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#include "uint16.h"
#include "strerr.h"
#include "buffer.h"
#include "scan.h"
#include "str.h"
#include "byte.h"
#include "error.h"
#include "ip4.h"
#include "iopause.h"
#include "printpacket.h"
#include "parsetype.h"
#include "dns.h"
#define FATAL "dnsq: fatal: "
void usage(void)
{
strerr_die1x(100,"dnsq: usage: dnsq type name server");
}
void oops(void)
{
strerr_die2sys(111,FATAL,"unable to parse: ");
}
static struct dns_transmit tx;
int resolve(char *q,char qtype[2],char servers[64])
{
struct taia stamp;
struct taia deadline;
iopause_fd x[1];
int r;
if (dns_transmit_start(&tx,servers,0,q,qtype,"\0\0\0\0") == -1) return -1;
for (;;) {
taia_now(&stamp);
taia_uint(&deadline,120);
taia_add(&deadline,&deadline,&stamp);
dns_transmit_io(&tx,x,&deadline);
iopause(x,1,&deadline,&stamp);
r = dns_transmit_get(&tx,x,&stamp);
if (r == -1) return -1;
if (r == 1) break;
}
return 0;
}
char servers[64];
static stralloc ip;
static stralloc fqdn;
char type[2];
static char *q;
static stralloc out;
static char seed[128];
int main(int argc,char **argv)
{
uint16 u16;
dns_random_init(seed);
if (!*argv) usage();
if (!*++argv) usage();
if (!parsetype(*argv,type)) usage();
if (!*++argv) usage();
if (!dns_domain_fromdot(&q,*argv,str_len(*argv))) oops();
if (!*++argv) usage();
if (!stralloc_copys(&out,*argv)) oops();
if (dns_ip4_qualify(&ip,&fqdn,&out) == -1) oops();
if (ip.len >= 64) ip.len = 64;
byte_zero(servers,64);
byte_copy(servers,ip.len,ip.s);
if (!stralloc_copys(&out,"")) oops();
uint16_unpack_big(type,&u16);
if (!stralloc_catulong0(&out,u16,0)) oops();
if (!stralloc_cats(&out," ")) oops();
if (!dns_domain_todot_cat(&out,q)) oops();
if (!stralloc_cats(&out,":\n")) oops();
if (resolve(q,type,servers) == -1) {
if (!stralloc_cats(&out,error_str(errno))) oops();
if (!stralloc_cats(&out,"\n")) oops();
}
else {
if (!printpacket_cat(&out,tx.packet,tx.packetlen)) oops();
}
buffer_putflush(buffer_1,out.s,out.len);
_exit(0);
}
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