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Add iscsi-readcapacity16 binary

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This patch adds a small binary to read the size of an iscsi target. The value
is returned on stdout.
This commit is contained in:
Peter Lieven
2012-10-23 15:59:28 +02:00
parent 56b1e27980
commit fec061ac68
3 changed files with 169 additions and 2 deletions
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3
Makefile.am
View File

@@ -37,9 +37,10 @@ lib_libiscsi_la_LDFLAGS = \
# libiscsi utilities
if PROGRAMS
bin_PROGRAMS += bin/iscsi-inq bin/iscsi-ls
bin_PROGRAMS += bin/iscsi-inq bin/iscsi-ls bin/iscsi-readcapacity16
bin_iscsi_inq_SOURCES = src/iscsi-inq.c
bin_iscsi_ls_SOURCES = src/iscsi-ls.c
bin_iscsi_readcapacity16_SOURCES = src/iscsi-readcapacity16.c
# Other examples

2
include/iscsi.h
View File

@@ -963,7 +963,7 @@ iscsi_scsi_cancel_all_tasks(struct iscsi_context *iscsi);
do { \
if ((iscsi)->debug >= level) { \
fprintf(stderr,"libiscsi: "); \
fprintf(stderr, (fmt), ##args); \
fprintf(stderr, (fmt), ##args); \
if (iscsi->target_name) { \
fprintf(stderr," [%s]",iscsi->target_name); \
} \

166
src/iscsi-readcapacity16.c Normal file
View File

@@ -0,0 +1,166 @@
/*
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 2 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 <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <string.h>
#include <poll.h>
#include <popt.h>
#include "iscsi.h"
#include "scsi-lowlevel.h"
const char *initiator = "iqn.2007-10.com.github:sahlberg:libiscsi:iscsi-readcapacity16";
void print_usage(void)
{
fprintf(stderr, "Usage: iscsi-readcapacity16 [-?] [-?|--help] [--usage] [-i|--initiator-name=iqn-name] <iscsi-url>\n");
}
void print_help(void)
{
fprintf(stderr, "Usage: iscsi_readcapacity16 [OPTION...] <iscsi-url>\n");
fprintf(stderr, " -i, --initiator-name=iqn-name Initiatorname to use\n");
fprintf(stderr, " -d, --debug=integer debug level (0=disabled)\n");
fprintf(stderr, "\n");
fprintf(stderr, "Help options:\n");
fprintf(stderr, " -?, --help Show this help message\n");
fprintf(stderr, " --usage Display brief usage message\n");
fprintf(stderr, "\n");
fprintf(stderr, "iSCSI URL format : %s\n", ISCSI_URL_SYNTAX);
fprintf(stderr, "\n");
fprintf(stderr, "<host> is either of:\n");
fprintf(stderr, " \"hostname\" iscsi.example\n");
fprintf(stderr, " \"ipv4-address\" 10.1.1.27\n");
fprintf(stderr, " \"ipv6-address\" [fce0::1]\n");
}
int main(int argc, const char *argv[])
{
poptContext pc;
struct iscsi_context *iscsi;
const char **extra_argv;
int extra_argc = 0;
const char *url = NULL;
struct iscsi_url *iscsi_url = NULL;
int show_help = 0, show_usage = 0, debug = 0;
int res;
struct poptOption popt_options[] = {
{ "help", '?', POPT_ARG_NONE, &show_help, 0, "Show this help message", NULL },
{ "usage", 0, POPT_ARG_NONE, &show_usage, 0, "Display brief usage message", NULL },
{ "initiator-name", 'i', POPT_ARG_STRING, &initiator, 0, "Initiatorname to use", "iqn-name" },
{ "debug", 'd', POPT_ARG_INT, &debug, 0, "Debugging level", "integer" },
POPT_TABLEEND
};
pc = poptGetContext(argv[0], argc, argv, popt_options, POPT_CONTEXT_POSIXMEHARDER);
if ((res = poptGetNextOpt(pc)) < -1) {
fprintf(stderr, "Failed to parse option : %s %s\n",
poptBadOption(pc, 0), poptStrerror(res));
exit(10);
}
extra_argv = poptGetArgs(pc);
if (extra_argv) {
url = *extra_argv;
extra_argv++;
while (extra_argv[extra_argc]) {
extra_argc++;
}
}
if (show_help != 0) {
print_help();
exit(0);
}
if (show_usage != 0) {
print_usage();
exit(0);
}
poptFreeContext(pc);
iscsi = iscsi_create_context(initiator);
if (iscsi == NULL) {
fprintf(stderr, "Failed to create context\n");
exit(10);
}
if (debug > 0) {
iscsi_set_debug(iscsi, debug);
}
if (url == NULL) {
fprintf(stderr, "You must specify the URL\n");
print_usage();
exit(10);
}
iscsi_url = iscsi_parse_full_url(iscsi, url);
if (iscsi_url == NULL) {
fprintf(stderr, "Failed to parse URL: %s\n",
iscsi_get_error(iscsi));
exit(10);
}
iscsi_set_targetname(iscsi, iscsi_url->target);
iscsi_set_session_type(iscsi, ISCSI_SESSION_NORMAL);
iscsi_set_header_digest(iscsi, ISCSI_HEADER_DIGEST_NONE_CRC32C);
if (iscsi_url->user != NULL) {
if (iscsi_set_initiator_username_pwd(iscsi, iscsi_url->user, iscsi_url->passwd) != 0) {
fprintf(stderr, "Failed to set initiator username and password\n");
exit(10);
}
}
if (iscsi_full_connect_sync(iscsi, iscsi_url->portal, iscsi_url->lun) != 0) {
fprintf(stderr, "Login Failed. %s\n", iscsi_get_error(iscsi));
iscsi_destroy_url(iscsi_url);
iscsi_destroy_context(iscsi);
exit(10);
}
struct scsi_task *task;
struct scsi_readcapacity16 *rc16;
task = iscsi_readcapacity16_sync(iscsi, iscsi_url->lun);
if (task == NULL || task->status != SCSI_STATUS_GOOD) {
fprintf(stderr,"failed to send readcapacity command\n");
iscsi_destroy_url(iscsi_url);
iscsi_destroy_context(iscsi);
exit(10);
}
rc16 = scsi_datain_unmarshall(task);
if (rc16 == NULL) {
fprintf(stderr,"failed to unmarshall readcapacity16 data\n");
scsi_free_scsi_task(task);
iscsi_destroy_url(iscsi_url);
iscsi_destroy_context(iscsi);
exit(10);
}
fprintf(stdout,"%lu",rc16->block_length*(rc16->returned_lba + 1));
iscsi_destroy_url(iscsi_url);
iscsi_logout_sync(iscsi);
iscsi_destroy_context(iscsi);
return 0;
}