4.3BSD - /usr/src/new/sunrpc/clnt_udp.c

   1: /*
   2:  * Sun RPC is a product of Sun Microsystems, Inc. and is provided for
   3:  * unrestricted use provided that this legend is included on all tape
   4:  * media and as a part of the software program in whole or part.  Users
   5:  * may copy or modify Sun RPC without charge, but are not authorized
   6:  * to license or distribute it to anyone else except as part of a product or
   7:  * program developed by the user.
   8:  *
   9:  * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE
  10:  * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR
  11:  * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE.
  12:  *
  13:  * Sun RPC is provided with no support and without any obligation on the
  14:  * part of Sun Microsystems, Inc. to assist in its use, correction,
  15:  * modification or enhancement.
  16:  *
  17:  * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE
  18:  * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC
  19:  * OR ANY PART THEREOF.
  20:  *
  21:  * In no event will Sun Microsystems, Inc. be liable for any lost revenue
  22:  * or profits or other special, indirect and consequential damages, even if
  23:  * Sun has been advised of the possibility of such damages.
  24:  *
  25:  * Sun Microsystems, Inc.
  26:  * 2550 Garcia Avenue
  27:  * Mountain View, California  94043
  28:  */
  29: #ifndef lint
  30: static char sccsid[] = "@(#)clnt_udp.c 1.5 85/03/17 Copyr 1984 Sun Micro";
  31: #endif
  32: 
  33: /*
  34:  * clnt_udp.c, Implements a UPD/IP based, client side RPC.
  35:  *
  36:  * Copyright (C) 1984, Sun Microsystems, Inc.
  37:  */
  38: 
  39: #include <stdio.h>
  40: #include "types.h"
  41: #include <sys/socket.h>
  42: #include <sys/time.h>
  43: #include <netinet/in.h>
  44: #include <netdb.h>
  45: #include <errno.h>
  46: #include "xdr.h"
  47: #include "auth.h"
  48: #include "clnt.h"
  49: #include "rpc_msg.h"
  50: #include "pmap_clnt.h"
  51: 
  52: char *malloc();
  53: extern int errno;
  54: long random();
  55: 
  56: /*
  57:  * UDP bases client side rpc operations
  58:  */
  59: static enum clnt_stat   clntudp_call();
  60: static void     clntudp_abort();
  61: static void     clntudp_geterr();
  62: static bool_t       clntudp_freeres();
  63: static void     clntudp_destroy();
  64: 
  65: static struct clnt_ops udp_ops = {
  66:     clntudp_call,
  67:     clntudp_abort,
  68:     clntudp_geterr,
  69:     clntudp_freeres,
  70:     clntudp_destroy
  71: };
  72: 
  73: /*
  74:  * Private data kept per client handle
  75:  */
  76: struct cu_data {
  77:     int        cu_sock;
  78:     struct sockaddr_in cu_raddr;
  79:     int        cu_rlen;
  80:     struct timeval     cu_wait;
  81:     struct rpc_err     cu_error;
  82:     XDR        cu_outxdrs;
  83:     u_int          cu_xdrpos;
  84:     char           cu_outbuf[UDPMSGSIZE];
  85:     char           cu_inbuf[UDPMSGSIZE];
  86: };
  87: 
  88: /*
  89:  * Create a UDP based client handle.
  90:  * If *sockp<0, *sockp is set to a newly created UPD socket.
  91:  * If raddr->sin_port is 0 a binder on the remote machine
  92:  * is consulted for the correct port number.
  93:  * NB: It is the clients responsibility to close *sockp.
  94:  * NB: The rpch->cl_auth is initialized to null authentication.
  95:  *     Caller may wish to set this something more useful.
  96:  *
  97:  * wait is the amount of time used between retransmitting a call if
  98:  * no response has been heard;  retransmition occurs until the actual
  99:  * rpc call times out.
 100:  */
 101: CLIENT *
 102: clntudp_create(raddr, program, version, wait, sockp)
 103:     struct sockaddr_in *raddr;
 104:     u_long program;
 105:     u_long version;
 106:     struct timeval wait;
 107:     register int *sockp;
 108: {
 109:     CLIENT *cl;
 110:     register struct cu_data *cu;
 111:     struct timeval now;
 112:     struct rpc_msg call_msg;
 113: 
 114:     cl = (CLIENT *)mem_alloc(sizeof(CLIENT));
 115:     if (cl == NULL) {
 116:         fprintf(stderr, "clntudp_create: out of memory\n");
 117:         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 118:         rpc_createerr.cf_error.re_errno = errno;
 119:         goto fooy;
 120:     }
 121:     cu = (struct cu_data *)mem_alloc(sizeof(*cu));
 122:     if (cu == NULL) {
 123:         fprintf(stderr, "clntudp_create: out of memory\n");
 124:         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 125:         rpc_createerr.cf_error.re_errno = errno;
 126:         goto fooy;
 127:     }
 128: 
 129:     (void)gettimeofday(&now, (struct timezone *)0);
 130:     if (raddr->sin_port == 0) {
 131:         u_short port;
 132:         if ((port =
 133:             pmap_getport(raddr, program, version, IPPROTO_UDP)) == 0) {
 134:             goto fooy;
 135:         }
 136:         raddr->sin_port = htons(port);
 137:     }
 138:     cl->cl_ops = &udp_ops;
 139:     cl->cl_private = (caddr_t)cu;
 140:     cu->cu_raddr = *raddr;
 141:     cu->cu_rlen = sizeof (cu->cu_raddr);
 142:     cu->cu_wait = wait;
 143:     call_msg.rm_xid = getpid() ^ (int)random() ^ now.tv_sec ^ now.tv_usec;
 144:     call_msg.rm_direction = CALL;
 145:     call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
 146:     call_msg.rm_call.cb_prog = program;
 147:     call_msg.rm_call.cb_vers = version;
 148:     xdrmem_create(&(cu->cu_outxdrs), cu->cu_outbuf,
 149:         UDPMSGSIZE, XDR_ENCODE);
 150:     if (! xdr_callhdr(&(cu->cu_outxdrs), &call_msg)) {
 151:         goto fooy;
 152:     }
 153:     cu->cu_xdrpos = XDR_GETPOS(&(cu->cu_outxdrs));
 154:     cu->cu_sock = (*sockp < 0) ?
 155:         (*sockp = socket(AF_INET, SOCK_DGRAM, IPPROTO_UDP)) :
 156:         *sockp;
 157:     if (cu->cu_sock < 0) {
 158:         rpc_createerr.cf_stat = RPC_SYSTEMERROR;
 159:         rpc_createerr.cf_error.re_errno = errno;
 160:         goto fooy;
 161:     }
 162:     cl->cl_auth = authnone_create();
 163:     return (cl);
 164: fooy:
 165:     mem_free((caddr_t)cu, sizeof(*cu));
 166:     mem_free((caddr_t)cl, sizeof(CLIENT));
 167:     return ((CLIENT *)NULL);
 168: }
 169: 
 170: static enum clnt_stat
 171: clntudp_call(cl, proc, xargs, argsp, xresults, resultsp, timeout)
 172:     register CLIENT *cl;        /* client handle */
 173:     u_long      proc;       /* procedure number */
 174:     xdrproc_t   xargs;      /* xdr routine for args */
 175:     caddr_t     argsp;      /* pointer to args */
 176:     xdrproc_t   xresults;   /* xdr routine for results */
 177:     caddr_t     resultsp;   /* pointer to results */
 178:     struct timeval  timeout;    /* seconds to wait before giving up */
 179: {
 180:     register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 181:     register XDR *xdrs;
 182:     register int outlen;
 183:     register int inlen;
 184:     int readfds, fromlen;
 185:     register int mask;
 186:     struct sockaddr_in from;
 187:     struct rpc_msg reply_msg;
 188:     XDR reply_xdrs;
 189:     struct timeval time_waited;
 190:     bool_t ok;
 191: 
 192: call_again:
 193:     time_waited.tv_sec = 0;
 194:     time_waited.tv_usec = 0;
 195:     xdrs = &(cu->cu_outxdrs);
 196:     xdrs->x_op = XDR_ENCODE;
 197:     XDR_SETPOS(xdrs, cu->cu_xdrpos);
 198:     /*
 199: 	 * the transaction is the first thing in the out buffer
 200: 	 */
 201:     (*(u_short *)(cu->cu_outbuf))++;
 202:     if ((! XDR_PUTLONG(xdrs, (long *)&proc)) ||
 203:         (! AUTH_MARSHALL(cl->cl_auth, xdrs)) ||
 204:         (! (*xargs)(xdrs, argsp)))
 205:         return (cu->cu_error.re_status = RPC_CANTENCODEARGS);
 206:     outlen = (int)XDR_GETPOS(xdrs);
 207:     while (TRUE) {
 208: 
 209:         if (sendto(cu->cu_sock, cu->cu_outbuf, outlen, 0,
 210:             (struct sockaddr *)&(cu->cu_raddr), cu->cu_rlen)
 211:             != outlen) {
 212:             cu->cu_error.re_errno = errno;
 213:             return (cu->cu_error.re_status = RPC_CANTSEND);
 214:         }
 215:         /*
 216: 		 * sub-optimal code appears inside the loop because we have
 217: 		 * some clock time to spare while the packets are in flight.
 218: 		 * (We assume that this is actually only executed once.)
 219: 		 */
 220:         reply_msg.acpted_rply.ar_verf = _null_auth;
 221:         reply_msg.acpted_rply.ar_results.where = resultsp;
 222:         reply_msg.acpted_rply.ar_results.proc = xresults;
 223:         mask = 1 << cu->cu_sock;
 224: rcv_again:
 225:         readfds = mask;
 226:         switch (select(32, &readfds, (int *)NULL, (int *)NULL,
 227:             &(cu->cu_wait))) {
 228: 
 229:         case 0:
 230:             time_waited.tv_sec += cu->cu_wait.tv_sec;
 231:             time_waited.tv_usec += cu->cu_wait.tv_usec;
 232:             while (time_waited.tv_usec >= 1000000) {
 233:                 time_waited.tv_sec++;
 234:                 time_waited.tv_usec -= 1000000;
 235:             }
 236:             if ((time_waited.tv_sec < timeout.tv_sec) ||
 237:                 ((time_waited.tv_sec == timeout.tv_sec) &&
 238:                 (time_waited.tv_usec < timeout.tv_usec)))
 239:                 continue;
 240:             return (cu->cu_error.re_status = RPC_TIMEDOUT);
 241: 
 242:         case -1:
 243:             if (errno == EINTR)
 244:                 goto rcv_again;
 245:             cu->cu_error.re_errno = errno;
 246:             return (cu->cu_error.re_status = RPC_CANTRECV);
 247:         }
 248:         if ((readfds & mask) == 0)
 249:             goto rcv_again;
 250: tryagain:
 251:         fromlen = sizeof(struct sockaddr);
 252:         inlen = recvfrom(cu->cu_sock, cu->cu_inbuf, UDPMSGSIZE, 0,
 253:             (struct sockaddr *)&from, &fromlen);
 254:         if (inlen < 0) {
 255:             if (errno == EINTR)
 256:                 goto tryagain;
 257:             cu->cu_error.re_errno = errno;
 258:             return (cu->cu_error.re_status = RPC_CANTRECV);
 259:         }
 260:         if (inlen < sizeof(u_long))
 261:             goto rcv_again;
 262:         /* see if reply transaction id matches sent id */
 263:         if (*((u_long *)(cu->cu_inbuf)) != *((u_long *)(cu->cu_outbuf)))
 264:             goto rcv_again;
 265:         /* we now assume we have the proper reply */
 266:         break;
 267:     }
 268: 
 269:     /*
 270: 	 * now decode and validate the response
 271: 	 */
 272:     xdrmem_create(&reply_xdrs, cu->cu_inbuf, (u_int)inlen, XDR_DECODE);
 273:     ok = xdr_replymsg(&reply_xdrs, &reply_msg);
 274:     /* XDR_DESTROY(&reply_xdrs);  save a few cycles on noop destroy */
 275:     if (ok) {
 276:         _seterr_reply(&reply_msg, &(cu->cu_error));
 277:         if (cu->cu_error.re_status == RPC_SUCCESS) {
 278:             if (! AUTH_VALIDATE(cl->cl_auth,
 279:                 &reply_msg.acpted_rply.ar_verf)) {
 280:                 cu->cu_error.re_status = RPC_AUTHERROR;
 281:                 cu->cu_error.re_why = AUTH_INVALIDRESP;
 282:             }
 283:             if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
 284:                 xdrs->x_op = XDR_FREE;
 285:                 (void)xdr_opaque_auth(xdrs,
 286:                     &(reply_msg.acpted_rply.ar_verf));
 287:             }
 288:         }  /* end successful completion */
 289:         else {
 290:             /* maybe our credentials need to be refreshed ... */
 291:             if (AUTH_REFRESH(cl->cl_auth))
 292:                 goto call_again;
 293:         }  /* end of unsuccessful completion */
 294:     }  /* end of valid reply message */
 295:     else {
 296:         cu->cu_error.re_status = RPC_CANTDECODERES;
 297:     }
 298:     return (cu->cu_error.re_status);
 299: }
 300: 
 301: static void
 302: clntudp_geterr(cl, errp)
 303:     CLIENT *cl;
 304:     struct rpc_err *errp;
 305: {
 306:     register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 307: 
 308:     *errp = cu->cu_error;
 309: }
 310: 
 311: 
 312: static bool_t
 313: clntudp_freeres(cl, xdr_res, res_ptr)
 314:     CLIENT *cl;
 315:     xdrproc_t xdr_res;
 316:     caddr_t res_ptr;
 317: {
 318:     register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 319:     register XDR *xdrs = &(cu->cu_outxdrs);
 320: 
 321:     xdrs->x_op = XDR_FREE;
 322:     return ((*xdr_res)(xdrs, res_ptr));
 323: }
 324: 
 325: static void
 326: clntudp_abort(/*h*/)
 327:     /*CLIENT *h;*/
 328: {
 329: }
 330: 
 331: static void
 332: clntudp_destroy(cl)
 333:     CLIENT *cl;
 334: {
 335:     register struct cu_data *cu = (struct cu_data *)cl->cl_private;
 336: 
 337:     XDR_DESTROY(&(cu->cu_outxdrs));
 338:     mem_free((caddr_t)cu, sizeof(*cu));
 339:     mem_free((caddr_t)cl, sizeof(CLIENT));
 340: }

Defined functions

Defined variables

Defined struct's