Samuel Tan | 71df777 | 2015-08-20 11:04:41 -0700 | [diff] [blame] | 1 | /* external/dhcpcd-6.8.2/ifaddrs.c |
| 2 | ** Copied from external/dhcpcd/ifaddrs.c. |
| 3 | ** |
| 4 | ** Copyright 2011, The Android Open Source Project |
| 5 | ** |
| 6 | ** Licensed under the Apache License, Version 2.0 (the "License");. |
| 7 | ** you may not use this file except in compliance with the License.. |
| 8 | ** You may obtain a copy of the License at. |
| 9 | ** |
| 10 | ** http://www.apache.org/licenses/LICENSE-2.0. |
| 11 | ** |
| 12 | ** Unless required by applicable law or agreed to in writing, software. |
| 13 | ** distributed under the License is distributed on an "AS IS" BASIS,. |
| 14 | ** WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.. |
| 15 | ** See the License for the specific language governing permissions and. |
| 16 | ** limitations under the License. |
| 17 | */ |
| 18 | |
| 19 | #include <arpa/inet.h> |
| 20 | #include <sys/socket.h> |
| 21 | #include "ifaddrs.h" |
| 22 | #include <stdio.h> |
| 23 | #include <stdlib.h> |
| 24 | #include <string.h> |
| 25 | #include <unistd.h> |
| 26 | #include <sys/types.h> |
| 27 | #include <dirent.h> |
| 28 | #include <netinet/ether.h> |
| 29 | #include <netdb.h> |
| 30 | #include <linux/if_packet.h> |
| 31 | #include <netinet/if_ether.h> |
| 32 | #include <linux/if_arp.h> |
| 33 | #include <netutils/ifc.h> |
| 34 | |
| 35 | struct ifaddrs *get_interface(const char *name, sa_family_t family) |
| 36 | { |
| 37 | unsigned addr, flags; |
| 38 | int masklen; |
| 39 | struct ifaddrs *ifa; |
| 40 | struct sockaddr_in *saddr = NULL; |
| 41 | struct sockaddr_in *smask = NULL; |
| 42 | struct sockaddr_ll *hwaddr = NULL; |
| 43 | unsigned char hwbuf[ETH_ALEN]; |
| 44 | |
| 45 | if (ifc_get_info(name, &addr, &masklen, &flags)) |
| 46 | return NULL; |
| 47 | |
| 48 | if ((family == AF_INET) && (addr == 0)) |
| 49 | return NULL; |
| 50 | |
| 51 | ifa = malloc(sizeof(struct ifaddrs)); |
| 52 | if (!ifa) |
| 53 | return NULL; |
| 54 | memset(ifa, 0, sizeof(struct ifaddrs)); |
| 55 | |
| 56 | ifa->ifa_name = malloc(strlen(name)+1); |
| 57 | if (!ifa->ifa_name) { |
| 58 | free(ifa); |
| 59 | return NULL; |
| 60 | } |
| 61 | strcpy(ifa->ifa_name, name); |
| 62 | ifa->ifa_flags = flags; |
| 63 | |
| 64 | if (family == AF_INET) { |
| 65 | saddr = malloc(sizeof(struct sockaddr_in)); |
| 66 | if (saddr) { |
| 67 | saddr->sin_addr.s_addr = addr; |
| 68 | saddr->sin_family = family; |
| 69 | } |
| 70 | ifa->ifa_addr = (struct sockaddr *)saddr; |
| 71 | |
| 72 | if (masklen != 0) { |
| 73 | smask = malloc(sizeof(struct sockaddr_in)); |
| 74 | if (smask) { |
| 75 | smask->sin_addr.s_addr = prefixLengthToIpv4Netmask(masklen); |
| 76 | smask->sin_family = family; |
| 77 | } |
| 78 | } |
| 79 | ifa->ifa_netmask = (struct sockaddr *)smask; |
| 80 | } else if (family == AF_PACKET) { |
| 81 | if (!ifc_get_hwaddr(name, hwbuf)) { |
| 82 | hwaddr = malloc(sizeof(struct sockaddr_ll)); |
| 83 | if (hwaddr) { |
| 84 | memset(hwaddr, 0, sizeof(struct sockaddr_ll)); |
| 85 | hwaddr->sll_family = family; |
| 86 | /* hwaddr->sll_protocol = ETHERTYPE_IP; */ |
Samuel Tan | c9637df | 2015-08-26 14:53:50 -0700 | [diff] [blame] | 87 | ifc_get_ifindex(ifa->ifa_name, &hwaddr->sll_ifindex); |
Samuel Tan | 71df777 | 2015-08-20 11:04:41 -0700 | [diff] [blame] | 88 | hwaddr->sll_hatype = ARPHRD_ETHER; |
| 89 | hwaddr->sll_halen = ETH_ALEN; |
| 90 | memcpy(hwaddr->sll_addr, hwbuf, ETH_ALEN); |
| 91 | } |
| 92 | } |
| 93 | ifa->ifa_addr = (struct sockaddr *)hwaddr; |
| 94 | ifa->ifa_netmask = (struct sockaddr *)smask; |
| 95 | } |
| 96 | return ifa; |
| 97 | } |
| 98 | |
| 99 | int getifaddrs(struct ifaddrs **ifap) |
| 100 | { |
| 101 | DIR *d; |
| 102 | struct dirent *de; |
| 103 | struct ifaddrs *ifa; |
| 104 | struct ifaddrs *ifah = NULL; |
| 105 | |
| 106 | if (!ifap) |
| 107 | return -1; |
| 108 | *ifap = NULL; |
| 109 | |
| 110 | if (ifc_init()) |
| 111 | return -1; |
| 112 | |
| 113 | d = opendir("/sys/class/net"); |
| 114 | if (d == 0) |
| 115 | return -1; |
| 116 | while ((de = readdir(d))) { |
| 117 | if (de->d_name[0] == '.') |
| 118 | continue; |
| 119 | ifa = get_interface(de->d_name, AF_INET); |
| 120 | if (ifa != NULL) { |
| 121 | ifa->ifa_next = ifah; |
| 122 | ifah = ifa; |
| 123 | } |
| 124 | ifa = get_interface(de->d_name, AF_PACKET); |
| 125 | if (ifa != NULL) { |
| 126 | ifa->ifa_next = ifah; |
| 127 | ifah = ifa; |
| 128 | } |
| 129 | } |
| 130 | *ifap = ifah; |
| 131 | closedir(d); |
| 132 | ifc_close(); |
| 133 | return 0; |
| 134 | } |
| 135 | |
| 136 | void freeifaddrs(struct ifaddrs *ifa) |
| 137 | { |
| 138 | struct ifaddrs *ifp; |
| 139 | |
| 140 | while (ifa) { |
| 141 | ifp = ifa; |
| 142 | free(ifp->ifa_name); |
| 143 | if (ifp->ifa_addr) |
| 144 | free(ifp->ifa_addr); |
| 145 | if (ifp->ifa_netmask) |
| 146 | free(ifp->ifa_netmask); |
| 147 | ifa = ifa->ifa_next; |
| 148 | free(ifp); |
| 149 | } |
| 150 | } |