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

   1 /* aliasbr.c -- new aliasing mechanism
   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/aliasbr.h"
  10 #include "h/addrsbr.h"
  11 #include "h/utils.h"
  12 #include <pwd.h>
  13
  14 static int akvis;
  15 static char *akerrst;
  16
  17 struct aka *akahead = NULL;
  18 struct aka *akatail = NULL;
  19
  20 /*
  21  * prototypes
  22  */
  23 static  char *akval (struct aka *, char *);
  24 static bool aleq (char *, char *) PURE;
  25 static char *scanp (char *) PURE;
  26 static char *getp (char *);
  27 static char *seekp (char *, char *, char **);
  28 static int addfile (struct aka *, char *);
  29 static char *getalias (char *);
  30 static void add_aka (struct aka *, char *);
  31 static struct aka *akalloc (char *);
  32
  33
  34 /* Do mh alias substitution on 's' and return the results. */
  35 char *
  36 akvalue (char *s)
  37 {
  38     char *v;
  39
  40     if (akahead == NULL)
  41         alias (AliasFile);
  42
  43     akvis = -1;
  44     v = akval (akahead, s);
  45     if (akvis == -1)
  46         akvis = 0;
  47     return v;
  48 }
  49
  50
  51 int
  52 akvisible (void)
  53 {
  54     return akvis;
  55 }
  56
  57
  58 char *
  59 akresult (struct aka *ak)
  60 {
  61     char *cp = NULL, *dp, *pp;
  62     struct adr *ad;
  63
  64     for (ad = ak->ak_addr; ad; ad = ad->ad_next) {
  65         pp = ad->ad_local ? akval (ak->ak_next, ad->ad_text)
  66             : getcpy (ad->ad_text);
  67
  68         if (cp) {
  69             dp = cp;
  70             cp = concat (cp, ",", pp, NULL);
  71             free (dp);
  72             free (pp);
  73         }
  74         else
  75             cp = pp;
  76     }
  77
  78     if (akvis == -1)
  79         akvis = ak->ak_visible;
  80     return cp;
  81 }
  82
  83
  84 static  char *
  85 akval (struct aka *ak, char *s)
  86 {
  87     if (!s)
  88         return s;                       /* XXX */
  89
  90     /* It'd be tempting to check for a trailing semicolon and remove
  91        it.  But that would break the EXMH alias parser on what would
  92        then be valid expressions:
  93        http://lists.gnu.org/archive/html/nmh-workers/2012-10/msg00039.html
  94      */
  95
  96     for (; ak; ak = ak->ak_next) {
  97         if (aleq (s, ak->ak_name)) {
  98             return akresult (ak);
  99         }
 100
 101         if (strchr (s, ':')) {
 102             /* The first address in a blind list will contain the
 103                alias name, so try to match, but just with just the
 104                address (not including the list name).  If there's a
 105                match, then replace the alias part with its
 106                expansion. */
 107
 108             char *name = getname (s);
 109             char *cp = NULL;
 110
 111             if (name) {
 112                 /* s is of the form "Blind list: address".  If address
 113                    is an alias, expand it. */
 114                 struct mailname *mp = getm (name, NULL, 0, NULL, 0);
 115
 116                 if (mp  &&  mp->m_ingrp) {
 117                     char *gname = mh_xstrdup(FENDNULL(mp->m_gname));
 118
 119                     /* FIXME: gname must be true;  add() never returns NULL.
 120                      * Is some other test required? */
 121                     if (gname  &&  aleq (name, ak->ak_name)) {
 122                         /* Will leak cp. */
 123                         cp = concat (gname, akresult (ak), NULL);
 124                         free (gname);
 125                     }
 126                 }
 127
 128                 mnfree (mp);
 129             }
 130
 131             /* Need to flush getname after use. */
 132             while (getname ("")) continue;
 133
 134             if (cp) {
 135                 return cp;
 136             }
 137         }
 138     }
 139
 140     return mh_xstrdup(s);
 141 }
 142
 143
 144 static bool
 145 aleq (char *string, char *aliasent)
 146 {
 147     char c;
 148
 149     while ((c = *string++)) {
 150         if (*aliasent == '*')
 151             return true;
 152         if (tolower((unsigned char)c) != tolower((unsigned char)*aliasent))
 153             return false;
 154         aliasent++;
 155     }
 156
 157     return *aliasent == 0 || *aliasent == '*';
 158 }
 159
 160
 161 int
 162 alias (char *file)
 163 {
 164     int i;
 165     char *bp, *cp, *pp;
 166     char lc, *ap;
 167     struct aka *ak = NULL;
 168     FILE *fp;
 169
 170     if (*file != '/'
 171             && !has_prefix(file, "./") && !has_prefix(file, "../"))
 172         file = etcpath (file);
 173     if ((fp = fopen (file, "r")) == NULL) {
 174         akerrst = file;
 175         return AK_NOFILE;
 176     }
 177
 178     while (vfgets (fp, &ap) == OK) {
 179         bp = ap;
 180         switch (*(pp = scanp (bp))) {
 181             case '<':           /* recurse a level */
 182                 if (!*(cp = getp (pp + 1))) {
 183                     akerrst = "'<' without alias-file";
 184                     fclose (fp);
 185                     return AK_ERROR;
 186                 }
 187                 if ((i = alias (cp)) != AK_OK) {
 188                     fclose (fp);
 189                     return i;
 190                 }
 191                 continue;
 192             case ':':           /* comment */
 193             case ';':
 194             case '#':
 195             case 0:
 196                 continue;
 197         }
 198
 199         akerrst = bp;
 200         if (!*(cp = seekp (pp, &lc, &ap))) {
 201             fclose (fp);
 202             return AK_ERROR;
 203         }
 204         if (!(ak = akalloc (cp))) {
 205             fclose (fp);
 206             return AK_LIMIT;
 207         }
 208         switch (lc) {
 209             case ':':
 210                 ak->ak_visible = false;
 211                 break;
 212
 213             case ';':
 214                 ak->ak_visible = true;
 215                 break;
 216
 217             default:
 218                 fclose (fp);
 219                 return AK_ERROR;
 220         }
 221
 222         switch (*(pp = scanp (ap))) {
 223             case 0:             /* EOL */
 224                 fclose (fp);
 225                 return AK_ERROR;
 226
 227             case '<':           /* read values from file */
 228                 if (!*(cp = getp (pp + 1))) {
 229                     fclose (fp);
 230                     return AK_ERROR;
 231                 }
 232                 if (!addfile (ak, cp)) {
 233                     fclose (fp);
 234                     return AK_NOFILE;
 235                 }
 236                 break;
 237
 238             default:            /* list */
 239                 while ((cp = getalias (pp)))
 240                     add_aka (ak, cp);
 241                 break;
 242         }
 243     }
 244
 245     fclose (fp);
 246     return AK_OK;
 247 }
 248
 249
 250 char *
 251 akerror (int i)
 252 {
 253     static char buffer[BUFSIZ];
 254
 255     switch (i) {
 256         case AK_NOFILE:
 257             snprintf (buffer, sizeof(buffer), "unable to read '%s'", akerrst);
 258             break;
 259
 260         case AK_ERROR:
 261             snprintf (buffer, sizeof(buffer), "error in line '%s'", akerrst);
 262             break;
 263
 264         case AK_LIMIT:
 265             snprintf (buffer, sizeof(buffer), "out of memory while on '%s'", akerrst);
 266             break;
 267
 268         default:
 269             snprintf (buffer, sizeof(buffer), "unknown error (%d)", i);
 270             break;
 271     }
 272
 273     return buffer;
 274 }
 275
 276
 277 static char *
 278 scanp (char *p)
 279 {
 280     while (isspace ((unsigned char) *p))
 281         p++;
 282     return p;
 283 }
 284
 285
 286 static char *
 287 getp (char *p)
 288 {
 289     char  *cp = scanp (p);
 290
 291     p = cp;
 292     while (!isspace ((unsigned char) *cp) && *cp)
 293         cp++;
 294     *cp = 0;
 295
 296     return p;
 297 }
 298
 299
 300 static char *
 301 seekp (char *p, char *c, char **a)
 302 {
 303     char *cp;
 304
 305     p = cp = scanp (p);
 306     while (!isspace ((unsigned char) *cp) && *cp && *cp != ':' && *cp != ';')
 307         cp++;
 308     *c = *cp;
 309     *cp++ = 0;
 310     *a = cp;
 311
 312     return p;
 313 }
 314
 315
 316 static int
 317 addfile (struct aka *ak, char *file)
 318 {
 319     char *cp;
 320     char buffer[BUFSIZ];
 321     FILE *fp;
 322
 323     if (!(fp = fopen (etcpath (file), "r"))) {
 324         akerrst = file;
 325         return 0;
 326     }
 327
 328     while (fgets (buffer, sizeof buffer, fp))
 329         while ((cp = getalias (buffer)))
 330             add_aka (ak, cp);
 331
 332     fclose (fp);
 333     return 1;
 334 }
 335
 336
 337 static char *
 338 getalias (char *addrs)
 339 {
 340     char *pp, *qp;
 341     static char *cp = NULL;
 342
 343     if (cp == NULL)
 344         cp = addrs;
 345     else if (*cp == 0)
 346         return cp = NULL;
 347
 348     /* Remove leading any space from the address. */
 349     for (pp = cp; isspace ((unsigned char) *pp); pp++)
 350         continue;
 351     if (*pp == 0)
 352         return cp = NULL;
 353     /* Find the end of the address. */
 354     for (qp = pp; *qp != 0 && *qp != ','; qp++)
 355         continue;
 356     /* Set cp to point to the remainder of the addresses. */
 357     if (*qp == ',')
 358         *qp++ = 0;
 359     for (cp = qp, qp--; qp > pp; qp--)
 360         if (*qp != 0) {
 361             if (isspace ((unsigned char) *qp))
 362                 *qp = 0;
 363             else
 364                 break;
 365         }
 366
 367     return pp;
 368 }
 369
 370
 371 static void
 372 add_aka (struct aka *ak, char *pp)
 373 {
 374     struct adr *ad, *ld;
 375
 376     for (ad = ak->ak_addr, ld = NULL; ad; ld = ad, ad = ad->ad_next)
 377         if (!strcmp (pp, ad->ad_text))
 378             return;
 379
 380     NEW(ad);
 381     ad->ad_text = mh_xstrdup(pp);
 382     ad->ad_local = strchr(pp, '@') == NULL && strchr(pp, '!') == NULL;
 383     ad->ad_next = NULL;
 384     if (ak->ak_addr)
 385         ld->ad_next = ad;
 386     else
 387         ak->ak_addr = ad;
 388 }
 389
 390
 391 static struct aka *
 392 akalloc (char *id)
 393 {
 394     struct aka *p;
 395
 396     NEW(p);
 397     p->ak_name = getcpy (id);
 398     p->ak_visible = false;
 399     p->ak_addr = NULL;
 400     p->ak_next = NULL;
 401     if (akatail != NULL)
 402         akatail->ak_next = p;
 403     if (akahead == NULL)
 404         akahead = p;
 405     akatail = p;
 406
 407     return p;
 408 }