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-rw-r--r--sunrpc/svc_unix.c496
1 files changed, 496 insertions, 0 deletions
diff --git a/sunrpc/svc_unix.c b/sunrpc/svc_unix.c
new file mode 100644
index 0000000000..59ae7a54e7
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+++ b/sunrpc/svc_unix.c
@@ -0,0 +1,496 @@
+/*
+ * 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
+ */
+
+/*
+ * svc_unix.c, Server side for TCP/IP based RPC.
+ *
+ * Copyright (C) 1984, Sun Microsystems, Inc.
+ *
+ * Actually implements two flavors of transporter -
+ * a unix rendezvouser (a listener and connection establisher)
+ * and a record/unix stream.
+ */
+
+#include <stdio.h>
+#include <unistd.h>
+#include <string.h>
+#include <rpc/rpc.h>
+#include <sys/socket.h>
+#include <sys/uio.h>
+#include <errno.h>
+#include <stdlib.h>
+
+/*
+ * Ops vector for AF_UNIX based rpc service handle
+ */
+static bool_t svcunix_recv (SVCXPRT *, struct rpc_msg *);
+static enum xprt_stat svcunix_stat (SVCXPRT *);
+static bool_t svcunix_getargs (SVCXPRT *, xdrproc_t, caddr_t);
+static bool_t svcunix_reply (SVCXPRT *, struct rpc_msg *);
+static bool_t svcunix_freeargs (SVCXPRT *, xdrproc_t, caddr_t);
+static void svcunix_destroy (SVCXPRT *);
+
+static const struct xp_ops svcunix_op =
+{
+  svcunix_recv,
+  svcunix_stat,
+  svcunix_getargs,
+  svcunix_reply,
+  svcunix_freeargs,
+  svcunix_destroy
+};
+
+/*
+ * Ops vector for AF_UNIX rendezvous handler
+ */
+static bool_t rendezvous_request (SVCXPRT *, struct rpc_msg *);
+static enum xprt_stat rendezvous_stat (SVCXPRT *);
+
+static const struct xp_ops svcunix_rendezvous_op =
+{
+  rendezvous_request,
+  rendezvous_stat,
+  (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
+  (bool_t (*) (SVCXPRT *, struct rpc_msg *)) abort,
+  (bool_t (*) (SVCXPRT *, xdrproc_t, caddr_t)) abort,
+  svcunix_destroy
+};
+
+static int readunix (char*, char *, int);
+static int writeunix (char *, char *, int);
+static SVCXPRT *makefd_xprt (int, u_int, u_int) internal_function;
+
+struct unix_rendezvous {        /* kept in xprt->xp_p1 */
+  u_int sendsize;
+  u_int recvsize;
+};
+
+struct unix_conn {		/* kept in xprt->xp_p1 */
+  enum xprt_stat strm_stat;
+  u_long x_id;
+  XDR xdrs;
+  char verf_body[MAX_AUTH_BYTES];
+};
+
+/*
+ * Usage:
+ *      xprt = svcunix_create(sock, send_buf_size, recv_buf_size);
+ *
+ * Creates, registers, and returns a (rpc) unix based transporter.
+ * Once *xprt is initialized, it is registered as a transporter
+ * see (svc.h, xprt_register).  This routine returns
+ * a NULL if a problem occurred.
+ *
+ * If sock<0 then a socket is created, else sock is used.
+ * If the socket, sock is not bound to a port then svcunix_create
+ * binds it to an arbitrary port.  The routine then starts a unix
+ * listener on the socket's associated port.  In any (successful) case,
+ * xprt->xp_sock is the registered socket number and xprt->xp_port is the
+ * associated port number.
+ *
+ * Since unix streams do buffered io similar to stdio, the caller can specify
+ * how big the send and receive buffers are via the second and third parms;
+ * 0 => use the system default.
+ */
+SVCXPRT *
+svcunix_create (int sock, u_int sendsize, u_int recvsize, char *path)
+{
+  bool_t madesock = FALSE;
+  SVCXPRT *xprt;
+  struct unix_rendezvous *r;
+  struct sockaddr_un addr;
+  socklen_t len = sizeof (struct sockaddr_in);
+
+  if (sock == RPC_ANYSOCK)
+    {
+      if ((sock = __socket (AF_UNIX, SOCK_STREAM, 0)) < 0)
+	{
+	  perror (_("svc_unix.c - AF_UNIX socket creation problem"));
+	  return (SVCXPRT *) NULL;
+	}
+      madesock = TRUE;
+    }
+  memset (&addr, '\0', sizeof (addr));
+  addr.sun_family = AF_UNIX;
+  len = strlen (addr.sun_path) + 1;
+  memcpy (addr.sun_path, path, len);
+  len += sizeof (addr.sun_family);
+
+  bind (sock, (struct sockaddr *) &addr, len);
+
+  if (getsockname (sock, (struct sockaddr *) &addr, &len) != 0
+      || listen (sock, 2) != 0)
+    {
+      perror (_("svc_unix.c - cannot getsockname or listen"));
+      if (madesock)
+	__close (sock);
+      return (SVCXPRT *) NULL;
+    }
+
+  r = (struct unix_rendezvous *) mem_alloc (sizeof (*r));
+  if (r == NULL)
+    {
+      fputs (_("svcunix_create: out of memory\n"), stderr);
+      return NULL;
+    }
+  r->sendsize = sendsize;
+  r->recvsize = recvsize;
+  xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
+  if (xprt == NULL)
+    {
+      fputs (_("svcunix_create: out of memory\n"), stderr);
+      return NULL;
+    }
+  xprt->xp_p2 = NULL;
+  xprt->xp_p1 = (caddr_t) r;
+  xprt->xp_verf = _null_auth;
+  xprt->xp_ops = &svcunix_rendezvous_op;
+  xprt->xp_port = -1;
+  xprt->xp_sock = sock;
+  xprt_register (xprt);
+  return xprt;
+}
+
+/*
+ * Like svunix_create(), except the routine takes any *open* UNIX file
+ * descriptor as its first input.
+ */
+SVCXPRT *
+svcunixfd_create (int fd, u_int sendsize, u_int recvsize)
+{
+  return makefd_xprt (fd, sendsize, recvsize);
+}
+
+static SVCXPRT *
+internal_function
+makefd_xprt (int fd, u_int sendsize, u_int recvsize)
+{
+  SVCXPRT *xprt;
+  struct unix_conn *cd;
+
+  xprt = (SVCXPRT *) mem_alloc (sizeof (SVCXPRT));
+  if (xprt == (SVCXPRT *) NULL)
+    {
+      (void) fputs (_("svc_unix: makefd_xprt: out of memory\n"), stderr);
+      goto done;
+    }
+  cd = (struct unix_conn *) mem_alloc (sizeof (struct unix_conn));
+  if (cd == (struct unix_conn *) NULL)
+    {
+      (void) fputs (_("svc_unix: makefd_xprt: out of memory\n"), stderr);
+      mem_free ((char *) xprt, sizeof (SVCXPRT));
+      xprt = (SVCXPRT *) NULL;
+      goto done;
+    }
+  cd->strm_stat = XPRT_IDLE;
+  xdrrec_create (&(cd->xdrs), sendsize, recvsize,
+		 (caddr_t) xprt, readunix, writeunix);
+  xprt->xp_p2 = NULL;
+  xprt->xp_p1 = (caddr_t) cd;
+  xprt->xp_verf.oa_base = cd->verf_body;
+  xprt->xp_addrlen = 0;
+  xprt->xp_ops = &svcunix_op;	/* truly deals with calls */
+  xprt->xp_port = 0;		/* this is a connection, not a rendezvouser */
+  xprt->xp_sock = fd;
+  xprt_register (xprt);
+done:
+  return xprt;
+}
+
+static bool_t
+rendezvous_request (SVCXPRT *xprt, struct rpc_msg *errmsg)
+{
+  int sock;
+  struct unix_rendezvous *r;
+  struct sockaddr_un addr;
+  struct sockaddr_in in_addr;
+  socklen_t len;
+
+  r = (struct unix_rendezvous *) xprt->xp_p1;
+again:
+  len = sizeof (struct sockaddr_un);
+  if ((sock = accept (xprt->xp_sock, (struct sockaddr *) &addr, &len)) < 0)
+    {
+      if (errno == EINTR)
+	goto again;
+      return FALSE;
+    }
+  /*
+   * make a new transporter (re-uses xprt)
+   */
+  memset (&in_addr, '\0', sizeof (in_addr));
+  in_addr.sin_family = AF_UNIX;
+  xprt = makefd_xprt (sock, r->sendsize, r->recvsize);
+  xprt->xp_raddr = in_addr;
+  xprt->xp_addrlen = len;
+  return FALSE;		/* there is never an rpc msg to be processed */
+}
+
+static enum xprt_stat
+rendezvous_stat (SVCXPRT *xprt)
+{
+  return XPRT_IDLE;
+}
+
+static void
+svcunix_destroy (SVCXPRT *xprt)
+{
+  struct unix_conn *cd = (struct unix_conn *) xprt->xp_p1;
+
+  xprt_unregister (xprt);
+  __close (xprt->xp_sock);
+  if (xprt->xp_port != 0)
+    {
+      /* a rendezvouser socket */
+      xprt->xp_port = 0;
+    }
+  else
+    {
+      /* an actual connection socket */
+      XDR_DESTROY (&(cd->xdrs));
+    }
+  mem_free ((caddr_t) cd, sizeof (struct unix_conn));
+  mem_free ((caddr_t) xprt, sizeof (SVCXPRT));
+}
+
+struct cmessage {
+  struct cmsghdr cmsg;
+  struct cmsgcred cmcred;
+};
+
+/* XXX This is not thread safe, but since the main functions in svc.c
+   and the rpcgen generated *_svc functions for the daemon are also not
+   thread safe and uses static global variables, it doesn't matter. */
+static struct cmessage cm;
+
+static int
+__msgread (int sock, void *buf, size_t cnt)
+{
+  struct iovec iov[1];
+  struct msghdr msg;
+  int len, 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;
+  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 we really should use gete?id(), or get?id().
+     It would be much better, if the kernel could pass both to the
+     client. */
+  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
+}
+
+/*
+ * All read operations timeout after 35 seconds.
+ * A timeout is fatal for the connection.
+ */
+static struct timeval wait_per_try = {35, 0};
+
+/*
+ * reads data from the unix connection.
+ * any error is fatal and the connection is closed.
+ * (And a read of zero bytes is a half closed stream => error.)
+ */
+static int
+readunix (char *xprtptr, char *buf, int len)
+{
+  SVCXPRT *xprt = (SVCXPRT *) xprtptr;
+  int sock = xprt->xp_sock;
+#ifdef FD_SETSIZE
+  fd_set readfds;
+#else
+  int mask = 1 << sock;
+  int readfds;
+#endif /* def FD_SETSIZE */
+  while (1)
+    {
+      struct timeval timeout = wait_per_try;
+      readfds = svc_fdset;
+#ifdef FD_SETSIZE
+      FD_SET (sock, &readfds);
+#else
+      readfds |= (1 << sock);
+#endif /* def FD_SETSIZE */
+      if (__select (_rpc_dtablesize (), &readfds, (fd_set *) NULL,
+		    (fd_set *) NULL, &timeout) <= 0)
+	{
+	  if (errno == EINTR)
+	    continue;
+	  goto fatal_err;
+	}
+
+#ifdef FD_SETSIZE
+      if (FD_ISSET (sock, &readfds))
+#else
+      if (readfds == mask)
+#endif /* def FD_SETSIZE */
+	break;
+
+      svc_getreqset (&readfds);
+    }
+
+  if ((len = __msgread (sock, buf, len)) > 0)
+    return len;
+
+ fatal_err:
+  ((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
+  return -1;
+}
+
+/*
+ * writes data to the unix connection.
+ * Any error is fatal and the connection is closed.
+ */
+static int
+writeunix (char *xprtptr, char * buf, int len)
+{
+  SVCXPRT *xprt = (SVCXPRT *) xprtptr;
+  int i, cnt;
+
+  for (cnt = len; cnt > 0; cnt -= i, buf += i)
+    {
+      if ((i = __msgwrite (xprt->xp_sock, buf, cnt)) < 0)
+	{
+	  ((struct unix_conn *) (xprt->xp_p1))->strm_stat = XPRT_DIED;
+	  return -1;
+	}
+    }
+  return len;
+}
+
+static enum xprt_stat
+svcunix_stat (SVCXPRT *xprt)
+{
+  struct unix_conn *cd =
+  (struct unix_conn *) (xprt->xp_p1);
+
+  if (cd->strm_stat == XPRT_DIED)
+    return XPRT_DIED;
+  if (!xdrrec_eof (&(cd->xdrs)))
+    return XPRT_MOREREQS;
+  return XPRT_IDLE;
+}
+
+static bool_t
+svcunix_recv (SVCXPRT *xprt, struct rpc_msg *msg)
+{
+  struct unix_conn *cd = (struct unix_conn *) (xprt->xp_p1);
+  XDR *xdrs = &(cd->xdrs);
+
+  xdrs->x_op = XDR_DECODE;
+  xdrrec_skiprecord (xdrs);
+  if (xdr_callmsg (xdrs, msg))
+    {
+      cd->x_id = msg->rm_xid;
+      /* set up verifiers */
+      msg->rm_call.cb_verf.oa_flavor = AUTH_UNIX;
+      msg->rm_call.cb_verf.oa_base = (caddr_t) &cm;
+      msg->rm_call.cb_verf.oa_length = sizeof (cm);
+      return TRUE;
+    }
+  cd->strm_stat = XPRT_DIED;	/* XXXX */
+  return FALSE;
+}
+
+static bool_t
+svcunix_getargs (SVCXPRT *xprt, xdrproc_t xdr_args, caddr_t args_ptr)
+{
+  return (*xdr_args) (&(((struct unix_conn *) (xprt->xp_p1))->xdrs),
+		      args_ptr);
+}
+
+static bool_t
+svcunix_freeargs (xprt, xdr_args, args_ptr)
+     SVCXPRT *xprt;
+     xdrproc_t xdr_args;
+     caddr_t args_ptr;
+{
+  XDR *xdrs = &(((struct unix_conn *) (xprt->xp_p1))->xdrs);
+
+  xdrs->x_op = XDR_FREE;
+  return (*xdr_args) (xdrs, args_ptr);
+}
+
+static bool_t
+svcunix_reply (xprt, msg)
+     SVCXPRT *xprt;
+     struct rpc_msg *msg;
+{
+  struct unix_conn *cd = (struct unix_conn *) (xprt->xp_p1);
+  XDR *xdrs = &(cd->xdrs);
+  bool_t stat;
+
+  xdrs->x_op = XDR_ENCODE;
+  msg->rm_xid = cd->x_id;
+  stat = xdr_replymsg (xdrs, msg);
+  (void) xdrrec_endofrecord (xdrs, TRUE);
+  return stat;
+}
generated by cgit-pink 1.4.1 (git 2.36.1) at 2024-11-30 03:53:26 +0000