1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
|
/*
* $XConsortium: gethost.c,v 1.22 94/11/30 16:29:52 kaleb Exp $
*
*
Copyright (c) 1989 X Consortium
Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:
The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.
THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
X CONSORTIUM BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN
AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
Except as contained in this notice, the name of the X Consortium shall not be
used in advertising or otherwise to promote the sale, use or other dealings
in this Software without prior written authorization from the X Consortium.
* *
* Author: Jim Fulton, MIT X Consortium
*/
/* sorry, streams support does not really work yet */
#if defined(STREAMSCONN) && defined(SVR4)
#undef STREAMSCONN
#define TCPCONN
#endif
#ifdef WIN32
#include <winsock.h>
#define EPROTOTYPE WSAEPROTOTYPE
#endif
#include "xauth.h"
#include <X11/X.h>
#include <signal.h>
#include <setjmp.h>
#include <ctype.h>
#ifndef __TYPES__
#include <sys/types.h>
#define __TYPES__
#endif
#ifndef WIN32
#ifndef STREAMSCONN
#include <sys/socket.h>
#include <netdb.h>
#include <netinet/in.h>
#ifdef SYSV
#ifdef i386
#ifndef SCO
#include <net/errno.h>
#endif /* !SCO */
#endif /* i386 */
#endif /* SYSV */
#endif /* !STREAMSCONN */
#endif /* !WIN32 */
#include <errno.h>
#ifdef X_NOT_STDC_ENV
extern int errno;
#endif
#ifdef DNETCONN
#include <netdnet/dn.h>
#include <netdnet/dnetdb.h>
#endif
#ifdef SIGALRM
Bool nameserver_timedout = False;
/*
* get_hostname - Given an internet address, return a name (CHARON.MIT.EDU)
* or a string representing the address (18.58.0.13) if the name cannot
* be found. Stolen from xhost.
*/
static jmp_buf env;
static
#ifdef SIGNALRETURNSINT
int
#else
void
#endif
nameserver_lost(sig)
{
nameserver_timedout = True;
longjmp (env, -1);
/* NOTREACHED */
#ifdef SIGNALRETURNSINT
return -1; /* for picky compilers */
#endif
}
#endif
char *get_hostname (auth)
Xauth *auth;
{
struct hostent *hp = NULL;
#ifndef WIN32
char *inet_ntoa();
#endif
#ifdef DNETCONN
struct nodeent *np;
static char nodeaddr[4 + 2 * DN_MAXADDL];
#endif /* DNETCONN */
if (auth->address_length == 0)
return "Illegal Address";
#ifdef TCPCONN
if (auth->family == FamilyInternet) {
#ifdef SIGALRM
/* gethostbyaddr can take a LONG time if the host does not exist.
Assume that if it does not respond in NAMESERVER_TIMEOUT seconds
that something is wrong and do not make the user wait.
gethostbyaddr will continue after a signal, so we have to
jump out of it.
*/
nameserver_timedout = False;
signal (SIGALRM, nameserver_lost);
alarm (4);
if (setjmp(env) == 0) {
#endif
hp = gethostbyaddr (auth->address, auth->address_length, AF_INET);
#ifdef SIGALRM
}
alarm (0);
#endif
if (hp)
return (hp->h_name);
else
return (inet_ntoa(*((struct in_addr *)(auth->address))));
}
#endif
#ifdef DNETCONN
if (auth->family == FamilyDECnet) {
struct dn_naddr *addr_ptr = (struct dn_naddr *) auth->address;
if (np = getnodebyaddr(addr_ptr->a_addr, addr_ptr->a_len, AF_DECnet)) {
sprintf(nodeaddr, "%s:", np->n_name);
} else {
sprintf(nodeaddr, "%s:", dnet_htoa(auth->address));
}
return(nodeaddr);
}
#endif
return (NULL);
}
#ifdef TCPCONN
/*
* cribbed from lib/X/XConnDis.c
*/
static Bool get_inet_address (name, resultp)
char *name;
unsigned long *resultp; /* return */
{
unsigned long hostinetaddr = inet_addr (name);
struct hostent *host_ptr;
struct sockaddr_in inaddr; /* dummy variable for size calcs */
if (hostinetaddr == -1) { /* oh, gross.... */
if ((host_ptr = gethostbyname (name)) == NULL) {
/* No such host! */
errno = EINVAL;
return False;
}
/* Check the address type for an internet host. */
if (host_ptr->h_addrtype != AF_INET) {
/* Not an Internet host! */
errno = EPROTOTYPE;
return False;
}
memmove( (char *)&hostinetaddr, (char *)host_ptr->h_addr,
sizeof(inaddr.sin_addr));
}
*resultp = hostinetaddr;
return True;
}
#endif
#ifdef DNETCONN
static Bool get_dnet_address (name, resultp)
char *name;
struct dn_naddr *resultp;
{
struct dn_naddr *dnaddrp, dnaddr;
struct nodeent *np;
if (dnaddrp = dnet_addr (name)) { /* stolen from xhost */
dnaddr = *dnaddrp;
} else {
if ((np = getnodebyname (name)) == NULL) return False;
dnaddr.a_len = np->n_length;
memmove( dnaddr.a_addr, np->n_addr, np->n_length);
}
*resultp = dnaddr;
return True;
}
#endif
char *get_address_info (family, fulldpyname, prefix, host, lenp)
int family;
char *fulldpyname;
int prefix;
char *host;
int *lenp;
{
char *retval = NULL;
int len = 0;
char *src = NULL;
#ifdef TCPCONN
unsigned long hostinetaddr;
struct sockaddr_in inaddr; /* dummy variable for size calcs */
#endif
#ifdef DNETCONN
struct dn_naddr dnaddr;
#endif
char buf[255];
/*
* based on the family, set the pointer src to the start of the address
* information to be copied and set len to the number of bytes.
*/
switch (family) {
case FamilyLocal: /* hostname/unix:0 */
/* handle unix:0 and :0 specially */
if (prefix == 0 && (strncmp (fulldpyname, "unix:", 5) == 0 ||
fulldpyname[0] == ':')) {
extern char *get_local_hostname();
if (!get_local_hostname (buf, sizeof buf)) {
len = 0;
} else {
src = buf;
len = strlen (buf);
}
} else {
src = fulldpyname;
len = prefix;
}
break;
case FamilyInternet: /* host:0 */
#ifdef TCPCONN
if (!get_inet_address (host, &hostinetaddr)) return NULL;
src = (char *) &hostinetaddr;
len = 4; /* sizeof inaddr.sin_addr, would fail on Cray */
break;
#else
return NULL;
#endif
case FamilyDECnet: /* host::0 */
#ifdef DNETCONN
if (!get_dnet_address (host, &dnaddr)) return NULL;
src = (char *) &dnaddr;
len = (sizeof dnaddr);
break;
#else
/* fall through since we don't have code for it */
#endif
default:
src = NULL;
len = 0;
}
/*
* if source was provided, allocate space and copy it
*/
if (len == 0 || !src) return NULL;
retval = malloc (len);
if (retval) {
memmove( retval, src, len);
*lenp = len;
}
return retval;
}
|
