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git-remote-mediawiki: rewrite unclear line of instructions
[git.git] / imap-send.c
blobd6b65e204c6009e5c30f358810198319b70eda25
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 "exec_cmd.h"
27 #include "run-command.h"
28 #include "prompt.h"
29 #ifdef NO_OPENSSL
30 typedef void *SSL;
31 #else
32 #ifdef APPLE_COMMON_CRYPTO
33 #include <CommonCrypto/CommonHMAC.h>
34 #define HMAC_CTX CCHmacContext
35 #define HMAC_Init(hmac, key, len, algo) CCHmacInit(hmac, algo, key, len)
36 #define HMAC_Update CCHmacUpdate
37 #define HMAC_Final(hmac, hash, ptr) CCHmacFinal(hmac, hash)
38 #define HMAC_CTX_cleanup(ignore)
39 #define EVP_md5() kCCHmacAlgMD5
40 #else
41 #include <openssl/evp.h>
42 #include <openssl/hmac.h>
43 #endif
44 #include <openssl/x509v3.h>
45 #endif
46
47 static const char imap_send_usage[] = "git imap-send < <mbox>";
48
49 #undef DRV_OK
50 #define DRV_OK 0
51 #define DRV_MSG_BAD -1
52 #define DRV_BOX_BAD -2
53 #define DRV_STORE_BAD -3
54
55 static int Verbose, Quiet;
56
57 __attribute__((format (printf, 1, 2)))
58 static void imap_info(const char *, ...);
59 __attribute__((format (printf, 1, 2)))
60 static void imap_warn(const char *, ...);
61
62 static char *next_arg(char **);
63
64 __attribute__((format (printf, 3, 4)))
65 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
66
67 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
68 {
69 int len;
70 char tmp[8192];
71
72 len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
73 if (len < 0)
74 die("Fatal: Out of memory");
75 if (len >= sizeof(tmp))
76 die("imap command overflow!");
77 *strp = xmemdupz(tmp, len);
78 return len;
79 }
80
81 struct imap_server_conf {
82 char *name;
83 char *tunnel;
84 char *host;
85 int port;
86 char *user;
87 char *pass;
88 int use_ssl;
89 int ssl_verify;
90 int use_html;
91 char *auth_method;
92 };
93
94 static struct imap_server_conf server = {
95 NULL, /* name */
96 NULL, /* tunnel */
97 NULL, /* host */
98 0, /* port */
99 NULL, /* user */
100 NULL, /* pass */
101 0, /* use_ssl */
102 1, /* ssl_verify */
103 0, /* use_html */
104 NULL, /* auth_method */
105 };
106
107 struct imap_socket {
108 int fd[2];
109 SSL *ssl;
110 };
111
112 struct imap_buffer {
113 struct imap_socket sock;
114 int bytes;
115 int offset;
116 char buf[1024];
117 };
118
119 struct imap_cmd;
120
121 struct imap {
122 int uidnext; /* from SELECT responses */
123 unsigned caps, rcaps; /* CAPABILITY results */
124 /* command queue */
125 int nexttag, num_in_progress, literal_pending;
126 struct imap_cmd *in_progress, **in_progress_append;
127 struct imap_buffer buf; /* this is BIG, so put it last */
128 };
129
130 struct imap_store {
131 /* currently open mailbox */
132 const char *name; /* foreign! maybe preset? */
133 int uidvalidity;
134 struct imap *imap;
135 const char *prefix;
136 };
137
138 struct imap_cmd_cb {
139 int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
140 void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
141 void *ctx;
142 char *data;
143 int dlen;
144 int uid;
145 unsigned create:1, trycreate:1;
146 };
147
148 struct imap_cmd {
149 struct imap_cmd *next;
150 struct imap_cmd_cb cb;
151 char *cmd;
152 int tag;
153 };
154
155 #define CAP(cap) (imap->caps & (1 << (cap)))
156
157 enum CAPABILITY {
158 NOLOGIN = 0,
159 UIDPLUS,
160 LITERALPLUS,
161 NAMESPACE,
162 STARTTLS,
163 AUTH_CRAM_MD5
164 };
165
166 static const char *cap_list[] = {
167 "LOGINDISABLED",
168 "UIDPLUS",
169 "LITERAL+",
170 "NAMESPACE",
171 "STARTTLS",
172 "AUTH=CRAM-MD5",
173 };
174
175 #define RESP_OK 0
176 #define RESP_NO 1
177 #define RESP_BAD 2
178
179 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
180
181
182 #ifndef NO_OPENSSL
183 static void ssl_socket_perror(const char *func)
184 {
185 fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
186 }
187 #endif
188
189 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
190 {
191 #ifndef NO_OPENSSL
192 if (sock->ssl) {
193 int sslerr = SSL_get_error(sock->ssl, ret);
194 switch (sslerr) {
195 case SSL_ERROR_NONE:
196 break;
197 case SSL_ERROR_SYSCALL:
198 perror("SSL_connect");
199 break;
200 default:
201 ssl_socket_perror("SSL_connect");
202 break;
203 }
204 } else
205 #endif
206 {
207 if (ret < 0)
208 perror(func);
209 else
210 fprintf(stderr, "%s: unexpected EOF\n", func);
211 }
212 }
213
214 #ifdef NO_OPENSSL
215 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
216 {
217 fprintf(stderr, "SSL requested but SSL support not compiled in\n");
218 return -1;
219 }
220
221 #else
222
223 static int host_matches(const char *host, const char *pattern)
224 {
225 if (pattern[0] == '*' && pattern[1] == '.') {
226 pattern += 2;
227 if (!(host = strchr(host, '.')))
228 return 0;
229 host++;
230 }
231
232 return *host && *pattern && !strcasecmp(host, pattern);
233 }
234
235 static int verify_hostname(X509 *cert, const char *hostname)
236 {
237 int len;
238 X509_NAME *subj;
239 char cname[1000];
240 int i, found;
241 STACK_OF(GENERAL_NAME) *subj_alt_names;
242
243 /* try the DNS subjectAltNames */
244 found = 0;
245 if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
246 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
247 for (i = 0; !found && i < num_subj_alt_names; i++) {
248 GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
249 if (subj_alt_name->type == GEN_DNS &&
250 strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
251 host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
252 found = 1;
253 }
254 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
255 }
256 if (found)
257 return 0;
258
259 /* try the common name */
260 if (!(subj = X509_get_subject_name(cert)))
261 return error("cannot get certificate subject");
262 if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
263 return error("cannot get certificate common name");
264 if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
265 return 0;
266 return error("certificate owner '%s' does not match hostname '%s'",
267 cname, hostname);
268 }
269
270 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
271 {
272 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
273 const SSL_METHOD *meth;
274 #else
275 SSL_METHOD *meth;
276 #endif
277 SSL_CTX *ctx;
278 int ret;
279 X509 *cert;
280
281 SSL_library_init();
282 SSL_load_error_strings();
283
284 if (use_tls_only)
285 meth = TLSv1_method();
286 else
287 meth = SSLv23_method();
288
289 if (!meth) {
290 ssl_socket_perror("SSLv23_method");
291 return -1;
292 }
293
294 ctx = SSL_CTX_new(meth);
295
296 if (verify)
297 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
298
299 if (!SSL_CTX_set_default_verify_paths(ctx)) {
300 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
301 return -1;
302 }
303 sock->ssl = SSL_new(ctx);
304 if (!sock->ssl) {
305 ssl_socket_perror("SSL_new");
306 return -1;
307 }
308 if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
309 ssl_socket_perror("SSL_set_rfd");
310 return -1;
311 }
312 if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
313 ssl_socket_perror("SSL_set_wfd");
314 return -1;
315 }
316
317 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
318 /*
319 * SNI (RFC4366)
320 * OpenSSL does not document this function, but the implementation
321 * returns 1 on success, 0 on failure after calling SSLerr().
322 */
323 ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
324 if (ret != 1)
325 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
326 #endif
327
328 ret = SSL_connect(sock->ssl);
329 if (ret <= 0) {
330 socket_perror("SSL_connect", sock, ret);
331 return -1;
332 }
333
334 if (verify) {
335 /* make sure the hostname matches that of the certificate */
336 cert = SSL_get_peer_certificate(sock->ssl);
337 if (!cert)
338 return error("unable to get peer certificate.");
339 if (verify_hostname(cert, server.host) < 0)
340 return -1;
341 }
342
343 return 0;
344 }
345 #endif
346
347 static int socket_read(struct imap_socket *sock, char *buf, int len)
348 {
349 ssize_t n;
350 #ifndef NO_OPENSSL
351 if (sock->ssl)
352 n = SSL_read(sock->ssl, buf, len);
353 else
354 #endif
355 n = xread(sock->fd[0], buf, len);
356 if (n <= 0) {
357 socket_perror("read", sock, n);
358 close(sock->fd[0]);
359 close(sock->fd[1]);
360 sock->fd[0] = sock->fd[1] = -1;
361 }
362 return n;
363 }
364
365 static int socket_write(struct imap_socket *sock, const char *buf, int len)
366 {
367 int n;
368 #ifndef NO_OPENSSL
369 if (sock->ssl)
370 n = SSL_write(sock->ssl, buf, len);
371 else
372 #endif
373 n = write_in_full(sock->fd[1], buf, len);
374 if (n != len) {
375 socket_perror("write", sock, n);
376 close(sock->fd[0]);
377 close(sock->fd[1]);
378 sock->fd[0] = sock->fd[1] = -1;
379 }
380 return n;
381 }
382
383 static void socket_shutdown(struct imap_socket *sock)
384 {
385 #ifndef NO_OPENSSL
386 if (sock->ssl) {
387 SSL_shutdown(sock->ssl);
388 SSL_free(sock->ssl);
389 }
390 #endif
391 close(sock->fd[0]);
392 close(sock->fd[1]);
393 }
394
395 /* simple line buffering */
396 static int buffer_gets(struct imap_buffer *b, char **s)
397 {
398 int n;
399 int start = b->offset;
400
401 *s = b->buf + start;
402
403 for (;;) {
404 /* make sure we have enough data to read the \r\n sequence */
405 if (b->offset + 1 >= b->bytes) {
406 if (start) {
407 /* shift down used bytes */
408 *s = b->buf;
409
410 assert(start <= b->bytes);
411 n = b->bytes - start;
412
413 if (n)
414 memmove(b->buf, b->buf + start, n);
415 b->offset -= start;
416 b->bytes = n;
417 start = 0;
418 }
419
420 n = socket_read(&b->sock, b->buf + b->bytes,
421 sizeof(b->buf) - b->bytes);
422
423 if (n <= 0)
424 return -1;
425
426 b->bytes += n;
427 }
428
429 if (b->buf[b->offset] == '\r') {
430 assert(b->offset + 1 < b->bytes);
431 if (b->buf[b->offset + 1] == '\n') {
432 b->buf[b->offset] = 0; /* terminate the string */
433 b->offset += 2; /* next line */
434 if (Verbose)
435 puts(*s);
436 return 0;
437 }
438 }
439
440 b->offset++;
441 }
442 /* not reached */
443 }
444
445 static void imap_info(const char *msg, ...)
446 {
447 va_list va;
448
449 if (!Quiet) {
450 va_start(va, msg);
451 vprintf(msg, va);
452 va_end(va);
453 fflush(stdout);
454 }
455 }
456
457 static void imap_warn(const char *msg, ...)
458 {
459 va_list va;
460
461 if (Quiet < 2) {
462 va_start(va, msg);
463 vfprintf(stderr, msg, va);
464 va_end(va);
465 }
466 }
467
468 static char *next_arg(char **s)
469 {
470 char *ret;
471
472 if (!s || !*s)
473 return NULL;
474 while (isspace((unsigned char) **s))
475 (*s)++;
476 if (!**s) {
477 *s = NULL;
478 return NULL;
479 }
480 if (**s == '"') {
481 ++*s;
482 ret = *s;
483 *s = strchr(*s, '"');
484 } else {
485 ret = *s;
486 while (**s && !isspace((unsigned char) **s))
487 (*s)++;
488 }
489 if (*s) {
490 if (**s)
491 *(*s)++ = 0;
492 if (!**s)
493 *s = NULL;
494 }
495 return ret;
496 }
497
498 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
499 {
500 int ret;
501 va_list va;
502
503 va_start(va, fmt);
504 if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
505 die("Fatal: buffer too small. Please report a bug.");
506 va_end(va);
507 return ret;
508 }
509
510 static struct imap_cmd *v_issue_imap_cmd(struct imap_store *ctx,
511 struct imap_cmd_cb *cb,
512 const char *fmt, va_list ap)
513 {
514 struct imap *imap = ctx->imap;
515 struct imap_cmd *cmd;
516 int n, bufl;
517 char buf[1024];
518
519 cmd = xmalloc(sizeof(struct imap_cmd));
520 nfvasprintf(&cmd->cmd, fmt, ap);
521 cmd->tag = ++imap->nexttag;
522
523 if (cb)
524 cmd->cb = *cb;
525 else
526 memset(&cmd->cb, 0, sizeof(cmd->cb));
527
528 while (imap->literal_pending)
529 get_cmd_result(ctx, NULL);
530
531 if (!cmd->cb.data)
532 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
533 else
534 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
535 cmd->tag, cmd->cmd, cmd->cb.dlen,
536 CAP(LITERALPLUS) ? "+" : "");
537
538 if (Verbose) {
539 if (imap->num_in_progress)
540 printf("(%d in progress) ", imap->num_in_progress);
541 if (memcmp(cmd->cmd, "LOGIN", 5))
542 printf(">>> %s", buf);
543 else
544 printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
545 }
546 if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
547 free(cmd->cmd);
548 free(cmd);
549 if (cb)
550 free(cb->data);
551 return NULL;
552 }
553 if (cmd->cb.data) {
554 if (CAP(LITERALPLUS)) {
555 n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
556 free(cmd->cb.data);
557 if (n != cmd->cb.dlen ||
558 socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
559 free(cmd->cmd);
560 free(cmd);
561 return NULL;
562 }
563 cmd->cb.data = NULL;
564 } else
565 imap->literal_pending = 1;
566 } else if (cmd->cb.cont)
567 imap->literal_pending = 1;
568 cmd->next = NULL;
569 *imap->in_progress_append = cmd;
570 imap->in_progress_append = &cmd->next;
571 imap->num_in_progress++;
572 return cmd;
573 }
574
575 __attribute__((format (printf, 3, 4)))
576 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
577 struct imap_cmd_cb *cb,
578 const char *fmt, ...)
579 {
580 struct imap_cmd *ret;
581 va_list ap;
582
583 va_start(ap, fmt);
584 ret = v_issue_imap_cmd(ctx, cb, fmt, ap);
585 va_end(ap);
586 return ret;
587 }
588
589 __attribute__((format (printf, 3, 4)))
590 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
591 const char *fmt, ...)
592 {
593 va_list ap;
594 struct imap_cmd *cmdp;
595
596 va_start(ap, fmt);
597 cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
598 va_end(ap);
599 if (!cmdp)
600 return RESP_BAD;
601
602 return get_cmd_result(ctx, cmdp);
603 }
604
605 __attribute__((format (printf, 3, 4)))
606 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
607 const char *fmt, ...)
608 {
609 va_list ap;
610 struct imap_cmd *cmdp;
611
612 va_start(ap, fmt);
613 cmdp = v_issue_imap_cmd(ctx, cb, fmt, ap);
614 va_end(ap);
615 if (!cmdp)
616 return DRV_STORE_BAD;
617
618 switch (get_cmd_result(ctx, cmdp)) {
619 case RESP_BAD: return DRV_STORE_BAD;
620 case RESP_NO: return DRV_MSG_BAD;
621 default: return DRV_OK;
622 }
623 }
624
625 static int skip_imap_list_l(char **sp, int level)
626 {
627 char *s = *sp;
628
629 for (;;) {
630 while (isspace((unsigned char)*s))
631 s++;
632 if (level && *s == ')') {
633 s++;
634 break;
635 }
636 if (*s == '(') {
637 /* sublist */
638 s++;
639 if (skip_imap_list_l(&s, level + 1))
640 goto bail;
641 } else if (*s == '"') {
642 /* quoted string */
643 s++;
644 for (; *s != '"'; s++)
645 if (!*s)
646 goto bail;
647 s++;
648 } else {
649 /* atom */
650 for (; *s && !isspace((unsigned char)*s); s++)
651 if (level && *s == ')')
652 break;
653 }
654
655 if (!level)
656 break;
657 if (!*s)
658 goto bail;
659 }
660 *sp = s;
661 return 0;
662
663 bail:
664 return -1;
665 }
666
667 static void skip_list(char **sp)
668 {
669 skip_imap_list_l(sp, 0);
670 }
671
672 static void parse_capability(struct imap *imap, char *cmd)
673 {
674 char *arg;
675 unsigned i;
676
677 imap->caps = 0x80000000;
678 while ((arg = next_arg(&cmd)))
679 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
680 if (!strcmp(cap_list[i], arg))
681 imap->caps |= 1 << i;
682 imap->rcaps = imap->caps;
683 }
684
685 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
686 char *s)
687 {
688 struct imap *imap = ctx->imap;
689 char *arg, *p;
690
691 if (*s != '[')
692 return RESP_OK; /* no response code */
693 s++;
694 if (!(p = strchr(s, ']'))) {
695 fprintf(stderr, "IMAP error: malformed response code\n");
696 return RESP_BAD;
697 }
698 *p++ = 0;
699 arg = next_arg(&s);
700 if (!strcmp("UIDVALIDITY", arg)) {
701 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
702 fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
703 return RESP_BAD;
704 }
705 } else if (!strcmp("UIDNEXT", arg)) {
706 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
707 fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
708 return RESP_BAD;
709 }
710 } else if (!strcmp("CAPABILITY", arg)) {
711 parse_capability(imap, s);
712 } else if (!strcmp("ALERT", arg)) {
713 /* RFC2060 says that these messages MUST be displayed
714 * to the user
715 */
716 for (; isspace((unsigned char)*p); p++);
717 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
718 } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
719 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
720 !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
721 fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
722 return RESP_BAD;
723 }
724 }
725 return RESP_OK;
726 }
727
728 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
729 {
730 struct imap *imap = ctx->imap;
731 struct imap_cmd *cmdp, **pcmdp, *ncmdp;
732 char *cmd, *arg, *arg1, *p;
733 int n, resp, resp2, tag;
734
735 for (;;) {
736 if (buffer_gets(&imap->buf, &cmd))
737 return RESP_BAD;
738
739 arg = next_arg(&cmd);
740 if (*arg == '*') {
741 arg = next_arg(&cmd);
742 if (!arg) {
743 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
744 return RESP_BAD;
745 }
746
747 if (!strcmp("NAMESPACE", arg)) {
748 /* rfc2342 NAMESPACE response. */
749 skip_list(&cmd); /* Personal mailboxes */
750 skip_list(&cmd); /* Others' mailboxes */
751 skip_list(&cmd); /* Shared mailboxes */
752 } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
753 !strcmp("NO", arg) || !strcmp("BYE", arg)) {
754 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
755 return resp;
756 } else if (!strcmp("CAPABILITY", arg)) {
757 parse_capability(imap, cmd);
758 } else if ((arg1 = next_arg(&cmd))) {
759 ; /*
760 * Unhandled response-data with at least two words.
761 * Ignore it.
762 *
763 * NEEDSWORK: Previously this case handled '<num> EXISTS'
764 * and '<num> RECENT' but as a probably-unintended side
765 * effect it ignores other unrecognized two-word
766 * responses. imap-send doesn't ever try to read
767 * messages or mailboxes these days, so consider
768 * eliminating this case.
769 */
770 } else {
771 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
772 return RESP_BAD;
773 }
774 } else if (!imap->in_progress) {
775 fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
776 return RESP_BAD;
777 } else if (*arg == '+') {
778 /* This can happen only with the last command underway, as
779 it enforces a round-trip. */
780 cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
781 offsetof(struct imap_cmd, next));
782 if (cmdp->cb.data) {
783 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
784 free(cmdp->cb.data);
785 cmdp->cb.data = NULL;
786 if (n != (int)cmdp->cb.dlen)
787 return RESP_BAD;
788 } else if (cmdp->cb.cont) {
789 if (cmdp->cb.cont(ctx, cmdp, cmd))
790 return RESP_BAD;
791 } else {
792 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
793 return RESP_BAD;
794 }
795 if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
796 return RESP_BAD;
797 if (!cmdp->cb.cont)
798 imap->literal_pending = 0;
799 if (!tcmd)
800 return DRV_OK;
801 } else {
802 tag = atoi(arg);
803 for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
804 if (cmdp->tag == tag)
805 goto gottag;
806 fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
807 return RESP_BAD;
808 gottag:
809 if (!(*pcmdp = cmdp->next))
810 imap->in_progress_append = pcmdp;
811 imap->num_in_progress--;
812 if (cmdp->cb.cont || cmdp->cb.data)
813 imap->literal_pending = 0;
814 arg = next_arg(&cmd);
815 if (!strcmp("OK", arg))
816 resp = DRV_OK;
817 else {
818 if (!strcmp("NO", arg)) {
819 if (cmdp->cb.create && cmd && (cmdp->cb.trycreate || !memcmp(cmd, "[TRYCREATE]", 11))) { /* SELECT, APPEND or UID COPY */
820 p = strchr(cmdp->cmd, '"');
821 if (!issue_imap_cmd(ctx, NULL, "CREATE \"%.*s\"", (int)(strchr(p + 1, '"') - p + 1), p)) {
822 resp = RESP_BAD;
823 goto normal;
824 }
825 /* not waiting here violates the spec, but a server that does not
826 grok this nonetheless violates it too. */
827 cmdp->cb.create = 0;
828 if (!(ncmdp = issue_imap_cmd(ctx, &cmdp->cb, "%s", cmdp->cmd))) {
829 resp = RESP_BAD;
830 goto normal;
831 }
832 free(cmdp->cmd);
833 free(cmdp);
834 if (!tcmd)
835 return 0; /* ignored */
836 if (cmdp == tcmd)
837 tcmd = ncmdp;
838 continue;
839 }
840 resp = RESP_NO;
841 } else /*if (!strcmp("BAD", arg))*/
842 resp = RESP_BAD;
843 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
844 memcmp(cmdp->cmd, "LOGIN", 5) ?
845 cmdp->cmd : "LOGIN <user> <pass>",
846 arg, cmd ? cmd : "");
847 }
848 if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
849 resp = resp2;
850 normal:
851 if (cmdp->cb.done)
852 cmdp->cb.done(ctx, cmdp, resp);
853 free(cmdp->cb.data);
854 free(cmdp->cmd);
855 free(cmdp);
856 if (!tcmd || tcmd == cmdp)
857 return resp;
858 }
859 }
860 /* not reached */
861 }
862
863 static void imap_close_server(struct imap_store *ictx)
864 {
865 struct imap *imap = ictx->imap;
866
867 if (imap->buf.sock.fd[0] != -1) {
868 imap_exec(ictx, NULL, "LOGOUT");
869 socket_shutdown(&imap->buf.sock);
870 }
871 free(imap);
872 }
873
874 static void imap_close_store(struct imap_store *ctx)
875 {
876 imap_close_server(ctx);
877 free(ctx);
878 }
879
880 #ifndef NO_OPENSSL
881
882 /*
883 * hexchar() and cram() functions are based on the code from the isync
884 * project (http://isync.sf.net/).
885 */
886 static char hexchar(unsigned int b)
887 {
888 return b < 10 ? '0' + b : 'a' + (b - 10);
889 }
890
891 #define ENCODED_SIZE(n) (4*((n+2)/3))
892 static char *cram(const char *challenge_64, const char *user, const char *pass)
893 {
894 int i, resp_len, encoded_len, decoded_len;
895 HMAC_CTX hmac;
896 unsigned char hash[16];
897 char hex[33];
898 char *response, *response_64, *challenge;
899
900 /*
901 * length of challenge_64 (i.e. base-64 encoded string) is a good
902 * enough upper bound for challenge (decoded result).
903 */
904 encoded_len = strlen(challenge_64);
905 challenge = xmalloc(encoded_len);
906 decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
907 (unsigned char *)challenge_64, encoded_len);
908 if (decoded_len < 0)
909 die("invalid challenge %s", challenge_64);
910 HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
911 HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
912 HMAC_Final(&hmac, hash, NULL);
913 HMAC_CTX_cleanup(&hmac);
914
915 hex[32] = 0;
916 for (i = 0; i < 16; i++) {
917 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
918 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
919 }
920
921 /* response: "<user> <digest in hex>" */
922 resp_len = strlen(user) + 1 + strlen(hex) + 1;
923 response = xmalloc(resp_len);
924 sprintf(response, "%s %s", user, hex);
925
926 response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
927 encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
928 (unsigned char *)response, resp_len);
929 if (encoded_len < 0)
930 die("EVP_EncodeBlock error");
931 response_64[encoded_len] = '\0';
932 return (char *)response_64;
933 }
934
935 #else
936
937 static char *cram(const char *challenge_64, const char *user, const char *pass)
938 {
939 die("If you want to use CRAM-MD5 authenticate method, "
940 "you have to build git-imap-send with OpenSSL library.");
941 }
942
943 #endif
944
945 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
946 {
947 int ret;
948 char *response;
949
950 response = cram(prompt, server.user, server.pass);
951
952 ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
953 if (ret != strlen(response))
954 return error("IMAP error: sending response failed");
955
956 free(response);
957
958 return 0;
959 }
960
961 static struct imap_store *imap_open_store(struct imap_server_conf *srvc)
962 {
963 struct imap_store *ctx;
964 struct imap *imap;
965 char *arg, *rsp;
966 int s = -1, preauth;
967
968 ctx = xcalloc(sizeof(*ctx), 1);
969
970 ctx->imap = imap = xcalloc(sizeof(*imap), 1);
971 imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
972 imap->in_progress_append = &imap->in_progress;
973
974 /* open connection to IMAP server */
975
976 if (srvc->tunnel) {
977 const char *argv[] = { srvc->tunnel, NULL };
978 struct child_process tunnel = {NULL};
979
980 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
981
982 tunnel.argv = argv;
983 tunnel.use_shell = 1;
984 tunnel.in = -1;
985 tunnel.out = -1;
986 if (start_command(&tunnel))
987 die("cannot start proxy %s", argv[0]);
988
989 imap->buf.sock.fd[0] = tunnel.out;
990 imap->buf.sock.fd[1] = tunnel.in;
991
992 imap_info("ok\n");
993 } else {
994 #ifndef NO_IPV6
995 struct addrinfo hints, *ai0, *ai;
996 int gai;
997 char portstr[6];
998
999 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
1000
1001 memset(&hints, 0, sizeof(hints));
1002 hints.ai_socktype = SOCK_STREAM;
1003 hints.ai_protocol = IPPROTO_TCP;
1004
1005 imap_info("Resolving %s... ", srvc->host);
1006 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
1007 if (gai) {
1008 fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
1009 goto bail;
1010 }
1011 imap_info("ok\n");
1012
1013 for (ai0 = ai; ai; ai = ai->ai_next) {
1014 char addr[NI_MAXHOST];
1015
1016 s = socket(ai->ai_family, ai->ai_socktype,
1017 ai->ai_protocol);
1018 if (s < 0)
1019 continue;
1020
1021 getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1022 sizeof(addr), NULL, 0, NI_NUMERICHOST);
1023 imap_info("Connecting to [%s]:%s... ", addr, portstr);
1024
1025 if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1026 close(s);
1027 s = -1;
1028 perror("connect");
1029 continue;
1030 }
1031
1032 break;
1033 }
1034 freeaddrinfo(ai0);
1035 #else /* NO_IPV6 */
1036 struct hostent *he;
1037 struct sockaddr_in addr;
1038
1039 memset(&addr, 0, sizeof(addr));
1040 addr.sin_port = htons(srvc->port);
1041 addr.sin_family = AF_INET;
1042
1043 imap_info("Resolving %s... ", srvc->host);
1044 he = gethostbyname(srvc->host);
1045 if (!he) {
1046 perror("gethostbyname");
1047 goto bail;
1048 }
1049 imap_info("ok\n");
1050
1051 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1052
1053 s = socket(PF_INET, SOCK_STREAM, 0);
1054
1055 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1056 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1057 close(s);
1058 s = -1;
1059 perror("connect");
1060 }
1061 #endif
1062 if (s < 0) {
1063 fputs("Error: unable to connect to server.\n", stderr);
1064 goto bail;
1065 }
1066
1067 imap->buf.sock.fd[0] = s;
1068 imap->buf.sock.fd[1] = dup(s);
1069
1070 if (srvc->use_ssl &&
1071 ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1072 close(s);
1073 goto bail;
1074 }
1075 imap_info("ok\n");
1076 }
1077
1078 /* read the greeting string */
1079 if (buffer_gets(&imap->buf, &rsp)) {
1080 fprintf(stderr, "IMAP error: no greeting response\n");
1081 goto bail;
1082 }
1083 arg = next_arg(&rsp);
1084 if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1085 fprintf(stderr, "IMAP error: invalid greeting response\n");
1086 goto bail;
1087 }
1088 preauth = 0;
1089 if (!strcmp("PREAUTH", arg))
1090 preauth = 1;
1091 else if (strcmp("OK", arg) != 0) {
1092 fprintf(stderr, "IMAP error: unknown greeting response\n");
1093 goto bail;
1094 }
1095 parse_response_code(ctx, NULL, rsp);
1096 if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1097 goto bail;
1098
1099 if (!preauth) {
1100 #ifndef NO_OPENSSL
1101 if (!srvc->use_ssl && CAP(STARTTLS)) {
1102 if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1103 goto bail;
1104 if (ssl_socket_connect(&imap->buf.sock, 1,
1105 srvc->ssl_verify))
1106 goto bail;
1107 /* capabilities may have changed, so get the new capabilities */
1108 if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1109 goto bail;
1110 }
1111 #endif
1112 imap_info("Logging in...\n");
1113 if (!srvc->user) {
1114 fprintf(stderr, "Skipping server %s, no user\n", srvc->host);
1115 goto bail;
1116 }
1117 if (!srvc->pass) {
1118 struct strbuf prompt = STRBUF_INIT;
1119 strbuf_addf(&prompt, "Password (%s@%s): ", srvc->user, srvc->host);
1120 arg = git_getpass(prompt.buf);
1121 strbuf_release(&prompt);
1122 if (!*arg) {
1123 fprintf(stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host);
1124 goto bail;
1125 }
1126 /*
1127 * getpass() returns a pointer to a static buffer. make a copy
1128 * for long term storage.
1129 */
1130 srvc->pass = xstrdup(arg);
1131 }
1132 if (CAP(NOLOGIN)) {
1133 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1134 goto bail;
1135 }
1136
1137 if (srvc->auth_method) {
1138 struct imap_cmd_cb cb;
1139
1140 if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1141 if (!CAP(AUTH_CRAM_MD5)) {
1142 fprintf(stderr, "You specified"
1143 "CRAM-MD5 as authentication method, "
1144 "but %s doesn't support it.\n", srvc->host);
1145 goto bail;
1146 }
1147 /* CRAM-MD5 */
1148
1149 memset(&cb, 0, sizeof(cb));
1150 cb.cont = auth_cram_md5;
1151 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1152 fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1153 goto bail;
1154 }
1155 } else {
1156 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1157 goto bail;
1158 }
1159 } else {
1160 if (!imap->buf.sock.ssl)
1161 imap_warn("*** IMAP Warning *** Password is being "
1162 "sent in the clear\n");
1163 if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1164 fprintf(stderr, "IMAP error: LOGIN failed\n");
1165 goto bail;
1166 }
1167 }
1168 } /* !preauth */
1169
1170 ctx->prefix = "";
1171 return ctx;
1172
1173 bail:
1174 imap_close_store(ctx);
1175 return NULL;
1176 }
1177
1178 /*
1179 * Insert CR characters as necessary in *msg to ensure that every LF
1180 * character in *msg is preceded by a CR.
1181 */
1182 static void lf_to_crlf(struct strbuf *msg)
1183 {
1184 char *new;
1185 size_t i, j;
1186 char lastc;
1187
1188 /* First pass: tally, in j, the size of the new string: */
1189 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1190 if (msg->buf[i] == '\n' && lastc != '\r')
1191 j++; /* a CR will need to be added here */
1192 lastc = msg->buf[i];
1193 j++;
1194 }
1195
1196 new = xmalloc(j + 1);
1197
1198 /*
1199 * Second pass: write the new string. Note that this loop is
1200 * otherwise identical to the first pass.
1201 */
1202 for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1203 if (msg->buf[i] == '\n' && lastc != '\r')
1204 new[j++] = '\r';
1205 lastc = new[j++] = msg->buf[i];
1206 }
1207 strbuf_attach(msg, new, j, j + 1);
1208 }
1209
1210 /*
1211 * Store msg to IMAP. Also detach and free the data from msg->data,
1212 * leaving msg->data empty.
1213 */
1214 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1215 {
1216 struct imap *imap = ctx->imap;
1217 struct imap_cmd_cb cb;
1218 const char *prefix, *box;
1219 int ret;
1220
1221 lf_to_crlf(msg);
1222 memset(&cb, 0, sizeof(cb));
1223
1224 cb.dlen = msg->len;
1225 cb.data = strbuf_detach(msg, NULL);
1226
1227 box = ctx->name;
1228 prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1229 cb.create = 0;
1230 ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1231 imap->caps = imap->rcaps;
1232 if (ret != DRV_OK)
1233 return ret;
1234
1235 return DRV_OK;
1236 }
1237
1238 static void wrap_in_html(struct strbuf *msg)
1239 {
1240 struct strbuf buf = STRBUF_INIT;
1241 static char *content_type = "Content-Type: text/html;\n";
1242 static char *pre_open = "<pre>\n";
1243 static char *pre_close = "</pre>\n";
1244 const char *body = strstr(msg->buf, "\n\n");
1245
1246 if (!body)
1247 return; /* Headers but no body; no wrapping needed */
1248
1249 body += 2;
1250
1251 strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1252 strbuf_addstr(&buf, content_type);
1253 strbuf_addch(&buf, '\n');
1254 strbuf_addstr(&buf, pre_open);
1255 strbuf_addstr_xml_quoted(&buf, body);
1256 strbuf_addstr(&buf, pre_close);
1257
1258 strbuf_release(msg);
1259 *msg = buf;
1260 }
1261
1262 #define CHUNKSIZE 0x1000
1263
1264 static int read_message(FILE *f, struct strbuf *all_msgs)
1265 {
1266 do {
1267 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1268 break;
1269 } while (!feof(f));
1270
1271 return ferror(f) ? -1 : 0;
1272 }
1273
1274 static int count_messages(struct strbuf *all_msgs)
1275 {
1276 int count = 0;
1277 char *p = all_msgs->buf;
1278
1279 while (1) {
1280 if (!prefixcmp(p, "From ")) {
1281 p = strstr(p+5, "\nFrom: ");
1282 if (!p) break;
1283 p = strstr(p+7, "\nDate: ");
1284 if (!p) break;
1285 p = strstr(p+7, "\nSubject: ");
1286 if (!p) break;
1287 p += 10;
1288 count++;
1289 }
1290 p = strstr(p+5, "\nFrom ");
1291 if (!p)
1292 break;
1293 p++;
1294 }
1295 return count;
1296 }
1297
1298 /*
1299 * Copy the next message from all_msgs, starting at offset *ofs, to
1300 * msg. Update *ofs to the start of the following message. Return
1301 * true iff a message was successfully copied.
1302 */
1303 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1304 {
1305 char *p, *data;
1306 size_t len;
1307
1308 if (*ofs >= all_msgs->len)
1309 return 0;
1310
1311 data = &all_msgs->buf[*ofs];
1312 len = all_msgs->len - *ofs;
1313
1314 if (len < 5 || prefixcmp(data, "From "))
1315 return 0;
1316
1317 p = strchr(data, '\n');
1318 if (p) {
1319 p++;
1320 len -= p - data;
1321 *ofs += p - data;
1322 data = p;
1323 }
1324
1325 p = strstr(data, "\nFrom ");
1326 if (p)
1327 len = &p[1] - data;
1328
1329 strbuf_add(msg, data, len);
1330 *ofs += len;
1331 return 1;
1332 }
1333
1334 static char *imap_folder;
1335
1336 static int git_imap_config(const char *key, const char *val, void *cb)
1337 {
1338 char imap_key[] = "imap.";
1339
1340 if (strncmp(key, imap_key, sizeof imap_key - 1))
1341 return 0;
1342
1343 key += sizeof imap_key - 1;
1344
1345 /* check booleans first, and barf on others */
1346 if (!strcmp("sslverify", key))
1347 server.ssl_verify = git_config_bool(key, val);
1348 else if (!strcmp("preformattedhtml", key))
1349 server.use_html = git_config_bool(key, val);
1350 else if (!val)
1351 return config_error_nonbool(key);
1352
1353 if (!strcmp("folder", key)) {
1354 imap_folder = xstrdup(val);
1355 } else if (!strcmp("host", key)) {
1356 if (!prefixcmp(val, "imap:"))
1357 val += 5;
1358 else if (!prefixcmp(val, "imaps:")) {
1359 val += 6;
1360 server.use_ssl = 1;
1361 }
1362 if (!prefixcmp(val, "//"))
1363 val += 2;
1364 server.host = xstrdup(val);
1365 } else if (!strcmp("user", key))
1366 server.user = xstrdup(val);
1367 else if (!strcmp("pass", key))
1368 server.pass = xstrdup(val);
1369 else if (!strcmp("port", key))
1370 server.port = git_config_int(key, val);
1371 else if (!strcmp("tunnel", key))
1372 server.tunnel = xstrdup(val);
1373 else if (!strcmp("authmethod", key))
1374 server.auth_method = xstrdup(val);
1375
1376 return 0;
1377 }
1378
1379 int main(int argc, char **argv)
1380 {
1381 struct strbuf all_msgs = STRBUF_INIT;
1382 struct strbuf msg = STRBUF_INIT;
1383 struct imap_store *ctx = NULL;
1384 int ofs = 0;
1385 int r;
1386 int total, n = 0;
1387 int nongit_ok;
1388
1389 git_extract_argv0_path(argv[0]);
1390
1391 git_setup_gettext();
1392
1393 if (argc != 1)
1394 usage(imap_send_usage);
1395
1396 setup_git_directory_gently(&nongit_ok);
1397 git_config(git_imap_config, NULL);
1398
1399 if (!server.port)
1400 server.port = server.use_ssl ? 993 : 143;
1401
1402 if (!imap_folder) {
1403 fprintf(stderr, "no imap store specified\n");
1404 return 1;
1405 }
1406 if (!server.host) {
1407 if (!server.tunnel) {
1408 fprintf(stderr, "no imap host specified\n");
1409 return 1;
1410 }
1411 server.host = "tunnel";
1412 }
1413
1414 /* read the messages */
1415 if (read_message(stdin, &all_msgs)) {
1416 fprintf(stderr, "error reading input\n");
1417 return 1;
1418 }
1419
1420 if (all_msgs.len == 0) {
1421 fprintf(stderr, "nothing to send\n");
1422 return 1;
1423 }
1424
1425 total = count_messages(&all_msgs);
1426 if (!total) {
1427 fprintf(stderr, "no messages to send\n");
1428 return 1;
1429 }
1430
1431 /* write it to the imap server */
1432 ctx = imap_open_store(&server);
1433 if (!ctx) {
1434 fprintf(stderr, "failed to open store\n");
1435 return 1;
1436 }
1437
1438 fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1439 ctx->name = imap_folder;
1440 while (1) {
1441 unsigned percent = n * 100 / total;
1442
1443 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1444 if (!split_msg(&all_msgs, &msg, &ofs))
1445 break;
1446 if (server.use_html)
1447 wrap_in_html(&msg);
1448 r = imap_store_msg(ctx, &msg);
1449 if (r != DRV_OK)
1450 break;
1451 n++;
1452 }
1453 fprintf(stderr, "\n");
1454
1455 imap_close_store(ctx);
1456
1457 return 0;
1458 }
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