clnt_tcp.c /* @(#)clnt_tcp.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_tcp.c 1.37 87/10/05 Copyr 1984 Sun Micro"; #endif /* * clnt_tcp.c, Implements a TCP/IP based, client side RPC. * * Copyright (C) 1984, Sun Microsystems, Inc. * * TCP based RPC supports 'batched calls'. * A sequence of calls may be batched-up in a send buffer. The rpc call * return immediately to the client even though the call was not necessarily * sent. The batching occurs if the results' xdr routine is NULL (0) AND * the rpc timeout value is zero (see clnt.h, rpc). * * Clients should NOT casually batch calls that in fact return results; that is, * the server side should be aware that a call is batched and not produce any * return message. Batched calls that produce many result messages can * deadlock (netlock) the client and the server.... * * Now go hang yourself. */ #include <stdio.h> #include <rpc/rpc.h> #include <sys/socket.h> #include <netdb.h> #include <errno.h> #include <rpc/pmap_clnt.h> #include <unistd.h> #ifdef __STDC__ #include <stdlib.h> #endif #define MCALL_MSG_SIZE 24 #if NLS #include "nl_types.h" #endif static int readtcp(); static int writetcp(); static enum clnt_stat clnttcp_call(); static void clnttcp_abort(); static void clnttcp_geterr(); static bool_t clnttcp_freeres(); static bool_t clnttcp_control(); static void clnttcp_destroy(); static struct clnt_ops tcp_ops = { clnttcp_call, clnttcp_abort, clnttcp_geterr, clnttcp_freeres, clnttcp_destroy, clnttcp_control }; struct ct_data { int ct_sock; bool_t ct_closeit; struct timeval ct_wait; bool_t ct_waitset; /* wait set by clnt_control? */ struct sockaddr_in ct_addr; struct rpc_err ct_error; char ct_mcall[MCALL_MSG_SIZE]; /* marshalled callmsg */ u_int ct_mpos; /* pos after marshal */ XDR ct_xdrs; }; /* * Create a client handle for a tcp/ip connection. * If *sockp<0, *sockp is set to a newly created TCP socket and it is * connected to raddr. If *sockp non-negative then * raddr is ignored. The rpc/tcp package does buffering * similar to stdio, so the client must pick send and receive buffer sizes,]; * 0 => use the default. * If raddr->sin_port is 0, then a binder on the remote machine is * consulted for the right port number. * NB: *sockp is copied into a private area. * NB: It is the clients responsibility to close *sockp. * NB: The rpch->cl_auth is set null authentication. Caller may wish to set this * something more useful. */ CLIENT * clnttcp_create(raddr, prog, vers, sockp, sendsz, recvsz) struct sockaddr_in *raddr; u_long prog; u_long vers; register int *sockp; u_int sendsz; u_int recvsz; { CLIENT *h; register struct ct_data *ct = NULL; struct timeval now; struct rpc_msg call_msg; #if NLS libc_nls_init(); #endif h = (CLIENT *)mem_alloc(sizeof(*h)); if (h == NULL) { #if NLS (void)fprintf(stderr, "clnttcp_create: %s\n", catgets(_libc_cat, RpcMiscSet, RpcMiscOutOfMemory, "out of memory")); #else (void)fprintf(stderr, "clnttcp_create: out of memory\n"); #endif rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; goto fooy; } ct = (struct ct_data *)mem_alloc(sizeof(*ct)); if (ct == NULL) { #if NLS (void)fprintf(stderr, "clnttcp_create: %s\n", catgets(_libc_cat, RpcMiscSet, RpcMiscOutOfMemory, "out of memory")); #else (void)fprintf(stderr, "clnttcp_create: out of memory\n"); #endif rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; goto fooy; } /* * If no port number given ask the pmap for one */ if (raddr->sin_port == 0) { u_short port; if ((port = pmap_getport(raddr, prog, vers, IPPROTO_TCP)) == 0) { mem_free((caddr_t)ct, sizeof(struct ct_data)); mem_free((caddr_t)h, sizeof(CLIENT)); return ((CLIENT *)NULL); } raddr->sin_port = htons(port); } /* * If no socket given, open one */ if (*sockp < 0) { *sockp = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP); (void)bindresvport(*sockp, (struct sockaddr_in *)0); if ((*sockp < 0) || (connect(*sockp, (struct sockaddr *)raddr, sizeof(*raddr)) < 0)) { rpc_createerr.cf_stat = RPC_SYSTEMERROR; rpc_createerr.cf_error.re_errno = errno; if (*sockp >= 0) (void)close(*sockp); goto fooy; } ct->ct_closeit = TRUE; } else { ct->ct_closeit = FALSE; } /* * Set up private data struct */ ct->ct_sock = *sockp; ct->ct_wait.tv_usec = 0; ct->ct_waitset = FALSE; ct->ct_addr = *raddr; /* * Initialize call message */ (void)gettimeofday(&now, (struct timezone *)0); 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 = prog; call_msg.rm_call.cb_vers = vers; /* * pre-serialize the staic part of the call msg and stash it away */ xdrmem_create(&(ct->ct_xdrs), ct->ct_mcall, MCALL_MSG_SIZE, XDR_ENCODE); if (! xdr_callhdr(&(ct->ct_xdrs), &call_msg)) { if (ct->ct_closeit) { (void)close(*sockp); } goto fooy; } ct->ct_mpos = XDR_GETPOS(&(ct->ct_xdrs)); XDR_DESTROY(&(ct->ct_xdrs)); /* * Create a client handle which uses xdrrec for serialization * and authnone for authentication. */ xdrrec_create(&(ct->ct_xdrs), sendsz, recvsz, (caddr_t)ct, readtcp, writetcp); h->cl_ops = &tcp_ops; h->cl_private = (caddr_t) ct; h->cl_auth = authnone_create(); return (h); fooy: /* * Something goofed, free stuff and barf */ mem_free((caddr_t)ct, sizeof(struct ct_data)); mem_free((caddr_t)h, sizeof(CLIENT)); return ((CLIENT *)NULL); } static enum clnt_stat clnttcp_call(h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout) register CLIENT *h; u_long proc; xdrproc_t xdr_args; caddr_t args_ptr; xdrproc_t xdr_results; caddr_t results_ptr; struct timeval timeout; { register struct ct_data *ct = (struct ct_data *) h->cl_private; register XDR *xdrs = &(ct->ct_xdrs); struct rpc_msg reply_msg; u_long x_id; u_long *msg_x_id = (u_long *)(ct->ct_mcall); /* yuk */ register bool_t shipnow; int refreshes = 2; if (!ct->ct_waitset) { ct->ct_wait = timeout; } shipnow = (xdr_results == (xdrproc_t)0 && timeout.tv_sec == 0 && timeout.tv_usec == 0) ? FALSE : TRUE; call_again: xdrs->x_op = XDR_ENCODE; ct->ct_error.re_status = RPC_SUCCESS; x_id = ntohl(--(*msg_x_id)); if ((! XDR_PUTBYTES(xdrs, ct->ct_mcall, ct->ct_mpos)) || (! XDR_PUTLONG(xdrs, (long *)&proc)) || (! AUTH_MARSHALL(h->cl_auth, xdrs)) || (! (*xdr_args)(xdrs, args_ptr))) { if (ct->ct_error.re_status == RPC_SUCCESS) ct->ct_error.re_status = RPC_CANTENCODEARGS; (void)xdrrec_endofrecord(xdrs, TRUE); return (ct->ct_error.re_status); } if (! xdrrec_endofrecord(xdrs, shipnow)) return (ct->ct_error.re_status = RPC_CANTSEND); if (! shipnow) return (RPC_SUCCESS); /* * Hack to provide rpc-based message passing */ if (timeout.tv_sec == 0 && timeout.tv_usec == 0) { return(ct->ct_error.re_status = RPC_TIMEDOUT); } /* * Keep receiving until we get a valid transaction id */ xdrs->x_op = XDR_DECODE; while (TRUE) { reply_msg.acpted_rply.ar_verf = _null_auth; reply_msg.acpted_rply.ar_results.where = NULL; reply_msg.acpted_rply.ar_results.proc = xdr_void; if (! xdrrec_skiprecord(xdrs)) return (ct->ct_error.re_status); /* now decode and validate the response header */ if (! xdr_replymsg(xdrs, &reply_msg)) { if (ct->ct_error.re_status == RPC_SUCCESS) continue; return (ct->ct_error.re_status); } if (reply_msg.rm_xid == x_id) break; } /* * process header */ _seterr_reply(&reply_msg, &(ct->ct_error)); if (ct->ct_error.re_status == RPC_SUCCESS) { if (! AUTH_VALIDATE(h->cl_auth, &reply_msg.acpted_rply.ar_verf)) { ct->ct_error.re_status = RPC_AUTHERROR; ct->ct_error.re_why = AUTH_INVALIDRESP; } else if (! (*xdr_results)(xdrs, results_ptr)) { if (ct->ct_error.re_status == RPC_SUCCESS) ct->ct_error.re_status = RPC_CANTDECODERES; } /* free verifier ... */ 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 (refreshes-- && AUTH_REFRESH(h->cl_auth)) goto call_again; } /* end of unsuccessful completion */ return (ct->ct_error.re_status); } static void clnttcp_geterr(h, errp) CLIENT *h; struct rpc_err *errp; { register struct ct_data *ct = (struct ct_data *) h->cl_private; *errp = ct->ct_error; } static bool_t clnttcp_freeres(cl, xdr_res, res_ptr) CLIENT *cl; xdrproc_t xdr_res; caddr_t res_ptr; { register struct ct_data *ct = (struct ct_data *)cl->cl_private; register XDR *xdrs = &(ct->ct_xdrs); xdrs->x_op = XDR_FREE; return ((*xdr_res)(xdrs, res_ptr)); } static void clnttcp_abort() { } static bool_t clnttcp_control(cl, request, info) CLIENT *cl; int request; char *info; { register struct ct_data *ct = (struct ct_data *)cl->cl_private; switch (request) { case CLSET_TIMEOUT: ct->ct_wait = *(struct timeval *)info; ct->ct_waitset = TRUE; break; case CLGET_TIMEOUT: *(struct timeval *)info = ct->ct_wait; break; case CLGET_SERVER_ADDR: *(struct sockaddr_in *)info = ct->ct_addr; break; default: return (FALSE); } return (TRUE); } static void clnttcp_destroy(h) CLIENT *h; { register struct ct_data *ct = (struct ct_data *) h->cl_private; if (ct->ct_closeit) { (void)close(ct->ct_sock); } XDR_DESTROY(&(ct->ct_xdrs)); mem_free((caddr_t)ct, sizeof(struct ct_data)); mem_free((caddr_t)h, sizeof(CLIENT)); } /* * Interface between xdr serializer and tcp connection. * Behaves like the system calls, read & write, but keeps some error state * around for the rpc level. */ static int readtcp(ct, buf, len) register struct ct_data *ct; caddr_t buf; register int len; { #ifdef FD_SETSIZE fd_set mask; fd_set readfds; if (len == 0) return (0); FD_ZERO(&mask); FD_SET(ct->ct_sock, &mask); #else register int mask = 1 << (ct->ct_sock); int readfds; if (len == 0) return (0); #endif /* def FD_SETSIZE */ while (TRUE) { #ifdef linux struct timeval timeout; readfds = mask; timeout = ct->ct_wait; switch (select(_rpc_dtablesize(), &readfds, (void*)NULL, (void*)NULL, &timeout)) { #else readfds = mask; switch (select(_rpc_dtablesize(), &readfds, (void*)NULL, (void*)NULL, &(ct->ct_wait))) { #endif case 0: ct->ct_error.re_status = RPC_TIMEDOUT; return (-1); case -1: if (errno == EINTR) continue; ct->ct_error.re_status = RPC_CANTRECV; ct->ct_error.re_errno = errno; return (-1); } break; } switch (len = read(ct->ct_sock, buf, len)) { case 0: /* premature eof */ ct->ct_error.re_errno = ECONNRESET; ct->ct_error.re_status = RPC_CANTRECV; len = -1; /* it's really an error */ break; case -1: ct->ct_error.re_errno = errno; ct->ct_error.re_status = RPC_CANTRECV; break; } return (len); } static int writetcp(ct, buf, len) struct ct_data *ct; caddr_t buf; int len; { register int i, cnt; for (cnt = len; cnt > 0; cnt -= i, buf += i) { if ((i = write(ct->ct_sock, buf, cnt)) == -1) { ct->ct_error.re_errno = errno; ct->ct_error.re_status = RPC_CANTSEND; return (-1); } } return (len); }