xio-shell.c

   1 /* source: xio-shell.c */
   2 /* Copyright Gerhard Rieger and contributors (see file CHANGES) */
   3 /* Published under the GNU General Public License V.2, see file COPYING */
   4
   5 /* this file contains the source for opening addresses of shell type */
   6
   7 #include "xiosysincludes.h"
   8 #include "xioopen.h"
   9
  10 #include "xio-progcall.h"
  11 #include "xio-shell.h"
  12
  13
  14 #if WITH_SHELL
  15
  16 static int xioopen_shell(int arg, const char *argv[], struct opt *opts, int xioflags, xiofile_t *xfd, const struct addrdesc *addrdesc);
  17
  18 const struct addrdesc xioaddr_shell = { "SHELL", 3, xioopen_shell, GROUP_FD|GROUP_FORK|GROUP_EXEC|GROUP_SOCKET|GROUP_SOCK_UNIX|GROUP_TERMIOS|GROUP_FIFO|GROUP_PTY|GROUP_PARENT|GROUP_SHELL, 1, 0, 0 HELP(":<shell-command>") };
  19
  20 const struct optdesc opt_shell = { "shell", NULL, OPT_SHELL, GROUP_SHELL, PH_PREEXEC, TYPE_STRING, OFUNC_SPEC, 0, 0 };
  21
  22 static int xioopen_shell(
  23         int argc,
  24         const char *argv[],
  25         struct opt *opts,
  26         int xioflags,
  27         xiofile_t *xfd,
  28         const struct addrdesc *addrdesc)
  29 {
  30         struct single *sfd = &xfd->stream;
  31         int status;
  32         char *path = NULL;
  33         int duptostderr;
  34         int result;
  35         char *shellpath = NULL;
  36         const char *shellname;
  37         const char *string = argv[1];
  38
  39         if (argc != 2) {
  40                 xio_syntax(argv[0], 1, argc-1, addrdesc->syntax);
  41                 return STAT_NORETRY;
  42         }
  43
  44         shellpath = getenv("SHELL");
  45         retropt_string(opts, OPT_SHELL, &shellpath);
  46         if (shellpath == NULL) {
  47                 Error("SHELL variable undefined");
  48                 errno = EINVAL;
  49                 return -1;
  50         }
  51         shellname = strrchr(shellpath, '/');
  52         if (shellname == NULL) {
  53                 Error1("SHELL \"%s\" variable does not specify a path (has no '/')", shellpath);
  54                 errno = EINVAL;
  55                 return -1;
  56         }
  57         ++shellname;
  58
  59         status = _xioopen_foxec(xioflags, sfd, addrdesc->groups, &opts, &duptostderr);
  60         if (status < 0)  return status;
  61         if (status == 0) {      /* child */
  62                 int numleft;
  63
  64                 if (setopt_path(opts, &path) < 0) {
  65                         /* this could be dangerous, so let us abort this child... */
  66                         Exit(1);
  67                 }
  68
  69                 if ((numleft = leftopts(opts)) > 0) {
  70                         Error1("%d option(s) could not be used", numleft);
  71                         showleft(opts);
  72                         return STAT_NORETRY;
  73                 }
  74
  75                 /* only now redirect stderr */
  76                 if (duptostderr >= 0) {
  77                         diag_dup();
  78                         Dup2(duptostderr, 2);
  79                 }
  80
  81                 Setenv("SHELL", shellpath, 1);
  82
  83                 Info1("executing shell command \"%s\"", string);
  84                 Debug3("execl(\"%s\", \"%s\", \"-c\", \"%s\", NULL",
  85                        shellpath, shellname, string);
  86                 result = execl(shellpath, shellname, "-c", string, (char *)NULL);
  87                 if (result != 0) {
  88                         Warn2("execl(\"%s\") returned with status %d", string, result);
  89                         Warn1("execl(): %s", strerror(errno));
  90                 }
  91                 Exit(0);        /* this child process */
  92         }
  93
  94         /* parent */
  95         return 0;
  96 }
  97
  98 #endif /* WITH_SHELL */