/mandos/trunk : revision 370

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, srand(),

47

strtof(), abort() */

46

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

47

srand(), strtof() */

48

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

49

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

50

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

63

strtoimax() */

64

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

65

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

66

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

66

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

67

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

68

SIOCSIFFLAGS, if_indextoname(),

69

if_nametoindex(), IF_NAMESIZE */

72

*/

73

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

74

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

75

setgid(), pause() */

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

82

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

83

sigaction(), SIGTERM, sig_atomic_t,

84

raise() */

85

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

86

EX_NOHOST, EX_IOERR, EX_PROTOCOL */

87

85

88

86

#ifdef __linux__

89

87

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

127

125

static const char mandos_protocol_version[] = "1";

128

126

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

129

127

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

130

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

131

char *connect_to = NULL;

132

128

133

129

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

134

130

typedef struct {

146

142

.dh_bits = 1024, .priority = "SECURE256"

147

143

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

148

144

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

152

145

/*

153

146

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

154

147

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

483

476

/* GnuTLS session creation */

484

477

do {

485

478

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

489

479

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

490

480

if(ret != GNUTLS_E_SUCCESS){

491

481

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

496

486

const char *err;

497

487

do {

498

488

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

503

489

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

504

490

if(ret != GNUTLS_E_SUCCESS){

505

491

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

513

499

do {

514

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

515

501

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

520

502

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

521

503

if(ret != GNUTLS_E_SUCCESS){

522

504

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

537

519

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

538

520

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

539

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

540

525

/* Called when a Mandos server is found */

541

526

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

542

527

AvahiIfIndex if_index,

548

533

struct sockaddr_in6 in6;

549

534

} to;

550

535

char *buffer = NULL;

551

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

552

537

size_t buffer_length = 0;

553

538

size_t buffer_capacity = 0;

554

539

size_t written;

555

int retval = -1;

540

int retval = 0;

556

541

gnutls_session_t session;

557

542

int pf; /* Protocol family */

558

543

559

errno = 0;

560

561

544

if(quit_now){

562

errno = EINTR;

563

545

return -1;

564

546

}

565

547

572

554

break;

573

555

default:

574

556

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

575

errno = EINVAL;

576

557

return -1;

577

558

}

578

559

588

569

589

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

590

571

if(tcp_sd < 0){

591

int e = errno;

592

572

perror("socket");

593

errno = e;

573

retval = -1;

594

574

goto mandos_end;

595

575

}

596

576

597

577

if(quit_now){

598

errno = EINTR;

599

578

goto mandos_end;

600

579

}

601

580

608

587

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

609

588

}

610

589

if(ret < 0 ){

611

int e = errno;

612

590

perror("inet_pton");

613

errno = e;

591

retval = -1;

614

592

goto mandos_end;

615

593

}

616

594

if(ret == 0){

617

int e = errno;

618

595

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

619

errno = e;

596

retval = -1;

620

597

goto mandos_end;

621

598

}

622

599

if(af == AF_INET6){

630

607

if(if_index == AVAHI_IF_UNSPEC){

631

608

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

632

609

" without a network interface\n");

633

errno = EINVAL;

610

retval = -1;

634

611

goto mandos_end;

635

612

}

636

613

/* Set the network interface number as scope */

643

620

}

644

621

645

622

if(quit_now){

646

errno = EINTR;

647

623

goto mandos_end;

648

624

}

649

625

680

656

}

681

657

682

658

if(quit_now){

683

errno = EINTR;

684

659

goto mandos_end;

685

660

}

686

661

690

665

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

691

666

}

692

667

if(ret < 0){

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

668

perror("connect");

669

retval = -1;

698

670

goto mandos_end;

699

671

}

700

672

701

673

if(quit_now){

702

errno = EINTR;

703

674

goto mandos_end;

704

675

}

705

676

710

681

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

711

682

out_size - written));

712

683

if(ret == -1){

713

int e = errno;

714

684

perror("write");

715

errno = e;

685

retval = -1;

716

686

goto mandos_end;

717

687

}

718

688

written += (size_t)ret;

728

698

}

729

699

730

700

if(quit_now){

731

errno = EINTR;

732

701

goto mandos_end;

733

702

}

734

703

}

738

707

}

739

708

740

709

if(quit_now){

741

errno = EINTR;

742

710

goto mandos_end;

743

711

}

744

712

745

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

746

714

747

715

if(quit_now){

748

errno = EINTR;

749

716

goto mandos_end;

750

717

}

751

718

752

719

do {

753

720

ret = gnutls_handshake(session);

754

721

if(quit_now){

755

errno = EINTR;

756

722

goto mandos_end;

757

723

}

758

724

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

762

728

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

763

729

gnutls_perror(ret);

764

730

}

765

errno = EPROTO;

731

retval = -1;

766

732

goto mandos_end;

767

733

}

768

734

776

742

while(true){

777

743

778

744

if(quit_now){

779

errno = EINTR;

780

745

goto mandos_end;

781

746

}

782

747

783

748

buffer_capacity = incbuffer(&buffer, buffer_length,

784

749

buffer_capacity);

785

750

if(buffer_capacity == 0){

786

int e = errno;

787

751

perror("incbuffer");

788

errno = e;

752

retval = -1;

789

753

goto mandos_end;

790

754

}

791

755

792

756

if(quit_now){

793

errno = EINTR;

794

757

goto mandos_end;

795

758

}

796

759

809

772

ret = gnutls_handshake(session);

810

773

811

774

if(quit_now){

812

errno = EINTR;

813

775

goto mandos_end;

814

776

}

815

777

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

816

778

if(ret < 0){

817

779

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

818

780

gnutls_perror(ret);

819

errno = EPROTO;

781

retval = -1;

820

782

goto mandos_end;

821

783

}

822

784

break;

823

785

default:

824

786

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

825

787

" encrypted session with Mandos server\n");

788

retval = -1;

826

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

828

790

goto mandos_end;

829

791

}

830

792

} else {

837

799

}

838

800

839

801

if(quit_now){

840

errno = EINTR;

841

goto mandos_end;

842

}

843

844

do {

845

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

846

if(quit_now){

847

errno = EINTR;

848

goto mandos_end;

849

}

850

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

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

851

810

852

811

if(buffer_length > 0){

853

812

ssize_t decrypted_buffer_size;

859

818

written = 0;

860

819

while(written < (size_t) decrypted_buffer_size){

861

820

if(quit_now){

862

errno = EINTR;

863

821

goto mandos_end;

864

822

}

865

823

867

825

(size_t)decrypted_buffer_size - written,

868

826

stdout);

869

827

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

870

int e = errno;

871

828

if(debug){

872

829

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

873

830

strerror(errno));

874

831

}

875

errno = e;

876

goto mandos_end;

832

retval = -1;

833

break;

877

834

}

878

835

written += (size_t)ret;

879

836

}

880

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

881

840

}

841

} else {

842

retval = -1;

882

843

}

883

844

884

845

/* Shutdown procedure */

885

846

886

847

mandos_end:

887

{

888

int e = errno;

889

free(decrypted_buffer);

890

free(buffer);

891

if(tcp_sd >= 0){

892

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

893

}

894

if(ret == -1){

895

if(e == 0){

896

e = errno;

897

}

898

perror("close");

899

}

900

gnutls_deinit(session);

901

if(quit_now){

902

e = EINTR;

903

retval = -1;

904

}

905

errno = e;

848

free(buffer);

849

if(tcp_sd >= 0){

850

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

851

}

852

if(ret == -1){

853

perror("close");

854

}

855

gnutls_deinit(session);

856

if(quit_now){

857

retval = -1;

906

858

}

907

859

return retval;

908

860

}

1024

976

errno = old_errno;

1025

977

}

1026

978

1027

/*

1028

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

1029

* corresponds to an acceptable network device.

1030

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

1031

*/

1032

int good_interface(const struct dirent *if_entry){

1033

ssize_t ssret;

1034

char *flagname = NULL;

1035

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

1036

if_entry->d_name);

1037

if(ret < 0){

1038

perror("asprintf");

1039

return 0;

1040

}

1041

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

1042

return 0;

1043

}

1044

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

1045

if(flags_fd == -1){

1046

perror("open");

1047

return 0;

1048

}

1049

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

1050

/* read line from flags_fd */

1051

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

1052

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

1053

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

1054

if(flagstring == NULL){

1055

perror("malloc");

1056

close(flags_fd);

1057

return 0;

1058

}

1059

while(to_read > 0){

1060

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

1061

(size_t)to_read));

1062

if(ssret == -1){

1063

perror("read");

1064

free(flagstring);

1065

close(flags_fd);

1066

return 0;

1067

}

1068

to_read -= ssret;

1069

if(ssret == 0){

1070

break;

1071

}

1072

}

1073

close(flags_fd);

1074

intmax_t tmpmax;

1075

char *tmp;

1076

errno = 0;

1077

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

1078

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

1079

and not (isspace(*tmp)))

1080

or tmpmax != (ifreq_flags)tmpmax){

1081

if(debug){

1082

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

1083

flagstring, if_entry->d_name);

1084

}

1085

free(flagstring);

1086

return 0;

1087

}

1088

free(flagstring);

1089

ifreq_flags flags = (ifreq_flags)tmpmax;

1090

/* Reject the loopback device */

1091

if(flags & IFF_LOOPBACK){

1092

if(debug){

1093

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

1094

if_entry->d_name);

1095

}

1096

return 0;

1097

}

1098

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

1099

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

1100

if(debug){

1101

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

1102

if_entry->d_name);

1103

}

1104

return 1;

1105

}

1106

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

1107

if(not (flags & IFF_BROADCAST)){

1108

if(debug){

1109

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

1110

if_entry->d_name);

1111

}

1112

return 0;

1113

}

1114

/* Accept this device */

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 1;

1120

}

1121

1122

979

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

1123

980

AvahiSServiceBrowser *sb = NULL;

1124

981

int error;

1126

983

intmax_t tmpmax;

1127

984

char *tmp;

1128

985

int exitcode = EXIT_SUCCESS;

1129

const char *interface = "";

986

const char *interface = "eth0";

1130

987

struct ifreq network;

1131

988

int sd = -1;

1132

989

bool take_down_interface = false;

1133

990

uid_t uid;

1134

991

gid_t gid;

992

char *connect_to = NULL;

1135

993

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

1136

994

bool tempdir_created = false;

1137

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1200

1058

.arg = "SECONDS",

1201

1059

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

1202

1060

.group = 2 },

1203

/*

1204

* These reproduce what we would get without ARGP_NO_HELP

1205

*/

1206

{ .name = "help", .key = '?',

1207

.doc = "Give this help list", .group = -1 },

1208

{ .name = "usage", .key = -3,

1209

.doc = "Give a short usage message", .group = -1 },

1210

{ .name = "version", .key = 'V',

1211

.doc = "Print program version", .group = -1 },

1212

1061

{ .name = NULL }

1213

1062

};

1214

1063

1215

1064

error_t parse_opt(int key, char *arg,

1216

1065

struct argp_state *state){

1217

errno = 0;

1218

1066

switch(key){

1219

1067

case 128: /* --debug */

1220

1068

debug = true;

1236

1084

tmpmax = strtoimax(arg, &tmp, 10);

1237

1085

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

1238

1086

or tmpmax != (typeof(mc.dh_bits))tmpmax){

1239

argp_error(state, "Bad number of DH bits");

1087

fprintf(stderr, "Bad number of DH bits\n");

1088

exit(EXIT_FAILURE);

1240

1089

}

1241

1090

mc.dh_bits = (typeof(mc.dh_bits))tmpmax;

1242

1091

break;

1247

1096

errno = 0;

1248

1097

delay = strtof(arg, &tmp);

1249

1098

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

1250

argp_error(state, "Bad delay");

1099

fprintf(stderr, "Bad delay\n");

1100

exit(EXIT_FAILURE);

1251

1101

}

1252

1102

break;

1253

/*

1254

* These reproduce what we would get without ARGP_NO_HELP

1255

*/

1256

case '?': /* --help */

1257

argp_state_help(state, state->out_stream,

1258

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1259

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1260

case -3: /* --usage */

1261

argp_state_help(state, state->out_stream,

1262

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1263

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

1264

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

1265

exit(argp_err_exit_status);

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1266

1106

break;

1267

1107

default:

1268

1108

return ARGP_ERR_UNKNOWN;

1269

1109

}

1270

return errno;

1110

return 0;

1271

1111

}

1272

1112

1273

1113

struct argp argp = { .options = options, .parser = parse_opt,

1274

1114

.args_doc = "",

1275

1115

.doc = "Mandos client -- Get and decrypt"

1276

1116

" passwords from a Mandos server" };

1277

ret = argp_parse(&argp, argc, argv,

1278

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1279

switch(ret){

1280

case 0:

1281

break;

1282

case ENOMEM:

1283

default:

1284

errno = ret;

1285

perror("argp_parse");

1286

exitcode = EX_OSERR;

1287

goto end;

1288

case EINVAL:

1289

exitcode = EX_USAGE;

1117

ret = argp_parse(&argp, argc, argv, 0, 0, NULL);

1118

if(ret == ARGP_ERR_UNKNOWN){

1119

fprintf(stderr, "Unknown error while parsing arguments\n");

1120

exitcode = EXIT_FAILURE;

1290

1121

goto end;

1291

1122

}

1292

1123

}

1294

1125

if(not debug){

1295

1126

avahi_set_log_function(empty_log);

1296

1127

}

1297

1298

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

1299

struct dirent **direntries;

1300

ret = scandir(sys_class_net, &direntries, good_interface,

1301

alphasort);

1302

if(ret >= 1){

1303

/* Pick the first good interface */

1304

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

1305

if(debug){

1306

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

1307

}

1308

if(interface == NULL){

1309

perror("malloc");

1310

free(direntries);

1311

exitcode = EXIT_FAILURE;

1312

goto end;

1313

}

1314

free(direntries);

1315

} else {

1316

free(direntries);

1317

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

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

}

1322

1128

1323

1129

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

1324

1130

from the signal handler */

1327

1133

mc.simple_poll = avahi_simple_poll_new();

1328

1134

if(mc.simple_poll == NULL){

1329

1135

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

1330

exitcode = EX_UNAVAILABLE;

1136

exitcode = EXIT_FAILURE;

1331

1137

goto end;

1332

1138

}

1333

1139

1335

1141

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

1336

1142

if(ret == -1){

1337

1143

perror("sigaddset");

1338

exitcode = EX_OSERR;

1144

exitcode = EXIT_FAILURE;

1339

1145

goto end;

1340

1146

}

1341

1147

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

1342

1148

if(ret == -1){

1343

1149

perror("sigaddset");

1344

exitcode = EX_OSERR;

1150

exitcode = EXIT_FAILURE;

1345

1151

goto end;

1346

1152

}

1347

1153

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

1348

1154

if(ret == -1){

1349

1155

perror("sigaddset");

1350

exitcode = EX_OSERR;

1156

exitcode = EXIT_FAILURE;

1351

1157

goto end;

1352

1158

}

1353

1159

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

1357

1163

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

1358

1164

if(ret == -1){

1359

1165

perror("sigaction");

1360

return EX_OSERR;

1166

return EXIT_FAILURE;

1361

1167

}

1362

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1363

1169

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

1364

1170

if(ret == -1){

1365

1171

perror("sigaction");

1366

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1367

1173

goto end;

1368

1174

}

1369

1175

}

1370

1176

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

1371

1177

if(ret == -1){

1372

1178

perror("sigaction");

1373

return EX_OSERR;

1179

return EXIT_FAILURE;

1374

1180

}

1375

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1376

1182

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

1377

1183

if(ret == -1){

1378

1184

perror("sigaction");

1379

exitcode = EX_OSERR;

1185

exitcode = EXIT_FAILURE;

1380

1186

goto end;

1381

1187

}

1382

1188

}

1383

1189

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

1384

1190

if(ret == -1){

1385

1191

perror("sigaction");

1386

return EX_OSERR;

1192

return EXIT_FAILURE;

1387

1193

}

1388

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1389

1195

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

1390

1196

if(ret == -1){

1391

1197

perror("sigaction");

1392

exitcode = EX_OSERR;

1198

exitcode = EXIT_FAILURE;

1393

1199

goto end;

1394

1200

}

1395

1201

}

1396

1202

1397

1203

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

1398

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

1204

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

1399

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1400

1206

if(if_index == 0){

1401

1207

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

1402

exitcode = EX_UNAVAILABLE;

1208

exitcode = EXIT_FAILURE;

1403

1209

goto end;

1404

1210

}

1405

1211

1416

1222

1417

1223

#ifdef __linux__

1418

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1419

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

1225

messages to mess up the prompt */

1420

1226

ret = klogctl(8, NULL, 5);

1421

1227

bool restore_loglevel = true;

1422

1228

if(ret == -1){

1428

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1429

1235

if(sd < 0){

1430

1236

perror("socket");

1431

exitcode = EX_OSERR;

1237

exitcode = EXIT_FAILURE;

1432

1238

#ifdef __linux__

1433

1239

if(restore_loglevel){

1434

1240

ret = klogctl(7, NULL, 0);

1457

1263

}

1458

1264

}

1459

1265

#endif /* __linux__ */

1460

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1461

1267

/* Lower privileges */

1462

1268

errno = 0;

1463

1269

ret = seteuid(uid);

1472

1278

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

1473

1279

if(ret == -1){

1474

1280

take_down_interface = false;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1477

1283

#ifdef __linux__

1478

1284

if(restore_loglevel){

1479

1285

ret = klogctl(7, NULL, 0);

1545

1351

ret = init_gnutls_global(pubkey, seckey);

1546

1352

if(ret == -1){

1547

1353

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

1548

exitcode = EX_UNAVAILABLE;

1354

exitcode = EXIT_FAILURE;

1549

1355

goto end;

1550

1356

} else {

1551

1357

gnutls_initialized = true;

1568

1374

1569

1375

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

1570

1376

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

1571

exitcode = EX_UNAVAILABLE;

1377

exitcode = EXIT_FAILURE;

1572

1378

goto end;

1573

1379

} else {

1574

1380

gpgme_initialized = true;

1584

1390

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

1585

1391

if(address == NULL){

1586

1392

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

1587

exitcode = EX_USAGE;

1393

exitcode = EXIT_FAILURE;

1588

1394

goto end;

1589

1395

}

1590

1396

1598

1404

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

1599

1405

or tmpmax != (uint16_t)tmpmax){

1600

1406

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

1601

exitcode = EX_USAGE;

1407

exitcode = EXIT_FAILURE;

1602

1408

goto end;

1603

1409

}

1604

1410

1620

1426

if(quit_now){

1621

1427

goto end;

1622

1428

}

1623

1624

while(not quit_now){

1625

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

1626

if(quit_now or ret == 0){

1627

break;

1628

}

1629

sleep(15);

1630

};

1631

1632

if (not quit_now){

1429

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

1633

1434

exitcode = EXIT_SUCCESS;

1634

1435

}

1635

1636

1436

goto end;

1637

1437

}

1638

1438

1662

1462

if(mc.server == NULL){

1663

1463

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

1664

1464

avahi_strerror(error));

1665

exitcode = EX_UNAVAILABLE;

1465

exitcode = EXIT_FAILURE;

1666

1466

goto end;

1667

1467

}

1668

1468

1677

1477

if(sb == NULL){

1678

1478

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

1679

1479

avahi_strerror(avahi_server_errno(mc.server)));

1680

exitcode = EX_UNAVAILABLE;

1480

exitcode = EXIT_FAILURE;

1681

1481

goto end;

1682

1482

}

1683

1483

1732

1532

if(ret == -1){

1733

1533

perror("ioctl SIOCGIFFLAGS");

1734

1534

} else if(network.ifr_flags & IFF_UP) {

1735

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

1535

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

1736

1536

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

1737

1537

if(ret == -1){

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

1739

1539

}

1740

1540

}

1741

1541

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

1798

1598

if(quit_now){

1799

1599

sigemptyset(&old_sigterm_action.sa_mask);

1800

1600

old_sigterm_action.sa_handler = SIG_DFL;

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1601

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

1804

1602

if(ret == -1){

1805

1603

perror("sigaction");

1806

1604

}

1807

do {

1808

ret = raise(signal_received);

1809

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

1810

if(ret != 0){

1811

perror("raise");

1812

abort();

1813

}

1814

TEMP_FAILURE_RETRY(pause());

1605

raise(signal_received);

1815

1606

}

1816

1607

1817

1608

return exitcode;