util.c revision 293229
174462Salfred/* 274462Salfred * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ 374462Salfred * $FreeBSD: head/usr.sbin/rpcbind/util.c 293229 2016-01-06 00:00:11Z asomers $ 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 59293229Sasomersstatic 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 67293229Sasomersbitmaskcmp(struct sockaddr *dst, struct sockaddr *src, struct sockaddr *mask) 6874462Salfred{ 6979720Siedowse int i; 70293229Sasomers u_int8_t *p1, *p2, *netmask; 71293229Sasomers int bytelen; 7274462Salfred 73293229Sasomers if (dst->sa_family != src->sa_family || 74293229Sasomers dst->sa_family != mask->sa_family) 75293229Sasomers return (1); 76293229Sasomers 77293229Sasomers switch (dst->sa_family) { 78293229Sasomers case AF_INET: 79293229Sasomers p1 = (uint8_t*) &SA2SINADDR(dst); 80293229Sasomers p2 = (uint8_t*) &SA2SINADDR(src); 81293229Sasomers netmask = (uint8_t*) &SA2SINADDR(mask); 82293229Sasomers bytelen = sizeof(struct in_addr); 83293229Sasomers break; 84293229Sasomers#ifdef INET6 85293229Sasomers case AF_INET6: 86293229Sasomers p1 = (uint8_t*) &SA2SIN6ADDR(dst); 87293229Sasomers p2 = (uint8_t*) &SA2SIN6ADDR(src); 88293229Sasomers netmask = (uint8_t*) &SA2SIN6ADDR(mask); 89293229Sasomers bytelen = sizeof(struct in6_addr); 90293229Sasomers break; 91293229Sasomers#endif 92293229Sasomers default: 93293229Sasomers return (1); 94293229Sasomers } 95293229Sasomers 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 * 113293229Sasomersaddrmerge(struct netbuf *caller, const char *serv_uaddr, const char *clnt_uaddr, 114293229Sasomers 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; 121293229Sasomers char *caller_uaddr = NULL; 122293229Sasomers const char *hint_uaddr = NULL; 12374462Salfred char *ret = NULL; 124293229Sasomers int bestif_goodness; 12574462Salfred 12674462Salfred#ifdef ND_DEBUG 12774462Salfred if (debugging) 12874462Salfred fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 12978705Siedowse clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); 13074462Salfred#endif 13178705Siedowse caller_sa = caller->buf; 13278705Siedowse if ((nconf = rpcbind_get_conf(netid)) == NULL) 13378705Siedowse goto freeit; 13478705Siedowse if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL) 13578705Siedowse goto freeit; 13674462Salfred 13774462Salfred /* 13878705Siedowse * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its 13978705Siedowse * address family is different from that of the caller. 14074462Salfred */ 14178705Siedowse hint_sa = NULL; 14274462Salfred if (clnt_uaddr != NULL) { 14378705Siedowse hint_uaddr = clnt_uaddr; 14478705Siedowse if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL) 14578705Siedowse goto freeit; 14678705Siedowse hint_sa = hint_nbp->buf; 14774462Salfred } 14878705Siedowse if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) { 14978705Siedowse hint_uaddr = caller_uaddr; 15078705Siedowse hint_sa = caller->buf; 15178705Siedowse } 15274462Salfred 15378705Siedowse#ifdef ND_DEBUG 15478705Siedowse if (debugging) 15578705Siedowse fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr); 15678705Siedowse#endif 15778705Siedowse /* Local caller, just return the server address. */ 15878705Siedowse if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 || 15978705Siedowse strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') { 16078705Siedowse ret = strdup(serv_uaddr); 16178705Siedowse goto freeit; 16276037Siedowse } 16374462Salfred 16478705Siedowse if (getifaddrs(&ifp) < 0) 16578705Siedowse goto freeit; 16678705Siedowse 16774462Salfred /* 168293229Sasomers * Loop through all interface addresses. We are listening to an address 169293229Sasomers * if any of the following are true: 170293229Sasomers * a) It's a loopback address 171293229Sasomers * b) It was specified with the -h command line option 172293229Sasomers * c) There were no -h command line options. 173293229Sasomers * 174293229Sasomers * Among addresses on which we are listening, choose in order of 175293229Sasomers * preference an address that is: 176293229Sasomers * 177293229Sasomers * a) Equal to the hint 178293229Sasomers * b) A link local address with the same scope ID as the client's 179293229Sasomers * address, if the client's address is also link local 180293229Sasomers * c) An address on the same subnet as the client's address 181293229Sasomers * d) A non-localhost, non-p2p address 182293229Sasomers * e) Any usable address 18374462Salfred */ 18478705Siedowse bestif = NULL; 185293229Sasomers bestif_goodness = 0; 18674462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 18778705Siedowse ifsa = ifap->ifa_addr; 18878705Siedowse ifmasksa = ifap->ifa_netmask; 18978705Siedowse 190293229Sasomers /* Skip addresses where we don't listen */ 19178705Siedowse if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || 19274462Salfred !(ifap->ifa_flags & IFF_UP)) 19374462Salfred continue; 19474462Salfred 195203710Simp if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) 196203710Simp continue; 197203710Simp 198293229Sasomers if ((hint_sa->sa_family == AF_INET) && 199293229Sasomers ((((struct sockaddr_in*)hint_sa)->sin_addr.s_addr == 200293229Sasomers ((struct sockaddr_in*)ifsa)->sin_addr.s_addr))) { 201293229Sasomers const int goodness = 4; 202293229Sasomers 203293229Sasomers bestif_goodness = goodness; 204293229Sasomers bestif = ifap; 205293229Sasomers goto found; 206293229Sasomers } 20774462Salfred#ifdef INET6 208293229Sasomers if ((hint_sa->sa_family == AF_INET6) && 209293229Sasomers (0 == memcmp(&((struct sockaddr_in6*)hint_sa)->sin6_addr, 210293229Sasomers &((struct sockaddr_in6*)ifsa)->sin6_addr, 211293229Sasomers sizeof(struct in6_addr))) && 212293229Sasomers (((struct sockaddr_in6*)hint_sa)->sin6_scope_id == 213293229Sasomers (((struct sockaddr_in6*)ifsa)->sin6_scope_id))) { 214293229Sasomers const int goodness = 4; 215293229Sasomers 216293229Sasomers bestif_goodness = goodness; 217293229Sasomers bestif = ifap; 218293229Sasomers goto found; 219293229Sasomers } 220293229Sasomers if (hint_sa->sa_family == AF_INET6) { 22174462Salfred /* 22278705Siedowse * For v6 link local addresses, if the caller is on 22378705Siedowse * a link-local address then use the scope id to see 22478705Siedowse * which one. 22574462Salfred */ 22678705Siedowse if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && 22778705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && 22878705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { 22978705Siedowse if (SA2SIN6(ifsa)->sin6_scope_id == 23078705Siedowse SA2SIN6(caller_sa)->sin6_scope_id) { 231293229Sasomers const int goodness = 3; 232293229Sasomers 233293229Sasomers if (bestif_goodness < goodness) { 234293229Sasomers bestif = ifap; 235293229Sasomers bestif_goodness = goodness; 236293229Sasomers } 23778705Siedowse } 238293229Sasomers } 239293229Sasomers } 240293229Sasomers#endif /* INET6 */ 241293229Sasomers if (0 == bitmaskcmp(hint_sa, ifsa, ifmasksa)) { 242293229Sasomers const int goodness = 2; 243293229Sasomers 244293229Sasomers if (bestif_goodness < goodness) { 24578705Siedowse bestif = ifap; 246293229Sasomers bestif_goodness = goodness; 24774462Salfred } 24874462Salfred } 249293229Sasomers if (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))) { 250293229Sasomers const int goodness = 1; 25178705Siedowse 252293229Sasomers if (bestif_goodness < goodness) { 253293229Sasomers bestif = ifap; 254293229Sasomers bestif_goodness = goodness; 255293229Sasomers } 256293229Sasomers } 257293229Sasomers if (bestif == NULL) 25874462Salfred bestif = ifap; 25974462Salfred } 26078705Siedowse if (bestif == NULL) 26178705Siedowse goto freeit; 26278705Siedowse 26374462Salfredfound: 26478705Siedowse /* 265218909Sbrucec * Construct the new address using the address from 26678705Siedowse * `bestif', and the port number from `serv_uaddr'. 26778705Siedowse */ 26878705Siedowse serv_nbp = uaddr2taddr(nconf, serv_uaddr); 26978705Siedowse if (serv_nbp == NULL) 27078705Siedowse goto freeit; 27178705Siedowse serv_sa = serv_nbp->buf; 27278705Siedowse 27378705Siedowse memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len); 27478705Siedowse switch (ss.ss_family) { 27576037Siedowse case AF_INET: 27678705Siedowse SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port; 27778705Siedowse break; 27876037Siedowse#ifdef INET6 27976037Siedowse case AF_INET6: 28078705Siedowse SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port; 28176037Siedowse break; 28276037Siedowse#endif 28376037Siedowse } 28478705Siedowse tbuf.len = ss.ss_len; 28578705Siedowse tbuf.maxlen = sizeof(ss); 28678705Siedowse tbuf.buf = &ss; 28778705Siedowse ret = taddr2uaddr(nconf, &tbuf); 28878705Siedowse 28974462Salfredfreeit: 29078705Siedowse if (caller_uaddr != NULL) 29178705Siedowse free(caller_uaddr); 29278705Siedowse if (hint_nbp != NULL) { 29378705Siedowse free(hint_nbp->buf); 29478705Siedowse free(hint_nbp); 29578705Siedowse } 29678705Siedowse if (serv_nbp != NULL) { 29778705Siedowse free(serv_nbp->buf); 29878705Siedowse free(serv_nbp); 29978705Siedowse } 30078705Siedowse if (ifp != NULL) 30178705Siedowse freeifaddrs(ifp); 30274462Salfred 30374462Salfred#ifdef ND_DEBUG 30474462Salfred if (debugging) 30574462Salfred fprintf(stderr, "addrmerge: returning %s\n", ret); 30674462Salfred#endif 30774462Salfred return ret; 30874462Salfred} 30974462Salfred 31074462Salfredvoid 311224001Sdelphijnetwork_init(void) 31274462Salfred{ 31374462Salfred#ifdef INET6 31474462Salfred struct ifaddrs *ifap, *ifp; 31574462Salfred struct ipv6_mreq mreq6; 316104592Salfred unsigned int ifindex; 317104592Salfred int s; 31874462Salfred#endif 31974462Salfred int ecode; 32074462Salfred struct addrinfo hints, *res; 32174462Salfred 32274462Salfred memset(&hints, 0, sizeof hints); 32374462Salfred hints.ai_family = AF_INET; 32474462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 32574462Salfred if (debugging) 32674462Salfred fprintf(stderr, "can't get local ip4 address: %s\n", 32774462Salfred gai_strerror(ecode)); 32874462Salfred } else { 32974462Salfred local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 33074462Salfred if (local_in4 == NULL) { 33174462Salfred if (debugging) 33274462Salfred fprintf(stderr, "can't alloc local ip4 addr\n"); 33374462Salfred } 33474462Salfred memcpy(local_in4, res->ai_addr, sizeof *local_in4); 33574462Salfred } 33674462Salfred 33774462Salfred#ifdef INET6 33874462Salfred hints.ai_family = AF_INET6; 33974462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 34074462Salfred if (debugging) 34174462Salfred fprintf(stderr, "can't get local ip6 address: %s\n", 34274462Salfred gai_strerror(ecode)); 34374462Salfred } else { 34474462Salfred local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 34574462Salfred if (local_in6 == NULL) { 34674462Salfred if (debugging) 34774462Salfred fprintf(stderr, "can't alloc local ip6 addr\n"); 34874462Salfred } 34974462Salfred memcpy(local_in6, res->ai_addr, sizeof *local_in6); 35074462Salfred } 35174462Salfred 35274462Salfred /* 35374462Salfred * Now join the RPC ipv6 multicast group on all interfaces. 35474462Salfred */ 35574462Salfred if (getifaddrs(&ifp) < 0) 35674462Salfred return; 35774462Salfred 35874462Salfred mreq6.ipv6mr_interface = 0; 35974462Salfred inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 36074462Salfred 36174462Salfred s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 36274462Salfred 36374462Salfred /* 36479720Siedowse * Loop through all interfaces. For each IPv6 multicast-capable 36579720Siedowse * interface, join the RPC multicast group on that interface. 36674462Salfred */ 36774462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 36874462Salfred if (ifap->ifa_addr->sa_family != AF_INET6 || 36974462Salfred !(ifap->ifa_flags & IFF_MULTICAST)) 37074462Salfred continue; 37174462Salfred ifindex = if_nametoindex(ifap->ifa_name); 37274462Salfred if (ifindex == mreq6.ipv6mr_interface) 37374462Salfred /* 37474462Salfred * Already did this one. 37574462Salfred */ 37674462Salfred continue; 37774462Salfred mreq6.ipv6mr_interface = ifindex; 37874462Salfred if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 37974462Salfred sizeof mreq6) < 0) 38074462Salfred if (debugging) 38174462Salfred perror("setsockopt v6 multicast"); 38274462Salfred } 38374462Salfred#endif 38474462Salfred 38574462Salfred /* close(s); */ 38674462Salfred} 38774462Salfred 38874462Salfredstruct sockaddr * 38974462Salfredlocal_sa(int af) 39074462Salfred{ 39174462Salfred switch (af) { 39274462Salfred case AF_INET: 39374462Salfred return (struct sockaddr *)local_in4; 39474462Salfred#ifdef INET6 39574462Salfred case AF_INET6: 39674462Salfred return (struct sockaddr *)local_in6; 39774462Salfred#endif 39874462Salfred default: 39974462Salfred return NULL; 40074462Salfred } 40174462Salfred} 402