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-rw-r--r--src/resolver.c141
1 files changed, 141 insertions, 0 deletions
diff --git a/src/resolver.c b/src/resolver.c
new file mode 100644
index 000000000..5d8d299c6
--- /dev/null
+++ b/src/resolver.c
@@ -0,0 +1,141 @@
+/*
+ * Copyright (C) 2003-2011 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#include "config.h"
+#include "resolver.h"
+#include "glib_compat.h"
+
+#ifndef G_OS_WIN32
+#include <sys/socket.h>
+#include <netdb.h>
+#else /* G_OS_WIN32 */
+#include <ws2tcpip.h>
+#include <winsock.h>
+#endif /* G_OS_WIN32 */
+
+#include <string.h>
+
+char *
+sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error)
+{
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
+ const struct sockaddr_in6 *a6 = (const struct sockaddr_in6 *)sa;
+ struct sockaddr_in a4;
+#endif
+ int ret;
+ char host[NI_MAXHOST], serv[NI_MAXSERV];
+
+#if defined(HAVE_IPV6) && defined(IN6_IS_ADDR_V4MAPPED)
+ if (sa->sa_family == AF_INET6 &&
+ IN6_IS_ADDR_V4MAPPED(&a6->sin6_addr)) {
+ /* convert "::ffff:127.0.0.1" to "127.0.0.1" */
+
+ memset(&a4, 0, sizeof(a4));
+ a4.sin_family = AF_INET;
+ memcpy(&a4.sin_addr, ((const char *)&a6->sin6_addr) + 12,
+ sizeof(a4.sin_addr));
+ a4.sin_port = a6->sin6_port;
+
+ sa = (const struct sockaddr *)&a4;
+ length = sizeof(a4);
+ }
+#endif
+
+ ret = getnameinfo(sa, length, host, sizeof(host), serv, sizeof(serv),
+ NI_NUMERICHOST|NI_NUMERICSERV);
+ if (ret != 0) {
+ g_set_error(error, g_quark_from_static_string("netdb"), ret,
+ "%s", gai_strerror(ret));
+ return NULL;
+ }
+
+#ifdef HAVE_UN
+ if (sa->sa_family == AF_UNIX)
+ /* "serv" contains corrupt information with unix
+ sockets */
+ return g_strdup(host);
+#endif
+
+#ifdef HAVE_IPV6
+ if (strchr(host, ':') != NULL)
+ return g_strconcat("[", host, "]:", serv, NULL);
+#endif
+
+ return g_strconcat(host, ":", serv, NULL);
+}
+
+struct addrinfo *
+resolve_host_port(const char *host_port, unsigned default_port,
+ int flags, int socktype,
+ GError **error_r)
+{
+ char *p = g_strdup(host_port);
+ const char *host = p, *port = NULL;
+
+ if (host_port[0] == '[') {
+ /* IPv6 needs enclosing square braces, to
+ differentiate between IP colons and the port
+ separator */
+
+ char *q = strchr(p + 1, ']');
+ if (q != NULL && q[1] == ':' && q[2] != 0) {
+ *q = 0;
+ ++host;
+ port = q + 2;
+ }
+ }
+
+ if (port == NULL) {
+ /* port is after the colon, but only if it's the only
+ colon (don't split IPv6 addresses) */
+
+ char *q = strchr(p, ':');
+ if (q != NULL && q[1] != 0 && strchr(q + 1, ':') == NULL) {
+ *q = 0;
+ port = q + 1;
+ }
+ }
+
+ char buffer[32];
+ if (port == NULL && default_port != 0) {
+ g_snprintf(buffer, sizeof(buffer), "%u", default_port);
+ port = buffer;
+ }
+
+ if ((flags & AI_PASSIVE) != 0 && strcmp(host, "*") == 0)
+ host = NULL;
+
+ const struct addrinfo hints = {
+ .ai_flags = flags,
+ .ai_family = AF_UNSPEC,
+ .ai_socktype = socktype,
+ };
+
+ struct addrinfo *ai;
+ int ret = getaddrinfo(host, port, &hints, &ai);
+ g_free(p);
+ if (ret != 0) {
+ g_set_error(error_r, resolver_quark(), ret,
+ "Failed to look up '%s': %s",
+ host_port, gai_strerror(ret));
+ return NULL;
+ }
+
+ return ai;
+}