Implemented DHT

dht.c

@@ -1,14 +1,77 @@
 #include "dht.h"
+#include <stdio.h>
+#include <string.h>
+#include <netdb.h>
+#include <netinet/in.h>
+#include <sys/socket.h>
+#include <sys/types.h>
+#include <unistd.h>
 
-#define cpy(x, y, z) char *x_c = x; char *y_c = y; while(*y_c && z--) *x_c++ = *y_c++
+// #define cpy(x, y, z) char *x_c = x; char *y_c = y; while(*y_c && z--) *x_c++ = *y_c++
 
-void lookup_request_init(lookup_request* lr, int node_id, char *node_ip, int node_port, uint16_t hash_id, char *node_request)
+void build_lookup_request(lookup_request* lr){
+    char *lrreq = lr->node_request;
+    snprintf(lr->node_request, HTTP_MAX_SIZE, "%d|%hd|%d|%s|%d\r\n\r\n", lr->message_type, lr->hash_id, lr->node_id, lr->node_ip, lr->node_port);
+}
+
+void lookup_request_init(lookup_request* lr, int message_type, int node_id, char *node_ip, int node_port, uint16_t hash_id, char *node_request)
 {
-    int size = NODE_IP_MAX_SIZE;
+    lr->message_type = message_type;
     lr->node_id = node_id;
-    { cpy(lr->node_ip, node_ip, size); }
+    strncpy(lr->node_ip, node_ip, NODE_IP_MAX_SIZE);
     lr->node_port = node_port;
     lr->hash_id = hash_id;
-    size = HTTP_MAX_SIZE;
-    cpy(lr->node_request, node_request, size);
+    if(node_request != NULL)
+        strncpy(lr->node_request, node_request, HTTP_MAX_SIZE);
+    build_lookup_request(lr);
+}
+
+void extract_lookup_request(lookup_request* lr, char* request){
+    sscanf(request, "%d|%hd|%d|%s|%d\r\n\r\n", &lr->message_type, &lr->hash_id, &lr->node_id, lr->node_ip, &lr->node_port);
+}
+
+int call_network(lookup_request* lr, char *ip, int port){
+    int succ_sock;
+    struct addrinfo hints, *servinfo, *p;
+    int rv;
+    int numbytes;
+
+    memset(&hints, 0, sizeof hints);
+    hints.ai_family = AF_INET;
+    hints.ai_socktype = SOCK_DGRAM;
+
+    char port_str[6];
+    snprintf(port_str, sizeof port_str, "%d", port);
+
+    if ((rv = getaddrinfo(ip, port_str, &hints, &servinfo)) != 0) {
+        fprintf(stderr, "Func: call_network - getaddrinfo: %s\n", gai_strerror(rv));
+        return 1;
+    }
+
+    for(p = servinfo; p != NULL; p = p->ai_next) {
+        if ((succ_sock = socket(p->ai_family, p->ai_socktype, p->ai_protocol)) == -1) {
+            perror("Func: call_network - socket");
+            continue;
+        }
+        break;
+    }
+
+    if (p == NULL) {
+        fprintf(stderr, "Func: call_network - failed to create socket\n");
+        return 2;
+    }
+
+    if ((numbytes = sendto(succ_sock, lr->node_request, strlen(lr->node_request), 0, p->ai_addr, p->ai_addrlen)) == -1) {
+        perror("Func: call_network - sendto");
+        exit(1);
+    }
+
+    freeaddrinfo(servinfo);
+    close(succ_sock);
+
+    return 0;
+}
+
+void clone_lookup_request(lookup_request* dest, lookup_request* source){
+    memcpy(dest, source, sizeof(lookup_request));
 }