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author | Ed Swierk <eswierk@aristanetworks.com> | 2009-08-20 19:00:31 -0700 |
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committer | Anthony Liguori <aliguori@us.ibm.com> | 2009-08-27 20:46:58 -0500 |
commit | ce220b69ddd15c1981cd32346f745b609f7a525c (patch) | |
tree | 748ab96f13a066005d1af90db78568ece3716eb4 /socket.c | |
parent | 1c53d0d38dc187ba978f2748e8c4d7ab67bcc063 (diff) | |
download | slirp-ce220b69ddd15c1981cd32346f745b609f7a525c.zip slirp-ce220b69ddd15c1981cd32346f745b609f7a525c.tar.gz slirp-ce220b69ddd15c1981cd32346f745b609f7a525c.tar.bz2 |
slirp: Read host DNS config on demand
Currently the qemu user-mode networking stack reads the host DNS
configuration (/etc/resolv.conf or the Windows equivalent) only once
when qemu starts. This causes name lookups in the guest to fail if the
host is moved to a different network from which the original DNS servers
are unreachable, a common occurrence when the host is a laptop.
This patch changes the slirp code to read the host DNS configuration on
demand, caching the results for at most 1 second to avoid unnecessary
overhead if name lookups occur in rapid succession. On non-Windows
hosts, /etc/resolv.conf is re-read only if the file has been replaced or
if its size or mtime has changed.
Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
Diffstat (limited to 'socket.c')
-rw-r--r-- | socket.c | 3 |
1 files changed, 2 insertions, 1 deletions
@@ -557,7 +557,8 @@ int sosendto(struct socket *so, struct mbuf *m) slirp->vnetwork_addr.s_addr) { /* It's an alias */ if (so->so_faddr.s_addr == slirp->vnameserver_addr.s_addr) { - addr.sin_addr = dns_addr; + if (get_dns_addr(&addr.sin_addr) < 0) + addr.sin_addr = loopback_addr; } else { addr.sin_addr = loopback_addr; } |