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lokinet/include/tuntap.h
Stephen Shelton 273270916e
The Great Wall of Blame 
This commit reflects changes to clang-format rules. Unfortunately,
these rule changes create a massive change to the codebase, which
causes an apparent rewrite of git history.

Git blame's --ignore-rev flag can be used to ignore this commit when
attempting to `git blame` some code.
2020-04-07 12:38:56 -06:00

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/*
* Copyright (c) 2012 Tristan Le Guern <leguern AT medu DOT se>
*
* Permission to use, copy, modify, and distribute this software for any
* purpose with or without fee is hereby granted, provided that the above
* copyright notice and this permission notice appear in all copies.
*
* Copyright (c) 2016 Mahdi Mokhtari <mokhi64@gmail.com>
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
*/
#include <sys/types.h>
#if defined Windows
#else /* Unix */
#include <sys/socket.h>
#endif
#if !defined Windows /* Unix :) */
#if !defined Linux
#include <netinet/in.h>
#endif
#if defined(Linux)
// Once we drop xenial support we can just include net/if.h on linux
#include <linux/if.h>
#else
#include <net/if.h>
#endif
#if defined Linux
#include <netinet/in.h>
#elif defined(iOS)
#include <net/ethernet.h>
#else
#include <netinet/if_ether.h>
#endif
#endif
#include <stdint.h>
#ifndef LIBTUNTAP_H_
#define LIBTUNTAP_H_
#if defined IFNAMSIZ && !defined IF_NAMESIZE
#define IF_NAMESIZE IFNAMSIZ /* Historical BSD name */
#elif !defined IF_NAMESIZE
#define IF_NAMESIZE 16
#endif
#define IF_DESCRSIZE 50 /* XXX: Tests needed on NetBSD and OpenBSD */
#if defined TUNSETDEBUG
#define TUNSDEBUG TUNSETDEBUG
#endif
#if defined Windows
#define TUNFD_INVALID_VALUE INVALID_HANDLE_VALUE
#else /* Unix */
#define TUNFD_INVALID_VALUE -1
#endif
/*
* Uniformize types
* - t_tun: tun device file descriptor
* - t_tun_in_addr: struct in_addr/IN_ADDR
* - t_tun_in6_addr: struct in6_addr/IN6_ADDR
*/
#if defined Windows
#include <windows.h>
#include <in6addr.h>
#include <winsock2.h>
typedef HANDLE t_tun;
typedef IN_ADDR t_tun_in_addr;
typedef IN6_ADDR t_tun_in6_addr;
#else /* Unix */
typedef int t_tun;
typedef struct in_addr t_tun_in_addr;
typedef struct in6_addr t_tun_in6_addr;
#endif
/*
* Windows helpers
*/
#if defined Windows
//#define strncat(x, y, z) strncat_s((x), _countof(x), (y), (z));
#define strdup(x) _strdup(x)
#endif
#define TUNTAP_ID_MAX 256
#define TUNTAP_ID_ANY 257
#define TUNTAP_MODE_ETHERNET 0x0001
#define TUNTAP_MODE_TUNNEL 0x0002
#define TUNTAP_MODE_PERSIST 0x0004
#define TUNTAP_LOG_NONE 0x0000
#define TUNTAP_LOG_DEBUG 0x0001
#define TUNTAP_LOG_INFO 0x0002
#define TUNTAP_LOG_NOTICE 0x0004
#define TUNTAP_LOG_WARN 0x0008
#define TUNTAP_LOG_ERR 0x0016
/* Versioning: 0xMMmm, with 'M' for major and 'm' for minor */
#define TUNTAP_VERSION_MAJOR 0
#define TUNTAP_VERSION_MINOR 3
#define TUNTAP_VERSION ((TUNTAP_VERSION_MAJOR << 8) | TUNTAP_VERSION_MINOR)
#define TUNTAP_GET_FD(x) (x)->tun_fd
/* Handle Windows symbols export */
#if defined Windows
#if defined(tuntap_EXPORTS) && defined(_USRDLL) /* CMake generated goo */
#define TUNTAP_EXPORT __declspec(dllexport)
#elif defined(tuntap_EXPORTS)
#define TUNTAP_EXPORT __declspec(dllimport)
#else
#define TUNTAP_EXPORT extern
#endif
#else /* Unix */
#define TUNTAP_EXPORT extern
#endif
#ifdef __cplusplus
extern "C"
{
#endif
struct device
{
/** set me on ios and android to block on a promise for the fd */
int (*obtain_fd)(struct device*);
/** user data */
void* user;
t_tun tun_fd;
int ctrl_sock;
int flags; /* ifr.ifr_flags on Unix */
char if_name[IF_NAMESIZE];
#if defined(Windows)
int idx; /* needed to set ipv6 address */
DWORD bindaddr; /* set DNS client address */
#endif
#if defined(FreeBSD)
int mode;
#endif
#if defined(__sun)
int ip_fd;
int reserved;
char internal_name[IF_NAMESIZE];
#endif
};
/* User definable log callback */
typedef void (*t_tuntap_log)(int, int, const char*, const char*);
TUNTAP_EXPORT t_tuntap_log __tuntap_log;
#ifndef LOG_TAG
#define LOG_TAG "tuntap"
#endif
#define tuntap_log(lvl, msg) __tuntap_log(lvl, __LINE__, LOG_TAG, msg)
/* Portable "public" functions */
TUNTAP_EXPORT struct device*
tuntap_init(void);
TUNTAP_EXPORT int
tuntap_version(void);
TUNTAP_EXPORT void
tuntap_destroy(struct device*);
TUNTAP_EXPORT void
tuntap_release(struct device*);
TUNTAP_EXPORT int
tuntap_start(struct device*, int, int);
TUNTAP_EXPORT char*
tuntap_get_ifname(struct device*);
TUNTAP_EXPORT int
tuntap_set_ifname(struct device*, const char*);
TUNTAP_EXPORT int
tuntap_set_descr(struct device*, const char*);
TUNTAP_EXPORT int
tuntap_up(struct device*);
TUNTAP_EXPORT int
tuntap_down(struct device*);
TUNTAP_EXPORT int
tuntap_get_mtu(struct device*);
TUNTAP_EXPORT int
tuntap_set_mtu(struct device*, int);
/** set ip address and netmask
*/
TUNTAP_EXPORT int
tuntap_set_ip(struct device*, const char* srcaddr, const char* dstaddr, int netmask);
// TUNTAP_EXPORT int tuntap_set_ip_old(struct device *, const char
// *, int);
/*TUNTAP_EXPORT int tuntap_set_ip_old(struct device *, const char
* *, int);*/
TUNTAP_EXPORT int
tuntap_read(struct device*, void*, size_t);
TUNTAP_EXPORT int
tuntap_write(struct device*, void*, size_t);
TUNTAP_EXPORT int
tuntap_get_readable(struct device*);
TUNTAP_EXPORT int
tuntap_set_nonblocking(struct device* dev, int);
TUNTAP_EXPORT int
tuntap_set_debug(struct device* dev, int);
/* Logging functions */
TUNTAP_EXPORT void
tuntap_log_set_cb(t_tuntap_log cb);
void
tuntap_log_default(int, int, const char*, const char*);
void
tuntap_log_hexdump(void*, size_t);
void
tuntap_log_chksum(void*, int);
/* OS specific functions */
int
tuntap_sys_start(struct device*, int, int);
void
tuntap_sys_destroy(struct device*);
int
tuntap_sys_set_ipv4(struct device*, t_tun_in_addr*, uint32_t);
#if defined(Windows)
int
tuntap_sys_set_dns(struct device* dev, t_tun_in_addr* s, uint32_t mask);
#endif
#if defined(FreeBSD)
int
tuntap_sys_set_ipv4_tap(struct device*, t_tun_in_addr*, uint32_t);
int
tuntap_sys_set_ipv4_tun(
struct device* dev, t_tun_in_addr* s4, t_tun_in_addr* s4dest, uint32_t bits, int netmask);
#endif
int
tuntap_sys_set_ipv6(struct device*, t_tun_in6_addr*, uint32_t);
int
tuntap_sys_set_ifname(struct device*, const char*, size_t);
int
tuntap_sys_set_descr(struct device*, const char*, size_t);
#ifdef __cplusplus
}
#endif
#endif
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