/mandos/trunk : revision 614

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 /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

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

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

73

72

*/

74

73

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

75

74

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

76

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

77

unlinkat() */

78

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

75

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

76

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

79

77

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

80

78

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

81

79

argp_state, struct argp,

93

91

argz_delete(), argz_append(),

94

92

argz_stringify(), argz_add(),

95

93

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

94

99

95

#ifdef __linux__

100

96

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

142

138

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

143

139

char *connect_to = NULL;

144

140

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

141

uid_t uid = 65534;

147

142

gid_t gid = 65534;

148

143

185

180

perror(print_text);

186

181

}

187

182

188

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

183

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

189

184

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

190

185

va_list ap;

191

186

va_start (ap, format);

192

187

193

188

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

194

189

program_invocation_short_name));

195

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

190

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

196

191

}

197

192

198

193

/*

200

195

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

201

196

* "buffer_length" is how much is already used.

202

197

*/

203

__attribute__((nonnull, warn_unused_result))

204

198

size_t incbuffer(char **buffer, size_t buffer_length,

205

199

size_t buffer_capacity){

206

200

if(buffer_length + BUFFER_SIZE > buffer_capacity){

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;

201

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

202

if(buffer == NULL){

213

203

return 0;

214

204

}

215

*buffer = new_buf;

216

205

buffer_capacity += BUFFER_SIZE;

217

206

}

218

207

return buffer_capacity;

219

208

}

220

209

221

210

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

222

__attribute__((nonnull, warn_unused_result))

223

211

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

224

212

int af, server **current_server){

225

213

int ret;

234

222

.af = af };

235

223

if(new_server->ip == NULL){

236

224

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);

252

225

return false;

253

226

}

254

227

/* Special case of first server */

256

229

new_server->next = new_server;

257

230

new_server->prev = new_server;

258

231

*current_server = new_server;

232

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

259

233

} else {

260

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

261

234

new_server->next = *current_server;

262

235

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

263

236

new_server->prev->next = new_server;

264

237

(*current_server)->prev = new_server;

265

238

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

266

244

return true;

267

245

}

268

246

269

247

/*

270

248

* Initialize GPGME.

271

249

*/

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){

250

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

251

const char *tempdir, mandos_context *mc){

277

252

gpgme_error_t rc;

278

253

gpgme_engine_info_t engine_info;

279

254

280

255

/*

281

256

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

282

257

*/

283

bool import_key(const char * const filename){

258

bool import_key(const char *filename){

284

259

int ret;

285

260

int fd;

286

261

gpgme_data_t pgp_data;

367

342

* Decrypt OpenPGP data.

368

343

* Returns -1 on error

369

344

*/

370

__attribute__((nonnull, warn_unused_result))

371

345

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

346

size_t crypto_size,

373

347

char **plaintext,

493

467

return plaintext_length;

494

468

}

495

469

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

470

static const char * safer_gnutls_strerror(int value){

498

471

const char *ret = gnutls_strerror(value);

499

472

if(ret == NULL)

500

473

ret = "(unknown)";

502

475

}

503

476

504

477

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

478

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

507

479

const char* string){

508

480

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

509

481

}

510

482

511

__attribute__((nonnull, warn_unused_result))

512

483

static int init_gnutls_global(const char *pubkeyfilename,

513

484

const char *seckeyfilename,

514

485

mandos_context *mc){

588

559

return -1;

589

560

}

590

561

591

__attribute__((nonnull, warn_unused_result))

592

562

static int init_gnutls_session(gnutls_session_t *session,

593

563

mandos_context *mc){

594

564

int ret;

651

621

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

652

622

653

623

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

624

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

656

625

AvahiIfIndex if_index,

657

626

int af, mandos_context *mc){

658

627

int ret, tcp_sd = -1;

659

628

ssize_t sret;

660

struct sockaddr_storage to;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

661

633

char *buffer = NULL;

662

634

char *decrypted_buffer = NULL;

663

635

size_t buffer_length = 0;

744

716

745

717

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

746

718

if(af == AF_INET6){

747

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

748

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

719

to.in6.sin6_family = (sa_family_t)af;

720

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

749

721

} else { /* IPv4 */

750

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

751

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

722

to.in.sin_family = (sa_family_t)af;

723

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

752

724

}

753

725

if(ret < 0 ){

754

726

int e = errno;

763

735

goto mandos_end;

764

736

}

765

737

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

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*/

769

742

if(if_index == AVAHI_IF_UNSPEC){

770

743

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

771

744

" incomplete without a network interface\n");

773

746

goto mandos_end;

774

747

}

775

748

/* Set the network interface number as scope */

776

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

749

to.in6.sin6_scope_id = (uint32_t)if_index;

777

750

}

778

751

} else {

779

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

752

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

753

-Wconversion and

754

-Wunreachable-code */

780

755

}

781

756

782

757

if(quit_now){

799

774

}

800

775

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

776

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

777

const char *pcret;

802

778

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

779

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

780

sizeof(addrstr));

807

781

} else {

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

782

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

783

sizeof(addrstr));

812

784

}

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);

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

}

819

791

}

820

792

}

821

793

825

797

}

826

798

827

799

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

800

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

830

801

} else {

831

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

832

sizeof(struct sockaddr_in));

802

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

833

803

}

834

804

if(ret < 0){

835

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

805

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

836

806

int e = errno;

837

807

perror_plus("connect");

838

808

errno = e;

1053

1023

return retval;

1054

1024

}

1055

1025

1056

__attribute__((nonnull))

1057

1026

static void resolve_callback(AvahiSServiceResolver *r,

1058

1027

AvahiIfIndex interface,

1059

1028

AvahiProtocol proto,

1067

1036

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

1037

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

1038

flags,

1070

void *mc){

1039

void* mc){

1071

1040

if(r == NULL){

1072

1041

return;

1073

1042

}

1126

1095

const char *domain,

1127

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1128

1097

flags,

1129

void *mc){

1098

void* mc){

1130

1099

if(b == NULL){

1131

1100

return;

1132

1101

}

1192

1161

errno = old_errno;

1193

1162

}

1194

1163

1195

__attribute__((nonnull, warn_unused_result))

1196

1164

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

1197

1165

int ret;

1198

1166

error_t ret_errno;

1217

1185

return true;

1218

1186

}

1219

1187

1220

__attribute__((nonnull, warn_unused_result))

1221

1188

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

1222

1189

1223

1190

/* Reject the loopback device */

1265

1232

* corresponds to an acceptable network device.

1266

1233

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

1267

1234

*/

1268

__attribute__((nonnull, warn_unused_result))

1269

1235

int good_interface(const struct dirent *if_entry){

1270

1236

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

1271

1237

return 0;

1289

1255

/*

1290

1256

* This function determines if a network interface is up.

1291

1257

*/

1292

__attribute__((nonnull, warn_unused_result))

1293

1258

bool interface_is_up(const char *interface){

1294

1259

struct ifreq ifr;

1295

1260

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

1306

1271

/*

1307

1272

* This function determines if a network interface is running

1308

1273

*/

1309

__attribute__((nonnull, warn_unused_result))

1310

1274

bool interface_is_running(const char *interface){

1311

1275

struct ifreq ifr;

1312

1276

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

1320

1284

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

1321

1285

}

1322

1286

1323

__attribute__((nonnull, pure, warn_unused_result))

1324

1287

int notdotentries(const struct dirent *direntry){

1325

1288

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

1326

1289

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

1333

1296

}

1334

1297

1335

1298

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

1336

__attribute__((nonnull, warn_unused_result))

1337

1299

int runnable_hook(const struct dirent *direntry){

1338

1300

int ret;

1339

1301

size_t sret;

1347

1309

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

1348

1310

"abcdefghijklmnopqrstuvwxyz"

1349

1311

"0123456789"

1350

"_.-");

1312

"_-");

1351

1313

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

1352

1314

/* Contains non-allowed characters */

1353

1315

if(debug){

1357

1319

return 0;

1358

1320

}

1359

1321

1360

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

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

1330

if(ret == -1){

1362

1331

if(debug){

1363

1332

perror_plus("Could not stat hook");

1387

1356

return 1;

1388

1357

}

1389

1358

1390

__attribute__((nonnull, warn_unused_result))

1391

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1392

1360

mandos_context *mc){

1393

1361

int ret;

1397

1365

1398

1366

while(true){

1399

1367

if(mc->current_server == NULL){

1400

if(debug){

1368

if (debug){

1401

1369

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

1402

1370

" No timeout!\n");

1403

1371

}

1404

1372

ret = avahi_simple_poll_iterate(s, -1);

1405

1373

} else {

1406

if(debug){

1374

if (debug){

1407

1375

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

1408

1376

" it, or wait\n");

1409

1377

}

1426

1394

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

1427

1395

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

1428

1396

1429

if(debug){

1397

if (debug){

1430

1398

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

1431

1399

block_time);

1432

1400

}

1454

1422

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

1455

1423

}

1456

1424

if(ret != 0){

1457

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

1425

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

1458

1426

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

1459

1427

}

1460

1428

}

1462

1430

}

1463

1431

1464

1432

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

1465

__attribute__((warn_unused_result))

1466

1433

error_t raise_privileges(void){

1467

1434

error_t old_errno = errno;

1468

1435

error_t ret_errno = 0;

1469

1436

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

1470

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1471

1439

}

1472

1440

errno = old_errno;

1473

1441

return ret_errno;

1474

1442

}

1475

1443

1476

1444

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

1477

__attribute__((warn_unused_result))

1478

1445

error_t raise_privileges_permanently(void){

1479

1446

error_t old_errno = errno;

1480

1447

error_t ret_errno = raise_privileges();

1484

1451

}

1485

1452

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

1486

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1487

1455

}

1488

1456

errno = old_errno;

1489

1457

return ret_errno;

1490

1458

}

1491

1459

1492

1460

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

1493

__attribute__((warn_unused_result))

1494

1461

error_t lower_privileges(void){

1495

1462

error_t old_errno = errno;

1496

1463

error_t ret_errno = 0;

1497

1464

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

1498

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1499

1467

}

1500

1468

errno = old_errno;

1501

1469

return ret_errno;

1502

1470

}

1503

1471

1504

1472

/* Lower privileges permanently */

1505

__attribute__((warn_unused_result))

1506

1473

error_t lower_privileges_permanently(void){

1507

1474

error_t old_errno = errno;

1508

1475

error_t ret_errno = 0;

1509

1476

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

1510

1477

ret_errno = errno;

1478

perror_plus("setuid");

1511

1479

}

1512

1480

errno = old_errno;

1513

1481

return ret_errno;

1514

1482

}

1515

1483

1516

__attribute__((nonnull))

1517

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

1484

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

1518

1485

const float delay){

1519

struct dirent **direntries = NULL;

1520

if(hookdir_fd == -1){

1521

hookdir_fd = open(hookdir, O_RDONLY);

1522

if(hookdir_fd == -1){

1523

if(errno == ENOENT){

1524

if(debug){

1525

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

1526

" found\n", hookdir);

1527

}

1528

} else {

1529

perror_plus("open");

1530

}

1531

return;

1532

}

1533

}

1534

#ifdef __GLIBC__

1535

#if __GLIBC_PREREQ(2, 15)

1536

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

1537

runnable_hook, alphasort);

1538

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

1539

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

1540

alphasort);

1541

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

1542

#else /* not __GLIBC__ */

1543

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

1544

alphasort);

1545

#endif /* not __GLIBC__ */

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1546

1491

if(numhooks == -1){

1547

perror_plus("scandir");

1548

return;

1549

}

1550

struct dirent *direntry;

1551

int ret;

1552

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

1553

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

1554

direntry = direntries[i];

1555

if(debug){

1556

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

1557

direntry->d_name);

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");

1558

1499

}

1559

pid_t hook_pid = fork();

1560

if(hook_pid == 0){

1561

/* Child */

1562

/* Raise privileges */

1563

errno = raise_privileges_permanently();

1564

if(errno != 0){

1565

perror_plus("Failed to raise privileges");

1566

_exit(EX_NOPERM);

1567

}

1568

/* Set group */

1569

errno = 0;

1570

ret = setgid(0);

1571

if(ret == -1){

1572

perror_plus("setgid");

1573

_exit(EX_NOPERM);

1574

}

1575

/* Reset supplementary groups */

1576

errno = 0;

1577

ret = setgroups(0, NULL);

1578

if(ret == -1){

1579

perror_plus("setgroups");

1580

_exit(EX_NOPERM);

1581

}

1582

ret = dup2(devnull, STDIN_FILENO);

1583

if(ret == -1){

1584

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

1585

_exit(EX_OSERR);

1586

}

1587

ret = close(devnull);

1588

if(ret == -1){

1589

perror_plus("close");

1590

_exit(EX_OSERR);

1591

}

1592

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1593

if(ret == -1){

1594

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

1595

_exit(EX_OSERR);

1596

}

1597

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

1598

if(ret == -1){

1599

perror_plus("setenv");

1600

_exit(EX_OSERR);

1601

}

1602

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

1603

if(ret == -1){

1604

perror_plus("setenv");

1605

_exit(EX_OSERR);

1606

}

1607

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

1608

if(ret == -1){

1609

perror_plus("setenv");

1610

_exit(EX_OSERR);

1611

}

1612

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

1613

if(ret == -1){

1614

perror_plus("setenv");

1615

_exit(EX_OSERR);

1616

}

1617

char *delaystring;

1618

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

1619

if(ret == -1){

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){

1620

1507

perror_plus("asprintf");

1621

_exit(EX_OSERR);

1622

}

1623

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

1624

if(ret == -1){

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

}

1625

1566

free(delaystring);

1626

perror_plus("setenv");

1627

_exit(EX_OSERR);

1628

}

1629

free(delaystring);

1630

if(connect_to != NULL){

1631

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

1632

if(ret == -1){

1633

perror_plus("setenv");

1634

_exit(EX_OSERR);

1635

}

1636

}

1637

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

1638

if(hook_fd == -1){

1639

perror_plus("openat");

1640

_exit(EXIT_FAILURE);

1641

}

1642

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

1643

perror_plus("close");

1644

_exit(EXIT_FAILURE);

1645

}

1646

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

1647

environ) == -1){

1648

perror_plus("fexecve");

1649

_exit(EXIT_FAILURE);

1650

}

1651

} else {

1652

int status;

1653

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

1654

perror_plus("waitpid");

1655

continue;

1656

}

1657

if(WIFEXITED(status)){

1658

if(WEXITSTATUS(status) != 0){

1659

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

1660

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

1661

WEXITSTATUS(status));

1662

continue;

1663

}

1664

} else if(WIFSIGNALED(status)){

1665

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

1666

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

1667

WTERMSIG(status));

1668

continue;

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

}

1669

1578

} else {

1670

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

1671

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

1672

continue;

1673

}

1674

}

1675

if(debug){

1676

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

1677

direntry->d_name);

1678

}

1679

}

1680

free(direntries);

1681

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

1682

perror_plus("close");

1683

} else {

1684

hookdir_fd = -1;

1685

}

1686

close(devnull);

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;

1687

1615

}

1688

1616

1689

__attribute__((nonnull, warn_unused_result))

1690

1617

error_t bring_up_interface(const char *const interface,

1691

1618

const float delay){

1619

int sd = -1;

1692

1620

error_t old_errno = errno;

1693

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1694

1623

struct ifreq network;

1695

1624

unsigned int if_index = if_nametoindex(interface);

1696

1625

if(if_index == 0){

1705

1634

}

1706

1635

1707

1636

if(not interface_is_up(interface)){

1708

error_t ret_errno = 0, ioctl_errno = 0;

1709

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

1637

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

1710

1638

ret_errno = errno;

1711

1639

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

1712

1640

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

1713

errno = old_errno;

1714

1641

return ret_errno;

1715

1642

}

1716

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

1643

network.ifr_flags |= IFF_UP;

1717

1644

1718

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

1719

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1720

1647

ret_errno = errno;

1721

1648

perror_plus("socket");

1722

1649

errno = old_errno;

1723

1650

return ret_errno;

1724

1651

}

1725

1652

1726

1653

if(quit_now){

1727

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

1728

if(ret == -1){

1729

perror_plus("close");

1730

}

1654

close(sd);

1731

1655

errno = old_errno;

1732

1656

return EINTR;

1733

1657

}

1737

1661

interface);

1738

1662

}

1739

1663

1740

/* Raise privileges */

1741

ret_errno = raise_privileges();

1742

if(ret_errno != 0){

1743

errno = ret_errno;

1744

perror_plus("Failed to raise privileges");

1745

}

1664

/* Raise priviliges */

1665

raise_privileges();

1746

1666

1747

1667

#ifdef __linux__

1748

int ret_linux;

1749

bool restore_loglevel = false;

1750

if(ret_errno == 0){

1751

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1752

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

1753

ret_linux = klogctl(8, NULL, 5);

1754

if(ret_linux == -1){

1755

perror_plus("klogctl");

1756

} else {

1757

restore_loglevel = true;

1758

}

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

1675

}

1760

1676

#endif /* __linux__ */

1761

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

1762

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

1763

1679

#ifdef __linux__

1764

1680

if(restore_loglevel){

1765

1681

ret_linux = klogctl(7, NULL, 0);

1769

1685

}

1770

1686

#endif /* __linux__ */

1771

1687

1772

/* If raise_privileges() succeeded above */

1773

if(ret_errno == 0){

1774

/* Lower privileges */

1775

ret_errno = lower_privileges();

1776

if(ret_errno != 0){

1777

errno = ret_errno;

1778

perror_plus("Failed to lower privileges");

1779

}

1780

}

1688

/* Lower privileges */

1689

lower_privileges();

1781

1690

1782

1691

/* Close the socket */

1783

1692

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

1786

1695

}

1787

1696

1788

1697

if(ret_setflags == -1){

1789

errno = ioctl_errno;

1698

errno = ret_errno;

1790

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1791

1700

errno = old_errno;

1792

return ioctl_errno;

1701

return ret_errno;

1793

1702

}

1794

1703

} else if(debug){

1795

1704

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

1813

1722

return 0;

1814

1723

}

1815

1724

1816

__attribute__((nonnull, warn_unused_result))

1817

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1818

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1819

1730

struct ifreq network;

1820

1731

unsigned int if_index = if_nametoindex(interface);

1821

1732

if(if_index == 0){

1824

1735

return ENXIO;

1825

1736

}

1826

1737

if(interface_is_up(interface)){

1827

error_t ret_errno = 0, ioctl_errno = 0;

1828

1738

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

1829

1739

ret_errno = errno;

1830

1740

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

1831

1741

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

1832

errno = old_errno;

1833

1742

return ret_errno;

1834

1743

}

1835

1744

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

1836

1745

1837

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

1838

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1839

1748

ret_errno = errno;

1840

1749

perror_plus("socket");

1841

1750

errno = old_errno;

1847

1756

interface);

1848

1757

}

1849

1758

1850

/* Raise privileges */

1851

ret_errno = raise_privileges();

1852

if(ret_errno != 0){

1853

errno = ret_errno;

1854

perror_plus("Failed to raise privileges");

1855

}

1856

1857

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

1858

ioctl_errno = errno;

1859

1860

/* If raise_privileges() succeeded above */

1861

if(ret_errno == 0){

1862

/* Lower privileges */

1863

ret_errno = lower_privileges();

1864

if(ret_errno != 0){

1865

errno = ret_errno;

1866

perror_plus("Failed to lower privileges");

1867

}

1868

}

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();

1869

1767

1870

1768

/* Close the socket */

1871

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

1769

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

1872

1770

if(ret == -1){

1873

1771

perror_plus("close");

1874

1772

}

1875

1773

1876

1774

if(ret_setflags == -1){

1877

errno = ioctl_errno;

1775

errno = ret_errno;

1878

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1879

1777

errno = old_errno;

1880

return ioctl_errno;

1778

return ret_errno;

1881

1779

}

1882

1780

} else if(debug){

1883

1781

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

1891

1789

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

1892

1790

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

1893

1791

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

1894

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

1792

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

1895

1793

.interfaces = NULL, .interfaces_size = 0 };

1896

1794

AvahiSServiceBrowser *sb = NULL;

1897

1795

error_t ret_errno;

1901

1799

int exitcode = EXIT_SUCCESS;

1902

1800

char *interfaces_to_take_down = NULL;

1903

1801

size_t interfaces_to_take_down_size = 0;

1904

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

1905

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

1906

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

1907

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1908

1805

const char *seckey = PATHDIR "/" SECKEY;

1909

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1910

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1911

1809

1912

1810

bool gnutls_initialized = false;

1913

1811

bool gpgme_initialized = false;

2091

1989

/* Work around Debian bug #633582:

2092

1990

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

2093

1991

2094

/* Re-raise privileges */

2095

ret_errno = raise_privileges();

2096

if(ret_errno != 0){

2097

errno = ret_errno;

2098

perror_plus("Failed to raise privileges");

2099

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2100

1994

struct stat st;

2101

1995

2102

1996

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

2142

2036

}

2143

2037

2144

2038

/* Lower privileges */

2145

ret_errno = lower_privileges();

2146

if(ret_errno != 0){

2147

errno = ret_errno;

2148

perror_plus("Failed to lower privileges");

2149

}

2039

lower_privileges();

2150

2040

}

2151

2041

}

2152

2042

2176

2066

goto end;

2177

2067

}

2178

2068

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

2179

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

2180

}

2181

run_network_hooks("start", interfaces_hooks != NULL ?

2182

interfaces_hooks : "", delay);

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

}

2183

2077

}

2184

2078

2185

2079

if(not debug){

2263

2157

2264

2158

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

2265

2159

if(mc.interfaces == NULL){

2266

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2267

2161

/* Look for any good interfaces */

2268

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2269

2163

alphasort);

2273

2167

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

2274

2168

direntries[i]->d_name);

2275

2169

if(ret_errno != 0){

2276

errno = ret_errno;

2277

2170

perror_plus("argz_add");

2278

2171

continue;

2279

2172

}

2284

2177

}

2285

2178

free(direntries);

2286

2179

} else {

2287

if(ret == 0){

2288

free(direntries);

2289

}

2180

free(direntries);

2290

2181

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

2291

2182

exitcode = EXIT_FAILURE;

2292

2183

goto end;

2315

2206

break;

2316

2207

}

2317

2208

bool interface_was_up = interface_is_up(interface);

2318

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2319

2210

if(not interface_was_up){

2320

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2321

2213

perror_plus("Failed to bring up interface");

2322

2214

} else {

2323

errno = argz_add(&interfaces_to_take_down,

2324

&interfaces_to_take_down_size,

2325

interface);

2326

if(errno != 0){

2327

perror_plus("argz_add");

2328

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2329

2218

}

2330

2219

}

2331

2220

}

2360

2249

goto end;

2361

2250

}

2362

2251

2363

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

2364

tempdir = mkdtemp(run_tempdir);

2365

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

2366

if(debug){

2367

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

2368

run_tempdir, old_tempdir);

2369

}

2370

tempdir = mkdtemp(old_tempdir);

2371

}

2372

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2373

2253

perror_plus("mkdtemp");

2374

2254

goto end;

2375

2255

}

2256

tempdir_created = true;

2376

2257

2377

2258

if(quit_now){

2378

2259

goto end;

2450

2331

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

2451

2332

(int)retry_interval);

2452

2333

}

2453

sleep((unsigned int)retry_interval);

2334

sleep((int)retry_interval);

2454

2335

}

2455

2336

2456

if(not quit_now){

2337

if (not quit_now){

2457

2338

exitcode = EXIT_SUCCESS;

2458

2339

}

2459

2340

2514

2395

if(debug){

2515

2396

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

2516

2397

}

2517

2398

2518

2399

ret = avahi_loop_with_timeout(simple_poll,

2519

2400

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

2520

2401

if(debug){

2556

2437

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

2557

2438

while(mc.current_server != NULL){

2558

2439

server *next = mc.current_server->next;

2559

#ifdef __GNUC__

2560

#pragma GCC diagnostic push

2561

#pragma GCC diagnostic ignored "-Wcast-qual"

2562

#endif

2563

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

2564

#ifdef __GNUC__

2565

#pragma GCC diagnostic pop

2566

#endif

2567

2440

free(mc.current_server);

2568

2441

mc.current_server = next;

2569

2442

}

2570

2443

}

2571

2444

2572

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2573

2446

{

2574

ret_errno = raise_privileges();

2575

if(ret_errno != 0){

2576

errno = ret_errno;

2577

perror_plus("Failed to raise privileges");

2578

} else {

2579

2580

/* Run network hooks */

2581

run_network_hooks("stop", interfaces_hooks != NULL ?

2582

interfaces_hooks : "", delay);

2583

2584

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

2585

{

2586

char *interface = NULL;

2587

while((interface=argz_next(interfaces_to_take_down,

2588

interfaces_to_take_down_size,

2589

interface))){

2590

ret_errno = take_down_interface(interface);

2591

if(ret_errno != 0){

2592

errno = ret_errno;

2593

perror_plus("Failed to take down interface");

2594

}

2595

}

2596

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

2597

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

2598

" down\n");

2599

}

2600

}

2601

}

2602

2603

ret_errno = lower_privileges_permanently();

2604

if(ret_errno != 0){

2605

errno = ret_errno;

2606

perror_plus("Failed to lower privileges permanently");

2607

}

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();

2608

2472

}

2609

2473

2610

2474

free(interfaces_to_take_down);

2611

2475

free(interfaces_hooks);

2612

2476

2613

2477

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

2614

if(tempdir != NULL){

2478

if(tempdir_created){

2615

2479

struct dirent **direntries = NULL;

2616

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

2617

O_NOFOLLOW));

2618

if(tempdir_fd == -1){

2619

perror_plus("open");

2620

} else {

2621

#ifdef __GLIBC__

2622

#if __GLIBC_PREREQ(2, 15)

2623

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

2624

notdotentries, alphasort);

2625

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

2626

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

2627

alphasort);

2628

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

2629

#else /* not __GLIBC__ */

2630

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

2631

alphasort);

2632

#endif /* not __GLIBC__ */

2633

if(numentries >= 0){

2634

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

2635

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

2636

if(ret == -1){

2637

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

2638

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

2639

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

2640

}

2641

}

2642

2643

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

2644

free(direntries);

2645

if(numentries == -1){

2646

perror_plus("scandir");

2647

}

2648

ret = rmdir(tempdir);

2649

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

2650

perror_plus("rmdir");

2651

}

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);

2652

2499

}

2653

TEMP_FAILURE_RETRY(close(tempdir_fd));

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");

2654

2510

}

2655

2511

}

2656

2512