telnet_srccode

所属分类:Linux/Unix编程
开发工具:Unix_Linux
文件大小:88KB
下载次数:224
上传日期:2006-11-25 20:04:55
上 传 者zarker
说明:  linux 下 telnet源码,内有详细readme说明
(telnet under linux source, which shows a detailed readme)

文件列表:
authenc.c (3300, 1993-06-07)
commands.c (71695, 1995-05-31)
defines.h (2715, 1993-06-07)
externs.h (14550, 1995-05-31)
fdset.h (2260, 1993-06-07)
general.h (2149, 1993-06-07)
krb4-proto.h (5921, 1993-05-21)
main.c (8064, 1995-05-31)
Makefile (2907, 1993-06-07)
network.c (4829, 1993-12-16)
ring.c (8721, 1995-05-31)
ring.h (3727, 1993-06-07)
sys_bsd.c (27387, 1995-05-31)
telnet.c (58831, 1995-05-31)
terminal.c (5742, 1995-02-17)
tn3270.c (9911, 1995-05-31)
types.h (2356, 1993-06-07)
utilities.c (23923, 1995-05-31)

This is a distribution of both client and server telnet. These programs have been compiled on: telnet telnetd 4.4 BSD-Lite x x 4.3 BSD Reno X X UNICOS 9.1 X X UNICOS 9.0 X X UNICOS 8.0 X X BSDI 2.0 X X Solaris 2.4 x x (no linemode in server) SunOs 4.1.4 X X (no linemode in server) Ultrix 4.3 X X (no linemode in server) Ultrix 4.1 X X (no linemode in server) In addition, previous versions have been compiled on the following machines, but were not available for testing this version. telnet telnetd Next1.0 X X UNICOS 8.3 X X UNICOS 7.C X X UNICOS 7.0 X X SunOs 4.0.3c X X (no linemode in server) 4.3 BSD X X (no linemode in server) DYNIX V3.0.12 X X (no linemode in server) Ultrix 3.1 X X (no linemode in server) Ultrix 4.0 X X (no linemode in server) SunOs 3.5 X X (no linemode in server) SunOs 4.1.3 X X (no linemode in server) Solaris 2.2 x x (no linemode in server) Solaris 2.3 x x (no linemode in server) BSDI 1.0 X X BSDI 1.1 X X DYNIX V3.0.17.9 X X (no linemode in server) HP-UX 8.0 x x (no linemode in server) This code should work, but there are no guarantees. May 30, 1995 This release represents what is on the 4.4BSD-Lite2 release, which should be the final BSD release. I will continue to support of telnet, The code (without encryption) is available via anonymous ftp from ftp.cray.com, in src/telnet/telnet.YY.MM.DD.NE.tar.Z, where YY.MM.DD is replaced with the year, month and day of the release. If you can't find it at one of these places, at some point in the near future information about the latest releases should be available from ftp.borman.com. In addition, the version with the encryption code is available via ftp from net-dist.mit.edu, in the directory /pub/telnet. There is a README file there that gives further information on how to get the distribution. Questions, comments, bug reports and bug fixes can be sent to one of these addresses: dab@borman.com dab@cray.com dab@bsdi.com This release is mainly bug fixes and code cleanup. Replace all calls to bcopy()/bzero() with calls to memmove()/memset() and all calls to index()/rindex() with calls to strchr()/strrchr(). Add some missing diagnostics for option tracing to telnetd. Add support for BSDI 2.0 and Solaris 2.4. Add support for UNICOS 8.0 Get rid of expanded tabs and trailing white spaces. From Paul Vixie: Fix for telnet going into an endless spin when the session dies abnormally. From Jef Poskanzer: Changes to allow telnet to compile under SunOS 3.5. From Philip Guenther: makeutx() doesn't expand utmpx, use pututxline() instead. From Chris Torek: Add a sleep(1) before execing login to avoid race condition that can eat up the login prompt. Use terminal speed directly if it is not an encoded value. From Steve Parker: Fix to realloc() call. Fix for execing login on solaris with no user name. January 19, 1994 This is a list of some of the changes since the last tar release of telnet/telnetd. There are probably other changes that aren't listed here, but this should hit a lot of the main ones. General: Changed #define for AUTHENTICATE to AUTHENTICATION Changed #define for ENCRYPT to ENCRYPTION Changed #define for DES_ENCRYPT to DES_ENCRYPTION Added support for SPX authentication: -DSPX Added support for Kerberos Version 5 authentication: -DKRB5 Added support for ANSI C function prototypes Added support for the NEW-ENVIRON option (RFC-1572) including support for USERVAR. Made support for the old Environment Option (RFC-1408) conditional on -DOLD_ENVIRON Added #define ENV_HACK - support for RFC 1571 The encryption code is removed from the public distributions. Domestic 4.4 BSD distributions contain the encryption code. ENV_HACK: Code to deal with systems that only implement the old ENVIRON option, and have reversed definitions of ENV_VAR and ENV_VAL. Also fixes ENV processing in client to handle things besides just the default set... NO_BSD_SETJMP: UNICOS configuration for UNICOS 6.1/6.0/5.1/5.0 systems. STREAMSPTY: Use /dev/ptmx to get a clean pty. This is for SVr4 derivatives (Like Solaris) UTMPX: For systems that have /etc/utmpx. This is for SVr4 derivatives (Like Solaris) Definitions for BSDI 1.0 Definitions for 4.3 Reno and 4.4 BSD. Definitions for UNICOS 8.0 and UNICOS 7.C Definitions for Solaris 2.0 Definitions for HP-UX 8.0 Latest Copyright notices from Berkeley. FLOW-CONTROL: support for RFC-XXXx Client Specific: Fix the "send" command to not send garbage... Fix status message for "skiprc" Make sure to send NAWS after telnet has been suspended or an external command has been run, if the window size has changed. sysV88 support. Server Specific: Support flowcontrol option in non-linemode servers. -k Server supports Kludge Linemode, but will default to either single character mode or real Linemode support. The user will have to explicitly ask to switch into kludge linemode. ("stty extproc", or escape back to to telnet and say "mode line".) -u Specify the length of the hostname field in the utmp file. Hostname longer than this length will be put into the utmp file in dotted decimal notation, rather than putting in a truncated hostname. -U Registered hosts only. If a reverse hostname lookup fails, the connection will be refused. -f/-F Allows forwarding of credentials for KRB5. Februrary 22, 1991: Features: This version of telnet/telnetd has support for both the AUTHENTICATION and ENCRYPTION options. The AUTHENTICATION option is fairly well defined, and an option number has been assigned to it. The ENCRYPTION option is still in a state of flux; an option number has been assigned to, but it is still subject to change. The code is provided in this release for experimental and testing purposes. The telnet "send" command can now be used to send do/dont/will/wont commands, with any telnet option name. The rules for when do/dont/will/wont are sent are still followed, so just because the user requests that one of these be sent doesn't mean that it will be sent... The telnet "getstatus" command no longer requires that option printing be enabled to see the response to the "DO STATUS" command. A -n flag has been added to telnetd to disable keepalives. A new telnet command, "auth" has been added (if AUTHENTICATE is defined). It has four sub-commands, "status", "disable", "enable" and "help". A new telnet command, "encrypt" has been added (if ENCRYPT is defined). It has many sub-commands: "enable", "type", "start", "stop", "input", "-input", "output", "-output", "status", and "help". The LOGOUT option is now supported by both telnet and telnetd, a new command, "logout", was added to support this. Several new toggle options were added: "autoencrypt", "autodecrypt", "autologin", "authdebug", "encdebug", "skiprc", "verbose_encrypt" An "rlogin" interface has been added. If the program is named "rlogin", or the "-r" flag is given, then an rlogin type of interface will be used. ~. Terminates the session ~ Suspend the session ~^] Escape to telnet command mode ~~ Pass through the ~. BUG: If you type the rlogin escape character in the middle of a line while in rlogin mode, you cannot erase it or any characters before it. Hopefully this can be fixed in a future release... General changes: A "libtelnet.a" has now been created. This libraray contains code that is common to both telnet and telnetd. This is also where library routines that are needed, but are not in the standard C library, are placed. The makefiles have been re-done. All of the site specific configuration information has now been put into a single "Config.generic" file, in the top level directory. Changing this one file will take care of all three subdirectories. Also, to add a new/local definition, a "Config.local" file may be created at the top level; if that file exists, the subdirectories will use that file instead of "Config.generic". Many 1-2 line functions in commands.c have been removed, and just inserted in-line, or replaced with a macro. Bug Fixes: The non-termio code in both telnet and telnetd was setting/clearing CTLECH in the sg_flags word. This was incorrect, and has been changed to set/clear the LCTLECH bit in the local mode word. The SRCRT #define has been removed. If IP_OPTIONS and IPPROTO_IP are defined on the system, then the source route code is automatically enabled. The NO_GETTYTAB #define has been removed; there is a compatability routine that can be built into libtelnet to achive the same results. The server, telnetd, has been switched to use getopt() for parsing the argument list. The code for getting the input/output speeds via cfgetispeed()/cfgetospeed() was still not quite right in telnet. Posix says if the ispeed is 0, then it is really equal to the ospeed. The suboption processing code in telnet now has explicit checks to make sure that we received the entire suboption (telnetd was already doing this). The telnet code for processing the terminal type could cause a core dump if an existing connection was closed, and a new connection opened without exiting telnet. Telnetd was doing a TCSADRAIN when setting the new terminal settings; This is not good, because it means that the tcsetattr() will hang waiting for output to drain, and telnetd is the only one that will drain the output... The fix is to use TCSANOW which does not wait. Telnetd was improperly setting/clearing the ISTRIP flag in the c_lflag field, it should be using the c_iflag field. When the child process of telnetd was opening the slave side of the pty, it was re-setting the EXTPROC bit too early, and some of the other initialization code was wiping it out. This would cause telnetd to go out of linemode and into single character mode. One instance of leaving linemode in telnetd forgot to send a WILL ECHO to the client, the net result would be that the user would see double character echo. If the MODE was being changed several times very quickly, telnetd could get out of sync with the state changes and the returning acks; and wind up being left in the wrong state. September 14, 1990: Switch the client to use getopt() for parsing the argument list. The 4.3Reno getopt.c is included for systems that don't have getopt(). Use the posix _POSIX_VDISABLE value for what value to use when disabling special characters. If this is undefined, it defaults to 0x3ff. For non-termio systems, TIOCSETP was being used to change the state of the terminal. This causes the input queue to be flushed, which we don't want. This is now changed to TIOCSETN. Take out the "#ifdef notdef" around the code in the server that generates a "sync" when the pty oputput is flushed. The potential problem is that some older telnet clients may go into an infinate loop when they receive a "sync", if so, the server can be compiled with "NO_URGENT" defined. Fix the client where it was setting/clearing the OPOST bit in the c_lflag field, not the c_oflag field. Fix the client where it was setting/clearing the ISTRIP bit in the c_lflag field, not the c_iflag field. (On 4.3Reno, this is the ECHOPRT bit in the c_lflag field.) The client also had its interpretation of WILL BINARY and DO BINARY reversed. Fix a bug in client that would cause a core dump when attempting to remove the last environment variable. In the client, there were a few places were switch() was being passed a character, and if it was a negative value, it could get sign extended, and not match the 8 bit case statements. The fix is to and the switch value with 0xff. Add a couple more printoption() calls in the client, I don't think there are any more places were a telnet command can be received and not printed out when "options" is on. A new flag has been added to the client, "-a". Currently, this just causes the USER name to be sent across, in the future this may be used to signify that automatic authentication is requested. The USER variable is now only sent by the client if the "-a" or "-l user" options are explicity used, or if the user explicitly asks for the "USER" environment variable to be exported. In the server, if it receives the "USER" environment variable, it won't print out the banner message, so that only "Password:" will be printed. This makes the symantics more like rlogin, and should be more familiar to the user. (People are not used to getting a banner message, and then getting just a "Password:" prompt.) Re-vamp the code for starting up the child login process. The code was getting ugly, and it was hard to tell what was really going on. What we do now is after the fork(), in the child: 1) make sure we have no controlling tty 2) open and initialize the tty 3) do a setsid()/setpgrp() 4) makes the tty our controlling tty. On some systems, #2 makes the tty our controlling tty, and #4 is a no-op. The parent process does a gets rid of any controlling tty after the child is fork()ed. Use the strdup() library routine in telnet, instead of the local savestr() routine. If you don't have strdup(), you need to define NO_STRDUP. Add support for ^T (SIGINFO/VSTATUS), found in the 4.3Reno distribution. This maps to the AYT character. You need a 4-line bugfix in the kernel to get this to work properly: > *** tty_pty.c.ORG Tue Sep 11 09:41:53 1990 > --- tty_pty.c Tue Sep 11 17:48:03 1990 > *************** > *** 609,613 **** > if ((tp->t_lflag&NOFLSH) == 0) > ttyflush(tp, FREAD|FWRITE); > ! pgsignal(tp->t_pgrp, *(unsigned int *)data); > return(0); > } > --- 609,616 ---- > if ((tp->t_lflag&NOFLSH) == 0) > ttyflush(tp, FREAD|FWRITE); > ! pgsignal(tp->t_pgrp, *(unsigned int *)data, 1); > ! if ((*(unsigned int *)data == SIGINFO) && > ! ((tp->t_lflag&NOKERNINFO) == 0)) > ! ttyinfo(tp); > return(0); > } The client is now smarter when setting the telnet escape character; it only sets it to one of VEOL and VEOL2 if one of them is undefined, and the other one is not already defined to the telnet escape character. Handle TERMIOS systems that have seperate input and output line speed settings imbedded in the flags. Many other minor bug fixes. June 20, 1990: Re-organize makefiles and source tree. The telnet/Source directory is now gone, and all the source that was in telnet/Source is now just in the telnet directory. Seperate makefile for each system are now gone. There are two makefiles, Makefile and Makefile.generic. The "Makefile" has the definitions for the various system, and "Makefile.generic" does all the work. There is a variable called "WHAT" that is used to specify what to make. For example, in the telnet directory, you might say: make 4.4bsd WHAT=clean to clean out the directory. Add support for the ENVIRON and XDISPLOC options. In order for the server to work, login has to have the "-p" option to preserve environment variables. Add the SOFT_TAB and LIT_ECHO modes in the LINEMODE support. Add the "-l user" option to command line and open command (This is passed through the ENVIRON option). Add the "-e" command line option, for setting the escape character. Add the "-D", diagnostic, option to the server. This allows the server to print out debug information, which is very useful when trying to debug a telnet that doesn't have any debugging ability. Turn off the literal next character when not in LINEMODE. Don't recognize ^Y locally, just pass it through. Make minor modifications for Sun4.0 and Sun4.1 Add support for both FORW1 and FORW2 characters. The telnet escpape character is set to whichever of the two is not being used. If both are in use, the escape character is not set, so when in linemode the user will have to follow the escape character with a or
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