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/* * jaztool.c -- * * Linux Tool for the Iomega Jaz Drive. * * This program uses SCSI_IOCTL_SEND_COMMAND to deliver vendor specific * commands to an Iomega JAZ drive. The program attempts to ensure that * the SCSI device is actually a JAZ drive and that it is not currently * mounted. The checks are *not* foolproof - but only root can do these * things anyway ! * * Usage: jaztool <dev> <command> * * where <dev> must be the full name of a scsi device, eg: /dev/sdc, note * that you must not specify a partition on the device. <command> can * be one of: * * eject ejects the disk in the drive * ro puts the disk into read-only mode, and ejects * rw puts the disk into read-write mode, and ejects * status prints the read/write status of the disk * * If the disk is in a password protected mode, you will be prompted for * a password when you attempt to change the mode. This version of * jaztool does not officially support putting the disk into the password * protected read-only mode, but the command 'PWRO' will do this if you * are really sure that you want to. REMEMBER: if you forget the password, * you will not be able to put the disk back into read-write mode. * * NOTE: The JAZ drive also supports a protection mode 5, under which the * disk is neither readable nor writable until it is unlocked with a * password. This program cannot unlock a disk in mode 5 - as Linux is * unable to open a disk that is not readable. To support this feature * would require patching the Linux kernel. (And therefore, there is no * command to put a disk into this mode, either.) * * Whenever you change the write-protection mode, jaztool ejects the disk. * This is done to ensure that Linux will recheck the mode before it attempts * to use the disk again. * * * (c) 1996 - Bob Willmot * bwillmot@cnct.com * http://www.cnct.com/~bwillmot/ * * adapted from work for the Iomega Zip by Grant R. Guenther * and Itai Nahshon * */ static char rcsid[] = "$Id: jaztool.c,v 1.3 1996/07/27 16:30:45 root Exp $"; #include <stdio.h> #include <mntent.h> /* * this is ugly and should not be here - but the SCSI include files are * moving around ... */ #define SCSI_IOCTL_SEND_COMMAND 1 struct sdata { int inlen; int outlen; char cmd[256]; } scsi_cmd; /* *---------------------------------------------------------------------- * * error -- * * print error and exit * * Results: * None. * * Side effects: * exits program with errorlevel 1 * *---------------------------------------------------------------------- */ void error(char * msg) { printf("jaztool: %s\n",msg); exit(1); } /* *---------------------------------------------------------------------- * * is_mounted -- * * determine if the disk is mounted * * Results: * -1 = error, 0 = not mounted, 1 = mounted * * Side effects: * None. * *---------------------------------------------------------------------- */ int is_mounted( char * fs ) { struct mntent *mp; FILE *mtab; mtab = setmntent("/etc/mtab","r"); if (!mtab) return -1; while (mp=getmntent(mtab)) if (!strncmp(mp->mnt_fsname,fs,8)) break; endmntent(mtab); return (mp != NULL); } /* *---------------------------------------------------------------------- * * is_raw_scsi -- * * determine if the given device is a raw SCSI device * * Results: * 1 = true * * Side effects: * None. * *---------------------------------------------------------------------- */ int is_raw_scsi( char * fs ) { return ((strlen(fs) == 8) && (strncmp("/dev/sd",fs,7) == 0)); } /* *---------------------------------------------------------------------- * * is_jaz -- * * determine if device is a Jaz * * Results: * 1 = true * * Side effects: * None. * *---------------------------------------------------------------------- */ int is_jaz( int fd ) { char id[25]; int i; scsi_cmd.inlen = 0; scsi_cmd.outlen = 40; scsi_cmd.cmd[0] = 0x12; /* inquiry */ scsi_cmd.cmd[1] = 0; scsi_cmd.cmd[2] = 0; scsi_cmd.cmd[3] = 0; scsi_cmd.cmd[4] = 40; scsi_cmd.cmd[5] = 0; if (ioctl(fd,SCSI_IOCTL_SEND_COMMAND,(void *)&scsi_cmd)) error("inquiry ioctl error"); for(i=0;i<24;i++) { id[i] = scsi_cmd.cmd[i+8]; } id[24] = 0; /* * compare the string case insensitive * just in case Iomega changes the * BIOS information of future drives */ return(!strncasecmp(id,"IOMEGA JAZ 1GB",15)); } /* *---------------------------------------------------------------------- * * motor -- * * use SCSI_IOCTL_SEND_COMMAND to send a command to the scsi device * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void motor( int fd, int mode ) { scsi_cmd.inlen = 0; scsi_cmd.outlen = 0; scsi_cmd.cmd[0] = 0x1b; /* start/stop */ scsi_cmd.cmd[1] = 0; scsi_cmd.cmd[2] = 0; scsi_cmd.cmd[3] = 0; scsi_cmd.cmd[4] = mode; scsi_cmd.cmd[5] = 0; if (ioctl(fd,SCSI_IOCTL_SEND_COMMAND,(void *)&scsi_cmd)) error("motor control ioctl error"); } /* *---------------------------------------------------------------------- * * unlockdook -- * * send an unlock command to the scsi device * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void unlockdoor( int fd ) { scsi_cmd.inlen = 0; scsi_cmd.outlen = 0; scsi_cmd.cmd[0] = 0x1e; /* prevent/allow media removal */ scsi_cmd.cmd[1] = 0; scsi_cmd.cmd[2] = 0; scsi_cmd.cmd[3] = 0; scsi_cmd.cmd[4] = 0; scsi_cmd.cmd[5] = 0; if (ioctl(fd,SCSI_IOCTL_SEND_COMMAND,(void *)&scsi_cmd)) error("door unlock ioctl error"); } /* *---------------------------------------------------------------------- * * eject -- * * eject the disk * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void eject ( int fd ) { unlockdoor(fd); motor(fd,1); motor(fd,2); } /* *---------------------------------------------------------------------- * * get_prot_mode -- * * get the protection mode of the drive * * Results: * protection code - see dostatuus() * * Side effects: * None. * *---------------------------------------------------------------------- */ int get_prot_mode( int fd ) { scsi_cmd.inlen = 0; scsi_cmd.outlen = 256; scsi_cmd.cmd[0] = 6; /* Iomega non-sense command */ scsi_cmd.cmd[1] = 0; scsi_cmd.cmd[2] = 2; scsi_cmd.cmd[3] = 0; scsi_cmd.cmd[4] = 128; scsi_cmd.cmd[5] = 0; if (ioctl(fd,SCSI_IOCTL_SEND_COMMAND,(void *)&scsi_cmd)) error("non-sense ioctl error"); /* *see dostatus() for protection codes */ return (scsi_cmd.cmd[21] & 0x0f); } /* *---------------------------------------------------------------------- * * dostatus -- * * explain protection codes * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void dostatus( int fd, char * dev ) { int s; s = get_prot_mode(fd); if (s == 0) printf("jaztool: %s is not write-protected\n",dev); if (s == 2) printf("jaztool: %s is write-protected\n",dev); if (s == 3) printf("jaztool: %s is password write-protected\n",dev); } /* *---------------------------------------------------------------------- * * pmode -- * * change protection mode * * Results: * None. * * Side effects: * None. * *---------------------------------------------------------------------- */ void pmode ( int fd, int mode, char * dev) { int i, oldmode, len; char pw[34]; pw[0]=0; oldmode = get_prot_mode(fd); if ((1 & mode) || (1 & oldmode)) { printf("Password: "); fgets(pw,33,stdin); len = strlen(pw); if ((len > 0) && (pw[len-1] == '\n')) pw[len-1] = 0; } len = strlen(pw); scsi_cmd.inlen = len; scsi_cmd.outlen = 0; scsi_cmd.cmd[0] = 0x0c; scsi_cmd.cmd[1] = mode; scsi_cmd.cmd[2] = 0; scsi_cmd.cmd[3] = 0; scsi_cmd.cmd[4] = len; scsi_cmd.cmd[5] = 0; for(i=0;i<len;i++) { scsi_cmd.cmd[6+i] = pw[i]; } if (ioctl(fd,SCSI_IOCTL_SEND_COMMAND,(void *)&scsi_cmd)) error("set protection mode ioctl error"); dostatus(fd,dev); /* * whenever the protection is changes * the disk must be ejected * so linux can reset the wp mode */ eject(fd); } /* *---------------------------------------------------------------------- * * main -- * * the whole ball 'o' wax * * Results: * None. * * Side effects: * depends on the switches :-) * *---------------------------------------------------------------------- */ main(int argc, char **argv) { int rs; int jfd; if (argc != 3) { printf("usage: jaztool /dev/sd? eject|ro|rw|status\n"); exit(1); } if (!is_raw_scsi(argv[1])) error("not a raw scsi device"); rs = is_mounted(argv[1]); if (rs == -1) error("unable to access /etc/mtab"); if (rs == 1) error("device is mounted"); jfd = open(argv[1],0); if (jfd < 0) error("unable to open device"); if (!is_jaz(jfd)) error("device is not an IOMEGA JAZ drive"); if (!strcmp(argv[2],"eject")) eject(jfd); else if (!strcmp(argv[2],"ro")) pmode(jfd,2,argv[1]); else if (!strcmp(argv[2],"rw")) pmode(jfd,0,argv[1]); else if (!strcmp(argv[2],"PWRO")) pmode(jfd,3,argv[1]); else if (!strcmp(argv[2],"status")) dostatus(jfd,argv[1]); else error("unknown command"); close(jfd); }
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