mirrors/tor
1
0
Fork 0
mirror of https://gitlab.torproject.org/tpo/core/tor.git synced 2025-02-25 15:10:48 +01:00
Code Issues Projects Releases Wiki Activity

Merge remote-tracking branch 'tor-github/pr/1880/head'

Browse source
This commit is contained in:
Nick Mathewson 2020-05-07 08:19:11 -04:00
commit b7a165228f
26 changed files with 520 additions and 417 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

4
changes/ticket33789 Normal file
View file

@ -0,0 +1,4 @@
o Code simplification and refactoring (relay address):
- Move a series of functions related to address resolving into their own
files. Closes ticket 33789.

2
scripts/maint/practracker/exceptions.txt
View file

@ -36,7 +36,6 @@
problem file-size /src/app/config/config.c 7525 problem file-size /src/app/config/config.c 7525
problem include-count /src/app/config/config.c 80 problem include-count /src/app/config/config.c 80
problem function-size /src/app/config/config.c:options_act() 381 problem function-size /src/app/config/config.c:options_act() 381
problem function-size /src/app/config/config.c:resolve_my_address() 191
problem function-size /src/app/config/config.c:options_validate_cb() 794 problem function-size /src/app/config/config.c:options_validate_cb() 794
problem function-size /src/app/config/config.c:options_init_from_torrc() 192 problem function-size /src/app/config/config.c:options_init_from_torrc() 192
problem function-size /src/app/config/config.c:options_init_from_string() 103 problem function-size /src/app/config/config.c:options_init_from_string() 103
@ -47,6 +46,7 @@ problem function-size /src/app/config/config.c:parse_dir_authority_line() 150
problem function-size /src/app/config/config.c:parse_dir_fallback_line() 101 problem function-size /src/app/config/config.c:parse_dir_fallback_line() 101
problem function-size /src/app/config/config.c:port_parse_config() 435 problem function-size /src/app/config/config.c:port_parse_config() 435
problem function-size /src/app/config/config.c:parse_ports() 132 problem function-size /src/app/config/config.c:parse_ports() 132
problem function-size /src/app/config/resolve_addr.c:resolve_my_address() 191
problem file-size /src/app/config/or_options_st.h 1050 problem file-size /src/app/config/or_options_st.h 1050
problem include-count /src/app/main/main.c 68 problem include-count /src/app/main/main.c 68
problem function-size /src/app/main/main.c:dumpstats() 102 problem function-size /src/app/main/main.c:dumpstats() 102

289
src/app/config/config.c
View file

@ -2722,23 +2722,6 @@ list_enabled_modules(void)
// test variants in test_parseconf.sh to no useful purpose. // test variants in test_parseconf.sh to no useful purpose.
} }
/** Last value actually set by resolve_my_address. */
static uint32_t last_resolved_addr = 0;
/** Accessor for last_resolved_addr from outside this file. */
uint32_t
get_last_resolved_addr(void)
{
return last_resolved_addr;
}
/** Reset last_resolved_addr from outside this file. */
void
reset_last_resolved_addr(void)
{
last_resolved_addr = 0;
}
/* Return true if <b>options</b> is using the default authorities, and false /* Return true if <b>options</b> is using the default authorities, and false
* if any authority-related option has been overridden. */ * if any authority-related option has been overridden. */
int int
@ -2747,278 +2730,6 @@ using_default_dir_authorities(const or_options_t *options)
return (!options->DirAuthorities && !options->AlternateDirAuthority); return (!options->DirAuthorities && !options->AlternateDirAuthority);
} }
/**
* Attempt getting our non-local (as judged by tor_addr_is_internal()
* function) IP address using following techniques, listed in
* order from best (most desirable, try first) to worst (least
* desirable, try if everything else fails).
*
* First, attempt using <b>options-\>Address</b> to get our
* non-local IP address.
*
* If <b>options-\>Address</b> represents a non-local IP address,
* consider it ours.
*
* If <b>options-\>Address</b> is a DNS name that resolves to
* a non-local IP address, consider this IP address ours.
*
* If <b>options-\>Address</b> is NULL, fall back to getting local
* hostname and using it in above-described ways to try and
* get our IP address.
*
* In case local hostname cannot be resolved to a non-local IP
* address, try getting an IP address of network interface
* in hopes it will be non-local one.
*
* Fail if one or more of the following is true:
* - DNS name in <b>options-\>Address</b> cannot be resolved.
* - <b>options-\>Address</b> is a local host address.
* - Attempt at getting local hostname fails.
* - Attempt at getting network interface address fails.
*
* Return 0 if all is well, or -1 if we can't find a suitable
* public IP address.
*
* If we are returning 0:
* - Put our public IP address (in host order) into *<b>addr_out</b>.
* - If <b>method_out</b> is non-NULL, set *<b>method_out</b> to a static
* string describing how we arrived at our answer.
* - "CONFIGURED" - parsed from IP address string in
* <b>options-\>Address</b>
* - "RESOLVED" - resolved from DNS name in <b>options-\>Address</b>
* - "GETHOSTNAME" - resolved from a local hostname.
* - "INTERFACE" - retrieved from a network interface.
* - If <b>hostname_out</b> is non-NULL, and we resolved a hostname to
* get our address, set *<b>hostname_out</b> to a newly allocated string
* holding that hostname. (If we didn't get our address by resolving a
* hostname, set *<b>hostname_out</b> to NULL.)
*
* XXXX ipv6
*/
int
resolve_my_address(int warn_severity, const or_options_t *options,
uint32_t *addr_out,
const char **method_out, char **hostname_out)
{
struct in_addr in;
uint32_t addr; /* host order */
char hostname[256];
const char *method_used;
const char *hostname_used;
int explicit_ip=1;
int explicit_hostname=1;
int from_interface=0;
char *addr_string = NULL;
const char *address = options->Address;
int notice_severity = warn_severity <= LOG_NOTICE ?
LOG_NOTICE : warn_severity;
tor_addr_t myaddr;
tor_assert(addr_out);
/*
* Step one: Fill in 'hostname' to be our best guess.
*/
if (address && *address) {
strlcpy(hostname, address, sizeof(hostname));
} else { /* then we need to guess our address */
explicit_ip = 0; /* it's implicit */
explicit_hostname = 0; /* it's implicit */
if (tor_gethostname(hostname, sizeof(hostname)) < 0) {
log_fn(warn_severity, LD_NET,"Error obtaining local hostname");
return -1;
}
log_debug(LD_CONFIG, "Guessed local host name as '%s'", hostname);
}
/*
* Step two: Now that we know 'hostname', parse it or resolve it. If
* it doesn't parse or resolve, look at the interface address. Set 'addr'
* to be our (host-order) 32-bit answer.
*/
if (tor_inet_aton(hostname, &in) == 0) {
/* then we have to resolve it */
explicit_ip = 0;
if (tor_lookup_hostname(hostname, &addr)) { /* failed to resolve */
uint32_t interface_ip; /* host order */
if (explicit_hostname) {
log_fn(warn_severity, LD_CONFIG,
"Could not resolve local Address '%s'. Failing.", hostname);
return -1;
}
log_fn(notice_severity, LD_CONFIG,
"Could not resolve guessed local hostname '%s'. "
"Trying something else.", hostname);
if (get_interface_address(warn_severity, &interface_ip)) {
log_fn(warn_severity, LD_CONFIG,
"Could not get local interface IP address. Failing.");
return -1;
}
from_interface = 1;
addr = interface_ip;
log_fn(notice_severity, LD_CONFIG, "Learned IP address '%s' for "
"local interface. Using that.", fmt_addr32(addr));
strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
} else { /* resolved hostname into addr */
tor_addr_from_ipv4h(&myaddr, addr);
if (!explicit_hostname &&
tor_addr_is_internal(&myaddr, 0)) {
tor_addr_t interface_ip;
log_fn(notice_severity, LD_CONFIG, "Guessed local hostname '%s' "
"resolves to a private IP address (%s). Trying something "
"else.", hostname, fmt_addr32(addr));
if (get_interface_address6(warn_severity, AF_INET, &interface_ip)<0) {
log_fn(warn_severity, LD_CONFIG,
"Could not get local interface IP address. Too bad.");
} else if (tor_addr_is_internal(&interface_ip, 0)) {
log_fn(notice_severity, LD_CONFIG,
"Interface IP address '%s' is a private address too. "
"Ignoring.", fmt_addr(&interface_ip));
} else {
from_interface = 1;
addr = tor_addr_to_ipv4h(&interface_ip);
log_fn(notice_severity, LD_CONFIG,
"Learned IP address '%s' for local interface."
" Using that.", fmt_addr32(addr));
strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
}
}
}
} else {
addr = ntohl(in.s_addr); /* set addr so that addr_string is not
* illformed */
}
/*
* Step three: Check whether 'addr' is an internal IP address, and error
* out if it is and we don't want that.
*/
tor_addr_from_ipv4h(&myaddr,addr);
addr_string = tor_dup_ip(addr);
if (tor_addr_is_internal(&myaddr, 0)) {
/* make sure we're ok with publishing an internal IP */
if (using_default_dir_authorities(options)) {
/* if they are using the default authorities, disallow internal IPs
* always. For IPv6 ORPorts, this check is done in
* router_get_advertised_ipv6_or_ap(). See #33681. */
log_fn(warn_severity, LD_CONFIG,
"Address '%s' resolves to private IP address '%s'. "
"Tor servers that use the default DirAuthorities must have "
"public IP addresses.", hostname, addr_string);
tor_free(addr_string);
return -1;
}
if (!explicit_ip) {
/* even if they've set their own authorities, require an explicit IP if
* they're using an internal address. */
log_fn(warn_severity, LD_CONFIG, "Address '%s' resolves to private "
"IP address '%s'. Please set the Address config option to be "
"the IP address you want to use.", hostname, addr_string);
tor_free(addr_string);
return -1;
}
}
/*
* Step four: We have a winner! 'addr' is our answer for sure, and
* 'addr_string' is its string form. Fill out the various fields to
* say how we decided it.
*/
log_debug(LD_CONFIG, "Resolved Address to '%s'.", addr_string);
if (explicit_ip) {
method_used = "CONFIGURED";
hostname_used = NULL;
} else if (explicit_hostname) {
method_used = "RESOLVED";
hostname_used = hostname;
} else if (from_interface) {
method_used = "INTERFACE";
hostname_used = NULL;
} else {
method_used = "GETHOSTNAME";
hostname_used = hostname;
}
*addr_out = addr;
if (method_out)
*method_out = method_used;
if (hostname_out)
*hostname_out = hostname_used ? tor_strdup(hostname_used) : NULL;
/*
* Step five: Check if the answer has changed since last time (or if
* there was no last time), and if so call various functions to keep
* us up-to-date.
*/
if (last_resolved_addr && last_resolved_addr != *addr_out) {
/* Leave this as a notice, regardless of the requested severity,
* at least until dynamic IP address support becomes bulletproof. */
log_notice(LD_NET,
"Your IP address seems to have changed to %s "
"(METHOD=%s%s%s). Updating.",
addr_string, method_used,
hostname_used ? " HOSTNAME=" : "",
hostname_used ? hostname_used : "");
ip_address_changed(0);
}
if (last_resolved_addr != *addr_out) {
control_event_server_status(LOG_NOTICE,
"EXTERNAL_ADDRESS ADDRESS=%s METHOD=%s%s%s",
addr_string, method_used,
hostname_used ? " HOSTNAME=" : "",
hostname_used ? hostname_used : "");
}
last_resolved_addr = *addr_out;
/*
* And finally, clean up and return success.
*/
tor_free(addr_string);
return 0;
}
/** Return true iff <b>addr</b> is judged to be on the same network as us, or
* on a private network.
*/
MOCK_IMPL(int,
is_local_addr, (const tor_addr_t *addr))
{
if (tor_addr_is_internal(addr, 0))
return 1;
/* Check whether ip is on the same /24 as we are. */
if (get_options()->EnforceDistinctSubnets == 0)
return 0;
if (tor_addr_family(addr) == AF_INET) {
uint32_t ip = tor_addr_to_ipv4h(addr);
/* It's possible that this next check will hit before the first time
* resolve_my_address actually succeeds. (For clients, it is likely that
* resolve_my_address will never be called at all). In those cases,
* last_resolved_addr will be 0, and so checking to see whether ip is on
* the same /24 as last_resolved_addr will be the same as checking whether
* it was on net 0, which is already done by tor_addr_is_internal.
*/
if ((last_resolved_addr & (uint32_t)0xffffff00ul)
== (ip & (uint32_t)0xffffff00ul))
return 1;
}
return 0;
}
/** Return a new empty or_options_t. Used for testing. */ /** Return a new empty or_options_t. Used for testing. */
or_options_t * or_options_t *
options_new(void) options_new(void)

6
src/app/config/config.h
View file

@ -55,12 +55,6 @@ typedef enum setopt_err_t {
setopt_err_t options_trial_assign(struct config_line_t *list, unsigned flags, setopt_err_t options_trial_assign(struct config_line_t *list, unsigned flags,
char **msg); char **msg);
uint32_t get_last_resolved_addr(void);
void reset_last_resolved_addr(void);
int resolve_my_address(int warn_severity, const or_options_t *options,
uint32_t *addr_out,
const char **method_out, char **hostname_out);
MOCK_DECL(int, is_local_addr, (const tor_addr_t *addr));
void options_init(or_options_t *options); void options_init(or_options_t *options);
#define OPTIONS_DUMP_MINIMAL 1 #define OPTIONS_DUMP_MINIMAL 1

2
src/app/config/include.am
View file

@ -3,6 +3,7 @@
LIBTOR_APP_A_SOURCES += \ LIBTOR_APP_A_SOURCES += \
src/app/config/config.c \ src/app/config/config.c \
src/app/config/quiet_level.c \ src/app/config/quiet_level.c \
src/app/config/resolve_addr.c \
src/app/config/statefile.c src/app/config/statefile.c
# ADD_C_FILE: INSERT HEADERS HERE. # ADD_C_FILE: INSERT HEADERS HERE.
@ -11,6 +12,7 @@ noinst_HEADERS += \
src/app/config/or_options_st.h \ src/app/config/or_options_st.h \
src/app/config/or_state_st.h \ src/app/config/or_state_st.h \
src/app/config/quiet_level.h \ src/app/config/quiet_level.h \
src/app/config/resolve_addr.h \
src/app/config/statefile.h \ src/app/config/statefile.h \
src/app/config/tor_cmdline_mode.h src/app/config/tor_cmdline_mode.h

308
src/app/config/resolve_addr.c Normal file
View file

@ -0,0 +1,308 @@
/* Copyright (c) 2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file resolve_addr.c
* \brief Implement resolving address functions
**/
#define RESOLVE_ADDR_PRIVATE
#include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/mainloop/mainloop.h"
#include "feature/control/control_events.h"
#include "lib/net/gethostname.h"
#include "lib/net/resolve.h"
/** Last value actually set by resolve_my_address. */
static uint32_t last_resolved_addr = 0;
/** Accessor for last_resolved_addr from outside this file. */
uint32_t
get_last_resolved_addr(void)
{
return last_resolved_addr;
}
/** Reset last_resolved_addr from outside this file. */
void
reset_last_resolved_addr(void)
{
last_resolved_addr = 0;
}
/**
* Attempt getting our non-local (as judged by tor_addr_is_internal()
* function) IP address using following techniques, listed in
* order from best (most desirable, try first) to worst (least
* desirable, try if everything else fails).
*
* First, attempt using <b>options-\>Address</b> to get our
* non-local IP address.
*
* If <b>options-\>Address</b> represents a non-local IP address,
* consider it ours.
*
* If <b>options-\>Address</b> is a DNS name that resolves to
* a non-local IP address, consider this IP address ours.
*
* If <b>options-\>Address</b> is NULL, fall back to getting local
* hostname and using it in above-described ways to try and
* get our IP address.
*
* In case local hostname cannot be resolved to a non-local IP
* address, try getting an IP address of network interface
* in hopes it will be non-local one.
*
* Fail if one or more of the following is true:
* - DNS name in <b>options-\>Address</b> cannot be resolved.
* - <b>options-\>Address</b> is a local host address.
* - Attempt at getting local hostname fails.
* - Attempt at getting network interface address fails.
*
* Return 0 if all is well, or -1 if we can't find a suitable
* public IP address.
*
* If we are returning 0:
* - Put our public IP address (in host order) into *<b>addr_out</b>.
* - If <b>method_out</b> is non-NULL, set *<b>method_out</b> to a static
* string describing how we arrived at our answer.
* - "CONFIGURED" - parsed from IP address string in
* <b>options-\>Address</b>
* - "RESOLVED" - resolved from DNS name in <b>options-\>Address</b>
* - "GETHOSTNAME" - resolved from a local hostname.
* - "INTERFACE" - retrieved from a network interface.
* - If <b>hostname_out</b> is non-NULL, and we resolved a hostname to
* get our address, set *<b>hostname_out</b> to a newly allocated string
* holding that hostname. (If we didn't get our address by resolving a
* hostname, set *<b>hostname_out</b> to NULL.)
*
* XXXX ipv6
*/
int
resolve_my_address(int warn_severity, const or_options_t *options,
uint32_t *addr_out,
const char **method_out, char **hostname_out)
{
struct in_addr in;
uint32_t addr; /* host order */
char hostname[256];
const char *method_used;
const char *hostname_used;
int explicit_ip=1;
int explicit_hostname=1;
int from_interface=0;
char *addr_string = NULL;
const char *address = options->Address;
int notice_severity = warn_severity <= LOG_NOTICE ?
LOG_NOTICE : warn_severity;
tor_addr_t myaddr;
tor_assert(addr_out);
/*
* Step one: Fill in 'hostname' to be our best guess.
*/
if (address && *address) {
strlcpy(hostname, address, sizeof(hostname));
} else { /* then we need to guess our address */
explicit_ip = 0; /* it's implicit */
explicit_hostname = 0; /* it's implicit */
if (tor_gethostname(hostname, sizeof(hostname)) < 0) {
log_fn(warn_severity, LD_NET,"Error obtaining local hostname");
return -1;
}
log_debug(LD_CONFIG, "Guessed local host name as '%s'", hostname);
}
/*
* Step two: Now that we know 'hostname', parse it or resolve it. If
* it doesn't parse or resolve, look at the interface address. Set 'addr'
* to be our (host-order) 32-bit answer.
*/
if (tor_inet_aton(hostname, &in) == 0) {
/* then we have to resolve it */
explicit_ip = 0;
if (tor_lookup_hostname(hostname, &addr)) { /* failed to resolve */
uint32_t interface_ip; /* host order */
if (explicit_hostname) {
log_fn(warn_severity, LD_CONFIG,
"Could not resolve local Address '%s'. Failing.", hostname);
return -1;
}
log_fn(notice_severity, LD_CONFIG,
"Could not resolve guessed local hostname '%s'. "
"Trying something else.", hostname);
if (get_interface_address(warn_severity, &interface_ip)) {
log_fn(warn_severity, LD_CONFIG,
"Could not get local interface IP address. Failing.");
return -1;
}
from_interface = 1;
addr = interface_ip;
log_fn(notice_severity, LD_CONFIG, "Learned IP address '%s' for "
"local interface. Using that.", fmt_addr32(addr));
strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
} else { /* resolved hostname into addr */
tor_addr_from_ipv4h(&myaddr, addr);
if (!explicit_hostname &&
tor_addr_is_internal(&myaddr, 0)) {
tor_addr_t interface_ip;
log_fn(notice_severity, LD_CONFIG, "Guessed local hostname '%s' "
"resolves to a private IP address (%s). Trying something "
"else.", hostname, fmt_addr32(addr));
if (get_interface_address6(warn_severity, AF_INET, &interface_ip)<0) {
log_fn(warn_severity, LD_CONFIG,
"Could not get local interface IP address. Too bad.");
} else if (tor_addr_is_internal(&interface_ip, 0)) {
log_fn(notice_severity, LD_CONFIG,
"Interface IP address '%s' is a private address too. "
"Ignoring.", fmt_addr(&interface_ip));
} else {
from_interface = 1;
addr = tor_addr_to_ipv4h(&interface_ip);
log_fn(notice_severity, LD_CONFIG,
"Learned IP address '%s' for local interface."
" Using that.", fmt_addr32(addr));
strlcpy(hostname, "<guessed from interfaces>", sizeof(hostname));
}
}
}
} else {
addr = ntohl(in.s_addr); /* set addr so that addr_string is not
* illformed */
}
/*
* Step three: Check whether 'addr' is an internal IP address, and error
* out if it is and we don't want that.
*/
tor_addr_from_ipv4h(&myaddr,addr);
addr_string = tor_dup_ip(addr);
if (tor_addr_is_internal(&myaddr, 0)) {
/* make sure we're ok with publishing an internal IP */
if (using_default_dir_authorities(options)) {
/* if they are using the default authorities, disallow internal IPs
* always. For IPv6 ORPorts, this check is done in
* router_get_advertised_ipv6_or_ap(). See #33681. */
log_fn(warn_severity, LD_CONFIG,
"Address '%s' resolves to private IP address '%s'. "
"Tor servers that use the default DirAuthorities must have "
"public IP addresses.", hostname, addr_string);
tor_free(addr_string);
return -1;
}
if (!explicit_ip) {
/* even if they've set their own authorities, require an explicit IP if
* they're using an internal address. */
log_fn(warn_severity, LD_CONFIG, "Address '%s' resolves to private "
"IP address '%s'. Please set the Address config option to be "
"the IP address you want to use.", hostname, addr_string);
tor_free(addr_string);
return -1;
}
}
/*
* Step four: We have a winner! 'addr' is our answer for sure, and
* 'addr_string' is its string form. Fill out the various fields to
* say how we decided it.
*/
log_debug(LD_CONFIG, "Resolved Address to '%s'.", addr_string);
if (explicit_ip) {
method_used = "CONFIGURED";
hostname_used = NULL;
} else if (explicit_hostname) {
method_used = "RESOLVED";
hostname_used = hostname;
} else if (from_interface) {
method_used = "INTERFACE";
hostname_used = NULL;
} else {
method_used = "GETHOSTNAME";
hostname_used = hostname;
}
*addr_out = addr;
if (method_out)
*method_out = method_used;
if (hostname_out)
*hostname_out = hostname_used ? tor_strdup(hostname_used) : NULL;
/*
* Step five: Check if the answer has changed since last time (or if
* there was no last time), and if so call various functions to keep
* us up-to-date.
*/
if (last_resolved_addr && last_resolved_addr != *addr_out) {
/* Leave this as a notice, regardless of the requested severity,
* at least until dynamic IP address support becomes bulletproof. */
log_notice(LD_NET,
"Your IP address seems to have changed to %s "
"(METHOD=%s%s%s). Updating.",
addr_string, method_used,
hostname_used ? " HOSTNAME=" : "",
hostname_used ? hostname_used : "");
ip_address_changed(0);
}
if (last_resolved_addr != *addr_out) {
control_event_server_status(LOG_NOTICE,
"EXTERNAL_ADDRESS ADDRESS=%s METHOD=%s%s%s",
addr_string, method_used,
hostname_used ? " HOSTNAME=" : "",
hostname_used ? hostname_used : "");
}
last_resolved_addr = *addr_out;
/*
* And finally, clean up and return success.
*/
tor_free(addr_string);
return 0;
}
/** Return true iff <b>addr</b> is judged to be on the same network as us, or
* on a private network.
*/
MOCK_IMPL(int,
is_local_addr, (const tor_addr_t *addr))
{
if (tor_addr_is_internal(addr, 0))
return 1;
/* Check whether ip is on the same /24 as we are. */
if (get_options()->EnforceDistinctSubnets == 0)
return 0;
if (tor_addr_family(addr) == AF_INET) {
uint32_t ip = tor_addr_to_ipv4h(addr);
/* It's possible that this next check will hit before the first time
* resolve_my_address actually succeeds. (For clients, it is likely that
* resolve_my_address will never be called at all). In those cases,
* last_resolved_addr will be 0, and so checking to see whether ip is on
* the same /24 as last_resolved_addr will be the same as checking whether
* it was on net 0, which is already done by tor_addr_is_internal.
*/
if ((last_resolved_addr & (uint32_t)0xffffff00ul)
== (ip & (uint32_t)0xffffff00ul))
return 1;
}
return 0;
}

28
src/app/config/resolve_addr.h Normal file
View file

@ -0,0 +1,28 @@
/* Copyright (c) 2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file resolve_addr.h
* \brief Header file for resolve_addr.c.
**/
#ifndef TOR_CONFIG_RESOLVE_ADDR_H
#define TOR_CONFIG_RESOLVE_ADDR_H
#include "app/config/or_options_st.h"
int resolve_my_address(int warn_severity, const or_options_t *options,
uint32_t *addr_out,
const char **method_out, char **hostname_out);
uint32_t get_last_resolved_addr(void);
void reset_last_resolved_addr(void);
MOCK_DECL(int, is_local_addr, (const tor_addr_t *addr));
#ifdef RESOLVE_ADDR_PRIVATE
#endif /* RESOLVE_ADDR_PRIVATE */
#endif /* TOR_CONFIG_RESOLVE_ADDR_H */

1
src/core/mainloop/connection.c
View file

@ -67,6 +67,7 @@
*/ */
#define CHANNEL_OBJECT_PRIVATE #define CHANNEL_OBJECT_PRIVATE
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/mainloop/connection.h" #include "core/mainloop/connection.h"
#include "core/mainloop/mainloop.h" #include "core/mainloop/mainloop.h"
#include "core/mainloop/netstatus.h" #include "core/mainloop/netstatus.h"

1
src/core/or/channeltls.c
View file

@ -45,6 +45,7 @@
#include "core/or/circuitmux_ewma.h" #include "core/or/circuitmux_ewma.h"
#include "core/or/command.h" #include "core/or/command.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/mainloop/connection.h" #include "core/mainloop/connection.h"
#include "core/or/connection_or.h" #include "core/or/connection_or.h"
#include "feature/relay/relay_handshake.h" #include "feature/relay/relay_handshake.h"

0
src/core/stA1RajU Normal file
View file

BIN
src/core/stiysZND Normal file
View file

Binary file not shown.

1
src/feature/client/transports.c
View file

@ -97,6 +97,7 @@
#include "core/or/circuitbuild.h" #include "core/or/circuitbuild.h"
#include "feature/client/transports.h" #include "feature/client/transports.h"
#include "feature/relay/router.h" #include "feature/relay/router.h"
#include "feature/relay/relay_find_addr.h"
/* 31851: split the server transport code out of the client module */ /* 31851: split the server transport code out of the client module */
#include "feature/relay/transport_config.h" #include "feature/relay/transport_config.h"
#include "app/config/statefile.h" #include "app/config/statefile.h"

1
src/feature/control/control_getinfo.c
View file

@ -44,6 +44,7 @@
#include "feature/nodelist/nodelist.h" #include "feature/nodelist/nodelist.h"
#include "feature/nodelist/routerinfo.h" #include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h" #include "feature/nodelist/routerlist.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/router.h" #include "feature/relay/router.h"
#include "feature/relay/routermode.h" #include "feature/relay/routermode.h"
#include "feature/relay/selftest.h" #include "feature/relay/selftest.h"

1
src/feature/dirauth/dirauth_config.c
View file

@ -20,6 +20,7 @@
/* Required for dirinfo_type_t in or_options_t */ /* Required for dirinfo_type_t in or_options_t */
#include "core/or/or.h" #include "core/or/or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "feature/dirauth/voting_schedule.h" #include "feature/dirauth/voting_schedule.h"
#include "feature/stats/rephist.h" #include "feature/stats/rephist.h"

1
src/feature/dirauth/dirvote.c
View file

@ -6,6 +6,7 @@
#define DIRVOTE_PRIVATE #define DIRVOTE_PRIVATE
#include "core/or/or.h" #include "core/or/or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/or/policies.h" #include "core/or/policies.h"
#include "core/or/protover.h" #include "core/or/protover.h"
#include "core/or/tor_version_st.h" #include "core/or/tor_version_st.h"

1
src/feature/dircache/dircache.c
View file

@ -13,6 +13,7 @@
#include "core/or/or.h" #include "core/or/or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/mainloop/connection.h" #include "core/mainloop/connection.h"
#include "core/or/relay.h" #include "core/or/relay.h"
#include "feature/dirauth/dirvote.h" #include "feature/dirauth/dirvote.h"

1
src/feature/dirclient/dirclient.c
View file

@ -44,6 +44,7 @@
#include "feature/nodelist/routerinfo.h" #include "feature/nodelist/routerinfo.h"
#include "feature/nodelist/routerlist.h" #include "feature/nodelist/routerlist.h"
#include "feature/nodelist/routerset.h" #include "feature/nodelist/routerset.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/routermode.h" #include "feature/relay/routermode.h"
#include "feature/relay/selftest.h" #include "feature/relay/selftest.h"
#include "feature/rend/rendcache.h" #include "feature/rend/rendcache.h"

1
src/feature/dirclient/dirclient_modes.c
View file

@ -16,6 +16,7 @@
#include "feature/dirclient/dirclient_modes.h" #include "feature/dirclient/dirclient_modes.h"
#include "feature/dircache/dirserv.h" #include "feature/dircache/dirserv.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/router.h" #include "feature/relay/router.h"
#include "feature/relay/routermode.h" #include "feature/relay/routermode.h"
#include "feature/stats/predict_ports.h" #include "feature/stats/predict_ports.h"

1
src/feature/nodelist/dirlist.c
View file

@ -27,6 +27,7 @@
#include "core/or/or.h" #include "core/or/or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/or/policies.h" #include "core/or/policies.h"
#include "feature/control/control_events.h" #include "feature/control/control_events.h"
#include "feature/dirauth/authmode.h" #include "feature/dirauth/authmode.h"

2
src/feature/relay/include.am
View file

@ -2,6 +2,7 @@
# Legacy shared relay code: migrate to the relay module over time # Legacy shared relay code: migrate to the relay module over time
LIBTOR_APP_A_SOURCES += \ LIBTOR_APP_A_SOURCES += \
src/feature/relay/onion_queue.c \ src/feature/relay/onion_queue.c \
src/feature/relay/relay_find_addr.c \
src/feature/relay/router.c src/feature/relay/router.c
# The Relay module. # The Relay module.
@ -31,6 +32,7 @@ noinst_HEADERS += \
src/feature/relay/relay_handshake.h \ src/feature/relay/relay_handshake.h \
src/feature/relay/relay_periodic.h \ src/feature/relay/relay_periodic.h \
src/feature/relay/relay_sys.h \ src/feature/relay/relay_sys.h \
src/feature/relay/relay_find_addr.h \
src/feature/relay/router.h \ src/feature/relay/router.h \
src/feature/relay/routerkeys.h \ src/feature/relay/routerkeys.h \
src/feature/relay/routermode.h \ src/feature/relay/routermode.h \

133
src/feature/relay/relay_find_addr.c Normal file
View file

@ -0,0 +1,133 @@
/* Copyright (c) 2001-2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file relay_find_addr.c
* \brief Implement mechanism for a relay to find its address.
**/
#include "core/or/or.h"
#include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "core/mainloop/mainloop.h"
#include "feature/control/control_events.h"
#include "feature/dircommon/dir_connection_st.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/router.h"
#include "feature/relay/routermode.h"
/** The most recently guessed value of our IP address, based on directory
* headers. */
static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;
/** We failed to resolve our address locally, but we'd like to build
* a descriptor and publish / test reachability. If we have a guess
* about our address based on directory headers, answer it and return
* 0; else return -1. */
static int
router_guess_address_from_dir_headers(uint32_t *guess)
{
if (!tor_addr_is_null(&last_guessed_ip)) {
*guess = tor_addr_to_ipv4h(&last_guessed_ip);
return 0;
}
return -1;
}
/** A directory server <b>d_conn</b> told us our IP address is
* <b>suggestion</b>.
* If this address is different from the one we think we are now, and
* if our computer doesn't actually know its IP address, then switch. */
void
router_new_address_suggestion(const char *suggestion,
const dir_connection_t *d_conn)
{
tor_addr_t addr;
uint32_t cur = 0; /* Current IPv4 address. */
const or_options_t *options = get_options();
/* first, learn what the IP address actually is */
if (tor_addr_parse(&addr, suggestion) == -1) {
log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
escaped(suggestion));
return;
}
log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
if (!server_mode(options)) {
tor_addr_copy(&last_guessed_ip, &addr);
return;
}
/* XXXX ipv6 */
cur = get_last_resolved_addr();
if (cur ||
resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) {
/* We're all set -- we already know our address. Great. */
tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
need it later */
return;
}
if (tor_addr_is_internal(&addr, 0)) {
/* Don't believe anybody who says our IP is, say, 127.0.0.1. */
return;
}
if (tor_addr_eq(&d_conn->base_.addr, &addr)) {
/* Don't believe anybody who says our IP is their IP. */
log_debug(LD_DIR, "A directory server told us our IP address is %s, "
"but they are just reporting their own IP address. Ignoring.",
suggestion);
return;
}
/* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
* us an answer different from what we had the last time we managed to
* resolve it. */
if (!tor_addr_eq(&last_guessed_ip, &addr)) {
control_event_server_status(LOG_NOTICE,
"EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
suggestion);
log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
d_conn->base_.address);
ip_address_changed(0);
tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
will fetch it */
}
}
/** Make a current best guess at our address, either because
* it's configured in torrc, or because we've learned it from
* dirserver headers. Place the answer in *<b>addr</b> and return
* 0 on success, else return -1 if we have no guess.
*
* If <b>cache_only</b> is true, just return any cached answers, and
* don't try to get any new answers.
*/
MOCK_IMPL(int,
router_pick_published_address, (const or_options_t *options, uint32_t *addr,
int cache_only))
{
/* First, check the cached output from resolve_my_address(). */
*addr = get_last_resolved_addr();
if (*addr)
return 0;
/* Second, consider doing a resolve attempt right here. */
if (!cache_only) {
if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL) >= 0) {
log_info(LD_CONFIG,"Success: chose address '%s'.", fmt_addr32(*addr));
return 0;
}
}
/* Third, check the cached output from router_new_address_suggestion(). */
if (router_guess_address_from_dir_headers(addr) >= 0)
return 0;
/* We have no useful cached answers. Return failure. */
return -1;
}

23
src/feature/relay/relay_find_addr.h Normal file
View file

@ -0,0 +1,23 @@
/* Copyright (c) 2020, The Tor Project, Inc. */
/* See LICENSE for licensing information */
/**
* \file relay_find_addr.h
* \brief Header file for relay_find_addr.c.
**/
#ifndef TOR_RELAY_FIND_ADDR_H
#define TOR_RELAY_FIND_ADDR_H
MOCK_DECL(int, router_pick_published_address,
(const or_options_t *options, uint32_t *addr, int cache_only));
void router_new_address_suggestion(const char *suggestion,
const dir_connection_t *d_conn);
#ifdef RELAY_FIND_ADDR_PRIVATE
#endif /* RELAY_FIND_ADDR_PRIVATE */
#endif /* TOR_RELAY_FIND_ADDR_H */

119
src/feature/relay/router.c
View file

@ -8,6 +8,7 @@
#include "core/or/or.h" #include "core/or/or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "app/config/statefile.h" #include "app/config/statefile.h"
#include "app/main/main.h" #include "app/main/main.h"
#include "core/mainloop/connection.h" #include "core/mainloop/connection.h"
@ -36,6 +37,7 @@
#include "feature/nodelist/torcert.h" #include "feature/nodelist/torcert.h"
#include "feature/relay/dns.h" #include "feature/relay/dns.h"
#include "feature/relay/relay_config.h" #include "feature/relay/relay_config.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/router.h" #include "feature/relay/router.h"
#include "feature/relay/routerkeys.h" #include "feature/relay/routerkeys.h"
#include "feature/relay/routermode.h" #include "feature/relay/routermode.h"
@ -1763,41 +1765,6 @@ router_get_descriptor_gen_reason(void)
return desc_gen_reason; return desc_gen_reason;
} }
static int router_guess_address_from_dir_headers(uint32_t *guess);
/** Make a current best guess at our address, either because
* it's configured in torrc, or because we've learned it from
* dirserver headers. Place the answer in *<b>addr</b> and return
* 0 on success, else return -1 if we have no guess.
*
* If <b>cache_only</b> is true, just return any cached answers, and
* don't try to get any new answers.
*/
MOCK_IMPL(int,
router_pick_published_address,(const or_options_t *options, uint32_t *addr,
int cache_only))
{
/* First, check the cached output from resolve_my_address(). */
*addr = get_last_resolved_addr();
if (*addr)
return 0;
/* Second, consider doing a resolve attempt right here. */
if (!cache_only) {
if (resolve_my_address(LOG_INFO, options, addr, NULL, NULL) >= 0) {
log_info(LD_CONFIG,"Success: chose address '%s'.", fmt_addr32(*addr));
return 0;
}
}
/* Third, check the cached output from router_new_address_suggestion(). */
if (router_guess_address_from_dir_headers(addr) >= 0)
return 0;
/* We have no useful cached answers. Return failure. */
return -1;
}
/* Like router_check_descriptor_address_consistency, but specifically for the /* Like router_check_descriptor_address_consistency, but specifically for the
* ORPort or DirPort. * ORPort or DirPort.
* listener_type is either CONN_TYPE_OR_LISTENER or CONN_TYPE_DIR_LISTENER. */ * listener_type is either CONN_TYPE_OR_LISTENER or CONN_TYPE_DIR_LISTENER. */
@ -2523,7 +2490,7 @@ check_descriptor_bandwidth_changed(time_t now)
/** Note at log level severity that our best guess of address has changed from /** Note at log level severity that our best guess of address has changed from
* <b>prev</b> to <b>cur</b>. */ * <b>prev</b> to <b>cur</b>. */
static void void
log_addr_has_changed(int severity, log_addr_has_changed(int severity,
const tor_addr_t *prev, const tor_addr_t *prev,
const tor_addr_t *cur, const tor_addr_t *cur,
@ -2595,86 +2562,6 @@ check_descriptor_ipaddress_changed(time_t now)
tor_free(hostname); tor_free(hostname);
} }
/** The most recently guessed value of our IP address, based on directory
* headers. */
static tor_addr_t last_guessed_ip = TOR_ADDR_NULL;
/** A directory server <b>d_conn</b> told us our IP address is
* <b>suggestion</b>.
* If this address is different from the one we think we are now, and
* if our computer doesn't actually know its IP address, then switch. */
void
router_new_address_suggestion(const char *suggestion,
const dir_connection_t *d_conn)
{
tor_addr_t addr;
uint32_t cur = 0; /* Current IPv4 address. */
const or_options_t *options = get_options();
/* first, learn what the IP address actually is */
if (tor_addr_parse(&addr, suggestion) == -1) {
log_debug(LD_DIR, "Malformed X-Your-Address-Is header %s. Ignoring.",
escaped(suggestion));
return;
}
log_debug(LD_DIR, "Got X-Your-Address-Is: %s.", suggestion);
if (!server_mode(options)) {
tor_addr_copy(&last_guessed_ip, &addr);
return;
}
/* XXXX ipv6 */
cur = get_last_resolved_addr();
if (cur ||
resolve_my_address(LOG_INFO, options, &cur, NULL, NULL) >= 0) {
/* We're all set -- we already know our address. Great. */
tor_addr_from_ipv4h(&last_guessed_ip, cur); /* store it in case we
need it later */
return;
}
if (tor_addr_is_internal(&addr, 0)) {
/* Don't believe anybody who says our IP is, say, 127.0.0.1. */
return;
}
if (tor_addr_eq(&d_conn->base_.addr, &addr)) {
/* Don't believe anybody who says our IP is their IP. */
log_debug(LD_DIR, "A directory server told us our IP address is %s, "
"but they are just reporting their own IP address. Ignoring.",
suggestion);
return;
}
/* Okay. We can't resolve our own address, and X-Your-Address-Is is giving
* us an answer different from what we had the last time we managed to
* resolve it. */
if (!tor_addr_eq(&last_guessed_ip, &addr)) {
control_event_server_status(LOG_NOTICE,
"EXTERNAL_ADDRESS ADDRESS=%s METHOD=DIRSERV",
suggestion);
log_addr_has_changed(LOG_NOTICE, &last_guessed_ip, &addr,
d_conn->base_.address);
ip_address_changed(0);
tor_addr_copy(&last_guessed_ip, &addr); /* router_rebuild_descriptor()
will fetch it */
}
}
/** We failed to resolve our address locally, but we'd like to build
* a descriptor and publish / test reachability. If we have a guess
* about our address based on directory headers, answer it and return
* 0; else return -1. */
static int
router_guess_address_from_dir_headers(uint32_t *guess)
{
if (!tor_addr_is_null(&last_guessed_ip)) {
*guess = tor_addr_to_ipv4h(&last_guessed_ip);
return 0;
}
return -1;
}
/** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short /** Set <b>platform</b> (max length <b>len</b>) to a NUL-terminated short
* string describing the version of Tor and the operating system we're * string describing the version of Tor and the operating system we're
* currently running on. * currently running on.

8
src/feature/relay/router.h
View file

@ -87,8 +87,6 @@ void mark_my_descriptor_dirty(const char *reason);
void check_descriptor_bandwidth_changed(time_t now); void check_descriptor_bandwidth_changed(time_t now);
void check_descriptor_ipaddress_changed(time_t now); void check_descriptor_ipaddress_changed(time_t now);
int router_has_bandwidth_to_be_dirserver(const or_options_t *options); int router_has_bandwidth_to_be_dirserver(const or_options_t *options);
void router_new_address_suggestion(const char *suggestion,
const dir_connection_t *d_conn);
int router_compare_to_my_exit_policy(const tor_addr_t *addr, uint16_t port); int router_compare_to_my_exit_policy(const tor_addr_t *addr, uint16_t port);
MOCK_DECL(int, router_my_exit_policy_is_reject_star,(void)); MOCK_DECL(int, router_my_exit_policy_is_reject_star,(void));
MOCK_DECL(const routerinfo_t *, router_get_my_routerinfo, (void)); MOCK_DECL(const routerinfo_t *, router_get_my_routerinfo, (void));
@ -100,9 +98,6 @@ int router_digest_is_me(const char *digest);
const uint8_t *router_get_my_id_digest(void); const uint8_t *router_get_my_id_digest(void);
int router_extrainfo_digest_is_me(const char *digest); int router_extrainfo_digest_is_me(const char *digest);
int router_is_me(const routerinfo_t *router); int router_is_me(const routerinfo_t *router);
MOCK_DECL(int,router_pick_published_address,(const or_options_t *options,
uint32_t *addr,
int cache_only));
int router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e); int router_build_fresh_descriptor(routerinfo_t **r, extrainfo_t **e);
int router_rebuild_descriptor(int force); int router_rebuild_descriptor(int force);
char *router_dump_router_to_string(routerinfo_t *router, char *router_dump_router_to_string(routerinfo_t *router,
@ -120,6 +115,9 @@ int extrainfo_dump_to_string(char **s, extrainfo_t *extrainfo,
const char *routerinfo_err_to_string(int err); const char *routerinfo_err_to_string(int err);
int routerinfo_err_is_transient(int err); int routerinfo_err_is_transient(int err);
void log_addr_has_changed(int severity, const tor_addr_t *prev,
const tor_addr_t *cur, const char *source);
void router_reset_warnings(void); void router_reset_warnings(void);
void router_free_all(void); void router_free_all(void);

1
src/test/test_channeltls.c
View file

@ -14,6 +14,7 @@
#include "core/mainloop/connection.h" #include "core/mainloop/connection.h"
#include "core/or/connection_or.h" #include "core/or/connection_or.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
/* For init/free stuff */ /* For init/free stuff */
#include "core/or/scheduler.h" #include "core/or/scheduler.h"
#include "lib/tls/tortls.h" #include "lib/tls/tortls.h"

2
src/test/test_config.c
View file

@ -18,6 +18,7 @@
#include "core/or/circuitmux_ewma.h" #include "core/or/circuitmux_ewma.h"
#include "core/or/circuitbuild.h" #include "core/or/circuitbuild.h"
#include "app/config/config.h" #include "app/config/config.h"
#include "app/config/resolve_addr.h"
#include "feature/relay/relay_config.h" #include "feature/relay/relay_config.h"
#include "feature/relay/transport_config.h" #include "feature/relay/transport_config.h"
#include "lib/confmgt/confmgt.h" #include "lib/confmgt/confmgt.h"
@ -42,6 +43,7 @@
#include "core/or/policies.h" #include "core/or/policies.h"
#include "feature/rend/rendclient.h" #include "feature/rend/rendclient.h"
#include "feature/rend/rendservice.h" #include "feature/rend/rendservice.h"
#include "feature/relay/relay_find_addr.h"
#include "feature/relay/router.h" #include "feature/relay/router.h"
#include "feature/relay/routermode.h" #include "feature/relay/routermode.h"
#include "feature/nodelist/dirlist.h" #include "feature/nodelist/dirlist.h"