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/* Copyright (C) CZ.NIC, z.s.p.o. <knot-resolver@labs.nic.cz>
* SPDX-License-Identifier: GPL-3.0-or-later
*/
#pragma once
#include <stdint.h>
#include "lib/utils.h"
struct network;
struct session;
extern const char PROXY2_SIGNATURE[12];
#define PROXY2_MIN_SIZE 16
enum proxy2_command {
PROXY2_CMD_LOCAL = 0x0,
PROXY2_CMD_PROXY = 0x1
};
/** Parsed result of the PROXY protocol */
struct proxy_result {
/** Proxy command - PROXY or LOCAL. */
enum proxy2_command command;
/** Address family from netinet library (e.g. AF_INET6). */
int family;
/** Protocol type from socket library (e.g. SOCK_STREAM). */
int protocol;
/** Parsed source address and port. */
union kr_sockaddr src_addr;
/** Parsed destination address and port. */
union kr_sockaddr dst_addr;
/** `true` = client has used TLS with the proxy. If TLS padding is
* enabled, it will be used even if the communication between kresd and
* the proxy is unencrypted. */
bool has_tls : 1;
};
/** Checks for a PROXY protocol version 2 signature in the specified buffer. */
static inline bool proxy_header_present(const void* buf, const ssize_t nread)
{
return nread >= PROXY2_MIN_SIZE &&
memcmp(buf, PROXY2_SIGNATURE, sizeof(PROXY2_SIGNATURE)) == 0;
}
/** Checks whether the use of PROXYv2 protocol is allowed for the specified
* address. */
bool proxy_allowed(const struct network *net, const struct sockaddr *saddr);
/** Parses the PROXYv2 header from buf of size nread and writes the result into
* out. The rest of the buffer is moved to free bytes of the specified session's
* wire buffer. The function assumes that the PROXYv2 signature is present
* and has been already checked by the caller (like `udp_recv` or `tcp_recv`). */
ssize_t proxy_process_header(struct proxy_result *out, struct session *s,
const void *buf, ssize_t nread);
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