1 /*** 2 This file is part of avahi. 3 4 avahi 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 avahi 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 avahi; if not, write to the Free Software 16 Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 17 USA. 18 ***/ 19 20 #ifdef HAVE_CONFIG_H 21 #include <config.h> 22 #endif 23 24 #include <sys/types.h> 25 #include <netinet/in.h> 26 #include <sys/socket.h> 27 #include <arpa/inet.h> 28 #include <string.h> 29 #include <assert.h> 30 31 #include "addr-util.h" 32 33 AvahiAddress *avahi_address_from_sockaddr(const struct sockaddr* sa, AvahiAddress *ret_addr) { 34 assert(sa); 35 assert(ret_addr); 36 37 assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6); 38 39 ret_addr->proto = avahi_af_to_proto(sa->sa_family); 40 41 if (sa->sa_family == AF_INET) 42 memcpy(&ret_addr->data.ipv4, &((const struct sockaddr_in*) sa)->sin_addr, sizeof(ret_addr->data.ipv4)); 43 else 44 memcpy(&ret_addr->data.ipv6, &((const struct sockaddr_in6*) sa)->sin6_addr, sizeof(ret_addr->data.ipv6)); 45 46 return ret_addr; 47 } 48 49 uint16_t avahi_port_from_sockaddr(const struct sockaddr* sa) { 50 assert(sa); 51 52 assert(sa->sa_family == AF_INET || sa->sa_family == AF_INET6); 53 54 if (sa->sa_family == AF_INET) 55 return ntohs(((const struct sockaddr_in*) sa)->sin_port); 56 else 57 return ntohs(((const struct sockaddr_in6*) sa)->sin6_port); 58 } 59 60 int avahi_address_is_ipv4_in_ipv6(const AvahiAddress *a) { 61 62 static const uint8_t ipv4_in_ipv6[] = { 63 0x00, 0x00, 0x00, 0x00, 64 0x00, 0x00, 0x00, 0x00, 65 0xFF, 0xFF, 0xFF, 0xFF 66 }; 67 68 assert(a); 69 70 if (a->proto != AVAHI_PROTO_INET6) 71 return 0; 72 73 return memcmp(a->data.ipv6.address, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0; 74 } 75 76 #define IPV4LL_NETWORK 0xA9FE0000L 77 #define IPV4LL_NETMASK 0xFFFF0000L 78 #define IPV6LL_NETWORK 0xFE80 79 #define IPV6LL_NETMASK 0xFFC0 80 81 int avahi_address_is_link_local(const AvahiAddress *a) { 82 assert(a); 83 84 if (a->proto == AVAHI_PROTO_INET) { 85 uint32_t n = ntohl(a->data.ipv4.address); 86 return (n & IPV4LL_NETMASK) == IPV4LL_NETWORK; 87 } 88 else if (a->proto == AVAHI_PROTO_INET6) { 89 unsigned n = (a->data.ipv6.address[0] << 8) | (a->data.ipv6.address[1] << 0); 90 return (n & IPV6LL_NETMASK) == IPV6LL_NETWORK; 91 } 92 93 return 0; 94 } 95
