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Fixed sending messages

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Fixed return types
Fixed signatures
Fixed *some* warnings
This commit is contained in:
n07070 2020-04-14 19:32:15 +02:00
parent 52aa2c653f
commit f294be3ba2
7 changed files with 70 additions and 55 deletions
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6
src/hash.c
View File

@ -11,7 +11,7 @@ void hash_data(pub_data *data, unsigned char *buf) {
unsigned char hash[SHA256_DIGEST_LENGTH];
SHA256(concat, totlen, hash);
// Put truncated hash into buf
// Put truncated hash into buf
hash_trunc(hash, buf);
}
@ -33,7 +33,7 @@ void hash_network(list *data_list, unsigned char *buf) {
// Hash all of concat to obtain the network hash
SHA256(concat, totlen, hash);
// Put truncated hash into buf
// Put truncated hash into buf
hash_trunc(hash, buf);
// Get rid of concat
@ -57,4 +57,4 @@ void concat_data(pub_data *data, unsigned char *buf) {
void concat_hash(unsigned char *hash1, unsigned char *hash2, size_t size) {
hash1 = (unsigned char*) realloc(hash1, size + 16);
memcpy(hash1+size, hash2, 16);
}
}

12
src/hash.h
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@ -2,22 +2,24 @@
#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);
#endif
#endif

76
src/node.c
View File

@ -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 ---- */
@ -61,7 +64,7 @@ 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) {
pub_data *new_data = (pub_data*) malloc(sizeof(pub_data));
char *_data = (char*) malloc(len);
char *_data = (char*) malloc(len);
new_data->length = len;
new_data->id = id;
new_data->seqno = seqno;
@ -120,7 +123,7 @@ void add_data(unsigned char len, long id, short seqno, char *data) {
// Else, we update the last node
new_node = (list*) malloc(sizeof(list));
new_node->data = (void*) new_data;
new_node->next = tmp;
new_node->next = tmp;
last->next = new_node;
return;
@ -154,33 +157,33 @@ void add_data(unsigned char len, long id, short seqno, char *data) {
// Update list
new_node = (list*) malloc(sizeof(list));
new_node->data = (void*) new_data;
new_node->next = NULL;
new_node->next = NULL;
last->next = new_node;
}
/* ---- Fin fonctions utilitaires ---- */
int send_tlv(struct tlv tlv_to_send, int tlv_type, struct sockaddr_in6 * dest_list[], int dest_list_size, int sock_num){
debug_print("Building packet to send a TLV.");
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(sizeof(tlv_to_send) > 1020){
debug_print("Unable to send TLV, the size is bigger than 1020 bits.");
if (tlv_size > 1020) {
perror(">> Unable to send the tlv, it's size if above 1020 bytes.");
return -1;
} else {
pack.length = sizeof(tlv_to_send);
strcpy(pack.body, (char) tlv_to_send);
memcpy((void *) pack.body, tlv_to_send, tlv_size);
}
// Casting the struct to a buffer.
packet_buff = (char *) pack;
// 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.");
// debug_print("Packet has been built.");
// Vectorized buffer
struct iovec vec_buff = { .iov_len = sizeof(packet_buff), .iov_base = packet_buff };
@ -197,22 +200,22 @@ int send_tlv(struct tlv tlv_to_send, int tlv_type, struct sockaddr_in6 * dest_li
.msg_iovlen = 1 // We have only one iovec buffer. But if we had 2, we would write 2.
};
response_code = sendmsg((int) sock_num, &packet_tlv_send_out, 0);
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);
// 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.");
// debug_print("Sent out only part of the packet.");
error_while_sending = 1;
continue;
} else {
debug_print("Send out packet to peer %i", i);
// debug_print("Send out packet to peer %i", i);
}
}
if (error_while_sending == 1) {
debug_print("Error occured while sending out a packet.");
// debug_print("Error occured while sending out a packet.");
return -1;
} else {
return 0;
@ -273,9 +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,
@ -290,7 +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;
}
@ -306,13 +309,16 @@ int update_neighbours(){
};
// We then look at the differents TLVs in the packet.
int 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, hash[16], warn[32];
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:
@ -330,11 +336,11 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
// We received a neighbour request so a random neighbor tlv has to be sent
// Send a neighbour tlv
neighbour_peer *random = get_random_neighbour();
build_neighbour(&new_tlv, random->ip, random->port);
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);
// add_tlv(packet, &new_tlv, 3);
// The position is updated
tlv_len = data[pos+1];
@ -349,7 +355,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
build_network_hash(&new_tlv, data_list);
// NOT FINISHED - What packet is it added to?
add_tlv(packet, &new_tlv, 4);
// add_tlv(packet, &new_tlv, 4);
// The position is updated
tlv_len = data[pos+1];
@ -364,7 +370,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
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);
// add_tlv(packet, &new_tlv, 5);
}
// The position is updated
@ -382,7 +388,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
pdata = (pub_data*) tmp_list->data;
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);
// add_tlv(packet, &new_tlv, 4);
}
// The position is updated
@ -413,7 +419,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
// 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);
// add_tlv(packet, &new_tlv, 7);
// The position is updated
tlv_len = data[pos+1];
@ -428,7 +434,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
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);
// add_tlv(packet, &new_tlv, 8);
}
// The position is updated
@ -450,7 +456,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
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);
@ -465,7 +471,7 @@ int work_with_tlvs(char *data, short packet_len, struct sockaddr_in6 sender){
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);
// add_tlv(packet, &new_tlv, 9);
return -1;
}
@ -535,7 +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 );
@ -551,7 +557,7 @@ int main(int argc, const char *argv[]) {
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.

13
src/node.h
View File

@ -13,6 +13,7 @@
#include "tlv.h"
#include "hash.h"
#include "parser.h"
// On which port do we listen to
#define LISTEN_PORT 1212
@ -65,27 +66,27 @@ 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();
// 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(struct tlv tlv_to_send, int tlv_type, struct sockaddr_in6 * dest_list[], int dest_list_size, int socket_num);
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_type, struct sockaddr_in6 * dest_list[], int dest_list_size, int socket_num);
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();

2
src/parser.h
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@ -16,4 +16,4 @@ typedef struct cmd_token {
// retourne le type de commande à exécuter
cmd_token parse_cmd();
#endif
#endif

5
src/tlv.c
View File

@ -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) {

11
src/tlv.h
View File

@ -4,9 +4,10 @@
#include <sys/socket.h>
#include <netinet/in.h>
#include <stdlib.h>
#include "parser.h"
#include "hash.h"
#include "node.h"
#include "hash.h"
#include "parser.h"
#define LEN_NEIGHBOUR_REQ 0
#define LEN_NEIGHBOUR 18
@ -111,14 +112,14 @@ 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, list *data_list);
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 *data);
int build_node_state_req(tlv *tlv, long node_id);