1 /* 2 * CDDL HEADER START 3 * 4 * The contents of this file are subject to the terms of the 5 * Common Development and Distribution License (the "License"). 6 * You may not use this file except in compliance with the License. 7 * 8 * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE 9 * or http://www.opensolaris.org/os/licensing. 10 * See the License for the specific language governing permissions 11 * and limitations under the License. 12 * 13 * When distributing Covered Code, include this CDDL HEADER in each 14 * file and include the License file at usr/src/OPENSOLARIS.LICENSE. 15 * If applicable, add the following below this CDDL HEADER, with the 16 * fields enclosed by brackets "[]" replaced with your own identifying 17 * information: Portions Copyright [yyyy] [name of copyright owner] 18 * 19 * CDDL HEADER END 20 */ 21 /* 22 * Copyright 2007 Sun Microsystems, Inc. All rights reserved. 23 * Use is subject to license terms. 24 */ 25 26 27 #pragma ident "%Z%%M% %I% %E% SMI" /* SunOS */ 28 29 #include <stdio.h> 30 #include <stdlib.h> 31 #include <ctype.h> 32 #include <strings.h> 33 #include <sys/sysmacros.h> 34 #include <sys/types.h> 35 #include <sys/errno.h> 36 #include <setjmp.h> 37 #include <sys/socket.h> 38 #include <net/if.h> 39 #include <netinet/in_systm.h> 40 #include <netinet/in.h> 41 #include <netinet/ip.h> 42 #include <netinet/if_ether.h> 43 #include "snoop.h" 44 45 struct porttable { 46 int pt_num; 47 char *pt_short; 48 }; 49 50 static const struct porttable pt_udp[] = { 51 { IPPORT_ECHO, "ECHO" }, 52 { IPPORT_DISCARD, "DISCARD" }, 53 { IPPORT_DAYTIME, "DAYTIME" }, 54 { IPPORT_CHARGEN, "CHARGEN" }, 55 { IPPORT_TIMESERVER, "TIME" }, 56 { IPPORT_NAMESERVER, "NAME" }, 57 { IPPORT_DOMAIN, "DNS" }, 58 { IPPORT_BOOTPS, "BOOTPS" }, 59 { IPPORT_BOOTPC, "BOOTPC" }, 60 { IPPORT_TFTP, "TFTP" }, 61 { IPPORT_FINGER, "FINGER" }, 62 /* { 111, "PORTMAP" }, Just Sun RPC */ 63 { IPPORT_NTP, "NTP" }, 64 { IPPORT_NETBIOS_NS, "NBNS" }, 65 { IPPORT_NETBIOS_DGM, "NBDG" }, 66 { IPPORT_LDAP, "LDAP" }, 67 { IPPORT_SLP, "SLP" }, 68 /* Mobile IP defines a set of new control messages sent over UDP port 434 */ 69 { IPPORT_MIP, "Mobile IP" }, 70 { IPPORT_BIFFUDP, "BIFF" }, 71 { IPPORT_WHOSERVER, "WHO" }, 72 { IPPORT_SYSLOG, "SYSLOG" }, 73 { IPPORT_TALK, "TALK" }, 74 { IPPORT_ROUTESERVER, "RIP" }, 75 { IPPORT_RIPNG, "RIPng" }, 76 { IPPORT_DHCPV6C, "DHCPv6C" }, 77 { IPPORT_DHCPV6S, "DHCPv6S" }, 78 { 550, "NEW-RWHO" }, 79 { 560, "RMONITOR" }, 80 { 561, "MONITOR" }, 81 { IPPORT_SOCKS, "SOCKS" }, 82 { 0, NULL } 83 }; 84 85 static struct porttable pt_tcp[] = { 86 { 1, "TCPMUX" }, 87 { IPPORT_ECHO, "ECHO" }, 88 { IPPORT_DISCARD, "DISCARD" }, 89 { IPPORT_SYSTAT, "SYSTAT" }, 90 { IPPORT_DAYTIME, "DAYTIME" }, 91 { IPPORT_NETSTAT, "NETSTAT" }, 92 { IPPORT_CHARGEN, "CHARGEN" }, 93 { 20, "FTP-DATA" }, 94 { IPPORT_FTP, "FTP" }, 95 { IPPORT_TELNET, "TELNET" }, 96 { IPPORT_SMTP, "SMTP" }, 97 { IPPORT_TIMESERVER, "TIME" }, 98 { 39, "RLP" }, 99 { IPPORT_NAMESERVER, "NAMESERVER" }, 100 { IPPORT_WHOIS, "NICNAME" }, 101 { IPPORT_DOMAIN, "DNS" }, 102 { 70, "GOPHER" }, 103 { IPPORT_RJE, "RJE" }, 104 { IPPORT_FINGER, "FINGER" }, 105 { IPPORT_HTTP, "HTTP" }, 106 { IPPORT_TTYLINK, "LINK" }, 107 { IPPORT_SUPDUP, "SUPDUP" }, 108 { 101, "HOSTNAME" }, 109 { 102, "ISO-TSAP" }, 110 { 103, "X400" }, 111 { 104, "X400-SND" }, 112 { 105, "CSNET-NS" }, 113 { 109, "POP-2" }, 114 /* { 111, "PORTMAP" }, Just Sun RPC */ 115 { 113, "AUTH" }, 116 { 117, "UUCP-PATH" }, 117 { 119, "NNTP" }, 118 { IPPORT_NTP, "NTP" }, 119 { IPPORT_NETBIOS_SSN, "NBT" }, 120 { 143, "IMAP" }, 121 { 144, "NeWS" }, 122 { IPPORT_LDAP, "LDAP" }, 123 { IPPORT_SLP, "SLP" }, 124 { 443, "HTTPS" }, 125 { 445, "SMB" }, 126 { IPPORT_EXECSERVER, "EXEC" }, 127 { IPPORT_LOGINSERVER, "RLOGIN" }, 128 { IPPORT_CMDSERVER, "RSHELL" }, 129 { IPPORT_PRINTER, "PRINTER" }, 130 { 530, "COURIER" }, 131 { 540, "UUCP" }, 132 { 600, "PCSERVER" }, 133 { IPPORT_SOCKS, "SOCKS" }, 134 { 1524, "INGRESLOCK" }, 135 { 2904, "M2UA" }, 136 { 2905, "M3UA" }, 137 { 6000, "XWIN" }, 138 { IPPORT_HTTP_ALT, "HTTP (proxy)" }, 139 { 9900, "IUA" }, 140 { 0, NULL }, 141 }; 142 143 char * 144 getportname(int proto, in_port_t port) 145 { 146 const struct porttable *p, *pt; 147 148 switch (proto) { 149 case IPPROTO_SCTP: /* fallthru */ 150 case IPPROTO_TCP: pt = pt_tcp; break; 151 case IPPROTO_UDP: pt = pt_udp; break; 152 default: return (NULL); 153 } 154 155 for (p = pt; p->pt_num; p++) { 156 if (port == p->pt_num) 157 return (p->pt_short); 158 } 159 return (NULL); 160 } 161 162 int 163 reservedport(int proto, int port) 164 { 165 const struct porttable *p, *pt; 166 167 switch (proto) { 168 case IPPROTO_TCP: pt = pt_tcp; break; 169 case IPPROTO_UDP: pt = pt_udp; break; 170 default: return (NULL); 171 } 172 for (p = pt; p->pt_num; p++) { 173 if (port == p->pt_num) 174 return (1); 175 } 176 return (0); 177 } 178 179 /* 180 * Need to be able to register an 181 * interpreter for transient ports. 182 * See TFTP interpreter. 183 */ 184 #define MAXTRANS 64 185 static struct ttable { 186 int t_port; 187 int (*t_proc)(int, char *, int); 188 } transients [MAXTRANS]; 189 190 int 191 add_transient(int port, int (*proc)(int, char *, int)) 192 { 193 static struct ttable *next = transients; 194 195 next->t_port = port; 196 next->t_proc = proc; 197 198 if (++next >= &transients[MAXTRANS]) 199 next = transients; 200 201 return (1); 202 } 203 204 static struct ttable * 205 is_transient(int port) 206 { 207 struct ttable *p; 208 209 for (p = transients; p->t_port && p < &transients[MAXTRANS]; p++) { 210 if (port == p->t_port) 211 return (p); 212 } 213 214 return (NULL); 215 } 216 217 void 218 del_transient(int port) 219 { 220 struct ttable *p; 221 222 for (p = transients; p->t_port && p < &transients[MAXTRANS]; p++) { 223 if (port == p->t_port) 224 p->t_port = -1; 225 } 226 } 227 228 static void 229 interpret_syslog(int flags, char dir, int port, const char *syslogstr, 230 int dlen) 231 { 232 static const char *pris[] = { 233 "emerg", "alert", "crit", "error", "warn", "notice", "info", "debug" 234 }; 235 static const char *facs[] = { 236 "kern", "user", "mail", "daemon", "auth", "syslog", "lpr", "news", 237 "uucp", NULL, NULL, NULL, NULL, "audit", NULL, "cron", "local0", 238 "local1", "local2", "local3", "local4", "local5", "local6", "local7" 239 }; 240 241 int composit; 242 int pri = -1; 243 int facil = -1; 244 boolean_t bogus = B_TRUE; 245 int priostrlen = 0; 246 int datalen = dlen; 247 char unknown[4]; /* for unrecognized ones */ 248 const char *facilstr = "BAD"; 249 const char *pristr = "FMT"; 250 const char *data = syslogstr; 251 252 /* 253 * Is there enough data to interpret (left bracket + at least 3 chars 254 * which could be digits, right bracket, or space)? 255 */ 256 if (datalen >= 4 && data != NULL) { 257 if (*data == '<') { 258 const int FACS_LEN = sizeof (facs) / sizeof (facs[0]); 259 char buffer[4]; 260 char *end; 261 262 data++; 263 datalen--; 264 265 (void) strlcpy(buffer, data, sizeof (buffer)); 266 composit = strtoul(buffer, &end, 0); 267 data += end - buffer; 268 if (*data == '>') { 269 data++; 270 datalen -= end - buffer + 1; 271 272 pri = composit & 0x7; 273 facil = (composit & 0xF8) >> 3; 274 275 if ((facil >= FACS_LEN) || 276 (facs[facil] == NULL)) { 277 snprintf(unknown, sizeof (unknown), 278 "%d", facil); 279 facilstr = unknown; 280 } else { 281 facilstr = facs[facil]; 282 } 283 pristr = pris[pri]; 284 priostrlen = dlen - datalen; 285 bogus = B_FALSE; 286 } else { 287 data = syslogstr; 288 datalen = dlen; 289 } 290 } 291 } 292 293 if (flags & F_SUM) { 294 (void) snprintf(get_sum_line(), MAXLINE, 295 "SYSLOG %c port=%d %s.%s: %s", 296 dir, port, facilstr, pristr, 297 show_string(syslogstr, dlen, 20)); 298 299 } 300 301 if (flags & F_DTAIL) { 302 static char syslog[] = "SYSLOG: "; 303 show_header(syslog, syslog, dlen); 304 show_space(); 305 (void) snprintf(get_detail_line(0, 0), MAXLINE, 306 "%s%sPriority: %.*s%s(%s.%s)", prot_nest_prefix, syslog, 307 priostrlen, syslogstr, bogus ? "" : " ", 308 facilstr, pristr); 309 (void) snprintf(get_line(0, 0), get_line_remain(), 310 "\"%s\"", 311 show_string(syslogstr, dlen, 60)); 312 show_trailer(); 313 } 314 } 315 316 int src_port, dst_port, curr_proto; 317 318 int 319 interpret_reserved(int flags, int proto, in_port_t src, in_port_t dst, 320 char *data, int dlen) 321 { 322 const char *pn; 323 int dir, port, which; 324 char pbuff[16], hbuff[32]; 325 struct ttable *ttabp; 326 327 src_port = src; 328 dst_port = dst; 329 curr_proto = proto; 330 331 pn = getportname(proto, src); 332 if (pn != NULL) { 333 dir = 'R'; 334 port = dst; 335 which = src; 336 } else { 337 pn = getportname(proto, dst); 338 if (pn == NULL) { 339 ttabp = is_transient(src); 340 if (ttabp) { 341 (ttabp->t_proc)(flags, data, dlen); 342 return (1); 343 } 344 ttabp = is_transient(dst); 345 if (ttabp) { 346 (ttabp->t_proc)(flags, data, dlen); 347 return (1); 348 } 349 return (0); 350 } 351 352 dir = 'C'; 353 port = src; 354 which = dst; 355 } 356 357 if ((dst == IPPORT_DOMAIN || src == IPPORT_DOMAIN) && 358 proto != IPPROTO_TCP) { 359 interpret_dns(flags, proto, (uchar_t *)data, dlen); 360 return (1); 361 } 362 363 if (dst == IPPORT_SYSLOG && proto != IPPROTO_TCP) { 364 /* 365 * TCP port 514 is rshell. UDP port 514 is syslog. 366 */ 367 interpret_syslog(flags, dir, port, (const char *)data, dlen); 368 return (1); 369 } 370 371 if (dlen > 0) { 372 switch (which) { 373 case IPPORT_BOOTPS: 374 case IPPORT_BOOTPC: 375 (void) interpret_dhcp(flags, (struct dhcp *)data, 376 dlen); 377 return (1); 378 case IPPORT_DHCPV6S: 379 case IPPORT_DHCPV6C: 380 (void) interpret_dhcpv6(flags, (uint8_t *)data, dlen); 381 return (1); 382 case IPPORT_TFTP: 383 (void) interpret_tftp(flags, (struct tftphdr *)data, 384 dlen); 385 return (1); 386 case IPPORT_HTTP: 387 case IPPORT_HTTP_ALT: 388 (void) interpret_http(flags, data, dlen); 389 return (1); 390 case IPPORT_NTP: 391 (void) interpret_ntp(flags, (struct ntpdata *)data, 392 dlen); 393 return (1); 394 case IPPORT_NETBIOS_NS: 395 interpret_netbios_ns(flags, (uchar_t *)data, dlen); 396 return (1); 397 case IPPORT_NETBIOS_DGM: 398 interpret_netbios_datagram(flags, (uchar_t *)data, 399 dlen); 400 return (1); 401 case IPPORT_NETBIOS_SSN: 402 case 445: 403 /* 404 * SMB on port 445 is a subset of NetBIOS SMB 405 * on port 139. The same interpreter can be used 406 * for both. 407 */ 408 interpret_netbios_ses(flags, (uchar_t *)data, dlen); 409 return (1); 410 case IPPORT_LDAP: 411 interpret_ldap(flags, data, dlen, src, dst); 412 return (1); 413 case IPPORT_SLP: 414 interpret_slp(flags, data, dlen); 415 return (1); 416 case IPPORT_MIP: 417 interpret_mip_cntrlmsg(flags, (uchar_t *)data, dlen); 418 return (1); 419 case IPPORT_ROUTESERVER: 420 (void) interpret_rip(flags, (struct rip *)data, dlen); 421 return (1); 422 case IPPORT_RIPNG: 423 (void) interpret_rip6(flags, (struct rip6 *)data, 424 dlen); 425 return (1); 426 case IPPORT_SOCKS: 427 if (dir == 'C') 428 (void) interpret_socks_call(flags, data, dlen); 429 else 430 (void) interpret_socks_reply(flags, data, 431 dlen); 432 return (1); 433 } 434 } 435 436 if (flags & F_SUM) { 437 (void) snprintf(get_sum_line(), MAXLINE, 438 "%s %c port=%d %s", 439 pn, dir, port, 440 show_string(data, dlen, 20)); 441 } 442 443 if (flags & F_DTAIL) { 444 (void) snprintf(pbuff, sizeof (pbuff), "%s: ", pn); 445 (void) snprintf(hbuff, sizeof (hbuff), "%s: ", pn); 446 show_header(pbuff, hbuff, dlen); 447 show_space(); 448 (void) snprintf(get_line(0, 0), get_line_remain(), 449 "\"%s\"", 450 show_string(data, dlen, 60)); 451 show_trailer(); 452 } 453 return (1); 454 } 455 456 char * 457 show_string(const char *str, int dlen, int maxlen) 458 /* 459 * Prints len bytes from str enclosed in quotes. 460 * If len is negative, length is taken from strlen(str). 461 * No more than maxlen bytes will be printed. Longer 462 * strings are flagged with ".." after the closing quote. 463 * Non-printing characters are converted to C-style escape 464 * codes or octal digits. 465 */ 466 { 467 #define TBSIZE 256 468 static char tbuff[TBSIZE]; 469 const char *p; 470 char *pp; 471 int printable = 0; 472 int c, len; 473 474 len = dlen > maxlen ? maxlen : dlen; 475 dlen = len; 476 477 for (p = str, pp = tbuff; len; p++, len--) { 478 switch (c = *p & 0xFF) { 479 case '\n': (void) strcpy(pp, "\\n"); pp += 2; break; 480 case '\b': (void) strcpy(pp, "\\b"); pp += 2; break; 481 case '\t': (void) strcpy(pp, "\\t"); pp += 2; break; 482 case '\r': (void) strcpy(pp, "\\r"); pp += 2; break; 483 case '\f': (void) strcpy(pp, "\\f"); pp += 2; break; 484 default: 485 if (isascii(c) && isprint(c)) { 486 *pp++ = c; 487 printable++; 488 } else { 489 (void) snprintf(pp, TBSIZE - (pp - tbuff), 490 isdigit(*(p + 1)) ? 491 "\\%03o" : "\\%o", c); 492 pp += strlen(pp); 493 } 494 break; 495 } 496 *pp = '\0'; 497 /* 498 * Check for overflow of temporary buffer. Allow for 499 * the next character to be a \nnn followed by a trailing 500 * null. If not, then just bail with what we have. 501 */ 502 if (pp + 5 >= &tbuff[TBSIZE]) { 503 break; 504 } 505 } 506 return (printable > dlen / 2 ? tbuff : ""); 507 } 508