+#ifndef DISABLE_WELLKNOWN
+/*************************************************
+* The "wellknown" ACL modifier *
+*************************************************/
+
+/* Called by acl_check_condition() below.
+
+Retrieve the given file and encode content as xtext.
+Prefix with a summary line giving the length of plaintext.
+Leave a global pointer to the whole, for output by
+the smtp verb handler code (smtp_in.c).
+
+Arguments:
+ arg the option string for wellknown=
+ log_msgptr for error messages
+
+Returns: OK/FAIL
+*/
+
+static int
+wellknown_process(const uschar * arg, uschar ** log_msgptr)
+{
+struct stat statbuf;
+FILE * rf;
+gstring * g;
+
+wellknown_response = NULL;
+if (f.no_multiline_responses) return FAIL;
+
+/* Check for file existence */
+
+if (!*arg) return FAIL;
+if (Ustat(arg, &statbuf) != 0)
+ { *log_msgptr = US"stat"; goto fail; }
+
+/*XXX perhaps refuse to serve a group- or world-writeable file? */
+
+if (!(rf = Ufopen(arg, "r")))
+ { *log_msgptr = US"open"; goto fail; }
+
+/* Set up summary line for output */
+
+g = string_fmt_append(NULL, "SIZE=%lu\n", (long) statbuf.st_size);
+
+#define LINE_LIM 75
+for (int n = 0, ch; (ch = fgetc(rf)) != EOF; )
+ {
+ /* Xtext-encode, adding output linebreaks for input linebreaks
+ or when the line gets long enough */
+
+ if (ch == '\n')
+ { g = string_fmt_append(g, "+%02X", ch); n = LINE_LIM; }
+ else if (ch < 33 || ch > 126 || ch == '+' || ch == '=')
+ { g = string_fmt_append(g, "+%02X", ch); n += 3; }
+ else
+ { g = string_fmt_append(g, "%c", ch); n++; }
+
+ if (n >= LINE_LIM)
+ { g = string_catn(g, US"\n", 1); n = 0; }
+ }
+#undef LINE_LIM
+
+gstring_release_unused(g);
+wellknown_response = string_from_gstring(g);
+return OK;
+
+fail:
+ *log_msgptr = string_sprintf("wellknown: failed to %s file \"%s\": %s",
+ *log_msgptr, arg, strerror(errno));
+ return FAIL;
+}
+#endif
+
+
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