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author | Lorenzo Colitti <lorenzo@google.com> | 2014-12-08 11:27:41 +0900 |
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committer | Lorenzo Colitti <lorenzo@google.com> | 2014-12-08 12:38:20 +0900 |
commit | ff6f7fe4bd983c623d490100fa17cdb4936b95a2 (patch) | |
tree | 1d93045184b4d6fb67b1799e89b6fcacdbd948c8 /tun.c | |
parent | 30588552f63424bd4bdbf5ebdce8ba63d10a7bb2 (diff) | |
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Move tun functions to a new tun.c.
Change-Id: I4910b6cfca0bbf6bde2d1348f43d3131a1212399
Diffstat (limited to 'tun.c')
-rw-r--r-- | tun.c | 62 |
1 files changed, 62 insertions, 0 deletions
@@ -0,0 +1,62 @@ +/* + * Copyright 2014 The Android Open Source Project + * + * Licensed under the Apache License, Version 2.0 (the "License"); + * you may not use this file except in compliance with the License. + * You may obtain a copy of the License at + * + * http://www.apache.org/licenses/LICENSE-2.0 + * + * Unless required by applicable law or agreed to in writing, software + * distributed under the License is distributed on an "AS IS" BASIS, + * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. + * See the License for the specific language governing permissions and + * limitations under the License. + * + * tun.c - tun device functions + */ +#include <fcntl.h> +#include <string.h> +#include <unistd.h> +#include <arpa/inet.h> +#include <linux/if.h> +#include <linux/if_tun.h> +#include <sys/ioctl.h> + +/* function: tun_open + * tries to open the tunnel device + */ +int tun_open() { + int fd; + + fd = open("/dev/tun", O_RDWR); + if(fd < 0) { + fd = open("/dev/net/tun", O_RDWR); + } + + return fd; +} + +/* function: tun_alloc + * creates a tun interface and names it + * dev - the name for the new tun device + */ +int tun_alloc(char *dev, int fd) { + struct ifreq ifr; + int err; + + memset(&ifr, 0, sizeof(ifr)); + + ifr.ifr_flags = IFF_TUN; + if( *dev ) { + strncpy(ifr.ifr_name, dev, IFNAMSIZ); + ifr.ifr_name[IFNAMSIZ-1] = '\0'; + } + + if( (err = ioctl(fd, TUNSETIFF, (void *) &ifr)) < 0 ){ + close(fd); + return err; + } + strcpy(dev, ifr.ifr_name); + return 0; +} |