0d8c36ef25
- config.c/http.c/static.c/server.c: 移除各自的 #define _GNU_SOURCE - Makefile CFLAGS: 添加 -D_GNU_SOURCE，保证所有翻译单元一致 - 避免重复定义，减少源文件样板代码
366 lines
14 KiB
C
366 lines
14 KiB
C
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/**
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* http.c - HTTP 解析与响应构建
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*
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* 轻量级 HTTP/1.1 解析器，支持请求解析、响应头格式化、MIME 类型识别。
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*
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* @author xfy
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*/
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#include "http.h"
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#include <string.h>
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#include <stdio.h>
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#include <ctype.h>
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#include <stdlib.h>
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/**
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* http_method_str - HTTP 方法枚举转字符串
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*
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* @param method HTTP 方法枚举值
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* @return 方法名称字符串，未知方法返回 "UNKNOWN"
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*/
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const char *http_method_str(http_method_t method) {
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switch (method) {
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case HTTP_GET: return "GET";
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case HTTP_HEAD: return "HEAD";
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case HTTP_POST: return "POST";
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case HTTP_PUT: return "PUT";
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case HTTP_DELETE: return "DELETE";
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case HTTP_OPTIONS: return "OPTIONS";
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default: return "UNKNOWN";
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}
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}
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/**
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* parse_method - 从缓冲区开头解析 HTTP 方法
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*
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* @param buf 输入缓冲区
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* @return 解析出的 HTTP 方法枚举
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*/
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static http_method_t parse_method(const char *buf) {
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if (strncmp(buf, "GET ", 4) == 0) return HTTP_GET;
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if (strncmp(buf, "HEAD ", 5) == 0) return HTTP_HEAD;
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if (strncmp(buf, "POST ", 5) == 0) return HTTP_POST;
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if (strncmp(buf, "PUT ", 4) == 0) return HTTP_PUT;
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if (strncmp(buf, "DELETE ", 7) == 0) return HTTP_DELETE;
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if (strncmp(buf, "OPTIONS ", 8) == 0) return HTTP_OPTIONS;
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return HTTP_UNKNOWN;
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}
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/**
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* parse_headers - 解析请求头键值对
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*
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* 逐行解析，填充 headers 数组，同时提取 content-length、connection 等常用头。
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*
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* @param p 当前解析位置指针（会被推进）
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* @param end 缓冲区结尾
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* @param req 请求结构体
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*/
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static void parse_headers(const char **p, const char *end, http_request_t *req) {
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req->num_headers = 0;
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req->content_length = -1;
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req->keep_alive = false;
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req->has_range = false;
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req->range_start = 0;
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req->range_end = -1;
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req->has_if_none_match = false;
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req->has_if_modified_since = false;
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req->accept_gzip = false;
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req->accept_deflate = false;
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req->has_accept_encoding = false;
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while (*p < end && req->num_headers < HTTP_MAX_HEADERS) {
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const char *line_start = *p;
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/* 查找行尾 */
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const char *line_end = memchr(line_start, '\n', end - line_start);
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if (!line_end) break;
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/* 空行表示头部结束 */
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if (line_end == line_start || (line_end == line_start + 1 && line_start[0] == '\r')) {
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*p = line_end + 1;
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break;
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}
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/* 跳过末尾 \r */
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const char *line_tail = line_end;
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if (line_tail > line_start && line_tail[-1] == '\r') line_tail--;
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/* 查找冒号分隔符 */
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const char *colon = memchr(line_start, ':', line_tail - line_start);
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if (colon) {
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int name_len = colon - line_start;
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if (name_len > 0 && name_len < HTTP_HEADER_NAME_MAX) {
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/* 复制名称（转小写便于匹配） */
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for (int i = 0; i < name_len && i < HTTP_HEADER_NAME_MAX - 1; i++) {
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req->headers[req->num_headers].name[i] = (char)tolower((unsigned char)line_start[i]);
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}
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req->headers[req->num_headers].name[name_len > HTTP_HEADER_NAME_MAX - 1 ? HTTP_HEADER_NAME_MAX - 1 : name_len] = '\0';
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/* 复制值（跳过冒号后空格） */
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const char *val = colon + 1;
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while (val < line_tail && (*val == ' ' || *val == '\t')) val++;
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int val_len = line_tail - val;
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if (val_len > 0 && val_len < HTTP_HEADER_VALUE_MAX) {
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int copy_len = val_len > HTTP_HEADER_VALUE_MAX - 1 ? HTTP_HEADER_VALUE_MAX - 1 : val_len;
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memcpy(req->headers[req->num_headers].value, val, copy_len);
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req->headers[req->num_headers].value[copy_len] = '\0';
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}
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/* 提取常用头 */
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if (strcmp(req->headers[req->num_headers].name, "content-length") == 0) {
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req->content_length = atoll(req->headers[req->num_headers].value);
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} else if (strcmp(req->headers[req->num_headers].name, "connection") == 0) {
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req->keep_alive = (strcasecmp(req->headers[req->num_headers].value, "keep-alive") == 0);
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} else if (strcmp(req->headers[req->num_headers].name, "if-none-match") == 0) {
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req->has_if_none_match = true;
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int copy_len = strlen(req->headers[req->num_headers].value);
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if (copy_len >= 64) copy_len = 63;
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memcpy(req->if_none_match, req->headers[req->num_headers].value, copy_len);
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req->if_none_match[copy_len] = '\0';
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} else if (strcmp(req->headers[req->num_headers].name, "if-modified-since") == 0) {
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req->has_if_modified_since = true;
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int copy_len = strlen(req->headers[req->num_headers].value);
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if (copy_len >= 64) copy_len = 63;
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memcpy(req->if_modified_since, req->headers[req->num_headers].value, copy_len);
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req->if_modified_since[copy_len] = '\0';
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} else if (strcmp(req->headers[req->num_headers].name, "accept-encoding") == 0) {
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req->has_accept_encoding = true;
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const char *val = req->headers[req->num_headers].value;
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if (strstr(val, "gzip") != NULL) req->accept_gzip = true;
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if (strstr(val, "deflate") != NULL) req->accept_deflate = true;
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} else if (strcmp(req->headers[req->num_headers].name, "content-type") == 0) {
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int copy_len = strlen(req->headers[req->num_headers].value);
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if (copy_len >= HTTP_HEADER_VALUE_MAX) copy_len = HTTP_HEADER_VALUE_MAX - 1;
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memcpy(req->content_type, req->headers[req->num_headers].value, copy_len);
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req->content_type[copy_len] = '\0';
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} else if (strcmp(req->headers[req->num_headers].name, "range") == 0) {
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const char *range_val = req->headers[req->num_headers].value;
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if (strncasecmp(range_val, "bytes=", 6) == 0) {
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req->has_range = true;
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req->range_start = atoll(range_val + 6);
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const char *dash = strchr(range_val + 6, '-');
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if (dash) {
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if (dash[1] == '\0') {
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req->range_end = -1; /* open-end range */
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} else {
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req->range_end = atoll(dash + 1);
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}
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}
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}
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}
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req->num_headers++;
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}
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}
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*p = line_end + 1;
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}
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}
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/**
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* http_parse_request - 解析 HTTP 请求
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*
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* 从缓冲区解析 HTTP/1.x 请求行和头部，填充 http_request_t 结构体。
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* 不解析请求体。
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*
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* @param buf 输入缓冲区
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* @param len 缓冲区长度
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* @param req 输出请求结构体
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* @return 成功解析的字节数，-1 表示数据不完整，-2 表示格式错误
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*/
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int http_parse_request(const char *buf, size_t len, http_request_t *req) {
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if (!buf || !req || len == 0) return -2;
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memset(req, 0, sizeof(*req));
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/* 查找请求行结尾（\r\n） */
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const char *line_end = memchr(buf, '\n', len);
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if (!line_end) return -1; /* 数据不完整 */
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int line_len = line_end - buf;
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if (line_len > 0 && buf[line_len - 1] == '\r') line_len--;
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if (line_len < 10) return -2; /* 请求行太短 */
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/* 解析方法 */
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req->method = parse_method(buf);
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if (req->method == HTTP_UNKNOWN) return -2;
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/* 提取路径 */
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const char *path_start = strchr(buf, ' ');
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if (!path_start) return -2;
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path_start++;
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const char *path_end = strchr(path_start, ' ');
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if (!path_end) return -2;
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int path_len = path_end - path_start;
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if (path_len <= 0 || path_len >= HTTP_MAX_PATH) return -2;
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memcpy(req->path, path_start, path_len);
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req->path[path_len] = '\0';
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/* 提取 HTTP 版本 */
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const char *ver_start = path_end + 1;
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int ver_len = line_len - (ver_start - buf);
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if (ver_len > 0 && ver_len < (int)sizeof(req->version)) {
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memcpy(req->version, ver_start, ver_len);
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req->version[ver_len] = '\0';
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}
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/* 解析头部 */
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const char *p = line_end + 1;
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const char *end = buf + len;
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parse_headers(&p, end, req);
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/* HTTP/1.1 默认 keep-alive，但 Connection 头可覆盖 */
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bool has_connection = false;
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for (int i = 0; i < req->num_headers; i++) {
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if (strcmp(req->headers[i].name, "connection") == 0) {
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has_connection = true;
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break;
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}
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}
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if (!has_connection && strstr(req->version, "1.1") != NULL) {
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req->keep_alive = true;
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}
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return p - buf;
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}
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/**
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* http_format_response_header - 格式化 HTTP 响应头
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*
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* 将响应信息格式化为标准 HTTP/1.1 响应头字符串。
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*
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* @param buf 输出缓冲区
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* @param buf_size 缓冲区大小
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* @param resp 响应信息结构体
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* @return 实际写入的字节数，负值表示缓冲区不足
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*/
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int http_format_response_header(char *buf, size_t buf_size, const http_response_t *resp) {
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if (!buf || !resp || buf_size == 0) return -1;
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int n = 0;
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/* 状态行 */
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if (resp->has_range) {
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n += snprintf(buf + n, buf_size - (size_t)n > buf_size ? 0 : buf_size - (size_t)n,
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"HTTP/1.1 %d %s\r\n"
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"Content-Type: %s\r\n"
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"Content-Length: %ld\r\n"
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"Accept-Ranges: bytes\r\n"
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"Content-Range: bytes %ld-%ld/%ld\r\n",
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resp->status_code, resp->status_text,
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resp->content_type ? resp->content_type : "application/octet-stream",
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(long)resp->content_length,
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(long)resp->range_start, (long)resp->range_end, (long)resp->total_length);
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} else {
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n += snprintf(buf + n, buf_size - (size_t)n > buf_size ? 0 : buf_size - (size_t)n,
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"HTTP/1.1 %d %s\r\n"
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"Content-Type: %s\r\n"
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"Content-Length: %ld\r\n"
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"Accept-Ranges: bytes\r\n",
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resp->status_code, resp->status_text,
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resp->content_type ? resp->content_type : "application/octet-stream",
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(long)resp->content_length);
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}
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/* 缓存头 */
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if (resp->etag && resp->etag[0]) {
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if ((size_t)n < buf_size) {
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n += snprintf(buf + n, buf_size - (size_t)n, "ETag: %s\r\n", resp->etag);
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} else {
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n += (int)strlen(resp->etag) + 8;
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}
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}
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if (resp->last_modified && resp->last_modified[0]) {
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if ((size_t)n < buf_size) {
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n += snprintf(buf + n, buf_size - (size_t)n, "Last-Modified: %s\r\n", resp->last_modified);
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} else {
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n += (int)strlen(resp->last_modified) + 16;
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}
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}
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if (resp->content_encoding && resp->content_encoding[0]) {
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if ((size_t)n < buf_size) {
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n += snprintf(buf + n, buf_size - (size_t)n, "Content-Encoding: %s\r\n", resp->content_encoding);
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} else {
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n += (int)strlen(resp->content_encoding) + 20;
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}
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}
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/* 连接头 + 空行 */
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if ((size_t)n < buf_size) {
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n += snprintf(buf + n, buf_size - (size_t)n,
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"Connection: %s\r\n"
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"Server: Cocoon/1.0\r\n"
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"\r\n",
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resp->keep_alive ? "keep-alive" : "close");
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} else {
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n += 35; /* approximate */
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}
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if ((size_t)n >= buf_size) return -1;
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return n;
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}
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/**
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* http_request_free - 释放 HTTP 请求中动态分配的资源
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*
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* @param req 请求结构体
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*/
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void http_request_free(http_request_t *req) {
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if (req && req->body) {
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free(req->body);
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req->body = NULL;
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req->body_len = 0;
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}
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}
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/**
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* http_mime_type - 根据文件扩展名推断 MIME 类型
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*
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* 支持常见静态资源类型的自动识别。
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*
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* @param path 文件路径
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* @return MIME 类型字符串
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*/
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const char *http_mime_type(const char *path) {
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const char *ext = strrchr(path, '.');
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if (!ext) return "application/octet-stream";
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/* 转小写比较 */
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char lower_ext[16];
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int i = 0;
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for (const char *p = ext + 1; *p && i < 15; p++, i++) {
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lower_ext[i] = (char)tolower((unsigned char)*p);
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}
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lower_ext[i] = '\0';
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if (strcmp(lower_ext, "html") == 0 || strcmp(lower_ext, "htm") == 0) return "text/html; charset=utf-8";
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if (strcmp(lower_ext, "css") == 0) return "text/css; charset=utf-8";
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if (strcmp(lower_ext, "js") == 0) return "application/javascript";
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if (strcmp(lower_ext, "json") == 0) return "application/json";
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if (strcmp(lower_ext, "png") == 0) return "image/png";
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if (strcmp(lower_ext, "jpg") == 0 || strcmp(lower_ext, "jpeg") == 0) return "image/jpeg";
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if (strcmp(lower_ext, "gif") == 0) return "image/gif";
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if (strcmp(lower_ext, "svg") == 0) return "image/svg+xml";
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if (strcmp(lower_ext, "ico") == 0) return "image/x-icon";
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if (strcmp(lower_ext, "woff2") == 0) return "font/woff2";
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if (strcmp(lower_ext, "woff") == 0) return "font/woff";
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if (strcmp(lower_ext, "ttf") == 0) return "font/ttf";
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if (strcmp(lower_ext, "txt") == 0) return "text/plain; charset=utf-8";
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if (strcmp(lower_ext, "md") == 0) return "text/markdown; charset=utf-8";
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if (strcmp(lower_ext, "xml") == 0) return "application/xml";
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if (strcmp(lower_ext, "pdf") == 0) return "application/pdf";
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if (strcmp(lower_ext, "zip") == 0) return "application/zip";
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if (strcmp(lower_ext, "gz") == 0) return "application/gzip";
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if (strcmp(lower_ext, "mp4") == 0) return "video/mp4";
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if (strcmp(lower_ext, "webm") == 0) return "video/webm";
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if (strcmp(lower_ext, "mp3") == 0) return "audio/mpeg";
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if (strcmp(lower_ext, "ogg") == 0) return "audio/ogg";
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if (strcmp(lower_ext, "wasm") == 0) return "application/wasm";
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if (strcmp(lower_ext, "webmanifest") == 0) return "application/manifest+json";
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return "application/octet-stream";
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}
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