[df49c60] | 1 | /* |
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| 2 | * Sun RPC is a product of Sun Microsystems, Inc. and is provided for |
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| 3 | * unrestricted use provided that this legend is included on all tape |
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| 4 | * media and as a part of the software program in whole or part. Users |
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| 5 | * may copy or modify Sun RPC without charge, but are not authorized |
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| 6 | * to license or distribute it to anyone else except as part of a product or |
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| 7 | * program developed by the user. |
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| 8 | * |
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| 9 | * SUN RPC IS PROVIDED AS IS WITH NO WARRANTIES OF ANY KIND INCLUDING THE |
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| 10 | * WARRANTIES OF DESIGN, MERCHANTIBILITY AND FITNESS FOR A PARTICULAR |
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| 11 | * PURPOSE, OR ARISING FROM A COURSE OF DEALING, USAGE OR TRADE PRACTICE. |
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| 12 | * |
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| 13 | * Sun RPC is provided with no support and without any obligation on the |
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| 14 | * part of Sun Microsystems, Inc. to assist in its use, correction, |
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| 15 | * modification or enhancement. |
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| 16 | * |
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| 17 | * SUN MICROSYSTEMS, INC. SHALL HAVE NO LIABILITY WITH RESPECT TO THE |
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| 18 | * INFRINGEMENT OF COPYRIGHTS, TRADE SECRETS OR ANY PATENTS BY SUN RPC |
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| 19 | * OR ANY PART THEREOF. |
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| 20 | * |
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| 21 | * In no event will Sun Microsystems, Inc. be liable for any lost revenue |
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| 22 | * or profits or other special, indirect and consequential damages, even if |
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| 23 | * Sun has been advised of the possibility of such damages. |
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| 24 | * |
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| 25 | * Sun Microsystems, Inc. |
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| 26 | * 2550 Garcia Avenue |
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| 27 | * Mountain View, California 94043 |
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| 28 | */ |
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| 29 | #if defined(LIBC_SCCS) && !defined(lint) |
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| 30 | /*static char *sccsid = "from: @(#)xdr_rec.c 1.21 87/08/11 Copyr 1984 Sun Micro";*/ |
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| 31 | /*static char *sccsid = "from: @(#)xdr_rec.c 2.2 88/08/01 4.0 RPCSRC";*/ |
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| 32 | static char *rcsid = "$FreeBSD: src/lib/libc/xdr/xdr_rec.c,v 1.12 2000/01/19 06:12:32 wpaul Exp $"; |
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| 33 | #endif |
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| 34 | |
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| 35 | /* |
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| 36 | * xdr_rec.c, Implements TCP/IP based XDR streams with a "record marking" |
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| 37 | * layer above tcp (for rpc's use). |
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| 38 | * |
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| 39 | * Copyright (C) 1984, Sun Microsystems, Inc. |
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| 40 | * |
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| 41 | * These routines interface XDRSTREAMS to a tcp/ip connection. |
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| 42 | * There is a record marking layer between the xdr stream |
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| 43 | * and the tcp transport level. A record is composed on one or more |
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| 44 | * record fragments. A record fragment is a thirty-two bit header followed |
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| 45 | * by n bytes of data, where n is contained in the header. The header |
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| 46 | * is represented as a htonl(u_long). Thegh order bit encodes |
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| 47 | * whether or not the fragment is the last fragment of the record |
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| 48 | * (1 => fragment is last, 0 => more fragments to follow. |
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| 49 | * The other 31 bits encode the byte length of the fragment. |
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| 50 | */ |
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| 51 | |
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| 52 | #include <stdio.h> |
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| 53 | #include <stdlib.h> |
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| 54 | #include <string.h> |
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| 55 | #include <rpc/types.h> |
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| 56 | #include <rpc/xdr.h> |
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| 57 | #include <netinet/in.h> |
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| 58 | #include <unistd.h> /* for lseek() */ |
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| 59 | |
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| 60 | static u_int fix_buf_size(); |
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| 61 | static bool_t flush_out(); |
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| 62 | static bool_t get_input_bytes(); |
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| 63 | static bool_t set_input_fragment(); |
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| 64 | static bool_t skip_input_bytes(); |
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| 65 | |
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| 66 | static bool_t xdrrec_getlong(); |
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| 67 | static bool_t xdrrec_putlong(); |
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| 68 | static bool_t xdrrec_getbytes(); |
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| 69 | static bool_t xdrrec_putbytes(); |
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| 70 | static u_int xdrrec_getpos(); |
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| 71 | static bool_t xdrrec_setpos(); |
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| 72 | static int32_t *xdrrec_inline(); |
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| 73 | static void xdrrec_destroy(); |
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| 74 | |
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| 75 | static struct xdr_ops xdrrec_ops = { |
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| 76 | xdrrec_getlong, |
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| 77 | xdrrec_putlong, |
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| 78 | xdrrec_getbytes, |
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| 79 | xdrrec_putbytes, |
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| 80 | xdrrec_getpos, |
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| 81 | xdrrec_setpos, |
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| 82 | xdrrec_inline, |
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| 83 | xdrrec_destroy |
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| 84 | }; |
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| 85 | |
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| 86 | /* |
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| 87 | * A record is composed of one or more record fragments. |
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| 88 | * A record fragment is a two-byte header followed by zero to |
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| 89 | * 2**32-1 bytes. The header is treated as a long unsigned and is |
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| 90 | * encode/decoded to the network via htonl/ntohl. The low order 31 bits |
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| 91 | * are a byte count of the fragment. The highest order bit is a boolean: |
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| 92 | * 1 => this fragment is the last fragment of the record, |
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| 93 | * 0 => this fragment is followed by more fragment(s). |
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| 94 | * |
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| 95 | * The fragment/record machinery is not general; it is constructed to |
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| 96 | * meet the needs of xdr and rpc based on tcp. |
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| 97 | */ |
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| 98 | |
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[cf04e8ac] | 99 | #define LAST_FRAG ((u_int32_t)(1L << 31)) |
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[df49c60] | 100 | |
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| 101 | typedef struct rec_strm { |
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| 102 | caddr_t tcp_handle; |
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| 103 | caddr_t the_buffer; |
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| 104 | /* |
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| 105 | * out-goung bits |
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| 106 | */ |
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[9f4040a] | 107 | int (*writeit) (caddr_t, caddr_t, int); |
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[df49c60] | 108 | caddr_t out_base; /* output buffer (points to frag header) */ |
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| 109 | caddr_t out_finger; /* next output position */ |
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| 110 | caddr_t out_boundry; /* data cannot up to this address */ |
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| 111 | u_int32_t *frag_header; /* beginning of current fragment */ |
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| 112 | bool_t frag_sent; /* true if buffer sent in middle of record */ |
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| 113 | /* |
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| 114 | * in-coming bits |
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| 115 | */ |
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[9f4040a] | 116 | int (*readit) (caddr_t, caddr_t, int); |
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[df49c60] | 117 | u_long in_size; /* fixed size of the input buffer */ |
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| 118 | caddr_t in_base; |
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| 119 | caddr_t in_finger; /* location of next byte to be had */ |
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| 120 | caddr_t in_boundry; /* can read up to this location */ |
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| 121 | long fbtbc; /* fragment bytes to be consumed */ |
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| 122 | bool_t last_frag; |
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| 123 | u_int sendsize; |
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| 124 | u_int recvsize; |
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| 125 | } RECSTREAM; |
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| 126 | |
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| 127 | |
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| 128 | /* |
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| 129 | * Create an xdr handle for xdrrec |
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| 130 | * xdrrec_create fills in xdrs. Sendsize and recvsize are |
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| 131 | * send and recv buffer sizes (0 => use default). |
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| 132 | * tcp_handle is an opaque handle that is passed as the first parameter to |
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| 133 | * the procedures readit and writeit. Readit and writeit are read and |
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| 134 | * write respectively. They are like the system |
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| 135 | * calls expect that they take an opaque handle rather than an fd. |
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| 136 | */ |
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| 137 | void |
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[9d1596d6] | 138 | xdrrec_create( |
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| 139 | XDR *xdrs, |
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| 140 | u_int sendsize, |
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| 141 | u_int recvsize, |
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| 142 | caddr_t tcp_handle, |
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| 143 | int (*readit)(char*, char*, int), /* like read, but pass it a tcp_handle, not sock */ |
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| 144 | int (*writeit)(char*, char*, int) /* like write, but pass it a tcp_handle, not sock */ |
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| 145 | ) |
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[df49c60] | 146 | { |
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| 147 | register RECSTREAM *rstrm = |
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| 148 | (RECSTREAM *)mem_alloc(sizeof(RECSTREAM)); |
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| 149 | |
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| 150 | if (rstrm == NULL) { |
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| 151 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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| 152 | /* |
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| 153 | * This is bad. Should rework xdrrec_create to |
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| 154 | * return a handle, and in this case return NULL |
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| 155 | */ |
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| 156 | return; |
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| 157 | } |
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| 158 | /* |
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| 159 | * adjust sizes and allocate buffer quad byte aligned |
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| 160 | */ |
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| 161 | rstrm->sendsize = sendsize = fix_buf_size(sendsize); |
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| 162 | rstrm->recvsize = recvsize = fix_buf_size(recvsize); |
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| 163 | rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT); |
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| 164 | if (rstrm->the_buffer == NULL) { |
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| 165 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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| 166 | return; |
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| 167 | } |
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| 168 | for (rstrm->out_base = rstrm->the_buffer; |
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[cf04e8ac] | 169 | (uintptr_t)rstrm->out_base % BYTES_PER_XDR_UNIT != 0; |
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[df49c60] | 170 | rstrm->out_base++); |
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| 171 | rstrm->in_base = rstrm->out_base + sendsize; |
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| 172 | /* |
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| 173 | * now the rest ... |
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| 174 | */ |
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| 175 | xdrs->x_ops = &xdrrec_ops; |
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| 176 | xdrs->x_private = (caddr_t)rstrm; |
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| 177 | rstrm->tcp_handle = tcp_handle; |
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| 178 | rstrm->readit = readit; |
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| 179 | rstrm->writeit = writeit; |
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| 180 | rstrm->out_finger = rstrm->out_boundry = rstrm->out_base; |
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| 181 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
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| 182 | rstrm->out_finger += sizeof(u_int32_t); |
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| 183 | rstrm->out_boundry += sendsize; |
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| 184 | rstrm->frag_sent = FALSE; |
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| 185 | rstrm->in_size = recvsize; |
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| 186 | rstrm->in_boundry = rstrm->in_base; |
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| 187 | rstrm->in_finger = (rstrm->in_boundry += recvsize); |
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| 188 | rstrm->fbtbc = 0; |
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| 189 | rstrm->last_frag = TRUE; |
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| 190 | } |
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| 191 | |
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| 192 | |
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| 193 | /* |
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| 194 | * The reoutines defined below are the xdr ops which will go into the |
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| 195 | * xdr handle filled in by xdrrec_create. |
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| 196 | */ |
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| 197 | |
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| 198 | static bool_t |
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[9d1596d6] | 199 | xdrrec_getlong( |
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| 200 | XDR *xdrs, |
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| 201 | long *lp) |
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[df49c60] | 202 | { |
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| 203 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 204 | register int32_t *buflp = (int32_t *)(rstrm->in_finger); |
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| 205 | int32_t mylong; |
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| 206 | |
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| 207 | /* first try the inline, fast case */ |
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| 208 | if ((rstrm->fbtbc >= sizeof(int32_t)) && |
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[cf04e8ac] | 209 | (((intptr_t)rstrm->in_boundry - (intptr_t)buflp) >= sizeof(int32_t))) { |
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[df49c60] | 210 | *lp = (long)ntohl((u_int32_t)(*buflp)); |
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| 211 | rstrm->fbtbc -= sizeof(int32_t); |
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| 212 | rstrm->in_finger += sizeof(int32_t); |
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| 213 | } else { |
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| 214 | if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t))) |
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| 215 | return (FALSE); |
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| 216 | *lp = (long)ntohl((u_int32_t)mylong); |
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| 217 | } |
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| 218 | return (TRUE); |
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| 219 | } |
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| 220 | |
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| 221 | static bool_t |
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[9d1596d6] | 222 | xdrrec_putlong( |
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| 223 | XDR *xdrs, |
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| 224 | long *lp) |
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[df49c60] | 225 | { |
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| 226 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 227 | register int32_t *dest_lp = ((int32_t *)(rstrm->out_finger)); |
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| 228 | |
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| 229 | if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) { |
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| 230 | /* |
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| 231 | * this case should almost never happen so the code is |
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| 232 | * inefficient |
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| 233 | */ |
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| 234 | rstrm->out_finger -= sizeof(int32_t); |
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| 235 | rstrm->frag_sent = TRUE; |
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| 236 | if (! flush_out(rstrm, FALSE)) |
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| 237 | return (FALSE); |
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| 238 | dest_lp = ((int32_t *)(rstrm->out_finger)); |
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| 239 | rstrm->out_finger += sizeof(int32_t); |
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| 240 | } |
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| 241 | *dest_lp = (int32_t)htonl((u_int32_t)(*lp)); |
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| 242 | return (TRUE); |
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| 243 | } |
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| 244 | |
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| 245 | static bool_t /* must manage buffers, fragments, and records */ |
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[9d1596d6] | 246 | xdrrec_getbytes( |
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| 247 | XDR *xdrs, |
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| 248 | register caddr_t addr, |
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| 249 | register u_int len) |
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[df49c60] | 250 | { |
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| 251 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 252 | register int current; |
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| 253 | |
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| 254 | while (len > 0) { |
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| 255 | current = rstrm->fbtbc; |
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| 256 | if (current == 0) { |
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| 257 | if (rstrm->last_frag) |
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| 258 | return (FALSE); |
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| 259 | if (! set_input_fragment(rstrm)) |
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| 260 | return (FALSE); |
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| 261 | continue; |
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| 262 | } |
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| 263 | current = (len < current) ? len : current; |
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| 264 | if (! get_input_bytes(rstrm, addr, current)) |
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| 265 | return (FALSE); |
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| 266 | addr += current; |
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| 267 | rstrm->fbtbc -= current; |
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| 268 | len -= current; |
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| 269 | } |
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| 270 | return (TRUE); |
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| 271 | } |
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| 272 | |
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| 273 | static bool_t |
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[9d1596d6] | 274 | xdrrec_putbytes( |
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| 275 | XDR *xdrs, |
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| 276 | caddr_t addr, |
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| 277 | u_int len) |
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[df49c60] | 278 | { |
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| 279 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 280 | register long current; |
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| 281 | |
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| 282 | while (len > 0) { |
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[cf04e8ac] | 283 | current = (intptr_t)rstrm->out_boundry - |
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| 284 | (intptr_t)rstrm->out_finger; |
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[df49c60] | 285 | current = (len < current) ? len : current; |
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| 286 | memcpy(rstrm->out_finger, addr, current); |
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| 287 | rstrm->out_finger += current; |
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| 288 | addr += current; |
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| 289 | len -= current; |
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| 290 | if (rstrm->out_finger == rstrm->out_boundry) { |
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| 291 | rstrm->frag_sent = TRUE; |
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| 292 | if (! flush_out(rstrm, FALSE)) |
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| 293 | return (FALSE); |
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| 294 | } |
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| 295 | } |
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| 296 | return (TRUE); |
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| 297 | } |
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| 298 | |
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| 299 | static u_int |
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[9d1596d6] | 300 | xdrrec_getpos( |
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| 301 | XDR *xdrs) |
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[df49c60] | 302 | { |
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| 303 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 304 | register long pos; |
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| 305 | |
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[cf04e8ac] | 306 | pos = lseek((intptr_t)rstrm->tcp_handle, (off_t) 0, 1); |
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[df49c60] | 307 | if (pos != -1) |
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| 308 | switch (xdrs->x_op) { |
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| 309 | |
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| 310 | case XDR_ENCODE: |
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| 311 | pos += rstrm->out_finger - rstrm->out_base; |
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| 312 | break; |
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| 313 | |
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| 314 | case XDR_DECODE: |
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| 315 | pos -= rstrm->in_boundry - rstrm->in_finger; |
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| 316 | break; |
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| 317 | |
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| 318 | default: |
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| 319 | pos = -1; |
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| 320 | break; |
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| 321 | } |
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| 322 | return ((u_int) pos); |
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| 323 | } |
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| 324 | |
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| 325 | static bool_t |
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[9d1596d6] | 326 | xdrrec_setpos( |
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| 327 | XDR *xdrs, |
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| 328 | u_int pos) |
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[df49c60] | 329 | { |
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| 330 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 331 | u_int currpos = xdrrec_getpos(xdrs); |
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| 332 | int delta = currpos - pos; |
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| 333 | caddr_t newpos; |
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| 334 | |
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| 335 | if ((int)currpos != -1) |
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| 336 | switch (xdrs->x_op) { |
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| 337 | |
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| 338 | case XDR_ENCODE: |
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| 339 | newpos = rstrm->out_finger - delta; |
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| 340 | if ((newpos > (caddr_t)(rstrm->frag_header)) && |
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| 341 | (newpos < rstrm->out_boundry)) { |
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| 342 | rstrm->out_finger = newpos; |
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| 343 | return (TRUE); |
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| 344 | } |
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| 345 | break; |
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| 346 | |
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| 347 | case XDR_DECODE: |
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| 348 | newpos = rstrm->in_finger - delta; |
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| 349 | if ((delta < (int)(rstrm->fbtbc)) && |
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| 350 | (newpos <= rstrm->in_boundry) && |
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| 351 | (newpos >= rstrm->in_base)) { |
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| 352 | rstrm->in_finger = newpos; |
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| 353 | rstrm->fbtbc -= delta; |
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| 354 | return (TRUE); |
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| 355 | } |
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| 356 | break; |
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| 357 | case XDR_FREE: /* to avoid warning */ |
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| 358 | break; |
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| 359 | } |
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| 360 | return (FALSE); |
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| 361 | } |
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| 362 | |
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| 363 | static int32_t * |
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[9d1596d6] | 364 | xdrrec_inline( |
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| 365 | XDR *xdrs, |
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| 366 | int len) |
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[df49c60] | 367 | { |
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| 368 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 369 | int32_t * buf = NULL; |
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| 370 | |
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| 371 | switch (xdrs->x_op) { |
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| 372 | |
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| 373 | case XDR_ENCODE: |
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| 374 | if ((rstrm->out_finger + len) <= rstrm->out_boundry) { |
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| 375 | buf = (int32_t *) rstrm->out_finger; |
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| 376 | rstrm->out_finger += len; |
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| 377 | } |
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| 378 | break; |
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| 379 | |
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| 380 | case XDR_DECODE: |
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| 381 | if ((len <= rstrm->fbtbc) && |
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| 382 | ((rstrm->in_finger + len) <= rstrm->in_boundry)) { |
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| 383 | buf = (int32_t *) rstrm->in_finger; |
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| 384 | rstrm->fbtbc -= len; |
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| 385 | rstrm->in_finger += len; |
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| 386 | } |
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| 387 | break; |
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| 388 | case XDR_FREE: /* to avoid warning */ |
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| 389 | break; |
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| 390 | } |
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| 391 | return (buf); |
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| 392 | } |
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| 393 | |
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| 394 | static void |
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[9d1596d6] | 395 | xdrrec_destroy( |
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| 396 | XDR *xdrs) |
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[df49c60] | 397 | { |
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| 398 | register RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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| 399 | |
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| 400 | mem_free(rstrm->the_buffer, |
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| 401 | rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT); |
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| 402 | mem_free((caddr_t)rstrm, sizeof(RECSTREAM)); |
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| 403 | } |
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| 404 | |
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| 405 | |
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| 406 | /* |
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| 407 | * Exported routines to manage xdr records |
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| 408 | */ |
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| 409 | |
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| 410 | /* |
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| 411 | * Before reading (deserializing from the stream, one should always call |
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| 412 | * this procedure to guarantee proper record alignment. |
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| 413 | */ |
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| 414 | bool_t |
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[9d1596d6] | 415 | xdrrec_skiprecord( |
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| 416 | XDR *xdrs) |
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[df49c60] | 417 | { |
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| 418 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 419 | |
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| 420 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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| 421 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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| 422 | return (FALSE); |
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| 423 | rstrm->fbtbc = 0; |
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| 424 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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| 425 | return (FALSE); |
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| 426 | } |
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| 427 | rstrm->last_frag = FALSE; |
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| 428 | return (TRUE); |
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| 429 | } |
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| 430 | |
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| 431 | /* |
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| 432 | * Look ahead fuction. |
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| 433 | * Returns TRUE iff there is no more input in the buffer |
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| 434 | * after consuming the rest of the current record. |
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| 435 | */ |
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| 436 | bool_t |
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[9d1596d6] | 437 | xdrrec_eof( |
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| 438 | XDR *xdrs) |
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[df49c60] | 439 | { |
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| 440 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 441 | |
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| 442 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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| 443 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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| 444 | return (TRUE); |
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| 445 | rstrm->fbtbc = 0; |
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| 446 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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| 447 | return (TRUE); |
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| 448 | } |
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| 449 | if (rstrm->in_finger == rstrm->in_boundry) |
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| 450 | return (TRUE); |
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| 451 | return (FALSE); |
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| 452 | } |
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| 453 | |
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| 454 | /* |
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| 455 | * The client must tell the package when an end-of-record has occurred. |
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| 456 | * The second paraemters tells whether the record should be flushed to the |
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| 457 | * (output) tcp stream. (This let's the package support batched or |
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| 458 | * pipelined procedure calls.) TRUE => immmediate flush to tcp connection. |
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| 459 | */ |
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| 460 | bool_t |
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[9d1596d6] | 461 | xdrrec_endofrecord( |
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| 462 | XDR *xdrs, |
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| 463 | bool_t sendnow) |
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[df49c60] | 464 | { |
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| 465 | register RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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| 466 | register u_long len; /* fragment length */ |
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| 467 | |
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| 468 | if (sendnow || rstrm->frag_sent || |
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[cf04e8ac] | 469 | ((uintptr_t)rstrm->out_finger + sizeof(u_int32_t) >= |
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| 470 | (uintptr_t)rstrm->out_boundry)) { |
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[df49c60] | 471 | rstrm->frag_sent = FALSE; |
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| 472 | return (flush_out(rstrm, TRUE)); |
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| 473 | } |
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[cf04e8ac] | 474 | len = (uintptr_t)(rstrm->out_finger) - (uintptr_t)(rstrm->frag_header) - |
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[df49c60] | 475 | sizeof(u_int32_t); |
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[cf04e8ac] | 476 | *(rstrm->frag_header) = htonl((u_int32_t)len | LAST_FRAG); |
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[df49c60] | 477 | rstrm->frag_header = (u_int32_t *)rstrm->out_finger; |
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| 478 | rstrm->out_finger += sizeof(u_int32_t); |
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| 479 | return (TRUE); |
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| 480 | } |
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| 481 | |
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| 482 | |
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| 483 | /* |
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| 484 | * Internal useful routines |
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| 485 | */ |
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| 486 | static bool_t |
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[9d1596d6] | 487 | flush_out( |
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| 488 | RECSTREAM *rstrm, |
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| 489 | bool_t eor) |
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[df49c60] | 490 | { |
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[cf04e8ac] | 491 | register u_int32_t eormask = (eor == TRUE) ? LAST_FRAG : 0; |
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| 492 | register u_int32_t len = (uintptr_t)(rstrm->out_finger) - |
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| 493 | (uintptr_t)(rstrm->frag_header) - sizeof(u_int32_t); |
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[df49c60] | 494 | |
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| 495 | *(rstrm->frag_header) = htonl(len | eormask); |
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[cf04e8ac] | 496 | len = (uintptr_t)(rstrm->out_finger) - (uintptr_t)(rstrm->out_base); |
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[df49c60] | 497 | if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len) |
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| 498 | != (int)len) |
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| 499 | return (FALSE); |
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| 500 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
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| 501 | rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t); |
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| 502 | return (TRUE); |
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| 503 | } |
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| 504 | |
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| 505 | static bool_t /* knows nothing about records! Only about input buffers */ |
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[9d1596d6] | 506 | fill_input_buf( |
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| 507 | RECSTREAM *rstrm) |
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[df49c60] | 508 | { |
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| 509 | register caddr_t where; |
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| 510 | u_long i; |
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| 511 | register long len; |
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| 512 | |
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| 513 | where = rstrm->in_base; |
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[cf04e8ac] | 514 | i = (uintptr_t)rstrm->in_boundry % BYTES_PER_XDR_UNIT; |
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[df49c60] | 515 | where += i; |
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| 516 | len = rstrm->in_size - i; |
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| 517 | if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1) |
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| 518 | return (FALSE); |
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| 519 | rstrm->in_finger = where; |
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| 520 | where += len; |
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| 521 | rstrm->in_boundry = where; |
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| 522 | return (TRUE); |
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| 523 | } |
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| 524 | |
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| 525 | static bool_t /* knows nothing about records! Only about input buffers */ |
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[9d1596d6] | 526 | get_input_bytes( |
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| 527 | RECSTREAM *rstrm, |
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| 528 | caddr_t addr, |
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| 529 | int len) |
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[df49c60] | 530 | { |
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| 531 | register long current; |
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| 532 | |
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| 533 | while (len > 0) { |
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[cf04e8ac] | 534 | current = (intptr_t)rstrm->in_boundry - (intptr_t)rstrm->in_finger; |
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[df49c60] | 535 | if (current == 0) { |
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| 536 | if (! fill_input_buf(rstrm)) |
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| 537 | return (FALSE); |
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| 538 | continue; |
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| 539 | } |
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| 540 | current = (len < current) ? len : current; |
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| 541 | memcpy(addr, rstrm->in_finger, current); |
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| 542 | rstrm->in_finger += current; |
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| 543 | addr += current; |
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| 544 | len -= current; |
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| 545 | } |
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| 546 | return (TRUE); |
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| 547 | } |
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| 548 | |
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| 549 | static bool_t /* next two bytes of the input stream are treated as a header */ |
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[9d1596d6] | 550 | set_input_fragment( |
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| 551 | RECSTREAM *rstrm) |
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[df49c60] | 552 | { |
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| 553 | u_int32_t header; |
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| 554 | |
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| 555 | if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header))) |
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| 556 | return (FALSE); |
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| 557 | header = (long)ntohl(header); |
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| 558 | rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE; |
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| 559 | /* |
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| 560 | * Sanity check. Try not to accept wildly incorrect |
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| 561 | * record sizes. Unfortunately, the only record size |
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| 562 | * we can positively identify as being 'wildly incorrect' |
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| 563 | * is zero. Ridiculously large record sizes may look wrong, |
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| 564 | * but we don't have any way to be certain that they aren't |
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| 565 | * what the client actually intended to send us. |
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| 566 | */ |
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| 567 | if (header == 0) |
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| 568 | return(FALSE); |
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| 569 | rstrm->fbtbc = header & (~LAST_FRAG); |
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| 570 | return (TRUE); |
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| 571 | } |
---|
| 572 | |
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| 573 | static bool_t /* consumes input bytes; knows nothing about records! */ |
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[9d1596d6] | 574 | skip_input_bytes( |
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| 575 | RECSTREAM *rstrm, |
---|
| 576 | long cnt) |
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[df49c60] | 577 | { |
---|
| 578 | register long current; |
---|
| 579 | |
---|
| 580 | while (cnt > 0) { |
---|
[cf04e8ac] | 581 | current = (intptr_t)rstrm->in_boundry - (intptr_t)rstrm->in_finger; |
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[df49c60] | 582 | if (current == 0) { |
---|
| 583 | if (! fill_input_buf(rstrm)) |
---|
| 584 | return (FALSE); |
---|
| 585 | continue; |
---|
| 586 | } |
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| 587 | current = (cnt < current) ? cnt : current; |
---|
| 588 | rstrm->in_finger += current; |
---|
| 589 | cnt -= current; |
---|
| 590 | } |
---|
| 591 | return (TRUE); |
---|
| 592 | } |
---|
| 593 | |
---|
| 594 | static u_int |
---|
[9d1596d6] | 595 | fix_buf_size( |
---|
| 596 | u_int s) |
---|
[df49c60] | 597 | { |
---|
| 598 | |
---|
| 599 | if (s < 100) |
---|
| 600 | s = 4000; |
---|
| 601 | return (RNDUP(s)); |
---|
| 602 | } |
---|