fix

anet.c

@@ -51,7 +51,6 @@
  * POSSIBILITY OF SUCH DAMAGE.
  */
 
-#include <sys/types.h>
 #ifdef _WIN32
 #  include <winsock2.h>
 #  include <ws2def.h>
@@ -70,6 +69,7 @@
 #  include <netdb.h>
 #  define p_setsockopt_optval_t void*
 #endif
+#include <sys/types.h>
 #include <sys/stat.h>
 #include <fcntl.h>
 #include <string.h>

dump1090.h

@@ -61,6 +61,13 @@
 
 // ============================= Include files ==========================
 
+#ifdef _WIN32
+//WinSocks2 must be included before Windows.h
+#  include <winsock2.h>
+#else
+#  include <sys/ioctl.h>
+#endif
+
 #include <stdio.h>
 #include <string.h>
 #include <stdlib.h>
@@ -76,11 +83,6 @@
 #include <fcntl.h>
 #include <ctype.h>
 #include <sys/stat.h>
-#ifdef _WIN32
-#  include <winsock.h>
-#else
-#  include <sys/ioctl.h>
-#endif
 #include <string.h>
 #include <time.h>
 #include <limits.h>

net_io.c

@@ -2105,6 +2105,30 @@ static bool UtilMoveFile(const char *fromPath, const char *toPath)
 #endif
 }
 
+static bool UtilCreateWritableTempFile(char* outPathBuffer, const char* prefix, const char* path)
+{
+#ifdef _WIN32
+    if (GetTempFileNameA(path, prefix, 0, outPathBuffer) == 0) {
+        return false;
+    }
+#else
+    int unix_fd = 0;
+    mode_t mask = 0;
+
+    snprintf(outPathBuffer, PATH_MAX, "%s/%sXXXXXX", path, prefix);
+    unix_fd = mkstemp(outPathBuffer);
+    if (unix_fd < 0) {
+        return NULL;
+    }
+
+    mask = umask(0);
+    umask(mask);
+    fchmod(unix_fd, 0644 & ~mask);
+#endif
+
+    return true;
+}
+
 // Write JSON to file
 void writeJsonToFile(const char *file, char * (*generator) (const char *,int*))
 {
@@ -2117,33 +2141,13 @@ void writeJsonToFile(const char *file, char * (*generator) (const char *,int*))
     if (!Modes.json_dir)
         return;
 
-#ifdef _WIN32
-    if (GetTempFileNameA(Modes.json_dir, file, 0, tmppath) == 0) {
+    if(!UtilCreateWritableTempFile(tmppath, file, Modes.json_dir) ||
+        (fd = fopen(tmppath, "wb")) == NULL) {
+        //TODO: implement a function to get the last error on windows and linux as a string
         ratelimitWriteError("failed to create %s (while updating %s/%s): %s", tmppath, Modes.json_dir, file, strerror(errno));
-        return;
     }
 
-    fd = fopen(tmppath, "wb");
-#else
-    int unix_fd = 0;
-    mode_t mask = 0;
-    snprintf(tmppath, PATH_MAX, "%s/%sXXXXXX", Modes.json_dir, file);
-    tmppath[PATH_MAX - 1] = 0;
-    unix_fd = mkstemp(tmppath);
-    if (unix_fd < 0) {
-        ratelimitWriteError("failed to create %s (while updating %s/%s): %s", tmppath, Modes.json_dir, file, strerror(errno));
-        return;
-    }
-
-    mask = umask(0);
-    umask(mask);
-    fchmod(unix_fd, 0644 & ~mask);
-    fd = fdopen(unix_fd, "wb");
-#endif
-
     snprintf(pathbuf, PATH_MAX, "/data/%s", file);
-    pathbuf[PATH_MAX - 1] = 0;
-
     content = generator(pathbuf, (int*)&len);
 
     if (fwrite(content, 1, len, fd) != len || fclose(fd) != 0)
@@ -2156,8 +2160,6 @@ void writeJsonToFile(const char *file, char * (*generator) (const char *,int*))
     }
 
     snprintf(pathbuf, PATH_MAX, "%s/%s", Modes.json_dir, file);
-    pathbuf[PATH_MAX - 1] = 0;
-
     if(!UtilMoveFile(tmppath, pathbuf)){
         ratelimitWriteError("failed to rename %s to %s: %s", tmppath, pathbuf, strerror(errno));
     }