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lockfile: change lock_file::filename into a strbuf
[git.git] / imap-send.c
blob70bcc7a4e533bb04e8c515e8831a75ec93d2d066
1 /*
2 * git-imap-send - drops patches into an imap Drafts folder
3 * derived from isync/mbsync - mailbox synchronizer
4 *
5 * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
6 * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
7 * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
8 * Copyright (C) 2006 Mike McCormack
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 * GNU General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
23 */
24
25 #include "cache.h"
26 #include "credential.h"
27 #include "exec_cmd.h"
28 #include "run-command.h"
29 #ifdef NO_OPENSSL
30 typedef void *SSL;
31 #endif
32
33 static const char imap_send_usage[] = "git imap-send < <mbox>";
34
35 #undef DRV_OK
36 #define DRV_OK 0
37 #define DRV_MSG_BAD -1
38 #define DRV_BOX_BAD -2
39 #define DRV_STORE_BAD -3
40
41 static int Verbose, Quiet;
42
43 __attribute__((format (printf, 1, 2)))
44 static void imap_info(const char *, ...);
45 __attribute__((format (printf, 1, 2)))
46 static void imap_warn(const char *, ...);
47
48 static char *next_arg(char **);
49
50 __attribute__((format (printf, 3, 4)))
51 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
52
53 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
54 {
55 int len;
56 char tmp[8192];
57
58 len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
59 if (len < 0)
60 die("Fatal: Out of memory");
61 if (len >= sizeof(tmp))
62 die("imap command overflow!");
63 *strp = xmemdupz(tmp, len);
64 return len;
65 }
66
67 struct imap_server_conf {
68 char *name;
69 char *tunnel;
70 char *host;
71 int port;
72 char *folder;
73 char *user;
74 char *pass;
75 int use_ssl;
76 int ssl_verify;
77 int use_html;
78 char *auth_method;
79 };
80
81 static struct imap_server_conf server = {
82 NULL, /* name */
83 NULL, /* tunnel */
84 NULL, /* host */
85 0, /* port */
86 NULL, /* folder */
87 NULL, /* user */
88 NULL, /* pass */
89 0, /* use_ssl */
90 1, /* ssl_verify */
91 0, /* use_html */
92 NULL, /* auth_method */
93 };
94
95 struct imap_socket {
96 int fd[2];
97 SSL *ssl;
98 };
99
100 struct imap_buffer {
101 struct imap_socket sock;
102 int bytes;
103 int offset;
104 char buf[1024];
105 };
106
107 struct imap_cmd;
108
109 struct imap {
110 int uidnext; /* from SELECT responses */
111 unsigned caps, rcaps; /* CAPABILITY results */
112 /* command queue */
113 int nexttag, num_in_progress, literal_pending;
114 struct imap_cmd *in_progress, **in_progress_append;
115 struct imap_buffer buf; /* this is BIG, so put it last */
116 };
117
118 struct imap_store {
119 /* currently open mailbox */
120 const char *name; /* foreign! maybe preset? */
121 int uidvalidity;
122 struct imap *imap;
123 const char *prefix;
124 };
125
126 struct imap_cmd_cb {
127 int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
128 void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
129 void *ctx;
130 char *data;
131 int dlen;
132 int uid;
133 };
134
135 struct imap_cmd {
136 struct imap_cmd *next;
137 struct imap_cmd_cb cb;
138 char *cmd;
139 int tag;
140 };
141
142 #define CAP(cap) (imap->caps & (1 << (cap)))
143
144 enum CAPABILITY {
145 NOLOGIN = 0,
146 UIDPLUS,
147 LITERALPLUS,
148 NAMESPACE,
149 STARTTLS,
150 AUTH_CRAM_MD5
151 };
152
153 static const char *cap_list[] = {
154 "LOGINDISABLED",
155 "UIDPLUS",
156 "LITERAL+",
157 "NAMESPACE",
158 "STARTTLS",
159 "AUTH=CRAM-MD5",
160 };
161
162 #define RESP_OK 0
163 #define RESP_NO 1
164 #define RESP_BAD 2
165
166 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
167
168
169 #ifndef NO_OPENSSL
170 static void ssl_socket_perror(const char *func)
171 {
172 fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
173 }
174 #endif
175
176 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
177 {
178 #ifndef NO_OPENSSL
179 if (sock->ssl) {
180 int sslerr = SSL_get_error(sock->ssl, ret);
181 switch (sslerr) {
182 case SSL_ERROR_NONE:
183 break;
184 case SSL_ERROR_SYSCALL:
185 perror("SSL_connect");
186 break;
187 default:
188 ssl_socket_perror("SSL_connect");
189 break;
190 }
191 } else
192 #endif
193 {
194 if (ret < 0)
195 perror(func);
196 else
197 fprintf(stderr, "%s: unexpected EOF\n", func);
198 }
199 }
200
201 #ifdef NO_OPENSSL
202 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
203 {
204 fprintf(stderr, "SSL requested but SSL support not compiled in\n");
205 return -1;
206 }
207
208 #else
209
210 static int host_matches(const char *host, const char *pattern)
211 {
212 if (pattern[0] == '*' && pattern[1] == '.') {
213 pattern += 2;
214 if (!(host = strchr(host, '.')))
215 return 0;
216 host++;
217 }
218
219 return *host && *pattern && !strcasecmp(host, pattern);
220 }
221
222 static int verify_hostname(X509 *cert, const char *hostname)
223 {
224 int len;
225 X509_NAME *subj;
226 char cname[1000];
227 int i, found;
228 STACK_OF(GENERAL_NAME) *subj_alt_names;
229
230 /* try the DNS subjectAltNames */
231 found = 0;
232 if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
233 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
234 for (i = 0; !found && i < num_subj_alt_names; i++) {
235 GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
236 if (subj_alt_name->type == GEN_DNS &&
237 strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
238 host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
239 found = 1;
240 }
241 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
242 }
243 if (found)
244 return 0;
245
246 /* try the common name */
247 if (!(subj = X509_get_subject_name(cert)))
248 return error("cannot get certificate subject");
249 if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
250 return error("cannot get certificate common name");
251 if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
252 return 0;
253 return error("certificate owner '%s' does not match hostname '%s'",
254 cname, hostname);
255 }
256
257 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
258 {
259 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
260 const SSL_METHOD *meth;
261 #else
262 SSL_METHOD *meth;
263 #endif
264 SSL_CTX *ctx;
265 int ret;
266 X509 *cert;
267
268 SSL_library_init();
269 SSL_load_error_strings();
270
271 if (use_tls_only)
272 meth = TLSv1_method();
273 else
274 meth = SSLv23_method();
275
276 if (!meth) {
277 ssl_socket_perror("SSLv23_method");
278 return -1;
279 }
280
281 ctx = SSL_CTX_new(meth);
282
283 if (verify)
284 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
285
286 if (!SSL_CTX_set_default_verify_paths(ctx)) {
287 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
288 return -1;
289 }
290 sock->ssl = SSL_new(ctx);
291 if (!sock->ssl) {
292 ssl_socket_perror("SSL_new");
293 return -1;
294 }
295 if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
296 ssl_socket_perror("SSL_set_rfd");
297 return -1;
298 }
299 if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
300 ssl_socket_perror("SSL_set_wfd");
301 return -1;
302 }
303
304 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
305 /*
306 * SNI (RFC4366)
307 * OpenSSL does not document this function, but the implementation
308 * returns 1 on success, 0 on failure after calling SSLerr().
309 */
310 ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
311 if (ret != 1)
312 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
313 #endif
314
315 ret = SSL_connect(sock->ssl);
316 if (ret <= 0) {
317 socket_perror("SSL_connect", sock, ret);
318 return -1;
319 }
320
321 if (verify) {
322 /* make sure the hostname matches that of the certificate */
323 cert = SSL_get_peer_certificate(sock->ssl);
324 if (!cert)
325 return error("unable to get peer certificate.");
326 if (verify_hostname(cert, server.host) < 0)
327 return -1;
328 }
329
330 return 0;
331 }
332 #endif
333
334 static int socket_read(struct imap_socket *sock, char *buf, int len)
335 {
336 ssize_t n;
337 #ifndef NO_OPENSSL
338 if (sock->ssl)
339 n = SSL_read(sock->ssl, buf, len);
340 else
341 #endif
342 n = xread(sock->fd[0], buf, len);
343 if (n <= 0) {
344 socket_perror("read", sock, n);
345 close(sock->fd[0]);
346 close(sock->fd[1]);
347 sock->fd[0] = sock->fd[1] = -1;
348 }
349 return n;
350 }
351
352 static int socket_write(struct imap_socket *sock, const char *buf, int len)
353 {
354 int n;
355 #ifndef NO_OPENSSL
356 if (sock->ssl)
357 n = SSL_write(sock->ssl, buf, len);
358 else
359 #endif
360 n = write_in_full(sock->fd[1], buf, len);
361 if (n != len) {
362 socket_perror("write", sock, n);
363 close(sock->fd[0]);
364 close(sock->fd[1]);
365 sock->fd[0] = sock->fd[1] = -1;
366 }
367 return n;
368 }
369
370 static void socket_shutdown(struct imap_socket *sock)
371 {
372 #ifndef NO_OPENSSL
373 if (sock->ssl) {
374 SSL_shutdown(sock->ssl);
375 SSL_free(sock->ssl);
376 }
377 #endif
378 close(sock->fd[0]);
379 close(sock->fd[1]);
380 }
381
382 /* simple line buffering */
383 static int buffer_gets(struct imap_buffer *b, char **s)
384 {
385 int n;
386 int start = b->offset;
387
388 *s = b->buf + start;
389
390 for (;;) {
391 /* make sure we have enough data to read the \r\n sequence */
392 if (b->offset + 1 >= b->bytes) {
393 if (start) {
394 /* shift down used bytes */
395 *s = b->buf;
396
397 assert(start <= b->bytes);
398 n = b->bytes - start;
399
400 if (n)
401 memmove(b->buf, b->buf + start, n);
402 b->offset -= start;
403 b->bytes = n;
404 start = 0;
405 }
406
407 n = socket_read(&b->sock, b->buf + b->bytes,
408 sizeof(b->buf) - b->bytes);
409
410 if (n <= 0)
411 return -1;
412
413 b->bytes += n;
414 }
415
416 if (b->buf[b->offset] == '\r') {
417 assert(b->offset + 1 < b->bytes);
418 if (b->buf[b->offset + 1] == '\n') {
419 b->buf[b->offset] = 0; /* terminate the string */
420 b->offset += 2; /* next line */
421 if (Verbose)
422 puts(*s);
423 return 0;
424 }
425 }
426
427 b->offset++;
428 }
429 /* not reached */
430 }
431
432 static void imap_info(const char *msg, ...)
433 {
434 va_list va;
435
436 if (!Quiet) {
437 va_start(va, msg);
438 vprintf(msg, va);
439 va_end(va);
440 fflush(stdout);
441 }
442 }
443
444 static void imap_warn(const char *msg, ...)
445 {
446 va_list va;
447
448 if (Quiet < 2) {
449 va_start(va, msg);
450 vfprintf(stderr, msg, va);
451 va_end(va);
452 }
453 }
454
455 static char *next_arg(char **s)
456 {
457 char *ret;
458
459 if (!s || !*s)
460 return NULL;
461 while (isspace((unsigned char) **s))
462 (*s)++;
463 if (!**s) {
464 *s = NULL;
465 return NULL;
466 }
467 if (**s == '"') {
468 ++*s;
469 ret = *s;
470 *s = strchr(*s, '"');
471 } else {
472 ret = *s;
473 while (**s && !isspace((unsigned char) **s))
474 (*s)++;
475 }
476 if (*s) {
477 if (**s)
478 *(*s)++ = 0;
479 if (!**s)
480 *s = NULL;
481 }
482 return ret;
483 }
484
485 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
486 {
487 int ret;
488 va_list va;
489
490 va_start(va, fmt);
491 if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
492 die("Fatal: buffer too small. Please report a bug.");
493 va_end(va);
494 return ret;
495 }
496
497 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
498 struct imap_cmd_cb *cb,
499 const char *fmt, va_list ap)
500 {
501 struct imap *imap = ctx->imap;
502 struct imap_cmd *cmd;
503 int n, bufl;
504 char buf[1024];
505
506 cmd = xmalloc(sizeof(struct imap_cmd));
507 nfvasprintf(&cmd->cmd, fmt, ap);
508 cmd->tag = ++imap->nexttag;
509
510 if (cb)
511 cmd->cb = *cb;
512 else
513 memset(&cmd->cb, 0, sizeof(cmd->cb));
514
515 while (imap->literal_pending)
516 get_cmd_result(ctx, NULL);
517
518 if (!cmd->cb.data)
519 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
520 else
521 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
522 cmd->tag, cmd->cmd, cmd->cb.dlen,
523 CAP(LITERALPLUS) ? "+" : "");
524
525 if (Verbose) {
526 if (imap->num_in_progress)
527 printf("(%d in progress) ", imap->num_in_progress);
528 if (!starts_with(cmd->cmd, "LOGIN"))
529 printf(">>> %s", buf);
530 else
531 printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
532 }
533 if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
534 free(cmd->cmd);
535 free(cmd);
536 if (cb)
537 free(cb->data);
538 return NULL;
539 }
540 if (cmd->cb.data) {
541 if (CAP(LITERALPLUS)) {
542 n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
543 free(cmd->cb.data);
544 if (n != cmd->cb.dlen ||
545 socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
546 free(cmd->cmd);
547 free(cmd);
548 return NULL;
549 }
550 cmd->cb.data = NULL;
551 } else
552 imap->literal_pending = 1;
553 } else if (cmd->cb.cont)
554 imap->literal_pending = 1;
555 cmd->next = NULL;
556 *imap->in_progress_append = cmd;
557 imap->in_progress_append = &cmd->next;
558 imap->num_in_progress++;
559 return cmd;
560 }
561
562 __attribute__((format (printf, 3, 4)))
563 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
564 const char *fmt, ...)
565 {
566 va_list ap;
567 struct imap_cmd *cmdp;
568
569 va_start(ap, fmt);
570 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
571 va_end(ap);
572 if (!cmdp)
573 return RESP_BAD;
574
575 return get_cmd_result(ctx, cmdp);
576 }
577
578 __attribute__((format (printf, 3, 4)))
579 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
580 const char *fmt, ...)
581 {
582 va_list ap;
583 struct imap_cmd *cmdp;
584
585 va_start(ap, fmt);
586 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
587 va_end(ap);
588 if (!cmdp)
589 return DRV_STORE_BAD;
590
591 switch (get_cmd_result(ctx, cmdp)) {
592 case RESP_BAD: return DRV_STORE_BAD;
593 case RESP_NO: return DRV_MSG_BAD;
594 default: return DRV_OK;
595 }
596 }
597
598 static int skip_imap_list_l(char **sp, int level)
599 {
600 char *s = *sp;
601
602 for (;;) {
603 while (isspace((unsigned char)*s))
604 s++;
605 if (level && *s == ')') {
606 s++;
607 break;
608 }
609 if (*s == '(') {
610 /* sublist */
611 s++;
612 if (skip_imap_list_l(&s, level + 1))
613 goto bail;
614 } else if (*s == '"') {
615 /* quoted string */
616 s++;
617 for (; *s != '"'; s++)
618 if (!*s)
619 goto bail;
620 s++;
621 } else {
622 /* atom */
623 for (; *s && !isspace((unsigned char)*s); s++)
624 if (level && *s == ')')
625 break;
626 }
627
628 if (!level)
629 break;
630 if (!*s)
631 goto bail;
632 }
633 *sp = s;
634 return 0;
635
636 bail:
637 return -1;
638 }
639
640 static void skip_list(char **sp)
641 {
642 skip_imap_list_l(sp, 0);
643 }
644
645 static void parse_capability(struct imap *imap, char *cmd)
646 {
647 char *arg;
648 unsigned i;
649
650 imap->caps = 0x80000000;
651 while ((arg = next_arg(&cmd)))
652 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
653 if (!strcmp(cap_list[i], arg))
654 imap->caps |= 1 << i;
655 imap->rcaps = imap->caps;
656 }
657
658 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
659 char *s)
660 {
661 struct imap *imap = ctx->imap;
662 char *arg, *p;
663
664 if (*s != '[')
665 return RESP_OK; /* no response code */
666 s++;
667 if (!(p = strchr(s, ']'))) {
668 fprintf(stderr, "IMAP error: malformed response code\n");
669 return RESP_BAD;
670 }
671 *p++ = 0;
672 arg = next_arg(&s);
673 if (!strcmp("UIDVALIDITY", arg)) {
674 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
675 fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
676 return RESP_BAD;
677 }
678 } else if (!strcmp("UIDNEXT", arg)) {
679 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
680 fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
681 return RESP_BAD;
682 }
683 } else if (!strcmp("CAPABILITY", arg)) {
684 parse_capability(imap, s);
685 } else if (!strcmp("ALERT", arg)) {
686 /* RFC2060 says that these messages MUST be displayed
687 * to the user
688 */
689 for (; isspace((unsigned char)*p); p++);
690 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
691 } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
692 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
693 !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
694 fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
695 return RESP_BAD;
696 }
697 }
698 return RESP_OK;
699 }
700
701 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
702 {
703 struct imap *imap = ctx->imap;
704 struct imap_cmd *cmdp, **pcmdp;
705 char *cmd, *arg, *arg1;
706 int n, resp, resp2, tag;
707
708 for (;;) {
709 if (buffer_gets(&imap->buf, &cmd))
710 return RESP_BAD;
711
712 arg = next_arg(&cmd);
713 if (*arg == '*') {
714 arg = next_arg(&cmd);
715 if (!arg) {
716 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
717 return RESP_BAD;
718 }
719
720 if (!strcmp("NAMESPACE", arg)) {
721 /* rfc2342 NAMESPACE response. */
722 skip_list(&cmd); /* Personal mailboxes */
723 skip_list(&cmd); /* Others' mailboxes */
724 skip_list(&cmd); /* Shared mailboxes */
725 } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
726 !strcmp("NO", arg) || !strcmp("BYE", arg)) {
727 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
728 return resp;
729 } else if (!strcmp("CAPABILITY", arg)) {
730 parse_capability(imap, cmd);
731 } else if ((arg1 = next_arg(&cmd))) {
732 ; /*
733 * Unhandled response-data with at least two words.
734 * Ignore it.
735 *
736 * NEEDSWORK: Previously this case handled '<num> EXISTS'
737 * and '<num> RECENT' but as a probably-unintended side
738 * effect it ignores other unrecognized two-word
739 * responses. imap-send doesn't ever try to read
740 * messages or mailboxes these days, so consider
741 * eliminating this case.
742 */
743 } else {
744 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
745 return RESP_BAD;
746 }
747 } else if (!imap->in_progress) {
748 fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
749 return RESP_BAD;
750 } else if (*arg == '+') {
751 /* This can happen only with the last command underway, as
752 it enforces a round-trip. */
753 cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
754 offsetof(struct imap_cmd, next));
755 if (cmdp->cb.data) {
756 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
757 free(cmdp->cb.data);
758 cmdp->cb.data = NULL;
759 if (n != (int)cmdp->cb.dlen)
760 return RESP_BAD;
761 } else if (cmdp->cb.cont) {
762 if (cmdp->cb.cont(ctx, cmdp, cmd))
763 return RESP_BAD;
764 } else {
765 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
766 return RESP_BAD;
767 }
768 if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
769 return RESP_BAD;
770 if (!cmdp->cb.cont)
771 imap->literal_pending = 0;
772 if (!tcmd)
773 return DRV_OK;
774 } else {
775 tag = atoi(arg);
776 for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
777 if (cmdp->tag == tag)
778 goto gottag;
779 fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
780 return RESP_BAD;
781 gottag:
782 if (!(*pcmdp = cmdp->next))
783 imap->in_progress_append = pcmdp;
784 imap->num_in_progress--;
785 if (cmdp->cb.cont || cmdp->cb.data)
786 imap->literal_pending = 0;
787 arg = next_arg(&cmd);
788 if (!strcmp("OK", arg))
789 resp = DRV_OK;
790 else {
791 if (!strcmp("NO", arg))
792 resp = RESP_NO;
793 else /*if (!strcmp("BAD", arg))*/
794 resp = RESP_BAD;
795 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
796 !starts_with(cmdp->cmd, "LOGIN") ?
797 cmdp->cmd : "LOGIN <user> <pass>",
798 arg, cmd ? cmd : "");
799 }
800 if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
801 resp = resp2;
802 if (cmdp->cb.done)
803 cmdp->cb.done(ctx, cmdp, resp);
804 free(cmdp->cb.data);
805 free(cmdp->cmd);
806 free(cmdp);
807 if (!tcmd || tcmd == cmdp)
808 return resp;
809 }
810 }
811 /* not reached */
812 }
813
814 static void imap_close_server(struct imap_store *ictx)
815 {
816 struct imap *imap = ictx->imap;
817
818 if (imap->buf.sock.fd[0] != -1) {
819 imap_exec(ictx, NULL, "LOGOUT");
820 socket_shutdown(&imap->buf.sock);
821 }
822 free(imap);
823 }
824
825 static void imap_close_store(struct imap_store *ctx)
826 {
827 imap_close_server(ctx);
828 free(ctx);
829 }
830
831 #ifndef NO_OPENSSL
832
833 /*
834 * hexchar() and cram() functions are based on the code from the isync
835 * project (http://isync.sf.net/).
836 */
837 static char hexchar(unsigned int b)
838 {
839 return b < 10 ? '0' + b : 'a' + (b - 10);
840 }
841
842 #define ENCODED_SIZE(n) (4*((n+2)/3))
843 static char *cram(const char *challenge_64, const char *user, const char *pass)
844 {
845 int i, resp_len, encoded_len, decoded_len;
846 HMAC_CTX hmac;
847 unsigned char hash[16];
848 char hex[33];
849 char *response, *response_64, *challenge;
850
851 /*
852 * length of challenge_64 (i.e. base-64 encoded string) is a good
853 * enough upper bound for challenge (decoded result).
854 */
855 encoded_len = strlen(challenge_64);
856 challenge = xmalloc(encoded_len);
857 decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
858 (unsigned char *)challenge_64, encoded_len);
859 if (decoded_len < 0)
860 die("invalid challenge %s", challenge_64);
861 HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
862 HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
863 HMAC_Final(&hmac, hash, NULL);
864 HMAC_CTX_cleanup(&hmac);
865
866 hex[32] = 0;
867 for (i = 0; i < 16; i++) {
868 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
869 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
870 }
871
872 /* response: "<user> <digest in hex>" */
873 resp_len = strlen(user) + 1 + strlen(hex) + 1;
874 response = xmalloc(resp_len);
875 sprintf(response, "%s %s", user, hex);
876
877 response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
878 encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
879 (unsigned char *)response, resp_len);
880 if (encoded_len < 0)
881 die("EVP_EncodeBlock error");
882 response_64[encoded_len] = '\0';
883 return (char *)response_64;
884 }
885
886 #else
887
888 static char *cram(const char *challenge_64, const char *user, const char *pass)
889 {
890 die("If you want to use CRAM-MD5 authenticate method, "
891 "you have to build git-imap-send with OpenSSL library.");
892 }
893
894 #endif
895
896 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
897 {
898 int ret;
899 char *response;
900
901 response = cram(prompt, server.user, server.pass);
902
903 ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
904 if (ret != strlen(response))
905 return error("IMAP error: sending response failed");
906
907 free(response);
908
909 return 0;
910 }
911
912 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
913 {
914 struct credential cred = CREDENTIAL_INIT;
915 struct imap_store *ctx;
916 struct imap *imap;
917 char *arg, *rsp;
918 int s = -1, preauth;
919
920 ctx = xcalloc(1, sizeof(*ctx));
921
922 ctx->imap = imap = xcalloc(1, sizeof(*imap));
923 imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
924 imap->in_progress_append = &imap->in_progress;
925
926 /* open connection to IMAP server */
927
928 if (srvc->tunnel) {
929 struct child_process tunnel = CHILD_PROCESS_INIT;
930
931 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
932
933 argv_array_push(&tunnel.args, srvc->tunnel);
934 tunnel.use_shell = 1;
935 tunnel.in = -1;
936 tunnel.out = -1;
937 if (start_command(&tunnel))
938 die("cannot start proxy %s", srvc->tunnel);
939
940 imap->buf.sock.fd[0] = tunnel.out;
941 imap->buf.sock.fd[1] = tunnel.in;
942
943 imap_info("ok\n");
944 } else {
945 #ifndef NO_IPV6
946 struct addrinfo hints, *ai0, *ai;
947 int gai;
948 char portstr[6];
949
950 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
951
952 memset(&hints, 0, sizeof(hints));
953 hints.ai_socktype = SOCK_STREAM;
954 hints.ai_protocol = IPPROTO_TCP;
955
956 imap_info("Resolving %s... ", srvc->host);
957 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
958 if (gai) {
959 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
960 goto bail;
961 }
962 imap_info("ok\n");
963
964 for (ai0 = ai; ai; ai = ai->ai_next) {
965 char addr[NI_MAXHOST];
966
967 s = socket(ai->ai_family, ai->ai_socktype,
968 ai->ai_protocol);
969 if (s < 0)
970 continue;
971
972 getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
973 sizeof(addr), NULL, 0, NI_NUMERICHOST);
974 imap_info("Connecting to [%s]:%s... ", addr, portstr);
975
976 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
977 close(s);
978 s = -1;
979 perror("connect");
980 continue;
981 }
982
983 break;
984 }
985 freeaddrinfo(ai0);
986 #else /* NO_IPV6 */
987 struct hostent *he;
988 struct sockaddr_in addr;
989
990 memset(&addr, 0, sizeof(addr));
991 addr.sin_port = htons(srvc->port);
992 addr.sin_family = AF_INET;
993
994 imap_info("Resolving %s... ", srvc->host);
995 he = gethostbyname(srvc->host);
996 if (!he) {
997 perror("gethostbyname");
998 goto bail;
999 }
1000 imap_info("ok\n");
1001
1002 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1003
1004 s = socket(PF_INET, SOCK_STREAM, 0);
1005
1006 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1007 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1008 close(s);
1009 s = -1;
1010 perror("connect");
1011 }
1012 #endif
1013 if (s < 0) {
1014 fputs("Error: unable to connect to server.\n", stderr);
1015 goto bail;
1016 }
1017
1018 imap->buf.sock.fd[0] = s;
1019 imap->buf.sock.fd[1] = dup(s);
1020
1021 if (srvc->use_ssl &&
1022 ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1023 close(s);
1024 goto bail;
1025 }
1026 imap_info("ok\n");
1027 }
1028
1029 /* read the greeting string */
1030 if (buffer_gets(&imap->buf, &rsp)) {
1031 fprintf(stderr, "IMAP error: no greeting response\n");
1032 goto bail;
1033 }
1034 arg = next_arg(&rsp);
1035 if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1036 fprintf(stderr, "IMAP error: invalid greeting response\n");
1037 goto bail;
1038 }
1039 preauth = 0;
1040 if (!strcmp("PREAUTH", arg))
1041 preauth = 1;
1042 else if (strcmp("OK", arg) != 0) {
1043 fprintf(stderr, "IMAP error: unknown greeting response\n");
1044 goto bail;
1045 }
1046 parse_response_code(ctx, NULL, rsp);
1047 if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1048 goto bail;
1049
1050 if (!preauth) {
1051 #ifndef NO_OPENSSL
1052 if (!srvc->use_ssl && CAP(STARTTLS)) {
1053 if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1054 goto bail;
1055 if (ssl_socket_connect(&imap->buf.sock, 1,
1056 srvc->ssl_verify))
1057 goto bail;
1058 /* capabilities may have changed, so get the new capabilities */
1059 if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1060 goto bail;
1061 }
1062 #endif
1063 imap_info("Logging in...\n");
1064 if (!srvc->user || !srvc->pass) {
1065 cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1066 cred.host = xstrdup(srvc->host);
1067
1068 if (srvc->user)
1069 cred.username = xstrdup(srvc->user);
1070 if (srvc->pass)
1071 cred.password = xstrdup(srvc->pass);
1072
1073 credential_fill(&cred);
1074
1075 if (!srvc->user)
1076 srvc->user = xstrdup(cred.username);
1077 if (!srvc->pass)
1078 srvc->pass = xstrdup(cred.password);
1079 }
1080
1081 if (CAP(NOLOGIN)) {
1082 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1083 goto bail;
1084 }
1085
1086 if (srvc->auth_method) {
1087 struct imap_cmd_cb cb;
1088
1089 if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1090 if (!CAP(AUTH_CRAM_MD5)) {
1091 fprintf(stderr, "You specified"
1092 "CRAM-MD5 as authentication method, "
1093 "but %s doesn't support it.\n", srvc->host);
1094 goto bail;
1095 }
1096 /* CRAM-MD5 */
1097
1098 memset(&cb, 0, sizeof(cb));
1099 cb.cont = auth_cram_md5;
1100 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1101 fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1102 goto bail;
1103 }
1104 } else {
1105 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1106 goto bail;
1107 }
1108 } else {
1109 if (!imap->buf.sock.ssl)
1110 imap_warn("*** IMAP Warning *** Password is being "
1111 "sent in the clear\n");
1112 if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1113 fprintf(stderr, "IMAP error: LOGIN failed\n");
1114 goto bail;
1115 }
1116 }
1117 } /* !preauth */
1118
1119 if (cred.username)
1120 credential_approve(&cred);
1121 credential_clear(&cred);
1122
1123 /* check the target mailbox exists */
1124 ctx->name = folder;
1125 switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1126 case RESP_OK:
1127 /* ok */
1128 break;
1129 case RESP_BAD:
1130 fprintf(stderr, "IMAP error: could not check mailbox\n");
1131 goto out;
1132 case RESP_NO:
1133 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1134 imap_info("Created missing mailbox\n");
1135 } else {
1136 fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1137 goto out;
1138 }
1139 break;
1140 }
1141
1142 ctx->prefix = "";
1143 return ctx;
1144
1145 bail:
1146 if (cred.username)
1147 credential_reject(&cred);
1148 credential_clear(&cred);
1149
1150 out:
1151 imap_close_store(ctx);
1152 return NULL;
1153 }
1154
1155 /*
1156 * Insert CR characters as necessary in *msg to ensure that every LF
1157 * character in *msg is preceded by a CR.
1158 */
1159 static void lf_to_crlf(struct strbuf *msg)
1160 {
1161 char *new;
1162 size_t i, j;
1163 char lastc;
1164
1165 /* First pass: tally, in j, the size of the new string: */
1166 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1167 if (msg->buf[i] == '\n' && lastc != '\r')
1168 j++; /* a CR will need to be added here */
1169 lastc = msg->buf[i];
1170 j++;
1171 }
1172
1173 new = xmalloc(j + 1);
1174
1175 /*
1176 * Second pass: write the new string. Note that this loop is
1177 * otherwise identical to the first pass.
1178 */
1179 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1180 if (msg->buf[i] == '\n' && lastc != '\r')
1181 new[j++] = '\r';
1182 lastc = new[j++] = msg->buf[i];
1183 }
1184 strbuf_attach(msg, new, j, j + 1);
1185 }
1186
1187 /*
1188 * Store msg to IMAP. Also detach and free the data from msg->data,
1189 * leaving msg->data empty.
1190 */
1191 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1192 {
1193 struct imap *imap = ctx->imap;
1194 struct imap_cmd_cb cb;
1195 const char *prefix, *box;
1196 int ret;
1197
1198 lf_to_crlf(msg);
1199 memset(&cb, 0, sizeof(cb));
1200
1201 cb.dlen = msg->len;
1202 cb.data = strbuf_detach(msg, NULL);
1203
1204 box = ctx->name;
1205 prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1206 ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1207 imap->caps = imap->rcaps;
1208 if (ret != DRV_OK)
1209 return ret;
1210
1211 return DRV_OK;
1212 }
1213
1214 static void wrap_in_html(struct strbuf *msg)
1215 {
1216 struct strbuf buf = STRBUF_INIT;
1217 static char *content_type = "Content-Type: text/html;\n";
1218 static char *pre_open = "<pre>\n";
1219 static char *pre_close = "</pre>\n";
1220 const char *body = strstr(msg->buf, "\n\n");
1221
1222 if (!body)
1223 return; /* Headers but no body; no wrapping needed */
1224
1225 body += 2;
1226
1227 strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1228 strbuf_addstr(&buf, content_type);
1229 strbuf_addch(&buf, '\n');
1230 strbuf_addstr(&buf, pre_open);
1231 strbuf_addstr_xml_quoted(&buf, body);
1232 strbuf_addstr(&buf, pre_close);
1233
1234 strbuf_release(msg);
1235 *msg = buf;
1236 }
1237
1238 #define CHUNKSIZE 0x1000
1239
1240 static int read_message(FILE *f, struct strbuf *all_msgs)
1241 {
1242 do {
1243 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1244 break;
1245 } while (!feof(f));
1246
1247 return ferror(f) ? -1 : 0;
1248 }
1249
1250 static int count_messages(struct strbuf *all_msgs)
1251 {
1252 int count = 0;
1253 char *p = all_msgs->buf;
1254
1255 while (1) {
1256 if (starts_with(p, "From ")) {
1257 p = strstr(p+5, "\nFrom: ");
1258 if (!p) break;
1259 p = strstr(p+7, "\nDate: ");
1260 if (!p) break;
1261 p = strstr(p+7, "\nSubject: ");
1262 if (!p) break;
1263 p += 10;
1264 count++;
1265 }
1266 p = strstr(p+5, "\nFrom ");
1267 if (!p)
1268 break;
1269 p++;
1270 }
1271 return count;
1272 }
1273
1274 /*
1275 * Copy the next message from all_msgs, starting at offset *ofs, to
1276 * msg. Update *ofs to the start of the following message. Return
1277 * true iff a message was successfully copied.
1278 */
1279 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1280 {
1281 char *p, *data;
1282 size_t len;
1283
1284 if (*ofs >= all_msgs->len)
1285 return 0;
1286
1287 data = &all_msgs->buf[*ofs];
1288 len = all_msgs->len - *ofs;
1289
1290 if (len < 5 || !starts_with(data, "From "))
1291 return 0;
1292
1293 p = strchr(data, '\n');
1294 if (p) {
1295 p++;
1296 len -= p - data;
1297 *ofs += p - data;
1298 data = p;
1299 }
1300
1301 p = strstr(data, "\nFrom ");
1302 if (p)
1303 len = &p[1] - data;
1304
1305 strbuf_add(msg, data, len);
1306 *ofs += len;
1307 return 1;
1308 }
1309
1310 static void git_imap_config(void)
1311 {
1312 const char *val = NULL;
1313
1314 git_config_get_bool("imap.sslverify", &server.ssl_verify);
1315 git_config_get_bool("imap.preformattedhtml", &server.use_html);
1316 git_config_get_string("imap.folder", &server.folder);
1317
1318 if (!git_config_get_value("imap.host", &val)) {
1319 if (!val) {
1320 git_die_config("imap.host", "Missing value for 'imap.host'");
1321 } else {
1322 if (starts_with(val, "imap:"))
1323 val += 5;
1324 else if (starts_with(val, "imaps:")) {
1325 val += 6;
1326 server.use_ssl = 1;
1327 }
1328 if (starts_with(val, "//"))
1329 val += 2;
1330 server.host = xstrdup(val);
1331 }
1332 }
1333
1334 git_config_get_string("imap.user", &server.user);
1335 git_config_get_string("imap.pass", &server.pass);
1336 git_config_get_int("imap.port", &server.port);
1337 git_config_get_string("imap.tunnel", &server.tunnel);
1338 git_config_get_string("imap.authmethod", &server.auth_method);
1339 }
1340
1341 int main(int argc, char **argv)
1342 {
1343 struct strbuf all_msgs = STRBUF_INIT;
1344 struct strbuf msg = STRBUF_INIT;
1345 struct imap_store *ctx = NULL;
1346 int ofs = 0;
1347 int r;
1348 int total, n = 0;
1349 int nongit_ok;
1350
1351 git_extract_argv0_path(argv[0]);
1352
1353 git_setup_gettext();
1354
1355 if (argc != 1)
1356 usage(imap_send_usage);
1357
1358 setup_git_directory_gently(&nongit_ok);
1359 git_imap_config();
1360
1361 if (!server.port)
1362 server.port = server.use_ssl ? 993 : 143;
1363
1364 if (!server.folder) {
1365 fprintf(stderr, "no imap store specified\n");
1366 return 1;
1367 }
1368 if (!server.host) {
1369 if (!server.tunnel) {
1370 fprintf(stderr, "no imap host specified\n");
1371 return 1;
1372 }
1373 server.host = "tunnel";
1374 }
1375
1376 /* read the messages */
1377 if (read_message(stdin, &all_msgs)) {
1378 fprintf(stderr, "error reading input\n");
1379 return 1;
1380 }
1381
1382 if (all_msgs.len == 0) {
1383 fprintf(stderr, "nothing to send\n");
1384 return 1;
1385 }
1386
1387 total = count_messages(&all_msgs);
1388 if (!total) {
1389 fprintf(stderr, "no messages to send\n");
1390 return 1;
1391 }
1392
1393 /* write it to the imap server */
1394 ctx = imap_open_store(&server, server.folder);
1395 if (!ctx) {
1396 fprintf(stderr, "failed to open store\n");
1397 return 1;
1398 }
1399
1400 fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1401 while (1) {
1402 unsigned percent = n * 100 / total;
1403
1404 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1405 if (!split_msg(&all_msgs, &msg, &ofs))
1406 break;
1407 if (server.use_html)
1408 wrap_in_html(&msg);
1409 r = imap_store_msg(ctx, &msg);
1410 if (r != DRV_OK)
1411 break;
1412 n++;
1413 }
1414 fprintf(stderr, "\n");
1415
1416 imap_close_store(ctx);
1417
1418 return 0;
1419 }
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