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In recv_done(), when dig decides to start the lookup's next query in
the line using `start_udp()` or `start_tcp()`, and for some reason,
no queries get started, dig doesn't cancel the lookup.
This can occur, for example, when there are two queries in the lookup,
one with a regular IP address, and another with a IPv4 mapped IPv6
address. When the regular IP address fails to serve the query, its
`recv_done()` callback starts the next query in the line (in this
case the one with a mapped IP address), but because `dig` doesn't
connect to such IP addresses, and there are no other queries in the
list, no new queries are being started, and the lookup keeps hanging.
After calling `start_udp()` or `start_tcp()` in `recv_done()`, check
if there are no pending/working queries then cancel the lookup instead
of only detaching from the current query.
(cherry picked from commit
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| .. | ||
| .gitignore | ||
| dig.c | ||
| dig.rst | ||
| dighost.c | ||
| dighost.h | ||
| host.c | ||
| host.rst | ||
| Makefile.am | ||
| nslookup.c | ||
| nslookup.rst | ||
| readline.h | ||