/mandos/release : revision 237.23.4

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif

35

#endif /* not _LARGEFILE_SOURCE */

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif

38

#endif /* not _FILE_OFFSET_BITS */

39

40

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

41

42

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

43

stdout, ferror(), remove() */

43

stdout, ferror() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect() */

59

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

60

61

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

61

62

*/

62

63

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

72

73

*/

73

74

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

74

75

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

75

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

76

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

76

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

77

unlinkat() */

78

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

77

79

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

78

80

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

79

81

argp_state, struct argp,

91

93

argz_delete(), argz_append(),

92

94

argz_stringify(), argz_add(),

93

95

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

94

98

95

99

#ifdef __linux__

96

100

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

138

142

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

139

143

char *connect_to = NULL;

140

144

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

141

146

uid_t uid = 65534;

142

147

gid_t gid = 65534;

143

148

180

185

perror(print_text);

181

186

}

182

187

183

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

188

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

184

189

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

185

190

va_list ap;

186

191

va_start (ap, format);

187

192

188

193

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

189

194

program_invocation_short_name));

190

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

195

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

191

196

}

192

197

193

198

/*

195

200

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

196

201

* "buffer_length" is how much is already used.

197

202

*/

203

__attribute__((nonnull, warn_unused_result))

198

204

size_t incbuffer(char **buffer, size_t buffer_length,

199

205

size_t buffer_capacity){

200

206

if(buffer_length + BUFFER_SIZE > buffer_capacity){

201

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

202

if(buffer == NULL){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

203

213

return 0;

204

214

}

215

*buffer = new_buf;

205

216

buffer_capacity += BUFFER_SIZE;

206

217

}

207

218

return buffer_capacity;

208

219

}

209

220

210

221

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

222

__attribute__((nonnull, warn_unused_result))

211

223

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

212

224

int af, server **current_server){

213

225

int ret;

222

234

.af = af };

223

235

if(new_server->ip == NULL){

224

236

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

225

252

return false;

226

253

}

227

254

/* Special case of first server */

229

256

new_server->next = new_server;

230

257

new_server->prev = new_server;

231

258

*current_server = new_server;

232

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

233

259

} else {

260

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

234

261

new_server->next = *current_server;

235

262

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

236

263

new_server->prev->next = new_server;

237

264

(*current_server)->prev = new_server;

238

265

}

239

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

240

if(ret == -1){

241

perror_plus("clock_gettime");

242

return false;

243

}

244

266

return true;

245

267

}

246

268

247

269

/*

248

270

* Initialize GPGME.

249

271

*/

250

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

251

const char *tempdir, mandos_context *mc){

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

252

277

gpgme_error_t rc;

253

278

gpgme_engine_info_t engine_info;

254

279

255

280

/*

256

281

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

257

282

*/

258

bool import_key(const char *filename){

283

bool import_key(const char * const filename){

259

284

int ret;

260

285

int fd;

261

286

gpgme_data_t pgp_data;

342

367

* Decrypt OpenPGP data.

343

368

* Returns -1 on error

344

369

*/

370

__attribute__((nonnull, warn_unused_result))

345

371

static ssize_t pgp_packet_decrypt(const char *cryptotext,

346

372

size_t crypto_size,

347

373

char **plaintext,

467

493

return plaintext_length;

468

494

}

469

495

470

static const char * safer_gnutls_strerror(int value){

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

471

498

const char *ret = gnutls_strerror(value);

472

499

if(ret == NULL)

473

500

ret = "(unknown)";

475

502

}

476

503

477

504

/* GnuTLS log function callback */

505

__attribute__((nonnull))

478

506

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

479

507

const char* string){

480

508

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

481

509

}

482

510

511

__attribute__((nonnull, warn_unused_result))

483

512

static int init_gnutls_global(const char *pubkeyfilename,

484

513

const char *seckeyfilename,

485

514

mandos_context *mc){

559

588

return -1;

560

589

}

561

590

591

__attribute__((nonnull, warn_unused_result))

562

592

static int init_gnutls_session(gnutls_session_t *session,

563

593

mandos_context *mc){

564

594

int ret;

621

651

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

622

652

623

653

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

624

655

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

625

656

AvahiIfIndex if_index,

626

657

int af, mandos_context *mc){

627

658

int ret, tcp_sd = -1;

628

659

ssize_t sret;

629

union {

630

struct sockaddr_in in;

631

struct sockaddr_in6 in6;

632

} to;

660

struct sockaddr_storage to;

633

661

char *buffer = NULL;

634

662

char *decrypted_buffer = NULL;

635

663

size_t buffer_length = 0;

659

687

return -1;

660

688

}

661

689

690

/* If the interface is specified and we have a list of interfaces */

662

691

if(if_index != AVAHI_IF_UNSPEC and mc->interfaces != NULL){

663

692

/* Check if the interface is one of the interfaces we are using */

664

693

bool match = false;

673

702

}

674

703

}

675

704

if(not match){

705

/* This interface does not match any in the list, so we don't

706

connect to the server */

676

707

if(debug){

677

708

char interface[IF_NAMESIZE];

678

709

if(if_indextoname((unsigned int)if_index, interface) == NULL){

713

744

714

745

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

715

746

if(af == AF_INET6){

716

to.in6.sin6_family = (sa_family_t)af;

717

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);

718

749

} else { /* IPv4 */

719

to.in.sin_family = (sa_family_t)af;

720

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);

721

752

}

722

753

if(ret < 0 ){

723

754

int e = errno;

732

763

goto mandos_end;

733

764

}

734

765

if(af == AF_INET6){

735

to.in6.sin6_port = htons(port);

736

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

737

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

738

-Wunreachable-code*/

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

739

769

if(if_index == AVAHI_IF_UNSPEC){

740

770

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

741

771

" incomplete without a network interface\n");

743

773

goto mandos_end;

744

774

}

745

775

/* Set the network interface number as scope */

746

to.in6.sin6_scope_id = (uint32_t)if_index;

776

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

747

777

}

748

778

} else {

749

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

750

-Wconversion and

751

-Wunreachable-code */

779

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

752

780

}

753

781

754

782

if(quit_now){

771

799

}

772

800

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

773

801

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

774

const char *pcret;

775

802

if(af == AF_INET6){

776

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

777

sizeof(addrstr));

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

778

807

} else {

779

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

780

sizeof(addrstr));

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

781

812

}

782

if(pcret == NULL){

783

perror_plus("inet_ntop");

784

} else {

785

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

786

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

787

}

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);

788

819

}

789

820

}

790

821

794

825

}

795

826

796

827

if(af == AF_INET6){

797

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

828

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

829

sizeof(struct sockaddr_in6));

798

830

} else {

799

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

831

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

832

sizeof(struct sockaddr_in));

800

833

}

801

834

if(ret < 0){

802

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

835

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

803

836

int e = errno;

804

837

perror_plus("connect");

805

838

errno = e;

1020

1053

return retval;

1021

1054

}

1022

1055

1056

__attribute__((nonnull))

1023

1057

static void resolve_callback(AvahiSServiceResolver *r,

1024

1058

AvahiIfIndex interface,

1025

1059

AvahiProtocol proto,

1033

1067

AVAHI_GCC_UNUSED AvahiStringList *txt,

1034

1068

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1035

1069

flags,

1036

void* mc){

1070

void *mc){

1037

1071

if(r == NULL){

1038

1072

return;

1039

1073

}

1042

1076

timed out */

1043

1077

1044

1078

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1045

1080

return;

1046

1081

}

1047

1082

1092

1127

const char *domain,

1093

1128

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1094

1129

flags,

1095

void* mc){

1130

void *mc){

1096

1131

if(b == NULL){

1097

1132

return;

1098

1133

}

1158

1193

errno = old_errno;

1159

1194

}

1160

1195

1196

__attribute__((nonnull, warn_unused_result))

1161

1197

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

1162

1198

int ret;

1163

1199

error_t ret_errno;

1182

1218

return true;

1183

1219

}

1184

1220

1221

__attribute__((nonnull, warn_unused_result))

1185

1222

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

1186

1223

1187

1224

/* Reject the loopback device */

1229

1266

* corresponds to an acceptable network device.

1230

1267

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

1231

1268

*/

1269

__attribute__((nonnull, warn_unused_result))

1232

1270

int good_interface(const struct dirent *if_entry){

1233

1271

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

1234

1272

return 0;

1252

1290

/*

1253

1291

* This function determines if a network interface is up.

1254

1292

*/

1293

__attribute__((nonnull, warn_unused_result))

1255

1294

bool interface_is_up(const char *interface){

1256

1295

struct ifreq ifr;

1257

1296

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

1268

1307

/*

1269

1308

* This function determines if a network interface is running

1270

1309

*/

1310

__attribute__((nonnull, warn_unused_result))

1271

1311

bool interface_is_running(const char *interface){

1272

1312

struct ifreq ifr;

1273

1313

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

1281

1321

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

1282

1322

}

1283

1323

1324

__attribute__((nonnull, pure, warn_unused_result))

1284

1325

int notdotentries(const struct dirent *direntry){

1285

1326

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

1286

1327

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

1293

1334

}

1294

1335

1295

1336

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

1337

__attribute__((nonnull, warn_unused_result))

1296

1338

int runnable_hook(const struct dirent *direntry){

1297

1339

int ret;

1298

1340

size_t sret;

1306

1348

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

1307

1349

"abcdefghijklmnopqrstuvwxyz"

1308

1350

"0123456789"

1309

"_-");

1351

"_.-");

1310

1352

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

1311

1353

/* Contains non-allowed characters */

1312

1354

if(debug){

1316

1358

return 0;

1317

1359

}

1318

1360

1319

char *fullname = NULL;

1320

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

1321

if(ret < 0){

1322

perror_plus("asprintf");

1323

return 0;

1324

}

1325

1326

ret = stat(fullname, &st);

1361

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

1327

1362

if(ret == -1){

1328

1363

if(debug){

1329

1364

perror_plus("Could not stat hook");

1353

1388

return 1;

1354

1389

}

1355

1390

1391

__attribute__((nonnull, warn_unused_result))

1356

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1357

1393

mandos_context *mc){

1358

1394

int ret;

1362

1398

1363

1399

while(true){

1364

1400

if(mc->current_server == NULL){

1365

if (debug){

1401

if(debug){

1366

1402

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

1367

1403

" No timeout!\n");

1368

1404

}

1369

1405

ret = avahi_simple_poll_iterate(s, -1);

1370

1406

} else {

1371

if (debug){

1407

if(debug){

1372

1408

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

1373

1409

" it, or wait\n");

1374

1410

}

1391

1427

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

1392

1428

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

1393

1429

1394

if (debug){

1430

if(debug){

1395

1431

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

1396

1432

block_time);

1397

1433

}

1419

1455

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

1420

1456

}

1421

1457

if(ret != 0){

1422

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

1458

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

1423

1459

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

1424

1460

}

1425

1461

}

1427

1463

}

1428

1464

1429

1465

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

1466

__attribute__((warn_unused_result))

1430

1467

error_t raise_privileges(void){

1431

1468

error_t old_errno = errno;

1432

1469

error_t ret_errno = 0;

1433

1470

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

1434

1471

ret_errno = errno;

1435

perror_plus("seteuid");

1436

1472

}

1437

1473

errno = old_errno;

1438

1474

return ret_errno;

1439

1475

}

1440

1476

1441

1477

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

1478

__attribute__((warn_unused_result))

1442

1479

error_t raise_privileges_permanently(void){

1443

1480

error_t old_errno = errno;

1444

1481

error_t ret_errno = raise_privileges();

1448

1485

}

1449

1486

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

1450

1487

ret_errno = errno;

1451

perror_plus("seteuid");

1452

1488

}

1453

1489

errno = old_errno;

1454

1490

return ret_errno;

1455

1491

}

1456

1492

1457

1493

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

1494

__attribute__((warn_unused_result))

1458

1495

error_t lower_privileges(void){

1459

1496

error_t old_errno = errno;

1460

1497

error_t ret_errno = 0;

1461

1498

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

1462

1499

ret_errno = errno;

1463

perror_plus("seteuid");

1464

1500

}

1465

1501

errno = old_errno;

1466

1502

return ret_errno;

1467

1503

}

1468

1504

1469

1505

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1470

1507

error_t lower_privileges_permanently(void){

1471

1508

error_t old_errno = errno;

1472

1509

error_t ret_errno = 0;

1473

1510

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

1474

1511

ret_errno = errno;

1475

perror_plus("setuid");

1476

1512

}

1477

1513

errno = old_errno;

1478

1514

return ret_errno;

1479

1515

}

1480

1516

1481

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

1517

__attribute__((nonnull))

1518

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

1482

1519

const float delay){

1483

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

}

1484

1551

struct dirent *direntry;

1485

1552

int ret;

1486

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

1487

alphasort);

1488

if(numhooks == -1){

1489

if(errno == ENOENT){

1490

if(debug){

1491

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

1492

" found\n", hookdir);

1493

}

1494

} else {

1495

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);

1496

1559

}

1497

} else {

1498

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

1499

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

1500

direntry = direntries[i];

1501

char *fullname = NULL;

1502

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

1503

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){

1504

1621

perror_plus("asprintf");

1505

continue;

1506

}

1507

if(debug){

1508

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

1509

direntry->d_name);

1510

}

1511

pid_t hook_pid = fork();

1512

if(hook_pid == 0){

1513

/* Child */

1514

/* Raise privileges */

1515

raise_privileges_permanently();

1516

/* Set group */

1517

errno = 0;

1518

ret = setgid(0);

1519

if(ret == -1){

1520

perror_plus("setgid");

1521

}

1522

/* Reset supplementary groups */

1523

errno = 0;

1524

ret = setgroups(0, NULL);

1525

if(ret == -1){

1526

perror_plus("setgroups");

1527

}

1528

dup2(devnull, STDIN_FILENO);

1529

close(devnull);

1530

dup2(STDERR_FILENO, STDOUT_FILENO);

1531

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

1532

if(ret == -1){

1533

perror_plus("setenv");

1534

_exit(EX_OSERR);

1535

}

1536

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

1537

if(ret == -1){

1538

perror_plus("setenv");

1539

_exit(EX_OSERR);

1540

}

1541

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

1542

if(ret == -1){

1543

perror_plus("setenv");

1544

_exit(EX_OSERR);

1545

}

1546

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

1547

if(ret == -1){

1548

perror_plus("setenv");

1549

_exit(EX_OSERR);

1550

}

1551

char *delaystring;

1552

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

1553

if(ret == -1){

1554

perror_plus("asprintf");

1555

_exit(EX_OSERR);

1556

}

1557

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

1558

if(ret == -1){

1559

free(delaystring);

1560

perror_plus("setenv");

1561

_exit(EX_OSERR);

1562

}

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1563

1626

free(delaystring);

1564

if(connect_to != NULL){

1565

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

1566

if(ret == -1){

1567

perror_plus("setenv");

1568

_exit(EX_OSERR);

1569

}

1570

}

1571

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

1572

perror_plus("execl");

1573

_exit(EXIT_FAILURE);

1574

}

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;

1575

1673

} else {

1576

int status;

1577

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

1578

perror_plus("waitpid");

1579

free(fullname);

1580

continue;

1581

}

1582

if(WIFEXITED(status)){

1583

if(WEXITSTATUS(status) != 0){

1584

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

1585

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

1586

WEXITSTATUS(status));

1587

free(fullname);

1588

continue;

1589

}

1590

} else if(WIFSIGNALED(status)){

1591

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

1592

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

1593

WTERMSIG(status));

1594

free(fullname);

1595

continue;

1596

} else {

1597

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

1598

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

1599

free(fullname);

1600

continue;

1601

}

1602

}

1603

free(fullname);

1604

if(debug){

1605

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

1606

direntry->d_name);

1607

}

1608

}

1609

close(devnull);

1610

}

1611

return true;

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);

1612

1693

}

1613

1694

1695

__attribute__((nonnull, warn_unused_result))

1614

1696

error_t bring_up_interface(const char *const interface,

1615

1697

const float delay){

1616

int sd = -1;

1617

1698

error_t old_errno = errno;

1618

error_t ret_errno = 0;

1619

int ret, ret_setflags;

1699

int ret;

1620

1700

struct ifreq network;

1621

1701

unsigned int if_index = if_nametoindex(interface);

1622

1702

if(if_index == 0){

1631

1711

}

1632

1712

1633

1713

if(not interface_is_up(interface)){

1634

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

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1635

1716

ret_errno = errno;

1636

1717

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

1637

1718

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

1719

errno = old_errno;

1638

1720

return ret_errno;

1639

1721

}

1640

network.ifr_flags |= IFF_UP;

1722

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

1641

1723

1642

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1643

if(sd < 0){

1724

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

1725

if(sd == -1){

1644

1726

ret_errno = errno;

1645

1727

perror_plus("socket");

1646

1728

errno = old_errno;

1647

1729

return ret_errno;

1648

1730

}

1649

1731

1650

1732

if(quit_now){

1651

close(sd);

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1652

1737

errno = old_errno;

1653

1738

return EINTR;

1654

1739

}

1658

1743

interface);

1659

1744

}

1660

1745

1661

/* Raise priviliges */

1662

raise_privileges();

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

}

1663

1752

1664

1753

#ifdef __linux__

1665

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1666

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

1667

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

1668

bool restore_loglevel = true;

1669

if(ret_linux == -1){

1670

restore_loglevel = false;

1671

perror_plus("klogctl");

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

}

1672

1765

}

1673

1766

#endif /* __linux__ */

1674

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

1675

ret_errno = errno;

1767

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

1768

ioctl_errno = errno;

1676

1769

#ifdef __linux__

1677

1770

if(restore_loglevel){

1678

1771

ret_linux = klogctl(7, NULL, 0);

1682

1775

}

1683

1776

#endif /* __linux__ */

1684

1777

1685

/* Lower privileges */

1686

lower_privileges();

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

}

1687

1787

1688

1788

/* Close the socket */

1689

1789

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

1692

1792

}

1693

1793

1694

1794

if(ret_setflags == -1){

1695

errno = ret_errno;

1795

errno = ioctl_errno;

1696

1796

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1697

1797

errno = old_errno;

1698

return ret_errno;

1798

return ioctl_errno;

1699

1799

}

1700

1800

} else if(debug){

1701

1801

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

1719

1819

return 0;

1720

1820

}

1721

1821

1822

__attribute__((nonnull, warn_unused_result))

1722

1823

error_t take_down_interface(const char *const interface){

1723

int sd = -1;

1724

1824

error_t old_errno = errno;

1725

error_t ret_errno = 0;

1726

int ret, ret_setflags;

1727

1825

struct ifreq network;

1728

1826

unsigned int if_index = if_nametoindex(interface);

1729

1827

if(if_index == 0){

1732

1830

return ENXIO;

1733

1831

}

1734

1832

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1735

1834

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

1736

1835

ret_errno = errno;

1737

1836

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

1738

1837

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

1838

errno = old_errno;

1739

1839

return ret_errno;

1740

1840

}

1741

1841

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

1742

1842

1743

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1744

if(sd < 0){

1843

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

1844

if(sd == -1){

1745

1845

ret_errno = errno;

1746

1846

perror_plus("socket");

1747

1847

errno = old_errno;

1753

1853

interface);

1754

1854

}

1755

1855

1756

/* Raise priviliges */

1757

raise_privileges();

1758

1759

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

1760

ret_errno = errno;

1761

1762

/* Lower privileges */

1763

lower_privileges();

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

}

1764

1875

1765

1876

/* Close the socket */

1766

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

1877

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

1767

1878

if(ret == -1){

1768

1879

perror_plus("close");

1769

1880

}

1770

1881

1771

1882

if(ret_setflags == -1){

1772

errno = ret_errno;

1883

errno = ioctl_errno;

1773

1884

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1774

1885

errno = old_errno;

1775

return ret_errno;

1886

return ioctl_errno;

1776

1887

}

1777

1888

} else if(debug){

1778

1889

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

1786

1897

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

1787

1898

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

1788

1899

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

1789

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

1900

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

1790

1901

.interfaces = NULL, .interfaces_size = 0 };

1791

1902

AvahiSServiceBrowser *sb = NULL;

1792

1903

error_t ret_errno;

1796

1907

int exitcode = EXIT_SUCCESS;

1797

1908

char *interfaces_to_take_down = NULL;

1798

1909

size_t interfaces_to_take_down_size = 0;

1799

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

1800

bool tempdir_created = false;

1910

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

1911

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

1912

char *tempdir = NULL;

1801

1913

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1802

1914

const char *seckey = PATHDIR "/" SECKEY;

1803

1915

const char *pubkey = PATHDIR "/" PUBKEY;

1804

1916

char *interfaces_hooks = NULL;

1805

size_t interfaces_hooks_size = 0;

1806

1917

1807

1918

bool gnutls_initialized = false;

1808

1919

bool gpgme_initialized = false;

1986

2097

/* Work around Debian bug #633582:

1987

2098

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

1988

2099

1989

/* Re-raise priviliges */

1990

if(raise_privileges() == 0){

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 {

1991

2106

struct stat st;

1992

2107

1993

2108

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

2033

2148

}

2034

2149

2035

2150

/* Lower privileges */

2036

lower_privileges();

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

2155

}

2037

2156

}

2038

2157

}

2039

2158

2063

2182

goto end;

2064

2183

}

2065

2184

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

2066

interfaces_hooks_size = mc.interfaces_size;

2067

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2068

(int)',');

2069

}

2070

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

2071

interfaces_hooks : "", delay)){

2072

goto end;

2073

}

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2074

2189

}

2075

2190

2076

2191

if(not debug){

2154

2269

2155

2270

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

2156

2271

if(mc.interfaces == NULL){

2157

struct dirent **direntries;

2272

struct dirent **direntries = NULL;

2158

2273

/* Look for any good interfaces */

2159

2274

ret = scandir(sys_class_net, &direntries, good_interface,

2160

2275

alphasort);

2164

2279

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

2165

2280

direntries[i]->d_name);

2166

2281

if(ret_errno != 0){

2282

errno = ret_errno;

2167

2283

perror_plus("argz_add");

2284

free(direntries[i]);

2168

2285

continue;

2169

2286

}

2170

2287

if(debug){

2171

2288

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

2172

2289

direntries[i]->d_name);

2173

2290

}

2291

free(direntries[i]);

2174

2292

}

2175

2293

free(direntries);

2176

2294

} else {

2177

free(direntries);

2295

if(ret == 0){

2296

free(direntries);

2297

}

2178

2298

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

2179

2299

exitcode = EXIT_FAILURE;

2180

2300

goto end;

2181

2301

}

2182

2302

}

2183

2303

2184

/* Bring up interfaces which are down */

2304

/* Bring up interfaces which are down, and remove any "none"s */

2185

2305

{

2186

2306

char *interface = NULL;

2187

2307

while((interface = argz_next(mc.interfaces, mc.interfaces_size,

2203

2323

break;

2204

2324

}

2205

2325

bool interface_was_up = interface_is_up(interface);

2206

ret = bring_up_interface(interface, delay);

2326

errno = bring_up_interface(interface, delay);

2207

2327

if(not interface_was_up){

2208

if(ret != 0){

2209

errno = ret;

2328

if(errno != 0){

2210

2329

perror_plus("Failed to bring up interface");

2211

2330

} else {

2212

ret_errno = argz_add(&interfaces_to_take_down,

2213

&interfaces_to_take_down_size,

2214

interface);

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

2337

}

2216

2338

}

2217

2339

}

2246

2368

goto end;

2247

2369

}

2248

2370

2249

if(mkdtemp(tempdir) == NULL){

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){

2250

2381

perror_plus("mkdtemp");

2251

2382

goto end;

2252

2383

}

2253

tempdir_created = true;

2254

2384

2255

2385

if(quit_now){

2256

2386

goto end;

2328

2458

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

2329

2459

(int)retry_interval);

2330

2460

}

2331

sleep((int)retry_interval);

2461

sleep((unsigned int)retry_interval);

2332

2462

}

2333

2463

2334

if (not quit_now){

2464

if(not quit_now){

2335

2465

exitcode = EXIT_SUCCESS;

2336

2466

}

2337

2467

2392

2522

if(debug){

2393

2523

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

2394

2524

}

2395

2525

2396

2526

ret = avahi_loop_with_timeout(simple_poll,

2397

2527

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

2398

2528

if(debug){

2434

2564

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

2435

2565

while(mc.current_server != NULL){

2436

2566

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

2437

2575

free(mc.current_server);

2438

2576

mc.current_server = next;

2439

2577

}

2440

2578

}

2441

2579

2442

/* Re-raise priviliges */

2580

/* Re-raise privileges */

2443

2581

{

2444

raise_privileges();

2445

2446

/* Run network hooks */

2447

run_network_hooks("stop", interfaces_hooks != NULL ?

2448

interfaces_hooks : "", delay);

2449

2450

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

2451

{

2452

char *interface = NULL;

2453

while((interface=argz_next(interfaces_to_take_down,

2454

interfaces_to_take_down_size,

2455

interface))){

2456

ret_errno = take_down_interface(interface);

2457

if(ret_errno != 0){

2458

errno = ret_errno;

2459

perror_plus("Failed to take down interface");

2460

}

2461

}

2462

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

2463

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

2464

" down\n");

2465

}

2466

}

2467

2468

lower_privileges_permanently();

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

}

2469

2616

}

2470

2617

2471

2618

free(interfaces_to_take_down);

2472

2619

free(interfaces_hooks);

2473

2620

2474

2621

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

2475

if(tempdir_created){

2622

if(tempdir != NULL){

2476

2623

struct dirent **direntries = NULL;

2477

struct dirent *direntry = NULL;

2478

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

2479

alphasort);

2480

if (numentries > 0){

2481

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

2482

direntry = direntries[i];

2483

char *fullname = NULL;

2484

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

2485

direntry->d_name);

2486

if(ret < 0){

2487

perror_plus("asprintf");

2488

continue;

2489

}

2490

ret = remove(fullname);

2491

if(ret == -1){

2492

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

2493

strerror(errno));

2494

}

2495

free(fullname);

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

}

2496

2661

}

2497

}

2498

2499

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

2500

free(direntries);

2501

if (numentries == -1){

2502

perror_plus("scandir");

2503

}

2504

ret = rmdir(tempdir);

2505

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

2506

perror_plus("rmdir");

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2507

2663

}

2508

2664

}

2509

2665