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some NNTP improvements

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This commit is contained in:
cathugger 2018-01-23 22:32:14 +00:00
parent 8cb044a5e3
commit 337a61dd7f
1 changed files with 68 additions and 50 deletions
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58
contrib/backends/srndv2/src/srnd/nntp.go
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@ -382,18 +382,19 @@ func (self *nntpConnection) handleStreaming(daemon *NNTPDaemon, conn *textproto.
return
}
// check if we want the article given its mime header
// check if we want the article given its auth status and mime header
// returns empty string if it's okay otherwise an error message
func (self *nntpConnection) checkMIMEHeader(daemon *NNTPDaemon, h map[string][]string) (reason string, allow bool, err error) {
func (self *nntpConnection) checkMIMEHeader(daemon *NNTPDaemon, hdr textproto.MIMEHeader) (reason string, allow bool, err error) {
if !self.authenticated {
reason = "not authenticated"
return
}
hdr := textproto.MIMEHeader(h)
reason, allow, err = self.checkMIMEHeaderNoAuth(daemon, hdr)
return
}
// check if we want the article given its mime header without checking auth status
// returns empty string if it's okay otherwise an error message
func (self *nntpConnection) checkMIMEHeaderNoAuth(daemon *NNTPDaemon, hdr textproto.MIMEHeader) (reason string, ban bool, err error) {
newsgroup := hdr.Get("Newsgroups")
reference := hdr.Get("References")
@ -664,9 +665,9 @@ func (self *nntpConnection) handleLine(daemon *NNTPDaemon, code int, line string
} else if cmd == "CHECK" {
// handle check command
msgid := parts[1]
if self.mode != "STREAM" {
// we can't we are not in streaming mode
conn.PrintfLine("431 %s", msgid)
if !self.authenticated {
// if client cannot TAKETHIS it shouldn't be able to CHECK either
conn.PrintfLine("480 You have not authenticated")
return
}
// have we seen this article?
@ -682,25 +683,48 @@ func (self *nntpConnection) handleLine(daemon *NNTPDaemon, code int, line string
}
} else if cmd == "TAKETHIS" {
// handle takethis command
r := bufio.NewReader(conn.DotReader())
if !self.authenticated {
// early reject without parsing incase client not allowed to post
// send response first to allow client to stop sending
// XXX what happens if our send queue is full and this blocks?
// other side will probably fill up sending article to us
// async receive processing would help there
// but this situation has low likehood to happen
// operating system/transport buffering will compensate
// so leave it this way
conn.PrintfLine("480 You have not authenticated")
// discard whole article without looking at insides
// it should be dot-terminated either way
_, err = io.Copy(ioutil.Discard, r)
return
}
// client is allowed to post
var msg *mail.Message
var reason string
var ban bool
// read the article header
r := bufio.NewReader(conn.DotReader())
msg, err = readMIMEHeader(r)
if err == nil {
if err != nil {
log.Println(self.name, "error reading mime header:", err)
conn.PrintfLine("439 %s error reading mime header", msgid)
// if reading header error'd, msg.Body wont be set
_, err = io.Copy(ioutil.Discard, r)
return
}
hdr := textproto.MIMEHeader(msg.Header)
// check the header
reason, ban, err = self.checkMIMEHeader(daemon, hdr)
reason, ban, err = self.checkMIMEHeaderNoAuth(daemon, hdr)
if len(reason) > 0 {
// discard, we do not want
code = 439
log.Println(self.name, "rejected", msgid, reason)
conn.PrintfLine("439 %s %s", code, msgid, reason)
_, err = io.Copy(ioutil.Discard, msg.Body)
if ban {
err = daemon.database.BanArticle(msgid, reason)
}
} else if err == nil {
// looks good to accept
// check if we don't have the rootpost
reference := hdr.Get("References")
if reference != "" && ValidMessageID(reference) && !daemon.store.HasArticle(reference) && !daemon.database.IsExpired(reference) {
@ -715,22 +739,17 @@ func (self *nntpConnection) handleLine(daemon *NNTPDaemon, code int, line string
code = 439
reason = err.Error()
}
conn.PrintfLine("%d %s %s", code, msgid, reason)
} else {
// error?
// discard, we do not want
code = 439
log.Println(self.name, "rejected", msgid, reason)
log.Println(self.name, "rejected", msgid, "unexpected error", err)
conn.PrintfLine("439 %s unexpected error", msgid)
_, err = io.Copy(ioutil.Discard, msg.Body)
if ban {
err = daemon.database.BanArticle(msgid, reason)
}
}
} else {
log.Println(self.name, "error reading mime header:", err)
code = 439
reason = "error reading mime header"
}
conn.PrintfLine("%d %s %s", code, msgid, reason)
} else if cmd == "ARTICLE" {
if !ValidMessageID(msgid) {
if len(self.group) > 0 {
@ -759,7 +778,7 @@ func (self *nntpConnection) handleLine(daemon *NNTPDaemon, code int, line string
}
} else if cmd == "IHAVE" {
if !self.authenticated {
conn.PrintfLine("483 You have not authenticated")
conn.PrintfLine("480 You have not authenticated")
} else {
// handle IHAVE command
msgid := parts[1]
@ -1656,7 +1675,6 @@ func (self *nntpConnection) runConnection(daemon *NNTPDaemon, inbound, stream, r
conn.PrintfLine("203 Stream it brah")
self.mode = "STREAM"
log.Println(self.name, "streaming enabled")
go self.startStreaming(daemon, reader, conn)
}
}
}