1 /* @(#)clnt_tcp.c 2.2 88/08/01 4.0 RPCSRC */
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34 * clnt_tcp.c, Implements a TCP/IP based, client side RPC.
36 * Copyright (C) 1984, Sun Microsystems, Inc.
38 * TCP based RPC supports 'batched calls'.
39 * A sequence of calls may be batched-up in a send buffer. The rpc call
40 * return immediately to the client even though the call was not necessarily
41 * sent. The batching occurs if the results' xdr routine is NULL (0) AND
42 * the rpc timeout value is zero (see clnt.h, rpc).
44 * Clients should NOT casually batch calls that in fact return results; that is,
45 * the server side should be aware that a call is batched and not produce any
46 * return message. Batched calls that produce many result messages can
47 * deadlock (netlock) the client and the server....
49 * Now go hang yourself.
54 #include <sys/socket.h>
57 #include <rpc/pmap_clnt.h>
60 #define MCALL_MSG_SIZE 24
65 static int writetcp();
67 static enum clnt_stat clnttcp_call();
68 static void clnttcp_abort();
69 static void clnttcp_geterr();
70 static bool_t clnttcp_freeres();
71 static bool_t clnttcp_control();
72 static void clnttcp_destroy();
74 static struct clnt_ops tcp_ops = {
86 struct timeval ct_wait;
87 bool_t ct_waitset; /* wait set by clnt_control? */
88 struct sockaddr_in ct_addr;
89 struct rpc_err ct_error;
90 char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */
91 u_int ct_mpos; /* pos after marshal */
96 * Create a client handle for a tcp/ip connection.
97 * If *sockp<0, *sockp is set to a newly created TCP socket and it is
98 * connected to raddr. If *sockp non-negative then
99 * raddr is ignored. The rpc/tcp package does buffering
100 * similar to stdio, so the client must pick send and receive buffer sizes,];
101 * 0 => use the default.
102 * If raddr->sin_port is 0, then a binder on the remote machine is
103 * consulted for the right port number.
104 * NB: *sockp is copied into a private area.
105 * NB: It is the clients responsibility to close *sockp.
106 * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this
107 * something more useful.
109 CLIENT *clnttcp_create(raddr, prog, vers, sockp, sendsz, recvsz)
110 struct sockaddr_in *raddr;
118 register struct ct_data *ct;
120 struct rpc_msg call_msg;
122 ct = NULL; /* in case of fooy */
123 h = (CLIENT *) mem_alloc(sizeof(*h));
125 (void) fprintf(stderr, "clnttcp_create: out of memory\n");
126 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
127 rpc_createerr.cf_error.re_errno = errno;
130 ct = (struct ct_data *) mem_alloc(sizeof(*ct));
132 (void) fprintf(stderr, "clnttcp_create: out of memory\n");
133 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
134 rpc_createerr.cf_error.re_errno = errno;
139 * If no port number given ask the pmap for one
141 if (raddr->sin_port == 0) {
144 if ((port = pmap_getport(raddr, prog, vers, IPPROTO_TCP)) == 0) {
145 mem_free((caddr_t) ct, sizeof(struct ct_data));
147 mem_free((caddr_t) h, sizeof(CLIENT));
148 return ((CLIENT *) NULL);
150 raddr->sin_port = htons(port);
154 * If no socket given, open one
157 *sockp = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP);
158 (void) bindresvport(*sockp, (struct sockaddr_in *) 0);
160 || (connect(*sockp, (struct sockaddr *) raddr,
161 sizeof(*raddr)) < 0)) {
162 rpc_createerr.cf_stat = RPC_SYSTEMERROR;
163 rpc_createerr.cf_error.re_errno = errno;
164 (void) close(*sockp);
167 ct->ct_closeit = TRUE;
169 ct->ct_closeit = FALSE;
173 * Set up private data struct
175 ct->ct_sock = *sockp;
176 ct->ct_wait.tv_usec = 0;
177 ct->ct_waitset = FALSE;
178 ct->ct_addr = *raddr;
181 * Initialize call message
183 (void) gettimeofday(&now, (struct timezone *) 0);
184 call_msg.rm_xid = getpid() ^ now.tv_sec ^ now.tv_usec;
185 call_msg.rm_direction = CALL;
186 call_msg.rm_call.cb_rpcvers = RPC_MSG_VERSION;
187 call_msg.rm_call.cb_prog = prog;
188 call_msg.rm_call.cb_vers = vers;
191 * pre-serialize the staic part of the call msg and stash it away
193 xdrmem_create(&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE,
195 if (!xdr_callhdr(&(ct->ct_xdrs), &call_msg)) {
196 if (ct->ct_closeit) {
197 (void) close(*sockp);
201 ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs));
202 XDR_DESTROY(&(ct->ct_xdrs));
205 * Create a client handle which uses xdrrec for serialization
206 * and authnone for authentication.
208 xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz,
209 (caddr_t) ct, readtcp, writetcp);
210 h->cl_ops = &tcp_ops;
211 h->cl_private = (caddr_t) ct;
212 h->cl_auth = authnone_create();
217 * Something goofed, free stuff and barf
219 mem_free((caddr_t) ct, sizeof(struct ct_data));
221 mem_free((caddr_t) h, sizeof(CLIENT));
222 return ((CLIENT *) NULL);
225 static enum clnt_stat
226 clnttcp_call(h, proc, xdr_args, args_ptr, xdr_results, results_ptr,
232 xdrproc_t xdr_results;
234 struct timeval timeout;
236 register struct ct_data *ct = (struct ct_data *) h->cl_private;
237 register XDR *xdrs = &(ct->ct_xdrs);
238 struct rpc_msg reply_msg;
240 u_long *msg_x_id = (u_long *) (ct->ct_mcall); /* yuk */
241 register bool_t shipnow;
244 if (!ct->ct_waitset) {
245 ct->ct_wait = timeout;
249 (xdr_results == (xdrproc_t) 0 && timeout.tv_sec == 0
250 && timeout.tv_usec == 0) ? FALSE : TRUE;
253 xdrs->x_op = XDR_ENCODE;
254 ct->ct_error.re_status = RPC_SUCCESS;
255 x_id = ntohl(--(*msg_x_id));
256 if ((!XDR_PUTBYTES(xdrs, ct->ct_mcall, ct->ct_mpos)) ||
257 (!XDR_PUTLONG(xdrs, (long *) &proc)) ||
258 (!AUTH_MARSHALL(h->cl_auth, xdrs)) ||
259 (!(*xdr_args) (xdrs, args_ptr))) {
260 if (ct->ct_error.re_status == RPC_SUCCESS)
261 ct->ct_error.re_status = RPC_CANTENCODEARGS;
262 (void) xdrrec_endofrecord(xdrs, TRUE);
263 return (ct->ct_error.re_status);
265 if (!xdrrec_endofrecord(xdrs, shipnow))
266 return (ct->ct_error.re_status = RPC_CANTSEND);
268 return (RPC_SUCCESS);
270 * Hack to provide rpc-based message passing
272 if (timeout.tv_sec == 0 && timeout.tv_usec == 0) {
273 return (ct->ct_error.re_status = RPC_TIMEDOUT);
278 * Keep receiving until we get a valid transaction id
280 xdrs->x_op = XDR_DECODE;
282 reply_msg.acpted_rply.ar_verf = _null_auth;
283 reply_msg.acpted_rply.ar_results.where = NULL;
284 reply_msg.acpted_rply.ar_results.proc = (xdrproc_t) xdr_void;
285 if (!xdrrec_skiprecord(xdrs))
286 return (ct->ct_error.re_status);
287 /* now decode and validate the response header */
288 if (!xdr_replymsg(xdrs, &reply_msg)) {
289 if (ct->ct_error.re_status == RPC_SUCCESS)
291 return (ct->ct_error.re_status);
293 if (reply_msg.rm_xid == x_id)
300 _seterr_reply(&reply_msg, &(ct->ct_error));
301 if (ct->ct_error.re_status == RPC_SUCCESS) {
302 if (!AUTH_VALIDATE(h->cl_auth, &reply_msg.acpted_rply.ar_verf)) {
303 ct->ct_error.re_status = RPC_AUTHERROR;
304 ct->ct_error.re_why = AUTH_INVALIDRESP;
305 } else if (!(*xdr_results) (xdrs, results_ptr)) {
306 if (ct->ct_error.re_status == RPC_SUCCESS)
307 ct->ct_error.re_status = RPC_CANTDECODERES;
309 /* free verifier ... */
310 if (reply_msg.acpted_rply.ar_verf.oa_base != NULL) {
311 xdrs->x_op = XDR_FREE;
312 (void) xdr_opaque_auth(xdrs, &(reply_msg.acpted_rply.ar_verf));
314 } /* end successful completion */
316 /* maybe our credentials need to be refreshed ... */
317 if (refreshes-- && AUTH_REFRESH(h->cl_auth))
319 } /* end of unsuccessful completion */
320 return (ct->ct_error.re_status);
323 static void clnttcp_geterr(h, errp)
325 struct rpc_err *errp;
327 register struct ct_data *ct = (struct ct_data *) h->cl_private;
329 *errp = ct->ct_error;
332 static bool_t clnttcp_freeres(cl, xdr_res, res_ptr)
337 register struct ct_data *ct = (struct ct_data *) cl->cl_private;
338 register XDR *xdrs = &(ct->ct_xdrs);
340 xdrs->x_op = XDR_FREE;
341 return ((*xdr_res) (xdrs, res_ptr));
344 static void clnttcp_abort()
348 static bool_t clnttcp_control(cl, request, info)
353 register struct ct_data *ct = (struct ct_data *) cl->cl_private;
357 ct->ct_wait = *(struct timeval *) info;
358 ct->ct_waitset = TRUE;
361 *(struct timeval *) info = ct->ct_wait;
363 case CLGET_SERVER_ADDR:
364 *(struct sockaddr_in *) info = ct->ct_addr;
373 static void clnttcp_destroy(h)
376 register struct ct_data *ct = (struct ct_data *) h->cl_private;
378 if (ct->ct_closeit) {
379 (void) close(ct->ct_sock);
381 XDR_DESTROY(&(ct->ct_xdrs));
382 mem_free((caddr_t) ct, sizeof(struct ct_data));
384 mem_free((caddr_t) h, sizeof(CLIENT));
388 * Interface between xdr serializer and tcp connection.
389 * Behaves like the system calls, read & write, but keeps some error state
390 * around for the rpc level.
392 static int readtcp(ct, buf, len)
393 register struct ct_data *ct;
404 FD_SET(ct->ct_sock, &mask);
406 register int mask = 1 << (ct->ct_sock);
412 #endif /* def FD_SETSIZE */
416 (_rpc_dtablesize(), &readfds, NULL, NULL,
419 ct->ct_error.re_status = RPC_TIMEDOUT;
425 ct->ct_error.re_status = RPC_CANTRECV;
426 ct->ct_error.re_errno = errno;
431 switch (len = read(ct->ct_sock, buf, len)) {
435 ct->ct_error.re_errno = ECONNRESET;
436 ct->ct_error.re_status = RPC_CANTRECV;
437 len = -1; /* it's really an error */
441 ct->ct_error.re_errno = errno;
442 ct->ct_error.re_status = RPC_CANTRECV;
448 static int writetcp(ct, buf, len)
455 for (cnt = len; cnt > 0; cnt -= i, buf += i) {
456 if ((i = write(ct->ct_sock, buf, cnt)) == -1) {
457 ct->ct_error.re_errno = errno;
458 ct->ct_error.re_status = RPC_CANTSEND;