diplodocus.org Git - nmh/blob - uip/inc.c

   1 /* inc.c -- incorporate messages from a maildrop into a folder
   2  *
   3  * This code is Copyright (c) 2002, by the authors of nmh.  See the
   4  * COPYRIGHT file in the root directory of the nmh distribution for
   5  * complete copyright information.
   6  */
   7
   8 #ifdef MAILGROUP
   9 /*
  10  * Thu Feb 12 21:00 CST 2015            Marcin Cieslak <saper@saper.info>
  11  *    Replaced setgid() calls with setegid() so that it works with dot
  12  *    locking on FreeBSD.  setegid() should be supported on modern POSIX
  13  *    systems.
  14  *
  15  * Revised: Sat Apr 14 17:08:17 PDT 1990 (marvit@hplabs)
  16  *    Added hpux hacks to set and reset gid to be "mail" as needed. The reset
  17  *    is necessary so inc'ed mail is the group of the inc'er, rather than
  18  *    "mail". We setgid to egid only when [un]locking the mail file. This
  19  *    is also a major security precaution which will not be explained here.
  20  *
  21  * Fri Feb  7 16:04:57 PST 1992         John Romine <bug-mh@ics.uci.edu>
  22  *   NB: I'm not 100% sure that this setgid stuff is secure even now.
  23  *
  24  * See the *GROUPPRIVS() macros later. I'm reasonably happy with the setgid
  25  * attribute. Running setuid root is probably not a terribly good idea, though.
  26  *       -- Peter Maydell <pmaydell@chiark.greenend.org.uk>, 04/1998
  27  *
  28  * Peter Maydell's patch slightly modified for nmh 0.28-pre2.
  29  * Ruud de Rooij <ruud@debian.org>  Wed, 22 Jul 1998 13:24:22 +0200
  30  */
  31 #endif
  32
  33 #include "h/mh.h"
  34 #include "sbr/fmt_new.h"
  35 #include "sbr/dtime.h"
  36 #include "scansbr.h"
  37 #include "sbr/m_name.h"
  38 #include "sbr/m_gmprot.h"
  39 #include "sbr/getarguments.h"
  40 #include "sbr/concat.h"
  41 #include "sbr/seq_setunseen.h"
  42 #include "sbr/seq_setcur.h"
  43 #include "sbr/seq_save.h"
  44 #include "sbr/smatch.h"
  45 #include "sbr/getfolder.h"
  46 #include "sbr/ext_hook.h"
  47 #include "sbr/folder_read.h"
  48 #include "sbr/folder_realloc.h"
  49 #include "sbr/folder_free.h"
  50 #include "sbr/context_save.h"
  51 #include "sbr/context_replace.h"
  52 #include "sbr/context_find.h"
  53 #include "sbr/ambigsw.h"
  54 #include "sbr/path.h"
  55 #include "sbr/print_version.h"
  56 #include "sbr/print_help.h"
  57 #include "sbr/error.h"
  58 #include "h/utils.h"
  59 #include <fcntl.h>
  60 #include "h/dropsbr.h"
  61 #include "popsbr.h"
  62 #include "h/fmt_scan.h"
  63 #include "h/signals.h"
  64 #include "h/tws.h"
  65 #include "h/mts.h"
  66 #include "h/done.h"
  67 #include "sbr/lock_file.h"
  68 #include "sbr/m_maildir.h"
  69 #include "sbr/m_mktemp.h"
  70
  71 #ifndef TLS_SUPPORT
  72 # define TLSminc(a) (a)
  73 #else
  74 # define TLSminc(a)  0
  75 #endif
  76
  77 #define INC_SWITCHES \
  78     X("audit audit-file", 0, AUDSW) \
  79     X("noaudit", 0, NAUDSW) \
  80     X("changecur", 0, CHGSW) \
  81     X("nochangecur", 0, NCHGSW) \
  82     X("file name", 0, FILESW) \
  83     X("form formatfile", 0, FORMSW) \
  84     X("format string", 5, FMTSW) \
  85     X("host hostname", 0, HOSTSW) \
  86     X("user username", 0, USERSW) \
  87     X("port name/number", 0, PORTSW) \
  88     X("silent", 0, SILSW) \
  89     X("nosilent", 0, NSILSW) \
  90     X("truncate", 0, TRNCSW) \
  91     X("notruncate", 0, NTRNCSW) \
  92     X("width columns", 0, WIDTHSW) \
  93     X("version", 0, VERSIONSW) \
  94     X("help", 0, HELPSW) \
  95     X("snoop", 0, SNOOPSW) \
  96     X("sasl", 0, SASLSW) \
  97     X("nosasl", 0, NOSASLSW) \
  98     X("saslmech", 0, SASLMECHSW) \
  99     X("initialtls", TLSminc(-10), INITTLSSW) \
 100     X("notls", TLSminc(-5), NOTLSSW) \
 101     X("certverify", TLSminc(-10), CERTVERSW) \
 102     X("nocertverify", TLSminc(-12), NOCERTVERSW) \
 103     X("authservice", 0, AUTHSERVICESW) \
 104     X("proxy command", 0, PROXYSW) \
 105
 106 #define X(sw, minchars, id) id,
 107 DEFINE_SWITCH_ENUM(INC);
 108 #undef X
 109
 110 #define X(sw, minchars, id) { sw, minchars, id },
 111 DEFINE_SWITCH_ARRAY(INC, switches);
 112 #undef X
 113
 114 /*
 115  * flags for the mail source
 116  */
 117 #define INC_FILE  0
 118 #define INC_POP   1
 119
 120 static struct Maildir_entry {
 121         char *filename;
 122         time_t mtime;
 123 } *Maildir = NULL;
 124 static int num_maildir_entries = 0;
 125 static bool snoop;
 126
 127 typedef struct {
 128     FILE *mailout;
 129     long written;
 130 } pop_closure;
 131
 132 extern char response[];
 133
 134 /* This is an attempt to simplify things by putting all the
 135  * privilege ops into macros.
 136  * *GROUPPRIVS() is related to handling the setgid MAIL property,
 137  * and only applies if MAILGROUP is defined.
 138  * Basically, SAVEGROUPPRIVS() is called right at the top of main()
 139  * to initialise things, and then DROPGROUPPRIVS() and GETGROUPPRIVS()
 140  * do the obvious thing.
 141  *
 142  * There's probably a better implementation if we're allowed to use
 143  * BSD-style setreuid() rather than using POSIX saved-ids.
 144  * Anyway, if you're euid root it's a bit pointless to drop the group
 145  * permissions...
 146  *
 147  * I'm pretty happy that the security is good provided we aren't setuid root.
 148  * The only things we trust with group=mail privilege are lkfopen()
 149  * and lkfclose().
 150  */
 151
 152 /*
 153  * For setting and returning to "mail" gid
 154  */
 155 #ifdef MAILGROUP
 156 static gid_t return_gid;
 157 #define TRYDROPGROUPPRIVS() DROPGROUPPRIVS()
 158 #define DROPGROUPPRIVS() \
 159     if (setegid(getgid()) != 0) { \
 160         adios ("setegid", "unable to restore group to %ld", (long) getgid()); \
 161     }
 162 #define GETGROUPPRIVS() \
 163     if (setegid(return_gid) != 0) { \
 164         adios ("setegid", "unable to set group to %ld", (long) return_gid); \
 165     }
 166 #define SAVEGROUPPRIVS() return_gid = getegid()
 167 #else
 168 /* define *GROUPPRIVS() as null; this avoids having lots of "#ifdef MAILGROUP"s */
 169 #define TRYDROPGROUPPRIVS()
 170 #define DROPGROUPPRIVS()
 171 #define GETGROUPPRIVS()
 172 #define SAVEGROUPPRIVS()
 173 #endif /* not MAILGROUP */
 174
 175 /* these variables have to be globals so that done() can correctly clean up the lockfile */
 176 static bool locked;
 177 static char *newmail;
 178 static FILE *in;
 179
 180 /*
 181  * prototypes
 182  */
 183 static int maildir_srt(const void *va, const void *vb) PURE;
 184 static void inc_done(int) NORETURN;
 185 static int pop_action(void *closure, char *);
 186
 187 static int
 188 maildir_srt(const void *va, const void *vb)
 189 {
 190     const struct Maildir_entry *a = va, *b = vb;
 191     if (a->mtime > b->mtime)
 192       return 1;
 193     if (a->mtime < b->mtime)
 194       return -1;
 195     return 0;
 196 }
 197
 198 int
 199 main (int argc, char **argv)
 200 {
 201     static int inc_type;
 202     bool chgflag;
 203     int trnflag = 1;
 204     bool noisy;
 205     int width = -1;
 206     int hghnum = 0, msgnum = 0;
 207     FILE *pf = NULL;
 208     bool sasl, tls, noverify;
 209     int incerr = 0; /* <0 if inc hits an error which means it should not truncate mailspool */
 210     char *cp, *maildir = NULL, *folder = NULL;
 211     char *format = NULL, *form = NULL;
 212     char *host = NULL, *port = NULL, *user = NULL, *proxy = NULL;
 213     char *audfile = NULL, *from = NULL, *saslmech = NULL, *auth_svc = NULL;
 214     char buf[BUFSIZ], **argp, *nfs, **arguments;
 215     struct msgs *mp = NULL;
 216     struct stat st, s1;
 217     FILE *aud = NULL;
 218     char b[PATH_MAX + 1];
 219     char *maildir_copy = NULL;  /* copy of mail directory because the static gets overwritten */
 220
 221     int nmsgs, nbytes;
 222     char *MAILHOST_env_variable;
 223     set_done(inc_done);
 224
 225 /* absolutely the first thing we do is save our privileges,
 226  * and drop them if we can.
 227  */
 228     SAVEGROUPPRIVS();
 229     TRYDROPGROUPPRIVS();
 230
 231     if (nmh_init(argv[0], true, true)) { return 1; }
 232
 233     mts_init ();
 234     arguments = getarguments (invo_name, argc, argv, 1);
 235     argp = arguments;
 236
 237     /*
 238      * Scheme is:
 239      *        use MAILHOST environment variable if present,
 240      *  else try Hesiod.
 241      *  If that fails, use the default (if any)
 242      *  provided by mts.conf in mts_init()
 243      */
 244     if ((MAILHOST_env_variable = getenv("MAILHOST")) != NULL)
 245         pophost = MAILHOST_env_variable;
 246     /*
 247      * If there is a valid "pophost" entry in mts.conf,
 248      * then use it as the default host.
 249      */
 250     if (pophost && *pophost)
 251         host = pophost;
 252
 253     sasl = tls = false;
 254     chgflag = noisy = noverify = true;
 255     while ((cp = *argp++)) {
 256         if (*cp == '-') {
 257             switch (smatch (++cp, switches)) {
 258             case AMBIGSW:
 259                 ambigsw (cp, switches);
 260                 done (1);
 261             case UNKWNSW:
 262                 die("-%s unknown", cp);
 263
 264             case HELPSW:
 265                 snprintf (buf, sizeof(buf), "%s [+folder] [switches]", invo_name);
 266                 print_help (buf, switches, 1);
 267                 done (0);
 268             case VERSIONSW:
 269                 print_version(invo_name);
 270                 done (0);
 271
 272             case AUDSW:
 273                 if (!(cp = *argp++) || *cp == '-')
 274                     die("missing argument to %s", argp[-2]);
 275                 audfile = mh_xstrdup(m_maildir(cp));
 276                 continue;
 277             case NAUDSW:
 278                 audfile = NULL;
 279                 continue;
 280
 281             case CHGSW:
 282                 chgflag = true;
 283                 continue;
 284             case NCHGSW:
 285                 chgflag = false;
 286                 continue;
 287
 288             /*
 289              * The flag `trnflag' has the value:
 290              *
 291              * 2 if -truncate is given
 292              * 1 by default (truncating is default)
 293              * 0 if -notruncate is given
 294              */
 295             case TRNCSW:
 296                 trnflag = 2;
 297                 continue;
 298             case NTRNCSW:
 299                 trnflag = 0;
 300                 continue;
 301
 302             case FILESW:
 303                 if (!(cp = *argp++) || *cp == '-')
 304                     die("missing argument to %s", argp[-2]);
 305                 from = path (cp, TFILE);
 306
 307                 /*
 308                  * If the truncate file is in default state,
 309                  * change to not truncate.
 310                  */
 311                 if (trnflag == 1)
 312                     trnflag = 0;
 313                 continue;
 314
 315             case SILSW:
 316                 noisy = false;
 317                 continue;
 318             case NSILSW:
 319                 noisy = true;
 320                 continue;
 321
 322             case FORMSW:
 323                 if (!(form = *argp++) || *form == '-')
 324                     die("missing argument to %s", argp[-2]);
 325                 format = NULL;
 326                 continue;
 327             case FMTSW:
 328                 if (!(format = *argp++) || *format == '-')
 329                     die("missing argument to %s", argp[-2]);
 330                 form = NULL;
 331                 continue;
 332
 333             case WIDTHSW:
 334                 if (!(cp = *argp++) || *cp == '-')
 335                     die("missing argument to %s", argp[-2]);
 336                 width = atoi (cp);
 337                 continue;
 338
 339             case HOSTSW:
 340                 if (!(host = *argp++) || *host == '-')
 341                     die("missing argument to %s", argp[-2]);
 342                 continue;
 343
 344             case PORTSW:
 345                 if (!(port = *argp++) || *port == '-')
 346                     die("missing argument to %s", argp[-2]);
 347                 continue;
 348
 349             case USERSW:
 350                 if (!(user = *argp++) || *user == '-')
 351                     die("missing argument to %s", argp[-2]);
 352                 continue;
 353
 354             case SNOOPSW:
 355                 snoop = true;
 356                 continue;
 357
 358             case SASLSW:
 359                 sasl = true;
 360                 continue;
 361             case NOSASLSW:
 362                 sasl = false;
 363                 continue;
 364
 365             case SASLMECHSW:
 366                 if (!(saslmech = *argp++) || *saslmech == '-')
 367                     die("missing argument to %s", argp[-2]);
 368                 continue;
 369
 370             case INITTLSSW:
 371                 tls = true;
 372                 continue;
 373
 374             case NOTLSSW:
 375                 tls = false;
 376                 continue;
 377
 378             case CERTVERSW:
 379                 noverify = false;
 380                 continue;
 381
 382             case NOCERTVERSW:
 383                 noverify = true;
 384                 continue;
 385
 386             case AUTHSERVICESW:
 387 #ifdef OAUTH_SUPPORT
 388                 if (!(auth_svc = *argp++) || *auth_svc == '-')
 389                     die("missing argument to %s", argp[-2]);
 390 #else
 391                 die("not built with OAuth support");
 392 #endif
 393                 continue;
 394
 395             case PROXYSW:
 396                 if (!(proxy = *argp++) || *proxy == '-')
 397                     die("missing argument to %s", argp[-2]);
 398                 continue;
 399             }
 400         }
 401         if (*cp == '+' || *cp == '@') {
 402             if (folder)
 403                 die("only one folder at a time!");
 404             folder = pluspath (cp);
 405         } else {
 406             die("usage: %s [+folder] [switches]", invo_name);
 407         }
 408     }
 409
 410     /* NOTE: above this point you should use TRYDROPGROUPPRIVS(),
 411      * not DROPGROUPPRIVS().
 412      */
 413     if (host && !*host)
 414         host = NULL;
 415
 416     /* guarantee dropping group privileges; we might not have done so earlier */
 417     DROPGROUPPRIVS();
 418
 419     /* Source of mail;  -from overrides any -host. */
 420     inc_type = host && !from ? INC_POP : INC_FILE;
 421
 422     if (inc_type == INC_POP) {
 423         /* Mail from a POP server. */
 424         int tlsflag = 0;
 425
 426         if (auth_svc == NULL) {
 427             if (saslmech  &&  ! strcasecmp(saslmech, "xoauth2")) {
 428                 die("must specify -authservice with -saslmech xoauth2");
 429             }
 430         } else {
 431             if (user == NULL) {
 432                 die("must specify -user with -saslmech xoauth2");
 433             }
 434         }
 435
 436         if (tls)
 437             tlsflag |= P_INITTLS;
 438
 439         if (noverify)
 440             tlsflag |= P_NOVERIFY;
 441
 442         /*
 443          * initialize POP connection
 444          */
 445         if (pop_init (host, port, user, proxy, snoop, sasl, saslmech,
 446                       tlsflag, auth_svc) == NOTOK)
 447             die("%s", response);
 448
 449         /* Check if there are any messages */
 450         if (pop_stat (&nmsgs, &nbytes) == NOTOK)
 451             die("%s", response);
 452
 453         if (nmsgs == 0) {
 454             pop_quit();
 455             die("no mail to incorporate");
 456         }
 457
 458     } else if (inc_type == INC_FILE) {
 459         /* Mail from a spool file, or Maildir. */
 460         if (from)
 461             newmail = from;
 462         else if ((newmail = getenv ("MAILDROP")) && *newmail)
 463             newmail = m_mailpath (newmail);
 464         else if ((newmail = context_find ("maildrop")) && *newmail)
 465             newmail = m_mailpath (newmail);
 466         else {
 467             newmail = concat (MAILDIR, "/", MAILFIL, NULL);
 468         }
 469         if (stat (newmail, &s1) == NOTOK || s1.st_size == 0)
 470             die("no mail to incorporate");
 471         if (s1.st_mode & S_IFDIR) {
 472             DIR *md;
 473             struct dirent *de;
 474             struct stat ms;
 475             int i;
 476             i = 0;
 477             cp = concat (newmail, "/new", NULL);
 478             if ((md = opendir(cp)) == NULL)
 479                 die("unable to open %s", cp);
 480             while ((de = readdir (md)) != NULL) {
 481                 if (de->d_name[0] == '.')
 482                     continue;
 483                 if (i >= num_maildir_entries) {
 484                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 485                         die("not enough memory for %d messages", 2*i+16);
 486                     num_maildir_entries = 2*i+16;
 487                 }
 488                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 489                 if (stat(Maildir[i].filename, &ms) != 0)
 490                    adios (Maildir[i].filename, "couldn't get delivery time");
 491                 Maildir[i].mtime = ms.st_mtime;
 492                 i++;
 493             }
 494             free (cp);
 495             closedir (md);
 496             cp = concat (newmail, "/cur", NULL);
 497             if ((md = opendir(cp)) == NULL)
 498                 die("unable to open %s", cp);
 499             while ((de = readdir (md)) != NULL) {
 500                 if (de->d_name[0] == '.')
 501                     continue;
 502                 if (i >= num_maildir_entries) {
 503                     if ((Maildir = realloc(Maildir, sizeof(*Maildir) * (2*i+16))) == NULL)
 504                         die("not enough memory for %d messages", 2*i+16);
 505                     num_maildir_entries = 2*i+16;
 506                 }
 507                 Maildir[i].filename = concat (cp, "/", de->d_name, NULL);
 508                 if (stat(Maildir[i].filename, &ms) != 0)
 509                    adios (Maildir[i].filename, "couldn't get delivery time");
 510                 Maildir[i].mtime = ms.st_mtime;
 511                 i++;
 512             }
 513             free (cp);
 514             closedir (md);
 515             if (i == 0)
 516                 die("no mail to incorporate");
 517             num_maildir_entries = i;
 518             qsort (Maildir, num_maildir_entries, sizeof(*Maildir), maildir_srt);
 519         }
 520
 521         cp = mh_xstrdup(newmail);
 522         newmail = cp;
 523     }
 524
 525     if (!context_find ("path"))
 526         free (path ("./", TFOLDER));
 527     if (!folder)
 528         folder = getfolder (0);
 529     maildir = m_maildir (folder);
 530     maildir_copy = mh_xstrdup(maildir);
 531
 532     if (!folder_exists(maildir)) {
 533         /* If the folder doesn't exist, and we're given the -silent flag,
 534          * just fail.
 535          */
 536         if (noisy)
 537             create_folder(maildir, 0, done);
 538         else
 539             done (1);
 540     }
 541
 542     if (chdir (maildir) == NOTOK)
 543         adios (maildir, "unable to change directory to");
 544
 545     /* read folder and create message structure */
 546     if (!(mp = folder_read (folder, 0)))
 547         die("unable to read folder %s", folder);
 548
 549     if (inc_type == INC_FILE && Maildir == NULL) {
 550         /* Mail from a spool file. */
 551
 552         if (access (newmail, W_OK) != NOTOK) {
 553             locked = true;
 554             if (trnflag) {
 555                 SIGNAL (SIGHUP, SIG_IGN);
 556                 SIGNAL (SIGINT, SIG_IGN);
 557                 SIGNAL (SIGQUIT, SIG_IGN);
 558                 SIGNAL (SIGTERM, SIG_IGN);
 559             }
 560
 561             GETGROUPPRIVS();       /* Reset gid to lock mail file */
 562             in = lkfopenspool (newmail, "r");
 563             DROPGROUPPRIVS();
 564             if (in == NULL)
 565                 die("unable to lock and fopen %s", newmail);
 566             fstat (fileno(in), &s1);
 567         } else {
 568             trnflag = 0;
 569             if ((in = fopen (newmail, "r")) == NULL)
 570                 adios (newmail, "unable to read");
 571         }
 572     }
 573
 574     /* This shouldn't be necessary but it can't hurt. */
 575     DROPGROUPPRIVS();
 576
 577     if (audfile) {
 578         int i;
 579         if ((i = stat (audfile, &st)) == NOTOK)
 580             inform("Creating Receive-Audit: %s", audfile);
 581         if ((aud = fopen (audfile, "a")) == NULL)
 582             adios (audfile, "unable to append to");
 583         if (i == NOTOK)
 584             chmod (audfile, m_gmprot ());
 585
 586         if (from)
 587             fprintf (aud, "<<inc>> %s -ms %s\n", dtimenow(0), from);
 588         else {
 589             if (host)
 590                 fprintf (aud, "<<inc>> %s -host %s -user %s\n", dtimenow(0),
 591                          host, user);
 592             else
 593                 fprintf (aud, "<<inc>> %s\n", dtimenow (0));
 594         }
 595     }
 596
 597     /* Get new format string */
 598     nfs = new_fs (form, format, FORMAT);
 599
 600     if (noisy) {
 601         printf ("Incorporating new mail into %s...\n\n", folder);
 602         fflush (stdout);
 603     }
 604
 605
 606     /*
 607      * Get the mail from a POP server
 608      */
 609     if (inc_type == INC_POP) {
 610         /* Mail from a POP server. */
 611         int i;
 612         pop_closure pc;
 613
 614         hghnum = msgnum = mp->hghmsg;
 615         for (i = 1; i <= nmsgs; i++) {
 616             charstring_t scanl = NULL;
 617
 618             msgnum++;
 619             cp = mh_xstrdup(m_name (msgnum));
 620             if ((pf = fopen (cp, "w+")) == NULL)
 621                 adios (cp, "unable to write");
 622             chmod (cp, m_gmprot ());
 623
 624             pc.written = 0;
 625             pc.mailout = pf;
 626             if (pop_retr(i, pop_action, &pc) == NOTOK)
 627                 die("%s", response);
 628
 629             if (fflush (pf))
 630                 adios (cp, "write error on");
 631             fseek (pf, 0L, SEEK_SET);
 632             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 633                               msgnum == mp->hghmsg + 1 && chgflag,
 634                               1, NULL, pc.written, noisy, &scanl)) {
 635             case SCNEOF:
 636                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 637                 break;
 638
 639             case SCNFAT:
 640                 trnflag = 0;
 641                 noisy = true;
 642                 /* advise (cp, "unable to read"); already advised */
 643                 break;
 644
 645             case SCNERR:
 646             case SCNNUM:
 647                 break;
 648
 649             case SCNMSG:
 650             case SCNENC:
 651             default:
 652                 if (aud)
 653                     fputs (charstring_buffer (scanl), aud);
 654                 if (noisy)
 655                     fflush (stdout);
 656                 break;
 657             }
 658             charstring_free (scanl);
 659
 660             if (ferror(pf) || fclose (pf)) {
 661                 int e = errno;
 662                 (void) m_unlink (cp);
 663                 pop_quit ();
 664                 errno = e;
 665                 adios (cp, "write error on");
 666             }
 667             free (cp);
 668
 669             if (trnflag && pop_dele (i) == NOTOK)
 670                 die("%s", response);
 671
 672             scan_finished();
 673         }
 674
 675         if (pop_quit () == NOTOK)
 676             die("%s", response);
 677
 678     } else if (inc_type == INC_FILE && Maildir == NULL) {
 679         /* Mail from a spool file. */
 680
 681         scan_detect_mbox_style (in);            /* the MAGIC invocation... */
 682         hghnum = msgnum = mp->hghmsg;
 683         for (;;) {
 684             charstring_t scanl = NULL;
 685
 686             /* create scanline for new message */
 687             switch (incerr = scan (in, msgnum + 1, msgnum + 1, nfs, width,
 688                               msgnum == hghnum && chgflag, 1, NULL, 0L, noisy,
 689                               &scanl)) {
 690             case SCNFAT:
 691             case SCNEOF:
 692                 break;
 693
 694             case SCNERR:
 695                 if (aud)
 696                     fputs ("inc aborted!\n", aud);
 697                 inform("aborted!");     /* doesn't clean up locks! */
 698                 break;
 699
 700             case SCNNUM:
 701                 inform("BUG in %s, number out of range", invo_name);
 702                 break;
 703
 704             default:
 705                 inform("BUG in %s, scan() botch (%d)", invo_name, incerr);
 706                 break;
 707
 708             case SCNMSG:
 709             case SCNENC:
 710                 /*
 711                  *  Run the external program hook on the message.
 712                  */
 713
 714                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 715                 (void)ext_hook("add-hook", b, NULL);
 716
 717                 if (aud)
 718                     fputs (charstring_buffer (scanl), aud);
 719                 if (noisy)
 720                     fflush (stdout);
 721
 722                 msgnum++;
 723                 continue;
 724             }
 725             charstring_free (scanl);
 726
 727             /* If we get here there was some sort of error from scan(),
 728              * so stop processing anything more from the spool.
 729              */
 730             break;
 731         }
 732
 733     } else {
 734         /* Mail from Maildir. */
 735         char *sp;
 736         FILE *sf;
 737         int i;
 738
 739         hghnum = msgnum = mp->hghmsg;
 740         for (i = 0; i < num_maildir_entries; i++) {
 741             charstring_t scanl = NULL;
 742
 743             msgnum++;
 744
 745             sp = Maildir[i].filename;
 746             cp = mh_xstrdup(m_name (msgnum));
 747             pf = NULL;
 748             if (!trnflag || link(sp, cp) == -1) {
 749                 static char buf[65536];
 750                 size_t nrd;
 751
 752                 if ((sf = fopen (sp, "r")) == NULL)
 753                     adios (sp, "unable to read for copy");
 754                 if ((pf = fopen (cp, "w+")) == NULL)
 755                     adios (cp, "unable to write for copy");
 756                 while ((nrd = fread(buf, 1, sizeof(buf), sf)) > 0)
 757                     if (fwrite(buf, 1, nrd, pf) != nrd)
 758                         break;
 759                 if (ferror(sf) || fflush(pf) || ferror(pf)) {
 760                         int e = errno;
 761                         fclose(pf); fclose(sf); (void) m_unlink(cp);
 762                         errno = e;
 763                         adios(cp, "copy error %s -> %s", sp, cp);
 764                 }
 765                 fclose (sf);
 766                 sf = NULL;
 767             }
 768             if (pf == NULL && (pf = fopen (cp, "r")) == NULL)
 769                 adios (cp, "not available");
 770             chmod (cp, m_gmprot ());
 771
 772             fseek (pf, 0L, SEEK_SET);
 773             switch (incerr = scan (pf, msgnum, 0, nfs, width,
 774                               msgnum == mp->hghmsg + 1 && chgflag,
 775                               1, NULL, 0, noisy, &scanl)) {
 776             case SCNEOF:
 777                 printf ("%*d  empty\n", DMAXFOLDER, msgnum);
 778                 break;
 779
 780             case SCNFAT:
 781                 trnflag = 0;
 782                 noisy = true;
 783                 /* advise (cp, "unable to read"); already advised */
 784                 break;
 785
 786             case SCNERR:
 787             case SCNNUM:
 788                 break;
 789
 790             case SCNMSG:
 791             case SCNENC:
 792             default:
 793                 /*
 794                  *  Run the external program hook on the message.
 795                  */
 796
 797                 (void)snprintf(b, sizeof (b), "%s/%d", maildir_copy, msgnum + 1);
 798                 (void)ext_hook("add-hook", b, NULL);
 799
 800                 if (aud)
 801                     fputs (charstring_buffer (scanl), aud);
 802                 if (noisy)
 803                     fflush (stdout);
 804                 break;
 805             }
 806             charstring_free (scanl);
 807
 808             if (ferror(pf) || fclose (pf)) {
 809                 int e = errno;
 810                 (void) m_unlink (cp);
 811                 errno = e;
 812                 adios (cp, "write error on");
 813             }
 814             pf = NULL;
 815             free (cp);
 816
 817             if (trnflag && m_unlink (sp) == NOTOK)
 818                 adios (sp, "couldn't unlink");
 819             free (sp); /* Free Maildir[i]->filename */
 820
 821             scan_finished();
 822         }
 823         free (Maildir); /* From now on Maildir is just a flag - don't dref! */
 824     }
 825
 826     scan_finished ();
 827
 828     if (incerr < 0) {           /* error */
 829         if (locked) {
 830             GETGROUPPRIVS();      /* Be sure we can unlock mail file */
 831             (void) lkfclosespool (in, newmail); in = NULL;
 832             DROPGROUPPRIVS();    /* And then return us to normal privileges */
 833         } else {
 834             fclose (in); in = NULL;
 835         }
 836         die("failed");
 837     }
 838
 839     if (aud)
 840         fclose (aud);
 841
 842     if (noisy)
 843         fflush (stdout);
 844
 845     if (inc_type == INC_FILE && Maildir == NULL) {
 846         /* Mail from a spool file;  truncate it. */
 847
 848         if (trnflag) {
 849             if (stat (newmail, &st) != NOTOK && s1.st_mtime != st.st_mtime)
 850                 inform("new messages have arrived!\007");
 851             else {
 852                 int newfd;
 853                 if ((newfd = creat (newmail, 0600)) != NOTOK)
 854                     close (newfd);
 855                 else
 856                     admonish (newmail, "error zero'ing");
 857             }
 858         } else {
 859             if (noisy)
 860                 printf ("%s not zero'd\n", newmail);
 861         }
 862     }
 863
 864     if (msgnum == hghnum) {
 865         inform("no messages incorporated, continuing...");
 866     } else {
 867         /*
 868          * Lock the sequence file now, and loop to set the right flags
 869          * in the folder structure
 870          */
 871
 872         struct msgs *mp2;
 873         int i;
 874
 875         context_replace (pfolder, folder);      /* update current folder */
 876
 877         if ((mp2 = folder_read(folder, 1)) == NULL) {
 878             inform("Unable to reread folder %s, continuing...", folder);
 879             goto skip;
 880         }
 881
 882         /*
 883          * Shouldn't happen, but just in case ...
 884          */
 885
 886         if (msgnum >= mp2->hghoff
 887                 && !(mp2 = folder_realloc (mp2, mp2->lowoff, msgnum + 1))) {
 888             inform("unable to reallocate folder storage");
 889             goto skip;
 890         }
 891
 892         if (chgflag)
 893             mp2->curmsg = hghnum + 1;
 894         mp2->hghmsg = msgnum;
 895
 896         if (mp2->lowmsg == 0)
 897             mp2->lowmsg = 1;
 898         if (chgflag)            /* sigh... */
 899             seq_setcur (mp2, mp2->curmsg);
 900
 901         for (i = hghnum + 1; i <= msgnum; i++) {
 902             clear_msg_flags (mp2, i);
 903             set_exists (mp2, i);
 904             set_unseen (mp2, i);
 905         }
 906         mp2->msgflags |= SEQMOD;
 907         seq_setunseen(mp2, 0);  /* Set the Unseen-Sequence */
 908         seq_save(mp2);          /* Save the sequence file */
 909         folder_free(mp2);
 910     }
 911
 912 skip:
 913     if (inc_type == INC_FILE && Maildir == NULL) {
 914         /* Mail from a spool file;  unlock it. */
 915
 916         if (locked) {
 917            GETGROUPPRIVS();        /* Be sure we can unlock mail file */
 918            (void) lkfclosespool (in, newmail); in = NULL;
 919            DROPGROUPPRIVS();       /* And then return us to normal privileges */
 920         } else {
 921             fclose (in); in = NULL;
 922         }
 923     }
 924
 925     context_save ();            /* save the context file   */
 926     done (0);
 927     return 1;
 928 }
 929
 930
 931 static void NORETURN
 932 inc_done (int status)
 933 {
 934     set_done(exit);
 935     if (locked)
 936     {
 937         GETGROUPPRIVS();
 938         lkfclosespool(in, newmail);
 939         DROPGROUPPRIVS();
 940     }
 941     exit (status);
 942 }
 943
 944 static int
 945 pop_action(void *closure, char *s)
 946 {
 947     pop_closure *pc;
 948     int n;
 949
 950     pc = closure;
 951     n = fprintf(pc->mailout, "%s\n", s);
 952     if (n < 0)
 953         return NOTOK;
 954     pc->written += n; /* Count linefeed too. */
 955
 956     return OK;
 957 }