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Fix check for failed evdns request creation

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When using libevent 2, we use evdns_base_resolve_*().  When not, we
fake evdns_base_resolve_*() using evdns_resolve_*().

Our old check was looking for negative values (like libevent 2
returns), but our eventdns.c code returns 1.  This code makes the
check just test for nonzero.

Note that this broken check was not for _resolve_ failures or even for
failures to _launch_ a resolve: it was for failures to _create_ or
_encode_ a resolve request.

Bug introduced in 81eee0ecfff3dac1e9438719d2f7dc0ba7e84a71; found by
lodger; uploaded to trac by rransom.  Bug 2363.  Fix on 0.2.2.6-alpha.
This commit is contained in:
Nick Mathewson
2011-01-09 18:54:45 -05:00
parent 732275bb81
commit 68d5b6bc52
2 changed files with 13 additions and 3 deletions
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changes/bug2363
+6
View File
@@ -0,0 +1,6 @@
o Minor bugfixes
- Correctly detect failures to create DNS requests when using Libevent
versions before v2. (Before Libevent 2, we used our own evdns
implementation. Its return values for Libevent's evdns_resolve_*()
functions are not consistent with those from Libevent.) Found by
Lodger; fixes bug 2363; bugfix on 0.2.2.6-alpha.
src/or/dns.c
+7 -3
View File
@@ -54,12 +54,16 @@ struct evdns_request;
evdns_config_windows_nameservers()
#define evdns_base_set_option_(base, opt, val) \
evdns_set_option((opt),(val),DNS_OPTIONS_ALL)
/* Note: our internal eventdns.c, plus libevent 1.4, used a 1 return to
* signify failure to launch a resolve. Libevent 2.0 uses a -1 return to
* signify a failure on a resolve, though if we're on libevent 2.0, we should
* have event2/dns.h and never hit these macros. Regardless, 0 is success. */
#define evdns_base_resolve_ipv4(base, addr, options, cb, ptr) \
((evdns_resolve_ipv4(addr, options, cb, ptr)<0) ? NULL : ((void*)1))
((evdns_resolve_ipv4(addr, options, cb, ptr)!=0) ? NULL : ((void*)1))
#define evdns_base_resolve_reverse(base, addr, options, cb, ptr) \
((evdns_resolve_reverse(addr, options, cb, ptr)<0) ? NULL : ((void*)1))
((evdns_resolve_reverse(addr, options, cb, ptr)!=0) ? NULL : ((void*)1))
#define evdns_base_resolve_reverse_ipv6(base, addr, options, cb, ptr) \
((evdns_resolve_reverse_ipv6(addr, options, cb, ptr)<0) ? NULL : ((void*)1))
((evdns_resolve_reverse_ipv6(addr, options, cb, ptr)!=0) ? NULL : ((void*)1))
#elif defined(LIBEVENT_VERSION_NUMBER) && LIBEVENT_VERSION_NUMBER < 0x02000303
#define evdns_base_set_option_(base, opt, val) \