From bfac22dc79164bab10185188e12cee313ab96de9 Mon Sep 17 00:00:00 2001
From: James <31272717+gpd-pocket-hacker@users.noreply.github.com>
Date: Mon, 9 Nov 2020 16:10:37 +0000
Subject: add email support

---
 email.c | 112 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 112 insertions(+)
 create mode 100644 email.c

(limited to 'email.c')

diff --git a/email.c b/email.c
new file mode 100644
index 0000000..31c22b8
--- /dev/null
+++ b/email.c
@@ -0,0 +1,112 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <string.h>
+#include <syslog.h>
+#include <fcntl.h>
+#include <unistd.h>
+
+#include "email.h"
+
+
+
+static int daemonish (int nochdir, int noclose)
+{
+  if (!nochdir && chdir ("/"))
+    return -1;
+
+  if (!noclose) {
+    int fd, failed = 0;
+
+    if ((fd = open ("/dev/null", O_RDWR)) < 0) return -1;
+
+    if (dup2 (fd, 0) < 0 || dup2 (fd, 1) < 0 || dup2 (fd, 2) < 0)
+      failed++;
+
+    if (fd > 2) close (fd);
+
+    if (failed) return -1;
+  }
+
+  switch (fork()) {
+  case 0:
+    break;
+
+  case -1:
+    return -1;
+
+  default:
+    return 1;;
+  }
+
+  if (setsid() < 0) return -1;
+
+  switch (fork()) {
+  case 0:
+    break;
+
+  case -1:
+    return -1;
+
+  default:
+    _exit (0);
+  }
+
+  return 0;
+}
+
+
+static void write_complete (int fd, const void *_buf, size_t len)
+{
+  ssize_t writ;
+  const char *buf = _buf;
+
+  while (len) {
+    writ = write (fd, buf, len);
+
+    if (writ <= 0) return;
+
+    len -= writ;
+    buf += writ;
+  }
+}
+
+
+static void write_str (int fd, const char *str)
+{
+  write_complete (fd, str, strlen (str));
+}
+
+void  send_email (const char *to, const char *subject, const char *body)
+{
+  int pipes[2];
+
+  if (daemonish (0, 1)) return;
+
+  pipe (pipes);
+
+
+  switch (fork()) {
+  case 0:
+    close (pipes[1]);
+    dup2 (pipes[0], 0);
+    close (pipes[0]);
+
+    execl ("/usr/lib/sendmail", "sendmail", to, (char *) 0);
+    _exit (1);
+
+  case -1:
+    _exit (1);
+  }
+
+  close (pipes[0]);
+
+  write_str (pipes[1], "Subject: ");
+  write_str (pipes[1], subject);
+  write_str (pipes[1], "\n\n");
+  write_str (pipes[1], body);
+  write_str (pipes[1], "\n\n");
+  close (pipes[1]);
+
+  _exit (0);
+}
-- 
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