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
|
/*
* tclUnixSock.c --
*
* This file contains Unix-specific socket related code.
*
* Copyright (c) 1995 Sun Microsystems, Inc.
*
* See the file "license.terms" for information on usage and redistribution
* of this file, and for a DISCLAIMER OF ALL WARRANTIES.
*
* RCS: @(#) $Id: tclUnixSock.c,v 1.6 2002/02/27 01:16:43 hobbs Exp $
*/
#include "tcl.h"
#include "tclPort.h"
/*
* There is no portable macro for the maximum length
* of host names returned by gethostbyname(). We should only
* trust SYS_NMLN if it is at least 255 + 1 bytes to comply with DNS
* host name limits.
*
* Note: SYS_NMLN is a restriction on "uname" not on gethostbyname!
*
* For example HP-UX 10.20 has SYS_NMLN == 9, while gethostbyname()
* can return a fully qualified name from DNS of up to 255 bytes.
*
* Fix suggested by Viktor Dukhovni (viktor@esm.com)
*/
#if defined(SYS_NMLN) && SYS_NMLEN >= 256
#define TCL_HOSTNAME_LEN SYS_NMLEN
#else
#define TCL_HOSTNAME_LEN 256
#endif
/*
* The following variable holds the network name of this host.
*/
static char hostname[TCL_HOSTNAME_LEN + 1];
static int hostnameInited = 0;
TCL_DECLARE_MUTEX(hostMutex)
/*
*----------------------------------------------------------------------
*
* Tcl_GetHostName --
*
* Returns the name of the local host.
*
* Results:
* A string containing the network name for this machine, or
* an empty string if we can't figure out the name. The caller
* must not modify or free this string.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
CONST char *
Tcl_GetHostName()
{
#ifndef NO_UNAME
struct utsname u;
struct hostent *hp;
#else
char buffer[sizeof(hostname)];
#endif
CONST char *native;
Tcl_MutexLock(&hostMutex);
if (hostnameInited) {
Tcl_MutexUnlock(&hostMutex);
return hostname;
}
native = NULL;
#ifndef NO_UNAME
(VOID *) memset((VOID *) &u, (int) 0, sizeof(struct utsname));
if (uname(&u) > -1) { /* INTL: Native. */
hp = gethostbyname(u.nodename); /* INTL: Native. */
if (hp == NULL) {
/*
* Sometimes the nodename is fully qualified, but gets truncated
* as it exceeds SYS_NMLN. See if we can just get the immediate
* nodename and get a proper answer that way.
*/
char *dot = strchr(u.nodename, '.');
if (dot != NULL) {
char *node = ckalloc((unsigned) (dot - u.nodename + 1));
memcpy(node, u.nodename, (size_t) (dot - u.nodename));
node[dot - u.nodename] = '\0';
hp = gethostbyname(node);
ckfree(node);
}
}
if (hp != NULL) {
native = hp->h_name;
} else {
native = u.nodename;
}
}
#else
/*
* Uname doesn't exist; try gethostname instead.
*/
if (gethostname(buffer, sizeof(buffer)) > -1) { /* INTL: Native. */
native = buffer;
}
#endif
if (native == NULL) {
hostname[0] = 0;
} else {
Tcl_ExternalToUtf(NULL, NULL, native, -1, 0, NULL, hostname,
sizeof(hostname), NULL, NULL, NULL);
}
hostnameInited = 1;
Tcl_MutexUnlock(&hostMutex);
return hostname;
}
/*
*----------------------------------------------------------------------
*
* TclpHasSockets --
*
* Detect if sockets are available on this platform.
*
* Results:
* Returns TCL_OK.
*
* Side effects:
* None.
*
*----------------------------------------------------------------------
*/
int
TclpHasSockets(interp)
Tcl_Interp *interp; /* Not used. */
{
return TCL_OK;
}
|
