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feat: allow targetname redirect

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this patch adds an non-RFC extenstion to the redirect login response which allows
a target to temporarily redirect not only to a different target address but also to
a different targetname.

This is needed to allow scenarious in active/active storage clusters where each
node had its own targetname, but maps the same volumes behind equal LUN ids.

For this non-RFC behaviour the environment variable LIBISCSI_ALLLOW_TARGETNAME_REDIRECT
has to be set.

Signed-off-by: Peter Lieven <pl@dlhnet.de>
This commit is contained in:
Peter Lieven
2025-09-11 19:51:00 +00:00
parent 2b2529d196
commit 247133c9e2
2 changed files with 29 additions and 13 deletions
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1
include/iscsi-private.h
View File

@@ -112,6 +112,7 @@ struct iscsi_context {
char initiator_name[MAX_ISCSI_NAME_SIZE+1];
char target_name[MAX_ISCSI_NAME_SIZE+1];
char target_address[MAX_STRING_SIZE+1]; /* If a redirect */
char target_name2[MAX_ISCSI_NAME_SIZE+1]; /* If a redirect */
char connected_portal[MAX_STRING_SIZE+1];
char portal[MAX_STRING_SIZE+1];
char alias[MAX_STRING_SIZE+1];

19
lib/login.c
View File

@@ -117,11 +117,19 @@ iscsi_login_add_targetname(struct iscsi_context *iscsi, struct iscsi_pdu *pdu)
return -1;
}
if (iscsi->target_address[0] && iscsi->target_name2[0] &&
getenv("LIBISCSI_ALLOW_TARGETNAME_REDIRECT") != NULL) {
if (snprintf(str, MAX_STRING_SIZE, "TargetName=%s", iscsi->target_name2) == -1) {
iscsi_set_error(iscsi, "Out-of-memory: aprintf failed.");
return -1;
}
ISCSI_LOG(iscsi, 2, "rewriting TargetName to %s (non-RFC-compliant!)", iscsi->target_name2);
} else {
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.");
@@ -1330,6 +1338,10 @@ iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
strncpy(iscsi->target_address,ptr+14,MAX_STRING_SIZE);
}
if (!strncmp(ptr, "TargetName=", 11)) {
strncpy(iscsi->target_name2,ptr+11,MAX_ISCSI_NAME_SIZE);
}
if (!strncmp(ptr, "HeaderDigest=", 13)) {
if (!strcmp(ptr + 13, "CRC32C")) {
iscsi->want_header_digest
@@ -1486,7 +1498,10 @@ iscsi_process_login_reply(struct iscsi_context *iscsi, struct iscsi_pdu *pdu,
}
if (status == SCSI_STATUS_REDIRECT && iscsi->target_address[0]) {
ISCSI_LOG(iscsi, 2, "target requests redirect to %s",iscsi->target_address);
ISCSI_LOG(iscsi, 2, "target requests redirect to portal %s",iscsi->target_address);
if (iscsi->target_name2[0] && getenv("LIBISCSI_ALLOW_TARGETNAME_REDIRECT") != NULL) {
ISCSI_LOG(iscsi, 2, "target requests redirect to targetname %s (non-RFC-compliant!)",iscsi->target_name2);
}
if (pdu->callback) {
pdu->callback(iscsi, SCSI_STATUS_REDIRECT, NULL,
pdu->private_data);