Changeset 36e9f62 for lib

Timestamp:

2006-10-07T17:46:28Z (18 years ago)

Author:

Wilmer van der Gaast <wilmer@…>

Branches:

master

Children:

038d17f

Parents:

090f1cb

Message:

Added SRV lookups to automatically find out the correct server for a
domain.

Location:

lib

Files:

• misc.c (modified) (2 diffs)
• misc.h (modified) (2 diffs)

lib/misc.c

@@ -39 +39 @@
 #include <glib.h>
 #include <time.h>
+
+#ifdef HAVE_RESOLV_A
+#include <arpa/nameser.h>
+#include <resolv.h>
+#endif
 
 void strip_linefeed(gchar *text)
@@ -488 +493 @@
         return 0;
 }
+
+struct ns_srv_reply *srv_lookup( char *service, char *protocol, char *domain )
+{       
+        struct ns_srv_reply *reply = NULL;
+#ifdef HAVE_RESOLV_A
+        char name[1024];
+        unsigned char querybuf[1024];
+        const unsigned char *buf;
+        ns_msg nsh;
+        ns_rr rr;
+        int i, len, size;
+        
+        g_snprintf( name, sizeof( name ), "_%s._%s.%s", service, protocol, domain );
+        
+        if( ( size = res_query( name, ns_c_in, ns_t_srv, querybuf, sizeof( querybuf ) ) ) <= 0 )
+                return NULL;
+        
+        if( ns_initparse( querybuf, size, &nsh ) != 0 )
+                return NULL;
+        
+        if( ns_parserr( &nsh, ns_s_an, 0, &rr ) != 0 )
+                return NULL;
+        
+        size = ns_rr_rdlen( rr );
+        buf = ns_rr_rdata( rr );
+        
+        len = 0;
+        for( i = 6; i < size && buf[i]; i += buf[i] + 1 )
+                len += buf[i] + 1;
+        
+        if( i > size )
+                return NULL;
+        
+        reply = g_malloc( sizeof( struct ns_srv_reply ) + len );
+        memcpy( reply->name, buf + 7, len );
+        
+        for( i = buf[6]; i < len && buf[7+i]; i += buf[7+i] + 1 )
+                reply->name[i] = '.';
+        
+        if( i > len )
+        {
+                g_free( reply );
+                return NULL;
+        }
+        
+        reply->prio = ( buf[0] << 8 ) | buf[1];
+        reply->weight = ( buf[2] << 8 ) | buf[3];
+        reply->port = ( buf[4] << 8 ) | buf[5];
+#endif
+        
+        return reply;
+}

lib/misc.h

@@ -30 +30 @@
 #include <time.h>
 
+struct ns_srv_reply
+{
+        int prio;
+        int weight;
+        int port;
+        char name[];
+};
+
 G_MODULE_EXPORT void strip_linefeed( gchar *text );
 G_MODULE_EXPORT char *add_cr( char *text );
@@ -54 +62 @@
 G_MODULE_EXPORT int bool2int( char *value );
 
+G_MODULE_EXPORT struct ns_srv_reply *srv_lookup( char *service, char *protocol, char *domain );
+
 #endif