contrib/bind-9.5.2/lib/bind/dst/support.c

   1 static const char rcsid[] = "$Header: /proj/cvs/prod/bind9/lib/bind/dst/Attic/support.c,v 1.6 2005/10/11 00:10:13 marka Exp $";
   2
   3
   4 /*
   5  * Portions Copyright (c) 1995-1998 by Trusted Information Systems, Inc.
   6  *
   7  * Permission to use, copy modify, and distribute this software for any
   8  * purpose with or without fee is hereby granted, provided that the above
   9  * copyright notice and this permission notice appear in all copies.
  10  *
  11  * THE SOFTWARE IS PROVIDED "AS IS" AND TRUSTED INFORMATION SYSTEMS
  12  * DISCLAIMS ALL WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL
  13  * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS.  IN NO EVENT SHALL
  14  * TRUSTED INFORMATION SYSTEMS BE LIABLE FOR ANY SPECIAL, DIRECT,
  15  * INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING
  16  * FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT,
  17  * NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION
  18  * WITH THE USE OR PERFORMANCE OF THE SOFTWARE.
  19  */
  20
  21 #include "port_before.h"
  22
  23 #include <stdio.h>
  24 #include <unistd.h>
  25 #include <memory.h>
  26 #include <string.h>
  27 #include <errno.h>
  28 #include <sys/stat.h>
  29 #include <netinet/in.h>
  30 #include <arpa/nameser.h>
  31 #include <resolv.h>
  32
  33 #include "dst_internal.h"
  34
  35 #include "port_after.h"
  36
  37 /*%
  38  * dst_s_verify_str()
  39  *     Validate that the input string(*str) is at the head of the input
  40  *     buffer(**buf).  If so, move the buffer head pointer (*buf) to
  41  *     the first byte of data following the string(*str).
  42  * Parameters
  43  *     buf     Input buffer.
  44  *     str     Input string.
  45  * Return
  46  *      0       *str is not the head of **buff
  47  *      1       *str is the head of **buff, *buf is is advanced to
  48  *      the tail of **buf.
  49  */
  50
  51 int
  52 dst_s_verify_str(const char **buf, const char *str)
  53 {
  54         int b, s;
  55         if (*buf == NULL)       /*%< error checks */
  56                 return (0);
  57         if (str == NULL || *str == '\0')
  58                 return (1);
  59
  60         b = strlen(*buf);       /*%< get length of strings */
  61         s = strlen(str);
  62         if (s > b || strncmp(*buf, str, s))     /*%< check if same */
  63                 return (0);     /*%< not a match */
  64         (*buf) += s;            /*%< advance pointer */
  65         return (1);
  66 }
  67
  68 /*%
  69  * dst_s_calculate_bits
  70  *     Given a binary number represented in a u_char[], determine
  71  *     the number of significant bits used.
  72  * Parameters
  73  *     str       An input character string containing a binary number.
  74  *     max_bits The maximum possible significant bits.
  75  * Return
  76  *     N       The number of significant bits in str.
  77  */
  78
  79 int
  80 dst_s_calculate_bits(const u_char *str, const int max_bits)
  81 {
  82         const u_char *p = str;
  83         u_char i, j = 0x80;
  84         int bits;
  85         for (bits = max_bits; *p == 0x00 && bits > 0; p++)
  86                 bits -= 8;
  87         for (i = *p; (i & j) != j; j >>= 1)
  88                 bits--;
  89         return (bits);
  90 }
  91
  92 /*%
  93  * calculates a checksum used in dst for an id.
  94  * takes an array of bytes and a length.
  95  * returns a 16  bit checksum.
  96  */
  97 u_int16_t
  98 dst_s_id_calc(const u_char *key, const int keysize)
  99 {
 100         u_int32_t ac;
 101         const u_char *kp = key;
 102         int size = keysize;
 103
 104         if (!key || (keysize <= 0))
 105                 return (0xffffU);
 106
 107         for (ac = 0; size > 1; size -= 2, kp += 2)
 108                 ac += ((*kp) << 8) + *(kp + 1);
 109
 110         if (size > 0)
 111                 ac += ((*kp) << 8);
 112         ac += (ac >> 16) & 0xffff;
 113
 114         return (ac & 0xffff);
 115 }
 116
 117 /*%
 118  * dst_s_dns_key_id() Function to calculate DNSSEC footprint from KEY record
 119  *   rdata
 120  * Input:
 121  *      dns_key_rdata: the raw data in wire format
 122  *      rdata_len: the size of the input data
 123  * Output:
 124  *      the key footprint/id calculated from the key data
 125  */
 126 u_int16_t
 127 dst_s_dns_key_id(const u_char *dns_key_rdata, const int rdata_len)
 128 {
 129         if (!dns_key_rdata)
 130                 return 0;
 131
 132         /* compute id */
 133         if (dns_key_rdata[3] == KEY_RSA)        /*%< Algorithm RSA */
 134                 return dst_s_get_int16((const u_char *)
 135                                        &dns_key_rdata[rdata_len - 3]);
 136         else if (dns_key_rdata[3] == KEY_HMAC_MD5)
 137                 /* compatibility */
 138                 return 0;
 139         else
 140                 /* compute a checksum on the key part of the key rr */
 141                 return dst_s_id_calc(dns_key_rdata, rdata_len);
 142 }
 143
 144 /*%
 145  * dst_s_get_int16
 146  *     This routine extracts a 16 bit integer from a two byte character
 147  *     string.  The character string is assumed to be in network byte
 148  *     order and may be unaligned.  The number returned is in host order.
 149  * Parameter
 150  *     buf     A two byte character string.
 151  * Return
 152  *     The converted integer value.
 153  */
 154
 155 u_int16_t
 156 dst_s_get_int16(const u_char *buf)
 157 {
 158         register u_int16_t a = 0;
 159         a = ((u_int16_t)(buf[0] << 8)) | ((u_int16_t)(buf[1]));
 160         return (a);
 161 }
 162
 163 /*%
 164  * dst_s_get_int32
 165  *     This routine extracts a 32 bit integer from a four byte character
 166  *     string.  The character string is assumed to be in network byte
 167  *     order and may be unaligned.  The number returned is in host order.
 168  * Parameter
 169  *     buf     A four byte character string.
 170  * Return
 171  *     The converted integer value.
 172  */
 173
 174 u_int32_t
 175 dst_s_get_int32(const u_char *buf)
 176 {
 177         register u_int32_t a = 0;
 178         a = ((u_int32_t)(buf[0] << 24)) | ((u_int32_t)(buf[1] << 16)) |
 179                 ((u_int32_t)(buf[2] << 8)) | ((u_int32_t)(buf[3]));
 180         return (a);
 181 }
 182
 183 /*%
 184  * dst_s_put_int16
 185  *     Take a 16 bit integer and store the value in a two byte
 186  *     character string.  The integer is assumed to be in network
 187  *     order and the string is returned in host order.
 188  *
 189  * Parameters
 190  *     buf     Storage for a two byte character string.
 191  *     val     16 bit integer.
 192  */
 193
 194 void
 195 dst_s_put_int16(u_int8_t *buf, const u_int16_t val)
 196 {
 197         buf[0] = (u_int8_t)(val >> 8);
 198         buf[1] = (u_int8_t)(val);
 199 }
 200
 201 /*%
 202  * dst_s_put_int32
 203  *     Take a 32 bit integer and store the value in a four byte
 204  *     character string.  The integer is assumed to be in network
 205  *     order and the string is returned in host order.
 206  *
 207  * Parameters
 208  *     buf     Storage for a four byte character string.
 209  *     val     32 bit integer.
 210  */
 211
 212 void
 213 dst_s_put_int32(u_int8_t *buf, const u_int32_t val)
 214 {
 215         buf[0] = (u_int8_t)(val >> 24);
 216         buf[1] = (u_int8_t)(val >> 16);
 217         buf[2] = (u_int8_t)(val >> 8);
 218         buf[3] = (u_int8_t)(val);
 219 }
 220
 221 /*%
 222  *  dst_s_filename_length
 223  *
 224  *      This function returns the number of bytes needed to hold the
 225  *      filename for a key file.  '/', '\' and ':' are not allowed.
 226  *      form:  K&lt;keyname&gt;+&lt;alg&gt;+&lt;id&gt;.&lt;suffix&gt;
 227  *
 228  *      Returns 0 if the filename would contain either '\', '/' or ':'
 229  */
 230 size_t
 231 dst_s_filename_length(const char *name, const char *suffix)
 232 {
 233         if (name == NULL)
 234                 return (0);
 235         if (strrchr(name, '\\'))
 236                 return (0);
 237         if (strrchr(name, '/'))
 238                 return (0);
 239         if (strrchr(name, ':'))
 240                 return (0);
 241         if (suffix == NULL)
 242                 return (0);
 243         if (strrchr(suffix, '\\'))
 244                 return (0);
 245         if (strrchr(suffix, '/'))
 246                 return (0);
 247         if (strrchr(suffix, ':'))
 248                 return (0);
 249         return (1 + strlen(name) + 6 + strlen(suffix));
 250 }
 251
 252 /*%
 253  *  dst_s_build_filename ()
 254  *      Builds a key filename from the key name, it's id, and a
 255  *      suffix.  '\', '/' and ':' are not allowed. fA filename is of the
 256  *      form:  K&lt;keyname&gt;&lt;id&gt;.&lt;suffix&gt;
 257  *      form: K&lt;keyname&gt;+&lt;alg&gt;+&lt;id&gt;.&lt;suffix&gt;
 258  *
 259  *      Returns -1 if the conversion fails:
 260  *        if the filename would be too long for space allotted
 261  *        if the filename would contain a '\', '/' or ':'
 262  *      Returns 0 on success
 263  */
 264
 265 int
 266 dst_s_build_filename(char *filename, const char *name, u_int16_t id,
 267                      int alg, const char *suffix, size_t filename_length)
 268 {
 269         u_int32_t my_id;
 270         if (filename == NULL)
 271                 return (-1);
 272         memset(filename, 0, filename_length);
 273         if (name == NULL)
 274                 return (-1);
 275         if (suffix == NULL)
 276                 return (-1);
 277         if (filename_length < 1 + strlen(name) + 4 + 6 + 1 + strlen(suffix))
 278                 return (-1);
 279         my_id = id;
 280         sprintf(filename, "K%s+%03d+%05d.%s", name, alg, my_id,
 281                 (const char *) suffix);
 282         if (strrchr(filename, '/'))
 283                 return (-1);
 284         if (strrchr(filename, '\\'))
 285                 return (-1);
 286         if (strrchr(filename, ':'))
 287                 return (-1);
 288         return (0);
 289 }
 290
 291 /*%
 292  *  dst_s_fopen ()
 293  *     Open a file in the dst_path directory.  If perm is specified, the
 294  *     file is checked for existence first, and not opened if it exists.
 295  *  Parameters
 296  *     filename  File to open
 297  *     mode       Mode to open the file (passed directly to fopen)
 298  *     perm       File permission, if creating a new file.
 299  *  Returns
 300  *     NULL       Failure
 301  *     NON-NULL  (FILE *) of opened file.
 302  */
 303 FILE *
 304 dst_s_fopen(const char *filename, const char *mode, int perm)
 305 {
 306         FILE *fp;
 307         char pathname[PATH_MAX];
 308
 309         if (strlen(filename) + strlen(dst_path) >= sizeof(pathname))
 310                 return (NULL);
 311
 312         if (*dst_path != '\0') {
 313                 strcpy(pathname, dst_path);
 314                 strcat(pathname, filename);
 315         } else
 316                 strcpy(pathname, filename);
 317
 318         fp = fopen(pathname, mode);
 319         if (perm)
 320                 chmod(pathname, perm);
 321         return (fp);
 322 }
 323
 324 void
 325 dst_s_dump(const int mode, const u_char *data, const int size,
 326             const char *msg)
 327 {
 328         UNUSED(data);
 329
 330         if (size > 0) {
 331 #ifdef LONG_TEST
 332                 static u_char scratch[1000];
 333                 int n ;
 334                 n = b64_ntop(data, scratch, size, sizeof(scratch));
 335                 printf("%s: %x %d %s\n", msg, mode, n, scratch);
 336 #else
 337                 printf("%s,%x %d\n", msg, mode, size);
 338 #endif
 339         }
 340 }
 341
 342 /*! \file */