/* * Sun RPC is a product of Sun Microsystems, Inc. and is provided for * unrestricted use provided that this legend is included on all tape * media and as a part of the software program in whole or part. Users * may copy or modify Sun RPC without charge, but are not authorized * to license or distribute it to anyone else except as part of a product or * program developed by the user. * * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. * * Sun RPC is provided with no support and without any obligation on the * part of Sun Microsystems, Inc. to assist in its use, correction, * modification or enhancement. * * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC * OR ANY PART THEREOF. * * In no event will Sun Microsystems, Inc. be liable for any lost revenue * or profits or other special, indirect and consequential damages, even if * Sun has been advised of the possibility of such damages. * * Sun Microsystems, Inc. * 2550 Garcia Avenue * Mountain View, California 94043 */ #if defined(LIBC_SCCS) && !defined(lint) static char *rcsid = "$OpenBSD: pmap_rmt.c,v 1.16 1998/08/14 21:39:37 deraadt Exp $"; #endif /* LIBC_SCCS and not lint */ /* * pmap_rmt.c * Client interface to pmap rpc service. * remote call and broadcast service * * Copyright (C) 1984, Sun Microsystems, Inc. */ #include #include #include #include #include #include #include #include #include #include #include #include #include #define MAX_BROADCAST_SIZE 1400 static 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(addr, prog, vers, proc, xdrargs, argsp, xdrres, resp, tout, port_ptr) struct sockaddr_in *addr; u_long prog, vers, proc; xdrproc_t xdrargs, xdrres; caddr_t argsp, resp; struct timeval tout; u_long *port_ptr; { int sock = -1; register CLIENT *client; struct rmtcallargs a; struct rmtcallres r; enum clnt_stat stat; addr->sin_port = htons(PMAPPORT); client = clntudp_create(addr, PMAPPROG, PMAPVERS, timeout, &sock); 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, xdr_rmtcall_args, &a, xdr_rmtcallres, &r, tout); CLNT_DESTROY(client); } else { stat = RPC_FAILED; } if (sock != -1) (void)close(sock); addr->sin_port = 0; return (stat); } /* * XDR remote call arguments * written for XDR_ENCODE direction only */ bool_t xdr_rmtcall_args(xdrs, cap) register XDR *xdrs; register 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))) { lenposition = XDR_GETPOS(xdrs); if (! xdr_u_long(xdrs, &(cap->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); } /* * XDR remote call results * written for XDR_DECODE direction only */ bool_t xdr_rmtcallres(xdrs, crp) register XDR *xdrs; register struct rmtcallres *crp; { caddr_t port_ptr; port_ptr = (caddr_t)crp->port_ptr; if (xdr_reference(xdrs, &port_ptr, sizeof (u_long), 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); } /* * 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 newgetbroadcastnets(addrsp, sock) struct in_addr **addrsp; int sock; /* any valid socket will do */ { char *inbuf = NULL, *ninbuf; struct ifconf ifc; struct ifreq ifreq, *ifr; struct sockaddr_in *sin; char *cp, *cplim; int inbuflen = 256; struct in_addr *addrs; int i = 0; while (1) { ifc.ifc_len = inbuflen; ninbuf = realloc(inbuf, inbuflen); if (ninbuf == NULL) { if (inbuf) free(inbuf); return (0); } ifc.ifc_buf = inbuf = ninbuf; if (ioctl(sock, SIOCGIFCONF, (char *)&ifc) < 0) { perror("broadcast: ioctl (get interface configuration)"); free(inbuf); return (0); } if (ifc.ifc_len + sizeof(ifreq) < inbuflen) break; inbuflen *= 2; } addrs = (struct in_addr *)malloc((inbuflen / sizeof *sin) * sizeof sin); if (addrs == NULL) { *addrsp = NULL; free(inbuf); return (0); } #define max(a, b) (a > b ? a : b) #define size(p) max((p).sa_len, sizeof(p)) cplim = inbuf + ifc.ifc_len; /*skip over if's with big ifr_addr's */ for (cp = inbuf; cp < cplim; cp += sizeof (ifr->ifr_name) + size(ifr->ifr_addr)) { ifr = (struct ifreq *)cp; if (ifr->ifr_addr.sa_family != AF_INET) continue; ifreq = *ifr; if (ioctl(sock, SIOCGIFFLAGS, (char *)&ifreq) < 0) { perror("broadcast: ioctl (get interface flags)"); continue; } if ((ifreq.ifr_flags & IFF_BROADCAST) && (ifreq.ifr_flags & IFF_UP)) { sin = (struct sockaddr_in *)&ifr->ifr_addr; if (ioctl(sock, SIOCGIFBRDADDR, (char *)&ifreq) < 0) { addrs[i++] = inet_makeaddr(inet_netof(sin->sin_addr), INADDR_ANY); } else { addrs[i++] = ((struct sockaddr_in*) &ifreq.ifr_addr)->sin_addr; } } } free(inbuf); *addrsp = addrs; return (i); } typedef bool_t (*resultproc_t)(); enum clnt_stat clnt_broadcast(prog, vers, proc, xargs, argsp, xresults, resultsp, eachresult) u_long prog; /* program number */ u_long vers; /* version number */ u_long proc; /* procedure number */ xdrproc_t xargs; /* xdr routine for args */ caddr_t argsp; /* pointer to args */ xdrproc_t xresults; /* xdr routine for results */ caddr_t resultsp; /* pointer to results */ resultproc_t eachresult; /* call with each result obtained */ { enum clnt_stat stat; AUTH *unix_auth = authunix_create_default(); XDR xdr_stream; register XDR *xdrs = &xdr_stream; int outlen, inlen, fromlen, nets; register int sock = -1; int on = 1; fd_set *fds, readfds; register int i; bool_t done = FALSE; register u_long xid; u_long port; struct in_addr *addrs; struct sockaddr_in baddr, raddr; /* broadcast and response addresses */ struct rmtcallargs a; struct rmtcallres r; struct rpc_msg msg; struct timeval t; 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 */ if (sock+1 > FD_SETSIZE) { int bytes = howmany(sock+1, NFDBITS) * sizeof(fd_mask); fds = (fd_set *)malloc(bytes); if (fds == NULL) { stat = RPC_CANTSEND; goto done_broad; } memset(fds, 0, bytes); } else { fds = &readfds; FD_ZERO(fds); } nets = newgetbroadcastnets(&addrs, sock); memset(&baddr, 0, sizeof (baddr)); baddr.sin_len = sizeof(struct sockaddr_in); baddr.sin_family = AF_INET; baddr.sin_port = htons(PMAPPORT); baddr.sin_addr.s_addr = htonl(INADDR_ANY); (void)gettimeofday(&t, (struct timezone *)0); msg.rm_xid = xid = arc4random(); 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. * * XXX This will loop about 5 times the stop. If there are * lots of signals being received by the process it will quit * send them all in one quick burst, not paying attention to * the intended function of sending them slowly over half a * minute or so */ 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 = xdr_rmtcallres; /* XXX we know the other bits are still clear */ FD_SET(sock, fds); switch (select(sock+1, fds, NULL, NULL, &t)) { case 0: /* timed out */ stat = RPC_TIMEDOUT; continue; case -1: /* some kind of error */ if (errno == EINTR) goto recv_again; perror("Broadcast select problem"); stat = RPC_CANTRECV; goto done_broad; } 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 (inlen < sizeof(u_int32_t)) 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 ((msg.rm_xid == 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 ... */ } xdrs->x_op = XDR_FREE; msg.acpted_rply.ar_results.proc = 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: if (addrs) free(addrs); if (fds != &readfds) free(fds); if (sock >= 0) (void)close(sock); AUTH_DESTROY(unix_auth); return (stat); }