pretty: test --expand-tabs
[git] / imap-send.c
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 #ifdef USE_CURL_FOR_IMAP_SEND
34 #include "http.h"
35 #endif
36
37 #if defined(USE_CURL_FOR_IMAP_SEND) && defined(NO_OPENSSL)
38 /* only available option */
39 #define USE_CURL_DEFAULT 1
40 #else
41 /* strictly opt in */
42 #define USE_CURL_DEFAULT 0
43 #endif
44
45 static int verbosity;
46 static int use_curl = USE_CURL_DEFAULT;
47
48 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
49
50 static struct option imap_send_options[] = {
51         OPT__VERBOSITY(&verbosity),
52         OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
53         OPT_END()
54 };
55
56 #undef DRV_OK
57 #define DRV_OK          0
58 #define DRV_MSG_BAD     -1
59 #define DRV_BOX_BAD     -2
60 #define DRV_STORE_BAD   -3
61
62 __attribute__((format (printf, 1, 2)))
63 static void imap_info(const char *, ...);
64 __attribute__((format (printf, 1, 2)))
65 static void imap_warn(const char *, ...);
66
67 static char *next_arg(char **);
68
69 __attribute__((format (printf, 3, 4)))
70 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
71
72 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
73 {
74         int len;
75         char tmp[8192];
76
77         len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
78         if (len < 0)
79                 die("Fatal: Out of memory");
80         if (len >= sizeof(tmp))
81                 die("imap command overflow!");
82         *strp = xmemdupz(tmp, len);
83         return len;
84 }
85
86 struct imap_server_conf {
87         char *name;
88         char *tunnel;
89         char *host;
90         int port;
91         char *folder;
92         char *user;
93         char *pass;
94         int use_ssl;
95         int ssl_verify;
96         int use_html;
97         char *auth_method;
98 };
99
100 static struct imap_server_conf server = {
101         NULL,   /* name */
102         NULL,   /* tunnel */
103         NULL,   /* host */
104         0,      /* port */
105         NULL,   /* folder */
106         NULL,   /* user */
107         NULL,   /* pass */
108         0,      /* use_ssl */
109         1,      /* ssl_verify */
110         0,      /* use_html */
111         NULL,   /* auth_method */
112 };
113
114 struct imap_socket {
115         int fd[2];
116         SSL *ssl;
117 };
118
119 struct imap_buffer {
120         struct imap_socket sock;
121         int bytes;
122         int offset;
123         char buf[1024];
124 };
125
126 struct imap_cmd;
127
128 struct imap {
129         int uidnext; /* from SELECT responses */
130         unsigned caps, rcaps; /* CAPABILITY results */
131         /* command queue */
132         int nexttag, num_in_progress, literal_pending;
133         struct imap_cmd *in_progress, **in_progress_append;
134         struct imap_buffer buf; /* this is BIG, so put it last */
135 };
136
137 struct imap_store {
138         /* currently open mailbox */
139         const char *name; /* foreign! maybe preset? */
140         int uidvalidity;
141         struct imap *imap;
142         const char *prefix;
143 };
144
145 struct imap_cmd_cb {
146         int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
147         void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
148         void *ctx;
149         char *data;
150         int dlen;
151         int uid;
152 };
153
154 struct imap_cmd {
155         struct imap_cmd *next;
156         struct imap_cmd_cb cb;
157         char *cmd;
158         int tag;
159 };
160
161 #define CAP(cap) (imap->caps & (1 << (cap)))
162
163 enum CAPABILITY {
164         NOLOGIN = 0,
165         UIDPLUS,
166         LITERALPLUS,
167         NAMESPACE,
168         STARTTLS,
169         AUTH_CRAM_MD5
170 };
171
172 static const char *cap_list[] = {
173         "LOGINDISABLED",
174         "UIDPLUS",
175         "LITERAL+",
176         "NAMESPACE",
177         "STARTTLS",
178         "AUTH=CRAM-MD5",
179 };
180
181 #define RESP_OK    0
182 #define RESP_NO    1
183 #define RESP_BAD   2
184
185 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
186
187
188 #ifndef NO_OPENSSL
189 static void ssl_socket_perror(const char *func)
190 {
191         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
192 }
193 #endif
194
195 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
196 {
197 #ifndef NO_OPENSSL
198         if (sock->ssl) {
199                 int sslerr = SSL_get_error(sock->ssl, ret);
200                 switch (sslerr) {
201                 case SSL_ERROR_NONE:
202                         break;
203                 case SSL_ERROR_SYSCALL:
204                         perror("SSL_connect");
205                         break;
206                 default:
207                         ssl_socket_perror("SSL_connect");
208                         break;
209                 }
210         } else
211 #endif
212         {
213                 if (ret < 0)
214                         perror(func);
215                 else
216                         fprintf(stderr, "%s: unexpected EOF\n", func);
217         }
218 }
219
220 #ifdef NO_OPENSSL
221 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
222 {
223         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
224         return -1;
225 }
226
227 #else
228
229 static int host_matches(const char *host, const char *pattern)
230 {
231         if (pattern[0] == '*' && pattern[1] == '.') {
232                 pattern += 2;
233                 if (!(host = strchr(host, '.')))
234                         return 0;
235                 host++;
236         }
237
238         return *host && *pattern && !strcasecmp(host, pattern);
239 }
240
241 static int verify_hostname(X509 *cert, const char *hostname)
242 {
243         int len;
244         X509_NAME *subj;
245         char cname[1000];
246         int i, found;
247         STACK_OF(GENERAL_NAME) *subj_alt_names;
248
249         /* try the DNS subjectAltNames */
250         found = 0;
251         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
252                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
253                 for (i = 0; !found && i < num_subj_alt_names; i++) {
254                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
255                         if (subj_alt_name->type == GEN_DNS &&
256                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
257                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
258                                 found = 1;
259                 }
260                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
261         }
262         if (found)
263                 return 0;
264
265         /* try the common name */
266         if (!(subj = X509_get_subject_name(cert)))
267                 return error("cannot get certificate subject");
268         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
269                 return error("cannot get certificate common name");
270         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
271                 return 0;
272         return error("certificate owner '%s' does not match hostname '%s'",
273                      cname, hostname);
274 }
275
276 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
277 {
278 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
279         const SSL_METHOD *meth;
280 #else
281         SSL_METHOD *meth;
282 #endif
283         SSL_CTX *ctx;
284         int ret;
285         X509 *cert;
286
287         SSL_library_init();
288         SSL_load_error_strings();
289
290         if (use_tls_only)
291                 meth = TLSv1_method();
292         else
293                 meth = SSLv23_method();
294
295         if (!meth) {
296                 ssl_socket_perror("SSLv23_method");
297                 return -1;
298         }
299
300         ctx = SSL_CTX_new(meth);
301
302         if (verify)
303                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
304
305         if (!SSL_CTX_set_default_verify_paths(ctx)) {
306                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
307                 return -1;
308         }
309         sock->ssl = SSL_new(ctx);
310         if (!sock->ssl) {
311                 ssl_socket_perror("SSL_new");
312                 return -1;
313         }
314         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
315                 ssl_socket_perror("SSL_set_rfd");
316                 return -1;
317         }
318         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
319                 ssl_socket_perror("SSL_set_wfd");
320                 return -1;
321         }
322
323 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
324         /*
325          * SNI (RFC4366)
326          * OpenSSL does not document this function, but the implementation
327          * returns 1 on success, 0 on failure after calling SSLerr().
328          */
329         ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
330         if (ret != 1)
331                 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
332 #endif
333
334         ret = SSL_connect(sock->ssl);
335         if (ret <= 0) {
336                 socket_perror("SSL_connect", sock, ret);
337                 return -1;
338         }
339
340         if (verify) {
341                 /* make sure the hostname matches that of the certificate */
342                 cert = SSL_get_peer_certificate(sock->ssl);
343                 if (!cert)
344                         return error("unable to get peer certificate.");
345                 if (verify_hostname(cert, server.host) < 0)
346                         return -1;
347         }
348
349         return 0;
350 }
351 #endif
352
353 static int socket_read(struct imap_socket *sock, char *buf, int len)
354 {
355         ssize_t n;
356 #ifndef NO_OPENSSL
357         if (sock->ssl)
358                 n = SSL_read(sock->ssl, buf, len);
359         else
360 #endif
361                 n = xread(sock->fd[0], buf, len);
362         if (n <= 0) {
363                 socket_perror("read", sock, n);
364                 close(sock->fd[0]);
365                 close(sock->fd[1]);
366                 sock->fd[0] = sock->fd[1] = -1;
367         }
368         return n;
369 }
370
371 static int socket_write(struct imap_socket *sock, const char *buf, int len)
372 {
373         int n;
374 #ifndef NO_OPENSSL
375         if (sock->ssl)
376                 n = SSL_write(sock->ssl, buf, len);
377         else
378 #endif
379                 n = write_in_full(sock->fd[1], buf, len);
380         if (n != len) {
381                 socket_perror("write", sock, n);
382                 close(sock->fd[0]);
383                 close(sock->fd[1]);
384                 sock->fd[0] = sock->fd[1] = -1;
385         }
386         return n;
387 }
388
389 static void socket_shutdown(struct imap_socket *sock)
390 {
391 #ifndef NO_OPENSSL
392         if (sock->ssl) {
393                 SSL_shutdown(sock->ssl);
394                 SSL_free(sock->ssl);
395         }
396 #endif
397         close(sock->fd[0]);
398         close(sock->fd[1]);
399 }
400
401 /* simple line buffering */
402 static int buffer_gets(struct imap_buffer *b, char **s)
403 {
404         int n;
405         int start = b->offset;
406
407         *s = b->buf + start;
408
409         for (;;) {
410                 /* make sure we have enough data to read the \r\n sequence */
411                 if (b->offset + 1 >= b->bytes) {
412                         if (start) {
413                                 /* shift down used bytes */
414                                 *s = b->buf;
415
416                                 assert(start <= b->bytes);
417                                 n = b->bytes - start;
418
419                                 if (n)
420                                         memmove(b->buf, b->buf + start, n);
421                                 b->offset -= start;
422                                 b->bytes = n;
423                                 start = 0;
424                         }
425
426                         n = socket_read(&b->sock, b->buf + b->bytes,
427                                          sizeof(b->buf) - b->bytes);
428
429                         if (n <= 0)
430                                 return -1;
431
432                         b->bytes += n;
433                 }
434
435                 if (b->buf[b->offset] == '\r') {
436                         assert(b->offset + 1 < b->bytes);
437                         if (b->buf[b->offset + 1] == '\n') {
438                                 b->buf[b->offset] = 0;  /* terminate the string */
439                                 b->offset += 2; /* next line */
440                                 if (0 < verbosity)
441                                         puts(*s);
442                                 return 0;
443                         }
444                 }
445
446                 b->offset++;
447         }
448         /* not reached */
449 }
450
451 static void imap_info(const char *msg, ...)
452 {
453         va_list va;
454
455         if (0 <= verbosity) {
456                 va_start(va, msg);
457                 vprintf(msg, va);
458                 va_end(va);
459                 fflush(stdout);
460         }
461 }
462
463 static void imap_warn(const char *msg, ...)
464 {
465         va_list va;
466
467         if (-2 < verbosity) {
468                 va_start(va, msg);
469                 vfprintf(stderr, msg, va);
470                 va_end(va);
471         }
472 }
473
474 static char *next_arg(char **s)
475 {
476         char *ret;
477
478         if (!s || !*s)
479                 return NULL;
480         while (isspace((unsigned char) **s))
481                 (*s)++;
482         if (!**s) {
483                 *s = NULL;
484                 return NULL;
485         }
486         if (**s == '"') {
487                 ++*s;
488                 ret = *s;
489                 *s = strchr(*s, '"');
490         } else {
491                 ret = *s;
492                 while (**s && !isspace((unsigned char) **s))
493                         (*s)++;
494         }
495         if (*s) {
496                 if (**s)
497                         *(*s)++ = 0;
498                 if (!**s)
499                         *s = NULL;
500         }
501         return ret;
502 }
503
504 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
505 {
506         int ret;
507         va_list va;
508
509         va_start(va, fmt);
510         if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
511                 die("Fatal: buffer too small. Please report a bug.");
512         va_end(va);
513         return ret;
514 }
515
516 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
517                                        struct imap_cmd_cb *cb,
518                                        const char *fmt, va_list ap)
519 {
520         struct imap *imap = ctx->imap;
521         struct imap_cmd *cmd;
522         int n, bufl;
523         char buf[1024];
524
525         cmd = xmalloc(sizeof(struct imap_cmd));
526         nfvasprintf(&cmd->cmd, fmt, ap);
527         cmd->tag = ++imap->nexttag;
528
529         if (cb)
530                 cmd->cb = *cb;
531         else
532                 memset(&cmd->cb, 0, sizeof(cmd->cb));
533
534         while (imap->literal_pending)
535                 get_cmd_result(ctx, NULL);
536
537         if (!cmd->cb.data)
538                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
539         else
540                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
541                                   cmd->tag, cmd->cmd, cmd->cb.dlen,
542                                   CAP(LITERALPLUS) ? "+" : "");
543
544         if (0 < verbosity) {
545                 if (imap->num_in_progress)
546                         printf("(%d in progress) ", imap->num_in_progress);
547                 if (!starts_with(cmd->cmd, "LOGIN"))
548                         printf(">>> %s", buf);
549                 else
550                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
551         }
552         if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
553                 free(cmd->cmd);
554                 free(cmd);
555                 if (cb)
556                         free(cb->data);
557                 return NULL;
558         }
559         if (cmd->cb.data) {
560                 if (CAP(LITERALPLUS)) {
561                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
562                         free(cmd->cb.data);
563                         if (n != cmd->cb.dlen ||
564                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
565                                 free(cmd->cmd);
566                                 free(cmd);
567                                 return NULL;
568                         }
569                         cmd->cb.data = NULL;
570                 } else
571                         imap->literal_pending = 1;
572         } else if (cmd->cb.cont)
573                 imap->literal_pending = 1;
574         cmd->next = NULL;
575         *imap->in_progress_append = cmd;
576         imap->in_progress_append = &cmd->next;
577         imap->num_in_progress++;
578         return cmd;
579 }
580
581 __attribute__((format (printf, 3, 4)))
582 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
583                      const char *fmt, ...)
584 {
585         va_list ap;
586         struct imap_cmd *cmdp;
587
588         va_start(ap, fmt);
589         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
590         va_end(ap);
591         if (!cmdp)
592                 return RESP_BAD;
593
594         return get_cmd_result(ctx, cmdp);
595 }
596
597 __attribute__((format (printf, 3, 4)))
598 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
599                        const char *fmt, ...)
600 {
601         va_list ap;
602         struct imap_cmd *cmdp;
603
604         va_start(ap, fmt);
605         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
606         va_end(ap);
607         if (!cmdp)
608                 return DRV_STORE_BAD;
609
610         switch (get_cmd_result(ctx, cmdp)) {
611         case RESP_BAD: return DRV_STORE_BAD;
612         case RESP_NO: return DRV_MSG_BAD;
613         default: return DRV_OK;
614         }
615 }
616
617 static int skip_imap_list_l(char **sp, int level)
618 {
619         char *s = *sp;
620
621         for (;;) {
622                 while (isspace((unsigned char)*s))
623                         s++;
624                 if (level && *s == ')') {
625                         s++;
626                         break;
627                 }
628                 if (*s == '(') {
629                         /* sublist */
630                         s++;
631                         if (skip_imap_list_l(&s, level + 1))
632                                 goto bail;
633                 } else if (*s == '"') {
634                         /* quoted string */
635                         s++;
636                         for (; *s != '"'; s++)
637                                 if (!*s)
638                                         goto bail;
639                         s++;
640                 } else {
641                         /* atom */
642                         for (; *s && !isspace((unsigned char)*s); s++)
643                                 if (level && *s == ')')
644                                         break;
645                 }
646
647                 if (!level)
648                         break;
649                 if (!*s)
650                         goto bail;
651         }
652         *sp = s;
653         return 0;
654
655 bail:
656         return -1;
657 }
658
659 static void skip_list(char **sp)
660 {
661         skip_imap_list_l(sp, 0);
662 }
663
664 static void parse_capability(struct imap *imap, char *cmd)
665 {
666         char *arg;
667         unsigned i;
668
669         imap->caps = 0x80000000;
670         while ((arg = next_arg(&cmd)))
671                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
672                         if (!strcmp(cap_list[i], arg))
673                                 imap->caps |= 1 << i;
674         imap->rcaps = imap->caps;
675 }
676
677 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
678                                char *s)
679 {
680         struct imap *imap = ctx->imap;
681         char *arg, *p;
682
683         if (*s != '[')
684                 return RESP_OK;         /* no response code */
685         s++;
686         if (!(p = strchr(s, ']'))) {
687                 fprintf(stderr, "IMAP error: malformed response code\n");
688                 return RESP_BAD;
689         }
690         *p++ = 0;
691         arg = next_arg(&s);
692         if (!strcmp("UIDVALIDITY", arg)) {
693                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
694                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
695                         return RESP_BAD;
696                 }
697         } else if (!strcmp("UIDNEXT", arg)) {
698                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
699                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
700                         return RESP_BAD;
701                 }
702         } else if (!strcmp("CAPABILITY", arg)) {
703                 parse_capability(imap, s);
704         } else if (!strcmp("ALERT", arg)) {
705                 /* RFC2060 says that these messages MUST be displayed
706                  * to the user
707                  */
708                 for (; isspace((unsigned char)*p); p++);
709                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
710         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
711                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
712                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
713                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
714                         return RESP_BAD;
715                 }
716         }
717         return RESP_OK;
718 }
719
720 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
721 {
722         struct imap *imap = ctx->imap;
723         struct imap_cmd *cmdp, **pcmdp;
724         char *cmd, *arg, *arg1;
725         int n, resp, resp2, tag;
726
727         for (;;) {
728                 if (buffer_gets(&imap->buf, &cmd))
729                         return RESP_BAD;
730
731                 arg = next_arg(&cmd);
732                 if (*arg == '*') {
733                         arg = next_arg(&cmd);
734                         if (!arg) {
735                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
736                                 return RESP_BAD;
737                         }
738
739                         if (!strcmp("NAMESPACE", arg)) {
740                                 /* rfc2342 NAMESPACE response. */
741                                 skip_list(&cmd); /* Personal mailboxes */
742                                 skip_list(&cmd); /* Others' mailboxes */
743                                 skip_list(&cmd); /* Shared mailboxes */
744                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
745                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
746                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
747                                         return resp;
748                         } else if (!strcmp("CAPABILITY", arg)) {
749                                 parse_capability(imap, cmd);
750                         } else if ((arg1 = next_arg(&cmd))) {
751                                 ; /*
752                                    * Unhandled response-data with at least two words.
753                                    * Ignore it.
754                                    *
755                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
756                                    * and '<num> RECENT' but as a probably-unintended side
757                                    * effect it ignores other unrecognized two-word
758                                    * responses.  imap-send doesn't ever try to read
759                                    * messages or mailboxes these days, so consider
760                                    * eliminating this case.
761                                    */
762                         } else {
763                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
764                                 return RESP_BAD;
765                         }
766                 } else if (!imap->in_progress) {
767                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
768                         return RESP_BAD;
769                 } else if (*arg == '+') {
770                         /* This can happen only with the last command underway, as
771                            it enforces a round-trip. */
772                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
773                                offsetof(struct imap_cmd, next));
774                         if (cmdp->cb.data) {
775                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
776                                 free(cmdp->cb.data);
777                                 cmdp->cb.data = NULL;
778                                 if (n != (int)cmdp->cb.dlen)
779                                         return RESP_BAD;
780                         } else if (cmdp->cb.cont) {
781                                 if (cmdp->cb.cont(ctx, cmdp, cmd))
782                                         return RESP_BAD;
783                         } else {
784                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
785                                 return RESP_BAD;
786                         }
787                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
788                                 return RESP_BAD;
789                         if (!cmdp->cb.cont)
790                                 imap->literal_pending = 0;
791                         if (!tcmd)
792                                 return DRV_OK;
793                 } else {
794                         tag = atoi(arg);
795                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
796                                 if (cmdp->tag == tag)
797                                         goto gottag;
798                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
799                         return RESP_BAD;
800                 gottag:
801                         if (!(*pcmdp = cmdp->next))
802                                 imap->in_progress_append = pcmdp;
803                         imap->num_in_progress--;
804                         if (cmdp->cb.cont || cmdp->cb.data)
805                                 imap->literal_pending = 0;
806                         arg = next_arg(&cmd);
807                         if (!strcmp("OK", arg))
808                                 resp = DRV_OK;
809                         else {
810                                 if (!strcmp("NO", arg))
811                                         resp = RESP_NO;
812                                 else /*if (!strcmp("BAD", arg))*/
813                                         resp = RESP_BAD;
814                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
815                                         !starts_with(cmdp->cmd, "LOGIN") ?
816                                                         cmdp->cmd : "LOGIN <user> <pass>",
817                                                         arg, cmd ? cmd : "");
818                         }
819                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
820                                 resp = resp2;
821                         if (cmdp->cb.done)
822                                 cmdp->cb.done(ctx, cmdp, resp);
823                         free(cmdp->cb.data);
824                         free(cmdp->cmd);
825                         free(cmdp);
826                         if (!tcmd || tcmd == cmdp)
827                                 return resp;
828                 }
829         }
830         /* not reached */
831 }
832
833 static void imap_close_server(struct imap_store *ictx)
834 {
835         struct imap *imap = ictx->imap;
836
837         if (imap->buf.sock.fd[0] != -1) {
838                 imap_exec(ictx, NULL, "LOGOUT");
839                 socket_shutdown(&imap->buf.sock);
840         }
841         free(imap);
842 }
843
844 static void imap_close_store(struct imap_store *ctx)
845 {
846         imap_close_server(ctx);
847         free(ctx);
848 }
849
850 #ifndef NO_OPENSSL
851
852 /*
853  * hexchar() and cram() functions are based on the code from the isync
854  * project (http://isync.sf.net/).
855  */
856 static char hexchar(unsigned int b)
857 {
858         return b < 10 ? '0' + b : 'a' + (b - 10);
859 }
860
861 #define ENCODED_SIZE(n) (4*((n+2)/3))
862 static char *cram(const char *challenge_64, const char *user, const char *pass)
863 {
864         int i, resp_len, encoded_len, decoded_len;
865         HMAC_CTX hmac;
866         unsigned char hash[16];
867         char hex[33];
868         char *response, *response_64, *challenge;
869
870         /*
871          * length of challenge_64 (i.e. base-64 encoded string) is a good
872          * enough upper bound for challenge (decoded result).
873          */
874         encoded_len = strlen(challenge_64);
875         challenge = xmalloc(encoded_len);
876         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
877                                       (unsigned char *)challenge_64, encoded_len);
878         if (decoded_len < 0)
879                 die("invalid challenge %s", challenge_64);
880         HMAC_Init(&hmac, (unsigned char *)pass, strlen(pass), EVP_md5());
881         HMAC_Update(&hmac, (unsigned char *)challenge, decoded_len);
882         HMAC_Final(&hmac, hash, NULL);
883         HMAC_CTX_cleanup(&hmac);
884
885         hex[32] = 0;
886         for (i = 0; i < 16; i++) {
887                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
888                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
889         }
890
891         /* response: "<user> <digest in hex>" */
892         response = xstrfmt("%s %s", user, hex);
893         resp_len = strlen(response) + 1;
894
895         response_64 = xmallocz(ENCODED_SIZE(resp_len));
896         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
897                                       (unsigned char *)response, resp_len);
898         if (encoded_len < 0)
899                 die("EVP_EncodeBlock error");
900         return (char *)response_64;
901 }
902
903 #else
904
905 static char *cram(const char *challenge_64, const char *user, const char *pass)
906 {
907         die("If you want to use CRAM-MD5 authenticate method, "
908             "you have to build git-imap-send with OpenSSL library.");
909 }
910
911 #endif
912
913 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
914 {
915         int ret;
916         char *response;
917
918         response = cram(prompt, server.user, server.pass);
919
920         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
921         if (ret != strlen(response))
922                 return error("IMAP error: sending response failed");
923
924         free(response);
925
926         return 0;
927 }
928
929 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
930 {
931         struct credential cred = CREDENTIAL_INIT;
932         struct imap_store *ctx;
933         struct imap *imap;
934         char *arg, *rsp;
935         int s = -1, preauth;
936
937         ctx = xcalloc(1, sizeof(*ctx));
938
939         ctx->imap = imap = xcalloc(1, sizeof(*imap));
940         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
941         imap->in_progress_append = &imap->in_progress;
942
943         /* open connection to IMAP server */
944
945         if (srvc->tunnel) {
946                 struct child_process tunnel = CHILD_PROCESS_INIT;
947
948                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
949
950                 argv_array_push(&tunnel.args, srvc->tunnel);
951                 tunnel.use_shell = 1;
952                 tunnel.in = -1;
953                 tunnel.out = -1;
954                 if (start_command(&tunnel))
955                         die("cannot start proxy %s", srvc->tunnel);
956
957                 imap->buf.sock.fd[0] = tunnel.out;
958                 imap->buf.sock.fd[1] = tunnel.in;
959
960                 imap_info("ok\n");
961         } else {
962 #ifndef NO_IPV6
963                 struct addrinfo hints, *ai0, *ai;
964                 int gai;
965                 char portstr[6];
966
967                 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
968
969                 memset(&hints, 0, sizeof(hints));
970                 hints.ai_socktype = SOCK_STREAM;
971                 hints.ai_protocol = IPPROTO_TCP;
972
973                 imap_info("Resolving %s... ", srvc->host);
974                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
975                 if (gai) {
976                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
977                         goto bail;
978                 }
979                 imap_info("ok\n");
980
981                 for (ai0 = ai; ai; ai = ai->ai_next) {
982                         char addr[NI_MAXHOST];
983
984                         s = socket(ai->ai_family, ai->ai_socktype,
985                                    ai->ai_protocol);
986                         if (s < 0)
987                                 continue;
988
989                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
990                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
991                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
992
993                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
994                                 close(s);
995                                 s = -1;
996                                 perror("connect");
997                                 continue;
998                         }
999
1000                         break;
1001                 }
1002                 freeaddrinfo(ai0);
1003 #else /* NO_IPV6 */
1004                 struct hostent *he;
1005                 struct sockaddr_in addr;
1006
1007                 memset(&addr, 0, sizeof(addr));
1008                 addr.sin_port = htons(srvc->port);
1009                 addr.sin_family = AF_INET;
1010
1011                 imap_info("Resolving %s... ", srvc->host);
1012                 he = gethostbyname(srvc->host);
1013                 if (!he) {
1014                         perror("gethostbyname");
1015                         goto bail;
1016                 }
1017                 imap_info("ok\n");
1018
1019                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1020
1021                 s = socket(PF_INET, SOCK_STREAM, 0);
1022
1023                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1024                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1025                         close(s);
1026                         s = -1;
1027                         perror("connect");
1028                 }
1029 #endif
1030                 if (s < 0) {
1031                         fputs("Error: unable to connect to server.\n", stderr);
1032                         goto bail;
1033                 }
1034
1035                 imap->buf.sock.fd[0] = s;
1036                 imap->buf.sock.fd[1] = dup(s);
1037
1038                 if (srvc->use_ssl &&
1039                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1040                         close(s);
1041                         goto bail;
1042                 }
1043                 imap_info("ok\n");
1044         }
1045
1046         /* read the greeting string */
1047         if (buffer_gets(&imap->buf, &rsp)) {
1048                 fprintf(stderr, "IMAP error: no greeting response\n");
1049                 goto bail;
1050         }
1051         arg = next_arg(&rsp);
1052         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1053                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1054                 goto bail;
1055         }
1056         preauth = 0;
1057         if (!strcmp("PREAUTH", arg))
1058                 preauth = 1;
1059         else if (strcmp("OK", arg) != 0) {
1060                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1061                 goto bail;
1062         }
1063         parse_response_code(ctx, NULL, rsp);
1064         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1065                 goto bail;
1066
1067         if (!preauth) {
1068 #ifndef NO_OPENSSL
1069                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1070                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1071                                 goto bail;
1072                         if (ssl_socket_connect(&imap->buf.sock, 1,
1073                                                srvc->ssl_verify))
1074                                 goto bail;
1075                         /* capabilities may have changed, so get the new capabilities */
1076                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1077                                 goto bail;
1078                 }
1079 #endif
1080                 imap_info("Logging in...\n");
1081                 if (!srvc->user || !srvc->pass) {
1082                         cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1083                         cred.host = xstrdup(srvc->host);
1084
1085                         if (srvc->user)
1086                                 cred.username = xstrdup(srvc->user);
1087                         if (srvc->pass)
1088                                 cred.password = xstrdup(srvc->pass);
1089
1090                         credential_fill(&cred);
1091
1092                         if (!srvc->user)
1093                                 srvc->user = xstrdup(cred.username);
1094                         if (!srvc->pass)
1095                                 srvc->pass = xstrdup(cred.password);
1096                 }
1097
1098                 if (CAP(NOLOGIN)) {
1099                         fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1100                         goto bail;
1101                 }
1102
1103                 if (srvc->auth_method) {
1104                         struct imap_cmd_cb cb;
1105
1106                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1107                                 if (!CAP(AUTH_CRAM_MD5)) {
1108                                         fprintf(stderr, "You specified"
1109                                                 "CRAM-MD5 as authentication method, "
1110                                                 "but %s doesn't support it.\n", srvc->host);
1111                                         goto bail;
1112                                 }
1113                                 /* CRAM-MD5 */
1114
1115                                 memset(&cb, 0, sizeof(cb));
1116                                 cb.cont = auth_cram_md5;
1117                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1118                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1119                                         goto bail;
1120                                 }
1121                         } else {
1122                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1123                                 goto bail;
1124                         }
1125                 } else {
1126                         if (!imap->buf.sock.ssl)
1127                                 imap_warn("*** IMAP Warning *** Password is being "
1128                                           "sent in the clear\n");
1129                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1130                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1131                                 goto bail;
1132                         }
1133                 }
1134         } /* !preauth */
1135
1136         if (cred.username)
1137                 credential_approve(&cred);
1138         credential_clear(&cred);
1139
1140         /* check the target mailbox exists */
1141         ctx->name = folder;
1142         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1143         case RESP_OK:
1144                 /* ok */
1145                 break;
1146         case RESP_BAD:
1147                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1148                 goto out;
1149         case RESP_NO:
1150                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1151                         imap_info("Created missing mailbox\n");
1152                 } else {
1153                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1154                         goto out;
1155                 }
1156                 break;
1157         }
1158
1159         ctx->prefix = "";
1160         return ctx;
1161
1162 bail:
1163         if (cred.username)
1164                 credential_reject(&cred);
1165         credential_clear(&cred);
1166
1167  out:
1168         imap_close_store(ctx);
1169         return NULL;
1170 }
1171
1172 /*
1173  * Insert CR characters as necessary in *msg to ensure that every LF
1174  * character in *msg is preceded by a CR.
1175  */
1176 static void lf_to_crlf(struct strbuf *msg)
1177 {
1178         char *new;
1179         size_t i, j;
1180         char lastc;
1181
1182         /* First pass: tally, in j, the size of the new string: */
1183         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1184                 if (msg->buf[i] == '\n' && lastc != '\r')
1185                         j++; /* a CR will need to be added here */
1186                 lastc = msg->buf[i];
1187                 j++;
1188         }
1189
1190         new = xmallocz(j);
1191
1192         /*
1193          * Second pass: write the new string.  Note that this loop is
1194          * otherwise identical to the first pass.
1195          */
1196         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1197                 if (msg->buf[i] == '\n' && lastc != '\r')
1198                         new[j++] = '\r';
1199                 lastc = new[j++] = msg->buf[i];
1200         }
1201         strbuf_attach(msg, new, j, j + 1);
1202 }
1203
1204 /*
1205  * Store msg to IMAP.  Also detach and free the data from msg->data,
1206  * leaving msg->data empty.
1207  */
1208 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1209 {
1210         struct imap *imap = ctx->imap;
1211         struct imap_cmd_cb cb;
1212         const char *prefix, *box;
1213         int ret;
1214
1215         lf_to_crlf(msg);
1216         memset(&cb, 0, sizeof(cb));
1217
1218         cb.dlen = msg->len;
1219         cb.data = strbuf_detach(msg, NULL);
1220
1221         box = ctx->name;
1222         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1223         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1224         imap->caps = imap->rcaps;
1225         if (ret != DRV_OK)
1226                 return ret;
1227
1228         return DRV_OK;
1229 }
1230
1231 static void wrap_in_html(struct strbuf *msg)
1232 {
1233         struct strbuf buf = STRBUF_INIT;
1234         static char *content_type = "Content-Type: text/html;\n";
1235         static char *pre_open = "<pre>\n";
1236         static char *pre_close = "</pre>\n";
1237         const char *body = strstr(msg->buf, "\n\n");
1238
1239         if (!body)
1240                 return; /* Headers but no body; no wrapping needed */
1241
1242         body += 2;
1243
1244         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1245         strbuf_addstr(&buf, content_type);
1246         strbuf_addch(&buf, '\n');
1247         strbuf_addstr(&buf, pre_open);
1248         strbuf_addstr_xml_quoted(&buf, body);
1249         strbuf_addstr(&buf, pre_close);
1250
1251         strbuf_release(msg);
1252         *msg = buf;
1253 }
1254
1255 #define CHUNKSIZE 0x1000
1256
1257 static int read_message(FILE *f, struct strbuf *all_msgs)
1258 {
1259         do {
1260                 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1261                         break;
1262         } while (!feof(f));
1263
1264         return ferror(f) ? -1 : 0;
1265 }
1266
1267 static int count_messages(struct strbuf *all_msgs)
1268 {
1269         int count = 0;
1270         char *p = all_msgs->buf;
1271
1272         while (1) {
1273                 if (starts_with(p, "From ")) {
1274                         p = strstr(p+5, "\nFrom: ");
1275                         if (!p) break;
1276                         p = strstr(p+7, "\nDate: ");
1277                         if (!p) break;
1278                         p = strstr(p+7, "\nSubject: ");
1279                         if (!p) break;
1280                         p += 10;
1281                         count++;
1282                 }
1283                 p = strstr(p+5, "\nFrom ");
1284                 if (!p)
1285                         break;
1286                 p++;
1287         }
1288         return count;
1289 }
1290
1291 /*
1292  * Copy the next message from all_msgs, starting at offset *ofs, to
1293  * msg.  Update *ofs to the start of the following message.  Return
1294  * true iff a message was successfully copied.
1295  */
1296 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1297 {
1298         char *p, *data;
1299         size_t len;
1300
1301         if (*ofs >= all_msgs->len)
1302                 return 0;
1303
1304         data = &all_msgs->buf[*ofs];
1305         len = all_msgs->len - *ofs;
1306
1307         if (len < 5 || !starts_with(data, "From "))
1308                 return 0;
1309
1310         p = strchr(data, '\n');
1311         if (p) {
1312                 p++;
1313                 len -= p - data;
1314                 *ofs += p - data;
1315                 data = p;
1316         }
1317
1318         p = strstr(data, "\nFrom ");
1319         if (p)
1320                 len = &p[1] - data;
1321
1322         strbuf_add(msg, data, len);
1323         *ofs += len;
1324         return 1;
1325 }
1326
1327 static void git_imap_config(void)
1328 {
1329         const char *val = NULL;
1330
1331         git_config_get_bool("imap.sslverify", &server.ssl_verify);
1332         git_config_get_bool("imap.preformattedhtml", &server.use_html);
1333         git_config_get_string("imap.folder", &server.folder);
1334
1335         if (!git_config_get_value("imap.host", &val)) {
1336                 if (!val) {
1337                         git_die_config("imap.host", "Missing value for 'imap.host'");
1338                 } else {
1339                         if (starts_with(val, "imap:"))
1340                                 val += 5;
1341                         else if (starts_with(val, "imaps:")) {
1342                                 val += 6;
1343                                 server.use_ssl = 1;
1344                         }
1345                         if (starts_with(val, "//"))
1346                                 val += 2;
1347                         server.host = xstrdup(val);
1348                 }
1349         }
1350
1351         git_config_get_string("imap.user", &server.user);
1352         git_config_get_string("imap.pass", &server.pass);
1353         git_config_get_int("imap.port", &server.port);
1354         git_config_get_string("imap.tunnel", &server.tunnel);
1355         git_config_get_string("imap.authmethod", &server.auth_method);
1356 }
1357
1358 static int append_msgs_to_imap(struct imap_server_conf *server,
1359                                struct strbuf* all_msgs, int total)
1360 {
1361         struct strbuf msg = STRBUF_INIT;
1362         struct imap_store *ctx = NULL;
1363         int ofs = 0;
1364         int r;
1365         int n = 0;
1366
1367         ctx = imap_open_store(server, server->folder);
1368         if (!ctx) {
1369                 fprintf(stderr, "failed to open store\n");
1370                 return 1;
1371         }
1372         ctx->name = server->folder;
1373
1374         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1375         while (1) {
1376                 unsigned percent = n * 100 / total;
1377
1378                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1379
1380                 if (!split_msg(all_msgs, &msg, &ofs))
1381                         break;
1382                 if (server->use_html)
1383                         wrap_in_html(&msg);
1384                 r = imap_store_msg(ctx, &msg);
1385                 if (r != DRV_OK)
1386                         break;
1387                 n++;
1388         }
1389         fprintf(stderr, "\n");
1390
1391         imap_close_store(ctx);
1392
1393         return 0;
1394 }
1395
1396 #ifdef USE_CURL_FOR_IMAP_SEND
1397 static CURL *setup_curl(struct imap_server_conf *srvc)
1398 {
1399         CURL *curl;
1400         struct strbuf path = STRBUF_INIT;
1401
1402         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1403                 die("curl_global_init failed");
1404
1405         curl = curl_easy_init();
1406
1407         if (!curl)
1408                 die("curl_easy_init failed");
1409
1410         curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
1411         curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
1412
1413         strbuf_addstr(&path, server.host);
1414         if (!path.len || path.buf[path.len - 1] != '/')
1415                 strbuf_addch(&path, '/');
1416         strbuf_addstr(&path, server.folder);
1417
1418         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1419         strbuf_release(&path);
1420         curl_easy_setopt(curl, CURLOPT_PORT, server.port);
1421
1422         if (server.auth_method) {
1423 #if LIBCURL_VERSION_NUM < 0x072200
1424                 warning("No LOGIN_OPTIONS support in this cURL version");
1425 #else
1426                 struct strbuf auth = STRBUF_INIT;
1427                 strbuf_addstr(&auth, "AUTH=");
1428                 strbuf_addstr(&auth, server.auth_method);
1429                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1430                 strbuf_release(&auth);
1431 #endif
1432         }
1433
1434         if (!server.use_ssl)
1435                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1436
1437         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
1438         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
1439
1440         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1441
1442         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1443
1444         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1445                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
1446
1447         return curl;
1448 }
1449
1450 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1451                                     struct strbuf* all_msgs, int total) {
1452         int ofs = 0;
1453         int n = 0;
1454         struct buffer msgbuf = { STRBUF_INIT, 0 };
1455         CURL *curl;
1456         CURLcode res = CURLE_OK;
1457
1458         curl = setup_curl(server);
1459         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1460
1461         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1462         while (1) {
1463                 unsigned percent = n * 100 / total;
1464                 int prev_len;
1465
1466                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1467
1468                 prev_len = msgbuf.buf.len;
1469                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1470                         break;
1471                 if (server->use_html)
1472                         wrap_in_html(&msgbuf.buf);
1473                 lf_to_crlf(&msgbuf.buf);
1474
1475                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1476                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1477
1478                 res = curl_easy_perform(curl);
1479
1480                 if(res != CURLE_OK) {
1481                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1482                                         curl_easy_strerror(res));
1483                         break;
1484                 }
1485
1486                 n++;
1487         }
1488         fprintf(stderr, "\n");
1489
1490         curl_easy_cleanup(curl);
1491         curl_global_cleanup();
1492
1493         return 0;
1494 }
1495 #endif
1496
1497 int main(int argc, char **argv)
1498 {
1499         struct strbuf all_msgs = STRBUF_INIT;
1500         int total;
1501         int nongit_ok;
1502
1503         git_extract_argv0_path(argv[0]);
1504
1505         git_setup_gettext();
1506
1507         setup_git_directory_gently(&nongit_ok);
1508         git_imap_config();
1509
1510         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1511
1512         if (argc)
1513                 usage_with_options(imap_send_usage, imap_send_options);
1514
1515 #ifndef USE_CURL_FOR_IMAP_SEND
1516         if (use_curl) {
1517                 warning("--curl not supported in this build");
1518                 use_curl = 0;
1519         }
1520 #elif defined(NO_OPENSSL)
1521         if (!use_curl) {
1522                 warning("--no-curl not supported in this build");
1523                 use_curl = 1;
1524         }
1525 #endif
1526
1527         if (!server.port)
1528                 server.port = server.use_ssl ? 993 : 143;
1529
1530         if (!server.folder) {
1531                 fprintf(stderr, "no imap store specified\n");
1532                 return 1;
1533         }
1534         if (!server.host) {
1535                 if (!server.tunnel) {
1536                         fprintf(stderr, "no imap host specified\n");
1537                         return 1;
1538                 }
1539                 server.host = "tunnel";
1540         }
1541
1542         /* read the messages */
1543         if (read_message(stdin, &all_msgs)) {
1544                 fprintf(stderr, "error reading input\n");
1545                 return 1;
1546         }
1547
1548         if (all_msgs.len == 0) {
1549                 fprintf(stderr, "nothing to send\n");
1550                 return 1;
1551         }
1552
1553         total = count_messages(&all_msgs);
1554         if (!total) {
1555                 fprintf(stderr, "no messages to send\n");
1556                 return 1;
1557         }
1558
1559         /* write it to the imap server */
1560
1561         if (server.tunnel)
1562                 return append_msgs_to_imap(&server, &all_msgs, total);
1563
1564 #ifdef USE_CURL_FOR_IMAP_SEND
1565         if (use_curl)
1566                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1567 #endif
1568
1569         return append_msgs_to_imap(&server, &all_msgs, total);
1570 }