SCSI Target userland process example. Provides/Dumps the data related to

RECEIVE/SEND processor target requests to the "targ" sample target mode
driver.

2 files changed, 281 insertions, 0 deletions

diff --git a/share/examples/scsi_target/Makefile b/share/examples/scsi_target/Makefile
new file mode 100644
index 0000000..96582bb
--- /dev/null
+++ b/share/examples/scsi_target/Makefile
@@ -0,0 +1,8 @@
+#	$Id$
+
+PROG=	scsi_target
+SRCS=	scsi_target.c
+
+NOMAN=  noman
+
+.include <bsd.prog.mk>
diff --git a/share/examples/scsi_target/scsi_target.c b/share/examples/scsi_target/scsi_target.c
new file mode 100644
index 0000000..dab474b
--- /dev/null
+++ b/share/examples/scsi_target/scsi_target.c
@@ -0,0 +1,273 @@
+/*
+ * Sample program to attach to the "targ" processor target, target mode
+ * peripheral driver and push or receive data.
+ *
+ * Copyright (c) 1998 Justin T. Gibbs.
+ * All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions
+ * are met:
+ * 1. Redistributions of source code must retain the above copyright
+ *    notice, this list of conditions, and the following disclaimer,
+ *    without modification, immediately at the beginning of the file.
+ * 2. The name of the author may not be used to endorse or promote products
+ *    derived from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
+ * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
+ * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
+ * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE FOR
+ * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
+ * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
+ * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
+ * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
+ * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
+ * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
+ * SUCH DAMAGE.
+ *
+ *      $Id$
+ */
+
+#include <sys/types.h>
+
+#include <fcntl.h>
+#include <poll.h>
+#include <stddef.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <sysexits.h>
+#include <unistd.h>
+
+#include <cam/scsi/scsi_all.h>
+#include <cam/scsi/scsi_message.h>
+#include <cam/scsi/scsi_targetio.h>
+
+char  *appname;
+int    ifd;
+char  *ifilename;
+int    ofd;
+char  *ofilename;
+size_t bufsize = 64 * 1024;
+void  *buf;
+char  *targdevname;
+int    targfd;
+
+static void pump_events();
+static void handle_exception();
+static void usage();
+
+int
+main(int argc, char *argv[])
+{
+	int  ch;
+
+	appname = *argv;
+	while ((ch = getopt(argc, argv, "i:o:")) != -1) {
+		switch(ch) {
+		case 'i':
+			if ((ifd = open(optarg, O_RDONLY)) == -1) {
+				perror(optarg);
+				exit(EX_NOINPUT);
+			}
+			ifilename = optarg;
+			break;
+		case 'o':
+			if ((ofd = open(optarg,
+					O_WRONLY|O_CREAT), 0600) == -1) {
+				perror(optarg);
+				exit(EX_CANTCREAT);
+			}
+			ofilename = optarg;
+			break;
+		case '?':
+		default:
+			usage();
+			/* NOTREACHED */
+		}
+	}
+	argc -= optind;
+	argv += optind;
+
+	if (argc != 1) {
+		fprintf(stderr, "%s: No target device specifiled\n", appname);
+		usage();
+		/* NOTREACHED */
+	}
+
+	targdevname = *argv;
+	if ((targfd = open(targdevname, O_RDWR)) == -1) {
+		perror(targdevname);
+		exit(EX_NOINPUT);
+	}
+	
+	buf = malloc(bufsize);
+
+	if (buf == NULL) {
+		fprintf(stderr, "%s: Could not malloc I/O buffer", appname);
+		exit(EX_OSERR);
+	}
+
+	pump_events();
+
+	return (0);
+}
+
+static void
+pump_events()
+{
+	struct pollfd targpoll;
+
+	targpoll.fd = targfd;
+	targpoll.events = POLLRDNORM|POLLWRNORM;
+
+	while (1) {
+		int retval;
+
+		retval = poll(&targpoll, 1, INFTIM);
+
+		if (retval == -1) {
+			perror("Poll Failed");
+			exit(EX_SOFTWARE);
+		}
+
+		if (retval == 0) {
+			perror("Poll returned 0 although timeout infinite???");
+			exit(EX_SOFTWARE);
+		}
+
+		if (retval > 1) {
+			perror("Poll returned more fds ready than allocated");
+			exit(EX_SOFTWARE);
+		}
+
+		/* Process events */
+		if ((targpoll.revents & POLLERR) != 0) {
+			handle_exception();
+		}
+
+		if ((targpoll.revents & POLLRDNORM) != 0) {
+			printf("Read Poll event came true\n");
+			retval = read(targfd, buf, bufsize);
+
+			if (retval == -1) {
+				perror("Read from targ failed");
+			} else {
+				retval = write(ofd, buf, retval);
+				if (retval == -1) {
+					perror("Write to file failed");
+				}
+			}
+		}
+
+		if ((targpoll.revents & POLLWRNORM) != 0) {
+			int amount_read;
+
+			printf("Write Poll event came true\n");
+			retval = read(ifd, buf, bufsize);
+			if (retval == -1) {
+				perror("Read from file failed");
+				exit(EX_SOFTWARE);
+			}
+
+			amount_read = retval;
+			retval = write(targfd, buf, retval);
+			if (retval == -1) {
+				perror("Write to targ failed");
+				retval = 0;
+			}
+
+			/* Backup in our input stream on short writes */
+			if (retval != amount_read)
+				lseek(ifd, retval - amount_read, SEEK_CUR);
+		}
+	}
+}
+
+static void
+handle_exception()
+{
+	targ_exception exceptions;
+
+	if (ioctl(targfd, TARGIOCFETCHEXCEPTION, &exceptions) == -1) {
+		perror("TARGIOCFETCHEXCEPTION");
+		exit(EX_SOFTWARE);
+	}
+
+	if ((exceptions & TARG_EXCEPT_DEVICE_INVALID) != 0) {
+		/* Device went away.  Nothing more to do. */
+		exit(0);
+	}
+
+	if ((exceptions & TARG_EXCEPT_UNKNOWN_ATIO) != 0) {
+		struct ccb_accept_tio atio;
+		struct ioc_initiator_state ioc_istate;
+		struct scsi_sense_data *sense;
+		union  ccb ccb;
+
+		if (ioctl(targfd, TARGIOCFETCHATIO, &atio) == -1) {
+			perror("TARGIOCFETCHATIO");
+			exit(EX_SOFTWARE);
+		}
+
+		printf("Ignoring unhandled command 0x%x for Id %d\n",
+		       atio.cdb_io.cdb_bytes[0], atio.init_id);
+
+		ioc_istate.initiator_id = atio.init_id;
+		if (ioctl(targfd, TARGIOCGETISTATE, &ioc_istate) == -1) {
+			perror("TARGIOCGETISTATE");
+			exit(EX_SOFTWARE);
+		}
+
+		/* Send back Illegal Command code status */
+		ioc_istate.istate.pending_ca |= CA_CMD_SENSE;
+		sense = &ioc_istate.istate.sense_data;
+		bzero(sense, sizeof(*sense));
+		sense->error_code = SSD_CURRENT_ERROR;     
+		sense->flags = SSD_KEY_ILLEGAL_REQUEST;
+		sense->add_sense_code = 0x20;    
+		sense->add_sense_code_qual = 0x00;
+		sense->extra_len = offsetof(struct scsi_sense_data, fru)
+				 - offsetof(struct scsi_sense_data, extra_len);
+
+		if (ioctl(targfd, TARGIOCSETISTATE, &ioc_istate) == -1) {
+			perror("TARGIOCSETISTATE");
+			exit(EX_SOFTWARE);
+		}
+
+		bzero(&ccb, sizeof(ccb));
+		cam_fill_ctio(&ccb.csio, /*retries*/2,
+			      /*cbfcnp*/NULL,
+			      /*flags*/CAM_DIR_NONE
+			     | (atio.ccb_h.flags & CAM_TAG_ACTION_VALID)
+			     | CAM_SEND_STATUS,
+                              /*tag_action*/MSG_SIMPLE_Q_TAG,
+			      atio.tag_id,
+			      atio.init_id,
+			      SCSI_STATUS_CHECK_COND,
+			      /*data_ptr*/NULL,
+			      /*dxfer_len*/0,
+			      /*timeout*/5 * 1000);
+		if (ioctl(targfd, TARGIOCCOMMAND, &ccb) == -1) {
+			perror("TARGIOCCOMMAND");
+			exit(EX_SOFTWARE);
+		}
+		
+	}
+
+	if (ioctl(targfd, TARGIOCCLEAREXCEPTION, &exceptions) == -1) {
+		perror("TARGIOCCLEAREXCEPTION");
+		exit(EX_SOFTWARE);
+	}
+}
+
+static void
+usage()
+{
+
+	(void)fprintf(stderr,
+"usage: %-16s [-o output_file] [-i input_file] /dev/targ?\n", appname);
+
+	exit(EX_USAGE);
+}
+