acda3b9c3e
- proxy.h: 重构数据结构，支持多后端（cocoon_proxy_backend_t） - proxy.c: 实现轮询调度 + 自动故障转移（后端失败时尝试下一个） - proxy.c: proxy_add_rule 支持同 prefix 追加后端，自动合并为多后端规则 - server.c: 匹配 proxy.h 新签名 - 编译零警告，142 单元测试 + 82 集成测试全部通过
422 lines
14 KiB
C
422 lines
14 KiB
C
/**
|
|
* proxy.c - 反向代理实现
|
|
*
|
|
* 轻量级 HTTP/1.1 反向代理，支持流式转发。
|
|
*
|
|
* @author xfy
|
|
*/
|
|
|
|
#include "proxy.h"
|
|
#include "proxy_tls.h"
|
|
#include "log.h"
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <unistd.h>
|
|
#include <sys/socket.h>
|
|
#include <netinet/in.h>
|
|
#include <arpa/inet.h>
|
|
#include <netdb.h>
|
|
|
|
void proxy_init(cocoon_proxy_config_t *cfg) {
|
|
memset(cfg, 0, sizeof(*cfg));
|
|
cfg->count = 0;
|
|
}
|
|
|
|
static void parse_backend_url(const char *target_url, cocoon_proxy_backend_t *backend) {
|
|
/* 解析目标URL */
|
|
bool https = false;
|
|
const char *url = target_url;
|
|
|
|
backend->target_https = false;
|
|
backend->target_port = 80;
|
|
backend->target_host[0] = '\0';
|
|
backend->target_path[0] = '\0';
|
|
|
|
if (strncmp(url, "http://", 7) == 0) {
|
|
url += 7;
|
|
backend->target_https = false;
|
|
} else if (strncmp(url, "https://", 8) == 0) {
|
|
url += 8;
|
|
backend->target_https = true;
|
|
https = true;
|
|
} else {
|
|
/* 默认 http */
|
|
backend->target_https = false;
|
|
}
|
|
|
|
/* 提取 host:port 和剩余路径 */
|
|
const char *slash = strchr(url, '/');
|
|
char host_port[256];
|
|
if (slash) {
|
|
size_t host_len = (size_t)(slash - url);
|
|
if (host_len >= sizeof(host_port)) host_len = sizeof(host_port) - 1;
|
|
memcpy(host_port, url, host_len);
|
|
host_port[host_len] = '\0';
|
|
strncpy(backend->target_path, slash, sizeof(backend->target_path) - 1);
|
|
} else {
|
|
strncpy(host_port, url, sizeof(host_port) - 1);
|
|
host_port[sizeof(host_port) - 1] = '\0';
|
|
backend->target_path[0] = '\0';
|
|
}
|
|
|
|
/* 解析 host 和 port */
|
|
const char *colon = strrchr(host_port, ':');
|
|
if (colon) {
|
|
size_t host_len = (size_t)(colon - host_port);
|
|
if (host_len >= sizeof(backend->target_host)) host_len = sizeof(backend->target_host) - 1;
|
|
memcpy(backend->target_host, host_port, host_len);
|
|
backend->target_host[host_len] = '\0';
|
|
backend->target_port = (uint16_t)atoi(colon + 1);
|
|
} else {
|
|
size_t host_len = strlen(host_port);
|
|
if (host_len >= sizeof(backend->target_host)) host_len = sizeof(backend->target_host) - 1;
|
|
memcpy(backend->target_host, host_port, host_len);
|
|
backend->target_host[host_len] = '\0';
|
|
backend->target_port = https ? 443 : 80;
|
|
}
|
|
|
|
if (backend->target_port == 0) {
|
|
backend->target_port = https ? 443 : 80;
|
|
}
|
|
}
|
|
|
|
bool proxy_add_rule(cocoon_proxy_config_t *cfg, const char *prefix, const char *target_url) {
|
|
if (!prefix || !target_url || prefix[0] == '\0' || target_url[0] == '\0') {
|
|
return false;
|
|
}
|
|
|
|
/* 查找是否已有相同前缀的规则 */
|
|
cocoon_proxy_rule_t *rule = NULL;
|
|
for (size_t i = 0; i < cfg->count; i++) {
|
|
if (strcmp(cfg->rules[i].path_prefix, prefix) == 0) {
|
|
rule = &cfg->rules[i];
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (rule) {
|
|
/* 追加后端 */
|
|
if (rule->backend_count >= COCOON_MAX_PROXY_BACKENDS) {
|
|
log_error("后端数量超过上限 %d", COCOON_MAX_PROXY_BACKENDS);
|
|
return false;
|
|
}
|
|
cocoon_proxy_backend_t *backend = &rule->backends[rule->backend_count];
|
|
parse_backend_url(target_url, backend);
|
|
log_info("追加后端: %s -> %s://%s:%d%s",
|
|
rule->path_prefix,
|
|
backend->target_https ? "https" : "http",
|
|
backend->target_host,
|
|
backend->target_port,
|
|
backend->target_path);
|
|
rule->backend_count++;
|
|
return true;
|
|
}
|
|
|
|
/* 新建规则 */
|
|
if (cfg->count >= COCOON_MAX_PROXY_RULES) {
|
|
log_error("代理规则数量超过上限 %d", COCOON_MAX_PROXY_RULES);
|
|
return false;
|
|
}
|
|
|
|
rule = &cfg->rules[cfg->count];
|
|
strncpy(rule->path_prefix, prefix, sizeof(rule->path_prefix) - 1);
|
|
rule->path_prefix[sizeof(rule->path_prefix) - 1] = '\0';
|
|
rule->backend_count = 0;
|
|
rule->current_index = 0;
|
|
|
|
cocoon_proxy_backend_t *backend = &rule->backends[rule->backend_count];
|
|
parse_backend_url(target_url, backend);
|
|
rule->backend_count++;
|
|
|
|
log_info("添加代理规则: %s -> %s://%s:%d%s",
|
|
rule->path_prefix,
|
|
backend->target_https ? "https" : "http",
|
|
backend->target_host,
|
|
backend->target_port,
|
|
backend->target_path);
|
|
|
|
cfg->count++;
|
|
return true;
|
|
}
|
|
|
|
cocoon_proxy_rule_t *proxy_match(cocoon_proxy_config_t *cfg, const char *path) {
|
|
if (!cfg || !path) return NULL;
|
|
|
|
for (size_t i = 0; i < cfg->count; i++) {
|
|
cocoon_proxy_rule_t *rule = &cfg->rules[i];
|
|
size_t prefix_len = strlen(rule->path_prefix);
|
|
if (strncmp(path, rule->path_prefix, prefix_len) == 0) {
|
|
return rule;
|
|
}
|
|
}
|
|
return NULL;
|
|
}
|
|
|
|
/**
|
|
* proxy_connect_backend - 连接到指定后端
|
|
*/
|
|
static cocoon_socket_t proxy_connect_backend(const cocoon_proxy_backend_t *backend) {
|
|
struct hostent *host = gethostbyname(backend->target_host);
|
|
if (!host) {
|
|
log_error("无法解析主机: %s", backend->target_host);
|
|
return COCOON_INVALID_SOCKET;
|
|
}
|
|
|
|
cocoon_socket_t fd = socket(AF_INET, SOCK_STREAM, 0);
|
|
if (fd == COCOON_INVALID_SOCKET) {
|
|
log_error("创建 socket 失败");
|
|
return COCOON_INVALID_SOCKET;
|
|
}
|
|
|
|
struct sockaddr_in addr;
|
|
memset(&addr, 0, sizeof(addr));
|
|
addr.sin_family = AF_INET;
|
|
addr.sin_port = htons(backend->target_port);
|
|
memcpy(&addr.sin_addr, host->h_addr_list[0], (size_t)host->h_length);
|
|
|
|
if (connect(fd, (struct sockaddr *)&addr, sizeof(addr)) != 0) {
|
|
log_warn("连接后端失败: %s:%d", backend->target_host, backend->target_port);
|
|
cocoon_socket_close(fd);
|
|
return COCOON_INVALID_SOCKET;
|
|
}
|
|
|
|
return fd;
|
|
}
|
|
|
|
/**
|
|
* proxy_build_forwarded_path - 构建转发路径
|
|
*/
|
|
static void proxy_build_forwarded_path(const cocoon_proxy_rule_t *rule,
|
|
const cocoon_proxy_backend_t *backend,
|
|
const char *original_path,
|
|
char *out, size_t out_len) {
|
|
size_t prefix_len = strlen(rule->path_prefix);
|
|
const char *remaining = original_path + prefix_len;
|
|
|
|
if (backend->target_path[0] == '\0') {
|
|
/* 无目标路径前缀，直接转发剩余部分 */
|
|
if (remaining[0] == '\0') {
|
|
strncpy(out, "/", out_len - 1);
|
|
} else {
|
|
strncpy(out, remaining, out_len - 1);
|
|
}
|
|
} else {
|
|
/* 将目标路径前缀 + 剩余路径拼接 */
|
|
int n = snprintf(out, out_len, "%s%s", backend->target_path, remaining);
|
|
if (n < 0 || (size_t)n >= out_len) {
|
|
out[out_len - 1] = '\0';
|
|
}
|
|
}
|
|
out[out_len - 1] = '\0';
|
|
}
|
|
|
|
/**
|
|
* proxy_build_xff - 构建 X-Forwarded-For 值
|
|
*/
|
|
static void proxy_build_xff(const struct sockaddr_storage *client_addr,
|
|
char *out, size_t out_len) {
|
|
if (client_addr->ss_family == AF_INET) {
|
|
struct sockaddr_in *sin = (struct sockaddr_in *)client_addr;
|
|
inet_ntop(AF_INET, &sin->sin_addr, out, (socklen_t)out_len);
|
|
} else if (client_addr->ss_family == AF_INET6) {
|
|
struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *)client_addr;
|
|
inet_ntop(AF_INET6, &sin6->sin6_addr, out, (socklen_t)out_len);
|
|
} else {
|
|
strncpy(out, "unknown", out_len - 1);
|
|
out[out_len - 1] = '\0';
|
|
}
|
|
}
|
|
|
|
/**
|
|
* send_all_fd - 确保数据全部发送
|
|
*/
|
|
static int send_all_fd(cocoon_socket_t fd, const char *data, size_t len) {
|
|
size_t sent = 0;
|
|
while (sent < len) {
|
|
ssize_t n = send(fd, data + sent, len - sent, 0);
|
|
if (n < 0) {
|
|
if (errno == EAGAIN || errno == EINTR) continue;
|
|
return -1;
|
|
}
|
|
if (n == 0) return -1;
|
|
sent += (size_t)n;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* proxy_send_all_tls - 通过 TLS 连接发送全部数据
|
|
*/
|
|
static int proxy_send_all_tls(proxy_tls_conn_t *conn, const char *data, size_t len) {
|
|
size_t sent = 0;
|
|
while (sent < len) {
|
|
ssize_t n = proxy_tls_write(conn, data + sent, len - sent);
|
|
if (n > 0) {
|
|
sent += (size_t)n;
|
|
} else if (n < 0) {
|
|
if (errno == EAGAIN || errno == EINTR) continue;
|
|
return -1;
|
|
} else {
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
bool proxy_forward(cocoon_socket_t client_fd, const http_request_t *req,
|
|
cocoon_proxy_rule_t *rule,
|
|
const struct sockaddr_storage *client_addr) {
|
|
if (!rule || rule->backend_count == 0) {
|
|
log_error("代理规则无后端");
|
|
return false;
|
|
}
|
|
|
|
/* 轮询起始索引 */
|
|
size_t start_idx = rule->current_index;
|
|
size_t tried = 0;
|
|
bool success = false;
|
|
|
|
while (tried < rule->backend_count) {
|
|
size_t idx = (start_idx + tried) % rule->backend_count;
|
|
cocoon_proxy_backend_t *backend = &rule->backends[idx];
|
|
|
|
cocoon_socket_t backend_fd = COCOON_INVALID_SOCKET;
|
|
proxy_tls_conn_t *tls_conn = NULL;
|
|
bool use_https = backend->target_https;
|
|
|
|
if (use_https) {
|
|
tls_conn = proxy_tls_connect(backend->target_host, backend->target_port);
|
|
if (!tls_conn) {
|
|
log_warn("后端 %s:%d 连接失败，尝试下一个", backend->target_host, backend->target_port);
|
|
tried++;
|
|
continue;
|
|
}
|
|
} else {
|
|
backend_fd = proxy_connect_backend(backend);
|
|
if (backend_fd == COCOON_INVALID_SOCKET) {
|
|
log_warn("后端 %s:%d 连接失败，尝试下一个", backend->target_host, backend->target_port);
|
|
tried++;
|
|
continue;
|
|
}
|
|
}
|
|
|
|
/* 构建转发路径 */
|
|
char forwarded_path[512];
|
|
proxy_build_forwarded_path(rule, backend, req->path, forwarded_path, sizeof(forwarded_path));
|
|
|
|
/* 构建 X-Forwarded-For */
|
|
char xff[64];
|
|
proxy_build_xff(client_addr, xff, sizeof(xff));
|
|
|
|
/* 构建转发请求 */
|
|
char request_buf[4096];
|
|
int n = snprintf(request_buf, sizeof(request_buf),
|
|
"%s %s HTTP/1.1\r\n"
|
|
"Host: %s:%d\r\n"
|
|
"X-Forwarded-For: %s\r\n"
|
|
"X-Forwarded-Proto: %s\r\n"
|
|
"Connection: close\r\n",
|
|
http_method_str(req->method),
|
|
forwarded_path,
|
|
backend->target_host,
|
|
backend->target_port,
|
|
xff,
|
|
use_https ? "https" : "http");
|
|
|
|
/* 透传常见请求头 */
|
|
if (req->content_type[0] != '\0') {
|
|
n += snprintf(request_buf + n, sizeof(request_buf) - n,
|
|
"Content-Type: %s\r\n", req->content_type);
|
|
}
|
|
if (req->content_length > 0) {
|
|
n += snprintf(request_buf + n, sizeof(request_buf) - n,
|
|
"Content-Length: %ld\r\n", (long)req->content_length);
|
|
}
|
|
|
|
n += snprintf(request_buf + n, sizeof(request_buf) - n, "\r\n");
|
|
|
|
/* 发送请求头 */
|
|
bool send_ok = true;
|
|
if (use_https) {
|
|
if (proxy_send_all_tls(tls_conn, request_buf, (size_t)n) != 0) {
|
|
log_warn("转发请求头到 HTTPS 后端失败: %s:%d", backend->target_host, backend->target_port);
|
|
send_ok = false;
|
|
}
|
|
} else {
|
|
if (send_all_fd(backend_fd, request_buf, (size_t)n) != 0) {
|
|
log_warn("转发请求头到后端失败: %s:%d", backend->target_host, backend->target_port);
|
|
send_ok = false;
|
|
}
|
|
}
|
|
|
|
/* 发送请求体 */
|
|
if (send_ok && req->body && req->body_len > 0) {
|
|
if (use_https) {
|
|
if (proxy_send_all_tls(tls_conn, req->body, req->body_len) != 0) {
|
|
log_warn("转发请求体到 HTTPS 后端失败");
|
|
send_ok = false;
|
|
}
|
|
} else {
|
|
if (send_all_fd(backend_fd, req->body, req->body_len) != 0) {
|
|
log_warn("转发请求体到后端失败");
|
|
send_ok = false;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* 流式转发响应回客户端 */
|
|
if (send_ok) {
|
|
char relay_buf[8192];
|
|
ssize_t total_forwarded = 0;
|
|
bool recv_ok = true;
|
|
while (1) {
|
|
ssize_t r;
|
|
if (use_https) {
|
|
r = proxy_tls_read(tls_conn, relay_buf, sizeof(relay_buf));
|
|
} else {
|
|
r = recv(backend_fd, relay_buf, sizeof(relay_buf), 0);
|
|
}
|
|
if (r < 0) {
|
|
if (errno == EAGAIN || errno == EINTR) continue;
|
|
recv_ok = false;
|
|
break;
|
|
}
|
|
if (r == 0) break;
|
|
|
|
if (send_all_fd(client_fd, relay_buf, (size_t)r) != 0) {
|
|
log_error("转发响应到客户端失败");
|
|
recv_ok = false;
|
|
break;
|
|
}
|
|
total_forwarded += r;
|
|
}
|
|
|
|
if (recv_ok) {
|
|
log_debug("代理完成: %s -> 后端[%zu] %s:%d%s, 转发 %zd bytes",
|
|
req->path, idx, backend->target_host, backend->target_port,
|
|
forwarded_path, total_forwarded);
|
|
success = true;
|
|
}
|
|
}
|
|
|
|
/* 清理后端连接 */
|
|
if (use_https) {
|
|
proxy_tls_close(tls_conn);
|
|
} else {
|
|
cocoon_socket_close(backend_fd);
|
|
}
|
|
|
|
if (success) {
|
|
/* 轮询指针前移 */
|
|
rule->current_index = (idx + 1) % rule->backend_count;
|
|
return req->keep_alive;
|
|
}
|
|
|
|
tried++;
|
|
}
|
|
|
|
log_error("所有后端均不可用: %s", rule->path_prefix);
|
|
return false;
|
|
}
|