gluster-blockd: daemonize the utility

this patch,
deprecate ssh way of communicating between server nodes/pods
Reason: ssh way is hard to be accepted in container world (Kube).
        An another option kubeExec way seems to be a bit weird,
        to have uniform way of communication in container and
        non container worlds, we prefer RPC.

From now we communicate via RPC, using a static port 24009

Hence, we have two components,
server component -> gluster-blockd (daemon)
client component -> gluster-block  (cli)

Signed-off-by: Prasanna Kumar Kalever <prasanna.kalever@redhat.com>

5 files changed, 208 insertions, 0 deletions

diff --git a/rpc/block.h b/rpc/block.h
new file mode 100644
index 0000000..54315b7
--- /dev/null
+++ b/rpc/block.h
@@ -0,0 +1,53 @@
+/*
+ * Please do not edit this file.
+ * It was generated using rpcgen.
+ */
+
+#ifndef _BLOCK_H_RPCGEN
+#define _BLOCK_H_RPCGEN
+
+#include <rpc/rpc.h>
+
+
+#ifdef __cplusplus
+extern "C" {
+#endif
+
+
+struct blockTrans {
+	int exit;
+	char *out;
+};
+typedef struct blockTrans blockTrans;
+
+#define GLUSTER_BLOCK 21215311
+#define GLUSTER_BLOCK_VERS 1
+
+#if defined(__STDC__) || defined(__cplusplus)
+#define BLOCK_EXEC 1
+extern  blockTrans * block_exec_1(char **, CLIENT *);
+extern  blockTrans * block_exec_1_svc(char **, struct svc_req *);
+extern int gluster_block_1_freeresult (SVCXPRT *, xdrproc_t, caddr_t);
+
+#else /* K&R C */
+#define BLOCK_EXEC 1
+extern  blockTrans * block_exec_1();
+extern  blockTrans * block_exec_1_svc();
+extern int gluster_block_1_freeresult ();
+#endif /* K&R C */
+
+/* the xdr functions */
+
+#if defined(__STDC__) || defined(__cplusplus)
+extern  bool_t xdr_blockTrans (XDR *, blockTrans*);
+
+#else /* K&R C */
+extern bool_t xdr_blockTrans ();
+
+#endif /* K&R C */
+
+#ifdef __cplusplus
+}
+#endif
+
+#endif /* !_BLOCK_H_RPCGEN */
diff --git a/rpc/block.x b/rpc/block.x
new file mode 100644
index 0000000..c88fdf2
--- /dev/null
+++ b/rpc/block.x
@@ -0,0 +1,12 @@
+
+
+struct blockTrans {
+  int     exit;    /* exit code of the command */
+  string  out<>;   /* stdout of the command */
+};
+
+program GLUSTER_BLOCK {
+  version GLUSTER_BLOCK_VERS {
+    blockTrans BLOCK_EXEC(string) = 1;
+  } = 1;
+} = 21215311; /* B2 L12 O15 C3 K11 */
diff --git a/rpc/block_clnt.c b/rpc/block_clnt.c
new file mode 100644
index 0000000..9e5b585
--- /dev/null
+++ b/rpc/block_clnt.c
@@ -0,0 +1,25 @@
+/*
+ * Please do not edit this file.
+ * It was generated using rpcgen.
+ */
+
+#include <memory.h> /* for memset */
+#include "block.h"
+
+/* Default timeout can be changed using clnt_control() */
+static struct timeval TIMEOUT = { 25, 0 };
+
+blockTrans *
+block_exec_1(char **argp, CLIENT *clnt)
+{
+	static blockTrans clnt_res;
+
+	memset((char *)&clnt_res, 0, sizeof(clnt_res));
+	if (clnt_call (clnt, BLOCK_EXEC,
+		(xdrproc_t) xdr_wrapstring, (caddr_t) argp,
+		(xdrproc_t) xdr_blockTrans, (caddr_t) &clnt_res,
+		TIMEOUT) != RPC_SUCCESS) {
+		return (NULL);
+	}
+	return (&clnt_res);
+}
diff --git a/rpc/block_svc.c b/rpc/block_svc.c
new file mode 100644
index 0000000..144b7e1
--- /dev/null
+++ b/rpc/block_svc.c
@@ -0,0 +1,102 @@
+/*
+ * Please do not edit this file.
+ * It was generated using rpcgen.
+ */
+
+#include "block.h"
+#include <stdio.h>
+#include <stdlib.h>
+#include <rpc/pmap_clnt.h>
+#include <string.h>
+#include <memory.h>
+#include <sys/socket.h>
+#include <netinet/in.h>
+
+#ifndef SIG_PF
+#define SIG_PF void(*)(int)
+#endif
+
+static void
+gluster_block_1(struct svc_req *rqstp, register SVCXPRT *transp)
+{
+	union {
+		char *block_exec_1_arg;
+	} argument;
+	char *result;
+	xdrproc_t _xdr_argument, _xdr_result;
+	char *(*local)(char *, struct svc_req *);
+
+	switch (rqstp->rq_proc) {
+	case NULLPROC:
+		(void) svc_sendreply (transp, (xdrproc_t) xdr_void, (char *)NULL);
+		return;
+
+	case BLOCK_EXEC:
+		_xdr_argument = (xdrproc_t) xdr_wrapstring;
+		_xdr_result = (xdrproc_t) xdr_blockTrans;
+		local = (char *(*)(char *, struct svc_req *)) block_exec_1_svc;
+		break;
+
+	default:
+		svcerr_noproc (transp);
+		return;
+	}
+	memset ((char *)&argument, 0, sizeof (argument));
+	if (!svc_getargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
+		svcerr_decode (transp);
+		return;
+	}
+	result = (*local)((char *)&argument, rqstp);
+	if (result != NULL && !svc_sendreply(transp, (xdrproc_t) _xdr_result, result)) {
+		svcerr_systemerr (transp);
+	}
+	if (!svc_freeargs (transp, (xdrproc_t) _xdr_argument, (caddr_t) &argument)) {
+		fprintf (stderr, "%s", "unable to free arguments");
+		exit (1);
+	}
+	return;
+}
+
+int
+main (int argc, char **argv)
+{
+	register SVCXPRT *transp;
+  struct sockaddr_in addr;
+  int sockfd;
+
+	pmap_unset (GLUSTER_BLOCK, GLUSTER_BLOCK_VERS);
+
+  if ((sockfd = socket(AF_INET, SOCK_STREAM, IPPROTO_TCP)) < 0) {
+		fprintf (stderr, "%s", "socket failed");
+  }
+
+  addr.sin_family = AF_INET;
+  addr.sin_addr.s_addr = INADDR_ANY;
+  addr.sin_port = htons(24009);
+
+  if (bind(sockfd, (struct sockaddr *)&addr, sizeof (addr)) < 0) {
+		fprintf (stderr, "%s", "bind failed");
+  }
+
+  if (listen(sockfd, 10) < 0) {
+		fprintf (stderr, "%s", "server: listen failed");
+    exit(1);
+  }
+
+	transp = svctcp_create(sockfd, 0, 0);
+	if (transp == NULL) {
+		fprintf (stderr, "%s", "cannot create tcp service");
+		exit(1);
+	}
+
+	if (!svc_register(transp, GLUSTER_BLOCK, GLUSTER_BLOCK_VERS, gluster_block_1, IPPROTO_TCP)) {
+		fprintf (stderr, "%s", "unable to register (BLOCK_PROG, GLUSTER_BLOCK_VERS, tcp).");
+		exit(1);
+	}
+
+	svc_run ();
+
+	fprintf (stderr, "%s", "svc_run returned");
+	exit (1);
+	/* NOTREACHED */
+}
diff --git a/rpc/block_xdr.c b/rpc/block_xdr.c
new file mode 100644
index 0000000..cd8400e
--- /dev/null
+++ b/rpc/block_xdr.c
@@ -0,0 +1,16 @@
+/*
+ * Please do not edit this file.
+ * It was generated using rpcgen.
+ */
+
+#include "block.h"
+
+bool_t
+xdr_blockTrans (XDR *xdrs, blockTrans *objp)
+{
+	 if (!xdr_int (xdrs, &objp->exit))
+		 return FALSE;
+	 if (!xdr_string (xdrs, &objp->out, ~0))
+		 return FALSE;
+	return TRUE;
+}