/mandos/trunk : revision 742

9

* "browse_callback", and parts of "main".

10

*

11

* Everything else is

12

13

12

13

14

*

15

* This program is free software: you can redistribute it and/or

16

* modify it under the terms of the GNU General Public License as

32

/* Needed by GPGME, specifically gpgme_data_seek() */

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

#define _GNU_SOURCE /* TEMP_FAILURE_RETRY(), asprintf() */

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

#include <stdint.h> /* uint16_t, uint32_t, intptr_t */

45

#include <stddef.h> /* NULL, size_t, ssize_t */

46

#include <stdlib.h> /* free(), EXIT_SUCCESS, srand(),

55

opendir(), DIR */

56

#include <sys/stat.h> /* open(), S_ISREG */

57

#include <sys/socket.h> /* socket(), struct sockaddr_in6,

58

inet_pton(), connect() */

59

#include <fcntl.h> /* open() */

58

inet_pton(), connect(),

59

getnameinfo() */

60

#include <fcntl.h> /* open(), unlinkat() */

60

61

#include <dirent.h> /* opendir(), struct dirent, readdir()

61

62

*/

62

63

#include <inttypes.h> /* PRIu16, PRIdMAX, intmax_t,

72

73

*/

73

74

#include <unistd.h> /* close(), SEEK_SET, off_t, write(),

74

75

getuid(), getgid(), seteuid(),

75

setgid(), pause(), _exit() */

76

#include <arpa/inet.h> /* inet_pton(), htons, inet_ntop() */

76

setgid(), pause(), _exit(),

77

unlinkat() */

78

#include <arpa/inet.h> /* inet_pton(), htons() */

77

79

#include <iso646.h> /* not, or, and */

78

80

#include <argp.h> /* struct argp_option, error_t, struct

79

81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

#include <netdb.h> /* getnameinfo(), NI_NUMERICHOST,

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

#include <sys/klog.h> /* klogctl() */

138

142

static const char sys_class_net[] = "/sys/class/net";

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

180

185

perror(print_text);

181

186

}

182

187

183

__attribute__((format (gnu_printf, 2, 3)))

188

__attribute__((format (gnu_printf, 2, 3), nonnull))

184

189

int fprintf_plus(FILE *stream, const char *format, ...){

185

190

va_list ap;

186

191

va_start (ap, format);

187

192

188

193

TEMP_FAILURE_RETRY(fprintf(stream, "Mandos plugin %s: ",

189

194

program_invocation_short_name));

190

return TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

195

return (int)TEMP_FAILURE_RETRY(vfprintf(stream, format, ap));

191

196

}

192

197

193

198

/*

195

200

* bytes. "buffer_capacity" is how much is currently allocated,

196

201

* "buffer_length" is how much is already used.

197

202

*/

203

__attribute__((nonnull, warn_unused_result))

198

204

size_t incbuffer(char **buffer, size_t buffer_length,

199

205

size_t buffer_capacity){

200

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

*buffer = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

202

if(buffer == NULL){

207

char *new_buf = realloc(*buffer, buffer_capacity + BUFFER_SIZE);

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

203

213

return 0;

204

214

}

215

*buffer = new_buf;

205

216

buffer_capacity += BUFFER_SIZE;

206

217

}

207

218

return buffer_capacity;

208

219

}

209

220

210

221

/* Add server to set of servers to retry periodically */

222

__attribute__((nonnull, warn_unused_result))

211

223

bool add_server(const char *ip, in_port_t port, AvahiIfIndex if_index,

212

224

int af, server **current_server){

213

225

int ret;

222

234

.af = af };

223

235

if(new_server->ip == NULL){

224

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

ret = clock_gettime(CLOCK_MONOTONIC, &(new_server->last_seen));

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

free((char *)(new_server->ip));

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

225

252

return false;

226

253

}

227

254

/* Special case of first server */

229

256

new_server->next = new_server;

230

257

new_server->prev = new_server;

231

258

*current_server = new_server;

232

/* Place the new server last in the list */

233

259

} else {

260

/* Place the new server last in the list */

234

261

new_server->next = *current_server;

235

262

new_server->prev = (*current_server)->prev;

236

263

new_server->prev->next = new_server;

237

264

(*current_server)->prev = new_server;

238

265

}

239

ret = clock_gettime(CLOCK_MONOTONIC, &(*current_server)->last_seen);

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

266

return true;

245

267

}

246

268

247

269

/*

248

270

* Initialize GPGME.

249

271

*/

250

static bool init_gpgme(const char *seckey, const char *pubkey,

251

const char *tempdir, mandos_context *mc){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

252

277

gpgme_error_t rc;

253

278

gpgme_engine_info_t engine_info;

254

279

255

280

/*

256

281

* Helper function to insert pub and seckey to the engine keyring.

257

282

*/

258

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

259

284

int ret;

260

285

int fd;

261

286

gpgme_data_t pgp_data;

342

367

* Decrypt OpenPGP data.

343

368

* Returns -1 on error

344

369

*/

370

__attribute__((nonnull, warn_unused_result))

345

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

372

size_t crypto_size,

347

373

char **plaintext,

467

493

return plaintext_length;

468

494

}

469

495

470

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

471

498

const char *ret = gnutls_strerror(value);

472

499

if(ret == NULL)

473

500

ret = "(unknown)";

475

502

}

476

503

477

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

478

506

static void debuggnutls(__attribute__((unused)) int level,

479

507

const char* string){

480

508

fprintf_plus(stderr, "GnuTLS: %s", string);

481

509

}

482

510

511

__attribute__((nonnull, warn_unused_result))

483

512

static int init_gnutls_global(const char *pubkeyfilename,

484

513

const char *seckeyfilename,

485

514

mandos_context *mc){

559

588

return -1;

560

589

}

561

590

591

__attribute__((nonnull, warn_unused_result))

562

592

static int init_gnutls_session(gnutls_session_t *session,

563

593

mandos_context *mc){

564

594

int ret;

621

651

__attribute__((unused)) const char *txt){}

622

652

623

653

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

624

655

static int start_mandos_communication(const char *ip, in_port_t port,

625

656

AvahiIfIndex if_index,

626

657

int af, mandos_context *mc){

627

658

int ret, tcp_sd = -1;

628

659

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

660

struct sockaddr_storage to;

633

661

char *buffer = NULL;

634

662

char *decrypted_buffer = NULL;

635

663

size_t buffer_length = 0;

716

744

717

745

memset(&to, 0, sizeof(to));

718

746

if(af == AF_INET6){

719

to.in6.sin6_family = (sa_family_t)af;

720

ret = inet_pton(af, ip, &to.in6.sin6_addr);

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

721

749

} else { /* IPv4 */

722

to.in.sin_family = (sa_family_t)af;

723

ret = inet_pton(af, ip, &to.in.sin_addr);

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

724

752

}

725

753

if(ret < 0 ){

726

754

int e = errno;

735

763

goto mandos_end;

736

764

}

737

765

if(af == AF_INET6){

738

to.in6.sin6_port = htons(port);

739

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

740

(&to.in6.sin6_addr)){ /* -Wstrict-aliasing=2 or lower and

741

-Wunreachable-code*/

766

((struct sockaddr_in6 *)&to)->sin6_port = htons(port);

767

if(IN6_IS_ADDR_LINKLOCAL

768

(&((struct sockaddr_in6 *)&to)->sin6_addr)){

742

769

if(if_index == AVAHI_IF_UNSPEC){

743

770

fprintf_plus(stderr, "An IPv6 link-local address is"

744

771

" incomplete without a network interface\n");

746

773

goto mandos_end;

747

774

}

748

775

/* Set the network interface number as scope */

749

to.in6.sin6_scope_id = (uint32_t)if_index;

776

((struct sockaddr_in6 *)&to)->sin6_scope_id = (uint32_t)if_index;

750

777

}

751

778

} else {

752

to.in.sin_port = htons(port); /* Spurious warnings from

753

-Wconversion and

754

-Wunreachable-code */

779

((struct sockaddr_in *)&to)->sin_port = htons(port);

755

780

}

756

781

757

782

if(quit_now){

774

799

}

775

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

776

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

778

802

if(af == AF_INET6){

779

pcret = inet_ntop(af, &(to.in6.sin6_addr), addrstr,

780

sizeof(addrstr));

803

ret = getnameinfo((struct sockaddr *)&to,

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

781

807

} else {

782

pcret = inet_ntop(af, &(to.in.sin_addr), addrstr,

783

sizeof(addrstr));

808

ret = getnameinfo((struct sockaddr *)&to,

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

784

812

}

785

if(pcret == NULL){

786

perror_plus("inet_ntop");

787

} else {

788

if(strcmp(addrstr, ip) != 0){

789

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

790

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

817

} else if(strcmp(addrstr, ip) != 0){

818

fprintf_plus(stderr, "Canonical address form: %s\n", addrstr);

791

819

}

792

820

}

793

821

797

825

}

798

826

799

827

if(af == AF_INET6){

800

ret = connect(tcp_sd, &to.in6, sizeof(to));

828

ret = connect(tcp_sd, (struct sockaddr *)&to,

829

sizeof(struct sockaddr_in6));

801

830

} else {

802

ret = connect(tcp_sd, &to.in, sizeof(to)); /* IPv4 */

831

ret = connect(tcp_sd, (struct sockaddr *)&to, /* IPv4 */

832

sizeof(struct sockaddr_in));

803

833

}

804

834

if(ret < 0){

805

if ((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

835

if((errno != ECONNREFUSED and errno != ENETUNREACH) or debug){

806

836

int e = errno;

807

837

perror_plus("connect");

808

838

errno = e;

1023

1053

return retval;

1024

1054

}

1025

1055

1056

__attribute__((nonnull))

1026

1057

static void resolve_callback(AvahiSServiceResolver *r,

1027

1058

AvahiIfIndex interface,

1028

1059

AvahiProtocol proto,

1036

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1037

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1038

1069

flags,

1039

void* mc){

1070

void *mc){

1040

1071

if(r == NULL){

1041

1072

return;

1042

1073

}

1045

1076

timed out */

1046

1077

1047

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1048

1080

return;

1049

1081

}

1050

1082

1095

1127

const char *domain,

1096

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1097

1129

flags,

1098

void* mc){

1130

void *mc){

1099

1131

if(b == NULL){

1100

1132

return;

1101

1133

}

1161

1193

errno = old_errno;

1162

1194

}

1163

1195

1196

__attribute__((nonnull, warn_unused_result))

1164

1197

bool get_flags(const char *ifname, struct ifreq *ifr){

1165

1198

int ret;

1166

1199

error_t ret_errno;

1185

1218

return true;

1186

1219

}

1187

1220

1221

__attribute__((nonnull, warn_unused_result))

1188

1222

bool good_flags(const char *ifname, const struct ifreq *ifr){

1189

1223

1190

1224

/* Reject the loopback device */

1232

1266

* corresponds to an acceptable network device.

1233

1267

* (This function is passed to scandir(3) as a filter function.)

1234

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1235

1270

int good_interface(const struct dirent *if_entry){

1236

1271

if(if_entry->d_name[0] == '.'){

1237

1272

return 0;

1255

1290

/*

1256

1291

* This function determines if a network interface is up.

1257

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1258

1294

bool interface_is_up(const char *interface){

1259

1295

struct ifreq ifr;

1260

1296

if(not get_flags(interface, &ifr)){

1271

1307

/*

1272

1308

* This function determines if a network interface is running

1273

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1274

1311

bool interface_is_running(const char *interface){

1275

1312

struct ifreq ifr;

1276

1313

if(not get_flags(interface, &ifr)){

1284

1321

return (bool)(ifr.ifr_flags & IFF_RUNNING);

1285

1322

}

1286

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1287

1325

int notdotentries(const struct dirent *direntry){

1288

1326

/* Skip "." and ".." */

1289

1327

if(direntry->d_name[0] == '.'

1296

1334

}

1297

1335

1298

1336

/* Is this directory entry a runnable program? */

1337

__attribute__((nonnull, warn_unused_result))

1299

1338

int runnable_hook(const struct dirent *direntry){

1300

1339

int ret;

1301

1340

size_t sret;

1309

1348

sret = strspn(direntry->d_name, "ABCDEFGHIJKLMNOPQRSTUVWXYZ"

1310

1349

"abcdefghijklmnopqrstuvwxyz"

1311

1350

"0123456789"

1312

"_-");

1351

"_.-");

1313

1352

if((direntry->d_name)[sret] != '\0'){

1314

1353

/* Contains non-allowed characters */

1315

1354

if(debug){

1319

1358

return 0;

1320

1359

}

1321

1360

1322

char *fullname = NULL;

1323

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1324

if(ret < 0){

1325

perror_plus("asprintf");

1326

return 0;

1327

}

1328

1329

ret = stat(fullname, &st);

1361

ret = fstatat(hookdir_fd, direntry->d_name, &st, 0);

1330

1362

if(ret == -1){

1331

1363

if(debug){

1332

1364

perror_plus("Could not stat hook");

1356

1388

return 1;

1357

1389

}

1358

1390

1391

__attribute__((nonnull, warn_unused_result))

1359

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1360

1393

mandos_context *mc){

1361

1394

int ret;

1365

1398

1366

1399

while(true){

1367

1400

if(mc->current_server == NULL){

1368

if (debug){

1401

if(debug){

1369

1402

fprintf_plus(stderr, "Wait until first server is found."

1370

1403

" No timeout!\n");

1371

1404

}

1372

1405

ret = avahi_simple_poll_iterate(s, -1);

1373

1406

} else {

1374

if (debug){

1407

if(debug){

1375

1408

fprintf_plus(stderr, "Check current_server if we should run"

1376

1409

" it, or wait\n");

1377

1410

}

1394

1427

- ((intmax_t)waited_time.tv_sec * 1000))

1395

1428

- ((intmax_t)waited_time.tv_nsec / 1000000));

1396

1429

1397

if (debug){

1430

if(debug){

1398

1431

fprintf_plus(stderr, "Blocking for %" PRIdMAX " ms\n",

1399

1432

block_time);

1400

1433

}

1422

1455

ret = avahi_simple_poll_iterate(s, (int)block_time);

1423

1456

}

1424

1457

if(ret != 0){

1425

if (ret > 0 or errno != EINTR){

1458

if(ret > 0 or errno != EINTR){

1426

1459

return (ret != 1) ? ret : 0;

1427

1460

}

1428

1461

}

1430

1463

}

1431

1464

1432

1465

/* Set effective uid to 0, return errno */

1466

__attribute__((warn_unused_result))

1433

1467

error_t raise_privileges(void){

1434

1468

error_t old_errno = errno;

1435

1469

error_t ret_errno = 0;

1436

1470

if(seteuid(0) == -1){

1437

1471

ret_errno = errno;

1438

perror_plus("seteuid");

1439

1472

}

1440

1473

errno = old_errno;

1441

1474

return ret_errno;

1442

1475

}

1443

1476

1444

1477

/* Set effective and real user ID to 0. Return errno. */

1478

__attribute__((warn_unused_result))

1445

1479

error_t raise_privileges_permanently(void){

1446

1480

error_t old_errno = errno;

1447

1481

error_t ret_errno = raise_privileges();

1451

1485

}

1452

1486

if(setuid(0) == -1){

1453

1487

ret_errno = errno;

1454

perror_plus("seteuid");

1455

1488

}

1456

1489

errno = old_errno;

1457

1490

return ret_errno;

1458

1491

}

1459

1492

1460

1493

/* Set effective user ID to unprivileged saved user ID */

1494

__attribute__((warn_unused_result))

1461

1495

error_t lower_privileges(void){

1462

1496

error_t old_errno = errno;

1463

1497

error_t ret_errno = 0;

1464

1498

if(seteuid(uid) == -1){

1465

1499

ret_errno = errno;

1466

perror_plus("seteuid");

1467

1500

}

1468

1501

errno = old_errno;

1469

1502

return ret_errno;

1470

1503

}

1471

1504

1472

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1473

1507

error_t lower_privileges_permanently(void){

1474

1508

error_t old_errno = errno;

1475

1509

error_t ret_errno = 0;

1476

1510

if(setuid(uid) == -1){

1477

1511

ret_errno = errno;

1478

perror_plus("setuid");

1479

1512

}

1480

1513

errno = old_errno;

1481

1514

return ret_errno;

1482

1515

}

1483

1516

1484

bool run_network_hooks(const char *mode, const char *interface,

1517

__attribute__((nonnull))

1518

void run_network_hooks(const char *mode, const char *interface,

1485

1519

const float delay){

1486

struct dirent **direntries;

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

runnable_hook, alphasort);

1539

#else /* not __GLIBC_PREREQ(2, 15) */

1540

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1541

alphasort);

1542

#endif /* not __GLIBC_PREREQ(2, 15) */

1543

#else /* not __GLIBC__ */

1544

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1547

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1487

1551

struct dirent *direntry;

1488

1552

int ret;

1489

int numhooks = scandir(hookdir, &direntries, runnable_hook,

1490

alphasort);

1491

if(numhooks == -1){

1492

if(errno == ENOENT){

1493

if(debug){

1494

fprintf_plus(stderr, "Network hook directory \"%s\" not"

1495

" found\n", hookdir);

1496

}

1497

} else {

1498

perror_plus("scandir");

1553

int devnull = open("/dev/null", O_RDONLY);

1554

for(int i = 0; i < numhooks; i++){

1555

direntry = direntries[i];

1556

if(debug){

1557

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1558

direntry->d_name);

1499

1559

}

1500

} else {

1501

int devnull = open("/dev/null", O_RDONLY);

1502

for(int i = 0; i < numhooks; i++){

1503

direntry = direntries[i];

1504

char *fullname = NULL;

1505

ret = asprintf(&fullname, "%s/%s", hookdir, direntry->d_name);

1506

if(ret < 0){

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

perror_plus("dup2(devnull, STDIN_FILENO)");

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

perror_plus("dup2(STDERR_FILENO, STDOUT_FILENO)");

1596

_exit(EX_OSERR);

1597

}

1598

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

ret = setenv("DEVICE", interface, 1);

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

ret = setenv("MODE", mode, 1);

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

ret = asprintf(&delaystring, "%f", (double)delay);

1620

if(ret == -1){

1507

1621

perror_plus("asprintf");

1508

continue;

1509

}

1510

if(debug){

1511

fprintf_plus(stderr, "Running network hook \"%s\"\n",

1512

direntry->d_name);

1513

}

1514

pid_t hook_pid = fork();

1515

if(hook_pid == 0){

1516

/* Child */

1517

/* Raise privileges */

1518

raise_privileges_permanently();

1519

/* Set group */

1520

errno = 0;

1521

ret = setgid(0);

1522

if(ret == -1){

1523

perror_plus("setgid");

1524

}

1525

/* Reset supplementary groups */

1526

errno = 0;

1527

ret = setgroups(0, NULL);

1528

if(ret == -1){

1529

perror_plus("setgroups");

1530

}

1531

dup2(devnull, STDIN_FILENO);

1532

close(devnull);

1533

dup2(STDERR_FILENO, STDOUT_FILENO);

1534

ret = setenv("MANDOSNETHOOKDIR", hookdir, 1);

1535

if(ret == -1){

1536

perror_plus("setenv");

1537

_exit(EX_OSERR);

1538

}

1539

ret = setenv("DEVICE", interface, 1);

1540

if(ret == -1){

1541

perror_plus("setenv");

1542

_exit(EX_OSERR);

1543

}

1544

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1545

if(ret == -1){

1546

perror_plus("setenv");

1547

_exit(EX_OSERR);

1548

}

1549

ret = setenv("MODE", mode, 1);

1550

if(ret == -1){

1551

perror_plus("setenv");

1552

_exit(EX_OSERR);

1553

}

1554

char *delaystring;

1555

ret = asprintf(&delaystring, "%f", delay);

1556

if(ret == -1){

1557

perror_plus("asprintf");

1558

_exit(EX_OSERR);

1559

}

1560

ret = setenv("DELAY", delaystring, 1);

1561

if(ret == -1){

1562

free(delaystring);

1563

perror_plus("setenv");

1564

_exit(EX_OSERR);

1565

}

1622

_exit(EX_OSERR);

1623

}

1624

ret = setenv("DELAY", delaystring, 1);

1625

if(ret == -1){

1566

1626

free(delaystring);

1567

if(connect_to != NULL){

1568

ret = setenv("CONNECT", connect_to, 1);

1569

if(ret == -1){

1570

perror_plus("setenv");

1571

_exit(EX_OSERR);

1572

}

1573

}

1574

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1575

perror_plus("execl");

1576

_exit(EXIT_FAILURE);

1577

}

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

ret = setenv("CONNECT", connect_to, 1);

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

if(hook_pid == -1){

1654

perror_plus("fork");

1655

free(direntry);

1656

continue;

1657

}

1658

int status;

1659

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1660

perror_plus("waitpid");

1661

free(direntry);

1662

continue;

1663

}

1664

if(WIFEXITED(status)){

1665

if(WEXITSTATUS(status) != 0){

1666

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1667

" with status %d\n", direntry->d_name,

1668

WEXITSTATUS(status));

1669

free(direntry);

1670

continue;

1671

}

1672

} else if(WIFSIGNALED(status)){

1673

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1674

" signal %d\n", direntry->d_name,

1675

WTERMSIG(status));

1676

free(direntry);

1677

continue;

1578

1678

} else {

1579

int status;

1580

if(TEMP_FAILURE_RETRY(waitpid(hook_pid, &status, 0)) == -1){

1581

perror_plus("waitpid");

1582

free(fullname);

1583

continue;

1584

}

1585

if(WIFEXITED(status)){

1586

if(WEXITSTATUS(status) != 0){

1587

fprintf_plus(stderr, "Warning: network hook \"%s\" exited"

1588

" with status %d\n", direntry->d_name,

1589

WEXITSTATUS(status));

1590

free(fullname);

1591

continue;

1592

}

1593

} else if(WIFSIGNALED(status)){

1594

fprintf_plus(stderr, "Warning: network hook \"%s\" died by"

1595

" signal %d\n", direntry->d_name,

1596

WTERMSIG(status));

1597

free(fullname);

1598

continue;

1599

} else {

1600

fprintf_plus(stderr, "Warning: network hook \"%s\""

1601

" crashed\n", direntry->d_name);

1602

free(fullname);

1603

continue;

1604

}

1605

}

1606

free(fullname);

1607

if(debug){

1608

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1609

direntry->d_name);

1610

}

1611

}

1612

close(devnull);

1613

}

1614

return true;

1679

fprintf_plus(stderr, "Warning: network hook \"%s\""

1680

" crashed\n", direntry->d_name);

1681

free(direntry);

1682

continue;

1683

}

1684

}

1685

if(debug){

1686

fprintf_plus(stderr, "Network hook \"%s\" ran successfully\n",

1687

direntry->d_name);

1688

}

1689

free(direntry);

1690

}

1691

free(direntries);

1692

if((int)TEMP_FAILURE_RETRY(close(hookdir_fd)) == -1){

1693

perror_plus("close");

1694

} else {

1695

hookdir_fd = -1;

1696

}

1697

close(devnull);

1615

1698

}

1616

1699

1700

__attribute__((nonnull, warn_unused_result))

1617

1701

error_t bring_up_interface(const char *const interface,

1618

1702

const float delay){

1619

int sd = -1;

1620

1703

error_t old_errno = errno;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1704

int ret;

1623

1705

struct ifreq network;

1624

1706

unsigned int if_index = if_nametoindex(interface);

1625

1707

if(if_index == 0){

1634

1716

}

1635

1717

1636

1718

if(not interface_is_up(interface)){

1637

if(not get_flags(interface, &network) and debug){

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

if(not get_flags(interface, &network)){

1638

1721

ret_errno = errno;

1639

1722

fprintf_plus(stderr, "Failed to get flags for interface "

1640

1723

"\"%s\"\n", interface);

1724

errno = old_errno;

1641

1725

return ret_errno;

1642

1726

}

1643

network.ifr_flags |= IFF_UP;

1727

network.ifr_flags |= IFF_UP; /* set flag */

1644

1728

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1729

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1730

if(sd == -1){

1647

1731

ret_errno = errno;

1648

1732

perror_plus("socket");

1649

1733

errno = old_errno;

1650

1734

return ret_errno;

1651

1735

}

1652

1736

1653

1737

if(quit_now){

1654

close(sd);

1738

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1655

1742

errno = old_errno;

1656

1743

return EINTR;

1657

1744

}

1661

1748

interface);

1662

1749

}

1663

1750

1664

/* Raise priviliges */

1665

raise_privileges();

1751

/* Raise privileges */

1752

ret_errno = raise_privileges();

1753

if(ret_errno != 0){

1754

errno = ret_errno;

1755

perror_plus("Failed to raise privileges");

1756

}

1666

1757

1667

1758

#ifdef __linux__

1668

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1669

messages about the network interface to mess up the prompt */

1670

int ret_linux = klogctl(8, NULL, 5);

1671

bool restore_loglevel = true;

1672

if(ret_linux == -1){

1673

restore_loglevel = false;

1674

perror_plus("klogctl");

1759

int ret_linux;

1760

bool restore_loglevel = false;

1761

if(ret_errno == 0){

1762

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1763

messages about the network interface to mess up the prompt */

1764

ret_linux = klogctl(8, NULL, 5);

1765

if(ret_linux == -1){

1766

perror_plus("klogctl");

1767

} else {

1768

restore_loglevel = true;

1769

}

1675

1770

}

1676

1771

#endif /* __linux__ */

1677

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1678

ret_errno = errno;

1772

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1773

ioctl_errno = errno;

1679

1774

#ifdef __linux__

1680

1775

if(restore_loglevel){

1681

1776

ret_linux = klogctl(7, NULL, 0);

1685

1780

}

1686

1781

#endif /* __linux__ */

1687

1782

1688

/* Lower privileges */

1689

lower_privileges();

1783

/* If raise_privileges() succeeded above */

1784

if(ret_errno == 0){

1785

/* Lower privileges */

1786

ret_errno = lower_privileges();

1787

if(ret_errno != 0){

1788

errno = ret_errno;

1789

perror_plus("Failed to lower privileges");

1790

}

1791

}

1690

1792

1691

1793

/* Close the socket */

1692

1794

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1695

1797

}

1696

1798

1697

1799

if(ret_setflags == -1){

1698

errno = ret_errno;

1800

errno = ioctl_errno;

1699

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1700

1802

errno = old_errno;

1701

return ret_errno;

1803

return ioctl_errno;

1702

1804

}

1703

1805

} else if(debug){

1704

1806

fprintf_plus(stderr, "Interface \"%s\" is already up; good\n",

1722

1824

return 0;

1723

1825

}

1724

1826

1827

__attribute__((nonnull, warn_unused_result))

1725

1828

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1727

1829

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1730

1830

struct ifreq network;

1731

1831

unsigned int if_index = if_nametoindex(interface);

1732

1832

if(if_index == 0){

1735

1835

return ENXIO;

1736

1836

}

1737

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1738

1839

if(not get_flags(interface, &network) and debug){

1739

1840

ret_errno = errno;

1740

1841

fprintf_plus(stderr, "Failed to get flags for interface "

1741

1842

"\"%s\"\n", interface);

1843

errno = old_errno;

1742

1844

return ret_errno;

1743

1845

}

1744

1846

network.ifr_flags &= ~(short)IFF_UP; /* clear flag */

1745

1847

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1848

int sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1849

if(sd == -1){

1748

1850

ret_errno = errno;

1749

1851

perror_plus("socket");

1750

1852

errno = old_errno;

1756

1858

interface);

1757

1859

}

1758

1860

1759

/* Raise priviliges */

1760

raise_privileges();

1761

1762

ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1763

ret_errno = errno;

1764

1765

/* Lower privileges */

1766

lower_privileges();

1861

/* Raise privileges */

1862

ret_errno = raise_privileges();

1863

if(ret_errno != 0){

1864

errno = ret_errno;

1865

perror_plus("Failed to raise privileges");

1866

}

1867

1868

int ret_setflags = ioctl(sd, SIOCSIFFLAGS, &network);

1869

ioctl_errno = errno;

1870

1871

/* If raise_privileges() succeeded above */

1872

if(ret_errno == 0){

1873

/* Lower privileges */

1874

ret_errno = lower_privileges();

1875

if(ret_errno != 0){

1876

errno = ret_errno;

1877

perror_plus("Failed to lower privileges");

1878

}

1879

}

1767

1880

1768

1881

/* Close the socket */

1769

ret = (int)TEMP_FAILURE_RETRY(close(sd));

1882

int ret = (int)TEMP_FAILURE_RETRY(close(sd));

1770

1883

if(ret == -1){

1771

1884

perror_plus("close");

1772

1885

}

1773

1886

1774

1887

if(ret_setflags == -1){

1775

errno = ret_errno;

1888

errno = ioctl_errno;

1776

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1777

1890

errno = old_errno;

1778

return ret_errno;

1891

return ioctl_errno;

1779

1892

}

1780

1893

} else if(debug){

1781

1894

fprintf_plus(stderr, "Interface \"%s\" is already down; odd\n",

1789

1902

int main(int argc, char *argv[]){

1790

1903

mandos_context mc = { .server = NULL, .dh_bits = 1024,

1791

1904

.priority = "SECURE256:!CTYPE-X.509:"

1792

"+CTYPE-OPENPGP", .current_server = NULL,

1905

"+CTYPE-OPENPGP:!RSA", .current_server = NULL,

1793

1906

.interfaces = NULL, .interfaces_size = 0 };

1794

1907

AvahiSServiceBrowser *sb = NULL;

1795

1908

error_t ret_errno;

1799

1912

int exitcode = EXIT_SUCCESS;

1800

1913

char *interfaces_to_take_down = NULL;

1801

1914

size_t interfaces_to_take_down_size = 0;

1802

char tempdir[] = "/tmp/mandosXXXXXX";

1803

bool tempdir_created = false;

1915

char run_tempdir[] = "/run/tmp/mandosXXXXXX";

1916

char old_tempdir[] = "/tmp/mandosXXXXXX";

1917

char *tempdir = NULL;

1804

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1805

1919

const char *seckey = PATHDIR "/" SECKEY;

1806

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1807

1921

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1809

1922

1810

1923

bool gnutls_initialized = false;

1811

1924

bool gpgme_initialized = false;

1989

2102

/* Work around Debian bug #633582:

1990

2103

<http://bugs.debian.org/633582> */

1991

2104

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2105

/* Re-raise privileges */

2106

ret_errno = raise_privileges();

2107

if(ret_errno != 0){

2108

errno = ret_errno;

2109

perror_plus("Failed to raise privileges");

2110

} else {

1994

2111

struct stat st;

1995

2112

1996

2113

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2036

2153

}

2037

2154

2038

2155

/* Lower privileges */

2039

lower_privileges();

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2160

}

2040

2161

}

2041

2162

}

2042

2163

2066

2187

goto end;

2067

2188

}

2068

2189

memcpy(interfaces_hooks, mc.interfaces, mc.interfaces_size);

2069

interfaces_hooks_size = mc.interfaces_size;

2070

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2071

(int)',');

2072

}

2073

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2074

interfaces_hooks : "", delay)){

2075

goto end;

2076

}

2190

argz_stringify(interfaces_hooks, mc.interfaces_size, (int)',');

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

2077

2194

}

2078

2195

2079

2196

if(not debug){

2157

2274

2158

2275

/* If no interfaces were specified, make a list */

2159

2276

if(mc.interfaces == NULL){

2160

struct dirent **direntries;

2277

struct dirent **direntries = NULL;

2161

2278

/* Look for any good interfaces */

2162

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2163

2280

alphasort);

2167

2284

ret_errno = argz_add(&mc.interfaces, &mc.interfaces_size,

2168

2285

direntries[i]->d_name);

2169

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2170

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2171

2290

continue;

2172

2291

}

2173

2292

if(debug){

2174

2293

fprintf_plus(stderr, "Will use interface \"%s\"\n",

2175

2294

direntries[i]->d_name);

2176

2295

}

2296

free(direntries[i]);

2177

2297

}

2178

2298

free(direntries);

2179

2299

} else {

2180

free(direntries);

2300

if(ret == 0){

2301

free(direntries);

2302

}

2181

2303

fprintf_plus(stderr, "Could not find a network interface\n");

2182

2304

exitcode = EXIT_FAILURE;

2183

2305

goto end;

2206

2328

break;

2207

2329

}

2208

2330

bool interface_was_up = interface_is_up(interface);

2209

ret = bring_up_interface(interface, delay);

2331

errno = bring_up_interface(interface, delay);

2210

2332

if(not interface_was_up){

2211

if(ret != 0){

2212

errno = ret;

2333

if(errno != 0){

2213

2334

perror_plus("Failed to bring up interface");

2214

2335

} else {

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2336

errno = argz_add(&interfaces_to_take_down,

2337

&interfaces_to_take_down_size,

2338

interface);

2339

if(errno != 0){

2340

perror_plus("argz_add");

2341

}

2218

2342

}

2219

2343

}

2220

2344

}

2249

2373

goto end;

2250

2374

}

2251

2375

2252

if(mkdtemp(tempdir) == NULL){

2376

/* Try /run/tmp before /tmp */

2377

tempdir = mkdtemp(run_tempdir);

2378

if(tempdir == NULL and errno == ENOENT){

2379

if(debug){

2380

fprintf_plus(stderr, "Tempdir %s did not work, trying %s\n",

2381

run_tempdir, old_tempdir);

2382

}

2383

tempdir = mkdtemp(old_tempdir);

2384

}

2385

if(tempdir == NULL){

2253

2386

perror_plus("mkdtemp");

2254

2387

goto end;

2255

2388

}

2256

tempdir_created = true;

2257

2389

2258

2390

if(quit_now){

2259

2391

goto end;

2331

2463

fprintf_plus(stderr, "Retrying in %d seconds\n",

2332

2464

(int)retry_interval);

2333

2465

}

2334

sleep((int)retry_interval);

2466

sleep((unsigned int)retry_interval);

2335

2467

}

2336

2468

2337

if (not quit_now){

2469

if(not quit_now){

2338

2470

exitcode = EXIT_SUCCESS;

2339

2471

}

2340

2472

2395

2527

if(debug){

2396

2528

fprintf_plus(stderr, "Starting Avahi loop search\n");

2397

2529

}

2398

2530

2399

2531

ret = avahi_loop_with_timeout(simple_poll,

2400

2532

(int)(retry_interval * 1000), &mc);

2401

2533

if(debug){

2437

2569

mc.current_server->prev->next = NULL;

2438

2570

while(mc.current_server != NULL){

2439

2571

server *next = mc.current_server->next;

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic push

2574

#pragma GCC diagnostic ignored "-Wcast-qual"

2575

#endif

2576

free((char *)(mc.current_server->ip));

2577

#ifdef __GNUC__

2578

#pragma GCC diagnostic pop

2579

#endif

2440

2580

free(mc.current_server);

2441

2581

mc.current_server = next;

2442

2582

}

2443

2583

}

2444

2584

2445

/* Re-raise priviliges */

2585

/* Re-raise privileges */

2446

2586

{

2447

raise_privileges();

2448

2449

/* Run network hooks */

2450

run_network_hooks("stop", interfaces_hooks != NULL ?

2451

interfaces_hooks : "", delay);

2452

2453

/* Take down the network interfaces which were brought up */

2454

{

2455

char *interface = NULL;

2456

while((interface=argz_next(interfaces_to_take_down,

2457

interfaces_to_take_down_size,

2458

interface))){

2459

ret_errno = take_down_interface(interface);

2460

if(ret_errno != 0){

2461

errno = ret_errno;

2462

perror_plus("Failed to take down interface");

2463

}

2464

}

2465

if(debug and (interfaces_to_take_down == NULL)){

2466

fprintf_plus(stderr, "No interfaces needed to be taken"

2467

" down\n");

2468

}

2469

}

2470

2471

lower_privileges_permanently();

2587

ret_errno = raise_privileges();

2588

if(ret_errno != 0){

2589

errno = ret_errno;

2590

perror_plus("Failed to raise privileges");

2591

} else {

2592

2593

/* Run network hooks */

2594

run_network_hooks("stop", interfaces_hooks != NULL ?

2595

interfaces_hooks : "", delay);

2596

2597

/* Take down the network interfaces which were brought up */

2598

{

2599

char *interface = NULL;

2600

while((interface=argz_next(interfaces_to_take_down,

2601

interfaces_to_take_down_size,

2602

interface))){

2603

ret_errno = take_down_interface(interface);

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to take down interface");

2607

}

2608

}

2609

if(debug and (interfaces_to_take_down == NULL)){

2610

fprintf_plus(stderr, "No interfaces needed to be taken"

2611

" down\n");

2612

}

2613

}

2614

}

2615

2616

ret_errno = lower_privileges_permanently();

2617

if(ret_errno != 0){

2618

errno = ret_errno;

2619

perror_plus("Failed to lower privileges permanently");

2620

}

2472

2621

}

2473

2622

2474

2623

free(interfaces_to_take_down);

2475

2624

free(interfaces_hooks);

2476

2625

2477

2626

/* Removes the GPGME temp directory and all files inside */

2478

if(tempdir_created){

2627

if(tempdir != NULL){

2479

2628

struct dirent **direntries = NULL;

2480

struct dirent *direntry = NULL;

2481

int numentries = scandir(tempdir, &direntries, notdotentries,

2482

alphasort);

2483

if (numentries > 0){

2484

for(int i = 0; i < numentries; i++){

2485

direntry = direntries[i];

2486

char *fullname = NULL;

2487

ret = asprintf(&fullname, "%s/%s", tempdir,

2488

direntry->d_name);

2489

if(ret < 0){

2490

perror_plus("asprintf");

2491

continue;

2492

}

2493

ret = remove(fullname);

2494

if(ret == -1){

2495

fprintf_plus(stderr, "remove(\"%s\"): %s\n", fullname,

2496

strerror(errno));

2497

}

2498

free(fullname);

2629

int tempdir_fd = (int)TEMP_FAILURE_RETRY(open(tempdir, O_RDONLY |

2630

O_NOFOLLOW));

2631

if(tempdir_fd == -1){

2632

perror_plus("open");

2633

} else {

2634

#ifdef __GLIBC__

2635

#if __GLIBC_PREREQ(2, 15)

2636

int numentries = scandirat(tempdir_fd, ".", &direntries,

2637

notdotentries, alphasort);

2638

#else /* not __GLIBC_PREREQ(2, 15) */

2639

int numentries = scandir(tempdir, &direntries, notdotentries,

2640

alphasort);

2641

#endif /* not __GLIBC_PREREQ(2, 15) */

2642

#else /* not __GLIBC__ */

2643

int numentries = scandir(tempdir, &direntries, notdotentries,

2644

alphasort);

2645

#endif /* not __GLIBC__ */

2646

if(numentries >= 0){

2647

for(int i = 0; i < numentries; i++){

2648

ret = unlinkat(tempdir_fd, direntries[i]->d_name, 0);

2649

if(ret == -1){

2650

fprintf_plus(stderr, "unlinkat(open(\"%s\", O_RDONLY),"

2651

" \"%s\", 0): %s\n", tempdir,

2652

direntries[i]->d_name, strerror(errno));

2653

}

2654

free(direntries[i]);

2655

}

2656

2657

/* need to clean even if 0 because man page doesn't specify */

2658

free(direntries);

2659

if(numentries == -1){

2660

perror_plus("scandir");

2661

}

2662

ret = rmdir(tempdir);

2663

if(ret == -1 and errno != ENOENT){

2664

perror_plus("rmdir");

2665

}

2499

2666

}

2500

}

2501

2502

/* need to clean even if 0 because man page doesn't specify */

2503

free(direntries);

2504

if (numentries == -1){

2505

perror_plus("scandir");

2506

}

2507

ret = rmdir(tempdir);

2508

if(ret == -1 and errno != ENOENT){

2509

perror_plus("rmdir");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2510

2668

}

2511

2669

}

2512

2670