File Transfer Protocol - FTP
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1 File Transfer Protocol - FTP TCP/IP class 1
2 outline intro kinds of remote file access mechanisms ftp architecture/protocol traditional BSD ftp client ftp protocol command interface ftp trace (high-level) higher-level services on ftp + summary 2
3 intro divide world into file transfer utilities ftp - put/get single files, multiple files with mget but not file tree (except via 3rd party archive utility like tar), password required tftp - trivial file xfer, no password rcp - BSD utility like UNIX cp, can do recursive tree copy (-r), weak security (.rhost) and distributed file systems NFS - UDP based, local file systems Unix V.3 RFS, Andrew, non-tcp/ip Novell 3
4 FTP/telnet vs BSD apps IETF BSD file xfer ftp/tftp rcp/rsh/rshd virtual terminal telnet rlogin 4
5 intro RFC 959, more in RFC 1123 ftp well-established file xfer mechanism ftp/telnet classic IETF apps ftp servers offer up files with a certain amount of ad hoc per-site organization, basically used for file xfer when you already know what it is you are after, not browsing so much 5
6 intro - what ftp can do you can xfer single files, ASCII/binary you can t xfer a file tree you can do multiple files in the same directory at once though (mget/mput) xfer file directory workaround as follows: 6
7 intro - directory xfer workaround to compress a file tree: tar -cvf foo.tar foo.dir compress foo.tar -> foo.tar.z to fetch and unwrap (ftp) get foo.tar cd <desired location> uncompress foo.tar.z tar -xvf foo.tar 7
8 intro - anonymous ftp anonymous ftp servers offers up files on server with no need to for password for user convenience, server security isn t impaired unix anon-ftp server runs via chroot(2) call to /usr/ftp (or wherever), appears to client (and server) as root of file system anon login: user: ftp (or anonymous) password: username@dns.site 8
9 ftp architecture/protocol ftp uses ASCII commands for ftp protocol on TCP port 21 protocol commands are simple verb object <cr> <nl> RETR filename <cr> <nl> (get a file) ASCII success/error status comes back from server; e.g., 226 transfer complete separate socket channel used for data xfer after client RETR, server connects from port 20 to client port sent via client PORT command OR PASV command can be used to tell server to wait for client connection 9
10 ftp architecture picture user interface user pi or protocol interpreter port 21 commands/ replies user pi or protocol interpreter dtp or data xfer process data port 20 dtp or data xfer process connection 10
11 ftp protocol versus ftp client understand that an ftp client uses the ftp protocol to talk to a server the client get file command is translated somehow into the ftp protocol command; e.g. BSD ftp client has command: get file ftp protocol uses RETR file to implement get 11
12 some ftp lingo ASCII - ftp uses ASCII char. set for commands borrowed from TELNET definitions control connection - to server port 21 data connection - from server port 20 EOL - cr/lf. telnet eof. mode: data has modes, stream/block/compressed NVT - network virtual terminal, telnet abstraction reply - ftp command ack, number followed by human readable message 12
13 more ftp lingo data structure: file, record, page, file means byte stream type - data is typed, ASCII, EBCDIC, IMAGE. image means binary 3-party xfer. possible for one client to talk to two ftp servers and tell them to xfer a file 13
14 file typing boo, hiss BSD client defaults to ASCII (ftp) binary if ASCII mode, both client server must translate lines into telnet eol (cr/nl) and translate back acc. to native host ASCII 14
15 file typing con: xfer binary file from UNIX to DOS in (default?) ASCII mode file maybe (likely) corrupted assume original has <nl>, unix adds <cr><nl>, dos leaves it alone, file now larger... slower anyway because we have to scan per char pro: xfer ASCII file from DOS to UNIX 1. DOS converts from <cr,nl> to <cr,nl> 2. UNIX converts from <cr,nl> to <nl> you don t need to do anything else... 15
16 classic BSD client syntax: % ftp host ip address % ftp connection (ftp) open host ip (ftp) user name [password] (ftp) password (prompted for after user) (ftp) close help (ftp) help [command] 16
![name [password] (ftp) password (prompted for](/docs-images/44/13812442/images/page_16.jpg "after user) (ftp) close help (ftp) help")
17 ftp commands, cont. file xfer (ftp) ascii - set ASCII xfer type (ftp) binary - set IMAGE xfer type (ftp) hash - print hash mark during file xfer (ftp) get remote-file [local-file] (ftp) put local-file [remote-file] (ftp) mget remote-files» (ftp) prompt - toggle, on by default, you want it off (ftp) mput local-file 17
18 file commands, cont directory ops (ftp) cwd <pathname> - change on server (ftp) lcwd <pathname> - change on client (ftp) pwd - print cwd on server (ftp)!pwd - print on client (ftp) dir - same as (ftp) ls» can do ls -lr as unix server-side hack 18
19 ftp commands, cont misc. (ftp)!sh - escape to UNIX command shell (ftp) get file (ftp)!vi file (ftp) delete file (ftp) mdelete files (ftp) rmdir dir (ftp) mkdir dir 19
20 unix ftp replacement - ncftp many features over stock BSD ftp default is to do anon. login, you don t have to do it (ncftp) get foo*bar - works with wildcards IMAGE type is default shows you how much of file is xferred mget works automatically - no prompting 20
21 ftp protocol commands sent to server on well-known port 21 typically gets FTP response, success/error 200 fine by me... connection start/shutdown USER <sp> <username> <crlf> PASS <sp> <password> <crlf> QUIT <crlf> SYST <crlf> - find out server os type 21
22 ftp protocol commands file xfer RETR <sp> <pathname> <crlf> (get file) STOR <sp> <pathname> <crlf> PORT <sp> <host,port> <crlf>» 6 bytes in decimal, h1,h2,h3,h4,p1,p2 PASV <crlf> (tells server to go to passive mode for data xfer) ABOR <crlf> - abort file xfer 22
23 ftp protocol commands directory ops CWD <sp> <pathname> <crlf> (on server) PWD <crlf> LIST [<sp> <pathname>] <crlf> NLST [<sp> <pathname>] <crlf> RMD <sp> <pathname> <crlf> (rmdir) MKD <sp> <pathname> <crlf> (mkdir) 23
24 LIST or NLST for dir list? according to RFC, LIST is for humans, NLST for machines (e.g., for mget) LIST may have non-interoperable file list (e..g, UNIX ls -l) NLST should just be the filenames with nothing else use NLST for mget, where you want to get list of filenames to start with 24
25 LIST/NLIST cont. BSD mget works as follows (ftp) mget *.foo PORT command sent NLST *.foo then will get a.foo, b.foo... z.foo SunOs ftp and ncftp (ftp) ls -> NLST (like ls in format) (ftp) dir -> LIST (which is ls -l in format) 4.4 BSD ftp has ls and dir as LIST 25
26 replies (and errors) every command must have at least 1 reply reply can be multi-line (e.g., SYST, STAT, etc. are most common) format: 3 digit number<sp>text multiline: replace <sp> with -, last line has space theory: 3 digit number for machine, text for people digit 1: good, bad, incomplete digit 2: function groupings (syntax/info/connection/authentication/file system) digit 3: particular meaning 26
27 reply codes - 1st digit 1yz - positive preliminary reply 2yz - positive completion reply 3yz - positive intermediate reply 4yz - transient negative completion reply (try again later) 5yz - permanent negative completion reply 27
28 ftp replies- examples 200 okay 226 Transfer complete 550 foobar: No such file or directory 150 Opening ASCII mode data connection for /bin/ls 331 Guest login ok, send guest as password 220-howdy, howdy 220 howdy... 28
29 ftp protocol trace use ftp client and turn debug switch on result is that ftp commands are shown note PORT gives 6 decimal bytes, ip address in dotted decimal + client port # h1,h2,h3,h4,p1,p2 e.g., 127,0,0,1,4,7, ip addr == client port == (4*256)+7 =
30 protocol trace 1 of 3 % ftp nic.ddn.mil 220-****Welcome to the Network Information Center and more Name: anonymous 331 Guest login ok, send guest as password Password: 230 Guest login ok, access restrictions apply (ftp) debug (ftp) ls ---> PORT 131,252,20,183,8, Port command successful ---> NLST 30
31 protocol trace 2 of Opening ASCII mode data connection for file list lost+found netinfo bin ietf... rfc Transfer Complete 170 bytes received in seconds (3.5 Kbytes/s) (ftp) cd rfc ---> CWD rfc 250 CWD command successful 31
32 protocol trace 3 of 3 (ftp) binary ---> TYPE I (ftp) get rfc959.txt ---> PORT 131,252,20,183,8, PORT command successful. ---> RETR rfc959.txt 150 Opening BINARY mode data connection for rfc959.txt ( bytes) 226 Transfer complete. local: rfc959.txt remote: rfc959.txt bytes received in 27 seconds (5.3 Kbytes/s) (ftp) quit ---> QUIT (followed by server s 221 Goodbyte) 32
33 services built on ftp archie - find src code by filename ftp servers register to be walked archie uses ls -lr listing to index filenames /web access http - single shot ftp access ftp is connected though and you can have problems with anon server limits alex - distributed anonymous ftp files /alex/edu/pdx/cs/ftp/pub/blackadder 33
34 ftp summary great majority of use is anonymous ftp simple ASCII commands, similar mechanism used by http/smtp/nntp too. avoids byte-swapping problems ftp is still workhouse of Inet for mass file xfer available in web browsers, con is per connection file xfer or dir listing web browser not good way to xfer a billion files lack of support for recursive dir. xfer is con another con: passwords in the clear 34
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