When a signal is caught we want to exit from the boost::asio loop.
However, we can't do this by pusing another handler onto the io_service,
since this will involve a malloc call, and this can cause a deadlock (if
the signal handler is invoked from within a malloc call).
Therefore we instead need to use the signal_set functionality of
boost::asio, which guarantees that signal handling is done without
issue.
When reporting the segfault we can't allocate any memory, since the
stack might have become corrupted. Using std::string allocates memory,
so we'll opt for the lower level fprintf().
* common/system.cpp, common/system.h: Add security_init(), a
function to initialise any security or crypto related libraries
used. This is required by recent version of libgcrypt when
using hash functions.
* server/server.cpp, tests/systemtest.cpp, tools/cypasswd.cpp:
Call security_init() in all programs that use security related
functions.
* common/system.h: Add a new exit status code indicating that no
ports were available in the dynamic range.
* server/server.cpp, common/system.cpp: When there are no ports
available, write an appropriate message, and a hint describing
how to allocate more.
* configure.ac: Add tests for more optional functions and headers.
* client/ObserverClient.cpp: Use alternative on systems which don't
have usleep().
* common/system.cpp: Implement gettimeofday for systems which don't
have it.
* server/CommListener.cpp: Add a note about supporting alternatives
to inet_ntop.
* server/CommUnixListener.cpp, server/server.cpp: Disable the unix
listen socket on systems which don't have it.
* tests/systemtest.cpp: Fix the test to work on systems without fork()
or kill(), and add a test for the substitute gettimeofday
implementation.
* common/system.h: Add prototypes for required C library functions
we implement on systems where they are missing.
* common/system.cpp: Adapt the system specific code for systems
which are missing libc functions are system calls, including
uname, getuid, nice, fork, kill and some of the signals.
* common/log.h, common/log.cpp: Add a new function to rotate
the logs, eliminate duplicate code by breaking out log opening
code into a static function.
* common/system.cpp: Add a HUP system call handler to rotate the logs.
* common/system.cpp: When creating a daemon, create the new session
earilier, and change current working directory to / to ensure the
daemon does not interfere with the system.
* common/system.cpp: Return 0 on security check fail, as -1 is
signed.
* server/Connection.cpp: Re-order logging messages so that messages
reflect the fact the a broken connection occurs before the
subscriptions associated with that connection can be dropped.
Implement logging out just specific objects without closing the
connection.
* common/system.cpp, common/system.h: Add a function to increment nice
value for the server. Change security check to return unsigned, as
the magic number is in fact unsigned.
* server/server.cpp: Call system function to increment nice, thus
reducing priority once setup is complete.
* common/system.h, common/system.cpp: Add security check function
which for now just ensures cyphesis is not run as root.
* server/server.cpp: Use security check function when starting
the server.
* common/system.cpp: Make sure cassert is included before assert
macro is used.
* common/Makefile.am: Add missing header.
* data/Makefile.am: Install copies of the config files in
the documentation directory for reference.
* common/system.cpp, common/system.h: Add new functions for handling
encrypted password hashes with a salt, based on gcrypt rather
than openssl. Include legacy support for hashes without a salt.
* common/const.cpp: Add a salt to the default admin password.
* tests/systemtest.cpp: Modify the password tests to use the new
functions.
* server/Connection.cpp, server/Connection.h,
server/TrustedConnection.cpp, server/TrustedConnection.h:
Update the login code to use the new password functions.
* server/server.cpp, common/globals.cpp, client/client.cpp:
Workaround C++s nasty implicit conversion behavoir.
* common/system.cpp: Be smarted about POSIX signal handling for
segfaults and aborts.
* Update TODO.
* common/system.h, common/system.cpp: Add code to md5 hash
strings, like passwords.
* server/Connection.cpp: Use md5 hash code for storing and
verifying passwords.
* Use " instead of < when including application headers.
* Re-work the interface between server and worldrouter objects
so that the are less tied together, and more flexible.
* init script fixes.
* common/system.cpp: Ensure that parent of daemon exit status indicates
whether the daemon has started properlly.
* server/Connection.cpp: Clarify error reporting.
* common/system.h, common/system.cpp, server/server.cpp: Moved all
the system dependant signal handling and background handling
code into system module, and implemented propper handling of
going into the background, including reporting error status
back to the waiting parent using exit status and user signals.
