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authorMax Kellermann <max@duempel.org>2011-09-20 20:51:46 +0200
committerMax Kellermann <max@duempel.org>2011-09-20 21:15:05 +0200
commit7d9d459ac2c71e0b3598ed0f606cd2d550853838 (patch)
tree881821c611654010287da59eb27d50cac79a49f5 /src
parent3ea1073809bf324e5b75fd33d61dcb0422463358 (diff)
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resolver: add function resolve_host_port()
Diffstat (limited to 'src')
-rw-r--r--src/resolver.c63
-rw-r--r--src/resolver.h23
2 files changed, 84 insertions, 2 deletions
diff --git a/src/resolver.c b/src/resolver.c
index 81099b2af..e50642b1e 100644
--- a/src/resolver.c
+++ b/src/resolver.c
@@ -19,6 +19,7 @@
#include "config.h"
#include "resolver.h"
+#include "glib_compat.h"
#ifndef G_OS_WIN32
#include <sys/socket.h>
@@ -29,9 +30,7 @@
#include <winsock.h>
#endif /* G_OS_WIN32 */
-#ifdef HAVE_IPV6
#include <string.h>
-#endif
char *
sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error)
@@ -81,3 +80,63 @@ sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error)
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;
+}
diff --git a/src/resolver.h b/src/resolver.h
index 179f8fd75..8d5cb187e 100644
--- a/src/resolver.h
+++ b/src/resolver.h
@@ -23,6 +23,14 @@
#include <glib.h>
struct sockaddr;
+struct addrinfo;
+
+G_GNUC_CONST
+static inline GQuark
+resolver_quark(void)
+{
+ return g_quark_from_static_string("resolver");
+}
/**
* Converts the specified socket address into a string in the form
@@ -37,4 +45,19 @@ struct sockaddr;
char *
sockaddr_to_string(const struct sockaddr *sa, size_t length, GError **error);
+/**
+ * Resolve a specification in the form "host", "host:port",
+ * "[host]:port". This is a convenience wrapper for getaddrinfo().
+ *
+ * @param default_port a default port number that will be used if none
+ * is given in the string (if applicable); pass 0 to go without a
+ * default
+ * @return an #addrinfo linked list that must be freed with
+ * freeaddrinfo(), or NULL on error
+ */
+struct addrinfo *
+resolve_host_port(const char *host_port, unsigned default_port,
+ int flags, int socktype,
+ GError **error_r);
+
#endif