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369 lines
7.4 KiB
C
369 lines
7.4 KiB
C
/*
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* Copyright (c) 2012 Tristan Le Guern <tleguern@bouledef.eu>
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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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#ifdef __sun
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#define BSD_COMP
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#define TUNSDEBUG _IOW('t', 90, int)
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#endif
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <sys/types.h>
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#include <arpa/inet.h>
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#include <netinet/in.h>
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#if defined Linux
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#include <netinet/ether.h>
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#include <linux/if_tun.h>
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#else
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#include <net/if.h>
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#if defined DragonFly
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#include <net/tun/if_tun.h>
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#elif !defined Darwin
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#include <net/if_tun.h>
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#endif
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#include <netinet/if_ether.h>
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#include <netinet/in.h>
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <time.h>
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#include <unistd.h>
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#include <tuntap.h>
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int
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tuntap_start(struct device *dev, int mode, int tun)
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{
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int sock;
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int fd;
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fd = sock = -1;
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/* Don't re-initialise a previously started device */
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if(dev->tun_fd != -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Device is already started");
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return -1;
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}
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if(sock == -1)
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{
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goto clean;
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}
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dev->ctrl_sock = sock;
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if(mode & TUNTAP_MODE_PERSIST && tun == TUNTAP_ID_ANY)
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{
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goto clean; /* XXX: Explain why */
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}
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fd = tuntap_sys_start(dev, mode, tun);
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if(fd == -1)
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{
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goto clean;
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}
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dev->tun_fd = fd;
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tuntap_set_debug(dev, 0);
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return 0;
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clean:
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if(fd != -1)
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{
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(void)close(fd);
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}
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if(sock != -1)
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{
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(void)close(sock);
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}
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return -1;
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}
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void
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tuntap_release(struct device *dev)
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{
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(void)close(dev->tun_fd);
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(void)close(dev->ctrl_sock);
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free(dev);
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}
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int
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tuntap_set_descr(struct device *dev, const char *descr)
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{
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size_t len;
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if(descr == NULL)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'descr'");
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return -1;
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}
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len = strlen(descr);
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if(len > IF_DESCRSIZE)
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{
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/* The value will be troncated */
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tuntap_log(TUNTAP_LOG_WARN, "Parameter 'descr' is too long");
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}
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if(tuntap_sys_set_descr(dev, descr, len) == -1)
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{
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return -1;
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}
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return 0;
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}
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int
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tuntap_set_ifname(struct device *dev, const char *ifname)
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{
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size_t len;
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if(ifname == NULL)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'ifname'");
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return -1;
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}
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len = strlen(ifname);
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if(len > IF_NAMESIZE)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Parameter 'ifname' is too long");
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return -1;
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}
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if(tuntap_sys_set_ifname(dev, ifname, len) == -1)
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{
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return -1;
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}
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(void)memset(dev->if_name, 0, IF_NAMESIZE);
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(void)strncpy(dev->if_name, ifname, len);
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return 0;
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}
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int
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tuntap_up(struct device *dev)
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{
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struct ifreq ifr;
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memcpy(ifr.ifr_name, dev->if_name, sizeof dev->if_name);
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ifr.ifr_flags = (short int)dev->flags;
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ifr.ifr_flags |= IFF_UP;
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if(ioctl(dev->ctrl_sock, SIOCSIFFLAGS, &ifr) == -1)
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{
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return -1;
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}
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dev->flags = ifr.ifr_flags;
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return 0;
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}
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int
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tuntap_down(struct device *dev)
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{
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struct ifreq ifr;
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memcpy(ifr.ifr_name, dev->if_name, sizeof dev->if_name);
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ifr.ifr_flags = (short)dev->flags;
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ifr.ifr_flags &= ~IFF_UP;
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if(ioctl(dev->ctrl_sock, SIOCSIFFLAGS, &ifr) == -1)
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{
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return -1;
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}
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dev->flags = ifr.ifr_flags;
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return 0;
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}
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int
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tuntap_get_mtu(struct device *dev)
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{
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struct ifreq ifr;
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/* Only accept started device */
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if(dev->tun_fd == -1)
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{
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tuntap_log(TUNTAP_LOG_NOTICE, "Device is not started");
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return 0;
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}
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memcpy(ifr.ifr_name, dev->if_name, sizeof dev->if_name);
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if(ioctl(dev->ctrl_sock, SIOCGIFMTU, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't get MTU");
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return -1;
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}
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return ifr.ifr_mtu;
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}
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int
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tuntap_set_mtu(struct device *dev, int mtu)
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{
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struct ifreq ifr;
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/* Only accept started device */
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if(dev->tun_fd == -1)
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{
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tuntap_log(TUNTAP_LOG_NOTICE, "Device is not started");
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return 0;
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}
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(void)memset(&ifr, '\0', sizeof ifr);
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(void)memcpy(ifr.ifr_name, dev->if_name, sizeof dev->if_name);
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ifr.ifr_mtu = mtu;
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if(ioctl(dev->ctrl_sock, SIOCSIFMTU, &ifr) == -1)
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{
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tuntap_log(TUNTAP_LOG_ERR, "Can't set MTU");
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return -1;
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}
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return 0;
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}
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int
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tuntap_read(struct device *dev, void *buf, size_t size)
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{
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int n;
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/* Only accept started device */
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if(dev->tun_fd == -1)
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{
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tuntap_log(TUNTAP_LOG_NOTICE, "Device is not started");
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return 0;
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}
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n = read(dev->tun_fd, buf, size);
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if(n == -1)
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{
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tuntap_log(TUNTAP_LOG_WARN, "Can't to read from device");
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return -1;
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}
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return n;
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}
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int
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tuntap_write(struct device *dev, void *buf, size_t size)
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{
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int n;
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/* Only accept started device */
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if(dev->tun_fd == -1)
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{
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tuntap_log(TUNTAP_LOG_NOTICE, "Device is not started");
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return 0;
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}
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n = write(dev->tun_fd, buf, size);
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if(n == -1)
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{
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tuntap_log(TUNTAP_LOG_WARN, "Can't write to device");
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return -1;
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}
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return n;
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}
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int
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tuntap_get_readable(struct device *dev)
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{
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int n;
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n = 0;
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if(ioctl(dev->tun_fd, FIONREAD, &n) == -1)
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{
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tuntap_log(TUNTAP_LOG_INFO,
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"Your system does not support"
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" FIONREAD, fallback to MTU");
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return tuntap_get_mtu(dev);
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}
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return n;
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}
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int
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tuntap_set_nonblocking(struct device *dev, int set)
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{
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if(ioctl(dev->tun_fd, FIONBIO, &set) == -1)
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{
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switch(set)
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{
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case 0:
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tuntap_log(TUNTAP_LOG_ERR, "Can't unset nonblocking");
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break;
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case 1:
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tuntap_log(TUNTAP_LOG_ERR, "Can't set nonblocking");
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break;
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default:
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'set'");
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}
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return -1;
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}
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return 0;
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}
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int
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tuntap_set_debug(struct device *dev, int set)
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{
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/* Only accept started device */
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if(dev->tun_fd == -1)
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{
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tuntap_log(TUNTAP_LOG_NOTICE, "Device is not started");
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return 0;
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}
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#if !defined Darwin
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if(ioctl(dev->tun_fd, TUNSDEBUG, &set) == -1)
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{
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switch(set)
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{
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case 0:
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tuntap_log(TUNTAP_LOG_WARN, "Can't unset debug");
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break;
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case 1:
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tuntap_log(TUNTAP_LOG_WARN, "Can't set debug");
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break;
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default:
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tuntap_log(TUNTAP_LOG_ERR, "Invalid parameter 'set'");
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}
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return -1;
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}
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return 0;
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#else
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(void)set;
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tuntap_log(TUNTAP_LOG_NOTICE,
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"Your system does not support tuntap_set_debug()");
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return -1;
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#endif
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}
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