scrcpy/app/src/util/net.c

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#include "net.h"
#include <stdio.h>
#include <SDL2/SDL_platform.h>
#include "log.h"
#ifdef __WINDOWS__
typedef int socklen_t;
#else
# include <sys/types.h>
# include <sys/socket.h>
# include <netinet/in.h>
# include <arpa/inet.h>
# include <unistd.h>
# define SOCKET_ERROR -1
typedef struct sockaddr_in SOCKADDR_IN;
typedef struct sockaddr SOCKADDR;
typedef struct in_addr IN_ADDR;
#endif
static void
net_perror(const char *s) {
#ifdef _WIN32
int error = WSAGetLastError();
char *wsa_message;
FormatMessage(FORMAT_MESSAGE_ALLOCATE_BUFFER | FORMAT_MESSAGE_FROM_SYSTEM,
NULL, error, MAKELANGID(LANG_NEUTRAL, SUBLANG_DEFAULT),
(char *) &wsa_message, 0, NULL);
// no explicit '\n', wsa_message already contains a trailing '\n'
fprintf(stderr, "%s: [%d] %s", s, error, wsa_message);
LocalFree(wsa_message);
#else
perror(s);
#endif
}
socket_t
net_connect(uint32_t addr, uint16_t port) {
socket_t sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET) {
net_perror("socket");
return INVALID_SOCKET;
}
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(addr);
sin.sin_port = htons(port);
if (connect(sock, (SOCKADDR *) &sin, sizeof(sin)) == SOCKET_ERROR) {
net_perror("connect");
net_close(sock);
return INVALID_SOCKET;
}
return sock;
}
socket_t
net_listen(uint32_t addr, uint16_t port, int backlog) {
socket_t sock = socket(AF_INET, SOCK_STREAM, 0);
if (sock == INVALID_SOCKET) {
net_perror("socket");
return INVALID_SOCKET;
}
int reuse = 1;
if (setsockopt(sock, SOL_SOCKET, SO_REUSEADDR, (const void *) &reuse,
sizeof(reuse)) == -1) {
net_perror("setsockopt(SO_REUSEADDR)");
}
SOCKADDR_IN sin;
sin.sin_family = AF_INET;
sin.sin_addr.s_addr = htonl(addr); // htonl() harmless on INADDR_ANY
sin.sin_port = htons(port);
if (bind(sock, (SOCKADDR *) &sin, sizeof(sin)) == SOCKET_ERROR) {
net_perror("bind");
net_close(sock);
return INVALID_SOCKET;
}
if (listen(sock, backlog) == SOCKET_ERROR) {
net_perror("listen");
net_close(sock);
return INVALID_SOCKET;
}
return sock;
}
socket_t
net_accept(socket_t server_socket) {
SOCKADDR_IN csin;
socklen_t sinsize = sizeof(csin);
return accept(server_socket, (SOCKADDR *) &csin, &sinsize);
}
ssize_t
net_recv(socket_t socket, void *buf, size_t len) {
return recv(socket, buf, len, 0);
}
ssize_t
net_recv_all(socket_t socket, void *buf, size_t len) {
return recv(socket, buf, len, MSG_WAITALL);
}
ssize_t
net_send(socket_t socket, const void *buf, size_t len) {
return send(socket, buf, len, 0);
}
ssize_t
net_send_all(socket_t socket, const void *buf, size_t len) {
size_t copied = 0;
while (len > 0) {
ssize_t w = send(socket, buf, len, 0);
if (w == -1) {
return copied ? (ssize_t) copied : -1;
}
len -= w;
buf = (char *) buf + w;
copied += w;
}
return copied;
}
bool
net_shutdown(socket_t socket, int how) {
return !shutdown(socket, how);
}
bool
net_init(void) {
#ifdef __WINDOWS__
WSADATA wsa;
int res = WSAStartup(MAKEWORD(2, 2), &wsa) < 0;
if (res < 0) {
LOGC("WSAStartup failed with error %d", res);
return false;
}
#endif
return true;
}
void
net_cleanup(void) {
#ifdef __WINDOWS__
WSACleanup();
#endif
}
bool
net_close(socket_t socket) {
#ifdef __WINDOWS__
return !closesocket(socket);
#else
return !close(socket);
#endif
}