About WiMAX Proposal

About WiMAX Proposal

Milestones

• Aug.27-Sep.3:Internal testing inside NCNU campus
• Sep.5-Sep.15:Install,configure, and test application system in ITRI
• Oct.1:Showcase the application to ITRI
• Oct.22:Demonstrate the application at the Taiwan WiMAX Forum F2F Meeting

Demo key point:

• Lecture Streaming
• English Listening
• Real-time Collaboration

Script(by beautidays)

It is 8:00 in the morning.John who is an expert of GDB is sitting on the bench in the park.He eats breakfast and practices his english listening ability.He connects to the NCNU English Classroom, the English listening website provided by NCNU.

NCNU English Classroom, http://english.csie.ncnu.edu.tw, is provided to improve English ability of NCNU students.The main function is the listening part with VOA news and ICRT for English listening practicing. It provides synchronous subtitles and interactive audio-On-Demand function. Through WiMAX, we can extend this service anywhere.

Mary studies in National Chi-Nan University. She goes to school by shuttle bus every weekday.She spends 30 minutes to take the bus one day, 15 to go to school, 15 to go downtown. She also spends extra at most 30 minutes to wait for the bus each weekday, because there are two runs in an hour. Therefore, she wastes at most one hour to idle or do nothing but chatting on the bus. However, she has more options now due to WiMAX. Her first class is GDB(這裡是否要用同位語說明一下GDB是什麼,eg, an open source debug tool), and she is doing preparation for lessons before class. She reviews the presentation about the introduction of GDB uploaded at the server, http://XMS.voip.edu.tw/xms/. This website supports Powercam that can record and share the presentations including the slide show, voice of speakers, the cursor on the screen, and the strokes marked by the mouse. Through WiMAX, we can use this service everywhere. When Mary is doing the review, she is a little bit confused.
She makes a phone call to the Help Desk Personnel to ask help solve her problem.(文法怪~)

Operator:NCNU Call Center. May I help you?
Mary:Hello, I have a question about GDB. I compile a source code with the command "gcc -g" and the file name following. The execution file, a.out, will be produced. How could I change the execution file name?
Operator:hmm...,Sorry, I can't solve the question for you. Please wait for a while. I will transfer your call to our expert of GDB.

The assistant searches an expert who is good at GDB and transfers the call to him. Although the expert isn't seated in the office or library, he also can get the call.

John:This is John. May I help you?
Mary:Hello, This is Mary. I have a question about GDB.

Mary repeats the question to the expert.

John:OK, It's easy. You just have to add the option -o and the file name as you want. For example, if the source code is "test.c" and the new name is test, the command is "gcc -g test.c -o test". After that, the execution file, test, will be created.
Mary:I see. Thank you very much.
John:You're welcome.

It is a good extension of WiMAX because we can learn anywhere and anytime.We don't have to waste time due to the limitation of space.

------

行前準備事宜：

必備物品：

兩台筆電

完整的台詞講稿

rundown

相機

Libpcap note

在Unix/Linux從kernel獲得封包的工具。獨立API接口，為底層網路監控提供一個可移植的框架，可用於網路統計收集、安全監控、網路調試…等工作。
cf.Winpcap:同libpcap，支援Win32平台

• NPF(Netgroup Packet Filter)
• packet.dll
• wpcap.dll

基本function

pcap_lookupdev(); //設定網路設備,回傳一個可使用的device,refer to "lookupdev.c";char *pcpa_lookupdev(char *errbuf)

pcap_lookupnet(); //設定網域;const char *device,bpf_u_int32 *netp,bpf_u_int32 *maskp,char *errbuf)

//找network number and mask

開始一個session:

pcpa_open_live(); //開始網路介面卡以準備進行封包交換

擷取packet:

pcap_next(); //refer to "pcap_next.c" and "timestamp.c"

只抓想要的packet(filter)

pcap_compile(); //編譯正規過濾語

pcap_setfilter(); //設定過濾器

Application built on libpcap

• ntop(network top)
• snort( 區分正常及惡意的封包)
• wireshark

Install libpcap

./config

make

sudo make install

Reference:

http://en.wikipedia.org/wiki/Libpcap

http://www.tcpdump.org/pcap.htm

RFC3261 notes

SIP(Session Initiation Protocol)

Structure of SIP:

• syntax and encoding
• transport layer
• transaction layer(note:stateful proxy及UA才有transaction layer)

8.General User Agent Behavior
UAC and UAS procedurres depend on:

1. inside or outside of a dialog
2. method of request

Header of MUST contain:To,From,CSeq,Call-ID,Max-Forwards,Via
Request URI:
To: ex: To: Carol
From
tag

the types of response

• 1xx:Provisional
• 2xx:Successful
• 3xx:Redirectional
• 4xx:Client Failure
• 5xx:Server Failure
• 6xx:Global Failure
• to be continued...

以下是充場面用的目錄：(自己用來複習、理思路)

1 Introduction ........................................ 8
2 Overview of SIP Functionality ....................... 9
3 Terminology ......................................... 10
4 Overview of Operation ............................... 10
5 Structure of the Protocol ........................... 18
6 Definitions ......................................... 20
7 SIP Messages ........................................ 26
7.1 Requests ............................................ 27
7.2 Responses ........................................... 28
7.3 Header Fields ....................................... 29
7.3.1 Header Field Format ................................. 30
7.3.2 Header Field Classification ......................... 32
7.3.3 Compact Form ........................................ 32
7.4 Bodies .............................................. 33
7.4.1 Message Body Type ................................... 33
7.4.2 Message Body Length ................................. 33
7.5 Framing SIP Messages ................................ 34
8 General User Agent Behavior ......................... 34
8.1 UAC Behavior ........................................ 35
8.1.1 Generating the Request .............................. 35
8.1.1.1 Request-URI ......................................... 35
8.1.1.2 To .................................................. 36
8.1.1.3 From ................................................ 37
8.1.1.4 Call-ID ............................................. 37
8.1.1.5 CSeq ................................................ 38
8.1.1.6 Max-Forwards ........................................ 38
8.1.1.7 Via ................................................. 39
8.1.1.8 Contact ............................................. 40
8.1.1.9 Supported and Require ............................... 40
8.1.1.10 Additional Message Components ....................... 41
8.1.2 Sending the Request ................................. 41
8.1.3 Processing Responses ................................ 42
8.1.3.1 Transaction Layer Errors ............................ 42
8.1.3.2 Unrecognized Responses .............................. 42
8.1.3.3 Vias ................................................ 43
8.1.3.4 Processing 3xx Responses ............................ 43
8.1.3.5 Processing 4xx Responses ............................ 45
8.2 UAS Behavior ........................................ 46
8.2.1 Method Inspection ................................... 46
8.2.2 Header Inspection ................................... 46
8.2.2.1 To and Request-URI .................................. 46
8.2.2.2 Merged Requests ..................................... 47
8.2.2.3 Require ............................................. 47
8.2.3 Content Processing .................................. 48
8.2.4 Applying Extensions ................................. 49
8.2.5 Processing the Request .............................. 49


8.2.6 Generating the Response ............................. 49
8.2.6.1 Sending a Provisional Response ...................... 49
8.2.6.2 Headers and Tags .................................... 50
8.2.7 Stateless UAS Behavior .............................. 50
8.3 Redirect Servers .................................... 51
9 Canceling a Request ................................. 53
9.1 Client Behavior ..................................... 53
9.2 Server Behavior ..................................... 55
10 Registrations ....................................... 56
10.1 Overview ............................................ 56
10.2 Constructing the REGISTER Request ................... 57
10.2.1 Adding Bindings ..................................... 59
10.2.1.1 Setting the Expiration Interval of Contact Addresses 60
10.2.1.2 Preferences among Contact Addresses ................. 61
10.2.2 Removing Bindings ................................... 61
10.2.3 Fetching Bindings ................................... 61
10.2.4 Refreshing Bindings ................................. 61
10.2.5 Setting the Internal Clock .......................... 62
10.2.6 Discovering a Registrar ............................. 62
10.2.7 Transmitting a Request .............................. 62
10.2.8 Error Responses ..................................... 63
10.3 Processing REGISTER Requests ........................ 63
11 Querying for Capabilities ........................... 66
11.1 Construction of OPTIONS Request ..................... 67
11.2 Processing of OPTIONS Request ....................... 68
12 Dialogs ............................................. 69
12.1 Creation of a Dialog ................................ 70
12.1.1 UAS behavior ........................................ 70
12.1.2 UAC Behavior ........................................ 71
12.2 Requests within a Dialog ............................ 72
12.2.1 UAC Behavior ........................................ 73
12.2.1.1 Generating the Request .............................. 73
12.2.1.2 Processing the Responses ............................ 75
12.2.2 UAS Behavior ........................................ 76
12.3 Termination of a Dialog ............................. 77
13 Initiating a Session ................................ 77
13.1 Overview ............................................ 77
13.2 UAC Processing ...................................... 78
13.2.1 Creating the Initial INVITE ......................... 78
13.2.2 Processing INVITE Responses ......................... 81
13.2.2.1 1xx Responses ....................................... 81
13.2.2.2 3xx Responses ....................................... 81
13.2.2.3 4xx, 5xx and 6xx Responses .......................... 81
13.2.2.4 2xx Responses ....................................... 82
13.3 UAS Processing ...................................... 83
13.3.1 Processing of the INVITE ............................ 83
13.3.1.1 Progress ............................................ 84
13.3.1.2 The INVITE is Redirected ............................ 84

13.3.1.3 The INVITE is Rejected .............................. 85
13.3.1.4 The INVITE is Accepted .............................. 85
14 Modifying an Existing Session ....................... 86
14.1 UAC Behavior ........................................ 86
14.2 UAS Behavior ........................................ 88
15 Terminating a Session ............................... 89
15.1 Terminating a Session with a BYE Request ............ 90
15.1.1 UAC Behavior ........................................ 90
15.1.2 UAS Behavior ........................................ 91
16 Proxy Behavior ...................................... 91
16.1 Overview ............................................ 91
16.2 Stateful Proxy ...................................... 92
16.3 Request Validation .................................. 94
16.4 Route Information Preprocessing ..................... 96
16.5 Determining Request Targets ......................... 97
16.6 Request Forwarding .................................. 99
16.7 Response Processing ................................. 107
16.8 Processing Timer C .................................. 114
16.9 Handling Transport Errors ........................... 115
16.10 CANCEL Processing ................................... 115
16.11 Stateless Proxy ..................................... 116
16.12 Summary of Proxy Route Processing ................... 118
16.12.1 Examples ............................................ 118
16.12.1.1 Basic SIP Trapezoid ................................. 118
16.12.1.2 Traversing a Strict-Routing Proxy ................... 120
16.12.1.3 Rewriting Record-Route Header Field Values .......... 121
17 Transactions ........................................ 122
17.1 Client Transaction .................................. 124
17.1.1 INVITE Client Transaction ........................... 125
17.1.1.1 Overview of INVITE Transaction ...................... 125
17.1.1.2 Formal Description .................................. 125
17.1.1.3 Construction of the ACK Request ..................... 129
17.1.2 Non-INVITE Client Transaction ....................... 130
17.1.2.1 Overview of the non-INVITE Transaction .............. 130
17.1.2.2 Formal Description .................................. 131
17.1.3 Matching Responses to Client Transactions ........... 132
17.1.4 Handling Transport Errors ........................... 133
17.2 Server Transaction .................................. 134
17.2.1 INVITE Server Transaction ........................... 134
17.2.2 Non-INVITE Server Transaction ....................... 137
17.2.3 Matching Requests to Server Transactions ............ 138
17.2.4 Handling Transport Errors ........................... 141
18 Transport ........................................... 141
18.1 Clients ............................................. 142
18.1.1 Sending Requests .................................... 142
18.1.2 Receiving Responses ................................. 144
18.2 Servers ............................................. 145
18.2.1 Receiving Requests .................................. 145

18.2.2 Sending Responses ................................... 146
18.3 Framing ............................................. 147
18.4 Error Handling ...................................... 147
19 Common Message Components ........................... 147
19.1 SIP and SIPS Uniform Resource Indicators ............ 148
19.1.1 SIP and SIPS URI Components ......................... 148
19.1.2 Character Escaping Requirements ..................... 152
19.1.3 Example SIP and SIPS URIs ........................... 153
19.1.4 URI Comparison ...................................... 153
19.1.5 Forming Requests from a URI ......................... 156
19.1.6 Relating SIP URIs and tel URLs ...................... 157
19.2 Option Tags ......................................... 158
19.3 Tags ................................................ 159
20 Header Fields ....................................... 159
20.1 Accept .............................................. 161
20.2 Accept-Encoding ..................................... 163
20.3 Accept-Language ..................................... 164
20.4 Alert-Info .......................................... 164
20.5 Allow ............................................... 165
20.6 Authentication-Info ................................. 165
20.7 Authorization ....................................... 165
20.8 Call-ID ............................................. 166
20.9 Call-Info ........................................... 166
20.10 Contact ............................................. 167
20.11 Content-Disposition ................................. 168
20.12 Content-Encoding .................................... 169
20.13 Content-Language .................................... 169
20.14 Content-Length ...................................... 169
20.15 Content-Type ........................................ 170
20.16 CSeq ................................................ 170
20.17 Date ................................................ 170
20.18 Error-Info .......................................... 171
20.19 Expires ............................................. 171
20.20 From ................................................ 172
20.21 In-Reply-To ......................................... 172
20.22 Max-Forwards ........................................ 173
20.23 Min-Expires ......................................... 173
20.24 MIME-Version ........................................ 173
20.25 Organization ........................................ 174
20.26 Priority ............................................ 174
20.27 Proxy-Authenticate .................................. 174
20.28 Proxy-Authorization ................................. 175
20.29 Proxy-Require ....................................... 175
20.30 Record-Route ........................................ 175
20.31 Reply-To ............................................ 176
20.32 Require ............................................. 176
20.33 Retry-After ......................................... 176
20.34 Route ............................................... 177


20.35 Server .............................................. 177
20.36 Subject ............................................. 177
20.37 Supported ........................................... 178
20.38 Timestamp ........................................... 178
20.39 To .................................................. 178
20.40 Unsupported ......................................... 179
20.41 User-Agent .......................................... 179
20.42 Via ................................................. 179
20.43 Warning ............................................. 180
20.44 WWW-Authenticate .................................... 182
21 Response Codes ...................................... 182
21.1 Provisional 1xx ..................................... 182
21.1.1 100 Trying .......................................... 183
21.1.2 180 Ringing ......................................... 183
21.1.3 181 Call Is Being Forwarded ......................... 183
21.1.4 182 Queued .......................................... 183
21.1.5 183 Session Progress ................................ 183
21.2 Successful 2xx ...................................... 183
21.2.1 200 OK .............................................. 183
21.3 Redirection 3xx ..................................... 184
21.3.1 300 Multiple Choices ................................ 184
21.3.2 301 Moved Permanently ............................... 184
21.3.3 302 Moved Temporarily ............................... 184
21.3.4 305 Use Proxy ....................................... 185
21.3.5 380 Alternative Service ............................. 185
21.4 Request Failure 4xx ................................. 185
21.4.1 400 Bad Request ..................................... 185
21.4.2 401 Unauthorized .................................... 185
21.4.3 402 Payment Required ................................ 186
21.4.4 403 Forbidden ....................................... 186
21.4.5 404 Not Found ....................................... 186
21.4.6 405 Method Not Allowed .............................. 186
21.4.7 406 Not Acceptable .................................. 186
21.4.8 407 Proxy Authentication Required ................... 186
21.4.9 408 Request Timeout ................................. 186
21.4.10 410 Gone ............................................ 187
21.4.11 413 Request Entity Too Large ........................ 187
21.4.12 414 Request-URI Too Long ............................ 187
21.4.13 415 Unsupported Media Type .......................... 187
21.4.14 416 Unsupported URI Scheme .......................... 187
21.4.15 420 Bad Extension ................................... 187
21.4.16 421 Extension Required .............................. 188
21.4.17 423 Interval Too Brief .............................. 188
21.4.18 480 Temporarily Unavailable ......................... 188
21.4.19 481 Call/Transaction Does Not Exist ................. 188
21.4.20 482 Loop Detected ................................... 188
21.4.21 483 Too Many Hops ................................... 189
21.4.22 484 Address Incomplete .............................. 189

21.4.23 485 Ambiguous ....................................... 189
21.4.24 486 Busy Here ....................................... 189
21.4.25 487 Request Terminated .............................. 190
21.4.26 488 Not Acceptable Here ............................. 190
21.4.27 491 Request Pending ................................. 190
21.4.28 493 Undecipherable .................................. 190
21.5 Server Failure 5xx .................................. 190
21.5.1 500 Server Internal Error ........................... 190
21.5.2 501 Not Implemented ................................. 191
21.5.3 502 Bad Gateway ..................................... 191
21.5.4 503 Service Unavailable ............................. 191
21.5.5 504 Server Time-out ................................. 191
21.5.6 505 Version Not Supported ........................... 192
21.5.7 513 Message Too Large ............................... 192
21.6 Global Failures 6xx ................................. 192
21.6.1 600 Busy Everywhere ................................. 192
21.6.2 603 Decline ......................................... 192
21.6.3 604 Does Not Exist Anywhere ......................... 192
21.6.4 606 Not Acceptable .................................. 192
22 Usage of HTTP Authentication ........................ 193
22.1 Framework ........................................... 193
22.2 User-to-User Authentication ......................... 195
22.3 Proxy-to-User Authentication ........................ 197
22.4 The Digest Authentication Scheme .................... 199
23 S/MIME .............................................. 201
23.1 S/MIME Certificates ................................. 201
23.2 S/MIME Key Exchange ................................. 202
23.3 Securing MIME bodies ................................ 205
23.4 SIP Header Privacy and Integrity using S/MIME:
Tunneling SIP ....................................... 207
23.4.1 Integrity and Confidentiality Properties of SIP
Headers ............................................. 207
23.4.1.1 Integrity ........................................... 207
23.4.1.2 Confidentiality ..................................... 208
23.4.2 Tunneling Integrity and Authentication .............. 209
23.4.3 Tunneling Encryption ................................ 211
24 Examples ............................................ 213
24.1 Registration ........................................ 213
24.2 Session Setup ....................................... 214
25 Augmented BNF for the SIP Protocol .................. 219
25.1 Basic Rules ......................................... 219
26 Security Considerations: Threat Model and Security
Usage Recommendations ............................... 232
26.1 Attacks and Threat Models ........................... 233
26.1.1 Registration Hijacking .............................. 233
26.1.2 Impersonating a Server .............................. 234
26.1.3 Tampering with Message Bodies ....................... 235
26.1.4 Tearing Down Sessions ............................... 23

26.1.5 Denial of Service and Amplification ................. 236
26.2 Security Mechanisms ................................. 237
26.2.1 Transport and Network Layer Security ................ 238
26.2.2 SIPS URI Scheme ..................................... 239
26.2.3 HTTP Authentication ................................. 240
26.2.4 S/MIME .............................................. 240
26.3 Implementing Security Mechanisms .................... 241
26.3.1 Requirements for Implementers of SIP ................ 241
26.3.2 Security Solutions .................................. 242
26.3.2.1 Registration ........................................ 242
26.3.2.2 Interdomain Requests ................................ 243
26.3.2.3 Peer-to-Peer Requests ............................... 245
26.3.2.4 DoS Protection ...................................... 246
26.4 Limitations ......................................... 247
26.4.1 HTTP Digest ......................................... 247
26.4.2 S/MIME .............................................. 248
26.4.3 TLS ................................................. 249
26.4.4 SIPS URIs ........................................... 249
26.5 Privacy ............................................. 251
27 IANA Considerations ................................. 252
27.1 Option Tags ......................................... 252
27.2 Warn-Codes .......................................... 252
27.3 Header Field Names .................................. 253
27.4 Method and Response Codes ........................... 253
27.5 The "message/sip" MIME type. ....................... 254
27.6 New Content-Disposition Parameter Registrations ..... 255
28 Changes From RFC 2543 ............................... 255
28.1 Major Functional Changes ............................ 255
28.2 Minor Functional Changes ............................ 260

研究需用的PHP function整理

mail($to,$subject,$message)

//mail function
mail("收件人","信件主題", 信件內容[, 標頭]);
?>

eg.


mail("jacch@pchome.com.tw","hi!您好","這封信件是用mail()函式發送的信件!");
?>

Linux 下安裝無線網卡

• $ lopci grep controller
• 找wireless or network的keywords
• eg.在ASUS M2N找到Intel corporation PRO/Wireless LAN 21003B Mini PCI Adapter
• 要裝上kernel module和firmware

Ad-Hoc and SIP

(我承認我看不太懂這篇，就連什麼是Ad-Hoc都搞不清楚
)
ubiquitous communication
decentralized
Mobile Ad-Hoc Networks(MANET)

SIP location service
SIP Cache
/a framework:doesn't support centralized servers;dSIP(decentralized SIP)
\a algorithm:PCache

• embed a subset of SIP server proxy and registar server function in each end node.

SIP PCache
Message Type REGISTER Dissemination
MESSAGE Query
200OK Query reply

Header name Max-Forwards TTL
Form Source
Call-ID Serial Number
CSeq Time from Storage
Via Route Stack
Content-Length #items
Body Items

ISO精神

1.Write down SOP(Standard Operation Procedure).
2.Follow what you have written down.