git.oblomov.eu Git - git/blob - 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 "cache.h"
  25 #include "config.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)
  38 /* Always default to curl if it's available. */
  39 #define USE_CURL_DEFAULT 1
  40 #else
  41 /* We don't have curl, so continue to use the historical implementation */
  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         meth = SSLv23_method();
 291         if (!meth) {
 292                 ssl_socket_perror("SSLv23_method");
 293                 return -1;
 294         }
 295
 296         ctx = SSL_CTX_new(meth);
 297         if (!ctx) {
 298                 ssl_socket_perror("SSL_CTX_new");
 299                 return -1;
 300         }
 301
 302         if (use_tls_only)
 303                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 304
 305         if (verify)
 306                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 307
 308         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 309                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 310                 return -1;
 311         }
 312         sock->ssl = SSL_new(ctx);
 313         if (!sock->ssl) {
 314                 ssl_socket_perror("SSL_new");
 315                 return -1;
 316         }
 317         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 318                 ssl_socket_perror("SSL_set_rfd");
 319                 return -1;
 320         }
 321         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 322                 ssl_socket_perror("SSL_set_wfd");
 323                 return -1;
 324         }
 325
 326 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 327         /*
 328          * SNI (RFC4366)
 329          * OpenSSL does not document this function, but the implementation
 330          * returns 1 on success, 0 on failure after calling SSLerr().
 331          */
 332         ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
 333         if (ret != 1)
 334                 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
 335 #endif
 336
 337         ret = SSL_connect(sock->ssl);
 338         if (ret <= 0) {
 339                 socket_perror("SSL_connect", sock, ret);
 340                 return -1;
 341         }
 342
 343         if (verify) {
 344                 /* make sure the hostname matches that of the certificate */
 345                 cert = SSL_get_peer_certificate(sock->ssl);
 346                 if (!cert)
 347                         return error("unable to get peer certificate.");
 348                 if (verify_hostname(cert, server.host) < 0)
 349                         return -1;
 350         }
 351
 352         return 0;
 353 }
 354 #endif
 355
 356 static int socket_read(struct imap_socket *sock, char *buf, int len)
 357 {
 358         ssize_t n;
 359 #ifndef NO_OPENSSL
 360         if (sock->ssl)
 361                 n = SSL_read(sock->ssl, buf, len);
 362         else
 363 #endif
 364                 n = xread(sock->fd[0], buf, len);
 365         if (n <= 0) {
 366                 socket_perror("read", sock, n);
 367                 close(sock->fd[0]);
 368                 close(sock->fd[1]);
 369                 sock->fd[0] = sock->fd[1] = -1;
 370         }
 371         return n;
 372 }
 373
 374 static int socket_write(struct imap_socket *sock, const char *buf, int len)
 375 {
 376         int n;
 377 #ifndef NO_OPENSSL
 378         if (sock->ssl)
 379                 n = SSL_write(sock->ssl, buf, len);
 380         else
 381 #endif
 382                 n = write_in_full(sock->fd[1], buf, len);
 383         if (n != len) {
 384                 socket_perror("write", sock, n);
 385                 close(sock->fd[0]);
 386                 close(sock->fd[1]);
 387                 sock->fd[0] = sock->fd[1] = -1;
 388         }
 389         return n;
 390 }
 391
 392 static void socket_shutdown(struct imap_socket *sock)
 393 {
 394 #ifndef NO_OPENSSL
 395         if (sock->ssl) {
 396                 SSL_shutdown(sock->ssl);
 397                 SSL_free(sock->ssl);
 398         }
 399 #endif
 400         close(sock->fd[0]);
 401         close(sock->fd[1]);
 402 }
 403
 404 /* simple line buffering */
 405 static int buffer_gets(struct imap_buffer *b, char **s)
 406 {
 407         int n;
 408         int start = b->offset;
 409
 410         *s = b->buf + start;
 411
 412         for (;;) {
 413                 /* make sure we have enough data to read the \r\n sequence */
 414                 if (b->offset + 1 >= b->bytes) {
 415                         if (start) {
 416                                 /* shift down used bytes */
 417                                 *s = b->buf;
 418
 419                                 assert(start <= b->bytes);
 420                                 n = b->bytes - start;
 421
 422                                 if (n)
 423                                         memmove(b->buf, b->buf + start, n);
 424                                 b->offset -= start;
 425                                 b->bytes = n;
 426                                 start = 0;
 427                         }
 428
 429                         n = socket_read(&b->sock, b->buf + b->bytes,
 430                                          sizeof(b->buf) - b->bytes);
 431
 432                         if (n <= 0)
 433                                 return -1;
 434
 435                         b->bytes += n;
 436                 }
 437
 438                 if (b->buf[b->offset] == '\r') {
 439                         assert(b->offset + 1 < b->bytes);
 440                         if (b->buf[b->offset + 1] == '\n') {
 441                                 b->buf[b->offset] = 0;  /* terminate the string */
 442                                 b->offset += 2; /* next line */
 443                                 if (0 < verbosity)
 444                                         puts(*s);
 445                                 return 0;
 446                         }
 447                 }
 448
 449                 b->offset++;
 450         }
 451         /* not reached */
 452 }
 453
 454 static void imap_info(const char *msg, ...)
 455 {
 456         va_list va;
 457
 458         if (0 <= verbosity) {
 459                 va_start(va, msg);
 460                 vprintf(msg, va);
 461                 va_end(va);
 462                 fflush(stdout);
 463         }
 464 }
 465
 466 static void imap_warn(const char *msg, ...)
 467 {
 468         va_list va;
 469
 470         if (-2 < verbosity) {
 471                 va_start(va, msg);
 472                 vfprintf(stderr, msg, va);
 473                 va_end(va);
 474         }
 475 }
 476
 477 static char *next_arg(char **s)
 478 {
 479         char *ret;
 480
 481         if (!s || !*s)
 482                 return NULL;
 483         while (isspace((unsigned char) **s))
 484                 (*s)++;
 485         if (!**s) {
 486                 *s = NULL;
 487                 return NULL;
 488         }
 489         if (**s == '"') {
 490                 ++*s;
 491                 ret = *s;
 492                 *s = strchr(*s, '"');
 493         } else {
 494                 ret = *s;
 495                 while (**s && !isspace((unsigned char) **s))
 496                         (*s)++;
 497         }
 498         if (*s) {
 499                 if (**s)
 500                         *(*s)++ = 0;
 501                 if (!**s)
 502                         *s = NULL;
 503         }
 504         return ret;
 505 }
 506
 507 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
 508 {
 509         int ret;
 510         va_list va;
 511
 512         va_start(va, fmt);
 513         if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
 514                 die("BUG: buffer too small. Please report a bug.");
 515         va_end(va);
 516         return ret;
 517 }
 518
 519 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 520                                        struct imap_cmd_cb *cb,
 521                                        const char *fmt, va_list ap)
 522 {
 523         struct imap *imap = ctx->imap;
 524         struct imap_cmd *cmd;
 525         int n, bufl;
 526         char buf[1024];
 527
 528         cmd = xmalloc(sizeof(struct imap_cmd));
 529         nfvasprintf(&cmd->cmd, fmt, ap);
 530         cmd->tag = ++imap->nexttag;
 531
 532         if (cb)
 533                 cmd->cb = *cb;
 534         else
 535                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 536
 537         while (imap->literal_pending)
 538                 get_cmd_result(ctx, NULL);
 539
 540         if (!cmd->cb.data)
 541                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
 542         else
 543                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
 544                                   cmd->tag, cmd->cmd, cmd->cb.dlen,
 545                                   CAP(LITERALPLUS) ? "+" : "");
 546
 547         if (0 < verbosity) {
 548                 if (imap->num_in_progress)
 549                         printf("(%d in progress) ", imap->num_in_progress);
 550                 if (!starts_with(cmd->cmd, "LOGIN"))
 551                         printf(">>> %s", buf);
 552                 else
 553                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 554         }
 555         if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
 556                 free(cmd->cmd);
 557                 free(cmd);
 558                 if (cb)
 559                         free(cb->data);
 560                 return NULL;
 561         }
 562         if (cmd->cb.data) {
 563                 if (CAP(LITERALPLUS)) {
 564                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 565                         free(cmd->cb.data);
 566                         if (n != cmd->cb.dlen ||
 567                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 568                                 free(cmd->cmd);
 569                                 free(cmd);
 570                                 return NULL;
 571                         }
 572                         cmd->cb.data = NULL;
 573                 } else
 574                         imap->literal_pending = 1;
 575         } else if (cmd->cb.cont)
 576                 imap->literal_pending = 1;
 577         cmd->next = NULL;
 578         *imap->in_progress_append = cmd;
 579         imap->in_progress_append = &cmd->next;
 580         imap->num_in_progress++;
 581         return cmd;
 582 }
 583
 584 __attribute__((format (printf, 3, 4)))
 585 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 586                      const char *fmt, ...)
 587 {
 588         va_list ap;
 589         struct imap_cmd *cmdp;
 590
 591         va_start(ap, fmt);
 592         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 593         va_end(ap);
 594         if (!cmdp)
 595                 return RESP_BAD;
 596
 597         return get_cmd_result(ctx, cmdp);
 598 }
 599
 600 __attribute__((format (printf, 3, 4)))
 601 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 602                        const char *fmt, ...)
 603 {
 604         va_list ap;
 605         struct imap_cmd *cmdp;
 606
 607         va_start(ap, fmt);
 608         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 609         va_end(ap);
 610         if (!cmdp)
 611                 return DRV_STORE_BAD;
 612
 613         switch (get_cmd_result(ctx, cmdp)) {
 614         case RESP_BAD: return DRV_STORE_BAD;
 615         case RESP_NO: return DRV_MSG_BAD;
 616         default: return DRV_OK;
 617         }
 618 }
 619
 620 static int skip_imap_list_l(char **sp, int level)
 621 {
 622         char *s = *sp;
 623
 624         for (;;) {
 625                 while (isspace((unsigned char)*s))
 626                         s++;
 627                 if (level && *s == ')') {
 628                         s++;
 629                         break;
 630                 }
 631                 if (*s == '(') {
 632                         /* sublist */
 633                         s++;
 634                         if (skip_imap_list_l(&s, level + 1))
 635                                 goto bail;
 636                 } else if (*s == '"') {
 637                         /* quoted string */
 638                         s++;
 639                         for (; *s != '"'; s++)
 640                                 if (!*s)
 641                                         goto bail;
 642                         s++;
 643                 } else {
 644                         /* atom */
 645                         for (; *s && !isspace((unsigned char)*s); s++)
 646                                 if (level && *s == ')')
 647                                         break;
 648                 }
 649
 650                 if (!level)
 651                         break;
 652                 if (!*s)
 653                         goto bail;
 654         }
 655         *sp = s;
 656         return 0;
 657
 658 bail:
 659         return -1;
 660 }
 661
 662 static void skip_list(char **sp)
 663 {
 664         skip_imap_list_l(sp, 0);
 665 }
 666
 667 static void parse_capability(struct imap *imap, char *cmd)
 668 {
 669         char *arg;
 670         unsigned i;
 671
 672         imap->caps = 0x80000000;
 673         while ((arg = next_arg(&cmd)))
 674                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 675                         if (!strcmp(cap_list[i], arg))
 676                                 imap->caps |= 1 << i;
 677         imap->rcaps = imap->caps;
 678 }
 679
 680 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 681                                char *s)
 682 {
 683         struct imap *imap = ctx->imap;
 684         char *arg, *p;
 685
 686         if (!s || *s != '[')
 687                 return RESP_OK;         /* no response code */
 688         s++;
 689         if (!(p = strchr(s, ']'))) {
 690                 fprintf(stderr, "IMAP error: malformed response code\n");
 691                 return RESP_BAD;
 692         }
 693         *p++ = 0;
 694         arg = next_arg(&s);
 695         if (!arg) {
 696                 fprintf(stderr, "IMAP error: empty response code\n");
 697                 return RESP_BAD;
 698         }
 699         if (!strcmp("UIDVALIDITY", arg)) {
 700                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 701                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 702                         return RESP_BAD;
 703                 }
 704         } else if (!strcmp("UIDNEXT", arg)) {
 705                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 706                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 707                         return RESP_BAD;
 708                 }
 709         } else if (!strcmp("CAPABILITY", arg)) {
 710                 parse_capability(imap, s);
 711         } else if (!strcmp("ALERT", arg)) {
 712                 /* RFC2060 says that these messages MUST be displayed
 713                  * to the user
 714                  */
 715                 for (; isspace((unsigned char)*p); p++);
 716                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 717         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 718                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 719                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 720                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 721                         return RESP_BAD;
 722                 }
 723         }
 724         return RESP_OK;
 725 }
 726
 727 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 728 {
 729         struct imap *imap = ctx->imap;
 730         struct imap_cmd *cmdp, **pcmdp;
 731         char *cmd;
 732         const char *arg, *arg1;
 733         int n, resp, resp2, tag;
 734
 735         for (;;) {
 736                 if (buffer_gets(&imap->buf, &cmd))
 737                         return RESP_BAD;
 738
 739                 arg = next_arg(&cmd);
 740                 if (!arg) {
 741                         fprintf(stderr, "IMAP error: empty response\n");
 742                         return RESP_BAD;
 743                 }
 744                 if (*arg == '*') {
 745                         arg = next_arg(&cmd);
 746                         if (!arg) {
 747                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 748                                 return RESP_BAD;
 749                         }
 750
 751                         if (!strcmp("NAMESPACE", arg)) {
 752                                 /* rfc2342 NAMESPACE response. */
 753                                 skip_list(&cmd); /* Personal mailboxes */
 754                                 skip_list(&cmd); /* Others' mailboxes */
 755                                 skip_list(&cmd); /* Shared mailboxes */
 756                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 757                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 758                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 759                                         return resp;
 760                         } else if (!strcmp("CAPABILITY", arg)) {
 761                                 parse_capability(imap, cmd);
 762                         } else if ((arg1 = next_arg(&cmd))) {
 763                                 ; /*
 764                                    * Unhandled response-data with at least two words.
 765                                    * Ignore it.
 766                                    *
 767                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 768                                    * and '<num> RECENT' but as a probably-unintended side
 769                                    * effect it ignores other unrecognized two-word
 770                                    * responses.  imap-send doesn't ever try to read
 771                                    * messages or mailboxes these days, so consider
 772                                    * eliminating this case.
 773                                    */
 774                         } else {
 775                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 776                                 return RESP_BAD;
 777                         }
 778                 } else if (!imap->in_progress) {
 779                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 780                         return RESP_BAD;
 781                 } else if (*arg == '+') {
 782                         /* This can happen only with the last command underway, as
 783                            it enforces a round-trip. */
 784                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 785                                offsetof(struct imap_cmd, next));
 786                         if (cmdp->cb.data) {
 787                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 788                                 FREE_AND_NULL(cmdp->cb.data);
 789                                 if (n != (int)cmdp->cb.dlen)
 790                                         return RESP_BAD;
 791                         } else if (cmdp->cb.cont) {
 792                                 if (cmdp->cb.cont(ctx, cmdp, cmd))
 793                                         return RESP_BAD;
 794                         } else {
 795                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 796                                 return RESP_BAD;
 797                         }
 798                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 799                                 return RESP_BAD;
 800                         if (!cmdp->cb.cont)
 801                                 imap->literal_pending = 0;
 802                         if (!tcmd)
 803                                 return DRV_OK;
 804                 } else {
 805                         tag = atoi(arg);
 806                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 807                                 if (cmdp->tag == tag)
 808                                         goto gottag;
 809                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 810                         return RESP_BAD;
 811                 gottag:
 812                         if (!(*pcmdp = cmdp->next))
 813                                 imap->in_progress_append = pcmdp;
 814                         imap->num_in_progress--;
 815                         if (cmdp->cb.cont || cmdp->cb.data)
 816                                 imap->literal_pending = 0;
 817                         arg = next_arg(&cmd);
 818                         if (!arg)
 819                                 arg = "";
 820                         if (!strcmp("OK", arg))
 821                                 resp = DRV_OK;
 822                         else {
 823                                 if (!strcmp("NO", arg))
 824                                         resp = RESP_NO;
 825                                 else /*if (!strcmp("BAD", arg))*/
 826                                         resp = RESP_BAD;
 827                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 828                                         !starts_with(cmdp->cmd, "LOGIN") ?
 829                                                         cmdp->cmd : "LOGIN <user> <pass>",
 830                                                         arg, cmd ? cmd : "");
 831                         }
 832                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 833                                 resp = resp2;
 834                         if (cmdp->cb.done)
 835                                 cmdp->cb.done(ctx, cmdp, resp);
 836                         free(cmdp->cb.data);
 837                         free(cmdp->cmd);
 838                         free(cmdp);
 839                         if (!tcmd || tcmd == cmdp)
 840                                 return resp;
 841                 }
 842         }
 843         /* not reached */
 844 }
 845
 846 static void imap_close_server(struct imap_store *ictx)
 847 {
 848         struct imap *imap = ictx->imap;
 849
 850         if (imap->buf.sock.fd[0] != -1) {
 851                 imap_exec(ictx, NULL, "LOGOUT");
 852                 socket_shutdown(&imap->buf.sock);
 853         }
 854         free(imap);
 855 }
 856
 857 static void imap_close_store(struct imap_store *ctx)
 858 {
 859         imap_close_server(ctx);
 860         free(ctx);
 861 }
 862
 863 #ifndef NO_OPENSSL
 864
 865 /*
 866  * hexchar() and cram() functions are based on the code from the isync
 867  * project (http://isync.sf.net/).
 868  */
 869 static char hexchar(unsigned int b)
 870 {
 871         return b < 10 ? '0' + b : 'a' + (b - 10);
 872 }
 873
 874 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 875 static char *cram(const char *challenge_64, const char *user, const char *pass)
 876 {
 877         int i, resp_len, encoded_len, decoded_len;
 878         unsigned char hash[16];
 879         char hex[33];
 880         char *response, *response_64, *challenge;
 881
 882         /*
 883          * length of challenge_64 (i.e. base-64 encoded string) is a good
 884          * enough upper bound for challenge (decoded result).
 885          */
 886         encoded_len = strlen(challenge_64);
 887         challenge = xmalloc(encoded_len);
 888         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 889                                       (unsigned char *)challenge_64, encoded_len);
 890         if (decoded_len < 0)
 891                 die("invalid challenge %s", challenge_64);
 892         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 893                 die("HMAC error");
 894
 895         hex[32] = 0;
 896         for (i = 0; i < 16; i++) {
 897                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 898                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 899         }
 900
 901         /* response: "<user> <digest in hex>" */
 902         response = xstrfmt("%s %s", user, hex);
 903         resp_len = strlen(response);
 904
 905         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 906         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 907                                       (unsigned char *)response, resp_len);
 908         if (encoded_len < 0)
 909                 die("EVP_EncodeBlock error");
 910         return (char *)response_64;
 911 }
 912
 913 #else
 914
 915 static char *cram(const char *challenge_64, const char *user, const char *pass)
 916 {
 917         die("If you want to use CRAM-MD5 authenticate method, "
 918             "you have to build git-imap-send with OpenSSL library.");
 919 }
 920
 921 #endif
 922
 923 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
 924 {
 925         int ret;
 926         char *response;
 927
 928         response = cram(prompt, server.user, server.pass);
 929
 930         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 931         if (ret != strlen(response))
 932                 return error("IMAP error: sending response failed");
 933
 934         free(response);
 935
 936         return 0;
 937 }
 938
 939 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 940 {
 941         if (srvc->user && srvc->pass)
 942                 return;
 943
 944         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 945         cred->host = xstrdup(srvc->host);
 946
 947         cred->username = xstrdup_or_null(srvc->user);
 948         cred->password = xstrdup_or_null(srvc->pass);
 949
 950         credential_fill(cred);
 951
 952         if (!srvc->user)
 953                 srvc->user = xstrdup(cred->username);
 954         if (!srvc->pass)
 955                 srvc->pass = xstrdup(cred->password);
 956 }
 957
 958 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, char *folder)
 959 {
 960         struct credential cred = CREDENTIAL_INIT;
 961         struct imap_store *ctx;
 962         struct imap *imap;
 963         char *arg, *rsp;
 964         int s = -1, preauth;
 965
 966         ctx = xcalloc(1, sizeof(*ctx));
 967
 968         ctx->imap = imap = xcalloc(1, sizeof(*imap));
 969         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 970         imap->in_progress_append = &imap->in_progress;
 971
 972         /* open connection to IMAP server */
 973
 974         if (srvc->tunnel) {
 975                 struct child_process tunnel = CHILD_PROCESS_INIT;
 976
 977                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 978
 979                 argv_array_push(&tunnel.args, srvc->tunnel);
 980                 tunnel.use_shell = 1;
 981                 tunnel.in = -1;
 982                 tunnel.out = -1;
 983                 if (start_command(&tunnel))
 984                         die("cannot start proxy %s", srvc->tunnel);
 985
 986                 imap->buf.sock.fd[0] = tunnel.out;
 987                 imap->buf.sock.fd[1] = tunnel.in;
 988
 989                 imap_info("ok\n");
 990         } else {
 991 #ifndef NO_IPV6
 992                 struct addrinfo hints, *ai0, *ai;
 993                 int gai;
 994                 char portstr[6];
 995
 996                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 997
 998                 memset(&hints, 0, sizeof(hints));
 999                 hints.ai_socktype = SOCK_STREAM;
1000                 hints.ai_protocol = IPPROTO_TCP;
1001
1002                 imap_info("Resolving %s... ", srvc->host);
1003                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
1004                 if (gai) {
1005                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
1006                         goto bail;
1007                 }
1008                 imap_info("ok\n");
1009
1010                 for (ai0 = ai; ai; ai = ai->ai_next) {
1011                         char addr[NI_MAXHOST];
1012
1013                         s = socket(ai->ai_family, ai->ai_socktype,
1014                                    ai->ai_protocol);
1015                         if (s < 0)
1016                                 continue;
1017
1018                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1019                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
1020                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
1021
1022                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1023                                 close(s);
1024                                 s = -1;
1025                                 perror("connect");
1026                                 continue;
1027                         }
1028
1029                         break;
1030                 }
1031                 freeaddrinfo(ai0);
1032 #else /* NO_IPV6 */
1033                 struct hostent *he;
1034                 struct sockaddr_in addr;
1035
1036                 memset(&addr, 0, sizeof(addr));
1037                 addr.sin_port = htons(srvc->port);
1038                 addr.sin_family = AF_INET;
1039
1040                 imap_info("Resolving %s... ", srvc->host);
1041                 he = gethostbyname(srvc->host);
1042                 if (!he) {
1043                         perror("gethostbyname");
1044                         goto bail;
1045                 }
1046                 imap_info("ok\n");
1047
1048                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1049
1050                 s = socket(PF_INET, SOCK_STREAM, 0);
1051
1052                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1053                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1054                         close(s);
1055                         s = -1;
1056                         perror("connect");
1057                 }
1058 #endif
1059                 if (s < 0) {
1060                         fputs("Error: unable to connect to server.\n", stderr);
1061                         goto bail;
1062                 }
1063
1064                 imap->buf.sock.fd[0] = s;
1065                 imap->buf.sock.fd[1] = dup(s);
1066
1067                 if (srvc->use_ssl &&
1068                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1069                         close(s);
1070                         goto bail;
1071                 }
1072                 imap_info("ok\n");
1073         }
1074
1075         /* read the greeting string */
1076         if (buffer_gets(&imap->buf, &rsp)) {
1077                 fprintf(stderr, "IMAP error: no greeting response\n");
1078                 goto bail;
1079         }
1080         arg = next_arg(&rsp);
1081         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1082                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1083                 goto bail;
1084         }
1085         preauth = 0;
1086         if (!strcmp("PREAUTH", arg))
1087                 preauth = 1;
1088         else if (strcmp("OK", arg) != 0) {
1089                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1090                 goto bail;
1091         }
1092         parse_response_code(ctx, NULL, rsp);
1093         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1094                 goto bail;
1095
1096         if (!preauth) {
1097 #ifndef NO_OPENSSL
1098                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1099                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1100                                 goto bail;
1101                         if (ssl_socket_connect(&imap->buf.sock, 1,
1102                                                srvc->ssl_verify))
1103                                 goto bail;
1104                         /* capabilities may have changed, so get the new capabilities */
1105                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1106                                 goto bail;
1107                 }
1108 #endif
1109                 imap_info("Logging in...\n");
1110                 server_fill_credential(srvc, &cred);
1111
1112                 if (srvc->auth_method) {
1113                         struct imap_cmd_cb cb;
1114
1115                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1116                                 if (!CAP(AUTH_CRAM_MD5)) {
1117                                         fprintf(stderr, "You specified"
1118                                                 "CRAM-MD5 as authentication method, "
1119                                                 "but %s doesn't support it.\n", srvc->host);
1120                                         goto bail;
1121                                 }
1122                                 /* CRAM-MD5 */
1123
1124                                 memset(&cb, 0, sizeof(cb));
1125                                 cb.cont = auth_cram_md5;
1126                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1127                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1128                                         goto bail;
1129                                 }
1130                         } else {
1131                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1132                                 goto bail;
1133                         }
1134                 } else {
1135                         if (CAP(NOLOGIN)) {
1136                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1137                                         srvc->user, srvc->host);
1138                                 goto bail;
1139                         }
1140                         if (!imap->buf.sock.ssl)
1141                                 imap_warn("*** IMAP Warning *** Password is being "
1142                                           "sent in the clear\n");
1143                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1144                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1145                                 goto bail;
1146                         }
1147                 }
1148         } /* !preauth */
1149
1150         if (cred.username)
1151                 credential_approve(&cred);
1152         credential_clear(&cred);
1153
1154         /* check the target mailbox exists */
1155         ctx->name = folder;
1156         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1157         case RESP_OK:
1158                 /* ok */
1159                 break;
1160         case RESP_BAD:
1161                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1162                 goto out;
1163         case RESP_NO:
1164                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1165                         imap_info("Created missing mailbox\n");
1166                 } else {
1167                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1168                         goto out;
1169                 }
1170                 break;
1171         }
1172
1173         ctx->prefix = "";
1174         return ctx;
1175
1176 bail:
1177         if (cred.username)
1178                 credential_reject(&cred);
1179         credential_clear(&cred);
1180
1181  out:
1182         imap_close_store(ctx);
1183         return NULL;
1184 }
1185
1186 /*
1187  * Insert CR characters as necessary in *msg to ensure that every LF
1188  * character in *msg is preceded by a CR.
1189  */
1190 static void lf_to_crlf(struct strbuf *msg)
1191 {
1192         char *new_msg;
1193         size_t i, j;
1194         char lastc;
1195
1196         /* First pass: tally, in j, the size of the new_msg string: */
1197         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1198                 if (msg->buf[i] == '\n' && lastc != '\r')
1199                         j++; /* a CR will need to be added here */
1200                 lastc = msg->buf[i];
1201                 j++;
1202         }
1203
1204         new_msg = xmallocz(j);
1205
1206         /*
1207          * Second pass: write the new_msg string.  Note that this loop is
1208          * otherwise identical to the first pass.
1209          */
1210         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1211                 if (msg->buf[i] == '\n' && lastc != '\r')
1212                         new_msg[j++] = '\r';
1213                 lastc = new_msg[j++] = msg->buf[i];
1214         }
1215         strbuf_attach(msg, new_msg, j, j + 1);
1216 }
1217
1218 /*
1219  * Store msg to IMAP.  Also detach and free the data from msg->data,
1220  * leaving msg->data empty.
1221  */
1222 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1223 {
1224         struct imap *imap = ctx->imap;
1225         struct imap_cmd_cb cb;
1226         const char *prefix, *box;
1227         int ret;
1228
1229         lf_to_crlf(msg);
1230         memset(&cb, 0, sizeof(cb));
1231
1232         cb.dlen = msg->len;
1233         cb.data = strbuf_detach(msg, NULL);
1234
1235         box = ctx->name;
1236         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1237         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1238         imap->caps = imap->rcaps;
1239         if (ret != DRV_OK)
1240                 return ret;
1241
1242         return DRV_OK;
1243 }
1244
1245 static void wrap_in_html(struct strbuf *msg)
1246 {
1247         struct strbuf buf = STRBUF_INIT;
1248         static char *content_type = "Content-Type: text/html;\n";
1249         static char *pre_open = "<pre>\n";
1250         static char *pre_close = "</pre>\n";
1251         const char *body = strstr(msg->buf, "\n\n");
1252
1253         if (!body)
1254                 return; /* Headers but no body; no wrapping needed */
1255
1256         body += 2;
1257
1258         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1259         strbuf_addstr(&buf, content_type);
1260         strbuf_addch(&buf, '\n');
1261         strbuf_addstr(&buf, pre_open);
1262         strbuf_addstr_xml_quoted(&buf, body);
1263         strbuf_addstr(&buf, pre_close);
1264
1265         strbuf_release(msg);
1266         *msg = buf;
1267 }
1268
1269 #define CHUNKSIZE 0x1000
1270
1271 static int read_message(FILE *f, struct strbuf *all_msgs)
1272 {
1273         do {
1274                 if (strbuf_fread(all_msgs, CHUNKSIZE, f) <= 0)
1275                         break;
1276         } while (!feof(f));
1277
1278         return ferror(f) ? -1 : 0;
1279 }
1280
1281 static int count_messages(struct strbuf *all_msgs)
1282 {
1283         int count = 0;
1284         char *p = all_msgs->buf;
1285
1286         while (1) {
1287                 if (starts_with(p, "From ")) {
1288                         p = strstr(p+5, "\nFrom: ");
1289                         if (!p) break;
1290                         p = strstr(p+7, "\nDate: ");
1291                         if (!p) break;
1292                         p = strstr(p+7, "\nSubject: ");
1293                         if (!p) break;
1294                         p += 10;
1295                         count++;
1296                 }
1297                 p = strstr(p+5, "\nFrom ");
1298                 if (!p)
1299                         break;
1300                 p++;
1301         }
1302         return count;
1303 }
1304
1305 /*
1306  * Copy the next message from all_msgs, starting at offset *ofs, to
1307  * msg.  Update *ofs to the start of the following message.  Return
1308  * true iff a message was successfully copied.
1309  */
1310 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1311 {
1312         char *p, *data;
1313         size_t len;
1314
1315         if (*ofs >= all_msgs->len)
1316                 return 0;
1317
1318         data = &all_msgs->buf[*ofs];
1319         len = all_msgs->len - *ofs;
1320
1321         if (len < 5 || !starts_with(data, "From "))
1322                 return 0;
1323
1324         p = strchr(data, '\n');
1325         if (p) {
1326                 p++;
1327                 len -= p - data;
1328                 *ofs += p - data;
1329                 data = p;
1330         }
1331
1332         p = strstr(data, "\nFrom ");
1333         if (p)
1334                 len = &p[1] - data;
1335
1336         strbuf_add(msg, data, len);
1337         *ofs += len;
1338         return 1;
1339 }
1340
1341 static void git_imap_config(void)
1342 {
1343         const char *val = NULL;
1344
1345         git_config_get_bool("imap.sslverify", &server.ssl_verify);
1346         git_config_get_bool("imap.preformattedhtml", &server.use_html);
1347         git_config_get_string("imap.folder", &server.folder);
1348
1349         if (!git_config_get_value("imap.host", &val)) {
1350                 if (!val) {
1351                         git_die_config("imap.host", "Missing value for 'imap.host'");
1352                 } else {
1353                         if (starts_with(val, "imap:"))
1354                                 val += 5;
1355                         else if (starts_with(val, "imaps:")) {
1356                                 val += 6;
1357                                 server.use_ssl = 1;
1358                         }
1359                         if (starts_with(val, "//"))
1360                                 val += 2;
1361                         server.host = xstrdup(val);
1362                 }
1363         }
1364
1365         git_config_get_string("imap.user", &server.user);
1366         git_config_get_string("imap.pass", &server.pass);
1367         git_config_get_int("imap.port", &server.port);
1368         git_config_get_string("imap.tunnel", &server.tunnel);
1369         git_config_get_string("imap.authmethod", &server.auth_method);
1370 }
1371
1372 static int append_msgs_to_imap(struct imap_server_conf *server,
1373                                struct strbuf* all_msgs, int total)
1374 {
1375         struct strbuf msg = STRBUF_INIT;
1376         struct imap_store *ctx = NULL;
1377         int ofs = 0;
1378         int r;
1379         int n = 0;
1380
1381         ctx = imap_open_store(server, server->folder);
1382         if (!ctx) {
1383                 fprintf(stderr, "failed to open store\n");
1384                 return 1;
1385         }
1386         ctx->name = server->folder;
1387
1388         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1389         while (1) {
1390                 unsigned percent = n * 100 / total;
1391
1392                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1393
1394                 if (!split_msg(all_msgs, &msg, &ofs))
1395                         break;
1396                 if (server->use_html)
1397                         wrap_in_html(&msg);
1398                 r = imap_store_msg(ctx, &msg);
1399                 if (r != DRV_OK)
1400                         break;
1401                 n++;
1402         }
1403         fprintf(stderr, "\n");
1404
1405         imap_close_store(ctx);
1406
1407         return 0;
1408 }
1409
1410 #ifdef USE_CURL_FOR_IMAP_SEND
1411 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1412 {
1413         CURL *curl;
1414         struct strbuf path = STRBUF_INIT;
1415         char *uri_encoded_folder;
1416
1417         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1418                 die("curl_global_init failed");
1419
1420         curl = curl_easy_init();
1421
1422         if (!curl)
1423                 die("curl_easy_init failed");
1424
1425         server_fill_credential(&server, cred);
1426         curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
1427         curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
1428
1429         strbuf_addstr(&path, server.use_ssl ? "imaps://" : "imap://");
1430         strbuf_addstr(&path, server.host);
1431         if (!path.len || path.buf[path.len - 1] != '/')
1432                 strbuf_addch(&path, '/');
1433
1434         uri_encoded_folder = curl_easy_escape(curl, server.folder, 0);
1435         if (!uri_encoded_folder)
1436                 die("failed to encode server folder");
1437         strbuf_addstr(&path, uri_encoded_folder);
1438         curl_free(uri_encoded_folder);
1439
1440         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1441         strbuf_release(&path);
1442         curl_easy_setopt(curl, CURLOPT_PORT, server.port);
1443
1444         if (server.auth_method) {
1445 #if LIBCURL_VERSION_NUM < 0x072200
1446                 warning("No LOGIN_OPTIONS support in this cURL version");
1447 #else
1448                 struct strbuf auth = STRBUF_INIT;
1449                 strbuf_addstr(&auth, "AUTH=");
1450                 strbuf_addstr(&auth, server.auth_method);
1451                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1452                 strbuf_release(&auth);
1453 #endif
1454         }
1455
1456         if (!server.use_ssl)
1457                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1458
1459         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
1460         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
1461
1462         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1463
1464         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1465
1466         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1467                 curl_easy_setopt(curl, CURLOPT_VERBOSE, 1L);
1468         setup_curl_trace(curl);
1469
1470         return curl;
1471 }
1472
1473 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1474                                     struct strbuf* all_msgs, int total) {
1475         int ofs = 0;
1476         int n = 0;
1477         struct buffer msgbuf = { STRBUF_INIT, 0 };
1478         CURL *curl;
1479         CURLcode res = CURLE_OK;
1480         struct credential cred = CREDENTIAL_INIT;
1481
1482         curl = setup_curl(server, &cred);
1483         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1484
1485         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1486         while (1) {
1487                 unsigned percent = n * 100 / total;
1488                 int prev_len;
1489
1490                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1491
1492                 prev_len = msgbuf.buf.len;
1493                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1494                         break;
1495                 if (server->use_html)
1496                         wrap_in_html(&msgbuf.buf);
1497                 lf_to_crlf(&msgbuf.buf);
1498
1499                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1500                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1501
1502                 res = curl_easy_perform(curl);
1503
1504                 if(res != CURLE_OK) {
1505                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1506                                         curl_easy_strerror(res));
1507                         break;
1508                 }
1509
1510                 n++;
1511         }
1512         fprintf(stderr, "\n");
1513
1514         curl_easy_cleanup(curl);
1515         curl_global_cleanup();
1516
1517         if (cred.username) {
1518                 if (res == CURLE_OK)
1519                         credential_approve(&cred);
1520 #if LIBCURL_VERSION_NUM >= 0x070d01
1521                 else if (res == CURLE_LOGIN_DENIED)
1522 #else
1523                 else
1524 #endif
1525                         credential_reject(&cred);
1526         }
1527
1528         credential_clear(&cred);
1529
1530         return res != CURLE_OK;
1531 }
1532 #endif
1533
1534 int cmd_main(int argc, const char **argv)
1535 {
1536         struct strbuf all_msgs = STRBUF_INIT;
1537         int total;
1538         int nongit_ok;
1539
1540         setup_git_directory_gently(&nongit_ok);
1541         git_imap_config();
1542
1543         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1544
1545         if (argc)
1546                 usage_with_options(imap_send_usage, imap_send_options);
1547
1548 #ifndef USE_CURL_FOR_IMAP_SEND
1549         if (use_curl) {
1550                 warning("--curl not supported in this build");
1551                 use_curl = 0;
1552         }
1553 #elif defined(NO_OPENSSL)
1554         if (!use_curl) {
1555                 warning("--no-curl not supported in this build");
1556                 use_curl = 1;
1557         }
1558 #endif
1559
1560         if (!server.port)
1561                 server.port = server.use_ssl ? 993 : 143;
1562
1563         if (!server.folder) {
1564                 fprintf(stderr, "no imap store specified\n");
1565                 return 1;
1566         }
1567         if (!server.host) {
1568                 if (!server.tunnel) {
1569                         fprintf(stderr, "no imap host specified\n");
1570                         return 1;
1571                 }
1572                 server.host = "tunnel";
1573         }
1574
1575         /* read the messages */
1576         if (read_message(stdin, &all_msgs)) {
1577                 fprintf(stderr, "error reading input\n");
1578                 return 1;
1579         }
1580
1581         if (all_msgs.len == 0) {
1582                 fprintf(stderr, "nothing to send\n");
1583                 return 1;
1584         }
1585
1586         total = count_messages(&all_msgs);
1587         if (!total) {
1588                 fprintf(stderr, "no messages to send\n");
1589                 return 1;
1590         }
1591
1592         /* write it to the imap server */
1593
1594         if (server.tunnel)
1595                 return append_msgs_to_imap(&server, &all_msgs, total);
1596
1597 #ifdef USE_CURL_FOR_IMAP_SEND
1598         if (use_curl)
1599                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1600 #endif
1601
1602         return append_msgs_to_imap(&server, &all_msgs, total);
1603 }