scheduler/network.c

   1 /*
   2  * "$Id: network.c 7861 2008-08-26 03:15:14Z mike $"
   3  *
   4  *   Network interface functions for the CUPS scheduler.
   5  *
   6  *   Copyright 2007-2010 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 #ifdef __APPLE__
 158     if (HostNameLookups)
 159 #else
 160     if (HostNameLookups || RemotePort)
 161 #endif /* __APPLE__ */
 162       httpAddrLookup((http_addr_t *)(addr->ifa_addr), hostname,
 163                      sizeof(hostname));
 164     else
 165     {
 166      /*
 167       * Map the default server address and localhost to the server name
 168       * and localhost, respectively; for all other addresses, use the
 169       * dotted notation...
 170       */
 171
 172       if (httpAddrLocalhost((http_addr_t *)(addr->ifa_addr)))
 173         strcpy(hostname, "localhost");
 174       else
 175         httpAddrString((http_addr_t *)(addr->ifa_addr), hostname,
 176                        sizeof(hostname));
 177     }
 178
 179    /*
 180     * Create a new address element...
 181     */
 182
 183     hostlen = strlen(hostname);
 184     if ((temp = calloc(1, sizeof(cupsd_netif_t) + hostlen)) == NULL)
 185       break;
 186
 187    /*
 188     * Copy all of the information...
 189     */
 190
 191     strlcpy(temp->name, addr->ifa_name, sizeof(temp->name));
 192     temp->hostlen = hostlen;
 193     strcpy(temp->hostname, hostname);   /* Safe because hostname is allocated */
 194
 195     if (addr->ifa_addr->sa_family == AF_INET)
 196     {
 197      /*
 198       * Copy IPv4 addresses...
 199       */
 200
 201       memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in));
 202       memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in));
 203
 204       if (addr->ifa_dstaddr)
 205         memcpy(&(temp->broadcast), addr->ifa_dstaddr,
 206                sizeof(struct sockaddr_in));
 207     }
 208 #ifdef AF_INET6
 209     else
 210     {
 211      /*
 212       * Copy IPv6 addresses...
 213       */
 214
 215       memcpy(&(temp->address), addr->ifa_addr, sizeof(struct sockaddr_in6));
 216       memcpy(&(temp->mask), addr->ifa_netmask, sizeof(struct sockaddr_in6));
 217
 218       if (addr->ifa_dstaddr)
 219         memcpy(&(temp->broadcast), addr->ifa_dstaddr,
 220                sizeof(struct sockaddr_in6));
 221     }
 222 #endif /* AF_INET6 */
 223
 224     if (!(addr->ifa_flags & IFF_POINTOPOINT) &&
 225         !httpAddrLocalhost(&(temp->address)))
 226       temp->is_local = 1;
 227
 228    /*
 229     * Determine which port to use when advertising printers...
 230     */
 231
 232     for (lis = (cupsd_listener_t *)cupsArrayFirst(Listeners);
 233          lis;
 234          lis = (cupsd_listener_t *)cupsArrayNext(Listeners))
 235     {
 236       match = 0;
 237
 238       if (httpAddrAny(&(lis->address)))
 239         match = 1;
 240       else if (addr->ifa_addr->sa_family == AF_INET &&
 241                lis->address.addr.sa_family == AF_INET &&
 242                (lis->address.ipv4.sin_addr.s_addr &
 243                 temp->mask.ipv4.sin_addr.s_addr) ==
 244                    (temp->address.ipv4.sin_addr.s_addr &
 245                     temp->mask.ipv4.sin_addr.s_addr))
 246         match = 1;
 247 #ifdef AF_INET6
 248       else if (addr->ifa_addr->sa_family == AF_INET6 &&
 249                lis->address.addr.sa_family == AF_INET6 &&
 250                (lis->address.ipv6.sin6_addr.s6_addr[0] &
 251                 temp->mask.ipv6.sin6_addr.s6_addr[0]) ==
 252                    (temp->address.ipv6.sin6_addr.s6_addr[0] &
 253                     temp->mask.ipv6.sin6_addr.s6_addr[0]) &&
 254                (lis->address.ipv6.sin6_addr.s6_addr[1] &
 255                 temp->mask.ipv6.sin6_addr.s6_addr[1]) ==
 256                    (temp->address.ipv6.sin6_addr.s6_addr[1] &
 257                     temp->mask.ipv6.sin6_addr.s6_addr[1]) &&
 258                (lis->address.ipv6.sin6_addr.s6_addr[2] &
 259                 temp->mask.ipv6.sin6_addr.s6_addr[2]) ==
 260                    (temp->address.ipv6.sin6_addr.s6_addr[2] &
 261                     temp->mask.ipv6.sin6_addr.s6_addr[2]) &&
 262                (lis->address.ipv6.sin6_addr.s6_addr[3] &
 263                 temp->mask.ipv6.sin6_addr.s6_addr[3]) ==
 264                    (temp->address.ipv6.sin6_addr.s6_addr[3] &
 265                     temp->mask.ipv6.sin6_addr.s6_addr[3]))
 266         match = 1;
 267 #endif /* AF_INET6 */
 268
 269       if (match)
 270       {
 271         if (lis->address.addr.sa_family == AF_INET)
 272           temp->port = ntohs(lis->address.ipv4.sin_port);
 273 #ifdef AF_INET6
 274         else if (lis->address.addr.sa_family == AF_INET6)
 275           temp->port = ntohs(lis->address.ipv6.sin6_port);
 276 #endif /* AF_INET6 */
 277         break;
 278       }
 279     }
 280
 281    /*
 282     * Add it to the array...
 283     */
 284
 285     cupsArrayAdd(NetIFList, temp);
 286
 287     cupsdLogMessage(CUPSD_LOG_DEBUG, "cupsdNetIFUpdate: \"%s\" = %s:%d",
 288                     temp->name, temp->hostname, temp->port);
 289   }
 290
 291   freeifaddrs(addrs);
 292 }
 293
 294
 295 /*
 296  * 'compare_netif()' - Compare two network interfaces.
 297  */
 298
 299 static int                              /* O - Result of comparison */
 300 compare_netif(cupsd_netif_t *a,         /* I - First network interface */
 301               cupsd_netif_t *b)         /* I - Second network interface */
 302 {
 303   return (strcmp(a->name, b->name));
 304 }
 305
 306
 307 /*
 308  * End of "$Id: network.c 7861 2008-08-26 03:15:14Z mike $".
 309  */