diplodocus.org Git - nmh/blob - sbr/addrsbr.c

   1 /* addrsbr.c -- parse addresses 822-style
   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 #include <h/mh.h>
   9 #include <h/addrsbr.h>
  10 #include <h/mf.h>
  11 #include <h/mts.h>
  12 #include <h/utils.h>
  13
  14 /* High level parsing of addresses:
  15
  16    The routines in sbr/mf.c parse the syntactic representations of
  17    addresses.  The routines in sbr/addrsbr.c associate semantics with those
  18    addresses.
  19
  20    The comments below are left in for historical purposes; DUMB and
  21    REALLYDUMB are now the default in the code.
  22
  23    If #ifdef DUMB is in effect, a full 822-style parser is called
  24    for syntax recognition.  This breaks each address into its components.
  25    Note however that no semantics are assumed about the parts or their
  26    totality.  This means that implicit hostnames aren't made explicit,
  27    and explicit hostnames aren't expanded to their "official" representations.
  28
  29    If DUMB is not in effect, then this module does some
  30    high-level thinking about what the addresses are.
  31
  32    1. for MMDF systems:
  33
  34         string%<uucp>@<local>   ->      string
  35
  36    2. for non-MMDF systems:
  37
  38         string@host.<uucp>      ->      host!string
  39
  40    3. for any system, an address interpreted relative to the local host:
  41
  42         string@<uucp>           ->      string
  43
  44    For cases (1) and (3) above, the leftmost host is extracted.  If it's not
  45    present, the local host is used.  If the tests above fail, the address is
  46    considered to be a real 822-style address.
  47
  48    If an explicit host is not present, then MH checks for a bang to indicate
  49    an explicit UUCP-style address.  If so, this is noted.  If not, the host is
  50    defaulted, typically to the local host.  The lack of an explicit host is
  51    also noted.
  52
  53    If an explicit 822-style host is present, then MH checks to see if it
  54    can expand this to the official name for the host.  If the hostname is
  55    unknown, the address is so typed.
  56
  57    To summarize, when we're all done, here's what MH knows about the address:
  58
  59    DUMB -       type:   local, uucp, or network
  60                 host:   not locally defaulted, not explicitly expanded
  61                 everything else
  62
  63    other -      type:   local, uucp, network, unknown
  64                 everything else
  65  */
  66
  67
  68 static int  ingrp = 0;
  69 static char *pers = NULL;
  70 static char *mbox = NULL;
  71 static char *host = NULL;
  72 static char *route = NULL;
  73 static char *grp = NULL;
  74 static char *note = NULL;
  75 static char err[BUFSIZ];
  76 static char adr[BUFSIZ];
  77 static int eai = 0;
  78
  79 void
  80 enable_eai(void) {
  81     eai = 1;
  82 }
  83
  84
  85 char *
  86 getname (const char *addrs)
  87 {
  88     struct adrx *ap;
  89     pers = mbox = host = route = grp = note = NULL;
  90     err[0] = '\0';
  91
  92     if ((ap = getadrx (FENDNULL(addrs), eai)) == NULL) {
  93         return NULL;
  94     }
  95
  96     strncpy (adr, ap->text, sizeof(adr));
  97     pers = ap->pers;
  98     mbox = ap->mbox;
  99     host = ap->host;
 100     route = ap->path;
 101     grp = ap->grp;
 102     ingrp = ap->ingrp;
 103     note = ap->note;
 104     if (ap->err && *ap->err)
 105         strncpy (err, ap->err, sizeof(err));
 106
 107     return adr;
 108 }
 109
 110
 111 struct mailname *
 112 getm (char *str, char *dfhost, int dftype, char *eresult, size_t eresultsize)
 113 {
 114     char *pp;
 115     struct mailname *mp;
 116
 117     if (err[0]) {
 118         if (eresult) {
 119             strncpy (eresult, err, eresultsize);
 120             eresult[eresultsize - 1] = '\0';
 121         }
 122         return NULL;
 123     }
 124     if (pers == NULL
 125             && mbox == NULL && host == NULL && route == NULL
 126             && grp == NULL) {
 127         if (eresult) {
 128             strncpy (eresult, "null address", eresultsize);
 129             eresult[eresultsize - 1] = '\0';
 130         }
 131         return NULL;
 132     }
 133     if (mbox == NULL && grp == NULL) {
 134         if (eresult) {
 135             strncpy (eresult, "no mailbox in address", eresultsize);
 136             eresult[eresultsize - 1] = '\0';
 137         }
 138         return NULL;
 139     }
 140
 141     if (dfhost == NULL) {
 142         dfhost = LocalName (0);
 143         dftype = LOCALHOST;
 144     }
 145
 146     NEW0(mp);
 147     mp->m_next = NULL;
 148     mp->m_text = getcpy (str);
 149     if (pers)
 150         mp->m_pers = mh_xstrdup(pers);
 151
 152     if (mbox == NULL) {
 153         mp->m_type = BADHOST;
 154         mp->m_nohost = 1;
 155         mp->m_ingrp = ingrp;
 156         mp->m_gname = getcpy (grp);
 157         if (note)
 158             mp->m_note = mh_xstrdup(note);
 159         return mp;
 160     }
 161
 162     if (host) {
 163         mp->m_mbox = getcpy (mbox);
 164         mp->m_host = mh_xstrdup(host);
 165         mp->m_type =
 166             strcasecmp (LocalName(0), mp->m_host) ? NETHOST : LOCALHOST;
 167     } else {
 168         if ((pp = strchr(mbox, '!'))) {
 169             *pp++ = '\0';
 170             mp->m_mbox = mh_xstrdup(pp);
 171             mp->m_host = getcpy (mbox);
 172             mp->m_type = UUCPHOST;
 173         } else {
 174             mp->m_nohost = 1;
 175             mp->m_mbox = getcpy (mbox);
 176             if (route == NULL && dftype == LOCALHOST) {
 177                 mp->m_host = NULL;
 178                 mp->m_type = dftype;
 179             } else {
 180                 mp->m_host = route ? NULL : getcpy (dfhost);
 181                 mp->m_type = route ? NETHOST : dftype;
 182             }
 183         }
 184     }
 185
 186     /* For alternate mailboxes, m_type gets overwritten in ismymbox ()
 187        to support wild-card matching. */
 188
 189     if (route)
 190         mp->m_path = mh_xstrdup(route);
 191     mp->m_ingrp = ingrp;
 192     if (grp)
 193         mp->m_gname = mh_xstrdup(grp);
 194     if (note)
 195         mp->m_note = mh_xstrdup(note);
 196
 197     return mp;
 198 }
 199
 200
 201 void
 202 mnfree (struct mailname *mp)
 203 {
 204     if (!mp)
 205         return;
 206
 207     free(mp->m_text);
 208     free(mp->m_pers);
 209     free(mp->m_mbox);
 210     free(mp->m_host);
 211     free(mp->m_path);
 212     free(mp->m_gname);
 213     free(mp->m_note);
 214
 215     free(mp);
 216 }
 217
 218
 219 char *
 220 auxformat (struct mailname *mp, int extras)
 221 {
 222     static char addr[BUFSIZ];
 223     static char buffer[BUFSIZ];
 224
 225         if (mp->m_nohost)
 226             strncpy (addr, FENDNULL(mp->m_mbox), sizeof(addr));
 227         else if (mp->m_type != UUCPHOST) {
 228             if (mp->m_host)
 229                 snprintf (addr, sizeof(addr), "%s%s@%s", FENDNULL(mp->m_path),
 230                           FENDNULL(mp->m_mbox), mp->m_host);
 231             else snprintf (addr, sizeof(addr), "%s%s", FENDNULL(mp->m_path),
 232                            FENDNULL(mp->m_mbox));
 233         } else
 234             snprintf (addr, sizeof(addr), "%s!%s", mp->m_host, mp->m_mbox);
 235
 236     if (!extras)
 237         return addr;
 238
 239     if (mp->m_pers || mp->m_path) {
 240         if (mp->m_note)
 241             snprintf (buffer, sizeof(buffer), "%s %s <%s>",
 242                     legal_person (mp->m_pers ? mp->m_pers : mp->m_mbox),
 243                     mp->m_note, addr);
 244         else
 245             snprintf (buffer, sizeof(buffer), "%s <%s>",
 246                     legal_person (mp->m_pers ? mp->m_pers : mp->m_mbox),
 247                     addr);
 248     } else if (mp->m_note)
 249         snprintf (buffer, sizeof(buffer), "%s %s", addr, mp->m_note);
 250     else
 251         strncpy (buffer, addr, sizeof(buffer));
 252
 253     return buffer;
 254 }
 255
 256
 257 #define W_NIL   0x0000
 258 #define W_MBEG  0x0001
 259 #define W_MEND  0x0002
 260 #define W_MBOX  (W_MBEG | W_MEND)
 261 #define W_HBEG  0x0004
 262 #define W_HEND  0x0008
 263 #define W_HOST  (W_HBEG | W_HEND)
 264 #define WBITS   "\020\01MBEG\02MEND\03HBEG\04HEND"
 265
 266 /*
 267  * Check if this is my address
 268  */
 269
 270 bool
 271 ismymbox (struct mailname *np)
 272 {
 273     int oops;
 274     int len, i;
 275     char *cp;
 276     char *pp;
 277     char buffer[BUFSIZ];
 278     struct mailname *mp;
 279     static char *am = NULL;
 280     static struct mailname mq;
 281     static int localmailbox = 0;
 282
 283     /*
 284      * If this is the first call, initialize
 285      * list of alternate mailboxes.
 286      */
 287     if (am == NULL) {
 288         mq.m_next = NULL;
 289         mq.m_mbox = getusername ();
 290
 291         if ((am = context_find ("local-mailbox"))) {
 292
 293             localmailbox++;
 294
 295             if ((cp = getname(am)) == NULL) {
 296                 inform("Unable to find address in local-mailbox, continuing...");
 297                 return false;
 298             }
 299
 300             if ((mq.m_next = getm (cp, NULL, 0, NULL, 0)) == NULL) {
 301                 inform("invalid entry in local-mailbox: %s, continuing...", cp);
 302                 return false;
 303             }
 304
 305             /* Sigh, it turns out that the address parser gets messed up
 306              * if you don't call getname() until it returns NULL. */
 307             while (getname(am) != NULL)
 308                 ;
 309         }
 310
 311         if ((am = context_find ("alternate-mailboxes")) == NULL)
 312             am = getusername();
 313         else {
 314             mp = mq.m_next ? mq.m_next : &mq;
 315             oops = 0;
 316             while ((cp = getname (am))) {
 317                 if ((mp->m_next = getm (cp, NULL, 0, NULL, 0)) == NULL) {
 318                     inform("illegal address: %s, continuing...", cp);
 319                     oops++;
 320                 } else {
 321                     mp = mp->m_next;
 322                     mp->m_type = W_NIL;
 323                     if (*mp->m_mbox == '*') {
 324                         mp->m_type |= W_MBEG;
 325                         mp->m_mbox++;
 326                     }
 327                     if (*(cp = mp->m_mbox + strlen (mp->m_mbox) - 1) == '*') {
 328                         mp->m_type |= W_MEND;
 329                         *cp = '\0';
 330                     }
 331                     if (mp->m_host) {
 332                         if (*mp->m_host == '*') {
 333                             mp->m_type |= W_HBEG;
 334                             mp->m_host++;
 335                         }
 336                         if (*(cp = mp->m_host + strlen (mp->m_host) - 1) == '*') {
 337                             mp->m_type |= W_HEND;
 338                             *cp = '\0';
 339                         }
 340                     }
 341                 }
 342             }
 343             if (oops)
 344                 inform("please fix the %s: entry in your %s file",
 345                         "alternate-mailboxes", mh_profile);
 346         }
 347
 348         if ((cp = getenv ("MHWDEBUG")) && *cp) {
 349             for (mp = &mq; mp; mp = mp->m_next) {
 350               fprintf (stderr, "Local- or Alternate-Mailbox: text=\"%s\" "
 351                        "mbox=\"%s\" host=\"%s\" %s\n",
 352                        FENDNULL(mp->m_text), mp->m_mbox,
 353                        FENDNULL(mp->m_host),
 354                        snprintb (buffer, sizeof(buffer), (unsigned) mp->m_type,
 355                                  WBITS));
 356             }
 357         }
 358     }
 359
 360     if (np == NULL) /* XXX */
 361         return false;
 362
 363     /*
 364      * Don't perform this "local" test if we have a Local-Mailbox set
 365      */
 366
 367     if (! localmailbox)
 368         switch (np->m_type) {
 369             case NETHOST:
 370                 len = strlen (cp = LocalName (0));
 371                 if (!uprf (np->m_host, cp) || np->m_host[len] != '.')
 372                     break;
 373                 goto local_test;
 374
 375             case UUCPHOST:
 376                 if (strcasecmp (np->m_host, SystemName()))
 377                     break;
 378                     /* FALLTHRU */
 379             case LOCALHOST:
 380 local_test: ;
 381                 if (!strcasecmp (np->m_mbox, mq.m_mbox))
 382                     return true;
 383                 break;
 384
 385             default:
 386                 break;
 387         }
 388
 389     /*
 390      * Now scan through list of alternate
 391      * mailboxes, and check for a match.
 392      */
 393     for (mp = &mq; mp->m_next;) {
 394         mp = mp->m_next;
 395         if (!np->m_mbox)
 396             continue;
 397         if ((len = strlen (cp = np->m_mbox))
 398                 < (i = strlen (pp = mp->m_mbox)))
 399             continue;
 400         switch (mp->m_type & W_MBOX) {
 401             case W_NIL:
 402                 if (strcasecmp (cp, pp))
 403                     continue;
 404                 break;
 405             case W_MBEG:
 406                 if (strcasecmp (cp + len - i, pp))
 407                     continue;
 408                 break;
 409             case W_MEND:
 410                 if (!uprf (cp, pp))
 411                     continue;
 412                 break;
 413             case W_MBEG | W_MEND:
 414                 if (stringdex (pp, cp) < 0)
 415                     continue;
 416                 break;
 417         }
 418
 419         if (mp->m_nohost)
 420             return true;
 421         if (np->m_host == NULL || mp->m_host == NULL)
 422             continue;
 423         if ((len = strlen (cp = np->m_host))
 424                 < (i = strlen (pp = mp->m_host)))
 425             continue;
 426         switch (mp->m_type & W_HOST) {
 427             case W_NIL:
 428                 if (strcasecmp (cp, pp))
 429                     continue;
 430                 break;
 431             case W_HBEG:
 432                 if (strcasecmp (cp + len - i, pp))
 433                     continue;
 434                 break;
 435             case W_HEND:
 436                 if (!uprf (cp, pp))
 437                     continue;
 438                 break;
 439             case W_HBEG | W_HEND:
 440                 if (stringdex (pp, cp) < 0)
 441                     continue;
 442                 break;
 443         }
 444         return true;
 445     }
 446
 447     return false;
 448 }