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214 lines
6.8 KiB
C
214 lines
6.8 KiB
C
/*
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* Copyright (c) 2012 Tristan Le Guern <leguern AT medu DOT se>
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*
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* Permission to use, copy, modify, and distribute this software for any
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* purpose with or without fee is hereby granted, provided that the above
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* copyright notice and this permission notice appear in all copies.
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*
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* Copyright (c) 2016 Mahdi Mokhtari <mokhi64@gmail.com>
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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* WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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* MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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* ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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* WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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* ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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* OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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*/
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#include <sys/types.h>
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#if defined Windows
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# include <In6addr.h>
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#else /* Unix */
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# include <sys/socket.h>
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#endif
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#if !defined Windows /* Unix :) */
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# if defined Linux
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# include <linux/if.h>
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# else
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# include <net/if.h>
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# endif
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# include <netinet/in.h>
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# include <netinet/if_ether.h>
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#endif
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#include <stdint.h>
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#ifndef LIBTUNTAP_H_
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# define LIBTUNTAP_H_
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/*
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* Uniformize macros
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* - ETHER_ADDR_LEN: Magic number from IEEE 802.3
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* - IF_NAMESIZE: Length of interface external name
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* - IF_DESCRSIZE: Length of interface description
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* - TUNSDEBUG: ioctl flag to enable the debug mode of a tun device
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* - TUNFD_INVALID_VALUE: Invalid value for tun_fd
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*/
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# if defined ETH_ALEN /* Linux */
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# define ETHER_ADDR_LEN ETH_ALEN
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# elif defined Windows
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# define ETHER_ADDR_LEN 6
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# endif
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# if defined IFNAMSIZ && !defined IF_NAMESIZE
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# define IF_NAMESIZE IFNAMSIZ /* Historical BSD name */
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# elif !defined IF_NAMESIZE
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# define IF_NAMESIZE 16
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# endif
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# define IF_DESCRSIZE 50 /* XXX: Tests needed on NetBSD and OpenBSD */
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# if defined TUNSETDEBUG
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# define TUNSDEBUG TUNSETDEBUG
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# endif
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# if defined Windows
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# define TUNFD_INVALID_VALUE INVALID_HANDLE_VALUE
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# else /* Unix */
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# define TUNFD_INVALID_VALUE -1
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# endif
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/*
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* Uniformize types
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* - t_tun: tun device file descriptor
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* - t_tun_in_addr: struct in_addr/IN_ADDR
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* - t_tun_in6_addr: struct in6_addr/IN6_ADDR
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*/
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# if defined Windows
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typedef HANDLE t_tun;
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typedef IN_ADDR t_tun_in_addr;
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typedef IN6_ADDR t_tun_in6_addr;
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# else /* Unix */
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typedef int t_tun;
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typedef struct in_addr t_tun_in_addr;
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typedef struct in6_addr t_tun_in6_addr;
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# endif
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/*
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* Windows helpers
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*/
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# if defined Windows
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# define snprintf(x, y, z, ...) _snprintf_s((x), (y), (y), (z), __VA_ARGS__);
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# define strncat(x, y, z) strncat_s((x), _countof(x), (y), (z));
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# define strdup(x) _strdup(x)
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# endif
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# define TUNTAP_ID_MAX 256
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# define TUNTAP_ID_ANY 257
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# define TUNTAP_MODE_ETHERNET 0x0001
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# define TUNTAP_MODE_TUNNEL 0x0002
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# define TUNTAP_MODE_PERSIST 0x0004
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# define TUNTAP_LOG_NONE 0x0000
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# define TUNTAP_LOG_DEBUG 0x0001
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# define TUNTAP_LOG_INFO 0x0002
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# define TUNTAP_LOG_NOTICE 0x0004
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# define TUNTAP_LOG_WARN 0x0008
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# define TUNTAP_LOG_ERR 0x0016
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/* Versioning: 0xMMmm, with 'M' for major and 'm' for minor */
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# define TUNTAP_VERSION_MAJOR 0
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# define TUNTAP_VERSION_MINOR 3
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# define TUNTAP_VERSION ((TUNTAP_VERSION_MAJOR<<8)|TUNTAP_VERSION_MINOR)
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# define TUNTAP_GET_FD(x) (x)->tun_fd
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/* Handle Windows symbols export */
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# if defined Windows
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# if defined(tuntap_EXPORTS) /* CMake generated goo */
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# define TUNTAP_EXPORT __declspec(dllexport)
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# else
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# define TUNTAP_EXPORT __declspec(dllimport)
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# endif
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# else /* Unix */
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# define TUNTAP_EXPORT
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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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struct device {
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t_tun tun_fd;
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int ctrl_sock;
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int flags; /* ifr.ifr_flags on Unix */
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unsigned char hwaddr[ETHER_ADDR_LEN];
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char if_name[IF_NAMESIZE];
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#if defined(FreeBSD)
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int mode;
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#endif
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};
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/* User definable log callback */
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typedef void (*t_tuntap_log)(int, const char *);
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TUNTAP_EXPORT t_tuntap_log tuntap_log;
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/* Portable "public" functions */
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TUNTAP_EXPORT struct device *tuntap_init(void);
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TUNTAP_EXPORT int tuntap_version(void);
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TUNTAP_EXPORT void tuntap_destroy(struct device *);
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TUNTAP_EXPORT void tuntap_release(struct device *);
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TUNTAP_EXPORT int tuntap_start(struct device *, int, int);
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TUNTAP_EXPORT char *tuntap_get_ifname(struct device *);
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TUNTAP_EXPORT int tuntap_set_ifname(struct device *, const char *);
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TUNTAP_EXPORT char *tuntap_get_hwaddr(struct device *);
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TUNTAP_EXPORT int tuntap_set_hwaddr(struct device *, const char *);
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TUNTAP_EXPORT int tuntap_set_descr(struct device *, const char *);
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TUNTAP_EXPORT int tuntap_up(struct device *);
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TUNTAP_EXPORT int tuntap_down(struct device *);
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TUNTAP_EXPORT int tuntap_get_mtu(struct device *);
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TUNTAP_EXPORT int tuntap_set_mtu(struct device *, int);
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/*
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* It's impossible to set single IP for `tun` devices on FreeBSD .
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* FreeBSD's `tun` interface needs 2 IP addresses.
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* So a new (and backward compatible) version of tuntap_set_ip() is implemented.
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*/
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TUNTAP_EXPORT int tuntap_set_ip(struct device *, ...);
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//TUNTAP_EXPORT int tuntap_set_ip_old(struct device *, const char *, int);
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/*TUNTAP_EXPORT int tuntap_set_ip_old(struct device *, const char *, int);*/
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TUNTAP_EXPORT int tuntap_read(struct device *, void *, size_t);
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TUNTAP_EXPORT int tuntap_write(struct device *, void *, size_t);
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TUNTAP_EXPORT int tuntap_get_readable(struct device *);
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TUNTAP_EXPORT int tuntap_set_nonblocking(struct device *dev, int);
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TUNTAP_EXPORT int tuntap_set_debug(struct device *dev, int);
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/* Logging functions */
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TUNTAP_EXPORT void tuntap_log_set_cb(t_tuntap_log cb);
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void tuntap_log_default(int, const char *);
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void tuntap_log_hexdump(void *, size_t);
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void tuntap_log_chksum(void *, int);
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/* OS specific functions */
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int tuntap_sys_start(struct device *, int, int);
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void tuntap_sys_destroy(struct device *);
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int tuntap_sys_set_hwaddr(struct device *, struct ether_addr *);
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int tuntap_sys_set_ipv4(struct device *, t_tun_in_addr *, uint32_t);
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#if defined(FreeBSD)
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int tuntap_sys_set_ipv4_tap(struct device *, t_tun_in_addr *, uint32_t);
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int tuntap_sys_set_ipv4_tun(struct device *dev, t_tun_in_addr *s4, t_tun_in_addr *s4dest, uint32_t bits);
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#endif
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int tuntap_sys_set_ipv6(struct device *, t_tun_in6_addr *, uint32_t);
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int tuntap_sys_set_ifname(struct device *, const char *, size_t);
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int tuntap_sys_set_descr(struct device *, const char *, size_t);
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# ifdef __cplusplus
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}
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# endif
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#endif
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