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Fix minimum packet size

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This commit is contained in:
Matthias Schiffer 2012-08-30 01:27:34 +02:00
parent 044be347c8
commit de3da7a6e4
1 changed files with 4 additions and 1 deletions
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5
ffvisd/ffvisd.c
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@ -462,7 +462,8 @@ static void send_announcement(const char *ifname, unsigned ifindex, void *arg) {
sa.sll_halen = ETH_ALEN; sa.sll_halen = ETH_ALEN;
memcpy(sa.sll_addr, ffd_addr.address, 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); free(if_mesh);
} }
@ -470,6 +471,8 @@ static void send_announcement(const char *ifname, unsigned ifindex, void *arg) {
static void send_announcements() { static void send_announcements() {
ffvisd_packet_announce_t *packet = alloca(sizeof(ffvisd_packet_announce_t) + 75*sizeof(ffvisd_packet_server_announce_t)); 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->magic = htons(FFD_MAGIC);
packet->version = htons(FFVISD_VERSION); packet->version = htons(FFVISD_VERSION);
packet->csum = 0; packet->csum = 0;