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