X-Git-Url: http://git.meshlink.io/?a=blobdiff_plain;f=server.c;h=0f292a349e84b7d302db79b4a103ee03c87c5bbe;hb=c18626ad35cdf94edbff196070ccbb6ae825abd0;hp=79c017fe11cd57d280583e78ed60ae77611c0de6;hpb=0781d5363fb6fd723a2316fc7558aef6439b2f71;p=catta

diff --git a/server.c b/server.c
index 79c017f..0f292a3 100644
--- a/server.c
+++ b/server.c
@@ -2,10 +2,191 @@
 #include <arpa/inet.h>
 #include <string.h>
 #include <sys/utsname.h>
+#include <unistd.h>
 
 #include "server.h"
 #include "util.h"
 #include "iface.h"
+#include "socket.h"
+
+static void handle_query_key(flxServer *s, flxKey *k, flxInterface *i, const flxAddress *a) {
+    flxEntry *e;
+    
+    g_assert(s);
+    g_assert(k);
+    g_assert(i);
+    g_assert(a);
+
+    for (e = g_hash_table_lookup(s->rrset_by_name, k); e; e = e->by_name_next) {
+
+        if ((e->interface <= 0 || e->interface == i->index) &&
+            (e->protocol == AF_UNSPEC || e->protocol == a->family)) {
+
+            flx_interface_post_response(i, a->family, e->record);
+        }
+    }
+}
+
+static void handle_query(flxServer *s, flxDnsPacket *p, flxInterface *i, const flxAddress *a) {
+    guint n;
+    
+    g_assert(s);
+    g_assert(p);
+    g_assert(i);
+    g_assert(a);
+
+    for (n = flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT); n > 0; n --) {
+        flxKey *key;
+
+        if (!(key = flx_dns_packet_consume_key(p))) {
+            g_warning("Packet too short");
+            return;
+        }
+
+        handle_query_key(s, key, i, a);
+        flx_key_unref(key);
+    }
+}
+
+static void handle_response(flxServer *s, flxDnsPacket *p, flxInterface *i, const flxAddress *a) {
+    guint n;
+    
+    g_assert(s);
+    g_assert(p);
+    g_assert(i);
+    g_assert(a);
+    
+    for (n = flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT); n > 0; n--) {
+        flxRecord *record;
+        gboolean cache_flush = FALSE;
+        
+        if (!(record = flx_dns_packet_consume_record(p, &cache_flush))) {
+            g_warning("Packet too short");
+            return;
+        }
+
+        flx_cache_update(a->family == AF_INET ? i->ipv4_cache : i->ipv6_cache, record, cache_flush, a);
+        flx_packet_scheduler_drop_response(a->family == AF_INET ? i->ipv4_scheduler : i->ipv6_scheduler, record);
+        flx_record_unref(record);
+    }
+}
+
+static void dispatch_packet(flxServer *s, flxDnsPacket *p, struct sockaddr *sa, gint iface, gint ttl) {
+    flxInterface *i;
+    flxAddress a;
+    
+    g_assert(s);
+    g_assert(p);
+    g_assert(sa);
+    g_assert(iface > 0);
+
+    g_message("new packet recieved.");
+
+    if (!(i = flx_interface_monitor_get_interface(s->monitor, iface))) {
+        g_warning("Recieved packet from invalid interface.");
+        return;
+    }
+
+    if (ttl != 255) {
+        g_warning("Recieved packet with invalid TTL on interface '%s'.", i->name);
+        return;
+    }
+
+    if (sa->sa_family == AF_INET6) {
+        static const unsigned char ipv4_in_ipv6[] = {
+            0x00, 0x00, 0x00, 0x00,
+            0x00, 0x00, 0x00, 0x00,
+            0xFF, 0xFF, 0xFF, 0xFF };
+
+        if (memcmp(((struct sockaddr_in6*) sa)->sin6_addr.s6_addr, ipv4_in_ipv6, sizeof(ipv4_in_ipv6)) == 0) {
+
+            /* This is an IPv4 address encapsulated in IPv6, so let's ignore it. */
+            return;
+        }
+    }
+
+    if (flx_dns_packet_check_valid(p) < 0) {
+        g_warning("Recieved invalid packet.");
+        return;
+    }
+
+    flx_address_from_sockaddr(sa, &a);
+
+    
+    if (flx_dns_packet_is_query(p)) {
+
+        if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) == 0 ||
+            flx_dns_packet_get_field(p, DNS_FIELD_ARCOUNT) != 0 ||
+            flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0) {
+            g_warning("Invalid query packet.");
+            return;
+        }
+                
+        handle_query(s, p, i, &a);    
+        g_message("Handled query");
+    } else {
+        if (flx_dns_packet_get_field(p, DNS_FIELD_QDCOUNT) != 0 ||
+            flx_dns_packet_get_field(p, DNS_FIELD_ANCOUNT) == 0 ||
+            flx_dns_packet_get_field(p, DNS_FIELD_NSCOUNT) != 0 ||
+            flx_dns_packet_get_field(p, DNS_FIELD_ARCOUNT) != 0) {
+            g_warning("Invalid response packet.");
+            return;
+        }
+
+        handle_response(s, p, i, &a);
+        g_message("Handled response");
+    }
+}
+
+static gboolean work(flxServer *s) {
+    struct sockaddr_in6 sa6;
+    struct sockaddr_in sa;
+    flxDnsPacket *p;
+    gint iface = -1;
+    guint8 ttl;
+        
+    g_assert(s);
+
+    if (s->pollfd_ipv4.revents & G_IO_IN) {
+        if ((p = flx_recv_dns_packet_ipv4(s->fd_ipv4, &sa, &iface, &ttl)))
+            dispatch_packet(s, p, (struct sockaddr*) &sa, iface, ttl);
+    }
+
+    if (s->pollfd_ipv6.revents & G_IO_IN) {
+        if ((p = flx_recv_dns_packet_ipv6(s->fd_ipv6, &sa6, &iface, &ttl)))
+            dispatch_packet(s, p, (struct sockaddr*) &sa6, iface, ttl);
+    }
+
+    return TRUE;
+}
+
+static gboolean prepare_func(GSource *source, gint *timeout) {
+    g_assert(source);
+    g_assert(timeout);
+    
+    *timeout = -1;
+    return FALSE;
+}
+
+static gboolean check_func(GSource *source) {
+    flxServer* s;
+    g_assert(source);
+
+    s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
+    g_assert(s);
+    
+    return (s->pollfd_ipv4.revents | s->pollfd_ipv6.revents) & (G_IO_IN | G_IO_HUP | G_IO_ERR);
+}
+
+static gboolean dispatch_func(GSource *source, GSourceFunc callback, gpointer user_data) {
+    flxServer* s;
+    g_assert(source);
+
+    s = *((flxServer**) (((guint8*) source) + sizeof(GSource)));
+    g_assert(s);
+    
+    return work(s);
+}
 
 static void add_default_entries(flxServer *s) {
     gint length = 0;
@@ -35,9 +216,32 @@ static void add_default_entries(flxServer *s) {
 flxServer *flx_server_new(GMainContext *c) {
     gchar *hn, *e;
     flxServer *s;
+    
+    static GSourceFuncs source_funcs = {
+        prepare_func,
+        check_func,
+        dispatch_func,
+        NULL,
+        NULL,
+        NULL
+    };
 
     s = g_new(flxServer, 1);
 
+    s->fd_ipv4 = flx_open_socket_ipv4();
+    s->fd_ipv6 = flx_open_socket_ipv6();
+    
+    if (s->fd_ipv6 < 0 && s->fd_ipv4 < 0) {
+        g_critical("Failed to create sockets.\n");
+        g_free(s);
+        return NULL;
+    }
+
+    if (s->fd_ipv4 < 0)
+        g_message("Failed to create IPv4 socket, proceeding in IPv6 only mode");
+    else if (s->fd_ipv6 < 0)
+        g_message("Failed to create IPv6 socket, proceeding in IPv4 only mode");
+    
     if (c)
         g_main_context_ref(s->context = c);
     else
@@ -62,6 +266,21 @@ flxServer *flx_server_new(GMainContext *c) {
 
     add_default_entries(s);
 
+    s->source = g_source_new(&source_funcs, sizeof(GSource) + sizeof(flxServer*));
+    *((flxServer**) (((guint8*) s->source) + sizeof(GSource))) = s;
+
+    memset(&s->pollfd_ipv4, 0, sizeof(s->pollfd_ipv4));
+    s->pollfd_ipv4.fd = s->fd_ipv4;
+    s->pollfd_ipv4.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
+    g_source_add_poll(s->source, &s->pollfd_ipv4);
+    
+    memset(&s->pollfd_ipv6, 0, sizeof(s->pollfd_ipv6));
+    s->pollfd_ipv6.fd = s->fd_ipv6;
+    s->pollfd_ipv6.events = G_IO_IN|G_IO_ERR|G_IO_HUP;
+    g_source_add_poll(s->source, &s->pollfd_ipv6);
+
+    g_source_attach(s->source, s->context);
+    
     return s;
 }
 
@@ -76,9 +295,18 @@ void flx_server_free(flxServer* s) {
     g_hash_table_destroy(s->rrset_by_name);
 
     flx_time_event_queue_free(s->time_event_queue);
-    g_main_context_unref(s->context);
+
+    if (s->fd_ipv4 >= 0)
+        close(s->fd_ipv4);
+    if (s->fd_ipv6 >= 0)
+        close(s->fd_ipv6);
     
     g_free(s->hostname);
+
+    g_source_destroy(s->source);
+    g_source_unref(s->source);
+    g_main_context_unref(s->context);
+
     g_free(s);
 }
 
@@ -206,6 +434,8 @@ void flx_server_dump(flxServer *s, FILE *f) {
     g_assert(s);
     g_assert(f);
 
+    fprintf(f, ";;; ZONE DUMP FOLLOWS ;;;\n");
+
     for (e = s->entries; e; e = e->entry_next) {
         gchar *t;
 
@@ -213,6 +443,8 @@ void flx_server_dump(flxServer *s, FILE *f) {
         fprintf(f, "%s\n", t);
         g_free(t);
     }
+
+    flx_dump_caches(s, f);
 }
 
 void flx_server_add_address(
@@ -282,7 +514,7 @@ void flx_server_send_query(flxServer *s, gint interface, guchar protocol, flxKey
         flxInterface *i;
 
         for (i = flx_interface_monitor_get_first(s->monitor); i; i = i->interface_next)
-            flx_interface_send_query(i, protocol, k);
+            flx_interface_post_query(i, protocol, k);
         
     } else {
         flxInterface *i;
@@ -290,6 +522,6 @@ void flx_server_send_query(flxServer *s, gint interface, guchar protocol, flxKey
         if (!(i = flx_interface_monitor_get_interface(s->monitor, interface)))
             return;
 
-        flx_interface_send_query(i, protocol, k);
+        flx_interface_post_query(i, protocol, k);
     }
 }