nightmaremail

commit 763638654f6d62ebb129f1b60a2fbf9d409590f4
parent 796dbc19914bd6039cca7b6e19c9d38a8eb3a10f
Author: Leah Neukirchen <leah@vuxu.org>
Date:   Fri,  1 May 2020 13:23:08 +0200

dns: remove dns_cname, unused.

Diffstat:
M
FAQ.md
 | 
11
-----------
M
dns.c
 | 
31
-------------------------------
M
dns.h
 | 
1
-

3 files changed, 0 insertions(+), 43 deletions(-)
diff --git a/FAQ.md b/FAQ.md
@@ -11,7 +11,6 @@ document, and <http://qmail.org/> for qmail community contributions.
 2.2. How do I set up a null client?  
 2.3. How do I send outgoing mail through UUCP?  
 2.4. How do I set up a separate queue for a SLIP/PPP link?  
-2.5. How do I deal with "CNAME lookup failed temporarily"?  
 
 3. Routing incoming messages by host  
 3.1. How do I receive mail for another host name?  
@@ -136,16 +135,6 @@ running, give it a HUP.
 Answer: Use serialmail (<https://cr.yp.to/serialmail.html>).
 
 
-2.5. How do I deal with "CNAME lookup failed temporarily"? The log
-showed that a message was deferred for this reason. Why is qmail doing
-CNAME lookups, anyway?
-
-Answer: The SMTP standard does not permit aliased hostnames, so qmail
-has to do a CNAME lookup in DNS for every recipient host. If the
-relevant DNS server is down, qmail defers the message. It will try again
-soon.
-
-
 
 3. Routing incoming messages by host
 
diff --git a/dns.c b/dns.c
@@ -187,37 +187,6 @@ int flagsearch;
  if (flagsearch) lookup = res_search;
 }
 
-int dns_cname(sa)
-stralloc *sa;
-{
- int r;
- int loop;
- for (loop = 0;loop < 10;++loop)
-  {
-   if (!sa->len) return loop;
-   if (sa->s[sa->len - 1] == ']') return loop;
-   if (sa->s[sa->len - 1] == '.') { --sa->len; continue; }
-   switch(resolve(sa,T_CNAME))
-    {
-     case DNS_MEM: return DNS_MEM;
-     case DNS_SOFT: return DNS_SOFT;
-     case DNS_HARD: return loop;
-     default:
-       while ((r = findname(T_CNAME)) != 2)
-	{
-	 if (r == DNS_SOFT) return DNS_SOFT;
-	 if (r == 1)
-	  {
-	   if (!stralloc_copys(sa,name)) return DNS_MEM;
-	   break;
-	  }
-	}
-       if (r == 2) return loop;
-    }
-  }
- return DNS_HARD; /* alias loop */
-}
-
 #define FMT_IAA 40
 
 static int iaafmt(char *s, struct ip_address *ipa)
diff --git a/dns.h b/dns.h
@@ -6,7 +6,6 @@
 #define DNS_MEM -3
 
 void dns_init();
-int dns_cname();
 int dns_mxip();
 int dns_ip();
 int dns_ptr();