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.

src/ipaddr/ng_ipaddr.c

@@ -0,0 +1,170 @@
+/*
+ * Functions for AF_ agnostic ipv4/ipv6 handling.
+ *
+ * (c) 2008 Florian Westphal <fw@strlen.de>, public domain.
+ */
+
+#include "portab.h"
+
+#include <assert.h>
+#include <stdio.h>
+#include <string.h>
+
+#ifdef HAVE_GETADDRINFO
+#include <netdb.h>
+#include <sys/types.h>
+#endif
+#include <sys/socket.h>
+
+#include <netinet/in.h>
+
+#include "ng_ipaddr.h"
+
+GLOBAL bool
+ng_ipaddr_init(ng_ipaddr_t *addr, const char *ip_str, UINT16 port)
+{
+#ifdef HAVE_GETADDRINFO
+	int ret;
+	char portstr[64];
+	struct addrinfo *res0;
+	struct addrinfo hints = {
+#ifndef WANT_IPV6	/* only accept v4 addresses */
+		.ai_family = AF_INET,
+#endif
+		.ai_flags = AI_NUMERICHOST
+	};
+
+	if (ip_str == NULL)
+		hints.ai_flags |= AI_PASSIVE;
+
+	/* silly, but ngircd stores UINT16 in server config, not string */
+	snprintf(portstr, sizeof(portstr), "%u", (unsigned int) port);
+	ret = getaddrinfo(ip_str, portstr, &hints, &res0);
+	assert(ret == 0);
+	if (ret != 0)
+		return false;
+
+	assert(sizeof(*addr) >= res0->ai_addrlen);
+	if (sizeof(*addr) >= res0->ai_addrlen)
+		memcpy(addr, res0->ai_addr, res0->ai_addrlen);
+	else
+		ret = -1;
+	freeaddrinfo(res0);
+	return ret == 0;
+#else /* HAVE_GETADDRINFO */
+	if (ip_str == NULL)
+		ip_str = "0.0.0.0";
+	addr->sin4.sin_family = AF_INET;
+# ifdef HAVE_INET_ATON
+	if (inet_aton(ip_str, &addr->sin4.sin_addr) == 0)
+		return false;
+# else
+	addr->sin4.sin_addr.s_addr = inet_addr(ip_str);
+	if (addr->sin4.sin_addr.s_addr == (unsigned) -1)
+		return false;
+# endif
+	ng_ipaddr_setport(addr, port);
+	return true;
+#endif /* HAVE_GETADDRINFO */
+}
+
+
+GLOBAL void
+ng_ipaddr_setport(ng_ipaddr_t *a, UINT16 port)
+{
+#ifdef WANT_IPV6
+	int af;
+
+	assert(a != NULL);
+
+	af = a->sa.sa_family;
+
+	assert(af == AF_INET || af == AF_INET6);
+
+	switch (af) {
+	case AF_INET:
+		a->sin4.sin_port = htons(port);
+		break;
+	case AF_INET6:
+		a->sin6.sin6_port = htons(port);
+		break;
+	}
+#else /* WANT_IPV6 */
+	assert(a != NULL);
+	assert(a->sin4.sin_family == AF_INET);
+	a->sin4.sin_port = htons(port);
+#endif /* WANT_IPV6 */
+}
+
+
+
+GLOBAL bool
+ng_ipaddr_ipequal(const ng_ipaddr_t *a, const ng_ipaddr_t *b)
+{
+	assert(a != NULL);
+	assert(b != NULL);
+#ifdef WANT_IPV6
+	if (a->sa.sa_family != b->sa.sa_family)
+		return false;
+	assert(ng_ipaddr_salen(a) == ng_ipaddr_salen(b));
+	switch (a->sa.sa_family) {
+	case AF_INET6:
+		return IN6_ARE_ADDR_EQUAL(&a->sin6.sin6_addr, &b->sin6.sin6_addr);
+	case AF_INET:
+		return memcmp(&a->sin4.sin_addr, &b->sin4.sin_addr, sizeof(a->sin4.sin_addr)) == 0;
+	}
+	return false;
+#else
+	assert(a->sin4.sin_family == AF_INET);
+	assert(b->sin4.sin_family == AF_INET);
+	return memcmp(&a->sin4.sin_addr, &b->sin4.sin_addr, sizeof(a->sin4.sin_addr)) == 0;
+#endif
+}
+
+
+#ifdef WANT_IPV6
+GLOBAL const char *
+ng_ipaddr_tostr(const ng_ipaddr_t *addr)
+{
+	static char strbuf[NG_INET_ADDRSTRLEN];
+
+	strbuf[0] = 0;
+
+	ng_ipaddr_tostr_r(addr, strbuf);
+	return strbuf;
+}
+
+
+/* str must be at least NG_INET_ADDRSTRLEN bytes long */
+GLOBAL bool
+ng_ipaddr_tostr_r(const ng_ipaddr_t *addr, char *str)
+{
+#ifdef HAVE_GETNAMEINFO
+	const struct sockaddr *sa = (const struct sockaddr *) addr;
+	int ret;
+
+	*str = 0;
+
+	ret = getnameinfo(sa, ng_ipaddr_salen(addr),
+			str, NG_INET_ADDRSTRLEN, NULL, 0, NI_NUMERICHOST);
+	/*
+	 * avoid leading ':'.
+	 * causes mis-interpretation of client host in e.g. /WHOIS
+	 */
+	if (*str == ':') {
+		char tmp[NG_INET_ADDRSTRLEN] = "0";
+		ret = getnameinfo(sa, ng_ipaddr_salen(addr),
+				tmp+1, sizeof(tmp) -1, NULL, 0, NI_NUMERICHOST);
+		if (ret == 0)
+			strlcpy(str, tmp, NG_INET_ADDRSTRLEN);
+	}
+	assert (ret == 0);
+	return ret == 0;
+#else
+	abort(); /* WANT_IPV6 depends on HAVE_GETNAMEINFO */
+#endif
+}
+
+#endif /* WANT_IPV6 */
+
+/* -eof- */