git.meshlink.io Git - catta/blob - src/iface-windows.c

   1 /***
   2   This file is part of catta.
   3
   4   catta is free software; you can redistribute it and/or modify it
   5   under the terms of the GNU Lesser General Public License as
   6   published by the Free Software Foundation; either version 2.1 of the
   7   License, or (at your option) any later version.
   8
   9   catta is distributed in the hope that it will be useful, but WITHOUT
  10   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
  11   or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General
  12   Public License for more details.
  13
  14   You should have received a copy of the GNU Lesser General Public
  15   License along with catta; if not, write to the Free Software
  16   Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307
  17   USA.
  18 ***/
  19
  20 #include "iface-windows.h"
  21 #include "iface.h"
  22
  23 #include <stdlib.h> // wcstombs
  24 #include <catta/malloc.h>
  25 #include <catta/log.h>
  26 #include <iphlpapi.h>
  27 #include "hashmap.h"
  28 #include "util.h"   // catta_format_mac_address
  29
  30
  31 // integrate the information from an IP_ADAPTER_UNICAST_ADDRESS structure for
  32 // given CattaHwInterface into the CattaInterfaceMonitor
  33 static void ip_adapter_unicast_address(CattaInterfaceMonitor *m,
  34                                        CattaHwInterface *hw,
  35                                        IP_ADAPTER_UNICAST_ADDRESS *a)
  36 {
  37     CattaInterface *iface;
  38     CattaAddress addr;
  39     CattaInterfaceAddress *ifaddr;
  40     struct sockaddr *sa = a->Address.lpSockaddr;
  41
  42     // fill addr struct for address lookup
  43     switch(sa->sa_family) {
  44     case AF_INET:
  45         memcpy(addr.data.data, &((struct sockaddr_in *)sa)->sin_addr, sizeof(struct in_addr));
  46         break;
  47     case AF_INET6:
  48         memcpy(addr.data.data, &((struct sockaddr_in6 *)sa)->sin6_addr, sizeof(struct in6_addr));
  49         break;
  50     default:
  51         catta_log_debug("unexpected address family on interface %d: %u", hw->index, sa->sa_family);
  52         return;
  53     }
  54     addr.proto = catta_af_to_proto(sa->sa_family);
  55
  56     // get protocol-specific CattaInterface object
  57     if(!(iface = catta_interface_monitor_get_interface(m, hw->index, addr.proto))) {
  58         catta_log_error("CattaInterface (index %d, proto %d) not found", hw->index, addr.proto);
  59         return;
  60     }
  61
  62     // find or allocate a CattaInterfaceAddress struct for this address
  63     if(!(ifaddr = catta_interface_monitor_get_address(m, iface, &addr))) {
  64         if(!(ifaddr = catta_interface_address_new(m, iface, &addr, a->OnLinkPrefixLength))) {
  65             catta_log_error("out of memory in ip_adapter_unicast_address");
  66             return;
  67         }
  68     }
  69
  70     // set global scope flag
  71     if(addr.proto == CATTA_PROTO_INET6)
  72         ifaddr->global_scope = !(IN6_IS_ADDR_LINKLOCAL((struct in6_addr *)addr.data.data)
  73                                  || IN6_IS_ADDR_MULTICAST((struct in6_addr *)addr.data.data));
  74     else
  75         ifaddr->global_scope = 1;
  76
  77     // XXX debugging, remove
  78     {
  79         char s[CATTA_ADDRESS_STR_MAX];
  80         catta_log_debug(" address: %s\n"
  81                         "   global_scope: %d\n"
  82                         "   flags: 0x%.4x",
  83             catta_address_snprint(s, sizeof(s), &addr),
  84             ifaddr->global_scope,
  85             (unsigned int)a->Flags);
  86     }
  87 }
  88
  89 // integrate the information from an IP_ADAPTER_ADDRESSES structure
  90 // as returned by GetAdaptersAddresses into the CattaInterfaceMonitor
  91 static void ip_adapter(CattaInterfaceMonitor *m, IP_ADAPTER_ADDRESSES *p)
  92 {
  93     IP_ADAPTER_UNICAST_ADDRESS *a;
  94     CattaIfIndex idx;
  95     CattaHwInterface *hw;
  96     size_t n;
  97
  98     // we want an index specific to the hardware interface, but Windows
  99     // has one for IPv4 and one for IPv6. it seems like these are always the
 100     // same unless one of the protocols is not available. let's have a bunch of
 101     // checks...
 102     if(!p->IfIndex && !p->Ipv6IfIndex) {
 103         return; // no usable protocols
 104     } else if(!p->IfIndex) {
 105         idx = p->Ipv6IfIndex;   // IPv6 but no IPv4 (huh!)
 106     } else if(!p->Ipv6IfIndex) {
 107         idx = p->IfIndex;       // IPv4 but no IPv6
 108     } else if(p->IfIndex == p->Ipv6IfIndex) {
 109         idx = p->IfIndex;       // same index for both protocols
 110     } else {
 111         // both indexes valid but not equal
 112         catta_log_error("unsupported interface: %ls (IfIndex and Ipv6IfIndex differ: %u/%u)",
 113             p->FriendlyName, (unsigned int)p->IfIndex, (unsigned int)p->Ipv6IfIndex);
 114         return;
 115     }
 116
 117     // find the CattaHwInterface by index or allocate a new one
 118     if((hw = catta_interface_monitor_get_hw_interface(m, idx)) == NULL) {
 119         if((hw = catta_hw_interface_new(m, idx)) == NULL) {
 120             catta_log_error("catta_hw_interface_new failed in ip_adapter_address");
 121             return;
 122         }
 123     }
 124
 125     // fill the CattaHwInterface struct with data
 126     hw->flags_ok =
 127         (p->OperStatus == IfOperStatusUp) &&
 128         !(p->IfType == IF_TYPE_SOFTWARE_LOOPBACK) &&
 129         !(p->Flags & IP_ADAPTER_NO_MULTICAST) &&
 130         (m->server->config.allow_point_to_point || !(p->IfType == IF_TYPE_PPP));
 131             // XXX what about IF_TYPE_TUNNEL?
 132
 133     n = wcstombs(NULL, p->FriendlyName, 0) + 1;
 134     catta_free(hw->name);
 135     hw->name = catta_new(char, n);
 136     wcstombs(hw->name, p->FriendlyName, n);
 137
 138     hw->mtu = p->Mtu;
 139
 140     hw->mac_address_size = p->PhysicalAddressLength;
 141     if(hw->mac_address_size > CATTA_MAC_ADDRESS_MAX)
 142         hw->mac_address_size = CATTA_MAC_ADDRESS_MAX;
 143     memcpy(hw->mac_address, p->PhysicalAddress, hw->mac_address_size);
 144
 145     // XXX debugging, remove
 146     {
 147         char mac[256];
 148         catta_log_debug(" name: %s\n"
 149                         " index: %d\n"
 150                         "   IfIndex: %u\n"
 151                         "   Ipv6IfIndex: %u\n"
 152                         " mtu: %d\n"
 153                         " mac: %s\n"
 154                         " flags_ok: %d\n"
 155                         "   type: %u\n"
 156                         "   status: %u\n"
 157                         "   multicast: %d\n"
 158                         "   flags: 0x%.4x",
 159             hw->name, hw->index,
 160             (unsigned int)p->IfIndex, (unsigned int)p->Ipv6IfIndex,
 161             hw->mtu,
 162             catta_format_mac_address(mac, sizeof(mac), hw->mac_address, hw->mac_address_size),
 163             hw->flags_ok,
 164             (unsigned int)p->IfType,
 165             (unsigned int)p->OperStatus,
 166             !(p->Flags & IP_ADAPTER_NO_MULTICAST),
 167             (unsigned int)p->Flags);
 168     }
 169
 170     // process addresses
 171     // XXX remove addresses that are no longer in the list
 172     for(a=p->FirstUnicastAddress; a; a=a->Next)
 173         ip_adapter_unicast_address(m, hw, a);
 174     catta_log_debug("=====");
 175 }
 176
 177
 178 int catta_interface_monitor_init_osdep(CattaInterfaceMonitor *m)
 179 {
 180     (void)*m;   // silence "unused paramter" warning
 181
 182     // XXX register callbacks to get notified of interface/address changes
 183
 184     return 0;
 185 }
 186
 187 void catta_interface_monitor_free_osdep(CattaInterfaceMonitor *m)
 188 {
 189     (void)*m;   // silence "unused paramter" warning
 190 }
 191
 192 void catta_interface_monitor_sync(CattaInterfaceMonitor *m)
 193 {
 194     IP_ADAPTER_ADDRESSES *buf = NULL;
 195     IP_ADAPTER_ADDRESSES *p;
 196     ULONG bufsize = 15000;
 197     ULONG r;
 198
 199     // allocate a buffer and call GetAdaptersAddresses
 200     // retry with the correct size if the buffer was too small
 201     do {
 202         catta_free(buf);    // no-op on first iteration
 203         if((buf = catta_malloc(bufsize)) == NULL) {
 204             catta_log_error("malloc failed in catta_interface_monitor_sync");
 205             return;
 206         }
 207
 208         r = GetAdaptersAddresses(AF_UNSPEC, 0, NULL, buf, &bufsize);
 209     } while(r == ERROR_BUFFER_OVERFLOW);
 210
 211     if(r != NO_ERROR) {
 212         catta_log_error("GetAdaptersAddresses failed: %u", (unsigned int)r);
 213         return;
 214     }
 215
 216     // XXX remove interfaces for adapters that are no longer in the list
 217
 218     // create 'CattaInterface's for every adapter
 219     for(p=buf; p; p=p->Next)
 220         ip_adapter(m, p);
 221
 222     catta_free(buf);
 223
 224     m->list_complete = 1;
 225     catta_interface_monitor_check_relevant(m);
 226     catta_interface_monitor_update_rrs(m, 0);
 227     catta_log_info("Network interface enumeration completed.");
 228 }