diff options
Diffstat (limited to 'if-linux-wireless.c')
| -rw-r--r-- | if-linux-wireless.c | 89 |
1 files changed, 89 insertions, 0 deletions
diff --git a/if-linux-wireless.c b/if-linux-wireless.c new file mode 100644 index 0000000..dce1892 --- /dev/null +++ b/if-linux-wireless.c @@ -0,0 +1,89 @@ +/* + * dhcpcd - DHCP client daemon + * Copyright (c) 2009-2010 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/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 "common.h" + +/* We can't include net.h or dhcpcd.h because + * they would pull in net/if.h, which defeats the purpose of this hack. */ +#define IF_SSIDSIZE 33 +int getifssid(const char *ifname, char *ssid); + +int +getifssid(const char *ifname, char *ssid) +{ +#ifdef SIOCGIWESSID + int s, retval; + struct iwreq iwr; + + if ((s = socket(AF_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_SSIDSIZE - 1; + + if (ioctl(s, SIOCGIWESSID, &iwr) == 0) { + retval = iwr.u.essid.length; + ssid[retval] = '\0'; + } else + retval = -1; + close(s); + return retval; +#else + /* Stop gcc warning about unused paramters */ + ifname = ssid; + return -1; +#endif +} |