Yosungirako chitetezo IMAP

Ndi kufala kwa luso zambiri amakhala ofunika chitetezo nkhani. Ndipo ife kugwira ntchito kupyolera mbali zosiyanasiyana ndi kulemekeza zochitika zosiyanasiyana. Apa Mwachitsanzo, IMAP chitetezo - chiyani icho? Odalilika ndi Internet Uthenga Access Protocol? Umene ali ndi mwayi, zimene akufotokozera, kodi Mabaibulo osiyanasiyana komanso limagwirira ntchito - ichi ndi retelling mwachidule nkhani za nkhaniyi, chimene inu tsopano kuyambapo.

IMAP ndi chiyani?

m'makalata chitetezo ndi zofunika chifukwa chakuti mwina muli mfundo zothandiza. protocol amagwiritsidwa ntchito pa ntchito wosanjikiza kupereka mwayi kwa deta imelo anthu okhawo amene ayenera kulandira izo. Iwo anayamba kupanga zochokera TCP ndipo amagwiritsa zosowa zawo 143 doko. IMAP amalola wosuta ntchito ndi Mail, limene lili pa makina chapakati. Pulogalamu kuti amagwiritsa protocol ichi, amachita kuchita zinthu zogwirizana kuti kuganiza kuti makalata onse ali pa kompyuta malangizo. A buku mkulu wa magalimoto wapadera IMAP Seva angagwiritsidwe ntchito. Mpheto makalata sikutanthauza owona zonse kusamukira wolandira, imene pali nkhani. Koma uwu si protocol yekha kuti ntchito ntchito yotumiza. Mwachitsanzo, kutumiza uthenga ntchito SMTP, monga gulu anatumiza kwa chitetezo IMAP sangamvetse sitingakumane. Pali vulnerabilities kudziwika.

Chifukwa IMAP protocol anayamba kupanga?

Iwo anayamba kupanga njira ina POP3. Zonse zinayamba chifukwa cha zolakwa za mtsogolo. Choncho, iwo alibe mphamvu kusamalira, kusuntha, ndipo mauthenga sitolo pa makina. Ndicho chifukwa ichi ndi protocol IMAP wakhala Itakwana amapereka mwayi wolandira maimelo mu malo osiyana ndi kasungidwe deta pa makina akumidzi.

Ubwino pa POP3

Chifukwa protocol ichi chinali kugwiritsidwa ntchito? Popeza kuti anatipasa IMAP e-mail, kuwonjezera pa pamwamba, koma m'njira zambiri:

1. Musati kusagwirizana mpaka yogwira mawonekedwe wosuta.
2. Mauthenga dawunilodi pokhapokha ngati pali zofunikira zolunjika kuchokera kasitomala.
3. Mwina munthawi yomweyo kupeza anthu angapo, aliyense wa iwo adzatha mungawononge kusintha zonse.
4. Kasitomala akhoza kulenga, kusintha, ndi kuchotsa dzina la mabokosi, ndipo kusuntha mauthenga pakati pawo. Komanso, ngati muli IMAP kutambasuka 4 Access Control List, mungathe kusintha zilolezo za.
5. Mukhoza younikira udindo wa uthenga (awerengedwa, zichotsedwa, anatumiza Poyankha, etc.). tsatanetsatane wa zimenezi zimatchedwa mbendera ndipo amasunga maseva.
6. Pezani mauthenga nthawizonse anachita pa makina ndipo pali limagwirira bwino chifukwa kukula.

Mauthenga ndi makhalidwe awo

IMAP amapereka ntchito chitetezo yekha ndi uthenga, ndipo iwo safuna mapaketi aliyense ndi maheda wapadera. Aliyense wa iwo ali ndi makhalidwe yake. Iwo akhoza kumatanthauza payekha kapena pamodzi ndi ena. Pa nthawi, pali Mabaibulo sikisi protocol ndi IMAP, koma nthawi ntchito otsiriza a iwo okha.

UID

Uthenga uliwonse amalandira kachidindo 32-bit. Kuti izi anawonjezera dzina lapadera. Pamodzi kupanga ndondomeko 64-bit, amene chofunika kudziwa uthenga. Ndicho IMAP chitetezo. The patapita adadza, zofunika kwambiri ndi UID. chizindikiro ichi ntchito monga kachidindo ayankhe pamene mukusankha olandirira makalata. Iye samasintha pa gawoli kapena pakati pawo. Ngati zinthu luso amafuna kusintha kwa chizindikiro ichi, UID ayenera kukhala woposa kale. Ntchito kufala deta ali yemweyo IMAP doko.

The siriyo chiwerengero cha uthenga

Imayamba ndi chimodzi. chiwerengero cha uthenga uliwonse wotsatira ndi incremented ndi 1, poyerekeza anthu m'mbuyomo. An kusiyana chiyani pa bokosi la makalata kuti angathe kusintha pa kulumikiza gawo: Mwachitsanzo, pamene kwathunthu pochotsa maimelo.

mbendera Posts

chikhumbo Zikuoneka kuti mndandanda umene pali ziro kapena zambiri dzina lake zizindikiro zimene chilamulira chikhalidwe ndi mfundo zofunika kwambiri. Mitundu IMAP 4.1 awiri a mbendera akhala anayambitsa. Iwo amagwira ntchito yochepa (pa gawoli), kapena kukhala okhazikika. System otchedwa mbendera, dzina limene limanenedwa mu protocol mfundo. Iwo onse ayenera kuyamba ndi kuyamba \. Pano palibe dongosolo ngati mbendera akhala kuzindikiridwa:

1. \ Mwaona - uthenga kuwerenga;
2. \ Kuyankha - kutumiza yankho;
3. \ Recent - uthenga anaonekera pa gawo panopa;
4. \ Choyesera - unali wotchuka monga kusodza;
5. \ Flagged - wosuta ali amalembedwa uthenga n'chofunika;
6. \ Chachotsedwa - akumidzi.

Tsiku mkati ndi nthawi ya uthenga

Kodi kufotokoza mfundo zimene ziyenera kukhala mwa magawo awa? Ngati uthenga aperekedwa pogwiritsa ntchito protocol SMTP, amatengedwa nthawi ndi tsiku la kokafikira. Ngati inu ntchito buku lamulo, magawo ntchito ndi sender lapansi. Inu mukhoza kukhala ndi nthawi ndi tsiku - ichi ntchito lamulo append.

Server ndi kasitomala nkhani

Pamene ntchito IMAP kulankhulana amapezeka pokhazikitsa kasitomala-Seva mfundo. Choncho, poyamba pa zonse yekha amatumiza malamulo, ndipo chachiwiri amatumiza deta anapempha komanso mfundo za kuphedwa kwa pempho. Mauthenga onse ndi maonekedwe a chingwe chimenecho umatha ndi ndondomeko yapadera. Akuphedwa njira zonse akuyamba mwa magulu kasitomala. Iwo amazindikira chifukwa wapadera manambala oyambirira dzina (yomwe imateteza yochepa alphanumeric chingwe) wotchedwa chizindikiro a. Aliyense timu ali yake yapadera chiwerengero.

Mwina milandu ziwiri zimene deta anatumizidwa ndi kasitomala si wathunthu. The choyamba - mtsutso amaperekedwa ndi malamulo kale anatsimikiza chiwerengero cha octets umene uli Troc. Chachiwiri - amafuna ayankhe makina. Nthawi zonse, kasitomala amalandira pempho kupitiriza gulu, amene kwenikweni akuyamba ndi khalidwe ngati +. Mu chochitika chiphaso cha inayake kutengerapo ayenera kutha ndi deta, mwinamwake kudzakhala kotheka kuyamba ndondomeko yatsopano. Kuwerenga, kusanthula magawo Kusankha ndi kutengerapo deta protocol Seva imagwiridwa ndi wolandila lapansi. Pamene processing lamulo udzatha, kasitomala watumidwa kuyankha zindikirani ichi. Information kuti silimanena akamaliza malangizo amaperekedwa ndi manambala oyambirira *. Njirayi imatchedwa mayankho untagged. Kusiya zomanga maseva deta monga atamupempha munapangana kapena kanthu yake. mtundu awo zimadalira pa chifukwa iwo anatumizidwa.

Ndipo kodi tinganene chiyani za misonkhano otchuka, monga Gmail? Zokonda IMAP ogwiritsa wamba palibe, koma mukhoza pamene kutumiza kalata kudzera kasitomala wapadera. Koma izi mwangwiro basi kupita kulemba.

Ndipo chimene chiri zofunika chiyani? Amanenera bwino / kulephera mfundo. Poyankha nthawi ndi nthawi ntchito kuti chizindikiro chomwecho chimene makasitomala wagwiritsa ntchito gulu kuti anapezerapo ndondomekoyi. Choncho n'zotheka kusintha multithreading deta, ndipo iwo si lofanana ndi iwo eni. mitundu itatu ayankhe Seva anawapanga kulongosola zinthu:

1. Wopambana kuphedwa.
2. Ndithu.
3. IMAP zolakwa protocol (kumachitika pamene lamulo osadziwika umagwiritsidwa, kapena makina kuzindikira kuti pali vuto ndi malembedwe a).

Kasitomala mbali ndi kuti ayenera kukonzekera kusamalira ayankhe aliyense amene abwera kwa iye. Izi zifunika kulembedwa mwa njira yotero kuti kasitomala anali kuzigwiritsira ntchito mwachindunji, kutumiza Seva lookups poponya. Onani ngati mungathe Gmail. Zokonda IMAP akhoza losasinthika kapena kusinthidwa chifukwa makasitomala makalata ndi magwiridwe waukulu.

Pomaliza

protocol Izi chitetezo akhoza kwambiri bwino deta zodalirika, ndipo angapereke chitsimikizo yokulirapo kuti gulu lina sadzatha kupeza mfundo. Koma izi sizikutanthauza kuti munthu wina sangathe kuwerenga kalatayo. Ikhoza osatetezeka amakhalabe polumikiza, ndi wosuta akhoza chifukwa Kudziŵa otsika za zoberana zidule panokha kuwapatsa zonse zofunika kuti kulumikiza makalata.