/mandos/trunk : revision 237.4.54

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);

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

#ifdef __GNUC__

740

#pragma GCC diagnostic push

741

#pragma GCC diagnostic ignored "-Wstrict-aliasing"

742

#endif

743

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

744

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

745

#ifdef __GNUC__

746

#pragma GCC diagnostic pop

747

#endif

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

748

769

if(if_index == AVAHI_IF_UNSPEC){

749

770

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

750

771

" incomplete without a network interface\n");

752

773

goto mandos_end;

753

774

}

754

775

/* Set the network interface number as scope */

755

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

756

777

}

757

778

} else {

758

to.in.sin_port = htons(port);

779

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

759

780

}

760

781

761

782

if(quit_now){

778

799

}

779

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

780

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

781

const char *pcret;

782

802

if(af == AF_INET6){

783

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

784

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

785

807

} else {

786

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

787

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

788

812

}

789

if(pcret == NULL){

790

perror_plus("inet_ntop");

791

} else {

792

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

793

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

794

}

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);

795

819

}

796

820

}

797

821

801

825

}

802

826

803

827

if(af == AF_INET6){

804

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

828

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

829

sizeof(struct sockaddr_in6));

805

830

} else {

806

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

831

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

832

sizeof(struct sockaddr_in));

807

833

}

808

834

if(ret < 0){

809

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

835

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

810

836

int e = errno;

811

837

perror_plus("connect");

812

838

errno = e;

1027

1053

return retval;

1028

1054

}

1029

1055

1056

__attribute__((nonnull))

1030

1057

static void resolve_callback(AvahiSServiceResolver *r,

1031

1058

AvahiIfIndex interface,

1032

1059

AvahiProtocol proto,

1040

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1041

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1042

1069

flags,

1043

void* mc){

1070

void *mc){

1044

1071

if(r == NULL){

1045

1072

return;

1046

1073

}

1049

1076

timed out */

1050

1077

1051

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1052

1080

return;

1053

1081

}

1054

1082

1099

1127

const char *domain,

1100

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1101

1129

flags,

1102

void* mc){

1130

void *mc){

1103

1131

if(b == NULL){

1104

1132

return;

1105

1133

}

1165

1193

errno = old_errno;

1166

1194

}

1167

1195

1196

__attribute__((nonnull, warn_unused_result))

1168

1197

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

1169

1198

int ret;

1170

1199

error_t ret_errno;

1189

1218

return true;

1190

1219

}

1191

1220

1221

__attribute__((nonnull, warn_unused_result))

1192

1222

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

1193

1223

1194

1224

/* Reject the loopback device */

1236

1266

* corresponds to an acceptable network device.

1237

1267

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

1238

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1239

1270

int good_interface(const struct dirent *if_entry){

1240

1271

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

1241

1272

return 0;

1259

1290

/*

1260

1291

* This function determines if a network interface is up.

1261

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1262

1294

bool interface_is_up(const char *interface){

1263

1295

struct ifreq ifr;

1264

1296

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

1275

1307

/*

1276

1308

* This function determines if a network interface is running

1277

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1278

1311

bool interface_is_running(const char *interface){

1279

1312

struct ifreq ifr;

1280

1313

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

1288

1321

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

1289

1322

}

1290

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1291

1325

int notdotentries(const struct dirent *direntry){

1292

1326

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

1293

1327

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

1300

1334

}

1301

1335

1302

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1303

1338

int runnable_hook(const struct dirent *direntry){

1304

1339

int ret;

1305

1340

size_t sret;

1313

1348

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

1314

1349

"abcdefghijklmnopqrstuvwxyz"

1315

1350

"0123456789"

1316

"_-");

1351

"_.-");

1317

1352

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

1318

1353

/* Contains non-allowed characters */

1319

1354

if(debug){

1323

1358

return 0;

1324

1359

}

1325

1360

1326

char *fullname = NULL;

1327

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

1328

if(ret < 0){

1329

perror_plus("asprintf");

1330

return 0;

1331

}

1332

1333

ret = stat(fullname, &st);

1361

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

1334

1362

if(ret == -1){

1335

1363

if(debug){

1336

1364

perror_plus("Could not stat hook");

1360

1388

return 1;

1361

1389

}

1362

1390

1391

__attribute__((nonnull, warn_unused_result))

1363

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1364

1393

mandos_context *mc){

1365

1394

int ret;

1369

1398

1370

1399

while(true){

1371

1400

if(mc->current_server == NULL){

1372

if (debug){

1401

if(debug){

1373

1402

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

1374

1403

" No timeout!\n");

1375

1404

}

1376

1405

ret = avahi_simple_poll_iterate(s, -1);

1377

1406

} else {

1378

if (debug){

1407

if(debug){

1379

1408

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

1380

1409

" it, or wait\n");

1381

1410

}

1398

1427

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

1399

1428

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

1400

1429

1401

if (debug){

1430

if(debug){

1402

1431

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

1403

1432

block_time);

1404

1433

}

1426

1455

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

1427

1456

}

1428

1457

if(ret != 0){

1429

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

1458

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

1430

1459

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

1431

1460

}

1432

1461

}

1434

1463

}

1435

1464

1436

1465

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

1466

__attribute__((warn_unused_result))

1437

1467

error_t raise_privileges(void){

1438

1468

error_t old_errno = errno;

1439

1469

error_t ret_errno = 0;

1440

1470

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

1441

1471

ret_errno = errno;

1442

perror_plus("seteuid");

1443

1472

}

1444

1473

errno = old_errno;

1445

1474

return ret_errno;

1446

1475

}

1447

1476

1448

1477

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

1478

__attribute__((warn_unused_result))

1449

1479

error_t raise_privileges_permanently(void){

1450

1480

error_t old_errno = errno;

1451

1481

error_t ret_errno = raise_privileges();

1455

1485

}

1456

1486

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

1457

1487

ret_errno = errno;

1458

perror_plus("seteuid");

1459

1488

}

1460

1489

errno = old_errno;

1461

1490

return ret_errno;

1462

1491

}

1463

1492

1464

1493

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

1494

__attribute__((warn_unused_result))

1465

1495

error_t lower_privileges(void){

1466

1496

error_t old_errno = errno;

1467

1497

error_t ret_errno = 0;

1468

1498

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

1469

1499

ret_errno = errno;

1470

perror_plus("seteuid");

1471

1500

}

1472

1501

errno = old_errno;

1473

1502

return ret_errno;

1474

1503

}

1475

1504

1476

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1477

1507

error_t lower_privileges_permanently(void){

1478

1508

error_t old_errno = errno;

1479

1509

error_t ret_errno = 0;

1480

1510

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

1481

1511

ret_errno = errno;

1482

perror_plus("setuid");

1483

1512

}

1484

1513

errno = old_errno;

1485

1514

return ret_errno;

1486

1515

}

1487

1516

1488

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

1517

__attribute__((nonnull))

1518

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

1489

1519

const float delay){

1490

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

}

1491

1551

struct dirent *direntry;

1492

1552

int ret;

1493

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

1494

alphasort);

1495

if(numhooks == -1){

1496

if(errno == ENOENT){

1497

if(debug){

1498

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

1499

" found\n", hookdir);

1500

}

1501

} else {

1502

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);

1503

1559

}

1504

} else {

1505

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

1506

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

1507

direntry = direntries[i];

1508

char *fullname = NULL;

1509

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

1510

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){

1511

1621

perror_plus("asprintf");

1512

continue;

1513

}

1514

if(debug){

1515

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

1516

direntry->d_name);

1517

}

1518

pid_t hook_pid = fork();

1519

if(hook_pid == 0){

1520

/* Child */

1521

/* Raise privileges */

1522

raise_privileges_permanently();

1523

/* Set group */

1524

errno = 0;

1525

ret = setgid(0);

1526

if(ret == -1){

1527

perror_plus("setgid");

1528

}

1529

/* Reset supplementary groups */

1530

errno = 0;

1531

ret = setgroups(0, NULL);

1532

if(ret == -1){

1533

perror_plus("setgroups");

1534

}

1535

dup2(devnull, STDIN_FILENO);

1536

close(devnull);

1537

dup2(STDERR_FILENO, STDOUT_FILENO);

1538

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

1539

if(ret == -1){

1540

perror_plus("setenv");

1541

_exit(EX_OSERR);

1542

}

1543

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

1544

if(ret == -1){

1545

perror_plus("setenv");

1546

_exit(EX_OSERR);

1547

}

1548

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

1549

if(ret == -1){

1550

perror_plus("setenv");

1551

_exit(EX_OSERR);

1552

}

1553

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

1554

if(ret == -1){

1555

perror_plus("setenv");

1556

_exit(EX_OSERR);

1557

}

1558

char *delaystring;

1559

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

1560

if(ret == -1){

1561

perror_plus("asprintf");

1562

_exit(EX_OSERR);

1563

}

1564

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

1565

if(ret == -1){

1566

free(delaystring);

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1570

1626

free(delaystring);

1571

if(connect_to != NULL){

1572

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

1573

if(ret == -1){

1574

perror_plus("setenv");

1575

_exit(EX_OSERR);

1576

}

1577

}

1578

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

1579

perror_plus("execl");

1580

_exit(EXIT_FAILURE);

1581

}

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;

1582

1678

} else {

1583

int status;

1584

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

1585

perror_plus("waitpid");

1586

free(fullname);

1587

continue;

1588

}

1589

if(WIFEXITED(status)){

1590

if(WEXITSTATUS(status) != 0){

1591

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

1592

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

1593

WEXITSTATUS(status));

1594

free(fullname);

1595

continue;

1596

}

1597

} else if(WIFSIGNALED(status)){

1598

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

1599

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

1600

WTERMSIG(status));

1601

free(fullname);

1602

continue;

1603

} else {

1604

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

1605

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

1606

free(fullname);

1607

continue;

1608

}

1609

}

1610

free(fullname);

1611

if(debug){

1612

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

1613

direntry->d_name);

1614

}

1615

}

1616

close(devnull);

1617

}

1618

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);

1619

1698

}

1620

1699

1700

__attribute__((nonnull, warn_unused_result))

1621

1701

error_t bring_up_interface(const char *const interface,

1622

1702

const float delay){

1623

int sd = -1;

1624

1703

error_t old_errno = errno;

1625

error_t ret_errno = 0;

1626

int ret, ret_setflags;

1704

int ret;

1627

1705

struct ifreq network;

1628

1706

unsigned int if_index = if_nametoindex(interface);

1629

1707

if(if_index == 0){

1638

1716

}

1639

1717

1640

1718

if(not interface_is_up(interface)){

1641

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

1719

error_t ret_errno = 0, ioctl_errno = 0;

1720

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

1642

1721

ret_errno = errno;

1643

1722

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

1644

1723

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

1724

errno = old_errno;

1645

1725

return ret_errno;

1646

1726

}

1647

network.ifr_flags |= IFF_UP;

1727

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

1648

1728

1649

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1650

if(sd < 0){

1729

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

1730

if(sd == -1){

1651

1731

ret_errno = errno;

1652

1732

perror_plus("socket");

1653

1733

errno = old_errno;

1654

1734

return ret_errno;

1655

1735

}

1656

1736

1657

1737

if(quit_now){

1658

close(sd);

1738

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

1739

if(ret == -1){

1740

perror_plus("close");

1741

}

1659

1742

errno = old_errno;

1660

1743

return EINTR;

1661

1744

}

1665

1748

interface);

1666

1749

}

1667

1750

1668

/* Raise priviliges */

1669

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

}

1670

1757

1671

1758

#ifdef __linux__

1672

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1673

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

1674

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

1675

bool restore_loglevel = true;

1676

if(ret_linux == -1){

1677

restore_loglevel = false;

1678

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

}

1679

1770

}

1680

1771

#endif /* __linux__ */

1681

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

1682

ret_errno = errno;

1772

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

1773

ioctl_errno = errno;

1683

1774

#ifdef __linux__

1684

1775

if(restore_loglevel){

1685

1776

ret_linux = klogctl(7, NULL, 0);

1689

1780

}

1690

1781

#endif /* __linux__ */

1691

1782

1692

/* Lower privileges */

1693

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

}

1694

1792

1695

1793

/* Close the socket */

1696

1794

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

1699

1797

}

1700

1798

1701

1799

if(ret_setflags == -1){

1702

errno = ret_errno;

1800

errno = ioctl_errno;

1703

1801

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1704

1802

errno = old_errno;

1705

return ret_errno;

1803

return ioctl_errno;

1706

1804

}

1707

1805

} else if(debug){

1708

1806

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

1726

1824

return 0;

1727

1825

}

1728

1826

1827

__attribute__((nonnull, warn_unused_result))

1729

1828

error_t take_down_interface(const char *const interface){

1730

int sd = -1;

1731

1829

error_t old_errno = errno;

1732

error_t ret_errno = 0;

1733

int ret, ret_setflags;

1734

1830

struct ifreq network;

1735

1831

unsigned int if_index = if_nametoindex(interface);

1736

1832

if(if_index == 0){

1739

1835

return ENXIO;

1740

1836

}

1741

1837

if(interface_is_up(interface)){

1838

error_t ret_errno = 0, ioctl_errno = 0;

1742

1839

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

1743

1840

ret_errno = errno;

1744

1841

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

1745

1842

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

1843

errno = old_errno;

1746

1844

return ret_errno;

1747

1845

}

1748

1846

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

1749

1847

1750

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1751

if(sd < 0){

1848

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

1849

if(sd == -1){

1752

1850

ret_errno = errno;

1753

1851

perror_plus("socket");

1754

1852

errno = old_errno;

1760

1858

interface);

1761

1859

}

1762

1860

1763

/* Raise priviliges */

1764

raise_privileges();

1765

1766

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

1767

ret_errno = errno;

1768

1769

/* Lower privileges */

1770

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

}

1771

1880

1772

1881

/* Close the socket */

1773

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

1882

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

1774

1883

if(ret == -1){

1775

1884

perror_plus("close");

1776

1885

}

1777

1886

1778

1887

if(ret_setflags == -1){

1779

errno = ret_errno;

1888

errno = ioctl_errno;

1780

1889

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1781

1890

errno = old_errno;

1782

return ret_errno;

1891

return ioctl_errno;

1783

1892

}

1784

1893

} else if(debug){

1785

1894

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

1793

1902

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

1794

1903

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

1795

1904

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

1796

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

1905

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

1797

1906

.interfaces = NULL, .interfaces_size = 0 };

1798

1907

AvahiSServiceBrowser *sb = NULL;

1799

1908

error_t ret_errno;

1803

1912

int exitcode = EXIT_SUCCESS;

1804

1913

char *interfaces_to_take_down = NULL;

1805

1914

size_t interfaces_to_take_down_size = 0;

1806

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

1807

bool tempdir_created = false;

1915

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

1916

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

1917

char *tempdir = NULL;

1808

1918

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1809

1919

const char *seckey = PATHDIR "/" SECKEY;

1810

1920

const char *pubkey = PATHDIR "/" PUBKEY;

1811

1921

char *interfaces_hooks = NULL;

1812

size_t interfaces_hooks_size = 0;

1813

1922

1814

1923

bool gnutls_initialized = false;

1815

1924

bool gpgme_initialized = false;

1993

2102

/* Work around Debian bug #633582:

1994

2103

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

1995

2104

1996

/* Re-raise priviliges */

1997

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 {

1998

2111

struct stat st;

1999

2112

2000

2113

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

2040

2153

}

2041

2154

2042

2155

/* Lower privileges */

2043

lower_privileges();

2156

ret_errno = lower_privileges();

2157

if(ret_errno != 0){

2158

errno = ret_errno;

2159

perror_plus("Failed to lower privileges");

2160

}

2044

2161

}

2045

2162

}

2046

2163

2070

2187

goto end;

2071

2188

}

2072

2189

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

2073

interfaces_hooks_size = mc.interfaces_size;

2074

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2075

(int)',');

2076

}

2077

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

2078

interfaces_hooks : "", delay)){

2079

goto end;

2080

}

2190

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

2191

}

2192

run_network_hooks("start", interfaces_hooks != NULL ?

2193

interfaces_hooks : "", delay);

2081

2194

}

2082

2195

2083

2196

if(not debug){

2161

2274

2162

2275

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

2163

2276

if(mc.interfaces == NULL){

2164

struct dirent **direntries;

2277

struct dirent **direntries = NULL;

2165

2278

/* Look for any good interfaces */

2166

2279

ret = scandir(sys_class_net, &direntries, good_interface,

2167

2280

alphasort);

2171

2284

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

2172

2285

direntries[i]->d_name);

2173

2286

if(ret_errno != 0){

2287

errno = ret_errno;

2174

2288

perror_plus("argz_add");

2289

free(direntries[i]);

2175

2290

continue;

2176

2291

}

2177

2292

if(debug){

2178

2293

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

2179

2294

direntries[i]->d_name);

2180

2295

}

2296

free(direntries[i]);

2181

2297

}

2182

2298

free(direntries);

2183

2299

} else {

2184

free(direntries);

2300

if(ret == 0){

2301

free(direntries);

2302

}

2185

2303

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

2186

2304

exitcode = EXIT_FAILURE;

2187

2305

goto end;

2210

2328

break;

2211

2329

}

2212

2330

bool interface_was_up = interface_is_up(interface);

2213

ret = bring_up_interface(interface, delay);

2331

errno = bring_up_interface(interface, delay);

2214

2332

if(not interface_was_up){

2215

if(ret != 0){

2216

errno = ret;

2333

if(errno != 0){

2217

2334

perror_plus("Failed to bring up interface");

2218

2335

} else {

2219

ret_errno = argz_add(&interfaces_to_take_down,

2220

&interfaces_to_take_down_size,

2221

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

}

2222

2342

}

2223

2343

}

2224

2344

}

2253

2373

goto end;

2254

2374

}

2255

2375

2256

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){

2257

2386

perror_plus("mkdtemp");

2258

2387

goto end;

2259

2388

}

2260

tempdir_created = true;

2261

2389

2262

2390

if(quit_now){

2263

2391

goto end;

2338

2466

sleep((unsigned int)retry_interval);

2339

2467

}

2340

2468

2341

if (not quit_now){

2469

if(not quit_now){

2342

2470

exitcode = EXIT_SUCCESS;

2343

2471

}

2344

2472

2399

2527

if(debug){

2400

2528

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

2401

2529

}

2402

2530

2403

2531

ret = avahi_loop_with_timeout(simple_poll,

2404

2532

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

2405

2533

if(debug){

2441

2569

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

2442

2570

while(mc.current_server != NULL){

2443

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

2444

2580

free(mc.current_server);

2445

2581

mc.current_server = next;

2446

2582

}

2447

2583

}

2448

2584

2449

/* Re-raise priviliges */

2585

/* Re-raise privileges */

2450

2586

{

2451

raise_privileges();

2452

2453

/* Run network hooks */

2454

run_network_hooks("stop", interfaces_hooks != NULL ?

2455

interfaces_hooks : "", delay);

2456

2457

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

2458

{

2459

char *interface = NULL;

2460

while((interface=argz_next(interfaces_to_take_down,

2461

interfaces_to_take_down_size,

2462

interface))){

2463

ret_errno = take_down_interface(interface);

2464

if(ret_errno != 0){

2465

errno = ret_errno;

2466

perror_plus("Failed to take down interface");

2467

}

2468

}

2469

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

2470

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

2471

" down\n");

2472

}

2473

}

2474

2475

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

}

2476

2621

}

2477

2622

2478

2623

free(interfaces_to_take_down);

2479

2624

free(interfaces_hooks);

2480

2625

2481

2626

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

2482

if(tempdir_created){

2627

if(tempdir != NULL){

2483

2628

struct dirent **direntries = NULL;

2484

struct dirent *direntry = NULL;

2485

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

2486

alphasort);

2487

if (numentries > 0){

2488

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

2489

direntry = direntries[i];

2490

char *fullname = NULL;

2491

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

2492

direntry->d_name);

2493

if(ret < 0){

2494

perror_plus("asprintf");

2495

continue;

2496

}

2497

ret = remove(fullname);

2498

if(ret == -1){

2499

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

2500

strerror(errno));

2501

}

2502

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

}

2503

2666

}

2504

}

2505

2506

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

2507

free(direntries);

2508

if (numentries == -1){

2509

perror_plus("scandir");

2510

}

2511

ret = rmdir(tempdir);

2512

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

2513

perror_plus("rmdir");

2667

TEMP_FAILURE_RETRY(close(tempdir_fd));

2514

2668

}

2515

2669

}

2516

2670