clnt_udp.c /* @(#)clnt_udp.c 2.2 88/08/01 4.0 RPCSRC */ /* * 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(lint) && defined(SCCSIDS) static char sccsid[] = "@(#)clnt_udp.c 1.39 87/08/11 Copyr 1984 Sun Micro"; #endif /* * clnt_udp.c, Implements a UDP/IP based, client side RPC. * * Copyright (C) 1984, Sun Microsystems, Inc. */ #include <stdio.h> #include <rpc/rpc.h> #include <sys/socket.h> #include <sys/ioctl.h> #include <netdb.h> #include <errno.h> #include <rpc/pmap_clnt.h> #ifdef __STDC__ #include <stdlib.h> #endif #if NLS #include "nl_types.h" #endif /* * 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 bool_t clntudp_control(); static void clntudp_destroy(); static struct clnt_ops udp_ops = { clntudp_call, clntudp_abort, clntudp_geterr, clntudp_freeres, clntudp_destroy, clntudp_control }; /* * Private data kept per client handle */ struct cu_data { int cu_sock; bool_t cu_closeit; struct sockaddr_in cu_raddr; int cu_rlen; struct timeval cu_wait; struct timeval cu_total; 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 = NULL; struct timeval now; struct rpc_msg call_msg; #if NLS libc_nls_init(); #endif cl = (CLIENT *)mem_alloc(sizeof(CLIENT)); if (cl == NULL) { #if NLS (void) fprintf(stderr, "clntudp_create: %s\n", catgets(_libc_cat, RpcMiscSet, RpcMiscOutOfMemory, "out of memory")); #else (void) fprintf(stderr, "clntudp_create: out of memory\n"); #endif 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) { #if NLS (void) fprintf(stderr, "clntudp_create: %s\n", catgets(_libc_cat, RpcMiscSet, RpcMiscOutOfMemory, "out of memory")); #else (void) fprintf(stderr, "clntudp_create: out of memory\n"); #endif 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_total.tv_sec = -1; cu->cu_total.tv_usec = -1; 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; } /* attempt to bind to prov port */ (void)bindresvport(*sockp, (struct sockaddr_in *)0); /* the sockets rpc controls are non-blocking */ (void)ioctl(*sockp, FIONBIO, (char *) &dontblock); cu->cu_closeit = TRUE; } else { cu->cu_closeit = FALSE; } 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, utimeout) 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 utimeout; /* 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 fromlen; #ifdef FD_SETSIZE fd_set readfds; fd_set mask; #else int readfds; register int mask; #endif /* def FD_SETSIZE */ struct sockaddr_in from; struct rpc_msg reply_msg; XDR reply_xdrs; struct timeval time_waited; bool_t ok; int nrefreshes = 2; /* number of times to refresh cred */ struct timeval timeout; if (cu->cu_total.tv_usec == -1) { timeout = utimeout; /* use supplied timeout */ } else { timeout = cu->cu_total; /* use default timeout */ } time_waited.tv_sec = 0; time_waited.tv_usec = 0; call_again: 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); send_again: 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); } /* * Hack to provide rpc-based message passing */ if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { return (cu->cu_error.re_status = RPC_TIMEDOUT); } /* * sub-optimal code appears here 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; #ifdef FD_SETSIZE FD_ZERO(&mask); FD_SET(cu->cu_sock, &mask); #else mask = 1 << cu->cu_sock; #endif /* def FD_SETSIZE */ for (;;) { #ifdef linux struct timeval oneshot_timeout; readfds = mask; oneshot_timeout = cu->cu_wait; switch (select(_rpc_dtablesize(), &readfds, (void *)NULL, (void *)NULL, &oneshot_timeout)) { #else readfds = mask; switch (select(_rpc_dtablesize(), &readfds, (void *)NULL, (void *)NULL, &(cu->cu_wait))) { #endif 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))) goto send_again; return (cu->cu_error.re_status = RPC_TIMEDOUT); /* * buggy in other cases because time_waited is not being * updated. */ case -1: if (errno == EINTR) continue; cu->cu_error.re_errno = errno; return (cu->cu_error.re_status = RPC_CANTRECV); } do { fromlen = sizeof(struct sockaddr); inlen = recvfrom(cu->cu_sock, cu->cu_inbuf, (int) cu->cu_recvsz, 0, (struct sockaddr *)&from, &fromlen); } while (inlen < 0 && errno == EINTR); if (inlen < 0) { #ifdef linux if (errno == EWOULDBLOCK || errno == EAGAIN) #else if (errno == EWOULDBLOCK) #endif continue; cu->cu_error.re_errno = errno; return (cu->cu_error.re_status = RPC_CANTRECV); } if (inlen < sizeof(u_long)) continue; /* see if reply transaction id matches sent id */ if (*((u_long *)(cu->cu_inbuf)) != *((u_long *)(cu->cu_outbuf))) continue; /* 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 (nrefreshes > 0 && AUTH_REFRESH(cl->cl_auth)) { nrefreshes--; 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 bool_t clntudp_control(cl, request, info) CLIENT *cl; int request; char *info; { register struct cu_data *cu = (struct cu_data *)cl->cl_private; switch (request) { case CLSET_TIMEOUT: cu->cu_total = *(struct timeval *)info; break; case CLGET_TIMEOUT: *(struct timeval *)info = cu->cu_total; break; case CLSET_RETRY_TIMEOUT: cu->cu_wait = *(struct timeval *)info; break; case CLGET_RETRY_TIMEOUT: *(struct timeval *)info = cu->cu_wait; break; case CLGET_SERVER_ADDR: *(struct sockaddr_in *)info = cu->cu_raddr; break; default: return (FALSE); } return (TRUE); } static void clntudp_destroy(cl) CLIENT *cl; { register struct cu_data *cu = (struct cu_data *)cl->cl_private; if (cu->cu_closeit) { (void)close(cu->cu_sock); } 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)); }