mirror of
https://github.com/shadowsocks/shadowsocks-libev.git
synced 2026-10-23 08:03:54 +00:00
Max Lv
537bc77e79
Wrap the declarations of every project header in extern "C" (after the system includes, which must keep C++ linkage), so converted modules and the remaining C files agree on linkage. In the leaf modules, cast allocator and memchr results explicitly, rename identifiers called new, replace the getpwnam_r VLA with the fixed 16 KiB buffer the loop already capped itself at, and make the rlimit initialiser conversion explicit. All of this is still valid C.
139 lines
3.7 KiB
C
139 lines
3.7 KiB
C
/*
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* netutils.h - Network utilities
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*
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* Copyright (C) 2013 - 2019, Max Lv <max.c.lv@gmail.com>
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*
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* This file is part of the shadowsocks-libev.
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*
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* shadowsocks-libev is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 3 of the License, or
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* (at your option) any later version.
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*
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* shadowsocks-libev is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with shadowsocks-libev; see the file COPYING. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#ifndef _NETUTILS_H
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#define _NETUTILS_H
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#include "platform.h"
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#ifdef __MINGW32__
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#include "ss_windows.h"
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#else
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#include <sys/socket.h>
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#include <netinet/in.h>
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#endif
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#if defined(HAVE_LINUX_TCP_H)
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#include <linux/tcp.h>
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#elif defined(HAVE_NETINET_TCP_H)
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#include <netinet/tcp.h>
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#elif defined(HAVE_NETDB_H)
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#include <netdb.h>
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#endif
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* Hard coded defines for TCP fast open on Android */
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#ifdef __ANDROID__
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#ifndef TCP_FASTOPEN
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#define TCP_FASTOPEN 23
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#endif
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#ifndef MSG_FASTOPEN
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#define MSG_FASTOPEN 0x20000000
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#endif
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#ifdef TCP_FASTOPEN_CONNECT
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#undef TCP_FASTOPEN_CONNECT
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#endif
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#endif
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#define MAX_HOSTNAME_LEN 256 // FQCN <= 255 characters
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#define MAX_PORT_STR_LEN 6 // PORT < 65536
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#define SOCKET_BUF_SIZE (16 * 1024 - 1) // 16383 Byte, equals to the max chunk size
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typedef struct {
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char *host;
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char *port;
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} ss_addr_t;
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// Be compatible with older libc.
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#ifndef IPPROTO_MPTCP
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#define IPPROTO_MPTCP 262
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#endif
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/* MPTCP_ENABLED setsockopt values for out-of-tree kernel 4 & 3, best behaviour
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* to be independent of kernel version is to test from newest to latest values.
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*/
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#ifndef MPTCP_ENABLED
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static const char mptcp_enabled_values[] = { 42, 26, 0 };
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#else
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static const char mptcp_enabled_values[] = { MPTCP_ENABLED, 0 };
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#endif
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#ifndef UPDATE_INTERVAL
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#define UPDATE_INTERVAL 5
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#endif
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/** byte size of ip4 address */
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#define INET_SIZE 4
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/** byte size of ip6 address */
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#define INET6_SIZE 16
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int parse_numeric_port(const char *port, uint16_t *port_out);
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size_t get_sockaddr_len(struct sockaddr *addr);
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ssize_t get_sockaddr(char *host, char *port,
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struct sockaddr_storage *storage, int block,
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int ipv6first);
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int set_reuseport(int socket);
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#ifdef SET_INTERFACE
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int setinterface(int socket_fd, const char *interface_name);
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#endif
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int parse_local_addr(struct sockaddr_storage *storage_v4,
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struct sockaddr_storage *storage_v6,
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const char *host);
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int bind_to_addr(struct sockaddr_storage *storage, int socket_fd);
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/**
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* Compare two sockaddrs. Imposes an ordering on the addresses.
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* Compares address and port.
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* @param addr1: address 1.
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* @param addr2: address 2.
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* @param len: lengths of addr.
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* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
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*/
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int sockaddr_cmp(struct sockaddr_storage *addr1,
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struct sockaddr_storage *addr2, socklen_t len);
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/**
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* Compare two sockaddrs. Compares address, not the port.
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* @param addr1: address 1.
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* @param addr2: address 2.
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* @param len: lengths of addr.
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* @return: 0 if addr1 == addr2. -1 if addr1 is smaller, +1 if larger.
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*/
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int sockaddr_cmp_addr(struct sockaddr_storage *addr1,
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struct sockaddr_storage *addr2, socklen_t len);
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int validate_hostname(const char *hostname, const int hostname_len);
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int is_ipv6only(ss_addr_t *servers, size_t server_num, int ipv6first);
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#ifdef __cplusplus
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}
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#endif
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#endif
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