Tarun Kundu | 12e3b2e | 2024-08-15 16:16:53 -0700 | [diff] [blame] | 1 | /* dnsmasq is Copyright (c) 2000-2024 Simon Kelley |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 2 | |
| 3 | This program is free software; you can redistribute it and/or modify |
| 4 | it under the terms of the GNU General Public License as published by |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 5 | the Free Software Foundation; version 2 dated June, 1991, or |
| 6 | (at your option) version 3 dated 29 June, 2007. |
| 7 | |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 8 | This program is distributed in the hope that it will be useful, |
| 9 | but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 10 | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 11 | GNU General Public License for more details. |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 12 | |
Simon Kelley | 73a08a2 | 2009-02-05 20:28:08 +0000 | [diff] [blame] | 13 | You should have received a copy of the GNU General Public License |
| 14 | along with this program. If not, see <http://www.gnu.org/licenses/>. |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 15 | */ |
| 16 | |
| 17 | #include "dnsmasq.h" |
| 18 | |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 19 | #if defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK) |
Simon Kelley | 70969c1 | 2012-03-07 20:46:28 +0000 | [diff] [blame] | 20 | #include <ifaddrs.h> |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 21 | |
Simon Kelley | 132255b | 2012-08-06 20:12:04 +0100 | [diff] [blame] | 22 | #include <sys/param.h> |
Andy Stormont | 8de875f | 2016-02-01 12:07:57 +0000 | [diff] [blame] | 23 | #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 24 | #include <sys/sysctl.h> |
Andy Stormont | 8de875f | 2016-02-01 12:07:57 +0000 | [diff] [blame] | 25 | #endif |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 26 | #include <net/if.h> |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 27 | #include <net/route.h> |
| 28 | #include <net/if_dl.h> |
| 29 | #include <netinet/if_ether.h> |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 30 | #if defined(__FreeBSD__) |
| 31 | # include <net/if_var.h> |
| 32 | #endif |
| 33 | #include <netinet/in_var.h> |
Simon Kelley | ee87504 | 2018-10-23 22:10:17 +0100 | [diff] [blame] | 34 | #include <netinet6/in6_var.h> |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 35 | |
Simon Kelley | 7de060b | 2011-08-26 17:24:52 +0100 | [diff] [blame] | 36 | #ifndef SA_SIZE |
| 37 | #define SA_SIZE(sa) \ |
| 38 | ( (!(sa) || ((struct sockaddr *)(sa))->sa_len == 0) ? \ |
| 39 | sizeof(long) : \ |
| 40 | 1 + ( (((struct sockaddr *)(sa))->sa_len - 1) | (sizeof(long) - 1) ) ) |
| 41 | #endif |
| 42 | |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 43 | #ifdef HAVE_BSD_NETWORK |
| 44 | static int del_family = 0; |
Simon Kelley | cc921df | 2019-01-02 22:48:59 +0000 | [diff] [blame] | 45 | static union all_addr del_addr; |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 46 | #endif |
| 47 | |
| 48 | #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) |
| 49 | |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 50 | int arp_enumerate(void *parm, int (*callback)()) |
| 51 | { |
| 52 | int mib[6]; |
| 53 | size_t needed; |
| 54 | char *next; |
| 55 | struct rt_msghdr *rtm; |
| 56 | struct sockaddr_inarp *sin2; |
| 57 | struct sockaddr_dl *sdl; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 58 | struct iovec buff; |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 59 | int rc; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 60 | |
| 61 | buff.iov_base = NULL; |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 62 | buff.iov_len = 0; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 63 | |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 64 | mib[0] = CTL_NET; |
| 65 | mib[1] = PF_ROUTE; |
| 66 | mib[2] = 0; |
| 67 | mib[3] = AF_INET; |
| 68 | mib[4] = NET_RT_FLAGS; |
| 69 | #ifdef RTF_LLINFO |
| 70 | mib[5] = RTF_LLINFO; |
| 71 | #else |
| 72 | mib[5] = 0; |
| 73 | #endif |
| 74 | if (sysctl(mib, 6, NULL, &needed, NULL, 0) == -1 || needed == 0) |
| 75 | return 0; |
| 76 | |
| 77 | while (1) |
| 78 | { |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 79 | if (!expand_buf(&buff, needed)) |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 80 | return 0; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 81 | if ((rc = sysctl(mib, 6, buff.iov_base, &needed, NULL, 0)) == 0 || |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 82 | errno != ENOMEM) |
| 83 | break; |
| 84 | needed += needed / 8; |
| 85 | } |
| 86 | if (rc == -1) |
| 87 | return 0; |
| 88 | |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 89 | for (next = buff.iov_base ; next < (char *)buff.iov_base + needed; next += rtm->rtm_msglen) |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 90 | { |
| 91 | rtm = (struct rt_msghdr *)next; |
| 92 | sin2 = (struct sockaddr_inarp *)(rtm + 1); |
| 93 | sdl = (struct sockaddr_dl *)((char *)sin2 + SA_SIZE(sin2)); |
| 94 | if (!(*callback)(AF_INET, &sin2->sin_addr, LLADDR(sdl), sdl->sdl_alen, parm)) |
| 95 | return 0; |
| 96 | } |
| 97 | |
| 98 | return 1; |
| 99 | } |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 100 | #endif /* defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) */ |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 101 | |
| 102 | |
| 103 | int iface_enumerate(int family, void *parm, int (*callback)()) |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 104 | { |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 105 | struct ifaddrs *head, *addrs; |
Josh Soref | 730c674 | 2017-02-06 16:14:04 +0000 | [diff] [blame] | 106 | int errsave, fd = -1, ret = 0; |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 107 | |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 108 | if (family == AF_UNSPEC) |
| 109 | #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) |
| 110 | return arp_enumerate(parm, callback); |
| 111 | #else |
| 112 | return 0; /* need code for Solaris and MacOS*/ |
| 113 | #endif |
| 114 | |
Simon Kelley | 6aef600 | 2012-02-11 22:01:50 +0000 | [diff] [blame] | 115 | /* AF_LINK doesn't exist in Linux, so we can't use it in our API */ |
| 116 | if (family == AF_LOCAL) |
| 117 | family = AF_LINK; |
| 118 | |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 119 | if (getifaddrs(&head) == -1) |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 120 | return 0; |
Simon Kelley | 73a08a2 | 2009-02-05 20:28:08 +0000 | [diff] [blame] | 121 | |
Simon Kelley | ee87504 | 2018-10-23 22:10:17 +0100 | [diff] [blame] | 122 | #if defined(HAVE_BSD_NETWORK) |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 123 | if (family == AF_INET6) |
| 124 | fd = socket(PF_INET6, SOCK_DGRAM, 0); |
| 125 | #endif |
| 126 | |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 127 | for (addrs = head; addrs; addrs = addrs->ifa_next) |
| 128 | { |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 129 | if (addrs->ifa_addr->sa_family == family) |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 130 | { |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 131 | int iface_index = if_nametoindex(addrs->ifa_name); |
| 132 | |
Simon Kelley | fc4c4fd | 2013-07-26 15:38:59 +0100 | [diff] [blame] | 133 | if (iface_index == 0 || !addrs->ifa_addr || |
| 134 | (!addrs->ifa_netmask && family != AF_LINK)) |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 135 | continue; |
| 136 | |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 137 | if (family == AF_INET) |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 138 | { |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 139 | struct in_addr addr, netmask, broadcast; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 140 | addr = ((struct sockaddr_in *) addrs->ifa_addr)->sin_addr; |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 141 | #ifdef HAVE_BSD_NETWORK |
Simon Kelley | cc921df | 2019-01-02 22:48:59 +0000 | [diff] [blame] | 142 | if (del_family == AF_INET && del_addr.addr4.s_addr == addr.s_addr) |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 143 | continue; |
| 144 | #endif |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 145 | netmask = ((struct sockaddr_in *) addrs->ifa_netmask)->sin_addr; |
Simon Kelley | 39f6a04 | 2013-01-09 19:57:47 +0000 | [diff] [blame] | 146 | if (addrs->ifa_broadaddr) |
| 147 | broadcast = ((struct sockaddr_in *) addrs->ifa_broadaddr)->sin_addr; |
| 148 | else |
| 149 | broadcast.s_addr = 0; |
Simon Kelley | 3f2873d | 2013-05-14 11:28:47 +0100 | [diff] [blame] | 150 | if (!((*callback)(addr, iface_index, NULL, netmask, broadcast, parm))) |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 151 | goto err; |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 152 | } |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 153 | else if (family == AF_INET6) |
| 154 | { |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 155 | struct in6_addr *addr = &((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_addr; |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 156 | unsigned char *netmask = (unsigned char *) &((struct sockaddr_in6 *) addrs->ifa_netmask)->sin6_addr; |
| 157 | int scope_id = ((struct sockaddr_in6 *) addrs->ifa_addr)->sin6_scope_id; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 158 | int i, j, prefix = 0; |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 159 | u32 valid = 0xffffffff, preferred = 0xffffffff; |
| 160 | int flags = 0; |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 161 | #ifdef HAVE_BSD_NETWORK |
Simon Kelley | cc921df | 2019-01-02 22:48:59 +0000 | [diff] [blame] | 162 | if (del_family == AF_INET6 && IN6_ARE_ADDR_EQUAL(&del_addr.addr6, addr)) |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 163 | continue; |
| 164 | #endif |
Jeremy Lavergne | 50d7f72 | 2013-10-28 11:26:30 +0000 | [diff] [blame] | 165 | #if defined(HAVE_BSD_NETWORK) && !defined(__APPLE__) |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 166 | struct in6_ifreq ifr6; |
| 167 | |
| 168 | memset(&ifr6, 0, sizeof(ifr6)); |
Petr MenÅ¡Ãk | 47b45b2 | 2018-08-15 18:17:00 +0200 | [diff] [blame] | 169 | safe_strncpy(ifr6.ifr_name, addrs->ifa_name, sizeof(ifr6.ifr_name)); |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 170 | |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 171 | ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr); |
| 172 | if (fd != -1 && ioctl(fd, SIOCGIFAFLAG_IN6, &ifr6) != -1) |
| 173 | { |
| 174 | if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_TENTATIVE) |
| 175 | flags |= IFACE_TENTATIVE; |
| 176 | |
| 177 | if (ifr6.ifr_ifru.ifru_flags6 & IN6_IFF_DEPRECATED) |
| 178 | flags |= IFACE_DEPRECATED; |
Vladislav Grishenko | 4568a6f | 2013-08-19 16:07:07 +0100 | [diff] [blame] | 179 | |
Simon Kelley | 1b55190 | 2013-09-23 15:03:05 +0100 | [diff] [blame] | 180 | #ifdef IN6_IFF_TEMPORARY |
Vladislav Grishenko | 4568a6f | 2013-08-19 16:07:07 +0100 | [diff] [blame] | 181 | if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_TEMPORARY))) |
| 182 | flags |= IFACE_PERMANENT; |
Simon Kelley | 1b55190 | 2013-09-23 15:03:05 +0100 | [diff] [blame] | 183 | #endif |
Vladislav Grishenko | 4568a6f | 2013-08-19 16:07:07 +0100 | [diff] [blame] | 184 | |
Simon Kelley | 1b55190 | 2013-09-23 15:03:05 +0100 | [diff] [blame] | 185 | #ifdef IN6_IFF_PRIVACY |
| 186 | if (!(ifr6.ifr_ifru.ifru_flags6 & (IN6_IFF_AUTOCONF | IN6_IFF_PRIVACY))) |
| 187 | flags |= IFACE_PERMANENT; |
| 188 | #endif |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 189 | } |
| 190 | |
| 191 | ifr6.ifr_addr = *((struct sockaddr_in6 *) addrs->ifa_addr); |
| 192 | if (fd != -1 && ioctl(fd, SIOCGIFALIFETIME_IN6, &ifr6) != -1) |
| 193 | { |
| 194 | valid = ifr6.ifr_ifru.ifru_lifetime.ia6t_vltime; |
| 195 | preferred = ifr6.ifr_ifru.ifru_lifetime.ia6t_pltime; |
| 196 | } |
| 197 | #endif |
| 198 | |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 199 | for (i = 0; i < IN6ADDRSZ; i++, prefix += 8) |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 200 | if (netmask[i] != 0xff) |
| 201 | break; |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 202 | |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 203 | if (i != IN6ADDRSZ && netmask[i]) |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 204 | for (j = 7; j > 0; j--, prefix++) |
| 205 | if ((netmask[i] & (1 << j)) == 0) |
| 206 | break; |
| 207 | |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 208 | /* voodoo to clear interface field in address */ |
| 209 | if (!option_bool(OPT_NOWILD) && IN6_IS_ADDR_LINKLOCAL(addr)) |
| 210 | { |
| 211 | addr->s6_addr[2] = 0; |
| 212 | addr->s6_addr[3] = 0; |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 213 | } |
| 214 | |
| 215 | if (!((*callback)(addr, prefix, scope_id, iface_index, flags, |
| 216 | (int) preferred, (int)valid, parm))) |
| 217 | goto err; |
| 218 | } |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 219 | |
Simon Kelley | 6aef600 | 2012-02-11 22:01:50 +0000 | [diff] [blame] | 220 | #ifdef HAVE_DHCP6 |
| 221 | else if (family == AF_LINK) |
| 222 | { |
| 223 | /* Assume ethernet again here */ |
Simon Kelley | 96fafe2 | 2012-03-07 20:25:39 +0000 | [diff] [blame] | 224 | struct sockaddr_dl *sdl = (struct sockaddr_dl *) addrs->ifa_addr; |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 225 | if (sdl->sdl_alen != 0 && |
| 226 | !((*callback)(iface_index, ARPHRD_ETHER, LLADDR(sdl), sdl->sdl_alen, parm))) |
Simon Kelley | 6aef600 | 2012-02-11 22:01:50 +0000 | [diff] [blame] | 227 | goto err; |
| 228 | } |
| 229 | #endif |
Simon Kelley | 28866e9 | 2011-02-14 20:19:14 +0000 | [diff] [blame] | 230 | } |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 231 | } |
| 232 | |
| 233 | ret = 1; |
| 234 | |
| 235 | err: |
Josh Soref | 730c674 | 2017-02-06 16:14:04 +0000 | [diff] [blame] | 236 | errsave = errno; |
Vladislav Grishenko | 8c3bdb4 | 2013-08-19 14:04:38 +0100 | [diff] [blame] | 237 | freeifaddrs(head); |
| 238 | if (fd != -1) |
| 239 | close(fd); |
Josh Soref | 730c674 | 2017-02-06 16:14:04 +0000 | [diff] [blame] | 240 | errno = errsave; |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 241 | |
| 242 | return ret; |
| 243 | } |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 244 | #endif /* defined(HAVE_BSD_NETWORK) || defined(HAVE_SOLARIS_NETWORK) */ |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 245 | |
| 246 | |
Simon Kelley | 7622fc0 | 2009-06-04 20:32:05 +0100 | [diff] [blame] | 247 | #if defined(HAVE_BSD_NETWORK) && defined(HAVE_DHCP) |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 248 | #include <net/bpf.h> |
| 249 | |
Simon Kelley | 5aabfc7 | 2007-08-29 11:24:47 +0100 | [diff] [blame] | 250 | void init_bpf(void) |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 251 | { |
| 252 | int i = 0; |
| 253 | |
| 254 | while (1) |
| 255 | { |
Simon Kelley | 08456c6 | 2012-03-07 19:08:11 +0000 | [diff] [blame] | 256 | sprintf(daemon->dhcp_buff, "/dev/bpf%d", i++); |
| 257 | if ((daemon->dhcp_raw_fd = open(daemon->dhcp_buff, O_RDWR, 0)) != -1) |
| 258 | return; |
| 259 | |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 260 | if (errno != EBUSY) |
Simon Kelley | 5aabfc7 | 2007-08-29 11:24:47 +0100 | [diff] [blame] | 261 | die(_("cannot create DHCP BPF socket: %s"), NULL, EC_BADNET); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 262 | } |
| 263 | } |
| 264 | |
Simon Kelley | 5aabfc7 | 2007-08-29 11:24:47 +0100 | [diff] [blame] | 265 | void send_via_bpf(struct dhcp_packet *mess, size_t len, |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 266 | struct in_addr iface_addr, struct ifreq *ifr) |
| 267 | { |
| 268 | /* Hairy stuff, packet either has to go to the |
| 269 | net broadcast or the destination can't reply to ARP yet, |
| 270 | but we do know the physical address. |
| 271 | Build the packet by steam, and send directly, bypassing |
| 272 | the kernel IP stack */ |
| 273 | |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 274 | struct ether_header ether; |
| 275 | struct ip ip; |
| 276 | struct udphdr { |
| 277 | u16 uh_sport; /* source port */ |
| 278 | u16 uh_dport; /* destination port */ |
| 279 | u16 uh_ulen; /* udp length */ |
| 280 | u16 uh_sum; /* udp checksum */ |
| 281 | } udp; |
| 282 | |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 283 | u32 i, sum; |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 284 | struct iovec iov[4]; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 285 | |
| 286 | /* Only know how to do ethernet on *BSD */ |
| 287 | if (mess->htype != ARPHRD_ETHER || mess->hlen != ETHER_ADDR_LEN) |
| 288 | { |
Simon Kelley | 7622fc0 | 2009-06-04 20:32:05 +0100 | [diff] [blame] | 289 | my_syslog(MS_DHCP | LOG_WARNING, _("DHCP request for unsupported hardware type (%d) received on %s"), |
Simon Kelley | f2621c7 | 2007-04-29 19:47:21 +0100 | [diff] [blame] | 290 | mess->htype, ifr->ifr_name); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 291 | return; |
| 292 | } |
| 293 | |
| 294 | ifr->ifr_addr.sa_family = AF_LINK; |
| 295 | if (ioctl(daemon->dhcpfd, SIOCGIFADDR, ifr) < 0) |
| 296 | return; |
| 297 | |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 298 | memcpy(ether.ether_shost, LLADDR((struct sockaddr_dl *)&ifr->ifr_addr), ETHER_ADDR_LEN); |
| 299 | ether.ether_type = htons(ETHERTYPE_IP); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 300 | |
| 301 | if (ntohs(mess->flags) & 0x8000) |
| 302 | { |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 303 | memset(ether.ether_dhost, 255, ETHER_ADDR_LEN); |
| 304 | ip.ip_dst.s_addr = INADDR_BROADCAST; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 305 | } |
| 306 | else |
| 307 | { |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 308 | memcpy(ether.ether_dhost, mess->chaddr, ETHER_ADDR_LEN); |
| 309 | ip.ip_dst.s_addr = mess->yiaddr.s_addr; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 310 | } |
| 311 | |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 312 | ip.ip_p = IPPROTO_UDP; |
| 313 | ip.ip_src.s_addr = iface_addr.s_addr; |
| 314 | ip.ip_len = htons(sizeof(struct ip) + |
| 315 | sizeof(struct udphdr) + |
| 316 | len) ; |
| 317 | ip.ip_hl = sizeof(struct ip) / 4; |
| 318 | ip.ip_v = IPVERSION; |
| 319 | ip.ip_tos = 0; |
| 320 | ip.ip_id = htons(0); |
| 321 | ip.ip_off = htons(0x4000); /* don't fragment */ |
| 322 | ip.ip_ttl = IPDEFTTL; |
| 323 | ip.ip_sum = 0; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 324 | for (sum = 0, i = 0; i < sizeof(struct ip) / 2; i++) |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 325 | sum += ((u16 *)&ip)[i]; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 326 | while (sum>>16) |
| 327 | sum = (sum & 0xffff) + (sum >> 16); |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 328 | ip.ip_sum = (sum == 0xffff) ? sum : ~sum; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 329 | |
Simon Kelley | 9e03894 | 2008-05-30 20:06:34 +0100 | [diff] [blame] | 330 | udp.uh_sport = htons(daemon->dhcp_server_port); |
| 331 | udp.uh_dport = htons(daemon->dhcp_client_port); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 332 | if (len & 1) |
| 333 | ((char *)mess)[len] = 0; /* for checksum, in case length is odd. */ |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 334 | udp.uh_sum = 0; |
| 335 | udp.uh_ulen = sum = htons(sizeof(struct udphdr) + len); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 336 | sum += htons(IPPROTO_UDP); |
Simon Kelley | 824af85 | 2008-02-12 20:43:05 +0000 | [diff] [blame] | 337 | sum += ip.ip_src.s_addr & 0xffff; |
| 338 | sum += (ip.ip_src.s_addr >> 16) & 0xffff; |
| 339 | sum += ip.ip_dst.s_addr & 0xffff; |
| 340 | sum += (ip.ip_dst.s_addr >> 16) & 0xffff; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 341 | for (i = 0; i < sizeof(struct udphdr)/2; i++) |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 342 | sum += ((u16 *)&udp)[i]; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 343 | for (i = 0; i < (len + 1) / 2; i++) |
| 344 | sum += ((u16 *)mess)[i]; |
| 345 | while (sum>>16) |
| 346 | sum = (sum & 0xffff) + (sum >> 16); |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 347 | udp.uh_sum = (sum == 0xffff) ? sum : ~sum; |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 348 | |
| 349 | ioctl(daemon->dhcp_raw_fd, BIOCSETIF, ifr); |
| 350 | |
Simon Kelley | 849a835 | 2006-06-09 21:02:31 +0100 | [diff] [blame] | 351 | iov[0].iov_base = ðer; |
| 352 | iov[0].iov_len = sizeof(ether); |
| 353 | iov[1].iov_base = &ip; |
| 354 | iov[1].iov_len = sizeof(ip); |
| 355 | iov[2].iov_base = &udp; |
| 356 | iov[2].iov_len = sizeof(udp); |
| 357 | iov[3].iov_base = mess; |
| 358 | iov[3].iov_len = len; |
| 359 | |
Simon Kelley | ff841eb | 2015-03-11 21:36:30 +0000 | [diff] [blame] | 360 | while (retry_send(writev(daemon->dhcp_raw_fd, iov, 4))); |
Simon Kelley | 5e9e0ef | 2006-04-17 14:24:29 +0100 | [diff] [blame] | 361 | } |
| 362 | |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 363 | #endif /* defined(HAVE_BSD_NETWORK) && defined(HAVE_DHCP) */ |
| 364 | |
| 365 | |
| 366 | #ifdef HAVE_BSD_NETWORK |
| 367 | |
| 368 | void route_init(void) |
| 369 | { |
| 370 | /* AF_UNSPEC: all addr families */ |
| 371 | daemon->routefd = socket(PF_ROUTE, SOCK_RAW, AF_UNSPEC); |
| 372 | |
| 373 | if (daemon->routefd == -1 || !fix_fd(daemon->routefd)) |
| 374 | die(_("cannot create PF_ROUTE socket: %s"), NULL, EC_BADNET); |
| 375 | } |
| 376 | |
Simon Kelley | a0358e5 | 2014-06-07 13:38:48 +0100 | [diff] [blame] | 377 | void route_sock(void) |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 378 | { |
| 379 | struct if_msghdr *msg; |
| 380 | int rc = recv(daemon->routefd, daemon->packet, daemon->packet_buff_sz, 0); |
| 381 | |
| 382 | if (rc < 4) |
| 383 | return; |
| 384 | |
| 385 | msg = (struct if_msghdr *)daemon->packet; |
| 386 | |
| 387 | if (rc < msg->ifm_msglen) |
| 388 | return; |
| 389 | |
| 390 | if (msg->ifm_version != RTM_VERSION) |
| 391 | { |
| 392 | static int warned = 0; |
| 393 | if (!warned) |
| 394 | { |
| 395 | my_syslog(LOG_WARNING, _("Unknown protocol version from route socket")); |
| 396 | warned = 1; |
| 397 | } |
| 398 | } |
| 399 | else if (msg->ifm_type == RTM_NEWADDR) |
| 400 | { |
| 401 | del_family = 0; |
Simon Kelley | 47a9516 | 2014-07-08 22:22:02 +0100 | [diff] [blame] | 402 | queue_event(EVENT_NEWADDR); |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 403 | } |
| 404 | else if (msg->ifm_type == RTM_DELADDR) |
| 405 | { |
| 406 | /* There's a race in the kernel, such that if we run iface_enumerate() immediately |
| 407 | we get a DELADDR event, the deleted address still appears. Here we store the deleted address |
| 408 | in a static variable, and omit it from the set returned by iface_enumerate() */ |
| 409 | int mask = ((struct ifa_msghdr *)msg)->ifam_addrs; |
| 410 | int maskvec[] = { RTA_DST, RTA_GATEWAY, RTA_NETMASK, RTA_GENMASK, |
| 411 | RTA_IFP, RTA_IFA, RTA_AUTHOR, RTA_BRD }; |
| 412 | int of; |
| 413 | unsigned int i; |
| 414 | |
| 415 | for (i = 0, of = sizeof(struct ifa_msghdr); of < rc && i < sizeof(maskvec)/sizeof(maskvec[0]); i++) |
| 416 | if (mask & maskvec[i]) |
| 417 | { |
| 418 | struct sockaddr *sa = (struct sockaddr *)((char *)msg + of); |
| 419 | size_t diff = (sa->sa_len != 0) ? sa->sa_len : sizeof(long); |
| 420 | |
| 421 | if (maskvec[i] == RTA_IFA) |
| 422 | { |
| 423 | del_family = sa->sa_family; |
| 424 | if (del_family == AF_INET) |
Simon Kelley | cc921df | 2019-01-02 22:48:59 +0000 | [diff] [blame] | 425 | del_addr.addr4 = ((struct sockaddr_in *)sa)->sin_addr; |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 426 | else if (del_family == AF_INET6) |
Simon Kelley | cc921df | 2019-01-02 22:48:59 +0000 | [diff] [blame] | 427 | del_addr.addr6 = ((struct sockaddr_in6 *)sa)->sin6_addr; |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 428 | else |
| 429 | del_family = 0; |
| 430 | } |
| 431 | |
| 432 | of += diff; |
| 433 | /* round up as needed */ |
| 434 | if (diff & (sizeof(long) - 1)) |
| 435 | of += sizeof(long) - (diff & (sizeof(long) - 1)); |
| 436 | } |
| 437 | |
Simon Kelley | 47a9516 | 2014-07-08 22:22:02 +0100 | [diff] [blame] | 438 | queue_event(EVENT_NEWADDR); |
Simon Kelley | 1ee9be4 | 2013-12-09 16:50:19 +0000 | [diff] [blame] | 439 | } |
| 440 | } |
| 441 | |
| 442 | #endif /* HAVE_BSD_NETWORK */ |