1 #include "git-compat-util.h"
2 #include "git-curl-compat.h"
3 #include "http.h"
4 #include "config.h"
5 #include "pack.h"
6 #include "sideband.h"
7 #include "run-command.h"
8 #include "url.h"
9 #include "urlmatch.h"
10 #include "credential.h"
11 #include "version.h"
12 #include "pkt-line.h"
13 #include "gettext.h"
14 #include "transport.h"
15 #include "packfile.h"
16 #include "protocol.h"
17 #include "string-list.h"
18 #include "object-store.h"
19
20 static struct trace_key trace_curl = TRACE_KEY_INIT(CURL);
21 static int trace_curl_data = 1;
22 static int trace_curl_redact = 1;
23 long int git_curl_ipresolve = CURL_IPRESOLVE_WHATEVER;
24 int active_requests;
25 int http_is_verbose;
26 ssize_t http_post_buffer = 16 * LARGE_PACKET_MAX;
27
28 static int min_curl_sessions = 1;
29 static int curl_session_count;
30 static int max_requests = -1;
31 static CURLM *curlm;
32 static CURL *curl_default;
33
34 #define PREV_BUF_SIZE 4096
35
36 char curl_errorstr[CURL_ERROR_SIZE];
37
38 static int curl_ssl_verify = -1;
39 static int curl_ssl_try;
40 static const char *curl_http_version = NULL;
41 static const char *ssl_cert;
42 static const char *ssl_cipherlist;
43 static const char *ssl_version;
44 static struct {
45 const char *name;
46 long ssl_version;
47 } sslversions[] = {
48 { "sslv2", CURL_SSLVERSION_SSLv2 },
49 { "sslv3", CURL_SSLVERSION_SSLv3 },
50 { "tlsv1", CURL_SSLVERSION_TLSv1 },
51 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_0
52 { "tlsv1.0", CURL_SSLVERSION_TLSv1_0 },
53 { "tlsv1.1", CURL_SSLVERSION_TLSv1_1 },
54 { "tlsv1.2", CURL_SSLVERSION_TLSv1_2 },
55 #endif
56 #ifdef GIT_CURL_HAVE_CURL_SSLVERSION_TLSv1_3
57 { "tlsv1.3", CURL_SSLVERSION_TLSv1_3 },
58 #endif
59 };
60 static const char *ssl_key;
61 static const char *ssl_capath;
62 static const char *curl_no_proxy;
63 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
64 static const char *ssl_pinnedkey;
65 #endif
66 static const char *ssl_cainfo;
67 static long curl_low_speed_limit = -1;
68 static long curl_low_speed_time = -1;
69 static int curl_ftp_no_epsv;
70 static const char *curl_http_proxy;
71 static const char *http_proxy_authmethod;
72
73 static const char *http_proxy_ssl_cert;
74 static const char *http_proxy_ssl_key;
75 static const char *http_proxy_ssl_ca_info;
76 static struct credential proxy_cert_auth = CREDENTIAL_INIT;
77 static int proxy_ssl_cert_password_required;
78
79 static struct {
80 const char *name;
81 long curlauth_param;
82 } proxy_authmethods[] = {
83 { "basic", CURLAUTH_BASIC },
84 { "digest", CURLAUTH_DIGEST },
85 { "negotiate", CURLAUTH_GSSNEGOTIATE },
86 { "ntlm", CURLAUTH_NTLM },
87 { "anyauth", CURLAUTH_ANY },
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 #ifdef CURLGSSAPI_DELEGATION_FLAG
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 static struct credential cert_auth = CREDENTIAL_INIT;
118 static int ssl_cert_password_required;
119 static unsigned long http_auth_methods = CURLAUTH_ANY;
120 static int http_auth_methods_restricted;
121 /* Modes for which empty_auth cannot actually help us. */
122 static unsigned long empty_auth_useless =
123 CURLAUTH_BASIC
124 | CURLAUTH_DIGEST_IE
125 | CURLAUTH_DIGEST;
126
127 static struct curl_slist *pragma_header;
128 static struct curl_slist *no_pragma_header;
129 static struct string_list extra_http_headers = STRING_LIST_INIT_DUP;
130
131 static struct active_request_slot *active_queue_head;
132
133 static char *cached_accept_language;
134
135 static char *http_ssl_backend;
136
137 static int http_schannel_check_revoke = 1;
138 /*
139 * With the backend being set to `schannel`, setting sslCAinfo would override
140 * the Certificate Store in cURL v7.60.0 and later, which is not what we want
141 * by default.
142 */
143 static int http_schannel_use_ssl_cainfo;
144
fread_buffer(char * ptr,size_t eltsize,size_t nmemb,void * buffer_)145 size_t fread_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
146 {
147 size_t size = eltsize * nmemb;
148 struct buffer *buffer = buffer_;
149
150 if (size > buffer->buf.len - buffer->posn)
151 size = buffer->buf.len - buffer->posn;
152 memcpy(ptr, buffer->buf.buf + buffer->posn, size);
153 buffer->posn += size;
154
155 return size / eltsize;
156 }
157
ioctl_buffer(CURL * handle,int cmd,void * clientp)158 curlioerr ioctl_buffer(CURL *handle, int cmd, void *clientp)
159 {
160 struct buffer *buffer = clientp;
161
162 switch (cmd) {
163 case CURLIOCMD_NOP:
164 return CURLIOE_OK;
165
166 case CURLIOCMD_RESTARTREAD:
167 buffer->posn = 0;
168 return CURLIOE_OK;
169
170 default:
171 return CURLIOE_UNKNOWNCMD;
172 }
173 }
174
fwrite_buffer(char * ptr,size_t eltsize,size_t nmemb,void * buffer_)175 size_t fwrite_buffer(char *ptr, size_t eltsize, size_t nmemb, void *buffer_)
176 {
177 size_t size = eltsize * nmemb;
178 struct strbuf *buffer = buffer_;
179
180 strbuf_add(buffer, ptr, size);
181 return nmemb;
182 }
183
fwrite_null(char * ptr,size_t eltsize,size_t nmemb,void * strbuf)184 size_t fwrite_null(char *ptr, size_t eltsize, size_t nmemb, void *strbuf)
185 {
186 return nmemb;
187 }
188
closedown_active_slot(struct active_request_slot * slot)189 static void closedown_active_slot(struct active_request_slot *slot)
190 {
191 active_requests--;
192 slot->in_use = 0;
193 }
194
finish_active_slot(struct active_request_slot * slot)195 static void finish_active_slot(struct active_request_slot *slot)
196 {
197 closedown_active_slot(slot);
198 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE, &slot->http_code);
199
200 if (slot->finished != NULL)
201 (*slot->finished) = 1;
202
203 /* Store slot results so they can be read after the slot is reused */
204 if (slot->results != NULL) {
205 slot->results->curl_result = slot->curl_result;
206 slot->results->http_code = slot->http_code;
207 curl_easy_getinfo(slot->curl, CURLINFO_HTTPAUTH_AVAIL,
208 &slot->results->auth_avail);
209
210 curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CONNECTCODE,
211 &slot->results->http_connectcode);
212 }
213
214 /* Run callback if appropriate */
215 if (slot->callback_func != NULL)
216 slot->callback_func(slot->callback_data);
217 }
218
xmulti_remove_handle(struct active_request_slot * slot)219 static void xmulti_remove_handle(struct active_request_slot *slot)
220 {
221 curl_multi_remove_handle(curlm, slot->curl);
222 }
223
process_curl_messages(void)224 static void process_curl_messages(void)
225 {
226 int num_messages;
227 struct active_request_slot *slot;
228 CURLMsg *curl_message = curl_multi_info_read(curlm, &num_messages);
229
230 while (curl_message != NULL) {
231 if (curl_message->msg == CURLMSG_DONE) {
232 int curl_result = curl_message->data.result;
233 slot = active_queue_head;
234 while (slot != NULL &&
235 slot->curl != curl_message->easy_handle)
236 slot = slot->next;
237 if (slot != NULL) {
238 xmulti_remove_handle(slot);
239 slot->curl_result = curl_result;
240 finish_active_slot(slot);
241 } else {
242 fprintf(stderr, "Received DONE message for unknown request!\n");
243 }
244 } else {
245 fprintf(stderr, "Unknown CURL message received: %d\n",
246 (int)curl_message->msg);
247 }
248 curl_message = curl_multi_info_read(curlm, &num_messages);
249 }
250 }
251
http_options(const char * var,const char * value,void * cb)252 static int http_options(const char *var, const char *value, void *cb)
253 {
254 if (!strcmp("http.version", var)) {
255 return git_config_string(&curl_http_version, var, value);
256 }
257 if (!strcmp("http.sslverify", var)) {
258 curl_ssl_verify = git_config_bool(var, value);
259 return 0;
260 }
261 if (!strcmp("http.sslcipherlist", var))
262 return git_config_string(&ssl_cipherlist, var, value);
263 if (!strcmp("http.sslversion", var))
264 return git_config_string(&ssl_version, var, value);
265 if (!strcmp("http.sslcert", var))
266 return git_config_pathname(&ssl_cert, var, value);
267 if (!strcmp("http.sslkey", var))
268 return git_config_pathname(&ssl_key, var, value);
269 if (!strcmp("http.sslcapath", var))
270 return git_config_pathname(&ssl_capath, var, value);
271 if (!strcmp("http.sslcainfo", var))
272 return git_config_pathname(&ssl_cainfo, var, value);
273 if (!strcmp("http.sslcertpasswordprotected", var)) {
274 ssl_cert_password_required = git_config_bool(var, value);
275 return 0;
276 }
277 if (!strcmp("http.ssltry", var)) {
278 curl_ssl_try = git_config_bool(var, value);
279 return 0;
280 }
281 if (!strcmp("http.sslbackend", var)) {
282 free(http_ssl_backend);
283 http_ssl_backend = xstrdup_or_null(value);
284 return 0;
285 }
286
287 if (!strcmp("http.schannelcheckrevoke", var)) {
288 http_schannel_check_revoke = git_config_bool(var, value);
289 return 0;
290 }
291
292 if (!strcmp("http.schannelusesslcainfo", var)) {
293 http_schannel_use_ssl_cainfo = git_config_bool(var, value);
294 return 0;
295 }
296
297 if (!strcmp("http.minsessions", var)) {
298 min_curl_sessions = git_config_int(var, value);
299 if (min_curl_sessions > 1)
300 min_curl_sessions = 1;
301 return 0;
302 }
303 if (!strcmp("http.maxrequests", var)) {
304 max_requests = git_config_int(var, value);
305 return 0;
306 }
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.proxysslcert", var))
327 return git_config_string(&http_proxy_ssl_cert, var, value);
328
329 if (!strcmp("http.proxysslkey", var))
330 return git_config_string(&http_proxy_ssl_key, var, value);
331
332 if (!strcmp("http.proxysslcainfo", var))
333 return git_config_string(&http_proxy_ssl_ca_info, var, value);
334
335 if (!strcmp("http.proxysslcertpasswordprotected", var)) {
336 proxy_ssl_cert_password_required = git_config_bool(var, value);
337 return 0;
338 }
339
340 if (!strcmp("http.cookiefile", var))
341 return git_config_pathname(&curl_cookie_file, var, value);
342 if (!strcmp("http.savecookies", var)) {
343 curl_save_cookies = git_config_bool(var, value);
344 return 0;
345 }
346
347 if (!strcmp("http.postbuffer", var)) {
348 http_post_buffer = git_config_ssize_t(var, value);
349 if (http_post_buffer < 0)
350 warning(_("negative value for http.postbuffer; defaulting to %d"), LARGE_PACKET_MAX);
351 if (http_post_buffer < LARGE_PACKET_MAX)
352 http_post_buffer = LARGE_PACKET_MAX;
353 return 0;
354 }
355
356 if (!strcmp("http.useragent", var))
357 return git_config_string(&user_agent, var, value);
358
359 if (!strcmp("http.emptyauth", var)) {
360 if (value && !strcmp("auto", value))
361 curl_empty_auth = -1;
362 else
363 curl_empty_auth = git_config_bool(var, value);
364 return 0;
365 }
366
367 if (!strcmp("http.delegation", var)) {
368 #ifdef CURLGSSAPI_DELEGATION_FLAG
369 return git_config_string(&curl_deleg, var, value);
370 #else
371 warning(_("Delegation control is not supported with cURL < 7.22.0"));
372 return 0;
373 #endif
374 }
375
376 if (!strcmp("http.pinnedpubkey", var)) {
377 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
378 return git_config_pathname(&ssl_pinnedkey, var, value);
379 #else
380 warning(_("Public key pinning not supported with cURL < 7.39.0"));
381 return 0;
382 #endif
383 }
384
385 if (!strcmp("http.extraheader", var)) {
386 if (!value) {
387 return config_error_nonbool(var);
388 } else if (!*value) {
389 string_list_clear(&extra_http_headers, 0);
390 } else {
391 string_list_append(&extra_http_headers, value);
392 }
393 return 0;
394 }
395
396 if (!strcmp("http.followredirects", var)) {
397 if (value && !strcmp(value, "initial"))
398 http_follow_config = HTTP_FOLLOW_INITIAL;
399 else if (git_config_bool(var, value))
400 http_follow_config = HTTP_FOLLOW_ALWAYS;
401 else
402 http_follow_config = HTTP_FOLLOW_NONE;
403 return 0;
404 }
405
406 /* Fall back on the default ones */
407 return git_default_config(var, value, cb);
408 }
409
curl_empty_auth_enabled(void)410 static int curl_empty_auth_enabled(void)
411 {
412 if (curl_empty_auth >= 0)
413 return curl_empty_auth;
414
415 /*
416 * In the automatic case, kick in the empty-auth
417 * hack as long as we would potentially try some
418 * method more exotic than "Basic" or "Digest".
419 *
420 * But only do this when this is our second or
421 * subsequent request, as by then we know what
422 * methods are available.
423 */
424 if (http_auth_methods_restricted &&
425 (http_auth_methods & ~empty_auth_useless))
426 return 1;
427 return 0;
428 }
429
init_curl_http_auth(CURL * result)430 static void init_curl_http_auth(CURL *result)
431 {
432 if (!http_auth.username || !*http_auth.username) {
433 if (curl_empty_auth_enabled())
434 curl_easy_setopt(result, CURLOPT_USERPWD, ":");
435 return;
436 }
437
438 credential_fill(&http_auth);
439
440 curl_easy_setopt(result, CURLOPT_USERNAME, http_auth.username);
441 curl_easy_setopt(result, CURLOPT_PASSWORD, http_auth.password);
442 }
443
444 /* *var must be free-able */
var_override(const char ** var,char * value)445 static void var_override(const char **var, char *value)
446 {
447 if (value) {
448 free((void *)*var);
449 *var = xstrdup(value);
450 }
451 }
452
set_proxyauth_name_password(CURL * result)453 static void set_proxyauth_name_password(CURL *result)
454 {
455 curl_easy_setopt(result, CURLOPT_PROXYUSERNAME,
456 proxy_auth.username);
457 curl_easy_setopt(result, CURLOPT_PROXYPASSWORD,
458 proxy_auth.password);
459 }
460
init_curl_proxy_auth(CURL * result)461 static void init_curl_proxy_auth(CURL *result)
462 {
463 if (proxy_auth.username) {
464 if (!proxy_auth.password)
465 credential_fill(&proxy_auth);
466 set_proxyauth_name_password(result);
467 }
468
469 var_override(&http_proxy_authmethod, getenv("GIT_HTTP_PROXY_AUTHMETHOD"));
470
471 if (http_proxy_authmethod) {
472 int i;
473 for (i = 0; i < ARRAY_SIZE(proxy_authmethods); i++) {
474 if (!strcmp(http_proxy_authmethod, proxy_authmethods[i].name)) {
475 curl_easy_setopt(result, CURLOPT_PROXYAUTH,
476 proxy_authmethods[i].curlauth_param);
477 break;
478 }
479 }
480 if (i == ARRAY_SIZE(proxy_authmethods)) {
481 warning("unsupported proxy authentication method %s: using anyauth",
482 http_proxy_authmethod);
483 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
484 }
485 }
486 else
487 curl_easy_setopt(result, CURLOPT_PROXYAUTH, CURLAUTH_ANY);
488 }
489
has_cert_password(void)490 static int has_cert_password(void)
491 {
492 if (ssl_cert == NULL || ssl_cert_password_required != 1)
493 return 0;
494 if (!cert_auth.password) {
495 cert_auth.protocol = xstrdup("cert");
496 cert_auth.host = xstrdup("");
497 cert_auth.username = xstrdup("");
498 cert_auth.path = xstrdup(ssl_cert);
499 credential_fill(&cert_auth);
500 }
501 return 1;
502 }
503
504 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
has_proxy_cert_password(void)505 static int has_proxy_cert_password(void)
506 {
507 if (http_proxy_ssl_cert == NULL || proxy_ssl_cert_password_required != 1)
508 return 0;
509 if (!proxy_cert_auth.password) {
510 proxy_cert_auth.protocol = xstrdup("cert");
511 proxy_cert_auth.host = xstrdup("");
512 proxy_cert_auth.username = xstrdup("");
513 proxy_cert_auth.path = xstrdup(http_proxy_ssl_cert);
514 credential_fill(&proxy_cert_auth);
515 }
516 return 1;
517 }
518 #endif
519
520 #ifdef GITCURL_HAVE_CURLOPT_TCP_KEEPALIVE
set_curl_keepalive(CURL * c)521 static void set_curl_keepalive(CURL *c)
522 {
523 curl_easy_setopt(c, CURLOPT_TCP_KEEPALIVE, 1);
524 }
525
526 #else
sockopt_callback(void * client,curl_socket_t fd,curlsocktype type)527 static int sockopt_callback(void *client, curl_socket_t fd, curlsocktype type)
528 {
529 int ka = 1;
530 int rc;
531 socklen_t len = (socklen_t)sizeof(ka);
532
533 if (type != CURLSOCKTYPE_IPCXN)
534 return 0;
535
536 rc = setsockopt(fd, SOL_SOCKET, SO_KEEPALIVE, (void *)&ka, len);
537 if (rc < 0)
538 warning_errno("unable to set SO_KEEPALIVE on socket");
539
540 return CURL_SOCKOPT_OK;
541 }
542
set_curl_keepalive(CURL * c)543 static void set_curl_keepalive(CURL *c)
544 {
545 curl_easy_setopt(c, CURLOPT_SOCKOPTFUNCTION, sockopt_callback);
546 }
547 #endif
548
redact_sensitive_header(struct strbuf * header)549 static void redact_sensitive_header(struct strbuf *header)
550 {
551 const char *sensitive_header;
552
553 if (trace_curl_redact &&
554 (skip_iprefix(header->buf, "Authorization:", &sensitive_header) ||
555 skip_iprefix(header->buf, "Proxy-Authorization:", &sensitive_header))) {
556 /* The first token is the type, which is OK to log */
557 while (isspace(*sensitive_header))
558 sensitive_header++;
559 while (*sensitive_header && !isspace(*sensitive_header))
560 sensitive_header++;
561 /* Everything else is opaque and possibly sensitive */
562 strbuf_setlen(header, sensitive_header - header->buf);
563 strbuf_addstr(header, " <redacted>");
564 } else if (trace_curl_redact &&
565 skip_iprefix(header->buf, "Cookie:", &sensitive_header)) {
566 struct strbuf redacted_header = STRBUF_INIT;
567 const char *cookie;
568
569 while (isspace(*sensitive_header))
570 sensitive_header++;
571
572 cookie = sensitive_header;
573
574 while (cookie) {
575 char *equals;
576 char *semicolon = strstr(cookie, "; ");
577 if (semicolon)
578 *semicolon = 0;
579 equals = strchrnul(cookie, '=');
580 if (!equals) {
581 /* invalid cookie, just append and continue */
582 strbuf_addstr(&redacted_header, cookie);
583 continue;
584 }
585 strbuf_add(&redacted_header, cookie, equals - cookie);
586 strbuf_addstr(&redacted_header, "=<redacted>");
587 if (semicolon) {
588 /*
589 * There are more cookies. (Or, for some
590 * reason, the input string ends in "; ".)
591 */
592 strbuf_addstr(&redacted_header, "; ");
593 cookie = semicolon + strlen("; ");
594 } else {
595 cookie = NULL;
596 }
597 }
598
599 strbuf_setlen(header, sensitive_header - header->buf);
600 strbuf_addbuf(header, &redacted_header);
601 }
602 }
603
curl_dump_header(const char * text,unsigned char * ptr,size_t size,int hide_sensitive_header)604 static void curl_dump_header(const char *text, unsigned char *ptr, size_t size, int hide_sensitive_header)
605 {
606 struct strbuf out = STRBUF_INIT;
607 struct strbuf **headers, **header;
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 strbuf_reset(&out);
613 strbuf_add(&out, ptr, size);
614 headers = strbuf_split_max(&out, '\n', 0);
615
616 for (header = headers; *header; header++) {
617 if (hide_sensitive_header)
618 redact_sensitive_header(*header);
619 strbuf_insertstr((*header), 0, text);
620 strbuf_insertstr((*header), strlen(text), ": ");
621 strbuf_rtrim((*header));
622 strbuf_addch((*header), '\n');
623 trace_strbuf(&trace_curl, (*header));
624 }
625 strbuf_list_free(headers);
626 strbuf_release(&out);
627 }
628
curl_dump_data(const char * text,unsigned char * ptr,size_t size)629 static void curl_dump_data(const char *text, unsigned char *ptr, size_t size)
630 {
631 size_t i;
632 struct strbuf out = STRBUF_INIT;
633 unsigned int width = 60;
634
635 strbuf_addf(&out, "%s, %10.10ld bytes (0x%8.8lx)\n",
636 text, (long)size, (long)size);
637 trace_strbuf(&trace_curl, &out);
638
639 for (i = 0; i < size; i += width) {
640 size_t w;
641
642 strbuf_reset(&out);
643 strbuf_addf(&out, "%s: ", text);
644 for (w = 0; (w < width) && (i + w < size); w++) {
645 unsigned char ch = ptr[i + w];
646
647 strbuf_addch(&out,
648 (ch >= 0x20) && (ch < 0x80)
649 ? ch : '.');
650 }
651 strbuf_addch(&out, '\n');
652 trace_strbuf(&trace_curl, &out);
653 }
654 strbuf_release(&out);
655 }
656
curl_trace(CURL * handle,curl_infotype type,char * data,size_t size,void * userp)657 static int curl_trace(CURL *handle, curl_infotype type, char *data, size_t size, void *userp)
658 {
659 const char *text;
660 enum { NO_FILTER = 0, DO_FILTER = 1 };
661
662 switch (type) {
663 case CURLINFO_TEXT:
664 trace_printf_key(&trace_curl, "== Info: %s", data);
665 break;
666 case CURLINFO_HEADER_OUT:
667 text = "=> Send header";
668 curl_dump_header(text, (unsigned char *)data, size, DO_FILTER);
669 break;
670 case CURLINFO_DATA_OUT:
671 if (trace_curl_data) {
672 text = "=> Send data";
673 curl_dump_data(text, (unsigned char *)data, size);
674 }
675 break;
676 case CURLINFO_SSL_DATA_OUT:
677 if (trace_curl_data) {
678 text = "=> Send SSL data";
679 curl_dump_data(text, (unsigned char *)data, size);
680 }
681 break;
682 case CURLINFO_HEADER_IN:
683 text = "<= Recv header";
684 curl_dump_header(text, (unsigned char *)data, size, NO_FILTER);
685 break;
686 case CURLINFO_DATA_IN:
687 if (trace_curl_data) {
688 text = "<= Recv data";
689 curl_dump_data(text, (unsigned char *)data, size);
690 }
691 break;
692 case CURLINFO_SSL_DATA_IN:
693 if (trace_curl_data) {
694 text = "<= Recv SSL data";
695 curl_dump_data(text, (unsigned char *)data, size);
696 }
697 break;
698
699 default: /* we ignore unknown types by default */
700 return 0;
701 }
702 return 0;
703 }
704
http_trace_curl_no_data(void)705 void http_trace_curl_no_data(void)
706 {
707 trace_override_envvar(&trace_curl, "1");
708 trace_curl_data = 0;
709 }
710
setup_curl_trace(CURL * handle)711 void setup_curl_trace(CURL *handle)
712 {
713 if (!trace_want(&trace_curl))
714 return;
715 curl_easy_setopt(handle, CURLOPT_VERBOSE, 1L);
716 curl_easy_setopt(handle, CURLOPT_DEBUGFUNCTION, curl_trace);
717 curl_easy_setopt(handle, CURLOPT_DEBUGDATA, NULL);
718 }
719
get_curl_allowed_protocols(int from_user)720 static long get_curl_allowed_protocols(int from_user)
721 {
722 long allowed_protocols = 0;
723
724 if (is_transport_allowed("http", from_user))
725 allowed_protocols |= CURLPROTO_HTTP;
726 if (is_transport_allowed("https", from_user))
727 allowed_protocols |= CURLPROTO_HTTPS;
728 if (is_transport_allowed("ftp", from_user))
729 allowed_protocols |= CURLPROTO_FTP;
730 if (is_transport_allowed("ftps", from_user))
731 allowed_protocols |= CURLPROTO_FTPS;
732
733 return allowed_protocols;
734 }
735
736 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
get_curl_http_version_opt(const char * version_string,long * opt)737 static int get_curl_http_version_opt(const char *version_string, long *opt)
738 {
739 int i;
740 static struct {
741 const char *name;
742 long opt_token;
743 } choice[] = {
744 { "HTTP/1.1", CURL_HTTP_VERSION_1_1 },
745 { "HTTP/2", CURL_HTTP_VERSION_2 }
746 };
747
748 for (i = 0; i < ARRAY_SIZE(choice); i++) {
749 if (!strcmp(version_string, choice[i].name)) {
750 *opt = choice[i].opt_token;
751 return 0;
752 }
753 }
754
755 warning("unknown value given to http.version: '%s'", version_string);
756 return -1; /* not found */
757 }
758
759 #endif
760
get_curl_handle(void)761 static CURL *get_curl_handle(void)
762 {
763 CURL *result = curl_easy_init();
764
765 if (!result)
766 die("curl_easy_init failed");
767
768 if (!curl_ssl_verify) {
769 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 0);
770 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 0);
771 } else {
772 /* Verify authenticity of the peer's certificate */
773 curl_easy_setopt(result, CURLOPT_SSL_VERIFYPEER, 1);
774 /* The name in the cert must match whom we tried to connect */
775 curl_easy_setopt(result, CURLOPT_SSL_VERIFYHOST, 2);
776 }
777
778 #ifdef GIT_CURL_HAVE_CURL_HTTP_VERSION_2
779 if (curl_http_version) {
780 long opt;
781 if (!get_curl_http_version_opt(curl_http_version, &opt)) {
782 /* Set request use http version */
783 curl_easy_setopt(result, CURLOPT_HTTP_VERSION, opt);
784 }
785 }
786 #endif
787
788 curl_easy_setopt(result, CURLOPT_NETRC, CURL_NETRC_OPTIONAL);
789 curl_easy_setopt(result, CURLOPT_HTTPAUTH, CURLAUTH_ANY);
790
791 #ifdef CURLGSSAPI_DELEGATION_FLAG
792 if (curl_deleg) {
793 int i;
794 for (i = 0; i < ARRAY_SIZE(curl_deleg_levels); i++) {
795 if (!strcmp(curl_deleg, curl_deleg_levels[i].name)) {
796 curl_easy_setopt(result, CURLOPT_GSSAPI_DELEGATION,
797 curl_deleg_levels[i].curl_deleg_param);
798 break;
799 }
800 }
801 if (i == ARRAY_SIZE(curl_deleg_levels))
802 warning("Unknown delegation method '%s': using default",
803 curl_deleg);
804 }
805 #endif
806
807 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
808 !http_schannel_check_revoke) {
809 #ifdef GIT_CURL_HAVE_CURLSSLOPT_NO_REVOKE
810 curl_easy_setopt(result, CURLOPT_SSL_OPTIONS, CURLSSLOPT_NO_REVOKE);
811 #else
812 warning(_("CURLSSLOPT_NO_REVOKE not supported with cURL < 7.44.0"));
813 #endif
814 }
815
816 if (http_proactive_auth)
817 init_curl_http_auth(result);
818
819 if (getenv("GIT_SSL_VERSION"))
820 ssl_version = getenv("GIT_SSL_VERSION");
821 if (ssl_version && *ssl_version) {
822 int i;
823 for (i = 0; i < ARRAY_SIZE(sslversions); i++) {
824 if (!strcmp(ssl_version, sslversions[i].name)) {
825 curl_easy_setopt(result, CURLOPT_SSLVERSION,
826 sslversions[i].ssl_version);
827 break;
828 }
829 }
830 if (i == ARRAY_SIZE(sslversions))
831 warning("unsupported ssl version %s: using default",
832 ssl_version);
833 }
834
835 if (getenv("GIT_SSL_CIPHER_LIST"))
836 ssl_cipherlist = getenv("GIT_SSL_CIPHER_LIST");
837 if (ssl_cipherlist != NULL && *ssl_cipherlist)
838 curl_easy_setopt(result, CURLOPT_SSL_CIPHER_LIST,
839 ssl_cipherlist);
840
841 if (ssl_cert != NULL)
842 curl_easy_setopt(result, CURLOPT_SSLCERT, ssl_cert);
843 if (has_cert_password())
844 curl_easy_setopt(result, CURLOPT_KEYPASSWD, cert_auth.password);
845 if (ssl_key != NULL)
846 curl_easy_setopt(result, CURLOPT_SSLKEY, ssl_key);
847 if (ssl_capath != NULL)
848 curl_easy_setopt(result, CURLOPT_CAPATH, ssl_capath);
849 #ifdef GIT_CURL_HAVE_CURLOPT_PINNEDPUBLICKEY
850 if (ssl_pinnedkey != NULL)
851 curl_easy_setopt(result, CURLOPT_PINNEDPUBLICKEY, ssl_pinnedkey);
852 #endif
853 if (http_ssl_backend && !strcmp("schannel", http_ssl_backend) &&
854 !http_schannel_use_ssl_cainfo) {
855 curl_easy_setopt(result, CURLOPT_CAINFO, NULL);
856 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
857 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, NULL);
858 #endif
859 } else if (ssl_cainfo != NULL || http_proxy_ssl_ca_info != NULL) {
860 if (ssl_cainfo != NULL)
861 curl_easy_setopt(result, CURLOPT_CAINFO, ssl_cainfo);
862 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_CAINFO
863 if (http_proxy_ssl_ca_info != NULL)
864 curl_easy_setopt(result, CURLOPT_PROXY_CAINFO, http_proxy_ssl_ca_info);
865 #endif
866 }
867
868 if (curl_low_speed_limit > 0 && curl_low_speed_time > 0) {
869 curl_easy_setopt(result, CURLOPT_LOW_SPEED_LIMIT,
870 curl_low_speed_limit);
871 curl_easy_setopt(result, CURLOPT_LOW_SPEED_TIME,
872 curl_low_speed_time);
873 }
874
875 curl_easy_setopt(result, CURLOPT_MAXREDIRS, 20);
876 curl_easy_setopt(result, CURLOPT_POSTREDIR, CURL_REDIR_POST_ALL);
877 curl_easy_setopt(result, CURLOPT_REDIR_PROTOCOLS,
878 get_curl_allowed_protocols(0));
879 curl_easy_setopt(result, CURLOPT_PROTOCOLS,
880 get_curl_allowed_protocols(-1));
881 if (getenv("GIT_CURL_VERBOSE"))
882 http_trace_curl_no_data();
883 setup_curl_trace(result);
884 if (getenv("GIT_TRACE_CURL_NO_DATA"))
885 trace_curl_data = 0;
886 if (!git_env_bool("GIT_TRACE_REDACT", 1))
887 trace_curl_redact = 0;
888
889 curl_easy_setopt(result, CURLOPT_USERAGENT,
890 user_agent ? user_agent : git_user_agent());
891
892 if (curl_ftp_no_epsv)
893 curl_easy_setopt(result, CURLOPT_FTP_USE_EPSV, 0);
894
895 if (curl_ssl_try)
896 curl_easy_setopt(result, CURLOPT_USE_SSL, CURLUSESSL_TRY);
897
898 /*
899 * CURL also examines these variables as a fallback; but we need to query
900 * them here in order to decide whether to prompt for missing password (cf.
901 * init_curl_proxy_auth()).
902 *
903 * Unlike many other common environment variables, these are historically
904 * lowercase only. It appears that CURL did not know this and implemented
905 * only uppercase variants, which was later corrected to take both - with
906 * the exception of http_proxy, which is lowercase only also in CURL. As
907 * the lowercase versions are the historical quasi-standard, they take
908 * precedence here, as in CURL.
909 */
910 if (!curl_http_proxy) {
911 if (http_auth.protocol && !strcmp(http_auth.protocol, "https")) {
912 var_override(&curl_http_proxy, getenv("HTTPS_PROXY"));
913 var_override(&curl_http_proxy, getenv("https_proxy"));
914 } else {
915 var_override(&curl_http_proxy, getenv("http_proxy"));
916 }
917 if (!curl_http_proxy) {
918 var_override(&curl_http_proxy, getenv("ALL_PROXY"));
919 var_override(&curl_http_proxy, getenv("all_proxy"));
920 }
921 }
922
923 if (curl_http_proxy && curl_http_proxy[0] == '\0') {
924 /*
925 * Handle case with the empty http.proxy value here to keep
926 * common code clean.
927 * NB: empty option disables proxying at all.
928 */
929 curl_easy_setopt(result, CURLOPT_PROXY, "");
930 } else if (curl_http_proxy) {
931 if (starts_with(curl_http_proxy, "socks5h"))
932 curl_easy_setopt(result,
933 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5_HOSTNAME);
934 else if (starts_with(curl_http_proxy, "socks5"))
935 curl_easy_setopt(result,
936 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS5);
937 else if (starts_with(curl_http_proxy, "socks4a"))
938 curl_easy_setopt(result,
939 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4A);
940 else if (starts_with(curl_http_proxy, "socks"))
941 curl_easy_setopt(result,
942 CURLOPT_PROXYTYPE, CURLPROXY_SOCKS4);
943 #ifdef GIT_CURL_HAVE_CURLOPT_PROXY_KEYPASSWD
944 else if (starts_with(curl_http_proxy, "https")) {
945 curl_easy_setopt(result, CURLOPT_PROXYTYPE, CURLPROXY_HTTPS);
946
947 if (http_proxy_ssl_cert)
948 curl_easy_setopt(result, CURLOPT_PROXY_SSLCERT, http_proxy_ssl_cert);
949
950 if (http_proxy_ssl_key)
951 curl_easy_setopt(result, CURLOPT_PROXY_SSLKEY, http_proxy_ssl_key);
952
953 if (has_proxy_cert_password())
954 curl_easy_setopt(result, CURLOPT_PROXY_KEYPASSWD, proxy_cert_auth.password);
955 }
956 #endif
957 if (strstr(curl_http_proxy, "://"))
958 credential_from_url(&proxy_auth, curl_http_proxy);
959 else {
960 struct strbuf url = STRBUF_INIT;
961 strbuf_addf(&url, "http://%s", curl_http_proxy);
962 credential_from_url(&proxy_auth, url.buf);
963 strbuf_release(&url);
964 }
965
966 if (!proxy_auth.host)
967 die("Invalid proxy URL '%s'", curl_http_proxy);
968
969 curl_easy_setopt(result, CURLOPT_PROXY, proxy_auth.host);
970 var_override(&curl_no_proxy, getenv("NO_PROXY"));
971 var_override(&curl_no_proxy, getenv("no_proxy"));
972 curl_easy_setopt(result, CURLOPT_NOPROXY, curl_no_proxy);
973 }
974 init_curl_proxy_auth(result);
975
976 set_curl_keepalive(result);
977
978 return result;
979 }
980
set_from_env(const char ** var,const char * envname)981 static void set_from_env(const char **var, const char *envname)
982 {
983 const char *val = getenv(envname);
984 if (val)
985 *var = val;
986 }
987
http_init(struct remote * remote,const char * url,int proactive_auth)988 void http_init(struct remote *remote, const char *url, int proactive_auth)
989 {
990 char *low_speed_limit;
991 char *low_speed_time;
992 char *normalized_url;
993 struct urlmatch_config config = URLMATCH_CONFIG_INIT;
994
995 config.section = "http";
996 config.key = NULL;
997 config.collect_fn = http_options;
998 config.cascade_fn = git_default_config;
999 config.cb = NULL;
1000
1001 http_is_verbose = 0;
1002 normalized_url = url_normalize(url, &config.url);
1003
1004 git_config(urlmatch_config_entry, &config);
1005 free(normalized_url);
1006 string_list_clear(&config.vars, 1);
1007
1008 #ifdef GIT_CURL_HAVE_CURLSSLSET_NO_BACKENDS
1009 if (http_ssl_backend) {
1010 const curl_ssl_backend **backends;
1011 struct strbuf buf = STRBUF_INIT;
1012 int i;
1013
1014 switch (curl_global_sslset(-1, http_ssl_backend, &backends)) {
1015 case CURLSSLSET_UNKNOWN_BACKEND:
1016 strbuf_addf(&buf, _("Unsupported SSL backend '%s'. "
1017 "Supported SSL backends:"),
1018 http_ssl_backend);
1019 for (i = 0; backends[i]; i++)
1020 strbuf_addf(&buf, "\n\t%s", backends[i]->name);
1021 die("%s", buf.buf);
1022 case CURLSSLSET_NO_BACKENDS:
1023 die(_("Could not set SSL backend to '%s': "
1024 "cURL was built without SSL backends"),
1025 http_ssl_backend);
1026 case CURLSSLSET_TOO_LATE:
1027 die(_("Could not set SSL backend to '%s': already set"),
1028 http_ssl_backend);
1029 case CURLSSLSET_OK:
1030 break; /* Okay! */
1031 }
1032 }
1033 #endif
1034
1035 if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1036 die("curl_global_init failed");
1037
1038 http_proactive_auth = proactive_auth;
1039
1040 if (remote && remote->http_proxy)
1041 curl_http_proxy = xstrdup(remote->http_proxy);
1042
1043 if (remote)
1044 var_override(&http_proxy_authmethod, remote->http_proxy_authmethod);
1045
1046 pragma_header = curl_slist_append(http_copy_default_headers(),
1047 "Pragma: no-cache");
1048 no_pragma_header = curl_slist_append(http_copy_default_headers(),
1049 "Pragma:");
1050
1051 {
1052 char *http_max_requests = getenv("GIT_HTTP_MAX_REQUESTS");
1053 if (http_max_requests != NULL)
1054 max_requests = atoi(http_max_requests);
1055 }
1056
1057 curlm = curl_multi_init();
1058 if (!curlm)
1059 die("curl_multi_init failed");
1060
1061 if (getenv("GIT_SSL_NO_VERIFY"))
1062 curl_ssl_verify = 0;
1063
1064 set_from_env(&ssl_cert, "GIT_SSL_CERT");
1065 set_from_env(&ssl_key, "GIT_SSL_KEY");
1066 set_from_env(&ssl_capath, "GIT_SSL_CAPATH");
1067 set_from_env(&ssl_cainfo, "GIT_SSL_CAINFO");
1068
1069 set_from_env(&user_agent, "GIT_HTTP_USER_AGENT");
1070
1071 low_speed_limit = getenv("GIT_HTTP_LOW_SPEED_LIMIT");
1072 if (low_speed_limit != NULL)
1073 curl_low_speed_limit = strtol(low_speed_limit, NULL, 10);
1074 low_speed_time = getenv("GIT_HTTP_LOW_SPEED_TIME");
1075 if (low_speed_time != NULL)
1076 curl_low_speed_time = strtol(low_speed_time, NULL, 10);
1077
1078 if (curl_ssl_verify == -1)
1079 curl_ssl_verify = 1;
1080
1081 curl_session_count = 0;
1082 if (max_requests < 1)
1083 max_requests = DEFAULT_MAX_REQUESTS;
1084
1085 set_from_env(&http_proxy_ssl_cert, "GIT_PROXY_SSL_CERT");
1086 set_from_env(&http_proxy_ssl_key, "GIT_PROXY_SSL_KEY");
1087 set_from_env(&http_proxy_ssl_ca_info, "GIT_PROXY_SSL_CAINFO");
1088
1089 if (getenv("GIT_PROXY_SSL_CERT_PASSWORD_PROTECTED"))
1090 proxy_ssl_cert_password_required = 1;
1091
1092 if (getenv("GIT_CURL_FTP_NO_EPSV"))
1093 curl_ftp_no_epsv = 1;
1094
1095 if (url) {
1096 credential_from_url(&http_auth, url);
1097 if (!ssl_cert_password_required &&
1098 getenv("GIT_SSL_CERT_PASSWORD_PROTECTED") &&
1099 starts_with(url, "https://"))
1100 ssl_cert_password_required = 1;
1101 }
1102
1103 curl_default = get_curl_handle();
1104 }
1105
http_cleanup(void)1106 void http_cleanup(void)
1107 {
1108 struct active_request_slot *slot = active_queue_head;
1109
1110 while (slot != NULL) {
1111 struct active_request_slot *next = slot->next;
1112 if (slot->curl != NULL) {
1113 xmulti_remove_handle(slot);
1114 curl_easy_cleanup(slot->curl);
1115 }
1116 free(slot);
1117 slot = next;
1118 }
1119 active_queue_head = NULL;
1120
1121 curl_easy_cleanup(curl_default);
1122
1123 curl_multi_cleanup(curlm);
1124 curl_global_cleanup();
1125
1126 string_list_clear(&extra_http_headers, 0);
1127
1128 curl_slist_free_all(pragma_header);
1129 pragma_header = NULL;
1130
1131 curl_slist_free_all(no_pragma_header);
1132 no_pragma_header = NULL;
1133
1134 if (curl_http_proxy) {
1135 free((void *)curl_http_proxy);
1136 curl_http_proxy = NULL;
1137 }
1138
1139 if (proxy_auth.password) {
1140 memset(proxy_auth.password, 0, strlen(proxy_auth.password));
1141 FREE_AND_NULL(proxy_auth.password);
1142 }
1143
1144 free((void *)curl_proxyuserpwd);
1145 curl_proxyuserpwd = NULL;
1146
1147 free((void *)http_proxy_authmethod);
1148 http_proxy_authmethod = NULL;
1149
1150 if (cert_auth.password != NULL) {
1151 memset(cert_auth.password, 0, strlen(cert_auth.password));
1152 FREE_AND_NULL(cert_auth.password);
1153 }
1154 ssl_cert_password_required = 0;
1155
1156 if (proxy_cert_auth.password != NULL) {
1157 memset(proxy_cert_auth.password, 0, strlen(proxy_cert_auth.password));
1158 FREE_AND_NULL(proxy_cert_auth.password);
1159 }
1160 proxy_ssl_cert_password_required = 0;
1161
1162 FREE_AND_NULL(cached_accept_language);
1163 }
1164
get_active_slot(void)1165 struct active_request_slot *get_active_slot(void)
1166 {
1167 struct active_request_slot *slot = active_queue_head;
1168 struct active_request_slot *newslot;
1169
1170 int num_transfers;
1171
1172 /* Wait for a slot to open up if the queue is full */
1173 while (active_requests >= max_requests) {
1174 curl_multi_perform(curlm, &num_transfers);
1175 if (num_transfers < active_requests)
1176 process_curl_messages();
1177 }
1178
1179 while (slot != NULL && slot->in_use)
1180 slot = slot->next;
1181
1182 if (slot == NULL) {
1183 newslot = xmalloc(sizeof(*newslot));
1184 newslot->curl = NULL;
1185 newslot->in_use = 0;
1186 newslot->next = NULL;
1187
1188 slot = active_queue_head;
1189 if (slot == NULL) {
1190 active_queue_head = newslot;
1191 } else {
1192 while (slot->next != NULL)
1193 slot = slot->next;
1194 slot->next = newslot;
1195 }
1196 slot = newslot;
1197 }
1198
1199 if (slot->curl == NULL) {
1200 slot->curl = curl_easy_duphandle(curl_default);
1201 curl_session_count++;
1202 }
1203
1204 active_requests++;
1205 slot->in_use = 1;
1206 slot->results = NULL;
1207 slot->finished = NULL;
1208 slot->callback_data = NULL;
1209 slot->callback_func = NULL;
1210 curl_easy_setopt(slot->curl, CURLOPT_COOKIEFILE, curl_cookie_file);
1211 if (curl_save_cookies)
1212 curl_easy_setopt(slot->curl, CURLOPT_COOKIEJAR, curl_cookie_file);
1213 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, pragma_header);
1214 curl_easy_setopt(slot->curl, CURLOPT_ERRORBUFFER, curl_errorstr);
1215 curl_easy_setopt(slot->curl, CURLOPT_CUSTOMREQUEST, NULL);
1216 curl_easy_setopt(slot->curl, CURLOPT_READFUNCTION, NULL);
1217 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION, NULL);
1218 curl_easy_setopt(slot->curl, CURLOPT_POSTFIELDS, NULL);
1219 curl_easy_setopt(slot->curl, CURLOPT_UPLOAD, 0);
1220 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1221 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 1);
1222 curl_easy_setopt(slot->curl, CURLOPT_RANGE, NULL);
1223
1224 /*
1225 * Default following to off unless "ALWAYS" is configured; this gives
1226 * callers a sane starting point, and they can tweak for individual
1227 * HTTP_FOLLOW_* cases themselves.
1228 */
1229 if (http_follow_config == HTTP_FOLLOW_ALWAYS)
1230 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1231 else
1232 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 0);
1233
1234 curl_easy_setopt(slot->curl, CURLOPT_IPRESOLVE, git_curl_ipresolve);
1235 curl_easy_setopt(slot->curl, CURLOPT_HTTPAUTH, http_auth_methods);
1236 if (http_auth.password || curl_empty_auth_enabled())
1237 init_curl_http_auth(slot->curl);
1238
1239 return slot;
1240 }
1241
start_active_slot(struct active_request_slot * slot)1242 int start_active_slot(struct active_request_slot *slot)
1243 {
1244 CURLMcode curlm_result = curl_multi_add_handle(curlm, slot->curl);
1245 int num_transfers;
1246
1247 if (curlm_result != CURLM_OK &&
1248 curlm_result != CURLM_CALL_MULTI_PERFORM) {
1249 warning("curl_multi_add_handle failed: %s",
1250 curl_multi_strerror(curlm_result));
1251 active_requests--;
1252 slot->in_use = 0;
1253 return 0;
1254 }
1255
1256 /*
1257 * We know there must be something to do, since we just added
1258 * something.
1259 */
1260 curl_multi_perform(curlm, &num_transfers);
1261 return 1;
1262 }
1263
1264 struct fill_chain {
1265 void *data;
1266 int (*fill)(void *);
1267 struct fill_chain *next;
1268 };
1269
1270 static struct fill_chain *fill_cfg;
1271
add_fill_function(void * data,int (* fill)(void *))1272 void add_fill_function(void *data, int (*fill)(void *))
1273 {
1274 struct fill_chain *new_fill = xmalloc(sizeof(*new_fill));
1275 struct fill_chain **linkp = &fill_cfg;
1276 new_fill->data = data;
1277 new_fill->fill = fill;
1278 new_fill->next = NULL;
1279 while (*linkp)
1280 linkp = &(*linkp)->next;
1281 *linkp = new_fill;
1282 }
1283
fill_active_slots(void)1284 void fill_active_slots(void)
1285 {
1286 struct active_request_slot *slot = active_queue_head;
1287
1288 while (active_requests < max_requests) {
1289 struct fill_chain *fill;
1290 for (fill = fill_cfg; fill; fill = fill->next)
1291 if (fill->fill(fill->data))
1292 break;
1293
1294 if (!fill)
1295 break;
1296 }
1297
1298 while (slot != NULL) {
1299 if (!slot->in_use && slot->curl != NULL
1300 && curl_session_count > min_curl_sessions) {
1301 curl_easy_cleanup(slot->curl);
1302 slot->curl = NULL;
1303 curl_session_count--;
1304 }
1305 slot = slot->next;
1306 }
1307 }
1308
step_active_slots(void)1309 void step_active_slots(void)
1310 {
1311 int num_transfers;
1312 CURLMcode curlm_result;
1313
1314 do {
1315 curlm_result = curl_multi_perform(curlm, &num_transfers);
1316 } while (curlm_result == CURLM_CALL_MULTI_PERFORM);
1317 if (num_transfers < active_requests) {
1318 process_curl_messages();
1319 fill_active_slots();
1320 }
1321 }
1322
run_active_slot(struct active_request_slot * slot)1323 void run_active_slot(struct active_request_slot *slot)
1324 {
1325 fd_set readfds;
1326 fd_set writefds;
1327 fd_set excfds;
1328 int max_fd;
1329 struct timeval select_timeout;
1330 int finished = 0;
1331
1332 slot->finished = &finished;
1333 while (!finished) {
1334 step_active_slots();
1335
1336 if (slot->in_use) {
1337 long curl_timeout;
1338 curl_multi_timeout(curlm, &curl_timeout);
1339 if (curl_timeout == 0) {
1340 continue;
1341 } else if (curl_timeout == -1) {
1342 select_timeout.tv_sec = 0;
1343 select_timeout.tv_usec = 50000;
1344 } else {
1345 select_timeout.tv_sec = curl_timeout / 1000;
1346 select_timeout.tv_usec = (curl_timeout % 1000) * 1000;
1347 }
1348
1349 max_fd = -1;
1350 FD_ZERO(&readfds);
1351 FD_ZERO(&writefds);
1352 FD_ZERO(&excfds);
1353 curl_multi_fdset(curlm, &readfds, &writefds, &excfds, &max_fd);
1354
1355 /*
1356 * It can happen that curl_multi_timeout returns a pathologically
1357 * long timeout when curl_multi_fdset returns no file descriptors
1358 * to read. See commit message for more details.
1359 */
1360 if (max_fd < 0 &&
1361 (select_timeout.tv_sec > 0 ||
1362 select_timeout.tv_usec > 50000)) {
1363 select_timeout.tv_sec = 0;
1364 select_timeout.tv_usec = 50000;
1365 }
1366
1367 select(max_fd+1, &readfds, &writefds, &excfds, &select_timeout);
1368 }
1369 }
1370 }
1371
release_active_slot(struct active_request_slot * slot)1372 static void release_active_slot(struct active_request_slot *slot)
1373 {
1374 closedown_active_slot(slot);
1375 if (slot->curl) {
1376 xmulti_remove_handle(slot);
1377 if (curl_session_count > min_curl_sessions) {
1378 curl_easy_cleanup(slot->curl);
1379 slot->curl = NULL;
1380 curl_session_count--;
1381 }
1382 }
1383 fill_active_slots();
1384 }
1385
finish_all_active_slots(void)1386 void finish_all_active_slots(void)
1387 {
1388 struct active_request_slot *slot = active_queue_head;
1389
1390 while (slot != NULL)
1391 if (slot->in_use) {
1392 run_active_slot(slot);
1393 slot = active_queue_head;
1394 } else {
1395 slot = slot->next;
1396 }
1397 }
1398
1399 /* Helpers for modifying and creating URLs */
needs_quote(int ch)1400 static inline int needs_quote(int ch)
1401 {
1402 if (((ch >= 'A') && (ch <= 'Z'))
1403 || ((ch >= 'a') && (ch <= 'z'))
1404 || ((ch >= '0') && (ch <= '9'))
1405 || (ch == '/')
1406 || (ch == '-')
1407 || (ch == '.'))
1408 return 0;
1409 return 1;
1410 }
1411
quote_ref_url(const char * base,const char * ref)1412 static char *quote_ref_url(const char *base, const char *ref)
1413 {
1414 struct strbuf buf = STRBUF_INIT;
1415 const char *cp;
1416 int ch;
1417
1418 end_url_with_slash(&buf, base);
1419
1420 for (cp = ref; (ch = *cp) != 0; cp++)
1421 if (needs_quote(ch))
1422 strbuf_addf(&buf, "%%%02x", ch);
1423 else
1424 strbuf_addch(&buf, *cp);
1425
1426 return strbuf_detach(&buf, NULL);
1427 }
1428
append_remote_object_url(struct strbuf * buf,const char * url,const char * hex,int only_two_digit_prefix)1429 void append_remote_object_url(struct strbuf *buf, const char *url,
1430 const char *hex,
1431 int only_two_digit_prefix)
1432 {
1433 end_url_with_slash(buf, url);
1434
1435 strbuf_addf(buf, "objects/%.*s/", 2, hex);
1436 if (!only_two_digit_prefix)
1437 strbuf_addstr(buf, hex + 2);
1438 }
1439
get_remote_object_url(const char * url,const char * hex,int only_two_digit_prefix)1440 char *get_remote_object_url(const char *url, const char *hex,
1441 int only_two_digit_prefix)
1442 {
1443 struct strbuf buf = STRBUF_INIT;
1444 append_remote_object_url(&buf, url, hex, only_two_digit_prefix);
1445 return strbuf_detach(&buf, NULL);
1446 }
1447
normalize_curl_result(CURLcode * result,long http_code,char * errorstr,size_t errorlen)1448 void normalize_curl_result(CURLcode *result, long http_code,
1449 char *errorstr, size_t errorlen)
1450 {
1451 /*
1452 * If we see a failing http code with CURLE_OK, we have turned off
1453 * FAILONERROR (to keep the server's custom error response), and should
1454 * translate the code into failure here.
1455 *
1456 * Likewise, if we see a redirect (30x code), that means we turned off
1457 * redirect-following, and we should treat the result as an error.
1458 */
1459 if (*result == CURLE_OK && http_code >= 300) {
1460 *result = CURLE_HTTP_RETURNED_ERROR;
1461 /*
1462 * Normally curl will already have put the "reason phrase"
1463 * from the server into curl_errorstr; unfortunately without
1464 * FAILONERROR it is lost, so we can give only the numeric
1465 * status code.
1466 */
1467 xsnprintf(errorstr, errorlen,
1468 "The requested URL returned error: %ld",
1469 http_code);
1470 }
1471 }
1472
handle_curl_result(struct slot_results * results)1473 static int handle_curl_result(struct slot_results *results)
1474 {
1475 normalize_curl_result(&results->curl_result, results->http_code,
1476 curl_errorstr, sizeof(curl_errorstr));
1477
1478 if (results->curl_result == CURLE_OK) {
1479 credential_approve(&http_auth);
1480 credential_approve(&proxy_auth);
1481 credential_approve(&cert_auth);
1482 return HTTP_OK;
1483 } else if (results->curl_result == CURLE_SSL_CERTPROBLEM) {
1484 /*
1485 * We can't tell from here whether it's a bad path, bad
1486 * certificate, bad password, or something else wrong
1487 * with the certificate. So we reject the credential to
1488 * avoid caching or saving a bad password.
1489 */
1490 credential_reject(&cert_auth);
1491 return HTTP_NOAUTH;
1492 #ifdef GIT_CURL_HAVE_CURLE_SSL_PINNEDPUBKEYNOTMATCH
1493 } else if (results->curl_result == CURLE_SSL_PINNEDPUBKEYNOTMATCH) {
1494 return HTTP_NOMATCHPUBLICKEY;
1495 #endif
1496 } else if (missing_target(results))
1497 return HTTP_MISSING_TARGET;
1498 else if (results->http_code == 401) {
1499 if (http_auth.username && http_auth.password) {
1500 credential_reject(&http_auth);
1501 return HTTP_NOAUTH;
1502 } else {
1503 http_auth_methods &= ~CURLAUTH_GSSNEGOTIATE;
1504 if (results->auth_avail) {
1505 http_auth_methods &= results->auth_avail;
1506 http_auth_methods_restricted = 1;
1507 }
1508 return HTTP_REAUTH;
1509 }
1510 } else {
1511 if (results->http_connectcode == 407)
1512 credential_reject(&proxy_auth);
1513 if (!curl_errorstr[0])
1514 strlcpy(curl_errorstr,
1515 curl_easy_strerror(results->curl_result),
1516 sizeof(curl_errorstr));
1517 return HTTP_ERROR;
1518 }
1519 }
1520
run_one_slot(struct active_request_slot * slot,struct slot_results * results)1521 int run_one_slot(struct active_request_slot *slot,
1522 struct slot_results *results)
1523 {
1524 slot->results = results;
1525 if (!start_active_slot(slot)) {
1526 xsnprintf(curl_errorstr, sizeof(curl_errorstr),
1527 "failed to start HTTP request");
1528 return HTTP_START_FAILED;
1529 }
1530
1531 run_active_slot(slot);
1532 return handle_curl_result(results);
1533 }
1534
http_copy_default_headers(void)1535 struct curl_slist *http_copy_default_headers(void)
1536 {
1537 struct curl_slist *headers = NULL;
1538 const struct string_list_item *item;
1539
1540 for_each_string_list_item(item, &extra_http_headers)
1541 headers = curl_slist_append(headers, item->string);
1542
1543 return headers;
1544 }
1545
curlinfo_strbuf(CURL * curl,CURLINFO info,struct strbuf * buf)1546 static CURLcode curlinfo_strbuf(CURL *curl, CURLINFO info, struct strbuf *buf)
1547 {
1548 char *ptr;
1549 CURLcode ret;
1550
1551 strbuf_reset(buf);
1552 ret = curl_easy_getinfo(curl, info, &ptr);
1553 if (!ret && ptr)
1554 strbuf_addstr(buf, ptr);
1555 return ret;
1556 }
1557
1558 /*
1559 * Check for and extract a content-type parameter. "raw"
1560 * should be positioned at the start of the potential
1561 * parameter, with any whitespace already removed.
1562 *
1563 * "name" is the name of the parameter. The value is appended
1564 * to "out".
1565 */
extract_param(const char * raw,const char * name,struct strbuf * out)1566 static int extract_param(const char *raw, const char *name,
1567 struct strbuf *out)
1568 {
1569 size_t len = strlen(name);
1570
1571 if (strncasecmp(raw, name, len))
1572 return -1;
1573 raw += len;
1574
1575 if (*raw != '=')
1576 return -1;
1577 raw++;
1578
1579 while (*raw && !isspace(*raw) && *raw != ';')
1580 strbuf_addch(out, *raw++);
1581 return 0;
1582 }
1583
1584 /*
1585 * Extract a normalized version of the content type, with any
1586 * spaces suppressed, all letters lowercased, and no trailing ";"
1587 * or parameters.
1588 *
1589 * Note that we will silently remove even invalid whitespace. For
1590 * example, "text / plain" is specifically forbidden by RFC 2616,
1591 * but "text/plain" is the only reasonable output, and this keeps
1592 * our code simple.
1593 *
1594 * If the "charset" argument is not NULL, store the value of any
1595 * charset parameter there.
1596 *
1597 * Example:
1598 * "TEXT/PLAIN; charset=utf-8" -> "text/plain", "utf-8"
1599 * "text / plain" -> "text/plain"
1600 */
extract_content_type(struct strbuf * raw,struct strbuf * type,struct strbuf * charset)1601 static void extract_content_type(struct strbuf *raw, struct strbuf *type,
1602 struct strbuf *charset)
1603 {
1604 const char *p;
1605
1606 strbuf_reset(type);
1607 strbuf_grow(type, raw->len);
1608 for (p = raw->buf; *p; p++) {
1609 if (isspace(*p))
1610 continue;
1611 if (*p == ';') {
1612 p++;
1613 break;
1614 }
1615 strbuf_addch(type, tolower(*p));
1616 }
1617
1618 if (!charset)
1619 return;
1620
1621 strbuf_reset(charset);
1622 while (*p) {
1623 while (isspace(*p) || *p == ';')
1624 p++;
1625 if (!extract_param(p, "charset", charset))
1626 return;
1627 while (*p && !isspace(*p))
1628 p++;
1629 }
1630
1631 if (!charset->len && starts_with(type->buf, "text/"))
1632 strbuf_addstr(charset, "ISO-8859-1");
1633 }
1634
write_accept_language(struct strbuf * buf)1635 static void write_accept_language(struct strbuf *buf)
1636 {
1637 /*
1638 * MAX_DECIMAL_PLACES must not be larger than 3. If it is larger than
1639 * that, q-value will be smaller than 0.001, the minimum q-value the
1640 * HTTP specification allows. See
1641 * http://tools.ietf.org/html/rfc7231#section-5.3.1 for q-value.
1642 */
1643 const int MAX_DECIMAL_PLACES = 3;
1644 const int MAX_LANGUAGE_TAGS = 1000;
1645 const int MAX_ACCEPT_LANGUAGE_HEADER_SIZE = 4000;
1646 char **language_tags = NULL;
1647 int num_langs = 0;
1648 const char *s = get_preferred_languages();
1649 int i;
1650 struct strbuf tag = STRBUF_INIT;
1651
1652 /* Don't add Accept-Language header if no language is preferred. */
1653 if (!s)
1654 return;
1655
1656 /*
1657 * Split the colon-separated string of preferred languages into
1658 * language_tags array.
1659 */
1660 do {
1661 /* collect language tag */
1662 for (; *s && (isalnum(*s) || *s == '_'); s++)
1663 strbuf_addch(&tag, *s == '_' ? '-' : *s);
1664
1665 /* skip .codeset, @modifier and any other unnecessary parts */
1666 while (*s && *s != ':')
1667 s++;
1668
1669 if (tag.len) {
1670 num_langs++;
1671 REALLOC_ARRAY(language_tags, num_langs);
1672 language_tags[num_langs - 1] = strbuf_detach(&tag, NULL);
1673 if (num_langs >= MAX_LANGUAGE_TAGS - 1) /* -1 for '*' */
1674 break;
1675 }
1676 } while (*s++);
1677
1678 /* write Accept-Language header into buf */
1679 if (num_langs) {
1680 int last_buf_len = 0;
1681 int max_q;
1682 int decimal_places;
1683 char q_format[32];
1684
1685 /* add '*' */
1686 REALLOC_ARRAY(language_tags, num_langs + 1);
1687 language_tags[num_langs++] = "*"; /* it's OK; this won't be freed */
1688
1689 /* compute decimal_places */
1690 for (max_q = 1, decimal_places = 0;
1691 max_q < num_langs && decimal_places <= MAX_DECIMAL_PLACES;
1692 decimal_places++, max_q *= 10)
1693 ;
1694
1695 xsnprintf(q_format, sizeof(q_format), ";q=0.%%0%dd", decimal_places);
1696
1697 strbuf_addstr(buf, "Accept-Language: ");
1698
1699 for (i = 0; i < num_langs; i++) {
1700 if (i > 0)
1701 strbuf_addstr(buf, ", ");
1702
1703 strbuf_addstr(buf, language_tags[i]);
1704
1705 if (i > 0)
1706 strbuf_addf(buf, q_format, max_q - i);
1707
1708 if (buf->len > MAX_ACCEPT_LANGUAGE_HEADER_SIZE) {
1709 strbuf_remove(buf, last_buf_len, buf->len - last_buf_len);
1710 break;
1711 }
1712
1713 last_buf_len = buf->len;
1714 }
1715 }
1716
1717 /* free language tags -- last one is a static '*' */
1718 for (i = 0; i < num_langs - 1; i++)
1719 free(language_tags[i]);
1720 free(language_tags);
1721 }
1722
1723 /*
1724 * Get an Accept-Language header which indicates user's preferred languages.
1725 *
1726 * Examples:
1727 * LANGUAGE= -> ""
1728 * LANGUAGE=ko:en -> "Accept-Language: ko, en; q=0.9, *; q=0.1"
1729 * LANGUAGE=ko_KR.UTF-8:sr@latin -> "Accept-Language: ko-KR, sr; q=0.9, *; q=0.1"
1730 * LANGUAGE=ko LANG=en_US.UTF-8 -> "Accept-Language: ko, *; q=0.1"
1731 * LANGUAGE= LANG=en_US.UTF-8 -> "Accept-Language: en-US, *; q=0.1"
1732 * LANGUAGE= LANG=C -> ""
1733 */
get_accept_language(void)1734 static const char *get_accept_language(void)
1735 {
1736 if (!cached_accept_language) {
1737 struct strbuf buf = STRBUF_INIT;
1738 write_accept_language(&buf);
1739 if (buf.len > 0)
1740 cached_accept_language = strbuf_detach(&buf, NULL);
1741 }
1742
1743 return cached_accept_language;
1744 }
1745
http_opt_request_remainder(CURL * curl,off_t pos)1746 static void http_opt_request_remainder(CURL *curl, off_t pos)
1747 {
1748 char buf[128];
1749 xsnprintf(buf, sizeof(buf), "%"PRIuMAX"-", (uintmax_t)pos);
1750 curl_easy_setopt(curl, CURLOPT_RANGE, buf);
1751 }
1752
1753 /* http_request() targets */
1754 #define HTTP_REQUEST_STRBUF 0
1755 #define HTTP_REQUEST_FILE 1
1756
http_request(const char * url,void * result,int target,const struct http_get_options * options)1757 static int http_request(const char *url,
1758 void *result, int target,
1759 const struct http_get_options *options)
1760 {
1761 struct active_request_slot *slot;
1762 struct slot_results results;
1763 struct curl_slist *headers = http_copy_default_headers();
1764 struct strbuf buf = STRBUF_INIT;
1765 const char *accept_language;
1766 int ret;
1767
1768 slot = get_active_slot();
1769 curl_easy_setopt(slot->curl, CURLOPT_HTTPGET, 1);
1770
1771 if (result == NULL) {
1772 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 1);
1773 } else {
1774 curl_easy_setopt(slot->curl, CURLOPT_NOBODY, 0);
1775 curl_easy_setopt(slot->curl, CURLOPT_WRITEDATA, result);
1776
1777 if (target == HTTP_REQUEST_FILE) {
1778 off_t posn = ftello(result);
1779 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1780 fwrite);
1781 if (posn > 0)
1782 http_opt_request_remainder(slot->curl, posn);
1783 } else
1784 curl_easy_setopt(slot->curl, CURLOPT_WRITEFUNCTION,
1785 fwrite_buffer);
1786 }
1787
1788 accept_language = get_accept_language();
1789
1790 if (accept_language)
1791 headers = curl_slist_append(headers, accept_language);
1792
1793 strbuf_addstr(&buf, "Pragma:");
1794 if (options && options->no_cache)
1795 strbuf_addstr(&buf, " no-cache");
1796 if (options && options->initial_request &&
1797 http_follow_config == HTTP_FOLLOW_INITIAL)
1798 curl_easy_setopt(slot->curl, CURLOPT_FOLLOWLOCATION, 1);
1799
1800 headers = curl_slist_append(headers, buf.buf);
1801
1802 /* Add additional headers here */
1803 if (options && options->extra_headers) {
1804 const struct string_list_item *item;
1805 for_each_string_list_item(item, options->extra_headers) {
1806 headers = curl_slist_append(headers, item->string);
1807 }
1808 }
1809
1810 curl_easy_setopt(slot->curl, CURLOPT_URL, url);
1811 curl_easy_setopt(slot->curl, CURLOPT_HTTPHEADER, headers);
1812 curl_easy_setopt(slot->curl, CURLOPT_ENCODING, "");
1813 curl_easy_setopt(slot->curl, CURLOPT_FAILONERROR, 0);
1814
1815 ret = run_one_slot(slot, &results);
1816
1817 if (options && options->content_type) {
1818 struct strbuf raw = STRBUF_INIT;
1819 curlinfo_strbuf(slot->curl, CURLINFO_CONTENT_TYPE, &raw);
1820 extract_content_type(&raw, options->content_type,
1821 options->charset);
1822 strbuf_release(&raw);
1823 }
1824
1825 if (options && options->effective_url)
1826 curlinfo_strbuf(slot->curl, CURLINFO_EFFECTIVE_URL,
1827 options->effective_url);
1828
1829 curl_slist_free_all(headers);
1830 strbuf_release(&buf);
1831
1832 return ret;
1833 }
1834
1835 /*
1836 * Update the "base" url to a more appropriate value, as deduced by
1837 * redirects seen when requesting a URL starting with "url".
1838 *
1839 * The "asked" parameter is a URL that we asked curl to access, and must begin
1840 * with "base".
1841 *
1842 * The "got" parameter is the URL that curl reported to us as where we ended
1843 * up.
1844 *
1845 * Returns 1 if we updated the base url, 0 otherwise.
1846 *
1847 * Our basic strategy is to compare "base" and "asked" to find the bits
1848 * specific to our request. We then strip those bits off of "got" to yield the
1849 * new base. So for example, if our base is "http://example.com/foo.git",
1850 * and we ask for "http://example.com/foo.git/info/refs", we might end up
1851 * with "https://other.example.com/foo.git/info/refs". We would want the
1852 * new URL to become "https://other.example.com/foo.git".
1853 *
1854 * Note that this assumes a sane redirect scheme. It's entirely possible
1855 * in the example above to end up at a URL that does not even end in
1856 * "info/refs". In such a case we die. There's not much we can do, such a
1857 * scheme is unlikely to represent a real git repository, and failing to
1858 * rewrite the base opens options for malicious redirects to do funny things.
1859 */
update_url_from_redirect(struct strbuf * base,const char * asked,const struct strbuf * got)1860 static int update_url_from_redirect(struct strbuf *base,
1861 const char *asked,
1862 const struct strbuf *got)
1863 {
1864 const char *tail;
1865 size_t new_len;
1866
1867 if (!strcmp(asked, got->buf))
1868 return 0;
1869
1870 if (!skip_prefix(asked, base->buf, &tail))
1871 BUG("update_url_from_redirect: %s is not a superset of %s",
1872 asked, base->buf);
1873
1874 new_len = got->len;
1875 if (!strip_suffix_mem(got->buf, &new_len, tail))
1876 die(_("unable to update url base from redirection:\n"
1877 " asked for: %s\n"
1878 " redirect: %s"),
1879 asked, got->buf);
1880
1881 strbuf_reset(base);
1882 strbuf_add(base, got->buf, new_len);
1883
1884 return 1;
1885 }
1886
http_request_reauth(const char * url,void * result,int target,struct http_get_options * options)1887 static int http_request_reauth(const char *url,
1888 void *result, int target,
1889 struct http_get_options *options)
1890 {
1891 int ret = http_request(url, result, target, options);
1892
1893 if (ret != HTTP_OK && ret != HTTP_REAUTH)
1894 return ret;
1895
1896 if (options && options->effective_url && options->base_url) {
1897 if (update_url_from_redirect(options->base_url,
1898 url, options->effective_url)) {
1899 credential_from_url(&http_auth, options->base_url->buf);
1900 url = options->effective_url->buf;
1901 }
1902 }
1903
1904 if (ret != HTTP_REAUTH)
1905 return ret;
1906
1907 /*
1908 * The previous request may have put cruft into our output stream; we
1909 * should clear it out before making our next request.
1910 */
1911 switch (target) {
1912 case HTTP_REQUEST_STRBUF:
1913 strbuf_reset(result);
1914 break;
1915 case HTTP_REQUEST_FILE:
1916 if (fflush(result)) {
1917 error_errno("unable to flush a file");
1918 return HTTP_START_FAILED;
1919 }
1920 rewind(result);
1921 if (ftruncate(fileno(result), 0) < 0) {
1922 error_errno("unable to truncate a file");
1923 return HTTP_START_FAILED;
1924 }
1925 break;
1926 default:
1927 BUG("Unknown http_request target");
1928 }
1929
1930 credential_fill(&http_auth);
1931
1932 return http_request(url, result, target, options);
1933 }
1934
http_get_strbuf(const char * url,struct strbuf * result,struct http_get_options * options)1935 int http_get_strbuf(const char *url,
1936 struct strbuf *result,
1937 struct http_get_options *options)
1938 {
1939 return http_request_reauth(url, result, HTTP_REQUEST_STRBUF, options);
1940 }
1941
1942 /*
1943 * Downloads a URL and stores the result in the given file.
1944 *
1945 * If a previous interrupted download is detected (i.e. a previous temporary
1946 * file is still around) the download is resumed.
1947 */
http_get_file(const char * url,const char * filename,struct http_get_options * options)1948 static int http_get_file(const char *url, const char *filename,
1949 struct http_get_options *options)
1950 {
1951 int ret;
1952 struct strbuf tmpfile = STRBUF_INIT;
1953 FILE *result;
1954
1955 strbuf_addf(&tmpfile, "%s.temp", filename);
1956 result = fopen(tmpfile.buf, "a");
1957 if (!result) {
1958 error("Unable to open local file %s", tmpfile.buf);
1959 ret = HTTP_ERROR;
1960 goto cleanup;
1961 }
1962
1963 ret = http_request_reauth(url, result, HTTP_REQUEST_FILE, options);
1964 fclose(result);
1965
1966 if (ret == HTTP_OK && finalize_object_file(tmpfile.buf, filename))
1967 ret = HTTP_ERROR;
1968 cleanup:
1969 strbuf_release(&tmpfile);
1970 return ret;
1971 }
1972
http_fetch_ref(const char * base,struct ref * ref)1973 int http_fetch_ref(const char *base, struct ref *ref)
1974 {
1975 struct http_get_options options = {0};
1976 char *url;
1977 struct strbuf buffer = STRBUF_INIT;
1978 int ret = -1;
1979
1980 options.no_cache = 1;
1981
1982 url = quote_ref_url(base, ref->name);
1983 if (http_get_strbuf(url, &buffer, &options) == HTTP_OK) {
1984 strbuf_rtrim(&buffer);
1985 if (buffer.len == the_hash_algo->hexsz)
1986 ret = get_oid_hex(buffer.buf, &ref->old_oid);
1987 else if (starts_with(buffer.buf, "ref: ")) {
1988 ref->symref = xstrdup(buffer.buf + 5);
1989 ret = 0;
1990 }
1991 }
1992
1993 strbuf_release(&buffer);
1994 free(url);
1995 return ret;
1996 }
1997
1998 /* Helpers for fetching packs */
fetch_pack_index(unsigned char * hash,const char * base_url)1999 static char *fetch_pack_index(unsigned char *hash, const char *base_url)
2000 {
2001 char *url, *tmp;
2002 struct strbuf buf = STRBUF_INIT;
2003
2004 if (http_is_verbose)
2005 fprintf(stderr, "Getting index for pack %s\n", hash_to_hex(hash));
2006
2007 end_url_with_slash(&buf, base_url);
2008 strbuf_addf(&buf, "objects/pack/pack-%s.idx", hash_to_hex(hash));
2009 url = strbuf_detach(&buf, NULL);
2010
2011 strbuf_addf(&buf, "%s.temp", sha1_pack_index_name(hash));
2012 tmp = strbuf_detach(&buf, NULL);
2013
2014 if (http_get_file(url, tmp, NULL) != HTTP_OK) {
2015 error("Unable to get pack index %s", url);
2016 FREE_AND_NULL(tmp);
2017 }
2018
2019 free(url);
2020 return tmp;
2021 }
2022
fetch_and_setup_pack_index(struct packed_git ** packs_head,unsigned char * sha1,const char * base_url)2023 static int fetch_and_setup_pack_index(struct packed_git **packs_head,
2024 unsigned char *sha1, const char *base_url)
2025 {
2026 struct packed_git *new_pack;
2027 char *tmp_idx = NULL;
2028 int ret;
2029
2030 if (has_pack_index(sha1)) {
2031 new_pack = parse_pack_index(sha1, sha1_pack_index_name(sha1));
2032 if (!new_pack)
2033 return -1; /* parse_pack_index() already issued error message */
2034 goto add_pack;
2035 }
2036
2037 tmp_idx = fetch_pack_index(sha1, base_url);
2038 if (!tmp_idx)
2039 return -1;
2040
2041 new_pack = parse_pack_index(sha1, tmp_idx);
2042 if (!new_pack) {
2043 unlink(tmp_idx);
2044 free(tmp_idx);
2045
2046 return -1; /* parse_pack_index() already issued error message */
2047 }
2048
2049 ret = verify_pack_index(new_pack);
2050 if (!ret) {
2051 close_pack_index(new_pack);
2052 ret = finalize_object_file(tmp_idx, sha1_pack_index_name(sha1));
2053 }
2054 free(tmp_idx);
2055 if (ret)
2056 return -1;
2057
2058 add_pack:
2059 new_pack->next = *packs_head;
2060 *packs_head = new_pack;
2061 return 0;
2062 }
2063
http_get_info_packs(const char * base_url,struct packed_git ** packs_head)2064 int http_get_info_packs(const char *base_url, struct packed_git **packs_head)
2065 {
2066 struct http_get_options options = {0};
2067 int ret = 0;
2068 char *url;
2069 const char *data;
2070 struct strbuf buf = STRBUF_INIT;
2071 struct object_id oid;
2072
2073 end_url_with_slash(&buf, base_url);
2074 strbuf_addstr(&buf, "objects/info/packs");
2075 url = strbuf_detach(&buf, NULL);
2076
2077 options.no_cache = 1;
2078 ret = http_get_strbuf(url, &buf, &options);
2079 if (ret != HTTP_OK)
2080 goto cleanup;
2081
2082 data = buf.buf;
2083 while (*data) {
2084 if (skip_prefix(data, "P pack-", &data) &&
2085 !parse_oid_hex(data, &oid, &data) &&
2086 skip_prefix(data, ".pack", &data) &&
2087 (*data == '\n' || *data == '\0')) {
2088 fetch_and_setup_pack_index(packs_head, oid.hash, base_url);
2089 } else {
2090 data = strchrnul(data, '\n');
2091 }
2092 if (*data)
2093 data++; /* skip past newline */
2094 }
2095
2096 cleanup:
2097 free(url);
2098 return ret;
2099 }
2100
release_http_pack_request(struct http_pack_request * preq)2101 void release_http_pack_request(struct http_pack_request *preq)
2102 {
2103 if (preq->packfile != NULL) {
2104 fclose(preq->packfile);
2105 preq->packfile = NULL;
2106 }
2107 preq->slot = NULL;
2108 strbuf_release(&preq->tmpfile);
2109 free(preq->url);
2110 free(preq);
2111 }
2112
2113 static const char *default_index_pack_args[] =
2114 {"index-pack", "--stdin", NULL};
2115
finish_http_pack_request(struct http_pack_request * preq)2116 int finish_http_pack_request(struct http_pack_request *preq)
2117 {
2118 struct child_process ip = CHILD_PROCESS_INIT;
2119 int tmpfile_fd;
2120 int ret = 0;
2121
2122 fclose(preq->packfile);
2123 preq->packfile = NULL;
2124
2125 tmpfile_fd = xopen(preq->tmpfile.buf, O_RDONLY);
2126
2127 ip.git_cmd = 1;
2128 ip.in = tmpfile_fd;
2129 ip.argv = preq->index_pack_args ? preq->index_pack_args
2130 : default_index_pack_args;
2131
2132 if (preq->preserve_index_pack_stdout)
2133 ip.out = 0;
2134 else
2135 ip.no_stdout = 1;
2136
2137 if (run_command(&ip)) {
2138 ret = -1;
2139 goto cleanup;
2140 }
2141
2142 cleanup:
2143 close(tmpfile_fd);
2144 unlink(preq->tmpfile.buf);
2145 return ret;
2146 }
2147
http_install_packfile(struct packed_git * p,struct packed_git ** list_to_remove_from)2148 void http_install_packfile(struct packed_git *p,
2149 struct packed_git **list_to_remove_from)
2150 {
2151 struct packed_git **lst = list_to_remove_from;
2152
2153 while (*lst != p)
2154 lst = &((*lst)->next);
2155 *lst = (*lst)->next;
2156
2157 install_packed_git(the_repository, p);
2158 }
2159
new_http_pack_request(const unsigned char * packed_git_hash,const char * base_url)2160 struct http_pack_request *new_http_pack_request(
2161 const unsigned char *packed_git_hash, const char *base_url) {
2162
2163 struct strbuf buf = STRBUF_INIT;
2164
2165 end_url_with_slash(&buf, base_url);
2166 strbuf_addf(&buf, "objects/pack/pack-%s.pack",
2167 hash_to_hex(packed_git_hash));
2168 return new_direct_http_pack_request(packed_git_hash,
2169 strbuf_detach(&buf, NULL));
2170 }
2171
new_direct_http_pack_request(const unsigned char * packed_git_hash,char * url)2172 struct http_pack_request *new_direct_http_pack_request(
2173 const unsigned char *packed_git_hash, char *url)
2174 {
2175 off_t prev_posn = 0;
2176 struct http_pack_request *preq;
2177
2178 CALLOC_ARRAY(preq, 1);
2179 strbuf_init(&preq->tmpfile, 0);
2180
2181 preq->url = url;
2182
2183 strbuf_addf(&preq->tmpfile, "%s.temp", sha1_pack_name(packed_git_hash));
2184 preq->packfile = fopen(preq->tmpfile.buf, "a");
2185 if (!preq->packfile) {
2186 error("Unable to open local file %s for pack",
2187 preq->tmpfile.buf);
2188 goto abort;
2189 }
2190
2191 preq->slot = get_active_slot();
2192 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEDATA, preq->packfile);
2193 curl_easy_setopt(preq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite);
2194 curl_easy_setopt(preq->slot->curl, CURLOPT_URL, preq->url);
2195 curl_easy_setopt(preq->slot->curl, CURLOPT_HTTPHEADER,
2196 no_pragma_header);
2197
2198 /*
2199 * If there is data present from a previous transfer attempt,
2200 * resume where it left off
2201 */
2202 prev_posn = ftello(preq->packfile);
2203 if (prev_posn>0) {
2204 if (http_is_verbose)
2205 fprintf(stderr,
2206 "Resuming fetch of pack %s at byte %"PRIuMAX"\n",
2207 hash_to_hex(packed_git_hash),
2208 (uintmax_t)prev_posn);
2209 http_opt_request_remainder(preq->slot->curl, prev_posn);
2210 }
2211
2212 return preq;
2213
2214 abort:
2215 strbuf_release(&preq->tmpfile);
2216 free(preq->url);
2217 free(preq);
2218 return NULL;
2219 }
2220
2221 /* Helpers for fetching objects (loose) */
fwrite_sha1_file(char * ptr,size_t eltsize,size_t nmemb,void * data)2222 static size_t fwrite_sha1_file(char *ptr, size_t eltsize, size_t nmemb,
2223 void *data)
2224 {
2225 unsigned char expn[4096];
2226 size_t size = eltsize * nmemb;
2227 int posn = 0;
2228 struct http_object_request *freq = data;
2229 struct active_request_slot *slot = freq->slot;
2230
2231 if (slot) {
2232 CURLcode c = curl_easy_getinfo(slot->curl, CURLINFO_HTTP_CODE,
2233 &slot->http_code);
2234 if (c != CURLE_OK)
2235 BUG("curl_easy_getinfo for HTTP code failed: %s",
2236 curl_easy_strerror(c));
2237 if (slot->http_code >= 300)
2238 return nmemb;
2239 }
2240
2241 do {
2242 ssize_t retval = xwrite(freq->localfile,
2243 (char *) ptr + posn, size - posn);
2244 if (retval < 0)
2245 return posn / eltsize;
2246 posn += retval;
2247 } while (posn < size);
2248
2249 freq->stream.avail_in = size;
2250 freq->stream.next_in = (void *)ptr;
2251 do {
2252 freq->stream.next_out = expn;
2253 freq->stream.avail_out = sizeof(expn);
2254 freq->zret = git_inflate(&freq->stream, Z_SYNC_FLUSH);
2255 the_hash_algo->update_fn(&freq->c, expn,
2256 sizeof(expn) - freq->stream.avail_out);
2257 } while (freq->stream.avail_in && freq->zret == Z_OK);
2258 return nmemb;
2259 }
2260
new_http_object_request(const char * base_url,const struct object_id * oid)2261 struct http_object_request *new_http_object_request(const char *base_url,
2262 const struct object_id *oid)
2263 {
2264 char *hex = oid_to_hex(oid);
2265 struct strbuf filename = STRBUF_INIT;
2266 struct strbuf prevfile = STRBUF_INIT;
2267 int prevlocal;
2268 char prev_buf[PREV_BUF_SIZE];
2269 ssize_t prev_read = 0;
2270 off_t prev_posn = 0;
2271 struct http_object_request *freq;
2272
2273 CALLOC_ARRAY(freq, 1);
2274 strbuf_init(&freq->tmpfile, 0);
2275 oidcpy(&freq->oid, oid);
2276 freq->localfile = -1;
2277
2278 loose_object_path(the_repository, &filename, oid);
2279 strbuf_addf(&freq->tmpfile, "%s.temp", filename.buf);
2280
2281 strbuf_addf(&prevfile, "%s.prev", filename.buf);
2282 unlink_or_warn(prevfile.buf);
2283 rename(freq->tmpfile.buf, prevfile.buf);
2284 unlink_or_warn(freq->tmpfile.buf);
2285 strbuf_release(&filename);
2286
2287 if (freq->localfile != -1)
2288 error("fd leakage in start: %d", freq->localfile);
2289 freq->localfile = open(freq->tmpfile.buf,
2290 O_WRONLY | O_CREAT | O_EXCL, 0666);
2291 /*
2292 * This could have failed due to the "lazy directory creation";
2293 * try to mkdir the last path component.
2294 */
2295 if (freq->localfile < 0 && errno == ENOENT) {
2296 char *dir = strrchr(freq->tmpfile.buf, '/');
2297 if (dir) {
2298 *dir = 0;
2299 mkdir(freq->tmpfile.buf, 0777);
2300 *dir = '/';
2301 }
2302 freq->localfile = open(freq->tmpfile.buf,
2303 O_WRONLY | O_CREAT | O_EXCL, 0666);
2304 }
2305
2306 if (freq->localfile < 0) {
2307 error_errno("Couldn't create temporary file %s",
2308 freq->tmpfile.buf);
2309 goto abort;
2310 }
2311
2312 git_inflate_init(&freq->stream);
2313
2314 the_hash_algo->init_fn(&freq->c);
2315
2316 freq->url = get_remote_object_url(base_url, hex, 0);
2317
2318 /*
2319 * If a previous temp file is present, process what was already
2320 * fetched.
2321 */
2322 prevlocal = open(prevfile.buf, O_RDONLY);
2323 if (prevlocal != -1) {
2324 do {
2325 prev_read = xread(prevlocal, prev_buf, PREV_BUF_SIZE);
2326 if (prev_read>0) {
2327 if (fwrite_sha1_file(prev_buf,
2328 1,
2329 prev_read,
2330 freq) == prev_read) {
2331 prev_posn += prev_read;
2332 } else {
2333 prev_read = -1;
2334 }
2335 }
2336 } while (prev_read > 0);
2337 close(prevlocal);
2338 }
2339 unlink_or_warn(prevfile.buf);
2340 strbuf_release(&prevfile);
2341
2342 /*
2343 * Reset inflate/SHA1 if there was an error reading the previous temp
2344 * file; also rewind to the beginning of the local file.
2345 */
2346 if (prev_read == -1) {
2347 memset(&freq->stream, 0, sizeof(freq->stream));
2348 git_inflate_init(&freq->stream);
2349 the_hash_algo->init_fn(&freq->c);
2350 if (prev_posn>0) {
2351 prev_posn = 0;
2352 lseek(freq->localfile, 0, SEEK_SET);
2353 if (ftruncate(freq->localfile, 0) < 0) {
2354 error_errno("Couldn't truncate temporary file %s",
2355 freq->tmpfile.buf);
2356 goto abort;
2357 }
2358 }
2359 }
2360
2361 freq->slot = get_active_slot();
2362
2363 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEDATA, freq);
2364 curl_easy_setopt(freq->slot->curl, CURLOPT_FAILONERROR, 0);
2365 curl_easy_setopt(freq->slot->curl, CURLOPT_WRITEFUNCTION, fwrite_sha1_file);
2366 curl_easy_setopt(freq->slot->curl, CURLOPT_ERRORBUFFER, freq->errorstr);
2367 curl_easy_setopt(freq->slot->curl, CURLOPT_URL, freq->url);
2368 curl_easy_setopt(freq->slot->curl, CURLOPT_HTTPHEADER, no_pragma_header);
2369
2370 /*
2371 * If we have successfully processed data from a previous fetch
2372 * attempt, only fetch the data we don't already have.
2373 */
2374 if (prev_posn>0) {
2375 if (http_is_verbose)
2376 fprintf(stderr,
2377 "Resuming fetch of object %s at byte %"PRIuMAX"\n",
2378 hex, (uintmax_t)prev_posn);
2379 http_opt_request_remainder(freq->slot->curl, prev_posn);
2380 }
2381
2382 return freq;
2383
2384 abort:
2385 strbuf_release(&prevfile);
2386 free(freq->url);
2387 free(freq);
2388 return NULL;
2389 }
2390
process_http_object_request(struct http_object_request * freq)2391 void process_http_object_request(struct http_object_request *freq)
2392 {
2393 if (freq->slot == NULL)
2394 return;
2395 freq->curl_result = freq->slot->curl_result;
2396 freq->http_code = freq->slot->http_code;
2397 freq->slot = NULL;
2398 }
2399
finish_http_object_request(struct http_object_request * freq)2400 int finish_http_object_request(struct http_object_request *freq)
2401 {
2402 struct stat st;
2403 struct strbuf filename = STRBUF_INIT;
2404
2405 close(freq->localfile);
2406 freq->localfile = -1;
2407
2408 process_http_object_request(freq);
2409
2410 if (freq->http_code == 416) {
2411 warning("requested range invalid; we may already have all the data.");
2412 } else if (freq->curl_result != CURLE_OK) {
2413 if (stat(freq->tmpfile.buf, &st) == 0)
2414 if (st.st_size == 0)
2415 unlink_or_warn(freq->tmpfile.buf);
2416 return -1;
2417 }
2418
2419 git_inflate_end(&freq->stream);
2420 the_hash_algo->final_oid_fn(&freq->real_oid, &freq->c);
2421 if (freq->zret != Z_STREAM_END) {
2422 unlink_or_warn(freq->tmpfile.buf);
2423 return -1;
2424 }
2425 if (!oideq(&freq->oid, &freq->real_oid)) {
2426 unlink_or_warn(freq->tmpfile.buf);
2427 return -1;
2428 }
2429 loose_object_path(the_repository, &filename, &freq->oid);
2430 freq->rename = finalize_object_file(freq->tmpfile.buf, filename.buf);
2431 strbuf_release(&filename);
2432
2433 return freq->rename;
2434 }
2435
abort_http_object_request(struct http_object_request * freq)2436 void abort_http_object_request(struct http_object_request *freq)
2437 {
2438 unlink_or_warn(freq->tmpfile.buf);
2439
2440 release_http_object_request(freq);
2441 }
2442
release_http_object_request(struct http_object_request * freq)2443 void release_http_object_request(struct http_object_request *freq)
2444 {
2445 if (freq->localfile != -1) {
2446 close(freq->localfile);
2447 freq->localfile = -1;
2448 }
2449 FREE_AND_NULL(freq->url);
2450 if (freq->slot != NULL) {
2451 freq->slot->callback_func = NULL;
2452 freq->slot->callback_data = NULL;
2453 release_active_slot(freq->slot);
2454 freq->slot = NULL;
2455 }
2456 strbuf_release(&freq->tmpfile);
2457 }
2458