4 * POP3 service for the Citadel system
5 * Copyright (C) 1998-2001 by Art Cancro and others.
6 * This code is released under the terms of the GNU General Public License.
8 * Current status of standards conformance:
10 * -> All required POP3 commands described in RFC1939 are implemented.
12 * -> All optional POP3 commands described in RFC1939 are also implemented.
14 * -> The deprecated "LAST" command is included in this implementation, because
15 * there exist mail clients which insist on using it (such as Bynari
16 * TradeMail, and certain versions of Eudora).
28 #include <sys/types.h>
30 #if TIME_WITH_SYS_TIME
31 # include <sys/time.h>
35 # include <sys/time.h>
47 #include "sysdep_decls.h"
48 #include "citserver.h"
51 #include "serv_extensions.h"
58 #include "internet_addressing.h"
59 #include "serv_pop3.h"
63 #include "serv_crypto.h"
69 * This cleanup function blows away the temporary memory and files used by
72 void pop3_cleanup_function(void) {
74 /* Don't do this stuff if this is not a POP3 session! */
75 if (CC->h_command_function != pop3_command_loop) return;
77 lprintf(CTDL_DEBUG, "Performing POP3 cleanup hook\n");
78 if (POP3->msgs != NULL) free(POP3->msgs);
84 * Here's where our POP3 session begins its happy day.
86 void pop3_greeting(void) {
87 strcpy(CC->cs_clientname, "POP3 session");
89 CtdlAllocUserData(SYM_POP3, sizeof(struct citpop3));
93 cprintf("+OK Citadel POP3 server %s\r\n",
99 * Specify user name (implements POP3 "USER" command)
101 void pop3_user(char *argbuf) {
105 cprintf("-ERR You are already logged in.\r\n");
109 strcpy(username, argbuf);
112 lprintf(CTDL_DEBUG, "Trying <%s>\n", username);
113 if (CtdlLoginExistingUser(username) == login_ok) {
114 cprintf("+OK Password required for %s\r\n", username);
117 cprintf("-ERR No such user.\r\n");
124 * Back end for pop3_grab_mailbox()
126 void pop3_add_message(long msgnum, void *userdata) {
131 if (POP3->num_msgs < 2) POP3->msgs = malloc(sizeof(struct pop3msg));
132 else POP3->msgs = realloc(POP3->msgs,
133 (POP3->num_msgs * sizeof(struct pop3msg)) ) ;
134 POP3->msgs[POP3->num_msgs-1].msgnum = msgnum;
135 POP3->msgs[POP3->num_msgs-1].deleted = 0;
137 /* We need to know the length of this message when it is printed in
138 * RFC822 format. Perhaps we have cached this length in the message's
139 * metadata record. If so, great; if not, measure it and then cache
142 GetMetaData(&smi, POP3->num_msgs-1);
143 if (smi.meta_rfc822_length <= 0L) {
145 CtdlRedirectOutput(fp, -1);
146 CtdlOutputMsg(msgnum, MT_RFC822, HEADERS_ALL, 0, 1);
147 CtdlRedirectOutput(NULL, -1);
148 smi.meta_rfc822_length = ftell(fp);
152 POP3->msgs[POP3->num_msgs-1].rfc822_length = smi.meta_rfc822_length;
158 * Open the inbox and read its contents.
159 * (This should be called only once, by pop3_pass(), and returns the number
160 * of messages in the inbox, or -1 for error)
162 int pop3_grab_mailbox(void) {
166 if (getroom(&CC->room, MAILROOM) != 0) return(-1);
168 /* Load up the messages */
169 CtdlForEachMessage(MSGS_ALL, 0L, NULL, NULL,
170 pop3_add_message, NULL);
172 /* Figure out which are old and which are new */
173 CtdlGetRelationship(&vbuf, &CC->user, &CC->room);
174 POP3->lastseen = (-1);
175 if (POP3->num_msgs) for (i=0; i<POP3->num_msgs; ++i) {
176 if (is_msg_in_mset(vbuf.v_seen,
177 (POP3->msgs[POP3->num_msgs-1].msgnum) )) {
182 return(POP3->num_msgs);
185 void pop3_login(void)
189 msgs = pop3_grab_mailbox();
191 cprintf("+OK %s is logged in (%d messages)\r\n",
192 CC->user.fullname, msgs);
193 lprintf(CTDL_NOTICE, "POP3 authenticated %s\n", CC->user.fullname);
196 cprintf("-ERR Can't open your mailbox\r\n");
201 void pop3_apop(char *argbuf)
204 char userdigest[MD5_HEXSTRING_SIZE];
205 char realdigest[MD5_HEXSTRING_SIZE];
210 cprintf("-ERR You are already logged in; not in the AUTHORIZATION phase.\r\n");
214 if ((sptr = strchr(argbuf, ' ')) == NULL)
216 cprintf("-ERR Invalid APOP line.\r\n");
222 while ((*sptr) && isspace(*sptr))
225 strncpy(username, argbuf, sizeof(username)-1);
226 username[sizeof(username)-1] = '\0';
228 memset(userdigest, MD5_HEXSTRING_SIZE, 0);
229 strncpy(userdigest, sptr, MD5_HEXSTRING_SIZE-1);
231 if (CtdlLoginExistingUser(username) != login_ok)
233 cprintf("-ERR No such user.\r\n");
237 if (getuser(&CC->user, CC->curr_user))
239 cprintf("-ERR No such user.\r\n");
243 make_apop_string(CC->user.password, CC->cs_nonce, realdigest, sizeof realdigest);
244 if (!strncasecmp(realdigest, userdigest, MD5_HEXSTRING_SIZE-1))
251 cprintf("-ERR That is NOT the password.\r\n");
257 * Authorize with password (implements POP3 "PASS" command)
259 void pop3_pass(char *argbuf) {
262 strcpy(password, argbuf);
265 lprintf(CTDL_DEBUG, "Trying <%s>\n", password);
266 if (CtdlTryPassword(password) == pass_ok) {
270 cprintf("-ERR That is NOT the password.\r\n");
277 * list available msgs
279 void pop3_list(char *argbuf) {
283 which_one = atoi(argbuf);
285 /* "list one" mode */
287 if (which_one > POP3->num_msgs) {
288 cprintf("-ERR no such message, only %d are here\r\n",
292 else if (POP3->msgs[which_one-1].deleted) {
293 cprintf("-ERR Sorry, you deleted that message.\r\n");
297 cprintf("+OK %d %ld\r\n",
299 (long)POP3->msgs[which_one-1].rfc822_length
305 /* "list all" (scan listing) mode */
307 cprintf("+OK Here's your mail:\r\n");
308 if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
309 if (! POP3->msgs[i].deleted) {
310 cprintf("%d %ld\r\n",
312 (long)POP3->msgs[i].rfc822_length);
321 * STAT (tally up the total message count and byte count) command
323 void pop3_stat(char *argbuf) {
325 size_t total_octets = 0;
328 if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
329 if (! POP3->msgs[i].deleted) {
331 total_octets += POP3->msgs[i].rfc822_length;
335 cprintf("+OK %d %ld\r\n", total_msgs, (long)total_octets);
341 * RETR command (fetch a message)
343 void pop3_retr(char *argbuf) {
346 which_one = atoi(argbuf);
347 if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
348 cprintf("-ERR No such message.\r\n");
352 if (POP3->msgs[which_one - 1].deleted) {
353 cprintf("-ERR Sorry, you deleted that message.\r\n");
357 cprintf("+OK Message %d:\r\n", which_one);
358 CtdlOutputMsg(POP3->msgs[which_one - 1].msgnum, MT_RFC822, HEADERS_ALL, 0, 1);
364 * TOP command (dumb way of fetching a partial message or headers-only)
366 void pop3_top(char *argbuf) {
368 int lines_requested = 0;
369 int lines_dumped = 0;
376 sscanf(argbuf, "%d %d", &which_one, &lines_requested);
377 if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
378 cprintf("-ERR No such message.\r\n");
382 if (POP3->msgs[which_one - 1].deleted) {
383 cprintf("-ERR Sorry, you deleted that message.\r\n");
389 cprintf("-ERR Internal error: could not create temp file\r\n");
392 CtdlRedirectOutput(fp, -1);
393 CtdlOutputMsg(POP3->msgs[which_one - 1].msgnum, MT_RFC822, HEADERS_ALL, 0, 1);
394 CtdlRedirectOutput(NULL, -1);
396 cprintf("+OK Message %d:\r\n", which_one);
398 while (ptr = fgets(buf, sizeof buf, fp),
399 ( (ptr!=NULL) && (done == 0))) {
401 if (lines_dumped >= lines_requested) done = 1;
402 if ((in_body == 0) || (done == 0))
403 client_write(buf, strlen(buf));
404 if (in_body) ++lines_dumped;
405 if ((buf[0]==13)||(buf[0]==10)) in_body = 1;
407 if (buf[strlen(buf)-1] != 10) cprintf("\n");
414 * DELE (delete message from mailbox)
416 void pop3_dele(char *argbuf) {
419 which_one = atoi(argbuf);
420 if ( (which_one < 1) || (which_one > POP3->num_msgs) ) {
421 cprintf("-ERR No such message.\r\n");
425 if (POP3->msgs[which_one - 1].deleted) {
426 cprintf("-ERR You already deleted that message.\r\n");
430 /* Flag the message as deleted. Will expunge during QUIT command. */
431 POP3->msgs[which_one - 1].deleted = 1;
432 cprintf("+OK Message %d deleted.\r\n",
437 /* Perform "UPDATE state" stuff
439 void pop3_update(void) {
443 /* Remove messages marked for deletion */
444 if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
445 if (POP3->msgs[i].deleted) {
446 CtdlDeleteMessages(MAILROOM,
447 POP3->msgs[i].msgnum, "");
451 /* Set last read pointer */
452 if (POP3->num_msgs > 0) {
453 lgetuser(&CC->user, CC->curr_user);
455 CtdlGetRelationship(&vbuf, &CC->user, &CC->room);
456 snprintf(vbuf.v_seen, sizeof vbuf.v_seen, "*:%ld",
457 POP3->msgs[POP3->num_msgs-1].msgnum);
458 CtdlSetRelationship(&vbuf, &CC->user, &CC->room);
467 * RSET (reset, i.e. undelete any deleted messages) command
469 void pop3_rset(char *argbuf) {
472 if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
473 if (POP3->msgs[i].deleted) {
474 POP3->msgs[i].deleted = 0;
477 cprintf("+OK Reset completed.\r\n");
483 * LAST (Determine which message is the last unread message)
485 void pop3_last(char *argbuf) {
486 cprintf("+OK %d\r\n", POP3->lastseen + 1);
492 * UIDL (Universal IDentifier Listing) is easy. Our 'unique' message
493 * identifiers are simply the Citadel message numbers in the database.
495 void pop3_uidl(char *argbuf) {
499 which_one = atoi(argbuf);
501 /* "list one" mode */
503 if (which_one > POP3->num_msgs) {
504 cprintf("-ERR no such message, only %d are here\r\n",
508 else if (POP3->msgs[which_one-1].deleted) {
509 cprintf("-ERR Sorry, you deleted that message.\r\n");
513 cprintf("+OK %d %ld\r\n",
515 POP3->msgs[which_one-1].msgnum
521 /* "list all" (scan listing) mode */
523 cprintf("+OK Here's your mail:\r\n");
524 if (POP3->num_msgs > 0) for (i=0; i<POP3->num_msgs; ++i) {
525 if (! POP3->msgs[i].deleted) {
526 cprintf("%d %ld\r\n",
528 POP3->msgs[i].msgnum);
537 * implements the STLS command (Citadel API version)
542 char ok_response[SIZ];
543 char nosup_response[SIZ];
544 char error_response[SIZ];
547 "+OK Begin TLS negotiation now\r\n");
548 sprintf(nosup_response,
549 "-ERR TLS not supported here\r\n");
550 sprintf(error_response,
551 "-ERR Internal error\r\n");
552 CtdlStartTLS(ok_response, nosup_response, error_response);
563 * Main command loop for POP3 sessions.
565 void pop3_command_loop(void) {
569 memset(cmdbuf, 0, sizeof cmdbuf); /* Clear it, just in case */
570 if (client_getln(cmdbuf, sizeof cmdbuf) < 1) {
571 lprintf(CTDL_ERR, "POP3 socket is broken. Ending session.\r\n");
575 lprintf(CTDL_INFO, "POP3: %s\r\n", cmdbuf);
576 while (strlen(cmdbuf) < 5) strcat(cmdbuf, " ");
578 if (!strncasecmp(cmdbuf, "NOOP", 4)) {
579 cprintf("+OK No operation.\r\n");
582 else if (!strncasecmp(cmdbuf, "QUIT", 4)) {
583 cprintf("+OK Goodbye...\r\n");
589 else if (!strncasecmp(cmdbuf, "USER", 4)) {
590 pop3_user(&cmdbuf[5]);
593 else if (!strncasecmp(cmdbuf, "PASS", 4)) {
594 pop3_pass(&cmdbuf[5]);
597 else if (!strncasecmp(cmdbuf, "APOP", 4))
599 pop3_apop(&cmdbuf[5]);
603 else if (!strncasecmp(cmdbuf, "STLS", 4)) {
608 else if (!CC->logged_in) {
609 cprintf("-ERR Not logged in.\r\n");
612 else if (!strncasecmp(cmdbuf, "LIST", 4)) {
613 pop3_list(&cmdbuf[5]);
616 else if (!strncasecmp(cmdbuf, "STAT", 4)) {
617 pop3_stat(&cmdbuf[5]);
620 else if (!strncasecmp(cmdbuf, "RETR", 4)) {
621 pop3_retr(&cmdbuf[5]);
624 else if (!strncasecmp(cmdbuf, "DELE", 4)) {
625 pop3_dele(&cmdbuf[5]);
628 else if (!strncasecmp(cmdbuf, "RSET", 4)) {
629 pop3_rset(&cmdbuf[5]);
632 else if (!strncasecmp(cmdbuf, "UIDL", 4)) {
633 pop3_uidl(&cmdbuf[5]);
636 else if (!strncasecmp(cmdbuf, "TOP", 3)) {
637 pop3_top(&cmdbuf[4]);
640 else if (!strncasecmp(cmdbuf, "LAST", 4)) {
641 pop3_last(&cmdbuf[4]);
645 cprintf("-ERR I'm afraid I can't do that.\r\n");
652 char *serv_pop3_init(void)
654 CtdlRegisterServiceHook(config.c_pop3_port,
659 CtdlRegisterSessionHook(pop3_cleanup_function, EVT_STOP);