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Diffstat (limited to 'ffvisd')
-rw-r--r--ffvisd/ffvisd.c5
1 files changed, 4 insertions, 1 deletions
diff --git a/ffvisd/ffvisd.c b/ffvisd/ffvisd.c
index d1b36f0..93e9b1b 100644
--- a/ffvisd/ffvisd.c
+++ b/ffvisd/ffvisd.c
@@ -462,7 +462,8 @@ static void send_announcement(const char *ifname, unsigned ifindex, void *arg) {
sa.sll_halen = ETH_ALEN;
memcpy(sa.sll_addr, ffd_addr.address, ETH_ALEN);
- sendto(sockfd, packet, sizeof(ffvisd_packet_announce_t) + ntohs(packet->n_servers)*sizeof(ffvisd_packet_server_announce_t), 0, (struct sockaddr*)&sa, sizeof(sa));
+ unsigned len = sizeof(ffvisd_packet_announce_t) + ntohs(packet->n_servers)*sizeof(ffvisd_packet_server_announce_t);
+ sendto(sockfd, packet, len > 46 ? len : 46, 0, (struct sockaddr*)&sa, sizeof(sa));
}
free(if_mesh);
}
@@ -470,6 +471,8 @@ static void send_announcement(const char *ifname, unsigned ifindex, void *arg) {
static void send_announcements() {
ffvisd_packet_announce_t *packet = alloca(sizeof(ffvisd_packet_announce_t) + 75*sizeof(ffvisd_packet_server_announce_t));
+ memset(packet, 0, 46); /* minimum ethernet packet size is 46 bytes */
+
packet->magic = htons(FFD_MAGIC);
packet->version = htons(FFVISD_VERSION);
packet->csum = 0;