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[forward-port] Implement an option, VirtualAddrMask, to set which addresses get handed out in response to mapaddress requests. Needs testing and docs!
svn:r6398
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6ebd886511
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@ -238,6 +238,7 @@ static config_var_t _option_vars[] = {
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VAR("User", STRING, User, NULL),
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VAR("V1AuthoritativeDirectory",BOOL, V1AuthoritativeDir, "0"),
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VAR("VersioningAuthoritativeDirectory",BOOL,VersioningAuthoritativeDir, "0"),
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VAR("VirtualAddrNetwork", STRING, VirtualAddrNetwork, "127.192.0.0/10"),
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VAR("__LeaveStreamsUnattached", BOOL,LeaveStreamsUnattached, "0"),
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{ NULL, CONFIG_TYPE_OBSOLETE, 0, NULL }
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};
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@ -677,6 +678,7 @@ options_act(or_options_t *old_options)
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size_t len;
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or_options_t *options = get_options();
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int running_tor = options->command == CMD_RUN_TOR;
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const char *msg;
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clear_trusted_dir_servers();
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if (options->DirServers) {
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@ -745,6 +747,7 @@ options_act(or_options_t *old_options)
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/* Register addressmap directives */
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config_register_addressmaps(options);
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parse_virtual_addr_network(options->VirtualAddrNetwork, 0, &msg);
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/* Update address policies. */
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policies_parse_from_options(options);
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@ -2404,6 +2407,9 @@ options_validate(or_options_t *old_options, or_options_t *options,
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if (rend_config_services(options, 1) < 0)
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REJECT("Failed to configure rendezvous options. See logs for details.");
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if (parse_virtual_addr_network(options->VirtualAddrNetwork, 1, msg)<0)
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return -1;
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return 0;
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#undef REJECT
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#undef COMPLAIN
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@ -750,15 +750,65 @@ client_dns_set_addressmap(const char *address, uint32_t val,
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time(NULL) + ttl);
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}
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/* Currently, we hand out 127.192.0.1 through 127.254.254.254.
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/* By default, we hand out 127.192.0.1 through 127.254.254.254.
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* These addresses should map to localhost, so even if the
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* application accidentally tried to connect to them directly (not
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* via Tor), it wouldn't get too far astray.
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*
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* Eventually, we should probably make this configurable.
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*/
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#define MIN_UNUSED_IPV4 0x7fc00001u
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#define MAX_UNUSED_IPV4 0x7ffefefeu
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static uint32_t virtual_addr_network = 0x7fc00000u;
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static uint32_t virtual_addr_netmask = 0xffc00000u;
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static int virtual_addr_netmask_bits = 10;
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static uint32_t next_virtual_addr = 0x7fc00000u;
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/** Read a netmask of the form 127.192.0.0/10 from "val", and check whether
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* it's a valid set of virtual addresses to hand out in response to MAPADDRESS
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* requests. Return 0 on success; set *msg and return -1 on failure. If
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* validate_only is false, sets the actual virtual address range to the parsed
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* value. */
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int
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parse_virtual_addr_network(const char *val, int validate_only,
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const char **msg)
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{
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uint32_t addr, mask;
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uint16_t port_min, port_max;
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int bits;
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if (parse_addr_and_port_range(val, &addr, &mask, &port_min, &port_max)) {
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*msg = "Error parsing VirtualAddressNetwork";
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return -1;
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}
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if (port_min != 1 || port_max != 65535) {
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*msg = "Can't specify ports on VirtualAddressNetwork";
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return -1;
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}
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bits = addr_mask_get_bits(mask);
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if (bits < 0) {
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*msg = "VirtualAddressNetwork must have a mask that can be expressed "
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"as a prefix";
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return -1;
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}
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if (bits > 16) {
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*msg = "VirtualAddressNetwork expects a class B network or larger";
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return -1;
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}
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if (validate_only)
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return 0;
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virtual_addr_network = addr & mask;
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virtual_addr_netmask = mask;
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virtual_addr_netmask_bits = bits;
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if ((next_virtual_addr & mask) != addr)
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next_virtual_addr = addr;
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return 0;
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}
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/**
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* Return true iff <b>addr</b> is likely to have been returned by
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@ -773,7 +823,7 @@ address_is_in_virtual_range(const char *address)
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return 1;
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} else if (tor_inet_aton(address, &in)) {
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uint32_t addr = ntohl(in.s_addr);
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if (addr >= MIN_UNUSED_IPV4 && addr <= MAX_UNUSED_IPV4)
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if ((addr & virtual_addr_netmask) == virtual_addr_network)
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return 1;
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}
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return 0;
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@ -787,7 +837,6 @@ static char *
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addressmap_get_virtual_address(int type)
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{
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char buf[64];
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static uint32_t next_ipv4 = MIN_UNUSED_IPV4;
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struct in_addr in;
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if (type == RESOLVED_TYPE_HOSTNAME) {
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@ -799,19 +848,26 @@ addressmap_get_virtual_address(int type)
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} while (strmap_get(addressmap, buf));
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return tor_strdup(buf);
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} else if (type == RESOLVED_TYPE_IPV4) {
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while (1) {
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uint32_t available = 1u << virtual_addr_netmask_bits;
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while (available) {
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/* Don't hand out any .0 or .255 address. */
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while ((next_ipv4 & 0xff) == 0 ||
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(next_ipv4 & 0xff) == 0xff)
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++next_ipv4;
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in.s_addr = htonl(next_ipv4);
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while ((next_virtual_addr & 0xff) == 0 ||
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(next_virtual_addr & 0xff) == 0xff) {
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++next_virtual_addr;
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}
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in.s_addr = htonl(next_virtual_addr);
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tor_inet_ntoa(&in, buf, sizeof(buf));
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if (!strmap_get(addressmap, buf))
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break;
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++next_ipv4;
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if (next_ipv4 > MAX_UNUSED_IPV4)
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next_ipv4 = MIN_UNUSED_IPV4;
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++next_virtual_addr;
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--available;
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if (! --available) {
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log_warn(LD_CONFIG, "Ran out of virtual addresses!");
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return NULL;
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}
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if ((next_virtual_addr & virtual_addr_netmask) != virtual_addr_network)
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next_virtual_addr = virtual_addr_network;
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}
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return tor_strdup(buf);
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} else {
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@ -1383,6 +1383,9 @@ typedef struct {
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* of our PK time by sending CREATE_FAST cells? */
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addr_policy_t *reachable_addr_policy; /**< Parsed from ReachableAddresses */
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char *VirtualAddrNetwork; /**< Address and mask to hand out for virtual
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* MAPADDRESS requests. */
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} or_options_t;
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/** Persistent state for an onion router, as saved to disk. */
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@ -1725,6 +1728,8 @@ void addressmap_rewrite(char *address, size_t maxlen);
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int addressmap_already_mapped(const char *address);
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void addressmap_register(const char *address, char *new_address,
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time_t expires);
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int parse_virtual_addr_network(const char *val, int validate_only,
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const char **msg);
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int client_dns_incr_failures(const char *address);
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void client_dns_clear_failures(const char *address);
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void client_dns_set_addressmap(const char *address, uint32_t val,
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