+\f/*
+** UDBSENDER -- return canonical external name of sender, given local name
+**
+** Parameters:
+** sender -- the name of the sender on the local machine.
+**
+** Returns:
+** The external name for this sender, if derivable from the
+** database.
+** NULL -- if nothing is changed from the database.
+**
+** Side Effects:
+** none.
+*/
+
+char *
+udbsender(sender)
+ char *sender;
+{
+ extern char *udbmatch();
+
+ return udbmatch(sender, "mailname");
+}
+
+
+char *
+udbmatch(user, field)
+ char *user;
+ char *field;
+{
+ register char *p;
+ register struct udbent *up;
+ int i;
+ int keylen;
+ DBT key, info;
+ char keybuf[MAXKEY];
+
+ if (tTd(28, 1))
+ printf("udbmatch(%s, %s)\n", user, field);
+
+ if (!UdbInitialized)
+ {
+ if (_udbx_init() == EX_TEMPFAIL)
+ return NULL;
+ }
+
+ /* short circuit if no spec */
+ if (UdbSpec == NULL || UdbSpec[0] == '\0')
+ return NULL;
+
+ /* short circuit name begins with '\\' since it can't possibly match */
+ if (user[0] == '\\')
+ return NULL;
+
+ /* long names can never match and are a pain to deal with */
+ if ((strlen(user) + strlen(field)) > sizeof keybuf - 4)
+ return NULL;
+
+ /* names beginning with colons indicate metadata */
+ if (user[0] == ':')
+ return NULL;
+
+ /* build database key */
+ (void) strcpy(keybuf, user);
+ (void) strcat(keybuf, ":");
+ (void) strcat(keybuf, field);
+ keylen = strlen(keybuf);
+
+ for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
+ {
+ /*
+ ** Select action based on entry type.
+ */
+
+ switch (up->udb_type)
+ {
+ case UDB_DBFETCH:
+ key.data = keybuf;
+ key.size = keylen;
+ i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
+ if (i != 0 || info.size <= 0)
+ {
+ if (tTd(28, 2))
+ printf("udbmatch: no match on %s (%d) via db\n",
+ keybuf, keylen);
+ continue;
+ }
+
+ p = xalloc(info.size + 1);
+ bcopy(info.data, p, info.size);
+ p[info.size] = '\0';
+ if (tTd(28, 1))
+ printf("udbmatch ==> %s\n", p);
+ return p;
+ break;
+
+#ifdef HESIOD
+ case UDB_HESIOD:
+ key.data = keybuf;
+ key.size = keylen;
+ i = hes_udb_get(&key, &info);
+ if (i != 0 || info.size <= 0)
+ {
+ if (tTd(28, 2))
+ printf("udbmatch: no match on %s (%d) via hesiod\n",
+ keybuf, keylen);
+ continue;
+ }
+
+ p = xalloc(info.size + 1);
+ bcopy(info.data, p, info.size);
+ p[info.size] = '\0';
+ free(info.data);
+ if (tTd(28, 1))
+ printf("udbmatch ==> %s\n", p);
+ return p;
+ break;
+#endif /* HESIOD */
+ }
+ }
+
+ if (strcmp(field, "mailname") != 0)
+ return NULL;
+
+ /*
+ ** Nothing yet. Search again for a default case. But only
+ ** use it if we also have a forward (:maildrop) pointer already
+ ** in the database.
+ */
+
+ /* build database key */
+ (void) strcpy(keybuf, user);
+ (void) strcat(keybuf, ":maildrop");
+ keylen = strlen(keybuf);
+
+ for (up = UdbEnts; up->udb_type != UDB_EOLIST; up++)
+ {
+ switch (up->udb_type)
+ {
+ case UDB_DBFETCH:
+ /* get the default case for this database */
+ if (up->udb_default == NULL)
+ {
+ key.data = ":default:mailname";
+ key.size = strlen(key.data);
+ i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
+ if (i != 0 || info.size <= 0)
+ {
+ /* no default case */
+ up->udb_default = "";
+ continue;
+ }
+
+ /* save the default case */
+ up->udb_default = xalloc(info.size + 1);
+ bcopy(info.data, up->udb_default, info.size);
+ up->udb_default[info.size] = '\0';
+ }
+ else if (up->udb_default[0] == '\0')
+ continue;
+
+ /* we have a default case -- verify user:maildrop */
+ key.data = keybuf;
+ key.size = keylen;
+ i = (*up->udb_dbp->get)(up->udb_dbp, &key, &info, 0);
+ if (i != 0 || info.size <= 0)
+ {
+ /* nope -- no aliasing for this user */
+ continue;
+ }
+
+ /* they exist -- build the actual address */
+ p = xalloc(strlen(user) + strlen(up->udb_default) + 2);
+ (void) strcpy(p, user);
+ (void) strcat(p, "@");
+ (void) strcat(p, up->udb_default);
+ if (tTd(28, 1))
+ printf("udbmatch ==> %s\n", p);
+ return p;
+ break;
+
+#ifdef HESIOD
+ case UDB_HESIOD:
+ /* get the default case for this database */
+ if (up->udb_default == NULL)
+ {
+ key.data = ":default:mailname";
+ key.size = strlen(key.data);
+ i = hes_udb_get(&key, &info);
+
+ if (i != 0 || info.size <= 0)
+ {
+ /* no default case */
+ up->udb_default = "";
+ continue;
+ }
+
+ /* save the default case */
+ up->udb_default = xalloc(info.size + 1);
+ bcopy(info.data, up->udb_default, info.size);
+ up->udb_default[info.size] = '\0';
+ free(info.data);
+ }
+ else if (up->udb_default[0] == '\0')
+ continue;
+
+ /* we have a default case -- verify user:maildrop */
+ key.data = keybuf;
+ key.size = keylen;
+ i = hes_udb_get(&key, &info);
+ if (i != 0 || info.size <= 0)
+ {
+ /* nope -- no aliasing for this user */
+ continue;
+ }
+
+ free(info.data);
+ /* they exist -- build the actual address */
+ p = xalloc(strlen(user) + strlen(up->udb_default) + 2);
+ (void) strcpy(p, user);
+ (void) strcat(p, "@");
+ (void) strcat(p, up->udb_default);
+ if (tTd(28, 1))
+ printf("udbmatch ==> %s\n", p);
+ return p;
+ break;
+#endif /* HESIOD */
+ }
+ }
+
+ /* still nothing.... too bad */
+ return NULL;
+}
+\f/*
+** _UDBX_INIT -- parse the UDB specification, opening any valid entries.
+**
+** Parameters:
+** none.
+**
+** Returns:
+** EX_TEMPFAIL -- if it appeared it couldn't get hold of a
+** database due to a host being down or some similar
+** (recoverable) situation.
+** EX_OK -- otherwise.
+**
+** Side Effects:
+** Fills in the UdbEnts structure from UdbSpec.
+*/
projects / unix-history / blobdiff