2 * Copyright notice from original mutt:
3 * Copyright (C) 1996-8 Michael R. Elkins <me@mutt.org>
4 * Copyright (C) 1996-9 Brandon Long <blong@fiction.net>
5 * Copyright (C) 1999-2002 Brendan Cully <brendan@kublai.com>
7 * This file is part of mutt-ng, see http://www.muttng.org/.
8 * It's licensed under the GNU General Public License,
9 * please see the file GPL in the top level source directory.
12 /* command.c: routines for sending commands to an IMAP server and parsing
20 #include "imap_private.h"
26 #include "lib/debug.h"
31 #define IMAP_CMD_BUFSIZE 512
33 /* forward declarations */
34 static void cmd_handle_fatal (IMAP_DATA * idata);
35 static int cmd_handle_untagged (IMAP_DATA * idata);
36 static void cmd_make_sequence (IMAP_DATA * idata);
37 static void cmd_parse_capabilities (IMAP_DATA * idata, char *s);
38 static void cmd_parse_expunge (IMAP_DATA * idata, const char *s);
39 static void cmd_parse_fetch (IMAP_DATA * idata, char *s);
40 static void cmd_parse_myrights (IMAP_DATA * idata, char *s);
42 static char *Capabilities[] = {
57 /* imap_cmd_start: Given an IMAP command, send it to the server.
58 * Currently a minor convenience, but helps to route all IMAP commands
59 * through a single interface. */
60 int imap_cmd_start (IMAP_DATA * idata, const char *cmd)
66 if (idata->status == IMAP_FATAL) {
67 cmd_handle_fatal (idata);
71 cmd_make_sequence (idata);
72 /* seq, space, cmd, \r\n\0 */
73 outlen = safe_strlen (idata->cmd.seq) + safe_strlen (cmd) + 4;
74 out = (char *) safe_malloc (outlen);
75 snprintf (out, outlen, "%s %s\r\n", idata->cmd.seq, cmd);
77 rc = mutt_socket_write (idata->conn, out);
81 return (rc < 0) ? IMAP_CMD_BAD : 0;
84 /* imap_cmd_step: Reads server responses from an IMAP command, detects
85 * tagged completion response, handles untagged messages, can read
86 * arbitrarily large strings (using malloc, so don't make it _too_
88 int imap_cmd_step (IMAP_DATA * idata)
90 IMAP_COMMAND *cmd = &idata->cmd;
94 if (idata->status == IMAP_FATAL) {
95 cmd_handle_fatal (idata);
99 /* read into buffer, expanding buffer as necessary until we have a full
102 if (len == cmd->blen) {
103 safe_realloc (&cmd->buf, cmd->blen + IMAP_CMD_BUFSIZE);
104 cmd->blen = cmd->blen + IMAP_CMD_BUFSIZE;
105 debug_print (3, ("grew buffer to %u bytes\n", cmd->blen));
108 c = mutt_socket_readln (cmd->buf + len, cmd->blen - len, idata->conn);
110 debug_print (1, ("Error reading server response.\n"));
111 /* cmd_handle_fatal (idata); */
117 /* if we've read all the way to the end of the buffer, we haven't read a
118 * full line (mutt_socket_readln strips the \r, so we always have at least
119 * one character free when we've read a full line) */
120 while (len == cmd->blen);
122 /* don't let one large string make cmd->buf hog memory forever */
123 if ((cmd->blen > IMAP_CMD_BUFSIZE) && (len <= IMAP_CMD_BUFSIZE)) {
124 safe_realloc (&cmd->buf, IMAP_CMD_BUFSIZE);
125 cmd->blen = IMAP_CMD_BUFSIZE;
126 debug_print (3, ("shrank buffer to %u bytes\n", cmd->blen));
129 idata->lastread = time (NULL);
131 /* handle untagged messages. The caller still gets its shot afterwards. */
132 if (!ascii_strncmp (cmd->buf, "* ", 2) && cmd_handle_untagged (idata))
135 /* server demands a continuation response from us */
136 if (!ascii_strncmp (cmd->buf, "+ ", 2)) {
137 return IMAP_CMD_RESPOND;
140 /* tagged completion code */
141 if (!ascii_strncmp (cmd->buf, cmd->seq, SEQLEN)) {
142 imap_cmd_finish (idata);
143 return imap_code (cmd->buf) ? IMAP_CMD_OK : IMAP_CMD_NO;
146 return IMAP_CMD_CONTINUE;
149 /* imap_code: returns 1 if the command result was OK, or 0 if NO or BAD */
150 int imap_code (const char *s)
154 return (ascii_strncasecmp ("OK", s, 2) == 0);
157 /* imap_exec: execute a command, and wait for the response from the server.
158 * Also, handle untagged responses.
160 * IMAP_CMD_FAIL_OK: the calling procedure can handle failure. This is used
161 * for checking for a mailbox on append and login
162 * IMAP_CMD_PASS: command contains a password. Suppress logging.
163 * Return 0 on success, -1 on Failure, -2 on OK Failure
165 int imap_exec (IMAP_DATA * idata, const char *cmd, int flags)
171 if (idata->status == IMAP_FATAL) {
172 cmd_handle_fatal (idata);
176 /* create sequence for command */
177 cmd_make_sequence (idata);
178 /* seq, space, cmd, \r\n\0 */
179 outlen = safe_strlen (idata->cmd.seq) + safe_strlen (cmd) + 4;
180 out = (char *) safe_malloc (outlen);
181 snprintf (out, outlen, "%s %s\r\n", idata->cmd.seq, cmd);
183 rc = mutt_socket_write_d (idata->conn, out,
184 flags & IMAP_CMD_PASS ? IMAP_LOG_PASS :
189 cmd_handle_fatal (idata);
194 rc = imap_cmd_step (idata);
195 while (rc == IMAP_CMD_CONTINUE);
197 if (rc == IMAP_CMD_BAD) {
198 if (imap_reconnect (idata->ctx) != 0) {
204 if (rc == IMAP_CMD_NO && (flags & IMAP_CMD_FAIL_OK))
207 if (rc != IMAP_CMD_OK) {
208 if (flags & IMAP_CMD_FAIL_OK)
211 debug_print (1, ("command failed: %s\n", idata->cmd.buf));
218 /* imap_cmd_running: Returns whether an IMAP command is in progress. */
219 int imap_cmd_running (IMAP_DATA * idata)
221 if (idata->cmd.state == IMAP_CMD_CONTINUE ||
222 idata->cmd.state == IMAP_CMD_RESPOND)
228 /* imap_cmd_finish: Attempts to perform cleanup (eg fetch new mail if
229 * detected, do expunge). Called automatically by imap_cmd_step, but
230 * may be called at any time. Called by imap_check_mailbox just before
231 * the index is refreshed, for instance. */
232 void imap_cmd_finish (IMAP_DATA * idata)
234 if (idata->status == IMAP_FATAL) {
235 cmd_handle_fatal (idata);
239 if (!(idata->state == IMAP_SELECTED) || idata->ctx->closing)
242 if (idata->reopen & IMAP_REOPEN_ALLOW) {
243 int count = idata->newMailCount;
245 if (!(idata->reopen & IMAP_EXPUNGE_PENDING) &&
246 (idata->reopen & IMAP_NEWMAIL_PENDING)
247 && count > idata->ctx->msgcount) {
248 /* read new mail messages */
249 debug_print (2, ("Fetching new mail\n"));
250 /* check_status: curs_main uses imap_check_mailbox to detect
251 * whether the index needs updating */
252 idata->check_status = IMAP_NEWMAIL_PENDING;
253 imap_read_headers (idata, idata->ctx->msgcount, count - 1);
255 else if (idata->reopen & IMAP_EXPUNGE_PENDING) {
256 debug_print (2, ("Expunging mailbox\n"));
257 imap_expunge_mailbox (idata);
258 /* Detect whether we've gotten unexpected EXPUNGE messages */
259 if (idata->reopen & IMAP_EXPUNGE_PENDING &&
260 !(idata->reopen & IMAP_EXPUNGE_EXPECTED))
261 idata->check_status = IMAP_EXPUNGE_PENDING;
262 idata->reopen &= ~(IMAP_EXPUNGE_PENDING | IMAP_NEWMAIL_PENDING |
263 IMAP_EXPUNGE_EXPECTED);
270 /* cmd_handle_fatal: when IMAP_DATA is in fatal state, do what we can */
271 static void cmd_handle_fatal (IMAP_DATA * idata)
273 idata->status = IMAP_FATAL;
275 if ((idata->state == IMAP_SELECTED) &&
276 (idata->reopen & IMAP_REOPEN_ALLOW) && !idata->ctx->closing) {
277 /*mx_fastclose_mailbox (idata->ctx); */
278 mutt_error (_("Mailbox closed"));
280 idata->state = IMAP_DISCONNECTED;
281 if (imap_reconnect (idata->ctx) != 0)
282 mx_fastclose_mailbox (idata->ctx);
285 if (idata->state != IMAP_SELECTED) {
286 idata->state = IMAP_DISCONNECTED;
291 /* cmd_handle_untagged: fallback parser for otherwise unhandled messages. */
292 static int cmd_handle_untagged (IMAP_DATA * idata)
298 s = imap_next_word (idata->cmd.buf);
300 if ((idata->state == IMAP_SELECTED) && isdigit ((unsigned char) *s)) {
302 s = imap_next_word (s);
304 /* EXISTS and EXPUNGE are always related to the SELECTED mailbox for the
305 * connection, so update that one.
307 if (ascii_strncasecmp ("EXISTS", s, 6) == 0) {
308 debug_print (2, ("Handling EXISTS\n"));
310 /* new mail arrived */
313 if (!(idata->reopen & IMAP_EXPUNGE_PENDING) &&
314 count < idata->ctx->msgcount) {
315 /* something is wrong because the server reported fewer messages
316 * than we previously saw
318 mutt_error _("Fatal error. Message count is out of sync!");
320 idata->status = IMAP_FATAL;
323 /* at least the InterChange server sends EXISTS messages freely,
324 * even when there is no new mail */
325 else if (count == idata->ctx->msgcount)
326 debug_print (3, ("superfluous EXISTS message.\n"));
328 if (!(idata->reopen & IMAP_EXPUNGE_PENDING)) {
329 debug_print (2, ("New mail in %s - %d messages total.\n", idata->mailbox, count));
330 idata->reopen |= IMAP_NEWMAIL_PENDING;
332 idata->newMailCount = count;
335 /* pn vs. s: need initial seqno */
336 else if (ascii_strncasecmp ("EXPUNGE", s, 7) == 0)
337 cmd_parse_expunge (idata, pn);
338 else if (ascii_strncasecmp ("FETCH", s, 5) == 0)
339 cmd_parse_fetch (idata, pn);
341 else if (ascii_strncasecmp ("CAPABILITY", s, 10) == 0)
342 cmd_parse_capabilities (idata, s);
343 else if (ascii_strncasecmp ("MYRIGHTS", s, 8) == 0)
344 cmd_parse_myrights (idata, s);
345 else if (ascii_strncasecmp ("BYE", s, 3) == 0) {
346 debug_print (2, ("Handling BYE\n"));
348 /* check if we're logging out */
349 if (idata->status == IMAP_BYE)
352 /* server shut down our connection */
355 mutt_error ("%s", s);
356 idata->status = IMAP_BYE;
358 /*if (imap_reconnect(idata->ctx)!=0) {
359 if (idata->state == IMAP_SELECTED)
360 mx_fastclose_mailbox (idata->ctx); *//* XXX memleak? */
361 mutt_socket_close (idata->conn);
362 idata->state = IMAP_DISCONNECTED;
368 else if (option (OPTIMAPSERVERNOISE)
369 && (ascii_strncasecmp ("NO", s, 2) == 0)) {
370 debug_print (2, ("Handling untagged NO\n"));
372 /* Display the warning message from the server */
373 mutt_error ("%s", s + 3);
380 /* cmd_make_sequence: make a tag suitable for starting an IMAP command */
381 static void cmd_make_sequence (IMAP_DATA * idata)
383 snprintf (idata->cmd.seq, sizeof (idata->cmd.seq), "a%04u", idata->seqno++);
385 if (idata->seqno > 9999)
389 /* cmd_parse_capabilities: set capability bits according to CAPABILITY
391 static void cmd_parse_capabilities (IMAP_DATA * idata, char *s)
395 debug_print (2, ("Handling CAPABILITY\n"));
397 s = imap_next_word (s);
398 FREE (&idata->capstr);
399 idata->capstr = safe_strdup (s);
401 memset (idata->capabilities, 0, sizeof (idata->capabilities));
404 for (x = 0; x < CAPMAX; x++)
405 if (imap_wordcasecmp (Capabilities[x], s) == 0) {
406 mutt_bit_set (idata->capabilities, x);
409 s = imap_next_word (s);
413 /* cmd_parse_expunge: mark headers with new sequence ID and mark idata to
414 * be reopened at our earliest convenience */
415 static void cmd_parse_expunge (IMAP_DATA * idata, const char *s)
420 debug_print (2, ("Handling EXPUNGE\n"));
424 /* walk headers, zero seqno of expunged message, decrement seqno of those
425 * above. Possibly we could avoid walking the whole list by resorting
426 * and guessing a good starting point, but I'm guessing the resort would
427 * nullify the gains */
428 for (cur = 0; cur < idata->ctx->msgcount; cur++) {
429 h = idata->ctx->hdrs[cur];
431 if (h->index + 1 == expno)
433 else if (h->index + 1 > expno)
437 idata->reopen |= IMAP_EXPUNGE_PENDING;
440 /* cmd_parse_fetch: Load fetch response into IMAP_DATA. Currently only
441 * handles unanticipated FETCH responses, and only FLAGS data. We get
442 * these if another client has changed flags for a mailbox we've selected.
443 * Of course, a lot of code here duplicates code in message.c. */
444 static void cmd_parse_fetch (IMAP_DATA * idata, char *s)
449 debug_print (2, ("Handling FETCH\n"));
453 if (msgno <= idata->ctx->msgcount)
454 /* see cmd_parse_expunge */
455 for (cur = 0; cur < idata->ctx->msgcount; cur++) {
456 h = idata->ctx->hdrs[cur];
458 if (h->active && h->index + 1 == msgno) {
459 debug_print (2, ("Message UID %d updated\n", HEADER_DATA (h)->uid));
467 debug_print (1, ("FETCH response ignored for this message\n"));
472 s = imap_next_word (s);
473 s = imap_next_word (s);
476 debug_print (1, ("Malformed FETCH response\n"));
481 if (ascii_strncasecmp ("FLAGS", s, 5) != 0) {
482 debug_print (2, ("Only handle FLAGS updates\n"));
486 /* If server flags could conflict with mutt's flags, reopen the mailbox. */
488 idata->reopen |= IMAP_EXPUNGE_PENDING;
490 imap_set_flags (idata, h, s);
491 idata->check_status = IMAP_FLAGS_PENDING;
495 /* cmd_parse_myrights: set rights bits according to MYRIGHTS response */
496 static void cmd_parse_myrights (IMAP_DATA * idata, char *s)
498 debug_print (2, ("Handling MYRIGHTS\n"));
500 s = imap_next_word (s);
501 s = imap_next_word (s);
503 /* zero out current rights set */
504 memset (idata->rights, 0, sizeof (idata->rights));
506 while (*s && !isspace ((unsigned char) *s)) {
509 mutt_bit_set (idata->rights, ACL_LOOKUP);
512 mutt_bit_set (idata->rights, ACL_READ);
515 mutt_bit_set (idata->rights, ACL_SEEN);
518 mutt_bit_set (idata->rights, ACL_WRITE);
521 mutt_bit_set (idata->rights, ACL_INSERT);
524 mutt_bit_set (idata->rights, ACL_POST);
527 mutt_bit_set (idata->rights, ACL_CREATE);
530 mutt_bit_set (idata->rights, ACL_DELETE);
533 mutt_bit_set (idata->rights, ACL_ADMIN);