sendmail: do not discard all headers

1 files changed, 11 insertions, 3 deletions

diff --git a/networking/sendmail.c b/networking/sendmail.c
index 2332f6afb..653f2e60a 100644
--- a/networking/sendmail.c
+++ b/networking/sendmail.c
@@ -375,6 +375,7 @@ int sendgetmail_main(int argc UNUSED_PARAM, char **argv)
                 const char *p;
                 char *q;
                 llist_t *l;
+                llist_t *headers = NULL;
 
                 // recipients specified as arguments
                 while (*argv) {
@@ -390,6 +391,7 @@ int sendgetmail_main(int argc UNUSED_PARAM, char **argv)
                 // N.B. subject read from body has priority
                 // over that specified on command line.
                 // recipients are merged
+                // N.B. other headers are collected and will be dumped verbatim
                 if (opts & OPTS_t || !opt_recipients) {
                         // fetch recipients and (optionally) subject
                         char *s;
@@ -402,11 +404,12 @@ int sendgetmail_main(int argc UNUSED_PARAM, char **argv)
 */                              } else if (0 == strncmp("Subject: ", s, 9)) {
                                         opt_subject = s+9;
                                         opts |= OPTS_s;
+                                } else if (s[0]) {
+                                        // misc header
+                                        llist_add_to_end(&headers, s);
                                 } else {
-                                        char first = s[0];
                                         free(s);
-                                        if (!first)
-                                                break; // empty line
+                                        break; // empty line
                                 }
                         }
                 }
@@ -476,6 +479,11 @@ int sendgetmail_main(int argc UNUSED_PARAM, char **argv)
                 if (opts & OPTS_N)
                         printf("Disposition-Notification-To: %s\r\n", opt_from);
 
+                // put headers we could have preread with -t
+                for (l = headers; l; l = l->link) {
+                        printf("%s\r\n", l->data);
+                }
+
                 // make a random string -- it will delimit message parts
                 srand(monotonic_us());
                 boundary = xasprintf("%d-%d-%d", rand(), rand(), rand());