greenplumn ifaddr 源码
greenplumn ifaddr 代码
文件路径：/src/backend/libpq/ifaddr.c
/*-------------------------------------------------------------------------
*
* ifaddr.c
* IP netmask calculations, and enumerating network interfaces.
*
* Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
* Portions Copyright (c) 1994, Regents of the University of California
*
*
* IDENTIFICATION
* src/backend/libpq/ifaddr.c
*
* This file and the IPV6 implementation were initially provided by
* Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
* http://www.lbsd.net.
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include <unistd.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 <sys/file.h>
#include "libpq/ifaddr.h"
#include "port/pg_bswap.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
/*
* pg_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
pg_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((const struct sockaddr_in *) addr,
(const struct sockaddr_in *) netaddr,
(const struct sockaddr_in *) netmask);
#ifdef HAVE_IPV6
else if (addr->ss_family == AF_INET6)
return range_sockaddr_AF_INET6((const struct sockaddr_in6 *) addr,
(const struct sockaddr_in6 *) netaddr,
(const 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 */
/*
* pg_sockaddr_cidr_mask - make a network mask of the appropriate family
* and required number of significant bits
*
* numbits can be null, in which case the mask is fully set.
*
* The resulting mask is placed in *mask, which had better be big enough.
*
* Return value is 0 if okay, -1 if not.
*/
int
pg_sockaddr_cidr_mask(struct sockaddr_storage *mask, char *numbits, int family)
{
long bits;
char *endptr;
if (numbits == NULL)
{
bits = (family == AF_INET) ? 32 : 128;
}
else
{
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;
memset(&mask4, 0, sizeof(mask4));
/* avoid "x << 32", which is not portable */
if (bits > 0)
maskl = (0xffffffffUL << (32 - (int) bits))
& 0xffffffffUL;
else
maskl = 0;
mask4.sin_addr.s_addr = pg_hton32(maskl);
memcpy(mask, &mask4, sizeof(mask4));
break;
}
#ifdef HAVE_IPV6
case AF_INET6:
{
struct sockaddr_in6 mask6;
int i;
if (bits < 0 || bits > 128)
return -1;
memset(&mask6, 0, sizeof(mask6));
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;
}
memcpy(mask, &mask6, sizeof(mask6));
break;
}
#endif
default:
return -1;
}
mask->ss_family = family;
return 0;
}
/*
* Run the callback function for the addr/mask, after making sure the
* mask is sane for the addr.
*/
static void
run_ifaddr_callback(PgIfAddrCallback callback, void *cb_data,
struct sockaddr *addr, struct sockaddr *mask)
{
struct sockaddr_storage fullmask;
if (!addr)
return;
/* Check that the mask is valid */
if (mask)
{
if (mask->sa_family != addr->sa_family)
{
mask = NULL;
}
else if (mask->sa_family == AF_INET)
{
if (((struct sockaddr_in *) mask)->sin_addr.s_addr == INADDR_ANY)
mask = NULL;
}
#ifdef HAVE_IPV6
else if (mask->sa_family == AF_INET6)
{
if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) mask)->sin6_addr))
mask = NULL;
}
#endif
}
/* If mask is invalid, generate our own fully-set mask */
if (!mask)
{
pg_sockaddr_cidr_mask(&fullmask, NULL, addr->sa_family);
mask = (struct sockaddr *) &fullmask;
}
(*callback) (addr, mask, cb_data);
}
#ifdef WIN32
#include <winsock2.h>
#include <ws2tcpip.h>
/*
* Enumerate the system's network interface addresses and call the callback
* for each one. Returns 0 if successful, -1 if trouble.
*
* This version is for Win32. Uses the Winsock 2 functions (ie: ws2_32.dll)
*/
int
pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
{
INTERFACE_INFO *ptr,
*ii = NULL;
unsigned long length,
i;
unsigned long n_ii = 0;
SOCKET sock;
int error;
sock = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
if (sock == INVALID_SOCKET)
return -1;
while (n_ii < 1024)
{
n_ii += 64;
ptr = realloc(ii, sizeof(INTERFACE_INFO) * n_ii);
if (!ptr)
{
free(ii);
closesocket(sock);
errno = ENOMEM;
return -1;
}
ii = ptr;
if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, 0, 0,
ii, n_ii * sizeof(INTERFACE_INFO),
&length, 0, 0) == SOCKET_ERROR)
{
error = WSAGetLastError();
if (error == WSAEFAULT || error == WSAENOBUFS)
continue; /* need to make the buffer bigger */
closesocket(sock);
free(ii);
return -1;
}
break;
}
for (i = 0; i < length / sizeof(INTERFACE_INFO); ++i)
run_ifaddr_callback(callback, cb_data,
(struct sockaddr *) &ii[i].iiAddress,
(struct sockaddr *) &ii[i].iiNetmask);
closesocket(sock);
free(ii);
return 0;
}
#elif HAVE_GETIFADDRS /* && !WIN32 */
#ifdef HAVE_IFADDRS_H
#include <ifaddrs.h>
#endif
/*
* Enumerate the system's network interface addresses and call the callback
* for each one. Returns 0 if successful, -1 if trouble.
*
* This version uses the getifaddrs() interface, which is available on
* BSDs, AIX, and modern Linux.
*/
int
pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
{
struct ifaddrs *ifa,
*l;
if (getifaddrs(&ifa) < 0)
return -1;
for (l = ifa; l; l = l->ifa_next)
run_ifaddr_callback(callback, cb_data,
l->ifa_addr, l->ifa_netmask);
freeifaddrs(ifa);
return 0;
}
#else /* !HAVE_GETIFADDRS && !WIN32 */
#include <sys/ioctl.h>
#ifdef HAVE_NET_IF_H
#include <net/if.h>
#endif
#ifdef HAVE_SYS_SOCKIO_H
#include <sys/sockio.h>
#endif
/*
* SIOCGIFCONF does not return IPv6 addresses on Solaris
* and HP/UX. So we prefer SIOCGLIFCONF if it's available.
*
* On HP/UX, however, it *only* returns IPv6 addresses,
* and the structs are named slightly differently too.
* We'd have to do another call with SIOCGIFCONF to get the
* IPv4 addresses as well. We don't currently bother, just
* fall back to SIOCGIFCONF on HP/UX.
*/
#if defined(SIOCGLIFCONF) && !defined(__hpux)
/*
* Enumerate the system's network interface addresses and call the callback
* for each one. Returns 0 if successful, -1 if trouble.
*
* This version uses ioctl(SIOCGLIFCONF).
*/
int
pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
{
struct lifconf lifc;
struct lifreq *lifr,
lmask;
struct sockaddr *addr,
*mask;
char *ptr,
*buffer = NULL;
size_t n_buffer = 1024;
pgsocket sock,
fd;
#ifdef HAVE_IPV6
pgsocket sock6;
#endif
int i,
total;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == PGINVALID_SOCKET)
return -1;
while (n_buffer < 1024 * 100)
{
n_buffer += 1024;
ptr = realloc(buffer, n_buffer);
if (!ptr)
{
free(buffer);
close(sock);
errno = ENOMEM;
return -1;
}
memset(&lifc, 0, sizeof(lifc));
lifc.lifc_family = AF_UNSPEC;
lifc.lifc_buf = buffer = ptr;
lifc.lifc_len = n_buffer;
if (ioctl(sock, SIOCGLIFCONF, &lifc) < 0)
{
if (errno == EINVAL)
continue;
free(buffer);
close(sock);
return -1;
}
/*
* Some Unixes try to return as much data as possible, with no
* indication of whether enough space allocated. Don't believe we have
* it all unless there's lots of slop.
*/
if (lifc.lifc_len < n_buffer - 1024)
break;
}
#ifdef HAVE_IPV6
/* We'll need an IPv6 socket too for the SIOCGLIFNETMASK ioctls */
sock6 = socket(AF_INET6, SOCK_DGRAM, 0);
if (sock6 == PGINVALID_SOCKET)
{
free(buffer);
close(sock);
return -1;
}
#endif
total = lifc.lifc_len / sizeof(struct lifreq);
lifr = lifc.lifc_req;
for (i = 0; i < total; ++i)
{
addr = (struct sockaddr *) &lifr[i].lifr_addr;
memcpy(&lmask, &lifr[i], sizeof(struct lifreq));
#ifdef HAVE_IPV6
fd = (addr->sa_family == AF_INET6) ? sock6 : sock;
#else
fd = sock;
#endif
if (ioctl(fd, SIOCGLIFNETMASK, &lmask) < 0)
mask = NULL;
else
mask = (struct sockaddr *) &lmask.lifr_addr;
run_ifaddr_callback(callback, cb_data, addr, mask);
}
free(buffer);
close(sock);
#ifdef HAVE_IPV6
close(sock6);
#endif
return 0;
}
#elif defined(SIOCGIFCONF)
/*
* Remaining Unixes use SIOCGIFCONF. Some only return IPv4 information
* here, so this is the least preferred method. Note that there is no
* standard way to iterate the struct ifreq returned in the array.
* On some OSs the structures are padded large enough for any address,
* on others you have to calculate the size of the struct ifreq.
*/
/* Some OSs have _SIZEOF_ADDR_IFREQ, so just use that */
#ifndef _SIZEOF_ADDR_IFREQ
/* Calculate based on sockaddr.sa_len */
#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
#define _SIZEOF_ADDR_IFREQ(ifr) \
((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
(sizeof(struct ifreq) - sizeof(struct sockaddr) + \
(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
/* Padded ifreq structure, simple */
#else
#define _SIZEOF_ADDR_IFREQ(ifr) \
sizeof (struct ifreq)
#endif
#endif /* !_SIZEOF_ADDR_IFREQ */
/*
* Enumerate the system's network interface addresses and call the callback
* for each one. Returns 0 if successful, -1 if trouble.
*
* This version uses ioctl(SIOCGIFCONF).
*/
int
pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
{
struct ifconf ifc;
struct ifreq *ifr,
*end,
addr,
mask;
char *ptr,
*buffer = NULL;
size_t n_buffer = 1024;
pgsocket sock;
sock = socket(AF_INET, SOCK_DGRAM, 0);
if (sock == PGINVALID_SOCKET)
return -1;
while (n_buffer < 1024 * 100)
{
n_buffer += 1024;
ptr = realloc(buffer, n_buffer);
if (!ptr)
{
free(buffer);
close(sock);
errno = ENOMEM;
return -1;
}
memset(&ifc, 0, sizeof(ifc));
ifc.ifc_buf = buffer = ptr;
ifc.ifc_len = n_buffer;
if (ioctl(sock, SIOCGIFCONF, &ifc) < 0)
{
if (errno == EINVAL)
continue;
free(buffer);
close(sock);
return -1;
}
/*
* Some Unixes try to return as much data as possible, with no
* indication of whether enough space allocated. Don't believe we have
* it all unless there's lots of slop.
*/
if (ifc.ifc_len < n_buffer - 1024)
break;
}
end = (struct ifreq *) (buffer + ifc.ifc_len);
for (ifr = ifc.ifc_req; ifr < end;)
{
memcpy(&addr, ifr, sizeof(addr));
memcpy(&mask, ifr, sizeof(mask));
if (ioctl(sock, SIOCGIFADDR, &addr, sizeof(addr)) == 0 &&
ioctl(sock, SIOCGIFNETMASK, &mask, sizeof(mask)) == 0)
run_ifaddr_callback(callback, cb_data,
&addr.ifr_addr, &mask.ifr_addr);
ifr = (struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr));
}
free(buffer);
close(sock);
return 0;
}
#else /* !defined(SIOCGIFCONF) */
/*
* Enumerate the system's network interface addresses and call the callback
* for each one. Returns 0 if successful, -1 if trouble.
*
* This version is our fallback if there's no known way to get the
* interface addresses. Just return the standard loopback addresses.
*/
int
pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
{
struct sockaddr_in addr;
struct sockaddr_storage mask;
#ifdef HAVE_IPV6
struct sockaddr_in6 addr6;
#endif
/* addr 127.0.0.1/8 */
memset(&addr, 0, sizeof(addr));
addr.sin_family = AF_INET;
addr.sin_addr.s_addr = pg_ntoh32(0x7f000001);
memset(&mask, 0, sizeof(mask));
pg_sockaddr_cidr_mask(&mask, "8", AF_INET);
run_ifaddr_callback(callback, cb_data,
(struct sockaddr *) &addr,
(struct sockaddr *) &mask);
#ifdef HAVE_IPV6
/* addr ::1/128 */
memset(&addr6, 0, sizeof(addr6));
addr6.sin6_family = AF_INET6;
addr6.sin6_addr.s6_addr[15] = 1;
memset(&mask, 0, sizeof(mask));
pg_sockaddr_cidr_mask(&mask, "128", AF_INET6);
run_ifaddr_callback(callback, cb_data,
(struct sockaddr *) &addr6,
(struct sockaddr *) &mask);
#endif
return 0;
}
#endif /* !defined(SIOCGIFCONF) */
#endif /* !HAVE_GETIFADDRS */
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