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Diffstat (limited to 'src/port/inet_aton.c')
-rw-r--r-- | src/port/inet_aton.c | 149 |
1 files changed, 149 insertions, 0 deletions
diff --git a/src/port/inet_aton.c b/src/port/inet_aton.c new file mode 100644 index 0000000..adaf18a --- /dev/null +++ b/src/port/inet_aton.c @@ -0,0 +1,149 @@ +/* src/port/inet_aton.c + * + * 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> + +#include "port/pg_bswap.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 = pg_hton32(val); + return 1; +} |