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get_request_entity()'s purpose is to drain remaining unread bytes
in the request read pipe before handing out an error page,
and kinda surprisingly, also when connection to the stathost is
done.
in the stathost case tinyproxy just skipped proper processing and
jumped to the error handler code, and remembering whether a
connection to the stathost was desired in a variable, then doing
things a bit differently depending on whether it's set.
i tried to fix issues with get_request_entity in
88153e944f7d28f57cccc77f3228a3f54f78ce4e (which is basically the
right fix for the issue it tried to solve, but incomplete),
and resulting from there in 78cc5b72b18a3c0d196126bfbc5d3b6473386da9.
the latter fix wasn't quite right since we're not supposed to check
whether the socket is ready for writing, and having a return value
of 2 instead of 1 got resulted in some of the if statements not
kicking in when they should have.
this also resulted in the stathost page no longer working.
after in-depth study of the issue i realized that we only need to
call get_request_entity() when the headers aren't completely read,
additional to setting the proper connection timeout as
88153e944f7d28f57cccc77f3228a3f54f78ce4e already implemented.
the changes of 78cc5b72b18a3c0d196126bfbc5d3b6473386da9 have been
reverted.
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another fallout of the config refactoring finished by
2e02dce0c3de4a231f74b44c34647406de507768.
apparently no one using the ErrorFile directive used git master
during the last months, as there have been no reports about this issue.
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this allows to see in a backtrace from where the error was
triggered.
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this allows us in a next step to replace goto fail with a call to that
function, so we can see in a backtrace from where the failure was
triggered.
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in networking, hitting a timeout requires that *nothing* happens during the
interval. whenever anything happens, the timeout is reset.
there's no need to do custom time calculations, it's perfectly fine to let
the kernel handle it using the select() syscall.
additionally the code added in 0b9a74c29036f9215b2b97a301b7b25933054302
assures that read and write syscalls() don't block indefinitely and return
on the timeout too, so there's no need to switch sockets back and forth
between blocking/nonblocking.
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introduced in 88153e944f7d28f57cccc77f3228a3f54f78ce4e.
when connect method is used (HTTPS), and e.g. a filtered domain requested,
there's no data on readfds, only on writefds.
this caused the response from the connection to hang until the timeout was
hit. in the past in such scenario always a "no entity" response
was produced in tinyproxy logs.
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tested with 32K acl rules, generated by
for x in `seq 128` ; do for y in `seq 255` ; do \
echo "Deny 10.$x.$y.0/24" ; done ; done
after loading the config (which is dogslow too), tinyproxy
required 9.5 seconds for the acl check on every request.
after switching the list implementation to sblist, a request
with the full acl check now takes only 0.025 seconds.
the time spent for loading the config file is identical for both
list implementations, roughly 30 seconds.
(in a previous test, 65K acl rules were generated, but every
connection required almost 2 minutes to crunch through the list...)
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this allows to switch the underlying implementation easily.
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if there's a long list of acl's, doing full_inet_pton() over
and over with the same IP isn't really efficient.
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get_request_entity() is only called on error, for example if a client
doesn't pass a check_acl() check. in such a case it's possible that
the client fd isn't yet ready to read from.
using select() with a timeout timeval of {0,0} causes it to return
immediately and return 0 if there's no data ready to be read.
this resulted in immediate connection termination rather than returning
the 403 access denied error page to the client and a confusing
"no entity" message displayed in the proxy log.
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this allows to see them when the verbose INFO loglevel is not desired.
closes #78
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the code wrongly processed the site_spec (here: domain) parameter
only when PT_TYPE == PT_NONE.
re-arranged code to process it correctly whenever passed.
additionally the mask is now also applied to the passed subnet/ip,
so a site_spec like 127.0.0.1/8 is converted into 127.0.0.0/8.
also the case where inet_aton fails now produces a proper error
message.
note that the code still doesn't process ipv6 addresses and mask.
to support it, we should use the existing code in acl.c and refactor
it so it can be used from both call sites.
closes #83
closes #165
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previously, in order to detect and insert {variables} into error/stats
templates, tinyproxy iterated char-by-char over the input file, and would
try to parse anything inside {} pairs and treat it like a variable name.
this breaks CSS, and additionally it's dog slow as tinyproxy wrote every
single character to the client via a write syscall.
now we process line-by-line, and inspect all matches of the regex
\{[a-z]{1,32}\}. if the contents of the regex are a known variable name,
substitution is taking place. if not, the contents are passed as-is to
the client. also the chunks before and after matches are written in
a single syscall.
closes #108
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let's use POSIX LINE_MAX (usually 4KB) instead of 1KB.
closes #226
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this allows a tinyproxy session in terminal foreground mode to reload
its configuration without dropping active connections.
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it's quite unexpected for an application running foreground in a
terminal to keep running when the terminal is closed.
also in such a case (if file logging is disabled) there's no way to
see what's happening to the proxy.
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inet_ntoa() uses a static buffer and is therefore not threadsafe.
additionally it has been deprecated by POSIX.
by using inet_ntop() instead the code has been made ipv6 aware.
note that this codepath was only entered in the unlikely event that
no hosts header was being passed to the proxy, i.e. pre-HTTP/1.1.
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* check return values of memory allocation and abort gracefully
in out-of-memory situations
* use sblist (linear dynamic array) instead of linked list
- this removes one pointer per filter rule
- removes need to manually allocate/free every single list item
(instead block allocation is used)
- simplifies code
* remove storage of (unused) input rule
- removes one char* pointer per filter rule
- removes storage of the raw bytes of each filter rule
* add line number to display on out-of-memory/invalid regex situation
* replace duplicate filter_domain()/filter_host() code with a single
function filter_run()
- reduces code size and management effort
with these improvements, >1 million regex rules can be loaded with
4 GB of RAM, whereas previously it crashed with about 950K.
the list for testing was assembled from
http://www.shallalist.de/Downloads/shallalist.tar.gz
closes #20
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I was hit by this, and did not see anything in the log, connections was just hanging.
Think warning is a better log level
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this is useful to use upstream directive to null-route a specific target
domain.
e.g.
upstream http 0.0.0.0:0 ".adserver.com"
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the timeout option set by the config file wasn't respected at all
so it could happen that connections became stale and were never released,
which eventually caused tinyproxy to hit the limit of open connections and
never accepting new ones.
addresses #274
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regression introduced in f6d4da5d81694721bf50b2275621e7ce84e6da30.
this has been overlooked due to the assert macro being optimized out in
non-debug builds.
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getsockname() requires addrlen to be set to the size of the sockaddr struct
passed as the addr, and a check whether the returned addrlen exceeds the
initially passed size (to determine whether the address returned is truncated).
with a request like "GET /\r\n\r\n" where length is 0 this caused the code
to assume success and use the values of the uninitialized sockaddr struct.
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unlike other functions called from the config parser code,
anonymous_insert() accesses the global config variable rather than
passing it as an argument. however the global variable is only set
after successful loading of the entire config.
we fix this by adding a conf argument to each anonymous_* function,
passing the global pointer in calls done from outside the config
parser.
fixes #292
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... in case reloading of it after SIGHUP fails, the old config can
continue working.
(apart from the logging-related issue mentioned in 27d96df99900c5a62ab0fdf2a37565e78f256d6a )
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previously, default values were stored once into a static struct,
then on each reload item by item copied manually into a "new"
config struct.
this has proven to be errorprone, as additions in one of the 2
locations were not propagated to the second one, apart from
being simply a lot of gratuitous code.
we now simply load the default values directly into the config
struct to be used on each reload.
closes #283
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as a side effect of not updating the config pointer when loading
the config file fails, the "FIXME" level comment to take appropriate
action in that case has been removed. the only issue remaining
when receiving a SIGHUP and encountering a malformed config file would
now be the case that output to syslog/logfile won't be resumed, if
initially so configured.
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this is required so we can elegantly swap out an old config for a
new one in the future and remove lots of boilerplate from config
initialization code.
unfortunately this is a quite intrusive change as the config struct
was accessed in numerous places, but frankly it should have been
done via a pointer right from the start.
right now, we simply point to a static struct in main.c, so there
shouldn't be any noticeable changes in behaviour.
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since this is set via command line, we can deal with it easily
from where it is actually needed.
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since this option can't be set via config file, it makes sense
to factor it out and use it only where strictly needed, e.g. in
startup code.
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if daemon mode is used and neither logfile nor syslog options specified,
this is clearly a misconfiguration issue. don't try to be smart and work
around that, so less global state information is required.
also, this case is already checked for in main.c:334.
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LOG_DAEMON isn't specified in POSIX and the gratuitously different
treatment is in the way of a planned cleanup.
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it is quite easy to bring down a proxy server by forcing it to make
connections to one of its own ports, because this will result in an endless
loop spawning more and more connections, until all available fds are exhausted.
since there's a potentially infinite number of potential DNS/ip addresses
resolving to the proxy, it is impossible to detect an endless loop by simply
looking at the destination ip address and port.
what *is* possible though is to record the ip/port tuples assigned to outgoing
connections, and then compare them against new incoming connections. if they
match, the sender was the proxy itself and therefore needs to reject that
connection.
fixes #199.
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tinyproxy used to do a full hostname resolution whenever a new client
connection happened, which could cause very long delays (as reported in #198).
there's only a single place/scenario that actually requires a hostname, and
that is when an Allow/Deny rule exists for a hostname or domain, rather than
a raw IP address. since it is very likely this feature is not very widely used,
it makes absolute sense to only do the costly resolution when it is unavoidable.
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since the write syscall is used instead of stdio, accesses have been
safe already, but it's better to use a mutex anyway to prevent out-
of-order writes.
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if we don't handle these gracefully, pretty much every existing config
file will fail with an error, which is probably not very friendly.
the obsoleted config items can be made hard errors after the next
release.
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the existing codebase used an elaborate and complex approach for
its parallelism:
5 different config file options, namely
- MaxClients
- MinSpareServers
- MaxSpareServers
- StartServers
- MaxRequestsPerChild
were used to steer how (and how many) parallel processes tinyproxy
would spin up at start, how many processes at each point needed to
be idle, etc.
it seems all preforked processes would listen on the server port
and compete with each other about who would get assigned the new
incoming connections.
since some data needs to be shared across those processes, a half-
baked "shared memory" implementation was provided for this purpose.
that implementation used to use files in the filesystem, and since
it had a big FIXME comment, the author was well aware of how hackish
that approach was.
this entire complexity is now removed. the main thread enters
a loop which polls on the listening fds, then spins up a new
thread per connection, until the maximum number of connections
(MaxClients) is hit. this is the only of the 5 config options
left after this cleanup. since threads share the same address space,
the code necessary for shared memory access has been removed.
this means that the other 4 mentioned config option will now
produce a parse error, when encountered.
currently each thread uses a hardcoded default of 256KB per thread
for the thread stack size, which is quite lavish and should be
sufficient for even the worst C libraries, but people may want
to tweak this value to the bare minimum, thus we may provide a new
config option for this purpose in the future.
i suspect that on heavily optimized C libraries such a musl, a
stack size of 8-16 KB per thread could be sufficient.
since the existing list implementation in vector.c did not provide
a way to remove a single item from an existing list, i added my
own list implementation from my libulz library which offers this
functionality, rather than trying to add an ad-hoc, and perhaps
buggy implementation to the vector_t list code. the sblist
code is contained in an 80 line C file and as simple as it can get,
while offering good performance and is proven bugfree due to years
of use in other projects.
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http protocol requires different treatment of proxy auth vs server auth.
fixes #246
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