};
+/**
+ * Information we keep during the resolution of an
+ * IP address for a DNS server while handling a
+ * GNS2DNS record.
+ */
+struct Gns2DnsContext
+{
+
+ /**
+ * DNS domain in which the resolution will continue
+ * (first part of the GNS2DNS record).
+ */
+ char *ns;
+
+ /**
+ * Handle for the resolution of the IP part of the
+ * GNS2DNS record. Will return to us the addresses
+ * of the DNS resolver to use.
+ */
+ struct GNS_ResolverHandle *rh;
+
+};
+
+
/**
* Handle to a currenty pending resolution. On result (positive or
* negative) the #GNS_ResultProcessor is called.
GNS_ResultProcessor proc;
/**
- * closure passed to proc
+ * closure passed to @e proc
*/
void* proc_cls;
+ /**
+ * Handle used during GNS2DNS resolution for looking up the
+ * IP address of the DNS server.
+ */
+ struct Gns2DnsContext *g2dc;
+
/**
* Handle for DHT lookups. should be NULL if no lookups are in progress
*/
continue;
}
}
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Returning DNS response for `%s' with %u answers\n",
+ rh->ac_tail->label,
+ (unsigned int) p->num_answers);
rh->proc (rh->proc_cls, rd_count - skip, rd);
GNS_resolver_lookup_cancel (rh);
}
ac->label = resolver_lookup_get_next_label (rh);
/* tigger shortening */
if (NULL != rh->shorten_key)
+ {
+ GNUNET_break (0); /* FIXME suggested label*/
GNS_shorten_start (rh->ac_tail->label,
+ NULL,
&ac->authority_info.gns_authority,
rh->shorten_key);
+ }
/* add AC to tail */
GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
rh->ac_tail,
}
+/**
+ * We've resolved the IP address for the DNS resolver to use
+ * after encountering a GNS2DNS record.
+ *
+ * TODO: Right now we only foward the request to ONE DNS resolver,
+ * even if we get multiple IP addresses back; a correct implementation
+ * should try all DNS resolvers.
+ *
+ * @param cls the `struct GNS_ResolverHandle` where we encountered
+ * the GNS2DNS record
+ * @param rd_count number of records in @a rd
+ * @param rd addresses for the DNS resolver (presumably)
+ */
+static void
+handle_gns2dns_result (void *cls,
+ unsigned int rd_count,
+ const struct GNUNET_GNSRECORD_Data *rd)
+{
+ struct GNS_ResolverHandle *rh = cls;
+ struct AuthorityChain *ac;
+ unsigned int j;
+ struct sockaddr *sa;
+ struct sockaddr_in v4;
+ struct sockaddr_in6 v6;
+ size_t sa_len;
+
+ /* find suitable A/AAAA record */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Received %u results for IP address of DNS server for GNS2DNS transition\n",
+ rd_count);
+ /* enable cleanup of 'rh' handle that comes next... */
+ GNUNET_CONTAINER_DLL_insert (rlh_head,
+ rlh_tail,
+ rh->g2dc->rh);
+ rh->g2dc->rh = NULL;
+ sa = NULL;
+ sa_len = 0;
+ for (j=0;j<rd_count;j++)
+ {
+ switch (rd[j].record_type)
+ {
+ case GNUNET_DNSPARSER_TYPE_A:
+ if (sizeof (struct in_addr) != rd[j].data_size)
+ {
+ GNUNET_break_op (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ /* FIXME: might want to check if we support IPv4 here,
+ and otherwise skip this one and hope we find another */
+ memset (&v4, 0, sizeof (v4));
+ sa_len = sizeof (v4);
+ v4.sin_family = AF_INET;
+ v4.sin_port = htons (53);
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v4.sin_len = (u_char) sa_len;
+#endif
+ memcpy (&v4.sin_addr,
+ rd[j].data,
+ sizeof (struct in_addr));
+ sa = (struct sockaddr *) &v4;
+ break;
+ case GNUNET_DNSPARSER_TYPE_AAAA:
+ if (sizeof (struct in6_addr) != rd[j].data_size)
+ {
+ GNUNET_break_op (0);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ /* FIXME: might want to check if we support IPv6 here,
+ and otherwise skip this one and hope we find another */
+ memset (&v6, 0, sizeof (v6));
+ sa_len = sizeof (v6);
+ v6.sin6_family = AF_INET6;
+ v6.sin6_port = htons (53);
+#if HAVE_SOCKADDR_IN_SIN_LEN
+ v6.sin6_len = (u_char) sa_len;
+#endif
+ memcpy (&v6.sin6_addr,
+ rd[j].data,
+ sizeof (struct in6_addr));
+ sa = (struct sockaddr *) &v6;
+ break;
+ default:
+ break;
+ }
+ if (NULL != sa)
+ break;
+ }
+ if (NULL == sa)
+ {
+ /* we cannot continue; NS without A/AAAA */
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ /* expand authority chain */
+ ac = GNUNET_new (struct AuthorityChain);
+ ac->rh = rh;
+ strcpy (ac->authority_info.dns_authority.name,
+ rh->g2dc->ns);
+ memcpy (&ac->authority_info.dns_authority.dns_ip,
+ sa,
+ sa_len);
+ /* for DNS recursion, the label is the full DNS name,
+ created from the remainder of the GNS name and the
+ name in the NS record */
+ GNUNET_asprintf (&ac->label,
+ "%.*s%s%s",
+ (int) rh->name_resolution_pos,
+ rh->name,
+ (0 != rh->name_resolution_pos) ? "." : "",
+ rh->g2dc->ns);
+ GNUNET_free (rh->g2dc->ns);
+ GNUNET_free (rh->g2dc);
+ rh->g2dc = NULL;
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Will continue resolution using DNS server `%s' to resolve `%s'\n",
+ GNUNET_a2s (sa, sa_len),
+ ac->label);
+ GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
+ rh->ac_tail,
+ ac);
+ if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
+ {
+ GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
+ _("GNS lookup resulted in DNS name that is too long (`%s')\n"),
+ ac->label);
+ rh->proc (rh->proc_cls, 0, NULL);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ /* recurse */
+ rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
+ rh);
+}
+
+
/**
* Process a records that were decrypted from a block.
*
struct GNS_ResolverHandle *rh = cls;
struct AuthorityChain *ac;
unsigned int i;
- unsigned int j;
- struct sockaddr *sa;
- struct sockaddr_in v4;
- struct sockaddr_in6 v6;
- size_t sa_len;
char *cname;
struct VpnContext *vpn_ctx;
const struct GNUNET_TUN_GnsVpnRecord *vpn;
const char *vname;
+ const char *suggested_label;
struct GNUNET_HashCode vhash;
int af;
char scratch[UINT16_MAX];
size_t scratch_off;
size_t scratch_start;
size_t off;
+ int c2;
struct GNUNET_GNSRECORD_Data rd_new[rd_count];
unsigned int rd_off;
case GNUNET_GNSRECORD_TYPE_GNS2DNS:
{
/* delegation to DNS */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Found GNS2DNS record, delegating to DNS!\n");
goto do_recurse;
}
default:
/* tigger shortening */
if (NULL != rh->shorten_key)
{
- GNS_shorten_start (rh->ac_tail->label,
+ suggested_label = NULL;
+ for (c2 = 0; c2< rd_count; c2++)
+ {
+ if ((GNUNET_GNSRECORD_TYPE_NICK ==rd[c2].record_type) &&
+ (rd[i].data_size > 0) &&
+ (((const char *) rd[c2].data)[rd[c2].data_size -1] == '\0'))
+ suggested_label = (const char *) rd->data;
+ }
+ if (NULL != suggested_label)
+ GNS_shorten_start (rh->ac_tail->label,
+ suggested_label,
&pub,
rh->shorten_key);
}
}
}
break;
+ case GNUNET_GNSRECORD_TYPE_GNS2DNS:
+ {
+ /* delegation to DNS */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Found GNS2DNS record, delegating to DNS!\n");
+ goto do_recurse;
+ }
default:
rd_off++;
break;
}
/* yes, we are done, return result */
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Returning GNS response for `%s' with %u answers\n",
+ rh->ac_tail->label,
+ rd_off);
rh->proc (rh->proc_cls, rd_off, rd_new);
GNS_resolver_lookup_cancel (rh);
return;
ac->label = resolver_lookup_get_next_label (rh);
/* tigger shortening */
if (NULL != rh->shorten_key)
- GNS_shorten_start (rh->ac_tail->label,
+ {
+ suggested_label = NULL;
+ for (c2 = 0; c2< rd_count; c2++)
+ {
+ if ((GNUNET_GNSRECORD_TYPE_NICK ==rd[c2].record_type) &&
+ (rd[c2].data_size > 0) &&
+ ((const char *) rd[c2].data)[rd[c2].data_size -1] == '\0')
+ suggested_label = (const char *) rd[c2].data;
+ }
+ if (NULL != suggested_label)
+ GNS_shorten_start (rh->ac_tail->label,
+ suggested_label,
&ac->authority_info.gns_authority,
rh->shorten_key);
+ }
/* add AC to tail */
GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
rh->ac_tail,
return;
case GNUNET_GNSRECORD_TYPE_GNS2DNS:
{
- char *ns;
/* resolution continues within DNS */
- if (GNUNET_DNSPARSER_MAX_NAME_LENGTH < rd[i].data_size)
- {
- GNUNET_break_op (0);
- rh->proc (rh->proc_cls, 0, NULL);
- GNS_resolver_lookup_cancel (rh);
- return;
- }
- /* find associated A/AAAA record */
- sa = NULL;
- sa_len = 0;
- for (j=0;j<rd_count;j++)
- {
- switch (rd[j].record_type)
- {
- case GNUNET_DNSPARSER_TYPE_A:
- if (sizeof (struct in_addr) != rd[j].data_size)
- {
- GNUNET_break_op (0);
- rh->proc (rh->proc_cls, 0, NULL);
- GNS_resolver_lookup_cancel (rh);
- return;
- }
- /* FIXME: might want to check if we support IPv4 here,
- and otherwise skip this one and hope we find another */
- memset (&v4, 0, sizeof (v4));
- sa_len = sizeof (v4);
- v4.sin_family = AF_INET;
- v4.sin_port = htons (53);
-#if HAVE_SOCKADDR_IN_SIN_LEN
- v4.sin_len = (u_char) sa_len;
-#endif
- memcpy (&v4.sin_addr,
- rd[j].data,
- sizeof (struct in_addr));
- sa = (struct sockaddr *) &v4;
- break;
- case GNUNET_DNSPARSER_TYPE_AAAA:
- if (sizeof (struct in6_addr) != rd[j].data_size)
- {
- GNUNET_break_op (0);
- rh->proc (rh->proc_cls, 0, NULL);
- GNS_resolver_lookup_cancel (rh);
- return;
- }
- /* FIXME: might want to check if we support IPv6 here,
- and otherwise skip this one and hope we find another */
- memset (&v6, 0, sizeof (v6));
- sa_len = sizeof (v6);
- v6.sin6_family = AF_INET6;
- v6.sin6_port = htons (53);
-#if HAVE_SOCKADDR_IN_SIN_LEN
- v6.sin6_len = (u_char) sa_len;
-#endif
- memcpy (&v6.sin6_addr,
- rd[j].data,
- sizeof (struct in6_addr));
- sa = (struct sockaddr *) &v6;
- break;
- default:
- break;
- }
- if (NULL != sa)
- break;
- }
- if (NULL == sa)
- {
- /* we cannot continue; NS without A/AAAA */
- rh->proc (rh->proc_cls, 0, NULL);
- GNS_resolver_lookup_cancel (rh);
- return;
- }
- /* expand authority chain */
- ac = GNUNET_new (struct AuthorityChain);
- ac->rh = rh;
- off = 0;
- ns = GNUNET_DNSPARSER_parse_name (rd[i].data,
- rd[i].data_size,
- &off);
- if ( (NULL == ns) ||
- (off != rd[i].data_size) )
- {
- GNUNET_break_op (0); /* record not well-formed */
- rh->proc (rh->proc_cls, 0, NULL);
- GNS_resolver_lookup_cancel (rh);
- GNUNET_free_non_null (ns);
- GNUNET_free (ac);
- return;
- }
- strcpy (ac->authority_info.dns_authority.name,
- ns);
- memcpy (&ac->authority_info.dns_authority.dns_ip,
- sa,
- sa_len);
- /* for DNS recursion, the label is the full DNS name,
- created from the remainder of the GNS name and the
- name in the NS record */
- GNUNET_asprintf (&ac->label,
- "%.*s%s%s",
- (int) rh->name_resolution_pos,
- rh->name,
- (0 != rh->name_resolution_pos) ? "." : "",
- ns);
- GNUNET_free (ns);
- GNUNET_CONTAINER_DLL_insert_tail (rh->ac_head,
- rh->ac_tail,
- ac);
- if (strlen (ac->label) > GNUNET_DNSPARSER_MAX_NAME_LENGTH)
- {
- GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
- _("GNS lookup resulted in DNS name that is too long (`%s')\n"),
- ac->label);
+ struct Gns2DnsContext *g2dc;
+ char *ip;
+ char *ns;
+
+ off = 0;
+ ns = GNUNET_DNSPARSER_parse_name (rd[i].data,
+ rd[i].data_size,
+ &off);
+ ip = GNUNET_DNSPARSER_parse_name (rd[i].data,
+ rd[i].data_size,
+ &off);
+ if ( (NULL == ns) ||
+ (NULL == ip) ||
+ (off != rd[i].data_size) )
+ {
+ GNUNET_break_op (0);
+ GNUNET_free_non_null (ns);
+ GNUNET_free_non_null (ip);
rh->proc (rh->proc_cls, 0, NULL);
GNS_resolver_lookup_cancel (rh);
- return;
- }
- /* recurse */
- rh->task_id = GNUNET_SCHEDULER_add_now (&recursive_resolution,
- rh);
+ return;
+ }
+ GNUNET_log (GNUNET_ERROR_TYPE_DEBUG,
+ "Resolving `%s' to determine IP address of DNS server for GNS2DNS transition\n",
+ ip);
+ /* resolve 'ip' to determine the IP(s) of the DNS
+ resolver to use */
+ g2dc = GNUNET_new (struct Gns2DnsContext);
+ g2dc->ns = ns;
+ g2dc->rh = GNUNET_new (struct GNS_ResolverHandle);
+ g2dc->rh->authority_zone = rh->ac_tail->authority_info.gns_authority;
+ ip = translate_dot_plus (rh, ip);
+ g2dc->rh->name = ip;
+ g2dc->rh->name_resolution_pos = strlen (ip);
+ g2dc->rh->proc = &handle_gns2dns_result;
+ g2dc->rh->proc_cls = rh;
+ g2dc->rh->record_type = GNUNET_GNSRECORD_TYPE_ANY;
+ g2dc->rh->only_cached = GNUNET_NO;
+ g2dc->rh->loop_limiter = rh->loop_limiter + 1;
+ rh->g2dc = g2dc;
+ start_resolver_lookup (g2dc->rh);
return;
}
case GNUNET_DNSPARSER_TYPE_CNAME:
start_resolver_lookup (struct GNS_ResolverHandle *rh)
{
struct AuthorityChain *ac;
- char *x;
char *y;
- char *pkey;
+ struct in_addr v4;
+ struct in6_addr v6;
+ if (1 == inet_pton (AF_INET,
+ rh->name,
+ &v4))
+ {
+ /* name is IPv4 address, pretend it's an A record */
+ struct GNUNET_GNSRECORD_Data rd;
+
+ rd.data = &v4;
+ rd.data_size = sizeof (v4);
+ rd.expiration_time = UINT64_MAX;
+ rd.record_type = GNUNET_DNSPARSER_TYPE_A;
+ rd.flags = 0;
+ rh->proc (rh->proc_cls, 1, &rd);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
+ if (1 == inet_pton (AF_INET6,
+ rh->name,
+ &v6))
+ {
+ /* name is IPv6 address, pretend it's an AAAA record */
+ struct GNUNET_GNSRECORD_Data rd;
+
+ rd.data = &v6;
+ rd.data_size = sizeof (v6);
+ rd.expiration_time = UINT64_MAX;
+ rd.record_type = GNUNET_DNSPARSER_TYPE_AAAA;
+ rd.flags = 0;
+ rh->proc (rh->proc_cls, 1, &rd);
+ GNS_resolver_lookup_cancel (rh);
+ return;
+ }
if ( ( (GNUNET_YES == is_canonical (rh->name)) &&
(0 != strcmp (GNUNET_GNS_TLD, rh->name)) ) ||
( (GNUNET_YES != is_gnu_tld (rh->name)) &&
/* Name ends with ".zkey", try to replace authority zone with zkey
authority */
GNUNET_free (resolver_lookup_get_next_label (rh)); /* will return "zkey" */
- x = resolver_lookup_get_next_label (rh); /* will return 'x' coordinate */
y = resolver_lookup_get_next_label (rh); /* will return 'y' coordinate */
- GNUNET_asprintf (&pkey,
- "%s%s",
- x, y);
- if ( (NULL == x) ||
- (NULL == y) ||
+ if ( (NULL == y) ||
(GNUNET_OK !=
- GNUNET_CRYPTO_ecdsa_public_key_from_string (pkey,
- strlen (pkey),
- &rh->authority_zone)) )
+ GNUNET_CRYPTO_ecdsa_public_key_from_string (y,
+ strlen (y),
+ &rh->authority_zone)) )
{
GNUNET_log (GNUNET_ERROR_TYPE_WARNING,
_("Hostname `%s' is not well-formed, resolution fails\n"),
rh->name);
rh->task_id = GNUNET_SCHEDULER_add_now (&fail_resolution, rh);
}
- GNUNET_free_non_null (x);
GNUNET_free_non_null (y);
- GNUNET_free (pkey);
}
else
{
GNUNET_free (ac->label);
GNUNET_free (ac);
}
+ if (NULL != rh->g2dc)
+ {
+ /* rh->g2dc->rh is NOT in the DLL yet, so to enable us
+ using GNS_resolver_lookup_cancel here, we need to
+ add it first... */
+ if (NULL != rh->g2dc->rh)
+ {
+ GNUNET_CONTAINER_DLL_insert (rlh_head,
+ rlh_tail,
+ rh->g2dc->rh);
+ GNS_resolver_lookup_cancel (rh->g2dc->rh);
+ rh->g2dc->rh = NULL;
+ }
+ GNUNET_free (rh->g2dc->ns);
+ GNUNET_free (rh->g2dc);
+ rh->g2dc = NULL;
+ }
if (GNUNET_SCHEDULER_NO_TASK != rh->task_id)
{
GNUNET_SCHEDULER_cancel (rh->task_id);
projects / oweals / gnunet.git / blobdiff