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   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         resp_len = strlen(user) + 1 + strlen(hex) + 1;
 893         response = xmalloc(resp_len);
 894         sprintf(response, "%s %s", user, hex);
 895
 896         response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
 897         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 898                                       (unsigned char *)response, resp_len);
 899         if (encoded_len < 0)
 900                 die("EVP_EncodeBlock error");
 901         response_64[encoded_len] = '\0';
 902         return (char *)response_64;
 903 }
 904
 905 #else
 906
 907 static char *cram(const char *challenge_64, const char *user, const char *pass)
 908 {
 909         die("If you want to use CRAM-MD5 authenticate method, "
 910             "you have to build git-imap-send with OpenSSL library.");
 911 }
 912
 913 #endif
 914
 915 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
 916 {
 917         int ret;
 918         char *response;
 919
 920         response = cram(prompt, server.user, server.pass);
 921
 922         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 923         if (ret != strlen(response))
 924                 return error("IMAP error: sending response failed");
 925
 926         free(response);
 927
 928         return 0;
 929 }
 930
 931 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
 932 {
 933         struct credential cred = CREDENTIAL_INIT;
 934         struct imap_store *ctx;
 935         struct imap *imap;
 936         char *arg, *rsp;
 937         int s = -1, preauth;
 938
 939         ctx = xcalloc(1, sizeof(*ctx));
 940
 941         ctx->imap = imap = xcalloc(1, sizeof(*imap));
 942         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 943         imap->in_progress_append = &imap->in_progress;
 944
 945         /* open connection to IMAP server */
 946
 947         if (srvc->tunnel) {
 948                 struct child_process tunnel = CHILD_PROCESS_INIT;
 949
 950                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 951
 952                 argv_array_push(&tunnel.args, srvc->tunnel);
 953                 tunnel.use_shell = 1;
 954                 tunnel.in = -1;
 955                 tunnel.out = -1;
 956                 if (start_command(&tunnel))
 957                         die("cannot start proxy %s", srvc->tunnel);
 958
 959                 imap->buf.sock.fd[0] = tunnel.out;
 960                 imap->buf.sock.fd[1] = tunnel.in;
 961
 962                 imap_info("ok\n");
 963         } else {
 964 #ifndef NO_IPV6
 965                 struct addrinfo hints, *ai0, *ai;
 966                 int gai;
 967                 char portstr[6];
 968
 969                 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
 970
 971                 memset(&hints, 0, sizeof(hints));
 972                 hints.ai_socktype = SOCK_STREAM;
 973                 hints.ai_protocol = IPPROTO_TCP;
 974
 975                 imap_info("Resolving %s... ", srvc->host);
 976                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 977                 if (gai) {
 978                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 979                         goto bail;
 980                 }
 981                 imap_info("ok\n");
 982
 983                 for (ai0 = ai; ai; ai = ai->ai_next) {
 984                         char addr[NI_MAXHOST];
 985
 986                         s = socket(ai->ai_family, ai->ai_socktype,
 987                                    ai->ai_protocol);
 988                         if (s < 0)
 989                                 continue;
 990
 991                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
 992                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
 993                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
 994
 995                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 996                                 close(s);
 997                                 s = -1;
 998                                 perror("connect");
 999                                 continue;
1000                         }
1001
1002                         break;
1003                 }
1004                 freeaddrinfo(ai0);
1005 #else /* NO_IPV6 */
1006                 struct hostent *he;
1007                 struct sockaddr_in addr;
1008
1009                 memset(&addr, 0, sizeof(addr));
1010                 addr.sin_port = htons(srvc->port);
1011                 addr.sin_family = AF_INET;
1012
1013                 imap_info("Resolving %s... ", srvc->host);
1014                 he = gethostbyname(srvc->host);
1015                 if (!he) {
1016                         perror("gethostbyname");
1017                         goto bail;
1018                 }
1019                 imap_info("ok\n");
1020
1021                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1022
1023                 s = socket(PF_INET, SOCK_STREAM, 0);
1024
1025                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1026                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1027                         close(s);
1028                         s = -1;
1029                         perror("connect");
1030                 }
1031 #endif
1032                 if (s < 0) {
1033                         fputs("Error: unable to connect to server.\n", stderr);
1034                         goto bail;
1035                 }
1036
1037                 imap->buf.sock.fd[0] = s;
1038                 imap->buf.sock.fd[1] = dup(s);
1039
1040                 if (srvc->use_ssl &&
1041                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1042                         close(s);
1043                         goto bail;
1044                 }
1045                 imap_info("ok\n");
1046         }
1047
1048         /* read the greeting string */
1049         if (buffer_gets(&imap->buf, &rsp)) {
1050                 fprintf(stderr, "IMAP error: no greeting response\n");
1051                 goto bail;
1052         }
1053         arg = next_arg(&rsp);
1054         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1055                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1056                 goto bail;
1057         }
1058         preauth = 0;
1059         if (!strcmp("PREAUTH", arg))
1060                 preauth = 1;
1061         else if (strcmp("OK", arg) != 0) {
1062                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1063                 goto bail;
1064         }
1065         parse_response_code(ctx, NULL, rsp);
1066         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1067                 goto bail;
1068
1069         if (!preauth) {
1070 #ifndef NO_OPENSSL
1071                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1072                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1073                                 goto bail;
1074                         if (ssl_socket_connect(&imap->buf.sock, 1,
1075                                                srvc->ssl_verify))
1076                                 goto bail;
1077                         /* capabilities may have changed, so get the new capabilities */
1078                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1079                                 goto bail;
1080                 }
1081 #endif
1082                 imap_info("Logging in...\n");
1083                 if (!srvc->user || !srvc->pass) {
1084                         cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1085                         cred.host = xstrdup(srvc->host);
1086
1087                         if (srvc->user)
1088                                 cred.username = xstrdup(srvc->user);
1089                         if (srvc->pass)
1090                                 cred.password = xstrdup(srvc->pass);
1091
1092                         credential_fill(&cred);
1093
1094                         if (!srvc->user)
1095                                 srvc->user = xstrdup(cred.username);
1096                         if (!srvc->pass)
1097                                 srvc->pass = xstrdup(cred.password);
1098                 }
1099
1100                 if (CAP(NOLOGIN)) {
1101                         fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1102                         goto bail;
1103                 }
1104
1105                 if (srvc->auth_method) {
1106                         struct imap_cmd_cb cb;
1107
1108                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1109                                 if (!CAP(AUTH_CRAM_MD5)) {
1110                                         fprintf(stderr, "You specified"
1111                                                 "CRAM-MD5 as authentication method, "
1112                                                 "but %s doesn't support it.\n", srvc->host);
1113                                         goto bail;
1114                                 }
1115                                 /* CRAM-MD5 */
1116
1117                                 memset(&cb, 0, sizeof(cb));
1118                                 cb.cont = auth_cram_md5;
1119                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1120                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1121                                         goto bail;
1122                                 }
1123                         } else {
1124                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1125                                 goto bail;
1126                         }
1127                 } else {
1128                         if (!imap->buf.sock.ssl)
1129                                 imap_warn("*** IMAP Warning *** Password is being "
1130                                           "sent in the clear\n");
1131                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1132                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1133                                 goto bail;
1134                         }
1135                 }
1136         } /* !preauth */
1137
1138         if (cred.username)
1139                 credential_approve(&cred);
1140         credential_clear(&cred);
1141
1142         /* check the target mailbox exists */
1143         ctx->name = folder;
1144         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1145         case RESP_OK:
1146                 /* ok */
1147                 break;
1148         case RESP_BAD:
1149                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1150                 goto out;
1151         case RESP_NO:
1152                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1153                         imap_info("Created missing mailbox\n");
1154                 } else {
1155                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1156                         goto out;
1157                 }
1158                 break;
1159         }
1160
1161         ctx->prefix = "";
1162         return ctx;
1163
1164 bail:
1165         if (cred.username)
1166                 credential_reject(&cred);
1167         credential_clear(&cred);
1168
1169  out:
1170         imap_close_store(ctx);
1171         return NULL;
1172 }
1173
1174 /*
1175  * Insert CR characters as necessary in *msg to ensure that every LF
1176  * character in *msg is preceded by a CR.
1177  */
1178 static void lf_to_crlf(struct strbuf *msg)
1179 {
1180         char *new;
1181         size_t i, j;
1182         char lastc;
1183
1184         /* First pass: tally, in j, the size of the new string: */
1185         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1186                 if (msg->buf[i] == '\n' && lastc != '\r')
1187                         j++; /* a CR will need to be added here */
1188                 lastc = msg->buf[i];
1189                 j++;
1190         }
1191
1192         new = xmalloc(j + 1);
1193
1194         /*
1195          * Second pass: write the new string.  Note that this loop is
1196          * otherwise identical to the first pass.
1197          */
1198         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1199                 if (msg->buf[i] == '\n' && lastc != '\r')
1200                         new[j++] = '\r';
1201                 lastc = new[j++] = msg->buf[i];
1202         }
1203         strbuf_attach(msg, new, j, j + 1);
1204 }
1205
1206 /*
1207  * Store msg to IMAP.  Also detach and free the data from msg->data,
1208  * leaving msg->data empty.
1209  */
1210 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1211 {
1212         struct imap *imap = ctx->imap;
1213         struct imap_cmd_cb cb;
1214         const char *prefix, *box;
1215         int ret;
1216
1217         lf_to_crlf(msg);
1218         memset(&cb, 0, sizeof(cb));
1219
1220         cb.dlen = msg->len;
1221         cb.data = strbuf_detach(msg, NULL);
1222
1223         box = ctx->name;
1224         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1225         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1226         imap->caps = imap->rcaps;
1227         if (ret != DRV_OK)
1228                 return ret;
1229
1230         return DRV_OK;
1231 }
1232
1233 static void wrap_in_html(struct strbuf *msg)
1234 {
1235         struct strbuf buf = STRBUF_INIT;
1236         static char *content_type = "Content-Type: text/html;\n";
1237         static char *pre_open = "<pre>\n";
1238         static char *pre_close = "</pre>\n";
1239         const char *body = strstr(msg->buf, "\n\n");
1240
1241         if (!body)
1242                 return; /* Headers but no body; no wrapping needed */
1243
1244         body += 2;
1245
1246         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1247         strbuf_addstr(&buf, content_type);
1248         strbuf_addch(&buf, '\n');
1249         strbuf_addstr(&buf, pre_open);
1250         strbuf_addstr_xml_quoted(&buf, body);
1251         strbuf_addstr(&buf, pre_close);
1252
1253         strbuf_release(msg);
1254         *msg = buf;
1255 }
1256
1257 #define CHUNKSIZE 0x1000
1258
1259 static int read_message(FILE *f, struct strbuf *all_msgs)
1260 {
1261         do {
1262                 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1263                         break;
1264         } while (!feof(f));
1265
1266         return ferror(f) ? -1 : 0;
1267 }
1268
1269 static int count_messages(struct strbuf *all_msgs)
1270 {
1271         int count = 0;
1272         char *p = all_msgs->buf;
1273
1274         while (1) {
1275                 if (starts_with(p, "From ")) {
1276                         p = strstr(p+5, "\nFrom: ");
1277                         if (!p) break;
1278                         p = strstr(p+7, "\nDate: ");
1279                         if (!p) break;
1280                         p = strstr(p+7, "\nSubject: ");
1281                         if (!p) break;
1282                         p += 10;
1283                         count++;
1284                 }
1285                 p = strstr(p+5, "\nFrom ");
1286                 if (!p)
1287                         break;
1288                 p++;
1289         }
1290         return count;
1291 }
1292
1293 /*
1294  * Copy the next message from all_msgs, starting at offset *ofs, to
1295  * msg.  Update *ofs to the start of the following message.  Return
1296  * true iff a message was successfully copied.
1297  */
1298 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1299 {
1300         char *p, *data;
1301         size_t len;
1302
1303         if (*ofs >= all_msgs->len)
1304                 return 0;
1305
1306         data = &all_msgs->buf[*ofs];
1307         len = all_msgs->len - *ofs;
1308
1309         if (len < 5 || !starts_with(data, "From "))
1310                 return 0;
1311
1312         p = strchr(data, '\n');
1313         if (p) {
1314                 p++;
1315                 len -= p - data;
1316                 *ofs += p - data;
1317                 data = p;
1318         }
1319
1320         p = strstr(data, "\nFrom ");
1321         if (p)
1322                 len = &p[1] - data;
1323
1324         strbuf_add(msg, data, len);
1325         *ofs += len;
1326         return 1;
1327 }
1328
1329 static void git_imap_config(void)
1330 {
1331         const char *val = NULL;
1332
1333         git_config_get_bool("imap.sslverify", &server.ssl_verify);
1334         git_config_get_bool("imap.preformattedhtml", &server.use_html);
1335         git_config_get_string("imap.folder", &server.folder);
1336
1337         if (!git_config_get_value("imap.host", &val)) {
1338                 if (!val) {
1339                         git_die_config("imap.host", "Missing value for 'imap.host'");
1340                 } else {
1341                         if (starts_with(val, "imap:"))
1342                                 val += 5;
1343                         else if (starts_with(val, "imaps:")) {
1344                                 val += 6;
1345                                 server.use_ssl = 1;
1346                         }
1347                         if (starts_with(val, "//"))
1348                                 val += 2;
1349                         server.host = xstrdup(val);
1350                 }
1351         }
1352
1353         git_config_get_string("imap.user", &server.user);
1354         git_config_get_string("imap.pass", &server.pass);
1355         git_config_get_int("imap.port", &server.port);
1356         git_config_get_string("imap.tunnel", &server.tunnel);
1357         git_config_get_string("imap.authmethod", &server.auth_method);
1358 }
1359
1360 static int append_msgs_to_imap(struct imap_server_conf *server,
1361                                struct strbuf* all_msgs, int total)
1362 {
1363         struct strbuf msg = STRBUF_INIT;
1364         struct imap_store *ctx = NULL;
1365         int ofs = 0;
1366         int r;
1367         int n = 0;
1368
1369         ctx = imap_open_store(server, server->folder);
1370         if (!ctx) {
1371                 fprintf(stderr, "failed to open store\n");
1372                 return 1;
1373         }
1374         ctx->name = server->folder;
1375
1376         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1377         while (1) {
1378                 unsigned percent = n * 100 / total;
1379
1380                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1381
1382                 if (!split_msg(all_msgs, &msg, &ofs))
1383                         break;
1384                 if (server->use_html)
1385                         wrap_in_html(&msg);
1386                 r = imap_store_msg(ctx, &msg);
1387                 if (r != DRV_OK)
1388                         break;
1389                 n++;
1390         }
1391         fprintf(stderr, "\n");
1392
1393         imap_close_store(ctx);
1394
1395         return 0;
1396 }
1397
1398 #ifdef USE_CURL_FOR_IMAP_SEND
1399 static CURL *setup_curl(struct imap_server_conf *srvc)
1400 {
1401         CURL *curl;
1402         struct strbuf path = STRBUF_INIT;
1403
1404         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1405                 die("curl_global_init failed");
1406
1407         curl = curl_easy_init();
1408
1409         if (!curl)
1410                 die("curl_easy_init failed");
1411
1412         curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
1413         curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
1414
1415         strbuf_addstr(&path, server.host);
1416         if (!path.len || path.buf[path.len - 1] != '/')
1417                 strbuf_addch(&path, '/');
1418         strbuf_addstr(&path, server.folder);
1419
1420         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1421         strbuf_release(&path);
1422         curl_easy_setopt(curl, CURLOPT_PORT, server.port);
1423
1424         if (server.auth_method) {
1425                 struct strbuf auth = STRBUF_INIT;
1426                 strbuf_addstr(&auth, "AUTH=");
1427                 strbuf_addstr(&auth, server.auth_method);
1428                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1429                 strbuf_release(&auth);
1430         }
1431
1432         if (!server.use_ssl)
1433                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1434
1435         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
1436         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
1437
1438         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1439
1440         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1441
1442         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1443                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
1444
1445         return curl;
1446 }
1447
1448 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1449                                     struct strbuf* all_msgs, int total) {
1450         int ofs = 0;
1451         int n = 0;
1452         struct buffer msgbuf = { STRBUF_INIT, 0 };
1453         CURL *curl;
1454         CURLcode res = CURLE_OK;
1455
1456         curl = setup_curl(server);
1457         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1458
1459         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1460         while (1) {
1461                 unsigned percent = n * 100 / total;
1462                 int prev_len;
1463
1464                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1465
1466                 prev_len = msgbuf.buf.len;
1467                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1468                         break;
1469                 if (server->use_html)
1470                         wrap_in_html(&msgbuf.buf);
1471                 lf_to_crlf(&msgbuf.buf);
1472
1473                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1474                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1475
1476                 res = curl_easy_perform(curl);
1477
1478                 if(res != CURLE_OK) {
1479                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1480                                         curl_easy_strerror(res));
1481                         break;
1482                 }
1483
1484                 n++;
1485         }
1486         fprintf(stderr, "\n");
1487
1488         curl_easy_cleanup(curl);
1489         curl_global_cleanup();
1490
1491         return 0;
1492 }
1493 #endif
1494
1495 int main(int argc, char **argv)
1496 {
1497         struct strbuf all_msgs = STRBUF_INIT;
1498         int total;
1499         int nongit_ok;
1500
1501         git_extract_argv0_path(argv[0]);
1502
1503         git_setup_gettext();
1504
1505         setup_git_directory_gently(&nongit_ok);
1506         git_imap_config();
1507
1508         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1509
1510         if (argc)
1511                 usage_with_options(imap_send_usage, imap_send_options);
1512
1513 #ifndef USE_CURL_FOR_IMAP_SEND
1514         if (use_curl) {
1515                 warning("--curl not supported in this build");
1516                 use_curl = 0;
1517         }
1518 #elif defined(NO_OPENSSL)
1519         if (!use_curl) {
1520                 warning("--no-curl not supported in this build");
1521                 use_curl = 1;
1522         }
1523 #endif
1524
1525         if (!server.port)
1526                 server.port = server.use_ssl ? 993 : 143;
1527
1528         if (!server.folder) {
1529                 fprintf(stderr, "no imap store specified\n");
1530                 return 1;
1531         }
1532         if (!server.host) {
1533                 if (!server.tunnel) {
1534                         fprintf(stderr, "no imap host specified\n");
1535                         return 1;
1536                 }
1537                 server.host = "tunnel";
1538         }
1539
1540         /* read the messages */
1541         if (read_message(stdin, &all_msgs)) {
1542                 fprintf(stderr, "error reading input\n");
1543                 return 1;
1544         }
1545
1546         if (all_msgs.len == 0) {
1547                 fprintf(stderr, "nothing to send\n");
1548                 return 1;
1549         }
1550
1551         total = count_messages(&all_msgs);
1552         if (!total) {
1553                 fprintf(stderr, "no messages to send\n");
1554                 return 1;
1555         }
1556
1557         /* write it to the imap server */
1558
1559         if (server.tunnel)
1560                 return append_msgs_to_imap(&server, &all_msgs, total);
1561
1562 #ifdef USE_CURL_FOR_IMAP_SEND
1563         if (use_curl)
1564                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1565 #endif
1566
1567         return append_msgs_to_imap(&server, &all_msgs, total);
1568 }