vrcptcheck is a recipient check for e.h. s/qmail

Just call this program within /var/qmail/control/recipients as follows:

cat /home/vpopmail/bin/vrcptcheck > /var/qmail/control/recipients

You have to provide an "autoreconf -f -i" before configuring, as the original
Makefile.am has been modified.

Roberto Puzzanghera, https://notes.sagredo.eu, Sep 23, 2021

======================================================================================================

diff -ruN vpopmail-5.4.33-original/Makefile.am vpopmail-5.4.33/Makefile.am
--- vpopmail-5.4.33-original/Makefile.am	2011-02-28 18:00:45.000000000 +0100
+++ vpopmail-5.4.33/Makefile.am	2021-09-23 19:01:43.513865014 +0200
@@ -31,7 +31,7 @@
  vdeldomain vpasswd vadduser vdeluser vaddaliasdomain vsetuserquota \
  vpopbull vdeloldusers vmoduser valias vuserinfo vmkpasswd vipmap \
  vdominfo vconvert vkill vmoddomlimits vchangepw dotqmail2valias \
- vpopmaild vlist authvchkpw vusagec
+ vpopmaild vlist authvchkpw vusagec vrcptcheck
 
 vusagec_SOURCES = vusagec.c client.c conf.c ippp.c
 vusagec_LDADD = libvpopmail.a @auth_libs@
@@ -114,6 +114,9 @@
 vmoddomlimits_SOURCES = vmoddomlimits.c
 vmoddomlimits_LDADD = libvpopmail.a  @auth_libs@
 
+vrcptcheck_SOURCES = vrcptcheck.c
+vrcptcheck_LDADD = libvpopmail.a  @auth_libs@
+
 DEFS=-I. @auth_inc@ 
 
 install: install-recursive vusage-msg
diff -ruN vpopmail-5.4.33-original/doc/README.vrcptcheck vpopmail-5.4.33/doc/README.vrcptcheck
--- vpopmail-5.4.33-original/doc/README.vrcptcheck	1970-01-01 01:00:00.000000000 +0100
+++ vpopmail-5.4.33/doc/README.vrcptcheck	2021-09-23 19:03:14.620060288 +0200
@@ -0,0 +1,8 @@
+vrcptcheck is a recipient check for s/qmail
+
+Just call this program within /var/qmail/control/recipients as follows:
+
+cat /home/vpopmail/bin/vrcptcheck > /var/qmail/control/recipients
+
+You have to provide an "autoreconf -f -i" before configuring, as the original
+Makefiele.am has been modified.
diff -ruN vpopmail-5.4.33-original/vrcptcheck.c vpopmail-5.4.33/vrcptcheck.c
--- vpopmail-5.4.33-original/vrcptcheck.c	1970-01-01 01:00:00.000000000 +0100
+++ vpopmail-5.4.33/vrcptcheck.c	2021-09-24 13:42:48.251707925 +0200
@@ -0,0 +1,62 @@
+/*
+ * $Id: vrcptcheck.c 2021-09-23
+ * Roberto Puzzanghera - https://notes.sagredo.eu
+ *
+ * Recipient check for s/qmail.
+ * Just call this program within /var/qmail/control/recipients as follows:
+ * cat /home/vpopmail/bin/vrcptcheck > /var/qmail/control/recipients
+
+ * @file vrcptcheck.c
+   @return 0: virtual user exists
+           1: virtual user does not exist
+           111: temporary problem
+ */
+
+#include <dirent.h>
+#include <memory.h>
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include "vpopmail.h"
+
+#define FDAUTH 3
+char inputbuf[MAX_BUFF];
+
+void pam_exit(int fail, DIR *dir)
+{
+	int i;
+	close(FDAUTH);
+	for (i = 0; i < sizeof(inputbuf); ++i) inputbuf[i] = 0;
+	if (dir != NULL) closedir(dir);
+	vexit(fail);
+}
+
+void main(int argc, char *argv[])
+{
+	char path[MAX_BUFF];
+	DIR *dir;
+
+        /* read input */
+        if (read(FDAUTH, inputbuf, sizeof(inputbuf)) == -1)
+        {
+                fprintf(stderr, "qmail-smtpd: Error while reading file descriptor in vrcptcheck\n");
+                pam_exit(111,NULL);
+        }
+        close(FDAUTH);
+
+        /* retrieve username/domain (assuming that MAV has already been done) */
+        int i = 0;
+        char *p = strtok (inputbuf, "@");
+        char *recipient[2];
+        while (p != NULL)
+        {
+                recipient[i++] = p;
+                p = strtok (NULL, "@");
+        }
+
+	/* recipient check */
+	snprintf(path, MAX_BUFF, "%s/%s", vget_assign(recipient[1], NULL, 0, NULL, NULL), recipient[0]);
+	dir = opendir(path);
+	if (dir) pam_exit(0, dir);
+	else pam_exit(1, dir);
+}