diff options
Diffstat (limited to 'Utilities/cmcurl/lib/http2.c')
| -rw-r--r-- | Utilities/cmcurl/lib/http2.c | 2391 |
1 files changed, 2391 insertions, 0 deletions
diff --git a/Utilities/cmcurl/lib/http2.c b/Utilities/cmcurl/lib/http2.c new file mode 100644 index 0000000..0c5f6db --- /dev/null +++ b/Utilities/cmcurl/lib/http2.c @@ -0,0 +1,2391 @@ +/*************************************************************************** + * _ _ ____ _ + * Project ___| | | | _ \| | + * / __| | | | |_) | | + * | (__| |_| | _ <| |___ + * \___|\___/|_| \_\_____| + * + * Copyright (C) 1998 - 2018, 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 https://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 <nghttp2/nghttp2.h> +#include "urldata.h" +#include "http2.h" +#include "http.h" +#include "sendf.h" +#include "select.h" +#include "curl_base64.h" +#include "strcase.h" +#include "multiif.h" +#include "url.h" +#include "connect.h" +#include "strtoofft.h" +#include "strdup.h" +/* The last 3 #include files should be in this order */ +#include "curl_printf.h" +#include "curl_memory.h" +#include "memdebug.h" + +#define H2_BUFSIZE 32768 + +#if (NGHTTP2_VERSION_NUM < 0x010000) +#error too old nghttp2 version, upgrade! +#endif + +#if (NGHTTP2_VERSION_NUM > 0x010800) +#define NGHTTP2_HAS_HTTP2_STRERROR 1 +#endif + +#if (NGHTTP2_VERSION_NUM >= 0x010900) +/* nghttp2_session_callbacks_set_error_callback is present in nghttp2 1.9.0 or + later */ +#define NGHTTP2_HAS_ERROR_CALLBACK 1 +#else +#define nghttp2_session_callbacks_set_error_callback(x,y) +#endif + +#if (NGHTTP2_VERSION_NUM >= 0x010c00) +#define NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE 1 +#endif + +#define HTTP2_HUGE_WINDOW_SIZE (1 << 30) + +#ifdef DEBUG_HTTP2 +#define H2BUGF(x) x +#else +#define H2BUGF(x) do { } WHILE_FALSE +#endif + + +static ssize_t http2_recv(struct connectdata *conn, int sockindex, + char *mem, size_t len, CURLcode *err); +static bool http2_connisdead(struct connectdata *conn); +static int h2_session_send(struct Curl_easy *data, + nghttp2_session *h2); +static int h2_process_pending_input(struct connectdata *conn, + struct http_conn *httpc, + CURLcode *err); + +/* + * Curl_http2_init_state() is called when the easy handle is created and + * allows for HTTP/2 specific init of state. + */ +void Curl_http2_init_state(struct UrlState *state) +{ + state->stream_weight = NGHTTP2_DEFAULT_WEIGHT; +} + +/* + * Curl_http2_init_userset() is called when the easy handle is created and + * allows for HTTP/2 specific user-set fields. + */ +void Curl_http2_init_userset(struct UserDefined *set) +{ + set->stream_weight = NGHTTP2_DEFAULT_WEIGHT; +} + +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; + struct SingleRequest *k = &conn->data->req; + 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]; + + /* in a HTTP/2 connection we can basically always get a frame so we should + always be ready for one */ + bitmap |= GETSOCK_READSOCK(FIRSTSOCKET); + + /* we're still uploading or the HTTP/2 layer wants to send data */ + if(((k->keepon & (KEEP_SEND|KEEP_SEND_PAUSE)) == KEEP_SEND) || + 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); +} + +/* + * http2_stream_free() free HTTP2 stream related data + */ +static void http2_stream_free(struct HTTP *http) +{ + if(http) { + Curl_add_buffer_free(&http->header_recvbuf); + Curl_add_buffer_free(&http->trailer_recvbuf); + 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; + } +} + +/* + * Disconnects *a* connection used for HTTP/2. It might be an old one from the + * connection cache and not the "main" one. Don't touch the easy handle! + */ + +static CURLcode http2_disconnect(struct connectdata *conn, + bool dead_connection) +{ + struct http_conn *c = &conn->proto.httpc; + (void)dead_connection; + + H2BUGF(infof(conn->data, "HTTP/2 DISCONNECT starts now\n")); + + nghttp2_session_del(c->h2); + Curl_safefree(c->inbuf); + + H2BUGF(infof(conn->data, "HTTP/2 DISCONNECT done\n")); + + return CURLE_OK; +} + +/* + * The server may send us data at any point (e.g. PING frames). Therefore, + * we cannot assume that an HTTP/2 socket is dead just because it is readable. + * + * Instead, if it is readable, run Curl_connalive() to peek at the socket + * and distinguish between closed and data. + */ +static bool http2_connisdead(struct connectdata *conn) +{ + int sval; + bool dead = TRUE; + + if(conn->bits.close) + return TRUE; + + sval = SOCKET_READABLE(conn->sock[FIRSTSOCKET], 0); + if(sval == 0) { + /* timeout */ + dead = FALSE; + } + else if(sval & CURL_CSELECT_ERR) { + /* socket is in an error state */ + dead = TRUE; + } + else if(sval & CURL_CSELECT_IN) { + /* readable with no error. could still be closed */ + dead = !Curl_connalive(conn); + if(!dead) { + /* This happens before we've sent off a request and the connection is + not in use by any other transfer, there shouldn't be any data here, + only "protocol frames" */ + CURLcode result; + struct http_conn *httpc = &conn->proto.httpc; + ssize_t nread = -1; + if(httpc->recv_underlying) + /* if called "too early", this pointer isn't setup yet! */ + nread = ((Curl_recv *)httpc->recv_underlying)( + conn, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result); + if(nread != -1) { + infof(conn->data, + "%d bytes stray data read before trying h2 connection\n", + (int)nread); + httpc->nread_inbuf = 0; + httpc->inbuflen = nread; + (void)h2_process_pending_input(conn, httpc, &result); + } + else + /* the read failed so let's say this is dead anyway */ + dead = TRUE; + } + } + + return dead; +} + +static unsigned int http2_conncheck(struct connectdata *check, + unsigned int checks_to_perform) +{ + unsigned int ret_val = CONNRESULT_NONE; + struct http_conn *c = &check->proto.httpc; + int rc; + bool send_frames = false; + + if(checks_to_perform & CONNCHECK_ISDEAD) { + if(http2_connisdead(check)) + ret_val |= CONNRESULT_DEAD; + } + + if(checks_to_perform & CONNCHECK_KEEPALIVE) { + struct curltime now = Curl_now(); + time_t elapsed = Curl_timediff(now, check->keepalive); + + if(elapsed > check->upkeep_interval_ms) { + /* Perform an HTTP/2 PING */ + rc = nghttp2_submit_ping(c->h2, 0, ZERO_NULL); + if(!rc) { + /* Successfully added a PING frame to the session. Need to flag this + so the frame is sent. */ + send_frames = true; + } + else { + failf(check->data, "nghttp2_submit_ping() failed: %s(%d)", + nghttp2_strerror(rc), rc); + } + + check->keepalive = now; + } + } + + if(send_frames) { + rc = nghttp2_session_send(c->h2); + if(rc) + failf(check->data, "nghttp2_session_send() failed: %s(%d)", + nghttp2_strerror(rc), rc); + } + + return ret_val; +} + +/* called from Curl_http_setup_conn */ +void Curl_http2_setup_req(struct Curl_easy *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->closed = FALSE; + http->close_handled = FALSE; + http->mem = data->state.buffer; + http->len = data->set.buffer_size; + 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; + conn->proto.httpc.error_code = NGHTTP2_NO_ERROR; +} + +/* + * 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. + */ +static const struct Curl_handler Curl_handler_http2 = { + "HTTP", /* 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 */ + http2_conncheck, /* connection_check */ + PORT_HTTP, /* defport */ + CURLPROTO_HTTP, /* protocol */ + PROTOPT_STREAM /* flags */ +}; + +static const struct Curl_handler Curl_handler_http2_ssl = { + "HTTPS", /* 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 */ + http2_conncheck, /* connection_check */ + PORT_HTTP, /* defport */ + CURLPROTO_HTTPS, /* protocol */ + PROTOPT_SSL | PROTOPT_STREAM /* 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); +} + +/* HTTP/2 error code to name based on the Error Code Registry. +https://tools.ietf.org/html/rfc7540#page-77 +nghttp2_error_code enums are identical. +*/ +const char *Curl_http2_strerror(uint32_t err) +{ +#ifndef NGHTTP2_HAS_HTTP2_STRERROR + const char *str[] = { + "NO_ERROR", /* 0x0 */ + "PROTOCOL_ERROR", /* 0x1 */ + "INTERNAL_ERROR", /* 0x2 */ + "FLOW_CONTROL_ERROR", /* 0x3 */ + "SETTINGS_TIMEOUT", /* 0x4 */ + "STREAM_CLOSED", /* 0x5 */ + "FRAME_SIZE_ERROR", /* 0x6 */ + "REFUSED_STREAM", /* 0x7 */ + "CANCEL", /* 0x8 */ + "COMPRESSION_ERROR", /* 0x9 */ + "CONNECT_ERROR", /* 0xA */ + "ENHANCE_YOUR_CALM", /* 0xB */ + "INADEQUATE_SECURITY", /* 0xC */ + "HTTP_1_1_REQUIRED" /* 0xD */ + }; + return (err < sizeof(str) / sizeof(str[0])) ? str[err] : "unknown"; +#else + return nghttp2_http2_strerror(err); +#endif +} + +/* + * 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; + + if(!c->send_underlying) + /* called before setup properly! */ + return NGHTTP2_ERR_CALLBACK_FAILURE; + + 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 Curl_easy *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] || + !strcmp(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 is followed by a colon */ + if(stream->push_headers[i][len] != ':') + continue; + return &stream->push_headers[i][len + 1]; + } + } + } + return NULL; +} + +/* + * This specific transfer on this connection has been "drained". + */ +static void drained_transfer(struct Curl_easy *data, + struct http_conn *httpc) +{ + DEBUGASSERT(httpc->drain_total >= data->state.drain); + httpc->drain_total -= data->state.drain; + data->state.drain = 0; +} + +/* + * Mark this transfer to get "drained". + */ +static void drain_this(struct Curl_easy *data, + struct http_conn *httpc) +{ + data->state.drain++; + httpc->drain_total++; + DEBUGASSERT(httpc->drain_total >= data->state.drain); +} + +static struct Curl_easy *duphandle(struct Curl_easy *data) +{ + struct Curl_easy *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); + second->state.stream_weight = data->state.stream_weight; + } + } + } + return second; +} + + +static int push_promise(struct Curl_easy *data, + struct connectdata *conn, + const nghttp2_push_promise *frame) +{ + int rv; + H2BUGF(infof(data, "PUSH_PROMISE received, stream %u!\n", + frame->promised_stream_id)); + if(data->multi->push_cb) { + struct HTTP *stream; + struct HTTP *newstream; + struct curl_pushheaders heads; + CURLMcode rc; + struct http_conn *httpc; + size_t i; + /* clone the parent */ + struct Curl_easy *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 */ + H2BUGF(infof(data, "Got PUSH_PROMISE, ask application!\n")); + + stream = data->req.protop; + if(!stream) { + failf(data, "Internal NULL stream!\n"); + (void)Curl_close(newhandle); + rv = 1; + goto fail; + } + + Curl_set_in_callback(data, true); + rv = data->multi->push_cb(data, newhandle, + stream->push_headers_used, &heads, + data->multi->push_userp); + Curl_set_in_callback(data, false); + + /* 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; + stream->push_headers_used = 0; + + if(rv) { + /* denied, kill off the new handle again */ + http2_stream_free(newhandle->req.protop); + newhandle->req.protop = NULL; + (void)Curl_close(newhandle); + goto fail; + } + + newstream = newhandle->req.protop; + newstream->stream_id = frame->promised_stream_id; + newhandle->req.maxdownload = -1; + newhandle->req.size = -1; + + /* 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"); + http2_stream_free(newhandle->req.protop); + newhandle->req.protop = NULL; + Curl_close(newhandle); + rv = 1; + goto fail; + } + + httpc = &conn->proto.httpc; + rv = nghttp2_session_set_stream_user_data(httpc->h2, + frame->promised_stream_id, + newhandle); + if(rv) { + infof(data, "failed to set user_data for stream %d\n", + frame->promised_stream_id); + DEBUGASSERT(0); + goto fail; + } + } + else { + H2BUGF(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 = (struct connectdata *)userp; + struct http_conn *httpc = &conn->proto.httpc; + struct Curl_easy *data_s = NULL; + struct HTTP *stream = NULL; + int rv; + size_t left, ncopy; + int32_t stream_id = frame->hd.stream_id; + CURLcode result; + + if(!stream_id) { + /* stream ID zero is for connection-oriented stuff */ + if(frame->hd.type == NGHTTP2_SETTINGS) { + uint32_t max_conn = httpc->settings.max_concurrent_streams; + H2BUGF(infof(conn->data, "Got SETTINGS\n")); + 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); + H2BUGF(infof(conn->data, "MAX_CONCURRENT_STREAMS == %d\n", + httpc->settings.max_concurrent_streams)); + H2BUGF(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 == %u)!\n", + httpc->settings.max_concurrent_streams); + Curl_multi_connchanged(conn->data->multi); + } + } + return 0; + } + data_s = nghttp2_session_get_stream_user_data(session, stream_id); + if(!data_s) { + H2BUGF(infof(conn->data, + "No Curl_easy associated with stream: %x\n", + stream_id)); + return 0; + } + + stream = data_s->req.protop; + if(!stream) { + H2BUGF(infof(data_s, "No proto pointer for stream: %x\n", + stream_id)); + return NGHTTP2_ERR_CALLBACK_FAILURE; + } + + H2BUGF(infof(data_s, "on_frame_recv() header %x stream %x\n", + frame->hd.type, stream_id)); + + 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(stream->bodystarted) { + /* Only valid HEADERS after body started is trailer HEADERS. We + buffer them in on_header callback. */ + break; + } + + /* nghttp2 guarantees that :status is received, and we store it to + stream->status_code. Fuzzing has proven this can still be reached + without status code having been set. */ + if(stream->status_code == -1) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + /* Only final status code signals the end of header */ + if(stream->status_code / 100 != 1) { + stream->bodystarted = TRUE; + stream->status_code = -1; + } + + result = Curl_add_buffer(&stream->header_recvbuf, "\r\n", 2); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + left = stream->header_recvbuf->size_used - stream->nread_header_recvbuf; + ncopy = CURLMIN(stream->len, left); + + memcpy(&stream->mem[stream->memlen], + stream->header_recvbuf->buffer + stream->nread_header_recvbuf, + ncopy); + stream->nread_header_recvbuf += ncopy; + + H2BUGF(infof(data_s, "Store %zu bytes headers from stream %u at %p\n", + ncopy, stream_id, stream->mem)); + + stream->len -= ncopy; + stream->memlen += ncopy; + + drain_this(data_s, httpc); + { + /* get the pointer from userp again since it was re-assigned above */ + struct connectdata *conn_s = (struct connectdata *)userp; + + /* if we receive data for another handle, wake that up */ + if(conn_s->data != data_s) + Curl_expire(data_s, 0, EXPIRE_RUN_NOW); + } + 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; + default: + H2BUGF(infof(data_s, "Got frame type %x for stream %u!\n", + frame->hd.type, stream_id)); + break; + } + 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 Curl_easy *data_s; + size_t nread; + struct connectdata *conn = (struct connectdata *)userp; + (void)session; + (void)flags; + (void)data; + + 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 = CURLMIN(stream->len, len); + memcpy(&stream->mem[stream->memlen], data, nread); + + stream->len -= nread; + stream->memlen += nread; + + drain_this(data_s, &conn->proto.httpc); + + /* if we receive data for another handle, wake that up */ + if(conn->data != data_s) + Curl_expire(data_s, 0, EXPIRE_RUN_NOW); + + H2BUGF(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; + H2BUGF(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; + } + + /* pause execution of nghttp2 if we received data for another handle + in order to process them first. */ + if(conn->data != data_s) { + data_s->easy_conn->proto.httpc.pause_stream_id = stream_id; + + return NGHTTP2_ERR_PAUSE; + } + + return 0; +} + +static int on_stream_close(nghttp2_session *session, int32_t stream_id, + uint32_t error_code, void *userp) +{ + struct Curl_easy *data_s; + struct HTTP *stream; + struct connectdata *conn = (struct connectdata *)userp; + int rv; + (void)session; + (void)stream_id; + + if(stream_id) { + struct http_conn *httpc; + /* 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; + } + H2BUGF(infof(data_s, "on_stream_close(), %s (err %d), stream %u\n", + Curl_http2_strerror(error_code), error_code, stream_id)); + stream = data_s->req.protop; + if(!stream) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + stream->closed = TRUE; + httpc = &conn->proto.httpc; + drain_this(data_s, httpc); + httpc->error_code = error_code; + + /* remove the entry from the hash as the stream is now gone */ + rv = nghttp2_session_set_stream_user_data(session, stream_id, 0); + if(rv) { + infof(data_s, "http/2: failed to clear user_data for stream %d!\n", + stream_id); + DEBUGASSERT(0); + } + H2BUGF(infof(data_s, "Removed stream %u hash!\n", stream_id)); + stream->stream_id = 0; /* cleared */ + } + return 0; +} + +static int on_begin_headers(nghttp2_session *session, + const nghttp2_frame *frame, void *userp) +{ + struct HTTP *stream; + struct Curl_easy *data_s = NULL; + (void)userp; + + data_s = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id); + if(!data_s) { + return 0; + } + + H2BUGF(infof(data_s, "on_begin_headers() was called\n")); + + if(frame->hd.type != NGHTTP2_HEADERS) { + return 0; + } + + stream = data_s->req.protop; + if(!stream || !stream->bodystarted) { + return 0; + } + + if(!stream->trailer_recvbuf) { + stream->trailer_recvbuf = Curl_add_buffer_init(); + if(!stream->trailer_recvbuf) { + return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; + } + } + 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 Curl_easy *data_s; + int32_t stream_id = frame->hd.stream_id; + struct connectdata *conn = (struct connectdata *)userp; + CURLcode result; + (void)flags; + + 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; + } + + /* 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 *)); + if(!stream->push_headers) + return NGHTTP2_ERR_TEMPORAL_CALLBACK_FAILURE; + stream->push_headers_used = 0; + } + else if(stream->push_headers_used == + stream->push_headers_alloc) { + char **headp; + stream->push_headers_alloc *= 2; + headp = Curl_saferealloc(stream->push_headers, + stream->push_headers_alloc * sizeof(char *)); + if(!headp) { + 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(stream->bodystarted) { + /* This is trailer fields. */ + /* 4 is for ": " and "\r\n". */ + uint32_t n = (uint32_t)(namelen + valuelen + 4); + + H2BUGF(infof(data_s, "h2 trailer: %.*s: %.*s\n", namelen, name, valuelen, + value)); + + result = Curl_add_buffer(&stream->trailer_recvbuf, &n, sizeof(n)); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->trailer_recvbuf, name, namelen); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->trailer_recvbuf, ": ", 2); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->trailer_recvbuf, value, valuelen); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->trailer_recvbuf, "\r\n\0", 3); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + + 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); + + result = Curl_add_buffer(&stream->header_recvbuf, "HTTP/2 ", 7); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->header_recvbuf, value, valuelen); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + /* the space character after the status code is mandatory */ + result = Curl_add_buffer(&stream->header_recvbuf, " \r\n", 3); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + /* if we receive data for another handle, wake that up */ + if(conn->data != data_s) + Curl_expire(data_s, 0, EXPIRE_RUN_NOW); + + H2BUGF(infof(data_s, "h2 status: HTTP/2 %03d (easy %p)\n", + stream->status_code, data_s)); + 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 */ + result = Curl_add_buffer(&stream->header_recvbuf, name, namelen); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->header_recvbuf, ": ", 2); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->header_recvbuf, value, valuelen); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + result = Curl_add_buffer(&stream->header_recvbuf, "\r\n", 2); + if(result) + return NGHTTP2_ERR_CALLBACK_FAILURE; + /* if we receive data for another handle, wake that up */ + if(conn->data != data_s) + Curl_expire(data_s, 0, EXPIRE_RUN_NOW); + + H2BUGF(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 Curl_easy *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 = CURLMIN(stream->upload_len, length); + if(nread > 0) { + memcpy(buf, stream->upload_mem, nread); + stream->upload_mem += nread; + stream->upload_len -= nread; + if(data_s->state.infilesize != -1) + stream->upload_left -= nread; + } + + if(stream->upload_left == 0) + *data_flags = NGHTTP2_DATA_FLAG_EOF; + else if(nread == 0) + return NGHTTP2_ERR_DEFERRED; + + H2BUGF(infof(data_s, "data_source_read_callback: " + "returns %zu bytes stream %u\n", + nread, stream_id)); + + return nread; +} + +#if defined(NGHTTP2_HAS_ERROR_CALLBACK) && \ + !defined(CURL_DISABLE_VERBOSE_STRINGS) +static int error_callback(nghttp2_session *session, + const char *msg, + size_t len, + void *userp) +{ + struct connectdata *conn = (struct connectdata *)userp; + (void)session; + infof(conn->data, "http2 error: %.*s\n", len, msg); + return 0; +} +#endif + +static void populate_settings(struct connectdata *conn, + struct http_conn *httpc) +{ + nghttp2_settings_entry *iv = httpc->local_settings; + + iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS; + iv[0].value = 100; + + iv[1].settings_id = NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE; + iv[1].value = HTTP2_HUGE_WINDOW_SIZE; + + iv[2].settings_id = NGHTTP2_SETTINGS_ENABLE_PUSH; + iv[2].value = conn->data->multi->push_cb != NULL; + + httpc->local_settings_num = 3; +} + +void Curl_http2_done(struct connectdata *conn, bool premature) +{ + struct Curl_easy *data = conn->data; + struct HTTP *http = data->req.protop; + struct http_conn *httpc = &conn->proto.httpc; + + /* there might be allocated resources done before this got the 'h2' pointer + setup */ + if(http->header_recvbuf) { + Curl_add_buffer_free(&http->header_recvbuf); + Curl_add_buffer_free(&http->trailer_recvbuf); + if(http->push_headers) { + /* if they weren't used and then freed before */ + 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; + } + } + + if(!httpc->h2) /* not HTTP/2 ? */ + return; + + if(data->state.drain) + drained_transfer(data, httpc); + + if(premature) { + /* RST_STREAM */ + if(!nghttp2_submit_rst_stream(httpc->h2, NGHTTP2_FLAG_NONE, + http->stream_id, NGHTTP2_STREAM_CLOSED)) + (void)nghttp2_session_send(httpc->h2); + + if(http->stream_id == httpc->pause_stream_id) { + infof(data, "stopped the pause stream!\n"); + httpc->pause_stream_id = 0; + } + } + /* -1 means unassigned and 0 means cleared */ + if(http->stream_id > 0) { + int rv = nghttp2_session_set_stream_user_data(httpc->h2, + http->stream_id, 0); + if(rv) { + infof(data, "http/2: failed to clear user_data for stream %d!\n", + http->stream_id); + DEBUGASSERT(0); + } + http->stream_id = 0; + } +} + +/* + * 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_data_chunk_recv_callback */ + nghttp2_session_callbacks_set_on_data_chunk_recv_callback + (callbacks, on_data_chunk_recv); + /* 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); + +#ifndef CURL_DISABLE_VERBOSE_STRINGS + nghttp2_session_callbacks_set_error_callback(callbacks, error_callback); +#endif + + /* 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 */ + } + } + 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; + struct http_conn *httpc = &conn->proto.httpc; + + populate_settings(conn, httpc); + + /* this returns number of bytes it wrote */ + binlen = nghttp2_pack_settings_payload(binsettings, H2_BINSETTINGS_LEN, + httpc->local_settings, + httpc->local_settings_num); + if(!binlen) { + failf(conn->data, "nghttp2 unexpectedly failed on pack_settings_payload"); + Curl_add_buffer_free(&req); + return CURLE_FAILED_INIT; + } + conn->proto.httpc.binlen = binlen; + + result = Curl_base64url_encode(conn->data, (const char *)binsettings, binlen, + &base64, &blen); + if(result) { + Curl_add_buffer_free(&req); + 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; +} + +/* + * Returns nonzero if current HTTP/2 session should be closed. + */ +static int should_close_session(struct http_conn *httpc) +{ + return httpc->drain_total == 0 && !nghttp2_session_want_read(httpc->h2) && + !nghttp2_session_want_write(httpc->h2); +} + +/* + * h2_process_pending_input() processes pending input left in + * httpc->inbuf. Then, call h2_session_send() to send pending data. + * This function returns 0 if it succeeds, or -1 and error code will + * be assigned to *err. + */ +static int h2_process_pending_input(struct connectdata *conn, + struct http_conn *httpc, + CURLcode *err) +{ + ssize_t nread; + char *inbuf; + ssize_t rv; + struct Curl_easy *data = conn->data; + + nread = httpc->inbuflen - httpc->nread_inbuf; + inbuf = httpc->inbuf + httpc->nread_inbuf; + + rv = nghttp2_session_mem_recv(httpc->h2, (const uint8_t *)inbuf, nread); + if(rv < 0) { + failf(data, + "h2_process_pending_input: nghttp2_session_mem_recv() returned " + "%zd:%s\n", rv, nghttp2_strerror((int)rv)); + *err = CURLE_RECV_ERROR; + return -1; + } + + if(nread == rv) { + H2BUGF(infof(data, + "h2_process_pending_input: All data in connection buffer " + "processed\n")); + httpc->inbuflen = 0; + httpc->nread_inbuf = 0; + } + else { + httpc->nread_inbuf += rv; + H2BUGF(infof(data, + "h2_process_pending_input: %zu bytes left in connection " + "buffer\n", + httpc->inbuflen - httpc->nread_inbuf)); + } + + rv = h2_session_send(data, httpc->h2); + if(rv != 0) { + *err = CURLE_SEND_ERROR; + return -1; + } + + if(should_close_session(httpc)) { + H2BUGF(infof(data, + "h2_process_pending_input: nothing to do in this session\n")); + if(httpc->error_code) + *err = CURLE_HTTP2; + else { + /* not an error per se, but should still close the connection */ + connclose(conn, "GOAWAY received"); + *err = CURLE_OK; + } + return -1; + } + + return 0; +} + +/* + * Called from transfer.c:done_sending when we stop uploading. + */ +CURLcode Curl_http2_done_sending(struct connectdata *conn) +{ + CURLcode result = CURLE_OK; + + if((conn->handler == &Curl_handler_http2_ssl) || + (conn->handler == &Curl_handler_http2)) { + /* make sure this is only attempted for HTTP/2 transfers */ + + struct HTTP *stream = conn->data->req.protop; + + if(stream->upload_left) { + /* If the stream still thinks there's data left to upload. */ + struct http_conn *httpc = &conn->proto.httpc; + nghttp2_session *h2 = httpc->h2; + + stream->upload_left = 0; /* DONE! */ + + /* resume sending here to trigger the callback to get called again so + that it can signal EOF to nghttp2 */ + (void)nghttp2_session_resume_data(h2, stream->stream_id); + + (void)h2_process_pending_input(conn, httpc, &result); + } + } + return result; +} + +static ssize_t http2_handle_stream_close(struct connectdata *conn, + struct Curl_easy *data, + struct HTTP *stream, CURLcode *err) +{ + char *trailer_pos, *trailer_end; + CURLcode result; + struct http_conn *httpc = &conn->proto.httpc; + + if(httpc->pause_stream_id == stream->stream_id) { + httpc->pause_stream_id = 0; + } + + drained_transfer(data, httpc); + + if(httpc->pause_stream_id == 0) { + if(h2_process_pending_input(conn, httpc, err) != 0) { + return -1; + } + } + + DEBUGASSERT(data->state.drain == 0); + + /* Reset to FALSE to prevent infinite loop in readwrite_data function. */ + stream->closed = FALSE; + if(httpc->error_code == NGHTTP2_REFUSED_STREAM) { + H2BUGF(infof(data, "REFUSED_STREAM (%d), try again on a new connection!\n", + stream->stream_id)); + connclose(conn, "REFUSED_STREAM"); /* don't use this anymore */ + data->state.refused_stream = TRUE; + *err = CURLE_RECV_ERROR; /* trigger Curl_retry_request() later */ + return -1; + } + else if(httpc->error_code != NGHTTP2_NO_ERROR) { + failf(data, "HTTP/2 stream %d was not closed cleanly: %s (err %u)", + stream->stream_id, Curl_http2_strerror(httpc->error_code), + httpc->error_code); + *err = CURLE_HTTP2_STREAM; + return -1; + } + + if(!stream->bodystarted) { + failf(data, "HTTP/2 stream %d was closed cleanly, but before getting " + " all response header fields, treated as error", + stream->stream_id); + *err = CURLE_HTTP2_STREAM; + return -1; + } + + if(stream->trailer_recvbuf && stream->trailer_recvbuf->buffer) { + trailer_pos = stream->trailer_recvbuf->buffer; + trailer_end = trailer_pos + stream->trailer_recvbuf->size_used; + + for(; trailer_pos < trailer_end;) { + uint32_t n; + memcpy(&n, trailer_pos, sizeof(n)); + trailer_pos += sizeof(n); + + result = Curl_client_write(conn, CLIENTWRITE_HEADER, trailer_pos, n); + if(result) { + *err = result; + return -1; + } + + trailer_pos += n + 1; + } + } + + stream->close_handled = TRUE; + + H2BUGF(infof(data, "http2_recv returns 0, http2_handle_stream_close\n")); + return 0; +} + +/* + * h2_pri_spec() fills in the pri_spec struct, used by nghttp2 to send weight + * and dependency to the peer. It also stores the updated values in the state + * struct. + */ + +static void h2_pri_spec(struct Curl_easy *data, + nghttp2_priority_spec *pri_spec) +{ + struct HTTP *depstream = (data->set.stream_depends_on? + data->set.stream_depends_on->req.protop:NULL); + int32_t depstream_id = depstream? depstream->stream_id:0; + nghttp2_priority_spec_init(pri_spec, depstream_id, data->set.stream_weight, + data->set.stream_depends_e); + data->state.stream_weight = data->set.stream_weight; + data->state.stream_depends_e = data->set.stream_depends_e; + data->state.stream_depends_on = data->set.stream_depends_on; +} + +/* + * h2_session_send() checks if there's been an update in the priority / + * dependency settings and if so it submits a PRIORITY frame with the updated + * info. + */ +static int h2_session_send(struct Curl_easy *data, + nghttp2_session *h2) +{ + struct HTTP *stream = data->req.protop; + if((data->set.stream_weight != data->state.stream_weight) || + (data->set.stream_depends_e != data->state.stream_depends_e) || + (data->set.stream_depends_on != data->state.stream_depends_on) ) { + /* send new weight and/or dependency */ + nghttp2_priority_spec pri_spec; + int rv; + + h2_pri_spec(data, &pri_spec); + + H2BUGF(infof(data, "Queuing PRIORITY on stream %u (easy %p)\n", + stream->stream_id, data)); + rv = nghttp2_submit_priority(h2, NGHTTP2_FLAG_NONE, stream->stream_id, + &pri_spec); + if(rv) + return rv; + } + + return nghttp2_session_send(h2); +} + +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 Curl_easy *data = conn->data; + struct HTTP *stream = data->req.protop; + + (void)sockindex; /* we always do HTTP2 on sockindex 0 */ + + if(should_close_session(httpc)) { + H2BUGF(infof(data, + "http2_recv: nothing to do in this session\n")); + *err = CURLE_HTTP2; + return -1; + } + + /* 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 Curl_easy 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 = CURLMIN(len, left); + memcpy(mem, stream->header_recvbuf->buffer + stream->nread_header_recvbuf, + ncopy); + stream->nread_header_recvbuf += ncopy; + + H2BUGF(infof(data, "http2_recv: Got %d bytes from header_recvbuf\n", + (int)ncopy)); + return ncopy; + } + + H2BUGF(infof(data, "http2_recv: easy %p (stream %u)\n", + data, stream->stream_id)); + + if((data->state.drain) && stream->memlen) { + H2BUGF(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; + } + if(httpc->pause_stream_id == stream->stream_id && !stream->pausedata) { + /* We have paused nghttp2, but we have no pause data (see + on_data_chunk_recv). */ + httpc->pause_stream_id = 0; + if(h2_process_pending_input(conn, httpc, &result) != 0) { + *err = result; + return -1; + } + } + } + else if(stream->pausedata) { + DEBUGASSERT(httpc->pause_stream_id == stream->stream_id); + nread = CURLMIN(len, stream->pauselen); + memcpy(mem, stream->pausedata, nread); + + stream->pausedata += nread; + stream->pauselen -= nread; + + infof(data, "%zd data bytes written\n", nread); + if(stream->pauselen == 0) { + H2BUGF(infof(data, "Unpaused by stream %u\n", stream->stream_id)); + DEBUGASSERT(httpc->pause_stream_id == stream->stream_id); + httpc->pause_stream_id = 0; + + stream->pausedata = NULL; + stream->pauselen = 0; + + /* When NGHTTP2_ERR_PAUSE is returned from + data_source_read_callback, we might not process DATA frame + fully. Calling nghttp2_session_mem_recv() again will + continue to process DATA frame, but if there is no incoming + frames, then we have to call it again with 0-length data. + Without this, on_stream_close callback will not be called, + and stream could be hanged. */ + if(h2_process_pending_input(conn, httpc, &result) != 0) { + *err = result; + return -1; + } + } + H2BUGF(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. */ + H2BUGF(infof(data, "stream %x is paused, pause id: %x\n", + stream->stream_id, httpc->pause_stream_id)); + *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(nread == -1) { + if(result != CURLE_AGAIN) + failf(data, "Failed receiving HTTP2 data"); + else if(stream->closed) + /* received when the stream was already closed! */ + return http2_handle_stream_close(conn, data, stream, err); + + *err = result; + return -1; + } + + if(nread == 0) { + H2BUGF(infof(data, "end of stream\n")); + *err = CURLE_OK; + return 0; + } + + H2BUGF(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; + + H2BUGF(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 %zd:%s\n", + rv, nghttp2_strerror((int)rv)); + *err = CURLE_RECV_ERROR; + return -1; + } + H2BUGF(infof(data, "nghttp2_session_mem_recv() returns %zd\n", rv)); + if(nread == rv) { + H2BUGF(infof(data, "All data in connection buffer processed\n")); + httpc->inbuflen = 0; + httpc->nread_inbuf = 0; + } + else { + httpc->nread_inbuf += rv; + H2BUGF(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 = h2_session_send(data, httpc->h2); + if(rv != 0) { + *err = CURLE_SEND_ERROR; + return -1; + } + + if(should_close_session(httpc)) { + H2BUGF(infof(data, "http2_recv: nothing to do in this session\n")); + *err = CURLE_HTTP2; + return -1; + } + } + if(stream->memlen) { + ssize_t retlen = stream->memlen; + H2BUGF(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 */ + H2BUGF(infof(data, "Data returned for PAUSED stream %u\n", + stream->stream_id)); + } + else if(!stream->closed) { + drained_transfer(data, httpc); + } + + 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(conn, data, stream, err); + } + *err = CURLE_AGAIN; + H2BUGF(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 + +#define HEADER_OVERFLOW(x) \ + (x.namelen > (uint16_t)-1 || x.valuelen > (uint16_t)-1 - x.namelen) + +/* + * Check header memory for the token "trailers". + * Parse the tokens as separated by comma and surrounded by whitespace. + * Returns TRUE if found or FALSE if not. + */ +static bool contains_trailers(const char *p, size_t len) +{ + const char *end = p + len; + for(;;) { + for(; p != end && (*p == ' ' || *p == '\t'); ++p) + ; + if(p == end || (size_t)(end - p) < sizeof("trailers") - 1) + return FALSE; + if(strncasecompare("trailers", p, sizeof("trailers") - 1)) { + p += sizeof("trailers") - 1; + for(; p != end && (*p == ' ' || *p == '\t'); ++p) + ; + if(p == end || *p == ',') + return TRUE; + } + /* skip to next token */ + for(; p != end && *p != ','; ++p) + ; + if(p == end) + return FALSE; + ++p; + } +} + +typedef enum { + /* Send header to server */ + HEADERINST_FORWARD, + /* Don't send header to server */ + HEADERINST_IGNORE, + /* Discard header, and replace it with "te: trailers" */ + HEADERINST_TE_TRAILERS +} header_instruction; + +/* Decides how to treat given header field. */ +static header_instruction inspect_header(const char *name, size_t namelen, + const char *value, size_t valuelen) { + switch(namelen) { + case 2: + if(!strncasecompare("te", name, namelen)) + return HEADERINST_FORWARD; + + return contains_trailers(value, valuelen) ? + HEADERINST_TE_TRAILERS : HEADERINST_IGNORE; + case 7: + return strncasecompare("upgrade", name, namelen) ? + HEADERINST_IGNORE : HEADERINST_FORWARD; + case 10: + return (strncasecompare("connection", name, namelen) || + strncasecompare("keep-alive", name, namelen)) ? + HEADERINST_IGNORE : HEADERINST_FORWARD; + case 16: + return strncasecompare("proxy-connection", name, namelen) ? + HEADERINST_IGNORE : HEADERINST_FORWARD; + case 17: + return strncasecompare("transfer-encoding", name, namelen) ? + HEADERINST_IGNORE : HEADERINST_FORWARD; + default: + return HEADERINST_FORWARD; + } +} + +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 = NULL; + size_t nheader; + size_t i; + size_t authority_idx; + char *hdbuf = (char *)mem; + char *end, *line_end; + nghttp2_data_provider data_prd; + int32_t stream_id; + nghttp2_session *h2 = httpc->h2; + nghttp2_priority_spec pri_spec; + + (void)sockindex; + + H2BUGF(infof(conn->data, "http2_send len=%zu\n", len)); + + if(stream->stream_id != -1) { + if(stream->close_handled) { + infof(conn->data, "stream %d closed\n", stream->stream_id); + *err = CURLE_HTTP2_STREAM; + return -1; + } + else if(stream->closed) { + return http2_handle_stream_close(conn, conn->data, stream, err); + } + /* 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 = h2_session_send(conn->data, 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(should_close_session(httpc)) { + H2BUGF(infof(conn->data, "http2_send: nothing to do in this session\n")); + *err = CURLE_HTTP2; + return -1; + } + + 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); + } + + H2BUGF(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 = 1; i < len; ++i) { + if(hdbuf[i] == '\n' && hdbuf[i - 1] == '\r') { + ++nheader; + ++i; + } + } + if(nheader < 2) + goto fail; + + /* We counted additional 2 \r\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 + We do line endings with CRLF so checking for CR is enough */ + line_end = memchr(hdbuf, '\r', len); + if(!line_end) + goto fail; + + /* Method does not contain spaces */ + end = memchr(hdbuf, ' ', line_end - hdbuf); + if(!end || end == hdbuf) + goto fail; + nva[0].name = (unsigned char *)":method"; + nva[0].namelen = strlen((char *)nva[0].name); + nva[0].value = (unsigned char *)hdbuf; + nva[0].valuelen = (size_t)(end - hdbuf); + nva[0].flags = NGHTTP2_NV_FLAG_NONE; + if(HEADER_OVERFLOW(nva[0])) { + failf(conn->data, "Failed sending HTTP request: Header overflow"); + goto fail; + } + + hdbuf = end + 1; + + /* Path may contain spaces so scan backwards */ + end = NULL; + for(i = (size_t)(line_end - hdbuf); i; --i) { + if(hdbuf[i - 1] == ' ') { + end = &hdbuf[i - 1]; + break; + } + } + if(!end || end == hdbuf) + goto fail; + nva[1].name = (unsigned char *)":path"; + nva[1].namelen = strlen((char *)nva[1].name); + nva[1].value = (unsigned char *)hdbuf; + nva[1].valuelen = (size_t)(end - hdbuf); + nva[1].flags = NGHTTP2_NV_FLAG_NONE; + if(HEADER_OVERFLOW(nva[1])) { + failf(conn->data, "Failed sending HTTP request: Header overflow"); + goto fail; + } + + nva[2].name = (unsigned char *)":scheme"; + nva[2].namelen = 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 = strlen((char *)nva[2].value); + nva[2].flags = NGHTTP2_NV_FLAG_NONE; + if(HEADER_OVERFLOW(nva[2])) { + failf(conn->data, "Failed sending HTTP request: Header overflow"); + goto fail; + } + + authority_idx = 0; + i = 3; + while(i < nheader) { + size_t hlen; + + hdbuf = line_end + 2; + + /* check for next CR, but only within the piece of data left in the given + buffer */ + line_end = memchr(hdbuf, '\r', len - (hdbuf - (char *)mem)); + if(!line_end || (line_end == hdbuf)) + goto fail; + + /* header continuation lines are not supported */ + if(*hdbuf == ' ' || *hdbuf == '\t') + goto fail; + + for(end = hdbuf; end < line_end && *end != ':'; ++end) + ; + if(end == hdbuf || end == line_end) + goto fail; + hlen = end - hdbuf; + + if(hlen == 4 && strncasecompare("host", hdbuf, 4)) { + authority_idx = i; + nva[i].name = (unsigned char *)":authority"; + nva[i].namelen = strlen((char *)nva[i].name); + } + else { + nva[i].name = (unsigned char *)hdbuf; + nva[i].namelen = (size_t)(end - hdbuf); + } + hdbuf = end + 1; + while(*hdbuf == ' ' || *hdbuf == '\t') + ++hdbuf; + end = line_end; + + switch(inspect_header((const char *)nva[i].name, nva[i].namelen, hdbuf, + end - hdbuf)) { + case HEADERINST_IGNORE: + /* skip header fields prohibited by HTTP/2 specification. */ + --nheader; + continue; + case HEADERINST_TE_TRAILERS: + nva[i].value = (uint8_t*)"trailers"; + nva[i].valuelen = sizeof("trailers") - 1; + break; + default: + nva[i].value = (unsigned char *)hdbuf; + nva[i].valuelen = (size_t)(end - hdbuf); + } + + nva[i].flags = NGHTTP2_NV_FLAG_NONE; + if(HEADER_OVERFLOW(nva[i])) { + failf(conn->data, "Failed sending HTTP request: Header overflow"); + goto fail; + } + ++i; + } + + /* :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; + } + + /* Warn stream may be rejected if cumulative length of headers is too large. + It appears nghttp2 will not send a header frame larger than 64KB. */ +#define MAX_ACC 60000 /* <64KB to account for some overhead */ + { + size_t acc = 0; + + for(i = 0; i < nheader; ++i) { + acc += nva[i].namelen + nva[i].valuelen; + + H2BUGF(infof(conn->data, "h2 header: %.*s:%.*s\n", + nva[i].namelen, nva[i].name, + nva[i].valuelen, nva[i].value)); + } + + if(acc > MAX_ACC) { + infof(conn->data, "http2_send: Warning: The cumulative length of all " + "headers exceeds %zu bytes and that could cause the " + "stream to be rejected.\n", MAX_ACC); + } + } + + h2_pri_spec(conn->data, &pri_spec); + + switch(conn->data->set.httpreq) { + case HTTPREQ_POST: + case HTTPREQ_POST_FORM: + case HTTPREQ_POST_MIME: + case HTTPREQ_PUT: + if(conn->data->state.infilesize != -1) + stream->upload_left = conn->data->state.infilesize; + else + /* data sending without specifying the data amount up front */ + stream->upload_left = -1; /* unknown, but not zero */ + + data_prd.read_callback = data_source_read_callback; + data_prd.source.ptr = NULL; + stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader, + &data_prd, conn->data); + break; + default: + stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader, + NULL, conn->data); + } + + Curl_safefree(nva); + + if(stream_id < 0) { + H2BUGF(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, (void *)conn->data); + stream->stream_id = stream_id; + + /* this does not call h2_session_send() since there can not have been any + * priority upodate since the nghttp2_submit_request() call above */ + rv = nghttp2_session_send(h2); + + if(rv != 0) { + *err = CURLE_SEND_ERROR; + return -1; + } + + if(should_close_session(httpc)) { + H2BUGF(infof(conn->data, "http2_send: nothing to do in this session\n")); + *err = CURLE_HTTP2; + 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(!stream->header_recvbuf) + return CURLE_OUT_OF_MEMORY; + } + + 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) { + Curl_add_buffer_free(&stream->header_recvbuf); + 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; + httpc->drain_total = 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 Curl_easy *data = conn->data; + struct HTTP *stream = conn->data->req.protop; + + result = Curl_http2_setup(conn); + if(result) + return result; + + httpc->recv_underlying = conn->recv[FIRSTSOCKET]; + httpc->send_underlying = 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; + } + + rv = nghttp2_session_set_stream_user_data(httpc->h2, + stream->stream_id, + data); + if(rv) { + infof(data, "http/2: failed to set user_data for stream %d!\n", + stream->stream_id); + DEBUGASSERT(0); + } + } + else { + populate_settings(conn, httpc); + + /* stream ID is unknown at this point */ + stream->stream_id = -1; + rv = nghttp2_submit_settings(httpc->h2, NGHTTP2_FLAG_NONE, + httpc->local_settings, + httpc->local_settings_num); + if(rv != 0) { + failf(data, "nghttp2_submit_settings() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } + } + +#ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE + rv = nghttp2_session_set_local_window_size(httpc->h2, NGHTTP2_FLAG_NONE, 0, + HTTP2_HUGE_WINDOW_SIZE); + if(rv != 0) { + failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } +#endif + + /* 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); + + if(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; + } + + H2BUGF(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 = h2_session_send(data, httpc->h2); + + if(rv != 0) { + failf(data, "nghttp2_session_send() failed: %s(%d)", + nghttp2_strerror(rv), rv); + return CURLE_HTTP2; + } + + if(should_close_session(httpc)) { + H2BUGF(infof(data, + "nghttp2_session_send(): nothing to do in this session\n")); + return CURLE_HTTP2; + } + + return CURLE_OK; +} + +CURLcode Curl_http2_add_child(struct Curl_easy *parent, + struct Curl_easy *child, + bool exclusive) +{ + if(parent) { + struct Curl_http2_dep **tail; + struct Curl_http2_dep *dep = calloc(1, sizeof(struct Curl_http2_dep)); + if(!dep) + return CURLE_OUT_OF_MEMORY; + dep->data = child; + + if(parent->set.stream_dependents && exclusive) { + struct Curl_http2_dep *node = parent->set.stream_dependents; + while(node) { + node->data->set.stream_depends_on = child; + node = node->next; + } + + tail = &child->set.stream_dependents; + while(*tail) + tail = &(*tail)->next; + + DEBUGASSERT(!*tail); + *tail = parent->set.stream_dependents; + parent->set.stream_dependents = 0; + } + + tail = &parent->set.stream_dependents; + while(*tail) { + (*tail)->data->set.stream_depends_e = FALSE; + tail = &(*tail)->next; + } + + DEBUGASSERT(!*tail); + *tail = dep; + } + + child->set.stream_depends_on = parent; + child->set.stream_depends_e = exclusive; + return CURLE_OK; +} + +void Curl_http2_remove_child(struct Curl_easy *parent, struct Curl_easy *child) +{ + struct Curl_http2_dep *last = 0; + struct Curl_http2_dep *data = parent->set.stream_dependents; + DEBUGASSERT(child->set.stream_depends_on == parent); + + while(data && data->data != child) { + last = data; + data = data->next; + } + + DEBUGASSERT(data); + + if(data) { + if(last) { + last->next = data->next; + } + else { + parent->set.stream_dependents = data->next; + } + free(data); + } + + child->set.stream_depends_on = 0; + child->set.stream_depends_e = FALSE; +} + +void Curl_http2_cleanup_dependencies(struct Curl_easy *data) +{ + while(data->set.stream_dependents) { + struct Curl_easy *tmp = data->set.stream_dependents->data; + Curl_http2_remove_child(data, tmp); + if(data->set.stream_depends_on) + Curl_http2_add_child(data->set.stream_depends_on, tmp, FALSE); + } + + if(data->set.stream_depends_on) + Curl_http2_remove_child(data->set.stream_depends_on, data); +} + +#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 */ |