diff --git a/testing/DHT_test.c b/testing/DHT_test.c
index d76057c1..3cd1bce6 100644
--- a/testing/DHT_test.c
+++ b/testing/DHT_test.c
@@ -90,7 +90,7 @@ void print_friendlist(DHT *dht)
         }
 
         int friendok = DHT_getfriendip(dht, dht->friends_list[k].client_id, &p_ip);
-        printf("\nIP: %s:%u", ip_ntoa(&p_ip.ip), ntohs(p_ip.port));
+        printf("\nIP: %s:%u (%d)", ip_ntoa(&p_ip.ip), ntohs(p_ip.port), friendok);
 
         printf("\nCLIENTS IN LIST:\n\n");
 
diff --git a/testing/misc_tools.c b/testing/misc_tools.c
index 81f5ed8a..d05c88f6 100644
--- a/testing/misc_tools.c
+++ b/testing/misc_tools.c
@@ -36,10 +36,9 @@
 /* TODO: rewrite */
 unsigned char *hex_string_to_bin(char hex_string[])
 {
-    size_t len = strlen(hex_string);
+    size_t i, len = strlen(hex_string);
     unsigned char *val = malloc(len);
     char *pos = hex_string;
-    int i;
 
     for (i = 0; i < len; ++i, pos += 2)
         sscanf(pos, "%2hhx", &val[i]);
diff --git a/testing/nTox.c b/testing/nTox.c
index 029d62b4..e87b4b83 100644
--- a/testing/nTox.c
+++ b/testing/nTox.c
@@ -133,10 +133,10 @@ void get_id(Tox *m, char *data)
 {
     sprintf(data, "[i] ID: ");
     int offset = strlen(data);
-    int i = 0;
     uint8_t address[TOX_FRIEND_ADDRESS_SIZE];
     tox_getaddress(m, address);
 
+    uint32_t i = 0;
     for (; i < TOX_FRIEND_ADDRESS_SIZE; i++) {
         sprintf(data + 2 * i + offset, "%02X ", address[i]);
     }
@@ -275,13 +275,13 @@ void line_eval(Tox *m, char *line)
 
             char numstring[len - 3];
             char message[len - 3];
-            int i;
+            uint32_t i;
 
             for (i = 0; i < len; i++) {
                 if (line[i + 3] != ' ') {
                     numstring[i] = line[i + 3];
                 } else {
-                    int j;
+                    uint32_t j;
 
                     for (j = (i + 1); j < (len + 1); j++)
                         message[j - i - 1] = line[j + 3];
@@ -299,8 +299,7 @@ void line_eval(Tox *m, char *line)
             }
         } else if (inpt_command == 'n') {
             uint8_t name[TOX_MAX_NAME_LENGTH];
-            int i = 0;
-            size_t len = strlen(line);
+            size_t i, len = strlen(line);
 
             for (i = 3; i < len; i++) {
                 if (line[i] == 0 || line[i] == '\n') break;
@@ -317,8 +316,7 @@ void line_eval(Tox *m, char *line)
             print_friendlist(m);
         } else if (inpt_command == 's') {
             uint8_t status[TOX_MAX_STATUSMESSAGE_LENGTH];
-            int i = 0;
-            size_t len = strlen(line);
+            size_t i, len = strlen(line);
 
             for (i = 3; i < len; i++) {
                 if (line[i] == 0 || line[i] == '\n') break;
@@ -399,8 +397,7 @@ void line_eval(Tox *m, char *line)
 void wrap(char output[STRING_LENGTH], char input[STRING_LENGTH], int line_width)
 {
     strcpy(output, input);
-    size_t len = strlen(output);
-    int i = 0;
+    size_t i, len = strlen(output);
 
     for (i = line_width; i < len; i = i + line_width) {
         while (output[i] != ' ' && i != 0) {
@@ -415,9 +412,8 @@ void wrap(char output[STRING_LENGTH], char input[STRING_LENGTH], int line_width)
 
 int count_lines(char *string)
 {
-    size_t len = strlen(string);
+    size_t i, len = strlen(string);
     int count = 1;
-    int i;
 
     for (i = 0; i < len; i++) {
         if (string[i] == '\n')
@@ -511,7 +507,7 @@ static char *data_file_name = NULL;
 static int load_data(Tox *m)
 {
     FILE *data_file = fopen(data_file_name, "r");
-    int size = 0;
+    size_t size = 0;
     if (data_file) {
         fseek(data_file, 0, SEEK_END);
         size = ftell(data_file);
@@ -520,6 +516,7 @@ static int load_data(Tox *m)
         uint8_t data[size];
         if (fread(data, sizeof(uint8_t), size, data_file) != size) {
             fputs("[!] could not read data file!\n", stderr);
+            fclose(data_file);
             return 0;
         }
 
@@ -545,19 +542,22 @@ static int save_data(Tox *m)
         return 0;
     }
 
-    int size = tox_size(m);
+    int res = 1;
+    size_t size = tox_size(m);
     uint8_t data[size];
     tox_save(m, data);
 
     if (fwrite(data, sizeof(uint8_t), size, data_file) != size) {
         fputs("[!] could not write data file (1)!", stderr);
-        return 0;
+        res = 0;
     }
 
     if (fclose(data_file) < 0) {
         perror("[!] could not write data file (2)");
-        return 0;
+        res = 0;
     }
+
+    return res;
 }
 
 static int load_data_or_init(Tox *m, char *path)
@@ -667,7 +667,7 @@ int main(int argc, char *argv[])
     nodelay(stdscr, TRUE);
 
     new_lines("[i] change username with /n");
-    char name[TOX_MAX_NAME_LENGTH];
+    uint8_t name[TOX_MAX_NAME_LENGTH];
     uint16_t namelen = tox_getselfname(m, name, sizeof(name));
     if (namelen > 0) {
         char whoami[128 + TOX_MAX_NAME_LENGTH];
diff --git a/toxcore/DHT.c b/toxcore/DHT.c
index 2f7b2263..db9bfe3c 100644
--- a/toxcore/DHT.c
+++ b/toxcore/DHT.c
@@ -200,8 +200,8 @@ static void get_close_nodes_inner(DHT *dht, uint8_t *client_id, Node_format *nod
                                   time_t timestamp, int *num_nodes_ptr)
 {
     int num_nodes = *num_nodes_ptr;
-    int i, tout, inlist, ipv46x, j, closest;
-
+    int tout, inlist, ipv46x, j, closest;
+    uint32_t i;
     for (i = 0; i < client_list_length; i++) {
         Client_data *client = &client_list[i];
         tout = is_timeout(timestamp, client->timestamp, BAD_NODE_TIMEOUT);
@@ -726,10 +726,10 @@ static int handle_sendnodes(void *object, IP_Port source, uint8_t *packet, uint3
 #ifdef TOX_ENABLE_IPV6
     Node4_format *nodes4_list = (Node4_format *)(plain + sizeof(ping_id));
 
-    int num_nodes_ok = 0;
+    uint32_t num_nodes_ok = 0;
 
     for (i = 0; i < num_nodes; i++)
-        if ((nodes4_list[i].ip_port.ip.uint32 != 0) && (nodes4_list[i].ip_port.ip.uint32 != ~0)) {
+        if ((nodes4_list[i].ip_port.ip.uint32 != 0) && (nodes4_list[i].ip_port.ip.uint32 != (uint32_t)~0)) {
             memcpy(nodes_list[num_nodes_ok].client_id, nodes4_list[i].client_id, CLIENT_ID_SIZE);
             nodes_list[num_nodes_ok].ip_port.ip.family = AF_INET;
             nodes_list[num_nodes_ok].ip_port.ip.ip4.uint32 = nodes4_list[i].ip_port.ip.uint32;
@@ -1477,14 +1477,14 @@ void DHT_save(DHT *dht, uint8_t *data)
 int DHT_load(DHT *dht, uint8_t *data, uint32_t size)
 {
     if (size < sizeof(dht->close_clientlist)) {
-        fprintf(stderr, "DHT_load: Expected at least %lu bytes, got %u.\n", sizeof(dht->close_clientlist), size);
+        fprintf(stderr, "DHT_load: Expected at least %u bytes, got %u.\n", sizeof(dht->close_clientlist), size);
         return -1;
     }
 
     uint32_t friendlistsize = size - sizeof(dht->close_clientlist);
 
     if (friendlistsize % sizeof(DHT_Friend) != 0) {
-        fprintf(stderr, "DHT_load: Expected a multiple of %lu, got %u.\n", sizeof(DHT_Friend), friendlistsize);
+        fprintf(stderr, "DHT_load: Expected a multiple of %u, got %u.\n", sizeof(DHT_Friend), friendlistsize);
         return -1;
     }
 
diff --git a/toxcore/Messenger.c b/toxcore/Messenger.c
index eb18e3a3..c46e3938 100644
--- a/toxcore/Messenger.c
+++ b/toxcore/Messenger.c
@@ -1220,7 +1220,7 @@ void doInbound(Messenger *m)
 }
 
 #ifdef LOGGING
-#define DUMPING_CLIENTS_FRIENDS_EVERY_N_SECONDS 60
+#define DUMPING_CLIENTS_FRIENDS_EVERY_N_SECONDS 60UL
 static time_t lastdump = 0;
 static char IDString[CLIENT_ID_SIZE * 2 + 1];
 static char *ID2String(uint8_t *client_id)
diff --git a/toxcore/network.c b/toxcore/network.c
index 4b6dc3be..4f6b0aae 100644
--- a/toxcore/network.c
+++ b/toxcore/network.c
@@ -154,14 +154,15 @@ static int receivepacket(sock_t sock, IP_Port *ip_port, uint8_t *data, uint32_t
 #ifdef WIN32
     int addrlen = sizeof(addr);
 #else
-    uint32_t addrlen = sizeof(addr);
+    socklen_t addrlen = sizeof(addr);
 #endif
-    (*(int32_t *)length) = recvfrom(sock, (char *) data, MAX_UDP_PACKET_SIZE, 0, (struct sockaddr *)&addr, &addrlen);
+    *length = 0;
+    int fail_or_len = recvfrom(sock, (char *) data, MAX_UDP_PACKET_SIZE, 0, (struct sockaddr *)&addr, &addrlen);
 
-    if (*(int32_t *)length <= 0) {
+    if (fail_or_len <= 0) {
 #ifdef LOGGING
 
-        if ((length < 0) && (errno != EWOULDBLOCK)) {
+        if ((fail_or_len < 0) && (errno != EWOULDBLOCK)) {
             sprintf(logbuffer, "Unexpected error reading from socket: %u, %s\n", errno, strerror(errno));
             loglog(logbuffer);
         }
@@ -170,6 +171,8 @@ static int receivepacket(sock_t sock, IP_Port *ip_port, uint8_t *data, uint32_t
         return -1; /* Nothing received or empty packet. */
     }
 
+    *length = (uint32_t)fail_or_len;
+
 #ifdef TOX_ENABLE_IPV6
 
     if (addr.ss_family == AF_INET) {
@@ -863,15 +866,15 @@ static void loglogdata(char *message, uint8_t *buffer, size_t buflen, IP_Port *i
                  ip_ntoa(&ip_port->ip), ntohs(ip_port->port), errno,
                  strerror(errno), buflen > 4 ? ntohl(*(uint32_t *)&buffer[1]) : 0,
                  buflen > 7 ? ntohl(*(uint32_t *)(&buffer[5])) : 0);
-    else if ((res > 0) && (res <= buflen))
+    else if ((res > 0) && ((size_t)res <= buflen))
         snprintf(logbuffer, sizeof(logbuffer), "[%2u] %s %3u%c %s:%u (%u: %s) | %04x%04x\n",
-                 buffer[0], message, res < 999 ? res : 999, res < buflen ? '<' : '=',
+                 buffer[0], message, res < 999 ? res : 999, (size_t)res < buflen ? '<' : '=',
                  ip_ntoa(&ip_port->ip), ntohs(ip_port->port), 0,
                  "OK", buflen > 4 ? ntohl(*(uint32_t *)&buffer[1]) : 0,
                  buflen > 7 ? ntohl(*(uint32_t *)(&buffer[5])) : 0);
     else /* empty or overwrite */
         snprintf(logbuffer, sizeof(logbuffer), "[%2u] %s %u%c%u %s:%u (%u: %s) | %04x%04x\n",
-                 buffer[0], message, res, !res ? '0' : '>', buflen,
+                 buffer[0], message, res, !res ? '!' : '>', buflen,
                  ip_ntoa(&ip_port->ip), ntohs(ip_port->port), 0,
                  "OK", buflen > 4 ? ntohl(*(uint32_t *)&buffer[1]) : 0,
                  buflen > 7 ? ntohl(*(uint32_t *)(&buffer[5])) : 0);
diff --git a/toxcore/util.c b/toxcore/util.c
index 8960fe36..e1c46ee5 100644
--- a/toxcore/util.c
+++ b/toxcore/util.c
@@ -52,14 +52,14 @@ void loginit(uint16_t port)
     if (logfile)
         fclose(logfile);
 
-    sprintf(logbuffer, "%u-%u.log", ntohs(port), now());
+    sprintf(logbuffer, "%u-%u.log", ntohs(port), (uint32_t)now());
     logfile = fopen(logbuffer, "w");
     starttime = now();
 };
 void loglog(char *text)
 {
     if (logfile) {
-        fprintf(logfile, "%4u ", now() - starttime);
+        fprintf(logfile, "%4u ", (uint32_t)(now() - starttime));
         fprintf(logfile, text);
         fflush(logfile);
     }