xio-progcall.c

   1 /* source: xio-progcall.c */
   2 /* Copyright Gerhard Rieger */
   3 /* Published under the GNU General Public License V.2, see file COPYING */
   4
   5 /* this file contains common code dealing with program calls (exec, system) */
   6
   7 #include "xiosysincludes.h"
   8 #include "xioopen.h"
   9
  10 #include "xio-process.h"
  11 #include "xio-progcall.h"
  12
  13 #include "xio-socket.h"
  14
  15
  16 /* these options are used by address pty too */
  17 #if HAVE_OPENPTY
  18 const struct optdesc opt_openpty = { "openpty",   NULL, OPT_OPENPTY,     GROUP_PTY,   PH_BIGEN, TYPE_BOOL,      OFUNC_SPEC };
  19 #endif /* HAVE_OPENPTY */
  20 #if HAVE_DEV_PTMX || HAVE_DEV_PTC
  21 const struct optdesc opt_ptmx    = { "ptmx",      NULL, OPT_PTMX,        GROUP_PTY,   PH_BIGEN, TYPE_BOOL,      OFUNC_SPEC };
  22 #endif
  23
  24 #if WITH_EXEC || WITH_SYSTEM
  25
  26 #define MAXPTYNAMELEN 64
  27
  28 const struct optdesc opt_fdin    = { "fdin",      NULL, OPT_FDIN,        GROUP_FORK,   PH_PASTBIGEN,   TYPE_USHORT,     OFUNC_SPEC };
  29 const struct optdesc opt_fdout   = { "fdout",     NULL, OPT_FDOUT,       GROUP_FORK,   PH_PASTBIGEN,   TYPE_USHORT,     OFUNC_SPEC };
  30 const struct optdesc opt_path    = { "path",      NULL, OPT_PATH,        GROUP_EXEC,   PH_PREEXEC,     TYPE_STRING,     OFUNC_SPEC };
  31 const struct optdesc opt_pipes   = { "pipes",     NULL, OPT_PIPES,       GROUP_FORK,   PH_BIGEN,       TYPE_BOOL,       OFUNC_SPEC };
  32 #if HAVE_PTY
  33 const struct optdesc opt_pty     = { "pty",       NULL, OPT_PTY,         GROUP_FORK,   PH_BIGEN, TYPE_BOOL,     OFUNC_SPEC };
  34 #endif
  35 const struct optdesc opt_stderr  = { "stderr",    NULL, OPT_STDERR,      GROUP_FORK,   PH_PASTFORK,        TYPE_BOOL,   OFUNC_SPEC };
  36 const struct optdesc opt_nofork  = { "nofork",    NULL, OPT_NOFORK,      GROUP_FORK,   PH_BIGEN,       TYPE_BOOL,       OFUNC_SPEC };
  37 const struct optdesc opt_sighup  = { "sighup",    NULL, OPT_SIGHUP,      GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGHUP };
  38 const struct optdesc opt_sigint  = { "sigint",    NULL, OPT_SIGINT,      GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGINT };
  39 const struct optdesc opt_sigquit = { "sigquit",   NULL, OPT_SIGQUIT,     GROUP_PARENT, PH_LATE,        TYPE_CONST,      OFUNC_SIGNAL, SIGQUIT };
  40
  41
  42 /* fork for exec/system, but return before exec'ing.
  43    return=0: is child process
  44    return>0: is parent process
  45    return<0: error occurred, assume parent process and no child exists !!!
  46  */
  47 int _xioopen_foxec(int xioflags,        /* XIO_RDONLY etc. */
  48                 struct single *fd,
  49                 unsigned groups,
  50                    struct opt **copts,  /* in: opts; out: opts for child */
  51                    int *duptostderr     /* out: redirect stderr to output fd */
  52                 ) {
  53    struct opt *popts;   /* parent process options */
  54    int numleft;
  55    int d, sv[2], rdpip[2], wrpip[2];
  56    int rw = (xioflags & XIO_ACCMODE);
  57    bool usepipes = false;
  58 #if HAVE_PTY
  59    int ptyfd = -1, ttyfd = -1;
  60    bool usebestpty = false;     /* use the best available way to open pty */
  61 #if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
  62    bool useptmx = false;        /* use /dev/ptmx or equivalent */
  63 #endif
  64 #if HAVE_OPENPTY
  65    bool useopenpty = false;     /* try only openpty */
  66 #endif  /* HAVE_OPENPTY */
  67    bool usepty = false;         /* any of the pty options is selected */
  68    char ptyname[MAXPTYNAMELEN];
  69 #endif /* HAVE_PTY */
  70    pid_t pid = 0;       /* mostly int */
  71    short fdi = 0, fdo = 1;
  72    short result;
  73    bool withstderr = false;
  74    bool nofork = false;
  75    bool withfork;
  76
  77    popts = moveopts(*copts, GROUP_ALL);
  78    if (applyopts_single(fd, popts, PH_INIT) < 0)  return -1;
  79    applyopts2(-1, popts, PH_INIT, PH_EARLY);
  80
  81    retropt_bool(popts, OPT_NOFORK, &nofork);
  82    withfork = !nofork;
  83
  84    retropt_bool(popts, OPT_PIPES, &usepipes);
  85 #if HAVE_PTY
  86    retropt_bool(popts, OPT_PTY, &usebestpty);
  87 #if HAVE_OPENPTY
  88    retropt_bool(popts, OPT_OPENPTY, &useopenpty);
  89 #endif
  90 #if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
  91    retropt_bool(popts, OPT_PTMX, &useptmx);
  92 #endif
  93    usepty = (usebestpty
  94 #if HAVE_OPENPTY
  95              || useopenpty
  96 #endif
  97 #if defined(HAVE_DEV_PTMX) || defined(HAVE_DEV_PTC)
  98              || useptmx
  99 #endif
 100              );
 101    if (usepipes && usepty) {
 102       Warn("_xioopen_foxec(): options \"pipes\" and \"pty\" must not be specified together; ignoring \"pipes\"");
 103       usepipes = false;
 104    }
 105 #endif /* HAVE_PTY */
 106
 107    if (retropt_ushort(popts, OPT_FDIN,  (unsigned short *)&fdi) >= 0) {
 108       if ((xioflags&XIO_ACCMODE) == XIO_RDONLY) {
 109          Error("_xioopen_foxec(): option fdin is useless in read-only mode");
 110       }
 111    }
 112    if (retropt_ushort(popts, OPT_FDOUT, (unsigned short *)&fdo) >= 0) {
 113       if ((xioflags&XIO_ACCMODE) == XIO_WRONLY) {
 114          Error("_xioopen_foxec(): option fdout is useless in write-only mode");
 115       }
 116    }
 117
 118    if (withfork) {
 119       if (!(xioflags&XIO_MAYCHILD)) {
 120          Error("cannot fork off child process here");
 121          /*!! free something */
 122          return -1;
 123       }
 124       fd->flags |= XIO_DOESCHILD;
 125
 126 #if HAVE_PTY
 127       Notice2("forking off child, using %s for %s",
 128             &("socket\0\0pipes\0\0\0pty\0\0\0\0\0"[(usepipes<<3)|(usepty<<4)]),
 129               ddirection[rw]);
 130 #else
 131       Notice2("forking off child, using %s for %s",
 132               &("socket\0\0pipes\0\0\0"[(usepipes<<3)]),
 133               ddirection[rw]);
 134 #endif /* HAVE_PTY */
 135    }
 136    applyopts(-1, popts, PH_PREBIGEN);
 137
 138    if (!withfork) {
 139       /*0 struct single *stream1, *stream2;*/
 140
 141       if (!(xioflags & XIO_MAYEXEC /* means exec+nofork */)) {
 142          Error("option nofork is not allowed here");
 143          /*!! free something */
 144          return -1;
 145       }
 146       fd->flags |= XIO_DOESEXEC;
 147
 148       free(*copts);
 149       *copts = moveopts(popts, GROUP_ALL);
 150
 151 #if 0 /*!! */
 152       if (sock1->tag == XIO_TAG_DUAL) {
 153          stream1 = &sock1->dual.stream[0]->stream;
 154          stream2 = &sock1->dual.stream[1]->stream;
 155       } else {
 156          stream1 = &sock1->stream;
 157          stream2 = &sock1->stream;
 158       }
 159       if (stream1->dtype == DATA_READLINE || stream2->dtype == DATA_READLINE ||
 160           stream1->dtype == DATA_OPENSSL  || stream2->dtype == DATA_OPENSSL
 161           ) {
 162          Error("with option nofork, openssl and readline in address1 do not work");
 163       }
 164       if (stream1->lineterm != LINETERM_RAW ||
 165           stream2->lineterm != LINETERM_RAW ||
 166           stream1->ignoreeof || stream2->ignoreeof) {
 167          Warn("due to option nofork, address1 options for lineterm and igoreeof do not apply");
 168       }
 169 #endif
 170
 171       /*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
 172       if (rw != XIO_WRONLY) {
 173          if (XIO_GETRDFD(sock[0]/*!!*/) == fdi) {
 174             if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
 175                Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
 176             }
 177             if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
 178                Error3("dup2(%d, %d): %s",
 179                       XIO_GETRDFD(sock[0]), fdi, strerror(errno));
 180             }
 181             /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
 182          } else {
 183             if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
 184                Error3("dup2(%d, %d): %s",
 185                       XIO_GETRDFD(sock[0]), fdi, strerror(errno));
 186             }
 187             /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
 188          }
 189       }
 190       if (rw != XIO_RDONLY) {
 191          if (XIO_GETWRFD(sock[0]) == fdo) {
 192             if (Fcntl_l(fdo, F_SETFD, 0) < 0) {
 193                Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
 194             }
 195             if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
 196                Error3("dup2(%d, %d): %s)",
 197                       XIO_GETWRFD(sock[0]), fdo, strerror(errno));
 198             }
 199             /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 200          } else {
 201             if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
 202                Error3("dup2(%d, %d): %s)",
 203                       XIO_GETWRFD(sock[0]), fdo, strerror(errno));
 204             }
 205             /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 206          }
 207       }
 208    } else
 209 #if HAVE_PTY
 210    if (usepty) {
 211
 212 #if defined(HAVE_DEV_PTMX)
 213 #  define PTMX "/dev/ptmx"      /* Linux */
 214 #elif HAVE_DEV_PTC
 215 #  define PTMX "/dev/ptc"       /* AIX 4.3.3 */
 216 #endif
 217       fd->dtype = XIODATA_PTY;
 218 #if HAVE_DEV_PTMX || HAVE_DEV_PTC
 219       if (usebestpty || useptmx) {
 220          if ((ptyfd = Open(PTMX, O_RDWR|O_NOCTTY, 0620)) < 0) {
 221             Warn1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620): %s",
 222                   strerror(errno));
 223             /*!*/
 224          } else {
 225             /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", PTMX, ptyfd);*/
 226          }
 227          if (ptyfd >= 0 && ttyfd < 0) {
 228             char *tn = NULL;
 229             /* we used PTMX before forking */
 230             extern char *ptsname(int);
 231 #if HAVE_GRANTPT        /* AIX, not Linux */
 232             if (Grantpt(ptyfd)/*!*/ < 0) {
 233                Warn2("grantpt(%d): %s", ptyfd, strerror(errno));
 234             }
 235 #endif /* HAVE_GRANTPT */
 236 #if HAVE_UNLOCKPT
 237             if (Unlockpt(ptyfd)/*!*/ < 0) {
 238                Warn2("unlockpt(%d): %s", ptyfd, strerror(errno));
 239             }
 240 #endif /* HAVE_UNLOCKPT */
 241 #if HAVE_PROTOTYPE_LIB_ptsname  /* AIX, not Linux */
 242             if ((tn = Ptsname(ptyfd)) == NULL) {
 243                Warn2("ptsname(%d): %s", ptyfd, strerror(errno));
 244             }
 245 #endif /* HAVE_PROTOTYPE_LIB_ptsname */
 246             if (tn == NULL) {
 247                if ((tn = Ttyname(ptyfd)) == NULL) {
 248                   Error2("ttyname(%d): %s", ptyfd, strerror(errno));
 249                }
 250             }
 251             ptyname[0] = '\0'; strncat(ptyname, tn, MAXPTYNAMELEN-1);
 252             if ((ttyfd = Open(tn, O_RDWR|O_NOCTTY, 0620)) < 0) {
 253                Warn2("open(\"%s\", O_RDWR|O_NOCTTY, 0620): %s", tn, strerror(errno));
 254             } else {
 255                /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", tn, ttyfd);*/
 256             }
 257
 258 #ifdef I_PUSH
 259             /* Linux: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> -1 EINVAL */
 260             /* AIX:   I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 1 */
 261             /* SunOS: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
 262             /* HP-UX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
 263             if (Ioctl(ttyfd, I_FIND, "ldterm") == 0) {
 264                Ioctl(ttyfd, I_PUSH, "ptem");            /* 0 */
 265                Ioctl(ttyfd, I_PUSH, "ldterm");          /* 0 */
 266                Ioctl(ttyfd, I_PUSH, "ttcompat");        /* HP-UX: -1 */
 267             }
 268 #endif
 269
 270 #if 0       /* the following block need not work */
 271
 272             if (ttyfd >= 0 && ((tn = Ttyname(ttyfd)) == NULL)) {
 273                Warn2("ttyname(%d): %s", ttyfd, strerror(errno));
 274             }
 275             if (tn == NULL) {
 276                Error("could not open pty");
 277                return -1;
 278             }
 279 #endif
 280             Info1("opened pseudo terminal %s", tn);
 281          }
 282       }
 283 #endif /* HAVE_DEV_PTMX || HAVE_DEV_PTC */
 284 #if HAVE_OPENPTY
 285       if (ptyfd < 0) {
 286          int result;
 287          if ((result = Openpty(&ptyfd, &ttyfd, ptyname, NULL, NULL)) < 0) {
 288             Error4("openpty(%p, %p, %p, NULL, NULL): %s",
 289                    &ptyfd, &ttyfd, ptyname, strerror(errno));
 290             return -1;
 291          }
 292       }
 293 #endif /* HAVE_OPENPTY */
 294       free(*copts);
 295       if ((*copts = moveopts(popts, GROUP_TERMIOS|GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
 296          return -1;
 297       }
 298       applyopts_cloexec(ptyfd, popts);/*!*/
 299       /* exec:...,pty did not kill child process under some circumstances */
 300       if (fd->howtoend == END_UNSPEC) {
 301          fd->howtoend = END_CLOSE_KILL;
 302       }
 303
 304       /* this for parent, was after fork */
 305       applyopts(ptyfd, popts, PH_FD);
 306       applyopts(ptyfd, popts, PH_LATE);
 307       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 308
 309       fd->fd = ptyfd;
 310
 311       /* this for child, was after fork */
 312       applyopts(ttyfd, *copts, PH_FD);
 313    } else
 314 #endif /* HAVE_PTY */
 315    if (usepipes) {
 316       struct opt *popts2, *copts2;
 317
 318       if (rw == XIO_RDWR)
 319          fd->dtype = XIODATA_2PIPE;
 320       if (rw != XIO_WRONLY) {
 321          if (Pipe(rdpip) < 0) {
 322             Error2("pipe(%p): %s", rdpip, strerror(errno));
 323             return -1;
 324          }
 325       }
 326       /*0 Info2("pipe({%d,%d})", rdpip[0], rdpip[1]);*/
 327       /* rdpip[0]: read by socat; rdpip[1]: write by child */
 328       free(*copts);
 329       if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS))
 330           == NULL) {
 331          return -1;
 332       }
 333
 334       popts2 = copyopts(popts, GROUP_ALL);
 335       copts2 = copyopts(*copts, GROUP_ALL);
 336
 337       if (rw != XIO_WRONLY) {
 338          applyopts_cloexec(rdpip[0], popts);
 339          applyopts(rdpip[0], popts, PH_FD);
 340          applyopts(rdpip[1], *copts, PH_FD);
 341       }
 342
 343       if (rw != XIO_RDONLY) {
 344          if (Pipe(wrpip) < 0) {
 345             Error2("pipe(%p): %s", wrpip, strerror(errno));
 346             return -1;
 347          }
 348       }
 349       /*0 Info2("pipe({%d,%d})", wrpip[0], wrpip[1]);*/
 350
 351       /* wrpip[1]: write by socat; wrpip[0]: read by child */
 352       if (rw != XIO_RDONLY) {
 353          applyopts_cloexec(wrpip[1], popts2);
 354          applyopts(wrpip[1], popts2, PH_FD);
 355          applyopts(wrpip[0], copts2, PH_FD);
 356       }
 357       if (fd->howtoend == END_UNSPEC) {
 358          fd->howtoend = END_CLOSE_KILL;
 359       }
 360
 361       /* this for parent, was after fork */
 362       switch (rw) {
 363       case XIO_RDONLY: fd->fd = rdpip[0]; break;
 364       case XIO_WRONLY: fd->fd = wrpip[1]; break;
 365       case XIO_RDWR:   fd->fd = rdpip[0];
 366          fd->para.exec.fdout = wrpip[1];
 367          break;
 368       }
 369       applyopts(fd->fd, popts, PH_FD);
 370       applyopts(fd->fd, popts, PH_LATE);
 371       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 372    } else {
 373       d = AF_UNIX;
 374       retropt_int(popts, OPT_PROTOCOL_FAMILY, &d);
 375       result = xiosocketpair(popts, d, SOCK_STREAM, 0, sv);
 376       if (result < 0) {
 377          return -1;
 378       }
 379       /*0 Info5("socketpair(%d, %d, %d, {%d,%d})",
 380         d, type, protocol, sv[0], sv[1]);*/
 381       free(*copts);
 382       if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
 383          return -1;
 384       }
 385       applyopts(sv[0], *copts, PH_PASTSOCKET);
 386       applyopts(sv[1], popts, PH_PASTSOCKET);
 387
 388       applyopts_cloexec(sv[0], *copts);
 389       applyopts(sv[0], *copts, PH_FD);
 390       applyopts(sv[1], popts, PH_FD);
 391
 392       applyopts(sv[0], *copts, PH_PREBIND);
 393       applyopts(sv[0], *copts, PH_BIND);
 394       applyopts(sv[0], *copts, PH_PASTBIND);
 395       applyopts(sv[1], popts, PH_PREBIND);
 396       applyopts(sv[1], popts, PH_BIND);
 397       applyopts(sv[1], popts, PH_PASTBIND);
 398
 399       if (fd->howtoend == END_UNSPEC) {
 400          fd->howtoend = END_SHUTDOWN_KILL;
 401       }
 402
 403       /* this for parent, was after fork */
 404       fd->fd = sv[0];
 405       applyopts(fd->fd, popts, PH_FD);
 406       applyopts(fd->fd, popts, PH_LATE);
 407       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 408    }
 409    /*0   if ((optpr = copyopts(*copts, GROUP_PROCESS)) == NULL)
 410      return -1;*/
 411    retropt_bool(*copts, OPT_STDERR, &withstderr);
 412
 413    xiosetchilddied();   /* set SIGCHLD handler */
 414
 415    if (withfork) {
 416       pid = xio_fork(true, E_ERROR);
 417       if (pid < 0) {
 418          return -1;
 419       }
 420    }
 421    if (!withfork || pid == 0) { /* child */
 422       uid_t user;
 423       gid_t group;
 424
 425       if (withfork) {
 426          /* The child should have default handling for SIGCHLD. */
 427          /* In particular, it's not defined whether ignoring SIGCHLD is inheritable. */
 428          if (Signal(SIGCHLD, SIG_DFL) == SIG_ERR) {
 429             Warn1("signal(SIGCHLD, SIG_DFL): %s", strerror(errno));
 430          }
 431
 432 #if HAVE_PTY
 433          if (usepty) {
 434             Close(ptyfd);
 435             if (rw != XIO_RDONLY && fdi != ttyfd) {
 436                if (Dup2(ttyfd, fdi) < 0) {
 437                   Error3("dup2(%d, %d): %s", ttyfd, fdi, strerror(errno));
 438                   return -1; }
 439                /*0 Info2("dup2(%d, %d)", ttyfd, fdi);*/
 440             }
 441             if (rw != XIO_WRONLY && fdo != ttyfd) {
 442                if (Dup2(ttyfd, fdo) < 0) {
 443                   Error3("dup2(%d, %d): %s", ttyfd, fdo, strerror(errno));
 444                   return -1; }
 445                /*0 Info2("dup2(%d, %d)", ttyfd, fdo);*/
 446             }
 447             if ((rw == XIO_RDONLY || fdi != ttyfd) &&
 448                 (rw == XIO_WRONLY || fdo != ttyfd)) {
 449                applyopts_cloexec(ttyfd, *copts);
 450             }
 451
 452             applyopts(ttyfd, *copts, PH_LATE);
 453
 454             applyopts(ttyfd, *copts, PH_LATE2);
 455          } else
 456 #endif /* HAVE_PTY */
 457             if (usepipes) {
 458                /* we might have a temporary conflict between what FDs are
 459                   currently allocated, and which are to be used. We try to find
 460                   a graceful solution via temporary descriptors */
 461                int tmpi, tmpo;
 462
 463                if (rw != XIO_WRONLY)  Close(rdpip[0]);
 464                if (rw != XIO_RDONLY)  Close(wrpip[1]);
 465                if (fdi == rdpip[1]) {   /* a conflict here */
 466                   if ((tmpi = Dup(wrpip[0])) < 0) {
 467                      Error2("dup(%d): %s", wrpip[0], strerror(errno));
 468                      return -1;
 469                   }
 470                   /*0 Info2("dup(%d) -> %d", wrpip[0], tmpi);*/
 471                   rdpip[1] = tmpi;
 472                }
 473                if (fdo == wrpip[0]) {   /* a conflict here */
 474                   if ((tmpo = Dup(rdpip[1])) < 0) {
 475                      Error2("dup(%d): %s", rdpip[1], strerror(errno));
 476                      return -1;
 477                   }
 478                   /*0 Info2("dup(%d) -> %d", rdpip[1], tmpo);*/
 479                   wrpip[0] = tmpo;
 480                }
 481
 482                if (rw != XIO_WRONLY && rdpip[1] != fdo) {
 483                   if (Dup2(rdpip[1], fdo) < 0) {
 484                      Error3("dup2(%d, %d): %s", rdpip[1], fdo, strerror(errno));
 485                      return -1;
 486                   }
 487                   Close(rdpip[1]);
 488                   /*0 Info2("dup2(%d, %d)", rdpip[1], fdo);*/
 489                   /*0 applyopts_cloexec(fdo, *copts);*/
 490                }
 491                if (rw != XIO_RDONLY && wrpip[0] != fdi) {
 492                   if (Dup2(wrpip[0], fdi) < 0) {
 493                      Error3("dup2(%d, %d): %s", wrpip[0], fdi, strerror(errno));
 494                      return -1;
 495                   }
 496                   Close(wrpip[0]);
 497                   /*0 Info2("dup2(%d, %d)", wrpip[0], fdi);*/
 498                   /*0 applyopts_cloexec(wrpip[0], *copts);*/    /* option is already consumed! */
 499                   /* applyopts_cloexec(fdi, *copts);*/  /* option is already consumed! */
 500                }
 501
 502                applyopts(fdi, *copts, PH_LATE);
 503                applyopts(fdo, *copts, PH_LATE);
 504                applyopts(fdi, *copts, PH_LATE2);
 505                applyopts(fdo, *copts, PH_LATE2);
 506
 507             } else {    /* socketpair */
 508                Close(sv[0]);
 509                if (rw != XIO_RDONLY && fdi != sv[1]) {
 510                   if (Dup2(sv[1], fdi) < 0) {
 511                      Error3("dup2(%d, %d): %s", sv[1], fdi, strerror(errno));
 512                      return -1; }
 513                   /*0 Info2("dup2(%d, %d)", sv[1], fdi);*/
 514                }
 515                if (rw != XIO_WRONLY && fdo != sv[1]) {
 516                   if (Dup2(sv[1], fdo) < 0) {
 517                      Error3("dup2(%d, %d): %s", sv[1], fdo, strerror(errno));
 518                      return -1; }
 519                   /*0 Info2("dup2(%d, %d)", sv[1], fdo);*/
 520                }
 521                if (fdi != sv[1] && fdo != sv[1]) {
 522                   applyopts_cloexec(sv[1], *copts);
 523                   Close(sv[1]);
 524                }
 525
 526                applyopts(fdi, *copts, PH_LATE);
 527                applyopts(fdi, *copts, PH_LATE2);
 528             }
 529       } /* withfork */
 530       else {
 531          applyopts(-1, *copts, PH_LATE);
 532          applyopts(-1, *copts, PH_LATE2);
 533       }
 534       _xioopen_setdelayeduser();
 535       /* set group before user - maybe you are not permitted afterwards */
 536       if (retropt_gidt(*copts, OPT_SETGID, &group) >= 0) {
 537          Setgid(group);
 538       }
 539       if (retropt_uidt(*copts, OPT_SETUID, &user) >= 0) {
 540          Setuid(user);
 541       }
 542       if (withstderr) {
 543          *duptostderr = fdo;
 544       } else {
 545          *duptostderr = -1;
 546       }
 547
 548       return 0; /* indicate child process */
 549    }
 550
 551    /* for parent (this is our socat process) */
 552    Notice1("forked off child process "F_pid, pid);
 553
 554 #if 0
 555    if ((popts = copyopts(*copts,
 556                          GROUP_FD|GROUP_TERMIOS|GROUP_FORK|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_FIFO)) == NULL)
 557       return STAT_RETRYLATER;
 558 #endif
 559
 560 #if HAVE_PTY
 561    if (usepty) {
 562       if (Close(ttyfd) < 0) {
 563          Info2("close(%d): %s", ttyfd, strerror(errno));
 564       }
 565    } else
 566 #endif /* HAVE_PTY */
 567    if (usepipes) {
 568       if (rw == XIO_RDONLY)  Close(rdpip[1]);
 569       if (rw == XIO_WRONLY)  Close(wrpip[0]);
 570    } else {
 571       Close(sv[1]);
 572    }
 573    fd->para.exec.pid = pid;
 574
 575    if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 576    applyopts_signal(fd, popts);
 577    if ((numleft = leftopts(popts)) > 0) {
 578       Error1("%d option(s) could not be used", numleft);
 579       showleft(popts);
 580       return STAT_NORETRY;
 581    }
 582
 583    return pid;  /* indicate parent (main) process */
 584 }
 585 #endif /* WITH_EXEC || WITH_SYSTEM */
 586
 587
 588 int setopt_path(struct opt *opts, char **path) {
 589    if (retropt_string(opts, OPT_PATH, path) >= 0) {
 590       if (setenv("PATH", *path, 1) < 0) {
 591          Error1("setenv(\"PATH\", \"%s\", 1): insufficient space", *path);
 592          return -1;
 593       }
 594    }
 595    return 0;
 596 }