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92 lines
2.9 KiB
C
92 lines
2.9 KiB
C
/*
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* dhcpcd - DHCP client daemon
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* Copyright (c) 2009-2013 Roy Marples <roy@marples.name>
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* All rights reserved
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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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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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/*
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* THIS IS A NASTY HACK THAT SHOULD NEVER HAVE HAPPENED
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* Basically we cannot include linux/if.h and net/if.h because
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* they have conflicting structures.
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* Sadly, linux/wireless.h includes linux/if.h all the time.
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* Some kernel-header installs fix this and some do not.
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* This file solely exists for those who do not.
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*
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* We *could* include wireless.h as that is designed for userspace,
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* but that then depends on the correct version of wireless-tools being
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* installed which isn't always the case.
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*/
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#include <sys/ioctl.h>
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#include <sys/socket.h>
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#include <linux/types.h>
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#include <linux/rtnetlink.h>
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/* Support older kernels */
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#ifdef IFLA_WIRELESS
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# include <linux/if.h>
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# include <linux/wireless.h>
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#else
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# define IFLA_WIRELESS (IFLA_MASTER + 1)
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#endif
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#include <string.h>
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#include <unistd.h>
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#include "common.h"
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#include "config.h"
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/* We can't include net.h or dhcpcd.h because
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* they would pull in net/if.h, which defeats the purpose of this hack. */
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#define IF_SSIDSIZE 33
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int getifssid(const char *ifname, char *ssid);
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int
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getifssid(const char *ifname, char *ssid)
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{
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#ifdef SIOCGIWESSID
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int s, retval;
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struct iwreq iwr;
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if ((s = socket(AF_INET, SOCK_DGRAM, 0)) == -1)
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return -1;
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memset(&iwr, 0, sizeof(iwr));
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strlcpy(iwr.ifr_name, ifname, sizeof(iwr.ifr_name));
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iwr.u.essid.pointer = ssid;
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iwr.u.essid.length = IF_SSIDSIZE - 1;
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if (ioctl(s, SIOCGIWESSID, &iwr) == 0) {
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retval = iwr.u.essid.length;
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ssid[retval] = '\0';
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} else
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retval = -1;
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close(s);
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return retval;
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#else
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/* Stop gcc warning about unused paramters */
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ifname = ssid;
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return -1;
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#endif
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}
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