385 lines
13 KiB
C
385 lines
13 KiB
C
/*
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* SPDX-FileCopyrightText: 2017-2021 Espressif Systems (Shanghai) CO LTD
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*
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* SPDX-License-Identifier: Apache-2.0
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*/
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#include <stdlib.h>
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#include <stdint.h>
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#include <stddef.h>
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#include <stdio.h>
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#include <string.h>
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#include <unistd.h>
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#include <ctype.h>
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#include <netdb.h>
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#include <esp_log.h>
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#include <http_parser.h>
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#include "sh2lib.h"
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static const char *TAG = "sh2lib";
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#define DBG_FRAME_SEND 1
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/*
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* The implementation of nghttp2_send_callback type. Here we write
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* |data| with size |length| to the network and return the number of
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* bytes actually written. See the documentation of
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* nghttp2_send_callback for the details.
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*/
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static ssize_t callback_send_inner(struct sh2lib_handle *hd, const uint8_t *data,
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size_t length)
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{
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int rv = esp_tls_conn_write(hd->http2_tls, data, length);
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if (rv <= 0) {
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if (rv == ESP_TLS_ERR_SSL_WANT_READ || rv == ESP_TLS_ERR_SSL_WANT_WRITE) {
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rv = NGHTTP2_ERR_WOULDBLOCK;
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} else {
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rv = NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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}
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return rv;
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}
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static ssize_t callback_send(nghttp2_session *session, const uint8_t *data,
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size_t length, int flags, void *user_data)
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{
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int rv = 0;
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struct sh2lib_handle *hd = user_data;
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int copy_offset = 0;
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int pending_data = length;
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/* Send data in 1000 byte chunks */
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while (copy_offset != length) {
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int chunk_len = pending_data > 1000 ? 1000 : pending_data;
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int subrv = callback_send_inner(hd, data + copy_offset, chunk_len);
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if (subrv <= 0) {
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if (copy_offset == 0) {
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/* If no data is transferred, send the error code */
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rv = subrv;
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}
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break;
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}
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copy_offset += subrv;
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pending_data -= subrv;
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rv += subrv;
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}
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return rv;
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}
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/*
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* The implementation of nghttp2_recv_callback type. Here we read data
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* from the network and write them in |buf|. The capacity of |buf| is
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* |length| bytes. Returns the number of bytes stored in |buf|. See
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* the documentation of nghttp2_recv_callback for the details.
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*/
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static ssize_t callback_recv(nghttp2_session *session, uint8_t *buf,
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size_t length, int flags, void *user_data)
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{
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struct sh2lib_handle *hd = user_data;
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int rv;
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rv = esp_tls_conn_read(hd->http2_tls, (char *)buf, (int)length);
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if (rv < 0) {
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if (rv == ESP_TLS_ERR_SSL_WANT_READ || rv == ESP_TLS_ERR_SSL_WANT_WRITE) {
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rv = NGHTTP2_ERR_WOULDBLOCK;
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} else {
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rv = NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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} else if (rv == 0) {
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rv = NGHTTP2_ERR_EOF;
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}
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return rv;
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}
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const char *sh2lib_frame_type_str(int type)
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{
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switch (type) {
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case NGHTTP2_HEADERS:
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return "HEADERS";
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break;
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case NGHTTP2_RST_STREAM:
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return "RST_STREAM";
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break;
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case NGHTTP2_GOAWAY:
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return "GOAWAY";
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break;
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case NGHTTP2_DATA:
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return "DATA";
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break;
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case NGHTTP2_SETTINGS:
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return "SETTINGS";
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break;
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case NGHTTP2_PUSH_PROMISE:
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return "PUSH_PROMISE";
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break;
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case NGHTTP2_PING:
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return "PING";
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break;
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default:
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return "other";
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break;
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}
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}
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static int callback_on_frame_send(nghttp2_session *session,
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const nghttp2_frame *frame, void *user_data)
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{
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ESP_LOGD(TAG, "[frame-send] frame type %s", sh2lib_frame_type_str(frame->hd.type));
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switch (frame->hd.type) {
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case NGHTTP2_HEADERS:
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if (nghttp2_session_get_stream_user_data(session, frame->hd.stream_id)) {
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ESP_LOGD(TAG, "[frame-send] C ----------------------------> S (HEADERS)");
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#if DBG_FRAME_SEND
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ESP_LOGD(TAG, "[frame-send] headers nv-len = %d", frame->headers.nvlen);
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const nghttp2_nv *nva = frame->headers.nva;
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size_t i;
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for (i = 0; i < frame->headers.nvlen; ++i) {
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ESP_LOGD(TAG, "[frame-send] %s : %s", nva[i].name, nva[i].value);
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}
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#endif
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}
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break;
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}
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return 0;
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}
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static int callback_on_frame_recv(nghttp2_session *session,
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const nghttp2_frame *frame, void *user_data)
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{
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ESP_LOGD(TAG, "[frame-recv][sid: %d] frame type %s", frame->hd.stream_id, sh2lib_frame_type_str(frame->hd.type));
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if (frame->hd.type != NGHTTP2_DATA) {
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return 0;
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}
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/* Subsequent processing only for data frame */
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sh2lib_frame_data_recv_cb_t data_recv_cb = nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
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if (data_recv_cb) {
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struct sh2lib_handle *h2 = user_data;
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(*data_recv_cb)(h2, NULL, 0, DATA_RECV_FRAME_COMPLETE);
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}
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return 0;
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}
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static int callback_on_stream_close(nghttp2_session *session, int32_t stream_id,
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uint32_t error_code, void *user_data)
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{
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ESP_LOGD(TAG, "[stream-close][sid %d]", stream_id);
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sh2lib_frame_data_recv_cb_t data_recv_cb = nghttp2_session_get_stream_user_data(session, stream_id);
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if (data_recv_cb) {
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struct sh2lib_handle *h2 = user_data;
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(*data_recv_cb)(h2, NULL, 0, DATA_RECV_RST_STREAM);
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}
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return 0;
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}
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static int callback_on_data_chunk_recv(nghttp2_session *session, uint8_t flags,
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int32_t stream_id, const uint8_t *data,
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size_t len, void *user_data)
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{
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sh2lib_frame_data_recv_cb_t data_recv_cb;
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ESP_LOGD(TAG, "[data-chunk][sid:%d]", stream_id);
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data_recv_cb = nghttp2_session_get_stream_user_data(session, stream_id);
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if (data_recv_cb) {
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ESP_LOGD(TAG, "[data-chunk] C <---------------------------- S (DATA chunk)"
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"%lu bytes",
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(unsigned long int)len);
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struct sh2lib_handle *h2 = user_data;
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(*data_recv_cb)(h2, (char *)data, len, 0);
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/* TODO: What to do with the return value: look for pause/abort */
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}
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return 0;
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}
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static int callback_on_header(nghttp2_session *session, const nghttp2_frame *frame,
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const uint8_t *name, size_t namelen, const uint8_t *value,
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size_t valuelen, uint8_t flags, void *user_data)
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{
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ESP_LOGD(TAG, "[hdr-recv][sid:%d] %s : %s", frame->hd.stream_id, name, value);
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return 0;
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}
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static int do_http2_connect(struct sh2lib_handle *hd)
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{
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int ret;
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nghttp2_session_callbacks *callbacks;
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nghttp2_session_callbacks_new(&callbacks);
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nghttp2_session_callbacks_set_send_callback(callbacks, callback_send);
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nghttp2_session_callbacks_set_recv_callback(callbacks, callback_recv);
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nghttp2_session_callbacks_set_on_frame_send_callback(callbacks, callback_on_frame_send);
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nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks, callback_on_frame_recv);
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nghttp2_session_callbacks_set_on_stream_close_callback(callbacks, callback_on_stream_close);
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nghttp2_session_callbacks_set_on_data_chunk_recv_callback(callbacks, callback_on_data_chunk_recv);
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nghttp2_session_callbacks_set_on_header_callback(callbacks, callback_on_header);
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ret = nghttp2_session_client_new(&hd->http2_sess, callbacks, hd);
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if (ret != 0) {
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ESP_LOGE(TAG, "[sh2-connect] New http2 session failed");
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nghttp2_session_callbacks_del(callbacks);
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return -1;
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}
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nghttp2_session_callbacks_del(callbacks);
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/* Create the SETTINGS frame */
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ret = nghttp2_submit_settings(hd->http2_sess, NGHTTP2_FLAG_NONE, NULL, 0);
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if (ret != 0) {
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ESP_LOGE(TAG, "[sh2-connect] Submit settings failed");
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return -1;
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}
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return 0;
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}
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int sh2lib_connect(struct sh2lib_config_t *cfg, struct sh2lib_handle *hd)
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{
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memset(hd, 0, sizeof(*hd));
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if (cfg == NULL) {
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ESP_LOGE(TAG, "[sh2-connect] pointer to sh2lib configurations cannot be NULL");
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goto error;
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}
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const char *proto[] = {"h2", NULL};
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esp_tls_cfg_t tls_cfg = {
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.alpn_protos = proto,
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.cacert_buf = cfg->cacert_buf,
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.cacert_bytes = cfg->cacert_bytes,
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.crt_bundle_attach = cfg->crt_bundle_attach,
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.non_block = true,
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.timeout_ms = 10 * 1000,
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};
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#if ESP_IDF_VERSION >= ESP_IDF_VERSION_VAL(5, 0, 0)
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hd->http2_tls = esp_tls_init();
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if (!hd->http2_tls) {
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ESP_LOGE(TAG, "Failed to allocate esp_tls handle!");
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goto error;
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}
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// NOTE: This API is an alternative to previous `esp_tls_conn_http_new` from ESP-IDF v5.0 onwards.
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if (esp_tls_conn_http_new_sync(cfg->uri, &tls_cfg, hd->http2_tls) != 1) {
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#else
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if ((hd->http2_tls = esp_tls_conn_http_new(cfg->uri, &tls_cfg)) == NULL) {
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#endif
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ESP_LOGE(TAG, "[sh2-connect] esp-tls connection failed");
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goto error;
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}
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struct http_parser_url u;
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http_parser_url_init(&u);
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http_parser_parse_url(cfg->uri, strlen(cfg->uri), 0, &u);
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hd->hostname = strndup(&cfg->uri[u.field_data[UF_HOST].off], u.field_data[UF_HOST].len);
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/* HTTP/2 Connection */
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if (do_http2_connect(hd) != 0) {
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ESP_LOGE(TAG, "[sh2-connect] HTTP2 Connection failed with %s", cfg->uri);
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goto error;
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}
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return 0;
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error:
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sh2lib_free(hd);
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return -1;
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}
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void sh2lib_free(struct sh2lib_handle *hd)
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{
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if (hd->http2_sess) {
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nghttp2_session_del(hd->http2_sess);
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hd->http2_sess = NULL;
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}
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if (hd->http2_tls) {
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esp_tls_conn_destroy(hd->http2_tls);
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hd->http2_tls = NULL;
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}
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if (hd->hostname) {
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free(hd->hostname);
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hd->hostname = NULL;
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}
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}
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int sh2lib_execute(struct sh2lib_handle *hd)
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{
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int ret;
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ret = nghttp2_session_send(hd->http2_sess);
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if (ret != 0) {
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ESP_LOGE(TAG, "[sh2-execute] HTTP2 session send failed %d", ret);
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return -1;
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}
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ret = nghttp2_session_recv(hd->http2_sess);
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if (ret != 0) {
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ESP_LOGE(TAG, "[sh2-execute] HTTP2 session recv failed %d", ret);
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return -1;
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}
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return 0;
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}
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int sh2lib_do_get_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen, sh2lib_frame_data_recv_cb_t recv_cb)
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{
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int ret = nghttp2_submit_request(hd->http2_sess, NULL, nva, nvlen, NULL, recv_cb);
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if (ret < 0) {
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ESP_LOGE(TAG, "[sh2-do-get] HEADERS call failed");
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return -1;
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}
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return ret;
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}
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int sh2lib_do_get(struct sh2lib_handle *hd, const char *path, sh2lib_frame_data_recv_cb_t recv_cb)
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{
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const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "GET"),
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SH2LIB_MAKE_NV(":scheme", "https"),
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SH2LIB_MAKE_NV(":authority", hd->hostname),
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SH2LIB_MAKE_NV(":path", path),
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};
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return sh2lib_do_get_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), recv_cb);
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}
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ssize_t sh2lib_data_provider_cb(nghttp2_session *session, int32_t stream_id, uint8_t *buf,
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size_t length, uint32_t *data_flags,
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nghttp2_data_source *source, void *user_data)
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{
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struct sh2lib_handle *h2 = user_data;
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sh2lib_putpost_data_cb_t data_cb = source->ptr;
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return (*data_cb)(h2, (char *)buf, length, data_flags);
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}
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int sh2lib_do_putpost_with_nv(struct sh2lib_handle *hd, const nghttp2_nv *nva, size_t nvlen,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb)
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{
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nghttp2_data_provider sh2lib_data_provider;
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sh2lib_data_provider.read_callback = sh2lib_data_provider_cb;
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sh2lib_data_provider.source.ptr = send_cb;
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int ret = nghttp2_submit_request(hd->http2_sess, NULL, nva, nvlen, &sh2lib_data_provider, recv_cb);
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if (ret < 0) {
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ESP_LOGE(TAG, "[sh2-do-putpost] HEADERS call failed");
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return -1;
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}
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return ret;
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}
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int sh2lib_do_post(struct sh2lib_handle *hd, const char *path,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb)
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{
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const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "POST"),
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SH2LIB_MAKE_NV(":scheme", "https"),
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SH2LIB_MAKE_NV(":authority", hd->hostname),
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SH2LIB_MAKE_NV(":path", path),
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};
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return sh2lib_do_putpost_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), send_cb, recv_cb);
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}
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int sh2lib_do_put(struct sh2lib_handle *hd, const char *path,
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sh2lib_putpost_data_cb_t send_cb,
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sh2lib_frame_data_recv_cb_t recv_cb)
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{
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const nghttp2_nv nva[] = { SH2LIB_MAKE_NV(":method", "PUT"),
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SH2LIB_MAKE_NV(":scheme", "https"),
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SH2LIB_MAKE_NV(":authority", hd->hostname),
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SH2LIB_MAKE_NV(":path", path),
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};
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return sh2lib_do_putpost_with_nv(hd, nva, sizeof(nva) / sizeof(nva[0]), send_cb, recv_cb);
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}
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