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Replace SDL_net by custom implementation

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SDL_net is not very suitable for scrcpy.

For example, SDLNet_TCP_Accept() is non-blocking, so we have to wrap it
by calling many SDL_Net-specific functions to make it blocking.

But above all, SDLNet_TCP_Open() is a server socket only when no IP is
provided; otherwise, it's a client socket. Therefore, it is not possible
to create a server socket bound to localhost, so it accepts connections
from anywhere.

This is a problem for scrcpy, because on start, the application listens
for nearly 1 second until it accepts the first connection, supposedly
from the device. If someone on the local network manages to connect to
the server socket first, then they can stream arbitrary H.264 video.
This may be troublesome, for example during a public presentation ;-)

Provide our own simplified API (net.h) instead, implemented for the
different platforms.
This commit is contained in:
Romain Vimont 2018-02-15 22:59:21 +01:00
commit 9b056f5091
18 changed files with 178 additions and 95 deletions
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4
app/src/controller.c
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@ -3,7 +3,7 @@
#include "lockutil.h"
#include "log.h"
SDL_bool controller_init(struct controller *controller, TCPsocket video_socket) {
SDL_bool controller_init(struct controller *controller, socket_t video_socket) {
if (!control_event_queue_init(&controller->queue)) {
return SDL_FALSE;
}
@ -47,7 +47,7 @@ static SDL_bool process_event(struct controller *controller, const struct contro
if (!length) {
return SDL_FALSE;
}
int w = SDLNet_TCP_Send(controller->video_socket, serialized_event, length);
int w = net_send(controller->video_socket, serialized_event, length);
return w == length;
}