1 /* 2 * Copyright (c) 1998-2004 Hannes Gredler <hannes@gredler.at> 3 * The TCPDUMP project 4 * 5 * Redistribution and use in source and binary forms, with or without 6 * modification, are permitted provided that: (1) source code 7 * distributions retain the above copyright notice and this paragraph 8 * in its entirety, and (2) distributions including binary code include 9 * the above copyright notice and this paragraph in its entirety in 10 * the documentation or other materials provided with the distribution. 11 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND 12 * WITHOUT ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, WITHOUT 13 * LIMITATION, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 14 * FOR A PARTICULAR PURPOSE. 15 */ 16 17 #include <sys/cdefs.h> 18 #ifndef lint 19 __RCSID("$NetBSD: print-syslog.c,v 1.8 2017/09/08 14:01:13 christos Exp $"); 20 #endif 21 22 /* \summary: Syslog protocol printer */ 23 24 #ifdef HAVE_CONFIG_H 25 #include "config.h" 26 #endif 27 28 #include <netdissect-stdinc.h> 29 30 #include "netdissect.h" 31 #include "extract.h" 32 33 static const char tstr[] = "[|syslog]"; 34 35 /* 36 * tokenlists and #defines taken from Ethereal - Network traffic analyzer 37 * by Gerald Combs <gerald@ethereal.com> 38 */ 39 40 #define SYSLOG_SEVERITY_MASK 0x0007 /* 0000 0000 0000 0111 */ 41 #define SYSLOG_FACILITY_MASK 0x03f8 /* 0000 0011 1111 1000 */ 42 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */ 43 44 static const struct tok syslog_severity_values[] = { 45 { 0, "emergency" }, 46 { 1, "alert" }, 47 { 2, "critical" }, 48 { 3, "error" }, 49 { 4, "warning" }, 50 { 5, "notice" }, 51 { 6, "info" }, 52 { 7, "debug" }, 53 { 0, NULL }, 54 }; 55 56 static const struct tok syslog_facility_values[] = { 57 { 0, "kernel" }, 58 { 1, "user" }, 59 { 2, "mail" }, 60 { 3, "daemon" }, 61 { 4, "auth" }, 62 { 5, "syslog" }, 63 { 6, "lpr" }, 64 { 7, "news" }, 65 { 8, "uucp" }, 66 { 9, "cron" }, 67 { 10, "authpriv" }, 68 { 11, "ftp" }, 69 { 12, "ntp" }, 70 { 13, "security" }, 71 { 14, "console" }, 72 { 15, "cron" }, 73 { 16, "local0" }, 74 { 17, "local1" }, 75 { 18, "local2" }, 76 { 19, "local3" }, 77 { 20, "local4" }, 78 { 21, "local5" }, 79 { 22, "local6" }, 80 { 23, "local7" }, 81 { 0, NULL }, 82 }; 83 84 void 85 syslog_print(netdissect_options *ndo, 86 register const u_char *pptr, register u_int len) 87 { 88 uint16_t msg_off = 0; 89 uint16_t pri = 0; 90 uint16_t facility,severity; 91 92 /* extract decimal figures that are 93 * encapsulated within < > tags 94 * based on this decimal figure extract the 95 * severity and facility values 96 */ 97 98 ND_TCHECK2(*pptr, 1); 99 if (*(pptr+msg_off) == '<') { 100 msg_off++; 101 ND_TCHECK2(*(pptr + msg_off), 1); 102 while ( *(pptr+msg_off) >= '0' && 103 *(pptr+msg_off) <= '9' && 104 msg_off <= SYSLOG_MAX_DIGITS) { 105 pri = pri * 10 + (*(pptr+msg_off) - '0'); 106 msg_off++; 107 ND_TCHECK2(*(pptr + msg_off), 1); 108 } 109 if (*(pptr+msg_off) != '>') { 110 ND_PRINT((ndo, "%s", tstr)); 111 return; 112 } 113 msg_off++; 114 } else { 115 ND_PRINT((ndo, "%s", tstr)); 116 return; 117 } 118 119 facility = (pri & SYSLOG_FACILITY_MASK) >> 3; 120 severity = pri & SYSLOG_SEVERITY_MASK; 121 122 if (ndo->ndo_vflag < 1 ) 123 { 124 ND_PRINT((ndo, "SYSLOG %s.%s, length: %u", 125 tok2str(syslog_facility_values, "unknown (%u)", facility), 126 tok2str(syslog_severity_values, "unknown (%u)", severity), 127 len)); 128 return; 129 } 130 131 ND_PRINT((ndo, "SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ", 132 len, 133 tok2str(syslog_facility_values, "unknown (%u)", facility), 134 facility, 135 tok2str(syslog_severity_values, "unknown (%u)", severity), 136 severity)); 137 138 /* print the syslog text in verbose mode */ 139 for (; msg_off < len; msg_off++) { 140 ND_TCHECK2(*(pptr + msg_off), 1); 141 safeputchar(ndo, *(pptr + msg_off)); 142 } 143 144 if (ndo->ndo_vflag > 1) 145 print_unknown_data(ndo, pptr, "\n\t", len); 146 147 return; 148 149 trunc: 150 ND_PRINT((ndo, "%s", tstr)); 151 } 152