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Diffstat (limited to 'Utilities/cmcurl/lib/http2.c')
| -rw-r--r-- | Utilities/cmcurl/lib/http2.c | 1562 |
1 files changed, 1562 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/http2.c b/Utilities/cmcurl/lib/http2.c new file mode 100644 index 0000000..0024add --- /dev/null +++ b/Utilities/cmcurl/lib/http2.c @@ -0,0 +1,1562 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2015, Daniel Stenberg, <daniel@haxx.se>, et al. + * + * This software is licensed as described in the file COPYING, which + * you should have received as part of this distribution. The terms + * are also available at http://curl.haxx.se/docs/copyright.html. + * + * You may opt to use, copy, modify, merge, publish, distribute and/or sell + * copies of the Software, and permit persons to whom the Software is + * furnished to do so, under the terms of the COPYING file. + * + * This software is distributed on an "AS IS" basis, WITHOUT WARRANTY OF ANY + * KIND, either express or implied. + * + ***************************************************************************/ + +#include "curl_setup.h" + +#ifdef USE_NGHTTP2 +#include "curl_printf.h" +#include <nghttp2/nghttp2.h> +#include "urldata.h" +#include "http2.h" +#include "http.h" +#include "sendf.h" +#include "curl_base64.h" +#include "rawstr.h" +#include "multiif.h" +#include "conncache.h" +#include "url.h" + +/* The last #include files should be: */ +#include "curl_memory.h" +#include "memdebug.h" + +#define MIN(x,y) ((x)<(y)?(x):(y)) + +#if (NGHTTP2_VERSION_NUM < 0x000600) +#error too old nghttp2 version, upgrade! +#endif + +static int http2_perform_getsock(const struct connectdata *conn, + curl_socket_t *sock, /* points to + numsocks + number of + sockets */ + int numsocks) +{ + const struct http_conn *c = &conn->proto.httpc; + int bitmap = GETSOCK_BLANK; + (void)numsocks; + + /* TODO We should check underlying socket state if it is SSL socket + because of renegotiation. */ + sock[0] = conn->sock[FIRSTSOCKET]; + + if(nghttp2_session_want_read(c->h2)) + bitmap |= GETSOCK_READSOCK(FIRSTSOCKET); + + if(nghttp2_session_want_write(c->h2)) + bitmap |= GETSOCK_WRITESOCK(FIRSTSOCKET); + + return bitmap; +} + +static int http2_getsock(struct connectdata *conn, + curl_socket_t *sock, /* points to numsocks + number of sockets */ + int numsocks) +{ + return http2_perform_getsock(conn, sock, numsocks); +} + +static CURLcode http2_disconnect(struct connectdata *conn, + bool dead_connection) +{ + struct HTTP *http = conn->data->req.protop; + struct http_conn *c = &conn->proto.httpc; + (void)dead_connection; + + DEBUGF(infof(conn->data, "HTTP/2 DISCONNECT starts now\n")); + + nghttp2_session_del(c->h2); + Curl_safefree(c->inbuf); + + if(http) { + Curl_add_buffer_free(http->header_recvbuf); + http->header_recvbuf = NULL; /* clear the pointer */ + for(; http->push_headers_used > 0; --http->push_headers_used) { + free(http->push_headers[http->push_headers_used - 1]); + } + free(http->push_headers); + http->push_headers = NULL; + } + + DEBUGF(infof(conn->data, "HTTP/2 DISCONNECT done\n")); + + return CURLE_OK; +} + +/* called from Curl_http_setup_conn */ +void Curl_http2_setup_req(struct SessionHandle *data) +{ + struct HTTP *http = data->req.protop; + + http->nread_header_recvbuf = 0; + http->bodystarted = FALSE; + http->status_code = -1; + http->pausedata = NULL; + http->pauselen = 0; + http->error_code = NGHTTP2_NO_ERROR; + http->closed = FALSE; + http->mem = data->state.buffer; + http->len = BUFSIZE; + http->memlen = 0; +} + +/* called from Curl_http_setup_conn */ +void Curl_http2_setup_conn(struct connectdata *conn) +{ + conn->proto.httpc.settings.max_concurrent_streams = + DEFAULT_MAX_CONCURRENT_STREAMS; +} + +/* + * HTTP2 handler interface. This isn't added to the general list of protocols + * but will be used at run-time when the protocol is dynamically switched from + * HTTP to HTTP2. + */ +const struct Curl_handler Curl_handler_http2 = { + "HTTP2", /* scheme */ + ZERO_NULL, /* setup_connection */ + Curl_http, /* do_it */ + Curl_http_done, /* done */ + ZERO_NULL, /* do_more */ + ZERO_NULL, /* connect_it */ + ZERO_NULL, /* connecting */ + ZERO_NULL, /* doing */ + http2_getsock, /* proto_getsock */ + http2_getsock, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + http2_perform_getsock, /* perform_getsock */ + http2_disconnect, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_HTTP, /* defport */ + CURLPROTO_HTTP, /* protocol */ + PROTOPT_NONE /* flags */ +}; + +const struct Curl_handler Curl_handler_http2_ssl = { + "HTTP2", /* scheme */ + ZERO_NULL, /* setup_connection */ + Curl_http, /* do_it */ + Curl_http_done, /* done */ + ZERO_NULL, /* do_more */ + ZERO_NULL, /* connect_it */ + ZERO_NULL, /* connecting */ + ZERO_NULL, /* doing */ + http2_getsock, /* proto_getsock */ + http2_getsock, /* doing_getsock */ + ZERO_NULL, /* domore_getsock */ + http2_perform_getsock, /* perform_getsock */ + http2_disconnect, /* disconnect */ + ZERO_NULL, /* readwrite */ + PORT_HTTP, /* defport */ + CURLPROTO_HTTPS, /* protocol */ + PROTOPT_SSL /* flags */ +}; + +/* + * Store nghttp2 version info in this buffer, Prefix with a space. Return + * total length written. + */ +int Curl_http2_ver(char *p, size_t len) +{ + nghttp2_info *h2 = nghttp2_version(0); + return snprintf(p, len, " nghttp2/%s", h2->version_str); +} + +/* + * The implementation of nghttp2_send_callback type. Here we write |data| with + * size |length| to the network and return the number of bytes actually + * written. See the documentation of nghttp2_send_callback for the details. + */ +static ssize_t send_callback(nghttp2_session *h2, + const uint8_t *data, size_t length, int flags, + void *userp) +{ + struct connectdata *conn = (struct connectdata *)userp; + struct http_conn *c = &conn->proto.httpc; + ssize_t written; + CURLcode result = CURLE_OK; + + (void)h2; + (void)flags; + + written = ((Curl_send*)c->send_underlying)(conn, FIRSTSOCKET, + data, length, &result); + + if(result == CURLE_AGAIN) { + return NGHTTP2_ERR_WOULDBLOCK; + } + + if(written == -1) { + failf(conn->data, "Failed sending HTTP2 data"); + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + + if(!written) + return NGHTTP2_ERR_WOULDBLOCK; + + return written; +} + + +/* We pass a pointer to this struct in the push callback, but the contents of + the struct are hidden from the user. */ +struct curl_pushheaders { + struct SessionHandle *data; + const nghttp2_push_promise *frame; +}; + +/* + * push header access function. Only to be used from within the push callback + */ +char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num) +{ + /* Verify that we got a good easy handle in the push header struct, mostly to + detect rubbish input fast(er). */ + if(!h || !GOOD_EASY_HANDLE(h->data)) + return NULL; + else { + struct HTTP *stream = h->data->req.protop; + if(num < stream->push_headers_used) + return stream->push_headers[num]; + } + return NULL; +} + +/* + * push header access function. Only to be used from within the push callback + */ +char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header) +{ + /* Verify that we got a good easy handle in the push header struct, + mostly to detect rubbish input fast(er). Also empty header name + is just a rubbish too. We have to allow ":" at the beginning of + the header, but header == ":" must be rejected. If we have ':' in + the middle of header, it could be matched in middle of the value, + this is because we do prefix match.*/ + if(!h || !GOOD_EASY_HANDLE(h->data) || !header || !header[0] || + Curl_raw_equal(header, ":") || strchr(header + 1, ':')) + return NULL; + else { + struct HTTP *stream = h->data->req.protop; + size_t len = strlen(header); + size_t i; + for(i=0; i<stream->push_headers_used; i++) { + if(!strncmp(header, stream->push_headers[i], len)) { + /* sub-match, make sure that it us followed by a colon */ + if(stream->push_headers[i][len] != ':') + continue; + return &stream->push_headers[i][len+1]; + } + } + } + return NULL; +} + +static CURL *duphandle(struct SessionHandle *data) +{ + struct SessionHandle *second = curl_easy_duphandle(data); + if(second) { + /* setup the request struct */ + struct HTTP *http = calloc(1, sizeof(struct HTTP)); + if(!http) { + (void)Curl_close(second); + second = NULL; + } + else { + second->req.protop = http; + http->header_recvbuf = Curl_add_buffer_init(); + if(!http->header_recvbuf) { + free(http); + (void)Curl_close(second); + second = NULL; + } + else + Curl_http2_setup_req(second); + } + } + return second; +} + + +static int push_promise(struct SessionHandle *data, + struct connectdata *conn, + const nghttp2_push_promise *frame) +{ + int rv; + DEBUGF(infof(data, "PUSH_PROMISE received, stream %u!\n", + frame->promised_stream_id)); + if(data->multi->push_cb) { + struct HTTP *stream; + struct curl_pushheaders heads; + CURLMcode rc; + struct http_conn *httpc; + size_t i; + /* clone the parent */ + CURL *newhandle = duphandle(data); + if(!newhandle) { + infof(data, "failed to duplicate handle\n"); + rv = 1; /* FAIL HARD */ + goto fail; + } + + heads.data = data; + heads.frame = frame; + /* ask the application */ + DEBUGF(infof(data, "Got PUSH_PROMISE, ask application!\n")); + + stream = data->req.protop; + if(!stream) { + failf(data, "Internal NULL stream!\n"); + rv = 1; + goto fail; + } + + rv = data->multi->push_cb(data, newhandle, + stream->push_headers_used, &heads, + data->multi->push_userp); + + /* free the headers again */ + for(i=0; i<stream->push_headers_used; i++) + free(stream->push_headers[i]); + free(stream->push_headers); + stream->push_headers = NULL; + + if(rv) { + /* denied, kill off the new handle again */ + (void)Curl_close(newhandle); + goto fail; + } + + /* approved, add to the multi handle and immediately switch to PERFORM + state with the given connection !*/ + rc = Curl_multi_add_perform(data->multi, newhandle, conn); + if(rc) { + infof(data, "failed to add handle to multi\n"); + Curl_close(newhandle); + rv = 1; + goto fail; + } + + httpc = &conn->proto.httpc; + nghttp2_session_set_stream_user_data(httpc->h2, + frame->promised_stream_id, newhandle); + } + else { + DEBUGF(infof(data, "Got PUSH_PROMISE, ignore it!\n")); + rv = 1; + } + fail: + return rv; +} + +static int on_frame_recv(nghttp2_session *session, const nghttp2_frame *frame, + void *userp) +{ + struct connectdata *conn = NULL; + struct http_conn *httpc = NULL; + struct SessionHandle *data_s = NULL; + struct HTTP *stream = NULL; + static int lastStream = -1; + int rv; + size_t left, ncopy; + int32_t stream_id = frame->hd.stream_id; + + (void)userp; + + if(!stream_id) { + /* stream ID zero is for connection-oriented stuff */ + return 0; + } + data_s = nghttp2_session_get_stream_user_data(session, + frame->hd.stream_id); + if(lastStream != frame->hd.stream_id) { + lastStream = frame->hd.stream_id; + } + if(!data_s) { + DEBUGF(infof(conn->data, + "No SessionHandle associated with stream: %x\n", + stream_id)); + return 0; + } + + stream = data_s->req.protop; + if(!stream) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + DEBUGF(infof(data_s, "on_frame_recv() header %x stream %x\n", + frame->hd.type, stream_id)); + + conn = data_s->easy_conn; + assert(conn); + assert(conn->data == data_s); + httpc = &conn->proto.httpc; + switch(frame->hd.type) { + case NGHTTP2_DATA: + /* If body started on this stream, then receiving DATA is illegal. */ + if(!stream->bodystarted) { + rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, + stream_id, NGHTTP2_PROTOCOL_ERROR); + + if(nghttp2_is_fatal(rv)) { + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + } + break; + case NGHTTP2_HEADERS: + if(frame->headers.cat == NGHTTP2_HCAT_REQUEST) + break; + + if(stream->bodystarted) { + /* Only valid HEADERS after body started is trailer HEADERS. We + ignores trailer HEADERS for now. nghttp2 guarantees that it + has END_STREAM flag set. */ + break; + } + + /* nghttp2 guarantees that :status is received, and we store it to + stream->status_code */ + DEBUGASSERT(stream->status_code != -1); + + /* Only final status code signals the end of header */ + if(stream->status_code / 100 != 1) { + stream->bodystarted = TRUE; + stream->status_code = -1; + } + + Curl_add_buffer(stream->header_recvbuf, "\r\n", 2); + + left = stream->header_recvbuf->size_used - stream->nread_header_recvbuf; + ncopy = MIN(stream->len, left); + + memcpy(&stream->mem[stream->memlen], + stream->header_recvbuf->buffer + stream->nread_header_recvbuf, + ncopy); + stream->nread_header_recvbuf += ncopy; + + DEBUGF(infof(data_s, "Store %zu bytes headers from stream %u at %p\n", + ncopy, stream_id, stream->mem)); + + stream->len -= ncopy; + stream->memlen += ncopy; + + data_s->state.drain++; + Curl_expire(data_s, 1); + break; + case NGHTTP2_PUSH_PROMISE: + rv = push_promise(data_s, conn, &frame->push_promise); + if(rv) { /* deny! */ + rv = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, + frame->push_promise.promised_stream_id, + NGHTTP2_CANCEL); + if(nghttp2_is_fatal(rv)) { + return rv; + } + } + break; + case NGHTTP2_SETTINGS: + { + uint32_t max_conn = httpc->settings.max_concurrent_streams; + DEBUGF(infof(conn->data, "Got SETTINGS for stream %u!\n", stream_id)); + httpc->settings.max_concurrent_streams = + nghttp2_session_get_remote_settings( + session, NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS); + httpc->settings.enable_push = + nghttp2_session_get_remote_settings( + session, NGHTTP2_SETTINGS_ENABLE_PUSH); + DEBUGF(infof(conn->data, "MAX_CONCURRENT_STREAMS == %d\n", + httpc->settings.max_concurrent_streams)); + DEBUGF(infof(conn->data, "ENABLE_PUSH == %s\n", + httpc->settings.enable_push?"TRUE":"false")); + if(max_conn != httpc->settings.max_concurrent_streams) { + /* only signal change if the value actually changed */ + infof(conn->data, + "Connection state changed (MAX_CONCURRENT_STREAMS updated)!\n"); + Curl_multi_connchanged(conn->data->multi); + } + } + break; + default: + DEBUGF(infof(conn->data, "Got frame type %x for stream %u!\n", + frame->hd.type, stream_id)); + break; + } + return 0; +} + +static int on_invalid_frame_recv(nghttp2_session *session, + const nghttp2_frame *frame, + int lib_error_code, void *userp) +{ + struct SessionHandle *data_s = NULL; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(data_s) { + DEBUGF(infof(data_s, + "on_invalid_frame_recv() was called, error=%d:%s\n", + lib_error_code, nghttp2_strerror(lib_error_code))); + } + return 0; +} + +static int on_data_chunk_recv(nghttp2_session *session, uint8_t flags, + int32_t stream_id, + const uint8_t *data, size_t len, void *userp) +{ + struct HTTP *stream; + struct SessionHandle *data_s; + size_t nread; + (void)session; + (void)flags; + (void)data; + (void)userp; + + DEBUGASSERT(stream_id); /* should never be a zero stream ID here */ + + /* get the stream from the hash based on Stream ID */ + data_s = nghttp2_session_get_stream_user_data(session, stream_id); + if(!data_s) + /* Receiving a Stream ID not in the hash should not happen, this is an + internal error more than anything else! */ + return NGHTTP2_ERR_CALLBACK_FAILURE; + + stream = data_s->req.protop; + if(!stream) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + nread = MIN(stream->len, len); + memcpy(&stream->mem[stream->memlen], data, nread); + + stream->len -= nread; + stream->memlen += nread; + + data_s->state.drain++; + Curl_expire(data_s, 1); /* TODO: fix so that this can be set to 0 for + immediately? */ + + DEBUGF(infof(data_s, "%zu data received for stream %u " + "(%zu left in buffer %p, total %zu)\n", + nread, stream_id, + stream->len, stream->mem, + stream->memlen)); + + if(nread < len) { + stream->pausedata = data + nread; + stream->pauselen = len - nread; + DEBUGF(infof(data_s, "NGHTTP2_ERR_PAUSE - %zu bytes out of buffer" + ", stream %u\n", + len - nread, stream_id)); + data_s->easy_conn->proto.httpc.pause_stream_id = stream_id; + return NGHTTP2_ERR_PAUSE; + } + return 0; +} + +static int before_frame_send(nghttp2_session *session, + const nghttp2_frame *frame, + void *userp) +{ + struct SessionHandle *data_s; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(data_s) { + DEBUGF(infof(data_s, "before_frame_send() was called\n")); + } + + return 0; +} +static int on_frame_send(nghttp2_session *session, + const nghttp2_frame *frame, + void *userp) +{ + struct SessionHandle *data_s; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(data_s) { + DEBUGF(infof(data_s, "on_frame_send() was called, length = %zd\n", + frame->hd.length)); + } + return 0; +} +static int on_frame_not_send(nghttp2_session *session, + const nghttp2_frame *frame, + int lib_error_code, void *userp) +{ + struct SessionHandle *data_s; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(data_s) { + DEBUGF(infof(data_s, + "on_frame_not_send() was called, lib_error_code = %d\n", + lib_error_code)); + } + return 0; +} +static int on_stream_close(nghttp2_session *session, int32_t stream_id, + uint32_t error_code, void *userp) +{ + struct SessionHandle *data_s; + struct HTTP *stream; + (void)session; + (void)stream_id; + (void)userp; + + if(stream_id) { + /* get the stream from the hash based on Stream ID, stream ID zero is for + connection-oriented stuff */ + data_s = nghttp2_session_get_stream_user_data(session, stream_id); + if(!data_s) { + /* We could get stream ID not in the hash. For example, if we + decided to reject stream (e.g., PUSH_PROMISE). */ + return 0; + } + DEBUGF(infof(data_s, "on_stream_close(), error_code = %d, stream %u\n", + error_code, stream_id)); + stream = data_s->req.protop; + if(!stream) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + stream->error_code = error_code; + stream->closed = TRUE; + + /* remove the entry from the hash as the stream is now gone */ + nghttp2_session_set_stream_user_data(session, stream_id, 0); + DEBUGF(infof(data_s, "Removed stream %u hash!\n", stream_id)); + } + return 0; +} + +static int on_begin_headers(nghttp2_session *session, + const nghttp2_frame *frame, void *userp) +{ + struct SessionHandle *data_s = NULL; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(data_s) { + DEBUGF(infof(data_s, "on_begin_headers() was called\n")); + } + return 0; +} + +/* Decode HTTP status code. Returns -1 if no valid status code was + decoded. */ +static int decode_status_code(const uint8_t *value, size_t len) +{ + int i; + int res; + + if(len != 3) { + return -1; + } + + res = 0; + + for(i = 0; i < 3; ++i) { + char c = value[i]; + + if(c < '0' || c > '9') { + return -1; + } + + res *= 10; + res += c - '0'; + } + + return res; +} + +/* frame->hd.type is either NGHTTP2_HEADERS or NGHTTP2_PUSH_PROMISE */ +static int on_header(nghttp2_session *session, const nghttp2_frame *frame, + const uint8_t *name, size_t namelen, + const uint8_t *value, size_t valuelen, + uint8_t flags, + void *userp) +{ + struct HTTP *stream; + struct SessionHandle *data_s; + int32_t stream_id = frame->hd.stream_id; + + (void)flags; + (void)userp; + + DEBUGASSERT(stream_id); /* should never be a zero stream ID here */ + + /* get the stream from the hash based on Stream ID */ + data_s = nghttp2_session_get_stream_user_data(session, stream_id); + if(!data_s) + /* Receiving a Stream ID not in the hash should not happen, this is an + internal error more than anything else! */ + return NGHTTP2_ERR_CALLBACK_FAILURE; + + stream = data_s->req.protop; + if(!stream) { + failf(data_s, "Internal NULL stream! 5\n"); + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + + if(stream->bodystarted) + /* Ignore trailer or HEADERS not mapped to HTTP semantics. The + consequence is handled in on_frame_recv(). */ + return 0; + + /* Store received PUSH_PROMISE headers to be used when the subsequent + PUSH_PROMISE callback comes */ + if(frame->hd.type == NGHTTP2_PUSH_PROMISE) { + char *h; + + if(!stream->push_headers) { + stream->push_headers_alloc = 10; + stream->push_headers = malloc(stream->push_headers_alloc * + sizeof(char *)); + stream->push_headers_used = 0; + } + else if(stream->push_headers_used == + stream->push_headers_alloc) { + char **headp; + stream->push_headers_alloc *= 2; + headp = realloc(stream->push_headers, + stream->push_headers_alloc * sizeof(char *)); + if(!headp) { + free(stream->push_headers); + stream->push_headers = NULL; + return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; + } + stream->push_headers = headp; + } + h = aprintf("%s:%s", name, value); + if(h) + stream->push_headers[stream->push_headers_used++] = h; + return 0; + } + + if(namelen == sizeof(":status") - 1 && + memcmp(":status", name, namelen) == 0) { + /* nghttp2 guarantees :status is received first and only once, and + value is 3 digits status code, and decode_status_code always + succeeds. */ + stream->status_code = decode_status_code(value, valuelen); + DEBUGASSERT(stream->status_code != -1); + + Curl_add_buffer(stream->header_recvbuf, "HTTP/2.0 ", 9); + Curl_add_buffer(stream->header_recvbuf, value, valuelen); + Curl_add_buffer(stream->header_recvbuf, "\r\n", 2); + data_s->state.drain++; + Curl_expire(data_s, 1); + + DEBUGF(infof(data_s, "h2 status: HTTP/2 %03d\n", + stream->status_code)); + return 0; + } + + /* nghttp2 guarantees that namelen > 0, and :status was already + received, and this is not pseudo-header field . */ + /* convert to a HTTP1-style header */ + Curl_add_buffer(stream->header_recvbuf, name, namelen); + Curl_add_buffer(stream->header_recvbuf, ":", 1); + Curl_add_buffer(stream->header_recvbuf, value, valuelen); + Curl_add_buffer(stream->header_recvbuf, "\r\n", 2); + data_s->state.drain++; + Curl_expire(data_s, 1); + + DEBUGF(infof(data_s, "h2 header: %.*s: %.*s\n", namelen, name, valuelen, + value)); + + return 0; /* 0 is successful */ +} + +static ssize_t data_source_read_callback(nghttp2_session *session, + int32_t stream_id, + uint8_t *buf, size_t length, + uint32_t *data_flags, + nghttp2_data_source *source, + void *userp) +{ + struct SessionHandle *data_s; + struct HTTP *stream = NULL; + size_t nread; + (void)source; + (void)userp; + + if(stream_id) { + /* get the stream from the hash based on Stream ID, stream ID zero is for + connection-oriented stuff */ + data_s = nghttp2_session_get_stream_user_data(session, stream_id); + if(!data_s) + /* Receiving a Stream ID not in the hash should not happen, this is an + internal error more than anything else! */ + return NGHTTP2_ERR_CALLBACK_FAILURE; + + stream = data_s->req.protop; + if(!stream) + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + else + return NGHTTP2_ERR_INVALID_ARGUMENT; + + nread = MIN(stream->upload_len, length); + if(nread > 0) { + memcpy(buf, stream->upload_mem, nread); + stream->upload_mem += nread; + stream->upload_len -= nread; + stream->upload_left -= nread; + } + + if(stream->upload_left == 0) + *data_flags = 1; + else if(nread == 0) + return NGHTTP2_ERR_DEFERRED; + + DEBUGF(infof(data_s, "data_source_read_callback: " + "returns %zu bytes stream %u\n", + nread, stream_id)); + + return nread; +} + +/* + * The HTTP2 settings we send in the Upgrade request + */ +static nghttp2_settings_entry settings[] = { + { NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100 }, + { NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, NGHTTP2_INITIAL_WINDOW_SIZE }, +}; + +#define H2_BUFSIZE 32768 + +/* + * Initialize nghttp2 for a Curl connection + */ +CURLcode Curl_http2_init(struct connectdata *conn) +{ + if(!conn->proto.httpc.h2) { + int rc; + nghttp2_session_callbacks *callbacks; + + conn->proto.httpc.inbuf = malloc(H2_BUFSIZE); + if(conn->proto.httpc.inbuf == NULL) + return CURLE_OUT_OF_MEMORY; + + rc = nghttp2_session_callbacks_new(&callbacks); + + if(rc) { + failf(conn->data, "Couldn't initialize nghttp2 callbacks!"); + return CURLE_OUT_OF_MEMORY; /* most likely at least */ + } + + /* nghttp2_send_callback */ + nghttp2_session_callbacks_set_send_callback(callbacks, send_callback); + /* nghttp2_on_frame_recv_callback */ + nghttp2_session_callbacks_set_on_frame_recv_callback + (callbacks, on_frame_recv); + /* nghttp2_on_invalid_frame_recv_callback */ + nghttp2_session_callbacks_set_on_invalid_frame_recv_callback + (callbacks, on_invalid_frame_recv); + /* nghttp2_on_data_chunk_recv_callback */ + nghttp2_session_callbacks_set_on_data_chunk_recv_callback + (callbacks, on_data_chunk_recv); + /* nghttp2_before_frame_send_callback */ + nghttp2_session_callbacks_set_before_frame_send_callback + (callbacks, before_frame_send); + /* nghttp2_on_frame_send_callback */ + nghttp2_session_callbacks_set_on_frame_send_callback + (callbacks, on_frame_send); + /* nghttp2_on_frame_not_send_callback */ + nghttp2_session_callbacks_set_on_frame_not_send_callback + (callbacks, on_frame_not_send); + /* nghttp2_on_stream_close_callback */ + nghttp2_session_callbacks_set_on_stream_close_callback + (callbacks, on_stream_close); + /* nghttp2_on_begin_headers_callback */ + nghttp2_session_callbacks_set_on_begin_headers_callback + (callbacks, on_begin_headers); + /* nghttp2_on_header_callback */ + nghttp2_session_callbacks_set_on_header_callback(callbacks, on_header); + + /* The nghttp2 session is not yet setup, do it */ + rc = nghttp2_session_client_new(&conn->proto.httpc.h2, callbacks, conn); + + nghttp2_session_callbacks_del(callbacks); + + if(rc) { + failf(conn->data, "Couldn't initialize nghttp2!"); + return CURLE_OUT_OF_MEMORY; /* most likely at least */ + } + + if(rc) { + failf(conn->data, "Couldn't init stream hash!"); + return CURLE_OUT_OF_MEMORY; /* most likely at least */ + } + } + return CURLE_OK; +} + +/* + * Send a request using http2 + */ +CURLcode Curl_http2_send_request(struct connectdata *conn) +{ + (void)conn; + return CURLE_OK; +} + +/* + * Append headers to ask for a HTTP1.1 to HTTP2 upgrade. + */ +CURLcode Curl_http2_request_upgrade(Curl_send_buffer *req, + struct connectdata *conn) +{ + CURLcode result; + ssize_t binlen; + char *base64; + size_t blen; + struct SingleRequest *k = &conn->data->req; + uint8_t *binsettings = conn->proto.httpc.binsettings; + + /* As long as we have a fixed set of settings, we don't have to dynamically + * figure out the base64 strings since it'll always be the same. However, + * the settings will likely not be fixed every time in the future. + */ + + /* this returns number of bytes it wrote */ + binlen = nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN, + settings, + sizeof(settings)/sizeof(settings[0])); + if(!binlen) { + failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload"); + return CURLE_FAILED_INIT; + } + conn->proto.httpc.binlen = binlen; + + result = Curl_base64url_encode(conn->data, (const char *)binsettings, binlen, + &base64, &blen); + if(result) + return result; + + result = Curl_add_bufferf(req, + "Connection: Upgrade, HTTP2-Settings\r\n" + "Upgrade: %s\r\n" + "HTTP2-Settings: %s\r\n", + NGHTTP2_CLEARTEXT_PROTO_VERSION_ID, base64); + free(base64); + + k->upgr101 = UPGR101_REQUESTED; + + return result; +} + +static ssize_t http2_handle_stream_close(struct http_conn *httpc, + struct SessionHandle *data, + struct HTTP *stream, CURLcode *err) { + if(httpc->pause_stream_id == stream->stream_id) { + httpc->pause_stream_id = 0; + } + /* Reset to FALSE to prevent infinite loop in readwrite_data + function. */ + stream->closed = FALSE; + if(stream->error_code != NGHTTP2_NO_ERROR) { + failf(data, "HTTP/2 stream %u was not closed cleanly: error_code = %d", + stream->stream_id, stream->error_code); + *err = CURLE_HTTP2; + return -1; + } + DEBUGF(infof(data, "http2_recv returns 0, http2_handle_stream_close\n")); + return 0; +} + +/* + * If the read would block (EWOULDBLOCK) we return -1. Otherwise we return + * a regular CURLcode value. + */ +static ssize_t http2_recv(struct connectdata *conn, int sockindex, + char *mem, size_t len, CURLcode *err) +{ + CURLcode result = CURLE_OK; + ssize_t rv; + ssize_t nread; + struct http_conn *httpc = &conn->proto.httpc; + struct SessionHandle *data = conn->data; + struct HTTP *stream = data->req.protop; + + (void)sockindex; /* we always do HTTP2 on sockindex 0 */ + + /* If stream is closed, return 0 to signal the http routine to close + the connection. We need to handle stream closure here, + otherwise, we may be going to read from underlying connection, + and gets EAGAIN, and we will get stuck there. */ + if(stream->memlen == 0 && stream->closed) { + return http2_handle_stream_close(httpc, data, stream, err); + } + + /* Nullify here because we call nghttp2_session_send() and they + might refer to the old buffer. */ + stream->upload_mem = NULL; + stream->upload_len = 0; + + /* + * At this point 'stream' is just in the SessionHandle the connection + * identifies as its owner at this time. + */ + + if(stream->bodystarted && + stream->nread_header_recvbuf < stream->header_recvbuf->size_used) { + /* If there is body data pending for this stream to return, do that */ + size_t left = + stream->header_recvbuf->size_used - stream->nread_header_recvbuf; + size_t ncopy = MIN(len, left); + memcpy(mem, stream->header_recvbuf->buffer + stream->nread_header_recvbuf, + ncopy); + stream->nread_header_recvbuf += ncopy; + + infof(data, "http2_recv: Got %d bytes from header_recvbuf\n", + (int)ncopy); + return ncopy; + } + + infof(data, "http2_recv: %d bytes buffer at %p (stream %u)\n", + len, mem, stream->stream_id); + + if((data->state.drain) && stream->memlen) { + DEBUGF(infof(data, "http2_recv: DRAIN %zu bytes stream %u!! (%p => %p)\n", + stream->memlen, stream->stream_id, + stream->mem, mem)); + if(mem != stream->mem) { + /* if we didn't get the same buffer this time, we must move the data to + the beginning */ + memmove(mem, stream->mem, stream->memlen); + stream->len = len - stream->memlen; + stream->mem = mem; + } + } + else if(stream->pausedata) { + nread = MIN(len, stream->pauselen); + memcpy(mem, stream->pausedata, nread); + + stream->pausedata += nread; + stream->pauselen -= nread; + + infof(data, "%zu data bytes written\n", nread); + if(stream->pauselen == 0) { + DEBUGF(infof(data, "Unpaused by stream %u\n", stream->stream_id)); + assert(httpc->pause_stream_id == stream->stream_id); + httpc->pause_stream_id = 0; + + stream->pausedata = NULL; + stream->pauselen = 0; + } + infof(data, "http2_recv: returns unpaused %zd bytes on stream %u\n", + nread, stream->stream_id); + return nread; + } + else if(httpc->pause_stream_id) { + /* If a stream paused nghttp2_session_mem_recv previously, and has + not processed all data, it still refers to the buffer in + nghttp2_session. If we call nghttp2_session_mem_recv(), we may + overwrite that buffer. To avoid that situation, just return + here with CURLE_AGAIN. This could be busy loop since data in + socket is not read. But it seems that usually streams are + notified with its drain property, and socket is read again + quickly. */ + *err = CURLE_AGAIN; + return -1; + } + else { + char *inbuf; + /* remember where to store incoming data for this stream and how big the + buffer is */ + stream->mem = mem; + stream->len = len; + stream->memlen = 0; + + if(httpc->inbuflen == 0) { + nread = ((Curl_recv *)httpc->recv_underlying)( + conn, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result); + + if(result == CURLE_AGAIN) { + *err = result; + return -1; + } + + if(nread == -1) { + failf(data, "Failed receiving HTTP2 data"); + *err = result; + return 0; + } + + if(nread == 0) { + failf(data, "Unexpected EOF"); + *err = CURLE_RECV_ERROR; + return -1; + } + + DEBUGF(infof(data, "nread=%zd\n", nread)); + + httpc->inbuflen = nread; + inbuf = httpc->inbuf; + } + else { + nread = httpc->inbuflen - httpc->nread_inbuf; + inbuf = httpc->inbuf + httpc->nread_inbuf; + + DEBUGF(infof(data, "Use data left in connection buffer, nread=%zd\n", + nread)); + } + rv = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)inbuf, nread); + + if(nghttp2_is_fatal((int)rv)) { + failf(data, "nghttp2_session_mem_recv() returned %d:%s\n", + rv, nghttp2_strerror((int)rv)); + *err = CURLE_RECV_ERROR; + return 0; + } + DEBUGF(infof(data, "nghttp2_session_mem_recv() returns %zd\n", rv)); + if(nread == rv) { + DEBUGF(infof(data, "All data in connection buffer processed\n")); + httpc->inbuflen = 0; + httpc->nread_inbuf = 0; + } + else { + httpc->nread_inbuf += rv; + DEBUGF(infof(data, "%zu bytes left in connection buffer\n", + httpc->inbuflen - httpc->nread_inbuf)); + } + /* Always send pending frames in nghttp2 session, because + nghttp2_session_mem_recv() may queue new frame */ + rv = nghttp2_session_send(httpc->h2); + if(rv != 0) { + *err = CURLE_SEND_ERROR; + return 0; + } + } + if(stream->memlen) { + ssize_t retlen = stream->memlen; + infof(data, "http2_recv: returns %zd for stream %u\n", + retlen, stream->stream_id); + stream->memlen = 0; + + if(httpc->pause_stream_id == stream->stream_id) { + /* data for this stream is returned now, but this stream caused a pause + already so we need it called again asap */ + DEBUGF(infof(data, "Data returned for PAUSED stream %u\n", + stream->stream_id)); + } + else + data->state.drain = 0; /* this stream is hereby drained */ + + return retlen; + } + /* If stream is closed, return 0 to signal the http routine to close + the connection */ + if(stream->closed) { + return http2_handle_stream_close(httpc, data, stream, err); + } + *err = CURLE_AGAIN; + DEBUGF(infof(data, "http2_recv returns AGAIN for stream %u\n", + stream->stream_id)); + return -1; +} + +/* Index where :authority header field will appear in request header + field list. */ +#define AUTHORITY_DST_IDX 3 + +/* return number of received (decrypted) bytes */ +static ssize_t http2_send(struct connectdata *conn, int sockindex, + const void *mem, size_t len, CURLcode *err) +{ + /* + * BIG TODO: Currently, we send request in this function, but this + * function is also used to send request body. It would be nice to + * add dedicated function for request. + */ + int rv; + struct http_conn *httpc = &conn->proto.httpc; + struct HTTP *stream = conn->data->req.protop; + nghttp2_nv *nva; + size_t nheader; + size_t i; + size_t authority_idx; + char *hdbuf = (char*)mem; + char *end; + nghttp2_data_provider data_prd; + int32_t stream_id; + nghttp2_session *h2 = httpc->h2; + + (void)sockindex; + + DEBUGF(infof(conn->data, "http2_send len=%zu\n", len)); + + if(stream->stream_id != -1) { + /* If stream_id != -1, we have dispatched request HEADERS, and now + are going to send or sending request body in DATA frame */ + stream->upload_mem = mem; + stream->upload_len = len; + nghttp2_session_resume_data(h2, stream->stream_id); + rv = nghttp2_session_send(h2); + if(nghttp2_is_fatal(rv)) { + *err = CURLE_SEND_ERROR; + return -1; + } + len -= stream->upload_len; + + /* Nullify here because we call nghttp2_session_send() and they + might refer to the old buffer. */ + stream->upload_mem = NULL; + stream->upload_len = 0; + + if(stream->upload_left) { + /* we are sure that we have more data to send here. Calling the + following API will make nghttp2_session_want_write() return + nonzero if remote window allows it, which then libcurl checks + socket is writable or not. See http2_perform_getsock(). */ + nghttp2_session_resume_data(h2, stream->stream_id); + } + + DEBUGF(infof(conn->data, "http2_send returns %zu for stream %u\n", len, + stream->stream_id)); + return len; + } + + /* Calculate number of headers contained in [mem, mem + len) */ + /* Here, we assume the curl http code generate *correct* HTTP header + field block */ + nheader = 0; + for(i = 0; i < len; ++i) { + if(hdbuf[i] == 0x0a) { + ++nheader; + } + } + /* We counted additional 2 \n in the first and last line. We need 3 + new headers: :method, :path and :scheme. Therefore we need one + more space. */ + nheader += 1; + nva = malloc(sizeof(nghttp2_nv) * nheader); + if(nva == NULL) { + *err = CURLE_OUT_OF_MEMORY; + return -1; + } + /* Extract :method, :path from request line */ + end = strchr(hdbuf, ' '); + if(!end) + goto fail; + nva[0].name = (unsigned char *)":method"; + nva[0].namelen = (uint16_t)strlen((char *)nva[0].name); + nva[0].value = (unsigned char *)hdbuf; + nva[0].valuelen = (uint16_t)(end - hdbuf); + nva[0].flags = NGHTTP2_NV_FLAG_NONE; + + hdbuf = end + 1; + + end = strchr(hdbuf, ' '); + if(!end) + goto fail; + nva[1].name = (unsigned char *)":path"; + nva[1].namelen = (uint16_t)strlen((char *)nva[1].name); + nva[1].value = (unsigned char *)hdbuf; + nva[1].valuelen = (uint16_t)(end - hdbuf); + nva[1].flags = NGHTTP2_NV_FLAG_NONE; + + nva[2].name = (unsigned char *)":scheme"; + nva[2].namelen = (uint16_t)strlen((char *)nva[2].name); + if(conn->handler->flags & PROTOPT_SSL) + nva[2].value = (unsigned char *)"https"; + else + nva[2].value = (unsigned char *)"http"; + nva[2].valuelen = (uint16_t)strlen((char *)nva[2].value); + nva[2].flags = NGHTTP2_NV_FLAG_NONE; + + hdbuf = strchr(hdbuf, 0x0a); + if(!hdbuf) + goto fail; + ++hdbuf; + + authority_idx = 0; + + for(i = 3; i < nheader; ++i) { + end = strchr(hdbuf, ':'); + if(!end) + goto fail; + if(end - hdbuf == 4 && Curl_raw_nequal("host", hdbuf, 4)) { + authority_idx = i; + nva[i].name = (unsigned char *)":authority"; + nva[i].namelen = (uint16_t)strlen((char *)nva[i].name); + } + else { + nva[i].name = (unsigned char *)hdbuf; + nva[i].namelen = (uint16_t)(end - hdbuf); + } + hdbuf = end + 1; + for(; *hdbuf == ' '; ++hdbuf); + end = strchr(hdbuf, 0x0d); + if(!end) + goto fail; + nva[i].value = (unsigned char *)hdbuf; + nva[i].valuelen = (uint16_t)(end - hdbuf); + nva[i].flags = NGHTTP2_NV_FLAG_NONE; + + hdbuf = end + 2; + /* Inspect Content-Length header field and retrieve the request + entity length so that we can set END_STREAM to the last DATA + frame. */ + if(nva[i].namelen == 14 && + Curl_raw_nequal("content-length", (char*)nva[i].name, 14)) { + size_t j; + stream->upload_left = 0; + for(j = 0; j < nva[i].valuelen; ++j) { + stream->upload_left *= 10; + stream->upload_left += nva[i].value[j] - '0'; + } + DEBUGF(infof(conn->data, + "request content-length=%" + CURL_FORMAT_CURL_OFF_T + "\n", stream->upload_left)); + } + } + + /* :authority must come before non-pseudo header fields */ + if(authority_idx != 0 && authority_idx != AUTHORITY_DST_IDX) { + nghttp2_nv authority = nva[authority_idx]; + for(i = authority_idx; i > AUTHORITY_DST_IDX; --i) { + nva[i] = nva[i - 1]; + } + nva[i] = authority; + } + + switch(conn->data->set.httpreq) { + case HTTPREQ_POST: + case HTTPREQ_POST_FORM: + case HTTPREQ_PUT: + data_prd.read_callback = data_source_read_callback; + data_prd.source.ptr = NULL; + stream_id = nghttp2_submit_request(h2, NULL, nva, nheader, + &data_prd, conn->data); + break; + default: + stream_id = nghttp2_submit_request(h2, NULL, nva, nheader, + NULL, conn->data); + } + + Curl_safefree(nva); + + if(stream_id < 0) { + DEBUGF(infof(conn->data, "http2_send() send error\n")); + *err = CURLE_SEND_ERROR; + return -1; + } + + infof(conn->data, "Using Stream ID: %x (easy handle %p)\n", + stream_id, conn->data); + stream->stream_id = stream_id; + + rv = nghttp2_session_send(h2); + + if(rv != 0) { + *err = CURLE_SEND_ERROR; + return -1; + } + + if(stream->stream_id != -1) { + /* If whole HEADERS frame was sent off to the underlying socket, + the nghttp2 library calls data_source_read_callback. But only + it found that no data available, so it deferred the DATA + transmission. Which means that nghttp2_session_want_write() + returns 0 on http2_perform_getsock(), which results that no + writable socket check is performed. To workaround this, we + issue nghttp2_session_resume_data() here to bring back DATA + transmission from deferred state. */ + nghttp2_session_resume_data(h2, stream->stream_id); + } + + return len; + + fail: + free(nva); + *err = CURLE_SEND_ERROR; + return -1; +} + +CURLcode Curl_http2_setup(struct connectdata *conn) +{ + CURLcode result; + struct http_conn *httpc = &conn->proto.httpc; + struct HTTP *stream = conn->data->req.protop; + + stream->stream_id = -1; + + if(!stream->header_recvbuf) + stream->header_recvbuf = Curl_add_buffer_init(); + + if((conn->handler == &Curl_handler_http2_ssl) || + (conn->handler == &Curl_handler_http2)) + return CURLE_OK; /* already done */ + + if(conn->handler->flags & PROTOPT_SSL) + conn->handler = &Curl_handler_http2_ssl; + else + conn->handler = &Curl_handler_http2; + + result = Curl_http2_init(conn); + if(result) + return result; + + infof(conn->data, "Using HTTP2, server supports multi-use\n"); + stream->upload_left = 0; + stream->upload_mem = NULL; + stream->upload_len = 0; + + httpc->inbuflen = 0; + httpc->nread_inbuf = 0; + + httpc->pause_stream_id = 0; + + conn->bits.multiplex = TRUE; /* at least potentially multiplexed */ + conn->httpversion = 20; + conn->bundle->multiuse = BUNDLE_MULTIPLEX; + + infof(conn->data, "Connection state changed (HTTP/2 confirmed)\n"); + Curl_multi_connchanged(conn->data->multi); + + return CURLE_OK; +} + +CURLcode Curl_http2_switched(struct connectdata *conn, + const char *mem, size_t nread) +{ + CURLcode result; + struct http_conn *httpc = &conn->proto.httpc; + int rv; + ssize_t nproc; + struct SessionHandle *data = conn->data; + struct HTTP *stream = conn->data->req.protop; + + result = Curl_http2_setup(conn); + if(result) + return result; + + httpc->recv_underlying = (recving)conn->recv[FIRSTSOCKET]; + httpc->send_underlying = (sending)conn->send[FIRSTSOCKET]; + conn->recv[FIRSTSOCKET] = http2_recv; + conn->send[FIRSTSOCKET] = http2_send; + + if(conn->data->req.upgr101 == UPGR101_RECEIVED) { + /* stream 1 is opened implicitly on upgrade */ + stream->stream_id = 1; + /* queue SETTINGS frame (again) */ + rv = nghttp2_session_upgrade(httpc->h2, httpc->binsettings, + httpc->binlen, NULL); + if(rv != 0) { + failf(data, "nghttp2_session_upgrade() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } + + nghttp2_session_set_stream_user_data(httpc->h2, + stream->stream_id, + conn->data); + } + else { + /* stream ID is unknown at this point */ + stream->stream_id = -1; + rv = nghttp2_submit_settings(httpc->h2, NGHTTP2_FLAG_NONE, NULL, 0); + if(rv != 0) { + failf(data, "nghttp2_submit_settings() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } + } + + /* we are going to copy mem to httpc->inbuf. This is required since + mem is part of buffer pointed by stream->mem, and callbacks + called by nghttp2_session_mem_recv() will write stream specific + data into stream->mem, overwriting data already there. */ + if(H2_BUFSIZE < nread) { + failf(data, "connection buffer size is too small to store data following " + "HTTP Upgrade response header: buflen=%zu, datalen=%zu", + H2_BUFSIZE, nread); + return CURLE_HTTP2; + } + + infof(conn->data, "Copying HTTP/2 data in stream buffer to connection buffer" + " after upgrade: len=%zu\n", + nread); + + memcpy(httpc->inbuf, mem, nread); + httpc->inbuflen = nread; + + nproc = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)httpc->inbuf, + httpc->inbuflen); + + if(nghttp2_is_fatal((int)nproc)) { + failf(data, "nghttp2_session_mem_recv() failed: %s(%d)", + nghttp2_strerror((int)nproc), (int)nproc); + return CURLE_HTTP2; + } + + DEBUGF(infof(data, "nghttp2_session_mem_recv() returns %zd\n", nproc)); + + if((ssize_t)nread == nproc) { + httpc->inbuflen = 0; + httpc->nread_inbuf = 0; + } + else { + httpc->nread_inbuf += nproc; + } + + /* Try to send some frames since we may read SETTINGS already. */ + rv = nghttp2_session_send(httpc->h2); + + if(rv != 0) { + failf(data, "nghttp2_session_send() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } + + return CURLE_OK; +} + +#else /* !USE_NGHTTP2 */ + +/* Satisfy external references even if http2 is not compiled in. */ + +#define CURL_DISABLE_TYPECHECK +#include <curl/curl.h> + +char *curl_pushheader_bynum(struct curl_pushheaders *h, size_t num) +{ + (void) h; + (void) num; + return NULL; +} + +char *curl_pushheader_byname(struct curl_pushheaders *h, const char *header) +{ + (void) h; + (void) header; + return NULL; +} + +#endif /* USE_NGHTTP2 */ |