IPv6 support.

all references to struct sockaddr/in_addr have been
removed from src/ngircd.
libngipaddr (in src/ipaddr/) hides all the gory details.
See src/ipaddr/ng_ipaddr.h for API description.

1 files changed, 115 insertions, 0 deletions

diff --git a/src/ipaddr/ng_ipaddr.h b/src/ipaddr/ng_ipaddr.h
new file mode 100644
index 00000000..1e198b0e
--- /dev/null
+++ b/src/ipaddr/ng_ipaddr.h
@@ -0,0 +1,115 @@
+/*
+ * Functions for AF_ agnostic ipv4/ipv6 handling.
+ *
+ * (c) 2008 Florian Westphal <fw@strlen.de>, public domain.
+ */
+
+#ifndef NG_IPADDR_HDR
+#define NG_IPADDR_HDR
+#include "portab.h"
+
+#ifdef HAVE_ARPA_INET_H
+# include <arpa/inet.h>
+#else
+# define PF_INET AF_INET
+#endif
+
+
+#ifdef WANT_IPV6
+#define NG_INET_ADDRSTRLEN	INET6_ADDRSTRLEN
+#else
+#define NG_INET_ADDRSTRLEN	16
+#endif
+
+
+#ifdef WANT_IPV6
+typedef union {
+	struct sockaddr sa;
+	struct sockaddr_in sin4;
+	struct sockaddr_in6 sin6;
+} ng_ipaddr_t;
+#else
+/* assume compiler can't deal with typedef struct {... */
+struct NG_IP_ADDR_DONTUSE {
+	struct sockaddr_in sin4;
+};
+typedef struct NG_IP_ADDR_DONTUSE ng_ipaddr_t;
+#endif
+
+
+static inline int
+ng_ipaddr_af(const ng_ipaddr_t *a)
+{
+#ifdef WANT_IPV6
+	return a->sa.sa_family;
+#else
+	assert(a->sin4.sin_family == 0 || a->sin4.sin_family == AF_INET);
+	return a->sin4.sin_family;
+#endif
+}
+
+
+static inline socklen_t
+ng_ipaddr_salen(const ng_ipaddr_t *a)
+{
+#ifdef WANT_IPV6
+	assert(a->sa.sa_family == AF_INET || a->sa.sa_family == AF_INET6);
+	if (a->sa.sa_family == AF_INET6)
+		return sizeof(a->sin6);
+#endif
+	assert(a->sin4.sin_family == AF_INET);
+	return sizeof(a->sin4);
+}
+
+
+static inline UINT16
+ng_ipaddr_getport(const ng_ipaddr_t *a)
+{
+#ifdef WANT_IPV6
+	int af = a->sa.sa_family;
+
+	assert(af == AF_INET || af == AF_INET6);
+
+	if (af == AF_INET6)
+		return ntohs(a->sin6.sin6_port);
+#endif /* WANT_IPV6 */
+	assert(a->sin4.sin_family == AF_INET);
+	return ntohs(a->sin4.sin_port);
+}
+
+/*
+ * init a ng_ipaddr_t object.
+ * @param addr: pointer to ng_ipaddr_t to initialize.
+ * @param ip_str: ip address in dotted-decimal (ipv4) or hexadecimal (ipv6) notation
+ *                if ip_str is NULL it is treated as 0.0.0.0/[::]
+ * @param port: transport layer port number to use.
+ */
+GLOBAL bool ng_ipaddr_init PARAMS((ng_ipaddr_t *addr, const char *ip_str, UINT16 port));
+
+/* set sin4/sin6_port, depending on a->sa_family */
+GLOBAL void ng_ipaddr_setport PARAMS((ng_ipaddr_t *a, UINT16 port));
+
+/* return true if a and b have the same IP address. If a and b have different AF, return false. */
+GLOBAL bool ng_ipaddr_ipequal PARAMS((const ng_ipaddr_t *a, const ng_ipaddr_t *b));
+
+
+#ifdef WANT_IPV6
+/* convert struct sockaddr to string, returns pointer to static buffer */
+GLOBAL const char *ng_ipaddr_tostr PARAMS((const ng_ipaddr_t *addr));
+
+/* convert struct sockaddr to string. dest must be NG_INET_ADDRSTRLEN bytes long */
+GLOBAL bool ng_ipaddr_tostr_r PARAMS((const ng_ipaddr_t *addr, char *dest));
+#else
+static inline const char *
+ng_ipaddr_tostr(const ng_ipaddr_t *addr) { return inet_ntoa(addr->sin4.sin_addr); }
+
+static inline bool
+ng_ipaddr_tostr_r(const ng_ipaddr_t *addr, char *d)
+{
+	strlcpy(d, inet_ntoa(addr->sin4.sin_addr), NG_INET_ADDRSTRLEN);
+	return true;
+}
+#endif
+#endif
+
+/* -eof- */