/* * Copyright (c) 1989, 1993 * The Regents of the University of California. All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * 3. All advertising materials mentioning features or use of this software * must display the following acknowledgement: * This product includes software developed by the University of * California, Berkeley and its contributors. * 4. Neither the name of the University nor the names of its contributors * may be used to endorse or promote products derived from this software * without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include "telnetd.h" RCSID("$Id: sys_term.c,v 1.104 2001/09/17 02:09:04 assar Exp $"); #if defined(_CRAY) || (defined(__hpux) && !defined(HAVE_UTMPX_H)) # define PARENT_DOES_UTMP #endif #ifdef HAVE_UTMP_H #include #endif #ifdef HAVE_UTMPX_H #include #endif #ifdef HAVE_UTMPX_H struct utmpx wtmp; #elif defined(HAVE_UTMP_H) struct utmp wtmp; #endif /* HAVE_UTMPX_H */ #ifdef HAVE_STRUCT_UTMP_UT_HOST int utmp_len = sizeof(wtmp.ut_host); #else int utmp_len = MaxHostNameLen; #endif #ifndef UTMP_FILE #ifdef _PATH_UTMP #define UTMP_FILE _PATH_UTMP #else #define UTMP_FILE "/etc/utmp" #endif #endif #if !defined(WTMP_FILE) && defined(_PATH_WTMP) #define WTMP_FILE _PATH_WTMP #endif #ifndef PARENT_DOES_UTMP #ifdef WTMP_FILE char wtmpf[] = WTMP_FILE; #else char wtmpf[] = "/usr/adm/wtmp"; #endif char utmpf[] = UTMP_FILE; #else /* PARENT_DOES_UTMP */ #ifdef WTMP_FILE char wtmpf[] = WTMP_FILE; #else char wtmpf[] = "/etc/wtmp"; #endif #endif /* PARENT_DOES_UTMP */ #ifdef HAVE_TMPDIR_H #include #endif /* CRAY */ #ifdef STREAMSPTY #ifdef HAVE_SAC_H #include #endif #ifdef HAVE_SYS_STROPTS_H #include #endif #endif /* STREAMSPTY */ #undef NOERROR #ifdef HAVE_SYS_STREAM_H #ifdef HAVE_SYS_UIO_H #include #endif #ifdef __hpux #undef SE #endif #include #endif #if !(defined(__sgi) || defined(__linux) || defined(_AIX)) && defined(HAVE_SYS_TTY) #include #endif #ifdef t_erase #undef t_erase #undef t_kill #undef t_intrc #undef t_quitc #undef t_startc #undef t_stopc #undef t_eofc #undef t_brkc #undef t_suspc #undef t_dsuspc #undef t_rprntc #undef t_flushc #undef t_werasc #undef t_lnextc #endif #ifdef HAVE_TERMIOS_H #include #else #ifdef HAVE_TERMIO_H #include #endif #endif #ifdef HAVE_UTIL_H #include #endif #ifdef HAVE_LIBUTIL_H #include #endif # ifndef TCSANOW # ifdef TCSETS # define TCSANOW TCSETS # define TCSADRAIN TCSETSW # define tcgetattr(f, t) ioctl(f, TCGETS, (char *)t) # else # ifdef TCSETA # define TCSANOW TCSETA # define TCSADRAIN TCSETAW # define tcgetattr(f, t) ioctl(f, TCGETA, (char *)t) # else # define TCSANOW TIOCSETA # define TCSADRAIN TIOCSETAW # define tcgetattr(f, t) ioctl(f, TIOCGETA, (char *)t) # endif # endif # define tcsetattr(f, a, t) ioctl(f, a, t) # define cfsetospeed(tp, val) (tp)->c_cflag &= ~CBAUD; \ (tp)->c_cflag |= (val) # define cfgetospeed(tp) ((tp)->c_cflag & CBAUD) # ifdef CIBAUD # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CIBAUD; \ (tp)->c_cflag |= ((val)<c_cflag & CIBAUD)>>IBSHIFT) # else # define cfsetispeed(tp, val) (tp)->c_cflag &= ~CBAUD; \ (tp)->c_cflag |= (val) # define cfgetispeed(tp) ((tp)->c_cflag & CBAUD) # endif # endif /* TCSANOW */ struct termios termbuf, termbuf2; /* pty control structure */ # ifdef STREAMSPTY static int ttyfd = -1; int really_stream = 0; # endif const char *new_login = _PATH_LOGIN; /* * init_termbuf() * copy_termbuf(cp) * set_termbuf() * * These three routines are used to get and set the "termbuf" structure * to and from the kernel. init_termbuf() gets the current settings. * copy_termbuf() hands in a new "termbuf" to write to the kernel, and * set_termbuf() writes the structure into the kernel. */ void init_termbuf(void) { # ifdef STREAMSPTY if (really_stream) tcgetattr(ttyfd, &termbuf); else # endif tcgetattr(ourpty, &termbuf); termbuf2 = termbuf; } void set_termbuf(void) { /* * Only make the necessary changes. */ if (memcmp(&termbuf, &termbuf2, sizeof(termbuf))) # ifdef STREAMSPTY if (really_stream) tcsetattr(ttyfd, TCSANOW, &termbuf); else # endif tcsetattr(ourpty, TCSANOW, &termbuf); } /* * spcset(func, valp, valpp) * * This function takes various special characters (func), and * sets *valp to the current value of that character, and * *valpp to point to where in the "termbuf" structure that * value is kept. * * It returns the SLC_ level of support for this function. */ int spcset(int func, cc_t *valp, cc_t **valpp) { #define setval(a, b) *valp = termbuf.c_cc[a]; \ *valpp = &termbuf.c_cc[a]; \ return(b); #define defval(a) *valp = ((cc_t)a); *valpp = (cc_t *)0; return(SLC_DEFAULT); switch(func) { case SLC_EOF: setval(VEOF, SLC_VARIABLE); case SLC_EC: setval(VERASE, SLC_VARIABLE); case SLC_EL: setval(VKILL, SLC_VARIABLE); case SLC_IP: setval(VINTR, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); case SLC_ABORT: setval(VQUIT, SLC_VARIABLE|SLC_FLUSHIN|SLC_FLUSHOUT); case SLC_XON: #ifdef VSTART setval(VSTART, SLC_VARIABLE); #else defval(0x13); #endif case SLC_XOFF: #ifdef VSTOP setval(VSTOP, SLC_VARIABLE); #else defval(0x11); #endif case SLC_EW: #ifdef VWERASE setval(VWERASE, SLC_VARIABLE); #else defval(0); #endif case SLC_RP: #ifdef VREPRINT setval(VREPRINT, SLC_VARIABLE); #else defval(0); #endif case SLC_LNEXT: #ifdef VLNEXT setval(VLNEXT, SLC_VARIABLE); #else defval(0); #endif case SLC_AO: #if !defined(VDISCARD) && defined(VFLUSHO) # define VDISCARD VFLUSHO #endif #ifdef VDISCARD setval(VDISCARD, SLC_VARIABLE|SLC_FLUSHOUT); #else defval(0); #endif case SLC_SUSP: #ifdef VSUSP setval(VSUSP, SLC_VARIABLE|SLC_FLUSHIN); #else defval(0); #endif #ifdef VEOL case SLC_FORW1: setval(VEOL, SLC_VARIABLE); #endif #ifdef VEOL2 case SLC_FORW2: setval(VEOL2, SLC_VARIABLE); #endif case SLC_AYT: #ifdef VSTATUS setval(VSTATUS, SLC_VARIABLE); #else defval(0); #endif case SLC_BRK: case SLC_SYNCH: case SLC_EOR: defval(0); default: *valp = 0; *valpp = 0; return(SLC_NOSUPPORT); } } #ifdef _CRAY /* * getnpty() * * Return the number of pty's configured into the system. */ int getnpty() { #ifdef _SC_CRAY_NPTY int numptys; if ((numptys = sysconf(_SC_CRAY_NPTY)) != -1) return numptys; else #endif /* _SC_CRAY_NPTY */ return 128; } #endif /* CRAY */ /* * getpty() * * Allocate a pty. As a side effect, the external character * array "line" contains the name of the slave side. * * Returns the file descriptor of the opened pty. */ static char Xline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; char *line = Xline; #ifdef _CRAY char myline[] = "\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0\0"; #endif /* CRAY */ #if !defined(HAVE_PTSNAME) && defined(STREAMSPTY) static char *ptsname(int fd) { #ifdef HAVE_TTYNAME return ttyname(fd); #else return NULL; #endif } #endif int getpty(int *ptynum) { #ifdef __osf__ /* XXX */ int master; int slave; if(openpty(&master, &slave, line, 0, 0) == 0){ close(slave); return master; } return -1; #else #ifdef HAVE__GETPTY int master, slave; char *p; p = _getpty(&master, O_RDWR, 0600, 1); if(p == NULL) return -1; strlcpy(line, p, sizeof(Xline)); return master; #else int p; char *cp, *p1, *p2; int i; #if SunOS == 40 int dummy; #endif #if __linux int master; int slave; if(openpty(&master, &slave, line, 0, 0) == 0){ close(slave); return master; } #else #ifdef STREAMSPTY char *clone[] = { "/dev/ptc", "/dev/ptmx", "/dev/ptm", "/dev/ptym/clone", 0 }; char **q; for(q=clone; *q; q++){ p=open(*q, O_RDWR); if(p >= 0){ #ifdef HAVE_GRANTPT grantpt(p); #endif #ifdef HAVE_UNLOCKPT unlockpt(p); #endif strlcpy(line, ptsname(p), sizeof(Xline)); really_stream = 1; return p; } } #endif /* STREAMSPTY */ #ifndef _CRAY #ifndef __hpux snprintf(line, sizeof(Xline), "/dev/ptyXX"); p1 = &line[8]; p2 = &line[9]; #else snprintf(line, sizeof(Xline), "/dev/ptym/ptyXX"); p1 = &line[13]; p2 = &line[14]; #endif for (cp = "pqrstuvwxyzPQRST"; *cp; cp++) { struct stat stb; *p1 = *cp; *p2 = '0'; /* * This stat() check is just to keep us from * looping through all 256 combinations if there * aren't that many ptys available. */ if (stat(line, &stb) < 0) break; for (i = 0; i < 16; i++) { *p2 = "0123456789abcdef"[i]; p = open(line, O_RDWR); if (p > 0) { #ifndef __hpux line[5] = 't'; #else for (p1 = &line[8]; *p1; p1++) *p1 = *(p1+1); line[9] = 't'; #endif chown(line, 0, 0); chmod(line, 0600); #if SunOS == 40 if (ioctl(p, TIOCGPGRP, &dummy) == 0 || errno != EIO) { chmod(line, 0666); close(p); line[5] = 'p'; } else #endif /* SunOS == 40 */ return(p); } } } #else /* CRAY */ extern lowpty, highpty; struct stat sb; for (*ptynum = lowpty; *ptynum <= highpty; (*ptynum)++) { snprintf(myline, sizeof(myline), "/dev/pty/%03d", *ptynum); p = open(myline, 2); if (p < 0) continue; snprintf(line, sizeof(Xline), "/dev/ttyp%03d", *ptynum); /* * Here are some shenanigans to make sure that there * are no listeners lurking on the line. */ if(stat(line, &sb) < 0) { close(p); continue; } if(sb.st_uid || sb.st_gid || sb.st_mode != 0600) { chown(line, 0, 0); chmod(line, 0600); close(p); p = open(myline, 2); if (p < 0) continue; } /* * Now it should be safe...check for accessability. */ if (access(line, 6) == 0) return(p); else { /* no tty side to pty so skip it */ close(p); } } #endif /* CRAY */ #endif /* STREAMSPTY */ #endif /* OPENPTY */ return(-1); #endif } int tty_isecho(void) { return (termbuf.c_lflag & ECHO); } int tty_flowmode(void) { return((termbuf.c_iflag & IXON) ? 1 : 0); } int tty_restartany(void) { return((termbuf.c_iflag & IXANY) ? 1 : 0); } void tty_setecho(int on) { if (on) termbuf.c_lflag |= ECHO; else termbuf.c_lflag &= ~ECHO; } int tty_israw(void) { return(!(termbuf.c_lflag & ICANON)); } void tty_binaryin(int on) { if (on) { termbuf.c_iflag &= ~ISTRIP; } else { termbuf.c_iflag |= ISTRIP; } } void tty_binaryout(int on) { if (on) { termbuf.c_cflag &= ~(CSIZE|PARENB); termbuf.c_cflag |= CS8; termbuf.c_oflag &= ~OPOST; } else { termbuf.c_cflag &= ~CSIZE; termbuf.c_cflag |= CS7|PARENB; termbuf.c_oflag |= OPOST; } } int tty_isbinaryin(void) { return(!(termbuf.c_iflag & ISTRIP)); } int tty_isbinaryout(void) { return(!(termbuf.c_oflag&OPOST)); } int tty_issofttab(void) { # ifdef OXTABS return (termbuf.c_oflag & OXTABS); # endif # ifdef TABDLY return ((termbuf.c_oflag & TABDLY) == TAB3); # endif } void tty_setsofttab(int on) { if (on) { # ifdef OXTABS termbuf.c_oflag |= OXTABS; # endif # ifdef TABDLY termbuf.c_oflag &= ~TABDLY; termbuf.c_oflag |= TAB3; # endif } else { # ifdef OXTABS termbuf.c_oflag &= ~OXTABS; # endif # ifdef TABDLY termbuf.c_oflag &= ~TABDLY; termbuf.c_oflag |= TAB0; # endif } } int tty_islitecho(void) { # ifdef ECHOCTL return (!(termbuf.c_lflag & ECHOCTL)); # endif # ifdef TCTLECH return (!(termbuf.c_lflag & TCTLECH)); # endif # if !defined(ECHOCTL) && !defined(TCTLECH) return (0); /* assumes ctl chars are echoed '^x' */ # endif } void tty_setlitecho(int on) { # ifdef ECHOCTL if (on) termbuf.c_lflag &= ~ECHOCTL; else termbuf.c_lflag |= ECHOCTL; # endif # ifdef TCTLECH if (on) termbuf.c_lflag &= ~TCTLECH; else termbuf.c_lflag |= TCTLECH; # endif } int tty_iscrnl(void) { return (termbuf.c_iflag & ICRNL); } /* * Try to guess whether speeds are "encoded" (4.2BSD) or just numeric (4.4BSD). */ #if B4800 != 4800 #define DECODE_BAUD #endif #ifdef DECODE_BAUD /* * A table of available terminal speeds */ struct termspeeds { int speed; int value; } termspeeds[] = { { 0, B0 }, { 50, B50 }, { 75, B75 }, { 110, B110 }, { 134, B134 }, { 150, B150 }, { 200, B200 }, { 300, B300 }, { 600, B600 }, { 1200, B1200 }, { 1800, B1800 }, { 2400, B2400 }, { 4800, B4800 }, #ifdef B7200 { 7200, B7200 }, #endif { 9600, B9600 }, #ifdef B14400 { 14400, B14400 }, #endif #ifdef B19200 { 19200, B19200 }, #endif #ifdef B28800 { 28800, B28800 }, #endif #ifdef B38400 { 38400, B38400 }, #endif #ifdef B57600 { 57600, B57600 }, #endif #ifdef B115200 { 115200, B115200 }, #endif #ifdef B230400 { 230400, B230400 }, #endif { -1, 0 } }; #endif /* DECODE_BUAD */ void tty_tspeed(int val) { #ifdef DECODE_BAUD struct termspeeds *tp; for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++) ; if (tp->speed == -1) /* back up to last valid value */ --tp; cfsetospeed(&termbuf, tp->value); #else /* DECODE_BUAD */ cfsetospeed(&termbuf, val); #endif /* DECODE_BUAD */ } void tty_rspeed(int val) { #ifdef DECODE_BAUD struct termspeeds *tp; for (tp = termspeeds; (tp->speed != -1) && (val > tp->speed); tp++) ; if (tp->speed == -1) /* back up to last valid value */ --tp; cfsetispeed(&termbuf, tp->value); #else /* DECODE_BAUD */ cfsetispeed(&termbuf, val); #endif /* DECODE_BAUD */ } #ifdef PARENT_DOES_UTMP extern struct utmp wtmp; extern char wtmpf[]; extern void utmp_sig_init (void); extern void utmp_sig_reset (void); extern void utmp_sig_wait (void); extern void utmp_sig_notify (int); # endif /* PARENT_DOES_UTMP */ #ifdef STREAMSPTY /* I_FIND seems to live a life of its own */ static int my_find(int fd, char *module) { #if defined(I_FIND) && defined(I_LIST) static int flag; static struct str_list sl; int n; int i; if(!flag){ n = ioctl(fd, I_LIST, 0); if(n < 0){ perror("ioctl(fd, I_LIST, 0)"); return -1; } sl.sl_modlist=(struct str_mlist*)malloc(n * sizeof(struct str_mlist)); sl.sl_nmods = n; n = ioctl(fd, I_LIST, &sl); if(n < 0){ perror("ioctl(fd, I_LIST, n)"); return -1; } flag = 1; } for(i=0; i= modules; p--){ err = ioctl(fd, I_PUSH, *p); if(err < 0 && errno != EINVAL) fatalperror(net, "I_PUSH"); } } #endif /* * getptyslave() * * Open the slave side of the pty, and do any initialization * that is necessary. The return value is a file descriptor * for the slave side. */ void getptyslave(void) { int t = -1; struct winsize ws; /* * Opening the slave side may cause initilization of the * kernel tty structure. We need remember the state of * if linemode was turned on * terminal window size * terminal speed * so that we can re-set them if we need to. */ /* * Make sure that we don't have a controlling tty, and * that we are the session (process group) leader. */ #ifdef HAVE_SETSID if(setsid()<0) fatalperror(net, "setsid()"); #else # ifdef TIOCNOTTY t = open(_PATH_TTY, O_RDWR); if (t >= 0) { ioctl(t, TIOCNOTTY, (char *)0); close(t); } # endif #endif # ifdef PARENT_DOES_UTMP /* * Wait for our parent to get the utmp stuff to get done. */ utmp_sig_wait(); # endif t = cleanopen(line); if (t < 0) fatalperror(net, line); #ifdef STREAMSPTY ttyfd = t; /* * Not all systems have (or need) modules ttcompat and pckt so * don't flag it as a fatal error if they don't exist. */ if (really_stream) { /* these are the streams modules that we want pushed. note that they are in reverse order, ptem will be pushed first. maybe_push_modules() will try to push all modules before the first one that isn't already pushed. i.e if ldterm is pushed, only ttcompat will be attempted. all this is because we don't know which modules are available, and we don't know which modules are already pushed (via autopush, for instance). */ char *ttymodules[] = { "ttcompat", "ldterm", "ptem", NULL }; char *ptymodules[] = { "pckt", NULL }; maybe_push_modules(t, ttymodules); maybe_push_modules(ourpty, ptymodules); } #endif /* * set up the tty modes as we like them to be. */ init_termbuf(); # ifdef TIOCSWINSZ if (def_row || def_col) { memset(&ws, 0, sizeof(ws)); ws.ws_col = def_col; ws.ws_row = def_row; ioctl(t, TIOCSWINSZ, (char *)&ws); } # endif /* * Settings for sgtty based systems */ /* * Settings for UNICOS (and HPUX) */ # if defined(_CRAY) || defined(__hpux) termbuf.c_oflag = OPOST|ONLCR|TAB3; termbuf.c_iflag = IGNPAR|ISTRIP|ICRNL|IXON; termbuf.c_lflag = ISIG|ICANON|ECHO|ECHOE|ECHOK; termbuf.c_cflag = EXTB|HUPCL|CS8; # endif /* * Settings for all other termios/termio based * systems, other than 4.4BSD. In 4.4BSD the * kernel does the initial terminal setup. */ # if !(defined(_CRAY) || defined(__hpux)) && (BSD <= 43) # ifndef OXTABS # define OXTABS 0 # endif termbuf.c_lflag |= ECHO; termbuf.c_oflag |= ONLCR|OXTABS; termbuf.c_iflag |= ICRNL; termbuf.c_iflag &= ~IXOFF; # endif tty_rspeed((def_rspeed > 0) ? def_rspeed : 9600); tty_tspeed((def_tspeed > 0) ? def_tspeed : 9600); /* * Set the tty modes, and make this our controlling tty. */ set_termbuf(); if (login_tty(t) == -1) fatalperror(net, "login_tty"); if (net > 2) close(net); if (ourpty > 2) { close(ourpty); ourpty = -1; } } #ifndef O_NOCTTY #define O_NOCTTY 0 #endif /* * Open the specified slave side of the pty, * making sure that we have a clean tty. */ int cleanopen(char *line) { int t; #ifdef STREAMSPTY if (!really_stream) #endif { /* * Make sure that other people can't open the * slave side of the connection. */ chown(line, 0, 0); chmod(line, 0600); } #ifdef HAVE_REVOKE revoke(line); #endif t = open(line, O_RDWR|O_NOCTTY); if (t < 0) return(-1); /* * Hangup anybody else using this ttyp, then reopen it for * ourselves. */ # if !(defined(_CRAY) || defined(__hpux)) && (BSD <= 43) && !defined(STREAMSPTY) signal(SIGHUP, SIG_IGN); #ifdef HAVE_VHANGUP vhangup(); #else #endif signal(SIGHUP, SIG_DFL); t = open(line, O_RDWR|O_NOCTTY); if (t < 0) return(-1); # endif # if defined(_CRAY) && defined(TCVHUP) { int i; signal(SIGHUP, SIG_IGN); ioctl(t, TCVHUP, (char *)0); signal(SIGHUP, SIG_DFL); i = open(line, O_RDWR); if (i < 0) return(-1); close(t); t = i; } # endif /* defined(CRAY) && defined(TCVHUP) */ return(t); } #if !defined(BSD4_4) int login_tty(int t) { # if defined(TIOCSCTTY) && !defined(__hpux) if (ioctl(t, TIOCSCTTY, (char *)0) < 0) fatalperror(net, "ioctl(sctty)"); # ifdef _CRAY /* * Close the hard fd to /dev/ttypXXX, and re-open through * the indirect /dev/tty interface. */ close(t); if ((t = open("/dev/tty", O_RDWR)) < 0) fatalperror(net, "open(/dev/tty)"); # endif # else /* * We get our controlling tty assigned as a side-effect * of opening up a tty device. But on BSD based systems, * this only happens if our process group is zero. The * setsid() call above may have set our pgrp, so clear * it out before opening the tty... */ #ifdef HAVE_SETPGID setpgid(0, 0); #else setpgrp(0, 0); /* if setpgid isn't available, setpgrp probably takes arguments */ #endif close(open(line, O_RDWR)); # endif if (t != 0) dup2(t, 0); if (t != 1) dup2(t, 1); if (t != 2) dup2(t, 2); if (t > 2) close(t); return(0); } #endif /* BSD <= 43 */ /* * This comes from ../../bsd/tty.c and should not really be here. */ /* * Clean the tty name. Return a pointer to the cleaned version. */ static char * clean_ttyname (char *tty) { char *res = tty; if (strncmp (res, _PATH_DEV, strlen(_PATH_DEV)) == 0) res += strlen(_PATH_DEV); if (strncmp (res, "pty/", 4) == 0) res += 4; if (strncmp (res, "ptym/", 5) == 0) res += 5; return res; } /* * Generate a name usable as an `ut_id', typically without `tty'. */ #ifdef HAVE_STRUCT_UTMP_UT_ID static char * make_id (char *tty) { char *res = tty; if (strncmp (res, "pts/", 4) == 0) res += 4; if (strncmp (res, "tty", 3) == 0) res += 3; return res; } #endif /* * startslave(host) * * Given a hostname, do whatever * is necessary to startup the login process on the slave side of the pty. */ /* ARGSUSED */ void startslave(const char *host, const char *utmp_host, int autologin, char *autoname) { int i; #ifdef AUTHENTICATION if (!autoname || !autoname[0]) autologin = 0; if (autologin < auth_level) { fatal(net, "Authorization failed"); exit(1); } #endif { char *tbuf = "\r\n*** Connection not encrypted! " "Communication may be eavesdropped. ***\r\n"; #ifdef ENCRYPTION if (!no_warn && (encrypt_output == 0 || decrypt_input == 0)) #endif writenet((unsigned char*)tbuf, strlen(tbuf)); } # ifdef PARENT_DOES_UTMP utmp_sig_init(); # endif /* PARENT_DOES_UTMP */ if ((i = fork()) < 0) fatalperror(net, "fork"); if (i) { # ifdef PARENT_DOES_UTMP /* * Cray parent will create utmp entry for child and send * signal to child to tell when done. Child waits for signal * before doing anything important. */ int pid = i; void sigjob (int); setpgrp(); utmp_sig_reset(); /* reset handler to default */ /* * Create utmp entry for child */ wtmp.ut_time = time(NULL); wtmp.ut_type = LOGIN_PROCESS; wtmp.ut_pid = pid; strncpy(wtmp.ut_user, "LOGIN", sizeof(wtmp.ut_user)); strncpy(wtmp.ut_host, utmp_host, sizeof(wtmp.ut_host)); strncpy(wtmp.ut_line, clean_ttyname(line), sizeof(wtmp.ut_line)); #ifdef HAVE_STRUCT_UTMP_UT_ID strncpy(wtmp.ut_id, wtmp.ut_line + 3, sizeof(wtmp.ut_id)); #endif pututline(&wtmp); endutent(); if ((i = open(wtmpf, O_WRONLY|O_APPEND)) >= 0) { write(i, &wtmp, sizeof(struct utmp)); close(i); } #ifdef _CRAY signal(WJSIGNAL, sigjob); #endif utmp_sig_notify(pid); # endif /* PARENT_DOES_UTMP */ } else { getptyslave(); #if defined(DCE) /* if we authenticated via K5, try and join the PAG */ kerberos5_dfspag(); #endif start_login(host, autologin, autoname); /*NOTREACHED*/ } } char *envinit[3]; extern char **environ; void init_env(void) { char **envp; envp = envinit; if ((*envp = getenv("TZ"))) *envp++ -= 3; #if defined(_CRAY) || defined(__hpux) else *envp++ = "TZ=GMT0"; #endif *envp = 0; environ = envinit; } /* * scrub_env() * * We only accept the environment variables listed below. */ static void scrub_env(void) { static const char *reject[] = { "TERMCAP=/", NULL }; static const char *accept[] = { "XAUTH=", "XAUTHORITY=", "DISPLAY=", "TERM=", "EDITOR=", "PAGER=", "PRINTER=", "LOGNAME=", "POSIXLY_CORRECT=", "TERMCAP=", NULL }; char **cpp, **cpp2; const char **p; for (cpp2 = cpp = environ; *cpp; cpp++) { int reject_it = 0; for(p = reject; *p; p++) if(strncmp(*cpp, *p, strlen(*p)) == 0) { reject_it = 1; break; } if (reject_it) continue; for(p = accept; *p; p++) if(strncmp(*cpp, *p, strlen(*p)) == 0) break; if(*p != NULL) *cpp2++ = *cpp; } *cpp2 = NULL; } struct arg_val { int size; int argc; const char **argv; }; static void addarg(struct arg_val*, const char*); /* * start_login(host) * * Assuming that we are now running as a child processes, this * function will turn us into the login process. */ void start_login(const char *host, int autologin, char *name) { struct arg_val argv; char *user; int save_errno; #ifdef HAVE_UTMPX_H int pid = getpid(); struct utmpx utmpx; char *clean_tty; /* * Create utmp entry for child */ clean_tty = clean_ttyname(line); memset(&utmpx, 0, sizeof(utmpx)); strncpy(utmpx.ut_user, ".telnet", sizeof(utmpx.ut_user)); strncpy(utmpx.ut_line, clean_tty, sizeof(utmpx.ut_line)); #ifdef HAVE_STRUCT_UTMP_UT_ID strncpy(utmpx.ut_id, make_id(clean_tty), sizeof(utmpx.ut_id)); #endif utmpx.ut_pid = pid; utmpx.ut_type = LOGIN_PROCESS; gettimeofday (&utmpx.ut_tv, NULL); if (pututxline(&utmpx) == NULL) fatal(net, "pututxline failed"); #endif scrub_env(); /* * -h : pass on name of host. * WARNING: -h is accepted by login if and only if * getuid() == 0. * -p : don't clobber the environment (so terminal type stays set). * * -f : force this login, he has already been authenticated */ /* init argv structure */ argv.size=0; argv.argc=0; argv.argv=malloc(0); /*so we can call realloc later */ addarg(&argv, "login"); addarg(&argv, "-h"); addarg(&argv, host); addarg(&argv, "-p"); if(name[0]) user = name; else user = getenv("USER"); #ifdef AUTHENTICATION if (auth_level < 0 || autologin != AUTH_VALID) { if(!no_warn) { printf("User not authenticated. "); if (require_otp) printf("Using one-time password\r\n"); else printf("Using plaintext username and password\r\n"); } if (require_otp) { addarg(&argv, "-a"); addarg(&argv, "otp"); } if(log_unauth) syslog(LOG_INFO, "unauthenticated access from %s (%s)", host, user ? user : "unknown user"); } if (auth_level >= 0 && autologin == AUTH_VALID) addarg(&argv, "-f"); #endif if(user){ addarg(&argv, "--"); addarg(&argv, strdup(user)); } if (getenv("USER")) { /* * Assume that login will set the USER variable * correctly. For SysV systems, this means that * USER will no longer be set, just LOGNAME by * login. (The problem is that if the auto-login * fails, and the user then specifies a different * account name, he can get logged in with both * LOGNAME and USER in his environment, but the * USER value will be wrong. */ unsetenv("USER"); } closelog(); /* * This sleep(1) is in here so that telnetd can * finish up with the tty. There's a race condition * the login banner message gets lost... */ sleep(1); execv(new_login, argv.argv); save_errno = errno; syslog(LOG_ERR, "%s: %m\n", new_login); fatalperror_errno(net, new_login, save_errno); /*NOTREACHED*/ } static void addarg(struct arg_val *argv, const char *val) { if(argv->size <= argv->argc+1) { argv->argv = realloc(argv->argv, sizeof(char*) * (argv->size + 10)); if (argv->argv == NULL) fatal (net, "realloc: out of memory"); argv->size+=10; } argv->argv[argv->argc++] = val; argv->argv[argv->argc] = NULL; } /* * rmut() * * This is the function called by cleanup() to * remove the utmp entry for this person. */ #ifdef HAVE_UTMPX_H static void rmut(void) { struct utmpx utmpx, *non_save_utxp; char *clean_tty = clean_ttyname(line); /* * This updates the utmpx and utmp entries and make a wtmp/x entry */ setutxent(); memset(&utmpx, 0, sizeof(utmpx)); strncpy(utmpx.ut_line, clean_tty, sizeof(utmpx.ut_line)); utmpx.ut_type = LOGIN_PROCESS; non_save_utxp = getutxline(&utmpx); if (non_save_utxp) { struct utmpx *utxp; char user0; utxp = malloc(sizeof(struct utmpx)); *utxp = *non_save_utxp; user0 = utxp->ut_user[0]; utxp->ut_user[0] = '\0'; utxp->ut_type = DEAD_PROCESS; #ifdef HAVE_STRUCT_UTMPX_UT_EXIT #ifdef _STRUCT___EXIT_STATUS utxp->ut_exit.__e_termination = 0; utxp->ut_exit.__e_exit = 0; #elif defined(__osf__) /* XXX */ utxp->ut_exit.ut_termination = 0; utxp->ut_exit.ut_exit = 0; #else utxp->ut_exit.e_termination = 0; utxp->ut_exit.e_exit = 0; #endif #endif gettimeofday(&utxp->ut_tv, NULL); pututxline(utxp); #ifdef WTMPX_FILE utxp->ut_user[0] = user0; updwtmpx(WTMPX_FILE, utxp); #elif defined(WTMP_FILE) /* This is a strange system with a utmpx and a wtmp! */ { int f = open(wtmpf, O_WRONLY|O_APPEND); struct utmp wtmp; if (f >= 0) { strncpy(wtmp.ut_line, clean_tty, sizeof(wtmp.ut_line)); strncpy(wtmp.ut_name, "", sizeof(wtmp.ut_name)); #ifdef HAVE_STRUCT_UTMP_UT_HOST strncpy(wtmp.ut_host, "", sizeof(wtmp.ut_host)); #endif wtmp.ut_time = time(NULL); write(f, &wtmp, sizeof(wtmp)); close(f); } } #endif free (utxp); } endutxent(); } /* end of rmut */ #endif #if !defined(HAVE_UTMPX_H) && !(defined(_CRAY) || defined(__hpux)) && BSD <= 43 static void rmut(void) { int f; int found = 0; struct utmp *u, *utmp; int nutmp; struct stat statbf; char *clean_tty = clean_ttyname(line); f = open(utmpf, O_RDWR); if (f >= 0) { fstat(f, &statbf); utmp = (struct utmp *)malloc((unsigned)statbf.st_size); if (!utmp) syslog(LOG_ERR, "utmp malloc failed"); if (statbf.st_size && utmp) { nutmp = read(f, utmp, (int)statbf.st_size); nutmp /= sizeof(struct utmp); for (u = utmp ; u < &utmp[nutmp] ; u++) { if (strncmp(u->ut_line, clean_tty, sizeof(u->ut_line)) || u->ut_name[0]==0) continue; lseek(f, ((long)u)-((long)utmp), L_SET); strncpy(u->ut_name, "", sizeof(u->ut_name)); #ifdef HAVE_STRUCT_UTMP_UT_HOST strncpy(u->ut_host, "", sizeof(u->ut_host)); #endif u->ut_time = time(NULL); write(f, u, sizeof(wtmp)); found++; } } close(f); } if (found) { f = open(wtmpf, O_WRONLY|O_APPEND); if (f >= 0) { strncpy(wtmp.ut_line, clean_tty, sizeof(wtmp.ut_line)); strncpy(wtmp.ut_name, "", sizeof(wtmp.ut_name)); #ifdef HAVE_STRUCT_UTMP_UT_HOST strncpy(wtmp.ut_host, "", sizeof(wtmp.ut_host)); #endif wtmp.ut_time = time(NULL); write(f, &wtmp, sizeof(wtmp)); close(f); } } chmod(line, 0666); chown(line, 0, 0); line[strlen("/dev/")] = 'p'; chmod(line, 0666); chown(line, 0, 0); } /* end of rmut */ #endif /* CRAY */ #if defined(__hpux) && !defined(HAVE_UTMPX_H) static void rmut (char *line) { struct utmp utmp; struct utmp *utptr; int fd; /* for /etc/wtmp */ utmp.ut_type = USER_PROCESS; strncpy(utmp.ut_line, clean_ttyname(line), sizeof(utmp.ut_line)); setutent(); utptr = getutline(&utmp); /* write it out only if it exists */ if (utptr) { utptr->ut_type = DEAD_PROCESS; utptr->ut_time = time(NULL); pututline(utptr); /* set wtmp entry if wtmp file exists */ if ((fd = open(wtmpf, O_WRONLY | O_APPEND)) >= 0) { write(fd, utptr, sizeof(utmp)); close(fd); } } endutent(); chmod(line, 0666); chown(line, 0, 0); line[14] = line[13]; line[13] = line[12]; line[8] = 'm'; line[9] = '/'; line[10] = 'p'; line[11] = 't'; line[12] = 'y'; chmod(line, 0666); chown(line, 0, 0); } #endif /* * cleanup() * * This is the routine to call when we are all through, to * clean up anything that needs to be cleaned up. */ #ifdef PARENT_DOES_UTMP void cleanup(int sig) { #ifdef _CRAY static int incleanup = 0; int t; int child_status; /* status of child process as returned by waitpid */ int flags = WNOHANG|WUNTRACED; /* * 1: Pick up the zombie, if we are being called * as the signal handler. * 2: If we are a nested cleanup(), return. * 3: Try to clean up TMPDIR. * 4: Fill in utmp with shutdown of process. * 5: Close down the network and pty connections. * 6: Finish up the TMPDIR cleanup, if needed. */ if (sig == SIGCHLD) { while (waitpid(-1, &child_status, flags) > 0) ; /* VOID */ /* Check if the child process was stopped * rather than exited. We want cleanup only if * the child has died. */ if (WIFSTOPPED(child_status)) { return; } } t = sigblock(sigmask(SIGCHLD)); if (incleanup) { sigsetmask(t); return; } incleanup = 1; sigsetmask(t); t = cleantmp(&wtmp); setutent(); /* just to make sure */ #endif /* CRAY */ rmut(line); close(ourpty); shutdown(net, 2); #ifdef _CRAY if (t == 0) cleantmp(&wtmp); #endif /* CRAY */ exit(1); } #else /* PARENT_DOES_UTMP */ void cleanup(int sig) { #if defined(HAVE_UTMPX_H) || !defined(HAVE_LOGWTMP) rmut(); #ifdef HAVE_VHANGUP #ifndef __sgi vhangup(); /* XXX */ #endif #endif #else char *p; p = line + sizeof("/dev/") - 1; if (logout(p)) logwtmp(p, "", ""); chmod(line, 0666); chown(line, 0, 0); *p = 'p'; chmod(line, 0666); chown(line, 0, 0); #endif shutdown(net, 2); exit(1); } #endif /* PARENT_DOES_UTMP */ #ifdef PARENT_DOES_UTMP /* * _utmp_sig_rcv * utmp_sig_init * utmp_sig_wait * These three functions are used to coordinate the handling of * the utmp file between the server and the soon-to-be-login shell. * The server actually creates the utmp structure, the child calls * utmp_sig_wait(), until the server calls utmp_sig_notify() and * signals the future-login shell to proceed. */ static int caught=0; /* NZ when signal intercepted */ static void (*func)(); /* address of previous handler */ void _utmp_sig_rcv(sig) int sig; { caught = 1; signal(SIGUSR1, func); } void utmp_sig_init() { /* * register signal handler for UTMP creation */ if ((int)(func = signal(SIGUSR1, _utmp_sig_rcv)) == -1) fatalperror(net, "telnetd/signal"); } void utmp_sig_reset() { signal(SIGUSR1, func); /* reset handler to default */ } # ifdef __hpux # define sigoff() /* do nothing */ # define sigon() /* do nothing */ # endif void utmp_sig_wait() { /* * Wait for parent to write our utmp entry. */ sigoff(); while (caught == 0) { pause(); /* wait until we get a signal (sigon) */ sigoff(); /* turn off signals while we check caught */ } sigon(); /* turn on signals again */ } void utmp_sig_notify(pid) { kill(pid, SIGUSR1); } #ifdef _CRAY static int gotsigjob = 0; /*ARGSUSED*/ void sigjob(sig) int sig; { int jid; struct jobtemp *jp; while ((jid = waitjob(NULL)) != -1) { if (jid == 0) { return; } gotsigjob++; jobend(jid, NULL, NULL); } } /* * jid_getutid: * called by jobend() before calling cleantmp() * to find the correct $TMPDIR to cleanup. */ struct utmp * jid_getutid(jid) int jid; { struct utmp *cur = NULL; setutent(); /* just to make sure */ while (cur = getutent()) { if ( (cur->ut_type != NULL) && (jid == cur->ut_jid) ) { return(cur); } } return(0); } /* * Clean up the TMPDIR that login created. * The first time this is called we pick up the info * from the utmp. If the job has already gone away, * then we'll clean up and be done. If not, then * when this is called the second time it will wait * for the signal that the job is done. */ int cleantmp(wtp) struct utmp *wtp; { struct utmp *utp; static int first = 1; int mask, omask, ret; extern struct utmp *getutid (const struct utmp *_Id); mask = sigmask(WJSIGNAL); if (first == 0) { omask = sigblock(mask); while (gotsigjob == 0) sigpause(omask); return(1); } first = 0; setutent(); /* just to make sure */ utp = getutid(wtp); if (utp == 0) { syslog(LOG_ERR, "Can't get /etc/utmp entry to clean TMPDIR"); return(-1); } /* * Nothing to clean up if the user shell was never started. */ if (utp->ut_type != USER_PROCESS || utp->ut_jid == 0) return(1); /* * Block the WJSIGNAL while we are in jobend(). */ omask = sigblock(mask); ret = jobend(utp->ut_jid, utp->ut_tpath, utp->ut_user); sigsetmask(omask); return(ret); } int jobend(jid, path, user) int jid; char *path; char *user; { static int saved_jid = 0; static int pty_saved_jid = 0; static char saved_path[sizeof(wtmp.ut_tpath)+1]; static char saved_user[sizeof(wtmp.ut_user)+1]; /* * this little piece of code comes into play * only when ptyreconnect is used to reconnect * to an previous session. * * this is the only time when the * "saved_jid != jid" code is executed. */ if ( saved_jid && saved_jid != jid ) { if (!path) { /* called from signal handler */ pty_saved_jid = jid; } else { pty_saved_jid = saved_jid; } } if (path) { strncpy(saved_path, path, sizeof(wtmp.ut_tpath)); strncpy(saved_user, user, sizeof(wtmp.ut_user)); saved_path[sizeof(saved_path)] = '\0'; saved_user[sizeof(saved_user)] = '\0'; } if (saved_jid == 0) { saved_jid = jid; return(0); } /* if the jid has changed, get the correct entry from the utmp file */ if ( saved_jid != jid ) { struct utmp *utp = NULL; struct utmp *jid_getutid(); utp = jid_getutid(pty_saved_jid); if (utp == 0) { syslog(LOG_ERR, "Can't get /etc/utmp entry to clean TMPDIR"); return(-1); } cleantmpdir(jid, utp->ut_tpath, utp->ut_user); return(1); } cleantmpdir(jid, saved_path, saved_user); return(1); } /* * Fork a child process to clean up the TMPDIR */ cleantmpdir(jid, tpath, user) int jid; char *tpath; char *user; { switch(fork()) { case -1: syslog(LOG_ERR, "TMPDIR cleanup(%s): fork() failed: %m\n", tpath); break; case 0: execl(CLEANTMPCMD, CLEANTMPCMD, user, tpath, 0); syslog(LOG_ERR, "TMPDIR cleanup(%s): execl(%s) failed: %m\n", tpath, CLEANTMPCMD); exit(1); default: /* * Forget about child. We will exit, and * /etc/init will pick it up. */ break; } } #endif /* CRAY */ #endif /* defined(PARENT_DOES_UTMP) */