/* * pmap_rmt.c * Client interface to pmap rpc service. * remote call and broadcast service * * Copyright (c) 2010, Oracle America, Inc. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are * met: * * * Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * * 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. * * Neither the name of the "Oracle America, Inc." 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 COPYRIGHT HOLDERS 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 * COPYRIGHT HOLDER 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 <unistd.h> #include <string.h> #include <libintl.h> #include <rpc/rpc.h> #include <rpc/pmap_prot.h> #include <rpc/pmap_clnt.h> #include <rpc/pmap_rmt.h> #include <sys/poll.h> #include <sys/socket.h> #include <stdio.h> #include <errno.h> #include <sys/param.h> #include <net/if.h> #include <ifaddrs.h> #include <sys/ioctl.h> #include <arpa/inet.h> #include <shlib-compat.h> #define MAX_BROADCAST_SIZE 1400 extern u_long _create_xid (void); static const struct timeval timeout = {3, 0}; /* * pmapper remote-call-service interface. * This routine is used to call the pmapper remote call service * which will look up a service program in the port maps, and then * remotely call that routine with the given parameters. This allows * programs to do a lookup and call in one step. */ enum clnt_stat pmap_rmtcall (struct sockaddr_in *addr, u_long prog, u_long vers, u_long proc, xdrproc_t xdrargs, caddr_t argsp, xdrproc_t xdrres, caddr_t resp, struct timeval tout, u_long *port_ptr) { int socket = -1; CLIENT *client; struct rmtcallargs a; struct rmtcallres r; enum clnt_stat stat; addr->sin_port = htons (PMAPPORT); client = clntudp_create (addr, PMAPPROG, PMAPVERS, timeout, &socket); if (client != (CLIENT *) NULL) { a.prog = prog; a.vers = vers; a.proc = proc; a.args_ptr = argsp; a.xdr_args = xdrargs; r.port_ptr = port_ptr; r.results_ptr = resp; r.xdr_results = xdrres; stat = CLNT_CALL (client, PMAPPROC_CALLIT, (xdrproc_t)xdr_rmtcall_args, (caddr_t)&a, (xdrproc_t)xdr_rmtcallres, (caddr_t)&r, tout); CLNT_DESTROY (client); } else { stat = RPC_FAILED; } /* (void)__close(socket); CLNT_DESTROY already closed it */ addr->sin_port = 0; return stat; } libc_hidden_nolink_sunrpc (pmap_rmtcall, GLIBC_2_0) /* * XDR remote call arguments * written for XDR_ENCODE direction only */ bool_t xdr_rmtcall_args (XDR *xdrs, struct rmtcallargs *cap) { u_int lenposition, argposition, position; if (xdr_u_long (xdrs, &(cap->prog)) && xdr_u_long (xdrs, &(cap->vers)) && xdr_u_long (xdrs, &(cap->proc))) { u_long dummy_arglen = 0; lenposition = XDR_GETPOS (xdrs); if (!xdr_u_long (xdrs, &dummy_arglen)) return FALSE; argposition = XDR_GETPOS (xdrs); if (!(*(cap->xdr_args)) (xdrs, cap->args_ptr)) return FALSE; position = XDR_GETPOS (xdrs); cap->arglen = (u_long) position - (u_long) argposition; XDR_SETPOS (xdrs, lenposition); if (!xdr_u_long (xdrs, &(cap->arglen))) return FALSE; XDR_SETPOS (xdrs, position); return TRUE; } return FALSE; } libc_hidden_nolink_sunrpc (xdr_rmtcall_args, GLIBC_2_0) /* * XDR remote call results * written for XDR_DECODE direction only */ bool_t xdr_rmtcallres (XDR *xdrs, struct rmtcallres *crp) { caddr_t port_ptr; port_ptr = (caddr_t) crp->port_ptr; if (xdr_reference (xdrs, &port_ptr, sizeof (u_long), (xdrproc_t) xdr_u_long) && xdr_u_long (xdrs, &crp->resultslen)) { crp->port_ptr = (u_long *) port_ptr; return (*(crp->xdr_results)) (xdrs, crp->results_ptr); } return FALSE; } libc_hidden_nolink_sunrpc (xdr_rmtcallres, GLIBC_2_0) /* * The following is kludged-up support for simple rpc broadcasts. * Someday a large, complicated system will replace these trivial * routines which only support udp/ip . */ static int getbroadcastnets (struct in_addr *addrs, int naddrs) { struct ifaddrs *ifa; if (getifaddrs (&ifa) != 0) { perror ("broadcast: getifaddrs"); return 0; } int i = 0; struct ifaddrs *run = ifa; while (run != NULL && i < naddrs) { if ((run->ifa_flags & IFF_BROADCAST) != 0 && (run->ifa_flags & IFF_UP) != 0 && run->ifa_addr != NULL && run->ifa_addr->sa_family == AF_INET) /* Copy the broadcast address. */ addrs[i++] = ((struct sockaddr_in *) run->ifa_broadaddr)->sin_addr; run = run->ifa_next; } freeifaddrs (ifa); return i; } enum clnt_stat clnt_broadcast (/* program number */ u_long prog, /* version number */ u_long vers, /* procedure number */ u_long proc, /* xdr routine for args */ xdrproc_t xargs, /* pointer to args */ caddr_t argsp, /* xdr routine for results */ xdrproc_t xresults, /* pointer to results */ caddr_t resultsp, /* call with each result obtained */ resultproc_t eachresult) { enum clnt_stat stat = RPC_FAILED; AUTH *unix_auth = authunix_create_default (); XDR xdr_stream; XDR *xdrs = &xdr_stream; struct timeval t; int outlen, inlen, nets; socklen_t fromlen; int sock; int on = 1; struct pollfd fd; int milliseconds; int i; bool_t done = FALSE; u_long xid; u_long port; struct in_addr addrs[20]; struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ struct rmtcallargs a; struct rmtcallres r; struct rpc_msg msg; char outbuf[MAX_BROADCAST_SIZE], inbuf[UDPMSGSIZE]; /* * initialization: create a socket, a broadcast address, and * preserialize the arguments into a send buffer. */ if ((sock = __socket (AF_INET, SOCK_DGRAM, IPPROTO_UDP)) < 0) { perror (_("Cannot create socket for broadcast rpc")); stat = RPC_CANTSEND; goto done_broad; } #ifdef SO_BROADCAST if (__setsockopt (sock, SOL_SOCKET, SO_BROADCAST, &on, sizeof (on)) < 0) { perror (_("Cannot set socket option SO_BROADCAST")); stat = RPC_CANTSEND; goto done_broad; } #endif /* def SO_BROADCAST */ fd.fd = sock; fd.events = POLLIN; nets = getbroadcastnets (addrs, sizeof (addrs) / sizeof (addrs[0])); memset ((char *) &baddr, 0, sizeof (baddr)); baddr.sin_family = AF_INET; baddr.sin_port = htons (PMAPPORT); baddr.sin_addr.s_addr = htonl (INADDR_ANY); /* baddr.sin_addr.S_un.S_addr = htonl(INADDR_ANY); */ msg.rm_xid = xid = _create_xid (); t.tv_usec = 0; msg.rm_direction = CALL; msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; msg.rm_call.cb_prog = PMAPPROG; msg.rm_call.cb_vers = PMAPVERS; msg.rm_call.cb_proc = PMAPPROC_CALLIT; msg.rm_call.cb_cred = unix_auth->ah_cred; msg.rm_call.cb_verf = unix_auth->ah_verf; a.prog = prog; a.vers = vers; a.proc = proc; a.xdr_args = xargs; a.args_ptr = argsp; r.port_ptr = &port; r.xdr_results = xresults; r.results_ptr = resultsp; xdrmem_create (xdrs, outbuf, MAX_BROADCAST_SIZE, XDR_ENCODE); if ((!xdr_callmsg (xdrs, &msg)) || (!xdr_rmtcall_args (xdrs, &a))) { stat = RPC_CANTENCODEARGS; goto done_broad; } outlen = (int) xdr_getpos (xdrs); xdr_destroy (xdrs); /* * Basic loop: broadcast a packet and wait a while for response(s). * The response timeout grows larger per iteration. */ for (t.tv_sec = 4; t.tv_sec <= 14; t.tv_sec += 2) { for (i = 0; i < nets; i++) { baddr.sin_addr = addrs[i]; if (__sendto (sock, outbuf, outlen, 0, (struct sockaddr *) &baddr, sizeof (struct sockaddr)) != outlen) { perror (_("Cannot send broadcast packet")); stat = RPC_CANTSEND; goto done_broad; } } if (eachresult == NULL) { stat = RPC_SUCCESS; goto done_broad; } recv_again: msg.acpted_rply.ar_verf = _null_auth; msg.acpted_rply.ar_results.where = (caddr_t) & r; msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_rmtcallres; milliseconds = t.tv_sec * 1000 + t.tv_usec / 1000; switch (__poll(&fd, 1, milliseconds)) { case 0: /* timed out */ stat = RPC_TIMEDOUT; continue; case -1: /* some kind of error */ if (errno == EINTR) goto recv_again; perror (_("Broadcast poll problem")); stat = RPC_CANTRECV; goto done_broad; } /* end of poll results switch */ try_again: fromlen = sizeof (struct sockaddr); inlen = __recvfrom (sock, inbuf, UDPMSGSIZE, 0, (struct sockaddr *) &raddr, &fromlen); if (inlen < 0) { if (errno == EINTR) goto try_again; perror (_("Cannot receive reply to broadcast")); stat = RPC_CANTRECV; goto done_broad; } if ((size_t) inlen < sizeof (u_long)) goto recv_again; /* * see if reply transaction id matches sent id. * If so, decode the results. */ xdrmem_create (xdrs, inbuf, (u_int) inlen, XDR_DECODE); if (xdr_replymsg (xdrs, &msg)) { if (((uint32_t) msg.rm_xid == (uint32_t) xid) && (msg.rm_reply.rp_stat == MSG_ACCEPTED) && (msg.acpted_rply.ar_stat == SUCCESS)) { raddr.sin_port = htons ((u_short) port); done = (*eachresult) (resultsp, &raddr); } /* otherwise, we just ignore the errors ... */ } else { #ifdef notdef /* some kind of deserialization problem ... */ if ((uint32_t) msg.rm_xid == (uint32_t) xid) fprintf (stderr, "Broadcast deserialization problem"); /* otherwise, just random garbage */ #endif } xdrs->x_op = XDR_FREE; msg.acpted_rply.ar_results.proc = (xdrproc_t)xdr_void; (void) xdr_replymsg (xdrs, &msg); (void) (*xresults) (xdrs, resultsp); xdr_destroy (xdrs); if (done) { stat = RPC_SUCCESS; goto done_broad; } else { goto recv_again; } } done_broad: (void) __close (sock); AUTH_DESTROY (unix_auth); return stat; } libc_hidden_nolink_sunrpc (clnt_broadcast, GLIBC_2_0)