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Merge branch 'br/imap-send-verbosity'
[git/gitweb.git] / imap-send.c
blob7f9d30effd76acf179d8bd7d084edd2f3db7aa0c
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 #include "parse-options.h"
30 #ifdef NO_OPENSSL
31 typedef void *SSL;
32 #endif
33
34 static int verbosity;
35
36 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] < <mbox>", NULL };
37
38 static struct option imap_send_options[] = {
39 OPT__VERBOSITY(&verbosity),
40 OPT_END()
41 };
42
43 #undef DRV_OK
44 #define DRV_OK 0
45 #define DRV_MSG_BAD -1
46 #define DRV_BOX_BAD -2
47 #define DRV_STORE_BAD -3
48
49 __attribute__((format (printf, 1, 2)))
50 static void imap_info(const char *, ...);
51 __attribute__((format (printf, 1, 2)))
52 static void imap_warn(const char *, ...);
53
54 static char *next_arg(char **);
55
56 __attribute__((format (printf, 3, 4)))
57 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
58
59 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
60 {
61 int len;
62 char tmp[8192];
63
64 len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
65 if (len < 0)
66 die("Fatal: Out of memory");
67 if (len >= sizeof(tmp))
68 die("imap command overflow!");
69 *strp = xmemdupz(tmp, len);
70 return len;
71 }
72
73 struct imap_server_conf {
74 char *name;
75 char *tunnel;
76 char *host;
77 int port;
78 char *folder;
79 char *user;
80 char *pass;
81 int use_ssl;
82 int ssl_verify;
83 int use_html;
84 char *auth_method;
85 };
86
87 static struct imap_server_conf server = {
88 NULL, /* name */
89 NULL, /* tunnel */
90 NULL, /* host */
91 0, /* port */
92 NULL, /* folder */
93 NULL, /* user */
94 NULL, /* pass */
95 0, /* use_ssl */
96 1, /* ssl_verify */
97 0, /* use_html */
98 NULL, /* auth_method */
99 };
100
101 struct imap_socket {
102 int fd[2];
103 SSL *ssl;
104 };
105
106 struct imap_buffer {
107 struct imap_socket sock;
108 int bytes;
109 int offset;
110 char buf[1024];
111 };
112
113 struct imap_cmd;
114
115 struct imap {
116 int uidnext; /* from SELECT responses */
117 unsigned caps, rcaps; /* CAPABILITY results */
118 /* command queue */
119 int nexttag, num_in_progress, literal_pending;
120 struct imap_cmd *in_progress, **in_progress_append;
121 struct imap_buffer buf; /* this is BIG, so put it last */
122 };
123
124 struct imap_store {
125 /* currently open mailbox */
126 const char *name; /* foreign! maybe preset? */
127 int uidvalidity;
128 struct imap *imap;
129 const char *prefix;
130 };
131
132 struct imap_cmd_cb {
133 int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
134 void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
135 void *ctx;
136 char *data;
137 int dlen;
138 int uid;
139 };
140
141 struct imap_cmd {
142 struct imap_cmd *next;
143 struct imap_cmd_cb cb;
144 char *cmd;
145 int tag;
146 };
147
148 #define CAP(cap) (imap->caps & (1 << (cap)))
149
150 enum CAPABILITY {
151 NOLOGIN = 0,
152 UIDPLUS,
153 LITERALPLUS,
154 NAMESPACE,
155 STARTTLS,
156 AUTH_CRAM_MD5
157 };
158
159 static const char *cap_list[] = {
160 "LOGINDISABLED",
161 "UIDPLUS",
162 "LITERAL+",
163 "NAMESPACE",
164 "STARTTLS",
165 "AUTH=CRAM-MD5",
166 };
167
168 #define RESP_OK 0
169 #define RESP_NO 1
170 #define RESP_BAD 2
171
172 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
173
174
175 #ifndef NO_OPENSSL
176 static void ssl_socket_perror(const char *func)
177 {
178 fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
179 }
180 #endif
181
182 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
183 {
184 #ifndef NO_OPENSSL
185 if (sock->ssl) {
186 int sslerr = SSL_get_error(sock->ssl, ret);
187 switch (sslerr) {
188 case SSL_ERROR_NONE:
189 break;
190 case SSL_ERROR_SYSCALL:
191 perror("SSL_connect");
192 break;
193 default:
194 ssl_socket_perror("SSL_connect");
195 break;
196 }
197 } else
198 #endif
199 {
200 if (ret < 0)
201 perror(func);
202 else
203 fprintf(stderr, "%s: unexpected EOF\n", func);
204 }
205 }
206
207 #ifdef NO_OPENSSL
208 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
209 {
210 fprintf(stderr, "SSL requested but SSL support not compiled in\n");
211 return -1;
212 }
213
214 #else
215
216 static int host_matches(const char *host, const char *pattern)
217 {
218 if (pattern[0] == '*' && pattern[1] == '.') {
219 pattern += 2;
220 if (!(host = strchr(host, '.')))
221 return 0;
222 host++;
223 }
224
225 return *host && *pattern && !strcasecmp(host, pattern);
226 }
227
228 static int verify_hostname(X509 *cert, const char *hostname)
229 {
230 int len;
231 X509_NAME *subj;
232 char cname[1000];
233 int i, found;
234 STACK_OF(GENERAL_NAME) *subj_alt_names;
235
236 /* try the DNS subjectAltNames */
237 found = 0;
238 if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
239 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
240 for (i = 0; !found && i < num_subj_alt_names; i++) {
241 GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
242 if (subj_alt_name->type == GEN_DNS &&
243 strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
244 host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
245 found = 1;
246 }
247 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
248 }
249 if (found)
250 return 0;
251
252 /* try the common name */
253 if (!(subj = X509_get_subject_name(cert)))
254 return error("cannot get certificate subject");
255 if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
256 return error("cannot get certificate common name");
257 if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
258 return 0;
259 return error("certificate owner '%s' does not match hostname '%s'",
260 cname, hostname);
261 }
262
263 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
264 {
265 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
266 const SSL_METHOD *meth;
267 #else
268 SSL_METHOD *meth;
269 #endif
270 SSL_CTX *ctx;
271 int ret;
272 X509 *cert;
273
274 SSL_library_init();
275 SSL_load_error_strings();
276
277 if (use_tls_only)
278 meth = TLSv1_method();
279 else
280 meth = SSLv23_method();
281
282 if (!meth) {
283 ssl_socket_perror("SSLv23_method");
284 return -1;
285 }
286
287 ctx = SSL_CTX_new(meth);
288
289 if (verify)
290 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
291
292 if (!SSL_CTX_set_default_verify_paths(ctx)) {
293 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
294 return -1;
295 }
296 sock->ssl = SSL_new(ctx);
297 if (!sock->ssl) {
298 ssl_socket_perror("SSL_new");
299 return -1;
300 }
301 if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
302 ssl_socket_perror("SSL_set_rfd");
303 return -1;
304 }
305 if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
306 ssl_socket_perror("SSL_set_wfd");
307 return -1;
308 }
309
310 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
311 /*
312 * SNI (RFC4366)
313 * OpenSSL does not document this function, but the implementation
314 * returns 1 on success, 0 on failure after calling SSLerr().
315 */
316 ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
317 if (ret != 1)
318 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
319 #endif
320
321 ret = SSL_connect(sock->ssl);
322 if (ret <= 0) {
323 socket_perror("SSL_connect", sock, ret);
324 return -1;
325 }
326
327 if (verify) {
328 /* make sure the hostname matches that of the certificate */
329 cert = SSL_get_peer_certificate(sock->ssl);
330 if (!cert)
331 return error("unable to get peer certificate.");
332 if (verify_hostname(cert, server.host) < 0)
333 return -1;
334 }
335
336 return 0;
337 }
338 #endif
339
340 static int socket_read(struct imap_socket *sock, char *buf, int len)
341 {
342 ssize_t n;
343 #ifndef NO_OPENSSL
344 if (sock->ssl)
345 n = SSL_read(sock->ssl, buf, len);
346 else
347 #endif
348 n = xread(sock->fd[0], buf, len);
349 if (n <= 0) {
350 socket_perror("read", sock, n);
351 close(sock->fd[0]);
352 close(sock->fd[1]);
353 sock->fd[0] = sock->fd[1] = -1;
354 }
355 return n;
356 }
357
358 static int socket_write(struct imap_socket *sock, const char *buf, int len)
359 {
360 int n;
361 #ifndef NO_OPENSSL
362 if (sock->ssl)
363 n = SSL_write(sock->ssl, buf, len);
364 else
365 #endif
366 n = write_in_full(sock->fd[1], buf, len);
367 if (n != len) {
368 socket_perror("write", sock, n);
369 close(sock->fd[0]);
370 close(sock->fd[1]);
371 sock->fd[0] = sock->fd[1] = -1;
372 }
373 return n;
374 }
375
376 static void socket_shutdown(struct imap_socket *sock)
377 {
378 #ifndef NO_OPENSSL
379 if (sock->ssl) {
380 SSL_shutdown(sock->ssl);
381 SSL_free(sock->ssl);
382 }
383 #endif
384 close(sock->fd[0]);
385 close(sock->fd[1]);
386 }
387
388 /* simple line buffering */
389 static int buffer_gets(struct imap_buffer *b, char **s)
390 {
391 int n;
392 int start = b->offset;
393
394 *s = b->buf + start;
395
396 for (;;) {
397 /* make sure we have enough data to read the \r\n sequence */
398 if (b->offset + 1 >= b->bytes) {
399 if (start) {
400 /* shift down used bytes */
401 *s = b->buf;
402
403 assert(start <= b->bytes);
404 n = b->bytes - start;
405
406 if (n)
407 memmove(b->buf, b->buf + start, n);
408 b->offset -= start;
409 b->bytes = n;
410 start = 0;
411 }
412
413 n = socket_read(&b->sock, b->buf + b->bytes,
414 sizeof(b->buf) - b->bytes);
415
416 if (n <= 0)
417 return -1;
418
419 b->bytes += n;
420 }
421
422 if (b->buf[b->offset] == '\r') {
423 assert(b->offset + 1 < b->bytes);
424 if (b->buf[b->offset + 1] == '\n') {
425 b->buf[b->offset] = 0; /* terminate the string */
426 b->offset += 2; /* next line */
427 if (0 < verbosity)
428 puts(*s);
429 return 0;
430 }
431 }
432
433 b->offset++;
434 }
435 /* not reached */
436 }
437
438 static void imap_info(const char *msg, ...)
439 {
440 va_list va;
441
442 if (0 <= verbosity) {
443 va_start(va, msg);
444 vprintf(msg, va);
445 va_end(va);
446 fflush(stdout);
447 }
448 }
449
450 static void imap_warn(const char *msg, ...)
451 {
452 va_list va;
453
454 if (-2 < verbosity) {
455 va_start(va, msg);
456 vfprintf(stderr, msg, va);
457 va_end(va);
458 }
459 }
460
461 static char *next_arg(char **s)
462 {
463 char *ret;
464
465 if (!s || !*s)
466 return NULL;
467 while (isspace((unsigned char) **s))
468 (*s)++;
469 if (!**s) {
470 *s = NULL;
471 return NULL;
472 }
473 if (**s == '"') {
474 ++*s;
475 ret = *s;
476 *s = strchr(*s, '"');
477 } else {
478 ret = *s;
479 while (**s && !isspace((unsigned char) **s))
480 (*s)++;
481 }
482 if (*s) {
483 if (**s)
484 *(*s)++ = 0;
485 if (!**s)
486 *s = NULL;
487 }
488 return ret;
489 }
490
491 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
492 {
493 int ret;
494 va_list va;
495
496 va_start(va, fmt);
497 if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
498 die("Fatal: buffer too small. Please report a bug.");
499 va_end(va);
500 return ret;
501 }
502
503 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
504 struct imap_cmd_cb *cb,
505 const char *fmt, va_list ap)
506 {
507 struct imap *imap = ctx->imap;
508 struct imap_cmd *cmd;
509 int n, bufl;
510 char buf[1024];
511
512 cmd = xmalloc(sizeof(struct imap_cmd));
513 nfvasprintf(&cmd->cmd, fmt, ap);
514 cmd->tag = ++imap->nexttag;
515
516 if (cb)
517 cmd->cb = *cb;
518 else
519 memset(&cmd->cb, 0, sizeof(cmd->cb));
520
521 while (imap->literal_pending)
522 get_cmd_result(ctx, NULL);
523
524 if (!cmd->cb.data)
525 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
526 else
527 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
528 cmd->tag, cmd->cmd, cmd->cb.dlen,
529 CAP(LITERALPLUS) ? "+" : "");
530
531 if (0 < verbosity) {
532 if (imap->num_in_progress)
533 printf("(%d in progress) ", imap->num_in_progress);
534 if (!starts_with(cmd->cmd, "LOGIN"))
535 printf(">>> %s", buf);
536 else
537 printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
538 }
539 if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
540 free(cmd->cmd);
541 free(cmd);
542 if (cb)
543 free(cb->data);
544 return NULL;
545 }
546 if (cmd->cb.data) {
547 if (CAP(LITERALPLUS)) {
548 n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
549 free(cmd->cb.data);
550 if (n != cmd->cb.dlen ||
551 socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
552 free(cmd->cmd);
553 free(cmd);
554 return NULL;
555 }
556 cmd->cb.data = NULL;
557 } else
558 imap->literal_pending = 1;
559 } else if (cmd->cb.cont)
560 imap->literal_pending = 1;
561 cmd->next = NULL;
562 *imap->in_progress_append = cmd;
563 imap->in_progress_append = &cmd->next;
564 imap->num_in_progress++;
565 return cmd;
566 }
567
568 __attribute__((format (printf, 3, 4)))
569 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
570 const char *fmt, ...)
571 {
572 va_list ap;
573 struct imap_cmd *cmdp;
574
575 va_start(ap, fmt);
576 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
577 va_end(ap);
578 if (!cmdp)
579 return RESP_BAD;
580
581 return get_cmd_result(ctx, cmdp);
582 }
583
584 __attribute__((format (printf, 3, 4)))
585 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
586 const char *fmt, ...)
587 {
588 va_list ap;
589 struct imap_cmd *cmdp;
590
591 va_start(ap, fmt);
592 cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
593 va_end(ap);
594 if (!cmdp)
595 return DRV_STORE_BAD;
596
597 switch (get_cmd_result(ctx, cmdp)) {
598 case RESP_BAD: return DRV_STORE_BAD;
599 case RESP_NO: return DRV_MSG_BAD;
600 default: return DRV_OK;
601 }
602 }
603
604 static int skip_imap_list_l(char **sp, int level)
605 {
606 char *s = *sp;
607
608 for (;;) {
609 while (isspace((unsigned char)*s))
610 s++;
611 if (level && *s == ')') {
612 s++;
613 break;
614 }
615 if (*s == '(') {
616 /* sublist */
617 s++;
618 if (skip_imap_list_l(&s, level + 1))
619 goto bail;
620 } else if (*s == '"') {
621 /* quoted string */
622 s++;
623 for (; *s != '"'; s++)
624 if (!*s)
625 goto bail;
626 s++;
627 } else {
628 /* atom */
629 for (; *s && !isspace((unsigned char)*s); s++)
630 if (level && *s == ')')
631 break;
632 }
633
634 if (!level)
635 break;
636 if (!*s)
637 goto bail;
638 }
639 *sp = s;
640 return 0;
641
642 bail:
643 return -1;
644 }
645
646 static void skip_list(char **sp)
647 {
648 skip_imap_list_l(sp, 0);
649 }
650
651 static void parse_capability(struct imap *imap, char *cmd)
652 {
653 char *arg;
654 unsigned i;
655
656 imap->caps = 0x80000000;
657 while ((arg = next_arg(&cmd)))
658 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
659 if (!strcmp(cap_list[i], arg))
660 imap->caps |= 1 << i;
661 imap->rcaps = imap->caps;
662 }
663
664 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
665 char *s)
666 {
667 struct imap *imap = ctx->imap;
668 char *arg, *p;
669
670 if (*s != '[')
671 return RESP_OK; /* no response code */
672 s++;
673 if (!(p = strchr(s, ']'))) {
674 fprintf(stderr, "IMAP error: malformed response code\n");
675 return RESP_BAD;
676 }
677 *p++ = 0;
678 arg = next_arg(&s);
679 if (!strcmp("UIDVALIDITY", arg)) {
680 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
681 fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
682 return RESP_BAD;
683 }
684 } else if (!strcmp("UIDNEXT", arg)) {
685 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
686 fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
687 return RESP_BAD;
688 }
689 } else if (!strcmp("CAPABILITY", arg)) {
690 parse_capability(imap, s);
691 } else if (!strcmp("ALERT", arg)) {
692 /* RFC2060 says that these messages MUST be displayed
693 * to the user
694 */
695 for (; isspace((unsigned char)*p); p++);
696 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
697 } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
698 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
699 !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
700 fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
701 return RESP_BAD;
702 }
703 }
704 return RESP_OK;
705 }
706
707 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
708 {
709 struct imap *imap = ctx->imap;
710 struct imap_cmd *cmdp, **pcmdp;
711 char *cmd, *arg, *arg1;
712 int n, resp, resp2, tag;
713
714 for (;;) {
715 if (buffer_gets(&imap->buf, &cmd))
716 return RESP_BAD;
717
718 arg = next_arg(&cmd);
719 if (*arg == '*') {
720 arg = next_arg(&cmd);
721 if (!arg) {
722 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
723 return RESP_BAD;
724 }
725
726 if (!strcmp("NAMESPACE", arg)) {
727 /* rfc2342 NAMESPACE response. */
728 skip_list(&cmd); /* Personal mailboxes */
729 skip_list(&cmd); /* Others' mailboxes */
730 skip_list(&cmd); /* Shared mailboxes */
731 } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
732 !strcmp("NO", arg) || !strcmp("BYE", arg)) {
733 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
734 return resp;
735 } else if (!strcmp("CAPABILITY", arg)) {
736 parse_capability(imap, cmd);
737 } else if ((arg1 = next_arg(&cmd))) {
738 ; /*
739 * Unhandled response-data with at least two words.
740 * Ignore it.
741 *
742 * NEEDSWORK: Previously this case handled '<num> EXISTS'
743 * and '<num> RECENT' but as a probably-unintended side
744 * effect it ignores other unrecognized two-word
745 * responses. imap-send doesn't ever try to read
746 * messages or mailboxes these days, so consider
747 * eliminating this case.
748 */
749 } else {
750 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
751 return RESP_BAD;
752 }
753 } else if (!imap->in_progress) {
754 fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
755 return RESP_BAD;
756 } else if (*arg == '+') {
757 /* This can happen only with the last command underway, as
758 it enforces a round-trip. */
759 cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
760 offsetof(struct imap_cmd, next));
761 if (cmdp->cb.data) {
762 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
763 free(cmdp->cb.data);
764 cmdp->cb.data = NULL;
765 if (n != (int)cmdp->cb.dlen)
766 return RESP_BAD;
767 } else if (cmdp->cb.cont) {
768 if (cmdp->cb.cont(ctx, cmdp, cmd))
769 return RESP_BAD;
770 } else {
771 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
772 return RESP_BAD;
773 }
774 if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
775 return RESP_BAD;
776 if (!cmdp->cb.cont)
777 imap->literal_pending = 0;
778 if (!tcmd)
779 return DRV_OK;
780 } else {
781 tag = atoi(arg);
782 for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
783 if (cmdp->tag == tag)
784 goto gottag;
785 fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
786 return RESP_BAD;
787 gottag:
788 if (!(*pcmdp = cmdp->next))
789 imap->in_progress_append = pcmdp;
790 imap->num_in_progress--;
791 if (cmdp->cb.cont || cmdp->cb.data)
792 imap->literal_pending = 0;
793 arg = next_arg(&cmd);
794 if (!strcmp("OK", arg))
795 resp = DRV_OK;
796 else {
797 if (!strcmp("NO", arg))
798 resp = RESP_NO;
799 else /*if (!strcmp("BAD", arg))*/
800 resp = RESP_BAD;
801 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
802 !starts_with(cmdp->cmd, "LOGIN") ?
803 cmdp->cmd : "LOGIN <user> <pass>",
804 arg, cmd ? cmd : "");
805 }
806 if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
807 resp = resp2;
808 if (cmdp->cb.done)
809 cmdp->cb.done(ctx, cmdp, resp);
810 free(cmdp->cb.data);
811 free(cmdp->cmd);
812 free(cmdp);
813 if (!tcmd || tcmd == cmdp)
814 return resp;
815 }
816 }
817 /* not reached */
818 }
819
820 static void imap_close_server(struct imap_store *ictx)
821 {
822 struct imap *imap = ictx->imap;
823
824 if (imap->buf.sock.fd[0] != -1) {
825 imap_exec(ictx, NULL, "LOGOUT");
826 socket_shutdown(&imap->buf.sock);
827 }
828 free(imap);
829 }
830
831 static void imap_close_store(struct imap_store *ctx)
832 {
833 imap_close_server(ctx);
834 free(ctx);
835 }
836
837 #ifndef NO_OPENSSL
838
839 /*
840 * hexchar() and cram() functions are based on the code from the isync
841 * project (http://isync.sf.net/).
842 */
843 static char hexchar(unsigned int b)
844 {
845 return b < 10 ? '0' + b : 'a' + (b - 10);
846 }
847
848 #define ENCODED_SIZE(n) (4*((n+2)/3))
849 static char *cram(const char *challenge_64, const char *user, const char *pass)
850 {
851 int i, resp_len, encoded_len, decoded_len;
852 HMAC_CTX hmac;
853 unsigned char hash[16];
854 char hex[33];
855 char *response, *response_64, *challenge;
856
857 /*
858 * length of challenge_64 (i.e. base-64 encoded string) is a good
859 * enough upper bound for challenge (decoded result).
860 */
861 encoded_len = strlen(challenge_64);
862 challenge = xmalloc(encoded_len);
863 decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
864 (unsigned char *)challenge_64, encoded_len);
865 if (decoded_len < 0)
866 die("invalid challenge %s", challenge_64);
867 HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
868 HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
869 HMAC_Final(&hmac, hash, NULL);
870 HMAC_CTX_cleanup(&hmac);
871
872 hex[32] = 0;
873 for (i = 0; i < 16; i++) {
874 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
875 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
876 }
877
878 /* response: "<user> <digest in hex>" */
879 resp_len = strlen(user) + 1 + strlen(hex) + 1;
880 response = xmalloc(resp_len);
881 sprintf(response, "%s %s", user, hex);
882
883 response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
884 encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
885 (unsigned char *)response, resp_len);
886 if (encoded_len < 0)
887 die("EVP_EncodeBlock error");
888 response_64[encoded_len] = '\0';
889 return (char *)response_64;
890 }
891
892 #else
893
894 static char *cram(const char *challenge_64, const char *user, const char *pass)
895 {
896 die("If you want to use CRAM-MD5 authenticate method, "
897 "you have to build git-imap-send with OpenSSL library.");
898 }
899
900 #endif
901
902 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
903 {
904 int ret;
905 char *response;
906
907 response = cram(prompt, server.user, server.pass);
908
909 ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
910 if (ret != strlen(response))
911 return error("IMAP error: sending response failed");
912
913 free(response);
914
915 return 0;
916 }
917
918 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
919 {
920 struct credential cred = CREDENTIAL_INIT;
921 struct imap_store *ctx;
922 struct imap *imap;
923 char *arg, *rsp;
924 int s = -1, preauth;
925
926 ctx = xcalloc(1, sizeof(*ctx));
927
928 ctx->imap = imap = xcalloc(1, sizeof(*imap));
929 imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
930 imap->in_progress_append = &imap->in_progress;
931
932 /* open connection to IMAP server */
933
934 if (srvc->tunnel) {
935 struct child_process tunnel = CHILD_PROCESS_INIT;
936
937 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
938
939 argv_array_push(&tunnel.args, srvc->tunnel);
940 tunnel.use_shell = 1;
941 tunnel.in = -1;
942 tunnel.out = -1;
943 if (start_command(&tunnel))
944 die("cannot start proxy %s", srvc->tunnel);
945
946 imap->buf.sock.fd[0] = tunnel.out;
947 imap->buf.sock.fd[1] = tunnel.in;
948
949 imap_info("ok\n");
950 } else {
951 #ifndef NO_IPV6
952 struct addrinfo hints, *ai0, *ai;
953 int gai;
954 char portstr[6];
955
956 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
957
958 memset(&hints, 0, sizeof(hints));
959 hints.ai_socktype = SOCK_STREAM;
960 hints.ai_protocol = IPPROTO_TCP;
961
962 imap_info("Resolving %s... ", srvc->host);
963 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
964 if (gai) {
965 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
966 goto bail;
967 }
968 imap_info("ok\n");
969
970 for (ai0 = ai; ai; ai = ai->ai_next) {
971 char addr[NI_MAXHOST];
972
973 s = socket(ai->ai_family, ai->ai_socktype,
974 ai->ai_protocol);
975 if (s < 0)
976 continue;
977
978 getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
979 sizeof(addr), NULL, 0, NI_NUMERICHOST);
980 imap_info("Connecting to [%s]:%s... ", addr, portstr);
981
982 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
983 close(s);
984 s = -1;
985 perror("connect");
986 continue;
987 }
988
989 break;
990 }
991 freeaddrinfo(ai0);
992 #else /* NO_IPV6 */
993 struct hostent *he;
994 struct sockaddr_in addr;
995
996 memset(&addr, 0, sizeof(addr));
997 addr.sin_port = htons(srvc->port);
998 addr.sin_family = AF_INET;
999
1000 imap_info("Resolving %s... ", srvc->host);
1001 he = gethostbyname(srvc->host);
1002 if (!he) {
1003 perror("gethostbyname");
1004 goto bail;
1005 }
1006 imap_info("ok\n");
1007
1008 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1009
1010 s = socket(PF_INET, SOCK_STREAM, 0);
1011
1012 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1013 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1014 close(s);
1015 s = -1;
1016 perror("connect");
1017 }
1018 #endif
1019 if (s < 0) {
1020 fputs("Error: unable to connect to server.\n", stderr);
1021 goto bail;
1022 }
1023
1024 imap->buf.sock.fd[0] = s;
1025 imap->buf.sock.fd[1] = dup(s);
1026
1027 if (srvc->use_ssl &&
1028 ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1029 close(s);
1030 goto bail;
1031 }
1032 imap_info("ok\n");
1033 }
1034
1035 /* read the greeting string */
1036 if (buffer_gets(&imap->buf, &rsp)) {
1037 fprintf(stderr, "IMAP error: no greeting response\n");
1038 goto bail;
1039 }
1040 arg = next_arg(&rsp);
1041 if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1042 fprintf(stderr, "IMAP error: invalid greeting response\n");
1043 goto bail;
1044 }
1045 preauth = 0;
1046 if (!strcmp("PREAUTH", arg))
1047 preauth = 1;
1048 else if (strcmp("OK", arg) != 0) {
1049 fprintf(stderr, "IMAP error: unknown greeting response\n");
1050 goto bail;
1051 }
1052 parse_response_code(ctx, NULL, rsp);
1053 if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1054 goto bail;
1055
1056 if (!preauth) {
1057 #ifndef NO_OPENSSL
1058 if (!srvc->use_ssl && CAP(STARTTLS)) {
1059 if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1060 goto bail;
1061 if (ssl_socket_connect(&imap->buf.sock, 1,
1062 srvc->ssl_verify))
1063 goto bail;
1064 /* capabilities may have changed, so get the new capabilities */
1065 if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1066 goto bail;
1067 }
1068 #endif
1069 imap_info("Logging in...\n");
1070 if (!srvc->user || !srvc->pass) {
1071 cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1072 cred.host = xstrdup(srvc->host);
1073
1074 if (srvc->user)
1075 cred.username = xstrdup(srvc->user);
1076 if (srvc->pass)
1077 cred.password = xstrdup(srvc->pass);
1078
1079 credential_fill(&cred);
1080
1081 if (!srvc->user)
1082 srvc->user = xstrdup(cred.username);
1083 if (!srvc->pass)
1084 srvc->pass = xstrdup(cred.password);
1085 }
1086
1087 if (CAP(NOLOGIN)) {
1088 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1089 goto bail;
1090 }
1091
1092 if (srvc->auth_method) {
1093 struct imap_cmd_cb cb;
1094
1095 if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1096 if (!CAP(AUTH_CRAM_MD5)) {
1097 fprintf(stderr, "You specified"
1098 "CRAM-MD5 as authentication method, "
1099 "but %s doesn't support it.\n", srvc->host);
1100 goto bail;
1101 }
1102 /* CRAM-MD5 */
1103
1104 memset(&cb, 0, sizeof(cb));
1105 cb.cont = auth_cram_md5;
1106 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1107 fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1108 goto bail;
1109 }
1110 } else {
1111 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1112 goto bail;
1113 }
1114 } else {
1115 if (!imap->buf.sock.ssl)
1116 imap_warn("*** IMAP Warning *** Password is being "
1117 "sent in the clear\n");
1118 if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1119 fprintf(stderr, "IMAP error: LOGIN failed\n");
1120 goto bail;
1121 }
1122 }
1123 } /* !preauth */
1124
1125 if (cred.username)
1126 credential_approve(&cred);
1127 credential_clear(&cred);
1128
1129 /* check the target mailbox exists */
1130 ctx->name = folder;
1131 switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1132 case RESP_OK:
1133 /* ok */
1134 break;
1135 case RESP_BAD:
1136 fprintf(stderr, "IMAP error: could not check mailbox\n");
1137 goto out;
1138 case RESP_NO:
1139 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1140 imap_info("Created missing mailbox\n");
1141 } else {
1142 fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1143 goto out;
1144 }
1145 break;
1146 }
1147
1148 ctx->prefix = "";
1149 return ctx;
1150
1151 bail:
1152 if (cred.username)
1153 credential_reject(&cred);
1154 credential_clear(&cred);
1155
1156 out:
1157 imap_close_store(ctx);
1158 return NULL;
1159 }
1160
1161 /*
1162 * Insert CR characters as necessary in *msg to ensure that every LF
1163 * character in *msg is preceded by a CR.
1164 */
1165 static void lf_to_crlf(struct strbuf *msg)
1166 {
1167 char *new;
1168 size_t i, j;
1169 char lastc;
1170
1171 /* First pass: tally, in j, the size of the new string: */
1172 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1173 if (msg->buf[i] == '\n' && lastc != '\r')
1174 j++; /* a CR will need to be added here */
1175 lastc = msg->buf[i];
1176 j++;
1177 }
1178
1179 new = xmalloc(j + 1);
1180
1181 /*
1182 * Second pass: write the new string. Note that this loop is
1183 * otherwise identical to the first pass.
1184 */
1185 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1186 if (msg->buf[i] == '\n' && lastc != '\r')
1187 new[j++] = '\r';
1188 lastc = new[j++] = msg->buf[i];
1189 }
1190 strbuf_attach(msg, new, j, j + 1);
1191 }
1192
1193 /*
1194 * Store msg to IMAP. Also detach and free the data from msg->data,
1195 * leaving msg->data empty.
1196 */
1197 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1198 {
1199 struct imap *imap = ctx->imap;
1200 struct imap_cmd_cb cb;
1201 const char *prefix, *box;
1202 int ret;
1203
1204 lf_to_crlf(msg);
1205 memset(&cb, 0, sizeof(cb));
1206
1207 cb.dlen = msg->len;
1208 cb.data = strbuf_detach(msg, NULL);
1209
1210 box = ctx->name;
1211 prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1212 ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1213 imap->caps = imap->rcaps;
1214 if (ret != DRV_OK)
1215 return ret;
1216
1217 return DRV_OK;
1218 }
1219
1220 static void wrap_in_html(struct strbuf *msg)
1221 {
1222 struct strbuf buf = STRBUF_INIT;
1223 static char *content_type = "Content-Type: text/html;\n";
1224 static char *pre_open = "<pre>\n";
1225 static char *pre_close = "</pre>\n";
1226 const char *body = strstr(msg->buf, "\n\n");
1227
1228 if (!body)
1229 return; /* Headers but no body; no wrapping needed */
1230
1231 body += 2;
1232
1233 strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1234 strbuf_addstr(&buf, content_type);
1235 strbuf_addch(&buf, '\n');
1236 strbuf_addstr(&buf, pre_open);
1237 strbuf_addstr_xml_quoted(&buf, body);
1238 strbuf_addstr(&buf, pre_close);
1239
1240 strbuf_release(msg);
1241 *msg = buf;
1242 }
1243
1244 #define CHUNKSIZE 0x1000
1245
1246 static int read_message(FILE *f, struct strbuf *all_msgs)
1247 {
1248 do {
1249 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1250 break;
1251 } while (!feof(f));
1252
1253 return ferror(f) ? -1 : 0;
1254 }
1255
1256 static int count_messages(struct strbuf *all_msgs)
1257 {
1258 int count = 0;
1259 char *p = all_msgs->buf;
1260
1261 while (1) {
1262 if (starts_with(p, "From ")) {
1263 p = strstr(p+5, "\nFrom: ");
1264 if (!p) break;
1265 p = strstr(p+7, "\nDate: ");
1266 if (!p) break;
1267 p = strstr(p+7, "\nSubject: ");
1268 if (!p) break;
1269 p += 10;
1270 count++;
1271 }
1272 p = strstr(p+5, "\nFrom ");
1273 if (!p)
1274 break;
1275 p++;
1276 }
1277 return count;
1278 }
1279
1280 /*
1281 * Copy the next message from all_msgs, starting at offset *ofs, to
1282 * msg. Update *ofs to the start of the following message. Return
1283 * true iff a message was successfully copied.
1284 */
1285 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1286 {
1287 char *p, *data;
1288 size_t len;
1289
1290 if (*ofs >= all_msgs->len)
1291 return 0;
1292
1293 data = &all_msgs->buf[*ofs];
1294 len = all_msgs->len - *ofs;
1295
1296 if (len < 5 || !starts_with(data, "From "))
1297 return 0;
1298
1299 p = strchr(data, '\n');
1300 if (p) {
1301 p++;
1302 len -= p - data;
1303 *ofs += p - data;
1304 data = p;
1305 }
1306
1307 p = strstr(data, "\nFrom ");
1308 if (p)
1309 len = &p[1] - data;
1310
1311 strbuf_add(msg, data, len);
1312 *ofs += len;
1313 return 1;
1314 }
1315
1316 static void git_imap_config(void)
1317 {
1318 const char *val = NULL;
1319
1320 git_config_get_bool("imap.sslverify", &server.ssl_verify);
1321 git_config_get_bool("imap.preformattedhtml", &server.use_html);
1322 git_config_get_string("imap.folder", &server.folder);
1323
1324 if (!git_config_get_value("imap.host", &val)) {
1325 if (!val) {
1326 git_die_config("imap.host", "Missing value for 'imap.host'");
1327 } else {
1328 if (starts_with(val, "imap:"))
1329 val += 5;
1330 else if (starts_with(val, "imaps:")) {
1331 val += 6;
1332 server.use_ssl = 1;
1333 }
1334 if (starts_with(val, "//"))
1335 val += 2;
1336 server.host = xstrdup(val);
1337 }
1338 }
1339
1340 git_config_get_string("imap.user", &server.user);
1341 git_config_get_string("imap.pass", &server.pass);
1342 git_config_get_int("imap.port", &server.port);
1343 git_config_get_string("imap.tunnel", &server.tunnel);
1344 git_config_get_string("imap.authmethod", &server.auth_method);
1345 }
1346
1347 int main(int argc, char **argv)
1348 {
1349 struct strbuf all_msgs = STRBUF_INIT;
1350 struct strbuf msg = STRBUF_INIT;
1351 struct imap_store *ctx = NULL;
1352 int ofs = 0;
1353 int r;
1354 int total, n = 0;
1355 int nongit_ok;
1356
1357 git_extract_argv0_path(argv[0]);
1358
1359 git_setup_gettext();
1360
1361 setup_git_directory_gently(&nongit_ok);
1362 git_imap_config();
1363
1364 argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1365
1366 if (argc)
1367 usage_with_options(imap_send_usage, imap_send_options);
1368
1369 if (!server.port)
1370 server.port = server.use_ssl ? 993 : 143;
1371
1372 if (!server.folder) {
1373 fprintf(stderr, "no imap store specified\n");
1374 return 1;
1375 }
1376 if (!server.host) {
1377 if (!server.tunnel) {
1378 fprintf(stderr, "no imap host specified\n");
1379 return 1;
1380 }
1381 server.host = "tunnel";
1382 }
1383
1384 /* read the messages */
1385 if (read_message(stdin, &all_msgs)) {
1386 fprintf(stderr, "error reading input\n");
1387 return 1;
1388 }
1389
1390 if (all_msgs.len == 0) {
1391 fprintf(stderr, "nothing to send\n");
1392 return 1;
1393 }
1394
1395 total = count_messages(&all_msgs);
1396 if (!total) {
1397 fprintf(stderr, "no messages to send\n");
1398 return 1;
1399 }
1400
1401 /* write it to the imap server */
1402 ctx = imap_open_store(&server, server.folder);
1403 if (!ctx) {
1404 fprintf(stderr, "failed to open store\n");
1405 return 1;
1406 }
1407
1408 fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1409 while (1) {
1410 unsigned percent = n * 100 / total;
1411
1412 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1413 if (!split_msg(&all_msgs, &msg, &ofs))
1414 break;
1415 if (server.use_html)
1416 wrap_in_html(&msg);
1417 r = imap_store_msg(ctx, &msg);
1418 if (r != DRV_OK)
1419 break;
1420 n++;
1421 }
1422 fprintf(stderr, "\n");
1423
1424 imap_close_store(ctx);
1425
1426 return 0;
1427 }
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