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/qreceipt.c | 130 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 130 insertions(+)
 create mode 100644 src/qreceipt.c

(limited to 'src/qreceipt.c')

diff --git a/src/qreceipt.c b/src/qreceipt.c
new file mode 100644
index 0000000..8dacf40
--- /dev/null
+++ b/src/qreceipt.c
@@ -0,0 +1,130 @@
+#include <unistd.h>
+#include "sig.h"
+#include "env.h"
+#include "error.h"
+#include "buffer.h"
+#include "stralloc.h"
+#include "getln.h"
+#include "alloc.h"
+#include "str.h"
+#include "hfield.h"
+#include "token822.h"
+#include "headerbody.h"
+#include "exit.h"
+#include "open.h"
+#include "quote.h"
+#include "qmail.h"
+
+#define WHO "qreceipt"
+
+void die_noreceipt() { _exit(0); }
+void die() { _exit(100); }
+void die_temp() { _exit(111); }
+void die_nomem() {
+ buffer_putsflush(buffer_2,"qreceipt: fatal: out of memory\n"); die_temp(); }
+void die_fork() {
+ buffer_putsflush(buffer_2,"qreceipt: fatal: unable to fork\n"); die_temp(); }
+void die_qqperm() {
+ buffer_putsflush(buffer_2,"qreceipt: fatal: permanent qmail-queue error\n"); die(); }
+void die_qqtemp() {
+ buffer_putsflush(buffer_2,"qreceipt: fatal: temporary qmail-queue error\n"); die_temp(); }
+void die_usage() {
+ buffer_putsflush(buffer_2,
+ "qreceipt: usage: qreceipt deliveryaddress\n"); die(); }
+void die_read() {
+ if (errno == ENOMEM) die_nomem();
+ buffer_putsflush(buffer_2,"qreceipt: fatal: read error\n"); die_temp(); }
+void doordie(sa,r) stralloc *sa; int r; {
+ if (r == 1) return; if (r == -1) die_nomem();
+ buffer_putsflush(buffer_2,"qreceipt: fatal: unable to parse this: ");
+ buffer_putflush(buffer_2,sa->s,sa->len); die(); }
+
+char *target;
+
+int flagreceipt = 0;
+
+char *returnpath;
+stralloc messageid = {0};
+stralloc sanotice = {0};
+
+int rwnotice(token822_alloc *addr)
+{
+  token822_reverse(addr);
+  if (token822_unquote(&sanotice,addr) != 1) die_nomem();
+  if (sanotice.len == str_len(target))
+    if (!str_diffn(sanotice.s,target,sanotice.len))
+      flagreceipt = 1;
+  token822_reverse(addr); 
+  return 1; 
+}
+
+struct qmail qqt;
+
+stralloc quoted = {0};
+
+void finishheader()
+{
+  char *qqx;
+
+  if (!flagreceipt) die_noreceipt();
+  if (str_equal(returnpath,"")) die_noreceipt();
+  if (str_equal(returnpath,"#@[]")) die_noreceipt();
+
+  if (!quote2(&quoted,returnpath)) die_nomem();
+
+  if (qmail_open(&qqt) == -1) die_fork();
+
+  qmail_puts(&qqt,"From: DELIVERY NOTICE SYSTEM <");
+  qmail_put(&qqt,quoted.s,quoted.len);
+  qmail_puts(&qqt,">\n");
+  qmail_puts(&qqt,"To: <");
+  qmail_put(&qqt,quoted.s,quoted.len);
+  qmail_puts(&qqt,">\n");
+  qmail_puts(&qqt,"Subject: success notice\n\
+\n\
+Hi! This is the qreceipt program. Your message was delivered to the\n\
+following address: ");
+  qmail_puts(&qqt,target);
+  qmail_puts(&qqt,". Thanks for asking.\n");
+  if (messageid.s) {
+    qmail_puts(&qqt,"Your ");
+    qmail_put(&qqt,messageid.s,messageid.len);
+  }
+
+  qmail_from(&qqt,"");
+  qmail_to(&qqt,returnpath);
+  qqx = qmail_close(&qqt);
+
+  if (*qqx)
+    if (*qqx == 'D') die_qqperm();
+    else die_qqtemp();
+}
+
+stralloc hfbuf = {0};
+token822_alloc hfin = {0};
+token822_alloc hfrewrite = {0};
+token822_alloc hfaddr = {0};
+
+void doheaderfield(stralloc *h)
+{
+  switch (hfield_known(h->s,h->len)) {
+    case H_MESSAGEID:
+      if (!stralloc_copy(&messageid,h)) die_nomem();
+      break;
+    case H_NOTICEREQUESTEDUPONDELIVERYTO:
+      doordie(h,token822_parse(&hfin,h,&hfbuf));
+      doordie(h,token822_addrlist(&hfrewrite,&hfaddr,&hfin,rwnotice));
+      break;
+  }
+}
+
+void dobody(stralloc *h) { ; }
+
+int main(int argc, char **argv)
+{
+  sig_pipeignore();
+  if (!(target = argv[1])) die_usage();
+  if (!(returnpath = env_get("SENDER"))) die_usage();
+  if (headerbody(buffer_0,doheaderfield,finishheader,dobody) == -1) die_read();
+  die_noreceipt();
+}
-- 
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