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/qbiff.c | 141 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 141 insertions(+)
 create mode 100644 src/qbiff.c

(limited to 'src/qbiff.c')

diff --git a/src/qbiff.c b/src/qbiff.c
new file mode 100644
index 0000000..b9b55bf
--- /dev/null
+++ b/src/qbiff.c
@@ -0,0 +1,141 @@
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#include "hasutmp.h"
+#ifdef HASUTMP
+#include <utmp.h>
+#ifndef UTMP_FILE
+#ifdef _PATH_UTMP
+#define UTMP_FILE _PATH_UTMP
+#else
+#define UTMP_FILE "/etc/utmp"
+#endif
+#endif
+#else
+#include <utmpx.h> 
+#endif
+#include "stralloc.h"
+#include "buffer.h"
+#include "open.h"
+#include "byte.h"
+#include "str.h"
+#include "headerbody.h"
+#include "hfield.h"
+#include "env.h"
+#include "exit.h"
+
+buffer b;
+#ifdef HASUTMP
+char bufutmp[sizeof(struct utmp) * 16];
+int fdutmp;
+#endif
+char buftty[1024];
+int fdtty;
+
+#ifdef HASUTMP
+struct utmp ut;
+char line[sizeof(ut.ut_line) + 1];
+#else
+struct utmpx *ut;
+char line[sizeof(ut->ut_line) + 1];
+#endif
+
+stralloc woof = {0};
+stralloc tofrom = {0};
+stralloc text = {0};
+
+void doit(char *s, int n)
+{
+  if (!stralloc_catb(&text,s,n)) _exit(0);
+  if (text.len > 78) text.len = 78;
+}
+
+void dobody(stralloc *h) { doit(h->s,h->len); }
+
+void doheader(stralloc *h)
+{
+  int i;
+
+  if (hfield_known(h->s,h->len) == H_SUBJECT) {
+    i = hfield_skipname(h->s,h->len);
+    doit(h->s + i,h->len - i);
+  }
+}
+
+void finishheader() { ; }
+
+int main()
+{
+  char *user;
+  char *sender;
+  char *userext;
+  struct stat st;
+  int i;
+
+  if (chdir("/dev") == -1) _exit(0);
+
+  if (!(user = env_get("USER"))) _exit(0);
+  if (!(sender = env_get("SENDER"))) _exit(0);
+  if (!(userext = env_get("LOCAL"))) _exit(0);
+#ifdef HASUTMP
+  if (str_len(user) > sizeof(ut.ut_name)) _exit(0);
+#else
+  if (str_len(user) > sizeof(ut->ut_user)) _exit(0);
+#endif
+
+  if (!stralloc_copys(&tofrom,"*** TO <")) _exit(0);
+  if (!stralloc_cats(&tofrom,userext)) _exit(0);
+  if (!stralloc_cats(&tofrom,"> FROM <")) _exit(0);
+  if (!stralloc_cats(&tofrom,sender)) _exit(0);
+  if (!stralloc_cats(&tofrom,">")) _exit(0);
+
+  for (i = 0; i < tofrom.len; ++i)
+    if ((tofrom.s[i] < 32) || (tofrom.s[i] > 126))
+      tofrom.s[i] = '_';
+
+  if (!stralloc_copys(&text,"    ")) _exit(0);
+  if (headerbody(buffer_0,doheader,finishheader,dobody) == -1) _exit(0);
+
+  for (i = 0; i < text.len; ++i)
+    if ((text.s[i] < 32) || (text.s[i] > 126))
+      text.s[i] = '/';
+
+  if (!stralloc_copys(&woof,"\015\n\007")) _exit(0);
+  if (!stralloc_cat(&woof,&tofrom)) _exit(0);
+  if (!stralloc_cats(&woof,"\015\n")) _exit(0);
+  if (!stralloc_cat(&woof,&text)) _exit(0);
+  if (!stralloc_cats(&woof,"\015\n")) _exit(0);
+
+#ifdef HASUTMP
+  fdutmp = open_read(UTMP_FILE);
+  if (fdutmp == -1) _exit(0);
+  buffer_init(&b,read,fdutmp,bufutmp,sizeof(bufutmp));
+
+  while (buffer_get(&b,&ut,sizeof(ut)) == sizeof(ut))
+    if (!str_diffn(ut.ut_name,user,sizeof(ut.ut_name))) {
+#else
+  while ((ut = getutxent()) != 0)
+    if (ut->ut_type == USER_PROCESS && !str_diffn(ut->ut_user,user,sizeof(ut->ut_user))) {
+#endif
+#ifdef HASUTMP
+      byte_copy(line,sizeof(ut.ut_line),ut.ut_line);
+      line[sizeof(ut.ut_line)] = 0;
+#else
+      byte_copy(line,sizeof(ut->ut_line),ut->ut_line);
+      line[sizeof(ut->ut_line)] = 0;
+#endif
+      if (line[0] == '/') continue;
+      if (!line[0]) continue;
+      if (line[str_chr(line,'.')]) continue;
+
+      fdtty = open_append(line);
+      if (fdtty == -1) continue;
+      if (fstat(fdtty,&st) == -1) { close(fdtty); continue; }
+      if (!(st.st_mode & 0100)) { close(fdtty); continue; }
+      if (st.st_uid != getuid()) { close(fdtty); continue; }
+      buffer_init(&b,write,fdtty,buftty,sizeof(buftty));
+      buffer_putflush(&b,woof.s,woof.len);
+      close(fdtty);
+    }
+  _exit(0);
+}
-- 
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