#ifndef lint static char rcs_id[] = {"$Header: clnt_udp.c,v 1.1 86/09/05 09:16:33 tadl Exp $"}; #endif not lint /* * RCS Info * $Locker: tadl $ */ /* NFSSRC @(#)clnt_udp.c 2.1 86/04/14 */ #ifndef lint static char sccsid[] = "@(#)clnt_udp.c 1.1 86/02/03 Copyr 1984 Sun Micro"; #endif /* * clnt_udp.c, Implements a UPD/IP based, client side RPC. * * Copyright (C) 1984, Sun Microsystems, Inc. */ #include <stdio.h> #include "types.h" #include <sys/socket.h> #include <sys/time.h> #include <sys/ioctl.h> #include <netinet/in.h> #include <netdb.h> #include <errno.h> #include "xdr.h" #include "auth.h" #include "clnt.h" #include "rpc_msg.h" #include "pmap_clnt.h" char *malloc(); extern int errno; /* * UDP bases client side rpc operations */ static enum clnt_stat clntudp_call(); static void clntudp_abort(); static void clntudp_geterr(); static bool_t clntudp_freeres(); static void clntudp_destroy(); static struct clnt_ops udp_ops = { clntudp_call, clntudp_abort, clntudp_geterr, clntudp_freeres, clntudp_destroy }; /* * Private data kept per client handle */ struct cu_data { int cu_sock; struct sockaddr_in cu_raddr; int cu_rlen; struct timeval cu_wait; struct rpc_err cu_error; XDR cu_outxdrs; u_int cu_xdrpos; u_int cu_sendsz; char *cu_outbuf; u_int cu_recvsz; char cu_inbuf[1]; }; /* * Create a UDP based client handle. * If *sockp<0, *sockp is set to a newly created UPD socket. * If raddr->sin_port is 0 a binder on the remote machine * is consulted for the correct port number. * NB: It is the clients responsibility to close *sockp. * NB: The rpch->cl_auth is initialized to null authentication. * Caller may wish to set this something more useful. * * wait is the amount of time used between retransmitting a call if * no response has been heard; retransmition occurs until the actual * rpc call times out. * * sendsz and recvsz are the maximum allowable packet sizes that can be * sent and received. */ CLIENT * clntudp_bufcreate(raddr, program, version, wait, sockp, sendsz, recvsz) struct sockaddr_in *raddr; u_long program; u_long version; struct timeval wait; register int *sockp; u_int sendsz; u_int recvsz; { CLIENT *cl; register struct cu_data *cu; struct timeval now; struct rpc_msg call_msg; cl = (CLIENT *)mem_alloc(sizeof(CLIENT)); if (cl == NULL) { fprintf(stderr, "clntudp_create: out of memory\n"); rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; goto fooy; } sendsz = ((sendsz + 3) / 4) * 4; recvsz = ((recvsz + 3) / 4) * 4; cu = (struct cu_data *)mem_alloc(sizeof(*cu) + sendsz + recvsz); if (cu == NULL) { fprintf(stderr, "clntudp_create: out of memory\n"); rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; goto fooy; } cu->cu_outbuf = &cu->cu_inbuf[recvsz]; (void)gettimeofday(&now, (struct timezone *)0); if (raddr->sin_port == 0) { u_short port; if ((port = pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) { goto fooy; } raddr->sin_port = htons(port); } cl->cl_ops = &udp_ops; cl->cl_private = (caddr_t)cu; cu->cu_raddr = *raddr; cu->cu_rlen = sizeof (cu->cu_raddr); cu->cu_wait = wait; cu->cu_sendsz = sendsz; cu->cu_recvsz = recvsz; call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec; call_msg.rm_direction = CALL; call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION; call_msg.rm_call.cb_prog = program; call_msg.rm_call.cb_vers = version; xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf, sendsz, XDR_ENCODE); if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) { goto fooy; } cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs)); if (*sockp < 0) { int dontblock = 1; *sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP); if (*sockp < 0) { rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; goto fooy; } /* the sockets rpc controls are non-blocking */ (void)ioctl(*sockp, FIONBIO, &dontblock); } cu->cu_sock = *sockp; cl->cl_auth = authnone_create(); return (cl); fooy: if (cu) mem_free((caddr_t)cu, sizeof(*cu) + sendsz + recvsz); if (cl) mem_free((caddr_t)cl, sizeof(CLIENT)); return ((CLIENT *)NULL); } CLIENT * clntudp_create(raddr, program, version, wait, sockp) struct sockaddr_in *raddr; u_long program; u_long version; struct timeval wait; register int *sockp; { return(clntudp_bufcreate(raddr, program, version, wait, sockp, UDPMSGSIZE, UDPMSGSIZE)); } static enum clnt_stat clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, timeout) register CLIENT *cl; /* client handle */ 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 */ struct timeval timeout; /* seconds to wait before giving up */ { register struct cu_data *cu = (struct cu_data *)cl->cl_private; register XDR *xdrs; register int outlen; register int inlen; int readfds, fromlen; register int mask; struct sockaddr_in from; struct rpc_msg reply_msg; XDR reply_xdrs; struct timeval time_waited; bool_t ok; call_again: time_waited.tv_sec = 0; time_waited.tv_usec = 0; xdrs = &(cu->cu_outxdrs); xdrs->x_op = XDR_ENCODE; XDR_SETPOS(xdrs, cu->cu_xdrpos); /* * the transaction is the first thing in the out buffer */ (*(u_short *)(cu->cu_outbuf))++; if ((! XDR_PUTLONG(xdrs, (long *)&proc)) || (! AUTH_MARSHALL(cl->cl_auth, xdrs)) || (! (*xargs)(xdrs, argsp))) return (cu->cu_error.re_status = RPC_CANTENCODEARGS); outlen = (int)XDR_GETPOS(xdrs); while (TRUE) { if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0, (struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen) != outlen) { cu->cu_error.re_errno = errno; return (cu->cu_error.re_status = RPC_CANTSEND); } /* * sub-optimal code appears inside the loop because we have * some clock time to spare while the packets are in flight. * (We assume that this is actually only executed once.) */ reply_msg.acpted_rply.ar_verf = _null_auth; reply_msg.acpted_rply.ar_results.where = resultsp; reply_msg.acpted_rply.ar_results.proc = xresults; mask = 1 << cu->cu_sock; rcv_again: readfds = mask; switch (select(32, &readfds, (int *)NULL, (int *)NULL, &(cu->cu_wait))) { case 0: time_waited.tv_sec += cu->cu_wait.tv_sec; time_waited.tv_usec += cu->cu_wait.tv_usec; while (time_waited.tv_usec >= 1000000) { time_waited.tv_sec++; time_waited.tv_usec -= 1000000; } if ((time_waited.tv_sec < timeout.tv_sec) || ((time_waited.tv_sec == timeout.tv_sec) && (time_waited.tv_usec < timeout.tv_usec))) continue; return (cu->cu_error.re_status = RPC_TIMEDOUT); case -1: if (errno == EINTR) goto rcv_again; cu->cu_error.re_errno = errno; return (cu->cu_error.re_status = RPC_CANTRECV); } if ((readfds & mask) == 0) goto rcv_again; tryagain: fromlen = sizeof(struct sockaddr); inlen = recvfrom(cu->cu_sock, cu->cu_inbuf, cu->cu_recvsz, 0, (struct sockaddr *)&from, &fromlen); if (inlen < 0) { if (errno == EINTR) goto tryagain; if (errno == EWOULDBLOCK) goto rcv_again; cu->cu_error.re_errno = errno; return (cu->cu_error.re_status = RPC_CANTRECV); } if (inlen < sizeof(u_long)) goto rcv_again; /* see if reply transaction id matches sent id */ if (*((u_long *)(cu->cu_inbuf)) != *((u_long *)(cu->cu_outbuf))) goto rcv_again; /* we now assume we have the proper reply */ break; } /* * now decode and validate the response */ xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE); ok = xdr_replymsg(&reply_xdrs, &reply_msg); /* XDR_DESTROY(&reply_xdrs); save a few cycles on noop destroy */ if (ok) { _seterr_reply(&reply_msg, &(cu->cu_error)); if (cu->cu_error.re_status == RPC_SUCCESS) { if (! AUTH_VALIDATE(cl->cl_auth, &reply_msg.acpted_rply.ar_verf)) { cu->cu_error.re_status = RPC_AUTHERROR; cu->cu_error.re_why = AUTH_INVALIDRESP; } if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) { xdrs->x_op = XDR_FREE; (void)xdr_opaque_auth(xdrs, &(reply_msg.acpted_rply.ar_verf)); } } /* end successful completion */ else { /* maybe our credentials need to be refreshed ... */ if (AUTH_REFRESH(cl->cl_auth)) goto call_again; } /* end of unsuccessful completion */ } /* end of valid reply message */ else { cu->cu_error.re_status = RPC_CANTDECODERES; } return (cu->cu_error.re_status); } static void clntudp_geterr(cl, errp) CLIENT *cl; struct rpc_err *errp; { register struct cu_data *cu = (struct cu_data *)cl->cl_private; *errp = cu->cu_error; } static bool_t clntudp_freeres(cl, xdr_res, res_ptr) CLIENT *cl; xdrproc_t xdr_res; caddr_t res_ptr; { register struct cu_data *cu = (struct cu_data *)cl->cl_private; register XDR *xdrs = &(cu->cu_outxdrs); xdrs->x_op = XDR_FREE; return ((*xdr_res)(xdrs, res_ptr)); } static void clntudp_abort(/*h*/) /*CLIENT *h;*/ { } static void clntudp_destroy(cl) CLIENT *cl; { register struct cu_data *cu = (struct cu_data *)cl->cl_private; XDR_DESTROY(&(cu->cu_outxdrs)); mem_free((caddr_t)cu, (sizeof(*cu) + cu->cu_sendsz + cu->cu_recvsz)); mem_free((caddr_t)cl, sizeof(CLIENT)); }