From 89b7b67a13ebb7965cc7f13ad0595e2194a2d34c Mon Sep 17 00:00:00 2001
From: Jannis Hoffmann <jannis@fehcom.de>
Date: Wed, 3 Jul 2024 15:48:04 +0200
Subject: add sqmail-4.2.29a

---
 src/dnsmxip.c | 106 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 106 insertions(+)
 create mode 100644 src/dnsmxip.c

(limited to 'src/dnsmxip.c')

diff --git a/src/dnsmxip.c b/src/dnsmxip.c
new file mode 100644
index 0000000..de3bb7c
--- /dev/null
+++ b/src/dnsmxip.c
@@ -0,0 +1,106 @@
+#include <sys/types.h>
+#include <sys/socket.h>
+#include <unistd.h>
+#include "buffer.h"
+#include "stralloc.h"
+#include "fmt.h"
+#include "dnsresolv.h"
+#include "ip.h"
+#include "now.h"
+#include "exit.h"
+#include "dns.h"
+#include "logmsg.h"
+#include "str.h"
+
+#define WHO "dnsmxip"
+
+static stralloc sa = {0};
+static stralloc ia = {0}; 
+static stralloc out = {0};
+static stralloc ipaddr = {0}; 
+
+int dns_ia(stralloc *ip,char *s)
+{
+  int i;
+  int j = 0;
+  int r = 0;
+  char ip4str[IP4_FMT];
+  char ip6str[IP6_FMT];
+
+  if (!stralloc_copys(&sa,s)) return -1;
+  if (sa.s[sa.len-1] != '.')
+    if (!stralloc_append(&sa,".")) return -1;
+  if (!stralloc_copys(ip,"")) return -1;
+ 
+  DNS_INIT 
+  if (dns_ip6(&ia,&sa) > 0) {
+    for (i = 0; i + 16 <= ia.len; i += 16) {
+      if (ip6_isv4mapped(ia.s + i)) continue; 
+      j = ip6_fmt(ip6str,ia.s + i);
+      r += j;
+      if (!stralloc_catb(ip,ip6str,j)) return -1;
+      if (!stralloc_cats(ip," ")) return -1;
+      r++;
+    }
+  }
+
+  if (dns_ip4(&ia,&sa) > 0) {
+    for (i = 0; i + 4 <= ia.len; i += 4) {
+      j = ip4_fmt(ip4str,ia.s + i);
+      r += j;
+      if (!stralloc_catb(ip,ip4str,j)) return -1;
+      if (!stralloc_cats(ip," ")) return -1;
+      r++;
+    }
+  }
+  if (!stralloc_0(ip)) return -1;
+
+  return r?r-1:0;
+}
+
+int main(int argc,char **argv)
+{
+  int j, k, r;
+  uint16 u;
+  int len;
+  char num[FMT_ULONG];
+
+  if (!argv[1]) 
+    logmsg(WHO,100,USAGE,"dnsmx fqdn");
+  if (!stralloc_copys(&sa,argv[1]))
+    logmsg(WHO,111,FATAL,"out of memory");
+
+  DNS_INIT 
+  if ((r = dns_mx(&out,&sa)) < 0) _exit(1);
+  if (r > 0) {
+    j = len = 0;
+    do {
+      j = str_chr(out.s + len + 2,'\0');
+      k = dns_ia(&ipaddr,out.s + len + 2);        /* IP */
+      if (k) {
+        buffer_put(buffer_1,out.s + len + 2,j);   /* MX */
+        buffer_puts(buffer_1,": ");
+        out.s[len + 3] = '\0';
+        uint16_unpack_big(out.s + len,&u);	 
+        buffer_put(buffer_1,num,fmt_ulong(num,u)) ;
+        buffer_puts(buffer_1," [");
+        buffer_put(buffer_1,ipaddr.s,k);
+        buffer_puts(buffer_1,"]");
+      }
+      buffer_putsflush(buffer_1,"\n");
+      len += j + 3;
+    } while (len < out.len);
+  } else {                                       /* A/AAAA */
+    k = dns_ia(&ipaddr,argv[1]);                 /* IP */
+    if (k) {
+      buffer_puts(buffer_1,argv[1]); 
+      buffer_puts(buffer_1,": -");
+      buffer_puts(buffer_1," [");
+      buffer_put(buffer_1,ipaddr.s,k);
+      buffer_puts(buffer_1,"]");
+      buffer_putsflush(buffer_1,"\n");
+    } 
+  }
+
+  _exit(0);
+}
-- 
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