/*- * Copyright (c) 2001 Charles Mott <cm@linktel.net> * 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. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR 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 AUTHOR 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. */ #include <sys/param.h> #include <sys/systm.h> #include <netinet/in.h> /* XXX ctype.h is missing, see libkern/stdio/scanf.c */ #if 1 static inline int isspace(char c) { return (c == ' ' || c == '\t' || c == '\n' || c == '\12'); } #endif int inet_aton(const char *cp, struct in_addr *addr) { u_long parts[4]; in_addr_t val; const char *c; char *endptr; int gotend, n; c = (const char *)cp; n = 0; /* * Run through the string, grabbing numbers until * the end of the string, or some error */ gotend = 0; while (!gotend) { unsigned long l; l = strtoul(c, &endptr, 0); if (l == ULONG_MAX || (l == 0 && endptr == c)) return (0); val = (in_addr_t)l; /* * If the whole string is invalid, endptr will equal * c.. this way we can make sure someone hasn't * gone '.12' or something which would get past * the next check. */ if (endptr == c) return (0); parts[n] = val; c = endptr; /* Check the next character past the previous number's end */ switch (*c) { case '.' : /* Make sure we only do 3 dots .. */ if (n == 3) /* Whoops. Quit. */ return (0); n++; c++; break; case '\0': gotend = 1; break; default: if (isspace((unsigned char)*c)) { gotend = 1; break; } else { /* Invalid character, then fail. */ return (0); } } } /* Concoct the address according to the number of parts specified. */ switch (n) { case 0: /* a -- 32 bits */ /* * Nothing is necessary here. Overflow checking was * already done in strtoul(). */ break; case 1: /* a.b -- 8.24 bits */ if (val > 0xffffff || parts[0] > 0xff) return (0); val |= parts[0] << 24; break; case 2: /* a.b.c -- 8.8.16 bits */ if (val > 0xffff || parts[0] > 0xff || parts[1] > 0xff) return (0); val |= (parts[0] << 24) | (parts[1] << 16); break; case 3: /* a.b.c.d -- 8.8.8.8 bits */ if (val > 0xff || parts[0] > 0xff || parts[1] > 0xff || parts[2] > 0xff) return (0); val |= (parts[0] << 24) | (parts[1] << 16) | (parts[2] << 8); break; } if (addr != NULL) addr->s_addr = htonl(val); return (1); }