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Diffstat (limited to 'src/backend/utils/adt/inet_cidr_ntop.c')
-rw-r--r--src/backend/utils/adt/inet_cidr_ntop.c294
1 files changed, 294 insertions, 0 deletions
diff --git a/src/backend/utils/adt/inet_cidr_ntop.c b/src/backend/utils/adt/inet_cidr_ntop.c
new file mode 100644
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+++ b/src/backend/utils/adt/inet_cidr_ntop.c
@@ -0,0 +1,294 @@
+/*
+ * Copyright (c) 2004 by Internet Systems Consortium, Inc. ("ISC")
+ * Copyright (c) 1996,1999 by Internet Software Consortium.
+ *
+ * Permission to use, copy, modify, and distribute this software for any
+ * purpose with or without fee is hereby granted, provided that the above
+ * copyright notice and this permission notice appear in all copies.
+ *
+ * THE SOFTWARE IS PROVIDED "AS IS" AND ISC DISCLAIMS ALL WARRANTIES
+ * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
+ * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL ISC BE LIABLE FOR
+ * ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
+ * WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
+ * ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT
+ * OF OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
+ *
+ * src/backend/utils/adt/inet_cidr_ntop.c
+ */
+
+#if defined(LIBC_SCCS) && !defined(lint)
+static const char rcsid[] = "Id: inet_net_ntop.c,v 1.1.2.2 2004/03/09 09:17:27 marka Exp $";
+#endif
+
+#include "postgres.h"
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+
+#include "utils/builtins.h"
+#include "utils/inet.h"
+
+
+#ifdef SPRINTF_CHAR
+#define SPRINTF(x) strlen(sprintf/**/x)
+#else
+#define SPRINTF(x) ((size_t)sprintf x)
+#endif
+
+static char *inet_cidr_ntop_ipv4(const u_char *src, int bits,
+ char *dst, size_t size);
+static char *inet_cidr_ntop_ipv6(const u_char *src, int bits,
+ char *dst, size_t size);
+
+/*
+ * char *
+ * pg_inet_cidr_ntop(af, src, bits, dst, size)
+ * convert network number from network to presentation format.
+ * generates CIDR style result always.
+ * return:
+ * pointer to dst, or NULL if an error occurred (check errno).
+ * author:
+ * Paul Vixie (ISC), July 1996
+ */
+char *
+pg_inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size)
+{
+ switch (af)
+ {
+ case PGSQL_AF_INET:
+ return inet_cidr_ntop_ipv4(src, bits, dst, size);
+ case PGSQL_AF_INET6:
+ return inet_cidr_ntop_ipv6(src, bits, dst, size);
+ default:
+ errno = EAFNOSUPPORT;
+ return NULL;
+ }
+}
+
+
+/*
+ * static char *
+ * inet_cidr_ntop_ipv4(src, bits, dst, size)
+ * convert IPv4 network number from network to presentation format.
+ * generates CIDR style result always.
+ * return:
+ * pointer to dst, or NULL if an error occurred (check errno).
+ * note:
+ * network byte order assumed. this means 192.5.5.240/28 has
+ * 0b11110000 in its fourth octet.
+ * author:
+ * Paul Vixie (ISC), July 1996
+ */
+static char *
+inet_cidr_ntop_ipv4(const u_char *src, int bits, char *dst, size_t size)
+{
+ char *odst = dst;
+ char *t;
+ u_int m;
+ int b;
+
+ if (bits < 0 || bits > 32)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ if (bits == 0)
+ {
+ if (size < sizeof "0")
+ goto emsgsize;
+ *dst++ = '0';
+ size--;
+ *dst = '\0';
+ }
+
+ /* Format whole octets. */
+ for (b = bits / 8; b > 0; b--)
+ {
+ if (size <= sizeof "255.")
+ goto emsgsize;
+ t = dst;
+ dst += SPRINTF((dst, "%u", *src++));
+ if (b > 1)
+ {
+ *dst++ = '.';
+ *dst = '\0';
+ }
+ size -= (size_t) (dst - t);
+ }
+
+ /* Format partial octet. */
+ b = bits % 8;
+ if (b > 0)
+ {
+ if (size <= sizeof ".255")
+ goto emsgsize;
+ t = dst;
+ if (dst != odst)
+ *dst++ = '.';
+ m = ((1 << b) - 1) << (8 - b);
+ dst += SPRINTF((dst, "%u", *src & m));
+ size -= (size_t) (dst - t);
+ }
+
+ /* Format CIDR /width. */
+ if (size <= sizeof "/32")
+ goto emsgsize;
+ dst += SPRINTF((dst, "/%u", bits));
+ return odst;
+
+emsgsize:
+ errno = EMSGSIZE;
+ return NULL;
+}
+
+/*
+ * static char *
+ * inet_cidr_ntop_ipv6(src, bits, dst, size)
+ * convert IPv6 network number from network to presentation format.
+ * generates CIDR style result always. Picks the shortest representation
+ * unless the IP is really IPv4.
+ * always prints specified number of bits (bits).
+ * return:
+ * pointer to dst, or NULL if an error occurred (check errno).
+ * note:
+ * network byte order assumed. this means 192.5.5.240/28 has
+ * 0x11110000 in its fourth octet.
+ * author:
+ * Vadim Kogan (UCB), June 2001
+ * Original version (IPv4) by Paul Vixie (ISC), July 1996
+ */
+
+static char *
+inet_cidr_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
+{
+ u_int m;
+ int b;
+ int p;
+ int zero_s,
+ zero_l,
+ tmp_zero_s,
+ tmp_zero_l;
+ int i;
+ int is_ipv4 = 0;
+ unsigned char inbuf[16];
+ char outbuf[sizeof("xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:255.255.255.255/128")];
+ char *cp;
+ int words;
+ u_char *s;
+
+ if (bits < 0 || bits > 128)
+ {
+ errno = EINVAL;
+ return NULL;
+ }
+
+ cp = outbuf;
+
+ if (bits == 0)
+ {
+ *cp++ = ':';
+ *cp++ = ':';
+ *cp = '\0';
+ }
+ else
+ {
+ /* Copy src to private buffer. Zero host part. */
+ p = (bits + 7) / 8;
+ memcpy(inbuf, src, p);
+ memset(inbuf + p, 0, 16 - p);
+ b = bits % 8;
+ if (b != 0)
+ {
+ m = ((u_int) ~0) << (8 - b);
+ inbuf[p - 1] &= m;
+ }
+
+ s = inbuf;
+
+ /* how many words need to be displayed in output */
+ words = (bits + 15) / 16;
+ if (words == 1)
+ words = 2;
+
+ /* Find the longest substring of zero's */
+ zero_s = zero_l = tmp_zero_s = tmp_zero_l = 0;
+ for (i = 0; i < (words * 2); i += 2)
+ {
+ if ((s[i] | s[i + 1]) == 0)
+ {
+ if (tmp_zero_l == 0)
+ tmp_zero_s = i / 2;
+ tmp_zero_l++;
+ }
+ else
+ {
+ if (tmp_zero_l && zero_l < tmp_zero_l)
+ {
+ zero_s = tmp_zero_s;
+ zero_l = tmp_zero_l;
+ tmp_zero_l = 0;
+ }
+ }
+ }
+
+ if (tmp_zero_l && zero_l < tmp_zero_l)
+ {
+ zero_s = tmp_zero_s;
+ zero_l = tmp_zero_l;
+ }
+
+ if (zero_l != words && zero_s == 0 && ((zero_l == 6) ||
+ ((zero_l == 5 && s[10] == 0xff && s[11] == 0xff) ||
+ ((zero_l == 7 && s[14] != 0 && s[15] != 1)))))
+ is_ipv4 = 1;
+
+ /* Format whole words. */
+ for (p = 0; p < words; p++)
+ {
+ if (zero_l != 0 && p >= zero_s && p < zero_s + zero_l)
+ {
+ /* Time to skip some zeros */
+ if (p == zero_s)
+ *cp++ = ':';
+ if (p == words - 1)
+ *cp++ = ':';
+ s++;
+ s++;
+ continue;
+ }
+
+ if (is_ipv4 && p > 5)
+ {
+ *cp++ = (p == 6) ? ':' : '.';
+ cp += SPRINTF((cp, "%u", *s++));
+ /* we can potentially drop the last octet */
+ if (p != 7 || bits > 120)
+ {
+ *cp++ = '.';
+ cp += SPRINTF((cp, "%u", *s++));
+ }
+ }
+ else
+ {
+ if (cp != outbuf)
+ *cp++ = ':';
+ cp += SPRINTF((cp, "%x", *s * 256 + s[1]));
+ s += 2;
+ }
+ }
+ }
+ /* Format CIDR /width. */
+ (void) SPRINTF((cp, "/%u", bits));
+ if (strlen(outbuf) + 1 > size)
+ goto emsgsize;
+ strcpy(dst, outbuf);
+
+ return dst;
+
+emsgsize:
+ errno = EMSGSIZE;
+ return NULL;
+}