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Mark sockets as non-inheritable on Windows

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To be able to communicate with a child process via stdin, stdout and
stderr, the CreateProcess() parameter bInheritHandles must be set to
TRUE. But this causes *all* handles to be inherited, including sockets.

One possibility could be to use an extended API to set extra attributes
on process creation:
 - <https://stackoverflow.com/a/28185363/1987178>
 - <https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873>

But it seems that this API is not available on MinGW (it does not
compile).

As an alternative, explicitly mark all sockets as non-inheritable.

Fixes #2779 <https://github.com/Genymobile/scrcpy/issues/2779>
This commit is contained in:
Romain Vimont 2021-11-14 19:41:04 +01:00
commit dcf9887f56
1 changed files with 21 additions and 0 deletions
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21
app/src/util/net.c
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@ -96,6 +96,27 @@ net_perror(const char *s) {
sc_socket sc_socket
net_socket(void) { net_socket(void) {
sc_raw_socket raw_sock = socket(AF_INET, SOCK_STREAM, 0); sc_raw_socket raw_sock = socket(AF_INET, SOCK_STREAM, 0);
#ifdef _WIN32
/* To be able to communicate with a child process via stdin, stdout and
* stderr, the CreateProcess() parameter bInheritHandles must be set to
* TRUE. But this causes *all* handles to be inherited, including sockets.
*
* One possibility could be to use an extended API to set extra attributes
* on process creation:
* - <https://stackoverflow.com/a/28185363/1987178>
* - <https://devblogs.microsoft.com/oldnewthing/20111216-00/?p=8873>
* But it seems that this API is not available on MinGW (it does not
* compile).
*
* As an alternative, explicitly mark all sockets as non-inheritable.
*/
if (!SetHandleInformation((HANDLE) raw_sock, HANDLE_FLAG_INHERIT, 0)) {
closesocket(raw_sock);
return SC_SOCKET_NONE;
}
#endif
sc_socket sock = wrap(raw_sock); sc_socket sock = wrap(raw_sock);
if (sock == SC_SOCKET_NONE) { if (sock == SC_SOCKET_NONE) {
net_perror("socket"); net_perror("socket");