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