NAME

hfaxd - HylaFAX client-server protocol server  

SYNOPSIS

/usr/sbin/hfaxd [ -d ] [ -D secs ] [ -q dir ] [ .B -c config ] [ -o port ] [ -O ] [ -f bindaddressfamily ] [ -l bindaddress ] [ -p pasv_min_port:pasv_max_port ] [ -i port ] [ -I ] [ -s port ] [ -S ]  

DESCRIPTION

hfaxd is the HylaFAX program that implements the server portion of:
the client-server protocol and
the Simple Network Paging Protocol (SNPP) used to submit message pager jobs to the IXO/TAP and UCP support.

Additional client-server protocols are planned and hfaxd is intended to be the ``carrier'' through which they are supported.

hfaxd is typically used in one of two ways; either as a stand-alone process that is started at system boot time to listen for client connections on one or more ports (in which case the -i, -o, or -s option must be used), or as a subservient process to the inetd(8C) program. The two forms of use may however be combined so long as the same service is not provided both by the stand-alone hfaxd and through inetd.  

HYLAFAX CLIENT-SERVER PROTOCOL SUPPORT

If hfaxd is started with the -i option it will service clients using the HylaFAX client-server protocol. This protocol is strongly related to the Internet File Transfer Protocol (FTP); so much so in fact that FTP client programs that include support for ``quoted commands'' may be used to communicate with hfaxd using the new protocol. (It should also be possible to use FTP-aware World Wide Web browsers such as Mosaic and Netscape Navigator to access HylaFAX servers through the new protocol; but the current format for information returned in directory listings confuses them.)

The hfaxd server currently recognizes the following protocol requests; case is not distinguished. Entries marked with a ¹ can be used only when the client has established administrative privileges with ADMIN.


Request          Description
ABOR             abort previous command
ACCT             specify account (ignored)
ADMIN            specify password for administrative privileges
ALLO             allocate storage (vacuously)
ANSWER¹         request that call be answered
APPE             append to a file
CDUP             change to parent of current working directory
CHMOD            change mode of a file
CHOWN¹          change owner of a file
CWD              change working directory
DELE             delete a file
DISABLE¹        disable outbound use of modem
ENABLE¹         enable outbound use of modem
HELP             give help information
FILEFMT          specify/query format for returning file status
FORM             specify data transfer format
IDLE             set idle-timer (in seconds)
JDELE            delete done or suspended job
JINTR            interrupt job
JKILL            kill job
JNEW             create new job
JOB              set/query current job
JOBFMT           specify/query format for returning job status
JPARM            specify/query job state parameter
JREST            reset current job state
JSUBM            submit job to scheduler
JSUSP            suspend job from scheduling
JWAIT            wait for job to complete
JGDELE           delete group of jobs
JGKILL           kill group of jobs
JGINTR           interrupt group of jobs
JGNEW            place current job in a new job group
JGPARM           set state parameter in a group of jobs
JGREST           reset current state for a group of jobs
JGRP             set/query current job group
JGSUBM           submit group of jobs to scheduler
JGSUSP           suspend group of jobs from scheduling
JGWAIT           wait for group of jobs to complete
LIST             list files in a directory
MDTM             show last modification time of file
MODE             specify data transfer mode
MDMFMT           specify/query format for returning modem status
NLST             give name list of files in directory 
NOOP             do nothing
PASS             specify password
PASV             prepare for server-to-server transfer
PORT             specify data connection port
PWD              print the current working directory
QUIT             terminate session
RCVFMT           specify/query format for returning received facsimile status
REIN             reinitiate server state
REST             restart incomplete transfer
RETP             retrieve the next page in a file
RETR             retrieve a file
SHUT             schedule server shutdown
SITE             non-standard commands (see next section)
SIZE             return size of file
STAT             return status of server or file
STOR             store a file
STOT             store a temporary file with a unique name
STOU             store a file with a unique name
STRU             specify data transfer structure
SYST             show operating system type of server system
TYPE             specify data transfer type
TZONE            specify timezone handling for dates and times
USER             specify user name
VRFY             verify dialstring handling and/or least-cost routing

The following non-standard or experimental commands are supported through the SITE request.


Request           Description
ADDMODEM¹        add/configure new modem for use
ADDUSER¹         add client access control entry
CONFIG¹          send configuration parameter setting to server
DELMODEM¹        deconfigure/remove modem
DELUSER¹         remove client access control entry
TRIGGER           register real-time event trigger
HELP              give help information, e.g., SITE HELP

In addition FTP requests that are specified in Internet RFC 959 but not listed here are recognized, but not implemented.

The hfaxd server will abort an active data transfer only when the ABOR command is preceded by a Telnet "Interrupt Process" (IP) signal and a Telnet "Synch" signal in the command Telnet stream, as described in Internet RFC 959. If a STAT command is received during a data transfer, preceded by a Telnet IP and Synch, transfer status will be returned.  

SIMPLE NETWORK PAGING PROTOCOL (SNPP) SUPPORT

If hfaxd is started with the -s option it will service clients using the Simple Network Pager Protocol (SNPP) as specified in RFC 1861 (which obsoletes RFC 1645).

The hfaxd server currently recognizes the SNPP protocol requests listed below. Requests marked with a ¹ are non-standard extensions to RFC 1861 that may be added to SNPP at some future time. Case is not distinguished and only the first four characters of requests are used in identifying commands.


Request       Description
2WAY          preface a 2-way transaction
ABOR¹        abort previous command
ACKR          set read acknowledgement handling for subsequent requests
ALER          set the alter-level for subsequent requests
CALL          set the caller-ID for subsequent requests
COVE          set the alternate coverage area for subsequent requests
DATA          specify a multi-line message
EXPT          set the expiration time for subsequent requests
HELP          give help information
HOLD          set the time at which subsequent requests are to be delivered
KTAG          kill a previously submitted request
LEVE          set the service level for subsequent requests
LOGI          login to server
MCRE          specify multiple response text and code
MESS          specify a single-line message
MSTA          return the status of a previously submitted request
NOQU          disable message queueing
PAGE          specify the destination pager
PING          locate/validate a pager
QUIT          terminate session
RESE          reset server state
RTYP          set the reply type code for subsequent requests
SEND          send message(s)
SITE¹        site-specific commands (see next section)
STAT¹        return server status
SUBJ          set the message text for subsequent requests

The hfaxd server will abort an active SEND operation when an ABOR command is preceded by a Telnet "Interrupt Process" (IP) signal and a Telnet "Synch" signal in the command Telnet stream.

The following non-standard or experimental commands are also supported through the SITE request.


Request        Description
FROMUSER       specify the sender's identity
IDLE           set idle-timer (in seconds)
JPARM          query job parameter status
JQUEUE         control whether or not job is queued
LASTTIME       set the time to terminate an unfinished job
MAILADDR       set the e-mail address to use for notification
MAXDIALS       set the maximum number of times to dial the phone
MAXTRIES       set the maximum number of times to try sending the page
MODEM          set the modem or class of modems to use
NOTIFY         set the e-mail notification
RETRYTIME      set the time to delay between job retries
SCHEDPRI       set the scheduling priority for the job
HELP           give help information, e.g., SITE HELP

Note that hfaxd requires that SNPP clients login first with the LOGI directive while RFC 1861 permits clients to submit pages anonymously.  

CLIENT ACCESS CONTROL

hfaxd controls client access according to the information in the file /var/spool/hylafax/etc/hosts.hfaxd. This file defines the set of users and machines that may receive service and, optionally, defines password challenges to use in authenticating clients. Clients may be permitted access to services with or without a password challenge. Access may also be restricted based on the host machine that a request for service originates from. Consult hosts.hfaxd(5F) for information on the format and content of this file. The SITE ADDUSER protocol request is provided for adding new users to a server (available only to clients with administrative privileges).

Server resources are controlled based on clients' identities. Jobs and documents, both received and submitted, are protected by the server. Typically clients are permitted access to anything they own or that is publicly accessible. There are also administrative privileges that clients may acquire and which permit them wide access to objects that reside on the server.

A complete client-server protocol specification is still outstanding.

hfaxd operates with its root directory set to the top of the HylaFAX spooling area; /var/spool/hylafax. This is done so that clients see a virtual file hierarchy that is completely contained within the HylaFAX operating environment on the server machine. Administrators however must be aware of this action when specifying files in the hfaxd configuration file: absolute pathnames relative to the root of the spooling should be used to specify filenames.  

SERVER ACCESS CONTROL

The file /var/spool/hylafax/etc/shutdown, when present, specifies when to restrict access to a server machine. When this file is present and contains valid information hfaxd will permit only users with administrative privileges to access the server. Any other users that request service will be denied access and negative server responses will include any shutdown message specified in the shutdown file. Consult hylafax-shutdown(5F) for information on the format and content of this file.

The SHUT protocol request can be used to schedule a server shutdown; it is available only to clients with administrative privileges. To make a shutdown server available again the shutdown file can be deleted with the DELE protocol request (this is to be replaced with an ``unshut'' protocol request so that implementation details are not part of the protocol).  

CONFIGURATION FILES

hfaxd reads configuration information from the file /etc/hylafax/hfaxd.conf each time a new server process is started (i.e. for each new client). This file uses the same conventions used by other HylaFAX configuration files; as described in hylafax-config(5F). The following configuration parameters are recognized; items marked ``(SNPP)'' are used only by the SNPP support.


Tag                      Type       Default                               Description
FaxContact               string     see below                             contact address to show in help text
FileFmt                  string     see below                             format string for file status results
IdleTimeout              integer    900                                   client idle timeout in seconds
JobFmt                   string     see below                             format string for job status results
JobHostID                string                                           identification information for job hosts
JobProtection            octal      0644                                  permissions for job qfiles in sendq/doneq
KillTimeMap              string     see below                             mapping from service level to job kill time (SNPP)
LDAPServerURI            string                                           URI of the ldap server including port number
LDAPBaseDN               string                                           LDAP context where user objects can be found
LDAPReqGroup             string                                           LDAP context of the users group
LDAPVersion              integer    3                                     LDAP protocol version to use
LogFacility              string     daemon                                syslog facility name for tracing messages
MaxAdminAttempts         integer    5                                     maximum admin attempts before disconnecting
MaxConsecutiveBadCmds    integer    10                                    maximum invalid commands before disconnecting
MaxIdleTimeout           integer    7200                                  maximum client idle timeout permitted
MaxLoginAttempts         integer    5                                     maximum login attempts before disconnecting
MaxMsgLength             integer    128                                   maximum pager message length (SNPP)
ModemFmt                 string     see below                             format string for modem status results
PagerIDMapFile           string     /var/spool/hylafax/etc/pagermap       name of file for mapping pager IDs (SNPP)
PriorityMap              string     see below                             mapping from service level to job priority (SNPP)
RcvFmt                   string     see below                             format string for received facsimile status results
RecvqProtection          octal      0444                                  permissions for client access to recvq
RetryTimeMap             string     see below                             mapping from service level to job retry time (SNPP)
ServerTracing            integer    1                                     server tracing control vector
ShutdownFile             string     /var/spool/hylafax/etc/shutdown       name of shutdown control file
UserAccessFile           string     /var/spool/hylafax/etc/hosts.hfaxd    name of access control file
XferLogFile              string     /var/spool/hylafax/etc/clientlog      name of file for logging client data transfers

The configuration parameters are explained below:

FaxContact
The e-mail address to display as a point of contact in the help text returned to a client in response to the HELP or SITE HELP commands. By default this is ``FaxMaster@hostname'', where hostname is the fully qualified name for the machine where the server is running.
FileFmt
The format string to use when returning file status information with the LIST and STAT commands. Formats are specified using printf(3S) style conventions but using the field identifiers listed below. Each item can include field width, precision, left-justification, 0-filling, etc. just as for printf; e.g. %-8p for an 8-character wide, left-justified, blank-padded field containing the file protection flags.

Format    Description
a         Last access time
c         Creation time
d         Device number (octal)
f         Filename
g         Group identifier (decimal)
i         Inode number (decimal)
l         Link count (decimal)
m         Last modification time
o         Owner (based on file GID)
p         Fax-style protection flags (no group bits)
q         UNIX-style protection flags
r         Root device number (octal)
s         File size in bytes (decimal)
u         User identifier (decimal)
The default format string is ``%-7p %3l %8o %8s %-12.12m %.48f''. It is recommended that all items include a field width so that client applications that construct headers from the format string can constrain the width of column title strings.
IdleTimeout
The initial/default timeout to use in timing out idle clients. This value defines the maximum amount of time (in seconds) that hfaxd will wait for a command from a client before terminating the connection. Unprivileged clients may alter the idle timeout up to the value of MaxIdleTimeout; privileged clients may set the timeout to any value.
JobFmt
The format string to use when returning job status information for jobs in the sendq and doneq directories. Formats are specified using printf(3S) style conventions but using the field identifiers listed below. Each item can include field width, precision, left-justification, 0-filling, etc. just as for printf; e.g. %-3j for a 3-character wide, left-justified, blank-padded field containing the job state.

Format    Description
A         Destination SubAddress
B         Destination Password
C         Destination company name
D         Total # dials/maximum # dials
E         Desired signalling rate
F         Client-specific tagline format string
G         Desired min-scanline time
H         Desired data format
I         Client-specified scheduling priority
J         Client-specified job tag string
K         Desired use of ECM
L         Destination geographic location
M         Notification e-mail address
N         Desired use of private tagline (one-character symbol)
O         Whether to use continuation cover page (one-character symbol)
P         # pages transmitted/total # pages to transmit
Q         Client-specified minimum acceptable signalling rate
R         Destination person (receiver)
S         Sender's identity
T         Total # tries/maximum # tries
U         Page chopping threshold (inches)
V         Job done operation
W         Communication identifier
X         Job type (one-character symbol)
Y         Scheduled date and time
Z         Scheduled time in seconds since the UNIX epoch
a         Job state (one-character symbol)
b         # consecutive failed tries
c         Client machine name
d         Total # dials
e         Public (external) format of dialstring
f         # consecutive failed dials
g         Group identifier
h         Page chop handling (one-character symbol)
i         Current scheduling priority
j         Job identifier
k         Job kill time
l         Page length in mm
m         Assigned modem
n         E-mail notification handling (one-character symbol)
o         Job owner
p         # pages transmitted
q         Job retry time (MM::SS)
r         Document resolution in lines/inch
s         Job status information from last failure
t         Total # tries attempted
u         Maximum # tries
v         Client-specified dialstring
w         Page width in mm
x         Maximum # dials
y         Total # pages to transmit
z         Time to send job
The default format string is ``%-4j %3i %1a %6.6o %-12.12e %5P %5D %7z %.25s''. This string constrains each status line to be less than 80 characters. It is recommended that all items include a field width so that client applications, such as faxstat(1) that construct headers from the format string can constrain the width of column title strings.
JobHostID
A formatted string of the format ``<id>[:<host>[:<username>:<password>:<adminwd>]]'' that identifies a job host. Multiple instances of JobHostID are used in the configuration file to identify multiple job hosts. ``<id>'' is a numeric identification for the host which is prepended onto job ids created by that host. This is used by a client to distinguish between jobs created on different hosts when it may not initially know to which server it connected. ``<id>'' must be the same number of digits for all configured job hosts. For compatibility with all clients ``<id>'' must be numeric only. If the instance of JobHostID only includes ``<id>'' then it is understood to refer to the local host and not a remote host. It is this configuration entry that causes the prepending of the ``<id>'' number onto the job ids. The other values for the formatted string refer to connection details for user-level and admin-level login at the identified remote host. If only ``<host>'' is provided then the current user's login credentials are used for the chained connection. This configuration will cause hfaxd to connect as a client to the specified remote host for the requested action when the job id provided by its client refers to that remote host (the provided job id matches the ``<id>'' value in the host's JobHostID configuration). To do this the hfaxd client connection to the remote host requires administrative privileges or synchonized user accounts on both hosts. Be aware that when providing ``<username>'', ``<password>'', and especially ``<adminwd>'' in the configuration that this may compromise job security on the remote host since users from this host will be connecting to the remote host as a different user (and possibly with administrative privileges). As a null value for ``<adminwd>'' is permissible, administrative privileges may be omitted by using ``*'' for ``<adminwd>''. Because of the chroot under which the client instance of hfaxd operates it will be necessary to copy numerous system files to the HylaFAX spool directory structure so that the chained client connection can be made to the remote job host. This copy should be repeated after any upgrades or changes to the system files. To identify which files must be copied one may examine strace output for faxstat and look for which files it opens in the operation.
JobProtection
The default setting of ``0644'' allows all users to view all job parameters in the send and done queues. The mode determines the permissions of the clients to see the jobs, following the HylaFAX permission model of the group bits controlling uid permissions and the other bits controlling other permissions. A setting of ``0640'' allows only the job owner and the administrator to view jobs. If a user doesn't have permissions on the job, the job will not be visible to them when viewing the queues.
KillTimeMap
The mapping from SNPP service level (0-11) to job expiration time (kill time). A mapping is specified as a string of space-separate numbers where each value is the number of minutes to permit a job to run. The default mapping is ``5 5 5 15 60 240 720 1440 1440 1440 1440 1440'' which expires a job in 5 minutes for service levels 0-2, 15 minutes for level three, 60 minutes for level four, etc.
LDAPServerURI
The full address of the ldap server including port number, i.e.: ldaps://1.2.3.4:636 (for secure connections) or ldap://1.2.3.4:389 (for insecure connections)
LDAPBaseDN
The full LDAP context where user objects can be found, i.e.: ou=users,dc=example,dc=com for Active Directory/LDAP or ou=users,o=organization for Novell eDirectory
LDAPReqGroup
The full LDAP context of the group users have to be a member of to gain HylaFAX access for sending faxes
LDAPVersion
Version number of the LDAP Protocol to use (default is '3')
LogFacility
The symbolic name for the syslog(3) facility to use when logging error messages and informational/debugging messages requested through the ServerTracing parameter. The list of facility names is found in the system include file <syslog.h>; comparisons are case-insensitive.
MaxAdminAttempts
The maximum number of unsuccessful attempts gain administrative privileges with the ADMIN command that hfaxd will permit a client before terminating the connection. Note that the count of attempts is reset if/when the client successfully gains administrative privileges.
MaxConsecutiveBadCmds
The maximum number of consecutive unrecognized, unimplemented, syntactically incorrect, or otherwise unacceptable commands to permit a client before terminating the connection. This control has two purposes: to handle naive or malicious clients from sending long streams of nonsense commands to a server, and to ensure that clients are forcibly terminated when a server is marked shutdown.
MaxIdleTimeout
The maximum value that a client may set the idle timeout to. This value is not enforced if the client has administrative privileges.
MaxLoginAttempts
The maximum number of unsuccessful attempts to login with the USER and PASS commands that hfaxd will permit a client before terminating the connection.
MaxMsgLength
The maximum number of characters to accept in a pager message specified with the DATA or MESS commands. Messages longer than this value are rejected.
ModemFmt
The format string to use when returning modem status information for modems listed in the status directory. Formats are specified using printf(3S) style conventions but using the field identifiers listed below. Each item can include field width, precision, left-justification, 0-filling, etc. just as for printf; e.g. %-8h for an 8-character wide, left-justified, blank-padded field containing the name of the host the server is running on.

Format    Description
h         Server hostname
l         Local identifier string
m         Canonical modem name
n         FAX phone number
r         Maximum pages that can be received in a single call
s         Status information string
t         Server and session tracing levels (xxxxx:yyyyy)
v         Modem speaker volume as one-character symbol
z         A ``*'' if a faxgetty(8C) process is running; otherwise `` '' (space)
The default format string is ``Modem %m (%n): %s''.
PagerIDMapFile
The absolute pathname of the file that contains directions for mapping pager identifiers to IXO/TAP or UCP service providers (and optionally a pager identification number). Consult pagermap(5F) for information on the format and content of this file. (Note that absolute pathnames are relative to the root of the spooling area).
PriorityMap
The mapping from SNPP service level (0-11) to job scheduling priority. A mapping is specified as a string of space-separate numbers where each value is the priority to assign to a job. The default mapping is ``63 127 127 127 127 127 127 127 127 127 127 127'' which assigns a high priority to service level zero and normal (default) priority to all other service levels.
RcvFmt
The format string to use when returning status information for received facsimile in the recvq directory. Formats are specified using printf(3S) style conventions but using the field identifiers listed below. Each item can include field width, precision, left-justification, 0-filling, etc. just as for printf; e.g. %-3b for a 3-character wide, left-justified, blank-padded field containing the signalling rate.

Format    Description
X         Reception indicator (1=yes, 0=no)
Y         Received date and time
Z         Received time in seconds since the UNIX epoch
a         SubAddress received from sender (if any)
b         Signalling rate used during receive
d         Data format used during receive
e         Error description if an error occurred during receive
f         Document filename (relative to the recvq directory)
h         Time spent receiving document (HH:MM:SS)
l         Page length in mm
m         Fax-style protection mode string (``-rwxrwx'')
n         File size (number of bytes)
o         File owner
p         Number of pages in document
q         UNIX-style protection flags
r         Resolution of received data
s         Sender identity (TSI)
t         Compact representation of the time when the receive happened
w         Page width in mm
z         A ``*'' if receive is going on; otherwise `` '' (space)
The default format string is ``%-7m %4p%1z %-8.8o %14.14s %7t %f''. This string constrains each status line to be less than 80 characters. It is recommended that all items include a field width so that client applications, such as faxstat(1) that construct headers from the format string can constrain the width of column title strings.
RecvqProtection
The permissions setting for administrator, owners, and users for viewing files in the HylaFAX receive queue. The default setting of ``0444'' allows all users to view all files in the queues. A setting of ``0440'' allows only the job owner and the administrator to view files. A setting of ``0040'' allows only the administrator to view the files. If a user doesn't have permissions on the file, the file will not be visible to them when viewing the queue.
RetryTimeMap
The mapping from SNPP service level (0-11) to job retry time. A mapping is specified as a string of space-separate numbers where each value is the number of seconds to delay between delivery attempts. A value of zero causes retries to be scheduled using the default algorithm used by the HylaFAX job scheduler. The default mapping is ``30 60 60 180 0 0 0 0 0 0 0 0'' which retries a level 0 job after a 30 second delay, levels 1 and 2 after 60 seconds, level 3 after 3 minutes, and other jobs are retried according to the usual scheduling algorithm.
ServerTracing
A number that controls the generation of tracing information by a server. areas that are individually controlled. To enable tracing of multiple areas of operation, the flag associated with each area should be bit-or'd to form the value for this tag.

Flag               Description
1 (0x00001)        General server operation
2 (0x00002)        Client-server protocol requests and responses
4 (0x00004)        File transfers from client to server
8 (0x00008)        File transfers from server to client
16 (0x00010)       Client logins
32 (0x00020)       All network connections
64 (0x00040)       FIFO messages to and from faxq(8C)
128 (0x00080)      TIFF Library errors and warnings
256 (0x00100)      Configuration file processing

Tracing messages are directed to syslog(3) using the facility specified with the LogFacility configuration parameter. Note that syslogd(8C) must be configured to capture facility.info, facility.debug, facility.warning, and facility.err messages.
ShutdownFile
The absolute pathname of the server shutdown file; see hylafax-shutdown(5F) for information on the format and content of this file. (Note that absolute pathnames are relative to the root of the spooling area).
UserAccessFile
The absolute pathname of the user access control file; see hosts.hfaxd(5F) for information on the format and content of this file. (Note that absolute pathnames are relative to the root of the spooling area).
XferLogFile
The absolute pathname of the file to use for logging client-server file transfers (when enabled through the ServerTracing parameter). (Note that absolute pathnames are relative to the root of the spooling area).
 

OPTIONS

-q dir
The specified directory is treated as the spooling area. The default spooling area, /var/spool/hylafax, is defined at the time the software is built.
-d
Stop hfaxd from detaching itself from the controlling terminal. This option is normally used only when running hfaxd under a debugger or when hfaxd is started up from the inetd(8C) process.
-D secs
Sleep for the specified number of seconds before actually processing the client to allow a debugger to attach.
-f bindaddressfamily
Bind to the specified bindaddressfamily tcp port. Options are ``IPv4'', ``IPv6'', or ``all''. Please note that this argument needs to be specified before -i otherwise it will be ignored.
-l bindaddress
Bind to the specified bindaddress tcp port. Please note that this argument needs to be specified before -i otherwise it will be ignored. A better approach to improve security would be to run hfaxd from xinetd, binding its service to the specific port. This will also make hylafax benefits from tcp wrappers and other options provided by xinetd.
-p port:port
Restrict the range of TCP ports used when binding the socket for PASV/EPSV mode data transfers. Without this option, bind will be called with a port of 0, allowing the kernel to allocate an ephemeral port. To be useful, -p MUST be specified BEFORE -i due to the way command line arguments are parsed.
-i port
Listen on the specified port for service requests and respond with the client-server protocol. The port may be specified either symbolically, e.g. ``hylafax'' or numerically. This flag may be specified multiple times to request service on multiple different ports.
-s port
Listen on the specified port for service requests and respond with the Simple Network Paging (SNPP) protocol. The port may be specified either symbolically, e.g. ``snpp'' or numerically. This flag may be specified multiple times to request service on multiple different ports.
-I
Service the client-server protocol using the standard input and output. This option is useful when hfaxd is started up by inetd(8C).
-S
Service the Simple Network Paging (SNPP) protocol using the standard input and output. This option is useful when hfaxd is started up by inetd(8C).
 

DIAGNOSTICS

Diagnostics generated by hfaxd are logged using syslog(3).
-c config
Treat config as a configuration parameter specification that is interpreted after reading the configuration file. For example, ``-c servertracing:0x4f'' would set the ServerTracing configuration parameter to ``0x4f'', overriding any setting in the configuration file.
 

FILES

/etc/hylafax/hfaxd.conf               server configuration file
/var/spool/hylafax                    spooling area
/var/spool/hylafax/FIFO               for submitting the job
/var/spool/hylafax/sendq              where job description is placed
/var/spool/hylafax/sendq/seqf         for assigning job identifiers
/var/spool/hylafax/sendq/seqf.incrementincrement value for sendq seqf
/var/spool/hylafax/docq/seqf          for assigning document identifiers
/var/spool/hylafax/docq/seqf.incrementincrement value for docq seqf
/var/spool/hylafax/tmp                temporary location of job-related files
/var/spool/hylafax/docq               where document files are placed
/var/spool/hylafax/recvq              where received facsimile are found
/var/spool/hylafax/archive            where archived jobs are placed
/var/spool/hylafax/log                for server log files
/var/spool/hylafax/client             for FIFO files used in communicating with faxq
/var/spool/hylafax/status             for server status information
/var/spool/hylafax/config.device      for returning server status
/var/spool/hylafax/etc/hosts.hfaxd    host access control list
/var/spool/hylafax/etc/shutdown       server shutdown control
/var/spool/hylafax/etc/pagermap       SNPP pager ID mapping file
 

BUGS

To be filled in.  

SEE ALSO

sendfax(1), sendpage(1), faxalter(1), faxrm(1), faxstat(1), faxq(8C), syslog(3) hylafax-server(5F), hosts.hfaxd(5F), status(5F), hylafax-shutdown(5F),