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95a0d98cfda242f49ba8f32d0b314f1961e40b36
libiscsi/lib/login.c
Ronnie Sahlberg 95a0d98cfd Add support for CHAP using SHA1 
Signed-off-by: Ronnie Sahlberg <ronniesahlberg@gmail.com>
2025-01-04 00:59:02 +10:00

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/*
Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2.1 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 Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#ifndef _GNU_SOURCE
#define _GNU_SOURCE
#endif
#ifdef HAVE_CONFIG_H
#include "config.h"
#endif
#ifdef HAVE_SYS_TYPES_H
#include <sys/types.h>
#endif
#ifdef HAVE_ARPA_INET_H
#include <arpa/inet.h>
#endif
#if defined(_WIN32)
#include <winsock2.h>
#include "win32/win32_compat.h"
#endif
#include <stdio.h>
#include <assert.h>
#include <stdlib.h>
#include <string.h>
#include "iscsi.h"
#include "iscsi-private.h"
#include "scsi-lowlevel.h"
#include "md5.h"
#include "sha.h"
#ifdef HAVE_LIBGNUTLS
#include <gnutls/crypto.h>
#endif
#ifdef HAVE_LIBGCRYPT
#include <gcrypt.h>
#endif
static int
iscsi_login_add_initiatorname(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send InitiatorName during opneg or the first leg of secneg */
if (iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "InitiatorName=%s", iscsi->initiator_name) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_alias(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send InitiatorAlias during opneg or the first leg of secneg */
if (iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "InitiatorAlias=%s", iscsi->alias) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_targetname(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send TargetName during opneg or the first leg of secneg */
if ((iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG
&& iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP)
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
if (!iscsi->target_name[0]) {
iscsi_set_error(iscsi, "Trying normal connect but "
"target name not set.");
return -1;
}
if (snprintf(str, MAX_STRING_SIZE, "TargetName=%s", iscsi->target_name) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_sessiontype(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send SessionType during opneg or the first leg of secneg */
if (iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
switch (iscsi->session_type) {
case ISCSI_SESSION_DISCOVERY:
strncpy(str,"SessionType=Discovery",MAX_STRING_SIZE);
break;
case ISCSI_SESSION_NORMAL:
strncpy(str,"SessionType=Normal",MAX_STRING_SIZE);
break;
default:
iscsi_set_error(iscsi, "Can not handle sessions %d yet.",
iscsi->session_type);
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_headerdigest(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send HeaderDigest during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
switch (iscsi->want_header_digest) {
case ISCSI_HEADER_DIGEST_NONE:
strncpy(str,"HeaderDigest=None",MAX_STRING_SIZE);
break;
case ISCSI_HEADER_DIGEST_NONE_CRC32C:
strncpy(str,"HeaderDigest=None,CRC32C",MAX_STRING_SIZE);
break;
case ISCSI_HEADER_DIGEST_CRC32C_NONE:
strncpy(str,"HeaderDigest=CRC32C,None",MAX_STRING_SIZE);
break;
case ISCSI_HEADER_DIGEST_CRC32C:
strncpy(str,"HeaderDigest=CRC32C",MAX_STRING_SIZE);
break;
default:
iscsi_set_error(iscsi, "invalid header digest value");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_datadigest(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DataDigest during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
switch (iscsi->want_data_digest) {
case ISCSI_DATA_DIGEST_NONE:
strncpy(str,"DataDigest=None",MAX_STRING_SIZE);
break;
case ISCSI_DATA_DIGEST_NONE_CRC32C:
strncpy(str,"DataDigest=None,CRC32C",MAX_STRING_SIZE);
break;
case ISCSI_DATA_DIGEST_CRC32C_NONE:
strncpy(str,"DataDigest=CRC32C,None",MAX_STRING_SIZE);
break;
case ISCSI_DATA_DIGEST_CRC32C:
strncpy(str,"DataDigest=CRC32C",MAX_STRING_SIZE);
break;
default:
iscsi_set_error(iscsi, "invalid data digest value");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_initialr2t(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send InitialR2T during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "InitialR2T=%s", iscsi->want_initial_r2t == ISCSI_INITIAL_R2T_NO ?
"No" : "Yes") == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_immediatedata(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send ImmediateData during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "ImmediateData=%s", iscsi->want_immediate_data == ISCSI_IMMEDIATE_DATA_NO ?
"No" : "Yes") == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxburstlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send MaxBurstLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "MaxBurstLength=%d", iscsi->max_burst_length) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_firstburstlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send FirstBurstLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "FirstBurstLength=%d", iscsi->first_burst_length) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxrecvdatasegmentlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send MaxRecvDataSegmentLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "MaxRecvDataSegmentLength=%d", iscsi->initiator_max_recv_data_segment_length) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_datapduinorder(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DataPduInOrder during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"DataPDUInOrder=Yes",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_defaulttime2wait(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DefaultTime2Wait during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"DefaultTime2Wait=2",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_defaulttime2retain(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DefaultTime2Retain during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"DefaultTime2Retain=0",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_ifmarker(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send IFMarker during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"IFMarker=No",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_ofmarker(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send OFMarker during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"OFMarker=No",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxconnections(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send MaxConnections during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"MaxConnections=1",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_maxoutstandingr2t(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send MaxOutstandingR2T during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"MaxOutstandingR2T=1",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_errorrecoverylevel(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send ErrorRecoveryLevel during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"ErrorRecoveryLevel=0",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_datasequenceinorder(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DataSequenceInOrder during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
strncpy(str,"DataSequenceInOrder=Yes",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_authmethod(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
return 0;
}
strncpy(str,"AuthMethod=CHAP,None",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_authalgorithm(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SELECT_ALGORITHM) {
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "CHAP_A=%d", iscsi->chap_auth) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: snprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_chap_username(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
return 0;
}
strncpy(str,"CHAP_N=",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str))
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu,
(unsigned char *)iscsi->user,
strlen(iscsi->user) +1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_rdma_extensions(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send DataSequenceInOrder during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
/* RDMAExtensions is only valid for iSER transport */
if (iscsi->transport != ISER_TRANSPORT)
{
return 0;
}
strncpy(str,"RDMAExtensions=Yes",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_initiatorrecvdatasegmentlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send InitiatorRecvDataSegmentLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
/* InitiatorRecvDataSegmentLength is only valid for iSER transport */
if (iscsi->transport != ISER_TRANSPORT)
{
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "InitiatorRecvDataSegmentLength=%d",
iscsi->initiator_max_recv_data_segment_length) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
iscsi_login_add_targetrecvdatasegmentlength(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
/* We only send InitiatorRecvDataSegmentLength during opneg */
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_OPNEG) {
return 0;
}
/* TargetRecvDataSegmentLength is only valid for iSER transport */
if (iscsi->transport != ISER_TRANSPORT)
{
return 0;
}
if (snprintf(str, MAX_STRING_SIZE, "TargetRecvDataSegmentLength=%d",
iscsi->target_max_recv_data_segment_length) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
return 0;
}
static int
h2i(int h)
{
if (h >= 'a' && h <= 'f') {
return h - 'a' + 10;
}
if (h >= 'A' && h <= 'F') {
return h - 'A' + 10;
}
return h - '0';
}
static int
i2h(int i)
{
if (i >= 10) {
return i - 10 + 'A';
}
return i + '0';
}
#if defined HAVE_LIBGNUTLS
#define md5_context_t gnutls_hash_hd_t
#define md5_open(hd) gnutls_hash_init(hd, GNUTLS_DIG_MD5)
#define md5_write gnutls_hash
#define md5_read gnutls_hash_output
static void md5_close(md5_context_t h)
{
unsigned char digest[16];
gnutls_hash_deinit(h, digest);
}
#elif defined HAVE_LIBGCRYPT
typedef gcry_md_hd_t md5_context_t;
#define md5_open(hd) gcry_md_open(hd, GCRY_MD_MD5, 0)
#define md5_write gcry_md_write
#define md5_close gcry_md_close
static void md5_read(md5_context_t h, uint8_t *result)
{
memcpy(result, gcry_md_read(h, 0), 16);
}
#else
typedef struct MD5Context *md5_context_t;
#define md5_write MD5Update
static void md5_open(md5_context_t *hd)
{
*hd = malloc(sizeof(struct MD5Context));
if (*hd) {
MD5Init(*hd);
}
}
static void md5_read(md5_context_t h, uint8_t *result)
{
unsigned char digest[16];
MD5Final(digest, h);
memcpy(result, digest, sizeof(digest));
}
static void md5_close(md5_context_t h)
{
memset(h, 0, sizeof(*h));
free(h);
}
#endif
static inline void md5_putc(md5_context_t h, unsigned char c)
{
md5_write(h, &c, 1);
}
static void compute_chap_r_md5(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
unsigned char *strp;
unsigned char c;
md5_context_t ctx;
md5_open(&ctx);
md5_putc(ctx, chap_i);
md5_write(ctx, passwd, strlen((char *)passwd));
strp = chap_c;
while (*strp != 0) {
c = (h2i(strp[0]) << 4) | h2i(strp[1]);
strp += 2;
md5_putc(ctx, c);
}
md5_read(ctx, digest);
md5_close(ctx);
}
static void compute_chap_r_sha1(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
unsigned char *strp;
unsigned char c;
SHA1Context ctx;
SHA1Reset(&ctx);
c = chap_i;
SHA1Input(&ctx, &c, 1);
SHA1Input(&ctx, passwd, strlen((char *)passwd));
strp = chap_c;
while (*strp != 0) {
c = (h2i(strp[0]) << 4) | h2i(strp[1]);
strp += 2;
SHA1Input(&ctx, &c, 1);
}
SHA1Result(&ctx, digest);
}
static void compute_chap_r(struct iscsi_context *iscsi, int chap_i,
unsigned char *passwd,
unsigned char *chap_c,
unsigned char *digest)
{
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
return compute_chap_r_md5(iscsi, chap_i, passwd, chap_c, digest);
case ISCSI_CHAP_SHA_1:
return compute_chap_r_sha1(iscsi, chap_i, passwd, chap_c, digest);
}
}
static int
iscsi_login_add_chap_response(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
{
char str[MAX_STRING_SIZE+1];
unsigned char c, cc[2];
char digest[MAX_CHAP_R_SIZE];
int i;
int chap_r_size = 0;
if (iscsi->current_phase != ISCSI_PDU_LOGIN_CSG_SECNEG
|| iscsi->secneg_phase != ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
return 0;
}
if (!iscsi->chap_c[0]) {
iscsi_set_error(iscsi, "No CHAP challenge found");
return -1;
}
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
chap_r_size = 16;
break;
case ISCSI_CHAP_SHA_1:
chap_r_size = 20;
break;
}
compute_chap_r(iscsi, iscsi->chap_i,
(unsigned char *)iscsi->passwd,
(unsigned char *)iscsi->chap_c,
(unsigned char *)digest);
strncpy(str,"CHAP_R=0x",MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str))
!= 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
return -1;
}
for (i = 0; i < chap_r_size; i++) {
c = digest[i];
cc[0] = i2h((c >> 4)&0x0f);
cc[1] = i2h((c )&0x0f);
if (iscsi_pdu_add_data(iscsi, pdu, &cc[0], 2) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
}
c = 0;
if (iscsi_pdu_add_data(iscsi, pdu, &c, 1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
/* bidirectional chap */
if (iscsi->target_user[0]) {
char target_chap_c[MAX_CHAP_R_SIZE * 2];
iscsi->target_chap_i++;
snprintf(str, MAX_STRING_SIZE, "CHAP_I=%d",
iscsi->target_chap_i);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str,
strlen(str) + 1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add "
"data failed.");
return -1;
}
for (i = 0; i < chap_r_size * 2; i++) {
target_chap_c[i] = rand()&0xff;
}
strncpy(str, "CHAP_C=0x", MAX_STRING_SIZE);
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str,
strlen(str)) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
for (i = 0; i < chap_r_size * 2; i++) {
c = target_chap_c[i];
cc[0] = i2h((c >> 4)&0x0f);
cc[1] = i2h((c )&0x0f);
if (iscsi_pdu_add_data(iscsi, pdu, &cc[0], 2) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add "
"data failed.");
return -1;
}
}
c = 0;
if (iscsi_pdu_add_data(iscsi, pdu, &c, 1) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
"failed.");
return -1;
}
compute_chap_r(iscsi, iscsi->target_chap_i,
(unsigned char *)iscsi->target_passwd,
(unsigned char *)target_chap_c,
(unsigned char *)iscsi->target_chap_r);
}
return 0;
}
int
iscsi_login_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data)
{
struct iscsi_pdu *pdu;
int transit;
if (iscsi->login_attempts++ > 10) {
iscsi_set_error(iscsi, "login took too many tries."
" giving up.");
return -1;
}
if (iscsi->is_loggedin != 0) {
iscsi_set_error(iscsi, "Trying to login while already logged "
"in.");
return -1;
}
switch (iscsi->session_type) {
case ISCSI_SESSION_DISCOVERY:
case ISCSI_SESSION_NORMAL:
break;
default:
iscsi_set_error(iscsi, "trying to login without setting "
"session type.");
return -1;
}
/* randomize cmdsn and itt */
if (!iscsi->current_phase && !iscsi->secneg_phase) {
iscsi->itt = (uint32_t) rand();
iscsi->cmdsn = (uint32_t) rand();
iscsi->expcmdsn = iscsi->maxcmdsn = iscsi->min_cmdsn_waiting = iscsi->cmdsn;
}
pdu = iscsi_allocate_pdu(iscsi,
ISCSI_PDU_LOGIN_REQUEST,
ISCSI_PDU_LOGIN_RESPONSE,
iscsi->itt,
ISCSI_PDU_DROP_ON_RECONNECT);
if (pdu == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
"login pdu.");
return -1;
}
/* login request */
iscsi_pdu_set_immediate(pdu);
/* cmdsn is not increased if Immediate delivery*/
iscsi_pdu_set_cmdsn(pdu, iscsi->cmdsn);
if (!iscsi->user[0]) {
iscsi->current_phase = ISCSI_PDU_LOGIN_CSG_OPNEG;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_SECNEG) {
iscsi->next_phase = ISCSI_PDU_LOGIN_NSG_OPNEG;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_OPNEG) {
iscsi->next_phase = ISCSI_PDU_LOGIN_NSG_FF;
}
transit = 0;
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_OPNEG) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
if (iscsi->current_phase == ISCSI_PDU_LOGIN_CSG_SECNEG) {
if (iscsi->secneg_phase == ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
if (iscsi->secneg_phase == ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE) {
transit = ISCSI_PDU_LOGIN_TRANSIT;
}
}
/* flags */
iscsi_pdu_set_pduflags(pdu, transit
| iscsi->current_phase
| iscsi->next_phase);
/* initiator name */
if (iscsi_login_add_initiatorname(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* optional alias */
if (iscsi->alias[0]) {
if (iscsi_login_add_alias(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
}
/* target name */
if (iscsi->session_type == ISCSI_SESSION_NORMAL) {
if (iscsi_login_add_targetname(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
}
/* session type */
if (iscsi_login_add_sessiontype(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* header digest */
if (iscsi_login_add_headerdigest(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* auth method */
if (iscsi_login_add_authmethod(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* auth algorithm */
if (iscsi_login_add_authalgorithm(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* chap username */
if (iscsi_login_add_chap_username(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* chap response */
if (iscsi_login_add_chap_response(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* data digest */
if (iscsi_login_add_datadigest(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* initial r2t */
if (iscsi_login_add_initialr2t(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* immediate data */
if (iscsi_login_add_immediatedata(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* max burst length */
if (iscsi_login_add_maxburstlength(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* first burst length */
if (iscsi_login_add_firstburstlength(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* default time 2 wait */
if (iscsi_login_add_defaulttime2wait(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* default time 2 retain */
if (iscsi_login_add_defaulttime2retain(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* max outstanding r2t */
if (iscsi_login_add_maxoutstandingr2t(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* errorrecoverylevel */
if (iscsi_login_add_errorrecoverylevel(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* ifmarker */
if (iscsi_login_add_ifmarker(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* ofmarker */
if (iscsi_login_add_ofmarker(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* maxconnections */
if (iscsi_login_add_maxconnections(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* max recv data segment length */
if (iscsi_login_add_maxrecvdatasegmentlength(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* data pdu in order */
if (iscsi_login_add_datapduinorder(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* data sequence in order */
if (iscsi_login_add_datasequenceinorder(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* rdmaextensions */
if (iscsi_login_add_rdma_extensions(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* initiator recv data segment length */
if (iscsi_login_add_initiatorrecvdatasegmentlength(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
/* target recv data segment length */
if (iscsi_login_add_targetrecvdatasegmentlength(iscsi, pdu) != 0) {
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
pdu->callback = cb;
pdu->private_data = private_data;
if (iscsi_queue_pdu(iscsi, pdu) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
"pdu.");
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
return 0;
}
static const char *login_error_str(int status)
{
switch (status) {
case 0x0100: return "Target moved (unknown)"; /* Some don't set the detail */
case 0x0101: return "Target moved temporarily";
case 0x0102: return "Target moved permanently";
case 0x0200: return "Initiator error";
case 0x0201: return "Authentication failure";
case 0x0202: return "Authorization failure";
case 0x0203: return "Target not found";
case 0x0204: return "Target removed";
case 0x0205: return "Unsupported version";
case 0x0206: return "Too many connections";
case 0x0207: return "Missing parameter";
case 0x0208: return "Can't include in session";
case 0x0209: return "Session type not supported";
case 0x020a: return "Session does not exist";
case 0x020b: return "Invalid during login";
case 0x0300: return "Target error";
case 0x0301: return "Service unavailable";
case 0x0302: return "Out of resources";
}
return "Unknown login error";
}
int
iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
struct iscsi_in_pdu *in)
{
uint32_t status;
char *ptr = (char *)in->data;
int size = in->data_pos;
int must_have_chap_n = 0;
int must_have_chap_r = 0;
status = scsi_get_uint16(&in->hdr[36]);
// Status-Class is 0
if (!(status >> 8)) {
if (!iscsi->current_phase && !iscsi->secneg_phase) {
iscsi->statsn = scsi_get_uint32(&in->hdr[24]);
}
}
/* Using bidirectional CHAP? Then we must see a chap_n and chap_r
* field in this PDU
*/
if ((in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT)
&& (in->hdr[1] & ISCSI_PDU_LOGIN_CSG_FF) == ISCSI_PDU_LOGIN_CSG_SECNEG
&& iscsi->target_user[0]) {
must_have_chap_n = 1;
must_have_chap_r = 1;
}
/* XXX here we should parse the data returned in case the target
* renegotiated some some parameters.
* we should also do proper handshaking if the target is not yet
* prepared to transition to the next stage
*/
while (size > 0) {
char *end;
int len;
end = memchr(ptr, 0, size);
if (end == NULL) {
iscsi_set_error(iscsi, "NUL not found after offset %ld "
"when parsing login data",
(long)((unsigned char *)ptr - in->data));
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return -1;
}
len = end - ptr;
if (len == 0) {
break;
}
/* parse the strings */
if (!strncmp(ptr, "TargetAddress=", 14)) {
strncpy(iscsi->target_address,ptr+14,MAX_STRING_SIZE);
}
if (!strncmp(ptr, "HeaderDigest=", 13)) {
if (!strcmp(ptr + 13, "CRC32C")) {
iscsi->want_header_digest
= ISCSI_HEADER_DIGEST_CRC32C;
} else {
iscsi->want_header_digest
= ISCSI_HEADER_DIGEST_NONE;
}
}
if (!strncmp(ptr, "DataDigest=", 11)) {
if (!strcmp(ptr + 11, "CRC32C")) {
iscsi->want_data_digest
= ISCSI_DATA_DIGEST_CRC32C;
} else {
iscsi->want_data_digest
= ISCSI_DATA_DIGEST_NONE;
}
}
if (!strncmp(ptr, "FirstBurstLength=", 17)) {
iscsi->first_burst_length = strtol(ptr + 17, NULL, 10);
}
if (!strncmp(ptr, "InitialR2T=", 11)) {
if (!strcmp(ptr + 11, "No")) {
iscsi->use_initial_r2t = ISCSI_INITIAL_R2T_NO;
} else {
iscsi->use_initial_r2t = ISCSI_INITIAL_R2T_YES;
}
}
if (!strncmp(ptr, "ImmediateData=", 14)) {
if (!strcmp(ptr + 14, "No")) {
iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
} else if (iscsi->want_immediate_data == ISCSI_IMMEDIATE_DATA_NO) {
/* If we negotiated NO, it doesnt matter what
* the target said. ImmediateData is NO.
*/
iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_NO;
}
}
if (!strncmp(ptr, "MaxBurstLength=", 15)) {
iscsi->max_burst_length = strtol(ptr + 15, NULL, 10);
}
if (!strncmp(ptr, "MaxRecvDataSegmentLength=", 25)) {
iscsi->target_max_recv_data_segment_length = strtol(ptr + 25, NULL, 10);
}
/* iSER specific keys */
if (!strncmp(ptr, "InitiatorRecvDataSegmentLength=", 31)) {
iscsi->initiator_max_recv_data_segment_length = MIN(strtoul(ptr + 31, NULL, 10),
iscsi->initiator_max_recv_data_segment_length);
}
if (!strncmp(ptr, "TargetRecvDataSegmentLength=", 28)) {
iscsi->target_max_recv_data_segment_length = MIN(strtoul(ptr + 28, NULL, 10),
iscsi->target_max_recv_data_segment_length);
}
if (!strncmp(ptr, "AuthMethod=", 11)) {
if (!strcmp(ptr + 11, "CHAP")) {
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SELECT_ALGORITHM;
}
}
if (!strncmp(ptr, "CHAP_A=", 7)) {
iscsi->chap_a = atoi(ptr+7);
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
if (!strncmp(ptr, "CHAP_I=", 7)) {
iscsi->chap_i = atoi(ptr+7);
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
if (!strncmp(ptr, "CHAP_C=0x", 9)) {
if (len-9 > MAX_CHAP_C_LENGTH) {
iscsi_set_error(iscsi, "Wrong length of CHAP_C received from"
" target (%d, max: %d)", len-9, MAX_CHAP_C_LENGTH);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
*iscsi->chap_c = '\0';
strncat(iscsi->chap_c,ptr+9,len-9);
iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_SEND_RESPONSE;
}
if (!strncmp(ptr, "CHAP_N=", 7)) {
if (strcmp(iscsi->target_user, ptr + 7)) {
iscsi_set_error(iscsi, "Failed to log in to"
" target. Wrong CHAP targetname"
" received: %s", ptr + 7);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
must_have_chap_n = 0;
}
if (!strncmp(ptr, "CHAP_R=0x", 9)) {
int i, chap_r_size = 0;
switch (iscsi->chap_auth) {
case ISCSI_CHAP_MD5:
chap_r_size = 16;
break;
case ISCSI_CHAP_SHA_1:
chap_r_size = 20;
break;
}
if (len != 9 + 2 * chap_r_size) {
iscsi_set_error(iscsi, "Wrong size of CHAP_R"
" received from target.");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
for (i = 0; i < chap_r_size; i++) {
unsigned char c;
c = ((h2i(ptr[9 + 2 * i]) << 4) | h2i(ptr[9 + 2 * i + 1]));
if (c != iscsi->target_chap_r[i]) {
iscsi_set_error(iscsi, "Authentication "
"failed. Invalid CHAP_R "
"response from the target");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR,
NULL, pdu->private_data);
}
return 0;
}
}
must_have_chap_r = 0;
}
ISCSI_LOG(iscsi, 6, "TargetLoginReply: %s", ptr);
ptr += len + 1;
size -= len + 1;
}
if (status == SCSI_STATUS_REDIRECT && iscsi->target_address[0]) {
ISCSI_LOG(iscsi, 2, "target requests redirect to %s",iscsi->target_address);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_REDIRECT, NULL,
pdu->private_data);
}
return 0;
}
if (status != 0) {
iscsi_set_error(iscsi, "Failed to log in to target. Status: %s(%d)",
login_error_str(status), status);
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
if (must_have_chap_n) {
iscsi_set_error(iscsi, "Failed to log in to target. "
"It did not return CHAP_N during SECNEG.");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
if (must_have_chap_r) {
iscsi_set_error(iscsi, "Failed to log in to target. "
"It did not return CHAP_R during SECNEG.");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
pdu->private_data);
}
return 0;
}
if (in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT) {
iscsi->current_phase = (in->hdr[1] & ISCSI_PDU_LOGIN_NSG_FF) << 2;
}
if ((in->hdr[1] & ISCSI_PDU_LOGIN_TRANSIT)
&& (in->hdr[1] & ISCSI_PDU_LOGIN_NSG_FF) == ISCSI_PDU_LOGIN_NSG_FF) {
iscsi->is_loggedin = 1;
iscsi_itt_post_increment(iscsi);
iscsi->header_digest = iscsi->want_header_digest;
iscsi->data_digest = iscsi->want_data_digest;
ISCSI_LOG(iscsi, 2, "login successful");
pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
} else {
if (iscsi_login_async(iscsi, pdu->callback, pdu->private_data) != 0) {
iscsi_set_error(iscsi, "Failed to send continuation login pdu");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL, pdu->private_data);
}
}
}
return 0;
}
int
iscsi_logout_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
void *private_data)
{
struct iscsi_pdu *pdu;
iscsi->login_attempts = 0;
if (iscsi->is_loggedin == 0) {
iscsi_set_error(iscsi, "Trying to logout while not logged in.");
return -1;
}
pdu = iscsi_allocate_pdu(iscsi,
ISCSI_PDU_LOGOUT_REQUEST,
ISCSI_PDU_LOGOUT_RESPONSE,
iscsi_itt_post_increment(iscsi),
ISCSI_PDU_DROP_ON_RECONNECT|ISCSI_PDU_CORK_WHEN_SENT);
if (pdu == NULL) {
iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
"logout pdu.");
return -1;
}
/* logout request has the immediate flag set */
iscsi_pdu_set_immediate(pdu);
/* flags : close the session */
iscsi_pdu_set_pduflags(pdu, 0x80);
/* cmdsn is not increased if Immediate delivery*/
iscsi_pdu_set_cmdsn(pdu, iscsi->cmdsn);
pdu->callback = cb;
pdu->private_data = private_data;
if (iscsi_queue_pdu(iscsi, pdu) != 0) {
iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
"logout pdu.");
iscsi->drv->free_pdu(iscsi, pdu);
return -1;
}
return 0;
}
int
iscsi_process_logout_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
struct iscsi_in_pdu *in)
{
iscsi->is_loggedin = 0;
ISCSI_LOG(iscsi, 2, "logout successful");
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
}
return 0;
}
int
iscsi_set_session_type(struct iscsi_context *iscsi,
enum iscsi_session_type session_type)
{
if (iscsi->is_loggedin) {
iscsi_set_error(iscsi, "trying to set session type while "
"logged in");
return -1;
}
iscsi->session_type = session_type;
return 0;
}
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