| /* $PostgreSQL: pgsql/src/port/inet_aton.c,v 1.10 2007/03/26 21:44:11 momjian Exp $ |
| * |
| * This inet_aton() function was taken from the GNU C library and |
| * incorporated into Postgres for those systems which do not have this |
| * routine in their standard C libraries. |
| * |
| * The function was been extracted whole from the file inet_aton.c in |
| * Release 5.3.12 of the Linux C library, which is derived from the |
| * GNU C library, by Bryan Henderson in October 1996. The copyright |
| * notice from that file is below. |
| */ |
| |
| /* |
| * 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. 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. */ |
| |
| #include "c.h" |
| |
| #include <netinet/in.h> |
| #include <ctype.h> |
| |
| /* |
| * 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(const char *cp, struct in_addr * addr) |
| { |
| unsigned int val; |
| int base, |
| n; |
| char c; |
| u_int parts[4]; |
| 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 (isdigit((unsigned char) c)) |
| { |
| val = (val * base) + (c - '0'); |
| cp++; |
| continue; |
| } |
| if (base == 16 && isxdigit((unsigned char) c)) |
| { |
| val = (val << 4) + |
| (c + 10 - (islower((unsigned char) 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 junk. |
| */ |
| while (*cp) |
| if (!isspace((unsigned char) *cp++)) |
| return 0; |
| |
| /* |
| * Concoct the address according to the number of parts specified. |
| */ |
| n = pp - parts + 1; |
| switch (n) |
| { |
| |
| 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; |
| } |