--- /dev/null
+/* -*-c-*-
+ *
+ * Background reverse name resolution
+ *
+ * (c) 1999 Straylight/Edgeware
+ */
+
+/*----- Licensing notice --------------------------------------------------*
+ *
+ * This file is part of the mLib utilities library.
+ *
+ * mLib is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU Library General Public License as
+ * published by the Free Software Foundation; either version 2 of the
+ * License, or (at your option) any later version.
+ *
+ * mLib 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 Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ * License along with mLib; if not, write to the Free
+ * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,
+ * MA 02111-1307, USA.
+ */
+
+#ifndef MLIB_RES_H
+#define MLIB_RES_H
+
+#ifdef __cplusplus
+ extern "C" {
+#endif
+
+/*----- Header files ------------------------------------------------------*/
+
+#include <sys/types.h>
+
+#include <sys/socket.h>
+#include <netinet/in.h>
+#include <arpa/inet.h>
+#include <netdb.h>
+
+#ifdef HAVE_ADNS
+# include <adns.h>
+#endif
+
+#ifndef MLIB_SEL_H
+# include "sel.h"
+#endif
+
+#ifndef MLIB_SELBUF_H
+# include "selbuf.h"
+#endif
+
+/*----- Data structures ---------------------------------------------------*/
+
+/* --- Client allocated request block --- */
+
+typedef struct bres_client {
+#ifdef HAVE_ADNS
+ adns_query aq; /* ADNS query handle */
+ adns_answer *a; /* Answer for reverse resolution */
+ struct _unused *_pad1; /* And a spare slot */
+#else
+ struct bres_client *next, *prev; /* Queue of waiting resolve jobs */
+ struct bres_server *rs; /* Pointer to attached server */
+#endif
+ int q; /* Query type (name or address) */
+ union {
+ struct in_addr addr; /* Address to resolve */
+ char *name; /* Name to resolve */
+ } u;
+ void (*func)(struct hostent */*h*/, void */*p*/); /* Handler function */
+ void *p; /* Argument for handler function */
+} bres_client;
+
+/* --- Server maintained resolver blocks --- */
+
+typedef struct bres_server {
+ struct bres_server *next, *prev; /* Doubly-linked list of servers */
+ pid_t kid; /* Process id of server process */
+ int fd; /* File descriptors */
+ struct bres_client *rc; /* Pointer to attached client */
+ sel_timer t; /* Timeout for idle servers */
+ sel_file f; /* Read selector for server */
+} bres_server;
+
+/*----- Functions provided ------------------------------------------------*/
+
+/* --- @bres_abort@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ *
+ * Returns: ---
+ *
+ * Use: Removes a queued job.
+ */
+
+extern void bres_abort(bres_client */*rc*/);
+
+/* --- @bres_byaddr@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ * @struct in_addr addr@ = address to resolve
+ * @void (*func)(struct hostent *h, void *p)@ = handler function
+ * @void *p@ = argument for handler function
+ *
+ * Returns: ---
+ *
+ * Use: Adds an address lookup job to the queue. The job will be
+ * processed when there's a spare resolver process to deal with
+ * it.
+ */
+
+extern void bres_byaddr(bres_client */*rc*/, struct in_addr /*addr*/,
+ void (*/*func*/)(struct hostent */*h*/, void */*p*/),
+ void */*p*/);
+
+/* --- @bres_byname@ --- *
+ *
+ * Arguments: @bres_client *rc@ = pointer to client block
+ * @const char *name@ = name to resolve
+ * @void (*func)(struct hostent *h, void *p)@ = handler function
+ * @void *p@ = argument for handler function
+ *
+ * Returns: ---
+ *
+ * Use: Adds a name lookup job to the queue. The job will be
+ * processed when there's a spare resolver process to deal with
+ * it.
+ */
+
+extern void bres_byname(bres_client */*rc*/, const char */*name*/,
+ void (*/*func*/)(struct hostent */*h*/, void */*p*/),
+ void */*p*/);
+
+/* --- @bres_exec@ --- *
+ *
+ * Arguments: @const char *file@ = file containing server code or null
+ *
+ * Returns: ---
+ *
+ * Use: Makes `bres' use a standalone server rather than copies of
+ * the current process. This can reduce memory consumption for
+ * large processes, at the expense of startup time (which
+ * shouldn't be too bad anyway, because of the resolver design).
+ * If the filename is null, a default set up at install time is
+ * used. It's probably a good idea to leave it alone.
+ */
+
+extern void bres_exec(const char */*file*/);
+
+/* --- @bres_init@ --- *
+ *
+ * Arguments: @sel_state *s@ = pointer to select multiplexor
+ *
+ * Returns: ---
+ *
+ * Use: Initializes the background resolver for use.
+ */
+
+extern void bres_init(sel_state */*s*/);
+
+/*----- That's all, folks -------------------------------------------------*/
+
+#ifdef __cplusplus
+ }
+#endif
+
+#endif
~mdw / mLib / blobdiff