IP L09( Tue) : Time-stamp: Tue 14:52 JST hig TCP/IP. IP,,,. ( ) L09 IP (2017) 1 / 28
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1 L09( Tue) : Time-stamp: Tue 14:52 JST hig TCP/IP. IP,,,. L09 (2017) 1 / 28
2 9, IP, - L09 (2017) 2 / 28
3 C (ex. ) 1 TCP/IP 2 3 ( ) ( L09 (2017) 3 / 28
4 50+5, ( )50+5. ( ) I trial, ,, trial,, : 35 : e.,, or ( ), 5 (. ).., ( ). L09 (2017) 4 / 28
5 : : = (3 ): :.,, C. L09 (2017) 5 / 28
6 : hig : (1-502), 4(1-502) Web : ( QR ),. L09 (2017) 6 / 28
7 hig3.net Learn Math Moodle (LMS) Learn Math Moodle ( ) Ryukoku Applied Math Mahara (e ) RaMMahara, 10,, (2017). Web 9,, (2017)., Linux 15,, L09 (2017) 7 / 28
8 ? A ABC, B( 1 A) ABC. C?,. a.out ABC, b.out ABC. L09 (2017) 8 / 28
9 , IP, 9, IP, - L09 (2017) 9 / 28
10 , IP, OSI TCP/UDP IP, WiFi TCP/IP=Transport Control Protocol / Internet Protocol? :?? L09 (2017) 10 / 28
11 , IP,, IP,, ( )? IP IP address (IPv4) IP 1 1 ( ), 8 ( ) , IP. L09 (2017) 11 / 28
12 , IP, IANA.. IP IP :, ( ). IP : ( ) DHCP: IP IP address (IPv6) , 16, 2001:DB8:0:0:8:800:200C:417A ( ) 2001:DB8::8:800:200C:417A. IP? IPv4, IPv6 10 n? L09 (2017) 12 / 28
13 , IP, hostname FQDN=Fully Qualified Domain Name IP 1 1. : sirius.ws.ryukoku.ac.jp sirius ( ) ws.ryukoku.ac.jp ( ), sirius.ws.ryukoku.ac.jp FQDN., (IP ).,,. ICANN, JPNIC,. L09 (2017) 13 / 28
14 , IP,, IP,, localhost.. ( ) example.com, example.co.jp,... ( ) IP Linux / 1 % i f c o n f i g / I P 2 % h o s t www. ryukoku. ac. j p / > I P / 3 % h o s t / < I P / L09 (2017) 14 / 28
15 , IP, port well-known port numbers (= ). IANA. ( ) IANA ( ). 1., 2.,,... : FQDN IP, cache.st.ryukoku.ac.jp:8080 L09 (2017) 15 / 28
16 9, IP, - L09 (2017) 16 / 28
17 : Web -Web L09 (2017) 17 / server ( ). client.. TCP/IP /.. ( ) (hostname:port) (service) (request, ). (response, ).. ( )
18 - 9, IP, - L09 (2017) 18 / 28
19 -?, Web OK., Web. 1: daytime 1 #i n c l u d e <s t d i o. h> 2 #i n c l u d e <s t r i n g. h> / memset / 3 #i n c l u d e <s y s / s o c k e t. h> / s o c k e t, c o n n e ct / 4 #i n c l u d e <arpa / i n e t. h> / htons / 5 #i n c l u d e <n e t i n e t / i n. h> / htons, i n e t a d d r / 6 #i n c l u d e <u n i s t d. h> / c l o s e s i z e o f / 7 8 #d e f i n e SERVER ADDR #d e f i n e SERVER PORT #d e f i n e BUFFERSIZE i n t main ( ) { i n t s ; L09 (2017) 19 / 28
20 - 15 s t r u c t s o c k a d d r i n sa ; 16 i n t count ; 17 char buf [ BUFFERSIZE ] ; / / 20 s = s o c k e t ( AF INET, SOCK STREAM, 0 ) ; / : / 23 memset(&sa, 0, s i z e o f ( sa ) ) ; 24 sa. s i n f a m i l y=af INET ; 25 sa. s i n p o r t=htons (SERVER PORT ) ; 26 sa. s i n a d d r. s a d d r=i n e t a d d r (SERVER ADDR ) ; / = open / 29 connect ( s, ( s t r u c t s o c k a d d r )& sa, s i z e o f ( sa ) ) ; / s c a n f / 32 count=r e c v ( s, buf, BUFFERSIZE 1, 0 ) ; / / 35 buf [ count ]= \0 ; L09 (2017) 20 / 28
21 - 36 p r i n t f ( %s, buf ) ; / c l o s e / 39 shutdown ( s, SHUT RDWR ) ; 40 c l o s e ( s ) ; r e t u r n 0 ; } sizeof int x;, sizeof (int), sizeof x ( ) sizeof(char)==1 L09 (2017) 21 / 28
22 - /etc/services IETF RFC=Request for Comment (IETF ).,,. L09 (2017) 22 / 28
23 -? ( ) fopen socket fopen connect / fscanf,fprintf recv,send fclose shutdown fclose close fopen-fscanf-fclose, open-read-close. L09 (2017) 23 / 28
24 - 1 #i n c l u d e <s y s / t y p e s. h> 2 #i n c l u d e <s y s / s o c k e t. h> 3 4 i n t s o c k e t ( i n t f a m i l y, i n t type, i n t p r o t o c o l ) ; 5 /, / 6 7 i n t connect ( i n t sockfd, s t r u c t s o c k a d d r a d d r e s s, i n t a d d r l e n 8 / s o c k f d, 9 a d d r e s s 10 / i n t r e c v ( i n t sockfd, char buf, i n t len, i n t f l a g s ) ; 13 / b u f, l e n / 14 /. 0, 1 / i n t send ( i n t sockfd, char buf, i n t len, i n t f l a g s ) ; 17 / b u f, l e n / 18 /. 1 / L09 (2017) 24 / 28
25 - 1 #i n c l u d e <s y s / s o c k e t. h> 2 i n t shutdown ( i n t sockfd, i n t how ) ; 1 #i n c l u d e <u n i s t d. h> 2 i n t c l o s e ( i n t s o c k e t f d ) ;.,., ( ) man. 1 % man s o c k e t 2 % man k s o c k e t 3 % man 2 s o c k e t 2, 1. 1 % grep c o n nect / u s r / i n c l u d e /. h / u s r / i n c l u d e / s y s /. h L09 (2017) 25 / 28
26 - : IP, :. in = Internet 1 #i n c l u d e <n e t i n e t / i n. h> / / u s r / i n c l u d e / n e t i n e t / i n. h / 2 3 s t r u c t s o c k a d d r i n { 4 / / 5 s a f a m i l y t s i n f a m i l y ; / / 6 i n p o r t t s i n p o r t ; / / 7 s t r u c t i n a d d r s i n a d d r ; / I P / 8 char s i n z e r o [ 8 ] ; / / 9 } s t r u c t i n a d d r { 12 i n a d d r t s a d d r ; / 16 I P / 13 } sock_addr socket.h. /usr/include/*/sys/socket.h L09 (2017) 26 / 28
27 - 1 / I P, 32, 2 long i n e t a d d r ( char d o t i p ) ; 3 char i n e t n t o a ( long i n t e g e r i p ) ; ntohl, htonl, ntohs, htons (x86 ) ( ). network to host, long/short II L09 (2017) 27 / 28
28 (1-502), 4(1-502) L10, Learn Math Moodle,. L09 (2017) 28 / 28
29 L10( Tue) : Time-stamp: Thu 06:54 JST hig., make recv/send L10 (2017) 1 / 21
30 I swallow.math.ryukoku.ac.jp:13 = :13 = : ( = ) (well-known ports), :. :,. socket, connect, recv/send, shutdown, close. L10 (2017) 2 / 21
31 9 10 Makefile L10 (2017) 3 / 21
32 daytime :,, Sun 13:27. RFC Protocol ( ).. TCP, IP, HTTP P Protocol P. HTTP penguin count, (c), c Adelie Penguins!. Penguins!., : echo : http(s).,, Web API. L10 (2017) 4 / 21
33 ( ) 1 #i n c l u d e <s t d i o. h> 2 #i n c l u d e <s t r i n g. h> / memset / 3 #i n c l u d e <s y s / s o c k e t. h> / s o c k e t, c o n n e ct / 4 #i n c l u d e <arpa / i n e t. h> / htons / 5 #i n c l u d e <n e t i n e t / i n. h> / htons, i n e t a d d r / 6 #i n c l u d e <u n i s t d. h> / c l o s e s i z e o f / 7 #i n c l u d e < s t d l i b. h> 8 9 #d e f i n e SERVER ADDR #d e f i n e SERVER PORT #d e f i n e BUFFERSIZE i n t main ( ) { i n t s ; 16 s t r u c t s o c k a d d r i n sa ; 17 i n t count ; 18 char r e c v b u f [ BUFFERSIZE ] ; L10 (2017) 5 / 21
34 19 char s e n d b u f []= count something. ; 20 i n t s t a t u s ; / / 23 s = s o c k e t ( AF INET, SOCK STREAM, 0 ) ; 24 i f ( s== 1 ){ 25 p e r r o r ( s o c k e t ) ; 26 e x i t ( 1 ) ; 27 } / : / 30 memset(&sa, 0, s i z e o f ( sa ) ) ; 31 sa. s i n f a m i l y=af INET ; 32 sa. s i n p o r t=htons (SERVER PORT ) ; 33 sa. s i n a d d r. s a d d r=i n e t a d d r (SERVER ADDR ) ; / = open / 36 s t a t u s=c o n nect ( s, ( s t r u c t s o c k a d d r )& sa, s i z e o f ( sa ) ) ; 37 i f ( s t a t u s == 1){ 38 p e r r o r ( penguin connect ) ; 39 e x i t ( 1 ) ; L10 (2017) 6 / 21
35 40 } / p r i n t f / 43 count=send ( s, sendbuf, s t r l e n ( s e n d b u f ), 0 ) ; 44 i f ( count== 1 ){ 45 p e r r o r ( penguin send ) ; 46 e x i t ( 1 ) ; 47 } / s c a n f / 50 count=r e c v ( s, r e c v b u f, BUFFERSIZE 1, 0 ) ; 51 i f ( count== 1 ){ 52 p e r r o r ( penguin r e c v ) ; 53 e x i t ( 1 ) ; 54 } / / 57 r e c v b u f [ count ]= \0 ; 58 p r i n t f ( %s, r e c v b u f ) ; / c l o s e / L10 (2017) 7 / 21
36 61 62 s t a t u s=shutdown ( s, SHUT RDWR ) ; 63 i f ( s t a t u s == 1){ 64 p e r r o r ( penguin shutdown ) ; 65 e x i t ( 1 ) ; 66 } s t a t u s=c l o s e ( s ) ; 69 i f ( s t a t u s == 1){ 70 p e r r o r ( penguin c l o s e ) ; 71 } r e t u r n 0 ; 74 } L10 (2017) 8 / 21
37 9 10 Makefile L10 (2017) 9 / 21
38 ex. syntax error ex. segmentation fault,. : return,,., stdlib.h void exit(int status),, OS. 0.. L10 (2017) 10 / 21
39 socket, connect, recv, send., OS II ( OS Linux ) / (Linux).,,, perror(3), man 3 perror, (, ) L10 (2017) 11 / 21
40 perror perror( );,, errno + + : + stderr. 1 #i n c l u d e <s t d i o. h> 2 void p e r r o r ( char s ) ; perror(3), (if-then),, #include <errno.h>, int errno, char *sterror(int errno). perror.,,. fprintf ( stderr, something ) ( II) L10 (2017) 12 / 21
41 s=s o c k e t (... ) ; i f ( s== 1){ / ; / } / s, s o c k e t ( 2 ) / / s o c k e t ( i f ( s o c k e t (...)== 1 ){ / ; /} / s o c k e t s / i f ( ( s=s o c k e t (... ) ) == 1 ){ / ; /} (a=f())==2., a=(f()==2), a 0 1 ( if ) C,, i f ( 1==do something ( ) ) d i e ( ) ;. OR. Get up or you will be late. ( ( 1==do something ( ) ) ( d i e ( ) ) ) ; exception( ), try-catch in Java (3 ) L10 (2017) 13 / 21
42 Makefile 9 10 Makefile L10 (2017) 14 / 21
43 Makefile Makefile,, 1 i f ( ()== ){ 2 p e r r o r ( ) ; 3 e x i t ( 1 ) ; 4 }. + +Makefile ( ) 1 p e r r o r ( ) ; 2 e x i t ( 1 ) ;, void die(char message). die.h, die.c, Makefile. Refactoring ( ),,, L10 (2017) 15 / 21
44 9 10 Makefile L10 (2017) 16 / 21
45 telnet telnet(1), nc(1) t e l n e t nc C host port host port,. telnet Control ], quit + Enter. nc Control C. t e l n e t www. a. math. ryukoku. ac. j p 80 GET /, Web URL 80? m L10 (2017) 17 / 21
46 t e l n e t www. math. ryukoku. ac. j p 80 #a r g v [ 0 ] a r g v [ 1 ] a r g v [ 2 ] a r g c= ( 1, 2).,, man., -c, --help -,. t a i l penguin c l i e n t. c t a i l 30 penguin c l i e n t. c t a i l r 30 penguin c l i e n t. c L10 (2017) 18 / 21
47 C main i n t main ( i n t argc, char a r g v ){... } argc.. argv ( )., argv[0] t e l n e t \0 argv[1] w w w. m a t \0 argv[2] 8 0 \0 L10 (2017) 19 / 21
48 1 #i n c l u d e <s t d i o. h> 2 #i n c l u d e <s t r i n g. h> 3 #d e f i n e BUFSIZE i n t main ( i n t argc, char a r g v ){ 6 char message [ BUFSIZE ] ; 7 char a n d s t r i n g []= and ; 8 9 s t r c p y ( message, a r g v [ 1 ] ) ; 10 s t r c a t ( message, a n d s t r i n g ) ; 11 s t r c a t ( message, a r g v [ 2 ] ) ; / f o r t e s t / 14 / p r i n t f ( %c \n, a r g v [ 0 ] [ 0 ] ) ; / 15 / p r i n t f ( %c \n, a r g v [ 0 ] [ 1 ] ) ; / 16 / p r i n t f ( % s \n, a r g v [ 0 ] ) ; / p r i n t f ( %s \n, message ) ; r e t u r n 0 ; 21 } L10 (2017) 20 / 21
49 (1-502), 4(1-502) L11.,,, Learn Math Moodle,. L10 (2017) 21 / 21
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L10(2017-12-05 Tue) : Time-stamp: 2017-12-17 Sun 11:59 JST hig. recv/send http://hig3.net ( ) L10 (2017) 1 / 21 IP I swallow.math.ryukoku.ac.jp:13 = 133.83.83.6:13 = : IP ( = ) (well-known ports), :. :,.
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