diff options
Diffstat (limited to 'lib/isc/win32/interfaceiter.c')
| -rw-r--r-- | lib/isc/win32/interfaceiter.c | 807 |
1 files changed, 807 insertions, 0 deletions
diff --git a/lib/isc/win32/interfaceiter.c b/lib/isc/win32/interfaceiter.c new file mode 100644 index 0000000..8753aa8 --- /dev/null +++ b/lib/isc/win32/interfaceiter.c @@ -0,0 +1,807 @@ +/* + * Copyright (C) 2004, 2007-2009 Internet Systems Consortium, Inc. ("ISC") + * Copyright (C) 1999-2001 Internet Software Consortium. + * + * Permission to use, copy, modify, and/or 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. + */ + +/* $Id: interfaceiter.c,v 1.15 2009/01/18 23:48:14 tbox Exp $ */ + +#include <config.h> + +#include <stdio.h> +#include <stdlib.h> +#include <errno.h> +#include <sys/types.h> +#include <winsock2.h> +#include <ws2tcpip.h> +#include <gaa_compat.h> + +#include <isc/interfaceiter.h> +#include <isc/mem.h> +#include <isc/result.h> +#include <isc/string.h> +#include <isc/strerror.h> +#include <isc/types.h> +#include <isc/util.h> +#include <isc/win32os.h> + +void InitSockets(void); + + +#define IFITER_MAGIC 0x49464954U /* IFIT. */ +#define VALID_IFITER(t) ((t) != NULL && (t)->magic == IFITER_MAGIC) + +struct isc_interfaceiter { + unsigned int magic; /* Magic number. */ + /* common fields */ + isc_mem_t *mctx; + isc_interface_t current; /* Current interface data. */ + isc_result_t result; /* Last result code. */ + /* fields used if GetAdaptersAddresses is available at runtime */ + IP_ADAPTER_ADDRESSES * ipaa; /* GAA() result buffer */ + ULONG ipaasize; /* Bytes allocated */ + IP_ADAPTER_ADDRESSES * ipaaCur; /* enumeration position */ + IP_ADAPTER_UNICAST_ADDRESS *ipuaCur; /* enumeration subposition */ + /* fields used for the older address enumeration ioctls */ + int socket; + INTERFACE_INFO IFData; /* Current Interface Info */ + int numIF; /* Current Interface count */ + int v4IF; /* Number of IPv4 Interfaces */ + INTERFACE_INFO *buf4; /* Buffer for WSAIoctl data. */ + unsigned int buf4size; /* Bytes allocated. */ + INTERFACE_INFO *pos4; /* Current offset in IF List */ + SOCKET_ADDRESS_LIST *buf6; + unsigned int buf6size; /* Bytes allocated. */ + unsigned int pos6; /* buf6 index, counts down */ + struct in6_addr loop__1; /* ::1 node-scope localhost */ + struct in6_addr loopfe80__1; /* fe80::1 link-scope localhost */ +}; + +typedef ULONG (WINAPI *PGETADAPTERSADDRESSES)( + ULONG Family, + ULONG Flags, + PVOID Reserved, + PIP_ADAPTER_ADDRESSES AdapterAddresses, + PULONG SizePointer +); + +static isc_boolean_t use_GAA; +static isc_boolean_t use_GAA_determined; +static HMODULE hmod_iphlpapi; +static PGETADAPTERSADDRESSES pGAA; + + +/* + * Size of buffer for SIO_GET_INTERFACE_LIST, in number of interfaces. + * We assume no sane system will have more than than 1K of IP addresses on + * all of its adapters. + */ +#define IFCONF_SIZE_INITIAL 16 +#define IFCONF_SIZE_INCREMENT 64 +#define IFCONF_SIZE_MAX 1040 + + +/* Common utility functions */ + +/* + * Windows always provides 255.255.255.255 as the the broadcast + * address. ntpd needs to know the broadcast address which will target + * only that network interface, not all. Reconstruct it from the + * address and mask. + */ +static void +get_broadcastaddr(isc_netaddr_t *bcastaddr, isc_netaddr_t *addr, isc_netaddr_t *netmask) { + + isc_uint32_t * b; + isc_uint32_t a, n; + + b = (isc_uint32_t *)&bcastaddr->type.in; + a = *(isc_uint32_t *)&addr->type.in; + n = *(isc_uint32_t *)&netmask->type.in; + + *b = a | ~n; +} + +isc_result_t +isc_interfaceiter_create(isc_mem_t *mctx, isc_interfaceiter_t **iterp) { + char strbuf[ISC_STRERRORSIZE]; + isc_interfaceiter_t *iter; + isc_result_t result; + unsigned int major; + unsigned int minor; + unsigned int spmajor; + ULONG err; + int tries; + int error; + unsigned long bytesReturned = 0; + + REQUIRE(mctx != NULL); + REQUIRE(iterp != NULL); + REQUIRE(*iterp == NULL); + + iter = isc_mem_get(mctx, sizeof(*iter)); + if (iter == NULL) + return (ISC_R_NOMEMORY); + + InitSockets(); + + iter->mctx = mctx; + iter->ipaa = NULL; + iter->buf4 = NULL; + iter->buf6 = NULL; + iter->pos4 = NULL; + iter->ipaaCur = NULL; + iter->ipuaCur = NULL; + iter->ipaasize = 0; + iter->pos6 = 0; + iter->buf6size = 0; + iter->buf4size = 0; + iter->result = ISC_R_FAILURE; + iter->numIF = 0; + iter->v4IF = 0; + + /* + * Use GetAdaptersAddresses in preference to ioctls when running + * on Windows XP SP1 or later. Earlier GetAdaptersAddresses do + * not appear to provide enough information to associate unicast + * addresses with their prefixes. + */ + if (!use_GAA_determined) { + major = isc_win32os_majorversion(); + minor = isc_win32os_minorversion(); + spmajor = isc_win32os_servicepackmajor(); + if (major > 5 || (5 == major && + (minor > 1 || (1 == minor && spmajor >= 1)))) { + if (NULL == hmod_iphlpapi) + hmod_iphlpapi = LoadLibrary("iphlpapi"); + if (NULL != hmod_iphlpapi) + pGAA = (PGETADAPTERSADDRESSES) + GetProcAddress( + hmod_iphlpapi, + "GetAdaptersAddresses"); + if (NULL != pGAA) + use_GAA = ISC_TRUE; + } + use_GAA_determined = ISC_TRUE; + } + + if (!use_GAA) + goto use_ioctls; + + iter->ipaasize = 16 * 1024; + + for (tries = 0; tries < 5; tries++) { + iter->ipaa = isc_mem_reallocate(mctx, iter->ipaa, + iter->ipaasize); + if (NULL == iter->ipaa) { + result = ISC_R_NOMEMORY; + goto put_iter; + } + err = (*pGAA)( + AF_UNSPEC, + GAA_FLAG_INCLUDE_PREFIX | GAA_FLAG_SKIP_ANYCAST, + NULL, + iter->ipaa, + &iter->ipaasize); + if (NO_ERROR == err || ERROR_BUFFER_OVERFLOW != err) + break; + } + + if (NO_ERROR != err) { + isc__strerror(err, strbuf, sizeof(strbuf)); + UNEXPECTED_ERROR(__FILE__, __LINE__, + "GetAdaptersAddresses: %s", + strbuf); + result = ISC_R_UNEXPECTED; + goto gaa_failure; + } + + iter->ipaaCur = iter->ipaa; + goto success; + + use_ioctls: + /* + * Create an unbound datagram socket to do the + * SIO_GET_INTERFACE_LIST WSAIoctl on. + */ + if ((iter->socket = socket(AF_INET, SOCK_DGRAM, 0)) < 0) { + error = WSAGetLastError(); + if (error == WSAEAFNOSUPPORT) + goto inet6_only; + isc__strerror(error, strbuf, sizeof(strbuf)); + UNEXPECTED_ERROR(__FILE__, __LINE__, + "making interface scan socket: %s", + strbuf); + result = ISC_R_UNEXPECTED; + goto put_iter; + } + + /* + * Get the interface configuration, allocating more memory if + * necessary. + */ + iter->buf4size = IFCONF_SIZE_INITIAL*sizeof(INTERFACE_INFO); + + for (;;) { + iter->buf4 = isc_mem_get(mctx, iter->buf4size); + if (iter->buf4 == NULL) { + result = ISC_R_NOMEMORY; + goto alloc_failure; + } + + if (WSAIoctl(iter->socket, SIO_GET_INTERFACE_LIST, + 0, 0, iter->buf4, iter->buf4size, + &bytesReturned, 0, 0) == SOCKET_ERROR) + { + error = WSAGetLastError(); + if (error != WSAEFAULT && error != WSAENOBUFS) { + errno = error; + isc__strerror(error, strbuf, sizeof(strbuf)); + UNEXPECTED_ERROR(__FILE__, __LINE__, + "get interface configuration: %s", + strbuf); + result = ISC_R_UNEXPECTED; + goto ioctl_failure; + } + /* + * EINVAL. Retry with a bigger buffer. + */ + } else { + /* + * The WSAIoctl succeeded. + * If the number of the returned bytes is the same + * as the buffer size, we will grow it just in + * case and retry. + */ + if (bytesReturned > 0 && + (bytesReturned < iter->buf4size)) + break; + } + if (iter->buf4size >= IFCONF_SIZE_MAX*sizeof(INTERFACE_INFO)) { + UNEXPECTED_ERROR(__FILE__, __LINE__, + "get interface configuration: " + "maximum buffer size exceeded"); + result = ISC_R_UNEXPECTED; + goto ioctl_failure; + } + isc_mem_put(mctx, iter->buf4, iter->buf4size); + + iter->buf4size += IFCONF_SIZE_INCREMENT * + sizeof(INTERFACE_INFO); + } + + /* + * A newly created iterator has an undefined position + * until isc_interfaceiter_first() is called. + */ + iter->v4IF = bytesReturned/sizeof(INTERFACE_INFO); + + /* We don't need the socket any more, so close it */ + closesocket(iter->socket); + + inet6_only: + /* + * Create an unbound datagram socket to do the + * SIO_ADDRESS_LIST_QUERY WSAIoctl on. + */ + if ((iter->socket = socket(AF_INET6, SOCK_DGRAM, 0)) < 0) { + error = WSAGetLastError(); + if (error == WSAEAFNOSUPPORT) + goto success; + isc__strerror(error, strbuf, sizeof(strbuf)); + UNEXPECTED_ERROR(__FILE__, __LINE__, + "making interface scan socket: %s", + strbuf); + result = ISC_R_UNEXPECTED; + goto put_iter; + } + + /* + * Get the interface configuration, allocating more memory if + * necessary. + */ + iter->buf6size = sizeof(SOCKET_ADDRESS_LIST) + + IFCONF_SIZE_INITIAL*sizeof(SOCKET_ADDRESS); + + for (;;) { + iter->buf6 = isc_mem_get(mctx, iter->buf6size); + if (iter->buf6 == NULL) { + result = ISC_R_NOMEMORY; + goto ioctl_failure; + } + + if (WSAIoctl(iter->socket, SIO_ADDRESS_LIST_QUERY, + 0, 0, iter->buf6, iter->buf6size, + &bytesReturned, 0, 0) == SOCKET_ERROR) + { + error = WSAGetLastError(); + if (error != WSAEFAULT && error != WSAENOBUFS) { + errno = error; + isc__strerror(error, strbuf, sizeof(strbuf)); + UNEXPECTED_ERROR(__FILE__, __LINE__, + "sio address list query: %s", + strbuf); + result = ISC_R_UNEXPECTED; + goto ioctl6_failure; + } + /* + * EINVAL. Retry with a bigger buffer. + */ + } else + break; + + if (iter->buf6size >= IFCONF_SIZE_MAX*sizeof(SOCKET_ADDRESS)) { + UNEXPECTED_ERROR(__FILE__, __LINE__, + "get interface configuration: " + "maximum buffer size exceeded"); + result = ISC_R_UNEXPECTED; + goto ioctl6_failure; + } + isc_mem_put(mctx, iter->buf6, iter->buf6size); + + iter->buf6size += IFCONF_SIZE_INCREMENT * + sizeof(SOCKET_ADDRESS); + } + + /* + * initialize loop__1 to [::1] and loopfe80__1 to [fe80::1]. + * used by internal_current6(). + */ + memset(&iter->loop__1, 0, sizeof(iter->loop__1)); + memset(&iter->loopfe80__1, 0, sizeof(iter->loopfe80__1)); + iter->loop__1.s6_addr[15] = 1; + iter->loopfe80__1.s6_addr[15] = 1; + iter->loopfe80__1.s6_addr[0] = 0xfe; + iter->loopfe80__1.s6_addr[1] = 0x80; + + closesocket(iter->socket); + + success: + iter->magic = IFITER_MAGIC; + *iterp = iter; + return (ISC_R_SUCCESS); + + gaa_failure: + isc_mem_put(mctx, iter->ipaa, iter->ipaasize); + goto put_iter; + + ioctl6_failure: + isc_mem_put(mctx, iter->buf6, iter->buf6size); + + ioctl_failure: + if (iter->buf4 != NULL) + isc_mem_put(mctx, iter->buf4, iter->buf4size); + + alloc_failure: + if (iter->socket >= 0) + (void) closesocket(iter->socket); + + put_iter: + isc_mem_put(mctx, iter, sizeof(*iter)); + return (result); +} + +static unsigned char +GAA_find_prefix(isc_interfaceiter_t *iter) { + IP_ADAPTER_PREFIX * ipap; + IP_ADAPTER_PREFIX * ipap_match; + int match_len; + int max_len; + isc_netaddr_t target; + u_short af; + isc_netaddr_t pfx; + int pfx_len; + size_t nbytes; + unsigned char nbits; + unsigned char * pbits; + unsigned int octets; + + match_len = 0; + ipap_match = NULL; + isc_netaddr_fromsockaddr(&target, + (isc_sockaddr_t *)iter->ipuaCur->Address.lpSockaddr); + af = (u_short)target.family; + INSIST(AF_INET == af || AF_INET6 == af); + max_len = (AF_INET6 == af) ? 128 : 32; + iter->current.netmask.family = af; + for (ipap = iter->ipaaCur->FirstPrefix; + ipap != NULL; + ipap = ipap->Next) { + if (ipap->Address.lpSockaddr->sa_family != af) + continue; + isc_netaddr_fromsockaddr(&pfx, + (isc_sockaddr_t *)ipap->Address.lpSockaddr); + pfx_len = ipap->PrefixLength; + INSIST(0 <= pfx_len && pfx_len <= max_len); + if (pfx_len > match_len && pfx_len < max_len && + isc_netaddr_eqprefix(&target, &pfx, pfx_len)) { + ipap_match = ipap; + match_len = pfx_len; + } + } + if (NULL == ipap_match) { + /* presume all-ones mask */ + if (AF_INET6 == af) + octets = sizeof(iter->current.netmask.type.in6); + else + octets = sizeof(iter->current.netmask.type.in); + memset(&iter->current.netmask.type, 0xFF, octets); + return (8 * (unsigned char)octets); + } + nbytes = match_len / 8; + nbits = match_len % 8; + memset(&iter->current.netmask.type.in6, 0xFF, nbytes); + pbits = (void *)&iter->current.netmask.type.in6; + pbits += nbytes; + *pbits |= 0xFF << (8 - nbits); + return ((unsigned char)match_len); +} + +static isc_result_t +internal_current_GAA(isc_interfaceiter_t *iter) { + IP_ADAPTER_ADDRESSES *adap; + IP_ADAPTER_UNICAST_ADDRESS *addr; + unsigned char prefix_len; + + REQUIRE(iter->ipaaCur != NULL); + REQUIRE(iter->ipuaCur != NULL); + adap = iter->ipaaCur; + addr = iter->ipuaCur; + if (IpDadStatePreferred != addr->DadState) + return (ISC_R_IGNORE); + memset(&iter->current, 0, sizeof(iter->current)); + iter->current.af = addr->Address.lpSockaddr->sa_family; + isc_netaddr_fromsockaddr(&iter->current.address, + (isc_sockaddr_t *)addr->Address.lpSockaddr); + if (AF_INET6 == iter->current.af) + iter->current.ifindex = adap->Ipv6IfIndex; + iter->current.name[0] = '\0'; + WideCharToMultiByte( + CP_ACP, + 0, + adap->FriendlyName, + -1, + iter->current.name, + sizeof(iter->current.name), + NULL, + NULL); + iter->current.name[sizeof(iter->current.name) - 1] = '\0'; + if (IfOperStatusUp == adap->OperStatus) + iter->current.flags |= INTERFACE_F_UP; + if (IF_TYPE_PPP == adap->IfType) + iter->current.flags |= INTERFACE_F_POINTTOPOINT; + else if (IF_TYPE_SOFTWARE_LOOPBACK == adap->IfType) + iter->current.flags |= INTERFACE_F_LOOPBACK; + if ((IP_ADAPTER_NO_MULTICAST & adap->Flags) == 0) + iter->current.flags |= INTERFACE_F_MULTICAST; + if (IpSuffixOriginRandom == addr->SuffixOrigin) + iter->current.flags |= INTERFACE_F_PRIVACY; + + prefix_len = GAA_find_prefix(iter); + /* I'm failing to see a broadcast flag via GAA */ + if (AF_INET == iter->current.af && prefix_len < 32 && + (INTERFACE_F_LOOPBACK & iter->current.flags) == 0) { + iter->current.flags |= INTERFACE_F_BROADCAST; + get_broadcastaddr(&iter->current.broadcast, + &iter->current.address, + &iter->current.netmask); + } + return (ISC_R_SUCCESS); +} + +/* + * Get information about the current interface to iter->current. + * If successful, return ISC_R_SUCCESS. + * If the interface has an unsupported address family, or if + * some operation on it fails, return ISC_R_IGNORE to make + * the higher-level iterator code ignore it. + */ + +static isc_result_t +internal_current(isc_interfaceiter_t *iter) { + BOOL ifNamed = FALSE; + unsigned long flags; + + REQUIRE(VALID_IFITER(iter)); + REQUIRE(iter->numIF >= 0); + + memset(&iter->current, 0, sizeof(iter->current)); + iter->current.af = AF_INET; + + isc_netaddr_fromsockaddr(&iter->current.address, + (isc_sockaddr_t *)&(iter->IFData.iiAddress)); + + /* + * Get interface flags. + */ + + iter->current.flags = 0; + flags = iter->IFData.iiFlags; + + if ((flags & IFF_UP) != 0) + iter->current.flags |= INTERFACE_F_UP; + + if ((flags & IFF_BROADCAST) != 0) + iter->current.flags |= INTERFACE_F_BROADCAST; + + if ((flags & IFF_MULTICAST) != 0) + iter->current.flags |= INTERFACE_F_MULTICAST; + + if ((flags & IFF_POINTTOPOINT) != 0) { + iter->current.flags |= INTERFACE_F_POINTTOPOINT; + snprintf(iter->current.name, sizeof(iter->current.name), + "PPP %d", iter->numIF); + ifNamed = TRUE; + } + + if ((flags & IFF_LOOPBACK) != 0) { + iter->current.flags |= INTERFACE_F_LOOPBACK; + snprintf(iter->current.name, sizeof(iter->current.name), + "v4loop %d", iter->numIF); + ifNamed = TRUE; + } + + /* + * If the interface is point-to-point, get the destination address. + */ + if ((iter->current.flags & INTERFACE_F_POINTTOPOINT) != 0) + isc_netaddr_fromsockaddr(&iter->current.dstaddress, + (isc_sockaddr_t *)&(iter->IFData.iiBroadcastAddress)); + + /* + * Get the network mask. + */ + isc_netaddr_fromsockaddr(&iter->current.netmask, + (isc_sockaddr_t *)&(iter->IFData.iiNetmask)); + + /* + * If the interface is broadcast, get the broadcast address, + * based on the unicast address and network mask. + */ + if ((iter->current.flags & INTERFACE_F_BROADCAST) != 0) + get_broadcastaddr(&iter->current.broadcast, + &iter->current.address, + &iter->current.netmask); + + if (ifNamed == FALSE) + snprintf(iter->current.name, sizeof(iter->current.name), + "IPv4 %d", iter->numIF); + + return (ISC_R_SUCCESS); +} + +static isc_result_t +internal_current6(isc_interfaceiter_t *iter) { + BOOL ifNamed = FALSE; + struct sockaddr_in6 *psa6; + BOOL localhostSeen; + int i; + + REQUIRE(VALID_IFITER(iter)); + REQUIRE(iter->pos6 >= 0); + REQUIRE(iter->buf6 != 0); + + memset(&iter->current, 0, sizeof(iter->current)); + iter->current.af = AF_INET6; + + /* + * synthesize localhost ::1 before returning the rest, if ::1 + * is not on the list. + */ + if (iter->pos6 >= (unsigned)iter->buf6->iAddressCount) { + localhostSeen = FALSE; + for (i = 0; i < iter->buf6->iAddressCount; i++) { + psa6 = (struct sockaddr_in6 *) + iter->buf6->Address[i].lpSockaddr; + if (!memcmp(&iter->loop__1, &psa6->sin6_addr, + sizeof(iter->loop__1))) { + localhostSeen = TRUE; + break; + } + } + if (localhostSeen) + iter->pos6 = iter->buf6->iAddressCount - 1; + } + + if (iter->pos6 < (unsigned)iter->buf6->iAddressCount) { + isc_netaddr_fromsockaddr(&iter->current.address, + (isc_sockaddr_t *)iter->buf6->Address[iter->pos6].lpSockaddr); + } else { + iter->current.address.family = AF_INET6; + memcpy(&iter->current.address.type.in6, &iter->loop__1, + sizeof(iter->current.address.type.in6)); + } + + /* + * Get interface flags. + */ + + iter->current.flags = INTERFACE_F_UP | INTERFACE_F_MULTICAST; + + if (!memcmp(&iter->current.address.type.in6, &iter->loop__1, + sizeof(iter->current.address.type.in6)) || + !memcmp(&iter->current.address.type.in6, &iter->loopfe80__1, + sizeof(iter->current.address.type.in6))) { + + iter->current.flags |= INTERFACE_F_LOOPBACK; + snprintf(iter->current.name, sizeof(iter->current.name), + "v6loop %d", + iter->buf6->iAddressCount - iter->pos6); + ifNamed = TRUE; + } + + if (ifNamed == FALSE) + snprintf(iter->current.name, sizeof(iter->current.name), + "IPv6 %d", + iter->buf6->iAddressCount - iter->pos6); + + memset(iter->current.netmask.type.in6.s6_addr, 0xff, + sizeof(iter->current.netmask.type.in6.s6_addr)); + iter->current.netmask.family = AF_INET6; + return (ISC_R_SUCCESS); +} + +static isc_result_t +internal_next_GAA(isc_interfaceiter_t *iter) { + REQUIRE(use_GAA); + if (NULL == iter->ipaaCur) + return (ISC_R_NOMORE); + if (NULL == iter->ipuaCur) + iter->ipuaCur = iter->ipaaCur->FirstUnicastAddress; + else + iter->ipuaCur = iter->ipuaCur->Next; + while (NULL == iter->ipuaCur) { + iter->ipaaCur = iter->ipaaCur->Next; + if (NULL == iter->ipaaCur) + return (ISC_R_NOMORE); + iter->ipuaCur = iter->ipaaCur->FirstUnicastAddress; + } + return (ISC_R_SUCCESS); +} + +/* + * Step the iterator to the next interface. Unlike + * isc_interfaceiter_next(), this may leave the iterator + * positioned on an interface that will ultimately + * be ignored. Return ISC_R_NOMORE if there are no more + * interfaces, otherwise ISC_R_SUCCESS. + */ +static isc_result_t +internal_next(isc_interfaceiter_t *iter) { + if (iter->numIF >= iter->v4IF) + return (ISC_R_NOMORE); + + /* + * The first one needs to be set up to point to the last + * Element of the array. Go to the end and back up + * Microsoft's implementation is peculiar for returning + * the list in reverse order + */ + + if (iter->numIF == 0) + iter->pos4 = (INTERFACE_INFO *)(iter->buf4 + (iter->v4IF)); + + iter->pos4--; + if (&(iter->pos4) < &(iter->buf4)) + return (ISC_R_NOMORE); + + memset(&(iter->IFData), 0, sizeof(INTERFACE_INFO)); + memcpy(&(iter->IFData), iter->pos4, sizeof(INTERFACE_INFO)); + iter->numIF++; + + return (ISC_R_SUCCESS); +} + +static isc_result_t +internal_next6(isc_interfaceiter_t *iter) { + if (iter->pos6 == 0) + return (ISC_R_NOMORE); + iter->pos6--; + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_interfaceiter_current(isc_interfaceiter_t *iter, + isc_interface_t *ifdata) { + REQUIRE(iter->result == ISC_R_SUCCESS); + memcpy(ifdata, &iter->current, sizeof(*ifdata)); + return (ISC_R_SUCCESS); +} + +isc_result_t +isc_interfaceiter_first(isc_interfaceiter_t *iter) { + REQUIRE(VALID_IFITER(iter)); + REQUIRE(use_GAA_determined); + /* + * SIO_ADDRESS_LIST_QUERY (used to query IPv6 addresses) + * intentionally omits localhost addresses [::1] and [::fe80] in + * some cases. ntpd depends on enumerating [::1] to listen on + * it, and ntpq and ntpdc default to "localhost" as the target, + * so they will attempt to talk to [::1]:123 and fail. This + * means we need to synthesize ::1, which we will do first, + * hence iAddressCount + 1. internal_next6() will decrement + * it before the first use as an index, and internal_current6() + * will treat pos6 == iAddressCount as a sign to synthesize + * [::1] if needed. + */ + if (!use_GAA && iter->buf6 != NULL) + iter->pos6 = iter->buf6->iAddressCount + 1; + iter->result = ISC_R_SUCCESS; + return (isc_interfaceiter_next(iter)); +} + +isc_result_t +isc_interfaceiter_next(isc_interfaceiter_t *iter) { + isc_result_t result; + + REQUIRE(VALID_IFITER(iter)); + REQUIRE(iter->result == ISC_R_SUCCESS); + REQUIRE(use_GAA_determined); + + if (use_GAA) { + do { + result = internal_next_GAA(iter); + if (ISC_R_NOMORE == result) + goto set_result; + result = internal_current_GAA(iter); + } while (ISC_R_IGNORE == result); + goto set_result; + } + + for (;;) { + result = internal_next(iter); + if (result == ISC_R_NOMORE) { + result = internal_next6(iter); + if (result != ISC_R_SUCCESS) + break; + result = internal_current6(iter); + if (result != ISC_R_IGNORE) + break; + } else if (result != ISC_R_SUCCESS) + break; + result = internal_current(iter); + if (result != ISC_R_IGNORE) + break; + } + set_result: + iter->result = result; + return (result); +} + +void +isc_interfaceiter_destroy(isc_interfaceiter_t **iterp) { + isc_interfaceiter_t *iter; + + REQUIRE(iterp != NULL); + iter = *iterp; + REQUIRE(VALID_IFITER(iter)); + REQUIRE(use_GAA_determined); + + if (use_GAA) { + REQUIRE(NULL == iter->buf4); + REQUIRE(NULL == iter->buf4); + if (iter->ipaa != NULL) + isc_mem_put(iter->mctx, iter->ipaa, iter->ipaasize); + } else { + REQUIRE(NULL == iter->ipaa); + if (iter->buf4 != NULL) + isc_mem_put(iter->mctx, iter->buf4, iter->buf4size); + if (iter->buf6 != NULL) + isc_mem_put(iter->mctx, iter->buf6, iter->buf6size); + } + + iter->magic = 0; + isc_mem_put(iter->mctx, iter, sizeof(*iter)); + *iterp = NULL; +} |