I see.
Thank you very much!
2007/12/10, Tomasz Sterna <[EMAIL PROTECTED]>:
>
> On Pn, 2007-12-10 at 21:55 +0800, 杨帅 wrote:
> > 1 About sx_raw_write(sx_t s, char* buf, int len) function.
> > This function is invoked by xxx_time_checks() function, for
> > example _router_time_checks in the file main.c(router).
> > I see that the sentence "sx_raw_write(target->s, " ", 1)" want
> > to check the connection with other components.
>
> This is so-called "TCP keepalive".
> You see sometimes when the TCP connection is torn down by a routing
> party, only one of the sides of the connection is informed and closed
> properly (ex. c2s end). The other side "thinks" the connection is still
> open, just does not transmit any data.
>
> Thus sending a whitespace character through torn connection would result
> in error, effectivly closing the connection at the sending TCP stack and
> informing the application that the connection is broken.
>
> > As usual, when other component(eg c2s) receviev the "conncetion
> > test message", it should response some message for it.
> > But I can't find where c2s process the "connection test
> > message"
>
> As you see in the above explanation, there is no need for any c2s
> answer, because it is expected to just went through or be handled (as an
> error) in TCP stack.
>
> There exist XMPP-Ping XEP, but I think it's to heavy to be used as a
> keepalive. Single whitespace character in between stanzas is enough and
> effective.
>
>
> > 2 About the value of comp->s->auth_id.
> > In the implementation of fuction _router_process_bind
> >
> > a) user = strdup(comp->s->auth_id);
> > b) c = strchr(user, '@');
> > c) if(c != NULL) *c = '\0'; if(strcmp(user, name->domain) != 0
> > && !aci_check(comp->r->aci, "bind", user)) {
>
> This code extracts the username from the JID, to compare it against ACI.
> It first duplicates the auth_id (a), then searches for the '@' character
> in the duplicate (b) and if found (c) chomps the string by inserting NUL
> in place of the at-sign (c).
>
> > We can presume that the value of comp->s->auth_id equals
> > name->domain's value. For example, name->domain is "c2s",then
> > comp->s->auth_id is also "c2s .
>
> No. In case of to-router connections it's always
> [EMAIL PROTECTED] By default setup all components use
> 'jabberd' username.
>
>
> --
> /\_./o__ Tomasz Sterna
> (/^/(_^^' Xiaoka.com
> ._.(_.)_ XMPP: [EMAIL PROTECTED]
>
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