90 lines
2.1 KiB
Diff
90 lines
2.1 KiB
Diff
--- iputils-s20121112/arping.c.orig 2012-11-13 12:12:51.000000000 +0100
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+++ iputils-s20121112/arping.c 2012-11-13 12:15:11.514261164 +0100
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@@ -50,7 +50,7 @@
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static void usage(void) __attribute__((noreturn));
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int quit_on_reply=0;
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-char *device="eth0";
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+char *device=NULL;
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int ifindex;
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char *source;
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struct in_addr src, dst;
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@@ -71,6 +71,10 @@ struct timeval start, last;
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int sent, brd_sent;
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int received, brd_recv, req_recv;
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+#define PREF_ETH "eth"
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+#define PREF_EM "em"
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+static char *dev_file = "/proc/self/net/dev";
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+
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#ifndef CAPABILITIES
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static uid_t euid;
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#endif
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@@ -524,6 +528,46 @@ static void set_device_broadcast(char *d
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return;
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}
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+/*
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+ * get_first_ethernet - return the name of the first ethernet-style
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+ * interface on this system.
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+ */
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+char * get_first_ethernet(void)
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+{
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+ FILE *f;
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+ char buf[255], *dv, *smc;
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+ char pci[16];
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+
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+ memset(pci, 0, sizeof(pci));
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+ if ((f = fopen(dev_file, "r")) != NULL)
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+ {
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+ // go through network dev file
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+ while (fgets (buf, sizeof(buf), f) != NULL)
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+ {
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+ // the line describes interface
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+ if ((smc = strchr(buf, ':')) != NULL)
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+ {
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+ // trim white characters
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+ for (dv=buf, *smc=0; *dv <= ' '; dv++) ;
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+ // is "eth" (originial ethernet name) or "em" (ethernet on board)
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+ if (!strncmp(dv, PREF_ETH, strlen(PREF_ETH)) ||
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+ !strncmp(dv, PREF_EM, strlen(PREF_EM)))
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+ {
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+ return strdup(dv);
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+ }
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+ // remember the first pci NIC-card
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+ if (strlen(pci) == 0 && dv[0] == 'p' && isdigit(dv[1]))
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+ {
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+ strcpy(pci, dv);
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+ }
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+ }
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+ }
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+ fclose(f);
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+ }
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+ // return pci NIC-card or nil if no if name
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+ return strlen(pci) > 0 ? strdup(pci) : 0L;
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+}
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+
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int
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main(int argc, char **argv)
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{
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@@ -543,6 +587,8 @@ main(int argc, char **argv)
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disable_capability_raw();
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+ device = get_first_ethernet();
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+
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while ((ch = getopt(argc, argv, "h?bfDUAqc:w:s:I:V")) != EOF) {
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switch(ch) {
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case 'b':
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@@ -569,6 +615,10 @@ main(int argc, char **argv)
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timeout = atoi(optarg);
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break;
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case 'I':
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+ if (device) {
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+ free(device);
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+ device = NULL;
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+ }
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device = strdup(optarg);
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break;
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case 'f':
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