Have removed the group assginment and instead did chown as follows:
www# chown www:daemon /var/www/dev/cuaU2
www# chroot -u www /var/www /gathura/modem
Status: 200 OK
Content-type: text/html
Connected to /dev/cuaU2 (speed 115200)
AT+CMGF=1
OK
[EOT]
www#
Thanks Edgar
Kihaguru.
On 2/8/19, Edgar Pettijohn <ed...@pettijohn-web.com> wrote:
>
> On Feb 8, 2019 2:21 PM, 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.
>
> What about chown www:daemon /var/www/dev/cuaU0
This is a better option than assigning www to group dialer.
>
>> >>
>> >> /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)
>> >>
>
> Where is /var/www mounted?
Mounted on /dev/sd0a
>
>> >>
>> >>
>> >> # 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?
>> >> >
>> >>
>> >
>>
>
