/* @(#)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 0 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 #include #include #include #include "rpc_private.h" #include #include #include #define MCALL_MSG_SIZE 24 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; }; static int readtcp (char *, char *, int); static int writetcp (char *, char *, int); static enum clnt_stat clnttcp_call (CLIENT *, u_long, xdrproc_t, caddr_t, xdrproc_t, caddr_t, struct timeval); static void clnttcp_abort (void); static void clnttcp_geterr (CLIENT *, struct rpc_err *); static bool_t clnttcp_freeres (CLIENT *, xdrproc_t, caddr_t); static bool_t clnttcp_control (CLIENT *, int, char *); static void clnttcp_destroy (CLIENT *); static const struct clnt_ops tcp_ops = { clnttcp_call, clnttcp_abort, clnttcp_geterr, clnttcp_freeres, clnttcp_destroy, clnttcp_control }; /* * 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 (struct sockaddr_in *raddr, u_long prog, u_long vers, int *sockp, u_int sendsz, u_int recvsz) { CLIENT *h; struct ct_data *ct; struct rpc_msg call_msg; h = (CLIENT *) mem_alloc (sizeof (*h)); ct = (struct ct_data *) mem_alloc (sizeof (*ct)); if (h == NULL || ct == NULL) { struct rpc_createerr *ce = &get_rpc_createerr (); (void) fputs (_("clnttcp_create: out of memory\n"), stderr); ce->cf_stat = RPC_SYSTEMERROR; ce->cf_error.re_errno = ENOMEM; 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)) { struct rpc_createerr *ce = &get_rpc_createerr (); ce->cf_stat = RPC_SYSTEMERROR; ce->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 */ call_msg.rm_xid = _create_xid (); 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 static 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); } libc_hidden_def(clnttcp_create) static enum clnt_stat clnttcp_call (CLIENT *h, u_long proc, xdrproc_t xdr_args, caddr_t args_ptr, xdrproc_t xdr_results, caddr_t results_ptr, struct timeval timeout) { struct ct_data *ct = (struct ct_data *) h->cl_private; XDR *xdrs = &(ct->ct_xdrs); struct rpc_msg reply_msg; u_long x_id; u_int32_t *msg_x_id = (u_int32_t *) (ct->ct_mcall); /* yuk */ bool_t shipnow; int refreshes = 2; if (!ct->ct_waitset) { ct->ct_wait = timeout; } shipnow = (xdr_results == (xdrproc_t) 0 && ct->ct_wait.tv_sec == 0 && ct->ct_wait.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 (ct->ct_wait.tv_sec == 0 && ct->ct_wait.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 = (xdrproc_t)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 ((u_int32_t) reply_msg.rm_xid == (u_int32_t) 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 (CLIENT *h, struct rpc_err *errp) { struct ct_data *ct = (struct ct_data *) h->cl_private; *errp = ct->ct_error; } static bool_t clnttcp_freeres (CLIENT *cl, xdrproc_t xdr_res, caddr_t res_ptr) { struct ct_data *ct = (struct ct_data *) cl->cl_private; XDR *xdrs = &(ct->ct_xdrs); xdrs->x_op = XDR_FREE; return (*xdr_res) (xdrs, res_ptr); } static void clnttcp_abort (void) { } static bool_t clnttcp_control (CLIENT *cl, int request, char *info) { struct ct_data *ct = (struct ct_data *) cl->cl_private; switch (request) { case CLSET_FD_CLOSE: ct->ct_closeit = TRUE; break; case CLSET_FD_NCLOSE: ct->ct_closeit = FALSE; break; 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; case CLGET_FD: *(int *)info = ct->ct_sock; break; case CLGET_XID: /* * use the knowledge that xid is the * first element in the call structure *. * This will get the xid of the PREVIOUS call */ *(u_long *)info = ntohl (*(u_long *)ct->ct_mcall); break; case CLSET_XID: /* This will set the xid of the NEXT call */ *(u_long *)ct->ct_mcall = htonl (*(u_long *)info - 1); /* decrement by 1 as clnttcp_call() increments once */ break; case CLGET_VERS: /* * This RELIES on the information that, in the call body, * the version number field is the fifth field from the * begining of the RPC header. MUST be changed if the * call_struct is changed */ *(u_long *)info = ntohl (*(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT)); break; case CLSET_VERS: *(u_long *)(ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT) = htonl (*(u_long *)info); break; case CLGET_PROG: /* * This RELIES on the information that, in the call body, * the program number field is the field from the * begining of the RPC header. MUST be changed if the * call_struct is changed */ *(u_long *)info = ntohl(*(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT)); break; case CLSET_PROG: *(u_long *)(ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT) = htonl(*(u_long *)info); break; /* The following are only possible with TI-RPC */ case CLGET_RETRY_TIMEOUT: case CLSET_RETRY_TIMEOUT: case CLGET_SVC_ADDR: case CLSET_SVC_ADDR: case CLSET_PUSH_TIMOD: case CLSET_POP_TIMOD: default: return FALSE; } return TRUE; } static void clnttcp_destroy (CLIENT *h) { 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 (char *ctptr, char *buf, int len) { struct ct_data *ct = (struct ct_data *)ctptr; struct pollfd fd; int milliseconds = (ct->ct_wait.tv_sec * 1000) + (ct->ct_wait.tv_usec / 1000); if (len == 0) return 0; fd.fd = ct->ct_sock; fd.events = POLLIN; while (TRUE) { switch (poll(&fd, 1, milliseconds)) { 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 (char *ctptr, char *buf, int len) { int i, cnt; struct ct_data *ct = (struct ct_data*)ctptr; 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; }