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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         response = xstrfmt("%s %s", user, hex);
 893         resp_len = strlen(response) + 1;
 894
 895         response_64 = xmalloc(ENCODED_SIZE(resp_len) + 1);
 896         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 897                                       (unsigned char *)response, resp_len);
 898         if (encoded_len < 0)
 899                 die("EVP_EncodeBlock error");
 900         response_64[encoded_len] = '\0';
 901         return (char *)response_64;
 902 }
 903
 904 #else
 905
 906 static char *cram(const char *challenge_64, const char *user, const char *pass)
 907 {
 908         die("If you want to use CRAM-MD5 authenticate method, "
 909             "you have to build git-imap-send with OpenSSL library.");
 910 }
 911
 912 #endif
 913
 914 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
 915 {
 916         int ret;
 917         char *response;
 918
 919         response = cram(prompt, server.user, server.pass);
 920
 921         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 922         if (ret != strlen(response))
 923                 return error("IMAP error: sending response failed");
 924
 925         free(response);
 926
 927         return 0;
 928 }
 929
 930 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
 931 {
 932         struct credential cred = CREDENTIAL_INIT;
 933         struct imap_store *ctx;
 934         struct imap *imap;
 935         char *arg, *rsp;
 936         int s = -1, preauth;
 937
 938         ctx = xcalloc(1, sizeof(*ctx));
 939
 940         ctx->imap = imap = xcalloc(1, sizeof(*imap));
 941         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 942         imap->in_progress_append = &imap->in_progress;
 943
 944         /* open connection to IMAP server */
 945
 946         if (srvc->tunnel) {
 947                 struct child_process tunnel = CHILD_PROCESS_INIT;
 948
 949                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 950
 951                 argv_array_push(&tunnel.args, srvc->tunnel);
 952                 tunnel.use_shell = 1;
 953                 tunnel.in = -1;
 954                 tunnel.out = -1;
 955                 if (start_command(&tunnel))
 956                         die("cannot start proxy %s", srvc->tunnel);
 957
 958                 imap->buf.sock.fd[0] = tunnel.out;
 959                 imap->buf.sock.fd[1] = tunnel.in;
 960
 961                 imap_info("ok\n");
 962         } else {
 963 #ifndef NO_IPV6
 964                 struct addrinfo hints, *ai0, *ai;
 965                 int gai;
 966                 char portstr[6];
 967
 968                 snprintf(portstr, sizeof(portstr), "%d", srvc->port);
 969
 970                 memset(&hints, 0, sizeof(hints));
 971                 hints.ai_socktype = SOCK_STREAM;
 972                 hints.ai_protocol = IPPROTO_TCP;
 973
 974                 imap_info("Resolving %s... ", srvc->host);
 975                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 976                 if (gai) {
 977                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 978                         goto bail;
 979                 }
 980                 imap_info("ok\n");
 981
 982                 for (ai0 = ai; ai; ai = ai->ai_next) {
 983                         char addr[NI_MAXHOST];
 984
 985                         s = socket(ai->ai_family, ai->ai_socktype,
 986                                    ai->ai_protocol);
 987                         if (s < 0)
 988                                 continue;
 989
 990                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
 991                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
 992                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
 993
 994                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 995                                 close(s);
 996                                 s = -1;
 997                                 perror("connect");
 998                                 continue;
 999                         }
1000
1001                         break;
1002                 }
1003                 freeaddrinfo(ai0);
1004 #else /* NO_IPV6 */
1005                 struct hostent *he;
1006                 struct sockaddr_in addr;
1007
1008                 memset(&addr, 0, sizeof(addr));
1009                 addr.sin_port = htons(srvc->port);
1010                 addr.sin_family = AF_INET;
1011
1012                 imap_info("Resolving %s... ", srvc->host);
1013                 he = gethostbyname(srvc->host);
1014                 if (!he) {
1015                         perror("gethostbyname");
1016                         goto bail;
1017                 }
1018                 imap_info("ok\n");
1019
1020                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1021
1022                 s = socket(PF_INET, SOCK_STREAM, 0);
1023
1024                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1025                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1026                         close(s);
1027                         s = -1;
1028                         perror("connect");
1029                 }
1030 #endif
1031                 if (s < 0) {
1032                         fputs("Error: unable to connect to server.\n", stderr);
1033                         goto bail;
1034                 }
1035
1036                 imap->buf.sock.fd[0] = s;
1037                 imap->buf.sock.fd[1] = dup(s);
1038
1039                 if (srvc->use_ssl &&
1040                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1041                         close(s);
1042                         goto bail;
1043                 }
1044                 imap_info("ok\n");
1045         }
1046
1047         /* read the greeting string */
1048         if (buffer_gets(&imap->buf, &rsp)) {
1049                 fprintf(stderr, "IMAP error: no greeting response\n");
1050                 goto bail;
1051         }
1052         arg = next_arg(&rsp);
1053         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1054                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1055                 goto bail;
1056         }
1057         preauth = 0;
1058         if (!strcmp("PREAUTH", arg))
1059                 preauth = 1;
1060         else if (strcmp("OK", arg) != 0) {
1061                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1062                 goto bail;
1063         }
1064         parse_response_code(ctx, NULL, rsp);
1065         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1066                 goto bail;
1067
1068         if (!preauth) {
1069 #ifndef NO_OPENSSL
1070                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1071                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1072                                 goto bail;
1073                         if (ssl_socket_connect(&imap->buf.sock, 1,
1074                                                srvc->ssl_verify))
1075                                 goto bail;
1076                         /* capabilities may have changed, so get the new capabilities */
1077                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1078                                 goto bail;
1079                 }
1080 #endif
1081                 imap_info("Logging in...\n");
1082                 if (!srvc->user || !srvc->pass) {
1083                         cred.protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
1084                         cred.host = xstrdup(srvc->host);
1085
1086                         if (srvc->user)
1087                                 cred.username = xstrdup(srvc->user);
1088                         if (srvc->pass)
1089                                 cred.password = xstrdup(srvc->pass);
1090
1091                         credential_fill(&cred);
1092
1093                         if (!srvc->user)
1094                                 srvc->user = xstrdup(cred.username);
1095                         if (!srvc->pass)
1096                                 srvc->pass = xstrdup(cred.password);
1097                 }
1098
1099                 if (CAP(NOLOGIN)) {
1100                         fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host);
1101                         goto bail;
1102                 }
1103
1104                 if (srvc->auth_method) {
1105                         struct imap_cmd_cb cb;
1106
1107                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1108                                 if (!CAP(AUTH_CRAM_MD5)) {
1109                                         fprintf(stderr, "You specified"
1110                                                 "CRAM-MD5 as authentication method, "
1111                                                 "but %s doesn't support it.\n", srvc->host);
1112                                         goto bail;
1113                                 }
1114                                 /* CRAM-MD5 */
1115
1116                                 memset(&cb, 0, sizeof(cb));
1117                                 cb.cont = auth_cram_md5;
1118                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1119                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1120                                         goto bail;
1121                                 }
1122                         } else {
1123                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1124                                 goto bail;
1125                         }
1126                 } else {
1127                         if (!imap->buf.sock.ssl)
1128                                 imap_warn("*** IMAP Warning *** Password is being "
1129                                           "sent in the clear\n");
1130                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1131                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1132                                 goto bail;
1133                         }
1134                 }
1135         } /* !preauth */
1136
1137         if (cred.username)
1138                 credential_approve(&cred);
1139         credential_clear(&cred);
1140
1141         /* check the target mailbox exists */
1142         ctx->name = folder;
1143         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1144         case RESP_OK:
1145                 /* ok */
1146                 break;
1147         case RESP_BAD:
1148                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1149                 goto out;
1150         case RESP_NO:
1151                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1152                         imap_info("Created missing mailbox\n");
1153                 } else {
1154                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1155                         goto out;
1156                 }
1157                 break;
1158         }
1159
1160         ctx->prefix = "";
1161         return ctx;
1162
1163 bail:
1164         if (cred.username)
1165                 credential_reject(&cred);
1166         credential_clear(&cred);
1167
1168  out:
1169         imap_close_store(ctx);
1170         return NULL;
1171 }
1172
1173 /*
1174  * Insert CR characters as necessary in *msg to ensure that every LF
1175  * character in *msg is preceded by a CR.
1176  */
1177 static void lf_to_crlf(struct strbuf *msg)
1178 {
1179         char *new;
1180         size_t i, j;
1181         char lastc;
1182
1183         /* First pass: tally, in j, the size of the new string: */
1184         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1185                 if (msg->buf[i] == '\n' && lastc != '\r')
1186                         j++; /* a CR will need to be added here */
1187                 lastc = msg->buf[i];
1188                 j++;
1189         }
1190
1191         new = xmalloc(j + 1);
1192
1193         /*
1194          * Second pass: write the new string.  Note that this loop is
1195          * otherwise identical to the first pass.
1196          */
1197         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1198                 if (msg->buf[i] == '\n' && lastc != '\r')
1199                         new[j++] = '\r';
1200                 lastc = new[j++] = msg->buf[i];
1201         }
1202         strbuf_attach(msg, new, j, j + 1);
1203 }
1204
1205 /*
1206  * Store msg to IMAP.  Also detach and free the data from msg->data,
1207  * leaving msg->data empty.
1208  */
1209 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1210 {
1211         struct imap *imap = ctx->imap;
1212         struct imap_cmd_cb cb;
1213         const char *prefix, *box;
1214         int ret;
1215
1216         lf_to_crlf(msg);
1217         memset(&cb, 0, sizeof(cb));
1218
1219         cb.dlen = msg->len;
1220         cb.data = strbuf_detach(msg, NULL);
1221
1222         box = ctx->name;
1223         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1224         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1225         imap->caps = imap->rcaps;
1226         if (ret != DRV_OK)
1227                 return ret;
1228
1229         return DRV_OK;
1230 }
1231
1232 static void wrap_in_html(struct strbuf *msg)
1233 {
1234         struct strbuf buf = STRBUF_INIT;
1235         static char *content_type = "Content-Type: text/html;\n";
1236         static char *pre_open = "<pre>\n";
1237         static char *pre_close = "</pre>\n";
1238         const char *body = strstr(msg->buf, "\n\n");
1239
1240         if (!body)
1241                 return; /* Headers but no body; no wrapping needed */
1242
1243         body += 2;
1244
1245         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1246         strbuf_addstr(&buf, content_type);
1247         strbuf_addch(&buf, '\n');
1248         strbuf_addstr(&buf, pre_open);
1249         strbuf_addstr_xml_quoted(&buf, body);
1250         strbuf_addstr(&buf, pre_close);
1251
1252         strbuf_release(msg);
1253         *msg = buf;
1254 }
1255
1256 #define CHUNKSIZE 0x1000
1257
1258 static int read_message(FILE *f, struct strbuf *all_msgs)
1259 {
1260         do {
1261                 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1262                         break;
1263         } while (!feof(f));
1264
1265         return ferror(f) ? -1 : 0;
1266 }
1267
1268 static int count_messages(struct strbuf *all_msgs)
1269 {
1270         int count = 0;
1271         char *p = all_msgs->buf;
1272
1273         while (1) {
1274                 if (starts_with(p, "From ")) {
1275                         p = strstr(p+5, "\nFrom: ");
1276                         if (!p) break;
1277                         p = strstr(p+7, "\nDate: ");
1278                         if (!p) break;
1279                         p = strstr(p+7, "\nSubject: ");
1280                         if (!p) break;
1281                         p += 10;
1282                         count++;
1283                 }
1284                 p = strstr(p+5, "\nFrom ");
1285                 if (!p)
1286                         break;
1287                 p++;
1288         }
1289         return count;
1290 }
1291
1292 /*
1293  * Copy the next message from all_msgs, starting at offset *ofs, to
1294  * msg.  Update *ofs to the start of the following message.  Return
1295  * true iff a message was successfully copied.
1296  */
1297 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1298 {
1299         char *p, *data;
1300         size_t len;
1301
1302         if (*ofs >= all_msgs->len)
1303                 return 0;
1304
1305         data = &all_msgs->buf[*ofs];
1306         len = all_msgs->len - *ofs;
1307
1308         if (len < 5 || !starts_with(data, "From "))
1309                 return 0;
1310
1311         p = strchr(data, '\n');
1312         if (p) {
1313                 p++;
1314                 len -= p - data;
1315                 *ofs += p - data;
1316                 data = p;
1317         }
1318
1319         p = strstr(data, "\nFrom ");
1320         if (p)
1321                 len = &p[1] - data;
1322
1323         strbuf_add(msg, data, len);
1324         *ofs += len;
1325         return 1;
1326 }
1327
1328 static void git_imap_config(void)
1329 {
1330         const char *val = NULL;
1331
1332         git_config_get_bool("imap.sslverify", &server.ssl_verify);
1333         git_config_get_bool("imap.preformattedhtml", &server.use_html);
1334         git_config_get_string("imap.folder", &server.folder);
1335
1336         if (!git_config_get_value("imap.host", &val)) {
1337                 if (!val) {
1338                         git_die_config("imap.host", "Missing value for 'imap.host'");
1339                 } else {
1340                         if (starts_with(val, "imap:"))
1341                                 val += 5;
1342                         else if (starts_with(val, "imaps:")) {
1343                                 val += 6;
1344                                 server.use_ssl = 1;
1345                         }
1346                         if (starts_with(val, "//"))
1347                                 val += 2;
1348                         server.host = xstrdup(val);
1349                 }
1350         }
1351
1352         git_config_get_string("imap.user", &server.user);
1353         git_config_get_string("imap.pass", &server.pass);
1354         git_config_get_int("imap.port", &server.port);
1355         git_config_get_string("imap.tunnel", &server.tunnel);
1356         git_config_get_string("imap.authmethod", &server.auth_method);
1357 }
1358
1359 static int append_msgs_to_imap(struct imap_server_conf *server,
1360                                struct strbuf* all_msgs, int total)
1361 {
1362         struct strbuf msg = STRBUF_INIT;
1363         struct imap_store *ctx = NULL;
1364         int ofs = 0;
1365         int r;
1366         int n = 0;
1367
1368         ctx = imap_open_store(server, server->folder);
1369         if (!ctx) {
1370                 fprintf(stderr, "failed to open store\n");
1371                 return 1;
1372         }
1373         ctx->name = server->folder;
1374
1375         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1376         while (1) {
1377                 unsigned percent = n * 100 / total;
1378
1379                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1380
1381                 if (!split_msg(all_msgs, &msg, &ofs))
1382                         break;
1383                 if (server->use_html)
1384                         wrap_in_html(&msg);
1385                 r = imap_store_msg(ctx, &msg);
1386                 if (r != DRV_OK)
1387                         break;
1388                 n++;
1389         }
1390         fprintf(stderr, "\n");
1391
1392         imap_close_store(ctx);
1393
1394         return 0;
1395 }
1396
1397 #ifdef USE_CURL_FOR_IMAP_SEND
1398 static CURL *setup_curl(struct imap_server_conf *srvc)
1399 {
1400         CURL *curl;
1401         struct strbuf path = STRBUF_INIT;
1402
1403         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1404                 die("curl_global_init failed");
1405
1406         curl = curl_easy_init();
1407
1408         if (!curl)
1409                 die("curl_easy_init failed");
1410
1411         curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
1412         curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
1413
1414         strbuf_addstr(&path, server.host);
1415         if (!path.len || path.buf[path.len - 1] != '/')
1416                 strbuf_addch(&path, '/');
1417         strbuf_addstr(&path, server.folder);
1418
1419         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1420         strbuf_release(&path);
1421         curl_easy_setopt(curl, CURLOPT_PORT, server.port);
1422
1423         if (server.auth_method) {
1424 #if LIBCURL_VERSION_NUM < 0x072200
1425                 warning("No LOGIN_OPTIONS support in this cURL version");
1426 #else
1427                 struct strbuf auth = STRBUF_INIT;
1428                 strbuf_addstr(&auth, "AUTH=");
1429                 strbuf_addstr(&auth, server.auth_method);
1430                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1431                 strbuf_release(&auth);
1432 #endif
1433         }
1434
1435         if (!server.use_ssl)
1436                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1437
1438         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
1439         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
1440
1441         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1442
1443         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1444
1445         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1446                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
1447
1448         return curl;
1449 }
1450
1451 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1452                                     struct strbuf* all_msgs, int total) {
1453         int ofs = 0;
1454         int n = 0;
1455         struct buffer msgbuf = { STRBUF_INIT, 0 };
1456         CURL *curl;
1457         CURLcode res = CURLE_OK;
1458
1459         curl = setup_curl(server);
1460         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1461
1462         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1463         while (1) {
1464                 unsigned percent = n * 100 / total;
1465                 int prev_len;
1466
1467                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1468
1469                 prev_len = msgbuf.buf.len;
1470                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1471                         break;
1472                 if (server->use_html)
1473                         wrap_in_html(&msgbuf.buf);
1474                 lf_to_crlf(&msgbuf.buf);
1475
1476                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1477                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1478
1479                 res = curl_easy_perform(curl);
1480
1481                 if(res != CURLE_OK) {
1482                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1483                                         curl_easy_strerror(res));
1484                         break;
1485                 }
1486
1487                 n++;
1488         }
1489         fprintf(stderr, "\n");
1490
1491         curl_easy_cleanup(curl);
1492         curl_global_cleanup();
1493
1494         return 0;
1495 }
1496 #endif
1497
1498 int main(int argc, char **argv)
1499 {
1500         struct strbuf all_msgs = STRBUF_INIT;
1501         int total;
1502         int nongit_ok;
1503
1504         git_extract_argv0_path(argv[0]);
1505
1506         git_setup_gettext();
1507
1508         setup_git_directory_gently(&nongit_ok);
1509         git_imap_config();
1510
1511         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1512
1513         if (argc)
1514                 usage_with_options(imap_send_usage, imap_send_options);
1515
1516 #ifndef USE_CURL_FOR_IMAP_SEND
1517         if (use_curl) {
1518                 warning("--curl not supported in this build");
1519                 use_curl = 0;
1520         }
1521 #elif defined(NO_OPENSSL)
1522         if (!use_curl) {
1523                 warning("--no-curl not supported in this build");
1524                 use_curl = 1;
1525         }
1526 #endif
1527
1528         if (!server.port)
1529                 server.port = server.use_ssl ? 993 : 143;
1530
1531         if (!server.folder) {
1532                 fprintf(stderr, "no imap store specified\n");
1533                 return 1;
1534         }
1535         if (!server.host) {
1536                 if (!server.tunnel) {
1537                         fprintf(stderr, "no imap host specified\n");
1538                         return 1;
1539                 }
1540                 server.host = "tunnel";
1541         }
1542
1543         /* read the messages */
1544         if (read_message(stdin, &all_msgs)) {
1545                 fprintf(stderr, "error reading input\n");
1546                 return 1;
1547         }
1548
1549         if (all_msgs.len == 0) {
1550                 fprintf(stderr, "nothing to send\n");
1551                 return 1;
1552         }
1553
1554         total = count_messages(&all_msgs);
1555         if (!total) {
1556                 fprintf(stderr, "no messages to send\n");
1557                 return 1;
1558         }
1559
1560         /* write it to the imap server */
1561
1562         if (server.tunnel)
1563                 return append_msgs_to_imap(&server, &all_msgs, total);
1564
1565 #ifdef USE_CURL_FOR_IMAP_SEND
1566         if (use_curl)
1567                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1568 #endif
1569
1570         return append_msgs_to_imap(&server, &all_msgs, total);
1571 }