Adding upstream version 4.96.upstream/4.96upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 294 insertions, 0 deletions

diff --git a/src/lookups/nisplus.c b/src/lookups/nisplus.c
new file mode 100644
index 0000000..d9f3f7d
--- /dev/null
+++ b/src/lookups/nisplus.c
@@ -0,0 +1,294 @@
+/*************************************************
+*     Exim - an Internet mail transport agent    *
+*************************************************/
+
+/* Copyright (c) The Exim Maintainers 2020 - 2022 */
+/* Copyright (c) University of Cambridge 1995 - 2018 */
+/* See the file NOTICE for conditions of use and distribution. */
+
+#include "../exim.h"
+#include "lf_functions.h"
+
+#include <rpcsvc/nis.h>
+
+
+/*************************************************
+*              Open entry point                  *
+*************************************************/
+
+/* See local README for interface description. */
+
+static void *
+nisplus_open(const uschar * filename, uschar ** errmsg)
+{
+return (void *)(1);    /* Just return something non-null */
+}
+
+
+
+/*************************************************
+*               Find entry point                 *
+*************************************************/
+
+/* See local README for interface description. The format of queries for a
+NIS+ search is
+
+  [field=value,...],table-name
+or
+  [field=value,...],table-name:result-field-name
+
+in other words, a normal NIS+ "indexed name", with an optional result field
+name tagged on the end after a colon. If there is no result-field name, the
+yield is the concatenation of all the fields, preceded by their names and an
+equals sign. */
+
+static int
+nisplus_find(void * handle, const uschar * filename, const uschar * query,
+  int length, uschar ** result, uschar ** errmsg, uint * do_cache,
+  const uschar * opts)
+{
+int error_error = FAIL;
+const uschar * field_name = NULL;
+nis_result *nrt = NULL;
+nis_result *nre = NULL;
+nis_object *tno, *eno;
+struct entry_obj *eo;
+struct table_obj *ta;
+const uschar * p = query + length;
+gstring * yield = NULL;
+
+do_cache = do_cache;   /* Placate picky compilers */
+
+/* Search backwards for a colon to see if a result field name
+has been given. */
+
+while (p > query && p[-1] != ':') p--;
+
+if (p > query)		/* get the query without the result-field */
+  {
+  uint len = p-1 - query;
+  field_name = p;
+  query = string_copyn(query, len);
+  p = query + len;
+  }
+else
+  p = query + length;
+
+/* Now search backwards to find the comma that starts the
+table name. */
+
+while (p > query && p[-1] != ',') p--;
+if (p <= query)
+  {
+  *errmsg = US"NIS+ query malformed";
+  error_error = DEFER;
+  goto NISPLUS_EXIT;
+  }
+
+/* Look up the data for the table, in order to get the field names,
+check that we got back a table, and set up pointers so the field
+names can be scanned. */
+
+nrt = nis_lookup(CS p, EXPAND_NAME | NO_CACHE);
+if (nrt->status != NIS_SUCCESS)
+  {
+  *errmsg = string_sprintf("NIS+ error accessing %s table: %s", p,
+    nis_sperrno(nrt->status));
+  if (nrt->status != NIS_NOTFOUND && nrt->status != NIS_NOSUCHTABLE)
+    error_error = DEFER;
+  goto NISPLUS_EXIT;
+  }
+tno = nrt->objects.objects_val;
+if (tno->zo_data.zo_type != TABLE_OBJ)
+  {
+  *errmsg = string_sprintf("NIS+ error: %s is not a table", p);
+  goto NISPLUS_EXIT;
+  }
+ta = &tno->zo_data.objdata_u.ta_data;
+
+/* Now look up the entry in the table, check that we got precisely one
+object and that it is a table entry. */
+
+nre = nis_list(CS query, EXPAND_NAME, NULL, NULL);
+if (nre->status != NIS_SUCCESS)
+  {
+  *errmsg = string_sprintf("NIS+ error accessing entry %s: %s",
+    query, nis_sperrno(nre->status));
+  goto NISPLUS_EXIT;
+  }
+if (nre->objects.objects_len > 1)
+  {
+  *errmsg = string_sprintf("NIS+ returned more than one object for %s",
+    query);
+  goto NISPLUS_EXIT;
+  }
+else if (nre->objects.objects_len < 1)
+  {
+  *errmsg = string_sprintf("NIS+ returned no data for %s", query);
+  goto NISPLUS_EXIT;
+  }
+eno = nre->objects.objects_val;
+if (eno->zo_data.zo_type != ENTRY_OBJ)
+  {
+  *errmsg = string_sprintf("NIS+ error: %s is not an entry", query);
+  goto NISPLUS_EXIT;
+  }
+
+/* Scan the columns in the entry and in the table. If a result field
+was given, look for that field; otherwise concatenate all the fields
+with their names. */
+
+eo = &(eno->zo_data.objdata_u.en_data);
+for (int i = 0; i < eo->en_cols.en_cols_len; i++)
+  {
+  table_col *tc = ta->ta_cols.ta_cols_val + i;
+  entry_col *ec = eo->en_cols.en_cols_val + i;
+  int len = ec->ec_value.ec_value_len;
+  uschar *value = US ec->ec_value.ec_value_val;
+
+  /* The value may be NULL for a zero-length field. Turn this into an
+  empty string for consistency. Remove trailing whitespace and zero
+  bytes. */
+
+  if (!value) value = US"";
+  else
+    while (len > 0 && (value[len-1] == 0 || isspace(value[len-1])))
+      len--;
+
+  /* Concatenate all fields if no specific one selected */
+
+  if (!field_name)
+    {
+    yield = string_cat (yield, US tc->tc_name);
+    yield = string_catn(yield, US"=", 1);
+
+    /* Quote the value if it contains spaces or is empty */
+
+    if (value[0] == 0 || Ustrchr(value, ' ') != NULL)
+      {
+      yield = string_catn(yield, US"\"", 1);
+      for (int j = 0; j < len; j++)
+        {
+        if (value[j] == '\"' || value[j] == '\\')
+          yield = string_catn(yield, US"\\", 1);
+        yield = string_catn(yield, value+j, 1);
+        }
+      yield = string_catn(yield, US"\"", 1);
+      }
+    else
+      yield = string_catn(yield, value, len);
+
+    yield = string_catn(yield, US" ", 1);
+    }
+
+  /* When the specified field is found, grab its data and finish */
+
+  else if (Ustrcmp(field_name, tc->tc_name) == 0)
+    {
+    yield = string_catn(yield, value, len);
+    goto NISPLUS_EXIT;
+    }
+  }
+
+/* Error if a field name was specified and we didn't find it; if no
+field name, ensure the concatenated data is zero-terminated. */
+
+if (field_name)
+  *errmsg = string_sprintf("NIS+ field %s not found for %s", field_name,
+    query);
+else
+  gstring_release_unused(yield);
+
+/* Free result store before finishing. */
+
+NISPLUS_EXIT:
+if (nrt) nis_freeresult(nrt);
+if (nre) nis_freeresult(nre);
+
+if (yield)
+  {
+  *result = string_from_gstring(yield);
+  return OK;
+  }
+
+return error_error;      /* FAIL or DEFER */
+}
+
+
+
+/*************************************************
+*               Quote entry point                *
+*************************************************/
+
+/* The only quoting that is necessary for NIS+ is to double any doublequote
+characters. No options are recognized.
+
+Arguments:
+  s          the string to be quoted
+  opt        additional option text or NULL if none
+  idx	     lookup type index
+
+Returns:     the processed string or NULL for a bad option
+*/
+
+static uschar *
+nisplus_quote(uschar * s, uschar * opt, unsigned idx)
+{
+int count = 0;
+uschar * quoted, * t = s;
+
+if (opt) return NULL;    /* No options recognized */
+
+while (*t) if (*t++ == '\"') count++;
+
+t = quoted = store_get_quoted(Ustrlen(s) + count + 1, s, idx);
+
+while (*s)
+  {
+  *t++ = *s;
+  if (*s++ == '\"') *t++ = '\"';
+  }
+
+*t = 0;
+return quoted;
+}
+
+
+/*************************************************
+*         Version reporting entry point          *
+*************************************************/
+
+/* See local README for interface description. */
+
+#include "../version.h"
+
+gstring *
+nisplus_version_report(gstring * g)
+{
+#ifdef DYNLOOKUP
+g = string_fmt_append(g, "Library version: NIS+: Exim version %s\n", EXIM_VERSION_STR);
+#endif
+return g;
+}
+
+
+static lookup_info _lookup_info = {
+  .name = US"nisplus",			/* lookup name */
+  .type = lookup_querystyle,		/* query-style lookup */
+  .open = nisplus_open,			/* open function */
+  .check = NULL,			/* check function */
+  .find = nisplus_find,			/* find function */
+  .close = NULL,			/* no close function */
+  .tidy = NULL,				/* no tidy function */
+  .quote = nisplus_quote,		/* quoting function */
+  .version_report = nisplus_version_report         /* version reporting */
+};
+
+#ifdef DYNLOOKUP
+#define nisplus_lookup_module_info _lookup_module_info
+#endif
+
+static lookup_info *_lookup_list[] = { &_lookup_info };
+lookup_module_info nisplus_lookup_module_info = { LOOKUP_MODULE_INFO_MAGIC, _lookup_list, 1 };
+
+/* End of lookups/nisplus.c */