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