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Don't crash if the log file can't be opened

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This commit is contained in:
Cameron Gutman 2022-04-16 12:47:33 -05:00
parent 28a5935ee7
commit e9ddf91157
2 changed files with 20 additions and 6 deletions
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2
GS-IPv6-Forwarder

@ -1 +1 @@
Subproject commit 21152240cfbf8c6a35c665575b8b25de7ed36b40
Subproject commit 16ddcb82d94dd99a8bee8887434acd528411773c

24
miss/miss.cpp
View File

@ -11,6 +11,8 @@
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <io.h>
#include <fcntl.h>
#include "relay.h"
#include "..\version.h"
@ -834,15 +836,27 @@ void ResetLogFile(bool standaloneExe)
ExpandEnvironmentStringsA("%ProgramData%\\MISS\\miss-old.log", oldLogFilePath, sizeof(oldLogFilePath));
ExpandEnvironmentStringsA("%ProgramData%\\MISS\\miss-current.log", currentLogFilePath, sizeof(currentLogFilePath));
// Close the existing stdout handle. This is important because otherwise
// it may still be open as stdout when we try to MoveFileEx below.
fclose(stdout);
// Rotate the current to the old log file
MoveFileExA(currentLogFilePath, oldLogFilePath, MOVEFILE_REPLACE_EXISTING);
// Open the new log file
HANDLE newLogHandle = CreateFileA(currentLogFilePath,
GENERIC_WRITE,
FILE_SHARE_READ | FILE_SHARE_DELETE,
nullptr,
CREATE_ALWAYS,
FILE_ATTRIBUTE_NORMAL,
nullptr);
if (newLogHandle == INVALID_HANDLE_VALUE) {
return;
}
// Convert the HANDLE to an fd (transfers ownership too)
int fd = _open_osfhandle((intptr_t)newLogHandle, _O_WRONLY);
// Redirect stdout to this new file
freopen(currentLogFilePath, "w", stdout);
_dup2(fd, _fileno(stdout));
_close(fd);
}
// Print a log header