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
|
/*++
/* NAME
/* dns_sa_to_rr 3
/* SUMMARY
/* socket address to resource record
/* SYNOPSIS
/* #include <dns.h>
/*
/* DNS_RR *dns_sa_to_rr(hostname, pref, sa)
/* const char *hostname;
/* unsigned pref;
/* struct sockaddr *sa;
/* DESCRIPTION
/* dns_sa_to_rr() converts a socket address into a DNS resource record.
/*
/* Arguments:
/* .IP hostname
/* The resource record host name. This will be both the qname
/* and the rname in the synthetic DNS resource record.
/* .IP pref
/* The resource record MX host preference, if applicable.
/* .IP sa
/* Binary address.
/* DIAGNOSTICS
/* The result is a null pointer in case of problems, with the
/* errno variable set to indicate the problem type.
/* LICENSE
/* .ad
/* .fi
/* The Secure Mailer license must be distributed with this software.
/* AUTHOR(S)
/* Wietse Venema
/* IBM T.J. Watson Research
/* P.O. Box 704
/* Yorktown Heights, NY 10598, USA
/*--*/
/* System libraries. */
#include <sys_defs.h>
#include <errno.h>
/* Utility library. */
#include <msg.h>
/* DNS library. */
#include <dns.h>
/* dns_sa_to_rr - socket address to resource record */
DNS_RR *dns_sa_to_rr(const char *hostname, unsigned pref, struct sockaddr *sa)
{
#define DUMMY_TTL 0
if (sa->sa_family == AF_INET) {
return (dns_rr_create(hostname, hostname, T_A, C_IN, DUMMY_TTL, pref,
(char *) &SOCK_ADDR_IN_ADDR(sa),
sizeof(SOCK_ADDR_IN_ADDR(sa))));
#ifdef HAS_IPV6
} else if (sa->sa_family == AF_INET6) {
return (dns_rr_create(hostname, hostname, T_AAAA, C_IN, DUMMY_TTL, pref,
(char *) &SOCK_ADDR_IN6_ADDR(sa),
sizeof(SOCK_ADDR_IN6_ADDR(sa))));
#endif
} else {
errno = EAFNOSUPPORT;
return (0);
}
}
/*
* Stand-alone test program.
*/
#ifdef TEST
#include <stdlib.h>
#include <vstream.h>
#include <myaddrinfo.h>
#include <inet_proto.h>
#include <mymalloc.h>
static const char *myname;
static NORETURN usage(void)
{
msg_fatal("usage: %s hostname", myname);
}
static int compare_family(const void *a, const void *b)
{
struct addrinfo *resa = *(struct addrinfo **) a;
struct addrinfo *resb = *(struct addrinfo **) b;
return (resa->ai_family - resb->ai_family);
}
int main(int argc, char **argv)
{
MAI_HOSTADDR_STR hostaddr;
struct addrinfo *res0;
struct addrinfo *res;
struct addrinfo **resv;
size_t len, n;
DNS_RR *rr;
int aierr;
myname = argv[0];
if (argc < 2)
usage();
inet_proto_init(argv[0], INET_PROTO_NAME_ALL);
while (*++argv) {
if ((aierr = hostname_to_sockaddr(argv[0], (char *) 0, 0, &res0)) != 0)
msg_fatal("%s: %s", argv[0], MAI_STRERROR(aierr));
for (len = 0, res = res0; res != 0; res = res->ai_next)
len += 1;
resv = (struct addrinfo **) mymalloc(len * sizeof(*resv));
for (len = 0, res = res0; res != 0; res = res->ai_next)
resv[len++] = res;
qsort((void *) resv, len, sizeof(*resv), compare_family);
for (n = 0; n < len; n++) {
if ((rr = dns_sa_to_rr(argv[0], 0, resv[n]->ai_addr)) == 0)
msg_fatal("dns_sa_to_rr: %m");
if (dns_rr_to_pa(rr, &hostaddr) == 0)
msg_fatal("dns_rr_to_pa: %m");
vstream_printf("%s -> %s\n", argv[0], hostaddr.buf);
vstream_fflush(VSTREAM_OUT);
dns_rr_free(rr);
}
freeaddrinfo(res0);
myfree((void *) resv);
}
return (0);
}
#endif
|
