/mandos/trunk : revision 462

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

62

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

63

strtoimax() */

64

#include <assert.h> /* assert() */

65

#include <errno.h> /* perror(), errno, program_invocation_short_name */

65

#include <errno.h> /* perror(), errno */

66

#include <time.h> /* nanosleep(), time(), sleep() */

67

#include <net/if.h> /* ioctl, ifreq, SIOCGIFFLAGS, IFF_UP,

68

SIOCSIFFLAGS, if_indextoname(),

130

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

131

char *connect_to = NULL;

132

133

/* Doubly linked list that need to be circular linked when ever used */

134

typedef struct server{

135

const char *ip;

136

uint16_t port;

137

AvahiIfIndex if_index;

138

int af;

139

struct timespec last_seen;

140

struct server *next;

141

struct server *prev;

142

} server;

143

144

133

/* Used for passing in values through the Avahi callback functions */

145

134

typedef struct {

146

135

AvahiSimplePoll *simple_poll;

150

139

gnutls_dh_params_t dh_params;

151

140

const char *priority;

152

141

gpgme_ctx_t ctx;

153

server *current_server;

154

142

} mandos_context;

155

143

156

144

/* global context so signal handler can reach it*/

157

145

mandos_context mc = { .simple_poll = NULL, .server = NULL,

158

146

.dh_bits = 1024, .priority = "SECURE256"

159

":!CTYPE-X.509:+CTYPE-OPENPGP", .current_server = NULL };

147

":!CTYPE-X.509:+CTYPE-OPENPGP" };

160

148

161

149

sig_atomic_t quit_now = 0;

162

150

int signal_received = 0;

163

151

164

/* Function to use when printing errors */

165

void perror_plus(const char *print_text){

166

fprintf(stderr, "Mandos plugin %s: ", program_invocation_short_name);

167

perror(print_text);

168

}

169

170

152

/*

171

153

* Make additional room in "buffer" for at least BUFFER_SIZE more

172

154

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

184

166

return buffer_capacity;

185

167

}

186

168

187

int add_server(const char *ip, uint16_t port,

188

AvahiIfIndex if_index,

189

int af){

190

int ret;

191

server *new_server = malloc(sizeof(server));

192

if(new_server == NULL){

193

perror_plus("malloc");

194

return -1;

195

}

196

*new_server = (server){ .ip = strdup(ip),

197

.port = port,

198

.if_index = if_index,

199

.af = af };

200

if(new_server->ip == NULL){

201

perror_plus("strdup");

202

return -1;

203

}

204

/* uniqe case of first server */

205

if (mc.current_server == NULL){

206

new_server->next = new_server;

207

new_server->prev = new_server;

208

mc.current_server = new_server;

209

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

210

} else {

211

new_server->next = mc.current_server;

212

new_server->prev = mc.current_server->prev;

213

new_server->prev->next = new_server;

214

mc.current_server->prev = new_server;

215

}

216

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

217

if(ret == -1){

218

perror_plus("clock_gettime");

219

return -1;

220

}

221

return 0;

222

}

223

224

169

/*

225

170

* Initialize GPGME.

226

171

*/

240

185

241

186

fd = (int)TEMP_FAILURE_RETRY(open(filename, O_RDONLY));

242

187

if(fd == -1){

243

perror_plus("open");

188

perror("open");

244

189

return false;

245

190

}

246

191

260

205

261

206

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

262

207

if(ret == -1){

263

perror_plus("close");

208

perror("close");

264

209

}

265

210

gpgme_data_release(pgp_data);

266

211

return true;

391

336

392

337

/* Seek back to the beginning of the GPGME plaintext data buffer */

393

338

if(gpgme_data_seek(dh_plain, (off_t)0, SEEK_SET) == -1){

394

perror_plus("gpgme_data_seek");

339

perror("gpgme_data_seek");

395

340

plaintext_length = -1;

396

341

goto decrypt_end;

397

342

}

402

347

(size_t)plaintext_length,

403

348

plaintext_capacity);

404

349

if(plaintext_capacity == 0){

405

perror_plus("incbuffer");

350

perror("incbuffer");

406

351

plaintext_length = -1;

407

352

goto decrypt_end;

408

353

}

415

360

break;

416

361

}

417

362

if(ret < 0){

418

perror_plus("gpgme_data_read");

363

perror("gpgme_data_read");

419

364

plaintext_length = -1;

420

365

goto decrypt_end;

421

366

}

644

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

645

590

if(tcp_sd < 0){

646

591

int e = errno;

647

perror_plus("socket");

592

perror("socket");

648

593

errno = e;

649

594

goto mandos_end;

650

595

}

664

609

}

665

610

if(ret < 0 ){

666

611

int e = errno;

667

perror_plus("inet_pton");

612

perror("inet_pton");

668

613

errno = e;

669

614

goto mandos_end;

670

615

}

706

651

if(af == AF_INET6 and if_index != AVAHI_IF_UNSPEC){

707

652

char interface[IF_NAMESIZE];

708

653

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

709

perror_plus("if_indextoname");

654

perror("if_indextoname");

710

655

} else {

711

656

fprintf(stderr, "Connection to: %s%%%s, port %" PRIu16 "\n",

712

657

ip, interface, port);

726

671

sizeof(addrstr));

727

672

}

728

673

if(pcret == NULL){

729

perror_plus("inet_ntop");

674

perror("inet_ntop");

730

675

} else {

731

676

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

732

677

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

747

692

if(ret < 0){

748

693

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

749

694

int e = errno;

750

perror_plus("connect");

695

perror("connect");

751

696

errno = e;

752

697

}

753

698

goto mandos_end;

766

711

out_size - written));

767

712

if(ret == -1){

768

713

int e = errno;

769

perror_plus("write");

714

perror("write");

770

715

errno = e;

771

716

goto mandos_end;

772

717

}

796

741

errno = EINTR;

797

742

goto mandos_end;

798

743

}

799

800

/* Spurious warnings from -Wint-to-pointer-cast */

744

801

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

802

746

803

747

if(quit_now){

840

784

buffer_capacity);

841

785

if(buffer_capacity == 0){

842

786

int e = errno;

843

perror_plus("incbuffer");

787

perror("incbuffer");

844

788

errno = e;

845

789

goto mandos_end;

846

790

}

951

895

if(e == 0){

952

896

e = errno;

953

897

}

954

perror_plus("close");

898

perror("close");

955

899

}

956

900

gnutls_deinit(session);

957

errno = e;

958

901

if(quit_now){

959

errno = EINTR;

902

e = EINTR;

960

903

retval = -1;

961

904

}

905

errno = e;

962

906

}

963

907

return retval;

964

908

}

1007

951

avahi_proto_to_af(proto));

1008

952

if(ret == 0){

1009

953

avahi_simple_poll_quit(mc.simple_poll);

1010

} else {

1011

ret = add_server(ip, port, interface,

1012

avahi_proto_to_af(proto));

1013

954

}

1014

955

}

1015

956

}

1069

1010

}

1070

1011

}

1071

1012

1072

/* Signal handler that stops main loop after sigterm has been called */

1013

/* stop main loop after sigterm has been called */

1073

1014

static void handle_sigterm(int sig){

1074

1015

if(quit_now){

1075

1016

return;

1077

1018

quit_now = 1;

1078

1019

signal_received = sig;

1079

1020

int old_errno = errno;

1080

/* set main loop to exit */

1081

1021

if(mc.simple_poll != NULL){

1082

1022

avahi_simple_poll_quit(mc.simple_poll);

1083

1023

}

1092

1032

int good_interface(const struct dirent *if_entry){

1093

1033

ssize_t ssret;

1094

1034

char *flagname = NULL;

1095

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

1096

return 0;

1097

}

1098

1035

int ret = asprintf(&flagname, "%s/%s/flags", sys_class_net,

1099

1036

if_entry->d_name);

1100

1037

if(ret < 0){

1101

perror_plus("asprintf");

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1102

1042

return 0;

1103

1043

}

1104

1044

int flags_fd = (int)TEMP_FAILURE_RETRY(open(flagname, O_RDONLY));

1105

1045

if(flags_fd == -1){

1106

perror_plus("open");

1107

free(flagname);

1046

perror("open");

1108

1047

return 0;

1109

1048

}

1110

free(flagname);

1111

1049

typedef short ifreq_flags; /* ifreq.ifr_flags in netdevice(7) */

1112

1050

/* read line from flags_fd */

1113

1051

ssize_t to_read = (sizeof(ifreq_flags)*2)+3; /* "0x1003\n" */

1114

1052

char *flagstring = malloc((size_t)to_read+1); /* +1 for final \0 */

1115

1053

flagstring[(size_t)to_read] = '\0';

1116

1054

if(flagstring == NULL){

1117

perror_plus("malloc");

1055

perror("malloc");

1118

1056

close(flags_fd);

1119

1057

return 0;

1120

1058

}

1122

1060

ssret = (ssize_t)TEMP_FAILURE_RETRY(read(flags_fd, flagstring,

1123

1061

(size_t)to_read));

1124

1062

if(ssret == -1){

1125

perror_plus("read");

1063

perror("read");

1126

1064

free(flagstring);

1127

1065

close(flags_fd);

1128

1066

return 0;

1173

1111

}

1174

1112

return 0;

1175

1113

}

1176

/* Reject non-ARP interfaces (including dummy interfaces) */

1177

if(flags & IFF_NOARP){

1178

if(debug){

1179

fprintf(stderr, "Rejecting non-ARP interface \"%s\"\n",

1180

if_entry->d_name);

1181

}

1182

return 0;

1183

}

1184

1114

/* Accept this device */

1185

1115

if(debug){

1186

1116

fprintf(stderr, "Interface \"%s\" is acceptable\n",

1189

1119

return 1;

1190

1120

}

1191

1121

1192

int notdotentries(const struct dirent *direntry){

1193

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

1194

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

1195

and (direntry->d_name[1] == '\0'

1196

or (direntry->d_name[1] == '.'

1197

and direntry->d_name[2] == '\0'))){

1198

return 0;

1199

}

1200

return 1;

1201

}

1202

1203

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1204

int ret;

1205

struct timespec now;

1206

struct timespec waited_time;

1207

intmax_t block_time;

1208

1209

while(true){

1210

if(mc.current_server == NULL){

1211

if (debug){

1212

fprintf(stderr, "Wait until first server is found. No timeout!\n");

1213

}

1214

ret = avahi_simple_poll_iterate(s, -1);

1215

} else {

1216

if (debug){

1217

fprintf(stderr, "Check current_server if we should run it, or wait\n");

1218

}

1219

/* the current time */

1220

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1221

if(ret == -1){

1222

perror_plus("clock_gettime");

1223

return -1;

1224

}

1225

/* Calculating in ms how long time between now and server

1226

who we visted longest time ago. Now - last seen. */

1227

waited_time.tv_sec = now.tv_sec - mc.current_server->last_seen.tv_sec;

1228

waited_time.tv_nsec = now.tv_nsec - mc.current_server->last_seen.tv_nsec;

1229

/* total time is 10s/10000ms. Converting to s to ms by 1000/s, and ns to ms by divind by 1000000. */

1230

block_time = (retry_interval - ((intmax_t)waited_time.tv_sec * 1000)) - ((intmax_t)waited_time.tv_nsec / 1000000);

1231

1232

if (debug){

1233

fprintf(stderr, "Blocking for %ld ms\n", block_time);

1234

}

1235

1236

if(block_time <= 0){

1237

ret = start_mandos_communication(mc.current_server->ip,

1238

mc.current_server->port,

1239

mc.current_server->if_index,

1240

mc.current_server->af);

1241

if(ret == 0){

1242

avahi_simple_poll_quit(mc.simple_poll);

1243

return 0;

1244

}

1245

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

1246

if(ret == -1){

1247

perror_plus("clock_gettime");

1248

return -1;

1249

}

1250

mc.current_server = mc.current_server->next;

1251

block_time = 0; /* call avahi to find new mandos servers, but dont block */

1252

}

1253

1254

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

1255

}

1256

if(ret != 0){

1257

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

1258

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

1259

}

1260

}

1261

}

1262

}

1263

1264

1122

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

1265

1123

AvahiSServiceBrowser *sb = NULL;

1266

1124

int error;

1283

1141

bool gnutls_initialized = false;

1284

1142

bool gpgme_initialized = false;

1285

1143

float delay = 2.5f;

1286

double retry_interval = 10; /* 10s between retrying a server and checking again*/

1287

1144

1288

1145

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1289

1146

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1295

1152

errno = 0;

1296

1153

ret = setgid(gid);

1297

1154

if(ret == -1){

1298

perror_plus("setgid");

1155

perror("setgid");

1299

1156

}

1300

1157

1301

1158

/* Lower user privileges (temporarily) */

1302

1159

errno = 0;

1303

1160

ret = seteuid(uid);

1304

1161

if(ret == -1){

1305

perror_plus("seteuid");

1162

perror("seteuid");

1306

1163

}

1307

1164

1308

1165

if(quit_now){

1343

1200

.arg = "SECONDS",

1344

1201

.doc = "Maximum delay to wait for interface startup",

1345

1202

.group = 2 },

1346

{ .name = "retry", .key = 132,

1347

.arg = "SECONDS",

1348

.doc = "Retry interval used when denied by the mandos server",

1349

.group = 2 },

1350

1203

/*

1351

1204

* These reproduce what we would get without ARGP_NO_HELP

1352

1205

*/

1396

1249

if(errno != 0 or tmp == arg or *tmp != '\0'){

1397

1250

argp_error(state, "Bad delay");

1398

1251

}

1399

case 132: /* --retry */

1400

errno = 0;

1401

retry_interval = strtod(arg, &tmp);

1402

if(errno != 0 or tmp == arg or *tmp != '\0'

1403

or (retry_interval * 1000) > INT_MAX){

1404

argp_error(state, "Bad retry interval");

1405

}

1406

1252

break;

1407

1253

/*

1408

1254

* These reproduce what we would get without ARGP_NO_HELP

1436

1282

case ENOMEM:

1437

1283

default:

1438

1284

errno = ret;

1439

perror_plus("argp_parse");

1285

perror("argp_parse");

1440

1286

exitcode = EX_OSERR;

1441

1287

goto end;

1442

1288

case EINVAL:

1460

1306

fprintf(stderr, "Using interface \"%s\"\n", interface);

1461

1307

}

1462

1308

if(interface == NULL){

1463

perror_plus("malloc");

1309

perror("malloc");

1464

1310

free(direntries);

1465

1311

exitcode = EXIT_FAILURE;

1466

1312

goto end;

1488

1334

sigemptyset(&sigterm_action.sa_mask);

1489

1335

ret = sigaddset(&sigterm_action.sa_mask, SIGINT);

1490

1336

if(ret == -1){

1491

perror_plus("sigaddset");

1337

perror("sigaddset");

1492

1338

exitcode = EX_OSERR;

1493

1339

goto end;

1494

1340

}

1495

1341

ret = sigaddset(&sigterm_action.sa_mask, SIGHUP);

1496

1342

if(ret == -1){

1497

perror_plus("sigaddset");

1343

perror("sigaddset");

1498

1344

exitcode = EX_OSERR;

1499

1345

goto end;

1500

1346

}

1501

1347

ret = sigaddset(&sigterm_action.sa_mask, SIGTERM);

1502

1348

if(ret == -1){

1503

perror_plus("sigaddset");

1349

perror("sigaddset");

1504

1350

exitcode = EX_OSERR;

1505

1351

goto end;

1506

1352

}

1510

1356

*/

1511

1357

ret = sigaction(SIGINT, NULL, &old_sigterm_action);

1512

1358

if(ret == -1){

1513

perror_plus("sigaction");

1359

perror("sigaction");

1514

1360

return EX_OSERR;

1515

1361

}

1516

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1517

1363

ret = sigaction(SIGINT, &sigterm_action, NULL);

1518

1364

if(ret == -1){

1519

perror_plus("sigaction");

1365

perror("sigaction");

1520

1366

exitcode = EX_OSERR;

1521

1367

goto end;

1522

1368

}

1523

1369

}

1524

1370

ret = sigaction(SIGHUP, NULL, &old_sigterm_action);

1525

1371

if(ret == -1){

1526

perror_plus("sigaction");

1372

perror("sigaction");

1527

1373

return EX_OSERR;

1528

1374

}

1529

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1530

1376

ret = sigaction(SIGHUP, &sigterm_action, NULL);

1531

1377

if(ret == -1){

1532

perror_plus("sigaction");

1378

perror("sigaction");

1533

1379

exitcode = EX_OSERR;

1534

1380

goto end;

1535

1381

}

1536

1382

}

1537

1383

ret = sigaction(SIGTERM, NULL, &old_sigterm_action);

1538

1384

if(ret == -1){

1539

perror_plus("sigaction");

1385

perror("sigaction");

1540

1386

return EX_OSERR;

1541

1387

}

1542

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1543

1389

ret = sigaction(SIGTERM, &sigterm_action, NULL);

1544

1390

if(ret == -1){

1545

perror_plus("sigaction");

1391

perror("sigaction");

1546

1392

exitcode = EX_OSERR;

1547

1393

goto end;

1548

1394

}

1565

1411

errno = 0;

1566

1412

ret = seteuid(0);

1567

1413

if(ret == -1){

1568

perror_plus("seteuid");

1414

perror("seteuid");

1569

1415

}

1570

1416

1571

1417

#ifdef __linux__

1575

1421

bool restore_loglevel = true;

1576

1422

if(ret == -1){

1577

1423

restore_loglevel = false;

1578

perror_plus("klogctl");

1424

perror("klogctl");

1579

1425

}

1580

1426

#endif /* __linux__ */

1581

1427

1582

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1583

1429

if(sd < 0){

1584

perror_plus("socket");

1430

perror("socket");

1585

1431

exitcode = EX_OSERR;

1586

1432

#ifdef __linux__

1587

1433

if(restore_loglevel){

1588

1434

ret = klogctl(7, NULL, 0);

1589

1435

if(ret == -1){

1590

perror_plus("klogctl");

1436

perror("klogctl");

1591

1437

}

1592

1438

}

1593

1439

#endif /* __linux__ */

1595

1441

errno = 0;

1596

1442

ret = seteuid(uid);

1597

1443

if(ret == -1){

1598

perror_plus("seteuid");

1444

perror("seteuid");

1599

1445

}

1600

1446

goto end;

1601

1447

}

1602

1448

strcpy(network.ifr_name, interface);

1603

1449

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1604

1450

if(ret == -1){

1605

perror_plus("ioctl SIOCGIFFLAGS");

1451

perror("ioctl SIOCGIFFLAGS");

1606

1452

#ifdef __linux__

1607

1453

if(restore_loglevel){

1608

1454

ret = klogctl(7, NULL, 0);

1609

1455

if(ret == -1){

1610

perror_plus("klogctl");

1456

perror("klogctl");

1611

1457

}

1612

1458

}

1613

1459

#endif /* __linux__ */

1616

1462

errno = 0;

1617

1463

ret = seteuid(uid);

1618

1464

if(ret == -1){

1619

perror_plus("seteuid");

1465

perror("seteuid");

1620

1466

}

1621

1467

goto end;

1622

1468

}

1626

1472

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

1627

1473

if(ret == -1){

1628

1474

take_down_interface = false;

1629

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1630

1476

exitcode = EX_OSERR;

1631

1477

#ifdef __linux__

1632

1478

if(restore_loglevel){

1633

1479

ret = klogctl(7, NULL, 0);

1634

1480

if(ret == -1){

1635

perror_plus("klogctl");

1481

perror("klogctl");

1636

1482

}

1637

1483

}

1638

1484

#endif /* __linux__ */

1640

1486

errno = 0;

1641

1487

ret = seteuid(uid);

1642

1488

if(ret == -1){

1643

perror_plus("seteuid");

1489

perror("seteuid");

1644

1490

}

1645

1491

goto end;

1646

1492

}

1647

1493

}

1648

/* sleep checking until interface is running. Check every 0.25s, up to total time of delay */

1494

/* sleep checking until interface is running */

1649

1495

for(int i=0; i < delay * 4; i++){

1650

1496

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1651

1497

if(ret == -1){

1652

perror_plus("ioctl SIOCGIFFLAGS");

1498

perror("ioctl SIOCGIFFLAGS");

1653

1499

} else if(network.ifr_flags & IFF_RUNNING){

1654

1500

break;

1655

1501

}

1656

1502

struct timespec sleeptime = { .tv_nsec = 250000000 };

1657

1503

ret = nanosleep(&sleeptime, NULL);

1658

1504

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

1659

perror_plus("nanosleep");

1505

perror("nanosleep");

1660

1506

}

1661

1507

}

1662

1508

if(not take_down_interface){

1663

1509

/* We won't need the socket anymore */

1664

1510

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

1665

1511

if(ret == -1){

1666

perror_plus("close");

1512

perror("close");

1667

1513

}

1668

1514

}

1669

1515

#ifdef __linux__

1671

1517

/* Restores kernel loglevel to default */

1672

1518

ret = klogctl(7, NULL, 0);

1673

1519

if(ret == -1){

1674

perror_plus("klogctl");

1520

perror("klogctl");

1675

1521

}

1676

1522

}

1677

1523

#endif /* __linux__ */

1681

1527

/* Lower privileges */

1682

1528

ret = seteuid(uid);

1683

1529

if(ret == -1){

1684

perror_plus("seteuid");

1530

perror("seteuid");

1685

1531

}

1686

1532

} else {

1687

1533

/* Lower privileges permanently */

1688

1534

ret = setuid(uid);

1689

1535

if(ret == -1){

1690

perror_plus("setuid");

1536

perror("setuid");

1691

1537

}

1692

1538

}

1693

1539

}

1709

1555

goto end;

1710

1556

}

1711

1557

1558

tempdir_created = true;

1712

1559

if(mkdtemp(tempdir) == NULL){

1713

perror_plus("mkdtemp");

1560

tempdir_created = false;

1561

perror("mkdtemp");

1714

1562

goto end;

1715

1563

}

1716

tempdir_created = true;

1717

1564

1718

1565

if(quit_now){

1719

1566

goto end;

1779

1626

if(quit_now or ret == 0){

1780

1627

break;

1781

1628

}

1782

sleep((int)retry_interval or 1);

1629

sleep(15);

1783

1630

};

1784

1631

1785

1632

if (not quit_now){

1843

1690

if(debug){

1844

1691

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

1845

1692

}

1846

1847

ret = avahi_loop_with_timeout(mc.simple_poll, (int)(retry_interval * 1000));

1848

if(debug){

1849

fprintf(stderr, "avahi_loop_with_timeout exited %s\n",

1850

(ret == 0) ? "successfully" : "with error");

1851

}

1693

1694

avahi_simple_poll_loop(mc.simple_poll);

1852

1695

1853

1696

end:

1854

1697

1875

1718

if(gpgme_initialized){

1876

1719

gpgme_release(mc.ctx);

1877

1720

}

1878

1879

/* cleans up the circular linked list of mandos servers the client has seen */

1880

if(mc.current_server != NULL){

1881

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

1882

while(mc.current_server != NULL){

1883

server *next = mc.current_server->next;

1884

free(mc.current_server);

1885

mc.current_server = next;

1886

}

1887

}

1888

1721

1889

1722

/* Take down the network interface */

1890

1723

if(take_down_interface){

1892

1725

errno = 0;

1893

1726

ret = seteuid(0);

1894

1727

if(ret == -1){

1895

perror_plus("seteuid");

1728

perror("seteuid");

1896

1729

}

1897

1730

if(geteuid() == 0){

1898

1731

ret = ioctl(sd, SIOCGIFFLAGS, &network);

1899

1732

if(ret == -1){

1900

perror_plus("ioctl SIOCGIFFLAGS");

1733

perror("ioctl SIOCGIFFLAGS");

1901

1734

} else if(network.ifr_flags & IFF_UP) {

1902

1735

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

1903

1736

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

1904

1737

if(ret == -1){

1905

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1906

1739

}

1907

1740

}

1908

1741

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

1909

1742

if(ret == -1){

1910

perror_plus("close");

1743

perror("close");

1911

1744

}

1912

1745

/* Lower privileges permanently */

1913

1746

errno = 0;

1914

1747

ret = setuid(uid);

1915

1748

if(ret == -1){

1916

perror_plus("setuid");

1749

perror("setuid");

1917

1750

}

1918

1751

}

1919

1752

}

1920

1753

1921

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

1754

/* Removes the temp directory used by GPGME */

1922

1755

if(tempdir_created){

1923

struct dirent **direntries = NULL;

1924

struct dirent *direntry = NULL;

1925

ret = scandir(tempdir, &direntries, notdotentries, alphasort);

1926

if (ret > 0){

1927

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

1928

direntry = direntries[i];

1756

DIR *d;

1757

struct dirent *direntry;

1758

d = opendir(tempdir);

1759

if(d == NULL){

1760

if(errno != ENOENT){

1761

perror("opendir");

1762

}

1763

} else {

1764

while(true){

1765

direntry = readdir(d);

1766

if(direntry == NULL){

1767

break;

1768

}

1769

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

1770

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

1771

and (direntry->d_name[1] == '\0'

1772

or (direntry->d_name[1] == '.'

1773

and direntry->d_name[2] == '\0'))){

1774

continue;

1775

}

1929

1776

char *fullname = NULL;

1930

1777

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

1931

1778

direntry->d_name);

1932

1779

if(ret < 0){

1933

perror_plus("asprintf");

1780

perror("asprintf");

1934

1781

continue;

1935

1782

}

1936

1783

ret = remove(fullname);

1940

1787

}

1941

1788

free(fullname);

1942

1789

}

1943

}

1944

1945

/* need to be cleaned even if ret == 0 because man page dont specify */

1946

free(direntries);

1947

if (ret == -1){

1948

perror_plus("scandir");

1790

closedir(d);

1949

1791

}

1950

1792

ret = rmdir(tempdir);

1951

1793

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

1952

perror_plus("rmdir");

1794

perror("rmdir");

1953

1795

}

1954

1796

}

1955

1797

1960

1802

&old_sigterm_action,

1961

1803

NULL));

1962

1804

if(ret == -1){

1963

perror_plus("sigaction");

1805

perror("sigaction");

1964

1806

}

1965

1807

do {

1966

1808

ret = raise(signal_received);

1967

1809

} while(ret != 0 and errno == EINTR);

1968

1810

if(ret != 0){

1969

perror_plus("raise");

1811

perror("raise");

1970

1812

abort();

1971

1813

}

1972

1814

TEMP_FAILURE_RETRY(pause());