On Mon, 12 Jun 2000, Philip Hazel wrote:
> This can't be done (yet) for IPv6 as I understand it. That is why the
> Exim notes for IPv6 suggest that you set local_interfaces to tell Exim
Linux currently won't return IPv6 for SIOCGIFCONF presumably because glibc
still has 'struct sockaddr' not 'struct sockaddr_storage' so it cannot
hold the larger addresess.
You'll have to use netlink or /proc/net/if_inet6 - I might make a patch
for that.
However, here is a patch that you can apply to fix interface discovery and
multiple IPs. Using the new-style aliasing in Linux you can have multiple
IPs per interface. Exim does a SIOCFIGADDR which breaks that, this patch
simply makes that configurable and disables it for Linux..
Example of situation:
white{jgg}/tmp#ip addr
1: lo: <LOOPBACK,UP> mtu 3924 qdisc noqueue
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
2: eth0: <BROADCAST,MULTICAST,UP> mtu 1500 qdisc pfifo_fast qlen 100
link/ether 00:50:da:79:a4:2a brd ff:ff:ff:ff:ff:ff
inet 172.16.1.1/24 scope global eth0
inet 216.221.195.75/29 scope global eth0
Old exim:
white{jgg}/tmp#exim -d10 -bt jgg@foorbar
Exim version 3.12 debug level 10 uid=103 gid=100
probably Berkeley DB version 1.8x (native mode)
white.priv.deltatee.com in local_domains? no (end of list)
Actual local interface address is 127.0.0.1
Actual local interface address is 172.16.1.1
Actual local interface address is 172.16.1.1
Fixed exim:
white{jgg}/tmp/exim-3.12.jgg#build-Linux-i386/exim -d10 -bt jgg@foorbar
Exim version 3.12 debug level 10 uid=103 gid=100
probably Berkeley DB version 1.8x (native mode)
white.priv.deltatee.com in local_domains? no (end of list)
Actual local interface address is 127.0.0.1
Actual local interface address is 172.16.1.1
Actual local interface address is 216.221.195.75
Jason
--- /tmp/exim-3.12/src/host.c Mon Aug 7 21:07:12 2000
+++ /tmp/exim-3.12.jgg/src/host.c Mon Aug 7 21:21:05 2000
@@ -433,11 +433,16 @@
if ((ifreq.ifr_flags & IFF_UP) == 0) continue;
/* Get the IP address of the interface */
-
+#ifndef SIOCGIFCONF_GIVES_ADDR
if (ioctl(vs, SIOCGIFADDR, (char *)&ifreq) < 0)
log_write(0, LOG_PANIC_DIE, "Unable to get interface address: %d %s",
errno, strerror(errno));
-
+#else
+ /* On OS's where SIOCGIFCONF gives the address we do not want to
+ use SIOCGIFADDR, it may be bad in the case of ip aliasing */
+ ifreq = *ifr;
+#endif
+
/* Create a data block for the address, fill in the data, and put it on the
chain. This data has to survive for ever, so use malloc. */
--- /tmp/exim-3.12/OS/os.h-Linux Wed Dec 8 02:57:03 1999
+++ /tmp/exim-3.12.jgg/OS/os.h-Linux Mon Aug 7 21:19:42 2000
@@ -5,6 +5,7 @@
#define HAVE_SYS_VFS_H
#define NO_IP_VAR_H
#define GLIBC_IP_OPTIONS
+#define SIOCGIFCONF_GIVES_ADDR
#define F_FREESP O_TRUNC
typedef struct flock flock_t;
