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