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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,144 @@ | ||
//go:build linux | ||
// +build linux | ||
|
||
package checkups | ||
|
||
import ( | ||
"archive/zip" | ||
"context" | ||
"fmt" | ||
"io" | ||
"os" | ||
"path/filepath" | ||
"strings" | ||
|
||
"github.com/kolide/launcher/ee/agent" | ||
"github.com/kolide/launcher/ee/allowedcmd" | ||
) | ||
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||
type coredumpCheckup struct { | ||
status Status | ||
summary string | ||
data map[string]any | ||
} | ||
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func (c *coredumpCheckup) Name() string { | ||
return "Coredump Report" | ||
} | ||
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||
func (c *coredumpCheckup) Run(ctx context.Context, extraWriter io.Writer) error { | ||
c.data = make(map[string]any) | ||
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||
c.status = Passing | ||
for _, binaryName := range []string{"launcher", "osqueryd"} { | ||
coredumpListRaw, err := c.coredumpList(ctx, binaryName) | ||
if err != nil { | ||
c.summary += fmt.Sprintf("could not get coredump data for %s; ", binaryName) | ||
c.data[binaryName] = fmt.Sprintf("listing coredumps: %v", err) | ||
continue | ||
} | ||
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if coredumpListRaw == nil { | ||
c.summary += fmt.Sprintf("%s does not have any coredumps; ", binaryName) | ||
c.data[binaryName] = "N/A" | ||
continue | ||
} | ||
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// At least one coredump exists for at least one binary | ||
c.status = Warning | ||
c.summary += fmt.Sprintf("%s has at least one coredump; ", binaryName) | ||
c.data[binaryName] = strings.TrimSpace(string(coredumpListRaw)) | ||
} | ||
c.summary = strings.TrimSuffix(strings.TrimSpace(c.summary), ";") | ||
|
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if extraWriter == io.Discard || c.status == Passing { | ||
// Either not a flare, or we don't have any coredumps to grab info about | ||
return nil | ||
} | ||
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// Gather extra information about the coredumps | ||
extraZip := zip.NewWriter(extraWriter) | ||
defer extraZip.Close() | ||
for _, binaryName := range []string{"launcher", "osqueryd"} { | ||
if c.data[binaryName] == "N/A" { | ||
continue | ||
} | ||
if err := c.writeCoredumpInfo(ctx, binaryName, extraZip); err != nil { | ||
fmt.Fprintf(extraWriter, "Writing coredump info for %s: %v", binaryName, err) | ||
} | ||
} | ||
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return nil | ||
} | ||
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func (c *coredumpCheckup) coredumpList(ctx context.Context, binaryName string) ([]byte, error) { | ||
coredumpctlListCmd, err := allowedcmd.Coredumpctl(ctx, "--no-pager", "--no-legend", "--json=short", "list", binaryName) | ||
if err != nil { | ||
return nil, fmt.Errorf("could not create coredumpctl command: %w", err) | ||
} | ||
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out, err := coredumpctlListCmd.CombinedOutput() | ||
if strings.Contains(string(out), "No coredumps found") { | ||
return nil, nil | ||
} | ||
if err != nil { | ||
return nil, fmt.Errorf("running coredumpctl list %s: out `%s`; %w", binaryName, string(out), err) | ||
} | ||
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return out, nil | ||
} | ||
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func (c *coredumpCheckup) writeCoredumpInfo(ctx context.Context, binaryName string, z *zip.Writer) error { | ||
// Print info about all matching coredumps | ||
coredumpctlInfoCmd, err := allowedcmd.Coredumpctl(ctx, "--no-pager", "info", binaryName) | ||
if err != nil { | ||
return fmt.Errorf("could not create coredumpctl info command: %w", err) | ||
} | ||
infoOut, err := coredumpctlInfoCmd.CombinedOutput() | ||
if err != nil { | ||
return fmt.Errorf("running coredumpctl info %s: out `%s`; %w", binaryName, string(infoOut), err) | ||
} | ||
coredumpctlInfoFile, err := z.Create(filepath.Join(".", fmt.Sprintf("coredumpctl-info-%s.txt", binaryName))) | ||
if err != nil { | ||
return fmt.Errorf("creating coredumpctl-info.txt for %s in zip: %w", binaryName, err) | ||
} | ||
if _, err := coredumpctlInfoFile.Write(infoOut); err != nil { | ||
return fmt.Errorf("writing coredumpctl-info.txt in %s zip: %w", binaryName, err) | ||
} | ||
|
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// Now, try to get a coredump -- this will grab the most recent one | ||
tempDir, err := agent.MkdirTemp("coredump-flare") | ||
if err != nil { | ||
return fmt.Errorf("making temporary directory for coredump from %s: %w", binaryName, err) | ||
} | ||
defer os.RemoveAll(tempDir) | ||
tempDumpFile := filepath.Join(tempDir, fmt.Sprintf("coredump-%s.dump", binaryName)) | ||
coredumpctlDumpCmd, err := allowedcmd.Coredumpctl(ctx, "--no-pager", fmt.Sprintf("--output=%s", tempDumpFile), "dump", binaryName) | ||
if err != nil { | ||
return fmt.Errorf("could not create coredumpctl dump command: %w", err) | ||
} | ||
if err := coredumpctlDumpCmd.Run(); err != nil { | ||
return fmt.Errorf("running coredumpctl dump %s: %w", binaryName, err) | ||
} | ||
if err := addFileToZip(z, tempDumpFile); err != nil { | ||
return fmt.Errorf("adding coredumpctl dump %s output file to zip: %w", binaryName, err) | ||
} | ||
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return nil | ||
} | ||
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func (c *coredumpCheckup) ExtraFileName() string { | ||
return "coredumps.zip" | ||
} | ||
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func (c *coredumpCheckup) Status() Status { | ||
return c.status | ||
} | ||
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func (c *coredumpCheckup) Summary() string { | ||
return c.summary | ||
} | ||
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func (c *coredumpCheckup) Data() any { | ||
return c.data | ||
} |
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,36 @@ | ||
//go:build !linux | ||
// +build !linux | ||
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package checkups | ||
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import ( | ||
"context" | ||
"io" | ||
) | ||
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type coredumpCheckup struct { | ||
} | ||
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func (c *coredumpCheckup) Name() string { | ||
return "" | ||
} | ||
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func (c *coredumpCheckup) ExtraFileName() string { | ||
return "" | ||
} | ||
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func (c *coredumpCheckup) Run(_ context.Context, _ io.Writer) error { | ||
return nil | ||
} | ||
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func (c *coredumpCheckup) Status() Status { | ||
return Informational | ||
} | ||
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func (c *coredumpCheckup) Summary() string { | ||
return "" | ||
} | ||
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func (c *coredumpCheckup) Data() any { | ||
return nil | ||
} |
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