6bb9635b2d
- 新增 http2.c / http2.h：基于 nghttp2 的 HTTP/2 会话管理 - 支持 TLS ALPN 协商和明文 h2c 升级 - 流级请求/响应处理，集成现有 http_request_t 结构 - 编译通过，链接 -lnghttp2 - Makefile 更新：包含 http2.c 和 nghttp2 库链接 - 待完成：server.c 集成（ALPN 协商、h2c 升级检测）
432 lines
14 KiB
C
432 lines
14 KiB
C
/**
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* http2.c - HTTP/2 支持实现
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*
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* 使用 nghttp2 库实现 HTTP/2 协议支持。
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* 与 cocoon 的协程 I/O 和 TLS 层集成。
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*
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* @author xfy
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*/
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#include "http2.h"
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#include "static.h"
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#include "log.h"
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#include "tls.h"
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#include <errno.h>
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#include <fcntl.h>
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#include <sys/stat.h>
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/* 最大 HTTP/2 会话数 */
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#define MAX_HTTP2_SESSIONS 1024
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static http2_session_t *g_sessions[MAX_HTTP2_SESSIONS];
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static int g_session_count = 0;
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/* 内部函数声明 */
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static ssize_t send_callback(nghttp2_session *session __attribute__((unused)), const uint8_t *data,
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size_t length, int flags __attribute__((unused)), void *user_data);
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static int on_begin_headers_callback(nghttp2_session *session,
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const nghttp2_frame *frame,
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void *user_data);
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static int on_header_callback(nghttp2_session *session,
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const nghttp2_frame *frame, const uint8_t *name,
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size_t namelen, const uint8_t *value,
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size_t valuelen, uint8_t flags,
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void *user_data);
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static int on_frame_recv_callback(nghttp2_session *session,
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const nghttp2_frame *frame, void *user_data);
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static int on_stream_close_callback(nghttp2_session *session,
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int32_t stream_id, uint32_t error_code,
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void *user_data);
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static int on_data_chunk_recv_callback(nghttp2_session *session,
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uint8_t flags, int32_t stream_id,
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const uint8_t *data,
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size_t len, void *user_data);
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/* ===================== 会话管理 ===================== */
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int http2_init(void) {
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memset(g_sessions, 0, sizeof(g_sessions));
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g_session_count = 0;
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return 0;
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}
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void http2_cleanup(void) {
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for (int i = 0; i < MAX_HTTP2_SESSIONS; i++) {
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if (g_sessions[i]) {
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http2_session_destroy(g_sessions[i]);
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g_sessions[i] = NULL;
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}
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}
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g_session_count = 0;
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}
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http2_session_t *http2_session_create(int fd, bool tls_mode) {
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if (fd < 0 || fd >= MAX_HTTP2_SESSIONS) {
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return NULL;
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}
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if (g_sessions[fd] != NULL) {
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/* 已存在，先销毁 */
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http2_session_destroy(g_sessions[fd]);
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}
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http2_session_t *h2 = calloc(1, sizeof(http2_session_t));
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if (!h2) {
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return NULL;
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}
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h2->fd = fd;
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h2->tls_mode = tls_mode;
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/* 创建 nghttp2 会话 */
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nghttp2_session_callbacks *callbacks = NULL;
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if (nghttp2_session_callbacks_new(&callbacks) != 0) {
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free(h2);
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return NULL;
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}
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nghttp2_session_callbacks_set_send_callback(callbacks, send_callback);
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nghttp2_session_callbacks_set_on_begin_headers_callback(
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callbacks, on_begin_headers_callback);
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nghttp2_session_callbacks_set_on_header_callback(callbacks,
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on_header_callback);
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nghttp2_session_callbacks_set_on_frame_recv_callback(callbacks,
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on_frame_recv_callback);
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nghttp2_session_callbacks_set_on_stream_close_callback(
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callbacks, on_stream_close_callback);
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nghttp2_session_callbacks_set_on_data_chunk_recv_callback(
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callbacks, on_data_chunk_recv_callback);
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if (nghttp2_session_server_new(&h2->session, callbacks, h2) != 0) {
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nghttp2_session_callbacks_del(callbacks);
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free(h2);
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return NULL;
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}
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nghttp2_session_callbacks_del(callbacks);
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/* 发送服务器连接前言（SETTINGS 帧） */
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nghttp2_settings_entry iv[] = {
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{NGHTTP2_SETTINGS_MAX_CONCURRENT_STREAMS, 100},
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{NGHTTP2_SETTINGS_INITIAL_WINDOW_SIZE, (1 << 16) - 1}};
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if (nghttp2_submit_settings(h2->session, NGHTTP2_FLAG_NONE, iv,
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sizeof(iv) / sizeof(iv[0])) != 0) {
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nghttp2_session_del(h2->session);
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free(h2);
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return NULL;
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}
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g_sessions[fd] = h2;
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g_session_count++;
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return h2;
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}
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void http2_session_destroy(http2_session_t *h2) {
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if (!h2) return;
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if (h2->fd >= 0 && h2->fd < MAX_HTTP2_SESSIONS) {
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g_sessions[h2->fd] = NULL;
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}
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g_session_count--;
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if (h2->session) {
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nghttp2_session_del(h2->session);
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}
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/* 清理所有流 */
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http2_stream_data_t *stream = h2->streams;
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while (stream) {
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http2_stream_data_t *next = stream->next;
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if (stream->file_fd >= 0) {
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close(stream->file_fd);
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}
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free(stream->response_body);
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http_request_free(&stream->request);
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free(stream);
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stream = next;
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}
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free(h2);
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}
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bool http2_session_is_http2(int fd) {
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if (fd < 0 || fd >= MAX_HTTP2_SESSIONS) return false;
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return g_sessions[fd] != NULL;
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}
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http2_session_t *http2_session_get(int fd) {
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if (fd < 0 || fd >= MAX_HTTP2_SESSIONS) return NULL;
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return g_sessions[fd];
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}
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/* ===================== 数据收发 ===================== */
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int http2_recv(http2_session_t *h2, const uint8_t *buf, size_t len) {
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if (!h2 || !h2->session) return -1;
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ssize_t readlen = nghttp2_session_mem_recv(h2->session, buf, len);
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if (readlen < 0) {
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log_error("HTTP/2 接收错误: %s", nghttp2_strerror((int)readlen));
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return -1;
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}
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/* 发送任何挂起的输出帧 */
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return http2_send_pending(h2);
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}
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int http2_send_pending(http2_session_t *h2) {
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if (!h2 || !h2->session) return -1;
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int rv = nghttp2_session_send(h2->session);
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if (rv != 0) {
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log_error("HTTP/2 发送错误: %s", nghttp2_strerror(rv));
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return -1;
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}
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return 0;
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}
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bool http2_want_read(http2_session_t *h2) {
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if (!h2 || !h2->session) return false;
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return nghttp2_session_want_read(h2->session) != 0;
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}
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bool http2_want_write(http2_session_t *h2) {
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if (!h2 || !h2->session) return false;
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return nghttp2_session_want_write(h2->session) != 0;
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}
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/* ===================== nghttp2 回调 ===================== */
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/**
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* send_callback - nghttp2 发送回调
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*
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* 将 nghttp2 序列化后的帧数据发送到 socket。
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*/
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static ssize_t send_callback(nghttp2_session *session __attribute__((unused)),
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const uint8_t *data, size_t length,
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int flags __attribute__((unused)),
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void *user_data) {
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http2_session_t *h2 = (http2_session_t *)user_data;
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/* 使用 TLS 或原始 socket 发送 */
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ssize_t sent;
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if (h2->tls_mode && tls_has_connection(h2->fd)) {
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sent = tls_write(h2->fd, (const char *)data, length);
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} else {
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sent = send_all(h2->fd, (const char *)data, length);
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}
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if (sent < 0) {
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return NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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return (int)sent;
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}
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/**
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* on_begin_headers_callback - 开始接收请求头
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*/
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static int on_begin_headers_callback(nghttp2_session *session __attribute__((unused)),
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const nghttp2_frame *frame,
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void *user_data) {
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http2_session_t *h2 = (http2_session_t *)user_data;
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if (frame->hd.type != NGHTTP2_HEADERS ||
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frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
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return 0;
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}
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/* 创建新流数据 */
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http2_stream_data_t *stream = calloc(1, sizeof(http2_stream_data_t));
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if (!stream) {
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return NGHTTP2_ERR_CALLBACK_FAILURE;
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}
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stream->stream_id = frame->hd.stream_id;
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stream->file_fd = -1;
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/* 插入链表头部 */
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stream->next = h2->streams;
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h2->streams = stream;
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/* 关联到 nghttp2 流 */
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nghttp2_session_set_stream_user_data(session, frame->hd.stream_id, stream);
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return 0;
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}
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/**
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* on_header_callback - 接收单个请求头
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*/
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static int on_header_callback(nghttp2_session *session,
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const nghttp2_frame *frame, const uint8_t *name,
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size_t namelen, const uint8_t *value,
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size_t valuelen, uint8_t flags __attribute__((unused)),
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void *user_data __attribute__((unused))) {
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if (frame->hd.type != NGHTTP2_HEADERS ||
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frame->headers.cat != NGHTTP2_HCAT_REQUEST) {
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return 0;
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}
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http2_stream_data_t *stream =
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nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
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if (!stream) {
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return 0;
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}
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/* 收集伪头和普通头 */
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if (namelen == 4 && memcmp(":path", name, 4) == 0) {
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/* 解析路径（可能包含 query string） */
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size_t path_len = valuelen;
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for (size_t i = 0; i < valuelen; i++) {
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if (value[i] == '?') {
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path_len = i;
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break;
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}
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}
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if (path_len > 0) {
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memcpy(stream->request.path, value,
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path_len < sizeof(stream->request.path) - 1
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? path_len
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: sizeof(stream->request.path) - 1);
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}
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} else if (namelen == 7 && memcmp(":method", name, 7) == 0) {
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if (valuelen == 3 && memcmp("GET", value, 3) == 0) {
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stream->request.method = HTTP_GET;
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} else if (valuelen == 4 && memcmp("HEAD", value, 4) == 0) {
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stream->request.method = HTTP_HEAD;
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} else if (valuelen == 4 && memcmp("POST", value, 4) == 0) {
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stream->request.method = HTTP_POST;
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} else {
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stream->request.method = HTTP_UNKNOWN;
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}
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} else if (namelen == 7 && memcmp(":scheme", name, 7) == 0) {
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/* 忽略 scheme */
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} else if (namelen == 10 && memcmp(":authority", name, 10) == 0) {
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/* 忽略 authority，host 可以从 path 推断 */
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} else {
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/* 普通头字段 */
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if (stream->request.num_headers < HTTP_MAX_HEADERS) {
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int idx = stream->request.num_headers;
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memcpy(stream->request.headers[idx].name, name,
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namelen < sizeof(stream->request.headers[idx].name) - 1 ? namelen : sizeof(stream->request.headers[idx].name) - 1);
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memcpy(stream->request.headers[idx].value, value,
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valuelen < sizeof(stream->request.headers[idx].value) - 1 ? valuelen : sizeof(stream->request.headers[idx].value) - 1);
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stream->request.num_headers++;
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}
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}
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return 0;
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}
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/**
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* on_frame_recv_callback - 帧接收完成
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*/
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static int on_frame_recv_callback(nghttp2_session *session,
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const nghttp2_frame *frame, void *user_data) {
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http2_session_t *h2 = (http2_session_t *)user_data;
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switch (frame->hd.type) {
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case NGHTTP2_DATA:
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case NGHTTP2_HEADERS:
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/* 检查请求是否完整（END_STREAM） */
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if (frame->hd.flags & NGHTTP2_FLAG_END_STREAM) {
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http2_stream_data_t *stream =
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nghttp2_session_get_stream_user_data(session, frame->hd.stream_id);
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if (!stream) {
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return 0;
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}
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stream->request_complete = true;
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/* TODO: 处理请求并生成响应 */
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/* 目前返回 501 Not Implemented */
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nghttp2_nv hdrs[] = {
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{(uint8_t *)":status", (uint8_t *)"501", 7, 3, 0}};
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nghttp2_submit_response(session, frame->hd.stream_id, hdrs, 1,
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NULL);
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http2_send_pending(h2);
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}
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break;
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default:
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break;
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}
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return 0;
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}
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/**
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* on_stream_close_callback - 流关闭
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*/
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static int on_stream_close_callback(nghttp2_session *session __attribute__((unused)),
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int32_t stream_id, uint32_t error_code __attribute__((unused)),
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void *user_data) {
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http2_session_t *h2 = (http2_session_t *)user_data;
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/* 从链表中移除并释放 */
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http2_stream_data_t **pp = &h2->streams;
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while (*pp) {
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if ((*pp)->stream_id == stream_id) {
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http2_stream_data_t *to_free = *pp;
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*pp = to_free->next;
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if (to_free->file_fd >= 0) {
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close(to_free->file_fd);
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}
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free(to_free->response_body);
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http_request_free(&to_free->request);
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free(to_free);
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return 0;
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}
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pp = &(*pp)->next;
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}
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return 0;
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}
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/**
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* on_data_chunk_recv_callback - 接收请求体数据
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*/
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static int on_data_chunk_recv_callback(nghttp2_session *session __attribute__((unused)),
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uint8_t flags __attribute__((unused)),
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int32_t stream_id, const uint8_t *data,
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size_t len, void *user_data __attribute__((unused))) {
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http2_stream_data_t *stream =
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nghttp2_session_get_stream_user_data(session, stream_id);
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if (!stream) {
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return 0;
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}
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/* TODO: 将数据追加到请求体缓冲区 */
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(void)data;
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(void)len;
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return 0;
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}
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/* ===================== 连接处理 ===================== */
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int http2_on_connection_accepted(int fd, bool tls_mode) {
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/* 检查是否应启用 HTTP/2 */
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if (!tls_mode) {
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/* 明文模式：需要读取客户端魔术字 "PRI * HTTP/2.0\r\n\r\nSM\r\n\r\n" */
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/* 这由 server.c 在读取前几个字节时检测 */
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return 0;
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}
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/* TLS 模式：ALPN 已协商为 h2 */
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http2_session_t *h2 = http2_session_create(fd, true);
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if (!h2) {
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return -1;
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}
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/* 发送服务器连接前言 */
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if (http2_send_pending(h2) != 0) {
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http2_session_destroy(h2);
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return -1;
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}
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return 0;
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}
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