milter介绍.ppt

Milter介绍 Sendmail Content Management API Open source Sendmail 8.12 and later Postfix 2.3开始支持Milter协议 Postfix 2.4支持sendmail 8.13.0所有的请求接口 Postfix2.6后支持所有sendmail 8.14.0所有请求接口 功能 enables third-party programs to access mail messages as they are being processed by the Mail Transfer Agent (MTA) allows them to examine and modify message content and meta-information during the SMTP transaction SMTP 和milter对应关系 工作原理 The lifetime of a connection is bracketed by calls to the callbacks xxfi_connect and xxfi_close Each message is bracketed by calls to xxfi_envfrom and xxfi_eom (or xxfi_abort) API Library Control Functions Data Access Functions Message Modification Functions Callbacks Other Message Handling Functions Library Control Functions Data Access Functions Message Modification Functions Other Message Handling Functions Callbacks Miscellaneous milter DKIM Milter * SMTP Commands Milter Callbacks (open SMTP connection) xxfi_connect HELO ... xxfi_helo MAIL From: ... xxfi_envfrom RCPT To: ... xxfi_envrcpt [more RCPTs] [xxfi_envrcpt] DATA xxfi_data Header: ... xxfi_header [more headers] [xxfi_header] xxfi_eoh body... xxfi_body [more body...] [xxfi_body] . xxfi_eom QUIT xxfi_close (close SMTP connection) For each of N connections { For each filter process connection (xxfi_connect) For each filter process helo (xxfi_helo) MESSAGE:For each message in this connection (sequentially) { For each filter process sender (xxfi_envfrom) For each recipient { For each filter process recipient (xxfi_envrcpt) } For each filter { process DATA (xxfi_data) For each header process header (xxfi_header) process end of headers (xxfi_eoh) Fo