/mandos/trunk : revision 354

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() */

47

srand(), strtof() */

48

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

49

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

50

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

71

INET_ADDRSTRLEN, INET6_ADDRSTRLEN

72

*/

73

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

74

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

75

setgid(), pause() */

74

getuid(), getgid(), setuid(),

75

setgid() */

76

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

77

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

78

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

125

static const char mandos_protocol_version[] = "1";

126

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

127

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

128

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

129

char *connect_to = NULL;

130

128

131

129

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

132

130

typedef struct {

144

142

.dh_bits = 1024, .priority = "SECURE256"

145

143

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

146

144

147

sig_atomic_t quit_now = 0;

148

int signal_received = 0;

149

150

145

/*

151

146

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

152

147

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

169

164

*/

170

165

static bool init_gpgme(const char *seckey,

171

166

const char *pubkey, const char *tempdir){

167

int ret;

172

168

gpgme_error_t rc;

173

169

gpgme_engine_info_t engine_info;

174

170

177

173

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

178

174

*/

179

175

bool import_key(const char *filename){

180

int ret;

181

176

int fd;

182

177

gpgme_data_t pgp_data;

183

178

254

249

return false;

255

250

}

256

251

257

return true;

252

return true;

258

253

}

259

254

260

255

/*

479

474

static int init_gnutls_session(gnutls_session_t *session){

480

475

int ret;

481

476

/* GnuTLS session creation */

482

do {

483

ret = gnutls_init(session, GNUTLS_SERVER);

484

if(quit_now){

485

return -1;

486

}

487

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

477

ret = gnutls_init(session, GNUTLS_SERVER);

488

478

if(ret != GNUTLS_E_SUCCESS){

489

479

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

490

480

safer_gnutls_strerror(ret));

492

482

493

483

{

494

484

const char *err;

495

do {

496

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

497

if(quit_now){

498

gnutls_deinit(*session);

499

return -1;

500

}

501

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

485

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

502

486

if(ret != GNUTLS_E_SUCCESS){

503

487

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

504

488

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

508

492

}

509

493

}

510

494

511

do {

512

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

513

mc.cred);

514

if(quit_now){

515

gnutls_deinit(*session);

516

return -1;

517

}

518

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

495

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

496

mc.cred);

519

497

if(ret != GNUTLS_E_SUCCESS){

520

498

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

521

499

safer_gnutls_strerror(ret));

524

502

}

525

503

526

504

/* ignore client certificate if any. */

527

gnutls_certificate_server_set_request(*session, GNUTLS_CERT_IGNORE);

505

gnutls_certificate_server_set_request(*session,

506

GNUTLS_CERT_IGNORE);

528

507

529

508

gnutls_dh_set_prime_bits(*session, mc.dh_bits);

530

509

535

514

static void empty_log(__attribute__((unused)) AvahiLogLevel level,

536

515

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

537

516

517

sig_atomic_t quit_now = 0;

518

int signal_received = 0;

519

538

520

/* Called when a Mandos server is found */

539

521

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

540

522

AvahiIfIndex if_index,

541

523

int af){

542

int ret, tcp_sd = -1;

524

int ret, tcp_sd;

543

525

ssize_t sret;

544

526

union {

545

527

struct sockaddr_in in;

546

528

struct sockaddr_in6 in6;

547

529

} to;

548

530

char *buffer = NULL;

549

char *decrypted_buffer = NULL;

531

char *decrypted_buffer;

550

532

size_t buffer_length = 0;

551

533

size_t buffer_capacity = 0;

534

ssize_t decrypted_buffer_size;

552

535

size_t written;

553

int retval = -1;

536

int retval = 0;

554

537

gnutls_session_t session;

555

538

int pf; /* Protocol family */

556

539

557

if(quit_now){

558

return -1;

559

}

560

561

540

switch(af){

562

541

case AF_INET6:

563

542

pf = PF_INET6;

583

562

tcp_sd = socket(pf, SOCK_STREAM, 0);

584

563

if(tcp_sd < 0){

585

564

perror("socket");

586

goto mandos_end;

587

}

588

589

if(quit_now){

590

goto mandos_end;

565

return -1;

591

566

}

592

567

593

568

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

600

575

}

601

576

if(ret < 0 ){

602

577

perror("inet_pton");

603

goto mandos_end;

578

return -1;

604

579

}

605

580

if(ret == 0){

606

581

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

607

goto mandos_end;

582

return -1;

608

583

}

609

584

if(af == AF_INET6){

610

585

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

617

592

if(if_index == AVAHI_IF_UNSPEC){

618

593

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

619

594

" without a network interface\n");

620

goto mandos_end;

595

return -1;

621

596

}

622

597

/* Set the network interface number as scope */

623

598

to.in6.sin6_scope_id = (uint32_t)if_index;

628

603

-Wunreachable-code */

629

604

}

630

605

631

if(quit_now){

632

goto mandos_end;

633

}

634

635

606

if(debug){

636

607

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

637

608

char interface[IF_NAMESIZE];

664

635

}

665

636

}

666

637

667

if(quit_now){

668

goto mandos_end;

669

}

670

671

638

if(af == AF_INET6){

672

639

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

673

640

} else {

675

642

}

676

643

if(ret < 0){

677

644

perror("connect");

678

goto mandos_end;

679

}

680

681

if(quit_now){

682

goto mandos_end;

645

return -1;

683

646

}

684

647

685

648

const char *out = mandos_protocol_version;

690

653

out_size - written));

691

654

if(ret == -1){

692

655

perror("write");

656

retval = -1;

693

657

goto mandos_end;

694

658

}

695

659

written += (size_t)ret;

703

667

break;

704

668

}

705

669

}

706

707

if(quit_now){

708

goto mandos_end;

709

}

710

670

}

711

671

712

672

if(debug){

713

673

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

714

674

}

715

675

716

if(quit_now){

717

goto mandos_end;

718

}

719

720

676

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

721

677

722

if(quit_now){

723

goto mandos_end;

724

}

725

726

do {

678

do{

727

679

ret = gnutls_handshake(session);

728

if(quit_now){

729

goto mandos_end;

730

}

731

680

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

732

681

733

682

if(ret != GNUTLS_E_SUCCESS){

735

684

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

736

685

gnutls_perror(ret);

737

686

}

687

retval = -1;

738

688

goto mandos_end;

739

689

}

740

690

746

696

}

747

697

748

698

while(true){

749

750

if(quit_now){

751

goto mandos_end;

752

}

753

754

699

buffer_capacity = incbuffer(&buffer, buffer_length,

755

700

buffer_capacity);

756

701

if(buffer_capacity == 0){

757

702

perror("incbuffer");

758

goto mandos_end;

759

}

760

761

if(quit_now){

703

retval = -1;

762

704

goto mandos_end;

763

705

}

764

706

773

715

case GNUTLS_E_AGAIN:

774

716

break;

775

717

case GNUTLS_E_REHANDSHAKE:

776

do {

718

do{

777

719

ret = gnutls_handshake(session);

778

779

if(quit_now){

780

goto mandos_end;

781

}

782

720

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

783

721

if(ret < 0){

784

722

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

785

723

gnutls_perror(ret);

724

retval = -1;

786

725

goto mandos_end;

787

726

}

788

727

break;

789

728

default:

790

729

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

791

730

" encrypted session with Mandos server\n");

731

retval = -1;

792

732

gnutls_bye(session, GNUTLS_SHUT_RDWR);

793

733

goto mandos_end;

794

734

}

801

741

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

802

742

}

803

743

804

if(quit_now){

805

goto mandos_end;

806

}

807

808

do {

809

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

810

if(quit_now){

811

goto mandos_end;

812

}

813

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

744

gnutls_bye(session, GNUTLS_SHUT_RDWR);

814

745

815

746

if(buffer_length > 0){

816

ssize_t decrypted_buffer_size;

817

747

decrypted_buffer_size = pgp_packet_decrypt(buffer,

818

748

buffer_length,

819

749

&decrypted_buffer);

820

750

if(decrypted_buffer_size >= 0){

821

822

751

written = 0;

823

752

while(written < (size_t) decrypted_buffer_size){

824

if(quit_now){

825

goto mandos_end;

826

}

827

828

753

ret = (int)fwrite(decrypted_buffer + written, 1,

829

754

(size_t)decrypted_buffer_size - written,

830

755

stdout);

833

758

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

834

759

strerror(errno));

835

760

}

836

goto mandos_end;

761

retval = -1;

762

break;

837

763

}

838

764

written += (size_t)ret;

839

765

}

840

retval = 0;

766

free(decrypted_buffer);

767

} else {

768

retval = -1;

841

769

}

770

} else {

771

retval = -1;

842

772

}

843

773

844

774

/* Shutdown procedure */

845

775

846

776

mandos_end:

847

free(decrypted_buffer);

848

777

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

778

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

852

779

if(ret == -1){

853

780

perror("close");

854

781

}

855

782

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

858

}

859

783

return retval;

860

784

}

861

785

924

848

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

925

849

is removed from the LAN */

926

850

927

if(quit_now){

928

return;

929

}

930

931

851

switch(event){

932

852

default:

933

853

case AVAHI_BROWSER_FAILURE:

976

896

errno = old_errno;

977

897

}

978

898

979

/*

980

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

981

* corresponds to an acceptable network device.

982

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

983

*/

984

int good_interface(const struct dirent *if_entry){

985

ssize_t ssret;

986

char *flagname = NULL;

987

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

988

if_entry->d_name);

989

if(ret < 0){

990

perror("asprintf");

991

return 0;

992

}

993

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

994

return 0;

995

}

996

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

997

if(flags_fd == -1){

998

perror("open");

999

return 0;

1000

}

1001

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

1002

/* read line from flags_fd */

1003

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

1004

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

1005

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

1006

if(flagstring == NULL){

1007

perror("malloc");

1008

close(flags_fd);

1009

return 0;

1010

}

1011

while(to_read > 0){

1012

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

1013

(size_t)to_read));

1014

if(ssret == -1){

1015

perror("read");

1016

free(flagstring);

1017

close(flags_fd);

1018

return 0;

1019

}

1020

to_read -= ssret;

1021

if(ssret == 0){

1022

break;

1023

}

1024

}

1025

close(flags_fd);

1026

intmax_t tmpmax;

1027

char *tmp;

1028

errno = 0;

1029

tmpmax = strtoimax(flagstring, &tmp, 0);

1030

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

1031

and not (isspace(*tmp)))

1032

or tmpmax != (ifreq_flags)tmpmax){

1033

if(debug){

1034

fprintf(stderr, "Invalid flags \"%s\" for interface \"%s\"\n",

1035

flagstring, if_entry->d_name);

1036

}

1037

free(flagstring);

1038

return 0;

1039

}

1040

free(flagstring);

1041

ifreq_flags flags = (ifreq_flags)tmpmax;

1042

/* Reject the loopback device */

1043

if(flags & IFF_LOOPBACK){

1044

if(debug){

1045

fprintf(stderr, "Rejecting loopback interface \"%s\"\n",

1046

if_entry->d_name);

1047

}

1048

return 0;

1049

}

1050

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

1051

if(connect_to != NULL and (flags & IFF_POINTOPOINT)){

1052

if(debug){

1053

fprintf(stderr, "Accepting point-to-point interface \"%s\"\n",

1054

if_entry->d_name);

1055

}

1056

return 1;

1057

}

1058

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

1059

if(not (flags & IFF_BROADCAST)){

1060

if(debug){

1061

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

1062

if_entry->d_name);

1063

}

1064

return 0;

1065

}

1066

/* Accept this device */

1067

if(debug){

1068

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

1069

if_entry->d_name);

1070

}

1071

return 1;

1072

}

1073

1074

899

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

1075

900

AvahiSServiceBrowser *sb = NULL;

1076

901

int error;

1078

903

intmax_t tmpmax;

1079

904

char *tmp;

1080

905

int exitcode = EXIT_SUCCESS;

1081

const char *interface = "";

906

const char *interface = "eth0";

1082

907

struct ifreq network;

1083

908

int sd = -1;

1084

909

bool take_down_interface = false;

1085

910

uid_t uid;

1086

911

gid_t gid;

912

char *connect_to = NULL;

1087

913

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

1088

914

bool tempdir_created = false;

1089

915

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1094

920

bool gpgme_initialized = false;

1095

921

float delay = 2.5f;

1096

922

1097

struct sigaction old_sigterm_action = { .sa_handler = SIG_DFL };

923

struct sigaction old_sigterm_action;

1098

924

struct sigaction sigterm_action = { .sa_handler = handle_sigterm };

1099

925

1100

uid = getuid();

1101

gid = getgid();

1102

1103

/* Lower any group privileges we might have, just to be safe */

1104

errno = 0;

1105

ret = setgid(gid);

1106

if(ret == -1){

1107

perror("setgid");

1108

}

1109

1110

/* Lower user privileges (temporarily) */

1111

errno = 0;

1112

ret = seteuid(uid);

1113

if(ret == -1){

1114

perror("seteuid");

1115

}

1116

1117

if(quit_now){

1118

goto end;

1119

}

1120

1121

926

{

1122

927

struct argp_option options[] = {

1123

928

{ .name = "debug", .key = 128,

1219

1024

if(not debug){

1220

1025

avahi_set_log_function(empty_log);

1221

1026

}

1222

1223

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

1224

struct dirent **direntries;

1225

ret = scandir(sys_class_net, &direntries, good_interface,

1226

alphasort);

1227

if(ret >= 1){

1228

/* Pick the first good interface */

1229

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

1230

if(debug){

1231

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

1232

}

1233

if(interface == NULL){

1234

perror("malloc");

1235

free(direntries);

1236

exitcode = EXIT_FAILURE;

1237

goto end;

1238

}

1239

free(direntries);

1240

} else {

1241

free(direntries);

1242

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

1243

exitcode = EXIT_FAILURE;

1244

goto end;

1245

}

1246

}

1247

1027

1248

1028

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

1249

1029

from the signal handler */

1275

1055

exitcode = EXIT_FAILURE;

1276

1056

goto end;

1277

1057

}

1278

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

1279

| [[info:libc:Initial Signal Actions]] |

1280

| [[info:libc:Basic Signal Handling]] |

1281

*/

1282

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

1283

if(ret == -1){

1284

perror("sigaction");

1285

return EXIT_FAILURE;

1286

}

1287

if(old_sigterm_action.sa_handler != SIG_IGN){

1288

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

1289

if(ret == -1){

1290

perror("sigaction");

1291

exitcode = EXIT_FAILURE;

1292

goto end;

1293

}

1294

}

1295

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

1296

if(ret == -1){

1297

perror("sigaction");

1298

return EXIT_FAILURE;

1299

}

1300

if(old_sigterm_action.sa_handler != SIG_IGN){

1301

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

1302

if(ret == -1){

1303

perror("sigaction");

1304

exitcode = EXIT_FAILURE;

1305

goto end;

1306

}

1307

}

1308

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

1309

if(ret == -1){

1310

perror("sigaction");

1311

return EXIT_FAILURE;

1312

}

1313

if(old_sigterm_action.sa_handler != SIG_IGN){

1314

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

1315

if(ret == -1){

1316

perror("sigaction");

1317

exitcode = EXIT_FAILURE;

1318

goto end;

1319

}

1058

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

1059

if(ret == -1){

1060

perror("sigaction");

1061

exitcode = EXIT_FAILURE;

1062

goto end;

1063

}

1064

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

1065

if(ret == -1){

1066

perror("sigaction");

1067

exitcode = EXIT_FAILURE;

1068

goto end;

1069

}

1070

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

1071

if(ret == -1){

1072

perror("sigaction");

1073

exitcode = EXIT_FAILURE;

1074

goto end;

1320

1075

}

1321

1076

1322

1077

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

1323

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

1078

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

1324

1079

if_index = (AvahiIfIndex) if_nametoindex(interface);

1325

1080

if(if_index == 0){

1326

1081

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

1332

1087

goto end;

1333

1088

}

1334

1089

1335

/* Re-raise priviliges */

1336

errno = 0;

1337

ret = seteuid(0);

1338

if(ret == -1){

1339

perror("seteuid");

1340

}

1341

1342

1090

#ifdef __linux__

1343

1091

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1344

1092

messages to mess up the prompt */

1362

1110

}

1363

1111

}

1364

1112

#endif /* __linux__ */

1365

/* Lower privileges */

1366

errno = 0;

1367

ret = seteuid(uid);

1368

if(ret == -1){

1369

perror("seteuid");

1370

}

1371

1113

goto end;

1372

1114

}

1373

1115

strcpy(network.ifr_name, interface);

1383

1125

}

1384

1126

#endif /* __linux__ */

1385

1127

exitcode = EXIT_FAILURE;

1386

/* Lower privileges */

1387

errno = 0;

1388

ret = seteuid(uid);

1389

if(ret == -1){

1390

perror("seteuid");

1391

}

1392

1128

goto end;

1393

1129

}

1394

1130

if((network.ifr_flags & IFF_UP) == 0){

1397

1133

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

1398

1134

if(ret == -1){

1399

1135

take_down_interface = false;

1400

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1136

perror("ioctl SIOCSIFFLAGS");

1401

1137

exitcode = EXIT_FAILURE;

1402

1138

#ifdef __linux__

1403

1139

if(restore_loglevel){

1407

1143

}

1408

1144

}

1409

1145

#endif /* __linux__ */

1410

/* Lower privileges */

1411

errno = 0;

1412

ret = seteuid(uid);

1413

if(ret == -1){

1414

perror("seteuid");

1415

}

1416

1146

goto end;

1417

1147

}

1418

1148

}

1446

1176

}

1447

1177

}

1448

1178

#endif /* __linux__ */

1449

/* Lower privileges */

1450

errno = 0;

1451

if(take_down_interface){

1452

/* Lower privileges */

1453

ret = seteuid(uid);

1454

if(ret == -1){

1455

perror("seteuid");

1456

}

1457

} else {

1458

/* Lower privileges permanently */

1459

ret = setuid(uid);

1460

if(ret == -1){

1461

perror("setuid");

1462

}

1463

}

1179

}

1180

1181

if(quit_now){

1182

goto end;

1183

}

1184

1185

uid = getuid();

1186

gid = getgid();

1187

1188

errno = 0;

1189

setgid(gid);

1190

if(ret == -1){

1191

perror("setgid");

1192

}

1193

1194

ret = setuid(uid);

1195

if(ret == -1){

1196

perror("setuid");

1464

1197

}

1465

1198

1466

1199

if(quit_now){

1640

1373

1641

1374

/* Take down the network interface */

1642

1375

if(take_down_interface){

1643

/* Re-raise priviliges */

1644

errno = 0;

1645

ret = seteuid(0);

1376

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

1646

1377

if(ret == -1){

1647

perror("seteuid");

1378

perror("ioctl SIOCGIFFLAGS");

1379

} else if(network.ifr_flags & IFF_UP) {

1380

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

1381

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

1382

if(ret == -1){

1383

perror("ioctl SIOCSIFFLAGS");

1384

}

1648

1385

}

1649

if(geteuid() == 0){

1650

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

1651

if(ret == -1){

1652

perror("ioctl SIOCGIFFLAGS");

1653

} else if(network.ifr_flags & IFF_UP) {

1654

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

1655

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

1656

if(ret == -1){

1657

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1658

}

1659

}

1660

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

1661

if(ret == -1){

1662

perror("close");

1663

}

1664

/* Lower privileges permanently */

1665

errno = 0;

1666

ret = setuid(uid);

1667

if(ret == -1){

1668

perror("setuid");

1669

}

1386

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

1387

if(ret == -1){

1388

perror("close");

1670

1389

}

1671

1390

}

1672

1391

1715

1434

}

1716

1435

1717

1436

if(quit_now){

1718

sigemptyset(&old_sigterm_action.sa_mask);

1719

old_sigterm_action.sa_handler = SIG_DFL;

1720

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1721

&old_sigterm_action,

1722

NULL));

1437

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

1723

1438

if(ret == -1){

1724

1439

perror("sigaction");

1725

1440

}

1726

do {

1727

ret = raise(signal_received);

1728

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

1729

if(ret != 0){

1730

perror("raise");

1731

abort();

1732

}

1733

TEMP_FAILURE_RETRY(pause());

1441

raise(signal_received);

1734

1442

}

1735

1443

1736

1444

return exitcode;