annotate src/dccifd.cpp @ 460:ad05c61d6372 stable-6-0-74

add debug code for spf check with microsoft /14
author Carl Byington <carl@five-ten-sg.com>
date Mon, 24 Dec 2018 09:37:36 -0800
parents df7dc6b2b153
children 5209e92b4885
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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 const int maxlen = 1000; // used for snprintf buffers
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31 extern int NULL_SOCKET;
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32 const char *options = "header\n";
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33
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34
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35 ////////////////////////////////////////////////
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36 // helper to convert syslog control chars
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37 //
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38 string escaper(string v);
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39 string escaper(string v)
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40 {
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41 size_t n = v.length();
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42 char buf[n+1];
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43 strncpy(buf, v.c_str(), n);
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44 for (size_t i=0; i<n; i++) {
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45 if (buf[i] == '\r') buf[i] = 'r';
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46 if (buf[i] == '\n') buf[i] = 'n';
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47 if ((unsigned char)(buf[i]) < ' '){
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48 buf[i] = '.';
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49 }
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50 }
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51 return string(buf, n);
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52 }
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53
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54
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55 DccInterface::DccInterface(const char *port_, mlfiPriv *priv_, int ip, const char *helo_, const char *from)
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56 {
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57 err = false;
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58 first_recipient = true;
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59 first_header = true;
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60 priv = priv_;
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61 ip4 = ip;
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62 helo = helo_;
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63 envfrom = from;
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64 dccifd_port = port_;
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65 dccifd_socket = NULL_SOCKET;
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66 }
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67
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68
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69 DccInterface::~DccInterface()
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70 {
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71 my_disconnect();
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72 }
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73
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74
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75 void DccInterface::mlfi_envrcpt(SMFICTX *ctx, const char *envrcpt, bool grey)
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76 {
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77 if (first_recipient) {
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78 first_recipient = false;
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79 char adr[sizeof "255.255.255.255 "];
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80 adr[0] = '\0';
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81 inet_ntop(AF_INET, (const u_char *)&ip4, adr, sizeof(adr));
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82 // Validated sending site's address
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83 const char *rdns = getmacro(ctx, "_", "");
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84 char buf[maxlen+1];
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85 if (*rdns == '[') rdns = "";
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86 else {
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87 int n = 0;
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88 while ((n < maxlen) && rdns[n] && (rdns[n] != ' ')) n++;
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89 strncpy(buf, rdns, n);
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90 buf[n] = '\0';
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91 rdns = buf;
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92 }
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93 output(options);
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94 output(adr); output("\r");
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95 output(rdns); output("\n");
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96 output(helo); output("\n");
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97 output(envfrom); output("\n");
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98 }
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99 output(envrcpt);
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100 if (grey) output("\r\n");
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101 else output("\rdnsblnogrey\n");
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102 }
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103
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104
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105 void DccInterface::mlfi_header(SMFICTX *ctx, const char *headerf, const char *headerv)
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106 {
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107 if (dccifd_socket == NULL_SOCKET) Connect();
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108 if (err) return;
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109 if ((dccifd_socket != NULL_SOCKET) && (!dccifd_input.empty())) {
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110 output(dccifd_input);
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111 dccifd_input = "";
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112 }
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113
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114 if (first_header) {
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115 output("\n");
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116 first_header = false;
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117 }
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118
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119 output(headerf);
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120 output(": ");
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121 output(headerv);
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122 output("\r\n");
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123 }
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124
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125
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126 void DccInterface::mlfi_eoh()
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127 {
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128 output("\r\n");
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129 }
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130
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131
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132 void DccInterface::mlfi_body(const u_char *bodyp, size_t bodylen)
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133 {
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134 output((const char *)bodyp, bodylen);
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135 }
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136
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137
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138 void DccInterface::mlfi_eom(bool &grey, int &bulk)
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139 {
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140 // AnAnX-DCC-Rhyolite-Metrics: ns.five-ten-sg.com 104; Body=2 Fuz1=2nn
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141
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142 close_output(); // signal EOF to DccInterface
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143 input(); // read what the dcc has to say about this message
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144 my_syslog(priv, "dcc returned " + escaper(dccifd_output));
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145 grey = false;
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146 bulk = 0;
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147 const int n = dccifd_output.length();
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148 char buf[n+1];
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149 strncpy(buf, dccifd_output.c_str(), n);
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150 buf[n] = '\0';
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151
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152 int newlines = 0;
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153 int j, i = 0;
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154 while ((i<n) && (newlines < 2)) {
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155 switch (buf[i++]) {
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156 case 'G' :
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157 grey = true;
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158 break;
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159 case '\n' :
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160 newlines++;
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161 default : ;
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162 }
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163 }
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164
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165 // skip up to and including ;
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166 while ((i<n) && (buf[i++] != ';'));
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167
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168 // convert to lower, = to space, ctrl-chars to space
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169 for (j=i; j<n; j++) {
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170 buf[j] = tolower(buf[j]);
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171 if (buf[j] == '=') buf[j] = ' ';
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172 if (buf[j] < ' ') buf[j] = ' ';
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173 }
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174
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175 while (i<n) {
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176 // skip leading blanks
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177 while ((i<n) && (buf[i] == ' ')) i++;
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178
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179 // find blank terminator
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180 for (j=i; (j<n) && (buf[j] != ' '); j++);
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181
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182 // find anything?
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183 if (j > i) {
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184 // process this token
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185 buf[j] = '\0';
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186 //my_syslog(priv, string("dccifd token") + (buf+i));
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187 if (strcmp(buf+i, "bulk") == 0) bulk = dccbulk;
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188 else if (strcmp(buf+i, "many") == 0) bulk = dccbulk;
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189 else if (strcmp(buf+i, "whitelist") == 0) bulk = 0;
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190 else if (isdigit(buf[i])) {
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191 int b = atoi(buf+i);
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192 if (b > bulk) bulk = b;
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193 }
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194 // skip this token
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195 i = j+1;
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196 }
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197 }
227
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198 //char buff[maxlen];
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199 //snprintf(buff, sizeof(buff), "dccifd found grey %s bulk %d", ((grey) ? "yes" : "no"), bulk);
196
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200 //my_syslog(priv, buff);
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201 }
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202
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203
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204 void DccInterface::my_disconnect()
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205 {
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206 if (dccifd_socket != NULL_SOCKET) {
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207 shutdown(dccifd_socket, SHUT_RDWR);
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208 close(dccifd_socket);
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209 dccifd_socket = NULL_SOCKET;
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210 }
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211 }
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212
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213
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214 void DccInterface::Connect()
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215 {
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216 if (err) return;
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217
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218 sockaddr_un server;
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219 memset(&server, '\0', sizeof(server));
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220 server.sun_family = AF_UNIX;
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221 strncpy(server.sun_path, dccifd_port, sizeof(server.sun_path)-1);
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222 dccifd_socket = socket(AF_UNIX, SOCK_STREAM, 0);
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223 if (dccifd_socket != NULL_SOCKET) {
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224 bool rc = (connect(dccifd_socket, (sockaddr *)&server, sizeof(server)) == 0);
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225 if (!rc) {
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226 my_disconnect();
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227 err = true;
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228 }
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229 }
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230 }
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231
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232
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233 size_t DccInterface::my_write(const char *buf, size_t len) {
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234 if (err) return 0;
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235
196
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236 size_t rs = 0;
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237 while (len) {
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238 ssize_t ws = write(dccifd_socket, buf, len);
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239 if (ws > 0) {
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240 rs += ws;
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241 len -= ws;
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242 buf += ws;
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243 }
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244 else {
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245 // error or peer closed the socket!
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246 rs = 0;
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247 err = true;
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248 break;
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249 }
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250 }
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251 return rs;
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252 }
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253
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254 size_t DccInterface::my_read(char *buf, size_t len) {
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255 if (err) return 0;
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256
196
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257 size_t rs = 0;
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258 while (len) {
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259 ssize_t ws = read(dccifd_socket, buf, len);
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260 if (ws > 0) {
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261 rs += ws;
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262 len -= ws;
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263 buf += ws;
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264 }
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265 else if (ws < 0) {
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266 // read error
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267 rs = 0;
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268 err = true;
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269 break;
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270 }
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271 else {
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272 // peer closed the socket, end of file
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273 break;
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274 }
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275 }
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276 return rs;
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277 }
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278
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279 void DccInterface::output(const char* buffer, size_t size)
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280 {
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281 if (err) return;
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282
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283 // buffer it if not connected yet
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284 if (dccifd_socket == NULL_SOCKET) {
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285 //my_syslog(priv, string("dcc buffered ") + escaper(string(buffer, size)));
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286 dccifd_input.append(buffer, size);
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287 return;
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288 }
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289
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290 // write it if we are connected
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291 //my_syslog(priv, string("dcc write ") + escaper(string(buffer, size)));
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292 my_write(buffer, size);
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293 }
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294
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295
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296 void DccInterface::output(const char* buffer)
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297 {
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298 output(buffer, strlen(buffer));
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299 }
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300
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301
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302 void DccInterface::output(string buffer)
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303 {
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304 output(buffer.c_str(), buffer.size());
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305 }
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306
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307
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308 void DccInterface::close_output()
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309 {
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310 if (dccifd_socket != NULL_SOCKET) {
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311 shutdown(dccifd_socket, SHUT_WR);
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312 }
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313 }
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314
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315
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316 void DccInterface::input()
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317 {
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318 if ((dccifd_socket == NULL_SOCKET) || err) return;
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319 char buf[maxlen];
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320 int rs;
214
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diff changeset
321 while ((rs = my_read(buf, maxlen))) {
196
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322 //my_syslog(priv, string("dcc read ") + escaper(string(buf, rs)));
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323 dccifd_output.append(buf, rs);
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324 }
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325 my_disconnect();
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326 }
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327
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328
214
82886d4dd71f Fixes to compile on Fedora 9 and for const correctness.
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parents: 203
diff changeset
329 const char *DccInterface::getmacro(SMFICTX *ctx, const char *macro, const char *def)
196
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330 {
214
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parents: 203
diff changeset
331 const char *rc = smfi_getsymval(ctx, (char*)macro);
196
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332 if (!rc) rc = def;
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333 return rc;
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334 }
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335
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336