/*************************************************************************** * _ _ ____ _ * Project ___| | | | _ \| | * / __| | | | |_) | | * | (__| |_| | _ <| |___ * \___|\___/|_| \_\_____| * * Copyright (C) 1998 - 2021, Daniel Stenberg, , 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.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 #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" #include "dynbuf.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 < 0x010c00) #error too old nghttp2 version, upgrade! #endif #ifdef CURL_DISABLE_VERBOSE_STRINGS #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 (32 * 1024 * 1024) /* 32 MB */ #ifdef DEBUG_HTTP2 #define H2BUGF(x) x #else #define H2BUGF(x) do { } while(0) #endif static ssize_t http2_recv(struct Curl_easy *data, int sockindex, char *mem, size_t len, CURLcode *err); static bool http2_connisdead(struct Curl_easy *data, struct connectdata *conn); static int h2_session_send(struct Curl_easy *data, nghttp2_session *h2); static int h2_process_pending_input(struct Curl_easy *data, 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_getsock(struct Curl_easy *data, struct connectdata *conn, curl_socket_t *sock) { const struct http_conn *c = &conn->proto.httpc; struct SingleRequest *k = &data->req; int bitmap = GETSOCK_BLANK; sock[0] = conn->sock[FIRSTSOCKET]; if(!(k->keepon & KEEP_RECV_PAUSE)) /* Unless paused - 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; } /* * http2_stream_free() free HTTP2 stream related data */ static void http2_stream_free(struct HTTP *http) { if(http) { Curl_dyn_free(&http->header_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 Curl_easy *data, struct connectdata *conn, bool dead_connection) { struct http_conn *c = &conn->proto.httpc; (void)dead_connection; #ifndef DEBUG_HTTP2 (void)data; #endif H2BUGF(infof(data, "HTTP/2 DISCONNECT starts now\n")); nghttp2_session_del(c->h2); Curl_safefree(c->inbuf); H2BUGF(infof(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 Curl_easy *data, 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)( data, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, &result); if(nread != -1) { infof(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(data, httpc, &result); } else /* the read failed so let's say this is dead anyway */ dead = TRUE; } } return dead; } /* * Set the transfer that is currently using this HTTP/2 connection. */ static void set_transfer(struct http_conn *c, struct Curl_easy *data) { c->trnsfr = data; } /* * Get the transfer that is currently using this HTTP/2 connection. */ static struct Curl_easy *get_transfer(struct http_conn *c) { DEBUGASSERT(c && c->trnsfr); return c->trnsfr; } static unsigned int http2_conncheck(struct Curl_easy *data, struct connectdata *conn, unsigned int checks_to_perform) { unsigned int ret_val = CONNRESULT_NONE; struct http_conn *c = &conn->proto.httpc; int rc; bool send_frames = false; if(checks_to_perform & CONNCHECK_ISDEAD) { if(http2_connisdead(data, conn)) ret_val |= CONNRESULT_DEAD; } if(checks_to_perform & CONNCHECK_KEEPALIVE) { struct curltime now = Curl_now(); timediff_t elapsed = Curl_timediff(now, conn->keepalive); if(elapsed > data->set.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(data, "nghttp2_submit_ping() failed: %s(%d)", nghttp2_strerror(rc), rc); } conn->keepalive = now; } } if(send_frames) { set_transfer(c, data); /* set the transfer */ rc = nghttp2_session_send(c->h2); if(rc) failf(data, "nghttp2_session_send() failed: %s(%d)", nghttp2_strerror(rc), rc); } return ret_val; } /* called from http_setup_conn */ void Curl_http2_setup_req(struct Curl_easy *data) { struct HTTP *http = data->req.p.http; http->bodystarted = FALSE; http->status_code = -1; http->pausedata = NULL; http->pauselen = 0; http->closed = FALSE; http->close_handled = FALSE; http->mem = NULL; http->len = 0; http->memlen = 0; http->error = NGHTTP2_NO_ERROR; } /* called from 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. */ 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_getsock, /* perform_getsock */ http2_disconnect, /* disconnect */ ZERO_NULL, /* readwrite */ http2_conncheck, /* connection_check */ ZERO_NULL, /* attach connection */ PORT_HTTP, /* defport */ CURLPROTO_HTTP, /* protocol */ CURLPROTO_HTTP, /* family */ 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_getsock, /* perform_getsock */ http2_disconnect, /* disconnect */ ZERO_NULL, /* readwrite */ http2_conncheck, /* connection_check */ ZERO_NULL, /* attach connection */ PORT_HTTP, /* defport */ CURLPROTO_HTTPS, /* protocol */ CURLPROTO_HTTP, /* family */ 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 msnprintf(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 *mem, size_t length, int flags, void *userp) { struct connectdata *conn = (struct connectdata *)userp; struct http_conn *c = &conn->proto.httpc; struct Curl_easy *data = get_transfer(c); 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)(data, FIRSTSOCKET, mem, length, &result); if(result == CURLE_AGAIN) { return NGHTTP2_ERR_WOULDBLOCK; } if(written == -1) { failf(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.p.http; 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.p.http; size_t len = strlen(header); size_t i; for(i = 0; ipush_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); } else { second->req.p.http = http; Curl_dyn_init(&http->header_recvbuf, DYN_H2_HEADERS); Curl_http2_setup_req(second); second->state.stream_weight = data->state.stream_weight; } } return second; } static int set_transfer_url(struct Curl_easy *data, struct curl_pushheaders *hp) { const char *v; CURLU *u = curl_url(); CURLUcode uc; char *url = NULL; int rc = 0; v = curl_pushheader_byname(hp, ":scheme"); if(v) { uc = curl_url_set(u, CURLUPART_SCHEME, v, 0); if(uc) { rc = 1; goto fail; } } v = curl_pushheader_byname(hp, ":authority"); if(v) { uc = curl_url_set(u, CURLUPART_HOST, v, 0); if(uc) { rc = 2; goto fail; } } v = curl_pushheader_byname(hp, ":path"); if(v) { uc = curl_url_set(u, CURLUPART_PATH, v, 0); if(uc) { rc = 3; goto fail; } } uc = curl_url_get(u, CURLUPART_URL, &url, 0); if(uc) rc = 4; fail: curl_url_cleanup(u); if(rc) return rc; if(data->state.url_alloc) free(data->state.url); data->state.url_alloc = TRUE; data->state.url = url; return 0; } static int push_promise(struct Curl_easy *data, struct connectdata *conn, const nghttp2_push_promise *frame) { int rv; /* one of the CURL_PUSH_* defines */ 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 = CURL_PUSH_DENY; /* 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.p.http; if(!stream) { failf(data, "Internal NULL stream!"); (void)Curl_close(&newhandle); rv = CURL_PUSH_DENY; goto fail; } rv = set_transfer_url(newhandle, &heads); if(rv) { (void)Curl_close(&newhandle); rv = CURL_PUSH_DENY; 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; ipush_headers_used; i++) free(stream->push_headers[i]); free(stream->push_headers); stream->push_headers = NULL; stream->push_headers_used = 0; if(rv) { DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT)); /* denied, kill off the new handle again */ http2_stream_free(newhandle->req.p.http); newhandle->req.p.http = NULL; (void)Curl_close(&newhandle); goto fail; } newstream = newhandle->req.p.http; 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.p.http); newhandle->req.p.http = NULL; Curl_close(&newhandle); rv = CURL_PUSH_DENY; 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); rv = CURL_PUSH_DENY; goto fail; } } else { H2BUGF(infof(data, "Got PUSH_PROMISE, ignore it!\n")); rv = CURL_PUSH_DENY; } fail: return rv; } /* * multi_connchanged() is called to tell that there is a connection in * this multi handle that has changed state (multiplexing become possible, the * number of allowed streams changed or similar), and a subsequent use of this * multi handle should move CONNECT_PEND handles back to CONNECT to have them * retry. */ static void multi_connchanged(struct Curl_multi *multi) { multi->recheckstate = TRUE; } 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; struct Curl_easy *data = get_transfer(httpc); 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(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(data, "MAX_CONCURRENT_STREAMS == %d\n", httpc->settings.max_concurrent_streams)); H2BUGF(infof(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(data, "Connection state changed (MAX_CONCURRENT_STREAMS == %u)!\n", httpc->settings.max_concurrent_streams); multi_connchanged(data->multi); } } return 0; } data_s = nghttp2_session_get_stream_user_data(session, stream_id); if(!data_s) { H2BUGF(infof(data, "No Curl_easy associated with stream: %x\n", stream_id)); return 0; } stream = data_s->req.p.http; 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_dyn_add(&stream->header_recvbuf, "\r\n"); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; left = Curl_dyn_len(&stream->header_recvbuf) - stream->nread_header_recvbuf; ncopy = CURLMIN(stream->len, left); memcpy(&stream->mem[stream->memlen], Curl_dyn_ptr(&stream->header_recvbuf) + 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); /* if we receive data for another handle, wake that up */ if(get_transfer(httpc) != 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! */ int h2; DEBUGASSERT((rv > CURL_PUSH_OK) && (rv <= CURL_PUSH_ERROROUT)); h2 = nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, frame->push_promise.promised_stream_id, NGHTTP2_CANCEL); if(nghttp2_is_fatal(h2)) return NGHTTP2_ERR_CALLBACK_FAILURE; else if(rv == CURL_PUSH_ERROROUT) { DEBUGF(infof(data_s, "Fail the parent stream (too)\n")); return NGHTTP2_ERR_CALLBACK_FAILURE; } } 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 *mem, size_t len, void *userp) { struct HTTP *stream; struct Curl_easy *data_s; size_t nread; struct connectdata *conn = (struct connectdata *)userp; struct http_conn *httpc = &conn->proto.httpc; (void)session; (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.p.http; if(!stream) return NGHTTP2_ERR_CALLBACK_FAILURE; nread = CURLMIN(stream->len, len); memcpy(&stream->mem[stream->memlen], mem, 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(get_transfer(httpc) != 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 = mem + 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->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(get_transfer(httpc) != data_s) { data_s->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", nghttp2_http2_strerror(error_code), error_code, stream_id)); stream = data_s->req.p.http; if(!stream) return NGHTTP2_ERR_CALLBACK_FAILURE; stream->closed = TRUE; httpc = &conn->proto.httpc; drain_this(data_s, httpc); Curl_expire(data_s, 0, EXPIRE_RUN_NOW); stream->error = 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); } if(stream_id == httpc->pause_stream_id) { H2BUGF(infof(data_s, "Stopped the pause stream!\n")); httpc->pause_stream_id = 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.p.http; if(!stream || !stream->bodystarted) { return 0; } 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; struct http_conn *httpc = &conn->proto.httpc; 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.p.http; if(!stream) { failf(data_s, "Internal NULL stream!"); 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(!strcmp(":authority", (const char *)name)) { /* pseudo headers are lower case */ int rc = 0; char *check = aprintf("%s:%d", conn->host.name, conn->remote_port); if(!check) /* no memory */ return NGHTTP2_ERR_CALLBACK_FAILURE; if(!Curl_strcasecompare(check, (const char *)value) && ((conn->remote_port != conn->given->defport) || !Curl_strcasecompare(conn->host.name, (const char *)value))) { /* This is push is not for the same authority that was asked for in * the URL. RFC 7540 section 8.2 says: "A client MUST treat a * PUSH_PROMISE for which the server is not authoritative as a stream * error of type PROTOCOL_ERROR." */ (void)nghttp2_submit_rst_stream(session, NGHTTP2_FLAG_NONE, stream_id, NGHTTP2_PROTOCOL_ERROR); rc = NGHTTP2_ERR_CALLBACK_FAILURE; } free(check); if(rc) return rc; } 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 a trailer */ H2BUGF(infof(data_s, "h2 trailer: %.*s: %.*s\n", namelen, name, valuelen, value)); result = Curl_dyn_addf(&stream->trailer_recvbuf, "%.*s: %.*s\r\n", namelen, name, valuelen, value); 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_dyn_add(&stream->header_recvbuf, "HTTP/2 "); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; /* the space character after the status code is mandatory */ result = Curl_dyn_add(&stream->header_recvbuf, " \r\n"); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; /* if we receive data for another handle, wake that up */ if(get_transfer(httpc) != 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_dyn_addn(&stream->header_recvbuf, name, namelen); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; result = Curl_dyn_add(&stream->header_recvbuf, ": "); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; result = Curl_dyn_addn(&stream->header_recvbuf, value, valuelen); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; result = Curl_dyn_add(&stream->header_recvbuf, "\r\n"); if(result) return NGHTTP2_ERR_CALLBACK_FAILURE; /* if we receive data for another handle, wake that up */ if(get_transfer(httpc) != 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.p.http; 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(CURL_DISABLE_VERBOSE_STRINGS) static int error_callback(nghttp2_session *session, const char *msg, size_t len, void *userp) { (void)session; (void)msg; (void)len; (void)userp; return 0; } #endif static void populate_settings(struct Curl_easy *data, struct http_conn *httpc) { nghttp2_settings_entry *iv = httpc->local_settings; iv[0].settings_id = NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS; iv[0].value = Curl_multi_max_concurrent_streams(data->multi); 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 = data->multi->push_cb != NULL; httpc->local_settings_num = 3; } void Curl_http2_done(struct Curl_easy *data, bool premature) { struct HTTP *http = data->req.p.http; struct http_conn *httpc = &data->conn->proto.httpc; /* there might be allocated resources done before this got the 'h2' pointer setup */ Curl_dyn_free(&http->header_recvbuf); Curl_dyn_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(!(data->conn->handler->protocol&PROTO_FAMILY_HTTP) || !httpc->h2) /* not HTTP/2 ? */ return; if(premature) { /* RST_STREAM */ set_transfer(httpc, data); /* set the transfer */ 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; } } if(data->state.drain) drained_transfer(data, httpc); /* -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); } set_transfer(httpc, NULL); http->stream_id = 0; } } /* * Initialize nghttp2 for a Curl connection */ static CURLcode http2_init(struct Curl_easy *data, 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) return CURLE_OUT_OF_MEMORY; rc = nghttp2_session_callbacks_new(&callbacks); if(rc) { failf(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); nghttp2_session_callbacks_set_error_callback(callbacks, error_callback); /* 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(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(struct dynbuf *req, struct Curl_easy *data) { CURLcode result; ssize_t binlen; char *base64; size_t blen; struct connectdata *conn = data->conn; struct SingleRequest *k = &data->req; uint8_t *binsettings = conn->proto.httpc.binsettings; struct http_conn *httpc = &conn->proto.httpc; populate_settings(data, 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 <= 0) { failf(data, "nghttp2 unexpectedly failed on pack_settings_payload"); Curl_dyn_free(req); return CURLE_FAILED_INIT; } conn->proto.httpc.binlen = binlen; result = Curl_base64url_encode(data, (const char *)binsettings, binlen, &base64, &blen); if(result) { Curl_dyn_free(req); return result; } result = Curl_dyn_addf(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 Curl_easy *data, struct http_conn *httpc, CURLcode *err) { ssize_t nread; char *inbuf; ssize_t rv; nread = httpc->inbuflen - httpc->nread_inbuf; inbuf = httpc->inbuf + httpc->nread_inbuf; set_transfer(httpc, data); /* set the transfer */ 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", 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) { *err = CURLE_SEND_ERROR; return -1; } if(nghttp2_session_check_request_allowed(httpc->h2) == 0) { /* No more requests are allowed in the current session, so the connection may not be reused. This is set when a GOAWAY frame has been received or when the limit of stream identifiers has been reached. */ connclose(data->conn, "http/2: No new requests allowed"); } if(should_close_session(httpc)) { struct HTTP *stream = data->req.p.http; H2BUGF(infof(data, "h2_process_pending_input: nothing to do in this session\n")); if(stream->error) *err = CURLE_HTTP2; else { /* not an error per se, but should still close the connection */ connclose(data->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 Curl_easy *data, 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 = data->req.p.http; struct http_conn *httpc = &conn->proto.httpc; nghttp2_session *h2 = httpc->h2; if(stream->upload_left) { /* If the stream still thinks there's data left to upload. */ 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(data, httpc, &result); } /* If nghttp2 still has pending frames unsent */ if(nghttp2_session_want_write(h2)) { struct SingleRequest *k = &data->req; int rv; H2BUGF(infof(data, "HTTP/2 still wants to send data (easy %p)\n", data)); /* and attempt to send the pending frames */ rv = h2_session_send(data, h2); if(rv) result = CURLE_SEND_ERROR; if(nghttp2_session_want_write(h2)) { /* re-set KEEP_SEND to make sure we are called again */ k->keepon |= KEEP_SEND; } } } return result; } static ssize_t http2_handle_stream_close(struct connectdata *conn, struct Curl_easy *data, struct HTTP *stream, CURLcode *err) { 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(data, 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(stream->error == 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(stream->error != NGHTTP2_NO_ERROR) { failf(data, "HTTP/2 stream %d was not closed cleanly: %s (err %u)", stream->stream_id, nghttp2_http2_strerror(stream->error), stream->error); *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(Curl_dyn_len(&stream->trailer_recvbuf)) { char *trailp = Curl_dyn_ptr(&stream->trailer_recvbuf); char *lf; do { size_t len = 0; CURLcode result; /* each trailer line ends with a newline */ lf = strchr(trailp, '\n'); if(!lf) break; len = lf + 1 - trailp; Curl_debug(data, CURLINFO_HEADER_IN, trailp, len); /* pass the trailers one by one to the callback */ result = Curl_client_write(data, CLIENTWRITE_HEADER, trailp, len); if(result) { *err = result; return -1; } trailp = ++lf; } while(lf); } 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.p.http: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.p.http; struct http_conn *httpc = &data->conn->proto.httpc; set_transfer(httpc, data); 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)); DEBUGASSERT(stream->stream_id != -1); 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 Curl_easy *data, int sockindex, char *mem, size_t len, CURLcode *err) { ssize_t nread; struct connectdata *conn = data->conn; struct http_conn *httpc = &conn->proto.httpc; struct HTTP *stream = data->req.p.http; (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")); if(conn->bits.close) { /* already marked for closure, return OK and we're done */ *err = CURLE_OK; return 0; } *err = CURLE_HTTP2; return -1; } if(stream->closed) /* closed overrides paused */ return http2_handle_stream_close(conn, 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 Curl_easy the connection * identifies as its owner at this time. */ if(stream->bodystarted && stream->nread_header_recvbuf < Curl_dyn_len(&stream->header_recvbuf)) { /* If there is header data pending for this stream to return, do that */ size_t left = Curl_dyn_len(&stream->header_recvbuf) - stream->nread_header_recvbuf; size_t ncopy = CURLMIN(len, left); memcpy(mem, Curl_dyn_ptr(&stream->header_recvbuf) + 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) win %u/%u\n", data, stream->stream_id, nghttp2_session_get_local_window_size(httpc->h2), nghttp2_session_get_stream_local_window_size(httpc->h2, 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(data, httpc, err) != 0) { 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; 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(data, httpc, err) != 0) { 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. */ if(stream->closed) /* closed overrides paused */ return 0; H2BUGF(infof(data, "stream %x is paused, pause id: %x\n", stream->stream_id, httpc->pause_stream_id)); *err = CURLE_AGAIN; return -1; } else { /* 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)( data, FIRSTSOCKET, httpc->inbuf, H2_BUFSIZE, err); if(nread == -1) { if(*err != 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); return -1; } if(nread == 0) { if(!stream->closed) { /* This will happen when the server or proxy server is SIGKILLed during data transfer. We should emit an error since our data received may be incomplete. */ failf(data, "HTTP/2 stream %d was not closed cleanly before" " end of the underlying stream", stream->stream_id); *err = CURLE_HTTP2_STREAM; return -1; } H2BUGF(infof(data, "end of stream\n")); *err = CURLE_OK; return 0; } H2BUGF(infof(data, "nread=%zd\n", nread)); httpc->inbuflen = nread; DEBUGASSERT(httpc->nread_inbuf == 0); } else { nread = httpc->inbuflen - httpc->nread_inbuf; (void)nread; /* silence warning, used in debug */ H2BUGF(infof(data, "Use data left in connection buffer, nread=%zd\n", nread)); } if(h2_process_pending_input(data, httpc, err)) 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); } else /* this stream is closed, trigger a another read ASAP to detect that */ Curl_expire(data, 0, EXPIRE_RUN_NOW); return retlen; } 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 /* USHRT_MAX is 65535 == 0xffff */ #define HEADER_OVERFLOW(x) \ (x.namelen > 0xffff || x.valuelen > 0xffff - 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 Curl_easy *data, int sockindex, const void *mem, size_t len, CURLcode *err) { /* * 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 connectdata *conn = data->conn; struct http_conn *httpc = &conn->proto.httpc; struct HTTP *stream = data->req.p.http; 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(data, "http2_send len=%zu\n", len)); if(stream->stream_id != -1) { if(stream->close_handled) { infof(data, "stream %d closed\n", stream->stream_id); *err = CURLE_HTTP2_STREAM; return -1; } else if(stream->closed) { return http2_handle_stream_close(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; rv = nghttp2_session_resume_data(h2, stream->stream_id); if(nghttp2_is_fatal(rv)) { *err = CURLE_SEND_ERROR; return -1; } rv = h2_session_send(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(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(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) { *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(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(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(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].namelen = (size_t)(end - hdbuf); /* Lower case the header name for HTTP/2 */ Curl_strntolower((char *)hdbuf, hdbuf, nva[i].namelen); nva[i].name = (unsigned char *)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(data, "Failed sending HTTP request: Header overflow"); goto fail; } ++i; } /* :authority must come before non-pseudo header fields */ if(authority_idx && 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(data, "h2 header: %.*s:%.*s\n", nva[i].namelen, nva[i].name, nva[i].valuelen, nva[i].value)); } if(acc > MAX_ACC) { infof(data, "http2_send: Warning: The cumulative length of all " "headers exceeds %d bytes and that could cause the " "stream to be rejected.\n", MAX_ACC); } } h2_pri_spec(data, &pri_spec); H2BUGF(infof(data, "http2_send request allowed %d (easy handle %p)\n", nghttp2_session_check_request_allowed(h2), (void *)data)); switch(data->state.httpreq) { case HTTPREQ_POST: case HTTPREQ_POST_FORM: case HTTPREQ_POST_MIME: case HTTPREQ_PUT: if(data->state.infilesize != -1) stream->upload_left = 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, data); break; default: stream_id = nghttp2_submit_request(h2, &pri_spec, nva, nheader, NULL, data); } Curl_safefree(nva); if(stream_id < 0) { H2BUGF(infof(data, "http2_send() nghttp2_submit_request error (%s)%d\n", nghttp2_strerror(stream_id), stream_id)); *err = CURLE_SEND_ERROR; return -1; } infof(data, "Using Stream ID: %x (easy handle %p)\n", stream_id, (void *)data); stream->stream_id = stream_id; rv = h2_session_send(data, h2); if(rv) { H2BUGF(infof(data, "http2_send() nghttp2_session_send error (%s)%d\n", nghttp2_strerror(rv), rv)); *err = CURLE_SEND_ERROR; return -1; } if(should_close_session(httpc)) { H2BUGF(infof(data, "http2_send: nothing to do in this session\n")); *err = CURLE_HTTP2; return -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 Curl_easy *data, struct connectdata *conn) { CURLcode result; struct http_conn *httpc = &conn->proto.httpc; struct HTTP *stream = data->req.p.http; DEBUGASSERT(data->state.buffer); stream->stream_id = -1; Curl_dyn_init(&stream->header_recvbuf, DYN_H2_HEADERS); Curl_dyn_init(&stream->trailer_recvbuf, DYN_H2_TRAILERS); 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 = http2_init(data, conn); if(result) { Curl_dyn_free(&stream->header_recvbuf); return result; } infof(data, "Using HTTP2, server supports multi-use\n"); stream->upload_left = 0; stream->upload_mem = NULL; stream->upload_len = 0; stream->mem = data->state.buffer; stream->len = data->set.buffer_size; 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(data, "Connection state changed (HTTP/2 confirmed)\n"); multi_connchanged(data->multi); return CURLE_OK; } CURLcode Curl_http2_switched(struct Curl_easy *data, const char *mem, size_t nread) { CURLcode result; struct connectdata *conn = data->conn; struct http_conn *httpc = &conn->proto.httpc; int rv; struct HTTP *stream = data->req.p.http; result = Curl_http2_setup(data, 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(data->req.upgr101 == UPGR101_RECEIVED) { /* stream 1 is opened implicitly on upgrade */ stream->stream_id = 1; /* queue SETTINGS frame (again) */ rv = nghttp2_session_upgrade2(httpc->h2, httpc->binsettings, httpc->binlen, data->state.httpreq == HTTPREQ_HEAD, NULL); if(rv) { failf(data, "nghttp2_session_upgrade2() 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(data, 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) { failf(data, "nghttp2_submit_settings() failed: %s(%d)", nghttp2_strerror(rv), rv); return CURLE_HTTP2; } } rv = nghttp2_session_set_local_window_size(httpc->h2, NGHTTP2_FLAG_NONE, 0, HTTP2_HUGE_WINDOW_SIZE); if(rv) { failf(data, "nghttp2_session_set_local_window_size() 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=%d, datalen=%zu", H2_BUFSIZE, nread); return CURLE_HTTP2; } infof(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; DEBUGASSERT(httpc->nread_inbuf == 0); /* Good enough to call it an end once the remaining payload is copied to the * connection buffer. * Some servers (e.g. nghttpx v1.43.0) may fulfill stream 1 immediately * following the protocol switch other than waiting for the client-side * connection preface. If h2_process_pending_input is invoked here to parse * the remaining payload, stream 1 would be marked as closed too early and * thus ignored in http2_recv (following 252790c53). * The logic in lib/http.c and lib/transfer.c guarantees a following * http2_recv would be invoked very soon. */ return CURLE_OK; } CURLcode Curl_http2_stream_pause(struct Curl_easy *data, bool pause) { DEBUGASSERT(data); DEBUGASSERT(data->conn); /* if it isn't HTTP/2, we're done */ if(!(data->conn->handler->protocol & PROTO_FAMILY_HTTP) || !data->conn->proto.httpc.h2) return CURLE_OK; #ifdef NGHTTP2_HAS_SET_LOCAL_WINDOW_SIZE else { struct HTTP *stream = data->req.p.http; struct http_conn *httpc = &data->conn->proto.httpc; uint32_t window = !pause * HTTP2_HUGE_WINDOW_SIZE; int rv = nghttp2_session_set_local_window_size(httpc->h2, NGHTTP2_FLAG_NONE, stream->stream_id, window); if(rv) { failf(data, "nghttp2_session_set_local_window_size() failed: %s(%d)", nghttp2_strerror(rv), rv); return CURLE_HTTP2; } /* make sure the window update gets sent */ rv = h2_session_send(data, httpc->h2); if(rv) return CURLE_SEND_ERROR; DEBUGF(infof(data, "Set HTTP/2 window size to %u for stream %u\n", window, stream->stream_id)); #ifdef DEBUGBUILD { /* read out the stream local window again */ uint32_t window2 = nghttp2_session_get_stream_local_window_size(httpc->h2, stream->stream_id); DEBUGF(infof(data, "HTTP/2 window size is now %u for stream %u\n", window2, stream->stream_id)); } #endif } #endif 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); } /* Only call this function for a transfer that already got a HTTP/2 CURLE_HTTP2_STREAM error! */ bool Curl_h2_http_1_1_error(struct Curl_easy *data) { struct HTTP *stream = data->req.p.http; return (stream->error == NGHTTP2_HTTP_1_1_REQUIRED); } #else /* !USE_NGHTTP2 */ /* Satisfy external references even if http2 is not compiled in. */ #include 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 */