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glibc/sunrpc/clnt_tcp.c

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/*
* clnt_tcp.c, Implements a TCP/IP based, client side RPC.
*
* Copyright (c) 2010, Oracle America, Inc.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are
* met:
*
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above
* copyright notice, this list of conditions and the following
* disclaimer in the documentation and/or other materials
* provided with the distribution.
* * Neither the name of the "Oracle America, Inc." nor the names of its
* contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
* INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE
* GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
* NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*
* 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 <netdb.h>
#include <errno.h>
#include <stdio.h>
#include <unistd.h>
#include <libintl.h>
#include <rpc/rpc.h>
#include <sys/poll.h>
#include <sys/socket.h>
#include <rpc/pmap_clnt.h>
#include <wchar.h>
extern u_long _create_xid (void);
#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) __fxprintf (NULL, "%s: %s", __func__, _("out of memory\n"));
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 = (struct clnt_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);
}
#ifdef EXPORT_RPC_SYMBOLS
libc_hidden_def (clnttcp_create)
#else
libc_hidden_nolink_sunrpc (clnttcp_create, GLIBC_2_0)
#endif
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;
u_long ul;
u_int32_t ui32;
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
*/
memcpy (&ui32, ct->ct_mcall, sizeof (ui32));
ul = ntohl (ui32);
memcpy (info, &ul, sizeof (ul));
break;
case CLSET_XID:
/* This will set the xid of the NEXT call */
memcpy (&ul, info, sizeof (ul));
ui32 = htonl (ul - 1);
memcpy (ct->ct_mcall, &ui32, sizeof (ui32));
/* 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
* beginning of the RPC header. MUST be changed if the
* call_struct is changed
*/
memcpy (&ui32, ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT, sizeof (ui32));
ul = ntohl (ui32);
memcpy (info, &ul, sizeof (ul));
break;
case CLSET_VERS:
memcpy (&ul, info, sizeof (ul));
ui32 = htonl (ul);
memcpy (ct->ct_mcall + 4 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
break;
case CLGET_PROG:
/*
* This RELIES on the information that, in the call body,
* the program number field is the field from the
* beginning of the RPC header. MUST be changed if the
* call_struct is changed
*/
memcpy (&ui32, ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT, sizeof (ui32));
ul = ntohl (ui32);
memcpy (info, &ul, sizeof (ul));
break;
case CLSET_PROG:
memcpy (&ul, info, sizeof (ul));
ui32 = htonl (ul);
memcpy (ct->ct_mcall + 3 * BYTES_PER_XDR_UNIT, &ui32, sizeof (ui32));
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;
}
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