blob: 35d105fa51ff54831762a569832f2d3ad56f587f (
plain)
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--- a/tcpdump.c
+++ b/tcpdump.c
@@ -66,6 +66,7 @@ extern int SIZE_BUF;
#include <stdlib.h>
#include <string.h>
#include <limits.h>
+#include <ctype.h>
#ifndef WIN32
#include <sys/wait.h>
#include <sys/resource.h>
@@ -625,6 +626,7 @@ main(int argc, char **argv)
#ifdef HAVE_PCAP_FINDALLDEVS
pcap_if_t *devpointer;
int devnum;
+ char *devp;
#endif
int status;
#ifdef WIN32
@@ -775,7 +777,8 @@ main(int argc, char **argv)
* It can be useful on Windows, where more than
* one interface can have the same name.
*/
- if ((devnum = atoi(optarg)) != 0) {
+ for (devp = optarg; *devp && isdigit(*devp); devp++);
+ if ((!*devp || isspace(*devp)) && (devnum = atoi(optarg)) != 0) {
if (devnum < 0)
error("Invalid adapter index");
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