Usenet 1994 January/usenetsourcesnewsgroupsinfomagicjanuary1994.iso/sources/misc/volume22/cdmount/part01/cdmount.c

C/C++ Source or Header | 1991-08-17 | 5.1 KB | 169 lines

/*
**  Subsystem:   User Level mount for CD-ROM
**  File Name:   cdmount.c
**
** This software is Copyright (c) 1991 by Kent Landfield.
**
** Permission is hereby granted to copy, distribute or otherwise
** use any part of this package as long as you do not try to make
** money from it or pretend that you wrote it.  This copyright
** notice must be maintained in any copy made.
**
** Use of this software constitutes acceptance for use in an AS IS
** condition. There are NO warranties with regard to this software.
** In no event shall the author be liable for any damages whatsoever
** arising out of or in connection with the use or performance of this
** software.  Any use of this software is at the user's own risk.
**
**  If you make modifications to this software that you feel
**  increases it usefulness for the rest of the community, please
**  email the changes, enhancements, bug fixes as well as any and
**  all ideas to me. This software is going to be maintained and
**  enhanced as deemed necessary by the community.
**
**              Kent Landfield
**              sparky!kent
**              [e-mail]
*/
#if !defined(lint) && !defined(SABER)
static char SID[] = "@(#)cdmount.c    1.1 8/17/91";
#endif

#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>

void usage(progname)
char *progname;
{
    (void) fprintf(stderr, "\nusage: %s [ -dhnv ] [ -m mountpoint ]\
\n\noptions:\n\
      -d   show the mount command without executing it\n\
      -h   mount an ISO 9660 or High Sierra CD_ROM Filesystem\n\
      -n   no setuid execution allowed\n\
      -v   show the mount command and execute it\n\
\n\
      -m mountpoint\n\
           mount the cd at another location than the default\n\
           location of /cdrom\n\
\n", progname);
}

int main(argc, argv)
int argc;
char **argv;
{
    int getopt();
    char *strrchr();

    extern char *optarg;
    extern int optind;
    extern int opterr;

    char *cp;
    char *mntpoint;
    char cmd[256];
    int rc;
    int debug;
    int nosuid;
    int iso9660;
    struct stat stb;

    if ((cp = strrchr(argv[0],'/')) != NULL)
        ++cp;
    else
        cp = argv[0];

    /*
    ** Setup IFS for system() protection...
    */
    if (putenv("IFS= \t\n") != 0) {
         (void) fprintf(stderr,"%s: putenv failed...\n", cp);
         return(1);
    }

    /*
    ** If the user is requesting to mount a CD..
    */
    if (strcmp(cp, "cdmount") == 0) {
        mntpoint = "/cdrom";
        nosuid = 0;
        iso9660 = 0;
        opterr = 0;
        debug = 0;

        if (argc > 1) {
           while ((rc = getopt(argc, argv, "dnhvm:")) != EOF) {
              switch (rc) {
                  case 'd':     /* debugging - does not run command. */
                      debug = 1;
                      break;
                  case 'v':     /* verbose - runs command. */
                      debug = 2;
                      break;
                  case 'n':
                      /*
                      ** No setuid executables
                      */
                      nosuid++;
                      break;
                  case 'h':
                      /*
                      ** mount an ISO 9660 Standard or High
                      ** Sierra Standard CD-ROM filesystem.
                      */
                      iso9660++;
                      break;
                  case 'm':
                      /*
                      ** get the optional mount point with
                      ** minimual checking for sanity..
                      */
                      mntpoint = optarg;
                      if (stat(mntpoint, &stb) != 0) {
                          (void) fprintf(stderr, "%s: mount point missing\n",
                                                  mntpoint);
                          return(1);
                      }
                      if ((stb.st_mode & S_IFMT) != S_IFDIR) {
                          (void) fprintf(stderr, "%s: invalid mount point\n",
                                                  mntpoint);
                          return(1);
                      }
                      break;
                  default:
                      usage(cp);
                      return(1);
              }
           }
        }

        /* build the command line.. */

        (void) sprintf(cmd, "/etc/mount -r %s %s /dev/sr0 %s",
                       iso9660 ? "-t hsfs" : "",
                        nosuid ? "-o nosuid" : "",
                        mntpoint);
        if (debug)
            (void) fprintf(stderr, "%s\n", cmd);
        if (debug != 1)
            rc = system(cmd);
    }

    /*
    ** The user is requesting to dismount a CD...
    */
    else if (strcmp(cp, "cdumount") == 0) {
        rc = system("/etc/umount /dev/sr0 && /usr/bin/eject /dev/sr0 2>/dev/null");
    }

    /*
    ** Improperly named/linked executables, I'm confused...
    */
    else {
        (void) fprintf(stderr, "%s: I don't know who I am... ? \n", cp);
        rc = 1;
    }
    return(rc >> 8);
}