Merge branch '11-envoie-des-paquets' into 14-implement-poll

src/hash.h

@@ -2,20 +2,22 @@
 #define HASH_H
 
 #include <openssl/sha.h>
-#include "node.h"
+
 #include "tlv.h"
+#include "parser.h"
+#include "node.h"
 
 // Hash a single data
-void hash_data(pub_data *data, unsigned char *buf);
+void hash_data(struct pub_data *data, unsigned char *buf);
 
 // Hash every data contained in data_list then return a network hash
-void hash_network(list *data_list, unsigned char *buf);
+void hash_network(struct list *data_list, unsigned char *buf);
 
 // Truncate 32 octet hash to 16 octets
 void hash_trunc(unsigned char *hash256bit, unsigned char *buf);
 
 // Concat all fields of data and put them in buf
-void concat_data(pub_data *data, unsigned char *buf);
+void concat_data(struct pub_data *data, unsigned char *buf);
 
 // Concat hash2 to hash1 (hash1 is modified)
 void concat_hash(unsigned char *hash1, unsigned char *hash2, size_t size);

src/node.c

@@ -8,8 +8,11 @@
 #include <string.h>
 #include <time.h>
 
-#include "tlv.h"
 #include "node.h"
+#include "tlv.h"
+#include "hash.h"
+#include "parser.h"
+
 
 /* ----  Fonctions utilitaires  ---- */
 
@@ -43,8 +46,182 @@ neighbour_peer *get_random_neighbour() {
     return (neighbour_peer*) tmp->data;
 }
 
+// get data associated with id, if it doesn't exist return NULL
+pub_data *get_data(long id) {
+	list *tmp = data_list;
+	pub_data *data;
+
+	while(tmp != NULL) {
+		data = (pub_data*) tmp->data;
+
+		if(data->id == id)
+			return data;
+	}
+
+	return NULL;
+}
+
+// Take data as args and create a pub_data structure in the heap
+pub_data *copy_data(unsigned char len, long id, short seqno, char *data) {
+	pub_data *new_data = (pub_data*) malloc(sizeof(pub_data));
+	char *_data = (char*) malloc(len);
+	new_data->length = len;
+	new_data->id = id;
+	new_data->seqno = seqno;
+	new_data->data = _data;
+	memcpy(_data, data, len);
+
+	return new_data;
+}
+
+// Add new data to data list
+void add_data(unsigned char len, long id, short seqno, char *data) {
+	// If id is the same as this node's id then we only update seqno
+	if(id == NODE_ID) {
+		pub_data *node_data = get_data(NODE_ID);
+
+		if(seqno >= node_data->seqno) {
+			node_data->seqno = seqno ^ 1;
+		}
+
+		return;
+	}
+
+	// Copy data
+	pub_data *new_data = copy_data(len, id, seqno, data);
+
+	if(data_list == NULL) {
+		// Update list
+		data_list = (list*) malloc(sizeof(list));
+		data_list->data = (void*) new_data;
+		data_list->next = NULL;
+
+		return;
+	}
+
+	// Find correct position for new data
+	list *tmp = data_list;
+	list *last = NULL;
+	list *new_node;
+	long cur_id;
+
+	while(tmp != NULL) {
+		cur_id = ((pub_data*) tmp->data)->id;
+
+		// If id is smaller than cur_id then the new data has to be added at this position
+		if(id < cur_id) {
+			// If last hasn't been set then the new data becomes the head of the list
+			if(last == NULL) {
+				// Update list
+				data_list = (list*) malloc(sizeof(list));
+				data_list->data = (void*) new_data;
+				data_list->next = tmp;
+
+				return;
+			}
+
+			// Else, we update the last node
+			new_node = (list*) malloc(sizeof(list));
+			new_node->data = (void*) new_data;
+			new_node->next = tmp;
+			last->next = new_node;
+
+			return;
+		} else if(id == cur_id) {
+			// If data already exists for this id then we update it if it's seqno is greater than the one stored
+			pub_data *cur_data = (pub_data*) tmp->data;
+
+			if(seqno > cur_data->seqno) {
+				// Updata data
+				tmp->data = (void*) new_data;
+
+				// Free old data
+				free(cur_data);
+
+				return;
+			}
+
+			// seqno is smaller so the new data allocated is freed and nothing else is done
+			free(new_data);
+
+			return;
+		}
+
+		// Get next node in list
+		last = tmp;
+		tmp = tmp->next;
+	}
+
+	// If no correct position was found then the new data has to be added at the end of the list
+
+	// Update list
+	new_node = (list*) malloc(sizeof(list));
+	new_node->data = (void*) new_data;
+	new_node->next = NULL;
+	last->next = new_node;
+}
+
 /* ---- Fin fonctions utilitaires ---- */
 
+int send_tlv(union tlv * tlv_to_send, int tlv_size, struct sockaddr_in6 * dest_list[], int dest_list_size, int socket_num){
+	// debug_print("Building packet to send a TLV.");
+
+	// We first need to build the packet,
+	char packet_buff[1024];
+	struct packet pack;
+	pack.magic = 95;
+	pack.version = 1;
+	if (tlv_size > 1020) {
+		perror(">> Unable to send the tlv, it's size if above 1020 bytes.");
+		return -1;
+	} else {
+		memcpy((void *) pack.body, tlv_to_send, tlv_size);
+	}
+
+	// Move the content of the paquet struct to a buffer
+	// That will be send out in a vectorized buffer.
+	// packet_buff = (char *) pack;
+	memcpy(&packet_buff,&pack,1024);
+
+	// debug_print("Packet has been built.");
+
+    // Vectorized buffer
+    struct iovec vec_buff = { .iov_len = sizeof(packet_buff), .iov_base = packet_buff };
+
+	int error_while_sending = 0;
+
+	// For every dest
+	for (size_t i = 0; i < dest_list_size; i++) {
+		// Creating the struct to send out with sendmsg
+		struct msghdr packet_tlv_send_out = {
+			.msg_name = &dest_list[i],
+			.msg_namelen = sizeof(dest_list[i]),
+			.msg_iov = &vec_buff,
+			.msg_iovlen = 1 // We have only one iovec buffer. But if we had 2, we would write 2.
+		};
+
+		int response_code = sendmsg((int) socket_num, &packet_tlv_send_out, 0);
+		if (response_code < 0) {
+			// debug_print("Unable to send out the packet to peer %i", i);
+			error_while_sending = 1;
+			continue;
+		} else if (response_code < sizeof(packet_tlv_send_out)) {
+			// debug_print("Sent out only part of the packet.");
+			error_while_sending = 1;
+			continue;
+		} else {
+			// debug_print("Send out packet to peer %i", i);
+		}
+	}
+
+	if (error_while_sending == 1) {
+		// debug_print("Error occured while sending out a packet.");
+		return -1;
+	} else {
+		return 0;
+	}
+}
+
 // We need to make sure the TLV announces a length that will no go onto
 // another tlv, as we might end up reading bullshit.
 int validate_tlv(char *data, int pos, short packet_len){
@@ -61,7 +238,7 @@ int validate_tlv(char *data, int pos, short packet_len){
     unsigned char tlv_len = data[pos+1];
 
     // Check that the tlv does not exceed the packet length
-    if(pos + length >= packet_len)
+    if(pos + tlv_len >= packet_len)
         return -1;
 
     // Returns the type of the tlv or -1 if something went wrong
@@ -99,9 +276,9 @@ int validate_tlv(char *data, int pos, short packet_len){
 // For every packet recivied,
 // then we make sure it's conform
 // We then extract the data from it to make it easy to work with
-int check_header(char * req[], int buffer_size, struct packet * packet_to_return){
+int check_header(char * received_datagram[], int buffer_len, struct packet * packet_to_return){
 
-    packet * packet_to_return = (packet*) req;
+    packet_to_return = (packet*) received_datagram;
 
     // We need to check a few things ;
     // The first byte must be worth 95,
@@ -116,7 +293,7 @@ int check_header(char * req[], int buffer_size, struct packet * packet_to_return
         return -1;
     }
 
-    if (packet_to_return.length + 4 > buffer_size  ) {
+    if (packet_to_return->length + 4 > buffer_len  ) {
         perror(">> The packet length is bigger than the UDP datagram, which is not possible with the current laws of physics.");
         return -1;
     }
@@ -132,91 +309,175 @@ int update_neighbours(){
 };
 
 // We then look at the differents TLVs in the packet.
-void work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
+int work_with_tlvs(char * data[], short packet_len, struct sockaddr_in6 sender){
     int pos = 0;
-    unsigned char tlv_len;
+    unsigned char tlv_len, hash[16], warn[32];
-    tlv tmp_tlv;
+    tlv new_tlv, cur_tlv;
+    list *tmp_list;
+    pub_data *pdata;
+
+	struct neighbour_peer * random_neighbour;
+
 
     while(pos < packet_len) {
         switch(validate_tlv(data, pos, packet_len)) {
             case 0:
                 // We received a padding tlv so it is ignored
                 pos += 1;
+
                 break;
             case 1:
                 // We received a padding tlv so it is ignored
                 tlv_len = data[pos+1];
                 pos += tlv_len + 2;
+
                 break;
             case 2:
                 // We received a neighbour request so a random neighbor tlv has to be sent
+
+                // Send a neighbour tlv
+				random_neighbour = get_random_neighbour();
+                build_neighbour(&new_tlv, random_neighbour->ip, random_neighbour->port);
+
+                // NOT FINISHED - What packet is it added to?
+                // add_tlv(packet, &new_tlv, 3);
+
+                // The position is updated
                 tlv_len = data[pos+1];
                 pos += tlv_len + 2;
 
-                // Send a neighbour tlv
-                neighbour_peer *random = get_random_neighbour();
-                build_neighbour(&tmp_tlv, random->ip, random->port);
-
-                // NOT FINISHED - What packet is it added to?
-                add_tlv(packet, &tmp_tlv, 3);
                 break;
             case 3:
                 // We received a neighbour tlv so a tlv network hash is sent to that address
-            	neighbour* cur_tlv = ((neighbour*) data) + pos;
+            	cur_tlv.neighbour = (neighbour*) (data + pos);
-            	struct in6_addr ip = cur_tlv->ip;
-				short port = cur_tlv->port;
 
+                // Build network hash
+                build_network_hash(&new_tlv, data_list);
+
+                // NOT FINISHED - What packet is it added to?
+                // add_tlv(packet, &new_tlv, 4);
+
+                // The position is updated
                 tlv_len = data[pos+1];
                 pos += tlv_len + 2;
 
-                // Build network hash
-                unsigned char hash[16];
-                hash_network(neighbour_list, hash);
-                build_network_hash(&tmp_tlv, hash);
-
-                // NOT FINISHED - What packet is it added to?
-                add_tlv(packet, &tmp_tlv, 4);
                 break;
             case 4:
-                // We reveived a network hash tlv so
+                // We reveived a network hash tlv so we compare the hash with our own, if they differ we send a network state request tlv
-                tlv_len = data[pos+1];
+            	cur_tlv.network_hash = (network_hash*) (data + pos);
-                pos += tlv_len +2;
+            	hash_network(data_list, hash);
+
+            	if(memcmp(hash, cur_tlv.network_hash->network_hash, 16) == 0) {
+                	build_network_state_req(&new_tlv);
+                	// NOT FINISHED - What packet is it added to?
+                	// add_tlv(packet, &new_tlv, 5);
+            	}
+
+                // The position is updated
+                tlv_len = data[pos+1];
+                pos += tlv_len + 2;
 
-                // NOT FINISHED - Where is network_hash?
-                build_neighbour(&tmp_tlv, network_hash);
-                // NOT FINISHED - What packet is it added to?
-                add_tlv(packet, &tmp_tlv, 4);
                 break;
             case 5:
                 // We received a network state request tlv so a series of tlv node hash have to be sent for each data known
-                pos += 2;
 
-                // NOT FINISHED - for each known data
+                // for each known data build a node hash and add to packet
-                list *tmp_list = data_list;
+                tmp_list = data_list;
-                pub_data *tmp_data;
 
                 while(tmp_list != NULL) {
-                	tmp_data = (pub_data*) tmp_list->data;
+                	pdata = (pub_data*) tmp_list->data;
-                	build_node_hash(&tmp_tlv, tmp_data->id, tmp_data->seqno);
+                	build_node_hash(&new_tlv, pdata->id, pdata->seqno, pdata->data);
+                	// NOT FINISHED - What packet is it added to?
+                	// add_tlv(packet, &new_tlv, 4);
                 }
 
+                // The position is updated
+                pos += 2;
+
                 break;
             case 6:
-                // We received a node hash tlv
+                // We received a node hash tlv so if there is no entry for node_id in the data list or the hashes differ we send a node state request, if the hashes are identical nothing has to be done
+            	cur_tlv.node_hash = (node_hash*) (data + pos);
+            	pdata = get_data(cur_tlv.node_hash->node_id);
+
+            	// If data is found for this id then we check that both hashes are the same
+            	if(pdata != NULL) {
+            		// We hash the data stored in the data list
+            		hash_data(pdata, hash);
+
+            		// If both hashes are the same then nothing has to be done
+            		if(memcmp(hash, cur_tlv.node_hash->node_hash, 16) != 0) {
+            			// The position is updated
+            			tlv_len = data[pos+1];
+               			pos += 2;
+
+               			break;
+            		}
+
+            	}
+
+            	// If no pub_data was found or the hashes differ then we send a node state request
+            	build_node_state_req(&new_tlv, cur_tlv.node_hash->node_id);
+            	// NOT FINISHED - What packet is it added to?
+            	// add_tlv(packet, &new_tlv, 7);
+
+            	// The position is updated
+            	tlv_len = data[pos+1];
+                pos += tlv_len + 2;
+
                 break;
             case 7:
-                // We received a node state request tlv
+                // We received a node state request tlv so a node state tlv for this node id has to be sent, if no pub_data exists for this id nothing is sent
+            	cur_tlv.node_state_req = (node_state_req*) (data + pos);
+            	pdata = get_data(cur_tlv.node_state_req->node_id);
+
+            	if(pdata != NULL) {
+            		build_node_state(&new_tlv, pdata->id, pdata->seqno, pdata->data, pdata->length);
+            		// NOT FINISHED - What packet is it added to?
+            		// add_tlv(packet, &new_tlv, 8);
+            	}
+
+            	// The position is updated
+            	tlv_len = data[pos+1];
+                pos += tlv_len + 2;
+
                 break;
             case 8:
-                // We received a node state tlv
+                // We received a node state tlv so we add it to the data list or update the data stored
+            	cur_tlv.node_state = (node_state*) (data + pos);
+
+            	add_data(cur_tlv.node_state->length - 26, cur_tlv.node_state->node_id, cur_tlv.node_state->seqno, cur_tlv.node_state->data);
+
+            	// The position is updated
+            	tlv_len = data[pos+1];
+                pos += tlv_len + 2;
+
                 break;
             case 9:
                 // We received a warning tlv so it's message is printed
+            	cur_tlv.warning = (warning*) (data + pos);
+
+            	// Print exactly new_tlv.length characters from new_tlv.message
+            	sprintf(warn, ">> WARNING:\n%%.%ds", cur_tlv.warning->length + 1);
+            	printf(warn, cur_tlv.warning->message);
+
+            	// The position is updated
+            	tlv_len = data[pos+1];
+                pos += tlv_len + 2;
+
                 break;
             default:
-                return ;
+            	// A malformed packet was found so we stop looking for more packets and send a warning tlv
+            	strcpy(warn, "Packet is malformed.");
+            	build_warning(&new_tlv, warn, strlen(warn));
+            	// NOT FINISHED - What packet is it added to?
+            	// add_tlv(packet, &new_tlv, 9);
+
+                return -1;
         }
     }
+
+    return 0;
 }
 
 // We listen forever for new paquets;
@@ -280,7 +541,7 @@ void listen_for_packets(){
 
         // struct tlv_list received_tlvs;
         // if (validate_tlvs(formated_rec_datagram) < 0)
-        int nbr_success_tlv = work_with_tlvs(formated_rec_datagram, &req, sender);
+        int nbr_success_tlv = work_with_tlvs(&req, 1024, sender);
         if (nbr_success_tlv < 0){
             perror(">> Error while treating the TLVs of the packet.");
             printf(">> Managed to deal with %i TLVs\n", -nbr_success_tlv );
@@ -291,12 +552,13 @@ void listen_for_packets(){
 }
 
 int main(int argc, const char *argv[]) {
+	printf(">> Starting node\n");
     int cont = 1;
 
     while(cont){
 
         // We create the neighbourhood table
-        neighbour_peer neighbour_list[NEIGHBOUR_MAX];
+        // neighbour_peer neighbour_list[NEIGHBOUR_MAX];
         // We create the message table
 
         // We create our own message.

src/node.h

@@ -13,6 +13,7 @@
 
 #include "tlv.h"
 #include "hash.h"
+#include "parser.h"
 
 // On which port do we listen to
 #define LISTEN_PORT 1212
@@ -65,20 +66,29 @@ static list *neighbour_list;
 // fonctions signatures
 void listen_for_packets();
 
-int check_header(char * received_datagram[], int len, struct packet pack);
+int check_header(char * received_datagram[], int buffer_len, struct packet * packet_to_return);
 
 int validate_tlvs(struct packet * pack, struct tlv_list * tlv_l);
 
 int update_neighbours();
 
-int work_with_tlvs(struct packet received_packet, char * data_from_packet[], struct sockaddr_in6 sender);
+int work_with_tlvs(char * data[], short packet_len, struct sockaddr_in6 sender);
 
-void add_tlv(packet *packet, tlv *tlv, char type);
+void add_tlv(struct packet *packet, union tlv *tlv, char type);
 
-int send_packet(struct tlv_list tlvs_to_send, );
+// int send_packet();
+
+/* Takes a TLV and sends it over to everyone in the list of addresses.
+ * Returns -1 in case of error, 0 otherwise.
+ */
+int send_tlv(union tlv * tlv_to_send, int tlv_size, struct sockaddr_in6 * dest_list[], int dest_list_size, int socket_num);
+
+/* Takes a list of TLV and sends them over to everyone in the list of addresses.
+ * Returns -1 in case of error, 0 otherwise.
+ */
+int send_tlvs(struct list * tlv_list, int tlv_size, struct sockaddr_in6 * dest_list[], int dest_list_size, int socket_num);
 
 // threaded functions
-
 void t_ask_for_more_peers();
 
 void t_update_neighbours();
@@ -90,4 +100,13 @@ int len_list(list *l);
 
 neighbour_peer *get_random_neighbour();
 
+// get data associated with id, if it doesn't exist return NULL
+pub_data *get_data(long id);
+
+// Take data as args and create a pub_data structure in the heap
+pub_data *copy_data(unsigned char len, long id, short seqno, char *data);
+
+// add new data to data list
+void add_data(unsigned char len, long id, short seqno, char *data);
+
 #endif

src/tlv.c

@@ -18,7 +18,12 @@ int build_tlv(tlv *tlv, cmd_token token) {
 		case ERROR:
 			printf("Wrong format, use 'req {neighbour | network state | node state}' or 'post {message}'");
 			break;
+		default:
+			perror("Unrecognized tlv type.");
+			return -1;
 	}
+
+	return -1;
 }
 
 int build_pad1(tlv *tlv) {
@@ -79,7 +84,7 @@ int build_neighbour(tlv *tlv, struct in6_addr ip, short port) {
 	return 0;
 }
 
-int build_network_hash(tlv *tlv, char *hash) {
+int build_network_hash(tlv *tlv, list *data_list) {
 	network_hash *new = (network_hash*) malloc(sizeof(network_hash));
 
 	if(new == NULL)
@@ -87,7 +92,7 @@ int build_network_hash(tlv *tlv, char *hash) {
 
 	new->type = 4;
 	new->length = 16;
-	memcpy(new->network_hash, hash, 16);
+	hash_network(data_list, new->network_hash);
 
 	tlv->network_hash = new;
 
@@ -108,7 +113,7 @@ int build_network_state_req(tlv *tlv) {
 	return 0;
 }
 
-int build_node_hash(tlv *tlv, long node_id, short seqno, char *hash) {
+int build_node_hash(tlv *tlv, long node_id, short seqno, char *data) {
 	node_hash *new = (node_hash*) malloc(sizeof(node_hash));
 
 	if(new == NULL)
@@ -118,7 +123,9 @@ int build_node_hash(tlv *tlv, long node_id, short seqno, char *hash) {
 	new->length = 26;
 	new->node_id = node_id;
 	new->seqno = seqno;
-	memcpy(new->node_hash, hash, 16);
+
+	pub_data pdata = (pub_data) {.id = node_id, .seqno = seqno, .data = data};
+	hash_data(&pdata, new->node_hash);
 
 	tlv->node_hash = new;
 
@@ -140,9 +147,9 @@ int build_node_state_req(tlv *tlv, long node_id) {
 	return 0;
 }
 
-int build_node_state(tlv *tlv, long node_id, short seqno, char *node_hash, char *data) {
+int build_node_state(tlv *tlv, long node_id, short seqno, char *data, size_t data_len) {
 	node_state *new = (node_state*) malloc(sizeof(node_state));
-	int len = strlen(data);
+	int len = data_len + 26;
 
 	if(new == NULL)
 		return -1;
@@ -157,17 +164,19 @@ int build_node_state(tlv *tlv, long node_id, short seqno, char *node_hash, char
 	new->length = 26 + len;
 	new->node_id = node_id;
 	new->seqno = seqno;
-	memcpy(new->node_hash, node_hash, 16);
 	memcpy(new->data, data, len);
 
+	pub_data pdata = (pub_data) {.id = node_id, .seqno = seqno, .data = data};
+	hash_data(&pdata, new->node_hash);
+
 	tlv->node_state = new;
 
 	return 0;
 }
 
-int build_warning(tlv *tlv, char *message) {
+int build_warning(tlv *tlv, char *message, size_t message_len) {
 	warning *new = (warning*) malloc(sizeof(warning));
-	int len = strlen(message);
+	int len = message_len;
 
 	if(new == NULL)
 		return -1;

src/tlv.h

@@ -4,8 +4,10 @@
 #include <sys/socket.h>
 #include <netinet/in.h>
 #include <stdlib.h>
-#include "parser.h"
+
+#include "node.h"
 #include "hash.h"
+#include "parser.h"
 
 #define LEN_NEIGHBOUR_REQ 0
 #define LEN_NEIGHBOUR 18
@@ -33,7 +35,7 @@ typedef struct pad1 {
 typedef struct padn {
 	unsigned char type;
 	unsigned char length;
-	char mbz[256];
+	char *mbz;
 } padn;
 
 // 2 octets
@@ -110,18 +112,18 @@ typedef union tlv {
 } tlv;
 
 // build tlv from token
-int build_tlv(tlv *tlv, cmd_token token);
+int build_tlv(tlv *tlv, struct cmd_token token);
 
 // build specific tlv
 int build_pad1(tlv *tlv);
 int build_padn(tlv *tlv, size_t len);
-int build_neighbour_req(tlv *tlv);
+int build_neighbour_req(union tlv *tlv);
 int build_neighbour(tlv *tlv, struct in6_addr ip, short port);
-int build_network_hash(tlv *tlv, char *network_hash);
+int build_network_hash(tlv *tlv, struct list *data_list);
 int build_network_state_req(tlv *tlv);
-int build_node_hash(tlv *tlv, long node_id, short seqno, char *node_hash);
+int build_node_hash(tlv *tlv, long node_id, short seqno, char *data);
 int build_node_state_req(tlv *tlv, long node_id);
-int build_node_state(tlv *tlv, long node_id, short seqno, char *node_hash, char *data);
+int build_node_state(tlv *tlv, long node_id, short seqno, char *data, size_t data_len);
-int build_warning(tlv *tlv, char *message);
+int build_warning(tlv *tlv, char *message, size_t message_len);
 
 #endif