1 /* 2 * Copyright (c) 1998-2004 Hannes Gredler <hannes@tcpdump.org> 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 1.6 2017/01/24 23:29:14 christos Exp $"); 20 #endif 21 22 #ifdef HAVE_CONFIG_H 23 #include "config.h" 24 #endif 25 26 #include <netdissect-stdinc.h> 27 28 #include "netdissect.h" 29 #include "extract.h" 30 31 static const char tstr[] = "[|syslog]"; 32 33 /* 34 * tokenlists and #defines taken from Ethereal - Network traffic analyzer 35 * by Gerald Combs <gerald@ethereal.com> 36 */ 37 38 #define SYSLOG_SEVERITY_MASK 0x0007 /* 0000 0000 0000 0111 */ 39 #define SYSLOG_FACILITY_MASK 0x03f8 /* 0000 0011 1111 1000 */ 40 #define SYSLOG_MAX_DIGITS 3 /* The maximum number if priority digits to read in. */ 41 42 static const struct tok syslog_severity_values[] = { 43 { 0, "emergency" }, 44 { 1, "alert" }, 45 { 2, "critical" }, 46 { 3, "error" }, 47 { 4, "warning" }, 48 { 5, "notice" }, 49 { 6, "info" }, 50 { 7, "debug" }, 51 { 0, NULL }, 52 }; 53 54 static const struct tok syslog_facility_values[] = { 55 { 0, "kernel" }, 56 { 1, "user" }, 57 { 2, "mail" }, 58 { 3, "daemon" }, 59 { 4, "auth" }, 60 { 5, "syslog" }, 61 { 6, "lpr" }, 62 { 7, "news" }, 63 { 8, "uucp" }, 64 { 9, "cron" }, 65 { 10, "authpriv" }, 66 { 11, "ftp" }, 67 { 12, "ntp" }, 68 { 13, "security" }, 69 { 14, "console" }, 70 { 15, "cron" }, 71 { 16, "local0" }, 72 { 17, "local1" }, 73 { 18, "local2" }, 74 { 19, "local3" }, 75 { 20, "local4" }, 76 { 21, "local5" }, 77 { 22, "local6" }, 78 { 23, "local7" }, 79 { 0, NULL }, 80 }; 81 82 void 83 syslog_print(netdissect_options *ndo, 84 register const u_char *pptr, register u_int len) 85 { 86 uint16_t msg_off = 0; 87 uint16_t pri = 0; 88 uint16_t facility,severity; 89 90 /* extract decimal figures that are 91 * encapsulated within < > tags 92 * based on this decimal figure extract the 93 * severity and facility values 94 */ 95 96 ND_TCHECK2(*pptr, 1); 97 if (*(pptr+msg_off) == '<') { 98 msg_off++; 99 ND_TCHECK2(*(pptr + msg_off), 1); 100 while ( *(pptr+msg_off) >= '0' && 101 *(pptr+msg_off) <= '9' && 102 msg_off <= SYSLOG_MAX_DIGITS) { 103 pri = pri * 10 + (*(pptr+msg_off) - '0'); 104 msg_off++; 105 ND_TCHECK2(*(pptr + msg_off), 1); 106 } 107 if (*(pptr+msg_off) != '>') { 108 ND_PRINT((ndo, "%s", tstr)); 109 return; 110 } 111 msg_off++; 112 } else { 113 ND_PRINT((ndo, "%s", tstr)); 114 return; 115 } 116 117 facility = (pri & SYSLOG_FACILITY_MASK) >> 3; 118 severity = pri & SYSLOG_SEVERITY_MASK; 119 120 if (ndo->ndo_vflag < 1 ) 121 { 122 ND_PRINT((ndo, "SYSLOG %s.%s, length: %u", 123 tok2str(syslog_facility_values, "unknown (%u)", facility), 124 tok2str(syslog_severity_values, "unknown (%u)", severity), 125 len)); 126 return; 127 } 128 129 ND_PRINT((ndo, "SYSLOG, length: %u\n\tFacility %s (%u), Severity %s (%u)\n\tMsg: ", 130 len, 131 tok2str(syslog_facility_values, "unknown (%u)", facility), 132 facility, 133 tok2str(syslog_severity_values, "unknown (%u)", severity), 134 severity)); 135 136 /* print the syslog text in verbose mode */ 137 for (; msg_off < len; msg_off++) { 138 ND_TCHECK2(*(pptr + msg_off), 1); 139 safeputchar(ndo, *(pptr + msg_off)); 140 } 141 142 if (ndo->ndo_vflag > 1) 143 print_unknown_data(ndo, pptr, "\n\t", len); 144 145 return; 146 147 trunc: 148 ND_PRINT((ndo, "%s", tstr)); 149 } 150