174462Salfred/* 274462Salfred * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ 374462Salfred * $FreeBSD$ 474462Salfred */ 574462Salfred 674462Salfred/*- 774462Salfred * Copyright (c) 2000 The NetBSD Foundation, Inc. 874462Salfred * All rights reserved. 974462Salfred * 1074462Salfred * This code is derived from software contributed to The NetBSD Foundation 1174462Salfred * by Frank van der Linden. 1274462Salfred * 1374462Salfred * Redistribution and use in source and binary forms, with or without 1474462Salfred * modification, are permitted provided that the following conditions 1574462Salfred * are met: 1674462Salfred * 1. Redistributions of source code must retain the above copyright 1774462Salfred * notice, this list of conditions and the following disclaimer. 1874462Salfred * 2. Redistributions in binary form must reproduce the above copyright 1974462Salfred * notice, this list of conditions and the following disclaimer in the 2074462Salfred * documentation and/or other materials provided with the distribution. 2174462Salfred * 2274462Salfred * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS 2374462Salfred * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED 2474462Salfred * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR 2574462Salfred * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS 2674462Salfred * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR 2774462Salfred * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF 2874462Salfred * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS 2974462Salfred * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN 3074462Salfred * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) 3174462Salfred * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE 3274462Salfred * POSSIBILITY OF SUCH DAMAGE. 3374462Salfred */ 3474462Salfred 3574462Salfred#include <sys/types.h> 3674462Salfred#include <sys/socket.h> 3774462Salfred#include <sys/queue.h> 3874462Salfred#include <net/if.h> 3974462Salfred#include <netinet/in.h> 4074462Salfred#include <ifaddrs.h> 4174462Salfred#include <sys/poll.h> 4274462Salfred#include <rpc/rpc.h> 4374462Salfred#include <errno.h> 4474462Salfred#include <stdlib.h> 4574462Salfred#include <string.h> 4674462Salfred#include <unistd.h> 4774462Salfred#include <netdb.h> 4874462Salfred#include <netconfig.h> 4974462Salfred#include <stdio.h> 5074462Salfred#include <arpa/inet.h> 5174462Salfred 5274462Salfred#include "rpcbind.h" 5374462Salfred 5474462Salfredstatic struct sockaddr_in *local_in4; 5574462Salfred#ifdef INET6 5674462Salfredstatic struct sockaddr_in6 *local_in6; 5774462Salfred#endif 5874462Salfred 59296994Sasomersstatic int bitmaskcmp(struct sockaddr *, struct sockaddr *, struct sockaddr *); 6074462Salfred 6174462Salfred/* 6274462Salfred * For all bits set in "mask", compare the corresponding bits in 6379720Siedowse * "dst" and "src", and see if they match. Returns 0 if the addresses 6479720Siedowse * match. 6574462Salfred */ 6674462Salfredstatic int 67296994Sasomersbitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask) 6874462Salfred{ 6979720Siedowse int i; 70296994Sasomers u_int8_t *p1, *p2, *netmask; 71296994Sasomers int bytelen; 7274462Salfred 73296994Sasomers if (dst->sa_family != src->sa_family || 74296994Sasomers dst->sa_family != mask->sa_family) 75296994Sasomers return (1); 76296994Sasomers 77296994Sasomers switch (dst->sa_family) { 78296994Sasomers case AF_INET: 79296994Sasomers p1 = (uint8_t*) &SA2SINADDR(dst); 80296994Sasomers p2 = (uint8_t*) &SA2SINADDR(src); 81296994Sasomers netmask = (uint8_t*) &SA2SINADDR(mask); 82296994Sasomers bytelen = sizeof(struct in_addr); 83296994Sasomers break; 84296994Sasomers#ifdef INET6 85296994Sasomers case AF_INET6: 86296994Sasomers p1 = (uint8_t*) &SA2SIN6ADDR(dst); 87296994Sasomers p2 = (uint8_t*) &SA2SIN6ADDR(src); 88296994Sasomers netmask = (uint8_t*) &SA2SIN6ADDR(mask); 89296994Sasomers bytelen = sizeof(struct in6_addr); 90296994Sasomers break; 91296994Sasomers#endif 92296994Sasomers default: 93296994Sasomers return (1); 94296994Sasomers } 95296994Sasomers 9679720Siedowse for (i = 0; i < bytelen; i++) 9779720Siedowse if ((p1[i] & netmask[i]) != (p2[i] & netmask[i])) 9879720Siedowse return (1); 9979720Siedowse return (0); 10074462Salfred} 10174462Salfred 10274462Salfred/* 10378705Siedowse * Find a server address that can be used by `caller' to contact 10478705Siedowse * the local service specified by `serv_uaddr'. If `clnt_uaddr' is 10578705Siedowse * non-NULL, it is used instead of `caller' as a hint suggesting 10678705Siedowse * the best address (e.g. the `r_addr' field of an rpc, which 10778705Siedowse * contains the rpcbind server address that the caller used). 10878705Siedowse * 10978705Siedowse * Returns the best server address as a malloc'd "universal address" 11078705Siedowse * string which should be freed by the caller. On error, returns NULL. 11178705Siedowse */ 11274462Salfredchar * 113296994Sasomersaddrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr, 114296994Sasomers const char *netid) 11574462Salfred{ 11678705Siedowse struct ifaddrs *ifap, *ifp = NULL, *bestif; 11778705Siedowse struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf; 11878705Siedowse struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa; 11974462Salfred struct sockaddr_storage ss; 12074462Salfred struct netconfig *nconf; 121296994Sasomers char *caller_uaddr = NULL; 122301636Sngie#ifdef ND_DEBUG 123296994Sasomers const char *hint_uaddr = NULL; 124301636Sngie#endif 12574462Salfred char *ret = NULL; 126296994Sasomers int bestif_goodness; 12774462Salfred 12874462Salfred#ifdef ND_DEBUG 12974462Salfred if (debugging) 13074462Salfred fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 13178705Siedowse clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); 13274462Salfred#endif 13378705Siedowse caller_sa = caller->buf; 13478705Siedowse if ((nconf = rpcbind_get_conf(netid)) == NULL) 13578705Siedowse goto freeit; 13678705Siedowse if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL) 13778705Siedowse goto freeit; 13874462Salfred 13974462Salfred /* 14078705Siedowse * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its 14178705Siedowse * address family is different from that of the caller. 14274462Salfred */ 14378705Siedowse hint_sa = NULL; 14474462Salfred if (clnt_uaddr != NULL) { 145301636Sngie#ifdef ND_DEBUG 14678705Siedowse hint_uaddr = clnt_uaddr; 147301636Sngie#endif 14878705Siedowse if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL) 14978705Siedowse goto freeit; 15078705Siedowse hint_sa = hint_nbp->buf; 15174462Salfred } 15278705Siedowse if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) { 153301636Sngie#ifdef ND_DEBUG 15478705Siedowse hint_uaddr = caller_uaddr; 155301636Sngie#endif 15678705Siedowse hint_sa = caller->buf; 15778705Siedowse } 15874462Salfred 15978705Siedowse#ifdef ND_DEBUG 16078705Siedowse if (debugging) 16178705Siedowse fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr); 16278705Siedowse#endif 16378705Siedowse /* Local caller, just return the server address. */ 16478705Siedowse if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 || 16578705Siedowse strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') { 16678705Siedowse ret = strdup(serv_uaddr); 16778705Siedowse goto freeit; 16876037Siedowse } 16974462Salfred 17078705Siedowse if (getifaddrs(&ifp) < 0) 17178705Siedowse goto freeit; 17278705Siedowse 17374462Salfred /* 174296994Sasomers * Loop through all interface addresses. We are listening to an address 175296994Sasomers * if any of the following are true: 176296994Sasomers * a) It's a loopback address 177296994Sasomers * b) It was specified with the -h command line option 178296994Sasomers * c) There were no -h command line options. 179296994Sasomers * 180296994Sasomers * Among addresses on which we are listening, choose in order of 181296994Sasomers * preference an address that is: 182296994Sasomers * 183296994Sasomers * a) Equal to the hint 184296994Sasomers * b) A link local address with the same scope ID as the client's 185296994Sasomers * address, if the client's address is also link local 186296994Sasomers * c) An address on the same subnet as the client's address 187296994Sasomers * d) A non-localhost, non-p2p address 188296994Sasomers * e) Any usable address 18974462Salfred */ 19078705Siedowse bestif = NULL; 191296994Sasomers bestif_goodness = 0; 19274462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 19378705Siedowse ifsa = ifap->ifa_addr; 19478705Siedowse ifmasksa = ifap->ifa_netmask; 19578705Siedowse 196296994Sasomers /* Skip addresses where we don't listen */ 19778705Siedowse if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || 19874462Salfred !(ifap->ifa_flags & IFF_UP)) 19974462Salfred continue; 20074462Salfred 201203710Simp if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) 202203710Simp continue; 203203710Simp 204296994Sasomers if ((hint_sa->sa_family == AF_INET) && 205296994Sasomers ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr == 206296994Sasomers ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) { 207296994Sasomers const int goodness = 4; 208296994Sasomers 209296994Sasomers bestif_goodness = goodness; 210296994Sasomers bestif = ifap; 211296994Sasomers goto found; 212296994Sasomers } 21374462Salfred#ifdef INET6 214296994Sasomers if ((hint_sa->sa_family == AF_INET6) && 215296994Sasomers (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr, 216296994Sasomers &((struct sockaddr_in6*)ifsa)->sin6_addr, 217296994Sasomers sizeof(struct in6_addr))) && 218296994Sasomers (((struct sockaddr_in6*)hint_sa)->sin6_scope_id == 219296994Sasomers (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) { 220296994Sasomers const int goodness = 4; 221296994Sasomers 222296994Sasomers bestif_goodness = goodness; 223296994Sasomers bestif = ifap; 224296994Sasomers goto found; 225296994Sasomers } 226296994Sasomers if (hint_sa->sa_family == AF_INET6) { 22774462Salfred /* 22878705Siedowse * For v6 link local addresses, if the caller is on 22978705Siedowse * a link-local address then use the scope id to see 23078705Siedowse * which one. 23174462Salfred */ 23278705Siedowse if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && 23378705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && 23478705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { 23578705Siedowse if (SA2SIN6(ifsa)->sin6_scope_id == 23678705Siedowse SA2SIN6(caller_sa)->sin6_scope_id) { 237296994Sasomers const int goodness = 3; 238296994Sasomers 239296994Sasomers if (bestif_goodness < goodness) { 240296994Sasomers bestif = ifap; 241296994Sasomers bestif_goodness = goodness; 242296994Sasomers } 24378705Siedowse } 244296994Sasomers } 245296994Sasomers } 246296994Sasomers#endif /* INET6 */ 247296994Sasomers if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) { 248296994Sasomers const int goodness = 2; 249296994Sasomers 250296994Sasomers if (bestif_goodness < goodness) { 25178705Siedowse bestif = ifap; 252296994Sasomers bestif_goodness = goodness; 25374462Salfred } 25474462Salfred } 255296994Sasomers if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 256296994Sasomers const int goodness = 1; 25778705Siedowse 258296994Sasomers if (bestif_goodness < goodness) { 259296994Sasomers bestif = ifap; 260296994Sasomers bestif_goodness = goodness; 261296994Sasomers } 262296994Sasomers } 263296994Sasomers if (bestif == NULL) 26474462Salfred bestif = ifap; 26574462Salfred } 26678705Siedowse if (bestif == NULL) 26778705Siedowse goto freeit; 26878705Siedowse 26974462Salfredfound: 27078705Siedowse /* 271218909Sbrucec * Construct the new address using the address from 27278705Siedowse * `bestif', and the port number from `serv_uaddr'. 27378705Siedowse */ 27478705Siedowse serv_nbp = uaddr2taddr(nconf, serv_uaddr); 27578705Siedowse if (serv_nbp == NULL) 27678705Siedowse goto freeit; 27778705Siedowse serv_sa = serv_nbp->buf; 27878705Siedowse 27978705Siedowse memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len); 28078705Siedowse switch (ss.ss_family) { 28176037Siedowse case AF_INET: 28278705Siedowse SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port; 28378705Siedowse break; 28476037Siedowse#ifdef INET6 28576037Siedowse case AF_INET6: 28678705Siedowse SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port; 28776037Siedowse break; 28876037Siedowse#endif 28976037Siedowse } 29078705Siedowse tbuf.len = ss.ss_len; 29178705Siedowse tbuf.maxlen = sizeof(ss); 29278705Siedowse tbuf.buf = &ss; 29378705Siedowse ret = taddr2uaddr(nconf, &tbuf); 29478705Siedowse 29574462Salfredfreeit: 296301646Sngie free(caller_uaddr); 29778705Siedowse if (hint_nbp != NULL) { 29878705Siedowse free(hint_nbp->buf); 29978705Siedowse free(hint_nbp); 30078705Siedowse } 30178705Siedowse if (serv_nbp != NULL) { 30278705Siedowse free(serv_nbp->buf); 30378705Siedowse free(serv_nbp); 30478705Siedowse } 30578705Siedowse if (ifp != NULL) 30678705Siedowse freeifaddrs(ifp); 30774462Salfred 30874462Salfred#ifdef ND_DEBUG 30974462Salfred if (debugging) 31074462Salfred fprintf(stderr, "addrmerge: returning %s\n", ret); 31174462Salfred#endif 31274462Salfred return ret; 31374462Salfred} 31474462Salfred 31574462Salfredvoid 316224001Sdelphijnetwork_init(void) 31774462Salfred{ 31874462Salfred#ifdef INET6 31974462Salfred struct ifaddrs *ifap, *ifp; 32074462Salfred struct ipv6_mreq mreq6; 321104592Salfred unsigned int ifindex; 322104592Salfred int s; 32374462Salfred#endif 32474462Salfred int ecode; 32574462Salfred struct addrinfo hints, *res; 32674462Salfred 32774462Salfred memset(&hints, 0, sizeof hints); 32874462Salfred hints.ai_family = AF_INET; 32974462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 33074462Salfred if (debugging) 33174462Salfred fprintf(stderr, "can't get local ip4 address: %s\n", 33274462Salfred gai_strerror(ecode)); 33374462Salfred } else { 33474462Salfred local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 33574462Salfred if (local_in4 == NULL) { 33674462Salfred if (debugging) 33774462Salfred fprintf(stderr, "can't alloc local ip4 addr\n"); 338301636Sngie exit(1); 33974462Salfred } 34074462Salfred memcpy(local_in4, res->ai_addr, sizeof *local_in4); 341301636Sngie freeaddrinfo(res); 34274462Salfred } 34374462Salfred 34474462Salfred#ifdef INET6 34574462Salfred hints.ai_family = AF_INET6; 34674462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 34774462Salfred if (debugging) 34874462Salfred fprintf(stderr, "can't get local ip6 address: %s\n", 34974462Salfred gai_strerror(ecode)); 35074462Salfred } else { 35174462Salfred local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 35274462Salfred if (local_in6 == NULL) { 35374462Salfred if (debugging) 35474462Salfred fprintf(stderr, "can't alloc local ip6 addr\n"); 355301636Sngie exit(1); 35674462Salfred } 35774462Salfred memcpy(local_in6, res->ai_addr, sizeof *local_in6); 358301636Sngie freeaddrinfo(res); 35974462Salfred } 36074462Salfred 36174462Salfred /* 36274462Salfred * Now join the RPC ipv6 multicast group on all interfaces. 36374462Salfred */ 36474462Salfred if (getifaddrs(&ifp) < 0) 36574462Salfred return; 36674462Salfred 36774462Salfred mreq6.ipv6mr_interface = 0; 36874462Salfred inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 36974462Salfred 37074462Salfred s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 371301636Sngie if (s == -1) { 372301636Sngie if (debugging) 373301636Sngie fprintf(stderr, "couldn't create ip6 socket"); 374301636Sngie goto done_inet6; 375301636Sngie } 37674462Salfred 37774462Salfred /* 37879720Siedowse * Loop through all interfaces. For each IPv6 multicast-capable 37979720Siedowse * interface, join the RPC multicast group on that interface. 38074462Salfred */ 38174462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 38274462Salfred if (ifap->ifa_addr->sa_family != AF_INET6 || 38374462Salfred !(ifap->ifa_flags & IFF_MULTICAST)) 38474462Salfred continue; 38574462Salfred ifindex = if_nametoindex(ifap->ifa_name); 38674462Salfred if (ifindex == mreq6.ipv6mr_interface) 38774462Salfred /* 38874462Salfred * Already did this one. 38974462Salfred */ 39074462Salfred continue; 39174462Salfred mreq6.ipv6mr_interface = ifindex; 39274462Salfred if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 39374462Salfred sizeof mreq6) < 0) 39474462Salfred if (debugging) 39574462Salfred perror("setsockopt v6 multicast"); 39674462Salfred } 397301636Sngiedone_inet6: 398301636Sngie freeifaddrs(ifp); 39974462Salfred#endif 40074462Salfred 40174462Salfred /* close(s); */ 40274462Salfred} 40374462Salfred 40474462Salfredstruct sockaddr * 40574462Salfredlocal_sa(int af) 40674462Salfred{ 40774462Salfred switch (af) { 40874462Salfred case AF_INET: 40974462Salfred return (struct sockaddr *)local_in4; 41074462Salfred#ifdef INET6 41174462Salfred case AF_INET6: 41274462Salfred return (struct sockaddr *)local_in6; 41374462Salfred#endif 41474462Salfred default: 41574462Salfred return NULL; 41674462Salfred } 41774462Salfred} 418