fix potential race conditions

src/chat.c

@@ -253,7 +253,7 @@ static void chat_onFileSendRequest(ToxWindow *self, Tox *m, int32_t num, uint8_t
 
     /* holds the lone filename */
     char filename_nopath[MAX_STR_SIZE];
-    get_file_name(filename_nopath, pathname);
+    get_file_name(filename_nopath, sizeof(filename_nopath), pathname);
     int len = strlen(filename_nopath);
 
     snprintf(msg, sizeof(msg), "File transfer request for '%s' (%llu bytes).", filename_nopath,

src/chat_commands.c

@@ -193,7 +193,7 @@ void cmd_sendfile(WINDOW *window, ToxWindow *self, Tox *m, int argc, char (*argv
     fseek(file_to_send, 0, SEEK_SET);
 
     char filename[MAX_STR_SIZE];
-    get_file_name(filename, path);
+    get_file_name(filename, sizeof(filename), path);
     int filenum = tox_new_file_sender(m, self->num, filesize, (const uint8_t *) filename, strlen(filename));
 
     if (filenum == -1) {

src/dns.c

@@ -45,6 +45,8 @@
 #define TOX_DNS3_TXT_PREFIX "v=tox3;id="
 #define DNS3_KEY_SZ 32
 
+extern struct _Winthread Winthread;
+
 /* TODO: process keys from key file instead of hard-coding like a noob */
 static struct dns3_server {
     char *name;
@@ -77,7 +79,6 @@ static struct _thread_data {
 
 static struct _dns_thread {
     pthread_t tid;
-    pthread_mutex_t lock;
 } dns_thread;
 
 
@@ -86,9 +87,9 @@ static int dns_error(ToxWindow *self, char *errmsg)
     char msg[MAX_STR_SIZE];
     snprintf(msg, sizeof(msg), "User lookup failed: %s", errmsg);
 
-    pthread_mutex_lock(&dns_thread.lock);
+    pthread_mutex_lock(&Winthread.lock);
     line_info_add(self, NULL, NULL, NULL, msg, SYS_MSG, 0, 0);
-    pthread_mutex_unlock(&dns_thread.lock);
+    pthread_mutex_unlock(&Winthread.lock);
 
     return -1;
 }
@@ -272,15 +273,15 @@ void *dns3_lookup_thread(void *data)
 
     memcpy(encrypted_id, ans_id + prfx_len, ans_len - prfx_len);
 
-    if (tox_decrypt_dns3_TXT(dns_obj, (uint8_t *) t_data.id_bin, (uint8_t *) encrypted_id, strlen(encrypted_id),
-                             request_id) == -1) {
+    if (tox_decrypt_dns3_TXT(dns_obj, (uint8_t *) t_data.id_bin, (uint8_t *) encrypted_id, 
+                             strlen(encrypted_id), request_id) == -1) {
         dns_error(self, "Core failed to decrypt DNS response.");
         kill_dns_thread(dns_obj);
     }
 
-    pthread_mutex_lock(&dns_thread.lock);
+    pthread_mutex_lock(&Winthread.lock);
     cmd_add_helper(self, t_data.m, t_data.id_bin, t_data.msg);
-    pthread_mutex_unlock(&dns_thread.lock);
+    pthread_mutex_unlock(&Winthread.lock);
 
     kill_dns_thread(dns_obj);
     return 0;
@@ -302,9 +303,10 @@ void dns3_lookup(ToxWindow *self, Tox *m, char *id_bin, char *addr, char *msg)
     t_data.m = m;
     t_data.busy = 1;
 
+    pthread_mutex_unlock(&Winthread.lock);
+
     if (pthread_create(&dns_thread.tid, NULL, dns3_lookup_thread, NULL) != 0)
         exit_toxic_err("failed in dns3_lookup", FATALERR_THREAD_CREATE);
 
-    if (pthread_mutex_init(&dns_thread.lock, NULL) != 0)
-        exit_toxic_err("failed in dns3_lookup", FATALERR_MUTEX_INIT);
+    pthread_mutex_lock(&Winthread.lock);
 }

src/misc_tools.c

@@ -194,7 +194,7 @@ int valid_nick(char *nick)
 }
 
 /* gets base file name from path or original file name if no path is supplied */
-void get_file_name(char *namebuf, const char *pathname)
+void get_file_name(char *namebuf, int bufsize, const char *pathname)
 {
     int idx = strlen(pathname) - 1;
 
@@ -213,7 +213,7 @@ void get_file_name(char *namebuf, const char *pathname)
         filename = tmpname;
     }
 
-    snprintf(namebuf, sizeof(namebuf), "%s", filename);
+    snprintf(namebuf, bufsize, "%s", filename);
 }
 
 /* converts str to all lowercase */

src/misc_tools.h

@@ -80,7 +80,7 @@ int qsort_strcasecmp_hlpr(const void *nick1, const void *nick2);
 int valid_nick(char *nick);
 
 /* gets base file name from path or original file name if no path is supplied */
-void get_file_name(char *namebuf, const char *pathname);
+void get_file_name(char *namebuf, int bufsize, const char *pathname);
 
 /* converts str to all lowercase */
 void str_to_lower(char *str);

src/prompt.c

@@ -368,7 +368,7 @@ void prompt_init_statusbar(ToxWindow *self, Tox *m)
     const char *toxic_ver = strtok(ver, "_");
 
     if ( (!strcmp("Online", statusmsg) || !strncmp("Toxing on Toxic", statusmsg, 15)) && toxic_ver != NULL) {
-        snprintf(statusmsg, sizeof(statusmsg), "Toxing on Toxic v.%s", toxic_ver);
+        snprintf(statusmsg, MAX_STR_SIZE, "Toxing on Toxic v.%s", toxic_ver);
         s_len = strlen(statusmsg);
         statusmsg[s_len] = '\0';
     }

src/toxic.c

@@ -80,10 +80,9 @@ struct arg_opts {
 struct _Winthread Winthread;
 struct user_settings *user_settings = NULL;
 
-static bool sig_exit_toxic = false;
 static void catch_SIGINT(int sig)
 {
-    sig_exit_toxic = true;
+    Winthread.sig_exit_toxic = true;
 }
 
 static void flag_window_resize(int sig)
@@ -459,9 +458,8 @@ static void do_toxic(Tox *m, ToxWindow *prompt)
     pthread_mutex_lock(&Winthread.lock);
     do_connection(m, prompt);
     do_file_senders(m);
-    pthread_mutex_unlock(&Winthread.lock);
-
     tox_do(m);    /* main tox-core loop */
+    pthread_mutex_unlock(&Winthread.lock);
 }
 
 #define INACTIVE_WIN_REFRESH_RATE 10
@@ -482,6 +480,11 @@ void *thread_winref(void *data)
             refresh_inactive_windows();
             draw_count = 0;
         }
+
+        if (Winthread.sig_exit_toxic) {
+            pthread_mutex_lock(&Winthread.lock);
+            exit_toxic_success(m);
+        }
     }
 }
 
@@ -648,13 +651,13 @@ int main(int argc, char *argv[])
         uint64_t cur_time = get_unix_time();
 
         if (timed_out(last_save, cur_time, AUTOSAVE_FREQ)) {
+            pthread_mutex_lock(&Winthread.lock);
             store_data(m, DATA_FILE);
+            pthread_mutex_unlock(&Winthread.lock);
+
             last_save = cur_time;
         }
 
-        if (sig_exit_toxic)
-            exit_toxic_success(m);
-
         usleep(40000);
     }
 

src/windows.c

@@ -105,8 +105,7 @@ void on_nickchange(Tox *m, int32_t friendnumber, const uint8_t *string, uint16_t
             windows[i].onNickChange(&windows[i], m, friendnumber, (const char *) string, length);
     }
 
-    if (store_data(m, DATA_FILE))
-        wprintw(prompt->window, "\nCould not store Tox data\n");
+    store_data(m, DATA_FILE);
 }
 
 void on_statusmessagechange(Tox *m, int32_t friendnumber, const uint8_t *string, uint16_t length, void *userdata)
@@ -138,8 +137,7 @@ void on_friendadded(Tox *m, int32_t friendnumber, bool sort)
             windows[i].onFriendAdded(&windows[i], m, friendnumber, sort);
     }
 
-    if (store_data(m, DATA_FILE))
-        wprintw(prompt->window, "\nCould not store Tox data\n");
+    store_data(m, DATA_FILE);
 }
 
 void on_groupmessage(Tox *m, int groupnumber, int peernumber, const uint8_t *message, uint16_t length,

src/windows.h

@@ -66,6 +66,7 @@ enum {
 struct _Winthread {
     pthread_t tid;
     pthread_mutex_t lock;
+    bool sig_exit_toxic;
     bool flag_resize;
 };