common.txt

关于tor匿名通信的源代码

{
  union {
    uint8_t u6_addr8[16];
    uint16_t u6_addr16[8];
    uint32_t u6_addr32[4];
  } in6_u;
#define s6_addr   in6_u.u6_addr8
#define s6_addr16 in6_u.u6_addr16
#define s6_addr32 in6_u.u6_addr32
};
#endif

#if defined(__APPLE__) || defined(__darwin__) || defined(__FreeBSD__) \
    || defined(__NetBSD__) || defined(__OpenBSD__)
/* Many BSD variants seem not to define these. */
#ifndef s6_addr16
#define s6_addr16 __u6_addr.__u6_addr16
#endif
#ifndef s6_addr32
#define s6_addr32 __u6_addr.__u6_addr32
#endif
#endif

#ifndef HAVE_SA_FAMILY_T
typedef uint16_t sa_family_t;
#endif

/* Apparently, MS and Solaris don't define s6_addr16 or s6_addr32. */
#ifdef HAVE_STRUCT_IN6_ADDR_S6_ADDR32
#define S6_ADDR32(x) ((uint32_t*)(x).s6_addr32)
#else
#define S6_ADDR32(x) ((uint32_t*)((char*)&(x).s6_addr))
#endif
#ifdef HAVE_STRUCT_IN6_ADDR_S6_ADDR16
#define S6_ADDR16(x) ((uint16_t*)(x).s6_addr16)
#else
#define S6_ADDR16(x) ((uint16_t*)((char*)&(x).s6_addr))
#endif

/* Define struct sockaddr_in6 on platforms that do not have it. See notes
 * on struct in6_addr. */
#if !defined(HAVE_STRUCT_SOCKADDR_IN6)
struct sockaddr_in6 {
  sa_family_t sin6_family;
  uint16_t sin6_port;
  // uint32_t sin6_flowinfo;
  struct in6_addr sin6_addr;
  // uint32_t sin6_scope_id;
};
#endif

typedef uint8_t maskbits_t;
struct in_addr;
/** Holds an IPv4 or IPv6 address.  (Uses less memory than struct
 * sockaddr_storage.) */
typedef struct tor_addr_t
{
  sa_family_t family;
  union {
    struct in_addr in_addr;
    struct in6_addr in6_addr;
  } addr;
} tor_addr_t;

/* XXXX021 rename these. */
static INLINE uint32_t IPV4IP(const tor_addr_t *a);
static INLINE uint32_t IPV4IPh(const tor_addr_t *a);
static INLINE uint32_t IPV4MAPh(const tor_addr_t *a);
static INLINE uint16_t IN_FAMILY(const tor_addr_t *a);
static INLINE const struct in_addr *IN4_ADDRESS(const tor_addr_t *a);
static INLINE const struct in6_addr *IN6_ADDRESS(const tor_addr_t *a);

static INLINE const struct in6_addr *
IN6_ADDRESS(const tor_addr_t *a)
{
  return &a->addr.in6_addr;
}

#define IN6_ADDRESS16(x) S6_ADDR16(*IN6_ADDRESS(x))
#define IN6_ADDRESS32(x) S6_ADDR32(*IN6_ADDRESS(x))

static INLINE uint32_t
IPV4IP(const tor_addr_t *a)
{
  return a->addr.in_addr.s_addr;
}
static INLINE uint32_t IPV4IPh(const tor_addr_t *a)
{
  return ntohl(IPV4IP(a));
}
static INLINE uint32_t
IPV4MAPh(const tor_addr_t *a)
{
  return ntohl(IN6_ADDRESS32(a)[3]);
}
static INLINE uint16_t
IN_FAMILY(const tor_addr_t *a)
{
  return a->family;
}
static INLINE const struct in_addr *
IN4_ADDRESS(const tor_addr_t *a)
{
  return &a->addr.in_addr;
}

#define INET_NTOA_BUF_LEN 16 /* 255.255.255.255 */
#define TOR_ADDR_BUF_LEN 46 /* ffff:ffff:ffff:ffff:ffff:ffff:255.255.255.255 */

int tor_inet_aton(const char *cp, struct in_addr *addr) ATTR_NONNULL((1,2));
const char *tor_inet_ntop(int af, const void *src, char *dst, size_t len);
int tor_inet_pton(int af, const char *src, void *dst);
int tor_lookup_hostname(const char *name, uint32_t *addr) ATTR_NONNULL((1,2));
void set_socket_nonblocking(int socket);
int tor_socketpair(int family, int type, int protocol, int fd[2]);
int network_init(void);

int tor_addr_lookup(const char *name, uint16_t family, tor_addr_t *addr_out);

/* For stupid historical reasons, windows sockets have an independent
 * set of errnos, and an independent way to get them.  Also, you can't
 * always believe WSAEWOULDBLOCK.  Use the macros below to compare
 * errnos against expected values, and use tor_socket_errno to find
 * the actual errno after a socket operation fails.
 */
#if defined(MS_WINDOWS) && !defined(USE_BSOCKETS)
/** Return true if e is EAGAIN or the local equivalent. */
#define ERRNO_IS_EAGAIN(e)           ((e) == EAGAIN || (e) == WSAEWOULDBLOCK)
/** Return true if e is EINPROGRESS or the local equivalent. */
#define ERRNO_IS_EINPROGRESS(e)      ((e) == WSAEINPROGRESS)
/** Return true if e is EINPROGRESS or the local equivalent as returned by
 * a call to connect(). */
#define ERRNO_IS_CONN_EINPROGRESS(e) \
  ((e) == WSAEINPROGRESS || (e)== WSAEINVAL || (e) == WSAEWOULDBLOCK)
/** Return true if e is EAGAIN or another error indicating that a call to
 * accept() has no pending connections to return. */
#define ERRNO_IS_ACCEPT_EAGAIN(e)    ERRNO_IS_EAGAIN(e)
/** Return true if e is EMFILE or another error indicating that a call to
 * accept() has failed because we're out of fds or something. */
#define ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e) \
  ((e) == WSAEMFILE || (e) == WSAENOBUFS)
/** Return true if e is EADDRINUSE or the local equivalent. */
#define ERRNO_IS_EADDRINUSE(e)      ((e) == WSAEADDRINUSE)
int tor_socket_errno(int sock);
const char *tor_socket_strerror(int e);
#else
#define ERRNO_IS_EAGAIN(e)           ((e) == EAGAIN)
#define ERRNO_IS_EINPROGRESS(e)      ((e) == EINPROGRESS)
#define ERRNO_IS_CONN_EINPROGRESS(e) ((e) == EINPROGRESS)
#define ERRNO_IS_ACCEPT_EAGAIN(e)    ((e) == EAGAIN || (e) == ECONNABORTED)
#define ERRNO_IS_ACCEPT_RESOURCE_LIMIT(e) \
  ((e) == EMFILE || (e) == ENFILE || (e) == ENOBUFS || (e) == ENOMEM)
#define ERRNO_IS_EADDRINUSE(e)       ((e) == EADDRINUSE)
#define tor_socket_errno(sock)       (errno)
#define tor_socket_strerror(e)       strerror(e)
#endif

/* ===== OS compatibility */
const char *get_uname(void);

uint16_t get_uint16(const char *cp) ATTR_PURE ATTR_NONNULL((1));
uint32_t get_uint32(const char *cp) ATTR_PURE ATTR_NONNULL((1));
void set_uint16(char *cp, uint16_t v) ATTR_NONNULL((1));
void set_uint32(char *cp, uint32_t v) ATTR_NONNULL((1));

#if !defined(HAVE_RLIM_T)
typedef unsigned long rlim_t;
#endif
int set_max_file_descriptors(rlim_t limit, int *max);
int switch_id(const char *user, const char *group);
#ifdef HAVE_PWD_H
char *get_user_homedir(const char *username);
#endif

int spawn_func(void (*func)(void *), void *data);
void spawn_exit(void) ATTR_NORETURN;

#if defined(ENABLE_THREADS) && defined(MS_WINDOWS)
#define USE_WIN32_THREADS
#define TOR_IS_MULTITHREADED 1
#elif (defined(ENABLE_THREADS) && defined(HAVE_PTHREAD_H) && \
       defined(HAVE_PTHREAD_CREATE))
#define USE_PTHREADS
#define TOR_IS_MULTITHREADED 1
#else
#undef TOR_IS_MULTITHREADED
#endif

/* Because we use threads instead of processes on most platforms (Windows,
 * Linux, etc), we need locking for them.  On platforms with poor thread
 * support or broken gethostbyname_r, these functions are no-ops. */

typedef struct tor_mutex_t tor_mutex_t;
#ifdef TOR_IS_MULTITHREADED
tor_mutex_t *tor_mutex_new(void);
void tor_mutex_acquire(tor_mutex_t *m);
void tor_mutex_release(tor_mutex_t *m);
void tor_mutex_free(tor_mutex_t *m);
unsigned long tor_get_thread_id(void);
void tor_threads_init(void);
#else
#define tor_mutex_new() ((tor_mutex_t*)tor_malloc(sizeof(int)))
#define tor_mutex_acquire(m) STMT_NIL
#define tor_mutex_release(m) STMT_NIL
#define tor_mutex_free(m) STMT_BEGIN tor_free(m); STMT_END
#define tor_get_thread_id() (1UL)
#define tor_threads_init() STMT_NIL
#endif

#ifdef TOR_IS_MULTITHREADED
#if 0
typedef struct tor_cond_t tor_cond_t;
tor_cond_t *tor_cond_new(void);
void tor_cond_free(tor_cond_t *cond);
int tor_cond_wait(tor_cond_t *cond, tor_mutex_t *mutex);
void tor_cond_signal_one(tor_cond_t *cond);
void tor_cond_signal_all(tor_cond_t *cond);
#endif
#endif

/* Platform-specific helpers. */
#ifdef MS_WINDOWS
char *format_win32_error(DWORD err);
#endif

/*for some reason my compiler doesn't have these version flags defined
  a nice homework assignment for someone one day is to define the rest*/
//these are the values as given on MSDN
#ifdef MS_WINDOWS

#ifndef VER_SUITE_EMBEDDEDNT
#define VER_SUITE_EMBEDDEDNT 0x00000040
#endif

#ifndef VER_SUITE_SINGLEUSERTS
#define VER_SUITE_SINGLEUSERTS 0x00000100
#endif

#endif

#endif

















/* Copyright (c) 2003-2004, Roger Dingledine
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2008, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/* $Id$ */
const char compat_c_id[] =
  "$Id$";

/**
 * \file compat.c
 * \brief Wrappers to make calls more portable.  This code defines
 * functions such as tor_malloc, tor_snprintf, get/set various data types,
 * renaming, setting socket options, switching user IDs.  It is basically
 * where the non-portable items are conditionally included depending on
 * the platform.
 **/

/* This is required on rh7 to make strptime not complain.
 * We also need it to make memmem get defined (where available)
 */
#define _GNU_SOURCE

#include "orconfig.h"
#include "compat.h"

#ifdef MS_WINDOWS
#include <process.h>
#include <windows.h>
#endif

#ifdef HAVE_UNAME
#include <sys/utsname.h>
#endif
#ifdef HAVE_SYS_TIME_H
#include <sys/time.h>
#endif
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
#ifdef HAVE_SYS_FCNTL_H
#include <sys/fcntl.h>
#endif
#ifdef HAVE_PWD_H
#include <pwd.h>
#endif
#ifdef HAVE_GRP_H
#include <grp.h>
#endif
#ifdef HAVE_FCNTL_H
#include <fcntl.h>
#endif
#ifdef HAVE_SYS_RESOURCE_H
#include <sys/resource.h>
#endif
#ifdef HAVE_ERRNO_H
#include <errno.h>
#endif
#ifdef HAVE_NETINET_IN_H
#include <netinet/in.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#ifndef HAVE_GETTIMEOFDAY
#ifdef HAVE_FTIME
#include <sys/timeb.h>
#endif
#endif
#ifdef HAVE_SYS_SOCKET_H
#include <sys/socket.h>
#endif
#ifdef HAVE_NETDB_H
#include <netdb.h>
#endif
#ifdef HAVE_SYS_PARAM_H
#include <sys/param.h> /* FreeBSD needs this to know what version it is */
#endif
#include <stdarg.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <assert.h>
#ifdef HAVE_PTHREAD_H
#include <pthread.h>
#endif
#ifdef HAVE_SIGNAL_H
#include <signal.h>
#endif
#ifdef HAVE_UTIME_H
#include <utime.h>
#endif
#ifdef HAVE_SYS_UTIME_H
#include <sys/utime.h>
#endif