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// 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;
}
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