Diff of /tags/mkinitrd-6_2_0/networking/arp.c

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	revision 532 by niro, Sat Sep 1 22:45:15 2007 UTC	revision 816 by niro, Fri Apr 24 18:33:46 2009 UTC
#	Line 13	Line 13
13	* modified for getopt32 by Arne Bernin <arne [at] alamut.de>	* modified for getopt32 by Arne Bernin <arne [at] alamut.de>
14	*/	*/
15
16	#include "busybox.h"	#include "libbb.h"
17	#include "inet_common.h"	#include "inet_common.h"
18
19	#include <arpa/inet.h>	#include <arpa/inet.h>
#	Line 27	Line 27
27	#define DFLT_AF "inet"	#define DFLT_AF "inet"
28	#define DFLT_HW "ether"	#define DFLT_HW "ether"
29
	#define _PATH_PROCNET_ARP "/proc/net/arp"
30	#define ARP_OPT_A (0x1)	#define ARP_OPT_A (0x1)
31	#define ARP_OPT_p (0x2)	#define ARP_OPT_p (0x2)
32	#define ARP_OPT_H (0x4)	#define ARP_OPT_H (0x4)
#	Line 46  static const struct aftype *ap; /* curre	Line 44  static const struct aftype *ap; /* curre
44	static const struct hwtype *hw; /* current hardware type        */	static const struct hwtype *hw; /* current hardware type        */
45	static int sockfd;              /* active socket descriptor     */	static int sockfd;              /* active socket descriptor     */
46	static smallint hw_set;         /* flag if hw-type was set (-H) */	static smallint hw_set;         /* flag if hw-type was set (-H) */
47	static char *device = "";       /* current device               */	static const char *device = ""; /* current device               */
48
49	static const char *const options[] = {	static const char options[] ALIGN1 =
50	"pub",	"pub\0"
51	"priv",	"priv\0"
52	"temp",	"temp\0"
53	"trail",	"trail\0"
54	"dontpub",	"dontpub\0"
55	"auto",	"auto\0"
56	"dev",	"dev\0"
57	"netmask",	"netmask\0";
	NULL
	};
58
59	/* Delete an entry from the ARP cache. */	/* Delete an entry from the ARP cache. */
60	/* Called only from main, once */	/* Called only from main, once */
61	static int arp_del(char **args)	static int arp_del(char **args)
62	{	{
63	char host[128];	char *host;
64	struct arpreq req;	struct arpreq req;
65	struct sockaddr sa;	struct sockaddr sa;
66	int flags = 0;	int flags = 0;
#	Line 73  static int arp_del(char **args)	Line 69  static int arp_del(char **args)
69	memset(&req, 0, sizeof(req));	memset(&req, 0, sizeof(req));
70
71	/* Resolve the host name. */	/* Resolve the host name. */
72	safe_strncpy(host, *args, 128);	host = *args;
73	if (ap->input(0, host, &sa) < 0) {	if (ap->input(host, &sa) < 0) {
74	bb_herror_msg_and_die("%s", host);	bb_herror_msg_and_die("%s", host);
75	}	}
76
#	Line 87  static int arp_del(char **args)	Line 83  static int arp_del(char **args)
83	req.arp_flags = ATF_PERM;	req.arp_flags = ATF_PERM;
84	args++;	args++;
85	while (*args != NULL) {	while (*args != NULL) {
86	switch (index_in_str_array(options, *args)) {	switch (index_in_strings(options, *args)) {
87	case 0: /* "pub" */	case 0: /* "pub" */
88	flags |= 1;	flags |= 1;
89	args++;	args++;
#	Line 130  static int arp_del(char **args)	Line 126  static int arp_del(char **args)
126	if (*++args == NULL)	if (*++args == NULL)
127	bb_show_usage();	bb_show_usage();
128	if (strcmp(*args, "255.255.255.255") != 0) {	if (strcmp(*args, "255.255.255.255") != 0) {
129	safe_strncpy(host, *args, 128);	host = *args;
130	if (ap->input(0, host, &sa) < 0) {	if (ap->input(host, &sa) < 0) {
131	bb_herror_msg_and_die("%s", host);	bb_herror_msg_and_die("%s", host);
132	}	}
133	memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));	memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
#	Line 190  static void arp_getdevhw(char *ifname, s	Line 186  static void arp_getdevhw(char *ifname, s
186	const struct hwtype *xhw;	const struct hwtype *xhw;
187
188	strcpy(ifr.ifr_name, ifname);	strcpy(ifr.ifr_name, ifname);
189	if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0) {	ioctl_or_perror_and_die(sockfd, SIOCGIFHWADDR, &ifr,
190	bb_perror_msg_and_die("cant get HW-Address for '%s'", ifname);	"cant get HW-Address for '%s'", ifname);
	}
191	if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {	if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
192	bb_error_msg_and_die("protocol type mismatch");	bb_error_msg_and_die("protocol type mismatch");
193	}	}
#	Line 205  static void arp_getdevhw(char *ifname, s	Line 200  static void arp_getdevhw(char *ifname, s
200	}	}
201	bb_error_msg("device '%s' has HW address %s '%s'",	bb_error_msg("device '%s' has HW address %s '%s'",
202	ifname, xhw->name,	ifname, xhw->name,
203	xhw->print((char *) &ifr.ifr_hwaddr.sa_data));	xhw->print((unsigned char *) &ifr.ifr_hwaddr.sa_data));
204	}	}
205	}	}
206
#	Line 213  static void arp_getdevhw(char *ifname, s	Line 208  static void arp_getdevhw(char *ifname, s
208	/* Called only from main, once */	/* Called only from main, once */
209	static int arp_set(char **args)	static int arp_set(char **args)
210	{	{
211	char host[128];	char *host;
212	struct arpreq req;	struct arpreq req;
213	struct sockaddr sa;	struct sockaddr sa;
214	int flags;	int flags;
215
216	memset(&req, 0, sizeof(req));	memset(&req, 0, sizeof(req));
217
218	safe_strncpy(host, *args++, 128);	host = *args++;
219	if (ap->input(0, host, &sa) < 0) {	if (ap->input(host, &sa) < 0) {
220	bb_herror_msg_and_die("%s", host);	bb_herror_msg_and_die("%s", host);
221	}	}
222	/* If a host has more than one address, use the correct one! */	/* If a host has more than one address, use the correct one! */
#	Line 242  static int arp_set(char **args)	Line 237  static int arp_set(char **args)
237	/* Check out any modifiers. */	/* Check out any modifiers. */
238	flags = ATF_PERM | ATF_COM;	flags = ATF_PERM | ATF_COM;
239	while (*args != NULL) {	while (*args != NULL) {
240	switch (index_in_str_array(options, *args)) {	switch (index_in_strings(options, *args)) {
241	case 0: /* "pub" */	case 0: /* "pub" */
242	flags |= ATF_PUBL;	flags |= ATF_PUBL;
243	args++;	args++;
#	Line 285  static int arp_set(char **args)	Line 280  static int arp_set(char **args)
280	if (*++args == NULL)	if (*++args == NULL)
281	bb_show_usage();	bb_show_usage();
282	if (strcmp(*args, "255.255.255.255") != 0) {	if (strcmp(*args, "255.255.255.255") != 0) {
283	safe_strncpy(host, *args++, 128);	host = *args;
284	if (ap->input(0, host, &sa) < 0) {	if (ap->input(host, &sa) < 0) {
285	bb_herror_msg_and_die("%s", host);	bb_herror_msg_and_die("%s", host);
286	}	}
287	memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));	memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
#	Line 308  static int arp_set(char **args)	Line 303  static int arp_set(char **args)
303	/* Call the kernel. */	/* Call the kernel. */
304	if (option_mask32 & ARP_OPT_v)	if (option_mask32 & ARP_OPT_v)
305	bb_error_msg("SIOCSARP()");	bb_error_msg("SIOCSARP()");
306	if (ioctl(sockfd, SIOCSARP, &req) < 0) {	xioctl(sockfd, SIOCSARP, &req);
	bb_perror_msg_and_die("SIOCSARP");
	}
307	return 0;	return 0;
308	}	}
309
310
311	/* Print the contents of an ARP request block. */	/* Print the contents of an ARP request block. */
312	static void	static void
313	arp_disp(char *name, char *ip, int type, int arp_flags,	arp_disp(const char *name, char *ip, int type, int arp_flags,
314	char *hwa, char *mask, char *dev)	char *hwa, char *mask, char *dev)
315	{	{
316		static const int arp_masks[] = {
317		ATF_PERM, ATF_PUBL,
318		#ifdef HAVE_ATF_MAGIC
319		ATF_MAGIC,
320		#endif
321		#ifdef HAVE_ATF_DONTPUB
322		ATF_DONTPUB,
323		#endif
324		ATF_USETRAILERS,
325		};
326		static const char arp_labels[] ALIGN1 = "PERM\0""PUP\0"
327		#ifdef HAVE_ATF_MAGIC
328		"AUTO\0"
329		#endif
330		#ifdef HAVE_ATF_DONTPUB
331		"DONTPUB\0"
332		#endif
333		"TRAIL\0"
334		;
335
336	const struct hwtype *xhw;	const struct hwtype *xhw;
337
338	xhw = get_hwntype(type);	xhw = get_hwntype(type);
#	Line 340  arp_disp(char *name, char *ip, int type,	Line 353  arp_disp(char *name, char *ip, int type,
353	if (arp_flags & ATF_NETMASK)	if (arp_flags & ATF_NETMASK)
354	printf("netmask %s ", mask);	printf("netmask %s ", mask);
355
356	if (arp_flags & ATF_PERM)	print_flags_separated(arp_masks, arp_labels, arp_flags, " ");
357	printf("PERM ");	printf(" on %s\n", dev);
	if (arp_flags & ATF_PUBL)
	printf("PUP ");
	#ifdef HAVE_ATF_MAGIC
	if (arp_flags & ATF_MAGIC)
	printf("AUTO ");
	#endif
	#ifdef HAVE_ATF_DONTPUB
	if (arp_flags & ATF_DONTPUB)
	printf("DONTPUB ");
	#endif
	if (arp_flags & ATF_USETRAILERS)
	printf("TRAIL ");
	printf("on %s\n", dev);
358	}	}
359
360	/* Display the contents of the ARP cache in the kernel. */	/* Display the contents of the ARP cache in the kernel. */
361	/* Called only from main, once */	/* Called only from main, once */
362	static int arp_show(char *name)	static int arp_show(char *name)
363	{	{
364	char host[100];	const char *host;
365		const char *hostname;
366		FILE *fp;
367	struct sockaddr sa;	struct sockaddr sa;
	char ip[100];
	char hwa[100];
	char mask[100];
	char line[200];
	char dev[100];
368	int type, flags;	int type, flags;
	FILE *fp;
	char *hostname;
369	int num;	int num;
370	unsigned entries = 0, shown = 0;	unsigned entries = 0, shown = 0;
371		char ip[128];
372		char hwa[128];
373		char mask[128];
374		char line[128];
375		char dev[128];
376
377	host[0] = '\0';	host = NULL;
378	if (name != NULL) {	if (name != NULL) {
379	/* Resolve the host name. */	/* Resolve the host name. */
380	safe_strncpy(host, name, (sizeof host));	if (ap->input(name, &sa) < 0) {
381	if (ap->input(0, host, &sa) < 0) {	bb_herror_msg_and_die("%s", name);
	bb_herror_msg_and_die("%s", host);
382	}	}
383	safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host));	host = xstrdup(ap->sprint(&sa, 1));
384	}	}
385	/* Open the PROCps kernel table. */	fp = xfopen_for_read("/proc/net/arp");
386	fp = xfopen(_PATH_PROCNET_ARP, "r");	/* Bypass header -- read one line */
387	/* Bypass header -- read until newline */	fgets(line, sizeof(line), fp);
388	if (fgets(line, sizeof(line), fp) != (char *) NULL) {
389		/* Read the ARP cache entries. */
390		while (fgets(line, sizeof(line), fp)) {
391
392	mask[0] = '-'; mask[1] = '\0';	mask[0] = '-'; mask[1] = '\0';
393	dev[0] = '-'; dev[1] = '\0';	dev[0] = '-'; dev[1] = '\0';
394	/* Read the ARP cache entries. */	/* All these strings can't overflow
395	for (; fgets(line, sizeof(line), fp);) {	* because fgets above reads limited amount of data */
396	num = sscanf(line, "%s 0x%x 0x%x %100s %100s %100s\n",	num = sscanf(line, "%s 0x%x 0x%x %s %s %s\n",
397	ip, &type, &flags, hwa, mask, dev);	ip, &type, &flags, hwa, mask, dev);
398	if (num < 4)	if (num < 4)
399	break;	break;
400
401	entries++;	entries++;
402	/* if the user specified hw-type differs, skip it */	/* if the user specified hw-type differs, skip it */
403	if (hw_set && (type != hw->type))	if (hw_set && (type != hw->type))
404	continue;	continue;
405
406	/* if the user specified address differs, skip it */	/* if the user specified address differs, skip it */
407	if (host[0] && strcmp(ip, host) != 0)	if (host && strcmp(ip, host) != 0)
408	continue;	continue;
409
410	/* if the user specified device differs, skip it */	/* if the user specified device differs, skip it */
411	if (device[0] && strcmp(dev, device) != 0)	if (device[0] && strcmp(dev, device) != 0)
412	continue;	continue;
413
414	shown++;	shown++;
415	/* This IS ugly but it works -be */	/* This IS ugly but it works -be */
416	if (option_mask32 & ARP_OPT_n)	hostname = "?";
417		if (!(option_mask32 & ARP_OPT_n)) {
418		if (ap->input(ip, &sa) < 0)
419		hostname = ip;
420		else
421		hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
422		if (strcmp(hostname, ip) == 0)
423	hostname = "?";	hostname = "?";
	else {
	if (ap->input(0, ip, &sa) < 0)
	hostname = ip;
	else
	hostname = ap->sprint(&sa, (option_mask32 & ARP_OPT_n) | 0x8000);
	if (strcmp(hostname, ip) == 0)
	hostname = "?";
	}
	arp_disp(hostname, ip, type, flags, hwa, mask, dev);
424	}	}
425
426		arp_disp(hostname, ip, type, flags, hwa, mask, dev);
427	}	}
428	if (option_mask32 & ARP_OPT_v)	if (option_mask32 & ARP_OPT_v)
429	printf("Entries: %d\tSkipped: %d\tFound: %d\n",	printf("Entries: %d\tSkipped: %d\tFound: %d\n",
430	entries, entries - shown, shown);	entries, entries - shown, shown);
431
432	if (!shown) {	if (!shown) {
433	if (hw_set || host[0] || device[0])	if (hw_set || host || device[0])
434	printf("No match found in %d entries\n", entries);	printf("No match found in %d entries\n", entries);
435	}	}
436		if (ENABLE_FEATURE_CLEAN_UP) {
437	fclose(fp);	free((char*)host);
438		fclose(fp);
439		}
440	return 0;	return 0;
441	}	}
442
443	int arp_main(int argc, char **argv)	int arp_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE;
444		int arp_main(int argc UNUSED_PARAM, char **argv)
445	{	{
446	char *hw_type;	const char *hw_type = "ether";
447	char *protocol;	const char *protocol;
448
449	/* Initialize variables... */	/* Initialize variables... */
450	ap = get_aftype(DFLT_AF);	ap = get_aftype(DFLT_AF);
451	if (!ap)	if (!ap)
452	bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");	bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
453
454	getopt32(argc, argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,	getopt32(argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
455	&hw_type, &hw_type, &device);	&hw_type, &hw_type, &device);
456	argv += optind;	argv += optind;
457	if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {	if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {

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