src/uuid.c

   1 /**
   2  * @file uuid.c
   3  *
   4  * This program is free software; you can redistribute it and/or modify
   5  * it under the terms of the GNU General Public License as published by
   6  * the Free Software Foundation; either version 2 of the License, or
   7  * (at your option) any later version.
   8  *
   9  * This program is distributed in the hope that it will be useful,
  10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  12  * GNU General Public License for more details.
  13  *
  14  * You should have received a copy of the GNU General Public License
  15  * along with this program; if not, write to the Free Software
  16  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  17  */
  18 #include <stdio.h>
  19 #include <stdlib.h>
  20 #include <string.h>
  21
  22 #include <fcntl.h>
  23 #include <unistd.h>
  24
  25 #include <sys/ioctl.h>
  26 #include <sys/types.h>
  27 #include <sys/socket.h>
  28 #include <netinet/in.h>
  29 #include <linux/if.h>
  30
  31 #include <purple.h>
  32 #include <glib.h>
  33 #include "uuid.h"
  34
  35 static const char *epid_ns_uuid = "fcacfb03-8a73-46ef-91b1-e5ebeeaba4fe";
  36
  37 #define UUID_OFFSET_TO_LAST_SEGMENT 24
  38
  39 void readUUID(const char *string, sipe_uuid_t *uuid)
  40 {
  41         int i;
  42         sscanf(string, "%08x-%04hx-%04hx-%02hhx%02hhx-", &uuid->time_low
  43                         , &uuid->time_mid, &uuid->time_hi_and_version
  44                         , &uuid->clock_seq_hi_and_reserved
  45                         , &uuid->clock_seq_low );
  46
  47         for(i=0;i<6;i++)
  48         {
  49                 sscanf(&string[UUID_OFFSET_TO_LAST_SEGMENT+i*2], "%02hhx", &uuid->node[i]);
  50         }
  51 }
  52
  53 void printUUID(sipe_uuid_t *uuid, char *string)
  54 {
  55         int i;
  56         size_t pos;
  57         sprintf(string, "%08x-%04x-%04x-%02x%02x-", uuid->time_low
  58                         , uuid->time_mid, uuid->time_hi_and_version
  59                         , uuid->clock_seq_hi_and_reserved
  60                         , uuid->clock_seq_low
  61                         );
  62         pos = strlen(string);
  63         for(i=0;i<6;i++)
  64         {
  65                 pos += sprintf(&string[pos], "%02x", uuid->node[i]);
  66         }
  67 }
  68
  69 void createUUIDfromHash(sipe_uuid_t *uuid, const unsigned char *hash)
  70 {
  71         memcpy(uuid, hash, sizeof(sipe_uuid_t));
  72         uuid->time_hi_and_version &= 0x0FFF;
  73         uuid->time_hi_and_version |= 0x5000;
  74         uuid->clock_seq_hi_and_reserved &= 0x3F;
  75         uuid->clock_seq_hi_and_reserved |= 0x80;
  76 }
  77
  78 char *generateUUIDfromEPID(const gchar *epid)
  79 {
  80         sipe_uuid_t result;
  81         PurpleCipherContext *ctx;
  82         unsigned char hash[20];
  83         char buf[512];
  84
  85         readUUID(epid_ns_uuid, &result);
  86         memcpy(buf, &result, sizeof(sipe_uuid_t));
  87         sprintf(&buf[sizeof(sipe_uuid_t)], epid);
  88
  89         ctx = purple_cipher_context_new_by_name("sha1", NULL);
  90         purple_cipher_context_append(ctx, buf, strlen(buf));
  91         purple_cipher_context_digest(ctx, sizeof(hash), hash, NULL);
  92         purple_cipher_context_destroy(ctx);
  93
  94         createUUIDfromHash(&result, hash);
  95         printUUID(&result, buf);
  96         return g_strdup(buf);
  97 }
  98
  99 long mac_addr_sys (const char *addr)
 100 {
 101 /* implementation for Linux */
 102     struct ifreq ifr;
 103     struct ifreq *IFR;
 104     struct ifconf ifc;
 105     char buf[1024];
 106     int s, i;
 107     int ok = 0;
 108
 109     s = socket(AF_INET, SOCK_DGRAM, 0);
 110     if (s==-1) {
 111         return -1;
 112     }
 113
 114     ifc.ifc_len = sizeof(buf);
 115     ifc.ifc_buf = buf;
 116     ioctl(s, SIOCGIFCONF, &ifc);
 117
 118     IFR = ifc.ifc_req;
 119     for (i = ifc.ifc_len / sizeof(struct ifreq); --i >= 0; IFR++) {
 120
 121         strcpy(ifr.ifr_name, IFR->ifr_name);
 122         if (ioctl(s, SIOCGIFFLAGS, &ifr) == 0) {
 123             if (! (ifr.ifr_flags & IFF_LOOPBACK)) {
 124                 if (ioctl(s, SIOCGIFHWADDR, &ifr) == 0) {
 125                     ok = 1;
 126                     break;
 127                 }
 128             }
 129         }
 130     }
 131
 132     close(s);
 133     if (ok) {
 134         memmove( addr, ifr.ifr_hwaddr.sa_data, 6);
 135     }
 136     else {
 137         return -1;
 138     }
 139     return 0;
 140 }
 141
 142 gchar * sipe_uuid_get_macaddr()
 143 {
 144         guchar addr[6];
 145         long mac_add = mac_addr_sys(addr);
 146         gchar nmac[13];
 147
 148         if (mac_add == 0){
 149                 int i,j;
 150                 for (i = 0,j=0; i < 6; i++,j+=2) {
 151                         g_sprintf(&nmac[j], "%02X", addr[i]);
 152                 }
 153                 return g_strdup(nmac);
 154         }
 155         return g_strdup_printf("01010101");  //Default
 156 }