/mandos/release : revision 237.7.149

61

*/

62

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

63

strtoimax() */

64

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

65

64

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

66

65

program_invocation_short_name */

67

66

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

88

87

#include <sys/wait.h> /* waitpid(), WIFEXITED(),

89

88

WEXITSTATUS(), WTERMSIG() */

90

89

#include <grp.h> /* setgroups() */

90

#include <argz.h> /* argz_add_sep(), argz_next(),

91

argz_delete(), argz_append(),

92

argz_stringify(), argz_add(),

93

argz_count() */

91

94

92

95

#ifdef __linux__

93

96

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

141

144

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

142

145

typedef struct server{

143

146

const char *ip;

144

uint16_t port;

147

in_port_t port;

145

148

AvahiIfIndex if_index;

146

149

int af;

147

150

struct timespec last_seen;

151

154

152

155

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

153

156

typedef struct {

154

AvahiSimplePoll *simple_poll;

155

157

AvahiServer *server;

156

158

gnutls_certificate_credentials_t cred;

157

159

unsigned int dh_bits;

161

163

server *current_server;

162

164

} mandos_context;

163

165

164

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

165

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

166

.dh_bits = 1024, .priority = "SECURE256"

167

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

168

.current_server = NULL };

166

/* global so signal handler can reach it*/

167

AvahiSimplePoll *simple_poll;

168

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

169

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

170

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

169

171

170

172

sig_atomic_t quit_now = 0;

171

173

int signal_received = 0;

207

209

}

208

210

209

211

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

210

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

212

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

211

213

int af){

212

214

int ret;

213

215

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

251

253

gpgme_error_t rc;

252

254

gpgme_engine_info_t engine_info;

253

255

254

255

256

/*

256

257

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

257

258

*/

467

468

}

468

469

470

static const char * safer_gnutls_strerror(int value){

470

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

471

-Wunreachable-code */

471

const char *ret = gnutls_strerror(value);

472

if(ret == NULL)

473

ret = "(unknown)";

474

return ret;

619

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

620

621

/* Called when a Mandos server is found */

622

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

622

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

623

AvahiIfIndex if_index,

624

int af){

625

int ret, tcp_sd = -1;

664

665

if(debug){

666

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

667

PRIu16 "\n", ip, port);

667

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

668

}

669

670

tcp_sd = socket(pf, SOCK_STREAM, 0);

701

goto mandos_end;

702

}

703

if(af == AF_INET6){

704

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

705

-Wconversion and

706

-Wunreachable-code */

707

704

to.in6.sin6_port = htons(port);

708

705

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

709

706

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

710

707

-Wunreachable-code*/

734

731

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

735

732

perror_plus("if_indextoname");

736

733

} else {

737

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

738

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

734

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

735

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

739

736

}

740

737

} else {

741

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

742

ip, port);

738

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

739

ip, (uintmax_t)port);

743

740

}

744

741

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

745

742

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1006

1003

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1007

1004

flags,

1008

1005

AVAHI_GCC_UNUSED void* userdata){

1009

assert(r);

1006

if(r == NULL){

1007

return;

1008

}

1010

1009

1011

1010

/* Called whenever a service has been resolved successfully or

1012

1011

timed out */

1033

1032

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

1034

1033

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

1035

1034

}

1036

int ret = start_mandos_communication(ip, port, interface,

1035

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

1036

interface,

1037

avahi_proto_to_af(proto));

1038

if(ret == 0){

1039

avahi_simple_poll_quit(mc.simple_poll);

1039

avahi_simple_poll_quit(simple_poll);

1040

} else {

1041

if(not add_server(ip, port, interface,

1041

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

1042

avahi_proto_to_af(proto))){

1043

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

1044

" list\n", name);

1059

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1060

flags,

1061

AVAHI_GCC_UNUSED void* userdata){

1062

assert(b);

1062

if(b == NULL){

1063

return;

1064

}

1063

1065

1064

1066

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

1065

1067

is removed from the LAN */

1074

1076

1075

1077

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

1076

1078

avahi_strerror(avahi_server_errno(mc.server)));

1077

avahi_simple_poll_quit(mc.simple_poll);

1079

avahi_simple_poll_quit(simple_poll);

1078

1080

return;

1079

1081

1080

1082

case AVAHI_BROWSER_NEW:

1113

1115

signal_received = sig;

1114

1116

int old_errno = errno;

1115

1117

/* set main loop to exit */

1116

if(mc.simple_poll != NULL){

1117

avahi_simple_poll_quit(mc.simple_poll);

1118

if(simple_poll != NULL){

1119

avahi_simple_poll_quit(simple_poll);

1118

1120

}

1119

1121

errno = old_errno;

1120

1122

}

1121

1123

1122

1124

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

1123

1125

int ret;

1126

error_t ret_errno;

1124

1127

1125

1128

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

1126

1129

if(s < 0){

1130

ret_errno = errno;

1127

1131

perror_plus("socket");

1132

errno = ret_errno;

1128

1133

return false;

1129

1134

}

1130

1135

strcpy(ifr->ifr_name, ifname);

1131

1136

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1132

1137

if(ret == -1){

1133

1138

if(debug){

1139

ret_errno = errno;

1134

1140

perror_plus("ioctl SIOCGIFFLAGS");

1141

errno = ret_errno;

1135

1142

}

1136

1143

return false;

1137

1144

}

1206

1213

}

1207

1214

1208

1215

/*

1209

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

1210

* corresponds to an acceptable network device which is up.

1211

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

1212

*/

1213

int up_interface(const struct dirent *if_entry){

1214

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

1215

return 0;

1216

}

1217

1218

struct ifreq ifr;

1219

if(not get_flags(if_entry->d_name, &ifr)){

1220

if(debug){

1221

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

1222

"\"%s\"\n", if_entry->d_name);

1223

}

1224

return 0;

1225

}

1226

1227

/* Reject down interfaces */

1228

if(not (ifr.ifr_flags & IFF_UP)){

1229

if(debug){

1230

fprintf_plus(stderr, "Rejecting down interface \"%s\"\n",

1231

if_entry->d_name);

1232

}

1233

return 0;

1234

}

1235

1236

/* Reject non-running interfaces */

1237

if(not (ifr.ifr_flags & IFF_RUNNING)){

1238

if(debug){

1239

fprintf_plus(stderr, "Rejecting non-running interface \"%s\"\n",

1240

if_entry->d_name);

1241

}

1242

return 0;

1243

}

1244

1245

if(not good_flags(if_entry->d_name, &ifr)){

1246

return 0;

1247

}

1248

return 1;

1216

* This function determines if a network interface is up.

1217

*/

1218

bool interface_is_up(const char *interface){

1219

struct ifreq ifr;

1220

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

1221

if(debug){

1222

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

1223

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

1224

}

1225

return false;

1226

}

1227

1228

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

1229

}

1230

1231

/*

1232

* This function determines if a network interface is running

1233

*/

1234

bool interface_is_running(const char *interface){

1235

struct ifreq ifr;

1236

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

1237

if(debug){

1238

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

1239

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

1240

}

1241

return false;

1242

}

1243

1244

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

1249

1245

}

1250

1246

1251

1247

int notdotentries(const struct dirent *direntry){

1368

1364

mc.current_server->if_index,

1369

1365

mc.current_server->af);

1370

1366

if(ret == 0){

1371

avahi_simple_poll_quit(mc.simple_poll);

1367

avahi_simple_poll_quit(simple_poll);

1372

1368

return 0;

1373

1369

}

1374

1370

ret = clock_gettime(CLOCK_MONOTONIC,

1393

1389

}

1394

1390

1395

1391

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

1396

int raise_privileges(void){

1397

int old_errno = errno;

1398

int ret_errno = 0;

1399

errno = 0;

1392

error_t raise_privileges(void){

1393

error_t old_errno = errno;

1394

error_t ret_errno = 0;

1400

1395

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

1396

ret_errno = errno;

1401

1397

perror_plus("seteuid");

1402

1398

}

1403

ret_errno = errno;

1404

1399

errno = old_errno;

1405

1400

return ret_errno;

1406

1401

}

1407

1402

1408

1403

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

1409

int raise_privileges_permanently(void){

1410

int old_errno = errno;

1411

int ret_errno = raise_privileges();

1404

error_t raise_privileges_permanently(void){

1405

error_t old_errno = errno;

1406

error_t ret_errno = raise_privileges();

1412

1407

if(ret_errno != 0){

1413

1408

errno = old_errno;

1414

1409

return ret_errno;

1415

1410

}

1416

errno = 0;

1417

1411

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

1412

ret_errno = errno;

1418

1413

perror_plus("seteuid");

1419

1414

}

1420

ret_errno = errno;

1421

1415

errno = old_errno;

1422

1416

return ret_errno;

1423

1417

}

1424

1418

1425

1419

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

1426

int lower_privileges(void){

1427

int old_errno = errno;

1428

int ret_errno = 0;

1429

errno = 0;

1420

error_t lower_privileges(void){

1421

error_t old_errno = errno;

1422

error_t ret_errno = 0;

1430

1423

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

1424

ret_errno = errno;

1431

1425

perror_plus("seteuid");

1432

1426

}

1433

ret_errno = errno;

1427

errno = old_errno;

1428

return ret_errno;

1429

}

1430

1431

/* Lower privileges permanently */

1432

error_t lower_privileges_permanently(void){

1433

error_t old_errno = errno;

1434

error_t ret_errno = 0;

1435

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

1436

ret_errno = errno;

1437

perror_plus("setuid");

1438

}

1434

1439

errno = old_errno;

1435

1440

return ret_errno;

1436

1441

}

1443

1448

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

1444

1449

alphasort);

1445

1450

if(numhooks == -1){

1446

perror_plus("scandir");

1451

if(errno == ENOENT){

1452

if(debug){

1453

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

1454

" found\n", hookdir);

1455

}

1456

} else {

1457

perror_plus("scandir");

1458

}

1447

1459

} else {

1448

1460

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

1449

1461

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

1561

1573

return true;

1562

1574

}

1563

1575

1564

int bring_up_interface(const char * const interface, const float delay){

1576

error_t bring_up_interface(const char *const interface,

1577

const float delay){

1565

1578

int sd = -1;

1566

int old_errno = errno;

1567

int ret_errno = 0;

1568

int ret;

1579

error_t old_errno = errno;

1580

error_t ret_errno = 0;

1581

int ret, ret_setflags;

1569

1582

struct ifreq network;

1570

AvahiIfIndex if_index = (AvahiIfIndex)if_nametoindex(interface);

1583

unsigned int if_index = if_nametoindex(interface);

1571

1584

if(if_index == 0){

1572

1585

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

1573

1586

errno = old_errno;

1579

1592

return EINTR;

1580

1593

}

1581

1594

1582

/* Re-raise priviliges */

1583

raise_privileges();

1584

1585

#ifdef __linux__

1586

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1587

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

1588

ret = klogctl(8, NULL, 5);

1589

bool restore_loglevel = true;

1590

if(ret == -1){

1591

restore_loglevel = false;

1592

perror_plus("klogctl");

1593

}

1594

#endif /* __linux__ */

1595

1596

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1597

if(sd < 0){

1598

ret_errno = errno;

1599

perror_plus("socket");

1600

#ifdef __linux__

1601

if(restore_loglevel){

1602

ret = klogctl(7, NULL, 0);

1603

if(ret == -1){

1604

perror_plus("klogctl");

1605

}

1606

}

1607

#endif /* __linux__ */

1608

/* Lower privileges */

1609

lower_privileges();

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

strcpy(network.ifr_name, interface);

1614

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

1615

if(ret == -1){

1616

ret_errno = errno;

1617

perror_plus("ioctl SIOCGIFFLAGS");

1618

#ifdef __linux__

1619

if(restore_loglevel){

1620

ret = klogctl(7, NULL, 0);

1621

if(ret == -1){

1622

perror_plus("klogctl");

1623

}

1624

}

1625

#endif /* __linux__ */

1626

/* Lower privileges */

1627

lower_privileges();

1628

errno = old_errno;

1629

return ret_errno;

1630

}

1631

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

1595

if(not interface_is_up(interface)){

1596

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

1597

ret_errno = errno;

1598

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

1599

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

1600

return ret_errno;

1601

}

1632

1602

network.ifr_flags |= IFF_UP;

1633

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

1603

1604

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1605

if(sd < 0){

1606

ret_errno = errno;

1607

perror_plus("socket");

1608

errno = old_errno;

1609

return ret_errno;

1610

}

1611

1612

if(quit_now){

1613

close(sd);

1614

errno = old_errno;

1615

return EINTR;

1616

}

1617

1618

if(debug){

1619

fprintf_plus(stderr, "Bringing up interface \"%s\"\n",

1620

interface);

1621

}

1622

1623

/* Raise priviliges */

1624

raise_privileges();

1625

1626

#ifdef __linux__

1627

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1628

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

1629

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

1630

bool restore_loglevel = true;

1631

if(ret_linux == -1){

1632

restore_loglevel = false;

1633

perror_plus("klogctl");

1634

}

1635

#endif /* __linux__ */

1636

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

1637

ret_errno = errno;

1638

#ifdef __linux__

1639

if(restore_loglevel){

1640

ret_linux = klogctl(7, NULL, 0);

1641

if(ret_linux == -1){

1642

perror_plus("klogctl");

1643

}

1644

}

1645

#endif /* __linux__ */

1646

1647

/* Lower privileges */

1648

lower_privileges();

1649

1650

/* Close the socket */

1651

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

1634

1652

if(ret == -1){

1635

ret_errno = errno;

1653

perror_plus("close");

1654

}

1655

1656

if(ret_setflags == -1){

1657

errno = ret_errno;

1636

1658

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1637

#ifdef __linux__

1638

if(restore_loglevel){

1639

ret = klogctl(7, NULL, 0);

1640

if(ret == -1){

1641

perror_plus("klogctl");

1642

}

1643

}

1644

#endif /* __linux__ */

1645

/* Lower privileges */

1646

lower_privileges();

1647

1659

errno = old_errno;

1648

1660

return ret_errno;

1649

1661

}

1662

} else if(debug){

1663

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

1664

interface);

1650

1665

}

1666

1651

1667

/* Sleep checking until interface is running.

1652

1668

Check every 0.25s, up to total time of delay */

1653

1669

for(int i=0; i < delay * 4; i++){

1654

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

1655

if(ret == -1){

1656

perror_plus("ioctl SIOCGIFFLAGS");

1657

} else if(network.ifr_flags & IFF_RUNNING){

1670

if(interface_is_running(interface)){

1658

1671

break;

1659

1672

}

1660

1673

struct timespec sleeptime = { .tv_nsec = 250000000 };

1663

1676

perror_plus("nanosleep");

1664

1677

}

1665

1678

}

1666

/* Close the socket */

1667

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

1668

if(ret == -1){

1669

perror_plus("close");

1679

1680

errno = old_errno;

1681

return 0;

1682

}

1683

1684

error_t take_down_interface(const char *const interface){

1685

int sd = -1;

1686

error_t old_errno = errno;

1687

error_t ret_errno = 0;

1688

int ret, ret_setflags;

1689

struct ifreq network;

1690

unsigned int if_index = if_nametoindex(interface);

1691

if(if_index == 0){

1692

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

1693

errno = old_errno;

1694

return ENXIO;

1670

1695

}

1671

#ifdef __linux__

1672

if(restore_loglevel){

1673

/* Restores kernel loglevel to default */

1674

ret = klogctl(7, NULL, 0);

1696

if(interface_is_up(interface)){

1697

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

1698

ret_errno = errno;

1699

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

1700

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

1701

return ret_errno;

1702

}

1703

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

1704

1705

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1706

if(sd < 0){

1707

ret_errno = errno;

1708

perror_plus("socket");

1709

errno = old_errno;

1710

return ret_errno;

1711

}

1712

1713

if(debug){

1714

fprintf_plus(stderr, "Taking down interface \"%s\"\n",

1715

interface);

1716

}

1717

1718

/* Raise priviliges */

1719

raise_privileges();

1720

1721

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

1722

ret_errno = errno;

1723

1724

/* Lower privileges */

1725

lower_privileges();

1726

1727

/* Close the socket */

1728

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

1675

1729

if(ret == -1){

1676

perror_plus("klogctl");

1677

}

1730

perror_plus("close");

1731

}

1732

1733

if(ret_setflags == -1){

1734

errno = ret_errno;

1735

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1736

errno = old_errno;

1737

return ret_errno;

1738

}

1739

} else if(debug){

1740

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

1741

interface);

1678

1742

}

1679

#endif /* __linux__ */

1680

/* Lower privileges */

1681

lower_privileges();

1743

1682

1744

errno = old_errno;

1683

1745

return 0;

1684

1746

}

1685

1747

1686

1748

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

1687

1749

AvahiSServiceBrowser *sb = NULL;

1688

int error;

1750

error_t ret_errno;

1689

1751

int ret;

1690

1752

intmax_t tmpmax;

1691

1753

char *tmp;

1692

1754

int exitcode = EXIT_SUCCESS;

1693

const char *interface = "";

1694

struct ifreq network;

1695

int sd = -1;

1696

bool take_down_interface = false;

1755

char *interfaces = NULL;

1756

size_t interfaces_size = 0;

1757

char *interfaces_to_take_down = NULL;

1758

size_t interfaces_to_take_down_size = 0;

1697

1759

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

1698

1760

bool tempdir_created = false;

1699

1761

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1700

1762

const char *seckey = PATHDIR "/" SECKEY;

1701

1763

const char *pubkey = PATHDIR "/" PUBKEY;

1764

char *interfaces_hooks = NULL;

1765

size_t interfaces_hooks_size = 0;

1702

1766

1703

1767

bool gnutls_initialized = false;

1704

1768

bool gpgme_initialized = false;

1795

1859

connect_to = arg;

1796

1860

break;

1797

1861

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

1798

interface = arg;

1862

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

1863

(int)',');

1864

if(ret_errno != 0){

1865

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

1866

}

1799

1867

break;

1800

1868

case 's': /* --seckey */

1801

1869

seckey = arg;

1933

2001

}

1934

2002

}

1935

2003

2004

/* Remove empty interface names */

2005

{

2006

char *interface = NULL;

2007

while((interface = argz_next(interfaces, interfaces_size,

2008

interface))){

2009

if(if_nametoindex(interface) == 0){

2010

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

2011

fprintf_plus(stderr, "Not using nonexisting interface"

2012

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

2013

}

2014

argz_delete(&interfaces, &interfaces_size, interface);

2015

interface = NULL;

2016

}

2017

}

2018

}

2019

1936

2020

/* Run network hooks */

1937

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

1938

goto end;

2021

{

2022

2023

if(interfaces != NULL){

2024

interfaces_hooks = malloc(interfaces_size);

2025

if(interfaces_hooks == NULL){

2026

perror_plus("malloc");

2027

goto end;

2028

}

2029

memcpy(interfaces_hooks, interfaces, interfaces_size);

2030

interfaces_hooks_size = interfaces_size;

2031

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2032

(int)',');

2033

}

2034

if(not run_network_hooks("start", interfaces_hooks != NULL ?

2035

interfaces_hooks : "", delay)){

2036

goto end;

2037

}

1939

2038

}

1940

2039

1941

2040

if(not debug){

1942

2041

avahi_set_log_function(empty_log);

1943

2042

}

1944

2043

1945

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

1946

struct dirent **direntries;

1947

/* First look for interfaces that are up */

1948

ret = scandir(sys_class_net, &direntries, up_interface,

1949

alphasort);

1950

if(ret == 0){

1951

/* No up interfaces, look for any good interfaces */

1952

free(direntries);

1953

ret = scandir(sys_class_net, &direntries, good_interface,

1954

alphasort);

1955

}

1956

if(ret >= 1){

1957

/* Pick the first interface returned */

1958

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

1959

if(debug){

1960

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

1961

}

1962

if(interface == NULL){

1963

perror_plus("malloc");

1964

free(direntries);

1965

exitcode = EXIT_FAILURE;

1966

goto end;

1967

}

1968

free(direntries);

1969

} else {

1970

free(direntries);

1971

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

1972

exitcode = EXIT_FAILURE;

1973

goto end;

1974

}

1975

}

1976

1977

2044

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

1978

2045

from the signal handler */

1979

2046

/* Initialize the pseudo-RNG for Avahi */

1980

2047

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

1981

mc.simple_poll = avahi_simple_poll_new();

1982

if(mc.simple_poll == NULL){

2048

simple_poll = avahi_simple_poll_new();

2049

if(simple_poll == NULL){

1983

2050

fprintf_plus(stderr,

1984

2051

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

1985

2052

exitcode = EX_UNAVAILABLE;

2049

2116

}

2050

2117

}

2051

2118

2052

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

2053

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

2054

ret = bring_up_interface(interface, delay);

2055

if(ret != 0){

2056

errno = ret;

2057

perror_plus("Failed to bring up interface");

2119

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

2120

if(interfaces == NULL){

2121

struct dirent **direntries;

2122

/* Look for any good interfaces */

2123

ret = scandir(sys_class_net, &direntries, good_interface,

2124

alphasort);

2125

if(ret >= 1){

2126

/* Add all found interfaces to interfaces list */

2127

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

2128

ret_errno = argz_add(&interfaces, &interfaces_size,

2129

direntries[i]->d_name);

2130

if(ret_errno != 0){

2131

perror_plus("argz_add");

2132

continue;

2133

}

2134

if(debug){

2135

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

2136

direntries[i]->d_name);

2137

}

2138

}

2139

free(direntries);

2140

} else {

2141

free(direntries);

2142

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

2143

exitcode = EXIT_FAILURE;

2144

goto end;

2145

}

2146

}

2147

2148

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

2149

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

2150

if(debug){

2151

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

2152

interfaces);

2153

}

2154

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2155

}

2156

2157

/* Bring up interfaces which are down */

2158

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

2159

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

2160

char *interface = NULL;

2161

while((interface = argz_next(interfaces, interfaces_size,

2162

interface))){

2163

bool interface_was_up = interface_is_up(interface);

2164

ret = bring_up_interface(interface, delay);

2165

if(not interface_was_up){

2166

if(ret != 0){

2167

errno = ret;

2168

perror_plus("Failed to bring up interface");

2169

} else {

2170

ret_errno = argz_add(&interfaces_to_take_down,

2171

&interfaces_to_take_down_size,

2172

interface);

2173

}

2174

}

2175

}

2176

free(interfaces);

2177

interfaces = NULL;

2178

interfaces_size = 0;

2179

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

2180

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

2058

2181

}

2059

2182

}

2060

2183

2112

2235

goto end;

2113

2236

}

2114

2237

2115

uint16_t port;

2238

in_port_t port;

2116

2239

errno = 0;

2117

2240

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

2118

2241

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

2119

or tmpmax != (uint16_t)tmpmax){

2242

or tmpmax != (in_port_t)tmpmax){

2120

2243

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

2121

2244

exitcode = EX_USAGE;

2122

2245

goto end;

2126

2249

goto end;

2127

2250

}

2128

2251

2129

port = (uint16_t)tmpmax;

2252

port = (in_port_t)tmpmax;

2130

2253

*address = '\0';

2131

2254

/* Colon in address indicates IPv6 */

2132

2255

int af;

2180

2303

config.publish_domain = 0;

2181

2304

2182

2305

/* Allocate a new server */

2183

mc.server = avahi_server_new(avahi_simple_poll_get

2184

(mc.simple_poll), &config, NULL,

2185

NULL, &error);

2306

mc.server = avahi_server_new(avahi_simple_poll_get(simple_poll),

2307

&config, NULL, NULL, &ret_errno);

2186

2308

2187

2309

/* Free the Avahi configuration data */

2188

2310

avahi_server_config_free(&config);

2191

2313

/* Check if creating the Avahi server object succeeded */

2192

2314

if(mc.server == NULL){

2193

2315

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

2194

avahi_strerror(error));

2316

avahi_strerror(ret_errno));

2195

2317

exitcode = EX_UNAVAILABLE;

2196

2318

goto end;

2197

2319

}

2221

2343

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

2222

2344

}

2223

2345

2224

ret = avahi_loop_with_timeout(mc.simple_poll,

2346

ret = avahi_loop_with_timeout(simple_poll,

2225

2347

(int)(retry_interval * 1000));

2226

2348

if(debug){

2227

2349

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

2241

2363

if(mc.server != NULL)

2242

2364

avahi_server_free(mc.server);

2243

2365

2244

if(mc.simple_poll != NULL)

2245

avahi_simple_poll_free(mc.simple_poll);

2366

if(simple_poll != NULL)

2367

avahi_simple_poll_free(simple_poll);

2246

2368

2247

2369

if(gnutls_initialized){

2248

2370

gnutls_certificate_free_credentials(mc.cred);

2265

2387

}

2266

2388

}

2267

2389

2268

/* Run network hooks */

2269

run_network_hooks("stop", interface, delay);

2270

2271

2390

/* Re-raise priviliges */

2272

2391

{

2273

2392

raise_privileges();

2274

2393

2275

/* Take down the network interface */

2276

if(take_down_interface and geteuid() == 0){

2277

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

2278

if(ret == -1){

2279

perror_plus("ioctl SIOCGIFFLAGS");

2280

} else if(network.ifr_flags & IFF_UP){

2281

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

2282

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

2283

if(ret == -1){

2284

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2394

/* Run network hooks */

2395

run_network_hooks("stop", interfaces_hooks != NULL ?

2396

interfaces_hooks : "", delay);

2397

2398

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

2399

{

2400

char *interface = NULL;

2401

while((interface=argz_next(interfaces_to_take_down,

2402

interfaces_to_take_down_size,

2403

interface))){

2404

ret_errno = take_down_interface(interface);

2405

if(ret_errno != 0){

2406

errno = ret_errno;

2407

perror_plus("Failed to take down interface");

2285

2408

}

2286

2409

}

2287

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

2288

if(ret == -1){

2289

perror_plus("close");

2410

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

2411

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

2412

" down\n");

2290

2413

}

2291

2414

}

2292

}

2293

/* Lower privileges permanently */

2294

errno = 0;

2295

ret = setuid(uid);

2296

if(ret == -1){

2297

perror_plus("setuid");

2298

}

2415

2416

lower_privileges_permanently();

2417

}

2418

2419

free(interfaces_to_take_down);

2420

free(interfaces_hooks);

2299

2421

2300

2422

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

2301

2423

if(tempdir_created){