/* * Copyright (c) 1997 Erez Zadok * Copyright (c) 1990 Jan-Simon Pendry * Copyright (c) 1990 Imperial College of Science, Technology & Medicine * Copyright (c) 1990 The Regents of the University of California. * All rights reserved. * * This code is derived from software contributed to Berkeley by * Jan-Simon Pendry at Imperial College, London. * * 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 University of * California, Berkeley and its contributors. * 4. Neither the name of the University 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 REGENTS 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 REGENTS 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. * * %W% (Berkeley) %G% * * $Id: tranputil.c,v 1.1.1.3 1997/09/26 16:06:09 christos Exp $ * * Socket specific utilities. * -Erez Zadok */ #ifdef HAVE_CONFIG_H # include #endif /* HAVE_CONFIG_H */ #include #include /* * find the IP address that can be used to connect to the local host */ void amu_get_myaddress(struct in_addr *iap) { struct sockaddr_in sin; memset((char *) &sin, 0, sizeof(sin)); get_myaddress(&sin); iap->s_addr = sin.sin_addr.s_addr; } /* * How to bind to reserved ports. */ int bind_resv_port(int so, u_short *pp) { struct sockaddr_in sin; int rc; u_short port; memset((voidp) &sin, 0, sizeof(sin)); sin.sin_family = AF_INET; port = IPPORT_RESERVED; do { --port; sin.sin_port = htons(port); rc = bind(so, (struct sockaddr *) &sin, sizeof(sin)); } while (rc < 0 && (int) port > IPPORT_RESERVED / 2); if (pp && rc == 0) *pp = port; return rc; } /* * close a descriptot, Sockets style */ int amu_close(int fd) { return close(fd); } /* * Create an rpc client attached to the mount daemon. */ CLIENT * get_mount_client(char *unused_host, struct sockaddr_in *sin, struct timeval *tv, int *sock, u_long mnt_version) { CLIENT *client; /* * First try a TCP socket */ if ((*sock = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) > 0) { /* * Bind to a privileged port */ if (bind_resv_port(*sock, (u_short *) 0) < 0) plog(XLOG_ERROR, "can't bind privileged port"); /* * Find mountd port to connect to. * Connect to mountd. * Create a tcp client. */ if ((sin->sin_port = htons(pmap_getport(sin, MOUNTPROG, mnt_version, IPPROTO_TCP))) != 0) { if (connect(*sock, (struct sockaddr *) sin, sizeof(*sin)) >= 0 && ((client = clnttcp_create(sin, MOUNTPROG, mnt_version, sock, 0, 0)) != NULL)) return client; } /* * Failed so close socket */ (void) close(*sock); } /* tcp socket opened */ /* TCP failed so try UDP */ if ((*sock = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { plog(XLOG_ERROR, "Can't create socket to connect to mountd: %m"); *sock = RPC_ANYSOCK; return NULL; } /* * Bind to a privileged port */ if (bind_resv_port(*sock, (u_short *) 0) < 0) plog(XLOG_ERROR, "can't bind privileged port"); /* * Zero out the port - make sure we recompute */ sin->sin_port = 0; /* * Make a UDP client */ if ((client = clntudp_create(sin, MOUNTPROG, mnt_version, *tv, sock)) == NULL) { (void) close(*sock); *sock = RPC_ANYSOCK; return NULL; } #ifdef DEBUG dlog("get_mount_client: Using udp, port %d", sin->sin_port); #endif /* DEBUG */ return client; } /* * find the address of the caller of an RPC procedure. */ struct sockaddr_in * amu_svc_getcaller(SVCXPRT *xprt) { return svc_getcaller(xprt); } /* * Bind NFS to a reserved port. */ static int bindnfs_port(int so, u_short *nfs_portp) { u_short port; int error = bind_resv_port(so, &port); if (error == 0) *nfs_portp = port; return error; } /* * Create the nfs service for amd */ int create_nfs_service(int *soNFSp, u_short *nfs_portp, SVCXPRT **nfs_xprtp, void (*dispatch_fxn)(struct svc_req *rqstp, SVCXPRT *transp)) { *soNFSp = socket(AF_INET, SOCK_DGRAM, 0); if (*soNFSp < 0 || bindnfs_port(*soNFSp, nfs_portp) < 0) { plog(XLOG_FATAL, "Can't create privileged nfs port"); return 1; } if ((*nfs_xprtp = svcudp_create(*soNFSp)) == NULL) { plog(XLOG_FATAL, "cannot create rpc/udp service"); return 2; } if (!svc_register(*nfs_xprtp, NFS_PROGRAM, NFS_VERSION, dispatch_fxn, 0)) { plog(XLOG_FATAL, "unable to register (NFS_PROGRAM, NFS_VERSION, 0)"); return 3; } return 0; /* all is well */ } /* * Create the amq service for amd (both TCP and UDP) */ int create_amq_service(int *udp_soAMQp, SVCXPRT **udp_amqpp, int *tcp_soAMQp, SVCXPRT **tcp_amqpp) { /* first create TCP service */ if (tcp_soAMQp) { *tcp_soAMQp = socket(AF_INET, SOCK_STREAM, 0); if (*tcp_soAMQp < 0) { plog(XLOG_FATAL, "cannot create tcp socket for amq service: %m"); return 1; } /* now create RPC service handle for amq */ if (tcp_amqpp && (*tcp_amqpp = svctcp_create(*tcp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) { plog(XLOG_FATAL, "cannot create tcp service for amq: soAMQp=%d", *tcp_soAMQp); return 2; } } /* next create UDP service */ if (udp_soAMQp) { *udp_soAMQp = socket(AF_INET, SOCK_DGRAM, 0); if (*udp_soAMQp < 0) { plog(XLOG_FATAL, "cannot create udp socket for amq service: %m"); return 3; } /* now create RPC service handle for amq */ if (udp_amqpp && (*udp_amqpp = svcudp_bufcreate(*udp_soAMQp, AMQ_SIZE, AMQ_SIZE)) == NULL) { plog(XLOG_FATAL, "cannot create udp service for amq: soAMQp=%d", *udp_soAMQp); return 4; } } return 0; /* all is well */ } /* * Ping the portmapper on a remote system by calling the nullproc */ static enum clnt_stat pmap_ping(struct sockaddr_in *address) { CLIENT *client; enum clnt_stat clnt_stat = RPC_TIMEDOUT; /* assume failure */ int socket = RPC_ANYSOCK; struct timeval timeout; timeout.tv_sec = 3; timeout.tv_usec = 0; address->sin_port = htons(PMAPPORT); client = clntudp_create(address, PMAPPROG, PMAPVERS, timeout, &socket); if (client != (CLIENT *) NULL) { clnt_stat = clnt_call(client, PMAPPROC_NULL, (XDRPROC_T_TYPE) xdr_void, 0, (XDRPROC_T_TYPE) xdr_void, 0, timeout); clnt_destroy(client); } close(socket); address->sin_port = 0; return clnt_stat; } /* * Find the best NFS version for a host and protocol. */ u_long get_nfs_version(char *host, struct sockaddr_in *sin, u_long nfs_version, const char *proto) { CLIENT *clnt; int again = 0; enum clnt_stat clnt_stat; struct timeval tv; int sock; /* * If not set or set wrong, then try from NFS_VERS_MAX on down. If * set, then try from nfs_version on down. */ if (nfs_version <= 0 || nfs_version > NFS_VERS_MAX) { nfs_version = NFS_VERS_MAX; again = 1; } tv.tv_sec = 3; /* retry every 3 seconds, but also timeout */ tv.tv_usec = 0; /* * First check if remote portmapper is up (verify if remote host is up). */ clnt_stat = pmap_ping(sin); if (clnt_stat == RPC_TIMEDOUT) { plog(XLOG_ERROR, "get_nfs_version: failed to contact portmapper on host \"%s\": %s", host, clnt_sperrno(clnt_stat)); return 0; } #ifdef HAVE_FS_NFS3 try_again: #endif /* HAVE_FS_NFS3 */ sock = RPC_ANYSOCK; if (STREQ(proto, "tcp")) clnt = clnttcp_create(sin, NFS_PROGRAM, nfs_version, &sock, 0, 0); else if (STREQ(proto, "udp")) clnt = clntudp_create(sin, NFS_PROGRAM, nfs_version, tv, &sock); else clnt = NULL; if (clnt == NULL) { plog(XLOG_INFO, "get_nfs_version NFS(%d,%s) failed for %s :%s", nfs_version, proto, host, clnt_spcreateerror("")); return 0; } /* Try a couple times to verify the CLIENT handle. */ tv.tv_sec = 6; clnt_stat = clnt_call(clnt, NFSPROC_NULL, (XDRPROC_T_TYPE) xdr_void, 0, (XDRPROC_T_TYPE) xdr_void, 0, tv); close(sock); clnt_destroy(clnt); if (clnt_stat != RPC_SUCCESS) { if (again) { #ifdef HAVE_FS_NFS3 if (nfs_version == NFS_VERSION3) { plog(XLOG_INFO, "get_nfs_version trying a lower version"); nfs_version = NFS_VERSION; again = 0; } goto try_again; #endif /* HAVE_FS_NFS3 */ } plog(XLOG_INFO, "get_nfs_version NFS(%d,%s) failed for %s", nfs_version, proto, host); return 0; } plog(XLOG_INFO, "get_nfs_version: returning (%d,%s) on host %s", nfs_version, proto, host); return nfs_version; } /* * AUTOFS FUNCTIONS FOR SOCKETS: */ #ifdef HAVE_FS_AUTOFS /* * Create the nfs service for amd */ int create_autofs_service(int *soAUTOFSp, u_short *autofs_portp, SVCXPRT **autofs_xprtp, void (*dispatch_fxn)(struct svc_req *rqstp, SVCXPRT *transp)) { /* NOT IMPLEMENTED! */ return -1; } #endif /* HAVE_FS_AUTOFS */