/mandos/release : revision 237.16.5

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

10

*

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* Everything else is

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13

12

13

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*

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

26

* along with this program. If not, see

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* <http://www.gnu.org/licenses/>.

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*

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* Contact the authors at <mandos@fukt.bsnet.se>.

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* Contact the authors at <mandos@recompile.se>.

30

*/

31

32

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof(), abort() */

46

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

47

strtof(), abort() */

48

#include <stdbool.h> /* bool, false, true */

49

#include <string.h> /* memset(), strcmp(), strlen(),

50

strerror(), asprintf(), strcpy() */

53

sockaddr_in6, PF_INET6,

54

SOCK_STREAM, uid_t, gid_t, open(),

55

opendir(), DIR */

56

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

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() */

62

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

63

strtoimax() */

64

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

65

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

66

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

65

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

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program_invocation_short_name */

67

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

67

68

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

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69

SIOCSIFFLAGS, if_indextoname(),

69

70

if_nametoindex(), IF_NAMESIZE */

73

74

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

74

75

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

75

76

setgid(), pause() */

76

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

77

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

77

78

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

78

79

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

79

80

argp_state, struct argp,

82

83

#include <signal.h> /* sigemptyset(), sigaddset(),

83

84

sigaction(), SIGTERM, sig_atomic_t,

84

85

raise() */

85

#include <sysexits.h> /* EX_OSERR, EX_USAGE */

86

#include <sysexits.h> /* EX_OSERR, EX_USAGE, EX_UNAVAILABLE,

87

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

88

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

WEXITSTATUS(), WTERMSIG() */

86

90

87

91

#ifdef __linux__

88

92

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

121

125

#define PATHDIR "/conf/conf.d/mandos"

122

126

#define SECKEY "seckey.txt"

123

127

#define PUBKEY "pubkey.txt"

128

#define HOOKDIR "/lib/mandos/network-hooks.d"

124

129

125

130

bool debug = false;

126

131

static const char mandos_protocol_version[] = "1";

127

132

const char *argp_program_version = "mandos-client " VERSION;

128

const char *argp_program_bug_address = "<mandos@fukt.bsnet.se>";

133

const char *argp_program_bug_address = "<mandos@recompile.se>";

134

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

135

char *connect_to = NULL;

136

const char *hookdir = HOOKDIR;

137

138

/* Doubly linked list that need to be circularly linked when used */

139

typedef struct server{

140

const char *ip;

141

uint16_t port;

142

AvahiIfIndex if_index;

143

int af;

144

struct timespec last_seen;

145

struct server *next;

146

struct server *prev;

147

} server;

129

148

130

149

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

131

150

typedef struct {

136

155

gnutls_dh_params_t dh_params;

137

156

const char *priority;

138

157

gpgme_ctx_t ctx;

158

server *current_server;

139

159

} mandos_context;

140

160

141

161

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

142

162

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

143

163

.dh_bits = 1024, .priority = "SECURE256"

144

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

164

":!CTYPE-X.509:+CTYPE-OPENPGP",

165

.current_server = NULL };

145

166

146

167

sig_atomic_t quit_now = 0;

147

168

int signal_received = 0;

148

169

170

/* Function to use when printing errors */

171

void perror_plus(const char *print_text){

172

fprintf(stderr, "Mandos plugin %s: ",

173

program_invocation_short_name);

174

perror(print_text);

175

}

176

149

177

/*

150

178

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

151

179

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

163

191

return buffer_capacity;

164

192

}

165

193

194

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

195

int add_server(const char *ip, uint16_t port,

196

AvahiIfIndex if_index,

197

int af){

198

int ret;

199

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

200

if(new_server == NULL){

201

perror_plus("malloc");

202

return -1;

203

}

204

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

205

.port = port,

206

.if_index = if_index,

207

.af = af };

208

if(new_server->ip == NULL){

209

perror_plus("strdup");

210

return -1;

211

}

212

/* Special case of first server */

213

if (mc.current_server == NULL){

214

new_server->next = new_server;

215

new_server->prev = new_server;

216

mc.current_server = new_server;

217

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

218

} else {

219

new_server->next = mc.current_server;

220

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

221

new_server->prev->next = new_server;

222

mc.current_server->prev = new_server;

223

}

224

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

225

if(ret == -1){

226

perror_plus("clock_gettime");

227

return -1;

228

}

229

return 0;

230

}

231

166

232

/*

167

233

* Initialize GPGME.

168

234

*/

182

248

183

249

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

184

250

if(fd == -1){

185

perror("open");

251

perror_plus("open");

186

252

return false;

187

253

}

188

254

189

255

rc = gpgme_data_new_from_fd(&pgp_data, fd);

190

256

if(rc != GPG_ERR_NO_ERROR){

191

fprintf(stderr, "bad gpgme_data_new_from_fd: %s: %s\n",

257

fprintf(stderr, "Mandos plugin mandos-client: "

258

"bad gpgme_data_new_from_fd: %s: %s\n",

192

259

gpgme_strsource(rc), gpgme_strerror(rc));

193

260

return false;

194

261

}

195

262

196

263

rc = gpgme_op_import(mc.ctx, pgp_data);

197

264

if(rc != GPG_ERR_NO_ERROR){

198

fprintf(stderr, "bad gpgme_op_import: %s: %s\n",

265

fprintf(stderr, "Mandos plugin mandos-client: "

266

"bad gpgme_op_import: %s: %s\n",

199

267

gpgme_strsource(rc), gpgme_strerror(rc));

200

268

return false;

201

269

}

202

270

203

271

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

204

272

if(ret == -1){

205

perror("close");

273

perror_plus("close");

206

274

}

207

275

gpgme_data_release(pgp_data);

208

276

return true;

209

277

}

210

278

211

279

if(debug){

212

fprintf(stderr, "Initializing GPGME\n");

280

fprintf(stderr, "Mandos plugin mandos-client: "

281

"Initializing GPGME\n");

213

282

}

214

283

215

284

/* Init GPGME */

216

285

gpgme_check_version(NULL);

217

286

rc = gpgme_engine_check_version(GPGME_PROTOCOL_OpenPGP);

218

287

if(rc != GPG_ERR_NO_ERROR){

219

fprintf(stderr, "bad gpgme_engine_check_version: %s: %s\n",

288

fprintf(stderr, "Mandos plugin mandos-client: "

289

"bad gpgme_engine_check_version: %s: %s\n",

220

290

gpgme_strsource(rc), gpgme_strerror(rc));

221

291

return false;

222

292

}

223

293

224

/* Set GPGME home directory for the OpenPGP engine only */

294

/* Set GPGME home directory for the OpenPGP engine only */

225

295

rc = gpgme_get_engine_info(&engine_info);

226

296

if(rc != GPG_ERR_NO_ERROR){

227

fprintf(stderr, "bad gpgme_get_engine_info: %s: %s\n",

297

fprintf(stderr, "Mandos plugin mandos-client: "

298

"bad gpgme_get_engine_info: %s: %s\n",

228

299

gpgme_strsource(rc), gpgme_strerror(rc));

229

300

return false;

230

301

}

237

308

engine_info = engine_info->next;

238

309

}

239

310

if(engine_info == NULL){

240

fprintf(stderr, "Could not set GPGME home dir to %s\n", tempdir);

311

fprintf(stderr, "Mandos plugin mandos-client: "

312

"Could not set GPGME home dir to %s\n", tempdir);

241

313

return false;

242

314

}

243

315

244

316

/* Create new GPGME "context" */

245

317

rc = gpgme_new(&(mc.ctx));

246

318

if(rc != GPG_ERR_NO_ERROR){

247

fprintf(stderr, "bad gpgme_new: %s: %s\n",

248

gpgme_strsource(rc), gpgme_strerror(rc));

319

fprintf(stderr, "Mandos plugin mandos-client: "

320

"bad gpgme_new: %s: %s\n", gpgme_strsource(rc),

321

gpgme_strerror(rc));

249

322

return false;

250

323

}

251

324

270

343

ssize_t plaintext_length = 0;

271

344

272

345

if(debug){

273

fprintf(stderr, "Trying to decrypt OpenPGP data\n");

346

fprintf(stderr, "Mandos plugin mandos-client: "

347

"Trying to decrypt OpenPGP data\n");

274

348

}

275

349

276

350

/* Create new GPGME data buffer from memory cryptotext */

277

351

rc = gpgme_data_new_from_mem(&dh_crypto, cryptotext, crypto_size,

278

352

0);

279

353

if(rc != GPG_ERR_NO_ERROR){

280

fprintf(stderr, "bad gpgme_data_new_from_mem: %s: %s\n",

354

fprintf(stderr, "Mandos plugin mandos-client: "

355

"bad gpgme_data_new_from_mem: %s: %s\n",

281

356

gpgme_strsource(rc), gpgme_strerror(rc));

282

357

return -1;

283

358

}

285

360

/* Create new empty GPGME data buffer for the plaintext */

286

361

rc = gpgme_data_new(&dh_plain);

287

362

if(rc != GPG_ERR_NO_ERROR){

288

fprintf(stderr, "bad gpgme_data_new: %s: %s\n",

363

fprintf(stderr, "Mandos plugin mandos-client: "

364

"bad gpgme_data_new: %s: %s\n",

289

365

gpgme_strsource(rc), gpgme_strerror(rc));

290

366

gpgme_data_release(dh_crypto);

291

367

return -1;

295

371

data buffer */

296

372

rc = gpgme_op_decrypt(mc.ctx, dh_crypto, dh_plain);

297

373

if(rc != GPG_ERR_NO_ERROR){

298

fprintf(stderr, "bad gpgme_op_decrypt: %s: %s\n",

374

fprintf(stderr, "Mandos plugin mandos-client: "

375

"bad gpgme_op_decrypt: %s: %s\n",

299

376

gpgme_strsource(rc), gpgme_strerror(rc));

300

377

plaintext_length = -1;

301

378

if(debug){

302

379

gpgme_decrypt_result_t result;

303

380

result = gpgme_op_decrypt_result(mc.ctx);

304

381

if(result == NULL){

305

fprintf(stderr, "gpgme_op_decrypt_result failed\n");

382

fprintf(stderr, "Mandos plugin mandos-client: "

383

"gpgme_op_decrypt_result failed\n");

306

384

} else {

307

fprintf(stderr, "Unsupported algorithm: %s\n",

385

fprintf(stderr, "Mandos plugin mandos-client: "

386

"Unsupported algorithm: %s\n",

308

387

result->unsupported_algorithm);

309

fprintf(stderr, "Wrong key usage: %u\n",

388

fprintf(stderr, "Mandos plugin mandos-client: "

389

"Wrong key usage: %u\n",

310

390

result->wrong_key_usage);

311

391

if(result->file_name != NULL){

312

fprintf(stderr, "File name: %s\n", result->file_name);

392

fprintf(stderr, "Mandos plugin mandos-client: "

393

"File name: %s\n", result->file_name);

313

394

}

314

395

gpgme_recipient_t recipient;

315

396

recipient = result->recipients;

316

397

while(recipient != NULL){

317

fprintf(stderr, "Public key algorithm: %s\n",

398

fprintf(stderr, "Mandos plugin mandos-client: "

399

"Public key algorithm: %s\n",

318

400

gpgme_pubkey_algo_name(recipient->pubkey_algo));

319

fprintf(stderr, "Key ID: %s\n", recipient->keyid);

320

fprintf(stderr, "Secret key available: %s\n",

401

fprintf(stderr, "Mandos plugin mandos-client: "

402

"Key ID: %s\n", recipient->keyid);

403

fprintf(stderr, "Mandos plugin mandos-client: "

404

"Secret key available: %s\n",

321

405

recipient->status == GPG_ERR_NO_SECKEY

322

406

? "No" : "Yes");

323

407

recipient = recipient->next;

328

412

}

329

413

330

414

if(debug){

331

fprintf(stderr, "Decryption of OpenPGP data succeeded\n");

415

fprintf(stderr, "Mandos plugin mandos-client: "

416

"Decryption of OpenPGP data succeeded\n");

332

417

}

333

418

334

419

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

335

420

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

336

perror("gpgme_data_seek");

421

perror_plus("gpgme_data_seek");

337

422

plaintext_length = -1;

338

423

goto decrypt_end;

339

424

}

344

429

(size_t)plaintext_length,

345

430

plaintext_capacity);

346

431

if(plaintext_capacity == 0){

347

perror("incbuffer");

432

perror_plus("incbuffer");

348

433

plaintext_length = -1;

349

434

goto decrypt_end;

350

435

}

357

442

break;

358

443

}

359

444

if(ret < 0){

360

perror("gpgme_data_read");

445

perror_plus("gpgme_data_read");

361

446

plaintext_length = -1;

362

447

goto decrypt_end;

363

448

}

365

450

}

366

451

367

452

if(debug){

368

fprintf(stderr, "Decrypted password is: ");

453

fprintf(stderr, "Mandos plugin mandos-client: "

454

"Decrypted password is: ");

369

455

for(ssize_t i = 0; i < plaintext_length; i++){

370

456

fprintf(stderr, "%02hhX ", (*plaintext)[i]);

371

457

}

393

479

/* GnuTLS log function callback */

394

480

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

395

481

const char* string){

396

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

482

fprintf(stderr, "Mandos plugin mandos-client: GnuTLS: %s", string);

397

483

}

398

484

399

485

static int init_gnutls_global(const char *pubkeyfilename,

401

487

int ret;

402

488

403

489

if(debug){

404

fprintf(stderr, "Initializing GnuTLS\n");

490

fprintf(stderr, "Mandos plugin mandos-client: "

491

"Initializing GnuTLS\n");

405

492

}

406

493

407

494

ret = gnutls_global_init();

408

495

if(ret != GNUTLS_E_SUCCESS){

409

fprintf(stderr, "GnuTLS global_init: %s\n",

410

safer_gnutls_strerror(ret));

496

fprintf(stderr, "Mandos plugin mandos-client: "

497

"GnuTLS global_init: %s\n", safer_gnutls_strerror(ret));

411

498

return -1;

412

499

}

413

500

420

507

}

421

508

422

509

/* OpenPGP credentials */

423

gnutls_certificate_allocate_credentials(&mc.cred);

510

ret = gnutls_certificate_allocate_credentials(&mc.cred);

424

511

if(ret != GNUTLS_E_SUCCESS){

425

fprintf(stderr, "GnuTLS memory error: %s\n", /* Spurious warning

426

from

427

-Wunreachable-code

428

*/

429

safer_gnutls_strerror(ret));

512

fprintf(stderr, "Mandos plugin mandos-client: "

513

"GnuTLS memory error: %s\n", safer_gnutls_strerror(ret));

430

514

gnutls_global_deinit();

431

515

return -1;

432

516

}

433

517

434

518

if(debug){

435

fprintf(stderr, "Attempting to use OpenPGP public key %s and"

519

fprintf(stderr, "Mandos plugin mandos-client: "

520

"Attempting to use OpenPGP public key %s and"

436

521

" secret key %s as GnuTLS credentials\n", pubkeyfilename,

437

522

seckeyfilename);

438

523

}

442

527

GNUTLS_OPENPGP_FMT_BASE64);

443

528

if(ret != GNUTLS_E_SUCCESS){

444

529

fprintf(stderr,

530

"Mandos plugin mandos-client: "

445

531

"Error[%d] while reading the OpenPGP key pair ('%s',"

446

532

" '%s')\n", ret, pubkeyfilename, seckeyfilename);

447

fprintf(stderr, "The GnuTLS error is: %s\n",

448

safer_gnutls_strerror(ret));

533

fprintf(stderr, "Mandos plugin mandos-client: "

534

"The GnuTLS error is: %s\n", safer_gnutls_strerror(ret));

449

535

goto globalfail;

450

536

}

451

537

452

538

/* GnuTLS server initialization */

453

539

ret = gnutls_dh_params_init(&mc.dh_params);

454

540

if(ret != GNUTLS_E_SUCCESS){

455

fprintf(stderr, "Error in GnuTLS DH parameter initialization:"

541

fprintf(stderr, "Mandos plugin mandos-client: "

542

"Error in GnuTLS DH parameter initialization:"

456

543

" %s\n", safer_gnutls_strerror(ret));

457

544

goto globalfail;

458

545

}

459

546

ret = gnutls_dh_params_generate2(mc.dh_params, mc.dh_bits);

460

547

if(ret != GNUTLS_E_SUCCESS){

461

fprintf(stderr, "Error in GnuTLS prime generation: %s\n",

548

fprintf(stderr, "Mandos plugin mandos-client: "

549

"Error in GnuTLS prime generation: %s\n",

462

550

safer_gnutls_strerror(ret));

463

551

goto globalfail;

464

552

}

485

573

}

486

574

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

487

575

if(ret != GNUTLS_E_SUCCESS){

488

fprintf(stderr, "Error in GnuTLS session initialization: %s\n",

576

fprintf(stderr, "Mandos plugin mandos-client: "

577

"Error in GnuTLS session initialization: %s\n",

489

578

safer_gnutls_strerror(ret));

490

579

}

491

580

499

588

}

500

589

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

501

590

if(ret != GNUTLS_E_SUCCESS){

502

fprintf(stderr, "Syntax error at: %s\n", err);

503

fprintf(stderr, "GnuTLS error: %s\n",

504

safer_gnutls_strerror(ret));

591

fprintf(stderr, "Mandos plugin mandos-client: "

592

"Syntax error at: %s\n", err);

593

fprintf(stderr, "Mandos plugin mandos-client: "

594

"GnuTLS error: %s\n", safer_gnutls_strerror(ret));

505

595

gnutls_deinit(*session);

506

596

return -1;

507

597

}

516

606

}

517

607

} while(ret == GNUTLS_E_INTERRUPTED or ret == GNUTLS_E_AGAIN);

518

608

if(ret != GNUTLS_E_SUCCESS){

519

fprintf(stderr, "Error setting GnuTLS credentials: %s\n",

609

fprintf(stderr, "Mandos plugin mandos-client: "

610

"Error setting GnuTLS credentials: %s\n",

520

611

safer_gnutls_strerror(ret));

521

612

gnutls_deinit(*session);

522

613

return -1;

553

644

gnutls_session_t session;

554

645

int pf; /* Protocol family */

555

646

647

errno = 0;

648

556

649

if(quit_now){

650

errno = EINTR;

557

651

return -1;

558

652

}

559

653

565

659

pf = PF_INET;

566

660

break;

567

661

default:

568

fprintf(stderr, "Bad address family: %d\n", af);

662

fprintf(stderr, "Mandos plugin mandos-client: "

663

"Bad address family: %d\n", af);

664

errno = EINVAL;

569

665

return -1;

570

666

}

571

667

575

671

}

576

672

577

673

if(debug){

578

fprintf(stderr, "Setting up a TCP connection to %s, port %" PRIu16

674

fprintf(stderr, "Mandos plugin mandos-client: "

675

"Setting up a TCP connection to %s, port %" PRIu16

579

676

"\n", ip, port);

580

677

}

581

678

582

679

tcp_sd = socket(pf, SOCK_STREAM, 0);

583

680

if(tcp_sd < 0){

584

perror("socket");

681

int e = errno;

682

perror_plus("socket");

683

errno = e;

585

684

goto mandos_end;

586

685

}

587

686

588

687

if(quit_now){

688

errno = EINTR;

589

689

goto mandos_end;

590

690

}

591

691

598

698

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

599

699

}

600

700

if(ret < 0 ){

601

perror("inet_pton");

701

int e = errno;

702

perror_plus("inet_pton");

703

errno = e;

602

704

goto mandos_end;

603

705

}

604

706

if(ret == 0){

605

fprintf(stderr, "Bad address: %s\n", ip);

707

int e = errno;

708

fprintf(stderr, "Mandos plugin mandos-client: "

709

"Bad address: %s\n", ip);

710

errno = e;

606

711

goto mandos_end;

607

712

}

608

713

if(af == AF_INET6){

614

719

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

615

720

-Wunreachable-code*/

616

721

if(if_index == AVAHI_IF_UNSPEC){

617

fprintf(stderr, "An IPv6 link-local address is incomplete"

722

fprintf(stderr, "Mandos plugin mandos-client: "

723

"An IPv6 link-local address is incomplete"

618

724

" without a network interface\n");

725

errno = EINVAL;

619

726

goto mandos_end;

620

727

}

621

728

/* Set the network interface number as scope */

628

735

}

629

736

630

737

if(quit_now){

738

errno = EINTR;

631

739

goto mandos_end;

632

740

}

633

741

635

743

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

636

744

char interface[IF_NAMESIZE];

637

745

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

638

perror("if_indextoname");

746

perror_plus("if_indextoname");

639

747

} else {

640

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

748

fprintf(stderr, "Mandos plugin mandos-client: "

749

"Connection to: %s%%%s, port %" PRIu16 "\n",

641

750

ip, interface, port);

642

751

}

643

752

} else {

644

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

645

port);

753

fprintf(stderr, "Mandos plugin mandos-client: "

754

"Connection to: %s, port %" PRIu16 "\n", ip, port);

646

755

}

647

756

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

648

757

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

655

764

sizeof(addrstr));

656

765

}

657

766

if(pcret == NULL){

658

perror("inet_ntop");

767

perror_plus("inet_ntop");

659

768

} else {

660

769

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

661

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

770

fprintf(stderr, "Mandos plugin mandos-client: "

771

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

662

772

}

663

773

}

664

774

}

665

775

666

776

if(quit_now){

777

errno = EINTR;

667

778

goto mandos_end;

668

779

}

669

780

673

784

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

674

785

}

675

786

if(ret < 0){

676

perror("connect");

787

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

788

int e = errno;

789

perror_plus("connect");

790

errno = e;

791

}

677

792

goto mandos_end;

678

793

}

679

794

680

795

if(quit_now){

796

errno = EINTR;

681

797

goto mandos_end;

682

798

}

683

799

688

804

ret = (int)TEMP_FAILURE_RETRY(write(tcp_sd, out + written,

689

805

out_size - written));

690

806

if(ret == -1){

691

perror("write");

807

int e = errno;

808

perror_plus("write");

809

errno = e;

692

810

goto mandos_end;

693

811

}

694

812

written += (size_t)ret;

704

822

}

705

823

706

824

if(quit_now){

825

errno = EINTR;

707

826

goto mandos_end;

708

827

}

709

828

}

710

829

711

830

if(debug){

712

fprintf(stderr, "Establishing TLS session with %s\n", ip);

831

fprintf(stderr, "Mandos plugin mandos-client: "

832

"Establishing TLS session with %s\n", ip);

713

833

}

714

834

715

835

if(quit_now){

836

errno = EINTR;

716

837

goto mandos_end;

717

838

}

718

839

840

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

719

841

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

720

842

721

843

if(quit_now){

844

errno = EINTR;

722

845

goto mandos_end;

723

846

}

724

847

725

848

do {

726

849

ret = gnutls_handshake(session);

727

850

if(quit_now){

851

errno = EINTR;

728

852

goto mandos_end;

729

853

}

730

854

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

731

855

732

856

if(ret != GNUTLS_E_SUCCESS){

733

857

if(debug){

734

fprintf(stderr, "*** GnuTLS Handshake failed ***\n");

858

fprintf(stderr, "Mandos plugin mandos-client: "

859

"*** GnuTLS Handshake failed ***\n");

735

860

gnutls_perror(ret);

736

861

}

862

errno = EPROTO;

737

863

goto mandos_end;

738

864

}

739

865

740

866

/* Read OpenPGP packet that contains the wanted password */

741

867

742

868

if(debug){

743

fprintf(stderr, "Retrieving OpenPGP encrypted password from %s\n",

744

ip);

869

fprintf(stderr, "Mandos plugin mandos-client: "

870

"Retrieving OpenPGP encrypted password from %s\n", ip);

745

871

}

746

872

747

873

while(true){

748

874

749

875

if(quit_now){

876

errno = EINTR;

750

877

goto mandos_end;

751

878

}

752

879

753

880

buffer_capacity = incbuffer(&buffer, buffer_length,

754

881

buffer_capacity);

755

882

if(buffer_capacity == 0){

756

perror("incbuffer");

883

int e = errno;

884

perror_plus("incbuffer");

885

errno = e;

757

886

goto mandos_end;

758

887

}

759

888

760

889

if(quit_now){

890

errno = EINTR;

761

891

goto mandos_end;

762

892

}

763

893

776

906

ret = gnutls_handshake(session);

777

907

778

908

if(quit_now){

909

errno = EINTR;

779

910

goto mandos_end;

780

911

}

781

912

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

782

913

if(ret < 0){

783

fprintf(stderr, "*** GnuTLS Re-handshake failed ***\n");

914

fprintf(stderr, "Mandos plugin mandos-client: "

915

"*** GnuTLS Re-handshake failed ***\n");

784

916

gnutls_perror(ret);

917

errno = EPROTO;

785

918

goto mandos_end;

786

919

}

787

920

break;

788

921

default:

789

fprintf(stderr, "Unknown error while reading data from"

922

fprintf(stderr, "Mandos plugin mandos-client: "

923

"Unknown error while reading data from"

790

924

" encrypted session with Mandos server\n");

791

925

gnutls_bye(session, GNUTLS_SHUT_RDWR);

926

errno = EIO;

792

927

goto mandos_end;

793

928

}

794

929

} else {

797

932

}

798

933

799

934

if(debug){

800

fprintf(stderr, "Closing TLS session\n");

935

fprintf(stderr, "Mandos plugin mandos-client: "

936

"Closing TLS session\n");

801

937

}

802

938

803

939

if(quit_now){

940

errno = EINTR;

804

941

goto mandos_end;

805

942

}

806

943

807

944

do {

808

945

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

809

946

if(quit_now){

947

errno = EINTR;

810

948

goto mandos_end;

811

949

}

812

950

} while(ret == GNUTLS_E_AGAIN or ret == GNUTLS_E_INTERRUPTED);

821

959

written = 0;

822

960

while(written < (size_t) decrypted_buffer_size){

823

961

if(quit_now){

962

errno = EINTR;

824

963

goto mandos_end;

825

964

}

826

965

828

967

(size_t)decrypted_buffer_size - written,

829

968

stdout);

830

969

if(ret == 0 and ferror(stdout)){

970

int e = errno;

831

971

if(debug){

832

fprintf(stderr, "Error writing encrypted data: %s\n",

972

fprintf(stderr, "Mandos plugin mandos-client: "

973

"Error writing encrypted data: %s\n",

833

974

strerror(errno));

834

975

}

976

errno = e;

835

977

goto mandos_end;

836

978

}

837

979

written += (size_t)ret;

843

985

/* Shutdown procedure */

844

986

845

987

mandos_end:

846

free(decrypted_buffer);

847

free(buffer);

848

if(tcp_sd >= 0){

849

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

850

}

851

if(ret == -1){

852

perror("close");

853

}

854

gnutls_deinit(session);

855

if(quit_now){

856

retval = -1;

988

{

989

int e = errno;

990

free(decrypted_buffer);

991

free(buffer);

992

if(tcp_sd >= 0){

993

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

994

}

995

if(ret == -1){

996

if(e == 0){

997

e = errno;

998

}

999

perror_plus("close");

1000

}

1001

gnutls_deinit(session);

1002

errno = e;

1003

if(quit_now){

1004

errno = EINTR;

1005

retval = -1;

1006

}

857

1007

}

858

1008

return retval;

859

1009

}

884

1034

switch(event){

885

1035

default:

886

1036

case AVAHI_RESOLVER_FAILURE:

887

fprintf(stderr, "(Avahi Resolver) Failed to resolve service '%s'"

1037

fprintf(stderr, "Mandos plugin mandos-client: "

1038

"(Avahi Resolver) Failed to resolve service '%s'"

888

1039

" of type '%s' in domain '%s': %s\n", name, type, domain,

889

1040

avahi_strerror(avahi_server_errno(mc.server)));

890

1041

break;

894

1045

char ip[AVAHI_ADDRESS_STR_MAX];

895

1046

avahi_address_snprint(ip, sizeof(ip), address);

896

1047

if(debug){

897

fprintf(stderr, "Mandos server \"%s\" found on %s (%s, %"

1048

fprintf(stderr, "Mandos plugin mandos-client: "

1049

"Mandos server \"%s\" found on %s (%s, %"

898

1050

PRIdMAX ") on port %" PRIu16 "\n", name, host_name,

899

1051

ip, (intmax_t)interface, port);

900

1052

}

902

1054

avahi_proto_to_af(proto));

903

1055

if(ret == 0){

904

1056

avahi_simple_poll_quit(mc.simple_poll);

1057

} else {

1058

ret = add_server(ip, port, interface,

1059

avahi_proto_to_af(proto));

905

1060

}

906

1061

}

907

1062

}

931

1086

default:

932

1087

case AVAHI_BROWSER_FAILURE:

933

1088

934

fprintf(stderr, "(Avahi browser) %s\n",

1089

fprintf(stderr, "Mandos plugin mandos-client: "

1090

"(Avahi browser) %s\n",

935

1091

avahi_strerror(avahi_server_errno(mc.server)));

936

1092

avahi_simple_poll_quit(mc.simple_poll);

937

1093

return;

945

1101

if(avahi_s_service_resolver_new(mc.server, interface, protocol,

946

1102

name, type, domain, protocol, 0,

947

1103

resolve_callback, NULL) == NULL)

948

fprintf(stderr, "Avahi: Failed to resolve service '%s': %s\n",

1104

fprintf(stderr, "Mandos plugin mandos-client: "

1105

"Avahi: Failed to resolve service '%s': %s\n",

949

1106

name, avahi_strerror(avahi_server_errno(mc.server)));

950

1107

break;

951

1108

955

1112

case AVAHI_BROWSER_ALL_FOR_NOW:

956

1113

case AVAHI_BROWSER_CACHE_EXHAUSTED:

957

1114

if(debug){

958

fprintf(stderr, "No Mandos server found, still searching...\n");

1115

fprintf(stderr, "Mandos plugin mandos-client: "

1116

"No Mandos server found, still searching...\n");

959

1117

}

960

1118

break;

961

1119

}

962

1120

}

963

1121

964

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

1122

/* Signal handler that stops main loop after SIGTERM */

965

1123

static void handle_sigterm(int sig){

966

1124

if(quit_now){

967

1125

return;

969

1127

quit_now = 1;

970

1128

signal_received = sig;

971

1129

int old_errno = errno;

1130

/* set main loop to exit */

972

1131

if(mc.simple_poll != NULL){

973

1132

avahi_simple_poll_quit(mc.simple_poll);

974

1133

}

975

1134

errno = old_errno;

976

1135

}

977

1136

1137

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

1138

int ret;

1139

1140

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

1141

if(s < 0){

1142

perror_plus("socket");

1143

return false;

1144

}

1145

strcpy(ifr->ifr_name, ifname);

1146

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1147

if(ret == -1){

1148

if(debug){

1149

perror_plus("ioctl SIOCGIFFLAGS");

1150

}

1151

return false;

1152

}

1153

return true;

1154

}

1155

1156

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

1157

1158

/* Reject the loopback device */

1159

if(ifr->ifr_flags & IFF_LOOPBACK){

1160

if(debug){

1161

fprintf(stderr, "Mandos plugin mandos-client: "

1162

"Rejecting loopback interface \"%s\"\n", ifname);

1163

}

1164

return false;

1165

}

1166

/* Accept point-to-point devices only if connect_to is specified */

1167

if(connect_to != NULL and (ifr->ifr_flags & IFF_POINTOPOINT)){

1168

if(debug){

1169

fprintf(stderr, "Mandos plugin mandos-client: "

1170

"Accepting point-to-point interface \"%s\"\n", ifname);

1171

}

1172

return true;

1173

}

1174

/* Otherwise, reject non-broadcast-capable devices */

1175

if(not (ifr->ifr_flags & IFF_BROADCAST)){

1176

if(debug){

1177

fprintf(stderr, "Mandos plugin mandos-client: "

1178

"Rejecting non-broadcast interface \"%s\"\n", ifname);

1179

}

1180

return false;

1181

}

1182

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

1183

if(ifr->ifr_flags & IFF_NOARP){

1184

if(debug){

1185

fprintf(stderr, "Mandos plugin mandos-client: "

1186

"Rejecting non-ARP interface \"%s\"\n", ifname);

1187

}

1188

return false;

1189

}

1190

1191

/* Accept this device */

1192

if(debug){

1193

fprintf(stderr, "Mandos plugin mandos-client: "

1194

"Interface \"%s\" is good\n", ifname);

1195

}

1196

return true;

1197

}

1198

1199

/*

1200

* This function determines if a directory entry in /sys/class/net

1201

* corresponds to an acceptable network device.

1202

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

1203

*/

1204

int good_interface(const struct dirent *if_entry){

1205

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

1206

return 0;

1207

}

1208

1209

struct ifreq ifr;

1210

if(not get_flags(if_entry->d_name, &ifr)){

1211

if(debug){

1212

fprintf(stderr, "Mandos plugin mandos-client: "

1213

"Failed to get flags for interface \"%s\"\n",

1214

if_entry->d_name);

1215

}

1216

return 0;

1217

}

1218

1219

if(not good_flags(if_entry->d_name, &ifr)){

1220

return 0;

1221

}

1222

return 1;

1223

}

1224

1225

/*

1226

* This function determines if a directory entry in /sys/class/net

1227

* corresponds to an acceptable network device which is up.

1228

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

1229

*/

1230

int up_interface(const struct dirent *if_entry){

1231

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

1232

return 0;

1233

}

1234

1235

struct ifreq ifr;

1236

if(not get_flags(if_entry->d_name, &ifr)){

1237

if(debug){

1238

fprintf(stderr, "Mandos plugin mandos-client: "

1239

"Failed to get flags for interface \"%s\"\n",

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

/* Reject down interfaces */

1246

if(not (ifr.ifr_flags & IFF_UP)){

1247

if(debug){

1248

fprintf(stderr, "Mandos plugin mandos-client: "

1249

"Rejecting down interface \"%s\"\n",

1250

if_entry->d_name);

1251

}

1252

return 0;

1253

}

1254

1255

/* Reject non-running interfaces */

1256

if(not (ifr.ifr_flags & IFF_RUNNING)){

1257

if(debug){

1258

fprintf(stderr, "Mandos plugin mandos-client: "

1259

"Rejecting non-running interface \"%s\"\n",

1260

if_entry->d_name);

1261

}

1262

return 0;

1263

}

1264

1265

if(not good_flags(if_entry->d_name, &ifr)){

1266

return 0;

1267

}

1268

return 1;

1269

}

1270

1271

int notdotentries(const struct dirent *direntry){

1272

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

1273

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

1274

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

1275

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

1276

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

1277

return 0;

1278

}

1279

return 1;

1280

}

1281

1282

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

1283

int runnable_hook(const struct dirent *direntry){

1284

int ret;

1285

struct stat st;

1286

1287

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

1288

/* Empty name? */

1289

return 0;

1290

}

1291

1292

/* Save pointer to last character */

1293

char *end = strchr(direntry->d_name, '\0')-1;

1294

1295

if(*end == '~'){

1296

/* Backup name~ */

1297

return 0;

1298

}

1299

1300

if(((direntry->d_name)[0] == '#')

1301

and (*end == '#')){

1302

/* Temporary #name# */

1303

return 0;

1304

}

1305

1306

/* XXX more rules here */

1307

1308

char *fullname = NULL;

1309

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

1310

direntry->d_name);

1311

if(ret < 0){

1312

perror_plus("asprintf");

1313

return 0;

1314

}

1315

1316

ret = stat(fullname, &st);

1317

if(ret == -1){

1318

if(debug){

1319

perror_plus("Could not stat plugin");

1320

}

1321

return 0;

1322

}

1323

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

1324

/* Not a regular file */

1325

return 0;

1326

}

1327

if(not (st.st_mode & (S_IXUSR | S_IXGRP | S_IXOTH))){

1328

/* Not executable */

1329

return 0;

1330

}

1331

return 1;

1332

}

1333

1334

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1335

int ret;

1336

struct timespec now;

1337

struct timespec waited_time;

1338

intmax_t block_time;

1339

1340

while(true){

1341

if(mc.current_server == NULL){

1342

if (debug){

1343

fprintf(stderr, "Mandos plugin mandos-client: "

1344

"Wait until first server is found. No timeout!\n");

1345

}

1346

ret = avahi_simple_poll_iterate(s, -1);

1347

} else {

1348

if (debug){

1349

fprintf(stderr, "Mandos plugin mandos-client: "

1350

"Check current_server if we should run it,"

1351

" or wait\n");

1352

}

1353

/* the current time */

1354

ret = clock_gettime(CLOCK_MONOTONIC, &now);

1355

if(ret == -1){

1356

perror_plus("clock_gettime");

1357

return -1;

1358

}

1359

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

1360

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

1361

waited_time.tv_sec = (now.tv_sec

1362

- mc.current_server->last_seen.tv_sec);

1363

waited_time.tv_nsec = (now.tv_nsec

1364

- mc.current_server->last_seen.tv_nsec);

1365

/* total time is 10s/10,000ms.

1366

Converting to s from ms by dividing by 1,000,

1367

and ns to ms by dividing by 1,000,000. */

1368

block_time = ((retry_interval

1369

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

1370

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

1371

1372

if (debug){

1373

fprintf(stderr, "Mandos plugin mandos-client: "

1374

"Blocking for %" PRIdMAX " ms\n", block_time);

1375

}

1376

1377

if(block_time <= 0){

1378

ret = start_mandos_communication(mc.current_server->ip,

1379

mc.current_server->port,

1380

mc.current_server->if_index,

1381

mc.current_server->af);

1382

if(ret == 0){

1383

avahi_simple_poll_quit(mc.simple_poll);

1384

return 0;

1385

}

1386

ret = clock_gettime(CLOCK_MONOTONIC,

1387

&mc.current_server->last_seen);

1388

if(ret == -1){

1389

perror_plus("clock_gettime");

1390

return -1;

1391

}

1392

mc.current_server = mc.current_server->next;

1393

block_time = 0; /* Call avahi to find new Mandos

1394

servers, but don't block */

1395

}

1396

1397

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

1398

}

1399

if(ret != 0){

1400

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

1401

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

1402

}

1403

}

1404

}

1405

}

1406

978

1407

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

979

1408

AvahiSServiceBrowser *sb = NULL;

980

1409

int error;

982

1411

intmax_t tmpmax;

983

1412

char *tmp;

984

1413

int exitcode = EXIT_SUCCESS;

985

const char *interface = "eth0";

1414

const char *interface = "";

986

1415

struct ifreq network;

987

1416

int sd = -1;

988

1417

bool take_down_interface = false;

989

1418

uid_t uid;

990

1419

gid_t gid;

991

char *connect_to = NULL;

992

1420

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

993

1421

bool tempdir_created = false;

994

1422

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

998

1426

bool gnutls_initialized = false;

999

1427

bool gpgme_initialized = false;

1000

1428

float delay = 2.5f;

1429

double retry_interval = 10; /* 10s between trying a server and

1430

retrying the same server again */

1001

1431

1002

1432

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

1003

1433

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1009

1439

errno = 0;

1010

1440

ret = setgid(gid);

1011

1441

if(ret == -1){

1012

perror("setgid");

1442

perror_plus("setgid");

1013

1443

}

1014

1444

1015

1445

/* Lower user privileges (temporarily) */

1016

1446

errno = 0;

1017

1447

ret = seteuid(uid);

1018

1448

if(ret == -1){

1019

perror("seteuid");

1449

perror_plus("seteuid");

1020

1450

}

1021

1451

1022

1452

if(quit_now){

1057

1487

.arg = "SECONDS",

1058

1488

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

1059

1489

.group = 2 },

1490

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

1491

.arg = "SECONDS",

1492

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

1493

.group = 2 },

1494

{ .name = "network-hook-dir", .key = 133,

1495

.arg = "DIR",

1496

.doc = "Directory where network hooks are located",

1497

.group = 2 },

1060

1498

/*

1061

1499

* These reproduce what we would get without ARGP_NO_HELP

1062

1500

*/

1106

1544

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

1107

1545

argp_error(state, "Bad delay");

1108

1546

}

1547

case 132: /* --retry */

1548

errno = 0;

1549

retry_interval = strtod(arg, &tmp);

1550

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

1551

or (retry_interval * 1000) > INT_MAX

1552

or retry_interval < 0){

1553

argp_error(state, "Bad retry interval");

1554

}

1555

break;

1556

case 133: /* --network-hook-dir */

1557

hookdir = arg;

1109

1558

break;

1110

1559

/*

1111

1560

* These reproduce what we would get without ARGP_NO_HELP

1118

1567

argp_state_help(state, state->out_stream,

1119

1568

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1120

1569

case 'V': /* --version */

1570

fprintf(state->out_stream, "Mandos plugin mandos-client: ");

1121

1571

fprintf(state->out_stream, "%s\n", argp_program_version);

1122

1572

exit(argp_err_exit_status);

1123

1573

break;

1139

1589

case ENOMEM:

1140

1590

default:

1141

1591

errno = ret;

1142

perror("argp_parse");

1592

perror_plus("argp_parse");

1143

1593

exitcode = EX_OSERR;

1144

1594

goto end;

1145

1595

case EINVAL:

1147

1597

goto end;

1148

1598

}

1149

1599

}

1600

1601

{

1602

/* Work around Debian bug #633582:

1603

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

1604

struct stat st;

1605

1606

/* Re-raise priviliges */

1607

errno = 0;

1608

ret = seteuid(0);

1609

if(ret == -1){

1610

perror_plus("seteuid");

1611

}

1612

1613

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

1614

int seckey_fd = open(seckey, O_RDONLY);

1615

if(seckey_fd == -1){

1616

perror_plus("open");

1617

} else {

1618

ret = (int)TEMP_FAILURE_RETRY(fstat(seckey_fd, &st));

1619

if(ret == -1){

1620

perror_plus("fstat");

1621

} else {

1622

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1623

ret = fchown(seckey_fd, uid, gid);

1624

if(ret == -1){

1625

perror_plus("fchown");

1626

}

1627

}

1628

}

1629

TEMP_FAILURE_RETRY(close(seckey_fd));

1630

}

1631

}

1632

1633

if(strcmp(pubkey, PATHDIR "/" PUBKEY) == 0){

1634

int pubkey_fd = open(pubkey, O_RDONLY);

1635

if(pubkey_fd == -1){

1636

perror_plus("open");

1637

} else {

1638

ret = (int)TEMP_FAILURE_RETRY(fstat(pubkey_fd, &st));

1639

if(ret == -1){

1640

perror_plus("fstat");

1641

} else {

1642

if(S_ISREG(st.st_mode) and st.st_uid == 0 and st.st_gid == 0){

1643

ret = fchown(pubkey_fd, uid, gid);

1644

if(ret == -1){

1645

perror_plus("fchown");

1646

}

1647

}

1648

}

1649

TEMP_FAILURE_RETRY(close(pubkey_fd));

1650

}

1651

}

1652

1653

/* Lower privileges */

1654

errno = 0;

1655

ret = seteuid(uid);

1656

if(ret == -1){

1657

perror_plus("seteuid");

1658

}

1659

}

1660

1661

/* Find network hooks and run them */

1662

{

1663

struct dirent **direntries;

1664

struct dirent *direntry;

1665

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

1666

alphasort);

1667

if(numhooks == -1){

1668

perror_plus("scandir");

1669

} else {

1670

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

1671

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

1672

direntry = direntries[0];

1673

char *fullname = NULL;

1674

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

1675

if(ret < 0){

1676

perror_plus("asprintf");

1677

continue;

1678

}

1679

pid_t hook_pid = fork();

1680

if(hook_pid == 0){

1681

/* Child */

1682

dup2(devnull, STDIN_FILENO);

1683

close(devnull);

1684

dup2(STDERR_FILENO, STDOUT_FILENO);

1685

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

1686

if(ret == -1){

1687

perror_plus("setenv");

1688

exit(1);

1689

}

1690

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

1691

if(ret == -1){

1692

perror_plus("setenv");

1693

exit(1);

1694

}

1695

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

1696

if(ret == -1){

1697

perror_plus("setenv");

1698

exit(1);

1699

}

1700

char *delaystring;

1701

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

1702

if(ret == -1){

1703

perror_plus("asprintf");

1704

exit(1);

1705

}

1706

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

1707

if(ret == -1){

1708

free(delaystring);

1709

perror_plus("setenv");

1710

exit(1);

1711

}

1712

free(delaystring);

1713

ret = execl(fullname, direntry->d_name, "start", NULL);

1714

perror_plus("execl");

1715

} else {

1716

int status;

1717

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

1718

perror_plus("waitpid");

1719

free(fullname);

1720

continue;

1721

}

1722

if(WIFEXITED(status)){

1723

if(WEXITSTATUS(status) != 0){

1724

fprintf(stderr, "Mandos plugin mandos-client: "

1725

"Warning: network hook \"%s\" exited"

1726

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

1727

WEXITSTATUS(status));

1728

free(fullname);

1729

continue;

1730

}

1731

} else if(WIFSIGNALED(status)){

1732

fprintf(stderr, "Mandos plugin mandos-client: "

1733

"Warning: network hook \"%s\" died by"

1734

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

1735

WTERMSIG(status));

1736

free(fullname);

1737

continue;

1738

} else {

1739

fprintf(stderr, "Mandos plugin mandos-client: "

1740

"Warning: network hook \"%s\" crashed\n",

1741

direntry->d_name);

1742

free(fullname);

1743

continue;

1744

}

1745

}

1746

free(fullname);

1747

if(quit_now){

1748

goto end;

1749

}

1750

}

1751

close(devnull);

1752

}

1753

}

1150

1754

1151

1755

if(not debug){

1152

1756

avahi_set_log_function(empty_log);

1153

1757

}

1154

1758

1759

if(interface[0] == '\0'){

1760

struct dirent **direntries;

1761

/* First look for interfaces that are up */

1762

ret = scandir(sys_class_net, &direntries, up_interface,

1763

alphasort);

1764

if(ret == 0){

1765

/* No up interfaces, look for any good interfaces */

1766

free(direntries);

1767

ret = scandir(sys_class_net, &direntries, good_interface,

1768

alphasort);

1769

}

1770

if(ret >= 1){

1771

/* Pick the first interface returned */

1772

interface = strdup(direntries[0]->d_name);

1773

if(debug){

1774

fprintf(stderr, "Mandos plugin mandos-client: "

1775

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

1776

}

1777

if(interface == NULL){

1778

perror_plus("malloc");

1779

free(direntries);

1780

exitcode = EXIT_FAILURE;

1781

goto end;

1782

}

1783

free(direntries);

1784

} else {

1785

free(direntries);

1786

fprintf(stderr, "Mandos plugin mandos-client: "

1787

"Could not find a network interface\n");

1788

exitcode = EXIT_FAILURE;

1789

goto end;

1790

}

1791

}

1792

1155

1793

/* Initialize Avahi early so avahi_simple_poll_quit() can be called

1156

1794

from the signal handler */

1157

1795

/* Initialize the pseudo-RNG for Avahi */

1158

1796

srand((unsigned int) time(NULL));

1159

1797

mc.simple_poll = avahi_simple_poll_new();

1160

1798

if(mc.simple_poll == NULL){

1161

fprintf(stderr, "Avahi: Failed to create simple poll object.\n");

1162

exitcode = EXIT_FAILURE;

1799

fprintf(stderr, "Mandos plugin mandos-client: "

1800

"Avahi: Failed to create simple poll object.\n");

1801

exitcode = EX_UNAVAILABLE;

1163

1802

goto end;

1164

1803

}

1165

1804

1166

1805

sigemptyset(&sigterm_action.sa_mask);

1167

1806

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

1168

1807

if(ret == -1){

1169

perror("sigaddset");

1170

exitcode = EXIT_FAILURE;

1808

perror_plus("sigaddset");

1809

exitcode = EX_OSERR;

1171

1810

goto end;

1172

1811

}

1173

1812

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

1174

1813

if(ret == -1){

1175

perror("sigaddset");

1176

exitcode = EXIT_FAILURE;

1814

perror_plus("sigaddset");

1815

exitcode = EX_OSERR;

1177

1816

goto end;

1178

1817

}

1179

1818

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

1180

1819

if(ret == -1){

1181

perror("sigaddset");

1182

exitcode = EXIT_FAILURE;

1820

perror_plus("sigaddset");

1821

exitcode = EX_OSERR;

1183

1822

goto end;

1184

1823

}

1185

1824

/* Need to check if the handler is SIG_IGN before handling:

1188

1827

*/

1189

1828

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

1190

1829

if(ret == -1){

1191

perror("sigaction");

1192

return EXIT_FAILURE;

1830

perror_plus("sigaction");

1831

return EX_OSERR;

1193

1832

}

1194

1833

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

1834

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

1196

1835

if(ret == -1){

1197

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1836

perror_plus("sigaction");

1837

exitcode = EX_OSERR;

1199

1838

goto end;

1200

1839

}

1201

1840

}

1202

1841

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

1203

1842

if(ret == -1){

1204

perror("sigaction");

1205

return EXIT_FAILURE;

1843

perror_plus("sigaction");

1844

return EX_OSERR;

1206

1845

}

1207

1846

if(old_sigterm_action.sa_handler != SIG_IGN){

1208

1847

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

1209

1848

if(ret == -1){

1210

perror("sigaction");

1211

exitcode = EXIT_FAILURE;

1849

perror_plus("sigaction");

1850

exitcode = EX_OSERR;

1212

1851

goto end;

1213

1852

}

1214

1853

}

1215

1854

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

1216

1855

if(ret == -1){

1217

perror("sigaction");

1218

return EXIT_FAILURE;

1856

perror_plus("sigaction");

1857

return EX_OSERR;

1219

1858

}

1220

1859

if(old_sigterm_action.sa_handler != SIG_IGN){

1221

1860

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

1222

1861

if(ret == -1){

1223

perror("sigaction");

1224

exitcode = EXIT_FAILURE;

1862

perror_plus("sigaction");

1863

exitcode = EX_OSERR;

1225

1864

goto end;

1226

1865

}

1227

1866

}

1228

1867

1229

1868

/* If the interface is down, bring it up */

1230

if(interface[0] != '\0'){

1869

if(strcmp(interface, "none") != 0){

1231

1870

if_index = (AvahiIfIndex) if_nametoindex(interface);

1232

1871

if(if_index == 0){

1233

fprintf(stderr, "No such interface: \"%s\"\n", interface);

1234

exitcode = EXIT_FAILURE;

1872

fprintf(stderr, "Mandos plugin mandos-client: "

1873

"No such interface: \"%s\"\n", interface);

1874

exitcode = EX_UNAVAILABLE;

1235

1875

goto end;

1236

1876

}

1237

1877

1243

1883

errno = 0;

1244

1884

ret = seteuid(0);

1245

1885

if(ret == -1){

1246

perror("seteuid");

1886

perror_plus("seteuid");

1247

1887

}

1248

1888

1249

1889

#ifdef __linux__

1253

1893

bool restore_loglevel = true;

1254

1894

if(ret == -1){

1255

1895

restore_loglevel = false;

1256

perror("klogctl");

1896

perror_plus("klogctl");

1257

1897

}

1258

1898

#endif /* __linux__ */

1259

1899

1260

1900

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1261

1901

if(sd < 0){

1262

perror("socket");

1263

exitcode = EXIT_FAILURE;

1902

perror_plus("socket");

1903

exitcode = EX_OSERR;

1264

1904

#ifdef __linux__

1265

1905

if(restore_loglevel){

1266

1906

ret = klogctl(7, NULL, 0);

1267

1907

if(ret == -1){

1268

perror("klogctl");

1908

perror_plus("klogctl");

1269

1909

}

1270

1910

}

1271

1911

#endif /* __linux__ */

1273

1913

errno = 0;

1274

1914

ret = seteuid(uid);

1275

1915

if(ret == -1){

1276

perror("seteuid");

1916

perror_plus("seteuid");

1277

1917

}

1278

1918

goto end;

1279

1919

}

1280

1920

strcpy(network.ifr_name, interface);

1281

1921

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

1282

1922

if(ret == -1){

1283

perror("ioctl SIOCGIFFLAGS");

1923

perror_plus("ioctl SIOCGIFFLAGS");

1284

1924

#ifdef __linux__

1285

1925

if(restore_loglevel){

1286

1926

ret = klogctl(7, NULL, 0);

1287

1927

if(ret == -1){

1288

perror("klogctl");

1928

perror_plus("klogctl");

1289

1929

}

1290

1930

}

1291

1931

#endif /* __linux__ */

1292

exitcode = EXIT_FAILURE;

1932

exitcode = EX_OSERR;

1293

1933

/* Lower privileges */

1294

1934

errno = 0;

1295

1935

ret = seteuid(uid);

1296

1936

if(ret == -1){

1297

perror("seteuid");

1937

perror_plus("seteuid");

1298

1938

}

1299

1939

goto end;

1300

1940

}

1304

1944

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

1305

1945

if(ret == -1){

1306

1946

take_down_interface = false;

1307

perror("ioctl SIOCSIFFLAGS");

1308

exitcode = EXIT_FAILURE;

1947

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1948

exitcode = EX_OSERR;

1309

1949

#ifdef __linux__

1310

1950

if(restore_loglevel){

1311

1951

ret = klogctl(7, NULL, 0);

1312

1952

if(ret == -1){

1313

perror("klogctl");

1953

perror_plus("klogctl");

1314

1954

}

1315

1955

}

1316

1956

#endif /* __linux__ */

1318

1958

errno = 0;

1319

1959

ret = seteuid(uid);

1320

1960

if(ret == -1){

1321

perror("seteuid");

1961

perror_plus("seteuid");

1322

1962

}

1323

1963

goto end;

1324

1964

}

1325

1965

}

1326

/* sleep checking until interface is running */

1966

/* Sleep checking until interface is running.

1967

Check every 0.25s, up to total time of delay */

1327

1968

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

1328

1969

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

1329

1970

if(ret == -1){

1330

perror("ioctl SIOCGIFFLAGS");

1971

perror_plus("ioctl SIOCGIFFLAGS");

1331

1972

} else if(network.ifr_flags & IFF_RUNNING){

1332

1973

break;

1333

1974

}

1334

1975

struct timespec sleeptime = { .tv_nsec = 250000000 };

1335

1976

ret = nanosleep(&sleeptime, NULL);

1336

1977

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

1337

perror("nanosleep");

1978

perror_plus("nanosleep");

1338

1979

}

1339

1980

}

1340

1981

if(not take_down_interface){

1341

1982

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

1342

1983

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

1343

1984

if(ret == -1){

1344

perror("close");

1985

perror_plus("close");

1345

1986

}

1346

1987

}

1347

1988

#ifdef __linux__

1349

1990

/* Restores kernel loglevel to default */

1350

1991

ret = klogctl(7, NULL, 0);

1351

1992

if(ret == -1){

1352

perror("klogctl");

1993

perror_plus("klogctl");

1353

1994

}

1354

1995

}

1355

1996

#endif /* __linux__ */

1359

2000

/* Lower privileges */

1360

2001

ret = seteuid(uid);

1361

2002

if(ret == -1){

1362

perror("seteuid");

2003

perror_plus("seteuid");

1363

2004

}

1364

2005

} else {

1365

2006

/* Lower privileges permanently */

1366

2007

ret = setuid(uid);

1367

2008

if(ret == -1){

1368

perror("setuid");

2009

perror_plus("setuid");

1369

2010

}

1370

2011

}

1371

2012

}

1376

2017

1377

2018

ret = init_gnutls_global(pubkey, seckey);

1378

2019

if(ret == -1){

1379

fprintf(stderr, "init_gnutls_global failed\n");

1380

exitcode = EXIT_FAILURE;

2020

fprintf(stderr, "Mandos plugin mandos-client: "

2021

"init_gnutls_global failed\n");

2022

exitcode = EX_UNAVAILABLE;

1381

2023

goto end;

1382

2024

} else {

1383

2025

gnutls_initialized = true;

1387

2029

goto end;

1388

2030

}

1389

2031

2032

if(mkdtemp(tempdir) == NULL){

2033

perror_plus("mkdtemp");

2034

goto end;

2035

}

1390

2036

tempdir_created = true;

1391

if(mkdtemp(tempdir) == NULL){

1392

tempdir_created = false;

1393

perror("mkdtemp");

1394

goto end;

1395

}

1396

2037

1397

2038

if(quit_now){

1398

2039

goto end;

1399

2040

}

1400

2041

1401

2042

if(not init_gpgme(pubkey, seckey, tempdir)){

1402

fprintf(stderr, "init_gpgme failed\n");

1403

exitcode = EXIT_FAILURE;

2043

fprintf(stderr, "Mandos plugin mandos-client: "

2044

"init_gpgme failed\n");

2045

exitcode = EX_UNAVAILABLE;

1404

2046

goto end;

1405

2047

} else {

1406

2048

gpgme_initialized = true;

1415

2057

/* (Mainly meant for debugging) */

1416

2058

char *address = strrchr(connect_to, ':');

1417

2059

if(address == NULL){

1418

fprintf(stderr, "No colon in address\n");

1419

exitcode = EXIT_FAILURE;

2060

fprintf(stderr, "Mandos plugin mandos-client: "

2061

"No colon in address\n");

2062

exitcode = EX_USAGE;

1420

2063

goto end;

1421

2064

}

1422

2065

1429

2072

tmpmax = strtoimax(address+1, &tmp, 10);

1430

2073

if(errno != 0 or tmp == address+1 or *tmp != '\0'

1431

2074

or tmpmax != (uint16_t)tmpmax){

1432

fprintf(stderr, "Bad port number\n");

1433

exitcode = EXIT_FAILURE;

2075

fprintf(stderr, "Mandos plugin mandos-client: "

2076

"Bad port number\n");

2077

exitcode = EX_USAGE;

1434

2078

goto end;

1435

2079

}

1436

2080

1440

2084

1441

2085

port = (uint16_t)tmpmax;

1442

2086

*address = '\0';

1443

address = connect_to;

1444

2087

/* Colon in address indicates IPv6 */

1445

2088

int af;

1446

if(strchr(address, ':') != NULL){

2089

if(strchr(connect_to, ':') != NULL){

1447

2090

af = AF_INET6;

2091

/* Accept [] around IPv6 address - see RFC 5952 */

2092

if(connect_to[0] == '[' and address[-1] == ']')

2093

{

2094

connect_to++;

2095

address[-1] = '\0';

2096

}

1448

2097

} else {

1449

2098

af = AF_INET;

1450

2099

}

2100

address = connect_to;

1451

2101

1452

2102

if(quit_now){

1453

2103

goto end;

1454

2104

}

1455

2105

1456

ret = start_mandos_communication(address, port, if_index, af);

1457

if(ret < 0){

1458

exitcode = EXIT_FAILURE;

1459

} else {

2106

while(not quit_now){

2107

ret = start_mandos_communication(address, port, if_index, af);

2108

if(quit_now or ret == 0){

2109

break;

2110

}

2111

if(debug){

2112

fprintf(stderr, "Mandos plugin mandos-client: "

2113

"Retrying in %d seconds\n", (int)retry_interval);

2114

}

2115

sleep((int)retry_interval);

2116

}

2117

2118

if (not quit_now){

1460

2119

exitcode = EXIT_SUCCESS;

1461

2120

}

2121

1462

2122

goto end;

1463

2123

}

1464

2124

1486

2146

1487

2147

/* Check if creating the Avahi server object succeeded */

1488

2148

if(mc.server == NULL){

1489

fprintf(stderr, "Failed to create Avahi server: %s\n",

2149

fprintf(stderr, "Mandos plugin mandos-client: "

2150

"Failed to create Avahi server: %s\n",

1490

2151

avahi_strerror(error));

1491

exitcode = EXIT_FAILURE;

2152

exitcode = EX_UNAVAILABLE;

1492

2153

goto end;

1493

2154

}

1494

2155

1501

2162

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

1502

2163

NULL, 0, browse_callback, NULL);

1503

2164

if(sb == NULL){

1504

fprintf(stderr, "Failed to create service browser: %s\n",

2165

fprintf(stderr, "Mandos plugin mandos-client: "

2166

"Failed to create service browser: %s\n",

1505

2167

avahi_strerror(avahi_server_errno(mc.server)));

1506

exitcode = EXIT_FAILURE;

2168

exitcode = EX_UNAVAILABLE;

1507

2169

goto end;

1508

2170

}

1509

2171

1514

2176

/* Run the main loop */

1515

2177

1516

2178

if(debug){

1517

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

1518

}

1519

1520

avahi_simple_poll_loop(mc.simple_poll);

2179

fprintf(stderr, "Mandos plugin mandos-client: "

2180

"Starting Avahi loop search\n");

2181

}

2182

2183

ret = avahi_loop_with_timeout(mc.simple_poll,

2184

(int)(retry_interval * 1000));

2185

if(debug){

2186

fprintf(stderr, "Mandos plugin mandos-client: "

2187

"avahi_loop_with_timeout exited %s\n",

2188

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

2189

}

1521

2190

1522

2191

end:

1523

2192

1524

2193

if(debug){

1525

fprintf(stderr, "%s exiting\n", argv[0]);

2194

fprintf(stderr, "Mandos plugin mandos-client: "

2195

"%s exiting\n", argv[0]);

1526

2196

}

1527

2197

1528

2198

/* Cleanup things */

1544

2214

if(gpgme_initialized){

1545

2215

gpgme_release(mc.ctx);

1546

2216

}

2217

2218

/* Cleans up the circular linked list of Mandos servers the client

2219

has seen */

2220

if(mc.current_server != NULL){

2221

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

2222

while(mc.current_server != NULL){

2223

server *next = mc.current_server->next;

2224

free(mc.current_server);

2225

mc.current_server = next;

2226

}

2227

}

2228

2229

/* XXX run network hooks "stop" here */

1547

2230

1548

2231

/* Take down the network interface */

1549

2232

if(take_down_interface){

1551

2234

errno = 0;

1552

2235

ret = seteuid(0);

1553

2236

if(ret == -1){

1554

perror("seteuid");

2237

perror_plus("seteuid");

1555

2238

}

1556

2239

if(geteuid() == 0){

1557

2240

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

1558

2241

if(ret == -1){

1559

perror("ioctl SIOCGIFFLAGS");

1560

} else if(network.ifr_flags & IFF_UP) {

2242

perror_plus("ioctl SIOCGIFFLAGS");

2243

} else if(network.ifr_flags & IFF_UP){

1561

2244

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

1562

2245

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

1563

2246

if(ret == -1){

1564

perror("ioctl SIOCSIFFLAGS");

2247

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1565

2248

}

1566

2249

}

1567

2250

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

1568

2251

if(ret == -1){

1569

perror("close");

2252

perror_plus("close");

1570

2253

}

1571

2254

/* Lower privileges permanently */

1572

2255

errno = 0;

1573

2256

ret = setuid(uid);

1574

2257

if(ret == -1){

1575

perror("setuid");

2258

perror_plus("setuid");

1576

2259

}

1577

2260

}

1578

2261

}

1579

2262

1580

/* Removes the temp directory used by GPGME */

2263

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

1581

2264

if(tempdir_created){

1582

DIR *d;

1583

struct dirent *direntry;

1584

d = opendir(tempdir);

1585

if(d == NULL){

1586

if(errno != ENOENT){

1587

perror("opendir");

1588

}

1589

} else {

1590

while(true){

1591

direntry = readdir(d);

1592

if(direntry == NULL){

1593

break;

1594

}

1595

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

1596

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

1597

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

1598

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

1599

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

1600

continue;

1601

}

2265

struct dirent **direntries = NULL;

2266

struct dirent *direntry = NULL;

2267

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

2268

alphasort);

2269

if (numentries > 0){

2270

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

2271

direntry = direntries[i];

1602

2272

char *fullname = NULL;

1603

2273

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

1604

2274

direntry->d_name);

1605

2275

if(ret < 0){

1606

perror("asprintf");

2276

perror_plus("asprintf");

1607

2277

continue;

1608

2278

}

1609

2279

ret = remove(fullname);

1610

2280

if(ret == -1){

1611

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

1612

strerror(errno));

2281

fprintf(stderr, "Mandos plugin mandos-client: "

2282

"remove(\"%s\"): %s\n", fullname, strerror(errno));

1613

2283

}

1614

2284

free(fullname);

1615

2285

}

1616

closedir(d);

2286

}

2287

2288

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

2289

free(direntries);

2290

if (numentries == -1){

2291

perror_plus("scandir");

1617

2292

}

1618

2293

ret = rmdir(tempdir);

1619

2294

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

1620

perror("rmdir");

2295

perror_plus("rmdir");

1621

2296

}

1622

2297

}

1623

2298

1628

2303

&old_sigterm_action,

1629

2304

NULL));

1630

2305

if(ret == -1){

1631

perror("sigaction");

2306

perror_plus("sigaction");

1632

2307

}

1633

2308

do {

1634

2309

ret = raise(signal_received);

1635

2310

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

1636

2311

if(ret != 0){

1637

perror("raise");

2312

perror_plus("raise");

1638

2313

abort();

1639

2314

}

1640

2315

TEMP_FAILURE_RETRY(pause());