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