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Separate reverse-virtual-address-map entries into ipv4 and hostname slots. Otherwise if you ask me to map "some IPv4 address" to foo.onion, I might tell you that I already mapped "bar.virtual" to foo.onion

Browse Source 
svn:r3730
This commit is contained in:
Nick Mathewson 2005-03-02 22:01:10 +00:00
parent 5315b61e13
commit 4b5e213a0b
1 changed files with 66 additions and 26 deletions
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92
src/or/connection_edge.c
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@ -364,9 +364,23 @@ typedef struct {
int num_resolve_failures;
} addressmap_entry_t;
typedef struct {
char *ipv4_address;
char *hostname_address;
} virtaddress_entry_t;
/** The tree of client-side address rewrite instructions. */
static strmap_t *addressmap;
/** Tree mapping addresses to which virtual address we assigned them to. */
/**
* Tree mapping addresses to which virtual address, if any, we
* assigned them to.
*
* We maintain the following invariant: if [A,B] is in
* virtaddress_reversemap, then B must be a virtual address, and [A,B]
* must be in addressmap. We do not require that the converse hold:
* if it fails, then we could end up mapping two virtual addresses to
* the same address, which is no disaster.
**/
static strmap_t *virtaddress_reversemap;
/** Initialize addressmap. */
@ -384,18 +398,38 @@ addressmap_ent_free(void *_ent) {
}
static void
addressmap_ent_remove(const char *addr, addressmap_entry_t *ent)
{
if (ent && address_is_in_virtual_range(ent->new_address)) {
if (!strcasecmp(addr,
strmap_get(virtaddress_reversemap, ent->new_address))) {
char *a = strmap_remove(virtaddress_reversemap, ent->new_address);
tor_free(a);
}
}
addressmap_ent_free(ent);
addressmap_virtaddress_ent_free(void *_ent) {
virtaddress_entry_t *ent = _ent;
tor_free(ent->ipv4_address);
tor_free(ent->hostname_address);
tor_free(ent);
}
static void
addressmap_virtaddress_remove(const char *addr, addressmap_entry_t *ent)
{
if (ent && address_is_in_virtual_range(ent->new_address)) {
virtaddress_entry_t *ve =
strmap_get(virtaddress_reversemap, ent->new_address);
if (ve) {
if (!strcmp(addr, ve->ipv4_address))
tor_free(ve->ipv4_address);
if (!strcmp(addr, ve->hostname_address))
tor_free(ve->hostname_address);
if (!ve->ipv4_address && !ve->hostname_address) {
tor_free(ve);
strmap_remove(virtaddress_reversemap, ent->new_address);
}
}
}
}
static void
addressmap_ent_remove(const char *addr, addressmap_entry_t *ent)
{
addressmap_virtaddress_remove(addr, ent);
addressmap_ent_free(ent);
}
/** A helper function for addressmap_clean() below. If ent is too old,
* then remove it from the tree and return NULL, else return ent.
@ -427,7 +461,7 @@ void addressmap_clean(time_t now) {
void addressmap_free_all(void) {
strmap_free(addressmap, addressmap_ent_free);
addressmap = NULL;
strmap_free(virtaddress_reversemap, free);
strmap_free(virtaddress_reversemap, addressmap_virtaddress_ent_free);
}
/** Look at address, and rewrite it until it doesn't want any
@ -486,11 +520,8 @@ void addressmap_register(const char *address, char *new_address, time_t expires)
return;
}
if (ent) { /* we'll replace it */
if (address_is_in_virtual_range(ent->new_address) &&
!strcasecmp(address,
strmap_get(virtaddress_reversemap, ent->new_address))) {
char *a = strmap_remove(virtaddress_reversemap, ent->new_address);
tor_free(a);
if (address_is_in_virtual_range(ent->new_address)) {
addressmap_virtaddress_remove(address, ent);
}
tor_free(ent->new_address);
} else { /* make a new one and register it */
@ -634,22 +665,31 @@ addressmap_get_virtual_address(int type)
char *
addressmap_register_virtual_address(int type, char *new_address)
{
char *addr;
char **addrp;
virtaddress_entry_t *vent;
tor_assert(new_address);
if ((addr = strmap_get(virtaddress_reversemap, new_address))) {
addressmap_entry_t *ent = strmap_get(addressmap, addr);
vent = strmap_get(virtaddress_reversemap, new_address);
if (!vent)
vent = tor_malloc_zero(sizeof(virtaddress_entry_t));
addrp = (type == RESOLVED_TYPE_IPV4) ?
&vent->ipv4_address : &vent->hostname_address;
if (*addrp) {
addressmap_entry_t *ent = strmap_get(addressmap, *addrp);
if (!strcasecmp(new_address, ent->new_address))
return tor_strdup(addr);
return tor_strdup(*addrp);
else
log_fn(LOG_WARN, "Internal confusion: I thought that '%s' was mapped to by '%s', but '%s' really maps to '%s'. This is a harmless bug.",
new_address, addr, addr, ent->new_address);
new_address, *addrp, *addrp, ent->new_address);
}
addr = addressmap_get_virtual_address(type);
strmap_set(virtaddress_reversemap, new_address, tor_strdup(addr));
addressmap_register(addr, new_address, 0);
return addr;
tor_free(*addrp);
*addrp = addressmap_get_virtual_address(type);
strmap_set(virtaddress_reversemap, new_address, tor_strdup(*addrp));
addressmap_register(*addrp, new_address, 0);
return *addrp;
}
/** Return 1 if <b>address</b> has funny characters in it like