imap-send.c

   1 /*
   2  * git-imap-send - drops patches into an imap Drafts folder
   3  *                 derived from isync/mbsync - mailbox synchronizer
   4  *
   5  * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
   6  * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
   7  * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
   8  * Copyright (C) 2006 Mike McCormack
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <http://www.gnu.org/licenses/>.
  22  */
  23
  24 #include "git-compat-util.h"
  25 #include "config.h"
  26 #include "credential.h"
  27 #include "exec-cmd.h"
  28 #include "gettext.h"
  29 #include "run-command.h"
  30 #include "parse-options.h"
  31 #include "setup.h"
  32 #include "strbuf.h"
  33 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
  34 typedef void *SSL;
  35 #endif
  36 #ifdef USE_CURL_FOR_IMAP_SEND
  37 #include "http.h"
  38 #endif
  39
  40 #if defined(USE_CURL_FOR_IMAP_SEND)
  41 /* Always default to curl if it's available. */
  42 #define USE_CURL_DEFAULT 1
  43 #else
  44 /* We don't have curl, so continue to use the historical implementation */
  45 #define USE_CURL_DEFAULT 0
  46 #endif
  47
  48 static int verbosity;
  49 static int use_curl = USE_CURL_DEFAULT;
  50
  51 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
  52
  53 static struct option imap_send_options[] = {
  54         OPT__VERBOSITY(&verbosity),
  55         OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
  56         OPT_END()
  57 };
  58
  59 #undef DRV_OK
  60 #define DRV_OK          0
  61 #define DRV_MSG_BAD     -1
  62 #define DRV_BOX_BAD     -2
  63 #define DRV_STORE_BAD   -3
  64
  65 __attribute__((format (printf, 1, 2)))
  66 static void imap_info(const char *, ...);
  67 __attribute__((format (printf, 1, 2)))
  68 static void imap_warn(const char *, ...);
  69
  70 static char *next_arg(char **);
  71
  72 __attribute__((format (printf, 3, 4)))
  73 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
  74
  75 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
  76 {
  77         int len;
  78         char tmp[8192];
  79
  80         len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
  81         if (len < 0)
  82                 die("Fatal: Out of memory");
  83         if (len >= sizeof(tmp))
  84                 die("imap command overflow!");
  85         *strp = xmemdupz(tmp, len);
  86         return len;
  87 }
  88
  89 struct imap_server_conf {
  90         const char *name;
  91         const char *tunnel;
  92         const char *host;
  93         int port;
  94         const char *folder;
  95         const char *user;
  96         const char *pass;
  97         int use_ssl;
  98         int ssl_verify;
  99         int use_html;
 100         const char *auth_method;
 101 };
 102
 103 static struct imap_server_conf server = {
 104         .ssl_verify = 1,
 105 };
 106
 107 struct imap_socket {
 108         int fd[2];
 109         SSL *ssl;
 110 };
 111
 112 struct imap_buffer {
 113         struct imap_socket sock;
 114         int bytes;
 115         int offset;
 116         char buf[1024];
 117 };
 118
 119 struct imap_cmd;
 120
 121 struct imap {
 122         int uidnext; /* from SELECT responses */
 123         unsigned caps, rcaps; /* CAPABILITY results */
 124         /* command queue */
 125         int nexttag, num_in_progress, literal_pending;
 126         struct imap_cmd *in_progress, **in_progress_append;
 127         struct imap_buffer buf; /* this is BIG, so put it last */
 128 };
 129
 130 struct imap_store {
 131         /* currently open mailbox */
 132         const char *name; /* foreign! maybe preset? */
 133         int uidvalidity;
 134         struct imap *imap;
 135         const char *prefix;
 136 };
 137
 138 struct imap_cmd_cb {
 139         int (*cont)(struct imap_store *ctx, const char *prompt);
 140         void *ctx;
 141         char *data;
 142         int dlen;
 143 };
 144
 145 struct imap_cmd {
 146         struct imap_cmd *next;
 147         struct imap_cmd_cb cb;
 148         char *cmd;
 149         int tag;
 150 };
 151
 152 #define CAP(cap) (imap->caps & (1 << (cap)))
 153
 154 enum CAPABILITY {
 155         NOLOGIN = 0,
 156         UIDPLUS,
 157         LITERALPLUS,
 158         NAMESPACE,
 159         STARTTLS,
 160         AUTH_CRAM_MD5
 161 };
 162
 163 static const char *cap_list[] = {
 164         "LOGINDISABLED",
 165         "UIDPLUS",
 166         "LITERAL+",
 167         "NAMESPACE",
 168         "STARTTLS",
 169         "AUTH=CRAM-MD5",
 170 };
 171
 172 #define RESP_OK    0
 173 #define RESP_NO    1
 174 #define RESP_BAD   2
 175
 176 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 177
 178
 179 #ifndef NO_OPENSSL
 180 static void ssl_socket_perror(const char *func)
 181 {
 182         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 183 }
 184 #endif
 185
 186 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 187 {
 188 #ifndef NO_OPENSSL
 189         if (sock->ssl) {
 190                 int sslerr = SSL_get_error(sock->ssl, ret);
 191                 switch (sslerr) {
 192                 case SSL_ERROR_NONE:
 193                         break;
 194                 case SSL_ERROR_SYSCALL:
 195                         perror("SSL_connect");
 196                         break;
 197                 default:
 198                         ssl_socket_perror("SSL_connect");
 199                         break;
 200                 }
 201         } else
 202 #endif
 203         {
 204                 if (ret < 0)
 205                         perror(func);
 206                 else
 207                         fprintf(stderr, "%s: unexpected EOF\n", func);
 208         }
 209 }
 210
 211 #ifdef NO_OPENSSL
 212 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 213 {
 214         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 215         return -1;
 216 }
 217
 218 #else
 219
 220 static int host_matches(const char *host, const char *pattern)
 221 {
 222         if (pattern[0] == '*' && pattern[1] == '.') {
 223                 pattern += 2;
 224                 if (!(host = strchr(host, '.')))
 225                         return 0;
 226                 host++;
 227         }
 228
 229         return *host && *pattern && !strcasecmp(host, pattern);
 230 }
 231
 232 static int verify_hostname(X509 *cert, const char *hostname)
 233 {
 234         int len;
 235         X509_NAME *subj;
 236         char cname[1000];
 237         int i, found;
 238         STACK_OF(GENERAL_NAME) *subj_alt_names;
 239
 240         /* try the DNS subjectAltNames */
 241         found = 0;
 242         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
 243                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
 244                 for (i = 0; !found && i < num_subj_alt_names; i++) {
 245                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 246                         if (subj_alt_name->type == GEN_DNS &&
 247                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
 248                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
 249                                 found = 1;
 250                 }
 251                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
 252         }
 253         if (found)
 254                 return 0;
 255
 256         /* try the common name */
 257         if (!(subj = X509_get_subject_name(cert)))
 258                 return error("cannot get certificate subject");
 259         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
 260                 return error("cannot get certificate common name");
 261         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
 262                 return 0;
 263         return error("certificate owner '%s' does not match hostname '%s'",
 264                      cname, hostname);
 265 }
 266
 267 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 268 {
 269 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 270         const SSL_METHOD *meth;
 271 #else
 272         SSL_METHOD *meth;
 273 #endif
 274         SSL_CTX *ctx;
 275         int ret;
 276         X509 *cert;
 277
 278         SSL_library_init();
 279         SSL_load_error_strings();
 280
 281         meth = SSLv23_method();
 282         if (!meth) {
 283                 ssl_socket_perror("SSLv23_method");
 284                 return -1;
 285         }
 286
 287         ctx = SSL_CTX_new(meth);
 288         if (!ctx) {
 289                 ssl_socket_perror("SSL_CTX_new");
 290                 return -1;
 291         }
 292
 293         if (use_tls_only)
 294                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 295
 296         if (verify)
 297                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 298
 299         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 300                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 301                 return -1;
 302         }
 303         sock->ssl = SSL_new(ctx);
 304         if (!sock->ssl) {
 305                 ssl_socket_perror("SSL_new");
 306                 return -1;
 307         }
 308         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 309                 ssl_socket_perror("SSL_set_rfd");
 310                 return -1;
 311         }
 312         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 313                 ssl_socket_perror("SSL_set_wfd");
 314                 return -1;
 315         }
 316
 317 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 318         /*
 319          * SNI (RFC4366)
 320          * OpenSSL does not document this function, but the implementation
 321          * returns 1 on success, 0 on failure after calling SSLerr().
 322          */
 323         ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
 324         if (ret != 1)
 325                 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
 326 #endif
 327
 328         ret = SSL_connect(sock->ssl);
 329         if (ret <= 0) {
 330                 socket_perror("SSL_connect", sock, ret);
 331                 return -1;
 332         }
 333
 334         if (verify) {
 335                 /* make sure the hostname matches that of the certificate */
 336                 cert = SSL_get_peer_certificate(sock->ssl);
 337                 if (!cert)
 338                         return error("unable to get peer certificate.");
 339                 if (verify_hostname(cert, server.host) < 0)
 340                         return -1;
 341         }
 342
 343         return 0;
 344 }
 345 #endif
 346
 347 static int socket_read(struct imap_socket *sock, char *buf, int len)
 348 {
 349         ssize_t n;
 350 #ifndef NO_OPENSSL
 351         if (sock->ssl)
 352                 n = SSL_read(sock->ssl, buf, len);
 353         else
 354 #endif
 355                 n = xread(sock->fd[0], buf, len);
 356         if (n <= 0) {
 357                 socket_perror("read", sock, n);
 358                 close(sock->fd[0]);
 359                 close(sock->fd[1]);
 360                 sock->fd[0] = sock->fd[1] = -1;
 361         }
 362         return n;
 363 }
 364
 365 static int socket_write(struct imap_socket *sock, const char *buf, int len)
 366 {
 367         int n;
 368 #ifndef NO_OPENSSL
 369         if (sock->ssl)
 370                 n = SSL_write(sock->ssl, buf, len);
 371         else
 372 #endif
 373                 n = write_in_full(sock->fd[1], buf, len);
 374         if (n != len) {
 375                 socket_perror("write", sock, n);
 376                 close(sock->fd[0]);
 377                 close(sock->fd[1]);
 378                 sock->fd[0] = sock->fd[1] = -1;
 379         }
 380         return n;
 381 }
 382
 383 static void socket_shutdown(struct imap_socket *sock)
 384 {
 385 #ifndef NO_OPENSSL
 386         if (sock->ssl) {
 387                 SSL_shutdown(sock->ssl);
 388                 SSL_free(sock->ssl);
 389         }
 390 #endif
 391         close(sock->fd[0]);
 392         close(sock->fd[1]);
 393 }
 394
 395 /* simple line buffering */
 396 static int buffer_gets(struct imap_buffer *b, char **s)
 397 {
 398         int n;
 399         int start = b->offset;
 400
 401         *s = b->buf + start;
 402
 403         for (;;) {
 404                 /* make sure we have enough data to read the \r\n sequence */
 405                 if (b->offset + 1 >= b->bytes) {
 406                         if (start) {
 407                                 /* shift down used bytes */
 408                                 *s = b->buf;
 409
 410                                 assert(start <= b->bytes);
 411                                 n = b->bytes - start;
 412
 413                                 if (n)
 414                                         memmove(b->buf, b->buf + start, n);
 415                                 b->offset -= start;
 416                                 b->bytes = n;
 417                                 start = 0;
 418                         }
 419
 420                         n = socket_read(&b->sock, b->buf + b->bytes,
 421                                          sizeof(b->buf) - b->bytes);
 422
 423                         if (n <= 0)
 424                                 return -1;
 425
 426                         b->bytes += n;
 427                 }
 428
 429                 if (b->buf[b->offset] == '\r') {
 430                         assert(b->offset + 1 < b->bytes);
 431                         if (b->buf[b->offset + 1] == '\n') {
 432                                 b->buf[b->offset] = 0;  /* terminate the string */
 433                                 b->offset += 2; /* next line */
 434                                 if (0 < verbosity)
 435                                         puts(*s);
 436                                 return 0;
 437                         }
 438                 }
 439
 440                 b->offset++;
 441         }
 442         /* not reached */
 443 }
 444
 445 __attribute__((format (printf, 1, 2)))
 446 static void imap_info(const char *msg, ...)
 447 {
 448         va_list va;
 449
 450         if (0 <= verbosity) {
 451                 va_start(va, msg);
 452                 vprintf(msg, va);
 453                 va_end(va);
 454                 fflush(stdout);
 455         }
 456 }
 457
 458 __attribute__((format (printf, 1, 2)))
 459 static void imap_warn(const char *msg, ...)
 460 {
 461         va_list va;
 462
 463         if (-2 < verbosity) {
 464                 va_start(va, msg);
 465                 vfprintf(stderr, msg, va);
 466                 va_end(va);
 467         }
 468 }
 469
 470 static char *next_arg(char **s)
 471 {
 472         char *ret;
 473
 474         if (!s || !*s)
 475                 return NULL;
 476         while (isspace((unsigned char) **s))
 477                 (*s)++;
 478         if (!**s) {
 479                 *s = NULL;
 480                 return NULL;
 481         }
 482         if (**s == '"') {
 483                 ++*s;
 484                 ret = *s;
 485                 *s = strchr(*s, '"');
 486         } else {
 487                 ret = *s;
 488                 while (**s && !isspace((unsigned char) **s))
 489                         (*s)++;
 490         }
 491         if (*s) {
 492                 if (**s)
 493                         *(*s)++ = 0;
 494                 if (!**s)
 495                         *s = NULL;
 496         }
 497         return ret;
 498 }
 499
 500 __attribute__((format (printf, 3, 4)))
 501 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
 502 {
 503         int ret;
 504         va_list va;
 505
 506         va_start(va, fmt);
 507         if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
 508                 BUG("buffer too small. Please report a bug.");
 509         va_end(va);
 510         return ret;
 511 }
 512
 513 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 514                                        struct imap_cmd_cb *cb,
 515                                        const char *fmt, va_list ap)
 516 {
 517         struct imap *imap = ctx->imap;
 518         struct imap_cmd *cmd;
 519         int n, bufl;
 520         char buf[1024];
 521
 522         cmd = xmalloc(sizeof(struct imap_cmd));
 523         nfvasprintf(&cmd->cmd, fmt, ap);
 524         cmd->tag = ++imap->nexttag;
 525
 526         if (cb)
 527                 cmd->cb = *cb;
 528         else
 529                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 530
 531         while (imap->literal_pending)
 532                 get_cmd_result(ctx, NULL);
 533
 534         if (!cmd->cb.data)
 535                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
 536         else
 537                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
 538                                   cmd->tag, cmd->cmd, cmd->cb.dlen,
 539                                   CAP(LITERALPLUS) ? "+" : "");
 540
 541         if (0 < verbosity) {
 542                 if (imap->num_in_progress)
 543                         printf("(%d in progress) ", imap->num_in_progress);
 544                 if (!starts_with(cmd->cmd, "LOGIN"))
 545                         printf(">>> %s", buf);
 546                 else
 547                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 548         }
 549         if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
 550                 free(cmd->cmd);
 551                 free(cmd);
 552                 if (cb)
 553                         free(cb->data);
 554                 return NULL;
 555         }
 556         if (cmd->cb.data) {
 557                 if (CAP(LITERALPLUS)) {
 558                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 559                         free(cmd->cb.data);
 560                         if (n != cmd->cb.dlen ||
 561                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 562                                 free(cmd->cmd);
 563                                 free(cmd);
 564                                 return NULL;
 565                         }
 566                         cmd->cb.data = NULL;
 567                 } else
 568                         imap->literal_pending = 1;
 569         } else if (cmd->cb.cont)
 570                 imap->literal_pending = 1;
 571         cmd->next = NULL;
 572         *imap->in_progress_append = cmd;
 573         imap->in_progress_append = &cmd->next;
 574         imap->num_in_progress++;
 575         return cmd;
 576 }
 577
 578 __attribute__((format (printf, 3, 4)))
 579 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 580                      const char *fmt, ...)
 581 {
 582         va_list ap;
 583         struct imap_cmd *cmdp;
 584
 585         va_start(ap, fmt);
 586         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 587         va_end(ap);
 588         if (!cmdp)
 589                 return RESP_BAD;
 590
 591         return get_cmd_result(ctx, cmdp);
 592 }
 593
 594 __attribute__((format (printf, 3, 4)))
 595 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 596                        const char *fmt, ...)
 597 {
 598         va_list ap;
 599         struct imap_cmd *cmdp;
 600
 601         va_start(ap, fmt);
 602         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 603         va_end(ap);
 604         if (!cmdp)
 605                 return DRV_STORE_BAD;
 606
 607         switch (get_cmd_result(ctx, cmdp)) {
 608         case RESP_BAD: return DRV_STORE_BAD;
 609         case RESP_NO: return DRV_MSG_BAD;
 610         default: return DRV_OK;
 611         }
 612 }
 613
 614 static int skip_imap_list_l(char **sp, int level)
 615 {
 616         char *s = *sp;
 617
 618         for (;;) {
 619                 while (isspace((unsigned char)*s))
 620                         s++;
 621                 if (level && *s == ')') {
 622                         s++;
 623                         break;
 624                 }
 625                 if (*s == '(') {
 626                         /* sublist */
 627                         s++;
 628                         if (skip_imap_list_l(&s, level + 1))
 629                                 goto bail;
 630                 } else if (*s == '"') {
 631                         /* quoted string */
 632                         s++;
 633                         for (; *s != '"'; s++)
 634                                 if (!*s)
 635                                         goto bail;
 636                         s++;
 637                 } else {
 638                         /* atom */
 639                         for (; *s && !isspace((unsigned char)*s); s++)
 640                                 if (level && *s == ')')
 641                                         break;
 642                 }
 643
 644                 if (!level)
 645                         break;
 646                 if (!*s)
 647                         goto bail;
 648         }
 649         *sp = s;
 650         return 0;
 651
 652 bail:
 653         return -1;
 654 }
 655
 656 static void skip_list(char **sp)
 657 {
 658         skip_imap_list_l(sp, 0);
 659 }
 660
 661 static void parse_capability(struct imap *imap, char *cmd)
 662 {
 663         char *arg;
 664         unsigned i;
 665
 666         imap->caps = 0x80000000;
 667         while ((arg = next_arg(&cmd)))
 668                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 669                         if (!strcmp(cap_list[i], arg))
 670                                 imap->caps |= 1 << i;
 671         imap->rcaps = imap->caps;
 672 }
 673
 674 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 675                                char *s)
 676 {
 677         struct imap *imap = ctx->imap;
 678         char *arg, *p;
 679
 680         if (!s || *s != '[')
 681                 return RESP_OK;         /* no response code */
 682         s++;
 683         if (!(p = strchr(s, ']'))) {
 684                 fprintf(stderr, "IMAP error: malformed response code\n");
 685                 return RESP_BAD;
 686         }
 687         *p++ = 0;
 688         arg = next_arg(&s);
 689         if (!arg) {
 690                 fprintf(stderr, "IMAP error: empty response code\n");
 691                 return RESP_BAD;
 692         }
 693         if (!strcmp("UIDVALIDITY", arg)) {
 694                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 695                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 696                         return RESP_BAD;
 697                 }
 698         } else if (!strcmp("UIDNEXT", arg)) {
 699                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 700                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 701                         return RESP_BAD;
 702                 }
 703         } else if (!strcmp("CAPABILITY", arg)) {
 704                 parse_capability(imap, s);
 705         } else if (!strcmp("ALERT", arg)) {
 706                 /* RFC2060 says that these messages MUST be displayed
 707                  * to the user
 708                  */
 709                 for (; isspace((unsigned char)*p); p++);
 710                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 711         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 712                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 713                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 714                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 715                         return RESP_BAD;
 716                 }
 717         }
 718         return RESP_OK;
 719 }
 720
 721 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 722 {
 723         struct imap *imap = ctx->imap;
 724         struct imap_cmd *cmdp, **pcmdp;
 725         char *cmd;
 726         const char *arg, *arg1;
 727         int n, resp, resp2, tag;
 728
 729         for (;;) {
 730                 if (buffer_gets(&imap->buf, &cmd))
 731                         return RESP_BAD;
 732
 733                 arg = next_arg(&cmd);
 734                 if (!arg) {
 735                         fprintf(stderr, "IMAP error: empty response\n");
 736                         return RESP_BAD;
 737                 }
 738                 if (*arg == '*') {
 739                         arg = next_arg(&cmd);
 740                         if (!arg) {
 741                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 742                                 return RESP_BAD;
 743                         }
 744
 745                         if (!strcmp("NAMESPACE", arg)) {
 746                                 /* rfc2342 NAMESPACE response. */
 747                                 skip_list(&cmd); /* Personal mailboxes */
 748                                 skip_list(&cmd); /* Others' mailboxes */
 749                                 skip_list(&cmd); /* Shared mailboxes */
 750                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 751                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 752                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 753                                         return resp;
 754                         } else if (!strcmp("CAPABILITY", arg)) {
 755                                 parse_capability(imap, cmd);
 756                         } else if ((arg1 = next_arg(&cmd))) {
 757                                 ; /*
 758                                    * Unhandled response-data with at least two words.
 759                                    * Ignore it.
 760                                    *
 761                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 762                                    * and '<num> RECENT' but as a probably-unintended side
 763                                    * effect it ignores other unrecognized two-word
 764                                    * responses.  imap-send doesn't ever try to read
 765                                    * messages or mailboxes these days, so consider
 766                                    * eliminating this case.
 767                                    */
 768                         } else {
 769                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 770                                 return RESP_BAD;
 771                         }
 772                 } else if (!imap->in_progress) {
 773                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 774                         return RESP_BAD;
 775                 } else if (*arg == '+') {
 776                         /* This can happen only with the last command underway, as
 777                            it enforces a round-trip. */
 778                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 779                                offsetof(struct imap_cmd, next));
 780                         if (cmdp->cb.data) {
 781                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 782                                 FREE_AND_NULL(cmdp->cb.data);
 783                                 if (n != (int)cmdp->cb.dlen)
 784                                         return RESP_BAD;
 785                         } else if (cmdp->cb.cont) {
 786                                 if (cmdp->cb.cont(ctx, cmd))
 787                                         return RESP_BAD;
 788                         } else {
 789                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 790                                 return RESP_BAD;
 791                         }
 792                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 793                                 return RESP_BAD;
 794                         if (!cmdp->cb.cont)
 795                                 imap->literal_pending = 0;
 796                         if (!tcmd)
 797                                 return DRV_OK;
 798                 } else {
 799                         tag = atoi(arg);
 800                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 801                                 if (cmdp->tag == tag)
 802                                         goto gottag;
 803                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 804                         return RESP_BAD;
 805                 gottag:
 806                         if (!(*pcmdp = cmdp->next))
 807                                 imap->in_progress_append = pcmdp;
 808                         imap->num_in_progress--;
 809                         if (cmdp->cb.cont || cmdp->cb.data)
 810                                 imap->literal_pending = 0;
 811                         arg = next_arg(&cmd);
 812                         if (!arg)
 813                                 arg = "";
 814                         if (!strcmp("OK", arg))
 815                                 resp = DRV_OK;
 816                         else {
 817                                 if (!strcmp("NO", arg))
 818                                         resp = RESP_NO;
 819                                 else /*if (!strcmp("BAD", arg))*/
 820                                         resp = RESP_BAD;
 821                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 822                                         !starts_with(cmdp->cmd, "LOGIN") ?
 823                                                         cmdp->cmd : "LOGIN <user> <pass>",
 824                                                         arg, cmd ? cmd : "");
 825                         }
 826                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 827                                 resp = resp2;
 828                         free(cmdp->cb.data);
 829                         free(cmdp->cmd);
 830                         free(cmdp);
 831                         if (!tcmd || tcmd == cmdp)
 832                                 return resp;
 833                 }
 834         }
 835         /* not reached */
 836 }
 837
 838 static void imap_close_server(struct imap_store *ictx)
 839 {
 840         struct imap *imap = ictx->imap;
 841
 842         if (imap->buf.sock.fd[0] != -1) {
 843                 imap_exec(ictx, NULL, "LOGOUT");
 844                 socket_shutdown(&imap->buf.sock);
 845         }
 846         free(imap);
 847 }
 848
 849 static void imap_close_store(struct imap_store *ctx)
 850 {
 851         imap_close_server(ctx);
 852         free(ctx);
 853 }
 854
 855 #ifndef NO_OPENSSL
 856
 857 /*
 858  * hexchar() and cram() functions are based on the code from the isync
 859  * project (http://isync.sf.net/).
 860  */
 861 static char hexchar(unsigned int b)
 862 {
 863         return b < 10 ? '0' + b : 'a' + (b - 10);
 864 }
 865
 866 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 867 static char *cram(const char *challenge_64, const char *user, const char *pass)
 868 {
 869         int i, resp_len, encoded_len, decoded_len;
 870         unsigned char hash[16];
 871         char hex[33];
 872         char *response, *response_64, *challenge;
 873
 874         /*
 875          * length of challenge_64 (i.e. base-64 encoded string) is a good
 876          * enough upper bound for challenge (decoded result).
 877          */
 878         encoded_len = strlen(challenge_64);
 879         challenge = xmalloc(encoded_len);
 880         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 881                                       (unsigned char *)challenge_64, encoded_len);
 882         if (decoded_len < 0)
 883                 die("invalid challenge %s", challenge_64);
 884         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 885                 die("HMAC error");
 886
 887         hex[32] = 0;
 888         for (i = 0; i < 16; i++) {
 889                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 890                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 891         }
 892
 893         /* response: "<user> <digest in hex>" */
 894         response = xstrfmt("%s %s", user, hex);
 895         resp_len = strlen(response);
 896
 897         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 898         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 899                                       (unsigned char *)response, resp_len);
 900         if (encoded_len < 0)
 901                 die("EVP_EncodeBlock error");
 902         return (char *)response_64;
 903 }
 904
 905 #else
 906
 907 static char *cram(const char *challenge_64, const char *user, const char *pass)
 908 {
 909         die("If you want to use CRAM-MD5 authenticate method, "
 910             "you have to build git-imap-send with OpenSSL library.");
 911 }
 912
 913 #endif
 914
 915 static int auth_cram_md5(struct imap_store *ctx, const char *prompt)
 916 {
 917         int ret;
 918         char *response;
 919
 920         response = cram(prompt, server.user, server.pass);
 921
 922         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 923         if (ret != strlen(response))
 924                 return error("IMAP error: sending response failed");
 925
 926         free(response);
 927
 928         return 0;
 929 }
 930
 931 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 932 {
 933         if (srvc->user && srvc->pass)
 934                 return;
 935
 936         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 937         cred->host = xstrdup(srvc->host);
 938
 939         cred->username = xstrdup_or_null(srvc->user);
 940         cred->password = xstrdup_or_null(srvc->pass);
 941
 942         credential_fill(cred);
 943
 944         if (!srvc->user)
 945                 srvc->user = xstrdup(cred->username);
 946         if (!srvc->pass)
 947                 srvc->pass = xstrdup(cred->password);
 948 }
 949
 950 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
 951 {
 952         struct credential cred = CREDENTIAL_INIT;
 953         struct imap_store *ctx;
 954         struct imap *imap;
 955         char *arg, *rsp;
 956         int s = -1, preauth;
 957
 958         CALLOC_ARRAY(ctx, 1);
 959
 960         ctx->imap = CALLOC_ARRAY(imap, 1);
 961         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 962         imap->in_progress_append = &imap->in_progress;
 963
 964         /* open connection to IMAP server */
 965
 966         if (srvc->tunnel) {
 967                 struct child_process tunnel = CHILD_PROCESS_INIT;
 968
 969                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 970
 971                 strvec_push(&tunnel.args, srvc->tunnel);
 972                 tunnel.use_shell = 1;
 973                 tunnel.in = -1;
 974                 tunnel.out = -1;
 975                 if (start_command(&tunnel))
 976                         die("cannot start proxy %s", srvc->tunnel);
 977
 978                 imap->buf.sock.fd[0] = tunnel.out;
 979                 imap->buf.sock.fd[1] = tunnel.in;
 980
 981                 imap_info("ok\n");
 982         } else {
 983 #ifndef NO_IPV6
 984                 struct addrinfo hints, *ai0, *ai;
 985                 int gai;
 986                 char portstr[6];
 987
 988                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 989
 990                 memset(&hints, 0, sizeof(hints));
 991                 hints.ai_socktype = SOCK_STREAM;
 992                 hints.ai_protocol = IPPROTO_TCP;
 993
 994                 imap_info("Resolving %s... ", srvc->host);
 995                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 996                 if (gai) {
 997                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 998                         goto bail;
 999                 }
1000                 imap_info("ok\n");
1001
1002                 for (ai0 = ai; ai; ai = ai->ai_next) {
1003                         char addr[NI_MAXHOST];
1004
1005                         s = socket(ai->ai_family, ai->ai_socktype,
1006                                    ai->ai_protocol);
1007                         if (s < 0)
1008                                 continue;
1009
1010                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1011                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
1012                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
1013
1014                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1015                                 close(s);
1016                                 s = -1;
1017                                 perror("connect");
1018                                 continue;
1019                         }
1020
1021                         break;
1022                 }
1023                 freeaddrinfo(ai0);
1024 #else /* NO_IPV6 */
1025                 struct hostent *he;
1026                 struct sockaddr_in addr;
1027
1028                 memset(&addr, 0, sizeof(addr));
1029                 addr.sin_port = htons(srvc->port);
1030                 addr.sin_family = AF_INET;
1031
1032                 imap_info("Resolving %s... ", srvc->host);
1033                 he = gethostbyname(srvc->host);
1034                 if (!he) {
1035                         perror("gethostbyname");
1036                         goto bail;
1037                 }
1038                 imap_info("ok\n");
1039
1040                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1041
1042                 s = socket(PF_INET, SOCK_STREAM, 0);
1043
1044                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1045                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1046                         close(s);
1047                         s = -1;
1048                         perror("connect");
1049                 }
1050 #endif
1051                 if (s < 0) {
1052                         fputs("Error: unable to connect to server.\n", stderr);
1053                         goto bail;
1054                 }
1055
1056                 imap->buf.sock.fd[0] = s;
1057                 imap->buf.sock.fd[1] = dup(s);
1058
1059                 if (srvc->use_ssl &&
1060                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1061                         close(s);
1062                         goto bail;
1063                 }
1064                 imap_info("ok\n");
1065         }
1066
1067         /* read the greeting string */
1068         if (buffer_gets(&imap->buf, &rsp)) {
1069                 fprintf(stderr, "IMAP error: no greeting response\n");
1070                 goto bail;
1071         }
1072         arg = next_arg(&rsp);
1073         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1074                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1075                 goto bail;
1076         }
1077         preauth = 0;
1078         if (!strcmp("PREAUTH", arg))
1079                 preauth = 1;
1080         else if (strcmp("OK", arg) != 0) {
1081                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1082                 goto bail;
1083         }
1084         parse_response_code(ctx, NULL, rsp);
1085         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1086                 goto bail;
1087
1088         if (!preauth) {
1089 #ifndef NO_OPENSSL
1090                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1091                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1092                                 goto bail;
1093                         if (ssl_socket_connect(&imap->buf.sock, 1,
1094                                                srvc->ssl_verify))
1095                                 goto bail;
1096                         /* capabilities may have changed, so get the new capabilities */
1097                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1098                                 goto bail;
1099                 }
1100 #endif
1101                 imap_info("Logging in...\n");
1102                 server_fill_credential(srvc, &cred);
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 (CAP(NOLOGIN)) {
1128                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1129                                         srvc->user, srvc->host);
1130                                 goto bail;
1131                         }
1132                         if (!imap->buf.sock.ssl)
1133                                 imap_warn("*** IMAP Warning *** Password is being "
1134                                           "sent in the clear\n");
1135                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1136                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1137                                 goto bail;
1138                         }
1139                 }
1140         } /* !preauth */
1141
1142         if (cred.username)
1143                 credential_approve(&cred);
1144         credential_clear(&cred);
1145
1146         /* check the target mailbox exists */
1147         ctx->name = folder;
1148         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1149         case RESP_OK:
1150                 /* ok */
1151                 break;
1152         case RESP_BAD:
1153                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1154                 goto out;
1155         case RESP_NO:
1156                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1157                         imap_info("Created missing mailbox\n");
1158                 } else {
1159                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1160                         goto out;
1161                 }
1162                 break;
1163         }
1164
1165         ctx->prefix = "";
1166         return ctx;
1167
1168 bail:
1169         if (cred.username)
1170                 credential_reject(&cred);
1171         credential_clear(&cred);
1172
1173  out:
1174         imap_close_store(ctx);
1175         return NULL;
1176 }
1177
1178 /*
1179  * Insert CR characters as necessary in *msg to ensure that every LF
1180  * character in *msg is preceded by a CR.
1181  */
1182 static void lf_to_crlf(struct strbuf *msg)
1183 {
1184         char *new_msg;
1185         size_t i, j;
1186         char lastc;
1187
1188         /* First pass: tally, in j, the size of the new_msg string: */
1189         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1190                 if (msg->buf[i] == '\n' && lastc != '\r')
1191                         j++; /* a CR will need to be added here */
1192                 lastc = msg->buf[i];
1193                 j++;
1194         }
1195
1196         new_msg = xmallocz(j);
1197
1198         /*
1199          * Second pass: write the new_msg string.  Note that this loop is
1200          * otherwise identical to the first pass.
1201          */
1202         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1203                 if (msg->buf[i] == '\n' && lastc != '\r')
1204                         new_msg[j++] = '\r';
1205                 lastc = new_msg[j++] = msg->buf[i];
1206         }
1207         strbuf_attach(msg, new_msg, j, j + 1);
1208 }
1209
1210 /*
1211  * Store msg to IMAP.  Also detach and free the data from msg->data,
1212  * leaving msg->data empty.
1213  */
1214 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1215 {
1216         struct imap *imap = ctx->imap;
1217         struct imap_cmd_cb cb;
1218         const char *prefix, *box;
1219         int ret;
1220
1221         lf_to_crlf(msg);
1222         memset(&cb, 0, sizeof(cb));
1223
1224         cb.dlen = msg->len;
1225         cb.data = strbuf_detach(msg, NULL);
1226
1227         box = ctx->name;
1228         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1229         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1230         imap->caps = imap->rcaps;
1231         if (ret != DRV_OK)
1232                 return ret;
1233
1234         return DRV_OK;
1235 }
1236
1237 static void wrap_in_html(struct strbuf *msg)
1238 {
1239         struct strbuf buf = STRBUF_INIT;
1240         static char *content_type = "Content-Type: text/html;\n";
1241         static char *pre_open = "<pre>\n";
1242         static char *pre_close = "</pre>\n";
1243         const char *body = strstr(msg->buf, "\n\n");
1244
1245         if (!body)
1246                 return; /* Headers but no body; no wrapping needed */
1247
1248         body += 2;
1249
1250         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1251         strbuf_addstr(&buf, content_type);
1252         strbuf_addch(&buf, '\n');
1253         strbuf_addstr(&buf, pre_open);
1254         strbuf_addstr_xml_quoted(&buf, body);
1255         strbuf_addstr(&buf, pre_close);
1256
1257         strbuf_release(msg);
1258         *msg = buf;
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 int git_imap_config(const char *var, const char *val,
1322                            const struct config_context *ctx, void *cb)
1323 {
1324
1325         if (!strcmp("imap.sslverify", var))
1326                 server.ssl_verify = git_config_bool(var, val);
1327         else if (!strcmp("imap.preformattedhtml", var))
1328                 server.use_html = git_config_bool(var, val);
1329         else if (!strcmp("imap.folder", var))
1330                 return git_config_string(&server.folder, var, val);
1331         else if (!strcmp("imap.user", var))
1332                 return git_config_string(&server.user, var, val);
1333         else if (!strcmp("imap.pass", var))
1334                 return git_config_string(&server.pass, var, val);
1335         else if (!strcmp("imap.tunnel", var))
1336                 return git_config_string(&server.tunnel, var, val);
1337         else if (!strcmp("imap.authmethod", var))
1338                 return git_config_string(&server.auth_method, var, val);
1339         else if (!strcmp("imap.port", var))
1340                 server.port = git_config_int(var, val, ctx->kvi);
1341         else if (!strcmp("imap.host", var)) {
1342                 if (!val) {
1343                         git_die_config("imap.host", "Missing value for 'imap.host'");
1344                 } else {
1345                         if (starts_with(val, "imap:"))
1346                                 val += 5;
1347                         else if (starts_with(val, "imaps:")) {
1348                                 val += 6;
1349                                 server.use_ssl = 1;
1350                         }
1351                         if (starts_with(val, "//"))
1352                                 val += 2;
1353                         server.host = xstrdup(val);
1354                 }
1355         } else
1356                 return git_default_config(var, val, ctx, cb);
1357
1358         return 0;
1359 }
1360
1361 static int append_msgs_to_imap(struct imap_server_conf *server,
1362                                struct strbuf* all_msgs, int total)
1363 {
1364         struct strbuf msg = STRBUF_INIT;
1365         struct imap_store *ctx = NULL;
1366         int ofs = 0;
1367         int r;
1368         int n = 0;
1369
1370         ctx = imap_open_store(server, server->folder);
1371         if (!ctx) {
1372                 fprintf(stderr, "failed to open store\n");
1373                 return 1;
1374         }
1375         ctx->name = server->folder;
1376
1377         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1378         while (1) {
1379                 unsigned percent = n * 100 / total;
1380
1381                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1382
1383                 if (!split_msg(all_msgs, &msg, &ofs))
1384                         break;
1385                 if (server->use_html)
1386                         wrap_in_html(&msg);
1387                 r = imap_store_msg(ctx, &msg);
1388                 if (r != DRV_OK)
1389                         break;
1390                 n++;
1391         }
1392         fprintf(stderr, "\n");
1393
1394         imap_close_store(ctx);
1395
1396         return 0;
1397 }
1398
1399 #ifdef USE_CURL_FOR_IMAP_SEND
1400 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1401 {
1402         CURL *curl;
1403         struct strbuf path = STRBUF_INIT;
1404         char *uri_encoded_folder;
1405
1406         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1407                 die("curl_global_init failed");
1408
1409         curl = curl_easy_init();
1410
1411         if (!curl)
1412                 die("curl_easy_init failed");
1413
1414         server_fill_credential(srvc, cred);
1415         curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
1416         curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
1417
1418         strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
1419         strbuf_addstr(&path, srvc->host);
1420         if (!path.len || path.buf[path.len - 1] != '/')
1421                 strbuf_addch(&path, '/');
1422
1423         uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
1424         if (!uri_encoded_folder)
1425                 die("failed to encode server folder");
1426         strbuf_addstr(&path, uri_encoded_folder);
1427         curl_free(uri_encoded_folder);
1428
1429         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1430         strbuf_release(&path);
1431         curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
1432
1433         if (srvc->auth_method) {
1434 #ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
1435                 warning("No LOGIN_OPTIONS support in this cURL version");
1436 #else
1437                 struct strbuf auth = STRBUF_INIT;
1438                 strbuf_addstr(&auth, "AUTH=");
1439                 strbuf_addstr(&auth, srvc->auth_method);
1440                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1441                 strbuf_release(&auth);
1442 #endif
1443         }
1444
1445         if (!srvc->use_ssl)
1446                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1447
1448         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
1449         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
1450
1451         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1452
1453         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1454
1455         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1456                 http_trace_curl_no_data();
1457         setup_curl_trace(curl);
1458
1459         return curl;
1460 }
1461
1462 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1463                                     struct strbuf* all_msgs, int total)
1464 {
1465         int ofs = 0;
1466         int n = 0;
1467         struct buffer msgbuf = { STRBUF_INIT, 0 };
1468         CURL *curl;
1469         CURLcode res = CURLE_OK;
1470         struct credential cred = CREDENTIAL_INIT;
1471
1472         curl = setup_curl(server, &cred);
1473         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1474
1475         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1476         while (1) {
1477                 unsigned percent = n * 100 / total;
1478                 int prev_len;
1479
1480                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1481
1482                 prev_len = msgbuf.buf.len;
1483                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1484                         break;
1485                 if (server->use_html)
1486                         wrap_in_html(&msgbuf.buf);
1487                 lf_to_crlf(&msgbuf.buf);
1488
1489                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1490                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1491
1492                 res = curl_easy_perform(curl);
1493
1494                 if(res != CURLE_OK) {
1495                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1496                                         curl_easy_strerror(res));
1497                         break;
1498                 }
1499
1500                 n++;
1501         }
1502         fprintf(stderr, "\n");
1503
1504         curl_easy_cleanup(curl);
1505         curl_global_cleanup();
1506
1507         if (cred.username) {
1508                 if (res == CURLE_OK)
1509                         credential_approve(&cred);
1510                 else if (res == CURLE_LOGIN_DENIED)
1511                         credential_reject(&cred);
1512         }
1513
1514         credential_clear(&cred);
1515
1516         return res != CURLE_OK;
1517 }
1518 #endif
1519
1520 int cmd_main(int argc, const char **argv)
1521 {
1522         struct strbuf all_msgs = STRBUF_INIT;
1523         int total;
1524         int nongit_ok;
1525
1526         setup_git_directory_gently(&nongit_ok);
1527         git_config(git_imap_config, NULL);
1528
1529         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1530
1531         if (argc)
1532                 usage_with_options(imap_send_usage, imap_send_options);
1533
1534 #ifndef USE_CURL_FOR_IMAP_SEND
1535         if (use_curl) {
1536                 warning("--curl not supported in this build");
1537                 use_curl = 0;
1538         }
1539 #elif defined(NO_OPENSSL)
1540         if (!use_curl) {
1541                 warning("--no-curl not supported in this build");
1542                 use_curl = 1;
1543         }
1544 #endif
1545
1546         if (!server.port)
1547                 server.port = server.use_ssl ? 993 : 143;
1548
1549         if (!server.folder) {
1550                 fprintf(stderr, "no imap store specified\n");
1551                 return 1;
1552         }
1553         if (!server.host) {
1554                 if (!server.tunnel) {
1555                         fprintf(stderr, "no imap host specified\n");
1556                         return 1;
1557                 }
1558                 server.host = "tunnel";
1559         }
1560
1561         /* read the messages */
1562         if (strbuf_read(&all_msgs, 0, 0) < 0) {
1563                 error_errno(_("could not read from stdin"));
1564                 return 1;
1565         }
1566
1567         if (all_msgs.len == 0) {
1568                 fprintf(stderr, "nothing to send\n");
1569                 return 1;
1570         }
1571
1572         total = count_messages(&all_msgs);
1573         if (!total) {
1574                 fprintf(stderr, "no messages to send\n");
1575                 return 1;
1576         }
1577
1578         /* write it to the imap server */
1579
1580         if (server.tunnel)
1581                 return append_msgs_to_imap(&server, &all_msgs, total);
1582
1583 #ifdef USE_CURL_FOR_IMAP_SEND
1584         if (use_curl)
1585                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1586 #endif
1587
1588         return append_msgs_to_imap(&server, &all_msgs, total);
1589 }