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version 0.73.0

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nilopaim
2023-07-14 12:15:30 -03:00
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lockserver/INSTALL
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LockServer Installation
-----------------------
Installation of the lockserver is fairly straightforward.
1) Untar the package.
2) cd into the directory edit any desired #define's in the lockserver.c.
Note that the default home for LockServer is /usr/local/lockserver and
it expects everything to live in that directory. Make sure that this
directory will be readable/writable to the user who will be executing
lockserver.
3) Do a make.
4) Copy the binary (lockserver) to the home directory.
5) Make sure the file "hosts" exists in the home directory. Each IP
(NOT THE HOSTNAME!) that you want to be able to have access the lockserver
needs to be listed on a separate line in this file.
6) Run the lockserver binary. 8) It will automagically daemonize itself. For
information on signals, usage, and client information, please view PROTOCOL
which should be located in the source directory.
lockserver/LICENSE
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GNU GENERAL PUBLIC LICENSE
Version 2, June 1991
Copyright (C) 1989, 1991 Free Software Foundation, Inc.
59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
Everyone is permitted to copy and distribute verbatim copies
of this license document, but changing it is not allowed.
Preamble
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<one line to give the program's name and a brief idea of what it does.>
Copyright (C) 19yy <name of author>
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Also add information on how to contact you by electronic and paper mail.
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Gnomovision version 69, Copyright (C) 19yy name of author
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This is free software, and you are welcome to redistribute it
under certain conditions; type `show c' for details.
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You should also get your employer (if you work as a programmer) or your
school, if any, to sign a "copyright disclaimer" for the program, if
necessary. Here is a sample; alter the names:
Yoyodyne, Inc., hereby disclaims all copyright interest in the program
`Gnomovision' (which makes passes at compilers) written by James Hacker.
<signature of Ty Coon>, 1 April 1989
Ty Coon, President of Vice
This General Public License does not permit incorporating your program into
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consider it more useful to permit linking proprietary applications with the
library. If this is what you want to do, use the GNU Library General
Public License instead of this License.
lockserver/Makefile
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# Generated automatically from Makefile.in by configure.
#
# Makefile.in for the Tiny COBOL compiler
#
SHELL=/bin/sh
prefix=/usr/local
exec_prefix=${prefix}
RM= rm -f
MKDIR=mkdir -p
INSTALL=/usr/bin/install -c
INSTALL_DATA=${INSTALL} -m 644
CCX=gcc
INSTBIN=${prefix}/bin
INSTRC=${prefix}/lockserver
RCFILE=hosts
#
INCLUDES=-I/usr/include -I/usr/local/include -I../lib -I../
CCXFLAGS=${INCLUDES} -Wall -pedantic -Wno-long-long
LIBS=-L/usr/lib -L/usr/local/lib
LDFLAGS=
MAKEDEPEND=@MAKEDEPEND@
#
# Rules for compiling .c sources
#
.SUFFIX: .c .o
.c.o:
$(CCX) $(CCXFLAGS) -c $<
SRCS = lockserver.c
OBJS = lockserver.o
PROG=lockserver
all: $(PROG)
${PROG}: ${OBJS}
$(CCX) -g -o $@ ${OBJS} $(LDFLAGS) $(LIBS)
# strip $@
clean:
@$(RM) $(PROG) $(OBJS)
install: $(PROG)
strip $(PROG)
${INSTALL} -m 755 $(PROG) $(INSTBIN)/$(PROG)
$(MKDIR) $(INSTRC)
${INSTALL_DATA} $(RCFILE) $(INSTRC)/$(RCFILE)
lockserver/Makefile.0
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BASE = lockserver
DIR = .
${BASE}: Makefile ${DIR}/${BASE}.c
gcc -o ${BASE} -O2 -Wall ${DIR}/${BASE}.c ${CFLAGS} ${LIBS}
clean:
@rm -f ${BASE} *.o core
@echo Cleaned...
lockserver/Makefile.0.mingw
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BASE = lockserver
DIR = .
${BASE}: Makefile ${DIR}/${BASE}.c
gcc -o ${BASE} -O2 -Wall ${DIR}/${BASE}.c ${CFLAGS} ${LIBS} -lwsock32
clean:
@rm -f ${BASE} *.o core
@echo Cleaned...
lockserver/Makefile.in
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#
# Makefile.in for the Tiny COBOL compiler
#
SHELL=/bin/sh
@SET_MAKE@
prefix=@prefix@
exec_prefix=@exec_prefix@
RM= rm -f
MKDIR=mkdir -p
INSTALL=@INSTALL@
INSTALL_DATA=@INSTALL_DATA@
CCX=@CC@
INSTBIN=${prefix}/bin
INSTRC=${prefix}/lockserver
RCFILE=hosts
#
INCLUDES=@INCLUDES@
CCXFLAGS=${INCLUDES} @CCXFLAGS@ -Wall -pedantic -Wno-long-long
LIBS=@LIBS@
LDFLAGS=@LDFLAGS@
MAKEDEPEND=@MAKEDEPEND@
#
# Rules for compiling .c sources
#
.SUFFIX: .c .o
.c.o:
$(CCX) $(CCXFLAGS) -c $<
SRCS = lockserver.c
OBJS = lockserver.o
PROG=lockserver
all: $(PROG)
${PROG}: ${OBJS}
$(CCX) -g -o $@ ${OBJS} $(LDFLAGS) $(LIBS)
# strip $@
clean:
@$(RM) $(PROG) $(OBJS)
install: $(PROG)
strip $(PROG)
${INSTALL} -m 755 $(PROG) $(INSTBIN)/$(PROG)
$(MKDIR) $(INSTRC)
${INSTALL_DATA} $(RCFILE) $(INSTRC)/$(RCFILE)
lockserver/Makefile.mingw
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# Generated automatically from Makefile.in by configure.
#
# Makefile.in for the Tiny COBOL compiler
#
SHELL=/bin/sh
prefix=/usr/local
exec_prefix=${prefix}
RM= rm -f
MKDIR=mkdir -p
INSTALL=/usr/bin/ginstall -c
INSTALL_DATA=${INSTALL} -m 644
CCX=gcc
INSTBIN=${prefix}/bin
INSTRC=${prefix}/lockserver
RCFILE=hosts
#
INCLUDES=-I/usr/include -I../lib -I../
CCXFLAGS=${INCLUDES} -Wall -pedantic -Wno-long-long
LIBS=-L/usr/lib -lwsock32 -lm
LDFLAGS=
MAKEDEPEND=@MAKEDEPEND@
#
# Rules for compiling .c sources
#
.SUFFIX: .c .o
.c.o:
$(CCX) $(CCXFLAGS) -c $<
SRCS = lockserver.c
OBJS = lockserver.o
PROG=lockserver
all: $(PROG)
${PROG}: ${OBJS}
$(CCX) -g -o $@ ${OBJS} $(LDFLAGS) $(LIBS)
# strip $@
clean:
@$(RM) $(PROG) $(OBJS)
install: $(PROG)
strip $(PROG)
${INSTALL} -m 755 $(PROG) $(INSTBIN)/$(PROG)
$(MKDIR) $(INSTRC)
${INSTALL_DATA} $(RCFILE) $(INSTRC)/$(RCFILE)
lockserver/PROTOCOL
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LockServer 0.9b - 7/14/2000
---------------------------
This document is intended to overview both the network protocol used by
LockServer and some basic technical information on how it operates.
The initial connection to the LockServer goes through a minor amount of
authentication. When the connect occurs, the server checks for the existence
of the remote ip in the "hosts" file which (by default) lives in
/usr/local/lockserver. The server is polite enough to send a single byte 0
if the connection is not allowed and a 1 if it is.
Next, the lockserver expects a command followed by arguments for the command.
The commands are as follows (1 byte each):
Find lock owner: 0x1
Request a lock: 0x2
Find contention location: 0x3
Renew a lock: 0x4
Release specific lock: 0x5
Release all owned locks: 0x6
List lock contenders: 0x7
Retrieve Stats: 0x8
A lock is made up of the following integral parts:
TTW (Time To Wait) - How long a contending lock should exist without renewal,
while waiting for ownership.
TTL (Time To Live) - How long the lock should exist without renewal, once
lock ownership has been obtained.
key - For us, this equates to "which table in the database" are we locking.
It is a string with a max length of 256 characters.
index - Equates to "which row ID" are we locking. Also a string with a max
of 256 characters.
owner - A string listing who the owner/contender is. Max 256 character string.
priority - The priority value helps determine when the contender becomes an
owner. The server will first look at priority, and then queue time. 1 byte.
Commands:
* In all cases, when sending strings or calculating lengths, do not null
terminate.
* All integers > 1 byte should be sent MSB first.
Find lock owner
---------------
1) Send 1 byte length of key followed by the key.
2) Send 1 byte length of index followed by the index.
3) Read 1 byte length of owner followed by the owner.
Request a lock
--------------
1) Send 1 byte length of key followed by the key.
2) Send 1 byte length of index followed by the index.
3) Send 1 byte length of owner followed by the owner.
4) Send 2 byte TTL.
5) Send 2 byte TTW.
6) Send 1 byte priority.
7) Read 2 byte contender location.
Three comments about the above command. First of all, a result of 1 indicates
that you own the lock, 2 means you are first in line, etc. Secondly, a
result of 0 is a special case. This means that the lock request was rejected
because the server is currently in graceful shutdown mode. More on this
later. Finally, requesting a lock that already exists (same key, index, and
owner) will simply renew the lock.
Find contender location
-----------------------
1) Send 1 byte length of key followed by the key.
2) Send 1 byte length of index followed by the index.
3) Send 1 byte length of owner followed by the owner.
4) Read 2 byte contender location.
Renew a lock
------------
1) Send 1 byte length of key followed by the key.
2) Send 1 byte length of index followed by the index.
3) Send 1 byte length of owner followed by the owner.
4) Read 1 byte success/failure.
Release a specific lock
-----------------------
1) Send 1 byte length of key followed by the key.
2) Send 1 byte length of index followed by the index.
3) Send 1 byte length of owner followed by the owner.
4) Read 2 bytes # of locks removed.
With the specific lock release, sending an index of "*" will release all
lock contention for that key/owner pair.
Release all owned locks
-----------------------
1) Send 1 byte length of owner followed by the owner.
2) Read 2 bytes # of locks removed.
List all lock contenders
------------------------
1) Send 1 byte length of key followed by the key.
2) Read 2 byte # of contenders.
3) Loop reading following info for each contender.
A) 1 byte priority.
B) 2 byte TTL.
C) 2 byte TTW.
D) 1 byte size of index followed by the index.
E) 1 byte size of owner followed by the owner.
F) 1 byte - 0: not owner, !0: owner.
This function was mostly added as a debugging tool.
Retrieve Stats
--------------
1) Read 4 byte uptime (in seconds).
2) Read 4 byte # of lock requests.
3) Read 4 byte # of owner lookups.
4) Read 4 byte # of contender lookups.
5) Read 4 byte # of lock renewal requests.
6) Read 4 byte # of specific lock releases.
7) Read 4 byte # of general lock releases.
8) Read 4 byte # of lock dump requests.
9) Read 4 byte # of statistics requests.
10) Read (long) # of accepted connections.
11) Read (long) # of rejected (not in hosts file) connections.
12) Read (long) # of rejected (too busy) connections.
13) Read (long) # of current lock owners.
14) Read (long) # of current lock (non owner) contenders.
15) Read 2 byte # of currently active connections.
Signals
-------
The following signals call the "noble_death" function which will save all
the locks to a file (for reloading on restart), close all connections,
and (theoretically) exit cleanly.
SIGINT
SIGSTP
SIGSTOP
SIGSEGV (seg fault) Will attempt to do the same thing and dump core.
SIGHUP will reload config info (mostly just the host info for now).
SIGUSR1 will dump stats to the stat file and save the current lock list.
SIGSYS - Ok, yeah, I know, weird choice for a signal. It will probably
change. What this does is put the server into a mode where it will still
accept connections, but no new locks are allowed. Once all locks (both
owners and contenders) are cleaned out, it will call noble_death.
Arguments
---------
There is currently only one potential argument to LockServer: -d
This will turn on debug mode which is intended as an aid for client
developers. It will print out some (rather amusing at least) informational
messages during runtime to stderr.
Questions/comments/rants/money can be sent to me at cole@tuininga.org.
lockserver/README
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LockServer 0.9b - 7/14/2000
---------------------------
o What is LockServer?
- Where I work, we have need of row locking for a database that doesn't
provide it. The solution I came up with was to write a generic lock server
that could provide the functionality we needed.
o Ok, so how does it work?
- The server itself is network based, and so far it seems to handle load
reasonably well. Essentially, you make a request, it gets queued. The
server will return where you are in the queue.
o How does it REALLY work?
- The storage mechanism is basically implemented as a hash of linked
lists. At this point, it would be generous to describe the hash algorithm
as pathetic; anybody who wants to offer suggestions is certainly welcome to.
The protocol the lock server uses is described in the PROTOCOL document that
should accompany this package.
o What platforms does LockServer run on?
- To date, the LockServer has only been tried on linux (Intel and Sparc).
Portability was not a design concern so I'd be very interested to hear of
platforms it does and does not run on. Anybody wishing to work on making
it run on other platforms is encouraged to do so. Giving me access to
other platforms to allow me to port it would also be appreciated. You can
contact me a cole@tuininga.org.
o How do I use LockServer?
- At this point, the only client software I know is some proprietary
code that some coworkers wrote and cannot (unfotunately) be released under
the GPL. If anybody wishes to make client code to access LockServer, I
would be happy to make it available on my ftp server. Guidelines and
technical information on the LockServer are available in the PROTOCOL
document.
Thanks to Eric Johnson and Robert Holak for development ideas and testing.
lockserver/TODO
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- Clear by owner
- Clear ALL locks/queues
- Make hash algorithm load from dynamic library
- Autoconf!
- User authentication
- Encrypted connections
lockserver/VERSION
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1.0
lockserver/hosts
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127.0.0.1
lockserver/lockserver.c
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lockserver/syslog.h
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/* $OpenBSD: syslog.h,v 1.5 1998/02/10 18:41:57 deraadt Exp $ */
/* $NetBSD: syslog.h,v 1.14 1996/04/03 20:46:44 christos Exp $ */
/*
* Copyright (c) 1982, 1986, 1988, 1993
* The Regents of the University of California. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
* 3. All advertising materials mentioning features or use of this software
* must display the following acknowledgement:
* This product includes software developed by the University of
* California, Berkeley and its contributors.
* 4. Neither the name of the University nor the names of its contributors
* may be used to endorse or promote products derived from this software
* without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
* @(#)syslog.h 8.1 (Berkeley) 6/2/93
*/
#define _PATH_LOG "/dev/log"
/*
* priorities/facilities are encoded into a single 32-bit quantity, where the
* bottom 3 bits are the priority (0-7) and the top 28 bits are the facility
* (0-big number). Both the priorities and the facilities map roughly
* one-to-one to strings in the syslogd(8) source code. This mapping is
* included in this file.
*
* priorities (these are ordered)
*/
#define LOG_EMERG 0 /* system is unusable */
#define LOG_ALERT 1 /* action must be taken immediately */
#define LOG_CRIT 2 /* critical conditions */
#define LOG_ERR 3 /* error conditions */
#define LOG_WARNING 4 /* warning conditions */
#define LOG_NOTICE 5 /* normal but significant condition */
#define LOG_INFO 6 /* informational */
#define LOG_DEBUG 7 /* debug-level messages */
#define LOG_PRIMASK 0x07 /* mask to extract priority part (internal) */
/* extract priority */
#define LOG_PRI(p) ((p) & LOG_PRIMASK)
#define LOG_MAKEPRI(fac, pri) (((fac) << 3) | (pri))
#ifdef SYSLOG_NAMES
#define INTERNAL_NOPRI 0x10 /* the "no priority" priority */
/* mark "facility" */
#define INTERNAL_MARK LOG_MAKEPRI(LOG_NFACILITIES, 0)
typedef struct _code {
char *c_name;
int c_val;
} CODE;
CODE prioritynames[] = {
{ "alert", LOG_ALERT },
{ "crit", LOG_CRIT },
{ "debug", LOG_DEBUG },
{ "emerg", LOG_EMERG },
{ "err", LOG_ERR },
{ "error", LOG_ERR }, /* DEPRECATED */
{ "info", LOG_INFO },
{ "none", INTERNAL_NOPRI }, /* INTERNAL */
{ "notice", LOG_NOTICE },
{ "panic", LOG_EMERG }, /* DEPRECATED */
{ "warn", LOG_WARNING }, /* DEPRECATED */
{ "warning", LOG_WARNING },
{ NULL, -1 },
};
#endif
/* facility codes */
#define LOG_KERN (0<<3) /* kernel messages */
#define LOG_USER (1<<3) /* random user-level messages */
#define LOG_MAIL (2<<3) /* mail system */
#define LOG_DAEMON (3<<3) /* system daemons */
#define LOG_AUTH (4<<3) /* security/authorization messages */
#define LOG_SYSLOG (5<<3) /* messages generated internally by syslogd */
#define LOG_LPR (6<<3) /* line printer subsystem */
#define LOG_NEWS (7<<3) /* network news subsystem */
#define LOG_UUCP (8<<3) /* UUCP subsystem */
#define LOG_CRON (9<<3) /* clock daemon */
#define LOG_AUTHPRIV (10<<3) /* security/authorization messages (private) */
#define LOG_FTP (11<<3) /* ftp daemon */
/* other codes through 15 reserved for system use */
#define LOG_LOCAL0 (16<<3) /* reserved for local use */
#define LOG_LOCAL1 (17<<3) /* reserved for local use */
#define LOG_LOCAL2 (18<<3) /* reserved for local use */
#define LOG_LOCAL3 (19<<3) /* reserved for local use */
#define LOG_LOCAL4 (20<<3) /* reserved for local use */
#define LOG_LOCAL5 (21<<3) /* reserved for local use */
#define LOG_LOCAL6 (22<<3) /* reserved for local use */
#define LOG_LOCAL7 (23<<3) /* reserved for local use */
#define LOG_NFACILITIES 24 /* current number of facilities */
#define LOG_FACMASK 0x03f8 /* mask to extract facility part */
/* facility of pri */
#define LOG_FAC(p) (((p) & LOG_FACMASK) >> 3)
#ifdef SYSLOG_NAMES
CODE facilitynames[] = {
{ "auth", LOG_AUTH },
{ "authpriv", LOG_AUTHPRIV },
{ "cron", LOG_CRON },
{ "daemon", LOG_DAEMON },
{ "ftp", LOG_FTP },
{ "kern", LOG_KERN },
{ "lpr", LOG_LPR },
{ "mail", LOG_MAIL },
{ "mark", INTERNAL_MARK }, /* INTERNAL */
{ "news", LOG_NEWS },
{ "security", LOG_AUTH }, /* DEPRECATED */
{ "syslog", LOG_SYSLOG },
{ "user", LOG_USER },
{ "uucp", LOG_UUCP },
{ "local0", LOG_LOCAL0 },
{ "local1", LOG_LOCAL1 },
{ "local2", LOG_LOCAL2 },
{ "local3", LOG_LOCAL3 },
{ "local4", LOG_LOCAL4 },
{ "local5", LOG_LOCAL5 },
{ "local6", LOG_LOCAL6 },
{ "local7", LOG_LOCAL7 },
{ NULL, -1 },
};
#endif
#ifdef _KERNEL
#define LOG_PRINTF -1 /* pseudo-priority to indicate use of printf */
#endif
/*
* arguments to setlogmask.
*/
#define LOG_MASK(pri) (1 << (pri)) /* mask for one priority */
#define LOG_UPTO(pri) ((1 << ((pri)+1)) - 1) /* all priorities through pri */
/*
* Option flags for openlog.
*
* LOG_ODELAY no longer does anything.
* LOG_NDELAY is the inverse of what it used to be.
*/
#define LOG_PID 0x01 /* log the pid with each message */
#define LOG_CONS 0x02 /* log on the console if errors in sending */
#define LOG_ODELAY 0x04 /* delay open until first syslog() (default) */
#define LOG_NDELAY 0x08 /* don't delay open */
#define LOG_NOWAIT 0x10 /* don't wait for console forks: DEPRECATED */
#define LOG_PERROR 0x20 /* log to stderr as well */
#ifndef _KERNEL
/*
* Don't use va_list in the vsyslog() prototype. Va_list is typedef'd in two
* places (<machine/varargs.h> and <machine/stdarg.h>), so if we include one
* of them here we may collide with the utility's includes. It's unreasonable
* for utilities to have to include one of them to include syslog.h, so we get
* _BSD_VA_LIST_ from <machine/ansi.h> and use it.
*/
#ifndef WIN32
#include <machine/ansi.h>
#include <sys/cdefs.h>
#endif
#ifdef WIN32
void AddEventSource(char *);
void syslog(int, char *, ...);
void vsyslog(int, char *, va_list);
void openlog(char *, int, int);
void closelog(void);
#else
__BEGIN_DECLS
void closelog __P((void));
void openlog __P((const char *, int, int));
int setlogmask __P((int));
void syslog __P((int, const char *, ...))
__attribute__((__format__(__printf__,2,3)));
void vsyslog __P((int, const char *, _BSD_VA_LIST_));
__END_DECLS
#endif
#else /* !_KERNEL */
void logpri __P((int));
void log __P((int, const char *, ...))
__kprintf_attribute__((__format__(__kprintf__,2,3)));
int addlog __P((const char *, ...))
__kprintf_attribute__((__format__(__kprintf__,1,2)));
void logwakeup __P((void));
#endif /* !_KERNEL */