freebsd-dev/sbin/iscontrol/fsm.c

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/*-
* Copyright (c) 2005-2010 Daniel Braniss <danny@cs.huji.ac.il>
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*
*/
/*
| $Id: fsm.c,v 2.8 2007/05/19 16:34:21 danny Exp danny $
*/
#include <sys/cdefs.h>
__FBSDID("$FreeBSD$");
#include <sys/param.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/sysctl.h>
#include <netinet/in.h>
#include <netinet/tcp.h>
#include <arpa/inet.h>
#include <sys/ioctl.h>
#include <netdb.h>
#include <stdlib.h>
#include <unistd.h>
#include <stdio.h>
#include <string.h>
#include <errno.h>
#include <fcntl.h>
#include <time.h>
#include <syslog.h>
#include <stdarg.h>
#include <camlib.h>
#include <dev/iscsi_initiator/iscsi.h>
#include "iscontrol.h"
typedef enum {
T1 = 1,
T2, /*T3,*/ T4, T5, /*T6,*/ T7, T8, T9,
T10, T11, T12, T13, T14, T15, T16, T18
} trans_t;
/*
| now supports IPV6
| thanks to:
| Hajimu UMEMOTO @ Internet Mutual Aid Society Yokohama, Japan
| ume@mahoroba.org ume@{,jp.}FreeBSD.org
| http://www.imasy.org/~ume/
*/
static trans_t
tcpConnect(isess_t *sess)
{
isc_opt_t *op = sess->op;
int val, sv_errno, soc;
struct addrinfo *res, *res0, hints;
char pbuf[10];
debug_called(3);
if(sess->flags & (SESS_RECONNECT|SESS_REDIRECT)) {
syslog(LOG_INFO, "%s", (sess->flags & SESS_RECONNECT)
? "Reconnect": "Redirected");
debug(1, "%s", (sess->flags & SESS_RECONNECT) ? "Reconnect": "Redirected");
shutdown(sess->soc, SHUT_RDWR);
//close(sess->soc);
sess->soc = -1;
sess->flags &= ~SESS_CONNECTED;
if(sess->flags & SESS_REDIRECT) {
sess->redirect_cnt++;
sess->flags |= SESS_RECONNECT;
} else
sleep(2); // XXX: actually should be ?
#ifdef notyet
{
time_t sec;
// make sure we are not in a loop
// XXX: this code has to be tested
sec = time(0) - sess->reconnect_time;
if(sec > (5*60)) {
// if we've been connected for more that 5 minutes
// then just reconnect
sess->reconnect_time = sec;
sess->reconnect_cnt1 = 0;
}
else {
//
sess->reconnect_cnt1++;
if((sec / sess->reconnect_cnt1) < 2) {
// if less that 2 seconds from the last reconnect
// we are most probably looping
syslog(LOG_CRIT, "too many reconnects %d", sess->reconnect_cnt1);
return 0;
}
}
}
#endif
sess->reconnect_cnt++;
}
snprintf(pbuf, sizeof(pbuf), "%d", op->port);
memset(&hints, 0, sizeof(hints));
hints.ai_family = PF_UNSPEC;
hints.ai_socktype = SOCK_STREAM;
debug(1, "targetAddress=%s port=%d", op->targetAddress, op->port);
if((val = getaddrinfo(op->targetAddress, pbuf, &hints, &res0)) != 0) {
fprintf(stderr, "getaddrinfo(%s): %s\n", op->targetAddress, gai_strerror(val));
return 0;
}
sess->flags &= ~SESS_CONNECTED;
sv_errno = 0;
soc = -1;
for(res = res0; res; res = res->ai_next) {
soc = socket(res->ai_family, res->ai_socktype, res->ai_protocol);
if (soc == -1)
continue;
// from Patrick.Guelat@imp.ch:
// iscontrol can be called without waiting for the socket entry to time out
val = 1;
if(setsockopt(soc, SOL_SOCKET, SO_REUSEADDR, &val, (socklen_t)sizeof(val)) < 0) {
fprintf(stderr, "Cannot set socket SO_REUSEADDR %d: %s\n\n",
errno, strerror(errno));
}
if(connect(soc, res->ai_addr, res->ai_addrlen) == 0)
break;
sv_errno = errno;
close(soc);
soc = -1;
}
freeaddrinfo(res0);
if(soc != -1) {
sess->soc = soc;
#if 0
struct timeval timeout;
val = 1;
if(setsockopt(sess->soc, IPPROTO_TCP, TCP_KEEPALIVE, &val, sizeof(val)) < 0)
fprintf(stderr, "Cannot set socket KEEPALIVE option err=%d %s\n",
errno, strerror(errno));
if(setsockopt(sess->soc, IPPROTO_TCP, TCP_NODELAY, &val, sizeof(val)) < 0)
fprintf(stderr, "Cannot set socket NO delay option err=%d %s\n",
errno, strerror(errno));
timeout.tv_sec = 10;
timeout.tv_usec = 0;
if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDTIMEO, &timeout, sizeof(timeout)) < 0)
|| (setsockopt(sess->soc, SOL_SOCKET, SO_RCVTIMEO, &timeout, sizeof(timeout)) < 0)) {
fprintf(stderr, "Cannot set socket timeout to %ld err=%d %s\n",
timeout.tv_sec, errno, strerror(errno));
}
#endif
#ifdef CURIOUS
{
int len = sizeof(val);
if(getsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, &len) == 0)
fprintf(stderr, "was: SO_SNDBUF=%dK\n", val/1024);
}
#endif
if(sess->op->sockbufsize) {
val = sess->op->sockbufsize * 1024;
if((setsockopt(sess->soc, SOL_SOCKET, SO_SNDBUF, &val, sizeof(val)) < 0)
|| (setsockopt(sess->soc, SOL_SOCKET, SO_RCVBUF, &val, sizeof(val)) < 0)) {
fprintf(stderr, "Cannot set socket sndbuf & rcvbuf to %d err=%d %s\n",
val, errno, strerror(errno));
return 0;
}
}
sess->flags |= SESS_CONNECTED;
return T1;
}
fprintf(stderr, "errno=%d\n", sv_errno);
perror("connect");
switch(sv_errno) {
case ECONNREFUSED:
case EHOSTUNREACH:
case ENETUNREACH:
case ETIMEDOUT:
if((sess->flags & SESS_REDIRECT) == 0) {
if(strcmp(op->targetAddress, sess->target.address) != 0) {
syslog(LOG_INFO, "reconnecting to original target address");
free(op->targetAddress);
op->targetAddress = sess->target.address;
op->port = sess->target.port;
op->targetPortalGroupTag = sess->target.pgt;
return T1;
}
}
sleep(5); // for now ...
return T1;
default:
return 0; // terminal error
}
}
int
setOptions(isess_t *sess, int flag)
{
isc_opt_t oop;
char *sep;
debug_called(3);
bzero(&oop, sizeof(isc_opt_t));
if((flag & SESS_FULLFEATURE) == 0) {
oop.initiatorName = sess->op->initiatorName;
oop.targetAddress = sess->op->targetAddress;
if(sess->op->targetName != 0)
oop.targetName = sess->op->targetName;
oop.maxRecvDataSegmentLength = sess->op->maxRecvDataSegmentLength;
oop.maxXmitDataSegmentLength = sess->op->maxXmitDataSegmentLength; // XXX:
oop.maxBurstLength = sess->op->maxBurstLength;
oop.maxluns = sess->op->maxluns;
}
else {
/*
| turn on digestion only after login
*/
if(sess->op->headerDigest != NULL) {
sep = strchr(sess->op->headerDigest, ',');
if(sep == NULL)
oop.headerDigest = sess->op->headerDigest;
debug(1, "oop.headerDigest=%s", oop.headerDigest);
}
if(sess->op->dataDigest != NULL) {
sep = strchr(sess->op->dataDigest, ',');
if(sep == NULL)
oop.dataDigest = sess->op->dataDigest;
debug(1, "oop.dataDigest=%s", oop.dataDigest);
}
}
if(ioctl(sess->fd, ISCSISETOPT, &oop)) {
perror("ISCSISETOPT");
return -1;
}
return 0;
}
static trans_t
startSession(isess_t *sess)
{
int n, fd, nfd;
char *dev;
debug_called(3);
if((sess->flags & SESS_CONNECTED) == 0) {
return T2;
}
if(sess->fd == -1) {
fd = open(iscsidev, O_RDWR);
if(fd < 0) {
perror(iscsidev);
return 0;
}
{
// XXX: this has to go
size_t n;
n = sizeof(sess->isid);
if(sysctlbyname("net.iscsi_initiator.isid", (void *)sess->isid, (size_t *)&n, 0, 0) != 0)
perror("sysctlbyname");
}
if(ioctl(fd, ISCSISETSES, &n)) {
perror("ISCSISETSES");
return 0;
}
asprintf(&dev, "%s%d", iscsidev, n);
nfd = open(dev, O_RDWR);
if(nfd < 0) {
perror(dev);
free(dev);
return 0;
}
free(dev);
close(fd);
sess->fd = nfd;
if(setOptions(sess, 0) != 0)
return -1;
}
if(ioctl(sess->fd, ISCSISETSOC, &sess->soc)) {
perror("ISCSISETSOC");
return 0;
}
return T4;
}
isess_t *currsess;
static void
trap(int sig)
{
syslog(LOG_NOTICE, "trapped signal %d", sig);
fprintf(stderr, "trapped signal %d\n", sig);
switch(sig) {
case SIGHUP:
currsess->flags |= SESS_DISCONNECT;
break;
case SIGUSR1:
currsess->flags |= SESS_RECONNECT;
break;
case SIGINT:
case SIGTERM:
default:
return; // ignore
}
}
static int
doCAM(isess_t *sess)
{
char pathstr[1024];
union ccb *ccb;
int i, n;
if(ioctl(sess->fd, ISCSIGETCAM, &sess->cam) != 0) {
syslog(LOG_WARNING, "ISCSIGETCAM failed: %d", errno);
return 0;
}
debug(1, "nluns=%d", sess->cam.target_nluns);
/*
| for now will do this for each lun ...
*/
for(n = i = 0; i < sess->cam.target_nluns; i++) {
debug(2, "CAM path_id=%d target_id=%d",
sess->cam.path_id, sess->cam.target_id);
sess->camdev = cam_open_btl(sess->cam.path_id, sess->cam.target_id,
i, O_RDWR, NULL);
if(sess->camdev == NULL) {
//syslog(LOG_WARNING, "%s", cam_errbuf);
debug(3, "%s", cam_errbuf);
continue;
}
cam_path_string(sess->camdev, pathstr, sizeof(pathstr));
debug(2, "pathstr=%s", pathstr);
ccb = cam_getccb(sess->camdev);
bzero(&(&ccb->ccb_h)[1], sizeof(struct ccb_relsim) - sizeof(struct ccb_hdr));
ccb->ccb_h.func_code = XPT_REL_SIMQ;
ccb->crs.release_flags = RELSIM_ADJUST_OPENINGS;
ccb->crs.openings = sess->op->tags;
if(cam_send_ccb(sess->camdev, ccb) < 0)
debug(2, "%s", cam_errbuf);
else
if((ccb->ccb_h.status & CAM_STATUS_MASK) != CAM_REQ_CMP) {
syslog(LOG_WARNING, "XPT_REL_SIMQ CCB failed");
// cam_error_print(sess->camdev, ccb, CAM_ESF_ALL, CAM_EPF_ALL, stderr);
}
else {
n++;
syslog(LOG_INFO, "%s tagged openings now %d\n", pathstr, ccb->crs.openings);
}
cam_freeccb(ccb);
cam_close_device(sess->camdev);
}
return n;
}
static trans_t
supervise(isess_t *sess)
{
int sig, val;
debug_called(3);
if(strcmp(sess->op->sessionType, "Discovery") == 0) {
sess->flags |= SESS_DISCONNECT;
return T9;
}
if(vflag)
printf("ready to go scsi\n");
if(setOptions(sess, SESS_FULLFEATURE) != 0)
return 0; // failure
if((sess->flags & SESS_FULLFEATURE) == 0) {
if(daemon(0, 1) != 0) {
perror("daemon");
exit(1);
}
if(sess->op->pidfile != NULL) {
FILE *pidf;
pidf = fopen(sess->op->pidfile, "w");
if(pidf != NULL) {
fprintf(pidf, "%d\n", getpid());
fclose(pidf);
}
}
openlog("iscontrol", LOG_CONS|LOG_PERROR|LOG_PID|LOG_NDELAY, LOG_KERN);
syslog(LOG_INFO, "running");
currsess = sess;
if(ioctl(sess->fd, ISCSISTART)) {
perror("ISCSISTART");
return -1;
}
if(doCAM(sess) == 0) {
syslog(LOG_WARNING, "no device found");
ioctl(sess->fd, ISCSISTOP);
return T15;
}
}
else {
if(ioctl(sess->fd, ISCSIRESTART)) {
perror("ISCSIRESTART");
return -1;
}
}
signal(SIGINT, trap);
signal(SIGHUP, trap);
signal(SIGTERM, trap);
sig = SIGUSR1;
signal(sig, trap);
if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
perror("ISCSISIGNAL");
return -1;
}
sess->flags |= SESS_FULLFEATURE;
sess->flags &= ~(SESS_REDIRECT | SESS_RECONNECT);
if(vflag)
printf("iscontrol: supervise starting main loop\n");
/*
| the main loop - actually do nothing
| all the work is done inside the kernel
*/
while((sess->flags & (SESS_REDIRECT|SESS_RECONNECT|SESS_DISCONNECT)) == 0) {
// do something?
// like sending a nop_out?
sleep(60);
}
printf("iscontrol: supervise going down\n");
syslog(LOG_INFO, "sess flags=%x", sess->flags);
sig = 0;
if(ioctl(sess->fd, ISCSISIGNAL, &sig)) {
perror("ISCSISIGNAL");
}
if(sess->flags & SESS_DISCONNECT) {
sess->flags &= ~SESS_FULLFEATURE;
return T9;
}
else {
val = 0;
if(ioctl(sess->fd, ISCSISTOP, &val)) {
perror("ISCSISTOP");
}
sess->flags |= SESS_INITIALLOGIN1;
}
return T8;
}
static int
handledDiscoveryResp(isess_t *sess, pdu_t *pp)
{
u_char *ptr;
int len, n;
debug_called(3);
len = pp->ds_len;
ptr = pp->ds_addr;
while(len > 0) {
if(*ptr != 0)
printf("%s\n", ptr);
n = strlen((char *)ptr) + 1;
len -= n;
ptr += n;
}
return 0;
}
static int
doDiscovery(isess_t *sess)
{
pdu_t spp;
text_req_t *tp = (text_req_t *)&spp.ipdu.bhs;
debug_called(3);
bzero(&spp, sizeof(pdu_t));
tp->cmd = ISCSI_TEXT_CMD /*| 0x40 */; // because of a bug in openiscsi-target
tp->F = 1;
tp->ttt = 0xffffffff;
addText(&spp, "SendTargets=All");
return sendPDU(sess, &spp, handledDiscoveryResp);
}
static trans_t
doLogin(isess_t *sess)
{
isc_opt_t *op = sess->op;
int status, count;
debug_called(3);
if(op->chapSecret == NULL && op->tgtChapSecret == NULL)
/*
| don't need any security negotiation
| or in other words: we don't have any secrets to exchange
*/
sess->csg = LON_PHASE;
else
sess->csg = SN_PHASE;
if(sess->tsih) {
sess->tsih = 0; // XXX: no 'reconnect' yet
sess->flags &= ~SESS_NEGODONE; // XXX: KLUDGE
}
count = 10; // should be more than enough
do {
debug(3, "count=%d csg=%d", count, sess->csg);
status = loginPhase(sess);
if(count-- == 0)
// just in case we get into a loop
status = -1;
} while(status == 0 && (sess->csg != FF_PHASE));
sess->flags &= ~SESS_INITIALLOGIN;
debug(3, "status=%d", status);
switch(status) {
case 0: // all is ok ...
sess->flags |= SESS_LOGGEDIN;
if(strcmp(sess->op->sessionType, "Discovery") == 0)
doDiscovery(sess);
return T5;
case 1: // redirect - temporary/permanent
/*
| start from scratch?
*/
sess->flags &= ~SESS_NEGODONE;
sess->flags |= (SESS_REDIRECT | SESS_INITIALLOGIN1);
syslog(LOG_DEBUG, "target sent REDIRECT");
return T7;
case 2: // initiator terminal error
return 0;
case 3: // target terminal error -- could retry ...
sleep(5);
return T7; // lets try
default:
return 0;
}
}
static int
handleLogoutResp(isess_t *sess, pdu_t *pp)
{
if(sess->flags & SESS_DISCONNECT) {
int val = 0;
if(ioctl(sess->fd, ISCSISTOP, &val)) {
perror("ISCSISTOP");
}
return 0;
}
return T13;
}
static trans_t
startLogout(isess_t *sess)
{
pdu_t spp;
logout_req_t *p = (logout_req_t *)&spp.ipdu.bhs;
bzero(&spp, sizeof(pdu_t));
p->cmd = ISCSI_LOGOUT_CMD| 0x40;
p->reason = BIT(7) | 0;
p->CID = htons(1);
return sendPDU(sess, &spp, handleLogoutResp);
}
static trans_t
inLogout(isess_t *sess)
{
if(sess->flags & SESS_RECONNECT)
return T18;
return 0;
}
typedef enum {
S1, S2, /*S3,*/ S4, S5, S6, S7, S8
} state_t;
/**
S1: FREE
S2: XPT_WAIT
S4: IN_LOGIN
S5: LOGGED_IN
S6: IN_LOGOUT
S7: LOGOUT_REQUESTED
S8: CLEANUP_WAIT
-------<-------------+
+--------->/ S1 \<----+ |
T13| +->\ /<-+ \ |
| / ---+--- \ \ |
| / | T2 \ | |
| T8 | |T1 | | |
| | | / |T7 |
| | | / | |
| | | / | |
| | V / / |
| | ------- / / |
| | / S2 \ / |
| | \ / / |
| | ---+--- / |
| | |T4 / |
| | V / | T18
| | ------- / |
| | / S4 \ |
| | \ / |
| | ---+--- | T15
| | |T5 +--------+---------+
| | | /T16+-----+------+ |
| | | / -+-----+--+ | |
| | | / / S7 \ |T12| |
| | | / +->\ /<-+ V V
| | | / / -+----- -------
| | | / /T11 |T10 / S8 \
| | V / / V +----+ \ /
| | ---+-+- ----+-- | -------
| | / S5 \T9 / S6 \<+ ^
| +-----\ /--->\ / T14 |
| ------- --+----+------+T17
+---------------------------+
*/
int
fsm(isc_opt_t *op)
{
state_t state;
isess_t *sess;
if((sess = calloc(1, sizeof(isess_t))) == NULL) {
// boy, is this a bad start ...
fprintf(stderr, "no memory!\n");
return -1;
}
state = S1;
sess->op = op;
sess->fd = -1;
sess->soc = -1;
sess->target.address = strdup(op->targetAddress);
sess->target.port = op->port;
sess->target.pgt = op->targetPortalGroupTag;
sess->flags = SESS_INITIALLOGIN | SESS_INITIALLOGIN1;
do {
switch(state) {
case S1:
switch(tcpConnect(sess)) {
case T1: state = S2; break;
default: state = S8; break;
}
break;
case S2:
switch(startSession(sess)) {
case T2: state = S1; break;
case T4: state = S4; break;
default: state = S8; break;
}
break;
case S4:
switch(doLogin(sess)) {
case T7: state = S1; break;
case T5: state = S5; break;
default: state = S8; break;
}
break;
case S5:
switch(supervise(sess)) {
case T8: state = S1; break;
case T9: state = S6; break;
case T11: state = S7; break;
case T15: state = S8; break;
default: state = S8; break;
}
break;
case S6:
switch(startLogout(sess)) {
case T13: state = S1; break;
case T14: state = S6; break;
case T16: state = S8; break;
default: state = S8; break;
}
break;
case S7:
switch(inLogout(sess)) {
case T18: state = S1; break;
case T10: state = S6; break;
case T12: state = S7; break;
case T16: state = S8; break;
default: state = S8; break;
}
break;
case S8:
// maybe do some clean up?
syslog(LOG_INFO, "terminated");
return 0;
}
} while(1);
}