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/*
* iscsid communication helpers
*
* Copyright (C) 2004 Dmitry Yusupov, Alex Aizman
* Copyright (C) 2006 - 2010 Mike Christie
* Copyright (C) 2006 - 2010 Red Hat, Inc. All rights reserved.
* maintained by open-iscsi@googlegroups.com
*
* 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.
*
* See the file COPYING included with this distribution for more details.
*/
#include <unistd.h>
#include <stdlib.h>
#include <string.h>
#include <errno.h>
#include <sys/un.h>
#include <sys/types.h>
#include <sys/socket.h>
#include "initiator.h"
#include "log.h"
#include "mgmt_ipc.h"
#include "iscsi_util.h"
#include "config.h"
static void iscsid_startup(void)
{
char *startup_cmd;
startup_cmd = cfg_get_string_param(CONFIG_FILE, "iscsid.startup");
if (!startup_cmd) {
log_error("iscsid is not running. Could not start it up "
"automatically using the startup command in the "
"/etc/iscsi/iscsid.conf iscsid.startup setting. "
"Please check that the file exists or that your "
"init scripts have started iscsid.");
return;
}
system(startup_cmd);
}
#define MAXSLEEP 128
static mgmt_ipc_err_e iscsid_connect(int *fd, int start_iscsid)
{
int nsec;
struct sockaddr_un addr;
*fd = socket(AF_LOCAL, SOCK_STREAM, 0);
if (*fd < 0) {
log_error("can not create IPC socket (%d)!", errno);
return MGMT_IPC_ERR_ISCSID_NOTCONN;
}
memset(&addr, 0, sizeof(addr));
addr.sun_family = AF_LOCAL;
memcpy((char *) &addr.sun_path + 1, ISCSIADM_NAMESPACE,
strlen(ISCSIADM_NAMESPACE));
/*
* Trying to connect with exponential backoff
*/
for (nsec = 1; nsec <= MAXSLEEP; nsec <<= 1) {
if (connect(*fd, (struct sockaddr *) &addr, sizeof(addr)) == 0)
/* Connection established */
return MGMT_IPC_OK;
/* If iscsid isn't there, there's no sense
* in retrying. */
if (errno == ECONNREFUSED) {
if (start_iscsid && nsec == 1)
iscsid_startup();
else
break;
}
/*
* Delay before trying again
*/
if (nsec <= MAXSLEEP/2)
sleep(nsec);
}
log_error("can not connect to iSCSI daemon (%d)!", errno);
return MGMT_IPC_ERR_ISCSID_NOTCONN;
}
mgmt_ipc_err_e iscsid_request(int *fd, iscsiadm_req_t *req, int start_iscsid)
{
int err;
err = iscsid_connect(fd, start_iscsid);
if (err)
return err;
if ((err = write(*fd, req, sizeof(*req))) != sizeof(*req)) {
log_error("got write error (%d/%d) on cmd %d, daemon died?",
err, errno, req->command);
close(*fd);
return MGMT_IPC_ERR_ISCSID_COMM_ERR;
}
return MGMT_IPC_OK;
}
mgmt_ipc_err_e iscsid_response(int fd, iscsiadm_cmd_e cmd, iscsiadm_rsp_t *rsp)
{
mgmt_ipc_err_e iscsi_err;
int err;
if ((err = recv(fd, rsp, sizeof(*rsp), MSG_WAITALL)) != sizeof(*rsp)) {
log_error("got read error (%d/%d), daemon died?", err, errno);
iscsi_err = MGMT_IPC_ERR_ISCSID_COMM_ERR;
} else
iscsi_err = rsp->err;
close(fd);
if (!iscsi_err && cmd != rsp->command)
iscsi_err = MGMT_IPC_ERR_ISCSID_COMM_ERR;
return iscsi_err;
}
mgmt_ipc_err_e iscsid_exec_req(iscsiadm_req_t *req, iscsiadm_rsp_t *rsp,
int start_iscsid)
{
int fd;
mgmt_ipc_err_e err;
err = iscsid_request(&fd, req, start_iscsid);
if (err)
return err;
return iscsid_response(fd, req->command, rsp);
}
int iscsid_req_wait(iscsiadm_cmd_e cmd, int fd)
{
iscsiadm_rsp_t rsp;
memset(&rsp, 0, sizeof(iscsiadm_rsp_t));
return iscsid_response(fd, cmd, &rsp);
}
int iscsid_req_by_rec_async(iscsiadm_cmd_e cmd, node_rec_t *rec, int *fd)
{
iscsiadm_req_t req;
memset(&req, 0, sizeof(iscsiadm_req_t));
req.command = cmd;
memcpy(&req.u.session.rec, rec, sizeof(node_rec_t));
return iscsid_request(fd, &req, 1);
}
int iscsid_req_by_rec(iscsiadm_cmd_e cmd, node_rec_t *rec)
{
int err, fd;
err = iscsid_req_by_rec_async(cmd, rec, &fd);
if (err)
return err;
return iscsid_req_wait(cmd, fd);
}
int iscsid_req_by_sid_async(iscsiadm_cmd_e cmd, int sid, int *fd)
{
iscsiadm_req_t req;
memset(&req, 0, sizeof(iscsiadm_req_t));
req.command = cmd;
req.u.session.sid = sid;
return iscsid_request(fd, &req, 1);
}
int iscsid_req_by_sid(iscsiadm_cmd_e cmd, int sid)
{
int err, fd;
err = iscsid_req_by_sid_async(cmd, sid, &fd);
if (err)
return err;
return iscsid_req_wait(cmd, fd);
}
void iscsid_handle_error(mgmt_ipc_err_e err)
{
static char *err_msgs[] = {
/* 0 */ "",
/* 1 */ "unknown error",
/* 2 */ "not found",
/* 3 */ "no available memory",
/* 4 */ "encountered connection failure",
/* 5 */ "encountered iSCSI login failure",
/* 6 */ "encountered iSCSI database failure",
/* 7 */ "invalid parameter",
/* 8 */ "connection timed out",
/* 9 */ "internal error",
/* 10 */ "encountered iSCSI logout failure",
/* 11 */ "iSCSI PDU timed out",
/* 12 */ "iSCSI driver not found. Please make sure it is loaded, and retry the operation",
/* 13 */ "daemon access denied",
/* 14 */ "iSCSI driver does not support requested capability.",
/* 15 */ "already exists",
/* 16 */ "Unknown request",
/* 17 */ "encountered iSNS failure",
/* 18 */ "could not communicate to iscsid",
/* 19 */ "encountered non-retryable iSCSI login failure",
/* 20 */ "could not connect to iscsid",
};
log_error("initiator reported error (%d - %s)", err, err_msgs[err]);
}
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