/mandos/trunk : revision 460

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

43

stdout, ferror(), remove() */

44

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

45

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

46

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

47

srand(), strtof() */

46

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

47

strtof(), abort() */

48

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

49

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

50

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

63

strtoimax() */

64

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

65

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

66

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

66

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

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() */

75

setgid(), pause() */

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 */

85

87

86

88

#ifdef __linux__

87

89

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

125

127

static const char mandos_protocol_version[] = "1";

126

128

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

127

129

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;

128

132

129

133

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

130

134

typedef struct {

142

146

.dh_bits = 1024, .priority = "SECURE256"

143

147

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

144

148

149

sig_atomic_t quit_now = 0;

150

int signal_received = 0;

151

145

152

/*

146

153

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

147

154

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

476

483

/* GnuTLS session creation */

477

484

do {

478

485

ret = gnutls_init(session, GNUTLS_SERVER);

486

if(quit_now){

487

return -1;

488

}

479

489

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

480

490

if(ret != GNUTLS_E_SUCCESS){

481

491

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

486

496

const char *err;

487

497

do {

488

498

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

499

if(quit_now){

500

gnutls_deinit(*session);

501

return -1;

502

}

489

503

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

490

504

if(ret != GNUTLS_E_SUCCESS){

491

505

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

499

513

do {

500

514

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

501

515

mc.cred);

516

if(quit_now){

517

gnutls_deinit(*session);

518

return -1;

519

}

502

520

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

503

521

if(ret != GNUTLS_E_SUCCESS){

504

522

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

519

537

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

520

538

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

521

539

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

525

540

/* Called when a Mandos server is found */

526

541

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

527

542

AvahiIfIndex if_index,

533

548

struct sockaddr_in6 in6;

534

549

} to;

535

550

char *buffer = NULL;

536

char *decrypted_buffer;

551

char *decrypted_buffer = NULL;

537

552

size_t buffer_length = 0;

538

553

size_t buffer_capacity = 0;

539

554

size_t written;

540

int retval = 0;

555

int retval = -1;

541

556

gnutls_session_t session;

542

557

int pf; /* Protocol family */

543

558

559

errno = 0;

560

544

561

if(quit_now){

562

errno = EINTR;

545

563

return -1;

546

564

}

547

565

554

572

break;

555

573

default:

556

574

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

575

errno = EINVAL;

557

576

return -1;

558

577

}

559

578

569

588

570

589

tcp_sd = socket(pf, SOCK_STREAM, 0);

571

590

if(tcp_sd < 0){

591

int e = errno;

572

592

perror("socket");

573

retval = -1;

593

errno = e;

574

594

goto mandos_end;

575

595

}

576

596

577

597

if(quit_now){

598

errno = EINTR;

578

599

goto mandos_end;

579

600

}

580

601

587

608

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

588

609

}

589

610

if(ret < 0 ){

611

int e = errno;

590

612

perror("inet_pton");

591

retval = -1;

613

errno = e;

592

614

goto mandos_end;

593

615

}

594

616

if(ret == 0){

617

int e = errno;

595

618

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

596

retval = -1;

619

errno = e;

597

620

goto mandos_end;

598

621

}

599

622

if(af == AF_INET6){

607

630

if(if_index == AVAHI_IF_UNSPEC){

608

631

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

609

632

" without a network interface\n");

610

retval = -1;

633

errno = EINVAL;

611

634

goto mandos_end;

612

635

}

613

636

/* Set the network interface number as scope */

620

643

}

621

644

622

645

if(quit_now){

646

errno = EINTR;

623

647

goto mandos_end;

624

648

}

625

649

656

680

}

657

681

658

682

if(quit_now){

683

errno = EINTR;

659

684

goto mandos_end;

660

685

}

661

686

665

690

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

666

691

}

667

692

if(ret < 0){

668

perror("connect");

669

retval = -1;

693

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

694

int e = errno;

695

perror("connect");

696

errno = e;

697

}

670

698

goto mandos_end;

671

699

}

672

700

673

701

if(quit_now){

702

errno = EINTR;

674

703

goto mandos_end;

675

704

}

676

705

681

710

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

682

711

out_size - written));

683

712

if(ret == -1){

713

int e = errno;

684

714

perror("write");

685

retval = -1;

715

errno = e;

686

716

goto mandos_end;

687

717

}

688

718

written += (size_t)ret;

698

728

}

699

729

700

730

if(quit_now){

731

errno = EINTR;

701

732

goto mandos_end;

702

733

}

703

734

}

707

738

}

708

739

709

740

if(quit_now){

741

errno = EINTR;

710

742

goto mandos_end;

711

743

}

712

744

713

745

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

714

746

715

747

if(quit_now){

748

errno = EINTR;

716

749

goto mandos_end;

717

750

}

718

751

719

752

do {

720

753

ret = gnutls_handshake(session);

721

754

if(quit_now){

755

errno = EINTR;

722

756

goto mandos_end;

723

757

}

724

758

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

728

762

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

729

763

gnutls_perror(ret);

730

764

}

731

retval = -1;

765

errno = EPROTO;

732

766

goto mandos_end;

733

767

}

734

768

742

776

while(true){

743

777

744

778

if(quit_now){

779

errno = EINTR;

745

780

goto mandos_end;

746

781

}

747

782

748

783

buffer_capacity = incbuffer(&buffer, buffer_length,

749

784

buffer_capacity);

750

785

if(buffer_capacity == 0){

786

int e = errno;

751

787

perror("incbuffer");

752

retval = -1;

788

errno = e;

753

789

goto mandos_end;

754

790

}

755

791

756

792

if(quit_now){

793

errno = EINTR;

757

794

goto mandos_end;

758

795

}

759

796

772

809

ret = gnutls_handshake(session);

773

810

774

811

if(quit_now){

812

errno = EINTR;

775

813

goto mandos_end;

776

814

}

777

815

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

778

816

if(ret < 0){

779

817

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

780

818

gnutls_perror(ret);

781

retval = -1;

819

errno = EPROTO;

782

820

goto mandos_end;

783

821

}

784

822

break;

785

823

default:

786

824

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

787

825

" encrypted session with Mandos server\n");

788

retval = -1;

789

826

gnutls_bye(session, GNUTLS_SHUT_RDWR);

827

errno = EIO;

790

828

goto mandos_end;

791

829

}

792

830

} else {

799

837

}

800

838

801

839

if(quit_now){

802

goto mandos_end;

803

}

804

805

gnutls_bye(session, GNUTLS_SHUT_RDWR);

806

807

if(quit_now){

808

goto mandos_end;

809

}

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);

810

851

811

852

if(buffer_length > 0){

812

853

ssize_t decrypted_buffer_size;

818

859

written = 0;

819

860

while(written < (size_t) decrypted_buffer_size){

820

861

if(quit_now){

862

errno = EINTR;

821

863

goto mandos_end;

822

864

}

823

865

825

867

(size_t)decrypted_buffer_size - written,

826

868

stdout);

827

869

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

870

int e = errno;

828

871

if(debug){

829

872

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

830

873

strerror(errno));

831

874

}

832

retval = -1;

833

break;

875

errno = e;

876

goto mandos_end;

834

877

}

835

878

written += (size_t)ret;

836

879

}

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

880

retval = 0;

840

881

}

841

} else {

842

retval = -1;

843

882

}

844

883

845

884

/* Shutdown procedure */

846

885

847

886

mandos_end:

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;

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;

858

906

}

859

907

return retval;

860

908

}

976

1024

errno = old_errno;

977

1025

}

978

1026

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

979

1122

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

980

1123

AvahiSServiceBrowser *sb = NULL;

981

1124

int error;

983

1126

intmax_t tmpmax;

984

1127

char *tmp;

985

1128

int exitcode = EXIT_SUCCESS;

986

const char *interface = "eth0";

1129

const char *interface = "";

987

1130

struct ifreq network;

988

1131

int sd = -1;

989

1132

bool take_down_interface = false;

990

1133

uid_t uid;

991

1134

gid_t gid;

992

char *connect_to = NULL;

993

1135

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

994

1136

bool tempdir_created = false;

995

1137

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1058

1200

.arg = "SECONDS",

1059

1201

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

1060

1202

.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 },

1061

1212

{ .name = NULL }

1062

1213

};

1063

1214

1064

1215

error_t parse_opt(int key, char *arg,

1065

1216

struct argp_state *state){

1217

errno = 0;

1066

1218

switch(key){

1067

1219

case 128: /* --debug */

1068

1220

debug = true;

1084

1236

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

1085

1237

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

1086

1238

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

1087

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

1088

exit(EXIT_FAILURE);

1239

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

1089

1240

}

1090

1241

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

1091

1242

break;

1096

1247

errno = 0;

1097

1248

delay = strtof(arg, &tmp);

1098

1249

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

1099

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

1100

exit(EXIT_FAILURE);

1250

argp_error(state, "Bad delay");

1101

1251

}

1102

1252

break;

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

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);

1106

1266

break;

1107

1267

default:

1108

1268

return ARGP_ERR_UNKNOWN;

1109

1269

}

1110

return 0;

1270

return errno;

1111

1271

}

1112

1272

1113

1273

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

1114

1274

.args_doc = "",

1115

1275

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

1116

1276

" passwords from a Mandos server" };

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;

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;

1121

1290

goto end;

1122

1291

}

1123

1292

}

1125

1294

if(not debug){

1126

1295

avahi_set_log_function(empty_log);

1127

1296

}

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

}

1128

1322

1129

1323

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

1130

1324

from the signal handler */

1133

1327

mc.simple_poll = avahi_simple_poll_new();

1134

1328

if(mc.simple_poll == NULL){

1135

1329

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

1136

exitcode = EXIT_FAILURE;

1330

exitcode = EX_UNAVAILABLE;

1137

1331

goto end;

1138

1332

}

1139

1333

1141

1335

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

1142

1336

if(ret == -1){

1143

1337

perror("sigaddset");

1144

exitcode = EXIT_FAILURE;

1338

exitcode = EX_OSERR;

1145

1339

goto end;

1146

1340

}

1147

1341

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

1148

1342

if(ret == -1){

1149

1343

perror("sigaddset");

1150

exitcode = EXIT_FAILURE;

1344

exitcode = EX_OSERR;

1151

1345

goto end;

1152

1346

}

1153

1347

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

1154

1348

if(ret == -1){

1155

1349

perror("sigaddset");

1156

exitcode = EXIT_FAILURE;

1350

exitcode = EX_OSERR;

1157

1351

goto end;

1158

1352

}

1159

1353

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

1163

1357

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

1164

1358

if(ret == -1){

1165

1359

perror("sigaction");

1166

return EXIT_FAILURE;

1360

return EX_OSERR;

1167

1361

}

1168

1362

if(old_sigterm_action.sa_handler != SIG_IGN){

1169

1363

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

1170

1364

if(ret == -1){

1171

1365

perror("sigaction");

1172

exitcode = EXIT_FAILURE;

1366

exitcode = EX_OSERR;

1173

1367

goto end;

1174

1368

}

1175

1369

}

1176

1370

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

1177

1371

if(ret == -1){

1178

1372

perror("sigaction");

1179

return EXIT_FAILURE;

1373

return EX_OSERR;

1180

1374

}

1181

1375

if(old_sigterm_action.sa_handler != SIG_IGN){

1182

1376

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

1183

1377

if(ret == -1){

1184

1378

perror("sigaction");

1185

exitcode = EXIT_FAILURE;

1379

exitcode = EX_OSERR;

1186

1380

goto end;

1187

1381

}

1188

1382

}

1189

1383

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

1190

1384

if(ret == -1){

1191

1385

perror("sigaction");

1192

return EXIT_FAILURE;

1386

return EX_OSERR;

1193

1387

}

1194

1388

if(old_sigterm_action.sa_handler != SIG_IGN){

1195

1389

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

1196

1390

if(ret == -1){

1197

1391

perror("sigaction");

1198

exitcode = EXIT_FAILURE;

1392

exitcode = EX_OSERR;

1199

1393

goto end;

1200

1394

}

1201

1395

}

1202

1396

1203

1397

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

1204

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

1398

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

1205

1399

if_index = (AvahiIfIndex) if_nametoindex(interface);

1206

1400

if(if_index == 0){

1207

1401

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

1208

exitcode = EXIT_FAILURE;

1402

exitcode = EX_UNAVAILABLE;

1209

1403

goto end;

1210

1404

}

1211

1405

1222

1416

1223

1417

#ifdef __linux__

1224

1418

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1225

messages to mess up the prompt */

1419

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

1226

1420

ret = klogctl(8, NULL, 5);

1227

1421

bool restore_loglevel = true;

1228

1422

if(ret == -1){

1234

1428

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1235

1429

if(sd < 0){

1236

1430

perror("socket");

1237

exitcode = EXIT_FAILURE;

1431

exitcode = EX_OSERR;

1238

1432

#ifdef __linux__

1239

1433

if(restore_loglevel){

1240

1434

ret = klogctl(7, NULL, 0);

1263

1457

}

1264

1458

}

1265

1459

#endif /* __linux__ */

1266

exitcode = EXIT_FAILURE;

1460

exitcode = EX_OSERR;

1267

1461

/* Lower privileges */

1268

1462

errno = 0;

1269

1463

ret = seteuid(uid);

1278

1472

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

1279

1473

if(ret == -1){

1280

1474

take_down_interface = false;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1475

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1476

exitcode = EX_OSERR;

1283

1477

#ifdef __linux__

1284

1478

if(restore_loglevel){

1285

1479

ret = klogctl(7, NULL, 0);

1351

1545

ret = init_gnutls_global(pubkey, seckey);

1352

1546

if(ret == -1){

1353

1547

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

1354

exitcode = EXIT_FAILURE;

1548

exitcode = EX_UNAVAILABLE;

1355

1549

goto end;

1356

1550

} else {

1357

1551

gnutls_initialized = true;

1374

1568

1375

1569

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

1376

1570

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

1377

exitcode = EXIT_FAILURE;

1571

exitcode = EX_UNAVAILABLE;

1378

1572

goto end;

1379

1573

} else {

1380

1574

gpgme_initialized = true;

1390

1584

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

1391

1585

if(address == NULL){

1392

1586

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

1393

exitcode = EXIT_FAILURE;

1587

exitcode = EX_USAGE;

1394

1588

goto end;

1395

1589

}

1396

1590

1404

1598

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

1405

1599

or tmpmax != (uint16_t)tmpmax){

1406

1600

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

1407

exitcode = EXIT_FAILURE;

1601

exitcode = EX_USAGE;

1408

1602

goto end;

1409

1603

}

1410

1604

1426

1620

if(quit_now){

1427

1621

goto end;

1428

1622

}

1429

1430

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

1431

if(ret < 0){

1432

exitcode = EXIT_FAILURE;

1433

} else {

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){

1434

1633

exitcode = EXIT_SUCCESS;

1435

1634

}

1635

1436

1636

goto end;

1437

1637

}

1438

1638

1462

1662

if(mc.server == NULL){

1463

1663

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

1464

1664

avahi_strerror(error));

1465

exitcode = EXIT_FAILURE;

1665

exitcode = EX_UNAVAILABLE;

1466

1666

goto end;

1467

1667

}

1468

1668

1477

1677

if(sb == NULL){

1478

1678

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

1479

1679

avahi_strerror(avahi_server_errno(mc.server)));

1480

exitcode = EXIT_FAILURE;

1680

exitcode = EX_UNAVAILABLE;

1481

1681

goto end;

1482

1682

}

1483

1683

1532

1732

if(ret == -1){

1533

1733

perror("ioctl SIOCGIFFLAGS");

1534

1734

} else if(network.ifr_flags & IFF_UP) {

1535

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

1735

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

1536

1736

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

1537

1737

if(ret == -1){

1538

perror("ioctl SIOCSIFFLAGS");

1738

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1539

1739

}

1540

1740

}

1541

1741

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

1598

1798

if(quit_now){

1599

1799

sigemptyset(&old_sigterm_action.sa_mask);

1600

1800

old_sigterm_action.sa_handler = SIG_DFL;

1601

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

1801

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1802

&old_sigterm_action,

1803

NULL));

1602

1804

if(ret == -1){

1603

1805

perror("sigaction");

1604

1806

}

1605

raise(signal_received);

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());

1606

1815

}

1607

1816

1608

1817

return exitcode;