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/* ISC license. */
#include <string.h>
#include <errno.h>
#include <skalibs/types.h>
#include <skalibs/sgetopt.h>
#include <skalibs/strerr.h>
#include <skalibs/stralloc.h>
#include <skalibs/buffer.h>
#include <skalibs/tai.h>
#include <skalibs/random.h>
#include <s6-dns/s6dns-rci.h>
#include <s6-dns/hosts.h>
#include <s6-dns/s6dns-resolve.h>
#define USAGE "s6-dnsip4 [ -q ] [ -H | -h ] [ -r ] [ -t timeout ] domain"
#define dieusage() strerr_dieusage(100, USAGE)
int main (int argc, char const *const *argv)
{
stralloc ips = STRALLOC_ZERO ;
tain deadline ;
unsigned int t = 0 ;
int flagqualify = 0 ;
int flaghosts = 0 ;
int flagunsort = 0 ;
int r = 0 ;
PROG = "s6-dnsip4" ;
{
subgetopt l = SUBGETOPT_ZERO ;
for (;;)
{
int opt = subgetopt_r(argc, argv, "qHhrt:", &l) ;
if (opt == -1) break ;
switch (opt)
{
case 'q' : flagqualify = 1 ; break ;
case 'H' : flaghosts = 0 ; break ;
case 'h' : flaghosts = 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") ;
if (flaghosts)
{
flaghosts = s6dns_hosts_init(&s6dns_hosts_here, "/etc/hosts", "/etc/hosts.cdb", "/tmp/hosts.cdb") ;
if (flaghosts == -1) strerr_diefu1sys(111, "initialize hosts database from /etc/hosts or /etc/hosts.cdb") ;
}
if (flaghosts)
{
r = flagqualify ? s6dns_hosts_a_q(argv[0], &ips) : s6dns_hosts_a_noq(argv[0], &ips) ;
if (r == -1) strerr_diefu3sys(111, "look up ", argv[0], " in hosts database") ;
}
if (!r)
{
r = s6dns_resolve_a_g(&ips, argv[0], strlen(argv[0]), flagqualify, &deadline) ;
if (r == -1) 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 (size_t i = 0 ; i < ips.len / 4 ; i++)
{
char fmt[IP4_FMT] ;
size_t n = ip4_fmt(fmt, ips.s + 4 * i) ;
fmt[n++] = '\n' ;
if (buffer_put(buffer_1small, fmt, n) == -1)
strerr_diefu1sys(111, "write to stdout") ;
}
if (!buffer_flush(buffer_1small))
strerr_diefu1sys(111, "write to stdout") ;
return 0 ;
}
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