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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 General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program; if not, see <http://www.gnu.org/licenses/>.
*/
#include "config.h"
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <arpa/inet.h>
#include "iscsi.h"
#include "iscsi-private.h"
int iscsi_discovery_async(struct iscsi_context *iscsi, iscsi_command_cb cb, void *private_data)
{
struct iscsi_pdu *pdu;
const char *str;
if (iscsi == NULL) {
printf("trying to send text on NULL context\n");
return -1;
}
if (iscsi->session_type != ISCSI_SESSION_DISCOVERY) {
printf("Trying to do discovery on non-discovery session\n");
return -2;
}
pdu = iscsi_allocate_pdu(iscsi, ISCSI_PDU_TEXT_REQUEST, ISCSI_PDU_TEXT_RESPONSE);
if (pdu == NULL) {
printf("Failed to allocate text pdu\n");
return -3;
}
/* immediate */
iscsi_pdu_set_immediate(pdu);
/* flags */
iscsi_pdu_set_pduflags(pdu, ISCSI_PDU_TEXT_FINAL);
/* target transfer tag */
iscsi_pdu_set_ttt(pdu, 0xffffffff);
/* sendtargets */
str = "SendTargets=All";
if (iscsi_pdu_add_data(iscsi, pdu, (unsigned char *)str, strlen(str)+1) != 0) {
printf("pdu add data failed\n");
iscsi_free_pdu(iscsi, pdu);
return -4;
}
pdu->callback = cb;
pdu->private_data = private_data;
if (iscsi_queue_pdu(iscsi, pdu) != 0) {
printf("failed to queue iscsi text pdu\n");
iscsi_free_pdu(iscsi, pdu);
return -5;
}
return 0;
}
static void iscsi_free_discovery_addresses(struct iscsi_discovery_address *addresses)
{
while (addresses != NULL) {
struct iscsi_discovery_address *next = addresses->next;
if (addresses->target_name != NULL) {
free(discard_const(addresses->target_name));
addresses->target_name = NULL;
}
if (addresses->target_address != NULL) {
free(discard_const(addresses->target_address));
addresses->target_address = NULL;
}
addresses->next = NULL;
free(addresses);
addresses = next;
}
}
int iscsi_process_text_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu, const unsigned char *hdr, int size)
{
struct iscsi_discovery_address *targets = NULL;
/* verify the response looks sane */
if (hdr[1] != ISCSI_PDU_TEXT_FINAL) {
printf("unsupported flags in text reply %02x\n", hdr[1]);
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
return -1;
}
/* skip past the header */
hdr += ISCSI_HEADER_SIZE;
size -= ISCSI_HEADER_SIZE;
while (size > 0) {
int len;
len = strlen((char *)hdr);
if (len == 0) {
break;
}
if (len > size) {
printf("len > size when parsing discovery data %d>%d\n", len, size);
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
iscsi_free_discovery_addresses(targets);
return -1;
}
/* parse the strings */
if (!strncmp((char *)hdr, "TargetName=", 11)) {
struct iscsi_discovery_address *target;
target = malloc(sizeof(struct iscsi_discovery_address));
if (target == NULL) {
printf("Failed to allocate data for new discovered target\n");
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
iscsi_free_discovery_addresses(targets);
return -1;
}
bzero(target, sizeof(struct iscsi_discovery_address));
target->target_name = strdup((char *)hdr+11);
if (target->target_name == NULL) {
printf("Failed to allocate data for new discovered target name\n");
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
free(target);
target = NULL;
iscsi_free_discovery_addresses(targets);
return -1;
}
target->next = targets;
targets = target;
} else if (!strncmp((char *)hdr, "TargetAddress=", 14)) {
targets->target_address = strdup((char *)hdr+14);
if (targets->target_address == NULL) {
printf("Failed to allocate data for new discovered target address\n");
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
iscsi_free_discovery_addresses(targets);
return -1;
}
} else {
printf("Don't know how to handle discovery string : %s\n", hdr);
pdu->callback(iscsi, ISCSI_STATUS_ERROR, NULL, pdu->private_data);
iscsi_free_discovery_addresses(targets);
return -1;
}
hdr += len + 1;
size -= len + 1;
}
pdu->callback(iscsi, ISCSI_STATUS_GOOD, targets, pdu->private_data);
iscsi_free_discovery_addresses(targets);
return 0;
}
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