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/* Copyright StrongLoop, Inc. All rights reserved.
*
* Permission is hereby granted, free of charge, to any person obtaining a copy
* of this software and associated documentation files (the "Software"), to
* deal in the Software without restriction, including without limitation the
* rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
* sell copies of the Software, and to permit persons to whom the Software is
* furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included in
* all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*/
#ifndef DEFS_H_
#define DEFS_H_
#include "s5.h"
#include "uv.h"
#include <assert.h>
#include <netinet/in.h> /* sockaddr_in, sockaddr_in6 */
#include <stddef.h> /* size_t, ssize_t */
#include <stdint.h>
#include <sys/socket.h> /* sockaddr */
struct client_ctx;
typedef struct {
const char *bind_host;
unsigned short bind_port;
unsigned int idle_timeout;
} server_config;
typedef struct {
unsigned int idle_timeout; /* Connection idle timeout in ms. */
uv_tcp_t tcp_handle;
uv_loop_t *loop;
} server_ctx;
typedef struct {
unsigned char rdstate;
unsigned char wrstate;
unsigned int idle_timeout;
struct client_ctx *client; /* Backlink to owning client context. */
ssize_t result;
union {
uv_handle_t handle;
uv_stream_t stream;
uv_tcp_t tcp;
uv_udp_t udp;
} handle;
uv_timer_t timer_handle; /* For detecting timeouts. */
uv_write_t write_req;
/* We only need one of these at a time so make them share memory. */
union {
uv_getaddrinfo_t addrinfo_req;
uv_connect_t connect_req;
uv_req_t req;
struct sockaddr_in6 addr6;
struct sockaddr_in addr4;
struct sockaddr addr;
char buf[2048]; /* Scratch space. Used to read data into. */
} t;
} conn;
typedef struct client_ctx {
unsigned int state;
server_ctx *sx; /* Backlink to owning server context. */
s5_ctx parser; /* The SOCKS protocol parser. */
conn incoming; /* Connection with the SOCKS client. */
conn outgoing; /* Connection with upstream. */
} client_ctx;
/* server.c */
int server_run(const server_config *cf, uv_loop_t *loop);
int can_auth_none(const server_ctx *sx, const client_ctx *cx);
int can_auth_passwd(const server_ctx *sx, const client_ctx *cx);
int can_access(const server_ctx *sx,
const client_ctx *cx,
const struct sockaddr *addr);
/* client.c */
void client_finish_init(server_ctx *sx, client_ctx *cx);
/* util.c */
#if defined(__GNUC__)
# define ATTRIBUTE_FORMAT_PRINTF(a, b) __attribute__((format(printf, a, b)))
#else
# define ATTRIBUTE_FORMAT_PRINTF(a, b)
#endif
void pr_info(const char *fmt, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);
void pr_warn(const char *fmt, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);
void pr_err(const char *fmt, ...) ATTRIBUTE_FORMAT_PRINTF(1, 2);
void *xmalloc(size_t size);
/* main.c */
const char *_getprogname(void);
/* getopt.c */
#if !HAVE_UNISTD_H
extern char *optarg;
int getopt(int argc, char **argv, const char *options);
#endif
/* ASSERT() is for debug checks, CHECK() for run-time sanity checks.
* DEBUG_CHECKS is for expensive debug checks that we only want to
* enable in debug builds but still want type-checked by the compiler
* in release builds.
*/
#if defined(NDEBUG)
# define ASSERT(exp)
# define CHECK(exp) do { if (!(exp)) abort(); } while (0)
# define DEBUG_CHECKS (0)
#else
# define ASSERT(exp) assert(exp)
# define CHECK(exp) assert(exp)
# define DEBUG_CHECKS (1)
#endif
#define UNREACHABLE() CHECK(!"Unreachable code reached.")
/* This macro looks complicated but it's not: it calculates the address
* of the embedding struct through the address of the embedded struct.
* In other words, if struct A embeds struct B, then we can obtain
* the address of A by taking the address of B and subtracting the
* field offset of B in A.
*/
#define CONTAINER_OF(ptr, type, field) \
((type *) ((char *) (ptr) - ((char *) &((type *) 0)->field)))
#endif /* DEFS_H_ */
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