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1 | README for init/getty/login, by poe@daimi.aau.dk |
2 | ||
726f69e2 | 3 | This package contains simpleinit, agetty, and login programs for Linux. |
6dbe3af9 KZ |
4 | Additional utilities included are: hostname, who, write, wall, users |
5 | domainname, hostid, cage and mesg. | |
6 | ||
7 | Most of this software has been contributed by others, I basically just | |
8 | ported the things to Linux. | |
9 | ||
fd6b7a7f KZ |
10 | Version 1.49 (20-Jun-97) |
11 | Small patches for new util-linux distribution and glibc compat. | |
12 | PAM support in login.c by Erik Troan. | |
13 | ||
14 | Version 1.48 (6-Jun-97) | |
15 | Now changes mode and owner of /dev/vcs devices for console logins. | |
16 | After idea by Andries Brouwer. | |
17 | ||
18 | Version 1.47 (2-Apr-97) | |
2bb3aa36 | 19 | Got new version of hostid.c and hostid.1 from |
fd6b7a7f | 20 | Sander van Malssen <svm@kozmix.ow.nl>. |
2bb3aa36 EM |
21 | Removed premature endutent() call in login.c, simpleinit.c and |
22 | agetty.c to be compatible with the changed semantics of gnu libc2. | |
fd6b7a7f KZ |
23 | Fix by Jesse Thilo <Jesse.Thilo@pobox.com>. |
24 | ||
25 | Version 1.46 (28-Jan-97) | |
26 | Several security fixes for login by David Holland (buffer overruns) | |
27 | <dholland@hcs.harvard.edu> | |
28 | Fixed write.c, to handle a terminating period correctly. | |
29 | Re-indented login.c, it was getting too messy. | |
30 | ||
31 | Version 1.45a (16-Dec-96) | |
32 | Better support in login for shadow passwords. Compile with | |
33 | -DSHADOW_PWD if you have <shadow.h>. This is on by default. | |
34 | By Marek Michalkiewicz <marekm@i17linuxb.ists.pwr.wroc.pl>. | |
35 | Changed the wtmp locking scheme in login.c,agetty.c,simpleinit.c | |
36 | to flock() /etc/wtmplock instead of the wtmp file directly. | |
37 | This avoids a denial of service attack. | |
38 | Some support for the RB-1 Cryptocard token for challenge/response | |
39 | authentication. This needs a DES library, either Eric Young's | |
40 | libdes, or the Koontz implementation, see cryptocard.c. | |
2bb3aa36 | 41 | Initial support patch by Randolph Bentson, |
fd6b7a7f KZ |
42 | <bentson@grieg.seaslug.org> |
43 | Changed getpass() to use fputs() instead of fprintf(). | |
44 | ||
45 | Version 1.44 (13-Nov-96): | |
46 | Made isapty() in checktty.c more resilient to 2.0 systems | |
47 | that haven't re-MAKEDEV'ed their pty devices. | |
48 | ||
49 | Version 1.43 (8-Nov-96): | |
50 | Fix to checktty.c: PTY's are numbered differently after 1.3, | |
51 | blush! Fix by Gerhard Schneider <gs@ilfb.tuwien.ac.at> | |
52 | ||
53 | Version 1.42c (6-Nov-96): | |
54 | Small fix by Gabriel M. Schuyler <schuyler@easiest.com>, to get | |
55 | better syslog messages (1 LOGIN FAILURE instead of 2 LOGIN FAILURES). | |
56 | Patch butchered by me. | |
57 | ||
58 | Version 1.42b (30-Sep-96): | |
59 | Got patch for checktty.c from Christoph Lameter | |
60 | <clameter@miriam.fuller.edu> so it doesn't traverse the groupfile | |
61 | "manually" but uses the getgroups() call, this is more efficient | |
62 | with large groupfiles and NIS/YP. | |
63 | ||
64 | Version 1.42a (24-Sep-96): | |
65 | Added extra syslog() call to login.c to log all good logins. | |
66 | Patch from Steve Philp. | |
67 | ||
68 | Version 1.41 (20-Jul-96): | |
69 | Added security fix to checktty.c by JDS to clear certain lists. | |
70 | Patches butchered and ANSI'fied by me. | |
71 | Added -n option to agetty to avoid the login prompt. | |
72 | ||
73 | Version 1.40a (29-Dec-95): | |
74 | Added -f <issue_file> option to agetty. Patches from Eric Rasmussen | |
75 | <ear@usfirst.org>, but somewhat butchered by me. | |
76 | ||
77 | Version 1.39 (25-Oct-95): | |
2bb3aa36 | 78 | Lots of testing and bugfixes in agetty. Now the modem init stuff |
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79 | should finally work (for me). Also wrote modem.agetty as an example |
80 | on how to use agetty with a modem. | |
81 | Agetty now also supports baud rates of 38400, 57600, 115200 and | |
82 | 230400 bps. | |
6dbe3af9 | 83 | |
726f69e2 KZ |
84 | Version 1.37 (15-Sep-95): |
85 | Added -I <initstring> and -w options to agetty.c for those that | |
86 | use agetty with modems. | |
87 | ||
2bb3aa36 | 88 | Version 1.36 (25-Aug-95): |
726f69e2 KZ |
89 | Enhanced /etc/usertty features with group support. Moved this part |
90 | of login.c to checktty.c. One can now define classes of hosts and | |
91 | ttys and do access checking based on unix-group membership. See | |
92 | login.1. Also time ranges for logins can be specified, for example | |
93 | writing the line | |
94 | ||
95 | joe [mon:tue:wed:thu:fri:8-16]@barracuda [mon:tue:wed:thu:fri:0-7:17-23]@joes.pc.at.home [sat:sun:0-23]@joes.pc.at.home | |
96 | ||
97 | says that during working hours, Joe may rlogin from the host | |
98 | barracuda, whereas outside working hours and in weekends Joe may | |
99 | rlogin from his networked PC at home. | |
100 | ||
101 | login.c: failures was not properly initialized, it now is. Also | |
102 | made sure ALL failures are really logged to syslog. | |
103 | ||
104 | Version 1.35 (7-Aug-95): | |
105 | login.c: Much improved features for the usertty file, allows | |
2bb3aa36 | 106 | access control based on both hostnames/addresses and line. See the |
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107 | about.usertty file and the man-page. |
108 | ||
109 | Fixed agetty so it doesn't fiddle with the ut_id field in the | |
110 | utmp record, this should prevent growing utmps on systems with | |
2bb3aa36 | 111 | more than 10 login lines. Fix suggested and checked by Alan Wendt |
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112 | <alan@ezlink.com> in his agetty.1.9.1a. |
113 | ||
114 | Agetty now installs as agetty again, not as getty. | |
115 | Updated man-page for login(1) to document /etc/usertty changes. | |
116 | ||
117 | This has been tested on Linux 1.2.5 with GCC 2.5.8 and libc 4.5.26. | |
118 | ||
119 | Version 1.33a (20-Jun-95): | |
120 | rchatfie@cavern.nmsu.edu ("rc.") suggested that I should remove | |
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121 | the #ifndef linux around the special logging of dial-up |
122 | logins. This is now done, so each login via a serial port | |
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123 | generates a separate DIALUP syslog entry. |
124 | ||
125 | Version 1.33 (5-Jun-95): | |
126 | Patch by Ron Sommeling <sommel@sci.kun.nl> and | |
127 | jlaiho@ichaos.nullnet.fi (Juha Laiho) for agetty.c, used | |
128 | to return a pointer to an automatic variable in get_logname(). | |
129 | Many patches from or via Rickard Faith <faith@cs.unc.edu>, fixing | |
130 | man-pages etc, now defaults to using /var/log/wtmp and /var/run/utmp | |
131 | according to the new FSSTND. | |
132 | ||
133 | Fix in login.c for CPU eating bug when a remote telnet client dies | |
134 | while logging in. | |
135 | ||
136 | This is for Linux 1.2, GCC 2.6.2 or later. | |
137 | ||
138 | Version 1.32b (12-Mar-95): | |
139 | Login now sets the tty group to "tty" instead of "other". Depending | |
140 | on compile-time define USE_TTY_GROUP the tty mode is set to 0620 or | |
141 | 0600 instead of 0622. All as per suggestion by Rik Faith and the | |
142 | linux-security list. | |
143 | Write/wall now strips control chars except BEL (\007). Again after | |
144 | suggestion by Rik Faith. | |
145 | ||
146 | Version 1.32a | |
147 | Urgent security patch from Alvaro M. Echevarria incorporated into | |
148 | login.c. This is really needed on machines running YP until | |
149 | the libraries are fixed. | |
150 | ||
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151 | Version 1.32 |
152 | Login now logs the ip-address of the connecting host to utmp as it | |
153 | should. | |
154 | ||
155 | Version 1.31b (2-Feb-95): | |
2bb3aa36 EM |
156 | Daniel Quinlan <quinlan@yggdrasil.com> and Ross Biro |
157 | <biro@yggdrasil.com> suggested a patch to login.c that allows for | |
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158 | shell scripts in the shell field of /etc/passwd, so one can now |
159 | have (as a line in /etc/passwd): | |
160 | bye::1000:1000:Outlogger:/bin:echo Bye | |
161 | Logging in as "bye" with no password simply echoes Bye on the screen. | |
162 | This has applications for pppd/slip. | |
163 | ||
164 | Version 1.31a (28-Oct-94): | |
165 | Scott Telford provided a patch for simpleinit, so executing reboot | |
166 | from singleuser mode won't partially execute /etc/rc before | |
167 | the reboot. | |
168 | ||
169 | Version 1.30 (17-Sep-94): | |
2bb3aa36 | 170 | tobias@server.et-inf.fho-emden.de (Peter Tobias) has made a more |
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171 | advanced hostname command that understands some options such as |
172 | -f for FQDN etc. I'll not duplicate his work. Use his hostname | |
173 | package if you wish. | |
174 | ||
175 | svm@kozmix.xs4all.nl (Sander van Malssen) provided more features | |
2bb3aa36 | 176 | for the /etc/issue file in agetty. \U and \u now expand to the |
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177 | number of current users. |
178 | ||
179 | It is now possible to state the value of TERM on the agetty command | |
180 | line. This was also provided by Sander. | |
181 | ||
182 | This has been built under Linux 1.1.42 with gcc 2.5.8 and libc 4.5.26. | |
183 | ||
184 | Version 1.29 (18-Aug-94): | |
185 | Finally got around to making a real version after the numerous | |
186 | alpha versions of 1.28. Scott Telford <st@epcc.ed.ac.uk> provided | |
187 | a patch for write(1) to make it look more like BSD write. | |
188 | ||
189 | Fixed login so that the .hushlogin feature works even with real | |
190 | protective users mounted via NFS (ie. where root can't access | |
191 | the user's .hushlogin file). | |
192 | ||
193 | Cleaned up the code to make -Wall bearable. | |
194 | ||
195 | Version 1.28c (21-Jul-94): | |
196 | Rik Faith reminded me that agetty should use the syslog | |
197 | facility. It now does. | |
198 | ||
199 | Version 1.28b (30-May-94): | |
200 | On suggestion from Jeremy Fitzhardinge <jeremy@suite.sw.oz.au> | |
201 | I added -- as option delimiter on args passed from agetty to | |
202 | login. Fixes -froot hole for other login programs. The login | |
203 | program in this package never had that hole. | |
204 | ||
205 | Version 1.28a (16-May-94): | |
206 | bill@goshawk.lanl.gov provided a couple of patches, one fixing | |
207 | terminal setup in agetty, and reboot is now supposed to be | |
208 | in /sbin according to FSSTND. | |
209 | ||
210 | Version 1.27 (10-May-94): | |
211 | Changed login.c, so all bad login attempts are logged, and added | |
212 | usertty security feature. See about.usertty for an explanation. | |
2bb3aa36 | 213 | There's no longer a limit of 20 chars in the TERM environment |
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214 | variable. Suggested by Nicolai Langfeldt <janl@math.uio.no> |
215 | ||
216 | Added #ifdef HAVE_QUOTA around quota checks. Enable them if | |
217 | you have quota stuff in your libraries and kernel. | |
218 | Also re-enabled set/getpriority() calls as we now have them, | |
219 | and have had for a long time... | |
220 | ||
221 | Now wtmp is locked and unlocked around writes to avoid mangling. | |
222 | Due to Jaakko Hyv{tti <HYVATTI@cc.helsinki.fi>. | |
223 | ||
2bb3aa36 | 224 | Wrt. agetty: A \o in /etc/issue now inserts the domainname, as |
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225 | set by domainname(1). Sander van Malssen provided this. |
226 | This is being used under Linux 1.1.9 | |
227 | ||
228 | Beefed up the agetty.8 man-page to describe the /etc/issue | |
229 | options. Added man-pages for wall, cage, who. | |
230 | ||
231 | Version 1.26 alpha (25-Apr-94): | |
2bb3aa36 | 232 | Added patch from Bill Reynolds <bill@goshawk.lanl.gov> to |
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233 | simpleinit, so it will drop into single user if /etc/rc |
234 | fails, eg. from fsck. | |
235 | ||
236 | Version 1.25 (9-Feb-94): | |
237 | Agetty should now work with the Linux 0.99pl15a kernel. | |
238 | ECHOCTL and ECHOPRT are no longer set in the termios struct. | |
239 | Also made agetty accept both "tty baudrate" and "baudrate tty" | |
240 | arguments. | |
241 | ||
242 | Version 1.24 (23-Jan-94): changes since 1.22 | |
243 | Christian von Roques <roques@juliet.ka.sub.org> provided a patch | |
2bb3aa36 | 244 | that cleans up the handling of the -L option on agetty. |
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245 | Rik Faith <faith@cs.unc.edu> enhanced several man-pages... |
246 | ||
247 | Version 1.23 (11-Dec-93): changes since 1.21 | |
248 | Mitchum DSouza provided the hostid(1) code. It needs libc 4.4.4 or | |
249 | later and a Linux 0.99.14 kernel or later. It can set and print | |
2bb3aa36 | 250 | the world unique hostid of the machine. This may be used in |
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251 | connection with commercial software licenses. God forbid! |
252 | I added the -v option, and munged the code a bit, so don't blame | |
253 | Mitch if you don't like it. | |
254 | ||
255 | I made the "cage" program. Using this as a shell in the passwd | |
256 | file, enables one to let users log into a chroot'ed environment. | |
257 | For those that have modem logins and are concerned about security. | |
258 | Read the source for further info. | |
259 | ||
260 | "who am i" now works. | |
261 | ||
262 | The login program works with Yellow Pages (aka NIS) simply by | |
263 | linking with an appropriate library containing a proper version | |
264 | of getpwnam() and friends. | |
265 | ||
266 | Version 1.21 (30-Oct-93): changes since 1.20 | |
267 | In simpleinit.c: The boottime wtmp record is now written *after* | |
268 | /etc/rc is run, to put a correct timestamp on it. | |
269 | Daniel Thumim <dthumim@mit.edu> suggested this fix. | |
270 | ||
2bb3aa36 | 271 | The source and Makefile is prepared for optional installation of |
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272 | binaries in /sbin instead of /etc, and logfiles in /usr/adm instead |
273 | of /etc. See and change the Makefile to suit your preferences. | |
274 | Rik Faith and Stephen Tweedie inspired this change. | |
275 | ||
276 | Version 1.20 (30-Jul-93): changes since 1.17: | |
455fe9a0 | 277 | Versions 1.18 and 1.19 were never made publicly available. |
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278 | Agetty now supports a -L switch that makes it force the CLOCAL flag. |
279 | This is useful if you have a local terminal attached with a partly | |
280 | wired serial cable that does not pass on the Carrier Detect signal. | |
281 | ||
282 | There's a domainname program like the hostname program; contributed | |
283 | by Lars Wirzenius. | |
284 | ||
285 | Simpleinit will now write a REBOOT record to wtmp on boot up. Time- | |
286 | zone support is now optional in simpleinit. Both of these patches | |
287 | were made by Scott Telford <st@epcc.ed.ac.uk>. | |
288 | ||
289 | This is for Linux 0.99.11 or later. | |
290 | ||
291 | Version 1.17 (19-May-93): changes since 1.16: | |
292 | Login, simpleinit and write should now work with shadow passwords | |
293 | too. See the Makefile. Thanks to Anders Buch who let me have an | |
294 | account on his SLS based Linux box on the Internet, so I could test | |
295 | this. I should also thank jmorriso@rflab.ee.ubc.ca (John Paul Morrison) | |
296 | who sent me the shadow patch to login.c | |
297 | ||
298 | Version 1.16 (24-Apr-93): changes since 1.15a: | |
299 | Simpleinit now clears the utmp entry associated with the pid's that | |
300 | it reaps if there is one. A few are still using simpleinit and this | |
301 | was a popular demand. It also appends an entry to wtmp | |
302 | ||
303 | Version 1.15a (15-Mar-93): changes since 1.13a: | |
304 | junio@shadow.twinsun.com (Jun Hamano) sent me a one-line fix | |
305 | for occasional mangled issue-output from agetty. | |
306 | ||
307 | Version 1.13a (2-Mar-93): changes since 1.12a: | |
308 | With the new LILO (0.9), there are more than one possible arg | |
309 | to init, so Werner Almesberger <almesber@bernina.ethz.ch> | |
310 | suggested that a loop over argv[] was made in boot_single() in | |
311 | simpleinit.c | |
312 | ||
313 | Version 1.12a (24-Feb-93): changes since 1.11: | |
314 | This is for Linux 0.99.6 or later. Built with gcc 2.3.3 and libc4.2 | |
315 | jrs@world.std.com (Rick Sladkey) told me that the setenv("TZ",..) | |
316 | in login.c did more harm than good, so I commented it out. | |
317 | ||
318 | Version 1.11a (16-Feb-93): changes since 1.9a: | |
319 | This is for Linux 0.99.5 or later. | |
320 | Anthony Rumble <arumble@extro.ucc.su.OZ.AU> made me avare that | |
321 | the patches for vhangup() from Steven S. Dick didn't quite work, | |
322 | so I changed it. | |
323 | ||
324 | Linus Torvalds provided another patch relating to vhangup, since | |
325 | in newer Linuxen vhangup() doesn't really close all files, so we | |
326 | can't just open the tty's again. | |
327 | ||
328 | Version 1.9a (18-Jan-93): changes since 1.8a: | |
31fb9453 | 329 | Rick Faith sent me man-pages for most of the utilities in this |
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330 | package. They are now included. |
331 | ||
332 | Steven S. Dick <ssd@nevets.oau.org> sent me a patch for login.c | |
333 | so DTR won't drop during vhangup() on a modemline. | |
334 | ||
335 | This is completely untested!! I haven't even had the time to | |
336 | compile it yet. | |
337 | ||
338 | Version 1.8a (13-Dec-92): changes since 1.7: | |
339 | This is for Linux 0.98.6 or later. Compiles with gcc2.2.2d7 and libc4.1 | |
340 | ||
341 | Bettered write/wall after fix from I forget who. Now wall can have | |
342 | commandline args. | |
343 | ||
344 | Fixed bug in who.c | |
345 | ||
346 | Patched simpleinit.c with patch from Ed Carp, so it sets the timezone | |
347 | from /etc/TZ. Should probably by be /etc/timezone. | |
348 | ||
349 | Sander Van Malssen <sander@kozmix.hacktic.nl> provided a patch | |
350 | for getty, so it can understand certain escapecodes in /etc/issue. | |
351 | ||
352 | I hacked up a very simple substitute for a syslog() call, to try out | |
353 | the logging. If you have a real syslog() and syslogd then use that! | |
354 | ||
355 | The special vhangup.c file is out, it's in the official libc by now. | |
356 | (and even in the libc that I have :-) | |
357 | ||
358 | who, and write are now deprecated, get the better ones from one of | |
359 | the GNU packages, shellutils I think. | |
360 | ||
361 | Some people think that the simple init provided in this package is too | |
362 | spartan, if you think the same, then get the SYSV compatible init | |
363 | from Miquel van Smoorenburg <miquels@maestro.htsa.aha.nl> | |
364 | Simpleinit will probably be deprecated in the future. | |
365 | ||
366 | Version 1.7: 26-Oct-92 changes since 1.6: | |
367 | This is for Linux 0.97PL4 or later. | |
368 | ||
2bb3aa36 EM |
369 | Thanks to Werner Almesberger, init now has support for a |
370 | singleuser mode. | |
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371 | |
372 | Login now supports the -h <hostname> option, used in connection | |
373 | with TCP/IP. (rlogin/telnet) | |
374 | ||
375 | Getty writes an entry to /etc/wtmp when started, so last won't report | |
376 | "still logged in" for tty's that have not been logged into since | |
377 | the last user of that tty logged out. This patch was inspired by | |
378 | Mitchum DSouza. To gain the full benefit of this, get the newest | |
379 | last from the admutils-1.4.tar.Z package or later. | |
380 | ||
381 | Version 1.6 (29-Aug-92): changes since 1.5: | |
382 | This is for Linux 0.97P1+ or later. | |
2bb3aa36 | 383 | |
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384 | Login now uses the newly implemented vhangup() sys-call, to prevent |
385 | snooping on the tty. | |
386 | An alternative getpass() function is now provided with login, because | |
387 | I was told that the old one in libc didn't work with telnet and | |
388 | or rlogin. I don't have a network or a kernel with TCP/IP so I haven't | |
389 | tested the new one with telnet, but it is derived from BSD sources | |
390 | that are supposed to work with networking. | |
391 | ||
392 | Version 1.5 (12-Aug-92): changes since 1.4 | |
393 | This is for Linux 0.97 or later, and has been built with gcc2.2.2 | |
394 | ||
395 | This release just puts in a few bugfixes in login.c and simpleinit.c | |
396 | ||
397 | Version 1.4 (4-Jul-92): changes since 1.3: | |
398 | This is for Linux 0.96b, and has been built and tested with gcc 2.2.2. | |
399 | ||
400 | Init now handles the SIGINT signal. When init gets a SIGINT it will | |
401 | call /usr/bin/reboot and thereby gently reboot the machine. This | |
402 | makes sense because after Linux 0.96B-PL1 the key-combination | |
2bb3aa36 | 403 | Ctrl-Alt-Del may send a SIGINT to init instead of booting the |
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404 | machine the hard way without syncing or anything. |
405 | ||
406 | You may want to get the admutils-1.1 package which includes a program | |
407 | that will instruct the kernel to use the "gentle-reboot" procedure. | |
408 | ||
409 | Version 1.3 (14-Jun-92): changes since 1.2: | |
410 | This is for Linux 0.96A. | |
411 | ||
412 | The ioctl(TIOCSWINSZ) has been removed from login.c because it now | |
413 | works :-). | |
2bb3aa36 | 414 | |
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415 | login.c now supports a lastlog database. |
416 | ||
417 | Several programs and pieces of source that were included in the 1.2 | |
418 | package has been *removed* as they are incorporated into the new | |
419 | libc. Other omitted parts such as last(1) has been replaced by | |
420 | better versions, and can be found in the admutils package. | |
421 | ||
422 | Agetty is now called getty and will be placed in /etc. | |
423 | ||
424 | A few changes has been made to make it possible to compile the | |
425 | stuff with GCC 2.x. | |
426 | ||
427 | Version 1.2 (28-Feb-92): changes since 1.1: | |
428 | This is for Linux 0.12. | |
429 | ||
430 | A couple of problems with simpleinit.c has been solved, thanks to | |
431 | Humberto Zuazaga. So now init groks comments in /etc/inittab, and | |
432 | handles the HUP and TSTP signals properly. | |
433 | ||
434 | I added two small scripts to the distribution: users and mesg. | |
435 | ||
436 | TERM is now carried through from /etc/inittab all the way to the | |
437 | shell. Console tty's are special-cased, so the termcap entry in | |
438 | /etc/inittab is overridden by the setting given at boot-time. | |
439 | This requires a different patch to the kernel than that distributed | |
440 | with version 1.1 | |
441 | ||
2bb3aa36 | 442 | Login no more sends superfluous chars from a password to the |
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443 | shell. It also properly prints a NL after the password. |
444 | ||
445 | Agetty didn't set the erase character properly, it does now. | |
446 | ||
447 | A few extra defines has been added to utmp.h | |
448 | ||
449 | Several netters helped discover the bugs in 1.1. Thanks to them | |
450 | all. | |
451 | ||
452 | Version 1.1 (released 19-Feb-92): Changes since 1.0: | |
453 | A bug in simpleinit.c has been fixed, thanks to Pietro Castelli. | |
454 | The definition of the ut_line field has been changed to track the | |
455 | USG standard more closely, we now strip "/dev/" off the front. | |
456 | Thanks to: Douglas E. Quale and Stephen Gallimore. | |
457 | ||
458 | I have added a getlogin.c library routine, and a write(1) command. | |
459 | I removed the qpl-init stuff. If people want to use it, they should | |
460 | get it from the source. I don't want to hack on it anymore. | |
461 | ||
2bb3aa36 | 462 | A couple of people reported problems with getty having problems |
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463 | with serial terminals. That was correct. I borrowed a null-modem |
464 | from Tommy Thorn, and now the problems should be fixed. It seems | |
465 | that there is kept a lot of garbage in the serial buffers, flush | |
466 | them and it works like a charm. Getty does an ioctl(0, TCFLSH, 2) | |
467 | for this. | |
468 | ||
469 | The write.c code now doubles as code for a wall(1) program. | |
470 | ||
471 | Description of the various files: | |
472 | ||
473 | login.c The login program. This is a portation of BSD login, first | |
474 | to HP-UX 8.0 by Michael Glad (glad@daimi.aau.dk), and | |
475 | to Linux (initially to 0.12) by me. | |
476 | ||
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477 | agetty.c The getty program. From comp.sources.misc, by W.Z. Venema. |
478 | Hacked a bit by me. | |
479 | ||
6dbe3af9 | 480 | write.c A write(1) command, used to pass messages between users |
2bb3aa36 | 481 | at different terminals. This code doubles as code for |
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482 | a wall(1) command. Make a symlink: /usr/bin/wall -> |
483 | /usr/bin/write for this. | |
484 | ||
485 | mesg A tiny shellscript, so you can avoid that other people write | |
486 | to your shell. | |
487 | ||
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488 | pathnames.h: |
489 | Header. | |
490 | ||
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491 | Getty will print the contents of /etc/issue if it's present before asking |
492 | for username. Login will print the contents of /etc/motd after successful | |
493 | login. Login doesn't print /etc/motd, and doesn't check for mail if | |
494 | ~/.hushlogin is present and world readable. | |
495 | ||
496 | If /etc/nologin is present then login will print its contents and disallow | |
497 | any logins except root. | |
2bb3aa36 | 498 | It might be a good idea to have a "rm -f /etc/nologin" line in one's |
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499 | /etc/rc file. |
500 | ||
501 | If /etc/securetty is present it defines which tty's that root can login on. | |
502 | ||
503 | - Peter (poe@daimi.aau.dk) |