Closes #2130. Thanks to becz.

<arpa/inet.h> header is required to compile this source. Without it, WARNING is generated.

mosquitto/lib/socks_mosq.c: In function 'socks5__send':
mosquitto/lib/socks_mosq.c:156:22: warning: implicit declaration of function 'inet_pton' [-Wimplicit-function-declaration]
   ipv4_pton_result = inet_pton(AF_INET, mosq->host, &addr_ipv4);

Signed-off-by: ChangJoon Lee <changjoon.lee@lge.com>

In some circumstances, Mosquitto could leak memory when handling PUBLISH messages. This is limited to incoming QoS 2 messages, and is related to the combination of the broker having persistence enabled, a clean session=false client, which was connected prior to the broker restarting, then has reconnected and has now sent messages at a sufficiently high rate that the incoming queue at the broker has filled up and hence messages are being dropped. This is more likely to have an effect where max_queued_messages is a small value. This has now been fixed.

Closes #1793.

Closes #1412. Thanks to Ryan Shaw.

Closes #1174. Thanks to beville.

Bug: https://github.com/eclipse/mosquitto/issues/1174

Closes #1032. Thanks to jkoopman, Joseph Benden and Ari Suutari.

Bug: https://github.com/eclipse/mosquitto/issues/1032

1398654, 1398656 - lib missing unlock on fatal protocol error
1398655 - broker potential double free on startup after fatal persist
          error.

Follow-up of 70c4097b

.

Signed-off-by: Timo Gurr <timo.gurr@gmail.com>

This only affects the case where a client connects using a username, and
the anonymous ACL list is defined but specific user ACLs are not
defined.

Closes #1162. Thanks to quonb.

This was leaving dangling messages that were never freed.

Closes #389. Thanks to pjchx.

Closes #1154. Thanks to Guzoft.

This now returns MOSQ_ERR_INVAL as expected.

Thanks to momoskitto.

Produce error if this is not the case. Closes #1164, thanks to
momoskitto.

Closes #1144. Thanks to Kris Mattheus.

This occurred when per_listener_settings was set to true.

Closes #1081. Thanks to dwin-wangjt.