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* anders/diameter/string_decode/OTP-11952:
Let examples override default service options
Set {restrict_connections, false} in example server
Set {string_decode, false} in examples
Test {string_decode, false} in traffic suite
Add service_opt() string_decode
Strip potentially large terms when sending outgoing Diameter messages
Improve language consistency in diameter(1)
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To control whether stringish Diameter types are decoded to string or
left as binary. The motivation is the same as in the parent commit: to
avoid large strings being copied when incoming Diameter messages are
passed between processes; or *if* in the case of messages destined for
handle_request and handle_answer callbacks, since these are decoded in
the dedicated processes that the callbacks take place in. It would be
possible to do something about other messages without requiring an
option, but disabling the decode is the most effective.
The value is a boolean(), true being the default for backwards
compatibility. Setting false causes both diameter_caps records and
decoded messages to contain binary() in relevant places that previously
had string(): diameter_app(3) callbacks need to be prepared for the
change.
The Diameter types affected are OctetString and the derived types that
can contain arbitrarily large values: OctetString, UTF8String,
DiameterIdentity, DiameterURI, IPFilterRule, and QoSFilterRule. Time and
Address are unaffected.
The DiameterURI decode has been redone using re(3), which both
simplifies and does away with a vulnerability resulting from the
conversion of arbitrary strings to atom.
The solution continues the use and abuse of the process dictionary for
encode/decode purposes, last seen in commit 0f9cdba.
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To make the default DPA timeout configurable. The timeout say how many
milliseconds to wait for DPA in response to an outgoing DPR before
terminating the transport process regardless.
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Instead, add diameter_make:format_error/1 to allow the caller to format
if desired, which is what applications like compiler and yecc do. Use
this to check that the expected error is the one actually generated in
the compiler suite.
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* anders/diameter/timer_confusion/OTP-11168:
Rename reconnect_timer -> connect_timer
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The former was misleading since the timer only applies to initial
connection attempts, reconnection attempts being governed by
watchdog_timer. The name is a historic remnant from a (dark, pre-OTP)
time in which RFC 3539 was followed less slavishly than it is now, and
the timer actually did apply to reconnection attempts.
Note that connect_timer corresponds to RFC 6733 Tc, while watchdog_timer
corresponds to RFC 3539 TwInit. The latter RFC makes clear that TwInit
should apply to reconnection attempts. It's less clear if only RFC 6733
is read.
Note also that reconnect_timer is still accepted for backwards
compatibility. It would be possible to add an option to make
reconnect_timer behave strictly as the name suggests (ie. ignore RFC 3539
and interpret RFC 6733 at face value; something that has some value for
testing at least) but no such option is implemented in this commit.
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The commentary is not yet complete. It currently stops at chapter 4 of
the RFC.
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