Files
openGauss-server/contrib/gtm/client/ip.cpp
2020-06-30 17:38:27 +08:00

314 lines
9.1 KiB
C++

/* -------------------------------------------------------------------------
*
* ip.c
* IPv6-aware network access.
*
* Portions Copyright (c) 1996-2009, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
* Portions Copyright (c) 2010-2012 Postgres-XC Development Group
*
*
* IDENTIFICATION
* $PostgreSQL: pgsql/src/backend/libpq/ip.c,v 1.43 2009/01/01 17:23:42 momjian Exp $
*
* This file and the IPV6 implementation were initially provided by
* Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
* http://www.lbsd.net.
*
* -------------------------------------------------------------------------
*/
/* This is intended to be used in both frontend and backend, so use c.h */
#include "gtm/gtm_c.h"
#include <unistd.h>
#include <sys/types.h>
#include <sys/stat.h>
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#ifdef HAVE_NETINET_TCP_H
#include <netinet/tcp.h>
#endif
#include <arpa/inet.h>
#include <sys/file.h>
#include "gtm/gtm_ip.h"
static int range_sockaddr_AF_INET(
const struct sockaddr_in* addr, const struct sockaddr_in* netaddr, const struct sockaddr_in* netmask);
#ifdef HAVE_IPV6
static int range_sockaddr_AF_INET6(
const struct sockaddr_in6* addr, const struct sockaddr_in6* netaddr, const struct sockaddr_in6* netmask);
#endif
/*
* gtm_getaddrinfo_all - get address info for Unix, IPv4 and IPv6 sockets
*/
int gtm_getaddrinfo_all(
const char* hostname, const char* servname, const struct addrinfo* hintp, struct addrinfo** result)
{
int rc;
/* not all versions of getaddrinfo() zero *result on failure */
*result = NULL;
/* NULL has special meaning to getaddrinfo(). */
rc = getaddrinfo((!hostname || hostname[0] == '\0') ? NULL : hostname, servname, hintp, result);
return rc;
}
/*
* gtm_freeaddrinfo_all - free addrinfo structures for IPv4, IPv6, or Unix
*
* Note: the ai_family field of the original hint structure must be passed
* so that we can tell whether the addrinfo struct was built by the system's
* getaddrinfo() routine or our own getaddrinfo_unix() routine. Some versions
* of getaddrinfo() might be willing to return AF_UNIX addresses, so it's
* not safe to look at ai_family in the addrinfo itself.
*/
void gtm_freeaddrinfo_all(int hint_ai_family, struct addrinfo* ai)
{
{
/* struct was built by getaddrinfo() */
if (ai != NULL) {
freeaddrinfo(ai);
}
}
}
/*
* gtm_getnameinfo_all - get name info for Unix, IPv4 and IPv6 sockets
*
* The API of this routine differs from the standard getnameinfo() definition
* in two ways: first, the addr parameter is declared as sockaddr_storage
* rather than struct sockaddr, and second, the node and service fields are
* guaranteed to be filled with something even on failure return.
*/
int gtm_getnameinfo_all(
const struct sockaddr_storage* addr, int salen, char* node, int nodelen, char* service, int servicelen, int flags)
{
int rc;
rc = getnameinfo((const struct sockaddr*)addr, salen, node, nodelen, service, servicelen, flags);
if (rc != 0) {
if (node) {
strlcpy(node, "???", nodelen);
}
if (service) {
strlcpy(service, "???", servicelen);
}
}
return rc;
}
/*
* gtm_range_sockaddr - is addr within the subnet specified by netaddr/netmask ?
*
* Note: caller must already have verified that all three addresses are
* in the same address family; and AF_UNIX addresses are not supported.
*/
int gtm_range_sockaddr(
const struct sockaddr_storage* addr, const struct sockaddr_storage* netaddr, const struct sockaddr_storage* netmask)
{
if (addr->ss_family == AF_INET) {
return range_sockaddr_AF_INET(
(struct sockaddr_in*)addr, (struct sockaddr_in*)netaddr, (struct sockaddr_in*)netmask);
#ifdef HAVE_IPV6
else if (addr->ss_family == AF_INET6) {
return range_sockaddr_AF_INET6(
(struct sockaddr_in6*)addr, (struct sockaddr_in6*)netaddr, (struct sockaddr_in6*)netmask);
#endif
} else {
return 0;
}
}
static int range_sockaddr_AF_INET(
const struct sockaddr_in* addr, const struct sockaddr_in* netaddr, const struct sockaddr_in* netmask)
{
if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) & netmask->sin_addr.s_addr) == 0) {
return 1;
} else {
return 0;
}
}
#ifdef HAVE_IPV6
static int range_sockaddr_AF_INET6(
const struct sockaddr_in6* addr, const struct sockaddr_in6* netaddr, const struct sockaddr_in6* netmask)
{
int i;
for (i = 0; i < 16; i++) {
if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) & netmask->sin6_addr.s6_addr[i]) != 0)
return 0;
}
return 1;
}
#endif /* HAVE_IPV6 */
/*
* gtm_sockaddr_cidr_mask - make a network mask of the appropriate family
* and required number of significant bits
*
* The resulting mask is placed in *mask, which had better be big enough.
*
* Return value is 0 if okay, -1 if not.
*/
int gtm_sockaddr_cidr_mask(struct sockaddr_storage* mask, char* numbits, int family)
{
long bits;
char* endptr;
errno_t rc = EOK;
bits = strtol(numbits, &endptr, 10);
if (*numbits == '\0' || *endptr != '\0') {
return -1;
}
switch (family) {
case AF_INET: {
struct sockaddr_in mask4;
long maskl;
if (bits < 0 || bits > 32) {
return -1;
}
/* avoid "x << 32", which is not portable */
if (bits > 0) {
maskl = (0xffffffffUL << (32 - (int)bits)) & 0xffffffffUL;
} else {
maskl = 0;
}
mask4.sin_addr.s_addr = htonl(maskl);
rc = memcpy_s(mask, sizeof(mask4), &mask4, sizeof(mask4));
securec_check(rc, "\0", "\0");
break;
}
#ifdef HAVE_IPV6
case AF_INET6: {
struct sockaddr_in6 mask6;
int i;
if (bits < 0 || bits > 128) {
return -1;
}
for (i = 0; i < 16; i++) {
if (bits <= 0) {
mask6.sin6_addr.s6_addr[i] = 0;
} else if (bits >= 8) {
mask6.sin6_addr.s6_addr[i] = 0xff;
} else {
mask6.sin6_addr.s6_addr[i] = (0xff << (8 - (int)bits)) & 0xff;
}
bits -= 8;
}
rc = memcpy_s(mask, sizeof(mask6), &mask6, sizeof(mask6));
securec_check(rc, "\0", "\0");
break;
}
#endif
default:
return -1;
}
mask->ss_family = family;
return 0;
}
#ifdef HAVE_IPV6
/*
* gtm_promote_v4_to_v6_addr --- convert an AF_INET addr to AF_INET6, using
* the standard convention for IPv4 addresses mapped into IPv6 world
*
* The passed addr is modified in place; be sure it is large enough to
* hold the result! Note that we only worry about setting the fields
* that gtm_range_sockaddr will look at.
*/
void gtm_promote_v4_to_v6_addr(struct sockaddr_storage* addr)
{
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
uint32 ip4addr;
errno_t rc = EOK;
rc = memcpy_s(&addr4, sizeof(addr4), addr, sizeof(addr4));
securec_check(rc, "\0", "\0");
ip4addr = ntohl(addr4.sin_addr.s_addr);
rc = memset_s(&addr6, sizeof(addr6), 0, sizeof(addr6));
securec_check(rc, "\0", "\0");
addr6.sin6_family = AF_INET6;
addr6.sin6_addr.s6_addr[10] = 0xff;
addr6.sin6_addr.s6_addr[11] = 0xff;
addr6.sin6_addr.s6_addr[12] = (ip4addr >> 24) & 0xFF;
addr6.sin6_addr.s6_addr[13] = (ip4addr >> 16) & 0xFF;
addr6.sin6_addr.s6_addr[14] = (ip4addr >> 8) & 0xFF;
addr6.sin6_addr.s6_addr[15] = (ip4addr)&0xFF;
rc = memcpy_s(addr, sizeof(addr6), &addr6, sizeof(addr6));
securec_check(rc, "\0", "\0");
}
/*
* gtm_promote_v4_to_v6_mask --- convert an AF_INET netmask to AF_INET6, using
* the standard convention for IPv4 addresses mapped into IPv6 world
*
* This must be different from gtm_promote_v4_to_v6_addr because we want to
* set the high-order bits to 1's not 0's.
*
* The passed addr is modified in place; be sure it is large enough to
* hold the result! Note that we only worry about setting the fields
* that gtm_range_sockaddr will look at.
*/
void gtm_promote_v4_to_v6_mask(struct sockaddr_storage* addr)
{
struct sockaddr_in addr4;
struct sockaddr_in6 addr6;
uint32 ip4addr;
int i;
errno_t rc = EOK;
rc = memcpy_s(&addr4, sizeof(addr4), addr, sizeof(addr4));
securec_check(rc, "\0", "\0");
ip4addr = ntohl(addr4.sin_addr.s_addr);
rc = memset_s(&addr6, sizeof(addr6), 0, sizeof(addr6));
securec_check(rc, "\0", "\0");
addr6.sin6_family = AF_INET6;
for (i = 0; i < 12; i++) {
addr6.sin6_addr.s6_addr[i] = 0xff;
}
addr6.sin6_addr.s6_addr[12] = (ip4addr >> 24) & 0xFF;
addr6.sin6_addr.s6_addr[13] = (ip4addr >> 16) & 0xFF;
addr6.sin6_addr.s6_addr[14] = (ip4addr >> 8) & 0xFF;
addr6.sin6_addr.s6_addr[15] = (ip4addr)&0xFF;
rc = memcpy_s(addr, sizeof(addr6), &addr6, sizeof(addr6));
securec_check(rc, "\0", "\0");
}
#endif /* HAVE_IPV6 */