7253a667ae
A Portal URL is of the form iscsi://[<username>[%<password>]@]<host>[:<port>] and is used by command such as iscsi-ls during the discovery login phase. During discovery we do not yet know the target iqn name, nor the lun of any devices.
489 lines
11 KiB
C
489 lines
11 KiB
C
/*
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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 2.1 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 Lesser 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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#define _GNU_SOURCE
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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 <strings.h>
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#include <stdlib.h>
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#include <stdarg.h>
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#include <sys/types.h>
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#include <unistd.h>
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#include <time.h>
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#include "iscsi.h"
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#include "iscsi-private.h"
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#include "slist.h"
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#define ISCSI_URL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
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"<host>[:<port>]/<target-iqn>/<lun>\""
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#define ISCSI_PURL_SYNTAX "\"iscsi://[<username>[%<password>]@]" \
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"<host>[:<port>]\""
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struct iscsi_context *
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iscsi_create_context(const char *initiator_name)
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{
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struct iscsi_context *iscsi;
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iscsi = malloc(sizeof(struct iscsi_context));
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if (iscsi == NULL) {
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return NULL;
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}
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bzero(iscsi, sizeof(struct iscsi_context));
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iscsi->initiator_name = strdup(initiator_name);
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if (iscsi->initiator_name == NULL) {
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free(iscsi);
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return NULL;
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}
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iscsi->fd = -1;
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/* initialize to a "random" isid */
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iscsi_set_isid_random(iscsi, getpid() ^ time(NULL));
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/* assume we start in security negotiation phase */
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iscsi->current_phase = ISCSI_PDU_LOGIN_CSG_SECNEG;
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iscsi->next_phase = ISCSI_PDU_LOGIN_NSG_OPNEG;
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iscsi->secneg_phase = ISCSI_LOGIN_SECNEG_PHASE_OFFER_CHAP;
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iscsi->max_burst_length = 262144;
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iscsi->first_burst_length = 262144;
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iscsi->initiator_max_recv_data_segment_length = 262144;
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iscsi->target_max_recv_data_segment_length = 8192;
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iscsi->want_initial_r2t = ISCSI_INITIAL_R2T_NO;
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iscsi->use_initial_r2t = ISCSI_INITIAL_R2T_NO;
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iscsi->want_immediate_data = ISCSI_IMMEDIATE_DATA_YES;
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iscsi->use_immediate_data = ISCSI_IMMEDIATE_DATA_YES;
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return iscsi;
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}
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int
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iscsi_set_isid_random(struct iscsi_context *iscsi, int rnd)
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{
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iscsi->isid[0] = 0x80;
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iscsi->isid[1] = rnd&0xff;
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iscsi->isid[2] = rnd&0xff;
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iscsi->isid[3] = rnd&0xff;
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iscsi->isid[4] = 0;
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iscsi->isid[5] = 0;
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return 0;
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}
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int
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iscsi_set_alias(struct iscsi_context *iscsi, const char *alias)
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{
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if (iscsi->is_loggedin != 0) {
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iscsi_set_error(iscsi, "Already logged in when adding alias");
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return -1;
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}
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free(discard_const(iscsi->alias));
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iscsi->alias = strdup(alias);
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if (iscsi->alias == NULL) {
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iscsi_set_error(iscsi, "Failed to allocate alias name");
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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_set_targetname(struct iscsi_context *iscsi, const char *target_name)
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{
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if (iscsi->is_loggedin != 0) {
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iscsi_set_error(iscsi, "Already logged in when adding "
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"targetname");
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return -1;
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}
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free(discard_const(iscsi->target_name));
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iscsi->target_name = strdup(target_name);
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if (iscsi->target_name == NULL) {
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iscsi_set_error(iscsi, "Failed to allocate target name");
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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_destroy_context(struct iscsi_context *iscsi)
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{
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struct iscsi_pdu *pdu;
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if (iscsi == NULL) {
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return 0;
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}
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if (iscsi->fd != -1) {
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iscsi_disconnect(iscsi);
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}
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while ((pdu = iscsi->outqueue)) {
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SLIST_REMOVE(&iscsi->outqueue, pdu);
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if ( !(pdu->flags & ISCSI_PDU_NO_CALLBACK)) {
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pdu->callback(iscsi, SCSI_STATUS_CANCELLED, NULL,
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pdu->private_data);
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}
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iscsi_free_pdu(iscsi, pdu);
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}
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while ((pdu = iscsi->waitpdu)) {
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SLIST_REMOVE(&iscsi->waitpdu, pdu);
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pdu->callback(iscsi, SCSI_STATUS_CANCELLED, NULL,
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pdu->private_data);
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iscsi_free_pdu(iscsi, pdu);
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}
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free(discard_const(iscsi->initiator_name));
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iscsi->initiator_name = NULL;
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free(discard_const(iscsi->target_name));
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iscsi->target_name = NULL;
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free(discard_const(iscsi->alias));
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iscsi->alias = NULL;
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if (iscsi->incoming != NULL) {
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iscsi_free_iscsi_in_pdu(iscsi->incoming);
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}
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if (iscsi->inqueue != NULL) {
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iscsi_free_iscsi_inqueue(iscsi->inqueue);
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}
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free(iscsi->error_string);
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iscsi->error_string = NULL;
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free(discard_const(iscsi->user));
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iscsi->user = NULL;
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free(discard_const(iscsi->passwd));
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iscsi->passwd = NULL;
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free(discard_const(iscsi->chap_c));
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iscsi->chap_c = NULL;
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free(iscsi);
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return 0;
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}
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void
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iscsi_set_error(struct iscsi_context *iscsi, const char *error_string, ...)
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{
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va_list ap;
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char *str;
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va_start(ap, error_string);
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if (vasprintf(&str, error_string, ap) < 0) {
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/* not much we can do here */
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str = NULL;
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}
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free(iscsi->error_string);
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iscsi->error_string = str;
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va_end(ap);
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}
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const char *
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iscsi_get_error(struct iscsi_context *iscsi)
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{
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return iscsi->error_string;
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}
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int
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iscsi_set_header_digest(struct iscsi_context *iscsi,
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enum iscsi_header_digest header_digest)
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{
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if (iscsi->is_loggedin) {
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iscsi_set_error(iscsi, "trying to set header digest while "
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"logged in");
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return -1;
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}
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iscsi->want_header_digest = header_digest;
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return 0;
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}
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int
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iscsi_is_logged_in(struct iscsi_context *iscsi)
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{
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return iscsi->is_loggedin;
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}
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struct iscsi_url *
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iscsi_parse_full_url(struct iscsi_context *iscsi, const char *url)
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{
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struct iscsi_url *iscsi_url;
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char *str;
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char *portal;
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char *user = NULL;
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char *passwd = NULL;
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char *target;
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char *lun;
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char *tmp;
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int l;
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if (strncmp(url, "iscsi://", 8)) {
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iscsi_set_error(iscsi, "Invalid URL %s\niSCSI URL must be of "
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"the form: %s",
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url,
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ISCSI_URL_SYNTAX);
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return NULL;
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}
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str = strdup(url + 8);
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if (str == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup url %s", url);
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return NULL;
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}
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portal = str;
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user = getenv("LIBISCSI_CHAP_USERNAME");
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passwd = getenv("LIBISCSI_CHAP_PASSWORD");
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tmp = index(portal, '@');
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if (tmp != NULL) {
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user = portal;
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*tmp++ = 0;
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portal = tmp;
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tmp = index(user, '%');
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if (tmp != NULL) {
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*tmp++ = 0;
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passwd = tmp;
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}
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}
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target = index(portal, '/');
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if (target == NULL) {
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iscsi_set_error(iscsi, "Invalid URL %s\nCould not parse "
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"'<target-iqn>'\niSCSI URL must be of the "
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"form: %s",
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url,
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ISCSI_URL_SYNTAX);
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free(str);
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return NULL;
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}
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*target++ = 0;
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if (*target == 0) {
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iscsi_set_error(iscsi, "Invalid URL %s\nCould not parse "
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"<target-iqn>\n"
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"iSCSI URL must be of the form: %s",
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url,
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ISCSI_URL_SYNTAX);
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free(str);
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return NULL;
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}
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lun = index(target, '/');
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if (lun == NULL) {
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iscsi_set_error(iscsi, "Invalid URL %s\nCould not parse <lun>\n"
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"iSCSI URL must be of the form: %s",
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url,
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ISCSI_URL_SYNTAX);
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free(str);
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return NULL;
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}
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*lun++ = 0;
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l = strtol(lun, &tmp, 10);
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if (*lun == 0 || *tmp != 0) {
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iscsi_set_error(iscsi, "Invalid URL %s\nCould not parse <lun>\n"
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"iSCSI URL must be of the form: %s",
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url,
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ISCSI_URL_SYNTAX);
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free(str);
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return NULL;
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}
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iscsi_url = malloc(sizeof(struct iscsi_url));
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if (iscsi_url == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate iscsi_url structure");
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free(str);
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return NULL;
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}
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memset(iscsi_url, 0, sizeof(struct iscsi_url));
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iscsi_url->portal = strdup(portal);
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if (iscsi_url->portal == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup portal string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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iscsi_url->target = strdup(target);
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if (iscsi_url->target == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup target string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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if (user != NULL && passwd != NULL) {
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iscsi_url->user = strdup(user);
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if (iscsi_url->user == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup username string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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iscsi_url->passwd = strdup(passwd);
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if (iscsi_url->passwd == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup password string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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}
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iscsi_url->lun = l;
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free(str);
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return iscsi_url;
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}
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struct iscsi_url *
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iscsi_parse_portal_url(struct iscsi_context *iscsi, const char *url)
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{
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struct iscsi_url *iscsi_url;
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char *str;
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char *portal;
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char *user = NULL;
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char *passwd = NULL;
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char *tmp;
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if (strncmp(url, "iscsi://", 8)) {
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iscsi_set_error(iscsi, "Invalid URL %s\niSCSI Portal URL must be of "
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"the form: %s",
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url,
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ISCSI_PURL_SYNTAX);
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return NULL;
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}
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str = strdup(url + 8);
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if (str == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup url %s", url);
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return NULL;
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}
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portal = str;
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user = getenv("LIBISCSI_CHAP_USERNAME");
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passwd = getenv("LIBISCSI_CHAP_PASSWORD");
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tmp = index(portal, '@');
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if (tmp != NULL) {
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user = portal;
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*tmp++ = 0;
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portal = tmp;
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tmp = index(user, '%');
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if (tmp != NULL) {
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*tmp++ = 0;
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passwd = tmp;
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}
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}
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iscsi_url = malloc(sizeof(struct iscsi_url));
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if (iscsi_url == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to allocate iscsi_url structure");
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free(str);
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return NULL;
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}
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memset(iscsi_url, 0, sizeof(struct iscsi_url));
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iscsi_url->portal = strdup(portal);
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if (iscsi_url->portal == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup portal string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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if (user != NULL && passwd != NULL) {
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iscsi_url->user = strdup(user);
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if (iscsi_url->user == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup username string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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iscsi_url->passwd = strdup(passwd);
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if (iscsi_url->passwd == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: Failed to strdup password string");
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iscsi_destroy_url(iscsi_url);
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free(str);
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return NULL;
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}
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}
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free(str);
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return iscsi_url;
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}
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void
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iscsi_destroy_url(struct iscsi_url *iscsi_url)
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{
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if (iscsi_url == NULL) {
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return;
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}
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free(discard_const(iscsi_url->portal));
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free(discard_const(iscsi_url->target));
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free(discard_const(iscsi_url->user));
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free(discard_const(iscsi_url->passwd));
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free(iscsi_url);
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}
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int
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iscsi_set_initiator_username_pwd(struct iscsi_context *iscsi,
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const char *user,
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const char *passwd)
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{
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free(discard_const(iscsi->user));
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iscsi->user = strdup(user);
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if (iscsi->user == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to strdup username");
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return -1;
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}
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free(discard_const(iscsi->passwd));
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iscsi->passwd = strdup(passwd);
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if (iscsi->passwd == NULL) {
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iscsi_set_error(iscsi, "Out-of-memory: failed to strdup password");
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return -1;
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}
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return 0;
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}
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