->localfile,
2121 (char *) ptr + posn, size - posn);
2122 if (retval < 0)
2123 return posn;
2124 posn += retval;
2125 } while (posn < size);
2126
2127 freq->stream.avail_in = size;
2128 freq->stream.next_in = (void *)ptr;
2129 do {
2130 freq->stream.next_out = expn;
2131 freq->stream.avail_out = sizeof(expn);
2132 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2133 git_SHA1_Update(&freq->c, expn,
2134 sizeof(expn) - freq->stream.avail_out);
2135 } while (freq->stream.avail_in && freq->zret == Z_OK);
2136 return size;
2137 }
2138
2139 struct http_object_request *new_http_object_request(const char *base_url,
2140 unsigned char *sha1)
2141 {
2142 char *hex = sha1_to_hex(sha1);
2143 const char *filename;
2144 char prevfile[PATH_MAX];
2145 int prevlocal;
2146 char prev_buf[PREV_BUF_SIZE];
2147 ssize_t prev_read = 0;
2148 off_t prev_posn = 0;
2149 struct http_object_request *freq;
2150
2151 freq = xcalloc(1, sizeof(*freq));
2152 hashcpy(freq->sha1, sha1);
2153 freq->localfile = -1;
2154
2155 filename = sha1_file_name(sha1);
2156 snprintf(freq->tmpfile, sizeof(freq->tmpfile),
2157 "%s.temp", filename);
2158
2159 snprintf(prevfile, sizeof(prevfile), "%s.prev", filename);
2160 unlink_or_warn(prevfile);
2161 rename(freq->tmpfile, prevfile);
2162 unlink_or_warn(freq->tmpfile);
2163
2164 if (freq->localfile != -1)
2165 error("fd leakage in start: %d", freq->localfile);
2166 freq->localfile = open(freq->tmpfile,
2167 O_WRONLY | O_CREAT | O_EXCL, 0666);
2168 /*
2169 * This could have failed due to the "lazy directory creation";
2170 * try to mkdir the last path component.
2171 */
2172 if (freq->localfile < 0 && errno == ENOENT) {
2173 char *dir = strrchr(freq->tmpfile, '/');
2174 if (dir) {
2175 *dir = 0;
2176 mkdir(freq->tmpfile, 0777);
2177 *dir = '/';
2178 }
2179 freq->localfile = open(freq->tmpfile,
2180 O_WRONLY | O_CREAT | O_EXCL, 0666);
2181 }
2182
2183 if (freq->localfile < 0) {
2184 error_errno("Couldn't create temporary file %s", freq->tmpfile);
2185 goto abort;
2186 }
2187
2188 git_inflate_init(&freq->stream);
2189
2190 git_SHA1_Init(&freq->c);
2191
2192 freq->url = get_remote_object_url(base_url, hex, 0);
2193
2194 /*
2195 * If a previous temp file is present, process what was already
2196 * fetched.
2197 */
2198 prevlocal = open(prevfile, O_RDONLY);
2199 if (prevlocal != -1) {
2200 do {
2201 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2202 if (prev_read>0) {
2203 if (fwrite_sha1_file(prev_buf,
2204 1,
2205 prev_read,
2206 freq) == prev_read) {
2207 prev_posn += prev_read;
2208 } else {
2209 prev_read = -1;
2210 }
2211 }
2212 } while (prev_read > 0);
2213 close(prevlocal);
2214 }
2215 unlink_or_warn(prevfile);
2216
2217 /*
2218 * Reset inflate/SHA1 if there was an error reading the previous temp
2219 * file; also rewind to the beginning of the local file.
2220 */
2221 if (prev_read == -1) {
2222 memset(&freq->stream, 0, sizeof(freq->stream));
2223 git_inflate_init(&freq->stream);
2224 git_SHA1_Init(&freq->c);
2225 if (prev_posn>0) {
2226 prev_posn = 0;
2227 lseek(freq->localfile, 0, SEEK_SET);
2228 if (ftruncate(freq->localfile, 0) < 0) {
2229 error_errno("Couldn't truncate temporary file %s",
2230 freq->tmpfile);
2231 goto abort;
2232 }
2233 }
2234 }
2235
2236 freq->slot = get_active_slot();
2237
2238 curl_easy_setopt(freq->slot->curl, CURLOPT_FILE, freq);
2239 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2240 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2241 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2242 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2243 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2244
2245 /*
2246 * If we have successfully processed data from a previous fetch
2247 * attempt, only fetch the data we don't already have.
2248 */
2249 if (prev_posn>0) {
2250 if (http_is_verbose)
2251 fprintf(stderr,
2252 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2253 hex, (uintmax_t)prev_posn);
2254 http_opt_request_remainder(freq->slot->curl, prev_posn);
2255 }
2256
2257 return freq;
2258
2259 abort:
2260 free(freq->url);
2261 free(freq);
2262 return NULL;
2263 }
2264
2265 void process_http_object_request(struct http_object_request *freq)
2266 {
2267 if (freq->slot == NULL)
2268 return;
2269 freq->curl_result = freq->slot->curl_result;
2270 freq->http_code = freq->slot->http_code;
2271 freq->slot = NULL;
2272 }
2273
2274 int finish_http_object_request(struct http_object_request *freq)
2275 {
2276 struct stat st;
2277
2278 close(freq->localfile);
2279 freq->localfile = -1;
2280
2281 process_http_object_request(freq);
2282
2283 if (freq->http_code == 416) {
2284 warning("requested range invalid; we may already have all the data.");
2285 } else if (freq->curl_result != CURLE_OK) {
2286 if (stat(freq->tmpfile, &st) == 0)
2287 if (st.st_size == 0)
2288 unlink_or_warn(freq->tmpfile);
2289 return -1;
2290 }
2291
2292 git_inflate_end(&freq->stream);
2293 git_SHA1_Final(freq->real_sha1, &freq->c);
2294 if (freq->zret != Z_STREAM_END) {
2295 unlink_or_warn(freq->tmpfile);
2296 return -1;
2297 }
2298 if (hashcmp(freq->sha1, freq->real_sha1)) {
2299 unlink_or_warn(freq->tmpfile);
2300 return -1;
2301 }
2302 freq->rename =
2303 finalize_object_file(freq->tmpfile, sha1_file_name(freq->sha1));
2304
2305 return freq->rename;
2306 }
2307
2308 void abort_http_object_request(struct http_object_request *freq)
2309 {
2310 unlink_or_warn(freq->tmpfile);
2311
2312 release_http_object_request(freq);
2313 }
2314
2315 void release_http_object_request(struct http_object_request *freq)
2316 {
2317 if (freq->localfile != -1) {
2318 close(freq->localfile);
2319 freq->localfile = -1;
2320 }
2321 if (freq->url != NULL) {
2322 free(freq->url);
2323 freq->url = NULL;
2324 }
2325 if (freq->slot != NULL) {
2326 freq->slot->callback_func = NULL;
2327 freq->slot->callback_data = NULL;
2328 release_active_slot(freq->slot);
2329 freq->slot = NULL;
2330 }
2331 }
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