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1
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1 /***************************************************************************
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2 * Copyright (C) 2005 by 510 Software Group *
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3 * *
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4 * *
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5 * This program is free software; you can redistribute it and/or modify *
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6 * it under the terms of the GNU General Public License as published by *
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7 * the Free Software Foundation; either version 2 of the License, or *
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8 * (at your option) any later version. *
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9 * *
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10 * This program is distributed in the hope that it will be useful, *
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11 * but WITHOUT ANY WARRANTY; without even the implied warranty of *
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12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the *
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13 * GNU General Public License for more details. *
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14 * *
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15 * You should have received a copy of the GNU General Public License *
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16 * along with this program; if not, write to the *
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17 * Free Software Foundation, Inc., *
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18 * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. *
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19 ***************************************************************************/
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20
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21 #include "includes.h"
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2
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22 #include <fcntl.h>
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3
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23 #include <sys/socket.h>
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24 #include <netinet/in.h>
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25 #include <arpa/inet.h>
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26 #include <netdb.h>
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1
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27
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28 static char* syslogconfig_version="$Id$";
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29
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3
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30 char *token_bucket;
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1
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31 char *token_file;
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3
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32 char *token_ignore;
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1
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33 char *token_include;
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3
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34 char *token_index;
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1
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35 char *token_lbrace;
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3
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36 char *token_pattern;
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1
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37 char *token_rbrace;
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38 char *token_semi;
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3
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39 char *token_slash;
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40 char *token_threshold;
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41
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42 struct ltint
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43 {
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44 bool operator()(const int s1, const int s2) const
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45 {
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46 return (unsigned)s1 < (unsigned)s2;
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47 }
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48 };
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1
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49
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50 string_set all_strings; // owns all the strings, only modified by the config loader thread
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51 const int maxlen = 1000; // used for snprintf buffers
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3
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52 typedef map<int, int, ltint> ip_buckets;
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53
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54 class IPR {
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55 ip_buckets violations;
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56 public:
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57 void add(int ip, int bucket, CONFIG &con);
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58 void changed(CONFIG &con);
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59 void leak(int amount, CONFIG &con);
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60 };
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61
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62 IPR recorder;
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63
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64
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65 ////////////////////////////////////////////////
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66 //
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67 void IPR::add(int ip, int bucket, CONFIG &con) {
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68 if (con.looking(ip)) {
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69 ip_buckets::iterator i = violations.find(ip);
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70 if (i == violations.end()) violations[ip] = bucket;
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71 else {
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72 (*i).second += bucket;
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73 if ((*i).second > con.get_threshold()) changed(con);
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74 }
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75 }
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76 }
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77
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78
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79 void IPR::leak(int amount, CONFIG &con) {
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80 bool ch = false;
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81 for (ip_buckets::iterator i=violations.begin(); i!=violations.end(); ) {
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82 int ip = (*i).first;
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83 int n = (*i).second;
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84 in_addr ad;
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85 ad.s_addr = htonl(ip);
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86 char buf[maxlen];
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87 snprintf(buf, maxlen, "leak %s with %d count", inet_ntoa(ad), n);
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88 my_syslog(buf);
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89 if (n <= amount) {
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90 ch = true;
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91 violations.erase(i++);
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92 }
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93 else {
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94 (*i).second -= amount;
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95 i++;
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96 }
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97 }
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98 if (ch) changed(con);
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99 }
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100
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101
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102 void IPR::changed(CONFIG &con) {
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103 my_syslog("**** dump");
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104 for (ip_buckets::iterator i=violations.begin(); i!=violations.end(); i++) {
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105 int ip = (*i).first;
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106 int n = (*i).second;
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107 in_addr ad;
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108 ad.s_addr = htonl(ip);
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109 char buf[maxlen];
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110 snprintf(buf, maxlen, "%s with %d count", inet_ntoa(ad), n);
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111 my_syslog(buf);
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112 }
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113 }
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1
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114
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115
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3
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116 ////////////////////////////////////////////////
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117 //
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118 int ip_address(char *have);
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119 int ip_address(char *have) {
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120 int ipaddr = 0;
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121 in_addr ip;
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122 if (inet_aton(have, &ip)) ipaddr = ip.s_addr;
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123 else {
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124 struct hostent *host = gethostbyname(have);
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125 if (host && host->h_addrtype == AF_INET) memcpy(&ipaddr, host->h_addr, sizeof(ipaddr));
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126 }
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127 return ntohl(ipaddr);
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128 }
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129
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130
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131 ////////////////////////////////////////////////
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132 //
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133 PATTERN::PATTERN(TOKEN &tok, char *pattern_, int index_, int bucket_) {
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134 pattern = pattern_;
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135 index = index_;
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136 bucket = bucket_;
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137 if (pattern) {
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138 int rc = regcomp(&re, pattern, REG_ICASE | REG_EXTENDED);
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139 if (rc) {
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140 char bu[maxlen];
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141 regerror(rc, &re, bu, maxlen);
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142 char buf[maxlen];
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143 snprintf(buf, sizeof(buf), "pattern %s not valid - %s", pattern, bu);
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144 tok.token_error(buf);
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145 pattern = NULL;
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146 }
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147 }
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148 }
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149
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150
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151 PATTERN::~PATTERN() {
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152 regfree(&re);
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153 }
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154
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155
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156 bool PATTERN::process(char *buf, CONFIG &con) {
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157 if (pattern) {
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158 const int nmatch = index+1;
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159 regmatch_t match[nmatch];
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160 if (0 == regexec(&re, buf, nmatch, match, 0)) {
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161 int s = match[index].rm_so;
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162 int e = match[index].rm_eo;
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163 // char bu[maxlen];
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164 // snprintf(bu, maxlen, "re match from %d to %d", s, e);
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165 // my_syslog(bu);
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166 if (s != -1) {
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167 my_syslog(buf);
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168 buf[e] = '\0';
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169 int ip = ip_address(buf+s);
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170 if (ip) {
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171 my_syslog(buf+s);
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172 recorder.add(ip, bucket, con);
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173 }
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174 return true;
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175 }
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176 }
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177 }
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178 return false;
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179 }
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180
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181
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182 void PATTERN::dump(int level) {
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183 char indent[maxlen];
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184 int i = min(maxlen-1, level*4);
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185 memset(indent, ' ', i);
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186 indent[i] = '\0';
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187 printf("%s pattern \"%s\" {; \n", indent, pattern);
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188 printf("%s index %d; \n", indent, index);
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189 printf("%s bucket %d; \n", indent, bucket);
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190 printf("%s }; \n", indent);
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191 }
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192
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193
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194 ////////////////////////////////////////////////
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195 //
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1
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196 CONFIG::CONFIG() {
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197 reference_count = 0;
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198 generation = 0;
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199 load_time = 0;
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200 }
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201
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202
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203 CONFIG::~CONFIG() {
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204 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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205 SYSLOGCONFIG *c = *i;
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206 delete c;
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207 }
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3
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208 ignore.clear();
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1
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209 }
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210
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211
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212 void CONFIG::add_syslogconfig(SYSLOGCONFIGP con) {
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213 syslogconfigs.push_back(con);
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214 }
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215
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216
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3
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217 void CONFIG::add_pair(IPPAIR pair) {
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218 ignore.push_back(pair);
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219 }
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220
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221
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1
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222 void CONFIG::dump() {
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3
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223 printf(" threshold %d; \n\n", threshold);
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224
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225 printf(" ignore { \n");
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226 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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227 IPPAIR &p = *i;
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228 in_addr ip;
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229 ip.s_addr = htonl(p.first);
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230 printf(" %s/%d; \n", inet_ntoa(ip), p.cidr);
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231 }
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232 printf(" }; \n\n");
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233
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1
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234 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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235 SYSLOGCONFIGP c = *i;
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236 c->dump(0);
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237 }
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238 }
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239
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240
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2
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241 void CONFIG::read() {
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3
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242 while (true) {
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243 bool have = false;
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244 for (syslogconfig_list::iterator i=syslogconfigs.begin(); i!=syslogconfigs.end(); i++) {
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245 SYSLOGCONFIGP c = *i;
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246 have |= c->read(*this);
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247 }
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248 break; //!!
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249 if (!have) break;
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2
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250 }
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251 }
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252
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253
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3
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254 void CONFIG::sleep(int duration) {
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255 ::sleep(duration);
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256 recorder.leak(duration, *this);
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257 }
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258
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259
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260 bool CONFIG::looking(int ip) {
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261 for (ippair_list::iterator i=ignore.begin(); i!=ignore.end(); i++) {
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262 IPPAIR &p = *i;
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263 if ((p.first <= ip) && (ip <= p.last)) return false;
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264 }
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265 return true;
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266 }
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267
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268 ////////////////////////////////////////////////
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269 //
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270 SYSLOGCONFIG::SYSLOGCONFIG(TOKEN &tok, char *file_name_) {
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2
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271 file_name = file_name_;
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272 fd = open(file_name, O_RDONLY);
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273 len = 0;
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274 if (fd == -1) {
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275 char buf[maxlen];
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276 snprintf(buf, sizeof(buf), "syslog file %s not readable", file_name);
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277 tok.token_error(buf);
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278 }
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279 else {
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3
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280 //lseek(fd, 0, SEEK_END); //!!
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2
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281 }
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1
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282 }
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283
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284
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285 SYSLOGCONFIG::~SYSLOGCONFIG() {
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2
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286 if (fd != -1) close(fd);
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287 fd = -1;
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3
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288 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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289 PATTERN *p = *i;
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290 delete p;
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291 }
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2
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292 }
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293
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294
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3
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295 void SYSLOGCONFIG::add_pattern(PATTERNP pat) {
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296 patterns.push_back(pat);
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297 }
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298
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299
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300 bool SYSLOGCONFIG::read(CONFIG &con) {
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301 if (failed()) return false;
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302 int n = ::read(fd, buf+len, buflen-len);
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303 bool have = (n > 0);
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304 if (have) {
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2
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305 len += n;
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306 while (true) {
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307 char *p = (char*)memchr(buf, '\n', len);
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308 if (!p) break;
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309 n = p-buf;
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310 *p = '\0';
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3
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311 process(con); // process null terminated string
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2
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312 len -= n+1;
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313 memmove(buf, p+1, len);
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314 }
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315 // no <lf> in a full buffer
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316 if (len == buflen) len = 0;
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317 }
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3
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318 return have;
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2
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319 }
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320
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321
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3
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322 void SYSLOGCONFIG::process(CONFIG &con) {
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323 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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324 PATTERN *p = *i;
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325 if (p->process(buf, con)) break;
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326 }
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1
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327 }
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328
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329
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330 void SYSLOGCONFIG::dump(int level) {
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331 char indent[maxlen];
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332 int i = min(maxlen-1, level*4);
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333 memset(indent, ' ', i);
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334 indent[i] = '\0';
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335 char buf[maxlen];
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336 printf("%s file \"%s\" {\n", indent, file_name);
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3
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337 for (pattern_list::iterator i=patterns.begin(); i!=patterns.end(); i++) {
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338 PATTERN *p = *i;
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339 p->dump(level);
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340 }
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1
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341 printf("%s }; \n", indent);
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342 }
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343
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344
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345 ////////////////////////////////////////////////
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346 // helper to discard the strings held by a string_set
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347 //
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348 void discard(string_set &s) {
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349 for (string_set::iterator i=s.begin(); i!=s.end(); i++) {
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350 free(*i);
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351 }
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352 s.clear();
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353 }
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354
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355
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356 ////////////////////////////////////////////////
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357 // helper to register a string in a string set
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358 //
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359 char* register_string(string_set &s, char *name) {
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360 string_set::iterator i = s.find(name);
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361 if (i != s.end()) return *i;
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362 char *x = strdup(name);
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363 s.insert(x);
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364 return x;
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365 }
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366
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367
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368 ////////////////////////////////////////////////
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369 // register a global string
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370 //
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371 char* register_string(char *name) {
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372 return register_string(all_strings, name);
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373 }
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374
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375
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376 ////////////////////////////////////////////////
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377 //
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378 bool tsa(TOKEN &tok, char *token);
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379 bool tsa(TOKEN &tok, char *token) {
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380 char *have = tok.next();
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381 if (have == token) return true;
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382 tok.token_error(token, have);
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383 return false;
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384 }
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385
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386
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387 ////////////////////////////////////////////////
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388 //
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3
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389 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con);
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390 bool parse_pattern(TOKEN &tok, SYSLOGCONFIG &con) {
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391 char *pat = tok.next();
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392 int ind, buc;
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1
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393 if (!tsa(tok, token_lbrace)) return false;
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394 while (true) {
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395 char *have = tok.next();
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3
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396 if (!have) break;
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397 if (have == token_rbrace) break;
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398 if (have == token_index) {
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1
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399 have = tok.next();
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3
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400 ind = atoi(have);
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1
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401 if (!tsa(tok, token_semi)) return false;
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402 }
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3
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403 else if (have == token_bucket) {
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404 have = tok.next();
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405 buc = atoi(have);
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406 if (!tsa(tok, token_semi)) return false;
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1
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407 }
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408 else {
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3
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409 tok.token_error("index/bucket", have);
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1
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410 return false;
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411 }
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412 }
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413 if (!tsa(tok, token_semi)) return false;
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3
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414 PATTERNP patt = new PATTERN(tok, pat, ind, buc);
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415 con.add_pattern(patt);
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416 return true;
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417 }
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418
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419
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420 ////////////////////////////////////////////////
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421 //
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422 bool parse_ignore(TOKEN &tok, CONFIG &dc);
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423 bool parse_ignore(TOKEN &tok, CONFIG &dc) {
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424 if (!tsa(tok, token_lbrace)) return false;
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425 while (true) {
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426 char *have = tok.next();
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427 if (!have) break;
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428 if (have == token_rbrace) break;
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429 int ipaddr = ip_address(have);
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430 if (ipaddr == 0) {
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|
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431 tok.token_error("ip address", have);
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432 return false;
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433 }
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434 if (!tsa(tok, token_slash)) return false;
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435 have = tok.next();
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436 int mask = atoi(have);
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|
|
437 if ((mask < 8) || (mask > 32)) {
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|
|
438 tok.token_error("cidr 8..32 value", have);
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|
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439 return false;
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440 }
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|
|
441 if (!tsa(tok, token_semi)) return false;
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|
|
442 IPPAIR pair;
|
|
|
443 const int masks[33] = {0xffffffff, // 0
|
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444 0x7fffffff, // 1
|
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445 0x3fffffff, // 2
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446 0x1fffffff, // 3
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|
|
447 0x0fffffff, // 4
|
|
|
448 0x07ffffff, // 5
|
|
|
449 0x03ffffff, // 6
|
|
|
450 0x01ffffff, // 7
|
|
|
451 0x00ffffff, // 8
|
|
|
452 0x007fffff, // 9
|
|
|
453 0x003fffff, // 10
|
|
|
454 0x001fffff, // 11
|
|
|
455 0x000fffff, // 12
|
|
|
456 0x0007ffff, // 13
|
|
|
457 0x0003ffff, // 14
|
|
|
458 0x0001ffff, // 15
|
|
|
459 0x0000ffff, // 16
|
|
|
460 0x00007fff, // 17
|
|
|
461 0x00003fff, // 18
|
|
|
462 0x00001fff, // 19
|
|
|
463 0x00000fff, // 20
|
|
|
464 0x000007ff, // 21
|
|
|
465 0x000003ff, // 22
|
|
|
466 0x000001ff, // 23
|
|
|
467 0x000000ff, // 24
|
|
|
468 0x0000007f, // 25
|
|
|
469 0x0000003f, // 26
|
|
|
470 0x0000001f, // 27
|
|
|
471 0x0000000f, // 28
|
|
|
472 0x00000007, // 29
|
|
|
473 0x00000003, // 30
|
|
|
474 0x00000001, // 31
|
|
|
475 0x00000000}; // 32
|
|
|
476 pair.first = ipaddr;
|
|
|
477 pair.last = ipaddr | masks[mask];
|
|
|
478 pair.cidr = mask;
|
|
|
479 dc.add_pair(pair);
|
|
|
480 }
|
|
|
481 if (!tsa(tok, token_semi)) return false;
|
|
|
482 return true;
|
|
|
483 }
|
|
|
484
|
|
|
485
|
|
|
486 ////////////////////////////////////////////////
|
|
|
487 //
|
|
|
488 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc);
|
|
|
489 bool parse_syslogconfig(TOKEN &tok, CONFIG &dc) {
|
|
|
490 char *name = tok.next();
|
|
|
491 if (!tsa(tok, token_lbrace)) return false;
|
|
|
492 SYSLOGCONFIGP con = new SYSLOGCONFIG(tok, name);
|
|
2
|
493 if (con->failed()) {
|
|
|
494 delete con;
|
|
|
495 return false;
|
|
|
496 }
|
|
1
|
497 dc.add_syslogconfig(con);
|
|
3
|
498 while (true) {
|
|
|
499 char *have = tok.next();
|
|
|
500 if (!have) break;
|
|
|
501 if (have == token_rbrace) break;
|
|
|
502 if (have == token_pattern) {
|
|
|
503 if (!parse_pattern(tok, *con)) return false;
|
|
|
504 }
|
|
|
505 else {
|
|
|
506 tok.token_error("pattern", have);
|
|
|
507 return false;
|
|
|
508 }
|
|
|
509 }
|
|
|
510 if (!tsa(tok, token_semi)) return false;
|
|
1
|
511 return true;
|
|
|
512 }
|
|
|
513
|
|
|
514
|
|
|
515 ////////////////////////////////////////////////
|
|
|
516 // parse a config file
|
|
|
517 //
|
|
|
518 bool load_conf(CONFIG &dc, char *fn) {
|
|
|
519 int count = 0;
|
|
|
520 TOKEN tok(fn, &dc.config_files);
|
|
|
521 while (true) {
|
|
|
522 char *have = tok.next();
|
|
|
523 if (!have) break;
|
|
3
|
524 if (have == token_threshold) {
|
|
|
525 have = tok.next();
|
|
|
526 dc.set_threshold(atoi(have));
|
|
|
527 if (!tsa(tok, token_semi)) return false;
|
|
|
528 }
|
|
|
529 else if (have == token_ignore) {
|
|
|
530 if (!parse_ignore(tok, dc)) return false;
|
|
|
531 }
|
|
|
532 else if (have == token_file) {
|
|
|
533 if (!parse_syslogconfig(tok, dc)) return false;
|
|
|
534 count++;
|
|
1
|
535 }
|
|
|
536 else {
|
|
3
|
537 tok.token_error("threshold/ignore/file", have);
|
|
1
|
538 return false;
|
|
|
539 }
|
|
|
540 }
|
|
|
541 tok.token_error("load_conf() found %d syslog files in %s", count, fn);
|
|
|
542 return (!dc.syslogconfigs.empty());
|
|
|
543 }
|
|
|
544
|
|
|
545
|
|
|
546 ////////////////////////////////////////////////
|
|
|
547 // init the tokens
|
|
|
548 //
|
|
|
549 void token_init() {
|
|
3
|
550 token_bucket = register_string("bucket");
|
|
1
|
551 token_file = register_string("file");
|
|
3
|
552 token_ignore = register_string("ignore");
|
|
1
|
553 token_include = register_string("include");
|
|
3
|
554 token_index = register_string("index");
|
|
1
|
555 token_lbrace = register_string("{");
|
|
3
|
556 token_pattern = register_string("pattern");
|
|
1
|
557 token_rbrace = register_string("}");
|
|
|
558 token_semi = register_string(";");
|
|
3
|
559 token_slash = register_string("/");
|
|
|
560 token_threshold = register_string("threshold");
|
|
1
|
561 }
|
