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Merge branch 'mm/discourage-commit-a-to-finish-conflict-resolution'
[git/mingw.git] / imap-send.c
blobb7601f6359987ec4c414c9bc295f9b40fcd51e97
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 *user;
73 char *pass;
74 int use_ssl;
75 int ssl_verify;
76 int use_html;
77 char *auth_method;
78 };
79
80 static struct imap_server_conf server = {
81 NULL, /* name */
82 NULL, /* tunnel */
83 NULL, /* host */
84 0, /* port */
85 NULL, /* user */
86 NULL, /* pass */
87 0, /* use_ssl */
88 1, /* ssl_verify */
89 0, /* use_html */
90 NULL, /* auth_method */
91 };
92
93 struct imap_socket {
94 int fd[2];
95 SSL *ssl;
96 };
97
98 struct imap_buffer {
99 struct imap_socket sock;
100 int bytes;
101 int offset;
102 char buf[1024];
103 };
104
105 struct imap_cmd;
106
107 struct imap {
108 int uidnext; /* from SELECT responses */
109 unsigned caps, rcaps; /* CAPABILITY results */
110 /* command queue */
111 int nexttag, num_in_progress, literal_pending;
112 struct imap_cmd *in_progress, **in_progress_append;
113 struct imap_buffer buf; /* this is BIG, so put it last */
114 };
115
116 struct imap_store {
117 /* currently open mailbox */
118 const char *name; /* foreign! maybe preset? */
119 int uidvalidity;
120 struct imap *imap;
121 const char *prefix;
122 };
123
124 struct imap_cmd_cb {
125 int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
126 void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
127 void *ctx;
128 char *data;
129 int dlen;
130 int uid;
131 };
132
133 struct imap_cmd {
134 struct imap_cmd *next;
135 struct imap_cmd_cb cb;
136 char *cmd;
137 int tag;
138 };
139
140 #define CAP(cap) (imap->caps & (1 << (cap)))
141
142 enum CAPABILITY {
143 NOLOGIN = 0,
144 UIDPLUS,
145 LITERALPLUS,
146 NAMESPACE,
147 STARTTLS,
148 AUTH_CRAM_MD5
149 };
150
151 static const char *cap_list[] = {
152 "LOGINDISABLED",
153 "UIDPLUS",
154 "LITERAL+",
155 "NAMESPACE",
156 "STARTTLS",
157 "AUTH=CRAM-MD5",
158 };
159
160 #define RESP_OK 0
161 #define RESP_NO 1
162 #define RESP_BAD 2
163
164 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
165
166
167 #ifndef NO_OPENSSL
168 static void ssl_socket_perror(const char *func)
169 {
170 fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
171 }
172 #endif
173
174 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
175 {
176 #ifndef NO_OPENSSL
177 if (sock->ssl) {
178 int sslerr = SSL_get_error(sock->ssl, ret);
179 switch (sslerr) {
180 case SSL_ERROR_NONE:
181 break;
182 case SSL_ERROR_SYSCALL:
183 perror("SSL_connect");
184 break;
185 default:
186 ssl_socket_perror("SSL_connect");
187 break;
188 }
189 } else
190 #endif
191 {
192 if (ret < 0)
193 perror(func);
194 else
195 fprintf(stderr, "%s: unexpected EOF\n", func);
196 }
197 }
198
199 #ifdef NO_OPENSSL
200 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
201 {
202 fprintf(stderr, "SSL requested but SSL support not compiled in\n");
203 return -1;
204 }
205
206 #else
207
208 static int host_matches(const char *host, const char *pattern)
209 {
210 if (pattern[0] == '*' && pattern[1] == '.') {
211 pattern += 2;
212 if (!(host = strchr(host, '.')))
213 return 0;
214 host++;
215 }
216
217 return *host && *pattern && !strcasecmp(host, pattern);
218 }
219
220 static int verify_hostname(X509 *cert, const char *hostname)
221 {
222 int len;
223 X509_NAME *subj;
224 char cname[1000];
225 int i, found;
226 STACK_OF(GENERAL_NAME) *subj_alt_names;
227
228 /* try the DNS subjectAltNames */
229 found = 0;
230 if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
231 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
232 for (i = 0; !found && i < num_subj_alt_names; i++) {
233 GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
234 if (subj_alt_name->type == GEN_DNS &&
235 strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
236 host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
237 found = 1;
238 }
239 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
240 }
241 if (found)
242 return 0;
243
244 /* try the common name */
245 if (!(subj = X509_get_subject_name(cert)))
246 return error("cannot get certificate subject");
247 if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
248 return error("cannot get certificate common name");
249 if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
250 return 0;
251 return error("certificate owner '%s' does not match hostname '%s'",
252 cname, hostname);
253 }
254
255 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
256 {
257 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
258 const SSL_METHOD *meth;
259 #else
260 SSL_METHOD *meth;
261 #endif
262 SSL_CTX *ctx;
263 int ret;
264 X509 *cert;
265
266 SSL_library_init();
267 SSL_load_error_strings();
268
269 if (use_tls_only)
270 meth = TLSv1_method();
271 else
272 meth = SSLv23_method();
273
274 if (!meth) {
275 ssl_socket_perror("SSLv23_method");
276 return -1;
277 }
278
279 ctx = SSL_CTX_new(meth);
280
281 if (verify)
282 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
283
284 if (!SSL_CTX_set_default_verify_paths(ctx)) {
285 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
286 return -1;
287 }
288 sock->ssl = SSL_new(ctx);
289 if (!sock->ssl) {
290 ssl_socket_perror("SSL_new");
291 return -1;
292 }
293 if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
294 ssl_socket_perror("SSL_set_rfd");
295 return -1;
296 }
297 if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
298 ssl_socket_perror("SSL_set_wfd");
299 return -1;
300 }
301
302 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
303 /*
304 * SNI (RFC4366)
305 * OpenSSL does not document this function, but the implementation
306 * returns 1 on success, 0 on failure after calling SSLerr().
307 */
308 ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
309 if (ret != 1)
310 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
311 #endif
312
313 ret = SSL_connect(sock->ssl);
314 if (ret <= 0) {
315 socket_perror("SSL_connect", sock, ret);
316 return -1;
317 }
318
319 if (verify) {
320 /* make sure the hostname matches that of the certificate */
321 cert = SSL_get_peer_certificate(sock->ssl);
322 if (!cert)
323 return error("unable to get peer certificate.");
324 if (verify_hostname(cert, server.host) < 0)
325 return -1;
326 }
327
328 return 0;
329 }
330 #endif
331
332 static int socket_read(struct imap_socket *sock, char *buf, int len)
333 {
334 ssize_t n;
335 #ifndef NO_OPENSSL
336 if (sock->ssl)
337 n = SSL_read(sock->ssl, buf, len);
338 else
339 #endif
340 n = xread(sock->fd[0], buf, len);
341 if (n <= 0) {
342 socket_perror("read", sock, n);
343 close(sock->fd[0]);
344 close(sock->fd[1]);
345 sock->fd[0] = sock->fd[1] = -1;
346 }
347 return n;
348 }
349
350 static int socket_write(struct imap_socket *sock, const char *buf, int len)
351 {
352 int n;
353 #ifndef NO_OPENSSL
354 if (sock->ssl)
355 n = SSL_write(sock->ssl, buf, len);
356 else
357 #endif
358 n = write_in_full(sock->fd[1], buf, len);
359 if (n != len) {
360 socket_perror("write", sock, n);
361 close(sock->fd[0]);
362 close(sock->fd[1]);
363 sock->fd[0] = sock->fd[1] = -1;
364 }
365 return n;
366 }
367
368 static void socket_shutdown(struct imap_socket *sock)
369 {
370 #ifndef NO_OPENSSL
371 if (sock->ssl) {
372 SSL_shutdown(sock->ssl);
373 SSL_free(sock->ssl);
374 }
375 #endif
376 close(sock->fd[0]);
377 close(sock->fd[1]);
378 }
379
380 /* simple line buffering */
381 static int buffer_gets(struct imap_buffer *b, char **s)
382 {
383 int n;
384 int start = b->offset;
385
386 *s = b->buf + start;
387
388 for (;;) {
389 /* make sure we have enough data to read the \r\n sequence */
390 if (b->offset + 1 >= b->bytes) {
391 if (start) {
392 /* shift down used bytes */
393 *s = b->buf;
394
395 assert(start <= b->bytes);
396 n = b->bytes - start;
397
398 if (n)
399 memmove(b->buf, b->buf + start, n);
400 b->offset -= start;
401 b->bytes = n;
402 start = 0;
403 }
404
405 n = socket_read(&b->sock, b->buf + b->bytes,
406 sizeof(b->buf) - b->bytes);
407
408 if (n <= 0)
409 return -1;
410
411 b->bytes += n;
412 }
413
414 if (b->buf[b->offset] == '\r') {
415 assert(b->offset + 1 < b->bytes);
416 if (b->buf[b->offset + 1] == '\n') {
417 b->buf[b->offset] = 0; /* terminate the string */
418 b->offset += 2; /* next line */
419 if (Verbose)
420 puts(*s);
421 return 0;
422 }
423 }
424
425 b->offset++;
426 }
427 /* not reached */
428 }
429
430 static void imap_info(const char *msg, ...)
431 {
432 va_list va;
433
434 if (!Quiet) {
435 va_start(va, msg);
436 vprintf(msg, va);
437 va_end(va);
438 fflush(stdout);
439 }
440 }
441
442 static void imap_warn(const char *msg, ...)
443 {
444 va_list va;
445
446 if (Quiet < 2) {
447 va_start(va, msg);
448 vfprintf(stderr, msg, va);
449 va_end(va);
450 }
451 }
452
453 static char *next_arg(char **s)
454 {
455 char *ret;
456
457 if (!s || !*s)
458 return NULL;
459 while (isspace((unsigned char) **s))
460 (*s)++;
461 if (!**s) {
462 *s = NULL;
463 return NULL;
464 }
465 if (**s == '"') {
466 ++*s;
467 ret = *s;
468 *s = strchr(*s, '"');
469 } else {
470 ret = *s;
471 while (**s && !isspace((unsigned char) **s))
472 (*s)++;
473 }
474 if (*s) {
475 if (**s)
476 *(*s)++ = 0;
477 if (!**s)
478 *s = NULL;
479 }
480 return ret;
481 }
482
483 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
484 {
485 int ret;
486 va_list va;
487
488 va_start(va, fmt);
489 if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
490 die("Fatal: buffer too small. Please report a bug.");
491 va_end(va);
492 return ret;
493 }
494
495 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
496 struct imap_cmd_cb *cb,
497 const char *fmt, va_list ap)
498 {
499 struct imap *imap = ctx->imap;
500 struct imap_cmd *cmd;
501 int n, bufl;
502 char buf[1024];
503
504 cmd = xmalloc(sizeof(struct imap_cmd));
505 nfvasprintf(&cmd->cmd, fmt, ap);
506 cmd->tag = ++imap->nexttag;
507
508 if (cb)
509 cmd->cb = *cb;
510 else
511 memset(&cmd->cb, 0, sizeof(cmd->cb));
512
513 while (imap->literal_pending)
514 get_cmd_result(ctx, NULL);
515
516 if (!cmd->cb.data)
517 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
518 else
519 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
520 cmd->tag, cmd->cmd, cmd->cb.dlen,
521 CAP(LITERALPLUS) ? "+" : "");
522
523 if (Verbose) {
524 if (imap->num_in_progress)
525 printf("(%d in progress) ", imap->num_in_progress);
526 if (memcmp(cmd->cmd, "LOGIN", 5))
527 printf(">>> %s", buf);
528 else
529 printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
530 }
531 if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
532 free(cmd->cmd);
533 free(cmd);
534 if (cb)
535 free(cb->data);
536 return NULL;
537 }
538 if (cmd->cb.data) {
539 if (CAP(LITERALPLUS)) {
540 n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
541 free(cmd->cb.data);
542 if (n != cmd->cb.dlen ||
543 socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
544 free(cmd->cmd);
545 free(cmd);
546 return NULL;
547 }
548 cmd->cb.data = NULL;
549 } else
550 imap->literal_pending = 1;
551 } else if (cmd->cb.cont)
552 imap->literal_pending = 1;
553 cmd->next = NULL;
554 *imap->in_progress_append = cmd;
555 imap->in_progress_append = &cmd->next;
556 imap->num_in_progress++;
557 return cmd;
558 }
559
560 __attribute__((format (printf, 3, 4)))
561 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
562 const char *fmt, ...)
563 {
564 va_list ap;
565 struct imap_cmd *cmdp;
566
567 va_start(ap, fmt);
568 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
569 va_end(ap);
570 if (!cmdp)
571 return RESP_BAD;
572
573 return get_cmd_result(ctx, cmdp);
574 }
575
576 __attribute__((format (printf, 3, 4)))
577 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
578 const char *fmt, ...)
579 {
580 va_list ap;
581 struct imap_cmd *cmdp;
582
583 va_start(ap, fmt);
584 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
585 va_end(ap);
586 if (!cmdp)
587 return DRV_STORE_BAD;
588
589 switch (get_cmd_result(ctx, cmdp)) {
590 case RESP_BAD: return DRV_STORE_BAD;
591 case RESP_NO: return DRV_MSG_BAD;
592 default: return DRV_OK;
593 }
594 }
595
596 static int skip_imap_list_l(char **sp, int level)
597 {
598 char *s = *sp;
599
600 for (;;) {
601 while (isspace((unsigned char)*s))
602 s++;
603 if (level && *s == ')') {
604 s++;
605 break;
606 }
607 if (*s == '(') {
608 /* sublist */
609 s++;
610 if (skip_imap_list_l(&s, level + 1))
611 goto bail;
612 } else if (*s == '"') {
613 /* quoted string */
614 s++;
615 for (; *s != '"'; s++)
616 if (!*s)
617 goto bail;
618 s++;
619 } else {
620 /* atom */
621 for (; *s && !isspace((unsigned char)*s); s++)
622 if (level && *s == ')')
623 break;
624 }
625
626 if (!level)
627 break;
628 if (!*s)
629 goto bail;
630 }
631 *sp = s;
632 return 0;
633
634 bail:
635 return -1;
636 }
637
638 static void skip_list(char **sp)
639 {
640 skip_imap_list_l(sp, 0);
641 }
642
643 static void parse_capability(struct imap *imap, char *cmd)
644 {
645 char *arg;
646 unsigned i;
647
648 imap->caps = 0x80000000;
649 while ((arg = next_arg(&cmd)))
650 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
651 if (!strcmp(cap_list[i], arg))
652 imap->caps |= 1 << i;
653 imap->rcaps = imap->caps;
654 }
655
656 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
657 char *s)
658 {
659 struct imap *imap = ctx->imap;
660 char *arg, *p;
661
662 if (*s != '[')
663 return RESP_OK; /* no response code */
664 s++;
665 if (!(p = strchr(s, ']'))) {
666 fprintf(stderr, "IMAP error: malformed response code\n");
667 return RESP_BAD;
668 }
669 *p++ = 0;
670 arg = next_arg(&s);
671 if (!strcmp("UIDVALIDITY", arg)) {
672 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
673 fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
674 return RESP_BAD;
675 }
676 } else if (!strcmp("UIDNEXT", arg)) {
677 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
678 fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
679 return RESP_BAD;
680 }
681 } else if (!strcmp("CAPABILITY", arg)) {
682 parse_capability(imap, s);
683 } else if (!strcmp("ALERT", arg)) {
684 /* RFC2060 says that these messages MUST be displayed
685 * to the user
686 */
687 for (; isspace((unsigned char)*p); p++);
688 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
689 } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
690 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
691 !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
692 fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
693 return RESP_BAD;
694 }
695 }
696 return RESP_OK;
697 }
698
699 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
700 {
701 struct imap *imap = ctx->imap;
702 struct imap_cmd *cmdp, **pcmdp;
703 char *cmd, *arg, *arg1;
704 int n, resp, resp2, tag;
705
706 for (;;) {
707 if (buffer_gets(&imap->buf, &cmd))
708 return RESP_BAD;
709
710 arg = next_arg(&cmd);
711 if (*arg == '*') {
712 arg = next_arg(&cmd);
713 if (!arg) {
714 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
715 return RESP_BAD;
716 }
717
718 if (!strcmp("NAMESPACE", arg)) {
719 /* rfc2342 NAMESPACE response. */
720 skip_list(&cmd); /* Personal mailboxes */
721 skip_list(&cmd); /* Others' mailboxes */
722 skip_list(&cmd); /* Shared mailboxes */
723 } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
724 !strcmp("NO", arg) || !strcmp("BYE", arg)) {
725 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
726 return resp;
727 } else if (!strcmp("CAPABILITY", arg)) {
728 parse_capability(imap, cmd);
729 } else if ((arg1 = next_arg(&cmd))) {
730 ; /*
731 * Unhandled response-data with at least two words.
732 * Ignore it.
733 *
734 * NEEDSWORK: Previously this case handled '<num> EXISTS'
735 * and '<num> RECENT' but as a probably-unintended side
736 * effect it ignores other unrecognized two-word
737 * responses. imap-send doesn't ever try to read
738 * messages or mailboxes these days, so consider
739 * eliminating this case.
740 */
741 } else {
742 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
743 return RESP_BAD;
744 }
745 } else if (!imap->in_progress) {
746 fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
747 return RESP_BAD;
748 } else if (*arg == '+') {
749 /* This can happen only with the last command underway, as
750 it enforces a round-trip. */
751 cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
752 offsetof(struct imap_cmd, next));
753 if (cmdp->cb.data) {
754 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
755 free(cmdp->cb.data);
756 cmdp->cb.data = NULL;
757 if (n != (int)cmdp->cb.dlen)
758 return RESP_BAD;
759 } else if (cmdp->cb.cont) {
760 if (cmdp->cb.cont(ctx, cmdp, cmd))
761 return RESP_BAD;
762 } else {
763 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
764 return RESP_BAD;
765 }
766 if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
767 return RESP_BAD;
768 if (!cmdp->cb.cont)
769 imap->literal_pending = 0;
770 if (!tcmd)
771 return DRV_OK;
772 } else {
773 tag = atoi(arg);
774 for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
775 if (cmdp->tag == tag)
776 goto gottag;
777 fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
778 return RESP_BAD;
779 gottag:
780 if (!(*pcmdp = cmdp->next))
781 imap->in_progress_append = pcmdp;
782 imap->num_in_progress--;
783 if (cmdp->cb.cont || cmdp->cb.data)
784 imap->literal_pending = 0;
785 arg = next_arg(&cmd);
786 if (!strcmp("OK", arg))
787 resp = DRV_OK;
788 else {
789 if (!strcmp("NO", arg))
790 resp = RESP_NO;
791 else /*if (!strcmp("BAD", arg))*/
792 resp = RESP_BAD;
793 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
794 memcmp(cmdp->cmd, "LOGIN", 5) ?
795 cmdp->cmd : "LOGIN <user> <pass>",
796 arg, cmd ? cmd : "");
797 }
798 if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
799 resp = resp2;
800 if (cmdp->cb.done)
801 cmdp->cb.done(ctx, cmdp, resp);
802 free(cmdp->cb.data);
803 free(cmdp->cmd);
804 free(cmdp);
805 if (!tcmd || tcmd == cmdp)
806 return resp;
807 }
808 }
809 /* not reached */
810 }
811
812 static void imap_close_server(struct imap_store *ictx)
813 {
814 struct imap *imap = ictx->imap;
815
816 if (imap->buf.sock.fd[0] != -1) {
817 imap_exec(ictx, NULL, "LOGOUT");
818 socket_shutdown(&imap->buf.sock);
819 }
820 free(imap);
821 }
822
823 static void imap_close_store(struct imap_store *ctx)
824 {
825 imap_close_server(ctx);
826 free(ctx);
827 }
828
829 #ifndef NO_OPENSSL
830
831 /*
832 * hexchar() and cram() functions are based on the code from the isync
833 * project (http://isync.sf.net/).
834 */
835 static char hexchar(unsigned int b)
836 {
837 return b < 10 ? '0' + b : 'a' + (b - 10);
838 }
839
840 #define ENCODED_SIZE(n) (4*((n+2)/3))
841 static char *cram(const char *challenge_64, const char *user, const char *pass)
842 {
843 int i, resp_len, encoded_len, decoded_len;
844 HMAC_CTX hmac;
845 unsigned char hash[16];
846 char hex[33];
847 char *response, *response_64, *challenge;
848
849 /*
850 * length of challenge_64 (i.e. base-64 encoded string) is a good
851 * enough upper bound for challenge (decoded result).
852 */
853 encoded_len = strlen(challenge_64);
854 challenge = xmalloc(encoded_len);
855 decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
856 (unsigned char *)challenge_64, encoded_len);
857 if (decoded_len < 0)
858 die("invalid challenge %s", challenge_64);
859 HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
860 HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
861 HMAC_Final(&hmac, hash, NULL);
862 HMAC_CTX_cleanup(&hmac);
863
864 hex[32] = 0;
865 for (i = 0; i < 16; i++) {
866 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
867 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
868 }
869
870 /* response: "<user> <digest in hex>" */
871 resp_len = strlen(user) + 1 + strlen(hex) + 1;
872 response = xmalloc(resp_len);
873 sprintf(response, "%s %s", user, hex);
874
875 response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
876 encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
877 (unsigned char *)response, resp_len);
878 if (encoded_len < 0)
879 die("EVP_EncodeBlock error");
880 response_64[encoded_len] = '\0';
881 return (char *)response_64;
882 }
883
884 #else
885
886 static char *cram(const char *challenge_64, const char *user, const char *pass)
887 {
888 die("If you want to use CRAM-MD5 authenticate method, "
889 "you have to build git-imap-send with OpenSSL library.");
890 }
891
892 #endif
893
894 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
895 {
896 int ret;
897 char *response;
898
899 response = cram(prompt, server.user, server.pass);
900
901 ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
902 if (ret != strlen(response))
903 return error("IMAP error: sending response failed");
904
905 free(response);
906
907 return 0;
908 }
909
910 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
911 {
912 struct credential cred = CREDENTIAL_INIT;
913 struct imap_store *ctx;
914 struct imap *imap;
915 char *arg, *rsp;
916 int s = -1, preauth;
917
918 ctx = xcalloc(1, sizeof(*ctx));
919
920 ctx->imap = imap = xcalloc(sizeof(*imap), 1);
921 imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
922 imap->in_progress_append = &imap->in_progress;
923
924 /* open connection to IMAP server */
925
926 if (srvc->tunnel) {
927 const char *argv[] = { srvc->tunnel, NULL };
928 struct child_process tunnel = CHILD_PROCESS_INIT;
929
930 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
931
932 tunnel.argv = argv;
933 tunnel.use_shell = 1;
934 tunnel.in = -1;
935 tunnel.out = -1;
936 if (start_command(&tunnel))
937 die("cannot start proxy %s", argv[0]);
938
939 imap->buf.sock.fd[0] = tunnel.out;
940 imap->buf.sock.fd[1] = tunnel.in;
941
942 imap_info("ok\n");
943 } else {
944 #ifndef NO_IPV6
945 struct addrinfo hints, *ai0, *ai;
946 int gai;
947 char portstr[6];
948
949 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
950
951 memset(&hints, 0, sizeof(hints));
952 hints.ai_socktype = SOCK_STREAM;
953 hints.ai_protocol = IPPROTO_TCP;
954
955 imap_info("Resolving %s... ", srvc->host);
956 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
957 if (gai) {
958 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
959 goto bail;
960 }
961 imap_info("ok\n");
962
963 for (ai0 = ai; ai; ai = ai->ai_next) {
964 char addr[NI_MAXHOST];
965
966 s = socket(ai->ai_family, ai->ai_socktype,
967 ai->ai_protocol);
968 if (s < 0)
969 continue;
970
971 getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
972 sizeof(addr), NULL, 0, NI_NUMERICHOST);
973 imap_info("Connecting to [%s]:%s... ", addr, portstr);
974
975 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
976 close(s);
977 s = -1;
978 perror("connect");
979 continue;
980 }
981
982 break;
983 }
984 freeaddrinfo(ai0);
985 #else /* NO_IPV6 */
986 struct hostent *he;
987 struct sockaddr_in addr;
988
989 memset(&addr, 0, sizeof(addr));
990 addr.sin_port = htons(srvc->port);
991 addr.sin_family = AF_INET;
992
993 imap_info("Resolving %s... ", srvc->host);
994 he = gethostbyname(srvc->host);
995 if (!he) {
996 perror("gethostbyname");
997 goto bail;
998 }
999 imap_info("ok\n");
1000
1001 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1002
1003 s = socket(PF_INET, SOCK_STREAM, 0);
1004
1005 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1006 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1007 close(s);
1008 s = -1;
1009 perror("connect");
1010 }
1011 #endif
1012 if (s < 0) {
1013 fputs("Error: unable to connect to server.\n", stderr);
1014 goto bail;
1015 }
1016
1017 imap->buf.sock.fd[0] = s;
1018 imap->buf.sock.fd[1] = dup(s);
1019
1020 if (srvc->use_ssl &&
1021 ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1022 close(s);
1023 goto bail;
1024 }
1025 imap_info("ok\n");
1026 }
1027
1028 /* read the greeting string */
1029 if (buffer_gets(&imap->buf, &rsp)) {
1030 fprintf(stderr, "IMAP error: no greeting response\n");
1031 goto bail;
1032 }
1033 arg = next_arg(&rsp);
1034 if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1035 fprintf(stderr, "IMAP error: invalid greeting response\n");
1036 goto bail;
1037 }
1038 preauth = 0;
1039 if (!strcmp("PREAUTH", arg))
1040 preauth = 1;
1041 else if (strcmp("OK", arg) != 0) {
1042 fprintf(stderr, "IMAP error: unknown greeting response\n");
1043 goto bail;
1044 }
1045 parse_response_code(ctx, NULL, rsp);
1046 if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1047 goto bail;
1048
1049 if (!preauth) {
1050 #ifndef NO_OPENSSL
1051 if (!srvc->use_ssl && CAP(STARTTLS)) {
1052 if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1053 goto bail;
1054 if (ssl_socket_connect(&imap->buf.sock, 1,
1055 srvc->ssl_verify))
1056 goto bail;
1057 /* capabilities may have changed, so get the new capabilities */
1058 if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1059 goto bail;
1060 }
1061 #endif
1062 imap_info("Logging in...\n");
1063 if (!srvc->user || !srvc->pass) {
1064 cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1065 cred.host = xstrdup(srvc->host);
1066
1067 if (srvc->user)
1068 cred.username = xstrdup(srvc->user);
1069 if (srvc->pass)
1070 cred.password = xstrdup(srvc->pass);
1071
1072 credential_fill(&cred);
1073
1074 if (!srvc->user)
1075 srvc->user = xstrdup(cred.username);
1076 if (!srvc->pass)
1077 srvc->pass = xstrdup(cred.password);
1078 }
1079
1080 if (CAP(NOLOGIN)) {
1081 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1082 goto bail;
1083 }
1084
1085 if (srvc->auth_method) {
1086 struct imap_cmd_cb cb;
1087
1088 if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1089 if (!CAP(AUTH_CRAM_MD5)) {
1090 fprintf(stderr, "You specified"
1091 "CRAM-MD5 as authentication method, "
1092 "but %s doesn't support it.\n", srvc->host);
1093 goto bail;
1094 }
1095 /* CRAM-MD5 */
1096
1097 memset(&cb, 0, sizeof(cb));
1098 cb.cont = auth_cram_md5;
1099 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1100 fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1101 goto bail;
1102 }
1103 } else {
1104 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1105 goto bail;
1106 }
1107 } else {
1108 if (!imap->buf.sock.ssl)
1109 imap_warn("*** IMAP Warning *** Password is being "
1110 "sent in the clear\n");
1111 if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1112 fprintf(stderr, "IMAP error: LOGIN failed\n");
1113 goto bail;
1114 }
1115 }
1116 } /* !preauth */
1117
1118 if (cred.username)
1119 credential_approve(&cred);
1120 credential_clear(&cred);
1121
1122 /* check the target mailbox exists */
1123 ctx->name = folder;
1124 switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1125 case RESP_OK:
1126 /* ok */
1127 break;
1128 case RESP_BAD:
1129 fprintf(stderr, "IMAP error: could not check mailbox\n");
1130 goto out;
1131 case RESP_NO:
1132 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1133 imap_info("Created missing mailbox\n");
1134 } else {
1135 fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1136 goto out;
1137 }
1138 break;
1139 }
1140
1141 ctx->prefix = "";
1142 return ctx;
1143
1144 bail:
1145 if (cred.username)
1146 credential_reject(&cred);
1147 credential_clear(&cred);
1148
1149 out:
1150 imap_close_store(ctx);
1151 return NULL;
1152 }
1153
1154 /*
1155 * Insert CR characters as necessary in *msg to ensure that every LF
1156 * character in *msg is preceded by a CR.
1157 */
1158 static void lf_to_crlf(struct strbuf *msg)
1159 {
1160 char *new;
1161 size_t i, j;
1162 char lastc;
1163
1164 /* First pass: tally, in j, the size of the new string: */
1165 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1166 if (msg->buf[i] == '\n' && lastc != '\r')
1167 j++; /* a CR will need to be added here */
1168 lastc = msg->buf[i];
1169 j++;
1170 }
1171
1172 new = xmalloc(j + 1);
1173
1174 /*
1175 * Second pass: write the new string. Note that this loop is
1176 * otherwise identical to the first pass.
1177 */
1178 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1179 if (msg->buf[i] == '\n' && lastc != '\r')
1180 new[j++] = '\r';
1181 lastc = new[j++] = msg->buf[i];
1182 }
1183 strbuf_attach(msg, new, j, j + 1);
1184 }
1185
1186 /*
1187 * Store msg to IMAP. Also detach and free the data from msg->data,
1188 * leaving msg->data empty.
1189 */
1190 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1191 {
1192 struct imap *imap = ctx->imap;
1193 struct imap_cmd_cb cb;
1194 const char *prefix, *box;
1195 int ret;
1196
1197 lf_to_crlf(msg);
1198 memset(&cb, 0, sizeof(cb));
1199
1200 cb.dlen = msg->len;
1201 cb.data = strbuf_detach(msg, NULL);
1202
1203 box = ctx->name;
1204 prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1205 ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1206 imap->caps = imap->rcaps;
1207 if (ret != DRV_OK)
1208 return ret;
1209
1210 return DRV_OK;
1211 }
1212
1213 static void wrap_in_html(struct strbuf *msg)
1214 {
1215 struct strbuf buf = STRBUF_INIT;
1216 static char *content_type = "Content-Type: text/html;\n";
1217 static char *pre_open = "<pre>\n";
1218 static char *pre_close = "</pre>\n";
1219 const char *body = strstr(msg->buf, "\n\n");
1220
1221 if (!body)
1222 return; /* Headers but no body; no wrapping needed */
1223
1224 body += 2;
1225
1226 strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1227 strbuf_addstr(&buf, content_type);
1228 strbuf_addch(&buf, '\n');
1229 strbuf_addstr(&buf, pre_open);
1230 strbuf_addstr_xml_quoted(&buf, body);
1231 strbuf_addstr(&buf, pre_close);
1232
1233 strbuf_release(msg);
1234 *msg = buf;
1235 }
1236
1237 #define CHUNKSIZE 0x1000
1238
1239 static int read_message(FILE *f, struct strbuf *all_msgs)
1240 {
1241 do {
1242 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1243 break;
1244 } while (!feof(f));
1245
1246 return ferror(f) ? -1 : 0;
1247 }
1248
1249 static int count_messages(struct strbuf *all_msgs)
1250 {
1251 int count = 0;
1252 char *p = all_msgs->buf;
1253
1254 while (1) {
1255 if (starts_with(p, "From ")) {
1256 p = strstr(p+5, "\nFrom: ");
1257 if (!p) break;
1258 p = strstr(p+7, "\nDate: ");
1259 if (!p) break;
1260 p = strstr(p+7, "\nSubject: ");
1261 if (!p) break;
1262 p += 10;
1263 count++;
1264 }
1265 p = strstr(p+5, "\nFrom ");
1266 if (!p)
1267 break;
1268 p++;
1269 }
1270 return count;
1271 }
1272
1273 /*
1274 * Copy the next message from all_msgs, starting at offset *ofs, to
1275 * msg. Update *ofs to the start of the following message. Return
1276 * true iff a message was successfully copied.
1277 */
1278 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1279 {
1280 char *p, *data;
1281 size_t len;
1282
1283 if (*ofs >= all_msgs->len)
1284 return 0;
1285
1286 data = &all_msgs->buf[*ofs];
1287 len = all_msgs->len - *ofs;
1288
1289 if (len < 5 || !starts_with(data, "From "))
1290 return 0;
1291
1292 p = strchr(data, '\n');
1293 if (p) {
1294 p++;
1295 len -= p - data;
1296 *ofs += p - data;
1297 data = p;
1298 }
1299
1300 p = strstr(data, "\nFrom ");
1301 if (p)
1302 len = &p[1] - data;
1303
1304 strbuf_add(msg, data, len);
1305 *ofs += len;
1306 return 1;
1307 }
1308
1309 static char *imap_folder;
1310
1311 static void git_imap_config(void)
1312 {
1313 const char *val = NULL;
1314
1315 git_config_get_bool("imap.sslverify", &server.ssl_verify);
1316 git_config_get_bool("imap.preformattedhtml", &server.use_html);
1317 git_config_get_string("imap.folder", &imap_folder);
1318
1319 if (!git_config_get_value("imap.host", &val)) {
1320 if (!val) {
1321 git_die_config("imap.host", "Missing value for 'imap.host'");
1322 } else {
1323 if (starts_with(val, "imap:"))
1324 val += 5;
1325 else if (starts_with(val, "imaps:")) {
1326 val += 6;
1327 server.use_ssl = 1;
1328 }
1329 if (starts_with(val, "//"))
1330 val += 2;
1331 server.host = xstrdup(val);
1332 }
1333 }
1334
1335 git_config_get_string("imap.user", &server.user);
1336 git_config_get_string("imap.pass", &server.pass);
1337 git_config_get_int("imap.port", &server.port);
1338 git_config_get_string("imap.tunnel", &server.tunnel);
1339 git_config_get_string("imap.authmethod", &server.auth_method);
1340 }
1341
1342 int main(int argc, char **argv)
1343 {
1344 struct strbuf all_msgs = STRBUF_INIT;
1345 struct strbuf msg = STRBUF_INIT;
1346 struct imap_store *ctx = NULL;
1347 int ofs = 0;
1348 int r;
1349 int total, n = 0;
1350 int nongit_ok;
1351
1352 git_extract_argv0_path(argv[0]);
1353
1354 git_setup_gettext();
1355
1356 if (argc != 1)
1357 usage(imap_send_usage);
1358
1359 setup_git_directory_gently(&nongit_ok);
1360 git_imap_config();
1361
1362 if (!server.port)
1363 server.port = server.use_ssl ? 993 : 143;
1364
1365 if (!imap_folder) {
1366 fprintf(stderr, "no imap store specified\n");
1367 return 1;
1368 }
1369 if (!server.host) {
1370 if (!server.tunnel) {
1371 fprintf(stderr, "no imap host specified\n");
1372 return 1;
1373 }
1374 server.host = "tunnel";
1375 }
1376
1377 /* read the messages */
1378 if (read_message(stdin, &all_msgs)) {
1379 fprintf(stderr, "error reading input\n");
1380 return 1;
1381 }
1382
1383 if (all_msgs.len == 0) {
1384 fprintf(stderr, "nothing to send\n");
1385 return 1;
1386 }
1387
1388 total = count_messages(&all_msgs);
1389 if (!total) {
1390 fprintf(stderr, "no messages to send\n");
1391 return 1;
1392 }
1393
1394 /* write it to the imap server */
1395 ctx = imap_open_store(&server, imap_folder);
1396 if (!ctx) {
1397 fprintf(stderr, "failed to open store\n");
1398 return 1;
1399 }
1400
1401 fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1402 while (1) {
1403 unsigned percent = n * 100 / total;
1404
1405 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1406 if (!split_msg(&all_msgs, &msg, &ofs))
1407 break;
1408 if (server.use_html)
1409 wrap_in_html(&msg);
1410 r = imap_store_msg(ctx, &msg);
1411 if (r != DRV_OK)
1412 break;
1413 n++;
1414 }
1415 fprintf(stderr, "\n");
1416
1417 imap_close_store(ctx);
1418
1419 return 0;
1420 }
MinGW port of GIT