client module 思维导图模板_ProcessOn思维导图、流程图

ns_interfce_listenudp

ns_clientmgr_createclients

client_create

event_init(client_start)

tcp   client_accept

udp   client_udprecv

event_recv   client_request

event_send  client_done

dns_message_create

ns_interface_accepttcp

client 结构示意重要说明

<div>opt 类型: rdataset,对应dns message opt.</div><div>填充数据的数据结构为rdata</div><div>rdata说明</div><div>struct dns_rdata {</div><div>        unsigned char *                 data;</div><div>        unsigned int                    length;</div><div>        dns_rdataclass_t                rdclass;</div><div>        dns_rdatatype_t                 type;</div><div>        unsigned int                    flags;</div><div>        ISC_LINK(dns_rdata_t)           link;</div><div>};</div><div><br></div><div>作用:作为回应包的opt选项填充</div><div>由函数client_addopt实现</div>

query

<div>struct ns_query {</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>unsigned int<span class="Apple-tab-span" style="white-space:pre"> </span>attributes;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>unsigned int<span class="Apple-tab-span" style="white-space:pre"> </span>restarts;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>isc_boolean_t<span class="Apple-tab-span" style="white-space:pre"> </span>timerset;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_name_t *<span class="Apple-tab-span" style="white-space:pre"> </span>qname;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_name_t *<span class="Apple-tab-span" style="white-space:pre"> </span>origqname;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>unsigned int<span class="Apple-tab-span" style="white-space:pre"> </span>dboptions;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>unsigned int<span class="Apple-tab-span" style="white-space:pre"> </span>fetchoptions;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_db_t *<span class="Apple-tab-span" style="white-space:pre"> </span>gluedb;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_db_t *<span class="Apple-tab-span" style="white-space:pre"> </span>authdb;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_zone_t *<span class="Apple-tab-span" style="white-space:pre"> </span>authzone;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>isc_boolean_t<span class="Apple-tab-span" style="white-space:pre"> </span>authdbset;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>isc_boolean_t<span class="Apple-tab-span" style="white-space:pre"> </span>isreferral;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>isc_mutex_t<span class="Apple-tab-span" style="white-space:pre"> </span>fetchlock;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dns_fetch_t *<span class="Apple-tab-span" style="white-space:pre"> </span>fetch;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>isc_bufferlist_t<span class="Apple-tab-span" style="white-space:pre"> </span>namebufs;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ISC_LIST(ns_dbversion_t)<span class="Apple-tab-span" style="white-space:pre"> </span>activeversions;</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ISC_LIST(ns_dbversion_t)<span class="Apple-tab-span" style="white-space:pre"> </span>freeversions;</div><div>};</div>

client封装过程

event-recv

<div>socketevent</div><div>struct isc_socketevent {</div><div>        ISC_EVENT_COMMON(isc_socketevent_t);</div><div>        isc_result_t            result;         /* OK, EOF, whatever else */</div><div>        unsigned int            minimum;        /* minimum i/o for event */</div><div>        unsigned int            n;              /* bytes read or written */</div><div>        unsigned int            offset;         /* offset into buffer list */</div><div>        isc_region_t            region;         /* for single-buffer i/o */</div><div>        isc_bufferlist_t        bufferlist;     /* list of buffers */</div><div>        isc_sockaddr_t          address;        /* source address */</div><div>        isc_time_t              timestamp;      /* timestamp of packet recv */</div><div>        struct in6_pktinfo      pktinfo;        /* ipv6 pktinfo */</div><div>        isc_uint32_t            attributes;     /* see below */</div><div>        isc_eventdestructor_t   destroy;        /* original destructor */</div><div>};</div><div>从socket获取的数据，放在region</div>

确定buf指针，指向regoin

<div>dns_message_peekheader,查看是请求还是应答</div><div>应答就下放给dispather</div>

<div>dns_message_parse,解析请求数据包</div><div>将包解析并填充message结构，header如图</div>

client_request

query   ns_query_start

query_find(client)

process

query_addrrset

query_send

ns_client_send

dns_compress_init

dns_message_renderbegin

dns_message_setopt

dns_message_rendersection

<div>分别填充</div><div>DNS_SECTION_QUESTION</div><div>DNS_SECTION_ANSWER</div><div>DNS_SECTION_AUTHORITY</div><div>DNS_SECTION_ADDITIONAL</div><div><br></div>

dns_message_renderend

 client_sendpkg

ns_client_next

exit_check

query_getdb(client)

query_getzonedb

dns_zt_find

dns_rbt_findname

dns_rbt_findnode

dns_name_fullcompare

dns_db_find(dns_db)

imp-zone_methods|cache_methods

<div>static dns_dbmethods_t zone_methods = {</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>attach,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>detach,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>beginload,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>endload,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>dump,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>currentversion,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>newversion,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>attachversion,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>closeversion,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>findnode,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>zone_findzonecut,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>attachnode,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>detachnode,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>expirenode,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>printnode,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>createiterator,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>zone_findrdataset,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>allrdatasets,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>addrdataset,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>subtractrdataset,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>deleterdataset,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>issecure,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>nodecount,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>ispersistent,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>overmem,</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>settask</div>

zone_find<br>

(dns_db转换类型为dns_rbtdb) @rbtdb.c

dns_rbt_findnode(dns_rbt)

query_addrrset

dns_message_findname

query_addrdataset

(master|xfrout.c)ns_xfr_start

get start serial,end serial,find jouranl,bindstream,

sendstream

[recv]    update  ns_update_start

send_update_event

update_action

cname|cname_incompatible_rrset_exists

cname,ns  exculde|rrset_exists

do_diff

diff_apply

dns_journal_write_transaction

dns_journal_begin_transaction

*dns_journal_writediff[写日志文件注意转化为line线路标示]

dns_journal_commit

notify  ns_notify_start

[recv]    update dns_message_parse

getsection

newrdata

xfrout.c[recv][master] ns_xfr_start

*sendstream

dns tree struct

<div>     TLD domain<span class="Apple-tab-span" style="white-space: pre;"> </span>     chain</div><div>--------------------------------------<span class="Apple-tab-span" style="white-space:pre"> </span>  |</div><div>wwww     www       mail            next<span class="Apple-tab-span" style="white-space:pre"> </span>  |</div><div>--------------------------------------<span class="Apple-tab-span" style="white-space:pre"> </span>  |</div><div>a        abc          test         down <span class="Apple-tab-span" style="white-space:pre"> </span>          |</div><div>--------------------------------------<span class="Apple-tab-span" style="white-space:pre"> </span>  |</div><div>*<span class="Apple-tab-span" style="white-space:pre"> </span>wild<span class="Apple-tab-span" style="white-space:pre"> </span>                  |</div><div>--------------------------------------             node</div>

dns_zone_load

zone_load

dns_db_create

zone_startload

dns_db_beginload|主要完成callback[*addp = loading_addrdataset,loadp=loadctx]

dns_master_loadfile

load

gettoken

isc_lex_gettoken

dns_rdataclass_fromtext

COMPARE in

find line

coverto uint

*[master.c]|dns_rdata_fromtext

*commit

loading_addrdataset

dns_rdataslab_fromrdataset

add<br>

dns_db_endload

zone_postload

[send]  update nsupdate

setup_system

getinput

user_interaction

get_next_command

evaluate_update

update_addordelete

start_update

zone && server is sure |send_update

[normal] sendrequest,query soa

sendrequest

dns_request_createvia3

recv response

recvsoa

send_update

dns_request_createvia3

<div>dns_message_rendersection</div><div>DNS_SECTION_UPDATE  默认是DNS_SECTION_AUTHORITY</div>

<div>*add_rr_prepare_action</div><div>先比较rdata值是否相等</div><div><br></div><div>1(rdata值重复的记录值并且ttl也相等的,不添加,忽略不提示,直接返回)</div><div>2 对于type为cname,dname,soa,nsec 这类解析,只能存在一个,</div><div>  如果要添加,必须先删除已经存在的，再添加新值</div><div>3 对于ttl不等的,删除原有解析值，然后如果记录值也不等的,添加新解析值</div>

dns_zone_dump

[masterdump.c]dns_master_dump

dumptostreaminc

使用dbiterator来封装数据

allrdatasets

dump_rdatasets

dump_done

*dns_journal_compact(注意jnl文件的体积)

xfr

[slave ] in

[master] out

journal

read_one_rr|journal.it加一个line,文件写线路名字,读的时候转换成line数字表达<br><div>header{</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>{format【16】</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>begin</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>end</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>indexsize<span class="Apple-tab-span" style="white-space:pre"> </span>   有几条记录</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>}union<span class="Apple-tab-span" style="white-space:pre"> </span>h</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>pad[64]</div><div>}</div><div>rawpos {</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>serial[4]</div><div><span class="Apple-tab-span" style="white-space:pre"> </span>offset[4]</div><div>} </div><div>journal format</div><div><br></div><div>header|rawpos|rawpos|...indexsize..|rawpos|</div><div><br></div><div> </div>