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dns: handle early eof in tcp fallback

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A zero returned from recvmsg is currently treated as if some data were
received, so if a DNS server closes its TCP socket before sending the
full answer, __res_msend_rc will spin until the timeout elapses because
POLLIN event will be reported on each poll. Fix this by treating an
early EOF as an error.
This commit is contained in:
Alexey Izbyshev 2023-02-24 23:48:55 +03:00 committed by Rich Felker
parent 9b132e5567
commit bec42ef393
1 changed files with 1 additions and 1 deletions
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2
src/network/res_msend.c
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@ -287,7 +287,7 @@ int __res_msend_rc(int nqueries, const unsigned char *const *queries,
};
step_mh(&mh, apos[i]);
r = recvmsg(pfd[i].fd, &mh, 0);
if (r < 0) goto out;
if (r <= 0) goto out;
apos[i] += r;
if (apos[i] < 2) continue;
int alen = alen_buf[i][0]*256 + alen_buf[i][1];