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 "wrapper.h"
  32 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
  33 typedef void *SSL;
  34 #endif
  35 #ifdef USE_CURL_FOR_IMAP_SEND
  36 #include "http.h"
  37 #endif
  38
  39 #if defined(USE_CURL_FOR_IMAP_SEND)
  40 /* Always default to curl if it's available. */
  41 #define USE_CURL_DEFAULT 1
  42 #else
  43 /* We don't have curl, so continue to use the historical implementation */
  44 #define USE_CURL_DEFAULT 0
  45 #endif
  46
  47 static int verbosity;
  48 static int use_curl = USE_CURL_DEFAULT;
  49
  50 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
  51
  52 static struct option imap_send_options[] = {
  53         OPT__VERBOSITY(&verbosity),
  54         OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
  55         OPT_END()
  56 };
  57
  58 #undef DRV_OK
  59 #define DRV_OK          0
  60 #define DRV_MSG_BAD     -1
  61 #define DRV_BOX_BAD     -2
  62 #define DRV_STORE_BAD   -3
  63
  64 __attribute__((format (printf, 1, 2)))
  65 static void imap_info(const char *, ...);
  66 __attribute__((format (printf, 1, 2)))
  67 static void imap_warn(const char *, ...);
  68
  69 static char *next_arg(char **);
  70
  71 __attribute__((format (printf, 3, 4)))
  72 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
  73
  74 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
  75 {
  76         int len;
  77         char tmp[8192];
  78
  79         len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
  80         if (len < 0)
  81                 die("Fatal: Out of memory");
  82         if (len >= sizeof(tmp))
  83                 die("imap command overflow!");
  84         *strp = xmemdupz(tmp, len);
  85         return len;
  86 }
  87
  88 struct imap_server_conf {
  89         const char *name;
  90         const char *tunnel;
  91         const char *host;
  92         int port;
  93         const char *folder;
  94         const char *user;
  95         const char *pass;
  96         int use_ssl;
  97         int ssl_verify;
  98         int use_html;
  99         const char *auth_method;
 100 };
 101
 102 static struct imap_server_conf server = {
 103         .ssl_verify = 1,
 104 };
 105
 106 struct imap_socket {
 107         int fd[2];
 108         SSL *ssl;
 109 };
 110
 111 struct imap_buffer {
 112         struct imap_socket sock;
 113         int bytes;
 114         int offset;
 115         char buf[1024];
 116 };
 117
 118 struct imap_cmd;
 119
 120 struct imap {
 121         int uidnext; /* from SELECT responses */
 122         unsigned caps, rcaps; /* CAPABILITY results */
 123         /* command queue */
 124         int nexttag, num_in_progress, literal_pending;
 125         struct imap_cmd *in_progress, **in_progress_append;
 126         struct imap_buffer buf; /* this is BIG, so put it last */
 127 };
 128
 129 struct imap_store {
 130         /* currently open mailbox */
 131         const char *name; /* foreign! maybe preset? */
 132         int uidvalidity;
 133         struct imap *imap;
 134         const char *prefix;
 135 };
 136
 137 struct imap_cmd_cb {
 138         int (*cont)(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt);
 139         void (*done)(struct imap_store *ctx, struct imap_cmd *cmd, int response);
 140         void *ctx;
 141         char *data;
 142         int dlen;
 143         int uid;
 144 };
 145
 146 struct imap_cmd {
 147         struct imap_cmd *next;
 148         struct imap_cmd_cb cb;
 149         char *cmd;
 150         int tag;
 151 };
 152
 153 #define CAP(cap) (imap->caps & (1 << (cap)))
 154
 155 enum CAPABILITY {
 156         NOLOGIN = 0,
 157         UIDPLUS,
 158         LITERALPLUS,
 159         NAMESPACE,
 160         STARTTLS,
 161         AUTH_CRAM_MD5
 162 };
 163
 164 static const char *cap_list[] = {
 165         "LOGINDISABLED",
 166         "UIDPLUS",
 167         "LITERAL+",
 168         "NAMESPACE",
 169         "STARTTLS",
 170         "AUTH=CRAM-MD5",
 171 };
 172
 173 #define RESP_OK    0
 174 #define RESP_NO    1
 175 #define RESP_BAD   2
 176
 177 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 178
 179
 180 #ifndef NO_OPENSSL
 181 static void ssl_socket_perror(const char *func)
 182 {
 183         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 184 }
 185 #endif
 186
 187 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 188 {
 189 #ifndef NO_OPENSSL
 190         if (sock->ssl) {
 191                 int sslerr = SSL_get_error(sock->ssl, ret);
 192                 switch (sslerr) {
 193                 case SSL_ERROR_NONE:
 194                         break;
 195                 case SSL_ERROR_SYSCALL:
 196                         perror("SSL_connect");
 197                         break;
 198                 default:
 199                         ssl_socket_perror("SSL_connect");
 200                         break;
 201                 }
 202         } else
 203 #endif
 204         {
 205                 if (ret < 0)
 206                         perror(func);
 207                 else
 208                         fprintf(stderr, "%s: unexpected EOF\n", func);
 209         }
 210 }
 211
 212 #ifdef NO_OPENSSL
 213 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 214 {
 215         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 216         return -1;
 217 }
 218
 219 #else
 220
 221 static int host_matches(const char *host, const char *pattern)
 222 {
 223         if (pattern[0] == '*' && pattern[1] == '.') {
 224                 pattern += 2;
 225                 if (!(host = strchr(host, '.')))
 226                         return 0;
 227                 host++;
 228         }
 229
 230         return *host && *pattern && !strcasecmp(host, pattern);
 231 }
 232
 233 static int verify_hostname(X509 *cert, const char *hostname)
 234 {
 235         int len;
 236         X509_NAME *subj;
 237         char cname[1000];
 238         int i, found;
 239         STACK_OF(GENERAL_NAME) *subj_alt_names;
 240
 241         /* try the DNS subjectAltNames */
 242         found = 0;
 243         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
 244                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
 245                 for (i = 0; !found && i < num_subj_alt_names; i++) {
 246                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 247                         if (subj_alt_name->type == GEN_DNS &&
 248                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
 249                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
 250                                 found = 1;
 251                 }
 252                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
 253         }
 254         if (found)
 255                 return 0;
 256
 257         /* try the common name */
 258         if (!(subj = X509_get_subject_name(cert)))
 259                 return error("cannot get certificate subject");
 260         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
 261                 return error("cannot get certificate common name");
 262         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
 263                 return 0;
 264         return error("certificate owner '%s' does not match hostname '%s'",
 265                      cname, hostname);
 266 }
 267
 268 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 269 {
 270 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 271         const SSL_METHOD *meth;
 272 #else
 273         SSL_METHOD *meth;
 274 #endif
 275         SSL_CTX *ctx;
 276         int ret;
 277         X509 *cert;
 278
 279         SSL_library_init();
 280         SSL_load_error_strings();
 281
 282         meth = SSLv23_method();
 283         if (!meth) {
 284                 ssl_socket_perror("SSLv23_method");
 285                 return -1;
 286         }
 287
 288         ctx = SSL_CTX_new(meth);
 289         if (!ctx) {
 290                 ssl_socket_perror("SSL_CTX_new");
 291                 return -1;
 292         }
 293
 294         if (use_tls_only)
 295                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 296
 297         if (verify)
 298                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 299
 300         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 301                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 302                 return -1;
 303         }
 304         sock->ssl = SSL_new(ctx);
 305         if (!sock->ssl) {
 306                 ssl_socket_perror("SSL_new");
 307                 return -1;
 308         }
 309         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 310                 ssl_socket_perror("SSL_set_rfd");
 311                 return -1;
 312         }
 313         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 314                 ssl_socket_perror("SSL_set_wfd");
 315                 return -1;
 316         }
 317
 318 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 319         /*
 320          * SNI (RFC4366)
 321          * OpenSSL does not document this function, but the implementation
 322          * returns 1 on success, 0 on failure after calling SSLerr().
 323          */
 324         ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
 325         if (ret != 1)
 326                 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
 327 #endif
 328
 329         ret = SSL_connect(sock->ssl);
 330         if (ret <= 0) {
 331                 socket_perror("SSL_connect", sock, ret);
 332                 return -1;
 333         }
 334
 335         if (verify) {
 336                 /* make sure the hostname matches that of the certificate */
 337                 cert = SSL_get_peer_certificate(sock->ssl);
 338                 if (!cert)
 339                         return error("unable to get peer certificate.");
 340                 if (verify_hostname(cert, server.host) < 0)
 341                         return -1;
 342         }
 343
 344         return 0;
 345 }
 346 #endif
 347
 348 static int socket_read(struct imap_socket *sock, char *buf, int len)
 349 {
 350         ssize_t n;
 351 #ifndef NO_OPENSSL
 352         if (sock->ssl)
 353                 n = SSL_read(sock->ssl, buf, len);
 354         else
 355 #endif
 356                 n = xread(sock->fd[0], buf, len);
 357         if (n <= 0) {
 358                 socket_perror("read", sock, n);
 359                 close(sock->fd[0]);
 360                 close(sock->fd[1]);
 361                 sock->fd[0] = sock->fd[1] = -1;
 362         }
 363         return n;
 364 }
 365
 366 static int socket_write(struct imap_socket *sock, const char *buf, int len)
 367 {
 368         int n;
 369 #ifndef NO_OPENSSL
 370         if (sock->ssl)
 371                 n = SSL_write(sock->ssl, buf, len);
 372         else
 373 #endif
 374                 n = write_in_full(sock->fd[1], buf, len);
 375         if (n != len) {
 376                 socket_perror("write", sock, n);
 377                 close(sock->fd[0]);
 378                 close(sock->fd[1]);
 379                 sock->fd[0] = sock->fd[1] = -1;
 380         }
 381         return n;
 382 }
 383
 384 static void socket_shutdown(struct imap_socket *sock)
 385 {
 386 #ifndef NO_OPENSSL
 387         if (sock->ssl) {
 388                 SSL_shutdown(sock->ssl);
 389                 SSL_free(sock->ssl);
 390         }
 391 #endif
 392         close(sock->fd[0]);
 393         close(sock->fd[1]);
 394 }
 395
 396 /* simple line buffering */
 397 static int buffer_gets(struct imap_buffer *b, char **s)
 398 {
 399         int n;
 400         int start = b->offset;
 401
 402         *s = b->buf + start;
 403
 404         for (;;) {
 405                 /* make sure we have enough data to read the \r\n sequence */
 406                 if (b->offset + 1 >= b->bytes) {
 407                         if (start) {
 408                                 /* shift down used bytes */
 409                                 *s = b->buf;
 410
 411                                 assert(start <= b->bytes);
 412                                 n = b->bytes - start;
 413
 414                                 if (n)
 415                                         memmove(b->buf, b->buf + start, n);
 416                                 b->offset -= start;
 417                                 b->bytes = n;
 418                                 start = 0;
 419                         }
 420
 421                         n = socket_read(&b->sock, b->buf + b->bytes,
 422                                          sizeof(b->buf) - b->bytes);
 423
 424                         if (n <= 0)
 425                                 return -1;
 426
 427                         b->bytes += n;
 428                 }
 429
 430                 if (b->buf[b->offset] == '\r') {
 431                         assert(b->offset + 1 < b->bytes);
 432                         if (b->buf[b->offset + 1] == '\n') {
 433                                 b->buf[b->offset] = 0;  /* terminate the string */
 434                                 b->offset += 2; /* next line */
 435                                 if (0 < verbosity)
 436                                         puts(*s);
 437                                 return 0;
 438                         }
 439                 }
 440
 441                 b->offset++;
 442         }
 443         /* not reached */
 444 }
 445
 446 __attribute__((format (printf, 1, 2)))
 447 static void imap_info(const char *msg, ...)
 448 {
 449         va_list va;
 450
 451         if (0 <= verbosity) {
 452                 va_start(va, msg);
 453                 vprintf(msg, va);
 454                 va_end(va);
 455                 fflush(stdout);
 456         }
 457 }
 458
 459 __attribute__((format (printf, 1, 2)))
 460 static void imap_warn(const char *msg, ...)
 461 {
 462         va_list va;
 463
 464         if (-2 < verbosity) {
 465                 va_start(va, msg);
 466                 vfprintf(stderr, msg, va);
 467                 va_end(va);
 468         }
 469 }
 470
 471 static char *next_arg(char **s)
 472 {
 473         char *ret;
 474
 475         if (!s || !*s)
 476                 return NULL;
 477         while (isspace((unsigned char) **s))
 478                 (*s)++;
 479         if (!**s) {
 480                 *s = NULL;
 481                 return NULL;
 482         }
 483         if (**s == '"') {
 484                 ++*s;
 485                 ret = *s;
 486                 *s = strchr(*s, '"');
 487         } else {
 488                 ret = *s;
 489                 while (**s && !isspace((unsigned char) **s))
 490                         (*s)++;
 491         }
 492         if (*s) {
 493                 if (**s)
 494                         *(*s)++ = 0;
 495                 if (!**s)
 496                         *s = NULL;
 497         }
 498         return ret;
 499 }
 500
 501 __attribute__((format (printf, 3, 4)))
 502 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
 503 {
 504         int ret;
 505         va_list va;
 506
 507         va_start(va, fmt);
 508         if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
 509                 BUG("buffer too small. Please report a bug.");
 510         va_end(va);
 511         return ret;
 512 }
 513
 514 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 515                                        struct imap_cmd_cb *cb,
 516                                        const char *fmt, va_list ap)
 517 {
 518         struct imap *imap = ctx->imap;
 519         struct imap_cmd *cmd;
 520         int n, bufl;
 521         char buf[1024];
 522
 523         cmd = xmalloc(sizeof(struct imap_cmd));
 524         nfvasprintf(&cmd->cmd, fmt, ap);
 525         cmd->tag = ++imap->nexttag;
 526
 527         if (cb)
 528                 cmd->cb = *cb;
 529         else
 530                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 531
 532         while (imap->literal_pending)
 533                 get_cmd_result(ctx, NULL);
 534
 535         if (!cmd->cb.data)
 536                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
 537         else
 538                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
 539                                   cmd->tag, cmd->cmd, cmd->cb.dlen,
 540                                   CAP(LITERALPLUS) ? "+" : "");
 541
 542         if (0 < verbosity) {
 543                 if (imap->num_in_progress)
 544                         printf("(%d in progress) ", imap->num_in_progress);
 545                 if (!starts_with(cmd->cmd, "LOGIN"))
 546                         printf(">>> %s", buf);
 547                 else
 548                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 549         }
 550         if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
 551                 free(cmd->cmd);
 552                 free(cmd);
 553                 if (cb)
 554                         free(cb->data);
 555                 return NULL;
 556         }
 557         if (cmd->cb.data) {
 558                 if (CAP(LITERALPLUS)) {
 559                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 560                         free(cmd->cb.data);
 561                         if (n != cmd->cb.dlen ||
 562                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 563                                 free(cmd->cmd);
 564                                 free(cmd);
 565                                 return NULL;
 566                         }
 567                         cmd->cb.data = NULL;
 568                 } else
 569                         imap->literal_pending = 1;
 570         } else if (cmd->cb.cont)
 571                 imap->literal_pending = 1;
 572         cmd->next = NULL;
 573         *imap->in_progress_append = cmd;
 574         imap->in_progress_append = &cmd->next;
 575         imap->num_in_progress++;
 576         return cmd;
 577 }
 578
 579 __attribute__((format (printf, 3, 4)))
 580 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 581                      const char *fmt, ...)
 582 {
 583         va_list ap;
 584         struct imap_cmd *cmdp;
 585
 586         va_start(ap, fmt);
 587         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 588         va_end(ap);
 589         if (!cmdp)
 590                 return RESP_BAD;
 591
 592         return get_cmd_result(ctx, cmdp);
 593 }
 594
 595 __attribute__((format (printf, 3, 4)))
 596 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 597                        const char *fmt, ...)
 598 {
 599         va_list ap;
 600         struct imap_cmd *cmdp;
 601
 602         va_start(ap, fmt);
 603         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 604         va_end(ap);
 605         if (!cmdp)
 606                 return DRV_STORE_BAD;
 607
 608         switch (get_cmd_result(ctx, cmdp)) {
 609         case RESP_BAD: return DRV_STORE_BAD;
 610         case RESP_NO: return DRV_MSG_BAD;
 611         default: return DRV_OK;
 612         }
 613 }
 614
 615 static int skip_imap_list_l(char **sp, int level)
 616 {
 617         char *s = *sp;
 618
 619         for (;;) {
 620                 while (isspace((unsigned char)*s))
 621                         s++;
 622                 if (level && *s == ')') {
 623                         s++;
 624                         break;
 625                 }
 626                 if (*s == '(') {
 627                         /* sublist */
 628                         s++;
 629                         if (skip_imap_list_l(&s, level + 1))
 630                                 goto bail;
 631                 } else if (*s == '"') {
 632                         /* quoted string */
 633                         s++;
 634                         for (; *s != '"'; s++)
 635                                 if (!*s)
 636                                         goto bail;
 637                         s++;
 638                 } else {
 639                         /* atom */
 640                         for (; *s && !isspace((unsigned char)*s); s++)
 641                                 if (level && *s == ')')
 642                                         break;
 643                 }
 644
 645                 if (!level)
 646                         break;
 647                 if (!*s)
 648                         goto bail;
 649         }
 650         *sp = s;
 651         return 0;
 652
 653 bail:
 654         return -1;
 655 }
 656
 657 static void skip_list(char **sp)
 658 {
 659         skip_imap_list_l(sp, 0);
 660 }
 661
 662 static void parse_capability(struct imap *imap, char *cmd)
 663 {
 664         char *arg;
 665         unsigned i;
 666
 667         imap->caps = 0x80000000;
 668         while ((arg = next_arg(&cmd)))
 669                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 670                         if (!strcmp(cap_list[i], arg))
 671                                 imap->caps |= 1 << i;
 672         imap->rcaps = imap->caps;
 673 }
 674
 675 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 676                                char *s)
 677 {
 678         struct imap *imap = ctx->imap;
 679         char *arg, *p;
 680
 681         if (!s || *s != '[')
 682                 return RESP_OK;         /* no response code */
 683         s++;
 684         if (!(p = strchr(s, ']'))) {
 685                 fprintf(stderr, "IMAP error: malformed response code\n");
 686                 return RESP_BAD;
 687         }
 688         *p++ = 0;
 689         arg = next_arg(&s);
 690         if (!arg) {
 691                 fprintf(stderr, "IMAP error: empty response code\n");
 692                 return RESP_BAD;
 693         }
 694         if (!strcmp("UIDVALIDITY", arg)) {
 695                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 696                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 697                         return RESP_BAD;
 698                 }
 699         } else if (!strcmp("UIDNEXT", arg)) {
 700                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 701                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 702                         return RESP_BAD;
 703                 }
 704         } else if (!strcmp("CAPABILITY", arg)) {
 705                 parse_capability(imap, s);
 706         } else if (!strcmp("ALERT", arg)) {
 707                 /* RFC2060 says that these messages MUST be displayed
 708                  * to the user
 709                  */
 710                 for (; isspace((unsigned char)*p); p++);
 711                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 712         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 713                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 714                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 715                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 716                         return RESP_BAD;
 717                 }
 718         }
 719         return RESP_OK;
 720 }
 721
 722 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 723 {
 724         struct imap *imap = ctx->imap;
 725         struct imap_cmd *cmdp, **pcmdp;
 726         char *cmd;
 727         const char *arg, *arg1;
 728         int n, resp, resp2, tag;
 729
 730         for (;;) {
 731                 if (buffer_gets(&imap->buf, &cmd))
 732                         return RESP_BAD;
 733
 734                 arg = next_arg(&cmd);
 735                 if (!arg) {
 736                         fprintf(stderr, "IMAP error: empty response\n");
 737                         return RESP_BAD;
 738                 }
 739                 if (*arg == '*') {
 740                         arg = next_arg(&cmd);
 741                         if (!arg) {
 742                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 743                                 return RESP_BAD;
 744                         }
 745
 746                         if (!strcmp("NAMESPACE", arg)) {
 747                                 /* rfc2342 NAMESPACE response. */
 748                                 skip_list(&cmd); /* Personal mailboxes */
 749                                 skip_list(&cmd); /* Others' mailboxes */
 750                                 skip_list(&cmd); /* Shared mailboxes */
 751                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 752                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 753                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 754                                         return resp;
 755                         } else if (!strcmp("CAPABILITY", arg)) {
 756                                 parse_capability(imap, cmd);
 757                         } else if ((arg1 = next_arg(&cmd))) {
 758                                 ; /*
 759                                    * Unhandled response-data with at least two words.
 760                                    * Ignore it.
 761                                    *
 762                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 763                                    * and '<num> RECENT' but as a probably-unintended side
 764                                    * effect it ignores other unrecognized two-word
 765                                    * responses.  imap-send doesn't ever try to read
 766                                    * messages or mailboxes these days, so consider
 767                                    * eliminating this case.
 768                                    */
 769                         } else {
 770                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 771                                 return RESP_BAD;
 772                         }
 773                 } else if (!imap->in_progress) {
 774                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 775                         return RESP_BAD;
 776                 } else if (*arg == '+') {
 777                         /* This can happen only with the last command underway, as
 778                            it enforces a round-trip. */
 779                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 780                                offsetof(struct imap_cmd, next));
 781                         if (cmdp->cb.data) {
 782                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 783                                 FREE_AND_NULL(cmdp->cb.data);
 784                                 if (n != (int)cmdp->cb.dlen)
 785                                         return RESP_BAD;
 786                         } else if (cmdp->cb.cont) {
 787                                 if (cmdp->cb.cont(ctx, cmdp, cmd))
 788                                         return RESP_BAD;
 789                         } else {
 790                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 791                                 return RESP_BAD;
 792                         }
 793                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 794                                 return RESP_BAD;
 795                         if (!cmdp->cb.cont)
 796                                 imap->literal_pending = 0;
 797                         if (!tcmd)
 798                                 return DRV_OK;
 799                 } else {
 800                         tag = atoi(arg);
 801                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 802                                 if (cmdp->tag == tag)
 803                                         goto gottag;
 804                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 805                         return RESP_BAD;
 806                 gottag:
 807                         if (!(*pcmdp = cmdp->next))
 808                                 imap->in_progress_append = pcmdp;
 809                         imap->num_in_progress--;
 810                         if (cmdp->cb.cont || cmdp->cb.data)
 811                                 imap->literal_pending = 0;
 812                         arg = next_arg(&cmd);
 813                         if (!arg)
 814                                 arg = "";
 815                         if (!strcmp("OK", arg))
 816                                 resp = DRV_OK;
 817                         else {
 818                                 if (!strcmp("NO", arg))
 819                                         resp = RESP_NO;
 820                                 else /*if (!strcmp("BAD", arg))*/
 821                                         resp = RESP_BAD;
 822                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 823                                         !starts_with(cmdp->cmd, "LOGIN") ?
 824                                                         cmdp->cmd : "LOGIN <user> <pass>",
 825                                                         arg, cmd ? cmd : "");
 826                         }
 827                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 828                                 resp = resp2;
 829                         if (cmdp->cb.done)
 830                                 cmdp->cb.done(ctx, cmdp, resp);
 831                         free(cmdp->cb.data);
 832                         free(cmdp->cmd);
 833                         free(cmdp);
 834                         if (!tcmd || tcmd == cmdp)
 835                                 return resp;
 836                 }
 837         }
 838         /* not reached */
 839 }
 840
 841 static void imap_close_server(struct imap_store *ictx)
 842 {
 843         struct imap *imap = ictx->imap;
 844
 845         if (imap->buf.sock.fd[0] != -1) {
 846                 imap_exec(ictx, NULL, "LOGOUT");
 847                 socket_shutdown(&imap->buf.sock);
 848         }
 849         free(imap);
 850 }
 851
 852 static void imap_close_store(struct imap_store *ctx)
 853 {
 854         imap_close_server(ctx);
 855         free(ctx);
 856 }
 857
 858 #ifndef NO_OPENSSL
 859
 860 /*
 861  * hexchar() and cram() functions are based on the code from the isync
 862  * project (http://isync.sf.net/).
 863  */
 864 static char hexchar(unsigned int b)
 865 {
 866         return b < 10 ? '0' + b : 'a' + (b - 10);
 867 }
 868
 869 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 870 static char *cram(const char *challenge_64, const char *user, const char *pass)
 871 {
 872         int i, resp_len, encoded_len, decoded_len;
 873         unsigned char hash[16];
 874         char hex[33];
 875         char *response, *response_64, *challenge;
 876
 877         /*
 878          * length of challenge_64 (i.e. base-64 encoded string) is a good
 879          * enough upper bound for challenge (decoded result).
 880          */
 881         encoded_len = strlen(challenge_64);
 882         challenge = xmalloc(encoded_len);
 883         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 884                                       (unsigned char *)challenge_64, encoded_len);
 885         if (decoded_len < 0)
 886                 die("invalid challenge %s", challenge_64);
 887         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 888                 die("HMAC error");
 889
 890         hex[32] = 0;
 891         for (i = 0; i < 16; i++) {
 892                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 893                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 894         }
 895
 896         /* response: "<user> <digest in hex>" */
 897         response = xstrfmt("%s %s", user, hex);
 898         resp_len = strlen(response);
 899
 900         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 901         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 902                                       (unsigned char *)response, resp_len);
 903         if (encoded_len < 0)
 904                 die("EVP_EncodeBlock error");
 905         return (char *)response_64;
 906 }
 907
 908 #else
 909
 910 static char *cram(const char *challenge_64, const char *user, const char *pass)
 911 {
 912         die("If you want to use CRAM-MD5 authenticate method, "
 913             "you have to build git-imap-send with OpenSSL library.");
 914 }
 915
 916 #endif
 917
 918 static int auth_cram_md5(struct imap_store *ctx, struct imap_cmd *cmd, const char *prompt)
 919 {
 920         int ret;
 921         char *response;
 922
 923         response = cram(prompt, server.user, server.pass);
 924
 925         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 926         if (ret != strlen(response))
 927                 return error("IMAP error: sending response failed");
 928
 929         free(response);
 930
 931         return 0;
 932 }
 933
 934 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 935 {
 936         if (srvc->user && srvc->pass)
 937                 return;
 938
 939         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 940         cred->host = xstrdup(srvc->host);
 941
 942         cred->username = xstrdup_or_null(srvc->user);
 943         cred->password = xstrdup_or_null(srvc->pass);
 944
 945         credential_fill(cred);
 946
 947         if (!srvc->user)
 948                 srvc->user = xstrdup(cred->username);
 949         if (!srvc->pass)
 950                 srvc->pass = xstrdup(cred->password);
 951 }
 952
 953 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
 954 {
 955         struct credential cred = CREDENTIAL_INIT;
 956         struct imap_store *ctx;
 957         struct imap *imap;
 958         char *arg, *rsp;
 959         int s = -1, preauth;
 960
 961         CALLOC_ARRAY(ctx, 1);
 962
 963         ctx->imap = CALLOC_ARRAY(imap, 1);
 964         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 965         imap->in_progress_append = &imap->in_progress;
 966
 967         /* open connection to IMAP server */
 968
 969         if (srvc->tunnel) {
 970                 struct child_process tunnel = CHILD_PROCESS_INIT;
 971
 972                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 973
 974                 strvec_push(&tunnel.args, srvc->tunnel);
 975                 tunnel.use_shell = 1;
 976                 tunnel.in = -1;
 977                 tunnel.out = -1;
 978                 if (start_command(&tunnel))
 979                         die("cannot start proxy %s", srvc->tunnel);
 980
 981                 imap->buf.sock.fd[0] = tunnel.out;
 982                 imap->buf.sock.fd[1] = tunnel.in;
 983
 984                 imap_info("ok\n");
 985         } else {
 986 #ifndef NO_IPV6
 987                 struct addrinfo hints, *ai0, *ai;
 988                 int gai;
 989                 char portstr[6];
 990
 991                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 992
 993                 memset(&hints, 0, sizeof(hints));
 994                 hints.ai_socktype = SOCK_STREAM;
 995                 hints.ai_protocol = IPPROTO_TCP;
 996
 997                 imap_info("Resolving %s... ", srvc->host);
 998                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 999                 if (gai) {
1000                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
1001                         goto bail;
1002                 }
1003                 imap_info("ok\n");
1004
1005                 for (ai0 = ai; ai; ai = ai->ai_next) {
1006                         char addr[NI_MAXHOST];
1007
1008                         s = socket(ai->ai_family, ai->ai_socktype,
1009                                    ai->ai_protocol);
1010                         if (s < 0)
1011                                 continue;
1012
1013                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1014                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
1015                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
1016
1017                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1018                                 close(s);
1019                                 s = -1;
1020                                 perror("connect");
1021                                 continue;
1022                         }
1023
1024                         break;
1025                 }
1026                 freeaddrinfo(ai0);
1027 #else /* NO_IPV6 */
1028                 struct hostent *he;
1029                 struct sockaddr_in addr;
1030
1031                 memset(&addr, 0, sizeof(addr));
1032                 addr.sin_port = htons(srvc->port);
1033                 addr.sin_family = AF_INET;
1034
1035                 imap_info("Resolving %s... ", srvc->host);
1036                 he = gethostbyname(srvc->host);
1037                 if (!he) {
1038                         perror("gethostbyname");
1039                         goto bail;
1040                 }
1041                 imap_info("ok\n");
1042
1043                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1044
1045                 s = socket(PF_INET, SOCK_STREAM, 0);
1046
1047                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1048                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1049                         close(s);
1050                         s = -1;
1051                         perror("connect");
1052                 }
1053 #endif
1054                 if (s < 0) {
1055                         fputs("Error: unable to connect to server.\n", stderr);
1056                         goto bail;
1057                 }
1058
1059                 imap->buf.sock.fd[0] = s;
1060                 imap->buf.sock.fd[1] = dup(s);
1061
1062                 if (srvc->use_ssl &&
1063                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1064                         close(s);
1065                         goto bail;
1066                 }
1067                 imap_info("ok\n");
1068         }
1069
1070         /* read the greeting string */
1071         if (buffer_gets(&imap->buf, &rsp)) {
1072                 fprintf(stderr, "IMAP error: no greeting response\n");
1073                 goto bail;
1074         }
1075         arg = next_arg(&rsp);
1076         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1077                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1078                 goto bail;
1079         }
1080         preauth = 0;
1081         if (!strcmp("PREAUTH", arg))
1082                 preauth = 1;
1083         else if (strcmp("OK", arg) != 0) {
1084                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1085                 goto bail;
1086         }
1087         parse_response_code(ctx, NULL, rsp);
1088         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1089                 goto bail;
1090
1091         if (!preauth) {
1092 #ifndef NO_OPENSSL
1093                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1094                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1095                                 goto bail;
1096                         if (ssl_socket_connect(&imap->buf.sock, 1,
1097                                                srvc->ssl_verify))
1098                                 goto bail;
1099                         /* capabilities may have changed, so get the new capabilities */
1100                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1101                                 goto bail;
1102                 }
1103 #endif
1104                 imap_info("Logging in...\n");
1105                 server_fill_credential(srvc, &cred);
1106
1107                 if (srvc->auth_method) {
1108                         struct imap_cmd_cb cb;
1109
1110                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1111                                 if (!CAP(AUTH_CRAM_MD5)) {
1112                                         fprintf(stderr, "You specified "
1113                                                 "CRAM-MD5 as authentication method, "
1114                                                 "but %s doesn't support it.\n", srvc->host);
1115                                         goto bail;
1116                                 }
1117                                 /* CRAM-MD5 */
1118
1119                                 memset(&cb, 0, sizeof(cb));
1120                                 cb.cont = auth_cram_md5;
1121                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1122                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1123                                         goto bail;
1124                                 }
1125                         } else {
1126                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1127                                 goto bail;
1128                         }
1129                 } else {
1130                         if (CAP(NOLOGIN)) {
1131                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1132                                         srvc->user, srvc->host);
1133                                 goto bail;
1134                         }
1135                         if (!imap->buf.sock.ssl)
1136                                 imap_warn("*** IMAP Warning *** Password is being "
1137                                           "sent in the clear\n");
1138                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1139                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1140                                 goto bail;
1141                         }
1142                 }
1143         } /* !preauth */
1144
1145         if (cred.username)
1146                 credential_approve(&cred);
1147         credential_clear(&cred);
1148
1149         /* check the target mailbox exists */
1150         ctx->name = folder;
1151         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1152         case RESP_OK:
1153                 /* ok */
1154                 break;
1155         case RESP_BAD:
1156                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1157                 goto out;
1158         case RESP_NO:
1159                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1160                         imap_info("Created missing mailbox\n");
1161                 } else {
1162                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1163                         goto out;
1164                 }
1165                 break;
1166         }
1167
1168         ctx->prefix = "";
1169         return ctx;
1170
1171 bail:
1172         if (cred.username)
1173                 credential_reject(&cred);
1174         credential_clear(&cred);
1175
1176  out:
1177         imap_close_store(ctx);
1178         return NULL;
1179 }
1180
1181 /*
1182  * Insert CR characters as necessary in *msg to ensure that every LF
1183  * character in *msg is preceded by a CR.
1184  */
1185 static void lf_to_crlf(struct strbuf *msg)
1186 {
1187         char *new_msg;
1188         size_t i, j;
1189         char lastc;
1190
1191         /* First pass: tally, in j, the size of the new_msg string: */
1192         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1193                 if (msg->buf[i] == '\n' && lastc != '\r')
1194                         j++; /* a CR will need to be added here */
1195                 lastc = msg->buf[i];
1196                 j++;
1197         }
1198
1199         new_msg = xmallocz(j);
1200
1201         /*
1202          * Second pass: write the new_msg string.  Note that this loop is
1203          * otherwise identical to the first pass.
1204          */
1205         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1206                 if (msg->buf[i] == '\n' && lastc != '\r')
1207                         new_msg[j++] = '\r';
1208                 lastc = new_msg[j++] = msg->buf[i];
1209         }
1210         strbuf_attach(msg, new_msg, j, j + 1);
1211 }
1212
1213 /*
1214  * Store msg to IMAP.  Also detach and free the data from msg->data,
1215  * leaving msg->data empty.
1216  */
1217 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1218 {
1219         struct imap *imap = ctx->imap;
1220         struct imap_cmd_cb cb;
1221         const char *prefix, *box;
1222         int ret;
1223
1224         lf_to_crlf(msg);
1225         memset(&cb, 0, sizeof(cb));
1226
1227         cb.dlen = msg->len;
1228         cb.data = strbuf_detach(msg, NULL);
1229
1230         box = ctx->name;
1231         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1232         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1233         imap->caps = imap->rcaps;
1234         if (ret != DRV_OK)
1235                 return ret;
1236
1237         return DRV_OK;
1238 }
1239
1240 static void wrap_in_html(struct strbuf *msg)
1241 {
1242         struct strbuf buf = STRBUF_INIT;
1243         static char *content_type = "Content-Type: text/html;\n";
1244         static char *pre_open = "<pre>\n";
1245         static char *pre_close = "</pre>\n";
1246         const char *body = strstr(msg->buf, "\n\n");
1247
1248         if (!body)
1249                 return; /* Headers but no body; no wrapping needed */
1250
1251         body += 2;
1252
1253         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1254         strbuf_addstr(&buf, content_type);
1255         strbuf_addch(&buf, '\n');
1256         strbuf_addstr(&buf, pre_open);
1257         strbuf_addstr_xml_quoted(&buf, body);
1258         strbuf_addstr(&buf, pre_close);
1259
1260         strbuf_release(msg);
1261         *msg = buf;
1262 }
1263
1264 static int count_messages(struct strbuf *all_msgs)
1265 {
1266         int count = 0;
1267         char *p = all_msgs->buf;
1268
1269         while (1) {
1270                 if (starts_with(p, "From ")) {
1271                         p = strstr(p+5, "\nFrom: ");
1272                         if (!p) break;
1273                         p = strstr(p+7, "\nDate: ");
1274                         if (!p) break;
1275                         p = strstr(p+7, "\nSubject: ");
1276                         if (!p) break;
1277                         p += 10;
1278                         count++;
1279                 }
1280                 p = strstr(p+5, "\nFrom ");
1281                 if (!p)
1282                         break;
1283                 p++;
1284         }
1285         return count;
1286 }
1287
1288 /*
1289  * Copy the next message from all_msgs, starting at offset *ofs, to
1290  * msg.  Update *ofs to the start of the following message.  Return
1291  * true iff a message was successfully copied.
1292  */
1293 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1294 {
1295         char *p, *data;
1296         size_t len;
1297
1298         if (*ofs >= all_msgs->len)
1299                 return 0;
1300
1301         data = &all_msgs->buf[*ofs];
1302         len = all_msgs->len - *ofs;
1303
1304         if (len < 5 || !starts_with(data, "From "))
1305                 return 0;
1306
1307         p = strchr(data, '\n');
1308         if (p) {
1309                 p++;
1310                 len -= p - data;
1311                 *ofs += p - data;
1312                 data = p;
1313         }
1314
1315         p = strstr(data, "\nFrom ");
1316         if (p)
1317                 len = &p[1] - data;
1318
1319         strbuf_add(msg, data, len);
1320         *ofs += len;
1321         return 1;
1322 }
1323
1324 static int git_imap_config(const char *var, const char *val, void *cb)
1325 {
1326
1327         if (!strcmp("imap.sslverify", var))
1328                 server.ssl_verify = git_config_bool(var, val);
1329         else if (!strcmp("imap.preformattedhtml", var))
1330                 server.use_html = git_config_bool(var, val);
1331         else if (!strcmp("imap.folder", var))
1332                 return git_config_string(&server.folder, var, val);
1333         else if (!strcmp("imap.user", var))
1334                 return git_config_string(&server.user, var, val);
1335         else if (!strcmp("imap.pass", var))
1336                 return git_config_string(&server.pass, var, val);
1337         else if (!strcmp("imap.tunnel", var))
1338                 return git_config_string(&server.tunnel, var, val);
1339         else if (!strcmp("imap.authmethod", var))
1340                 return git_config_string(&server.auth_method, var, val);
1341         else if (!strcmp("imap.port", var))
1342                 server.port = git_config_int(var, val);
1343         else if (!strcmp("imap.host", var)) {
1344                 if (!val) {
1345                         git_die_config("imap.host", "Missing value for 'imap.host'");
1346                 } else {
1347                         if (starts_with(val, "imap:"))
1348                                 val += 5;
1349                         else if (starts_with(val, "imaps:")) {
1350                                 val += 6;
1351                                 server.use_ssl = 1;
1352                         }
1353                         if (starts_with(val, "//"))
1354                                 val += 2;
1355                         server.host = xstrdup(val);
1356                 }
1357         } else
1358                 return git_default_config(var, val, cb);
1359
1360         return 0;
1361 }
1362
1363 static int append_msgs_to_imap(struct imap_server_conf *server,
1364                                struct strbuf* all_msgs, int total)
1365 {
1366         struct strbuf msg = STRBUF_INIT;
1367         struct imap_store *ctx = NULL;
1368         int ofs = 0;
1369         int r;
1370         int n = 0;
1371
1372         ctx = imap_open_store(server, server->folder);
1373         if (!ctx) {
1374                 fprintf(stderr, "failed to open store\n");
1375                 return 1;
1376         }
1377         ctx->name = server->folder;
1378
1379         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1380         while (1) {
1381                 unsigned percent = n * 100 / total;
1382
1383                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1384
1385                 if (!split_msg(all_msgs, &msg, &ofs))
1386                         break;
1387                 if (server->use_html)
1388                         wrap_in_html(&msg);
1389                 r = imap_store_msg(ctx, &msg);
1390                 if (r != DRV_OK)
1391                         break;
1392                 n++;
1393         }
1394         fprintf(stderr, "\n");
1395
1396         imap_close_store(ctx);
1397
1398         return 0;
1399 }
1400
1401 #ifdef USE_CURL_FOR_IMAP_SEND
1402 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1403 {
1404         CURL *curl;
1405         struct strbuf path = STRBUF_INIT;
1406         char *uri_encoded_folder;
1407
1408         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1409                 die("curl_global_init failed");
1410
1411         curl = curl_easy_init();
1412
1413         if (!curl)
1414                 die("curl_easy_init failed");
1415
1416         server_fill_credential(&server, cred);
1417         curl_easy_setopt(curl, CURLOPT_USERNAME, server.user);
1418         curl_easy_setopt(curl, CURLOPT_PASSWORD, server.pass);
1419
1420         strbuf_addstr(&path, server.use_ssl ? "imaps://" : "imap://");
1421         strbuf_addstr(&path, server.host);
1422         if (!path.len || path.buf[path.len - 1] != '/')
1423                 strbuf_addch(&path, '/');
1424
1425         uri_encoded_folder = curl_easy_escape(curl, server.folder, 0);
1426         if (!uri_encoded_folder)
1427                 die("failed to encode server folder");
1428         strbuf_addstr(&path, uri_encoded_folder);
1429         curl_free(uri_encoded_folder);
1430
1431         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1432         strbuf_release(&path);
1433         curl_easy_setopt(curl, CURLOPT_PORT, server.port);
1434
1435         if (server.auth_method) {
1436 #ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
1437                 warning("No LOGIN_OPTIONS support in this cURL version");
1438 #else
1439                 struct strbuf auth = STRBUF_INIT;
1440                 strbuf_addstr(&auth, "AUTH=");
1441                 strbuf_addstr(&auth, server.auth_method);
1442                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1443                 strbuf_release(&auth);
1444 #endif
1445         }
1446
1447         if (!server.use_ssl)
1448                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1449
1450         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, server.ssl_verify);
1451         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, server.ssl_verify);
1452
1453         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1454
1455         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1456
1457         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1458                 http_trace_curl_no_data();
1459         setup_curl_trace(curl);
1460
1461         return curl;
1462 }
1463
1464 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1465                                     struct strbuf* all_msgs, int total)
1466 {
1467         int ofs = 0;
1468         int n = 0;
1469         struct buffer msgbuf = { STRBUF_INIT, 0 };
1470         CURL *curl;
1471         CURLcode res = CURLE_OK;
1472         struct credential cred = CREDENTIAL_INIT;
1473
1474         curl = setup_curl(server, &cred);
1475         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1476
1477         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1478         while (1) {
1479                 unsigned percent = n * 100 / total;
1480                 int prev_len;
1481
1482                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1483
1484                 prev_len = msgbuf.buf.len;
1485                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1486                         break;
1487                 if (server->use_html)
1488                         wrap_in_html(&msgbuf.buf);
1489                 lf_to_crlf(&msgbuf.buf);
1490
1491                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1492                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1493
1494                 res = curl_easy_perform(curl);
1495
1496                 if(res != CURLE_OK) {
1497                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1498                                         curl_easy_strerror(res));
1499                         break;
1500                 }
1501
1502                 n++;
1503         }
1504         fprintf(stderr, "\n");
1505
1506         curl_easy_cleanup(curl);
1507         curl_global_cleanup();
1508
1509         if (cred.username) {
1510                 if (res == CURLE_OK)
1511                         credential_approve(&cred);
1512                 else if (res == CURLE_LOGIN_DENIED)
1513                         credential_reject(&cred);
1514         }
1515
1516         credential_clear(&cred);
1517
1518         return res != CURLE_OK;
1519 }
1520 #endif
1521
1522 int cmd_main(int argc, const char **argv)
1523 {
1524         struct strbuf all_msgs = STRBUF_INIT;
1525         int total;
1526         int nongit_ok;
1527
1528         setup_git_directory_gently(&nongit_ok);
1529         git_config(git_imap_config, NULL);
1530
1531         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1532
1533         if (argc)
1534                 usage_with_options(imap_send_usage, imap_send_options);
1535
1536 #ifndef USE_CURL_FOR_IMAP_SEND
1537         if (use_curl) {
1538                 warning("--curl not supported in this build");
1539                 use_curl = 0;
1540         }
1541 #elif defined(NO_OPENSSL)
1542         if (!use_curl) {
1543                 warning("--no-curl not supported in this build");
1544                 use_curl = 1;
1545         }
1546 #endif
1547
1548         if (!server.port)
1549                 server.port = server.use_ssl ? 993 : 143;
1550
1551         if (!server.folder) {
1552                 fprintf(stderr, "no imap store specified\n");
1553                 return 1;
1554         }
1555         if (!server.host) {
1556                 if (!server.tunnel) {
1557                         fprintf(stderr, "no imap host specified\n");
1558                         return 1;
1559                 }
1560                 server.host = "tunnel";
1561         }
1562
1563         /* read the messages */
1564         if (strbuf_read(&all_msgs, 0, 0) < 0) {
1565                 error_errno(_("could not read from stdin"));
1566                 return 1;
1567         }
1568
1569         if (all_msgs.len == 0) {
1570                 fprintf(stderr, "nothing to send\n");
1571                 return 1;
1572         }
1573
1574         total = count_messages(&all_msgs);
1575         if (!total) {
1576                 fprintf(stderr, "no messages to send\n");
1577                 return 1;
1578         }
1579
1580         /* write it to the imap server */
1581
1582         if (server.tunnel)
1583                 return append_msgs_to_imap(&server, &all_msgs, total);
1584
1585 #ifdef USE_CURL_FOR_IMAP_SEND
1586         if (use_curl)
1587                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1588 #endif
1589
1590         return append_msgs_to_imap(&server, &all_msgs, total);
1591 }