/* * xdr_mem.c, XDR implementation using memory buffers. * * 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. * * If you have some data to be interpreted as external data representation * or to be converted to external data representation in a memory buffer, * then this is the package for you. */ #include <string.h> #include <limits.h> #include <rpc/rpc.h> #include <shlib-compat.h> static bool_t xdrmem_getlong (XDR *, long *); static bool_t xdrmem_putlong (XDR *, const long *); static bool_t xdrmem_getbytes (XDR *, caddr_t, u_int); static bool_t xdrmem_putbytes (XDR *, const char *, u_int); static u_int xdrmem_getpos (const XDR *); static bool_t xdrmem_setpos (XDR *, u_int); static int32_t *xdrmem_inline (XDR *, u_int); static void xdrmem_destroy (XDR *); static bool_t xdrmem_getint32 (XDR *, int32_t *); static bool_t xdrmem_putint32 (XDR *, const int32_t *); static const struct xdr_ops xdrmem_ops = { xdrmem_getlong, xdrmem_putlong, xdrmem_getbytes, xdrmem_putbytes, xdrmem_getpos, xdrmem_setpos, xdrmem_inline, xdrmem_destroy, xdrmem_getint32, xdrmem_putint32 }; /* * The procedure xdrmem_create initializes a stream descriptor for a * memory buffer. */ void xdrmem_create (XDR *xdrs, const caddr_t addr, u_int size, enum xdr_op op) { xdrs->x_op = op; /* We have to add the const since the `struct xdr_ops' in `struct XDR' is not `const'. */ xdrs->x_ops = (struct xdr_ops *) &xdrmem_ops; xdrs->x_private = xdrs->x_base = addr; xdrs->x_handy = size; } #ifdef EXPORT_RPC_SYMBOLS libc_hidden_def (xdrmem_create) #else libc_hidden_nolink_sunrpc (xdrmem_create, GLIBC_2_0) #endif /* * Nothing needs to be done for the memory case. The argument is clearly * const. */ static void xdrmem_destroy (XDR *xdrs) { } /* * Gets the next word from the memory referenced by xdrs and places it * in the long pointed to by lp. It then increments the private word to * point at the next element. Neither object pointed to is const */ static bool_t xdrmem_getlong (XDR *xdrs, long *lp) { if (xdrs->x_handy < 4) return FALSE; xdrs->x_handy -= 4; *lp = (int32_t) ntohl ((*((int32_t *) (xdrs->x_private)))); xdrs->x_private += 4; return TRUE; } /* * Puts the long pointed to by lp in the memory referenced by xdrs. It * then increments the private word to point at the next element. The * long pointed at is const */ static bool_t xdrmem_putlong (XDR *xdrs, const long *lp) { if (xdrs->x_handy < 4) return FALSE; xdrs->x_handy -= 4; *(int32_t *) xdrs->x_private = htonl (*lp); xdrs->x_private += 4; return TRUE; } /* * Gets an unaligned number of bytes from the xdrs structure and writes them * to the address passed in addr. Be very careful when calling this routine * as it could leave the xdrs pointing to an unaligned structure which is not * a good idea. None of the things pointed to are const. */ static bool_t xdrmem_getbytes (XDR *xdrs, caddr_t addr, u_int len) { if (xdrs->x_handy < len) return FALSE; xdrs->x_handy -= len; memcpy (addr, xdrs->x_private, len); xdrs->x_private += len; return TRUE; } /* * The complementary function to the above. The same warnings apply about * unaligned data. The source address is const. */ static bool_t xdrmem_putbytes (XDR *xdrs, const char *addr, u_int len) { if (xdrs->x_handy < len) return FALSE; xdrs->x_handy -= len; memcpy (xdrs->x_private, addr, len); xdrs->x_private += len; return TRUE; } /* * Not sure what this one does. But it clearly doesn't modify the contents * of xdrs. **FIXME** does this not assume u_int == u_long? */ static u_int xdrmem_getpos (const XDR *xdrs) { return (u_long) xdrs->x_private - (u_long) xdrs->x_base; } /* * xdrs modified */ static bool_t xdrmem_setpos (XDR *xdrs, u_int pos) { caddr_t newaddr = xdrs->x_base + pos; caddr_t lastaddr = xdrs->x_private + xdrs->x_handy; size_t handy = lastaddr - newaddr; if (newaddr > lastaddr || newaddr < xdrs->x_base || handy != (u_int) handy) return FALSE; xdrs->x_private = newaddr; xdrs->x_handy = (u_int) handy; return TRUE; } /* * xdrs modified */ static int32_t * xdrmem_inline (XDR *xdrs, u_int len) { int32_t *buf = 0; if (xdrs->x_handy >= len) { xdrs->x_handy -= len; buf = (int32_t *) xdrs->x_private; xdrs->x_private += len; } return buf; } /* * Gets the next word from the memory referenced by xdrs and places it * in the int pointed to by ip. It then increments the private word to * point at the next element. Neither object pointed to is const */ static bool_t xdrmem_getint32 (XDR *xdrs, int32_t *ip) { if (xdrs->x_handy < 4) return FALSE; xdrs->x_handy -= 4; *ip = ntohl ((*((int32_t *) (xdrs->x_private)))); xdrs->x_private += 4; return TRUE; } /* * Puts the long pointed to by lp in the memory referenced by xdrs. It * then increments the private word to point at the next element. The * long pointed at is const */ static bool_t xdrmem_putint32 (XDR *xdrs, const int32_t *ip) { if (xdrs->x_handy < 4) return FALSE; xdrs->x_handy -= 4; *(int32_t *) xdrs->x_private = htonl (*ip); xdrs->x_private += 4; return TRUE; }