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
|
/* ISC license. */
#include <errno.h>
#include <skalibs/uint.h>
#include <skalibs/sgetopt.h>
#include <skalibs/bytestr.h>
#include <skalibs/strerr2.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/random.h>
#include <s6-dns/s6dns.h>
#define USAGE "s6-dnsip4 [ -q ] [ -r ] [ -t timeout ] domain"
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
stralloc ips = STRALLOC_ZERO ;
tain_t deadline ;
unsigned int i = 0 ;
int flagqualify = 0 ;
int flagunsort = 0 ;
PROG = "s6-dnsip4" ;
for (;;)
{
register int opt = subgetopt(argc, argv, "qrt:") ;
if (opt == -1) break ;
switch (opt)
{
case 'q' : flagqualify = 1 ; break ;
case 'r' : flagunsort = 1 ; break ;
case 't' : if (!uint0_scan(subgetopt_here.arg, &i)) dieusage() ; break ;
default : dieusage() ;
}
}
argc -= subgetopt_here.ind ; argv += subgetopt_here.ind ;
if (argc < 1) dieusage() ;
tain_now_g() ;
if (i) tain_from_millisecs(&deadline, i) ; else deadline = tain_infinite_relative ;
tain_add_g(&deadline, &deadline) ;
if (!s6dns_init()) strerr_diefu1sys(111, "s6dns_init") ;
{
register int r = s6dns_resolve_a_g(&ips, argv[0], str_len(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 (!ips.len) return 1 ;
if (flagunsort) random_unsort(ips.s, ips.len / 4, 4) ;
for (i = 0 ; i < ips.len / 4 ; i++)
{
char fmt[IP4_FMT] ;
register unsigned int n = ip4_fmt(fmt, ips.s + 4 * i) ;
fmt[n++] = '\n' ;
if (buffer_put(buffer_1small, fmt, n) < (int)n)
strerr_diefu1sys(111, "write to stdout") ;
}
if (!buffer_flush(buffer_1small))
strerr_diefu1sys(111, "write to stdout") ;
return 0 ;
}
|
