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7559d8ebfa
Backpatch-through: update all files in master, backpatch legal files through 9.4
595 lines
13 KiB
C
595 lines
13 KiB
C
/*-------------------------------------------------------------------------
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*
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* ifaddr.c
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* IP netmask calculations, and enumerating network interfaces.
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*
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* Portions Copyright (c) 1996-2020, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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*
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* IDENTIFICATION
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* src/backend/libpq/ifaddr.c
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*
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* This file and the IPV6 implementation were initially provided by
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* Nigel Kukard <nkukard@lbsd.net>, Linux Based Systems Design
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* http://www.lbsd.net.
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include <unistd.h>
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#include <sys/stat.h>
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#include <sys/socket.h>
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#include <netdb.h>
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#include <netinet/in.h>
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#ifdef HAVE_NETINET_TCP_H
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#include <netinet/tcp.h>
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#endif
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#include <sys/file.h>
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#include "libpq/ifaddr.h"
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#include "port/pg_bswap.h"
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static int range_sockaddr_AF_INET(const struct sockaddr_in *addr,
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const struct sockaddr_in *netaddr,
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const struct sockaddr_in *netmask);
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#ifdef HAVE_IPV6
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static int range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr,
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const struct sockaddr_in6 *netaddr,
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const struct sockaddr_in6 *netmask);
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#endif
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/*
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* pg_range_sockaddr - is addr within the subnet specified by netaddr/netmask ?
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*
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* Note: caller must already have verified that all three addresses are
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* in the same address family; and AF_UNIX addresses are not supported.
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*/
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int
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pg_range_sockaddr(const struct sockaddr_storage *addr,
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const struct sockaddr_storage *netaddr,
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const struct sockaddr_storage *netmask)
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{
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if (addr->ss_family == AF_INET)
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return range_sockaddr_AF_INET((const struct sockaddr_in *) addr,
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(const struct sockaddr_in *) netaddr,
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(const struct sockaddr_in *) netmask);
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#ifdef HAVE_IPV6
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else if (addr->ss_family == AF_INET6)
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return range_sockaddr_AF_INET6((const struct sockaddr_in6 *) addr,
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(const struct sockaddr_in6 *) netaddr,
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(const struct sockaddr_in6 *) netmask);
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#endif
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else
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return 0;
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}
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static int
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range_sockaddr_AF_INET(const struct sockaddr_in *addr,
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const struct sockaddr_in *netaddr,
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const struct sockaddr_in *netmask)
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{
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if (((addr->sin_addr.s_addr ^ netaddr->sin_addr.s_addr) &
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netmask->sin_addr.s_addr) == 0)
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return 1;
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else
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return 0;
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}
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#ifdef HAVE_IPV6
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static int
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range_sockaddr_AF_INET6(const struct sockaddr_in6 *addr,
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const struct sockaddr_in6 *netaddr,
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const struct sockaddr_in6 *netmask)
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{
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int i;
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for (i = 0; i < 16; i++)
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{
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if (((addr->sin6_addr.s6_addr[i] ^ netaddr->sin6_addr.s6_addr[i]) &
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netmask->sin6_addr.s6_addr[i]) != 0)
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return 0;
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}
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return 1;
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}
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#endif /* HAVE_IPV6 */
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/*
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* pg_sockaddr_cidr_mask - make a network mask of the appropriate family
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* and required number of significant bits
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*
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* numbits can be null, in which case the mask is fully set.
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*
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* The resulting mask is placed in *mask, which had better be big enough.
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*
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* Return value is 0 if okay, -1 if not.
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*/
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int
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pg_sockaddr_cidr_mask(struct sockaddr_storage *mask, char *numbits, int family)
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{
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long bits;
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char *endptr;
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if (numbits == NULL)
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{
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bits = (family == AF_INET) ? 32 : 128;
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}
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else
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{
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bits = strtol(numbits, &endptr, 10);
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if (*numbits == '\0' || *endptr != '\0')
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return -1;
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}
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switch (family)
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{
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case AF_INET:
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{
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struct sockaddr_in mask4;
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long maskl;
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if (bits < 0 || bits > 32)
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return -1;
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memset(&mask4, 0, sizeof(mask4));
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/* avoid "x << 32", which is not portable */
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if (bits > 0)
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maskl = (0xffffffffUL << (32 - (int) bits))
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& 0xffffffffUL;
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else
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maskl = 0;
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mask4.sin_addr.s_addr = pg_hton32(maskl);
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memcpy(mask, &mask4, sizeof(mask4));
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break;
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}
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#ifdef HAVE_IPV6
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case AF_INET6:
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{
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struct sockaddr_in6 mask6;
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int i;
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if (bits < 0 || bits > 128)
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return -1;
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memset(&mask6, 0, sizeof(mask6));
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for (i = 0; i < 16; i++)
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{
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if (bits <= 0)
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mask6.sin6_addr.s6_addr[i] = 0;
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else if (bits >= 8)
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mask6.sin6_addr.s6_addr[i] = 0xff;
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else
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{
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mask6.sin6_addr.s6_addr[i] =
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(0xff << (8 - (int) bits)) & 0xff;
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}
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bits -= 8;
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}
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memcpy(mask, &mask6, sizeof(mask6));
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break;
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}
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#endif
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default:
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return -1;
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}
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mask->ss_family = family;
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return 0;
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}
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/*
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* Run the callback function for the addr/mask, after making sure the
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* mask is sane for the addr.
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*/
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static void
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run_ifaddr_callback(PgIfAddrCallback callback, void *cb_data,
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struct sockaddr *addr, struct sockaddr *mask)
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{
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struct sockaddr_storage fullmask;
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if (!addr)
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return;
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/* Check that the mask is valid */
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if (mask)
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{
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if (mask->sa_family != addr->sa_family)
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{
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mask = NULL;
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}
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else if (mask->sa_family == AF_INET)
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{
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if (((struct sockaddr_in *) mask)->sin_addr.s_addr == INADDR_ANY)
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mask = NULL;
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}
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#ifdef HAVE_IPV6
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else if (mask->sa_family == AF_INET6)
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{
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if (IN6_IS_ADDR_UNSPECIFIED(&((struct sockaddr_in6 *) mask)->sin6_addr))
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mask = NULL;
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}
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#endif
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}
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/* If mask is invalid, generate our own fully-set mask */
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if (!mask)
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{
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pg_sockaddr_cidr_mask(&fullmask, NULL, addr->sa_family);
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mask = (struct sockaddr *) &fullmask;
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}
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(*callback) (addr, mask, cb_data);
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}
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#ifdef WIN32
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#include <winsock2.h>
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#include <ws2tcpip.h>
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/*
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* Enumerate the system's network interface addresses and call the callback
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* for each one. Returns 0 if successful, -1 if trouble.
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*
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* This version is for Win32. Uses the Winsock 2 functions (ie: ws2_32.dll)
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*/
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int
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pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
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{
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INTERFACE_INFO *ptr,
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*ii = NULL;
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unsigned long length,
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i;
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unsigned long n_ii = 0;
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SOCKET sock;
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int error;
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sock = WSASocket(AF_INET, SOCK_DGRAM, 0, 0, 0, 0);
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if (sock == INVALID_SOCKET)
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return -1;
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while (n_ii < 1024)
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{
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n_ii += 64;
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ptr = realloc(ii, sizeof(INTERFACE_INFO) * n_ii);
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if (!ptr)
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{
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free(ii);
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closesocket(sock);
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errno = ENOMEM;
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return -1;
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}
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ii = ptr;
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if (WSAIoctl(sock, SIO_GET_INTERFACE_LIST, 0, 0,
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ii, n_ii * sizeof(INTERFACE_INFO),
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&length, 0, 0) == SOCKET_ERROR)
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{
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error = WSAGetLastError();
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if (error == WSAEFAULT || error == WSAENOBUFS)
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continue; /* need to make the buffer bigger */
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closesocket(sock);
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free(ii);
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return -1;
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}
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break;
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}
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for (i = 0; i < length / sizeof(INTERFACE_INFO); ++i)
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run_ifaddr_callback(callback, cb_data,
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(struct sockaddr *) &ii[i].iiAddress,
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(struct sockaddr *) &ii[i].iiNetmask);
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closesocket(sock);
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free(ii);
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return 0;
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}
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#elif HAVE_GETIFADDRS /* && !WIN32 */
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#ifdef HAVE_IFADDRS_H
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#include <ifaddrs.h>
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#endif
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/*
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* Enumerate the system's network interface addresses and call the callback
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* for each one. Returns 0 if successful, -1 if trouble.
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*
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* This version uses the getifaddrs() interface, which is available on
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* BSDs, AIX, and modern Linux.
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*/
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int
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pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
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{
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struct ifaddrs *ifa,
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*l;
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if (getifaddrs(&ifa) < 0)
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return -1;
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for (l = ifa; l; l = l->ifa_next)
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run_ifaddr_callback(callback, cb_data,
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l->ifa_addr, l->ifa_netmask);
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freeifaddrs(ifa);
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return 0;
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}
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#else /* !HAVE_GETIFADDRS && !WIN32 */
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#include <sys/ioctl.h>
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#ifdef HAVE_NET_IF_H
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#include <net/if.h>
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#endif
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#ifdef HAVE_SYS_SOCKIO_H
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#include <sys/sockio.h>
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#endif
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/*
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* SIOCGIFCONF does not return IPv6 addresses on Solaris
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* and HP/UX. So we prefer SIOCGLIFCONF if it's available.
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*
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* On HP/UX, however, it *only* returns IPv6 addresses,
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* and the structs are named slightly differently too.
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* We'd have to do another call with SIOCGIFCONF to get the
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* IPv4 addresses as well. We don't currently bother, just
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* fall back to SIOCGIFCONF on HP/UX.
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*/
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#if defined(SIOCGLIFCONF) && !defined(__hpux)
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/*
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* Enumerate the system's network interface addresses and call the callback
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* for each one. Returns 0 if successful, -1 if trouble.
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*
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* This version uses ioctl(SIOCGLIFCONF).
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*/
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int
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pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
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{
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struct lifconf lifc;
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struct lifreq *lifr,
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lmask;
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struct sockaddr *addr,
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*mask;
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char *ptr,
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*buffer = NULL;
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size_t n_buffer = 1024;
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pgsocket sock,
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fd;
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#ifdef HAVE_IPV6
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pgsocket sock6;
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#endif
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int i,
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total;
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock == PGINVALID_SOCKET)
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return -1;
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while (n_buffer < 1024 * 100)
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{
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n_buffer += 1024;
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ptr = realloc(buffer, n_buffer);
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if (!ptr)
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{
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free(buffer);
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close(sock);
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errno = ENOMEM;
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return -1;
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}
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memset(&lifc, 0, sizeof(lifc));
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lifc.lifc_family = AF_UNSPEC;
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lifc.lifc_buf = buffer = ptr;
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lifc.lifc_len = n_buffer;
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if (ioctl(sock, SIOCGLIFCONF, &lifc) < 0)
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{
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if (errno == EINVAL)
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continue;
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free(buffer);
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close(sock);
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return -1;
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}
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/*
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* Some Unixes try to return as much data as possible, with no
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* indication of whether enough space allocated. Don't believe we have
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* it all unless there's lots of slop.
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*/
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if (lifc.lifc_len < n_buffer - 1024)
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break;
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}
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#ifdef HAVE_IPV6
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/* We'll need an IPv6 socket too for the SIOCGLIFNETMASK ioctls */
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sock6 = socket(AF_INET6, SOCK_DGRAM, 0);
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if (sock6 == PGINVALID_SOCKET)
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{
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free(buffer);
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close(sock);
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return -1;
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}
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#endif
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total = lifc.lifc_len / sizeof(struct lifreq);
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lifr = lifc.lifc_req;
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for (i = 0; i < total; ++i)
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{
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addr = (struct sockaddr *) &lifr[i].lifr_addr;
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memcpy(&lmask, &lifr[i], sizeof(struct lifreq));
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#ifdef HAVE_IPV6
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fd = (addr->sa_family == AF_INET6) ? sock6 : sock;
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#else
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fd = sock;
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#endif
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if (ioctl(fd, SIOCGLIFNETMASK, &lmask) < 0)
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mask = NULL;
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else
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mask = (struct sockaddr *) &lmask.lifr_addr;
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run_ifaddr_callback(callback, cb_data, addr, mask);
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}
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free(buffer);
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close(sock);
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#ifdef HAVE_IPV6
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close(sock6);
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#endif
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return 0;
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}
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#elif defined(SIOCGIFCONF)
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/*
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* Remaining Unixes use SIOCGIFCONF. Some only return IPv4 information
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* here, so this is the least preferred method. Note that there is no
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* standard way to iterate the struct ifreq returned in the array.
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* On some OSs the structures are padded large enough for any address,
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* on others you have to calculate the size of the struct ifreq.
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*/
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/* Some OSs have _SIZEOF_ADDR_IFREQ, so just use that */
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#ifndef _SIZEOF_ADDR_IFREQ
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/* Calculate based on sockaddr.sa_len */
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#ifdef HAVE_STRUCT_SOCKADDR_SA_LEN
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#define _SIZEOF_ADDR_IFREQ(ifr) \
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((ifr).ifr_addr.sa_len > sizeof(struct sockaddr) ? \
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(sizeof(struct ifreq) - sizeof(struct sockaddr) + \
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(ifr).ifr_addr.sa_len) : sizeof(struct ifreq))
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/* Padded ifreq structure, simple */
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#else
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#define _SIZEOF_ADDR_IFREQ(ifr) \
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sizeof (struct ifreq)
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#endif
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#endif /* !_SIZEOF_ADDR_IFREQ */
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/*
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* Enumerate the system's network interface addresses and call the callback
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* for each one. Returns 0 if successful, -1 if trouble.
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*
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* This version uses ioctl(SIOCGIFCONF).
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*/
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int
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pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
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{
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struct ifconf ifc;
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struct ifreq *ifr,
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*end,
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addr,
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mask;
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char *ptr,
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*buffer = NULL;
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size_t n_buffer = 1024;
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pgsocket sock;
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sock = socket(AF_INET, SOCK_DGRAM, 0);
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if (sock == PGINVALID_SOCKET)
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return -1;
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while (n_buffer < 1024 * 100)
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{
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n_buffer += 1024;
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ptr = realloc(buffer, n_buffer);
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if (!ptr)
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{
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free(buffer);
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close(sock);
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errno = ENOMEM;
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return -1;
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}
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memset(&ifc, 0, sizeof(ifc));
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ifc.ifc_buf = buffer = ptr;
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ifc.ifc_len = n_buffer;
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if (ioctl(sock, SIOCGIFCONF, &ifc) < 0)
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{
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if (errno == EINVAL)
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continue;
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free(buffer);
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close(sock);
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return -1;
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}
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/*
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* Some Unixes try to return as much data as possible, with no
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* indication of whether enough space allocated. Don't believe we have
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* it all unless there's lots of slop.
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*/
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if (ifc.ifc_len < n_buffer - 1024)
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break;
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}
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end = (struct ifreq *) (buffer + ifc.ifc_len);
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for (ifr = ifc.ifc_req; ifr < end;)
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{
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memcpy(&addr, ifr, sizeof(addr));
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memcpy(&mask, ifr, sizeof(mask));
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if (ioctl(sock, SIOCGIFADDR, &addr, sizeof(addr)) == 0 &&
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ioctl(sock, SIOCGIFNETMASK, &mask, sizeof(mask)) == 0)
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run_ifaddr_callback(callback, cb_data,
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&addr.ifr_addr, &mask.ifr_addr);
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ifr = (struct ifreq *) ((char *) ifr + _SIZEOF_ADDR_IFREQ(*ifr));
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}
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free(buffer);
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close(sock);
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return 0;
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}
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#else /* !defined(SIOCGIFCONF) */
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/*
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* Enumerate the system's network interface addresses and call the callback
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* for each one. Returns 0 if successful, -1 if trouble.
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*
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* This version is our fallback if there's no known way to get the
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* interface addresses. Just return the standard loopback addresses.
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*/
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|
int
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pg_foreach_ifaddr(PgIfAddrCallback callback, void *cb_data)
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|
{
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|
struct sockaddr_in addr;
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|
struct sockaddr_storage mask;
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|
|
|
#ifdef HAVE_IPV6
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|
struct sockaddr_in6 addr6;
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#endif
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|
|
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/* addr 127.0.0.1/8 */
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memset(&addr, 0, sizeof(addr));
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addr.sin_family = AF_INET;
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addr.sin_addr.s_addr = pg_ntoh32(0x7f000001);
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memset(&mask, 0, sizeof(mask));
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pg_sockaddr_cidr_mask(&mask, "8", AF_INET);
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|
run_ifaddr_callback(callback, cb_data,
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|
(struct sockaddr *) &addr,
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|
(struct sockaddr *) &mask);
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|
|
|
#ifdef HAVE_IPV6
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|
/* addr ::1/128 */
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|
memset(&addr6, 0, sizeof(addr6));
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|
addr6.sin6_family = AF_INET6;
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|
addr6.sin6_addr.s6_addr[15] = 1;
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|
memset(&mask, 0, sizeof(mask));
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|
pg_sockaddr_cidr_mask(&mask, "128", AF_INET6);
|
|
run_ifaddr_callback(callback, cb_data,
|
|
(struct sockaddr *) &addr6,
|
|
(struct sockaddr *) &mask);
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|
#endif
|
|
|
|
return 0;
|
|
}
|
|
#endif /* !defined(SIOCGIFCONF) */
|
|
|
|
#endif /* !HAVE_GETIFADDRS */
|