res_pjsip: Strip spaces from items parsed from comma-separated lists

Configurations like "aors = a, b, c" were either ignoring everything after "a"
or trying to look up " b".  Same for mailboxes,  ciphers, contacts and a few
others.

To fix, all the strsep(&copy, ",") calls have been wrapped in ast_strip.  To
facilitate this, ast_strip, ast_skip_blanks and ast_skip_nonblanks were
updated to handle null pointers.

In some cases, an ast_strlen_zero() test was added to skip consecutive commas.

There was also an attempt to ast_free an ast_strdupa'd string in
ast_sip_for_each_aor which was causing a SEGV.  I removed it.

Although this issue was reported for realtime, the issue was in the res_pjsip
modules so all config mechanisms were affected.

ASTERISK-25829 #close
Reported-by: Mateusz Kowalski

Change-Id: I0b22a2cf22a7c1c50d4ecacbfa540155bec0e7a2

1 files changed, 5 insertions, 1 deletions

diff --git a/res/res_pjsip_endpoint_identifier_ip.c b/res/res_pjsip_endpoint_identifier_ip.c
index f73bdae7e..016e0b4ad 100644
--- a/res/res_pjsip_endpoint_identifier_ip.c
+++ b/res/res_pjsip_endpoint_identifier_ip.c
@@ -164,11 +164,15 @@ static int ip_identify_match_handler(const struct aco_option *opt, struct ast_va
 		return 0;
 	}
 
-	while ((current_string = strsep(&input_string, ","))) {
+	while ((current_string = ast_strip(strsep(&input_string, ",")))) {
 		struct ast_sockaddr *addrs;
 		int num_addrs = 0, error = 0, i;
 		char *mask = strrchr(current_string, '/');
 
+		if (ast_strlen_zero(current_string)) {
+			continue;
+		}
+
 		if (mask) {
 			identify->matches = ast_append_ha("d", current_string, identify->matches, &error);