imap-send.c

   1 /*
   2  * git-imap-send - drops patches into an imap Drafts folder
   3  *                 derived from isync/mbsync - mailbox synchronizer
   4  *
   5  * Copyright (C) 2000-2002 Michael R. Elkins <me@mutt.org>
   6  * Copyright (C) 2002-2004 Oswald Buddenhagen <ossi@users.sf.net>
   7  * Copyright (C) 2004 Theodore Y. Ts'o <tytso@mit.edu>
   8  * Copyright (C) 2006 Mike McCormack
   9  *
  10  *  This program is free software; you can redistribute it and/or modify
  11  *  it under the terms of the GNU General Public License as published by
  12  *  the Free Software Foundation; either version 2 of the License, or
  13  *  (at your option) any later version.
  14  *
  15  *  This program is distributed in the hope that it will be useful,
  16  *  but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *  GNU General Public License for more details.
  19  *
  20  *  You should have received a copy of the GNU General Public License
  21  *  along with this program; if not, see <https://www.gnu.org/licenses/>.
  22  */
  23
  24 #define USE_THE_REPOSITORY_VARIABLE
  25
  26 #include "git-compat-util.h"
  27 #include "config.h"
  28 #include "credential.h"
  29 #include "gettext.h"
  30 #include "run-command.h"
  31 #include "parse-options.h"
  32 #include "setup.h"
  33 #include "strbuf.h"
  34 #if defined(NO_OPENSSL) && !defined(HAVE_OPENSSL_CSPRNG)
  35 typedef void *SSL;
  36 #endif
  37 #ifdef USE_CURL_FOR_IMAP_SEND
  38 #include "http.h"
  39 #endif
  40
  41 #if defined(USE_CURL_FOR_IMAP_SEND)
  42 /* Always default to curl if it's available. */
  43 #define USE_CURL_DEFAULT 1
  44 #else
  45 /* We don't have curl, so continue to use the historical implementation */
  46 #define USE_CURL_DEFAULT 0
  47 #endif
  48
  49 static int verbosity;
  50 static int use_curl = USE_CURL_DEFAULT;
  51
  52 static const char * const imap_send_usage[] = { "git imap-send [-v] [-q] [--[no-]curl] < <mbox>", NULL };
  53
  54 static struct option imap_send_options[] = {
  55         OPT__VERBOSITY(&verbosity),
  56         OPT_BOOL(0, "curl", &use_curl, "use libcurl to communicate with the IMAP server"),
  57         OPT_END()
  58 };
  59
  60 #undef DRV_OK
  61 #define DRV_OK          0
  62 #define DRV_MSG_BAD     -1
  63 #define DRV_BOX_BAD     -2
  64 #define DRV_STORE_BAD   -3
  65
  66 __attribute__((format (printf, 1, 2)))
  67 static void imap_info(const char *, ...);
  68 __attribute__((format (printf, 1, 2)))
  69 static void imap_warn(const char *, ...);
  70
  71 static char *next_arg(char **);
  72
  73 struct imap_server_conf {
  74         char *tunnel;
  75         char *host;
  76         int port;
  77         char *folder;
  78         char *user;
  79         char *pass;
  80         int use_ssl;
  81         int ssl_verify;
  82         int use_html;
  83         char *auth_method;
  84 };
  85
  86 struct imap_socket {
  87         int fd[2];
  88         SSL *ssl;
  89 };
  90
  91 struct imap_buffer {
  92         struct imap_socket sock;
  93         int bytes;
  94         int offset;
  95         char buf[1024];
  96 };
  97
  98 struct imap_cmd;
  99
 100 struct imap {
 101         int uidnext; /* from SELECT responses */
 102         unsigned caps, rcaps; /* CAPABILITY results */
 103         /* command queue */
 104         int nexttag, num_in_progress, literal_pending;
 105         struct imap_cmd *in_progress, **in_progress_append;
 106         struct imap_buffer buf; /* this is BIG, so put it last */
 107 };
 108
 109 struct imap_store {
 110         const struct imap_server_conf *cfg;
 111         /* currently open mailbox */
 112         const char *name; /* foreign! maybe preset? */
 113         int uidvalidity;
 114         struct imap *imap;
 115         const char *prefix;
 116 };
 117
 118 struct imap_cmd_cb {
 119         int (*cont)(struct imap_store *ctx, const char *prompt);
 120         void *ctx;
 121         char *data;
 122         int dlen;
 123 };
 124
 125 struct imap_cmd {
 126         struct imap_cmd *next;
 127         struct imap_cmd_cb cb;
 128         char *cmd;
 129         int tag;
 130 };
 131
 132 #define CAP(cap) (imap->caps & (1 << (cap)))
 133
 134 enum CAPABILITY {
 135         NOLOGIN = 0,
 136         UIDPLUS,
 137         LITERALPLUS,
 138         NAMESPACE,
 139         STARTTLS,
 140         AUTH_CRAM_MD5
 141 };
 142
 143 static const char *cap_list[] = {
 144         "LOGINDISABLED",
 145         "UIDPLUS",
 146         "LITERAL+",
 147         "NAMESPACE",
 148         "STARTTLS",
 149         "AUTH=CRAM-MD5",
 150 };
 151
 152 #define RESP_OK    0
 153 #define RESP_NO    1
 154 #define RESP_BAD   2
 155
 156 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd);
 157
 158
 159 #ifndef NO_OPENSSL
 160 static void ssl_socket_perror(const char *func)
 161 {
 162         fprintf(stderr, "%s: %s\n", func, ERR_error_string(ERR_get_error(), NULL));
 163 }
 164 #endif
 165
 166 static void socket_perror(const char *func, struct imap_socket *sock, int ret)
 167 {
 168 #ifndef NO_OPENSSL
 169         if (sock->ssl) {
 170                 int sslerr = SSL_get_error(sock->ssl, ret);
 171                 switch (sslerr) {
 172                 case SSL_ERROR_NONE:
 173                         break;
 174                 case SSL_ERROR_SYSCALL:
 175                         perror("SSL_connect");
 176                         break;
 177                 default:
 178                         ssl_socket_perror("SSL_connect");
 179                         break;
 180                 }
 181         } else
 182 #endif
 183         {
 184                 if (ret < 0)
 185                         perror(func);
 186                 else
 187                         fprintf(stderr, "%s: unexpected EOF\n", func);
 188         }
 189         /* mark as used to appease -Wunused-parameter with NO_OPENSSL */
 190         (void)sock;
 191 }
 192
 193 #ifdef NO_OPENSSL
 194 static int ssl_socket_connect(struct imap_socket *sock UNUSED,
 195                               const struct imap_server_conf *cfg UNUSED,
 196                               int use_tls_only UNUSED)
 197 {
 198         fprintf(stderr, "SSL requested but SSL support not compiled in\n");
 199         return -1;
 200 }
 201
 202 #else
 203
 204 static int host_matches(const char *host, const char *pattern)
 205 {
 206         if (pattern[0] == '*' && pattern[1] == '.') {
 207                 pattern += 2;
 208                 if (!(host = strchr(host, '.')))
 209                         return 0;
 210                 host++;
 211         }
 212
 213         return *host && *pattern && !strcasecmp(host, pattern);
 214 }
 215
 216 static int verify_hostname(X509 *cert, const char *hostname)
 217 {
 218         int len;
 219         X509_NAME *subj;
 220         char cname[1000];
 221         int i, found;
 222         STACK_OF(GENERAL_NAME) *subj_alt_names;
 223
 224         /* try the DNS subjectAltNames */
 225         found = 0;
 226         if ((subj_alt_names = X509_get_ext_d2i(cert, NID_subject_alt_name, NULL, NULL))) {
 227                 int num_subj_alt_names = sk_GENERAL_NAME_num(subj_alt_names);
 228                 for (i = 0; !found && i < num_subj_alt_names; i++) {
 229                         GENERAL_NAME *subj_alt_name = sk_GENERAL_NAME_value(subj_alt_names, i);
 230                         if (subj_alt_name->type == GEN_DNS &&
 231                             strlen((const char *)subj_alt_name->d.ia5->data) == (size_t)subj_alt_name->d.ia5->length &&
 232                             host_matches(hostname, (const char *)(subj_alt_name->d.ia5->data)))
 233                                 found = 1;
 234                 }
 235                 sk_GENERAL_NAME_pop_free(subj_alt_names, GENERAL_NAME_free);
 236         }
 237         if (found)
 238                 return 0;
 239
 240         /* try the common name */
 241         if (!(subj = X509_get_subject_name(cert)))
 242                 return error("cannot get certificate subject");
 243         if ((len = X509_NAME_get_text_by_NID(subj, NID_commonName, cname, sizeof(cname))) < 0)
 244                 return error("cannot get certificate common name");
 245         if (strlen(cname) == (size_t)len && host_matches(hostname, cname))
 246                 return 0;
 247         return error("certificate owner '%s' does not match hostname '%s'",
 248                      cname, hostname);
 249 }
 250
 251 static int ssl_socket_connect(struct imap_socket *sock,
 252                               const struct imap_server_conf *cfg,
 253                               int use_tls_only)
 254 {
 255 #if (OPENSSL_VERSION_NUMBER >= 0x10000000L)
 256         const SSL_METHOD *meth;
 257 #else
 258         SSL_METHOD *meth;
 259 #endif
 260         SSL_CTX *ctx;
 261         int ret;
 262         X509 *cert;
 263
 264         SSL_library_init();
 265         SSL_load_error_strings();
 266
 267         meth = SSLv23_method();
 268         if (!meth) {
 269                 ssl_socket_perror("SSLv23_method");
 270                 return -1;
 271         }
 272
 273         ctx = SSL_CTX_new(meth);
 274         if (!ctx) {
 275                 ssl_socket_perror("SSL_CTX_new");
 276                 return -1;
 277         }
 278
 279         if (use_tls_only)
 280                 SSL_CTX_set_options(ctx, SSL_OP_NO_SSLv2 | SSL_OP_NO_SSLv3);
 281
 282         if (cfg->ssl_verify)
 283                 SSL_CTX_set_verify(ctx, SSL_VERIFY_PEER, NULL);
 284
 285         if (!SSL_CTX_set_default_verify_paths(ctx)) {
 286                 ssl_socket_perror("SSL_CTX_set_default_verify_paths");
 287                 return -1;
 288         }
 289         sock->ssl = SSL_new(ctx);
 290         if (!sock->ssl) {
 291                 ssl_socket_perror("SSL_new");
 292                 return -1;
 293         }
 294         if (!SSL_set_rfd(sock->ssl, sock->fd[0])) {
 295                 ssl_socket_perror("SSL_set_rfd");
 296                 return -1;
 297         }
 298         if (!SSL_set_wfd(sock->ssl, sock->fd[1])) {
 299                 ssl_socket_perror("SSL_set_wfd");
 300                 return -1;
 301         }
 302
 303 #ifdef SSL_CTRL_SET_TLSEXT_HOSTNAME
 304         /*
 305          * SNI (RFC4366)
 306          * OpenSSL does not document this function, but the implementation
 307          * returns 1 on success, 0 on failure after calling SSLerr().
 308          */
 309         ret = SSL_set_tlsext_host_name(sock->ssl, cfg->host);
 310         if (ret != 1)
 311                 warning("SSL_set_tlsext_host_name(%s) failed.", cfg->host);
 312 #endif
 313
 314         ret = SSL_connect(sock->ssl);
 315         if (ret <= 0) {
 316                 socket_perror("SSL_connect", sock, ret);
 317                 return -1;
 318         }
 319
 320         if (cfg->ssl_verify) {
 321                 /* make sure the hostname matches that of the certificate */
 322                 cert = SSL_get_peer_certificate(sock->ssl);
 323                 if (!cert)
 324                         return error("unable to get peer certificate.");
 325                 if (verify_hostname(cert, cfg->host) < 0)
 326                         return -1;
 327         }
 328
 329         return 0;
 330 }
 331 #endif
 332
 333 static int socket_read(struct imap_socket *sock, char *buf, int len)
 334 {
 335         ssize_t n;
 336 #ifndef NO_OPENSSL
 337         if (sock->ssl)
 338                 n = SSL_read(sock->ssl, buf, len);
 339         else
 340 #endif
 341                 n = xread(sock->fd[0], buf, len);
 342         if (n <= 0) {
 343                 socket_perror("read", sock, n);
 344                 close(sock->fd[0]);
 345                 close(sock->fd[1]);
 346                 sock->fd[0] = sock->fd[1] = -1;
 347         }
 348         return n;
 349 }
 350
 351 static int socket_write(struct imap_socket *sock, const char *buf, int len)
 352 {
 353         int n;
 354 #ifndef NO_OPENSSL
 355         if (sock->ssl)
 356                 n = SSL_write(sock->ssl, buf, len);
 357         else
 358 #endif
 359                 n = write_in_full(sock->fd[1], buf, len);
 360         if (n != len) {
 361                 socket_perror("write", sock, n);
 362                 close(sock->fd[0]);
 363                 close(sock->fd[1]);
 364                 sock->fd[0] = sock->fd[1] = -1;
 365         }
 366         return n;
 367 }
 368
 369 static void socket_shutdown(struct imap_socket *sock)
 370 {
 371 #ifndef NO_OPENSSL
 372         if (sock->ssl) {
 373                 SSL_shutdown(sock->ssl);
 374                 SSL_free(sock->ssl);
 375         }
 376 #endif
 377         close(sock->fd[0]);
 378         close(sock->fd[1]);
 379 }
 380
 381 /* simple line buffering */
 382 static int buffer_gets(struct imap_buffer *b, char **s)
 383 {
 384         int n;
 385         int start = b->offset;
 386
 387         *s = b->buf + start;
 388
 389         for (;;) {
 390                 /* make sure we have enough data to read the \r\n sequence */
 391                 if (b->offset + 1 >= b->bytes) {
 392                         if (start) {
 393                                 /* shift down used bytes */
 394                                 *s = b->buf;
 395
 396                                 assert(start <= b->bytes);
 397                                 n = b->bytes - start;
 398
 399                                 if (n)
 400                                         memmove(b->buf, b->buf + start, n);
 401                                 b->offset -= start;
 402                                 b->bytes = n;
 403                                 start = 0;
 404                         }
 405
 406                         n = socket_read(&b->sock, b->buf + b->bytes,
 407                                          sizeof(b->buf) - b->bytes);
 408
 409                         if (n <= 0)
 410                                 return -1;
 411
 412                         b->bytes += n;
 413                 }
 414
 415                 if (b->buf[b->offset] == '\r') {
 416                         assert(b->offset + 1 < b->bytes);
 417                         if (b->buf[b->offset + 1] == '\n') {
 418                                 b->buf[b->offset] = 0;  /* terminate the string */
 419                                 b->offset += 2; /* next line */
 420                                 if (0 < verbosity)
 421                                         puts(*s);
 422                                 return 0;
 423                         }
 424                 }
 425
 426                 b->offset++;
 427         }
 428         /* not reached */
 429 }
 430
 431 __attribute__((format (printf, 1, 2)))
 432 static void imap_info(const char *msg, ...)
 433 {
 434         va_list va;
 435
 436         if (0 <= verbosity) {
 437                 va_start(va, msg);
 438                 vprintf(msg, va);
 439                 va_end(va);
 440                 fflush(stdout);
 441         }
 442 }
 443
 444 __attribute__((format (printf, 1, 2)))
 445 static void imap_warn(const char *msg, ...)
 446 {
 447         va_list va;
 448
 449         if (-2 < verbosity) {
 450                 va_start(va, msg);
 451                 vfprintf(stderr, msg, va);
 452                 va_end(va);
 453         }
 454 }
 455
 456 static char *next_arg(char **s)
 457 {
 458         char *ret;
 459
 460         if (!s || !*s)
 461                 return NULL;
 462         while (isspace((unsigned char) **s))
 463                 (*s)++;
 464         if (!**s) {
 465                 *s = NULL;
 466                 return NULL;
 467         }
 468         if (**s == '"') {
 469                 ++*s;
 470                 ret = *s;
 471                 *s = strchr(*s, '"');
 472         } else {
 473                 ret = *s;
 474                 while (**s && !isspace((unsigned char) **s))
 475                         (*s)++;
 476         }
 477         if (*s) {
 478                 if (**s)
 479                         *(*s)++ = 0;
 480                 if (!**s)
 481                         *s = NULL;
 482         }
 483         return ret;
 484 }
 485
 486 static struct imap_cmd *issue_imap_cmd(struct imap_store *ctx,
 487                                        struct imap_cmd_cb *cb,
 488                                        const char *fmt, va_list ap)
 489 {
 490         struct imap *imap = ctx->imap;
 491         struct imap_cmd *cmd;
 492         int n;
 493         struct strbuf buf = STRBUF_INIT;
 494
 495         cmd = xmalloc(sizeof(struct imap_cmd));
 496         cmd->cmd = xstrvfmt(fmt, ap);
 497         cmd->tag = ++imap->nexttag;
 498
 499         if (cb)
 500                 cmd->cb = *cb;
 501         else
 502                 memset(&cmd->cb, 0, sizeof(cmd->cb));
 503
 504         while (imap->literal_pending)
 505                 get_cmd_result(ctx, NULL);
 506
 507         if (!cmd->cb.data)
 508                 strbuf_addf(&buf, "%d %s\r\n", cmd->tag, cmd->cmd);
 509         else
 510                 strbuf_addf(&buf, "%d %s{%d%s}\r\n", cmd->tag, cmd->cmd,
 511                             cmd->cb.dlen, CAP(LITERALPLUS) ? "+" : "");
 512         if (buf.len > INT_MAX)
 513                 die("imap command overflow!");
 514
 515         if (0 < verbosity) {
 516                 if (imap->num_in_progress)
 517                         printf("(%d in progress) ", imap->num_in_progress);
 518                 if (!starts_with(cmd->cmd, "LOGIN"))
 519                         printf(">>> %s", buf.buf);
 520                 else
 521                         printf(">>> %d LOGIN <user> <pass>\n", cmd->tag);
 522         }
 523         if (socket_write(&imap->buf.sock, buf.buf, buf.len) != buf.len) {
 524                 free(cmd->cmd);
 525                 free(cmd);
 526                 if (cb)
 527                         free(cb->data);
 528                 strbuf_release(&buf);
 529                 return NULL;
 530         }
 531         strbuf_release(&buf);
 532         if (cmd->cb.data) {
 533                 if (CAP(LITERALPLUS)) {
 534                         n = socket_write(&imap->buf.sock, cmd->cb.data, cmd->cb.dlen);
 535                         free(cmd->cb.data);
 536                         if (n != cmd->cb.dlen ||
 537                             socket_write(&imap->buf.sock, "\r\n", 2) != 2) {
 538                                 free(cmd->cmd);
 539                                 free(cmd);
 540                                 return NULL;
 541                         }
 542                         cmd->cb.data = NULL;
 543                 } else
 544                         imap->literal_pending = 1;
 545         } else if (cmd->cb.cont)
 546                 imap->literal_pending = 1;
 547         cmd->next = NULL;
 548         *imap->in_progress_append = cmd;
 549         imap->in_progress_append = &cmd->next;
 550         imap->num_in_progress++;
 551         return cmd;
 552 }
 553
 554 __attribute__((format (printf, 3, 4)))
 555 static int imap_exec(struct imap_store *ctx, struct imap_cmd_cb *cb,
 556                      const char *fmt, ...)
 557 {
 558         va_list ap;
 559         struct imap_cmd *cmdp;
 560
 561         va_start(ap, fmt);
 562         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 563         va_end(ap);
 564         if (!cmdp)
 565                 return RESP_BAD;
 566
 567         return get_cmd_result(ctx, cmdp);
 568 }
 569
 570 __attribute__((format (printf, 3, 4)))
 571 static int imap_exec_m(struct imap_store *ctx, struct imap_cmd_cb *cb,
 572                        const char *fmt, ...)
 573 {
 574         va_list ap;
 575         struct imap_cmd *cmdp;
 576
 577         va_start(ap, fmt);
 578         cmdp = issue_imap_cmd(ctx, cb, fmt, ap);
 579         va_end(ap);
 580         if (!cmdp)
 581                 return DRV_STORE_BAD;
 582
 583         switch (get_cmd_result(ctx, cmdp)) {
 584         case RESP_BAD: return DRV_STORE_BAD;
 585         case RESP_NO: return DRV_MSG_BAD;
 586         default: return DRV_OK;
 587         }
 588 }
 589
 590 static int skip_imap_list_l(char **sp, int level)
 591 {
 592         char *s = *sp;
 593
 594         for (;;) {
 595                 while (isspace((unsigned char)*s))
 596                         s++;
 597                 if (level && *s == ')') {
 598                         s++;
 599                         break;
 600                 }
 601                 if (*s == '(') {
 602                         /* sublist */
 603                         s++;
 604                         if (skip_imap_list_l(&s, level + 1))
 605                                 goto bail;
 606                 } else if (*s == '"') {
 607                         /* quoted string */
 608                         s++;
 609                         for (; *s != '"'; s++)
 610                                 if (!*s)
 611                                         goto bail;
 612                         s++;
 613                 } else {
 614                         /* atom */
 615                         for (; *s && !isspace((unsigned char)*s); s++)
 616                                 if (level && *s == ')')
 617                                         break;
 618                 }
 619
 620                 if (!level)
 621                         break;
 622                 if (!*s)
 623                         goto bail;
 624         }
 625         *sp = s;
 626         return 0;
 627
 628 bail:
 629         return -1;
 630 }
 631
 632 static void skip_list(char **sp)
 633 {
 634         skip_imap_list_l(sp, 0);
 635 }
 636
 637 static void parse_capability(struct imap *imap, char *cmd)
 638 {
 639         char *arg;
 640         unsigned i;
 641
 642         imap->caps = 0x80000000;
 643         while ((arg = next_arg(&cmd)))
 644                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 645                         if (!strcmp(cap_list[i], arg))
 646                                 imap->caps |= 1 << i;
 647         imap->rcaps = imap->caps;
 648 }
 649
 650 static int parse_response_code(struct imap_store *ctx, struct imap_cmd_cb *cb,
 651                                char *s)
 652 {
 653         struct imap *imap = ctx->imap;
 654         char *arg, *p;
 655
 656         if (!s || *s != '[')
 657                 return RESP_OK;         /* no response code */
 658         s++;
 659         if (!(p = strchr(s, ']'))) {
 660                 fprintf(stderr, "IMAP error: malformed response code\n");
 661                 return RESP_BAD;
 662         }
 663         *p++ = 0;
 664         arg = next_arg(&s);
 665         if (!arg) {
 666                 fprintf(stderr, "IMAP error: empty response code\n");
 667                 return RESP_BAD;
 668         }
 669         if (!strcmp("UIDVALIDITY", arg)) {
 670                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg))) {
 671                         fprintf(stderr, "IMAP error: malformed UIDVALIDITY status\n");
 672                         return RESP_BAD;
 673                 }
 674         } else if (!strcmp("UIDNEXT", arg)) {
 675                 if (!(arg = next_arg(&s)) || !(imap->uidnext = atoi(arg))) {
 676                         fprintf(stderr, "IMAP error: malformed NEXTUID status\n");
 677                         return RESP_BAD;
 678                 }
 679         } else if (!strcmp("CAPABILITY", arg)) {
 680                 parse_capability(imap, s);
 681         } else if (!strcmp("ALERT", arg)) {
 682                 /* RFC2060 says that these messages MUST be displayed
 683                  * to the user
 684                  */
 685                 for (; isspace((unsigned char)*p); p++);
 686                 fprintf(stderr, "*** IMAP ALERT *** %s\n", p);
 687         } else if (cb && cb->ctx && !strcmp("APPENDUID", arg)) {
 688                 if (!(arg = next_arg(&s)) || !(ctx->uidvalidity = atoi(arg)) ||
 689                     !(arg = next_arg(&s)) || !(*(int *)cb->ctx = atoi(arg))) {
 690                         fprintf(stderr, "IMAP error: malformed APPENDUID status\n");
 691                         return RESP_BAD;
 692                 }
 693         }
 694         return RESP_OK;
 695 }
 696
 697 static int get_cmd_result(struct imap_store *ctx, struct imap_cmd *tcmd)
 698 {
 699         struct imap *imap = ctx->imap;
 700         struct imap_cmd *cmdp, **pcmdp;
 701         char *cmd;
 702         const char *arg, *arg1;
 703         int n, resp, resp2, tag;
 704
 705         for (;;) {
 706                 if (buffer_gets(&imap->buf, &cmd))
 707                         return RESP_BAD;
 708
 709                 arg = next_arg(&cmd);
 710                 if (!arg) {
 711                         fprintf(stderr, "IMAP error: empty response\n");
 712                         return RESP_BAD;
 713                 }
 714                 if (*arg == '*') {
 715                         arg = next_arg(&cmd);
 716                         if (!arg) {
 717                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 718                                 return RESP_BAD;
 719                         }
 720
 721                         if (!strcmp("NAMESPACE", arg)) {
 722                                 /* rfc2342 NAMESPACE response. */
 723                                 skip_list(&cmd); /* Personal mailboxes */
 724                                 skip_list(&cmd); /* Others' mailboxes */
 725                                 skip_list(&cmd); /* Shared mailboxes */
 726                         } else if (!strcmp("OK", arg) || !strcmp("BAD", arg) ||
 727                                    !strcmp("NO", arg) || !strcmp("BYE", arg)) {
 728                                 if ((resp = parse_response_code(ctx, NULL, cmd)) != RESP_OK)
 729                                         return resp;
 730                         } else if (!strcmp("CAPABILITY", arg)) {
 731                                 parse_capability(imap, cmd);
 732                         } else if ((arg1 = next_arg(&cmd))) {
 733                                 ; /*
 734                                    * Unhandled response-data with at least two words.
 735                                    * Ignore it.
 736                                    *
 737                                    * NEEDSWORK: Previously this case handled '<num> EXISTS'
 738                                    * and '<num> RECENT' but as a probably-unintended side
 739                                    * effect it ignores other unrecognized two-word
 740                                    * responses.  imap-send doesn't ever try to read
 741                                    * messages or mailboxes these days, so consider
 742                                    * eliminating this case.
 743                                    */
 744                         } else {
 745                                 fprintf(stderr, "IMAP error: unable to parse untagged response\n");
 746                                 return RESP_BAD;
 747                         }
 748                 } else if (!imap->in_progress) {
 749                         fprintf(stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "");
 750                         return RESP_BAD;
 751                 } else if (*arg == '+') {
 752                         /* This can happen only with the last command underway, as
 753                            it enforces a round-trip. */
 754                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 755                                offsetof(struct imap_cmd, next));
 756                         if (cmdp->cb.data) {
 757                                 n = socket_write(&imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen);
 758                                 FREE_AND_NULL(cmdp->cb.data);
 759                                 if (n != (int)cmdp->cb.dlen)
 760                                         return RESP_BAD;
 761                         } else if (cmdp->cb.cont) {
 762                                 if (cmdp->cb.cont(ctx, cmd))
 763                                         return RESP_BAD;
 764                         } else {
 765                                 fprintf(stderr, "IMAP error: unexpected command continuation request\n");
 766                                 return RESP_BAD;
 767                         }
 768                         if (socket_write(&imap->buf.sock, "\r\n", 2) != 2)
 769                                 return RESP_BAD;
 770                         if (!cmdp->cb.cont)
 771                                 imap->literal_pending = 0;
 772                         if (!tcmd)
 773                                 return DRV_OK;
 774                 } else {
 775                         tag = atoi(arg);
 776                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 777                                 if (cmdp->tag == tag)
 778                                         goto gottag;
 779                         fprintf(stderr, "IMAP error: unexpected tag %s\n", arg);
 780                         return RESP_BAD;
 781                 gottag:
 782                         if (!(*pcmdp = cmdp->next))
 783                                 imap->in_progress_append = pcmdp;
 784                         imap->num_in_progress--;
 785                         if (cmdp->cb.cont || cmdp->cb.data)
 786                                 imap->literal_pending = 0;
 787                         arg = next_arg(&cmd);
 788                         if (!arg)
 789                                 arg = "";
 790                         if (!strcmp("OK", arg))
 791                                 resp = DRV_OK;
 792                         else {
 793                                 if (!strcmp("NO", arg))
 794                                         resp = RESP_NO;
 795                                 else /*if (!strcmp("BAD", arg))*/
 796                                         resp = RESP_BAD;
 797                                 fprintf(stderr, "IMAP command '%s' returned response (%s) - %s\n",
 798                                         !starts_with(cmdp->cmd, "LOGIN") ?
 799                                                         cmdp->cmd : "LOGIN <user> <pass>",
 800                                                         arg, cmd ? cmd : "");
 801                         }
 802                         if ((resp2 = parse_response_code(ctx, &cmdp->cb, cmd)) > resp)
 803                                 resp = resp2;
 804                         free(cmdp->cb.data);
 805                         free(cmdp->cmd);
 806                         free(cmdp);
 807                         if (!tcmd || tcmd == cmdp)
 808                                 return resp;
 809                 }
 810         }
 811         /* not reached */
 812 }
 813
 814 static void imap_close_server(struct imap_store *ictx)
 815 {
 816         struct imap *imap = ictx->imap;
 817
 818         if (imap->buf.sock.fd[0] != -1) {
 819                 imap_exec(ictx, NULL, "LOGOUT");
 820                 socket_shutdown(&imap->buf.sock);
 821         }
 822         free(imap);
 823 }
 824
 825 static void imap_close_store(struct imap_store *ctx)
 826 {
 827         imap_close_server(ctx);
 828         free(ctx);
 829 }
 830
 831 #ifndef NO_OPENSSL
 832
 833 /*
 834  * hexchar() and cram() functions are based on the code from the isync
 835  * project (https://isync.sourceforge.io/).
 836  */
 837 static char hexchar(unsigned int b)
 838 {
 839         return b < 10 ? '0' + b : 'a' + (b - 10);
 840 }
 841
 842 #define ENCODED_SIZE(n) (4 * DIV_ROUND_UP((n), 3))
 843 static char *cram(const char *challenge_64, const char *user, const char *pass)
 844 {
 845         int i, resp_len, encoded_len, decoded_len;
 846         unsigned char hash[16];
 847         char hex[33];
 848         char *response, *response_64, *challenge;
 849
 850         /*
 851          * length of challenge_64 (i.e. base-64 encoded string) is a good
 852          * enough upper bound for challenge (decoded result).
 853          */
 854         encoded_len = strlen(challenge_64);
 855         challenge = xmalloc(encoded_len);
 856         decoded_len = EVP_DecodeBlock((unsigned char *)challenge,
 857                                       (unsigned char *)challenge_64, encoded_len);
 858         if (decoded_len < 0)
 859                 die("invalid challenge %s", challenge_64);
 860         if (!HMAC(EVP_md5(), pass, strlen(pass), (unsigned char *)challenge, decoded_len, hash, NULL))
 861                 die("HMAC error");
 862
 863         hex[32] = 0;
 864         for (i = 0; i < 16; i++) {
 865                 hex[2 * i] = hexchar((hash[i] >> 4) & 0xf);
 866                 hex[2 * i + 1] = hexchar(hash[i] & 0xf);
 867         }
 868
 869         /* response: "<user> <digest in hex>" */
 870         response = xstrfmt("%s %s", user, hex);
 871         resp_len = strlen(response);
 872
 873         response_64 = xmallocz(ENCODED_SIZE(resp_len));
 874         encoded_len = EVP_EncodeBlock((unsigned char *)response_64,
 875                                       (unsigned char *)response, resp_len);
 876         if (encoded_len < 0)
 877                 die("EVP_EncodeBlock error");
 878         return (char *)response_64;
 879 }
 880
 881 #else
 882
 883 static char *cram(const char *challenge_64 UNUSED,
 884                   const char *user UNUSED,
 885                   const char *pass UNUSED)
 886 {
 887         die("If you want to use CRAM-MD5 authenticate method, "
 888             "you have to build git-imap-send with OpenSSL library.");
 889 }
 890
 891 #endif
 892
 893 static int auth_cram_md5(struct imap_store *ctx, const char *prompt)
 894 {
 895         int ret;
 896         char *response;
 897
 898         response = cram(prompt, ctx->cfg->user, ctx->cfg->pass);
 899
 900         ret = socket_write(&ctx->imap->buf.sock, response, strlen(response));
 901         if (ret != strlen(response))
 902                 return error("IMAP error: sending response failed");
 903
 904         free(response);
 905
 906         return 0;
 907 }
 908
 909 static void server_fill_credential(struct imap_server_conf *srvc, struct credential *cred)
 910 {
 911         if (srvc->user && srvc->pass)
 912                 return;
 913
 914         cred->protocol = xstrdup(srvc->use_ssl ? "imaps" : "imap");
 915         cred->host = xstrdup(srvc->host);
 916
 917         cred->username = xstrdup_or_null(srvc->user);
 918         cred->password = xstrdup_or_null(srvc->pass);
 919
 920         credential_fill(cred, 1);
 921
 922         if (!srvc->user)
 923                 srvc->user = xstrdup(cred->username);
 924         if (!srvc->pass)
 925                 srvc->pass = xstrdup(cred->password);
 926 }
 927
 928 static struct imap_store *imap_open_store(struct imap_server_conf *srvc, const char *folder)
 929 {
 930         struct credential cred = CREDENTIAL_INIT;
 931         struct imap_store *ctx;
 932         struct imap *imap;
 933         char *arg, *rsp;
 934         int s = -1, preauth;
 935
 936         CALLOC_ARRAY(ctx, 1);
 937
 938         ctx->cfg = srvc;
 939         ctx->imap = CALLOC_ARRAY(imap, 1);
 940         imap->buf.sock.fd[0] = imap->buf.sock.fd[1] = -1;
 941         imap->in_progress_append = &imap->in_progress;
 942
 943         /* open connection to IMAP server */
 944
 945         if (srvc->tunnel) {
 946                 struct child_process tunnel = CHILD_PROCESS_INIT;
 947
 948                 imap_info("Starting tunnel '%s'... ", srvc->tunnel);
 949
 950                 strvec_push(&tunnel.args, srvc->tunnel);
 951                 tunnel.use_shell = 1;
 952                 tunnel.in = -1;
 953                 tunnel.out = -1;
 954                 if (start_command(&tunnel))
 955                         die("cannot start proxy %s", srvc->tunnel);
 956
 957                 imap->buf.sock.fd[0] = tunnel.out;
 958                 imap->buf.sock.fd[1] = tunnel.in;
 959
 960                 imap_info("ok\n");
 961         } else {
 962 #ifndef NO_IPV6
 963                 struct addrinfo hints, *ai0, *ai;
 964                 int gai;
 965                 char portstr[6];
 966
 967                 xsnprintf(portstr, sizeof(portstr), "%d", srvc->port);
 968
 969                 memset(&hints, 0, sizeof(hints));
 970                 hints.ai_socktype = SOCK_STREAM;
 971                 hints.ai_protocol = IPPROTO_TCP;
 972
 973                 imap_info("Resolving %s... ", srvc->host);
 974                 gai = getaddrinfo(srvc->host, portstr, &hints, &ai);
 975                 if (gai) {
 976                         fprintf(stderr, "getaddrinfo: %s\n", gai_strerror(gai));
 977                         goto bail;
 978                 }
 979                 imap_info("ok\n");
 980
 981                 for (ai0 = ai; ai; ai = ai->ai_next) {
 982                         char addr[NI_MAXHOST];
 983
 984                         s = socket(ai->ai_family, ai->ai_socktype,
 985                                    ai->ai_protocol);
 986                         if (s < 0)
 987                                 continue;
 988
 989                         getnameinfo(ai->ai_addr, ai->ai_addrlen, addr,
 990                                     sizeof(addr), NULL, 0, NI_NUMERICHOST);
 991                         imap_info("Connecting to [%s]:%s... ", addr, portstr);
 992
 993                         if (connect(s, ai->ai_addr, ai->ai_addrlen) < 0) {
 994                                 close(s);
 995                                 s = -1;
 996                                 perror("connect");
 997                                 continue;
 998                         }
 999
1000                         break;
1001                 }
1002                 freeaddrinfo(ai0);
1003 #else /* NO_IPV6 */
1004                 struct hostent *he;
1005                 struct sockaddr_in addr;
1006
1007                 memset(&addr, 0, sizeof(addr));
1008                 addr.sin_port = htons(srvc->port);
1009                 addr.sin_family = AF_INET;
1010
1011                 imap_info("Resolving %s... ", srvc->host);
1012                 he = gethostbyname(srvc->host);
1013                 if (!he) {
1014                         perror("gethostbyname");
1015                         goto bail;
1016                 }
1017                 imap_info("ok\n");
1018
1019                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
1020
1021                 s = socket(PF_INET, SOCK_STREAM, 0);
1022
1023                 imap_info("Connecting to %s:%hu... ", inet_ntoa(addr.sin_addr), ntohs(addr.sin_port));
1024                 if (connect(s, (struct sockaddr *)&addr, sizeof(addr))) {
1025                         close(s);
1026                         s = -1;
1027                         perror("connect");
1028                 }
1029 #endif
1030                 if (s < 0) {
1031                         fputs("Error: unable to connect to server.\n", stderr);
1032                         goto bail;
1033                 }
1034
1035                 imap->buf.sock.fd[0] = s;
1036                 imap->buf.sock.fd[1] = dup(s);
1037
1038                 if (srvc->use_ssl &&
1039                     ssl_socket_connect(&imap->buf.sock, srvc, 0)) {
1040                         close(s);
1041                         goto bail;
1042                 }
1043                 imap_info("ok\n");
1044         }
1045
1046         /* read the greeting string */
1047         if (buffer_gets(&imap->buf, &rsp)) {
1048                 fprintf(stderr, "IMAP error: no greeting response\n");
1049                 goto bail;
1050         }
1051         arg = next_arg(&rsp);
1052         if (!arg || *arg != '*' || (arg = next_arg(&rsp)) == NULL) {
1053                 fprintf(stderr, "IMAP error: invalid greeting response\n");
1054                 goto bail;
1055         }
1056         preauth = 0;
1057         if (!strcmp("PREAUTH", arg))
1058                 preauth = 1;
1059         else if (strcmp("OK", arg) != 0) {
1060                 fprintf(stderr, "IMAP error: unknown greeting response\n");
1061                 goto bail;
1062         }
1063         parse_response_code(ctx, NULL, rsp);
1064         if (!imap->caps && imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1065                 goto bail;
1066
1067         if (!preauth) {
1068 #ifndef NO_OPENSSL
1069                 if (!srvc->use_ssl && CAP(STARTTLS)) {
1070                         if (imap_exec(ctx, NULL, "STARTTLS") != RESP_OK)
1071                                 goto bail;
1072                         if (ssl_socket_connect(&imap->buf.sock, srvc, 1))
1073                                 goto bail;
1074                         /* capabilities may have changed, so get the new capabilities */
1075                         if (imap_exec(ctx, NULL, "CAPABILITY") != RESP_OK)
1076                                 goto bail;
1077                 }
1078 #endif
1079                 imap_info("Logging in...\n");
1080                 server_fill_credential(srvc, &cred);
1081
1082                 if (srvc->auth_method) {
1083                         struct imap_cmd_cb cb;
1084
1085                         if (!strcmp(srvc->auth_method, "CRAM-MD5")) {
1086                                 if (!CAP(AUTH_CRAM_MD5)) {
1087                                         fprintf(stderr, "You specified "
1088                                                 "CRAM-MD5 as authentication method, "
1089                                                 "but %s doesn't support it.\n", srvc->host);
1090                                         goto bail;
1091                                 }
1092                                 /* CRAM-MD5 */
1093
1094                                 memset(&cb, 0, sizeof(cb));
1095                                 cb.cont = auth_cram_md5;
1096                                 if (imap_exec(ctx, &cb, "AUTHENTICATE CRAM-MD5") != RESP_OK) {
1097                                         fprintf(stderr, "IMAP error: AUTHENTICATE CRAM-MD5 failed\n");
1098                                         goto bail;
1099                                 }
1100                         } else {
1101                                 fprintf(stderr, "Unknown authentication method:%s\n", srvc->host);
1102                                 goto bail;
1103                         }
1104                 } else {
1105                         if (CAP(NOLOGIN)) {
1106                                 fprintf(stderr, "Skipping account %s@%s, server forbids LOGIN\n",
1107                                         srvc->user, srvc->host);
1108                                 goto bail;
1109                         }
1110                         if (!imap->buf.sock.ssl)
1111                                 imap_warn("*** IMAP Warning *** Password is being "
1112                                           "sent in the clear\n");
1113                         if (imap_exec(ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass) != RESP_OK) {
1114                                 fprintf(stderr, "IMAP error: LOGIN failed\n");
1115                                 goto bail;
1116                         }
1117                 }
1118         } /* !preauth */
1119
1120         if (cred.username)
1121                 credential_approve(&cred);
1122         credential_clear(&cred);
1123
1124         /* check the target mailbox exists */
1125         ctx->name = folder;
1126         switch (imap_exec(ctx, NULL, "EXAMINE \"%s\"", ctx->name)) {
1127         case RESP_OK:
1128                 /* ok */
1129                 break;
1130         case RESP_BAD:
1131                 fprintf(stderr, "IMAP error: could not check mailbox\n");
1132                 goto out;
1133         case RESP_NO:
1134                 if (imap_exec(ctx, NULL, "CREATE \"%s\"", ctx->name) == RESP_OK) {
1135                         imap_info("Created missing mailbox\n");
1136                 } else {
1137                         fprintf(stderr, "IMAP error: could not create missing mailbox\n");
1138                         goto out;
1139                 }
1140                 break;
1141         }
1142
1143         ctx->prefix = "";
1144         return ctx;
1145
1146 bail:
1147         if (cred.username)
1148                 credential_reject(&cred);
1149         credential_clear(&cred);
1150
1151  out:
1152         imap_close_store(ctx);
1153         return NULL;
1154 }
1155
1156 /*
1157  * Insert CR characters as necessary in *msg to ensure that every LF
1158  * character in *msg is preceded by a CR.
1159  */
1160 static void lf_to_crlf(struct strbuf *msg)
1161 {
1162         char *new_msg;
1163         size_t i, j;
1164         char lastc;
1165
1166         /* First pass: tally, in j, the size of the new_msg string: */
1167         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1168                 if (msg->buf[i] == '\n' && lastc != '\r')
1169                         j++; /* a CR will need to be added here */
1170                 lastc = msg->buf[i];
1171                 j++;
1172         }
1173
1174         new_msg = xmallocz(j);
1175
1176         /*
1177          * Second pass: write the new_msg string.  Note that this loop is
1178          * otherwise identical to the first pass.
1179          */
1180         for (i = j = 0, lastc = '\0'; i < msg->len; i++) {
1181                 if (msg->buf[i] == '\n' && lastc != '\r')
1182                         new_msg[j++] = '\r';
1183                 lastc = new_msg[j++] = msg->buf[i];
1184         }
1185         strbuf_attach(msg, new_msg, j, j + 1);
1186 }
1187
1188 /*
1189  * Store msg to IMAP.  Also detach and free the data from msg->data,
1190  * leaving msg->data empty.
1191  */
1192 static int imap_store_msg(struct imap_store *ctx, struct strbuf *msg)
1193 {
1194         struct imap *imap = ctx->imap;
1195         struct imap_cmd_cb cb;
1196         const char *prefix, *box;
1197         int ret;
1198
1199         lf_to_crlf(msg);
1200         memset(&cb, 0, sizeof(cb));
1201
1202         cb.dlen = msg->len;
1203         cb.data = strbuf_detach(msg, NULL);
1204
1205         box = ctx->name;
1206         prefix = !strcmp(box, "INBOX") ? "" : ctx->prefix;
1207         ret = imap_exec_m(ctx, &cb, "APPEND \"%s%s\" ", prefix, box);
1208         imap->caps = imap->rcaps;
1209         if (ret != DRV_OK)
1210                 return ret;
1211
1212         return DRV_OK;
1213 }
1214
1215 static void wrap_in_html(struct strbuf *msg)
1216 {
1217         struct strbuf buf = STRBUF_INIT;
1218         static const char *content_type = "Content-Type: text/html;\n";
1219         static const char *pre_open = "<pre>\n";
1220         static const char *pre_close = "</pre>\n";
1221         const char *body = strstr(msg->buf, "\n\n");
1222
1223         if (!body)
1224                 return; /* Headers but no body; no wrapping needed */
1225
1226         body += 2;
1227
1228         strbuf_add(&buf, msg->buf, body - msg->buf - 1);
1229         strbuf_addstr(&buf, content_type);
1230         strbuf_addch(&buf, '\n');
1231         strbuf_addstr(&buf, pre_open);
1232         strbuf_addstr_xml_quoted(&buf, body);
1233         strbuf_addstr(&buf, pre_close);
1234
1235         strbuf_release(msg);
1236         *msg = buf;
1237 }
1238
1239 static int count_messages(struct strbuf *all_msgs)
1240 {
1241         int count = 0;
1242         char *p = all_msgs->buf;
1243
1244         while (1) {
1245                 if (starts_with(p, "From ")) {
1246                         p = strstr(p+5, "\nFrom: ");
1247                         if (!p) break;
1248                         p = strstr(p+7, "\nDate: ");
1249                         if (!p) break;
1250                         p = strstr(p+7, "\nSubject: ");
1251                         if (!p) break;
1252                         p += 10;
1253                         count++;
1254                 }
1255                 p = strstr(p+5, "\nFrom ");
1256                 if (!p)
1257                         break;
1258                 p++;
1259         }
1260         return count;
1261 }
1262
1263 /*
1264  * Copy the next message from all_msgs, starting at offset *ofs, to
1265  * msg.  Update *ofs to the start of the following message.  Return
1266  * true iff a message was successfully copied.
1267  */
1268 static int split_msg(struct strbuf *all_msgs, struct strbuf *msg, int *ofs)
1269 {
1270         char *p, *data;
1271         size_t len;
1272
1273         if (*ofs >= all_msgs->len)
1274                 return 0;
1275
1276         data = &all_msgs->buf[*ofs];
1277         len = all_msgs->len - *ofs;
1278
1279         if (len < 5 || !starts_with(data, "From "))
1280                 return 0;
1281
1282         p = strchr(data, '\n');
1283         if (p) {
1284                 p++;
1285                 len -= p - data;
1286                 *ofs += p - data;
1287                 data = p;
1288         }
1289
1290         p = strstr(data, "\nFrom ");
1291         if (p)
1292                 len = &p[1] - data;
1293
1294         strbuf_add(msg, data, len);
1295         *ofs += len;
1296         return 1;
1297 }
1298
1299 static int git_imap_config(const char *var, const char *val,
1300                            const struct config_context *ctx, void *cb)
1301 {
1302         struct imap_server_conf *cfg = cb;
1303
1304         if (!strcmp("imap.sslverify", var)) {
1305                 cfg->ssl_verify = git_config_bool(var, val);
1306         } else if (!strcmp("imap.preformattedhtml", var)) {
1307                 cfg->use_html = git_config_bool(var, val);
1308         } else if (!strcmp("imap.folder", var)) {
1309                 FREE_AND_NULL(cfg->folder);
1310                 return git_config_string(&cfg->folder, var, val);
1311         } else if (!strcmp("imap.user", var)) {
1312                 FREE_AND_NULL(cfg->folder);
1313                 return git_config_string(&cfg->user, var, val);
1314         } else if (!strcmp("imap.pass", var)) {
1315                 FREE_AND_NULL(cfg->folder);
1316                 return git_config_string(&cfg->pass, var, val);
1317         } else if (!strcmp("imap.tunnel", var)) {
1318                 FREE_AND_NULL(cfg->folder);
1319                 return git_config_string(&cfg->tunnel, var, val);
1320         } else if (!strcmp("imap.authmethod", var)) {
1321                 FREE_AND_NULL(cfg->folder);
1322                 return git_config_string(&cfg->auth_method, var, val);
1323         } else if (!strcmp("imap.port", var)) {
1324                 cfg->port = git_config_int(var, val, ctx->kvi);
1325         } else if (!strcmp("imap.host", var)) {
1326                 if (!val) {
1327                         return config_error_nonbool(var);
1328                 } else {
1329                         if (starts_with(val, "imap:"))
1330                                 val += 5;
1331                         else if (starts_with(val, "imaps:")) {
1332                                 val += 6;
1333                                 cfg->use_ssl = 1;
1334                         }
1335                         if (starts_with(val, "//"))
1336                                 val += 2;
1337                         cfg->host = xstrdup(val);
1338                 }
1339         } else {
1340                 return git_default_config(var, val, ctx, cb);
1341         }
1342
1343         return 0;
1344 }
1345
1346 static int append_msgs_to_imap(struct imap_server_conf *server,
1347                                struct strbuf* all_msgs, int total)
1348 {
1349         struct strbuf msg = STRBUF_INIT;
1350         struct imap_store *ctx = NULL;
1351         int ofs = 0;
1352         int r;
1353         int n = 0;
1354
1355         ctx = imap_open_store(server, server->folder);
1356         if (!ctx) {
1357                 fprintf(stderr, "failed to open store\n");
1358                 return 1;
1359         }
1360         ctx->name = server->folder;
1361
1362         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1363         while (1) {
1364                 unsigned percent = n * 100 / total;
1365
1366                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1367
1368                 if (!split_msg(all_msgs, &msg, &ofs))
1369                         break;
1370                 if (server->use_html)
1371                         wrap_in_html(&msg);
1372                 r = imap_store_msg(ctx, &msg);
1373                 if (r != DRV_OK)
1374                         break;
1375                 n++;
1376         }
1377         fprintf(stderr, "\n");
1378
1379         imap_close_store(ctx);
1380
1381         return 0;
1382 }
1383
1384 #ifdef USE_CURL_FOR_IMAP_SEND
1385 static CURL *setup_curl(struct imap_server_conf *srvc, struct credential *cred)
1386 {
1387         CURL *curl;
1388         struct strbuf path = STRBUF_INIT;
1389         char *uri_encoded_folder;
1390
1391         if (curl_global_init(CURL_GLOBAL_ALL) != CURLE_OK)
1392                 die("curl_global_init failed");
1393
1394         curl = curl_easy_init();
1395
1396         if (!curl)
1397                 die("curl_easy_init failed");
1398
1399         server_fill_credential(srvc, cred);
1400         curl_easy_setopt(curl, CURLOPT_USERNAME, srvc->user);
1401         curl_easy_setopt(curl, CURLOPT_PASSWORD, srvc->pass);
1402
1403         strbuf_addstr(&path, srvc->use_ssl ? "imaps://" : "imap://");
1404         strbuf_addstr(&path, srvc->host);
1405         if (!path.len || path.buf[path.len - 1] != '/')
1406                 strbuf_addch(&path, '/');
1407
1408         uri_encoded_folder = curl_easy_escape(curl, srvc->folder, 0);
1409         if (!uri_encoded_folder)
1410                 die("failed to encode server folder");
1411         strbuf_addstr(&path, uri_encoded_folder);
1412         curl_free(uri_encoded_folder);
1413
1414         curl_easy_setopt(curl, CURLOPT_URL, path.buf);
1415         strbuf_release(&path);
1416         curl_easy_setopt(curl, CURLOPT_PORT, srvc->port);
1417
1418         if (srvc->auth_method) {
1419 #ifndef GIT_CURL_HAVE_CURLOPT_LOGIN_OPTIONS
1420                 warning("No LOGIN_OPTIONS support in this cURL version");
1421 #else
1422                 struct strbuf auth = STRBUF_INIT;
1423                 strbuf_addstr(&auth, "AUTH=");
1424                 strbuf_addstr(&auth, srvc->auth_method);
1425                 curl_easy_setopt(curl, CURLOPT_LOGIN_OPTIONS, auth.buf);
1426                 strbuf_release(&auth);
1427 #endif
1428         }
1429
1430         if (!srvc->use_ssl)
1431                 curl_easy_setopt(curl, CURLOPT_USE_SSL, (long)CURLUSESSL_TRY);
1432
1433         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYPEER, srvc->ssl_verify);
1434         curl_easy_setopt(curl, CURLOPT_SSL_VERIFYHOST, srvc->ssl_verify);
1435
1436         curl_easy_setopt(curl, CURLOPT_READFUNCTION, fread_buffer);
1437
1438         curl_easy_setopt(curl, CURLOPT_UPLOAD, 1L);
1439
1440         if (0 < verbosity || getenv("GIT_CURL_VERBOSE"))
1441                 http_trace_curl_no_data();
1442         setup_curl_trace(curl);
1443
1444         return curl;
1445 }
1446
1447 static int curl_append_msgs_to_imap(struct imap_server_conf *server,
1448                                     struct strbuf* all_msgs, int total)
1449 {
1450         int ofs = 0;
1451         int n = 0;
1452         struct buffer msgbuf = { STRBUF_INIT, 0 };
1453         CURL *curl;
1454         CURLcode res = CURLE_OK;
1455         struct credential cred = CREDENTIAL_INIT;
1456
1457         curl = setup_curl(server, &cred);
1458         curl_easy_setopt(curl, CURLOPT_READDATA, &msgbuf);
1459
1460         fprintf(stderr, "sending %d message%s\n", total, (total != 1) ? "s" : "");
1461         while (1) {
1462                 unsigned percent = n * 100 / total;
1463                 int prev_len;
1464
1465                 fprintf(stderr, "%4u%% (%d/%d) done\r", percent, n, total);
1466
1467                 prev_len = msgbuf.buf.len;
1468                 if (!split_msg(all_msgs, &msgbuf.buf, &ofs))
1469                         break;
1470                 if (server->use_html)
1471                         wrap_in_html(&msgbuf.buf);
1472                 lf_to_crlf(&msgbuf.buf);
1473
1474                 curl_easy_setopt(curl, CURLOPT_INFILESIZE_LARGE,
1475                                  (curl_off_t)(msgbuf.buf.len-prev_len));
1476
1477                 res = curl_easy_perform(curl);
1478
1479                 if(res != CURLE_OK) {
1480                         fprintf(stderr, "curl_easy_perform() failed: %s\n",
1481                                         curl_easy_strerror(res));
1482                         break;
1483                 }
1484
1485                 n++;
1486         }
1487         fprintf(stderr, "\n");
1488
1489         curl_easy_cleanup(curl);
1490         curl_global_cleanup();
1491
1492         if (cred.username) {
1493                 if (res == CURLE_OK)
1494                         credential_approve(&cred);
1495                 else if (res == CURLE_LOGIN_DENIED)
1496                         credential_reject(&cred);
1497         }
1498
1499         credential_clear(&cred);
1500
1501         return res != CURLE_OK;
1502 }
1503 #endif
1504
1505 int cmd_main(int argc, const char **argv)
1506 {
1507         struct imap_server_conf server = {
1508                 .ssl_verify = 1,
1509         };
1510         struct strbuf all_msgs = STRBUF_INIT;
1511         int total;
1512         int nongit_ok;
1513         int ret;
1514
1515         setup_git_directory_gently(&nongit_ok);
1516         git_config(git_imap_config, &server);
1517
1518         argc = parse_options(argc, (const char **)argv, "", imap_send_options, imap_send_usage, 0);
1519
1520         if (argc)
1521                 usage_with_options(imap_send_usage, imap_send_options);
1522
1523 #ifndef USE_CURL_FOR_IMAP_SEND
1524         if (use_curl) {
1525                 warning("--curl not supported in this build");
1526                 use_curl = 0;
1527         }
1528 #elif defined(NO_OPENSSL)
1529         if (!use_curl) {
1530                 warning("--no-curl not supported in this build");
1531                 use_curl = 1;
1532         }
1533 #endif
1534
1535         if (!server.port)
1536                 server.port = server.use_ssl ? 993 : 143;
1537
1538         if (!server.folder) {
1539                 fprintf(stderr, "no imap store specified\n");
1540                 ret = 1;
1541                 goto out;
1542         }
1543         if (!server.host) {
1544                 if (!server.tunnel) {
1545                         fprintf(stderr, "no imap host specified\n");
1546                         ret = 1;
1547                         goto out;
1548                 }
1549                 server.host = xstrdup("tunnel");
1550         }
1551
1552         /* read the messages */
1553         if (strbuf_read(&all_msgs, 0, 0) < 0) {
1554                 error_errno(_("could not read from stdin"));
1555                 ret = 1;
1556                 goto out;
1557         }
1558
1559         if (all_msgs.len == 0) {
1560                 fprintf(stderr, "nothing to send\n");
1561                 ret = 1;
1562                 goto out;
1563         }
1564
1565         total = count_messages(&all_msgs);
1566         if (!total) {
1567                 fprintf(stderr, "no messages to send\n");
1568                 ret = 1;
1569                 goto out;
1570         }
1571
1572         /* write it to the imap server */
1573
1574         if (server.tunnel)
1575                 ret = append_msgs_to_imap(&server, &all_msgs, total);
1576 #ifdef USE_CURL_FOR_IMAP_SEND
1577         else if (use_curl)
1578                 ret = curl_append_msgs_to_imap(&server, &all_msgs, total);
1579 #endif
1580         else
1581                 ret = append_msgs_to_imap(&server, &all_msgs, total);
1582
1583 out:
1584         free(server.tunnel);
1585         free(server.host);
1586         free(server.folder);
1587         free(server.user);
1588         free(server.pass);
1589         free(server.auth_method);
1590         strbuf_release(&all_msgs);
1591         return ret;
1592 }