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pcg |
1.1 |
/* |
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protocol.C -- handle the protocol, encryption, handshaking etc. |
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This program is free software; you can redistribute it and/or modify |
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it under the terms of the GNU General Public License as published by |
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the Free Software Foundation; either version 2 of the License, or |
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(at your option) any later version. |
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This program is distributed in the hope that it will be useful, |
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but WITHOUT ANY WARRANTY; without even the implied warranty of |
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
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GNU General Public License for more details. |
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You should have received a copy of the GNU General Public License |
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along with this program; if not, write to the Free Software |
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Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
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*/ |
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#include "config.h" |
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1.10 |
#include <list> |
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1.1 |
#include <cstdlib> |
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#include <cstring> |
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#include <cstdio> |
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#include <sys/types.h> |
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#include <sys/socket.h> |
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#include <sys/poll.h> |
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#include <sys/wait.h> |
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#include <netinet/in.h> |
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#include <arpa/inet.h> |
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#include <errno.h> |
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#include <time.h> |
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#include <unistd.h> |
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#include <openssl/rand.h> |
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#include <openssl/hmac.h> |
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#include <openssl/evp.h> |
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#include <openssl/rsa.h> |
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#include <openssl/err.h> |
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extern "C" { |
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# include "lzf/lzf.h" |
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} |
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#include "gettext.h" |
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#include "pidfile.h" |
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#include "conf.h" |
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#include "slog.h" |
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#include "device.h" |
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#include "protocol.h" |
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#if !HAVE_RAND_PSEUDO_BYTES |
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# define RAND_pseudo_bytes RAND_bytes |
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#endif |
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static time_t next_timecheck; |
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#define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
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static const rsachallenge & |
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challenge_bytes () |
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{ |
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static rsachallenge challenge; |
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pcg |
1.9 |
static double challenge_ttl; // time this challenge needs to be recreated |
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|
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if (NOW > challenge_ttl) |
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1.1 |
{ |
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RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
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1.9 |
challenge_ttl = NOW + CHALLENGE_TTL; |
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pcg |
1.1 |
} |
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return challenge; |
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} |
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1.10 |
// caching of rsa operations really helps slow computers |
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struct rsa_entry { |
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tstamp expire; |
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rsachallenge chg; |
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RSA *key; // which key |
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rsaencrdata encr; |
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rsa_entry () |
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{ |
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expire = NOW + CHALLENGE_TTL; |
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} |
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}; |
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struct rsa_cache : list<rsa_entry> |
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{ |
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void cleaner_cb (tstamp &ts); time_watcher cleaner; |
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const rsaencrdata *public_encrypt (RSA *key, const rsachallenge &chg) |
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{ |
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for (iterator i = begin (); i != end (); ++i) |
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{ |
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if (i->key == key && !memcmp (&chg, &i->chg, sizeof chg)) |
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return &i->encr; |
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} |
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if (cleaner.at < NOW) |
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cleaner.start (NOW + CHALLENGE_TTL); |
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resize (size () + 1); |
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rsa_entry *e = &(*rbegin ()); |
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e->key = key; |
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memcpy (&e->chg, &chg, sizeof chg); |
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if (0 > RSA_public_encrypt (sizeof chg, |
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(unsigned char *)&chg, (unsigned char *)&e->encr, |
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key, RSA_PKCS1_OAEP_PADDING)) |
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fatal ("RSA_public_encrypt error"); |
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return &e->encr; |
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} |
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const rsachallenge *private_decrypt (RSA *key, const rsaencrdata &encr) |
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{ |
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for (iterator i = begin (); i != end (); ++i) |
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if (i->key == key && !memcmp (&encr, &i->encr, sizeof encr)) |
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return &i->chg; |
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if (cleaner.at < NOW) |
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cleaner.start (NOW + CHALLENGE_TTL); |
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resize (size () + 1); |
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rsa_entry *e = &(*rbegin ()); |
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e->key = key; |
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memcpy (&e->encr, &encr, sizeof encr); |
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if (0 > RSA_private_decrypt (sizeof encr, |
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(unsigned char *)&encr, (unsigned char *)&e->chg, |
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key, RSA_PKCS1_OAEP_PADDING)) |
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{ |
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pop_back (); |
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return 0; |
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} |
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return &e->chg; |
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} |
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rsa_cache () |
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: cleaner (this, &rsa_cache::cleaner_cb) |
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{ } |
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} rsa_cache; |
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void rsa_cache::cleaner_cb (tstamp &ts) |
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{ |
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if (empty ()) |
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ts = TSTAMP_CANCEL; |
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else |
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{ |
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ts = NOW + 3; |
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for (iterator i = begin (); i != end (); ) |
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{ |
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if (i->expire >= NOW) |
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i = erase (i); |
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else |
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++i; |
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} |
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} |
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} |
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pcg |
1.1 |
// run a script. yes, it's a template function. yes, c++ |
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// is not a functional language. yes, this suxx. |
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template<class owner> |
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static void |
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run_script (owner *obj, const char *(owner::*setup)(), bool wait) |
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{ |
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int pid; |
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if ((pid = fork ()) == 0) |
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{ |
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char *filename; |
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asprintf (&filename, "%s/%s", confbase, (obj->*setup) ()); |
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execl (filename, filename, (char *) 0); |
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exit (255); |
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} |
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else if (pid > 0) |
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{ |
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if (wait) |
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{ |
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waitpid (pid, 0, 0); |
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/* TODO: check status */ |
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} |
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} |
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} |
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// xor the socket address into the challenge to ensure different challenges |
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// per host. we could rely on the OAEP padding, but this doesn't hurt. |
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void |
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xor_sa (rsachallenge &k, SOCKADDR *sa) |
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{ |
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((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port; |
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((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port; |
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} |
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struct crypto_ctx |
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{ |
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EVP_CIPHER_CTX cctx; |
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HMAC_CTX hctx; |
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pcg |
1.10 |
crypto_ctx (const rsachallenge &challenge, int enc); |
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pcg |
1.1 |
~crypto_ctx (); |
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}; |
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pcg |
1.10 |
crypto_ctx::crypto_ctx (const rsachallenge &challenge, int enc) |
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pcg |
1.1 |
{ |
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EVP_CIPHER_CTX_init (&cctx); |
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EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
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HMAC_CTX_init (&hctx); |
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HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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} |
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crypto_ctx::~crypto_ctx () |
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{ |
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EVP_CIPHER_CTX_cleanup (&cctx); |
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HMAC_CTX_cleanup (&hctx); |
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} |
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pcg |
1.9 |
////////////////////////////////////////////////////////////////////////////// |
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void pkt_queue::put (tap_packet *p) |
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{ |
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if (queue[i]) |
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{ |
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delete queue[i]; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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queue[i] = p; |
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i = (i + 1) % QUEUEDEPTH; |
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} |
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tap_packet *pkt_queue::get () |
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{ |
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tap_packet *p = queue[j]; |
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if (p) |
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{ |
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queue[j] = 0; |
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j = (j + 1) % QUEUEDEPTH; |
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} |
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return p; |
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} |
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pkt_queue::pkt_queue () |
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{ |
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memset (queue, 0, sizeof (queue)); |
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i = 0; |
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j = 0; |
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} |
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pkt_queue::~pkt_queue () |
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{ |
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for (i = QUEUEDEPTH; --i > 0; ) |
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delete queue[i]; |
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} |
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// only do action once every x seconds per host. |
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// currently this is quite a slow implementation, |
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// but suffices for normal operation. |
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struct u32_rate_limiter : private map<u32, tstamp> |
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{ |
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tstamp every; |
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bool can (u32 host); |
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u32_rate_limiter (tstamp every = 1) |
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{ |
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this->every = every; |
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} |
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}; |
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struct net_rate_limiter : u32_rate_limiter |
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{ |
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bool can (SOCKADDR *sa) { return u32_rate_limiter::can((u32)sa->sin_addr.s_addr); } |
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bool can (sockinfo &si) { return u32_rate_limiter::can((u32)si.host); } |
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net_rate_limiter (tstamp every) : u32_rate_limiter (every) {} |
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}; |
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bool u32_rate_limiter::can (u32 host) |
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{ |
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iterator i; |
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for (i = begin (); i != end (); ) |
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if (i->second <= NOW) |
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{ |
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erase (i); |
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i = begin (); |
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} |
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else |
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++i; |
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i = find (host); |
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if (i != end ()) |
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return false; |
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insert (value_type (host, NOW + every)); |
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return true; |
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} |
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315 |
pcg |
1.1 |
///////////////////////////////////////////////////////////////////////////// |
316 |
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317 |
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static void next_wakeup (time_t next) |
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{ |
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if (next_timecheck > next) |
320 |
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next_timecheck = next; |
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} |
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static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
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struct hmac_packet:net_packet |
326 |
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{ |
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u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
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329 |
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void hmac_set (crypto_ctx * ctx); |
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bool hmac_chk (crypto_ctx * ctx); |
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private: |
333 |
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void hmac_gen (crypto_ctx * ctx) |
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{ |
335 |
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unsigned int xlen; |
336 |
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HMAC_CTX *hctx = &ctx->hctx; |
337 |
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338 |
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HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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len - sizeof (hmac_packet)); |
341 |
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HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
342 |
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} |
343 |
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}; |
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345 |
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void |
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hmac_packet::hmac_set (crypto_ctx * ctx) |
347 |
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{ |
348 |
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hmac_gen (ctx); |
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350 |
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memcpy (hmac, hmac_digest, HMACLENGTH); |
351 |
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} |
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353 |
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bool |
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hmac_packet::hmac_chk (crypto_ctx * ctx) |
355 |
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{ |
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hmac_gen (ctx); |
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return !memcmp (hmac, hmac_digest, HMACLENGTH); |
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} |
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struct vpn_packet : hmac_packet |
362 |
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{ |
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enum ptype |
364 |
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{ |
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PT_RESET = 0, |
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PT_DATA_UNCOMPRESSED, |
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PT_DATA_COMPRESSED, |
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PT_PING, PT_PONG, // wasting namespace space? ;) |
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PT_AUTH, // authentification |
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PT_CONNECT_REQ, // want other host to contact me |
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PT_CONNECT_INFO, // request connection to some node |
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PT_REKEY, // rekeying (not yet implemented) |
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PT_MAX |
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}; |
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u8 type; |
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u8 srcdst, src1, dst1; |
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379 |
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void set_hdr (ptype type, unsigned int dst); |
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381 |
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unsigned int src () |
382 |
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{ |
383 |
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return src1 | ((srcdst >> 4) << 8); |
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} |
385 |
pcg |
1.9 |
|
386 |
pcg |
1.1 |
unsigned int dst () |
387 |
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{ |
388 |
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return dst1 | ((srcdst & 0xf) << 8); |
389 |
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} |
390 |
pcg |
1.9 |
|
391 |
pcg |
1.1 |
ptype typ () |
392 |
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{ |
393 |
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return (ptype) type; |
394 |
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} |
395 |
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}; |
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397 |
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void vpn_packet::set_hdr (ptype type, unsigned int dst) |
398 |
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{ |
399 |
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this->type = type; |
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|
401 |
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int src = THISNODE->id; |
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403 |
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src1 = src; |
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srcdst = ((src >> 8) << 4) | (dst >> 8); |
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dst1 = dst; |
406 |
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} |
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408 |
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#define MAXVPNDATA (MAX_MTU - 6 - 6) |
409 |
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#define DATAHDR (sizeof (u32) + RAND_SIZE) |
410 |
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|
411 |
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struct vpndata_packet:vpn_packet |
412 |
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{ |
413 |
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u8 data[MAXVPNDATA + DATAHDR]; // seqno |
414 |
|
|
|
415 |
|
|
void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
416 |
|
|
tap_packet *unpack (connection *conn, u32 &seqno); |
417 |
|
|
private: |
418 |
|
|
|
419 |
|
|
const u32 data_hdr_size () const |
420 |
|
|
{ |
421 |
|
|
return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
422 |
|
|
} |
423 |
|
|
}; |
424 |
|
|
|
425 |
|
|
void |
426 |
|
|
vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
427 |
|
|
{ |
428 |
|
|
EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
429 |
|
|
int outl = 0, outl2; |
430 |
|
|
ptype type = PT_DATA_UNCOMPRESSED; |
431 |
|
|
|
432 |
|
|
#if ENABLE_COMPRESSION |
433 |
|
|
u8 cdata[MAX_MTU]; |
434 |
|
|
u32 cl; |
435 |
|
|
|
436 |
|
|
cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
437 |
|
|
if (cl) |
438 |
|
|
{ |
439 |
|
|
type = PT_DATA_COMPRESSED; |
440 |
|
|
d = cdata; |
441 |
|
|
l = cl + 2; |
442 |
|
|
|
443 |
|
|
d[0] = cl >> 8; |
444 |
|
|
d[1] = cl; |
445 |
|
|
} |
446 |
|
|
#endif |
447 |
|
|
|
448 |
|
|
EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
449 |
|
|
|
450 |
pcg |
1.13 |
struct { |
451 |
pcg |
1.1 |
#if RAND_SIZE |
452 |
|
|
u8 rnd[RAND_SIZE]; |
453 |
pcg |
1.13 |
#endif |
454 |
pcg |
1.1 |
u32 seqno; |
455 |
|
|
} datahdr; |
456 |
|
|
|
457 |
pcg |
1.12 |
datahdr.seqno = ntohl (seqno); |
458 |
pcg |
1.13 |
#if RAND_SIZE |
459 |
pcg |
1.1 |
RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
460 |
pcg |
1.13 |
#endif |
461 |
pcg |
1.1 |
|
462 |
|
|
EVP_EncryptUpdate (cctx, |
463 |
|
|
(unsigned char *) data + outl, &outl2, |
464 |
|
|
(unsigned char *) &datahdr, DATAHDR); |
465 |
|
|
outl += outl2; |
466 |
|
|
|
467 |
|
|
EVP_EncryptUpdate (cctx, |
468 |
|
|
(unsigned char *) data + outl, &outl2, |
469 |
|
|
(unsigned char *) d, l); |
470 |
|
|
outl += outl2; |
471 |
|
|
|
472 |
|
|
EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
473 |
|
|
outl += outl2; |
474 |
|
|
|
475 |
|
|
len = outl + data_hdr_size (); |
476 |
|
|
|
477 |
|
|
set_hdr (type, dst); |
478 |
|
|
|
479 |
|
|
hmac_set (conn->octx); |
480 |
|
|
} |
481 |
|
|
|
482 |
|
|
tap_packet * |
483 |
|
|
vpndata_packet::unpack (connection *conn, u32 &seqno) |
484 |
|
|
{ |
485 |
|
|
EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
486 |
|
|
int outl = 0, outl2; |
487 |
|
|
tap_packet *p = new tap_packet; |
488 |
|
|
u8 *d; |
489 |
|
|
u32 l = len - data_hdr_size (); |
490 |
|
|
|
491 |
|
|
EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
492 |
|
|
|
493 |
|
|
#if ENABLE_COMPRESSION |
494 |
|
|
u8 cdata[MAX_MTU]; |
495 |
|
|
|
496 |
|
|
if (type == PT_DATA_COMPRESSED) |
497 |
|
|
d = cdata; |
498 |
|
|
else |
499 |
|
|
#endif |
500 |
|
|
d = &(*p)[6 + 6 - DATAHDR]; |
501 |
|
|
|
502 |
|
|
/* this overwrites part of the src mac, but we fix that later */ |
503 |
|
|
EVP_DecryptUpdate (cctx, |
504 |
|
|
d, &outl2, |
505 |
|
|
(unsigned char *)&data, len - data_hdr_size ()); |
506 |
|
|
outl += outl2; |
507 |
|
|
|
508 |
|
|
EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
509 |
|
|
outl += outl2; |
510 |
|
|
|
511 |
pcg |
1.12 |
seqno = ntohl (*(u32 *)(d + RAND_SIZE)); |
512 |
pcg |
1.1 |
|
513 |
pcg |
1.2 |
id2mac (dst () ? dst() : THISNODE->id, p->dst); |
514 |
|
|
id2mac (src (), p->src); |
515 |
pcg |
1.1 |
|
516 |
|
|
#if ENABLE_COMPRESSION |
517 |
|
|
if (type == PT_DATA_COMPRESSED) |
518 |
|
|
{ |
519 |
|
|
u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
520 |
|
|
p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
521 |
|
|
} |
522 |
|
|
else |
523 |
|
|
p->len = outl + (6 + 6 - DATAHDR); |
524 |
|
|
#endif |
525 |
|
|
|
526 |
|
|
return p; |
527 |
|
|
} |
528 |
|
|
|
529 |
|
|
struct ping_packet : vpn_packet |
530 |
|
|
{ |
531 |
|
|
void setup (int dst, ptype type) |
532 |
|
|
{ |
533 |
|
|
set_hdr (type, dst); |
534 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
535 |
|
|
} |
536 |
|
|
}; |
537 |
|
|
|
538 |
|
|
struct config_packet : vpn_packet |
539 |
|
|
{ |
540 |
|
|
// actually, hmaclen cannot be checked because the hmac |
541 |
|
|
// field comes before this data, so peers with other |
542 |
|
|
// hmacs simply will not work. |
543 |
|
|
u8 prot_major, prot_minor, randsize, hmaclen; |
544 |
|
|
u8 flags, challengelen, pad2, pad3; |
545 |
|
|
u32 cipher_nid; |
546 |
|
|
u32 digest_nid; |
547 |
|
|
|
548 |
|
|
const u8 curflags () const |
549 |
|
|
{ |
550 |
|
|
return 0x80 |
551 |
pcg |
1.9 |
| (ENABLE_COMPRESSION ? 0x01 : 0x00); |
552 |
pcg |
1.1 |
} |
553 |
|
|
|
554 |
|
|
void setup (ptype type, int dst) |
555 |
|
|
{ |
556 |
|
|
prot_major = PROTOCOL_MAJOR; |
557 |
|
|
prot_minor = PROTOCOL_MINOR; |
558 |
|
|
randsize = RAND_SIZE; |
559 |
|
|
hmaclen = HMACLENGTH; |
560 |
|
|
flags = curflags (); |
561 |
|
|
challengelen = sizeof (rsachallenge); |
562 |
|
|
|
563 |
|
|
cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
564 |
|
|
digest_nid = htonl (EVP_MD_type (DIGEST)); |
565 |
|
|
|
566 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
567 |
|
|
set_hdr (type, dst); |
568 |
|
|
} |
569 |
|
|
|
570 |
|
|
bool chk_config () |
571 |
|
|
{ |
572 |
|
|
return prot_major == PROTOCOL_MAJOR |
573 |
|
|
&& randsize == RAND_SIZE |
574 |
|
|
&& hmaclen == HMACLENGTH |
575 |
|
|
&& flags == curflags () |
576 |
|
|
&& challengelen == sizeof (rsachallenge) |
577 |
|
|
&& cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
578 |
|
|
&& digest_nid == htonl (EVP_MD_type (DIGEST)); |
579 |
|
|
} |
580 |
|
|
}; |
581 |
|
|
|
582 |
|
|
struct auth_packet : config_packet |
583 |
|
|
{ |
584 |
|
|
char magic[8]; |
585 |
|
|
u8 subtype; |
586 |
|
|
u8 pad1, pad2; |
587 |
|
|
rsaencrdata challenge; |
588 |
|
|
|
589 |
|
|
auth_packet (int dst, auth_subtype stype) |
590 |
|
|
{ |
591 |
|
|
config_packet::setup (PT_AUTH, dst); |
592 |
|
|
subtype = stype; |
593 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
594 |
|
|
strncpy (magic, MAGIC, 8); |
595 |
|
|
} |
596 |
|
|
}; |
597 |
|
|
|
598 |
|
|
struct connect_req_packet : vpn_packet |
599 |
|
|
{ |
600 |
|
|
u8 id; |
601 |
|
|
u8 pad1, pad2, pad3; |
602 |
|
|
|
603 |
|
|
connect_req_packet (int dst, int id) |
604 |
|
|
{ |
605 |
|
|
this->id = id; |
606 |
|
|
set_hdr (PT_CONNECT_REQ, dst); |
607 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
608 |
|
|
} |
609 |
|
|
}; |
610 |
|
|
|
611 |
|
|
struct connect_info_packet : vpn_packet |
612 |
|
|
{ |
613 |
|
|
u8 id; |
614 |
|
|
u8 pad1, pad2, pad3; |
615 |
|
|
sockinfo si; |
616 |
|
|
|
617 |
|
|
connect_info_packet (int dst, int id, sockinfo &si) |
618 |
|
|
{ |
619 |
|
|
this->id = id; |
620 |
|
|
this->si = si; |
621 |
|
|
set_hdr (PT_CONNECT_INFO, dst); |
622 |
|
|
len = sizeof (*this) - sizeof (net_packet); |
623 |
|
|
} |
624 |
|
|
}; |
625 |
|
|
|
626 |
|
|
///////////////////////////////////////////////////////////////////////////// |
627 |
|
|
|
628 |
|
|
void |
629 |
|
|
fill_sa (SOCKADDR *sa, conf_node *conf) |
630 |
|
|
{ |
631 |
|
|
sa->sin_family = AF_INET; |
632 |
|
|
sa->sin_port = htons (conf->port); |
633 |
|
|
sa->sin_addr.s_addr = 0; |
634 |
|
|
|
635 |
|
|
if (conf->hostname) |
636 |
|
|
{ |
637 |
|
|
struct hostent *he = gethostbyname (conf->hostname); |
638 |
|
|
|
639 |
|
|
if (he |
640 |
|
|
&& he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0]) |
641 |
|
|
{ |
642 |
|
|
//sa->sin_family = he->h_addrtype; |
643 |
|
|
memcpy (&sa->sin_addr, he->h_addr_list[0], 4); |
644 |
|
|
} |
645 |
|
|
else |
646 |
|
|
slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname); |
647 |
|
|
} |
648 |
|
|
} |
649 |
|
|
|
650 |
|
|
void |
651 |
|
|
connection::reset_dstaddr () |
652 |
|
|
{ |
653 |
|
|
fill_sa (&sa, conf); |
654 |
|
|
} |
655 |
|
|
|
656 |
|
|
void |
657 |
|
|
connection::send_ping (SOCKADDR *dsa, u8 pong) |
658 |
|
|
{ |
659 |
|
|
ping_packet *pkt = new ping_packet; |
660 |
|
|
|
661 |
|
|
pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
662 |
pcg |
1.6 |
vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY); |
663 |
pcg |
1.1 |
|
664 |
|
|
delete pkt; |
665 |
|
|
} |
666 |
|
|
|
667 |
|
|
void |
668 |
|
|
connection::send_reset (SOCKADDR *dsa) |
669 |
|
|
{ |
670 |
|
|
static net_rate_limiter limiter(1); |
671 |
|
|
|
672 |
pcg |
1.10 |
if (limiter.can (dsa) && connectmode != conf_node::C_DISABLED) |
673 |
pcg |
1.1 |
{ |
674 |
|
|
config_packet *pkt = new config_packet; |
675 |
|
|
|
676 |
|
|
pkt->setup (vpn_packet::PT_RESET, conf->id); |
677 |
pcg |
1.6 |
vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST); |
678 |
pcg |
1.1 |
|
679 |
|
|
delete pkt; |
680 |
|
|
} |
681 |
|
|
} |
682 |
|
|
|
683 |
|
|
static rsachallenge * |
684 |
pcg |
1.10 |
gen_challenge (u32 seqrand, SOCKADDR *sa) |
685 |
pcg |
1.1 |
{ |
686 |
|
|
static rsachallenge k; |
687 |
|
|
|
688 |
|
|
memcpy (&k, &challenge_bytes (), sizeof (k)); |
689 |
pcg |
1.10 |
*(u32 *)&k[CHG_SEQNO] ^= seqrand; |
690 |
pcg |
1.1 |
xor_sa (k, sa); |
691 |
|
|
|
692 |
|
|
return &k; |
693 |
|
|
} |
694 |
|
|
|
695 |
|
|
void |
696 |
pcg |
1.10 |
connection::send_auth (auth_subtype subtype, SOCKADDR *sa, const rsachallenge *k) |
697 |
pcg |
1.1 |
{ |
698 |
pcg |
1.10 |
static net_rate_limiter limiter(0.2); |
699 |
pcg |
1.1 |
|
700 |
|
|
if (subtype != AUTH_INIT || limiter.can (sa)) |
701 |
|
|
{ |
702 |
pcg |
1.10 |
if (!k) |
703 |
|
|
k = gen_challenge (seqrand, sa); |
704 |
|
|
|
705 |
pcg |
1.1 |
auth_packet *pkt = new auth_packet (conf->id, subtype); |
706 |
|
|
|
707 |
pcg |
1.10 |
memcpy (pkt->challenge, rsa_cache.public_encrypt (conf->rsa_key, *k), sizeof (rsaencrdata)); |
708 |
pcg |
1.1 |
|
709 |
|
|
slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
710 |
|
|
|
711 |
pcg |
1.6 |
vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
712 |
pcg |
1.1 |
|
713 |
|
|
delete pkt; |
714 |
|
|
} |
715 |
|
|
} |
716 |
|
|
|
717 |
|
|
void |
718 |
pcg |
1.9 |
connection::establish_connection_cb (tstamp &ts) |
719 |
pcg |
1.1 |
{ |
720 |
pcg |
1.9 |
if (ictx || conf == THISNODE || connectmode == conf_node::C_NEVER) |
721 |
|
|
ts = TSTAMP_CANCEL; |
722 |
|
|
else if (ts <= NOW) |
723 |
pcg |
1.1 |
{ |
724 |
pcg |
1.9 |
double retry_int = double (retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2)) * 0.25; |
725 |
pcg |
1.1 |
|
726 |
pcg |
1.9 |
if (retry_int < 3600 * 8) |
727 |
|
|
retry_cnt++; |
728 |
pcg |
1.1 |
|
729 |
pcg |
1.9 |
if (connectmode == conf_node::C_ONDEMAND |
730 |
|
|
&& retry_int > ::conf.keepalive) |
731 |
|
|
retry_int = ::conf.keepalive; |
732 |
pcg |
1.1 |
|
733 |
pcg |
1.9 |
ts = NOW + retry_int; |
734 |
pcg |
1.1 |
|
735 |
pcg |
1.9 |
if (conf->hostname) |
736 |
|
|
{ |
737 |
|
|
reset_dstaddr (); |
738 |
|
|
if (sa.sin_addr.s_addr) |
739 |
|
|
if (retry_cnt < 4) |
740 |
|
|
send_auth (AUTH_INIT, &sa); |
741 |
|
|
else |
742 |
|
|
send_ping (&sa, 0); |
743 |
pcg |
1.1 |
} |
744 |
pcg |
1.9 |
else |
745 |
|
|
vpn->connect_request (conf->id); |
746 |
pcg |
1.1 |
} |
747 |
|
|
} |
748 |
|
|
|
749 |
|
|
void |
750 |
|
|
connection::reset_connection () |
751 |
|
|
{ |
752 |
|
|
if (ictx && octx) |
753 |
|
|
{ |
754 |
|
|
slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename); |
755 |
|
|
|
756 |
|
|
if (::conf.script_node_down) |
757 |
|
|
run_script (this, &connection::script_node_down, false); |
758 |
|
|
} |
759 |
|
|
|
760 |
pcg |
1.10 |
delete ictx; ictx = 0; |
761 |
|
|
delete octx; octx = 0; |
762 |
pcg |
1.1 |
|
763 |
pcg |
1.10 |
RAND_bytes ((unsigned char *)&seqrand, sizeof (u32)); |
764 |
pcg |
1.1 |
|
765 |
|
|
sa.sin_port = 0; |
766 |
|
|
sa.sin_addr.s_addr = 0; |
767 |
|
|
|
768 |
|
|
last_activity = 0; |
769 |
pcg |
1.9 |
|
770 |
|
|
rekey.reset (); |
771 |
|
|
keepalive.reset (); |
772 |
|
|
establish_connection.reset (); |
773 |
pcg |
1.1 |
} |
774 |
|
|
|
775 |
|
|
void |
776 |
|
|
connection::shutdown () |
777 |
|
|
{ |
778 |
|
|
if (ictx && octx) |
779 |
|
|
send_reset (&sa); |
780 |
|
|
|
781 |
|
|
reset_connection (); |
782 |
|
|
} |
783 |
|
|
|
784 |
|
|
void |
785 |
pcg |
1.9 |
connection::rekey_cb (tstamp &ts) |
786 |
pcg |
1.1 |
{ |
787 |
pcg |
1.9 |
ts = TSTAMP_CANCEL; |
788 |
|
|
|
789 |
pcg |
1.1 |
reset_connection (); |
790 |
|
|
establish_connection (); |
791 |
|
|
} |
792 |
|
|
|
793 |
|
|
void |
794 |
|
|
connection::send_data_packet (tap_packet * pkt, bool broadcast) |
795 |
|
|
{ |
796 |
|
|
vpndata_packet *p = new vpndata_packet; |
797 |
pcg |
1.6 |
int tos = 0; |
798 |
|
|
|
799 |
|
|
if (conf->inherit_tos |
800 |
|
|
&& (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
801 |
|
|
&& ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
802 |
|
|
tos = (*pkt)[15] & IPTOS_TOS_MASK; |
803 |
pcg |
1.1 |
|
804 |
|
|
p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
805 |
pcg |
1.6 |
vpn->send_vpn_packet (p, &sa, tos); |
806 |
pcg |
1.1 |
|
807 |
|
|
delete p; |
808 |
|
|
|
809 |
|
|
if (oseqno > MAX_SEQNO) |
810 |
|
|
rekey (); |
811 |
|
|
} |
812 |
|
|
|
813 |
|
|
void |
814 |
|
|
connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
815 |
|
|
{ |
816 |
|
|
if (ictx && octx) |
817 |
|
|
send_data_packet (pkt, broadcast); |
818 |
|
|
else |
819 |
|
|
{ |
820 |
|
|
if (!broadcast)//DDDD |
821 |
|
|
queue.put (new tap_packet (*pkt)); |
822 |
|
|
|
823 |
|
|
establish_connection (); |
824 |
|
|
} |
825 |
|
|
} |
826 |
|
|
|
827 |
|
|
void |
828 |
|
|
connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
829 |
|
|
{ |
830 |
pcg |
1.9 |
last_activity = NOW; |
831 |
pcg |
1.1 |
|
832 |
|
|
slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
833 |
|
|
conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
834 |
|
|
|
835 |
|
|
switch (pkt->typ ()) |
836 |
|
|
{ |
837 |
|
|
case vpn_packet::PT_PING: |
838 |
|
|
send_ping (ssa, 1); // pong |
839 |
|
|
break; |
840 |
|
|
|
841 |
|
|
case vpn_packet::PT_PONG: |
842 |
|
|
// we send pings instead of auth packets after some retries, |
843 |
|
|
// so reset the retry counter and establish a conenction |
844 |
|
|
// when we receive a pong. |
845 |
|
|
if (!ictx && !octx) |
846 |
|
|
{ |
847 |
|
|
retry_cnt = 0; |
848 |
pcg |
1.9 |
establish_connection.at = 0; |
849 |
pcg |
1.1 |
establish_connection (); |
850 |
|
|
} |
851 |
|
|
|
852 |
|
|
break; |
853 |
|
|
|
854 |
|
|
case vpn_packet::PT_RESET: |
855 |
|
|
{ |
856 |
|
|
reset_connection (); |
857 |
|
|
|
858 |
|
|
config_packet *p = (config_packet *) pkt; |
859 |
pcg |
1.9 |
if (!p->chk_config ()) |
860 |
|
|
{ |
861 |
pcg |
1.10 |
slog (L_WARN, _("protocol mismatch, disabling node '%s'"), conf->nodename); |
862 |
|
|
connectmode = conf_node::C_DISABLED; |
863 |
pcg |
1.9 |
} |
864 |
|
|
else if (connectmode == conf_node::C_ALWAYS) |
865 |
|
|
establish_connection (); |
866 |
pcg |
1.1 |
} |
867 |
|
|
break; |
868 |
|
|
|
869 |
|
|
case vpn_packet::PT_AUTH: |
870 |
|
|
{ |
871 |
|
|
auth_packet *p = (auth_packet *) pkt; |
872 |
|
|
|
873 |
|
|
slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype); |
874 |
|
|
|
875 |
|
|
if (p->chk_config () |
876 |
|
|
&& !strncmp (p->magic, MAGIC, 8)) |
877 |
|
|
{ |
878 |
|
|
if (p->prot_minor != PROTOCOL_MINOR) |
879 |
|
|
slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."), |
880 |
|
|
PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
881 |
|
|
|
882 |
|
|
if (p->subtype == AUTH_INIT) |
883 |
|
|
send_auth (AUTH_INITREPLY, ssa); |
884 |
|
|
|
885 |
pcg |
1.10 |
const rsachallenge *k = rsa_cache.private_decrypt (::conf.rsa_key, p->challenge); |
886 |
pcg |
1.1 |
|
887 |
pcg |
1.10 |
if (!k) |
888 |
pcg |
1.1 |
{ |
889 |
pcg |
1.12 |
slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
890 |
pcg |
1.1 |
conf->nodename, (const char *)sockinfo (ssa)); |
891 |
|
|
break; |
892 |
|
|
} |
893 |
|
|
|
894 |
|
|
retry_cnt = 0; |
895 |
pcg |
1.9 |
establish_connection.set (NOW + 8); //? ;) |
896 |
|
|
keepalive.reset (); |
897 |
|
|
rekey.reset (); |
898 |
pcg |
1.1 |
|
899 |
|
|
switch (p->subtype) |
900 |
|
|
{ |
901 |
|
|
case AUTH_INIT: |
902 |
|
|
case AUTH_INITREPLY: |
903 |
|
|
delete ictx; |
904 |
|
|
ictx = 0; |
905 |
|
|
|
906 |
|
|
delete octx; |
907 |
|
|
|
908 |
pcg |
1.10 |
octx = new crypto_ctx (*k, 1); |
909 |
pcg |
1.13 |
oseqno = ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff; |
910 |
pcg |
1.1 |
|
911 |
pcg |
1.10 |
send_auth (AUTH_REPLY, ssa, k); |
912 |
pcg |
1.1 |
break; |
913 |
|
|
|
914 |
|
|
case AUTH_REPLY: |
915 |
|
|
|
916 |
pcg |
1.10 |
if (!memcmp ((u8 *)gen_challenge (seqrand, ssa), (u8 *)k, sizeof (rsachallenge))) |
917 |
pcg |
1.1 |
{ |
918 |
|
|
delete ictx; |
919 |
|
|
|
920 |
pcg |
1.10 |
ictx = new crypto_ctx (*k, 0); |
921 |
pcg |
1.13 |
iseqno.reset (ntohl (*(u32 *)&k[CHG_SEQNO]) & 0x7fffffff); // at least 2**31 sequence numbers are valid |
922 |
pcg |
1.1 |
|
923 |
|
|
sa = *ssa; |
924 |
|
|
|
925 |
pcg |
1.9 |
rekey.set (NOW + ::conf.rekey); |
926 |
|
|
keepalive.set (NOW + ::conf.keepalive); |
927 |
pcg |
1.1 |
|
928 |
|
|
// send queued packets |
929 |
|
|
while (tap_packet *p = queue.get ()) |
930 |
|
|
{ |
931 |
|
|
send_data_packet (p); |
932 |
|
|
delete p; |
933 |
|
|
} |
934 |
|
|
|
935 |
pcg |
1.5 |
connectmode = conf->connectmode; |
936 |
|
|
|
937 |
pcg |
1.1 |
slog (L_INFO, _("connection to %d (%s %s) established"), |
938 |
|
|
conf->id, conf->nodename, (const char *)sockinfo (ssa)); |
939 |
|
|
|
940 |
|
|
if (::conf.script_node_up) |
941 |
|
|
run_script (this, &connection::script_node_up, false); |
942 |
|
|
} |
943 |
|
|
else |
944 |
|
|
slog (L_ERR, _("sent and received challenge do not match with (%s %s))"), |
945 |
|
|
conf->nodename, (const char *)sockinfo (ssa)); |
946 |
|
|
|
947 |
|
|
break; |
948 |
|
|
default: |
949 |
|
|
slog (L_ERR, _("authentification illegal subtype error (%s %s)"), |
950 |
|
|
conf->nodename, (const char *)sockinfo (ssa)); |
951 |
|
|
break; |
952 |
|
|
} |
953 |
|
|
} |
954 |
|
|
else |
955 |
|
|
send_reset (ssa); |
956 |
|
|
|
957 |
|
|
break; |
958 |
|
|
} |
959 |
|
|
|
960 |
|
|
case vpn_packet::PT_DATA_COMPRESSED: |
961 |
|
|
#if !ENABLE_COMPRESSION |
962 |
|
|
send_reset (ssa); |
963 |
|
|
break; |
964 |
|
|
#endif |
965 |
|
|
case vpn_packet::PT_DATA_UNCOMPRESSED: |
966 |
|
|
|
967 |
|
|
if (ictx && octx) |
968 |
|
|
{ |
969 |
|
|
vpndata_packet *p = (vpndata_packet *)pkt; |
970 |
|
|
|
971 |
|
|
if (*ssa == sa) |
972 |
|
|
{ |
973 |
|
|
if (!p->hmac_chk (ictx)) |
974 |
|
|
slog (L_ERR, _("hmac authentication error, received invalid packet\n" |
975 |
|
|
"could be an attack, or just corruption or an synchronization error")); |
976 |
|
|
else |
977 |
|
|
{ |
978 |
|
|
u32 seqno; |
979 |
|
|
tap_packet *d = p->unpack (this, seqno); |
980 |
|
|
|
981 |
pcg |
1.8 |
if (iseqno.recv_ok (seqno)) |
982 |
pcg |
1.1 |
{ |
983 |
pcg |
1.8 |
vpn->tap->send (d); |
984 |
pcg |
1.1 |
|
985 |
pcg |
1.8 |
if (p->dst () == 0) // re-broadcast |
986 |
|
|
for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
987 |
|
|
{ |
988 |
|
|
connection *c = *i; |
989 |
pcg |
1.1 |
|
990 |
pcg |
1.8 |
if (c->conf != THISNODE && c->conf != conf) |
991 |
|
|
c->inject_data_packet (d); |
992 |
|
|
} |
993 |
|
|
|
994 |
|
|
delete d; |
995 |
|
|
|
996 |
|
|
break; |
997 |
pcg |
1.1 |
} |
998 |
|
|
} |
999 |
|
|
} |
1000 |
|
|
else |
1001 |
|
|
slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D |
1002 |
|
|
} |
1003 |
|
|
|
1004 |
|
|
send_reset (ssa); |
1005 |
|
|
break; |
1006 |
|
|
|
1007 |
|
|
case vpn_packet::PT_CONNECT_REQ: |
1008 |
|
|
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
1009 |
|
|
{ |
1010 |
|
|
connect_req_packet *p = (connect_req_packet *) pkt; |
1011 |
|
|
|
1012 |
|
|
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1013 |
|
|
|
1014 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1015 |
|
|
|
1016 |
|
|
slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
1017 |
|
|
conf->id, p->id, c->ictx && c->octx); |
1018 |
|
|
|
1019 |
|
|
if (c->ictx && c->octx) |
1020 |
|
|
{ |
1021 |
pcg |
1.4 |
// send connect_info packets to both sides, in case one is |
1022 |
|
|
// behind a nat firewall (or both ;) |
1023 |
|
|
{ |
1024 |
|
|
sockinfo si(sa); |
1025 |
|
|
|
1026 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
1027 |
|
|
c->conf->id, conf->id, (const char *)si); |
1028 |
pcg |
1.1 |
|
1029 |
pcg |
1.4 |
connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si); |
1030 |
pcg |
1.1 |
|
1031 |
pcg |
1.4 |
r->hmac_set (c->octx); |
1032 |
|
|
vpn->send_vpn_packet (r, &c->sa); |
1033 |
pcg |
1.1 |
|
1034 |
pcg |
1.4 |
delete r; |
1035 |
|
|
} |
1036 |
|
|
|
1037 |
|
|
{ |
1038 |
|
|
sockinfo si(c->sa); |
1039 |
|
|
|
1040 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
1041 |
|
|
conf->id, c->conf->id, (const char *)si); |
1042 |
|
|
|
1043 |
|
|
connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si); |
1044 |
|
|
|
1045 |
|
|
r->hmac_set (octx); |
1046 |
|
|
vpn->send_vpn_packet (r, &sa); |
1047 |
|
|
|
1048 |
|
|
delete r; |
1049 |
|
|
} |
1050 |
pcg |
1.1 |
} |
1051 |
|
|
} |
1052 |
|
|
|
1053 |
|
|
break; |
1054 |
|
|
|
1055 |
|
|
case vpn_packet::PT_CONNECT_INFO: |
1056 |
|
|
if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
1057 |
|
|
{ |
1058 |
|
|
connect_info_packet *p = (connect_info_packet *) pkt; |
1059 |
|
|
|
1060 |
|
|
assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
1061 |
|
|
|
1062 |
|
|
connection *c = vpn->conns[p->id - 1]; |
1063 |
|
|
|
1064 |
|
|
slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
1065 |
|
|
conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
1066 |
|
|
|
1067 |
|
|
c->send_auth (AUTH_INIT, p->si.sa ()); |
1068 |
|
|
} |
1069 |
|
|
break; |
1070 |
|
|
|
1071 |
|
|
default: |
1072 |
|
|
send_reset (ssa); |
1073 |
|
|
break; |
1074 |
|
|
} |
1075 |
|
|
} |
1076 |
|
|
|
1077 |
pcg |
1.9 |
void connection::keepalive_cb (tstamp &ts) |
1078 |
pcg |
1.1 |
{ |
1079 |
pcg |
1.9 |
if (NOW >= last_activity + ::conf.keepalive + 30) |
1080 |
|
|
{ |
1081 |
|
|
reset_connection (); |
1082 |
|
|
establish_connection (); |
1083 |
|
|
} |
1084 |
|
|
else if (NOW < last_activity + ::conf.keepalive) |
1085 |
|
|
ts = last_activity + ::conf.keepalive; |
1086 |
|
|
else if (conf->connectmode != conf_node::C_ONDEMAND |
1087 |
|
|
|| THISNODE->connectmode != conf_node::C_ONDEMAND) |
1088 |
pcg |
1.1 |
{ |
1089 |
pcg |
1.9 |
send_ping (&sa); |
1090 |
|
|
ts = NOW + 5; |
1091 |
|
|
} |
1092 |
|
|
else |
1093 |
|
|
reset_connection (); |
1094 |
pcg |
1.1 |
|
1095 |
|
|
} |
1096 |
|
|
|
1097 |
|
|
void connection::connect_request (int id) |
1098 |
|
|
{ |
1099 |
|
|
connect_req_packet *p = new connect_req_packet (conf->id, id); |
1100 |
|
|
|
1101 |
|
|
slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id); |
1102 |
|
|
p->hmac_set (octx); |
1103 |
|
|
vpn->send_vpn_packet (p, &sa); |
1104 |
|
|
|
1105 |
|
|
delete p; |
1106 |
|
|
} |
1107 |
|
|
|
1108 |
|
|
void connection::script_node () |
1109 |
|
|
{ |
1110 |
|
|
vpn->script_if_up (); |
1111 |
|
|
|
1112 |
|
|
char *env; |
1113 |
|
|
asprintf (&env, "DESTID=%d", conf->id); |
1114 |
|
|
putenv (env); |
1115 |
|
|
asprintf (&env, "DESTNODE=%s", conf->nodename); |
1116 |
|
|
putenv (env); |
1117 |
|
|
asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr)); |
1118 |
|
|
putenv (env); |
1119 |
|
|
asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port)); |
1120 |
|
|
putenv (env); |
1121 |
|
|
} |
1122 |
|
|
|
1123 |
|
|
const char *connection::script_node_up () |
1124 |
|
|
{ |
1125 |
|
|
script_node (); |
1126 |
|
|
|
1127 |
|
|
putenv ("STATE=up"); |
1128 |
|
|
|
1129 |
|
|
return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
1130 |
|
|
} |
1131 |
|
|
|
1132 |
|
|
const char *connection::script_node_down () |
1133 |
|
|
{ |
1134 |
|
|
script_node (); |
1135 |
|
|
|
1136 |
|
|
putenv ("STATE=down"); |
1137 |
|
|
|
1138 |
|
|
return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
1139 |
|
|
} |
1140 |
|
|
|
1141 |
pcg |
1.9 |
connection::connection(struct vpn *vpn_) |
1142 |
|
|
: vpn(vpn_) |
1143 |
|
|
, rekey (this, &connection::rekey_cb) |
1144 |
|
|
, keepalive (this, &connection::keepalive_cb) |
1145 |
|
|
, establish_connection (this, &connection::establish_connection_cb) |
1146 |
|
|
{ |
1147 |
|
|
octx = ictx = 0; |
1148 |
|
|
retry_cnt = 0; |
1149 |
|
|
|
1150 |
|
|
connectmode = conf_node::C_ALWAYS; // initial setting |
1151 |
|
|
reset_connection (); |
1152 |
|
|
} |
1153 |
|
|
|
1154 |
|
|
connection::~connection () |
1155 |
|
|
{ |
1156 |
|
|
shutdown (); |
1157 |
|
|
} |
1158 |
|
|
|
1159 |
pcg |
1.1 |
///////////////////////////////////////////////////////////////////////////// |
1160 |
|
|
|
1161 |
|
|
const char *vpn::script_if_up () |
1162 |
|
|
{ |
1163 |
|
|
// the tunnel device mtu should be the physical mtu - overhead |
1164 |
|
|
// the tricky part is rounding to the cipher key blocksize |
1165 |
|
|
int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD; |
1166 |
|
|
mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
1167 |
|
|
mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
1168 |
|
|
mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
1169 |
|
|
|
1170 |
|
|
char *env; |
1171 |
|
|
asprintf (&env, "CONFBASE=%s", confbase); |
1172 |
|
|
putenv (env); |
1173 |
|
|
asprintf (&env, "NODENAME=%s", THISNODE->nodename); |
1174 |
|
|
putenv (env); |
1175 |
|
|
asprintf (&env, "NODEID=%d", THISNODE->id); |
1176 |
|
|
putenv (env); |
1177 |
|
|
asprintf (&env, "IFNAME=%s", tap->interface ()); |
1178 |
|
|
putenv (env); |
1179 |
|
|
asprintf (&env, "MTU=%d", mtu); |
1180 |
|
|
putenv (env); |
1181 |
|
|
asprintf (&env, "MAC=%02x:%02x:%02x:%02x:%02x:%02x", |
1182 |
|
|
0xfe, 0xfd, 0x80, 0x00, THISNODE->id >> 8, |
1183 |
|
|
THISNODE->id & 0xff); |
1184 |
|
|
putenv (env); |
1185 |
|
|
|
1186 |
|
|
return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
1187 |
|
|
} |
1188 |
|
|
|
1189 |
|
|
int |
1190 |
|
|
vpn::setup (void) |
1191 |
|
|
{ |
1192 |
|
|
struct sockaddr_in sa; |
1193 |
|
|
|
1194 |
|
|
socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
1195 |
|
|
if (socket_fd < 0) |
1196 |
|
|
return -1; |
1197 |
|
|
|
1198 |
|
|
fill_sa (&sa, THISNODE); |
1199 |
|
|
|
1200 |
|
|
if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa))) |
1201 |
|
|
{ |
1202 |
|
|
slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1203 |
|
|
exit (1); |
1204 |
|
|
} |
1205 |
|
|
|
1206 |
|
|
#ifdef IP_MTU_DISCOVER |
1207 |
|
|
// this I really consider a linux bug. I am neither connected |
1208 |
|
|
// nor do I fragment myself. Linux still sets DF and doesn't |
1209 |
|
|
// fragment for me sometimes. |
1210 |
|
|
{ |
1211 |
|
|
int oval = IP_PMTUDISC_DONT; |
1212 |
|
|
setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
1213 |
|
|
} |
1214 |
|
|
#endif |
1215 |
|
|
{ |
1216 |
|
|
int oval = 1; |
1217 |
|
|
setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
1218 |
|
|
} |
1219 |
|
|
|
1220 |
pcg |
1.9 |
udp_ev_watcher.start (socket_fd, POLLIN); |
1221 |
|
|
|
1222 |
pcg |
1.1 |
tap = new tap_device (); |
1223 |
|
|
if (!tap) //D this, of course, never catches |
1224 |
|
|
{ |
1225 |
|
|
slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
1226 |
|
|
exit (1); |
1227 |
|
|
} |
1228 |
pcg |
1.9 |
|
1229 |
|
|
run_script (this, &vpn::script_if_up, true); |
1230 |
|
|
|
1231 |
|
|
vpn_ev_watcher.start (tap->fd, POLLIN); |
1232 |
pcg |
1.1 |
|
1233 |
pcg |
1.9 |
reconnect_all (); |
1234 |
pcg |
1.1 |
|
1235 |
|
|
return 0; |
1236 |
|
|
} |
1237 |
|
|
|
1238 |
|
|
void |
1239 |
pcg |
1.6 |
vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos) |
1240 |
pcg |
1.1 |
{ |
1241 |
pcg |
1.6 |
setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
1242 |
pcg |
1.1 |
sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa)); |
1243 |
|
|
} |
1244 |
|
|
|
1245 |
|
|
void |
1246 |
|
|
vpn::shutdown_all () |
1247 |
|
|
{ |
1248 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1249 |
|
|
(*c)->shutdown (); |
1250 |
|
|
} |
1251 |
|
|
|
1252 |
|
|
void |
1253 |
|
|
vpn::reconnect_all () |
1254 |
|
|
{ |
1255 |
|
|
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1256 |
|
|
delete *c; |
1257 |
|
|
|
1258 |
|
|
conns.clear (); |
1259 |
|
|
|
1260 |
|
|
for (configuration::node_vector::iterator i = conf.nodes.begin (); |
1261 |
|
|
i != conf.nodes.end (); ++i) |
1262 |
|
|
{ |
1263 |
|
|
connection *conn = new connection (this); |
1264 |
|
|
|
1265 |
|
|
conn->conf = *i; |
1266 |
|
|
conns.push_back (conn); |
1267 |
|
|
|
1268 |
pcg |
1.5 |
conn->establish_connection (); |
1269 |
pcg |
1.1 |
} |
1270 |
|
|
} |
1271 |
|
|
|
1272 |
|
|
connection *vpn::find_router () |
1273 |
|
|
{ |
1274 |
|
|
u32 prio = 0; |
1275 |
|
|
connection *router = 0; |
1276 |
|
|
|
1277 |
|
|
for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1278 |
|
|
{ |
1279 |
|
|
connection *c = *i; |
1280 |
|
|
|
1281 |
|
|
if (c->conf->routerprio > prio |
1282 |
pcg |
1.5 |
&& c->connectmode == conf_node::C_ALWAYS |
1283 |
pcg |
1.1 |
&& c->conf != THISNODE |
1284 |
|
|
&& c->ictx && c->octx) |
1285 |
|
|
{ |
1286 |
|
|
prio = c->conf->routerprio; |
1287 |
|
|
router = c; |
1288 |
|
|
} |
1289 |
|
|
} |
1290 |
|
|
|
1291 |
|
|
return router; |
1292 |
|
|
} |
1293 |
|
|
|
1294 |
|
|
void vpn::connect_request (int id) |
1295 |
|
|
{ |
1296 |
|
|
connection *c = find_router (); |
1297 |
|
|
|
1298 |
|
|
if (c) |
1299 |
|
|
c->connect_request (id); |
1300 |
pcg |
1.3 |
//else // does not work, because all others must connect to the same router |
1301 |
|
|
// // no router found, aggressively connect to all routers |
1302 |
|
|
// for (conns_vector::iterator i = conns.begin (); i != conns.end (); ++i) |
1303 |
|
|
// if ((*i)->conf->routerprio) |
1304 |
|
|
// (*i)->establish_connection (); |
1305 |
pcg |
1.1 |
} |
1306 |
|
|
|
1307 |
|
|
void |
1308 |
pcg |
1.9 |
vpn::udp_ev (short revents) |
1309 |
pcg |
1.1 |
{ |
1310 |
pcg |
1.9 |
if (revents & (POLLIN | POLLERR)) |
1311 |
|
|
{ |
1312 |
|
|
vpn_packet *pkt = new vpn_packet; |
1313 |
|
|
struct sockaddr_in sa; |
1314 |
|
|
socklen_t sa_len = sizeof (sa); |
1315 |
|
|
int len; |
1316 |
pcg |
1.1 |
|
1317 |
pcg |
1.9 |
len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
1318 |
pcg |
1.1 |
|
1319 |
pcg |
1.9 |
if (len > 0) |
1320 |
|
|
{ |
1321 |
|
|
pkt->len = len; |
1322 |
|
|
|
1323 |
|
|
unsigned int src = pkt->src (); |
1324 |
|
|
unsigned int dst = pkt->dst (); |
1325 |
pcg |
1.1 |
|
1326 |
pcg |
1.9 |
slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
1327 |
|
|
(const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
1328 |
pcg |
1.1 |
|
1329 |
pcg |
1.9 |
if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
1330 |
|
|
slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
1331 |
|
|
pkt->typ (), pkt->src (), pkt->dst ()); |
1332 |
|
|
else if (dst == 0 && !THISNODE->routerprio) |
1333 |
|
|
slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
1334 |
|
|
else if (dst != 0 && dst != THISNODE->id) |
1335 |
|
|
slog (L_WARN, |
1336 |
|
|
_("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
1337 |
|
|
dst, conns[dst - 1]->conf->nodename, |
1338 |
|
|
(const char *)sockinfo (sa), |
1339 |
|
|
THISNODE->id, THISNODE->nodename); |
1340 |
|
|
else if (src == 0 || src > conns.size ()) |
1341 |
|
|
slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
1342 |
|
|
else |
1343 |
|
|
conns[src - 1]->recv_vpn_packet (pkt, &sa); |
1344 |
|
|
} |
1345 |
|
|
else |
1346 |
pcg |
1.1 |
{ |
1347 |
pcg |
1.9 |
// probably ECONNRESET or somesuch |
1348 |
|
|
slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
1349 |
|
|
} |
1350 |
|
|
|
1351 |
|
|
delete pkt; |
1352 |
|
|
} |
1353 |
|
|
else if (revents & POLLHUP) |
1354 |
|
|
{ |
1355 |
|
|
// this cannot ;) happen on udp sockets |
1356 |
|
|
slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
1357 |
|
|
exit (1); |
1358 |
|
|
} |
1359 |
|
|
else |
1360 |
|
|
{ |
1361 |
|
|
slog (L_ERR, |
1362 |
|
|
_("FATAL: unknown revents %08x in socket, terminating\n"), |
1363 |
|
|
revents); |
1364 |
|
|
exit (1); |
1365 |
|
|
} |
1366 |
|
|
} |
1367 |
pcg |
1.1 |
|
1368 |
pcg |
1.9 |
void |
1369 |
|
|
vpn::vpn_ev (short revents) |
1370 |
|
|
{ |
1371 |
|
|
if (revents & POLLIN) |
1372 |
|
|
{ |
1373 |
|
|
/* process data */ |
1374 |
|
|
tap_packet *pkt; |
1375 |
pcg |
1.1 |
|
1376 |
pcg |
1.9 |
pkt = tap->recv (); |
1377 |
pcg |
1.1 |
|
1378 |
pcg |
1.9 |
int dst = mac2id (pkt->dst); |
1379 |
|
|
int src = mac2id (pkt->src); |
1380 |
pcg |
1.1 |
|
1381 |
pcg |
1.9 |
if (src != THISNODE->id) |
1382 |
|
|
{ |
1383 |
|
|
slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
1384 |
|
|
exit (1); |
1385 |
|
|
} |
1386 |
pcg |
1.1 |
|
1387 |
pcg |
1.9 |
if (dst == THISNODE->id) |
1388 |
|
|
{ |
1389 |
|
|
slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
1390 |
|
|
exit (1); |
1391 |
|
|
} |
1392 |
pcg |
1.1 |
|
1393 |
pcg |
1.9 |
if (dst > conns.size ()) |
1394 |
|
|
slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
1395 |
|
|
else |
1396 |
|
|
{ |
1397 |
|
|
if (dst) |
1398 |
|
|
{ |
1399 |
|
|
// unicast |
1400 |
|
|
if (dst != THISNODE->id) |
1401 |
|
|
conns[dst - 1]->inject_data_packet (pkt); |
1402 |
pcg |
1.1 |
} |
1403 |
pcg |
1.9 |
else |
1404 |
pcg |
1.1 |
{ |
1405 |
pcg |
1.9 |
// broadcast, first check router, then self, then english |
1406 |
|
|
connection *router = find_router (); |
1407 |
pcg |
1.1 |
|
1408 |
pcg |
1.9 |
if (router) |
1409 |
|
|
router->inject_data_packet (pkt, true); |
1410 |
pcg |
1.1 |
else |
1411 |
pcg |
1.9 |
for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
1412 |
|
|
if ((*c)->conf != THISNODE) |
1413 |
|
|
(*c)->inject_data_packet (pkt); |
1414 |
pcg |
1.1 |
} |
1415 |
|
|
} |
1416 |
|
|
|
1417 |
pcg |
1.9 |
delete pkt; |
1418 |
|
|
} |
1419 |
|
|
else if (revents & (POLLHUP | POLLERR)) |
1420 |
|
|
{ |
1421 |
|
|
slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
1422 |
|
|
exit (1); |
1423 |
|
|
} |
1424 |
|
|
else |
1425 |
|
|
abort (); |
1426 |
|
|
} |
1427 |
|
|
|
1428 |
|
|
void |
1429 |
|
|
vpn::event_cb (tstamp &ts) |
1430 |
|
|
{ |
1431 |
|
|
if (events) |
1432 |
|
|
{ |
1433 |
|
|
if (events & EVENT_SHUTDOWN) |
1434 |
pcg |
1.1 |
{ |
1435 |
pcg |
1.9 |
shutdown_all (); |
1436 |
pcg |
1.1 |
|
1437 |
pcg |
1.9 |
remove_pid (pidfilename); |
1438 |
pcg |
1.1 |
|
1439 |
pcg |
1.9 |
slog (L_INFO, _("vped terminating")); |
1440 |
pcg |
1.1 |
|
1441 |
pcg |
1.9 |
exit (0); |
1442 |
|
|
} |
1443 |
pcg |
1.1 |
|
1444 |
pcg |
1.9 |
if (events & EVENT_RECONNECT) |
1445 |
|
|
reconnect_all (); |
1446 |
pcg |
1.1 |
|
1447 |
pcg |
1.9 |
events = 0; |
1448 |
|
|
} |
1449 |
pcg |
1.1 |
|
1450 |
pcg |
1.9 |
ts = TSTAMP_CANCEL; |
1451 |
|
|
} |
1452 |
pcg |
1.1 |
|
1453 |
pcg |
1.9 |
vpn::vpn (void) |
1454 |
|
|
: udp_ev_watcher (this, &vpn::udp_ev) |
1455 |
|
|
, vpn_ev_watcher (this, &vpn::vpn_ev) |
1456 |
|
|
, event (this, &vpn::event_cb) |
1457 |
|
|
{ |
1458 |
pcg |
1.1 |
} |
1459 |
|
|
|
1460 |
|
|
vpn::~vpn () |
1461 |
pcg |
1.9 |
{ |
1462 |
|
|
} |
1463 |
pcg |
1.1 |
|