1 | /*************************************************************************** |
2 | * _ _ ____ _ |
3 | * Project ___| | | | _ \| | |
4 | * / __| | | | |_) | | |
5 | * | (__| |_| | _ <| |___ |
6 | * \___|\___/|_| \_\_____| |
7 | * |
8 | * Copyright (C) 1998 - 2022, Daniel Stenberg, <[email protected]>, et al. |
9 | * |
10 | * This software is licensed as described in the file COPYING, which |
11 | * you should have received as part of this distribution. The terms |
12 | * are also available at https://curl.se/docs/copyright.html. |
13 | * |
14 | * You may opt to use, copy, modify, merge, publish, distribute and/or sell |
15 | * copies of the Software, and permit persons to whom the Software is |
16 | * furnished to do so, under the terms of the COPYING file. |
17 | * |
18 | * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY |
19 | * KIND, either express or implied. |
20 | * |
21 | * SPDX-License-Identifier: curl |
22 | * |
23 | ***************************************************************************/ |
24 | |
25 | #include "curl_setup.h" |
26 | |
27 | #ifdef USE_NGHTTP2 |
28 | #include <nghttp2/nghttp2.h> |
29 | #include "urldata.h" |
30 | #include "http2.h" |
31 | #include "http.h" |
32 | #include "sendf.h" |
33 | #include "select.h" |
34 | #include "curl_base64.h" |
35 | #include "strcase.h" |
36 | #include "multiif.h" |
37 | #include "url.h" |
38 | #include "connect.h" |
39 | #include "strtoofft.h" |
40 | #include "strdup.h" |
41 | #include "transfer.h" |
42 | #include "dynbuf.h" |
43 | #include "h2h3.h" |
44 | #include "headers.h" |
45 | /* The last 3 #include files should be in this order */ |
46 | #include "curl_printf.h" |
47 | #include "curl_memory.h" |
48 | #include "memdebug.h" |
49 | |
50 | #define H2_BUFSIZE 32768 |
51 | |
52 | #if (NGHTTP2_VERSION_NUM < 0x010c00) |
53 | #error too old nghttp2 version, upgrade! |
54 | #endif |
55 | |
56 | #ifdef CURL_DISABLE_VERBOSE_STRINGS |
57 | #define nghttp2_session_callbacks_set_error_callback(x,y) |
58 | #endif |
59 | |
60 | #if (NGHTTP2_VERSION_NUM >= 0x010c00) |
61 | #define NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE 1 |
62 | #endif |
63 | |
64 | #define HTTP2_HUGE_WINDOW_SIZE (32 * 1024 * 1024) /* 32 MB */ |
65 | |
66 | #ifdef DEBUG_HTTP2 |
67 | #define H2BUGF(x) x |
68 | #else |
69 | #define H2BUGF(x) do { } while(0) |
70 | #endif |
71 | |
72 | static ssize_t http2_recv(struct Curl_easy *data, int sockindex, |
73 | char *mem, size_t len, CURLcode *err); |
74 | static bool http2_connisdead(struct Curl_easy *data, |
75 | struct connectdata *conn); |
76 | static int h2_session_send(struct Curl_easy *data, |
77 | nghttp2_session *h2); |
78 | static int h2_process_pending_input(struct Curl_easy *data, |
79 | struct http_conn *httpc, |
80 | CURLcode *err); |
81 | |
82 | /* |
83 | * Curl_http2_init_state() is called when the easy handle is created and |
84 | * allows for HTTP/2 specific init of state. |
85 | */ |
86 | void Curl_http2_init_state(struct UrlState *state) |
87 | { |
88 | state->stream_weight = NGHTTP2_DEFAULT_WEIGHT; |
89 | } |
90 | |
91 | /* |
92 | * Curl_http2_init_userset() is called when the easy handle is created and |
93 | * allows for HTTP/2 specific user-set fields. |
94 | */ |
95 | void Curl_http2_init_userset(struct UserDefined *set) |
96 | { |
97 | set->stream_weight = NGHTTP2_DEFAULT_WEIGHT; |
98 | } |
99 | |
100 | static int http2_getsock(struct Curl_easy *data, |
101 | struct connectdata *conn, |
102 | curl_socket_t *sock) |
103 | { |
104 | const struct http_conn *c = &conn->proto.httpc; |
105 | struct SingleRequest *k = &data->req; |
106 | int bitmap = GETSOCK_BLANK; |
107 | struct HTTP *stream = data->req.p.http; |
108 | |
109 | sock[0] = conn->sock[FIRSTSOCKET]; |
110 | |
111 | if(!(k->keepon & KEEP_RECV_PAUSE)) |
112 | /* Unless paused - in a HTTP/2 connection we can basically always get a |
113 | frame so we should always be ready for one */ |
114 | bitmap |= GETSOCK_READSOCK(FIRSTSOCKET); |
115 | |
116 | /* we're (still uploading OR the HTTP/2 layer wants to send data) AND |
117 | there's a window to send data in */ |
118 | if((((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND) || |
119 | nghttp2_session_want_write(c->h2)) && |
120 | (nghttp2_session_get_remote_window_size(c->h2) && |
121 | nghttp2_session_get_stream_remote_window_size(c->h2, |
122 | stream->stream_id))) |
123 | bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET); |
124 | |
125 | return bitmap; |
126 | } |
127 | |
128 | /* |
129 | * http2_stream_free() free HTTP2 stream related data |
130 | */ |
131 | static void http2_stream_free(struct HTTP *http) |
132 | { |
133 | if(http) { |
134 | Curl_dyn_free(&http->header_recvbuf); |
135 | for(; http->push_headers_used > 0; --http->push_headers_used) { |
136 | free(http->push_headers[http->push_headers_used - 1]); |
137 | } |
138 | free(http->push_headers); |
139 | http->push_headers = NULL; |
140 | } |
141 | } |
142 | |
143 | /* |
144 | * Disconnects *a* connection used for HTTP/2. It might be an old one from the |
145 | * connection cache and not the "main" one. Don't touch the easy handle! |
146 | */ |
147 | |
148 | static CURLcode http2_disconnect(struct Curl_easy *data, |
149 | struct connectdata *conn, |
150 | bool dead_connection) |
151 | { |
152 | struct http_conn *c = &conn->proto.httpc; |
153 | (void)dead_connection; |
154 | #ifndef DEBUG_HTTP2 |
155 | (void)data; |
156 | #endif |
157 | |
158 | H2BUGF(infof(data, "HTTP/2 DISCONNECT starts now" )); |
159 | |
160 | nghttp2_session_del(c->h2); |
161 | Curl_safefree(c->inbuf); |
162 | |
163 | H2BUGF(infof(data, "HTTP/2 DISCONNECT done" )); |
164 | |
165 | return CURLE_OK; |
166 | } |
167 | |
168 | /* |
169 | * The server may send us data at any point (e.g. PING frames). Therefore, |
170 | * we cannot assume that an HTTP/2 socket is dead just because it is readable. |
171 | * |
172 | * Instead, if it is readable, run Curl_connalive() to peek at the socket |
173 | * and distinguish between closed and data. |
174 | */ |
175 | static bool http2_connisdead(struct Curl_easy *data, struct connectdata *conn) |
176 | { |
177 | int sval; |
178 | bool dead = TRUE; |
179 | |
180 | if(conn->bits.close) |
181 | return TRUE; |
182 | |
183 | sval = SOCKET_READABLE(conn->sock[FIRSTSOCKET], 0); |
184 | if(sval == 0) { |
185 | /* timeout */ |
186 | dead = FALSE; |
187 | } |
188 | else if(sval & CURL_CSELECT_ERR) { |
189 | /* socket is in an error state */ |
190 | dead = TRUE; |
191 | } |
192 | else if(sval & CURL_CSELECT_IN) { |
193 | /* readable with no error. could still be closed */ |
194 | dead = !Curl_connalive(conn); |
195 | if(!dead) { |
196 | /* This happens before we've sent off a request and the connection is |
197 | not in use by any other transfer, there shouldn't be any data here, |
198 | only "protocol frames" */ |
199 | CURLcode result; |
200 | struct http_conn *httpc = &conn->proto.httpc; |
201 | ssize_t nread = -1; |
202 | if(httpc->recv_underlying) |
203 | /* if called "too early", this pointer isn't setup yet! */ |
204 | nread = ((Curl_recv *)httpc->recv_underlying)( |
205 | data, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result); |
206 | if(nread != -1) { |
207 | H2BUGF(infof(data, |
208 | "%d bytes stray data read before trying h2 connection" , |
209 | (int)nread)); |
210 | httpc->nread_inbuf = 0; |
211 | httpc->inbuflen = nread; |
212 | if(h2_process_pending_input(data, httpc, &result) < 0) |
213 | /* immediate error, considered dead */ |
214 | dead = TRUE; |
215 | } |
216 | else |
217 | /* the read failed so let's say this is dead anyway */ |
218 | dead = TRUE; |
219 | } |
220 | } |
221 | |
222 | return dead; |
223 | } |
224 | |
225 | /* |
226 | * Set the transfer that is currently using this HTTP/2 connection. |
227 | */ |
228 | static void set_transfer(struct http_conn *c, |
229 | struct Curl_easy *data) |
230 | { |
231 | c->trnsfr = data; |
232 | } |
233 | |
234 | /* |
235 | * Get the transfer that is currently using this HTTP/2 connection. |
236 | */ |
237 | static struct Curl_easy *get_transfer(struct http_conn *c) |
238 | { |
239 | DEBUGASSERT(c && c->trnsfr); |
240 | return c->trnsfr; |
241 | } |
242 | |
243 | static unsigned int http2_conncheck(struct Curl_easy *data, |
244 | struct connectdata *conn, |
245 | unsigned int checks_to_perform) |
246 | { |
247 | unsigned int ret_val = CONNRESULT_NONE; |
248 | struct http_conn *c = &conn->proto.httpc; |
249 | int rc; |
250 | bool send_frames = false; |
251 | |
252 | if(checks_to_perform & CONNCHECK_ISDEAD) { |
253 | if(http2_connisdead(data, conn)) |
254 | ret_val |= CONNRESULT_DEAD; |
255 | } |
256 | |
257 | if(checks_to_perform & CONNCHECK_KEEPALIVE) { |
258 | struct curltime now = Curl_now(); |
259 | timediff_t elapsed = Curl_timediff(now, conn->keepalive); |
260 | |
261 | if(elapsed > data->set.upkeep_interval_ms) { |
262 | /* Perform an HTTP/2 PING */ |
263 | rc = nghttp2_submit_ping(c->h2, 0, ZERO_NULL); |
264 | if(!rc) { |
265 | /* Successfully added a PING frame to the session. Need to flag this |
266 | so the frame is sent. */ |
267 | send_frames = true; |
268 | } |
269 | else { |
270 | failf(data, "nghttp2_submit_ping() failed: %s(%d)" , |
271 | nghttp2_strerror(rc), rc); |
272 | } |
273 | |
274 | conn->keepalive = now; |
275 | } |
276 | } |
277 | |
278 | if(send_frames) { |
279 | set_transfer(c, data); /* set the transfer */ |
280 | rc = nghttp2_session_send(c->h2); |
281 | if(rc) |
282 | failf(data, "nghttp2_session_send() failed: %s(%d)" , |
283 | nghttp2_strerror(rc), rc); |
284 | } |
285 | |
286 | return ret_val; |
287 | } |
288 | |
289 | /* called from http_setup_conn */ |
290 | void Curl_http2_setup_req(struct Curl_easy *data) |
291 | { |
292 | struct HTTP *http = data->req.p.http; |
293 | http->bodystarted = FALSE; |
294 | http->status_code = -1; |
295 | http->pausedata = NULL; |
296 | http->pauselen = 0; |
297 | http->closed = FALSE; |
298 | http->close_handled = FALSE; |
299 | http->mem = NULL; |
300 | http->len = 0; |
301 | http->memlen = 0; |
302 | http->error = NGHTTP2_NO_ERROR; |
303 | } |
304 | |
305 | /* called from http_setup_conn */ |
306 | void Curl_http2_setup_conn(struct connectdata *conn) |
307 | { |
308 | conn->proto.httpc.settings.max_concurrent_streams = |
309 | DEFAULT_MAX_CONCURRENT_STREAMS; |
310 | } |
311 | |
312 | /* |
313 | * HTTP2 handler interface. This isn't added to the general list of protocols |
314 | * but will be used at run-time when the protocol is dynamically switched from |
315 | * HTTP to HTTP2. |
316 | */ |
317 | static const struct Curl_handler Curl_handler_http2 = { |
318 | "HTTP" , /* scheme */ |
319 | ZERO_NULL, /* setup_connection */ |
320 | Curl_http, /* do_it */ |
321 | Curl_http_done, /* done */ |
322 | ZERO_NULL, /* do_more */ |
323 | ZERO_NULL, /* connect_it */ |
324 | ZERO_NULL, /* connecting */ |
325 | ZERO_NULL, /* doing */ |
326 | http2_getsock, /* proto_getsock */ |
327 | http2_getsock, /* doing_getsock */ |
328 | ZERO_NULL, /* domore_getsock */ |
329 | http2_getsock, /* perform_getsock */ |
330 | http2_disconnect, /* disconnect */ |
331 | ZERO_NULL, /* readwrite */ |
332 | http2_conncheck, /* connection_check */ |
333 | ZERO_NULL, /* attach connection */ |
334 | PORT_HTTP, /* defport */ |
335 | CURLPROTO_HTTP, /* protocol */ |
336 | CURLPROTO_HTTP, /* family */ |
337 | PROTOPT_STREAM /* flags */ |
338 | }; |
339 | |
340 | static const struct Curl_handler Curl_handler_http2_ssl = { |
341 | "HTTPS" , /* scheme */ |
342 | ZERO_NULL, /* setup_connection */ |
343 | Curl_http, /* do_it */ |
344 | Curl_http_done, /* done */ |
345 | ZERO_NULL, /* do_more */ |
346 | ZERO_NULL, /* connect_it */ |
347 | ZERO_NULL, /* connecting */ |
348 | ZERO_NULL, /* doing */ |
349 | http2_getsock, /* proto_getsock */ |
350 | http2_getsock, /* doing_getsock */ |
351 | ZERO_NULL, /* domore_getsock */ |
352 | http2_getsock, /* perform_getsock */ |
353 | http2_disconnect, /* disconnect */ |
354 | ZERO_NULL, /* readwrite */ |
355 | http2_conncheck, /* connection_check */ |
356 | ZERO_NULL, /* attach connection */ |
357 | PORT_HTTP, /* defport */ |
358 | CURLPROTO_HTTPS, /* protocol */ |
359 | CURLPROTO_HTTP, /* family */ |
360 | PROTOPT_SSL | PROTOPT_STREAM /* flags */ |
361 | }; |
362 | |
363 | /* |
364 | * Store nghttp2 version info in this buffer. |
365 | */ |
366 | void Curl_http2_ver(char *p, size_t len) |
367 | { |
368 | nghttp2_info *h2 = nghttp2_version(0); |
369 | (void)msnprintf(p, len, "nghttp2/%s" , h2->version_str); |
370 | } |
371 | |
372 | /* |
373 | * The implementation of nghttp2_send_callback type. Here we write |data| with |
374 | * size |length| to the network and return the number of bytes actually |
375 | * written. See the documentation of nghttp2_send_callback for the details. |
376 | */ |
377 | static ssize_t send_callback(nghttp2_session *h2, |
378 | const uint8_t *mem, size_t length, int flags, |
379 | void *userp) |
380 | { |
381 | struct connectdata *conn = (struct connectdata *)userp; |
382 | struct http_conn *c = &conn->proto.httpc; |
383 | struct Curl_easy *data = get_transfer(c); |
384 | ssize_t written; |
385 | CURLcode result = CURLE_OK; |
386 | |
387 | (void)h2; |
388 | (void)flags; |
389 | |
390 | if(!c->send_underlying) |
391 | /* called before setup properly! */ |
392 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
393 | |
394 | written = ((Curl_send*)c->send_underlying)(data, FIRSTSOCKET, |
395 | mem, length, &result); |
396 | |
397 | if(result == CURLE_AGAIN) { |
398 | return NGHTTP2_ERR_WOULDBLOCK; |
399 | } |
400 | |
401 | if(written == -1) { |
402 | failf(data, "Failed sending HTTP2 data" ); |
403 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
404 | } |
405 | |
406 | if(!written) |
407 | return NGHTTP2_ERR_WOULDBLOCK; |
408 | |
409 | return written; |
410 | } |
411 | |
412 | |
413 | /* We pass a pointer to this struct in the push callback, but the contents of |
414 | the struct are hidden from the user. */ |
415 | struct curl_pushheaders { |
416 | struct Curl_easy *data; |
417 | const nghttp2_push_promise *frame; |
418 | }; |
419 | |
420 | /* |
421 | * push header access function. Only to be used from within the push callback |
422 | */ |
423 | char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num) |
424 | { |
425 | /* Verify that we got a good easy handle in the push header struct, mostly to |
426 | detect rubbish input fast(er). */ |
427 | if(!h || !GOOD_EASY_HANDLE(h->data)) |
428 | return NULL; |
429 | else { |
430 | struct HTTP *stream = h->data->req.p.http; |
431 | if(num < stream->push_headers_used) |
432 | return stream->push_headers[num]; |
433 | } |
434 | return NULL; |
435 | } |
436 | |
437 | /* |
438 | * push header access function. Only to be used from within the push callback |
439 | */ |
440 | char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header) |
441 | { |
442 | /* Verify that we got a good easy handle in the push header struct, |
443 | mostly to detect rubbish input fast(er). Also empty header name |
444 | is just a rubbish too. We have to allow ":" at the beginning of |
445 | the header, but header == ":" must be rejected. If we have ':' in |
446 | the middle of header, it could be matched in middle of the value, |
447 | this is because we do prefix match.*/ |
448 | if(!h || !GOOD_EASY_HANDLE(h->data) || !header || !header[0] || |
449 | !strcmp(header, ":" ) || strchr(header + 1, ':')) |
450 | return NULL; |
451 | else { |
452 | struct HTTP *stream = h->data->req.p.http; |
453 | size_t len = strlen(header); |
454 | size_t i; |
455 | for(i = 0; i<stream->push_headers_used; i++) { |
456 | if(!strncmp(header, stream->push_headers[i], len)) { |
457 | /* sub-match, make sure that it is followed by a colon */ |
458 | if(stream->push_headers[i][len] != ':') |
459 | continue; |
460 | return &stream->push_headers[i][len + 1]; |
461 | } |
462 | } |
463 | } |
464 | return NULL; |
465 | } |
466 | |
467 | /* |
468 | * This specific transfer on this connection has been "drained". |
469 | */ |
470 | static void drained_transfer(struct Curl_easy *data, |
471 | struct http_conn *httpc) |
472 | { |
473 | DEBUGASSERT(httpc->drain_total >= data->state.drain); |
474 | httpc->drain_total -= data->state.drain; |
475 | data->state.drain = 0; |
476 | } |
477 | |
478 | /* |
479 | * Mark this transfer to get "drained". |
480 | */ |
481 | static void drain_this(struct Curl_easy *data, |
482 | struct http_conn *httpc) |
483 | { |
484 | data->state.drain++; |
485 | httpc->drain_total++; |
486 | DEBUGASSERT(httpc->drain_total >= data->state.drain); |
487 | } |
488 | |
489 | static struct Curl_easy *duphandle(struct Curl_easy *data) |
490 | { |
491 | struct Curl_easy *second = curl_easy_duphandle(data); |
492 | if(second) { |
493 | /* setup the request struct */ |
494 | struct HTTP *http = calloc(1, sizeof(struct HTTP)); |
495 | if(!http) { |
496 | (void)Curl_close(&second); |
497 | } |
498 | else { |
499 | second->req.p.http = http; |
500 | Curl_dyn_init(&http->header_recvbuf, DYN_H2_HEADERS); |
501 | Curl_http2_setup_req(second); |
502 | second->state.stream_weight = data->state.stream_weight; |
503 | } |
504 | } |
505 | return second; |
506 | } |
507 | |
508 | static int set_transfer_url(struct Curl_easy *data, |
509 | struct curl_pushheaders *hp) |
510 | { |
511 | const char *v; |
512 | CURLUcode uc; |
513 | char *url = NULL; |
514 | int rc = 0; |
515 | CURLU *u = curl_url(); |
516 | |
517 | if(!u) |
518 | return 5; |
519 | |
520 | v = curl_pushheader_byname(hp, H2H3_PSEUDO_SCHEME); |
521 | if(v) { |
522 | uc = curl_url_set(u, CURLUPART_SCHEME, v, 0); |
523 | if(uc) { |
524 | rc = 1; |
525 | goto fail; |
526 | } |
527 | } |
528 | |
529 | v = curl_pushheader_byname(hp, H2H3_PSEUDO_AUTHORITY); |
530 | if(v) { |
531 | uc = curl_url_set(u, CURLUPART_HOST, v, 0); |
532 | if(uc) { |
533 | rc = 2; |
534 | goto fail; |
535 | } |
536 | } |
537 | |
538 | v = curl_pushheader_byname(hp, H2H3_PSEUDO_PATH); |
539 | if(v) { |
540 | uc = curl_url_set(u, CURLUPART_PATH, v, 0); |
541 | if(uc) { |
542 | rc = 3; |
543 | goto fail; |
544 | } |
545 | } |
546 | |
547 | uc = curl_url_get(u, CURLUPART_URL, &url, 0); |
548 | if(uc) |
549 | rc = 4; |
550 | fail: |
551 | curl_url_cleanup(u); |
552 | if(rc) |
553 | return rc; |
554 | |
555 | if(data->state.url_alloc) |
556 | free(data->state.url); |
557 | data->state.url_alloc = TRUE; |
558 | data->state.url = url; |
559 | return 0; |
560 | } |
561 | |
562 | static int push_promise(struct Curl_easy *data, |
563 | struct connectdata *conn, |
564 | const nghttp2_push_promise *frame) |
565 | { |
566 | int rv; /* one of the CURL_PUSH_* defines */ |
567 | H2BUGF(infof(data, "PUSH_PROMISE received, stream %u" , |
568 | frame->promised_stream_id)); |
569 | if(data->multi->push_cb) { |
570 | struct HTTP *stream; |
571 | struct HTTP *newstream; |
572 | struct curl_pushheaders heads; |
573 | CURLMcode rc; |
574 | struct http_conn *httpc; |
575 | size_t i; |
576 | /* clone the parent */ |
577 | struct Curl_easy *newhandle = duphandle(data); |
578 | if(!newhandle) { |
579 | infof(data, "failed to duplicate handle" ); |
580 | rv = CURL_PUSH_DENY; /* FAIL HARD */ |
581 | goto fail; |
582 | } |
583 | |
584 | heads.data = data; |
585 | heads.frame = frame; |
586 | /* ask the application */ |
587 | H2BUGF(infof(data, "Got PUSH_PROMISE, ask application" )); |
588 | |
589 | stream = data->req.p.http; |
590 | if(!stream) { |
591 | failf(data, "Internal NULL stream" ); |
592 | (void)Curl_close(&newhandle); |
593 | rv = CURL_PUSH_DENY; |
594 | goto fail; |
595 | } |
596 | |
597 | rv = set_transfer_url(newhandle, &heads); |
598 | if(rv) { |
599 | (void)Curl_close(&newhandle); |
600 | rv = CURL_PUSH_DENY; |
601 | goto fail; |
602 | } |
603 | |
604 | Curl_set_in_callback(data, true); |
605 | rv = data->multi->push_cb(data, newhandle, |
606 | stream->push_headers_used, &heads, |
607 | data->multi->push_userp); |
608 | Curl_set_in_callback(data, false); |
609 | |
610 | /* free the headers again */ |
611 | for(i = 0; i<stream->push_headers_used; i++) |
612 | free(stream->push_headers[i]); |
613 | free(stream->push_headers); |
614 | stream->push_headers = NULL; |
615 | stream->push_headers_used = 0; |
616 | |
617 | if(rv) { |
618 | DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT)); |
619 | /* denied, kill off the new handle again */ |
620 | http2_stream_free(newhandle->req.p.http); |
621 | newhandle->req.p.http = NULL; |
622 | (void)Curl_close(&newhandle); |
623 | goto fail; |
624 | } |
625 | |
626 | newstream = newhandle->req.p.http; |
627 | newstream->stream_id = frame->promised_stream_id; |
628 | newhandle->req.maxdownload = -1; |
629 | newhandle->req.size = -1; |
630 | |
631 | /* approved, add to the multi handle and immediately switch to PERFORM |
632 | state with the given connection !*/ |
633 | rc = Curl_multi_add_perform(data->multi, newhandle, conn); |
634 | if(rc) { |
635 | infof(data, "failed to add handle to multi" ); |
636 | http2_stream_free(newhandle->req.p.http); |
637 | newhandle->req.p.http = NULL; |
638 | Curl_close(&newhandle); |
639 | rv = CURL_PUSH_DENY; |
640 | goto fail; |
641 | } |
642 | |
643 | httpc = &conn->proto.httpc; |
644 | rv = nghttp2_session_set_stream_user_data(httpc->h2, |
645 | frame->promised_stream_id, |
646 | newhandle); |
647 | if(rv) { |
648 | infof(data, "failed to set user_data for stream %u" , |
649 | frame->promised_stream_id); |
650 | DEBUGASSERT(0); |
651 | rv = CURL_PUSH_DENY; |
652 | goto fail; |
653 | } |
654 | Curl_dyn_init(&newstream->header_recvbuf, DYN_H2_HEADERS); |
655 | Curl_dyn_init(&newstream->trailer_recvbuf, DYN_H2_TRAILERS); |
656 | } |
657 | else { |
658 | H2BUGF(infof(data, "Got PUSH_PROMISE, ignore it" )); |
659 | rv = CURL_PUSH_DENY; |
660 | } |
661 | fail: |
662 | return rv; |
663 | } |
664 | |
665 | /* |
666 | * multi_connchanged() is called to tell that there is a connection in |
667 | * this multi handle that has changed state (multiplexing become possible, the |
668 | * number of allowed streams changed or similar), and a subsequent use of this |
669 | * multi handle should move CONNECT_PEND handles back to CONNECT to have them |
670 | * retry. |
671 | */ |
672 | static void multi_connchanged(struct Curl_multi *multi) |
673 | { |
674 | multi->recheckstate = TRUE; |
675 | } |
676 | |
677 | static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame, |
678 | void *userp) |
679 | { |
680 | struct connectdata *conn = (struct connectdata *)userp; |
681 | struct http_conn *httpc = &conn->proto.httpc; |
682 | struct Curl_easy *data_s = NULL; |
683 | struct HTTP *stream = NULL; |
684 | struct Curl_easy *data = get_transfer(httpc); |
685 | int rv; |
686 | size_t left, ncopy; |
687 | int32_t stream_id = frame->hd.stream_id; |
688 | CURLcode result; |
689 | |
690 | if(!stream_id) { |
691 | /* stream ID zero is for connection-oriented stuff */ |
692 | if(frame->hd.type == NGHTTP2_SETTINGS) { |
693 | uint32_t max_conn = httpc->settings.max_concurrent_streams; |
694 | H2BUGF(infof(data, "Got SETTINGS" )); |
695 | httpc->settings.max_concurrent_streams = |
696 | nghttp2_session_get_remote_settings( |
697 | session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS); |
698 | httpc->settings.enable_push = |
699 | nghttp2_session_get_remote_settings( |
700 | session, NGHTTP2_SETTINGS_ENABLE_PUSH); |
701 | H2BUGF(infof(data, "MAX_CONCURRENT_STREAMS == %d" , |
702 | httpc->settings.max_concurrent_streams)); |
703 | H2BUGF(infof(data, "ENABLE_PUSH == %s" , |
704 | httpc->settings.enable_push?"TRUE" :"false" )); |
705 | if(max_conn != httpc->settings.max_concurrent_streams) { |
706 | /* only signal change if the value actually changed */ |
707 | infof(data, |
708 | "Connection state changed (MAX_CONCURRENT_STREAMS == %u)!" , |
709 | httpc->settings.max_concurrent_streams); |
710 | multi_connchanged(data->multi); |
711 | } |
712 | } |
713 | return 0; |
714 | } |
715 | data_s = nghttp2_session_get_stream_user_data(session, stream_id); |
716 | if(!data_s) { |
717 | H2BUGF(infof(data, |
718 | "No Curl_easy associated with stream: %u" , |
719 | stream_id)); |
720 | return 0; |
721 | } |
722 | |
723 | stream = data_s->req.p.http; |
724 | if(!stream) { |
725 | H2BUGF(infof(data_s, "No proto pointer for stream: %u" , |
726 | stream_id)); |
727 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
728 | } |
729 | |
730 | H2BUGF(infof(data_s, "on_frame_recv() header %x stream %u" , |
731 | frame->hd.type, stream_id)); |
732 | |
733 | switch(frame->hd.type) { |
734 | case NGHTTP2_DATA: |
735 | /* If body started on this stream, then receiving DATA is illegal. */ |
736 | if(!stream->bodystarted) { |
737 | rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, |
738 | stream_id, NGHTTP2_PROTOCOL_ERROR); |
739 | |
740 | if(nghttp2_is_fatal(rv)) { |
741 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
742 | } |
743 | } |
744 | break; |
745 | case NGHTTP2_HEADERS: |
746 | if(stream->bodystarted) { |
747 | /* Only valid HEADERS after body started is trailer HEADERS. We |
748 | buffer them in on_header callback. */ |
749 | break; |
750 | } |
751 | |
752 | /* nghttp2 guarantees that :status is received, and we store it to |
753 | stream->status_code. Fuzzing has proven this can still be reached |
754 | without status code having been set. */ |
755 | if(stream->status_code == -1) |
756 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
757 | |
758 | /* Only final status code signals the end of header */ |
759 | if(stream->status_code / 100 != 1) { |
760 | stream->bodystarted = TRUE; |
761 | stream->status_code = -1; |
762 | } |
763 | |
764 | result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("\r\n" )); |
765 | if(result) |
766 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
767 | |
768 | left = Curl_dyn_len(&stream->header_recvbuf) - |
769 | stream->nread_header_recvbuf; |
770 | ncopy = CURLMIN(stream->len, left); |
771 | |
772 | memcpy(&stream->mem[stream->memlen], |
773 | Curl_dyn_ptr(&stream->header_recvbuf) + |
774 | stream->nread_header_recvbuf, |
775 | ncopy); |
776 | stream->nread_header_recvbuf += ncopy; |
777 | |
778 | DEBUGASSERT(stream->mem); |
779 | H2BUGF(infof(data_s, "Store %zu bytes headers from stream %u at %p" , |
780 | ncopy, stream_id, stream->mem)); |
781 | |
782 | stream->len -= ncopy; |
783 | stream->memlen += ncopy; |
784 | |
785 | drain_this(data_s, httpc); |
786 | /* if we receive data for another handle, wake that up */ |
787 | if(get_transfer(httpc) != data_s) |
788 | Curl_expire(data_s, 0, EXPIRE_RUN_NOW); |
789 | break; |
790 | case NGHTTP2_PUSH_PROMISE: |
791 | rv = push_promise(data_s, conn, &frame->push_promise); |
792 | if(rv) { /* deny! */ |
793 | int h2; |
794 | DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT)); |
795 | h2 = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, |
796 | frame->push_promise.promised_stream_id, |
797 | NGHTTP2_CANCEL); |
798 | if(nghttp2_is_fatal(h2)) |
799 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
800 | else if(rv == CURL_PUSH_ERROROUT) { |
801 | DEBUGF(infof(data_s, "Fail the parent stream (too)" )); |
802 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
803 | } |
804 | } |
805 | break; |
806 | default: |
807 | H2BUGF(infof(data_s, "Got frame type %x for stream %u" , |
808 | frame->hd.type, stream_id)); |
809 | break; |
810 | } |
811 | return 0; |
812 | } |
813 | |
814 | static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags, |
815 | int32_t stream_id, |
816 | const uint8_t *mem, size_t len, void *userp) |
817 | { |
818 | struct HTTP *stream; |
819 | struct Curl_easy *data_s; |
820 | size_t nread; |
821 | struct connectdata *conn = (struct connectdata *)userp; |
822 | struct http_conn *httpc = &conn->proto.httpc; |
823 | (void)session; |
824 | (void)flags; |
825 | |
826 | DEBUGASSERT(stream_id); /* should never be a zero stream ID here */ |
827 | |
828 | /* get the stream from the hash based on Stream ID */ |
829 | data_s = nghttp2_session_get_stream_user_data(session, stream_id); |
830 | if(!data_s) { |
831 | /* Receiving a Stream ID not in the hash should not happen - unless |
832 | we have aborted a transfer artificially and there were more data |
833 | in the pipeline. Silently ignore. */ |
834 | H2BUGF(fprintf(stderr, "Data for stream %u but it doesn't exist\n" , |
835 | stream_id)); |
836 | return 0; |
837 | } |
838 | |
839 | stream = data_s->req.p.http; |
840 | if(!stream) |
841 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
842 | |
843 | nread = CURLMIN(stream->len, len); |
844 | memcpy(&stream->mem[stream->memlen], mem, nread); |
845 | |
846 | stream->len -= nread; |
847 | stream->memlen += nread; |
848 | |
849 | drain_this(data_s, &conn->proto.httpc); |
850 | |
851 | /* if we receive data for another handle, wake that up */ |
852 | if(get_transfer(httpc) != data_s) |
853 | Curl_expire(data_s, 0, EXPIRE_RUN_NOW); |
854 | |
855 | H2BUGF(infof(data_s, "%zu data received for stream %u " |
856 | "(%zu left in buffer %p, total %zu)" , |
857 | nread, stream_id, |
858 | stream->len, stream->mem, |
859 | stream->memlen)); |
860 | |
861 | if(nread < len) { |
862 | stream->pausedata = mem + nread; |
863 | stream->pauselen = len - nread; |
864 | H2BUGF(infof(data_s, "NGHTTP2_ERR_PAUSE - %zu bytes out of buffer" |
865 | ", stream %u" , |
866 | len - nread, stream_id)); |
867 | data_s->conn->proto.httpc.pause_stream_id = stream_id; |
868 | |
869 | return NGHTTP2_ERR_PAUSE; |
870 | } |
871 | |
872 | /* pause execution of nghttp2 if we received data for another handle |
873 | in order to process them first. */ |
874 | if(get_transfer(httpc) != data_s) { |
875 | data_s->conn->proto.httpc.pause_stream_id = stream_id; |
876 | |
877 | return NGHTTP2_ERR_PAUSE; |
878 | } |
879 | |
880 | return 0; |
881 | } |
882 | |
883 | static int on_stream_close(nghttp2_session *session, int32_t stream_id, |
884 | uint32_t error_code, void *userp) |
885 | { |
886 | struct Curl_easy *data_s; |
887 | struct HTTP *stream; |
888 | struct connectdata *conn = (struct connectdata *)userp; |
889 | int rv; |
890 | (void)session; |
891 | (void)stream_id; |
892 | |
893 | if(stream_id) { |
894 | struct http_conn *httpc; |
895 | /* get the stream from the hash based on Stream ID, stream ID zero is for |
896 | connection-oriented stuff */ |
897 | data_s = nghttp2_session_get_stream_user_data(session, stream_id); |
898 | if(!data_s) { |
899 | /* We could get stream ID not in the hash. For example, if we |
900 | decided to reject stream (e.g., PUSH_PROMISE). */ |
901 | return 0; |
902 | } |
903 | H2BUGF(infof(data_s, "on_stream_close(), %s (err %d), stream %u" , |
904 | nghttp2_http2_strerror(error_code), error_code, stream_id)); |
905 | stream = data_s->req.p.http; |
906 | if(!stream) |
907 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
908 | |
909 | stream->closed = TRUE; |
910 | httpc = &conn->proto.httpc; |
911 | drain_this(data_s, httpc); |
912 | Curl_expire(data_s, 0, EXPIRE_RUN_NOW); |
913 | stream->error = error_code; |
914 | |
915 | /* remove the entry from the hash as the stream is now gone */ |
916 | rv = nghttp2_session_set_stream_user_data(session, stream_id, 0); |
917 | if(rv) { |
918 | infof(data_s, "http/2: failed to clear user_data for stream %u" , |
919 | stream_id); |
920 | DEBUGASSERT(0); |
921 | } |
922 | if(stream_id == httpc->pause_stream_id) { |
923 | H2BUGF(infof(data_s, "Stopped the pause stream" )); |
924 | httpc->pause_stream_id = 0; |
925 | } |
926 | H2BUGF(infof(data_s, "Removed stream %u hash" , stream_id)); |
927 | stream->stream_id = 0; /* cleared */ |
928 | } |
929 | return 0; |
930 | } |
931 | |
932 | static int on_begin_headers(nghttp2_session *session, |
933 | const nghttp2_frame *frame, void *userp) |
934 | { |
935 | struct HTTP *stream; |
936 | struct Curl_easy *data_s = NULL; |
937 | (void)userp; |
938 | |
939 | data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); |
940 | if(!data_s) { |
941 | return 0; |
942 | } |
943 | |
944 | H2BUGF(infof(data_s, "on_begin_headers() was called" )); |
945 | |
946 | if(frame->hd.type != NGHTTP2_HEADERS) { |
947 | return 0; |
948 | } |
949 | |
950 | stream = data_s->req.p.http; |
951 | if(!stream || !stream->bodystarted) { |
952 | return 0; |
953 | } |
954 | |
955 | return 0; |
956 | } |
957 | |
958 | /* Decode HTTP status code. Returns -1 if no valid status code was |
959 | decoded. */ |
960 | static int decode_status_code(const uint8_t *value, size_t len) |
961 | { |
962 | int i; |
963 | int res; |
964 | |
965 | if(len != 3) { |
966 | return -1; |
967 | } |
968 | |
969 | res = 0; |
970 | |
971 | for(i = 0; i < 3; ++i) { |
972 | char c = value[i]; |
973 | |
974 | if(c < '0' || c > '9') { |
975 | return -1; |
976 | } |
977 | |
978 | res *= 10; |
979 | res += c - '0'; |
980 | } |
981 | |
982 | return res; |
983 | } |
984 | |
985 | /* frame->hd.type is either NGHTTP2_HEADERS or NGHTTP2_PUSH_PROMISE */ |
986 | static int on_header(nghttp2_session *session, const nghttp2_frame *frame, |
987 | const uint8_t *name, size_t namelen, |
988 | const uint8_t *value, size_t valuelen, |
989 | uint8_t flags, |
990 | void *userp) |
991 | { |
992 | struct HTTP *stream; |
993 | struct Curl_easy *data_s; |
994 | int32_t stream_id = frame->hd.stream_id; |
995 | struct connectdata *conn = (struct connectdata *)userp; |
996 | struct http_conn *httpc = &conn->proto.httpc; |
997 | CURLcode result; |
998 | (void)flags; |
999 | |
1000 | DEBUGASSERT(stream_id); /* should never be a zero stream ID here */ |
1001 | |
1002 | /* get the stream from the hash based on Stream ID */ |
1003 | data_s = nghttp2_session_get_stream_user_data(session, stream_id); |
1004 | if(!data_s) |
1005 | /* Receiving a Stream ID not in the hash should not happen, this is an |
1006 | internal error more than anything else! */ |
1007 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1008 | |
1009 | stream = data_s->req.p.http; |
1010 | if(!stream) { |
1011 | failf(data_s, "Internal NULL stream" ); |
1012 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1013 | } |
1014 | |
1015 | /* Store received PUSH_PROMISE headers to be used when the subsequent |
1016 | PUSH_PROMISE callback comes */ |
1017 | if(frame->hd.type == NGHTTP2_PUSH_PROMISE) { |
1018 | char *h; |
1019 | |
1020 | if(!strcmp(H2H3_PSEUDO_AUTHORITY, (const char *)name)) { |
1021 | /* pseudo headers are lower case */ |
1022 | int rc = 0; |
1023 | char *check = aprintf("%s:%d" , conn->host.name, conn->remote_port); |
1024 | if(!check) |
1025 | /* no memory */ |
1026 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1027 | if(!Curl_strcasecompare(check, (const char *)value) && |
1028 | ((conn->remote_port != conn->given->defport) || |
1029 | !Curl_strcasecompare(conn->host.name, (const char *)value))) { |
1030 | /* This is push is not for the same authority that was asked for in |
1031 | * the URL. RFC 7540 section 8.2 says: "A client MUST treat a |
1032 | * PUSH_PROMISE for which the server is not authoritative as a stream |
1033 | * error of type PROTOCOL_ERROR." |
1034 | */ |
1035 | (void)nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, |
1036 | stream_id, NGHTTP2_PROTOCOL_ERROR); |
1037 | rc = NGHTTP2_ERR_CALLBACK_FAILURE; |
1038 | } |
1039 | free(check); |
1040 | if(rc) |
1041 | return rc; |
1042 | } |
1043 | |
1044 | if(!stream->push_headers) { |
1045 | stream->push_headers_alloc = 10; |
1046 | stream->push_headers = malloc(stream->push_headers_alloc * |
1047 | sizeof(char *)); |
1048 | if(!stream->push_headers) |
1049 | return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; |
1050 | stream->push_headers_used = 0; |
1051 | } |
1052 | else if(stream->push_headers_used == |
1053 | stream->push_headers_alloc) { |
1054 | char **headp; |
1055 | if(stream->push_headers_alloc > 1000) { |
1056 | /* this is beyond crazy many headers, bail out */ |
1057 | failf(data_s, "Too many PUSH_PROMISE headers" ); |
1058 | Curl_safefree(stream->push_headers); |
1059 | return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; |
1060 | } |
1061 | stream->push_headers_alloc *= 2; |
1062 | headp = Curl_saferealloc(stream->push_headers, |
1063 | stream->push_headers_alloc * sizeof(char *)); |
1064 | if(!headp) { |
1065 | stream->push_headers = NULL; |
1066 | return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; |
1067 | } |
1068 | stream->push_headers = headp; |
1069 | } |
1070 | h = aprintf("%s:%s" , name, value); |
1071 | if(h) |
1072 | stream->push_headers[stream->push_headers_used++] = h; |
1073 | return 0; |
1074 | } |
1075 | |
1076 | if(stream->bodystarted) { |
1077 | /* This is a trailer */ |
1078 | H2BUGF(infof(data_s, "h2 trailer: %.*s: %.*s" , namelen, name, valuelen, |
1079 | value)); |
1080 | result = Curl_dyn_addf(&stream->trailer_recvbuf, |
1081 | "%.*s: %.*s\r\n" , namelen, name, |
1082 | valuelen, value); |
1083 | if(result) |
1084 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1085 | |
1086 | return 0; |
1087 | } |
1088 | |
1089 | if(namelen == sizeof(H2H3_PSEUDO_STATUS) - 1 && |
1090 | memcmp(H2H3_PSEUDO_STATUS, name, namelen) == 0) { |
1091 | /* nghttp2 guarantees :status is received first and only once, and |
1092 | value is 3 digits status code, and decode_status_code always |
1093 | succeeds. */ |
1094 | char buffer[32]; |
1095 | stream->status_code = decode_status_code(value, valuelen); |
1096 | DEBUGASSERT(stream->status_code != -1); |
1097 | msnprintf(buffer, sizeof(buffer), H2H3_PSEUDO_STATUS ":%u\r" , |
1098 | stream->status_code); |
1099 | result = Curl_headers_push(data_s, buffer, CURLH_PSEUDO); |
1100 | if(result) |
1101 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1102 | result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("HTTP/2 " )); |
1103 | if(result) |
1104 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1105 | result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen); |
1106 | if(result) |
1107 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1108 | /* the space character after the status code is mandatory */ |
1109 | result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST(" \r\n" )); |
1110 | if(result) |
1111 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1112 | /* if we receive data for another handle, wake that up */ |
1113 | if(get_transfer(httpc) != data_s) |
1114 | Curl_expire(data_s, 0, EXPIRE_RUN_NOW); |
1115 | |
1116 | H2BUGF(infof(data_s, "h2 status: HTTP/2 %03d (easy %p)" , |
1117 | stream->status_code, data_s)); |
1118 | return 0; |
1119 | } |
1120 | |
1121 | /* nghttp2 guarantees that namelen > 0, and :status was already |
1122 | received, and this is not pseudo-header field . */ |
1123 | /* convert to a HTTP1-style header */ |
1124 | result = Curl_dyn_addn(&stream->header_recvbuf, name, namelen); |
1125 | if(result) |
1126 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1127 | result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST(": " )); |
1128 | if(result) |
1129 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1130 | result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen); |
1131 | if(result) |
1132 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1133 | result = Curl_dyn_addn(&stream->header_recvbuf, STRCONST("\r\n" )); |
1134 | if(result) |
1135 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1136 | /* if we receive data for another handle, wake that up */ |
1137 | if(get_transfer(httpc) != data_s) |
1138 | Curl_expire(data_s, 0, EXPIRE_RUN_NOW); |
1139 | |
1140 | H2BUGF(infof(data_s, "h2 header: %.*s: %.*s" , namelen, name, valuelen, |
1141 | value)); |
1142 | |
1143 | return 0; /* 0 is successful */ |
1144 | } |
1145 | |
1146 | static ssize_t data_source_read_callback(nghttp2_session *session, |
1147 | int32_t stream_id, |
1148 | uint8_t *buf, size_t length, |
1149 | uint32_t *data_flags, |
1150 | nghttp2_data_source *source, |
1151 | void *userp) |
1152 | { |
1153 | struct Curl_easy *data_s; |
1154 | struct HTTP *stream = NULL; |
1155 | size_t nread; |
1156 | (void)source; |
1157 | (void)userp; |
1158 | |
1159 | if(stream_id) { |
1160 | /* get the stream from the hash based on Stream ID, stream ID zero is for |
1161 | connection-oriented stuff */ |
1162 | data_s = nghttp2_session_get_stream_user_data(session, stream_id); |
1163 | if(!data_s) |
1164 | /* Receiving a Stream ID not in the hash should not happen, this is an |
1165 | internal error more than anything else! */ |
1166 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1167 | |
1168 | stream = data_s->req.p.http; |
1169 | if(!stream) |
1170 | return NGHTTP2_ERR_CALLBACK_FAILURE; |
1171 | } |
1172 | else |
1173 | return NGHTTP2_ERR_INVALID_ARGUMENT; |
1174 | |
1175 | nread = CURLMIN(stream->upload_len, length); |
1176 | if(nread > 0) { |
1177 | memcpy(buf, stream->upload_mem, nread); |
1178 | stream->upload_mem += nread; |
1179 | stream->upload_len -= nread; |
1180 | if(data_s->state.infilesize != -1) |
1181 | stream->upload_left -= nread; |
1182 | } |
1183 | |
1184 | if(stream->upload_left == 0) |
1185 | *data_flags = NGHTTP2_DATA_FLAG_EOF; |
1186 | else if(nread == 0) |
1187 | return NGHTTP2_ERR_DEFERRED; |
1188 | |
1189 | H2BUGF(infof(data_s, "data_source_read_callback: " |
1190 | "returns %zu bytes stream %u" , |
1191 | nread, stream_id)); |
1192 | |
1193 | return nread; |
1194 | } |
1195 | |
1196 | #if !defined(CURL_DISABLE_VERBOSE_STRINGS) |
1197 | static int error_callback(nghttp2_session *session, |
1198 | const char *msg, |
1199 | size_t len, |
1200 | void *userp) |
1201 | { |
1202 | (void)session; |
1203 | (void)msg; |
1204 | (void)len; |
1205 | (void)userp; |
1206 | return 0; |
1207 | } |
1208 | #endif |
1209 | |
1210 | static void populate_settings(struct Curl_easy *data, |
1211 | struct http_conn *httpc) |
1212 | { |
1213 | nghttp2_settings_entry *iv = httpc->local_settings; |
1214 | |
1215 | iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS; |
1216 | iv[0].value = Curl_multi_max_concurrent_streams(data->multi); |
1217 | |
1218 | iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE; |
1219 | iv[1].value = HTTP2_HUGE_WINDOW_SIZE; |
1220 | |
1221 | iv[2].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH; |
1222 | iv[2].value = data->multi->push_cb != NULL; |
1223 | |
1224 | httpc->local_settings_num = 3; |
1225 | } |
1226 | |
1227 | void Curl_http2_done(struct Curl_easy *data, bool premature) |
1228 | { |
1229 | struct HTTP *http = data->req.p.http; |
1230 | struct http_conn *httpc = &data->conn->proto.httpc; |
1231 | |
1232 | /* there might be allocated resources done before this got the 'h2' pointer |
1233 | setup */ |
1234 | Curl_dyn_free(&http->header_recvbuf); |
1235 | Curl_dyn_free(&http->trailer_recvbuf); |
1236 | if(http->push_headers) { |
1237 | /* if they weren't used and then freed before */ |
1238 | for(; http->push_headers_used > 0; --http->push_headers_used) { |
1239 | free(http->push_headers[http->push_headers_used - 1]); |
1240 | } |
1241 | free(http->push_headers); |
1242 | http->push_headers = NULL; |
1243 | } |
1244 | |
1245 | if(!(data->conn->handler->protocol&PROTO_FAMILY_HTTP) || |
1246 | !httpc->h2) /* not HTTP/2 ? */ |
1247 | return; |
1248 | |
1249 | /* do this before the reset handling, as that might clear ->stream_id */ |
1250 | if(http->stream_id == httpc->pause_stream_id) { |
1251 | H2BUGF(infof(data, "DONE the pause stream (%u)" , http->stream_id)); |
1252 | httpc->pause_stream_id = 0; |
1253 | } |
1254 | if(premature || (!http->closed && http->stream_id)) { |
1255 | /* RST_STREAM */ |
1256 | set_transfer(httpc, data); /* set the transfer */ |
1257 | H2BUGF(infof(data, "RST stream %u" , http->stream_id)); |
1258 | if(!nghttp2_submit_rst_stream(httpc->h2, NGHTTP2_FLAG_NONE, |
1259 | http->stream_id, NGHTTP2_STREAM_CLOSED)) |
1260 | (void)nghttp2_session_send(httpc->h2); |
1261 | } |
1262 | |
1263 | if(data->state.drain) |
1264 | drained_transfer(data, httpc); |
1265 | |
1266 | /* -1 means unassigned and 0 means cleared */ |
1267 | if(http->stream_id > 0) { |
1268 | int rv = nghttp2_session_set_stream_user_data(httpc->h2, |
1269 | http->stream_id, 0); |
1270 | if(rv) { |
1271 | infof(data, "http/2: failed to clear user_data for stream %u" , |
1272 | http->stream_id); |
1273 | DEBUGASSERT(0); |
1274 | } |
1275 | set_transfer(httpc, NULL); |
1276 | http->stream_id = 0; |
1277 | } |
1278 | } |
1279 | |
1280 | /* |
1281 | * Initialize nghttp2 for a Curl connection |
1282 | */ |
1283 | static CURLcode http2_init(struct Curl_easy *data, struct connectdata *conn) |
1284 | { |
1285 | if(!conn->proto.httpc.h2) { |
1286 | int rc; |
1287 | nghttp2_session_callbacks *callbacks; |
1288 | |
1289 | conn->proto.httpc.inbuf = malloc(H2_BUFSIZE); |
1290 | if(!conn->proto.httpc.inbuf) |
1291 | return CURLE_OUT_OF_MEMORY; |
1292 | |
1293 | rc = nghttp2_session_callbacks_new(&callbacks); |
1294 | |
1295 | if(rc) { |
1296 | failf(data, "Couldn't initialize nghttp2 callbacks" ); |
1297 | return CURLE_OUT_OF_MEMORY; /* most likely at least */ |
1298 | } |
1299 | |
1300 | /* nghttp2_send_callback */ |
1301 | nghttp2_session_callbacks_set_send_callback(callbacks, send_callback); |
1302 | /* nghttp2_on_frame_recv_callback */ |
1303 | nghttp2_session_callbacks_set_on_frame_recv_callback |
1304 | (callbacks, on_frame_recv); |
1305 | /* nghttp2_on_data_chunk_recv_callback */ |
1306 | nghttp2_session_callbacks_set_on_data_chunk_recv_callback |
1307 | (callbacks, on_data_chunk_recv); |
1308 | /* nghttp2_on_stream_close_callback */ |
1309 | nghttp2_session_callbacks_set_on_stream_close_callback |
1310 | (callbacks, on_stream_close); |
1311 | /* nghttp2_on_begin_headers_callback */ |
1312 | nghttp2_session_callbacks_set_on_begin_headers_callback |
1313 | (callbacks, on_begin_headers); |
1314 | /* nghttp2_on_header_callback */ |
1315 | nghttp2_session_callbacks_set_on_header_callback(callbacks, on_header); |
1316 | |
1317 | nghttp2_session_callbacks_set_error_callback(callbacks, error_callback); |
1318 | |
1319 | /* The nghttp2 session is not yet setup, do it */ |
1320 | rc = nghttp2_session_client_new(&conn->proto.httpc.h2, callbacks, conn); |
1321 | |
1322 | nghttp2_session_callbacks_del(callbacks); |
1323 | |
1324 | if(rc) { |
1325 | failf(data, "Couldn't initialize nghttp2" ); |
1326 | return CURLE_OUT_OF_MEMORY; /* most likely at least */ |
1327 | } |
1328 | } |
1329 | return CURLE_OK; |
1330 | } |
1331 | |
1332 | /* |
1333 | * Append headers to ask for a HTTP1.1 to HTTP2 upgrade. |
1334 | */ |
1335 | CURLcode Curl_http2_request_upgrade(struct dynbuf *req, |
1336 | struct Curl_easy *data) |
1337 | { |
1338 | CURLcode result; |
1339 | ssize_t binlen; |
1340 | char *base64; |
1341 | size_t blen; |
1342 | struct connectdata *conn = data->conn; |
1343 | struct SingleRequest *k = &data->req; |
1344 | uint8_t *binsettings = conn->proto.httpc.binsettings; |
1345 | struct http_conn *httpc = &conn->proto.httpc; |
1346 | |
1347 | populate_settings(data, httpc); |
1348 | |
1349 | /* this returns number of bytes it wrote */ |
1350 | binlen = nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN, |
1351 | httpc->local_settings, |
1352 | httpc->local_settings_num); |
1353 | if(binlen <= 0) { |
1354 | failf(data, "nghttp2 unexpectedly failed on pack_settings_payload" ); |
1355 | Curl_dyn_free(req); |
1356 | return CURLE_FAILED_INIT; |
1357 | } |
1358 | conn->proto.httpc.binlen = binlen; |
1359 | |
1360 | result = Curl_base64url_encode((const char *)binsettings, binlen, |
1361 | &base64, &blen); |
1362 | if(result) { |
1363 | Curl_dyn_free(req); |
1364 | return result; |
1365 | } |
1366 | |
1367 | result = Curl_dyn_addf(req, |
1368 | "Connection: Upgrade, HTTP2-Settings\r\n" |
1369 | "Upgrade: %s\r\n" |
1370 | "HTTP2-Settings: %s\r\n" , |
1371 | NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, base64); |
1372 | free(base64); |
1373 | |
1374 | k->upgr101 = UPGR101_REQUESTED; |
1375 | |
1376 | return result; |
1377 | } |
1378 | |
1379 | /* |
1380 | * Returns nonzero if current HTTP/2 session should be closed. |
1381 | */ |
1382 | static int should_close_session(struct http_conn *httpc) |
1383 | { |
1384 | return httpc->drain_total == 0 && !nghttp2_session_want_read(httpc->h2) && |
1385 | !nghttp2_session_want_write(httpc->h2); |
1386 | } |
1387 | |
1388 | /* |
1389 | * h2_process_pending_input() processes pending input left in |
1390 | * httpc->inbuf. Then, call h2_session_send() to send pending data. |
1391 | * This function returns 0 if it succeeds, or -1 and error code will |
1392 | * be assigned to *err. |
1393 | */ |
1394 | static int h2_process_pending_input(struct Curl_easy *data, |
1395 | struct http_conn *httpc, |
1396 | CURLcode *err) |
1397 | { |
1398 | ssize_t nread; |
1399 | char *inbuf; |
1400 | ssize_t rv; |
1401 | |
1402 | nread = httpc->inbuflen - httpc->nread_inbuf; |
1403 | inbuf = httpc->inbuf + httpc->nread_inbuf; |
1404 | |
1405 | set_transfer(httpc, data); /* set the transfer */ |
1406 | rv = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)inbuf, nread); |
1407 | if(rv < 0) { |
1408 | failf(data, |
1409 | "h2_process_pending_input: nghttp2_session_mem_recv() returned " |
1410 | "%zd:%s" , rv, nghttp2_strerror((int)rv)); |
1411 | *err = CURLE_RECV_ERROR; |
1412 | return -1; |
1413 | } |
1414 | |
1415 | if(nread == rv) { |
1416 | H2BUGF(infof(data, |
1417 | "h2_process_pending_input: All data in connection buffer " |
1418 | "processed" )); |
1419 | httpc->inbuflen = 0; |
1420 | httpc->nread_inbuf = 0; |
1421 | } |
1422 | else { |
1423 | httpc->nread_inbuf += rv; |
1424 | H2BUGF(infof(data, |
1425 | "h2_process_pending_input: %zu bytes left in connection " |
1426 | "buffer" , |
1427 | httpc->inbuflen - httpc->nread_inbuf)); |
1428 | } |
1429 | |
1430 | rv = h2_session_send(data, httpc->h2); |
1431 | if(rv) { |
1432 | *err = CURLE_SEND_ERROR; |
1433 | return -1; |
1434 | } |
1435 | |
1436 | if(nghttp2_session_check_request_allowed(httpc->h2) == 0) { |
1437 | /* No more requests are allowed in the current session, so |
1438 | the connection may not be reused. This is set when a |
1439 | GOAWAY frame has been received or when the limit of stream |
1440 | identifiers has been reached. */ |
1441 | connclose(data->conn, "http/2: No new requests allowed" ); |
1442 | } |
1443 | |
1444 | if(should_close_session(httpc)) { |
1445 | struct HTTP *stream = data->req.p.http; |
1446 | H2BUGF(infof(data, |
1447 | "h2_process_pending_input: nothing to do in this session" )); |
1448 | if(stream->error) |
1449 | *err = CURLE_HTTP2; |
1450 | else { |
1451 | /* not an error per se, but should still close the connection */ |
1452 | connclose(data->conn, "GOAWAY received" ); |
1453 | *err = CURLE_OK; |
1454 | } |
1455 | return -1; |
1456 | } |
1457 | return 0; |
1458 | } |
1459 | |
1460 | /* |
1461 | * Called from transfer.c:done_sending when we stop uploading. |
1462 | */ |
1463 | CURLcode Curl_http2_done_sending(struct Curl_easy *data, |
1464 | struct connectdata *conn) |
1465 | { |
1466 | CURLcode result = CURLE_OK; |
1467 | |
1468 | if((conn->handler == &Curl_handler_http2_ssl) || |
1469 | (conn->handler == &Curl_handler_http2)) { |
1470 | /* make sure this is only attempted for HTTP/2 transfers */ |
1471 | struct HTTP *stream = data->req.p.http; |
1472 | struct http_conn *httpc = &conn->proto.httpc; |
1473 | nghttp2_session *h2 = httpc->h2; |
1474 | |
1475 | if(stream->upload_left) { |
1476 | /* If the stream still thinks there's data left to upload. */ |
1477 | |
1478 | stream->upload_left = 0; /* DONE! */ |
1479 | |
1480 | /* resume sending here to trigger the callback to get called again so |
1481 | that it can signal EOF to nghttp2 */ |
1482 | (void)nghttp2_session_resume_data(h2, stream->stream_id); |
1483 | (void)h2_process_pending_input(data, httpc, &result); |
1484 | } |
1485 | |
1486 | /* If nghttp2 still has pending frames unsent */ |
1487 | if(nghttp2_session_want_write(h2)) { |
1488 | struct SingleRequest *k = &data->req; |
1489 | int rv; |
1490 | |
1491 | H2BUGF(infof(data, "HTTP/2 still wants to send data (easy %p)" , data)); |
1492 | |
1493 | /* and attempt to send the pending frames */ |
1494 | rv = h2_session_send(data, h2); |
1495 | if(rv) |
1496 | result = CURLE_SEND_ERROR; |
1497 | |
1498 | if(nghttp2_session_want_write(h2)) { |
1499 | /* re-set KEEP_SEND to make sure we are called again */ |
1500 | k->keepon |= KEEP_SEND; |
1501 | } |
1502 | } |
1503 | } |
1504 | return result; |
1505 | } |
1506 | |
1507 | static ssize_t http2_handle_stream_close(struct connectdata *conn, |
1508 | struct Curl_easy *data, |
1509 | struct HTTP *stream, CURLcode *err) |
1510 | { |
1511 | struct http_conn *httpc = &conn->proto.httpc; |
1512 | |
1513 | if(httpc->pause_stream_id == stream->stream_id) { |
1514 | httpc->pause_stream_id = 0; |
1515 | } |
1516 | |
1517 | drained_transfer(data, httpc); |
1518 | |
1519 | if(httpc->pause_stream_id == 0) { |
1520 | if(h2_process_pending_input(data, httpc, err) != 0) { |
1521 | return -1; |
1522 | } |
1523 | } |
1524 | |
1525 | DEBUGASSERT(data->state.drain == 0); |
1526 | |
1527 | /* Reset to FALSE to prevent infinite loop in readwrite_data function. */ |
1528 | stream->closed = FALSE; |
1529 | if(stream->error == NGHTTP2_REFUSED_STREAM) { |
1530 | H2BUGF(infof(data, "REFUSED_STREAM (%u), try again on a new connection" , |
1531 | stream->stream_id)); |
1532 | connclose(conn, "REFUSED_STREAM" ); /* don't use this anymore */ |
1533 | data->state.refused_stream = TRUE; |
1534 | *err = CURLE_RECV_ERROR; /* trigger Curl_retry_request() later */ |
1535 | return -1; |
1536 | } |
1537 | else if(stream->error != NGHTTP2_NO_ERROR) { |
1538 | failf(data, "HTTP/2 stream %u was not closed cleanly: %s (err %u)" , |
1539 | stream->stream_id, nghttp2_http2_strerror(stream->error), |
1540 | stream->error); |
1541 | *err = CURLE_HTTP2_STREAM; |
1542 | return -1; |
1543 | } |
1544 | |
1545 | if(!stream->bodystarted) { |
1546 | failf(data, "HTTP/2 stream %u was closed cleanly, but before getting " |
1547 | " all response header fields, treated as error" , |
1548 | stream->stream_id); |
1549 | *err = CURLE_HTTP2_STREAM; |
1550 | return -1; |
1551 | } |
1552 | |
1553 | if(Curl_dyn_len(&stream->trailer_recvbuf)) { |
1554 | char *trailp = Curl_dyn_ptr(&stream->trailer_recvbuf); |
1555 | char *lf; |
1556 | |
1557 | do { |
1558 | size_t len = 0; |
1559 | CURLcode result; |
1560 | /* each trailer line ends with a newline */ |
1561 | lf = strchr(trailp, '\n'); |
1562 | if(!lf) |
1563 | break; |
1564 | len = lf + 1 - trailp; |
1565 | |
1566 | Curl_debug(data, CURLINFO_HEADER_IN, trailp, len); |
1567 | /* pass the trailers one by one to the callback */ |
1568 | result = Curl_client_write(data, CLIENTWRITE_HEADER, trailp, len); |
1569 | if(result) { |
1570 | *err = result; |
1571 | return -1; |
1572 | } |
1573 | trailp = ++lf; |
1574 | } while(lf); |
1575 | } |
1576 | |
1577 | stream->close_handled = TRUE; |
1578 | |
1579 | H2BUGF(infof(data, "http2_recv returns 0, http2_handle_stream_close" )); |
1580 | return 0; |
1581 | } |
1582 | |
1583 | /* |
1584 | * h2_pri_spec() fills in the pri_spec struct, used by nghttp2 to send weight |
1585 | * and dependency to the peer. It also stores the updated values in the state |
1586 | * struct. |
1587 | */ |
1588 | |
1589 | static void h2_pri_spec(struct Curl_easy *data, |
1590 | nghttp2_priority_spec *pri_spec) |
1591 | { |
1592 | struct HTTP *depstream = (data->set.stream_depends_on? |
1593 | data->set.stream_depends_on->req.p.http:NULL); |
1594 | int32_t depstream_id = depstream? depstream->stream_id:0; |
1595 | nghttp2_priority_spec_init(pri_spec, depstream_id, data->set.stream_weight, |
1596 | data->set.stream_depends_e); |
1597 | data->state.stream_weight = data->set.stream_weight; |
1598 | data->state.stream_depends_e = data->set.stream_depends_e; |
1599 | data->state.stream_depends_on = data->set.stream_depends_on; |
1600 | } |
1601 | |
1602 | /* |
1603 | * h2_session_send() checks if there's been an update in the priority / |
1604 | * dependency settings and if so it submits a PRIORITY frame with the updated |
1605 | * info. |
1606 | */ |
1607 | static int h2_session_send(struct Curl_easy *data, |
1608 | nghttp2_session *h2) |
1609 | { |
1610 | struct HTTP *stream = data->req.p.http; |
1611 | struct http_conn *httpc = &data->conn->proto.httpc; |
1612 | set_transfer(httpc, data); |
1613 | if((data->set.stream_weight != data->state.stream_weight) || |
1614 | (data->set.stream_depends_e != data->state.stream_depends_e) || |
1615 | (data->set.stream_depends_on != data->state.stream_depends_on) ) { |
1616 | /* send new weight and/or dependency */ |
1617 | nghttp2_priority_spec pri_spec; |
1618 | int rv; |
1619 | |
1620 | h2_pri_spec(data, &pri_spec); |
1621 | |
1622 | H2BUGF(infof(data, "Queuing PRIORITY on stream %u (easy %p)" , |
1623 | stream->stream_id, data)); |
1624 | DEBUGASSERT(stream->stream_id != -1); |
1625 | rv = nghttp2_submit_priority(h2, NGHTTP2_FLAG_NONE, stream->stream_id, |
1626 | &pri_spec); |
1627 | if(rv) |
1628 | return rv; |
1629 | } |
1630 | |
1631 | return nghttp2_session_send(h2); |
1632 | } |
1633 | |
1634 | static ssize_t http2_recv(struct Curl_easy *data, int sockindex, |
1635 | char *mem, size_t len, CURLcode *err) |
1636 | { |
1637 | ssize_t nread; |
1638 | struct connectdata *conn = data->conn; |
1639 | struct http_conn *httpc = &conn->proto.httpc; |
1640 | struct HTTP *stream = data->req.p.http; |
1641 | |
1642 | (void)sockindex; /* we always do HTTP2 on sockindex 0 */ |
1643 | |
1644 | if(should_close_session(httpc)) { |
1645 | H2BUGF(infof(data, |
1646 | "http2_recv: nothing to do in this session" )); |
1647 | if(conn->bits.close) { |
1648 | /* already marked for closure, return OK and we're done */ |
1649 | *err = CURLE_OK; |
1650 | return 0; |
1651 | } |
1652 | *err = CURLE_HTTP2; |
1653 | return -1; |
1654 | } |
1655 | |
1656 | /* Nullify here because we call nghttp2_session_send() and they |
1657 | might refer to the old buffer. */ |
1658 | stream->upload_mem = NULL; |
1659 | stream->upload_len = 0; |
1660 | |
1661 | /* |
1662 | * At this point 'stream' is just in the Curl_easy the connection |
1663 | * identifies as its owner at this time. |
1664 | */ |
1665 | |
1666 | if(stream->bodystarted && |
1667 | stream->nread_header_recvbuf < Curl_dyn_len(&stream->header_recvbuf)) { |
1668 | /* If there is header data pending for this stream to return, do that */ |
1669 | size_t left = |
1670 | Curl_dyn_len(&stream->header_recvbuf) - stream->nread_header_recvbuf; |
1671 | size_t ncopy = CURLMIN(len, left); |
1672 | memcpy(mem, Curl_dyn_ptr(&stream->header_recvbuf) + |
1673 | stream->nread_header_recvbuf, ncopy); |
1674 | stream->nread_header_recvbuf += ncopy; |
1675 | |
1676 | H2BUGF(infof(data, "http2_recv: Got %d bytes from header_recvbuf" , |
1677 | (int)ncopy)); |
1678 | return ncopy; |
1679 | } |
1680 | |
1681 | H2BUGF(infof(data, "http2_recv: easy %p (stream %u) win %u/%u" , |
1682 | data, stream->stream_id, |
1683 | nghttp2_session_get_local_window_size(httpc->h2), |
1684 | nghttp2_session_get_stream_local_window_size(httpc->h2, |
1685 | stream->stream_id) |
1686 | )); |
1687 | |
1688 | if((data->state.drain) && stream->memlen) { |
1689 | H2BUGF(infof(data, "http2_recv: DRAIN %zu bytes stream %u (%p => %p)" , |
1690 | stream->memlen, stream->stream_id, |
1691 | stream->mem, mem)); |
1692 | if(mem != stream->mem) { |
1693 | /* if we didn't get the same buffer this time, we must move the data to |
1694 | the beginning */ |
1695 | memmove(mem, stream->mem, stream->memlen); |
1696 | stream->len = len - stream->memlen; |
1697 | stream->mem = mem; |
1698 | } |
1699 | if(httpc->pause_stream_id == stream->stream_id && !stream->pausedata) { |
1700 | /* We have paused nghttp2, but we have no pause data (see |
1701 | on_data_chunk_recv). */ |
1702 | httpc->pause_stream_id = 0; |
1703 | if(h2_process_pending_input(data, httpc, err) != 0) { |
1704 | return -1; |
1705 | } |
1706 | } |
1707 | } |
1708 | else if(stream->pausedata) { |
1709 | DEBUGASSERT(httpc->pause_stream_id == stream->stream_id); |
1710 | nread = CURLMIN(len, stream->pauselen); |
1711 | memcpy(mem, stream->pausedata, nread); |
1712 | |
1713 | stream->pausedata += nread; |
1714 | stream->pauselen -= nread; |
1715 | |
1716 | if(stream->pauselen == 0) { |
1717 | H2BUGF(infof(data, "Unpaused by stream %u" , stream->stream_id)); |
1718 | DEBUGASSERT(httpc->pause_stream_id == stream->stream_id); |
1719 | httpc->pause_stream_id = 0; |
1720 | |
1721 | stream->pausedata = NULL; |
1722 | stream->pauselen = 0; |
1723 | |
1724 | /* When NGHTTP2_ERR_PAUSE is returned from |
1725 | data_source_read_callback, we might not process DATA frame |
1726 | fully. Calling nghttp2_session_mem_recv() again will |
1727 | continue to process DATA frame, but if there is no incoming |
1728 | frames, then we have to call it again with 0-length data. |
1729 | Without this, on_stream_close callback will not be called, |
1730 | and stream could be hanged. */ |
1731 | if(h2_process_pending_input(data, httpc, err) != 0) { |
1732 | return -1; |
1733 | } |
1734 | } |
1735 | H2BUGF(infof(data, "http2_recv: returns unpaused %zd bytes on stream %u" , |
1736 | nread, stream->stream_id)); |
1737 | return nread; |
1738 | } |
1739 | else if(httpc->pause_stream_id) { |
1740 | /* If a stream paused nghttp2_session_mem_recv previously, and has |
1741 | not processed all data, it still refers to the buffer in |
1742 | nghttp2_session. If we call nghttp2_session_mem_recv(), we may |
1743 | overwrite that buffer. To avoid that situation, just return |
1744 | here with CURLE_AGAIN. This could be busy loop since data in |
1745 | socket is not read. But it seems that usually streams are |
1746 | notified with its drain property, and socket is read again |
1747 | quickly. */ |
1748 | if(stream->closed) |
1749 | /* closed overrides paused */ |
1750 | return 0; |
1751 | H2BUGF(infof(data, "stream %u is paused, pause id: %u" , |
1752 | stream->stream_id, httpc->pause_stream_id)); |
1753 | *err = CURLE_AGAIN; |
1754 | return -1; |
1755 | } |
1756 | else { |
1757 | /* remember where to store incoming data for this stream and how big the |
1758 | buffer is */ |
1759 | stream->mem = mem; |
1760 | stream->len = len; |
1761 | stream->memlen = 0; |
1762 | |
1763 | if(httpc->inbuflen == 0) { |
1764 | nread = ((Curl_recv *)httpc->recv_underlying)( |
1765 | data, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, err); |
1766 | |
1767 | if(nread == -1) { |
1768 | if(*err != CURLE_AGAIN) |
1769 | failf(data, "Failed receiving HTTP2 data" ); |
1770 | else if(stream->closed) |
1771 | /* received when the stream was already closed! */ |
1772 | return http2_handle_stream_close(conn, data, stream, err); |
1773 | |
1774 | return -1; |
1775 | } |
1776 | |
1777 | if(nread == 0) { |
1778 | if(!stream->closed) { |
1779 | /* This will happen when the server or proxy server is SIGKILLed |
1780 | during data transfer. We should emit an error since our data |
1781 | received may be incomplete. */ |
1782 | failf(data, "HTTP/2 stream %u was not closed cleanly before" |
1783 | " end of the underlying stream" , |
1784 | stream->stream_id); |
1785 | *err = CURLE_HTTP2_STREAM; |
1786 | return -1; |
1787 | } |
1788 | |
1789 | H2BUGF(infof(data, "end of stream" )); |
1790 | *err = CURLE_OK; |
1791 | return 0; |
1792 | } |
1793 | |
1794 | H2BUGF(infof(data, "nread=%zd" , nread)); |
1795 | |
1796 | httpc->inbuflen = nread; |
1797 | |
1798 | DEBUGASSERT(httpc->nread_inbuf == 0); |
1799 | } |
1800 | else { |
1801 | nread = httpc->inbuflen - httpc->nread_inbuf; |
1802 | (void)nread; /* silence warning, used in debug */ |
1803 | H2BUGF(infof(data, "Use data left in connection buffer, nread=%zd" , |
1804 | nread)); |
1805 | } |
1806 | |
1807 | if(h2_process_pending_input(data, httpc, err)) |
1808 | return -1; |
1809 | } |
1810 | if(stream->memlen) { |
1811 | ssize_t retlen = stream->memlen; |
1812 | H2BUGF(infof(data, "http2_recv: returns %zd for stream %u" , |
1813 | retlen, stream->stream_id)); |
1814 | stream->memlen = 0; |
1815 | |
1816 | if(httpc->pause_stream_id == stream->stream_id) { |
1817 | /* data for this stream is returned now, but this stream caused a pause |
1818 | already so we need it called again asap */ |
1819 | H2BUGF(infof(data, "Data returned for PAUSED stream %u" , |
1820 | stream->stream_id)); |
1821 | } |
1822 | else if(!stream->closed) { |
1823 | drained_transfer(data, httpc); |
1824 | } |
1825 | else |
1826 | /* this stream is closed, trigger a another read ASAP to detect that */ |
1827 | Curl_expire(data, 0, EXPIRE_RUN_NOW); |
1828 | |
1829 | return retlen; |
1830 | } |
1831 | if(stream->closed) |
1832 | return http2_handle_stream_close(conn, data, stream, err); |
1833 | *err = CURLE_AGAIN; |
1834 | H2BUGF(infof(data, "http2_recv returns AGAIN for stream %u" , |
1835 | stream->stream_id)); |
1836 | return -1; |
1837 | } |
1838 | |
1839 | static ssize_t http2_send(struct Curl_easy *data, int sockindex, |
1840 | const void *mem, size_t len, CURLcode *err) |
1841 | { |
1842 | /* |
1843 | * Currently, we send request in this function, but this function is also |
1844 | * used to send request body. It would be nice to add dedicated function for |
1845 | * request. |
1846 | */ |
1847 | int rv; |
1848 | struct connectdata *conn = data->conn; |
1849 | struct http_conn *httpc = &conn->proto.httpc; |
1850 | struct HTTP *stream = data->req.p.http; |
1851 | nghttp2_nv *nva = NULL; |
1852 | size_t nheader; |
1853 | nghttp2_data_provider data_prd; |
1854 | int32_t stream_id; |
1855 | nghttp2_session *h2 = httpc->h2; |
1856 | nghttp2_priority_spec pri_spec; |
1857 | CURLcode result; |
1858 | struct h2h3req *hreq; |
1859 | |
1860 | (void)sockindex; |
1861 | |
1862 | H2BUGF(infof(data, "http2_send len=%zu" , len)); |
1863 | |
1864 | if(stream->stream_id != -1) { |
1865 | if(stream->close_handled) { |
1866 | infof(data, "stream %u closed" , stream->stream_id); |
1867 | *err = CURLE_HTTP2_STREAM; |
1868 | return -1; |
1869 | } |
1870 | else if(stream->closed) { |
1871 | return http2_handle_stream_close(conn, data, stream, err); |
1872 | } |
1873 | /* If stream_id != -1, we have dispatched request HEADERS, and now |
1874 | are going to send or sending request body in DATA frame */ |
1875 | stream->upload_mem = mem; |
1876 | stream->upload_len = len; |
1877 | rv = nghttp2_session_resume_data(h2, stream->stream_id); |
1878 | if(nghttp2_is_fatal(rv)) { |
1879 | *err = CURLE_SEND_ERROR; |
1880 | return -1; |
1881 | } |
1882 | rv = h2_session_send(data, h2); |
1883 | if(nghttp2_is_fatal(rv)) { |
1884 | *err = CURLE_SEND_ERROR; |
1885 | return -1; |
1886 | } |
1887 | len -= stream->upload_len; |
1888 | |
1889 | /* Nullify here because we call nghttp2_session_send() and they |
1890 | might refer to the old buffer. */ |
1891 | stream->upload_mem = NULL; |
1892 | stream->upload_len = 0; |
1893 | |
1894 | if(should_close_session(httpc)) { |
1895 | H2BUGF(infof(data, "http2_send: nothing to do in this session" )); |
1896 | *err = CURLE_HTTP2; |
1897 | return -1; |
1898 | } |
1899 | |
1900 | if(stream->upload_left) { |
1901 | /* we are sure that we have more data to send here. Calling the |
1902 | following API will make nghttp2_session_want_write() return |
1903 | nonzero if remote window allows it, which then libcurl checks |
1904 | socket is writable or not. See http2_perform_getsock(). */ |
1905 | nghttp2_session_resume_data(h2, stream->stream_id); |
1906 | } |
1907 | |
1908 | #ifdef DEBUG_HTTP2 |
1909 | if(!len) { |
1910 | infof(data, "http2_send: easy %p (stream %u) win %u/%u" , |
1911 | data, stream->stream_id, |
1912 | nghttp2_session_get_remote_window_size(httpc->h2), |
1913 | nghttp2_session_get_stream_remote_window_size(httpc->h2, |
1914 | stream->stream_id) |
1915 | ); |
1916 | |
1917 | } |
1918 | infof(data, "http2_send returns %zu for stream %u" , len, |
1919 | stream->stream_id); |
1920 | #endif |
1921 | return len; |
1922 | } |
1923 | |
1924 | result = Curl_pseudo_headers(data, mem, len, &hreq); |
1925 | if(result) { |
1926 | *err = result; |
1927 | return -1; |
1928 | } |
1929 | nheader = hreq->entries; |
1930 | |
1931 | nva = malloc(sizeof(nghttp2_nv) * nheader); |
1932 | if(!nva) { |
1933 | Curl_pseudo_free(hreq); |
1934 | *err = CURLE_OUT_OF_MEMORY; |
1935 | return -1; |
1936 | } |
1937 | else { |
1938 | unsigned int i; |
1939 | for(i = 0; i < nheader; i++) { |
1940 | nva[i].name = (unsigned char *)hreq->header[i].name; |
1941 | nva[i].namelen = hreq->header[i].namelen; |
1942 | nva[i].value = (unsigned char *)hreq->header[i].value; |
1943 | nva[i].valuelen = hreq->header[i].valuelen; |
1944 | nva[i].flags = NGHTTP2_NV_FLAG_NONE; |
1945 | } |
1946 | Curl_pseudo_free(hreq); |
1947 | } |
1948 | |
1949 | h2_pri_spec(data, &pri_spec); |
1950 | |
1951 | H2BUGF(infof(data, "http2_send request allowed %d (easy handle %p)" , |
1952 | nghttp2_session_check_request_allowed(h2), (void *)data)); |
1953 | |
1954 | switch(data->state.httpreq) { |
1955 | case HTTPREQ_POST: |
1956 | case HTTPREQ_POST_FORM: |
1957 | case HTTPREQ_POST_MIME: |
1958 | case HTTPREQ_PUT: |
1959 | if(data->state.infilesize != -1) |
1960 | stream->upload_left = data->state.infilesize; |
1961 | else |
1962 | /* data sending without specifying the data amount up front */ |
1963 | stream->upload_left = -1; /* unknown, but not zero */ |
1964 | |
1965 | data_prd.read_callback = data_source_read_callback; |
1966 | data_prd.source.ptr = NULL; |
1967 | stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader, |
1968 | &data_prd, data); |
1969 | break; |
1970 | default: |
1971 | stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader, |
1972 | NULL, data); |
1973 | } |
1974 | |
1975 | Curl_safefree(nva); |
1976 | |
1977 | if(stream_id < 0) { |
1978 | H2BUGF(infof(data, |
1979 | "http2_send() nghttp2_submit_request error (%s)%u" , |
1980 | nghttp2_strerror(stream_id), stream_id)); |
1981 | *err = CURLE_SEND_ERROR; |
1982 | return -1; |
1983 | } |
1984 | |
1985 | infof(data, "Using Stream ID: %u (easy handle %p)" , |
1986 | stream_id, (void *)data); |
1987 | stream->stream_id = stream_id; |
1988 | |
1989 | rv = h2_session_send(data, h2); |
1990 | if(rv) { |
1991 | H2BUGF(infof(data, |
1992 | "http2_send() nghttp2_session_send error (%s)%d" , |
1993 | nghttp2_strerror(rv), rv)); |
1994 | |
1995 | *err = CURLE_SEND_ERROR; |
1996 | return -1; |
1997 | } |
1998 | |
1999 | if(should_close_session(httpc)) { |
2000 | H2BUGF(infof(data, "http2_send: nothing to do in this session" )); |
2001 | *err = CURLE_HTTP2; |
2002 | return -1; |
2003 | } |
2004 | |
2005 | /* If whole HEADERS frame was sent off to the underlying socket, the nghttp2 |
2006 | library calls data_source_read_callback. But only it found that no data |
2007 | available, so it deferred the DATA transmission. Which means that |
2008 | nghttp2_session_want_write() returns 0 on http2_perform_getsock(), which |
2009 | results that no writable socket check is performed. To workaround this, |
2010 | we issue nghttp2_session_resume_data() here to bring back DATA |
2011 | transmission from deferred state. */ |
2012 | nghttp2_session_resume_data(h2, stream->stream_id); |
2013 | |
2014 | return len; |
2015 | } |
2016 | |
2017 | CURLcode Curl_http2_setup(struct Curl_easy *data, |
2018 | struct connectdata *conn) |
2019 | { |
2020 | CURLcode result; |
2021 | struct http_conn *httpc = &conn->proto.httpc; |
2022 | struct HTTP *stream = data->req.p.http; |
2023 | |
2024 | DEBUGASSERT(data->state.buffer); |
2025 | |
2026 | stream->stream_id = -1; |
2027 | |
2028 | Curl_dyn_init(&stream->header_recvbuf, DYN_H2_HEADERS); |
2029 | Curl_dyn_init(&stream->trailer_recvbuf, DYN_H2_TRAILERS); |
2030 | |
2031 | stream->upload_left = 0; |
2032 | stream->upload_mem = NULL; |
2033 | stream->upload_len = 0; |
2034 | stream->mem = data->state.buffer; |
2035 | stream->len = data->set.buffer_size; |
2036 | |
2037 | multi_connchanged(data->multi); |
2038 | /* below this point only connection related inits are done, which only needs |
2039 | to be done once per connection */ |
2040 | |
2041 | if((conn->handler == &Curl_handler_http2_ssl) || |
2042 | (conn->handler == &Curl_handler_http2)) |
2043 | return CURLE_OK; /* already done */ |
2044 | |
2045 | if(conn->handler->flags & PROTOPT_SSL) |
2046 | conn->handler = &Curl_handler_http2_ssl; |
2047 | else |
2048 | conn->handler = &Curl_handler_http2; |
2049 | |
2050 | result = http2_init(data, conn); |
2051 | if(result) { |
2052 | Curl_dyn_free(&stream->header_recvbuf); |
2053 | return result; |
2054 | } |
2055 | |
2056 | infof(data, "Using HTTP2, server supports multiplexing" ); |
2057 | |
2058 | conn->bits.multiplex = TRUE; /* at least potentially multiplexed */ |
2059 | conn->httpversion = 20; |
2060 | conn->bundle->multiuse = BUNDLE_MULTIPLEX; |
2061 | |
2062 | httpc->inbuflen = 0; |
2063 | httpc->nread_inbuf = 0; |
2064 | |
2065 | httpc->pause_stream_id = 0; |
2066 | httpc->drain_total = 0; |
2067 | |
2068 | return CURLE_OK; |
2069 | } |
2070 | |
2071 | CURLcode Curl_http2_switched(struct Curl_easy *data, |
2072 | const char *mem, size_t nread) |
2073 | { |
2074 | CURLcode result; |
2075 | struct connectdata *conn = data->conn; |
2076 | struct http_conn *httpc = &conn->proto.httpc; |
2077 | int rv; |
2078 | struct HTTP *stream = data->req.p.http; |
2079 | |
2080 | result = Curl_http2_setup(data, conn); |
2081 | if(result) |
2082 | return result; |
2083 | |
2084 | httpc->recv_underlying = conn->recv[FIRSTSOCKET]; |
2085 | httpc->send_underlying = conn->send[FIRSTSOCKET]; |
2086 | conn->recv[FIRSTSOCKET] = http2_recv; |
2087 | conn->send[FIRSTSOCKET] = http2_send; |
2088 | |
2089 | if(data->req.upgr101 == UPGR101_RECEIVED) { |
2090 | /* stream 1 is opened implicitly on upgrade */ |
2091 | stream->stream_id = 1; |
2092 | /* queue SETTINGS frame (again) */ |
2093 | rv = nghttp2_session_upgrade2(httpc->h2, httpc->binsettings, httpc->binlen, |
2094 | data->state.httpreq == HTTPREQ_HEAD, NULL); |
2095 | if(rv) { |
2096 | failf(data, "nghttp2_session_upgrade2() failed: %s(%d)" , |
2097 | nghttp2_strerror(rv), rv); |
2098 | return CURLE_HTTP2; |
2099 | } |
2100 | |
2101 | rv = nghttp2_session_set_stream_user_data(httpc->h2, |
2102 | stream->stream_id, |
2103 | data); |
2104 | if(rv) { |
2105 | infof(data, "http/2: failed to set user_data for stream %u" , |
2106 | stream->stream_id); |
2107 | DEBUGASSERT(0); |
2108 | } |
2109 | } |
2110 | else { |
2111 | populate_settings(data, httpc); |
2112 | |
2113 | /* stream ID is unknown at this point */ |
2114 | stream->stream_id = -1; |
2115 | rv = nghttp2_submit_settings(httpc->h2, NGHTTP2_FLAG_NONE, |
2116 | httpc->local_settings, |
2117 | httpc->local_settings_num); |
2118 | if(rv) { |
2119 | failf(data, "nghttp2_submit_settings() failed: %s(%d)" , |
2120 | nghttp2_strerror(rv), rv); |
2121 | return CURLE_HTTP2; |
2122 | } |
2123 | } |
2124 | |
2125 | rv = nghttp2_session_set_local_window_size(httpc->h2, NGHTTP2_FLAG_NONE, 0, |
2126 | HTTP2_HUGE_WINDOW_SIZE); |
2127 | if(rv) { |
2128 | failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)" , |
2129 | nghttp2_strerror(rv), rv); |
2130 | return CURLE_HTTP2; |
2131 | } |
2132 | |
2133 | /* we are going to copy mem to httpc->inbuf. This is required since |
2134 | mem is part of buffer pointed by stream->mem, and callbacks |
2135 | called by nghttp2_session_mem_recv() will write stream specific |
2136 | data into stream->mem, overwriting data already there. */ |
2137 | if(H2_BUFSIZE < nread) { |
2138 | failf(data, "connection buffer size is too small to store data following " |
2139 | "HTTP Upgrade response header: buflen=%d, datalen=%zu" , |
2140 | H2_BUFSIZE, nread); |
2141 | return CURLE_HTTP2; |
2142 | } |
2143 | |
2144 | infof(data, "Copying HTTP/2 data in stream buffer to connection buffer" |
2145 | " after upgrade: len=%zu" , |
2146 | nread); |
2147 | |
2148 | if(nread) |
2149 | memcpy(httpc->inbuf, mem, nread); |
2150 | |
2151 | httpc->inbuflen = nread; |
2152 | |
2153 | DEBUGASSERT(httpc->nread_inbuf == 0); |
2154 | |
2155 | if(-1 == h2_process_pending_input(data, httpc, &result)) |
2156 | return CURLE_HTTP2; |
2157 | |
2158 | return CURLE_OK; |
2159 | } |
2160 | |
2161 | CURLcode Curl_http2_stream_pause(struct Curl_easy *data, bool pause) |
2162 | { |
2163 | DEBUGASSERT(data); |
2164 | DEBUGASSERT(data->conn); |
2165 | /* if it isn't HTTP/2, we're done */ |
2166 | if(!(data->conn->handler->protocol & PROTO_FAMILY_HTTP) || |
2167 | !data->conn->proto.httpc.h2) |
2168 | return CURLE_OK; |
2169 | #ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE |
2170 | else { |
2171 | struct HTTP *stream = data->req.p.http; |
2172 | struct http_conn *httpc = &data->conn->proto.httpc; |
2173 | uint32_t window = !pause * HTTP2_HUGE_WINDOW_SIZE; |
2174 | int rv = nghttp2_session_set_local_window_size(httpc->h2, |
2175 | NGHTTP2_FLAG_NONE, |
2176 | stream->stream_id, |
2177 | window); |
2178 | if(rv) { |
2179 | failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)" , |
2180 | nghttp2_strerror(rv), rv); |
2181 | return CURLE_HTTP2; |
2182 | } |
2183 | |
2184 | /* make sure the window update gets sent */ |
2185 | rv = h2_session_send(data, httpc->h2); |
2186 | if(rv) |
2187 | return CURLE_SEND_ERROR; |
2188 | |
2189 | DEBUGF(infof(data, "Set HTTP/2 window size to %u for stream %u" , |
2190 | window, stream->stream_id)); |
2191 | |
2192 | #ifdef DEBUGBUILD |
2193 | { |
2194 | /* read out the stream local window again */ |
2195 | uint32_t window2 = |
2196 | nghttp2_session_get_stream_local_window_size(httpc->h2, |
2197 | stream->stream_id); |
2198 | DEBUGF(infof(data, "HTTP/2 window size is now %u for stream %u" , |
2199 | window2, stream->stream_id)); |
2200 | } |
2201 | #endif |
2202 | } |
2203 | #endif |
2204 | return CURLE_OK; |
2205 | } |
2206 | |
2207 | CURLcode Curl_http2_add_child(struct Curl_easy *parent, |
2208 | struct Curl_easy *child, |
2209 | bool exclusive) |
2210 | { |
2211 | if(parent) { |
2212 | struct Curl_http2_dep **tail; |
2213 | struct Curl_http2_dep *dep = calloc(1, sizeof(struct Curl_http2_dep)); |
2214 | if(!dep) |
2215 | return CURLE_OUT_OF_MEMORY; |
2216 | dep->data = child; |
2217 | |
2218 | if(parent->set.stream_dependents && exclusive) { |
2219 | struct Curl_http2_dep *node = parent->set.stream_dependents; |
2220 | while(node) { |
2221 | node->data->set.stream_depends_on = child; |
2222 | node = node->next; |
2223 | } |
2224 | |
2225 | tail = &child->set.stream_dependents; |
2226 | while(*tail) |
2227 | tail = &(*tail)->next; |
2228 | |
2229 | DEBUGASSERT(!*tail); |
2230 | *tail = parent->set.stream_dependents; |
2231 | parent->set.stream_dependents = 0; |
2232 | } |
2233 | |
2234 | tail = &parent->set.stream_dependents; |
2235 | while(*tail) { |
2236 | (*tail)->data->set.stream_depends_e = FALSE; |
2237 | tail = &(*tail)->next; |
2238 | } |
2239 | |
2240 | DEBUGASSERT(!*tail); |
2241 | *tail = dep; |
2242 | } |
2243 | |
2244 | child->set.stream_depends_on = parent; |
2245 | child->set.stream_depends_e = exclusive; |
2246 | return CURLE_OK; |
2247 | } |
2248 | |
2249 | void Curl_http2_remove_child(struct Curl_easy *parent, struct Curl_easy *child) |
2250 | { |
2251 | struct Curl_http2_dep *last = 0; |
2252 | struct Curl_http2_dep *data = parent->set.stream_dependents; |
2253 | DEBUGASSERT(child->set.stream_depends_on == parent); |
2254 | |
2255 | while(data && data->data != child) { |
2256 | last = data; |
2257 | data = data->next; |
2258 | } |
2259 | |
2260 | DEBUGASSERT(data); |
2261 | |
2262 | if(data) { |
2263 | if(last) { |
2264 | last->next = data->next; |
2265 | } |
2266 | else { |
2267 | parent->set.stream_dependents = data->next; |
2268 | } |
2269 | free(data); |
2270 | } |
2271 | |
2272 | child->set.stream_depends_on = 0; |
2273 | child->set.stream_depends_e = FALSE; |
2274 | } |
2275 | |
2276 | void Curl_http2_cleanup_dependencies(struct Curl_easy *data) |
2277 | { |
2278 | while(data->set.stream_dependents) { |
2279 | struct Curl_easy *tmp = data->set.stream_dependents->data; |
2280 | Curl_http2_remove_child(data, tmp); |
2281 | if(data->set.stream_depends_on) |
2282 | Curl_http2_add_child(data->set.stream_depends_on, tmp, FALSE); |
2283 | } |
2284 | |
2285 | if(data->set.stream_depends_on) |
2286 | Curl_http2_remove_child(data->set.stream_depends_on, data); |
2287 | } |
2288 | |
2289 | /* Only call this function for a transfer that already got a HTTP/2 |
2290 | CURLE_HTTP2_STREAM error! */ |
2291 | bool Curl_h2_http_1_1_error(struct Curl_easy *data) |
2292 | { |
2293 | struct HTTP *stream = data->req.p.http; |
2294 | return (stream->error == NGHTTP2_HTTP_1_1_REQUIRED); |
2295 | } |
2296 | |
2297 | #else /* !USE_NGHTTP2 */ |
2298 | |
2299 | /* Satisfy external references even if http2 is not compiled in. */ |
2300 | #include <curl/curl.h> |
2301 | |
2302 | char *(struct curl_pushheaders *h, size_t num) |
2303 | { |
2304 | (void) h; |
2305 | (void) num; |
2306 | return NULL; |
2307 | } |
2308 | |
2309 | char *(struct curl_pushheaders *h, const char *) |
2310 | { |
2311 | (void) h; |
2312 | (void) header; |
2313 | return NULL; |
2314 | } |
2315 | |
2316 | #endif /* USE_NGHTTP2 */ |
2317 | |