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, write to the Free Software
  22  *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  23  */
  24
  25 #include "cache.h"
  26
  27 typedef struct store_conf {
  28         char *name;
  29         const char *path; /* should this be here? its interpretation is driver-specific */
  30         char *map_inbox;
  31         char *trash;
  32         unsigned max_size; /* off_t is overkill */
  33         unsigned trash_remote_new:1, trash_only_new:1;
  34 } store_conf_t;
  35
  36 typedef struct string_list {
  37         struct string_list *next;
  38         char string[1];
  39 } string_list_t;
  40
  41 typedef struct channel_conf {
  42         struct channel_conf *next;
  43         char *name;
  44         store_conf_t *master, *slave;
  45         char *master_name, *slave_name;
  46         char *sync_state;
  47         string_list_t *patterns;
  48         int mops, sops;
  49         unsigned max_messages; /* for slave only */
  50 } channel_conf_t;
  51
  52 typedef struct group_conf {
  53         struct group_conf *next;
  54         char *name;
  55         string_list_t *channels;
  56 } group_conf_t;
  57
  58 /* For message->status */
  59 #define M_RECENT       (1<<0) /* unsyncable flag; maildir_* depend on this being 1<<0 */
  60 #define M_DEAD         (1<<1) /* expunged */
  61 #define M_FLAGS        (1<<2) /* flags fetched */
  62
  63 typedef struct message {
  64         struct message *next;
  65         /* string_list_t *keywords; */
  66         size_t size; /* zero implies "not fetched" */
  67         int uid;
  68         unsigned char flags, status;
  69 } message_t;
  70
  71 typedef struct store {
  72         store_conf_t *conf; /* foreign */
  73
  74         /* currently open mailbox */
  75         const char *name; /* foreign! maybe preset? */
  76         char *path; /* own */
  77         message_t *msgs; /* own */
  78         int uidvalidity;
  79         unsigned char opts; /* maybe preset? */
  80         /* note that the following do _not_ reflect stats from msgs, but mailbox totals */
  81         int count; /* # of messages */
  82         int recent; /* # of recent messages - don't trust this beyond the initial read */
  83 } store_t;
  84
  85 typedef struct {
  86         char *data;
  87         int len;
  88         unsigned char flags;
  89         unsigned int crlf:1;
  90 } msg_data_t;
  91
  92 #define DRV_OK          0
  93 #define DRV_MSG_BAD     -1
  94 #define DRV_BOX_BAD     -2
  95 #define DRV_STORE_BAD   -3
  96
  97 static int Verbose, Quiet;
  98
  99 static void imap_info( const char *, ... );
 100 static void imap_warn( const char *, ... );
 101
 102 static char *next_arg( char ** );
 103
 104 static void free_generic_messages( message_t * );
 105
 106 static int nfsnprintf( char *buf, int blen, const char *fmt, ... );
 107
 108
 109 static void arc4_init( void );
 110 static unsigned char arc4_getbyte( void );
 111
 112 typedef struct imap_server_conf {
 113         char *name;
 114         char *tunnel;
 115         char *host;
 116         int port;
 117         char *user;
 118         char *pass;
 119 } imap_server_conf_t;
 120
 121 typedef struct imap_store_conf {
 122         store_conf_t gen;
 123         imap_server_conf_t *server;
 124         unsigned use_namespace:1;
 125 } imap_store_conf_t;
 126
 127 #define NIL     (void*)0x1
 128 #define LIST    (void*)0x2
 129
 130 typedef struct _list {
 131         struct _list *next, *child;
 132         char *val;
 133         int len;
 134 } list_t;
 135
 136 typedef struct {
 137         int fd;
 138 } Socket_t;
 139
 140 typedef struct {
 141         Socket_t sock;
 142         int bytes;
 143         int offset;
 144         char buf[1024];
 145 } buffer_t;
 146
 147 struct imap_cmd;
 148
 149 typedef struct imap {
 150         int uidnext; /* from SELECT responses */
 151         list_t *ns_personal, *ns_other, *ns_shared; /* NAMESPACE info */
 152         unsigned caps, rcaps; /* CAPABILITY results */
 153         /* command queue */
 154         int nexttag, num_in_progress, literal_pending;
 155         struct imap_cmd *in_progress, **in_progress_append;
 156         buffer_t buf; /* this is BIG, so put it last */
 157 } imap_t;
 158
 159 typedef struct imap_store {
 160         store_t gen;
 161         int uidvalidity;
 162         imap_t *imap;
 163         const char *prefix;
 164         unsigned /*currentnc:1,*/ trashnc:1;
 165 } imap_store_t;
 166
 167 struct imap_cmd_cb {
 168         int (*cont)( imap_store_t *ctx, struct imap_cmd *cmd, const char *prompt );
 169         void (*done)( imap_store_t *ctx, struct imap_cmd *cmd, int response);
 170         void *ctx;
 171         char *data;
 172         int dlen;
 173         int uid;
 174         unsigned create:1, trycreate:1;
 175 };
 176
 177 struct imap_cmd {
 178         struct imap_cmd *next;
 179         struct imap_cmd_cb cb;
 180         char *cmd;
 181         int tag;
 182 };
 183
 184 #define CAP(cap) (imap->caps & (1 << (cap)))
 185
 186 enum CAPABILITY {
 187         NOLOGIN = 0,
 188         UIDPLUS,
 189         LITERALPLUS,
 190         NAMESPACE,
 191 };
 192
 193 static const char *cap_list[] = {
 194         "LOGINDISABLED",
 195         "UIDPLUS",
 196         "LITERAL+",
 197         "NAMESPACE",
 198 };
 199
 200 #define RESP_OK    0
 201 #define RESP_NO    1
 202 #define RESP_BAD   2
 203
 204 static int get_cmd_result( imap_store_t *ctx, struct imap_cmd *tcmd );
 205
 206
 207 static const char *Flags[] = {
 208         "Draft",
 209         "Flagged",
 210         "Answered",
 211         "Seen",
 212         "Deleted",
 213 };
 214
 215 static void
 216 socket_perror( const char *func, Socket_t *sock, int ret )
 217 {
 218         if (ret < 0)
 219                 perror( func );
 220         else
 221                 fprintf( stderr, "%s: unexpected EOF\n", func );
 222 }
 223
 224 static int
 225 socket_read( Socket_t *sock, char *buf, int len )
 226 {
 227         ssize_t n = xread( sock->fd, buf, len );
 228         if (n <= 0) {
 229                 socket_perror( "read", sock, n );
 230                 close( sock->fd );
 231                 sock->fd = -1;
 232         }
 233         return n;
 234 }
 235
 236 static int
 237 socket_write( Socket_t *sock, const char *buf, int len )
 238 {
 239         int n = write_in_full( sock->fd, buf, len );
 240         if (n != len) {
 241                 socket_perror( "write", sock, n );
 242                 close( sock->fd );
 243                 sock->fd = -1;
 244         }
 245         return n;
 246 }
 247
 248 /* simple line buffering */
 249 static int
 250 buffer_gets( buffer_t * b, char **s )
 251 {
 252         int n;
 253         int start = b->offset;
 254
 255         *s = b->buf + start;
 256
 257         for (;;) {
 258                 /* make sure we have enough data to read the \r\n sequence */
 259                 if (b->offset + 1 >= b->bytes) {
 260                         if (start) {
 261                                 /* shift down used bytes */
 262                                 *s = b->buf;
 263
 264                                 assert( start <= b->bytes );
 265                                 n = b->bytes - start;
 266
 267                                 if (n)
 268                                         memmove(b->buf, b->buf + start, n);
 269                                 b->offset -= start;
 270                                 b->bytes = n;
 271                                 start = 0;
 272                         }
 273
 274                         n = socket_read( &b->sock, b->buf + b->bytes,
 275                                          sizeof(b->buf) - b->bytes );
 276
 277                         if (n <= 0)
 278                                 return -1;
 279
 280                         b->bytes += n;
 281                 }
 282
 283                 if (b->buf[b->offset] == '\r') {
 284                         assert( b->offset + 1 < b->bytes );
 285                         if (b->buf[b->offset + 1] == '\n') {
 286                                 b->buf[b->offset] = 0;  /* terminate the string */
 287                                 b->offset += 2; /* next line */
 288                                 if (Verbose)
 289                                         puts( *s );
 290                                 return 0;
 291                         }
 292                 }
 293
 294                 b->offset++;
 295         }
 296         /* not reached */
 297 }
 298
 299 static void
 300 imap_info( const char *msg, ... )
 301 {
 302         va_list va;
 303
 304         if (!Quiet) {
 305                 va_start( va, msg );
 306                 vprintf( msg, va );
 307                 va_end( va );
 308                 fflush( stdout );
 309         }
 310 }
 311
 312 static void
 313 imap_warn( const char *msg, ... )
 314 {
 315         va_list va;
 316
 317         if (Quiet < 2) {
 318                 va_start( va, msg );
 319                 vfprintf( stderr, msg, va );
 320                 va_end( va );
 321         }
 322 }
 323
 324 static char *
 325 next_arg( char **s )
 326 {
 327         char *ret;
 328
 329         if (!s || !*s)
 330                 return NULL;
 331         while (isspace( (unsigned char) **s ))
 332                 (*s)++;
 333         if (!**s) {
 334                 *s = NULL;
 335                 return NULL;
 336         }
 337         if (**s == '"') {
 338                 ++*s;
 339                 ret = *s;
 340                 *s = strchr( *s, '"' );
 341         } else {
 342                 ret = *s;
 343                 while (**s && !isspace( (unsigned char) **s ))
 344                         (*s)++;
 345         }
 346         if (*s) {
 347                 if (**s)
 348                         *(*s)++ = 0;
 349                 if (!**s)
 350                         *s = NULL;
 351         }
 352         return ret;
 353 }
 354
 355 static void
 356 free_generic_messages( message_t *msgs )
 357 {
 358         message_t *tmsg;
 359
 360         for (; msgs; msgs = tmsg) {
 361                 tmsg = msgs->next;
 362                 free( msgs );
 363         }
 364 }
 365
 366 static int
 367 nfsnprintf( char *buf, int blen, const char *fmt, ... )
 368 {
 369         int ret;
 370         va_list va;
 371
 372         va_start( va, fmt );
 373         if (blen <= 0 || (unsigned)(ret = vsnprintf( buf, blen, fmt, va )) >= (unsigned)blen)
 374                 die( "Fatal: buffer too small. Please report a bug.\n");
 375         va_end( va );
 376         return ret;
 377 }
 378
 379 static struct {
 380         unsigned char i, j, s[256];
 381 } rs;
 382
 383 static void
 384 arc4_init( void )
 385 {
 386         int i, fd;
 387         unsigned char j, si, dat[128];
 388
 389         if ((fd = open( "/dev/urandom", O_RDONLY )) < 0 && (fd = open( "/dev/random", O_RDONLY )) < 0) {
 390                 fprintf( stderr, "Fatal: no random number source available.\n" );
 391                 exit( 3 );
 392         }
 393         if (read_in_full( fd, dat, 128 ) != 128) {
 394                 fprintf( stderr, "Fatal: cannot read random number source.\n" );
 395                 exit( 3 );
 396         }
 397         close( fd );
 398
 399         for (i = 0; i < 256; i++)
 400                 rs.s[i] = i;
 401         for (i = j = 0; i < 256; i++) {
 402                 si = rs.s[i];
 403                 j += si + dat[i & 127];
 404                 rs.s[i] = rs.s[j];
 405                 rs.s[j] = si;
 406         }
 407         rs.i = rs.j = 0;
 408
 409         for (i = 0; i < 256; i++)
 410                 arc4_getbyte();
 411 }
 412
 413 static unsigned char
 414 arc4_getbyte( void )
 415 {
 416         unsigned char si, sj;
 417
 418         rs.i++;
 419         si = rs.s[rs.i];
 420         rs.j += si;
 421         sj = rs.s[rs.j];
 422         rs.s[rs.i] = sj;
 423         rs.s[rs.j] = si;
 424         return rs.s[(si + sj) & 0xff];
 425 }
 426
 427 static struct imap_cmd *
 428 v_issue_imap_cmd( imap_store_t *ctx, struct imap_cmd_cb *cb,
 429                   const char *fmt, va_list ap )
 430 {
 431         imap_t *imap = ctx->imap;
 432         struct imap_cmd *cmd;
 433         int n, bufl;
 434         char buf[1024];
 435
 436         cmd = xmalloc( sizeof(struct imap_cmd) );
 437         nfvasprintf( &cmd->cmd, fmt, ap );
 438         cmd->tag = ++imap->nexttag;
 439
 440         if (cb)
 441                 cmd->cb = *cb;
 442         else
 443                 memset( &cmd->cb, 0, sizeof(cmd->cb) );
 444
 445         while (imap->literal_pending)
 446                 get_cmd_result( ctx, NULL );
 447
 448         bufl = nfsnprintf( buf, sizeof(buf), cmd->cb.data ? CAP(LITERALPLUS) ?
 449                            "%d %s{%d+}\r\n" : "%d %s{%d}\r\n" : "%d %s\r\n",
 450                            cmd->tag, cmd->cmd, cmd->cb.dlen );
 451         if (Verbose) {
 452                 if (imap->num_in_progress)
 453                         printf( "(%d in progress) ", imap->num_in_progress );
 454                 if (memcmp( cmd->cmd, "LOGIN", 5 ))
 455                         printf( ">>> %s", buf );
 456                 else
 457                         printf( ">>> %d LOGIN <user> <pass>\n", cmd->tag );
 458         }
 459         if (socket_write( &imap->buf.sock, buf, bufl ) != bufl) {
 460                 free( cmd->cmd );
 461                 free( cmd );
 462                 if (cb && cb->data)
 463                         free( cb->data );
 464                 return NULL;
 465         }
 466         if (cmd->cb.data) {
 467                 if (CAP(LITERALPLUS)) {
 468                         n = socket_write( &imap->buf.sock, cmd->cb.data, cmd->cb.dlen );
 469                         free( cmd->cb.data );
 470                         if (n != cmd->cb.dlen ||
 471                             (n = socket_write( &imap->buf.sock, "\r\n", 2 )) != 2)
 472                         {
 473                                 free( cmd->cmd );
 474                                 free( cmd );
 475                                 return NULL;
 476                         }
 477                         cmd->cb.data = NULL;
 478                 } else
 479                         imap->literal_pending = 1;
 480         } else if (cmd->cb.cont)
 481                 imap->literal_pending = 1;
 482         cmd->next = NULL;
 483         *imap->in_progress_append = cmd;
 484         imap->in_progress_append = &cmd->next;
 485         imap->num_in_progress++;
 486         return cmd;
 487 }
 488
 489 static struct imap_cmd *
 490 issue_imap_cmd( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 491 {
 492         struct imap_cmd *ret;
 493         va_list ap;
 494
 495         va_start( ap, fmt );
 496         ret = v_issue_imap_cmd( ctx, cb, fmt, ap );
 497         va_end( ap );
 498         return ret;
 499 }
 500
 501 static int
 502 imap_exec( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 503 {
 504         va_list ap;
 505         struct imap_cmd *cmdp;
 506
 507         va_start( ap, fmt );
 508         cmdp = v_issue_imap_cmd( ctx, cb, fmt, ap );
 509         va_end( ap );
 510         if (!cmdp)
 511                 return RESP_BAD;
 512
 513         return get_cmd_result( ctx, cmdp );
 514 }
 515
 516 static int
 517 imap_exec_m( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 518 {
 519         va_list ap;
 520         struct imap_cmd *cmdp;
 521
 522         va_start( ap, fmt );
 523         cmdp = v_issue_imap_cmd( ctx, cb, fmt, ap );
 524         va_end( ap );
 525         if (!cmdp)
 526                 return DRV_STORE_BAD;
 527
 528         switch (get_cmd_result( ctx, cmdp )) {
 529         case RESP_BAD: return DRV_STORE_BAD;
 530         case RESP_NO: return DRV_MSG_BAD;
 531         default: return DRV_OK;
 532         }
 533 }
 534
 535 static int
 536 is_atom( list_t *list )
 537 {
 538         return list && list->val && list->val != NIL && list->val != LIST;
 539 }
 540
 541 static int
 542 is_list( list_t *list )
 543 {
 544         return list && list->val == LIST;
 545 }
 546
 547 static void
 548 free_list( list_t *list )
 549 {
 550         list_t *tmp;
 551
 552         for (; list; list = tmp) {
 553                 tmp = list->next;
 554                 if (is_list( list ))
 555                         free_list( list->child );
 556                 else if (is_atom( list ))
 557                         free( list->val );
 558                 free( list );
 559         }
 560 }
 561
 562 static int
 563 parse_imap_list_l( imap_t *imap, char **sp, list_t **curp, int level )
 564 {
 565         list_t *cur;
 566         char *s = *sp, *p;
 567         int n, bytes;
 568
 569         for (;;) {
 570                 while (isspace( (unsigned char)*s ))
 571                         s++;
 572                 if (level && *s == ')') {
 573                         s++;
 574                         break;
 575                 }
 576                 *curp = cur = xmalloc( sizeof(*cur) );
 577                 curp = &cur->next;
 578                 cur->val = NULL; /* for clean bail */
 579                 if (*s == '(') {
 580                         /* sublist */
 581                         s++;
 582                         cur->val = LIST;
 583                         if (parse_imap_list_l( imap, &s, &cur->child, level + 1 ))
 584                                 goto bail;
 585                 } else if (imap && *s == '{') {
 586                         /* literal */
 587                         bytes = cur->len = strtol( s + 1, &s, 10 );
 588                         if (*s != '}')
 589                                 goto bail;
 590
 591                         s = cur->val = xmalloc( cur->len );
 592
 593                         /* dump whats left over in the input buffer */
 594                         n = imap->buf.bytes - imap->buf.offset;
 595
 596                         if (n > bytes)
 597                                 /* the entire message fit in the buffer */
 598                                 n = bytes;
 599
 600                         memcpy( s, imap->buf.buf + imap->buf.offset, n );
 601                         s += n;
 602                         bytes -= n;
 603
 604                         /* mark that we used part of the buffer */
 605                         imap->buf.offset += n;
 606
 607                         /* now read the rest of the message */
 608                         while (bytes > 0) {
 609                                 if ((n = socket_read (&imap->buf.sock, s, bytes)) <= 0)
 610                                         goto bail;
 611                                 s += n;
 612                                 bytes -= n;
 613                         }
 614
 615                         if (buffer_gets( &imap->buf, &s ))
 616                                 goto bail;
 617                 } else if (*s == '"') {
 618                         /* quoted string */
 619                         s++;
 620                         p = s;
 621                         for (; *s != '"'; s++)
 622                                 if (!*s)
 623                                         goto bail;
 624                         cur->len = s - p;
 625                         s++;
 626                         cur->val = xmemdupz(p, cur->len);
 627                 } else {
 628                         /* atom */
 629                         p = s;
 630                         for (; *s && !isspace( (unsigned char)*s ); s++)
 631                                 if (level && *s == ')')
 632                                         break;
 633                         cur->len = s - p;
 634                         if (cur->len == 3 && !memcmp ("NIL", p, 3)) {
 635                                 cur->val = NIL;
 636                         } else {
 637                                 cur->val = xmemdupz(p, cur->len);
 638                         }
 639                 }
 640
 641                 if (!level)
 642                         break;
 643                 if (!*s)
 644                         goto bail;
 645         }
 646         *sp = s;
 647         *curp = NULL;
 648         return 0;
 649
 650   bail:
 651         *curp = NULL;
 652         return -1;
 653 }
 654
 655 static list_t *
 656 parse_imap_list( imap_t *imap, char **sp )
 657 {
 658         list_t *head;
 659
 660         if (!parse_imap_list_l( imap, sp, &head, 0 ))
 661                 return head;
 662         free_list( head );
 663         return NULL;
 664 }
 665
 666 static list_t *
 667 parse_list( char **sp )
 668 {
 669         return parse_imap_list( NULL, sp );
 670 }
 671
 672 static void
 673 parse_capability( imap_t *imap, char *cmd )
 674 {
 675         char *arg;
 676         unsigned i;
 677
 678         imap->caps = 0x80000000;
 679         while ((arg = next_arg( &cmd )))
 680                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 681                         if (!strcmp( cap_list[i], arg ))
 682                                 imap->caps |= 1 << i;
 683         imap->rcaps = imap->caps;
 684 }
 685
 686 static int
 687 parse_response_code( imap_store_t *ctx, struct imap_cmd_cb *cb, char *s )
 688 {
 689         imap_t *imap = ctx->imap;
 690         char *arg, *p;
 691
 692         if (*s != '[')
 693                 return RESP_OK;         /* no response code */
 694         s++;
 695         if (!(p = strchr( s, ']' ))) {
 696                 fprintf( stderr, "IMAP error: malformed response code\n" );
 697                 return RESP_BAD;
 698         }
 699         *p++ = 0;
 700         arg = next_arg( &s );
 701         if (!strcmp( "UIDVALIDITY", arg )) {
 702                 if (!(arg = next_arg( &s )) || !(ctx->gen.uidvalidity = atoi( arg ))) {
 703                         fprintf( stderr, "IMAP error: malformed UIDVALIDITY status\n" );
 704                         return RESP_BAD;
 705                 }
 706         } else if (!strcmp( "UIDNEXT", arg )) {
 707                 if (!(arg = next_arg( &s )) || !(imap->uidnext = atoi( arg ))) {
 708                         fprintf( stderr, "IMAP error: malformed NEXTUID status\n" );
 709                         return RESP_BAD;
 710                 }
 711         } else if (!strcmp( "CAPABILITY", arg )) {
 712                 parse_capability( imap, s );
 713         } else if (!strcmp( "ALERT", arg )) {
 714                 /* RFC2060 says that these messages MUST be displayed
 715                  * to the user
 716                  */
 717                 for (; isspace( (unsigned char)*p ); p++);
 718                 fprintf( stderr, "*** IMAP ALERT *** %s\n", p );
 719         } else if (cb && cb->ctx && !strcmp( "APPENDUID", arg )) {
 720                 if (!(arg = next_arg( &s )) || !(ctx->gen.uidvalidity = atoi( arg )) ||
 721                     !(arg = next_arg( &s )) || !(*(int *)cb->ctx = atoi( arg )))
 722                 {
 723                         fprintf( stderr, "IMAP error: malformed APPENDUID status\n" );
 724                         return RESP_BAD;
 725                 }
 726         }
 727         return RESP_OK;
 728 }
 729
 730 static int
 731 get_cmd_result( imap_store_t *ctx, struct imap_cmd *tcmd )
 732 {
 733         imap_t *imap = ctx->imap;
 734         struct imap_cmd *cmdp, **pcmdp, *ncmdp;
 735         char *cmd, *arg, *arg1, *p;
 736         int n, resp, resp2, tag;
 737
 738         for (;;) {
 739                 if (buffer_gets( &imap->buf, &cmd ))
 740                         return RESP_BAD;
 741
 742                 arg = next_arg( &cmd );
 743                 if (*arg == '*') {
 744                         arg = next_arg( &cmd );
 745                         if (!arg) {
 746                                 fprintf( stderr, "IMAP error: unable to parse untagged response\n" );
 747                                 return RESP_BAD;
 748                         }
 749
 750                         if (!strcmp( "NAMESPACE", arg )) {
 751                                 imap->ns_personal = parse_list( &cmd );
 752                                 imap->ns_other = parse_list( &cmd );
 753                                 imap->ns_shared = parse_list( &cmd );
 754                         } else if (!strcmp( "OK", arg ) || !strcmp( "BAD", arg ) ||
 755                                    !strcmp( "NO", arg ) || !strcmp( "BYE", arg )) {
 756                                 if ((resp = parse_response_code( ctx, NULL, cmd )) != RESP_OK)
 757                                         return resp;
 758                         } else if (!strcmp( "CAPABILITY", arg ))
 759                                 parse_capability( imap, cmd );
 760                         else if ((arg1 = next_arg( &cmd ))) {
 761                                 if (!strcmp( "EXISTS", arg1 ))
 762                                         ctx->gen.count = atoi( arg );
 763                                 else if (!strcmp( "RECENT", arg1 ))
 764                                         ctx->gen.recent = atoi( arg );
 765                         } else {
 766                                 fprintf( stderr, "IMAP error: unable to parse untagged response\n" );
 767                                 return RESP_BAD;
 768                         }
 769                 } else if (!imap->in_progress) {
 770                         fprintf( stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "" );
 771                         return RESP_BAD;
 772                 } else if (*arg == '+') {
 773                         /* This can happen only with the last command underway, as
 774                            it enforces a round-trip. */
 775                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 776                                offsetof(struct imap_cmd, next));
 777                         if (cmdp->cb.data) {
 778                                 n = socket_write( &imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen );
 779                                 free( cmdp->cb.data );
 780                                 cmdp->cb.data = NULL;
 781                                 if (n != (int)cmdp->cb.dlen)
 782                                         return RESP_BAD;
 783                         } else if (cmdp->cb.cont) {
 784                                 if (cmdp->cb.cont( ctx, cmdp, cmd ))
 785                                         return RESP_BAD;
 786                         } else {
 787                                 fprintf( stderr, "IMAP error: unexpected command continuation request\n" );
 788                                 return RESP_BAD;
 789                         }
 790                         if (socket_write( &imap->buf.sock, "\r\n", 2 ) != 2)
 791                                 return RESP_BAD;
 792                         if (!cmdp->cb.cont)
 793                                 imap->literal_pending = 0;
 794                         if (!tcmd)
 795                                 return DRV_OK;
 796                 } else {
 797                         tag = atoi( arg );
 798                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 799                                 if (cmdp->tag == tag)
 800                                         goto gottag;
 801                         fprintf( stderr, "IMAP error: unexpected tag %s\n", arg );
 802                         return RESP_BAD;
 803                   gottag:
 804                         if (!(*pcmdp = cmdp->next))
 805                                 imap->in_progress_append = pcmdp;
 806                         imap->num_in_progress--;
 807                         if (cmdp->cb.cont || cmdp->cb.data)
 808                                 imap->literal_pending = 0;
 809                         arg = next_arg( &cmd );
 810                         if (!strcmp( "OK", arg ))
 811                                 resp = DRV_OK;
 812                         else {
 813                                 if (!strcmp( "NO", arg )) {
 814                                         if (cmdp->cb.create && cmd && (cmdp->cb.trycreate || !memcmp( cmd, "[TRYCREATE]", 11 ))) { /* SELECT, APPEND or UID COPY */
 815                                                 p = strchr( cmdp->cmd, '"' );
 816                                                 if (!issue_imap_cmd( ctx, NULL, "CREATE \"%.*s\"", strchr( p + 1, '"' ) - p + 1, p )) {
 817                                                         resp = RESP_BAD;
 818                                                         goto normal;
 819                                                 }
 820                                                 /* not waiting here violates the spec, but a server that does not
 821                                                    grok this nonetheless violates it too. */
 822                                                 cmdp->cb.create = 0;
 823                                                 if (!(ncmdp = issue_imap_cmd( ctx, &cmdp->cb, "%s", cmdp->cmd ))) {
 824                                                         resp = RESP_BAD;
 825                                                         goto normal;
 826                                                 }
 827                                                 free( cmdp->cmd );
 828                                                 free( cmdp );
 829                                                 if (!tcmd)
 830                                                         return 0;       /* ignored */
 831                                                 if (cmdp == tcmd)
 832                                                         tcmd = ncmdp;
 833                                                 continue;
 834                                         }
 835                                         resp = RESP_NO;
 836                                 } else /*if (!strcmp( "BAD", arg ))*/
 837                                         resp = RESP_BAD;
 838                                 fprintf( stderr, "IMAP command '%s' returned response (%s) - %s\n",
 839                                          memcmp (cmdp->cmd, "LOGIN", 5) ?
 840                                                         cmdp->cmd : "LOGIN <user> <pass>",
 841                                                         arg, cmd ? cmd : "");
 842                         }
 843                         if ((resp2 = parse_response_code( ctx, &cmdp->cb, cmd )) > resp)
 844                                 resp = resp2;
 845                   normal:
 846                         if (cmdp->cb.done)
 847                                 cmdp->cb.done( ctx, cmdp, resp );
 848                         if (cmdp->cb.data)
 849                                 free( cmdp->cb.data );
 850                         free( cmdp->cmd );
 851                         free( cmdp );
 852                         if (!tcmd || tcmd == cmdp)
 853                                 return resp;
 854                 }
 855         }
 856         /* not reached */
 857 }
 858
 859 static void
 860 imap_close_server( imap_store_t *ictx )
 861 {
 862         imap_t *imap = ictx->imap;
 863
 864         if (imap->buf.sock.fd != -1) {
 865                 imap_exec( ictx, NULL, "LOGOUT" );
 866                 close( imap->buf.sock.fd );
 867         }
 868         free_list( imap->ns_personal );
 869         free_list( imap->ns_other );
 870         free_list( imap->ns_shared );
 871         free( imap );
 872 }
 873
 874 static void
 875 imap_close_store( store_t *ctx )
 876 {
 877         imap_close_server( (imap_store_t *)ctx );
 878         free_generic_messages( ctx->msgs );
 879         free( ctx );
 880 }
 881
 882 static store_t *
 883 imap_open_store( imap_server_conf_t *srvc )
 884 {
 885         imap_store_t *ctx;
 886         imap_t *imap;
 887         char *arg, *rsp;
 888         struct hostent *he;
 889         struct sockaddr_in addr;
 890         int s, a[2], preauth;
 891         pid_t pid;
 892
 893         ctx = xcalloc( sizeof(*ctx), 1 );
 894
 895         ctx->imap = imap = xcalloc( sizeof(*imap), 1 );
 896         imap->buf.sock.fd = -1;
 897         imap->in_progress_append = &imap->in_progress;
 898
 899         /* open connection to IMAP server */
 900
 901         if (srvc->tunnel) {
 902                 imap_info( "Starting tunnel '%s'... ", srvc->tunnel );
 903
 904                 if (socketpair( PF_UNIX, SOCK_STREAM, 0, a )) {
 905                         perror( "socketpair" );
 906                         exit( 1 );
 907                 }
 908
 909                 pid = fork();
 910                 if (pid < 0)
 911                         _exit( 127 );
 912                 if (!pid) {
 913                         if (dup2( a[0], 0 ) == -1 || dup2( a[0], 1 ) == -1)
 914                                 _exit( 127 );
 915                         close( a[0] );
 916                         close( a[1] );
 917                         execl( "/bin/sh", "sh", "-c", srvc->tunnel, NULL );
 918                         _exit( 127 );
 919                 }
 920
 921                 close (a[0]);
 922
 923                 imap->buf.sock.fd = a[1];
 924
 925                 imap_info( "ok\n" );
 926         } else {
 927                 memset( &addr, 0, sizeof(addr) );
 928                 addr.sin_port = htons( srvc->port );
 929                 addr.sin_family = AF_INET;
 930
 931                 imap_info( "Resolving %s... ", srvc->host );
 932                 he = gethostbyname( srvc->host );
 933                 if (!he) {
 934                         perror( "gethostbyname" );
 935                         goto bail;
 936                 }
 937                 imap_info( "ok\n" );
 938
 939                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
 940
 941                 s = socket( PF_INET, SOCK_STREAM, 0 );
 942
 943                 imap_info( "Connecting to %s:%hu... ", inet_ntoa( addr.sin_addr ), ntohs( addr.sin_port ) );
 944                 if (connect( s, (struct sockaddr *)&addr, sizeof(addr) )) {
 945                         close( s );
 946                         perror( "connect" );
 947                         goto bail;
 948                 }
 949                 imap_info( "ok\n" );
 950
 951                 imap->buf.sock.fd = s;
 952
 953         }
 954
 955         /* read the greeting string */
 956         if (buffer_gets( &imap->buf, &rsp )) {
 957                 fprintf( stderr, "IMAP error: no greeting response\n" );
 958                 goto bail;
 959         }
 960         arg = next_arg( &rsp );
 961         if (!arg || *arg != '*' || (arg = next_arg( &rsp )) == NULL) {
 962                 fprintf( stderr, "IMAP error: invalid greeting response\n" );
 963                 goto bail;
 964         }
 965         preauth = 0;
 966         if (!strcmp( "PREAUTH", arg ))
 967                 preauth = 1;
 968         else if (strcmp( "OK", arg ) != 0) {
 969                 fprintf( stderr, "IMAP error: unknown greeting response\n" );
 970                 goto bail;
 971         }
 972         parse_response_code( ctx, NULL, rsp );
 973         if (!imap->caps && imap_exec( ctx, NULL, "CAPABILITY" ) != RESP_OK)
 974                 goto bail;
 975
 976         if (!preauth) {
 977
 978                 imap_info ("Logging in...\n");
 979                 if (!srvc->user) {
 980                         fprintf( stderr, "Skipping server %s, no user\n", srvc->host );
 981                         goto bail;
 982                 }
 983                 if (!srvc->pass) {
 984                         char prompt[80];
 985                         sprintf( prompt, "Password (%s@%s): ", srvc->user, srvc->host );
 986                         arg = getpass( prompt );
 987                         if (!arg) {
 988                                 perror( "getpass" );
 989                                 exit( 1 );
 990                         }
 991                         if (!*arg) {
 992                                 fprintf( stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host );
 993                                 goto bail;
 994                         }
 995                         /*
 996                          * getpass() returns a pointer to a static buffer.  make a copy
 997                          * for long term storage.
 998                          */
 999                         srvc->pass = xstrdup( arg );
1000                 }
1001                 if (CAP(NOLOGIN)) {
1002                         fprintf( stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host );
1003                         goto bail;
1004                 }
1005                 imap_warn( "*** IMAP Warning *** Password is being sent in the clear\n" );
1006                 if (imap_exec( ctx, NULL, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass ) != RESP_OK) {
1007                         fprintf( stderr, "IMAP error: LOGIN failed\n" );
1008                         goto bail;
1009                 }
1010         } /* !preauth */
1011
1012         ctx->prefix = "";
1013         ctx->trashnc = 1;
1014         return (store_t *)ctx;
1015
1016   bail:
1017         imap_close_store( &ctx->gen );
1018         return NULL;
1019 }
1020
1021 static int
1022 imap_make_flags( int flags, char *buf )
1023 {
1024         const char *s;
1025         unsigned i, d;
1026
1027         for (i = d = 0; i < ARRAY_SIZE(Flags); i++)
1028                 if (flags & (1 << i)) {
1029                         buf[d++] = ' ';
1030                         buf[d++] = '\\';
1031                         for (s = Flags[i]; *s; s++)
1032                                 buf[d++] = *s;
1033                 }
1034         buf[0] = '(';
1035         buf[d++] = ')';
1036         return d;
1037 }
1038
1039 #define TUIDL 8
1040
1041 static int
1042 imap_store_msg( store_t *gctx, msg_data_t *data, int *uid )
1043 {
1044         imap_store_t *ctx = (imap_store_t *)gctx;
1045         imap_t *imap = ctx->imap;
1046         struct imap_cmd_cb cb;
1047         char *fmap, *buf;
1048         const char *prefix, *box;
1049         int ret, i, j, d, len, extra, nocr;
1050         int start, sbreak = 0, ebreak = 0;
1051         char flagstr[128], tuid[TUIDL * 2 + 1];
1052
1053         memset( &cb, 0, sizeof(cb) );
1054
1055         fmap = data->data;
1056         len = data->len;
1057         nocr = !data->crlf;
1058         extra = 0, i = 0;
1059         if (!CAP(UIDPLUS) && uid) {
1060           nloop:
1061                 start = i;
1062                 while (i < len)
1063                         if (fmap[i++] == '\n') {
1064                                 extra += nocr;
1065                                 if (i - 2 + nocr == start) {
1066                                         sbreak = ebreak = i - 2 + nocr;
1067                                         goto mktid;
1068                                 }
1069                                 if (!memcmp( fmap + start, "X-TUID: ", 8 )) {
1070                                         extra -= (ebreak = i) - (sbreak = start) + nocr;
1071                                         goto mktid;
1072                                 }
1073                                 goto nloop;
1074                         }
1075                 /* invalid message */
1076                 free( fmap );
1077                 return DRV_MSG_BAD;
1078          mktid:
1079                 for (j = 0; j < TUIDL; j++)
1080                         sprintf( tuid + j * 2, "%02x", arc4_getbyte() );
1081                 extra += 8 + TUIDL * 2 + 2;
1082         }
1083         if (nocr)
1084                 for (; i < len; i++)
1085                         if (fmap[i] == '\n')
1086                                 extra++;
1087
1088         cb.dlen = len + extra;
1089         buf = cb.data = xmalloc( cb.dlen );
1090         i = 0;
1091         if (!CAP(UIDPLUS) && uid) {
1092                 if (nocr) {
1093                         for (; i < sbreak; i++)
1094                                 if (fmap[i] == '\n') {
1095                                         *buf++ = '\r';
1096                                         *buf++ = '\n';
1097                                 } else
1098                                         *buf++ = fmap[i];
1099                 } else {
1100                         memcpy( buf, fmap, sbreak );
1101                         buf += sbreak;
1102                 }
1103                 memcpy( buf, "X-TUID: ", 8 );
1104                 buf += 8;
1105                 memcpy( buf, tuid, TUIDL * 2 );
1106                 buf += TUIDL * 2;
1107                 *buf++ = '\r';
1108                 *buf++ = '\n';
1109                 i = ebreak;
1110         }
1111         if (nocr) {
1112                 for (; i < len; i++)
1113                         if (fmap[i] == '\n') {
1114                                 *buf++ = '\r';
1115                                 *buf++ = '\n';
1116                         } else
1117                                 *buf++ = fmap[i];
1118         } else
1119                 memcpy( buf, fmap + i, len - i );
1120
1121         free( fmap );
1122
1123         d = 0;
1124         if (data->flags) {
1125                 d = imap_make_flags( data->flags, flagstr );
1126                 flagstr[d++] = ' ';
1127         }
1128         flagstr[d] = 0;
1129
1130         if (!uid) {
1131                 box = gctx->conf->trash;
1132                 prefix = ctx->prefix;
1133                 cb.create = 1;
1134                 if (ctx->trashnc)
1135                         imap->caps = imap->rcaps & ~(1 << LITERALPLUS);
1136         } else {
1137                 box = gctx->name;
1138                 prefix = !strcmp( box, "INBOX" ) ? "" : ctx->prefix;
1139                 cb.create = 0;
1140         }
1141         cb.ctx = uid;
1142         ret = imap_exec_m( ctx, &cb, "APPEND \"%s%s\" %s", prefix, box, flagstr );
1143         imap->caps = imap->rcaps;
1144         if (ret != DRV_OK)
1145                 return ret;
1146         if (!uid)
1147                 ctx->trashnc = 0;
1148         else
1149                 gctx->count++;
1150
1151         return DRV_OK;
1152 }
1153
1154 #define CHUNKSIZE 0x1000
1155
1156 static int
1157 read_message( FILE *f, msg_data_t *msg )
1158 {
1159         struct strbuf buf;
1160
1161         memset(msg, 0, sizeof(*msg));
1162         strbuf_init(&buf, 0);
1163
1164         do {
1165                 if (strbuf_fread(&buf, CHUNKSIZE, f) <= 0)
1166                         break;
1167         } while (!feof(f));
1168
1169         msg->len  = buf.len;
1170         msg->data = strbuf_detach(&buf);
1171         return msg->len;
1172 }
1173
1174 static int
1175 count_messages( msg_data_t *msg )
1176 {
1177         int count = 0;
1178         char *p = msg->data;
1179
1180         while (1) {
1181                 if (!prefixcmp(p, "From ")) {
1182                         count++;
1183                         p += 5;
1184                 }
1185                 p = strstr( p+5, "\nFrom ");
1186                 if (!p)
1187                         break;
1188                 p++;
1189         }
1190         return count;
1191 }
1192
1193 static int
1194 split_msg( msg_data_t *all_msgs, msg_data_t *msg, int *ofs )
1195 {
1196         char *p, *data;
1197
1198         memset( msg, 0, sizeof *msg );
1199         if (*ofs >= all_msgs->len)
1200                 return 0;
1201
1202         data = &all_msgs->data[ *ofs ];
1203         msg->len = all_msgs->len - *ofs;
1204
1205         if (msg->len < 5 || prefixcmp(data, "From "))
1206                 return 0;
1207
1208         p = strchr( data, '\n' );
1209         if (p) {
1210                 p = &p[1];
1211                 msg->len -= p-data;
1212                 *ofs += p-data;
1213                 data = p;
1214         }
1215
1216         p = strstr( data, "\nFrom " );
1217         if (p)
1218                 msg->len = &p[1] - data;
1219
1220         msg->data = xmemdupz(data, msg->len);
1221         *ofs += msg->len;
1222         return 1;
1223 }
1224
1225 static imap_server_conf_t server =
1226 {
1227         NULL,   /* name */
1228         NULL,   /* tunnel */
1229         NULL,   /* host */
1230         0,      /* port */
1231         NULL,   /* user */
1232         NULL,   /* pass */
1233 };
1234
1235 static char *imap_folder;
1236
1237 static int
1238 git_imap_config(const char *key, const char *val)
1239 {
1240         char imap_key[] = "imap.";
1241
1242         if (strncmp( key, imap_key, sizeof imap_key - 1 ))
1243                 return 0;
1244         key += sizeof imap_key - 1;
1245
1246         if (!strcmp( "folder", key )) {
1247                 imap_folder = xstrdup( val );
1248         } else if (!strcmp( "host", key )) {
1249                 {
1250                         if (!prefixcmp(val, "imap:"))
1251                                 val += 5;
1252                         if (!server.port)
1253                                 server.port = 143;
1254                 }
1255                 if (!prefixcmp(val, "//"))
1256                         val += 2;
1257                 server.host = xstrdup( val );
1258         }
1259         else if (!strcmp( "user", key ))
1260                 server.user = xstrdup( val );
1261         else if (!strcmp( "pass", key ))
1262                 server.pass = xstrdup( val );
1263         else if (!strcmp( "port", key ))
1264                 server.port = git_config_int( key, val );
1265         else if (!strcmp( "tunnel", key ))
1266                 server.tunnel = xstrdup( val );
1267         return 0;
1268 }
1269
1270 int
1271 main(int argc, char **argv)
1272 {
1273         msg_data_t all_msgs, msg;
1274         store_t *ctx = NULL;
1275         int uid = 0;
1276         int ofs = 0;
1277         int r;
1278         int total, n = 0;
1279
1280         /* init the random number generator */
1281         arc4_init();
1282
1283         git_config( git_imap_config );
1284
1285         if (!imap_folder) {
1286                 fprintf( stderr, "no imap store specified\n" );
1287                 return 1;
1288         }
1289
1290         /* read the messages */
1291         if (!read_message( stdin, &all_msgs )) {
1292                 fprintf(stderr,"nothing to send\n");
1293                 return 1;
1294         }
1295
1296         total = count_messages( &all_msgs );
1297         if (!total) {
1298                 fprintf(stderr,"no messages to send\n");
1299                 return 1;
1300         }
1301
1302         /* write it to the imap server */
1303         ctx = imap_open_store( &server );
1304         if (!ctx) {
1305                 fprintf( stderr,"failed to open store\n");
1306                 return 1;
1307         }
1308
1309         fprintf( stderr, "sending %d message%s\n", total, (total!=1)?"s":"" );
1310         ctx->name = imap_folder;
1311         while (1) {
1312                 unsigned percent = n * 100 / total;
1313                 fprintf( stderr, "%4u%% (%d/%d) done\r", percent, n, total );
1314                 if (!split_msg( &all_msgs, &msg, &ofs ))
1315                         break;
1316                 r = imap_store_msg( ctx, &msg, &uid );
1317                 if (r != DRV_OK) break;
1318                 n++;
1319         }
1320         fprintf( stderr,"\n" );
1321
1322         imap_close_store( ctx );
1323
1324         return 0;
1325 }