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#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/un.h>
#include <stddef.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>
#include <stdio.h>
#include <err.h>
#include "tunnel.h"
#include "macro.h"
int tunnel_socket(struct sockaddr **sa, socklen_t *salen)
{
int sock = socket(AF_UNIX, SOCK_SEQPACKET, 0);
if (sock < 0) {
warn("socket");
return -1;
}
struct sockaddr_un sun = {
.sun_family = AF_UNIX
};
const char *path = TUNNEL_SOCK_PATH;
int n = snprintf(sun.sun_path, sizeof(sun.sun_path), "%s", path);
socklen_t len = offsetof(struct sockaddr_un, sun_path) + n + 1;
if (len > sizeof(sun)) {
warnx("too large unix path");
close(sock);
return -1;
}
*sa = _copy(&sun, len);
*salen = len;
return sock;
}
int tunnel_listen(int sock, struct sockaddr *sa, socklen_t salen)
{
if (bind(sock, sa, salen) < 0) {
warn("bind");
return -1;
}
if (listen(sock, 0) < 0) {
warn("listen");
return -1;
}
return 0;
}
int tunnel_server(void)
{
struct sockaddr *sa = NULL;
socklen_t salen = 0;
int sock = tunnel_socket(&sa, &salen);
if (sock < 0)
return -1;
defer {
close(sock);
free(sa);
}
if (tunnel_listen(sock, sa, salen) < 0)
return -1;
if (tunnel_daemon(sock) < 0)
return -1;
return 0;
}
int tunnel_connect(int sock, struct sockaddr *sa, socklen_t salen)
{
if (connect(sock, sa, salen) < 0) {
if (errno == ENOENT) {
if (tunnel_server() < 0)
return -1;
}
if (errno != ENOENT || connect(sock, sa, salen) < 0) {
warn("connect");
return -1;
}
}
return 0;
}
int tunnel_client(void)
{
struct sockaddr *sa = NULL;
socklen_t salen = 0;
int sock = tunnel_socket(&sa, &salen);
if (sock < 0)
return -1;
defer { free(sa); }
if (tunnel_connect(sock, sa, salen) < 0) {
close(sock);
return -1;
}
return sock;
}
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