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196
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1 /*
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2
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3 Copyright (c) 2007 Carl Byington - 510 Software Group, released under
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4 the GPL version 3 or any later version at your choice available at
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5 http://www.gnu.org/licenses/gpl-3.0.txt
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6
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7 */
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8
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9 #include "includes.h"
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10 #include <errno.h>
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11 #include <fcntl.h>
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12 #include <poll.h>
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13 #include <signal.h>
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14 #include <string>
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15 #include <sys/types.h>
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16 #include <sys/wait.h>
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17 #include <unistd.h>
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18
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19 // needed for socket io
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20 #include <sys/ioctl.h>
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21 #include <net/if.h>
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22 #include <arpa/inet.h>
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23 #include <netinet/in.h>
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24 #include <netinet/tcp.h>
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25 #include <netdb.h>
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26 #include <sys/socket.h>
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27 #include <sys/un.h>
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28
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29
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30
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31 static const char Id[] = "$Id$";
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32
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33 const int maxlen = 1000; // used for snprintf buffers
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34 extern int NULL_SOCKET;
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35 const char *options = "header\n";
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36
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37
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38 ////////////////////////////////////////////////
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39 // helper to convert syslog control chars
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40 //
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41 string escaper(string v);
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42 string escaper(string v)
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43 {
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44 size_t n = v.length();
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45 char buf[n+1];
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46 strncpy(buf, v.c_str(), n);
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47 for (size_t i=0; i<n; i++) {
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48 if (buf[i] == '\r') buf[i] = 'r';
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49 if (buf[i] == '\n') buf[i] = 'n';
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50 if ((unsigned char)(buf[i]) < ' '){
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51 buf[i] = '.';
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52 }
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53 }
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54 return string(buf, n);
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55 }
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56
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57
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58 DccInterface::DccInterface(char *port_, mlfiPriv *priv_, int ip, char *helo_, char *from)
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59 {
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60 err = false;
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61 first_recipient = true;
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62 first_header = true;
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63 priv = priv_;
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64 ip4 = ip;
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65 helo = helo_;
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66 envfrom = from;
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67 dccifd_port = port_;
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68 dccifd_socket = NULL_SOCKET;
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69 }
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70
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71
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72 DccInterface::~DccInterface()
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73 {
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74 my_disconnect();
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75 }
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76
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77
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78 void DccInterface::mlfi_envrcpt(SMFICTX *ctx, char *envrcpt, bool grey)
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79 {
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80 if (first_recipient) {
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81 first_recipient = false;
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82 char adr[sizeof "255.255.255.255 "];
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83 adr[0] = '\0';
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84 inet_ntop(AF_INET, (const u_char *)&ip4, adr, sizeof(adr));
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85 // Validated sending site's address
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86 char *rdns = getmacro(ctx, "_", "");
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87 char buf[maxlen+1];
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88 if (*rdns == '[') rdns = "";
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89 else {
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90 int n = 0;
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91 while ((n < maxlen) && rdns[n] && (rdns[n] != ' ')) n++;
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92 strncpy(buf, rdns, n);
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93 buf[n] = '\0';
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94 rdns = buf;
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95 }
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96 output(options);
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97 output(adr); output("\r");
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98 output(rdns); output("\n");
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99 //output("4.3.2.1\r\n"); // !! not local whitelisting
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100 output(helo); output("\n");
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101 output(envfrom); output("\n");
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102 }
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103 output(envrcpt);
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104 if (grey) output("\r\n");
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105 else output("\rdnsblnogrey\n");
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106 }
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107
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108
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109 void DccInterface::mlfi_header(SMFICTX *ctx, char* headerf, char* headerv)
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110 {
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111 if (dccifd_socket == NULL_SOCKET) Connect();
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112 if ((dccifd_socket != NULL_SOCKET) && (!dccifd_input.empty())) {
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113 output(dccifd_input);
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114 dccifd_input.clear();
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115 }
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116
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117 if (first_header) {
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118 output("\n");
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119 first_header = false;
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120 }
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121
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122 output(headerf);
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123 output(": ");
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124 output(headerv);
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125 output("\r\n");
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126 }
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127
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128
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129 void DccInterface::mlfi_eoh()
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130 {
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131 output("\r\n");
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132 }
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133
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134
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135 void DccInterface::mlfi_body(u_char *bodyp, size_t bodylen)
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136 {
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137 output((char *)bodyp, bodylen);
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138 }
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139
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140
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141 void DccInterface::mlfi_eom(bool &grey, int &bulk)
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142 {
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143 // AnAnX-DCC-Rhyolite-Metrics: ns.five-ten-sg.com 104; Body=2 Fuz1=2nn
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144
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145 close_output(); // signal EOF to DccInterface
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146 input(); // read what the dcc has to say about this message
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147 my_syslog(priv, "dcc returned " + escaper(dccifd_output));
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148 grey = false;
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149 bulk = 0;
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150 const int n = dccifd_output.length();
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151 char buf[n+1];
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152 strncpy(buf, dccifd_output.c_str(), n);
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153 buf[n] = '\0';
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154
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155 int newlines = 0;
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156 int j, i = 0;
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157 while ((i<n) && (newlines < 2)) {
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158 switch (buf[i++]) {
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159 case 'G' :
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160 grey = true;
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161 break;
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162 case '\n' :
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163 newlines++;
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164 default : ;
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165 }
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166 }
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167
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168 // skip up to and including ;
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169 while ((i<n) && (buf[i++] != ';'));
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170
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171 // convert to lower, = to space, ctrl-chars to space
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172 for (j=i; j<n; j++) {
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173 buf[j] = tolower(buf[j]);
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174 if (buf[j] == '=') buf[j] = ' ';
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175 if (buf[j] < ' ') buf[j] = ' ';
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176 }
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177
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178 while (i<n) {
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179 // skip leading blanks
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180 while ((i<n) && (buf[i] == ' ')) i++;
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181
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182 // find blank terminator
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183 for (j=i; (j<n) && (buf[j] != ' '); j++);
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184
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185 // find anything?
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186 if (j > i) {
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187 // process this token
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188 buf[j] = '\0';
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189 //my_syslog(priv, string("dccifd token") + (buf+i));
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190 if (strcmp(buf+i, "bulk") == 0) bulk = dccbulk;
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191 else if (strcmp(buf+i, "many") == 0) bulk = dccbulk;
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192 else if (strcmp(buf+i, "whitelist") == 0) bulk = 0;
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193 else if (isdigit(buf[i])) {
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194 int b = atoi(buf+i);
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195 if (b > bulk) bulk = b;
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196 }
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197 // skip this token
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198 i = j+1;
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199 }
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200 }
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201 char buff[maxlen];
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202 snprintf(buff, sizeof(buff), "dccifd found grey %s bulk %d", ((grey) ? "yes" : "no"), bulk);
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203 //my_syslog(priv, buff);
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204 }
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205
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206
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207 void DccInterface::my_disconnect()
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208 {
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209 if (dccifd_socket != NULL_SOCKET) {
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210 shutdown(dccifd_socket, SHUT_RDWR);
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211 close(dccifd_socket);
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212 dccifd_socket = NULL_SOCKET;
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213 }
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214 }
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215
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216
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217 void DccInterface::Connect()
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218 {
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219 if (err) return;
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220
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221 sockaddr_un server;
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222 memset(&server, '\0', sizeof(server));
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223 server.sun_family = AF_UNIX;
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224 strncpy(server.sun_path, dccifd_port, sizeof(server.sun_path)-1);
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225 dccifd_socket = socket(AF_UNIX, SOCK_STREAM, 0);
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226 if (dccifd_socket != NULL_SOCKET) {
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227 bool rc = (connect(dccifd_socket, (sockaddr *)&server, sizeof(server)) == 0);
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228 if (!rc) {
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229 my_disconnect();
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230 err = true;
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231 }
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232 }
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233 }
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234
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235
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236 size_t DccInterface::my_write(const char *buf, size_t len) {
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237 if (err) return 0;
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238 size_t rs = 0;
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239 while (len) {
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240 ssize_t ws = write(dccifd_socket, buf, len);
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241 if (ws > 0) {
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242 rs += ws;
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243 len -= ws;
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244 buf += ws;
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245 }
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246 else {
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247 // error or peer closed the socket!
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248 rs = 0;
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249 err = true;
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250 break;
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251 }
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252 }
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253 return rs;
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254 }
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255
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256 size_t DccInterface::my_read(char *buf, size_t len) {
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257 if (err) return 0;
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258 size_t rs = 0;
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259 while (len) {
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260 ssize_t ws = read(dccifd_socket, buf, len);
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261 if (ws > 0) {
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262 rs += ws;
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263 len -= ws;
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264 buf += ws;
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265 }
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266 else if (ws < 0) {
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267 // read error
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268 rs = 0;
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269 err = true;
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270 break;
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271 }
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272 else {
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273 // peer closed the socket, end of file
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274 break;
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275 }
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276 }
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277 return rs;
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278 }
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279
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280 void DccInterface::output(const char* buffer, size_t size)
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281 {
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282 // if there are problems, fail.
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283 if (err) return;
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284
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285 // buffer it if not connected yet
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286 if (dccifd_socket == NULL_SOCKET) {
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287 //my_syslog(priv, string("dcc buffered ") + escaper(string(buffer, size)));
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288 dccifd_input.append(buffer, size);
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289 return;
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290 }
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291
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292 // write it if we are connected
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293 //my_syslog(priv, string("dcc write ") + escaper(string(buffer, size)));
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294 my_write(buffer, size);
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295 }
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296
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297
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298 void DccInterface::output(const char* buffer)
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299 {
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300 output(buffer, strlen(buffer));
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301 }
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302
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303
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304 void DccInterface::output(string buffer)
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305 {
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306 output(buffer.c_str(), buffer.size());
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307 }
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308
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309
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310 void DccInterface::close_output()
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311 {
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312 if (dccifd_socket != NULL_SOCKET) {
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313 shutdown(dccifd_socket, SHUT_WR);
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314 }
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315 }
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316
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317
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318 void DccInterface::input()
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319 {
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320 if ((dccifd_socket == NULL_SOCKET) || err) return;
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321 char buf[maxlen];
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322 int rs;
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323 while (rs = my_read(buf, maxlen)) {
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324 //my_syslog(priv, string("dcc read ") + escaper(string(buf, rs)));
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325 dccifd_output.append(buf, rs);
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326 }
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327 my_disconnect();
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328 }
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329
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330
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331 char *DccInterface::getmacro(SMFICTX *ctx, char *macro, char *def)
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332 {
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333 char *rc = smfi_getsymval(ctx, macro);
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334 if (!rc) rc = def;
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335 return rc;
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336 }
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337
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338
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