/mandos/trunk : revision 594.1.4

9

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

10

*

11

* Everything else is

12

13

12

13

14

*

15

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

16

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

32

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

33

#ifndef _LARGEFILE_SOURCE

34

#define _LARGEFILE_SOURCE

35

#endif /* not _LARGEFILE_SOURCE */

35

#endif

36

#ifndef _FILE_OFFSET_BITS

37

#define _FILE_OFFSET_BITS 64

38

#endif /* not _FILE_OFFSET_BITS */

38

#endif

39

40

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

41

42

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

43

stdout, ferror() */

43

stdout, ferror(), remove() */

44

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

45

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

46

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

55

opendir(), DIR */

56

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

57

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

58

inet_pton(), connect(),

59

getnameinfo() */

60

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

58

inet_pton(), connect() */

59

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

61

60

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

62

61

*/

63

62

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

64

63

strtoimax() */

64

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

65

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

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program_invocation_short_name */

67

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

73

*/

74

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

75

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

76

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

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unlinkat() */

78

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

76

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

77

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

79

78

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

80

79

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

81

80

argp_state, struct argp,

93

92

argz_delete(), argz_append(),

94

93

argz_stringify(), argz_add(),

95

94

argz_count() */

96

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

97

EAI_SYSTEM, gai_strerror() */

98

95

99

96

#ifdef __linux__

100

97

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

142

139

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

143

140

char *connect_to = NULL;

144

141

const char *hookdir = HOOKDIR;

145

int hookdir_fd = -1;

146

142

uid_t uid = 65534;

147

143

gid_t gid = 65534;

148

144

149

145

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

150

146

typedef struct server{

151

147

const char *ip;

152

in_port_t port;

148

uint16_t port;

153

149

AvahiIfIndex if_index;

154

150

int af;

155

151

struct timespec last_seen;

159

155

160

156

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

161

157

typedef struct {

158

AvahiSimplePoll *simple_poll;

162

159

AvahiServer *server;

163

160

gnutls_certificate_credentials_t cred;

164

161

unsigned int dh_bits;

166

163

const char *priority;

167

164

gpgme_ctx_t ctx;

168

165

server *current_server;

169

char *interfaces;

170

size_t interfaces_size;

171

166

} mandos_context;

172

167

173

/* global so signal handler can reach it*/

174

AvahiSimplePoll *simple_poll;

168

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

169

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

170

.dh_bits = 1024, .priority = "SECURE256"

171

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

172

.current_server = NULL };

175

173

176

174

sig_atomic_t quit_now = 0;

177

175

int signal_received = 0;

185

183

perror(print_text);

186

184

}

187

185

188

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

186

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

189

187

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

190

188

va_list ap;

191

189

va_start (ap, format);

192

190

193

191

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

194

192

program_invocation_short_name));

195

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

193

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

196

194

}

197

195

198

196

/*

200

198

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

201

199

* "buffer_length" is how much is already used.

202

200

*/

203

__attribute__((nonnull, warn_unused_result))

204

201

size_t incbuffer(char **buffer, size_t buffer_length,

205

202

size_t buffer_capacity){

206

203

if(buffer_length + BUFFER_SIZE > buffer_capacity){

207

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

208

if(new_buf == NULL){

209

int old_errno = errno;

210

free(*buffer);

211

errno = old_errno;

212

*buffer = NULL;

204

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

205

if(buffer == NULL){

213

206

return 0;

214

207

}

215

*buffer = new_buf;

216

208

buffer_capacity += BUFFER_SIZE;

217

209

}

218

210

return buffer_capacity;

219

211

}

220

212

221

213

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

222

__attribute__((nonnull, warn_unused_result))

223

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

224

int af, server **current_server){

214

bool add_server(const char *ip, uint16_t port, AvahiIfIndex if_index,

215

int af){

225

216

int ret;

226

217

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

227

218

if(new_server == NULL){

234

225

.af = af };

235

226

if(new_server->ip == NULL){

236

227

perror_plus("strdup");

237

free(new_server);

238

return false;

239

}

240

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

241

if(ret == -1){

242

perror_plus("clock_gettime");

243

#ifdef __GNUC__

244

#pragma GCC diagnostic push

245

#pragma GCC diagnostic ignored "-Wcast-qual"

246

#endif

247

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

248

#ifdef __GNUC__

249

#pragma GCC diagnostic pop

250

#endif

251

free(new_server);

252

228

return false;

253

229

}

254

230

/* Special case of first server */

255

if(*current_server == NULL){

231

if (mc.current_server == NULL){

256

232

new_server->next = new_server;

257

233

new_server->prev = new_server;

258

*current_server = new_server;

234

mc.current_server = new_server;

235

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

259

236

} else {

260

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

261

new_server->next = *current_server;

262

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

237

new_server->next = mc.current_server;

238

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

263

239

new_server->prev->next = new_server;

264

(*current_server)->prev = new_server;

240

mc.current_server->prev = new_server;

241

}

242

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

243

if(ret == -1){

244

perror_plus("clock_gettime");

245

return false;

265

246

}

266

247

return true;

267

248

}

269

250

/*

270

251

* Initialize GPGME.

271

252

*/

272

__attribute__((nonnull, warn_unused_result))

273

static bool init_gpgme(const char * const seckey,

274

const char * const pubkey,

275

const char * const tempdir,

276

mandos_context *mc){

253

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

254

const char *tempdir){

277

255

gpgme_error_t rc;

278

256

gpgme_engine_info_t engine_info;

279

257

258

280

259

/*

281

260

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

282

261

*/

283

bool import_key(const char * const filename){

262

bool import_key(const char *filename){

284

263

int ret;

285

264

int fd;

286

265

gpgme_data_t pgp_data;

298

277

return false;

299

278

}

300

279

301

rc = gpgme_op_import(mc->ctx, pgp_data);

280

rc = gpgme_op_import(mc.ctx, pgp_data);

302

281

if(rc != GPG_ERR_NO_ERROR){

303

282

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

304

283

gpgme_strsource(rc), gpgme_strerror(rc));

348

327

}

349

328

350

329

/* Create new GPGME "context" */

351

rc = gpgme_new(&(mc->ctx));

330

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

352

331

if(rc != GPG_ERR_NO_ERROR){

353

332

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

354

333

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

367

346

* Decrypt OpenPGP data.

368

347

* Returns -1 on error

369

348

*/

370

__attribute__((nonnull, warn_unused_result))

371

349

static ssize_t pgp_packet_decrypt(const char *cryptotext,

372

350

size_t crypto_size,

373

char **plaintext,

374

mandos_context *mc){

351

char **plaintext){

375

352

gpgme_data_t dh_crypto, dh_plain;

376

353

gpgme_error_t rc;

377

354

ssize_t ret;

403

380

404

381

/* Decrypt data from the cryptotext data buffer to the plaintext

405

382

data buffer */

406

rc = gpgme_op_decrypt(mc->ctx, dh_crypto, dh_plain);

383

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

407

384

if(rc != GPG_ERR_NO_ERROR){

408

385

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

409

386

gpgme_strsource(rc), gpgme_strerror(rc));

410

387

plaintext_length = -1;

411

388

if(debug){

412

389

gpgme_decrypt_result_t result;

413

result = gpgme_op_decrypt_result(mc->ctx);

390

result = gpgme_op_decrypt_result(mc.ctx);

414

391

if(result == NULL){

415

392

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

416

393

} else {

493

470

return plaintext_length;

494

471

}

495

472

496

__attribute__((warn_unused_result))

497

static const char *safer_gnutls_strerror(int value){

498

const char *ret = gnutls_strerror(value);

473

static const char * safer_gnutls_strerror(int value){

474

const char *ret = gnutls_strerror(value); /* Spurious warning from

475

-Wunreachable-code */

499

476

if(ret == NULL)

500

477

ret = "(unknown)";

501

478

return ret;

502

479

}

503

480

504

481

/* GnuTLS log function callback */

505

__attribute__((nonnull))

506

482

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

507

483

const char* string){

508

484

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

509

485

}

510

486

511

__attribute__((nonnull, warn_unused_result))

512

487

static int init_gnutls_global(const char *pubkeyfilename,

513

const char *seckeyfilename,

514

mandos_context *mc){

488

const char *seckeyfilename){

515

489

int ret;

516

490

517

491

if(debug){

534

508

}

535

509

536

510

/* OpenPGP credentials */

537

ret = gnutls_certificate_allocate_credentials(&mc->cred);

511

ret = gnutls_certificate_allocate_credentials(&mc.cred);

538

512

if(ret != GNUTLS_E_SUCCESS){

539

513

fprintf_plus(stderr, "GnuTLS memory error: %s\n",

540

514

safer_gnutls_strerror(ret));

550

524

}

551

525

552

526

ret = gnutls_certificate_set_openpgp_key_file

553

(mc->cred, pubkeyfilename, seckeyfilename,

527

(mc.cred, pubkeyfilename, seckeyfilename,

554

528

GNUTLS_OPENPGP_FMT_BASE64);

555

529

if(ret != GNUTLS_E_SUCCESS){

556

530

fprintf_plus(stderr,

562

536

}

563

537

564

538

/* GnuTLS server initialization */

565

ret = gnutls_dh_params_init(&mc->dh_params);

539

ret = gnutls_dh_params_init(&mc.dh_params);

566

540

if(ret != GNUTLS_E_SUCCESS){

567

541

fprintf_plus(stderr, "Error in GnuTLS DH parameter"

568

542

" initialization: %s\n",

569

543

safer_gnutls_strerror(ret));

570

544

goto globalfail;

571

545

}

572

ret = gnutls_dh_params_generate2(mc->dh_params, mc->dh_bits);

546

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

573

547

if(ret != GNUTLS_E_SUCCESS){

574

548

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

575

549

safer_gnutls_strerror(ret));

576

550

goto globalfail;

577

551

}

578

552

579

gnutls_certificate_set_dh_params(mc->cred, mc->dh_params);

553

gnutls_certificate_set_dh_params(mc.cred, mc.dh_params);

580

554

581

555

return 0;

582

556

583

557

globalfail:

584

558

585

gnutls_certificate_free_credentials(mc->cred);

559

gnutls_certificate_free_credentials(mc.cred);

586

560

gnutls_global_deinit();

587

gnutls_dh_params_deinit(mc->dh_params);

561

gnutls_dh_params_deinit(mc.dh_params);

588

562

return -1;

589

563

}

590

564

591

__attribute__((nonnull, warn_unused_result))

592

static int init_gnutls_session(gnutls_session_t *session,

593

mandos_context *mc){

565

static int init_gnutls_session(gnutls_session_t *session){

594

566

int ret;

595

567

/* GnuTLS session creation */

596

568

do {

608

580

{

609

581

const char *err;

610

582

do {

611

ret = gnutls_priority_set_direct(*session, mc->priority, &err);

583

ret = gnutls_priority_set_direct(*session, mc.priority, &err);

612

584

if(quit_now){

613

585

gnutls_deinit(*session);

614

586

return -1;

625

597

626

598

do {

627

599

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

628

mc->cred);

600

mc.cred);

629

601

if(quit_now){

630

602

gnutls_deinit(*session);

631

603

return -1;

641

613

/* ignore client certificate if any. */

642

614

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

643

615

644

gnutls_dh_set_prime_bits(*session, mc->dh_bits);

616

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

645

617

646

618

return 0;

647

619

}

651

623

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

652

624

653

625

/* Called when a Mandos server is found */

654

__attribute__((nonnull, warn_unused_result))

655

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

626

static int start_mandos_communication(const char *ip, uint16_t port,

656

627

AvahiIfIndex if_index,

657

int af, mandos_context *mc){

628

int af){

658

629

int ret, tcp_sd = -1;

659

630

ssize_t sret;

660

struct sockaddr_storage to;

631

union {

632

struct sockaddr_in in;

633

struct sockaddr_in6 in6;

634

} to;

661

635

char *buffer = NULL;

662

636

char *decrypted_buffer = NULL;

663

637

size_t buffer_length = 0;

687

661

return -1;

688

662

}

689

663

690

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

691

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

692

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

693

bool match = false;

694

{

695

char *interface = NULL;

696

while((interface=argz_next(mc->interfaces, mc->interfaces_size,

697

interface))){

698

if(if_nametoindex(interface) == (unsigned int)if_index){

699

match = true;

700

break;

701

}

702

}

703

}

704

if(not match){

705

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

706

connect to the server */

707

if(debug){

708

char interface[IF_NAMESIZE];

709

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

710

perror_plus("if_indextoname");

711

} else {

712

fprintf_plus(stderr, "Skipping server on non-used interface"

713

" \"%s\"\n",

714

if_indextoname((unsigned int)if_index,

715

interface));

716

}

717

}

718

return -1;

719

}

720

}

721

722

ret = init_gnutls_session(&session, mc);

664

ret = init_gnutls_session(&session);

723

665

if(ret != 0){

724

666

return -1;

725

667

}

726

668

727

669

if(debug){

728

670

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

729

PRIuMAX "\n", ip, (uintmax_t)port);

671

PRIu16 "\n", ip, port);

730

672

}

731

673

732

674

tcp_sd = socket(pf, SOCK_STREAM, 0);

744

686

745

687

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

746

688

if(af == AF_INET6){

747

((struct sockaddr_in6 *)&to)->sin6_family = (sa_family_t)af;

748

ret = inet_pton(af, ip, &((struct sockaddr_in6 *)&to)->sin6_addr);

689

to.in6.sin6_family = (sa_family_t)af;

690

ret = inet_pton(af, ip, &to.in6.sin6_addr);

749

691

} else { /* IPv4 */

750

((struct sockaddr_in *)&to)->sin_family = (sa_family_t)af;

751

ret = inet_pton(af, ip, &((struct sockaddr_in *)&to)->sin_addr);

692

to.in.sin_family = (sa_family_t)af;

693

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

752

694

}

753

695

if(ret < 0 ){

754

696

int e = errno;

763

705

goto mandos_end;

764

706

}

765

707

if(af == AF_INET6){

766

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

767

if(IN6_IS_ADDR_LINKLOCAL

768

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

708

to.in6.sin6_port = htons(port); /* Spurious warnings from

709

-Wconversion and

710

-Wunreachable-code */

711

712

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

713

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

714

-Wunreachable-code*/

769

715

if(if_index == AVAHI_IF_UNSPEC){

770

716

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

771

717

" incomplete without a network interface\n");

773

719

goto mandos_end;

774

720

}

775

721

/* Set the network interface number as scope */

776

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

722

to.in6.sin6_scope_id = (uint32_t)if_index;

777

723

}

778

724

} else {

779

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

725

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

726

-Wconversion and

727

-Wunreachable-code */

780

728

}

781

729

782

730

if(quit_now){

790

738

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

791

739

perror_plus("if_indextoname");

792

740

} else {

793

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIuMAX

794

"\n", ip, interface, (uintmax_t)port);

741

fprintf_plus(stderr, "Connection to: %s%%%s, port %" PRIu16

742

"\n", ip, interface, port);

795

743

}

796

744

} else {

797

fprintf_plus(stderr, "Connection to: %s, port %" PRIuMAX "\n",

798

ip, (uintmax_t)port);

745

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

746

ip, port);

799

747

}

800

748

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

801

749

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

750

const char *pcret;

802

751

if(af == AF_INET6){

803

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

804

sizeof(struct sockaddr_in6),

805

addrstr, sizeof(addrstr), NULL, 0,

806

NI_NUMERICHOST);

752

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

753

sizeof(addrstr));

807

754

} else {

808

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

809

sizeof(struct sockaddr_in),

810

addrstr, sizeof(addrstr), NULL, 0,

811

NI_NUMERICHOST);

755

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

756

sizeof(addrstr));

812

757

}

813

if(ret == EAI_SYSTEM){

814

perror_plus("getnameinfo");

815

} else if(ret != 0) {

816

fprintf_plus(stderr, "getnameinfo: %s", gai_strerror(ret));

817

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

818

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

758

if(pcret == NULL){

759

perror_plus("inet_ntop");

760

} else {

761

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

762

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

763

}

819

764

}

820

765

}

821

766

825

770

}

826

771

827

772

if(af == AF_INET6){

828

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

829

sizeof(struct sockaddr_in6));

773

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

830

774

} else {

831

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

832

sizeof(struct sockaddr_in));

775

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

833

776

}

834

777

if(ret < 0){

835

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

778

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

836

779

int e = errno;

837

780

perror_plus("connect");

838

781

errno = e;

999

942

if(buffer_length > 0){

1000

943

ssize_t decrypted_buffer_size;

1001

944

decrypted_buffer_size = pgp_packet_decrypt(buffer, buffer_length,

1002

&decrypted_buffer, mc);

945

&decrypted_buffer);

1003

946

if(decrypted_buffer_size >= 0){

1004

947

1005

948

written = 0;

1053

996

return retval;

1054

997

}

1055

998

1056

__attribute__((nonnull))

1057

999

static void resolve_callback(AvahiSServiceResolver *r,

1058

1000

AvahiIfIndex interface,

1059

1001

AvahiProtocol proto,

1067

1009

AVAHI_GCC_UNUSED AvahiStringList *txt,

1068

1010

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1069

1011

flags,

1070

void *mc){

1071

if(r == NULL){

1072

return;

1073

}

1012

AVAHI_GCC_UNUSED void* userdata){

1013

assert(r);

1074

1014

1075

1015

/* Called whenever a service has been resolved successfully or

1076

1016

timed out */

1077

1017

1078

1018

if(quit_now){

1079

avahi_s_service_resolver_free(r);

1080

1019

return;

1081

1020

}

1082

1021

1086

1025

fprintf_plus(stderr, "(Avahi Resolver) Failed to resolve service "

1087

1026

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

1088

1027

domain,

1089

avahi_strerror(avahi_server_errno

1090

(((mandos_context*)mc)->server)));

1028

avahi_strerror(avahi_server_errno(mc.server)));

1091

1029

break;

1092

1030

1093

1031

case AVAHI_RESOLVER_FOUND:

1099

1037

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

1100

1038

host_name, ip, (intmax_t)interface, port);

1101

1039

}

1102

int ret = start_mandos_communication(ip, (in_port_t)port,

1103

interface,

1104

avahi_proto_to_af(proto),

1105

mc);

1040

int ret = start_mandos_communication(ip, port, interface,

1041

avahi_proto_to_af(proto));

1106

1042

if(ret == 0){

1107

avahi_simple_poll_quit(simple_poll);

1043

avahi_simple_poll_quit(mc.simple_poll);

1108

1044

} else {

1109

if(not add_server(ip, (in_port_t)port, interface,

1110

avahi_proto_to_af(proto),

1111

&((mandos_context*)mc)->current_server)){

1045

if(not add_server(ip, port, interface,

1046

avahi_proto_to_af(proto))){

1112

1047

fprintf_plus(stderr, "Failed to add server \"%s\" to server"

1113

1048

" list\n", name);

1114

1049

}

1127

1062

const char *domain,

1128

1063

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1129

1064

flags,

1130

void *mc){

1131

if(b == NULL){

1132

return;

1133

}

1065

AVAHI_GCC_UNUSED void* userdata){

1066

assert(b);

1134

1067

1135

1068

/* Called whenever a new services becomes available on the LAN or

1136

1069

is removed from the LAN */

1144

1077

case AVAHI_BROWSER_FAILURE:

1145

1078

1146

1079

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

1147

avahi_strerror(avahi_server_errno

1148

(((mandos_context*)mc)->server)));

1149

avahi_simple_poll_quit(simple_poll);

1080

avahi_strerror(avahi_server_errno(mc.server)));

1081

avahi_simple_poll_quit(mc.simple_poll);

1150

1082

return;

1151

1083

1152

1084

case AVAHI_BROWSER_NEW:

1155

1087

the callback function is called the Avahi server will free the

1156

1088

resolver for us. */

1157

1089

1158

if(avahi_s_service_resolver_new(((mandos_context*)mc)->server,

1159

interface, protocol, name, type,

1160

domain, protocol, 0,

1161

resolve_callback, mc) == NULL)

1090

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

1091

name, type, domain, protocol, 0,

1092

resolve_callback, NULL) == NULL)

1162

1093

fprintf_plus(stderr, "Avahi: Failed to resolve service '%s':"

1163

1094

" %s\n", name,

1164

avahi_strerror(avahi_server_errno

1165

(((mandos_context*)mc)->server)));

1095

avahi_strerror(avahi_server_errno(mc.server)));

1166

1096

break;

1167

1097

1168

1098

case AVAHI_BROWSER_REMOVE:

1187

1117

signal_received = sig;

1188

1118

int old_errno = errno;

1189

1119

/* set main loop to exit */

1190

if(simple_poll != NULL){

1191

avahi_simple_poll_quit(simple_poll);

1120

if(mc.simple_poll != NULL){

1121

avahi_simple_poll_quit(mc.simple_poll);

1192

1122

}

1193

1123

errno = old_errno;

1194

1124

}

1195

1125

1196

__attribute__((nonnull, warn_unused_result))

1197

1126

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

1198

1127

int ret;

1199

1128

error_t ret_errno;

1218

1147

return true;

1219

1148

}

1220

1149

1221

__attribute__((nonnull, warn_unused_result))

1222

1150

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

1223

1151

1224

1152

/* Reject the loopback device */

1266

1194

* corresponds to an acceptable network device.

1267

1195

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

1268

1196

*/

1269

__attribute__((nonnull, warn_unused_result))

1270

1197

int good_interface(const struct dirent *if_entry){

1271

1198

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

1272

1199

return 0;

1290

1217

/*

1291

1218

* This function determines if a network interface is up.

1292

1219

*/

1293

__attribute__((nonnull, warn_unused_result))

1294

1220

bool interface_is_up(const char *interface){

1295

1221

struct ifreq ifr;

1296

1222

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

1307

1233

/*

1308

1234

* This function determines if a network interface is running

1309

1235

*/

1310

__attribute__((nonnull, warn_unused_result))

1311

1236

bool interface_is_running(const char *interface){

1312

1237

struct ifreq ifr;

1313

1238

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

1321

1246

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

1322

1247

}

1323

1248

1324

__attribute__((nonnull, pure, warn_unused_result))

1325

1249

int notdotentries(const struct dirent *direntry){

1326

1250

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

1327

1251

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

1334

1258

}

1335

1259

1336

1260

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

1337

__attribute__((nonnull, warn_unused_result))

1338

1261

int runnable_hook(const struct dirent *direntry){

1339

1262

int ret;

1340

1263

size_t sret;

1348

1271

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

1349

1272

"abcdefghijklmnopqrstuvwxyz"

1350

1273

"0123456789"

1351

"_.-");

1274

"_-");

1352

1275

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

1353

1276

/* Contains non-allowed characters */

1354

1277

if(debug){

1358

1281

return 0;

1359

1282

}

1360

1283

1361

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

1284

char *fullname = NULL;

1285

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

1286

if(ret < 0){

1287

perror_plus("asprintf");

1288

return 0;

1289

}

1290

1291

ret = stat(fullname, &st);

1362

1292

if(ret == -1){

1363

1293

if(debug){

1364

1294

perror_plus("Could not stat hook");

1388

1318

return 1;

1389

1319

}

1390

1320

1391

__attribute__((nonnull, warn_unused_result))

1392

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval,

1393

mandos_context *mc){

1321

int avahi_loop_with_timeout(AvahiSimplePoll *s, int retry_interval){

1394

1322

int ret;

1395

1323

struct timespec now;

1396

1324

struct timespec waited_time;

1397

1325

intmax_t block_time;

1398

1326

1399

1327

while(true){

1400

if(mc->current_server == NULL){

1401

if(debug){

1328

if(mc.current_server == NULL){

1329

if (debug){

1402

1330

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

1403

1331

" No timeout!\n");

1404

1332

}

1405

1333

ret = avahi_simple_poll_iterate(s, -1);

1406

1334

} else {

1407

if(debug){

1335

if (debug){

1408

1336

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

1409

1337

" it, or wait\n");

1410

1338

}

1417

1345

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

1418

1346

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

1419

1347

waited_time.tv_sec = (now.tv_sec

1420

- mc->current_server->last_seen.tv_sec);

1348

- mc.current_server->last_seen.tv_sec);

1421

1349

waited_time.tv_nsec = (now.tv_nsec

1422

- mc->current_server->last_seen.tv_nsec);

1350

- mc.current_server->last_seen.tv_nsec);

1423

1351

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

1424

1352

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

1425

1353

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

1427

1355

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

1428

1356

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

1429

1357

1430

if(debug){

1358

if (debug){

1431

1359

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

1432

1360

block_time);

1433

1361

}

1434

1362

1435

1363

if(block_time <= 0){

1436

ret = start_mandos_communication(mc->current_server->ip,

1437

mc->current_server->port,

1438

mc->current_server->if_index,

1439

mc->current_server->af, mc);

1364

ret = start_mandos_communication(mc.current_server->ip,

1365

mc.current_server->port,

1366

mc.current_server->if_index,

1367

mc.current_server->af);

1440

1368

if(ret == 0){

1441

avahi_simple_poll_quit(s);

1369

avahi_simple_poll_quit(mc.simple_poll);

1442

1370

return 0;

1443

1371

}

1444

1372

ret = clock_gettime(CLOCK_MONOTONIC,

1445

&mc->current_server->last_seen);

1373

&mc.current_server->last_seen);

1446

1374

if(ret == -1){

1447

1375

perror_plus("clock_gettime");

1448

1376

return -1;

1449

1377

}

1450

mc->current_server = mc->current_server->next;

1378

mc.current_server = mc.current_server->next;

1451

1379

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

1452

1380

servers, but don't block */

1453

1381

}

1455

1383

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

1456

1384

}

1457

1385

if(ret != 0){

1458

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

1386

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

1459

1387

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

1460

1388

}

1461

1389

}

1463

1391

}

1464

1392

1465

1393

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

1466

__attribute__((warn_unused_result))

1467

1394

error_t raise_privileges(void){

1468

1395

error_t old_errno = errno;

1469

1396

error_t ret_errno = 0;

1470

1397

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

1471

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1472

1400

}

1473

1401

errno = old_errno;

1474

1402

return ret_errno;

1475

1403

}

1476

1404

1477

1405

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

1478

__attribute__((warn_unused_result))

1479

1406

error_t raise_privileges_permanently(void){

1480

1407

error_t old_errno = errno;

1481

1408

error_t ret_errno = raise_privileges();

1485

1412

}

1486

1413

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

1487

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1488

1416

}

1489

1417

errno = old_errno;

1490

1418

return ret_errno;

1491

1419

}

1492

1420

1493

1421

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

1494

__attribute__((warn_unused_result))

1495

1422

error_t lower_privileges(void){

1496

1423

error_t old_errno = errno;

1497

1424

error_t ret_errno = 0;

1498

1425

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

1499

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1500

1428

}

1501

1429

errno = old_errno;

1502

1430

return ret_errno;

1503

1431

}

1504

1432

1505

1433

/* Lower privileges permanently */

1506

__attribute__((warn_unused_result))

1507

1434

error_t lower_privileges_permanently(void){

1508

1435

error_t old_errno = errno;

1509

1436

error_t ret_errno = 0;

1510

1437

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

1511

1438

ret_errno = errno;

1439

perror_plus("setuid");

1512

1440

}

1513

1441

errno = old_errno;

1514

1442

return ret_errno;

1515

1443

}

1516

1444

1517

__attribute__((nonnull))

1518

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

1445

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

1519

1446

const float delay){

1520

struct dirent **direntries = NULL;

1521

if(hookdir_fd == -1){

1522

hookdir_fd = open(hookdir, O_RDONLY);

1523

if(hookdir_fd == -1){

1524

if(errno == ENOENT){

1525

if(debug){

1526

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

1527

" found\n", hookdir);

1528

}

1529

} else {

1530

perror_plus("open");

1531

}

1532

return;

1533

}

1534

}

1535

#ifdef __GLIBC__

1536

#if __GLIBC_PREREQ(2, 15)

1537

int numhooks = scandirat(hookdir_fd, ".", &direntries,

1538

runnable_hook, alphasort);

1539

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

1540

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

1541

alphasort);

1542

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

1543

#else /* not __GLIBC__ */

1544

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

1545

alphasort);

1546

#endif /* not __GLIBC__ */

1447

struct dirent **direntries;

1448

struct dirent *direntry;

1449

int ret;

1450

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

1451

alphasort);

1547

1452

if(numhooks == -1){

1548

1453

perror_plus("scandir");

1549

return;

1550

}

1551

struct dirent *direntry;

1552

int ret;

1553

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

1554

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

1555

direntry = direntries[i];

1556

if(debug){

1557

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

1558

direntry->d_name);

1559

}

1560

pid_t hook_pid = fork();

1561

if(hook_pid == 0){

1562

/* Child */

1563

/* Raise privileges */

1564

errno = raise_privileges_permanently();

1565

if(errno != 0){

1566

perror_plus("Failed to raise privileges");

1567

_exit(EX_NOPERM);

1568

}

1569

/* Set group */

1570

errno = 0;

1571

ret = setgid(0);

1572

if(ret == -1){

1573

perror_plus("setgid");

1574

_exit(EX_NOPERM);

1575

}

1576

/* Reset supplementary groups */

1577

errno = 0;

1578

ret = setgroups(0, NULL);

1579

if(ret == -1){

1580

perror_plus("setgroups");

1581

_exit(EX_NOPERM);

1582

}

1583

ret = dup2(devnull, STDIN_FILENO);

1584

if(ret == -1){

1585

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

1586

_exit(EX_OSERR);

1587

}

1588

ret = close(devnull);

1589

if(ret == -1){

1590

perror_plus("close");

1591

_exit(EX_OSERR);

1592

}

1593

ret = dup2(STDERR_FILENO, STDOUT_FILENO);

1594

if(ret == -1){

1595

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

1596

_exit(EX_OSERR);

1597

}

1598

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

1599

if(ret == -1){

1600

perror_plus("setenv");

1601

_exit(EX_OSERR);

1602

}

1603

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

1604

if(ret == -1){

1605

perror_plus("setenv");

1606

_exit(EX_OSERR);

1607

}

1608

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

1609

if(ret == -1){

1610

perror_plus("setenv");

1611

_exit(EX_OSERR);

1612

}

1613

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

1614

if(ret == -1){

1615

perror_plus("setenv");

1616

_exit(EX_OSERR);

1617

}

1618

char *delaystring;

1619

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

1620

if(ret == -1){

1454

} else {

1455

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

1456

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

1457

direntry = direntries[i];

1458

char *fullname = NULL;

1459

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

1460

if(ret < 0){

1621

1461

perror_plus("asprintf");

1622

_exit(EX_OSERR);

1623

}

1624

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

1625

if(ret == -1){

1462

continue;

1463

}

1464

if(debug){

1465

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

1466

direntry->d_name);

1467

}

1468

pid_t hook_pid = fork();

1469

if(hook_pid == 0){

1470

/* Child */

1471

/* Raise privileges */

1472

raise_privileges_permanently();

1473

/* Set group */

1474

errno = 0;

1475

ret = setgid(0);

1476

if(ret == -1){

1477

perror_plus("setgid");

1478

}

1479

/* Reset supplementary groups */

1480

errno = 0;

1481

ret = setgroups(0, NULL);

1482

if(ret == -1){

1483

perror_plus("setgroups");

1484

}

1485

dup2(devnull, STDIN_FILENO);

1486

close(devnull);

1487

dup2(STDERR_FILENO, STDOUT_FILENO);

1488

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

1489

if(ret == -1){

1490

perror_plus("setenv");

1491

_exit(EX_OSERR);

1492

}

1493

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

1494

if(ret == -1){

1495

perror_plus("setenv");

1496

_exit(EX_OSERR);

1497

}

1498

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

1499

if(ret == -1){

1500

perror_plus("setenv");

1501

_exit(EX_OSERR);

1502

}

1503

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

1504

if(ret == -1){

1505

perror_plus("setenv");

1506

_exit(EX_OSERR);

1507

}

1508

char *delaystring;

1509

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

1510

if(ret == -1){

1511

perror_plus("asprintf");

1512

_exit(EX_OSERR);

1513

}

1514

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

1515

if(ret == -1){

1516

free(delaystring);

1517

perror_plus("setenv");

1518

_exit(EX_OSERR);

1519

}

1626

1520

free(delaystring);

1627

perror_plus("setenv");

1628

_exit(EX_OSERR);

1629

}

1630

free(delaystring);

1631

if(connect_to != NULL){

1632

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

1633

if(ret == -1){

1634

perror_plus("setenv");

1635

_exit(EX_OSERR);

1636

}

1637

}

1638

int hook_fd = openat(hookdir_fd, direntry->d_name, O_RDONLY);

1639

if(hook_fd == -1){

1640

perror_plus("openat");

1641

_exit(EXIT_FAILURE);

1642

}

1643

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

1644

perror_plus("close");

1645

_exit(EXIT_FAILURE);

1646

}

1647

if(fexecve(hook_fd, (char *const []){ direntry->d_name, NULL },

1648

environ) == -1){

1649

perror_plus("fexecve");

1650

_exit(EXIT_FAILURE);

1651

}

1652

} else {

1653

int status;

1654

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

1655

perror_plus("waitpid");

1656

free(direntry);

1657

continue;

1658

}

1659

if(WIFEXITED(status)){

1660

if(WEXITSTATUS(status) != 0){

1661

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

1662

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

1663

WEXITSTATUS(status));

1664

free(direntry);

1665

continue;

1666

}

1667

} else if(WIFSIGNALED(status)){

1668

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

1669

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

1670

WTERMSIG(status));

1671

free(direntry);

1672

continue;

1521

if(connect_to != NULL){

1522

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

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

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

1529

perror_plus("execl");

1530

_exit(EXIT_FAILURE);

1531

}

1673

1532

} else {

1674

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

1675

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

1676

free(direntry);

1677

continue;

1678

}

1679

}

1680

if(debug){

1681

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

1682

direntry->d_name);

1683

}

1684

free(direntry);

1685

}

1686

free(direntries);

1687

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

1688

perror_plus("close");

1689

} else {

1690

hookdir_fd = -1;

1691

}

1692

close(devnull);

1533

int status;

1534

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

1535

perror_plus("waitpid");

1536

free(fullname);

1537

continue;

1538

}

1539

if(WIFEXITED(status)){

1540

if(WEXITSTATUS(status) != 0){

1541

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

1542

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

1543

WEXITSTATUS(status));

1544

free(fullname);

1545

continue;

1546

}

1547

} else if(WIFSIGNALED(status)){

1548

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

1549

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

1550

WTERMSIG(status));

1551

free(fullname);

1552

continue;

1553

} else {

1554

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

1555

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

1556

free(fullname);

1557

continue;

1558

}

1559

}

1560

free(fullname);

1561

if(debug){

1562

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

1563

direntry->d_name);

1564

}

1565

}

1566

close(devnull);

1567

}

1568

return true;

1693

1569

}

1694

1570

1695

__attribute__((nonnull, warn_unused_result))

1696

1571

error_t bring_up_interface(const char *const interface,

1697

1572

const float delay){

1573

int sd = -1;

1698

1574

error_t old_errno = errno;

1699

int ret;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1700

1577

struct ifreq network;

1701

1578

unsigned int if_index = if_nametoindex(interface);

1702

1579

if(if_index == 0){

1711

1588

}

1712

1589

1713

1590

if(not interface_is_up(interface)){

1714

error_t ret_errno = 0, ioctl_errno = 0;

1715

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

1591

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

1716

1592

ret_errno = errno;

1717

1593

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

1718

1594

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

1719

errno = old_errno;

1720

1595

return ret_errno;

1721

1596

}

1722

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

1597

network.ifr_flags |= IFF_UP;

1723

1598

1724

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

1725

if(sd == -1){

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1726

1601

ret_errno = errno;

1727

1602

perror_plus("socket");

1728

1603

errno = old_errno;

1729

1604

return ret_errno;

1730

1605

}

1731

1606

1732

1607

if(quit_now){

1733

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

1734

if(ret == -1){

1735

perror_plus("close");

1736

}

1608

close(sd);

1737

1609

errno = old_errno;

1738

1610

return EINTR;

1739

1611

}

1743

1615

interface);

1744

1616

}

1745

1617

1746

/* Raise privileges */

1747

ret_errno = raise_privileges();

1748

if(ret_errno != 0){

1749

errno = ret_errno;

1750

perror_plus("Failed to raise privileges");

1751

}

1618

/* Raise priviliges */

1619

raise_privileges();

1752

1620

1753

1621

#ifdef __linux__

1754

int ret_linux;

1755

bool restore_loglevel = false;

1756

if(ret_errno == 0){

1757

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1758

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

1759

ret_linux = klogctl(8, NULL, 5);

1760

if(ret_linux == -1){

1761

perror_plus("klogctl");

1762

} else {

1763

restore_loglevel = true;

1764

}

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1765

1629

}

1766

1630

#endif /* __linux__ */

1767

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

1768

ioctl_errno = errno;

1631

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

1632

ret_errno = errno;

1769

1633

#ifdef __linux__

1770

1634

if(restore_loglevel){

1771

1635

ret_linux = klogctl(7, NULL, 0);

1775

1639

}

1776

1640

#endif /* __linux__ */

1777

1641

1778

/* If raise_privileges() succeeded above */

1779

if(ret_errno == 0){

1780

/* Lower privileges */

1781

ret_errno = lower_privileges();

1782

if(ret_errno != 0){

1783

errno = ret_errno;

1784

perror_plus("Failed to lower privileges");

1785

}

1786

}

1642

/* Lower privileges */

1643

lower_privileges();

1787

1644

1788

1645

/* Close the socket */

1789

1646

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

1792

1649

}

1793

1650

1794

1651

if(ret_setflags == -1){

1795

errno = ioctl_errno;

1652

errno = ret_errno;

1796

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1797

1654

errno = old_errno;

1798

return ioctl_errno;

1655

return ret_errno;

1799

1656

}

1800

1657

} else if(debug){

1801

1658

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

1819

1676

return 0;

1820

1677

}

1821

1678

1822

__attribute__((nonnull, warn_unused_result))

1823

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1824

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1825

1684

struct ifreq network;

1826

1685

unsigned int if_index = if_nametoindex(interface);

1827

1686

if(if_index == 0){

1830

1689

return ENXIO;

1831

1690

}

1832

1691

if(interface_is_up(interface)){

1833

error_t ret_errno = 0, ioctl_errno = 0;

1834

1692

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

1835

1693

ret_errno = errno;

1836

1694

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

1837

1695

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

1838

errno = old_errno;

1839

1696

return ret_errno;

1840

1697

}

1841

1698

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

1842

1699

1843

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

1844

if(sd == -1){

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1845

1702

ret_errno = errno;

1846

1703

perror_plus("socket");

1847

1704

errno = old_errno;

1853

1710

interface);

1854

1711

}

1855

1712

1856

/* Raise privileges */

1857

ret_errno = raise_privileges();

1858

if(ret_errno != 0){

1859

errno = ret_errno;

1860

perror_plus("Failed to raise privileges");

1861

}

1862

1863

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

1864

ioctl_errno = errno;

1865

1866

/* If raise_privileges() succeeded above */

1867

if(ret_errno == 0){

1868

/* Lower privileges */

1869

ret_errno = lower_privileges();

1870

if(ret_errno != 0){

1871

errno = ret_errno;

1872

perror_plus("Failed to lower privileges");

1873

}

1874

}

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1875

1721

1876

1722

/* Close the socket */

1877

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

1723

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

1878

1724

if(ret == -1){

1879

1725

perror_plus("close");

1880

1726

}

1881

1727

1882

1728

if(ret_setflags == -1){

1883

errno = ioctl_errno;

1729

errno = ret_errno;

1884

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1885

1731

errno = old_errno;

1886

return ioctl_errno;

1732

return ret_errno;

1887

1733

}

1888

1734

} else if(debug){

1889

1735

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

1895

1741

}

1896

1742

1897

1743

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

1898

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

1899

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

1900

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

1901

.interfaces = NULL, .interfaces_size = 0 };

1902

1744

AvahiSServiceBrowser *sb = NULL;

1903

1745

error_t ret_errno;

1904

1746

int ret;

1905

1747

intmax_t tmpmax;

1906

1748

char *tmp;

1907

1749

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1908

1752

char *interfaces_to_take_down = NULL;

1909

1753

size_t interfaces_to_take_down_size = 0;

1910

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

1911

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

1912

char *tempdir = NULL;

1754

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

1755

bool tempdir_created = false;

1913

1756

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1914

1757

const char *seckey = PATHDIR "/" SECKEY;

1915

1758

const char *pubkey = PATHDIR "/" PUBKEY;

1916

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1917

1761

1918

1762

bool gnutls_initialized = false;

1919

1763

bool gpgme_initialized = false;

2010

1854

connect_to = arg;

2011

1855

break;

2012

1856

case 'i': /* --interface */

2013

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

2014

arg, (int)',');

1857

ret_errno = argz_add_sep(&interfaces, &interfaces_size, arg,

1858

(int)',');

2015

1859

if(ret_errno != 0){

2016

1860

argp_error(state, "%s", strerror(ret_errno));

2017

1861

}

2097

1941

/* Work around Debian bug #633582:

2098

1942

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

2099

1943

2100

/* Re-raise privileges */

2101

ret_errno = raise_privileges();

2102

if(ret_errno != 0){

2103

errno = ret_errno;

2104

perror_plus("Failed to raise privileges");

2105

} else {

1944

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

2106

1946

struct stat st;

2107

1947

2108

1948

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

2148

1988

}

2149

1989

2150

1990

/* Lower privileges */

2151

ret_errno = lower_privileges();

2152

if(ret_errno != 0){

2153

errno = ret_errno;

2154

perror_plus("Failed to lower privileges");

1991

errno = 0;

1992

ret = seteuid(uid);

1993

if(ret == -1){

1994

perror_plus("seteuid");

2155

1995

}

2156

1996

}

2157

1997

}

2158

1998

2159

/* Remove invalid interface names (except "none") */

1999

/* Remove empty interface names */

2160

2000

{

2161

2001

char *interface = NULL;

2162

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

2002

while((interface = argz_next(interfaces, interfaces_size,

2163

2003

interface))){

2164

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

2165

and if_nametoindex(interface) == 0){

2166

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

2004

if(if_nametoindex(interface) == 0){

2005

if(interface[0] != '\0' and strcmp(interface, "none") != 0){

2167

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2168

2007

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

2169

2008

}

2170

argz_delete(&mc.interfaces, &mc.interfaces_size, interface);

2009

argz_delete(&interfaces, &interfaces_size, interface);

2171

2010

interface = NULL;

2172

2011

}

2173

2012

}

2175

2014

2176

2015

/* Run network hooks */

2177

2016

{

2178

if(mc.interfaces != NULL){

2179

interfaces_hooks = malloc(mc.interfaces_size);

2180

if(interfaces_hooks == NULL){

2181

perror_plus("malloc");

2182

goto end;

2183

}

2184

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

2185

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

2186

}

2187

run_network_hooks("start", interfaces_hooks != NULL ?

2188

interfaces_hooks : "", delay);

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

if(not run_network_hooks("start", interfaces_hooks, delay)){

2026

goto end;

2027

}

2189

2028

}

2190

2029

2191

2030

if(not debug){

2196

2035

from the signal handler */

2197

2036

/* Initialize the pseudo-RNG for Avahi */

2198

2037

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

2199

simple_poll = avahi_simple_poll_new();

2200

if(simple_poll == NULL){

2038

mc.simple_poll = avahi_simple_poll_new();

2039

if(mc.simple_poll == NULL){

2201

2040

fprintf_plus(stderr,

2202

2041

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

2203

2042

exitcode = EX_UNAVAILABLE;

2268

2107

}

2269

2108

2270

2109

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

2271

if(mc.interfaces == NULL){

2272

struct dirent **direntries = NULL;

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2273

2112

/* Look for any good interfaces */

2274

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2275

2114

alphasort);

2276

2115

if(ret >= 1){

2277

2116

/* Add all found interfaces to interfaces list */

2278

2117

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

2279

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2280

2119

direntries[i]->d_name);

2281

2120

if(ret_errno != 0){

2282

errno = ret_errno;

2283

2121

perror_plus("argz_add");

2284

free(direntries[i]);

2285

2122

continue;

2286

2123

}

2287

2124

if(debug){

2288

2125

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

2289

2126

direntries[i]->d_name);

2290

2127

}

2291

free(direntries[i]);

2292

2128

}

2293

2129

free(direntries);

2294

2130

} else {

2295

if(ret == 0){

2296

free(direntries);

2297

}

2131

free(direntries);

2298

2132

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

2299

2133

exitcode = EXIT_FAILURE;

2300

2134

goto end;

2301

2135

}

2302

2136

}

2303

2137

2304

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

2305

{

2138

/* If we only got one interface, explicitly use only that one */

2139

if(argz_count(interfaces, interfaces_size) == 1){

2140

if(debug){

2141

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

if(not (argz_count(interfaces, interfaces_size) == 1

2149

and strcmp(interfaces, "none") == 0)){

2306

2150

char *interface = NULL;

2307

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

2151

while((interface = argz_next(interfaces, interfaces_size,

2308

2152

interface))){

2309

/* If interface name is "none", stop bringing up interfaces.

2310

Also remove all instances of "none" from the list */

2311

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

2312

argz_delete(&mc.interfaces, &mc.interfaces_size,

2313

interface);

2314

interface = NULL;

2315

while((interface = argz_next(mc.interfaces,

2316

mc.interfaces_size, interface))){

2317

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

2318

argz_delete(&mc.interfaces, &mc.interfaces_size,

2319

interface);

2320

interface = NULL;

2321

}

2322

}

2323

break;

2324

}

2325

2153

bool interface_was_up = interface_is_up(interface);

2326

errno = bring_up_interface(interface, delay);

2154

ret = bring_up_interface(interface, delay);

2327

2155

if(not interface_was_up){

2328

if(errno != 0){

2156

if(ret != 0){

2157

errno = ret;

2329

2158

perror_plus("Failed to bring up interface");

2330

2159

} else {

2331

errno = argz_add(&interfaces_to_take_down,

2332

&interfaces_to_take_down_size,

2333

interface);

2334

if(errno != 0){

2335

perror_plus("argz_add");

2336

}

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2337

2163

}

2338

2164

}

2339

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2340

2169

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

2341

2170

fprintf_plus(stderr, "No interfaces were brought up\n");

2342

2171

}

2343

2172

}

2344

2173

2345

/* If we only got one interface, explicitly use only that one */

2346

if(argz_count(mc.interfaces, mc.interfaces_size) == 1){

2347

if(debug){

2348

fprintf_plus(stderr, "Using only interface \"%s\"\n",

2349

mc.interfaces);

2350

}

2351

if_index = (AvahiIfIndex)if_nametoindex(mc.interfaces);

2352

}

2353

2354

2174

if(quit_now){

2355

2175

goto end;

2356

2176

}

2357

2177

2358

ret = init_gnutls_global(pubkey, seckey, &mc);

2178

ret = init_gnutls_global(pubkey, seckey);

2359

2179

if(ret == -1){

2360

2180

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

2361

2181

exitcode = EX_UNAVAILABLE;

2368

2188

goto end;

2369

2189

}

2370

2190

2371

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

2372

tempdir = mkdtemp(run_tempdir);

2373

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

2374

if(debug){

2375

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

2376

run_tempdir, old_tempdir);

2377

}

2378

tempdir = mkdtemp(old_tempdir);

2379

}

2380

if(tempdir == NULL){

2191

if(mkdtemp(tempdir) == NULL){

2381

2192

perror_plus("mkdtemp");

2382

2193

goto end;

2383

2194

}

2195

tempdir_created = true;

2384

2196

2385

2197

if(quit_now){

2386

2198

goto end;

2387

2199

}

2388

2200

2389

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

2201

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

2390

2202

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

2391

2203

exitcode = EX_UNAVAILABLE;

2392

2204

goto end;

2413

2225

goto end;

2414

2226

}

2415

2227

2416

in_port_t port;

2228

uint16_t port;

2417

2229

errno = 0;

2418

2230

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

2419

2231

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

2420

or tmpmax != (in_port_t)tmpmax){

2232

or tmpmax != (uint16_t)tmpmax){

2421

2233

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

2422

2234

exitcode = EX_USAGE;

2423

2235

goto end;

2424

2236

}

2425

2237

2426

2238

if(quit_now){

2427

2239

goto end;

2428

2240

}

2429

2241

2430

port = (in_port_t)tmpmax;

2242

port = (uint16_t)tmpmax;

2431

2243

*address = '\0';

2432

2244

/* Colon in address indicates IPv6 */

2433

2245

int af;

2449

2261

}

2450

2262

2451

2263

while(not quit_now){

2452

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

2453

&mc);

2264

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

2454

2265

if(quit_now or ret == 0){

2455

2266

break;

2456

2267

}

2458

2269

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

2459

2270

(int)retry_interval);

2460

2271

}

2461

sleep((unsigned int)retry_interval);

2272

sleep((int)retry_interval);

2462

2273

}

2463

2274

2464

if(not quit_now){

2275

if (not quit_now){

2465

2276

exitcode = EXIT_SUCCESS;

2466

2277

}

2467

2278

2482

2293

config.publish_domain = 0;

2483

2294

2484

2295

/* Allocate a new server */

2485

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2486

&config, NULL, NULL, &ret_errno);

2296

mc.server = avahi_server_new(avahi_simple_poll_get

2297

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2487

2299

2488

2300

/* Free the Avahi configuration data */

2489

2301

avahi_server_config_free(&config);

2504

2316

/* Create the Avahi service browser */

2505

2317

sb = avahi_s_service_browser_new(mc.server, if_index,

2506

2318

AVAHI_PROTO_UNSPEC, "_mandos._tcp",

2507

NULL, 0, browse_callback,

2508

(void *)&mc);

2319

NULL, 0, browse_callback, NULL);

2509

2320

if(sb == NULL){

2510

2321

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

2511

2322

avahi_strerror(avahi_server_errno(mc.server)));

2522

2333

if(debug){

2523

2334

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

2524

2335

}

2525

2526

ret = avahi_loop_with_timeout(simple_poll,

2527

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

2336

2337

ret = avahi_loop_with_timeout(mc.simple_poll,

2338

(int)(retry_interval * 1000));

2528

2339

if(debug){

2529

2340

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

2530

2341

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

2537

2348

}

2538

2349

2539

2350

/* Cleanup things */

2540

free(mc.interfaces);

2541

2542

2351

if(sb != NULL)

2543

2352

avahi_s_service_browser_free(sb);

2544

2353

2545

2354

if(mc.server != NULL)

2546

2355

avahi_server_free(mc.server);

2547

2356

2548

if(simple_poll != NULL)

2549

avahi_simple_poll_free(simple_poll);

2357

if(mc.simple_poll != NULL)

2358

avahi_simple_poll_free(mc.simple_poll);

2550

2359

2551

2360

if(gnutls_initialized){

2552

2361

gnutls_certificate_free_credentials(mc.cred);

2564

2373

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

2565

2374

while(mc.current_server != NULL){

2566

2375

server *next = mc.current_server->next;

2567

#ifdef __GNUC__

2568

#pragma GCC diagnostic push

2569

#pragma GCC diagnostic ignored "-Wcast-qual"

2570

#endif

2571

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

2572

#ifdef __GNUC__

2573

#pragma GCC diagnostic pop

2574

#endif

2575

2376

free(mc.current_server);

2576

2377

mc.current_server = next;

2577

2378

}

2578

2379

}

2579

2380

2580

/* Re-raise privileges */

2381

/* Re-raise priviliges */

2581

2382

{

2582

ret_errno = raise_privileges();

2583

if(ret_errno != 0){

2584

errno = ret_errno;

2585

perror_plus("Failed to raise privileges");

2586

} else {

2587

2588

/* Run network hooks */

2589

run_network_hooks("stop", interfaces_hooks != NULL ?

2590

interfaces_hooks : "", delay);

2591

2592

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

2593

{

2594

char *interface = NULL;

2595

while((interface=argz_next(interfaces_to_take_down,

2596

interfaces_to_take_down_size,

2597

interface))){

2598

ret_errno = take_down_interface(interface);

2599

if(ret_errno != 0){

2600

errno = ret_errno;

2601

perror_plus("Failed to take down interface");

2602

}

2603

}

2604

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

2605

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

2606

" down\n");

2607

}

2608

}

2609

}

2610

2611

ret_errno = lower_privileges_permanently();

2612

if(ret_errno != 0){

2613

errno = ret_errno;

2614

perror_plus("Failed to lower privileges permanently");

2615

}

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2398

}

2399

}

2400

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

2401

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

2402

" down\n");

2403

}

2404

}

2405

2406

lower_privileges_permanently();

2616

2407

}

2617

2408

2618

2409

free(interfaces_to_take_down);

2619

2410

free(interfaces_hooks);

2620

2411

2621

2412

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

2622

if(tempdir != NULL){

2413

if(tempdir_created){

2623

2414

struct dirent **direntries = NULL;

2624

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

2625

O_NOFOLLOW));

2626

if(tempdir_fd == -1){

2627

perror_plus("open");

2628

} else {

2629

#ifdef __GLIBC__

2630

#if __GLIBC_PREREQ(2, 15)

2631

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

2632

notdotentries, alphasort);

2633

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

2634

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

2635

alphasort);

2636

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

2637

#else /* not __GLIBC__ */

2638

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

2639

alphasort);

2640

#endif /* not __GLIBC__ */

2641

if(numentries >= 0){

2642

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

2643

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

2644

if(ret == -1){

2645

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

2646

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

2647

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

2648

}

2649

free(direntries[i]);

2650

}

2651

2652

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

2653

free(direntries);

2654

if(numentries == -1){

2655

perror_plus("scandir");

2656

}

2657

ret = rmdir(tempdir);

2658

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

2659

perror_plus("rmdir");

2660

}

2415

struct dirent *direntry = NULL;

2416

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

2417

alphasort);

2418

if (numentries > 0){

2419

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

2420

direntry = direntries[i];

2421

char *fullname = NULL;

2422

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

2423

direntry->d_name);

2424

if(ret < 0){

2425

perror_plus("asprintf");

2426

continue;

2427

}

2428

ret = remove(fullname);

2429

if(ret == -1){

2430

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

2431

strerror(errno));

2432

}

2433

free(fullname);

2661

2434

}

2662

TEMP_FAILURE_RETRY(close(tempdir_fd));

2435

}

2436

2437

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

2438

free(direntries);

2439

if (numentries == -1){

2440

perror_plus("scandir");

2441

}

2442

ret = rmdir(tempdir);

2443

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

2444

perror_plus("rmdir");

2663

2445

}

2664

2446

}

2665

2447