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1.1 paf 1: /** @file
2: Parser: SMTP sender.
3:
1.2 ! paf 4: Copyright (c) 2001-2004 ArtLebedev Group (http://www.artlebedev.com)
1.1 paf 5: Author: Alexandr Petrosian <paf@design.ru> (http://paf.design.ru)
6:
7: Parts of the code here is based upon an early gensock and blat
8: */
9:
1.2 ! paf 10: static const char * const IDENT_SMTP_C="$Date: 2003/11/21 12:35:50 $";
1.1 paf 11:
12: #include "pa_exception.h"
13: #include "smtp.h"
14:
15: //#define DEBUG_SHOW
16:
17: SMTP::SMTP() {
18: the_socket = 0;
19: in_index = 0;
20: out_index = 0;
21: in_buffer = 0;
22: in_buffer_total = 0;
23: out_buffer_total = 0;
24:
25: in_buffer = (char *)malloc(SOCKET_BUFFER_SIZE);
26: out_buffer = (char *)malloc(SOCKET_BUFFER_SIZE);
27:
28: last_winsock_error = 0;
29: }
30:
31: SMTP::~SMTP() {
32: free(in_buffer);
33: free(out_buffer);
34: }
35:
36:
37: // ---------------------------------------------------------------------------
38: void SMTP::
39: ConnectToHost(const char* hostname, const char* service)
40: {
41: struct sockaddr_in sa_in;
42: u_short our_port;
43:
44: if( !ResolveService(service, &our_port) )
45: {
46: if( !ResolveHostname(hostname, &sa_in) )
47: {
48: sa_in.sin_family = AF_INET;
49: sa_in.sin_port = (unsigned short)our_port;
50:
51: if( !GetAndSetTheSocket(&the_socket) )
52: {
53: if( !GetConnection(the_socket, &sa_in) )
54: {
55: MiscSocketSetup(the_socket, &fds, &timeout);
56:
57: return;
58: }
59: }
60: }
61: }
62:
63: CloseConnect();
64:
65: throw Exception("smtp.connect",
66: 0,
67: "connect to %s:%s failed",
68: hostname, service);
69: }
70:
71: //---------------------------------------------------------------------------
72: // returns 0 if all is OK
73: int SMTP::
74: GetBuffer(int wait)
75: {
76: int retval;
77: int bytes_read = 0;
78:
79: // Use select to see if data is waiting...
80: FD_ZERO(&fds);
81: FD_SET(the_socket, &fds);
82:
83: // if wait is set, we are polling, return immediately
84: if( wait )
85: {
86: timeout.tv_sec = 0;
87: }
88: else
89: {
90: timeout.tv_sec = 30;
91: }
92:
93: if( SOCKET_ERROR == (retval = select(0, &fds, NULL, NULL, &timeout)) )
94: {
95: //char what_error[256];
96: int error_code = WSAGetLastError();
97:
98: if( error_code == WSAEINPROGRESS && wait )
99: {
100: return WAIT_A_BIT;
101: }
102:
103: /*
104: wsprintf(what_error,
105: "GetBuffer() unexpected error from select: %d",
106: error_code);
107:
108: ShowError(what_error);
109: */
110: }
111:
112: // if we don't want to wait
113: if( !retval && wait )
114: {
115: return WAIT_A_BIT;
116: }
117:
118: // we have data waiting...
119: bytes_read = recv(the_socket,
120: in_buffer,
121: SOCKET_BUFFER_SIZE,
122: 0);
123:
124: // just in case.
125: if( 0 == bytes_read )
126: {
127: // connection terminated (semi-) gracefully by the other side
128: return WSAENOTCONN;
129: }
130:
131: if( SOCKET_ERROR == bytes_read )
132: {
133: //char what_error[256];
134: int ws_error = WSAGetLastError();
135:
136: switch( ws_error )
137: {
138: // all these indicate loss of connection (are there more?)
139: case WSAENOTCONN:
140: case WSAENETDOWN:
141: case WSAENETUNREACH:
142: case WSAENETRESET:
143: case WSAECONNABORTED:
144: case WSAECONNRESET:
145: return WSAENOTCONN;
146:
147: case WSAEWOULDBLOCK:
148: return WAIT_A_BIT;
149:
150: default:
151: /*wsprintf(what_error,
152: "GetBuffer() unexpected error: %d",
153: ws_error);
154: ShowError(what_error);
155: */
156: break;
157: }
158: }
159:
160: // reset buffer indices.
161: in_buffer_total = bytes_read;
162: in_index = 0;
163:
164: return 0;
165: }
166:
167: //---------------------------------------------------------------------------
168: // returns 0 if all is OK
169: int SMTP::
170: GetChar(int wait, char *ch)
171: {
172: int retval = 0;
173:
174: if( in_index >= in_buffer_total )
175: {
176: if( 0 != (retval = GetBuffer(wait)) )
177: return retval;
178: }
179: *ch = in_buffer[in_index++];
180:
181: return 0;
182: }
183:
184: //----------------------------------------------------------------------
185: int SMTP::
186: get_line( void )
187: {
188: char ch = '.';
189: char in_data[MAXOUTLINE];
190: char *index;
191:
192: index = in_data;
193:
194: while( ch != '\n' )
195: {
196: if( 0 != GetChar(0, &ch) )
197: {
198: return -1;
199: }
200: else
201: {
202: *index = ch;
203: index++;
204: }
205: }
206:
207: if( in_data[3] == '-' )
208: return get_line();
209: else {
210: char *error_pos;
211: return strtol(in_data, &error_pos, 0);
212: }
213: }
214:
215: //---------------------------------------------------------------------------
216: // returns 0 if all is OK
217: void SMTP::
218: SendLine(const char* data, unsigned long length)
219: {
220: int num_sent;
221:
222: FD_ZERO(&fds);
223: FD_SET(the_socket, &fds);
224:
225: timeout.tv_sec = 30;
226:
227: while( length > 0 )
228: {
229: if( SOCKET_ERROR == select(0, NULL, &fds, NULL, &timeout) )
230: throw Exception("smtp.execute",
231: 0,
232: "connection::put_data() unexpected error from select: %d",
233: WSAGetLastError());
234:
235: num_sent = send(the_socket,
236: data,
237: length > 1024 ? 1024 : (int)length,
238: 0);
239:
240: if( SOCKET_ERROR == num_sent )
241: {
242: int ws_error = WSAGetLastError();
243:
244: switch( ws_error )
245: {
246: // this is the only error we really expect to see.
247: case WSAENOTCONN:
248: return;
249:
250: // seems that we can still get a block
251: case WSAEWOULDBLOCK:
252: break;
253:
254: default:
255: throw Exception("smtp.execute",
256: 0,
257: "connection::put_data() unexpected error from send(): %d",
258: ws_error);
259: }
260: }
261: else
262: {
263: length -= num_sent;
264: data += num_sent;
265: }
266: }
267: }
268:
269: //---------------------------------------------------------------------------
270: // returns 0 if all is OK
271: void SMTP::
272: SendBuffer(const char* data, unsigned long length)
273: {
274: while( length )
275: {
276: if( (out_index + length) < SOCKET_BUFFER_SIZE )
277: {
278: // we won't overflow, simply copy into the buffer
279: memcpy(out_buffer + out_index, data, length);
280: out_index += length;
281: length = 0;
282: }
283: else
284: {
285: unsigned int orphaned_chunk = SOCKET_BUFFER_SIZE - out_index;
286:
287: // we will overflow, handle it
288: memcpy(out_buffer + out_index, data, orphaned_chunk);
289:
290: // send this buffer...
291: SendLine(out_buffer, SOCKET_BUFFER_SIZE);
292:
293: length -= orphaned_chunk;
294: out_index = 0;
295: data += orphaned_chunk;
296: }
297: }
298: }
299:
300: //---------------------------------------------------------------------------
301: // returns 0 if all is OK
302: void SMTP::
303: FlushBuffer()
304: {
305: SendLine(out_buffer, out_index);
306: out_index = 0;
307: }
308:
309: //---------------------------------------------------------------------------
310: BOOL SMTP::
311: CloseConnect()
312: {
313: if( closesocket(the_socket) == SOCKET_ERROR )
314: return FALSE;
315:
316: return TRUE;
317: }
318:
319: //----------------------------------------------------------------------
320: void SMTP::
321: SendSmtpError(const char* message)
322: {
323: SendLine("QUIT\r\n", 6);
324: CloseConnect();
325:
326: throw Exception("smtp.execute",
327: 0,
328: "failed: %s", message);
329: }
330:
331: //----------------------------------------------------------------------
332: // returns 0 if all is OK
333: // returns 20, 21, 22, 23, 24, 25 if SendBuffer() fails
334: // returns 26 if FlushBuffer() fails
335: void SMTP::
336: transform_and_send_edit_data(const char* editptr )
337: {
338: const char *index;
339: char previous_char = 'x';
340: unsigned int send_len;
341: BOOL done = 0;
342:
343: send_len = lstrlen(editptr);
344: index = editptr;
345:
346: while( !done )
347: {
348: // room for extra char for double dot on end case
349: while( (unsigned int)(index - editptr) < send_len )
350: {
351: switch( *index )
352: {
353: case '.':
354: if( previous_char == '\n' )
355: SendBuffer(index, 1); // send _two_ dots...
356: SendBuffer(index, 1);
357: break;
358:
359: case '\n': // x\n -> \r\n
360: if( previous_char != '\r' ) {
361: SendBuffer("\r", 1);
362: SendBuffer(index, 1);
363: }
364: break;
365:
366: default:
367: SendBuffer(index, 1);
368: break;
369: }
370: previous_char = *index;
371: index++;
372: }
373:
374: if( (unsigned int)(index - editptr) == send_len )
375: done = 1;
376: }
377:
378: // this handles the case where the user doesn't end the last
379: // line with a <return>
380:
381: if( editptr[send_len-1] != '\n' )
382: SendBuffer("\r\n.\r\n", 5);
383: else
384: SendBuffer(".\r\n", 3);
385: /* now make sure it's all sent... */
386: FlushBuffer();
387: }
388:
389: //----------------------------------------------------------------------
390: // returns 0 if all is OK
391: // returns 16 if any get_line()'s fail
392: // returns 20, 21, 22, 23, 24, 25, 26 if transform_and_send_edit_data() fails
393: void SMTP::
394: send_data(const char* message)
395: {
396: transform_and_send_edit_data(message);
397: if( 250 != get_line() )
398: SendSmtpError("Message not accepted by server");
399: }
400:
401: //----------------------------------------------------------------------
402: // returns 0 if all is OK
403: // returns 50, 51, 52 if fails
404: void SMTP::
405: open_socket( const char* server, const char* service )
406: {
407: ConnectToHost(server, service);
408:
409: if( gethostname(my_hostname, sizeof(my_hostname)) )
410: throw Exception("smtp.connect",
411: 0,
412: "lookup of '%s' failed", my_hostname);
413: }
414:
415: //----------------------------------------------------------------------
416: // returns 0 if all is OK
417: // returns 50, 51, 52 if open_socket() fails
418: // returns 10, 11, 12, 13, 14, 15 if any get_line()'s fail
419: void SMTP::
420: prepare_message(char *from, char *to, const char* server, const char* service)
421: {
422: char out_data[MAXOUTLINE];
423: char *ptr;
424: int len;
425: int startLen;
426:
427: open_socket(server, service);
428:
429: if( 220 != get_line() )
430: SendSmtpError("SMTP server error");
431:
432: wsprintf(out_data, "HELO %s\r\n", my_hostname );
433: SendLine(out_data, lstrlen(out_data) );
434:
435: if( 250 != get_line() )
436: SendSmtpError("SMTP server error");
437:
438: wsprintf(out_data, "MAIL From: <%s>\r\n", from);
439: SendLine(out_data, lstrlen(out_data) );
440:
441: if( 250 != get_line() )
442: SendSmtpError("The mail server doesn't like the sender name, have you set your mail address correctly?");
443:
444: // do a series of RCPT lines for each name in address line
445: for( ptr = to; *ptr; ptr += len + 1 )
446: {
447: // if there's only one token left, then len will = startLen,
448: // and we'll iterate once only
449: startLen = lstrlen(ptr);
450: if( (len = strcspn(ptr, " ,\n\t\r")) != startLen )
451: {
452: ptr[len] = '\0'; // replace delim with NULL char
453: while( strchr (" ,\n\t\r", ptr[len+1]) ) // eat white space
454: ptr[len++] = '\0';
455: }
456:
457: wsprintf(out_data, "RCPT To: <%s>\r\n", ptr);
458: SendLine(out_data, lstrlen(out_data) );
459:
460: if( 250 != get_line() )
461: throw Exception("smtp.execute",
462: 0,
463: "The mail server doesn't like the name %s. Have you set the 'To: ' field correctly?",
464: ptr);
465:
466: if( len == startLen ) // last token, we're done
467: break;
468: }
469:
470: wsprintf(out_data, "DATA\r\n");
471: SendLine(out_data, lstrlen(out_data));
472:
473: if( 354 != get_line() )
474: SendSmtpError("Mail server error accepting message data");
475: }
476:
477:
478: static char *lsplit(char *string, char delim) {
479: if(string) {
480: char *v=strchr(string, delim);
481: if(v) {
482: *v=0;
483: return v+1;
484: }
485: }
486: return 0;
487: }
488: static char *rsplit(char *string, char delim) {
489: if(string) {
490: char *v=strrchr(string, delim);
491: if(v) {
492: *v=0;
493: return v+1;
494: }
495: }
496: return NULL;
497: }
498:
499: //----------------------------------------------------------------------------
500: //----------------------------------------------------------------------------
501: // returns 0 if all is OK
502: // returns 1 if MakeSmtpHeader() fails
503: // returns 10, 11, 12, 13, 14, 15, 50, 51, 52 if prepare_message() fails
504: void SMTP::
505: Send(const char* server, const char* service, const char* msg, char *from, char *to)
506: {
507: #ifdef DEBUG_SHOW
508: throw Exception("paf.debug",0,"from=%s|to=%s|msg=%s", from,to,msg);
509: #endif
510:
511: prepare_message( from, to, server, service);
512:
513: send_data(msg);
514:
515: SendLine("QUIT\r\n", 6 );
516: CloseConnect();
517: }