Bug 859052 - Sendmail doesn't support dual-stack IPv4/IPv6 with static addresses: "too many daemons defined"
Sendmail doesn't support dual-stack IPv4/IPv6 with static addresses: "too man...
Product: Fedora
Classification: Fedora
Component: sendmail (Show other bugs)
Unspecified Unspecified
unspecified Severity high
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Assigned To: Jaroslav Škarvada
Fedora Extras Quality Assurance
Depends On:
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Reported: 2012-09-20 09:10 EDT by tlhackque
Modified: 2013-07-31 21:53 EDT (History)
3 users (show)

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Doc Type: Bug Fix
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Last Closed: 2013-07-31 21:53:52 EDT
Type: Bug
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RHEL 7.3 requirements from Atomic Host:
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Description tlhackque 2012-09-20 09:10:41 EDT
Description of problem:

Sendmail refuses to start when a server with both static IPv4 and IPv6 addresses is configured with an MSA, MTA & TLS.

Version-Release number of selected component (if applicable):

sendmail.x86_64                         8.14.5-14.fc17               @updates

How reproducible:

Configure sendmail as follows (substitute your own addresses for the doc addresses used below!):

DAEMON_OPTIONS(`Port=smtp,Addr=, Name=MTA')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=, Name=MTA4')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=::1, Family=inet6, Name=MTA6')dnl
DAEMON_OPTIONS(`Port=smtp,Addr=2001:2001:DB8::19, Family=inet6, Name=MTA6')dnl
DAEMON_OPTIONS(`Port=submission, Name=MSA, M=Ea')dnl
DAEMON_OPTIONS(`Port=submission,Addr=, Name=MSA4, M=Ea')dnl
DAEMON_OPTIONS(`Port=submission,Addr=::1, Family=inet6, Name=MSA6, M=Ea')dnl
DAEMON_OPTIONS(`Port=submission,Addr=2001:DB8::19, Family=inet6, Name=MSA6, M=Ea')dnl

DAEMON_OPTIONS(`Port=smtps,Addr=, Name=TLSMTA, M=s')dnl
DAEMON_OPTIONS(`Port=smtps,Addr=, Name=TLSMTA4, M=s')dnl
DAEMON_OPTIONS(`Port=smtps,Addr=::1, Family=inet6, Name=TLSMTA6, M=s')dnl
DAEMON_OPTIONS(`Port=smtps,Addr=2001:DB8::19, Family=inet6, Name=TLSMTA6, M=s')dnl

Fails with:
sendmail[2985]: 554 5.0.0 /etc/mail/sendmail.cf: line 287: too many daemons defined (10 max)
sendmail[2985]: 554 5.0.0 /etc/mail/sendmail.cf: line 288: too many daemons defined (10 max)
sendmail[2985]: NOQUEUE: SYSERR(root): /etc/mail/sendmail.cf: line 287: too many dae... max)
sendmail[2985]: NOQUEUE: SYSERR(root): /etc/mail/sendmail.cf: line 288: too many dae... max)

The problem is that the (hardcoded constant) MAXDAEMONS in sendmail/conf.h is 10

But this (reasonable) configuration requires 12 daemons:  (MSA+MTA+TLS) * (LoopV4+LoopV6+WanV4+WanV6) = 3 * 4 = 12!

This parameter controls a few smallish tables.  Since one might imagine a site with more than one attached network, a value of 25 seems more reasonable.

The following patch accomplishes this.  I suggest also sending it upstream since IPV6 is (finally) gathering some momentum!

Additional info:

You won't notice this if you listen on the wildcard IP addresses as many people do, or if you only run 2 of the three daemon classes...

cat sendmail_maxDaemons.patch
--- sendmail/conf.h.orig        2012-09-20 08:27:18.000000000 -0400
+++ sendmail/conf.h     2012-09-20 08:28:00.000000000 -0400
@@ -110,11 +110,11 @@
 #define MAXMACROID     0377            /* max macro id number */
                                        /* Must match (BITMAPBITS - 1) */
 # define MAXHDRSLEN    (32 * 1024)     /* max size of message headers */
 #endif /* ! MAXHDRSLEN */
-#define MAXDAEMONS     10              /* max number of ports to listen to */
+#define MAXDAEMONS     25              /* max number of ports to listen to */
 # define MAXINTERFACES 512             /* number of interfaces to probe */
 #endif /* MAXINTERFACES */
 # define MAXSYMLINKS   32              /* max number of symlinks in a path */
Comment 1 Fedora End Of Life 2013-07-03 19:18:44 EDT
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Comment 2 Fedora End Of Life 2013-07-31 21:53:58 EDT
Fedora 17 changed to end-of-life (EOL) status on 2013-07-30. Fedora 17 is 
no longer maintained, which means that it will not receive any further 
security or bug fix updates. As a result we are closing this bug.

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