diff options
Diffstat (limited to 'lib/misc.c')
| -rw-r--r-- | lib/misc.c | 57 |
1 files changed, 57 insertions, 0 deletions
@@ -39,6 +39,11 @@ #include <glib.h> #include <time.h> +#ifdef HAVE_RESOLV_A +#include <arpa/nameser.h> +#include <resolv.h> +#endif + void strip_linefeed(gchar *text) { int i, j; @@ -487,3 +492,55 @@ int bool2int( char *value ) 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; +} |