/* $NetBSD: interfaceiter.c,v 1.6 2020/05/25 20:47:23 christos Exp $ */ /* * 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 #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include 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 */ SOCKET 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; }