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introduced in cafc7f91306ea17ace4a6c3d76d81c8780c87452
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It seems that resources are properly deallocated by MHD_destroy_response,
even if enqueuing the request fails.
Also replace a trivial printf with alloca and fixup log message
(it'll now be something like "Connection from CN=some.host.name",
which seems clear enough.)
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Most of the messages we send do not require a allocating and
freeing a buffer, to optimize this by using const strings.
Also, rename respond_error to mhd_respond*, since it is used
not only for errors.
Make use of information from printf to avoid one extra call to
strlen.
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The whole tool is made dependent on µhttpd availability. It should be
easy to make the µhttpd parts conditional, but since transfer over
HTTP seems to be the primary use case, currently this is not done.
Current implementation uses nested epoll loops: sd-event is used for
the external event loop, and µhttpd uses epoll in its own
loop. Unfortunately µhttpd does not expose enough information to add
the descriptors it uses to the external event loop. This means that
starvation of other events is possible, if one of the inner µhttpd
loops is constantly busy. This means that µhttpd servers should not
be mixed with other sources.
The TLS authentication parts haven't been really tested properly, and
should not be take too seriously.
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If --trust=ca.crt is used, only clients presenting certificates signed
by the ca will be allowed to proceed. No hostname matching is
performed, so any client wielding a signed certificate will be
authorized.
Error functions are moved from journal-gateway to microhttp-util and
made non-static, since now they are used in two source files.
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Prefix "gnutls: " is added. Some semi-random mapping of gnutls levels
to syslog levels is done, but since gnutls levels seem to be used
rather loosely, most end up as debug.
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for non-static functions
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Clang is a bit more strict wrt format-nonliterals:
http://clang.llvm.org/docs/LanguageExtensions.html#format-string-checking
Adding these extra printf attributes also makes gcc able to find more
problems. E.g. this patch uncovers a format issue in udev-builtin-path_id.c
Some parts looked intetional about breaking the format-nonliteral check.
I added some supression for warnings there.
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http://lists.freedesktop.org/archives/systemd-devel/2013-April/010510.html
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A prefix ("microhttpd: ") is added to the log lines to make it easy to
distinguish the source.
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