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/* cvm/client_xfer_udp.c - CVM client UDP transmission library
* Copyright (C) 2010 Bruce Guenter <bruce@untroubled.org>
*
* 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 2 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <sys/types.h>
#include <netdb.h>
#include <signal.h>
#include <stdlib.h>
#include <string.h>
#include <sys/wait.h>
#include <unistd.h>
#include <sysdeps.h>
#include <net/socket.h>
#include "v1client.h"
#include "protocol.h"
/* UDP module invocation *****************************************************/
static int udp_sendrecv(int sock, ipv4addr* ip, ipv4port port,
const struct cvm_packet* request,
struct cvm_packet* response)
{
int timeout;
int try;
iopoll_fd ifd;
ifd.fd = sock;
ifd.events = IOPOLL_READ;
for (timeout = 2, try = 0; try < 4; timeout *= 2, ++try) {
if ((unsigned)socket_send4(sock, (char*)request->data, request->length,
ip, port) != request->length)
return 0;
if (iopoll(&ifd, 1, timeout*1000) != 0)
return (response->length = socket_recv4(sock, (char*)response->data,
CVM_BUFSIZE, ip,
&port)) != (unsigned)-1;
}
return 0;
}
unsigned cvm_xfer_udp_packets(const char* hostport,
const struct cvm_packet* request,
struct cvm_packet* response)
{
static char* hostname;
char* portstr;
ipv4port port;
int sock;
struct hostent* he;
ipv4addr ip;
if ((portstr = strchr(hostport, ':')) == 0) return CVME_GENERAL;
if (hostname) free(hostname);
hostname = malloc(portstr-hostport+1);
memcpy(hostname, hostport, portstr-hostport);
hostname[portstr-hostport] = 0;
port = strtoul(portstr+1, &portstr, 10);
if (*portstr != 0) return CVME_GENERAL;
if ((he = gethostbyname(hostname)) == 0) return CVME_GENERAL;
memcpy(&ip, he->h_addr_list[0], 4);
if ((sock = socket_udp()) == -1) return CVME_IO;
if (!udp_sendrecv(sock, &ip, port, request, response)) {
close(sock);
return CVME_IO;
}
close(sock);
return 0;
}
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