Initial import of libiscsi
This commit is contained in:
Ronnie Sahlberg
378
lib/login.c
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378
lib/login.c
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/*
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Copyright (C) 2010 by Ronnie Sahlberg <ronniesahlberg@gmail.com>
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program; if not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _GNU_SOURCE
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#define _GNU_SOURCE
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#endif
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <arpa/inet.h>
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#include "iscsi.h"
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#include "iscsi-private.h"
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int
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iscsi_login_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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void *private_data)
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{
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struct iscsi_pdu *pdu;
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char *str;
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if (iscsi->is_loggedin != 0) {
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iscsi_set_error(iscsi, "Trying to login while already logged "
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"in.");
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return -1;
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}
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switch (iscsi->session_type) {
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case ISCSI_SESSION_DISCOVERY:
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case ISCSI_SESSION_NORMAL:
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break;
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default:
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iscsi_set_error(iscsi, "trying to login without setting "
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"session type.");
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return -1;
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}
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pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_LOGIN_REQUEST,
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ISCSI_PDU_LOGIN_RESPONSE);
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if (pdu == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
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"login pdu.");
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return -1;
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}
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/* login request */
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iscsi_pdu_set_immediate(pdu);
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/* flags */
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iscsi_pdu_set_pduflags(pdu, ISCSI_PDU_LOGIN_TRANSIT
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| ISCSI_PDU_LOGIN_CSG_OPNEG
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| ISCSI_PDU_LOGIN_NSG_FF);
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/* initiator name */
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)"InitiatorName=",
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14) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)iscsi->initiator_name,
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strlen(iscsi->initiator_name) +1) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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/* optional alias */
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if (iscsi->alias) {
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)"InitiatorAlias=",
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15) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)iscsi->alias,
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strlen(iscsi->alias) +1) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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}
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/* target name */
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if (iscsi->session_type == ISCSI_SESSION_NORMAL) {
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if (iscsi->target_name == NULL) {
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iscsi_set_error(iscsi, "Trying normal connect but "
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"target name not set.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)"TargetName=",
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11) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu,
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(unsigned char *)iscsi->target_name,
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strlen(iscsi->target_name) +1) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data "
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"failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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}
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/* session type */
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switch (iscsi->session_type) {
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case ISCSI_SESSION_DISCOVERY:
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str = (char *)"SessionType=Discovery";
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break;
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case ISCSI_SESSION_NORMAL:
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str = (char *)"SessionType=Normal";
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break;
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default:
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iscsi_set_error(iscsi, "Can not handle sessions %d yet.",
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iscsi->session_type);
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return -1;
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}
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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switch (iscsi->want_header_digest) {
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case ISCSI_HEADER_DIGEST_NONE:
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str = (char *)"HeaderDigest=None";
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break;
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case ISCSI_HEADER_DIGEST_NONE_CRC32C:
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str = (char *)"HeaderDigest=None,CRC32C";
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break;
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case ISCSI_HEADER_DIGEST_CRC32C_NONE:
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str = (char *)"HeaderDigest=CRC32C,None";
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break;
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case ISCSI_HEADER_DIGEST_CRC32C:
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str = (char *)"HeaderDigest=CRC32C";
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break;
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}
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"DataDigest=None";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"InitialR2T=Yes";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"ImmediateData=Yes";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"MaxBurstLength=262144";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"FirstBurstLength=262144";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"MaxRecvDataSegmentLength=262144";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"DataPDUInOrder=Yes";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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str = (char *)"DataSequenceInOrder=Yes";
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if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1)
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!= 0) {
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iscsi_set_error(iscsi, "Out-of-memory: pdu add data failed.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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pdu->callback = cb;
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pdu->private_data = private_data;
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if (iscsi_queue_pdu(iscsi, pdu) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
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"pdu.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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return 0;
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}
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int
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iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
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const unsigned char *hdr, int size)
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{
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int status;
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if (size < ISCSI_HEADER_SIZE) {
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iscsi_set_error(iscsi, "dont have enough data to read status "
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"from login reply");
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return -1;
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}
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status = ntohs(*(uint16_t *)&hdr[36]);
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if (status != 0) {
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pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
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pdu->private_data);
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return 0;
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}
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iscsi->statsn = ntohs(*(uint16_t *)&hdr[24]);
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/* XXX here we should parse the data returned in case the target
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* renegotiated some some parameters.
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* we should also do proper handshaking if the target is not yet
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* prepared to transition to the next stage
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*/
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/* skip past the header */
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hdr += ISCSI_HEADER_SIZE;
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size -= ISCSI_HEADER_SIZE;
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while (size > 0) {
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int len;
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len = strlen((char *)hdr);
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if (len == 0) {
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break;
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}
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if (len > size) {
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iscsi_set_error(iscsi, "len > size when parsing "
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"login data %d>%d", len, size);
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pdu->callback(iscsi, SCSI_STATUS_ERROR, NULL,
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pdu->private_data);
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return -1;
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}
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/* parse the strings */
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if (!strncmp((char *)hdr, "HeaderDigest=", 13)) {
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if (!strcmp((char *)hdr + 13, "CRC32C")) {
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iscsi->header_digest
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= ISCSI_HEADER_DIGEST_CRC32C;
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} else {
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iscsi->header_digest
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= ISCSI_HEADER_DIGEST_NONE;
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}
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}
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hdr += len + 1;
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size -= len + 1;
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}
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iscsi->is_loggedin = 1;
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pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
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return 0;
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}
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int
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iscsi_logout_async(struct iscsi_context *iscsi, iscsi_command_cb cb,
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void *private_data)
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{
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struct iscsi_pdu *pdu;
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if (iscsi->is_loggedin == 0) {
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iscsi_set_error(iscsi, "Trying to logout while not logged in.");
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return -1;
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}
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pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_LOGOUT_REQUEST,
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ISCSI_PDU_LOGOUT_RESPONSE);
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if (pdu == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate "
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"logout pdu.");
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return -1;
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}
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/* logout request has the immediate flag set */
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iscsi_pdu_set_immediate(pdu);
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/* flags : close the session */
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iscsi_pdu_set_pduflags(pdu, 0x80);
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pdu->callback = cb;
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pdu->private_data = private_data;
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if (iscsi_queue_pdu(iscsi, pdu) != 0) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to queue iscsi "
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"logout pdu.");
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iscsi_free_pdu(iscsi, pdu);
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return -1;
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}
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return 0;
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}
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int
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iscsi_process_logout_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
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const unsigned char *hdr _U_, int size _U_)
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{
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iscsi->is_loggedin = 0;
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pdu->callback(iscsi, SCSI_STATUS_GOOD, NULL, pdu->private_data);
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return 0;
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}
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int
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iscsi_set_session_type(struct iscsi_context *iscsi,
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enum iscsi_session_type session_type)
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{
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if (iscsi->is_loggedin) {
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iscsi_set_error(iscsi, "trying to set session type while "
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"logged in");
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return -1;
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}
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iscsi->session_type = session_type;
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return 0;
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}
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