Local copy of inet_ntoa for systems that don't provide it

diff --git a/common/inet_addr.c b/common/inet_addr.c
new file mode 100644 (file)
index 0000000..26fd079
--- /dev/null
+++ b/common/inet_addr.c
@@ -0,0 +1,150 @@
+/*     $NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $        */
+
+/*
+ * Copyright (c) 1983, 1990, 1993
+ *     The Regents of the University of California.  All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. All advertising materials mentioning features or use of this software
+ *    must display the following acknowledgement:
+ *     This product includes software developed by the University of
+ *     California, Berkeley and its contributors.
+ * 4. Neither the name of the University nor the names of its contributors
+ *    may be used to endorse or promote products derived from this software
+ *    without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
+ * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+#if 0
+static char sccsid[] = "@(#)inet_addr.c        8.1 (Berkeley) 6/17/93";
+#else
+static char rcsid[] = "$NetBSD: inet_addr.c,v 1.6 1996/02/02 15:22:23 mrg Exp $";
+#endif
+#endif /* LIBC_SCCS and not lint */
+
+#ifndef lint
+static char copyright[] =
+"$Id: inet_addr.c,v 1.1 1997/03/29 03:56:23 mellon Exp $ Copyright (c) 1983, 1990, 1993 The Regents of the University of California.  All rights reserved.\n";
+#endif /* not lint */
+
+#include "dhcpd.h"
+
+#ifdef NEED_INET_ATON
+/* 
+ * Check whether "cp" is a valid ascii representation
+ * of an Internet address and convert to a binary address.
+ * Returns 1 if the address is valid, 0 if not.
+ * This replaces inet_addr, the return value from which
+ * cannot distinguish between failure and a local broadcast address.
+ */
+int
+inet_aton(cp, addr)
+       register const char *cp;
+       struct in_addr *addr;
+{
+       register u_long val;
+       register int base, n;
+       register char c;
+       u_int parts[4];
+       register u_int *pp = parts;
+
+       for (;;) {
+               /*
+                * Collect number up to ``.''.
+                * Values are specified as for C:
+                * 0x=hex, 0=octal, other=decimal.
+                */
+               val = 0; base = 10;
+               if (*cp == '0') {
+                       if (*++cp == 'x' || *cp == 'X')
+                               base = 16, cp++;
+                       else
+                               base = 8;
+               }
+               while ((c = *cp) != '\0') {
+                       if (isascii(c) && isdigit(c)) {
+                               val = (val * base) + (c - '0');
+                               cp++;
+                               continue;
+                       }
+                       if (base == 16 && isascii(c) && isxdigit(c)) {
+                               val = (val << 4) + 
+                                       (c + 10 - (islower(c) ? 'a' : 'A'));
+                               cp++;
+                               continue;
+                       }
+                       break;
+               }
+               if (*cp == '.') {
+                       /*
+                        * Internet format:
+                        *      a.b.c.d
+                        *      a.b.c   (with c treated as 16-bits)
+                        *      a.b     (with b treated as 24 bits)
+                        */
+                       if (pp >= parts + 3 || val > 0xff)
+                               return (0);
+                       *pp++ = val, cp++;
+               } else
+                       break;
+       }
+       /*
+        * Check for trailing characters.
+        */
+       if (*cp && (!isascii(*cp) || !isspace(*cp)))
+               return (0);
+       /*
+        * Concoct the address according to
+        * the number of parts specified.
+        */
+       n = pp - parts + 1;
+       switch (n) {
+
+       case 0:
+               return (0);             /* initial nondigit */
+
+       case 1:                         /* a -- 32 bits */
+               break;
+
+       case 2:                         /* a.b -- 8.24 bits */
+               if (val > 0xffffff)
+                       return (0);
+               val |= parts[0] << 24;
+               break;
+
+       case 3:                         /* a.b.c -- 8.8.16 bits */
+               if (val > 0xffff)
+                       return (0);
+               val |= (parts[0] << 24) | (parts[1] << 16);
+               break;
+
+       case 4:                         /* a.b.c.d -- 8.8.8.8 bits */
+               if (val > 0xff)
+                       return (0);
+               val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8);
+               break;
+       }
+       if (addr)
+               addr->s_addr = htonl(val);
+       return (1);
+}
+#endif