#include <net/libftp.h>#define BINARY 1 #define ASCII 2
typedef struct { long size_bytes; /* total bytes transferred */ float seconds; /* time taken to transfer */ float kbs; /* kilobytes per second */ } SPEED;
typedef struct { FILE *filedes; /* data file descriptor */ char transf_type; /* type of transfer - user settable */ char *ftp_msg; /* error status of function or reply string from server */ int transf_calc; /* flag to turn on xfer rate calc - user settable */ SPEED speed; /* xfer rate information */ int sockfd; /* CNTRL connection socket id */ int datasd; /* DATA connection socket id */ int reply; /* return value of function or reply code from server */ int debug; /* flag to turn on debugging - user settable */ int linger; /* flag to turn on socket linger opt - user settable */ int connected; /* flag to indicate the existence of a control connection for the session under question */ struct servent *ftp_sp; /* specific service entry */ } FTPINFO;
int ftp_accnt(ftpinfo, account) FTPINFO *ftpinfo; const char *account;
int ftp_appfile(ftpinfo, rempath, localpath) FTPINFO *ftpinfo; const char *rempath; const char *localpath;
int ftp_ascii(ftpinfo) FTPINFO *ftpinfo;
int ftp_binary(ftpinfo) FTPINFO *ftpinfo;
int ftp_bye(ftpinfo) FTPINFO *ftpinfo;
int ftp_chdir(ftpinfo, rempath) FTPINFO *ftpinfo; const char *rempath;
int ftp_command(ftpinfo, optinfo, action) FTPINFO *ftpinfo; const char *optinfo; const char *action;
int ftp_dataconn(ftpinfo, file, action, mode) FTPINFO *ftpinfo; const char *file const char *action; const char *mode;
int ftp_del(ftpinfo, file) FTPINFO *ftpinfo; const char *file;
int ftp_dir(ftpinfo, rempath, localpath) FTPINFO *ftpinfo; const char *rempath; const char *localpath;
int ftp_ebcdic(ftpinfo) FTPINFO *ftpinfo;
int ftp_getfile(ftpinfo, rempath, localpath) FTPINFO *ftpinfo; const char *rempath; const char *localpath;
int ftp_idle(ftpinfo, idle_time) FTPINFO *ftpinfo; const char *idle_time;
int ftp_initconn(ftpinfo) FTPINFO *ftpinfo;
int ftp_login(ftpinfo, remhost, user, passwd, account) FTPINFO *ftpinfo; const char *remhost; const char *user; const char *passwd; const char *account;
int ftp_mkdir(ftpinfo, remdir) FTPINFO *ftpinfo; const char *remdir;
int ftp_passwd(ftpinfo, password) FTPINFO *ftpinfo; const char *password;
int ftp_prconnect(ftpinfo, remhost) FTPINFO *ftpinfo; const char *remhost;
int ftp_putfile(ftpinfo, rempath, localpath) FTPINFO *ftpinfo; const char *rempath; const char *localpath;
int ftp_pwd(ftpinfo) FTPINFO *ftpinfo;
int ftp_rmdir(ftpinfo, remdir) FTPINFO *ftpinfo; const char *remdir;
int ftp_settype(ftpinfo, type) FTPINFO *ftpinfo; int type;
int ftp_site(ftpinfo, site_cmd) FTPINFO *ftpinfo; const char *site_cmd;
int ftp_tenex(ftpinfo) FTPINFO *ftpinfo;
int ftp_user(ftpinfo, name) FTPINFO *ftpinfo; const char *name;
ftp_prconnect is the first routine called
from this API.
It establishes an FTP connection (control channel)
with a remote host.
ftp_prconnect takes the arguments
ftpinfo and host, where host is the name
of the remote
host to which the
FTP
connection is to be established. The sockfd field of the
FTPINFO
structure stores the value of the socket descriptor used for the control
channel. If the control channel is successfully established,
the connected field
is set to 1 to indicate the existence of a control channel. If the
debug (see ``Debugging'' below) field is set, a server
specific entry is stored
in the ftp_sp field.
Unlike ftp_prconnect, ftp_login performs a complete login to the remote host. ftp_login does the equivalent of calling ftp_prconnect, ftp_user, and ftp_passwd, in that sequence, to login to the remote host through an FTP connection. ftp_login takes the following arguments: ftpinfo, remhost, user, password, and account, where: remhost is the remote host to connect to, user and password are the user's FTP login name and password used to login to the remote host, and account is the TELNET string identifying the user's account.
ftp_command provides a common set of functionality for communicating with the remote host. Many of the other control routines use this routine to accomplish their tasks. The control routines are listed in alphabetical order following ftp_command.
Execution of control routines depends on the existence of an FTP control channel such as that established with ftp_prconnect or ftp_login.
ftp_command sends FTP specific information to the FTP server on the remote host. The routines ftp_chdir, ftp_user, ftp_passwd, ftp_accnt, ftp_mkdir, ftp_rmdir, ftp_del, ftp_pwd, ftp_idle, ftp_site, and ftp_bye are implemented as macros which essentially call this routine to send their respective protocol specific information/keywords to the remote server. This routine takes the following arguments: ftpinfo, optinfo, and action where optinfo is the argument that the protocol specific command takes and action is the protocol specific command itself. For example, ftp_pwd is implemented as a macro via ftp_command where, optinfo is NULL and action is PWD, whereas for ftp_del (which is also implemented as a macro), optinfo is a filename and action is DELE.
ftp_accnt sends the user's account information to the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and account, where account is a TELNET string identifying the user's account.
ftp_appfile appends the local file, localpath, onto the remote file, rempath, if the remote file exists; otherwise, the local file is copied to rempath.
ftp_ascii
sets the data transfer type to
ASCII.
This routine takes the argument ftpinfo. It automatically sets
the transf_type field of the
FTPINFO
structure to
ASCII.
ftp_binary
sets the data transfer type to
BINARY.
This routine takes the argument ftpinfo. It automatically sets
the transf_type field of the
FTPINFO
structure to
BINARY.
ftp_bye closes the FTP connection gracefully. It takes the argument ftpinfo.
ftp_chdir changes the directory on the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and rempath where rempath is the name of the remote directory.
ftp_del deletes a file on the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and file where file is the name of the file that is to be deleted on the remote host.
ftp_ebcdic
is used to set the transfer type to
EBCDIC.
This routine takes the argument ftpinfo. It automatically sets
the transf_type field of the
FTPINFO
structure to
EBCDIC.
ftp_idle sets the idle time for the FTP connection. The local host closes the connection if activity on the connection is idle for this duration. This routine takes the following arguments: ftpinfo and idle_time, where idle_time is the maximum idle time before disconnection.
ftp_mkdir creates a directory on the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and remdir, where remdir is the name of the remote directory to be created.
ftp_passwd sends the user's password to the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and password, where password is the user's FTP password used to login to the remote host.
ftp_pwd gets the current working directory on the remote host through an FTP connection. This routine takes the argument ftpinfo.
ftp_rmdir removes a directory on the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and remdir where remdir is the name of the directory that is to be removed.
ftp_settype
sets the data transfer type for the
FTP
connection.
This routine takes the following arguments:
ftpinfo and type, where type should be one of
ASCII or
BINARY.
It sets the transf_type field of the
FTPINFO
structure to the type specified by type. If any other type is
specified, the msg field of
FTPINFO
is set to indicate that a transfer type not understood by the API
was set and the call returns -1.
ftp_site sends a SITE command to the remote FTP server. This routine takes the following arguments: ftpinfo and site_cmd, where site_cmd is the argument passed to the SITE command.
ftp_tenex
is used to set the transfer type to
TENEX.
This routine takes the argument ftpinfo. It automatically sets
the transf_type field of the
FTPINFO
structure to
TENEX.
ftp_user sends the user's name to the remote host through an FTP connection. This routine takes the following arguments: ftpinfo and name, where name is the user's FTP login name used to login to the remote host.
Before the specific data transfer routines can be invoked, a
data channel must be established on the FTP connection
using the ftp_initconn routine.
It opens a data channel socket (separate from the FTP
control channel socket)
via the PASV command
(if the FTP server supports this) conforming to RFC1579.
If PASV is not supported by the FTP server, then a
conventional open is performed, where the client announces
the port in use via the PORT command.
This routine takes the argument ftpinfo.
The datasd field of
the
FTPINFO
structure stores the value of the socket descriptor used for the data
channel. Setting the linger field to a non-zero
value turns on the socket linger option which in turn sets
the socket linger interval to 60 seconds.
ftp_dir lists the directory on the remote host through an FTP connection. This routine takes the following arguments: ftpinfo, rempath, and localpath where rempath is the name of the remote path whose directory is to be listed and localpath is the name of the output file. If localpath is NULL then the output is displayed on stdout, otherwise it is written into the file specified by localpath.
ftp_getfile
transfers a file from a remote host to the local
host through an
FTP
connection.
This routine takes the following arguments:
ftpinfo, rempath, and localpath, where
rempath is the name
of the remote file and localpath is the name of the file on the
local host. If localpath is
NULL,
then a file with the same name as the remote file is created in the current
local working directory.
If the transf_calc field is nonzero in the
FTPINFO
data structure, the transfer rate is calculated and placed in
the speed
field. If the transf_type field is not set,
the routine automatically
sets it to type
BINARY.
ftp_putfile
transfers a file from the local host to the remote host through
an
FTP
connection.
This routine takes the following arguments:
ftpinfo, rempath, and localpath,
where rempath is the name
of the remote file and localpath is the name of the local file.
If rempath is
NULL,
a remote file with the same name as the local file is created in the current
remote working directory.
If the transf_calc field is nonzero in the
FTPINFO
data structure, the transfer rate is calculated and placed in
the speed field.
If the transf_type field is not set, the routine automatically
sets it to type
BINARY.
The ftp_dataconn routine is typically called by
a specific data transfer routine to provide some common
data transfer functionality.
The routines ftp_dir, ftp_getfile,
and ftp_putfile make use of this routine.
Specifically, ftp_dataconn associates the file descriptor
of the specific routine with the data channel socket.
ftp_dataconn also provides the functionality which
triggers the data transfer, by signalling the remote host
via the FTP control channel.
ftp_dataconn takes the following arguments:
ftpinfo, file, action, and mode,
where file is the file or
path to be worked on at the remote server, action is the protocol
specific command sent to the remote server, and mode
is either r or w depending on the direction
of the transfer. The filedes field
in the
FTPINFO
structure holds the value of the file descriptor for the specific
transfer routine.
In essence, this is
either the destination or source file descriptor depending on the type
of action performed.
ftp_msg field of the
FTPINFO
structure to point to a string indicating the description of
the error. The routines try to return the actual reply code from
the server in the reply field. -1 is returned in this field
if and only if the client program fails to talk to the server during
any specific part of the message transfer.
debug field in the
FTPINFO
structure is nonzero, the FTP command being sent from the
client to the server is printed on stdout. Socket level debugging is
turned on using the setsockopt call. The server specific entry is
stored in the ftp_sp field. This feature, in conjunction
with the ftp_msg and reply fields,
can be used to obtain valuable
debugging information.
#include <stdio.h> #include <net/libftp.h>#define NORMAL 0 #define ABNORMAL 1 #define ON 1 #define OFF 0
main (argc, argv) int argc; char *argv[]; { FTPINFO ftpinfo; void usage(), check_n_close(); char *progname; char *host; progname = (char *) argv[0]; if ( argc < 2 ) (void) usage(progname);
host = argv[1]; ftpinfo.debug = ON; ftpinfo.transf_calc = ON; ftpinfo.linger = OFF;
/* * connect to peer at remote host. */ if (ftp_prconnect ( &ftpinfo, host ) < 0) { printf("error: ftp_prconnect failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * send user name to the remote server. */ if (ftp_user( &ftpinfo, "root" ) < 0) { printf("error: ftp_user failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * send user password to the remote server. */ if (ftp_passwd ( &ftpinfo, "hitme" ) < 0) { printf("error: ftp_passwd failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); } /* * set the idle time for this connection. */ if (ftp_idle ( &ftpinfo, "7200" ) < 0) { printf("error: ftp_idle failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); } /* * do a 'cd' on the remote ftp server. */ if (ftp_chdir( &ftpinfo, "/tmp" ) < 0) { printf("error: ftp_chdir failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * do a 'pwd' on the remote ftp server. */ if (ftp_pwd ( &ftpinfo ) < 0) { printf("error: ftp_pwd failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * set transfer mode to ascii. */ if (ftp_ascii ( &ftpinfo ) < 0) { printf("error: ftp_ascii failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * set transfer mode to binary. */ if (ftp_binary ( &ftpinfo ) < 0) { printf("error: ftp_binary failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * set transfer mode back to ascii - using ftp_settype. */ if (ftp_settype ( &ftpinfo, ASCII ) < 0) { printf("error: ftp_settype failed in ascii mode.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * set transfer mode back to binary - using ftp_settype. */ if (ftp_settype ( &ftpinfo, BINARY ) < 0) { printf("error: ftp_settype failed in binary mode.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * make a directory under /tmp on the server. */ if (ftp_mkdir ( &ftpinfo, "prem" ) < 0) { printf("error: ftp_mkdir failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); } /* * change the mode of the directory created above. */ if (ftp_site ( &ftpinfo, "chmod 775 prem" ) < 0) { printf("error: ftp_site failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * remove the directory created above. */ if (ftp_rmdir ( &ftpinfo, "prem" ) < 0) { printf("error: ftp_rmdir failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * quit the FTP session decently. */ if (ftp_bye( &ftpinfo ) < 0) { printf("error: ftp_bye failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * use ftp_login to login into the remote ftp server and quit. */ if (ftp_login ( &ftpinfo, host, "root", "hitme", NULL ) < 0) { printf("error: ftp_login failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * do a 'put' to the remote host. */ if (ftp_putfile ( &ftpinfo, "/tmp/passwd", "/etc/passwd" ) < 0) { printf("error: ftp_putfile failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); } else { printf("transfer speed: \n"); printf("\t\tbytes transferred = %ld\n", ftpinfo.speed.size_bytes); printf("\t\ttime taken = %.2g seconds\n", ftpinfo.speed.seconds); printf("\t\trate = %.2g Kbytes/s\n", ftpinfo.speed.kbs); }
/* * set transfer mode back to ascii - using ftp_settype. */ if (ftp_settype ( &ftpinfo, ASCII ) < 0) { printf("error: ftp_settype failed in ascii mode.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * do a 'get' from the remote host. */ if (ftp_getfile ( &ftpinfo, "/tmp/passwd","/d1/tmp/passwd" )< 0){ printf("error: ftp_getfile failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); } else { printf("transfer speed: \n"); printf("\t\tbytes transferred = %ld\n", ftpinfo.speed.size_bytes); printf("\t\ttime taken = %.2g seconds\n", ftpinfo.speed.seconds); printf("\t\trate = %.2g Kbytes/s\n", ftpinfo.speed.kbs); }
/* * list /tmp on remote host to file /tmp/test. */ if (ftp_dir ( &ftpinfo, "/tmp", "/tmp/test" ) < 0) { printf("error: ftp_dir failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * list /tmp on remote host to stdout. */ if (ftp_dir ( &ftpinfo, "/tmp", NULL ) < 0) { printf("error: ftp_dir failed to write to stdout.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * delete the file on the remote host. */ if (ftp_del ( &ftpinfo, "/tmp/asciifile" ) < 0) { printf("error: ftp_del failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * quit the FTP sessions decently. */ if (ftp_bye( &ftpinfo ) < 0) { printf("error: ftp_bye failed.\n"); (void) check_n_close ( &ftpinfo, ABNORMAL ); }
/* * we're done with our job...so exit the program gracefully. */ (void) check_n_close ( &ftpinfo, NORMAL );
}
void usage(progname) char *progname; { printf("usage: %s <remhost>\n", progname); exit (1); }
void check_n_close ( ftpinfo, status ) FTPINFO *ftpinfo; int status; { if (ftpinfo -> sockfd >= 0) close (ftpinfo -> sockfd); if (status == ABNORMAL) printf("error: %s\n", ftpinfo -> ftp_msg); else printf("success: %s\n", ftpinfo -> ftp_msg);
printf("final reply from server: %d\n", ftpinfo -> reply); fflush ( stdout ); exit (status); }