general name resolution interface
Copyright (C) Andrew Tridgell 2005
+ Copyright (C) Jelmer Vernooij 2007
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
#include "librpc/gen_ndr/ndr_nbt.h"
#include "param/param.h"
#include "system/network.h"
+#include "util/dlinklist.h"
struct resolve_state {
+ struct resolve_context *ctx;
+ struct resolve_method *method;
struct nbt_name name;
- const char **methods;
struct composite_context *creq;
const char *reply_addr;
};
static struct composite_context *setup_next_method(struct composite_context *c);
-/* pointers to the resolver backends */
-static const struct resolve_method {
- const char *name;
- struct composite_context *(*send_fn)(TALLOC_CTX *mem_ctx, struct event_context *, struct nbt_name *);
- NTSTATUS (*recv_fn)(struct composite_context *, TALLOC_CTX *, const char **);
-} resolve_methods[] = {
- { "bcast", resolve_name_bcast_send, resolve_name_bcast_recv },
- { "wins", resolve_name_wins_send, resolve_name_wins_recv },
- { "host", resolve_name_host_send, resolve_name_host_recv }
+struct resolve_context {
+ struct resolve_method {
+ resolve_name_send_fn send_fn;
+ resolve_name_recv_fn recv_fn;
+ void *privdata;
+ struct resolve_method *prev, *next;
+ } *methods;
};
+/**
+ * Initialize a resolve context
+ */
+struct resolve_context *resolve_context_init(TALLOC_CTX *mem_ctx)
+{
+ return talloc_zero(mem_ctx, struct resolve_context);
+}
-/*
- find a matching backend
-*/
-static const struct resolve_method *find_method(const char *name)
+/**
+ * Add a resolve method
+ */
+bool resolve_context_add_method(struct resolve_context *ctx, resolve_name_send_fn send_fn,
+ resolve_name_recv_fn recv_fn, void *userdata)
{
- int i;
- if (name == NULL) return NULL;
- for (i=0;i<ARRAY_SIZE(resolve_methods);i++) {
- if (strcasecmp(name, resolve_methods[i].name) == 0) {
- return &resolve_methods[i];
- }
- }
- return NULL;
+ struct resolve_method *method = talloc_zero(ctx, struct resolve_method);
+
+ if (method == NULL)
+ return false;
+
+ method->send_fn = send_fn;
+ method->recv_fn = recv_fn;
+ method->privdata = userdata;
+ DLIST_ADD_END(ctx->methods, method, struct resolve_method *);
+ return true;
}
-/*
+/**
handle completion of one name resolve method
*/
static void resolve_handler(struct composite_context *creq)
{
struct composite_context *c = (struct composite_context *)creq->async.private_data;
struct resolve_state *state = talloc_get_type(c->private_data, struct resolve_state);
- const struct resolve_method *method = find_method(state->methods[0]);
+ const struct resolve_method *method = state->method;
c->status = method->recv_fn(creq, state, &state->reply_addr);
if (!NT_STATUS_IS_OK(c->status)) {
- state->methods++;
+ state->method = state->method->next;
state->creq = setup_next_method(c);
if (state->creq != NULL) {
return;
struct composite_context *creq = NULL;
do {
- const struct resolve_method *method = find_method(state->methods[0]);
- if (method) {
- creq = method->send_fn(c, c->event_ctx, &state->name);
+ if (state->method) {
+ creq = state->method->send_fn(c, c->event_ctx, state->method->privdata, &state->name);
}
- if (creq == NULL && state->methods[0]) state->methods++;
+ if (creq == NULL && state->method) state->method = state->method->next;
- } while (!creq && state->methods[0]);
+ } while (!creq && state->method);
if (creq) {
creq->async.fn = resolve_handler;
/*
general name resolution - async send
*/
-struct composite_context *resolve_name_send(struct nbt_name *name, struct event_context *event_ctx,
- const char **methods)
+struct composite_context *resolve_name_send(struct resolve_context *ctx,
+ struct nbt_name *name,
+ struct event_context *event_ctx)
{
struct composite_context *c;
struct resolve_state *state;
c = composite_create(event_ctx, event_ctx);
if (c == NULL) return NULL;
- if (methods == NULL) {
+ if (ctx == NULL) {
composite_error(c, NT_STATUS_INVALID_PARAMETER);
return c;
}
c->status = nbt_name_dup(state, name, &state->name);
if (!composite_is_ok(c)) return c;
- state->methods = str_list_copy(state, methods);
- if (composite_nomem(state->methods, c)) return c;
+ state->ctx = talloc_reference(state, ctx);
+ if (composite_nomem(state->ctx, c)) return c;
if (is_ipaddress(state->name.name) ||
strcasecmp(state->name.name, "localhost") == 0) {
return c;
}
+ state->method = ctx->methods;
state->creq = setup_next_method(c);
if (composite_nomem(state->creq, c)) return c;
/*
general name resolution - sync call
*/
-NTSTATUS resolve_name(struct nbt_name *name, TALLOC_CTX *mem_ctx, const char **reply_addr, struct event_context *ev, const char **name_resolve_order)
+NTSTATUS resolve_name(struct resolve_context *ctx, struct nbt_name *name, TALLOC_CTX *mem_ctx, const char **reply_addr, struct event_context *ev)
{
- struct composite_context *c = resolve_name_send(name, ev, name_resolve_order);
+ struct composite_context *c = resolve_name_send(ctx, name, ev);
return resolve_name_recv(c, mem_ctx, reply_addr);
}
{
make_nbt_name(nbt, name, NBT_NAME_SERVER);
}
+
+struct resolve_context *lp_resolve_context(struct loadparm_context *lp_ctx)
+{
+ const char **methods = lp_name_resolve_order(lp_ctx);
+ int i;
+ struct resolve_context *ret = resolve_context_init(lp_ctx);
+
+ if (ret == NULL)
+ return NULL;
+
+ for (i = 0; methods != NULL && methods[i] != NULL; i++) {
+ if (!strcmp(methods[i], "wins")) {
+ resolve_context_add_wins_method(ret, lp_wins_server_list(lp_ctx));
+ } else if (!strcmp(methods[i], "bcast")) {
+ resolve_context_add_bcast_method(ret);
+ } else if (!strcmp(methods[i], "host")) {
+ resolve_context_add_host_method(ret);
+ } else {
+ DEBUG(0, ("Unknown resolve method '%s'", methods[i]));
+ }
+ }
+
+ return ret;
+}
git.samba.org / samba-svnmirror.git / blobdiff