mod_disk_log - Standard logging using the "Common Logfile Format" and disk_log(3).

This module uses disk_log(3) to make it possible to log all incoming requests to an access log file. The de-facto standard Common Logfile Format is used for this purpose. There are numerous statistic programs available to analyze Common Logfile Format log files. The Common Logfile Format looks as follows:

remotehost rfc931 authuser [date] "request" status bytes

remotehost: Remote hostname (or IP number if the DNS hostname is not available).

rfc931: The client's remote username (RFC 931).

authuser: The username with which the user has authenticated himself.

[date]: Date and time of the request (RFC 1123).

"request": The request line exactly as it came from the client (RFC 1945).

status: The HTTP status code returned to the client (RFC 1945).

bytes: The content-length of the document transferred.

This module furthermore uses disk_log(3) to support the use of an error log file to record internal server errors. The error log format is more ad hoc than Common Logfile Format, but conforms to the following syntax:

[date] access to path failed for remotehost, reason: reason

Syntax: DiskLogFormat internal|external

Default: - external -

Module: mod_disk_log(3)

DiskLogFormat defines the file-format of the log files see disk_log for more information. If the internal file-format is used, the logfile will be repaired after a crash. When a log file is repaired data might get lost. When the external file-format is used httpd will not start if the log file is broken.

      DiskLogFormat external

Syntax: ErrorDiskLog filename

Default: - None -

Module: mod_disk_log(3)

ErrorDiskLog defines the filename of the (disk_log(3)) error log file to be used to log server errors. If the filename does not begin with a slash (/) it is assumed to be relative to the ServerRoot, for example:

ErrorDiskLog logs/error_disk_log_8080

and errors will be logged in the server root($SERVER_ROOT/logs/error_disk_log_8080) space.

Syntax: ErrorDiskLogSize max-bytes max-files

Default: ErrorDiskLogSize 512000 8

Module: mod_disk_log(3)

ErrorDiskLogSize defines the properties of the (disk_log(3)) error log file. The disk_log(3) error log file is of type wrap log and max-bytes will be written to each file and max-files will be used before the first file is truncated and reused.

Syntax: SecurityDiskLog filename

Default: - None -

Module: mod_disk_log(3)

SecurityDiskLog defines the filename of the (disk_log(3)) access log file which logs incoming security events i.e authenticated requests. If the filename does not begin with a slash (/) it is assumed to be relative to the ServerRoot, see TransferDiskLog for more information.

Syntax: SecurityDiskLogSize max-bytes max-files

Default: SecurityDiskLogSize 512000 8

Module: mod_disk_log(3)

SecurityDiskLogSize defines the properties of the disk_log(3) access log file. The disk_log(3) access log file is of type wrap log and max-bytes will be written to each file and max-files will be used before the first file is truncated and reused.

Syntax: TransferDiskLog filename

Default: - None -

Module: mod_disk_log(3)

TransferDiskLog defines the filename of the (disk_log(3)) access log file which logs incoming requests. If the filename does not begin with a slash (/) it is assumed to be relative to the ServerRoot, for example:

TransferDiskLog logs/transfer_disk_log_8080

and errors will be logged in the server root($SERVER_ROOT/logs/transfer_disk_log_8080) space.

Syntax: TransferDiskLogSize max-bytes max-files

Default: TransferDiskLogSize 512000 8

Module: mod_disk_log(3)

TransferDiskLogSize defines the properties of the disk_log(3) access log file. The disk_log(3) access log file is of type wrap log and max-bytes will be written to each file and max-files will be used before the first file is truncated and reused.

Uses the following EWSAPI interaction data, if available:

{remote_user, RemoteUser}: as defined in mod_auth(3).

This module furthermore exports a batch of functions to be used by other EWSAPI modules:

error_log(Socket,SocketType,ConfigDB,Date,Reason) -> ok | no_error_log

Types

Socket = socket()

SocketType = ip_comm | ssl

ConfigDB = config_db()

Date = Reason = string()

error_log/5 uses disk_log(3) to log an error in the error log file. Socket is a handler to a socket of type SocketType and config_db() is the server config file in ETS table format as described in httpd(3). Date is a RFC 1123 date string as generated by httpd_util:rfc1123_date/0.

security_log(User,Event) -> ok | no_security_log

Types

User = String()

Event = String

security_log/2 uses disk_log(3) to log a security event in the security log file. User is the users name.

httpd(3), mod_auth(3), mod_security(3), mod_log(3)

Joakim Grebenö  - support@erlang.ericsson.se