174462Salfred/* 274462Salfred * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ 374462Salfred * $FreeBSD: stable/11/usr.sbin/rpcbind/util.c 330449 2018-03-05 07:26:05Z eadler $ 474462Salfred */ 574462Salfred 674462Salfred/*- 7330449Seadler * SPDX-License-Identifier: BSD-2-Clause-NetBSD 8330449Seadler * 974462Salfred * Copyright (c) 2000 The NetBSD Foundation, Inc. 1074462Salfred * All rights reserved. 1174462Salfred * 1274462Salfred * This code is derived from software contributed to The NetBSD Foundation 1374462Salfred * by Frank van der Linden. 1474462Salfred * 1574462Salfred * Redistribution and use in source and binary forms, with or without 1674462Salfred * modification, are permitted provided that the following conditions 1774462Salfred * are met: 1874462Salfred * 1. Redistributions of source code must retain the above copyright 1974462Salfred * notice, this list of conditions and the following disclaimer. 2074462Salfred * 2. Redistributions in binary form must reproduce the above copyright 2174462Salfred * notice, this list of conditions and the following disclaimer in the 2274462Salfred * documentation and/or other materials provided with the distribution. 2374462Salfred * 2474462Salfred * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 2574462Salfred * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 2674462Salfred * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2774462Salfred * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 2874462Salfred * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 2974462Salfred * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 3074462Salfred * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 3174462Salfred * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 3274462Salfred * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 3374462Salfred * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3474462Salfred * POSSIBILITY OF SUCH DAMAGE. 3574462Salfred */ 3674462Salfred 3774462Salfred#include <sys/types.h> 3874462Salfred#include <sys/socket.h> 3974462Salfred#include <sys/queue.h> 4074462Salfred#include <net/if.h> 4174462Salfred#include <netinet/in.h> 4274462Salfred#include <ifaddrs.h> 4374462Salfred#include <sys/poll.h> 4474462Salfred#include <rpc/rpc.h> 4574462Salfred#include <errno.h> 4674462Salfred#include <stdlib.h> 4774462Salfred#include <string.h> 4874462Salfred#include <unistd.h> 4974462Salfred#include <netdb.h> 5074462Salfred#include <netconfig.h> 5174462Salfred#include <stdio.h> 5274462Salfred#include <arpa/inet.h> 5374462Salfred 5474462Salfred#include "rpcbind.h" 5574462Salfred 5674462Salfredstatic struct sockaddr_in *local_in4; 5774462Salfred#ifdef INET6 5874462Salfredstatic struct sockaddr_in6 *local_in6; 5974462Salfred#endif 6074462Salfred 61293229Sasomersstatic int bitmaskcmp(struct sockaddr *, struct sockaddr *, struct sockaddr *); 6274462Salfred 6374462Salfred/* 6474462Salfred * For all bits set in "mask", compare the corresponding bits in 6579720Siedowse * "dst" and "src", and see if they match. Returns 0 if the addresses 6679720Siedowse * match. 6774462Salfred */ 6874462Salfredstatic int 69293229Sasomersbitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask) 7074462Salfred{ 7179720Siedowse int i; 72293229Sasomers u_int8_t *p1, *p2, *netmask; 73293229Sasomers int bytelen; 7474462Salfred 75293229Sasomers if (dst->sa_family != src->sa_family || 76293229Sasomers dst->sa_family != mask->sa_family) 77293229Sasomers return (1); 78293229Sasomers 79293229Sasomers switch (dst->sa_family) { 80293229Sasomers case AF_INET: 81293229Sasomers p1 = (uint8_t*) &SA2SINADDR(dst); 82293229Sasomers p2 = (uint8_t*) &SA2SINADDR(src); 83293229Sasomers netmask = (uint8_t*) &SA2SINADDR(mask); 84293229Sasomers bytelen = sizeof(struct in_addr); 85293229Sasomers break; 86293229Sasomers#ifdef INET6 87293229Sasomers case AF_INET6: 88293229Sasomers p1 = (uint8_t*) &SA2SIN6ADDR(dst); 89293229Sasomers p2 = (uint8_t*) &SA2SIN6ADDR(src); 90293229Sasomers netmask = (uint8_t*) &SA2SIN6ADDR(mask); 91293229Sasomers bytelen = sizeof(struct in6_addr); 92293229Sasomers break; 93293229Sasomers#endif 94293229Sasomers default: 95293229Sasomers return (1); 96293229Sasomers } 97293229Sasomers 9879720Siedowse for (i = 0; i < bytelen; i++) 9979720Siedowse if ((p1[i] & netmask[i]) != (p2[i] & netmask[i])) 10079720Siedowse return (1); 10179720Siedowse return (0); 10274462Salfred} 10374462Salfred 10474462Salfred/* 10578705Siedowse * Find a server address that can be used by `caller' to contact 10678705Siedowse * the local service specified by `serv_uaddr'. If `clnt_uaddr' is 10778705Siedowse * non-NULL, it is used instead of `caller' as a hint suggesting 10878705Siedowse * the best address (e.g. the `r_addr' field of an rpc, which 10978705Siedowse * contains the rpcbind server address that the caller used). 11078705Siedowse * 11178705Siedowse * Returns the best server address as a malloc'd "universal address" 11278705Siedowse * string which should be freed by the caller. On error, returns NULL. 11378705Siedowse */ 11474462Salfredchar * 115293229Sasomersaddrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr, 116293229Sasomers const char *netid) 11774462Salfred{ 11878705Siedowse struct ifaddrs *ifap, *ifp = NULL, *bestif; 11978705Siedowse struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf; 12078705Siedowse struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa; 12174462Salfred struct sockaddr_storage ss; 12274462Salfred struct netconfig *nconf; 123293229Sasomers char *caller_uaddr = NULL; 124300867Sngie#ifdef ND_DEBUG 125293229Sasomers const char *hint_uaddr = NULL; 126300867Sngie#endif 12774462Salfred char *ret = NULL; 128293229Sasomers int bestif_goodness; 12974462Salfred 13074462Salfred#ifdef ND_DEBUG 13174462Salfred if (debugging) 13274462Salfred fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 13378705Siedowse clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); 13474462Salfred#endif 13578705Siedowse caller_sa = caller->buf; 13678705Siedowse if ((nconf = rpcbind_get_conf(netid)) == NULL) 13778705Siedowse goto freeit; 13878705Siedowse if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL) 13978705Siedowse goto freeit; 14074462Salfred 14174462Salfred /* 14278705Siedowse * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its 14378705Siedowse * address family is different from that of the caller. 14474462Salfred */ 14578705Siedowse hint_sa = NULL; 14674462Salfred if (clnt_uaddr != NULL) { 147300867Sngie#ifdef ND_DEBUG 14878705Siedowse hint_uaddr = clnt_uaddr; 149300867Sngie#endif 15078705Siedowse if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL) 15178705Siedowse goto freeit; 15278705Siedowse hint_sa = hint_nbp->buf; 15374462Salfred } 15478705Siedowse if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) { 155300867Sngie#ifdef ND_DEBUG 15678705Siedowse hint_uaddr = caller_uaddr; 157300867Sngie#endif 15878705Siedowse hint_sa = caller->buf; 15978705Siedowse } 16074462Salfred 16178705Siedowse#ifdef ND_DEBUG 16278705Siedowse if (debugging) 16378705Siedowse fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr); 16478705Siedowse#endif 16578705Siedowse /* Local caller, just return the server address. */ 16678705Siedowse if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 || 16778705Siedowse strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') { 16878705Siedowse ret = strdup(serv_uaddr); 16978705Siedowse goto freeit; 17076037Siedowse } 17174462Salfred 17278705Siedowse if (getifaddrs(&ifp) < 0) 17378705Siedowse goto freeit; 17478705Siedowse 17574462Salfred /* 176293229Sasomers * Loop through all interface addresses. We are listening to an address 177293229Sasomers * if any of the following are true: 178293229Sasomers * a) It's a loopback address 179293229Sasomers * b) It was specified with the -h command line option 180293229Sasomers * c) There were no -h command line options. 181293229Sasomers * 182293229Sasomers * Among addresses on which we are listening, choose in order of 183293229Sasomers * preference an address that is: 184293229Sasomers * 185293229Sasomers * a) Equal to the hint 186293229Sasomers * b) A link local address with the same scope ID as the client's 187293229Sasomers * address, if the client's address is also link local 188293229Sasomers * c) An address on the same subnet as the client's address 189293229Sasomers * d) A non-localhost, non-p2p address 190293229Sasomers * e) Any usable address 19174462Salfred */ 19278705Siedowse bestif = NULL; 193293229Sasomers bestif_goodness = 0; 19474462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 19578705Siedowse ifsa = ifap->ifa_addr; 19678705Siedowse ifmasksa = ifap->ifa_netmask; 19778705Siedowse 198293229Sasomers /* Skip addresses where we don't listen */ 19978705Siedowse if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || 20074462Salfred !(ifap->ifa_flags & IFF_UP)) 20174462Salfred continue; 20274462Salfred 203203710Simp if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) 204203710Simp continue; 205203710Simp 206293229Sasomers if ((hint_sa->sa_family == AF_INET) && 207293229Sasomers ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr == 208293229Sasomers ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) { 209293229Sasomers const int goodness = 4; 210293229Sasomers 211293229Sasomers bestif_goodness = goodness; 212293229Sasomers bestif = ifap; 213293229Sasomers goto found; 214293229Sasomers } 21574462Salfred#ifdef INET6 216293229Sasomers if ((hint_sa->sa_family == AF_INET6) && 217293229Sasomers (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr, 218293229Sasomers &((struct sockaddr_in6*)ifsa)->sin6_addr, 219293229Sasomers sizeof(struct in6_addr))) && 220293229Sasomers (((struct sockaddr_in6*)hint_sa)->sin6_scope_id == 221293229Sasomers (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) { 222293229Sasomers const int goodness = 4; 223293229Sasomers 224293229Sasomers bestif_goodness = goodness; 225293229Sasomers bestif = ifap; 226293229Sasomers goto found; 227293229Sasomers } 228293229Sasomers if (hint_sa->sa_family == AF_INET6) { 22974462Salfred /* 23078705Siedowse * For v6 link local addresses, if the caller is on 23178705Siedowse * a link-local address then use the scope id to see 23278705Siedowse * which one. 23374462Salfred */ 23478705Siedowse if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && 23578705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && 23678705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { 23778705Siedowse if (SA2SIN6(ifsa)->sin6_scope_id == 23878705Siedowse SA2SIN6(caller_sa)->sin6_scope_id) { 239293229Sasomers const int goodness = 3; 240293229Sasomers 241293229Sasomers if (bestif_goodness < goodness) { 242293229Sasomers bestif = ifap; 243293229Sasomers bestif_goodness = goodness; 244293229Sasomers } 24578705Siedowse } 246293229Sasomers } 247293229Sasomers } 248293229Sasomers#endif /* INET6 */ 249293229Sasomers if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) { 250293229Sasomers const int goodness = 2; 251293229Sasomers 252293229Sasomers if (bestif_goodness < goodness) { 25378705Siedowse bestif = ifap; 254293229Sasomers bestif_goodness = goodness; 25574462Salfred } 25674462Salfred } 257293229Sasomers if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 258293229Sasomers const int goodness = 1; 25978705Siedowse 260293229Sasomers if (bestif_goodness < goodness) { 261293229Sasomers bestif = ifap; 262293229Sasomers bestif_goodness = goodness; 263293229Sasomers } 264293229Sasomers } 265293229Sasomers if (bestif == NULL) 26674462Salfred bestif = ifap; 26774462Salfred } 26878705Siedowse if (bestif == NULL) 26978705Siedowse goto freeit; 27078705Siedowse 27174462Salfredfound: 27278705Siedowse /* 273218909Sbrucec * Construct the new address using the address from 27478705Siedowse * `bestif', and the port number from `serv_uaddr'. 27578705Siedowse */ 27678705Siedowse serv_nbp = uaddr2taddr(nconf, serv_uaddr); 27778705Siedowse if (serv_nbp == NULL) 27878705Siedowse goto freeit; 27978705Siedowse serv_sa = serv_nbp->buf; 28078705Siedowse 28178705Siedowse memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len); 28278705Siedowse switch (ss.ss_family) { 28376037Siedowse case AF_INET: 28478705Siedowse SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port; 28578705Siedowse break; 28676037Siedowse#ifdef INET6 28776037Siedowse case AF_INET6: 28878705Siedowse SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port; 28976037Siedowse break; 29076037Siedowse#endif 29176037Siedowse } 29278705Siedowse tbuf.len = ss.ss_len; 29378705Siedowse tbuf.maxlen = sizeof(ss); 29478705Siedowse tbuf.buf = &ss; 29578705Siedowse ret = taddr2uaddr(nconf, &tbuf); 29678705Siedowse 29774462Salfredfreeit: 298300945Sngie free(caller_uaddr); 29978705Siedowse if (hint_nbp != NULL) { 30078705Siedowse free(hint_nbp->buf); 30178705Siedowse free(hint_nbp); 30278705Siedowse } 30378705Siedowse if (serv_nbp != NULL) { 30478705Siedowse free(serv_nbp->buf); 30578705Siedowse free(serv_nbp); 30678705Siedowse } 30778705Siedowse if (ifp != NULL) 30878705Siedowse freeifaddrs(ifp); 30974462Salfred 31074462Salfred#ifdef ND_DEBUG 31174462Salfred if (debugging) 31274462Salfred fprintf(stderr, "addrmerge: returning %s\n", ret); 31374462Salfred#endif 31474462Salfred return ret; 31574462Salfred} 31674462Salfred 31774462Salfredvoid 318224001Sdelphijnetwork_init(void) 31974462Salfred{ 32074462Salfred#ifdef INET6 32174462Salfred struct ifaddrs *ifap, *ifp; 32274462Salfred struct ipv6_mreq mreq6; 323104592Salfred unsigned int ifindex; 324104592Salfred int s; 32574462Salfred#endif 32674462Salfred int ecode; 32774462Salfred struct addrinfo hints, *res; 32874462Salfred 32974462Salfred memset(&hints, 0, sizeof hints); 33074462Salfred hints.ai_family = AF_INET; 33174462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 33274462Salfred if (debugging) 33374462Salfred fprintf(stderr, "can't get local ip4 address: %s\n", 33474462Salfred gai_strerror(ecode)); 33574462Salfred } else { 33674462Salfred local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 33774462Salfred if (local_in4 == NULL) { 33874462Salfred if (debugging) 33974462Salfred fprintf(stderr, "can't alloc local ip4 addr\n"); 340300932Sngie exit(1); 34174462Salfred } 34274462Salfred memcpy(local_in4, res->ai_addr, sizeof *local_in4); 343300972Smarkj freeaddrinfo(res); 34474462Salfred } 34574462Salfred 34674462Salfred#ifdef INET6 34774462Salfred hints.ai_family = AF_INET6; 34874462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 34974462Salfred if (debugging) 35074462Salfred fprintf(stderr, "can't get local ip6 address: %s\n", 35174462Salfred gai_strerror(ecode)); 35274462Salfred } else { 35374462Salfred local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 35474462Salfred if (local_in6 == NULL) { 35574462Salfred if (debugging) 35674462Salfred fprintf(stderr, "can't alloc local ip6 addr\n"); 357300932Sngie exit(1); 35874462Salfred } 35974462Salfred memcpy(local_in6, res->ai_addr, sizeof *local_in6); 360300972Smarkj freeaddrinfo(res); 36174462Salfred } 36274462Salfred 36374462Salfred /* 36474462Salfred * Now join the RPC ipv6 multicast group on all interfaces. 36574462Salfred */ 36674462Salfred if (getifaddrs(&ifp) < 0) 36774462Salfred return; 36874462Salfred 36974462Salfred mreq6.ipv6mr_interface = 0; 37074462Salfred inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 37174462Salfred 37274462Salfred s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 373300932Sngie if (s == -1) { 374300932Sngie if (debugging) 375300932Sngie fprintf(stderr, "couldn't create ip6 socket"); 376300973Sngie goto done_inet6; 377300932Sngie } 37874462Salfred 37974462Salfred /* 38079720Siedowse * Loop through all interfaces. For each IPv6 multicast-capable 38179720Siedowse * interface, join the RPC multicast group on that interface. 38274462Salfred */ 38374462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 38474462Salfred if (ifap->ifa_addr->sa_family != AF_INET6 || 38574462Salfred !(ifap->ifa_flags & IFF_MULTICAST)) 38674462Salfred continue; 38774462Salfred ifindex = if_nametoindex(ifap->ifa_name); 38874462Salfred if (ifindex == mreq6.ipv6mr_interface) 38974462Salfred /* 39074462Salfred * Already did this one. 39174462Salfred */ 39274462Salfred continue; 39374462Salfred mreq6.ipv6mr_interface = ifindex; 39474462Salfred if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 39574462Salfred sizeof mreq6) < 0) 39674462Salfred if (debugging) 39774462Salfred perror("setsockopt v6 multicast"); 39874462Salfred } 399300973Sngiedone_inet6: 400300934Sngie freeifaddrs(ifp); 40174462Salfred#endif 40274462Salfred 40374462Salfred /* close(s); */ 40474462Salfred} 40574462Salfred 40674462Salfredstruct sockaddr * 40774462Salfredlocal_sa(int af) 40874462Salfred{ 40974462Salfred switch (af) { 41074462Salfred case AF_INET: 41174462Salfred return (struct sockaddr *)local_in4; 41274462Salfred#ifdef INET6 41374462Salfred case AF_INET6: 41474462Salfred return (struct sockaddr *)local_in6; 41574462Salfred#endif 41674462Salfred default: 41774462Salfred return NULL; 41874462Salfred } 41974462Salfred} 420