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/*
* This file is part of the Distributed Network Block Device 3
*
* Copyright(c) 2011-2012 Johann Latocha <johann@latocha.de>
*
* This file may be licensed under the terms of of the
* GNU General Public License Version 2 (the ``GPL'').
*
* Software distributed under the License is distributed
* on an ``AS IS'' basis, WITHOUT WARRANTY OF ANY KIND, either
* express or implied. See the GPL for the specific language
* governing rights and limitations.
*
* You should have received a copy of the GPL along with this
* program. If not, go to http://www.gnu.org/licenses/gpl.html
* or write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
*/
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/un.h>
#include <stdio.h>
#include <sys/stat.h>
#include <grp.h>
#include <stdlib.h>
#include <unistd.h>
#include <pthread.h>
#include <netinet/in.h>
#include <libxml/parser.h>
#include <libxml/xpath.h>
#include "ipc.h"
#include "config.h"
#include "server.h"
#include "utils.h"
void* dnbd3_ipc_receive()
{
int server_sock, client_sock;
struct sockaddr_un server, client;
unsigned int len = sizeof(client);
GSList *iterator = NULL;
struct tm * timeinfo;
char time_buff[64];
// Create socket
if ((server_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
perror("ERROR: IPC socket");
exit(EXIT_FAILURE);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, UNIX_SOCKET);
unlink(UNIX_SOCKET);
// Bind to socket
if (bind(server_sock, &server, sizeof(server.sun_family) + strlen(server.sun_path)) < 0)
{
perror("ERROR: IPC bind");
exit(EXIT_FAILURE);
}
// Listen on socket
if (listen(server_sock, 5) < 0)
{
perror("ERROR: IPC listen");
exit(EXIT_FAILURE);
}
// Set groupID and permissions on ipc socket
struct group *grp;
grp = getgrnam(UNIX_SOCKET_GROUP);
if (grp == NULL)
{
printf("WARN: Group '%s' not found.\n", UNIX_SOCKET_GROUP);
}
else
{
chmod(UNIX_SOCKET, 0775);
chown(UNIX_SOCKET, -1, grp->gr_gid);
}
while (1)
{
int i = 0;
uint32_t cmd;
// Accept connection
if ((client_sock = accept(server_sock, &client, &len)) < 0)
{
perror("ERROR: IPC accept");
exit(EXIT_FAILURE);
}
recv(client_sock, &cmd, sizeof(cmd), MSG_WAITALL);
switch (ntohl(cmd))
{
case IPC_EXIT:
printf("INFO: Server shutdown...\n");
close(client_sock);
close(server_sock);
dnbd3_cleanup();
break;
case IPC_RELOAD:
printf("INFO: Reloading configuration...\n");
dnbd3_reload_config(_config_file_name);
close(client_sock);
break;
case IPC_INFO:
pthread_spin_lock(&_spinlock);
xmlDocPtr doc;
xmlNodePtr root_node, images_node, clients_node, tmp_node;
xmlChar *xmlbuff;
int buffersize;
doc = xmlNewDoc(BAD_CAST "1.0");
root_node = xmlNewNode(NULL, BAD_CAST "dnbd3-server");
xmlDocSetRootElement(doc, root_node);
// Images
images_node = xmlNewNode(NULL, BAD_CAST "images");
xmlAddChild(root_node, images_node);
for (i = 0; i < _num_images; i++)
{
char vid[20], rid[20];
sprintf(vid,"%d",_images[i].vid);
sprintf(rid,"%d",_images[i].rid);
timeinfo = localtime(&_images[i].atime);
strftime(time_buff,64,"%d.%m.%y %H:%M:%S",timeinfo);
tmp_node = xmlNewNode(NULL, BAD_CAST "image");
xmlNewProp(tmp_node, BAD_CAST "atime", BAD_CAST time_buff);
xmlNewProp(tmp_node, BAD_CAST "vid", BAD_CAST vid);
xmlNewProp(tmp_node, BAD_CAST "rid", BAD_CAST rid);
xmlNewProp(tmp_node, BAD_CAST "file", BAD_CAST _images[i].file);
xmlAddChild(images_node, tmp_node);
}
// Clients
clients_node = xmlNewNode(NULL, BAD_CAST "clients");
xmlAddChild(root_node, clients_node);
for (iterator = _dnbd3_clients; iterator; iterator = iterator->next)
{
dnbd3_client_t *client = iterator->data;
if (client->image)
{
tmp_node = xmlNewNode(NULL, BAD_CAST "client");
xmlNewProp(tmp_node, BAD_CAST "ip", BAD_CAST client->ip);
xmlNewProp(tmp_node, BAD_CAST "file", BAD_CAST client->image->file);
xmlAddChild(clients_node, tmp_node);
}
}
// Dump and send
xmlDocDumpFormatMemory(doc, &xmlbuff, &buffersize, 1);
send(client_sock, (char *) xmlbuff, buffersize, MSG_WAITALL);
// Cleanup
pthread_spin_unlock(&_spinlock);
close(client_sock);
xmlFree(xmlbuff);
xmlFreeDoc(doc);
break;
default:
printf("ERROR: Unknown command: %i\n", cmd);
close(client_sock);
break;
}
}
close(server_sock);
}
void dnbd3_ipc_send(int cmd)
{
int client_sock, size;
struct sockaddr_un server;
uint32_t cmd_net = htonl(cmd);
char buf[64];
xmlParserCtxtPtr ctxt;
xmlDocPtr doc;
// Create socket
if ((client_sock = socket(AF_UNIX, SOCK_STREAM, 0)) < 0)
{
perror("ERROR: IPC socket");
exit(EXIT_FAILURE);
}
server.sun_family = AF_UNIX;
strcpy(server.sun_path, UNIX_SOCKET);
// Connect to server
if (connect(client_sock, &server, sizeof(server.sun_family) + strlen(server.sun_path)) < 0)
{
perror("ERROR: IPC connect");
exit(EXIT_FAILURE);
}
// Send message
send(client_sock, &cmd_net, sizeof(cmd_net), MSG_WAITALL);
if (cmd == IPC_INFO)
{
// Parse reply
ctxt = xmlCreatePushParserCtxt(NULL, NULL, NULL, 0, NULL);
while ( (size=recv(client_sock, &buf, sizeof(buf), MSG_WAITALL)) > 0)
xmlParseChunk(ctxt, buf, size, 0);
// Indicate the parsing is finished
xmlParseChunk(ctxt, buf, 0, 1);
doc = ctxt->myDoc;
// Print reply to stdout
if (ctxt->wellFormed)
{
int n, i;
xmlXPathContextPtr xpathCtx;
xmlXPathObjectPtr xpathObj;
xmlChar* xpathExpr;
xmlNodeSetPtr nodes;
xmlNodePtr cur;
// Print images
xpathExpr = BAD_CAST "/dnbd3-server/images/image";
xpathCtx = xmlXPathNewContext(doc);
xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
printf("Exported images (atime, vid, rid, file):\n");
printf("========================================\n");
nodes = xpathObj->nodesetval;
n = (nodes) ? nodes->nodeNr : 0;
for(i = 0; i < n; ++i)
{
if(nodes->nodeTab[i]->type == XML_ELEMENT_NODE)
{
cur = nodes->nodeTab[i];
xmlChar *atime = xmlGetNoNsProp(cur, BAD_CAST "atime");
xmlChar *vid = xmlGetNoNsProp(cur, BAD_CAST "vid");
xmlChar *rid = xmlGetNoNsProp(cur, BAD_CAST "rid");
xmlChar *file = xmlGetNoNsProp(cur, BAD_CAST "file");
printf("%s\t%s\t%s\t%s\n", atime, vid, rid, file);
}
}
printf("\nNumber images: %d\n\n", n);
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
// Print clients
xpathExpr = BAD_CAST "/dnbd3-server/clients/client";
xpathCtx = xmlXPathNewContext(doc);
xpathObj = xmlXPathEvalExpression(xpathExpr, xpathCtx);
printf("Connected clients (ip, file):\n");
printf("=============================\n");
nodes = xpathObj->nodesetval;
n = (nodes) ? nodes->nodeNr : 0;
for(i = 0; i < n; ++i)
{
if(nodes->nodeTab[i]->type == XML_ELEMENT_NODE)
{
cur = nodes->nodeTab[i];
xmlChar *ip = xmlGetNoNsProp(cur, BAD_CAST "ip");
xmlChar *file = xmlGetNoNsProp(cur, BAD_CAST "file");
printf("%s\t%s\n", ip, file);
}
}
printf("\nNumber clients: %d\n\n", n);
xmlXPathFreeObject(xpathObj);
xmlXPathFreeContext(xpathCtx);
//xmlDocDump(stdout, doc);
}
else
{
printf("ERROR: Failed to parse reply\n");
}
// Cleanup
xmlFreeParserCtxt(ctxt);
xmlFreeDoc(doc);
xmlCleanupParser();
}
close(client_sock);
}
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