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 #include <assert.h>
  28 #include <netinet/in.h>
  29 #include <netinet/tcp.h>
  30 #include <arpa/inet.h>
  31 #include <sys/socket.h>
  32 #include <netdb.h>
  33
  34 typedef struct store_conf {
  35         char *name;
  36         const char *path; /* should this be here? its interpretation is driver-specific */
  37         char *map_inbox;
  38         char *trash;
  39         unsigned max_size; /* off_t is overkill */
  40         unsigned trash_remote_new:1, trash_only_new:1;
  41 } store_conf_t;
  42
  43 typedef struct string_list {
  44         struct string_list *next;
  45         char string[1];
  46 } string_list_t;
  47
  48 typedef struct channel_conf {
  49         struct channel_conf *next;
  50         char *name;
  51         store_conf_t *master, *slave;
  52         char *master_name, *slave_name;
  53         char *sync_state;
  54         string_list_t *patterns;
  55         int mops, sops;
  56         unsigned max_messages; /* for slave only */
  57 } channel_conf_t;
  58
  59 typedef struct group_conf {
  60         struct group_conf *next;
  61         char *name;
  62         string_list_t *channels;
  63 } group_conf_t;
  64
  65 /* For message->status */
  66 #define M_RECENT       (1<<0) /* unsyncable flag; maildir_* depend on this being 1<<0 */
  67 #define M_DEAD         (1<<1) /* expunged */
  68 #define M_FLAGS        (1<<2) /* flags fetched */
  69
  70 typedef struct message {
  71         struct message *next;
  72         /* string_list_t *keywords; */
  73         size_t size; /* zero implies "not fetched" */
  74         int uid;
  75         unsigned char flags, status;
  76 } message_t;
  77
  78 typedef struct store {
  79         store_conf_t *conf; /* foreign */
  80
  81         /* currently open mailbox */
  82         const char *name; /* foreign! maybe preset? */
  83         char *path; /* own */
  84         message_t *msgs; /* own */
  85         int uidvalidity;
  86         unsigned char opts; /* maybe preset? */
  87         /* note that the following do _not_ reflect stats from msgs, but mailbox totals */
  88         int count; /* # of messages */
  89         int recent; /* # of recent messages - don't trust this beyond the initial read */
  90 } store_t;
  91
  92 typedef struct {
  93         char *data;
  94         int len;
  95         unsigned char flags;
  96         unsigned char crlf:1;
  97 } msg_data_t;
  98
  99 #define DRV_OK          0
 100 #define DRV_MSG_BAD     -1
 101 #define DRV_BOX_BAD     -2
 102 #define DRV_STORE_BAD   -3
 103
 104 static int Verbose, Quiet;
 105
 106 static void info( const char *, ... );
 107 static void warn( const char *, ... );
 108
 109 static char *next_arg( char ** );
 110
 111 static void free_generic_messages( message_t * );
 112
 113 static int nfvasprintf( char **str, const char *fmt, va_list va );
 114 static int nfsnprintf( char *buf, int blen, const char *fmt, ... );
 115
 116
 117 static void arc4_init( void );
 118 static unsigned char arc4_getbyte( void );
 119
 120 typedef struct imap_server_conf {
 121         char *name;
 122         char *tunnel;
 123         char *host;
 124         int port;
 125         char *user;
 126         char *pass;
 127 } imap_server_conf_t;
 128
 129 typedef struct imap_store_conf {
 130         store_conf_t gen;
 131         imap_server_conf_t *server;
 132         unsigned use_namespace:1;
 133 } imap_store_conf_t;
 134
 135 #define NIL     (void*)0x1
 136 #define LIST    (void*)0x2
 137
 138 typedef struct _list {
 139         struct _list *next, *child;
 140         char *val;
 141         int len;
 142 } list_t;
 143
 144 typedef struct {
 145         int fd;
 146 } Socket_t;
 147
 148 typedef struct {
 149         Socket_t sock;
 150         int bytes;
 151         int offset;
 152         char buf[1024];
 153 } buffer_t;
 154
 155 struct imap_cmd;
 156
 157 typedef struct imap {
 158         int uidnext; /* from SELECT responses */
 159         list_t *ns_personal, *ns_other, *ns_shared; /* NAMESPACE info */
 160         unsigned caps, rcaps; /* CAPABILITY results */
 161         /* command queue */
 162         int nexttag, num_in_progress, literal_pending;
 163         struct imap_cmd *in_progress, **in_progress_append;
 164         buffer_t buf; /* this is BIG, so put it last */
 165 } imap_t;
 166
 167 typedef struct imap_store {
 168         store_t gen;
 169         int uidvalidity;
 170         imap_t *imap;
 171         const char *prefix;
 172         unsigned /*currentnc:1,*/ trashnc:1;
 173 } imap_store_t;
 174
 175 struct imap_cmd_cb {
 176         int (*cont)( imap_store_t *ctx, struct imap_cmd *cmd, const char *prompt );
 177         void (*done)( imap_store_t *ctx, struct imap_cmd *cmd, int response);
 178         void *ctx;
 179         char *data;
 180         int dlen;
 181         int uid;
 182         unsigned create:1, trycreate:1;
 183 };
 184
 185 struct imap_cmd {
 186         struct imap_cmd *next;
 187         struct imap_cmd_cb cb;
 188         char *cmd;
 189         int tag;
 190 };
 191
 192 #define CAP(cap) (imap->caps & (1 << (cap)))
 193
 194 enum CAPABILITY {
 195         NOLOGIN = 0,
 196         UIDPLUS,
 197         LITERALPLUS,
 198         NAMESPACE,
 199 };
 200
 201 static const char *cap_list[] = {
 202         "LOGINDISABLED",
 203         "UIDPLUS",
 204         "LITERAL+",
 205         "NAMESPACE",
 206 };
 207
 208 #define RESP_OK    0
 209 #define RESP_NO    1
 210 #define RESP_BAD   2
 211
 212 static int get_cmd_result( imap_store_t *ctx, struct imap_cmd *tcmd );
 213
 214
 215 static const char *Flags[] = {
 216         "Draft",
 217         "Flagged",
 218         "Answered",
 219         "Seen",
 220         "Deleted",
 221 };
 222
 223 static void
 224 socket_perror( const char *func, Socket_t *sock, int ret )
 225 {
 226         if (ret < 0)
 227                 perror( func );
 228         else
 229                 fprintf( stderr, "%s: unexpected EOF\n", func );
 230 }
 231
 232 static int
 233 socket_read( Socket_t *sock, char *buf, int len )
 234 {
 235         int n = read( sock->fd, buf, len );
 236         if (n <= 0) {
 237                 socket_perror( "read", sock, n );
 238                 close( sock->fd );
 239                 sock->fd = -1;
 240         }
 241         return n;
 242 }
 243
 244 static int
 245 socket_write( Socket_t *sock, char *buf, int len )
 246 {
 247         int n = write( sock->fd, buf, len );
 248         if (n != len) {
 249                 socket_perror( "write", sock, n );
 250                 close( sock->fd );
 251                 sock->fd = -1;
 252         }
 253         return n;
 254 }
 255
 256 /* simple line buffering */
 257 static int
 258 buffer_gets( buffer_t * b, char **s )
 259 {
 260         int n;
 261         int start = b->offset;
 262
 263         *s = b->buf + start;
 264
 265         for (;;) {
 266                 /* make sure we have enough data to read the \r\n sequence */
 267                 if (b->offset + 1 >= b->bytes) {
 268                         if (start) {
 269                                 /* shift down used bytes */
 270                                 *s = b->buf;
 271
 272                                 assert( start <= b->bytes );
 273                                 n = b->bytes - start;
 274
 275                                 if (n)
 276                                         memcpy( b->buf, b->buf + start, n );
 277                                 b->offset -= start;
 278                                 b->bytes = n;
 279                                 start = 0;
 280                         }
 281
 282                         n = socket_read( &b->sock, b->buf + b->bytes,
 283                                          sizeof(b->buf) - b->bytes );
 284
 285                         if (n <= 0)
 286                                 return -1;
 287
 288                         b->bytes += n;
 289                 }
 290
 291                 if (b->buf[b->offset] == '\r') {
 292                         assert( b->offset + 1 < b->bytes );
 293                         if (b->buf[b->offset + 1] == '\n') {
 294                                 b->buf[b->offset] = 0;  /* terminate the string */
 295                                 b->offset += 2; /* next line */
 296                                 if (Verbose)
 297                                         puts( *s );
 298                                 return 0;
 299                         }
 300                 }
 301
 302                 b->offset++;
 303         }
 304         /* not reached */
 305 }
 306
 307 static void
 308 info( const char *msg, ... )
 309 {
 310         va_list va;
 311
 312         if (!Quiet) {
 313                 va_start( va, msg );
 314                 vprintf( msg, va );
 315                 va_end( va );
 316                 fflush( stdout );
 317         }
 318 }
 319
 320 static void
 321 warn( const char *msg, ... )
 322 {
 323         va_list va;
 324
 325         if (Quiet < 2) {
 326                 va_start( va, msg );
 327                 vfprintf( stderr, msg, va );
 328                 va_end( va );
 329         }
 330 }
 331
 332 static char *
 333 next_arg( char **s )
 334 {
 335         char *ret;
 336
 337         if (!s || !*s)
 338                 return 0;
 339         while (isspace( (unsigned char) **s ))
 340                 (*s)++;
 341         if (!**s) {
 342                 *s = 0;
 343                 return 0;
 344         }
 345         if (**s == '"') {
 346                 ++*s;
 347                 ret = *s;
 348                 *s = strchr( *s, '"' );
 349         } else {
 350                 ret = *s;
 351                 while (**s && !isspace( (unsigned char) **s ))
 352                         (*s)++;
 353         }
 354         if (*s) {
 355                 if (**s)
 356                         *(*s)++ = 0;
 357                 if (!**s)
 358                         *s = 0;
 359         }
 360         return ret;
 361 }
 362
 363 static void
 364 free_generic_messages( message_t *msgs )
 365 {
 366         message_t *tmsg;
 367
 368         for (; msgs; msgs = tmsg) {
 369                 tmsg = msgs->next;
 370                 free( msgs );
 371         }
 372 }
 373
 374 static int
 375 vasprintf( char **strp, const char *fmt, va_list ap )
 376 {
 377         int len;
 378         char tmp[1024];
 379
 380         if ((len = vsnprintf( tmp, sizeof(tmp), fmt, ap )) < 0 || !(*strp = xmalloc( len + 1 )))
 381                 return -1;
 382         if (len >= (int)sizeof(tmp))
 383                 vsprintf( *strp, fmt, ap );
 384         else
 385                 memcpy( *strp, tmp, len + 1 );
 386         return len;
 387 }
 388
 389 static int
 390 nfsnprintf( char *buf, int blen, const char *fmt, ... )
 391 {
 392         int ret;
 393         va_list va;
 394
 395         va_start( va, fmt );
 396         if (blen <= 0 || (unsigned)(ret = vsnprintf( buf, blen, fmt, va )) >= (unsigned)blen)
 397                 die( "Fatal: buffer too small. Please report a bug.\n");
 398         va_end( va );
 399         return ret;
 400 }
 401
 402 static int
 403 nfvasprintf( char **str, const char *fmt, va_list va )
 404 {
 405         int ret = vasprintf( str, fmt, va );
 406         if (ret < 0)
 407                 die( "Fatal: Out of memory\n");
 408         return ret;
 409 }
 410
 411 static struct {
 412         unsigned char i, j, s[256];
 413 } rs;
 414
 415 static void
 416 arc4_init( void )
 417 {
 418         int i, fd;
 419         unsigned char j, si, dat[128];
 420
 421         if ((fd = open( "/dev/urandom", O_RDONLY )) < 0 && (fd = open( "/dev/random", O_RDONLY )) < 0) {
 422                 fprintf( stderr, "Fatal: no random number source available.\n" );
 423                 exit( 3 );
 424         }
 425         if (read( fd, dat, 128 ) != 128) {
 426                 fprintf( stderr, "Fatal: cannot read random number source.\n" );
 427                 exit( 3 );
 428         }
 429         close( fd );
 430
 431         for (i = 0; i < 256; i++)
 432                 rs.s[i] = i;
 433         for (i = j = 0; i < 256; i++) {
 434                 si = rs.s[i];
 435                 j += si + dat[i & 127];
 436                 rs.s[i] = rs.s[j];
 437                 rs.s[j] = si;
 438         }
 439         rs.i = rs.j = 0;
 440
 441         for (i = 0; i < 256; i++)
 442                 arc4_getbyte();
 443 }
 444
 445 static unsigned char
 446 arc4_getbyte( void )
 447 {
 448         unsigned char si, sj;
 449
 450         rs.i++;
 451         si = rs.s[rs.i];
 452         rs.j += si;
 453         sj = rs.s[rs.j];
 454         rs.s[rs.i] = sj;
 455         rs.s[rs.j] = si;
 456         return rs.s[(si + sj) & 0xff];
 457 }
 458
 459 static struct imap_cmd *
 460 v_issue_imap_cmd( imap_store_t *ctx, struct imap_cmd_cb *cb,
 461                   const char *fmt, va_list ap )
 462 {
 463         imap_t *imap = ctx->imap;
 464         struct imap_cmd *cmd;
 465         int n, bufl;
 466         char buf[1024];
 467
 468         cmd = xmalloc( sizeof(struct imap_cmd) );
 469         nfvasprintf( &cmd->cmd, fmt, ap );
 470         cmd->tag = ++imap->nexttag;
 471
 472         if (cb)
 473                 cmd->cb = *cb;
 474         else
 475                 memset( &cmd->cb, 0, sizeof(cmd->cb) );
 476
 477         while (imap->literal_pending)
 478                 get_cmd_result( ctx, 0 );
 479
 480         bufl = nfsnprintf( buf, sizeof(buf), cmd->cb.data ? CAP(LITERALPLUS) ?
 481                            "%d %s{%d+}\r\n" : "%d %s{%d}\r\n" : "%d %s\r\n",
 482                            cmd->tag, cmd->cmd, cmd->cb.dlen );
 483         if (Verbose) {
 484                 if (imap->num_in_progress)
 485                         printf( "(%d in progress) ", imap->num_in_progress );
 486                 if (memcmp( cmd->cmd, "LOGIN", 5 ))
 487                         printf( ">>> %s", buf );
 488                 else
 489                         printf( ">>> %d LOGIN <user> <pass>\n", cmd->tag );
 490         }
 491         if (socket_write( &imap->buf.sock, buf, bufl ) != bufl) {
 492                 free( cmd->cmd );
 493                 free( cmd );
 494                 if (cb && cb->data)
 495                         free( cb->data );
 496                 return NULL;
 497         }
 498         if (cmd->cb.data) {
 499                 if (CAP(LITERALPLUS)) {
 500                         n = socket_write( &imap->buf.sock, cmd->cb.data, cmd->cb.dlen );
 501                         free( cmd->cb.data );
 502                         if (n != cmd->cb.dlen ||
 503                             (n = socket_write( &imap->buf.sock, "\r\n", 2 )) != 2)
 504                         {
 505                                 free( cmd->cmd );
 506                                 free( cmd );
 507                                 return NULL;
 508                         }
 509                         cmd->cb.data = 0;
 510                 } else
 511                         imap->literal_pending = 1;
 512         } else if (cmd->cb.cont)
 513                 imap->literal_pending = 1;
 514         cmd->next = 0;
 515         *imap->in_progress_append = cmd;
 516         imap->in_progress_append = &cmd->next;
 517         imap->num_in_progress++;
 518         return cmd;
 519 }
 520
 521 static struct imap_cmd *
 522 issue_imap_cmd( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 523 {
 524         struct imap_cmd *ret;
 525         va_list ap;
 526
 527         va_start( ap, fmt );
 528         ret = v_issue_imap_cmd( ctx, cb, fmt, ap );
 529         va_end( ap );
 530         return ret;
 531 }
 532
 533 static int
 534 imap_exec( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 535 {
 536         va_list ap;
 537         struct imap_cmd *cmdp;
 538
 539         va_start( ap, fmt );
 540         cmdp = v_issue_imap_cmd( ctx, cb, fmt, ap );
 541         va_end( ap );
 542         if (!cmdp)
 543                 return RESP_BAD;
 544
 545         return get_cmd_result( ctx, cmdp );
 546 }
 547
 548 static int
 549 imap_exec_m( imap_store_t *ctx, struct imap_cmd_cb *cb, const char *fmt, ... )
 550 {
 551         va_list ap;
 552         struct imap_cmd *cmdp;
 553
 554         va_start( ap, fmt );
 555         cmdp = v_issue_imap_cmd( ctx, cb, fmt, ap );
 556         va_end( ap );
 557         if (!cmdp)
 558                 return DRV_STORE_BAD;
 559
 560         switch (get_cmd_result( ctx, cmdp )) {
 561         case RESP_BAD: return DRV_STORE_BAD;
 562         case RESP_NO: return DRV_MSG_BAD;
 563         default: return DRV_OK;
 564         }
 565 }
 566
 567 static int
 568 is_atom( list_t *list )
 569 {
 570         return list && list->val && list->val != NIL && list->val != LIST;
 571 }
 572
 573 static int
 574 is_list( list_t *list )
 575 {
 576         return list && list->val == LIST;
 577 }
 578
 579 static void
 580 free_list( list_t *list )
 581 {
 582         list_t *tmp;
 583
 584         for (; list; list = tmp) {
 585                 tmp = list->next;
 586                 if (is_list( list ))
 587                         free_list( list->child );
 588                 else if (is_atom( list ))
 589                         free( list->val );
 590                 free( list );
 591         }
 592 }
 593
 594 static int
 595 parse_imap_list_l( imap_t *imap, char **sp, list_t **curp, int level )
 596 {
 597         list_t *cur;
 598         char *s = *sp, *p;
 599         int n, bytes;
 600
 601         for (;;) {
 602                 while (isspace( (unsigned char)*s ))
 603                         s++;
 604                 if (level && *s == ')') {
 605                         s++;
 606                         break;
 607                 }
 608                 *curp = cur = xmalloc( sizeof(*cur) );
 609                 curp = &cur->next;
 610                 cur->val = 0; /* for clean bail */
 611                 if (*s == '(') {
 612                         /* sublist */
 613                         s++;
 614                         cur->val = LIST;
 615                         if (parse_imap_list_l( imap, &s, &cur->child, level + 1 ))
 616                                 goto bail;
 617                 } else if (imap && *s == '{') {
 618                         /* literal */
 619                         bytes = cur->len = strtol( s + 1, &s, 10 );
 620                         if (*s != '}')
 621                                 goto bail;
 622
 623                         s = cur->val = xmalloc( cur->len );
 624
 625                         /* dump whats left over in the input buffer */
 626                         n = imap->buf.bytes - imap->buf.offset;
 627
 628                         if (n > bytes)
 629                                 /* the entire message fit in the buffer */
 630                                 n = bytes;
 631
 632                         memcpy( s, imap->buf.buf + imap->buf.offset, n );
 633                         s += n;
 634                         bytes -= n;
 635
 636                         /* mark that we used part of the buffer */
 637                         imap->buf.offset += n;
 638
 639                         /* now read the rest of the message */
 640                         while (bytes > 0) {
 641                                 if ((n = socket_read (&imap->buf.sock, s, bytes)) <= 0)
 642                                         goto bail;
 643                                 s += n;
 644                                 bytes -= n;
 645                         }
 646
 647                         if (buffer_gets( &imap->buf, &s ))
 648                                 goto bail;
 649                 } else if (*s == '"') {
 650                         /* quoted string */
 651                         s++;
 652                         p = s;
 653                         for (; *s != '"'; s++)
 654                                 if (!*s)
 655                                         goto bail;
 656                         cur->len = s - p;
 657                         s++;
 658                         cur->val = xmalloc( cur->len + 1 );
 659                         memcpy( cur->val, p, cur->len );
 660                         cur->val[cur->len] = 0;
 661                 } else {
 662                         /* atom */
 663                         p = s;
 664                         for (; *s && !isspace( (unsigned char)*s ); s++)
 665                                 if (level && *s == ')')
 666                                         break;
 667                         cur->len = s - p;
 668                         if (cur->len == 3 && !memcmp ("NIL", p, 3))
 669                                 cur->val = NIL;
 670                         else {
 671                                 cur->val = xmalloc( cur->len + 1 );
 672                                 memcpy( cur->val, p, cur->len );
 673                                 cur->val[cur->len] = 0;
 674                         }
 675                 }
 676
 677                 if (!level)
 678                         break;
 679                 if (!*s)
 680                         goto bail;
 681         }
 682         *sp = s;
 683         *curp = 0;
 684         return 0;
 685
 686   bail:
 687         *curp = 0;
 688         return -1;
 689 }
 690
 691 static list_t *
 692 parse_imap_list( imap_t *imap, char **sp )
 693 {
 694         list_t *head;
 695
 696         if (!parse_imap_list_l( imap, sp, &head, 0 ))
 697                 return head;
 698         free_list( head );
 699         return NULL;
 700 }
 701
 702 static list_t *
 703 parse_list( char **sp )
 704 {
 705         return parse_imap_list( 0, sp );
 706 }
 707
 708 static void
 709 parse_capability( imap_t *imap, char *cmd )
 710 {
 711         char *arg;
 712         unsigned i;
 713
 714         imap->caps = 0x80000000;
 715         while ((arg = next_arg( &cmd )))
 716                 for (i = 0; i < ARRAY_SIZE(cap_list); i++)
 717                         if (!strcmp( cap_list[i], arg ))
 718                                 imap->caps |= 1 << i;
 719         imap->rcaps = imap->caps;
 720 }
 721
 722 static int
 723 parse_response_code( imap_store_t *ctx, struct imap_cmd_cb *cb, char *s )
 724 {
 725         imap_t *imap = ctx->imap;
 726         char *arg, *p;
 727
 728         if (*s != '[')
 729                 return RESP_OK;         /* no response code */
 730         s++;
 731         if (!(p = strchr( s, ']' ))) {
 732                 fprintf( stderr, "IMAP error: malformed response code\n" );
 733                 return RESP_BAD;
 734         }
 735         *p++ = 0;
 736         arg = next_arg( &s );
 737         if (!strcmp( "UIDVALIDITY", arg )) {
 738                 if (!(arg = next_arg( &s )) || !(ctx->gen.uidvalidity = atoi( arg ))) {
 739                         fprintf( stderr, "IMAP error: malformed UIDVALIDITY status\n" );
 740                         return RESP_BAD;
 741                 }
 742         } else if (!strcmp( "UIDNEXT", arg )) {
 743                 if (!(arg = next_arg( &s )) || !(imap->uidnext = atoi( arg ))) {
 744                         fprintf( stderr, "IMAP error: malformed NEXTUID status\n" );
 745                         return RESP_BAD;
 746                 }
 747         } else if (!strcmp( "CAPABILITY", arg )) {
 748                 parse_capability( imap, s );
 749         } else if (!strcmp( "ALERT", arg )) {
 750                 /* RFC2060 says that these messages MUST be displayed
 751                  * to the user
 752                  */
 753                 for (; isspace( (unsigned char)*p ); p++);
 754                 fprintf( stderr, "*** IMAP ALERT *** %s\n", p );
 755         } else if (cb && cb->ctx && !strcmp( "APPENDUID", arg )) {
 756                 if (!(arg = next_arg( &s )) || !(ctx->gen.uidvalidity = atoi( arg )) ||
 757                     !(arg = next_arg( &s )) || !(*(int *)cb->ctx = atoi( arg )))
 758                 {
 759                         fprintf( stderr, "IMAP error: malformed APPENDUID status\n" );
 760                         return RESP_BAD;
 761                 }
 762         }
 763         return RESP_OK;
 764 }
 765
 766 static int
 767 get_cmd_result( imap_store_t *ctx, struct imap_cmd *tcmd )
 768 {
 769         imap_t *imap = ctx->imap;
 770         struct imap_cmd *cmdp, **pcmdp, *ncmdp;
 771         char *cmd, *arg, *arg1, *p;
 772         int n, resp, resp2, tag;
 773
 774         for (;;) {
 775                 if (buffer_gets( &imap->buf, &cmd ))
 776                         return RESP_BAD;
 777
 778                 arg = next_arg( &cmd );
 779                 if (*arg == '*') {
 780                         arg = next_arg( &cmd );
 781                         if (!arg) {
 782                                 fprintf( stderr, "IMAP error: unable to parse untagged response\n" );
 783                                 return RESP_BAD;
 784                         }
 785
 786                         if (!strcmp( "NAMESPACE", arg )) {
 787                                 imap->ns_personal = parse_list( &cmd );
 788                                 imap->ns_other = parse_list( &cmd );
 789                                 imap->ns_shared = parse_list( &cmd );
 790                         } else if (!strcmp( "OK", arg ) || !strcmp( "BAD", arg ) ||
 791                                    !strcmp( "NO", arg ) || !strcmp( "BYE", arg )) {
 792                                 if ((resp = parse_response_code( ctx, 0, cmd )) != RESP_OK)
 793                                         return resp;
 794                         } else if (!strcmp( "CAPABILITY", arg ))
 795                                 parse_capability( imap, cmd );
 796                         else if ((arg1 = next_arg( &cmd ))) {
 797                                 if (!strcmp( "EXISTS", arg1 ))
 798                                         ctx->gen.count = atoi( arg );
 799                                 else if (!strcmp( "RECENT", arg1 ))
 800                                         ctx->gen.recent = atoi( arg );
 801                         } else {
 802                                 fprintf( stderr, "IMAP error: unable to parse untagged response\n" );
 803                                 return RESP_BAD;
 804                         }
 805                 } else if (!imap->in_progress) {
 806                         fprintf( stderr, "IMAP error: unexpected reply: %s %s\n", arg, cmd ? cmd : "" );
 807                         return RESP_BAD;
 808                 } else if (*arg == '+') {
 809                         /* This can happen only with the last command underway, as
 810                            it enforces a round-trip. */
 811                         cmdp = (struct imap_cmd *)((char *)imap->in_progress_append -
 812                                offsetof(struct imap_cmd, next));
 813                         if (cmdp->cb.data) {
 814                                 n = socket_write( &imap->buf.sock, cmdp->cb.data, cmdp->cb.dlen );
 815                                 free( cmdp->cb.data );
 816                                 cmdp->cb.data = 0;
 817                                 if (n != (int)cmdp->cb.dlen)
 818                                         return RESP_BAD;
 819                         } else if (cmdp->cb.cont) {
 820                                 if (cmdp->cb.cont( ctx, cmdp, cmd ))
 821                                         return RESP_BAD;
 822                         } else {
 823                                 fprintf( stderr, "IMAP error: unexpected command continuation request\n" );
 824                                 return RESP_BAD;
 825                         }
 826                         if (socket_write( &imap->buf.sock, "\r\n", 2 ) != 2)
 827                                 return RESP_BAD;
 828                         if (!cmdp->cb.cont)
 829                                 imap->literal_pending = 0;
 830                         if (!tcmd)
 831                                 return DRV_OK;
 832                 } else {
 833                         tag = atoi( arg );
 834                         for (pcmdp = &imap->in_progress; (cmdp = *pcmdp); pcmdp = &cmdp->next)
 835                                 if (cmdp->tag == tag)
 836                                         goto gottag;
 837                         fprintf( stderr, "IMAP error: unexpected tag %s\n", arg );
 838                         return RESP_BAD;
 839                   gottag:
 840                         if (!(*pcmdp = cmdp->next))
 841                                 imap->in_progress_append = pcmdp;
 842                         imap->num_in_progress--;
 843                         if (cmdp->cb.cont || cmdp->cb.data)
 844                                 imap->literal_pending = 0;
 845                         arg = next_arg( &cmd );
 846                         if (!strcmp( "OK", arg ))
 847                                 resp = DRV_OK;
 848                         else {
 849                                 if (!strcmp( "NO", arg )) {
 850                                         if (cmdp->cb.create && cmd && (cmdp->cb.trycreate || !memcmp( cmd, "[TRYCREATE]", 11 ))) { /* SELECT, APPEND or UID COPY */
 851                                                 p = strchr( cmdp->cmd, '"' );
 852                                                 if (!issue_imap_cmd( ctx, 0, "CREATE \"%.*s\"", strchr( p + 1, '"' ) - p + 1, p )) {
 853                                                         resp = RESP_BAD;
 854                                                         goto normal;
 855                                                 }
 856                                                 /* not waiting here violates the spec, but a server that does not
 857                                                    grok this nonetheless violates it too. */
 858                                                 cmdp->cb.create = 0;
 859                                                 if (!(ncmdp = issue_imap_cmd( ctx, &cmdp->cb, "%s", cmdp->cmd ))) {
 860                                                         resp = RESP_BAD;
 861                                                         goto normal;
 862                                                 }
 863                                                 free( cmdp->cmd );
 864                                                 free( cmdp );
 865                                                 if (!tcmd)
 866                                                         return 0;       /* ignored */
 867                                                 if (cmdp == tcmd)
 868                                                         tcmd = ncmdp;
 869                                                 continue;
 870                                         }
 871                                         resp = RESP_NO;
 872                                 } else /*if (!strcmp( "BAD", arg ))*/
 873                                         resp = RESP_BAD;
 874                                 fprintf( stderr, "IMAP command '%s' returned response (%s) - %s\n",
 875                                          memcmp (cmdp->cmd, "LOGIN", 5) ?
 876                                                         cmdp->cmd : "LOGIN <user> <pass>",
 877                                                         arg, cmd ? cmd : "");
 878                         }
 879                         if ((resp2 = parse_response_code( ctx, &cmdp->cb, cmd )) > resp)
 880                                 resp = resp2;
 881                   normal:
 882                         if (cmdp->cb.done)
 883                                 cmdp->cb.done( ctx, cmdp, resp );
 884                         if (cmdp->cb.data)
 885                                 free( cmdp->cb.data );
 886                         free( cmdp->cmd );
 887                         free( cmdp );
 888                         if (!tcmd || tcmd == cmdp)
 889                                 return resp;
 890                 }
 891         }
 892         /* not reached */
 893 }
 894
 895 static void
 896 imap_close_server( imap_store_t *ictx )
 897 {
 898         imap_t *imap = ictx->imap;
 899
 900         if (imap->buf.sock.fd != -1) {
 901                 imap_exec( ictx, 0, "LOGOUT" );
 902                 close( imap->buf.sock.fd );
 903         }
 904         free_list( imap->ns_personal );
 905         free_list( imap->ns_other );
 906         free_list( imap->ns_shared );
 907         free( imap );
 908 }
 909
 910 static void
 911 imap_close_store( store_t *ctx )
 912 {
 913         imap_close_server( (imap_store_t *)ctx );
 914         free_generic_messages( ctx->msgs );
 915         free( ctx );
 916 }
 917
 918 static store_t *
 919 imap_open_store( imap_server_conf_t *srvc )
 920 {
 921         imap_store_t *ctx;
 922         imap_t *imap;
 923         char *arg, *rsp;
 924         struct hostent *he;
 925         struct sockaddr_in addr;
 926         int s, a[2], preauth;
 927
 928         ctx = xcalloc( sizeof(*ctx), 1 );
 929
 930         ctx->imap = imap = xcalloc( sizeof(*imap), 1 );
 931         imap->buf.sock.fd = -1;
 932         imap->in_progress_append = &imap->in_progress;
 933
 934         /* open connection to IMAP server */
 935
 936         if (srvc->tunnel) {
 937                 info( "Starting tunnel '%s'... ", srvc->tunnel );
 938
 939                 if (socketpair( PF_UNIX, SOCK_STREAM, 0, a )) {
 940                         perror( "socketpair" );
 941                         exit( 1 );
 942                 }
 943
 944                 if (fork() == 0) {
 945                         if (dup2( a[0], 0 ) == -1 || dup2( a[0], 1 ) == -1)
 946                                 _exit( 127 );
 947                         close( a[0] );
 948                         close( a[1] );
 949                         execl( "/bin/sh", "sh", "-c", srvc->tunnel, NULL );
 950                         _exit( 127 );
 951                 }
 952
 953                 close (a[0]);
 954
 955                 imap->buf.sock.fd = a[1];
 956
 957                 info( "ok\n" );
 958         } else {
 959                 memset( &addr, 0, sizeof(addr) );
 960                 addr.sin_port = htons( srvc->port );
 961                 addr.sin_family = AF_INET;
 962
 963                 info( "Resolving %s... ", srvc->host );
 964                 he = gethostbyname( srvc->host );
 965                 if (!he) {
 966                         perror( "gethostbyname" );
 967                         goto bail;
 968                 }
 969                 info( "ok\n" );
 970
 971                 addr.sin_addr.s_addr = *((int *) he->h_addr_list[0]);
 972
 973                 s = socket( PF_INET, SOCK_STREAM, 0 );
 974
 975                 info( "Connecting to %s:%hu... ", inet_ntoa( addr.sin_addr ), ntohs( addr.sin_port ) );
 976                 if (connect( s, (struct sockaddr *)&addr, sizeof(addr) )) {
 977                         close( s );
 978                         perror( "connect" );
 979                         goto bail;
 980                 }
 981                 info( "ok\n" );
 982
 983                 imap->buf.sock.fd = s;
 984
 985         }
 986
 987         /* read the greeting string */
 988         if (buffer_gets( &imap->buf, &rsp )) {
 989                 fprintf( stderr, "IMAP error: no greeting response\n" );
 990                 goto bail;
 991         }
 992         arg = next_arg( &rsp );
 993         if (!arg || *arg != '*' || (arg = next_arg( &rsp )) == NULL) {
 994                 fprintf( stderr, "IMAP error: invalid greeting response\n" );
 995                 goto bail;
 996         }
 997         preauth = 0;
 998         if (!strcmp( "PREAUTH", arg ))
 999                 preauth = 1;
1000         else if (strcmp( "OK", arg ) != 0) {
1001                 fprintf( stderr, "IMAP error: unknown greeting response\n" );
1002                 goto bail;
1003         }
1004         parse_response_code( ctx, 0, rsp );
1005         if (!imap->caps && imap_exec( ctx, 0, "CAPABILITY" ) != RESP_OK)
1006                 goto bail;
1007
1008         if (!preauth) {
1009
1010                 info ("Logging in...\n");
1011                 if (!srvc->user) {
1012                         fprintf( stderr, "Skipping server %s, no user\n", srvc->host );
1013                         goto bail;
1014                 }
1015                 if (!srvc->pass) {
1016                         char prompt[80];
1017                         sprintf( prompt, "Password (%s@%s): ", srvc->user, srvc->host );
1018                         arg = getpass( prompt );
1019                         if (!arg) {
1020                                 perror( "getpass" );
1021                                 exit( 1 );
1022                         }
1023                         if (!*arg) {
1024                                 fprintf( stderr, "Skipping account %s@%s, no password\n", srvc->user, srvc->host );
1025                                 goto bail;
1026                         }
1027                         /*
1028                          * getpass() returns a pointer to a static buffer.  make a copy
1029                          * for long term storage.
1030                          */
1031                         srvc->pass = strdup( arg );
1032                 }
1033                 if (CAP(NOLOGIN)) {
1034                         fprintf( stderr, "Skipping account %s@%s, server forbids LOGIN\n", srvc->user, srvc->host );
1035                         goto bail;
1036                 }
1037                 warn( "*** IMAP Warning *** Password is being sent in the clear\n" );
1038                 if (imap_exec( ctx, 0, "LOGIN \"%s\" \"%s\"", srvc->user, srvc->pass ) != RESP_OK) {
1039                         fprintf( stderr, "IMAP error: LOGIN failed\n" );
1040                         goto bail;
1041                 }
1042         } /* !preauth */
1043
1044         ctx->prefix = "";
1045         ctx->trashnc = 1;
1046         return (store_t *)ctx;
1047
1048   bail:
1049         imap_close_store( &ctx->gen );
1050         return 0;
1051 }
1052
1053 static int
1054 imap_make_flags( int flags, char *buf )
1055 {
1056         const char *s;
1057         unsigned i, d;
1058
1059         for (i = d = 0; i < ARRAY_SIZE(Flags); i++)
1060                 if (flags & (1 << i)) {
1061                         buf[d++] = ' ';
1062                         buf[d++] = '\\';
1063                         for (s = Flags[i]; *s; s++)
1064                                 buf[d++] = *s;
1065                 }
1066         buf[0] = '(';
1067         buf[d++] = ')';
1068         return d;
1069 }
1070
1071 #define TUIDL 8
1072
1073 static int
1074 imap_store_msg( store_t *gctx, msg_data_t *data, int *uid )
1075 {
1076         imap_store_t *ctx = (imap_store_t *)gctx;
1077         imap_t *imap = ctx->imap;
1078         struct imap_cmd_cb cb;
1079         char *fmap, *buf;
1080         const char *prefix, *box;
1081         int ret, i, j, d, len, extra, nocr;
1082         int start, sbreak = 0, ebreak = 0;
1083         char flagstr[128], tuid[TUIDL * 2 + 1];
1084
1085         memset( &cb, 0, sizeof(cb) );
1086
1087         fmap = data->data;
1088         len = data->len;
1089         nocr = !data->crlf;
1090         extra = 0, i = 0;
1091         if (!CAP(UIDPLUS) && uid) {
1092           nloop:
1093                 start = i;
1094                 while (i < len)
1095                         if (fmap[i++] == '\n') {
1096                                 extra += nocr;
1097                                 if (i - 2 + nocr == start) {
1098                                         sbreak = ebreak = i - 2 + nocr;
1099                                         goto mktid;
1100                                 }
1101                                 if (!memcmp( fmap + start, "X-TUID: ", 8 )) {
1102                                         extra -= (ebreak = i) - (sbreak = start) + nocr;
1103                                         goto mktid;
1104                                 }
1105                                 goto nloop;
1106                         }
1107                 /* invalid message */
1108                 free( fmap );
1109                 return DRV_MSG_BAD;
1110          mktid:
1111                 for (j = 0; j < TUIDL; j++)
1112                         sprintf( tuid + j * 2, "%02x", arc4_getbyte() );
1113                 extra += 8 + TUIDL * 2 + 2;
1114         }
1115         if (nocr)
1116                 for (; i < len; i++)
1117                         if (fmap[i] == '\n')
1118                                 extra++;
1119
1120         cb.dlen = len + extra;
1121         buf = cb.data = xmalloc( cb.dlen );
1122         i = 0;
1123         if (!CAP(UIDPLUS) && uid) {
1124                 if (nocr) {
1125                         for (; i < sbreak; i++)
1126                                 if (fmap[i] == '\n') {
1127                                         *buf++ = '\r';
1128                                         *buf++ = '\n';
1129                                 } else
1130                                         *buf++ = fmap[i];
1131                 } else {
1132                         memcpy( buf, fmap, sbreak );
1133                         buf += sbreak;
1134                 }
1135                 memcpy( buf, "X-TUID: ", 8 );
1136                 buf += 8;
1137                 memcpy( buf, tuid, TUIDL * 2 );
1138                 buf += TUIDL * 2;
1139                 *buf++ = '\r';
1140                 *buf++ = '\n';
1141                 i = ebreak;
1142         }
1143         if (nocr) {
1144                 for (; i < len; i++)
1145                         if (fmap[i] == '\n') {
1146                                 *buf++ = '\r';
1147                                 *buf++ = '\n';
1148                         } else
1149                                 *buf++ = fmap[i];
1150         } else
1151                 memcpy( buf, fmap + i, len - i );
1152
1153         free( fmap );
1154
1155         d = 0;
1156         if (data->flags) {
1157                 d = imap_make_flags( data->flags, flagstr );
1158                 flagstr[d++] = ' ';
1159         }
1160         flagstr[d] = 0;
1161
1162         if (!uid) {
1163                 box = gctx->conf->trash;
1164                 prefix = ctx->prefix;
1165                 cb.create = 1;
1166                 if (ctx->trashnc)
1167                         imap->caps = imap->rcaps & ~(1 << LITERALPLUS);
1168         } else {
1169                 box = gctx->name;
1170                 prefix = !strcmp( box, "INBOX" ) ? "" : ctx->prefix;
1171                 cb.create = 0;
1172         }
1173         cb.ctx = uid;
1174         ret = imap_exec_m( ctx, &cb, "APPEND \"%s%s\" %s", prefix, box, flagstr );
1175         imap->caps = imap->rcaps;
1176         if (ret != DRV_OK)
1177                 return ret;
1178         if (!uid)
1179                 ctx->trashnc = 0;
1180         else
1181                 gctx->count++;
1182
1183         return DRV_OK;
1184 }
1185
1186 #define CHUNKSIZE 0x1000
1187
1188 static int
1189 read_message( FILE *f, msg_data_t *msg )
1190 {
1191         int len, r;
1192
1193         memset( msg, 0, sizeof *msg );
1194         len = CHUNKSIZE;
1195         msg->data = xmalloc( len+1 );
1196         msg->data[0] = 0;
1197
1198         while(!feof( f )) {
1199                 if (msg->len >= len) {
1200                         void *p;
1201                         len += CHUNKSIZE;
1202                         p = xrealloc(msg->data, len+1);
1203                         if (!p)
1204                                 break;
1205                 }
1206                 r = fread( &msg->data[msg->len], 1, len - msg->len, f );
1207                 if (r <= 0)
1208                         break;
1209                 msg->len += r;
1210         }
1211         msg->data[msg->len] = 0;
1212         return msg->len;
1213 }
1214
1215 static int
1216 count_messages( msg_data_t *msg )
1217 {
1218         int count = 0;
1219         char *p = msg->data;
1220
1221         while (1) {
1222                 if (!strncmp( "From ", p, 5 )) {
1223                         count++;
1224                         p += 5;
1225                 }
1226                 p = strstr( p+5, "\nFrom ");
1227                 if (!p)
1228                         break;
1229                 p++;
1230         }
1231         return count;
1232 }
1233
1234 static int
1235 split_msg( msg_data_t *all_msgs, msg_data_t *msg, int *ofs )
1236 {
1237         char *p, *data;
1238
1239         memset( msg, 0, sizeof *msg );
1240         if (*ofs >= all_msgs->len)
1241                 return 0;
1242
1243         data = &all_msgs->data[ *ofs ];
1244         msg->len = all_msgs->len - *ofs;
1245
1246         if (msg->len < 5 || strncmp( data, "From ", 5 ))
1247                 return 0;
1248
1249         p = strstr( data, "\nFrom " );
1250         if (p)
1251                 msg->len = &p[1] - data;
1252
1253         msg->data = xmalloc( msg->len + 1 );
1254         if (!msg->data)
1255                 return 0;
1256
1257         memcpy( msg->data, data, msg->len );
1258         msg->data[ msg->len ] = 0;
1259
1260         *ofs += msg->len;
1261         return 1;
1262 }
1263
1264 static imap_server_conf_t server =
1265 {
1266         NULL,   /* name */
1267         NULL,   /* tunnel */
1268         NULL,   /* host */
1269         0,      /* port */
1270         NULL,   /* user */
1271         NULL,   /* pass */
1272 };
1273
1274 static char *imap_folder;
1275
1276 static int
1277 git_imap_config(const char *key, const char *val)
1278 {
1279         char imap_key[] = "imap.";
1280
1281         if (strncmp( key, imap_key, sizeof imap_key - 1 ))
1282                 return 0;
1283         key += sizeof imap_key - 1;
1284
1285         if (!strcmp( "folder", key )) {
1286                 imap_folder = strdup( val );
1287         } else if (!strcmp( "host", key )) {
1288                 {
1289                         if (!strncmp( "imap:", val, 5 ))
1290                                 val += 5;
1291                         if (!server.port)
1292                                 server.port = 143;
1293                 }
1294                 if (!strncmp( "//", val, 2 ))
1295                         val += 2;
1296                 server.host = strdup( val );
1297         }
1298         else if (!strcmp( "user", key ))
1299                 server.user = strdup( val );
1300         else if (!strcmp( "pass", key ))
1301                 server.pass = strdup( val );
1302         else if (!strcmp( "port", key ))
1303                 server.port = git_config_int( key, val );
1304         else if (!strcmp( "tunnel", key ))
1305                 server.tunnel = strdup( val );
1306         return 0;
1307 }
1308
1309 int
1310 main(int argc, char **argv)
1311 {
1312         msg_data_t all_msgs, msg;
1313         store_t *ctx = 0;
1314         int uid = 0;
1315         int ofs = 0;
1316         int r;
1317         int total, n = 0;
1318
1319         /* init the random number generator */
1320         arc4_init();
1321
1322         git_config( git_imap_config );
1323
1324         if (!imap_folder) {
1325                 fprintf( stderr, "no imap store specified\n" );
1326                 return 1;
1327         }
1328
1329         /* read the messages */
1330         if (!read_message( stdin, &all_msgs )) {
1331                 fprintf(stderr,"nothing to send\n");
1332                 return 1;
1333         }
1334
1335         /* write it to the imap server */
1336         ctx = imap_open_store( &server );
1337         if (!ctx) {
1338                 fprintf( stderr,"failed to open store\n");
1339                 return 1;
1340         }
1341
1342         total = count_messages( &all_msgs );
1343         fprintf( stderr, "sending %d message%s\n", total, (total!=1)?"s":"" );
1344         ctx->name = imap_folder;
1345         while (1) {
1346                 unsigned percent = n * 100 / total;
1347                 fprintf( stderr, "%4u%% (%d/%d) done\r", percent, n, total );
1348                 if (!split_msg( &all_msgs, &msg, &ofs ))
1349                         break;
1350                 r = imap_store_msg( ctx, &msg, &uid );
1351                 if (r != DRV_OK) break;
1352                 n++;
1353         }
1354         fprintf( stderr,"\n" );
1355
1356         imap_close_store( ctx );
1357
1358         return 0;
1359 }