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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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#define _REENTRANT
#include "tool.h"
#include "daemon-io.h"
#include "daemon-client.h"
#include "dm-logging.h"
#include <sys/un.h>
#include <sys/socket.h>
daemon_handle daemon_open(daemon_info i)
{
daemon_handle h = { .error = 0 };
daemon_reply r = { 0 };
struct sockaddr_un sockaddr = { .sun_family = AF_UNIX };
log_debug("%s: Opening daemon socket to %s for protocol %s version %d.",
i.socket, i.path, i.protocol, i.protocol_version);
if ((h.socket_fd = socket(PF_UNIX, SOCK_STREAM /* | SOCK_NONBLOCK */, 0)) < 0) {
h.error = errno;
log_sys_error("socket", i.socket);
goto error;
}
if (!dm_strncpy(sockaddr.sun_path, i.socket, sizeof(sockaddr.sun_path))) {
log_error("%s: Daemon socket path too long.", i.socket);
goto error;
}
if (connect(h.socket_fd,(struct sockaddr *) &sockaddr, sizeof(sockaddr))) {
h.error = errno;
log_sys_error("connect", i.socket);
goto error;
}
log_debug("Sending daemon %s: hello", i.path);
r = daemon_send_simple(h, "hello", NULL);
if (r.error || strcmp(daemon_reply_str(r, "response", "unknown"), "OK")) {
h.error = r.error;
log_error("Daemon %s returned error %d", i.path, r.error);
goto error;
}
/* Check protocol and version matches */
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))) {
log_error("Daemon %s: requested protocol %s != %s",
i.path, i.protocol, h.protocol ? : "");
goto error;
}
if (i.protocol_version && h.protocol_version != i.protocol_version) {
log_error("Daemon %s: requested protocol version %d != %d",
i.path, i.protocol_version, h.protocol_version);
goto error;
}
daemon_reply_destroy(r);
return h;
error:
if (h.socket_fd >= 0 && close(h.socket_fd))
log_sys_error("close", "daemon_open");
h.socket_fd = -1;
if (r.cft)
daemon_reply_destroy(r);
dm_free((char *)h.protocol);
h.protocol = NULL;
return h;
}
daemon_reply daemon_send(daemon_handle h, daemon_request rq)
{
struct buffer buffer;
daemon_reply reply = { 0 };
if (h.socket_fd < 0) {
log_error(INTERNAL_ERROR "Daemon send: socket fd cannot be negative %d", h.socket_fd);
reply.error = EINVAL;
return reply;
}
buffer = rq.buffer;
if (!buffer.mem)
if (!dm_config_write_node(rq.cft->root, buffer_line, &buffer)) {
reply.error = ENOMEM;
return reply;
}
if (!buffer.mem) {
log_error(INTERNAL_ERROR "Daemon send: no memory available");
reply.error = ENOMEM;
return reply;
}
if (!buffer_write(h.socket_fd, &buffer))
reply.error = errno;
if (buffer_read(h.socket_fd, &reply.buffer)) {
reply.cft = config_tree_from_string_without_dup_node_check(reply.buffer.mem);
if (!reply.cft)
reply.error = EPROTO;
} else
reply.error = errno;
if (buffer.mem != rq.buffer.mem)
buffer_destroy(&buffer);
return reply;
}
void daemon_reply_destroy(daemon_reply r)
{
if (r.cft)
dm_config_destroy(r.cft);
buffer_destroy(&r.buffer);
}
daemon_reply daemon_send_simple_v(daemon_handle h, const char *id, va_list ap)
{
static const daemon_reply err = { .error = ENOMEM };
daemon_request rq = { .cft = NULL };
daemon_reply repl;
va_list apc;
va_copy(apc, ap);
if (!buffer_append_f(&rq.buffer, "request = %s", id, NULL) ||
!buffer_append_vf(&rq.buffer, apc)) {
va_end(apc);
buffer_destroy(&rq.buffer);
return err;
}
va_end(apc);
repl = daemon_send(h, rq);
buffer_destroy(&rq.buffer);
return repl;
}
daemon_reply daemon_send_simple(daemon_handle h, const char *id, ...)
{
daemon_reply r;
va_list ap;
va_start(ap, id);
r = daemon_send_simple_v(h, id, ap);
va_end(ap);
return r;
}
void daemon_close(daemon_handle h)
{
if (h.socket_fd >= 0) {
log_debug("Closing daemon socket (fd %d).", h.socket_fd);
if (close(h.socket_fd))
log_sys_error("close", "daemon_close");
}
dm_free((char *)h.protocol);
}
daemon_request daemon_request_make(const char *id)
{
daemon_request r;
buffer_init(&r.buffer);
if (!(r.cft = dm_config_create()))
goto_bad;
if (!(r.cft->root = make_text_node(r.cft, "request", id, NULL, NULL)))
goto_bad;
return r;
bad:
if (r.cft) {
dm_config_destroy(r.cft);
r.cft = NULL;
}
return r;
}
int daemon_request_extend_v(daemon_request r, va_list ap)
{
int res;
va_list apc;
if (!r.cft)
return 0;
va_copy(apc, ap);
res = config_make_nodes_v(r.cft, NULL, r.cft->root, apc) ? 1 : 0;
va_end(apc);
return res;
}
int daemon_request_extend(daemon_request r, ...)
{
int res;
va_list ap;
va_start(ap, r);
res = daemon_request_extend_v(r, ap);
va_end(ap);
return res;
}
void daemon_request_destroy(daemon_request r)
{
if (r.cft)
dm_config_destroy(r.cft);
buffer_destroy(&r.buffer);
}
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