freebsd-skq/lib/libftpio/ftpio.3

.\" Copyright (c) 1996 Jordan Hubbard (jkh@FreeBSD.org)
.\" 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.
.\"
.\" THIS SOFTWARE IS PROVIDED BY JORDAN HUBBARD ``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 AUTHOR 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.
.\"
.\"
.Dd June 17, 1996
.Dt ftpio 3
.Os
.Sh NAME
.Nm ftpLogin ,
.Nm ftpChdir ,
.Nm ftpErrno ,
.Nm ftpGetModtime ,
.Nm ftpGetSize ,
.Nm ftpGet ,
.Nm ftpPut ,
.Nm ftpBinary ,
.Nm ftpPassive ,
.Nm ftpRestart ,
.Nm ftpGetURL ,
.Nm ftpPutURL ,
.Nd FTPIO User library
.Sh SYNOPSIS
.Fd #include <ftpio.h>
.Ft FILE *
.Fn ftpLogin "char *host, char *user, char *passwd, int ftp_port"
.Ft int
.Fn ftpChdir "FILE *fp, char *dirname"
.Ft int
.Fn ftpErrno "FILE *fp"
.Ft time_t
.Fn ftpGetModtime "FILE *fp, char *file"
.Ft size_t
.Fn ftpGetSize "FILE *fp, char *file"
.Ft FILE *
.Fn ftpGet "FILE *fp, char *file"
.Ft FILE *
.Fn ftpPut "FILE *fp, char *file"
.Ft int
.Fn ftpBinary "FILE *fp, int status"
.Ft int
.Fn ftpPassive "FILE *fp, int status"
.Ft int
.Fn ftpRestart "FILE *fp, int where"
.Ft FILE *
.Fn ftpGetURL "char *url, char *user, char *passwd"
.Ft FILE *
.Fn ftpPutURL "char *url, char *user, char *passwd"

.Sh DESCRIPTION
These functions implement a high-level library for managing FTP connections.
.Pp
.Fn ftpLogin
attempts to log in using the supplied
.Fa user ,
.Fa passwd
and
.Fa ftp_port
fields (if passed as 0,
.Fa ftp_port
defaults to the standard ftp port of 21).  If it is successful, a
standard
.Fa stream
descriptor is returned which should be passed to subsequent FTP
operations. On failure, NULL is returned and
.Fn ftpErrno
will return the error code returned by the foreign server.
.Pp
.Fn ftpChdir
attempts to issue a server CD command to the the directory named in
.Fa dir.
On success, zero is returned.  On failure, -1.
.Pp
.Fn ftpErrno
returns the server failure code for the last operation (useful for seeing
more about what happened if you're familiar with FTP error codes).
.Pp
.Fn ftpGet
attempts to retreive the file named by the
.Fa file
argument (which is assumed to be relative to the FTP server's current directory,
see
.Fn ftpChdir )
and returns a new
.Fa stream
pointer for the file or NULL on failure.
.Pp
.Fn ftpGetModtime
returns the last modification time of the file named by the
.Fa file
argument.  If the file could not be opened or stat'd, 0 is returned.
.Pp
.Fn ftpGetSize
returns the size in bytes of the file named by the
.Fa file
argument.  If the file could not be opened or stat'd, -1 is returned.
.Pp
.Fn ftpPut
attempts to create a new file named by the
.Fa file
argument (which is assumed to be relative to the FTP server's current directory,
see
.Fn ftpChdir )
and returns a new
.Fa stream
pointer for the file or NULL on failure.
.Pp
.Fn ftpBinary
sets binary mode for the current server connection named by
.Fa stream
to boolean value
.Fa status .
.Pp
.Fn ftpPassive
sets passive mode (for firewalls) for the current server connection named by
.Fa stream
to boolean value
.Fa status .
.Pp
.Fn ftpRestart
requests that if the remote server supports restart operations, the offset
in bytes specified in
.Fa where
should be used in the next file get operation to resume transferring from
that location.  This is handy for restarting long get operations which have
aborted in the middle without re-transferring wasted bytes.  Returns the
old seek value, if any.
.Pp
.Fn ftpGetURL
attempts to retreive the file named by the supplied
.Fa URL
and can be considered equivalent to the combined
.Fn ftpLogin ,
.Fn ftpChdir
and
.Fn ftpGet
operations except that no server
.Fa stream
is ever returned - the connection to the server closes when
the file has been completely read.  Use the lower-level routines
if multiple gets are required as it will be far more efficient.
.Pp
.Fn ftpPutURL
attempts to create the file named by the supplied
.Fa URL
and can be considered equivalent to the combined
.Fn ftpLogin ,
.Fn ftpChdir
and
.Fn ftpPut
operations except that no server
.Fa stream
is ever returned - the connection to the server closes when
the file has been completely written.  Use the lower-level routines
if multiple puts are required as it will be far more efficient.
.Sh BUGS
I'm sure you can get this thing's internal state machine confused if
you really work at it, but so far it's proven itself pretty robust in
all my tests.
.Sh HISTORY
Started life as Poul-Henning Kamp's ftp driver for the system installation
utility, later significantly mutated into a more general form as an
extension of stdio and given a TCL interface (not enabled by default)
by Jordan Hubbard.  Also incorporates some ideas and extensions from
Jean-Marc Zucconi.
.Sh AUTHORS
Jordan Hubbard, Poul-Henning Kamp and Jean-Marc Zucconi