/mandos/trunk : revision 670

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

183

perror(print_text);

184

}

185

186

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

186

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

187

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

188

va_list ap;

189

va_start (ap, format);

198

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

199

* "buffer_length" is how much is already used.

200

*/

201

__attribute__((nonnull, warn_unused_result))

202

201

size_t incbuffer(char **buffer, size_t buffer_length,

203

202

size_t buffer_capacity){

204

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

217

216

}

218

217

219

218

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

220

__attribute__((nonnull, warn_unused_result))

221

219

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

222

220

int af, server **current_server){

223

221

int ret;

244

242

new_server->next = new_server;

245

243

new_server->prev = new_server;

246

244

*current_server = new_server;

245

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

247

246

} else {

248

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

249

247

new_server->next = *current_server;

250

248

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

251

249

new_server->prev->next = new_server;

257

255

/*

258

256

* Initialize GPGME.

259

257

*/

260

__attribute__((nonnull, warn_unused_result))

261

static bool init_gpgme(const char * const seckey,

262

const char * const pubkey,

263

const char * const tempdir,

264

mandos_context *mc){

258

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

259

const char *tempdir, mandos_context *mc){

265

260

gpgme_error_t rc;

266

261

gpgme_engine_info_t engine_info;

267

262

268

263

/*

269

264

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

270

265

*/

271

bool import_key(const char * const filename){

266

bool import_key(const char *filename){

272

267

int ret;

273

268

int fd;

274

269

gpgme_data_t pgp_data;

355

350

* Decrypt OpenPGP data.

356

351

* Returns -1 on error

357

352

*/

358

__attribute__((nonnull, warn_unused_result))

359

353

static ssize_t pgp_packet_decrypt(const char *cryptotext,

360

354

size_t crypto_size,

361

355

char **plaintext,

481

475

return plaintext_length;

482

476

}

483

477

484

__attribute__((warn_unused_result))

485

static const char *safer_gnutls_strerror(int value){

478

static const char * safer_gnutls_strerror(int value){

486

479

const char *ret = gnutls_strerror(value);

487

480

if(ret == NULL)

488

481

ret = "(unknown)";

490

483

}

491

484

492

485

/* GnuTLS log function callback */

493

__attribute__((nonnull))

494

486

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

495

487

const char* string){

496

488

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

497

489

}

498

490

499

__attribute__((nonnull, warn_unused_result))

500

491

static int init_gnutls_global(const char *pubkeyfilename,

501

492

const char *seckeyfilename,

502

493

mandos_context *mc){

576

567

return -1;

577

568

}

578

569

579

__attribute__((nonnull, warn_unused_result))

580

570

static int init_gnutls_session(gnutls_session_t *session,

581

571

mandos_context *mc){

582

572

int ret;

639

629

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

640

630

641

631

/* Called when a Mandos server is found */

642

__attribute__((nonnull, warn_unused_result))

643

632

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

644

633

AvahiIfIndex if_index,

645

634

int af, mandos_context *mc){

751

740

goto mandos_end;

752

741

}

753

742

if(af == AF_INET6){

754

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

743

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

755

744

if(IN6_IS_ADDR_LINKLOCAL

756

745

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

757

746

if(if_index == AVAHI_IF_UNSPEC){

820

809

sizeof(struct sockaddr_in));

821

810

}

822

811

if(ret < 0){

823

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

812

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

824

813

int e = errno;

825

814

perror_plus("connect");

826

815

errno = e;

1041

1030

return retval;

1042

1031

}

1043

1032

1044

__attribute__((nonnull))

1045

1033

static void resolve_callback(AvahiSServiceResolver *r,

1046

1034

AvahiIfIndex interface,

1047

1035

AvahiProtocol proto,

1055

1043

AVAHI_GCC_UNUSED AvahiStringList *txt,

1056

1044

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1057

1045

flags,

1058

void *mc){

1046

void* mc){

1059

1047

if(r == NULL){

1060

1048

return;

1061

1049

}

1114

1102

const char *domain,

1115

1103

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1116

1104

flags,

1117

void *mc){

1105

void* mc){

1118

1106

if(b == NULL){

1119

1107

return;

1120

1108

}

1180

1168

errno = old_errno;

1181

1169

}

1182

1170

1183

__attribute__((nonnull, warn_unused_result))

1184

1171

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

1185

1172

int ret;

1186

1173

error_t ret_errno;

1205

1192

return true;

1206

1193

}

1207

1194

1208

__attribute__((nonnull, warn_unused_result))

1209

1195

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

1210

1196

1211

1197

/* Reject the loopback device */

1253

1239

* corresponds to an acceptable network device.

1254

1240

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

1255

1241

*/

1256

__attribute__((nonnull, warn_unused_result))

1257

1242

int good_interface(const struct dirent *if_entry){

1258

1243

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

1259

1244

return 0;

1277

1262

/*

1278

1263

* This function determines if a network interface is up.

1279

1264

*/

1280

__attribute__((nonnull, warn_unused_result))

1281

1265

bool interface_is_up(const char *interface){

1282

1266

struct ifreq ifr;

1283

1267

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

1294

1278

/*

1295

1279

* This function determines if a network interface is running

1296

1280

*/

1297

__attribute__((nonnull, warn_unused_result))

1298

1281

bool interface_is_running(const char *interface){

1299

1282

struct ifreq ifr;

1300

1283

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

1308

1291

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

1309

1292

}

1310

1293

1311

__attribute__((nonnull, pure, warn_unused_result))

1312

1294

int notdotentries(const struct dirent *direntry){

1313

1295

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

1314

1296

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

1321

1303

}

1322

1304

1323

1305

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

1324

__attribute__((nonnull, warn_unused_result))

1325

1306

int runnable_hook(const struct dirent *direntry){

1326

1307

int ret;

1327

1308

size_t sret;

1335

1316

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

1336

1317

"abcdefghijklmnopqrstuvwxyz"

1337

1318

"0123456789"

1338

"_.-");

1319

"_-");

1339

1320

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

1340

1321

/* Contains non-allowed characters */

1341

1322

if(debug){

1359

1340

}

1360

1341

return 0;

1361

1342

}

1362

free(fullname);

1363

1343

if(not (S_ISREG(st.st_mode))){

1364

1344

/* Not a regular file */

1365

1345

if(debug){

1383

1363

return 1;

1384

1364

}

1385

1365

1386

__attribute__((nonnull, warn_unused_result))

1387

1366

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1388

1367

mandos_context *mc){

1389

1368

int ret;

1393

1372

1394

1373

while(true){

1395

1374

if(mc->current_server == NULL){

1396

if(debug){

1375

if (debug){

1397

1376

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

1398

1377

" No timeout!\n");

1399

1378

}

1400

1379

ret = avahi_simple_poll_iterate(s, -1);

1401

1380

} else {

1402

if(debug){

1381

if (debug){

1403

1382

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

1404

1383

" it, or wait\n");

1405

1384

}

1422

1401

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

1423

1402

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

1424

1403

1425

if(debug){

1404

if (debug){

1426

1405

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

1427

1406

block_time);

1428

1407

}

1450

1429

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

1451

1430

}

1452

1431

if(ret != 0){

1453

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

1432

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

1454

1433

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

1455

1434

}

1456

1435

}

1458

1437

}

1459

1438

1460

1439

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

1461

__attribute__((warn_unused_result))

1462

1440

error_t raise_privileges(void){

1463

1441

error_t old_errno = errno;

1464

1442

error_t ret_errno = 0;

1471

1449

}

1472

1450

1473

1451

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

1474

__attribute__((warn_unused_result))

1475

1452

error_t raise_privileges_permanently(void){

1476

1453

error_t old_errno = errno;

1477

1454

error_t ret_errno = raise_privileges();

1488

1465

}

1489

1466

1490

1467

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

1491

__attribute__((warn_unused_result))

1492

1468

error_t lower_privileges(void){

1493

1469

error_t old_errno = errno;

1494

1470

error_t ret_errno = 0;

1501

1477

}

1502

1478

1503

1479

/* Lower privileges permanently */

1504

__attribute__((warn_unused_result))

1505

1480

error_t lower_privileges_permanently(void){

1506

1481

error_t old_errno = errno;

1507

1482

error_t ret_errno = 0;

1513

1488

return ret_errno;

1514

1489

}

1515

1490

1516

__attribute__((nonnull))

1517

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

1491

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

1518

1492

const float delay){

1519

1493

struct dirent **direntries;

1520

1494

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

1548

1522

if(hook_pid == 0){

1549

1523

/* Child */

1550

1524

/* Raise privileges */

1551

if(raise_privileges_permanently() != 0){

1552

perror_plus("Failed to raise privileges");

1553

_exit(EX_NOPERM);

1554

}

1525

raise_privileges_permanently();

1555

1526

/* Set group */

1556

1527

errno = 0;

1557

1528

ret = setgid(0);

1558

1529

if(ret == -1){

1559

1530

perror_plus("setgid");

1560

_exit(EX_NOPERM);

1561

1531

}

1562

1532

/* Reset supplementary groups */

1563

1533

errno = 0;

1564

1534

ret = setgroups(0, NULL);

1565

1535

if(ret == -1){

1566

1536

perror_plus("setgroups");

1567

_exit(EX_NOPERM);

1568

}

1569

ret = dup2(devnull, STDIN_FILENO);

1570

if(ret == -1){

1571

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

1572

_exit(EX_OSERR);

1573

}

1574

ret = close(devnull);

1575

if(ret == -1){

1576

perror_plus("close");

1577

_exit(EX_OSERR);

1578

}

1579

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1580

if(ret == -1){

1581

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

1582

_exit(EX_OSERR);

1583

}

1537

}

1538

dup2(devnull, STDIN_FILENO);

1539

close(devnull);

1540

dup2(STDERR_FILENO, STDOUT_FILENO);

1584

1541

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

1585

1542

if(ret == -1){

1586

1543

perror_plus("setenv");

1602

1559

_exit(EX_OSERR);

1603

1560

}

1604

1561

char *delaystring;

1605

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

1562

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

1606

1563

if(ret == -1){

1607

1564

perror_plus("asprintf");

1608

1565

_exit(EX_OSERR);

1661

1618

}

1662

1619

close(devnull);

1663

1620

}

1621

return true;

1664

1622

}

1665

1623

1666

__attribute__((nonnull, warn_unused_result))

1667

1624

error_t bring_up_interface(const char *const interface,

1668

1625

const float delay){

1626

int sd = -1;

1669

1627

error_t old_errno = errno;

1670

int ret;

1628

error_t ret_errno = 0;

1629

int ret, ret_setflags;

1671

1630

struct ifreq network;

1672

1631

unsigned int if_index = if_nametoindex(interface);

1673

1632

if(if_index == 0){

1682

1641

}

1683

1642

1684

1643

if(not interface_is_up(interface)){

1685

error_t ret_errno = 0, ioctl_errno = 0;

1686

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

1644

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

1687

1645

ret_errno = errno;

1688

1646

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

1689

1647

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

1690

errno = old_errno;

1691

1648

return ret_errno;

1692

1649

}

1693

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

1650

network.ifr_flags |= IFF_UP;

1694

1651

1695

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

1696

if(sd == -1){

1652

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1653

if(sd < 0){

1697

1654

ret_errno = errno;

1698

1655

perror_plus("socket");

1699

1656

errno = old_errno;

1700

1657

return ret_errno;

1701

1658

}

1702

1659

1703

1660

if(quit_now){

1704

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

1705

if(ret == -1){

1706

perror_plus("close");

1707

}

1661

close(sd);

1708

1662

errno = old_errno;

1709

1663

return EINTR;

1710

1664

}

1714

1668

interface);

1715

1669

}

1716

1670

1717

/* Raise privileges */

1718

ret_errno = raise_privileges();

1719

if(ret_errno != 0){

1720

perror_plus("Failed to raise privileges");

1721

}

1671

/* Raise priviliges */

1672

raise_privileges();

1722

1673

1723

1674

#ifdef __linux__

1724

int ret_linux;

1725

bool restore_loglevel = false;

1726

if(ret_errno == 0){

1727

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1728

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

1729

ret_linux = klogctl(8, NULL, 5);

1730

if(ret_linux == -1){

1731

perror_plus("klogctl");

1732

} else {

1733

restore_loglevel = true;

1734

}

1675

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1676

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

1677

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

1678

bool restore_loglevel = true;

1679

if(ret_linux == -1){

1680

restore_loglevel = false;

1681

perror_plus("klogctl");

1735

1682

}

1736

1683

#endif /* __linux__ */

1737

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

1738

ioctl_errno = errno;

1684

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

1685

ret_errno = errno;

1739

1686

#ifdef __linux__

1740

1687

if(restore_loglevel){

1741

1688

ret_linux = klogctl(7, NULL, 0);

1745

1692

}

1746

1693

#endif /* __linux__ */

1747

1694

1748

/* If raise_privileges() succeeded above */

1749

if(ret_errno == 0){

1750

/* Lower privileges */

1751

ret_errno = lower_privileges();

1752

if(ret_errno != 0){

1753

errno = ret_errno;

1754

perror_plus("Failed to lower privileges");

1755

}

1756

}

1695

/* Lower privileges */

1696

lower_privileges();

1757

1697

1758

1698

/* Close the socket */

1759

1699

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

1762

1702

}

1763

1703

1764

1704

if(ret_setflags == -1){

1765

errno = ioctl_errno;

1705

errno = ret_errno;

1766

1706

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1767

1707

errno = old_errno;

1768

return ioctl_errno;

1708

return ret_errno;

1769

1709

}

1770

1710

} else if(debug){

1771

1711

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

1789

1729

return 0;

1790

1730

}

1791

1731

1792

__attribute__((nonnull, warn_unused_result))

1793

1732

error_t take_down_interface(const char *const interface){

1794

1733

error_t old_errno = errno;

1795

1734

struct ifreq network;

1800

1739

return ENXIO;

1801

1740

}

1802

1741

if(interface_is_up(interface)){

1803

error_t ret_errno = 0, ioctl_errno = 0;

1742

error_t ret_errno = 0;

1804

1743

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

1805

1744

ret_errno = errno;

1806

1745

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

1807

1746

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

1808

errno = old_errno;

1809

1747

return ret_errno;

1810

1748

}

1811

1749

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

1812

1750

1813

1751

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

1814

if(sd == -1){

1752

if(sd < 0){

1815

1753

ret_errno = errno;

1816

1754

perror_plus("socket");

1817

1755

errno = old_errno;

1823

1761

interface);

1824

1762

}

1825

1763

1826

/* Raise privileges */

1827

ret_errno = raise_privileges();

1828

if(ret_errno != 0){

1829

perror_plus("Failed to raise privileges");

1830

}

1764

/* Raise priviliges */

1765

raise_privileges();

1831

1766

1832

1767

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

1833

ioctl_errno = errno;

1768

ret_errno = errno;

1834

1769

1835

/* If raise_privileges() succeeded above */

1836

if(ret_errno == 0){

1837

/* Lower privileges */

1838

ret_errno = lower_privileges();

1839

if(ret_errno != 0){

1840

errno = ret_errno;

1841

perror_plus("Failed to lower privileges");

1842

}

1843

}

1770

/* Lower privileges */

1771

lower_privileges();

1844

1772

1845

1773

/* Close the socket */

1846

1774

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

1849

1777

}

1850

1778

1851

1779

if(ret_setflags == -1){

1852

errno = ioctl_errno;

1780

errno = ret_errno;

1853

1781

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1854

1782

errno = old_errno;

1855

return ioctl_errno;

1783

return ret_errno;

1856

1784

}

1857

1785

} else if(debug){

1858

1786

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

1866

1794

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

1867

1795

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

1868

1796

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

1869

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

1797

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

1870

1798

.interfaces = NULL, .interfaces_size = 0 };

1871

1799

AvahiSServiceBrowser *sb = NULL;

1872

1800

error_t ret_errno;

1876

1804

int exitcode = EXIT_SUCCESS;

1877

1805

char *interfaces_to_take_down = NULL;

1878

1806

size_t interfaces_to_take_down_size = 0;

1879

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

1880

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

1881

char *tempdir = NULL;

1807

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

1808

bool tempdir_created = false;

1882

1809

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1883

1810

const char *seckey = PATHDIR "/" SECKEY;

1884

1811

const char *pubkey = PATHDIR "/" PUBKEY;

2066

1993

/* Work around Debian bug #633582:

2067

1994

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

2068

1995

2069

/* Re-raise privileges */

2070

ret_errno = raise_privileges();

2071

if(ret_errno != 0){

2072

errno = ret_errno;

2073

perror_plus("Failed to raise privileges");

2074

} else {

1996

/* Re-raise priviliges */

1997

if(raise_privileges() == 0){

2075

1998

struct stat st;

2076

1999

2077

2000

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

2117

2040

}

2118

2041

2119

2042

/* Lower privileges */

2120

ret_errno = lower_privileges();

2121

if(ret_errno != 0){

2122

errno = ret_errno;

2123

perror_plus("Failed to lower privileges");

2124

}

2043

lower_privileges();

2125

2044

}

2126

2045

}

2127

2046

2153

2072

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

2154

2073

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

2155

2074

}

2156

run_network_hooks("start", interfaces_hooks != NULL ?

2157

interfaces_hooks : "", delay);

2075

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

2076

interfaces_hooks : "", delay)){

2077

goto end;

2078

}

2158

2079

}

2159

2080

2160

2081

if(not debug){

2288

2209

break;

2289

2210

}

2290

2211

bool interface_was_up = interface_is_up(interface);

2291

errno = bring_up_interface(interface, delay);

2212

ret = bring_up_interface(interface, delay);

2292

2213

if(not interface_was_up){

2293

if(errno != 0){

2214

if(ret != 0){

2215

errno = ret;

2294

2216

perror_plus("Failed to bring up interface");

2295

2217

} else {

2296

errno = argz_add(&interfaces_to_take_down,

2297

&interfaces_to_take_down_size,

2298

interface);

2299

if(errno != 0){

2218

ret_errno = argz_add(&interfaces_to_take_down,

2219

&interfaces_to_take_down_size,

2220

interface);

2221

if(ret_errno != 0){

2222

errno = ret_errno;

2300

2223

perror_plus("argz_add");

2301

2224

}

2302

2225

}

2333

2256

goto end;

2334

2257

}

2335

2258

2336

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

2337

tempdir = mkdtemp(run_tempdir);

2338

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

2339

if(debug){

2340

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

2341

run_tempdir, old_tempdir);

2342

}

2343

tempdir = mkdtemp(old_tempdir);

2344

}

2345

if(tempdir == NULL){

2259

if(mkdtemp(tempdir) == NULL){

2346

2260

perror_plus("mkdtemp");

2347

2261

goto end;

2348

2262

}

2263

tempdir_created = true;

2349

2264

2350

2265

if(quit_now){

2351

2266

goto end;

2426

2341

sleep((unsigned int)retry_interval);

2427

2342

}

2428

2343

2429

if(not quit_now){

2344

if (not quit_now){

2430

2345

exitcode = EXIT_SUCCESS;

2431

2346

}

2432

2347

2487

2402

if(debug){

2488

2403

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

2489

2404

}

2490

2405

2491

2406

ret = avahi_loop_with_timeout(simple_poll,

2492

2407

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

2493

2408

if(debug){

2534

2449

}

2535

2450

}

2536

2451

2537

/* Re-raise privileges */

2452

/* Re-raise priviliges */

2538

2453

{

2539

ret_errno = raise_privileges();

2540

if(ret_errno != 0){

2541

perror_plus("Failed to raise privileges");

2542

} else {

2543

2544

/* Run network hooks */

2545

run_network_hooks("stop", interfaces_hooks != NULL ?

2546

interfaces_hooks : "", delay);

2547

2548

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

2549

{

2550

char *interface = NULL;

2551

while((interface=argz_next(interfaces_to_take_down,

2552

interfaces_to_take_down_size,

2553

interface))){

2554

ret_errno = take_down_interface(interface);

2555

if(ret_errno != 0){

2556

errno = ret_errno;

2557

perror_plus("Failed to take down interface");

2558

}

2559

}

2560

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

2561

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

2562

" down\n");

2563

}

2564

}

2565

}

2566

2567

ret_errno = lower_privileges_permanently();

2568

if(ret_errno != 0){

2569

perror_plus("Failed to lower privileges permanently");

2570

}

2454

raise_privileges();

2455

2456

/* Run network hooks */

2457

run_network_hooks("stop", interfaces_hooks != NULL ?

2458

interfaces_hooks : "", delay);

2459

2460

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

2461

{

2462

char *interface = NULL;

2463

while((interface=argz_next(interfaces_to_take_down,

2464

interfaces_to_take_down_size,

2465

interface))){

2466

ret_errno = take_down_interface(interface);

2467

if(ret_errno != 0){

2468

errno = ret_errno;

2469

perror_plus("Failed to take down interface");

2470

}

2471

}

2472

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

2473

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

2474

" down\n");

2475

}

2476

}

2477

2478

lower_privileges_permanently();

2571

2479

}

2572

2480

2573

2481

free(interfaces_to_take_down);

2574

2482

free(interfaces_hooks);

2575

2483

2576

2484

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

2577

if(tempdir != NULL){

2485

if(tempdir_created){

2578

2486

struct dirent **direntries = NULL;

2579

2487

struct dirent *direntry = NULL;

2580

2488

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

2581

2489

alphasort);

2582

if(numentries > 0){

2490

if (numentries > 0){

2583

2491

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

2584

2492

direntry = direntries[i];

2585

2493

char *fullname = NULL;

2597

2505

free(fullname);

2598

2506

}

2599

2507

}

2600

2508

2601

2509

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

2602

2510

free(direntries);

2603

if(numentries == -1){

2511

if (numentries == -1){

2604

2512

perror_plus("scandir");

2605

2513

}

2606

2514

ret = rmdir(tempdir);