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 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
  32 typedef void *SSL;
  33 #endif
  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 __attribute__((format (printf, 3, 4)))
  71 static int nfsnprintf(char *buf, int blen, const char *fmt, ...);
  72
  73 static int nfvasprintf(char **strp, const char *fmt, va_list ap)
  74 {
  75         int len;
  76         char tmp[8192];
  77
  78         len = vsnprintf(tmp, sizeof(tmp), fmt, ap);
  79         if (len < 0)
  80                 die("Fatal: Out of memory");
  81         if (len >= sizeof(tmp))
  82                 die("imap command overflow!");
  83         *strp = xmemdupz(tmp, len);
  84         return len;
  85 }
  86
  87 struct imap_server_conf {
  88         const char *name;
  89         const char *tunnel;
  90         const char *host;
  91         int port;
  92         const char *folder;
  93         const char *user;
  94         const char *pass;
  95         int use_ssl;
  96         int ssl_verify;
  97         int use_html;
  98         const char *auth_method;
  99 };
 100
 101 static struct imap_server_conf server = {
 102         .ssl_verify = 1,
 103 };
 104
 105 struct imap_socket {
 106         int fd[2];
 107         SSL *ssl;
 108 };
 109
 110 struct imap_buffer {
 111         struct imap_socket sock;
 112         int bytes;
 113         int offset;
 114         char buf[1024];
 115 };
 116
 117 struct imap_cmd;
 118
 119 struct imap {
 120         int uidnext; /* from SELECT responses */
 121         unsigned caps, rcaps; /* CAPABILITY results */
 122         /* command queue */
 123         int nexttag, num_in_progress, literal_pending;
 124         struct imap_cmd *in_progress, **in_progress_append;
 125         struct imap_buffer buf; /* this is BIG, so put it last */
 126 };
 127
 128 struct imap_store {
 129         /* currently open mailbox */
 130         const char *name; /* foreign! maybe preset? */
 131         int uidvalidity;
 132         struct imap *imap;
 133         const char *prefix;
 134 };
 135
 136 struct imap_cmd_cb {
 137         int (*cont)(struct imap_store *ctx, const char *prompt);
 138         void *ctx;
 139         char *data;
 140         int dlen;
 141 };
 142
 143 struct imap_cmd {
 144         struct imap_cmd *next;
 145         struct imap_cmd_cb cb;
 146         char *cmd;
 147         int tag;
 148 };
 149
 150 #define CAP(cap) (imap->caps & (1 << (cap)))
 151
 152 enum CAPABILITY {
 153         NOLOGIN = 0,
 154         UIDPLUS,
 155         LITERALPLUS,
 156         NAMESPACE,
 157         STARTTLS,
 158         AUTH_CRAM_MD5
 159 };
 160
 161 static const char *cap_list[] = {
 162         "LOGINDISABLED",
 163         "UIDPLUS",
 164         "LITERAL+",
 165         "NAMESPACE",
 166         "STARTTLS",
 167         "AUTH=CRAM-MD5",
 168 };
 169
 170 #define RESP_OK    0
 171 #define RESP_NO    1
 172 #define RESP_BAD   2
 173
 174 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 175
 176
 177 #ifndef NO_OPENSSL
 178 static void ssl_socket_perror(const char *func)
 179 {
 180         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 181 }
 182 #endif
 183
 184 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 185 {
 186 #ifndef NO_OPENSSL
 187         if (sock->ssl) {
 188                 int sslerr = SSL_get_error(sock->ssl, ret);
 189                 switch (sslerr) {
 190                 case SSL_ERROR_NONE:
 191                         break;
 192                 case SSL_ERROR_SYSCALL:
 193                         perror("SSL_connect");
 194                         break;
 195                 default:
 196                         ssl_socket_perror("SSL_connect");
 197                         break;
 198                 }
 199         } else
 200 #endif
 201         {
 202                 if (ret < 0)
 203                         perror(func);
 204                 else
 205                         fprintf(stderr, "%s: unexpected EOF\n", func);
 206         }
 207         /* mark as used to appease -Wunused-parameter with NO_OPENSSL */
 208         (void)sock;
 209 }
 210
 211 #ifdef NO_OPENSSL
 212 static int ssl_socket_connect(struct imap_socket *sock UNUSED,
 213                               int use_tls_only UNUSED,
 214                               int verify UNUSED)
 215 {
 216         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 217         return -1;
 218 }
 219
 220 #else
 221
 222 static int host_matches(const char *host, const char *pattern)
 223 {
 224         if (pattern[0] == '*' && pattern[1] == '.') {
 225                 pattern += 2;
 226                 if (!(host = strchr(host, '.')))
 227                         return 0;
 228                 host++;
 229         }
 230
 231         return *host && *pattern && !strcasecmp(host, pattern);
 232 }
 233
 234 static int verify_hostname(X509 *cert, const char *hostname)
 235 {
 236         int len;
 237         X509_NAME *subj;
 238         char cname[1000];
 239         int i, found;
 240         STACK_OF(GENERAL_NAME) *subj_alt_names;
 241
 242         /* try the DNS subjectAltNames */
 243         found = 0;
 244         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
 245                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
 246                 for (i = 0; !found && i < num_subj_alt_names; i++) {
 247                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 248                         if (subj_alt_name->type == GEN_DNS &&
 249                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
 250                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
 251                                 found = 1;
 252                 }
 253                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
 254         }
 255         if (found)
 256                 return 0;
 257
 258         /* try the common name */
 259         if (!(subj = X509_get_subject_name(cert)))
 260                 return error("cannot get certificate subject");
 261         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
 262                 return error("cannot get certificate common name");
 263         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
 264                 return 0;
 265         return error("certificate owner '%s' does not match hostname '%s'",
 266                      cname, hostname);
 267 }
 268
 269 static int ssl_socket_connect(struct imap_socket *sock, int use_tls_only, int verify)
 270 {
 271 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 272         const SSL_METHOD *meth;
 273 #else
 274         SSL_METHOD *meth;
 275 #endif
 276         SSL_CTX *ctx;
 277         int ret;
 278         X509 *cert;
 279
 280         SSL_library_init();
 281         SSL_load_error_strings();
 282
 283         meth = SSLv23_method();
 284         if (!meth) {
 285                 ssl_socket_perror("SSLv23_method");
 286                 return -1;
 287         }
 288
 289         ctx = SSL_CTX_new(meth);
 290         if (!ctx) {
 291                 ssl_socket_perror("SSL_CTX_new");
 292                 return -1;
 293         }
 294
 295         if (use_tls_only)
 296                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 297
 298         if (verify)
 299                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 300
 301         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 302                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 303                 return -1;
 304         }
 305         sock->ssl = SSL_new(ctx);
 306         if (!sock->ssl) {
 307                 ssl_socket_perror("SSL_new");
 308                 return -1;
 309         }
 310         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 311                 ssl_socket_perror("SSL_set_rfd");
 312                 return -1;
 313         }
 314         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 315                 ssl_socket_perror("SSL_set_wfd");
 316                 return -1;
 317         }
 318
 319 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 320         /*
 321          * SNI (RFC4366)
 322          * OpenSSL does not document this function, but the implementation
 323          * returns 1 on success, 0 on failure after calling SSLerr().
 324          */
 325         ret = SSL_set_tlsext_host_name(sock->ssl, server.host);
 326         if (ret != 1)
 327                 warning("SSL_set_tlsext_host_name(%s) failed.", server.host);
 328 #endif
 329
 330         ret = SSL_connect(sock->ssl);
 331         if (ret <= 0) {
 332                 socket_perror("SSL_connect", sock, ret);
 333                 return -1;
 334         }
 335
 336         if (verify) {
 337                 /* make sure the hostname matches that of the certificate */
 338                 cert = SSL_get_peer_certificate(sock->ssl);
 339                 if (!cert)
 340                         return error("unable to get peer certificate.");
 341                 if (verify_hostname(cert, server.host) < 0)
 342                         return -1;
 343         }
 344
 345         return 0;
 346 }
 347 #endif
 348
 349 static int socket_read(struct imap_socket *sock, char *buf, int len)
 350 {
 351         ssize_t n;
 352 #ifndef NO_OPENSSL
 353         if (sock->ssl)
 354                 n = SSL_read(sock->ssl, buf, len);
 355         else
 356 #endif
 357                 n = xread(sock->fd[0], buf, len);
 358         if (n <= 0) {
 359                 socket_perror("read", 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 int socket_write(struct imap_socket *sock, const char *buf, int len)
 368 {
 369         int n;
 370 #ifndef NO_OPENSSL
 371         if (sock->ssl)
 372                 n = SSL_write(sock->ssl, buf, len);
 373         else
 374 #endif
 375                 n = write_in_full(sock->fd[1], buf, len);
 376         if (n != len) {
 377                 socket_perror("write", sock, n);
 378                 close(sock->fd[0]);
 379                 close(sock->fd[1]);
 380                 sock->fd[0] = sock->fd[1] = -1;
 381         }
 382         return n;
 383 }
 384
 385 static void socket_shutdown(struct imap_socket *sock)
 386 {
 387 #ifndef NO_OPENSSL
 388         if (sock->ssl) {
 389                 SSL_shutdown(sock->ssl);
 390                 SSL_free(sock->ssl);
 391         }
 392 #endif
 393         close(sock->fd[0]);
 394         close(sock->fd[1]);
 395 }
 396
 397 /* simple line buffering */
 398 static int buffer_gets(struct imap_buffer *b, char **s)
 399 {
 400         int n;
 401         int start = b->offset;
 402
 403         *s = b->buf + start;
 404
 405         for (;;) {
 406                 /* make sure we have enough data to read the \r\n sequence */
 407                 if (b->offset + 1 >= b->bytes) {
 408                         if (start) {
 409                                 /* shift down used bytes */
 410                                 *s = b->buf;
 411
 412                                 assert(start <= b->bytes);
 413                                 n = b->bytes - start;
 414
 415                                 if (n)
 416                                         memmove(b->buf, b->buf + start, n);
 417                                 b->offset -= start;
 418                                 b->bytes = n;
 419                                 start = 0;
 420                         }
 421
 422                         n = socket_read(&b->sock, b->buf + b->bytes,
 423                                          sizeof(b->buf) - b->bytes);
 424
 425                         if (n <= 0)
 426                                 return -1;
 427
 428                         b->bytes += n;
 429                 }
 430
 431                 if (b->buf[b->offset] == '\r') {
 432                         assert(b->offset + 1 < b->bytes);
 433                         if (b->buf[b->offset + 1] == '\n') {
 434                                 b->buf[b->offset] = 0;  /* terminate the string */
 435                                 b->offset += 2; /* next line */
 436                                 if (0 < verbosity)
 437                                         puts(*s);
 438                                 return 0;
 439                         }
 440                 }
 441
 442                 b->offset++;
 443         }
 444         /* not reached */
 445 }
 446
 447 __attribute__((format (printf, 1, 2)))
 448 static void imap_info(const char *msg, ...)
 449 {
 450         va_list va;
 451
 452         if (0 <= verbosity) {
 453                 va_start(va, msg);
 454                 vprintf(msg, va);
 455                 va_end(va);
 456                 fflush(stdout);
 457         }
 458 }
 459
 460 __attribute__((format (printf, 1, 2)))
 461 static void imap_warn(const char *msg, ...)
 462 {
 463         va_list va;
 464
 465         if (-2 < verbosity) {
 466                 va_start(va, msg);
 467                 vfprintf(stderr, msg, va);
 468                 va_end(va);
 469         }
 470 }
 471
 472 static char *next_arg(char **s)
 473 {
 474         char *ret;
 475
 476         if (!s || !*s)
 477                 return NULL;
 478         while (isspace((unsigned char) **s))
 479                 (*s)++;
 480         if (!**s) {
 481                 *s = NULL;
 482                 return NULL;
 483         }
 484         if (**s == '"') {
 485                 ++*s;
 486                 ret = *s;
 487                 *s = strchr(*s, '"');
 488         } else {
 489                 ret = *s;
 490                 while (**s && !isspace((unsigned char) **s))
 491                         (*s)++;
 492         }
 493         if (*s) {
 494                 if (**s)
 495                         *(*s)++ = 0;
 496                 if (!**s)
 497                         *s = NULL;
 498         }
 499         return ret;
 500 }
 501
 502 __attribute__((format (printf, 3, 4)))
 503 static int nfsnprintf(char *buf, int blen, const char *fmt, ...)
 504 {
 505         int ret;
 506         va_list va;
 507
 508         va_start(va, fmt);
 509         if (blen <= 0 || (unsigned)(ret = vsnprintf(buf, blen, fmt, va)) >= (unsigned)blen)
 510                 BUG("buffer too small. Please report a bug.");
 511         va_end(va);
 512         return ret;
 513 }
 514
 515 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 516                                        struct imap_cmd_cb *cb,
 517                                        const char *fmt, va_list ap)
 518 {
 519         struct imap *imap = ctx->imap;
 520         struct imap_cmd *cmd;
 521         int n, bufl;
 522         char buf[1024];
 523
 524         cmd = xmalloc(sizeof(struct imap_cmd));
 525         nfvasprintf(&cmd->cmd, fmt, ap);
 526         cmd->tag = ++imap->nexttag;
 527
 528         if (cb)
 529                 cmd->cb = *cb;
 530         else
 531                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 532
 533         while (imap->literal_pending)
 534                 get_cmd_result(ctx, NULL);
 535
 536         if (!cmd->cb.data)
 537                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s\r\n", cmd->tag, cmd->cmd);
 538         else
 539                 bufl = nfsnprintf(buf, sizeof(buf), "%d %s{%d%s}\r\n",
 540                                   cmd->tag, cmd->cmd, cmd->cb.dlen,
 541                                   CAP(LITERALPLUS) ? "+" : "");
 542
 543         if (0 < verbosity) {
 544                 if (imap->num_in_progress)
 545                         printf("(%d in progress) ", imap->num_in_progress);
 546                 if (!starts_with(cmd->cmd, "LOGIN"))
 547                         printf(">>> %s", buf);
 548                 else
 549                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 550         }
 551         if (socket_write(&imap->buf.sock, buf, bufl) != bufl) {
 552                 free(cmd->cmd);
 553                 free(cmd);
 554                 if (cb)
 555                         free(cb->data);
 556                 return NULL;
 557         }
 558         if (cmd->cb.data) {
 559                 if (CAP(LITERALPLUS)) {
 560                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 561                         free(cmd->cb.data);
 562                         if (n != cmd->cb.dlen ||
 563                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 564                                 free(cmd->cmd);
 565                                 free(cmd);
 566                                 return NULL;
 567                         }
 568                         cmd->cb.data = NULL;
 569                 } else
 570                         imap->literal_pending = 1;
 571         } else if (cmd->cb.cont)
 572                 imap->literal_pending = 1;
 573         cmd->next = NULL;
 574         *imap->in_progress_append = cmd;
 575         imap->in_progress_append = &cmd->next;
 576         imap->num_in_progress++;
 577         return cmd;
 578 }
 579
 580 __attribute__((format (printf, 3, 4)))
 581 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 582                      const char *fmt, ...)
 583 {
 584         va_list ap;
 585         struct imap_cmd *cmdp;
 586
 587         va_start(ap, fmt);
 588         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 589         va_end(ap);
 590         if (!cmdp)
 591                 return RESP_BAD;
 592
 593         return get_cmd_result(ctx, cmdp);
 594 }
 595
 596 __attribute__((format (printf, 3, 4)))
 597 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 598                        const char *fmt, ...)
 599 {
 600         va_list ap;
 601         struct imap_cmd *cmdp;
 602
 603         va_start(ap, fmt);
 604         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 605         va_end(ap);
 606         if (!cmdp)
 607                 return DRV_STORE_BAD;
 608
 609         switch (get_cmd_result(ctx, cmdp)) {
 610         case RESP_BAD: return DRV_STORE_BAD;
 611         case RESP_NO: return DRV_MSG_BAD;
 612         default: return DRV_OK;
 613         }
 614 }
 615
 616 static int skip_imap_list_l(char **sp, int level)
 617 {
 618         char *s = *sp;
 619
 620         for (;;) {
 621                 while (isspace((unsigned char)*s))
 622                         s++;
 623                 if (level && *s == ')') {
 624                         s++;
 625                         break;
 626                 }
 627                 if (*s == '(') {
 628                         /* sublist */
 629                         s++;
 630                         if (skip_imap_list_l(&s, level + 1))
 631                                 goto bail;
 632                 } else if (*s == '"') {
 633                         /* quoted string */
 634                         s++;
 635                         for (; *s != '"'; s++)
 636                                 if (!*s)
 637                                         goto bail;
 638                         s++;
 639                 } else {
 640                         /* atom */
 641                         for (; *s && !isspace((unsigned char)*s); s++)
 642                                 if (level && *s == ')')
 643                                         break;
 644                 }
 645
 646                 if (!level)
 647                         break;
 648                 if (!*s)
 649                         goto bail;
 650         }
 651         *sp = s;
 652         return 0;
 653
 654 bail:
 655         return -1;
 656 }
 657
 658 static void skip_list(char **sp)
 659 {
 660         skip_imap_list_l(sp, 0);
 661 }
 662
 663 static void parse_capability(struct imap *imap, char *cmd)
 664 {
 665         char *arg;
 666         unsigned i;
 667
 668         imap->caps = 0x80000000;
 669         while ((arg = next_arg(&cmd)))
 670                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 671                         if (!strcmp(cap_list[i], arg))
 672                                 imap->caps |= 1 << i;
 673         imap->rcaps = imap->caps;
 674 }
 675
 676 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 677                                char *s)
 678 {
 679         struct imap *imap = ctx->imap;
 680         char *arg, *p;
 681
 682         if (!s || *s != '[')
 683                 return RESP_OK;         /* no response code */
 684         s++;
 685         if (!(p = strchr(s, ']'))) {
 686                 fprintf(stderr, "IMAP error: malformed response code\n");
 687                 return RESP_BAD;
 688         }
 689         *p++ = 0;
 690         arg = next_arg(&s);
 691         if (!arg) {
 692                 fprintf(stderr, "IMAP error: empty response code\n");
 693                 return RESP_BAD;
 694         }
 695         if (!strcmp("UIDVALIDITY", arg)) {
 696                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 697                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 698                         return RESP_BAD;
 699                 }
 700         } else if (!strcmp("UIDNEXT", arg)) {
 701                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 702                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 703                         return RESP_BAD;
 704                 }
 705         } else if (!strcmp("CAPABILITY", arg)) {
 706                 parse_capability(imap, s);
 707         } else if (!strcmp("ALERT", arg)) {
 708                 /* RFC2060 says that these messages MUST be displayed
 709                  * to the user
 710                  */
 711                 for (; isspace((unsigned char)*p); p++);
 712                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 713         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 714                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 715                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 716                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 717                         return RESP_BAD;
 718                 }
 719         }
 720         return RESP_OK;
 721 }
 722
 723 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 724 {
 725         struct imap *imap = ctx->imap;
 726         struct imap_cmd *cmdp, **pcmdp;
 727         char *cmd;
 728         const char *arg, *arg1;
 729         int n, resp, resp2, tag;
 730
 731         for (;;) {
 732                 if (buffer_gets(&imap->buf, &cmd))
 733                         return RESP_BAD;
 734
 735                 arg = next_arg(&cmd);
 736                 if (!arg) {
 737                         fprintf(stderr, "IMAP error: empty response\n");
 738                         return RESP_BAD;
 739                 }
 740                 if (*arg == '*') {
 741                         arg = next_arg(&cmd);
 742                         if (!arg) {
 743                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 744                                 return RESP_BAD;
 745                         }
 746
 747                         if (!strcmp("NAMESPACE", arg)) {
 748                                 /* rfc2342 NAMESPACE response. */
 749                                 skip_list(&cmd); /* Personal mailboxes */
 750                                 skip_list(&cmd); /* Others' mailboxes */
 751                                 skip_list(&cmd); /* Shared mailboxes */
 752                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 753                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 754                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 755                                         return resp;
 756                         } else if (!strcmp("CAPABILITY", arg)) {
 757                                 parse_capability(imap, cmd);
 758                         } else if ((arg1 = next_arg(&cmd))) {
 759                                 ; /*
 760                                    * Unhandled response-data with at least two words.
 761                                    * Ignore it.
 762                                    *
 763                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 764                                    * and '<num> RECENT' but as a probably-unintended side
 765                                    * effect it ignores other unrecognized two-word
 766                                    * responses.  imap-send doesn't ever try to read
 767                                    * messages or mailboxes these days, so consider
 768                                    * eliminating this case.
 769                                    */
 770                         } else {
 771                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 772                                 return RESP_BAD;
 773                         }
 774                 } else if (!imap->in_progress) {
 775                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 776                         return RESP_BAD;
 777                 } else if (*arg == '+') {
 778                         /* This can happen only with the last command underway, as
 779                            it enforces a round-trip. */
 780                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 781                                offsetof(struct imap_cmd, next));
 782                         if (cmdp->cb.data) {
 783                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 784                                 FREE_AND_NULL(cmdp->cb.data);
 785                                 if (n != (int)cmdp->cb.dlen)
 786                                         return RESP_BAD;
 787                         } else if (cmdp->cb.cont) {
 788                                 if (cmdp->cb.cont(ctx, cmd))
 789                                         return RESP_BAD;
 790                         } else {
 791                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 792                                 return RESP_BAD;
 793                         }
 794                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 795                                 return RESP_BAD;
 796                         if (!cmdp->cb.cont)
 797                                 imap->literal_pending = 0;
 798                         if (!tcmd)
 799                                 return DRV_OK;
 800                 } else {
 801                         tag = atoi(arg);
 802                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 803                                 if (cmdp->tag == tag)
 804                                         goto gottag;
 805                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 806                         return RESP_BAD;
 807                 gottag:
 808                         if (!(*pcmdp = cmdp->next))
 809                                 imap->in_progress_append = pcmdp;
 810                         imap->num_in_progress--;
 811                         if (cmdp->cb.cont || cmdp->cb.data)
 812                                 imap->literal_pending = 0;
 813                         arg = next_arg(&cmd);
 814                         if (!arg)
 815                                 arg = "";
 816                         if (!strcmp("OK", arg))
 817                                 resp = DRV_OK;
 818                         else {
 819                                 if (!strcmp("NO", arg))
 820                                         resp = RESP_NO;
 821                                 else /*if (!strcmp("BAD", arg))*/
 822                                         resp = RESP_BAD;
 823                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 824                                         !starts_with(cmdp->cmd, "LOGIN") ?
 825                                                         cmdp->cmd : "LOGIN <user> <pass>",
 826                                                         arg, cmd ? cmd : "");
 827                         }
 828                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 829                                 resp = resp2;
 830                         free(cmdp->cb.data);
 831                         free(cmdp->cmd);
 832                         free(cmdp);
 833                         if (!tcmd || tcmd == cmdp)
 834                                 return resp;
 835                 }
 836         }
 837         /* not reached */
 838 }
 839
 840 static void imap_close_server(struct imap_store *ictx)
 841 {
 842         struct imap *imap = ictx->imap;
 843
 844         if (imap->buf.sock.fd[0] != -1) {
 845                 imap_exec(ictx, NULL, "LOGOUT");
 846                 socket_shutdown(&imap->buf.sock);
 847         }
 848         free(imap);
 849 }
 850
 851 static void imap_close_store(struct imap_store *ctx)
 852 {
 853         imap_close_server(ctx);
 854         free(ctx);
 855 }
 856
 857 #ifndef NO_OPENSSL
 858
 859 /*
 860  * hexchar() and cram() functions are based on the code from the isync
 861  * project (https://isync.sourceforge.io/).
 862  */
 863 static char hexchar(unsigned int b)
 864 {
 865         return b < 10 ? '0' + b : 'a' + (b - 10);
 866 }
 867
 868 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 869 static char *cram(const char *challenge_64, const char *user, const char *pass)
 870 {
 871         int i, resp_len, encoded_len, decoded_len;
 872         unsigned char hash[16];
 873         char hex[33];
 874         char *response, *response_64, *challenge;
 875
 876         /*
 877          * length of challenge_64 (i.e. base-64 encoded string) is a good
 878          * enough upper bound for challenge (decoded result).
 879          */
 880         encoded_len = strlen(challenge_64);
 881         challenge = xmalloc(encoded_len);
 882         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 883                                       (unsigned char *)challenge_64, encoded_len);
 884         if (decoded_len < 0)
 885                 die("invalid challenge %s", challenge_64);
 886         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 887                 die("HMAC error");
 888
 889         hex[32] = 0;
 890         for (i = 0; i < 16; i++) {
 891                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 892                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 893         }
 894
 895         /* response: "<user> <digest in hex>" */
 896         response = xstrfmt("%s %s", user, hex);
 897         resp_len = strlen(response);
 898
 899         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 900         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 901                                       (unsigned char *)response, resp_len);
 902         if (encoded_len < 0)
 903                 die("EVP_EncodeBlock error");
 904         return (char *)response_64;
 905 }
 906
 907 #else
 908
 909 static char *cram(const char *challenge_64 UNUSED,
 910                   const char *user UNUSED,
 911                   const char *pass UNUSED)
 912 {
 913         die("If you want to use CRAM-MD5 authenticate method, "
 914             "you have to build git-imap-send with OpenSSL library.");
 915 }
 916
 917 #endif
 918
 919 static int auth_cram_md5(struct imap_store *ctx, const char *prompt)
 920 {
 921         int ret;
 922         char *response;
 923
 924         response = cram(prompt, server.user, server.pass);
 925
 926         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 927         if (ret != strlen(response))
 928                 return error("IMAP error: sending response failed");
 929
 930         free(response);
 931
 932         return 0;
 933 }
 934
 935 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 936 {
 937         if (srvc->user && srvc->pass)
 938                 return;
 939
 940         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 941         cred->host = xstrdup(srvc->host);
 942
 943         cred->username = xstrdup_or_null(srvc->user);
 944         cred->password = xstrdup_or_null(srvc->pass);
 945
 946         credential_fill(cred);
 947
 948         if (!srvc->user)
 949                 srvc->user = xstrdup(cred->username);
 950         if (!srvc->pass)
 951                 srvc->pass = xstrdup(cred->password);
 952 }
 953
 954 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
 955 {
 956         struct credential cred = CREDENTIAL_INIT;
 957         struct imap_store *ctx;
 958         struct imap *imap;
 959         char *arg, *rsp;
 960         int s = -1, preauth;
 961
 962         CALLOC_ARRAY(ctx, 1);
 963
 964         ctx->imap = CALLOC_ARRAY(imap, 1);
 965         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 966         imap->in_progress_append = &imap->in_progress;
 967
 968         /* open connection to IMAP server */
 969
 970         if (srvc->tunnel) {
 971                 struct child_process tunnel = CHILD_PROCESS_INIT;
 972
 973                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 974
 975                 strvec_push(&tunnel.args, srvc->tunnel);
 976                 tunnel.use_shell = 1;
 977                 tunnel.in = -1;
 978                 tunnel.out = -1;
 979                 if (start_command(&tunnel))
 980                         die("cannot start proxy %s", srvc->tunnel);
 981
 982                 imap->buf.sock.fd[0] = tunnel.out;
 983                 imap->buf.sock.fd[1] = tunnel.in;
 984
 985                 imap_info("ok\n");
 986         } else {
 987 #ifndef NO_IPV6
 988                 struct addrinfo hints, *ai0, *ai;
 989                 int gai;
 990                 char portstr[6];
 991
 992                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 993
 994                 memset(&hints, 0, sizeof(hints));
 995                 hints.ai_socktype = SOCK_STREAM;
 996                 hints.ai_protocol = IPPROTO_TCP;
 997
 998                 imap_info("Resolving %s... ", srvc->host);
 999                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
1000                 if (gai) {
1001                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
1002                         goto bail;
1003                 }
1004                 imap_info("ok\n");
1005
1006                 for (ai0 = ai; ai; ai = ai->ai_next) {
1007                         char addr[NI_MAXHOST];
1008
1009                         s = socket(ai->ai_family, ai->ai_socktype,
1010                                    ai->ai_protocol);
1011                         if (s < 0)
1012                                 continue;
1013
1014                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
1015                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
1016                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
1017
1018                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
1019                                 close(s);
1020                                 s = -1;
1021                                 perror("connect");
1022                                 continue;
1023                         }
1024
1025                         break;
1026                 }
1027                 freeaddrinfo(ai0);
1028 #else /* NO_IPV6 */
1029                 struct hostent *he;
1030                 struct sockaddr_in addr;
1031
1032                 memset(&addr, 0, sizeof(addr));
1033                 addr.sin_port = htons(srvc->port);
1034                 addr.sin_family = AF_INET;
1035
1036                 imap_info("Resolving %s... ", srvc->host);
1037                 he = gethostbyname(srvc->host);
1038                 if (!he) {
1039                         perror("gethostbyname");
1040                         goto bail;
1041                 }
1042                 imap_info("ok\n");
1043
1044                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1045
1046                 s = socket(PF_INET, SOCK_STREAM, 0);
1047
1048                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1049                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1050                         close(s);
1051                         s = -1;
1052                         perror("connect");
1053                 }
1054 #endif
1055                 if (s < 0) {
1056                         fputs("Error: unable to connect to server.\n", stderr);
1057                         goto bail;
1058                 }
1059
1060                 imap->buf.sock.fd[0] = s;
1061                 imap->buf.sock.fd[1] = dup(s);
1062
1063                 if (srvc->use_ssl &&
1064                     ssl_socket_connect(&imap->buf.sock, 0, srvc->ssl_verify)) {
1065                         close(s);
1066                         goto bail;
1067                 }
1068                 imap_info("ok\n");
1069         }
1070
1071         /* read the greeting string */
1072         if (buffer_gets(&imap->buf, &rsp)) {
1073                 fprintf(stderr, "IMAP error: no greeting response\n");
1074                 goto bail;
1075         }
1076         arg = next_arg(&rsp);
1077         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1078                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1079                 goto bail;
1080         }
1081         preauth = 0;
1082         if (!strcmp("PREAUTH", arg))
1083                 preauth = 1;
1084         else if (strcmp("OK", arg) != 0) {
1085                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1086                 goto bail;
1087         }
1088         parse_response_code(ctx, NULL, rsp);
1089         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1090                 goto bail;
1091
1092         if (!preauth) {
1093 #ifndef NO_OPENSSL
1094                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1095                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1096                                 goto bail;
1097                         if (ssl_socket_connect(&imap->buf.sock, 1,
1098                                                srvc->ssl_verify))
1099                                 goto bail;
1100                         /* capabilities may have changed, so get the new capabilities */
1101                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1102                                 goto bail;
1103                 }
1104 #endif
1105                 imap_info("Logging in...\n");
1106                 server_fill_credential(srvc, &cred);
1107
1108                 if (srvc->auth_method) {
1109                         struct imap_cmd_cb cb;
1110
1111                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1112                                 if (!CAP(AUTH_CRAM_MD5)) {
1113                                         fprintf(stderr, "You specified "
1114                                                 "CRAM-MD5 as authentication method, "
1115                                                 "but %s doesn't support it.\n", srvc->host);
1116                                         goto bail;
1117                                 }
1118                                 /* CRAM-MD5 */
1119
1120                                 memset(&cb, 0, sizeof(cb));
1121                                 cb.cont = auth_cram_md5;
1122                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1123                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1124                                         goto bail;
1125                                 }
1126                         } else {
1127                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1128                                 goto bail;
1129                         }
1130                 } else {
1131                         if (CAP(NOLOGIN)) {
1132                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1133                                         srvc->user, srvc->host);
1134                                 goto bail;
1135                         }
1136                         if (!imap->buf.sock.ssl)
1137                                 imap_warn("*** IMAP Warning *** Password is being "
1138                                           "sent in the clear\n");
1139                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1140                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1141                                 goto bail;
1142                         }
1143                 }
1144         } /* !preauth */
1145
1146         if (cred.username)
1147                 credential_approve(&cred);
1148         credential_clear(&cred);
1149
1150         /* check the target mailbox exists */
1151         ctx->name = folder;
1152         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1153         case RESP_OK:
1154                 /* ok */
1155                 break;
1156         case RESP_BAD:
1157                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1158                 goto out;
1159         case RESP_NO:
1160                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1161                         imap_info("Created missing mailbox\n");
1162                 } else {
1163                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1164                         goto out;
1165                 }
1166                 break;
1167         }
1168
1169         ctx->prefix = "";
1170         return ctx;
1171
1172 bail:
1173         if (cred.username)
1174                 credential_reject(&cred);
1175         credential_clear(&cred);
1176
1177  out:
1178         imap_close_store(ctx);
1179         return NULL;
1180 }
1181
1182 /*
1183  * Insert CR characters as necessary in *msg to ensure that every LF
1184  * character in *msg is preceded by a CR.
1185  */
1186 static void lf_to_crlf(struct strbuf *msg)
1187 {
1188         char *new_msg;
1189         size_t i, j;
1190         char lastc;
1191
1192         /* First pass: tally, in j, the size of the new_msg string: */
1193         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1194                 if (msg->buf[i] == '\n' && lastc != '\r')
1195                         j++; /* a CR will need to be added here */
1196                 lastc = msg->buf[i];
1197                 j++;
1198         }
1199
1200         new_msg = xmallocz(j);
1201
1202         /*
1203          * Second pass: write the new_msg string.  Note that this loop is
1204          * otherwise identical to the first pass.
1205          */
1206         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1207                 if (msg->buf[i] == '\n' && lastc != '\r')
1208                         new_msg[j++] = '\r';
1209                 lastc = new_msg[j++] = msg->buf[i];
1210         }
1211         strbuf_attach(msg, new_msg, j, j + 1);
1212 }
1213
1214 /*
1215  * Store msg to IMAP.  Also detach and free the data from msg->data,
1216  * leaving msg->data empty.
1217  */
1218 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1219 {
1220         struct imap *imap = ctx->imap;
1221         struct imap_cmd_cb cb;
1222         const char *prefix, *box;
1223         int ret;
1224
1225         lf_to_crlf(msg);
1226         memset(&cb, 0, sizeof(cb));
1227
1228         cb.dlen = msg->len;
1229         cb.data = strbuf_detach(msg, NULL);
1230
1231         box = ctx->name;
1232         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1233         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1234         imap->caps = imap->rcaps;
1235         if (ret != DRV_OK)
1236                 return ret;
1237
1238         return DRV_OK;
1239 }
1240
1241 static void wrap_in_html(struct strbuf *msg)
1242 {
1243         struct strbuf buf = STRBUF_INIT;
1244         static char *content_type = "Content-Type: text/html;\n";
1245         static char *pre_open = "<pre>\n";
1246         static char *pre_close = "</pre>\n";
1247         const char *body = strstr(msg->buf, "\n\n");
1248
1249         if (!body)
1250                 return; /* Headers but no body; no wrapping needed */
1251
1252         body += 2;
1253
1254         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1255         strbuf_addstr(&buf, content_type);
1256         strbuf_addch(&buf, '\n');
1257         strbuf_addstr(&buf, pre_open);
1258         strbuf_addstr_xml_quoted(&buf, body);
1259         strbuf_addstr(&buf, pre_close);
1260
1261         strbuf_release(msg);
1262         *msg = buf;
1263 }
1264
1265 static int count_messages(struct strbuf *all_msgs)
1266 {
1267         int count = 0;
1268         char *p = all_msgs->buf;
1269
1270         while (1) {
1271                 if (starts_with(p, "From ")) {
1272                         p = strstr(p+5, "\nFrom: ");
1273                         if (!p) break;
1274                         p = strstr(p+7, "\nDate: ");
1275                         if (!p) break;
1276                         p = strstr(p+7, "\nSubject: ");
1277                         if (!p) break;
1278                         p += 10;
1279                         count++;
1280                 }
1281                 p = strstr(p+5, "\nFrom ");
1282                 if (!p)
1283                         break;
1284                 p++;
1285         }
1286         return count;
1287 }
1288
1289 /*
1290  * Copy the next message from all_msgs, starting at offset *ofs, to
1291  * msg.  Update *ofs to the start of the following message.  Return
1292  * true iff a message was successfully copied.
1293  */
1294 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1295 {
1296         char *p, *data;
1297         size_t len;
1298
1299         if (*ofs >= all_msgs->len)
1300                 return 0;
1301
1302         data = &all_msgs->buf[*ofs];
1303         len = all_msgs->len - *ofs;
1304
1305         if (len < 5 || !starts_with(data, "From "))
1306                 return 0;
1307
1308         p = strchr(data, '\n');
1309         if (p) {
1310                 p++;
1311                 len -= p - data;
1312                 *ofs += p - data;
1313                 data = p;
1314         }
1315
1316         p = strstr(data, "\nFrom ");
1317         if (p)
1318                 len = &p[1] - data;
1319
1320         strbuf_add(msg, data, len);
1321         *ofs += len;
1322         return 1;
1323 }
1324
1325 static int git_imap_config(const char *var, const char *val,
1326                            const struct config_context *ctx, void *cb)
1327 {
1328
1329         if (!strcmp("imap.sslverify", var))
1330                 server.ssl_verify = git_config_bool(var, val);
1331         else if (!strcmp("imap.preformattedhtml", var))
1332                 server.use_html = git_config_bool(var, val);
1333         else if (!strcmp("imap.folder", var))
1334                 return git_config_string(&server.folder, var, val);
1335         else if (!strcmp("imap.user", var))
1336                 return git_config_string(&server.user, var, val);
1337         else if (!strcmp("imap.pass", var))
1338                 return git_config_string(&server.pass, var, val);
1339         else if (!strcmp("imap.tunnel", var))
1340                 return git_config_string(&server.tunnel, var, val);
1341         else if (!strcmp("imap.authmethod", var))
1342                 return git_config_string(&server.auth_method, var, val);
1343         else if (!strcmp("imap.port", var))
1344                 server.port = git_config_int(var, val, ctx->kvi);
1345         else if (!strcmp("imap.host", var)) {
1346                 if (!val) {
1347                         return config_error_nonbool(var);
1348                 } else {
1349                         if (starts_with(val, "imap:"))
1350                                 val += 5;
1351                         else if (starts_with(val, "imaps:")) {
1352                                 val += 6;
1353                                 server.use_ssl = 1;
1354                         }
1355                         if (starts_with(val, "//"))
1356                                 val += 2;
1357                         server.host = xstrdup(val);
1358                 }
1359         } else
1360                 return git_default_config(var, val, ctx, cb);
1361
1362         return 0;
1363 }
1364
1365 static int append_msgs_to_imap(struct imap_server_conf *server,
1366                                struct strbuf* all_msgs, int total)
1367 {
1368         struct strbuf msg = STRBUF_INIT;
1369         struct imap_store *ctx = NULL;
1370         int ofs = 0;
1371         int r;
1372         int n = 0;
1373
1374         ctx = imap_open_store(server, server->folder);
1375         if (!ctx) {
1376                 fprintf(stderr, "failed to open store\n");
1377                 return 1;
1378         }
1379         ctx->name = server->folder;
1380
1381         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1382         while (1) {
1383                 unsigned percent = n * 100 / total;
1384
1385                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1386
1387                 if (!split_msg(all_msgs, &msg, &ofs))
1388                         break;
1389                 if (server->use_html)
1390                         wrap_in_html(&msg);
1391                 r = imap_store_msg(ctx, &msg);
1392                 if (r != DRV_OK)
1393                         break;
1394                 n++;
1395         }
1396         fprintf(stderr, "\n");
1397
1398         imap_close_store(ctx);
1399
1400         return 0;
1401 }
1402
1403 #ifdef USE_CURL_FOR_IMAP_SEND
1404 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1405 {
1406         CURL *curl;
1407         struct strbuf path = STRBUF_INIT;
1408         char *uri_encoded_folder;
1409
1410         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1411                 die("curl_global_init failed");
1412
1413         curl = curl_easy_init();
1414
1415         if (!curl)
1416                 die("curl_easy_init failed");
1417
1418         server_fill_credential(srvc, cred);
1419         curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
1420         curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
1421
1422         strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
1423         strbuf_addstr(&path, srvc->host);
1424         if (!path.len || path.buf[path.len - 1] != '/')
1425                 strbuf_addch(&path, '/');
1426
1427         uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
1428         if (!uri_encoded_folder)
1429                 die("failed to encode server folder");
1430         strbuf_addstr(&path, uri_encoded_folder);
1431         curl_free(uri_encoded_folder);
1432
1433         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1434         strbuf_release(&path);
1435         curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
1436
1437         if (srvc->auth_method) {
1438 #ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
1439                 warning("No LOGIN_OPTIONS support in this cURL version");
1440 #else
1441                 struct strbuf auth = STRBUF_INIT;
1442                 strbuf_addstr(&auth, "AUTH=");
1443                 strbuf_addstr(&auth, srvc->auth_method);
1444                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1445                 strbuf_release(&auth);
1446 #endif
1447         }
1448
1449         if (!srvc->use_ssl)
1450                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1451
1452         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
1453         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
1454
1455         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1456
1457         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1458
1459         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1460                 http_trace_curl_no_data();
1461         setup_curl_trace(curl);
1462
1463         return curl;
1464 }
1465
1466 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1467                                     struct strbuf* all_msgs, int total)
1468 {
1469         int ofs = 0;
1470         int n = 0;
1471         struct buffer msgbuf = { STRBUF_INIT, 0 };
1472         CURL *curl;
1473         CURLcode res = CURLE_OK;
1474         struct credential cred = CREDENTIAL_INIT;
1475
1476         curl = setup_curl(server, &cred);
1477         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1478
1479         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1480         while (1) {
1481                 unsigned percent = n * 100 / total;
1482                 int prev_len;
1483
1484                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1485
1486                 prev_len = msgbuf.buf.len;
1487                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1488                         break;
1489                 if (server->use_html)
1490                         wrap_in_html(&msgbuf.buf);
1491                 lf_to_crlf(&msgbuf.buf);
1492
1493                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1494                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1495
1496                 res = curl_easy_perform(curl);
1497
1498                 if(res != CURLE_OK) {
1499                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1500                                         curl_easy_strerror(res));
1501                         break;
1502                 }
1503
1504                 n++;
1505         }
1506         fprintf(stderr, "\n");
1507
1508         curl_easy_cleanup(curl);
1509         curl_global_cleanup();
1510
1511         if (cred.username) {
1512                 if (res == CURLE_OK)
1513                         credential_approve(&cred);
1514                 else if (res == CURLE_LOGIN_DENIED)
1515                         credential_reject(&cred);
1516         }
1517
1518         credential_clear(&cred);
1519
1520         return res != CURLE_OK;
1521 }
1522 #endif
1523
1524 int cmd_main(int argc, const char **argv)
1525 {
1526         struct strbuf all_msgs = STRBUF_INIT;
1527         int total;
1528         int nongit_ok;
1529
1530         setup_git_directory_gently(&nongit_ok);
1531         git_config(git_imap_config, NULL);
1532
1533         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1534
1535         if (argc)
1536                 usage_with_options(imap_send_usage, imap_send_options);
1537
1538 #ifndef USE_CURL_FOR_IMAP_SEND
1539         if (use_curl) {
1540                 warning("--curl not supported in this build");
1541                 use_curl = 0;
1542         }
1543 #elif defined(NO_OPENSSL)
1544         if (!use_curl) {
1545                 warning("--no-curl not supported in this build");
1546                 use_curl = 1;
1547         }
1548 #endif
1549
1550         if (!server.port)
1551                 server.port = server.use_ssl ? 993 : 143;
1552
1553         if (!server.folder) {
1554                 fprintf(stderr, "no imap store specified\n");
1555                 return 1;
1556         }
1557         if (!server.host) {
1558                 if (!server.tunnel) {
1559                         fprintf(stderr, "no imap host specified\n");
1560                         return 1;
1561                 }
1562                 server.host = "tunnel";
1563         }
1564
1565         /* read the messages */
1566         if (strbuf_read(&all_msgs, 0, 0) < 0) {
1567                 error_errno(_("could not read from stdin"));
1568                 return 1;
1569         }
1570
1571         if (all_msgs.len == 0) {
1572                 fprintf(stderr, "nothing to send\n");
1573                 return 1;
1574         }
1575
1576         total = count_messages(&all_msgs);
1577         if (!total) {
1578                 fprintf(stderr, "no messages to send\n");
1579                 return 1;
1580         }
1581
1582         /* write it to the imap server */
1583
1584         if (server.tunnel)
1585                 return append_msgs_to_imap(&server, &all_msgs, total);
1586
1587 #ifdef USE_CURL_FOR_IMAP_SEND
1588         if (use_curl)
1589                 return curl_append_msgs_to_imap(&server, &all_msgs, total);
1590 #endif
1591
1592         return append_msgs_to_imap(&server, &all_msgs, total);
1593 }