summaryrefslogtreecommitdiffstats
path: root/hicn-light/src/platforms/darwin/system.c
blob: b8ef80c63834127476f3c169fc6b9477422d4cf7 (plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
/*
 * Copyright (c) 2017-2019 Cisco and/or its affiliates.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at:
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

#include <errno.h>
#include <ifaddrs.h>
#include <src/config.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <sys/types.h>

#include <net/if.h>
#include <net/if_dl.h>
#include <net/if_types.h>
#include <sys/socket.h>

#include <parc/assert/parc_Assert.h>

#include <src/utils/interfaceSet.h>

#include <src/core/forwarder.h>
#include <src/core/system.h>

InterfaceSet *system_Interfaces(Forwarder *forwarder) {
  InterfaceSet *set = interfaceSetCreate();

  // this is the dynamically allocated head of the list
  struct ifaddrs *ifaddr;
  int failure = getifaddrs(&ifaddr);
  parcAssertFalse(failure, "Error getifaddrs: (%d) %s", errno, strerror(errno));

  struct ifaddrs *next;
  for (next = ifaddr; next != NULL; next = next->ifa_next) {
    if ((next->ifa_addr == NULL) || ((next->ifa_flags & IFF_UP) == 0)) {
      continue;
    }

    // This assumes the LINK address comes first so we can get the MTU
    // when the interface is created.

    Interface *iface = interfaceSetGetByName(set, next->ifa_name);
    if (iface == NULL) {
      unsigned mtu = 0;

      if (next->ifa_data != NULL) {
        struct if_data *ifdata = (struct if_data *)next->ifa_data;
        mtu = ifdata->ifi_mtu;
      }

      iface = interfaceCreate(
          next->ifa_name, forwarder_GetNextConnectionId(forwarder),
          next->ifa_flags & IFF_LOOPBACK, next->ifa_flags & IFF_MULTICAST, mtu);

      interfaceSetAdd(set, iface);
    }

    int family = next->ifa_addr->sa_family;
    switch (family) {
      case AF_INET: {
        Address *address =
            addressCreateFromInet((struct sockaddr_in *)next->ifa_addr);
        interfaceAddAddress(iface, address);
        break;
      }

      case AF_INET6: {
        Address *address =
            addressCreateFromInet6((struct sockaddr_in6 *)next->ifa_addr);
        interfaceAddAddress(iface, address);
        break;
      }

      case AF_LINK: {
        struct sockaddr_dl *addr_dl = (struct sockaddr_dl *)next->ifa_addr;

        // skip links with 0-length address
        if (addr_dl->sdl_alen > 0) {
          // addr_dl->sdl_data[12] contains the interface name followed by the
          // MAC address, so need to offset in to the array past the interface
          // name.
          Address *address = addressCreateFromLink(
              (uint8_t *)&addr_dl->sdl_data[addr_dl->sdl_nlen],
              addr_dl->sdl_alen);
          interfaceAddAddress(iface, address);
        }
        break;
      }
    }
  }

  freeifaddrs(ifaddr);

  return set;
}

Address *system_GetMacAddressByName(Forwarder *forwarder,
                                    const char *interfaceName) {
  Address *linkAddress = NULL;

  InterfaceSet *interfaceSet = system_Interfaces(forwarder);
  Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);

  if (interface) {
    const AddressList *addressList = interfaceGetAddresses(interface);

    size_t length = addressListLength(addressList);
    for (size_t i = 0; i < length && !linkAddress; i++) {
      const Address *a = addressListGetItem(addressList, i);
      if (addressGetType(a) == ADDR_LINK) {
        linkAddress = addressCopy(a);
      }
    }
  }

  interfaceSetDestroy(&interfaceSet);

  return linkAddress;
}

unsigned system_InterfaceMtu(Forwarder *forwarder, const char *interfaceName) {
  unsigned mtu = 0;

  if (interfaceName) {
    InterfaceSet *interfaceSet = system_Interfaces(forwarder);
    Interface *interface = interfaceSetGetByName(interfaceSet, interfaceName);

    if (interface) {
      mtu = interfaceGetMTU(interface);
    }

    interfaceSetDestroy(&interfaceSet);
  }
  return mtu;
}