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Diffstat (limited to 'src/backend/utils/adt/inet_net_ntop.c')
-rw-r--r--src/backend/utils/adt/inet_net_ntop.c288
1 files changed, 283 insertions, 5 deletions
diff --git a/src/backend/utils/adt/inet_net_ntop.c b/src/backend/utils/adt/inet_net_ntop.c
index 1cf0dcec2bd..a355e402cb2 100644
--- a/src/backend/utils/adt/inet_net_ntop.c
+++ b/src/backend/utils/adt/inet_net_ntop.c
@@ -16,7 +16,7 @@
*/
#if defined(LIBC_SCCS) && !defined(lint)
-static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.12 2002/09/02 02:47:04 momjian Exp $";
+static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.13 2003/06/24 22:21:22 momjian Exp $";
#endif
#include "postgres.h"
@@ -27,8 +27,12 @@ static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.12 2002/09/02 02:47:04 mom
#include <errno.h>
+#include "utils/inet.h"
#include "utils/builtins.h"
+#define NS_IN6ADDRSZ 16
+#define NS_INT16SZ 2
+
#ifdef SPRINTF_CHAR
#define SPRINTF(x) strlen(sprintf/**/x)
#else
@@ -36,9 +40,13 @@ static const char rcsid[] = "$Id: inet_net_ntop.c,v 1.12 2002/09/02 02:47:04 mom
#endif
static char *inet_net_ntop_ipv4(const u_char *src, int bits,
- char *dst, size_t size);
+ char *dst, size_t size);
static char *inet_cidr_ntop_ipv4(const u_char *src, int bits,
- char *dst, size_t size);
+ char *dst, size_t size);
+static char *inet_net_ntop_ipv6(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 *
@@ -55,8 +63,10 @@ inet_cidr_ntop(int af, const void *src, int bits, char *dst, size_t size)
{
switch (af)
{
- case AF_INET:
+ 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);
@@ -136,6 +146,148 @@ emsgsize:
return (NULL);
}
+/*
+ * static char *
+ * inet_net_ntop_ipv6(src, bits, fakebits, 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;
+ int double_colon = 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;
+ double_colon = 0;
+
+ if (bits == 0) {
+ *cp++ = ':';
+ *cp++ = ':';
+ *cp = '\0';
+ double_colon = 1;
+ } 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 = ~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++ = ':';
+ double_colon = 1;
+ }
+ 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;
+ }
+ }
+ }
+
+ if (!double_colon) {
+ if (bits < 128 - 32)
+ cp += SPRINTF((cp, "::", bits));
+ else if (bits < 128 - 16)
+ cp += SPRINTF((cp, ":0", bits));
+ }
+
+ /* Format CIDR /width. */
+ SPRINTF((cp, "/%u", bits));
+
+ if (strlen(outbuf) + 1 > size)
+ goto emsgsize;
+ strcpy(dst, outbuf);
+
+ return (dst);
+
+emsgsize:
+ errno = EMSGSIZE;
+ return (NULL);
+}
/*
* char *
@@ -156,8 +308,10 @@ inet_net_ntop(int af, const void *src, int bits, char *dst, size_t size)
{
switch (af)
{
- case AF_INET:
+ case PGSQL_AF_INET:
return (inet_net_ntop_ipv4(src, bits, dst, size));
+ case PGSQL_AF_INET6:
+ return (inet_net_ntop_ipv6(src, bits, dst, size));
default:
errno = EAFNOSUPPORT;
return (NULL);
@@ -217,3 +371,127 @@ emsgsize:
errno = EMSGSIZE;
return (NULL);
}
+
+static int
+decoct(const u_char *src, int bytes, char *dst, size_t size) {
+ char *odst = dst;
+ char *t;
+ int b;
+
+ for (b = 1; b <= bytes; b++) {
+ if (size < sizeof "255.")
+ return (0);
+ t = dst;
+ dst += SPRINTF((dst, "%u", *src++));
+ if (b != bytes) {
+ *dst++ = '.';
+ *dst = '\0';
+ }
+ size -= (size_t)(dst - t);
+ }
+ return (dst - odst);
+}
+
+static char *
+inet_net_ntop_ipv6(const u_char *src, int bits, char *dst, size_t size)
+{
+ /*
+ * Note that int32_t and int16_t need only be "at least" large enough
+ * to contain a value of the specified size. On some systems, like
+ * Crays, there is no such thing as an integer variable with 16 bits.
+ * Keep this in mind if you think this function should have been coded
+ * to use pointer overlays. All the world's not a VAX.
+ */
+ char tmp[sizeof "ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255/128"];
+ char *tp;
+ struct { int base, len; } best, cur;
+ u_int words[NS_IN6ADDRSZ / NS_INT16SZ];
+ int i;
+
+ if ((bits < -1) || (bits > 128)) {
+ errno = EINVAL;
+ return (NULL);
+ }
+
+ /*
+ * Preprocess:
+ * Copy the input (bytewise) array into a wordwise array.
+ * Find the longest run of 0x00's in src[] for :: shorthanding.
+ */
+ memset(words, '\0', sizeof words);
+ for (i = 0; i < NS_IN6ADDRSZ; i++)
+ words[i / 2] |= (src[i] << ((1 - (i % 2)) << 3));
+ best.base = -1;
+ cur.base = -1;
+ for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
+ if (words[i] == 0) {
+ if (cur.base == -1)
+ cur.base = i, cur.len = 1;
+ else
+ cur.len++;
+ } else {
+ if (cur.base != -1) {
+ if (best.base == -1 || cur.len > best.len)
+ best = cur;
+ cur.base = -1;
+ }
+ }
+ }
+ if (cur.base != -1) {
+ if (best.base == -1 || cur.len > best.len)
+ best = cur;
+ }
+ if (best.base != -1 && best.len < 2)
+ best.base = -1;
+
+ /*
+ * Format the result.
+ */
+ tp = tmp;
+ for (i = 0; i < (NS_IN6ADDRSZ / NS_INT16SZ); i++) {
+ /* Are we inside the best run of 0x00's? */
+ if (best.base != -1 && i >= best.base &&
+ i < (best.base + best.len)) {
+ if (i == best.base)
+ *tp++ = ':';
+ continue;
+ }
+ /* Are we following an initial run of 0x00s or any real hex? */
+ if (i != 0)
+ *tp++ = ':';
+ /* Is this address an encapsulated IPv4? */
+ if (i == 6 && best.base == 0 && (best.len == 6 ||
+ (best.len == 7 && words[7] != 0x0001) ||
+ (best.len == 5 && words[5] == 0xffff))) {
+ int n;
+
+ n = decoct(src+12, 4, tp, sizeof tmp - (tp - tmp));
+ if (n == 0) {
+ errno = EMSGSIZE;
+ return (NULL);
+ }
+ tp += strlen(tp);
+ break;
+ }
+ tp += SPRINTF((tp, "%x", words[i]));
+ }
+
+ /* Was it a trailing run of 0x00's? */
+ if (best.base != -1 && (best.base + best.len) ==
+ (NS_IN6ADDRSZ / NS_INT16SZ))
+ *tp++ = ':';
+ *tp = '\0';
+
+ if (bits != -1 && bits != 128)
+ tp += SPRINTF((tp, "/%u", bits));
+
+ /*
+ * Check for overflow, copy, and we're done.
+ */
+ if ((size_t)(tp - tmp) > size) {
+ errno = EMSGSIZE;
+ return (NULL);
+ }
+ strcpy(dst, tmp);
+ return (dst);
+}
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