svn commit: trunk/busybox/networking

vda at busybox.net vda at busybox.net
Sun Jan 7 19:35:12 UTC 2007


Author: vda
Date: 2007-01-07 11:35:11 -0800 (Sun, 07 Jan 2007)
New Revision: 17182

Log:
I *always* forgotting svn add


Added:
   trunk/busybox/networking/arp.c


Changeset:
Added: trunk/busybox/networking/arp.c
===================================================================
--- trunk/busybox/networking/arp.c	                        (rev 0)
+++ trunk/busybox/networking/arp.c	2007-01-07 19:35:11 UTC (rev 17182)
@@ -0,0 +1,500 @@
+/* vi: set sw=4 ts=4: */
+/*
+ * arp.c - Manipulate the system ARP cache
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version
+ * 2 of the License, or (at your option) any later version.
+ *
+ * Author: Fred N. van Kempen, <waltje at uwalt.nl.mugnet.org>
+ * Busybox port: Paul van Gool <pvangool at mimotech.com>
+ *
+ * modified for getopt32 by Arne Bernin <arne [at] alamut.de>
+ */
+
+#include "busybox.h"
+#include "inet_common.h"
+
+#include <arpa/inet.h>
+#include <net/if.h>
+#include <net/if_arp.h>
+#include <netinet/ether.h>
+#include <netpacket/packet.h>
+
+#define DEBUG 0
+
+#define DFLT_AF "inet"
+#define DFLT_HW "ether"
+
+#define _PATH_PROCNET_ARP "/proc/net/arp"
+
+#define	ARP_OPT_A (0x1)
+#define	ARP_OPT_p (0x2)
+#define	ARP_OPT_H (0x4)
+#define	ARP_OPT_t (0x8)
+#define	ARP_OPT_i (0x10)
+#define	ARP_OPT_a (0x20)
+#define	ARP_OPT_d (0x40)
+#define	ARP_OPT_n (0x80)	/* do not resolve addresses     */
+#define	ARP_OPT_D (0x100)	/* HW-address is devicename     */
+#define	ARP_OPT_s (0x200)
+#define	ARP_OPT_v (0x400 * DEBUG)	/* debugging output flag        */
+
+
+static const struct aftype *ap; /* current address family       */
+static const struct hwtype *hw; /* current hardware type        */
+static int sockfd;              /* active socket descriptor     */
+static smallint hw_set;         /* flag if hw-type was set (-H) */
+static char *device = "";       /* current device               */
+
+static const char *const options[] = {
+	"pub",
+	"priv",
+	"temp",
+	"trail",
+	"dontpub",
+	"auto",
+	"dev",
+	"netmask",
+	NULL
+};
+
+/* Delete an entry from the ARP cache. */
+/* Called only from main, once */
+static int arp_del(char **args)
+{
+	char host[128];
+	struct arpreq req;
+	struct sockaddr sa;
+	int flags = 0;
+	int err;
+
+	memset(&req, 0, sizeof(req));
+
+	/* Resolve the host name. */
+	safe_strncpy(host, *args, 128);
+	if (ap->input(0, host, &sa) < 0) {
+		bb_herror_msg_and_die("%s", host);
+	}
+
+	/* If a host has more than one address, use the correct one! */
+	memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
+
+	if (hw_set)
+		req.arp_ha.sa_family = hw->type;
+
+	req.arp_flags = ATF_PERM;
+	args++;
+	while (*args != NULL) {
+		if (option_mask32 & ARP_OPT_v)
+			bb_error_msg("args=%s", *args);
+
+		switch (index_in_str_array(options, *args)) {
+		case 0: // "pub"
+			flags |= 1;
+			args++;
+			break;
+		case 1: // "priv"
+			flags |= 2;
+			args++;
+			break;
+		case 2: // "temp"
+			req.arp_flags &= ~ATF_PERM;
+			args++;
+			break;
+		case 3: // "trail"
+			req.arp_flags |= ATF_USETRAILERS;
+			args++;
+			break;
+		case 4: // "dontpub"
+#ifdef HAVE_ATF_DONTPUB
+			req.arp_flags |= ATF_DONTPUB;
+#else
+			bb_error_msg("feature ATF_DONTPUB is not supported");
+#endif
+			args++;
+			break;
+		case 5: // "auto"
+#ifdef HAVE_ATF_MAGIC
+			req.arp_flags |= ATF_MAGIC;
+#else
+			bb_error_msg("feature ATF_MAGIC is not supported");
+#endif
+			args++;
+			break;
+		case 6: // "dev"
+			if (*++args == NULL)
+				bb_show_usage();
+			device = *args;
+			args++;
+			break;
+		case 7: // "netmask"
+			if (*++args == NULL)
+				bb_show_usage();
+			if (strcmp(*args, "255.255.255.255") != 0) {
+				safe_strncpy(host, *args, 128);
+				if (ap->input(0, host, &sa) < 0) {
+					bb_herror_msg("%s", host);
+					return -1;
+				}
+				memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
+				req.arp_flags |= ATF_NETMASK;
+			}
+			args++;
+			break;
+		default:
+			bb_show_usage();
+			break;
+		}
+	}
+	if (flags == 0)
+		flags = 3;
+
+	strncpy(req.arp_dev, device, sizeof(req.arp_dev));
+
+	err = -1;
+
+	/* Call the kernel. */
+	if (flags & 2) {
+		if (option_mask32 & ARP_OPT_v)
+			bb_error_msg("SIOCDARP(nopub)");
+		err = ioctl(sockfd, SIOCDARP, &req);
+		if (err < 0) {
+			if (errno == ENXIO) {
+				if (flags & 1)
+					goto nopub;
+				printf("No ARP entry for %s\n", host);
+				return -1;
+			}
+			bb_perror_msg_and_die("SIOCDARP(priv)");
+		}
+	}
+	if ((flags & 1) && err) {
+ nopub:
+		req.arp_flags |= ATF_PUBL;
+		if (option_mask32 & ARP_OPT_v)
+			bb_error_msg("SIOCDARP(pub)");
+		if (ioctl(sockfd, SIOCDARP, &req) < 0) {
+			if (errno == ENXIO) {
+				printf("No ARP entry for %s\n", host);
+				return -1;
+			}
+			bb_perror_msg_and_die("SIOCDARP(pub)");
+		}
+	}
+	return 0;
+}
+
+/* Get the hardware address to a specified interface name */
+static void
+arp_getdevhw(char *ifname, struct sockaddr *sa, const struct hwtype *hwt)
+{
+	struct ifreq ifr;
+	const struct hwtype *xhw;
+
+	strcpy(ifr.ifr_name, ifname);
+	if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0) {
+		bb_perror_msg_and_die("cant get HW-Address for '%s'", ifname);
+	}
+	if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
+		bb_error_msg_and_die("protocol type mismatch");
+	}
+	memcpy(sa, &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
+
+	if (option_mask32 & ARP_OPT_v) {
+		xhw = get_hwntype(ifr.ifr_hwaddr.sa_family);
+		if (!xhw || !xhw->print) {
+			xhw = get_hwntype(-1);
+		}
+		bb_error_msg("device '%s' has HW address %s '%s'",
+					 ifname, xhw->name,
+					 xhw->print((char *) &ifr.ifr_hwaddr.sa_data));
+	}
+}
+
+/* Set an entry in the ARP cache. */
+/* Called only from main, once */
+static int arp_set(char **args)
+{
+	char host[128];
+	struct arpreq req;
+	struct sockaddr sa;
+	int flags;
+	
+	memset(&req, 0, sizeof(req));
+
+	safe_strncpy(host, *args++, 128);
+	if (ap->input(0, host, &sa) < 0) {
+		bb_herror_msg_and_die("%s", host);
+	}
+	/* If a host has more than one address, use the correct one! */
+	memcpy(&req.arp_pa, &sa, sizeof(struct sockaddr));
+
+	/* Fetch the hardware address. */
+	if (*args == NULL) {
+		bb_error_msg_and_die("need hardware address");
+	}
+	if (option_mask32 & ARP_OPT_D) {
+		arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL);
+	} else {
+		if (hw->input(*args++, &req.arp_ha) < 0) {
+			bb_error_msg_and_die("invalid hardware address");
+		}
+	}
+
+	/* Check out any modifiers. */
+	flags = ATF_PERM | ATF_COM;
+	while (*args != NULL) {
+		switch (index_in_str_array(options, *args)) {
+		case 0: // "pub"
+			flags |= ATF_PUBL;
+			args++;
+			break;
+		case 1: // "priv"
+			flags &= ~ATF_PUBL;
+			args++;
+			break;
+		case 2: // "temp"
+			flags &= ~ATF_PERM;
+			args++;
+			break;
+		case 3: // "trail"
+			flags |= ATF_USETRAILERS;
+			args++;
+			break;
+		case 4: // "dontpub"
+#ifdef HAVE_ATF_DONTPUB
+			flags |= ATF_DONTPUB;
+#else
+			bb_error_msg("feature ATF_DONTPUB is not supported");
+#endif
+			args++;
+			break;
+		case 5: // "auto"
+#ifdef HAVE_ATF_MAGIC
+			flags |= ATF_MAGIC;
+#else
+			bb_error_msg("feature ATF_MAGIC is not supported");
+#endif
+			args++;
+			break;
+		case 6: // "dev"
+			if (*++args == NULL)
+				bb_show_usage();
+			device = *args;
+			args++;
+			break;
+		case 7: // "netmask"
+			if (*++args == NULL)
+				bb_show_usage();
+			if (strcmp(*args, "255.255.255.255") != 0) {
+				safe_strncpy(host, *args++, 128);
+				if (ap->input(0, host, &sa) < 0) {
+					bb_herror_msg_and_die("%s", host);
+				}
+				memcpy(&req.arp_netmask, &sa, sizeof(struct sockaddr));
+				flags |= ATF_NETMASK;
+			}
+			args++;
+			break;
+		default:
+			bb_show_usage();
+			break;
+		}
+	}
+
+	/* Fill in the remainder of the request. */
+	req.arp_flags = flags;
+
+	strncpy(req.arp_dev, device, sizeof(req.arp_dev));
+
+	/* Call the kernel. */
+	if (option_mask32 & ARP_OPT_v)
+		bb_error_msg("SIOCSARP()");
+	if (ioctl(sockfd, SIOCSARP, &req) < 0) {
+		bb_perror_msg_and_die("SIOCSARP");
+	}
+	return 0;
+}
+
+
+/* Print the contents of an ARP request block. */
+static void
+arp_disp(char *name, char *ip, int type, int arp_flags,
+		 char *hwa, char *mask, char *dev)
+{
+	const struct hwtype *xhw;
+
+	xhw = get_hwntype(type);
+	if (xhw == NULL)
+		xhw = get_hwtype(DFLT_HW);
+
+	printf("%s (%s) at ", name, ip);
+
+	if (!(arp_flags & ATF_COM)) {
+		if (arp_flags & ATF_PUBL)
+			printf("* ");
+		else
+			printf("<incomplete> ");
+	} else {
+		printf("%s [%s] ", hwa, xhw->name);
+	}
+
+	if (arp_flags & ATF_NETMASK)
+		printf("netmask %s ", mask);
+
+	if (arp_flags & ATF_PERM)
+		printf("PERM ");
+	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);
+}
+
+/* Display the contents of the ARP cache in the kernel. */
+/* Called only from main, once */
+static int arp_show(char *name)
+{
+	char host[100];
+	struct sockaddr sa;
+	char ip[100];
+	char hwa[100];
+	char mask[100];
+	char line[200];
+	char dev[100];
+	int type, flags;
+	FILE *fp;
+	char *hostname;
+	int num, entries = 0, shown = 0;
+
+	host[0] = '\0';
+
+	if (name != NULL) {
+		/* Resolve the host name. */
+		safe_strncpy(host, name, (sizeof host));
+		if (ap->input(0, host, &sa) < 0) {
+			bb_herror_msg_and_die("%s", host);
+		}
+		safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host));
+	}
+	/* Open the PROCps kernel table. */
+	fp = xfopen(_PATH_PROCNET_ARP, "r");
+	/* Bypass header -- read until newline */
+	if (fgets(line, sizeof(line), fp) != (char *) NULL) {
+		mask[0] = '-'; mask[1] = '\0';
+		dev[0] = '-'; dev[1] = '\0';
+		/* Read the ARP cache entries. */
+		for (; fgets(line, sizeof(line), fp);) {
+			num = sscanf(line, "%s 0x%x 0x%x %100s %100s %100s\n",
+						 ip, &type, &flags, hwa, mask, dev);
+			if (num < 4)
+				break;
+
+			entries++;
+			/* if the user specified hw-type differs, skip it */
+			if (hw_set && (type != hw->type))
+				continue;
+
+			/* if the user specified address differs, skip it */
+			if (host[0] && strcmp(ip, host) != 0)
+				continue;
+
+			/* if the user specified device differs, skip it */
+			if (device && strcmp(dev, device) != 0)
+				continue;
+
+			shown++;
+			/* This IS ugly but it works -be */
+			if (option_mask32 & ARP_OPT_n)
+				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);
+		}
+	}
+	if (option_mask32 & ARP_OPT_v)
+		printf("Entries: %d\tSkipped: %d\tFound: %d\n",
+			   entries, entries - shown, shown);
+
+	if (!shown) {
+		if (hw_set || host[0] || device)
+			printf("No match found in %d entries\n", entries);
+	}
+
+	fclose(fp);
+
+	return 0;
+}
+
+int arp_main(int argc, char **argv)
+{
+	char *hw_type;
+	char *protocol;
+
+	/* Initialize variables... */
+	ap = get_aftype(DFLT_AF);
+	if (!ap)
+		bb_error_msg_and_die("%s: %s not supported", DFLT_AF, "address family");
+
+	getopt32(argc, argv, "A:p:H:t:i:adnDsv", &protocol, &protocol,
+				 &hw_type, &hw_type, &device);
+	argv += optind;
+	if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
+		ap = get_aftype(protocol);
+		if (ap == NULL)
+			bb_error_msg_and_die("%s: unknown %s", protocol, "address family");
+	}
+	if (option_mask32 & ARP_OPT_A || option_mask32 & ARP_OPT_p) {
+		hw = get_hwtype(hw_type);
+		if (hw == NULL)
+			bb_error_msg_and_die("%s: unknown %s", hw_type, "hardware type");
+		hw_set = 1;
+	}
+	//if (option_mask32 & ARP_OPT_i)... -i
+
+	if (ap->af != AF_INET) {
+		bb_error_msg_and_die("%s: kernel only supports 'inet'", ap->name);
+	}
+
+	/* If no hw type specified get default */
+	if (!hw) {
+		hw = get_hwtype(DFLT_HW);
+		if (!hw)
+			bb_error_msg_and_die("%s: %s not supported", DFLT_HW, "hardware type");
+	}
+
+	if (hw->alen <= 0) {
+		bb_error_msg_and_die("%s: %s without ARP support",
+							 hw->name, "hardware type");
+	}
+	sockfd = xsocket(AF_INET, SOCK_DGRAM, 0);
+
+	/* Now see what we have to do here... */
+	if (option_mask32 & (ARP_OPT_d|ARP_OPT_s)) {
+		if (argv[0] == NULL)
+			bb_error_msg_and_die("need host name");
+		if (option_mask32 & ARP_OPT_s)
+			return arp_set(argv);
+		return arp_del(argv);
+	}
+	//if (option_mask32 & ARP_OPT_a) - default
+	return arp_show(argv[0]);
+}




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