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ttcp —

?ȥ??󥹥ߥå????󥳥??ȥ??????ץ??ȥ????Υȥ??󥶥?????????ĥ??ǽ #include <sys/types.h> #include <sys/socket.h> #include <netinet/in.h> #include <netinet/tcp.h> int setsockopt(sock, IPPROTO_TCP, TCP_NOPUSH, &One, sizeof One)
ssize_t sendto(sock, msg, len, MSG_EOF, &sin, sizeof sin)
ssize_t sendto(sock, msg, len, MSG_EOF, 0, 0)

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T/TCP ?? TCP ?ץ??ȥ??? ( tcp(4) ?򻲾?) ?ؤγ?ĥ??ǽ?ν????Ǥ??? ?ܵ?ǽ?ˤ??꾯?̤Υǡ????? 2 ?ĤΥѥ??åȤθ򴹤Ǥ????Ȥꤹ?뤳?Ȥ??Ǥ??? ???ä?ɸ???? TCP ???ͥ?????????????ȯ??????;ʬ?ʱ????ˤ????ٱ???̵???????Ȥ??Ǥ??ޤ??? ?????åȥ??󥿥ե??????? T/TCP ?򥵥ݡ??Ȥ????褦?˽????????Ƥ??ꡢ ?ޤ??????Ǥ????Τʥ??????ˤĤ??ƾܽҤ??Ƥ??ޤ??? ?ץ??ȥ????˰?¸???ʤ???ʬ?Υ??ݡ??ȤˤĤ??Ƥ? socket(2) ?ڤ? send(2) ?Υޥ˥奢???ڡ????ǽҤ٤????Ƥ??ޤ??? T/TCP ?? RFC 1644 ???????????Ƥ??ޤ???

T/TCP ?????Υ??ͥ????????????????????Ȥˤ????ơ????륪?ץ??????? ?????Ĥ??ޤ??뤳?Ȥˤ??ꡢT/TCP ??ĥ?ϵ?ǽ???ޤ??? ?????ˤ??????ȤΥۥ??ȴ֤Ǥκǽ?????³?????????Ƥ? 3 ???????ϥ??ɥ?????????̵???????Ȥ??Ǥ??ޤ??? ??????Ʊ?????ץ????????Ѥ??ơ? ?Ť???ʣ?????ѥ??åȤ??????μ¤?Ƚ?̤??뤳?Ȥ???ǽ?Ǥ??ꡢ ???ä? TCP ?ץ??ȥ??뤬??³???Ĥ????塢???֤??ݤ??ʤ????Фʤ??ʤ? ???֤򸺤餹???Ȥ??Ǥ??ޤ??? “net.inet.tcp.rfc1644” ?? MIB ???ѿ??ϼ¹Ի??? T/TCP ?ͥ???????????????̵???????뤿???˻??Ѥ??뤳?Ȥ??Ǥ??ޤ??? ???????ʤ??顢?ܥץ??ȥ????ϡ?T/TCP ?ǤϤʤ??????ƥब T/TCP ??ĥ???줿?????ƥ????̿????褦?Ȥ????Ȥ??ˡ? ??ưŪ??ɸ???? TCP ???ᤷ???̿????뤳?Ȥ??ݾڤ??뤿?????߷פ??줿???ΤǤ???

?ȥ??󥶥??????????ǥ?

T/TCP ???Ѥ??????? “?ȥ??󥶥???????” ?Υ??ǥ??Ϥ??ʤ?ñ???ʤ??ΤǤ?:

???饤?????ȥץ????????ϥ????Ф??????????׵??????????ޤ??? ??????ñ???? TCP ?????????Ȥ˼??ޤ뤯?餤??ʬ?????ʤ??ΤǤ??? ?????ƥ??ץ??????ȥǡ????ȶ??? SYN PUSH FIN ?????????Ȥ򥵡??Ф??????ޤ???
?????Хץ?????????ɸ???? TCP ??³??Ʊ?ͤˡ??׵??????????????ɤ??? ñ???Υ????????Ȥ˼??ޤ??礭???α????????????ޤ??? ?????׵᤬ T/TCP ?ξ??硢 ?????ϡ?(?ۤʤä?) ???ץ??????ȥǡ????ȶ??? ñ???? SYN PUSH FIN ACK ?????????Ȥǥ??饤?????Ȥ??֤????ޤ??? T/TCP ?ǤϤʤ??????ϡ? (?ۤ?) ?̾??? TCP ???ᤵ?줿??³?ˤʤ??ޤ??? ?????ФϤ??λ? T/TCP ?????åȤ򥯥????????ޤ???
???饤?????Ȥϱ??????ɤ߹??ߡ??????åȤ򥯥????????ޤ???

???饤?????ȥ??ݡ???

???饤??????¦?Υ??ݡ??Ȥϡ? “???ۤ???³” ?ڤ? “?????ȥ????åȥ?????” ?γ?ǰ?????򤹤??ͤ? sendto(2) ?ڤ? sendmsg(2) ?????ƥॳ?????ΰ?̣????ĥ???뤳?Ȥˤ????󶡤????ޤ??? ?ȥ??󥶥????????ˤ????׵????????????ˤ? sendto(2) ?????ƥॳ???????̾????Ѥ????????????ͤˤ??ޤ?:

char request[REQ_LEN];
struct sockaddr_in sin;
int sock, req_len;

sock = socket(PF_INET, SOCK_STREAM, 0);

/* request[] ?? sin ?ν??? */

err = sendto(sock, request, req_len, MSG_EOF,
	(struct sockaddr *)&sin, sin.sin_len);

/* ???顼???? */

req_len = read(sock, request, sizeof request);
close(sock);

/* ???????? */

sendto() ???ƤӽФ??ȡ????λ??Υ????åȤξ??֤? connect(2) ?ڤ? shutdown(2) ?????ƥॳ???뤬?Ȥ??줿???? Ʊ?????֤ˤʤ뤳?Ȥ????դ??Ʋ??????? ?Ĥޤꡢ???Υ????åȾ??Ǽ¹Ԥ????Τ?Ŭ?????????ϡ? read(2) ?????? close(2) ?????Ǥ? (???饤?????Ȥ? TCP ???????Ϥ??Ǥ˥????åȥ????󤵤??Ƥ????Τǡ? ???Υ????åȤ?¾?????????? connect(2) ???뤳?ȤϤǤ??ޤ???)??

?????Х??ݡ???

T/TCP ?????Ѥ????ݤ˥????Ф????Ѳ?ǽ?ʥ??ץ??????? 2 ?Ĥ????ޤ?:

TCP_NOPUSH ?????åȥ??ץ??????򥻥åȤ??? ɸ???? write(2) ?????????ȤäƱ??????ԤäƲ???????
???饤?????Ȥξ?????Ʊ?ͤˡ? sendto(2) ?? MSG_EOF ?ե饰?ȶ??˻??Ѥ??Ʋ??????? ???????????????ϻ??ꤷ?ޤ?????

??¸?Υ????Ф? T/TCP ??ĥ??ǽ?????Ѥ????褦???ѹ????Ԥ??ݤˤϡ? ?ǽ??Υ??ץ????????Ѥ????Τϰ???Ū?????????????Ǥ??? ñ???? setsockopt(sock, IPPROTO_TCP, TCP_NOPUSH, &One, sizeof One) (?????? One ?? 0 ?ʳ????ͤ????????ѿ??Ǥ?) ?ؤΥ????????ɲä??????????????Ǥ??? ?????ǡ??????????????????? (?????åȤΥХåե???˰?¤??Ƥ??ʤ??¤?) ??????¦?Υ????åȤ??Ĥ??Ƥ??ʤ????Фʤ??ޤ?????

2 ???ܤΥ??ץ??????ϡ????????????ФˤϤ???˾?ޤ??????ΤǤ??? ?????ˤ??äƤϡ??Ť??????Фˤ?Ŭ?ѤǤ??뤯?餤??ñ?Ǥ??? ???ξ??硢?????ʳ????̾? write() ?θƤӽФ????ޤ??Ǥ??ޤ????? ?????򼡤Τ褦???֤??????ޤ? :

sendto(sock, buf, len, MSG_EOF,
  (struct sockaddr *)0, 0)

???ξ??硢??????ľ?????????????ޤ????????饤?????Ȥξ?????Ʊ?ͤˡ? ?????åȤϤ??λ????ǲ??ˤ????Ѥ??뤳?ȤϽ????ޤ????? ľ???˥??????????٤??Ǥ???

MIB ???ѿ?

T/TCP ??ĥ??ǽ?????Ѥ????ˤϡ? Ŭ?ڤ? TCP ???ץ????????????????褦?? MIB ?ѿ? “net.inet.tcp.rfc1644” ?????Ǥ??뤳?Ȥ?ɬ?פȤ??ޤ??? ?ܺ٤? tcp(4) ?򻲾Ȥ??Ʋ???????

??Ϣ????

send(2), setsockopt(2), inet(4), tcp(4) R. Braden, T/TCP - TCP Extensions for Transactions, RFC 1644.

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T/TCP ?Υ??ݡ??Ȥ? FreeBSD 2.1 ?ǽ????ƹԤ????ޤ????? ?????? The University of Southern California ?? Information Sciences Institute ?? Bob Braden ?? Liming Wei ???񤤤??????ɤ????ˤ??Ƥ??ꡢ The University of Twente ?? Andras Olah ???ܿ????ޤ?????