2 files changed, 129 insertions, 0 deletions
diff --git a/ioreplay/src/capture/capture.c b/ioreplay/src/capture/capture.c
new file mode 100644
index 0000000..0ac336b
--- /dev/null
+++ b/ioreplay/src/capture/capture.c
@@ -0,0 +1,99 @@
+// Copyright 2018 Mimecast Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#include "capture.h"
+
+#include <sys/utsname.h>
+
+status_e capture_run(options_s *opts)
+{
+    int status = 0;
+    struct utsname uts;
+
+    // To make it nicer we should iterate over PATH instead
+    char *staprun_paths[3] = {
+        "/usr/bin/staprun",
+        "/usr/local/bin/staprun",
+        "/bin/staprun"
+    };
+    int num_staprun_paths = 3;
+
+    if (0 != uname(&uts)) {
+        Errno("Could not identify release of currently running Kernel!");
+    }
+
+    Put("Release of currently running Kernel: %s", uts.release);
+    char modules_dir[128];
+    sprintf(modules_dir, "/opt/ioreplay/systemtap/%s", uts.release);
+    Put("Changing directory to module path: %s/", modules_dir);
+
+    if (0 != chdir(modules_dir)) {
+        Errno("Could not change into '%s', please ensure that the compiled "
+              "SystemTap modules correspond to the currently running Kernel "
+              "and that these are installed properly!\n",
+              modules_dir);
+    }
+
+    if (0 != access(opts->module, R_OK)) {
+        Errno("Module '%s/%s' can't be read, please make sure that the "
+              "SystemTap Kernel modules are installed!",
+              modules_dir, opts->module);
+    }
+
+    char *staprun_path = NULL;
+    for (int i = 0; i < num_staprun_paths; ++i) {
+        if (0 == access(staprun_paths[i], X_OK)) {
+            staprun_path = staprun_paths[i];
+            //Put("SystemTap command path: %s", staprun_path);
+            break;
+        }
+    }
+
+    if (staprun_path == NULL) {
+        Errno("Can't find 'staprun' command, please ensure to have the SystemTap "
+              "runtime (usually package 'systemtap-runtime') installed!");
+    }
+
+    char staprun_command[128];
+    if (opts->pid >= 0) {
+        sprintf(staprun_command, "%s %s -v -o %s -x %d", staprun_path, opts->module,
+                opts->capture_file, opts->pid);
+    } else {
+        sprintf(staprun_command, "%s %s -v -o %s", staprun_path, opts->module,
+                opts->capture_file);
+    }
+
+    Out("NOTICE: It is good practise first to stop all processes, then to ");
+    Out("start capturing, and then to start all processes again. The reason ");
+    Out("is that processes may have already open file handles. In that case ");
+    Out("I/O Replay would be unable to replay these! This may be improved "); 
+    Put("in a future release!");
+    Put("To abort capturing now send Ctrl+C, otherwise wait 1h");
+    Put("Capturing I/O via: '%s'", staprun_command);
+
+    char buf[1024];
+    FILE *fp;
+
+    if ((fp = popen(staprun_command, "r")) == NULL) {
+        Errno("Unable to invoke staprun command!");
+    }
+    while (fgets(buf, 1024, fp) != NULL)
+        Out("stapio: %s", buf);
+
+    if (0 != pclose(fp)) {
+        Error("Problems invoking staprun command!");
+    }
+
+    return status;
+}
diff --git a/ioreplay/src/capture/capture.h b/ioreplay/src/capture/capture.h
new file mode 100644
index 0000000..7718d3e
--- /dev/null
+++ b/ioreplay/src/capture/capture.h
@@ -0,0 +1,30 @@
+// Copyright 2018 Mimecast Ltd.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CAPTURE_H
+#define CAPTURE_H
+
+#include "../defaults.h"
+#include "../utils/futils.h"
+#include "../options.h"
+
+/**
+ * @brief Captures I/O to a .capture file by using stap from SystemTap
+ *
+ * @param opts The options object
+ * @return SUCCESS if everything went fine
+ */
+status_e capture_run(options_s *opts);
+
+#endif // CAPTURE_H