On Feb 8, 2019 9:01 AM, Kihaguru Gathura <pqscr...@gmail.com> wrote:
>
> Hi,
>
> What effective way can be used to apply permission to /dev/cuaU2 to
> avoid the error below.
>
>
> www# chroot -u www /var/www cgi-bin/modem
Is there a /var/www/dev/cuaU2
> Status: 200 OK
> Content-type: text/html
>
> cu: open("/dev/cuaU2"): Permission denied
>
> Note: chown www:daemon /dev/cuaU2 has not worked. chroot is in the
> root folder which allows devices.
>
> /dev/sd0a (87d0b25f285b037a.a) on /mnt type ffs (rw,
> asynchronous, local)
> /dev/sd0e (87d0b25f285b037a.e) on /mnt/home type ffs (rw,
> asynchronous, local, nodev, nosuid)
> /dev/sd0d (87d0b25f285b037a.d) on /mnt/usr type ffs (rw,
> asynchronous, local, nodev)
>
>
>
> # dmesg
> OpenBSD 6.4-current (GENERIC.MP) #253: Sun Nov 4 23:26:31 MST 2018
> dera...@arm64.openbsd.org:/usr/src/sys/arch/arm64/compile/GENERIC.MP
> real mem = 961421312 (916MB)
> avail mem = 902914048 (861MB)
> mainbus0 at root: Raspberry Pi 3 Model B Rev 1.2
> cpu0 at mainbus0 mpidr 0: ARM Cortex-A53 r0p4
> cpu0: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu0: 512KB 64b/line 16-way L2 cache
> efi0 at mainbus0: UEFI 2.7
> efi0: Das U-Boot rev 0x20180900
> simplefb0 at mainbus0: 656x416, 32bpp
> wsdisplay0 at simplefb0 mux 1
> wsdisplay0: screen 0-5 added (std, vt100 emulation)
> simplebus0 at mainbus0: "soc"
> bcmintc0 at simplebus0
> bcmdog0 at simplebus0
> bcmrng0 at simplebus0
> pluart0 at simplebus0
> bcmtemp0 at simplebus0
> bcmaux0 at simplebus0
> com0 at simplebus0: ns16550, no working fifo
> com0: console
> dwctwo0 at simplebus0
> simplebus1 at mainbus0: "clocks"
> agtimer0 at mainbus0: tick rate 19200 KHz
> cpu1 at mainbus0 mpidr 1: ARM Cortex-A53 r0p4
> cpu1: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu1: 512KB 64b/line 16-way L2 cache
> cpu2 at mainbus0 mpidr 2: ARM Cortex-A53 r0p4
> cpu2: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu2: 512KB 64b/line 16-way L2 cache
> cpu3 at mainbus0 mpidr 3: ARM Cortex-A53 r0p4
> cpu3: 32KB 64b/line 2-way L1 VIPT I-cache, 32KB 64b/line 4-way L1 D-cache
> cpu3: 512KB 64b/line 16-way L2 cache
> usb0 at dwctwo0: USB revision 2.0
> uhub0 at usb0 configuration 1 interface 0 "Broadcom DWC2 root hub" rev
> 2.00/1.00 addr 1
> uhub1 at uhub0 port 1 configuration 1 interface 0 "Standard
> Microsystems product 0x9514" rev 2.00/2.00 addr 2
> smsc0 at uhub1 port 1 configuration 1 interface 0 "Standard
> Microsystems SMSC9512/14" rev 2.00/2.00 addr 3
> smsc0: address b8:27:eb:fd:e2:73
> ukphy0 at smsc0 phy 1: Generic IEEE 802.3u media interface, rev. 3:
> OUI 0x0001f0, model 0x000c
> umass0 at uhub1 port 3 configuration 1 interface 0 "HP v222w" rev
> 2.00/11.00 addr 4
> umass0: using SCSI over Bulk-Only
> scsibus0 at umass0: 2 targets, initiator 0
> sd0 at scsibus0 targ 1 lun 0: <hp, v222w, 1100> SCSI2 0/direct
> removable serial.03f03f40AA0000000444
> sd0: 7680MB, 512 bytes/sector, 15728640 sectors
> vscsi0 at root
> scsibus1 at vscsi0: 256 targets
> softraid0 at root
> scsibus2 at softraid0: 256 targets
> bootfile: sd0a:/bsd
> boot device: sd0
> root on sd0a (87d0b25f285b037a.a) swap on sd0b dump on sd0b
> WARNING: CHECK AND RESET THE DATE!
> umsm0 at uhub1 port 5 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm1 at uhub1 port 5 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm0 detached
> umsm1 detached
> umsm0 at uhub1 port 5 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom0 at umsm0
> umsm1 at uhub1 port 5 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom1 at umsm1
> umsm2 at uhub1 port 5 configuration 1 interface 2 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom2 at umsm2
> umass1 at uhub1 port 5 configuration 1 interface 3 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass1: using SCSI over Bulk-Only
> scsibus3 at umass1: 2 targets, initiator 0
> cd0 at scsibus3 targ 1 lun 0: <HUAWEI, Mass Storage, 2.31> SCSI2
> 5/cdrom removable
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> uid 503 on /: file system full
> coredump of postgres(24493) failed, filesystem full
> uid 503 on /: file system full
> uid 503 on /: file system full
> ucom0 detached
> umsm0 detached
> ucom1 detached
> umsm1 detached
> ucom2 detached
> umsm2 detached
> cd0 detached
> scsibus3 detached
> umass1 detached
> sd1 detached
> scsibus4 detached
> umass2 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm0 detached
> umsm1 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom0 at umsm0
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom1 at umsm1
> umsm2 at uhub1 port 2 configuration 1 interface 2 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom2 at umsm2
> umass1 at uhub1 port 2 configuration 1 interface 3 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass1: using SCSI over Bulk-Only
> scsibus3 at umass1: 2 targets, initiator 0
> cd0 at scsibus3 targ 1 lun 0: <HUAWEI, Mass Storage, 2.31> SCSI2
> 5/cdrom removable
> umass2 at uhub1 port 2 configuration 1 interface 4 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass2: using SCSI over Bulk-Only
> scsibus4 at umass2: 2 targets, initiator 0
> sd1 at scsibus4 targ 1 lun 0: <HUAWEI, SD Storage, 2.31> SCSI2
> 0/direct removable
> ucom0 detached
> umsm0 detached
> ucom1 detached
> umsm1 detached
> ucom2 detached
> umsm2 detached
> cd0 detached
> scsibus3 detached
> umass1 detached
> sd1 detached
> scsibus4 detached
> umass2 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm0 detached
> umsm1 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom0 at umsm0
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom1 at umsm1
> umsm2 at uhub1 port 2 configuration 1 interface 2 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom2 at umsm2
> umass1 at uhub1 port 2 configuration 1 interface 3 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass1: using SCSI over Bulk-Only
> scsibus3 at umass1: 2 targets, initiator 0
> cd0 at scsibus3 targ 1 lun 0: <HUAWEI, Mass Storage, 2.31> SCSI2
> 5/cdrom removable
> umass2 at uhub1 port 2 configuration 1 interface 4 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5scsibus4 at umass2: 2 targets, initiator 0
> sd1 at scsibus4 targ 1 lun 0: <HUAWEI, SD Storage, 2.31> SCSI2
> 0/direct removable
> ucom0 detached
> umsm0 detached
> ucom1 detached
> umsm1 detached
> ucom2 detached
> umsm2 detached
> cd0 detached
> scsibus3 detached
> umass1 detached
> sd1 detached
> scsibus4 detached
> umass2 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umsm0 detached
> umsm1 detached
> umsm0 at uhub1 port 2 configuration 1 interface 0 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom0 at umsm0
> umsm1 at uhub1 port 2 configuration 1 interface 1 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom1 at umsm1
> umsm2 at uhub1 port 2 configuration 1 interface 2 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> ucom2 at umsm2
> umass1 at uhub1 port 2 configuration 1 interface 3 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass1: using SCSI over Bulk-Only
> scsibus3 at umass1: 2 targets, initiator 0
> cd0 at scsibus3 targ 1 lun 0: <HUAWEI, Mass Storage, 2.31> SCSI2
> 5/cdrom removable
> umass2 at uhub1 port 2 configuration 1 interface 4 "HUAWEI HUAWEI
> Mobile" rev 2.00/1.02 addr 5
> umass2: using SCSI over Bulk-Only
> scsibus4 at umass2: 2 targets, initiator 0
> sd1 at scsibus4 targ 1 lun 0: <HUAWEI, SD Storage, 2.31> SCSI2
> 0/direct removable
>
> Thanks,
>
> Kihaguru.
>
> On 9/11/18, Kihaguru Gathura <pqscr...@gmail.com> wrote:
> > Hi,
> >
> > I am able to send SMS using AT commands and C outside chroot using
> > code spinet below
> >
> > -------------------------------------------------------------------
> > #include <stdio.h>
> > #include <time.h>
> > #include <unistd.h>
> >
> > #define MODEM_PATH "cu -l /dev/cuaU0 -s 115200"
> >
> > int main()
> > {
> > FILE *out;
> > char s[40];
> >
> > printf("Content-type: text/html\n\n");
> >
> > snprintf(s, sizeof(s), "%s", MODEM_PATH);
> > ~
> > ~
> > ~
> > ~
> > ~
> > ~
> > return(0);
> > }
> > --------------------------------------------------------------------
> >
> > however, running the program from within chroot, I get the message
> >
> > /dev/cuaU0 - No such file or directory
> >
> > All files needed by cu are properly copied to chroot and cu works fine.
> >
> > Question:
> >
> > 1: How do i get /dev/cuaU0 device accessible under chroot?
> >
> > 2: Is there a better i.e more secure approach to access modem from
> > within chroot?
> >
>
