Initial commit of rpcbind 0.1.4

1 files changed, 395 insertions, 0 deletions

diff --git a/src/util.c b/src/util.c
new file mode 100644
index 0000000..a3b61df
--- /dev/null
+++ b/src/util.c
@@ -0,0 +1,395 @@
+/*
+ * $NetBSD: util.c,v 1.4 2000/08/03 00:04:30 fvdl Exp $
+ * $FreeBSD: src/usr.sbin/rpcbind/util.c,v 1.5 2002/10/07 02:56:59 alfred Exp $
+ */
+
+/*-
+ * Copyright (c) 2000 The NetBSD Foundation, Inc.
+ * All rights reserved.
+ *
+ * This code is derived from software contributed to The NetBSD Foundation
+ * by Frank van der Linden.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *	This product includes software developed by the NetBSD
+ *	Foundation, Inc. and its contributors.
+ * 4. Neither the name of The NetBSD Foundation nor the names of its
+ *    contributors may be used to endorse or promote products derived
+ *    from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE NETBSD FOUNDATION, INC. AND CONTRIBUTORS
+ * ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
+ * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
+ * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE FOUNDATION OR CONTRIBUTORS
+ * BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
+ * CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
+ * SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
+ * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
+ * CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
+ * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
+ * POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/queue.h>
+#include <net/if.h>
+#include <netinet/in.h>
+#include <ifaddrs.h>
+#include <sys/poll.h>
+#include <rpc/rpc.h>
+#include <errno.h>
+#include <stdlib.h>
+#include <string.h>
+#include <unistd.h>
+#include <netdb.h>
+#include <netconfig.h>
+#include <stdio.h>
+#include <arpa/inet.h>
+
+#include "rpcbind.h"
+
+#define	SA2SIN(sa)	((struct sockaddr_in *)(sa))
+#define	SA2SINADDR(sa)	(SA2SIN(sa)->sin_addr)
+#ifdef INET6
+#define	SA2SIN6(sa)	((struct sockaddr_in6 *)(sa))
+#define	SA2SIN6ADDR(sa)	(SA2SIN6(sa)->sin6_addr)
+#endif
+
+static struct sockaddr_in *local_in4;
+#ifdef INET6
+static struct sockaddr_in6 *local_in6;
+#endif
+
+static int bitmaskcmp __P((void *, void *, void *, int));
+#ifdef INET6
+static void in6_fillscopeid __P((struct sockaddr_in6 *));
+#endif
+
+/*
+ * For all bits set in "mask", compare the corresponding bits in
+ * "dst" and "src", and see if they match. Returns 0 if the addresses
+ * match.
+ */
+static int
+bitmaskcmp(void *dst, void *src, void *mask, int bytelen)
+{
+	int i;
+	u_int8_t *p1 = dst, *p2 = src, *netmask = mask;
+
+	for (i = 0; i < bytelen; i++)
+		if ((p1[i] & netmask[i]) != (p2[i] & netmask[i]))
+			return (1);
+	return (0);
+}
+
+/*
+ * Similar to code in ifconfig.c. Fill in the scope ID for link-local
+ * addresses returned by getifaddrs().
+ */
+#ifdef INET6
+static void
+in6_fillscopeid(struct sockaddr_in6 *sin6)
+{
+	u_int16_t ifindex;
+
+        if (IN6_IS_ADDR_LINKLOCAL(&sin6->sin6_addr)) {
+		ifindex = ntohs(*(u_int16_t *)&sin6->sin6_addr.s6_addr[2]);
+		if (sin6->sin6_scope_id == 0 && ifindex != 0) {
+			sin6->sin6_scope_id = ifindex;
+			*(u_int16_t *)&sin6->sin6_addr.s6_addr[2] = 0;
+		}
+	}
+}
+#endif
+
+/*
+ * Find a server address that can be used by `caller' to contact
+ * the local service specified by `serv_uaddr'. If `clnt_uaddr' is
+ * non-NULL, it is used instead of `caller' as a hint suggesting
+ * the best address (e.g. the `r_addr' field of an rpc, which
+ * contains the rpcbind server address that the caller used).
+ *
+ * Returns the best server address as a malloc'd "universal address"
+ * string which should be freed by the caller. On error, returns NULL.
+ */
+char *
+addrmerge(struct netbuf *caller, char *serv_uaddr, char *clnt_uaddr,
+	  char *netid)
+{
+	struct ifaddrs *ifap, *ifp = NULL, *bestif;
+	struct netbuf *serv_nbp = NULL, *hint_nbp = NULL, tbuf;
+	struct sockaddr *caller_sa, *hint_sa, *ifsa, *ifmasksa, *serv_sa;
+	struct sockaddr_storage ss;
+	struct netconfig *nconf;
+	char *caller_uaddr = NULL, *hint_uaddr = NULL;
+	char *ret = NULL;
+	int size = 0;
+#ifdef ND_DEBUG
+	if (debugging)
+		fprintf(stderr, "addrmerge(caller, %s, %s, %s\n", serv_uaddr,
+		    clnt_uaddr == NULL ? "NULL" : clnt_uaddr, netid);
+#endif
+	caller_sa = caller->buf;
+	if ((nconf = rpcbind_get_conf(netid)) == NULL)
+		goto freeit;
+	if ((caller_uaddr = taddr2uaddr(nconf, caller)) == NULL)
+		goto freeit;
+
+	/*
+	 * Use `clnt_uaddr' as the hint if non-NULL, but ignore it if its
+	 * address family is different from that of the caller.
+	 */
+	hint_sa = NULL;
+	if (clnt_uaddr != NULL) {
+		hint_uaddr = clnt_uaddr;
+		if ((hint_nbp = uaddr2taddr(nconf, clnt_uaddr)) == NULL)
+			goto freeit;
+		hint_sa = hint_nbp->buf;
+	}
+	if (hint_sa == NULL || hint_sa->sa_family != caller_sa->sa_family) {
+		hint_uaddr = caller_uaddr;
+		hint_sa = caller->buf;
+	}
+
+#ifdef ND_DEBUG
+	if (debugging)
+		fprintf(stderr, "addrmerge: hint %s\n", hint_uaddr);
+#endif
+	/* Local caller, just return the server address. */
+	if (strncmp(caller_uaddr, "0.0.0.0.", 8) == 0 ||
+	    strncmp(caller_uaddr, "::.", 3) == 0 || caller_uaddr[0] == '/') {
+		ret = strdup(serv_uaddr);
+		goto freeit;
+	}
+
+	if (getifaddrs(&ifp) < 0)
+		goto freeit;
+
+	/*
+	 * Loop through all interfaces. For each interface, see if the
+	 * network portion of its address is equal to that of the client.
+	 * If so, we have found the interface that we want to use.
+	 */
+	bestif = NULL;
+	for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
+		ifsa = ifap->ifa_addr;
+		ifmasksa = ifap->ifa_netmask;
+
+		if (ifsa == NULL || ifsa->sa_family != hint_sa->sa_family ||
+		    !(ifap->ifa_flags & IFF_UP))
+			continue;
+
+		switch (hint_sa->sa_family) {
+		case AF_INET:
+			/*
+			 * If the hint address matches this interface
+			 * address/netmask, then we're done.
+			 */
+			if (!bitmaskcmp(&SA2SINADDR(ifsa),
+			    &SA2SINADDR(hint_sa), &SA2SINADDR(ifmasksa),
+			    sizeof(struct in_addr))) {
+				bestif = ifap;
+				goto found;
+			}
+			break;
+#ifdef INET6
+		case AF_INET6:
+			/*
+			 * For v6 link local addresses, if the caller is on
+			 * a link-local address then use the scope id to see
+			 * which one.
+			 */
+			in6_fillscopeid(SA2SIN6(ifsa));
+			if (IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(ifsa)) &&
+			    IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(caller_sa)) &&
+			    IN6_IS_ADDR_LINKLOCAL(&SA2SIN6ADDR(hint_sa))) {
+				if (SA2SIN6(ifsa)->sin6_scope_id ==
+				    SA2SIN6(caller_sa)->sin6_scope_id) {
+					bestif = ifap;
+					goto found;
+				}
+			} else if (!bitmaskcmp(&SA2SIN6ADDR(ifsa),
+			    &SA2SIN6ADDR(hint_sa), &SA2SIN6ADDR(ifmasksa),
+			    sizeof(struct in6_addr))) {
+				bestif = ifap;
+				goto found;
+			}
+			break;
+#endif
+		default:
+			continue;
+		}
+
+		/*
+		 * Remember the first possibly useful interface, preferring
+		 * "normal" to point-to-point and loopback ones.
+		 */
+		if (bestif == NULL ||
+		    (!(ifap->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT)) &&
+		    (bestif->ifa_flags & (IFF_LOOPBACK | IFF_POINTOPOINT))))
+			bestif = ifap;
+	}
+	if (bestif == NULL)
+		goto freeit;
+
+found:
+	/*
+	 * Construct the new address using the the address from
+	 * `bestif', and the port number from `serv_uaddr'.
+	 */
+	serv_nbp = uaddr2taddr(nconf, serv_uaddr);
+	if (serv_nbp == NULL)
+		goto freeit;
+	serv_sa = serv_nbp->buf;
+
+	switch(bestif->ifa_addr->sa_family){
+	case AF_INET:
+		size = sizeof(struct sockaddr_in);
+		break;
+#ifdef INET6
+		case AF_INET6:
+		size = sizeof(struct sockaddr_in6);
+	break;
+#endif
+	}
+	memcpy(&ss, bestif->ifa_addr, size);
+	
+	switch (ss.ss_family) {
+	case AF_INET:
+		SA2SIN(&ss)->sin_port = SA2SIN(serv_sa)->sin_port;
+		tbuf.len = sizeof(struct sockaddr_in);
+		break;
+#ifdef INET6
+	case AF_INET6:
+		SA2SIN6(&ss)->sin6_port = SA2SIN6(serv_sa)->sin6_port;
+		tbuf.len = sizeof(struct sockaddr_in6);
+		break;
+#endif
+	}
+	tbuf.maxlen = sizeof(ss);
+	tbuf.buf = &ss;
+	ret = taddr2uaddr(nconf, &tbuf);
+
+freeit:
+	if (caller_uaddr != NULL)
+		free(caller_uaddr);
+	if (hint_nbp != NULL) {
+		free(hint_nbp->buf);
+		free(hint_nbp);
+	}
+	if (serv_nbp != NULL) {
+		free(serv_nbp->buf);
+		free(serv_nbp);
+	}
+	if (ifp != NULL)
+		freeifaddrs(ifp);
+
+#ifdef ND_DEBUG
+	if (debugging)
+		fprintf(stderr, "addrmerge: returning %s\n", ret);
+#endif
+	return ret;
+}
+
+void
+network_init()
+{
+#ifdef INET6
+	struct ifaddrs *ifap, *ifp;
+	struct ipv6_mreq mreq6;
+	unsigned int ifindex;
+	int s;
+#endif
+	int ecode;
+	struct addrinfo hints, *res;
+
+	memset(&hints, 0, sizeof hints);
+	hints.ai_family = AF_INET;
+	if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
+		if (debugging)
+			fprintf(stderr, "can't get local ip4 address: %s\n",
+			    gai_strerror(ecode));
+	} else {
+		local_in4 = (struct sockaddr_in *)malloc(sizeof *local_in4);
+		if (local_in4 == NULL) {
+			if (debugging)
+				fprintf(stderr, "can't alloc local ip4 addr\n");
+		}
+		memcpy(local_in4, res->ai_addr, sizeof *local_in4);
+	}
+
+#ifdef INET6
+	hints.ai_family = AF_INET6;
+	if ((ecode = getaddrinfo(NULL, "sunrpc", &hints, &res))) {
+		if (debugging)
+			fprintf(stderr, "can't get local ip6 address: %s\n",
+			    gai_strerror(ecode));
+	} else {
+		local_in6 = (struct sockaddr_in6 *)malloc(sizeof *local_in6);
+		if (local_in6 == NULL) {
+			if (debugging)
+				fprintf(stderr, "can't alloc local ip6 addr\n");
+		}
+		memcpy(local_in6, res->ai_addr, sizeof *local_in6);
+	}
+
+	/*
+	 * Now join the RPC ipv6 multicast group on all interfaces.
+	 */
+	if (getifaddrs(&ifp) < 0)
+		return;
+
+	mreq6.ipv6mr_interface = 0;
+	inet_pton(AF_INET6, RPCB_MULTICAST_ADDR, &mreq6.ipv6mr_multiaddr);
+
+	s = socket(AF_INET6, SOCK_DGRAM, IPPROTO_UDP);
+
+	/*
+	 * Loop through all interfaces. For each IPv6 multicast-capable
+	 * interface, join the RPC multicast group on that interface.
+	 */
+	for (ifap = ifp; ifap != NULL; ifap = ifap->ifa_next) {
+		if (ifap->ifa_addr->sa_family != AF_INET6 ||
+		    !(ifap->ifa_flags & IFF_MULTICAST))
+			continue;
+		ifindex = if_nametoindex(ifap->ifa_name);
+		if (ifindex == mreq6.ipv6mr_interface)
+			/*
+			 * Already did this one.
+			 */
+			continue;
+		mreq6.ipv6mr_interface = ifindex;
+		if (setsockopt(s, IPPROTO_IPV6, IPV6_JOIN_GROUP, &mreq6,
+		    sizeof mreq6) < 0)
+			if (debugging)
+				perror("setsockopt v6 multicast");
+	}
+#endif
+
+	/* close(s); */
+}
+
+struct sockaddr *
+local_sa(int af)
+{
+	switch (af) {
+	case AF_INET:
+		return (struct sockaddr *)local_in4;
+#ifdef INET6
+	case AF_INET6:
+		return (struct sockaddr *)local_in6;
+#endif
+	default:
+		return NULL;
+	}
+}