2 * Copyright (c) 1989, 1993
3 * The Regents of the University of California. All rights reserved.
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
8 * 1. Redistributions of source code must retain the above copyright
9 * notice, this list of conditions and the following disclaimer.
10 * 2. Redistributions in binary form must reproduce the above copyright
11 * notice, this list of conditions and the following disclaimer in the
12 * documentation and/or other materials provided with the distribution.
13 * 3. Neither the name of the University nor the names of its contributors
14 * may be used to endorse or promote products derived from this software
15 * without specific prior written permission.
17 * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
29 * @(#)sys_term.c 8.4+1 (Berkeley) 5/30/95
30 * $FreeBSD: src/crypto/telnet/telnetd/sys_term.c,v 1.7.2.5 2002/06/17 02:48:02 jmallett Exp $
33 #include <sys/types.h>
40 #include "pathnames.h"
43 #include <libtelnet/auth.h>
44 extern int auth_level;
47 int cleanopen(char *);
51 extern char **environ;
53 #define SCPYN(a, b) (void) strncpy(a, b, sizeof(a))
54 #define SCMPN(a, b) strncmp(a, b, sizeof(a))
81 # define cfsetospeed(tp, val) (tp)->sg.sg_ospeed = (val)
82 # define cfsetispeed(tp, val) (tp)->sg.sg_ispeed = (val)
83 # define cfgetospeed(tp) (tp)->sg.sg_ospeed
84 # define cfgetispeed(tp) (tp)->sg.sg_ispeed
85 #else /* USE_TERMIO */
88 # define TCSANOW TCSETS
89 # define TCSADRAIN TCSETSW
90 # define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t)
93 # define TCSANOW TCSETA
94 # define TCSADRAIN TCSETAW
95 # define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t)
97 # define TCSANOW TIOCSETA
98 # define TCSADRAIN TIOCSETAW
99 # define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t)
102 # define tcsetattr(f, a, t) ioctl(f, a, t)
103 # define cfsetospeed(tp, val) (tp)->c_cflag &= ~CBAUD; \
104 (tp)->c_cflag |= (val)
105 # define cfgetospeed(tp) ((tp)->c_cflag & CBAUD)
107 # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CIBAUD; \
108 (tp)->c_cflag |= ((val)<<IBSHIFT)
109 # define cfgetispeed(tp) (((tp)->c_cflag & CIBAUD)>>IBSHIFT)
111 # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CBAUD; \
112 (tp)->c_cflag |= (val)
113 # define cfgetispeed(tp) ((tp)->c_cflag & CBAUD)
115 # endif /* TCSANOW */
116 struct termios termbuf, termbuf2; /* pty control structure */
117 #endif /* USE_TERMIO */
119 int cleanopen(char *);
120 void scrub_env(void);
121 static char **addarg(char **, const char *);
128 * These three routines are used to get and set the "termbuf" structure
129 * to and from the kernel. init_termbuf() gets the current settings.
130 * copy_termbuf() hands in a new "termbuf" to write to the kernel, and
131 * set_termbuf() writes the structure into the kernel.
138 (void) ioctl(pty, TIOCGETP, (char *)&termbuf.sg);
139 (void) ioctl(pty, TIOCGETC, (char *)&termbuf.tc);
140 (void) ioctl(pty, TIOCGLTC, (char *)&termbuf.ltc);
142 (void) ioctl(pty, TIOCGSTATE, (char *)&termbuf.state);
145 (void) tcgetattr(pty, &termbuf);
150 #if defined(LINEMODE) && defined(TIOCPKT_IOCTL)
152 copy_termbuf(char *cp, size_t len)
154 if (len > sizeof(termbuf))
155 len = sizeof(termbuf);
156 memmove((char *)&termbuf, cp, len);
159 #endif /* defined(LINEMODE) && defined(TIOCPKT_IOCTL) */
165 * Only make the necessary changes.
168 if (memcmp((char *)&termbuf.sg, (char *)&termbuf2.sg,
170 (void) ioctl(pty, TIOCSETN, (char *)&termbuf.sg);
171 if (memcmp((char *)&termbuf.tc, (char *)&termbuf2.tc,
173 (void) ioctl(pty, TIOCSETC, (char *)&termbuf.tc);
174 if (memcmp((char *)&termbuf.ltc, (char *)&termbuf2.ltc,
175 sizeof(termbuf.ltc)))
176 (void) ioctl(pty, TIOCSLTC, (char *)&termbuf.ltc);
177 if (termbuf.lflags != termbuf2.lflags)
178 (void) ioctl(pty, TIOCLSET, (char *)&termbuf.lflags);
179 #else /* USE_TERMIO */
180 if (memcmp((char *)&termbuf, (char *)&termbuf2, sizeof(termbuf)))
181 (void) tcsetattr(pty, TCSANOW, &termbuf);
182 #endif /* USE_TERMIO */
187 * spcset(func, valp, valpp)
189 * This function takes various special characters (func), and
190 * sets *valp to the current value of that character, and
191 * *valpp to point to where in the "termbuf" structure that
194 * It returns the SLC_ level of support for this function.
199 spcset(int func, cc_t *valp, cc_t **valpp)
203 *valp = termbuf.tc.t_eofc;
204 *valpp = (cc_t *)&termbuf.tc.t_eofc;
205 return(SLC_VARIABLE);
207 *valp = termbuf.sg.sg_erase;
208 *valpp = (cc_t *)&termbuf.sg.sg_erase;
209 return(SLC_VARIABLE);
211 *valp = termbuf.sg.sg_kill;
212 *valpp = (cc_t *)&termbuf.sg.sg_kill;
213 return(SLC_VARIABLE);
215 *valp = termbuf.tc.t_intrc;
216 *valpp = (cc_t *)&termbuf.tc.t_intrc;
217 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
219 *valp = termbuf.tc.t_quitc;
220 *valpp = (cc_t *)&termbuf.tc.t_quitc;
221 return(SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
223 *valp = termbuf.tc.t_startc;
224 *valpp = (cc_t *)&termbuf.tc.t_startc;
225 return(SLC_VARIABLE);
227 *valp = termbuf.tc.t_stopc;
228 *valpp = (cc_t *)&termbuf.tc.t_stopc;
229 return(SLC_VARIABLE);
231 *valp = termbuf.ltc.t_flushc;
232 *valpp = (cc_t *)&termbuf.ltc.t_flushc;
233 return(SLC_VARIABLE);
235 *valp = termbuf.ltc.t_suspc;
236 *valpp = (cc_t *)&termbuf.ltc.t_suspc;
237 return(SLC_VARIABLE);
239 *valp = termbuf.ltc.t_werasc;
240 *valpp = (cc_t *)&termbuf.ltc.t_werasc;
241 return(SLC_VARIABLE);
243 *valp = termbuf.ltc.t_rprntc;
244 *valpp = (cc_t *)&termbuf.ltc.t_rprntc;
245 return(SLC_VARIABLE);
247 *valp = termbuf.ltc.t_lnextc;
248 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
249 return(SLC_VARIABLE);
251 *valp = termbuf.tc.t_brkc;
252 *valpp = (cc_t *)&termbuf.ltc.t_lnextc;
253 return(SLC_VARIABLE);
264 return(SLC_NOSUPPORT);
268 #else /* USE_TERMIO */
271 #define setval(a, b) *valp = termbuf.c_cc[a]; \
272 *valpp = &termbuf.c_cc[a]; \
274 #define defval(a) *valp = ((cc_t)a); *valpp = NULL; return(SLC_DEFAULT);
277 spcset(int func, cc_t *valp, cc_t **valpp)
281 setval(VEOF, SLC_VARIABLE);
283 setval(VERASE, SLC_VARIABLE);
285 setval(VKILL, SLC_VARIABLE);
287 setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
289 setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT);
292 setval(VSTART, SLC_VARIABLE);
298 setval(VSTOP, SLC_VARIABLE);
304 setval(VWERASE, SLC_VARIABLE);
310 setval(VREPRINT, SLC_VARIABLE);
316 setval(VLNEXT, SLC_VARIABLE);
321 #if !defined(VDISCARD) && defined(VFLUSHO)
322 # define VDISCARD VFLUSHO
325 setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT);
331 setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN);
337 setval(VEOL, SLC_VARIABLE);
341 setval(VEOL2, SLC_VARIABLE);
345 setval(VSTATUS, SLC_VARIABLE);
358 return(SLC_NOSUPPORT);
361 #endif /* USE_TERMIO */
366 * Allocate a pty. As a side effect, the external character
367 * array "line" contains the name of the slave side.
369 * Returns the file descriptor of the opened pty.
371 char alpha[] = "0123456789abcdefghijklmnopqrstuv";
375 getpty(int *ptynum __unused)
382 (void) strcpy(line, _PATH_DEV);
383 (void) strcat(line, "ptyXX");
387 for (cp = "pqrsPQRS"; *cp; cp++) {
393 * This stat() check is just to keep us from
394 * looping through all 256 combinations if there
395 * aren't that many ptys available.
397 if (stat(line, &stb) < 0)
399 for (i = 0; i < 32; i++) {
415 * tty_flowmode() Find out if flow control is enabled or disabled.
416 * tty_linemode() Find out if linemode (external processing) is enabled.
417 * tty_setlinemod(on) Turn on/off linemode.
418 * tty_isecho() Find out if echoing is turned on.
419 * tty_setecho(on) Enable/disable character echoing.
420 * tty_israw() Find out if terminal is in RAW mode.
421 * tty_binaryin(on) Turn on/off BINARY on input.
422 * tty_binaryout(on) Turn on/off BINARY on output.
423 * tty_isediting() Find out if line editing is enabled.
424 * tty_istrapsig() Find out if signal trapping is enabled.
425 * tty_setedit(on) Turn on/off line editing.
426 * tty_setsig(on) Turn on/off signal trapping.
427 * tty_issofttab() Find out if tab expansion is enabled.
428 * tty_setsofttab(on) Turn on/off soft tab expansion.
429 * tty_islitecho() Find out if typed control chars are echoed literally
430 * tty_setlitecho() Turn on/off literal echo of control chars
431 * tty_tspeed(val) Set transmit speed to val.
432 * tty_rspeed(val) Set receive speed to val.
440 return(termbuf.state & TS_EXTPROC);
442 return(termbuf.c_lflag & EXTPROC);
447 tty_setlinemode(int on)
451 (void) ioctl(pty, TIOCEXT, (char *)&on);
456 termbuf.c_lflag |= EXTPROC;
458 termbuf.c_lflag &= ~EXTPROC;
462 #endif /* LINEMODE */
468 return (termbuf.sg.sg_flags & ECHO);
470 return (termbuf.c_lflag & ECHO);
478 return(((termbuf.tc.t_startc) > 0 && (termbuf.tc.t_stopc) > 0) ? 1 : 0);
480 return((termbuf.c_iflag & IXON) ? 1 : 0);
489 return((termbuf.lflags & DECCTQ) ? 0 : 1);
494 return((termbuf.c_iflag & IXANY) ? 1 : 0);
503 termbuf.sg.sg_flags |= ECHO|CRMOD;
505 termbuf.sg.sg_flags &= ~(ECHO|CRMOD);
508 termbuf.c_lflag |= ECHO;
510 termbuf.c_lflag &= ~ECHO;
518 return(termbuf.sg.sg_flags & RAW);
520 return(!(termbuf.c_lflag & ICANON));
524 #ifdef AUTHENTICATION
525 #if defined(NO_LOGIN_F) && defined(LOGIN_R)
531 termbuf.sg.sg_flags |= RAW;
533 termbuf.sg.sg_flags &= ~RAW;
536 termbuf.c_lflag &= ~ICANON;
538 termbuf.c_lflag |= ICANON;
542 #endif /* AUTHENTICATION */
549 termbuf.lflags |= LPASS8;
551 termbuf.lflags &= ~LPASS8;
554 termbuf.c_iflag &= ~ISTRIP;
556 termbuf.c_iflag |= ISTRIP;
562 tty_binaryout(int on)
566 termbuf.lflags |= LLITOUT;
568 termbuf.lflags &= ~LLITOUT;
571 termbuf.c_cflag &= ~(CSIZE|PARENB);
572 termbuf.c_cflag |= CS8;
573 termbuf.c_oflag &= ~OPOST;
575 termbuf.c_cflag &= ~CSIZE;
576 termbuf.c_cflag |= CS7|PARENB;
577 termbuf.c_oflag |= OPOST;
586 return(termbuf.lflags & LPASS8);
588 return(!(termbuf.c_iflag & ISTRIP));
593 tty_isbinaryout(void)
596 return(termbuf.lflags & LLITOUT);
598 return(!(termbuf.c_oflag&OPOST));
607 return(!(termbuf.sg.sg_flags & (CBREAK|RAW)));
609 return(termbuf.c_lflag & ICANON);
617 return(!(termbuf.sg.sg_flags&RAW));
619 return(termbuf.c_lflag & ISIG);
628 termbuf.sg.sg_flags &= ~CBREAK;
630 termbuf.sg.sg_flags |= CBREAK;
633 termbuf.c_lflag |= ICANON;
635 termbuf.c_lflag &= ~ICANON;
647 termbuf.c_lflag |= ISIG;
649 termbuf.c_lflag &= ~ISIG;
652 #endif /* LINEMODE */
658 return (termbuf.sg.sg_flags & XTABS);
661 return (termbuf.c_oflag & OXTABS);
664 return ((termbuf.c_oflag & TABDLY) == TAB3);
670 tty_setsofttab(int on)
674 termbuf.sg.sg_flags |= XTABS;
676 termbuf.sg.sg_flags &= ~XTABS;
680 termbuf.c_oflag |= OXTABS;
683 termbuf.c_oflag &= ~TABDLY;
684 termbuf.c_oflag |= TAB3;
688 termbuf.c_oflag &= ~OXTABS;
691 termbuf.c_oflag &= ~TABDLY;
692 termbuf.c_oflag |= TAB0;
702 return (!(termbuf.lflags & LCTLECH));
705 return (!(termbuf.c_lflag & ECHOCTL));
708 return (!(termbuf.c_lflag & TCTLECH));
710 # if !defined(ECHOCTL) && !defined(TCTLECH)
711 return (0); /* assumes ctl chars are echoed '^x' */
717 tty_setlitecho(int on)
721 termbuf.lflags &= ~LCTLECH;
723 termbuf.lflags |= LCTLECH;
727 termbuf.c_lflag &= ~ECHOCTL;
729 termbuf.c_lflag |= ECHOCTL;
733 termbuf.c_lflag &= ~TCTLECH;
735 termbuf.c_lflag |= TCTLECH;
744 return (termbuf.sg.sg_flags & CRMOD);
746 return (termbuf.c_iflag & ICRNL);
751 * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD).
760 * A table of available terminal speeds
766 { 0, B0 }, { 50, B50 }, { 75, B75 },
767 { 110, B110 }, { 134, B134 }, { 150, B150 },
768 { 200, B200 }, { 300, B300 }, { 600, B600 },
769 { 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 },
798 #endif /* DECODE_BAUD */
804 struct termspeeds *tp;
806 for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
808 if (tp->speed == -1) /* back up to last valid value */
810 cfsetospeed(&termbuf, tp->value);
811 #else /* DECODE_BAUD */
812 cfsetospeed(&termbuf, val);
813 #endif /* DECODE_BAUD */
820 struct termspeeds *tp;
822 for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++)
824 if (tp->speed == -1) /* back up to last valid value */
826 cfsetispeed(&termbuf, tp->value);
827 #else /* DECODE_BAUD */
828 cfsetispeed(&termbuf, val);
829 #endif /* DECODE_BAUD */
835 * Open the slave side of the pty, and do any initialization
849 extern int def_row, def_col;
851 extern int def_tspeed, def_rspeed;
853 * Opening the slave side may cause initilization of the
854 * kernel tty structure. We need remember the state of
855 * if linemode was turned on
856 * terminal window size
859 * so that we can re-set them if we need to.
862 waslm = tty_linemode();
864 erase = termbuf.c_cc[VERASE];
867 * Make sure that we don't have a controlling tty, and
868 * that we are the session (process group) leader.
871 t = open(_PATH_TTY, O_RDWR);
873 (void) ioctl(t, TIOCNOTTY, NULL);
880 fatalperror(net, line);
884 * set up the tty modes as we like them to be.
888 if (def_row || def_col) {
889 memset((char *)&ws, 0, sizeof(ws));
892 (void)ioctl(t, TIOCSWINSZ, (char *)&ws);
897 * Settings for sgtty based systems
900 termbuf.sg.sg_flags |= CRMOD|ANYP|ECHO|XTABS;
901 # endif /* USE_TERMIO */
904 * Settings for all other termios/termio based
905 * systems, other than 4.4BSD. In 4.4BSD the
906 * kernel does the initial terminal setup.
908 tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600);
909 tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600);
911 termbuf.c_cc[VERASE] = erase;
915 # endif /* LINEMODE */
918 * Set the tty modes, and make this our controlling tty.
921 if (login_tty(t) == -1)
922 fatalperror(net, "login_tty");
925 #ifdef AUTHENTICATION
926 #if defined(NO_LOGIN_F) && defined(LOGIN_R)
928 * Leave the pty open so that we can write out the rlogin
929 * protocol for /bin/login, if the authentication works.
937 #endif /* AUTHENTICATION */
944 * Open the specified slave side of the pty,
945 * making sure that we have a clean tty.
953 * Make sure that other people can't open the
954 * slave side of the connection.
956 (void) chown(li, 0, 0);
957 (void) chmod(li, 0600);
961 t = open(line, O_RDWR|O_NOCTTY);
972 * Given a hostname, do whatever
973 * is necessary to startup the login process on the slave side of the pty.
978 startslave(char *host, int autologin, char *autoname)
982 #ifdef AUTHENTICATION
983 if (!autoname || !autoname[0])
986 if (autologin < auth_level) {
987 fatalmsg(net, "Authorization failed");
993 if ((i = fork()) < 0)
994 fatalperror(net, "fork");
998 start_login(host, autologin, autoname);
1009 if ((*envp = getenv("TZ")))
1019 * Assuming that we are now running as a child processes, this
1020 * function will turn us into the login process.
1023 #ifndef AUTHENTICATION
1024 #define undef1 __unused
1030 start_login(char *host undef1, int autologin undef1, char *name undef1)
1037 * -h : pass on name of host.
1038 * WARNING: -h is accepted by login if and only if
1040 * -p : don't clobber the environment (so terminal type stays set).
1042 * -f : force this login, he has already been authenticated
1044 argv = addarg(0, "login");
1046 #if !defined(NO_LOGIN_H)
1047 #ifdef AUTHENTICATION
1048 # if defined(NO_LOGIN_F) && defined(LOGIN_R)
1050 * Don't add the "-h host" option if we are going
1051 * to be adding the "-r host" option down below...
1053 if ((auth_level < 0) || (autologin != AUTH_VALID))
1056 argv = addarg(argv, "-h");
1057 argv = addarg(argv, host);
1059 #endif /* AUTHENTICATION */
1061 #if !defined(NO_LOGIN_P)
1062 argv = addarg(argv, "-p");
1066 * Set the environment variable "LINEMODE" to either
1067 * "real" or "kludge" if we are operating in either
1068 * real or kludge linemode.
1070 if (lmodetype == REAL_LINEMODE) {
1071 if (setenv("LINEMODE", "real", 1) == -1)
1072 syslog(LOG_ERR, "setenv: cannot set LINEMODE=real: %m");
1074 # ifdef KLUDGELINEMODE
1075 else if (lmodetype == KLUDGE_LINEMODE || lmodetype == KLUDGE_OK) {
1076 if (setenv("LINEMODE", "kludge", 1) == -1)
1077 syslog(LOG_ERR, "setenv: cannot set LINEMODE=kludge: %m");
1083 * Are we working as the bftp daemon? If so, then ask login
1084 * to start bftp instead of shell.
1087 argv = addarg(argv, "-e");
1088 argv = addarg(argv, BFTPPATH);
1091 #ifdef AUTHENTICATION
1092 if (auth_level >= 0 && autologin == AUTH_VALID) {
1093 # if !defined(NO_LOGIN_F)
1094 argv = addarg(argv, "-f");
1095 argv = addarg(argv, "--");
1096 argv = addarg(argv, name);
1098 # if defined(LOGIN_R)
1100 * We don't have support for "login -f", but we
1101 * can fool /bin/login into thinking that we are
1102 * rlogind, and allow us to log in without a
1103 * password. The rlogin protocol expects
1104 * local-user\0remote-user\0term/speed\0
1110 int isecho, israw, xpty, len;
1111 extern int def_rspeed;
1114 * Tell login that we are coming from "localhost".
1115 * If we passed in the real host name, then the
1116 * user would have to allow .rhost access from
1117 * every machine that they want authenticated
1118 * access to work from, which sort of defeats
1119 * the purpose of an authenticated login...
1120 * So, we tell login that the session is coming
1121 * from "localhost", and the user will only have
1122 * to have "localhost" in their .rhost file.
1124 # define LOGIN_HOST "localhost"
1126 argv = addarg(argv, "-r");
1127 argv = addarg(argv, LOGIN_HOST);
1132 isecho = tty_isecho();
1133 israw = tty_israw();
1134 if (isecho || !israw) {
1135 tty_setecho(0); /* Turn off echo */
1136 tty_setraw(1); /* Turn on raw */
1139 len = strlen(name)+1;
1140 write(xpty, name, len);
1141 write(xpty, name, len);
1142 snprintf(speed, sizeof(speed),
1143 "%s/%d", (cp = getenv("TERM")) ? cp : "",
1144 (def_rspeed > 0) ? def_rspeed : 9600);
1145 len = strlen(speed)+1;
1146 write(xpty, speed, len);
1148 if (isecho || !israw) {
1150 tty_setecho(isecho);
1155 * Write a newline to ensure
1156 * that login will be able to
1159 write(xpty, "\n", 1);
1165 argv = addarg(argv, "--");
1166 argv = addarg(argv, name);
1171 if (getenv("USER")) {
1172 argv = addarg(argv, "--");
1173 argv = addarg(argv, getenv("USER"));
1174 #if defined(LOGIN_ARGS) && defined(NO_LOGIN_P)
1177 for (cpp = environ; *cpp; cpp++)
1178 argv = addarg(argv, *cpp);
1182 * Assume that login will set the USER variable
1183 * correctly. For SysV systems, this means that
1184 * USER will no longer be set, just LOGNAME by
1185 * login. (The problem is that if the auto-login
1186 * fails, and the user then specifies a different
1187 * account name, he can get logged in with both
1188 * LOGNAME and USER in his environment, but the
1189 * USER value will be wrong.
1193 #ifdef AUTHENTICATION
1194 #if defined(NO_LOGIN_F) && defined(LOGIN_R)
1198 #endif /* AUTHENTICATION */
1201 if (altlogin == NULL) {
1202 altlogin = _PATH_LOGIN;
1204 execv(altlogin, argv);
1206 syslog(LOG_ERR, "%s: %m", altlogin);
1207 fatalperror(net, altlogin);
1212 addarg(char **argv, const char *val)
1218 * 10 entries, a leading length, and a null
1220 argv = (char **)malloc(sizeof(*argv) * 12);
1223 *argv++ = (char *)10;
1226 for (cpp = argv; *cpp; cpp++)
1228 if (cpp == &argv[(long)argv[-1]]) {
1230 *argv = (char *)((long)(*argv) + 10);
1231 argv = (char **)realloc(argv, sizeof(*argv)*((long)(*argv) + 2));
1235 cpp = &argv[(long)argv[-1] - 10];
1237 *cpp++ = strdup(val);
1245 * We only accept the environment variables listed below.
1250 static const char *rej[] = {
1255 static const char *acc[] = {
1256 "XAUTH=", "XAUTHORITY=", "DISPLAY=",
1268 char ** new_environ;
1271 /* Allocate space for scrubbed environment. */
1272 for (count = 1, cpp = environ; *cpp; count++, cpp++)
1274 if ((new_environ = malloc(count * sizeof(char *))) == NULL) {
1279 for (cpp2 = new_environ, cpp = environ; *cpp; cpp++) {
1282 for(p = rej; *p; p++)
1283 if(strncmp(*cpp, *p, strlen(*p)) == 0) {
1290 for(p = acc; *p; p++)
1291 if(strncmp(*cpp, *p, strlen(*p)) == 0)
1294 if ((*cpp2++ = strdup(*cpp)) == NULL) {
1295 environ = new_environ;
1301 environ = new_environ;
1307 * This is the routine to call when we are all through, to
1308 * clean up anything that needs to be cleaned up.
1312 cleanup(int sig __unused)
1317 p = line + sizeof(_PATH_DEV) - 1;
1319 * Block all signals before clearing the utmpx entry. We don't want to
1320 * be called again after calling logout() and then not add the wtmpx
1321 * entry because of not finding the corresponding entry in utmpx.
1324 sigprocmask(SIG_SETMASK, &mask, NULL);
1325 if (logoutx(p, 0, DEAD_PROCESS))
1326 logwtmpx(p, "", "", 0, DEAD_PROCESS);
1327 (void)chmod(line, 0666);
1328 (void)chown(line, 0, 0);
1330 (void)chmod(line, 0666);
1331 (void)chown(line, 0, 0);
1332 (void) shutdown(net, SHUT_RDWR);