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
|
/*
* lib/krb5/os/hostaddr.c
*
* Copyright 1990,1991 by the Massachusetts Institute of Technology.
* All Rights Reserved.
*
* Export of this software from the United States of America may
* require a specific license from the United States Government.
* It is the responsibility of any person or organization contemplating
* export to obtain such a license before exporting.
*
* WITHIN THAT CONSTRAINT, permission to use, copy, modify, and
* distribute this software and its documentation for any purpose and
* without fee is hereby granted, provided that the above copyright
* notice appear in all copies and that both that copyright notice and
* this permission notice appear in supporting documentation, and that
* the name of M.I.T. not be used in advertising or publicity pertaining
* to distribution of the software without specific, written prior
* permission. Furthermore if you modify this software you must label
* your software as modified software and not distribute it in such a
* fashion that it might be confused with the original M.I.T. software.
* M.I.T. makes no representations about the suitability of
* this software for any purpose. It is provided "as is" without express
* or implied warranty.
*
* This routine returns a list of krb5 addresses given a hostname.
*
*/
#define NEED_SOCKETS
#include "k5-int.h"
#include "fake-addrinfo.h"
krb5_error_code
krb5_os_hostaddr(krb5_context context, const char *name, krb5_address ***ret_addrs)
{
krb5_error_code retval;
krb5_address **addrs;
int i, j, r;
struct addrinfo hints, *ai, *aip;
if (!name)
return KRB5_ERR_BAD_HOSTNAME;
memset (&hints, 0, sizeof (hints));
hints.ai_flags = AI_NUMERICHOST;
/* We don't care what kind at this point, really, but without
this, we can get back multiple sockaddrs per address, for
SOCK_DGRAM, SOCK_STREAM, and SOCK_RAW. I haven't checked if
that's what the spec indicates. */
hints.ai_socktype = SOCK_DGRAM;
r = getaddrinfo (name, 0, &hints, &ai);
if (r && AI_NUMERICHOST != 0) {
hints.ai_flags &= ~AI_NUMERICHOST;
r = getaddrinfo (name, 0, &hints, &ai);
}
if (r)
return KRB5_ERR_BAD_HOSTNAME;
for (i = 0, aip = ai; aip; aip = aip->ai_next) {
switch (aip->ai_addr->sa_family) {
case AF_INET:
#ifdef KRB5_USE_INET6
case AF_INET6:
#endif
i++;
default:
/* Ignore addresses of unknown families. */
;
}
}
addrs = malloc ((i+1) * sizeof(*addrs));
if (!addrs)
return errno;
for (j = 0; j < i + 1; j++)
addrs[j] = 0;
for (i = 0, aip = ai; aip; aip = aip->ai_next) {
void *ptr;
size_t addrlen;
int atype;
switch (aip->ai_addr->sa_family) {
case AF_INET:
addrlen = sizeof (struct in_addr);
ptr = &((struct sockaddr_in *)aip->ai_addr)->sin_addr;
atype = ADDRTYPE_INET;
break;
#ifdef KRB5_USE_INET6
case AF_INET6:
addrlen = sizeof (struct in6_addr);
ptr = &((struct sockaddr_in6 *)aip->ai_addr)->sin6_addr;
atype = ADDRTYPE_INET6;
break;
#endif
default:
continue;
}
addrs[i] = (krb5_address *) malloc(sizeof(krb5_address));
if (!addrs[i]) {
retval = ENOMEM;
goto errout;
}
addrs[i]->magic = KV5M_ADDRESS;
addrs[i]->addrtype = atype;
addrs[i]->length = addrlen;
addrs[i]->contents = malloc(addrs[i]->length);
if (!addrs[i]->contents) {
retval = ENOMEM;
goto errout;
}
memcpy (addrs[i]->contents, ptr, addrs[i]->length);
i++;
}
*ret_addrs = addrs;
if (ai)
freeaddrinfo(ai);
return 0;
errout:
if (addrs) {
for (i = 0; addrs[i]; i++) {
free (addrs[i]->contents);
free (addrs[i]);
}
krb5_free_addresses(context, addrs);
}
if (ai)
freeaddrinfo(ai);
return retval;
}
|
