Finally this works but wish to know any security implications if any.
www# usermod -G dialer www
www# chroot -u www /var/www /cgi-bin/modem
Status: 200 OK
Content-type: text/html
Connected to /dev/cuaU2 (speed 115200)
AT+CMGF=1
OK
[EOT]
www#
Thanks
Kihaguru.
On 2/8/19, Kihaguru Gathura <pqscr...@gmail.com> wrote:
>>
>> Is there a /var/www/dev/cuaU2
>
> Indeed this is present. created it before as follows:
>
> www# mkdir /var/www/dev
> www# cd /var/www/dev
> www# sh /dev/MAKEDEV ttyU2
> www# ls
> cuaU2 ttyU2
> www#
>
>>
>
> On 2/8/19, Edgar Pettijohn <ed...@pettijohn-web.com> wrote:
>>
>> 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?
>>> >
>>>
>>
>
