sendmail: support address lists

Headers To:, Cc: and Bcc: may have a list of comma-separated
addresses. Add support for that. Commas inside double quotes are ignored.

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

1 files changed, 29 insertions, 4 deletions

diff --git a/mailutils/sendmail.c b/mailutils/sendmail.c
index 10a5a85d4..c5df5f5d3 100644
--- a/mailutils/sendmail.c
+++ b/mailutils/sendmail.c
@@ -144,6 +144,33 @@ static void rcptto(const char *s)
                 bb_error_msg("Bad recipient: <%s>", s);
 }
 
+// send to a list of comma separated addresses
+static void rcptto_list(const char *_str)
+{
+        char *str = xstrdup(_str);
+        int len = strlen(str);
+        int in_quote = 0;
+        char *s = str;
+        char prev = 0;
+        int pos;
+
+        for (pos = 0; pos < len; pos++) {
+                char ch = str[pos];
+
+                if (ch == '"' && prev != '\\') {
+                        in_quote = !in_quote;
+                } else if (!in_quote && ch == ',') {
+                        str[pos] = '\0';
+                        rcptto(angle_address(s));
+                        s = str + pos + 1;
+                }
+                prev = ch;
+        }
+        if (prev != ',')
+                rcptto(angle_address(s));
+        free(str);
+}
+
 int sendmail_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
 int sendmail_main(int argc UNUSED_PARAM, char **argv)
 {
@@ -317,14 +344,12 @@ int sendmail_main(int argc UNUSED_PARAM, char **argv)
                 // To: or Cc: headers add recipients
                 if (opts & OPT_t) {
                         if (0 == strncasecmp("To:", s, 3) || 0 == strncasecmp("Bcc:" + 1, s, 3)) {
-                                char *r = xstrdup(s+3);
-                                rcptto(angle_address(r));
-                                free(r);
+                                rcptto_list(s+3);
                                 goto addheader;
                         }
                         // Bcc: header adds blind copy (hidden) recipient
                         if (0 == strncasecmp("Bcc:", s, 4)) {
-                                rcptto(angle_address(s+4));
+                                rcptto_list(s+4);
                                 free(s);
                                 continue; // N.B. Bcc: vanishes from headers!
                         }