xio-progcall.c

   1 /* source: xio-progcall.c */
   2 /* Copyright Gerhard Rieger 2001-2009 */
   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    retropt_ushort(popts, OPT_FDIN,  (unsigned short *)&fdi);
 107    retropt_ushort(popts, OPT_FDOUT, (unsigned short *)&fdo);
 108
 109    if (withfork) {
 110       if (!(xioflags&XIO_MAYCHILD)) {
 111          Error("cannot fork off child process here");
 112          /*!! free something */
 113          return -1;
 114       }
 115       fd->flags |= XIO_DOESCHILD;
 116
 117 #if HAVE_PTY
 118       Notice2("forking off child, using %s for %s",
 119             &("socket\0\0pipes\0\0\0pty\0\0\0\0\0"[(usepipes<<3)|(usepty<<4)]),
 120               ddirection[rw]);
 121 #else
 122       Notice2("forking off child, using %s for %s",
 123               &("socket\0\0pipes\0\0\0"[(usepipes<<3)]),
 124               ddirection[rw]);
 125 #endif /* HAVE_PTY */
 126    }
 127    applyopts(-1, popts, PH_PREBIGEN);
 128
 129    if (!withfork) {
 130       /*0 struct single *stream1, *stream2;*/
 131
 132       if (!(xioflags & XIO_MAYEXEC /* means exec+nofork */)) {
 133          Error("option nofork is not allowed here");
 134          /*!! free something */
 135          return -1;
 136       }
 137       fd->flags |= XIO_DOESEXEC;
 138
 139       free(*copts);
 140       *copts = moveopts(popts, GROUP_ALL);
 141
 142 #if 0 /*!! */
 143       if (sock1->tag == XIO_TAG_DUAL) {
 144          stream1 = &sock1->dual.stream[0]->stream;
 145          stream2 = &sock1->dual.stream[1]->stream;
 146       } else {
 147          stream1 = &sock1->stream;
 148          stream2 = &sock1->stream;
 149       }
 150       if (stream1->dtype == DATA_READLINE || stream2->dtype == DATA_READLINE ||
 151           stream1->dtype == DATA_OPENSSL  || stream2->dtype == DATA_OPENSSL
 152           ) {
 153          Error("with option nofork, openssl and readline in address1 do not work");
 154       }
 155       if (stream1->lineterm != LINETERM_RAW ||
 156           stream2->lineterm != LINETERM_RAW ||
 157           stream1->ignoreeof || stream2->ignoreeof) {
 158          Warn("due to option nofork, address1 options for lineterm and igoreeof do not apply");
 159       }
 160 #endif
 161
 162       /*! problem: when fdi==WRFD(sock[0]) or fdo==RDFD(sock[0]) */
 163       if (rw != XIO_WRONLY) {
 164          if (XIO_GETRDFD(sock[0]/*!!*/) == fdi) {
 165             if (Fcntl_l(fdi, F_SETFD, 0) < 0) {
 166                Warn2("fcntl(%d, F_SETFD, 0): %s", fdi, strerror(errno));
 167             }
 168             if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
 169                Error3("dup2(%d, %d): %s",
 170                       XIO_GETRDFD(sock[0]), fdi, strerror(errno));
 171             }
 172             /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
 173          } else {
 174             if (Dup2(XIO_GETRDFD(sock[0]), fdi) < 0) {
 175                Error3("dup2(%d, %d): %s",
 176                       XIO_GETRDFD(sock[0]), fdi, strerror(errno));
 177             }
 178             /*0 Info2("dup2(%d, %d)", XIO_GETRDFD(sock[0]), fdi);*/
 179          }
 180       }
 181       if (rw != XIO_RDONLY) {
 182          if (XIO_GETWRFD(sock[0]) == fdo) {
 183             if (Fcntl_l(fdo, F_SETFD, 0) < 0) {
 184                Warn2("fcntl(%d, F_SETFD, 0): %s", fdo, strerror(errno));
 185             }
 186             if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
 187                Error3("dup2(%d, %d): %s)",
 188                       XIO_GETWRFD(sock[0]), fdo, strerror(errno));
 189             }
 190             /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 191          } else {
 192             if (Dup2(XIO_GETWRFD(sock[0]), fdo) < 0) {
 193                Error3("dup2(%d, %d): %s)",
 194                       XIO_GETWRFD(sock[0]), fdo, strerror(errno));
 195             }
 196             /*0 Info2("dup2(%d, %d)", XIO_GETWRFD(sock[0]), fdo);*/
 197          }
 198       }
 199    } else
 200 #if HAVE_PTY
 201    if (usepty) {
 202
 203 #if defined(HAVE_DEV_PTMX)
 204 #  define PTMX "/dev/ptmx"      /* Linux */
 205 #elif HAVE_DEV_PTC
 206 #  define PTMX "/dev/ptc"       /* AIX 4.3.3 */
 207 #endif
 208       fd->dtype = XIODATA_PTY;
 209 #if HAVE_DEV_PTMX || HAVE_DEV_PTC
 210       if (usebestpty || useptmx) {
 211          if ((ptyfd = Open(PTMX, O_RDWR|O_NOCTTY, 0620)) < 0) {
 212             Warn1("open(\""PTMX"\", O_RDWR|O_NOCTTY, 0620): %s",
 213                   strerror(errno));
 214             /*!*/
 215          } else {
 216             /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", PTMX, ptyfd);*/
 217          }
 218          if (ptyfd >= 0 && ttyfd < 0) {
 219             char *tn = NULL;
 220             /* we used PTMX before forking */
 221             extern char *ptsname(int);
 222 #if HAVE_GRANTPT        /* AIX, not Linux */
 223             if (Grantpt(ptyfd)/*!*/ < 0) {
 224                Warn2("grantpt(%d): %s", ptyfd, strerror(errno));
 225             }
 226 #endif /* HAVE_GRANTPT */
 227 #if HAVE_UNLOCKPT
 228             if (Unlockpt(ptyfd)/*!*/ < 0) {
 229                Warn2("unlockpt(%d): %s", ptyfd, strerror(errno));
 230             }
 231 #endif /* HAVE_UNLOCKPT */
 232 #if HAVE_PTSNAME        /* AIX, not Linux */
 233             if ((tn = Ptsname(ptyfd)) == NULL) {
 234                Warn2("ptsname(%d): %s", ptyfd, strerror(errno));
 235             }
 236 #endif /* HAVE_PTSNAME */
 237             if (tn == NULL) {
 238                if ((tn = Ttyname(ptyfd)) == NULL) {
 239                   Warn2("ttyname(%d): %s", ptyfd, strerror(errno));
 240                }
 241             }
 242             strncpy(ptyname, tn, MAXPTYNAMELEN);
 243             if ((ttyfd = Open(tn, O_RDWR|O_NOCTTY, 0620)) < 0) {
 244                Warn2("open(\"%s\", O_RDWR|O_NOCTTY, 0620): %s", tn, strerror(errno));
 245             } else {
 246                /*0 Info2("open(\"%s\", O_RDWR|O_NOCTTY, 0620) -> %d", tn, ttyfd);*/
 247             }
 248
 249 #ifdef I_PUSH
 250             /* Linux: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> -1 EINVAL */
 251             /* AIX:   I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 1 */
 252             /* SunOS: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
 253             /* HP-UX: I_PUSH def'd; pty: ioctl(, I_FIND, ...) -> 0 */
 254             if (Ioctl(ttyfd, I_FIND, "ldterm") == 0) {
 255                Ioctl(ttyfd, I_PUSH, "ptem");            /* 0 */
 256                Ioctl(ttyfd, I_PUSH, "ldterm");          /* 0 */
 257                Ioctl(ttyfd, I_PUSH, "ttcompat");        /* HP-UX: -1 */
 258             }
 259 #endif
 260
 261 #if 0       /* the following block need not work */
 262
 263             if (ttyfd >= 0 && ((tn = Ttyname(ttyfd)) == NULL)) {
 264                Warn2("ttyname(%d): %s", ttyfd, strerror(errno));
 265             }
 266             if (tn == NULL) {
 267                Error("could not open pty");
 268                return -1;
 269             }
 270 #endif
 271             Info1("opened pseudo terminal %s", tn);
 272          }
 273       }
 274 #endif /* HAVE_DEV_PTMX || HAVE_DEV_PTC */
 275 #if HAVE_OPENPTY
 276       if (ptyfd < 0) {
 277          int result;
 278          if ((result = Openpty(&ptyfd, &ttyfd, ptyname, NULL, NULL)) < 0) {
 279             Error4("openpty(%p, %p, %p, NULL, NULL): %s",
 280                    &ptyfd, &ttyfd, ptyname, strerror(errno));
 281             return -1;
 282          }
 283       }
 284 #endif /* HAVE_OPENPTY */
 285       free(*copts);
 286       if ((*copts = moveopts(popts, GROUP_TERMIOS|GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
 287          return -1;
 288       }
 289       applyopts_cloexec(ptyfd, popts);/*!*/
 290       /* exec:...,pty did not kill child process under some circumstances */
 291       if (fd->howtoend == END_UNSPEC) {
 292          fd->howtoend = END_CLOSE_KILL;
 293       }
 294
 295       /* this for parent, was after fork */
 296       applyopts(ptyfd, popts, PH_FD);
 297       applyopts(ptyfd, popts, PH_LATE);
 298       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 299
 300       fd->fd = ptyfd;
 301
 302       /* this for child, was after fork */
 303       applyopts(ttyfd, *copts, PH_FD);
 304    } else
 305 #endif /* HAVE_PTY */
 306    if (usepipes) {
 307       struct opt *popts2, *copts2;
 308
 309       if (rw == XIO_RDWR)
 310          fd->dtype = XIODATA_2PIPE;
 311       if (rw != XIO_WRONLY) {
 312          if (Pipe(rdpip) < 0) {
 313             Error2("pipe(%p): %s", rdpip, strerror(errno));
 314             return -1;
 315          }
 316       }
 317       /*0 Info2("pipe({%d,%d})", rdpip[0], rdpip[1]);*/
 318       /* rdpip[0]: read by socat; rdpip[1]: write by child */
 319       free(*copts);
 320       if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS))
 321           == NULL) {
 322          return -1;
 323       }
 324
 325       popts2 = copyopts(popts, GROUP_ALL);
 326       copts2 = copyopts(*copts, GROUP_ALL);
 327
 328       if (rw != XIO_WRONLY) {
 329          applyopts_cloexec(rdpip[0], popts);
 330          applyopts(rdpip[0], popts, PH_FD);
 331          applyopts(rdpip[1], *copts, PH_FD);
 332       }
 333
 334       if (rw != XIO_RDONLY) {
 335          if (Pipe(wrpip) < 0) {
 336             Error2("pipe(%p): %s", wrpip, strerror(errno));
 337             return -1;
 338          }
 339       }
 340       /*0 Info2("pipe({%d,%d})", wrpip[0], wrpip[1]);*/
 341
 342       /* wrpip[1]: write by socat; wrpip[0]: read by child */
 343       if (rw != XIO_RDONLY) {
 344          applyopts_cloexec(wrpip[1], popts2);
 345          applyopts(wrpip[1], popts2, PH_FD);
 346          applyopts(wrpip[0], copts2, PH_FD);
 347       }
 348       if (fd->howtoend == END_UNSPEC) {
 349          fd->howtoend = END_CLOSE_KILL;
 350       }
 351
 352       /* this for parent, was after fork */
 353       switch (rw) {
 354       case XIO_RDONLY: fd->fd = rdpip[0]; break;
 355       case XIO_WRONLY: fd->fd = wrpip[1]; break;
 356       case XIO_RDWR:   fd->fd = rdpip[0];
 357          fd->para.exec.fdout = wrpip[1];
 358          break;
 359       }
 360       applyopts(fd->fd, popts, PH_FD);
 361       applyopts(fd->fd, popts, PH_LATE);
 362       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 363    } else {
 364       d = AF_UNIX;
 365       retropt_int(popts, OPT_PROTOCOL_FAMILY, &d);
 366       result = xiosocketpair(popts, d, SOCK_STREAM, 0, sv);
 367       if (result < 0) {
 368          return -1;
 369       }
 370       /*0 Info5("socketpair(%d, %d, %d, {%d,%d})",
 371         d, type, protocol, sv[0], sv[1]);*/
 372       free(*copts);
 373       if ((*copts = moveopts(popts, GROUP_FORK|GROUP_EXEC|GROUP_PROCESS)) == NULL) {
 374          return -1;
 375       }
 376       applyopts(sv[0], *copts, PH_PASTSOCKET);
 377       applyopts(sv[1], popts, PH_PASTSOCKET);
 378
 379       applyopts_cloexec(sv[0], *copts);
 380       applyopts(sv[0], *copts, PH_FD);
 381       applyopts(sv[1], popts, PH_FD);
 382
 383       applyopts(sv[0], *copts, PH_PREBIND);
 384       applyopts(sv[0], *copts, PH_BIND);
 385       applyopts(sv[0], *copts, PH_PASTBIND);
 386       applyopts(sv[1], popts, PH_PREBIND);
 387       applyopts(sv[1], popts, PH_BIND);
 388       applyopts(sv[1], popts, PH_PASTBIND);
 389
 390       if (fd->howtoend == END_UNSPEC) {
 391          fd->howtoend = END_SHUTDOWN_KILL;
 392       }
 393
 394       /* this for parent, was after fork */
 395       fd->fd = sv[0];
 396       applyopts(fd->fd, popts, PH_FD);
 397       applyopts(fd->fd, popts, PH_LATE);
 398       if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 399    }
 400    /*0   if ((optpr = copyopts(*copts, GROUP_PROCESS)) == NULL)
 401      return -1;*/
 402    retropt_bool(*copts, OPT_STDERR, &withstderr);
 403
 404    xiosetchilddied();   /* set SIGCHLD handler */
 405
 406    if (withfork) {
 407       pid = xio_fork(true, E_ERROR);
 408       if (pid < 0) {
 409          return -1;
 410       }
 411    }
 412    if (!withfork || pid == 0) { /* child */
 413       uid_t user;
 414       gid_t group;
 415
 416       if (withfork) {
 417          if (Signal(SIGCHLD, SIG_IGN) == SIG_ERR) {
 418             Warn1("signal(SIGCHLD, SIG_IGN): %s", strerror(errno));
 419          }
 420
 421 #if HAVE_PTY
 422          if (usepty) {
 423             Close(ptyfd);
 424             if (rw != XIO_RDONLY && fdi != ttyfd) {
 425                if (Dup2(ttyfd, fdi) < 0) {
 426                   Error3("dup2(%d, %d): %s", ttyfd, fdi, strerror(errno));
 427                   return -1; }
 428                /*0 Info2("dup2(%d, %d)", ttyfd, fdi);*/
 429             }
 430             if (rw != XIO_WRONLY && fdo != ttyfd) {
 431                if (Dup2(ttyfd, fdo) < 0) {
 432                   Error3("dup2(%d, %d): %s", ttyfd, fdo, strerror(errno));
 433                   return -1; }
 434                /*0 Info2("dup2(%d, %d)", ttyfd, fdo);*/
 435             }
 436             if ((rw == XIO_RDONLY || fdi != ttyfd) &&
 437                 (rw == XIO_WRONLY || fdo != ttyfd)) {
 438                applyopts_cloexec(ttyfd, *copts);
 439             }
 440
 441             applyopts(ttyfd, *copts, PH_LATE);
 442
 443             applyopts(ttyfd, *copts, PH_LATE2);
 444          } else
 445 #endif /* HAVE_PTY */
 446             if (usepipes) {
 447                /* we might have a temporary conflict between what FDs are
 448                   currently allocated, and which are to be used. We try to find
 449                   a graceful solution via temporary descriptors */
 450                int tmpi, tmpo;
 451
 452                if (rw != XIO_WRONLY)  Close(rdpip[0]);
 453                if (rw != XIO_RDONLY)  Close(wrpip[1]);
 454                if (fdi == rdpip[1]) {   /* a conflict here */
 455                   if ((tmpi = Dup(wrpip[0])) < 0) {
 456                      Error2("dup(%d): %s", wrpip[0], strerror(errno));
 457                      return -1;
 458                   }
 459                   /*0 Info2("dup(%d) -> %d", wrpip[0], tmpi);*/
 460                   rdpip[1] = tmpi;
 461                }
 462                if (fdo == wrpip[0]) {   /* a conflict here */
 463                   if ((tmpo = Dup(rdpip[1])) < 0) {
 464                      Error2("dup(%d): %s", rdpip[1], strerror(errno));
 465                      return -1;
 466                   }
 467                   /*0 Info2("dup(%d) -> %d", rdpip[1], tmpo);*/
 468                   wrpip[0] = tmpo;
 469                }
 470
 471                if (rw != XIO_WRONLY && rdpip[1] != fdo) {
 472                   if (Dup2(rdpip[1], fdo) < 0) {
 473                      Error3("dup2(%d, %d): %s", rdpip[1], fdo, strerror(errno));
 474                      return -1;
 475                   }
 476                   Close(rdpip[1]);
 477                   /*0 Info2("dup2(%d, %d)", rdpip[1], fdo);*/
 478                   /*0 applyopts_cloexec(fdo, *copts);*/
 479                }
 480                if (rw != XIO_RDONLY && wrpip[0] != fdi) {
 481                   if (Dup2(wrpip[0], fdi) < 0) {
 482                      Error3("dup2(%d, %d): %s", wrpip[0], fdi, strerror(errno));
 483                      return -1;
 484                   }
 485                   Close(wrpip[0]);
 486                   /*0 Info2("dup2(%d, %d)", wrpip[0], fdi);*/
 487                   /*0 applyopts_cloexec(wrpip[0], *copts);*/    /* option is already consumed! */
 488                   /* applyopts_cloexec(fdi, *copts);*/  /* option is already consumed! */
 489                }
 490
 491                applyopts(fdi, *copts, PH_LATE);
 492                applyopts(fdo, *copts, PH_LATE);
 493                applyopts(fdi, *copts, PH_LATE2);
 494                applyopts(fdo, *copts, PH_LATE2);
 495
 496             } else {    /* socketpair */
 497                Close(sv[0]);
 498                if (rw != XIO_RDONLY && fdi != sv[1]) {
 499                   if (Dup2(sv[1], fdi) < 0) {
 500                      Error3("dup2(%d, %d): %s", sv[1], fdi, strerror(errno));
 501                      return -1; }
 502                   /*0 Info2("dup2(%d, %d)", sv[1], fdi);*/
 503                }
 504                if (rw != XIO_WRONLY && fdo != sv[1]) {
 505                   if (Dup2(sv[1], fdo) < 0) {
 506                      Error3("dup2(%d, %d): %s", sv[1], fdo, strerror(errno));
 507                      return -1; }
 508                   /*0 Info2("dup2(%d, %d)", sv[1], fdo);*/
 509                }
 510                if (fdi != sv[1] && fdo != sv[1]) {
 511                   applyopts_cloexec(sv[1], *copts);
 512                   Close(sv[1]);
 513                }
 514
 515                applyopts(fdi, *copts, PH_LATE);
 516                applyopts(fdi, *copts, PH_LATE2);
 517             }
 518       } /* withfork */
 519       else {
 520          applyopts(-1, *copts, PH_LATE);
 521          applyopts(-1, *copts, PH_LATE2);
 522       }
 523       _xioopen_setdelayeduser();
 524       /* set group before user - maybe you are not permitted afterwards */
 525       if (retropt_gidt(*copts, OPT_SETGID, &group) >= 0) {
 526          Setgid(group);
 527       }
 528       if (retropt_uidt(*copts, OPT_SETUID, &user) >= 0) {
 529          Setuid(user);
 530       }
 531       if (withstderr) {
 532          *duptostderr = fdo;
 533       } else {
 534          *duptostderr = -1;
 535       }
 536
 537       return 0; /* indicate child process */
 538    }
 539
 540    /* for parent (this is our socat process) */
 541    Notice1("forked off child process "F_pid, pid);
 542
 543 #if 0
 544    if ((popts = copyopts(*copts,
 545                          GROUP_FD|GROUP_TERMIOS|GROUP_FORK|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_FIFO)) == NULL)
 546       return STAT_RETRYLATER;
 547 #endif
 548
 549 #if HAVE_PTY
 550    if (usepty) {
 551       if (Close(ttyfd) < 0) {
 552          Info2("close(%d): %s", ttyfd, strerror(errno));
 553       }
 554    } else
 555 #endif /* HAVE_PTY */
 556    if (usepipes) {
 557       Close(rdpip[1]);
 558       Close(wrpip[0]);
 559    } else {
 560       Close(sv[1]);
 561    }
 562    fd->para.exec.pid = pid;
 563
 564    if (applyopts_single(fd, popts, PH_LATE) < 0)  return -1;
 565    applyopts_signal(fd, popts);
 566    if ((numleft = leftopts(popts)) > 0) {
 567       Error1("%d option(s) could not be used", numleft);
 568       showleft(popts);
 569       return STAT_NORETRY;
 570    }
 571
 572    return pid;  /* indicate parent (main) process */
 573 }
 574 #endif /* WITH_EXEC || WITH_SYSTEM */
 575
 576
 577 int setopt_path(struct opt *opts, char **path) {
 578    if (retropt_string(opts, OPT_PATH, path) >= 0) {
 579       if (setenv("PATH", *path, 1) < 0) {
 580          Error1("setenv(\"PATH\", \"%s\", 1): insufficient space", *path);
 581          return -1;
 582       }
 583    }
 584    return 0;
 585 }