src/vpn/gnunet-vpn-pretty-print.c

   1 #include <stdlib.h>
   2 #include <stdio.h>
   3 #include <string.h>
   4 #include <ctype.h>
   5 #include <malloc.h>
   6 #ifndef _WIN32
   7  #include <arpa/inet.h>
   8 #else
   9 #include <ws2tcpip.h>
  10 #endif
  11
  12 #include "gnunet-vpn-packet.h"
  13
  14 static char* pretty = /*{{{*/
  15 /*     0       1         2         3         4        5          6
  16  0123456789012345678901234567890123456789012345678901234567890123456789 */
  17 "IPv6-Paket from xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx    \n" //60
  18 "             to xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx:xxxx    \n" //120
  19 /*     0       1         2         3         4        5          6
  20  0123456789012345678901234567890123456789012345678901234567890123456789 */
  21 "        flow    0xXXX (        )                           \n" //180
  22 "        length  0xXX  (   )                                \n" //240
  23 "        nexthdr 0xXX  (                                    \n" //300
  24 "        hoplmt  0xXX  (   )                                \n" //360
  25 "first 128 bytes of payload:                                \n" //420
  26 /*     0       1         2         3         4        5          6
  27  0123456789012345678901234567890123456789012345678901234567890123456789 */
  28 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //490
  29 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //560
  30 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //630
  31 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //700
  32 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //770
  33 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //840
  34 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n" //910
  35 "XX XX XX XX XX XX XX XX  XX XX XX XX XX XX XX XX | ................  \n";//980
  36 /*}}}*/
  37
  38 static void pp_ip6adr(unsigned char* adr, char* dest) {{{
  39         char tmp[3];
  40
  41         sprintf(tmp, "%02X", adr[0]);
  42         memcpy(dest+0, tmp, 2);
  43         sprintf(tmp, "%02X", adr[1]);
  44         memcpy(dest+2, tmp, 2);
  45
  46         sprintf(tmp, "%02X", adr[2]);
  47         memcpy(dest+5, tmp, 2);
  48         sprintf(tmp, "%02X", adr[3]);
  49         memcpy(dest+7, tmp, 2);
  50
  51         sprintf(tmp, "%02X", adr[4]);
  52         memcpy(dest+10, tmp, 2);
  53         sprintf(tmp, "%02X", adr[5]);
  54         memcpy(dest+12, tmp, 2);
  55
  56         sprintf(tmp, "%02X", adr[6]);
  57         memcpy(dest+15, tmp, 2);
  58         sprintf(tmp, "%02X", adr[7]);
  59         memcpy(dest+17, tmp, 2);
  60
  61         sprintf(tmp, "%02X", adr[8]);
  62         memcpy(dest+20, tmp, 2);
  63         sprintf(tmp, "%02X", adr[9]);
  64         memcpy(dest+22, tmp, 2);
  65
  66         sprintf(tmp, "%02X", adr[10]);
  67         memcpy(dest+25, tmp, 2);
  68         sprintf(tmp, "%02X", adr[11]);
  69         memcpy(dest+27, tmp, 2);
  70
  71         sprintf(tmp, "%02X", adr[12]);
  72         memcpy(dest+30, tmp, 2);
  73         sprintf(tmp, "%02X", adr[13]);
  74         memcpy(dest+32, tmp, 2);
  75
  76         sprintf(tmp, "%02X", adr[14]);
  77         memcpy(dest+35, tmp, 2);
  78         sprintf(tmp, "%02X", adr[15]);
  79         memcpy(dest+37, tmp, 2);
  80 }}}
  81
  82 void pp_hexdump(unsigned char* data, char* dest, int max) {{{
  83         int i;
  84         char tmp[3];
  85         char tmp2[2];
  86         int off = 0;
  87         int to = max > 16 ? 16 : max;
  88         for (i = 0; i < to; i++) {
  89                 if (i == 8) off = 1;
  90                 sprintf(tmp, "%02x", data[i]);
  91                 memcpy(dest+(3*i)+off, tmp, 2);
  92                 if (isprint(data[i])) {
  93                         sprintf(tmp2, "%c", data[i]);
  94                         memcpy(dest+51+i, tmp2, 1);
  95                 }
  96         }
  97 }}}
  98
  99 void pp_write_header(char* dest, struct ip6_pkt* pkt) {{{
 100         switch (pkt->ip6_hdr.nxthdr) {
 101                 case 0x3a:
 102                         memcpy(dest, "ICMPv6)", 7);
 103                         break;
 104                 case 0x06:
 105                         memcpy(dest, "TCP)", 4);
 106                         break;
 107                 case 0x11:
 108                         memcpy(dest, "UDP)", 4);
 109                         break;
 110                 default:
 111                         memcpy(dest, "unknown)", 8);
 112                         break;
 113         }
 114 }}}
 115
 116 void pkt_printf(struct ip6_pkt* pkt) {{{
 117         char* buf = alloca(strlen(pretty)+1);
 118         char tmp[9];
 119
 120         memcpy(buf, pretty, strlen(pretty)+1);
 121
 122         pp_ip6adr(pkt->ip6_hdr.sadr, buf+16);
 123         pp_ip6adr(pkt->ip6_hdr.dadr, buf+76);
 124
 125         int flow = (ntohl(pkt->ip6_hdr.flowlbl));
 126         sprintf(tmp, "%03x", flow);
 127         memcpy(buf+138, tmp, 3);
 128         sprintf(tmp, "%-8d", flow);
 129         memcpy(buf+143, tmp, 8);
 130
 131         int length = ntohs(pkt->ip6_hdr.paylgth);
 132         sprintf(tmp, "%02x", length);
 133         memcpy(buf+198, tmp, 2);
 134         sprintf(tmp, "%-3d", length);
 135         memcpy(buf+203, tmp, 3);
 136
 137         sprintf(tmp, "%02x", pkt->ip6_hdr.nxthdr);
 138         memcpy(buf+258, tmp, 2);
 139         pp_write_header(buf+263, pkt);
 140
 141         sprintf(tmp, "%02x", pkt->ip6_hdr.hoplmt);
 142         memcpy(buf+318, tmp, 2);
 143         sprintf(tmp, "%-3d", pkt->ip6_hdr.hoplmt);
 144         memcpy(buf+323, tmp, 3);
 145
 146         int size = ntohs(pkt->ip6_hdr.paylgth);
 147         int i;
 148         for(i = 0; i < 8; i++) {
 149                 if (16*i > size) break;
 150                 pp_hexdump(pkt->data + (16*i), buf + 420 + (i*70), size - 16*i);
 151         }
 152
 153         printf("%s", buf);
 154 }}}
 155
 156 void pkt_printf_ip6tcp(struct ip6_tcp* pkt) {{{
 157         printf("spt: %u\n", ntohs(pkt->tcp_hdr.spt));
 158         printf("dpt: %u\n", ntohs(pkt->tcp_hdr.dpt));
 159         printf("seq: %u\n", ntohs(pkt->tcp_hdr.seq));
 160         printf("ack: %u\n", ntohs(pkt->tcp_hdr.ack));
 161         printf("off: %u\n", ntohs(pkt->tcp_hdr.off));
 162         printf("wsz: %u\n", ntohs(pkt->tcp_hdr.wsz));
 163         printf("crc: 0x%x\n", ntohs(pkt->tcp_hdr.crc));
 164         printf("urg: %u\n", ntohs(pkt->tcp_hdr.urg));
 165         printf("flags: %c%c%c%c%c%c%c%c\n",
 166                         pkt->tcp_hdr.flg & 0x80 ? 'C' : '.',
 167                         pkt->tcp_hdr.flg & 0x40 ? 'E' : '.',
 168                         pkt->tcp_hdr.flg & 0x20 ? 'U' : '.',
 169                         pkt->tcp_hdr.flg & 0x10 ? 'A' : '.',
 170                         pkt->tcp_hdr.flg & 0x08 ? 'P' : '.',
 171                         pkt->tcp_hdr.flg & 0x04 ? 'R' : '.',
 172                         pkt->tcp_hdr.flg & 0x02 ? 'S' : '.',
 173                         pkt->tcp_hdr.flg & 0x01 ? 'F' : '.'
 174                         );
 175 }}}
 176
 177 void pkt_printf_ip6udp(struct ip6_udp* pkt) {{{
 178         printf("spt: %u\n", ntohs(pkt->udp_hdr.spt));
 179         printf("dpt: %u\n", ntohs(pkt->udp_hdr.dpt));
 180         printf("len: %u\n", ntohs(pkt->udp_hdr.len));
 181         printf("crc: 0x%x\n", ntohs(pkt->udp_hdr.crc));
 182 }}}
 183
 184 static char* dns_types(unsigned short type) {{{
 185         static char* types[] = { /*{{{*/
 186                 "",
 187                 "A",              // 1 a host address
 188                 "NS",             // 2 an authoritative name server
 189                 "MD",             // 3 a mail destination (Obsolete - use MX)
 190                 "MF",             // 4 a mail forwarder (Obsolete - use MX)
 191                 "CNAME",          // 5 the canonical name for an alias
 192                 "SOA",            // 6 marks the start of a zone of authority
 193                 "MB",             // 7 a mailbox domain name (EXPERIMENTAL)
 194                 "MG",             // 8 a mail group member (EXPERIMENTAL)
 195                 "MR",             // 9 a mail rename domain name (EXPERIMENTAL)
 196                 "NULL",           // 10 a null RR (EXPERIMENTAL)
 197                 "WKS",            // 11 a well known service description
 198                 "PTR",            // 12 a domain name pointer
 199                 "HINFO",          // 13 host information
 200                 "MINFO",          // 14 mailbox or mail list information
 201                 "MX",             // 15 mail exchange
 202                 "TXT",            // 16 text strings
 203                 "RP",
 204                 "AFSDB"
 205         }; /*}}}*/
 206
 207         static char* qtypes[] = { /* + 252! {{{ */
 208                 "AXFR",           // 252 A request for a transfer of an entire zone
 209                 "MAILB",          // 253 A request for mailbox-related records (MB, MG or MR)
 210                 "MAILA",          // 254 A request for mail agent RRs (Obsolete - see MX)
 211                 "*",              // 255 A request for all records
 212         }; /*}}}*/
 213
 214         if (type <= 18) return types[type];
 215         if (type >= 252 && type <= 255) return qtypes[type-252];
 216
 217         switch(type) {
 218                 case 24: return "SIG";
 219                 case 25: return "KEY";
 220                 case 28: return "AAAA";
 221                 case 29: return "LOC";
 222                 case 33: return "SRV";
 223                 case 35: return "NAPTR";
 224                 case 36: return "KX";
 225                 case 37: return "CERT";
 226                 case 39: return "DNAME";
 227                 case 42: return "APL";
 228                 case 43: return "DS";
 229                 case 44: return "SSHFP";
 230                 case 45: return "IPSECKEY";
 231                 case 46: return "RRSIG";
 232                 case 47: return "NSEC";
 233                 case 48: return "DNSKEY";
 234                 case 49: return "DHCID";
 235                 case 50: return "NSEC3";
 236                 case 51: return "NSEC3PARAM";
 237                 case 55: return "HIP";
 238                 case 99: return "SPF";
 239                 case 249: return "TKEY";
 240                 case 250: return "TSIG";
 241                 case 32768: return "TA";
 242                 case 32769: return "DLV";
 243         }
 244
 245         return 0;
 246
 247 }}}
 248
 249 static char* dns_classes(short class) {{{
 250         static char* classes[] = { /*{{{*/
 251                 "",
 252                 "IN", // 1 the Internet
 253                 "CS", // 2 the CSNET class (Obsolete - used only for examples in some obsolete RFCs)
 254                 "CH", // 3 the CHAOS class
 255                 "HS", // 4 Hesiod [Dyer 87]
 256         }; /*}}}*/
 257
 258         if (class <= 4) return classes[class];
 259         return 0;
 260 }}}
 261
 262 unsigned int parse_dns_name(unsigned char* d, const unsigned char* src, unsigned short idx) {/*{{{*/
 263         unsigned char* dest = d;
 264
 265         int len = src[idx++];
 266         while (len != 0) {
 267                 if (len & 0xC0) { /* Compressed name, offset in this and the next octet */
 268                         unsigned short offset = ((len & 0x3F) << 8) | src[idx++];
 269                         parse_dns_name(dest, src, offset - 12);
 270                         return idx;
 271                 }
 272                 memcpy(dest, src+idx, len);
 273                 idx += len;
 274                 dest += len;
 275                 *dest = '.';
 276                 dest++;
 277                 len = src[idx++];
 278         };
 279         *dest = 0;
 280
 281         return idx;
 282 }
 283 /*}}}*/
 284
 285 void pkt_printf_dns(struct dns_pkt* pkt) {{{
 286         printf("DNS-Packet:\n");
 287         printf("\tid: %d\n", ntohs(pkt->id));
 288         printf("\t%d: %s\n", pkt->qr, pkt->qr == 0 ? "query" : "response");
 289         printf("\top: %s\n", (char*[]){"query", "inverse q.", "status", "inval"}[pkt->op]);
 290         printf("\trecursion is%s desired\n", pkt->rd == 0 ? " not" : "");
 291         unsigned short qdcount = ntohs(pkt->qdcount);
 292         unsigned short ancount = ntohs(pkt->ancount);
 293         unsigned short nscount = ntohs(pkt->nscount);
 294         unsigned short arcount = ntohs(pkt->arcount);
 295         printf("\t#qd: %d\n", qdcount);
 296         printf("\t#an: %d\n", ancount);
 297         printf("\t#ns: %d\n", nscount);
 298         printf("\t#ar: %d\n", arcount);
 299
 300         struct dns_query** queries = alloca(qdcount*sizeof(struct dns_query*));
 301         struct dns_record** answers = alloca(ancount*sizeof(struct dns_record*));
 302         struct dns_record** nameserver = alloca(nscount*sizeof(struct dns_record*));
 303         struct dns_record** additional = alloca(arcount*sizeof(struct dns_record*));
 304         unsigned short idx = 0;
 305
 306         int i;
 307         for (i = 0; i < qdcount; i++) { /*{{{*/
 308                 queries[i] = alloca(sizeof(struct dns_query));
 309                 queries[i]->name = alloca(255); // see RFC1035
 310                 unsigned char* name = queries[i]->name;
 311
 312                 idx = parse_dns_name(name, pkt->data, idx);
 313
 314                 printf("%d\n", idx);
 315                 queries[i]->qtype = *((unsigned short*)(pkt->data+idx));
 316                 idx += 2;
 317                 queries[i]->qclass = *((unsigned short*)(pkt->data+idx));
 318                 idx += 2;
 319                 printf("query for %s type=%d (%s) class=%d (%s)\n", queries[i]->name, ntohs(queries[i]->qtype), dns_types(ntohs(queries[i]->qtype)), ntohs(queries[i]->qclass), dns_classes(ntohs(queries[i]->qclass)));
 320         }
 321         /*}}}*/
 322         for (i = 0; i < ancount; i++) { /*{{{*/
 323                 answers[i] = alloca(sizeof(struct dns_record));
 324                 answers[i]->name = alloca(255); // see RFC1035
 325                 unsigned char* name = answers[i]->name;
 326
 327                 idx = parse_dns_name(name, pkt->data, idx);
 328
 329                 printf("%d\n", idx);
 330                 answers[i]->type = *((unsigned short*)(pkt->data+idx));
 331                 idx += 2;
 332                 answers[i]->class = *((unsigned short*)(pkt->data+idx));
 333                 idx += 2;
 334                 answers[i]->ttl = *((unsigned int*)(pkt->data+idx));
 335                 idx += 4;
 336                 answers[i]->data_len = *((unsigned short*)(pkt->data+idx));
 337                 idx += 2;
 338                 answers[i]->data = alloca(ntohs(answers[i]->data_len));
 339                 memcpy(answers[i]->data, pkt->data+idx, ntohs(answers[i]->data_len));
 340                 idx += ntohs(answers[i]->data_len);
 341
 342                 printf("answer for %s type=%d (%s) class=%d (%s) ttl=%d data_len=%d\n", answers[i]->name, ntohs(answers[i]->type), dns_types(ntohs(answers[i]->type)), ntohs(answers[i]->class), dns_classes(ntohs(answers[i]->class)), ntohl(answers[i]->ttl), ntohs(answers[i]->data_len));
 343         }
 344         /*}}}*/
 345         for (i = 0; i < nscount; i++) { /*{{{*/
 346                 nameserver[i] = alloca(sizeof(struct dns_record));
 347                 nameserver[i]->name = alloca(255); // see RFC1035
 348                 unsigned char* name = nameserver[i]->name;
 349
 350                 idx = parse_dns_name(name, pkt->data, idx);
 351
 352                 printf("%d\n", idx);
 353                 nameserver[i]->type = *((unsigned short*)(pkt->data+idx));
 354                 idx += 2;
 355                 nameserver[i]->class = *((unsigned short*)(pkt->data+idx));
 356                 idx += 2;
 357                 nameserver[i]->ttl = *((unsigned int*)(pkt->data+idx));
 358                 idx += 4;
 359                 nameserver[i]->data_len = *((unsigned short*)(pkt->data+idx));
 360                 idx += 2;
 361                 nameserver[i]->data = alloca(ntohs(nameserver[i]->data_len));
 362                 memcpy(nameserver[i]->data, pkt->data+idx, ntohs(nameserver[i]->data_len));
 363                 idx += ntohs(nameserver[i]->data_len);
 364
 365                 printf("nameserver for %s type=%d (%s) class=%d (%s) ttl=%d data_len=%d\n", nameserver[i]->name, ntohs(nameserver[i]->type), dns_types(ntohs(nameserver[i]->type)), ntohs(nameserver[i]->class), dns_classes(ntohs(nameserver[i]->class)), ntohl(nameserver[i]->ttl), ntohs(nameserver[i]->data_len));
 366         }
 367         /*}}}*/
 368         for (i = 0; i < arcount; i++) { /*{{{*/
 369                 additional[i] = alloca(sizeof(struct dns_query));
 370                 additional[i]->name = alloca(255); // see RFC1035
 371                 unsigned char* name = additional[i]->name;
 372
 373                 idx = parse_dns_name(name, pkt->data, idx);
 374
 375                 printf("%d\n", idx);
 376                 additional[i]->type = *((unsigned short*)(pkt->data+idx));
 377                 idx += 2;
 378                 additional[i]->class = *((unsigned short*)(pkt->data+idx));
 379                 idx += 2;
 380                 additional[i]->ttl = *((unsigned int*)(pkt->data+idx));
 381                 idx += 4;
 382                 additional[i]->data_len = *((unsigned short*)(pkt->data+idx));
 383                 idx += 2;
 384                 additional[i]->data = alloca(ntohs(additional[i]->data_len));
 385                 memcpy(additional[i]->data, pkt->data+idx, ntohs(additional[i]->data_len));
 386                 idx += ntohs(additional[i]->data_len);
 387
 388                 printf("additional record for %s type=%d (%s) class=%d (%s) ttl=%d data_len=%d\n", additional[i]->name, ntohs(additional[i]->type), dns_types(ntohs(additional[i]->type)), ntohs(additional[i]->class), dns_classes(ntohs(additional[i]->class)), ntohl(additional[i]->ttl), ntohs(additional[i]->data_len));
 389         }
 390         /*}}}*/
 391 }}}
 392
 393 void pkt_printf_udp_dns(struct udp_dns* pkt) {{{
 394         pkt_printf_dns(&pkt->data);
 395 }}}
 396
 397 void pkt_printf_ip6dns(struct ip6_udp_dns* pkt) {{{
 398         pkt_printf_udp_dns(&pkt->udp_dns);
 399 }}}
 400
 401 void pkt_printf_ipdns(struct ip_udp_dns* pkt) {{{
 402         pkt_printf_udp_dns(&pkt->udp_dns);
 403 }}}