scheduler/network.c

   1 /*
   2  * "$Id$"
   3  *
   4  *   Network interface functions for the CUPS scheduler.
   5  *
   6  *   Copyright 2007-2012 by Apple Inc.
   7  *   Copyright 1997-2006 by Easy Software Products, all rights reserved.
   8  *
   9  *   These coded instructions, statements, and computer programs are the
  10  *   property of Apple Inc. and are protected by Federal copyright
  11  *   law.  Distribution and use rights are outlined in the file "LICENSE.txt"
  12  *   "LICENSE" which should have been included with this file.  If this
  13  *   file is missing or damaged, see the license at "http://www.cups.org/".
  14  *
  15  * Contents:
  16  *
  17  *   cupsdNetIFFind()   - Find a network interface.
  18  *   cupsdNetIFFree()   - Free the current network interface list.
  19  *   cupsdNetIFUpdate() - Update the network interface list as needed...
  20  *   compare_netif()    - Compare two network interfaces.
  21  */
  22
  23 /*
  24  * Include necessary headers.
  25  */
  26
  27 #include <cups/http-private.h>
  28 #include "cupsd.h"
  29
  30
  31 /*
  32  * Local functions...
  33  */
  34
  35 static void     cupsdNetIFFree(void);
  36 static int      compare_netif(cupsd_netif_t *a, cupsd_netif_t *b);
  37
  38
  39 /*
  40  * 'cupsdNetIFFind()' - Find a network interface.
  41  */
  42
  43 cupsd_netif_t *                         /* O - Network interface data */
  44 cupsdNetIFFind(const char *name)        /* I - Name of interface */
  45 {
  46   cupsd_netif_t key;                    /* Search key */
  47
  48
  49  /*
  50   * Update the interface list as needed...
  51   */
  52
  53   if (NetIFUpdate)
  54     cupsdNetIFUpdate();
  55
  56  /*
  57   * Search for the named interface...
  58   */
  59
  60   strlcpy(key.name, name, sizeof(key.name));
  61
  62   return ((cupsd_netif_t *)cupsArrayFind(NetIFList, &key));
  63 }
  64
  65
  66 /*
  67  * 'cupsdNetIFFree()' - Free the current network interface list.
  68  */
  69
  70 static void
  71 cupsdNetIFFree(void)
  72 {
  73   cupsd_netif_t *current;               /* Current interface in array */
  74
  75
  76  /*
  77   * Loop through the interface list and free all the records...
  78   */
  79
  80   for (current = (cupsd_netif_t *)cupsArrayFirst(NetIFList);
  81        current;
  82        current = (cupsd_netif_t *)cupsArrayNext(NetIFList))
  83   {
  84     cupsArrayRemove(NetIFList, current);
  85     free(current);
  86   }
  87 }
  88
  89
  90 /*
  91  * 'cupsdNetIFUpdate()' - Update the network interface list as needed...
  92  */
  93
  94 void
  95 cupsdNetIFUpdate(void)
  96 {
  97   int                   match;          /* Matching address? */
  98   cupsd_listener_t      *lis;           /* Listen address */
  99   cupsd_netif_t         *temp;          /* New interface */
 100   struct ifaddrs        *addrs,         /* Interface address list */
 101                         *addr;          /* Current interface address */
 102   char                  hostname[1024]; /* Hostname for address */
 103   size_t                hostlen;        /* Length of hostname */
 104
 105
 106  /*
 107   * Only update the list if we need to...
 108   */
 109
 110   if (!NetIFUpdate)
 111     return;
 112
 113   NetIFUpdate = 0;
 114
 115  /*
 116   * Free the old interfaces...
 117   */
 118
 119   cupsdNetIFFree();
 120
 121  /*
 122   * Make sure we have an array...
 123   */
 124
 125   if (!NetIFList)
 126     NetIFList = cupsArrayNew((cups_array_func_t)compare_netif, NULL);
 127
 128   if (!NetIFList)
 129     return;
 130
 131  /*
 132   * Grab a new list of interfaces...
 133   */
 134
 135   if (getifaddrs(&addrs) < 0)
 136     return;
 137
 138   for (addr = addrs; addr != NULL; addr = addr->ifa_next)
 139   {
 140    /*
 141     * See if this interface address is IPv4 or IPv6...
 142     */
 143
 144     if (addr->ifa_addr == NULL ||
 145         (addr->ifa_addr->sa_family != AF_INET
 146 #ifdef AF_INET6
 147          && addr->ifa_addr->sa_family != AF_INET6
 148 #endif
 149         ) ||
 150         addr->ifa_netmask == NULL || addr->ifa_name == NULL)
 151       continue;
 152
 153    /*
 154     * Try looking up the hostname for the address as needed...
 155     */
 156
 157     if (HostNameLookups)
 158       httpAddrLookup((http_addr_t *)(addr->ifa_addr), hostname,
 159                      sizeof(hostname));
 160     else
 161     {
 162      /*
 163       * Map the default server address and localhost to the server name
 164       * and localhost, respectively; for all other addresses, use the
 165       * numeric address...
 166       */
 167
 168       if (httpAddrLocalhost((http_addr_t *)(addr->ifa_addr)))
 169         strlcpy(hostname, "localhost", sizeof(hostname));
 170       else
 171         httpAddrString((http_addr_t *)(addr->ifa_addr), hostname,
 172                        sizeof(hostname));
 173     }
 174
 175    /*
 176     * Create a new address element...
 177     */
 178
 179     hostlen = strlen(hostname);
 180     if ((temp = calloc(1, sizeof(cupsd_netif_t) + hostlen)) == NULL)
 181       break;
 182
 183    /*
 184     * Copy all of the information...
 185     */
 186
 187     strlcpy(temp->name, addr->ifa_name, sizeof(temp->name));
 188     temp->hostlen = hostlen;
 189     memcpy(temp->hostname, hostname, hostlen + 1);
 190
 191     if (addr->ifa_addr->sa_family == AF_INET)
 192     {
 193      /*
 194       * Copy IPv4 addresses...
 195       */
 196
 197       memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in));
 198       memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in));
 199
 200       if (addr->ifa_dstaddr)
 201         memcpy(&(temp->broadcast), addr->ifa_dstaddr,
 202                sizeof(struct sockaddr_in));
 203     }
 204 #ifdef AF_INET6
 205     else
 206     {
 207      /*
 208       * Copy IPv6 addresses...
 209       */
 210
 211       memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in6));
 212       memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in6));
 213
 214       if (addr->ifa_dstaddr)
 215         memcpy(&(temp->broadcast), addr->ifa_dstaddr,
 216                sizeof(struct sockaddr_in6));
 217     }
 218 #endif /* AF_INET6 */
 219
 220     if (!(addr->ifa_flags & IFF_POINTOPOINT) &&
 221         !httpAddrLocalhost(&(temp->address)))
 222       temp->is_local = 1;
 223
 224    /*
 225     * Determine which port to use when advertising printers...
 226     */
 227
 228     for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 229          lis;
 230          lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 231     {
 232       match = 0;
 233
 234       if (httpAddrAny(&(lis->address)))
 235         match = 1;
 236       else if (addr->ifa_addr->sa_family == AF_INET &&
 237                lis->address.addr.sa_family == AF_INET &&
 238                (lis->address.ipv4.sin_addr.s_addr &
 239                 temp->mask.ipv4.sin_addr.s_addr) ==
 240                    (temp->address.ipv4.sin_addr.s_addr &
 241                     temp->mask.ipv4.sin_addr.s_addr))
 242         match = 1;
 243 #ifdef AF_INET6
 244       else if (addr->ifa_addr->sa_family == AF_INET6 &&
 245                lis->address.addr.sa_family == AF_INET6 &&
 246                (lis->address.ipv6.sin6_addr.s6_addr[0] &
 247                 temp->mask.ipv6.sin6_addr.s6_addr[0]) ==
 248                    (temp->address.ipv6.sin6_addr.s6_addr[0] &
 249                     temp->mask.ipv6.sin6_addr.s6_addr[0]) &&
 250                (lis->address.ipv6.sin6_addr.s6_addr[1] &
 251                 temp->mask.ipv6.sin6_addr.s6_addr[1]) ==
 252                    (temp->address.ipv6.sin6_addr.s6_addr[1] &
 253                     temp->mask.ipv6.sin6_addr.s6_addr[1]) &&
 254                (lis->address.ipv6.sin6_addr.s6_addr[2] &
 255                 temp->mask.ipv6.sin6_addr.s6_addr[2]) ==
 256                    (temp->address.ipv6.sin6_addr.s6_addr[2] &
 257                     temp->mask.ipv6.sin6_addr.s6_addr[2]) &&
 258                (lis->address.ipv6.sin6_addr.s6_addr[3] &
 259                 temp->mask.ipv6.sin6_addr.s6_addr[3]) ==
 260                    (temp->address.ipv6.sin6_addr.s6_addr[3] &
 261                     temp->mask.ipv6.sin6_addr.s6_addr[3]))
 262         match = 1;
 263 #endif /* AF_INET6 */
 264
 265       if (match)
 266       {
 267         temp->port = httpAddrPort(&(lis->address));
 268         break;
 269       }
 270     }
 271
 272    /*
 273     * Add it to the array...
 274     */
 275
 276     cupsArrayAdd(NetIFList, temp);
 277
 278     cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdNetIFUpdate: \"%s\" = %s:%d",
 279                     temp->name, temp->hostname, temp->port);
 280   }
 281
 282   freeifaddrs(addrs);
 283 }
 284
 285
 286 /*
 287  * 'compare_netif()' - Compare two network interfaces.
 288  */
 289
 290 static int                              /* O - Result of comparison */
 291 compare_netif(cupsd_netif_t *a,         /* I - First network interface */
 292               cupsd_netif_t *b)         /* I - Second network interface */
 293 {
 294   return (strcmp(a->name, b->name));
 295 }
 296
 297
 298 /*
 299  * End of "$Id$".
 300  */