src/pty.c

   1 /* Copyright (c) 1993-2002
   2  *      Juergen Weigert (jnweiger@immd4.informatik.uni-erlangen.de)
   3  *      Michael Schroeder (mlschroe@immd4.informatik.uni-erlangen.de)
   4  * Copyright (c) 1987 Oliver Laumann
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation; either version 3, or (at your option)
   9  * any later version.
  10  *
  11  * This program is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with this program (see the file COPYING); if not, see
  18  * http://www.gnu.org/licenses/, or contact Free Software Foundation, Inc.,
  19  * 51 Franklin Street, Fifth Floor, Boston, MA  02111-1301  USA
  20  *
  21  ****************************************************************
  22  */
  23
  24 #include <sys/types.h>
  25 #include <sys/stat.h>
  26 #include <fcntl.h>
  27 #include <signal.h>
  28
  29 #include "config.h"
  30 #include "screen.h"
  31
  32 #ifndef sun
  33 # include <sys/ioctl.h>
  34 #endif
  35
  36 /* for solaris 2.1, Unixware (SVR4.2) and possibly others */
  37 #ifdef HAVE_STROPTS_H
  38 # include <sys/stropts.h>
  39 #endif
  40
  41 #if defined(sun) && defined(LOCKPTY) && !defined(TIOCEXCL)
  42 # include <sys/ttold.h>
  43 #endif
  44
  45 #ifdef ISC
  46 # include <sys/tty.h>
  47 # include <sys/sioctl.h>
  48 # include <sys/pty.h>
  49 #endif
  50
  51 #ifdef sgi
  52 # include <sys/sysmacros.h>
  53 #endif /* sgi */
  54
  55 #include "extern.h"
  56
  57 /*
  58  * if no PTYRANGE[01] is in the config file, we pick a default
  59  */
  60 #ifndef PTYRANGE0
  61 # define PTYRANGE0 "qpr"
  62 #endif
  63 #ifndef PTYRANGE1
  64 # define PTYRANGE1 "0123456789abcdef"
  65 #endif
  66
  67 /* SVR4 pseudo ttys don't seem to work with SCO-5 */
  68 #ifdef M_UNIX
  69 # undef HAVE_SVR4_PTYS
  70 #endif
  71
  72 extern int eff_uid;
  73
  74 /* used for opening a new pty-pair: */
  75 static char PtyName[32], TtyName[32];
  76
  77 #if !(defined(sequent) || defined(_SEQUENT_) || defined(HAVE_SVR4_PTYS))
  78 # ifdef hpux
  79 static char PtyProto[] = "/dev/ptym/ptyXY";
  80 static char TtyProto[] = "/dev/pty/ttyXY";
  81 # else
  82 #  ifdef M_UNIX
  83 static char PtyProto[] = "/dev/ptypXY";
  84 static char TtyProto[] = "/dev/ttypXY";
  85 #  else
  86 static char PtyProto[] = "/dev/ptyXY";
  87 static char TtyProto[] = "/dev/ttyXY";
  88 #  endif
  89 # endif /* hpux */
  90 #endif
  91
  92 static void initmaster __P((int));
  93
  94 #if defined(sun)
  95 /* sun's utmp_update program opens the salve side, thus corrupting
  96  */
  97 int pty_preopen = 1;
  98 #else
  99 int pty_preopen = 0;
 100 #endif
 101
 102 /*
 103  *  Open all ptys with O_NOCTTY, just to be on the safe side
 104  *  (RISCos mips breaks otherwise)
 105  */
 106 #ifndef O_NOCTTY
 107 # define O_NOCTTY 0
 108 #endif
 109
 110 /***************************************************************/
 111
 112 static void
 113 initmaster(f)
 114 int f;
 115 {
 116 #ifdef POSIX
 117   tcflush(f, TCIOFLUSH);
 118 #else
 119 # ifdef TIOCFLUSH
 120   (void) ioctl(f, TIOCFLUSH, (char *) 0);
 121 # endif
 122 #endif
 123 #ifdef LOCKPTY
 124   (void) ioctl(f, TIOCEXCL, (char *) 0);
 125 #endif
 126 }
 127
 128 void
 129 InitPTY(f)
 130 int f;
 131 {
 132   if (f < 0)
 133     return;
 134 #if defined(I_PUSH) && defined(HAVE_SVR4_PTYS) && !defined(sgi) && !defined(linux) && !defined(__osf__) && !defined(M_UNIX)
 135   if (ioctl(f, I_PUSH, "ptem"))
 136     Panic(errno, "InitPTY: cannot I_PUSH ptem");
 137   if (ioctl(f, I_PUSH, "ldterm"))
 138     Panic(errno, "InitPTY: cannot I_PUSH ldterm");
 139 # ifdef sun
 140   if (ioctl(f, I_PUSH, "ttcompat"))
 141     Panic(errno, "InitPTY: cannot I_PUSH ttcompat");
 142 # endif
 143 #endif
 144 }
 145
 146 /***************************************************************/
 147
 148 #if defined(OSX) && !defined(PTY_DONE)
 149 #define PTY_DONE
 150 int
 151 OpenPTY(ttyn)
 152 char **ttyn;
 153 {
 154   register int f;
 155   if ((f = open_controlling_pty(TtyName)) < 0)
 156     return -1;
 157   initmaster(f);
 158   *ttyn = TtyName;
 159   return f;
 160 }
 161 #endif
 162
 163 /***************************************************************/
 164
 165 #if (defined(sequent) || defined(_SEQUENT_)) && !defined(PTY_DONE)
 166 #define PTY_DONE
 167 int
 168 OpenPTY(ttyn)
 169 char **ttyn;
 170 {
 171   char *m, *s;
 172   register int f;
 173
 174   if ((f = getpseudotty(&s, &m)) < 0)
 175     return -1;
 176 #ifdef _SEQUENT_
 177   fvhangup(s);
 178 #endif
 179   strncpy(PtyName, m, sizeof(PtyName));
 180   strncpy(TtyName, s, sizeof(TtyName));
 181   initmaster(f);
 182   *ttyn = TtyName;
 183   return f;
 184 }
 185 #endif
 186
 187 /***************************************************************/
 188
 189 #if defined(__sgi) && !defined(PTY_DONE)
 190 #define PTY_DONE
 191 int
 192 OpenPTY(ttyn)
 193 char **ttyn;
 194 {
 195   int f;
 196   char *name, *_getpty();
 197   sigret_t (*sigcld)__P(SIGPROTOARG);
 198
 199   /*
 200    * SIGCHLD set to SIG_DFL for _getpty() because it may fork() and
 201    * exec() /usr/adm/mkpts
 202    */
 203   sigcld = signal(SIGCHLD, SIG_DFL);
 204   name = _getpty(&f, O_RDWR | O_NONBLOCK, 0600, 0);
 205   signal(SIGCHLD, sigcld);
 206
 207   if (name == 0)
 208     return -1;
 209   initmaster(f);
 210   *ttyn = name;
 211   return f;
 212 }
 213 #endif
 214
 215 /***************************************************************/
 216
 217 #if defined(MIPS) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
 218 #define PTY_DONE
 219 int
 220 OpenPTY(ttyn)
 221 char **ttyn;
 222 {
 223   register int f;
 224   struct stat buf;
 225
 226   strcpy(PtyName, "/dev/ptc");
 227   if ((f = open(PtyName, O_RDWR | O_NOCTTY | O_NONBLOCK)) < 0)
 228     return -1;
 229   if (fstat(f, &buf) < 0)
 230     {
 231       close(f);
 232       return -1;
 233     }
 234   sprintf(TtyName, "/dev/ttyq%d", minor(buf.st_rdev));
 235   initmaster(f);
 236   *ttyn = TtyName;
 237   return f;
 238 }
 239 #endif
 240
 241 /***************************************************************/
 242
 243 #if defined(HAVE_SVR4_PTYS) && !defined(PTY_DONE)
 244 #define PTY_DONE
 245 int
 246 OpenPTY(ttyn)
 247 char **ttyn;
 248 {
 249   register int f;
 250   char *m, *ptsname();
 251   int unlockpt __P((int)), grantpt __P((int));
 252 #if defined(HAVE_GETPT) && defined(linux)
 253   int getpt __P((void));
 254 #endif
 255   sigret_t (*sigcld)__P(SIGPROTOARG);
 256
 257   strcpy(PtyName, "/dev/ptmx");
 258 #if defined(HAVE_GETPT) && defined(linux)
 259   if ((f = getpt()) == -1)
 260 #else
 261   if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
 262 #endif
 263     return -1;
 264
 265   /*
 266    * SIGCHLD set to SIG_DFL for grantpt() because it fork()s and
 267    * exec()s pt_chmod
 268    */
 269   sigcld = signal(SIGCHLD, SIG_DFL);
 270   if ((m = ptsname(f)) == NULL || grantpt(f) || unlockpt(f))
 271     {
 272       signal(SIGCHLD, sigcld);
 273       close(f);
 274       return -1;
 275     }
 276   signal(SIGCHLD, sigcld);
 277   strncpy(TtyName, m, sizeof(TtyName));
 278   initmaster(f);
 279   *ttyn = TtyName;
 280   return f;
 281 }
 282 #endif
 283
 284 /***************************************************************/
 285
 286 #if defined(_AIX) && defined(HAVE_DEV_PTC) && !defined(PTY_DONE)
 287 #define PTY_DONE
 288
 289 int
 290 OpenPTY(ttyn)
 291 char **ttyn;
 292 {
 293   register int f;
 294
 295   /* a dumb looking loop replaced by mycrofts code: */
 296   strcpy (PtyName, "/dev/ptc");
 297   if ((f = open (PtyName, O_RDWR | O_NOCTTY)) < 0)
 298     return -1;
 299   strncpy(TtyName, ttyname(f), sizeof(TtyName));
 300   if (eff_uid && access(TtyName, R_OK | W_OK))
 301     {
 302       close(f);
 303       return -1;
 304     }
 305   initmaster(f);
 306 # ifdef _IBMR2
 307   pty_preopen = 1;
 308 # endif
 309   *ttyn = TtyName;
 310   return f;
 311 }
 312 #endif
 313
 314 /***************************************************************/
 315
 316 #if defined(HAVE_OPENPTY) && !defined(PTY_DONE)
 317 #define PTY_DONE
 318 int
 319 OpenPTY(ttyn)
 320 char **ttyn;
 321 {
 322   int f, s;
 323   if (openpty(&f, &s, TtyName, NULL, NULL) != 0)
 324     return -1;
 325   close(s);
 326   initmaster(f);
 327   pty_preopen = 1;
 328   *ttyn = TtyName;
 329   return f;
 330 }
 331 #endif
 332
 333 /***************************************************************/
 334
 335 #ifndef PTY_DONE
 336 int
 337 OpenPTY(ttyn)
 338 char **ttyn;
 339 {
 340   register char *p, *q, *l, *d;
 341   register int f;
 342
 343   debug("OpenPTY: Using BSD style ptys.\n");
 344   strcpy(PtyName, PtyProto);
 345   strcpy(TtyName, TtyProto);
 346   for (p = PtyName; *p != 'X'; p++)
 347     ;
 348   for (q = TtyName; *q != 'X'; q++)
 349     ;
 350   for (l = PTYRANGE0; (*p = *l) != '\0'; l++)
 351     {
 352       for (d = PTYRANGE1; (p[1] = *d) != '\0'; d++)
 353         {
 354           debug1("OpenPTY tries '%s'\n", PtyName);
 355           if ((f = open(PtyName, O_RDWR | O_NOCTTY)) == -1)
 356             continue;
 357           q[0] = *l;
 358           q[1] = *d;
 359           if (eff_uid && access(TtyName, R_OK | W_OK))
 360             {
 361               close(f);
 362               continue;
 363             }
 364 #if defined(sun) && defined(TIOCGPGRP) && !defined(SUNOS3)
 365           /* Hack to ensure that the slave side of the pty is
 366            * unused. May not work in anything other than SunOS4.1
 367            */
 368             {
 369               int pgrp;
 370
 371               /* tcgetpgrp does not work (uses TIOCGETPGRP)! */
 372               if (ioctl(f, TIOCGPGRP, (char *)&pgrp) != -1 || errno != EIO)
 373                 {
 374                   close(f);
 375                   continue;
 376                 }
 377             }
 378 #endif
 379           initmaster(f);
 380           *ttyn = TtyName;
 381           return f;
 382         }
 383     }
 384   return -1;
 385 }
 386 #endif
 387