int send_packet(struct sr_instance* sr, char* iface, uint8_t* dstMAC, uint8_t* payload, unsigned int len, uint16_t type) {
assert(sr);
assert(payload);
assert(iface);
uint8_t* packet = (uint8_t*)malloc_or_die(len + 14);
struct sr_ethernet_hdr* tmpHdr = (struct sr_ethernet_hdr*) malloc_or_die(14* sizeof(uint8_t));
struct sr_vns_if* interface = sr_get_interface(sr, iface);
mac_copy(dstMAC, tmpHdr->ether_dhost);
mac_copy(interface->addr, tmpHdr->ether_shost);
tmpHdr->ether_type = htons(type);
memcpy(packet, tmpHdr, 14);
packet = packet + 14;
memcpy(packet, payload, len);
packet = packet - 14;
if((sr_integ_low_level_output(sr, packet, (unsigned int)(len + 14), iface)) == 0) {
printf("********** %s successfully sent a packet reply\n", __func__);
return 1;
}
else {
printf("\n @@@@@@@@@@@@@@@@@@@@ @@@@@@@@@@@@@@@@ %s sending packet failed?\n", __func__);
return 0;
}
return -1;
}
/* set up link-level communication from eth_mac_addr (my end) to
* client_mac_addr (his end). interface has already been opened,
* with raw socket "socket" and interface index if_index.
* if pio is non-null, use pipe-based communication in simulation environment.
*/
void com_util_init(int socket, int if_index, pio_t *pio,
mac_address_t eth_mac_addr, mac_address_t client_mac_addr)
{
if (pio != NULL) {
out_pio = pio;
have_out_pio = 1;
}
packet_socket = socket;
eth_if_index = if_index;
mac_copy(my_mac_addr, eth_mac_addr);
mac_copy(dest_mac_addr, client_mac_addr);
}
/* someone sent a cloud ping message to us. we send a ping response back. */
void process_ping_msg(message_t *message, int device_index)
{
mac_address_ptr_t sender;
message_t response;
memset(&response, 0, sizeof(response));
sender = get_name(device_index, message->eth_header.h_source);
if (db[7].d) {
ddprintf("got ping from ");
if (sender == NULL) {
ddprintf(" <NULL> (from get_name)\n");
} else {
mac_dprint(eprintf, stderr, sender);
}
}
if (sender != NULL) {
if (db[7].d) {
ddprintf("send response..\n");
}
response.message_type = ping_response_msg;
mac_copy(response.dest, sender);
send_cloud_message(&response);
} else {
ddprintf("process_ping_msg; get_name could not find mac address "
"of sender\n");
}
}
/* initialize internal mac_list of other boxes we see eth_beacons from,
* our internal LAN mac address, and our wireless mac address. (we send
* the latter out in the eth_beacons, because the wireless mac address is
* considered the "name" or identifier of each cloud box.)
*/
void eth_util_init(char *beacon_file, int socket, int if_index, pio_t *pio,
mac_address_t eth_mac_addr, mac_address_t box_wlan_mac_addr)
{
mac_list_init(&beacons, beacon_file,
mac_list_beacon_name, ETH_TIMEOUT_USEC, true);
if (pio != NULL) {
out_pio = pio;
use_pipe = 1;
}
packet_socket = socket;
eth_if_index = if_index;
mac_copy(my_mac_addr, eth_mac_addr);
mac_copy(name_mac_addr, box_wlan_mac_addr);
}
/* we've received a message from the other side. look at the protocol
* byte in the message and decide what to do with it based on that.
*
* if it's a shell command, write the command to our local interactive
* shell.
*
* if its part of the protocol to send or receive a file, do that.
*/
int com_util_process_message(unsigned char *buf)
{
message_t *message = (message_t *) buf;
mac_copy(dest_mac_addr,
*(mac_address_t *) message->eth_header.h_source);
if (db[6].d) {
fprintf(stderr, "processing message type %s; set dest_mac_addr to ",
com_util_message_string(message->msg_type));
mac_print(stderr, dest_mac_addr);
}
if (message->msg_type == shell_cmd_msg) {
if (-1 == write(new_stdin[1], message->msg_body,
message->msg_body_len))
{
perror("write to stdout of shell failed");
return -1;
}
} else if (message->msg_type == start_shell_msg) {
byte recv_buf[8];
int int_buf;
seq = 1;
int_buf = htonl(message->msg_body_len - 4);
memcpy(&recv_buf[0], (char *) &int_buf, 4);
int_buf = htonl(seq);
memcpy(&recv_buf[4], (char *) &int_buf, 4);
send_message(recv_buf, 8, recv_ok_msg);
} else if (message->msg_type == put_name_msg) {
start_receiving_file(message);
} else if (message->msg_type == transfer_cont_msg) {
continue_receiving_file(message);
} else if (message->msg_type == transfer_end_msg) {
end_receiving_file(message);
} else if (message->msg_type == get_name_msg) {
start_sending_file(message);
} else if (message->msg_type == recv_ok_msg
|| message->msg_type == recv_err_msg
|| message->msg_type == recv_err_stop_msg)
{
continue_sending_file(message);
}
return 0;
}
/* send an eth_beacon out our cat-5 internal LAN interface via using a
* link-level raw socket. the message contains this box's "name"
* (wireless interface mac address), and in the packet header it contains
* our LAN interface mac address and the eth_beacon protocol short int.
*/
static void send_beacon()
{
int result;
#if DEBUG0
printf("hi from send_beacon..\n");
#endif
mac_copy((mac_address_ptr_t) &buf[sizeof(struct ethhdr)], my_mac_addr);
mac_copy((mac_address_ptr_t) &buf[sizeof(struct ethhdr)
+ sizeof(mac_address_t)],
name_mac_addr);
ethhdr_p->h_proto = htons(0x2984);
mac_copy(ethhdr_p->h_dest, other_mac_addr);
mac_copy(ethhdr_p->h_source, my_mac_addr);
if (cooked_out_file == NULL) {
memset(&send_arg, 0, sizeof(send_arg));
send_arg.sll_family = AF_PACKET;
send_arg.sll_ifindex = eth_if_index;
send_arg.sll_halen = 6;
mac_copy(send_arg.sll_addr, other_mac_addr);
result = sendto(packet_socket, buf, sizeof(struct ethhdr) + 12, 0,
(struct sockaddr *) &send_arg, sizeof(send_arg));
} else {
result = pio_write(out_pio, buf, sizeof(struct ethhdr) + 12);
}
if (result == -1) {
fprintf(stderr, "sendto errno %d(%s)\n", errno, strerror(errno));
} else {
#if DEBUG0
printf("sendto result %d\n", result);
#endif
}
}
/* broadcast a ping message so that other cloud boxes can see that we are
* still alive. these messages are received via cloud protocol interface,
* so they are more reliable than 802.11 beacons.
* we just want to send them a little keep-alive message, and don't need
* a response. So we send ping_response_msg.
*/
void do_ping_neighbors()
{
message_t message;
memset(&message, 0, sizeof(message));
got_interrupt[ping_neighbors] = 0;
if (!db[46].d) { return; }
message.message_type = ping_response_msg;
mac_copy(message.dest, mac_address_bcast);
send_cloud_message(&message);
set_next_ping_alarm();
}
/* send a sequence number message. this is an addition to the protocol
* to attempt to improve message delivery robustness at the link level,
* at the expense of bandwidth.
*/
void send_seq(int stp_ind, byte *message, int msg_len)
{
message_t seq_msg;
if (!db[22].d) { return; }
if (db[23].d) {
ddprintf("send_seq sending <%d %d> to ",
stp_list[stp_ind].box.send_sequence,
msg_len);
mac_dprint(eprintf, stderr, stp_list[stp_ind].box.name);
}
#if 0
/* test-harness code; don't send a sequence message, to test the
* protocol when a sequence message gets dropped.
*/
if (db[24].d) {
ddprintf("send_seq intentionally dropping packet..\n");
db[24].d = false;
return;
}
#endif
seq_msg.message_type = sequence_msg;
seq_msg.v.seq.sequence_num = stp_list[stp_ind].box.send_sequence;
stp_list[stp_ind].box.awaiting_ack = true;
if (msg_len > CLOUD_BUF_LEN) {
seq_msg.v.seq.message_len = 0;
stp_list[stp_ind].box.message_len = 0;
ddprintf("send_seq got message with invalid length %d\n", msg_len);
} else {
seq_msg.v.seq.message_len = msg_len;
stp_list[stp_ind].box.message_len = msg_len;
memmove((void *) &stp_list[stp_ind].box.message, message, msg_len);
}
mac_copy(seq_msg.dest, stp_list[stp_ind].box.name);
send_cloud_message(&seq_msg);
update_ack_timer();
} /* send_seq */
/* if the status array does not have an entry with mac address mac, add
* one, with the given device type
*/
int status_add_by_mac(status_t *status, int *status_count, mac_address_t mac,
device_type_t type)
{
int result;
result = status_find_by_mac(status, *status_count, mac);
if (result != -1) { return result; }
if (*status_count >= MAX_CLOUD) { return -1; }
memset(&status[*status_count], 0, sizeof(status[*status_count]));
mac_copy(status[*status_count].name, mac);
status[*status_count].device_type = type;
(*status_count)++;
return *status_count - 1;
}
/* put mac into mac_list if it's not already there. */
static void add_mac_addr(mac_address_t mac)
{
int i;
for (i = 0; i < mac_count; i++) {
if (mac_equal(mac, mac_list[i])) {
ddprintf("add_mac_addr warning: duplicat mac addresses.\n");
// return;
}
}
if (mac_count >= MAX_CLOUD) {
ddprintf("add_mac_addr; too many mac addresses.\n");
return;
}
mac_copy(mac_list[mac_count++], mac);
}
/* debugging (non-protocol) routine to send a ping message to every
* neighbor box
*/
void send_nbr_pings()
{
int i;
message_t message;
memset(&message, 0, sizeof(message));
memset(&message, 0, sizeof(message));
message.message_type = ping_msg;
for (i = 0; i < nbr_device_list_count; i++) {
if (db[7].d) {
ddprintf("send ping to ");
mac_dprint(eprintf, stderr, nbr_device_list[i].name);
}
mac_copy(message.dest, nbr_device_list[i].name);
send_cloud_message(&message);
}
}
/* used to add wds or ad-hoc devices. uses cloud_box_t, which would cause
* circularities in .h files, so leave it here.
*/
void add_perm_io_stat_index(int *nbr_perm_io_stat_index,
mac_address_t neighbor_name, device_type_t type)
{
int i;
bool_t found;
status_t *p;
ddprintf("\n\n ADD_PERM_IO_STAT_INDEX \n\n");
found = false;
for (i = 0; i < perm_io_stat_count; i++) {
if (mac_equal(perm_io_stat[i].name, neighbor_name)) {
*nbr_perm_io_stat_index = i;
found = true;
break;
}
}
if (!found) {
if (perm_io_stat_count >= MAX_CLOUD) {
ddprintf("add_perm_io_stat_index; too many perm_io_stat's\n");
/* at some point, garbage collect perm_io_stat with oldest
* last-update time
*/
goto done;
}
p = &perm_io_stat[perm_io_stat_count++];
status_init(p);
mac_copy(p->name, neighbor_name);
p->device_type = type;
*nbr_perm_io_stat_index = perm_io_stat_count - 1;
}
done : ;
status_dprint_short_array(eprintf, stderr, perm_io_stat, perm_io_stat_count);
ddprintf("perm_io_stat_count: %d\n", perm_io_stat_count);
} /* add_perm_io_stat_index */
void pb_push_packet(mac_addr dhost_ether, dessert_msg_t* msg, struct timeval* timestamp) {
pb_cleanup(timestamp);
pb_el_t* pb_el;
HASH_FIND(hh, pbt.entries, dhost_ether, ETH_ALEN, pb_el);
if(pb_el == NULL) {
pb_el = malloc(sizeof(pb_el_t));
if(pb_el == NULL) {
dessert_msg_destroy(msg);
return;
}
mac_copy(pb_el->dhost_ether, dhost_ether);
pb_el->fl.head = pb_el->fl.tail = NULL;
pb_el->fl.size = 0;
HASH_ADD_KEYPTR(hh, pbt.entries, pb_el->dhost_ether, ETH_ALEN, pb_el);
}
fl_push_packet(&pb_el->fl, msg);
timeslot_addobject(pbt.ts, timestamp, pb_el);
}
/* for interface "device_name" (i.e., eth0 etc.), open a raw socket to
* the interface and get a file descriptor for the socket. add the
* interface (file descriptor and all) to device_list[].
*
* as a special case, if the device type is an ad-hoc, that means this
* is a description of another cloud box that we are communicating with
* in ad-hoc mode. in that case, find and copy the device_list[] entry
* for our wireless lan interface.
*/
void add_device(char *device_name, mac_address_t mac_address,
device_type_t device_type)
{
device_t *device;
static struct ifreq get_index;
int result;
struct sockaddr_ll bind_arg;
mac_address_t mac_addr;
int i;
device_t *wlan;
if (device_list_count >= MAX_CLOUD) {
ddprintf("add_device: too many devices.\n");
goto finish;
}
device = &device_list[device_list_count];
device->sim_device = 0;
device->expect_k = 0;
device->expect_n = -1;
// if (db[0].d) {
ddprintf("hi from add_device(%s)..\n", device_name);
// }
if (strstr(device_name, "wds") != NULL && device_type == device_type_wds) {
device->device_type = device_type_wds;
} else if (strstr(device_name, "wds") != NULL
&& device_type == device_type_cloud_wds)
{
device->device_type = device_type_cloud_wds;
} else if (strcmp(device_name, wlan_device_name) == 0
&& device_type == device_type_wlan)
{
device->device_type = device_type_wlan;
} else if (eth_device_name != NULL
&& strcmp(device_name, eth_device_name) == 0)
{
device->device_type = device_type_eth;
} else if (have_mon_device &&
strcmp(device_name, wlan_mon_device_name) == 0)
{
device->device_type = device_type_wlan_mon;
} else if (ad_hoc_mode && device_type == device_type_ad_hoc) {
bool_t found = false;
device->device_type = device_type_ad_hoc;
for (i = 0; i < device_list_count; i++) {
if (device_list[i].device_type == device_type_wlan) {
found = true;
wlan = &device_list[i];
break;
}
}
if (!found) {
ddprintf("add_device; couldn't find wireless device in ad_hoc mode");
goto finish;
}
} else if (/*ad_hoc_mode &&*/ device_type == device_type_cloud_wlan) {
device->device_type = device_type_cloud_wlan;
} else if (/*ad_hoc_mode &&*/ device_type == device_type_cloud_eth) {
device->device_type = device_type_cloud_eth;
} else {
ddprintf("add_device; unknown device_type '%s'\n", device_name);
goto finish;
}
if (mac_address == 0) {
result = mac_get(mac_addr, device_name);
if (result != 0) {
ddprintf("add_device: mac_get on %s failed.\n",
device_name);
goto finish;
}
} else {
mac_copy(mac_addr, mac_address);
}
if (ad_hoc_mode && device_type == device_type_ad_hoc) {
sprintf(device->device_name, wlan_device_name);
} else {
sprintf(device->device_name, device_name);
}
mac_copy(device->mac_address, mac_addr);
if (use_pipes) {
char fname[PATH_MAX];
int fd;
sprintf(fname, "%s/%s.cloud", pipe_directory, device_name);
fd = repeat_open(fname, O_RDWR);
ddprintf("opening wlan input device %s; fd %d\n", fname, fd);
if (fd == -1) {
ddprintf("add_device; could not open pipe %s: %s\n",
fname, strerror(errno));
goto finish;
}
device->fd = fd;
pio_init_from_fd(&device->in_pio, fname, fd);
ddprintf("done..\n");
sprintf(fname, "%s/%s.cooked", pipe_directory, device_name);
fd = repeat_open(fname, O_RDWR);
ddprintf("opening wlan output device %s; fd %d\n", fname, fd);
if (fd == -1) {
ddprintf("add_device; could not open pipe %s: %s\n",
fname, strerror(errno));
goto finish;
}
device->out_fd = fd;
pio_init_from_fd(&device->out_pio, fname, fd);
ddprintf("done..\n");
} else if (ad_hoc_mode && device_type == device_type_ad_hoc) {
device->fd = wlan->fd;
device->if_index = wlan->if_index;
} else {
device->fd = socket(PF_PACKET, SOCK_RAW, htons(ETH_P_ALL));
if (device->fd == -1) {
ddprintf("add_device: socket failed\n");
goto finish;
}
/* after a change of wep key, this fails. may need to delete and
* re-create wds interface?
*/
sprintf(get_index.ifr_name, device_name);
result = ioctl(device->fd, SIOCGIFINDEX, &get_index);
if (result == -1) {
ddprintf("add_device: could not get device index\n");
goto finish;
}
device->if_index = get_index.ifr_ifindex;
memset(&bind_arg, 0, sizeof(bind_arg));
bind_arg.sll_family = AF_PACKET;
bind_arg.sll_ifindex = get_index.ifr_ifindex;
if (device_type == device_type_cloud_wlan
|| device_type == device_type_cloud_eth
|| device_type == device_type_cloud_wds)
{
bind_arg.sll_protocol = htons(CLOUD_MSG);
} else if (db[47].d
&& ((ad_hoc_mode && !db[50].d && device_type == device_type_wlan)
|| device_type == device_type_wds))
{
bind_arg.sll_protocol = htons(WRAPPED_CLIENT_MSG);
} else {
bind_arg.sll_protocol = htons(ETH_P_ALL);
}
result = bind(device->fd, (struct sockaddr *) &bind_arg,
sizeof(bind_arg));
if (result == -1) {
ddprintf("add_device: bind failed\n");
goto finish;
}
}
if (db[50].d && device_type == device_type_ad_hoc) {
ad_hoc_client_add(device->mac_address);
}
add_io_stat(device);
device_list_count++;
finish :
// if (db[0].d) {
ddprintf("this device:\n");
print_device(eprintf, stderr, &device_list[device_list_count - 1]);
ddprintf("all devices:\n");
print_devices();
// }
} /* add_device */
/* just got a message from raw device d. if d is not a wds device, the
* message is ok. (for now we are just doing flow control over wds
* connections.) if it is a wds device, find the corresponding stp link
* and return true iff we have gotten a sequence packet and are expecting
* a message.
*/
bool_t message_ok(int d, int message_len)
{
int i;
if (!db[22].d) { return true; }
if (db[23].d) { ddprintf("message_ok;\n"); }
if (device_list[d].device_type != device_type_wds) {
if (db[23].d) { ddprintf(" not wds; returning true\n"); }
return true;
}
for (i = 0; i < stp_list_count; i++) {
if (stp_list[i].box.has_eth_mac_addr
|| !mac_equal(stp_list[i].box.name, device_list[d].mac_address))
{
continue;
}
if (stp_list[i].box.expect_seq) {
if (db[23].d) { ddprintf(" !expect_seq; "
"returning false\n"); }
stp_list[i].box.recv_error++;
return false;
}
if (stp_list[i].box.recv_message_len != message_len) {
if (db[23].d) { ddprintf(" bad message_len; "
"returning false\n"); }
stp_list[i].box.recv_error++;
return false;
}
{
message_t response;
memset(&response, 0, sizeof(response));
response.message_type = ack_sequence_msg;
response.v.seq.sequence_num = stp_list[i].box.recv_sequence;
response.v.seq.message_len = stp_list[i].box.recv_message_len;
if (db[23].d) {
ddprintf(" sending ack_sequence_msg <%d %d>\n",
stp_list[i].box.recv_sequence,
stp_list[i].box.recv_message_len);
}
mac_copy(response.dest, stp_list[i].box.name);
if (db[24].d) {
ddprintf(" not sending ack message..\n");
db[24].d = false;
} else {
send_cloud_message(&response);
}
stp_list[i].box.expect_seq = true;
if (!stp_list[i].box.received_duplicate) {
stp_list[i].box.recv_sequence++;
} else {
stp_list[i].box.received_duplicate = false;
if (db[23].d) { ddprintf(" received_duplicate; "
"returning false\n"); }
return false;
}
}
if (db[23].d) { ddprintf(" found it; returning true\n"); }
return true;
}
if (db[23].d) { ddprintf(" didn't find it; returning false\n"); }
return false;
}
/* add children of new_stp_list[ind]. we do this by looking at
* the status array of new_stp_list[ind]. for each of those, we see
* if we have a valid back pointer, based on my_beacon, beacon if we have
* a new one, or cloud_stp_list. for valid dest nodes we find, see which
* ones are not yet in new_stp_list, and add those as children. the
* new_stp_list entries we copy will be beacon if we have it and the
* dest matches beacon's originator field, or from cloud_stp_list, our
* old version of this data structure that contains most recent beacons
* from all nodes we were connected to the last time this set of routines
* was run.
*/
static void add_children(int ind)
{
int i, j;
int prev_new_stp_list_count, next_new_stp_list_count;
stp_beacon_t *node = &new_stp_list[ind].v.stp_beacon;
char buf[20];
if (db[32].d) { ddprintf("add_children..\n"); }
prev_new_stp_list_count = new_stp_list_count;
new_stp_child_start[ind] = new_stp_list_count;
new_stp_child_count[ind] = 0;
mac_sprintf(new_node_names[ind], node->originator);
if (db[32].d) {
ddprintf("added new_node_names[%d]: %s\n", ind,
mac_sprintf(buf, node->originator));
}
for (i = 0; i < node->status_count; i++) {
status_t *s = &node->status[i];
message_t *new_node = NULL;
if (s->device_type != device_type_wds) { continue; }
if (s->neighbor_type != STATUS_CLOUD_NBR) { continue; }
if (in_mac_list(new_stp_list, new_stp_list_count, s->name)) {
continue;
}
if (!has_valid_back_pointer(node->originator, s->name)) {
continue;
}
if (have_beacon
&& mac_equal(s->name, beacon.v.stp_beacon.originator))
{
new_node = &beacon;
} else {
for (j = 0; j < cloud_stp_list_count; j++) {
if (mac_equal(s->name,
cloud_stp_list[j].v.stp_beacon.originator))
{
new_node = &cloud_stp_list[j];
break;
}
}
}
if (new_node == NULL || new_stp_list_count >= MAX_CLOUD) { break; }
new_stp_list[new_stp_list_count] = *new_node;
new_stp_child_count[new_stp_list_count] = 0;
new_stp_list_count++;
new_stp_child_count[ind]++;
if (db[32].d) {
ddprintf("add ");
mac_dprint(eprintf, stderr,
new_stp_list[new_stp_list_count - 1]
.v.stp_beacon.originator);
}
}
next_new_stp_list_count = new_stp_list_count;
/* add any ad-hoc clients that this box serves */
for (i = 0; i < node->status_count; i++) {
status_t *s = &node->status[i];
char buf[20];
if (s->neighbor_type != STATUS_NON_CLOUD_CLIENT) { continue; }
if (in_mac_list(new_stp_list, new_stp_list_count, s->name))
{ continue; }
if (new_stp_list_count >= MAX_CLOUD) { break; }
new_stp_child_count[ind]++;
/* not really necessary since we now init new_node_names[i] here */
mac_copy(new_stp_list[new_stp_list_count].v.stp_beacon.originator,
s->name);
new_stp_child_count[new_stp_list_count] = 0;
sprintf(new_node_names[new_stp_list_count], "(%s)",
mac_sprintf(buf, s->name));
new_stp_list_count++;
}
for (i = prev_new_stp_list_count; i < next_new_stp_list_count; i++) {
add_children(i);
}
if (db[32].d) {
ddprintf("done add_children(%d)..\n", ind);
dprint_db_cloud_stats(eprintf, stderr, new_stp_list,
new_stp_child_start, new_stp_child_count,
new_stp_list_count);
}
}
/* expire any stale mac addresses from the mac_list.
* add mac_address to the list, or if it's already there refresh its
* time to "now".
*
* include name, signal_strength, and desc in the record for this mac address.
*/
void mac_list_add(mac_list_t *mac_list, mac_address_t mac_addr,
mac_address_t name, int signal_strength, char *desc, bool_t write_um)
{
int i, this_beacon;
struct timeval tv;
struct timezone tz;
if (gettimeofday(&tv, &tz)) {
fprintf(stderr, "mac_list_add; gettimeofday failed\n");
return;
}
if (mac_list_expire_timed_macs(mac_list)) {
fprintf(stderr, "mac_list_add; mac_list_expire_timed_macs failed\n");
return;
}
this_beacon = -1;
for (i = 0; i < mac_list->next_beacon; i++) {
if (mac_equal(mac_addr, mac_list->beacons[i].mac_addr)) {
this_beacon = i;
break;
}
}
if (this_beacon == -1) {
if (mac_list->next_beacon == MAX_CLOUD) {
fprintf(stderr, "mac_list_add; too many mac addresses\n");
return;
}
mac_copy(mac_list->beacons[mac_list->next_beacon].mac_addr, mac_addr);
this_beacon = mac_list->next_beacon;
mac_list->next_beacon++;
}
mac_copy(mac_list->names[this_beacon], name);
if (desc != NULL) {
strncpy(mac_list->desc[this_beacon], desc, MAX_DESC);
}
if (signal_strength != NO_SIGNAL_STRENGTH) {
mac_list->signal_strength[this_beacon] = signal_strength;
}
mac_list->beacons[this_beacon].tv_sec = tv.tv_sec;
mac_list->beacons[this_beacon].tv_usec = tv.tv_usec;
#ifdef DEBUG
if (debug_file_inited) {
fprintf(debug_file, "%s; time update ", mac_list->fname);
mac_print_no_eoln(debug_file,
mac_list->beacons[this_beacon].mac_addr);
fprintf(debug_file, " at ");
util_print_time(debug_file, &tv);
fprintf(debug_file, "\n");
fflush(debug_file);
}
#endif
if (write_um) {
if (mac_list_write(mac_list)) {
fprintf(stderr, "mac_list_add; write_beacons failed\n");
}
}
}
/* read the mac_list in from its associated file.
* return 0 on success, -1 on failure.
* read up to a maximum of MAX_CLOUD mac addresses,
* and read the extra info associated with each mac address, based on
* the type of the mac_list.
* initialize the mac address times to "now".
*/
int mac_list_read(mac_list_t *mac_list)
{
int result = 0;
struct timeval tv;
struct timezone tz;
FILE *f;
if (gettimeofday(&tv, &tz)) {
fprintf(stderr, "mac_list_read; gettimeofday failed\n");
return -1;
}
f = fopen(mac_list->fname, "r");
if (f == NULL) {
perror("mac_list_read fopen failed");
fprintf(stderr, " could not open %s\n", mac_list->fname);
result = -1;
goto done;
}
mac_list->next_beacon = 0;
while (1) {
mac_address_t mac_addr;
if (1 != mac_read(f, mac_addr)) {
break;
}
if (mac_list->next_beacon >= MAX_CLOUD) {
fprintf(stderr, "mac_list_read: too many entries in file\n");
result = -1;
goto done;
}
mac_copy(mac_list->beacons[mac_list->next_beacon].mac_addr, mac_addr);
mac_list->beacons[mac_list->next_beacon].tv_sec = tv.tv_sec;
mac_list->beacons[mac_list->next_beacon].tv_usec = tv.tv_usec;
/* check scanf results etc. to bullet-proof */
switch (mac_list->type) {
case mac_list_beacon_desc :
fscanf(f, "%s", mac_list->desc[mac_list->next_beacon]);
break;
case mac_list_beacon_name :
mac_read(f, mac_list->names[mac_list->next_beacon]);
break;
case mac_list_beacon_signal_strength :
fscanf(f, " %d\n",
&mac_list->signal_strength[mac_list->next_beacon]);
break;
case mac_list_beacon :
break;
default :
fprintf(stderr, "mac_list_read: invalid type %d\n",
mac_list->type);
break;
}
mac_list->next_beacon++;
}
done:
if (f != NULL) { fclose(f); }
return result;
}
/* send buf to the other side. if we are using a link-level raw socket,
* set up the "sendto" arguments to shove
* the bits through the raw socket interface.
* if an IP connection, do the "write()".
* if a pipe, send the bytes through the pipe.
*
* if the buffer is too
* long to fit in one sendto message, break the
* buffer up into multiple chunks and send them separately.
*/
static void send_message(unsigned char *buf, int buflen, msg_type_t msg_type)
{
int result;
message_t msg;
if (db[1].d) {
printf("hi from send_message.. sending %d bytes\n", buflen);
}
if (cooked_out_file == NULL) {
memset(&send_arg, 0, sizeof(send_arg));
send_arg.sll_family = AF_PACKET;
send_arg.sll_ifindex = eth_if_index;
send_arg.sll_halen = 6;
mac_copy(send_arg.sll_addr, dest_mac_addr);
}
msg.eth_header.h_proto = htons(0x2985);
mac_copy(msg.eth_header.h_dest, dest_mac_addr);
mac_copy(msg.eth_header.h_source, my_mac_addr);
while (buflen > 0) {
int next_gulp;
if (buflen > BUF_LEN) {
next_gulp = BUF_LEN;
} else {
next_gulp = buflen;
}
memcpy((void *) msg.msg_body, buf, next_gulp);
msg.msg_body_len = next_gulp;
msg.msg_type = msg_type;
buf += next_gulp;
buflen -= next_gulp;
if (db[1].d) {
fprintf(stderr, "sending %ld bytes..\n",
(unsigned long) &(msg.msg_body[next_gulp])
- (unsigned long) &msg);
}
if (cooked_out_file == NULL) {
result = sendto(packet_socket, (void *) &msg,
(char *) &(msg.msg_body[next_gulp]) - (char *) &msg, 0,
(struct sockaddr *) &send_arg, sizeof(send_arg));
} else if (have_out_pio) {
result = pio_write(out_pio, (void *) &msg,
(char *) &(msg.msg_body[next_gulp]) - (char *) &msg);
} else {
result = write(out_fd, (void *) &msg,
(char *) &(msg.msg_body[next_gulp]) - (char *) &msg);
}
if (result == -1) {
com_errors++;
if (db[5].d) {
fprintf(stderr, "sendto/write errno %d (%s)\n", errno,
strerror(errno));
}
} else {
#if DEBUG0
printf("sendto result %d\n", result);
#endif
}
}
}
