1: /***************************************************************************
2: * _ _ ____ _
3: * Project ___| | | | _ \| |
4: * / __| | | | |_) | |
5: * | (__| |_| | _ <| |___
6: * \___|\___/|_| \_\_____|
7: *
8: * Copyright (C) 1998 - 2020, Daniel Stenberg, <daniel@haxx.se>, 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.haxx.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: ***************************************************************************/
22:
23: #include "curl_setup.h"
24:
25: #ifdef USE_NGHTTP2
26: #include <nghttp2/nghttp2.h>
27: #include "urldata.h"
28: #include "http2.h"
29: #include "http.h"
30: #include "sendf.h"
31: #include "select.h"
32: #include "curl_base64.h"
33: #include "strcase.h"
34: #include "multiif.h"
35: #include "url.h"
36: #include "connect.h"
37: #include "strtoofft.h"
38: #include "strdup.h"
39: /* The last 3 #include files should be in this order */
40: #include "curl_printf.h"
41: #include "curl_memory.h"
42: #include "memdebug.h"
43:
44: #define H2_BUFSIZE 32768
45:
46: #if (NGHTTP2_VERSION_NUM < 0x010c00)
47: #error too old nghttp2 version, upgrade!
48: #endif
49:
50: #ifdef CURL_DISABLE_VERBOSE_STRINGS
51: #define nghttp2_session_callbacks_set_error_callback(x,y)
52: #endif
53:
54: #if (NGHTTP2_VERSION_NUM >= 0x010c00)
55: #define NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE 1
56: #endif
57:
58: #define HTTP2_HUGE_WINDOW_SIZE (32 * 1024 * 1024) /* 32 MB */
59:
60: #ifdef DEBUG_HTTP2
61: #define H2BUGF(x) x
62: #else
63: #define H2BUGF(x) do { } while(0)
64: #endif
65:
66:
67: static ssize_t http2_recv(struct connectdata *conn, int sockindex,
68: char *mem, size_t len, CURLcode *err);
69: static bool http2_connisdead(struct connectdata *conn);
70: static int h2_session_send(struct Curl_easy *data,
71: nghttp2_session *h2);
72: static int h2_process_pending_input(struct connectdata *conn,
73: struct http_conn *httpc,
74: CURLcode *err);
75:
76: /*
77: * Curl_http2_init_state() is called when the easy handle is created and
78: * allows for HTTP/2 specific init of state.
79: */
80: void Curl_http2_init_state(struct UrlState *state)
81: {
82: state->stream_weight = NGHTTP2_DEFAULT_WEIGHT;
83: }
84:
85: /*
86: * Curl_http2_init_userset() is called when the easy handle is created and
87: * allows for HTTP/2 specific user-set fields.
88: */
89: void Curl_http2_init_userset(struct UserDefined *set)
90: {
91: set->stream_weight = NGHTTP2_DEFAULT_WEIGHT;
92: }
93:
94: static int http2_perform_getsock(const struct connectdata *conn,
95: curl_socket_t *sock)
96: {
97: const struct http_conn *c = &conn->proto.httpc;
98: struct SingleRequest *k = &conn->data->req;
99: int bitmap = GETSOCK_BLANK;
100:
101: sock[0] = conn->sock[FIRSTSOCKET];
102:
103: /* in a HTTP/2 connection we can basically always get a frame so we should
104: always be ready for one */
105: bitmap |= GETSOCK_READSOCK(FIRSTSOCKET);
106:
107: /* we're still uploading or the HTTP/2 layer wants to send data */
108: if(((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND) ||
109: nghttp2_session_want_write(c->h2))
110: bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET);
111:
112: return bitmap;
113: }
114:
115: static int http2_getsock(struct connectdata *conn,
116: curl_socket_t *socks)
117: {
118: return http2_perform_getsock(conn, socks);
119: }
120:
121: /*
122: * http2_stream_free() free HTTP2 stream related data
123: */
124: static void http2_stream_free(struct HTTP *http)
125: {
126: if(http) {
127: Curl_add_buffer_free(&http->header_recvbuf);
128: Curl_add_buffer_free(&http->trailer_recvbuf);
129: for(; http->push_headers_used > 0; --http->push_headers_used) {
130: free(http->push_headers[http->push_headers_used - 1]);
131: }
132: free(http->push_headers);
133: http->push_headers = NULL;
134: }
135: }
136:
137: /*
138: * Disconnects *a* connection used for HTTP/2. It might be an old one from the
139: * connection cache and not the "main" one. Don't touch the easy handle!
140: */
141:
142: static CURLcode http2_disconnect(struct connectdata *conn,
143: bool dead_connection)
144: {
145: struct http_conn *c = &conn->proto.httpc;
146: (void)dead_connection;
147:
148: H2BUGF(infof(conn->data, "HTTP/2 DISCONNECT starts now\n"));
149:
150: nghttp2_session_del(c->h2);
151: Curl_safefree(c->inbuf);
152:
153: H2BUGF(infof(conn->data, "HTTP/2 DISCONNECT done\n"));
154:
155: return CURLE_OK;
156: }
157:
158: /*
159: * The server may send us data at any point (e.g. PING frames). Therefore,
160: * we cannot assume that an HTTP/2 socket is dead just because it is readable.
161: *
162: * Instead, if it is readable, run Curl_connalive() to peek at the socket
163: * and distinguish between closed and data.
164: */
165: static bool http2_connisdead(struct connectdata *conn)
166: {
167: int sval;
168: bool dead = TRUE;
169:
170: if(conn->bits.close)
171: return TRUE;
172:
173: sval = SOCKET_READABLE(conn->sock[FIRSTSOCKET], 0);
174: if(sval == 0) {
175: /* timeout */
176: dead = FALSE;
177: }
178: else if(sval & CURL_CSELECT_ERR) {
179: /* socket is in an error state */
180: dead = TRUE;
181: }
182: else if(sval & CURL_CSELECT_IN) {
183: /* readable with no error. could still be closed */
184: dead = !Curl_connalive(conn);
185: if(!dead) {
186: /* This happens before we've sent off a request and the connection is
187: not in use by any other transfer, there shouldn't be any data here,
188: only "protocol frames" */
189: CURLcode result;
190: struct http_conn *httpc = &conn->proto.httpc;
191: ssize_t nread = -1;
192: if(httpc->recv_underlying)
193: /* if called "too early", this pointer isn't setup yet! */
194: nread = ((Curl_recv *)httpc->recv_underlying)(
195: conn, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result);
196: if(nread != -1) {
197: infof(conn->data,
198: "%d bytes stray data read before trying h2 connection\n",
199: (int)nread);
200: httpc->nread_inbuf = 0;
201: httpc->inbuflen = nread;
202: (void)h2_process_pending_input(conn, httpc, &result);
203: }
204: else
205: /* the read failed so let's say this is dead anyway */
206: dead = TRUE;
207: }
208: }
209:
210: return dead;
211: }
212:
213: static unsigned int http2_conncheck(struct connectdata *check,
214: unsigned int checks_to_perform)
215: {
216: unsigned int ret_val = CONNRESULT_NONE;
217: struct http_conn *c = &check->proto.httpc;
218: int rc;
219: bool send_frames = false;
220:
221: if(checks_to_perform & CONNCHECK_ISDEAD) {
222: if(http2_connisdead(check))
223: ret_val |= CONNRESULT_DEAD;
224: }
225:
226: if(checks_to_perform & CONNCHECK_KEEPALIVE) {
227: struct curltime now = Curl_now();
228: timediff_t elapsed = Curl_timediff(now, check->keepalive);
229:
230: if(elapsed > check->upkeep_interval_ms) {
231: /* Perform an HTTP/2 PING */
232: rc = nghttp2_submit_ping(c->h2, 0, ZERO_NULL);
233: if(!rc) {
234: /* Successfully added a PING frame to the session. Need to flag this
235: so the frame is sent. */
236: send_frames = true;
237: }
238: else {
239: failf(check->data, "nghttp2_submit_ping() failed: %s(%d)",
240: nghttp2_strerror(rc), rc);
241: }
242:
243: check->keepalive = now;
244: }
245: }
246:
247: if(send_frames) {
248: rc = nghttp2_session_send(c->h2);
249: if(rc)
250: failf(check->data, "nghttp2_session_send() failed: %s(%d)",
251: nghttp2_strerror(rc), rc);
252: }
253:
254: return ret_val;
255: }
256:
257: /* called from http_setup_conn */
258: void Curl_http2_setup_req(struct Curl_easy *data)
259: {
260: struct HTTP *http = data->req.protop;
261:
262: http->nread_header_recvbuf = 0;
263: http->bodystarted = FALSE;
264: http->status_code = -1;
265: http->pausedata = NULL;
266: http->pauselen = 0;
267: http->closed = FALSE;
268: http->close_handled = FALSE;
269: http->mem = data->state.buffer;
270: http->len = data->set.buffer_size;
271: http->memlen = 0;
272: }
273:
274: /* called from http_setup_conn */
275: void Curl_http2_setup_conn(struct connectdata *conn)
276: {
277: conn->proto.httpc.settings.max_concurrent_streams =
278: DEFAULT_MAX_CONCURRENT_STREAMS;
279: conn->proto.httpc.error_code = NGHTTP2_NO_ERROR;
280: }
281:
282: /*
283: * HTTP2 handler interface. This isn't added to the general list of protocols
284: * but will be used at run-time when the protocol is dynamically switched from
285: * HTTP to HTTP2.
286: */
287: static const struct Curl_handler Curl_handler_http2 = {
288: "HTTP", /* scheme */
289: ZERO_NULL, /* setup_connection */
290: Curl_http, /* do_it */
291: Curl_http_done, /* done */
292: ZERO_NULL, /* do_more */
293: ZERO_NULL, /* connect_it */
294: ZERO_NULL, /* connecting */
295: ZERO_NULL, /* doing */
296: http2_getsock, /* proto_getsock */
297: http2_getsock, /* doing_getsock */
298: ZERO_NULL, /* domore_getsock */
299: http2_perform_getsock, /* perform_getsock */
300: http2_disconnect, /* disconnect */
301: ZERO_NULL, /* readwrite */
302: http2_conncheck, /* connection_check */
303: PORT_HTTP, /* defport */
304: CURLPROTO_HTTP, /* protocol */
305: PROTOPT_STREAM /* flags */
306: };
307:
308: static const struct Curl_handler Curl_handler_http2_ssl = {
309: "HTTPS", /* scheme */
310: ZERO_NULL, /* setup_connection */
311: Curl_http, /* do_it */
312: Curl_http_done, /* done */
313: ZERO_NULL, /* do_more */
314: ZERO_NULL, /* connect_it */
315: ZERO_NULL, /* connecting */
316: ZERO_NULL, /* doing */
317: http2_getsock, /* proto_getsock */
318: http2_getsock, /* doing_getsock */
319: ZERO_NULL, /* domore_getsock */
320: http2_perform_getsock, /* perform_getsock */
321: http2_disconnect, /* disconnect */
322: ZERO_NULL, /* readwrite */
323: http2_conncheck, /* connection_check */
324: PORT_HTTP, /* defport */
325: CURLPROTO_HTTPS, /* protocol */
326: PROTOPT_SSL | PROTOPT_STREAM /* flags */
327: };
328:
329: /*
330: * Store nghttp2 version info in this buffer, Prefix with a space. Return
331: * total length written.
332: */
333: int Curl_http2_ver(char *p, size_t len)
334: {
335: nghttp2_info *h2 = nghttp2_version(0);
336: return msnprintf(p, len, "nghttp2/%s", h2->version_str);
337: }
338:
339: /*
340: * The implementation of nghttp2_send_callback type. Here we write |data| with
341: * size |length| to the network and return the number of bytes actually
342: * written. See the documentation of nghttp2_send_callback for the details.
343: */
344: static ssize_t send_callback(nghttp2_session *h2,
345: const uint8_t *data, size_t length, int flags,
346: void *userp)
347: {
348: struct connectdata *conn = (struct connectdata *)userp;
349: struct http_conn *c = &conn->proto.httpc;
350: ssize_t written;
351: CURLcode result = CURLE_OK;
352:
353: (void)h2;
354: (void)flags;
355:
356: if(!c->send_underlying)
357: /* called before setup properly! */
358: return NGHTTP2_ERR_CALLBACK_FAILURE;
359:
360: written = ((Curl_send*)c->send_underlying)(conn, FIRSTSOCKET,
361: data, length, &result);
362:
363: if(result == CURLE_AGAIN) {
364: return NGHTTP2_ERR_WOULDBLOCK;
365: }
366:
367: if(written == -1) {
368: failf(conn->data, "Failed sending HTTP2 data");
369: return NGHTTP2_ERR_CALLBACK_FAILURE;
370: }
371:
372: if(!written)
373: return NGHTTP2_ERR_WOULDBLOCK;
374:
375: return written;
376: }
377:
378:
379: /* We pass a pointer to this struct in the push callback, but the contents of
380: the struct are hidden from the user. */
381: struct curl_pushheaders {
382: struct Curl_easy *data;
383: const nghttp2_push_promise *frame;
384: };
385:
386: /*
387: * push header access function. Only to be used from within the push callback
388: */
389: char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num)
390: {
391: /* Verify that we got a good easy handle in the push header struct, mostly to
392: detect rubbish input fast(er). */
393: if(!h || !GOOD_EASY_HANDLE(h->data))
394: return NULL;
395: else {
396: struct HTTP *stream = h->data->req.protop;
397: if(num < stream->push_headers_used)
398: return stream->push_headers[num];
399: }
400: return NULL;
401: }
402:
403: /*
404: * push header access function. Only to be used from within the push callback
405: */
406: char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header)
407: {
408: /* Verify that we got a good easy handle in the push header struct,
409: mostly to detect rubbish input fast(er). Also empty header name
410: is just a rubbish too. We have to allow ":" at the beginning of
411: the header, but header == ":" must be rejected. If we have ':' in
412: the middle of header, it could be matched in middle of the value,
413: this is because we do prefix match.*/
414: if(!h || !GOOD_EASY_HANDLE(h->data) || !header || !header[0] ||
415: !strcmp(header, ":") || strchr(header + 1, ':'))
416: return NULL;
417: else {
418: struct HTTP *stream = h->data->req.protop;
419: size_t len = strlen(header);
420: size_t i;
421: for(i = 0; i<stream->push_headers_used; i++) {
422: if(!strncmp(header, stream->push_headers[i], len)) {
423: /* sub-match, make sure that it is followed by a colon */
424: if(stream->push_headers[i][len] != ':')
425: continue;
426: return &stream->push_headers[i][len + 1];
427: }
428: }
429: }
430: return NULL;
431: }
432:
433: /*
434: * This specific transfer on this connection has been "drained".
435: */
436: static void drained_transfer(struct Curl_easy *data,
437: struct http_conn *httpc)
438: {
439: DEBUGASSERT(httpc->drain_total >= data->state.drain);
440: httpc->drain_total -= data->state.drain;
441: data->state.drain = 0;
442: }
443:
444: /*
445: * Mark this transfer to get "drained".
446: */
447: static void drain_this(struct Curl_easy *data,
448: struct http_conn *httpc)
449: {
450: data->state.drain++;
451: httpc->drain_total++;
452: DEBUGASSERT(httpc->drain_total >= data->state.drain);
453: }
454:
455: static struct Curl_easy *duphandle(struct Curl_easy *data)
456: {
457: struct Curl_easy *second = curl_easy_duphandle(data);
458: if(second) {
459: /* setup the request struct */
460: struct HTTP *http = calloc(1, sizeof(struct HTTP));
461: if(!http) {
462: (void)Curl_close(&second);
463: }
464: else {
465: second->req.protop = http;
466: http->header_recvbuf = Curl_add_buffer_init();
467: if(!http->header_recvbuf) {
468: free(http);
469: (void)Curl_close(&second);
470: }
471: else {
472: Curl_http2_setup_req(second);
473: second->state.stream_weight = data->state.stream_weight;
474: }
475: }
476: }
477: return second;
478: }
479:
480:
481: static int push_promise(struct Curl_easy *data,
482: struct connectdata *conn,
483: const nghttp2_push_promise *frame)
484: {
485: int rv;
486: H2BUGF(infof(data, "PUSH_PROMISE received, stream %u!\n",
487: frame->promised_stream_id));
488: if(data->multi->push_cb) {
489: struct HTTP *stream;
490: struct HTTP *newstream;
491: struct curl_pushheaders heads;
492: CURLMcode rc;
493: struct http_conn *httpc;
494: size_t i;
495: /* clone the parent */
496: struct Curl_easy *newhandle = duphandle(data);
497: if(!newhandle) {
498: infof(data, "failed to duplicate handle\n");
499: rv = 1; /* FAIL HARD */
500: goto fail;
501: }
502:
503: heads.data = data;
504: heads.frame = frame;
505: /* ask the application */
506: H2BUGF(infof(data, "Got PUSH_PROMISE, ask application!\n"));
507:
508: stream = data->req.protop;
509: if(!stream) {
510: failf(data, "Internal NULL stream!\n");
511: (void)Curl_close(&newhandle);
512: rv = 1;
513: goto fail;
514: }
515:
516: Curl_set_in_callback(data, true);
517: rv = data->multi->push_cb(data, newhandle,
518: stream->push_headers_used, &heads,
519: data->multi->push_userp);
520: Curl_set_in_callback(data, false);
521:
522: /* free the headers again */
523: for(i = 0; i<stream->push_headers_used; i++)
524: free(stream->push_headers[i]);
525: free(stream->push_headers);
526: stream->push_headers = NULL;
527: stream->push_headers_used = 0;
528:
529: if(rv) {
530: /* denied, kill off the new handle again */
531: http2_stream_free(newhandle->req.protop);
532: newhandle->req.protop = NULL;
533: (void)Curl_close(&newhandle);
534: goto fail;
535: }
536:
537: newstream = newhandle->req.protop;
538: newstream->stream_id = frame->promised_stream_id;
539: newhandle->req.maxdownload = -1;
540: newhandle->req.size = -1;
541:
542: /* approved, add to the multi handle and immediately switch to PERFORM
543: state with the given connection !*/
544: rc = Curl_multi_add_perform(data->multi, newhandle, conn);
545: if(rc) {
546: infof(data, "failed to add handle to multi\n");
547: http2_stream_free(newhandle->req.protop);
548: newhandle->req.protop = NULL;
549: Curl_close(&newhandle);
550: rv = 1;
551: goto fail;
552: }
553:
554: httpc = &conn->proto.httpc;
555: rv = nghttp2_session_set_stream_user_data(httpc->h2,
556: frame->promised_stream_id,
557: newhandle);
558: if(rv) {
559: infof(data, "failed to set user_data for stream %d\n",
560: frame->promised_stream_id);
561: DEBUGASSERT(0);
562: goto fail;
563: }
564: }
565: else {
566: H2BUGF(infof(data, "Got PUSH_PROMISE, ignore it!\n"));
567: rv = 1;
568: }
569: fail:
570: return rv;
571: }
572:
573: /*
574: * multi_connchanged() is called to tell that there is a connection in
575: * this multi handle that has changed state (multiplexing become possible, the
576: * number of allowed streams changed or similar), and a subsequent use of this
577: * multi handle should move CONNECT_PEND handles back to CONNECT to have them
578: * retry.
579: */
580: static void multi_connchanged(struct Curl_multi *multi)
581: {
582: multi->recheckstate = TRUE;
583: }
584:
585: static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame,
586: void *userp)
587: {
588: struct connectdata *conn = (struct connectdata *)userp;
589: struct http_conn *httpc = &conn->proto.httpc;
590: struct Curl_easy *data_s = NULL;
591: struct HTTP *stream = NULL;
592: int rv;
593: size_t left, ncopy;
594: int32_t stream_id = frame->hd.stream_id;
595: CURLcode result;
596:
597: if(!stream_id) {
598: /* stream ID zero is for connection-oriented stuff */
599: if(frame->hd.type == NGHTTP2_SETTINGS) {
600: uint32_t max_conn = httpc->settings.max_concurrent_streams;
601: H2BUGF(infof(conn->data, "Got SETTINGS\n"));
602: httpc->settings.max_concurrent_streams =
603: nghttp2_session_get_remote_settings(
604: session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS);
605: httpc->settings.enable_push =
606: nghttp2_session_get_remote_settings(
607: session, NGHTTP2_SETTINGS_ENABLE_PUSH);
608: H2BUGF(infof(conn->data, "MAX_CONCURRENT_STREAMS == %d\n",
609: httpc->settings.max_concurrent_streams));
610: H2BUGF(infof(conn->data, "ENABLE_PUSH == %s\n",
611: httpc->settings.enable_push?"TRUE":"false"));
612: if(max_conn != httpc->settings.max_concurrent_streams) {
613: /* only signal change if the value actually changed */
614: infof(conn->data,
615: "Connection state changed (MAX_CONCURRENT_STREAMS == %u)!\n",
616: httpc->settings.max_concurrent_streams);
617: multi_connchanged(conn->data->multi);
618: }
619: }
620: return 0;
621: }
622: data_s = nghttp2_session_get_stream_user_data(session, stream_id);
623: if(!data_s) {
624: H2BUGF(infof(conn->data,
625: "No Curl_easy associated with stream: %x\n",
626: stream_id));
627: return 0;
628: }
629:
630: stream = data_s->req.protop;
631: if(!stream) {
632: H2BUGF(infof(data_s, "No proto pointer for stream: %x\n",
633: stream_id));
634: return NGHTTP2_ERR_CALLBACK_FAILURE;
635: }
636:
637: H2BUGF(infof(data_s, "on_frame_recv() header %x stream %x\n",
638: frame->hd.type, stream_id));
639:
640: switch(frame->hd.type) {
641: case NGHTTP2_DATA:
642: /* If body started on this stream, then receiving DATA is illegal. */
643: if(!stream->bodystarted) {
644: rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
645: stream_id, NGHTTP2_PROTOCOL_ERROR);
646:
647: if(nghttp2_is_fatal(rv)) {
648: return NGHTTP2_ERR_CALLBACK_FAILURE;
649: }
650: }
651: break;
652: case NGHTTP2_HEADERS:
653: if(stream->bodystarted) {
654: /* Only valid HEADERS after body started is trailer HEADERS. We
655: buffer them in on_header callback. */
656: break;
657: }
658:
659: /* nghttp2 guarantees that :status is received, and we store it to
660: stream->status_code. Fuzzing has proven this can still be reached
661: without status code having been set. */
662: if(stream->status_code == -1)
663: return NGHTTP2_ERR_CALLBACK_FAILURE;
664:
665: /* Only final status code signals the end of header */
666: if(stream->status_code / 100 != 1) {
667: stream->bodystarted = TRUE;
668: stream->status_code = -1;
669: }
670:
671: result = Curl_add_buffer(&stream->header_recvbuf, "\r\n", 2);
672: if(result)
673: return NGHTTP2_ERR_CALLBACK_FAILURE;
674:
675: left = stream->header_recvbuf->size_used - stream->nread_header_recvbuf;
676: ncopy = CURLMIN(stream->len, left);
677:
678: memcpy(&stream->mem[stream->memlen],
679: stream->header_recvbuf->buffer + stream->nread_header_recvbuf,
680: ncopy);
681: stream->nread_header_recvbuf += ncopy;
682:
683: H2BUGF(infof(data_s, "Store %zu bytes headers from stream %u at %p\n",
684: ncopy, stream_id, stream->mem));
685:
686: stream->len -= ncopy;
687: stream->memlen += ncopy;
688:
689: drain_this(data_s, httpc);
690: {
691: /* get the pointer from userp again since it was re-assigned above */
692: struct connectdata *conn_s = (struct connectdata *)userp;
693:
694: /* if we receive data for another handle, wake that up */
695: if(conn_s->data != data_s)
696: Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
697: }
698: break;
699: case NGHTTP2_PUSH_PROMISE:
700: rv = push_promise(data_s, conn, &frame->push_promise);
701: if(rv) { /* deny! */
702: rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
703: frame->push_promise.promised_stream_id,
704: NGHTTP2_CANCEL);
705: if(nghttp2_is_fatal(rv)) {
706: return rv;
707: }
708: }
709: break;
710: default:
711: H2BUGF(infof(data_s, "Got frame type %x for stream %u!\n",
712: frame->hd.type, stream_id));
713: break;
714: }
715: return 0;
716: }
717:
718: static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
719: int32_t stream_id,
720: const uint8_t *data, size_t len, void *userp)
721: {
722: struct HTTP *stream;
723: struct Curl_easy *data_s;
724: size_t nread;
725: struct connectdata *conn = (struct connectdata *)userp;
726: (void)session;
727: (void)flags;
728: (void)data;
729:
730: DEBUGASSERT(stream_id); /* should never be a zero stream ID here */
731:
732: /* get the stream from the hash based on Stream ID */
733: data_s = nghttp2_session_get_stream_user_data(session, stream_id);
734: if(!data_s)
735: /* Receiving a Stream ID not in the hash should not happen, this is an
736: internal error more than anything else! */
737: return NGHTTP2_ERR_CALLBACK_FAILURE;
738:
739: stream = data_s->req.protop;
740: if(!stream)
741: return NGHTTP2_ERR_CALLBACK_FAILURE;
742:
743: nread = CURLMIN(stream->len, len);
744: memcpy(&stream->mem[stream->memlen], data, nread);
745:
746: stream->len -= nread;
747: stream->memlen += nread;
748:
749: drain_this(data_s, &conn->proto.httpc);
750:
751: /* if we receive data for another handle, wake that up */
752: if(conn->data != data_s)
753: Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
754:
755: H2BUGF(infof(data_s, "%zu data received for stream %u "
756: "(%zu left in buffer %p, total %zu)\n",
757: nread, stream_id,
758: stream->len, stream->mem,
759: stream->memlen));
760:
761: if(nread < len) {
762: stream->pausedata = data + nread;
763: stream->pauselen = len - nread;
764: H2BUGF(infof(data_s, "NGHTTP2_ERR_PAUSE - %zu bytes out of buffer"
765: ", stream %u\n",
766: len - nread, stream_id));
767: data_s->conn->proto.httpc.pause_stream_id = stream_id;
768:
769: return NGHTTP2_ERR_PAUSE;
770: }
771:
772: /* pause execution of nghttp2 if we received data for another handle
773: in order to process them first. */
774: if(conn->data != data_s) {
775: data_s->conn->proto.httpc.pause_stream_id = stream_id;
776:
777: return NGHTTP2_ERR_PAUSE;
778: }
779:
780: return 0;
781: }
782:
783: static int on_stream_close(nghttp2_session *session, int32_t stream_id,
784: uint32_t error_code, void *userp)
785: {
786: struct Curl_easy *data_s;
787: struct HTTP *stream;
788: struct connectdata *conn = (struct connectdata *)userp;
789: int rv;
790: (void)session;
791: (void)stream_id;
792:
793: if(stream_id) {
794: struct http_conn *httpc;
795: /* get the stream from the hash based on Stream ID, stream ID zero is for
796: connection-oriented stuff */
797: data_s = nghttp2_session_get_stream_user_data(session, stream_id);
798: if(!data_s) {
799: /* We could get stream ID not in the hash. For example, if we
800: decided to reject stream (e.g., PUSH_PROMISE). */
801: return 0;
802: }
803: H2BUGF(infof(data_s, "on_stream_close(), %s (err %d), stream %u\n",
804: nghttp2_strerror(error_code), error_code, stream_id));
805: stream = data_s->req.protop;
806: if(!stream)
807: return NGHTTP2_ERR_CALLBACK_FAILURE;
808:
809: stream->closed = TRUE;
810: httpc = &conn->proto.httpc;
811: drain_this(data_s, httpc);
812: Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
813: httpc->error_code = error_code;
814:
815: /* remove the entry from the hash as the stream is now gone */
816: rv = nghttp2_session_set_stream_user_data(session, stream_id, 0);
817: if(rv) {
818: infof(data_s, "http/2: failed to clear user_data for stream %d!\n",
819: stream_id);
820: DEBUGASSERT(0);
821: }
822: if(stream_id == httpc->pause_stream_id) {
823: H2BUGF(infof(data_s, "Stopped the pause stream!\n"));
824: httpc->pause_stream_id = 0;
825: }
826: H2BUGF(infof(data_s, "Removed stream %u hash!\n", stream_id));
827: stream->stream_id = 0; /* cleared */
828: }
829: return 0;
830: }
831:
832: static int on_begin_headers(nghttp2_session *session,
833: const nghttp2_frame *frame, void *userp)
834: {
835: struct HTTP *stream;
836: struct Curl_easy *data_s = NULL;
837: (void)userp;
838:
839: data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
840: if(!data_s) {
841: return 0;
842: }
843:
844: H2BUGF(infof(data_s, "on_begin_headers() was called\n"));
845:
846: if(frame->hd.type != NGHTTP2_HEADERS) {
847: return 0;
848: }
849:
850: stream = data_s->req.protop;
851: if(!stream || !stream->bodystarted) {
852: return 0;
853: }
854:
855: if(!stream->trailer_recvbuf) {
856: stream->trailer_recvbuf = Curl_add_buffer_init();
857: if(!stream->trailer_recvbuf) {
858: return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
859: }
860: }
861: return 0;
862: }
863:
864: /* Decode HTTP status code. Returns -1 if no valid status code was
865: decoded. */
866: static int decode_status_code(const uint8_t *value, size_t len)
867: {
868: int i;
869: int res;
870:
871: if(len != 3) {
872: return -1;
873: }
874:
875: res = 0;
876:
877: for(i = 0; i < 3; ++i) {
878: char c = value[i];
879:
880: if(c < '0' || c > '9') {
881: return -1;
882: }
883:
884: res *= 10;
885: res += c - '0';
886: }
887:
888: return res;
889: }
890:
891: /* frame->hd.type is either NGHTTP2_HEADERS or NGHTTP2_PUSH_PROMISE */
892: static int on_header(nghttp2_session *session, const nghttp2_frame *frame,
893: const uint8_t *name, size_t namelen,
894: const uint8_t *value, size_t valuelen,
895: uint8_t flags,
896: void *userp)
897: {
898: struct HTTP *stream;
899: struct Curl_easy *data_s;
900: int32_t stream_id = frame->hd.stream_id;
901: struct connectdata *conn = (struct connectdata *)userp;
902: CURLcode result;
903: (void)flags;
904:
905: DEBUGASSERT(stream_id); /* should never be a zero stream ID here */
906:
907: /* get the stream from the hash based on Stream ID */
908: data_s = nghttp2_session_get_stream_user_data(session, stream_id);
909: if(!data_s)
910: /* Receiving a Stream ID not in the hash should not happen, this is an
911: internal error more than anything else! */
912: return NGHTTP2_ERR_CALLBACK_FAILURE;
913:
914: stream = data_s->req.protop;
915: if(!stream) {
916: failf(data_s, "Internal NULL stream! 5\n");
917: return NGHTTP2_ERR_CALLBACK_FAILURE;
918: }
919:
920: /* Store received PUSH_PROMISE headers to be used when the subsequent
921: PUSH_PROMISE callback comes */
922: if(frame->hd.type == NGHTTP2_PUSH_PROMISE) {
923: char *h;
924:
925: if(!strcmp(":authority", (const char *)name)) {
926: /* pseudo headers are lower case */
927: int rc = 0;
928: char *check = aprintf("%s:%d", conn->host.name, conn->remote_port);
929: if(!check)
930: /* no memory */
931: return NGHTTP2_ERR_CALLBACK_FAILURE;
932: if(!Curl_strcasecompare(check, (const char *)value) &&
933: ((conn->remote_port != conn->given->defport) ||
934: !Curl_strcasecompare(conn->host.name, (const char *)value))) {
935: /* This is push is not for the same authority that was asked for in
936: * the URL. RFC 7540 section 8.2 says: "A client MUST treat a
937: * PUSH_PROMISE for which the server is not authoritative as a stream
938: * error of type PROTOCOL_ERROR."
939: */
940: (void)nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE,
941: stream_id, NGHTTP2_PROTOCOL_ERROR);
942: rc = NGHTTP2_ERR_CALLBACK_FAILURE;
943: }
944: free(check);
945: if(rc)
946: return rc;
947: }
948:
949: if(!stream->push_headers) {
950: stream->push_headers_alloc = 10;
951: stream->push_headers = malloc(stream->push_headers_alloc *
952: sizeof(char *));
953: if(!stream->push_headers)
954: return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
955: stream->push_headers_used = 0;
956: }
957: else if(stream->push_headers_used ==
958: stream->push_headers_alloc) {
959: char **headp;
960: stream->push_headers_alloc *= 2;
961: headp = Curl_saferealloc(stream->push_headers,
962: stream->push_headers_alloc * sizeof(char *));
963: if(!headp) {
964: stream->push_headers = NULL;
965: return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE;
966: }
967: stream->push_headers = headp;
968: }
969: h = aprintf("%s:%s", name, value);
970: if(h)
971: stream->push_headers[stream->push_headers_used++] = h;
972: return 0;
973: }
974:
975: if(stream->bodystarted) {
976: /* This is trailer fields. */
977: /* 4 is for ": " and "\r\n". */
978: uint32_t n = (uint32_t)(namelen + valuelen + 4);
979:
980: H2BUGF(infof(data_s, "h2 trailer: %.*s: %.*s\n", namelen, name, valuelen,
981: value));
982:
983: result = Curl_add_buffer(&stream->trailer_recvbuf, &n, sizeof(n));
984: if(result)
985: return NGHTTP2_ERR_CALLBACK_FAILURE;
986: result = Curl_add_buffer(&stream->trailer_recvbuf, name, namelen);
987: if(result)
988: return NGHTTP2_ERR_CALLBACK_FAILURE;
989: result = Curl_add_buffer(&stream->trailer_recvbuf, ": ", 2);
990: if(result)
991: return NGHTTP2_ERR_CALLBACK_FAILURE;
992: result = Curl_add_buffer(&stream->trailer_recvbuf, value, valuelen);
993: if(result)
994: return NGHTTP2_ERR_CALLBACK_FAILURE;
995: result = Curl_add_buffer(&stream->trailer_recvbuf, "\r\n\0", 3);
996: if(result)
997: return NGHTTP2_ERR_CALLBACK_FAILURE;
998:
999: return 0;
1000: }
1001:
1002: if(namelen == sizeof(":status") - 1 &&
1003: memcmp(":status", name, namelen) == 0) {
1004: /* nghttp2 guarantees :status is received first and only once, and
1005: value is 3 digits status code, and decode_status_code always
1006: succeeds. */
1007: stream->status_code = decode_status_code(value, valuelen);
1008: DEBUGASSERT(stream->status_code != -1);
1009:
1010: result = Curl_add_buffer(&stream->header_recvbuf, "HTTP/2 ", 7);
1011: if(result)
1012: return NGHTTP2_ERR_CALLBACK_FAILURE;
1013: result = Curl_add_buffer(&stream->header_recvbuf, value, valuelen);
1014: if(result)
1015: return NGHTTP2_ERR_CALLBACK_FAILURE;
1016: /* the space character after the status code is mandatory */
1017: result = Curl_add_buffer(&stream->header_recvbuf, " \r\n", 3);
1018: if(result)
1019: return NGHTTP2_ERR_CALLBACK_FAILURE;
1020: /* if we receive data for another handle, wake that up */
1021: if(conn->data != data_s)
1022: Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
1023:
1024: H2BUGF(infof(data_s, "h2 status: HTTP/2 %03d (easy %p)\n",
1025: stream->status_code, data_s));
1026: return 0;
1027: }
1028:
1029: /* nghttp2 guarantees that namelen > 0, and :status was already
1030: received, and this is not pseudo-header field . */
1031: /* convert to a HTTP1-style header */
1032: result = Curl_add_buffer(&stream->header_recvbuf, name, namelen);
1033: if(result)
1034: return NGHTTP2_ERR_CALLBACK_FAILURE;
1035: result = Curl_add_buffer(&stream->header_recvbuf, ": ", 2);
1036: if(result)
1037: return NGHTTP2_ERR_CALLBACK_FAILURE;
1038: result = Curl_add_buffer(&stream->header_recvbuf, value, valuelen);
1039: if(result)
1040: return NGHTTP2_ERR_CALLBACK_FAILURE;
1041: result = Curl_add_buffer(&stream->header_recvbuf, "\r\n", 2);
1042: if(result)
1043: return NGHTTP2_ERR_CALLBACK_FAILURE;
1044: /* if we receive data for another handle, wake that up */
1045: if(conn->data != data_s)
1046: Curl_expire(data_s, 0, EXPIRE_RUN_NOW);
1047:
1048: H2BUGF(infof(data_s, "h2 header: %.*s: %.*s\n", namelen, name, valuelen,
1049: value));
1050:
1051: return 0; /* 0 is successful */
1052: }
1053:
1054: static ssize_t data_source_read_callback(nghttp2_session *session,
1055: int32_t stream_id,
1056: uint8_t *buf, size_t length,
1057: uint32_t *data_flags,
1058: nghttp2_data_source *source,
1059: void *userp)
1060: {
1061: struct Curl_easy *data_s;
1062: struct HTTP *stream = NULL;
1063: size_t nread;
1064: (void)source;
1065: (void)userp;
1066:
1067: if(stream_id) {
1068: /* get the stream from the hash based on Stream ID, stream ID zero is for
1069: connection-oriented stuff */
1070: data_s = nghttp2_session_get_stream_user_data(session, stream_id);
1071: if(!data_s)
1072: /* Receiving a Stream ID not in the hash should not happen, this is an
1073: internal error more than anything else! */
1074: return NGHTTP2_ERR_CALLBACK_FAILURE;
1075:
1076: stream = data_s->req.protop;
1077: if(!stream)
1078: return NGHTTP2_ERR_CALLBACK_FAILURE;
1079: }
1080: else
1081: return NGHTTP2_ERR_INVALID_ARGUMENT;
1082:
1083: nread = CURLMIN(stream->upload_len, length);
1084: if(nread > 0) {
1085: memcpy(buf, stream->upload_mem, nread);
1086: stream->upload_mem += nread;
1087: stream->upload_len -= nread;
1088: if(data_s->state.infilesize != -1)
1089: stream->upload_left -= nread;
1090: }
1091:
1092: if(stream->upload_left == 0)
1093: *data_flags = NGHTTP2_DATA_FLAG_EOF;
1094: else if(nread == 0)
1095: return NGHTTP2_ERR_DEFERRED;
1096:
1097: H2BUGF(infof(data_s, "data_source_read_callback: "
1098: "returns %zu bytes stream %u\n",
1099: nread, stream_id));
1100:
1101: return nread;
1102: }
1103:
1104: #if !defined(CURL_DISABLE_VERBOSE_STRINGS)
1105: static int error_callback(nghttp2_session *session,
1106: const char *msg,
1107: size_t len,
1108: void *userp)
1109: {
1110: struct connectdata *conn = (struct connectdata *)userp;
1111: (void)session;
1112: infof(conn->data, "http2 error: %.*s\n", len, msg);
1113: return 0;
1114: }
1115: #endif
1116:
1117: static void populate_settings(struct connectdata *conn,
1118: struct http_conn *httpc)
1119: {
1120: nghttp2_settings_entry *iv = httpc->local_settings;
1121: DEBUGASSERT(conn->data);
1122:
1123: iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS;
1124: iv[0].value = Curl_multi_max_concurrent_streams(conn->data->multi);
1125:
1126: iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE;
1127: iv[1].value = HTTP2_HUGE_WINDOW_SIZE;
1128:
1129: iv[2].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH;
1130: iv[2].value = conn->data->multi->push_cb != NULL;
1131:
1132: httpc->local_settings_num = 3;
1133: }
1134:
1135: void Curl_http2_done(struct Curl_easy *data, bool premature)
1136: {
1137: struct HTTP *http = data->req.protop;
1138: struct http_conn *httpc = &data->conn->proto.httpc;
1139:
1140: /* there might be allocated resources done before this got the 'h2' pointer
1141: setup */
1142: if(http->header_recvbuf) {
1143: Curl_add_buffer_free(&http->header_recvbuf);
1144: Curl_add_buffer_free(&http->trailer_recvbuf);
1145: if(http->push_headers) {
1146: /* if they weren't used and then freed before */
1147: for(; http->push_headers_used > 0; --http->push_headers_used) {
1148: free(http->push_headers[http->push_headers_used - 1]);
1149: }
1150: free(http->push_headers);
1151: http->push_headers = NULL;
1152: }
1153: }
1154:
1155: if(!httpc->h2) /* not HTTP/2 ? */
1156: return;
1157:
1158: if(premature) {
1159: /* RST_STREAM */
1160: if(!nghttp2_submit_rst_stream(httpc->h2, NGHTTP2_FLAG_NONE,
1161: http->stream_id, NGHTTP2_STREAM_CLOSED))
1162: (void)nghttp2_session_send(httpc->h2);
1163:
1164: if(http->stream_id == httpc->pause_stream_id) {
1165: infof(data, "stopped the pause stream!\n");
1166: httpc->pause_stream_id = 0;
1167: }
1168: }
1169:
1170: if(data->state.drain)
1171: drained_transfer(data, httpc);
1172:
1173: /* -1 means unassigned and 0 means cleared */
1174: if(http->stream_id > 0) {
1175: int rv = nghttp2_session_set_stream_user_data(httpc->h2,
1176: http->stream_id, 0);
1177: if(rv) {
1178: infof(data, "http/2: failed to clear user_data for stream %d!\n",
1179: http->stream_id);
1180: DEBUGASSERT(0);
1181: }
1182: http->stream_id = 0;
1183: }
1184: }
1185:
1186: /*
1187: * Initialize nghttp2 for a Curl connection
1188: */
1189: static CURLcode http2_init(struct connectdata *conn)
1190: {
1191: if(!conn->proto.httpc.h2) {
1192: int rc;
1193: nghttp2_session_callbacks *callbacks;
1194:
1195: conn->proto.httpc.inbuf = malloc(H2_BUFSIZE);
1196: if(conn->proto.httpc.inbuf == NULL)
1197: return CURLE_OUT_OF_MEMORY;
1198:
1199: rc = nghttp2_session_callbacks_new(&callbacks);
1200:
1201: if(rc) {
1202: failf(conn->data, "Couldn't initialize nghttp2 callbacks!");
1203: return CURLE_OUT_OF_MEMORY; /* most likely at least */
1204: }
1205:
1206: /* nghttp2_send_callback */
1207: nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
1208: /* nghttp2_on_frame_recv_callback */
1209: nghttp2_session_callbacks_set_on_frame_recv_callback
1210: (callbacks, on_frame_recv);
1211: /* nghttp2_on_data_chunk_recv_callback */
1212: nghttp2_session_callbacks_set_on_data_chunk_recv_callback
1213: (callbacks, on_data_chunk_recv);
1214: /* nghttp2_on_stream_close_callback */
1215: nghttp2_session_callbacks_set_on_stream_close_callback
1216: (callbacks, on_stream_close);
1217: /* nghttp2_on_begin_headers_callback */
1218: nghttp2_session_callbacks_set_on_begin_headers_callback
1219: (callbacks, on_begin_headers);
1220: /* nghttp2_on_header_callback */
1221: nghttp2_session_callbacks_set_on_header_callback(callbacks, on_header);
1222:
1223: nghttp2_session_callbacks_set_error_callback(callbacks, error_callback);
1224:
1225: /* The nghttp2 session is not yet setup, do it */
1226: rc = nghttp2_session_client_new(&conn->proto.httpc.h2, callbacks, conn);
1227:
1228: nghttp2_session_callbacks_del(callbacks);
1229:
1230: if(rc) {
1231: failf(conn->data, "Couldn't initialize nghttp2!");
1232: return CURLE_OUT_OF_MEMORY; /* most likely at least */
1233: }
1234: }
1235: return CURLE_OK;
1236: }
1237:
1238: /*
1239: * Append headers to ask for a HTTP1.1 to HTTP2 upgrade.
1240: */
1241: CURLcode Curl_http2_request_upgrade(Curl_send_buffer *req,
1242: struct connectdata *conn)
1243: {
1244: CURLcode result;
1245: ssize_t binlen;
1246: char *base64;
1247: size_t blen;
1248: struct SingleRequest *k = &conn->data->req;
1249: uint8_t *binsettings = conn->proto.httpc.binsettings;
1250: struct http_conn *httpc = &conn->proto.httpc;
1251:
1252: populate_settings(conn, httpc);
1253:
1254: /* this returns number of bytes it wrote */
1255: binlen = nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN,
1256: httpc->local_settings,
1257: httpc->local_settings_num);
1258: if(!binlen) {
1259: failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload");
1260: Curl_add_buffer_free(&req);
1261: return CURLE_FAILED_INIT;
1262: }
1263: conn->proto.httpc.binlen = binlen;
1264:
1265: result = Curl_base64url_encode(conn->data, (const char *)binsettings, binlen,
1266: &base64, &blen);
1267: if(result) {
1268: Curl_add_buffer_free(&req);
1269: return result;
1270: }
1271:
1272: result = Curl_add_bufferf(&req,
1273: "Connection: Upgrade, HTTP2-Settings\r\n"
1274: "Upgrade: %s\r\n"
1275: "HTTP2-Settings: %s\r\n",
1276: NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, base64);
1277: free(base64);
1278:
1279: k->upgr101 = UPGR101_REQUESTED;
1280:
1281: return result;
1282: }
1283:
1284: /*
1285: * Returns nonzero if current HTTP/2 session should be closed.
1286: */
1287: static int should_close_session(struct http_conn *httpc)
1288: {
1289: return httpc->drain_total == 0 && !nghttp2_session_want_read(httpc->h2) &&
1290: !nghttp2_session_want_write(httpc->h2);
1291: }
1292:
1293: /*
1294: * h2_process_pending_input() processes pending input left in
1295: * httpc->inbuf. Then, call h2_session_send() to send pending data.
1296: * This function returns 0 if it succeeds, or -1 and error code will
1297: * be assigned to *err.
1298: */
1299: static int h2_process_pending_input(struct connectdata *conn,
1300: struct http_conn *httpc,
1301: CURLcode *err)
1302: {
1303: ssize_t nread;
1304: char *inbuf;
1305: ssize_t rv;
1306: struct Curl_easy *data = conn->data;
1307:
1308: nread = httpc->inbuflen - httpc->nread_inbuf;
1309: inbuf = httpc->inbuf + httpc->nread_inbuf;
1310:
1311: rv = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)inbuf, nread);
1312: if(rv < 0) {
1313: failf(data,
1314: "h2_process_pending_input: nghttp2_session_mem_recv() returned "
1315: "%zd:%s\n", rv, nghttp2_strerror((int)rv));
1316: *err = CURLE_RECV_ERROR;
1317: return -1;
1318: }
1319:
1320: if(nread == rv) {
1321: H2BUGF(infof(data,
1322: "h2_process_pending_input: All data in connection buffer "
1323: "processed\n"));
1324: httpc->inbuflen = 0;
1325: httpc->nread_inbuf = 0;
1326: }
1327: else {
1328: httpc->nread_inbuf += rv;
1329: H2BUGF(infof(data,
1330: "h2_process_pending_input: %zu bytes left in connection "
1331: "buffer\n",
1332: httpc->inbuflen - httpc->nread_inbuf));
1333: }
1334:
1335: rv = h2_session_send(data, httpc->h2);
1336: if(rv != 0) {
1337: *err = CURLE_SEND_ERROR;
1338: return -1;
1339: }
1340:
1341: if(should_close_session(httpc)) {
1342: H2BUGF(infof(data,
1343: "h2_process_pending_input: nothing to do in this session\n"));
1344: if(httpc->error_code)
1345: *err = CURLE_HTTP2;
1346: else {
1347: /* not an error per se, but should still close the connection */
1348: connclose(conn, "GOAWAY received");
1349: *err = CURLE_OK;
1350: }
1351: return -1;
1352: }
1353:
1354: return 0;
1355: }
1356:
1357: /*
1358: * Called from transfer.c:done_sending when we stop uploading.
1359: */
1360: CURLcode Curl_http2_done_sending(struct connectdata *conn)
1361: {
1362: CURLcode result = CURLE_OK;
1363:
1364: if((conn->handler == &Curl_handler_http2_ssl) ||
1365: (conn->handler == &Curl_handler_http2)) {
1366: /* make sure this is only attempted for HTTP/2 transfers */
1367:
1368: struct HTTP *stream = conn->data->req.protop;
1369:
1370: if(stream->upload_left) {
1371: /* If the stream still thinks there's data left to upload. */
1372: struct http_conn *httpc = &conn->proto.httpc;
1373: nghttp2_session *h2 = httpc->h2;
1374:
1375: stream->upload_left = 0; /* DONE! */
1376:
1377: /* resume sending here to trigger the callback to get called again so
1378: that it can signal EOF to nghttp2 */
1379: (void)nghttp2_session_resume_data(h2, stream->stream_id);
1380:
1381: (void)h2_process_pending_input(conn, httpc, &result);
1382: }
1383: }
1384: return result;
1385: }
1386:
1387: static ssize_t http2_handle_stream_close(struct connectdata *conn,
1388: struct Curl_easy *data,
1389: struct HTTP *stream, CURLcode *err)
1390: {
1391: char *trailer_pos, *trailer_end;
1392: CURLcode result;
1393: struct http_conn *httpc = &conn->proto.httpc;
1394:
1395: if(httpc->pause_stream_id == stream->stream_id) {
1396: httpc->pause_stream_id = 0;
1397: }
1398:
1399: drained_transfer(data, httpc);
1400:
1401: if(httpc->pause_stream_id == 0) {
1402: if(h2_process_pending_input(conn, httpc, err) != 0) {
1403: return -1;
1404: }
1405: }
1406:
1407: DEBUGASSERT(data->state.drain == 0);
1408:
1409: /* Reset to FALSE to prevent infinite loop in readwrite_data function. */
1410: stream->closed = FALSE;
1411: if(httpc->error_code == NGHTTP2_REFUSED_STREAM) {
1412: H2BUGF(infof(data, "REFUSED_STREAM (%d), try again on a new connection!\n",
1413: stream->stream_id));
1414: connclose(conn, "REFUSED_STREAM"); /* don't use this anymore */
1415: data->state.refused_stream = TRUE;
1416: *err = CURLE_RECV_ERROR; /* trigger Curl_retry_request() later */
1417: return -1;
1418: }
1419: else if(httpc->error_code != NGHTTP2_NO_ERROR) {
1420: failf(data, "HTTP/2 stream %d was not closed cleanly: %s (err %u)",
1421: stream->stream_id, nghttp2_strerror(httpc->error_code),
1422: httpc->error_code);
1423: *err = CURLE_HTTP2_STREAM;
1424: return -1;
1425: }
1426:
1427: if(!stream->bodystarted) {
1428: failf(data, "HTTP/2 stream %d was closed cleanly, but before getting "
1429: " all response header fields, treated as error",
1430: stream->stream_id);
1431: *err = CURLE_HTTP2_STREAM;
1432: return -1;
1433: }
1434:
1435: if(stream->trailer_recvbuf && stream->trailer_recvbuf->buffer) {
1436: trailer_pos = stream->trailer_recvbuf->buffer;
1437: trailer_end = trailer_pos + stream->trailer_recvbuf->size_used;
1438:
1439: for(; trailer_pos < trailer_end;) {
1440: uint32_t n;
1441: memcpy(&n, trailer_pos, sizeof(n));
1442: trailer_pos += sizeof(n);
1443:
1444: result = Curl_client_write(conn, CLIENTWRITE_HEADER, trailer_pos, n);
1445: if(result) {
1446: *err = result;
1447: return -1;
1448: }
1449:
1450: trailer_pos += n + 1;
1451: }
1452: }
1453:
1454: stream->close_handled = TRUE;
1455:
1456: H2BUGF(infof(data, "http2_recv returns 0, http2_handle_stream_close\n"));
1457: return 0;
1458: }
1459:
1460: /*
1461: * h2_pri_spec() fills in the pri_spec struct, used by nghttp2 to send weight
1462: * and dependency to the peer. It also stores the updated values in the state
1463: * struct.
1464: */
1465:
1466: static void h2_pri_spec(struct Curl_easy *data,
1467: nghttp2_priority_spec *pri_spec)
1468: {
1469: struct HTTP *depstream = (data->set.stream_depends_on?
1470: data->set.stream_depends_on->req.protop:NULL);
1471: int32_t depstream_id = depstream? depstream->stream_id:0;
1472: nghttp2_priority_spec_init(pri_spec, depstream_id, data->set.stream_weight,
1473: data->set.stream_depends_e);
1474: data->state.stream_weight = data->set.stream_weight;
1475: data->state.stream_depends_e = data->set.stream_depends_e;
1476: data->state.stream_depends_on = data->set.stream_depends_on;
1477: }
1478:
1479: /*
1480: * h2_session_send() checks if there's been an update in the priority /
1481: * dependency settings and if so it submits a PRIORITY frame with the updated
1482: * info.
1483: */
1484: static int h2_session_send(struct Curl_easy *data,
1485: nghttp2_session *h2)
1486: {
1487: struct HTTP *stream = data->req.protop;
1488: if((data->set.stream_weight != data->state.stream_weight) ||
1489: (data->set.stream_depends_e != data->state.stream_depends_e) ||
1490: (data->set.stream_depends_on != data->state.stream_depends_on) ) {
1491: /* send new weight and/or dependency */
1492: nghttp2_priority_spec pri_spec;
1493: int rv;
1494:
1495: h2_pri_spec(data, &pri_spec);
1496:
1497: H2BUGF(infof(data, "Queuing PRIORITY on stream %u (easy %p)\n",
1498: stream->stream_id, data));
1499: DEBUGASSERT(stream->stream_id != -1);
1500: rv = nghttp2_submit_priority(h2, NGHTTP2_FLAG_NONE, stream->stream_id,
1501: &pri_spec);
1502: if(rv)
1503: return rv;
1504: }
1505:
1506: return nghttp2_session_send(h2);
1507: }
1508:
1509: static ssize_t http2_recv(struct connectdata *conn, int sockindex,
1510: char *mem, size_t len, CURLcode *err)
1511: {
1512: CURLcode result = CURLE_OK;
1513: ssize_t rv;
1514: ssize_t nread;
1515: struct http_conn *httpc = &conn->proto.httpc;
1516: struct Curl_easy *data = conn->data;
1517: struct HTTP *stream = data->req.protop;
1518:
1519: (void)sockindex; /* we always do HTTP2 on sockindex 0 */
1520:
1521: if(should_close_session(httpc)) {
1522: H2BUGF(infof(data,
1523: "http2_recv: nothing to do in this session\n"));
1524: if(conn->bits.close) {
1525: /* already marked for closure, return OK and we're done */
1526: *err = CURLE_OK;
1527: return 0;
1528: }
1529: *err = CURLE_HTTP2;
1530: return -1;
1531: }
1532:
1533: /* Nullify here because we call nghttp2_session_send() and they
1534: might refer to the old buffer. */
1535: stream->upload_mem = NULL;
1536: stream->upload_len = 0;
1537:
1538: /*
1539: * At this point 'stream' is just in the Curl_easy the connection
1540: * identifies as its owner at this time.
1541: */
1542:
1543: if(stream->bodystarted &&
1544: stream->nread_header_recvbuf < stream->header_recvbuf->size_used) {
1545: /* If there is body data pending for this stream to return, do that */
1546: size_t left =
1547: stream->header_recvbuf->size_used - stream->nread_header_recvbuf;
1548: size_t ncopy = CURLMIN(len, left);
1549: memcpy(mem, stream->header_recvbuf->buffer + stream->nread_header_recvbuf,
1550: ncopy);
1551: stream->nread_header_recvbuf += ncopy;
1552:
1553: H2BUGF(infof(data, "http2_recv: Got %d bytes from header_recvbuf\n",
1554: (int)ncopy));
1555: return ncopy;
1556: }
1557:
1558: H2BUGF(infof(data, "http2_recv: easy %p (stream %u) win %u/%u\n",
1559: data, stream->stream_id,
1560: nghttp2_session_get_local_window_size(httpc->h2),
1561: nghttp2_session_get_stream_local_window_size(httpc->h2,
1562: stream->stream_id)
1563: ));
1564:
1565: if((data->state.drain) && stream->memlen) {
1566: H2BUGF(infof(data, "http2_recv: DRAIN %zu bytes stream %u!! (%p => %p)\n",
1567: stream->memlen, stream->stream_id,
1568: stream->mem, mem));
1569: if(mem != stream->mem) {
1570: /* if we didn't get the same buffer this time, we must move the data to
1571: the beginning */
1572: memmove(mem, stream->mem, stream->memlen);
1573: stream->len = len - stream->memlen;
1574: stream->mem = mem;
1575: }
1576: if(httpc->pause_stream_id == stream->stream_id && !stream->pausedata) {
1577: /* We have paused nghttp2, but we have no pause data (see
1578: on_data_chunk_recv). */
1579: httpc->pause_stream_id = 0;
1580: if(h2_process_pending_input(conn, httpc, &result) != 0) {
1581: *err = result;
1582: return -1;
1583: }
1584: }
1585: }
1586: else if(stream->pausedata) {
1587: DEBUGASSERT(httpc->pause_stream_id == stream->stream_id);
1588: nread = CURLMIN(len, stream->pauselen);
1589: memcpy(mem, stream->pausedata, nread);
1590:
1591: stream->pausedata += nread;
1592: stream->pauselen -= nread;
1593:
1594: if(stream->pauselen == 0) {
1595: H2BUGF(infof(data, "Unpaused by stream %u\n", stream->stream_id));
1596: DEBUGASSERT(httpc->pause_stream_id == stream->stream_id);
1597: httpc->pause_stream_id = 0;
1598:
1599: stream->pausedata = NULL;
1600: stream->pauselen = 0;
1601:
1602: /* When NGHTTP2_ERR_PAUSE is returned from
1603: data_source_read_callback, we might not process DATA frame
1604: fully. Calling nghttp2_session_mem_recv() again will
1605: continue to process DATA frame, but if there is no incoming
1606: frames, then we have to call it again with 0-length data.
1607: Without this, on_stream_close callback will not be called,
1608: and stream could be hanged. */
1609: if(h2_process_pending_input(conn, httpc, &result) != 0) {
1610: *err = result;
1611: return -1;
1612: }
1613: }
1614: H2BUGF(infof(data, "http2_recv: returns unpaused %zd bytes on stream %u\n",
1615: nread, stream->stream_id));
1616: return nread;
1617: }
1618: else if(httpc->pause_stream_id) {
1619: /* If a stream paused nghttp2_session_mem_recv previously, and has
1620: not processed all data, it still refers to the buffer in
1621: nghttp2_session. If we call nghttp2_session_mem_recv(), we may
1622: overwrite that buffer. To avoid that situation, just return
1623: here with CURLE_AGAIN. This could be busy loop since data in
1624: socket is not read. But it seems that usually streams are
1625: notified with its drain property, and socket is read again
1626: quickly. */
1627: if(stream->closed)
1628: /* closed overrides paused */
1629: return 0;
1630: H2BUGF(infof(data, "stream %x is paused, pause id: %x\n",
1631: stream->stream_id, httpc->pause_stream_id));
1632: *err = CURLE_AGAIN;
1633: return -1;
1634: }
1635: else {
1636: char *inbuf;
1637: /* remember where to store incoming data for this stream and how big the
1638: buffer is */
1639: stream->mem = mem;
1640: stream->len = len;
1641: stream->memlen = 0;
1642:
1643: if(httpc->inbuflen == 0) {
1644: nread = ((Curl_recv *)httpc->recv_underlying)(
1645: conn, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result);
1646:
1647: if(nread == -1) {
1648: if(result != CURLE_AGAIN)
1649: failf(data, "Failed receiving HTTP2 data");
1650: else if(stream->closed)
1651: /* received when the stream was already closed! */
1652: return http2_handle_stream_close(conn, data, stream, err);
1653:
1654: *err = result;
1655: return -1;
1656: }
1657:
1658: if(nread == 0) {
1659: H2BUGF(infof(data, "end of stream\n"));
1660: *err = CURLE_OK;
1661: return 0;
1662: }
1663:
1664: H2BUGF(infof(data, "nread=%zd\n", nread));
1665:
1666: httpc->inbuflen = nread;
1667: inbuf = httpc->inbuf;
1668: }
1669: else {
1670: nread = httpc->inbuflen - httpc->nread_inbuf;
1671: inbuf = httpc->inbuf + httpc->nread_inbuf;
1672:
1673: H2BUGF(infof(data, "Use data left in connection buffer, nread=%zd\n",
1674: nread));
1675: }
1676: rv = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)inbuf, nread);
1677:
1678: if(nghttp2_is_fatal((int)rv)) {
1679: failf(data, "nghttp2_session_mem_recv() returned %zd:%s\n",
1680: rv, nghttp2_strerror((int)rv));
1681: *err = CURLE_RECV_ERROR;
1682: return -1;
1683: }
1684: H2BUGF(infof(data, "nghttp2_session_mem_recv() returns %zd\n", rv));
1685: if(nread == rv) {
1686: H2BUGF(infof(data, "All data in connection buffer processed\n"));
1687: httpc->inbuflen = 0;
1688: httpc->nread_inbuf = 0;
1689: }
1690: else {
1691: httpc->nread_inbuf += rv;
1692: H2BUGF(infof(data, "%zu bytes left in connection buffer\n",
1693: httpc->inbuflen - httpc->nread_inbuf));
1694: }
1695: /* Always send pending frames in nghttp2 session, because
1696: nghttp2_session_mem_recv() may queue new frame */
1697: rv = h2_session_send(data, httpc->h2);
1698: if(rv != 0) {
1699: *err = CURLE_SEND_ERROR;
1700: return -1;
1701: }
1702:
1703: if(should_close_session(httpc)) {
1704: H2BUGF(infof(data, "http2_recv: nothing to do in this session\n"));
1705: *err = CURLE_HTTP2;
1706: return -1;
1707: }
1708: }
1709: if(stream->memlen) {
1710: ssize_t retlen = stream->memlen;
1711: H2BUGF(infof(data, "http2_recv: returns %zd for stream %u\n",
1712: retlen, stream->stream_id));
1713: stream->memlen = 0;
1714:
1715: if(httpc->pause_stream_id == stream->stream_id) {
1716: /* data for this stream is returned now, but this stream caused a pause
1717: already so we need it called again asap */
1718: H2BUGF(infof(data, "Data returned for PAUSED stream %u\n",
1719: stream->stream_id));
1720: }
1721: else if(!stream->closed) {
1722: drained_transfer(data, httpc);
1723: }
1724: else
1725: /* this stream is closed, trigger a another read ASAP to detect that */
1726: Curl_expire(data, 0, EXPIRE_RUN_NOW);
1727:
1728: return retlen;
1729: }
1730: if(stream->closed)
1731: return 0;
1732: *err = CURLE_AGAIN;
1733: H2BUGF(infof(data, "http2_recv returns AGAIN for stream %u\n",
1734: stream->stream_id));
1735: return -1;
1736: }
1737:
1738: /* Index where :authority header field will appear in request header
1739: field list. */
1740: #define AUTHORITY_DST_IDX 3
1741:
1742: /* USHRT_MAX is 65535 == 0xffff */
1743: #define HEADER_OVERFLOW(x) \
1744: (x.namelen > 0xffff || x.valuelen > 0xffff - x.namelen)
1745:
1746: /*
1747: * Check header memory for the token "trailers".
1748: * Parse the tokens as separated by comma and surrounded by whitespace.
1749: * Returns TRUE if found or FALSE if not.
1750: */
1751: static bool contains_trailers(const char *p, size_t len)
1752: {
1753: const char *end = p + len;
1754: for(;;) {
1755: for(; p != end && (*p == ' ' || *p == '\t'); ++p)
1756: ;
1757: if(p == end || (size_t)(end - p) < sizeof("trailers") - 1)
1758: return FALSE;
1759: if(strncasecompare("trailers", p, sizeof("trailers") - 1)) {
1760: p += sizeof("trailers") - 1;
1761: for(; p != end && (*p == ' ' || *p == '\t'); ++p)
1762: ;
1763: if(p == end || *p == ',')
1764: return TRUE;
1765: }
1766: /* skip to next token */
1767: for(; p != end && *p != ','; ++p)
1768: ;
1769: if(p == end)
1770: return FALSE;
1771: ++p;
1772: }
1773: }
1774:
1775: typedef enum {
1776: /* Send header to server */
1777: HEADERINST_FORWARD,
1778: /* Don't send header to server */
1779: HEADERINST_IGNORE,
1780: /* Discard header, and replace it with "te: trailers" */
1781: HEADERINST_TE_TRAILERS
1782: } header_instruction;
1783:
1784: /* Decides how to treat given header field. */
1785: static header_instruction inspect_header(const char *name, size_t namelen,
1786: const char *value, size_t valuelen) {
1787: switch(namelen) {
1788: case 2:
1789: if(!strncasecompare("te", name, namelen))
1790: return HEADERINST_FORWARD;
1791:
1792: return contains_trailers(value, valuelen) ?
1793: HEADERINST_TE_TRAILERS : HEADERINST_IGNORE;
1794: case 7:
1795: return strncasecompare("upgrade", name, namelen) ?
1796: HEADERINST_IGNORE : HEADERINST_FORWARD;
1797: case 10:
1798: return (strncasecompare("connection", name, namelen) ||
1799: strncasecompare("keep-alive", name, namelen)) ?
1800: HEADERINST_IGNORE : HEADERINST_FORWARD;
1801: case 16:
1802: return strncasecompare("proxy-connection", name, namelen) ?
1803: HEADERINST_IGNORE : HEADERINST_FORWARD;
1804: case 17:
1805: return strncasecompare("transfer-encoding", name, namelen) ?
1806: HEADERINST_IGNORE : HEADERINST_FORWARD;
1807: default:
1808: return HEADERINST_FORWARD;
1809: }
1810: }
1811:
1812: static ssize_t http2_send(struct connectdata *conn, int sockindex,
1813: const void *mem, size_t len, CURLcode *err)
1814: {
1815: /*
1816: * Currently, we send request in this function, but this function is also
1817: * used to send request body. It would be nice to add dedicated function for
1818: * request.
1819: */
1820: int rv;
1821: struct http_conn *httpc = &conn->proto.httpc;
1822: struct HTTP *stream = conn->data->req.protop;
1823: nghttp2_nv *nva = NULL;
1824: size_t nheader;
1825: size_t i;
1826: size_t authority_idx;
1827: char *hdbuf = (char *)mem;
1828: char *end, *line_end;
1829: nghttp2_data_provider data_prd;
1830: int32_t stream_id;
1831: nghttp2_session *h2 = httpc->h2;
1832: nghttp2_priority_spec pri_spec;
1833:
1834: (void)sockindex;
1835:
1836: H2BUGF(infof(conn->data, "http2_send len=%zu\n", len));
1837:
1838: if(stream->stream_id != -1) {
1839: if(stream->close_handled) {
1840: infof(conn->data, "stream %d closed\n", stream->stream_id);
1841: *err = CURLE_HTTP2_STREAM;
1842: return -1;
1843: }
1844: else if(stream->closed) {
1845: return http2_handle_stream_close(conn, conn->data, stream, err);
1846: }
1847: /* If stream_id != -1, we have dispatched request HEADERS, and now
1848: are going to send or sending request body in DATA frame */
1849: stream->upload_mem = mem;
1850: stream->upload_len = len;
1851: rv = nghttp2_session_resume_data(h2, stream->stream_id);
1852: if(nghttp2_is_fatal(rv)) {
1853: *err = CURLE_SEND_ERROR;
1854: return -1;
1855: }
1856: rv = h2_session_send(conn->data, h2);
1857: if(nghttp2_is_fatal(rv)) {
1858: *err = CURLE_SEND_ERROR;
1859: return -1;
1860: }
1861: len -= stream->upload_len;
1862:
1863: /* Nullify here because we call nghttp2_session_send() and they
1864: might refer to the old buffer. */
1865: stream->upload_mem = NULL;
1866: stream->upload_len = 0;
1867:
1868: if(should_close_session(httpc)) {
1869: H2BUGF(infof(conn->data, "http2_send: nothing to do in this session\n"));
1870: *err = CURLE_HTTP2;
1871: return -1;
1872: }
1873:
1874: if(stream->upload_left) {
1875: /* we are sure that we have more data to send here. Calling the
1876: following API will make nghttp2_session_want_write() return
1877: nonzero if remote window allows it, which then libcurl checks
1878: socket is writable or not. See http2_perform_getsock(). */
1879: nghttp2_session_resume_data(h2, stream->stream_id);
1880: }
1881:
1882: H2BUGF(infof(conn->data, "http2_send returns %zu for stream %u\n", len,
1883: stream->stream_id));
1884: return len;
1885: }
1886:
1887: /* Calculate number of headers contained in [mem, mem + len) */
1888: /* Here, we assume the curl http code generate *correct* HTTP header
1889: field block */
1890: nheader = 0;
1891: for(i = 1; i < len; ++i) {
1892: if(hdbuf[i] == '\n' && hdbuf[i - 1] == '\r') {
1893: ++nheader;
1894: ++i;
1895: }
1896: }
1897: if(nheader < 2)
1898: goto fail;
1899:
1900: /* We counted additional 2 \r\n in the first and last line. We need 3
1901: new headers: :method, :path and :scheme. Therefore we need one
1902: more space. */
1903: nheader += 1;
1904: nva = malloc(sizeof(nghttp2_nv) * nheader);
1905: if(nva == NULL) {
1906: *err = CURLE_OUT_OF_MEMORY;
1907: return -1;
1908: }
1909:
1910: /* Extract :method, :path from request line
1911: We do line endings with CRLF so checking for CR is enough */
1912: line_end = memchr(hdbuf, '\r', len);
1913: if(!line_end)
1914: goto fail;
1915:
1916: /* Method does not contain spaces */
1917: end = memchr(hdbuf, ' ', line_end - hdbuf);
1918: if(!end || end == hdbuf)
1919: goto fail;
1920: nva[0].name = (unsigned char *)":method";
1921: nva[0].namelen = strlen((char *)nva[0].name);
1922: nva[0].value = (unsigned char *)hdbuf;
1923: nva[0].valuelen = (size_t)(end - hdbuf);
1924: nva[0].flags = NGHTTP2_NV_FLAG_NONE;
1925: if(HEADER_OVERFLOW(nva[0])) {
1926: failf(conn->data, "Failed sending HTTP request: Header overflow");
1927: goto fail;
1928: }
1929:
1930: hdbuf = end + 1;
1931:
1932: /* Path may contain spaces so scan backwards */
1933: end = NULL;
1934: for(i = (size_t)(line_end - hdbuf); i; --i) {
1935: if(hdbuf[i - 1] == ' ') {
1936: end = &hdbuf[i - 1];
1937: break;
1938: }
1939: }
1940: if(!end || end == hdbuf)
1941: goto fail;
1942: nva[1].name = (unsigned char *)":path";
1943: nva[1].namelen = strlen((char *)nva[1].name);
1944: nva[1].value = (unsigned char *)hdbuf;
1945: nva[1].valuelen = (size_t)(end - hdbuf);
1946: nva[1].flags = NGHTTP2_NV_FLAG_NONE;
1947: if(HEADER_OVERFLOW(nva[1])) {
1948: failf(conn->data, "Failed sending HTTP request: Header overflow");
1949: goto fail;
1950: }
1951:
1952: nva[2].name = (unsigned char *)":scheme";
1953: nva[2].namelen = strlen((char *)nva[2].name);
1954: if(conn->handler->flags & PROTOPT_SSL)
1955: nva[2].value = (unsigned char *)"https";
1956: else
1957: nva[2].value = (unsigned char *)"http";
1958: nva[2].valuelen = strlen((char *)nva[2].value);
1959: nva[2].flags = NGHTTP2_NV_FLAG_NONE;
1960: if(HEADER_OVERFLOW(nva[2])) {
1961: failf(conn->data, "Failed sending HTTP request: Header overflow");
1962: goto fail;
1963: }
1964:
1965: authority_idx = 0;
1966: i = 3;
1967: while(i < nheader) {
1968: size_t hlen;
1969:
1970: hdbuf = line_end + 2;
1971:
1972: /* check for next CR, but only within the piece of data left in the given
1973: buffer */
1974: line_end = memchr(hdbuf, '\r', len - (hdbuf - (char *)mem));
1975: if(!line_end || (line_end == hdbuf))
1976: goto fail;
1977:
1978: /* header continuation lines are not supported */
1979: if(*hdbuf == ' ' || *hdbuf == '\t')
1980: goto fail;
1981:
1982: for(end = hdbuf; end < line_end && *end != ':'; ++end)
1983: ;
1984: if(end == hdbuf || end == line_end)
1985: goto fail;
1986: hlen = end - hdbuf;
1987:
1988: if(hlen == 4 && strncasecompare("host", hdbuf, 4)) {
1989: authority_idx = i;
1990: nva[i].name = (unsigned char *)":authority";
1991: nva[i].namelen = strlen((char *)nva[i].name);
1992: }
1993: else {
1994: nva[i].namelen = (size_t)(end - hdbuf);
1995: /* Lower case the header name for HTTP/2 */
1996: Curl_strntolower((char *)hdbuf, hdbuf, nva[i].namelen);
1997: nva[i].name = (unsigned char *)hdbuf;
1998: }
1999: hdbuf = end + 1;
2000: while(*hdbuf == ' ' || *hdbuf == '\t')
2001: ++hdbuf;
2002: end = line_end;
2003:
2004: switch(inspect_header((const char *)nva[i].name, nva[i].namelen, hdbuf,
2005: end - hdbuf)) {
2006: case HEADERINST_IGNORE:
2007: /* skip header fields prohibited by HTTP/2 specification. */
2008: --nheader;
2009: continue;
2010: case HEADERINST_TE_TRAILERS:
2011: nva[i].value = (uint8_t*)"trailers";
2012: nva[i].valuelen = sizeof("trailers") - 1;
2013: break;
2014: default:
2015: nva[i].value = (unsigned char *)hdbuf;
2016: nva[i].valuelen = (size_t)(end - hdbuf);
2017: }
2018:
2019: nva[i].flags = NGHTTP2_NV_FLAG_NONE;
2020: if(HEADER_OVERFLOW(nva[i])) {
2021: failf(conn->data, "Failed sending HTTP request: Header overflow");
2022: goto fail;
2023: }
2024: ++i;
2025: }
2026:
2027: /* :authority must come before non-pseudo header fields */
2028: if(authority_idx != 0 && authority_idx != AUTHORITY_DST_IDX) {
2029: nghttp2_nv authority = nva[authority_idx];
2030: for(i = authority_idx; i > AUTHORITY_DST_IDX; --i) {
2031: nva[i] = nva[i - 1];
2032: }
2033: nva[i] = authority;
2034: }
2035:
2036: /* Warn stream may be rejected if cumulative length of headers is too large.
2037: It appears nghttp2 will not send a header frame larger than 64KB. */
2038: #define MAX_ACC 60000 /* <64KB to account for some overhead */
2039: {
2040: size_t acc = 0;
2041:
2042: for(i = 0; i < nheader; ++i) {
2043: acc += nva[i].namelen + nva[i].valuelen;
2044:
2045: H2BUGF(infof(conn->data, "h2 header: %.*s:%.*s\n",
2046: nva[i].namelen, nva[i].name,
2047: nva[i].valuelen, nva[i].value));
2048: }
2049:
2050: if(acc > MAX_ACC) {
2051: infof(conn->data, "http2_send: Warning: The cumulative length of all "
2052: "headers exceeds %zu bytes and that could cause the "
2053: "stream to be rejected.\n", MAX_ACC);
2054: }
2055: }
2056:
2057: h2_pri_spec(conn->data, &pri_spec);
2058:
2059: switch(conn->data->set.httpreq) {
2060: case HTTPREQ_POST:
2061: case HTTPREQ_POST_FORM:
2062: case HTTPREQ_POST_MIME:
2063: case HTTPREQ_PUT:
2064: if(conn->data->state.infilesize != -1)
2065: stream->upload_left = conn->data->state.infilesize;
2066: else
2067: /* data sending without specifying the data amount up front */
2068: stream->upload_left = -1; /* unknown, but not zero */
2069:
2070: data_prd.read_callback = data_source_read_callback;
2071: data_prd.source.ptr = NULL;
2072: stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader,
2073: &data_prd, conn->data);
2074: break;
2075: default:
2076: stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader,
2077: NULL, conn->data);
2078: }
2079:
2080: Curl_safefree(nva);
2081:
2082: if(stream_id < 0) {
2083: H2BUGF(infof(conn->data, "http2_send() send error\n"));
2084: *err = CURLE_SEND_ERROR;
2085: return -1;
2086: }
2087:
2088: infof(conn->data, "Using Stream ID: %x (easy handle %p)\n",
2089: stream_id, (void *)conn->data);
2090: stream->stream_id = stream_id;
2091:
2092: /* this does not call h2_session_send() since there can not have been any
2093: * priority upodate since the nghttp2_submit_request() call above */
2094: rv = nghttp2_session_send(h2);
2095:
2096: if(rv != 0) {
2097: *err = CURLE_SEND_ERROR;
2098: return -1;
2099: }
2100:
2101: if(should_close_session(httpc)) {
2102: H2BUGF(infof(conn->data, "http2_send: nothing to do in this session\n"));
2103: *err = CURLE_HTTP2;
2104: return -1;
2105: }
2106:
2107: /* If whole HEADERS frame was sent off to the underlying socket, the nghttp2
2108: library calls data_source_read_callback. But only it found that no data
2109: available, so it deferred the DATA transmission. Which means that
2110: nghttp2_session_want_write() returns 0 on http2_perform_getsock(), which
2111: results that no writable socket check is performed. To workaround this,
2112: we issue nghttp2_session_resume_data() here to bring back DATA
2113: transmission from deferred state. */
2114: nghttp2_session_resume_data(h2, stream->stream_id);
2115:
2116: return len;
2117:
2118: fail:
2119: free(nva);
2120: *err = CURLE_SEND_ERROR;
2121: return -1;
2122: }
2123:
2124: CURLcode Curl_http2_setup(struct connectdata *conn)
2125: {
2126: CURLcode result;
2127: struct http_conn *httpc = &conn->proto.httpc;
2128: struct HTTP *stream = conn->data->req.protop;
2129:
2130: stream->stream_id = -1;
2131:
2132: if(!stream->header_recvbuf) {
2133: stream->header_recvbuf = Curl_add_buffer_init();
2134: if(!stream->header_recvbuf)
2135: return CURLE_OUT_OF_MEMORY;
2136: }
2137:
2138: if((conn->handler == &Curl_handler_http2_ssl) ||
2139: (conn->handler == &Curl_handler_http2))
2140: return CURLE_OK; /* already done */
2141:
2142: if(conn->handler->flags & PROTOPT_SSL)
2143: conn->handler = &Curl_handler_http2_ssl;
2144: else
2145: conn->handler = &Curl_handler_http2;
2146:
2147: result = http2_init(conn);
2148: if(result) {
2149: Curl_add_buffer_free(&stream->header_recvbuf);
2150: return result;
2151: }
2152:
2153: infof(conn->data, "Using HTTP2, server supports multi-use\n");
2154: stream->upload_left = 0;
2155: stream->upload_mem = NULL;
2156: stream->upload_len = 0;
2157:
2158: httpc->inbuflen = 0;
2159: httpc->nread_inbuf = 0;
2160:
2161: httpc->pause_stream_id = 0;
2162: httpc->drain_total = 0;
2163:
2164: conn->bits.multiplex = TRUE; /* at least potentially multiplexed */
2165: conn->httpversion = 20;
2166: conn->bundle->multiuse = BUNDLE_MULTIPLEX;
2167:
2168: infof(conn->data, "Connection state changed (HTTP/2 confirmed)\n");
2169: multi_connchanged(conn->data->multi);
2170:
2171: return CURLE_OK;
2172: }
2173:
2174: CURLcode Curl_http2_switched(struct connectdata *conn,
2175: const char *mem, size_t nread)
2176: {
2177: CURLcode result;
2178: struct http_conn *httpc = &conn->proto.httpc;
2179: int rv;
2180: ssize_t nproc;
2181: struct Curl_easy *data = conn->data;
2182: struct HTTP *stream = conn->data->req.protop;
2183:
2184: result = Curl_http2_setup(conn);
2185: if(result)
2186: return result;
2187:
2188: httpc->recv_underlying = conn->recv[FIRSTSOCKET];
2189: httpc->send_underlying = conn->send[FIRSTSOCKET];
2190: conn->recv[FIRSTSOCKET] = http2_recv;
2191: conn->send[FIRSTSOCKET] = http2_send;
2192:
2193: if(conn->data->req.upgr101 == UPGR101_RECEIVED) {
2194: /* stream 1 is opened implicitly on upgrade */
2195: stream->stream_id = 1;
2196: /* queue SETTINGS frame (again) */
2197: rv = nghttp2_session_upgrade(httpc->h2, httpc->binsettings,
2198: httpc->binlen, NULL);
2199: if(rv != 0) {
2200: failf(data, "nghttp2_session_upgrade() failed: %s(%d)",
2201: nghttp2_strerror(rv), rv);
2202: return CURLE_HTTP2;
2203: }
2204:
2205: rv = nghttp2_session_set_stream_user_data(httpc->h2,
2206: stream->stream_id,
2207: data);
2208: if(rv) {
2209: infof(data, "http/2: failed to set user_data for stream %d!\n",
2210: stream->stream_id);
2211: DEBUGASSERT(0);
2212: }
2213: }
2214: else {
2215: populate_settings(conn, httpc);
2216:
2217: /* stream ID is unknown at this point */
2218: stream->stream_id = -1;
2219: rv = nghttp2_submit_settings(httpc->h2, NGHTTP2_FLAG_NONE,
2220: httpc->local_settings,
2221: httpc->local_settings_num);
2222: if(rv != 0) {
2223: failf(data, "nghttp2_submit_settings() failed: %s(%d)",
2224: nghttp2_strerror(rv), rv);
2225: return CURLE_HTTP2;
2226: }
2227: }
2228:
2229: rv = nghttp2_session_set_local_window_size(httpc->h2, NGHTTP2_FLAG_NONE, 0,
2230: HTTP2_HUGE_WINDOW_SIZE);
2231: if(rv != 0) {
2232: failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)",
2233: nghttp2_strerror(rv), rv);
2234: return CURLE_HTTP2;
2235: }
2236:
2237: /* we are going to copy mem to httpc->inbuf. This is required since
2238: mem is part of buffer pointed by stream->mem, and callbacks
2239: called by nghttp2_session_mem_recv() will write stream specific
2240: data into stream->mem, overwriting data already there. */
2241: if(H2_BUFSIZE < nread) {
2242: failf(data, "connection buffer size is too small to store data following "
2243: "HTTP Upgrade response header: buflen=%zu, datalen=%zu",
2244: H2_BUFSIZE, nread);
2245: return CURLE_HTTP2;
2246: }
2247:
2248: infof(conn->data, "Copying HTTP/2 data in stream buffer to connection buffer"
2249: " after upgrade: len=%zu\n",
2250: nread);
2251:
2252: if(nread)
2253: memcpy(httpc->inbuf, mem, nread);
2254: httpc->inbuflen = nread;
2255:
2256: nproc = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)httpc->inbuf,
2257: httpc->inbuflen);
2258:
2259: if(nghttp2_is_fatal((int)nproc)) {
2260: failf(data, "nghttp2_session_mem_recv() failed: %s(%d)",
2261: nghttp2_strerror((int)nproc), (int)nproc);
2262: return CURLE_HTTP2;
2263: }
2264:
2265: H2BUGF(infof(data, "nghttp2_session_mem_recv() returns %zd\n", nproc));
2266:
2267: if((ssize_t)nread == nproc) {
2268: httpc->inbuflen = 0;
2269: httpc->nread_inbuf = 0;
2270: }
2271: else {
2272: httpc->nread_inbuf += nproc;
2273: }
2274:
2275: /* Try to send some frames since we may read SETTINGS already. */
2276: rv = h2_session_send(data, httpc->h2);
2277:
2278: if(rv != 0) {
2279: failf(data, "nghttp2_session_send() failed: %s(%d)",
2280: nghttp2_strerror(rv), rv);
2281: return CURLE_HTTP2;
2282: }
2283:
2284: if(should_close_session(httpc)) {
2285: H2BUGF(infof(data,
2286: "nghttp2_session_send(): nothing to do in this session\n"));
2287: return CURLE_HTTP2;
2288: }
2289:
2290: return CURLE_OK;
2291: }
2292:
2293: CURLcode Curl_http2_stream_pause(struct Curl_easy *data, bool pause)
2294: {
2295: DEBUGASSERT(data);
2296: DEBUGASSERT(data->conn);
2297: /* if it isn't HTTP/2, we're done */
2298: if(!data->conn->proto.httpc.h2)
2299: return CURLE_OK;
2300: #ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE
2301: else {
2302: struct HTTP *stream = data->req.protop;
2303: struct http_conn *httpc = &data->conn->proto.httpc;
2304: uint32_t window = !pause * HTTP2_HUGE_WINDOW_SIZE;
2305: int rv = nghttp2_session_set_local_window_size(httpc->h2,
2306: NGHTTP2_FLAG_NONE,
2307: stream->stream_id,
2308: window);
2309: if(rv) {
2310: failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)",
2311: nghttp2_strerror(rv), rv);
2312: return CURLE_HTTP2;
2313: }
2314:
2315: /* make sure the window update gets sent */
2316: rv = h2_session_send(data, httpc->h2);
2317: if(rv)
2318: return CURLE_SEND_ERROR;
2319:
2320: DEBUGF(infof(data, "Set HTTP/2 window size to %u for stream %u\n",
2321: window, stream->stream_id));
2322:
2323: #ifdef DEBUGBUILD
2324: {
2325: /* read out the stream local window again */
2326: uint32_t window2 =
2327: nghttp2_session_get_stream_local_window_size(httpc->h2,
2328: stream->stream_id);
2329: DEBUGF(infof(data, "HTTP/2 window size is now %u for stream %u\n",
2330: window2, stream->stream_id));
2331: }
2332: #endif
2333: }
2334: #endif
2335: return CURLE_OK;
2336: }
2337:
2338: CURLcode Curl_http2_add_child(struct Curl_easy *parent,
2339: struct Curl_easy *child,
2340: bool exclusive)
2341: {
2342: if(parent) {
2343: struct Curl_http2_dep **tail;
2344: struct Curl_http2_dep *dep = calloc(1, sizeof(struct Curl_http2_dep));
2345: if(!dep)
2346: return CURLE_OUT_OF_MEMORY;
2347: dep->data = child;
2348:
2349: if(parent->set.stream_dependents && exclusive) {
2350: struct Curl_http2_dep *node = parent->set.stream_dependents;
2351: while(node) {
2352: node->data->set.stream_depends_on = child;
2353: node = node->next;
2354: }
2355:
2356: tail = &child->set.stream_dependents;
2357: while(*tail)
2358: tail = &(*tail)->next;
2359:
2360: DEBUGASSERT(!*tail);
2361: *tail = parent->set.stream_dependents;
2362: parent->set.stream_dependents = 0;
2363: }
2364:
2365: tail = &parent->set.stream_dependents;
2366: while(*tail) {
2367: (*tail)->data->set.stream_depends_e = FALSE;
2368: tail = &(*tail)->next;
2369: }
2370:
2371: DEBUGASSERT(!*tail);
2372: *tail = dep;
2373: }
2374:
2375: child->set.stream_depends_on = parent;
2376: child->set.stream_depends_e = exclusive;
2377: return CURLE_OK;
2378: }
2379:
2380: void Curl_http2_remove_child(struct Curl_easy *parent, struct Curl_easy *child)
2381: {
2382: struct Curl_http2_dep *last = 0;
2383: struct Curl_http2_dep *data = parent->set.stream_dependents;
2384: DEBUGASSERT(child->set.stream_depends_on == parent);
2385:
2386: while(data && data->data != child) {
2387: last = data;
2388: data = data->next;
2389: }
2390:
2391: DEBUGASSERT(data);
2392:
2393: if(data) {
2394: if(last) {
2395: last->next = data->next;
2396: }
2397: else {
2398: parent->set.stream_dependents = data->next;
2399: }
2400: free(data);
2401: }
2402:
2403: child->set.stream_depends_on = 0;
2404: child->set.stream_depends_e = FALSE;
2405: }
2406:
2407: void Curl_http2_cleanup_dependencies(struct Curl_easy *data)
2408: {
2409: while(data->set.stream_dependents) {
2410: struct Curl_easy *tmp = data->set.stream_dependents->data;
2411: Curl_http2_remove_child(data, tmp);
2412: if(data->set.stream_depends_on)
2413: Curl_http2_add_child(data->set.stream_depends_on, tmp, FALSE);
2414: }
2415:
2416: if(data->set.stream_depends_on)
2417: Curl_http2_remove_child(data->set.stream_depends_on, data);
2418: }
2419:
2420: /* Only call this function for a transfer that already got a HTTP/2
2421: CURLE_HTTP2_STREAM error! */
2422: bool Curl_h2_http_1_1_error(struct connectdata *conn)
2423: {
2424: struct http_conn *httpc = &conn->proto.httpc;
2425: return (httpc->error_code == NGHTTP2_HTTP_1_1_REQUIRED);
2426: }
2427:
2428: #else /* !USE_NGHTTP2 */
2429:
2430: /* Satisfy external references even if http2 is not compiled in. */
2431: #include <curl/curl.h>
2432:
2433: char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num)
2434: {
2435: (void) h;
2436: (void) num;
2437: return NULL;
2438: }
2439:
2440: char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header)
2441: {
2442: (void) h;
2443: (void) header;
2444: return NULL;
2445: }
2446:
2447: #endif /* USE_NGHTTP2 */
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