--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/resolve.c Thu May 07 02:12:06 2009 +0300
@@ -0,0 +1,89 @@
+#include "resolve.h"
+
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <string.h>
+#include <stdio.h>
+
+err_t resolve_addr (struct resolve_result *res, const char *node, const char *service, int socktype, int ai_flags, error_t *err)
+{
+ struct addrinfo hints, *ai;
+ int ret;
+
+ // build hints
+ memset(&hints, 0, sizeof(hints));
+ hints.ai_flags = ai_flags;
+ hints.ai_family = AF_UNSPEC;
+ hints.ai_socktype = socktype;
+
+ // resolve (blocking)
+ if ((ret = getaddrinfo(node, service, &hints, &ai)))
+ RETURN_SET_ERROR_EXTRA(err, ERR_GETADDRINFO, ret);
+
+ // no results?
+ if (!ai)
+ RETURN_SET_ERROR(err, ERR_GETADDRINFO_EMPTY);
+
+ // store
+ res->list = res->item = ai;
+
+ // ok
+ return SUCCESS;
+}
+
+void resolve_result_init (struct resolve_result *res)
+{
+ res->list = res->item = NULL;
+}
+
+struct addrinfo* resolve_result_next (struct resolve_result *res)
+{
+ if (!res->item) {
+ // no items left
+ return NULL;
+
+ } else {
+ // ...remember the current item
+ struct addrinfo *ai = res->item;
+
+ if (res->item)
+ // advance item to the next one
+ res->item = res->item->ai_next;
+
+ // return the current one
+ return ai;
+ }
+}
+
+void resolve_result_deinit (struct resolve_result *res)
+{
+ if (res->list)
+ // free them all
+ freeaddrinfo(res->list);
+
+ // invalidate
+ res->list = res->item = NULL;
+}
+
+const char * resolve_addr_text (const struct addrinfo *addr)
+{
+ static char text[1024];
+ char host[NI_MAXHOST], service[NI_MAXSERV];
+ int ret;
+
+ // lookup the reverse nameinfo
+ if ((ret = getnameinfo(
+ addr->ai_addr, addr->ai_addrlen,
+ host, sizeof(host), service, sizeof(service),
+ AI_NUMERICHOST | AI_NUMERICSERV
+ ))) {
+ strcpy(host, "???");
+ strcpy(service, "???");
+ }
+
+ // format message
+ snprintf(text, sizeof(text), "[%s]:%s", host, service);
+
+ // return static pointer
+ return text;
+}
--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/src/resolve.h Thu May 07 02:12:06 2009 +0300
@@ -0,0 +1,59 @@
+#ifndef RESOLVE_H
+#define RESOLVE_H
+
+/**
+ * @file
+ *
+ * DNS resolver interface
+ */
+#include "error.h"
+#include <netdb.h>
+
+/**
+ * Lookup result state
+ */
+struct resolve_result {
+ /** Head of the addrinfo list */
+ struct addrinfo *list;
+
+ /** Current addrinfo item */
+ struct addrinfo *item;
+};
+
+/**
+ * Resolve the given node/service tuple as a series of addrinfos for the given socktype.
+ *
+ * This will never return an empty result.
+ *
+ * XXX: blocking DNS stuff
+ *
+ * @param res where to store the result state
+ * @param node hostname/address to look up
+ * @param service service/port to look up
+ * @param socktype a SOCK_* value to return addrinfo's for that socktype
+ * @param ai_flags optional bitmask of AI_* flags to use
+ * @param err returned error info
+ */
+err_t resolve_addr (struct resolve_result *res, const char *node, const char *service, int socktype, int ai_flags, error_t *err);
+
+/**
+ * Initialize the given result to zero
+ */
+void resolve_result_init (struct resolve_result *res);
+
+/**
+ * Get the next address from a result, if any left
+ */
+struct addrinfo* resolve_result_next (struct resolve_result *res);
+
+/**
+ * Release the addrinfo resources associated with the given result
+ */
+void resolve_result_deinit (struct resolve_result *res);
+
+/**
+ * Returns a pointer to a static buffer containing a string description of the given addrinfo
+ */
+const char * resolve_addr_text (const struct addrinfo *addr);
+
+#endif /* RESOLVE_H */