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Implemented DHT

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t
2025-01-10 01:59:20 +01:00
parent b06a71186a
commit 3c3e8127c9
6 changed files with 258 additions and 54 deletions
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webserver.c
+92 -45
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@@ -16,6 +16,8 @@
#include "data.h"
#include "http.h"
#include "util.h"
#include "dht.h"
#include "lookup.h"
#define elif else if
@@ -31,7 +33,7 @@ bool _DO_UDP = false;
int _NODE_ID;
const char *_NODE_IP;
const char *_NODE_PORT;
int _NODE_PORT;
#define MAX_RESOURCES 100
@@ -87,6 +89,21 @@ void send_reply(int conn, struct request *request) {
uint16_t resource_hash = hash_uri(request->uri);
neighbor responsible = check_neighborhood(resource_hash);
lookup_request *req = find_lookup(resource_hash);
if (req != NULL)
{
if (req->message_type != 1)
{
printf("404\n");
reply = "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n";
offset = strlen(reply);
}
else
{
}
}
if (responsible == res) {
sprintf(reply, "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n");
offset = strlen(reply);
@@ -94,9 +111,19 @@ void send_reply(int conn, struct request *request) {
}
elif(responsible == res_303)
{
sprintf(reply, "HTTP/1.1 303 See Other\r\nLocation: http://%s:%d%s\r\nContent-Length: 0\r\n\r\n", _SUCC_IP, _SUCC_PORT, request->uri);
offset = strlen(reply);
printf("303\n");
int suc_id = _SUCC_ID;
if (resource_hash <= suc_id || suc_id >= 0 && suc_id < _NODE_ID)
{
printf("404\n");
reply = "HTTP/1.1 404 Not Found\r\nContent-Length: 0\r\n\r\n";
offset = strlen(reply);
}
else
{
sprintf(reply, "HTTP/1.1 303 See Other\r\nLocation: http://%s:%d%s\r\nContent-Length: 0\r\n\r\n", _SUCC_IP, _SUCC_PORT, request->uri);
offset = strlen(reply);
printf("303\n");
}
}
elif(responsible == not_res)
{
@@ -104,6 +131,10 @@ void send_reply(int conn, struct request *request) {
offset = strlen(reply);
printf("503\n");
// TODO: Call other dht
lookup_request lookreq;
lookup_request_init(&lookreq, 0, _NODE_ID, (char*)_NODE_IP, _NODE_PORT, resource_hash, NULL);
call_network(&lookreq, _SUCC_IP, _SUCC_PORT);
}
else {
printf("404\n");
@@ -364,16 +395,15 @@ neighbor check_neighborhood(uint16_t hash) {
int suc_id = _SUCC_ID;
if(pre_id == suc_id){
if(hash <= id && hash > suc_id) return res_303;
if(hash > id && hash <= suc_id) return not_res;
return res_303; // hash is in between suc and 0
if(hash > id && hash <= suc_id) return res_303;
return res;
}
// TODO: check correctness
if ((pre_id == id && suc_id == id) || (id < pre_id && ((hash > pre_id && hash < 65535)) || hash <= id) || (hash > pre_id && hash <= id))
return res;
if ((id < suc_id && hash > id && hash <= suc_id) || (hash > id || hash <= suc_id))
if ((id < suc_id && hash > id && hash <= suc_id) || (id > suc_id && (hash > id || hash <= suc_id)))
return not_res;
return dunno;
@@ -403,45 +433,60 @@ static void handle_udp_request(int _sock){
// HASH Received
// TODO: alter buffer
uint16_t hash = atoi(buffer);
printf("Hash: %u\n", hash);
// Check belonging
int pre_id = _PRED_ID;
int suc_id = _SUCC_ID;
neighbor responsibility = check_neighborhood(hash);
lookup_request lr = {0};
extract_lookup_request(&lr, buffer);
if (responsibility == res) {
char res[] = "HTTP/1.1 200 OK\r\nContent-Length: 0\r\n\r\n";
if (sendto(_sock, res, strlen(res), 0, (struct sockaddr *) &caller_addr, addrlen) == -1) {
perror("Func: handle_udp_request - failed to send 200 data to caller!");
exit(EXIT_FAILURE);
}
printf("Sent: %s", res);
}
/*
TODO: return 404
elif (responsibility == res_303) {
fprintf(stderr, "Sent 303!\n");
char res[1024] = {0};
snprintf(res, 1024, "HTTP/1.1 303 See Other\r\nLocation: http://%s:%s/%d\r\nContent-Length: 0\r\n\r\n", _NODE_IP, _NODE_PORT, suc_id);
if(sendto(_sock, res, strlen(res), 0, (struct sockaddr *) &caller_addr, addrlen) == -1){
perror("Func: handle_udp_request - failed to send 303 data to caller!");
exit(EXIT_FAILURE);
}
printf("Sent: %s", res);
}
*/
elif (responsibility == not_res) {
// TODO: DIRECT TO NEXT NODE
const char res[] = "HTTP/1.1 503 Service Unavailable\r\nRetry-After: 1\r\nContent-Length: 0\r\n\r\n";
if(sendto(_sock, res, strlen(res), 0, (struct sockaddr *) &caller_addr, addrlen) == -1)
printf("Received:\n\tMessage-type: %d\n\tlookup-hash: %hd\n", lr.message_type, lr.hash_id);
// DO LOOKUP
if (lr.message_type == 0)
{
// Check belonging
const int suc_id = _SUCC_ID;
char *callback_ip = lr.node_ip;
int callback_port = lr.node_port;
lookup_request backfire = {0};
if (lr.node_id == suc_id)
{
perror("Func: handle_udp_request - failed to send 503 data to caller!");
exit(EXIT_FAILURE);
// Send back 404 not found
clone_lookup_request(&backfire, &lr);
backfire.message_type = -1;
}
printf("Sent: %s", res);
else
{
const neighbor responsibility = check_neighborhood(lr.hash_id);
if (responsibility == res) {
lookup_request_init(&backfire, 1, _NODE_ID, (char*)_NODE_IP, _NODE_PORT, _PRED_ID, lr.node_request);
}
elif (responsibility == not_res) {
// is succ responsible
if (lr.hash_id <= suc_id)
{
lookup_request_init(&backfire, 1, suc_id, _SUCC_IP, _SUCC_PORT, _NODE_ID, lr.node_request);
}
else
{
lookup_request_init(&backfire, 1, suc_id, _SUCC_IP, _SUCC_PORT, _NODE_ID, lr.node_request);
callback_ip = _SUCC_IP; // TODO: Check validity
callback_port = _SUCC_PORT;
}
}
}
call_network(&backfire, callback_ip, callback_port);
}
elif (lr.message_type == 1)
{
lookup_request *toLookup = malloc(sizeof(lookup_request));
clone_lookup_request(toLookup, &lr);
push_lookup(toLookup);
}
else
{
//call_other_dht();
}
}
@@ -457,11 +502,13 @@ int main(int argc, char **argv) {
return EXIT_FAILURE;
}
init_lookup_table();
if(argc == 3) _NODE_ID = 0;
elif(argc == 4) _NODE_ID = atoi(argv[3]);
// Set this DHT-Nodes ID
_NODE_PORT = argv[2];
_NODE_PORT = atoi(argv[2]);
_NODE_IP = argv[1];
struct sockaddr_in addr = derive_sockaddr(argv[1], argv[2]);
@@ -534,6 +581,6 @@ int main(int argc, char **argv) {
}
}
}
free_lookup_table();
return EXIT_SUCCESS;
}