slirp: Add domainname option to slirp's DHCP server

This patch will allow the user to include the domainname option in
replies from the built-in DHCP server.

Signed-off-by: Benjamin Drung <benjamin.drung@profitbricks.com>
Signed-off-by: Samuel Thibault <samuel.thibault@ens-lyon.org>

1 files changed, 8 insertions, 0 deletions

diff --git a/slirp/bootp.c b/slirp/bootp.c
index 5dd1a415b5..9e7b53ba94 100644
--- a/slirp/bootp.c
+++ b/slirp/bootp.c
@@ -298,6 +298,14 @@ static void bootp_reply(Slirp *slirp, const struct bootp_t *bp)
             q += val;
         }
 
+        if (slirp->vdomainname) {
+            val = strlen(slirp->vdomainname);
+            *q++ = RFC1533_DOMAINNAME;
+            *q++ = val;
+            memcpy(q, slirp->vdomainname, val);
+            q += val;
+        }
+
         if (slirp->vdnssearch) {
             size_t spaceleft = sizeof(rbp->bp_vend) - (q - rbp->bp_vend);
             val = slirp->vdnssearch_len;