/mandos/trunk : revision 536

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

41

42

#include <stdio.h> /* fprintf(), stderr, fwrite(),

43

stdout, ferror(), remove() */

44

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

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() */

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] = "";

822

821

goto mandos_end;

823

822

}

824

823

825

/* This casting via intptr_t is to eliminate warning about casting

826

an int to a pointer type. This is exactly how the GnuTLS Guile

827

function "set-session-transport-fd!" does it. */

828

gnutls_transport_set_ptr(session,

829

(gnutls_transport_ptr_t)(intptr_t)tcp_sd);

824

/* Spurious warning from -Wint-to-pointer-cast */

825

gnutls_transport_set_ptr(session, (gnutls_transport_ptr_t) tcp_sd);

830

826

831

827

if(quit_now){

832

828

errno = EINTR;

1005

1001

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1006

1002

flags,

1007

1003

AVAHI_GCC_UNUSED void* userdata){

1008

if(r == NULL){

1009

return;

1010

}

1004

assert(r);

1011

1005

1012

1006

/* Called whenever a service has been resolved successfully or

1013

1007

timed out */

1034

1028

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

1035

1029

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

1036

1030

}

1037

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

1038

interface,

1031

int ret = start_mandos_communication(ip, port, interface,

1039

1032

avahi_proto_to_af(proto));

1040

1033

if(ret == 0){

1041

1034

avahi_simple_poll_quit(mc.simple_poll);

1042

1035

} else {

1043

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

1036

if(not add_server(ip, port, interface,

1044

1037

avahi_proto_to_af(proto))){

1045

1038

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

1046

1039

" list\n", name);

1061

1054

AVAHI_GCC_UNUSED AvahiLookupResultFlags

1062

1055

flags,

1063

1056

AVAHI_GCC_UNUSED void* userdata){

1064

if(b == NULL){

1065

return;

1066

}

1057

assert(b);

1067

1058

1068

1059

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

1069

1060

is removed from the LAN */

1125

1116

1126

1117

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

1127

1118

int ret;

1128

error_t ret_errno;

1129

1119

1130

1120

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

1131

1121

if(s < 0){

1132

ret_errno = errno;

1133

1122

perror_plus("socket");

1134

errno = ret_errno;

1135

1123

return false;

1136

1124

}

1137

1125

strcpy(ifr->ifr_name, ifname);

1138

1126

ret = ioctl(s, SIOCGIFFLAGS, ifr);

1139

1127

if(ret == -1){

1140

1128

if(debug){

1141

ret_errno = errno;

1142

1129

perror_plus("ioctl SIOCGIFFLAGS");

1143

errno = ret_errno;

1144

1130

}

1145

1131

return false;

1146

1132

}

1215

1201

}

1216

1202

1217

1203

/*

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);

1204

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

1205

* corresponds to an acceptable network device which is up.

1206

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

1207

*/

1208

int up_interface(const struct dirent *if_entry){

1209

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

1210

return 0;

1211

}

1212

1213

struct ifreq ifr;

1214

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

1215

if(debug){

1216

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

1217

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

1218

}

1219

return 0;

1220

}

1221

1222

/* Reject down interfaces */

1223

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

1224

if(debug){

1225

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

1226

if_entry->d_name);

1227

}

1228

return 0;

1229

}

1230

1231

/* Reject non-running interfaces */

1232

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

1233

if(debug){

1234

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

1235

if_entry->d_name);

1236

}

1237

return 0;

1238

}

1239

1240

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

1241

return 0;

1242

}

1243

return 1;

1247

1244

}

1248

1245

1249

1246

int notdotentries(const struct dirent *direntry){

1390

1387

}

1391

1388

}

1392

1389

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

1390

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

1446

1391

const float delay){

1447

1392

struct dirent **direntries;

1469

1414

if(hook_pid == 0){

1470

1415

/* Child */

1471

1416

/* Raise privileges */

1472

raise_privileges_permanently();

1417

errno = 0;

1418

ret = seteuid(0);

1419

if(ret == -1){

1420

perror_plus("seteuid");

1421

}

1422

/* Raise privileges even more */

1423

errno = 0;

1424

ret = setuid(0);

1425

if(ret == -1){

1426

perror_plus("setuid");

1427

}

1473

1428

/* Set group */

1474

1429

errno = 0;

1475

1430

ret = setgid(0);

1495

1450

perror_plus("setenv");

1496

1451

_exit(EX_OSERR);

1497

1452

}

1498

ret = setenv("VERBOSITY", debug ? "1" : "0", 1);

1453

ret = setenv("VERBOSE", debug ? "1" : "0", 1);

1499

1454

if(ret == -1){

1500

1455

perror_plus("setenv");

1501

1456

_exit(EX_OSERR);

1518

1473

_exit(EX_OSERR);

1519

1474

}

1520

1475

free(delaystring);

1521

if(connect_to != NULL){

1522

ret = setenv("CONNECT", connect_to, 1);

1523

if(ret == -1){

1524

perror_plus("setenv");

1525

_exit(EX_OSERR);

1526

}

1527

}

1528

1476

if(execl(fullname, direntry->d_name, mode, NULL) == -1){

1529

1477

perror_plus("execl");

1530

1478

_exit(EXIT_FAILURE);

1568

1516

return true;

1569

1517

}

1570

1518

1571

error_t bring_up_interface(const char *const interface,

1572

const float delay){

1573

int sd = -1;

1574

error_t old_errno = errno;

1575

error_t ret_errno = 0;

1576

int ret, ret_setflags;

1577

struct ifreq network;

1578

unsigned int if_index = if_nametoindex(interface);

1579

if(if_index == 0){

1580

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

1581

errno = old_errno;

1582

return ENXIO;

1583

}

1584

1585

if(quit_now){

1586

errno = old_errno;

1587

return EINTR;

1588

}

1589

1590

if(not interface_is_up(interface)){

1591

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

1592

ret_errno = errno;

1593

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

1594

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

1595

return ret_errno;

1596

}

1597

network.ifr_flags |= IFF_UP;

1598

1599

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1600

if(sd < 0){

1601

ret_errno = errno;

1602

perror_plus("socket");

1603

errno = old_errno;

1604

return ret_errno;

1605

}

1606

1607

if(quit_now){

1608

close(sd);

1609

errno = old_errno;

1610

return EINTR;

1611

}

1612

1613

if(debug){

1614

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

1615

interface);

1616

}

1617

1618

/* Raise priviliges */

1619

raise_privileges();

1620

1621

#ifdef __linux__

1622

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1623

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

1624

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

1625

bool restore_loglevel = true;

1626

if(ret_linux == -1){

1627

restore_loglevel = false;

1628

perror_plus("klogctl");

1629

}

1630

#endif /* __linux__ */

1631

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

1632

ret_errno = errno;

1633

#ifdef __linux__

1634

if(restore_loglevel){

1635

ret_linux = klogctl(7, NULL, 0);

1636

if(ret_linux == -1){

1637

perror_plus("klogctl");

1638

}

1639

}

1640

#endif /* __linux__ */

1641

1642

/* Lower privileges */

1643

lower_privileges();

1644

1645

/* Close the socket */

1646

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

1647

if(ret == -1){

1648

perror_plus("close");

1649

}

1650

1651

if(ret_setflags == -1){

1652

errno = ret_errno;

1653

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1654

errno = old_errno;

1655

return ret_errno;

1656

}

1657

} else if(debug){

1658

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

1659

interface);

1660

}

1661

1662

/* Sleep checking until interface is running.

1663

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

1664

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

1665

if(interface_is_running(interface)){

1666

break;

1667

}

1668

struct timespec sleeptime = { .tv_nsec = 250000000 };

1669

ret = nanosleep(&sleeptime, NULL);

1670

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

1671

perror_plus("nanosleep");

1672

}

1673

}

1674

1675

errno = old_errno;

1676

return 0;

1677

}

1678

1679

error_t take_down_interface(const char *const interface){

1680

int sd = -1;

1681

error_t old_errno = errno;

1682

error_t ret_errno = 0;

1683

int ret, ret_setflags;

1684

struct ifreq network;

1685

unsigned int if_index = if_nametoindex(interface);

1686

if(if_index == 0){

1687

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

1688

errno = old_errno;

1689

return ENXIO;

1690

}

1691

if(interface_is_up(interface)){

1692

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

1693

ret_errno = errno;

1694

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

1695

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

1696

return ret_errno;

1697

}

1698

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

1699

1700

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1701

if(sd < 0){

1702

ret_errno = errno;

1703

perror_plus("socket");

1704

errno = old_errno;

1705

return ret_errno;

1706

}

1707

1708

if(debug){

1709

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

1710

interface);

1711

}

1712

1713

/* Raise priviliges */

1714

raise_privileges();

1715

1716

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

1717

ret_errno = errno;

1718

1719

/* Lower privileges */

1720

lower_privileges();

1721

1722

/* Close the socket */

1723

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

1724

if(ret == -1){

1725

perror_plus("close");

1726

}

1727

1728

if(ret_setflags == -1){

1729

errno = ret_errno;

1730

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

1731

errno = old_errno;

1732

return ret_errno;

1733

}

1734

} else if(debug){

1735

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

1736

interface);

1737

}

1738

1739

errno = old_errno;

1740

return 0;

1741

}

1742

1743

1519

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

1744

1520

AvahiSServiceBrowser *sb = NULL;

1745

error_t ret_errno;

1521

int error;

1746

1522

int ret;

1747

1523

intmax_t tmpmax;

1748

1524

char *tmp;

1749

1525

int exitcode = EXIT_SUCCESS;

1750

char *interfaces = NULL;

1751

size_t interfaces_size = 0;

1752

char *interfaces_to_take_down = NULL;

1753

size_t interfaces_to_take_down_size = 0;

1526

const char *interface = "";

1527

struct ifreq network;

1528

int sd = -1;

1529

bool take_down_interface = false;

1530

uid_t uid;

1531

gid_t gid;

1754

1532

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

1755

1533

bool tempdir_created = false;

1756

1534

AvahiIfIndex if_index = AVAHI_IF_UNSPEC;

1757

1535

const char *seckey = PATHDIR "/" SECKEY;

1758

1536

const char *pubkey = PATHDIR "/" PUBKEY;

1759

char *interfaces_hooks = NULL;

1760

size_t interfaces_hooks_size = 0;

1761

1537

1762

1538

bool gnutls_initialized = false;

1763

1539

bool gpgme_initialized = false;

1825

1601

.group = 2 },

1826

1602

{ .name = "retry", .key = 132,

1827

1603

.arg = "SECONDS",

1828

.doc = "Retry interval used when denied by the Mandos server",

1604

.doc = "Retry interval used when denied by the mandos server",

1829

1605

.group = 2 },

1830

1606

{ .name = "network-hook-dir", .key = 133,

1831

1607

.arg = "DIR",

1854

1630

connect_to = arg;

1855

1631

break;

1856

1632

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

1857

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

1858

(int)',');

1859

if(ret_errno != 0){

1860

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

1861

}

1633

interface = arg;

1862

1634

break;

1863

1635

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

1864

1636

seckey = arg;

1942

1714

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

1943

1715

1944

1716

/* Re-raise priviliges */

1945

if(raise_privileges() == 0){

1717

errno = 0;

1718

ret = seteuid(0);

1719

if(ret == -1){

1720

perror_plus("seteuid");

1721

} else {

1946

1722

struct stat st;

1947

1723

1948

1724

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

1996

1772

}

1997

1773

}

1998

1774

1999

/* Remove empty interface names */

2000

{

2001

char *interface = NULL;

2002

while((interface = argz_next(interfaces, interfaces_size,

2003

interface))){

2004

if(if_nametoindex(interface) == 0){

2005

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

2006

fprintf_plus(stderr, "Not using nonexisting interface"

2007

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

2008

}

2009

argz_delete(&interfaces, &interfaces_size, interface);

2010

interface = NULL;

2011

}

2012

}

2013

}

2014

2015

1775

/* Run network hooks */

2016

{

2017

ret_errno = argz_append(&interfaces_hooks, &interfaces_hooks_size,

2018

interfaces, interfaces_size);

2019

if(ret_errno != 0){

2020

errno = ret_errno;

2021

perror_plus("argz_append");

2022

goto end;

2023

}

2024

argz_stringify(interfaces_hooks, interfaces_hooks_size, (int)',');

2025

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

2026

goto end;

2027

}

1776

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

1777

goto end;

2028

1778

}

2029

1779

2030

1780

if(not debug){

2031

1781

avahi_set_log_function(empty_log);

2032

1782

}

2033

1783

1784

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

1785

struct dirent **direntries;

1786

/* First look for interfaces that are up */

1787

ret = scandir(sys_class_net, &direntries, up_interface,

1788

alphasort);

1789

if(ret == 0){

1790

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

1791

free(direntries);

1792

ret = scandir(sys_class_net, &direntries, good_interface,

1793

alphasort);

1794

}

1795

if(ret >= 1){

1796

/* Pick the first interface returned */

1797

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

1798

if(debug){

1799

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

1800

}

1801

if(interface == NULL){

1802

perror_plus("malloc");

1803

free(direntries);

1804

exitcode = EXIT_FAILURE;

1805

goto end;

1806

}

1807

free(direntries);

1808

} else {

1809

free(direntries);

1810

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

1811

exitcode = EXIT_FAILURE;

1812

goto end;

1813

}

1814

}

1815

2034

1816

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

2035

1817

from the signal handler */

2036

1818

/* Initialize the pseudo-RNG for Avahi */

2106

1888

}

2107

1889

}

2108

1890

2109

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

2110

if(interfaces == NULL){

2111

struct dirent **direntries;

2112

/* Look for any good interfaces */

2113

ret = scandir(sys_class_net, &direntries, good_interface,

2114

alphasort);

2115

if(ret >= 1){

2116

/* Add all found interfaces to interfaces list */

2117

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

2118

ret_errno = argz_add(&interfaces, &interfaces_size,

2119

direntries[i]->d_name);

2120

if(ret_errno != 0){

2121

perror_plus("argz_add");

2122

continue;

2123

}

2124

if(debug){

2125

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

2126

direntries[i]->d_name);

2127

}

2128

}

2129

free(direntries);

2130

} else {

2131

free(direntries);

2132

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

2133

exitcode = EXIT_FAILURE;

2134

goto end;

2135

}

2136

}

2137

2138

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

2139

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

2140

if(debug){

2141

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

2142

interfaces);

2143

}

2144

if_index = (AvahiIfIndex)if_nametoindex(interfaces);

2145

}

2146

2147

/* Bring up interfaces which are down */

2148

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

2149

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

2150

char *interface = NULL;

2151

while((interface = argz_next(interfaces, interfaces_size,

2152

interface))){

2153

bool interface_was_up = interface_is_up(interface);

2154

ret = bring_up_interface(interface, delay);

2155

if(not interface_was_up){

2156

if(ret != 0){

2157

errno = ret;

2158

perror_plus("Failed to bring up interface");

2159

} else {

2160

ret_errno = argz_add(&interfaces_to_take_down,

2161

&interfaces_to_take_down_size,

2162

interface);

2163

}

2164

}

2165

}

2166

free(interfaces);

2167

interfaces = NULL;

2168

interfaces_size = 0;

2169

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

2170

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

1891

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

1892

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

1893

if_index = (AvahiIfIndex) if_nametoindex(interface);

1894

if(if_index == 0){

1895

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

1896

exitcode = EX_UNAVAILABLE;

1897

goto end;

1898

}

1899

1900

if(quit_now){

1901

goto end;

1902

}

1903

1904

/* Re-raise priviliges */

1905

errno = 0;

1906

ret = seteuid(0);

1907

if(ret == -1){

1908

perror_plus("seteuid");

1909

}

1910

1911

#ifdef __linux__

1912

/* Lower kernel loglevel to KERN_NOTICE to avoid KERN_INFO

1913

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

1914

ret = klogctl(8, NULL, 5);

1915

bool restore_loglevel = true;

1916

if(ret == -1){

1917

restore_loglevel = false;

1918

perror_plus("klogctl");

1919

}

1920

#endif /* __linux__ */

1921

1922

sd = socket(PF_INET6, SOCK_DGRAM, IPPROTO_IP);

1923

if(sd < 0){

1924

perror_plus("socket");

1925

exitcode = EX_OSERR;

1926

#ifdef __linux__

1927

if(restore_loglevel){

1928

ret = klogctl(7, NULL, 0);

1929

if(ret == -1){

1930

perror_plus("klogctl");

1931

}

1932

}

1933

#endif /* __linux__ */

1934

/* Lower privileges */

1935

errno = 0;

1936

ret = seteuid(uid);

1937

if(ret == -1){

1938

perror_plus("seteuid");

1939

}

1940

goto end;

1941

}

1942

strcpy(network.ifr_name, interface);

1943

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

1944

if(ret == -1){

1945

perror_plus("ioctl SIOCGIFFLAGS");

1946

#ifdef __linux__

1947

if(restore_loglevel){

1948

ret = klogctl(7, NULL, 0);

1949

if(ret == -1){

1950

perror_plus("klogctl");

1951

}

1952

}

1953

#endif /* __linux__ */

1954

exitcode = EX_OSERR;

1955

/* Lower privileges */

1956

errno = 0;

1957

ret = seteuid(uid);

1958

if(ret == -1){

1959

perror_plus("seteuid");

1960

}

1961

goto end;

1962

}

1963

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

1964

network.ifr_flags |= IFF_UP;

1965

take_down_interface = true;

1966

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

1967

if(ret == -1){

1968

take_down_interface = false;

1969

perror_plus("ioctl SIOCSIFFLAGS +IFF_UP");

1970

exitcode = EX_OSERR;

1971

#ifdef __linux__

1972

if(restore_loglevel){

1973

ret = klogctl(7, NULL, 0);

1974

if(ret == -1){

1975

perror_plus("klogctl");

1976

}

1977

}

1978

#endif /* __linux__ */

1979

/* Lower privileges */

1980

errno = 0;

1981

ret = seteuid(uid);

1982

if(ret == -1){

1983

perror_plus("seteuid");

1984

}

1985

goto end;

1986

}

1987

}

1988

/* Sleep checking until interface is running.

1989

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

1990

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

1991

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

1992

if(ret == -1){

1993

perror_plus("ioctl SIOCGIFFLAGS");

1994

} else if(network.ifr_flags & IFF_RUNNING){

1995

break;

1996

}

1997

struct timespec sleeptime = { .tv_nsec = 250000000 };

1998

ret = nanosleep(&sleeptime, NULL);

1999

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

2000

perror_plus("nanosleep");

2001

}

2002

}

2003

if(not take_down_interface){

2004

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

2005

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

2006

if(ret == -1){

2007

perror_plus("close");

2008

}

2009

}

2010

#ifdef __linux__

2011

if(restore_loglevel){

2012

/* Restores kernel loglevel to default */

2013

ret = klogctl(7, NULL, 0);

2014

if(ret == -1){

2015

perror_plus("klogctl");

2016

}

2017

}

2018

#endif /* __linux__ */

2019

/* Lower privileges */

2020

errno = 0;

2021

/* Lower privileges */

2022

ret = seteuid(uid);

2023

if(ret == -1){

2024

perror_plus("seteuid");

2171

2025

}

2172

2026

}

2173

2027

2214

2068

/* Connect directly, do not use Zeroconf */

2215

2069

/* (Mainly meant for debugging) */

2216

2070

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

2217

2218

2071

if(address == NULL){

2219

2072

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

2220

2073

exitcode = EX_USAGE;

2225

2078

goto end;

2226

2079

}

2227

2080

2228

in_port_t port;

2081

uint16_t port;

2229

2082

errno = 0;

2230

2083

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

2231

2084

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

2232

or tmpmax != (in_port_t)tmpmax){

2085

or tmpmax != (uint16_t)tmpmax){

2233

2086

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

2234

2087

exitcode = EX_USAGE;

2235

2088

goto end;

2239

2092

goto end;

2240

2093

}

2241

2094

2242

port = (in_port_t)tmpmax;

2095

port = (uint16_t)tmpmax;

2243

2096

*address = '\0';

2244

2097

/* Colon in address indicates IPv6 */

2245

2098

int af;

2295

2148

/* Allocate a new server */

2296

2149

mc.server = avahi_server_new(avahi_simple_poll_get

2297

2150

(mc.simple_poll), &config, NULL,

2298

NULL, &ret_errno);

2151

NULL, &error);

2299

2152

2300

2153

/* Free the Avahi configuration data */

2301

2154

avahi_server_config_free(&config);

2304

2157

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

2305

2158

if(mc.server == NULL){

2306

2159

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

2307

avahi_strerror(ret_errno));

2160

avahi_strerror(error));

2308

2161

exitcode = EX_UNAVAILABLE;

2309

2162

goto end;

2310

2163

}

2378

2231

}

2379

2232

}

2380

2233

2234

/* Run network hooks */

2235

run_network_hooks("stop", interface, delay);

2236

2381

2237

/* Re-raise priviliges */

2382

2238

{

2383

raise_privileges();

2384

2385

/* Run network hooks */

2386

run_network_hooks("stop", interfaces_hooks, delay);

2387

2388

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

2389

{

2390

char *interface = NULL;

2391

while((interface=argz_next(interfaces_to_take_down,

2392

interfaces_to_take_down_size,

2393

interface))){

2394

ret_errno = take_down_interface(interface);

2395

if(ret_errno != 0){

2396

errno = ret_errno;

2397

perror_plus("Failed to take down interface");

2239

errno = 0;

2240

ret = seteuid(0);

2241

if(ret == -1){

2242

perror_plus("seteuid");

2243

}

2244

2245

/* Take down the network interface */

2246

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

2247

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

2248

if(ret == -1){

2249

perror_plus("ioctl SIOCGIFFLAGS");

2250

} else if(network.ifr_flags & IFF_UP){

2251

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

2252

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

2253

if(ret == -1){

2254

perror_plus("ioctl SIOCSIFFLAGS -IFF_UP");

2398

2255

}

2399

2256

}

2400

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

2401

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

2402

" down\n");

2257

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

2258

if(ret == -1){

2259

perror_plus("close");

2403

2260

}

2404

2261

}

2405

2406

lower_privileges_permanently();

2407

}

2408

2409

free(interfaces_to_take_down);

2410

free(interfaces_hooks);

2262

}

2263

/* Lower privileges permanently */

2264

errno = 0;

2265

ret = setuid(uid);

2266

if(ret == -1){

2267

perror_plus("setuid");

2268

}

2411

2269

2412

2270

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

2413

2271

if(tempdir_created){