diff options
Diffstat (limited to 'src/common/address.c')
| -rw-r--r-- | src/common/address.c | 644 |
1 files changed, 506 insertions, 138 deletions
diff --git a/src/common/address.c b/src/common/address.c index 8591f387e6..793a40effc 100644 --- a/src/common/address.c +++ b/src/common/address.c @@ -1,6 +1,6 @@ /* Copyright (c) 2003-2004, Roger Dingledine * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson. - * Copyright (c) 2007-2013, The Tor Project, Inc. */ + * Copyright (c) 2007-2016, The Tor Project, Inc. */ /* See LICENSE for licensing information */ /** @@ -8,24 +8,41 @@ * \brief Functions to use and manipulate the tor_addr_t structure. **/ +#define ADDRESS_PRIVATE + #include "orconfig.h" -#include "compat.h" -#include "util.h" -#include "address.h" -#include "torlog.h" -#include "container.h" -#include "sandbox.h" #ifdef _WIN32 +/* For access to structs needed by GetAdaptersAddresses */ +#ifndef WIN32_LEAN_AND_MEAN +#error "orconfig.h didn't define WIN32_LEAN_AND_MEAN" +#endif +#ifndef WINVER +#error "orconfig.h didn't define WINVER" +#endif +#ifndef _WIN32_WINNT +#error "orconfig.h didn't define _WIN32_WINNT" +#endif +#if WINVER < 0x0501 +#error "winver too low" +#endif +#if _WIN32_WINNT < 0x0501 +#error "winver too low" +#endif +#include <winsock2.h> #include <process.h> #include <windows.h> -#include <winsock2.h> -/* For access to structs needed by GetAdaptersAddresses */ -#undef _WIN32_WINNT -#define _WIN32_WINNT 0x0501 #include <iphlpapi.h> #endif +#include "compat.h" +#include "util.h" +#include "util_format.h" +#include "address.h" +#include "torlog.h" +#include "container.h" +#include "sandbox.h" + #ifdef HAVE_SYS_TIME_H #include <sys/time.h> #endif @@ -89,13 +106,14 @@ tor_addr_to_sockaddr(const tor_addr_t *a, struct sockaddr *sa_out, socklen_t len) { + memset(sa_out, 0, len); + sa_family_t family = tor_addr_family(a); if (family == AF_INET) { struct sockaddr_in *sin; if (len < (int)sizeof(struct sockaddr_in)) return 0; sin = (struct sockaddr_in *)sa_out; - memset(sin, 0, sizeof(struct sockaddr_in)); #ifdef HAVE_STRUCT_SOCKADDR_IN_SIN_LEN sin->sin_len = sizeof(struct sockaddr_in); #endif @@ -108,7 +126,6 @@ tor_addr_to_sockaddr(const tor_addr_t *a, if (len < (int)sizeof(struct sockaddr_in6)) return 0; sin6 = (struct sockaddr_in6 *)sa_out; - memset(sin6, 0, sizeof(struct sockaddr_in6)); #ifdef HAVE_STRUCT_SOCKADDR_IN6_SIN6_LEN sin6->sin6_len = sizeof(struct sockaddr_in6); #endif @@ -121,14 +138,28 @@ tor_addr_to_sockaddr(const tor_addr_t *a, } } +/** Set address <b>a</b> to zero. This address belongs to + * the AF_UNIX family. */ +static void +tor_addr_make_af_unix(tor_addr_t *a) +{ + memset(a, 0, sizeof(*a)); + a->family = AF_UNIX; +} + /** Set the tor_addr_t in <b>a</b> to contain the socket address contained in - * <b>sa</b>. */ + * <b>sa</b>. IF <b>port_out</b> is non-NULL and <b>sa</b> contains a port, + * set *<b>port_out</b> to that port. Return 0 on success and -1 on + * failure. */ int tor_addr_from_sockaddr(tor_addr_t *a, const struct sockaddr *sa, uint16_t *port_out) { tor_assert(a); tor_assert(sa); + + memset(a, 0, sizeof(*a)); + if (sa->sa_family == AF_INET) { struct sockaddr_in *sin = (struct sockaddr_in *) sa; tor_addr_from_ipv4n(a, sin->sin_addr.s_addr); @@ -139,6 +170,9 @@ tor_addr_from_sockaddr(tor_addr_t *a, const struct sockaddr *sa, tor_addr_from_in6(a, &sin6->sin6_addr); if (port_out) *port_out = ntohs(sin6->sin6_port); + } else if (sa->sa_family == AF_UNIX) { + tor_addr_make_af_unix(a); + return 0; } else { tor_addr_make_unspec(a); return -1; @@ -323,17 +357,23 @@ tor_addr_is_internal_(const tor_addr_t *addr, int for_listening, { uint32_t iph4 = 0; uint32_t iph6[4]; - sa_family_t v_family; tor_assert(addr); - v_family = tor_addr_family(addr); + sa_family_t v_family = tor_addr_family(addr); if (v_family == AF_INET) { iph4 = tor_addr_to_ipv4h(addr); } else if (v_family == AF_INET6) { if (tor_addr_is_v4(addr)) { /* v4-mapped */ + uint32_t *addr32 = NULL; v_family = AF_INET; - iph4 = ntohl(tor_addr_to_in6_addr32(addr)[3]); + // Work around an incorrect NULL pointer dereference warning in + // "clang --analyze" due to limited analysis depth + addr32 = tor_addr_to_in6_addr32(addr); + // To improve performance, wrap this assertion in: + // #if !defined(__clang_analyzer__) || PARANOIA + tor_assert(addr32); + iph4 = ntohl(addr32[3]); } } @@ -412,6 +452,10 @@ tor_addr_to_str(char *dest, const tor_addr_t *addr, size_t len, int decorate) ptr = dest; } break; + case AF_UNIX: + tor_snprintf(dest, len, "AF_UNIX"); + ptr = dest; + break; default: return NULL; } @@ -465,7 +509,6 @@ tor_addr_parse_PTR_name(tor_addr_t *result, const char *address, if (!strcasecmpend(address, ".ip6.arpa")) { const char *cp; - int i; int n0, n1; struct in6_addr in6; @@ -473,7 +516,7 @@ tor_addr_parse_PTR_name(tor_addr_t *result, const char *address, return -1; cp = address; - for (i = 0; i < 16; ++i) { + for (int i = 0; i < 16; ++i) { n0 = hex_decode_digit(*cp++); /* The low-order nybble appears first. */ if (*cp++ != '.') return -1; /* Then a dot. */ n1 = hex_decode_digit(*cp++); /* The high-order nybble appears first. */ @@ -579,13 +622,20 @@ tor_addr_to_PTR_name(char *out, size_t outlen, * yield an IPv4 wildcard. * * If 'flags & TAPMP_EXTENDED_STAR' is true, then the wildcard address '*' - * yields an AF_UNSPEC wildcard address, and the following change is made + * yields an AF_UNSPEC wildcard address, which expands to corresponding + * wildcard IPv4 and IPv6 rules, and the following change is made * in the grammar above: * Address ::= IPv4Address / "[" IPv6Address "]" / "*" / "*4" / "*6" * with the new "*4" and "*6" productions creating a wildcard to match * IPv4 or IPv6 addresses. * - */ + * If 'flags & TAPMP_EXTENDED_STAR' and 'flags & TAPMP_STAR_IPV4_ONLY' are + * both true, then the wildcard address '*' yields an IPv4 wildcard. + * + * If 'flags & TAPMP_EXTENDED_STAR' and 'flags & TAPMP_STAR_IPV6_ONLY' are + * both true, then the wildcard address '*' yields an IPv6 wildcard. + * + * TAPMP_STAR_IPV4_ONLY and TAPMP_STAR_IPV6_ONLY are mutually exclusive. */ int tor_addr_parse_mask_ports(const char *s, unsigned flags, @@ -598,10 +648,14 @@ tor_addr_parse_mask_ports(const char *s, int any_flag=0, v4map=0; sa_family_t family; struct in6_addr in6_tmp; - struct in_addr in_tmp; + struct in_addr in_tmp = { .s_addr = 0 }; tor_assert(s); tor_assert(addr_out); + /* We can either only want an IPv4 address or only want an IPv6 address, + * but we can't only want IPv4 & IPv6 at the same time. */ + tor_assert(!((flags & TAPMP_STAR_IPV4_ONLY) + && (flags & TAPMP_STAR_IPV6_ONLY))); /** Longest possible length for an address, mask, and port-range combination. * Includes IP, [], /mask, :, ports */ @@ -647,8 +701,21 @@ tor_addr_parse_mask_ports(const char *s, if (!strcmp(address, "*")) { if (flags & TAPMP_EXTENDED_STAR) { - family = AF_UNSPEC; - tor_addr_make_unspec(addr_out); + if (flags & TAPMP_STAR_IPV4_ONLY) { + family = AF_INET; + tor_addr_from_ipv4h(addr_out, 0); + } else if (flags & TAPMP_STAR_IPV6_ONLY) { + static char nil_bytes[16] = { [0]=0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }; + family = AF_INET6; + tor_addr_from_ipv6_bytes(addr_out, nil_bytes); + } else { + family = AF_UNSPEC; + tor_addr_make_unspec(addr_out); + log_info(LD_GENERAL, + "'%s' expands into rules which apply to all IPv4 and IPv6 " + "addresses. (Use accept/reject *4:* for IPv4 or " + "accept[6]/reject[6] *6:* for IPv6.)", s); + } } else { family = AF_INET; tor_addr_from_ipv4h(addr_out, 0); @@ -659,7 +726,7 @@ tor_addr_parse_mask_ports(const char *s, tor_addr_from_ipv4h(addr_out, 0); any_flag = 1; } else if (!strcmp(address, "*6") && (flags & TAPMP_EXTENDED_STAR)) { - static char nil_bytes[16] = { 0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }; + static char nil_bytes[16] = { [0]=0,0,0,0, 0,0,0,0, 0,0,0,0, 0,0,0,0 }; family = AF_INET6; tor_addr_from_ipv6_bytes(addr_out, nil_bytes); any_flag = 1; @@ -718,6 +785,11 @@ tor_addr_parse_mask_ports(const char *s, /* XXXX_IP6 is this really what we want? */ bits = 96 + bits%32; /* map v4-mapped masks onto 96-128 bits */ } + if (any_flag) { + log_warn(LD_GENERAL, + "Found bit prefix with wildcard address; rejecting"); + goto err; + } } else { /* pick an appropriate mask, as none was given */ if (any_flag) bits = 0; /* This is okay whether it's V6 or V4 (FIX V4-mapped V6!) */ @@ -803,6 +875,8 @@ tor_addr_is_null(const tor_addr_t *addr) } case AF_INET: return (tor_addr_to_ipv4n(addr) == 0); + case AF_UNIX: + return 1; case AF_UNSPEC: return 1; default: @@ -836,6 +910,59 @@ tor_addr_is_loopback(const tor_addr_t *addr) } } +/* Is addr valid? + * Checks that addr is non-NULL and not tor_addr_is_null(). + * If for_listening is true, IPv4 addr 0.0.0.0 is allowed. + * It means "bind to all addresses on the local machine". */ +int +tor_addr_is_valid(const tor_addr_t *addr, int for_listening) +{ + /* NULL addresses are invalid regardless of for_listening */ + if (addr == NULL) { + return 0; + } + + /* Only allow IPv4 0.0.0.0 for_listening. */ + if (for_listening && addr->family == AF_INET + && tor_addr_to_ipv4h(addr) == 0) { + return 1; + } + + /* Otherwise, the address is valid if it's not tor_addr_is_null() */ + return !tor_addr_is_null(addr); +} + +/* Is the network-order IPv4 address v4n_addr valid? + * Checks that addr is not zero. + * Except if for_listening is true, where IPv4 addr 0.0.0.0 is allowed. */ +int +tor_addr_is_valid_ipv4n(uint32_t v4n_addr, int for_listening) +{ + /* Any IPv4 address is valid with for_listening. */ + if (for_listening) { + return 1; + } + + /* Otherwise, zero addresses are invalid. */ + return v4n_addr != 0; +} + +/* Is port valid? + * Checks that port is not 0. + * Except if for_listening is true, where port 0 is allowed. + * It means "OS chooses a port". */ +int +tor_port_is_valid(uint16_t port, int for_listening) +{ + /* Any port value is valid with for_listening. */ + if (for_listening) { + return 1; + } + + /* Otherwise, zero ports are invalid. */ + return port != 0; +} + /** Set <b>dest</b> to equal the IPv4 address in <b>v4addr</b> (given in * network order). */ void @@ -878,7 +1005,7 @@ tor_addr_copy(tor_addr_t *dest, const tor_addr_t *src) memcpy(dest, src, sizeof(tor_addr_t)); } -/** Copy a tor_addr_t from <b>src</b> to <b>dest</b>, taking extra case to +/** Copy a tor_addr_t from <b>src</b> to <b>dest</b>, taking extra care to * copy only the well-defined portions. Used for computing hashes of * addresses. */ @@ -967,6 +1094,8 @@ tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2, return r; } case AF_INET6: { + if (mbits > 128) + mbits = 128; const uint8_t *a1 = tor_addr_to_in6_addr8(addr1); const uint8_t *a2 = tor_addr_to_in6_addr8(addr2); const int bytes = mbits >> 3; @@ -1013,7 +1142,6 @@ tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2, } else { a2 = tor_addr_to_ipv4h(addr2); } - if (mbits <= 0) return 0; if (mbits > 32) mbits = 32; a1 >>= (32-mbits); a2 >>= (32-mbits); @@ -1109,7 +1237,8 @@ fmt_addr32(uint32_t addr) int tor_addr_parse(tor_addr_t *addr, const char *src) { - char *tmp = NULL; /* Holds substring if we got a dotted quad. */ + /* Holds substring of IPv6 address after removing square brackets */ + char *tmp = NULL; int result; struct in_addr in_tmp; struct in6_addr in6_tmp; @@ -1194,26 +1323,17 @@ typedef ULONG (WINAPI *GetAdaptersAddresses_fn_t)( ULONG, ULONG, PVOID, PIP_ADAPTER_ADDRESSES, PULONG); #endif -/** Try to ask our network interfaces what addresses they are bound to. - * Return a new smartlist of tor_addr_t on success, and NULL on failure. - * (An empty smartlist indicates that we successfully learned that we have no - * addresses.) Log failure messages at <b>severity</b>. */ -static smartlist_t * -get_interface_addresses_raw(int severity) +#ifdef HAVE_IFADDRS_TO_SMARTLIST +/* + * Convert a linked list consisting of <b>ifaddrs</b> structures + * into smartlist of <b>tor_addr_t</b> structures. + */ +STATIC smartlist_t * +ifaddrs_to_smartlist(const struct ifaddrs *ifa, sa_family_t family) { -#if defined(HAVE_GETIFADDRS) - /* Most free Unixy systems provide getifaddrs, which gives us a linked list - * of struct ifaddrs. */ - struct ifaddrs *ifa = NULL; + smartlist_t *result = smartlist_new(); const struct ifaddrs *i; - smartlist_t *result; - if (getifaddrs(&ifa) < 0) { - log_fn(severity, LD_NET, "Unable to call getifaddrs(): %s", - strerror(errno)); - return NULL; - } - result = smartlist_new(); for (i = ifa; i; i = i->ifa_next) { tor_addr_t tmp; if ((i->ifa_flags & (IFF_UP | IFF_RUNNING)) != (IFF_UP | IFF_RUNNING)) @@ -1223,14 +1343,79 @@ get_interface_addresses_raw(int severity) if (i->ifa_addr->sa_family != AF_INET && i->ifa_addr->sa_family != AF_INET6) continue; + if (family != AF_UNSPEC && i->ifa_addr->sa_family != family) + continue; if (tor_addr_from_sockaddr(&tmp, i->ifa_addr, NULL) < 0) continue; smartlist_add(result, tor_memdup(&tmp, sizeof(tmp))); } + return result; +} + +/** Use getiffaddrs() function to get list of current machine + * network interface addresses. Represent the result by smartlist of + * <b>tor_addr_t</b> structures. + */ +STATIC smartlist_t * +get_interface_addresses_ifaddrs(int severity, sa_family_t family) +{ + + /* Most free Unixy systems provide getifaddrs, which gives us a linked list + * of struct ifaddrs. */ + struct ifaddrs *ifa = NULL; + smartlist_t *result; + if (getifaddrs(&ifa) < 0) { + log_fn(severity, LD_NET, "Unable to call getifaddrs(): %s", + strerror(errno)); + return NULL; + } + + result = ifaddrs_to_smartlist(ifa, family); + freeifaddrs(ifa); + + return result; +} +#endif + +#ifdef HAVE_IP_ADAPTER_TO_SMARTLIST + +/** Convert a Windows-specific <b>addresses</b> linked list into smartlist + * of <b>tor_addr_t</b> structures. + */ + +STATIC smartlist_t * +ip_adapter_addresses_to_smartlist(const IP_ADAPTER_ADDRESSES *addresses) +{ + smartlist_t *result = smartlist_new(); + const IP_ADAPTER_ADDRESSES *address; + + for (address = addresses; address; address = address->Next) { + const IP_ADAPTER_UNICAST_ADDRESS *a; + for (a = address->FirstUnicastAddress; a; a = a->Next) { + /* Yes, it's a linked list inside a linked list */ + const struct sockaddr *sa = a->Address.lpSockaddr; + tor_addr_t tmp; + if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) + continue; + if (tor_addr_from_sockaddr(&tmp, sa, NULL) < 0) + continue; + smartlist_add(result, tor_memdup(&tmp, sizeof(tmp))); + } + } + return result; -#elif defined(_WIN32) +} + +/** Windows only: use GetAdaptersInfo() function to retrieve network interface + * addresses of current machine and return them to caller as smartlist of + * <b>tor_addr_t</b> structures. + */ +STATIC smartlist_t * +get_interface_addresses_win32(int severity, sa_family_t family) +{ + /* Windows XP began to provide GetAdaptersAddresses. Windows 2000 had a "GetAdaptersInfo", but that's deprecated; let's just try GetAdaptersAddresses and fall back to connect+getsockname. @@ -1239,7 +1424,7 @@ get_interface_addresses_raw(int severity) smartlist_t *result = NULL; GetAdaptersAddresses_fn_t fn; ULONG size, res; - IP_ADAPTER_ADDRESSES *addresses = NULL, *address; + IP_ADAPTER_ADDRESSES *addresses = NULL; (void) severity; @@ -1262,7 +1447,7 @@ get_interface_addresses_raw(int severity) /* Guess how much space we need. */ size = 15*1024; addresses = tor_malloc(size); - res = fn(AF_UNSPEC, FLAGS, NULL, addresses, &size); + res = fn(family, FLAGS, NULL, addresses, &size); if (res == ERROR_BUFFER_OVERFLOW) { /* we didn't guess that we needed enough space; try again */ tor_free(addresses); @@ -1274,71 +1459,147 @@ get_interface_addresses_raw(int severity) goto done; } - result = smartlist_new(); - for (address = addresses; address; address = address->Next) { - IP_ADAPTER_UNICAST_ADDRESS *a; - for (a = address->FirstUnicastAddress; a; a = a->Next) { - /* Yes, it's a linked list inside a linked list */ - struct sockaddr *sa = a->Address.lpSockaddr; - tor_addr_t tmp; - if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) - continue; - if (tor_addr_from_sockaddr(&tmp, sa, NULL) < 0) - continue; - smartlist_add(result, tor_memdup(&tmp, sizeof(tmp))); - } - } + result = ip_adapter_addresses_to_smartlist(addresses); done: if (lib) FreeLibrary(lib); tor_free(addresses); return result; -#elif defined(SIOCGIFCONF) && defined(HAVE_IOCTL) +} + +#endif + +#ifdef HAVE_IFCONF_TO_SMARTLIST + +/* Guess how much space we need. There shouldn't be any struct ifreqs + * larger than this, even on OS X where the struct's size is dynamic. */ +#define IFREQ_SIZE 4096 + +/* This is defined on Mac OS X */ +#ifndef _SIZEOF_ADDR_IFREQ +#define _SIZEOF_ADDR_IFREQ sizeof +#endif + +/** Convert <b>*buf</b>, an ifreq structure array of size <b>buflen</b>, + * into smartlist of <b>tor_addr_t</b> structures. + */ +STATIC smartlist_t * +ifreq_to_smartlist(char *buf, size_t buflen) +{ + smartlist_t *result = smartlist_new(); + char *end = buf + buflen; + + /* These acrobatics are due to alignment issues which trigger + * undefined behaviour traps on OSX. */ + struct ifreq *r = tor_malloc(IFREQ_SIZE); + + while (buf < end) { + /* Copy up to IFREQ_SIZE bytes into the struct ifreq, but don't overrun + * buf. */ + memcpy(r, buf, end - buf < IFREQ_SIZE ? end - buf : IFREQ_SIZE); + + const struct sockaddr *sa = &r->ifr_addr; + tor_addr_t tmp; + int valid_sa_family = (sa->sa_family == AF_INET || + sa->sa_family == AF_INET6); + + int conversion_success = (tor_addr_from_sockaddr(&tmp, sa, NULL) == 0); + + if (valid_sa_family && conversion_success) + smartlist_add(result, tor_memdup(&tmp, sizeof(tmp))); + + buf += _SIZEOF_ADDR_IFREQ(*r); + } + + tor_free(r); + return result; +} + +/** Use ioctl(.,SIOCGIFCONF,.) to get a list of current machine + * network interface addresses. Represent the result by smartlist of + * <b>tor_addr_t</b> structures. + */ +STATIC smartlist_t * +get_interface_addresses_ioctl(int severity, sa_family_t family) +{ /* Some older unixy systems make us use ioctl(SIOCGIFCONF) */ struct ifconf ifc; - int fd, i, sz, n; + ifc.ifc_buf = NULL; + int fd; smartlist_t *result = NULL; - /* This interface, AFAICT, only supports AF_INET addresses */ - fd = socket(AF_INET, SOCK_DGRAM, 0); + + /* This interface, AFAICT, only supports AF_INET addresses, + * except on AIX. For Solaris, we could use SIOCGLIFCONF. */ + + /* Bail out if family is neither AF_INET nor AF_UNSPEC since + * ioctl() technique supports non-IPv4 interface addresses on + * a small number of niche systems only. If family is AF_UNSPEC, + * fall back to getting AF_INET addresses only. */ + if (family == AF_UNSPEC) + family = AF_INET; + else if (family != AF_INET) + return NULL; + + fd = socket(family, SOCK_DGRAM, 0); if (fd < 0) { tor_log(severity, LD_NET, "socket failed: %s", strerror(errno)); goto done; } - /* Guess how much space we need. */ - ifc.ifc_len = sz = 15*1024; - ifc.ifc_ifcu.ifcu_req = tor_malloc(sz); - if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) { - tor_log(severity, LD_NET, "ioctl failed: %s", strerror(errno)); - close(fd); - goto done; - } - close(fd); - result = smartlist_new(); - if (ifc.ifc_len < sz) - sz = ifc.ifc_len; - n = sz / sizeof(struct ifreq); - for (i = 0; i < n ; ++i) { - struct ifreq *r = &ifc.ifc_ifcu.ifcu_req[i]; - struct sockaddr *sa = &r->ifr_addr; - tor_addr_t tmp; - if (sa->sa_family != AF_INET && sa->sa_family != AF_INET6) - continue; /* should be impossible */ - if (tor_addr_from_sockaddr(&tmp, sa, NULL) < 0) - continue; - smartlist_add(result, tor_memdup(&tmp, sizeof(tmp))); - } + + int mult = 1; + do { + mult *= 2; + ifc.ifc_len = mult * IFREQ_SIZE; + ifc.ifc_buf = tor_realloc(ifc.ifc_buf, ifc.ifc_len); + + tor_assert(ifc.ifc_buf); + + if (ioctl(fd, SIOCGIFCONF, &ifc) < 0) { + tor_log(severity, LD_NET, "ioctl failed: %s", strerror(errno)); + goto done; + } + /* Ensure we have least IFREQ_SIZE bytes unused at the end. Otherwise, we + * don't know if we got everything during ioctl. */ + } while (mult * IFREQ_SIZE - ifc.ifc_len <= IFREQ_SIZE); + result = ifreq_to_smartlist(ifc.ifc_buf, ifc.ifc_len); + done: - tor_free(ifc.ifc_ifcu.ifcu_req); + if (fd >= 0) + close(fd); + tor_free(ifc.ifc_buf); return result; -#else +} +#endif + +/** Try to ask our network interfaces what addresses they are bound to. + * Return a new smartlist of tor_addr_t on success, and NULL on failure. + * (An empty smartlist indicates that we successfully learned that we have no + * addresses.) Log failure messages at <b>severity</b>. Only return the + * interface addresses of requested <b>family</b> and ignore the addresses + * of other address families. */ +MOCK_IMPL(smartlist_t *, +get_interface_addresses_raw,(int severity, sa_family_t family)) +{ + smartlist_t *result = NULL; +#if defined(HAVE_IFADDRS_TO_SMARTLIST) + if ((result = get_interface_addresses_ifaddrs(severity, family))) + return result; +#endif +#if defined(HAVE_IP_ADAPTER_TO_SMARTLIST) + if ((result = get_interface_addresses_win32(severity, family))) + return result; +#endif +#if defined(HAVE_IFCONF_TO_SMARTLIST) + if ((result = get_interface_addresses_ioctl(severity, family))) + return result; +#endif (void) severity; return NULL; -#endif } /** Return true iff <b>a</b> is a multicast address. */ -static int +int tor_addr_is_multicast(const tor_addr_t *a) { sa_family_t family = tor_addr_family(a); @@ -1354,47 +1615,23 @@ tor_addr_is_multicast(const tor_addr_t *a) return 0; } -/** Set *<b>addr</b> to the IP address (if any) of whatever interface - * connects to the Internet. This address should only be used in checking - * whether our address has changed. Return 0 on success, -1 on failure. +/** Attempt to retrieve IP address of current host by utilizing some + * UDP socket trickery. Only look for address of given <b>family</b> + * (only AF_INET and AF_INET6 are supported). Set result to *<b>addr</b>. + * Return 0 on success, -1 on failure. */ -int -get_interface_address6(int severity, sa_family_t family, tor_addr_t *addr) +MOCK_IMPL(int, +get_interface_address6_via_udp_socket_hack,(int severity, + sa_family_t family, + tor_addr_t *addr)) { - /* XXX really, this function should yield a smartlist of addresses. */ - smartlist_t *addrs; - int sock=-1, r=-1; struct sockaddr_storage my_addr, target_addr; + int sock=-1, r=-1; socklen_t addr_len; - tor_assert(addr); - - /* Try to do this the smart way if possible. */ - if ((addrs = get_interface_addresses_raw(severity))) { - int rv = -1; - SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) { - if (family != AF_UNSPEC && family != tor_addr_family(a)) - continue; - if (tor_addr_is_loopback(a) || - tor_addr_is_multicast(a)) - continue; - tor_addr_copy(addr, a); - rv = 0; - - /* If we found a non-internal address, declare success. Otherwise, - * keep looking. */ - if (!tor_addr_is_internal(a, 0)) - break; - } SMARTLIST_FOREACH_END(a); - - SMARTLIST_FOREACH(addrs, tor_addr_t *, a, tor_free(a)); - smartlist_free(addrs); - return rv; - } - - /* Okay, the smart way is out. */ memset(addr, 0, sizeof(tor_addr_t)); memset(&target_addr, 0, sizeof(target_addr)); + /* Don't worry: no packets are sent. We just need to use a real address * on the actual Internet. */ if (family == AF_INET6) { @@ -1416,6 +1653,7 @@ get_interface_address6(int severity, sa_family_t family, tor_addr_t *addr) } else { return -1; } + if (sock < 0) { int e = tor_socket_errno(-1); log_fn(severity, LD_NET, "unable to create socket: %s", @@ -1423,27 +1661,152 @@ get_interface_address6(int severity, sa_family_t family, tor_addr_t *addr) goto err; } - if (connect(sock,(struct sockaddr *)&target_addr, addr_len) < 0) { + if (tor_connect_socket(sock,(struct sockaddr *)&target_addr, + addr_len) < 0) { int e = tor_socket_errno(sock); log_fn(severity, LD_NET, "connect() failed: %s", tor_socket_strerror(e)); goto err; } - if (getsockname(sock,(struct sockaddr*)&my_addr, &addr_len)) { + if (tor_getsockname(sock,(struct sockaddr*)&my_addr, &addr_len)) { int e = tor_socket_errno(sock); log_fn(severity, LD_NET, "getsockname() to determine interface failed: %s", tor_socket_strerror(e)); goto err; } - tor_addr_from_sockaddr(addr, (struct sockaddr*)&my_addr, NULL); - r=0; + if (tor_addr_from_sockaddr(addr, (struct sockaddr*)&my_addr, NULL) == 0) { + if (tor_addr_is_loopback(addr) || tor_addr_is_multicast(addr)) { + log_fn(severity, LD_NET, "Address that we determined via UDP socket" + " magic is unsuitable for public comms."); + } else { + r=0; + } + } + err: if (sock >= 0) tor_close_socket(sock); + if (r == -1) + memset(addr, 0, sizeof(tor_addr_t)); return r; } +/** Set *<b>addr</b> to an arbitrary IP address (if any) of an interface that + * connects to the Internet. Prefer public IP addresses to internal IP + * addresses. This address should only be used in checking whether our + * address has changed, as it may be an internal IP address. Return 0 on + * success, -1 on failure. + * Prefer get_interface_address6_list for a list of all addresses on all + * interfaces which connect to the Internet. + */ +MOCK_IMPL(int, +get_interface_address6,(int severity, sa_family_t family, tor_addr_t *addr)) +{ + smartlist_t *addrs; + int rv = -1; + tor_assert(addr); + + memset(addr, 0, sizeof(tor_addr_t)); + + /* Get a list of public or internal IPs in arbitrary order */ + addrs = get_interface_address6_list(severity, family, 1); + + /* Find the first non-internal address, or the last internal address + * Ideally, we want the default route, see #12377 for details */ + SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) { + tor_addr_copy(addr, a); + rv = 0; + + /* If we found a non-internal address, declare success. Otherwise, + * keep looking. */ + if (!tor_addr_is_internal(a, 0)) + break; + } SMARTLIST_FOREACH_END(a); + + free_interface_address6_list(addrs); + return rv; +} + +/** Free a smartlist of IP addresses returned by get_interface_address6_list. + */ +void +free_interface_address6_list(smartlist_t *addrs) +{ + if (addrs != NULL) { + SMARTLIST_FOREACH(addrs, tor_addr_t *, a, tor_free(a)); + smartlist_free(addrs); + } +} + +/** Return a smartlist of the IP addresses of type family from all interfaces + * on the server. Excludes loopback and multicast addresses. Only includes + * internal addresses if include_internal is true. (Note that a relay behind + * NAT may use an internal address to connect to the Internet.) + * An empty smartlist means that there are no addresses of the selected type + * matching these criteria. + * Returns NULL on failure. + * Use free_interface_address6_list to free the returned list. + */ +MOCK_IMPL(smartlist_t *,get_interface_address6_list,(int severity, + sa_family_t family, + int include_internal)) +{ + smartlist_t *addrs; + tor_addr_t addr; + + /* Try to do this the smart way if possible. */ + if ((addrs = get_interface_addresses_raw(severity, family))) { + SMARTLIST_FOREACH_BEGIN(addrs, tor_addr_t *, a) + { + if (tor_addr_is_loopback(a) || + tor_addr_is_multicast(a)) { + SMARTLIST_DEL_CURRENT(addrs, a); + tor_free(a); + continue; + } + + if (!include_internal && tor_addr_is_internal(a, 0)) { + SMARTLIST_DEL_CURRENT(addrs, a); + tor_free(a); + continue; + } + } SMARTLIST_FOREACH_END(a); + } + + if (addrs && smartlist_len(addrs) > 0) { + return addrs; + } + + /* if we removed all entries as unsuitable */ + if (addrs) { + smartlist_free(addrs); + } + + /* Okay, the smart way is out. */ + addrs = smartlist_new(); + + if (family == AF_INET || family == AF_UNSPEC) { + if (get_interface_address6_via_udp_socket_hack(severity,AF_INET, + &addr) == 0) { + if (include_internal || !tor_addr_is_internal(&addr, 0)) { + smartlist_add(addrs, tor_memdup(&addr, sizeof(addr))); + } + } + } + + if (family == AF_INET6 || family == AF_UNSPEC) { + if (get_interface_address6_via_udp_socket_hack(severity,AF_INET6, + &addr) == 0) { + if (include_internal || !tor_addr_is_internal(&addr, 0)) { + smartlist_add(addrs, tor_memdup(&addr, sizeof(addr))); + } + } + } + + return addrs; +} + /* ====== * IPv4 helpers * XXXX024 IPv6 deprecate some of these. @@ -1497,7 +1860,7 @@ tor_addr_port_parse(int severity, const char *addrport, } /** Given an address of the form "host[:port]", try to divide it into its host - * ane port portions, setting *<b>address_out</b> to a newly allocated string + * and port portions, setting *<b>address_out</b> to a newly allocated string * holding the address portion and *<b>port_out</b> to the port (or 0 if no * port is given). Return 0 on success, -1 on failure. */ int @@ -1683,17 +2046,22 @@ tor_dup_ip(uint32_t addr) } /** - * Set *<b>addr</b> to the host-order IPv4 address (if any) of whatever - * interface connects to the Internet. This address should only be used in - * checking whether our address has changed. Return 0 on success, -1 on - * failure. + * Set *<b>addr</b> to a host-order IPv4 address (if any) of an + * interface that connects to the Internet. Prefer public IP addresses to + * internal IP addresses. This address should only be used in checking + * whether our address has changed, as it may be an internal IPv4 address. + * Return 0 on success, -1 on failure. + * Prefer get_interface_address_list6 for a list of all IPv4 and IPv6 + * addresses on all interfaces which connect to the Internet. */ -int -get_interface_address(int severity, uint32_t *addr) +MOCK_IMPL(int, +get_interface_address,(int severity, uint32_t *addr)) { tor_addr_t local_addr; int r; + memset(addr, 0, sizeof(uint32_t)); + r = get_interface_address6(severity, AF_INET, &local_addr); if (r>=0) *addr = tor_addr_to_ipv4h(&local_addr); |