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Handle a NULL return from addressmap_get_virtual_address

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Fix for bug 2328; bugfix on 0.1.2.1-alpha; bug found by doorss.
This commit is contained in:
Nick Mathewson 2011-01-05 16:36:48 -05:00
parent 31d6659d97
commit eabddd8ca0
2 changed files with 25 additions and 5 deletions
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6
changes/bug2328
View File

@ -1,4 +1,8 @@
o Minor bugfixes
- Fix a bug where we would declare that we had run out of virtual
addresses when the address space was only half-exhausted. Bugfix
on 0.1.1.19-rc.
on 0.1.2.1-alpha.
- Correctly handle the case where AutomapHostsOnResolve is set but no
virtual addresses are available. Fixes bug2328, bugfix on
0.1.2.1-alpha. Bug found by doorss.

24
src/or/connection_edge.c
View File

@ -1142,6 +1142,8 @@ address_is_in_virtual_range(const char *address)
/** Return a newly allocated string holding an address of <b>type</b>
* (one of RESOLVED_TYPE_{IPV4|HOSTNAME}) that has not yet been mapped,
* and that is very unlikely to be the address of any real host.
*
* May return NULL if we have run out of virtual addresses.
*/
static char *
addressmap_get_virtual_address(int type)
@ -1199,14 +1201,15 @@ addressmap_get_virtual_address(int type)
* allocated string. If another address of the same type is already
* mapped to <b>new_address</b>, try to return a copy of that address.
*
* The string in <b>new_address</b> may be freed, or inserted into a map
* as appropriate.
* The string in <b>new_address</b> may be freed or inserted into a map
* as appropriate. May return NULL if are out of virtual addresses.
**/
const char *
addressmap_register_virtual_address(int type, char *new_address)
{
char **addrp;
virtaddress_entry_t *vent;
int vent_needs_to_be_added = 0;
tor_assert(new_address);
tor_assert(addressmap);
@ -1215,7 +1218,7 @@ addressmap_register_virtual_address(int type, char *new_address)
vent = strmap_get(virtaddress_reversemap, new_address);
if (!vent) {
vent = tor_malloc_zero(sizeof(virtaddress_entry_t));
strmap_set(virtaddress_reversemap, new_address, vent);
vent_needs_to_be_added = 1;
}
addrp = (type == RESOLVED_TYPE_IPV4) ?
@ -1225,6 +1228,7 @@ addressmap_register_virtual_address(int type, char *new_address)
if (ent && ent->new_address &&
!strcasecmp(new_address, ent->new_address)) {
tor_free(new_address);
tor_assert(!vent_needs_to_be_added);
return tor_strdup(*addrp);
} else
log_warn(LD_BUG,
@ -1236,7 +1240,14 @@ addressmap_register_virtual_address(int type, char *new_address)
tor_free(*addrp);
*addrp = addressmap_get_virtual_address(type);
if (!*addrp) {
tor_free(vent);
tor_free(new_address);
return NULL;
}
log_info(LD_APP, "Registering map from %s to %s", *addrp, new_address);
if (vent_needs_to_be_added)
strmap_set(virtaddress_reversemap, new_address, vent);
addressmap_register(*addrp, new_address, 2, ADDRMAPSRC_CONTROLLER);
#if 0
@ -1415,7 +1426,12 @@ connection_ap_handshake_rewrite_and_attach(edge_connection_t *conn,
const char *new_addr;
new_addr = addressmap_register_virtual_address(
RESOLVED_TYPE_IPV4, tor_strdup(socks->address));
tor_assert(new_addr);
if (! new_addr) {
log_warn(LD_APP, "Unable to automap address %s",
escaped_safe_str(socks->address));
connection_mark_unattached_ap(conn, END_STREAM_REASON_INTERNAL);
return -1;
}
log_info(LD_APP, "Automapping %s to %s",
escaped_safe_str(socks->address), safe_str(new_addr));
strlcpy(socks->address, new_addr, sizeof(socks->address));