On May 28, 2005, at 11:08 PM, Timothy A. Napthali wrote:
I've run into an interesting problem with the spamd SMTP banner.
I have a few OpenBSD 3.7 mail gateways running Postfix that are members
(from a DNS perspective) of an internal DNS domain such as
mail.company.org. They are MX destinations for mail for company.com,
and
postfix reports to external SMTP servers as mail.company.com (the
servers are NAT translated).
The issue I have is that spamd uses gethostname to build the SMTP
banner
so the name shown in the banner is of course mail.company.org and not
mail.company.com. Postfix of course reports as mail.company.com.
Looking at the source was easy enough to hardcode it. Patch further
below, first the test...
# tail -5 /etc/spamd.conf
myblack:\
:black:\
:msg="SPAM TEST":\
:method=file:\
:file=/var/mail/myblack.txt:
# echo 127.0.0.1 > /var/mail/myblack.txt
# pwd
/usr/src/libexec/spamd
# ../../../obj/libexec/spamd/spamd
# telnet localhost 8025
Trying ::1...
telnet: connect to address ::1: Connection refused
Trying 127.0.0.1...
Connected to localhost.
Escape character is '^]'.
220 mail.company.com ESMTP spamd IP-based S^C^C^C^C^C
And the patch...
# diff -u spamd.c.old spamd.c
--- spamd.c.old Tue May 24 06:07:17 2005
+++ spamd.c Sat May 28 21:04:08 2005
@@ -99,7 +99,7 @@
void handler(struct con *);
void handlew(struct con *, int one);
-char hostname[MAXHOSTNAMELEN];
+char *hostname = "mail.company.com";
struct syslog_data sdata = SYSLOG_DATA_INIT;
char *reply = NULL;
char *nreply = "450";
@@ -954,9 +954,6 @@
if ((ent = getservbyname("spamd-cfg", "tcp")) == NULL)
errx(1, "Can't find service \"spamd-cfg\" in
/etc/services");
cfg_port = ntohs(ent->s_port);
-
- if (gethostname(hostname, sizeof hostname) == -1)
- err(1, "gethostname");
while ((ch = getopt(argc, argv, "45b:c:B:p:dgG:r:s:S:n:vw:"))
!= -1) {
switch (ch) {
--
Jason Dixon
DixonGroup Consulting
http://www.dixongroup.net
