Implement SCSI commands in Linux.

2025-12-16 19:24:37 +00:00 · 2019-10-16 21:53:06 +01:00
parent 71954fd9fa
commit d170083f77
5 changed files with 145 additions and 3 deletions
--- a/linux/scsi.c
+++ b/linux/scsi.c
@@ -0,0 +1,76 @@
+/*
+ * This file is part of the DiscImageChef Remote Server.
+ * Copyright (c) 2019 Natalia Portillo.
+ *
+ * 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, version 3.
+ *
+ * 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 "../dicmote.h"
+
+#include <malloc.h>
+#include <scsi/sg.h>
+#include <stdint.h>
+#include <string.h>
+#include <sys/ioctl.h>
+
+int32_t linux_send_scsi_command(int       device_fd,
+                                char*     cdb,
+                                char*     buffer,
+                                char**    senseBuffer,
+                                uint32_t  timeout,
+                                int32_t   direction,
+                                uint32_t* duration,
+                                uint32_t* sense,
+                                uint32_t  cdb_len,
+                                uint32_t* buf_len,
+                                uint32_t* sense_len)
+{
+    sg_io_hdr_t hdr;
+    int         dir, ret;
+    *sense_len = 32;
+
+    memset(&hdr, 0, sizeof(sg_io_hdr_t));
+    *senseBuffer = malloc(*sense_len);
+
+    if(!*senseBuffer) return -1;
+
+    switch(direction)
+    {
+        case DICMOTE_SCSI_DIRECTION_IN: dir = SG_DXFER_FROM_DEV; break;
+        case DICMOTE_SCSI_DIRECTION_OUT: dir = SG_DXFER_TO_DEV; break;
+        case DICMOTE_SCSI_DIRECTION_INOUT: dir = SG_DXFER_TO_FROM_DEV; break;
+        case DICMOTE_SCSI_DIRECTION_NONE:
+        case DICMOTE_SCSI_DIRECTION_UNSPECIFIED:
+        default: dir = SG_DXFER_NONE; break;
+    }
+
+    hdr.interface_id    = 'S';
+    hdr.cmd_len         = (char)cdb_len;
+    hdr.mx_sb_len       = 32;
+    hdr.dxfer_direction = dir;
+    hdr.dxfer_len       = *buf_len;
+    hdr.dxferp          = buffer;
+    hdr.cmdp            = (unsigned char*)cdb;
+    hdr.sbp             = (unsigned char*)*senseBuffer;
+    hdr.timeout         = timeout;
+    hdr.flags           = SG_FLAG_DIRECT_IO;
+
+    ret = ioctl(device_fd, SG_IO, &hdr);
+
+    *sense |= (hdr.info & SG_INFO_OK_MASK) != SG_INFO_OK;
+    // TODO: Manual timing if duration is 0
+    *duration  = hdr.duration;
+    *sense_len = hdr.sb_len_wr;
+
+    return ret; // TODO: Implement
+}