address.h

Go to the documentation of this file.

/* Copyright (c) 2003-2004, Roger Dingledine
 * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
 * Copyright (c) 2007-2017, The Tor Project, Inc. */
/* See LICENSE for licensing information */

#ifndef TOR_ADDRESS_H
#define TOR_ADDRESS_H

//#include <sys/sockio.h>
#include "orconfig.h"
#include "torint.h"
#include "compat.h"
#include "container.h"

#ifdef ADDRESS_PRIVATE

#if defined(HAVE_SYS_IOCTL_H)
#include <sys/ioctl.h>
#endif

#ifdef HAVE_GETIFADDRS
#define HAVE_IFADDRS_TO_SMARTLIST
#endif

#ifdef _WIN32
#define HAVE_IP_ADAPTER_TO_SMARTLIST
#endif

#if defined(SIOCGIFCONF) && defined(HAVE_IOCTL)
#define HAVE_IFCONF_TO_SMARTLIST
#endif

#if defined(HAVE_NET_IF_H)
#include <net/if.h> // for struct ifconf
#endif

#if defined(HAVE_IFADDRS_TO_SMARTLIST)
#include <ifaddrs.h>
#endif

// TODO win32 specific includes
#endif /* defined(ADDRESS_PRIVATE) */

typedef uint8_t maskbits_t;

struct in_addr;
typedef struct tor_addr_t
{
  sa_family_t family;
  union {
    uint32_t dummy_; /* This field is here so we have something to initialize
                      * with a reliable cross-platform type. */
    struct in_addr in_addr;
    struct in6_addr in6_addr;
  } addr;
} tor_addr_t;

typedef struct tor_addr_port_t
{
  tor_addr_t addr;
  uint16_t port;
} tor_addr_port_t;

#define TOR_ADDR_NULL {AF_UNSPEC, {0}}

static inline const struct in6_addr *tor_addr_to_in6(const tor_addr_t *a);
static inline const struct in6_addr *tor_addr_to_in6_assert(
    const tor_addr_t *a);
static inline uint32_t tor_addr_to_ipv4n(const tor_addr_t *a);
static inline uint32_t tor_addr_to_ipv4h(const tor_addr_t *a);
static inline uint32_t tor_addr_to_mapped_ipv4h(const tor_addr_t *a);
static inline sa_family_t tor_addr_family(const tor_addr_t *a);
static inline const struct in_addr *tor_addr_to_in(const tor_addr_t *a);
static inline int tor_addr_eq_ipv4h(const tor_addr_t *a, uint32_t u);

socklen_t tor_addr_to_sockaddr(const tor_addr_t *a, uint16_t port,
                               struct sockaddr *sa_out, socklen_t len);
int tor_addr_from_sockaddr(tor_addr_t *a, const struct sockaddr *sa,
                           uint16_t *port_out);
void tor_addr_make_unspec(tor_addr_t *a);
void tor_addr_make_null(tor_addr_t *a, sa_family_t family);
char *tor_sockaddr_to_str(const struct sockaddr *sa);

static inline const struct in6_addr *
tor_addr_to_in6(const tor_addr_t *a)
{
  return a->family == AF_INET6 ? &a->addr.in6_addr : NULL;
}

static inline const struct in6_addr *
tor_addr_to_in6_assert(const tor_addr_t *a)
{
  tor_assert(a->family == AF_INET6);
  return &a->addr.in6_addr;
}

#define tor_addr_to_in6_addr8(x) tor_addr_to_in6_assert(x)->s6_addr

#define tor_addr_to_in6_addr16(x) S6_ADDR16(*tor_addr_to_in6_assert(x))

#define tor_addr_to_in6_addr32(x) S6_ADDR32(*tor_addr_to_in6_assert(x))

static inline uint32_t
tor_addr_to_ipv4n(const tor_addr_t *a)
{
  return a->family == AF_INET ? a->addr.in_addr.s_addr : 0;
}
static inline uint32_t
tor_addr_to_ipv4h(const tor_addr_t *a)
{
  return ntohl(tor_addr_to_ipv4n(a));
}
static inline uint32_t
tor_addr_to_mapped_ipv4h(const tor_addr_t *a)
{
  if (a->family == AF_INET6) {
    uint32_t *addr32 = NULL;
    // Work around an incorrect NULL pointer dereference warning in
    // "clang --analyze" due to limited analysis depth
    addr32 = tor_addr_to_in6_addr32(a);
    // To improve performance, wrap this assertion in:
    // #if !defined(__clang_analyzer__) || PARANOIA
    tor_assert(addr32);
    return ntohl(addr32[3]);
  } else {
    return 0;
  }
}
static inline sa_family_t
tor_addr_family(const tor_addr_t *a)
{
  return a->family;
}
static inline const struct in_addr *
tor_addr_to_in(const tor_addr_t *a)
{
  return a->family == AF_INET ? &a->addr.in_addr : NULL;
}
static inline int
tor_addr_eq_ipv4h(const tor_addr_t *a, uint32_t u)
{
  return a->family == AF_INET ? (tor_addr_to_ipv4h(a) == u) : 0;
}

#define TOR_ADDR_BUF_LEN 48

MOCK_DECL(int, tor_addr_lookup,(const char *name, uint16_t family,
                                tor_addr_t *addr_out));
char *tor_addr_to_str_dup(const tor_addr_t *addr) ATTR_MALLOC;

#define fmt_addr(a) fmt_addr_impl((a), 0)

#define fmt_and_decorate_addr(a) fmt_addr_impl((a), 1)
const char *fmt_addr_impl(const tor_addr_t *addr, int decorate);
const char *fmt_addrport(const tor_addr_t *addr, uint16_t port);
const char * fmt_addr32(uint32_t addr);

MOCK_DECL(int,get_interface_address6,(int severity, sa_family_t family,
tor_addr_t *addr));
void interface_address6_list_free_(smartlist_t * addrs);// XXXX
#define interface_address6_list_free(addrs) \
  FREE_AND_NULL(smartlist_t, interface_address6_list_free_, (addrs))
MOCK_DECL(smartlist_t *,get_interface_address6_list,(int severity,
                                                     sa_family_t family,
                                                     int include_internal));

typedef enum {
  CMP_EXACT,
  CMP_SEMANTIC,
} tor_addr_comparison_t;

int tor_addr_compare(const tor_addr_t *addr1, const tor_addr_t *addr2,
                     tor_addr_comparison_t how);
int tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2,
                            maskbits_t mask, tor_addr_comparison_t how);
#define tor_addr_eq(a,b) (0==tor_addr_compare((a),(b),CMP_EXACT))

uint64_t tor_addr_hash(const tor_addr_t *addr);
struct sipkey;
uint64_t tor_addr_keyed_hash(const struct sipkey *key, const tor_addr_t *addr);
int tor_addr_is_v4(const tor_addr_t *addr);
int tor_addr_is_internal_(const tor_addr_t *ip, int for_listening,
                          const char *filename, int lineno);
#define tor_addr_is_internal(addr, for_listening) \
  tor_addr_is_internal_((addr), (for_listening), SHORT_FILE__, __LINE__)
int tor_addr_is_multicast(const tor_addr_t *a);

/* 32 nybbles, 32 dots, 8 characters of "ip6.arpa", 1 NUL: 73 characters. */
#define REVERSE_LOOKUP_NAME_BUF_LEN 73
int tor_addr_to_PTR_name(char *out, size_t outlen,
                                    const tor_addr_t *addr);
int tor_addr_parse_PTR_name(tor_addr_t *result, const char *address,
                                       int family, int accept_regular);

int tor_addr_port_lookup(const char *s, tor_addr_t *addr_out,
                        uint16_t *port_out);

/* Does the address * yield an AF_UNSPEC wildcard address (1),
 * which expands to corresponding wildcard IPv4 and IPv6 rules, and do we
 * allow *4 and *6 for IPv4 and IPv6 wildcards, respectively;
 * or does the address * yield IPv4 wildcard address (0).  */
#define TAPMP_EXTENDED_STAR 1
/* Does the address * yield an IPv4 wildcard address rule (1);
 * or does it yield wildcard IPv4 and IPv6 rules (0) */
#define TAPMP_STAR_IPV4_ONLY     (1 << 1)
/* Does the address * yield an IPv6 wildcard address rule (1);
 * or does it yield wildcard IPv4 and IPv6 rules (0) */
#define TAPMP_STAR_IPV6_ONLY     (1 << 2)
/* TAPMP_STAR_IPV4_ONLY and TAPMP_STAR_IPV6_ONLY are mutually exclusive. */
int tor_addr_parse_mask_ports(const char *s, unsigned flags,
                              tor_addr_t *addr_out, maskbits_t *mask_out,
                              uint16_t *port_min_out, uint16_t *port_max_out);
const char * tor_addr_to_str(char *dest, const tor_addr_t *addr, size_t len,
                             int decorate);
int tor_addr_parse(tor_addr_t *addr, const char *src);
void tor_addr_copy(tor_addr_t *dest, const tor_addr_t *src);
void tor_addr_copy_tight(tor_addr_t *dest, const tor_addr_t *src);
void tor_addr_from_ipv4n(tor_addr_t *dest, uint32_t v4addr);
#define tor_addr_from_ipv4h(dest, v4addr)       \
  tor_addr_from_ipv4n((dest), htonl(v4addr))
void tor_addr_from_ipv6_bytes(tor_addr_t *dest, const char *bytes);
#define tor_addr_from_in(dest, in) \
  tor_addr_from_ipv4n((dest), (in)->s_addr);
void tor_addr_from_in6(tor_addr_t *dest, const struct in6_addr *in6);
int tor_addr_is_null(const tor_addr_t *addr);
int tor_addr_is_loopback(const tor_addr_t *addr);

int tor_addr_is_valid(const tor_addr_t *addr, int for_listening);
int tor_addr_is_valid_ipv4n(uint32_t v4n_addr, int for_listening);
#define tor_addr_is_valid_ipv4h(v4h_addr, for_listening) \
        tor_addr_is_valid_ipv4n(htonl(v4h_addr), (for_listening))
int tor_port_is_valid(uint16_t port, int for_listening);
/* Are addr and port both valid? */
#define tor_addr_port_is_valid(addr, port, for_listening) \
        (tor_addr_is_valid((addr), (for_listening)) &&    \
         tor_port_is_valid((port), (for_listening)))
/* Are ap->addr and ap->port both valid? */
#define tor_addr_port_is_valid_ap(ap, for_listening) \
        tor_addr_port_is_valid(&(ap)->addr, (ap)->port, (for_listening))
/* Are the network-order v4addr and port both valid? */
#define tor_addr_port_is_valid_ipv4n(v4n_addr, port, for_listening) \
        (tor_addr_is_valid_ipv4n((v4n_addr), (for_listening)) &&    \
         tor_port_is_valid((port), (for_listening)))
/* Are the host-order v4addr and port both valid? */
#define tor_addr_port_is_valid_ipv4h(v4h_addr, port, for_listening) \
        (tor_addr_is_valid_ipv4h((v4h_addr), (for_listening)) &&    \
         tor_port_is_valid((port), (for_listening)))

int tor_addr_port_split(int severity, const char *addrport,
                        char **address_out, uint16_t *port_out);

int tor_addr_port_parse(int severity, const char *addrport,
                        tor_addr_t *address_out, uint16_t *port_out,
                        int default_port);

int tor_addr_hostname_is_local(const char *name);

/* IPv4 helpers */
int addr_port_lookup(int severity, const char *addrport, char **address,
                    uint32_t *addr, uint16_t *port_out);
int parse_port_range(const char *port, uint16_t *port_min_out,
                     uint16_t *port_max_out);
int addr_mask_get_bits(uint32_t mask);
#define INET_NTOA_BUF_LEN 16
int tor_inet_ntoa(const struct in_addr *in, char *buf, size_t buf_len);
char *tor_dup_ip(uint32_t addr) ATTR_MALLOC;
MOCK_DECL(int,get_interface_address,(int severity, uint32_t *addr));
#define interface_address_list_free(lst)\
  interface_address6_list_free(lst)

static inline smartlist_t *
get_interface_address_list(int severity, int include_internal)
{
  return get_interface_address6_list(severity, AF_INET, include_internal);
}

tor_addr_port_t *tor_addr_port_new(const tor_addr_t *addr, uint16_t port);
int tor_addr_port_eq(const tor_addr_port_t *a,
                     const tor_addr_port_t *b);

#ifdef ADDRESS_PRIVATE
MOCK_DECL(smartlist_t *,get_interface_addresses_raw,(int severity,
                                                     sa_family_t family));
MOCK_DECL(int,get_interface_address6_via_udp_socket_hack,(int severity,
                                                          sa_family_t family,
                                                          tor_addr_t *addr));

#ifdef HAVE_IFADDRS_TO_SMARTLIST
STATIC smartlist_t *ifaddrs_to_smartlist(const struct ifaddrs *ifa,
                                         sa_family_t family);
STATIC smartlist_t *get_interface_addresses_ifaddrs(int severity,
                                                    sa_family_t family);
#endif /* defined(HAVE_IFADDRS_TO_SMARTLIST) */

#ifdef HAVE_IP_ADAPTER_TO_SMARTLIST
STATIC smartlist_t *ip_adapter_addresses_to_smartlist(
                                        const IP_ADAPTER_ADDRESSES *addresses);
STATIC smartlist_t *get_interface_addresses_win32(int severity,
                                                  sa_family_t family);
#endif /* defined(HAVE_IP_ADAPTER_TO_SMARTLIST) */

#ifdef HAVE_IFCONF_TO_SMARTLIST
STATIC smartlist_t *ifreq_to_smartlist(char *ifr,
                                       size_t buflen);
STATIC smartlist_t *get_interface_addresses_ioctl(int severity,
                                                  sa_family_t family);
#endif /* defined(HAVE_IFCONF_TO_SMARTLIST) */

#endif /* defined(ADDRESS_PRIVATE) */

#endif /* !defined(TOR_ADDRESS_H) */