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https://github.com/systemd/systemd.git
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resolved: when resolving an address PTR record via llmnr, make a tcp connection by default
This commit is contained in:
parent
623a4c97b9
commit
b914e211f3
@ -360,6 +360,93 @@ int dns_name_reverse(int family, const union in_addr_union *a, char **ret) {
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return 0;
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}
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int dns_name_address(const char *p, int *family, union in_addr_union *address) {
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int r;
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assert(p);
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assert(family);
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assert(address);
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r = dns_name_endswith(p, "in-addr.arpa");
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if (r < 0)
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return r;
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if (r > 0) {
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uint8_t a[4];
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unsigned i;
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for (i = 0; i < ELEMENTSOF(a); i++) {
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char label[DNS_LABEL_MAX+1];
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r < 0)
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return r;
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if (r == 0)
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return -EINVAL;
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if (r > 3)
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return -EINVAL;
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r = safe_atou8(label, &a[i]);
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if (r < 0)
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return r;
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}
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r = dns_name_equal(p, "in-addr.arpa");
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if (r <= 0)
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return r;
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*family = AF_INET;
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address->in.s_addr = htobe32(((uint32_t) a[3] << 24) |
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((uint32_t) a[2] << 16) |
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((uint32_t) a[1] << 8) |
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(uint32_t) a[0]);
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return 1;
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}
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r = dns_name_endswith(p, "ip6.arpa");
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if (r < 0)
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return r;
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if (r > 0) {
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struct in6_addr a;
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unsigned i;
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for (i = 0; i < ELEMENTSOF(a.s6_addr); i++) {
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char label[DNS_LABEL_MAX+1];
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int x, y;
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r <= 0)
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return r;
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if (r != 1)
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return -EINVAL;
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x = unhexchar(label[0]);
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if (x < 0)
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return -EINVAL;
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r = dns_label_unescape(&p, label, sizeof(label));
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if (r <= 0)
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return r;
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if (r != 1)
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return -EINVAL;
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y = unhexchar(label[0]);
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if (y < 0)
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return -EINVAL;
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a.s6_addr[ELEMENTSOF(a.s6_addr) - i - 1] = (uint8_t) y << 4 | (uint8_t) x;
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}
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r = dns_name_equal(p, "ip6.arpa");
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if (r <= 0)
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return r;
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*family = AF_INET6;
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address->in6 = a;
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return 1;
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}
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return 0;
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}
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int dns_name_root(const char *name) {
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char label[DNS_LABEL_MAX+1];
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int r;
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@ -382,7 +469,6 @@ int dns_name_single_label(const char *name) {
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r = dns_label_unescape(&name, label, sizeof(label));
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if (r < 0)
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return r;
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if (r == 0)
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return 0;
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@ -39,6 +39,7 @@ int dns_name_equal(const char *x, const char *y);
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int dns_name_endswith(const char *name, const char *suffix);
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int dns_name_reverse(int family, const union in_addr_union *a, char **ret);
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int dns_name_address(const char *p, int *family, union in_addr_union *a);
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int dns_name_root(const char *name);
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int dns_name_single_label(const char *name);
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@ -165,7 +165,14 @@ static int on_stream_complete(DnsStream *s, int error) {
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return 0;
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}
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t->block_gc++;
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dns_query_transaction_process_reply(t, p);
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t->block_gc--;
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/* If the response wasn't useful, then complete the transition now */
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if (t->state == DNS_QUERY_PENDING)
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dns_query_transaction_complete(t, DNS_QUERY_INVALID_REPLY);
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return 0;
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}
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@ -181,10 +188,25 @@ static int dns_query_transaction_open_tcp(DnsQueryTransaction *t) {
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if (t->scope->protocol == DNS_PROTOCOL_DNS)
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fd = dns_scope_tcp_socket(t->scope, AF_UNSPEC, NULL, 53);
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else if (t->scope->protocol == DNS_PROTOCOL_LLMNR) {
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if (!t->received)
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return -EINVAL;
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fd = dns_scope_tcp_socket(t->scope, t->received->family, &t->received->sender, t->received->sender_port);
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/* When we already received a query to this (but it was truncated), send to its sender address */
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if (t->received)
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fd = dns_scope_tcp_socket(t->scope, t->received->family, &t->received->sender, t->received->sender_port);
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else {
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union in_addr_union address;
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int family;
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/* Otherwise, try to talk to the owner of a
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* the IP address, in case this is a reverse
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* PTR lookup */
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r = dns_question_extract_reverse_address(t->question, &family, &address);
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if (r < 0)
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return r;
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if (r == 0)
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return -EINVAL;
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fd = dns_scope_tcp_socket(t->scope, family, &address, 5355);
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}
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} else
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return -EAFNOSUPPORT;
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@ -205,6 +227,13 @@ static int dns_query_transaction_open_tcp(DnsQueryTransaction *t) {
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t->received = dns_packet_unref(t->received);
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t->stream->complete = on_stream_complete;
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t->stream->transaction = t;
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/* The interface index is difficult to determine if we are
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* connecting to the local host, hence fill this in right away
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* instead of determining it from the socket */
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if (t->scope->link)
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t->stream->ifindex = t->scope->link->ifindex;
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return 0;
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}
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@ -416,10 +445,19 @@ static int dns_query_transaction_go(DnsQueryTransaction *t) {
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if (r < 0)
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return r;
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/* Try via UDP, and if that fails due to large size try via TCP */
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r = dns_scope_send(t->scope, t->sent);
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if (r == -EMSGSIZE)
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if (t->scope->protocol == DNS_PROTOCOL_LLMNR &&
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(dns_question_endswith(t->question, "in-addr.arpa") > 0 ||
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dns_question_endswith(t->question, "ip6.arpa") > 0)) {
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/* RFC 4795, Section 2.4. says reverse lookups shall
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* always be made via TCP on LLMNR */
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r = dns_query_transaction_open_tcp(t);
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} else {
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/* Try via UDP, and if that fails due to large size try via TCP */
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r = dns_scope_send(t->scope, t->sent);
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if (r == -EMSGSIZE)
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r = dns_query_transaction_open_tcp(t);
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}
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if (r == -ESRCH) {
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/* No servers to send this to? */
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dns_query_transaction_complete(t, DNS_QUERY_NO_SERVERS);
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@ -235,3 +235,38 @@ int dns_question_cname_redirect(DnsQuestion *q, const char *name, DnsQuestion **
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return 1;
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}
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int dns_question_endswith(DnsQuestion *q, const char *suffix) {
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unsigned i;
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assert(q);
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assert(suffix);
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for (i = 0; i < q->n_keys; i++) {
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int k;
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k = dns_name_endswith(DNS_RESOURCE_KEY_NAME(q->keys[i]), suffix);
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if (k <= 0)
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return k;
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}
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return 1;
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}
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int dns_question_extract_reverse_address(DnsQuestion *q, int *family, union in_addr_union *address) {
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unsigned i;
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assert(q);
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assert(family);
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assert(address);
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for (i = 0; i < q->n_keys; i++) {
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int k;
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k = dns_name_address(DNS_RESOURCE_KEY_NAME(q->keys[i]), family, address);
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if (k != 0)
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return k;
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}
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return 0;
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}
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@ -46,4 +46,7 @@ int dns_question_is_superset(DnsQuestion *q, DnsQuestion *other);
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int dns_question_cname_redirect(DnsQuestion *q, const char *name, DnsQuestion **ret);
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int dns_question_endswith(DnsQuestion *q, const char *suffix);
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int dns_question_extract_reverse_address(DnsQuestion *q, int *family, union in_addr_union *address);
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsQuestion*, dns_question_unref);
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@ -312,8 +312,8 @@ DnsScopeMatch dns_scope_good_domain(DnsScope *s, const char *domain) {
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}
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if (s->protocol == DNS_PROTOCOL_LLMNR) {
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if (dns_name_endswith(domain, "254.169.in-addr.arpa") > 0 ||
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dns_name_endswith(domain, "0.8.e.f.ip6.arpa") > 0 ||
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if (dns_name_endswith(domain, "in-addr.arpa") > 0 ||
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dns_name_endswith(domain, "ip6.arpa") > 0 ||
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dns_name_single_label(domain) > 0)
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return DNS_SCOPE_MAYBE;
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@ -48,7 +48,7 @@ static int dns_stream_update_io(DnsStream *s) {
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return sd_event_source_set_io_events(s->io_event_source, f);
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}
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static int stream_complete(DnsStream *s, int error) {
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static int dns_stream_complete(DnsStream *s, int error) {
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assert(s);
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dns_stream_stop(s);
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@ -61,161 +61,7 @@ static int stream_complete(DnsStream *s, int error) {
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return 0;
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}
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static int on_stream_timeout(sd_event_source *es, usec_t usec, void *userdata) {
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DnsStream *s = userdata;
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assert(s);
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return stream_complete(s, ETIMEDOUT);
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}
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static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
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DnsStream *s = userdata;
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int r;
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assert(s);
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if ((revents & EPOLLOUT) &&
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s->write_packet &&
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s->n_written < sizeof(s->write_size) + s->write_packet->size) {
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struct iovec iov[2];
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ssize_t ss;
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iov[0].iov_base = &s->write_size;
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iov[0].iov_len = sizeof(s->write_size);
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iov[1].iov_base = DNS_PACKET_DATA(s->write_packet);
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iov[1].iov_len = s->write_packet->size;
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IOVEC_INCREMENT(iov, 2, s->n_written);
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ss = writev(fd, iov, 2);
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if (ss < 0) {
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if (errno != EINTR && errno != EAGAIN)
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return stream_complete(s, errno);
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} else
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s->n_written += ss;
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/* Are we done? If so, disable the event source for EPOLLOUT */
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if (s->n_written >= sizeof(s->write_size) + s->write_packet->size) {
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r = dns_stream_update_io(s);
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if (r < 0)
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return stream_complete(s, -r);
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}
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}
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if ((revents & (EPOLLIN|EPOLLHUP|EPOLLRDHUP)) &&
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(!s->read_packet ||
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s->n_read < sizeof(s->read_size) + s->read_packet->size)) {
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if (s->n_read < sizeof(s->read_size)) {
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ssize_t ss;
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ss = read(fd, (uint8_t*) &s->read_size + s->n_read, sizeof(s->read_size) - s->n_read);
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if (ss < 0) {
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if (errno != EINTR && errno != EAGAIN)
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return stream_complete(s, errno);
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} else if (ss == 0)
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return stream_complete(s, ECONNRESET);
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else
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s->n_read += ss;
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}
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if (s->n_read >= sizeof(s->read_size)) {
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if (be16toh(s->read_size) < DNS_PACKET_HEADER_SIZE)
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return stream_complete(s, EBADMSG);
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if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) {
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ssize_t ss;
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if (!s->read_packet) {
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r = dns_packet_new(&s->read_packet, s->protocol, be16toh(s->read_size));
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if (r < 0)
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return stream_complete(s, -r);
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s->read_packet->size = be16toh(s->read_size);
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s->read_packet->ipproto = IPPROTO_TCP;
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s->read_packet->family = s->peer.sa.sa_family;
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s->read_packet->ttl = s->ttl;
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s->read_packet->ifindex = s->ifindex;
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if (s->read_packet->family == AF_INET) {
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s->read_packet->sender.in = s->peer.in.sin_addr;
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s->read_packet->sender_port = be16toh(s->peer.in.sin_port);
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s->read_packet->destination.in = s->local.in.sin_addr;
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s->read_packet->destination_port = be16toh(s->local.in.sin_port);
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} else {
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assert(s->read_packet->family == AF_INET6);
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s->read_packet->sender.in6 = s->peer.in6.sin6_addr;
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s->read_packet->sender_port = be16toh(s->peer.in6.sin6_port);
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s->read_packet->destination.in6 = s->local.in6.sin6_addr;
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s->read_packet->destination_port = be16toh(s->local.in6.sin6_port);
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if (s->read_packet->ifindex == 0)
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s->read_packet->ifindex = s->peer.in6.sin6_scope_id;
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if (s->read_packet->ifindex == 0)
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s->read_packet->ifindex = s->local.in6.sin6_scope_id;
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}
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}
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ss = read(fd,
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(uint8_t*) DNS_PACKET_DATA(s->read_packet) + s->n_read - sizeof(s->read_size),
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sizeof(s->read_size) + be16toh(s->read_size) - s->n_read);
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if (ss < 0) {
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if (errno != EINTR && errno != EAGAIN)
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return stream_complete(s, errno);
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} else if (ss == 0)
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return stream_complete(s, ECONNRESET);
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else
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s->n_read += ss;
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}
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/* Are we done? If so, disable the event source for EPOLLIN */
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if (s->n_read >= sizeof(s->read_size) + be16toh(s->read_size)) {
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r = dns_stream_update_io(s);
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if (r < 0)
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return stream_complete(s, -r);
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/* If there's a packet handler
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* installed, call that. Note that
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* this is optional... */
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if (s->on_packet)
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return s->on_packet(s);
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}
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}
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}
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if ((s->write_packet && s->n_written >= sizeof(s->write_size) + s->write_packet->size) &&
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(s->read_packet && s->n_read >= sizeof(s->read_size) + s->read_packet->size))
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return stream_complete(s, 0);
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return 0;
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}
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DnsStream *dns_stream_free(DnsStream *s) {
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if (!s)
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return NULL;
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dns_stream_stop(s);
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if (s->manager) {
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LIST_REMOVE(streams, s->manager->dns_streams, s);
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s->manager->n_dns_streams--;
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}
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dns_packet_unref(s->write_packet);
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dns_packet_unref(s->read_packet);
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free(s);
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return 0;
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}
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DEFINE_TRIVIAL_CLEANUP_FUNC(DnsStream*, dns_stream_free);
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int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
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static const int one = 1;
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static int dns_stream_identify(DnsStream *s) {
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union {
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struct cmsghdr header; /* For alignment */
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uint8_t buffer[CMSG_SPACE(MAX(sizeof(struct in_pktinfo), sizeof(struct in6_pktinfo)))
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@ -223,39 +69,30 @@ int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
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} control;
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struct msghdr mh = {};
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struct cmsghdr *cmsg;
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_cleanup_(dns_stream_freep) DnsStream *s = NULL;
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socklen_t sl;
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int r;
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assert(m);
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assert(fd >= 0);
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assert(s);
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if (m->n_dns_streams > DNS_STREAMS_MAX)
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return -EBUSY;
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s = new0(DnsStream, 1);
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if (!s)
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return -ENOMEM;
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s->fd = -1;
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s->protocol = protocol;
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/* Query the remote side */
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s->peer_salen = sizeof(s->peer);
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r = getpeername(fd, &s->peer.sa, &s->peer_salen);
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if (r < 0)
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return -errno;
|
||||
if (s->peer.sa.sa_family == AF_INET6)
|
||||
s->ifindex = s->peer.in6.sin6_scope_id;
|
||||
if (s->identified)
|
||||
return 0;
|
||||
|
||||
/* Query the local side */
|
||||
s->local_salen = sizeof(s->local);
|
||||
r = getsockname(fd, &s->local.sa, &s->local_salen);
|
||||
r = getsockname(s->fd, &s->local.sa, &s->local_salen);
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
if (s->local.sa.sa_family == AF_INET6 && s->ifindex <= 0)
|
||||
s->ifindex = s->local.in6.sin6_scope_id;
|
||||
|
||||
/* Query the remote side */
|
||||
s->peer_salen = sizeof(s->peer);
|
||||
r = getpeername(s->fd, &s->peer.sa, &s->peer_salen);
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
if (s->peer.sa.sa_family == AF_INET6 && s->ifindex <= 0)
|
||||
s->ifindex = s->peer.in6.sin6_scope_id;
|
||||
|
||||
/* Check consistency */
|
||||
assert(s->peer.sa.sa_family == s->local.sa.sa_family);
|
||||
assert(IN_SET(s->peer.sa.sa_family, AF_INET, AF_INET6));
|
||||
@ -263,16 +100,16 @@ int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
|
||||
/* Query connection meta information */
|
||||
sl = sizeof(control);
|
||||
if (s->peer.sa.sa_family == AF_INET) {
|
||||
r = getsockopt(fd, IPPROTO_IP, IP_PKTOPTIONS, &control, &sl);
|
||||
r = getsockopt(s->fd, IPPROTO_IP, IP_PKTOPTIONS, &control, &sl);
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
} else {
|
||||
assert(s->peer.sa.sa_family == AF_INET6);
|
||||
} else if (s->peer.sa.sa_family == AF_INET6) {
|
||||
|
||||
r = getsockopt(fd, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &control, &sl);
|
||||
r = getsockopt(s->fd, IPPROTO_IPV6, IPV6_2292PKTOPTIONS, &control, &sl);
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
}
|
||||
} else
|
||||
return -EAFNOSUPPORT;
|
||||
|
||||
mh.msg_control = &control;
|
||||
mh.msg_controllen = sl;
|
||||
@ -320,33 +157,213 @@ int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
|
||||
* device if the connection came from the local host since it
|
||||
* avoids the routing table in such a case. Let's unset the
|
||||
* interface index in such a case. */
|
||||
if (s->ifindex > 0 && manager_ifindex_is_loopback(m, s->ifindex) != 0)
|
||||
if (s->ifindex > 0 && manager_ifindex_is_loopback(s->manager, s->ifindex) != 0)
|
||||
s->ifindex = 0;
|
||||
|
||||
/* If we don't know the interface index still, we look for the
|
||||
* first local interface with a matching address. Yuck! */
|
||||
if (s->ifindex <= 0)
|
||||
s->ifindex = manager_find_ifindex(m, s->local.sa.sa_family, s->local.sa.sa_family == AF_INET ? (union in_addr_union*) &s->local.in.sin_addr : (union in_addr_union*) &s->local.in6.sin6_addr);
|
||||
|
||||
r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
s->ifindex = manager_find_ifindex(s->manager, s->local.sa.sa_family, s->local.sa.sa_family == AF_INET ? (union in_addr_union*) &s->local.in.sin_addr : (union in_addr_union*) &s->local.in6.sin6_addr);
|
||||
|
||||
if (s->protocol == DNS_PROTOCOL_LLMNR && s->ifindex > 0) {
|
||||
uint32_t ifindex = htobe32(s->ifindex);
|
||||
|
||||
/* Make sure all packets for this connection are sent on the same interface */
|
||||
if (s->local.sa.sa_family == AF_INET) {
|
||||
r = setsockopt(fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex));
|
||||
r = setsockopt(s->fd, IPPROTO_IP, IP_UNICAST_IF, &ifindex, sizeof(ifindex));
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
} else if (s->local.sa.sa_family == AF_INET6) {
|
||||
r = setsockopt(fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex));
|
||||
r = setsockopt(s->fd, IPPROTO_IPV6, IPV6_UNICAST_IF, &ifindex, sizeof(ifindex));
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
}
|
||||
}
|
||||
|
||||
s->identified = true;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int on_stream_timeout(sd_event_source *es, usec_t usec, void *userdata) {
|
||||
DnsStream *s = userdata;
|
||||
|
||||
assert(s);
|
||||
|
||||
return dns_stream_complete(s, ETIMEDOUT);
|
||||
}
|
||||
|
||||
static int on_stream_io(sd_event_source *es, int fd, uint32_t revents, void *userdata) {
|
||||
DnsStream *s = userdata;
|
||||
int r;
|
||||
|
||||
assert(s);
|
||||
|
||||
r = dns_stream_identify(s);
|
||||
if (r < 0)
|
||||
return dns_stream_complete(s, -r);
|
||||
|
||||
if ((revents & EPOLLOUT) &&
|
||||
s->write_packet &&
|
||||
s->n_written < sizeof(s->write_size) + s->write_packet->size) {
|
||||
|
||||
struct iovec iov[2];
|
||||
ssize_t ss;
|
||||
|
||||
iov[0].iov_base = &s->write_size;
|
||||
iov[0].iov_len = sizeof(s->write_size);
|
||||
iov[1].iov_base = DNS_PACKET_DATA(s->write_packet);
|
||||
iov[1].iov_len = s->write_packet->size;
|
||||
|
||||
IOVEC_INCREMENT(iov, 2, s->n_written);
|
||||
|
||||
ss = writev(fd, iov, 2);
|
||||
if (ss < 0) {
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
return dns_stream_complete(s, errno);
|
||||
} else
|
||||
s->n_written += ss;
|
||||
|
||||
/* Are we done? If so, disable the event source for EPOLLOUT */
|
||||
if (s->n_written >= sizeof(s->write_size) + s->write_packet->size) {
|
||||
r = dns_stream_update_io(s);
|
||||
if (r < 0)
|
||||
return dns_stream_complete(s, -r);
|
||||
}
|
||||
}
|
||||
|
||||
if ((revents & (EPOLLIN|EPOLLHUP|EPOLLRDHUP)) &&
|
||||
(!s->read_packet ||
|
||||
s->n_read < sizeof(s->read_size) + s->read_packet->size)) {
|
||||
|
||||
if (s->n_read < sizeof(s->read_size)) {
|
||||
ssize_t ss;
|
||||
|
||||
ss = read(fd, (uint8_t*) &s->read_size + s->n_read, sizeof(s->read_size) - s->n_read);
|
||||
if (ss < 0) {
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
return dns_stream_complete(s, errno);
|
||||
} else if (ss == 0)
|
||||
return dns_stream_complete(s, ECONNRESET);
|
||||
else
|
||||
s->n_read += ss;
|
||||
}
|
||||
|
||||
if (s->n_read >= sizeof(s->read_size)) {
|
||||
|
||||
if (be16toh(s->read_size) < DNS_PACKET_HEADER_SIZE)
|
||||
return dns_stream_complete(s, EBADMSG);
|
||||
|
||||
if (s->n_read < sizeof(s->read_size) + be16toh(s->read_size)) {
|
||||
ssize_t ss;
|
||||
|
||||
if (!s->read_packet) {
|
||||
r = dns_packet_new(&s->read_packet, s->protocol, be16toh(s->read_size));
|
||||
if (r < 0)
|
||||
return dns_stream_complete(s, -r);
|
||||
|
||||
s->read_packet->size = be16toh(s->read_size);
|
||||
s->read_packet->ipproto = IPPROTO_TCP;
|
||||
s->read_packet->family = s->peer.sa.sa_family;
|
||||
s->read_packet->ttl = s->ttl;
|
||||
s->read_packet->ifindex = s->ifindex;
|
||||
|
||||
if (s->read_packet->family == AF_INET) {
|
||||
s->read_packet->sender.in = s->peer.in.sin_addr;
|
||||
s->read_packet->sender_port = be16toh(s->peer.in.sin_port);
|
||||
s->read_packet->destination.in = s->local.in.sin_addr;
|
||||
s->read_packet->destination_port = be16toh(s->local.in.sin_port);
|
||||
} else {
|
||||
assert(s->read_packet->family == AF_INET6);
|
||||
s->read_packet->sender.in6 = s->peer.in6.sin6_addr;
|
||||
s->read_packet->sender_port = be16toh(s->peer.in6.sin6_port);
|
||||
s->read_packet->destination.in6 = s->local.in6.sin6_addr;
|
||||
s->read_packet->destination_port = be16toh(s->local.in6.sin6_port);
|
||||
|
||||
if (s->read_packet->ifindex == 0)
|
||||
s->read_packet->ifindex = s->peer.in6.sin6_scope_id;
|
||||
if (s->read_packet->ifindex == 0)
|
||||
s->read_packet->ifindex = s->local.in6.sin6_scope_id;
|
||||
}
|
||||
}
|
||||
|
||||
ss = read(fd,
|
||||
(uint8_t*) DNS_PACKET_DATA(s->read_packet) + s->n_read - sizeof(s->read_size),
|
||||
sizeof(s->read_size) + be16toh(s->read_size) - s->n_read);
|
||||
if (ss < 0) {
|
||||
if (errno != EINTR && errno != EAGAIN)
|
||||
return dns_stream_complete(s, errno);
|
||||
} else if (ss == 0)
|
||||
return dns_stream_complete(s, ECONNRESET);
|
||||
else
|
||||
s->n_read += ss;
|
||||
}
|
||||
|
||||
/* Are we done? If so, disable the event source for EPOLLIN */
|
||||
if (s->n_read >= sizeof(s->read_size) + be16toh(s->read_size)) {
|
||||
r = dns_stream_update_io(s);
|
||||
if (r < 0)
|
||||
return dns_stream_complete(s, -r);
|
||||
|
||||
/* If there's a packet handler
|
||||
* installed, call that. Note that
|
||||
* this is optional... */
|
||||
if (s->on_packet)
|
||||
return s->on_packet(s);
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
if ((s->write_packet && s->n_written >= sizeof(s->write_size) + s->write_packet->size) &&
|
||||
(s->read_packet && s->n_read >= sizeof(s->read_size) + s->read_packet->size))
|
||||
return dns_stream_complete(s, 0);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
DnsStream *dns_stream_free(DnsStream *s) {
|
||||
if (!s)
|
||||
return NULL;
|
||||
|
||||
dns_stream_stop(s);
|
||||
|
||||
if (s->manager) {
|
||||
LIST_REMOVE(streams, s->manager->dns_streams, s);
|
||||
s->manager->n_dns_streams--;
|
||||
}
|
||||
|
||||
dns_packet_unref(s->write_packet);
|
||||
dns_packet_unref(s->read_packet);
|
||||
|
||||
free(s);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
DEFINE_TRIVIAL_CLEANUP_FUNC(DnsStream*, dns_stream_free);
|
||||
|
||||
int dns_stream_new(Manager *m, DnsStream **ret, DnsProtocol protocol, int fd) {
|
||||
static const int one = 1;
|
||||
_cleanup_(dns_stream_freep) DnsStream *s = NULL;
|
||||
int r;
|
||||
|
||||
assert(m);
|
||||
assert(fd >= 0);
|
||||
|
||||
if (m->n_dns_streams > DNS_STREAMS_MAX)
|
||||
return -EBUSY;
|
||||
|
||||
s = new0(DnsStream, 1);
|
||||
if (!s)
|
||||
return -ENOMEM;
|
||||
|
||||
s->fd = -1;
|
||||
s->protocol = protocol;
|
||||
|
||||
r = setsockopt(fd, IPPROTO_TCP, TCP_NODELAY, &one, sizeof(one));
|
||||
if (r < 0)
|
||||
return -errno;
|
||||
|
||||
r = sd_event_add_io(m->event, &s->io_event_source, fd, EPOLLIN, on_stream_io, s);
|
||||
if (r < 0)
|
||||
return r;
|
||||
|
@ -39,6 +39,7 @@ struct DnsStream {
|
||||
socklen_t local_salen;
|
||||
int ifindex;
|
||||
uint32_t ttl;
|
||||
bool identified;
|
||||
|
||||
sd_event_source *io_event_source;
|
||||
sd_event_source *timeout_event_source;
|
||||
|
@ -159,6 +159,24 @@ static void test_dns_name_single_label(void) {
|
||||
assert_se(dns_name_single_label("xx.yy") == false);
|
||||
}
|
||||
|
||||
static void test_dns_name_reverse_one(const char *address, const char *name) {
|
||||
_cleanup_free_ char *p = NULL;
|
||||
union in_addr_union a, b;
|
||||
int familya, familyb;
|
||||
|
||||
assert_se(in_addr_from_string_auto(address, &familya, &a) >= 0);
|
||||
assert_se(dns_name_reverse(familya, &a, &p) >= 0);
|
||||
assert_se(streq(p, name));
|
||||
assert_se(dns_name_address(p, &familyb, &b) > 0);
|
||||
assert_se(familya == familyb);
|
||||
assert_se(in_addr_equal(familya, &a, &b));
|
||||
}
|
||||
|
||||
static void test_dns_name_reverse(void) {
|
||||
test_dns_name_reverse_one("47.11.8.15", "15.8.11.47.in-addr.arpa");
|
||||
test_dns_name_reverse_one("fe80::47", "7.4.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.0.8.e.f.ip6.arpa");
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[]) {
|
||||
|
||||
test_dns_label_unescape();
|
||||
@ -168,6 +186,7 @@ int main(int argc, char *argv[]) {
|
||||
test_dns_name_endswith();
|
||||
test_dns_name_root();
|
||||
test_dns_name_single_label();
|
||||
test_dns_name_reverse();
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
@ -332,6 +332,26 @@ int safe_atoi(const char *s, int *ret_i) {
|
||||
return 0;
|
||||
}
|
||||
|
||||
int safe_atou8(const char *s, uint8_t *ret) {
|
||||
char *x = NULL;
|
||||
unsigned long l;
|
||||
|
||||
assert(s);
|
||||
assert(ret);
|
||||
|
||||
errno = 0;
|
||||
l = strtoul(s, &x, 0);
|
||||
|
||||
if (!x || x == s || *x || errno)
|
||||
return errno > 0 ? -errno : -EINVAL;
|
||||
|
||||
if ((unsigned long) (uint8_t) l != l)
|
||||
return -ERANGE;
|
||||
|
||||
*ret = (uint8_t) l;
|
||||
return 0;
|
||||
}
|
||||
|
||||
int safe_atollu(const char *s, long long unsigned *ret_llu) {
|
||||
char *x = NULL;
|
||||
unsigned long long l;
|
||||
|
@ -192,6 +192,8 @@ int safe_atolli(const char *s, long long int *ret_i);
|
||||
|
||||
int safe_atod(const char *s, double *ret_d);
|
||||
|
||||
int safe_atou8(const char *s, uint8_t *ret);
|
||||
|
||||
#if __WORDSIZE == 32
|
||||
static inline int safe_atolu(const char *s, unsigned long *ret_u) {
|
||||
assert_cc(sizeof(unsigned long) == sizeof(unsigned));
|
||||
|
Loading…
Reference in New Issue
Block a user