Add busines logic for toggling multiple mx records etc.

[citadel.git] / citadel / modules / c-ares-dns / serv_c-ares-dns.c

diff --git a/citadel/modules/c-ares-dns/serv_c-ares-dns.c b/citadel/modules/c-ares-dns/serv_c-ares-dns.c
index 9cd52b9afb9daa1ea468e7519990161b21ab12d0..cba9d8303e52c4236ea69b1074fe9540db5892a0 100644 (file)
--- a/citadel/modules/c-ares-dns/serv_c-ares-dns.c
+++ b/citadel/modules/c-ares-dns/serv_c-ares-dns.c
@@ -69,12 +69,12 @@ static void HostByAddrCb(void *data,
                          struct hostent *hostent) 
 {
        AsyncIO *IO = data;
-       IO->DNSStatus = status;
+       IO->DNSQuery->DNSStatus = status;
        if  (status != ARES_SUCCESS) {
 //             ResolveError(*cb, status);
                return;
        }
-       IO->Data = hostent;
+       IO->DNSQuery->Data = hostent;
 /// TODO: howto free this??
 }
 
@@ -82,17 +82,17 @@ static void ParseAnswerA(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct hostent* host;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
-       IO->VParsedDNSReply = host;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
+       IO->DNSQuery->VParsedDNSReply = host;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 }
 
 
@@ -100,17 +100,17 @@ static void ParseAnswerAAAA(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct hostent* host;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_aaaa_reply(abuf, alen, &host, NULL, NULL);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
-       IO->VParsedDNSReply = host;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
+       IO->DNSQuery->VParsedDNSReply = host;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 }
 
 
@@ -118,19 +118,19 @@ static void ParseAnswerCNAME(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct hostent* host;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_a_reply(abuf, alen, &host, NULL, NULL);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
 
        // a CNAME lookup always returns a single record but
-       IO->VParsedDNSReply = host;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
+       IO->DNSQuery->VParsedDNSReply = host;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 }
 
 
@@ -138,18 +138,18 @@ static void ParseAnswerMX(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct ares_mx_reply *mx_out;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_mx_reply(abuf, alen, &mx_out);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_mx_reply(abuf, alen, &mx_out);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
 
-       IO->VParsedDNSReply = mx_out;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
+       IO->DNSQuery->VParsedDNSReply = mx_out;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_data;
 }
 
 
@@ -157,17 +157,17 @@ static void ParseAnswerNS(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct hostent* host;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_ns_reply(abuf, alen, &host);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_ns_reply(abuf, alen, &host);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
-       IO->VParsedDNSReply = host;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
+       IO->DNSQuery->VParsedDNSReply = host;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
 }
 
 
@@ -175,18 +175,18 @@ static void ParseAnswerSRV(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct ares_srv_reply *srv_out;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_srv_reply(abuf, alen, &srv_out);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_srv_reply(abuf, alen, &srv_out);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
 
-       IO->VParsedDNSReply = srv_out;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
+       IO->DNSQuery->VParsedDNSReply = srv_out;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_data;
 }
 
 
@@ -194,17 +194,17 @@ static void ParseAnswerTXT(AsyncIO *IO, unsigned char* abuf, int alen)
 {
        struct ares_txt_reply *txt_out;
 
-       if (IO->VParsedDNSReply != NULL)
-               IO->DNSReplyFree(IO->VParsedDNSReply);
-       IO->VParsedDNSReply = NULL;
+       if (IO->DNSQuery->VParsedDNSReply != NULL)
+               IO->DNSQuery->DNSReplyFree(IO->DNSQuery->VParsedDNSReply);
+       IO->DNSQuery->VParsedDNSReply = NULL;
 
-       IO->DNSStatus = ares_parse_txt_reply(abuf, alen, &txt_out);
-       if (IO->DNSStatus != ARES_SUCCESS) {
+       IO->DNSQuery->DNSStatus = ares_parse_txt_reply(abuf, alen, &txt_out);
+       if (IO->DNSQuery->DNSStatus != ARES_SUCCESS) {
 //    ResolveError(arg->js_cb, status);
                return;
        }
-       IO->VParsedDNSReply = txt_out;
-       IO->DNSReplyFree = (FreeDNSReply) ares_free_data;
+       IO->DNSQuery->VParsedDNSReply = txt_out;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_data;
 }
 
 void QueryCb(void *arg,
@@ -215,55 +215,106 @@ void QueryCb(void *arg,
 {
        AsyncIO *IO = arg;
 
-       IO->DNSStatus = status;
+       IO->DNSQuery->DNSStatus = status;
        if (status == ARES_SUCCESS)
-               IO->DNS_CB(arg, abuf, alen);
-///    ev_io_stop(event_base, &IO->dns_io_event);
-               
-       IO->PostDNS(IO);
+               IO->DNSQuery->DNS_CB(arg, abuf, alen);
+       else
+               IO->DNSQuery->DNSStatus = status;
+///    ev_io_stop(event_base, &IO->DNSQuery->dns_io_event);
+       
+       ev_idle_init(&IO->unwind_stack,
+                    IO_postdns_callback);
+       IO->unwind_stack.data = IO;
+       ev_idle_start(event_base, &IO->unwind_stack);
+       CtdlLogPrintf(CTDL_DEBUG, "C-ARES: %s\n", __FUNCTION__);
 }
 
-int QueueQuery(ns_type Type, char *name, AsyncIO *IO, IO_CallBack PostDNS)
+void QueryCbDone(AsyncIO *IO)
 {
-       int length, family;
-       char address_b[sizeof(struct in6_addr)];
-       int optmask = 0;
+       ev_idle_stop(event_base, &IO->unwind_stack);
+}
+
 
+void InitC_ares_dns(AsyncIO *IO)
+{
+       int optmask = 0;
        if (IO->DNSChannel == NULL) {
                optmask |= ARES_OPT_SOCK_STATE_CB;
                IO->DNSOptions.sock_state_cb = SockStateCb;
                IO->DNSOptions.sock_state_cb_data = IO;
                ares_init_options(&IO->DNSChannel, &IO->DNSOptions, optmask);
        }
+}
+
+void QueueGetHostByNameDone(void *Ctx, 
+                           int status,
+                           int timeouts,
+                           struct hostent *hostent)
+{
+       AsyncIO *IO = (AsyncIO *) Ctx;
+
+       IO->DNSQuery->DNSStatus = status;
+       IO->DNSQuery->VParsedDNSReply = hostent;
+       IO->DNSQuery->DNSReplyFree = (FreeDNSReply) ares_free_hostent;
+
+       ev_idle_init(&IO->unwind_stack,
+                    IO_postdns_callback);
+       IO->unwind_stack.data = IO;
+       ev_idle_start(event_base, &IO->unwind_stack);
+       CtdlLogPrintf(CTDL_DEBUG, "C-ARES: %s\n", __FUNCTION__);
+}
+
+void QueueGetHostByName(AsyncIO *IO, const char *Hostname, DNSQueryParts *QueryParts, IO_CallBack PostDNS)
+{
+       IO->DNSQuery = QueryParts;
+       IO->DNSQuery->PostDNS = PostDNS;
+
+       InitC_ares_dns(IO);
+
+       ares_gethostbyname(IO->DNSChannel,
+                          Hostname,   
+                          AF_INET6, /* it falls back to ipv4 in doubt... */
+                          QueueGetHostByNameDone,
+                          IO);
+//get_one_mx_host_ip_done);
+}
+int QueueQuery(ns_type Type, const char *name, AsyncIO *IO, DNSQueryParts *QueryParts, IO_CallBack PostDNS)
+{
+       int length, family;
+       char address_b[sizeof(struct in6_addr)];
+
+       IO->DNSQuery = QueryParts;
+       IO->DNSQuery->PostDNS = PostDNS;
+
+       InitC_ares_dns(IO);
 
-       IO->PostDNS = PostDNS;
        switch(Type) {
        case ns_t_a:
-               IO->DNS_CB = ParseAnswerA;
+               IO->DNSQuery->DNS_CB = ParseAnswerA;
                break;
 
        case ns_t_aaaa:
-               IO->DNS_CB = ParseAnswerAAAA;
+               IO->DNSQuery->DNS_CB = ParseAnswerAAAA;
                break;
 
        case ns_t_mx:
-               IO->DNS_CB = ParseAnswerMX;
+               IO->DNSQuery->DNS_CB = ParseAnswerMX;
                break;
 
        case ns_t_ns:
-               IO->DNS_CB = ParseAnswerNS;
+               IO->DNSQuery->DNS_CB = ParseAnswerNS;
                break;
 
        case ns_t_txt:
-               IO->DNS_CB = ParseAnswerTXT;
+               IO->DNSQuery->DNS_CB = ParseAnswerTXT;
                break;
 
        case ns_t_srv:
-               IO->DNS_CB = ParseAnswerSRV;
+               IO->DNSQuery->DNS_CB = ParseAnswerSRV;
                break;
 
        case ns_t_cname:
-               IO->DNS_CB = ParseAnswerCNAME;
+               IO->DNSQuery->DNS_CB = ParseAnswerCNAME;
                break;
 
        case ns_t_ptr:
@@ -290,6 +341,13 @@ int QueueQuery(ns_type Type, char *name, AsyncIO *IO, IO_CallBack PostDNS)
        return 1;
 }
 
+
+
+
+
+/*****************************************************************************
+ *                   libevent / c-ares integration                           *
+ *****************************************************************************/
 static void DNS_send_callback(struct ev_loop *loop, ev_io *watcher, int revents)
 {
        AsyncIO *IO = watcher->data;
@@ -321,8 +379,9 @@ void SockStateCb(void *data, int sock, int read, int write)
                IO->dns_recv_event.fd = sock;
                ev_io_init(&IO->dns_recv_event, DNS_recv_callback, IO->dns_recv_event.fd, EV_READ);
                IO->dns_recv_event.data = IO;
-
-       } else if (write) {
+               ev_io_start(event_base, &IO->dns_recv_event);
+       } 
+       if (write) {
                if ((IO->dns_send_event.fd != sock) &&
                    (IO->dns_send_event.fd != 0)) {
                        ev_io_stop(event_base, &IO->dns_send_event);
@@ -330,6 +389,7 @@ void SockStateCb(void *data, int sock, int read, int write)
                IO->dns_send_event.fd = sock;
                ev_io_init(&IO->dns_send_event, DNS_send_callback, IO->dns_send_event.fd, EV_WRITE);
                IO->dns_send_event.data = IO;
+               ev_io_start(event_base, &IO->dns_send_event);
        }
 /*
 
@@ -340,9 +400,11 @@ void SockStateCb(void *data, int sock, int read, int write)
                
                ret = ares_timeout(IO->DNSChannel, &maxtv, &tvbuf);
        }
-       if ((read == 0) && (write == 0)) {
-//             ev_io_stop(event_base, &IO->dns_io_event);
 */
+       if ((read == 0) && (write == 0)) {
+               ev_io_stop(event_base, &IO->dns_recv_event);
+               ev_io_stop(event_base, &IO->dns_send_event);
+       }
 }
 
 CTDL_MODULE_INIT(c_ares_client)