[PATCH 5/6] mgmt and concat_buf: concat_buf related changes throughout the code

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Use concat_buf in all functions producing output for management requests.
Using struct concat_buf and its associated concat_printf() variant
of snprintf(), replacing buffer_check() and _buffer_check() macros.
This spares explicit checkguards against buffer overflow, and by
explicit passing of concat_buf as the function argument allows
nested calls to functions which append more lines to the buffer.

Signed-off-by: Alexander Nezhinsky <alexandern@xxxxxxxxxxxx>
---
 usr/driver.c       |    2 +-
 usr/driver.h       |    2 +-
 usr/iscsi/iscsid.h |   14 +-----
 usr/iscsi/isns.c   |   22 ++++-----
 usr/iscsi/target.c |  126 ++++++++++++++++++----------------------------------
 usr/target.c       |   94 ++++++++++++++++-----------------------
 usr/tgtd.h         |    8 ++-
 7 files changed, 101 insertions(+), 167 deletions(-)

diff --git a/usr/driver.c b/usr/driver.c
index bf612b9..a564cf7 100644
--- a/usr/driver.c
+++ b/usr/driver.c
@@ -24,9 +24,9 @@
 #include <inttypes.h>
 
 #include "list.h"
+#include "util.h"
 #include "tgtd.h"
 #include "driver.h"
-#include "util.h"
 
 #define MAX_NR_DRIVERS	32
 
diff --git a/usr/driver.h b/usr/driver.h
index 091c3b0..b7e454c 100644
--- a/usr/driver.h
+++ b/usr/driver.h
@@ -24,7 +24,7 @@ struct tgt_driver {
 	int (*lu_create)(struct scsi_lu *);
 
 	int (*update)(int, int, int ,uint64_t, uint64_t, uint32_t, char *);
-	int (*show)(int, int, uint64_t, uint32_t, uint64_t, char *, int);
+	int (*show)(int, int, uint64_t, uint32_t, uint64_t, struct concat_buf *);
 
 	uint64_t (*scsi_get_lun)(uint8_t *);
 
diff --git a/usr/iscsi/iscsid.h b/usr/iscsi/iscsid.h
index c17ed13..4f37604 100644
--- a/usr/iscsi/iscsid.h
+++ b/usr/iscsi/iscsid.h
@@ -28,6 +28,7 @@
 #include "param.h"
 #include "log.h"
 #include "tgtd.h"
+#include "util.h"
 
 #include "iscsi_proto.h"
 #include "iscsi_if.h"
@@ -335,7 +336,7 @@ extern int iqn_acl(int tid, struct iscsi_connection *conn);
 extern int iscsi_target_create(struct target *);
 extern void iscsi_target_destroy(int tid, int force);
 extern int iscsi_target_show(int mode, int tid, uint64_t sid, uint32_t cid,
-			     uint64_t lun, char *buf, int rest);
+			     uint64_t lun, struct concat_buf *b);
 int iscsi_target_update(int mode, int op, int tid, uint64_t sid, uint64_t lun,
 			uint32_t cid, char *name);
 int target_redirected(struct iscsi_target *target,
@@ -351,19 +352,10 @@ extern void iscsi_exit(void);
 /* isns.c */
 extern int isns_init(void);
 extern void isns_exit(void);
-extern int isns_show(char *buf, int rest);
+extern int isns_show(struct concat_buf *b);
 extern int isns_update(char *params);
 extern int isns_scn_access(int tid, char *name);
 extern int isns_target_register(char *name);
 extern int isns_target_deregister(char *name);
 
-#define buffer_check(buf, total, len, rest)	\
-({						\
-	buf += len;				\
-	total += len;				\
-	rest -= len;				\
-	if (!rest)				\
-		break;				\
-})
-
 #endif	/* ISCSID_H */
diff --git a/usr/iscsi/isns.c b/usr/iscsi/isns.c
index 0afd251..1f1852c 100644
--- a/usr/iscsi/isns.c
+++ b/usr/iscsi/isns.c
@@ -1068,20 +1068,16 @@ void isns_exit(void)
 	free(rxbuf);
 }
 
-int isns_show(char *buf, int rest)
+int isns_show(struct concat_buf *b)
 {
-	int total = 0, max = rest;
-
-	shprintf(total, buf, rest, "iSNS:\n");
-	shprintf(total, buf, rest, _TAB1 "iSNS=%s\n",
-		 use_isns ? "On" : "Off");
-	shprintf(total, buf, rest, _TAB1 "iSNSServerIP=%s\n", isns_addr);
-	shprintf(total, buf, rest, _TAB1 "iSNSServerPort=%d\n", isns_port);
-	shprintf(total, buf, rest, _TAB1 "iSNSAccessControl=%s\n",
-		 use_isns_ac ? "On" : "Off");
-	return total;
-overflow:
-	return max;
+	concat_printf(b, "iSNS:\n");
+	concat_printf(b, _TAB1 "iSNS=%s\n", use_isns ? "On" : "Off");
+	concat_printf(b, _TAB1 "iSNSServerIP=%s\n", isns_addr);
+	concat_printf(b, _TAB1 "iSNSServerPort=%d\n", isns_port);
+	concat_printf(b, _TAB1 "iSNSAccessControl=%s\n",
+		      use_isns_ac ? "On" : "Off");
+
+	return TGTADM_SUCCESS;
 }
 
 enum {
diff --git a/usr/iscsi/target.c b/usr/iscsi/target.c
index 9546035..eb3afac 100644
--- a/usr/iscsi/target.c
+++ b/usr/iscsi/target.c
@@ -36,6 +36,7 @@
 #include "tgtadm.h"
 #include "tgtd.h"
 #include "target.h"
+#include "util.h"
 
 LIST_HEAD(iscsi_targets_list);
 
@@ -562,30 +563,20 @@ int iscsi_target_update(int mode, int op, int tid, uint64_t sid, uint64_t lun,
 	return err;
 }
 
-static int show_iscsi_param(char *buf, struct param *param, int rest)
+static int show_iscsi_param(struct param *param, struct concat_buf *b)
 {
-	int i, len, total;
-	char value[64];
 	struct iscsi_key *keys = session_keys;
+	int i;
+	char value[64];
 
-	for (i = total = 0; session_keys[i].name; i++) {
+	for (i = 0; session_keys[i].name; i++) {
 		param_val_to_str(keys, i, param[i].val, value);
-		len = snprintf(buf, rest, "%s=%s\n", keys[i].name, value);
-		buffer_check(buf, total, len, rest);
+		concat_printf(b, "%s=%s\n", keys[i].name, value);
 	}
 
-	return total;
+	return TGTADM_SUCCESS;
 }
 
-#define __buffer_check(buf, total, len, rest)	\
-({						\
-	buf += len;				\
-	total += len;				\
-	rest -= len;				\
-	if (!rest)				\
-		return total;			\
-})
-
 static struct iscsi_session *iscsi_target_find_session(
 	struct iscsi_target *target,
 	uint64_t sid)
@@ -602,26 +593,21 @@ static struct iscsi_session *iscsi_target_find_session(
 }
 
 static int iscsi_target_show_session(struct iscsi_target *target, uint64_t sid,
-				     char *buf, int rest)
+				     struct concat_buf *b)
 {
-	int len = 0, total = 0;
 	struct iscsi_session *session;
 
 	session = iscsi_target_find_session(target, sid);
 
-	if (session) {
-		len = show_iscsi_param(buf, session->session_param, rest);
-		__buffer_check(buf, total, len, rest);
-
-	}
+	if (session)
+		show_iscsi_param(session->session_param, b);
 
-	return total;
+	return TGTADM_SUCCESS;
 }
 
 static int iscsi_target_show_stats(struct iscsi_target *target, uint64_t sid,
-				   char *buf, int rest)
+				   struct concat_buf *b)
 {
-	int len = 0, total = 0;
 	struct iscsi_session *session;
 	struct iscsi_connection *conn;
 
@@ -629,8 +615,7 @@ static int iscsi_target_show_stats(struct iscsi_target *target, uint64_t sid,
 
 	if (session) {
 		list_for_each_entry(conn, &session->conn_list, clist) {
-			len = snprintf(buf, rest,
-				       "rxdata_octets: %" PRIu64 "\n"
+			concat_printf(b, "rxdata_octets: %" PRIu64 "\n"
 				       "txdata_octets: %" PRIu64 "\n"
 				       "dataout_pdus:  %d\n"
 				       "datain_pdus:   %d\n"
@@ -642,30 +627,27 @@ static int iscsi_target_show_stats(struct iscsi_target *target, uint64_t sid,
 				       conn->stats.datain_pdus,
 				       conn->stats.scsicmd_pdus,
 				       conn->stats.scsirsp_pdus);
-			__buffer_check(buf, total, len, rest);
 		}
 	}
 
-	return total;
+	return TGTADM_SUCCESS;
 
 }
 
 static int iscsi_target_show_connections(struct iscsi_target *target,
 					 uint64_t sid,
-					 char *buf, int rest)
+					 struct concat_buf *b)
 {
 	struct iscsi_session *session;
 	struct iscsi_connection *conn;
 	char addr[128];
-	int len = 0, total = 0;
 
 	list_for_each_entry(session, &target->sessions_list, slist) {
 		list_for_each_entry(conn, &session->conn_list, clist) {
 			memset(addr, 0, sizeof(addr));
 			conn->tp->ep_show(conn, addr, sizeof(addr));
 
-
-			len = snprintf(buf, rest, "Session: %u\n"
+			concat_printf(b, "Session: %u\n"
 				_TAB1 "Connection: %u\n"
 				_TAB2 "Initiator: %s\n"
 				_TAB2 "%s\n",
@@ -673,16 +655,14 @@ static int iscsi_target_show_connections(struct iscsi_target *target,
 				conn->cid,
 				session->initiator,
 				addr);
-			__buffer_check(buf, total, len, rest);
 		}
 	}
-	return total;
+	return TGTADM_SUCCESS;
 }
 
 static int iscsi_target_show_portals(struct iscsi_target *target, uint64_t sid,
-				   char *buf, int rest)
+				     struct concat_buf *b)
 {
-	int len = 0, total = 0;
 	struct iscsi_portal *portal;
 
 	list_for_each_entry(portal, &iscsi_portals_list,
@@ -690,57 +670,42 @@ static int iscsi_target_show_portals(struct iscsi_target *target, uint64_t sid,
 		int is_ipv6;
 
 		is_ipv6 = strchr(portal->addr, ':') != NULL;
-		len = snprintf(buf, rest,
-			       "Portal: %s%s%s:%d,%d\n",
+		concat_printf(b, "Portal: %s%s%s:%d,%d\n",
 			       is_ipv6 ? "[" : "",
 			       portal->addr,
 			       is_ipv6 ? "]" : "",
 			       portal->port ? portal->port : ISCSI_LISTEN_PORT,
 			       portal->tpgt);
-		__buffer_check(buf, total, len, rest);
 	}
 
-	return total;
-
+	return TGTADM_SUCCESS;
 }
 
-static int show_redirect_info(struct iscsi_target* target, char *buf, int rest)
+static int show_redirect_info(struct iscsi_target* target, struct concat_buf *b)
 {
-	int len, total = 0;
-
-	len = snprintf(buf, rest, "RedirectAddress=%s\n", target->redirect_info.addr);
-	__buffer_check(buf, total, len, rest);
-	len = snprintf(buf, rest, "RedirectPort=%s\n", target->redirect_info.port);
-	__buffer_check(buf, total, len, rest);
-	if (target->redirect_info.reason == ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP) {
-		len = snprintf(buf, rest, "RedirectReason=Temporary\n");
-		__buffer_check(buf, total, len, rest);
-	} else if (target->redirect_info.reason == ISCSI_LOGIN_STATUS_TGT_MOVED_PERM) {
-		len = snprintf(buf, rest, "RedirectReason=Permanent\n");
-		__buffer_check(buf, total, len, rest);
-	} else {
-		len = snprintf(buf, rest, "RedirectReason=Unknown\n");
-		__buffer_check(buf, total, len, rest);
-	}
+	concat_printf(b, "RedirectAddress=%s\n", target->redirect_info.addr);
+	concat_printf(b, "RedirectPort=%s\n", target->redirect_info.port);
+	if (target->redirect_info.reason == ISCSI_LOGIN_STATUS_TGT_MOVED_TEMP)
+		concat_printf(b, "RedirectReason=Temporary\n");
+	else if (target->redirect_info.reason == ISCSI_LOGIN_STATUS_TGT_MOVED_PERM)
+		concat_printf(b, "RedirectReason=Permanent\n");
+	else
+		concat_printf(b, "RedirectReason=Unknown\n");
 
-	return total;
+	return TGTADM_SUCCESS;
 }
 
-static int show_redirect_callback(struct iscsi_target *target, char *buf, int rest)
+static int show_redirect_callback(struct iscsi_target *target, struct concat_buf *b)
 {
-	int len, total = 0;
-
-	len = snprintf(buf, rest, "RedirectCallback=%s\n", target->redirect_info.callback);
-	__buffer_check(buf, total, len, rest);
+	concat_printf(b, "RedirectCallback=%s\n", target->redirect_info.callback);
 
-	return total;
+	return TGTADM_SUCCESS;
 }
 
 int iscsi_target_show(int mode, int tid, uint64_t sid, uint32_t cid, uint64_t lun,
-		      char *buf, int rest)
+		      struct concat_buf *b)
 {
 	struct iscsi_target* target = NULL;
-	int len, total = 0;
 
 	if (mode != MODE_SYSTEM && mode != MODE_PORTAL) {
 	    target = target_find_by_id(tid);
@@ -750,36 +715,31 @@ int iscsi_target_show(int mode, int tid, uint64_t sid, uint32_t cid, uint64_t lu
 
 	switch (mode) {
 	case MODE_SYSTEM:
-		total = isns_show(buf, rest);
+		isns_show(b);
 		break;
 	case MODE_TARGET:
 		if (target->redirect_info.callback)
-			len = show_redirect_callback(target, buf, rest);
+			show_redirect_callback(target, b);
 		else if (strlen(target->redirect_info.addr))
-			len = show_redirect_info(target, buf, rest);
+			show_redirect_info(target, b);
 		else
-			len = show_iscsi_param(buf, target->session_param, rest);
-		total += len;
+			show_iscsi_param(target->session_param, b);
 		break;
 	case MODE_SESSION:
-		len = iscsi_target_show_session(target, sid, buf, rest);
-		total += len;
+		iscsi_target_show_session(target, sid, b);
 		break;
 	case MODE_PORTAL:
-		len = iscsi_target_show_portals(target, sid, buf, rest);
-		total += len;
+		iscsi_target_show_portals(target, sid, b);
 		break;
 	case MODE_CONNECTION:
-		len = iscsi_target_show_connections(target, sid, buf, rest);
-		total += len;
+		iscsi_target_show_connections(target, sid, b);
 		break;
 	case MODE_STATS:
-		len = iscsi_target_show_stats(target, sid, buf, rest);
-		total += len;
+		iscsi_target_show_stats(target, sid, b);
 		break;
 	default:
 		break;
 	}
 
-	return total;
+	return TGTADM_SUCCESS;
 }
diff --git a/usr/target.c b/usr/target.c
index dd4b358..5d7aab1 100644
--- a/usr/target.c
+++ b/usr/target.c
@@ -1758,9 +1758,8 @@ static char *print_type(int type)
 	return name;
 }
 
-int tgt_target_show_all(char *buf, int rest)
+int tgt_target_show_all(struct concat_buf *b)
 {
-	int total = 0, max = rest;
 	char strflags[128];
 	struct target *target;
 	struct scsi_lu *lu;
@@ -1769,8 +1768,7 @@ int tgt_target_show_all(char *buf, int rest)
 	struct it_nexus *nexus;
 
 	list_for_each_entry(target, &target_list, target_siblings) {
-		shprintf(total, buf, rest,
-			 "Target %d: %s\n"
+		concat_printf(b, "Target %d: %s\n"
 			 _TAB1 "System information:\n"
 			 _TAB2 "Driver: %s\n"
 			 _TAB2 "State: %s\n",
@@ -1779,18 +1777,18 @@ int tgt_target_show_all(char *buf, int rest)
 			 tgt_drivers[target->lid]->name,
 			 target_state_name(target->target_state));
 
-		shprintf(total, buf, rest, _TAB1 "I_T nexus information:\n");
+		concat_printf(b, _TAB1 "I_T nexus information:\n");
 
 		list_for_each_entry(nexus, &target->it_nexus_list, nexus_siblings) {
-			shprintf(total, buf, rest, _TAB2 "I_T nexus: %" PRIu64 "\n",
-				 nexus->itn_id);
+			concat_printf(b, _TAB2 "I_T nexus: %" PRIu64 "\n",
+				      nexus->itn_id);
 			if (nexus->info)
-				shprintf(total, buf, rest, "%s", nexus->info);
+				concat_printf(b, "%s", nexus->info);
 		}
 
-		shprintf(total, buf, rest, _TAB1 "LUN information:\n");
+		concat_printf(b, _TAB1 "LUN information:\n");
 		list_for_each_entry(lu, &target->device_list, device_siblings)
-			shprintf(total, buf, rest,
+			concat_printf(b,
 				 _TAB2 "LUN: %" PRIu64 "\n"
   				 _TAB3 "Type: %s\n"
 				 _TAB3 "SCSI ID: %s\n"
@@ -1821,32 +1819,28 @@ int tgt_target_show_all(char *buf, int rest)
 		    !strcmp(tgt_drivers[target->lid]->name, "iser")) {
 			int i, aid;
 
-			shprintf(total, buf, rest, _TAB1
-				 "Account information:\n");
+			concat_printf(b, _TAB1 "Account information:\n");
 			for (i = 0; i < target->account.nr_inaccount; i++) {
 				aid = target->account.in_aids[i];
-				shprintf(total, buf, rest, _TAB2 "%s\n",
-					 __account_lookup_id(aid)->user);
+				concat_printf(b, _TAB2 "%s\n",
+					      __account_lookup_id(aid)->user);
 			}
 			if (target->account.out_aid) {
 				aid = target->account.out_aid;
-				shprintf(total, buf, rest,
-					 _TAB2 "%s (outgoing)\n",
+				concat_printf(b, _TAB2 "%s (outgoing)\n",
 					 __account_lookup_id(aid)->user);
 			}
 		}
 
-		shprintf(total, buf, rest, _TAB1 "ACL information:\n");
+		concat_printf(b, _TAB1 "ACL information:\n");
 		list_for_each_entry(acl, &target->acl_list, aclent_list)
-			shprintf(total, buf, rest, _TAB2 "%s\n", acl->address);
+			concat_printf(b, _TAB2 "%s\n", acl->address);
 
 		list_for_each_entry(iqn_acl, &target->iqn_acl_list, iqn_aclent_list)
-			shprintf(total, buf, rest, _TAB2 "%s\n", iqn_acl->name);
+			concat_printf(b, _TAB2 "%s\n", iqn_acl->name);
 
 	}
-	return total;
-overflow:
-	return max;
+	return TGTADM_SUCCESS;
 }
 
 char *tgt_targetname(int tid)
@@ -2048,20 +2042,17 @@ int tgt_portal_destroy(int lld, char *args)
 	return 0;
 }
 
-int account_show(char *buf, int rest)
+int account_show(struct concat_buf *b)
 {
-	int total = 0, max = rest;
 	struct account_entry *ac;
 
 	if (!list_empty(&account_list))
-		shprintf(total, buf, rest, "Account list:\n");
+		concat_printf(b, "Account list:\n");
 
 	list_for_each_entry(ac, &account_list, account_siblings)
-		shprintf(total, buf, rest, _TAB1 "%s\n", ac->user);
+		concat_printf(b, _TAB1 "%s\n", ac->user);
 
-	return total;
-overflow:
-	return max;
+	return TGTADM_SUCCESS;
 }
 
 static struct {
@@ -2102,9 +2093,8 @@ int system_set_state(char *str)
 	return err;
 }
 
-int system_show(int mode, char *buf, int rest)
+int system_show(int mode, struct concat_buf *b)
 {
-	int total = 0, max = rest;
 	struct backingstore_template *bst;
 	struct device_type_template *devt;
 	int i;
@@ -2114,51 +2104,45 @@ int system_show(int mode, char *buf, int rest)
 	if (mode != MODE_SYSTEM)
 		return 0;
 
-	shprintf(total, buf, rest, "System:\n");
-	shprintf(total, buf, rest, _TAB1 "State: %s\n",
-		 system_state_name(sys_state));
+	concat_printf(b, "System:\n");
+	concat_printf(b, _TAB1 "State: %s\n", system_state_name(sys_state));
+	concat_printf(b, _TAB1 "debug: %s\n", is_debug ? "on" : "off");
 
-	shprintf(total, buf, rest, "LLDs:\n");
+	concat_printf(b, "LLDs:\n");
 	for (i = 0; tgt_drivers[i]; i++) {
-		shprintf(total, buf, rest, _TAB1 "%s: %s\n",
-			 tgt_drivers[i]->name,
-			 driver_state_name(tgt_drivers[i]));
+		concat_printf(b, _TAB1 "%s: %s\n", tgt_drivers[i]->name,
+			      driver_state_name(tgt_drivers[i]));
 	}
 
-	shprintf(total, buf, rest, "Backing stores:\n");
+	concat_printf(b, "Backing stores:\n");
 	list_for_each_entry(bst, &bst_list, backingstore_siblings) {
 		if (!bst->bs_oflags_supported)
-			shprintf(total, buf, rest, _TAB1 "%s\n", bst->bs_name);
+			concat_printf(b, _TAB1 "%s\n", bst->bs_name);
 		else
-			shprintf(total, buf, rest, _TAB1 "%s (bsoflags %s)\n",
-				 bst->bs_name,
-				 open_flags_to_str(strflags, bst->bs_oflags_supported));
+			concat_printf(b, _TAB1 "%s (bsoflags %s)\n", bst->bs_name,
+				      open_flags_to_str(strflags, bst->bs_oflags_supported));
 	}
 
-	shprintf(total, buf, rest, "Device types:\n");
+	concat_printf(b, "Device types:\n");
 	list_for_each_entry(devt, &device_type_list, device_type_siblings)
-		shprintf(total, buf, rest, _TAB1 "%s\n", print_type(devt->type));
+		concat_printf(b, _TAB1 "%s\n", print_type(devt->type));
 
 	if (global_target.account.nr_inaccount) {
 		int i, aid;
-		shprintf(total, buf, rest,
-			 "Account information:\n");
+		concat_printf(b, _TAB1 "%s\n", "Account information:\n");
 		for (i = 0; i < global_target.account.nr_inaccount; i++) {
 			aid = global_target.account.in_aids[i];
-			shprintf(total, buf, rest, _TAB1 "%s\n",
-				 __account_lookup_id(aid)->user);
+			concat_printf(b, _TAB1 "%s\n",
+				      __account_lookup_id(aid)->user);
 		}
 		if (global_target.account.out_aid) {
 			aid = global_target.account.out_aid;
-			shprintf(total, buf, rest,
-				 _TAB1 "%s (outgoing)\n",
-				 __account_lookup_id(aid)->user);
+			concat_printf(b, _TAB1 "%s (outgoing)\n",
+				      __account_lookup_id(aid)->user);
 		}
 	}
 
-	return total;
-overflow:
-	return max;
+	return TGTADM_SUCCESS;
 }
 
 int is_system_available(void)
diff --git a/usr/tgtd.h b/usr/tgtd.h
index 1805f3e..c60957e 100644
--- a/usr/tgtd.h
+++ b/usr/tgtd.h
@@ -4,6 +4,8 @@
 #include "log.h"
 #include "scsi_cmnd.h"
 
+struct concat_buf;
+
 #define SCSI_ID_LEN		36
 #define SCSI_SN_LEN		36
 
@@ -230,9 +232,9 @@ extern int tgt_device_path_update(struct target *target, struct scsi_lu *lu, cha
 extern int tgt_target_create(int lld, int tid, char *args);
 extern int tgt_target_destroy(int lld, int tid, int force);
 extern char *tgt_targetname(int tid);
-extern int tgt_target_show_all(char *buf, int rest);
+extern int tgt_target_show_all(struct concat_buf *b);
 int system_set_state(char *str);
-int system_show(int mode, char *buf, int rest);
+int system_show(int mode, struct concat_buf *b);
 int is_system_available(void);
 int is_system_inactive(void);
 
@@ -301,7 +303,7 @@ extern int account_lookup(int tid, int type, char *user, int ulen, char *passwor
 extern int account_add(char *user, char *password);
 extern int account_del(char *user);
 extern int account_ctl(int tid, int type, char *user, int bind);
-extern int account_show(char *buf, int rest);
+extern int account_show(struct concat_buf *b);
 extern int account_available(int tid, int dir);
 
 extern int it_nexus_create(int tid, uint64_t itn_id, int host_no, char *info);
-- 
1.7.3.2

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