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Diffstat (limited to 'llmnr-query.c')
-rw-r--r--llmnr-query.c11
1 files changed, 8 insertions, 3 deletions
diff --git a/llmnr-query.c b/llmnr-query.c
index e35a00e..fefcf0b 100644
--- a/llmnr-query.c
+++ b/llmnr-query.c
@@ -36,9 +36,10 @@
#include "log.h"
#include "pkt.h"
-static const char *short_ops = "c:i:I:t:T:6hV";
+static const char *short_ops = "c:d:i:I:t:T:6hV";
static const struct option long_opts[] = {
{ "count", required_argument, NULL, 'c' },
+ { "id", required_argument, NULL, 'd' },
{ "interval", required_argument, NULL, 'i' },
{ "interface", required_argument, NULL, 'I' },
{ "timeout", required_argument, NULL, 't' },
@@ -54,6 +55,7 @@ static void __noreturn usage_and_exit(int status)
fprintf(stdout, "Usage: llmnr-query [OPTIONS...] NAME\n"
"Options:\n"
" -c, --count NUM number of queries to send (default: 1)\n"
+ " -d, --id NUM set LLMNR transaction id (default: 0)\n"
" -i, --interval NUM interval between queries in ms (default: 500)\n"
" -I, --interface NAME send multicast over specified interface\n"
" -t, --timeout NUM time to wait for reply in ms (default: 1000)\n"
@@ -92,7 +94,7 @@ int main(int argc, char **argv)
int c, sock;
const char *query_name, *iface = NULL;
size_t query_name_len;
- unsigned long i, count = 1, interval_ms = 500, timeout_ms = 1000;
+ unsigned long i, id = 0, count = 1, interval_ms = 500, timeout_ms = 1000;
uint16_t qtype = LLMNR_QTYPE_ANY;
bool ipv6 = false;
struct pkt *p;
@@ -103,6 +105,9 @@ int main(int argc, char **argv)
case 'c':
count = strtoul(optarg, NULL, 0);
break;
+ case 'd':
+ id = strtoul(optarg, NULL, 0);
+ break;
case 'i':
interval_ms = strtoul(optarg, NULL, 0);
break;
@@ -217,7 +222,7 @@ int main(int argc, char **argv)
int ret;
hdr = (struct llmnr_hdr *)pkt_put(p, sizeof(*hdr));
- hdr->id = htons(i % UINT16_MAX);
+ hdr->id = htons(id + i % UINT16_MAX);
hdr->flags = 0;
hdr->qdcount = htons(1);
hdr->ancount = 0;