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| 1 | // Copyright 2015 Matthew Holt and The Caddy Authors |
| 2 | // |
| 3 | // Licensed under the Apache License, Version 2.0 (the "License"); |
| 4 | // you may not use this file except in compliance with the License. |
| 5 | // You may obtain a copy of the License at |
| 6 | // |
| 7 | // http://www.apache.org/licenses/LICENSE-2.0 |
| 8 | // |
| 9 | // Unless required by applicable law or agreed to in writing, software |
| 10 | // distributed under the License is distributed on an "AS IS" BASIS, |
| 11 | // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 12 | // See the License for the specific language governing permissions and |
| 13 | // limitations under the License. |
| 14 | |
| 15 | package logging |
| 16 | |
| 17 | import ( |
| 18 | "encoding/json" |
| 19 | "fmt" |
| 20 | "io" |
| 21 | "math" |
| 22 | "os" |
| 23 | "path/filepath" |
| 24 | "strconv" |
| 25 | "strings" |
| 26 | "time" |
| 27 | |
| 28 | "github.com/DeRuina/timberjack" |
| 29 | "github.com/dustin/go-humanize" |
| 30 | |
| 31 | "github.com/caddyserver/caddy/v2" |
| 32 | "github.com/caddyserver/caddy/v2/caddyconfig/caddyfile" |
| 33 | ) |
| 34 | |
| 35 | func init() { |
| 36 | caddy.RegisterModule(FileWriter{}) |
| 37 | } |
| 38 | |
| 39 | // fileMode is a string made of 1 to 4 octal digits representing |
| 40 | // a numeric mode as specified with the `chmod` unix command. |
| 41 | // `"0777"` and `"777"` are thus equivalent values. |
| 42 | type fileMode os.FileMode |
| 43 | |
| 44 | // UnmarshalJSON satisfies json.Unmarshaler. |
| 45 | func (m *fileMode) UnmarshalJSON(b []byte) error { |
| 46 | if len(b) == 0 { |
| 47 | return io.EOF |
| 48 | } |
| 49 | |
| 50 | var s string |
| 51 | if err := json.Unmarshal(b, &s); err != nil { |
| 52 | return err |
| 53 | } |
| 54 | |
| 55 | mode, err := parseFileMode(s) |
| 56 | if err != nil { |
| 57 | return err |
| 58 | } |
| 59 | |
| 60 | *m = fileMode(mode) |
| 61 | return err |
| 62 | } |
| 63 | |
| 64 | // MarshalJSON satisfies json.Marshaler. |
| 65 | func (m *fileMode) MarshalJSON() ([]byte, error) { |
| 66 | return fmt.Appendf(nil, "\"%04o\"", *m), nil |
| 67 | } |
| 68 | |
| 69 | // parseFileMode parses a file mode string, |
| 70 | // adding support for `chmod` unix command like |
| 71 | // 1 to 4 digital octal values. |
| 72 | func parseFileMode(s string) (os.FileMode, error) { |
| 73 | modeStr := fmt.Sprintf("%04s", s) |
| 74 | mode, err := strconv.ParseUint(modeStr, 8, 32) |
| 75 | if err != nil { |
| 76 | return 0, err |
| 77 | } |
| 78 | return os.FileMode(mode), nil |
| 79 | } |
| 80 | |
| 81 | // FileWriter can write logs to files. By default, log files |
| 82 | // are rotated ("rolled") when they get large, and old log |
| 83 | // files get deleted, to ensure that the process does not |
| 84 | // exhaust disk space. |
| 85 | type FileWriter struct { |
| 86 | // Filename is the name of the file to write. |
| 87 | Filename string `json:"filename,omitempty"` |
| 88 | |
| 89 | // The file permissions mode. |
| 90 | // 0600 by default. |
| 91 | Mode fileMode `json:"mode,omitempty"` |
| 92 | |
| 93 | // DirMode controls permissions for any directories created to reach Filename. |
| 94 | // Default: 0700 (current behavior). |
| 95 | // |
| 96 | // Special values: |
| 97 | // - "inherit" → copy the nearest existing parent directory's perms (with r→x normalization) |
| 98 | // - "from_file" → derive from the file Mode (with r→x), e.g. 0644 → 0755, 0600 → 0700 |
| 99 | // Numeric octal strings (e.g. "0755") are also accepted. Subject to process umask. |
| 100 | DirMode string `json:"dir_mode,omitempty"` |
| 101 | |
| 102 | // Roll toggles log rolling or rotation, which is |
| 103 | // enabled by default. |
| 104 | Roll *bool `json:"roll,omitempty"` |
| 105 | |
| 106 | // When a log file reaches approximately this size, |
| 107 | // it will be rotated. |
| 108 | RollSizeMB int `json:"roll_size_mb,omitempty"` |
| 109 | |
| 110 | // Roll log file after some time |
| 111 | RollInterval caddy.Duration `json:"roll_interval,omitempty"` |
| 112 | |
| 113 | // Roll log file at fix minutes |
| 114 | // For example []int{0, 30} will roll file at xx:00 and xx:30 each hour |
| 115 | // Invalid value are ignored with a warning on stderr |
| 116 | // See https://github.com/DeRuina/timberjack#%EF%B8%8F-rotation-notes--warnings for caveats |
| 117 | RollAtMinutes []int `json:"roll_minutes,omitempty"` |
| 118 | |
| 119 | // Roll log file at fix time |
| 120 | // For example []string{"00:00", "12:00"} will roll file at 00:00 and 12:00 each day |
| 121 | // Invalid value are ignored with a warning on stderr |
| 122 | // See https://github.com/DeRuina/timberjack#%EF%B8%8F-rotation-notes--warnings for caveats |
| 123 | RollAt []string `json:"roll_at,omitempty"` |
| 124 | |
| 125 | // Whether to compress rolled files. |
| 126 | // Default: true. |
| 127 | // Deprecated: Use RollCompression instead, setting it to "none". |
| 128 | RollCompress *bool `json:"roll_gzip,omitempty"` |
| 129 | |
| 130 | // RollCompression selects the compression algorithm for rolled files. |
| 131 | // Accepted values: "none", "gzip", "zstd". |
| 132 | // Default: gzip |
| 133 | RollCompression string `json:"roll_compression,omitempty"` |
| 134 | |
| 135 | // Whether to use local timestamps in rolled filenames. |
| 136 | // Default: false |
| 137 | RollLocalTime bool `json:"roll_local_time,omitempty"` |
| 138 | |
| 139 | // The maximum number of rolled log files to keep. |
| 140 | // Default: 10 |
| 141 | RollKeep int `json:"roll_keep,omitempty"` |
| 142 | |
| 143 | // How many days to keep rolled log files. Default: 90 |
| 144 | RollKeepDays int `json:"roll_keep_days,omitempty"` |
| 145 | |
| 146 | // Rotated file will have format <logfilename>-<format>-<criterion>.log |
| 147 | // Optional. If unset or invalid, defaults to 2006-01-02T15-04-05.000 (with fallback warning) |
| 148 | // <format> must be a Go time compatible format, see https://pkg.go.dev/time#pkg-constants |
| 149 | BackupTimeFormat string `json:"backup_time_format,omitempty"` |
| 150 | } |
| 151 | |
| 152 | // CaddyModule returns the Caddy module information. |
| 153 | func (FileWriter) CaddyModule() caddy.ModuleInfo { |
| 154 | return caddy.ModuleInfo{ |
| 155 | ID: "caddy.logging.writers.file", |
| 156 | New: func() caddy.Module { return new(FileWriter) }, |
| 157 | } |
| 158 | } |
| 159 | |
| 160 | // Provision sets up the module |
| 161 | func (fw *FileWriter) Provision(ctx caddy.Context) error { |
| 162 | // Replace placeholder in filename |
| 163 | repl := caddy.NewReplacer() |
| 164 | filename, err := repl.ReplaceOrErr(fw.Filename, true, true) |
| 165 | if err != nil { |
| 166 | return fmt.Errorf("invalid filename for log file: %v", err) |
| 167 | } |
| 168 | |
| 169 | fw.Filename = filename |
| 170 | return nil |
| 171 | } |
| 172 | |
| 173 | func (fw FileWriter) String() string { |
| 174 | fpath, err := caddy.FastAbs(fw.Filename) |
| 175 | if err == nil { |
| 176 | return fpath |
| 177 | } |
| 178 | return fw.Filename |
| 179 | } |
| 180 | |
| 181 | // WriterKey returns a unique key representing this fw. |
| 182 | func (fw FileWriter) WriterKey() string { |
| 183 | return "file:" + fw.Filename |
| 184 | } |
| 185 | |
| 186 | // OpenWriter opens a new file writer. |
| 187 | func (fw FileWriter) OpenWriter() (io.WriteCloser, error) { |
| 188 | modeIfCreating := os.FileMode(fw.Mode) |
| 189 | if modeIfCreating == 0 { |
| 190 | modeIfCreating = 0o600 |
| 191 | } |
| 192 | |
| 193 | // roll log files as a sensible default to avoid disk space exhaustion |
| 194 | roll := fw.Roll == nil || *fw.Roll |
| 195 | |
| 196 | // Ensure directory exists before opening the file. |
| 197 | dirPath := filepath.Dir(fw.Filename) |
| 198 | switch strings.ToLower(strings.TrimSpace(fw.DirMode)) { |
| 199 | case "", "0": |
| 200 | // Preserve current behavior: locked-down directories by default. |
| 201 | if err := os.MkdirAll(dirPath, 0o700); err != nil { |
| 202 | return nil, err |
| 203 | } |
| 204 | case "inherit": |
| 205 | if err := mkdirAllInherit(dirPath); err != nil { |
| 206 | return nil, err |
| 207 | } |
| 208 | case "from_file": |
| 209 | if err := mkdirAllFromFile(dirPath, modeIfCreating); err != nil { |
| 210 | return nil, err |
| 211 | } |
| 212 | default: |
| 213 | dm, err := parseFileMode(fw.DirMode) |
| 214 | if err != nil { |
| 215 | return nil, fmt.Errorf("dir_mode: %w", err) |
| 216 | } |
| 217 | if err := os.MkdirAll(dirPath, dm); err != nil { |
| 218 | return nil, err |
| 219 | } |
| 220 | } |
| 221 | |
| 222 | // create/open the file |
| 223 | file, err := os.OpenFile(fw.Filename, os.O_WRONLY|os.O_APPEND|os.O_CREATE, modeIfCreating) |
| 224 | if err != nil { |
| 225 | return nil, err |
| 226 | } |
| 227 | closeFile := true |
| 228 | defer func() { |
| 229 | if closeFile { |
| 230 | _ = file.Close() |
| 231 | } |
| 232 | }() |
| 233 | info, err := file.Stat() |
| 234 | if roll { |
| 235 | _ = file.Close() // timberjack will reopen it on its own |
| 236 | closeFile = false |
| 237 | } |
| 238 | |
| 239 | // Ensure already existing files have the right mode, since OpenFile will not set the mode in such case. |
| 240 | if configuredMode := os.FileMode(fw.Mode); configuredMode != 0 { |
| 241 | if err != nil { |
| 242 | return nil, fmt.Errorf("unable to stat log file to see if we need to set permissions: %v", err) |
| 243 | } |
| 244 | // only chmod if the configured mode is different |
| 245 | if info.Mode()&os.ModePerm != configuredMode&os.ModePerm { |
| 246 | if err = os.Chmod(fw.Filename, configuredMode); err != nil { |
| 247 | return nil, err |
| 248 | } |
| 249 | } |
| 250 | } |
| 251 | |
| 252 | // if not rolling, then the plain file handle is all we need |
| 253 | if !roll { |
| 254 | closeFile = false |
| 255 | return file, nil |
| 256 | } |
| 257 | |
| 258 | // otherwise, return a rolling log |
| 259 | if fw.RollSizeMB == 0 { |
| 260 | fw.RollSizeMB = 100 |
| 261 | } |
| 262 | if fw.RollCompress == nil { |
| 263 | compress := true |
| 264 | fw.RollCompress = &compress |
| 265 | } |
| 266 | if fw.RollKeep == 0 { |
| 267 | fw.RollKeep = 10 |
| 268 | } |
| 269 | if fw.RollKeepDays == 0 { |
| 270 | fw.RollKeepDays = 90 |
| 271 | } |
| 272 | |
| 273 | // Determine compression algorithm to use. Priority: |
| 274 | // 1) explicit RollCompression (none|gzip|zstd) |
| 275 | // 2) if RollCompress is unset or true -> gzip |
| 276 | // 3) if RollCompress is false -> none |
| 277 | var compression string |
| 278 | if fw.RollCompression != "" { |
| 279 | compression = strings.ToLower(strings.TrimSpace(fw.RollCompression)) |
| 280 | if compression != "none" && compression != "gzip" && compression != "zstd" { |
| 281 | return nil, fmt.Errorf("invalid roll_compression: %s", fw.RollCompression) |
| 282 | } |
| 283 | } else { |
| 284 | if fw.RollCompress == nil || *fw.RollCompress { |
| 285 | compression = "gzip" |
| 286 | } else { |
| 287 | compression = "none" |
| 288 | } |
| 289 | } |
| 290 | |
| 291 | return &timberjack.Logger{ |
| 292 | Filename: fw.Filename, |
| 293 | MaxSize: fw.RollSizeMB, |
| 294 | MaxAge: fw.RollKeepDays, |
| 295 | MaxBackups: fw.RollKeep, |
| 296 | LocalTime: fw.RollLocalTime, |
| 297 | Compression: compression, |
| 298 | RotationInterval: time.Duration(fw.RollInterval), |
| 299 | RotateAtMinutes: fw.RollAtMinutes, |
| 300 | RotateAt: fw.RollAt, |
| 301 | BackupTimeFormat: fw.BackupTimeFormat, |
| 302 | FileMode: os.FileMode(fw.Mode), |
| 303 | }, nil |
| 304 | } |
| 305 | |
| 306 | // normalizeDirPerm ensures that read bits also have execute bits set. |
| 307 | func normalizeDirPerm(p os.FileMode) os.FileMode { |
| 308 | if p&0o400 != 0 { |
| 309 | p |= 0o100 |
| 310 | } |
| 311 | if p&0o040 != 0 { |
| 312 | p |= 0o010 |
| 313 | } |
| 314 | if p&0o004 != 0 { |
| 315 | p |= 0o001 |
| 316 | } |
| 317 | return p |
| 318 | } |
| 319 | |
| 320 | // mkdirAllInherit creates missing dirs using the nearest existing parent's |
| 321 | // permissions, normalized with r→x. |
| 322 | func mkdirAllInherit(dir string) error { |
| 323 | if fi, err := os.Stat(dir); err == nil && fi.IsDir() { |
| 324 | return nil |
| 325 | } |
| 326 | cur := dir |
| 327 | var parent string |
| 328 | for { |
| 329 | next := filepath.Dir(cur) |
| 330 | if next == cur { |
| 331 | parent = next |
| 332 | break |
| 333 | } |
| 334 | if fi, err := os.Stat(next); err == nil { |
| 335 | if !fi.IsDir() { |
| 336 | return fmt.Errorf("path component %s exists and is not a directory", next) |
| 337 | } |
| 338 | parent = next |
| 339 | break |
| 340 | } |
| 341 | cur = next |
| 342 | } |
| 343 | perm := os.FileMode(0o700) |
| 344 | if fi, err := os.Stat(parent); err == nil && fi.IsDir() { |
| 345 | perm = fi.Mode().Perm() |
| 346 | } |
| 347 | perm = normalizeDirPerm(perm) |
| 348 | return os.MkdirAll(dir, perm) |
| 349 | } |
| 350 | |
| 351 | // mkdirAllFromFile creates missing dirs using the file's mode (with r→x) so |
| 352 | // 0644 → 0755, 0600 → 0700, etc. |
| 353 | func mkdirAllFromFile(dir string, fileMode os.FileMode) error { |
| 354 | if fi, err := os.Stat(dir); err == nil && fi.IsDir() { |
| 355 | return nil |
| 356 | } |
| 357 | perm := normalizeDirPerm(fileMode.Perm()) | 0o200 // ensure owner write on dir so files can be created |
| 358 | return os.MkdirAll(dir, perm) |
| 359 | } |
| 360 | |
| 361 | // UnmarshalCaddyfile sets up the module from Caddyfile tokens. Syntax: |
| 362 | // |
| 363 | // file <filename> { |
| 364 | // mode <mode> |
| 365 | // dir_mode <mode|inherit|from_file> |
| 366 | // roll_disabled |
| 367 | // roll_size <size> |
| 368 | // roll_uncompressed |
| 369 | // roll_compression <none|gzip|zstd> |
| 370 | // roll_local_time |
| 371 | // roll_keep <num> |
| 372 | // roll_keep_for <days> |
| 373 | // } |
| 374 | // |
| 375 | // The roll_size value has megabyte resolution. |
| 376 | // Fractional values are rounded up to the next whole megabyte (MiB). |
| 377 | // |
| 378 | // By default, compression is enabled, but can be turned off by setting |
| 379 | // the roll_uncompressed option. |
| 380 | // |
| 381 | // The roll_keep_for duration has day resolution. |
| 382 | // Fractional values are rounded up to the next whole number of days. |
| 383 | // |
| 384 | // If any of the mode, roll_size, roll_keep, or roll_keep_for subdirectives are |
| 385 | // omitted or set to a zero value, then Caddy's default value for that |
| 386 | // subdirective is used. |
| 387 | func (fw *FileWriter) UnmarshalCaddyfile(d *caddyfile.Dispenser) error { |
| 388 | d.Next() // consume writer name |
| 389 | if !d.NextArg() { |
| 390 | return d.ArgErr() |
| 391 | } |
| 392 | fw.Filename = d.Val() |
| 393 | if d.NextArg() { |
| 394 | return d.ArgErr() |
| 395 | } |
| 396 | |
| 397 | for d.NextBlock(0) { |
| 398 | switch d.Val() { |
| 399 | case "mode": |
| 400 | var modeStr string |
| 401 | if !d.AllArgs(&modeStr) { |
| 402 | return d.ArgErr() |
| 403 | } |
| 404 | mode, err := parseFileMode(modeStr) |
| 405 | if err != nil { |
| 406 | return d.Errf("parsing mode: %v", err) |
| 407 | } |
| 408 | fw.Mode = fileMode(mode) |
| 409 | |
| 410 | case "dir_mode": |
| 411 | var val string |
| 412 | if !d.AllArgs(&val) { |
| 413 | return d.ArgErr() |
| 414 | } |
| 415 | val = strings.TrimSpace(val) |
| 416 | switch strings.ToLower(val) { |
| 417 | case "inherit", "from_file": |
| 418 | fw.DirMode = val |
| 419 | default: |
| 420 | if _, err := parseFileMode(val); err != nil { |
| 421 | return d.Errf("parsing dir_mode: %v", err) |
| 422 | } |
| 423 | fw.DirMode = val |
| 424 | } |
| 425 | |
| 426 | case "roll_disabled": |
| 427 | var f bool |
| 428 | fw.Roll = &f |
| 429 | if d.NextArg() { |
| 430 | return d.ArgErr() |
| 431 | } |
| 432 | |
| 433 | case "roll_size": |
| 434 | var sizeStr string |
| 435 | if !d.AllArgs(&sizeStr) { |
| 436 | return d.ArgErr() |
| 437 | } |
| 438 | size, err := humanize.ParseBytes(sizeStr) |
| 439 | if err != nil { |
| 440 | return d.Errf("parsing size: %v", err) |
| 441 | } |
| 442 | fw.RollSizeMB = int(math.Ceil(float64(size) / humanize.MiByte)) |
| 443 | |
| 444 | case "roll_uncompressed": |
| 445 | var f bool |
| 446 | fw.RollCompress = &f |
| 447 | if d.NextArg() { |
| 448 | return d.ArgErr() |
| 449 | } |
| 450 | |
| 451 | case "roll_compression": |
| 452 | var comp string |
| 453 | if !d.AllArgs(&comp) { |
| 454 | return d.ArgErr() |
| 455 | } |
| 456 | comp = strings.ToLower(strings.TrimSpace(comp)) |
| 457 | switch comp { |
| 458 | case "none", "gzip", "zstd": |
| 459 | fw.RollCompression = comp |
| 460 | default: |
| 461 | return d.Errf("parsing roll_compression: must be 'none', 'gzip' or 'zstd'") |
| 462 | } |
| 463 | |
| 464 | case "roll_local_time": |
| 465 | fw.RollLocalTime = true |
| 466 | if d.NextArg() { |
| 467 | return d.ArgErr() |
| 468 | } |
| 469 | |
| 470 | case "roll_keep": |
| 471 | var keepStr string |
| 472 | if !d.AllArgs(&keepStr) { |
| 473 | return d.ArgErr() |
| 474 | } |
| 475 | keep, err := strconv.Atoi(keepStr) |
| 476 | if err != nil { |
| 477 | return d.Errf("parsing roll_keep number: %v", err) |
| 478 | } |
| 479 | fw.RollKeep = keep |
| 480 | |
| 481 | case "roll_keep_for": |
| 482 | var keepForStr string |
| 483 | if !d.AllArgs(&keepForStr) { |
| 484 | return d.ArgErr() |
| 485 | } |
| 486 | keepFor, err := caddy.ParseDuration(keepForStr) |
| 487 | if err != nil { |
| 488 | return d.Errf("parsing roll_keep_for duration: %v", err) |
| 489 | } |
| 490 | if keepFor < 0 { |
| 491 | return d.Errf("negative roll_keep_for duration: %v", keepFor) |
| 492 | } |
| 493 | fw.RollKeepDays = int(math.Ceil(keepFor.Hours() / 24)) |
| 494 | |
| 495 | case "roll_interval": |
| 496 | var durationStr string |
| 497 | if !d.AllArgs(&durationStr) { |
| 498 | return d.ArgErr() |
| 499 | } |
| 500 | duration, err := caddy.ParseDuration(durationStr) |
| 501 | if err != nil { |
| 502 | return d.Errf("parsing roll_interval duration: %v", err) |
| 503 | } |
| 504 | fw.RollInterval = caddy.Duration(duration) |
| 505 | |
| 506 | case "roll_minutes": |
| 507 | // Accept either a single comma-separated argument or |
| 508 | // multiple space-separated arguments. Collect all |
| 509 | // remaining args on the line and split on commas. |
| 510 | args := d.RemainingArgs() |
| 511 | if len(args) == 0 { |
| 512 | return d.ArgErr() |
| 513 | } |
| 514 | var minutes []int |
| 515 | for _, arg := range args { |
| 516 | parts := strings.SplitSeq(arg, ",") |
| 517 | for p := range parts { |
| 518 | ms := strings.TrimSpace(p) |
| 519 | if ms == "" { |
| 520 | return d.Errf("parsing roll_minutes: empty value") |
| 521 | } |
| 522 | m, err := strconv.Atoi(ms) |
| 523 | if err != nil { |
| 524 | return d.Errf("parsing roll_minutes number: %v", err) |
| 525 | } |
| 526 | minutes = append(minutes, m) |
| 527 | } |
| 528 | } |
| 529 | fw.RollAtMinutes = minutes |
| 530 | |
| 531 | case "roll_at": |
| 532 | // Accept either a single comma-separated argument or |
| 533 | // multiple space-separated arguments. Collect all |
| 534 | // remaining args on the line and split on commas. |
| 535 | args := d.RemainingArgs() |
| 536 | if len(args) == 0 { |
| 537 | return d.ArgErr() |
| 538 | } |
| 539 | var times []string |
| 540 | for _, arg := range args { |
| 541 | parts := strings.SplitSeq(arg, ",") |
| 542 | for p := range parts { |
| 543 | ts := strings.TrimSpace(p) |
| 544 | if ts == "" { |
| 545 | return d.Errf("parsing roll_at: empty value") |
| 546 | } |
| 547 | times = append(times, ts) |
| 548 | } |
| 549 | } |
| 550 | fw.RollAt = times |
| 551 | |
| 552 | case "backup_time_format": |
| 553 | var format string |
| 554 | if !d.AllArgs(&format) { |
| 555 | return d.ArgErr() |
| 556 | } |
| 557 | fw.BackupTimeFormat = format |
| 558 | |
| 559 | default: |
| 560 | return d.Errf("unrecognized subdirective '%s'", d.Val()) |
| 561 | } |
| 562 | } |
| 563 | return nil |
| 564 | } |
| 565 | |
| 566 | // Interface guards |
| 567 | var ( |
| 568 | _ caddy.Provisioner = (*FileWriter)(nil) |
| 569 | _ caddy.WriterOpener = (*FileWriter)(nil) |
| 570 | _ caddyfile.Unmarshaler = (*FileWriter)(nil) |
| 571 | ) |