misc: add ipaddr6

misc/ipaddr6.h

@@ -0,0 +1,79 @@
+/**
+ * @file ipaddr6.h
+ * @author Ambroz Bizjak <ambrop7@gmail.com>
+ * 
+ * @section LICENSE
+ * 
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions and the following disclaimer.
+ * 2. Redistributions in binary form must reproduce the above copyright
+ *    notice, this list of conditions and the following disclaimer in the
+ *    documentation and/or other materials provided with the distribution.
+ * 3. Neither the name of the author nor the
+ *    names of its contributors may be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ * 
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
+ * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ * 
+ * @section DESCRIPTION
+ * 
+ * IPv6 address parsing functions.
+ */
+
+#ifndef BADVPN_MISC_IPADDR6_H
+#define BADVPN_MISC_IPADDR6_H
+
+#include <stdint.h>
+#include <string.h>
+#include <netdb.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#include <misc/debug.h>
+
+// from /etc/iproute2/rt_scopes
+#define IPADDR6_SCOPE_GLOBAL 0
+#define IPADDR6_SCOPE_HOST 254
+#define IPADDR6_SCOPE_LINK 253
+#define IPADDR6_SCOPE_SITE 200
+
+struct ipv6_ifaddr {
+    uint8_t addr[16];
+    int prefix;
+    int scope;
+};
+
+#define IPADDR6_PRINT_MAX INET6_ADDRSTRLEN
+
+static int ipaddr6_print_addr (const uint8_t *addr, char *out_buf) WARN_UNUSED;
+
+
+int ipaddr6_print_addr (const uint8_t *addr, char *out_buf)
+{
+    struct sockaddr_in6 a;
+    memset(&a, 0, sizeof(a));
+    a.sin6_family = AF_INET6;
+    a.sin6_port = 0;
+    a.sin6_flowinfo= 0;
+    memcpy(a.sin6_addr.s6_addr, addr, 16);
+    a.sin6_scope_id = 0;
+    
+    if (getnameinfo((struct sockaddr *)&a, sizeof(a), out_buf, IPADDR6_PRINT_MAX, NULL, 0, NI_NUMERICHOST) < 0) {
+        return 0;
+    }
+    
+    return 1;
+}
+
+#endif