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comparison src/dccifd.cpp @ 196:ff6d14d75b1e

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add missing files to cvs
author carl
date Sat, 02 Feb 2008 10:08:08 -0800
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children 92a5c866bdfa
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195:797299e9fffc 196:ff6d14d75b1e
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
31 static const char Id[] = "$Id$";
32
33 const int maxlen = 1000; // used for snprintf buffers
34 extern int NULL_SOCKET;
35 const char *options = "header\n";
36
37
38 ////////////////////////////////////////////////
39 // helper to convert syslog control chars
40 //
41 string escaper(string v);
42 string escaper(string v)
43 {
44 size_t n = v.length();
45 char buf[n+1];
46 strncpy(buf, v.c_str(), n);
47 for (size_t i=0; i<n; i++) {
48 if (buf[i] == '\r') buf[i] = 'r';
49 if (buf[i] == '\n') buf[i] = 'n';
50 if ((unsigned char)(buf[i]) < ' '){
51 buf[i] = '.';
52 }
53 }
54 return string(buf, n);
55 }
56
57
58 DccInterface::DccInterface(char *port_, mlfiPriv *priv_, int ip, char *helo_, char *from)
59 {
60 err = false;
61 first_recipient = true;
62 first_header = true;
63 priv = priv_;
64 ip4 = ip;
65 helo = helo_;
66 envfrom = from;
67 dccifd_port = port_;
68 dccifd_socket = NULL_SOCKET;
69 }
70
71
72 DccInterface::~DccInterface()
73 {
74 my_disconnect();
75 }
76
77
78 void DccInterface::mlfi_envrcpt(SMFICTX *ctx, char *envrcpt, bool grey)
79 {
80 if (first_recipient) {
81 first_recipient = false;
82 char adr[sizeof "255.255.255.255 "];
83 adr[0] = '\0';
84 inet_ntop(AF_INET, (const u_char *)&ip4, adr, sizeof(adr));
85 // Validated sending site's address
86 char *rdns = getmacro(ctx, "_", "");
87 char buf[maxlen+1];
88 if (*rdns == '[') rdns = "";
89 else {
90 int n = 0;
91 while ((n < maxlen) && rdns[n] && (rdns[n] != ' ')) n++;
92 strncpy(buf, rdns, n);
93 buf[n] = '\0';
94 rdns = buf;
95 }
96 output(options);
97 output(adr); output("\r");
98 output(rdns); output("\n");
99 //output("4.3.2.1\r\n"); // !! not local whitelisting
100 output(helo); output("\n");
101 output(envfrom); output("\n");
102 }
103 output(envrcpt);
104 if (grey) output("\r\n");
105 else output("\rdnsblnogrey\n");
106 }
107
108
109 void DccInterface::mlfi_header(SMFICTX *ctx, char* headerf, char* headerv)
110 {
111 if (dccifd_socket == NULL_SOCKET) Connect();
112 if ((dccifd_socket != NULL_SOCKET) && (!dccifd_input.empty())) {
113 output(dccifd_input);
114 dccifd_input.clear();
115 }
116
117 if (first_header) {
118 output("\n");
119 first_header = false;
120 }
121
122 output(headerf);
123 output(": ");
124 output(headerv);
125 output("\r\n");
126 }
127
128
129 void DccInterface::mlfi_eoh()
130 {
131 output("\r\n");
132 }
133
134
135 void DccInterface::mlfi_body(u_char *bodyp, size_t bodylen)
136 {
137 output((char *)bodyp, bodylen);
138 }
139
140
141 void DccInterface::mlfi_eom(bool &grey, int &bulk)
142 {
143 // AnAnX-DCC-Rhyolite-Metrics: ns.five-ten-sg.com 104; Body=2 Fuz1=2nn
144
145 close_output(); // signal EOF to DccInterface
146 input(); // read what the dcc has to say about this message
147 my_syslog(priv, "dcc returned " + escaper(dccifd_output));
148 grey = false;
149 bulk = 0;
150 const int n = dccifd_output.length();
151 char buf[n+1];
152 strncpy(buf, dccifd_output.c_str(), n);
153 buf[n] = '\0';
154
155 int newlines = 0;
156 int j, i = 0;
157 while ((i<n) && (newlines < 2)) {
158 switch (buf[i++]) {
159 case 'G' :
160 grey = true;
161 break;
162 case '\n' :
163 newlines++;
164 default : ;
165 }
166 }
167
168 // skip up to and including ;
169 while ((i<n) && (buf[i++] != ';'));
170
171 // convert to lower, = to space, ctrl-chars to space
172 for (j=i; j<n; j++) {
173 buf[j] = tolower(buf[j]);
174 if (buf[j] == '=') buf[j] = ' ';
175 if (buf[j] < ' ') buf[j] = ' ';
176 }
177
178 while (i<n) {
179 // skip leading blanks
180 while ((i<n) && (buf[i] == ' ')) i++;
181
182 // find blank terminator
183 for (j=i; (j<n) && (buf[j] != ' '); j++);
184
185 // find anything?
186 if (j > i) {
187 // process this token
188 buf[j] = '\0';
189 //my_syslog(priv, string("dccifd token") + (buf+i));
190 if (strcmp(buf+i, "bulk") == 0) bulk = dccbulk;
191 else if (strcmp(buf+i, "many") == 0) bulk = dccbulk;
192 else if (strcmp(buf+i, "whitelist") == 0) bulk = 0;
193 else if (isdigit(buf[i])) {
194 int b = atoi(buf+i);
195 if (b > bulk) bulk = b;
196 }
197 // skip this token
198 i = j+1;
199 }
200 }
201 char buff[maxlen];
202 snprintf(buff, sizeof(buff), "dccifd found grey %s bulk %d", ((grey) ? "yes" : "no"), bulk);
203 //my_syslog(priv, buff);
204 }
205
206
207 void DccInterface::my_disconnect()
208 {
209 if (dccifd_socket != NULL_SOCKET) {
210 shutdown(dccifd_socket, SHUT_RDWR);
211 close(dccifd_socket);
212 dccifd_socket = NULL_SOCKET;
213 }
214 }
215
216
217 void DccInterface::Connect()
218 {
219 if (err) return;
220
221 sockaddr_un server;
222 memset(&server, '\0', sizeof(server));
223 server.sun_family = AF_UNIX;
224 strncpy(server.sun_path, dccifd_port, sizeof(server.sun_path)-1);
225 dccifd_socket = socket(AF_UNIX, SOCK_STREAM, 0);
226 if (dccifd_socket != NULL_SOCKET) {
227 bool rc = (connect(dccifd_socket, (sockaddr *)&server, sizeof(server)) == 0);
228 if (!rc) {
229 my_disconnect();
230 err = true;
231 }
232 }
233 }
234
235
236 size_t DccInterface::my_write(const char *buf, size_t len) {
237 if (err) return 0;
238 size_t rs = 0;
239 while (len) {
240 ssize_t ws = write(dccifd_socket, buf, len);
241 if (ws > 0) {
242 rs += ws;
243 len -= ws;
244 buf += ws;
245 }
246 else {
247 // error or peer closed the socket!
248 rs = 0;
249 err = true;
250 break;
251 }
252 }
253 return rs;
254 }
255
256 size_t DccInterface::my_read(char *buf, size_t len) {
257 if (err) return 0;
258 size_t rs = 0;
259 while (len) {
260 ssize_t ws = read(dccifd_socket, buf, len);
261 if (ws > 0) {
262 rs += ws;
263 len -= ws;
264 buf += ws;
265 }
266 else if (ws < 0) {
267 // read error
268 rs = 0;
269 err = true;
270 break;
271 }
272 else {
273 // peer closed the socket, end of file
274 break;
275 }
276 }
277 return rs;
278 }
279
280 void DccInterface::output(const char* buffer, size_t size)
281 {
282 // if there are problems, fail.
283 if (err) return;
284
285 // buffer it if not connected yet
286 if (dccifd_socket == NULL_SOCKET) {
287 //my_syslog(priv, string("dcc buffered ") + escaper(string(buffer, size)));
288 dccifd_input.append(buffer, size);
289 return;
290 }
291
292 // write it if we are connected
293 //my_syslog(priv, string("dcc write ") + escaper(string(buffer, size)));
294 my_write(buffer, size);
295 }
296
297
298 void DccInterface::output(const char* buffer)
299 {
300 output(buffer, strlen(buffer));
301 }
302
303
304 void DccInterface::output(string buffer)
305 {
306 output(buffer.c_str(), buffer.size());
307 }
308
309
310 void DccInterface::close_output()
311 {
312 if (dccifd_socket != NULL_SOCKET) {
313 shutdown(dccifd_socket, SHUT_WR);
314 }
315 }
316
317
318 void DccInterface::input()
319 {
320 if ((dccifd_socket == NULL_SOCKET) || err) return;
321 char buf[maxlen];
322 int rs;
323 while (rs = my_read(buf, maxlen)) {
324 //my_syslog(priv, string("dcc read ") + escaper(string(buf, rs)));
325 dccifd_output.append(buf, rs);
326 }
327 my_disconnect();
328 }
329
330
331 char *DccInterface::getmacro(SMFICTX *ctx, char *macro, char *def)
332 {
333 char *rc = smfi_getsymval(ctx, macro);
334 if (!rc) rc = def;
335 return rc;
336 }
337
338