| 1 |
/* |
| 2 |
librc-daemon |
| 3 |
Finds PID for given daemon criteria |
| 4 |
Copyright 2007 Gentoo Foundation |
| 5 |
Released under the GPLv2 |
| 6 |
*/ |
| 7 |
|
| 8 |
#include "librc.h" |
| 9 |
|
| 10 |
#if defined(__linux__) |
| 11 |
static bool pid_is_cmd (pid_t pid, const char *cmd) |
| 12 |
{ |
| 13 |
char buffer[32]; |
| 14 |
FILE *fp; |
| 15 |
int c; |
| 16 |
|
| 17 |
snprintf(buffer, sizeof (buffer), "/proc/%d/stat", pid); |
| 18 |
if ((fp = fopen (buffer, "r")) == NULL) |
| 19 |
return (false); |
| 20 |
|
| 21 |
while ((c = getc (fp)) != EOF && c != '(') |
| 22 |
; |
| 23 |
|
| 24 |
if (c != '(') { |
| 25 |
fclose(fp); |
| 26 |
return (false); |
| 27 |
} |
| 28 |
|
| 29 |
while ((c = getc (fp)) != EOF && c == *cmd) |
| 30 |
cmd++; |
| 31 |
|
| 32 |
fclose (fp); |
| 33 |
|
| 34 |
return ((c == ')' && *cmd == '\0') ? true : false); |
| 35 |
} |
| 36 |
|
| 37 |
static bool pid_is_exec (pid_t pid, const char *exec) |
| 38 |
{ |
| 39 |
char cmdline[32]; |
| 40 |
char buffer[PATH_MAX]; |
| 41 |
char *p; |
| 42 |
int fd = -1; |
| 43 |
int r; |
| 44 |
|
| 45 |
snprintf (cmdline, sizeof (cmdline), "/proc/%u/exe", pid); |
| 46 |
memset (buffer, 0, sizeof (buffer)); |
| 47 |
if (readlink (cmdline, buffer, sizeof (buffer)) != -1) { |
| 48 |
if (strcmp (exec, buffer) == 0) |
| 49 |
return (true); |
| 50 |
|
| 51 |
/* We should cater for deleted binaries too */ |
| 52 |
if (strlen (buffer) > 10) { |
| 53 |
p = buffer + (strlen (buffer) - 10); |
| 54 |
if (strcmp (p, " (deleted)") == 0) { |
| 55 |
*p = 0; |
| 56 |
if (strcmp (buffer, exec) == 0) |
| 57 |
return (true); |
| 58 |
} |
| 59 |
} |
| 60 |
} |
| 61 |
|
| 62 |
snprintf (cmdline, sizeof (cmdline), "/proc/%u/cmdline", pid); |
| 63 |
if ((fd = open (cmdline, O_RDONLY)) < 0) |
| 64 |
return (false); |
| 65 |
|
| 66 |
r = read(fd, buffer, sizeof (buffer)); |
| 67 |
close (fd); |
| 68 |
|
| 69 |
if (r == -1) |
| 70 |
return 0; |
| 71 |
|
| 72 |
buffer[r] = 0; |
| 73 |
return (strcmp (exec, buffer) == 0 ? true : false); |
| 74 |
} |
| 75 |
|
| 76 |
pid_t *rc_find_pids (const char *exec, const char *cmd, |
| 77 |
uid_t uid, pid_t pid) |
| 78 |
{ |
| 79 |
DIR *procdir; |
| 80 |
struct dirent *entry; |
| 81 |
int npids = 0; |
| 82 |
int foundany = false; |
| 83 |
pid_t p; |
| 84 |
pid_t *pids = NULL; |
| 85 |
char buffer[PATH_MAX]; |
| 86 |
struct stat sb; |
| 87 |
pid_t runscript_pid = 0; |
| 88 |
char *pp; |
| 89 |
|
| 90 |
if ((procdir = opendir ("/proc")) == NULL) |
| 91 |
eerrorx ("opendir `/proc': %s", strerror (errno)); |
| 92 |
|
| 93 |
/* |
| 94 |
We never match RC_RUNSCRIPT_PID if present so we avoid the below |
| 95 |
scenario |
| 96 |
|
| 97 |
/etc/init.d/ntpd stop does |
| 98 |
start-stop-daemon --stop --name ntpd |
| 99 |
catching /etc/init.d/ntpd stop |
| 100 |
|
| 101 |
nasty |
| 102 |
*/ |
| 103 |
|
| 104 |
if ((pp = getenv ("RC_RUNSCRIPT_PID"))) { |
| 105 |
if (sscanf (pp, "%d", &runscript_pid) != 1) |
| 106 |
runscript_pid = 0; |
| 107 |
} |
| 108 |
|
| 109 |
while ((entry = readdir (procdir)) != NULL) { |
| 110 |
if (sscanf (entry->d_name, "%d", &p) != 1) |
| 111 |
continue; |
| 112 |
foundany = true; |
| 113 |
|
| 114 |
if (runscript_pid != 0 && runscript_pid == p) |
| 115 |
continue; |
| 116 |
|
| 117 |
if (pid != 0 && pid != p) |
| 118 |
continue; |
| 119 |
|
| 120 |
if (uid) { |
| 121 |
snprintf (buffer, sizeof (buffer), "/proc/%d", pid); |
| 122 |
if (stat (buffer, &sb) != 0 || sb.st_uid != uid) |
| 123 |
continue; |
| 124 |
} |
| 125 |
|
| 126 |
if (cmd && ! pid_is_cmd (p, cmd)) |
| 127 |
continue; |
| 128 |
|
| 129 |
if (exec && ! cmd && ! pid_is_exec (p, exec)) |
| 130 |
continue; |
| 131 |
|
| 132 |
pids = realloc (pids, sizeof (pid_t) * (npids + 2)); |
| 133 |
if (! pids) |
| 134 |
eerrorx ("memory exhausted"); |
| 135 |
|
| 136 |
pids[npids] = p; |
| 137 |
pids[npids + 1] = 0; |
| 138 |
npids++; |
| 139 |
} |
| 140 |
closedir (procdir); |
| 141 |
|
| 142 |
if (! foundany) |
| 143 |
eerrorx ("nothing in /proc"); |
| 144 |
|
| 145 |
return (pids); |
| 146 |
} |
| 147 |
librc_hidden_def(rc_find_pids) |
| 148 |
|
| 149 |
#elif defined(__DragonFly__) || defined(__FreeBSD__) || \ |
| 150 |
defined(__NetBSD__) || defined(__OpenBSD__) |
| 151 |
|
| 152 |
# if defined(__DragonFly__) || defined(__FreeBSD__) |
| 153 |
# ifndef KERN_PROC_PROC |
| 154 |
# define KERN_PROC_PROC KERN_PROC_ALL |
| 155 |
# endif |
| 156 |
# define _KINFO_PROC kinfo_proc |
| 157 |
# define _KVM_GETARGV kvm_getargv |
| 158 |
# define _GET_KINFO_UID(kp) (kp.ki_ruid) |
| 159 |
# define _GET_KINFO_COMM(kp) (kp.ki_comm) |
| 160 |
# define _GET_KINFO_PID(kp) (kp.ki_pid) |
| 161 |
# else |
| 162 |
# define _KINFO_PROC kinfo_proc2 |
| 163 |
# define _KVM_GETARGV kvm_getargv2 |
| 164 |
# define _GET_KINFO_UID(kp) (kp.p_ruid) |
| 165 |
# define _GET_KINFO_COMM(kp) (kp.p_comm) |
| 166 |
# define _GET_KINFO_PID(kp) (kp.p_pid) |
| 167 |
# endif |
| 168 |
|
| 169 |
pid_t *rc_find_pids (const char *exec, const char *cmd, |
| 170 |
uid_t uid, pid_t pid) |
| 171 |
{ |
| 172 |
static kvm_t *kd = NULL; |
| 173 |
char errbuf[_POSIX2_LINE_MAX]; |
| 174 |
struct _KINFO_PROC *kp; |
| 175 |
int i; |
| 176 |
int processes = 0; |
| 177 |
int argc = 0; |
| 178 |
char **argv; |
| 179 |
pid_t *pids = NULL; |
| 180 |
int npids = 0; |
| 181 |
|
| 182 |
if ((kd = kvm_openfiles (NULL, NULL, NULL, O_RDONLY, errbuf)) == NULL) |
| 183 |
eerrorx ("kvm_open: %s", errbuf); |
| 184 |
|
| 185 |
#if defined(__DragonFly__) || defined( __FreeBSD__) |
| 186 |
kp = kvm_getprocs (kd, KERN_PROC_PROC, 0, &processes); |
| 187 |
#else |
| 188 |
kp = kvm_getproc2 (kd, KERN_PROC_ALL, 0, sizeof(struct kinfo_proc2), |
| 189 |
&processes); |
| 190 |
#endif |
| 191 |
for (i = 0; i < processes; i++) { |
| 192 |
pid_t p = _GET_KINFO_PID (kp[i]); |
| 193 |
if (pid != 0 && pid != p) |
| 194 |
continue; |
| 195 |
|
| 196 |
if (uid != 0 && uid != _GET_KINFO_UID (kp[i])) |
| 197 |
continue; |
| 198 |
|
| 199 |
if (cmd) { |
| 200 |
if (! _GET_KINFO_COMM (kp[i]) || |
| 201 |
strcmp (cmd, _GET_KINFO_COMM (kp[i])) != 0) |
| 202 |
continue; |
| 203 |
} |
| 204 |
|
| 205 |
if (exec && ! cmd) { |
| 206 |
if ((argv = _KVM_GETARGV (kd, &kp[i], argc)) == NULL || ! *argv) |
| 207 |
continue; |
| 208 |
|
| 209 |
if (strcmp (*argv, exec) != 0) |
| 210 |
continue; |
| 211 |
} |
| 212 |
|
| 213 |
pids = realloc (pids, sizeof (pid_t) * (npids + 2)); |
| 214 |
if (! pids) |
| 215 |
eerrorx ("memory exhausted"); |
| 216 |
|
| 217 |
pids[npids] = p; |
| 218 |
pids[npids + 1] = 0; |
| 219 |
npids++; |
| 220 |
} |
| 221 |
kvm_close(kd); |
| 222 |
|
| 223 |
return (pids); |
| 224 |
} |
| 225 |
librc_hidden_def(rc_find_pids) |
| 226 |
|
| 227 |
#else |
| 228 |
# error "Platform not supported!" |
| 229 |
#endif |
| 230 |
|
| 231 |
static bool _match_daemon (const char *path, const char *file, |
| 232 |
const char *mexec, const char *mname, |
| 233 |
const char *mpidfile) |
| 234 |
{ |
| 235 |
char buffer[RC_LINEBUFFER]; |
| 236 |
char *ffile = rc_strcatpaths (path, file, (char *) NULL); |
| 237 |
FILE *fp; |
| 238 |
int lc = 0; |
| 239 |
int m = 0; |
| 240 |
|
| 241 |
if (! rc_exists (ffile)) { |
| 242 |
free (ffile); |
| 243 |
return (false); |
| 244 |
} |
| 245 |
|
| 246 |
if ((fp = fopen (ffile, "r")) == NULL) { |
| 247 |
eerror ("fopen `%s': %s", ffile, strerror (errno)); |
| 248 |
free (ffile); |
| 249 |
return (false); |
| 250 |
} |
| 251 |
|
| 252 |
if (! mname) |
| 253 |
m += 10; |
| 254 |
if (! mpidfile) |
| 255 |
m += 100; |
| 256 |
|
| 257 |
memset (buffer, 0, sizeof (buffer)); |
| 258 |
while ((fgets (buffer, RC_LINEBUFFER, fp))) { |
| 259 |
int lb = strlen (buffer) - 1; |
| 260 |
if (buffer[lb] == '\n') |
| 261 |
buffer[lb] = 0; |
| 262 |
|
| 263 |
if (strcmp (buffer, mexec) == 0) |
| 264 |
m += 1; |
| 265 |
else if (mname && strcmp (buffer, mname) == 0) |
| 266 |
m += 10; |
| 267 |
else if (mpidfile && strcmp (buffer, mpidfile) == 0) |
| 268 |
m += 100; |
| 269 |
|
| 270 |
if (m == 111) |
| 271 |
break; |
| 272 |
|
| 273 |
lc++; |
| 274 |
if (lc > 5) |
| 275 |
break; |
| 276 |
} |
| 277 |
fclose (fp); |
| 278 |
free (ffile); |
| 279 |
|
| 280 |
return (m == 111 ? true : false); |
| 281 |
} |
| 282 |
|
| 283 |
void rc_set_service_daemon (const char *service, const char *exec, |
| 284 |
const char *name, const char *pidfile, |
| 285 |
bool started) |
| 286 |
{ |
| 287 |
char *svc = rc_xstrdup (service); |
| 288 |
char *dirpath = rc_strcatpaths (RC_SVCDIR, "daemons", basename (svc), |
| 289 |
(char *) NULL); |
| 290 |
char **files = NULL; |
| 291 |
char *file; |
| 292 |
char *ffile = NULL; |
| 293 |
int i; |
| 294 |
char *mexec; |
| 295 |
char *mname; |
| 296 |
char *mpidfile; |
| 297 |
int nfiles = 0; |
| 298 |
|
| 299 |
free (svc); |
| 300 |
if (! exec && ! name && ! pidfile) |
| 301 |
return; |
| 302 |
|
| 303 |
if (exec) { |
| 304 |
i = strlen (exec) + 6; |
| 305 |
mexec = rc_xmalloc (sizeof (char *) * i); |
| 306 |
snprintf (mexec, i, "exec=%s", exec); |
| 307 |
} else |
| 308 |
mexec = rc_xstrdup ("exec="); |
| 309 |
|
| 310 |
if (name) { |
| 311 |
i = strlen (name) + 6; |
| 312 |
mname = rc_xmalloc (sizeof (char *) * i); |
| 313 |
snprintf (mname, i, "name=%s", name); |
| 314 |
} else |
| 315 |
mname = rc_xstrdup ("name="); |
| 316 |
|
| 317 |
if (pidfile) { |
| 318 |
i = strlen (pidfile) + 9; |
| 319 |
mpidfile = rc_xmalloc (sizeof (char *) * i); |
| 320 |
snprintf (mpidfile, i, "pidfile=%s", pidfile); |
| 321 |
} else |
| 322 |
mpidfile = rc_xstrdup ("pidfile="); |
| 323 |
|
| 324 |
/* Regardless, erase any existing daemon info */ |
| 325 |
if (rc_is_dir (dirpath)) { |
| 326 |
char *oldfile = NULL; |
| 327 |
files = rc_ls_dir (NULL, dirpath, 0); |
| 328 |
STRLIST_FOREACH (files, file, i) { |
| 329 |
ffile = rc_strcatpaths (dirpath, file, (char *) NULL); |
| 330 |
nfiles++; |
| 331 |
|
| 332 |
if (! oldfile) { |
| 333 |
if (_match_daemon (dirpath, file, mexec, mname, mpidfile)) { |
| 334 |
unlink (ffile); |
| 335 |
oldfile = ffile; |
| 336 |
nfiles--; |
| 337 |
} |
| 338 |
} else { |
| 339 |
rename (ffile, oldfile); |
| 340 |
free (oldfile); |
| 341 |
oldfile = ffile; |
| 342 |
} |
| 343 |
} |
| 344 |
if (ffile) |
| 345 |
free (ffile); |
| 346 |
free (files); |
| 347 |
} |
| 348 |
|
| 349 |
/* Now store our daemon info */ |
| 350 |
if (started) { |
| 351 |
char buffer[10]; |
| 352 |
FILE *fp; |
| 353 |
|
| 354 |
if (! rc_is_dir (dirpath)) |
| 355 |
if (mkdir (dirpath, 0755) != 0) |
| 356 |
eerror ("mkdir `%s': %s", dirpath, strerror (errno)); |
| 357 |
|
| 358 |
snprintf (buffer, sizeof (buffer), "%03d", nfiles + 1); |
| 359 |
file = rc_strcatpaths (dirpath, buffer, (char *) NULL); |
| 360 |
if ((fp = fopen (file, "w")) == NULL) |
| 361 |
eerror ("fopen `%s': %s", file, strerror (errno)); |
| 362 |
else { |
| 363 |
fprintf (fp, "%s\n%s\n%s\n", mexec, mname, mpidfile); |
| 364 |
fclose (fp); |
| 365 |
} |
| 366 |
free (file); |
| 367 |
} |
| 368 |
|
| 369 |
free (mexec); |
| 370 |
free (mname); |
| 371 |
free (mpidfile); |
| 372 |
free (dirpath); |
| 373 |
} |
| 374 |
librc_hidden_def(rc_set_service_daemon) |
| 375 |
|
| 376 |
bool rc_service_started_daemon (const char *service, const char *exec, |
| 377 |
int indx) |
| 378 |
{ |
| 379 |
char *dirpath; |
| 380 |
char *file; |
| 381 |
int i; |
| 382 |
char *mexec; |
| 383 |
bool retval = false; |
| 384 |
char *svc; |
| 385 |
|
| 386 |
if (! service || ! exec) |
| 387 |
return (false); |
| 388 |
|
| 389 |
svc = rc_xstrdup (service); |
| 390 |
dirpath = rc_strcatpaths (RC_SVCDIR, "daemons", basename (svc), |
| 391 |
(char *) NULL); |
| 392 |
free (svc); |
| 393 |
|
| 394 |
if (! rc_is_dir (dirpath)) { |
| 395 |
free (dirpath); |
| 396 |
return (false); |
| 397 |
} |
| 398 |
|
| 399 |
i = strlen (exec) + 6; |
| 400 |
mexec = rc_xmalloc (sizeof (char *) * i); |
| 401 |
snprintf (mexec, i, "exec=%s", exec); |
| 402 |
|
| 403 |
if (indx > 0) { |
| 404 |
int len = sizeof (char *) * 10; |
| 405 |
file = rc_xmalloc (len); |
| 406 |
snprintf (file, len, "%03d", indx); |
| 407 |
retval = _match_daemon (dirpath, file, mexec, NULL, NULL); |
| 408 |
free (file); |
| 409 |
} else { |
| 410 |
char **files = rc_ls_dir (NULL, dirpath, 0); |
| 411 |
STRLIST_FOREACH (files, file, i) { |
| 412 |
retval = _match_daemon (dirpath, file, mexec, NULL, NULL); |
| 413 |
if (retval) |
| 414 |
break; |
| 415 |
} |
| 416 |
free (files); |
| 417 |
} |
| 418 |
|
| 419 |
free (mexec); |
| 420 |
return (retval); |
| 421 |
} |
| 422 |
librc_hidden_def(rc_service_started_daemon) |
| 423 |
|
| 424 |
bool rc_service_daemons_crashed (const char *service) |
| 425 |
{ |
| 426 |
char *dirpath; |
| 427 |
char **files; |
| 428 |
char *file; |
| 429 |
char *path; |
| 430 |
int i; |
| 431 |
FILE *fp; |
| 432 |
char buffer[RC_LINEBUFFER]; |
| 433 |
char *exec = NULL; |
| 434 |
char *name = NULL; |
| 435 |
char *pidfile = NULL; |
| 436 |
pid_t pid = 0; |
| 437 |
pid_t *pids = NULL; |
| 438 |
char *p; |
| 439 |
char *token; |
| 440 |
bool retval = false; |
| 441 |
char *svc; |
| 442 |
|
| 443 |
if (! service) |
| 444 |
return (false); |
| 445 |
|
| 446 |
svc = rc_xstrdup (service); |
| 447 |
dirpath = rc_strcatpaths (RC_SVCDIR, "daemons", basename (svc), |
| 448 |
(char *) NULL); |
| 449 |
free (svc); |
| 450 |
|
| 451 |
if (! rc_is_dir (dirpath)) { |
| 452 |
free (dirpath); |
| 453 |
return (false); |
| 454 |
} |
| 455 |
|
| 456 |
memset (buffer, 0, sizeof (buffer)); |
| 457 |
files = rc_ls_dir (NULL, dirpath, 0); |
| 458 |
STRLIST_FOREACH (files, file, i) { |
| 459 |
path = rc_strcatpaths (dirpath, file, (char *) NULL); |
| 460 |
fp = fopen (path, "r"); |
| 461 |
free (path); |
| 462 |
if (! fp) { |
| 463 |
eerror ("fopen `%s': %s", file, strerror (errno)); |
| 464 |
continue; |
| 465 |
} |
| 466 |
|
| 467 |
while ((fgets (buffer, RC_LINEBUFFER, fp))) { |
| 468 |
int lb = strlen (buffer) - 1; |
| 469 |
if (buffer[lb] == '\n') |
| 470 |
buffer[lb] = 0; |
| 471 |
|
| 472 |
p = buffer; |
| 473 |
if ((token = strsep (&p, "=")) == NULL || ! p) |
| 474 |
continue; |
| 475 |
|
| 476 |
if (strlen (p) == 0) |
| 477 |
continue; |
| 478 |
|
| 479 |
if (strcmp (token, "exec") == 0) { |
| 480 |
if (exec) |
| 481 |
free (exec); |
| 482 |
exec = rc_xstrdup (p); |
| 483 |
} else if (strcmp (token, "name") == 0) { |
| 484 |
if (name) |
| 485 |
free (name); |
| 486 |
name = rc_xstrdup (p); |
| 487 |
} else if (strcmp (token, "pidfile") == 0) { |
| 488 |
if (pidfile) |
| 489 |
free (pidfile); |
| 490 |
pidfile = rc_xstrdup (p); |
| 491 |
} |
| 492 |
} |
| 493 |
fclose (fp); |
| 494 |
|
| 495 |
pid = 0; |
| 496 |
if (pidfile) { |
| 497 |
if (! rc_exists (pidfile)) { |
| 498 |
retval = true; |
| 499 |
break; |
| 500 |
} |
| 501 |
|
| 502 |
if ((fp = fopen (pidfile, "r")) == NULL) { |
| 503 |
eerror ("fopen `%s': %s", pidfile, strerror (errno)); |
| 504 |
retval = true; |
| 505 |
break; |
| 506 |
} |
| 507 |
|
| 508 |
if (fscanf (fp, "%d", &pid) != 1) { |
| 509 |
eerror ("no pid found in `%s'", pidfile); |
| 510 |
fclose (fp); |
| 511 |
retval = true; |
| 512 |
break; |
| 513 |
} |
| 514 |
|
| 515 |
fclose (fp); |
| 516 |
free (pidfile); |
| 517 |
pidfile = NULL; |
| 518 |
} |
| 519 |
|
| 520 |
if ((pids = rc_find_pids (exec, name, 0, pid)) == NULL) { |
| 521 |
retval = true; |
| 522 |
break; |
| 523 |
} |
| 524 |
free (pids); |
| 525 |
|
| 526 |
if (exec) { |
| 527 |
free (exec); |
| 528 |
exec = NULL; |
| 529 |
} |
| 530 |
if (name) { |
| 531 |
free (name); |
| 532 |
name = NULL; |
| 533 |
} |
| 534 |
} |
| 535 |
|
| 536 |
if (exec) { |
| 537 |
free (exec); |
| 538 |
exec = NULL; |
| 539 |
} |
| 540 |
if (name) { |
| 541 |
free (name); |
| 542 |
name = NULL; |
| 543 |
} |
| 544 |
|
| 545 |
free (dirpath); |
| 546 |
rc_strlist_free (files); |
| 547 |
|
| 548 |
return (retval); |
| 549 |
} |
| 550 |
librc_hidden_def(rc_service_daemons_crashed) |
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