X-Git-Url: http://git.ozlabs.org/?a=blobdiff_plain;f=ccan%2Fiscsi%2Fdiscovery.c;fp=ccan%2Fiscsi%2Fdiscovery.c;h=05250429b4e8e6e652ea02a51a9196ae0f52ce2a;hb=cb522f25cada0d3429c69d0fbaa5bd337a422cdd;hp=0000000000000000000000000000000000000000;hpb=0473813acdfad62221ec9f2b9b41bc10d1f4586d;p=ccan

diff --git a/ccan/iscsi/discovery.c b/ccan/iscsi/discovery.c
new file mode 100644
index 00000000..05250429
--- /dev/null
+++ b/ccan/iscsi/discovery.c
@@ -0,0 +1,172 @@
+/* 
+   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/>.
+*/
+
+#define _GNU_SOURCE
+#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;
+	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("Dont 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;
+}