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annotate src/dccifd.cpp @ 407:29d54e7028f6 stable-6-0-54
document dmarc vs dnsbl dkim/spf; switch to . rather than " " for dkim impossible signer
| author | Carl Byington <carl@five-ten-sg.com> |
|---|---|
| date | Thu, 30 Mar 2017 10:26:30 -0700 |
| parents | df7dc6b2b153 |
| children | 5209e92b4885 |
| rev | line source |
|---|---|
| 196 | 1 /* |
| 2 | |
| 3 Copyright (c) 2007 Carl Byington - 510 Software Group, released under | |
| 4 the GPL version 3 or any later version at your choice available at | |
| 5 http://www.gnu.org/licenses/gpl-3.0.txt | |
| 6 | |
| 7 */ | |
| 8 | |
| 9 #include "includes.h" | |
| 10 #include <errno.h> | |
| 11 #include <fcntl.h> | |
| 12 #include <poll.h> | |
| 13 #include <signal.h> | |
| 14 #include <string> | |
| 15 #include <sys/types.h> | |
| 16 #include <sys/wait.h> | |
| 17 #include <unistd.h> | |
| 18 | |
| 19 // needed for socket io | |
| 20 #include <sys/ioctl.h> | |
| 21 #include <net/if.h> | |
| 22 #include <arpa/inet.h> | |
| 23 #include <netinet/in.h> | |
| 24 #include <netinet/tcp.h> | |
| 25 #include <netdb.h> | |
| 26 #include <sys/socket.h> | |
| 27 #include <sys/un.h> | |
| 28 | |
| 29 | |
| 30 const int maxlen = 1000; // used for snprintf buffers | |
| 31 extern int NULL_SOCKET; | |
| 32 const char *options = "header\n"; | |
| 33 | |
| 34 | |
| 35 //////////////////////////////////////////////// | |
| 36 // helper to convert syslog control chars | |
| 37 // | |
| 38 string escaper(string v); | |
| 39 string escaper(string v) | |
| 40 { | |
| 41 size_t n = v.length(); | |
| 42 char buf[n+1]; | |
| 43 strncpy(buf, v.c_str(), n); | |
| 44 for (size_t i=0; i<n; i++) { | |
| 45 if (buf[i] == '\r') buf[i] = 'r'; | |
| 46 if (buf[i] == '\n') buf[i] = 'n'; | |
| 47 if ((unsigned char)(buf[i]) < ' '){ | |
| 48 buf[i] = '.'; | |
| 49 } | |
| 50 } | |
| 51 return string(buf, n); | |
| 52 } | |
| 53 | |
| 54 | |
|
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55 DccInterface::DccInterface(const char *port_, mlfiPriv *priv_, int ip, const char *helo_, const char *from) |
| 196 | 56 { |
| 57 err = false; | |
| 58 first_recipient = true; | |
| 59 first_header = true; | |
| 60 priv = priv_; | |
| 61 ip4 = ip; | |
| 62 helo = helo_; | |
| 63 envfrom = from; | |
| 64 dccifd_port = port_; | |
| 65 dccifd_socket = NULL_SOCKET; | |
| 66 } | |
| 67 | |
| 68 | |
| 69 DccInterface::~DccInterface() | |
| 70 { | |
| 71 my_disconnect(); | |
| 72 } | |
| 73 | |
| 74 | |
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75 void DccInterface::mlfi_envrcpt(SMFICTX *ctx, const char *envrcpt, bool grey) |
| 196 | 76 { |
| 77 if (first_recipient) { | |
| 78 first_recipient = false; | |
| 79 char adr[sizeof "255.255.255.255 "]; | |
| 80 adr[0] = '\0'; | |
| 81 inet_ntop(AF_INET, (const u_char *)&ip4, adr, sizeof(adr)); | |
| 82 // Validated sending site's address | |
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83 const char *rdns = getmacro(ctx, "_", ""); |
| 196 | 84 char buf[maxlen+1]; |
| 85 if (*rdns == '[') rdns = ""; | |
| 86 else { | |
| 87 int n = 0; | |
| 88 while ((n < maxlen) && rdns[n] && (rdns[n] != ' ')) n++; | |
| 89 strncpy(buf, rdns, n); | |
| 90 buf[n] = '\0'; | |
| 91 rdns = buf; | |
| 92 } | |
| 93 output(options); | |
| 94 output(adr); output("\r"); | |
| 95 output(rdns); output("\n"); | |
| 96 output(helo); output("\n"); | |
| 97 output(envfrom); output("\n"); | |
| 98 } | |
| 99 output(envrcpt); | |
| 100 if (grey) output("\r\n"); | |
| 101 else output("\rdnsblnogrey\n"); | |
| 102 } | |
| 103 | |
| 104 | |
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105 void DccInterface::mlfi_header(SMFICTX *ctx, const char *headerf, const char *headerv) |
| 196 | 106 { |
| 107 if (dccifd_socket == NULL_SOCKET) Connect(); | |
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108 if (err) return; |
| 196 | 109 if ((dccifd_socket != NULL_SOCKET) && (!dccifd_input.empty())) { |
| 110 output(dccifd_input); | |
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111 dccifd_input = ""; |
| 196 | 112 } |
| 113 | |
| 114 if (first_header) { | |
| 115 output("\n"); | |
| 116 first_header = false; | |
| 117 } | |
| 118 | |
| 119 output(headerf); | |
| 120 output(": "); | |
| 121 output(headerv); | |
| 122 output("\r\n"); | |
| 123 } | |
| 124 | |
| 125 | |
| 126 void DccInterface::mlfi_eoh() | |
| 127 { | |
| 128 output("\r\n"); | |
| 129 } | |
| 130 | |
| 131 | |
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132 void DccInterface::mlfi_body(const u_char *bodyp, size_t bodylen) |
| 196 | 133 { |
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134 output((const char *)bodyp, bodylen); |
| 196 | 135 } |
| 136 | |
| 137 | |
| 138 void DccInterface::mlfi_eom(bool &grey, int &bulk) | |
| 139 { | |
| 140 // AnAnX-DCC-Rhyolite-Metrics: ns.five-ten-sg.com 104; Body=2 Fuz1=2nn | |
| 141 | |
| 142 close_output(); // signal EOF to DccInterface | |
| 143 input(); // read what the dcc has to say about this message | |
| 144 my_syslog(priv, "dcc returned " + escaper(dccifd_output)); | |
| 145 grey = false; | |
| 146 bulk = 0; | |
| 147 const int n = dccifd_output.length(); | |
| 148 char buf[n+1]; | |
| 149 strncpy(buf, dccifd_output.c_str(), n); | |
| 150 buf[n] = '\0'; | |
| 151 | |
| 152 int newlines = 0; | |
| 153 int j, i = 0; | |
| 154 while ((i<n) && (newlines < 2)) { | |
| 155 switch (buf[i++]) { | |
| 156 case 'G' : | |
| 157 grey = true; | |
| 158 break; | |
| 159 case '\n' : | |
| 160 newlines++; | |
| 161 default : ; | |
| 162 } | |
| 163 } | |
| 164 | |
| 165 // skip up to and including ; | |
| 166 while ((i<n) && (buf[i++] != ';')); | |
| 167 | |
| 168 // convert to lower, = to space, ctrl-chars to space | |
| 169 for (j=i; j<n; j++) { | |
| 170 buf[j] = tolower(buf[j]); | |
| 171 if (buf[j] == '=') buf[j] = ' '; | |
| 172 if (buf[j] < ' ') buf[j] = ' '; | |
| 173 } | |
| 174 | |
| 175 while (i<n) { | |
| 176 // skip leading blanks | |
| 177 while ((i<n) && (buf[i] == ' ')) i++; | |
| 178 | |
| 179 // find blank terminator | |
| 180 for (j=i; (j<n) && (buf[j] != ' '); j++); | |
| 181 | |
| 182 // find anything? | |
| 183 if (j > i) { | |
| 184 // process this token | |
| 185 buf[j] = '\0'; | |
| 186 //my_syslog(priv, string("dccifd token") + (buf+i)); | |
| 187 if (strcmp(buf+i, "bulk") == 0) bulk = dccbulk; | |
| 188 else if (strcmp(buf+i, "many") == 0) bulk = dccbulk; | |
| 189 else if (strcmp(buf+i, "whitelist") == 0) bulk = 0; | |
| 190 else if (isdigit(buf[i])) { | |
| 191 int b = atoi(buf+i); | |
| 192 if (b > bulk) bulk = b; | |
| 193 } | |
| 194 // skip this token | |
| 195 i = j+1; | |
| 196 } | |
| 197 } | |
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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 | 200 //my_syslog(priv, buff); |
| 201 } | |
| 202 | |
| 203 | |
| 204 void DccInterface::my_disconnect() | |
| 205 { | |
| 206 if (dccifd_socket != NULL_SOCKET) { | |
| 207 shutdown(dccifd_socket, SHUT_RDWR); | |
| 208 close(dccifd_socket); | |
| 209 dccifd_socket = NULL_SOCKET; | |
| 210 } | |
| 211 } | |
| 212 | |
| 213 | |
| 214 void DccInterface::Connect() | |
| 215 { | |
| 216 if (err) return; | |
| 217 | |
| 218 sockaddr_un server; | |
| 219 memset(&server, '\0', sizeof(server)); | |
| 220 server.sun_family = AF_UNIX; | |
| 221 strncpy(server.sun_path, dccifd_port, sizeof(server.sun_path)-1); | |
| 222 dccifd_socket = socket(AF_UNIX, SOCK_STREAM, 0); | |
| 223 if (dccifd_socket != NULL_SOCKET) { | |
| 224 bool rc = (connect(dccifd_socket, (sockaddr *)&server, sizeof(server)) == 0); | |
| 225 if (!rc) { | |
| 226 my_disconnect(); | |
| 227 err = true; | |
| 228 } | |
| 229 } | |
| 230 } | |
| 231 | |
| 232 | |
| 233 size_t DccInterface::my_write(const char *buf, size_t len) { | |
| 234 if (err) return 0; | |
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235 |
| 196 | 236 size_t rs = 0; |
| 237 while (len) { | |
| 238 ssize_t ws = write(dccifd_socket, buf, len); | |
| 239 if (ws > 0) { | |
| 240 rs += ws; | |
| 241 len -= ws; | |
| 242 buf += ws; | |
| 243 } | |
| 244 else { | |
| 245 // error or peer closed the socket! | |
| 246 rs = 0; | |
| 247 err = true; | |
| 248 break; | |
| 249 } | |
| 250 } | |
| 251 return rs; | |
| 252 } | |
| 253 | |
| 254 size_t DccInterface::my_read(char *buf, size_t len) { | |
| 255 if (err) return 0; | |
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parents:
227
diff
changeset
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256 |
| 196 | 257 size_t rs = 0; |
| 258 while (len) { | |
| 259 ssize_t ws = read(dccifd_socket, buf, len); | |
| 260 if (ws > 0) { | |
| 261 rs += ws; | |
| 262 len -= ws; | |
| 263 buf += ws; | |
| 264 } | |
| 265 else if (ws < 0) { | |
| 266 // read error | |
| 267 rs = 0; | |
| 268 err = true; | |
| 269 break; | |
| 270 } | |
| 271 else { | |
| 272 // peer closed the socket, end of file | |
| 273 break; | |
| 274 } | |
| 275 } | |
| 276 return rs; | |
| 277 } | |
| 278 | |
| 279 void DccInterface::output(const char* buffer, size_t size) | |
| 280 { | |
| 281 if (err) return; | |
| 282 | |
| 283 // buffer it if not connected yet | |
| 284 if (dccifd_socket == NULL_SOCKET) { | |
| 285 //my_syslog(priv, string("dcc buffered ") + escaper(string(buffer, size))); | |
| 286 dccifd_input.append(buffer, size); | |
| 287 return; | |
| 288 } | |
| 289 | |
| 290 // write it if we are connected | |
| 291 //my_syslog(priv, string("dcc write ") + escaper(string(buffer, size))); | |
| 292 my_write(buffer, size); | |
| 293 } | |
| 294 | |
| 295 | |
| 296 void DccInterface::output(const char* buffer) | |
| 297 { | |
| 298 output(buffer, strlen(buffer)); | |
| 299 } | |
| 300 | |
| 301 | |
| 302 void DccInterface::output(string buffer) | |
| 303 { | |
| 304 output(buffer.c_str(), buffer.size()); | |
| 305 } | |
| 306 | |
| 307 | |
| 308 void DccInterface::close_output() | |
| 309 { | |
| 310 if (dccifd_socket != NULL_SOCKET) { | |
| 311 shutdown(dccifd_socket, SHUT_WR); | |
| 312 } | |
| 313 } | |
| 314 | |
| 315 | |
| 316 void DccInterface::input() | |
| 317 { | |
| 318 if ((dccifd_socket == NULL_SOCKET) || err) return; | |
| 319 char buf[maxlen]; | |
| 320 int rs; | |
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parents:
203
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321 while ((rs = my_read(buf, maxlen))) { |
| 196 | 322 //my_syslog(priv, string("dcc read ") + escaper(string(buf, rs))); |
| 323 dccifd_output.append(buf, rs); | |
| 324 } | |
| 325 my_disconnect(); | |
| 326 } | |
| 327 | |
| 328 | |
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329 const char *DccInterface::getmacro(SMFICTX *ctx, const char *macro, const char *def) |
| 196 | 330 { |
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203
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331 const char *rc = smfi_getsymval(ctx, (char*)macro); |
| 196 | 332 if (!rc) rc = def; |
| 333 return rc; | |
| 334 } | |
| 335 | |
| 336 |