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refactor name_from_dns in hostname lookup backend 

loop over an address family / resource record mapping to avoid
repetitive code.
This commit is contained in:
Natanael Copa 2016-06-15 20:27:46 +02:00 committed by Rich Felker
parent 04bced403d
commit 4adc6c33e7
1 changed files with 12 additions and 13 deletions
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25
src/network/lookup_name.c
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@ -141,20 +141,19 @@ static int name_from_dns(struct address buf[static MAXADDRS], char canon[static
int qlens[2], alens[2];
int i, nq = 0;
struct dpc_ctx ctx = { .addrs = buf, .canon = canon };
static const struct { int af; int rr; } afrr[2] = {
{ .af = AF_INET6, .rr = RR_A },
{ .af = AF_INET, .rr = RR_AAAA },
};
if (family != AF_INET6) {
qlens[nq] = __res_mkquery(0, name, 1, RR_A, 0, 0, 0,
qbuf[nq], sizeof *qbuf);
if (qlens[nq] == -1)
return EAI_NONAME;
nq++;
}
if (family != AF_INET) {
qlens[nq] = __res_mkquery(0, name, 1, RR_AAAA, 0, 0, 0,
qbuf[nq], sizeof *qbuf);
if (qlens[nq] == -1)
return EAI_NONAME;
nq++;
for (i=0; i<2; i++) {
if (family != afrr[i].af) {
qlens[nq] = __res_mkquery(0, name, 1, afrr[i].rr,
0, 0, 0, qbuf[nq], sizeof *qbuf);
if (qlens[nq] == -1)
return EAI_NONAME;
nq++;
}
}
if (__res_msend_rc(nq, qp, qlens, ap, alens, sizeof *abuf, conf) < 0)