address.c
上传用户:awang829
上传日期:2019-07-14
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文件大小:39k
- /* Copyright (c) 2003-2004, Roger Dingledine
- * Copyright (c) 2004-2006, Roger Dingledine, Nick Mathewson.
- * Copyright (c) 2007-2009, The Tor Project, Inc. */
- /* See LICENSE for licensing information */
- /**
- * file address.c
- * brief Functions to use and manipulate the tor_addr_t structure.
- **/
- #include "orconfig.h"
- #include "compat.h"
- #include "util.h"
- #include "address.h"
- #include "log.h"
- #ifdef MS_WINDOWS
- #include <process.h>
- #include <windows.h>
- #endif
- #ifdef HAVE_SYS_TIME_H
- #include <sys/time.h>
- #endif
- #ifdef HAVE_UNISTD_H
- #include <unistd.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
- #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>
- /** Convert the tor_addr_t in <b>a</b>, with port in <b>port</b>, into a
- * socklen object in *<b>sa_out</b> of object size <b>len</b>. If not enough
- * room is free, or on error, return -1. Else return the length of the
- * sockaddr. */
- /* XXXX021 This returns socklen_t. socklen_t is sometimes unsigned. This
- * function claims to return -1 sometimes. Problematic! */
- socklen_t
- tor_addr_to_sockaddr(const tor_addr_t *a,
- uint16_t port,
- struct sockaddr *sa_out,
- socklen_t 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 -1;
- 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
- sin->sin_family = AF_INET;
- sin->sin_port = htons(port);
- sin->sin_addr.s_addr = tor_addr_to_ipv4n(a);
- return sizeof(struct sockaddr_in);
- } else if (family == AF_INET6) {
- struct sockaddr_in6 *sin6;
- if (len < (int)sizeof(struct sockaddr_in6))
- return -1;
- 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
- sin6->sin6_family = AF_INET6;
- sin6->sin6_port = htons(port);
- memcpy(&sin6->sin6_addr, tor_addr_to_in6(a), sizeof(struct in6_addr));
- return sizeof(struct sockaddr_in6);
- } else {
- return -1;
- }
- }
- /** Set the tor_addr_t in <b>a</b> to contain the socket address contained in
- * <b>sa</b>. */
- int
- tor_addr_from_sockaddr(tor_addr_t *a, const struct sockaddr *sa,
- uint16_t *port_out)
- {
- tor_assert(a);
- tor_assert(sa);
- if (sa->sa_family == AF_INET) {
- struct sockaddr_in *sin = (struct sockaddr_in *) sa;
- tor_addr_from_ipv4n(a, sin->sin_addr.s_addr);
- if (port_out)
- *port_out = ntohs(sin->sin_port);
- } else if (sa->sa_family == AF_INET6) {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6 *) sa;
- tor_addr_from_in6(a, &sin6->sin6_addr);
- if (port_out)
- *port_out = ntohs(sin6->sin6_port);
- } else {
- tor_addr_make_unspec(a);
- return -1;
- }
- return 0;
- }
- /** Set address <b>a</b> to the unspecified address. This address belongs to
- * no family. */
- void
- tor_addr_make_unspec(tor_addr_t *a)
- {
- memset(a, 0, sizeof(*a));
- a->family = AF_UNSPEC;
- }
- /** Similar behavior to Unix gethostbyname: resolve <b>name</b>, and set
- * *<b>addr</b> to the proper IP address and family. The <b>family</b>
- * argument (which must be AF_INET, AF_INET6, or AF_UNSPEC) declares a
- * <i>preferred</i> family, though another one may be returned if only one
- * family is implemented for this address.
- *
- * Return 0 on success, -1 on failure; 1 on transient failure.
- */
- int
- tor_addr_lookup(const char *name, uint16_t family, tor_addr_t *addr)
- {
- /* Perhaps eventually this should be replaced by a tor_getaddrinfo or
- * something.
- */
- struct in_addr iaddr;
- struct in6_addr iaddr6;
- tor_assert(name);
- tor_assert(addr);
- tor_assert(family == AF_INET || family == AF_INET6 || family == AF_UNSPEC);
- if (!*name) {
- /* Empty address is an error. */
- return -1;
- } else if (tor_inet_pton(AF_INET, name, &iaddr)) {
- /* It's an IPv4 IP. */
- if (family == AF_INET6)
- return -1;
- tor_addr_from_in(addr, &iaddr);
- return 0;
- } else if (tor_inet_pton(AF_INET6, name, &iaddr6)) {
- if (family == AF_INET)
- return -1;
- tor_addr_from_in6(addr, &iaddr6);
- return 0;
- } else {
- #ifdef HAVE_GETADDRINFO
- int err;
- struct addrinfo *res=NULL, *res_p;
- struct addrinfo *best=NULL;
- struct addrinfo hints;
- int result = -1;
- memset(&hints, 0, sizeof(hints));
- hints.ai_family = family;
- hints.ai_socktype = SOCK_STREAM;
- err = getaddrinfo(name, NULL, &hints, &res);
- if (!err) {
- best = NULL;
- for (res_p = res; res_p; res_p = res_p->ai_next) {
- if (family == AF_UNSPEC) {
- if (res_p->ai_family == AF_INET) {
- best = res_p;
- break;
- } else if (res_p->ai_family == AF_INET6 && !best) {
- best = res_p;
- }
- } else if (family == res_p->ai_family) {
- best = res_p;
- break;
- }
- }
- if (!best)
- best = res;
- if (best->ai_family == AF_INET) {
- tor_addr_from_in(addr,
- &((struct sockaddr_in*)best->ai_addr)->sin_addr);
- result = 0;
- } else if (best->ai_family == AF_INET6) {
- tor_addr_from_in6(addr,
- &((struct sockaddr_in6*)best->ai_addr)->sin6_addr);
- result = 0;
- }
- freeaddrinfo(res);
- return result;
- }
- return (err == EAI_AGAIN) ? 1 : -1;
- #else
- struct hostent *ent;
- int err;
- #ifdef HAVE_GETHOSTBYNAME_R_6_ARG
- char buf[2048];
- struct hostent hostent;
- int r;
- r = gethostbyname_r(name, &hostent, buf, sizeof(buf), &ent, &err);
- #elif defined(HAVE_GETHOSTBYNAME_R_5_ARG)
- char buf[2048];
- struct hostent hostent;
- ent = gethostbyname_r(name, &hostent, buf, sizeof(buf), &err);
- #elif defined(HAVE_GETHOSTBYNAME_R_3_ARG)
- struct hostent_data data;
- struct hostent hent;
- memset(&data, 0, sizeof(data));
- err = gethostbyname_r(name, &hent, &data);
- ent = err ? NULL : &hent;
- #else
- ent = gethostbyname(name);
- #ifdef MS_WINDOWS
- err = WSAGetLastError();
- #else
- err = h_errno;
- #endif
- #endif /* endif HAVE_GETHOSTBYNAME_R_6_ARG. */
- if (ent) {
- if (ent->h_addrtype == AF_INET) {
- tor_addr_from_in(addr, (struct in_addr*) ent->h_addr);
- } else if (ent->h_addrtype == AF_INET6) {
- tor_addr_from_in6(addr, (struct in6_addr*) ent->h_addr);
- } else {
- tor_assert(0); /* gethostbyname() returned a bizarre addrtype */
- }
- return 0;
- }
- #ifdef MS_WINDOWS
- return (err == WSATRY_AGAIN) ? 1 : -1;
- #else
- return (err == TRY_AGAIN) ? 1 : -1;
- #endif
- #endif
- }
- }
- /** Return true iff <b>ip</b> is an IP reserved to localhost or local networks
- * in RFC1918 or RFC4193 or RFC4291. (fec0::/10, deprecated by RFC3879, is
- * also treated as internal for now.)
- */
- int
- 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;
- 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 */
- v_family = AF_INET;
- iph4 = ntohl(tor_addr_to_in6_addr32(addr)[3]);
- }
- }
- if (v_family == AF_INET6) {
- const uint32_t *a32 = tor_addr_to_in6_addr32(addr);
- iph6[0] = ntohl(a32[0]);
- iph6[1] = ntohl(a32[1]);
- iph6[2] = ntohl(a32[2]);
- iph6[3] = ntohl(a32[3]);
- if (for_listening && !iph6[0] && !iph6[1] && !iph6[2] && !iph6[3]) /* :: */
- return 0;
- if (((iph6[0] & 0xfe000000) == 0xfc000000) || /* fc00/7 - RFC4193 */
- ((iph6[0] & 0xffc00000) == 0xfe800000) || /* fe80/10 - RFC4291 */
- ((iph6[0] & 0xffc00000) == 0xfec00000)) /* fec0/10 D- RFC3879 */
- return 1;
- if (!iph6[0] && !iph6[1] && !iph6[2] &&
- ((iph6[3] & 0xfffffffe) == 0x00000000)) /* ::/127 */
- return 1;
- return 0;
- } else if (v_family == AF_INET) {
- if (for_listening && !iph4) /* special case for binding to 0.0.0.0 */
- return 0;
- if (((iph4 & 0xff000000) == 0x0a000000) || /* 10/8 */
- ((iph4 & 0xff000000) == 0x00000000) || /* 0/8 */
- ((iph4 & 0xff000000) == 0x7f000000) || /* 127/8 */
- ((iph4 & 0xffff0000) == 0xa9fe0000) || /* 169.254/16 */
- ((iph4 & 0xfff00000) == 0xac100000) || /* 172.16/12 */
- ((iph4 & 0xffff0000) == 0xc0a80000)) /* 192.168/16 */
- return 1;
- return 0;
- }
- /* unknown address family... assume it's not safe for external use */
- /* rather than tor_assert(0) */
- log_warn(LD_BUG, "tor_addr_is_internal() called with a non-IP address.");
- return 1;
- }
- /** Convert a tor_addr_t <b>addr</b> into a string, and store it in
- * <b>dest</b> of size <b>len</b>. Returns a pointer to dest on success,
- * or NULL on failure. If <b>decorate</b>, surround IPv6 addresses with
- * brackets.
- */
- const char *
- tor_addr_to_str(char *dest, const tor_addr_t *addr, int len, int decorate)
- {
- const char *ptr;
- tor_assert(addr && dest);
- switch (tor_addr_family(addr)) {
- case AF_INET:
- if (len<3)
- return NULL;
- ptr = tor_inet_ntop(AF_INET, &addr->addr.in_addr, dest, len);
- break;
- case AF_INET6:
- if (decorate)
- ptr = tor_inet_ntop(AF_INET6, &addr->addr.in6_addr, dest+1, len-2);
- else
- ptr = tor_inet_ntop(AF_INET6, &addr->addr.in6_addr, dest, len);
- if (ptr && decorate) {
- *dest = '[';
- memcpy(dest+strlen(dest), "]", 2);
- tor_assert(ptr == dest+1);
- ptr = dest;
- }
- break;
- default:
- return NULL;
- }
- return ptr;
- }
- /** Parse an .in-addr.arpa or .ip6.arpa address from <b>address</b>. Return 0
- * if this is not an .in-addr.arpa address or an .ip6.arpa address. Return -1
- * if this is an ill-formed .in-addr.arpa address or an .ip6.arpa address.
- * Also return -1 if <b>family</b> is not AF_UNSPEC, and the parsed address
- * family does not match <b>family</b>. On success, return 1, and store the
- * result, if any, into <b>result</b>, if provided.
- *
- * If <b>accept_regular</b> is set and the address is in neither recognized
- * reverse lookup hostname format, try parsing the address as a regular
- * IPv4 or IPv6 address too.
- */
- int
- tor_addr_parse_reverse_lookup_name(tor_addr_t *result, const char *address,
- int family, int accept_regular)
- {
- if (!strcasecmpend(address, ".in-addr.arpa")) {
- /* We have an in-addr.arpa address. */
- char buf[INET_NTOA_BUF_LEN];
- size_t len;
- struct in_addr inaddr;
- if (family == AF_INET6)
- return -1;
- len = strlen(address) - strlen(".in-addr.arpa");
- if (len >= INET_NTOA_BUF_LEN)
- return -1; /* Too long. */
- memcpy(buf, address, len);
- buf[len] = ' ';
- if (tor_inet_aton(buf, &inaddr) == 0)
- return -1; /* malformed. */
- /* reverse the bytes */
- inaddr.s_addr = (uint32_t)
- (((inaddr.s_addr & 0x000000ff) << 24)
- |((inaddr.s_addr & 0x0000ff00) << 8)
- |((inaddr.s_addr & 0x00ff0000) >> 8)
- |((inaddr.s_addr & 0xff000000) >> 24));
- if (result) {
- tor_addr_from_in(result, &inaddr);
- }
- return 1;
- }
- if (!strcasecmpend(address, ".ip6.arpa")) {
- const char *cp;
- int i;
- int n0, n1;
- struct in6_addr in6;
- if (family == AF_INET)
- return -1;
- cp = address;
- for (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. */
- if (*cp++ != '.') return -1; /* Then another dot. */
- if (n0<0 || n1 < 0) /* Both nybbles must be hex. */
- return -1;
- /* We don't check the length of the string in here. But that's okay,
- * since we already know that the string ends with ".ip6.arpa", and
- * there is no way to frameshift .ip6.arpa so it fits into the pattern
- * of hexdigit, period, hexdigit, period that we enforce above.
- */
- /* Assign from low-byte to high-byte. */
- in6.s6_addr[15-i] = n0 | (n1 << 4);
- }
- if (strcasecmp(cp, "ip6.arpa"))
- return -1;
- if (result) {
- tor_addr_from_in6(result, &in6);
- }
- return 1;
- }
- if (accept_regular) {
- tor_addr_t tmp;
- int r = tor_addr_from_str(&tmp, address);
- if (r < 0)
- return 0;
- if (r != family && family != AF_UNSPEC)
- return -1;
- if (result)
- memcpy(result, &tmp, sizeof(tor_addr_t));
- return 1;
- }
- return 0;
- }
- /** Convert <b>addr</b> to an in-addr.arpa name or a .ip6.arpa name, and store
- * the result in the <b>outlen</b>-byte buffer at <b>out</b>. Return 0 on
- * success, -1 on failure. */
- int
- tor_addr_to_reverse_lookup_name(char *out, size_t outlen,
- const tor_addr_t *addr)
- {
- if (addr->family == AF_INET) {
- uint32_t a = tor_addr_to_ipv4h(addr);
- return tor_snprintf(out, outlen, "%d.%d.%d.%d.in-addr.arpa",
- (int)(uint8_t)((a )&0xff),
- (int)(uint8_t)((a>>8 )&0xff),
- (int)(uint8_t)((a>>16)&0xff),
- (int)(uint8_t)((a>>24)&0xff));
- } else if (addr->family == AF_INET6) {
- int i;
- char *cp = out;
- const uint8_t *bytes = tor_addr_to_in6_addr8(addr);
- if (outlen < REVERSE_LOOKUP_NAME_BUF_LEN)
- return -1;
- for (i = 15; i >= 0; --i) {
- uint8_t byte = bytes[i];
- *cp++ = "0123456789abcdef"[byte & 0x0f];
- *cp++ = '.';
- *cp++ = "0123456789abcdef"[byte >> 4];
- *cp++ = '.';
- }
- memcpy(cp, "ip6.arpa", 9); /* 8 characters plus NUL */
- return 0;
- }
- return -1;
- }
- /** Parse a string <b>s</b> containing an IPv4/IPv6 address, and possibly
- * a mask and port or port range. Store the parsed address in
- * <b>addr_out</b>, a mask (if any) in <b>mask_out</b>, and port(s) (if any)
- * in <b>port_min_out</b> and <b>port_max_out</b>.
- *
- * The syntax is:
- * Address OptMask OptPortRange
- * Address ::= IPv4Address / "[" IPv6Address "]" / "*"
- * OptMask ::= "/" Integer /
- * OptPortRange ::= ":*" / ":" Integer / ":" Integer "-" Integer /
- *
- * - If mask, minport, or maxport are NULL, we do not want these
- * options to be set; treat them as an error if present.
- * - If the string has no mask, the mask is set to /32 (IPv4) or /128 (IPv6).
- * - If the string has one port, it is placed in both min and max port
- * variables.
- * - If the string has no port(s), port_(min|max)_out are set to 1 and 65535.
- *
- * Return an address family on success, or -1 if an invalid address string is
- * provided.
- */
- int
- tor_addr_parse_mask_ports(const char *s, tor_addr_t *addr_out,
- maskbits_t *maskbits_out,
- uint16_t *port_min_out, uint16_t *port_max_out)
- {
- char *base = NULL, *address, *mask = NULL, *port = NULL, *rbracket = NULL;
- char *endptr;
- int any_flag=0, v4map=0;
- sa_family_t family;
- struct in6_addr in6_tmp;
- struct in_addr in_tmp;
- tor_assert(s);
- tor_assert(addr_out);
- /* IP, [], /mask, ports */
- #define MAX_ADDRESS_LENGTH (TOR_ADDR_BUF_LEN+2+(1+INET_NTOA_BUF_LEN)+12+1)
- if (strlen(s) > MAX_ADDRESS_LENGTH) {
- log_warn(LD_GENERAL, "Impossibly long IP %s; rejecting", escaped(s));
- goto err;
- }
- base = tor_strdup(s);
- /* Break 'base' into separate strings. */
- address = base;
- if (*address == '[') { /* Probably IPv6 */
- address++;
- rbracket = strchr(address, ']');
- if (!rbracket) {
- log_warn(LD_GENERAL,
- "No closing IPv6 bracket in address pattern; rejecting.");
- goto err;
- }
- }
- mask = strchr((rbracket?rbracket:address),'/');
- port = strchr((mask?mask:(rbracket?rbracket:address)), ':');
- if (port)
- *port++ = ' ';
- if (mask)
- *mask++ = ' ';
- if (rbracket)
- *rbracket = ' ';
- if (port && mask)
- tor_assert(port > mask);
- if (mask && rbracket)
- tor_assert(mask > rbracket);
- /* Now "address" is the a.b.c.d|'*'|abcd::1 part...
- * "mask" is the Mask|Maskbits part...
- * and "port" is the *|port|min-max part.
- */
- /* Process the address portion */
- memset(addr_out, 0, sizeof(tor_addr_t));
- if (!strcmp(address, "*")) {
- family = AF_INET; /* AF_UNSPEC ???? XXXX_IP6 */
- tor_addr_from_ipv4h(addr_out, 0);
- any_flag = 1;
- } else if (tor_inet_pton(AF_INET6, address, &in6_tmp) > 0) {
- family = AF_INET6;
- tor_addr_from_in6(addr_out, &in6_tmp);
- } else if (tor_inet_pton(AF_INET, address, &in_tmp) > 0) {
- family = AF_INET;
- tor_addr_from_in(addr_out, &in_tmp);
- } else {
- log_warn(LD_GENERAL, "Malformed IP %s in address pattern; rejecting.",
- escaped(address));
- goto err;
- }
- v4map = tor_addr_is_v4(addr_out);
- /* Parse mask */
- if (maskbits_out) {
- int bits = 0;
- struct in_addr v4mask;
- if (mask) { /* the caller (tried to) specify a mask */
- bits = (int) strtol(mask, &endptr, 10);
- if (!*endptr) { /* strtol converted everything, so it was an integer */
- if ((bits<0 || bits>128) ||
- (family == AF_INET && bits > 32)) {
- log_warn(LD_GENERAL,
- "Bad number of mask bits (%d) on address range; rejecting.",
- bits);
- goto err;
- }
- } else { /* mask might still be an address-style mask */
- if (tor_inet_pton(AF_INET, mask, &v4mask) > 0) {
- bits = addr_mask_get_bits(ntohl(v4mask.s_addr));
- if (bits < 0) {
- log_warn(LD_GENERAL,
- "IPv4-style mask %s is not a prefix address; rejecting.",
- escaped(mask));
- goto err;
- }
- } else { /* Not IPv4; we don't do address-style IPv6 masks. */
- log_warn(LD_GENERAL,
- "Malformed mask on address range %s; rejecting.",
- escaped(s));
- goto err;
- }
- }
- if (family == AF_INET6 && v4map) {
- if (bits > 32 && bits < 96) { /* Crazy */
- log_warn(LD_GENERAL,
- "Bad mask bits %i for V4-mapped V6 address; rejecting.",
- bits);
- goto err;
- }
- /* XXXX_IP6 is this really what we want? */
- bits = 96 + bits%32; /* map v4-mapped masks onto 96-128 bits */
- }
- } 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!) */
- else if (tor_addr_family(addr_out) == AF_INET)
- bits = 32;
- else if (tor_addr_family(addr_out) == AF_INET6)
- bits = 128;
- }
- *maskbits_out = (maskbits_t) bits;
- } else {
- if (mask) {
- log_warn(LD_GENERAL,
- "Unexpected mask in address %s; rejecting", escaped(s));
- goto err;
- }
- }
- /* Parse port(s) */
- if (port_min_out) {
- uint16_t port2;
- if (!port_max_out) /* caller specified one port; fake the second one */
- port_max_out = &port2;
- if (parse_port_range(port, port_min_out, port_max_out) < 0) {
- goto err;
- } else if ((*port_min_out != *port_max_out) && port_max_out == &port2) {
- log_warn(LD_GENERAL,
- "Wanted one port from address range, but there are two.");
- port_max_out = NULL; /* caller specified one port, so set this back */
- goto err;
- }
- } else {
- if (port) {
- log_warn(LD_GENERAL,
- "Unexpected ports in address %s; rejecting", escaped(s));
- goto err;
- }
- }
- tor_free(base);
- return tor_addr_family(addr_out);
- err:
- tor_free(base);
- return -1;
- }
- /** Determine whether an address is IPv4, either native or IPv4-mapped IPv6.
- * Note that this is about representation only, as any decent stack will
- * reject IPv4-mapped addresses received on the wire (and won't use them
- * on the wire either).
- */
- int
- tor_addr_is_v4(const tor_addr_t *addr)
- {
- tor_assert(addr);
- if (tor_addr_family(addr) == AF_INET)
- return 1;
- if (tor_addr_family(addr) == AF_INET6) {
- /* First two don't need to be ordered */
- uint32_t *a32 = tor_addr_to_in6_addr32(addr);
- if (a32[0] == 0 && a32[1] == 0 && ntohl(a32[2]) == 0x0000ffffu)
- return 1;
- }
- return 0; /* Not IPv4 - unknown family or a full-blood IPv6 address */
- }
- /** Determine whether an address <b>addr</b> is null, either all zeroes or
- * belonging to family AF_UNSPEC.
- */
- int
- tor_addr_is_null(const tor_addr_t *addr)
- {
- tor_assert(addr);
- switch (tor_addr_family(addr)) {
- case AF_INET6: {
- uint32_t *a32 = tor_addr_to_in6_addr32(addr);
- return (a32[0] == 0) && (a32[1] == 0) && (a32[2] == 0) && (a32[3] == 0);
- }
- case AF_INET:
- return (tor_addr_to_ipv4n(addr) == 0);
- case AF_UNSPEC:
- return 1;
- default:
- log_warn(LD_BUG, "Called with unknown address family %d",
- (int)tor_addr_family(addr));
- return 0;
- }
- //return 1;
- }
- /** Return true iff <b>addr</b> is a loopback address */
- int
- tor_addr_is_loopback(const tor_addr_t *addr)
- {
- tor_assert(addr);
- switch (tor_addr_family(addr)) {
- case AF_INET6: {
- /* ::1 */
- uint32_t *a32 = tor_addr_to_in6_addr32(addr);
- return (a32[0] == 0) && (a32[1] == 0) && (a32[2] == 0) && (a32[3] == 1);
- }
- case AF_INET:
- /* 127.0.0.1 */
- return (tor_addr_to_ipv4h(addr) & 0xff000000) == 0x7f000000;
- case AF_UNSPEC:
- return 0;
- default:
- tor_fragile_assert();
- return 0;
- }
- }
- /** Set <b>dest</b> to equal the IPv4 address in <b>v4addr</b> (given in
- * network order. */
- void
- tor_addr_from_ipv4n(tor_addr_t *dest, uint32_t v4addr)
- {
- tor_assert(dest);
- memset(dest, 0, sizeof(tor_addr_t));
- dest->family = AF_INET;
- dest->addr.in_addr.s_addr = v4addr;
- }
- /** Set <b>dest</b> to equal the IPv6 address in the 16 bytes at
- * <b>ipv6_bytes</b>. */
- void
- tor_addr_from_ipv6_bytes(tor_addr_t *dest, const char *ipv6_bytes)
- {
- tor_assert(dest);
- tor_assert(ipv6_bytes);
- memset(dest, 0, sizeof(tor_addr_t));
- dest->family = AF_INET6;
- memcpy(dest->addr.in6_addr.s6_addr, ipv6_bytes, 16);
- }
- /** Set <b>dest</b> equal to the IPv6 address in the in6_addr <b>in6</b>. */
- void
- tor_addr_from_in6(tor_addr_t *dest, const struct in6_addr *in6)
- {
- tor_addr_from_ipv6_bytes(dest, (const char*)in6->s6_addr);
- }
- /** Copy a tor_addr_t from <b>src</b> to <b>dest</b>.
- */
- void
- tor_addr_copy(tor_addr_t *dest, const tor_addr_t *src)
- {
- tor_assert(src);
- tor_assert(dest);
- memcpy(dest, src, sizeof(tor_addr_t));
- }
- /** Given two addresses <b>addr1</b> and <b>addr2</b>, return 0 if the two
- * addresses are equivalent under the mask mbits, less than 0 if addr1
- * precedes addr2, and greater than 0 otherwise.
- *
- * Different address families (IPv4 vs IPv6) are always considered unequal if
- * <b>how</b> is CMP_EXACT; otherwise, IPv6-mapped IPv4 addresses are
- * considered equivalent to their IPv4 equivalents.
- */
- int
- tor_addr_compare(const tor_addr_t *addr1, const tor_addr_t *addr2,
- tor_addr_comparison_t how)
- {
- return tor_addr_compare_masked(addr1, addr2, 128, how);
- }
- /** As tor_addr_compare(), but only looks at the first <b>mask</b> bits of
- * the address.
- *
- * Reduce over-specific masks (>128 for ipv6, >32 for ipv4) to 128 or 32.
- *
- * The mask is interpreted relative to <b>addr1</b>, so that if a is
- * ::ffff:1.2.3.4, and b is 3.4.5.6,
- * tor_addr_compare_masked(a,b,100,CMP_SEMANTIC) is the same as
- * -tor_addr_compare_masked(b,a,4,CMP_SEMANTIC).
- *
- * We guarantee that the ordering from tor_addr_compare_masked is a total
- * order on addresses, but not that it is any particular order, or that it
- * will be the same from one version to the next.
- */
- int
- tor_addr_compare_masked(const tor_addr_t *addr1, const tor_addr_t *addr2,
- maskbits_t mbits, tor_addr_comparison_t how)
- {
- #define TRISTATE(a,b) (((a)<(b))?-1: (((a)==(b))?0:1))
- sa_family_t family1, family2, v_family1, v_family2;
- tor_assert(addr1 && addr2);
- v_family1 = family1 = tor_addr_family(addr1);
- v_family2 = family2 = tor_addr_family(addr2);
- if (family1==family2) {
- /* When the families are the same, there's only one way to do the
- * comparison: exactly. */
- int r;
- switch (family1) {
- case AF_UNSPEC:
- return 0; /* All unspecified addresses are equal */
- case AF_INET: {
- uint32_t a1 = tor_addr_to_ipv4h(addr1);
- uint32_t a2 = tor_addr_to_ipv4h(addr2);
- if (mbits <= 0)
- return 0;
- if (mbits > 32)
- mbits = 32;
- a1 >>= (32-mbits);
- a2 >>= (32-mbits);
- r = TRISTATE(a1, a2);
- return r;
- }
- case AF_INET6: {
- 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;
- const int leftover_bits = mbits & 7;
- if (bytes && (r = memcmp(a1, a2, bytes))) {
- return r;
- } else if (leftover_bits) {
- uint8_t b1 = a1[bytes] >> (8-leftover_bits);
- uint8_t b2 = a2[bytes] >> (8-leftover_bits);
- return TRISTATE(b1, b2);
- } else {
- return 0;
- }
- }
- default:
- tor_fragile_assert();
- return 0;
- }
- } else if (how == CMP_EXACT) {
- /* Unequal families and an exact comparison? Stop now! */
- return TRISTATE(family1, family2);
- }
- if (mbits == 0)
- return 0;
- if (family1 == AF_INET6 && tor_addr_is_v4(addr1))
- v_family1 = AF_INET;
- if (family2 == AF_INET6 && tor_addr_is_v4(addr2))
- v_family2 = AF_INET;
- if (v_family1 == v_family2) {
- /* One or both addresses are a mapped ipv4 address. */
- uint32_t a1, a2;
- if (family1 == AF_INET6) {
- a1 = tor_addr_to_mapped_ipv4h(addr1);
- if (mbits <= 96)
- return 0;
- mbits -= 96; /* We just decided that the first 96 bits of a1 "match". */
- } else {
- a1 = tor_addr_to_ipv4h(addr1);
- }
- if (family2 == AF_INET6) {
- a2 = tor_addr_to_mapped_ipv4h(addr2);
- } else {
- a2 = tor_addr_to_ipv4h(addr2);
- }
- if (mbits <= 0) return 0;
- if (mbits > 32) mbits = 32;
- a1 >>= (32-mbits);
- a2 >>= (32-mbits);
- return TRISTATE(a1, a2);
- } else {
- /* Unequal families, and semantic comparison, and no semantic family
- * matches. */
- return TRISTATE(family1, family2);
- }
- }
- /** Return a hash code based on the address addr */
- unsigned int
- tor_addr_hash(const tor_addr_t *addr)
- {
- switch (tor_addr_family(addr)) {
- case AF_INET:
- return tor_addr_to_ipv4h(addr);
- case AF_UNSPEC:
- return 0x4e4d5342;
- case AF_INET6: {
- const uint32_t *u = tor_addr_to_in6_addr32(addr);
- return u[0] + u[1] + u[2] + u[3];
- }
- default:
- tor_fragile_assert();
- return 0;
- }
- }
- /** Return a newly allocated string with a representation of <b>addr</b>. */
- char *
- tor_dup_addr(const tor_addr_t *addr)
- {
- char buf[TOR_ADDR_BUF_LEN];
- tor_addr_to_str(buf, addr, sizeof(buf), 0);
- return tor_strdup(buf);
- }
- /** Copy the address in <b>src</b> to <b>dest</b> */
- void
- tor_addr_assign(tor_addr_t *dest, const tor_addr_t *src)
- {
- memcpy(dest, src, sizeof(tor_addr_t));
- }
- /** Return a string representing the address <b>addr</b>. This string is
- * statically allocated, and must not be freed. Each call to
- * <b>fmt_addr</b> invalidates the last result of the function. This
- * function is not thread-safe. */
- const char *
- fmt_addr(const tor_addr_t *addr)
- {
- static char buf[TOR_ADDR_BUF_LEN];
- if (!addr) return "<null>";
- tor_addr_to_str(buf, addr, sizeof(buf), 0);
- return buf;
- }
- /** Convert the string in <b>src</b> to a tor_addr_t <b>addr</b>. The string
- * may be an IPv4 address, an IPv6 address, or an IPv6 address surrounded by
- * square brackets.
- *
- * Return an address family on success, or -1 if an invalid address string is
- * provided. */
- int
- tor_addr_from_str(tor_addr_t *addr, const char *src)
- {
- char *tmp = NULL; /* Holds substring if we got a dotted quad. */
- int result;
- struct in_addr in_tmp;
- struct in6_addr in6_tmp;
- tor_assert(addr && src);
- if (src[0] == '[' && src[1])
- src = tmp = tor_strndup(src+1, strlen(src)-2);
- if (tor_inet_pton(AF_INET6, src, &in6_tmp) > 0) {
- result = AF_INET6;
- tor_addr_from_in6(addr, &in6_tmp);
- } else if (tor_inet_pton(AF_INET, src, &in_tmp) > 0) {
- result = AF_INET;
- tor_addr_from_in(addr, &in_tmp);
- } else {
- result = -1;
- }
- tor_free(tmp);
- return result;
- }
- /** Parse an address or address-port combination from <b>s</b>, resolve the
- * address as needed, and put the result in <b>addr_out</b> and (optionally)
- * <b>port_out</b>. Return 0 on success, negative on failure. */
- int
- tor_addr_port_parse(const char *s, tor_addr_t *addr_out, uint16_t *port_out)
- {
- const char *port;
- tor_addr_t addr;
- uint16_t portval;
- char *tmp = NULL;
- tor_assert(s);
- tor_assert(addr_out);
- s = eat_whitespace(s);
- if (*s == '[') {
- port = strstr(s, "]");
- if (!port)
- goto err;
- tmp = tor_strndup(s+1, port-(s+1));
- port = port+1;
- if (*port == ':')
- port++;
- else
- port = NULL;
- } else {
- port = strchr(s, ':');
- if (port)
- tmp = tor_strndup(s, port-s);
- else
- tmp = tor_strdup(s);
- if (port)
- ++port;
- }
- if (tor_addr_lookup(tmp, AF_UNSPEC, &addr) < 0)
- goto err;
- tor_free(tmp);
- if (port) {
- portval = (int) tor_parse_long(port, 10, 1, 65535, NULL, NULL);
- if (!portval)
- goto err;
- } else {
- portval = 0;
- }
- if (port_out)
- *port_out = portval;
- tor_addr_copy(addr_out, &addr);
- return 0;
- err:
- tor_free(tmp);
- return -1;
- }
- /** 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.
- */
- int
- get_interface_address6(int severity, sa_family_t family, tor_addr_t *addr)
- {
- int sock=-1, r=-1;
- struct sockaddr_storage my_addr, target_addr;
- socklen_t my_addr_len;
- tor_assert(addr);
- memset(addr, 0, sizeof(tor_addr_t));
- memset(&target_addr, 0, sizeof(target_addr));
- my_addr_len = (socklen_t)sizeof(my_addr);
- /* Use the "discard" service port */
- ((struct sockaddr_in*)&target_addr)->sin_port = 9;
- /* Don't worry: no packets are sent. We just need to use a real address
- * on the actual Internet. */
- if (family == AF_INET6) {
- struct sockaddr_in6 *sin6 = (struct sockaddr_in6*)&target_addr;
- sock = tor_open_socket(PF_INET6,SOCK_DGRAM,IPPROTO_UDP);
- my_addr_len = (socklen_t)sizeof(struct sockaddr_in6);
- sin6->sin6_family = AF_INET6;
- S6_ADDR16(sin6->sin6_addr)[0] = htons(0x2002); /* 2002:: */
- } else if (family == AF_INET) {
- struct sockaddr_in *sin = (struct sockaddr_in*)&target_addr;
- sock = tor_open_socket(PF_INET,SOCK_DGRAM,IPPROTO_UDP);
- my_addr_len = (socklen_t)sizeof(struct sockaddr_in);
- sin->sin_family = AF_INET;
- sin->sin_addr.s_addr = htonl(0x12000001); /* 18.0.0.1 */
- } else {
- return -1;
- }
- if (sock < 0) {
- int e = tor_socket_errno(-1);
- log_fn(severity, LD_NET, "unable to create socket: %s",
- tor_socket_strerror(e));
- goto err;
- }
- if (connect(sock,(struct sockaddr *)&target_addr,
- (socklen_t)sizeof(target_addr))<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, &my_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;
- err:
- if (sock >= 0)
- tor_close_socket(sock);
- return r;
- }
- /* ======
- * IPv4 helpers
- * XXXX022 IPv6 deprecate some of these.
- */
- /** Return true iff <b>ip</b> (in host order) is an IP reserved to localhost,
- * or reserved for local networks by RFC 1918.
- */
- int
- is_internal_IP(uint32_t ip, int for_listening)
- {
- tor_addr_t myaddr;
- myaddr.family = AF_INET;
- myaddr.addr.in_addr.s_addr = htonl(ip);
- return tor_addr_is_internal(&myaddr, for_listening);
- }
- /** Parse a string of the form "host[:port]" from <b>addrport</b>. If
- * <b>address</b> is provided, set *<b>address</b> to a copy of the
- * host portion of the string. If <b>addr</b> is provided, try to
- * resolve the host portion of the string and store it into
- * *<b>addr</b> (in host byte order). If <b>port_out</b> is provided,
- * store the port number into *<b>port_out</b>, or 0 if no port is given.
- * If <b>port_out</b> is NULL, then there must be no port number in
- * <b>addrport</b>.
- * Return 0 on success, -1 on failure.
- */
- int
- parse_addr_port(int severity, const char *addrport, char **address,
- uint32_t *addr, uint16_t *port_out)
- {
- const char *colon;
- char *_address = NULL;
- int _port;
- int ok = 1;
- tor_assert(addrport);
- colon = strchr(addrport, ':');
- if (colon) {
- _address = tor_strndup(addrport, colon-addrport);
- _port = (int) tor_parse_long(colon+1,10,1,65535,NULL,NULL);
- if (!_port) {
- log_fn(severity, LD_GENERAL, "Port %s out of range", escaped(colon+1));
- ok = 0;
- }
- if (!port_out) {
- char *esc_addrport = esc_for_log(addrport);
- log_fn(severity, LD_GENERAL,
- "Port %s given on %s when not required",
- escaped(colon+1), esc_addrport);
- tor_free(esc_addrport);
- ok = 0;
- }
- } else {
- _address = tor_strdup(addrport);
- _port = 0;
- }
- if (addr) {
- /* There's an addr pointer, so we need to resolve the hostname. */
- if (tor_lookup_hostname(_address,addr)) {
- log_fn(severity, LD_NET, "Couldn't look up %s", escaped(_address));
- ok = 0;
- *addr = 0;
- }
- }
- if (address && ok) {
- *address = _address;
- } else {
- if (address)
- *address = NULL;
- tor_free(_address);
- }
- if (port_out)
- *port_out = ok ? ((uint16_t) _port) : 0;
- return ok ? 0 : -1;
- }
- /** If <b>mask</b> is an address mask for a bit-prefix, return the number of
- * bits. Otherwise, return -1. */
- int
- addr_mask_get_bits(uint32_t mask)
- {
- int i;
- if (mask == 0)
- return 0;
- if (mask == 0xFFFFFFFFu)
- return 32;
- for (i=0; i<=32; ++i) {
- if (mask == (uint32_t) ~((1u<<(32-i))-1)) {
- return i;
- }
- }
- return -1;
- }
- /** Compare two addresses <b>a1</b> and <b>a2</b> for equality under a
- * netmask of <b>mbits</b> bits. Return -1, 0, or 1.
- *
- * XXXX_IP6 Temporary function to allow masks as bitcounts everywhere. This
- * will be replaced with an IPv6-aware version as soon as 32-bit addresses are
- * no longer passed around.
- */
- int
- addr_mask_cmp_bits(uint32_t a1, uint32_t a2, maskbits_t bits)
- {
- if (bits > 32)
- bits = 32;
- else if (bits == 0)
- return 0;
- a1 >>= (32-bits);
- a2 >>= (32-bits);
- if (a1 < a2)
- return -1;
- else if (a1 > a2)
- return 1;
- else
- return 0;
- }
- /** Parse a string <b>s</b> in the format of (*|port(-maxport)?)?, setting the
- * various *out pointers as appropriate. Return 0 on success, -1 on failure.
- */
- int
- parse_port_range(const char *port, uint16_t *port_min_out,
- uint16_t *port_max_out)
- {
- int port_min, port_max, ok;
- tor_assert(port_min_out);
- tor_assert(port_max_out);
- if (!port || *port == ' ' || strcmp(port, "*") == 0) {
- port_min = 1;
- port_max = 65535;
- } else {
- char *endptr = NULL;
- port_min = (int)tor_parse_long(port, 10, 0, 65535, &ok, &endptr);
- if (!ok) {
- log_warn(LD_GENERAL,
- "Malformed port %s on address range; rejecting.",
- escaped(port));
- return -1;
- } else if (endptr && *endptr == '-') {
- port = endptr+1;
- endptr = NULL;
- port_max = (int)tor_parse_long(port, 10, 1, 65536, &ok, &endptr);
- if (!ok) {
- log_warn(LD_GENERAL,
- "Malformed port %s on address range; rejecting.",
- escaped(port));
- return -1;
- }
- } else {
- port_max = port_min;
- }
- if (port_min > port_max) {
- log_warn(LD_GENERAL, "Insane port range on address policy; rejecting.");
- return -1;
- }
- }
- if (port_min < 1)
- port_min = 1;
- if (port_max > 65535)
- port_max = 65535;
- *port_min_out = (uint16_t) port_min;
- *port_max_out = (uint16_t) port_max;
- return 0;
- }
- /** Parse a string <b>s</b> in the format of
- * (IP(/mask|/mask-bits)?|*)(:(*|port(-maxport))?)?, setting the various
- * *out pointers as appropriate. Return 0 on success, -1 on failure.
- */
- int
- parse_addr_and_port_range(const char *s, uint32_t *addr_out,
- maskbits_t *maskbits_out, uint16_t *port_min_out,
- uint16_t *port_max_out)
- {
- char *address;
- char *mask, *port, *endptr;
- struct in_addr in;
- int bits;
- tor_assert(s);
- tor_assert(addr_out);
- tor_assert(maskbits_out);
- tor_assert(port_min_out);
- tor_assert(port_max_out);
- address = tor_strdup(s);
- /* Break 'address' into separate strings.
- */
- mask = strchr(address,'/');
- port = strchr(mask?mask:address,':');
- if (mask)
- *mask++ = ' ';
- if (port)
- *port++ = ' ';
- /* Now "address" is the IP|'*' part...
- * "mask" is the Mask|Maskbits part...
- * and "port" is the *|port|min-max part.
- */
- if (strcmp(address,"*")==0) {
- *addr_out = 0;
- } else if (tor_inet_aton(address, &in) != 0) {
- *addr_out = ntohl(in.s_addr);
- } else {
- log_warn(LD_GENERAL, "Malformed IP %s in address pattern; rejecting.",
- escaped(address));
- goto err;
- }
- if (!mask) {
- if (strcmp(address,"*")==0)
- *maskbits_out = 0;
- else
- *maskbits_out = 32;
- } else {
- endptr = NULL;
- bits = (int) strtol(mask, &endptr, 10);
- if (!*endptr) {
- /* strtol handled the whole mask. */
- if (bits < 0 || bits > 32) {
- log_warn(LD_GENERAL,
- "Bad number of mask bits on address range; rejecting.");
- goto err;
- }
- *maskbits_out = bits;
- } else if (tor_inet_aton(mask, &in) != 0) {
- bits = addr_mask_get_bits(ntohl(in.s_addr));
- if (bits < 0) {
- log_warn(LD_GENERAL,
- "Mask %s on address range isn't a prefix; dropping",
- escaped(mask));
- goto err;
- }
- *maskbits_out = bits;
- } else {
- log_warn(LD_GENERAL,
- "Malformed mask %s on address range; rejecting.",
- escaped(mask));
- goto err;
- }
- }
- if (parse_port_range(port, port_min_out, port_max_out)<0)
- goto err;
- tor_free(address);
- return 0;
- err:
- tor_free(address);
- return -1;
- }
- /** Given an IPv4 in_addr struct *<b>in</b> (in network order, as usual),
- * write it as a string into the <b>buf_len</b>-byte buffer in
- * <b>buf</b>.
- */
- int
- tor_inet_ntoa(const struct in_addr *in, char *buf, size_t buf_len)
- {
- uint32_t a = ntohl(in->s_addr);
- return tor_snprintf(buf, buf_len, "%d.%d.%d.%d",
- (int)(uint8_t)((a>>24)&0xff),
- (int)(uint8_t)((a>>16)&0xff),
- (int)(uint8_t)((a>>8 )&0xff),
- (int)(uint8_t)((a )&0xff));
- }
- /** Given a host-order <b>addr</b>, call tor_inet_ntop() on it
- * and return a strdup of the resulting address.
- */
- char *
- tor_dup_ip(uint32_t addr)
- {
- char buf[TOR_ADDR_BUF_LEN];
- struct in_addr in;
- in.s_addr = htonl(addr);
- tor_inet_ntop(AF_INET, &in, buf, sizeof(buf));
- return tor_strdup(buf);
- }
- /**
- * 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.
- */
- int
- get_interface_address(int severity, uint32_t *addr)
- {
- tor_addr_t local_addr;
- int r;
- r = get_interface_address6(severity, AF_INET, &local_addr);
- if (r>=0)
- *addr = tor_addr_to_ipv4h(&local_addr);
- return r;
- }