| … | |
… | |
| 16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
16 | Foundation, Inc. 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
17 | */ |
| 18 | |
18 | |
| 19 | #include "config.h" |
19 | #include "config.h" |
| 20 | |
20 | |
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|
21 | #include <list> |
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|
22 | |
| 21 | #include <cstdlib> |
23 | #include <cstdlib> |
| 22 | #include <cstring> |
24 | #include <cstring> |
| 23 | #include <cstdio> |
25 | #include <cstdio> |
| 24 | |
26 | |
| 25 | #include <sys/types.h> |
27 | #include <sys/types.h> |
| … | |
… | |
| 30 | #include <arpa/inet.h> |
32 | #include <arpa/inet.h> |
| 31 | #include <errno.h> |
33 | #include <errno.h> |
| 32 | #include <time.h> |
34 | #include <time.h> |
| 33 | #include <unistd.h> |
35 | #include <unistd.h> |
| 34 | |
36 | |
| 35 | #include <openssl/rand.h> |
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| 36 | #include <openssl/hmac.h> |
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| 37 | #include <openssl/evp.h> |
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| 38 | #include <openssl/rsa.h> |
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| 39 | #include <openssl/err.h> |
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| 40 | |
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| 41 | extern "C" { |
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| 42 | # include "lzf/lzf.h" |
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| 43 | } |
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| 44 | |
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| 45 | #include "gettext.h" |
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| 46 | #include "pidfile.h" |
37 | #include "pidfile.h" |
| 47 | |
38 | |
| 48 | #include "conf.h" |
39 | #include "connection.h" |
| 49 | #include "slog.h" |
40 | #include "util.h" |
| 50 | #include "device.h" |
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| 51 | #include "protocol.h" |
41 | #include "protocol.h" |
| 52 | |
42 | |
| 53 | #if !HAVE_RAND_PSEUDO_BYTES |
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| 54 | # define RAND_pseudo_bytes RAND_bytes |
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| 55 | #endif |
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| 56 | |
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| 57 | static time_t next_timecheck; |
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| 58 | |
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| 59 | #define MAGIC "vped\xbd\xc6\xdb\x82" // 8 bytes of magic |
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| 60 | |
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| 61 | static const rsachallenge & |
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| 62 | challenge_bytes () |
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| 63 | { |
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| 64 | static rsachallenge challenge; |
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| 65 | static time_t challenge_ttl; // time this challenge needs to be recreated |
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| 66 | |
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| 67 | if (now > challenge_ttl) |
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| 68 | { |
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| 69 | RAND_bytes ((unsigned char *)&challenge, sizeof (challenge)); |
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| 70 | challenge_ttl = now + CHALLENGE_TTL; |
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| 71 | } |
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| 72 | |
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| 73 | return challenge; |
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| 74 | } |
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| 75 | |
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| 76 | // run a script. yes, it's a template function. yes, c++ |
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| 77 | // is not a functional language. yes, this suxx. |
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| 78 | template<class owner> |
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| 79 | static void |
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| 80 | run_script (owner *obj, const char *(owner::*setup)(), bool wait) |
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| 81 | { |
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| 82 | int pid; |
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| 83 | |
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| 84 | if ((pid = fork ()) == 0) |
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| 85 | { |
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| 86 | char *filename; |
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| 87 | asprintf (&filename, "%s/%s", confbase, (obj->*setup) ()); |
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| 88 | execl (filename, filename, (char *) 0); |
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| 89 | exit (255); |
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| 90 | } |
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| 91 | else if (pid > 0) |
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| 92 | { |
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| 93 | if (wait) |
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| 94 | { |
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| 95 | waitpid (pid, 0, 0); |
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| 96 | /* TODO: check status */ |
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| 97 | } |
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| 98 | } |
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| 99 | } |
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| 100 | |
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| 101 | // xor the socket address into the challenge to ensure different challenges |
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| 102 | // per host. we could rely on the OAEP padding, but this doesn't hurt. |
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| 103 | void |
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| 104 | xor_sa (rsachallenge &k, SOCKADDR *sa) |
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| 105 | { |
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| 106 | ((u32 *) k)[(CHG_CIPHER_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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| 107 | ((u16 *) k)[(CHG_CIPHER_KEY + 4) / 2] ^= sa->sin_port; |
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| 108 | ((u32 *) k)[(CHG_HMAC_KEY + 0) / 4] ^= sa->sin_addr.s_addr; |
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| 109 | ((u16 *) k)[(CHG_HMAC_KEY + 4) / 2] ^= sa->sin_port; |
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| 110 | } |
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| 111 | |
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| 112 | struct crypto_ctx |
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| 113 | { |
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| 114 | EVP_CIPHER_CTX cctx; |
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| 115 | HMAC_CTX hctx; |
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| 116 | |
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| 117 | crypto_ctx (rsachallenge &challenge, int enc); |
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| 118 | ~crypto_ctx (); |
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| 119 | }; |
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| 120 | |
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| 121 | crypto_ctx::crypto_ctx (rsachallenge &challenge, int enc) |
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| 122 | { |
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| 123 | EVP_CIPHER_CTX_init (&cctx); |
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| 124 | EVP_CipherInit_ex (&cctx, CIPHER, 0, &challenge[CHG_CIPHER_KEY], 0, enc); |
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| 125 | HMAC_CTX_init (&hctx); |
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| 126 | HMAC_Init_ex (&hctx, &challenge[CHG_HMAC_KEY], HMAC_KEYLEN, DIGEST, 0); |
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| 127 | } |
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| 128 | |
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| 129 | crypto_ctx::~crypto_ctx () |
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| 130 | { |
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| 131 | EVP_CIPHER_CTX_cleanup (&cctx); |
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| 132 | HMAC_CTX_cleanup (&hctx); |
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| 133 | } |
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| 134 | |
|
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| 135 | ///////////////////////////////////////////////////////////////////////////// |
43 | ///////////////////////////////////////////////////////////////////////////// |
| 136 | |
44 | |
| 137 | static void next_wakeup (time_t next) |
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| 138 | { |
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| 139 | if (next_timecheck > next) |
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| 140 | next_timecheck = next; |
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| 141 | } |
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| 142 | |
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| 143 | static unsigned char hmac_digest[EVP_MAX_MD_SIZE]; |
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| 144 | |
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| 145 | struct hmac_packet:net_packet |
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| 146 | { |
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| 147 | u8 hmac[HMACLENGTH]; // each and every packet has a hmac field, but that is not (yet) checked everywhere |
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| 148 | |
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| 149 | void hmac_set (crypto_ctx * ctx); |
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| 150 | bool hmac_chk (crypto_ctx * ctx); |
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| 151 | |
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| 152 | private: |
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| 153 | void hmac_gen (crypto_ctx * ctx) |
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| 154 | { |
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| 155 | unsigned int xlen; |
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| 156 | HMAC_CTX *hctx = &ctx->hctx; |
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| 157 | |
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| 158 | HMAC_Init_ex (hctx, 0, 0, 0, 0); |
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| 159 | HMAC_Update (hctx, ((unsigned char *) this) + sizeof (hmac_packet), |
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| 160 | len - sizeof (hmac_packet)); |
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| 161 | HMAC_Final (hctx, (unsigned char *) &hmac_digest, &xlen); |
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| 162 | } |
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| 163 | }; |
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| 164 | |
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| 165 | void |
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| 166 | hmac_packet::hmac_set (crypto_ctx * ctx) |
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| 167 | { |
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| 168 | hmac_gen (ctx); |
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| 169 | |
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| 170 | memcpy (hmac, hmac_digest, HMACLENGTH); |
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| 171 | } |
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| 172 | |
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| 173 | bool |
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| 174 | hmac_packet::hmac_chk (crypto_ctx * ctx) |
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| 175 | { |
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| 176 | hmac_gen (ctx); |
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| 177 | |
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| 178 | return !memcmp (hmac, hmac_digest, HMACLENGTH); |
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| 179 | } |
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| 180 | |
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| 181 | struct vpn_packet : hmac_packet |
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| 182 | { |
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| 183 | enum ptype |
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| 184 | { |
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| 185 | PT_RESET = 0, |
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| 186 | PT_DATA_UNCOMPRESSED, |
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| 187 | PT_DATA_COMPRESSED, |
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| 188 | PT_PING, PT_PONG, // wasting namespace space? ;) |
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| 189 | PT_AUTH, // authentification |
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| 190 | PT_CONNECT_REQ, // want other host to contact me |
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| 191 | PT_CONNECT_INFO, // request connection to some node |
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| 192 | PT_REKEY, // rekeying (not yet implemented) |
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| 193 | PT_MAX |
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| 194 | }; |
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| 195 | |
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| 196 | u8 type; |
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| 197 | u8 srcdst, src1, dst1; |
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| 198 | |
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| 199 | void set_hdr (ptype type, unsigned int dst); |
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| 200 | |
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| 201 | unsigned int src () |
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| 202 | { |
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| 203 | return src1 | ((srcdst >> 4) << 8); |
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| 204 | } |
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| 205 | unsigned int dst () |
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| 206 | { |
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| 207 | return dst1 | ((srcdst & 0xf) << 8); |
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| 208 | } |
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| 209 | ptype typ () |
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| 210 | { |
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| 211 | return (ptype) type; |
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| 212 | } |
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| 213 | }; |
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| 214 | |
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| 215 | void vpn_packet::set_hdr (ptype type, unsigned int dst) |
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| 216 | { |
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| 217 | this->type = type; |
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| 218 | |
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| 219 | int src = THISNODE->id; |
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| 220 | |
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| 221 | src1 = src; |
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| 222 | srcdst = ((src >> 8) << 4) | (dst >> 8); |
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| 223 | dst1 = dst; |
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| 224 | } |
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| 225 | |
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| 226 | #define MAXVPNDATA (MAX_MTU - 6 - 6) |
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| 227 | #define DATAHDR (sizeof (u32) + RAND_SIZE) |
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| 228 | |
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| 229 | struct vpndata_packet:vpn_packet |
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| 230 | { |
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| 231 | u8 data[MAXVPNDATA + DATAHDR]; // seqno |
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| 232 | |
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| 233 | void setup (connection *conn, int dst, u8 *d, u32 len, u32 seqno); |
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| 234 | tap_packet *unpack (connection *conn, u32 &seqno); |
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| 235 | private: |
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| 236 | |
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| 237 | const u32 data_hdr_size () const |
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| 238 | { |
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| 239 | return sizeof (vpndata_packet) - sizeof (net_packet) - MAXVPNDATA - DATAHDR; |
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| 240 | } |
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| 241 | }; |
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| 242 | |
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| 243 | void |
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| 244 | vpndata_packet::setup (connection *conn, int dst, u8 *d, u32 l, u32 seqno) |
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| 245 | { |
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| 246 | EVP_CIPHER_CTX *cctx = &conn->octx->cctx; |
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| 247 | int outl = 0, outl2; |
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| 248 | ptype type = PT_DATA_UNCOMPRESSED; |
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| 249 | |
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| 250 | #if ENABLE_COMPRESSION |
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| 251 | u8 cdata[MAX_MTU]; |
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| 252 | u32 cl; |
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| 253 | |
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| 254 | cl = lzf_compress (d, l, cdata + 2, (l - 2) & ~7); |
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| 255 | if (cl) |
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| 256 | { |
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| 257 | //printf ("compressed packet, %d => %d\n", l, cl);//D |
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| 258 | type = PT_DATA_COMPRESSED; |
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| 259 | d = cdata; |
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| 260 | l = cl + 2; |
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| 261 | |
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| 262 | d[0] = cl >> 8; |
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| 263 | d[1] = cl; |
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| 264 | } |
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| 265 | #endif |
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| 266 | |
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| 267 | EVP_EncryptInit_ex (cctx, 0, 0, 0, 0); |
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| 268 | |
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| 269 | #if RAND_SIZE |
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| 270 | struct { |
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| 271 | u8 rnd[RAND_SIZE]; |
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| 272 | u32 seqno; |
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| 273 | } datahdr; |
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| 274 | |
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| 275 | datahdr.seqno = seqno; |
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| 276 | RAND_pseudo_bytes ((unsigned char *) datahdr.rnd, RAND_SIZE); |
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| 277 | |
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| 278 | EVP_EncryptUpdate (cctx, |
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| 279 | (unsigned char *) data + outl, &outl2, |
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| 280 | (unsigned char *) &datahdr, DATAHDR); |
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| 281 | outl += outl2; |
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| 282 | #else |
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| 283 | EVP_EncryptUpdate (cctx, |
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| 284 | (unsigned char *) data + outl, &outl2, |
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| 285 | (unsigned char *) &seqno, DATAHDR); |
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| 286 | outl += outl2; |
|
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| 287 | #endif |
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| 288 | |
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| 289 | EVP_EncryptUpdate (cctx, |
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| 290 | (unsigned char *) data + outl, &outl2, |
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| 291 | (unsigned char *) d, l); |
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| 292 | outl += outl2; |
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| 293 | |
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| 294 | EVP_EncryptFinal_ex (cctx, (unsigned char *) data + outl, &outl2); |
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| 295 | outl += outl2; |
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| 296 | |
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| 297 | len = outl + data_hdr_size (); |
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| 298 | |
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| 299 | set_hdr (type, dst); |
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| 300 | |
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| 301 | hmac_set (conn->octx); |
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| 302 | } |
|
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| 303 | |
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| 304 | tap_packet * |
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| 305 | vpndata_packet::unpack (connection *conn, u32 &seqno) |
|
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| 306 | { |
|
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| 307 | EVP_CIPHER_CTX *cctx = &conn->ictx->cctx; |
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| 308 | int outl = 0, outl2; |
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| 309 | tap_packet *p = new tap_packet; |
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| 310 | u8 *d; |
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| 311 | u32 l = len - data_hdr_size (); |
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| 312 | |
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| 313 | EVP_DecryptInit_ex (cctx, 0, 0, 0, 0); |
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| 314 | |
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| 315 | #if ENABLE_COMPRESSION |
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| 316 | u8 cdata[MAX_MTU]; |
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| 317 | |
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| 318 | if (type == PT_DATA_COMPRESSED) |
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| 319 | d = cdata; |
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| 320 | else |
|
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| 321 | #endif |
|
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| 322 | d = &(*p)[6 + 6 - DATAHDR]; |
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| 323 | |
|
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| 324 | /* this overwrites part of the src mac, but we fix that later */ |
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| 325 | EVP_DecryptUpdate (cctx, |
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| 326 | d, &outl2, |
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| 327 | (unsigned char *)&data, len - data_hdr_size ()); |
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| 328 | outl += outl2; |
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| 329 | |
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| 330 | EVP_DecryptFinal_ex (cctx, (unsigned char *)d + outl, &outl2); |
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| 331 | outl += outl2; |
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| 332 | |
|
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| 333 | seqno = *(u32 *)(d + RAND_SIZE); |
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| 334 | |
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| 335 | id2mac (dst () ? dst() : THISNODE->id, p->dst); |
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| 336 | id2mac (src (), p->src); |
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| 337 | |
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| 338 | #if ENABLE_COMPRESSION |
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| 339 | if (type == PT_DATA_COMPRESSED) |
|
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| 340 | { |
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| 341 | u32 cl = (d[DATAHDR] << 8) | d[DATAHDR + 1]; |
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| 342 | p->len = lzf_decompress (d + DATAHDR + 2, cl, &(*p)[6 + 6], MAX_MTU) + 6 + 6; |
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| 343 | //printf ("decompressxed %d(%d) => %d\n", cl, len - data_hdr_size (), p->len);//D |
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| 344 | } |
|
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| 345 | else |
|
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| 346 | p->len = outl + (6 + 6 - DATAHDR); |
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| 347 | #endif |
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| 348 | |
|
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| 349 | return p; |
|
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| 350 | } |
|
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| 351 | |
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| 352 | struct ping_packet : vpn_packet |
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| 353 | { |
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| 354 | void setup (int dst, ptype type) |
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| 355 | { |
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| 356 | set_hdr (type, dst); |
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| 357 | len = sizeof (*this) - sizeof (net_packet); |
|
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| 358 | } |
|
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| 359 | }; |
|
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| 360 | |
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| 361 | struct config_packet : vpn_packet |
|
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| 362 | { |
|
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| 363 | // actually, hmaclen cannot be checked because the hmac |
|
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| 364 | // field comes before this data, so peers with other |
|
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| 365 | // hmacs simply will not work. |
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| 366 | u8 prot_major, prot_minor, randsize, hmaclen; |
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| 367 | u8 flags, challengelen, pad2, pad3; |
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| 368 | u32 cipher_nid; |
|
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| 369 | u32 digest_nid; |
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| 370 | |
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| 371 | const u8 curflags () const |
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| 372 | { |
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| 373 | return 0x80 |
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| 374 | | (ENABLE_COMPRESSION ? 0x01 : 0x00) |
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| 375 | | (ENABLE_TRUST ? 0x02 : 0x00); |
|
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| 376 | } |
|
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| 377 | |
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| 378 | void setup (ptype type, int dst) |
|
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| 379 | { |
|
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| 380 | prot_major = PROTOCOL_MAJOR; |
|
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| 381 | prot_minor = PROTOCOL_MINOR; |
|
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| 382 | randsize = RAND_SIZE; |
|
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| 383 | hmaclen = HMACLENGTH; |
|
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| 384 | flags = curflags (); |
|
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| 385 | challengelen = sizeof (rsachallenge); |
|
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| 386 | |
|
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| 387 | cipher_nid = htonl (EVP_CIPHER_nid (CIPHER)); |
|
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| 388 | digest_nid = htonl (EVP_MD_type (DIGEST)); |
|
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| 389 | |
|
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| 390 | len = sizeof (*this) - sizeof (net_packet); |
|
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| 391 | set_hdr (type, dst); |
|
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| 392 | } |
|
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| 393 | |
|
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| 394 | bool chk_config () |
|
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| 395 | { |
|
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| 396 | return prot_major == PROTOCOL_MAJOR |
|
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| 397 | && randsize == RAND_SIZE |
|
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| 398 | && hmaclen == HMACLENGTH |
|
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| 399 | && flags == curflags () |
|
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| 400 | && challengelen == sizeof (rsachallenge) |
|
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| 401 | && cipher_nid == htonl (EVP_CIPHER_nid (CIPHER)) |
|
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| 402 | && digest_nid == htonl (EVP_MD_type (DIGEST)); |
|
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| 403 | } |
|
|
| 404 | }; |
|
|
| 405 | |
|
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| 406 | struct auth_packet : config_packet |
|
|
| 407 | { |
|
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| 408 | char magic[8]; |
|
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| 409 | u8 subtype; |
|
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| 410 | u8 pad1, pad2; |
|
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| 411 | rsaencrdata challenge; |
|
|
| 412 | |
|
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| 413 | auth_packet (int dst, auth_subtype stype) |
|
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| 414 | { |
|
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| 415 | config_packet::setup (PT_AUTH, dst); |
|
|
| 416 | subtype = stype; |
|
|
| 417 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 418 | strncpy (magic, MAGIC, 8); |
|
|
| 419 | } |
|
|
| 420 | }; |
|
|
| 421 | |
|
|
| 422 | struct connect_req_packet : vpn_packet |
|
|
| 423 | { |
|
|
| 424 | u8 id; |
|
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| 425 | u8 pad1, pad2, pad3; |
|
|
| 426 | |
|
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| 427 | connect_req_packet (int dst, int id) |
|
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| 428 | { |
|
|
| 429 | this->id = id; |
|
|
| 430 | set_hdr (PT_CONNECT_REQ, dst); |
|
|
| 431 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 432 | } |
|
|
| 433 | }; |
|
|
| 434 | |
|
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| 435 | struct connect_info_packet : vpn_packet |
|
|
| 436 | { |
|
|
| 437 | u8 id; |
|
|
| 438 | u8 pad1, pad2, pad3; |
|
|
| 439 | sockinfo si; |
|
|
| 440 | |
|
|
| 441 | connect_info_packet (int dst, int id, sockinfo &si) |
|
|
| 442 | { |
|
|
| 443 | this->id = id; |
|
|
| 444 | this->si = si; |
|
|
| 445 | set_hdr (PT_CONNECT_INFO, dst); |
|
|
| 446 | len = sizeof (*this) - sizeof (net_packet); |
|
|
| 447 | } |
|
|
| 448 | }; |
|
|
| 449 | |
|
|
| 450 | ///////////////////////////////////////////////////////////////////////////// |
|
|
| 451 | |
|
|
| 452 | void |
|
|
| 453 | fill_sa (SOCKADDR *sa, conf_node *conf) |
|
|
| 454 | { |
|
|
| 455 | sa->sin_family = AF_INET; |
|
|
| 456 | sa->sin_port = htons (conf->port); |
|
|
| 457 | sa->sin_addr.s_addr = 0; |
|
|
| 458 | |
|
|
| 459 | if (conf->hostname) |
|
|
| 460 | { |
|
|
| 461 | struct hostent *he = gethostbyname (conf->hostname); |
|
|
| 462 | |
|
|
| 463 | if (he |
|
|
| 464 | && he->h_addrtype == AF_INET && he->h_length == 4 && he->h_addr_list[0]) |
|
|
| 465 | { |
|
|
| 466 | //sa->sin_family = he->h_addrtype; |
|
|
| 467 | memcpy (&sa->sin_addr, he->h_addr_list[0], 4); |
|
|
| 468 | } |
|
|
| 469 | else |
|
|
| 470 | slog (L_NOTICE, _("unable to resolve host '%s'"), conf->hostname); |
|
|
| 471 | } |
|
|
| 472 | } |
|
|
| 473 | |
|
|
| 474 | void |
|
|
| 475 | connection::reset_dstaddr () |
|
|
| 476 | { |
|
|
| 477 | fill_sa (&sa, conf); |
|
|
| 478 | } |
|
|
| 479 | |
|
|
| 480 | void |
|
|
| 481 | connection::send_ping (SOCKADDR *dsa, u8 pong) |
|
|
| 482 | { |
|
|
| 483 | ping_packet *pkt = new ping_packet; |
|
|
| 484 | |
|
|
| 485 | pkt->setup (conf->id, pong ? ping_packet::PT_PONG : ping_packet::PT_PING); |
|
|
| 486 | vpn->send_vpn_packet (pkt, dsa, IPTOS_LOWDELAY); |
|
|
| 487 | |
|
|
| 488 | delete pkt; |
|
|
| 489 | } |
|
|
| 490 | |
|
|
| 491 | void |
|
|
| 492 | connection::send_reset (SOCKADDR *dsa) |
|
|
| 493 | { |
|
|
| 494 | static net_rate_limiter limiter(1); |
|
|
| 495 | |
|
|
| 496 | if (limiter.can (dsa)) |
|
|
| 497 | { |
|
|
| 498 | config_packet *pkt = new config_packet; |
|
|
| 499 | |
|
|
| 500 | pkt->setup (vpn_packet::PT_RESET, conf->id); |
|
|
| 501 | vpn->send_vpn_packet (pkt, dsa, IPTOS_MINCOST); |
|
|
| 502 | |
|
|
| 503 | delete pkt; |
|
|
| 504 | } |
|
|
| 505 | } |
|
|
| 506 | |
|
|
| 507 | static rsachallenge * |
|
|
| 508 | gen_challenge (SOCKADDR *sa) |
|
|
| 509 | { |
|
|
| 510 | static rsachallenge k; |
|
|
| 511 | |
|
|
| 512 | memcpy (&k, &challenge_bytes (), sizeof (k)); |
|
|
| 513 | RAND_bytes ((unsigned char *)&k[CHG_SEQNO], sizeof (u32)); |
|
|
| 514 | xor_sa (k, sa); |
|
|
| 515 | |
|
|
| 516 | return &k; |
|
|
| 517 | } |
|
|
| 518 | |
|
|
| 519 | void |
|
|
| 520 | connection::send_auth (auth_subtype subtype, SOCKADDR *sa, rsachallenge *k) |
|
|
| 521 | { |
|
|
| 522 | static net_rate_limiter limiter(2); |
|
|
| 523 | |
|
|
| 524 | if (subtype != AUTH_INIT || limiter.can (sa)) |
|
|
| 525 | { |
|
|
| 526 | auth_packet *pkt = new auth_packet (conf->id, subtype); |
|
|
| 527 | |
|
|
| 528 | //printf ("send auth_packet subtype %d\n", subtype);//D |
|
|
| 529 | |
|
|
| 530 | if (!k) |
|
|
| 531 | k = gen_challenge (sa); |
|
|
| 532 | |
|
|
| 533 | #if ENABLE_TRUST |
|
|
| 534 | if (0 > RSA_public_encrypt (sizeof (*k), |
|
|
| 535 | (unsigned char *)k, (unsigned char *)&pkt->challenge, |
|
|
| 536 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 537 | fatal ("RSA_public_encrypt error"); |
|
|
| 538 | #else |
|
|
| 539 | # error untrusted mode not yet implemented: programemr does not know how to |
|
|
| 540 | rsaencrdata enc; |
|
|
| 541 | |
|
|
| 542 | if (0 > RSA_private_encrypt (sizeof (*k), |
|
|
| 543 | (unsigned char *)k, (unsigned char *)&enc, |
|
|
| 544 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 545 | fatal ("RSA_private_encrypt error"); |
|
|
| 546 | |
|
|
| 547 | if (0 > RSA_public_encrypt (sizeof (enc), |
|
|
| 548 | (unsigned char *)enc, (unsigned char *)&pkt->challenge, |
|
|
| 549 | conf->rsa_key, RSA_NO_PADDING)) |
|
|
| 550 | fatal ("RSA_public_encrypt error"); |
|
|
| 551 | #endif |
|
|
| 552 | |
|
|
| 553 | slog (L_TRACE, ">>%d PT_AUTH(%d) [%s]", conf->id, subtype, (const char *)sockinfo (sa)); |
|
|
| 554 | |
|
|
| 555 | vpn->send_vpn_packet (pkt, sa, IPTOS_RELIABILITY); |
|
|
| 556 | |
|
|
| 557 | delete pkt; |
|
|
| 558 | } |
|
|
| 559 | } |
|
|
| 560 | |
|
|
| 561 | void |
|
|
| 562 | connection::establish_connection () |
|
|
| 563 | { |
|
|
| 564 | if (!ictx && conf != THISNODE && connectmode != conf_node::C_NEVER) |
|
|
| 565 | { |
|
|
| 566 | if (now >= next_retry) |
|
|
| 567 | { |
|
|
| 568 | int retry_int = retry_cnt & 3 ? (retry_cnt & 3) : 1 << (retry_cnt >> 2); |
|
|
| 569 | |
|
|
| 570 | if (retry_cnt < (17 << 2) | 3) |
|
|
| 571 | retry_cnt++; |
|
|
| 572 | |
|
|
| 573 | if (connectmode == conf_node::C_ONDEMAND |
|
|
| 574 | && retry_int > ::conf.keepalive) |
|
|
| 575 | retry_int = ::conf.keepalive; |
|
|
| 576 | |
|
|
| 577 | next_retry = now + retry_int; |
|
|
| 578 | next_wakeup (next_retry); |
|
|
| 579 | |
|
|
| 580 | if (conf->hostname) |
|
|
| 581 | { |
|
|
| 582 | reset_dstaddr (); |
|
|
| 583 | if (sa.sin_addr.s_addr) |
|
|
| 584 | if (retry_cnt < 4) |
|
|
| 585 | send_auth (AUTH_INIT, &sa); |
|
|
| 586 | else |
|
|
| 587 | send_ping (&sa, 0); |
|
|
| 588 | } |
|
|
| 589 | else |
|
|
| 590 | vpn->connect_request (conf->id); |
|
|
| 591 | } |
|
|
| 592 | } |
|
|
| 593 | } |
|
|
| 594 | |
|
|
| 595 | void |
|
|
| 596 | connection::reset_connection () |
|
|
| 597 | { |
|
|
| 598 | if (ictx && octx) |
|
|
| 599 | { |
|
|
| 600 | slog (L_INFO, _("connection to %d (%s) lost"), conf->id, conf->nodename); |
|
|
| 601 | |
|
|
| 602 | if (::conf.script_node_down) |
|
|
| 603 | run_script (this, &connection::script_node_down, false); |
|
|
| 604 | } |
|
|
| 605 | |
|
|
| 606 | delete ictx; |
|
|
| 607 | ictx = 0; |
|
|
| 608 | |
|
|
| 609 | delete octx; |
|
|
| 610 | octx = 0; |
|
|
| 611 | |
|
|
| 612 | sa.sin_port = 0; |
|
|
| 613 | sa.sin_addr.s_addr = 0; |
|
|
| 614 | |
|
|
| 615 | next_retry = 0; |
|
|
| 616 | next_rekey = 0; |
|
|
| 617 | last_activity = 0; |
|
|
| 618 | } |
|
|
| 619 | |
|
|
| 620 | void |
|
|
| 621 | connection::shutdown () |
|
|
| 622 | { |
|
|
| 623 | if (ictx && octx) |
|
|
| 624 | send_reset (&sa); |
|
|
| 625 | |
|
|
| 626 | reset_connection (); |
|
|
| 627 | } |
|
|
| 628 | |
|
|
| 629 | void |
|
|
| 630 | connection::rekey () |
|
|
| 631 | { |
|
|
| 632 | reset_connection (); |
|
|
| 633 | establish_connection (); |
|
|
| 634 | } |
|
|
| 635 | |
|
|
| 636 | void |
|
|
| 637 | connection::send_data_packet (tap_packet * pkt, bool broadcast) |
|
|
| 638 | { |
|
|
| 639 | vpndata_packet *p = new vpndata_packet; |
|
|
| 640 | int tos = 0; |
|
|
| 641 | |
|
|
| 642 | if (conf->inherit_tos |
|
|
| 643 | && (*pkt)[12] == 0x08 && (*pkt)[13] == 0x00 // IP |
|
|
| 644 | && ((*pkt)[14] & 0xf0) == 0x40) // IPv4 |
|
|
| 645 | tos = (*pkt)[15] & IPTOS_TOS_MASK; |
|
|
| 646 | printf ("%d %02x %02x %02x %02x = %02x\n", (int)conf->inherit_tos, (*pkt)[12],(*pkt)[13],(*pkt)[14],(*pkt)[15], tos); |
|
|
| 647 | |
|
|
| 648 | p->setup (this, broadcast ? 0 : conf->id, &((*pkt)[6 + 6]), pkt->len - 6 - 6, ++oseqno); // skip 2 macs |
|
|
| 649 | vpn->send_vpn_packet (p, &sa, tos); |
|
|
| 650 | |
|
|
| 651 | delete p; |
|
|
| 652 | |
|
|
| 653 | if (oseqno > MAX_SEQNO) |
|
|
| 654 | rekey (); |
|
|
| 655 | } |
|
|
| 656 | |
|
|
| 657 | void |
|
|
| 658 | connection::inject_data_packet (tap_packet *pkt, bool broadcast) |
|
|
| 659 | { |
|
|
| 660 | if (ictx && octx) |
|
|
| 661 | send_data_packet (pkt, broadcast); |
|
|
| 662 | else |
|
|
| 663 | { |
|
|
| 664 | if (!broadcast)//DDDD |
|
|
| 665 | queue.put (new tap_packet (*pkt)); |
|
|
| 666 | |
|
|
| 667 | establish_connection (); |
|
|
| 668 | } |
|
|
| 669 | } |
|
|
| 670 | |
|
|
| 671 | void |
|
|
| 672 | connection::recv_vpn_packet (vpn_packet *pkt, SOCKADDR *ssa) |
|
|
| 673 | { |
|
|
| 674 | last_activity = now; |
|
|
| 675 | |
|
|
| 676 | slog (L_NOISE, "<<%d received packet type %d from %d to %d", |
|
|
| 677 | conf->id, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
| 678 | |
|
|
| 679 | switch (pkt->typ ()) |
|
|
| 680 | { |
|
|
| 681 | case vpn_packet::PT_PING: |
|
|
| 682 | send_ping (ssa, 1); // pong |
|
|
| 683 | break; |
|
|
| 684 | |
|
|
| 685 | case vpn_packet::PT_PONG: |
|
|
| 686 | // we send pings instead of auth packets after some retries, |
|
|
| 687 | // so reset the retry counter and establish a conenction |
|
|
| 688 | // when we receive a pong. |
|
|
| 689 | if (!ictx && !octx) |
|
|
| 690 | { |
|
|
| 691 | retry_cnt = 0; |
|
|
| 692 | next_retry = 0; |
|
|
| 693 | establish_connection (); |
|
|
| 694 | } |
|
|
| 695 | |
|
|
| 696 | break; |
|
|
| 697 | |
|
|
| 698 | case vpn_packet::PT_RESET: |
|
|
| 699 | { |
|
|
| 700 | reset_connection (); |
|
|
| 701 | |
|
|
| 702 | config_packet *p = (config_packet *) pkt; |
|
|
| 703 | if (p->chk_config ()) |
|
|
| 704 | if (connectmode == conf_node::C_ALWAYS) |
|
|
| 705 | establish_connection (); |
|
|
| 706 | |
|
|
| 707 | //D slog the protocol mismatch? |
|
|
| 708 | } |
|
|
| 709 | break; |
|
|
| 710 | |
|
|
| 711 | case vpn_packet::PT_AUTH: |
|
|
| 712 | { |
|
|
| 713 | auth_packet *p = (auth_packet *) pkt; |
|
|
| 714 | |
|
|
| 715 | slog (L_TRACE, "<<%d PT_AUTH(%d)", conf->id, p->subtype); |
|
|
| 716 | |
|
|
| 717 | if (p->chk_config () |
|
|
| 718 | && !strncmp (p->magic, MAGIC, 8)) |
|
|
| 719 | { |
|
|
| 720 | if (p->prot_minor != PROTOCOL_MINOR) |
|
|
| 721 | slog (L_INFO, _("protocol minor version mismatch: ours is %d, %s's is %d."), |
|
|
| 722 | PROTOCOL_MINOR, conf->nodename, p->prot_minor); |
|
|
| 723 | |
|
|
| 724 | if (p->subtype == AUTH_INIT) |
|
|
| 725 | send_auth (AUTH_INITREPLY, ssa); |
|
|
| 726 | |
|
|
| 727 | rsachallenge k; |
|
|
| 728 | |
|
|
| 729 | #if ENABLE_TRUST |
|
|
| 730 | if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
|
|
| 731 | (unsigned char *)&p->challenge, (unsigned char *)&k, |
|
|
| 732 | ::conf.rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 733 | // continued below |
|
|
| 734 | #else |
|
|
| 735 | rsaencrdata j; |
|
|
| 736 | |
|
|
| 737 | if (0 > RSA_private_decrypt (sizeof (rsaencrdata), |
|
|
| 738 | (unsigned char *)&p->challenge, (unsigned char *)&j, |
|
|
| 739 | ::conf.rsa_key, RSA_NO_PADDING)) |
|
|
| 740 | fatal ("RSA_private_decrypt error"); |
|
|
| 741 | |
|
|
| 742 | if (0 > RSA_public_decrypt (sizeof (k), |
|
|
| 743 | (unsigned char *)&j, (unsigned char *)&k, |
|
|
| 744 | conf->rsa_key, RSA_PKCS1_OAEP_PADDING)) |
|
|
| 745 | // continued below |
|
|
| 746 | #endif |
|
|
| 747 | { |
|
|
| 748 | slog (L_ERR, _("challenge from %s (%s) illegal or corrupted"), |
|
|
| 749 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 750 | break; |
|
|
| 751 | } |
|
|
| 752 | |
|
|
| 753 | retry_cnt = 0; |
|
|
| 754 | next_retry = now + 8; |
|
|
| 755 | |
|
|
| 756 | switch (p->subtype) |
|
|
| 757 | { |
|
|
| 758 | case AUTH_INIT: |
|
|
| 759 | case AUTH_INITREPLY: |
|
|
| 760 | delete ictx; |
|
|
| 761 | ictx = 0; |
|
|
| 762 | |
|
|
| 763 | delete octx; |
|
|
| 764 | |
|
|
| 765 | octx = new crypto_ctx (k, 1); |
|
|
| 766 | oseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; |
|
|
| 767 | |
|
|
| 768 | send_auth (AUTH_REPLY, ssa, &k); |
|
|
| 769 | break; |
|
|
| 770 | |
|
|
| 771 | case AUTH_REPLY: |
|
|
| 772 | |
|
|
| 773 | if (!memcmp ((u8 *)gen_challenge (ssa) + sizeof (u32), (u8 *)&k + sizeof (u32), |
|
|
| 774 | sizeof (rsachallenge) - sizeof (u32))) |
|
|
| 775 | { |
|
|
| 776 | delete ictx; |
|
|
| 777 | |
|
|
| 778 | ictx = new crypto_ctx (k, 0); |
|
|
| 779 | iseqno = *(u32 *)&k[CHG_SEQNO] & 0x7fffffff; // at least 2**31 sequence numbers are valid |
|
|
| 780 | ismask = 0xffffffff; // initially, all lower sequence numbers are invalid |
|
|
| 781 | |
|
|
| 782 | sa = *ssa; |
|
|
| 783 | |
|
|
| 784 | next_rekey = now + ::conf.rekey; |
|
|
| 785 | next_wakeup (next_rekey); |
|
|
| 786 | |
|
|
| 787 | // send queued packets |
|
|
| 788 | while (tap_packet *p = queue.get ()) |
|
|
| 789 | { |
|
|
| 790 | send_data_packet (p); |
|
|
| 791 | delete p; |
|
|
| 792 | } |
|
|
| 793 | |
|
|
| 794 | connectmode = conf->connectmode; |
|
|
| 795 | |
|
|
| 796 | slog (L_INFO, _("connection to %d (%s %s) established"), |
|
|
| 797 | conf->id, conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 798 | |
|
|
| 799 | if (::conf.script_node_up) |
|
|
| 800 | run_script (this, &connection::script_node_up, false); |
|
|
| 801 | } |
|
|
| 802 | else |
|
|
| 803 | slog (L_ERR, _("sent and received challenge do not match with (%s %s))"), |
|
|
| 804 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 805 | |
|
|
| 806 | break; |
|
|
| 807 | default: |
|
|
| 808 | slog (L_ERR, _("authentification illegal subtype error (%s %s)"), |
|
|
| 809 | conf->nodename, (const char *)sockinfo (ssa)); |
|
|
| 810 | break; |
|
|
| 811 | } |
|
|
| 812 | } |
|
|
| 813 | else |
|
|
| 814 | send_reset (ssa); |
|
|
| 815 | |
|
|
| 816 | break; |
|
|
| 817 | } |
|
|
| 818 | |
|
|
| 819 | case vpn_packet::PT_DATA_COMPRESSED: |
|
|
| 820 | #if !ENABLE_COMPRESSION |
|
|
| 821 | send_reset (ssa); |
|
|
| 822 | break; |
|
|
| 823 | #endif |
|
|
| 824 | case vpn_packet::PT_DATA_UNCOMPRESSED: |
|
|
| 825 | |
|
|
| 826 | if (ictx && octx) |
|
|
| 827 | { |
|
|
| 828 | vpndata_packet *p = (vpndata_packet *)pkt; |
|
|
| 829 | |
|
|
| 830 | if (*ssa == sa) |
|
|
| 831 | { |
|
|
| 832 | if (!p->hmac_chk (ictx)) |
|
|
| 833 | slog (L_ERR, _("hmac authentication error, received invalid packet\n" |
|
|
| 834 | "could be an attack, or just corruption or an synchronization error")); |
|
|
| 835 | else |
|
|
| 836 | { |
|
|
| 837 | u32 seqno; |
|
|
| 838 | tap_packet *d = p->unpack (this, seqno); |
|
|
| 839 | |
|
|
| 840 | if (seqno <= iseqno - 32) |
|
|
| 841 | slog (L_ERR, _("received duplicate or outdated packet (received %08lx, expected %08lx)\n" |
|
|
| 842 | "possible replay attack, or just massive packet reordering"), seqno, iseqno + 1);//D |
|
|
| 843 | else if (seqno > iseqno + 32) |
|
|
| 844 | slog (L_ERR, _("received duplicate or out-of-sync packet (received %08lx, expected %08lx)\n" |
|
|
| 845 | "possible replay attack, or just massive packet loss"), seqno, iseqno + 1);//D |
|
|
| 846 | else |
|
|
| 847 | { |
|
|
| 848 | if (seqno > iseqno) |
|
|
| 849 | { |
|
|
| 850 | ismask <<= seqno - iseqno; |
|
|
| 851 | iseqno = seqno; |
|
|
| 852 | } |
|
|
| 853 | |
|
|
| 854 | u32 mask = 1 << (iseqno - seqno); |
|
|
| 855 | |
|
|
| 856 | //printf ("received seqno %08lx, iseqno %08lx, mask %08lx is %08lx\n", seqno, iseqno, mask, ismask); |
|
|
| 857 | if (ismask & mask) |
|
|
| 858 | slog (L_ERR, _("received duplicate packet (received %08lx, expected %08lx)\n" |
|
|
| 859 | "possible replay attack, or just packet duplication"), seqno, iseqno + 1);//D |
|
|
| 860 | else |
|
|
| 861 | { |
|
|
| 862 | ismask |= mask; |
|
|
| 863 | |
|
|
| 864 | vpn->tap->send (d); |
|
|
| 865 | |
|
|
| 866 | if (p->dst () == 0) // re-broadcast |
|
|
| 867 | for (vpn::conns_vector::iterator i = vpn->conns.begin (); i != vpn->conns.end (); ++i) |
|
|
| 868 | { |
|
|
| 869 | connection *c = *i; |
|
|
| 870 | |
|
|
| 871 | if (c->conf != THISNODE && c->conf != conf) |
|
|
| 872 | c->inject_data_packet (d); |
|
|
| 873 | } |
|
|
| 874 | |
|
|
| 875 | delete d; |
|
|
| 876 | |
|
|
| 877 | break; |
|
|
| 878 | } |
|
|
| 879 | } |
|
|
| 880 | } |
|
|
| 881 | } |
|
|
| 882 | else |
|
|
| 883 | slog (L_ERR, _("received data packet from unknown source %s"), (const char *)sockinfo (ssa));//D |
|
|
| 884 | } |
|
|
| 885 | |
|
|
| 886 | send_reset (ssa); |
|
|
| 887 | break; |
|
|
| 888 | |
|
|
| 889 | case vpn_packet::PT_CONNECT_REQ: |
|
|
| 890 | if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
|
|
| 891 | { |
|
|
| 892 | connect_req_packet *p = (connect_req_packet *) pkt; |
|
|
| 893 | |
|
|
| 894 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
|
|
| 895 | |
|
|
| 896 | connection *c = vpn->conns[p->id - 1]; |
|
|
| 897 | |
|
|
| 898 | slog (L_TRACE, "<<%d PT_CONNECT_REQ(%d) [%d]\n", |
|
|
| 899 | conf->id, p->id, c->ictx && c->octx); |
|
|
| 900 | |
|
|
| 901 | if (c->ictx && c->octx) |
|
|
| 902 | { |
|
|
| 903 | // send connect_info packets to both sides, in case one is |
|
|
| 904 | // behind a nat firewall (or both ;) |
|
|
| 905 | { |
|
|
| 906 | sockinfo si(sa); |
|
|
| 907 | |
|
|
| 908 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
|
|
| 909 | c->conf->id, conf->id, (const char *)si); |
|
|
| 910 | |
|
|
| 911 | connect_info_packet *r = new connect_info_packet (c->conf->id, conf->id, si); |
|
|
| 912 | |
|
|
| 913 | r->hmac_set (c->octx); |
|
|
| 914 | vpn->send_vpn_packet (r, &c->sa); |
|
|
| 915 | |
|
|
| 916 | delete r; |
|
|
| 917 | } |
|
|
| 918 | |
|
|
| 919 | { |
|
|
| 920 | sockinfo si(c->sa); |
|
|
| 921 | |
|
|
| 922 | slog (L_TRACE, ">>%d PT_CONNECT_INFO(%d,%s)\n", |
|
|
| 923 | conf->id, c->conf->id, (const char *)si); |
|
|
| 924 | |
|
|
| 925 | connect_info_packet *r = new connect_info_packet (conf->id, c->conf->id, si); |
|
|
| 926 | |
|
|
| 927 | r->hmac_set (octx); |
|
|
| 928 | vpn->send_vpn_packet (r, &sa); |
|
|
| 929 | |
|
|
| 930 | delete r; |
|
|
| 931 | } |
|
|
| 932 | } |
|
|
| 933 | } |
|
|
| 934 | |
|
|
| 935 | break; |
|
|
| 936 | |
|
|
| 937 | case vpn_packet::PT_CONNECT_INFO: |
|
|
| 938 | if (ictx && octx && *ssa == sa && pkt->hmac_chk (ictx)) |
|
|
| 939 | { |
|
|
| 940 | connect_info_packet *p = (connect_info_packet *) pkt; |
|
|
| 941 | |
|
|
| 942 | assert (p->id > 0 && p->id <= vpn->conns.size ()); // hmac-auth does not mean we accept anything |
|
|
| 943 | |
|
|
| 944 | connection *c = vpn->conns[p->id - 1]; |
|
|
| 945 | |
|
|
| 946 | slog (L_TRACE, "<<%d PT_CONNECT_INFO(%d,%s) (%d)", |
|
|
| 947 | conf->id, p->id, (const char *)p->si, !c->ictx && !c->octx); |
|
|
| 948 | |
|
|
| 949 | c->send_auth (AUTH_INIT, p->si.sa ()); |
|
|
| 950 | } |
|
|
| 951 | break; |
|
|
| 952 | |
|
|
| 953 | default: |
|
|
| 954 | send_reset (ssa); |
|
|
| 955 | break; |
|
|
| 956 | } |
|
|
| 957 | } |
|
|
| 958 | |
|
|
| 959 | void connection::timer () |
|
|
| 960 | { |
|
|
| 961 | if (conf != THISNODE) |
|
|
| 962 | { |
|
|
| 963 | if (now >= next_retry && connectmode == conf_node::C_ALWAYS) |
|
|
| 964 | establish_connection (); |
|
|
| 965 | |
|
|
| 966 | if (ictx && octx) |
|
|
| 967 | { |
|
|
| 968 | if (now >= next_rekey) |
|
|
| 969 | rekey (); |
|
|
| 970 | else if (now >= last_activity + ::conf.keepalive + 30) |
|
|
| 971 | { |
|
|
| 972 | reset_connection (); |
|
|
| 973 | establish_connection (); |
|
|
| 974 | } |
|
|
| 975 | else if (now >= last_activity + ::conf.keepalive) |
|
|
| 976 | if (conf->connectmode != conf_node::C_ONDEMAND |
|
|
| 977 | || THISNODE->connectmode != conf_node::C_ONDEMAND) |
|
|
| 978 | send_ping (&sa); |
|
|
| 979 | else |
|
|
| 980 | reset_connection (); |
|
|
| 981 | |
|
|
| 982 | } |
|
|
| 983 | } |
|
|
| 984 | } |
|
|
| 985 | |
|
|
| 986 | void connection::connect_request (int id) |
|
|
| 987 | { |
|
|
| 988 | connect_req_packet *p = new connect_req_packet (conf->id, id); |
|
|
| 989 | |
|
|
| 990 | slog (L_TRACE, ">>%d PT_CONNECT_REQ(%d)", id, conf->id); |
|
|
| 991 | p->hmac_set (octx); |
|
|
| 992 | vpn->send_vpn_packet (p, &sa); |
|
|
| 993 | |
|
|
| 994 | delete p; |
|
|
| 995 | } |
|
|
| 996 | |
|
|
| 997 | void connection::script_node () |
|
|
| 998 | { |
|
|
| 999 | vpn->script_if_up (); |
|
|
| 1000 | |
|
|
| 1001 | char *env; |
|
|
| 1002 | asprintf (&env, "DESTID=%d", conf->id); |
|
|
| 1003 | putenv (env); |
|
|
| 1004 | asprintf (&env, "DESTNODE=%s", conf->nodename); |
|
|
| 1005 | putenv (env); |
|
|
| 1006 | asprintf (&env, "DESTIP=%s", inet_ntoa (sa.sin_addr)); |
|
|
| 1007 | putenv (env); |
|
|
| 1008 | asprintf (&env, "DESTPORT=%d", ntohs (sa.sin_port)); |
|
|
| 1009 | putenv (env); |
|
|
| 1010 | } |
|
|
| 1011 | |
|
|
| 1012 | const char *connection::script_node_up () |
|
|
| 1013 | { |
|
|
| 1014 | script_node (); |
|
|
| 1015 | |
|
|
| 1016 | putenv ("STATE=up"); |
|
|
| 1017 | |
|
|
| 1018 | return ::conf.script_node_up ? ::conf.script_node_up : "node-up"; |
|
|
| 1019 | } |
|
|
| 1020 | |
|
|
| 1021 | const char *connection::script_node_down () |
|
|
| 1022 | { |
|
|
| 1023 | script_node (); |
|
|
| 1024 | |
|
|
| 1025 | putenv ("STATE=down"); |
|
|
| 1026 | |
|
|
| 1027 | return ::conf.script_node_up ? ::conf.script_node_down : "node-down"; |
|
|
| 1028 | } |
|
|
| 1029 | |
|
|
| 1030 | ///////////////////////////////////////////////////////////////////////////// |
|
|
| 1031 | |
|
|
| 1032 | vpn::vpn (void) |
|
|
| 1033 | {} |
|
|
| 1034 | |
|
|
| 1035 | const char *vpn::script_if_up () |
45 | const char *vpn::script_if_up (int) |
| 1036 | { |
46 | { |
| 1037 | // the tunnel device mtu should be the physical mtu - overhead |
47 | // the tunnel device mtu should be the physical mtu - overhead |
| 1038 | // the tricky part is rounding to the cipher key blocksize |
48 | // the tricky part is rounding to the cipher key blocksize |
| 1039 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - UDP_OVERHEAD; |
49 | int mtu = conf.mtu - ETH_OVERHEAD - VPE_OVERHEAD - MAX_OVERHEAD; |
| 1040 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
50 | mtu += ETH_OVERHEAD - 6 - 6; // now we have the data portion |
| 1041 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
51 | mtu -= mtu % EVP_CIPHER_block_size (CIPHER); // round |
| 1042 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
52 | mtu -= ETH_OVERHEAD - 6 - 6; // and get interface mtu again |
| 1043 | |
53 | |
| 1044 | char *env; |
54 | char *env; |
| … | |
… | |
| 1059 | |
69 | |
| 1060 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
70 | return ::conf.script_if_up ? ::conf.script_if_up : "if-up"; |
| 1061 | } |
71 | } |
| 1062 | |
72 | |
| 1063 | int |
73 | int |
| 1064 | vpn::setup (void) |
74 | vpn::setup () |
| 1065 | { |
75 | { |
| 1066 | struct sockaddr_in sa; |
76 | sockinfo si; |
| 1067 | |
77 | |
|
|
78 | si.set (THISNODE); |
|
|
79 | |
|
|
80 | udpv4_fd = -1; |
|
|
81 | |
|
|
82 | if (THISNODE->protocols & PROT_UDPv4) |
|
|
83 | { |
| 1068 | socket_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
84 | udpv4_fd = socket (PF_INET, SOCK_DGRAM, IPPROTO_UDP); |
| 1069 | if (socket_fd < 0) |
85 | |
|
|
86 | if (udpv4_fd < 0) |
| 1070 | return -1; |
87 | return -1; |
| 1071 | |
88 | |
| 1072 | fill_sa (&sa, THISNODE); |
89 | if (bind (udpv4_fd, si.sav4 (), si.salenv4 ())) |
| 1073 | |
90 | { |
| 1074 | if (bind (socket_fd, (sockaddr *)&sa, sizeof (sa))) |
|
|
| 1075 | { |
|
|
| 1076 | slog (L_ERR, _("can't bind to %s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
91 | slog (L_ERR, _("can't bind udpv4 to %s: %s"), (const char *)si, strerror (errno)); |
| 1077 | exit (1); |
92 | exit (1); |
| 1078 | } |
93 | } |
| 1079 | |
94 | |
| 1080 | #ifdef IP_MTU_DISCOVER |
95 | #ifdef IP_MTU_DISCOVER |
| 1081 | // this I really consider a linux bug. I am neither connected |
96 | // this I really consider a linux bug. I am neither connected |
| 1082 | // nor do I fragment myself. Linux still sets DF and doesn't |
97 | // nor do I fragment myself. Linux still sets DF and doesn't |
| 1083 | // fragment for me sometimes. |
98 | // fragment for me sometimes. |
| 1084 | { |
99 | { |
| 1085 | int oval = IP_PMTUDISC_DONT; |
100 | int oval = IP_PMTUDISC_DONT; |
| 1086 | setsockopt (socket_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
101 | setsockopt (udpv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
| 1087 | } |
102 | } |
| 1088 | #endif |
103 | #endif |
| 1089 | { |
104 | |
|
|
105 | // standard daemon practise... |
|
|
106 | { |
| 1090 | int oval = 1; |
107 | int oval = 1; |
| 1091 | setsockopt (socket_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
108 | setsockopt (udpv4_fd, SOL_SOCKET, SO_REUSEADDR, &oval, sizeof oval); |
|
|
109 | } |
|
|
110 | |
|
|
111 | udpv4_ev_watcher.start (udpv4_fd, POLLIN); |
| 1092 | } |
112 | } |
|
|
113 | |
|
|
114 | ipv4_fd = -1; |
|
|
115 | if (THISNODE->protocols & PROT_IPv4) |
|
|
116 | { |
|
|
117 | ipv4_fd = socket (PF_INET, SOCK_RAW, ::conf.ip_proto); |
|
|
118 | |
|
|
119 | if (ipv4_fd < 0) |
|
|
120 | return -1; |
|
|
121 | |
|
|
122 | if (bind (ipv4_fd, si.sav4 (), si.salenv4 ())) |
|
|
123 | { |
|
|
124 | slog (L_ERR, _("can't bind ipv4 socket to %s: %s"), (const char *)si, strerror (errno)); |
|
|
125 | exit (1); |
|
|
126 | } |
|
|
127 | |
|
|
128 | #ifdef IP_MTU_DISCOVER |
|
|
129 | // this I really consider a linux bug. I am neither connected |
|
|
130 | // nor do I fragment myself. Linux still sets DF and doesn't |
|
|
131 | // fragment for me sometimes. |
|
|
132 | { |
|
|
133 | int oval = IP_PMTUDISC_DONT; |
|
|
134 | setsockopt (ipv4_fd, SOL_IP, IP_MTU_DISCOVER, &oval, sizeof oval); |
|
|
135 | } |
|
|
136 | #endif |
|
|
137 | |
|
|
138 | ipv4_ev_watcher.start (ipv4_fd, POLLIN); |
|
|
139 | } |
| 1093 | |
140 | |
| 1094 | tap = new tap_device (); |
141 | tap = new tap_device (); |
| 1095 | if (!tap) //D this, of course, never catches |
142 | if (!tap) //D this, of course, never catches |
| 1096 | { |
143 | { |
| 1097 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
144 | slog (L_ERR, _("cannot create network interface '%s'"), conf.ifname); |
| 1098 | exit (1); |
145 | exit (1); |
| 1099 | } |
146 | } |
| 1100 | |
147 | |
| 1101 | run_script (this, &vpn::script_if_up, true); |
148 | run_script (run_script_cb (this, &vpn::script_if_up), true); |
|
|
149 | |
|
|
150 | tap_ev_watcher.start (tap->fd, POLLIN); |
|
|
151 | |
|
|
152 | reconnect_all (); |
| 1102 | |
153 | |
| 1103 | return 0; |
154 | return 0; |
| 1104 | } |
155 | } |
| 1105 | |
156 | |
| 1106 | void |
157 | void |
| 1107 | vpn::send_vpn_packet (vpn_packet *pkt, SOCKADDR *sa, int tos) |
158 | vpn::send_ipv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
| 1108 | { |
159 | { |
| 1109 | setsockopt (socket_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
160 | setsockopt (ipv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
| 1110 | sendto (socket_fd, &((*pkt)[0]), pkt->len, 0, (sockaddr *)sa, sizeof (*sa)); |
161 | sendto (ipv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
162 | } |
|
|
163 | |
|
|
164 | void |
|
|
165 | vpn::send_udpv4_packet (vpn_packet *pkt, const sockinfo &si, int tos) |
|
|
166 | { |
|
|
167 | setsockopt (udpv4_fd, SOL_IP, IP_TOS, &tos, sizeof tos); |
|
|
168 | sendto (udpv4_fd, &((*pkt)[0]), pkt->len, 0, si.sav4 (), si.salenv4 ()); |
|
|
169 | } |
|
|
170 | |
|
|
171 | void |
|
|
172 | vpn::recv_vpn_packet (vpn_packet *pkt, const sockinfo &rsi) |
|
|
173 | { |
|
|
174 | unsigned int src = pkt->src (); |
|
|
175 | unsigned int dst = pkt->dst (); |
|
|
176 | |
|
|
177 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
178 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
|
|
179 | |
|
|
180 | if (src == 0 || src > conns.size () |
|
|
181 | || dst > conns.size () |
|
|
182 | || pkt->typ () >= vpn_packet::PT_MAX) |
|
|
183 | slog (L_WARN, _("(%s): received corrupted packet type %d (src %d, dst %d)"), |
|
|
184 | (const char *)rsi, pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
185 | else |
|
|
186 | { |
|
|
187 | connection *c = conns[src - 1]; |
|
|
188 | |
|
|
189 | if (dst == 0 && !THISNODE->routerprio) |
|
|
190 | slog (L_WARN, _("%s(%s): received broadcast, but we are no router"), |
|
|
191 | c->conf->nodename, (const char *)rsi); |
|
|
192 | else if (dst != 0 && dst != THISNODE->id) |
|
|
193 | // FORWARDING NEEDED ;) |
|
|
194 | slog (L_WARN, |
|
|
195 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
196 | dst, conns[dst - 1]->conf->nodename, |
|
|
197 | (const char *)rsi, |
|
|
198 | THISNODE->id, THISNODE->nodename); |
|
|
199 | else |
|
|
200 | c->recv_vpn_packet (pkt, rsi); |
|
|
201 | } |
|
|
202 | } |
|
|
203 | |
|
|
204 | void |
|
|
205 | vpn::udpv4_ev (short revents) |
|
|
206 | { |
|
|
207 | if (revents & (POLLIN | POLLERR)) |
|
|
208 | { |
|
|
209 | vpn_packet *pkt = new vpn_packet; |
|
|
210 | struct sockaddr_in sa; |
|
|
211 | socklen_t sa_len = sizeof (sa); |
|
|
212 | int len; |
|
|
213 | |
|
|
214 | len = recvfrom (udpv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
215 | |
|
|
216 | sockinfo si(sa); |
|
|
217 | |
|
|
218 | if (len > 0) |
|
|
219 | { |
|
|
220 | pkt->len = len; |
|
|
221 | |
|
|
222 | recv_vpn_packet (pkt, si); |
|
|
223 | } |
|
|
224 | else |
|
|
225 | { |
|
|
226 | // probably ECONNRESET or somesuch |
|
|
227 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
|
|
228 | } |
|
|
229 | |
|
|
230 | delete pkt; |
|
|
231 | } |
|
|
232 | else if (revents & POLLHUP) |
|
|
233 | { |
|
|
234 | // this cannot ;) happen on udp sockets |
|
|
235 | slog (L_ERR, _("FATAL: POLLHUP on udp v4 fd, terminating.")); |
|
|
236 | exit (1); |
|
|
237 | } |
|
|
238 | else |
|
|
239 | { |
|
|
240 | slog (L_ERR, |
|
|
241 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
242 | revents); |
|
|
243 | exit (1); |
|
|
244 | } |
|
|
245 | } |
|
|
246 | |
|
|
247 | void |
|
|
248 | vpn::ipv4_ev (short revents) |
|
|
249 | { |
|
|
250 | if (revents & (POLLIN | POLLERR)) |
|
|
251 | { |
|
|
252 | vpn_packet *pkt = new vpn_packet; |
|
|
253 | struct sockaddr_in sa; |
|
|
254 | socklen_t sa_len = sizeof (sa); |
|
|
255 | int len; |
|
|
256 | |
|
|
257 | len = recvfrom (ipv4_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
258 | |
|
|
259 | sockinfo si(sa, PROT_IPv4); |
|
|
260 | |
|
|
261 | if (len > 0) |
|
|
262 | { |
|
|
263 | pkt->len = len; |
|
|
264 | |
|
|
265 | // raw sockets deliver the ipv4, but don't expect it on sends |
|
|
266 | // this is slow, but... |
|
|
267 | pkt->skip_hdr (IP_OVERHEAD); |
|
|
268 | |
|
|
269 | recv_vpn_packet (pkt, si); |
|
|
270 | } |
|
|
271 | else |
|
|
272 | { |
|
|
273 | // probably ECONNRESET or somesuch |
|
|
274 | slog (L_DEBUG, _("%s: %s"), (const char *)si, strerror (errno)); |
|
|
275 | } |
|
|
276 | |
|
|
277 | delete pkt; |
|
|
278 | } |
|
|
279 | else if (revents & POLLHUP) |
|
|
280 | { |
|
|
281 | // this cannot ;) happen on udp sockets |
|
|
282 | slog (L_ERR, _("FATAL: POLLHUP on ipv4 fd, terminating.")); |
|
|
283 | exit (1); |
|
|
284 | } |
|
|
285 | else |
|
|
286 | { |
|
|
287 | slog (L_ERR, |
|
|
288 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
289 | revents); |
|
|
290 | exit (1); |
|
|
291 | } |
|
|
292 | } |
|
|
293 | |
|
|
294 | void |
|
|
295 | vpn::tap_ev (short revents) |
|
|
296 | { |
|
|
297 | if (revents & POLLIN) |
|
|
298 | { |
|
|
299 | /* process data */ |
|
|
300 | tap_packet *pkt; |
|
|
301 | |
|
|
302 | pkt = tap->recv (); |
|
|
303 | |
|
|
304 | int dst = mac2id (pkt->dst); |
|
|
305 | int src = mac2id (pkt->src); |
|
|
306 | |
|
|
307 | if (src != THISNODE->id) |
|
|
308 | { |
|
|
309 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
310 | exit (1); |
|
|
311 | } |
|
|
312 | |
|
|
313 | if (dst == THISNODE->id) |
|
|
314 | { |
|
|
315 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
316 | exit (1); |
|
|
317 | } |
|
|
318 | |
|
|
319 | if (dst > conns.size ()) |
|
|
320 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
321 | else |
|
|
322 | { |
|
|
323 | if (dst) |
|
|
324 | { |
|
|
325 | // unicast |
|
|
326 | if (dst != THISNODE->id) |
|
|
327 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
328 | } |
|
|
329 | else |
|
|
330 | { |
|
|
331 | // broadcast, first check router, then self, then english |
|
|
332 | connection *router = find_router (); |
|
|
333 | |
|
|
334 | if (router) |
|
|
335 | router->inject_data_packet (pkt, true); |
|
|
336 | else |
|
|
337 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
|
|
338 | if ((*c)->conf != THISNODE) |
|
|
339 | (*c)->inject_data_packet (pkt); |
|
|
340 | } |
|
|
341 | } |
|
|
342 | |
|
|
343 | delete pkt; |
|
|
344 | } |
|
|
345 | else if (revents & (POLLHUP | POLLERR)) |
|
|
346 | { |
|
|
347 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
348 | exit (1); |
|
|
349 | } |
|
|
350 | else |
|
|
351 | abort (); |
|
|
352 | } |
|
|
353 | |
|
|
354 | void |
|
|
355 | vpn::event_cb (tstamp &ts) |
|
|
356 | { |
|
|
357 | if (events) |
|
|
358 | { |
|
|
359 | if (events & EVENT_SHUTDOWN) |
|
|
360 | { |
|
|
361 | slog (L_INFO, _("preparing shutdown...")); |
|
|
362 | |
|
|
363 | shutdown_all (); |
|
|
364 | |
|
|
365 | remove_pid (pidfilename); |
|
|
366 | |
|
|
367 | slog (L_INFO, _("terminating")); |
|
|
368 | |
|
|
369 | exit (0); |
|
|
370 | } |
|
|
371 | |
|
|
372 | if (events & EVENT_RECONNECT) |
|
|
373 | { |
|
|
374 | slog (L_INFO, _("forced reconnect")); |
|
|
375 | |
|
|
376 | reconnect_all (); |
|
|
377 | } |
|
|
378 | |
|
|
379 | events = 0; |
|
|
380 | } |
|
|
381 | |
|
|
382 | ts = TSTAMP_CANCEL; |
| 1111 | } |
383 | } |
| 1112 | |
384 | |
| 1113 | void |
385 | void |
| 1114 | vpn::shutdown_all () |
386 | vpn::shutdown_all () |
| 1115 | { |
387 | { |
| … | |
… | |
| 1122 | { |
394 | { |
| 1123 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
395 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 1124 | delete *c; |
396 | delete *c; |
| 1125 | |
397 | |
| 1126 | conns.clear (); |
398 | conns.clear (); |
|
|
399 | |
|
|
400 | connection_init (); |
| 1127 | |
401 | |
| 1128 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
402 | for (configuration::node_vector::iterator i = conf.nodes.begin (); |
| 1129 | i != conf.nodes.end (); ++i) |
403 | i != conf.nodes.end (); ++i) |
| 1130 | { |
404 | { |
| 1131 | connection *conn = new connection (this); |
405 | connection *conn = new connection (this); |
| … | |
… | |
| 1171 | // if ((*i)->conf->routerprio) |
445 | // if ((*i)->conf->routerprio) |
| 1172 | // (*i)->establish_connection (); |
446 | // (*i)->establish_connection (); |
| 1173 | } |
447 | } |
| 1174 | |
448 | |
| 1175 | void |
449 | void |
| 1176 | vpn::main_loop () |
450 | connection::dump_status () |
| 1177 | { |
451 | { |
| 1178 | struct pollfd pollfd[2]; |
452 | slog (L_NOTICE, _("node %s (id %d)"), conf->nodename, conf->id); |
|
|
453 | slog (L_NOTICE, _(" connectmode %d (%d) / sockaddr %s / minor %d"), |
|
|
454 | connectmode, conf->connectmode, (const char *)si, (int)prot_minor); |
|
|
455 | slog (L_NOTICE, _(" ictx/octx %08lx/%08lx / oseqno %d / retry_cnt %d"), |
|
|
456 | (long)ictx, (long)octx, (int)oseqno, (int)retry_cnt); |
|
|
457 | slog (L_NOTICE, _(" establish_conn %ld / rekey %ld / keepalive %ld"), |
|
|
458 | (long)(establish_connection.at), (long)(rekey.at), (long)(keepalive.at)); |
|
|
459 | } |
| 1179 | |
460 | |
| 1180 | pollfd[0].fd = tap->fd; |
461 | void |
| 1181 | pollfd[0].events = POLLIN; |
462 | vpn::dump_status () |
| 1182 | pollfd[1].fd = socket_fd; |
463 | { |
| 1183 | pollfd[1].events = POLLIN; |
464 | slog (L_NOTICE, _("BEGIN status dump (%ld)"), (long)NOW); |
| 1184 | |
465 | |
| 1185 | events = 0; |
|
|
| 1186 | now = time (0); |
|
|
| 1187 | next_timecheck = now + 1; |
|
|
| 1188 | |
|
|
| 1189 | reconnect_all (); |
|
|
| 1190 | |
|
|
| 1191 | for (;;) |
|
|
| 1192 | { |
|
|
| 1193 | int npoll = poll (pollfd, 2, (next_timecheck - now) * 1000); |
|
|
| 1194 | |
|
|
| 1195 | now = time (0); |
|
|
| 1196 | |
|
|
| 1197 | if (npoll > 0) |
|
|
| 1198 | { |
|
|
| 1199 | if (pollfd[1].revents) |
|
|
| 1200 | { |
|
|
| 1201 | if (pollfd[1].revents & (POLLIN | POLLERR)) |
|
|
| 1202 | { |
|
|
| 1203 | vpn_packet *pkt = new vpn_packet; |
|
|
| 1204 | struct sockaddr_in sa; |
|
|
| 1205 | socklen_t sa_len = sizeof (sa); |
|
|
| 1206 | int len; |
|
|
| 1207 | |
|
|
| 1208 | len = recvfrom (socket_fd, &((*pkt)[0]), MAXSIZE, 0, (sockaddr *)&sa, &sa_len); |
|
|
| 1209 | |
|
|
| 1210 | if (len > 0) |
|
|
| 1211 | { |
|
|
| 1212 | pkt->len = len; |
|
|
| 1213 | |
|
|
| 1214 | unsigned int src = pkt->src (); |
|
|
| 1215 | unsigned int dst = pkt->dst (); |
|
|
| 1216 | |
|
|
| 1217 | slog (L_NOISE, _("<<?/%s received possible vpn packet type %d from %d to %d, length %d"), |
|
|
| 1218 | (const char *)sockinfo (sa), pkt->typ (), pkt->src (), pkt->dst (), pkt->len); |
|
|
| 1219 | |
|
|
| 1220 | if (dst > conns.size () || pkt->typ () >= vpn_packet::PT_MAX) |
|
|
| 1221 | slog (L_WARN, _("<<? received CORRUPTED packet type %d from %d to %d"), |
|
|
| 1222 | pkt->typ (), pkt->src (), pkt->dst ()); |
|
|
| 1223 | else if (dst == 0 && !THISNODE->routerprio) |
|
|
| 1224 | slog (L_WARN, _("<<%d received broadcast, but we are no router"), dst); |
|
|
| 1225 | else if (dst != 0 && dst != THISNODE->id) |
|
|
| 1226 | slog (L_WARN, |
|
|
| 1227 | _("received frame for node %d ('%s') from %s, but this is node %d ('%s')"), |
|
|
| 1228 | dst, conns[dst - 1]->conf->nodename, |
|
|
| 1229 | (const char *)sockinfo (sa), |
|
|
| 1230 | THISNODE->id, THISNODE->nodename); |
|
|
| 1231 | else if (src == 0 || src > conns.size ()) |
|
|
| 1232 | slog (L_WARN, _("received frame from unknown node %d (%s)"), src, (const char *)sockinfo (sa)); |
|
|
| 1233 | else |
|
|
| 1234 | conns[src - 1]->recv_vpn_packet (pkt, &sa); |
|
|
| 1235 | } |
|
|
| 1236 | else |
|
|
| 1237 | { |
|
|
| 1238 | // probably ECONNRESET or somesuch |
|
|
| 1239 | slog (L_DEBUG, _("%s: %s"), (const char *)sockinfo(sa), strerror (errno)); |
|
|
| 1240 | } |
|
|
| 1241 | |
|
|
| 1242 | delete pkt; |
|
|
| 1243 | } |
|
|
| 1244 | else if (pollfd[1].revents & POLLHUP) |
|
|
| 1245 | { |
|
|
| 1246 | // this cannot ;) happen on udp sockets |
|
|
| 1247 | slog (L_ERR, _("FATAL: POLLHUP on socket fd, terminating.")); |
|
|
| 1248 | exit (1); |
|
|
| 1249 | } |
|
|
| 1250 | else |
|
|
| 1251 | { |
|
|
| 1252 | slog (L_ERR, |
|
|
| 1253 | _("FATAL: unknown revents %08x in socket, terminating\n"), |
|
|
| 1254 | pollfd[1].revents); |
|
|
| 1255 | exit (1); |
|
|
| 1256 | } |
|
|
| 1257 | } |
|
|
| 1258 | |
|
|
| 1259 | // I use else here to give vpn_packets absolute priority |
|
|
| 1260 | else if (pollfd[0].revents) |
|
|
| 1261 | { |
|
|
| 1262 | if (pollfd[0].revents & POLLIN) |
|
|
| 1263 | { |
|
|
| 1264 | /* process data */ |
|
|
| 1265 | tap_packet *pkt; |
|
|
| 1266 | |
|
|
| 1267 | pkt = tap->recv (); |
|
|
| 1268 | |
|
|
| 1269 | int dst = mac2id (pkt->dst); |
|
|
| 1270 | int src = mac2id (pkt->src); |
|
|
| 1271 | |
|
|
| 1272 | if (src != THISNODE->id) |
|
|
| 1273 | { |
|
|
| 1274 | slog (L_ERR, _("FATAL: tap packet not originating on current node received, terminating.")); |
|
|
| 1275 | exit (1); |
|
|
| 1276 | } |
|
|
| 1277 | |
|
|
| 1278 | if (dst == THISNODE->id) |
|
|
| 1279 | { |
|
|
| 1280 | slog (L_ERR, _("FATAL: tap packet destined for current node received, terminating.")); |
|
|
| 1281 | exit (1); |
|
|
| 1282 | } |
|
|
| 1283 | |
|
|
| 1284 | if (dst > conns.size ()) |
|
|
| 1285 | slog (L_ERR, _("tap packet for unknown node %d received, ignoring."), dst); |
|
|
| 1286 | else |
|
|
| 1287 | { |
|
|
| 1288 | if (dst) |
|
|
| 1289 | { |
|
|
| 1290 | // unicast |
|
|
| 1291 | if (dst != THISNODE->id) |
|
|
| 1292 | conns[dst - 1]->inject_data_packet (pkt); |
|
|
| 1293 | } |
|
|
| 1294 | else |
|
|
| 1295 | { |
|
|
| 1296 | // broadcast, first check router, then self, then english |
|
|
| 1297 | connection *router = find_router (); |
|
|
| 1298 | |
|
|
| 1299 | if (router) |
|
|
| 1300 | router->inject_data_packet (pkt, true); |
|
|
| 1301 | else |
|
|
| 1302 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
466 | for (conns_vector::iterator c = conns.begin (); c != conns.end (); ++c) |
| 1303 | if ((*c)->conf != THISNODE) |
467 | (*c)->dump_status (); |
| 1304 | (*c)->inject_data_packet (pkt); |
|
|
| 1305 | } |
|
|
| 1306 | } |
|
|
| 1307 | |
468 | |
| 1308 | delete pkt; |
469 | slog (L_NOTICE, _("END status dump")); |
| 1309 | } |
470 | } |
| 1310 | else if (pollfd[0].revents & (POLLHUP | POLLERR)) |
|
|
| 1311 | { |
|
|
| 1312 | slog (L_ERR, _("FATAL: POLLHUP or POLLERR on network device fd, terminating.")); |
|
|
| 1313 | exit (1); |
|
|
| 1314 | } |
|
|
| 1315 | else |
|
|
| 1316 | abort (); |
|
|
| 1317 | } |
|
|
| 1318 | } |
|
|
| 1319 | |
471 | |
| 1320 | if (events) |
472 | vpn::vpn (void) |
| 1321 | { |
473 | : udpv4_ev_watcher(this, &vpn::udpv4_ev) |
| 1322 | if (events & EVENT_SHUTDOWN) |
474 | , ipv4_ev_watcher(this, &vpn::ipv4_ev) |
| 1323 | { |
475 | , tap_ev_watcher(this, &vpn::tap_ev) |
| 1324 | shutdown_all (); |
476 | , event(this, &vpn::event_cb) |
| 1325 | |
477 | { |
| 1326 | remove_pid (pidfilename); |
|
|
| 1327 | |
|
|
| 1328 | slog (L_INFO, _("vped terminating")); |
|
|
| 1329 | |
|
|
| 1330 | exit (0); |
|
|
| 1331 | } |
|
|
| 1332 | |
|
|
| 1333 | if (events & EVENT_RECONNECT) |
|
|
| 1334 | reconnect_all (); |
|
|
| 1335 | |
|
|
| 1336 | events = 0; |
|
|
| 1337 | } |
|
|
| 1338 | |
|
|
| 1339 | // very very very dumb and crude and inefficient timer handling, or maybe not? |
|
|
| 1340 | if (now >= next_timecheck) |
|
|
| 1341 | { |
|
|
| 1342 | next_timecheck = now + TIMER_GRANULARITY; |
|
|
| 1343 | |
|
|
| 1344 | for (conns_vector::iterator c = conns.begin (); |
|
|
| 1345 | c != conns.end (); ++c) |
|
|
| 1346 | (*c)->timer (); |
|
|
| 1347 | } |
|
|
| 1348 | } |
|
|
| 1349 | } |
478 | } |
| 1350 | |
479 | |
| 1351 | vpn::~vpn () |
480 | vpn::~vpn () |
| 1352 | {} |
481 | { |
|
|
482 | } |
| 1353 | |
483 | |
