Samuel Tan | d7ed851 | 2015-08-13 16:11:35 -0700 | [diff] [blame] | 1 | /* |
| 2 | * dhcpcd - DHCP client daemon |
| 3 | * Copyright (c) 2009-2015 Roy Marples <roy@marples.name> |
| 4 | * All rights reserved |
| 5 | |
| 6 | * Redistribution and use in source and binary forms, with or without |
| 7 | * modification, are permitted provided that the following conditions |
| 8 | * are met: |
| 9 | * 1. Redistributions of source code must retain the above copyright |
| 10 | * notice, this list of conditions and the following disclaimer. |
| 11 | * 2. Redistributions in binary form must reproduce the above copyright |
| 12 | * notice, this list of conditions and the following disclaimer in the |
| 13 | * documentation and/or other materials provided with the distribution. |
| 14 | * |
| 15 | * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND |
| 16 | * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE |
| 17 | * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE |
| 18 | * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE |
| 19 | * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL |
| 20 | * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS |
| 21 | * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) |
| 22 | * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT |
| 23 | * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY |
| 24 | * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
| 25 | * SUCH DAMAGE. |
| 26 | */ |
| 27 | |
| 28 | /* |
| 29 | * THIS IS A NASTY HACK THAT SHOULD NEVER HAVE HAPPENED |
| 30 | * Basically we cannot include linux/if.h and net/if.h because |
| 31 | * they have conflicting structures. |
| 32 | * Sadly, linux/wireless.h includes linux/if.h all the time. |
| 33 | * Some kernel-header installs fix this and some do not. |
| 34 | * This file solely exists for those who do not. |
| 35 | * |
| 36 | * We *could* include wireless.h as that is designed for userspace, |
| 37 | * but that then depends on the correct version of wireless-tools being |
| 38 | * installed which isn't always the case. |
| 39 | */ |
| 40 | |
| 41 | #include <sys/ioctl.h> |
| 42 | #include <sys/socket.h> |
| 43 | |
| 44 | #include <linux/types.h> |
| 45 | #include <linux/rtnetlink.h> |
| 46 | /* Support older kernels */ |
| 47 | #ifdef IFLA_WIRELESS |
| 48 | # include <linux/if.h> |
| 49 | # include <linux/wireless.h> |
| 50 | #else |
| 51 | # define IFLA_WIRELESS (IFLA_MASTER + 1) |
| 52 | #endif |
| 53 | |
| 54 | #include <string.h> |
| 55 | #include <unistd.h> |
| 56 | |
| 57 | #include "config.h" |
| 58 | |
| 59 | /* We can't include if.h or dhcpcd.h because |
| 60 | * they would pull in net/if.h, which defeats the purpose of this hack. */ |
| 61 | #define IF_SSIDSIZE 33 |
| 62 | int if_getssid_wext(const char *ifname, uint8_t *ssid); |
| 63 | |
| 64 | int |
| 65 | if_getssid_wext(const char *ifname, uint8_t *ssid) |
| 66 | { |
| 67 | #ifdef SIOCGIWESSID |
| 68 | int s, retval; |
| 69 | struct iwreq iwr; |
| 70 | |
| 71 | if ((s = socket(PF_INET, SOCK_DGRAM, 0)) == -1) |
| 72 | return -1; |
| 73 | memset(&iwr, 0, sizeof(iwr)); |
| 74 | strlcpy(iwr.ifr_name, ifname, sizeof(iwr.ifr_name)); |
| 75 | iwr.u.essid.pointer = ssid; |
| 76 | iwr.u.essid.length = IF_SSIDSIZE - 1; |
| 77 | |
| 78 | if (ioctl(s, SIOCGIWESSID, &iwr) == 0) { |
| 79 | retval = iwr.u.essid.length; |
| 80 | ssid[retval] = '\0'; |
| 81 | } else |
| 82 | retval = -1; |
| 83 | close(s); |
| 84 | return retval; |
| 85 | #else |
| 86 | /* Stop gcc warning about unused parameters */ |
| 87 | ifname = ssid; |
| 88 | return -1; |
| 89 | #endif |
| 90 | } |