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src/if-linux-wext.c
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/* SPDX-License-Identifier: BSD-2-Clause */ | |||||
/* | |||||
* dhcpcd - DHCP client daemon | |||||
* Copyright (c) 2009-2021 Roy Marples <roy@marples.name> | |||||
* All rights reserved | |||||
* 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. | |||||
* | |||||
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND | |||||
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE | |||||
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE | |||||
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE | |||||
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL | |||||
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS | |||||
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) | |||||
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT | |||||
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY | |||||
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF | |||||
* SUCH DAMAGE. | |||||
*/ | |||||
/* | |||||
* THIS IS A NASTY HACK THAT SHOULD NEVER HAVE HAPPENED | |||||
* Basically we cannot include linux/if.h and net/if.h because | |||||
* they have conflicting structures. | |||||
* Sadly, linux/wireless.h includes linux/if.h all the time. | |||||
* Some kernel-header installs fix this and some do not. | |||||
* This file solely exists for those who do not. | |||||
* | |||||
* We *could* include wireless.h as that is designed for userspace, | |||||
* but that then depends on the correct version of wireless-tools being | |||||
* installed which isn't always the case. | |||||
*/ | |||||
#include <sys/ioctl.h> | |||||
#include <sys/socket.h> | |||||
#include <linux/types.h> | |||||
#include <linux/rtnetlink.h> | |||||
/* Support older kernels */ | |||||
#ifdef IFLA_WIRELESS | |||||
# include <linux/if.h> | |||||
# include <linux/wireless.h> | |||||
#else | |||||
# define IFLA_WIRELESS (IFLA_MASTER + 1) | |||||
#endif | |||||
#include <string.h> | |||||
#include <unistd.h> | |||||
#include "config.h" | |||||
/* We can't include if.h or dhcpcd.h because | |||||
* they would pull in net/if.h, which defeats the purpose of this hack. */ | |||||
#define IF_SSIDLEN 32 | |||||
int if_getssid_wext(const char *ifname, uint8_t *ssid); | |||||
int | |||||
if_getssid_wext(const char *ifname, uint8_t *ssid) | |||||
{ | |||||
#ifdef SIOCGIWESSID | |||||
int s, retval; | |||||
struct iwreq iwr; | |||||
if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) | |||||
return -1; | |||||
memset(&iwr, 0, sizeof(iwr)); | |||||
strlcpy(iwr.ifr_name, ifname, sizeof(iwr.ifr_name)); | |||||
iwr.u.essid.pointer = ssid; | |||||
iwr.u.essid.length = IF_SSIDLEN; | |||||
if (ioctl(s, SIOCGIWESSID, &iwr) == 0) | |||||
retval = iwr.u.essid.length; | |||||
else | |||||
retval = -1; | |||||
close(s); | |||||
return retval; | |||||
#else | |||||
/* Stop gcc warning about unused parameters */ | |||||
ifname = ssid; | |||||
return -1; | |||||
#endif | |||||
} |