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
|
/* ISC license. */
#include <string.h>
#include <errno.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/genalloc.h>
#include <skalibs/random.h>
#include <s6-dns/s6dns.h>
#define USAGE "s6-dnsmx [ -q ] [ -r ] [ -t timeout ] name"
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
genalloc mxs = GENALLOC_ZERO ; /* array of s6dns_message_rr_mx_t */
tain deadline ;
unsigned int t = 0 ;
int flagqualify = 0 ;
int flagunsort = 0 ;
int r ;
PROG = "s6-dnsmx" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "qrt:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'q' : flagqualify = 1 ; break ;
case 'r' : flagunsort = 1 ; break ;
case 't' : if (!uint0_scan(l.arg, &t)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= l.ind ; argv += l.ind ;
}
if (argc < 1) dieusage() ;
tain_now_set_stopwatch_g() ;
if (t) tain_from_millisecs(&deadline, t) ; else deadline = tain_infinite_relative ;
tain_add_g(&deadline, &deadline) ;
if (!s6dns_rci_init(&s6dns_rci_here, "/etc/resolv.conf"))
strerr_diefu1sys(111, "initialize structures from /etc/resolv.conf") ;
r = s6dns_resolve_mx_g(&mxs, argv[0], strlen(argv[0]), flagqualify, &deadline) ;
if (r < 0) strerr_diefu2sys((errno == ETIMEDOUT) ? 99 : 111, "resolve ", argv[0]) ;
if (!r) strerr_diefu4x(2, "resolve ", argv[0], ": ", s6dns_constants_error_str(errno)) ;
if (!genalloc_len(s6dns_message_rr_mx_t, &mxs)) return 1 ;
if (flagunsort) random_unsort(mxs.s, genalloc_len(s6dns_message_rr_mx_t, &mxs), sizeof(s6dns_message_rr_mx_t)) ;
for (size_t i = 0 ; i < genalloc_len(s6dns_message_rr_mx_t, &mxs) ; i++)
{
char buf[S6DNS_FMT_MX] ;
size_t len = s6dns_fmt_mx(buf, S6DNS_FMT_MX, genalloc_s(s6dns_message_rr_mx_t, &mxs) + i) ;
if (!len) strerr_diefu1sys(111, "format result") ;
if (buffer_put(buffer_1, buf, len) < (ssize_t)len) goto err ;
if (buffer_put(buffer_1, "\n", 1) < 1) goto err ;
}
if (!buffer_flush(buffer_1)) goto err ;
return 0 ;
err:
strerr_diefu1sys(111, "write to stdout") ;
}
|
