commit fadb9d2edb3ded8b66e7b2da3182bf78af329339 Author: David Fifield david@bamsoftware.com Date: Thu Feb 20 19:15:17 2014 +0000

Put the "Tor" subdirectory at the head of PATH for DLL access.

Pluggable transport executables are in their own subdirectory, PluggableTransports, but they need to have access to the OpenSSL DLLs. Adding the directory containing the DLLs to PATH makes them visible. I put the directory at the front of PATH and not the end, just in case there is a libeay32.dll or ssleay32.dll somewhere else on the system.

https://trac.torproject.org/projects/tor/ticket/10845 --- RelativeLink/RelativeLink.c | 123 +++++++++++++++++++++++++++++++++++++++++-- 1 file changed, 120 insertions(+), 3 deletions(-)

diff --git a/RelativeLink/RelativeLink.c b/RelativeLink/RelativeLink.c index bae4647..9a6c9f5 100755 --- a/RelativeLink/RelativeLink.c +++ b/RelativeLink/RelativeLink.c @@ -1,4 +1,6 @@ #include <windows.h> +#include <stdio.h> +#include <tchar.h>

// // RelativeLink.c @@ -22,8 +24,119 @@ // Put it in the proper place. //

-int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) +// Get the absolute path to a subdirectory of the current directory; i.e. +// "C:\cwd\reldir". Returns a malloc-allocated string or NULL on error. +LPTSTR GetSubdirectory(LPCTSTR reldir) +{ + DWORD bufsize, n; + int len; + LPTSTR cwd, subdir; + + cwd = NULL; + subdir = NULL; + + // The first call to GetCurrentDirectory gets the buffer size; the second + // fills the buffer. + bufsize = GetCurrentDirectory(0, NULL); + if (bufsize == 0) + goto bail; + cwd = (LPTSTR) malloc(bufsize * sizeof(TCHAR)); + if (cwd == NULL) + goto bail; + n = GetCurrentDirectory(bufsize, cwd); + if (n == 0 || n >= bufsize) + goto bail; + + bufsize = _tcslen(cwd) + 1 + _tcslen(reldir) + 1; + subdir = (LPTSTR) malloc(bufsize * sizeof(TCHAR)); + if (subdir == NULL) + goto bail; + len = _sntprintf(subdir, bufsize, "%s\%s", cwd, reldir); + if (len < 0 || (DWORD) len >= bufsize) + goto bail; + + free(cwd); + return subdir; + +bail: + if (cwd != NULL) + free(cwd); + if (subdir != NULL) + free(subdir); + return NULL; +} + +// Add a directory to the beginning of the PATH environment variable. Returns 0 +// on failure, nonzero on success. +// http://msdn.microsoft.com/en-us/library/windows/desktop/ms682009%28v=vs.85%2... +DWORD PrependToPath(LPCTSTR dir) +{ + DWORD bufsize, n, rc, err; + int len; + LPTSTR path, value; + + path = NULL; + value = NULL; + + // First find out how big a buffer we need. + bufsize = GetEnvironmentVariable(TEXT ("PATH"), NULL, 0); + if (bufsize == 0) + { + err = GetLastError(); + if (err == ERROR_ENVVAR_NOT_FOUND) + // If the variable doesn't yet exist, just set it and return. + return SetEnvironmentVariable(TEXT ("PATH"), dir); + else + goto bail; + } + // Now that we know the buffer size, get the value. + path = (LPTSTR) malloc(bufsize * sizeof(TCHAR)); + if (path == NULL) + goto bail; + n = GetEnvironmentVariable(TEXT ("PATH"), path, bufsize); + if (n == 0 || n >= bufsize) + goto bail; + + bufsize = _tcslen(dir) + 1 + _tcslen(path) + 1; + value = (LPTSTR) malloc(bufsize * sizeof(TCHAR)); + if (value == NULL) + goto bail; + len = _sntprintf(value, bufsize, "%s;%s", dir, path); + if (len < 0 || (DWORD) len >= bufsize) + goto bail; + + rc = SetEnvironmentVariable(TEXT ("PATH"), value); + if (rc == 0) + goto bail; + + free(path); + free(value); + return 1; + +bail: + if (path != NULL) + free(path); + if (value != NULL) + free(value); + return 0; +} + +// Returns 0 on failure and nonzero on success. +DWORD StartTorBrowser(void) { + TCHAR *TorDir; + DWORD rc; + // Put the Tor subdirectory at the beginning of PATH so that pluggable + // transports (in their own subdirectory) can access DLLs. + // https://trac.torproject.org/projects/tor/ticket/10845 + TorDir = GetSubdirectory(TEXT ("Tor")); + if (TorDir == NULL) + return 0; + rc = PrependToPath(TorDir); + free(TorDir); + if (rc == 0) + return 0; + STARTUPINFO si; PROCESS_INFORMATION pi;

@@ -34,8 +147,12 @@ int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine TCHAR *ProgramToStart; ProgramToStart = TEXT ("Browser\firefox.exe -no-remote -profile .\Data\Browser\profile.default\");

- if( !CreateProcess( - NULL, ProgramToStart, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi )) + return CreateProcess( NULL, ProgramToStart, NULL, NULL, FALSE, 0, NULL, NULL, &si, &pi ); +} + +int WINAPI WinMain(HINSTANCE hInstance, HINSTANCE hPrevInstance, LPSTR lpCmdLine, int nCmdShow) +{ + if (!StartTorBrowser()) { MessageBox ( NULL, TEXT ("Unable to start Tor Browser"), NULL, MB_OK); return -1;