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authorTobias Klauser <tklauser@distanz.ch>2018-02-13 10:23:05 +0100
committerTobias Klauser <tklauser@distanz.ch>2018-02-13 10:23:05 +0100
commit731920807329ef1a6b26790296aa2c079435f18e (patch)
tree0865bc00710646166e8d435384452160df4bab22 /llmnr-query.c
parent2994da82694a0da977a23f7dfa68cdd1e96507ac (diff)
llmnr-query: add option to set conflict bit in LLMNR header flags
Allows testing llmnrd behavior in presence of conflicts. Updates #25 Signed-off-by: Tobias Klauser <tklauser@distanz.ch>
Diffstat (limited to 'llmnr-query.c')
-rw-r--r--llmnr-query.c15
1 files changed, 11 insertions, 4 deletions
diff --git a/llmnr-query.c b/llmnr-query.c
index e5d3557..59d0f17 100644
--- a/llmnr-query.c
+++ b/llmnr-query.c
@@ -1,7 +1,7 @@
/*
* Simple LLMNR (RFC 4795) query tool.
*
- * Copyright (C) 2015-2017 Tobias Klauser <tklauser@distanz.ch>
+ * Copyright (C) 2015-2018 Tobias Klauser <tklauser@distanz.ch>
*
* This file is part of llmnrd.
*
@@ -42,7 +42,7 @@
/* Maximum possible size RFC 4795, section 2.1 */
static const size_t LLMNR_QUERY_PKT_BUF_SIZE = 9194;
-static const char *short_ops = "c:d:i:I:t:T:6hV";
+static const char *short_ops = "c:d:i:I:t:T:6ChV";
static const struct option long_opts[] = {
{ "count", required_argument, NULL, 'c' },
{ "id", required_argument, NULL, 'd' },
@@ -50,6 +50,7 @@ static const struct option long_opts[] = {
{ "interface", required_argument, NULL, 'I' },
{ "timeout", required_argument, NULL, 't' },
{ "type", required_argument, NULL, 'T' },
+ { "conflict", no_argument, NULL, 'C' },
{ "ipv6", no_argument, NULL, '6' },
{ "help", no_argument, NULL, 'h' },
{ "version", no_argument, NULL, 'V' },
@@ -67,6 +68,7 @@ static void __noreturn usage_and_exit(int status)
" -t, --timeout NUM time to wait for reply in ms (default: 1000)\n"
" -T, --type TYPE set query type; must be one of A, AAAA, ANY (default: ANY)\n"
" -6, --ipv6 send queries over IPv6\n"
+ " -C, --conflict set conflict bit in query\n"
" -h, --help show this help and exit\n"
" -V, --version show version information and exit\n");
exit(status);
@@ -75,7 +77,7 @@ static void __noreturn usage_and_exit(int status)
static void __noreturn version_and_exit(void)
{
fprintf(stdout, "llmnr-query %s %s\n"
- "Copyright (C) 2015-2017 Tobias Klauser <tklauser@distanz.ch>\n"
+ "Copyright (C) 2015-2018 Tobias Klauser <tklauser@distanz.ch>\n"
"Licensed under the GNU General Public License, version 2\n",
VERSION_STRING, GIT_VERSION);
exit(EXIT_SUCCESS);
@@ -101,6 +103,7 @@ int main(int argc, char **argv)
const char *query_name, *iface = NULL;
size_t query_name_len;
unsigned long i, id = 0, count = 1, interval_ms = 500, timeout_ms = 1000;
+ uint16_t flags = 0;
uint16_t qtype = LLMNR_QTYPE_ANY;
bool ipv6 = false;
struct pkt *p;
@@ -112,6 +115,9 @@ int main(int argc, char **argv)
case 'c':
count = strtoul(optarg, NULL, 0);
break;
+ case 'C':
+ flags |= LLMNR_F_C;
+ break;
case 'd':
id = strtoul(optarg, NULL, 0);
break;
@@ -141,6 +147,7 @@ int main(int argc, char **argv)
break;
case 'V':
version_and_exit();
+ /* fall through */
case 'h':
usage_and_exit(EXIT_SUCCESS);
default:
@@ -235,7 +242,7 @@ int main(int argc, char **argv)
hdr = (struct llmnr_hdr *)pkt_put(p, sizeof(*hdr));
hdr->id = htons(id + i % UINT16_MAX);
- hdr->flags = 0;
+ hdr->flags = htons(flags);
hdr->qdcount = htons(1);
hdr->ancount = 0;
hdr->nscount = 0;