Re: [libvirt] [PATCH v2 02/13] Import stripped down virtlockd code as basis of virtlogd

Copy the virtlockd codebase across to form the initial virlogd code. Simple search & replace of s/lock/log/ and gut the remote protocol & dispatcher. This gives us a daemon that starts up and listens for connections, but does nothing with them. Signed-off-by: Daniel P. Berrange <berrange(a)redhat.com&gt; ---

diff --git a/src/logging/log_daemon.c b/src/logging/log_daemon.c new file mode 100644 index 0000000..184076c --- /dev/null +++ b/src/logging/log_daemon.c @@ -0,0 +1,1177 @@ +/* + * log_daemon.c: log management daemon + * + * Copyright (C) 2006-2015 Red Hat, Inc.

+ +struct _virLogDaemon { + virMutex lock; + virNetDaemonPtr dmn; + virNetServerPtr srv; +}; + +virLogDaemonPtr logDaemon = NULL; + +static bool execRestart; + +enum { + VIR_LOG_DAEMON_ERR_NONE = 0, + VIR_LOG_DAEMON_ERR_PIDFILE, + VIR_LOG_DAEMON_ERR_RUNDIR, + VIR_LOG_DAEMON_ERR_INIT, + VIR_LOG_DAEMON_ERR_SIGNAL, + VIR_LOG_DAEMON_ERR_PRIVS, + VIR_LOG_DAEMON_ERR_NETWORK, + VIR_LOG_DAEMON_ERR_CONFIG, + VIR_LOG_DAEMON_ERR_HOOKS, + VIR_LOG_DAEMON_ERR_REEXEC, + + VIR_LOG_DAEMON_ERR_LAST +}; + +VIR_ENUM_DECL(virDaemonErr) +VIR_ENUM_IMPL(virDaemonErr, VIR_LOG_DAEMON_ERR_LAST, + "Initialization successful", + "Unable to obtain pidfile", + "Unable to create rundir", + "Unable to initialize libvirt",

+ "Unable to setup signal handlers", + "Unable to drop privileges", + "Unable to initialize network sockets", + "Unable to load configuration file", + "Unable to look for hook scripts", + "Unable to re-execute daemon"); +

+ + +static void +virLogDaemonErrorHandler(void *opaque ATTRIBUTE_UNUSED, + virErrorPtr err ATTRIBUTE_UNUSED) +{ + /* Don't do anything, since logging infrastructure already + * took care of reporting the error */ +} + + +/* + * Set up the logging environment + * By default if daemonized all errors go to the logfile libvirtd.log, + * but if verbose or error debugging is asked for then also output + * informational and debug messages. Default size if 64 kB.

+ */ +static int +virLogDaemonSetupLogging(virLogDaemonConfigPtr config, + bool privileged, + bool verbose, + bool godaemon) +{ + virLogReset(); + + /* + * Libvirtd's order of precedence is:

+ +static void +virLogDaemonUsage(const char *argv0, bool privileged) +{ + fprintf(stderr, + _("\n" + "Usage:\n" + " %s [options]\n" + "\n" + "Options:\n" + " -h | --help Display program help:\n" + " -v | --verbose Verbose messages.\n" + " -d | --daemon Run as a daemon & write PID file.\n" + " -t | --timeout <secs> Exit after timeout period.\n" + " -f | --config <file> Configuration file.\n" + " -V | --version Display version information.\n" + " -p | --pid-file <file> Change name of PID file.\n" + "\n" + "libvirt lock management daemon:\n"), argv0);

+#define MAX_LISTEN 5

+int main(int argc, char **argv) {

diff --git a/src/logging/log_daemon_config.c b/src/logging/log_daemon_config.c new file mode 100644 index 0000000..98d4c89 --- /dev/null +++ b/src/logging/log_daemon_config.c @@ -0,0 +1,203 @@

+/* Read the config file if it exists. + * Only used in the remote case, hence the name.

+ */ +int +virLogDaemonConfigLoadFile(virLogDaemonConfigPtr data, + const char *filename, + bool allow_missing) +{ + virConfPtr conf; + int ret; + + if (allow_missing && + access(filename, R_OK) == -1 && + errno == ENOENT) + return 0; + + conf = virConfReadFile(filename, 0); + if (!conf) + return -1; + + ret = virLogDaemonConfigLoadOptions(data, filename, conf); + virConfFree(conf); + return ret; +}

diff --git a/src/logging/log_protocol.x b/src/logging/log_protocol.x new file mode 100644 index 0000000..9b8fa41 --- /dev/null +++ b/src/logging/log_protocol.x @@ -0,0 +1,22 @@ +/* -*- c -*- + */ + +%#include "internal.h" + +typedef opaque virLogManagerProtocolUUID[VIR_UUID_BUFLEN]; + +/* Length of long, but not unbounded, strings. + * This is an arbitrary limit designed to stop the decoder from trying + * to allocate unbounded amounts of memory when fed with a bad message. + */ +const VIR_LOG_MANAGER_PROTOCOL_STRING_MAX = 65536;

diff --git a/src/logging/test_virtlogd.aug.in b/src/logging/test_virtlogd.aug.in new file mode 100644 index 0000000..cc659d2 --- /dev/null +++ b/src/logging/test_virtlogd.aug.in @@ -0,0 +1,12 @@ +module Test_virtlogd = + let conf = "log_level = 3 +log_filters=\"3:remote 4:event\" +log_outputs=\"3:syslog:libvirtd\"

+log_buffer_size = 64 +" + + test Virtlogd.lns get conf = + { "log_level" = "3" } + { "log_filters" = "3:remote 4:event" } + { "log_outputs" = "3:syslog:libvirtd" } + { "log_buffer_size" = "64" }

diff --git a/src/logging/virtlogd.conf b/src/logging/virtlogd.conf new file mode 100644 index 0000000..609f67a --- /dev/null +++ b/src/logging/virtlogd.conf @@ -0,0 +1,67 @@ +# Master virtlogd daemon configuration file +# + +################################################################# +# +# Logging controls +# + +# Logging level: 4 errors, 3 warnings, 2 information, 1 debug +# basically 1 will log everything possible +#log_level = 3 + +# Logging filters: +# A filter allows to select a different logging level for a given category +# of logs +# The format for a filter is one of: +# x:name +# x:+name +# where name is a string which is matched against source file name, +# e.g., "remote", "qemu", or "util/json", the optional "+" prefix +# tells libvirt to log stack trace for each message matching name, +# and x is the minimal level where matching messages should be logged: +# 1: DEBUG +# 2: INFO +# 3: WARNING +# 4: ERROR +# +# Multiple filter can be defined in a single @filters, they just need to be +# separated by spaces. +# +# e.g. to only get warning or errors from the remote layer and only errors +# from the event layer: +#log_filters="3:remote 4:event" + +# Logging outputs: +# An output is one of the places to save logging information +# The format for an output can be: +# x:stderr +# output goes to stderr +# x:syslog:name +# use syslog for the output and use the given name as the ident +# x:file:file_path +# output to a file, with the given filepath

+# In all case the x prefix is the minimal level, acting as a filter +# 1: DEBUG +# 2: INFO +# 3: WARNING +# 4: ERROR +# +# Multiple output can be defined, they just need to be separated by spaces. +# e.g. to log all warnings and errors to syslog under the virtlogd ident: +#log_outputs="3:syslog:virtlogd" +# + +# Log debug buffer size: +# +# This configuration option is no longer used, since the global +# log buffer functionality has been removed. Please configure +# suitable log_outputs/log_filters settings to obtain logs. +#log_buffer_size = 64a

+ +# The maximum number of concurrent client connections to allow +# over all sockets combined. +# Each running virtual machine will require one open connection +# to virtlogd. So 'max_clients' will affect how many VMs can +# be run on a host +#max_clients = 1024

diff --git a/src/logging/virtlogd.pod.in b/src/logging/virtlogd.pod.in new file mode 100644 index 0000000..bba7714 --- /dev/null +++ b/src/logging/virtlogd.pod.in @@ -0,0 +1,162 @@

+ +=head1 COPYRIGHT + +Copyright (C) 2006-2015 Red Hat, Inc., and the authors listed in the +libvirt AUTHORS file.