sendmail: support long header fields for recipients

Support long header fields in To:, Cc: and Bcc: headers.

Signed-off-by: Aaro Koskinen <aaro.koskinen@iki.fi>
Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

1 files changed, 18 insertions, 1 deletions

diff --git a/mailutils/sendmail.c b/mailutils/sendmail.c
index c5df5f5d3..22f735b3d 100644
--- a/mailutils/sendmail.c
+++ b/mailutils/sendmail.c
@@ -181,6 +181,12 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
         char *host = sane_address(safe_gethostname());
         unsigned nheaders = 0;
         int code;
+        enum {
+                HDR_OTHER = 0,
+                HDR_TOCC,
+                HDR_BCC,
+        } last_hdr = 0;
+        int check_hdr;
 
         enum {
         //--- standard options
@@ -345,20 +351,31 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
                 if (opts & OPT_t) {
                         if (0 == strncasecmp("To:", s, 3) || 0 == strncasecmp("Bcc:" + 1, s, 3)) {
                                 rcptto_list(s+3);
+                                last_hdr = HDR_TOCC;
                                 goto addheader;
                         }
                         // Bcc: header adds blind copy (hidden) recipient
                         if (0 == strncasecmp("Bcc:", s, 4)) {
                                 rcptto_list(s+4);
                                 free(s);
+                                last_hdr = HDR_BCC;
                                 continue; // N.B. Bcc: vanishes from headers!
                         }
                 }
-                if (strchr(s, ':') || (list && isspace(s[0]))) {
+                check_hdr = list && isspace(s[0]);
+                if (strchr(s, ':') || check_hdr) {
                         // other headers go verbatim
                         // N.B. RFC2822 2.2.3 "Long Header Fields" allows for headers to occupy several lines.
                         // Continuation is denoted by prefixing additional lines with whitespace(s).
                         // Thanks (stefan.seyfried at googlemail.com) for pointing this out.
+                        if (check_hdr && last_hdr != HDR_OTHER) {
+                                rcptto_list(s+1);
+                                if (last_hdr == HDR_BCC)
+                                        continue;
+                                        // N.B. Bcc: vanishes from headers!
+                        } else {
+                                last_hdr = HDR_OTHER;
+                        }
  addheader:
                         // N.B. we allow MAX_HEADERS generic headers at most to prevent attacks
                         if (MAX_HEADERS && ++nheaders >= MAX_HEADERS)