/mandos/trunk : revision 589.1.1

61

*/

62

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

63

strtoimax() */

64

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

64

65

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

65

66

program_invocation_short_name */

66

67

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

87

88

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

88

89

WEXITSTATUS(), WTERMSIG() */

89

90

#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() */

94

91

95

92

#ifdef __linux__

96

93

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

138

135

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

139

136

char *connect_to = NULL;

140

137

const char *hookdir = HOOKDIR;

141

uid_t uid = 65534;

142

gid_t gid = 65534;

143

138

144

139

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

145

140

typedef struct server{

146

141

const char *ip;

147

in_port_t port;

142

uint16_t port;

148

143

AvahiIfIndex if_index;

149

144

int af;

150

145

struct timespec last_seen;

210

205

}

211

206

212

207

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

213

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

208

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

214

209

int af){

215

210

int ret;

216

211

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

470

465

}

471

466

472

467

static const char * safer_gnutls_strerror(int value){

473

const char *ret = gnutls_strerror(value);

468

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

469

-Wunreachable-code */

474

470

if(ret == NULL)

475

471

ret = "(unknown)";

476

472

return ret;

621

617

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

622

618

623

619

/* Called when a Mandos server is found */

624

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

620

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

625

621

AvahiIfIndex if_index,

626

622

int af){

627

623

int ret, tcp_sd = -1;

666

662

667

663

if(debug){

668

664

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

669

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

665

PRIu16 "\n", ip, port);

670

666

}

671

667

672

668

tcp_sd = socket(pf, SOCK_STREAM, 0);

703

699

goto mandos_end;

704

700

}

705

701

if(af == AF_INET6){

706

to.in6.sin6_port = htons(port);

702

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

703

-Wconversion and

704

-Wunreachable-code */

705

707

706

if(IN6_IS_ADDR_LINKLOCAL /* Spurious warnings from */

708

707

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

709

708

-Wunreachable-code*/

733

732

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

734

733

perror_plus("if_indextoname");

735

734

} else {

736

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

737

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

735

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

736

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

738

737

}

739

738

} else {

740

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

741

ip, (uintmax_t)port);

739

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

740

ip, port);

742

741

}

743

742

char addrstr[(INET_ADDRSTRLEN > INET6_ADDRSTRLEN) ?

744

743

INET_ADDRSTRLEN : INET6_ADDRSTRLEN] = "";

1005

1004

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1005

flags,

1007

1006

AVAHI_GCC_UNUSED void* userdata){

1008

if(r == NULL){

1009

return;

1010

}

1007

assert(r);

1011

1008

1012

1009

/* Called whenever a service has been resolved successfully or

1013

1010

timed out */

1034

1031

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

1035

1032

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

1036

1033

}

1037

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

1038

interface,

1034

int ret = start_mandos_communication(ip, port, interface,

1039

1035

avahi_proto_to_af(proto));

1040

1036

if(ret == 0){

1041

1037

avahi_simple_poll_quit(mc.simple_poll);

1042

1038

} else {

1043

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

1039

if(not add_server(ip, port, interface,

1044

1040

avahi_proto_to_af(proto))){

1045

1041

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

1046

1042

" list\n", name);

1061

1057

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1058

flags,

1063

1059

AVAHI_GCC_UNUSED void* userdata){

1064

if(b == NULL){

1065

return;

1066

}

1060

assert(b);

1067

1061

1068

1062

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

1069

1063

is removed from the LAN */

1125

1119

1126

1120

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

1127

1121

int ret;

1128

error_t ret_errno;

1129

1122

1130

1123

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

1131

1124

if(s < 0){

1132

ret_errno = errno;

1133

1125

perror_plus("socket");

1134

errno = ret_errno;

1135

1126

return false;

1136

1127

}

1137

1128

strcpy(ifr->ifr_name, ifname);

1138

1129

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

1130

if(ret == -1){

1140

1131

if(debug){

1141

ret_errno = errno;

1142

1132

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1144

1133

}

1145

1134

return false;

1146

1135

}

1215

1204

}

1216

1205

1217

1206

/*

1218

* This function determines if a network interface is up.

1219

*/

1220

bool interface_is_up(const char *interface){

1221

struct ifreq ifr;

1222

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

1223

if(debug){

1224

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

1225

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

1226

}

1227

return false;

1228

}

1229

1230

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

1231

}

1232

1233

/*

1234

* This function determines if a network interface is running

1235

*/

1236

bool interface_is_running(const char *interface){

1237

struct ifreq ifr;

1238

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

1239

if(debug){

1240

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

1241

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

1242

}

1243

return false;

1244

}

1245

1246

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

1207

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

1208

* corresponds to an acceptable network device which is up.

1209

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

1210

*/

1211

int up_interface(const struct dirent *if_entry){

1212

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

1213

return 0;

1214

}

1215

1216

struct ifreq ifr;

1217

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

1218

if(debug){

1219

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

1220

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

1221

}

1222

return 0;

1223

}

1224

1225

/* Reject down interfaces */

1226

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

1227

if(debug){

1228

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

1229

if_entry->d_name);

1230

}

1231

return 0;

1232

}

1233

1234

/* Reject non-running interfaces */

1235

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

1236

if(debug){

1237

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

1238

if_entry->d_name);

1239

}

1240

return 0;

1241

}

1242

1243

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

1244

return 0;

1245

}

1246

return 1;

1247

}

1248

1249

int notdotentries(const struct dirent *direntry){

1390

}

1391

}

1392

1393

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

1394

error_t raise_privileges(void){

1395

error_t old_errno = errno;

1396

error_t ret_errno = 0;

1397

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

1398

ret_errno = errno;

1399

perror_plus("seteuid");

1400

}

1401

errno = old_errno;

1402

return ret_errno;

1403

}

1404

1405

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

1406

error_t raise_privileges_permanently(void){

1407

error_t old_errno = errno;

1408

error_t ret_errno = raise_privileges();

1409

if(ret_errno != 0){

1410

errno = old_errno;

1411

return ret_errno;

1412

}

1413

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

1414

ret_errno = errno;

1415

perror_plus("seteuid");

1416

}

1417

errno = old_errno;

1418

return ret_errno;

1419

}

1420

1421

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

1422

error_t lower_privileges(void){

1423

error_t old_errno = errno;

1424

error_t ret_errno = 0;

1425

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

1426

ret_errno = errno;

1427

perror_plus("seteuid");

1428

}

1429

errno = old_errno;

1430

return ret_errno;

1431

}

1432

1433

/* Lower privileges permanently */

1434

error_t lower_privileges_permanently(void){

1435

error_t old_errno = errno;

1436

error_t ret_errno = 0;

1437

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

1438

ret_errno = errno;

1439

perror_plus("setuid");

1440

}

1441

errno = old_errno;

1442

return ret_errno;

1443

}

1444

1445

1393

bool run_network_hooks(const char *mode, const char *interface,

1446

1394

const float delay){

1447

1395

struct dirent **direntries;

1450

1398

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

1451

1399

alphasort);

1452

1400

if(numhooks == -1){

1453

if(errno == ENOENT){

1454

if(debug){

1455

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

1456

" found\n", hookdir);

1457

}

1458

} else {

1459

perror_plus("scandir");

1460

}

1401

perror_plus("scandir");

1461

1402

} else {

1462

1403

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

1463

1404

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

1476

1417

if(hook_pid == 0){

1477

1418

/* Child */

1478

1419

/* Raise privileges */

1479

raise_privileges_permanently();

1420

errno = 0;

1421

ret = seteuid(0);

1422

if(ret == -1){

1423

perror_plus("seteuid");

1424

}

1425

/* Raise privileges even more */

1426

errno = 0;

1427

ret = setuid(0);

1428

if(ret == -1){

1429

perror_plus("setuid");

1430

}

1480

1431

/* Set group */

1481

1432

errno = 0;

1482

1433

ret = setgid(0);

1575

1526

return true;

1576

1527

}

1577

1528

1578

error_t bring_up_interface(const char *const interface,

1579

const float delay){

1580

int sd = -1;

1581

error_t old_errno = errno;

1582

error_t ret_errno = 0;

1583

int ret, ret_setflags;

1584

struct ifreq network;

1585

unsigned int if_index = if_nametoindex(interface);

1586

if(if_index == 0){

1587

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

1588

errno = old_errno;

1589

return ENXIO;

1590

}

1591

1592

if(quit_now){

1593

errno = old_errno;

1594

return EINTR;

1595

}

1596

1597

if(not interface_is_up(interface)){

1598

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

1599

ret_errno = errno;

1600

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

1601

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

1602

return ret_errno;

1603

}

1604

network.ifr_flags |= IFF_UP;

1605

1606

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1607

if(sd < 0){

1608

ret_errno = errno;

1609

perror_plus("socket");

1610

errno = old_errno;

1611

return ret_errno;

1612

}

1613

1614

if(quit_now){

1615

close(sd);

1616

errno = old_errno;

1617

return EINTR;

1618

}

1619

1620

if(debug){

1621

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

1622

interface);

1623

}

1624

1625

/* Raise priviliges */

1626

raise_privileges();

1627

1628

#ifdef __linux__

1629

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1630

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

1631

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

1632

bool restore_loglevel = true;

1633

if(ret_linux == -1){

1634

restore_loglevel = false;

1635

perror_plus("klogctl");

1636

}

1637

#endif /* __linux__ */

1638

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

1639

ret_errno = errno;

1640

#ifdef __linux__

1641

if(restore_loglevel){

1642

ret_linux = klogctl(7, NULL, 0);

1643

if(ret_linux == -1){

1644

perror_plus("klogctl");

1645

}

1646

}

1647

#endif /* __linux__ */

1648

1649

/* Lower privileges */

1650

lower_privileges();

1651

1652

/* Close the socket */

1653

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

1654

if(ret == -1){

1655

perror_plus("close");

1656

}

1657

1658

if(ret_setflags == -1){

1659

errno = ret_errno;

1660

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1661

errno = old_errno;

1662

return ret_errno;

1663

}

1664

} else if(debug){

1665

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

1666

interface);

1667

}

1668

1669

/* Sleep checking until interface is running.

1670

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

1671

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

1672

if(interface_is_running(interface)){

1673

break;

1674

}

1675

struct timespec sleeptime = { .tv_nsec = 250000000 };

1676

ret = nanosleep(&sleeptime, NULL);

1677

if(ret == -1 and errno != EINTR){

1678

perror_plus("nanosleep");

1679

}

1680

}

1681

1682

errno = old_errno;

1683

return 0;

1684

}

1685

1686

error_t take_down_interface(const char *const interface){

1687

int sd = -1;

1688

error_t old_errno = errno;

1689

error_t ret_errno = 0;

1690

int ret, ret_setflags;

1691

struct ifreq network;

1692

unsigned int if_index = if_nametoindex(interface);

1693

if(if_index == 0){

1694

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

1695

errno = old_errno;

1696

return ENXIO;

1697

}

1698

if(interface_is_up(interface)){

1699

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

1700

ret_errno = errno;

1701

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

1702

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

1703

return ret_errno;

1704

}

1705

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

1706

1707

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1708

if(sd < 0){

1709

ret_errno = errno;

1710

perror_plus("socket");

1711

errno = old_errno;

1712

return ret_errno;

1713

}

1714

1715

if(debug){

1716

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

1717

interface);

1718

}

1719

1720

/* Raise priviliges */

1721

raise_privileges();

1722

1723

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

1724

ret_errno = errno;

1725

1726

/* Lower privileges */

1727

lower_privileges();

1728

1729

/* Close the socket */

1730

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

1731

if(ret == -1){

1732

perror_plus("close");

1733

}

1734

1735

if(ret_setflags == -1){

1736

errno = ret_errno;

1737

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1738

errno = old_errno;

1739

return ret_errno;

1740

}

1741

} else if(debug){

1742

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

1743

interface);

1744

}

1745

1746

errno = old_errno;

1747

return 0;

1748

}

1749

1750

1529

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

1751

1530

AvahiSServiceBrowser *sb = NULL;

1752

error_t ret_errno;

1531

int error;

1753

1532

int ret;

1754

1533

intmax_t tmpmax;

1755

1534

char *tmp;

1756

1535

int exitcode = EXIT_SUCCESS;

1757

char *interfaces = NULL;

1758

size_t interfaces_size = 0;

1759

char *interfaces_to_take_down = NULL;

1760

size_t interfaces_to_take_down_size = 0;

1536

const char *interface = "";

1537

struct ifreq network;

1538

int sd = -1;

1539

bool take_down_interface = false;

1540

uid_t uid;

1541

gid_t gid;

1761

1542

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

1762

1543

bool tempdir_created = false;

1763

1544

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1764

1545

const char *seckey = PATHDIR "/" SECKEY;

1765

1546

const char *pubkey = PATHDIR "/" PUBKEY;

1766

char *interfaces_hooks = NULL;

1767

size_t interfaces_hooks_size = 0;

1768

1547

1769

1548

bool gnutls_initialized = false;

1770

1549

bool gpgme_initialized = false;

1861

1640

connect_to = arg;

1862

1641

break;

1863

1642

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

1864

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

1865

(int)',');

1866

if(ret_errno != 0){

1867

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

1868

}

1643

interface = arg;

1869

1644

break;

1870

1645

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

1871

1646

seckey = arg;

1949

1724

<http://bugs.debian.org/633582> */

1950

1725

1951

1726

/* Re-raise priviliges */

1952

if(raise_privileges() == 0){

1727

errno = 0;

1728

ret = seteuid(0);

1729

if(ret == -1){

1730

perror_plus("seteuid");

1731

} else {

1953

1732

struct stat st;

1954

1733

1955

1734

if(strcmp(seckey, PATHDIR "/" SECKEY) == 0){

2003

1782

}

2004

1783

}

2005

1784

2006

/* Remove empty interface names */

2007

{

2008

char *interface = NULL;

2009

while((interface = argz_next(interfaces, interfaces_size,

2010

interface))){

2011

if(if_nametoindex(interface) == 0){

2012

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

2013

fprintf_plus(stderr, "Not using nonexisting interface"

2014

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

2015

}

2016

argz_delete(&interfaces, &interfaces_size, interface);

2017

interface = NULL;

2018

}

2019

}

2020

}

2021

2022

1785

/* Run network hooks */

2023

{

2024

2025

if(interfaces != NULL){

2026

interfaces_hooks = malloc(interfaces_size);

2027

if(interfaces_hooks == NULL){

2028

perror_plus("malloc");

2029

goto end;

2030

}

2031

memcpy(interfaces_hooks, interfaces, interfaces_size);

2032

interfaces_hooks_size = interfaces_size;

2033

argz_stringify(interfaces_hooks, interfaces_hooks_size,

2034

(int)',');

2035

}

2036

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

2037

interfaces_hooks : "", delay)){

2038

goto end;

2039

}

1786

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

1787

goto end;

2040

1788

}

2041

1789

2042

1790

if(not debug){

2043

1791

avahi_set_log_function(empty_log);

2044

1792

}

2045

1793

1794

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

1795

struct dirent **direntries;

1796

/* First look for interfaces that are up */

1797

ret = scandir(sys_class_net, &direntries, up_interface,

1798

alphasort);

1799

if(ret == 0){

1800

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

1801

free(direntries);

1802

ret = scandir(sys_class_net, &direntries, good_interface,

1803

alphasort);

1804

}

1805

if(ret >= 1){

1806

/* Pick the first interface returned */

1807

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

1808

if(debug){

1809

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

1810

}

1811

if(interface == NULL){

1812

perror_plus("malloc");

1813

free(direntries);

1814

exitcode = EXIT_FAILURE;

1815

goto end;

1816

}

1817

free(direntries);

1818

} else {

1819

free(direntries);

1820

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

1821

exitcode = EXIT_FAILURE;

1822

goto end;

1823

}

1824

}

1825

2046

1826

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

2047

1827

from the signal handler */

2048

1828

/* Initialize the pseudo-RNG for Avahi */

2118

1898

}

2119

1899

}

2120

1900

2121

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

2122

if(interfaces == NULL){

2123

struct dirent **direntries;

2124

/* Look for any good interfaces */

2125

ret = scandir(sys_class_net, &direntries, good_interface,

2126

alphasort);

2127

if(ret >= 1){

2128

/* Add all found interfaces to interfaces list */

2129

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

2130

ret_errno = argz_add(&interfaces, &interfaces_size,

2131

direntries[i]->d_name);

2132

if(ret_errno != 0){

2133

perror_plus("argz_add");

2134

continue;

2135

}

2136

if(debug){

2137

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

2138

direntries[i]->d_name);

2139

}

2140

}

2141

free(direntries);

2142

} else {

2143

free(direntries);

2144

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

2145

exitcode = EXIT_FAILURE;

2146

goto end;

2147

}

2148

}

2149

2150

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

2151

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

2152

if(debug){

2153

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

2154

interfaces);

2155

}

2156

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2157

}

2158

2159

/* Bring up interfaces which are down */

2160

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

2161

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

2162

char *interface = NULL;

2163

while((interface = argz_next(interfaces, interfaces_size,

2164

interface))){

2165

bool interface_was_up = interface_is_up(interface);

2166

ret = bring_up_interface(interface, delay);

2167

if(not interface_was_up){

2168

if(ret != 0){

2169

errno = ret;

2170

perror_plus("Failed to bring up interface");

2171

} else {

2172

ret_errno = argz_add(&interfaces_to_take_down,

2173

&interfaces_to_take_down_size,

2174

interface);

2175

}

2176

}

2177

}

2178

free(interfaces);

2179

interfaces = NULL;

2180

interfaces_size = 0;

2181

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

2182

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

1901

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

1902

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

1903

if_index = (AvahiIfIndex) if_nametoindex(interface);

1904

if(if_index == 0){

1905

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

1906

exitcode = EX_UNAVAILABLE;

1907

goto end;

1908

}

1909

1910

if(quit_now){

1911

goto end;

1912

}

1913

1914

/* Re-raise priviliges */

1915

errno = 0;

1916

ret = seteuid(0);

1917

if(ret == -1){

1918

perror_plus("seteuid");

1919

}

1920

1921

#ifdef __linux__

1922

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1923

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

1924

ret = klogctl(8, NULL, 5);

1925

bool restore_loglevel = true;

1926

if(ret == -1){

1927

restore_loglevel = false;

1928

perror_plus("klogctl");

1929

}

1930

#endif /* __linux__ */

1931

1932

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1933

if(sd < 0){

1934

perror_plus("socket");

1935

exitcode = EX_OSERR;

1936

#ifdef __linux__

1937

if(restore_loglevel){

1938

ret = klogctl(7, NULL, 0);

1939

if(ret == -1){

1940

perror_plus("klogctl");

1941

}

1942

}

1943

#endif /* __linux__ */

1944

/* Lower privileges */

1945

errno = 0;

1946

ret = seteuid(uid);

1947

if(ret == -1){

1948

perror_plus("seteuid");

1949

}

1950

goto end;

1951

}

1952

strcpy(network.ifr_name, interface);

1953

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

1954

if(ret == -1){

1955

perror_plus("ioctl SIOCGIFFLAGS");

1956

#ifdef __linux__

1957

if(restore_loglevel){

1958

ret = klogctl(7, NULL, 0);

1959

if(ret == -1){

1960

perror_plus("klogctl");

1961

}

1962

}

1963

#endif /* __linux__ */

1964

exitcode = EX_OSERR;

1965

/* Lower privileges */

1966

errno = 0;

1967

ret = seteuid(uid);

1968

if(ret == -1){

1969

perror_plus("seteuid");

1970

}

1971

goto end;

1972

}

1973

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

1974

network.ifr_flags |= IFF_UP;

1975

take_down_interface = true;

1976

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

1977

if(ret == -1){

1978

take_down_interface = false;

1979

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1980

exitcode = EX_OSERR;

1981

#ifdef __linux__

1982

if(restore_loglevel){

1983

ret = klogctl(7, NULL, 0);

1984

if(ret == -1){

1985

perror_plus("klogctl");

1986

}

1987

}

1988

#endif /* __linux__ */

1989

/* Lower privileges */

1990

errno = 0;

1991

ret = seteuid(uid);

1992

if(ret == -1){

1993

perror_plus("seteuid");

1994

}

1995

goto end;

1996

}

1997

}

1998

/* Sleep checking until interface is running.

1999

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

2000

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

2001

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

2002

if(ret == -1){

2003

perror_plus("ioctl SIOCGIFFLAGS");

2004

} else if(network.ifr_flags & IFF_RUNNING){

2005

break;

2006

}

2007

struct timespec sleeptime = { .tv_nsec = 250000000 };

2008

ret = nanosleep(&sleeptime, NULL);

2009

if(ret == -1 and errno != EINTR){

2010

perror_plus("nanosleep");

2011

}

2012

}

2013

if(not take_down_interface){

2014

/* We won't need the socket anymore */

2015

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

2016

if(ret == -1){

2017

perror_plus("close");

2018

}

2019

}

2020

#ifdef __linux__

2021

if(restore_loglevel){

2022

/* Restores kernel loglevel to default */

2023

ret = klogctl(7, NULL, 0);

2024

if(ret == -1){

2025

perror_plus("klogctl");

2026

}

2027

}

2028

#endif /* __linux__ */

2029

/* Lower privileges */

2030

errno = 0;

2031

/* Lower privileges */

2032

ret = seteuid(uid);

2033

if(ret == -1){

2034

perror_plus("seteuid");

2183

2035

}

2184

2036

}

2185

2037

2226

2078

/* Connect directly, do not use Zeroconf */

2227

2079

/* (Mainly meant for debugging) */

2228

2080

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

2229

2230

2081

if(address == NULL){

2231

2082

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

2232

2083

exitcode = EX_USAGE;

2237

2088

goto end;

2238

2089

}

2239

2090

2240

in_port_t port;

2091

uint16_t port;

2241

2092

errno = 0;

2242

2093

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

2243

2094

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

2244

or tmpmax != (in_port_t)tmpmax){

2095

or tmpmax != (uint16_t)tmpmax){

2245

2096

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

2246

2097

exitcode = EX_USAGE;

2247

2098

goto end;

2251

2102

goto end;

2252

2103

}

2253

2104

2254

port = (in_port_t)tmpmax;

2105

port = (uint16_t)tmpmax;

2255

2106

*address = '\0';

2256

2107

/* Colon in address indicates IPv6 */

2257

2108

int af;

2307

2158

/* Allocate a new server */

2308

2159

mc.server = avahi_server_new(avahi_simple_poll_get

2309

2160

(mc.simple_poll), &config, NULL,

2310

NULL, &ret_errno);

2161

NULL, &error);

2311

2162

2312

2163

/* Free the Avahi configuration data */

2313

2164

avahi_server_config_free(&config);

2316

2167

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

2317

2168

if(mc.server == NULL){

2318

2169

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

2319

avahi_strerror(ret_errno));

2170

avahi_strerror(error));

2320

2171

exitcode = EX_UNAVAILABLE;

2321

2172

goto end;

2322

2173

}

2390

2241

}

2391

2242

}

2392

2243

2244

/* Run network hooks */

2245

run_network_hooks("stop", interface, delay);

2246

2393

2247

/* Re-raise priviliges */

2394

2248

{

2395

raise_privileges();

2396

2397

/* Run network hooks */

2398

run_network_hooks("stop", interfaces_hooks != NULL ?

2399

interfaces_hooks : "", delay);

2400

2401

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

2402

{

2403

char *interface = NULL;

2404

while((interface=argz_next(interfaces_to_take_down,

2405

interfaces_to_take_down_size,

2406

interface))){

2407

ret_errno = take_down_interface(interface);

2408

if(ret_errno != 0){

2409

errno = ret_errno;

2410

perror_plus("Failed to take down interface");

2249

errno = 0;

2250

ret = seteuid(0);

2251

if(ret == -1){

2252

perror_plus("seteuid");

2253

}

2254

2255

/* Take down the network interface */

2256

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

2257

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

2258

if(ret == -1){

2259

perror_plus("ioctl SIOCGIFFLAGS");

2260

} else if(network.ifr_flags & IFF_UP){

2261

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

2262

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

2263

if(ret == -1){

2264

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2411

2265

}

2412

2266

}

2413

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

2414

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

2415

" down\n");

2267

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

2268

if(ret == -1){

2269

perror_plus("close");

2416

2270

}

2417

2271

}

2418

2419

lower_privileges_permanently();

2420

}

2421

2422

free(interfaces_to_take_down);

2423

free(interfaces_hooks);

2272

}

2273

/* Lower privileges permanently */

2274

errno = 0;

2275

ret = setuid(uid);

2276

if(ret == -1){

2277

perror_plus("setuid");

2278

}

2424

2279

2425

2280

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

2426

2281

if(tempdir_created){