2 * pop3.c -- POP3 protocol methods
4 * For license terms, see the file COPYING in this directory.
12 #if defined(HAVE_UNISTD_H)
15 #if defined(STDC_HEADERS)
19 #include "fetchmail.h"
24 #endif /* HAVE_LIBOPIE */
26 #ifndef strstr /* glibc-2.1 declares this as a macro */
27 extern char *strstr(); /* needed on sysV68 R3V7.1. */
33 static char lastok[POPBUFSIZE+1];
34 #endif /* HAVE_LIBOPIE */
36 int pop3_ok (int sock, char *argbuf)
37 /* parse command response */
40 char buf [POPBUFSIZE+1];
43 if ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
46 if (*bufp == '+' || *bufp == '-')
51 while (isalpha(*bufp))
57 if (strcmp(buf,"+OK") == 0)
61 #endif /* HAVE_LIBOPIE */
64 else if (strcmp(buf,"-ERR") == 0)
67 * We're checking for "lock busy", "unable to lock",
68 * "already locked" etc. here. This indicates that we
69 * have to wait for the server to clean up before we
72 * PS_LOCKBUSY check empirically verified with two recent
73 * versions the Berkeley popper; QPOP (version 2.2) and
74 * QUALCOMM Pop server derived from UCB (version 2.1.4-R3)
76 if (strstr(bufp,"lock")||strstr(bufp,"Lock")||strstr(bufp,"LOCK"))
93 int pop3_getauth(int sock, struct query *ctl, char *greeting)
94 /* apply for connection authorization */
101 #endif /* HAVE_LIBOPIE */
103 switch (ctl->server.protocol) {
105 ok = gen_transact(sock, "USER %s", ctl->remotename);
109 /* if CompuServe rejected our userid, try RPA */
110 if (strstr(greeting, "csi.com"))
112 /* AUTH command should return a list of available mechanisms */
113 if (gen_transact(sock, "AUTH") == 0)
116 flag has_rpa = FALSE;
117 flag authenticated = FALSE;
119 while ((ok = gen_recv(sock, buffer, sizeof(buffer))) == 0)
122 if (buffer[0] == '.')
124 if (strncasecmp(buffer, "rpa", 3) == 0)
128 if (POP3_auth_rpa(ctl->remotename,
129 ctl->password, sock) == PS_SUCCESS)
131 authenticated = TRUE;
136 /* we could return(PS_SUCCESS) here */
142 else /* not a CompuServe host, fail in the ordinary way */
143 #endif /* RPA_ENABLE */
146 #if defined(HAVE_LIBOPIE) && defined(OPIE_ENABLE)
147 /* see RFC1938: A One-Time Password System */
148 if (challenge = strstr(lastok, "otp-"))
150 char response[OPIE_RESPONSE_MAX+1];
152 if (opiegenerator(challenge, ctl->password, response))
158 ok = gen_transact(sock, "PASS %s", response);
161 #endif /* defined(HAVE_LIBOPIE) && defined(OPIE_ENABLE) */
163 /* ordinary validation, no one-time password or RPA */
164 ok = gen_transact(sock, "PASS %s", ctl->password);
168 /* build MD5 digest from greeting timestamp + password */
169 /* find start of timestamp */
170 for (start = greeting; *start != 0 && *start != '<'; start++)
173 error(0, -1, "Required APOP timestamp not found in greeting");
177 /* find end of timestamp */
178 for (end = start; *end != 0 && *end != '>'; end++)
180 if (*end == 0 || end == start + 1) {
181 error(0, -1, "Timestamp syntax error in greeting");
187 /* copy timestamp and password into digestion buffer */
188 msg = (char *)xmalloc((end-start+1) + strlen(ctl->password) + 1);
190 strcat(msg,ctl->password);
192 strcpy(ctl->digest, MD5Digest(msg));
195 ok = gen_transact(sock, "APOP %s %s", ctl->remotename, ctl->digest);
199 if ((ok = gen_transact(sock,"USER %s", ctl->remotename)) == 0)
200 ok = gen_transact(sock, "RPOP %s", ctl->password);
204 error(0, 0, "Undefined protocol request in POP3_auth");
208 /* maybe we detected a lock-busy condition? */
211 if (ok == PS_LOCKBUSY)
213 error(0, 0, "lock busy! Is another session active?");
219 * Empirical experience shows some server/OS combinations
220 * may need a brief pause even after any lockfiles on the
221 * server are released, to give the server time to finish
222 * copying back very large mailfolders from the temp-file...
223 * this is only ever an issue with extremely large mailboxes.
225 sleep(3); /* to be _really_ safe, probably need sleep(5)! */
232 pop3_gettopid( int sock, int num , char *id)
236 char buf [POPBUFSIZE+1];
237 sprintf( buf, "TOP %d 1", num );
238 if( (ok = gen_transact(sock, buf ) ) != 0 )
241 while((ok = gen_recv(sock, buf, sizeof(buf))) == 0) {
244 if( ! got_it && ! strncasecmp("Message-Id:", buf, 11 )) {
246 sscanf( buf+12, "%s", id);
253 pop3_slowuidl( int sock, struct query *ctl, int *countp, int *newp)
255 /* This approach tries to get the message headers from the
256 * remote hosts and compares the message-id to the already known
258 * + if the first message containes a new id, all messages on
259 * the server will be new
260 * + if the first is known, try to estimate the last known message
261 * on the server and check. If this works you know the total number
262 * of messages to get.
263 * + Otherwise run a binary search to determine the last known message
265 int ok, nolinear = 0;
266 int first_nr, list_len, try_id, try_nr, add_id;
270 if( (ok = pop3_gettopid( sock, 1, id )) != 0 )
273 if( ( first_nr = str_nr_in_list(&ctl->oldsaved, id) ) == -1 ) {
274 /* the first message is unknown -> all messages are new */
279 /* check where we expect the latest known message */
280 list_len = count_list( &ctl->oldsaved );
281 try_id = list_len - first_nr; /* -1 + 1 */
283 if( try_id <= *countp ) {
284 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
287 try_nr = str_nr_in_list(&ctl->oldsaved, id);
292 if( try_nr != list_len -1 ) {
293 /* some messages inbetween have been deleted... */
297 for( add_id = 1<<30; add_id > try_id-1; add_id >>= 1 )
299 for( ; add_id; add_id >>= 1 ) {
301 if( try_id - add_id <= 1 ) {
308 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
310 try_nr = str_nr_in_list(&ctl->oldsaved, id);
316 error(0,0,"Messages inserted into list on server. "
317 "Cannot handle this.");
322 /* The first try_id messages are known -> copy them to
324 for( num = first_nr; num < list_len; num++ )
325 save_str(&ctl->newsaved, num-first_nr + 1,
326 str_from_nr_list( &ctl->oldsaved, num ));
329 free_str_list(&ctl->oldsaved);
334 *newp = *countp - try_id;
338 static int pop3_getrange(int sock,
341 int *countp, int *newp)
342 /* get range of messages to be fetched */
345 char buf [POPBUFSIZE+1];
347 /* Ensure that the new list is properly empty */
348 ctl->newsaved = (struct idlist *)NULL;
351 /* Alain Knaff suggests this, but it's not RFC standard */
353 if ((ok = gen_transact(sock, "MBOX %s", folder)))
357 /* get the total message count */
358 gen_send(sock, "STAT");
359 ok = pop3_ok(sock, buf);
361 sscanf(buf,"%d %*d", countp);
366 * Newer, RFC-1725-conformant POP servers may not have the LAST command.
367 * We work as hard as possible to hide this ugliness, but it makes
368 * counting new messages intrinsically quadratic in the worst case.
372 if (*countp > 0 && !ctl->fetchall)
376 if (!ctl->server.uidl) {
377 gen_send(sock, "LAST");
378 ok = pop3_ok(sock, buf);
383 if (sscanf(buf, "%d", &last) == 0)
385 error(0, 0, "protocol error");
388 *newp = (*countp - last);
392 /* grab the mailbox's UID list */
393 if ((ok = gen_transact(sock, "UIDL")) != 0)
395 /* don't worry, yet! do it the slow way */
396 if((ok = pop3_slowuidl( sock, ctl, countp, newp))!=0)
398 error(0, 0, "protocol error while fetching UIDLs");
407 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
411 else if (sscanf(buf, "%d %s", &num, id) == 2)
413 save_str(&ctl->newsaved, num, id);
415 /* note: ID comparison is caseblind */
416 if (!str_in_list(&ctl->oldsaved, id))
427 static int pop3_getsizes(int sock, int count, int *sizes)
428 /* capture the sizes of all messages */
432 if ((ok = gen_transact(sock, "LIST")) != 0)
436 char buf [POPBUFSIZE+1];
438 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
444 else if (sscanf(buf, "%d %d", &num, &size) == 2)
445 sizes[num - 1] = size;
452 static int pop3_is_old(int sock, struct query *ctl, int num)
453 /* is the given message old? */
456 return (num <= last);
458 /* note: ID comparison is caseblind */
459 return (str_in_list(&ctl->oldsaved,
460 str_find (&ctl->newsaved, num)));
463 static int pop3_fetch(int sock, struct query *ctl, int number, int *lenp)
464 /* request nth message */
467 char buf [POPBUFSIZE+1];
469 gen_send(sock, "RETR %d", number);
470 if ((ok = pop3_ok(sock, buf)) != 0)
473 *lenp = -1; /* we got sizes from the LIST response */
478 static int pop3_delete(int sock, struct query *ctl, int number)
479 /* delete a given message */
481 /* actually, mark for deletion -- doesn't happen until QUIT time */
482 return(gen_transact(sock, "DELE %d", number));
485 static int pop3_logout(int sock, struct query *ctl)
486 /* send logout command */
488 int ok = gen_transact(sock, "QUIT");
496 const static struct method pop3 =
498 "POP3", /* Post Office Protocol v3 */
499 110, /* standard POP3 port */
500 FALSE, /* this is not a tagged protocol */
501 TRUE, /* this uses a message delimiter */
502 pop3_ok, /* parse command response */
503 pop3_getauth, /* get authorization */
504 pop3_getrange, /* query range of messages */
505 pop3_getsizes, /* we can get a list of sizes */
506 pop3_is_old, /* how do we tell a message is old? */
507 pop3_fetch, /* request given message */
508 NULL, /* no way to fetch body alone */
509 NULL, /* no message trailer */
510 pop3_delete, /* how to delete a message */
511 pop3_logout, /* log out, we're done */
512 FALSE, /* no, we can't re-poll */
515 int doPOP3 (struct query *ctl)
516 /* retrieve messages using POP3 */
519 if (ctl->mailboxes->id) {
520 fprintf(stderr,"Option --remote is not supported with POP3\n");
524 peek_capable = FALSE;
525 return(do_protocol(ctl, &pop3));
527 #endif /* POP3_ENABLE */
529 /* pop3.c ends here */