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Make relays handle an address suggestion from a directory server giving an IPv6 address.
last_guessed_ip becomes a tor_addr_t. Most parts of router_new_address_suggestion() learns about IPv6 (resolve_my_address() is still IPv4 only).
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changes/bug4875
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3
changes/bug4875
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@ -0,0 +1,3 @@
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o Minor bugfixes
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- Relays now understand an IPv6 address when they get one from a
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directory server. Fixes bug 4875.
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@ -38,6 +38,8 @@ typedef struct tor_addr_port_t
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uint16_t port;
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} tor_addr_port_t;
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#define TOR_ADDR_NULL {AF_UNSPEC, {{0}}};
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static INLINE const struct in6_addr *tor_addr_to_in6(const tor_addr_t *a);
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static INLINE uint32_t tor_addr_to_ipv4n(const tor_addr_t *a);
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static INLINE uint32_t tor_addr_to_ipv4h(const tor_addr_t *a);
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@ -2802,6 +2802,7 @@ static uint32_t last_resolved_addr = 0;
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* set *<b>hostname_out</b> to a new string holding the hostname we used to
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* get the address. Return 0 if all is well, or -1 if we can't find a suitable
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* public IP address.
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* XXXX ipv6
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*/
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int
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resolve_my_address(int warn_severity, const or_options_t *options,
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@ -1775,21 +1775,20 @@ check_descriptor_bandwidth_changed(time_t now)
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/** Note at log level severity that our best guess of address has changed from
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* <b>prev</b> to <b>cur</b>. */
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static void
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log_addr_has_changed(int severity, uint32_t prev, uint32_t cur,
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log_addr_has_changed(int severity,
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const tor_addr_t *prev,
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const tor_addr_t *cur,
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const char *source)
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{
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char addrbuf_prev[INET_NTOA_BUF_LEN];
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char addrbuf_cur[INET_NTOA_BUF_LEN];
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struct in_addr in_prev;
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struct in_addr in_cur;
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char addrbuf_prev[TOR_ADDR_BUF_LEN];
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char addrbuf_cur[TOR_ADDR_BUF_LEN];
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in_prev.s_addr = htonl(prev);
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tor_inet_ntoa(&in_prev, addrbuf_prev, sizeof(addrbuf_prev));
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if (tor_addr_to_str(addrbuf_prev, prev, sizeof(addrbuf_prev), 1) == NULL)
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strlcpy(addrbuf_prev, "???", TOR_ADDR_BUF_LEN);
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if (tor_addr_to_str(addrbuf_cur, cur, sizeof(addrbuf_cur), 1) == NULL)
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strlcpy(addrbuf_cur, "???", TOR_ADDR_BUF_LEN);
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in_cur.s_addr = htonl(cur);
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tor_inet_ntoa(&in_cur, addrbuf_cur, sizeof(addrbuf_cur));
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if (prev)
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if (!tor_addr_is_null(prev))
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log_fn(severity, LD_GENERAL,
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"Our IP Address has changed from %s to %s; "
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"rebuilding descriptor (source: %s).",
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@ -1813,6 +1812,7 @@ check_descriptor_ipaddress_changed(time_t now)
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if (!desc_routerinfo)
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return;
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/* XXXX ipv6 */
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prev = desc_routerinfo->addr;
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if (resolve_my_address(LOG_INFO, options, &cur, NULL) < 0) {
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log_info(LD_CONFIG,"options->Address didn't resolve into an IP.");
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@ -1820,14 +1820,17 @@ check_descriptor_ipaddress_changed(time_t now)
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}
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if (prev != cur) {
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log_addr_has_changed(LOG_NOTICE, prev, cur, "resolve");
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tor_addr_t tmp_prev, tmp_cur;
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tor_addr_from_ipv4h(&tmp_prev, prev);
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tor_addr_from_ipv4h(&tmp_cur, cur);
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log_addr_has_changed(LOG_NOTICE, &tmp_prev, &tmp_cur, "resolve");
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ip_address_changed(0);
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}
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}
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/** The most recently guessed value of our IP address, based on directory
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* headers. */
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static uint32_t last_guessed_ip = 0;
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static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;
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/** A directory server <b>d_conn</b> told us our IP address is
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* <b>suggestion</b>.
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@ -1837,35 +1840,36 @@ void
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router_new_address_suggestion(const char *suggestion,
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const dir_connection_t *d_conn)
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{
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uint32_t addr, cur = 0;
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struct in_addr in;
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tor_addr_t addr;
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uint32_t cur = 0; /* Current IPv4 address. */
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const or_options_t *options = get_options();
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/* first, learn what the IP address actually is */
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if (!tor_inet_aton(suggestion, &in)) {
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if (tor_addr_parse(&addr, suggestion) == -1) {
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log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
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escaped(suggestion));
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return;
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}
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addr = ntohl(in.s_addr);
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log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
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if (!server_mode(options)) {
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last_guessed_ip = addr; /* store it in case we need it later */
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tor_addr_copy(&last_guessed_ip, &addr);
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return;
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}
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/* XXXX ipv6 */
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if (resolve_my_address(LOG_INFO, options, &cur, NULL) >= 0) {
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/* We're all set -- we already know our address. Great. */
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last_guessed_ip = cur; /* store it in case we need it later */
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tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
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need it later */
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return;
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}
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if (is_internal_IP(addr, 0)) {
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if (tor_addr_is_internal(&addr, 0)) {
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/* Don't believe anybody who says our IP is, say, 127.0.0.1. */
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return;
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}
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if (tor_addr_eq_ipv4h(&d_conn->_base.addr, addr)) {
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if (tor_addr_eq(&d_conn->_base.addr, &addr)) {
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/* Don't believe anybody who says our IP is their IP. */
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log_debug(LD_DIR, "A directory server told us our IP address is %s, "
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"but he's just reporting his own IP address. Ignoring.",
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@ -1876,14 +1880,15 @@ router_new_address_suggestion(const char *suggestion,
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/* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
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* us an answer different from what we had the last time we managed to
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* resolve it. */
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if (last_guessed_ip != addr) {
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if (!tor_addr_eq(&last_guessed_ip, &addr)) {
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control_event_server_status(LOG_NOTICE,
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"EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
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suggestion);
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log_addr_has_changed(LOG_NOTICE, last_guessed_ip, addr,
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log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
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d_conn->_base.address);
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ip_address_changed(0);
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last_guessed_ip = addr; /* router_rebuild_descriptor() will fetch it */
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tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
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will fetch it */
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}
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}
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@ -1894,8 +1899,8 @@ router_new_address_suggestion(const char *suggestion,
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static int
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router_guess_address_from_dir_headers(uint32_t *guess)
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{
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if (last_guessed_ip) {
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*guess = last_guessed_ip;
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if (!tor_addr_is_null(&last_guessed_ip)) {
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*guess = tor_addr_to_ipv4h(&last_guessed_ip);
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return 0;
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}
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return -1;
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