174462Salfred/* 274462Salfred * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $ 374462Salfred * $FreeBSD: releng/10.3/usr.sbin/rpcbind/util.c 243187 2012-11-17 20:19:00Z hrs $ 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 59173412Skevlostatic int bitmaskcmp(void *, void *, void *, int); 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 6774462Salfredbitmaskcmp(void *dst, void *src, void *mask, int bytelen) 6874462Salfred{ 6979720Siedowse int i; 7074462Salfred u_int8_t *p1 = dst, *p2 = src, *netmask = mask; 7174462Salfred 7279720Siedowse for (i = 0; i < bytelen; i++) 7379720Siedowse if ((p1[i] & netmask[i]) != (p2[i] & netmask[i])) 7479720Siedowse return (1); 7579720Siedowse return (0); 7674462Salfred} 7774462Salfred 7874462Salfred/* 7978705Siedowse * Find a server address that can be used by `caller' to contact 8078705Siedowse * the local service specified by `serv_uaddr'. If `clnt_uaddr' is 8178705Siedowse * non-NULL, it is used instead of `caller' as a hint suggesting 8278705Siedowse * the best address (e.g. the `r_addr' field of an rpc, which 8378705Siedowse * contains the rpcbind server address that the caller used). 8478705Siedowse * 8578705Siedowse * Returns the best server address as a malloc'd "universal address" 8678705Siedowse * string which should be freed by the caller. On error, returns NULL. 8778705Siedowse */ 8874462Salfredchar * 8974462Salfredaddrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr, 9074462Salfred char *netid) 9174462Salfred{ 9278705Siedowse struct ifaddrs *ifap, *ifp = NULL, *bestif; 9378705Siedowse struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf; 9478705Siedowse struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa; 9574462Salfred struct sockaddr_storage ss; 9674462Salfred struct netconfig *nconf; 9778705Siedowse char *caller_uaddr = NULL, *hint_uaddr = NULL; 9874462Salfred char *ret = NULL; 9974462Salfred 10074462Salfred#ifdef ND_DEBUG 10174462Salfred if (debugging) 10274462Salfred fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr, 10378705Siedowse clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid); 10474462Salfred#endif 10578705Siedowse caller_sa = caller->buf; 10678705Siedowse if ((nconf = rpcbind_get_conf(netid)) == NULL) 10778705Siedowse goto freeit; 10878705Siedowse if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL) 10978705Siedowse goto freeit; 11074462Salfred 11174462Salfred /* 11278705Siedowse * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its 11378705Siedowse * address family is different from that of the caller. 11474462Salfred */ 11578705Siedowse hint_sa = NULL; 11674462Salfred if (clnt_uaddr != NULL) { 11778705Siedowse hint_uaddr = clnt_uaddr; 11878705Siedowse if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL) 11978705Siedowse goto freeit; 12078705Siedowse hint_sa = hint_nbp->buf; 12174462Salfred } 12278705Siedowse if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) { 12378705Siedowse hint_uaddr = caller_uaddr; 12478705Siedowse hint_sa = caller->buf; 12578705Siedowse } 12674462Salfred 12778705Siedowse#ifdef ND_DEBUG 12878705Siedowse if (debugging) 12978705Siedowse fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr); 13078705Siedowse#endif 13178705Siedowse /* Local caller, just return the server address. */ 13278705Siedowse if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 || 13378705Siedowse strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') { 13478705Siedowse ret = strdup(serv_uaddr); 13578705Siedowse goto freeit; 13676037Siedowse } 13774462Salfred 13878705Siedowse if (getifaddrs(&ifp) < 0) 13978705Siedowse goto freeit; 14078705Siedowse 14174462Salfred /* 142203710Simp * Loop through all interfaces. For each interface, see if it 143203710Simp * is either the loopback interface (which we always listen 144203710Simp * on) or is one of the addresses the program bound to (the 145203710Simp * wildcard by default, or a subset if -h is specified) and 146203710Simp * the network portion of its address is equal to that of the 147203710Simp * client. If so, we have found the interface that we want to 148203710Simp * use. 14974462Salfred */ 15078705Siedowse bestif = NULL; 15174462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 15278705Siedowse ifsa = ifap->ifa_addr; 15378705Siedowse ifmasksa = ifap->ifa_netmask; 15478705Siedowse 15578705Siedowse if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family || 15674462Salfred !(ifap->ifa_flags & IFF_UP)) 15774462Salfred continue; 15874462Salfred 159203710Simp if (!(ifap->ifa_flags & IFF_LOOPBACK) && !listen_addr(ifsa)) 160203710Simp continue; 161203710Simp 16278705Siedowse switch (hint_sa->sa_family) { 16374462Salfred case AF_INET: 16474462Salfred /* 16578705Siedowse * If the hint address matches this interface 16678705Siedowse * address/netmask, then we're done. 16774462Salfred */ 16878705Siedowse if (!bitmaskcmp(&SA2SINADDR(ifsa), 16978705Siedowse &SA2SINADDR(hint_sa), &SA2SINADDR(ifmasksa), 17078705Siedowse sizeof(struct in_addr))) { 17178705Siedowse bestif = ifap; 17274462Salfred goto found; 17374462Salfred } 17474462Salfred break; 17574462Salfred#ifdef INET6 17674462Salfred case AF_INET6: 17774462Salfred /* 17878705Siedowse * For v6 link local addresses, if the caller is on 17978705Siedowse * a link-local address then use the scope id to see 18078705Siedowse * which one. 18174462Salfred */ 18278705Siedowse if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) && 18378705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) && 18478705Siedowse IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) { 18578705Siedowse if (SA2SIN6(ifsa)->sin6_scope_id == 18678705Siedowse SA2SIN6(caller_sa)->sin6_scope_id) { 18778705Siedowse bestif = ifap; 18878705Siedowse goto found; 18978705Siedowse } 19078705Siedowse } else if (!bitmaskcmp(&SA2SIN6ADDR(ifsa), 19178705Siedowse &SA2SIN6ADDR(hint_sa), &SA2SIN6ADDR(ifmasksa), 19278705Siedowse sizeof(struct in6_addr))) { 19378705Siedowse bestif = ifap; 19474462Salfred goto found; 19574462Salfred } 19674462Salfred break; 19774462Salfred#endif 19874462Salfred default: 19974462Salfred continue; 20074462Salfred } 20178705Siedowse 20278705Siedowse /* 20378705Siedowse * Remember the first possibly useful interface, preferring 20478705Siedowse * "normal" to point-to-point and loopback ones. 20578705Siedowse */ 20678705Siedowse if (bestif == NULL || 20778705Siedowse (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) && 20878705Siedowse (bestif->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)))) 20974462Salfred bestif = ifap; 21074462Salfred } 21178705Siedowse if (bestif == NULL) 21278705Siedowse goto freeit; 21378705Siedowse 21474462Salfredfound: 21578705Siedowse /* 216218909Sbrucec * Construct the new address using the address from 21778705Siedowse * `bestif', and the port number from `serv_uaddr'. 21878705Siedowse */ 21978705Siedowse serv_nbp = uaddr2taddr(nconf, serv_uaddr); 22078705Siedowse if (serv_nbp == NULL) 22178705Siedowse goto freeit; 22278705Siedowse serv_sa = serv_nbp->buf; 22378705Siedowse 22478705Siedowse memcpy(&ss, bestif->ifa_addr, bestif->ifa_addr->sa_len); 22578705Siedowse switch (ss.ss_family) { 22676037Siedowse case AF_INET: 22778705Siedowse SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port; 22878705Siedowse break; 22976037Siedowse#ifdef INET6 23076037Siedowse case AF_INET6: 23178705Siedowse SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port; 23276037Siedowse break; 23376037Siedowse#endif 23476037Siedowse } 23578705Siedowse tbuf.len = ss.ss_len; 23678705Siedowse tbuf.maxlen = sizeof(ss); 23778705Siedowse tbuf.buf = &ss; 23878705Siedowse ret = taddr2uaddr(nconf, &tbuf); 23978705Siedowse 24074462Salfredfreeit: 24178705Siedowse if (caller_uaddr != NULL) 24278705Siedowse free(caller_uaddr); 24378705Siedowse if (hint_nbp != NULL) { 24478705Siedowse free(hint_nbp->buf); 24578705Siedowse free(hint_nbp); 24678705Siedowse } 24778705Siedowse if (serv_nbp != NULL) { 24878705Siedowse free(serv_nbp->buf); 24978705Siedowse free(serv_nbp); 25078705Siedowse } 25178705Siedowse if (ifp != NULL) 25278705Siedowse freeifaddrs(ifp); 25374462Salfred 25474462Salfred#ifdef ND_DEBUG 25574462Salfred if (debugging) 25674462Salfred fprintf(stderr, "addrmerge: returning %s\n", ret); 25774462Salfred#endif 25874462Salfred return ret; 25974462Salfred} 26074462Salfred 26174462Salfredvoid 262224001Sdelphijnetwork_init(void) 26374462Salfred{ 26474462Salfred#ifdef INET6 26574462Salfred struct ifaddrs *ifap, *ifp; 26674462Salfred struct ipv6_mreq mreq6; 267104592Salfred unsigned int ifindex; 268104592Salfred int s; 26974462Salfred#endif 27074462Salfred int ecode; 27174462Salfred struct addrinfo hints, *res; 27274462Salfred 27374462Salfred memset(&hints, 0, sizeof hints); 27474462Salfred hints.ai_family = AF_INET; 27574462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 27674462Salfred if (debugging) 27774462Salfred fprintf(stderr, "can't get local ip4 address: %s\n", 27874462Salfred gai_strerror(ecode)); 27974462Salfred } else { 28074462Salfred local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4); 28174462Salfred if (local_in4 == NULL) { 28274462Salfred if (debugging) 28374462Salfred fprintf(stderr, "can't alloc local ip4 addr\n"); 28474462Salfred } 28574462Salfred memcpy(local_in4, res->ai_addr, sizeof *local_in4); 28674462Salfred } 28774462Salfred 28874462Salfred#ifdef INET6 28974462Salfred hints.ai_family = AF_INET6; 29074462Salfred if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) { 29174462Salfred if (debugging) 29274462Salfred fprintf(stderr, "can't get local ip6 address: %s\n", 29374462Salfred gai_strerror(ecode)); 29474462Salfred } else { 29574462Salfred local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6); 29674462Salfred if (local_in6 == NULL) { 29774462Salfred if (debugging) 29874462Salfred fprintf(stderr, "can't alloc local ip6 addr\n"); 29974462Salfred } 30074462Salfred memcpy(local_in6, res->ai_addr, sizeof *local_in6); 30174462Salfred } 30274462Salfred 30374462Salfred /* 30474462Salfred * Now join the RPC ipv6 multicast group on all interfaces. 30574462Salfred */ 30674462Salfred if (getifaddrs(&ifp) < 0) 30774462Salfred return; 30874462Salfred 30974462Salfred mreq6.ipv6mr_interface = 0; 31074462Salfred inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr); 31174462Salfred 31274462Salfred s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP); 31374462Salfred 31474462Salfred /* 31579720Siedowse * Loop through all interfaces. For each IPv6 multicast-capable 31679720Siedowse * interface, join the RPC multicast group on that interface. 31774462Salfred */ 31874462Salfred for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) { 31974462Salfred if (ifap->ifa_addr->sa_family != AF_INET6 || 32074462Salfred !(ifap->ifa_flags & IFF_MULTICAST)) 32174462Salfred continue; 32274462Salfred ifindex = if_nametoindex(ifap->ifa_name); 32374462Salfred if (ifindex == mreq6.ipv6mr_interface) 32474462Salfred /* 32574462Salfred * Already did this one. 32674462Salfred */ 32774462Salfred continue; 32874462Salfred mreq6.ipv6mr_interface = ifindex; 32974462Salfred if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6, 33074462Salfred sizeof mreq6) < 0) 33174462Salfred if (debugging) 33274462Salfred perror("setsockopt v6 multicast"); 33374462Salfred } 33474462Salfred#endif 33574462Salfred 33674462Salfred /* close(s); */ 33774462Salfred} 33874462Salfred 33974462Salfredstruct sockaddr * 34074462Salfredlocal_sa(int af) 34174462Salfred{ 34274462Salfred switch (af) { 34374462Salfred case AF_INET: 34474462Salfred return (struct sockaddr *)local_in4; 34574462Salfred#ifdef INET6 34674462Salfred case AF_INET6: 34774462Salfred return (struct sockaddr *)local_in6; 34874462Salfred#endif 34974462Salfred default: 35074462Salfred return NULL; 35174462Salfred } 35274462Salfred} 353