lib/libform/type_ipv4.c

   1 /*      $NetBSD: type_ipv4.c,v 1.9 2004/11/24 11:57:09 blymn Exp $      */
   2
   3 /*-
   4  * Copyright (c) 1998-1999 Brett Lymn
   5  *                         (blymn@baea.com.au, brett_lymn@yahoo.com.au)
   6  * All rights reserved.
   7  *
   8  * This code has been donated to The NetBSD Foundation by the Author.
   9  *
  10  * Redistribution and use in source and binary forms, with or without
  11  * modification, are permitted provided that the following conditions
  12  * are met:
  13  * 1. Redistributions of source code must retain the above copyright
  14  *    notice, this list of conditions and the following disclaimer.
  15  * 2. The name of the author may not be used to endorse or promote products
  16  *    derived from this software without specific prior written permission
  17  *
  18  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
  19  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  20  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
  21  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
  22  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
  23  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  24  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  25  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  26  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
  27  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  28  *
  29  *
  30  */
  31
  32 #include <sys/cdefs.h>
  33 __RCSID("$NetBSD: type_ipv4.c,v 1.9 2004/11/24 11:57:09 blymn Exp $");
  34
  35 #include <string.h>
  36 #include <stdlib.h>
  37 #include <ctype.h>
  38 #include <errno.h>
  39 #include <limits.h>
  40 #include "form.h"
  41 #include "internals.h"
  42
  43 /*
  44  * The IP v4 address type handling.
  45  */
  46
  47 /*
  48  * define the styles of address we can have, they are:
  49  *    FORMI_DOTTED_QUAD    address of form aaa.bbb.ccc.ddd
  50  *    FORMI_HEX            address of form 0xaabbccdd
  51  *    FORMI_CLASSLESS      address of form aaa.bbb.ccc.ddd/ee
  52  */
  53 #define FORMI_DOTTED_QUAD  0
  54 #define FORMI_HEX          1
  55 #define FORMI_CLASSLESS    2
  56
  57 /*
  58  * Check the contents of the field buffer are a valid IPv4 address only.
  59  */
  60 static int
  61 ipv4_check_field(FIELD *field, char *args)
  62 {
  63         char *buf, *buf1, *keeper, *p, *slash;
  64         unsigned int vals[4], style, start, mask;
  65         unsigned long hex_val, working;
  66         int i;
  67
  68         if (args == NULL)
  69                 return FALSE;
  70
  71         if (asprintf(&keeper, "%s", args) < 0)
  72                 return FALSE;
  73
  74 #ifdef DEBUG
  75         fprintf(dbg, "ipv4_check_field: enter with args of %s\n", keeper);
  76 #endif
  77         style = FORMI_DOTTED_QUAD;
  78         buf = keeper;
  79         hex_val = 0;
  80         mask = 0;
  81
  82         if ((slash = index(buf, '/')) != NULL)
  83                 style = FORMI_CLASSLESS;
  84         else {
  85                 start = _formi_skip_blanks(buf, 0);
  86                 if ((buf[start] != '\0') && (buf[start + 1] != '\0') &&
  87                     (buf[start] == '0') && ((buf[start + 1] == 'x') ||
  88                                             (buf[start + 1] == 'X')))
  89                         style = FORMI_HEX;
  90         }
  91
  92         switch (style) {
  93         case FORMI_CLASSLESS:
  94                 *slash = '\0';
  95                 slash++;
  96                 mask = atoi(slash);
  97                 if (mask > 32)
  98                         goto FAIL;
  99                   /* FALLTHROUGH */
 100
 101         case FORMI_DOTTED_QUAD:
 102                 for (i = 0; i < 4; i++) {
 103                         p = strsep(&buf, ".");
 104                         if ((p == NULL) || (*p == '\0'))
 105                                 goto FAIL;
 106                         vals[i] = atoi(p);
 107                         if (vals[i] > 255)
 108                                 goto FAIL;
 109                 }
 110                 break;
 111
 112
 113         case FORMI_HEX:
 114                 errno = 0;
 115                 hex_val = strtoul(buf, NULL, 16);
 116                 if ((hex_val == ULONG_MAX) && (errno == ERANGE))
 117                         goto FAIL;
 118
 119                 working = hex_val;
 120                 for (i = 3; i >= 0; i--) {
 121                         vals[i] = (unsigned int)(working & 0xffUL);
 122                         working = working >> 8;
 123                 }
 124                 break;
 125
 126         }
 127
 128         free(keeper);
 129
 130         buf1 = NULL;
 131
 132         switch (style) {
 133         case FORMI_DOTTED_QUAD:
 134                 if (asprintf(&buf, "%d.%d.%d.%d", vals[0], vals[1], vals[2],
 135                              vals[3]) < 0)
 136                         return FALSE;
 137                 if (asprintf(&buf1, "%d.%d.%d.%d", vals[0], vals[1],
 138                              vals[2], vals[3]) < 0)
 139                         return FALSE;
 140                 break;
 141
 142         case FORMI_CLASSLESS:
 143                 if (asprintf(&buf, "%d.%d.%d.%d/%d", vals[0], vals[1],
 144                              vals[2], vals[3], mask) < 0)
 145                         return FALSE;
 146                 if (asprintf(&buf1, "%d.%d.%d.%d", vals[0], vals[1],
 147                              vals[2], vals[3]) < 0)
 148                         return FALSE;
 149                 break;
 150
 151         case FORMI_HEX:
 152                 if (asprintf(&buf, "0x%.8lx", hex_val) < 0)
 153                         return FALSE;
 154                 if (asprintf(&buf1, "%d.%d.%d.%d", vals[0], vals[1],
 155                              vals[2], vals[3]) < 0)
 156                         return FALSE;
 157                 break;
 158         }
 159
 160           /* re-set the field buffer to be the reformatted IPv4 address */
 161         set_field_buffer(field, 0, buf);
 162
 163           /*
 164            * Set the field buffer 1 to the dotted quad format regardless
 165            * of the input format, only if buffer 1 exists.
 166            */
 167         if (field->nbuf > 1)
 168                 set_field_buffer(field, 1, buf1);
 169
 170 #ifdef DEBUG
 171         fprintf(dbg, "ipv4_check_field: buf0 set to %s\n", buf);
 172         fprintf(dbg, "ipv4_check_field: buf1 set to %s\n", buf1);
 173 #endif
 174         free(buf);
 175         free(buf1);
 176
 177         return TRUE;
 178
 179           /* bail out point if we got a bad entry */
 180   FAIL:
 181         free(keeper);
 182         return FALSE;
 183
 184 }
 185
 186 /*
 187  * Check the given character is numeric, return TRUE if it is.
 188  */
 189 static int
 190 ipv4_check_char(/* ARGSUSED1 */ int c, char *args)
 191 {
 192         return (isxdigit(c) || (c == '.') || (tolower(c) == 'x') ||
 193                 (c == '/'))? TRUE : FALSE;
 194 }
 195
 196 static FIELDTYPE builtin_ipv4 = {
 197         _TYPE_IS_BUILTIN,                   /* flags */
 198         0,                                  /* refcount */
 199         NULL,                               /* link */
 200         NULL,                               /* make_args */
 201         NULL,                               /* copy_args */
 202         NULL,                               /* free_args */
 203         ipv4_check_field,                   /* field_check */
 204         ipv4_check_char,                    /* char_check */
 205         NULL,                               /* next_choice */
 206         NULL                                /* prev_choice */
 207 };
 208
 209 FIELDTYPE *TYPE_IPV4 = &builtin_ipv4;
 210
 211