3 /* Copyright 1998 by the Massachusetts Institute of Technology.
5 * Permission to use, copy, modify, and distribute this
6 * software and its documentation for any purpose and without
7 * fee is hereby granted, provided that the above copyright
8 * notice appear in all copies and that both that copyright
9 * notice and this permission notice appear in supporting
10 * documentation, and that the name of M.I.T. not be used in
11 * advertising or publicity pertaining to distribution of the
12 * software without specific, written prior permission.
13 * M.I.T. makes no representations about the suitability of
14 * this software for any purpose. It is provided "as is"
15 * without express or implied warranty.
19 #if defined(WIN32) && !defined(WATT32)
22 #include <sys/socket.h>
23 #include <netinet/in.h>
25 #include <arpa/nameser.h>
26 #ifdef HAVE_ARPA_NAMESER_COMPAT_H
27 #include <arpa/nameser_compat.h>
36 #include "ares_private.h"
37 #include "inet_net_pton.h"
44 /* Arguments passed to ares_gethostbyaddr() */
48 ares_host_callback callback;
51 const char *remaining_lookups;
54 static void next_lookup(struct addr_query *aquery);
55 static void addr_callback(void *arg, int status, unsigned char *abuf,
57 static void end_aquery(struct addr_query *aquery, int status,
58 struct hostent *host);
59 static int file_lookup(union ares_addr *addr, int family, struct hostent **host);
61 void ares_gethostbyaddr(ares_channel channel, const void *addr, int addrlen,
62 int family, ares_host_callback callback, void *arg)
64 struct addr_query *aquery;
66 if (family != AF_INET && family != AF_INET6)
68 callback(arg, ARES_ENOTIMP, NULL);
72 if ((family == AF_INET && addrlen != sizeof(struct in_addr)) ||
73 (family == AF_INET6 && addrlen != sizeof(struct in6_addr)))
75 callback(arg, ARES_ENOTIMP, NULL);
79 aquery = malloc(sizeof(struct addr_query));
82 callback(arg, ARES_ENOMEM, NULL);
85 aquery->channel = channel;
86 if (family == AF_INET)
87 memcpy(&aquery->addr.addr4, addr, sizeof(struct in_addr));
89 memcpy(&aquery->addr.addr6, addr, sizeof(struct in6_addr));
90 aquery->family = family;
91 aquery->callback = callback;
93 aquery->remaining_lookups = channel->lookups;
98 static void next_lookup(struct addr_query *aquery)
102 int a1, a2, a3, a4, status;
103 struct hostent *host;
106 for (p = aquery->remaining_lookups; *p; p++)
111 if (aquery->family == AF_INET)
113 addr = ntohl(aquery->addr.addr4.s_addr);
114 a1 = (int)((addr >> 24) & 0xff);
115 a2 = (int)((addr >> 16) & 0xff);
116 a3 = (int)((addr >> 8) & 0xff);
117 a4 = (int)(addr & 0xff);
118 sprintf(name, "%d.%d.%d.%d.in-addr.arpa", a4, a3, a2, a1);
119 aquery->remaining_lookups = p + 1;
120 ares_query(aquery->channel, name, C_IN, T_PTR, addr_callback,
125 unsigned char *bytes;
126 bytes = (unsigned char *)&aquery->addr.addr6.s6_addr;
127 sprintf(name, "%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.%x.ip6.arpa",
128 bytes[15]&0xf, bytes[15] >> 4, bytes[14]&0xf, bytes[14] >> 4,
129 bytes[13]&0xf, bytes[13] >> 4, bytes[12]&0xf, bytes[12] >> 4,
130 bytes[11]&0xf, bytes[11] >> 4, bytes[10]&0xf, bytes[10] >> 4,
131 bytes[9]&0xf, bytes[9] >> 4, bytes[8]&0xf, bytes[8] >> 4,
132 bytes[7]&0xf, bytes[7] >> 4, bytes[6]&0xf, bytes[6] >> 4,
133 bytes[5]&0xf, bytes[5] >> 4, bytes[4]&0xf, bytes[4] >> 4,
134 bytes[3]&0xf, bytes[3] >> 4, bytes[2]&0xf, bytes[2] >> 4,
135 bytes[1]&0xf, bytes[1] >> 4, bytes[0]&0xf, bytes[0] >> 4);
136 aquery->remaining_lookups = p + 1;
137 ares_query(aquery->channel, name, C_IN, T_PTR, addr_callback,
142 status = file_lookup(&aquery->addr, aquery->family, &host);
143 if (status != ARES_ENOTFOUND)
145 end_aquery(aquery, status, host);
151 end_aquery(aquery, ARES_ENOTFOUND, NULL);
154 static void addr_callback(void *arg, int status, unsigned char *abuf, int alen)
156 struct addr_query *aquery = (struct addr_query *) arg;
157 struct hostent *host;
159 if (status == ARES_SUCCESS)
161 if (aquery->family == AF_INET)
162 status = ares_parse_ptr_reply(abuf, alen, &aquery->addr.addr4,
163 sizeof(struct in_addr), AF_INET, &host);
165 status = ares_parse_ptr_reply(abuf, alen, &aquery->addr.addr6,
166 sizeof(struct in6_addr), AF_INET6, &host);
167 end_aquery(aquery, status, host);
169 else if (status == ARES_EDESTRUCTION)
170 end_aquery(aquery, status, NULL);
175 static void end_aquery(struct addr_query *aquery, int status,
176 struct hostent *host)
178 aquery->callback(aquery->arg, status, host);
180 ares_free_hostent(host);
184 static int file_lookup(union ares_addr *addr, int family, struct hostent **host)
191 char PATH_HOSTS[MAX_PATH];
196 if (RegOpenKeyEx(HKEY_LOCAL_MACHINE, WIN_NS_NT_KEY, 0, KEY_READ, &hkeyHosts)
199 DWORD dwLength = MAX_PATH;
200 RegQueryValueEx(hkeyHosts, DATABASEPATH, NULL, NULL, (LPBYTE)tmp,
202 ExpandEnvironmentStrings(tmp, PATH_HOSTS, MAX_PATH);
203 RegCloseKey(hkeyHosts);
207 GetWindowsDirectory(PATH_HOSTS, MAX_PATH);
209 strcat(PATH_HOSTS, WIN_PATH_HOSTS);
211 #elif defined(WATT32)
212 extern const char *_w32_GetHostsFile (void);
213 const char *PATH_HOSTS = _w32_GetHostsFile();
216 return ARES_ENOTFOUND;
219 fp = fopen(PATH_HOSTS, "r");
227 return ARES_ENOTFOUND;
229 DEBUGF(fprintf(stderr, "fopen() failed with error: %d %s\n",
230 error, strerror(error)));
231 DEBUGF(fprintf(stderr, "Error opening file: %s\n",
237 while ((status = ares__get_hostent(fp, family, host)) == ARES_SUCCESS)
239 if (family != (*host)->h_addrtype)
241 ares_free_hostent(*host);
244 if (family == AF_INET)
246 if (memcmp((*host)->h_addr, &addr->addr4, sizeof(struct in_addr)) == 0)
249 else if (family == AF_INET6)
251 if (memcmp((*host)->h_addr, &addr->addr6, sizeof(struct in6_addr)) == 0)
254 ares_free_hostent(*host);
257 if (status == ARES_EOF)
258 status = ARES_ENOTFOUND;
259 if (status != ARES_SUCCESS)