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authorSimo Sorce <idra@samba.org>2008-10-04 20:40:24 -0400
committerSimo Sorce <idra@samba.org>2008-10-04 20:40:24 -0400
commit8ef4f14632f88fc60a71fbe1365cb2a385449d93 (patch)
tree1adf91a6b0153d2895914716536210667bfa256f /server/nss/nsssrv.c
parent36c304580b49ea6ce445a68ac77b08405b983275 (diff)
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Add initial nss responder skeleton
Diffstat (limited to 'server/nss/nsssrv.c')
-rw-r--r--server/nss/nsssrv.c252
1 files changed, 252 insertions, 0 deletions
diff --git a/server/nss/nsssrv.c b/server/nss/nsssrv.c
new file mode 100644
index 00000000..c2826d27
--- /dev/null
+++ b/server/nss/nsssrv.c
@@ -0,0 +1,252 @@
+/*
+ SSSD
+
+ NSS Responder
+
+ Copyright (C) Simo Sorce <ssorce@redhat.com> 2008
+
+ 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 3 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, see <http://www.gnu.org/licenses/>.
+*/
+
+#include <stdio.h>
+#include <unistd.h>
+#include <fcntl.h>
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <sys/un.h>
+#include <string.h>
+#include <sys/time.h>
+#include "../events/events.h"
+#include "../talloc/talloc.h"
+#include "util/util.h"
+#include "service.h"
+#include "nss/nsssrv.h"
+
+struct nss_ctx {
+ struct task_server *task;
+ struct fd_event *lfde;
+ int lfd;
+};
+
+struct cli_ctx {
+ int cfd;
+ struct fd_event *cfde;
+ struct sockaddr_un addr;
+ struct cli_request *creq;
+};
+
+static void set_nonblocking(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFL, 0);
+ fcntl(fd, F_SETFL, v | O_NONBLOCK);
+}
+
+static void set_close_on_exec(int fd)
+{
+ unsigned v;
+ v = fcntl(fd, F_GETFD, 0);
+ fcntl(fd, F_SETFD, v | FD_CLOEXEC);
+}
+
+static int client_destructor(struct cli_ctx *ctx)
+{
+ if (ctx->cfd > 0) close(ctx->cfd);
+ return 0;
+}
+
+static void client_send(struct event_context *ev, struct cli_ctx *ctx)
+{
+ int ret;
+
+ ret = nss_packet_send(ctx->creq->out, ctx->cfd);
+ if (ret == RES_RETRY) {
+ /* not all data was sent, loop again */
+ return;
+ }
+ if (ret != RES_SUCCESS) {
+ DEBUG(0, ("Failed to read request, aborting client!\n"));
+ talloc_free(ctx);
+ return;
+ }
+
+ /* ok all sent */
+ EVENT_FD_NOT_WRITEABLE(ctx->cfde);
+ EVENT_FD_READABLE(ctx->cfde);
+ talloc_free(ctx->creq);
+ ctx->creq = NULL;
+ return;
+}
+
+static void client_recv(struct event_context *ev, struct cli_ctx *ctx)
+{
+ int ret;
+
+ if (!ctx->creq) {
+ ctx->creq = talloc_zero(ctx, struct cli_request);
+ if (!ctx->creq) {
+ DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+ talloc_free(ctx);
+ return;
+ }
+ }
+
+ if (!ctx->creq->in) {
+ ret = nss_packet_new(ctx->creq, 0, &ctx->creq->in);
+ if (ret != RES_SUCCESS) {
+ DEBUG(0, ("Failed to alloc request, aborting client!\n"));
+ talloc_free(ctx);
+ return;
+ }
+ }
+
+ ret = nss_packet_recv(ctx->creq->in, ctx->cfd);
+ switch (ret) {
+ case RES_SUCCESS:
+ /* do not read anymore */
+ EVENT_FD_NOT_READABLE(ctx->cfde);
+ /* execute command */
+ /* nss_cmd_execute(ctx); */
+ break;
+
+ case RES_RETRY:
+ /* need to read still some data, loop again */
+ break;
+
+ default:
+ DEBUG(0, ("Failed to read request, aborting client!\n"));
+ talloc_free(ctx);
+ }
+
+ return;
+}
+
+static void client_fd_handler(struct event_context *ev,
+ struct fd_event *fde,
+ uint16_t flags, void *ptr)
+{
+ struct cli_ctx *ctx = talloc_get_type(ptr, struct cli_ctx);
+
+ if (flags & EVENT_FD_READ) {
+ client_recv(ev, ctx);
+ return;
+ }
+ if (flags & EVENT_FD_WRITE) {
+ client_send(ev, ctx);
+ return;
+ }
+}
+
+static void accept_fd_handler(struct event_context *ev,
+ struct fd_event *fde,
+ uint16_t flags, void *ptr)
+{
+ /* accept and attach new event handler */
+ struct nss_ctx *ctx = talloc_get_type(ptr, struct nss_ctx);
+ struct cli_ctx *cctx;
+ socklen_t len;
+
+ cctx = talloc_zero(ctx, struct cli_ctx);
+ if (!cctx) {
+ struct sockaddr_un addr;
+ int fd;
+ DEBUG(0, ("Out of memory trying to setup client context!\n"));
+ /* accept and close to signal the client we have a problem */
+ memset(&addr, 0, sizeof(addr));
+ len = sizeof(addr);
+ fd = accept(ctx->lfd, (struct sockaddr *)&addr, &len);
+ if (fd == -1) {
+ return;
+ }
+ close(fd);
+ return;
+ }
+
+ len = sizeof(cctx->addr);
+ cctx->cfd = accept(ctx->lfd, (struct sockaddr *)&cctx->addr, &len);
+ if (cctx->cfd == -1) {
+ DEBUG(1, ("Accept failed [%s]", strerror(errno)));
+ talloc_free(cctx);
+ return;
+ }
+
+ cctx->cfde = event_add_fd(ev, cctx, cctx->cfd,
+ EVENT_FD_READ, client_fd_handler, cctx);
+ if (!cctx->cfde) {
+ close(cctx->cfd);
+ talloc_free(cctx);
+ DEBUG(1, ("Failed to queue client handler\n"));
+ }
+
+ talloc_set_destructor(cctx, client_destructor);
+
+ return;
+}
+
+/* create a unix socket and listen to it */
+static void set_unix_socket(struct event_context *ev,
+ struct nss_ctx *ctx,
+ const char *sock_name)
+{
+ struct sockaddr_un addr;
+
+ /* make sure we have no old sockets around */
+ unlink(sock_name);
+
+ ctx->lfd = socket(AF_UNIX, SOCK_STREAM, 0);
+ if (ctx->lfd == -1) {
+ return;
+ }
+
+ set_nonblocking(ctx->lfd);
+ set_close_on_exec(ctx->lfd);
+
+ memset(&addr, 0, sizeof(addr));
+ addr.sun_family = AF_UNIX;
+ strncpy(addr.sun_path, sock_name, sizeof(addr.sun_path));
+
+ if (bind(ctx->lfd, (struct sockaddr *)&addr, sizeof(addr)) == -1) {
+ DEBUG(0,("Unable to bind on socket '%s'\n", sock_name));
+ goto failed;
+ }
+ if (listen(ctx->lfd, 10) != 0) {
+ DEBUG(0,("Unable to listen on socket '%s'\n", sock_name));
+ goto failed;
+ }
+
+ ctx->lfde = event_add_fd(ev, ctx, ctx->lfd,
+ EVENT_FD_READ, accept_fd_handler, ctx);
+
+ return;
+
+failed:
+ close(ctx->lfd);
+}
+
+void nss_task_init(struct task_server *task)
+{
+ struct nss_ctx *ctx;
+
+ task_server_set_title(task, "sssd[nsssrv]");
+
+ ctx = talloc_zero(task, struct nss_ctx);
+ if (!ctx) {
+ task_server_terminate(task, "fatal error initializing nss_ctx\n");
+ return;
+ }
+ ctx->task = task;
+
+ set_unix_socket(task->event_ctx, ctx, SSS_NSS_SOCKET_NAME);
+
+}