From 1cafb5eab0b30e5f5a05737a075123af53153cb1 Mon Sep 17 00:00:00 2001
From: manuel <manuel@mausz.at>
Date: Thu, 17 Aug 2017 13:17:22 +0200
Subject: add support for SMTPUTF8

---
 qmail-remote.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++---
 1 file changed, 91 insertions(+), 5 deletions(-)

(limited to 'qmail-remote.c')

diff --git a/qmail-remote.c b/qmail-remote.c
index 94c6c0d..f8e60ad 100644
--- a/qmail-remote.c
+++ b/qmail-remote.c
@@ -46,6 +46,7 @@ stralloc helohost = {0};
 stralloc routes = {0};
 struct constmap maproutes;
 stralloc host = {0};
+stralloc idnhost = {0};
 stralloc sender = {0};
 stralloc auth_smtp_user = {0};
 stralloc auth_smtp_pass = {0};
@@ -77,13 +78,19 @@ struct val_danestatus *dane_status = NULL;
 struct val_ssl_data *dane_ssl_data = NULL;
 #endif
 
+#ifdef SMTPUTF8
+# include <idn2.h>
+int flagutf8 = 0;
+stralloc header = {0};
+#endif
+
 void out(s) char *s; { if (substdio_puts(subfdoutsmall,s) == -1) _exit(0); }
 void zero() { if (substdio_put(subfdoutsmall,"\0",1) == -1) _exit(0); }
 void zeroflush()  { zero(); substdio_flush(subfdoutsmall); }
 void zerodie() { zeroflush(); _exit(0); }
-void outsafe(sa) stralloc *sa; { int i; char ch;
+void outsafe(sa) stralloc *sa; { int i; unsigned char ch;
 for (i = 0;i < sa->len;++i) {
-ch = sa->s[i]; if (ch < 33) ch = '?'; if (ch > 126) ch = '?';
+ch = sa->s[i]; if (ch < 33) ch = '?'; if (ch > 126 && ch <= 127) ch = '?';
 if (substdio_put(subfdoutsmall,&ch,1) == -1) _exit(0); } }
 
 void temp_nomem() { out("ZOut of memory. (#4.3.0)\n"); zerodie(); }
@@ -346,6 +353,10 @@ void blast()
   int r;
   char ch;
 
+#ifdef SMTPUTF8
+  substdio_put(&smtpto,header.s,header.len);
+#endif
+
   for (;;) {
     r = substdio_get(&ssin,&ch,1);
     if (r == 0) break;
@@ -634,11 +645,60 @@ int tls_init()
 
 stralloc recip = {0};
 
+#ifdef SMTPUTF8
+int utf8string(unsigned char *ch, int len)
+{
+  int i = 0;
+  while (i < len)
+    if (ch[i++] > 127) return 1;
+  return 0;
+}
+
+int utf8received()
+{
+  int r, i, received = 0;
+  char ch;
+  stralloc receivedline = {0};
+
+  for (;;) {                                    /* we consider only our own last written header */
+    r = substdio_get(&ssin,&ch,1);
+    if (r == 0) break;
+    if (r == -1) temp_read();
+
+    if (ch == '\n') {
+      if (!stralloc_append(&header,"\r")) temp_nomem();                 /* received.c does not add '\r' */
+      if (!stralloc_append(&header,"\n")) temp_nomem();
+      if (case_startb(receivedline.s,5,"Date:")) return 0;              /* header to quit asap */
+      if (case_startb(receivedline.s,14,"Received: from")) received++;  /* found Received header */
+      if (received) {
+        if (case_startb(receivedline.s,5,"  by ")) {
+          for (i = 6; i < receivedline.len-6; ++i)
+            if (*(receivedline.s+i) == ' ')
+              if (case_startb(receivedline.s+i+1,9,"with UTF8")) return 1;
+          return 0;
+        }
+      }
+      if (!stralloc_copys(&receivedline,"")) temp_nomem();
+      receivedline.len = 0;
+    } else {
+      if (!stralloc_append(&header,&ch)) temp_nomem();
+      if (!stralloc_catb(&receivedline,&ch,1)) temp_nomem();
+    }
+  }
+  return 0;
+}
+#endif
+
 void mail_without_auth()
 {
   substdio_puts(&smtpto,"MAIL FROM:<");
   substdio_put(&smtpto,sender.s,sender.len);
-  substdio_puts(&smtpto,">\r\n");
+  substdio_put(&smtpto,">",1);
+#ifdef SMTPUTF8
+  if (flagutf8 || utf8received())
+    substdio_puts(&smtpto, " SMTPUTF8");
+#endif
+  substdio_puts(&smtpto,"\r\n");
   substdio_flush(&smtpto);
 }
 
@@ -730,7 +790,12 @@ void smtp()
       substdio_put(&smtpto,sender.s,sender.len);
       substdio_puts(&smtpto,"> AUTH=<");
       substdio_put(&smtpto,sender.s,sender.len);
-      substdio_puts(&smtpto,">\r\n");
+      substdio_put(&smtpto,">",1);
+#ifdef SMTPUTF8
+      if (flagutf8 || utf8received())
+        substdio_puts(&smtpto, " SMTPUTF8");
+#endif
+      substdio_puts(&smtpto,"\r\n");
       substdio_flush(&smtpto);
       if(!stralloc_copys(&auth_status, "Delivered with authenticated connection to \n")) temp_nomem();
       if(!stralloc_0(&auth_status)) temp_nomem();
@@ -902,7 +967,12 @@ stralloc *saout; /* host has to be canonical, box has to be quoted */
 char *s;
 {
   int j;
- 
+
+#ifdef SMTPUTF8
+  if (!flagutf8)
+    flagutf8 = utf8string(s, str_len(s));
+#endif
+
   j = str_rchr(s,'@');
   if (!s[j]) {
     if (!stralloc_copys(saout,s)) temp_nomem();
@@ -983,6 +1053,18 @@ char **argv;
       relayhost[i] = 0;
     }
     if (!stralloc_copys(&host,relayhost)) temp_nomem();
+  } else {
+#ifdef SMTPUTF8
+    char *asciihost = 0;
+    if (!stralloc_0(&host)) temp_nomem();
+    switch (idn2_lookup_u8(host.s,(uint8_t**)&asciihost,IDN2_NFC_INPUT)) {
+      case IDN2_OK: break;
+      case IDN2_MALLOC: temp_nomem();
+      default: perm_dns();
+    }
+    if (!stralloc_copys(&idnhost,asciihost)) temp_nomem();
+    if (!stralloc_0(&idnhost)) temp_nomem();
+#endif
   }
 
 
@@ -1002,7 +1084,11 @@ char **argv;
 
  
   random = now() + (getpid() << 16);
+#ifdef SMTPUTF8
+  switch (relayhost ? dns_ip(&ip,&host) : dns_mxip(&ip,&idnhost,random)) {
+#else
   switch (relayhost ? dns_ip(&ip,&host) : dns_mxip(&ip,&host,random)) {
+#endif
     case DNS_MEM: temp_nomem();
     case DNS_SOFT: temp_dns();
     case DNS_HARD: perm_dns();
-- 
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