Archive for July 14th, 2007
investigate a process on Linux server using lsof
lsof – list open files is a very good tool for Linux Administrator
For example, you found a weird process
# ps aux USER PID %CPU %MEM VSZ RSS TTY STAT START TIME COMMAND root 14668 48.2 0.1 243504 7448 ? Sl Jul10 3319:53 ./bin/StoreGrid
Hmmm… what is that, then you could simply check it using lsof
# lsof -p 14668 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME StoreGrid 14668 root cwd DIR 253,0 32768 10977505 /home/storegrid/StoreGrid StoreGrid 14668 root rtd DIR 253,0 4096 2 / StoreGrid 14668 root txt REG 253,0 11812748 10977512 /home/storegrid/bin/StoreGrid StoreGrid 14668 root mem REG 253,0 21704 38502449 /lib/libnss_dns-2.3.6.so StoreGrid 14668 root mem REG 253,0 76272 38502417 /lib/libresolv-2.3.6.so StoreGrid 14668 root mem REG 253,0 126576 38502420 /lib/ld-2.3.6.so StoreGrid 14668 root mem REG 253,0 1481808 38502422 /lib/libc-2.3.6.so StoreGrid 14668 root mem REG 253,0 16244 38502435 /lib/libdl-2.3.6.so StoreGrid 14668 root mem REG 253,0 201032 38502439 /lib/libm-2.3.6.so StoreGrid 14668 root mem REG 253,0 101680 38502429 /lib/libpthread-2.3.6.so StoreGrid 14668 root mem REG 253,0 46640 38502452 /lib/libnss_files-2.3.6.so StoreGrid 14668 root mem REG 253,0 733520 37828423 /usr/lib/libstdc++.so.5.0.7 StoreGrid 14668 root mem REG 253,0 40112 38502443 /lib/libgcc_s-4.0.2-20051126.so.1 StoreGrid 14668 root 0r CHR 1,3 1938 /dev/null StoreGrid 14668 root 1w CHR 1,3 1938 /dev/null StoreGrid 14668 root 2w CHR 1,3 1938 /dev/null StoreGrid 14668 root 3u IPv4 34761557 TCP *:32005 (LISTEN) StoreGrid 14668 root 4u IPv4 34761558 UDP *:58304 StoreGrid 14668 root 5u IPv4 34761559 UDP *:17254 StoreGrid 14668 root 6u IPv4 34761560 UDP *:6363 StoreGrid 14668 root 7u IPv4 69369170 TCP xxxxxx:37402->yyyyy:32004 (ESTABLISHED) StoreGrid 14668 root 8u IPv4 34761564 UDP *:6364 StoreGrid 14668 root 12u IPv4 34761590 UDP *:32006
Got it, I found binary executables, socket information, and many other information on this process. Actually this lsof tool read and process information from “/proc” pseudo filesystem on Linux, for pid 14668, then this tool will investigate /proc/14668 directory content.
# ls -l /proc/14668 total 0 dr-xr-xr-x 5 root root 0 Jul 10 04:15 ./ dr-xr-xr-x 172 root root 0 Jul 5 04:36 ../ dr-xr-xr-x 2 root root 0 Jul 14 23:04 attr/ -r-------- 1 root root 0 Jul 14 23:04 auxv -r--r--r-- 1 root root 0 Jul 14 21:19 cmdline -r--r--r-- 1 root root 0 Jul 14 23:04 cpuset lrwxrwxrwx 1 root root 0 Jul 14 22:47 cwd -> /home/storegrid/StoreGrid/ -r-------- 1 root root 0 Jul 14 23:04 environ lrwxrwxrwx 1 root root 0 Jul 14 08:50 exe -> /home/storegrid/bin/StoreGrid* dr-x------ 2 root root 0 Jul 14 22:47 fd/ -rw-r--r-- 1 root root 0 Jul 14 23:04 loginuid -r-------- 1 root root 0 Jul 14 22:47 maps -rw------- 1 root root 0 Jul 14 23:04 mem -r--r--r-- 1 root root 0 Jul 14 23:04 mounts -r-------- 1 root root 0 Jul 14 23:04 mountstats -rw-r--r-- 1 root root 0 Jul 14 23:04 oom_adj -r--r--r-- 1 root root 0 Jul 14 23:04 oom_score lrwxrwxrwx 1 root root 0 Jul 14 22:47 root -> // -r--r--r-- 1 root root 0 Jul 14 23:04 schedstat -r-------- 1 root root 0 Jul 14 23:04 smaps -r--r--r-- 1 root root 0 Jul 14 21:19 stat -r--r--r-- 1 root root 0 Jul 14 08:50 statm -r--r--r-- 1 root root 0 Jul 14 21:19 status dr-xr-xr-x 23 root root 0 Jul 10 04:15 task/ -r--r--r-- 1 root root 0 Jul 14 23:04 wchan
lsof is also able to detect port UDP/TCP activity, for example from “netstat” you get weird information
#netstat -nl Active Internet connections (only servers) Proto Recv-Q Send-Q Local Address Foreign Address State tcp 0 0 0.0.0.0:1 0.0.0.0:* LISTEN
Hey, what server running on port TCP number 1???
Find it
# lsof -i TCP:1 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME portsentr 3646 root 0u IPv4 10777 TCP *:tcpmux (LISTEN) # lsof -p 3646 COMMAND PID USER FD TYPE DEVICE SIZE NODE NAME portsentr 3646 root cwd DIR 253,0 4096 2 / portsentr 3646 root rtd DIR 253,0 4096 2 / portsentr 3646 root txt REG 253,0 30128 37818458 /usr/sbin/portsentry portsentr 3646 root mem REG 253,0 126576 38502420 /lib/ld-2.3.6.so portsentr 3646 root mem REG 253,0 1481808 38502422 /lib/libc-2.3.6.so portsentr 3646 root 0u IPv4 10777 TCP *:tcpmux (LISTEN) portsentr 3646 root 1u IPv4 10779 TCP *:sunrpc (LISTEN)
Got it….. nice tool right?
Calendar
Hey, do you need a javascript for calendar?
GSM Mobile Application Part (MAP) – Part 1
What is MAP? From Wikipedia definition I found
The Mobile Application Part (MAP) is an SS7 protocol which provides an application layer for the various nodes in GSM and UMTS mobile core networks and GPRS core networks to communicate with each other in order to provide services to mobile phone users. The Mobile Application Part is the application-layer protocol used to access the Home Location Register, Visitor Location Register, Mobile Switching Center, Equipment Identity Register, Authentication Centre, Short message service center and Serving GPRS Support Node.
Last time I worked at a company that develop their own SMSC, HLR, VLR, and other telco product. One of my job is developing GSM-MAP Driver focusing on SMSC MAP stuff. OK, let’s talk about MAP 
What you need to know first is SS7. If you’re familiar with TCP/IP stack, it will not really hard to understand, but maybe yes hard to figure 
.
Just for additional information, let me give you a snapshot log what happened when SMSC want to deliver SMS to your mobile phone:
2006-12-11 13:40:48.789 491 MSU UDT 8842 403 Begin 00010021 MAP OP: ForwardShortMessage
MTP2 MSU
[.111 1011] BSN 123
[1... ....] BIB 1
[.111 1110] FSN 126
[1... ....] FIB 1
[..11 1111] Li 63
MTP3
[10.. ....] NI - Network Indicator National network (2)
[..00 ....] Spare 0
[.... 0011] SI - Service Indicator SCCP (3)
DPC 8842 (Dec) - 228a (Hex) - Osaka
OPC 0403 (Dec) - 0193 (Hex)
SLS 05 (Dec) - 05 (Hex)
SCCP Msg=UDT unitdata
[0000 1001] Message Type UDT unitdata
Protocol class 80 (Hex)
[1000 ....] Message handling Return message on error
[.... 0000] Protocol Class Class 0
Called party address
Length 10
[.0.. ....] Routing indicator Routing based on Global Title
[..01 00..] Global Title included includes translation type, numbering plan, encoding scheme and nature of address indicator
[.... ..1.] Subsystem number In use
[.... ...0] Signalling point code indicator Not in use
[0000 1000] Affected Subsystem MSC
[0000 0000] Translation type Not used
[0001 ....] Numbering plan ISDN/telephony numbering plan (Rec E.163/E.164)
[.... 0010] Encoding scheme BCD even number digits
[.000 0100] Nature of address indicator International number
Called address 4540590016
Calling party address
Length 10
[.0.. ....] Routing indicator Routing based on Global Title
[..01 00..] Global Title included includes translation type, numbering plan, encoding scheme and nature of address indicator
[.... ..1.] Subsystem number In use
[.... ...0] Signalling point code indicator Not in use
[0000 1000] Affected Subsystem MSC
[0000 0000] Translation type Not used
[0001 ....] Numbering plan ISDN/telephony numbering plan (Rec E.163/E.164)
[.... 0010] Encoding scheme BCD even number digits
[.000 0100] Nature of address indicator International number
Calling address 4531899997
Data
Length 90
TCAP
Message Type Begin (2)
Transaction Portion
OrigID '00 01 00 21' Hex
DialoguePortion
External
OBJECT IDENTIFIER 0.0.17.773.1.1.1
itu-t(0) rec(0) q(17) (773) as(1) dialogue pdu(1) Version1(1)
Single ASN.1
DialogueRequest
OBJECT IDENTIFIER 0.4.0.0.1.0.25.2
itu-t(0) id-org(4) etsi(0) mobileDomain(0) gsm-network(1) appContext(0)
shortMsgMT-RelayContext(25).version2(2)
Components Portion
Component MAP (Component 1)
Component type Invoke
Invoke-ID 1
MAP (Component 1)
[0010 1110] Operation ForwardShortMessage (46 Dec)
SM-RP-DA
[1000 0000] IMSI MCC:238 MNC:07 MSIN:0000000007
SM-RP-(D)OA
[1000 0100] serviceCentreAddress
AddressString
[1... ....] Extension no extension
[.001 ....] Nature of address indicator International number
[.... 0001] numbering plan indicator ISDN/Telephony Num plan.E.164
Address digits 4531899997
SM-RP-UI
[0000 0100] SignalInfo '240a91541308007000006021112104540004d4f29c0e'Hex
SMS
[0000 0100] SMS_V2_GSM03.04
[.... ..00] TP-MTI SMS-DELIVER (SC to MS)
[.... .1..] TP-MMS No more messages are waiting for the MS in this SC
[...0 0...] spare
[..1. ....] TP-SRI A status report will be returned to the SME
[.0.. ....] TP-UDHI The TP-UD field contains only the short message
[0... ....] TP-RP TP-Reply-Path parameter is not set in this SMS-SUBMIT/DELIVER
TP-OA Originating-Address
[.001 ....] Type of number International number
[.... 0001] Numbering plan id ISDN/Telephony (E.164/E.163)
Number 4531800007
TP-PID Protocol-Identifier
[00.. ....] Assigns bits 0..5 telematic
[..0. ....] no interworking, but SME-to-SME protocol
[...0 0000] SM-AL protocol Unknown
TP-DCS Data-Coding-Scheme
[00.. ....] Coding group General Data Coding Indication
[..0. ....] uncompressed
[...0 ....] Bit 1 & 0 have no message class meaning
[.... 00..] Alphabet Default alphabet-7bit
TP-SCTS Service-Center-Time-Stamp
year 06
month 12
day 11
hour 12
minute 40
second 45
time-zone GMT +00 (0 quarters)
TP-UDL User-Data-Length 4
TP-UD User-Data
TP-User-Data Test
FB FE 3F 83 8A E2 64 50 09 80 03 0D 17 0A 12 08 00 12 04 54
04 95 00 61 0A 12 08 00 12 04 54 13 98 99 79 5A 62 58 48 04
00 01 00 21 6B 1A 28 18 06 07 00 11 86 05 01 01 01 A0 0D 60
0B A1 09 06 07 04 00 00 01 00 19 02 6C 34 A1 32 02 01 01 02
01 2E 30 2A 80 08 32 08 07 00 00 00 00 F7 84 06 91 54 13 98
99 79 04 16 24 0A 91 54 13 08 00 70 00 00 60 21 11 21 04 54
00 04 D4 F2 9C 0E
See u…
Length of Array in C
Q: How to count length of array in C/C++?
A:
———- cut here ———-
typedef struct {
int x;
int y;
}ok ;
int main(){
ok i [] = {
{1,2},
{3,4}
};
printf(“SIZE: %d\n”,sizeof (i) / sizeof (*i));
return 0;
}
==> Size = sizeof(i)/sizeof(*i)
Scripting Language for Mobile Phone
Programming on Symbian is difficult compared to many other programming fields. Using C++ as main programming language with many boundaries, different memory management, and many other rules, it’s not easy for you even just to create your first HelloWorld application. Thanks, today there’re many choices for creating Symbian application which is more simpler. Python for S60 is one of them. Actually, I knew it since first release for S60 1st Edition, already tried it and so far so good.
Using this scripting language, you can access many features from Symbian OS itself, like get IMEI information, access Symbian DBMS, SMS Inbox, and many other which commonly is not accessible through J2ME.
Just make a try…
