/mandos/trunk : revision 370

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, 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() */

76

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

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

79

argp_state, struct argp,

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,

423

416

}

424

417

425

418

/* OpenPGP credentials */

426

ret = gnutls_certificate_allocate_credentials(&mc.cred);

419

gnutls_certificate_allocate_credentials(&mc.cred);

427

420

if(ret != GNUTLS_E_SUCCESS){

428

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

421

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

422

from

423

-Wunreachable-code

424

*/

429

425

safer_gnutls_strerror(ret));

430

426

gnutls_global_deinit();

431

427

return -1;

480

476

/* GnuTLS session creation */

481

477

do {

482

478

ret = gnutls_init(session, GNUTLS_SERVER);

483

if(quit_now){

484

return -1;

485

}

486

479

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

487

480

if(ret != GNUTLS_E_SUCCESS){

488

481

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

493

486

const char *err;

494

487

do {

495

488

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

496

if(quit_now){

497

gnutls_deinit(*session);

498

return -1;

499

}

500

489

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

501

490

if(ret != GNUTLS_E_SUCCESS){

502

491

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

510

499

do {

511

500

ret = gnutls_credentials_set(*session, GNUTLS_CRD_CERTIFICATE,

512

501

mc.cred);

513

if(quit_now){

514

gnutls_deinit(*session);

515

return -1;

516

}

517

502

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

518

503

if(ret != GNUTLS_E_SUCCESS){

519

504

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

534

519

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

535

520

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

536

521

522

sig_atomic_t quit_now = 0;

523

int signal_received = 0;

524

537

525

/* Called when a Mandos server is found */

538

526

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

539

527

AvahiIfIndex if_index,

545

533

struct sockaddr_in6 in6;

546

534

} to;

547

535

char *buffer = NULL;

548

char *decrypted_buffer = NULL;

536

char *decrypted_buffer;

549

537

size_t buffer_length = 0;

550

538

size_t buffer_capacity = 0;

551

539

size_t written;

552

int retval = -1;

540

int retval = 0;

553

541

gnutls_session_t session;

554

542

int pf; /* Protocol family */

555

543

556

errno = 0;

557

558

544

if(quit_now){

559

errno = EINTR;

560

545

return -1;

561

546

}

562

547

569

554

break;

570

555

default:

571

556

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

572

errno = EINVAL;

573

557

return -1;

574

558

}

575

559

585

569

586

570

tcp_sd = socket(pf, SOCK_STREAM, 0);

587

571

if(tcp_sd < 0){

588

int e = errno;

589

572

perror("socket");

590

errno = e;

573

retval = -1;

591

574

goto mandos_end;

592

575

}

593

576

594

577

if(quit_now){

595

errno = EINTR;

596

578

goto mandos_end;

597

579

}

598

580

605

587

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

606

588

}

607

589

if(ret < 0 ){

608

int e = errno;

609

590

perror("inet_pton");

610

errno = e;

591

retval = -1;

611

592

goto mandos_end;

612

593

}

613

594

if(ret == 0){

614

int e = errno;

615

595

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

616

errno = e;

596

retval = -1;

617

597

goto mandos_end;

618

598

}

619

599

if(af == AF_INET6){

627

607

if(if_index == AVAHI_IF_UNSPEC){

628

608

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

629

609

" without a network interface\n");

630

errno = EINVAL;

610

retval = -1;

631

611

goto mandos_end;

632

612

}

633

613

/* Set the network interface number as scope */

640

620

}

641

621

642

622

if(quit_now){

643

errno = EINTR;

644

623

goto mandos_end;

645

624

}

646

625

677

656

}

678

657

679

658

if(quit_now){

680

errno = EINTR;

681

659

goto mandos_end;

682

660

}

683

661

687

665

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

688

666

}

689

667

if(ret < 0){

690

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

691

int e = errno;

692

perror("connect");

693

errno = e;

694

}

668

perror("connect");

669

retval = -1;

695

670

goto mandos_end;

696

671

}

697

672

698

673

if(quit_now){

699

errno = EINTR;

700

674

goto mandos_end;

701

675

}

702

676

707

681

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

708

682

out_size - written));

709

683

if(ret == -1){

710

int e = errno;

711

684

perror("write");

712

errno = e;

685

retval = -1;

713

686

goto mandos_end;

714

687

}

715

688

written += (size_t)ret;

725

698

}

726

699

727

700

if(quit_now){

728

errno = EINTR;

729

701

goto mandos_end;

730

702

}

731

703

}

735

707

}

736

708

737

709

if(quit_now){

738

errno = EINTR;

739

710

goto mandos_end;

740

711

}

741

712

742

713

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

743

714

744

715

if(quit_now){

745

errno = EINTR;

746

716

goto mandos_end;

747

717

}

748

718

749

719

do {

750

720

ret = gnutls_handshake(session);

751

721

if(quit_now){

752

errno = EINTR;

753

722

goto mandos_end;

754

723

}

755

724

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

759

728

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

760

729

gnutls_perror(ret);

761

730

}

762

errno = EPROTO;

731

retval = -1;

763

732

goto mandos_end;

764

733

}

765

734

773

742

while(true){

774

743

775

744

if(quit_now){

776

errno = EINTR;

777

745

goto mandos_end;

778

746

}

779

747

780

748

buffer_capacity = incbuffer(&buffer, buffer_length,

781

749

buffer_capacity);

782

750

if(buffer_capacity == 0){

783

int e = errno;

784

751

perror("incbuffer");

785

errno = e;

752

retval = -1;

786

753

goto mandos_end;

787

754

}

788

755

789

756

if(quit_now){

790

errno = EINTR;

791

757

goto mandos_end;

792

758

}

793

759

806

772

ret = gnutls_handshake(session);

807

773

808

774

if(quit_now){

809

errno = EINTR;

810

775

goto mandos_end;

811

776

}

812

777

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

813

778

if(ret < 0){

814

779

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

815

780

gnutls_perror(ret);

816

errno = EPROTO;

781

retval = -1;

817

782

goto mandos_end;

818

783

}

819

784

break;

820

785

default:

821

786

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

822

787

" encrypted session with Mandos server\n");

788

retval = -1;

823

789

gnutls_bye(session, GNUTLS_SHUT_RDWR);

824

errno = EIO;

825

790

goto mandos_end;

826

791

}

827

792

} else {

834

799

}

835

800

836

801

if(quit_now){

837

errno = EINTR;

838

goto mandos_end;

839

}

840

841

do {

842

ret = gnutls_bye(session, GNUTLS_SHUT_RDWR);

843

if(quit_now){

844

errno = EINTR;

845

goto mandos_end;

846

}

847

} 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

}

848

810

849

811

if(buffer_length > 0){

850

812

ssize_t decrypted_buffer_size;

856

818

written = 0;

857

819

while(written < (size_t) decrypted_buffer_size){

858

820

if(quit_now){

859

errno = EINTR;

860

821

goto mandos_end;

861

822

}

862

823

864

825

(size_t)decrypted_buffer_size - written,

865

826

stdout);

866

827

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

867

int e = errno;

868

828

if(debug){

869

829

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

870

830

strerror(errno));

871

831

}

872

errno = e;

873

goto mandos_end;

832

retval = -1;

833

break;

874

834

}

875

835

written += (size_t)ret;

876

836

}

877

retval = 0;

837

free(decrypted_buffer);

838

} else {

839

retval = -1;

878

840

}

841

} else {

842

retval = -1;

879

843

}

880

844

881

845

/* Shutdown procedure */

882

846

883

847

mandos_end:

884

{

885

int e = errno;

886

free(decrypted_buffer);

887

free(buffer);

888

if(tcp_sd >= 0){

889

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

890

}

891

if(ret == -1){

892

if(e == 0){

893

e = errno;

894

}

895

perror("close");

896

}

897

gnutls_deinit(session);

898

if(quit_now){

899

e = EINTR;

900

retval = -1;

901

}

902

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;

903

858

}

904

859

return retval;

905

860

}

1021

976

errno = old_errno;

1022

977

}

1023

978

1024

/*

1025

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

1026

* corresponds to an acceptable network device.

1027

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

1028

*/

1029

int good_interface(const struct dirent *if_entry){

1030

ssize_t ssret;

1031

char *flagname = NULL;

1032

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

1033

return 0;

1034

}

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

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

1042

if(flags_fd == -1){

1043

perror("open");

1044

free(flagname);

1045

return 0;

1046

}

1047

free(flagname);

1048

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

1049

/* read line from flags_fd */

1050

ssize_t to_read = 2+(sizeof(ifreq_flags)*2)+1; /* "0x1003\n" */

1051

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

1052

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

1053

if(flagstring == NULL){

1054

perror("malloc");

1055

close(flags_fd);

1056

return 0;

1057

}

1058

while(to_read > 0){

1059

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

1060

(size_t)to_read));

1061

if(ssret == -1){

1062

perror("read");

1063

free(flagstring);

1064

close(flags_fd);

1065

return 0;

1066

}

1067

to_read -= ssret;

1068

if(ssret == 0){

1069

break;

1070

}

1071

}

1072

close(flags_fd);

1073

intmax_t tmpmax;

1074

char *tmp;

1075

errno = 0;

1076

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

1077

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

1078

and not (isspace(*tmp)))

1079

or tmpmax != (ifreq_flags)tmpmax){

1080

if(debug){

1081

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

1082

flagstring, if_entry->d_name);

1083

}

1084

free(flagstring);

1085

return 0;

1086

}

1087

free(flagstring);

1088

ifreq_flags flags = (ifreq_flags)tmpmax;

1089

/* Reject the loopback device */

1090

if(flags & IFF_LOOPBACK){

1091

if(debug){

1092

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

1093

if_entry->d_name);

1094

}

1095

return 0;

1096

}

1097

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

1098

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

1099

if(debug){

1100

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

1101

if_entry->d_name);

1102

}

1103

return 1;

1104

}

1105

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

1106

if(not (flags & IFF_BROADCAST)){

1107

if(debug){

1108

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

1109

if_entry->d_name);

1110

}

1111

return 0;

1112

}

1113

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

1114

if(flags & IFF_NOARP){

1115

if(debug){

1116

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

1117

if_entry->d_name);

1118

}

1119

return 0;

1120

}

1121

/* Accept this device */

1122

if(debug){

1123

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

1124

if_entry->d_name);

1125

}

1126

return 1;

1127

}

1128

1129

979

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

1130

980

AvahiSServiceBrowser *sb = NULL;

1131

981

int error;

1133

983

intmax_t tmpmax;

1134

984

char *tmp;

1135

985

int exitcode = EXIT_SUCCESS;

1136

const char *interface = "";

986

const char *interface = "eth0";

1137

987

struct ifreq network;

1138

988

int sd = -1;

1139

989

bool take_down_interface = false;

1140

990

uid_t uid;

1141

991

gid_t gid;

992

char *connect_to = NULL;

1142

993

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

1143

994

bool tempdir_created = false;

1144

995

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1207

1058

.arg = "SECONDS",

1208

1059

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

1209

1060

.group = 2 },

1210

/*

1211

* These reproduce what we would get without ARGP_NO_HELP

1212

*/

1213

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

1214

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

1215

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

1216

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

1217

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

1218

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

1219

1061

{ .name = NULL }

1220

1062

};

1221

1063

1222

1064

error_t parse_opt(int key, char *arg,

1223

1065

struct argp_state *state){

1224

errno = 0;

1225

1066

switch(key){

1226

1067

case 128: /* --debug */

1227

1068

debug = true;

1243

1084

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

1244

1085

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

1245

1086

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

1246

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

1087

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

1088

exit(EXIT_FAILURE);

1247

1089

}

1248

1090

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

1249

1091

break;

1254

1096

errno = 0;

1255

1097

delay = strtof(arg, &tmp);

1256

1098

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

1257

argp_error(state, "Bad delay");

1099

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

1100

exit(EXIT_FAILURE);

1258

1101

}

1259

1102

break;

1260

/*

1261

* These reproduce what we would get without ARGP_NO_HELP

1262

*/

1263

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

1264

argp_state_help(state, state->out_stream,

1265

(ARGP_HELP_STD_HELP | ARGP_HELP_EXIT_ERR)

1266

& ~(unsigned int)ARGP_HELP_EXIT_OK);

1267

case -3: /* --usage */

1268

argp_state_help(state, state->out_stream,

1269

ARGP_HELP_USAGE | ARGP_HELP_EXIT_ERR);

1270

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

1271

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

1272

exit(argp_err_exit_status);

1103

case ARGP_KEY_ARG:

1104

argp_usage(state);

1105

case ARGP_KEY_END:

1273

1106

break;

1274

1107

default:

1275

1108

return ARGP_ERR_UNKNOWN;

1276

1109

}

1277

return errno;

1110

return 0;

1278

1111

}

1279

1112

1280

1113

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

1281

1114

.args_doc = "",

1282

1115

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

1283

1116

" passwords from a Mandos server" };

1284

ret = argp_parse(&argp, argc, argv,

1285

ARGP_IN_ORDER | ARGP_NO_HELP, 0, NULL);

1286

switch(ret){

1287

case 0:

1288

break;

1289

case ENOMEM:

1290

default:

1291

errno = ret;

1292

perror("argp_parse");

1293

exitcode = EX_OSERR;

1294

goto end;

1295

case EINVAL:

1296

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;

1297

1121

goto end;

1298

1122

}

1299

1123

}

1301

1125

if(not debug){

1302

1126

avahi_set_log_function(empty_log);

1303

1127

}

1304

1305

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

1306

struct dirent **direntries;

1307

ret = scandir(sys_class_net, &direntries, good_interface,

1308

alphasort);

1309

if(ret >= 1){

1310

/* Pick the first good interface */

1311

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

1312

if(debug){

1313

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

1314

}

1315

if(interface == NULL){

1316

perror("malloc");

1317

free(direntries);

1318

exitcode = EXIT_FAILURE;

1319

goto end;

1320

}

1321

free(direntries);

1322

} else {

1323

free(direntries);

1324

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

1325

exitcode = EXIT_FAILURE;

1326

goto end;

1327

}

1328

}

1329

1128

1330

1129

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

1331

1130

from the signal handler */

1334

1133

mc.simple_poll = avahi_simple_poll_new();

1335

1134

if(mc.simple_poll == NULL){

1336

1135

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

1337

exitcode = EX_UNAVAILABLE;

1136

exitcode = EXIT_FAILURE;

1338

1137

goto end;

1339

1138

}

1340

1139

1342

1141

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

1343

1142

if(ret == -1){

1344

1143

perror("sigaddset");

1345

exitcode = EX_OSERR;

1144

exitcode = EXIT_FAILURE;

1346

1145

goto end;

1347

1146

}

1348

1147

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

1349

1148

if(ret == -1){

1350

1149

perror("sigaddset");

1351

exitcode = EX_OSERR;

1150

exitcode = EXIT_FAILURE;

1352

1151

goto end;

1353

1152

}

1354

1153

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

1355

1154

if(ret == -1){

1356

1155

perror("sigaddset");

1357

exitcode = EX_OSERR;

1156

exitcode = EXIT_FAILURE;

1358

1157

goto end;

1359

1158

}

1360

1159

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

1364

1163

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

1365

1164

if(ret == -1){

1366

1165

perror("sigaction");

1367

return EX_OSERR;

1166

return EXIT_FAILURE;

1368

1167

}

1369

1168

if(old_sigterm_action.sa_handler != SIG_IGN){

1370

1169

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

1371

1170

if(ret == -1){

1372

1171

perror("sigaction");

1373

exitcode = EX_OSERR;

1172

exitcode = EXIT_FAILURE;

1374

1173

goto end;

1375

1174

}

1376

1175

}

1377

1176

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

1378

1177

if(ret == -1){

1379

1178

perror("sigaction");

1380

return EX_OSERR;

1179

return EXIT_FAILURE;

1381

1180

}

1382

1181

if(old_sigterm_action.sa_handler != SIG_IGN){

1383

1182

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

1384

1183

if(ret == -1){

1385

1184

perror("sigaction");

1386

exitcode = EX_OSERR;

1185

exitcode = EXIT_FAILURE;

1387

1186

goto end;

1388

1187

}

1389

1188

}

1390

1189

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

1391

1190

if(ret == -1){

1392

1191

perror("sigaction");

1393

return EX_OSERR;

1192

return EXIT_FAILURE;

1394

1193

}

1395

1194

if(old_sigterm_action.sa_handler != SIG_IGN){

1396

1195

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

1397

1196

if(ret == -1){

1398

1197

perror("sigaction");

1399

exitcode = EX_OSERR;

1198

exitcode = EXIT_FAILURE;

1400

1199

goto end;

1401

1200

}

1402

1201

}

1403

1202

1404

1203

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

1405

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

1204

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

1406

1205

if_index = (AvahiIfIndex) if_nametoindex(interface);

1407

1206

if(if_index == 0){

1408

1207

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

1409

exitcode = EX_UNAVAILABLE;

1208

exitcode = EXIT_FAILURE;

1410

1209

goto end;

1411

1210

}

1412

1211

1423

1222

1424

1223

#ifdef __linux__

1425

1224

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1426

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

1225

messages to mess up the prompt */

1427

1226

ret = klogctl(8, NULL, 5);

1428

1227

bool restore_loglevel = true;

1429

1228

if(ret == -1){

1435

1234

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1436

1235

if(sd < 0){

1437

1236

perror("socket");

1438

exitcode = EX_OSERR;

1237

exitcode = EXIT_FAILURE;

1439

1238

#ifdef __linux__

1440

1239

if(restore_loglevel){

1441

1240

ret = klogctl(7, NULL, 0);

1464

1263

}

1465

1264

}

1466

1265

#endif /* __linux__ */

1467

exitcode = EX_OSERR;

1266

exitcode = EXIT_FAILURE;

1468

1267

/* Lower privileges */

1469

1268

errno = 0;

1470

1269

ret = seteuid(uid);

1479

1278

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

1480

1279

if(ret == -1){

1481

1280

take_down_interface = false;

1482

perror("ioctl SIOCSIFFLAGS +IFF_UP");

1483

exitcode = EX_OSERR;

1281

perror("ioctl SIOCSIFFLAGS");

1282

exitcode = EXIT_FAILURE;

1484

1283

#ifdef __linux__

1485

1284

if(restore_loglevel){

1486

1285

ret = klogctl(7, NULL, 0);

1552

1351

ret = init_gnutls_global(pubkey, seckey);

1553

1352

if(ret == -1){

1554

1353

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

1555

exitcode = EX_UNAVAILABLE;

1354

exitcode = EXIT_FAILURE;

1556

1355

goto end;

1557

1356

} else {

1558

1357

gnutls_initialized = true;

1575

1374

1576

1375

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

1577

1376

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

1578

exitcode = EX_UNAVAILABLE;

1377

exitcode = EXIT_FAILURE;

1579

1378

goto end;

1580

1379

} else {

1581

1380

gpgme_initialized = true;

1591

1390

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

1592

1391

if(address == NULL){

1593

1392

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

1594

exitcode = EX_USAGE;

1393

exitcode = EXIT_FAILURE;

1595

1394

goto end;

1596

1395

}

1597

1396

1605

1404

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

1606

1405

or tmpmax != (uint16_t)tmpmax){

1607

1406

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

1608

exitcode = EX_USAGE;

1407

exitcode = EXIT_FAILURE;

1609

1408

goto end;

1610

1409

}

1611

1410

1627

1426

if(quit_now){

1628

1427

goto end;

1629

1428

}

1630

1631

while(not quit_now){

1632

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

1633

if(quit_now or ret == 0){

1634

break;

1635

}

1636

sleep(15);

1637

};

1638

1639

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 {

1640

1434

exitcode = EXIT_SUCCESS;

1641

1435

}

1642

1643

1436

goto end;

1644

1437

}

1645

1438

1669

1462

if(mc.server == NULL){

1670

1463

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

1671

1464

avahi_strerror(error));

1672

exitcode = EX_UNAVAILABLE;

1465

exitcode = EXIT_FAILURE;

1673

1466

goto end;

1674

1467

}

1675

1468

1684

1477

if(sb == NULL){

1685

1478

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

1686

1479

avahi_strerror(avahi_server_errno(mc.server)));

1687

exitcode = EX_UNAVAILABLE;

1480

exitcode = EXIT_FAILURE;

1688

1481

goto end;

1689

1482

}

1690

1483

1739

1532

if(ret == -1){

1740

1533

perror("ioctl SIOCGIFFLAGS");

1741

1534

} else if(network.ifr_flags & IFF_UP) {

1742

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

1535

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

1743

1536

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

1744

1537

if(ret == -1){

1745

perror("ioctl SIOCSIFFLAGS -IFF_UP");

1538

perror("ioctl SIOCSIFFLAGS");

1746

1539

}

1747

1540

}

1748

1541

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

1805

1598

if(quit_now){

1806

1599

sigemptyset(&old_sigterm_action.sa_mask);

1807

1600

old_sigterm_action.sa_handler = SIG_DFL;

1808

ret = (int)TEMP_FAILURE_RETRY(sigaction(signal_received,

1809

&old_sigterm_action,

1810

NULL));

1601

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

1811

1602

if(ret == -1){

1812

1603

perror("sigaction");

1813

1604

}

1814

do {

1815

ret = raise(signal_received);

1816

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

1817

if(ret != 0){

1818

perror("raise");

1819

abort();

1820

}

1821

TEMP_FAILURE_RETRY(pause());

1605

raise(signal_received);

1822

1606

}

1823

1607

1824

1608

return exitcode;