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/*
* Copyright (C) 2011-2012 Red Hat, Inc.
*
* This file is part of LVM2.
*
* This copyrighted material is made available to anyone wishing to use,
* modify, copy, or redistribute it subject to the terms and conditions
* of the GNU Lesser General Public License v.2.1.
*
* You should have received a copy of the GNU Lesser 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 "daemon-shared.h"
#include "daemon-client.h"
#include <sys/un.h>
#include <sys/socket.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include <assert.h>
#include <errno.h> // ENOMEM
daemon_handle daemon_open(daemon_info i) {
daemon_handle h = { .protocol_version = 0, .error = 0 };
daemon_reply r = { .cft = NULL };
struct sockaddr_un sockaddr;
if ((h.socket_fd = socket(PF_UNIX, SOCK_STREAM /* | SOCK_NONBLOCK */, 0)) < 0)
goto error;
memset(&sockaddr, 0, sizeof(sockaddr));
strcpy(sockaddr.sun_path, i.socket);
sockaddr.sun_family = AF_UNIX;
if (connect(h.socket_fd,(struct sockaddr *) &sockaddr, sizeof(sockaddr)))
goto error;
r = daemon_send_simple(h, "hello", NULL);
if (r.error || strcmp(daemon_reply_str(r, "response", "unknown"), "OK"))
goto error;
h.protocol = daemon_reply_str(r, "protocol", NULL);
if (h.protocol)
h.protocol = dm_strdup(h.protocol); /* keep around */
h.protocol_version = daemon_reply_int(r, "version", 0);
if (i.protocol && (!h.protocol || strcmp(h.protocol, i.protocol)))
goto error;
if (i.protocol_version && h.protocol_version != i.protocol_version)
goto error;
daemon_reply_destroy(r);
return h;
error:
h.error = errno;
if (h.socket_fd >= 0)
if (close(h.socket_fd))
perror("close");
if (r.cft)
daemon_reply_destroy(r);
h.socket_fd = -1;
return h;
}
daemon_reply daemon_send(daemon_handle h, daemon_request rq)
{
daemon_reply reply = { .cft = NULL, .error = 0 };
assert(h.socket_fd >= 0);
if (!rq.buffer) {
/* TODO: build the buffer from rq.cft */
}
assert(rq.buffer);
if (!write_buffer(h.socket_fd, rq.buffer, strlen(rq.buffer)))
reply.error = errno;
if (read_buffer(h.socket_fd, &reply.buffer)) {
reply.cft = dm_config_from_string(reply.buffer);
} else
reply.error = errno;
return reply;
}
void daemon_reply_destroy(daemon_reply r) {
if (r.cft)
dm_config_destroy(r.cft);
dm_free(r.buffer);
}
daemon_reply daemon_send_simple(daemon_handle h, const char *id, ...)
{
static const daemon_reply err = { .error = ENOMEM, .buffer = NULL, .cft = NULL };
daemon_request rq = { .cft = NULL };
daemon_reply repl;
va_list ap;
va_start(ap, id);
rq.buffer = format_buffer("request", id, ap);
va_end(ap);
if (!rq.buffer)
return err;
repl = daemon_send(h, rq);
dm_free(rq.buffer);
return repl;
}
void daemon_close(daemon_handle h)
{
dm_free((char *)h.protocol);
}
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