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 | #ifdef HAVE_CONFIG_H |
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53 | #include "config.h" |
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54 | #endif |
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55 | |
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56 | #include <stdio.h> |
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57 | #include <stdlib.h> |
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58 | #include <string.h> |
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59 | #include <rpc/types.h> |
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60 | #include <rpc/xdr.h> |
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61 | #include <netinet/in.h> |
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62 | #include <unistd.h> /* for lseek() */ |
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63 | |
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64 | typedef struct rec_strm RECSTREAM; |
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65 | |
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66 | static u_int fix_buf_size(u_int); |
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67 | static bool_t flush_out(RECSTREAM *rstrm, bool_t eor); |
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68 | static bool_t get_input_bytes(RECSTREAM *rstrm, caddr_t addr, int len); |
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69 | static bool_t set_input_fragment(RECSTREAM *rstrm); |
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70 | static bool_t skip_input_bytes(RECSTREAM *rstrm, long cnt); |
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71 | |
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72 | static bool_t xdrrec_getlong(XDR *xdrs, long *lp); |
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73 | static bool_t xdrrec_putlong(XDR *xdrs, const long *lp); |
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74 | static bool_t xdrrec_getbytes(XDR *xdrs, caddr_t addr, u_int len); |
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75 | static bool_t xdrrec_putbytes(XDR *xdrs, const char *addr, u_int len); |
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76 | static u_int xdrrec_getpos(XDR *xdrs); |
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77 | static bool_t xdrrec_setpos(XDR *xdrs, u_int pos); |
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78 | static int32_t *xdrrec_inline(XDR *xdrs, u_int len); |
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79 | static void xdrrec_destroy(XDR *xdrs); |
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80 | |
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81 | static struct xdr_ops xdrrec_ops = { |
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82 | xdrrec_getlong, |
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83 | xdrrec_putlong, |
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84 | xdrrec_getbytes, |
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85 | xdrrec_putbytes, |
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86 | xdrrec_getpos, |
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87 | xdrrec_setpos, |
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88 | xdrrec_inline, |
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89 | xdrrec_destroy |
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90 | }; |
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91 | |
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92 | /* |
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93 | * A record is composed of one or more record fragments. |
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94 | * A record fragment is a two-byte header followed by zero to |
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95 | * 2**32-1 bytes. The header is treated as a long unsigned and is |
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96 | * encode/decoded to the network via htonl/ntohl. The low order 31 bits |
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97 | * are a byte count of the fragment. The highest order bit is a boolean: |
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98 | * 1 => this fragment is the last fragment of the record, |
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99 | * 0 => this fragment is followed by more fragment(s). |
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100 | * |
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101 | * The fragment/record machinery is not general; it is constructed to |
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102 | * meet the needs of xdr and rpc based on tcp. |
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103 | */ |
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104 | |
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105 | #define LAST_FRAG ((u_int32_t)(1L << 31)) |
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106 | |
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107 | struct rec_strm { |
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108 | caddr_t tcp_handle; |
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109 | caddr_t the_buffer; |
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110 | /* |
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111 | * out-goung bits |
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112 | */ |
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113 | int (*writeit) (caddr_t, caddr_t, int); |
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114 | caddr_t out_base; /* output buffer (points to frag header) */ |
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115 | caddr_t out_finger; /* next output position */ |
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116 | caddr_t out_boundry; /* data cannot up to this address */ |
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117 | u_int32_t *frag_header; /* beginning of current fragment */ |
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118 | bool_t frag_sent; /* true if buffer sent in middle of record */ |
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119 | /* |
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120 | * in-coming bits |
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121 | */ |
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122 | int (*readit) (caddr_t, caddr_t, int); |
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123 | u_long in_size; /* fixed size of the input buffer */ |
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124 | caddr_t in_base; |
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125 | caddr_t in_finger; /* location of next byte to be had */ |
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126 | caddr_t in_boundry; /* can read up to this location */ |
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127 | long fbtbc; /* fragment bytes to be consumed */ |
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128 | bool_t last_frag; |
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129 | u_int sendsize; |
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130 | u_int recvsize; |
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131 | }; |
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132 | |
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133 | |
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134 | /* |
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135 | * Create an xdr handle for xdrrec |
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136 | * xdrrec_create fills in xdrs. Sendsize and recvsize are |
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137 | * send and recv buffer sizes (0 => use default). |
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138 | * tcp_handle is an opaque handle that is passed as the first parameter to |
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139 | * the procedures readit and writeit. Readit and writeit are read and |
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140 | * write respectively. They are like the system |
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141 | * calls expect that they take an opaque handle rather than an fd. |
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142 | */ |
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143 | void |
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144 | xdrrec_create( |
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145 | XDR *xdrs, |
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146 | u_int sendsize, |
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147 | u_int recvsize, |
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148 | void *tcp_handle, |
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149 | int (*readit)(void*, void*, int), /* like read, but pass it a tcp_handle, not sock */ |
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150 | int (*writeit)(void*, void*, int) /* like write, but pass it a tcp_handle, not sock */ |
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151 | ) |
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152 | { |
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153 | RECSTREAM *rstrm = |
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154 | (RECSTREAM *)mem_alloc(sizeof(RECSTREAM)); |
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155 | |
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156 | if (rstrm == NULL) { |
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157 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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158 | /* |
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159 | * This is bad. Should rework xdrrec_create to |
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160 | * return a handle, and in this case return NULL |
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161 | */ |
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162 | return; |
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163 | } |
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164 | /* |
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165 | * adjust sizes and allocate buffer quad byte aligned |
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166 | */ |
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167 | rstrm->sendsize = sendsize = fix_buf_size(sendsize); |
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168 | rstrm->recvsize = recvsize = fix_buf_size(recvsize); |
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169 | rstrm->the_buffer = mem_alloc(sendsize + recvsize + BYTES_PER_XDR_UNIT); |
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170 | if (rstrm->the_buffer == NULL) { |
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171 | (void)fprintf(stderr, "xdrrec_create: out of memory\n"); |
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172 | return; |
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173 | } |
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174 | for (rstrm->out_base = rstrm->the_buffer; |
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175 | (uintptr_t)rstrm->out_base % BYTES_PER_XDR_UNIT != 0; |
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176 | rstrm->out_base++); |
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177 | rstrm->in_base = rstrm->out_base + sendsize; |
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178 | /* |
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179 | * now the rest ... |
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180 | */ |
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181 | xdrs->x_ops = &xdrrec_ops; |
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182 | xdrs->x_private = (caddr_t)rstrm; |
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183 | rstrm->tcp_handle = tcp_handle; |
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184 | rstrm->readit = readit; |
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185 | rstrm->writeit = writeit; |
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186 | rstrm->out_finger = rstrm->out_boundry = rstrm->out_base; |
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187 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
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188 | rstrm->out_finger += sizeof(u_int32_t); |
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189 | rstrm->out_boundry += sendsize; |
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190 | rstrm->frag_sent = FALSE; |
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191 | rstrm->in_size = recvsize; |
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192 | rstrm->in_boundry = rstrm->in_base; |
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193 | rstrm->in_finger = (rstrm->in_boundry += recvsize); |
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194 | rstrm->fbtbc = 0; |
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195 | rstrm->last_frag = TRUE; |
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196 | } |
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197 | |
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198 | |
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199 | /* |
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200 | * The reoutines defined below are the xdr ops which will go into the |
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201 | * xdr handle filled in by xdrrec_create. |
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202 | */ |
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203 | |
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204 | static bool_t |
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205 | xdrrec_getlong( |
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206 | XDR *xdrs, |
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207 | long *lp) |
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208 | { |
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209 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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210 | int32_t *buflp = (int32_t *)(rstrm->in_finger); |
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211 | int32_t mylong; |
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212 | |
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213 | /* first try the inline, fast case */ |
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214 | if ((rstrm->fbtbc >= sizeof(int32_t)) && |
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215 | (((intptr_t)rstrm->in_boundry - (intptr_t)buflp) >= sizeof(int32_t))) { |
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216 | *lp = (long)ntohl((u_int32_t)(*buflp)); |
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217 | rstrm->fbtbc -= sizeof(int32_t); |
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218 | rstrm->in_finger += sizeof(int32_t); |
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219 | } else { |
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220 | if (! xdrrec_getbytes(xdrs, (caddr_t)&mylong, sizeof(int32_t))) |
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221 | return (FALSE); |
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222 | *lp = (long)ntohl((u_int32_t)mylong); |
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223 | } |
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224 | return (TRUE); |
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225 | } |
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226 | |
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227 | static bool_t |
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228 | xdrrec_putlong( |
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229 | XDR *xdrs, |
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230 | const long *lp) |
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231 | { |
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232 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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233 | int32_t *dest_lp = ((int32_t *)(rstrm->out_finger)); |
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234 | |
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235 | if ((rstrm->out_finger += sizeof(int32_t)) > rstrm->out_boundry) { |
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236 | /* |
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237 | * this case should almost never happen so the code is |
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238 | * inefficient |
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239 | */ |
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240 | rstrm->out_finger -= sizeof(int32_t); |
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241 | rstrm->frag_sent = TRUE; |
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242 | if (! flush_out(rstrm, FALSE)) |
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243 | return (FALSE); |
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244 | dest_lp = ((int32_t *)(rstrm->out_finger)); |
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245 | rstrm->out_finger += sizeof(int32_t); |
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246 | } |
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247 | *dest_lp = (int32_t)htonl((u_int32_t)(*lp)); |
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248 | return (TRUE); |
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249 | } |
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250 | |
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251 | static bool_t /* must manage buffers, fragments, and records */ |
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252 | xdrrec_getbytes( |
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253 | XDR *xdrs, |
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254 | caddr_t addr, |
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255 | u_int len) |
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256 | { |
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257 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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258 | int current; |
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259 | |
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260 | while (len > 0) { |
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261 | current = rstrm->fbtbc; |
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262 | if (current == 0) { |
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263 | if (rstrm->last_frag) |
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264 | return (FALSE); |
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265 | if (! set_input_fragment(rstrm)) |
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266 | return (FALSE); |
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267 | continue; |
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268 | } |
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269 | current = (len < current) ? len : current; |
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270 | if (! get_input_bytes(rstrm, addr, current)) |
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271 | return (FALSE); |
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272 | addr += current; |
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273 | rstrm->fbtbc -= current; |
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274 | len -= current; |
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275 | } |
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276 | return (TRUE); |
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277 | } |
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278 | |
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279 | static bool_t |
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280 | xdrrec_putbytes( |
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281 | XDR *xdrs, |
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282 | const char *addr, |
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283 | u_int len) |
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284 | { |
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285 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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286 | long current; |
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287 | |
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288 | while (len > 0) { |
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289 | current = (intptr_t)rstrm->out_boundry - |
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290 | (intptr_t)rstrm->out_finger; |
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291 | current = (len < current) ? len : current; |
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292 | memcpy(rstrm->out_finger, addr, current); |
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293 | rstrm->out_finger += current; |
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294 | addr += current; |
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295 | len -= current; |
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296 | if (rstrm->out_finger == rstrm->out_boundry) { |
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297 | rstrm->frag_sent = TRUE; |
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298 | if (! flush_out(rstrm, FALSE)) |
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299 | return (FALSE); |
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300 | } |
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301 | } |
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302 | return (TRUE); |
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303 | } |
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304 | |
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305 | static u_int |
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306 | xdrrec_getpos( |
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307 | XDR *xdrs) |
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308 | { |
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309 | RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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310 | long pos; |
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311 | |
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312 | pos = lseek((intptr_t)rstrm->tcp_handle, (off_t) 0, 1); |
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313 | if (pos != -1) |
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314 | switch (xdrs->x_op) { |
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315 | |
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316 | case XDR_ENCODE: |
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317 | pos += rstrm->out_finger - rstrm->out_base; |
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318 | break; |
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319 | |
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320 | case XDR_DECODE: |
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321 | pos -= rstrm->in_boundry - rstrm->in_finger; |
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322 | break; |
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323 | |
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324 | default: |
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325 | pos = -1; |
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326 | break; |
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327 | } |
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328 | return ((u_int) pos); |
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329 | } |
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330 | |
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331 | static bool_t |
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332 | xdrrec_setpos( |
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333 | XDR *xdrs, |
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334 | u_int pos) |
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335 | { |
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336 | RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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337 | u_int currpos = xdrrec_getpos(xdrs); |
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338 | int delta = currpos - pos; |
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339 | caddr_t newpos; |
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340 | |
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341 | if ((int)currpos != -1) |
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342 | switch (xdrs->x_op) { |
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343 | |
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344 | case XDR_ENCODE: |
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345 | newpos = rstrm->out_finger - delta; |
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346 | if ((newpos > (caddr_t)(rstrm->frag_header)) && |
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347 | (newpos < rstrm->out_boundry)) { |
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348 | rstrm->out_finger = newpos; |
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349 | return (TRUE); |
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350 | } |
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351 | break; |
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352 | |
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353 | case XDR_DECODE: |
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354 | newpos = rstrm->in_finger - delta; |
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355 | if ((delta < (int)(rstrm->fbtbc)) && |
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356 | (newpos <= rstrm->in_boundry) && |
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357 | (newpos >= rstrm->in_base)) { |
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358 | rstrm->in_finger = newpos; |
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359 | rstrm->fbtbc -= delta; |
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360 | return (TRUE); |
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361 | } |
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362 | break; |
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363 | case XDR_FREE: /* to avoid warning */ |
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364 | break; |
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365 | } |
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366 | return (FALSE); |
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367 | } |
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368 | |
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369 | static int32_t * |
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370 | xdrrec_inline( |
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371 | XDR *xdrs, |
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372 | u_int len) |
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373 | { |
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374 | RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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375 | int32_t * buf = NULL; |
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376 | |
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377 | switch (xdrs->x_op) { |
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378 | |
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379 | case XDR_ENCODE: |
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380 | if ((rstrm->out_finger + len) <= rstrm->out_boundry) { |
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381 | buf = (int32_t *) rstrm->out_finger; |
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382 | rstrm->out_finger += len; |
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383 | } |
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384 | break; |
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385 | |
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386 | case XDR_DECODE: |
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387 | if ((len <= rstrm->fbtbc) && |
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388 | ((rstrm->in_finger + len) <= rstrm->in_boundry)) { |
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389 | buf = (int32_t *) rstrm->in_finger; |
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390 | rstrm->fbtbc -= len; |
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391 | rstrm->in_finger += len; |
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392 | } |
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393 | break; |
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394 | case XDR_FREE: /* to avoid warning */ |
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395 | break; |
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396 | } |
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397 | return (buf); |
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398 | } |
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399 | |
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400 | static void |
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401 | xdrrec_destroy( |
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402 | XDR *xdrs) |
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403 | { |
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404 | RECSTREAM *rstrm = (RECSTREAM *)xdrs->x_private; |
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405 | |
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406 | mem_free(rstrm->the_buffer, |
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407 | rstrm->sendsize + rstrm->recvsize + BYTES_PER_XDR_UNIT); |
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408 | mem_free((caddr_t)rstrm, sizeof(RECSTREAM)); |
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409 | } |
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410 | |
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411 | |
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412 | /* |
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413 | * Exported routines to manage xdr records |
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414 | */ |
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415 | |
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416 | /* |
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417 | * Before reading (deserializing from the stream, one should always call |
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418 | * this procedure to guarantee proper record alignment. |
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419 | */ |
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420 | bool_t |
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421 | xdrrec_skiprecord( |
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422 | XDR *xdrs) |
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423 | { |
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424 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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425 | |
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426 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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427 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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428 | return (FALSE); |
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429 | rstrm->fbtbc = 0; |
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430 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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431 | return (FALSE); |
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432 | } |
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433 | rstrm->last_frag = FALSE; |
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434 | return (TRUE); |
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435 | } |
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436 | |
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437 | /* |
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438 | * Look ahead fuction. |
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439 | * Returns TRUE iff there is no more input in the buffer |
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440 | * after consuming the rest of the current record. |
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441 | */ |
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442 | bool_t |
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443 | xdrrec_eof( |
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444 | XDR *xdrs) |
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445 | { |
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446 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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447 | |
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448 | while (rstrm->fbtbc > 0 || (! rstrm->last_frag)) { |
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449 | if (! skip_input_bytes(rstrm, rstrm->fbtbc)) |
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450 | return (TRUE); |
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451 | rstrm->fbtbc = 0; |
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452 | if ((! rstrm->last_frag) && (! set_input_fragment(rstrm))) |
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453 | return (TRUE); |
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454 | } |
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455 | if (rstrm->in_finger == rstrm->in_boundry) |
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456 | return (TRUE); |
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457 | return (FALSE); |
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458 | } |
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459 | |
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460 | /* |
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461 | * The client must tell the package when an end-of-record has occurred. |
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462 | * The second paraemters tells whether the record should be flushed to the |
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463 | * (output) tcp stream. (This let's the package support batched or |
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464 | * pipelined procedure calls.) TRUE => immmediate flush to tcp connection. |
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465 | */ |
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466 | bool_t |
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467 | xdrrec_endofrecord( |
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468 | XDR *xdrs, |
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469 | int sendnow) |
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470 | { |
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471 | RECSTREAM *rstrm = (RECSTREAM *)(xdrs->x_private); |
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472 | u_long len; /* fragment length */ |
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473 | |
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474 | if (sendnow || rstrm->frag_sent || |
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475 | ((uintptr_t)rstrm->out_finger + sizeof(u_int32_t) >= |
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476 | (uintptr_t)rstrm->out_boundry)) { |
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477 | rstrm->frag_sent = FALSE; |
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478 | return (flush_out(rstrm, TRUE)); |
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479 | } |
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480 | len = (uintptr_t)(rstrm->out_finger) - (uintptr_t)(rstrm->frag_header) - |
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481 | sizeof(u_int32_t); |
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482 | *(rstrm->frag_header) = htonl((u_int32_t)len | LAST_FRAG); |
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483 | rstrm->frag_header = (u_int32_t *)rstrm->out_finger; |
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484 | rstrm->out_finger += sizeof(u_int32_t); |
---|
485 | return (TRUE); |
---|
486 | } |
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487 | |
---|
488 | |
---|
489 | /* |
---|
490 | * Internal useful routines |
---|
491 | */ |
---|
492 | static bool_t |
---|
493 | flush_out( |
---|
494 | RECSTREAM *rstrm, |
---|
495 | bool_t eor) |
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496 | { |
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497 | u_int32_t eormask = (eor == TRUE) ? LAST_FRAG : 0; |
---|
498 | u_int32_t len = (uintptr_t)(rstrm->out_finger) - |
---|
499 | (uintptr_t)(rstrm->frag_header) - sizeof(u_int32_t); |
---|
500 | |
---|
501 | *(rstrm->frag_header) = htonl(len | eormask); |
---|
502 | len = (uintptr_t)(rstrm->out_finger) - (uintptr_t)(rstrm->out_base); |
---|
503 | if ((*(rstrm->writeit))(rstrm->tcp_handle, rstrm->out_base, (int)len) |
---|
504 | != (int)len) |
---|
505 | return (FALSE); |
---|
506 | rstrm->frag_header = (u_int32_t *)rstrm->out_base; |
---|
507 | rstrm->out_finger = (caddr_t)rstrm->out_base + sizeof(u_int32_t); |
---|
508 | return (TRUE); |
---|
509 | } |
---|
510 | |
---|
511 | static bool_t /* knows nothing about records! Only about input buffers */ |
---|
512 | fill_input_buf( |
---|
513 | RECSTREAM *rstrm) |
---|
514 | { |
---|
515 | caddr_t where; |
---|
516 | u_long i; |
---|
517 | long len; |
---|
518 | |
---|
519 | where = rstrm->in_base; |
---|
520 | i = (uintptr_t)rstrm->in_boundry % BYTES_PER_XDR_UNIT; |
---|
521 | where += i; |
---|
522 | len = rstrm->in_size - i; |
---|
523 | if ((len = (*(rstrm->readit))(rstrm->tcp_handle, where, len)) == -1) |
---|
524 | return (FALSE); |
---|
525 | rstrm->in_finger = where; |
---|
526 | where += len; |
---|
527 | rstrm->in_boundry = where; |
---|
528 | return (TRUE); |
---|
529 | } |
---|
530 | |
---|
531 | static bool_t /* knows nothing about records! Only about input buffers */ |
---|
532 | get_input_bytes( |
---|
533 | RECSTREAM *rstrm, |
---|
534 | caddr_t addr, |
---|
535 | int len) |
---|
536 | { |
---|
537 | long current; |
---|
538 | |
---|
539 | while (len > 0) { |
---|
540 | current = (intptr_t)rstrm->in_boundry - (intptr_t)rstrm->in_finger; |
---|
541 | if (current == 0) { |
---|
542 | if (! fill_input_buf(rstrm)) |
---|
543 | return (FALSE); |
---|
544 | continue; |
---|
545 | } |
---|
546 | current = (len < current) ? len : current; |
---|
547 | memcpy(addr, rstrm->in_finger, current); |
---|
548 | rstrm->in_finger += current; |
---|
549 | addr += current; |
---|
550 | len -= current; |
---|
551 | } |
---|
552 | return (TRUE); |
---|
553 | } |
---|
554 | |
---|
555 | static bool_t /* next two bytes of the input stream are treated as a header */ |
---|
556 | set_input_fragment( |
---|
557 | RECSTREAM *rstrm) |
---|
558 | { |
---|
559 | u_int32_t header; |
---|
560 | |
---|
561 | if (! get_input_bytes(rstrm, (caddr_t)&header, sizeof(header))) |
---|
562 | return (FALSE); |
---|
563 | header = (long)ntohl(header); |
---|
564 | rstrm->last_frag = ((header & LAST_FRAG) == 0) ? FALSE : TRUE; |
---|
565 | /* |
---|
566 | * Sanity check. Try not to accept wildly incorrect |
---|
567 | * record sizes. Unfortunately, the only record size |
---|
568 | * we can positively identify as being 'wildly incorrect' |
---|
569 | * is zero. Ridiculously large record sizes may look wrong, |
---|
570 | * but we don't have any way to be certain that they aren't |
---|
571 | * what the client actually intended to send us. |
---|
572 | */ |
---|
573 | if (header == 0) |
---|
574 | return(FALSE); |
---|
575 | rstrm->fbtbc = header & (~LAST_FRAG); |
---|
576 | return (TRUE); |
---|
577 | } |
---|
578 | |
---|
579 | static bool_t /* consumes input bytes; knows nothing about records! */ |
---|
580 | skip_input_bytes( |
---|
581 | RECSTREAM *rstrm, |
---|
582 | long cnt) |
---|
583 | { |
---|
584 | long current; |
---|
585 | |
---|
586 | while (cnt > 0) { |
---|
587 | current = (intptr_t)rstrm->in_boundry - (intptr_t)rstrm->in_finger; |
---|
588 | if (current == 0) { |
---|
589 | if (! fill_input_buf(rstrm)) |
---|
590 | return (FALSE); |
---|
591 | continue; |
---|
592 | } |
---|
593 | current = (cnt < current) ? cnt : current; |
---|
594 | rstrm->in_finger += current; |
---|
595 | cnt -= current; |
---|
596 | } |
---|
597 | return (TRUE); |
---|
598 | } |
---|
599 | |
---|
600 | static u_int |
---|
601 | fix_buf_size( |
---|
602 | u_int s) |
---|
603 | { |
---|
604 | |
---|
605 | if (s < 100) |
---|
606 | s = 4000; |
---|
607 | return (RNDUP(s)); |
---|
608 | } |
---|