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-rw-r--r--sunrpc/clnt_unix.c573
1 files changed, 573 insertions, 0 deletions
diff --git a/sunrpc/clnt_unix.c b/sunrpc/clnt_unix.c
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+/*
+ * 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
+ */
+
+/*
+ * clnt_unix.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 <netdb.h>
+#include <errno.h>
+#include <stdio.h>
+#include <unistd.h>
+#include <rpc/rpc.h>
+#include <sys/uio.h>
+#include <sys/poll.h>
+#include <sys/socket.h>
+#include <rpc/pmap_clnt.h>
+
+#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_un 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 readunix (char *, char *, int);
+static int writeunix (char *, char *, int);
+
+static enum clnt_stat clntunix_call (CLIENT *, u_long, xdrproc_t, caddr_t,
+ xdrproc_t, caddr_t, struct timeval);
+static void clntunix_abort (void);
+static void clntunix_geterr (CLIENT *, struct rpc_err *);
+static bool_t clntunix_freeres (CLIENT *, xdrproc_t, caddr_t);
+static bool_t clntunix_control (CLIENT *, int, char *);
+static void clntunix_destroy (CLIENT *);
+
+static struct clnt_ops unix_ops =
+{
+ clntunix_call,
+ clntunix_abort,
+ clntunix_geterr,
+ clntunix_freeres,
+ clntunix_destroy,
+ clntunix_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 *
+clntunix_create (struct sockaddr_un *raddr, u_long prog, u_long vers,
+ int *sockp, u_int sendsz, u_int recvsz)
+{
+ CLIENT *h;
+ struct ct_data *ct = (struct ct_data *) mem_alloc (sizeof (*ct));
+ struct timeval now;
+ struct rpc_msg call_msg;
+ int len;
+
+ h = (CLIENT *) mem_alloc (sizeof (*h));
+ if (h == NULL)
+ {
+ (void) fputs (_("clntunix_create: out of memory\n"), stderr);
+ 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)
+ {
+ (void) fputs (_("clntunix_create: out of memory\n"), stderr);
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ goto fooy;
+ }
+
+ /*
+ * If no socket given, open one
+ */
+ if (*sockp < 0)
+ {
+ *sockp = __socket (AF_UNIX, SOCK_STREAM, 0);
+ len = strlen (raddr->sun_path) + sizeof (raddr->sun_family) + 1;
+ if (*sockp < 0
+ || __connect (*sockp, (struct sockaddr *) raddr, len) < 0)
+ {
+ rpc_createerr.cf_stat = RPC_SYSTEMERROR;
+ rpc_createerr.cf_error.re_errno = errno;
+ if (*sockp != -1)
+ __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
+ */
+ __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 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)
+ __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, readunix, writeunix);
+ h->cl_ops = &unix_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
+clntunix_call (h, proc, xdr_args, args_ptr, xdr_results, results_ptr, timeout)
+ 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 && 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 = (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 (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
+clntunix_geterr (CLIENT *h, struct rpc_err *errp)
+{
+ struct ct_data *ct = (struct ct_data *) h->cl_private;
+
+ *errp = ct->ct_error;
+}
+
+static bool_t
+clntunix_freeres (cl, xdr_res, res_ptr)
+ 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
+clntunix_abort ()
+{
+}
+
+static bool_t
+clntunix_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;
+ break;
+ case CLGET_TIMEOUT:
+ *(struct timeval *) info = ct->ct_wait;
+ break;
+ case CLGET_SERVER_ADDR:
+ *(struct sockaddr_un *) 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 clntunix_call() increments once */
+ 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
+clntunix_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));
+}
+
+struct cmessage {
+ struct cmsghdr cmsg;
+ struct cmsgcred cmcred;
+};
+
+static int
+__msgread (int sock, void *buf, size_t cnt)
+{
+ struct iovec iov[1];
+ struct msghdr msg;
+ struct cmessage cm;
+ int on = 1;
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = cnt;
+
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = (caddr_t)&cm;
+ msg.msg_controllen = sizeof(struct cmessage);
+ msg.msg_flags = 0;
+
+ setsockopt (sock, SOL_SOCKET, SO_PASSCRED, &on, sizeof (on));
+
+ return recvmsg (sock, &msg, 0);
+}
+
+static int
+__msgwrite (int sock, void *buf, size_t cnt)
+{
+#ifndef SCM_CRED
+ /* We cannot implement this reliably. */
+ __set_errno (ENOSYS);
+#else
+ struct iovec iov[1];
+ struct msghdr msg;
+ struct cmessage cm;
+ int len;
+
+ iov[0].iov_base = buf;
+ iov[0].iov_len = cnt;
+
+ cm.cmsg.cmsg_type = SCM_CREDS;
+ cm.cmsg.cmsg_level = SOL_SOCKET;
+ cm.cmsg.cmsg_len = sizeof (struct cmessage);
+ /* XXX I'm not sure, if gete?id() is always correct, or if we should use
+ get?id(). But since keyserv needs geteuid(), we have no other chance.
+ It would be much better, if the kernel could pass both to the server. */
+ cm.cmcred.cmcred_pid = __getpid ();
+ cm.cmcred.cmcred_uid = __geteuid ();
+ cm.cmcred.cmcred_gid = __getegid ();
+
+ msg.msg_iov = iov;
+ msg.msg_iovlen = 1;
+ msg.msg_name = NULL;
+ msg.msg_namelen = 0;
+ msg.msg_control = (caddr_t) &cm;
+ msg.msg_controllen = sizeof (struct cmessage);
+ msg.msg_flags = 0;
+
+ return sendmsg (sock, &msg, 0);
+#endif
+}
+
+
+/*
+ * Interface between xdr serializer and unix connection.
+ * Behaves like the system calls, read & write, but keeps some error state
+ * around for the rpc level.
+ */
+static int
+readunix (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 = __msgread (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
+writeunix (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 = __msgwrite (ct->ct_sock, buf, cnt)) == -1)
+ {
+ ct->ct_error.re_errno = errno;
+ ct->ct_error.re_status = RPC_CANTSEND;
+ return -1;
+ }
+ }
+ return len;
+}