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-rw-r--r--source3/libsmb/async_smb.c87
1 files changed, 87 insertions, 0 deletions
diff --git a/source3/libsmb/async_smb.c b/source3/libsmb/async_smb.c
index 7474959902..7afba0dae9 100644
--- a/source3/libsmb/async_smb.c
+++ b/source3/libsmb/async_smb.c
@@ -19,6 +19,93 @@
#include "includes.h"
+/*
+ * Read an smb packet asynchronously, discard keepalives
+ */
+
+struct read_smb_state {
+ struct tevent_context *ev;
+ int fd;
+ uint8_t *buf;
+};
+
+static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data);
+static void read_smb_done(struct tevent_req *subreq);
+
+static struct tevent_req *read_smb_send(TALLOC_CTX *mem_ctx,
+ struct tevent_context *ev,
+ int fd)
+{
+ struct tevent_req *result, *subreq;
+ struct read_smb_state *state;
+
+ result = tevent_req_create(mem_ctx, &state, struct read_smb_state);
+ if (result == NULL) {
+ return NULL;
+ }
+ state->ev = ev;
+ state->fd = fd;
+
+ subreq = read_packet_send(state, ev, fd, 4, read_smb_more, NULL);
+ if (subreq == NULL) {
+ goto fail;
+ }
+ tevent_req_set_callback(subreq, read_smb_done, result);
+ return result;
+ fail:
+ TALLOC_FREE(result);
+ return NULL;
+}
+
+static ssize_t read_smb_more(uint8_t *buf, size_t buflen, void *private_data)
+{
+ if (buflen > 4) {
+ return 0; /* We've been here, we're done */
+ }
+ return smb_len_large(buf);
+}
+
+static void read_smb_done(struct tevent_req *subreq)
+{
+ struct tevent_req *req = tevent_req_callback_data(
+ subreq, struct tevent_req);
+ struct read_smb_state *state = tevent_req_data(
+ req, struct read_smb_state);
+ ssize_t len;
+ int err;
+
+ len = read_packet_recv(subreq, state, &state->buf, &err);
+ TALLOC_FREE(subreq);
+ if (len == -1) {
+ tevent_req_error(req, err);
+ return;
+ }
+
+ if (CVAL(state->buf, 0) == SMBkeepalive) {
+ subreq = read_packet_send(state, state->ev, state->fd, 4,
+ read_smb_more, NULL);
+ if (tevent_req_nomem(subreq, req)) {
+ return;
+ }
+ tevent_req_set_callback(subreq, read_smb_done, req);
+ return;
+ }
+ tevent_req_done(req);
+}
+
+static ssize_t read_smb_recv(struct tevent_req *req, TALLOC_CTX *mem_ctx,
+ uint8_t **pbuf, int *perrno)
+{
+ struct read_smb_state *state = tevent_req_data(
+ req, struct read_smb_state);
+
+ if (tevent_req_is_unix_error(req, perrno)) {
+ return -1;
+ }
+ *pbuf = talloc_move(mem_ctx, &state->buf);
+ return talloc_get_size(*pbuf);
+}
+
/**
* Fetch an error out of a NBT packet
* @param[in] buf The SMB packet