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 * CompuServe has changed its RPA behavior. Used to be they didn't
110 * accept USER, but I'm told this changed in mid-November.
112 if (strstr(greeting, "csi.com"))
114 /* AUTH command should return a list of available mechanisms */
115 if (gen_transact(sock, "AUTH") == 0)
118 flag has_rpa = FALSE;
120 while ((ok = gen_recv(sock, buffer, sizeof(buffer))) == 0)
122 if (buffer[0] == '.')
124 if (strncasecmp(buffer, "rpa", 3) == 0)
127 if (has_rpa && !POP3_auth_rpa(ctl->remotename,
128 ctl->password, sock))
132 #endif /* RPA_ENABLE */
134 #if defined(HAVE_LIBOPIE) && defined(OPIE_ENABLE)
135 /* see RFC1938: A One-Time Password System */
136 if (challenge = strstr(lastok, "otp-"))
138 char response[OPIE_RESPONSE_MAX+1];
140 if (opiegenerator(challenge, ctl->password, response))
146 ok = gen_transact(sock, "PASS %s", response);
149 #endif /* defined(HAVE_LIBOPIE) && defined(OPIE_ENABLE) */
151 /* ordinary validation, no one-time password or RPA */
152 ok = gen_transact(sock, "PASS %s", ctl->password);
156 /* build MD5 digest from greeting timestamp + password */
157 /* find start of timestamp */
158 for (start = greeting; *start != 0 && *start != '<'; start++)
161 error(0, -1, "Required APOP timestamp not found in greeting");
165 /* find end of timestamp */
166 for (end = start; *end != 0 && *end != '>'; end++)
168 if (*end == 0 || end == start + 1) {
169 error(0, -1, "Timestamp syntax error in greeting");
175 /* copy timestamp and password into digestion buffer */
176 msg = (char *)xmalloc((end-start+1) + strlen(ctl->password) + 1);
178 strcat(msg,ctl->password);
180 strcpy(ctl->digest, MD5Digest(msg));
183 ok = gen_transact(sock, "APOP %s %s", ctl->remotename, ctl->digest);
187 if ((ok = gen_transact(sock,"USER %s", ctl->remotename)) == 0)
188 ok = gen_transact(sock, "RPOP %s", ctl->password);
192 error(0, 0, "Undefined protocol request in POP3_auth");
196 /* maybe we detected a lock-busy condition? */
199 if (ok == PS_LOCKBUSY)
201 error(0, 0, "lock busy! Is another session active?");
207 * Empirical experience shows some server/OS combinations
208 * may need a brief pause even after any lockfiles on the
209 * server are released, to give the server time to finish
210 * copying back very large mailfolders from the temp-file...
211 * this is only ever an issue with extremely large mailboxes.
213 sleep(3); /* to be _really_ safe, probably need sleep(5)! */
220 pop3_gettopid( int sock, int num , char *id)
224 char buf [POPBUFSIZE+1];
225 sprintf( buf, "TOP %d 1", num );
226 if( (ok = gen_transact(sock, buf ) ) != 0 )
229 while((ok = gen_recv(sock, buf, sizeof(buf))) == 0) {
232 if( ! got_it && ! strncasecmp("Message-Id:", buf, 11 )) {
234 /* prevent stack overflows */
236 sscanf( buf+12, "%s", id);
243 pop3_slowuidl( int sock, struct query *ctl, int *countp, int *newp)
245 /* This approach tries to get the message headers from the
246 * remote hosts and compares the message-id to the already known
248 * + if the first message containes a new id, all messages on
249 * the server will be new
250 * + if the first is known, try to estimate the last known message
251 * on the server and check. If this works you know the total number
252 * of messages to get.
253 * + Otherwise run a binary search to determine the last known message
255 int ok, nolinear = 0;
256 int first_nr, list_len, try_id, try_nr, add_id;
260 if( (ok = pop3_gettopid( sock, 1, id )) != 0 )
263 if( ( first_nr = str_nr_in_list(&ctl->oldsaved, id) ) == -1 ) {
264 /* the first message is unknown -> all messages are new */
269 /* check where we expect the latest known message */
270 list_len = count_list( &ctl->oldsaved );
271 try_id = list_len - first_nr; /* -1 + 1 */
273 if( try_id <= *countp ) {
274 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
277 try_nr = str_nr_last_in_list(&ctl->oldsaved, id);
282 if( try_nr != list_len -1 ) {
283 /* some messages inbetween have been deleted... */
287 for( add_id = 1<<30; add_id > try_id-1; add_id >>= 1 )
289 for( ; add_id; add_id >>= 1 ) {
291 if( try_id - add_id <= 1 ) {
298 if( (ok = pop3_gettopid( sock, try_id, id )) != 0 )
300 try_nr = str_nr_in_list(&ctl->oldsaved, id);
306 error(0,0,"Messages inserted into list on server. "
307 "Cannot handle this.");
312 /* The first try_id messages are known -> copy them to
314 for( num = first_nr; num < list_len; num++ )
315 save_str(&ctl->newsaved, num-first_nr + 1,
316 str_from_nr_list( &ctl->oldsaved, num ));
319 free_str_list(&ctl->oldsaved);
324 *newp = *countp - try_id;
328 static int pop3_getrange(int sock,
331 int *countp, int *newp)
332 /* get range of messages to be fetched */
335 char buf [POPBUFSIZE+1];
337 /* Ensure that the new list is properly empty */
338 ctl->newsaved = (struct idlist *)NULL;
341 /* Alain Knaff suggests this, but it's not RFC standard */
343 if ((ok = gen_transact(sock, "MBOX %s", folder)))
347 /* get the total message count */
348 gen_send(sock, "STAT");
349 ok = pop3_ok(sock, buf);
351 sscanf(buf,"%d %*d", countp);
356 * Newer, RFC-1725-conformant POP servers may not have the LAST command.
357 * We work as hard as possible to hide this ugliness, but it makes
358 * counting new messages intrinsically quadratic in the worst case.
362 if (*countp > 0 && !ctl->fetchall)
366 if (!ctl->server.uidl) {
367 gen_send(sock, "LAST");
368 ok = pop3_ok(sock, buf);
373 if (sscanf(buf, "%d", &last) == 0)
375 error(0, 0, "protocol error");
378 *newp = (*countp - last);
382 /* grab the mailbox's UID list */
383 if ((ok = gen_transact(sock, "UIDL")) != 0)
385 /* don't worry, yet! do it the slow way */
386 if((ok = pop3_slowuidl( sock, ctl, countp, newp))!=0)
388 error(0, 0, "protocol error while fetching UIDLs");
397 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
401 else if (sscanf(buf, "%d %s", &num, id) == 2)
403 save_str(&ctl->newsaved, num, id);
405 /* note: ID comparison is caseblind */
406 if (!str_in_list(&ctl->oldsaved, id))
417 static int pop3_getsizes(int sock, int count, int *sizes)
418 /* capture the sizes of all messages */
422 if ((ok = gen_transact(sock, "LIST")) != 0)
426 char buf [POPBUFSIZE+1];
428 while ((ok = gen_recv(sock, buf, sizeof(buf))) == 0)
434 else if (sscanf(buf, "%d %d", &num, &size) == 2)
435 sizes[num - 1] = size;
442 static int pop3_is_old(int sock, struct query *ctl, int num)
443 /* is the given message old? */
446 return (num <= last);
448 /* note: ID comparison is caseblind */
449 return (str_in_list(&ctl->oldsaved,
450 str_find (&ctl->newsaved, num)));
453 static int pop3_fetch(int sock, struct query *ctl, int number, int *lenp)
454 /* request nth message */
457 char buf [POPBUFSIZE+1];
459 gen_send(sock, "RETR %d", number);
460 if ((ok = pop3_ok(sock, buf)) != 0)
463 *lenp = -1; /* we got sizes from the LIST response */
468 static int pop3_delete(int sock, struct query *ctl, int number)
469 /* delete a given message */
471 /* actually, mark for deletion -- doesn't happen until QUIT time */
472 return(gen_transact(sock, "DELE %d", number));
475 static int pop3_logout(int sock, struct query *ctl)
476 /* send logout command */
478 int ok = gen_transact(sock, "QUIT");
486 const static struct method pop3 =
488 "POP3", /* Post Office Protocol v3 */
489 110, /* standard POP3 port */
490 FALSE, /* this is not a tagged protocol */
491 TRUE, /* this uses a message delimiter */
492 pop3_ok, /* parse command response */
493 pop3_getauth, /* get authorization */
494 pop3_getrange, /* query range of messages */
495 pop3_getsizes, /* we can get a list of sizes */
496 pop3_is_old, /* how do we tell a message is old? */
497 pop3_fetch, /* request given message */
498 NULL, /* no way to fetch body alone */
499 NULL, /* no message trailer */
500 pop3_delete, /* how to delete a message */
501 pop3_logout, /* log out, we're done */
502 FALSE, /* no, we can't re-poll */
505 int doPOP3 (struct query *ctl)
506 /* retrieve messages using POP3 */
509 if (ctl->mailboxes->id) {
510 fprintf(stderr,"Option --remote is not supported with POP3\n");
514 peek_capable = FALSE;
515 return(do_protocol(ctl, &pop3));
517 #endif /* POP3_ENABLE */
519 /* pop3.c ends here */