/* -*- mode: C; c-file-style: "gnu"; indent-tabs-mode: nil; -*- */ /* GIO - GLib Input, Output and Streaming Library * * Copyright (C) 2008 Red Hat, Inc. * * This library is free software; you can redistribute it and/or * modify it under the terms of the GNU Lesser General Public * License as published by the Free Software Foundation; either * version 2 of the License, or (at your option) any later version. * * This library is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU * Lesser General Public License for more details. * * You should have received a copy of the GNU Lesser General * Public License along with this library; if not, write to the * Free Software Foundation, Inc., 59 Temple Place, Suite 330, * Boston, MA 02111-1307, USA. */ #include "config.h" #include #include "glibintl.h" #include #include #include "gthreadedresolver.h" #include "gnetworkingprivate.h" #include "gcancellable.h" #include "ginetaddress.h" #include "ginetsocketaddress.h" #include "gtask.h" #include "gsocketaddress.h" #include "gsrvtarget.h" G_DEFINE_TYPE (GThreadedResolver, g_threaded_resolver, G_TYPE_RESOLVER) static void g_threaded_resolver_init (GThreadedResolver *gtr) { } static GResolverError g_resolver_error_from_addrinfo_error (gint err) { switch (err) { case EAI_FAIL: #if defined(EAI_NODATA) && (EAI_NODATA != EAI_NONAME) case EAI_NODATA: #endif case EAI_NONAME: return G_RESOLVER_ERROR_NOT_FOUND; case EAI_AGAIN: return G_RESOLVER_ERROR_TEMPORARY_FAILURE; default: return G_RESOLVER_ERROR_INTERNAL; } } static struct addrinfo addrinfo_hints; static void do_lookup_by_name (GTask *task, gpointer source_object, gpointer task_data, GCancellable *cancellable) { const char *hostname = task_data; struct addrinfo *res = NULL; GList *addresses; gint retval; retval = getaddrinfo (hostname, NULL, &addrinfo_hints, &res); if (retval == 0) { struct addrinfo *ai; GSocketAddress *sockaddr; GInetAddress *addr; addresses = NULL; for (ai = res; ai; ai = ai->ai_next) { sockaddr = g_socket_address_new_from_native (ai->ai_addr, ai->ai_addrlen); if (!sockaddr || !G_IS_INET_SOCKET_ADDRESS (sockaddr)) continue; addr = g_object_ref (g_inet_socket_address_get_address ((GInetSocketAddress *)sockaddr)); addresses = g_list_prepend (addresses, addr); g_object_unref (sockaddr); } addresses = g_list_reverse (addresses); g_task_return_pointer (task, addresses, (GDestroyNotify)g_resolver_free_addresses); } else { g_task_return_new_error (task, G_RESOLVER_ERROR, g_resolver_error_from_addrinfo_error (retval), _("Error resolving '%s': %s"), hostname, gai_strerror (retval)); } if (res) freeaddrinfo (res); } static GList * lookup_by_name (GResolver *resolver, const gchar *hostname, GCancellable *cancellable, GError **error) { GTask *task; GList *addresses; task = g_task_new (resolver, cancellable, NULL, NULL); g_task_set_task_data (task, g_strdup (hostname), g_free); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread_sync (task, do_lookup_by_name); addresses = g_task_propagate_pointer (task, error); g_object_unref (task); return addresses; } static void lookup_by_name_async (GResolver *resolver, const gchar *hostname, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GTask *task; task = g_task_new (resolver, cancellable, callback, user_data); g_task_set_task_data (task, g_strdup (hostname), g_free); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread (task, do_lookup_by_name); g_object_unref (task); } static GList * lookup_by_name_finish (GResolver *resolver, GAsyncResult *result, GError **error) { g_return_val_if_fail (g_task_is_valid (result, resolver), NULL); return g_task_propagate_pointer (G_TASK (result), error); } static void do_lookup_by_address (GTask *task, gpointer source_object, gpointer task_data, GCancellable *cancellable) { GInetAddress *address = task_data; struct sockaddr_storage sockaddr; gsize sockaddr_size; GSocketAddress *gsockaddr; gchar name[NI_MAXHOST]; gint retval; gsockaddr = g_inet_socket_address_new (address, 0); g_socket_address_to_native (gsockaddr, (struct sockaddr *)&sockaddr, sizeof (sockaddr), NULL); sockaddr_size = g_socket_address_get_native_size (gsockaddr); g_object_unref (gsockaddr); retval = getnameinfo ((struct sockaddr *)&sockaddr, sockaddr_size, name, sizeof (name), NULL, 0, NI_NAMEREQD); if (retval == 0) g_task_return_pointer (task, g_strdup (name), g_free); else { gchar *phys; phys = g_inet_address_to_string (address); g_task_return_new_error (task, G_RESOLVER_ERROR, g_resolver_error_from_addrinfo_error (retval), _("Error reverse-resolving '%s': %s"), phys ? phys : "(unknown)", gai_strerror (retval)); g_free (phys); } } static gchar * lookup_by_address (GResolver *resolver, GInetAddress *address, GCancellable *cancellable, GError **error) { GTask *task; gchar *name; task = g_task_new (resolver, cancellable, NULL, NULL); g_task_set_task_data (task, g_object_ref (address), g_object_unref); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread_sync (task, do_lookup_by_address); name = g_task_propagate_pointer (task, error); g_object_unref (task); return name; } static void lookup_by_address_async (GResolver *resolver, GInetAddress *address, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GTask *task; task = g_task_new (resolver, cancellable, callback, user_data); g_task_set_task_data (task, g_object_ref (address), g_object_unref); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread (task, do_lookup_by_address); g_object_unref (task); } static gchar * lookup_by_address_finish (GResolver *resolver, GAsyncResult *result, GError **error) { g_return_val_if_fail (g_task_is_valid (result, resolver), NULL); return g_task_propagate_pointer (G_TASK (result), error); } #if defined(G_OS_UNIX) #ifdef __BIONIC__ /* Copy from bionic/libc/private/arpa_nameser_compat.h * and bionic/libc/private/arpa_nameser.h */ typedef struct { unsigned id :16; /* query identification number */ #if BYTE_ORDER == BIG_ENDIAN /* fields in third byte */ unsigned qr: 1; /* response flag */ unsigned opcode: 4; /* purpose of message */ unsigned aa: 1; /* authoritive answer */ unsigned tc: 1; /* truncated message */ unsigned rd: 1; /* recursion desired */ /* fields in fourth byte */ unsigned ra: 1; /* recursion available */ unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ unsigned ad: 1; /* authentic data from named */ unsigned cd: 1; /* checking disabled by resolver */ unsigned rcode :4; /* response code */ #endif #if BYTE_ORDER == LITTLE_ENDIAN || BYTE_ORDER == PDP_ENDIAN /* fields in third byte */ unsigned rd :1; /* recursion desired */ unsigned tc :1; /* truncated message */ unsigned aa :1; /* authoritive answer */ unsigned opcode :4; /* purpose of message */ unsigned qr :1; /* response flag */ /* fields in fourth byte */ unsigned rcode :4; /* response code */ unsigned cd: 1; /* checking disabled by resolver */ unsigned ad: 1; /* authentic data from named */ unsigned unused :1; /* unused bits (MBZ as of 4.9.3a3) */ unsigned ra :1; /* recursion available */ #endif /* remaining bytes */ unsigned qdcount :16; /* number of question entries */ unsigned ancount :16; /* number of answer entries */ unsigned nscount :16; /* number of authority entries */ unsigned arcount :16; /* number of resource entries */ } HEADER; #define NS_INT32SZ 4 /* #/bytes of data in a uint32_t */ #define NS_INT16SZ 2 /* #/bytes of data in a uint16_t */ #define NS_GET16(s, cp) do { \ const u_char *t_cp = (const u_char *)(cp); \ (s) = ((uint16_t)t_cp[0] << 8) \ | ((uint16_t)t_cp[1]) \ ; \ (cp) += NS_INT16SZ; \ } while (/*CONSTCOND*/0) #define NS_GET32(l, cp) do { \ const u_char *t_cp = (const u_char *)(cp); \ (l) = ((uint32_t)t_cp[0] << 24) \ | ((uint32_t)t_cp[1] << 16) \ | ((uint32_t)t_cp[2] << 8) \ | ((uint32_t)t_cp[3]) \ ; \ (cp) += NS_INT32SZ; \ } while (/*CONSTCOND*/0) #define GETSHORT NS_GET16 #define GETLONG NS_GET32 #define C_IN 1 /* From bionic/libc/private/resolv_private.h */ int dn_expand(const u_char *, const u_char *, const u_char *, char *, int); #define dn_skipname __dn_skipname int dn_skipname(const u_char *, const u_char *); /* From bionic/libc/private/arpa_nameser_compat.h */ #define T_MX ns_t_mx #define T_TXT ns_t_txt #define T_SOA ns_t_soa #define T_NS ns_t_ns /* From bionic/libc/private/arpa_nameser.h */ typedef enum __ns_type { ns_t_invalid = 0, /* Cookie. */ ns_t_a = 1, /* Host address. */ ns_t_ns = 2, /* Authoritative server. */ ns_t_md = 3, /* Mail destination. */ ns_t_mf = 4, /* Mail forwarder. */ ns_t_cname = 5, /* Canonical name. */ ns_t_soa = 6, /* Start of authority zone. */ ns_t_mb = 7, /* Mailbox domain name. */ ns_t_mg = 8, /* Mail group member. */ ns_t_mr = 9, /* Mail rename name. */ ns_t_null = 10, /* Null resource record. */ ns_t_wks = 11, /* Well known service. */ ns_t_ptr = 12, /* Domain name pointer. */ ns_t_hinfo = 13, /* Host information. */ ns_t_minfo = 14, /* Mailbox information. */ ns_t_mx = 15, /* Mail routing information. */ ns_t_txt = 16, /* Text strings. */ ns_t_rp = 17, /* Responsible person. */ ns_t_afsdb = 18, /* AFS cell database. */ ns_t_x25 = 19, /* X_25 calling address. */ ns_t_isdn = 20, /* ISDN calling address. */ ns_t_rt = 21, /* Router. */ ns_t_nsap = 22, /* NSAP address. */ ns_t_nsap_ptr = 23, /* Reverse NSAP lookup (deprecated). */ ns_t_sig = 24, /* Security signature. */ ns_t_key = 25, /* Security key. */ ns_t_px = 26, /* X.400 mail mapping. */ ns_t_gpos = 27, /* Geographical position (withdrawn). */ ns_t_aaaa = 28, /* Ip6 Address. */ ns_t_loc = 29, /* Location Information. */ ns_t_nxt = 30, /* Next domain (security). */ ns_t_eid = 31, /* Endpoint identifier. */ ns_t_nimloc = 32, /* Nimrod Locator. */ ns_t_srv = 33, /* Server Selection. */ ns_t_atma = 34, /* ATM Address */ ns_t_naptr = 35, /* Naming Authority PoinTeR */ ns_t_kx = 36, /* Key Exchange */ ns_t_cert = 37, /* Certification record */ ns_t_a6 = 38, /* IPv6 address (deprecates AAAA) */ ns_t_dname = 39, /* Non-terminal DNAME (for IPv6) */ ns_t_sink = 40, /* Kitchen sink (experimentatl) */ ns_t_opt = 41, /* EDNS0 option (meta-RR) */ ns_t_apl = 42, /* Address prefix list (RFC 3123) */ ns_t_tkey = 249, /* Transaction key */ ns_t_tsig = 250, /* Transaction signature. */ ns_t_ixfr = 251, /* Incremental zone transfer. */ ns_t_axfr = 252, /* Transfer zone of authority. */ ns_t_mailb = 253, /* Transfer mailbox records. */ ns_t_maila = 254, /* Transfer mail agent records. */ ns_t_any = 255, /* Wildcard match. */ ns_t_zxfr = 256, /* BIND-specific, nonstandard. */ ns_t_max = 65536 } ns_type; #endif /* __BIONIC__ */ static GVariant * parse_res_srv (guchar *answer, guchar *end, guchar **p) { gchar namebuf[1024]; guint16 priority, weight, port; GETSHORT (priority, *p); GETSHORT (weight, *p); GETSHORT (port, *p); *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf)); return g_variant_new ("(qqqs)", priority, weight, port, namebuf); } static GVariant * parse_res_soa (guchar *answer, guchar *end, guchar **p) { gchar mnamebuf[1024]; gchar rnamebuf[1024]; guint32 serial, refresh, retry, expire, ttl; *p += dn_expand (answer, end, *p, mnamebuf, sizeof (mnamebuf)); *p += dn_expand (answer, end, *p, rnamebuf, sizeof (rnamebuf)); GETLONG (serial, *p); GETLONG (refresh, *p); GETLONG (retry, *p); GETLONG (expire, *p); GETLONG (ttl, *p); return g_variant_new ("(ssuuuuu)", mnamebuf, rnamebuf, serial, refresh, retry, expire, ttl); } static GVariant * parse_res_ns (guchar *answer, guchar *end, guchar **p) { gchar namebuf[1024]; *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf)); return g_variant_new ("(s)", namebuf); } static GVariant * parse_res_mx (guchar *answer, guchar *end, guchar **p) { gchar namebuf[1024]; guint16 preference; GETSHORT (preference, *p); *p += dn_expand (answer, end, *p, namebuf, sizeof (namebuf)); return g_variant_new ("(qs)", preference, namebuf); } static GVariant * parse_res_txt (guchar *answer, guchar *end, guchar **p) { GVariant *record; GPtrArray *array; guchar *at = *p; gsize len; array = g_ptr_array_new_with_free_func (g_free); while (at < end) { len = *(at++); if (len > at - end) break; g_ptr_array_add (array, g_strndup ((gchar *)at, len)); at += len; } *p = at; record = g_variant_new ("(@as)", g_variant_new_strv ((const gchar **)array->pdata, array->len)); g_ptr_array_free (array, TRUE); return record; } static gint g_resolver_record_type_to_rrtype (GResolverRecordType type) { switch (type) { case G_RESOLVER_RECORD_SRV: return T_SRV; case G_RESOLVER_RECORD_TXT: return T_TXT; case G_RESOLVER_RECORD_SOA: return T_SOA; case G_RESOLVER_RECORD_NS: return T_NS; case G_RESOLVER_RECORD_MX: return T_MX; } g_return_val_if_reached (-1); } static GList * g_resolver_records_from_res_query (const gchar *rrname, gint rrtype, guchar *answer, gint len, gint herr, GError **error) { gint count; gchar namebuf[1024]; guchar *end, *p; guint16 type, qclass, rdlength; guint32 ttl; HEADER *header; GList *records; GVariant *record; if (len <= 0) { GResolverError errnum; const gchar *format; if (len == 0 || herr == HOST_NOT_FOUND || herr == NO_DATA) { errnum = G_RESOLVER_ERROR_NOT_FOUND; format = _("No DNS record of the requested type for '%s'"); } else if (herr == TRY_AGAIN) { errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE; format = _("Temporarily unable to resolve '%s'"); } else { errnum = G_RESOLVER_ERROR_INTERNAL; format = _("Error resolving '%s'"); } g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname); return NULL; } records = NULL; header = (HEADER *)answer; p = answer + sizeof (HEADER); end = answer + len; /* Skip query */ count = ntohs (header->qdcount); while (count-- && p < end) { p += dn_expand (answer, end, p, namebuf, sizeof (namebuf)); p += 4; /* To silence gcc warnings */ namebuf[0] = namebuf[1]; } /* Read answers */ count = ntohs (header->ancount); while (count-- && p < end) { p += dn_expand (answer, end, p, namebuf, sizeof (namebuf)); GETSHORT (type, p); GETSHORT (qclass, p); GETLONG (ttl, p); ttl = ttl; /* To avoid -Wunused-but-set-variable */ GETSHORT (rdlength, p); if (type != rrtype || qclass != C_IN) { p += rdlength; continue; } switch (rrtype) { case T_SRV: record = parse_res_srv (answer, end, &p); break; case T_MX: record = parse_res_mx (answer, end, &p); break; case T_SOA: record = parse_res_soa (answer, end, &p); break; case T_NS: record = parse_res_ns (answer, end, &p); break; case T_TXT: record = parse_res_txt (answer, p + rdlength, &p); break; default: g_warn_if_reached (); record = NULL; break; } if (record != NULL) records = g_list_prepend (records, record); } if (records == NULL) { g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND, _("No DNS record of the requested type for '%s'"), rrname); return NULL; } else return records; } #elif defined(G_OS_WIN32) static GVariant * parse_dns_srv (DNS_RECORD *rec) { return g_variant_new ("(qqqs)", (guint16)rec->Data.SRV.wPriority, (guint16)rec->Data.SRV.wWeight, (guint16)rec->Data.SRV.wPort, rec->Data.SRV.pNameTarget); } static GVariant * parse_dns_soa (DNS_RECORD *rec) { return g_variant_new ("(ssuuuuu)", rec->Data.SOA.pNamePrimaryServer, rec->Data.SOA.pNameAdministrator, (guint32)rec->Data.SOA.dwSerialNo, (guint32)rec->Data.SOA.dwRefresh, (guint32)rec->Data.SOA.dwRetry, (guint32)rec->Data.SOA.dwExpire, (guint32)rec->Data.SOA.dwDefaultTtl); } static GVariant * parse_dns_ns (DNS_RECORD *rec) { return g_variant_new ("(s)", rec->Data.NS.pNameHost); } static GVariant * parse_dns_mx (DNS_RECORD *rec) { return g_variant_new ("(qs)", (guint16)rec->Data.MX.wPreference, rec->Data.MX.pNameExchange); } static GVariant * parse_dns_txt (DNS_RECORD *rec) { GVariant *record; GPtrArray *array; DWORD i; array = g_ptr_array_new (); for (i = 0; i < rec->Data.TXT.dwStringCount; i++) g_ptr_array_add (array, rec->Data.TXT.pStringArray[i]); record = g_variant_new ("(@as)", g_variant_new_strv ((const gchar **)array->pdata, array->len)); g_ptr_array_free (array, TRUE); return record; } static WORD g_resolver_record_type_to_dnstype (GResolverRecordType type) { switch (type) { case G_RESOLVER_RECORD_SRV: return DNS_TYPE_SRV; case G_RESOLVER_RECORD_TXT: return DNS_TYPE_TEXT; case G_RESOLVER_RECORD_SOA: return DNS_TYPE_SOA; case G_RESOLVER_RECORD_NS: return DNS_TYPE_NS; case G_RESOLVER_RECORD_MX: return DNS_TYPE_MX; } g_return_val_if_reached (-1); } static GList * g_resolver_records_from_DnsQuery (const gchar *rrname, WORD dnstype, DNS_STATUS status, DNS_RECORD *results, GError **error) { DNS_RECORD *rec; gpointer record; GList *records; if (status != ERROR_SUCCESS) { GResolverError errnum; const gchar *format; if (status == DNS_ERROR_RCODE_NAME_ERROR) { errnum = G_RESOLVER_ERROR_NOT_FOUND; format = _("No DNS record of the requested type for '%s'"); } else if (status == DNS_ERROR_RCODE_SERVER_FAILURE) { errnum = G_RESOLVER_ERROR_TEMPORARY_FAILURE; format = _("Temporarily unable to resolve '%s'"); } else { errnum = G_RESOLVER_ERROR_INTERNAL; format = _("Error resolving '%s'"); } g_set_error (error, G_RESOLVER_ERROR, errnum, format, rrname); return NULL; } records = NULL; for (rec = results; rec; rec = rec->pNext) { if (rec->wType != dnstype) continue; switch (dnstype) { case DNS_TYPE_SRV: record = parse_dns_srv (rec); break; case DNS_TYPE_SOA: record = parse_dns_soa (rec); break; case DNS_TYPE_NS: record = parse_dns_ns (rec); break; case DNS_TYPE_MX: record = parse_dns_mx (rec); break; case DNS_TYPE_TEXT: record = parse_dns_txt (rec); break; default: g_warn_if_reached (); record = NULL; break; } if (record != NULL) records = g_list_prepend (records, g_variant_ref_sink (record)); } if (records == NULL) { g_set_error (error, G_RESOLVER_ERROR, G_RESOLVER_ERROR_NOT_FOUND, _("No DNS record of the requested type for '%s'"), rrname); return NULL; } else return records; } #endif typedef struct { char *rrname; GResolverRecordType record_type; } LookupRecordsData; static void free_lookup_records_data (LookupRecordsData *lrd) { g_free (lrd->rrname); g_slice_free (LookupRecordsData, lrd); } static void free_records (GList *records) { g_list_free_full (records, (GDestroyNotify) g_variant_unref); } #if defined(G_OS_UNIX) #ifdef __BIONIC__ #define C_IN 1 int res_query(const char *, int, int, u_char *, int); #endif #endif static void do_lookup_records (GTask *task, gpointer source_object, gpointer task_data, GCancellable *cancellable) { LookupRecordsData *lrd = task_data; GList *records; GError *error = NULL; #if defined(G_OS_UNIX) gint len = 512; gint herr; GByteArray *answer; gint rrtype; rrtype = g_resolver_record_type_to_rrtype (lrd->record_type); answer = g_byte_array_new (); for (;;) { g_byte_array_set_size (answer, len * 2); len = res_query (lrd->rrname, C_IN, rrtype, answer->data, answer->len); /* If answer fit in the buffer then we're done */ if (len < 0 || len < (gint)answer->len) break; /* * On overflow some res_query's return the length needed, others * return the full length entered. This code works in either case. */ } herr = h_errno; records = g_resolver_records_from_res_query (lrd->rrname, rrtype, answer->data, len, herr, &error); g_byte_array_free (answer, TRUE); #else DNS_STATUS status; DNS_RECORD *results = NULL; WORD dnstype; dnstype = g_resolver_record_type_to_dnstype (lrd->record_type); status = DnsQuery_A (lrd->rrname, dnstype, DNS_QUERY_STANDARD, NULL, &results, NULL); records = g_resolver_records_from_DnsQuery (lrd->rrname, dnstype, status, results, &error); if (results != NULL) DnsRecordListFree (results, DnsFreeRecordList); #endif if (records) g_task_return_pointer (task, records, (GDestroyNotify) free_records); else g_task_return_error (task, error); } static GList * lookup_records (GResolver *resolver, const gchar *rrname, GResolverRecordType record_type, GCancellable *cancellable, GError **error) { GTask *task; GList *records; LookupRecordsData *lrd; task = g_task_new (resolver, cancellable, NULL, NULL); lrd = g_slice_new (LookupRecordsData); lrd->rrname = g_strdup (rrname); lrd->record_type = record_type; g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread_sync (task, do_lookup_records); records = g_task_propagate_pointer (task, error); g_object_unref (task); return records; } static void lookup_records_async (GResolver *resolver, const char *rrname, GResolverRecordType record_type, GCancellable *cancellable, GAsyncReadyCallback callback, gpointer user_data) { GTask *task; LookupRecordsData *lrd; task = g_task_new (resolver, cancellable, callback, user_data); lrd = g_slice_new (LookupRecordsData); lrd->rrname = g_strdup (rrname); lrd->record_type = record_type; g_task_set_task_data (task, lrd, (GDestroyNotify) free_lookup_records_data); g_task_set_return_on_cancel (task, TRUE); g_task_run_in_thread (task, do_lookup_records); g_object_unref (task); } static GList * lookup_records_finish (GResolver *resolver, GAsyncResult *result, GError **error) { g_return_val_if_fail (g_task_is_valid (result, resolver), NULL); return g_task_propagate_pointer (G_TASK (result), error); } static void g_threaded_resolver_class_init (GThreadedResolverClass *threaded_class) { GResolverClass *resolver_class = G_RESOLVER_CLASS (threaded_class); resolver_class->lookup_by_name = lookup_by_name; resolver_class->lookup_by_name_async = lookup_by_name_async; resolver_class->lookup_by_name_finish = lookup_by_name_finish; resolver_class->lookup_by_address = lookup_by_address; resolver_class->lookup_by_address_async = lookup_by_address_async; resolver_class->lookup_by_address_finish = lookup_by_address_finish; resolver_class->lookup_records = lookup_records; resolver_class->lookup_records_async = lookup_records_async; resolver_class->lookup_records_finish = lookup_records_finish; /* Initialize _g_resolver_addrinfo_hints */ #ifdef AI_ADDRCONFIG addrinfo_hints.ai_flags |= AI_ADDRCONFIG; #endif /* These two don't actually matter, they just get copied into the * returned addrinfo structures (and then we ignore them). But if * we leave them unset, we'll get back duplicate answers. */ addrinfo_hints.ai_socktype = SOCK_STREAM; addrinfo_hints.ai_protocol = IPPROTO_TCP; }