mdmonitor: use MAILFROM to set sendmail envelope sender address

Modern mail relays may reject emails with unknown envelope sender
address.

Use the MAILFROM address also as envelope sender address to work
around this issue.

Signed-off-by: Martin Wilck <mwilck@suse.com>

diff --git a/mdmonitor.c b/mdmonitor.c
index d51617cd0981ec4a98e19d28bc25e40205d05c72..ea35d98ede303e1418fa355f784a9deaafb014b6 100644 (file)
--- a/mdmonitor.c
+++ b/mdmonitor.c
@@ -639,11 +639,20 @@ static void execute_alert_cmd(const struct event_data *data)
  */
 static void send_event_email(const struct event_data *data)
 {
-       FILE *mp, *mdstat;
+       FILE *mp = NULL, *mdstat;
        char buf[BUFSIZ];
        int n;
 
-       mp = popen(Sendmail, "w");
+       if (info.mailfrom) {
+               char cmd[1024];
+               int rc = snprintf(cmd, sizeof(cmd), "%s -f%s",
+                                 Sendmail, info.mailfrom);
+
+               if (rc >= 0 && (unsigned int)rc < sizeof(cmd))
+                       mp = popen(cmd, "w");
+       }
+       if (mp == NULL)
+               mp = popen(Sendmail, "w");
        if (!mp) {
                pr_err("Cannot open pipe stream for sendmail.\n");
                return;