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 <https://www.gnu.org/licenses/>.
  22  */
  23
  24 #define USE_THE_REPOSITORY_VARIABLE
  25
  26 #include "git-compat-util.h"
  27 #include "config.h"
  28 #include "credential.h"
  29 #include "gettext.h"
  30 #include "run-command.h"
  31 #include "parse-options.h"
  32 #include "setup.h"
  33 #include "strbuf.h"
  34 #ifdef USE_CURL_FOR_IMAP_SEND
  35 #include "http.h"
  36 #endif
  37
  38 #if defined(USE_CURL_FOR_IMAP_SEND)
  39 /* Always default to curl if it's available. */
  40 #define USE_CURL_DEFAULT 1
  41 #else
  42 /* We don't have curl, so continue to use the historical implementation */
  43 #define USE_CURL_DEFAULT 0
  44 #endif
  45
  46 static int verbosity;
  47 static int use_curl = USE_CURL_DEFAULT;
  48
  49 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
  50
  51 static struct option imap_send_options[] = {
  52         OPT__VERBOSITY(&verbosity),
  53         OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
  54         OPT_END()
  55 };
  56
  57 #undef DRV_OK
  58 #define DRV_OK          0
  59 #define DRV_MSG_BAD     -1
  60 #define DRV_BOX_BAD     -2
  61 #define DRV_STORE_BAD   -3
  62
  63 __attribute__((format (printf, 1, 2)))
  64 static void imap_info(const char *, ...);
  65 __attribute__((format (printf, 1, 2)))
  66 static void imap_warn(const char *, ...);
  67
  68 static char *next_arg(char **);
  69
  70 struct imap_server_conf {
  71         char *tunnel;
  72         char *host;
  73         int port;
  74         char *folder;
  75         char *user;
  76         char *pass;
  77         int use_ssl;
  78         int ssl_verify;
  79         int use_html;
  80         char *auth_method;
  81 };
  82
  83 struct imap_socket {
  84         int fd[2];
  85 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
  86         void *ssl;
  87 #else
  88         SSL *ssl;
  89 #endif
  90 };
  91
  92 struct imap_buffer {
  93         struct imap_socket sock;
  94         int bytes;
  95         int offset;
  96         char buf[1024];
  97 };
  98
  99 struct imap_cmd;
 100
 101 struct imap {
 102         int uidnext; /* from SELECT responses */
 103         unsigned caps, rcaps; /* CAPABILITY results */
 104         /* command queue */
 105         int nexttag, num_in_progress, literal_pending;
 106         struct imap_cmd *in_progress, **in_progress_append;
 107         struct imap_buffer buf; /* this is BIG, so put it last */
 108 };
 109
 110 struct imap_store {
 111         const struct imap_server_conf *cfg;
 112         /* currently open mailbox */
 113         const char *name; /* foreign! maybe preset? */
 114         int uidvalidity;
 115         struct imap *imap;
 116         const char *prefix;
 117 };
 118
 119 struct imap_cmd_cb {
 120         int (*cont)(struct imap_store *ctx, const char *prompt);
 121         void *ctx;
 122         char *data;
 123         int dlen;
 124 };
 125
 126 struct imap_cmd {
 127         struct imap_cmd *next;
 128         struct imap_cmd_cb cb;
 129         char *cmd;
 130         int tag;
 131 };
 132
 133 #define CAP(cap) (imap->caps & (1 << (cap)))
 134
 135 enum CAPABILITY {
 136         NOLOGIN = 0,
 137         UIDPLUS,
 138         LITERALPLUS,
 139         NAMESPACE,
 140         STARTTLS,
 141         AUTH_CRAM_MD5
 142 };
 143
 144 static const char *cap_list[] = {
 145         "LOGINDISABLED",
 146         "UIDPLUS",
 147         "LITERAL+",
 148         "NAMESPACE",
 149         "STARTTLS",
 150         "AUTH=CRAM-MD5",
 151 };
 152
 153 #define RESP_OK    0
 154 #define RESP_NO    1
 155 #define RESP_BAD   2
 156
 157 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 158
 159
 160 #ifndef NO_OPENSSL
 161 static void ssl_socket_perror(const char *func)
 162 {
 163         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 164 }
 165 #endif
 166
 167 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 168 {
 169 #ifndef NO_OPENSSL
 170         if (sock->ssl) {
 171                 int sslerr = SSL_get_error(sock->ssl, ret);
 172                 switch (sslerr) {
 173                 case SSL_ERROR_NONE:
 174                         break;
 175                 case SSL_ERROR_SYSCALL:
 176                         perror("SSL_connect");
 177                         break;
 178                 default:
 179                         ssl_socket_perror("SSL_connect");
 180                         break;
 181                 }
 182         } else
 183 #endif
 184         {
 185                 if (ret < 0)
 186                         perror(func);
 187                 else
 188                         fprintf(stderr, "%s: unexpected EOF\n", func);
 189         }
 190         /* mark as used to appease -Wunused-parameter with NO_OPENSSL */
 191         (void)sock;
 192 }
 193
 194 #ifdef NO_OPENSSL
 195 static int ssl_socket_connect(struct imap_socket *sock UNUSED,
 196                               const struct imap_server_conf *cfg UNUSED,
 197                               int use_tls_only UNUSED)
 198 {
 199         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 200         return -1;
 201 }
 202
 203 #else
 204
 205 static int host_matches(const char *host, const char *pattern)
 206 {
 207         if (pattern[0] == '*' && pattern[1] == '.') {
 208                 pattern += 2;
 209                 if (!(host = strchr(host, '.')))
 210                         return 0;
 211                 host++;
 212         }
 213
 214         return *host && *pattern && !strcasecmp(host, pattern);
 215 }
 216
 217 static int verify_hostname(X509 *cert, const char *hostname)
 218 {
 219         int len;
 220         X509_NAME *subj;
 221         char cname[1000];
 222         int i, found;
 223         STACK_OF(GENERAL_NAME) *subj_alt_names;
 224
 225         /* try the DNS subjectAltNames */
 226         found = 0;
 227         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
 228                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
 229                 for (i = 0; !found && i < num_subj_alt_names; i++) {
 230                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 231                         if (subj_alt_name->type == GEN_DNS &&
 232                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
 233                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
 234                                 found = 1;
 235                 }
 236                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
 237         }
 238         if (found)
 239                 return 0;
 240
 241         /* try the common name */
 242         if (!(subj = X509_get_subject_name(cert)))
 243                 return error("cannot get certificate subject");
 244         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
 245                 return error("cannot get certificate common name");
 246         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
 247                 return 0;
 248         return error("certificate owner '%s' does not match hostname '%s'",
 249                      cname, hostname);
 250 }
 251
 252 static int ssl_socket_connect(struct imap_socket *sock,
 253                               const struct imap_server_conf *cfg,
 254                               int use_tls_only)
 255 {
 256 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 257         const SSL_METHOD *meth;
 258 #else
 259         SSL_METHOD *meth;
 260 #endif
 261         SSL_CTX *ctx;
 262         int ret;
 263         X509 *cert;
 264
 265         SSL_library_init();
 266         SSL_load_error_strings();
 267
 268         meth = SSLv23_method();
 269         if (!meth) {
 270                 ssl_socket_perror("SSLv23_method");
 271                 return -1;
 272         }
 273
 274         ctx = SSL_CTX_new(meth);
 275         if (!ctx) {
 276                 ssl_socket_perror("SSL_CTX_new");
 277                 return -1;
 278         }
 279
 280         if (use_tls_only)
 281                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 282
 283         if (cfg->ssl_verify)
 284                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 285
 286         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 287                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 288                 return -1;
 289         }
 290         sock->ssl = SSL_new(ctx);
 291         if (!sock->ssl) {
 292                 ssl_socket_perror("SSL_new");
 293                 return -1;
 294         }
 295         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 296                 ssl_socket_perror("SSL_set_rfd");
 297                 return -1;
 298         }
 299         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 300                 ssl_socket_perror("SSL_set_wfd");
 301                 return -1;
 302         }
 303
 304 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 305         /*
 306          * SNI (RFC4366)
 307          * OpenSSL does not document this function, but the implementation
 308          * returns 1 on success, 0 on failure after calling SSLerr().
 309          */
 310         ret = SSL_set_tlsext_host_name(sock->ssl, cfg->host);
 311         if (ret != 1)
 312                 warning("SSL_set_tlsext_host_name(%s) failed.", cfg->host);
 313 #endif
 314
 315         ret = SSL_connect(sock->ssl);
 316         if (ret <= 0) {
 317                 socket_perror("SSL_connect", sock, ret);
 318                 return -1;
 319         }
 320
 321         if (cfg->ssl_verify) {
 322                 /* make sure the hostname matches that of the certificate */
 323                 cert = SSL_get_peer_certificate(sock->ssl);
 324                 if (!cert)
 325                         return error("unable to get peer certificate.");
 326                 if (verify_hostname(cert, cfg->host) < 0)
 327                         return -1;
 328         }
 329
 330         return 0;
 331 }
 332 #endif
 333
 334 static int socket_read(struct imap_socket *sock, char *buf, int len)
 335 {
 336         ssize_t n;
 337 #ifndef NO_OPENSSL
 338         if (sock->ssl)
 339                 n = SSL_read(sock->ssl, buf, len);
 340         else
 341 #endif
 342                 n = xread(sock->fd[0], buf, len);
 343         if (n <= 0) {
 344                 socket_perror("read", sock, n);
 345                 close(sock->fd[0]);
 346                 close(sock->fd[1]);
 347                 sock->fd[0] = sock->fd[1] = -1;
 348         }
 349         return n;
 350 }
 351
 352 static int socket_write(struct imap_socket *sock, const char *buf, int len)
 353 {
 354         int n;
 355 #ifndef NO_OPENSSL
 356         if (sock->ssl)
 357                 n = SSL_write(sock->ssl, buf, len);
 358         else
 359 #endif
 360                 n = write_in_full(sock->fd[1], buf, len);
 361         if (n != len) {
 362                 socket_perror("write", sock, n);
 363                 close(sock->fd[0]);
 364                 close(sock->fd[1]);
 365                 sock->fd[0] = sock->fd[1] = -1;
 366         }
 367         return n;
 368 }
 369
 370 static void socket_shutdown(struct imap_socket *sock)
 371 {
 372 #ifndef NO_OPENSSL
 373         if (sock->ssl) {
 374                 SSL_shutdown(sock->ssl);
 375                 SSL_free(sock->ssl);
 376         }
 377 #endif
 378         close(sock->fd[0]);
 379         close(sock->fd[1]);
 380 }
 381
 382 /* simple line buffering */
 383 static int buffer_gets(struct imap_buffer *b, char **s)
 384 {
 385         int n;
 386         int start = b->offset;
 387
 388         *s = b->buf + start;
 389
 390         for (;;) {
 391                 /* make sure we have enough data to read the \r\n sequence */
 392                 if (b->offset + 1 >= b->bytes) {
 393                         if (start) {
 394                                 /* shift down used bytes */
 395                                 *s = b->buf;
 396
 397                                 assert(start <= b->bytes);
 398                                 n = b->bytes - start;
 399
 400                                 if (n)
 401                                         memmove(b->buf, b->buf + start, n);
 402                                 b->offset -= start;
 403                                 b->bytes = n;
 404                                 start = 0;
 405                         }
 406
 407                         n = socket_read(&b->sock, b->buf + b->bytes,
 408                                          sizeof(b->buf) - b->bytes);
 409
 410                         if (n <= 0)
 411                                 return -1;
 412
 413                         b->bytes += n;
 414                 }
 415
 416                 if (b->buf[b->offset] == '\r') {
 417                         assert(b->offset + 1 < b->bytes);
 418                         if (b->buf[b->offset + 1] == '\n') {
 419                                 b->buf[b->offset] = 0;  /* terminate the string */
 420                                 b->offset += 2; /* next line */
 421                                 if (0 < verbosity)
 422                                         puts(*s);
 423                                 return 0;
 424                         }
 425                 }
 426
 427                 b->offset++;
 428         }
 429         /* not reached */
 430 }
 431
 432 __attribute__((format (printf, 1, 2)))
 433 static void imap_info(const char *msg, ...)
 434 {
 435         va_list va;
 436
 437         if (0 <= verbosity) {
 438                 va_start(va, msg);
 439                 vprintf(msg, va);
 440                 va_end(va);
 441                 fflush(stdout);
 442         }
 443 }
 444
 445 __attribute__((format (printf, 1, 2)))
 446 static void imap_warn(const char *msg, ...)
 447 {
 448         va_list va;
 449
 450         if (-2 < verbosity) {
 451                 va_start(va, msg);
 452                 vfprintf(stderr, msg, va);
 453                 va_end(va);
 454         }
 455 }
 456
 457 static char *next_arg(char **s)
 458 {
 459         char *ret;
 460
 461         if (!s || !*s)
 462                 return NULL;
 463         while (isspace((unsigned char) **s))
 464                 (*s)++;
 465         if (!**s) {
 466                 *s = NULL;
 467                 return NULL;
 468         }
 469         if (**s == '"') {
 470                 ++*s;
 471                 ret = *s;
 472                 *s = strchr(*s, '"');
 473         } else {
 474                 ret = *s;
 475                 while (**s && !isspace((unsigned char) **s))
 476                         (*s)++;
 477         }
 478         if (*s) {
 479                 if (**s)
 480                         *(*s)++ = 0;
 481                 if (!**s)
 482                         *s = NULL;
 483         }
 484         return ret;
 485 }
 486
 487 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 488                                        struct imap_cmd_cb *cb,
 489                                        const char *fmt, va_list ap)
 490 {
 491         struct imap *imap = ctx->imap;
 492         struct imap_cmd *cmd;
 493         int n;
 494         struct strbuf buf = STRBUF_INIT;
 495
 496         cmd = xmalloc(sizeof(struct imap_cmd));
 497         cmd->cmd = xstrvfmt(fmt, ap);
 498         cmd->tag = ++imap->nexttag;
 499
 500         if (cb)
 501                 cmd->cb = *cb;
 502         else
 503                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 504
 505         while (imap->literal_pending)
 506                 get_cmd_result(ctx, NULL);
 507
 508         if (!cmd->cb.data)
 509                 strbuf_addf(&buf, "%d %s\r\n", cmd->tag, cmd->cmd);
 510         else
 511                 strbuf_addf(&buf, "%d %s{%d%s}\r\n", cmd->tag, cmd->cmd,
 512                             cmd->cb.dlen, CAP(LITERALPLUS) ? "+" : "");
 513         if (buf.len > INT_MAX)
 514                 die("imap command overflow!");
 515
 516         if (0 < verbosity) {
 517                 if (imap->num_in_progress)
 518                         printf("(%d in progress) ", imap->num_in_progress);
 519                 if (!starts_with(cmd->cmd, "LOGIN"))
 520                         printf(">>> %s", buf.buf);
 521                 else
 522                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 523         }
 524         if (socket_write(&imap->buf.sock, buf.buf, buf.len) != buf.len) {
 525                 free(cmd->cmd);
 526                 free(cmd);
 527                 if (cb)
 528                         free(cb->data);
 529                 strbuf_release(&buf);
 530                 return NULL;
 531         }
 532         strbuf_release(&buf);
 533         if (cmd->cb.data) {
 534                 if (CAP(LITERALPLUS)) {
 535                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 536                         free(cmd->cb.data);
 537                         if (n != cmd->cb.dlen ||
 538                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 539                                 free(cmd->cmd);
 540                                 free(cmd);
 541                                 return NULL;
 542                         }
 543                         cmd->cb.data = NULL;
 544                 } else
 545                         imap->literal_pending = 1;
 546         } else if (cmd->cb.cont)
 547                 imap->literal_pending = 1;
 548         cmd->next = NULL;
 549         *imap->in_progress_append = cmd;
 550         imap->in_progress_append = &cmd->next;
 551         imap->num_in_progress++;
 552         return cmd;
 553 }
 554
 555 __attribute__((format (printf, 3, 4)))
 556 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 557                      const char *fmt, ...)
 558 {
 559         va_list ap;
 560         struct imap_cmd *cmdp;
 561
 562         va_start(ap, fmt);
 563         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 564         va_end(ap);
 565         if (!cmdp)
 566                 return RESP_BAD;
 567
 568         return get_cmd_result(ctx, cmdp);
 569 }
 570
 571 __attribute__((format (printf, 3, 4)))
 572 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 573                        const char *fmt, ...)
 574 {
 575         va_list ap;
 576         struct imap_cmd *cmdp;
 577
 578         va_start(ap, fmt);
 579         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 580         va_end(ap);
 581         if (!cmdp)
 582                 return DRV_STORE_BAD;
 583
 584         switch (get_cmd_result(ctx, cmdp)) {
 585         case RESP_BAD: return DRV_STORE_BAD;
 586         case RESP_NO: return DRV_MSG_BAD;
 587         default: return DRV_OK;
 588         }
 589 }
 590
 591 static int skip_imap_list_l(char **sp, int level)
 592 {
 593         char *s = *sp;
 594
 595         for (;;) {
 596                 while (isspace((unsigned char)*s))
 597                         s++;
 598                 if (level && *s == ')') {
 599                         s++;
 600                         break;
 601                 }
 602                 if (*s == '(') {
 603                         /* sublist */
 604                         s++;
 605                         if (skip_imap_list_l(&s, level + 1))
 606                                 goto bail;
 607                 } else if (*s == '"') {
 608                         /* quoted string */
 609                         s++;
 610                         for (; *s != '"'; s++)
 611                                 if (!*s)
 612                                         goto bail;
 613                         s++;
 614                 } else {
 615                         /* atom */
 616                         for (; *s && !isspace((unsigned char)*s); s++)
 617                                 if (level && *s == ')')
 618                                         break;
 619                 }
 620
 621                 if (!level)
 622                         break;
 623                 if (!*s)
 624                         goto bail;
 625         }
 626         *sp = s;
 627         return 0;
 628
 629 bail:
 630         return -1;
 631 }
 632
 633 static void skip_list(char **sp)
 634 {
 635         skip_imap_list_l(sp, 0);
 636 }
 637
 638 static void parse_capability(struct imap *imap, char *cmd)
 639 {
 640         char *arg;
 641         unsigned i;
 642
 643         imap->caps = 0x80000000;
 644         while ((arg = next_arg(&cmd)))
 645                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 646                         if (!strcmp(cap_list[i], arg))
 647                                 imap->caps |= 1 << i;
 648         imap->rcaps = imap->caps;
 649 }
 650
 651 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 652                                char *s)
 653 {
 654         struct imap *imap = ctx->imap;
 655         char *arg, *p;
 656
 657         if (!s || *s != '[')
 658                 return RESP_OK;         /* no response code */
 659         s++;
 660         if (!(p = strchr(s, ']'))) {
 661                 fprintf(stderr, "IMAP error: malformed response code\n");
 662                 return RESP_BAD;
 663         }
 664         *p++ = 0;
 665         arg = next_arg(&s);
 666         if (!arg) {
 667                 fprintf(stderr, "IMAP error: empty response code\n");
 668                 return RESP_BAD;
 669         }
 670         if (!strcmp("UIDVALIDITY", arg)) {
 671                 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &ctx->uidvalidity) || !ctx->uidvalidity) {
 672                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 673                         return RESP_BAD;
 674                 }
 675         } else if (!strcmp("UIDNEXT", arg)) {
 676                 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &imap->uidnext) || !imap->uidnext) {
 677                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 678                         return RESP_BAD;
 679                 }
 680         } else if (!strcmp("CAPABILITY", arg)) {
 681                 parse_capability(imap, s);
 682         } else if (!strcmp("ALERT", arg)) {
 683                 /* RFC2060 says that these messages MUST be displayed
 684                  * to the user
 685                  */
 686                 for (; isspace((unsigned char)*p); p++);
 687                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 688         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 689                 if (!(arg = next_arg(&s)) || strtol_i(arg, 10, &ctx->uidvalidity) || !ctx->uidvalidity ||
 690                     !(arg = next_arg(&s)) || strtol_i(arg, 10, (int *)cb->ctx) || !cb->ctx) {
 691                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 692                         return RESP_BAD;
 693                 }
 694         }
 695         return RESP_OK;
 696 }
 697
 698 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 699 {
 700         struct imap *imap = ctx->imap;
 701         struct imap_cmd *cmdp, **pcmdp;
 702         char *cmd;
 703         const char *arg, *arg1;
 704         int n, resp, resp2, tag;
 705
 706         for (;;) {
 707                 if (buffer_gets(&imap->buf, &cmd))
 708                         return RESP_BAD;
 709
 710                 arg = next_arg(&cmd);
 711                 if (!arg) {
 712                         fprintf(stderr, "IMAP error: empty response\n");
 713                         return RESP_BAD;
 714                 }
 715                 if (*arg == '*') {
 716                         arg = next_arg(&cmd);
 717                         if (!arg) {
 718                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 719                                 return RESP_BAD;
 720                         }
 721
 722                         if (!strcmp("NAMESPACE", arg)) {
 723                                 /* rfc2342 NAMESPACE response. */
 724                                 skip_list(&cmd); /* Personal mailboxes */
 725                                 skip_list(&cmd); /* Others' mailboxes */
 726                                 skip_list(&cmd); /* Shared mailboxes */
 727                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 728                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 729                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 730                                         return resp;
 731                         } else if (!strcmp("CAPABILITY", arg)) {
 732                                 parse_capability(imap, cmd);
 733                         } else if ((arg1 = next_arg(&cmd))) {
 734                                 ; /*
 735                                    * Unhandled response-data with at least two words.
 736                                    * Ignore it.
 737                                    *
 738                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 739                                    * and '<num> RECENT' but as a probably-unintended side
 740                                    * effect it ignores other unrecognized two-word
 741                                    * responses.  imap-send doesn't ever try to read
 742                                    * messages or mailboxes these days, so consider
 743                                    * eliminating this case.
 744                                    */
 745                         } else {
 746                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 747                                 return RESP_BAD;
 748                         }
 749                 } else if (!imap->in_progress) {
 750                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 751                         return RESP_BAD;
 752                 } else if (*arg == '+') {
 753                         /* This can happen only with the last command underway, as
 754                            it enforces a round-trip. */
 755                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 756                                offsetof(struct imap_cmd, next));
 757                         if (cmdp->cb.data) {
 758                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 759                                 FREE_AND_NULL(cmdp->cb.data);
 760                                 if (n != (int)cmdp->cb.dlen)
 761                                         return RESP_BAD;
 762                         } else if (cmdp->cb.cont) {
 763                                 if (cmdp->cb.cont(ctx, cmd))
 764                                         return RESP_BAD;
 765                         } else {
 766                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 767                                 return RESP_BAD;
 768                         }
 769                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 770                                 return RESP_BAD;
 771                         if (!cmdp->cb.cont)
 772                                 imap->literal_pending = 0;
 773                         if (!tcmd)
 774                                 return DRV_OK;
 775                 } else {
 776                         if (strtol_i(arg, 10, &tag)) {
 777                                 fprintf(stderr, "IMAP error: malformed tag %s\n", arg);
 778                                 return RESP_BAD;
 779                         }
 780                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 781                                 if (cmdp->tag == tag)
 782                                         goto gottag;
 783                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 784                         return RESP_BAD;
 785                 gottag:
 786                         if (!(*pcmdp = cmdp->next))
 787                                 imap->in_progress_append = pcmdp;
 788                         imap->num_in_progress--;
 789                         if (cmdp->cb.cont || cmdp->cb.data)
 790                                 imap->literal_pending = 0;
 791                         arg = next_arg(&cmd);
 792                         if (!arg)
 793                                 arg = "";
 794                         if (!strcmp("OK", arg))
 795                                 resp = DRV_OK;
 796                         else {
 797                                 if (!strcmp("NO", arg))
 798                                         resp = RESP_NO;
 799                                 else /*if (!strcmp("BAD", arg))*/
 800                                         resp = RESP_BAD;
 801                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 802                                         !starts_with(cmdp->cmd, "LOGIN") ?
 803                                                         cmdp->cmd : "LOGIN <user> <pass>",
 804                                                         arg, cmd ? cmd : "");
 805                         }
 806                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 807                                 resp = resp2;
 808                         free(cmdp->cb.data);
 809                         free(cmdp->cmd);
 810                         free(cmdp);
 811                         if (!tcmd || tcmd == cmdp)
 812                                 return resp;
 813                 }
 814         }
 815         /* not reached */
 816 }
 817
 818 static void imap_close_server(struct imap_store *ictx)
 819 {
 820         struct imap *imap = ictx->imap;
 821
 822         if (imap->buf.sock.fd[0] != -1) {
 823                 imap_exec(ictx, NULL, "LOGOUT");
 824                 socket_shutdown(&imap->buf.sock);
 825         }
 826         free(imap);
 827 }
 828
 829 static void imap_close_store(struct imap_store *ctx)
 830 {
 831         imap_close_server(ctx);
 832         free(ctx);
 833 }
 834
 835 #ifndef NO_OPENSSL
 836
 837 /*
 838  * hexchar() and cram() functions are based on the code from the isync
 839  * project (https://isync.sourceforge.io/).
 840  */
 841 static char hexchar(unsigned int b)
 842 {
 843         return b < 10 ? '0' + b : 'a' + (b - 10);
 844 }
 845
 846 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 847 static char *cram(const char *challenge_64, const char *user, const char *pass)
 848 {
 849         int i, resp_len, encoded_len, decoded_len;
 850         unsigned char hash[16];
 851         char hex[33];
 852         char *response, *response_64, *challenge;
 853
 854         /*
 855          * length of challenge_64 (i.e. base-64 encoded string) is a good
 856          * enough upper bound for challenge (decoded result).
 857          */
 858         encoded_len = strlen(challenge_64);
 859         challenge = xmalloc(encoded_len);
 860         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 861                                       (unsigned char *)challenge_64, encoded_len);
 862         if (decoded_len < 0)
 863                 die("invalid challenge %s", challenge_64);
 864         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 865                 die("HMAC error");
 866
 867         hex[32] = 0;
 868         for (i = 0; i < 16; i++) {
 869                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 870                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 871         }
 872
 873         /* response: "<user> <digest in hex>" */
 874         response = xstrfmt("%s %s", user, hex);
 875         resp_len = strlen(response);
 876
 877         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 878         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 879                                       (unsigned char *)response, resp_len);
 880         if (encoded_len < 0)
 881                 die("EVP_EncodeBlock error");
 882         return (char *)response_64;
 883 }
 884
 885 #else
 886
 887 static char *cram(const char *challenge_64 UNUSED,
 888                   const char *user UNUSED,
 889                   const char *pass UNUSED)
 890 {
 891         die("If you want to use CRAM-MD5 authenticate method, "
 892             "you have to build git-imap-send with OpenSSL library.");
 893 }
 894
 895 #endif
 896
 897 static int auth_cram_md5(struct imap_store *ctx, const char *prompt)
 898 {
 899         int ret;
 900         char *response;
 901
 902         response = cram(prompt, ctx->cfg->user, ctx->cfg->pass);
 903
 904         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 905         if (ret != strlen(response))
 906                 return error("IMAP error: sending response failed");
 907
 908         free(response);
 909
 910         return 0;
 911 }
 912
 913 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 914 {
 915         if (srvc->user && srvc->pass)
 916                 return;
 917
 918         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 919         cred->host = xstrdup(srvc->host);
 920
 921         cred->username = xstrdup_or_null(srvc->user);
 922         cred->password = xstrdup_or_null(srvc->pass);
 923
 924         credential_fill(cred, 1);
 925
 926         if (!srvc->user)
 927                 srvc->user = xstrdup(cred->username);
 928         if (!srvc->pass)
 929                 srvc->pass = xstrdup(cred->password);
 930 }
 931
 932 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
 933 {
 934         struct credential cred = CREDENTIAL_INIT;
 935         struct imap_store *ctx;
 936         struct imap *imap;
 937         char *arg, *rsp;
 938         int s = -1, preauth;
 939
 940         CALLOC_ARRAY(ctx, 1);
 941
 942         ctx->cfg = srvc;
 943         ctx->imap = CALLOC_ARRAY(imap, 1);
 944         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 945         imap->in_progress_append = &imap->in_progress;
 946
 947         /* open connection to IMAP server */
 948
 949         if (srvc->tunnel) {
 950                 struct child_process tunnel = CHILD_PROCESS_INIT;
 951
 952                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 953
 954                 strvec_push(&tunnel.args, srvc->tunnel);
 955                 tunnel.use_shell = 1;
 956                 tunnel.in = -1;
 957                 tunnel.out = -1;
 958                 if (start_command(&tunnel))
 959                         die("cannot start proxy %s", srvc->tunnel);
 960
 961                 imap->buf.sock.fd[0] = tunnel.out;
 962                 imap->buf.sock.fd[1] = tunnel.in;
 963
 964                 imap_info("ok\n");
 965         } else {
 966 #ifndef NO_IPV6
 967                 struct addrinfo hints, *ai0, *ai;
 968                 int gai;
 969                 char portstr[6];
 970
 971                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 972
 973                 memset(&hints, 0, sizeof(hints));
 974                 hints.ai_socktype = SOCK_STREAM;
 975                 hints.ai_protocol = IPPROTO_TCP;
 976
 977                 imap_info("Resolving %s... ", srvc->host);
 978                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 979                 if (gai) {
 980                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 981                         goto bail;
 982                 }
 983                 imap_info("ok\n");
 984
 985                 for (ai0 = ai; ai; ai = ai->ai_next) {
 986                         char addr[NI_MAXHOST];
 987
 988                         s = socket(ai->ai_family, ai->ai_socktype,
 989                                    ai->ai_protocol);
 990                         if (s < 0)
 991                                 continue;
 992
 993                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
 994                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
 995                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
 996
 997                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 998                                 close(s);
 999                                 s = -1;
1000                                 perror("connect");
1001                                 continue;
1002                         }
1003
1004                         break;
1005                 }
1006                 freeaddrinfo(ai0);
1007 #else /* NO_IPV6 */
1008                 struct hostent *he;
1009                 struct sockaddr_in addr;
1010
1011                 memset(&addr, 0, sizeof(addr));
1012                 addr.sin_port = htons(srvc->port);
1013                 addr.sin_family = AF_INET;
1014
1015                 imap_info("Resolving %s... ", srvc->host);
1016                 he = gethostbyname(srvc->host);
1017                 if (!he) {
1018                         perror("gethostbyname");
1019                         goto bail;
1020                 }
1021                 imap_info("ok\n");
1022
1023                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1024
1025                 s = socket(PF_INET, SOCK_STREAM, 0);
1026
1027                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1028                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1029                         close(s);
1030                         s = -1;
1031                         perror("connect");
1032                 }
1033 #endif
1034                 if (s < 0) {
1035                         fputs("Error: unable to connect to server.\n", stderr);
1036                         goto bail;
1037                 }
1038
1039                 imap->buf.sock.fd[0] = s;
1040                 imap->buf.sock.fd[1] = dup(s);
1041
1042                 if (srvc->use_ssl &&
1043                     ssl_socket_connect(&imap->buf.sock, srvc, 0)) {
1044                         close(s);
1045                         goto bail;
1046                 }
1047                 imap_info("ok\n");
1048         }
1049
1050         /* read the greeting string */
1051         if (buffer_gets(&imap->buf, &rsp)) {
1052                 fprintf(stderr, "IMAP error: no greeting response\n");
1053                 goto bail;
1054         }
1055         arg = next_arg(&rsp);
1056         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1057                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1058                 goto bail;
1059         }
1060         preauth = 0;
1061         if (!strcmp("PREAUTH", arg))
1062                 preauth = 1;
1063         else if (strcmp("OK", arg) != 0) {
1064                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1065                 goto bail;
1066         }
1067         parse_response_code(ctx, NULL, rsp);
1068         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1069                 goto bail;
1070
1071         if (!preauth) {
1072 #ifndef NO_OPENSSL
1073                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1074                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1075                                 goto bail;
1076                         if (ssl_socket_connect(&imap->buf.sock, srvc, 1))
1077                                 goto bail;
1078                         /* capabilities may have changed, so get the new capabilities */
1079                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1080                                 goto bail;
1081                 }
1082 #endif
1083                 imap_info("Logging in...\n");
1084                 server_fill_credential(srvc, &cred);
1085
1086                 if (srvc->auth_method) {
1087                         struct imap_cmd_cb cb;
1088
1089                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1090                                 if (!CAP(AUTH_CRAM_MD5)) {
1091                                         fprintf(stderr, "You specified "
1092                                                 "CRAM-MD5 as authentication method, "
1093                                                 "but %s doesn't support it.\n", srvc->host);
1094                                         goto bail;
1095                                 }
1096                                 /* CRAM-MD5 */
1097
1098                                 memset(&cb, 0, sizeof(cb));
1099                                 cb.cont = auth_cram_md5;
1100                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1101                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1102                                         goto bail;
1103                                 }
1104                         } else {
1105                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1106                                 goto bail;
1107                         }
1108                 } else {
1109                         if (CAP(NOLOGIN)) {
1110                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1111                                         srvc->user, srvc->host);
1112                                 goto bail;
1113                         }
1114                         if (!imap->buf.sock.ssl)
1115                                 imap_warn("*** IMAP Warning *** Password is being "
1116                                           "sent in the clear\n");
1117                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1118                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1119                                 goto bail;
1120                         }
1121                 }
1122         } /* !preauth */
1123
1124         if (cred.username)
1125                 credential_approve(&cred);
1126         credential_clear(&cred);
1127
1128         /* check the target mailbox exists */
1129         ctx->name = folder;
1130         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1131         case RESP_OK:
1132                 /* ok */
1133                 break;
1134         case RESP_BAD:
1135                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1136                 goto out;
1137         case RESP_NO:
1138                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1139                         imap_info("Created missing mailbox\n");
1140                 } else {
1141                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1142                         goto out;
1143                 }
1144                 break;
1145         }
1146
1147         ctx->prefix = "";
1148         return ctx;
1149
1150 bail:
1151         if (cred.username)
1152                 credential_reject(&cred);
1153         credential_clear(&cred);
1154
1155  out:
1156         imap_close_store(ctx);
1157         return NULL;
1158 }
1159
1160 /*
1161  * Insert CR characters as necessary in *msg to ensure that every LF
1162  * character in *msg is preceded by a CR.
1163  */
1164 static void lf_to_crlf(struct strbuf *msg)
1165 {
1166         char *new_msg;
1167         size_t i, j;
1168         char lastc;
1169
1170         /* First pass: tally, in j, the size of the new_msg string: */
1171         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1172                 if (msg->buf[i] == '\n' && lastc != '\r')
1173                         j++; /* a CR will need to be added here */
1174                 lastc = msg->buf[i];
1175                 j++;
1176         }
1177
1178         new_msg = xmallocz(j);
1179
1180         /*
1181          * Second pass: write the new_msg string.  Note that this loop is
1182          * otherwise identical to the first pass.
1183          */
1184         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1185                 if (msg->buf[i] == '\n' && lastc != '\r')
1186                         new_msg[j++] = '\r';
1187                 lastc = new_msg[j++] = msg->buf[i];
1188         }
1189         strbuf_attach(msg, new_msg, j, j + 1);
1190 }
1191
1192 /*
1193  * Store msg to IMAP.  Also detach and free the data from msg->data,
1194  * leaving msg->data empty.
1195  */
1196 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1197 {
1198         struct imap *imap = ctx->imap;
1199         struct imap_cmd_cb cb;
1200         const char *prefix, *box;
1201         int ret;
1202
1203         lf_to_crlf(msg);
1204         memset(&cb, 0, sizeof(cb));
1205
1206         cb.dlen = msg->len;
1207         cb.data = strbuf_detach(msg, NULL);
1208
1209         box = ctx->name;
1210         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1211         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1212         imap->caps = imap->rcaps;
1213         if (ret != DRV_OK)
1214                 return ret;
1215
1216         return DRV_OK;
1217 }
1218
1219 static void wrap_in_html(struct strbuf *msg)
1220 {
1221         struct strbuf buf = STRBUF_INIT;
1222         static const char *content_type = "Content-Type: text/html;\n";
1223         static const char *pre_open = "<pre>\n";
1224         static const char *pre_close = "</pre>\n";
1225         const char *body = strstr(msg->buf, "\n\n");
1226
1227         if (!body)
1228                 return; /* Headers but no body; no wrapping needed */
1229
1230         body += 2;
1231
1232         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1233         strbuf_addstr(&buf, content_type);
1234         strbuf_addch(&buf, '\n');
1235         strbuf_addstr(&buf, pre_open);
1236         strbuf_addstr_xml_quoted(&buf, body);
1237         strbuf_addstr(&buf, pre_close);
1238
1239         strbuf_release(msg);
1240         *msg = buf;
1241 }
1242
1243 static int count_messages(struct strbuf *all_msgs)
1244 {
1245         int count = 0;
1246         char *p = all_msgs->buf;
1247
1248         while (1) {
1249                 if (starts_with(p, "From ")) {
1250                         p = strstr(p+5, "\nFrom: ");
1251                         if (!p) break;
1252                         p = strstr(p+7, "\nDate: ");
1253                         if (!p) break;
1254                         p = strstr(p+7, "\nSubject: ");
1255                         if (!p) break;
1256                         p += 10;
1257                         count++;
1258                 }
1259                 p = strstr(p+5, "\nFrom ");
1260                 if (!p)
1261                         break;
1262                 p++;
1263         }
1264         return count;
1265 }
1266
1267 /*
1268  * Copy the next message from all_msgs, starting at offset *ofs, to
1269  * msg.  Update *ofs to the start of the following message.  Return
1270  * true iff a message was successfully copied.
1271  */
1272 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1273 {
1274         char *p, *data;
1275         size_t len;
1276
1277         if (*ofs >= all_msgs->len)
1278                 return 0;
1279
1280         data = &all_msgs->buf[*ofs];
1281         len = all_msgs->len - *ofs;
1282
1283         if (len < 5 || !starts_with(data, "From "))
1284                 return 0;
1285
1286         p = strchr(data, '\n');
1287         if (p) {
1288                 p++;
1289                 len -= p - data;
1290                 *ofs += p - data;
1291                 data = p;
1292         }
1293
1294         p = strstr(data, "\nFrom ");
1295         if (p)
1296                 len = &p[1] - data;
1297
1298         strbuf_add(msg, data, len);
1299         *ofs += len;
1300         return 1;
1301 }
1302
1303 static int git_imap_config(const char *var, const char *val,
1304                            const struct config_context *ctx, void *cb)
1305 {
1306         struct imap_server_conf *cfg = cb;
1307
1308         if (!strcmp("imap.sslverify", var)) {
1309                 cfg->ssl_verify = git_config_bool(var, val);
1310         } else if (!strcmp("imap.preformattedhtml", var)) {
1311                 cfg->use_html = git_config_bool(var, val);
1312         } else if (!strcmp("imap.folder", var)) {
1313                 FREE_AND_NULL(cfg->folder);
1314                 return git_config_string(&cfg->folder, var, val);
1315         } else if (!strcmp("imap.user", var)) {
1316                 FREE_AND_NULL(cfg->folder);
1317                 return git_config_string(&cfg->user, var, val);
1318         } else if (!strcmp("imap.pass", var)) {
1319                 FREE_AND_NULL(cfg->folder);
1320                 return git_config_string(&cfg->pass, var, val);
1321         } else if (!strcmp("imap.tunnel", var)) {
1322                 FREE_AND_NULL(cfg->folder);
1323                 return git_config_string(&cfg->tunnel, var, val);
1324         } else if (!strcmp("imap.authmethod", var)) {
1325                 FREE_AND_NULL(cfg->folder);
1326                 return git_config_string(&cfg->auth_method, var, val);
1327         } else if (!strcmp("imap.port", var)) {
1328                 cfg->port = git_config_int(var, val, ctx->kvi);
1329         } else if (!strcmp("imap.host", var)) {
1330                 if (!val) {
1331                         return config_error_nonbool(var);
1332                 } else {
1333                         if (starts_with(val, "imap:"))
1334                                 val += 5;
1335                         else if (starts_with(val, "imaps:")) {
1336                                 val += 6;
1337                                 cfg->use_ssl = 1;
1338                         }
1339                         if (starts_with(val, "//"))
1340                                 val += 2;
1341                         cfg->host = xstrdup(val);
1342                 }
1343         } else {
1344                 return git_default_config(var, val, ctx, cb);
1345         }
1346
1347         return 0;
1348 }
1349
1350 static int append_msgs_to_imap(struct imap_server_conf *server,
1351                                struct strbuf* all_msgs, int total)
1352 {
1353         struct strbuf msg = STRBUF_INIT;
1354         struct imap_store *ctx = NULL;
1355         int ofs = 0;
1356         int r;
1357         int n = 0;
1358
1359         ctx = imap_open_store(server, server->folder);
1360         if (!ctx) {
1361                 fprintf(stderr, "failed to open store\n");
1362                 return 1;
1363         }
1364         ctx->name = server->folder;
1365
1366         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1367         while (1) {
1368                 unsigned percent = n * 100 / total;
1369
1370                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1371
1372                 if (!split_msg(all_msgs, &msg, &ofs))
1373                         break;
1374                 if (server->use_html)
1375                         wrap_in_html(&msg);
1376                 r = imap_store_msg(ctx, &msg);
1377                 if (r != DRV_OK)
1378                         break;
1379                 n++;
1380         }
1381         fprintf(stderr, "\n");
1382
1383         imap_close_store(ctx);
1384
1385         return 0;
1386 }
1387
1388 #ifdef USE_CURL_FOR_IMAP_SEND
1389 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1390 {
1391         CURL *curl;
1392         struct strbuf path = STRBUF_INIT;
1393         char *uri_encoded_folder;
1394
1395         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1396                 die("curl_global_init failed");
1397
1398         curl = curl_easy_init();
1399
1400         if (!curl)
1401                 die("curl_easy_init failed");
1402
1403         server_fill_credential(srvc, cred);
1404         curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
1405         curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
1406
1407         strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
1408         strbuf_addstr(&path, srvc->host);
1409         if (!path.len || path.buf[path.len - 1] != '/')
1410                 strbuf_addch(&path, '/');
1411
1412         uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
1413         if (!uri_encoded_folder)
1414                 die("failed to encode server folder");
1415         strbuf_addstr(&path, uri_encoded_folder);
1416         curl_free(uri_encoded_folder);
1417
1418         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1419         strbuf_release(&path);
1420         curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
1421
1422         if (srvc->auth_method) {
1423 #ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
1424                 warning("No LOGIN_OPTIONS support in this cURL version");
1425 #else
1426                 struct strbuf auth = STRBUF_INIT;
1427                 strbuf_addstr(&auth, "AUTH=");
1428                 strbuf_addstr(&auth, srvc->auth_method);
1429                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1430                 strbuf_release(&auth);
1431 #endif
1432         }
1433
1434         if (!srvc->use_ssl)
1435                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1436
1437         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
1438         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
1439
1440         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1441
1442         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1443
1444         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1445                 http_trace_curl_no_data();
1446         setup_curl_trace(curl);
1447
1448         return curl;
1449 }
1450
1451 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1452                                     struct strbuf* all_msgs, int total)
1453 {
1454         int ofs = 0;
1455         int n = 0;
1456         struct buffer msgbuf = { STRBUF_INIT, 0 };
1457         CURL *curl;
1458         CURLcode res = CURLE_OK;
1459         struct credential cred = CREDENTIAL_INIT;
1460
1461         curl = setup_curl(server, &cred);
1462         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1463
1464         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1465         while (1) {
1466                 unsigned percent = n * 100 / total;
1467                 int prev_len;
1468
1469                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1470
1471                 prev_len = msgbuf.buf.len;
1472                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1473                         break;
1474                 if (server->use_html)
1475                         wrap_in_html(&msgbuf.buf);
1476                 lf_to_crlf(&msgbuf.buf);
1477
1478                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1479                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1480
1481                 res = curl_easy_perform(curl);
1482
1483                 if(res != CURLE_OK) {
1484                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1485                                         curl_easy_strerror(res));
1486                         break;
1487                 }
1488
1489                 n++;
1490         }
1491         fprintf(stderr, "\n");
1492
1493         curl_easy_cleanup(curl);
1494         curl_global_cleanup();
1495
1496         if (cred.username) {
1497                 if (res == CURLE_OK)
1498                         credential_approve(&cred);
1499                 else if (res == CURLE_LOGIN_DENIED)
1500                         credential_reject(&cred);
1501         }
1502
1503         credential_clear(&cred);
1504
1505         return res != CURLE_OK;
1506 }
1507 #endif
1508
1509 int cmd_main(int argc, const char **argv)
1510 {
1511         struct imap_server_conf server = {
1512                 .ssl_verify = 1,
1513         };
1514         struct strbuf all_msgs = STRBUF_INIT;
1515         int total;
1516         int nongit_ok;
1517         int ret;
1518
1519         setup_git_directory_gently(&nongit_ok);
1520         git_config(git_imap_config, &server);
1521
1522         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1523
1524         if (argc)
1525                 usage_with_options(imap_send_usage, imap_send_options);
1526
1527 #ifndef USE_CURL_FOR_IMAP_SEND
1528         if (use_curl) {
1529                 warning("--curl not supported in this build");
1530                 use_curl = 0;
1531         }
1532 #elif defined(NO_OPENSSL)
1533         if (!use_curl) {
1534                 warning("--no-curl not supported in this build");
1535                 use_curl = 1;
1536         }
1537 #endif
1538
1539         if (!server.port)
1540                 server.port = server.use_ssl ? 993 : 143;
1541
1542         if (!server.folder) {
1543                 fprintf(stderr, "no imap store specified\n");
1544                 ret = 1;
1545                 goto out;
1546         }
1547         if (!server.host) {
1548                 if (!server.tunnel) {
1549                         fprintf(stderr, "no imap host specified\n");
1550                         ret = 1;
1551                         goto out;
1552                 }
1553                 server.host = xstrdup("tunnel");
1554         }
1555
1556         /* read the messages */
1557         if (strbuf_read(&all_msgs, 0, 0) < 0) {
1558                 error_errno(_("could not read from stdin"));
1559                 ret = 1;
1560                 goto out;
1561         }
1562
1563         if (all_msgs.len == 0) {
1564                 fprintf(stderr, "nothing to send\n");
1565                 ret = 1;
1566                 goto out;
1567         }
1568
1569         total = count_messages(&all_msgs);
1570         if (!total) {
1571                 fprintf(stderr, "no messages to send\n");
1572                 ret = 1;
1573                 goto out;
1574         }
1575
1576         /* write it to the imap server */
1577
1578         if (server.tunnel)
1579                 ret = append_msgs_to_imap(&server, &all_msgs, total);
1580 #ifdef USE_CURL_FOR_IMAP_SEND
1581         else if (use_curl)
1582                 ret = curl_append_msgs_to_imap(&server, &all_msgs, total);
1583 #endif
1584         else
1585                 ret = append_msgs_to_imap(&server, &all_msgs, total);
1586
1587 out:
1588         free(server.tunnel);
1589         free(server.host);
1590         free(server.folder);
1591         free(server.user);
1592         free(server.pass);
1593         free(server.auth_method);
1594         strbuf_release(&all_msgs);
1595         return ret;
1596 }