/mandos/release : revision 306

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);

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

}

1076

1045

timed out */

1077

1046

1078

1047

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1048

return;

1081

1049

}

1082

1050

1127

1095

const char *domain,

1128

1096

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1097

flags,

1130

void *mc){

1098

void* mc){

1131

1099

if(b == NULL){

1132

1100

return;

1133

1101

}

1193

1161

errno = old_errno;

1194

1162

}

1195

1163

1196

__attribute__((nonnull, warn_unused_result))

1197

1164

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

1198

1165

int ret;

1199

1166

error_t ret_errno;

1218

1185

return true;

1219

1186

}

1220

1187

1221

__attribute__((nonnull, warn_unused_result))

1222

1188

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

1223

1189

1224

1190

/* Reject the loopback device */

1266

1232

* corresponds to an acceptable network device.

1267

1233

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

1268

1234

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1235

int good_interface(const struct dirent *if_entry){

1271

1236

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

1272

1237

return 0;

1290

1255

/*

1291

1256

* This function determines if a network interface is up.

1292

1257

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

1258

bool interface_is_up(const char *interface){

1295

1259

struct ifreq ifr;

1296

1260

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

1307

1271

/*

1308

1272

* This function determines if a network interface is running

1309

1273

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

1274

bool interface_is_running(const char *interface){

1312

1275

struct ifreq ifr;

1313

1276

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

1321

1284

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

1322

1285

}

1323

1286

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

1287

int notdotentries(const struct dirent *direntry){

1326

1288

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

1327

1289

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

1334

1296

}

1335

1297

1336

1298

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1299

int runnable_hook(const struct dirent *direntry){

1339

1300

int ret;

1340

1301

size_t sret;

1348

1309

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

1349

1310

"abcdefghijklmnopqrstuvwxyz"

1350

1311

"0123456789"

1351

"_.-");

1312

"_-");

1352

1313

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

1353

1314

/* Contains non-allowed characters */

1354

1315

if(debug){

1358

1319

return 0;

1359

1320

}

1360

1321

1361

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);

1362

1330

if(ret == -1){

1363

1331

if(debug){

1364

1332

perror_plus("Could not stat hook");

1388

1356

return 1;

1389

1357

}

1390

1358

1391

__attribute__((nonnull, warn_unused_result))

1392

1359

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

1360

mandos_context *mc){

1394

1361

int ret;

1398

1365

1399

1366

while(true){

1400

1367

if(mc->current_server == NULL){

1401

if(debug){

1368

if (debug){

1402

1369

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

1403

1370

" No timeout!\n");

1404

1371

}

1405

1372

ret = avahi_simple_poll_iterate(s, -1);

1406

1373

} else {

1407

if(debug){

1374

if (debug){

1408

1375

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

1409

1376

" it, or wait\n");

1410

1377

}

1427

1394

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

1428

1395

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

1429

1396

1430

if(debug){

1397

if (debug){

1431

1398

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

1432

1399

block_time);

1433

1400

}

1455

1422

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

1456

1423

}

1457

1424

if(ret != 0){

1458

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

1425

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

1459

1426

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

1460

1427

}

1461

1428

}

1463

1430

}

1464

1431

1465

1432

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

1466

__attribute__((warn_unused_result))

1467

1433

error_t raise_privileges(void){

1468

1434

error_t old_errno = errno;

1469

1435

error_t ret_errno = 0;

1470

1436

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

1471

1437

ret_errno = errno;

1438

perror_plus("seteuid");

1472

1439

}

1473

1440

errno = old_errno;

1474

1441

return ret_errno;

1475

1442

}

1476

1443

1477

1444

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

1478

__attribute__((warn_unused_result))

1479

1445

error_t raise_privileges_permanently(void){

1480

1446

error_t old_errno = errno;

1481

1447

error_t ret_errno = raise_privileges();

1485

1451

}

1486

1452

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

1487

1453

ret_errno = errno;

1454

perror_plus("seteuid");

1488

1455

}

1489

1456

errno = old_errno;

1490

1457

return ret_errno;

1491

1458

}

1492

1459

1493

1460

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

1494

__attribute__((warn_unused_result))

1495

1461

error_t lower_privileges(void){

1496

1462

error_t old_errno = errno;

1497

1463

error_t ret_errno = 0;

1498

1464

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

1499

1465

ret_errno = errno;

1466

perror_plus("seteuid");

1500

1467

}

1501

1468

errno = old_errno;

1502

1469

return ret_errno;

1503

1470

}

1504

1471

1505

1472

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

1473

error_t lower_privileges_permanently(void){

1508

1474

error_t old_errno = errno;

1509

1475

error_t ret_errno = 0;

1510

1476

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

1511

1477

ret_errno = errno;

1478

perror_plus("setuid");

1512

1479

}

1513

1480

errno = old_errno;

1514

1481

return ret_errno;

1515

1482

}

1516

1483

1517

__attribute__((nonnull))

1518

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

1484

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

1519

1485

const float delay){

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__ */

1486

struct dirent **direntries;

1487

struct dirent *direntry;

1488

int ret;

1489

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

1490

alphasort);

1547

1491

if(numhooks == -1){

1548

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

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);

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");

1559

1499

}

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){

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){

1621

1507

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

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

}

1626

1566

free(delaystring);

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

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

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

}

1673

1578

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

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;

1693

1615

}

1694

1616

1695

__attribute__((nonnull, warn_unused_result))

1696

1617

error_t bring_up_interface(const char *const interface,

1697

1618

const float delay){

1619

int sd = -1;

1698

1620

error_t old_errno = errno;

1699

int ret;

1621

error_t ret_errno = 0;

1622

int ret, ret_setflags;

1700

1623

struct ifreq network;

1701

1624

unsigned int if_index = if_nametoindex(interface);

1702

1625

if(if_index == 0){

1711

1634

}

1712

1635

1713

1636

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1637

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

1716

1638

ret_errno = errno;

1717

1639

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

1718

1640

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

1719

errno = old_errno;

1720

1641

return ret_errno;

1721

1642

}

1722

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

1643

network.ifr_flags |= IFF_UP;

1723

1644

1724

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

1725

if(sd == -1){

1645

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1646

if(sd < 0){

1726

1647

ret_errno = errno;

1727

1648

perror_plus("socket");

1728

1649

errno = old_errno;

1729

1650

return ret_errno;

1730

1651

}

1731

1652

1732

1653

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1654

close(sd);

1737

1655

errno = old_errno;

1738

1656

return EINTR;

1739

1657

}

1743

1661

interface);

1744

1662

}

1745

1663

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1664

/* Raise priviliges */

1665

raise_privileges();

1752

1666

1753

1667

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

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");

1765

1675

}

1766

1676

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1677

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

1678

ret_errno = errno;

1769

1679

#ifdef __linux__

1770

1680

if(restore_loglevel){

1771

1681

ret_linux = klogctl(7, NULL, 0);

1775

1685

}

1776

1686

#endif /* __linux__ */

1777

1687

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1688

/* Lower privileges */

1689

lower_privileges();

1787

1690

1788

1691

/* Close the socket */

1789

1692

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

1792

1695

}

1793

1696

1794

1697

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1698

errno = ret_errno;

1796

1699

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

1700

errno = old_errno;

1798

return ioctl_errno;

1701

return ret_errno;

1799

1702

}

1800

1703

} else if(debug){

1801

1704

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

1819

1722

return 0;

1820

1723

}

1821

1724

1822

__attribute__((nonnull, warn_unused_result))

1823

1725

error_t take_down_interface(const char *const interface){

1726

int sd = -1;

1824

1727

error_t old_errno = errno;

1728

error_t ret_errno = 0;

1729

int ret, ret_setflags;

1825

1730

struct ifreq network;

1826

1731

unsigned int if_index = if_nametoindex(interface);

1827

1732

if(if_index == 0){

1830

1735

return ENXIO;

1831

1736

}

1832

1737

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

1738

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

1835

1739

ret_errno = errno;

1836

1740

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

1837

1741

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

1838

errno = old_errno;

1839

1742

return ret_errno;

1840

1743

}

1841

1744

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

1842

1745

1843

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

1844

if(sd == -1){

1746

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1747

if(sd < 0){

1845

1748

ret_errno = errno;

1846

1749

perror_plus("socket");

1847

1750

errno = old_errno;

1853

1756

interface);

1854

1757

}

1855

1758

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

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();

1875

1767

1876

1768

/* Close the socket */

1877

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

1769

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

1878

1770

if(ret == -1){

1879

1771

perror_plus("close");

1880

1772

}

1881

1773

1882

1774

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1775

errno = ret_errno;

1884

1776

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

1777

errno = old_errno;

1886

return ioctl_errno;

1778

return ret_errno;

1887

1779

}

1888

1780

} else if(debug){

1889

1781

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

1897

1789

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

1898

1790

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

1899

1791

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

1900

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

1792

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

1901

1793

.interfaces = NULL, .interfaces_size = 0 };

1902

1794

AvahiSServiceBrowser *sb = NULL;

1903

1795

error_t ret_errno;

1907

1799

int exitcode = EXIT_SUCCESS;

1908

1800

char *interfaces_to_take_down = NULL;

1909

1801

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1802

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

1803

bool tempdir_created = false;

1913

1804

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

1805

const char *seckey = PATHDIR "/" SECKEY;

1915

1806

const char *pubkey = PATHDIR "/" PUBKEY;

1916

1807

char *interfaces_hooks = NULL;

1808

size_t interfaces_hooks_size = 0;

1917

1809

1918

1810

bool gnutls_initialized = false;

1919

1811

bool gpgme_initialized = false;

2097

1989

/* Work around Debian bug #633582:

2098

1990

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

2099

1991

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

1992

/* Re-raise priviliges */

1993

if(raise_privileges() == 0){

2106

1994

struct stat st;

2107

1995

2108

1996

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

2148

2036

}

2149

2037

2150

2038

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2039

lower_privileges();

2156

2040

}

2157

2041

}

2158

2042

2182

2066

goto end;

2183

2067

}

2184

2068

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

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

}

2189

2077

}

2190

2078

2191

2079

if(not debug){

2269

2157

2270

2158

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

2271

2159

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2160

struct dirent **direntries;

2273

2161

/* Look for any good interfaces */

2274

2162

ret = scandir(sys_class_net, &direntries, good_interface,

2275

2163

alphasort);

2279

2167

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

2280

2168

direntries[i]->d_name);

2281

2169

if(ret_errno != 0){

2282

errno = ret_errno;

2283

2170

perror_plus("argz_add");

2284

free(direntries[i]);

2285

2171

continue;

2286

2172

}

2287

2173

if(debug){

2288

2174

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

2289

2175

direntries[i]->d_name);

2290

2176

}

2291

free(direntries[i]);

2292

2177

}

2293

2178

free(direntries);

2294

2179

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2180

free(direntries);

2298

2181

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

2299

2182

exitcode = EXIT_FAILURE;

2300

2183

goto end;

2323

2206

break;

2324

2207

}

2325

2208

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2209

ret = bring_up_interface(interface, delay);

2327

2210

if(not interface_was_up){

2328

if(errno != 0){

2211

if(ret != 0){

2212

errno = ret;

2329

2213

perror_plus("Failed to bring up interface");

2330

2214

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2215

ret_errno = argz_add(&interfaces_to_take_down,

2216

&interfaces_to_take_down_size,

2217

interface);

2337

2218

}

2338

2219

}

2339

2220

}

2368

2249

goto end;

2369

2250

}

2370

2251

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2252

if(mkdtemp(tempdir) == NULL){

2381

2253

perror_plus("mkdtemp");

2382

2254

goto end;

2383

2255

}

2256

tempdir_created = true;

2384

2257

2385

2258

if(quit_now){

2386

2259

goto end;

2461

2334

sleep((unsigned int)retry_interval);

2462

2335

}

2463

2336

2464

if(not quit_now){

2337

if (not quit_now){

2465

2338

exitcode = EXIT_SUCCESS;

2466

2339

}

2467

2340

2522

2395

if(debug){

2523

2396

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

2524

2397

}

2525

2398

2526

2399

ret = avahi_loop_with_timeout(simple_poll,

2527

2400

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

2528

2401

if(debug){

2564

2437

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

2565

2438

while(mc.current_server != NULL){

2566

2439

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2575

2440

free(mc.current_server);

2576

2441

mc.current_server = next;

2577

2442

}

2578

2443

}

2579

2444

2580

/* Re-raise privileges */

2445

/* Re-raise priviliges */

2581

2446

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

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();

2616

2472

}

2617

2473

2618

2474

free(interfaces_to_take_down);

2619

2475

free(interfaces_hooks);

2620

2476

2621

2477

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

2622

if(tempdir != NULL){

2478

if(tempdir_created){

2623

2479

struct dirent **direntries = NULL;

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

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);

2661

2499

}

2662

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");

2663

2510

}

2664

2511

}

2665

2512