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List: busybox
Subject: [BusyBox] Adding arp to busybox
From: Paul van Gool <pvangool () mimotech ! com>
Date: 2004-01-27 2:47:16
Message-ID: 20040127024716.GA12331 () mimotech ! com
[Download RAW message or body]
Hi,
I recently had to use arp on an embedded system and noticed busybox does
not contain arp. So I added it. It's basically a port of the net-tools arp
to busybox.
This mail has two attachments:
- A diff against the current busybox code to add arp
- networking/arp.c
If it's usefull for anyone else, feel free to commit it to the busybox cvs
repository.
Thanks.
Paul
--
Paul van Gool Mimotech Software
pvangool@mimotech.com
["arp.diff" (text/plain)]
Index: include/applets.h
===================================================================
RCS file: /var/cvs/busybox/include/applets.h,v
retrieving revision 1.110
diff -p --unified=5 -t -w -r1.110 applets.h
--- include/applets.h 24 Dec 2003 06:02:10 -0000 1.110
+++ include/applets.h 27 Jan 2004 01:12:54 -0000
@@ -61,10 +61,13 @@
APPLET(adjtimex, adjtimex_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_AR
APPLET(ar, ar_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
+#ifdef CONFIG_ARP
+ APPLET(arp, arp_main, _BB_DIR_SBIN, _BB_SUID_NEVER)
+#endif
#ifdef CONFIG_ARPING
APPLET(arping, arping_main, _BB_DIR_USR_BIN, _BB_SUID_NEVER)
#endif
#ifdef CONFIG_ASH
APPLET_NOUSAGE("ash", ash_main, _BB_DIR_BIN, _BB_SUID_NEVER)
Index: include/libbb.h
===================================================================
RCS file: /var/cvs/busybox/include/libbb.h,v
retrieving revision 1.125
diff -p --unified=5 -t -w -r1.125 libbb.h
--- include/libbb.h 17 Jan 2004 05:03:30 -0000 1.125
+++ include/libbb.h 27 Jan 2004 01:12:55 -0000
@@ -482,6 +482,38 @@ extern void xregcomp(regex_t *preg, cons
#define HASH_SHA1 1
#define HASH_MD5 2
extern int hash_fd(int fd, const size_t size, const uint8_t hash_algo, uint8_t \
*hashval); extern size_t bb_full_fd_action(int src_fd, int dst_fd, const size_t \
size, ssize_t (*action)(int fd, const void *, size_t));
+/* This structure defines protocol families and their handlers. */
+struct aftype {
+ char *name;
+ char *title;
+ int af;
+ int alen;
+ char *(*print) (unsigned char *);
+ char *(*sprint) (struct sockaddr *, int numeric);
+ int (*input) (int type, char *bufp, struct sockaddr *);
+ void (*herror) (char *text);
+ int (*rprint) (int options);
+ int (*rinput) (int typ, int ext, char **argv);
+
+ /* may modify src */
+ int (*getmask) (char *src, struct sockaddr * mask, char *name);
+
+ int fd;
+ char *flag_file;
+};
+
+/* This structure defines hardware protocols and their handlers. */
+struct hwtype {
+ char *name;
+ char *title;
+ int type;
+ int alen;
+ char *(*print) (unsigned char *);
+ int (*input) (char *, struct sockaddr *);
+ int (*activate) (int fd);
+ int suppress_null_addr;
+};
+
#endif /* __LIBCONFIG_H__ */
Index: include/usage.h
===================================================================
RCS file: /var/cvs/busybox/include/usage.h,v
retrieving revision 1.186
diff -p --unified=5 -t -w -r1.186 usage.h
--- include/usage.h 15 Jan 2004 11:50:19 -0000 1.186
+++ include/usage.h 27 Jan 2004 01:12:58 -0000
@@ -40,10 +40,32 @@
"\t-p\t\textract to stdout\n" \
"\t-t\t\tlist\n" \
"\t-x\t\textract\n" \
"\t-v\t\tverbosely list files processed\n"
+#define arp_trivial_usage \
+ "[−evn] [−H type] [-i if] -a [hostname]\n" \
+ "\tarp [−v] [−i if] −d hostname [pub]\n" \
+ "\tarp [−v] [−H type] [−i if] -s hostname hw_addr [temp]\n" \
+ "\tarp [−v] [−H type] [−i if] -s hostname hw_addr [netmask nm] pub\n" \
\ + "\tarp [−v] [−H type] [−i if] -Ds hostname ifa [netmask nm] pub\n" \
+ "\tarp [−vnD] [−H type] [-i if] -f [filename]\n"
+#define arp_full_usage \
+ "Manipulate the system ARP cache.\n"
+ "Options:\n" \
+ "\t-a\t\tdisplay (all) hosts in alternative (BSD) style\n" \
+ "\t-e\t\tdisplay (all) hosts in default (Linux) style\n" \
+ "\t-s\t\tset a new ARP entry\n" \
+ "\t-d\t\tdelete a specified entry\n" \
+ "\t-v\t\tbe verbose\n" \
+ "\t-n\t\tdon't resolve names\n" \
+ "\t-i if\tspecify network interface (e.g. eth0)\n" \
+ "\t-D\t\tread <hwaddr> from given device\n" \
+ "\t-A, -p\t\tspecify protocol family\n" \
+ "\t-f\t\tread new entries from file or from /etc/ethers\n" \
+ "\t-H hwtype\tto specify hardware address type\n"
+
#define arping_trivial_usage \
"[-fqbDUA] [-c count] [-w timeout] [-I device] [-s sender] target\n"
#define arping_full_usage \
"Ping hosts by ARP requests/replies.\n\n" \
"Options:\n" \
Index: libbb/interface.c
===================================================================
RCS file: /var/cvs/busybox/libbb/interface.c,v
retrieving revision 1.20
diff -p --unified=5 -t -w -r1.20 interface.c
--- libbb/interface.c 29 Aug 2003 11:34:08 -0000 1.20
+++ libbb/interface.c 27 Jan 2004 01:13:00 -0000
@@ -133,30 +133,10 @@ struct in6_ifreq {
#ifndef IFF_DYNAMIC
#define IFF_DYNAMIC 0x8000 /* dialup device with changing addresses */
#endif
-/* This structure defines protocol families and their handlers. */
-struct aftype {
- const char *name;
- const char *title;
- int af;
- int alen;
- char *(*print) (unsigned char *);
- char *(*sprint) (struct sockaddr *, int numeric);
- int (*input) (int type, char *bufp, struct sockaddr *);
- void (*herror) (char *text);
- int (*rprint) (int options);
- int (*rinput) (int typ, int ext, char **argv);
-
- /* may modify src */
- int (*getmask) (char *src, struct sockaddr * mask, char *name);
-
- int fd;
- char *flag_file;
-};
-
#ifdef KEEP_UNUSED
static int flag_unx;
#ifdef HAVE_AFIPX
@@ -317,25 +297,26 @@ static char *INET_sprintmask(struct sock
if (INET_rresolve(buff, sizeof(buff), (struct sockaddr_in *) sap,
numeric, netmask) != 0)
return (NULL);
return (buff);
}
+#endif /* KEEP_UNUSED */
static int INET_getsock(char *bufp, struct sockaddr *sap)
{
char *sp = bufp, *bp;
unsigned int i;
unsigned val;
- struct sockaddr_in *sin;
+ struct sockaddr_in *sock_in;
- sin = (struct sockaddr_in *) sap;
- sin->sin_family = AF_INET;
- sin->sin_port = 0;
+ sock_in = (struct sockaddr_in *) sap;
+ sock_in->sin_family = AF_INET;
+ sock_in->sin_port = 0;
val = 0;
bp = (char *) &val;
- for (i = 0; i < sizeof(sin->sin_addr.s_addr); i++) {
+ for (i = 0; i < sizeof(sock_in->sin_addr.s_addr); i++) {
*sp = toupper(*sp);
if ((*sp >= 'A') && (*sp <= 'F'))
bp[i] |= (int) (*sp - 'A') + 10;
else if ((*sp >= '0') && (*sp <= '9'))
@@ -354,11 +335,11 @@ static int INET_getsock(char *bufp, stru
else
return (-1);
sp++;
}
- sin->sin_addr.s_addr = htonl(val);
+ sock_in->sin_addr.s_addr = htonl(val);
return (sp - bufp);
}
static int INET_input(int type, char *bufp, struct sockaddr *sap)
@@ -371,10 +352,11 @@ static int INET_input(int type, char *bu
default:
return (INET_resolve(bufp, (struct sockaddr_in *) sap, 0));
}
}
+#ifdef KEEP_UNUSED
static int INET_getnetmask(char *adr, struct sockaddr *m, char *name)
{
struct sockaddr_in *mask = (struct sockaddr_in *) m;
char *slash, *end;
int prefix;
@@ -397,11 +379,11 @@ static int INET_getnetmask(char *adr, st
#endif /* KEEP_UNUSED */
static struct aftype inet_aftype = {
"inet", "DARPA Internet", AF_INET, sizeof(unsigned long),
NULL /* UNUSED INET_print */ , INET_sprint,
- NULL /* UNUSED INET_input */ , NULL /* UNUSED INET_reserror */ ,
+ INET_input, NULL /* UNUSED INET_reserror */ ,
NULL /*INET_rprint */ , NULL /*INET_rinput */ ,
NULL /* UNUSED INET_getnetmask */ ,
-1,
NULL
};
@@ -438,11 +420,10 @@ static char *INET6_sprint(struct sockadd
(buff, sizeof(buff), (struct sockaddr_in6 *) sap, numeric) != 0)
return safe_strncpy(buff, _("[UNKNOWN]"), sizeof(buff));
return (buff);
}
-#ifdef KEEP_UNUSED
static int INET6_getsock(char *bufp, struct sockaddr *sap)
{
struct sockaddr_in6 *sin6;
sin6 = (struct sockaddr_in6 *) sap;
@@ -462,16 +443,15 @@ static int INET6_input(int type, char *b
return (INET6_getsock(bufp, sap));
default:
return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
}
}
-#endif /* KEEP_UNUSED */
static struct aftype inet6_aftype = {
"inet6", "IPv6", AF_INET6, sizeof(struct in6_addr),
NULL /* UNUSED INET6_print */ , INET6_sprint,
- NULL /* UNUSED INET6_input */ , NULL /* UNUSED INET6_reserror */ ,
+ INET6_input, NULL /* UNUSED INET6_reserror */ ,
NULL /*INET6_rprint */ , NULL /*INET6_rinput */ ,
NULL /* UNUSED INET6_getnetmask */ ,
-1,
NULL
};
@@ -668,13 +648,14 @@ static void aftrans_def(char *tool, char
if (aftrans_opt(buf))
strcpy(afname, buf);
free(buf);
}
+#endif
/* Check our protocol family table for this family. */
-static struct aftype *get_aftype(const char *name)
+struct aftype *get_aftype(const char *name)
{
struct aftype **afp;
#ifdef KEEP_UNUSED
if (!sVafinit)
@@ -689,11 +670,10 @@ static struct aftype *get_aftype(const c
}
if (strchr(name, ','))
bb_error_msg(_("Please don't supply more than one address \
family.")); return (NULL);
}
-#endif /* KEEP_UNUSED */
/* Check our protocol family table for this family. */
static struct aftype *get_afntype(int af)
{
struct aftype **afp;
@@ -1347,22 +1327,10 @@ static int do_if_fetch(struct interface
return -1;
}
return 0;
}
-/* This structure defines hardware protocols and their handlers. */
-struct hwtype {
- const char *name;
- const char *title;
- int type;
- int alen;
- char *(*print) (unsigned char *);
- int (*input) (char *, struct sockaddr *);
- int (*activate) (int fd);
- int suppress_null_addr;
-};
-
static struct hwtype unspec_hwtype = {
"unspec", "UNSPEC", -1, 0,
UNSPEC_print, NULL, NULL
};
@@ -1674,12 +1642,30 @@ static const char * const if_port_text[]
NULL
};
#endif
#endif
+struct hwtype *get_hwtype(const char *name)
+{
+ struct hwtype **hwp;
+
+#ifdef KEEP_UNUSED
+ if (!sVhwinit)
+ hwinit();
+#endif
+
+ hwp = hwtypes;
+ while (*hwp != NULL) {
+ if (!strcmp((*hwp)->name, name))
+ return (*hwp);
+ hwp++;
+ }
+ return (NULL);
+}
+
/* Check our hardware type table for this type. */
-static struct hwtype *get_hwntype(int type)
+struct hwtype *get_hwntype(int type)
{
struct hwtype **hwp;
#ifdef KEEP_UNUSED
if (!sVhwinit)
Index: networking/Config.in
===================================================================
RCS file: /var/cvs/busybox/networking/Config.in,v
retrieving revision 1.25
diff -p --unified=5 -t -w -r1.25 Config.in
--- networking/Config.in 22 Oct 2003 09:58:33 -0000 1.25
+++ networking/Config.in 27 Jan 2004 01:13:00 -0000
@@ -10,10 +10,16 @@ config CONFIG_FEATURE_IPV6
default n
help
Enable IPv6 support to busybox. This makes applets that talk IP
able to work with IPv6.
+config CONFIG_ARP
+ bool "arp"
+ default n
+ help
+ Manipulate the system ARP cache
+
config CONFIG_ARPING
bool "arping"
default n
help
Ping hosts by ARP packets
Index: networking/Makefile.in
===================================================================
RCS file: /var/cvs/busybox/networking/Makefile.in,v
retrieving revision 1.17
diff -p --unified=5 -t -w -r1.17 Makefile.in
--- networking/Makefile.in 28 Jul 2003 07:40:37 -0000 1.17
+++ networking/Makefile.in 27 Jan 2004 01:13:01 -0000
@@ -21,10 +21,11 @@ NETWORKING_AR:=networking.a
ifndef $(NETWORKING_DIR)
NETWORKING_DIR:=$(TOPDIR)networking/
endif
NETWORKING-y:=
+NETWORKING-$(CONFIG_ARP) += arp.o
NETWORKING-$(CONFIG_ARPING) += arping.o
NETWORKING-$(CONFIG_FTPGET) += ftpgetput.o
NETWORKING-$(CONFIG_FTPPUT) += ftpgetput.o
NETWORKING-$(CONFIG_HOSTNAME) += hostname.o
NETWORKING-$(CONFIG_HTTPD) += httpd.o
["arp.c" (text/plain)]
/*
* 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@uwalt.nl.mugnet.org>
* Busybox port: Paul van Gool <pvangool@mimotech.com>
*/
#include <sys/ioctl.h>
#include <sys/signal.h>
#include <sys/time.h>
#include <errno.h>
#include <netdb.h>
#include <stdlib.h>
#include <string.h>
#include <ctype.h>
#include <unistd.h>
#include <arpa/inet.h>
#include <net/if.h>
#include <net/if_arp.h>
#include <netinet/ether.h>
#include <netpacket/packet.h>
#include "busybox.h"
#include "inet_common.h"
#define APPLET_NAME "arp"
#define DFLT_AF "inet"
#define DFLT_HW "ether"
#define _PATH_PROCNET_ARP "/proc/net/arp"
extern struct aftype *get_aftype(const char *name);
extern struct hwtype *get_hwntype(int type);
extern struct hwtype *get_hwtype(const char *name);
int opt_n = 0; /* do not resolve addresses */
int opt_v = 0; /* debugging output flag */
int opt_D = 0; /* HW-address is devicename */
int opt_e = 0; /* 0=BSD output, 1=new linux */
int opt_a = 0; /* all entries, substring match */
struct aftype *ap; /* current address family */
struct hwtype *hw; /* current hardware type */
int sockfd = 0; /* active socket descriptor */
int hw_set = 0; /* flag if hw-type was set (-H) */
char device[16] = ""; /* current device */
/* Split the input string into multiple fields. */
int getargs(char *string, char *arguments[])
{
int len = strlen(string);
char temp[len+1];
char *sp, *ptr;
int i, argc;
char want;
/*
* Copy the string into a buffer. We may have to modify
* the original string because of all the quoting...
*/
sp = string;
i = 0;
strcpy(temp, string);
ptr = temp;
/*
* Look for delimiters ("); if present whatever
* they enclose will be considered one argument.
*/
while (*ptr != '\0' && i < 31) {
/* Ignore leading whitespace on input string. */
while (*ptr == ' ' || *ptr == '\t')
ptr++;
/* Set string pointer. */
arguments[i++] = sp;
/* Check for any delimiters. */
if (*ptr == '"' || *ptr == '\'') {
/*
* Copy the string up to any whitespace OR the next
* delimiter. If the delimiter was escaped, skip it
* as it if was not there.
*/
want = *ptr++;
while (*ptr != '\0') {
if (*ptr == want && *(ptr - 1) != '\\') {
ptr++;
break;
}
*sp++ = *ptr++;
}
} else {
/* Just copy the string up to any whitespace. */
while (*ptr != '\0' && *ptr != ' ' && *ptr != '\t')
*sp++ = *ptr++;
}
*sp++ = '\0';
/* Skip trailing whitespace. */
if (*ptr != '\0') {
while (*ptr == ' ' || *ptr == '\t')
ptr++;
}
}
argc = i;
while (i < 32)
arguments[i++] = (char *) NULL;
return (argc);
}
/* Delete an entry from the ARP cache. */
static int arp_del(char **args)
{
char host[128];
struct arpreq req;
struct sockaddr sa;
int flags = 0;
int err;
memset((char *) &req, 0, sizeof(req));
/* Resolve the host name. */
if (*args == NULL) {
bb_error_msg("need host name\n");
return -1;
}
safe_strncpy(host, *args, (sizeof host));
if (ap->input(0, host, &sa) < 0) {
bb_herror_msg("%s", host);
return -1;
}
/* If a host has more than one address, use the correct one! */
memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr));
if (hw_set)
req.arp_ha.sa_family = hw->type;
req.arp_flags = ATF_PERM;
args++;
while (*args != NULL) {
if (opt_v)
bb_error_msg("args=%s\n", *args);
if (!strcmp(*args, "pub")) {
flags |= 1;
args++;
continue;
}
if (!strcmp(*args, "priv")) {
flags |= 2;
args++;
continue;
}
if (!strcmp(*args, "temp")) {
req.arp_flags &= ~ATF_PERM;
args++;
continue;
}
if (!strcmp(*args, "trail")) {
req.arp_flags |= ATF_USETRAILERS;
args++;
continue;
}
if (!strcmp(*args, "dontpub")) {
#ifdef HAVE_ATF_DONTPUB
req.arp_flags |= ATF_DONTPUB;
#else
bb_error_msg("feature ATF_DONTPUB is not supported");
#endif
args++;
continue;
}
if (!strcmp(*args, "auto")) {
#ifdef HAVE_ATF_MAGIC
req.arp_flags |= ATF_MAGIC;
#else
bb_error_msg("feature ATF_MAGIC is not supported");
#endif
args++;
continue;
}
if (!strcmp(*args, "dev")) {
if (*++args == NULL)
bb_show_usage();
safe_strncpy(device, *args, sizeof(device));
args++;
continue;
}
if (!strcmp(*args, "netmask")) {
if (*++args == NULL)
bb_show_usage();
if (strcmp(*args, "255.255.255.255") != 0) {
strcpy(host, *args);
if (ap->input(0, host, &sa) < 0) {
bb_herror_msg("%s", host);
return (-1);
}
memcpy((char *) &req.arp_netmask, (char *) &sa,
sizeof(struct sockaddr));
req.arp_flags |= ATF_NETMASK;
}
args++;
continue;
}
bb_show_usage();
}
if (flags == 0)
flags = 3;
strcpy(req.arp_dev, device);
err = -1;
/* Call the kernel. */
if (flags & 2) {
if (opt_v)
bb_error_msg("SIOCDARP(nopub)\n");
if ((err = ioctl(sockfd, SIOCDARP, &req) < 0)) {
if (errno == ENXIO) {
if (flags & 1)
goto nopub;
printf("No ARP entry for %s\n", host);
return -1;
}
perror("SIOCDARP(priv)");
return -1;
}
}
if ((flags & 1) && (err)) {
nopub:
req.arp_flags |= ATF_PUBL;
if (opt_v)
bb_error_msg("SIOCDARP(pub)\n");
if (ioctl(sockfd, SIOCDARP, &req) < 0) {
if (errno == ENXIO) {
printf("No ARP entry for %s\n", host);
return -1;
}
perror("SIOCDARP(pub)");
return -1;
}
}
return 0;
}
/* Get the hardware address to a specified interface name */
static int arp_getdevhw(char *ifname, struct sockaddr *sa, struct hwtype *hwt)
{
struct ifreq ifr;
struct hwtype *xhw;
strcpy(ifr.ifr_name, ifname);
if (ioctl(sockfd, SIOCGIFHWADDR, &ifr) < 0) {
bb_error_msg("cant get HW-Address for `%s': %s.\n",
ifname, strerror(errno));
return -1;
}
if (hwt && (ifr.ifr_hwaddr.sa_family != hw->type)) {
bb_error_msg("protocol type mismatch.\n");
return -1;
}
memcpy((char *) sa, (char *) &(ifr.ifr_hwaddr), sizeof(struct sockaddr));
if (opt_v) {
if (!(xhw = get_hwntype(ifr.ifr_hwaddr.sa_family)) ||
(xhw->print == 0))
{
xhw = get_hwntype(-1);
}
bb_error_msg("device `%s' has HW address %s `%s'.\n",
ifname, xhw->name, xhw->print((char *)&ifr.ifr_hwaddr.sa_data));
}
return 0;
}
/* Set an entry in the ARP cache. */
static int arp_set(char **args)
{
char host[128];
struct arpreq req;
struct sockaddr sa;
int flags;
memset((char *) &req, 0, sizeof(req));
/* Resolve the host name. */
if (*args == NULL) {
bb_error_msg("need host name\n");
return -1;
}
safe_strncpy(host, *args++, (sizeof host));
if (ap->input(0, host, &sa) < 0) {
bb_herror_msg("%s", host);
return -1;
}
/* If a host has more than one address, use the correct one! */
memcpy((char *) &req.arp_pa, (char *) &sa, sizeof(struct sockaddr));
/* Fetch the hardware address. */
if (*args == NULL) {
bb_error_msg("need hardware address\n");
return -1;
}
if (opt_D) {
if (arp_getdevhw(*args++, &req.arp_ha, hw_set ? hw : NULL) < 0)
return (-1);
} else {
if (hw->input(*args++, &req.arp_ha) < 0) {
bb_error_msg("invalid hardware address\n");
return -1;
}
}
/* Check out any modifiers. */
flags = ATF_PERM | ATF_COM;
while (*args != NULL) {
if (!strcmp(*args, "temp")) {
flags &= ~ATF_PERM;
args++;
continue;
}
if (!strcmp(*args, "pub")) {
flags |= ATF_PUBL;
args++;
continue;
}
if (!strcmp(*args, "priv")) {
flags &= ~ATF_PUBL;
args++;
continue;
}
if (!strcmp(*args, "trail")) {
flags |= ATF_USETRAILERS;
args++;
continue;
}
if (!strcmp(*args, "dontpub")) {
#ifdef HAVE_ATF_DONTPUB
flags |= ATF_DONTPUB;
#else
bb_error_msg("feature ATF_DONTPUB is not supported");
#endif
args++;
continue;
}
if (!strcmp(*args, "auto")) {
#ifdef HAVE_ATF_MAGIC
flags |= ATF_MAGIC;
#else
bb_error_msg("feature ATF_MAGIC is not supported");
#endif
args++;
continue;
}
if (!strcmp(*args, "dev")) {
if (*++args == NULL)
bb_show_usage();
safe_strncpy(device, *args, sizeof(device));
args++;
continue;
}
if (!strcmp(*args, "netmask")) {
if (*++args == NULL)
bb_show_usage();
if (strcmp(*args, "255.255.255.255") != 0) {
strcpy(host, *args);
if (ap->input(0, host, &sa) < 0) {
bb_herror_msg("%s", host);
return (-1);
}
memcpy((char *) &req.arp_netmask, (char *) &sa,
sizeof(struct sockaddr));
flags |= ATF_NETMASK;
}
args++;
continue;
}
bb_show_usage();
}
/* Fill in the remainder of the request. */
req.arp_flags = flags;
strcpy(req.arp_dev, device);
/* Call the kernel. */
if (opt_v)
bb_error_msg("SIOCSARP()\n");
if (ioctl(sockfd, SIOCSARP, &req) < 0) {
perror("SIOCSARP");
return -1;
}
return 0;
}
/* Process an EtherFile */
static int arp_file(char *name)
{
char buff[1024];
char *sp, *args[32];
int linenr, argc;
FILE *fp;
if ((fp = fopen(name, "r")) == NULL) {
bb_error_msg("cannot open etherfile %s!\n", name);
return -1;
}
/* Read the lines in the file. */
linenr = 0;
while (fgets(buff, sizeof(buff), fp) != (char *) NULL) {
linenr++;
if (opt_v == 1)
fprintf(stderr, ">> %s", buff);
if ((sp = strchr(buff, '\n')) != (char *) NULL)
*sp = '\0';
if (buff[0] == '#' || buff[0] == '\0')
continue;
argc = getargs(buff, args);
if (argc < 2) {
bb_error_msg("format error on line %u of etherfile %s!\n",
linenr, name);
continue;
}
if (strchr (args[0], ':') != NULL) {
/* We have a correct ethers file, switch hw adress and hostname
for arp */
char *cp;
cp = args[1];
args[1] = args[0];
args[0] = cp;
}
if (arp_set(args) != 0)
bb_error_msg("cannot set entry on line %u of etherfile %s!\n",
linenr, name);
}
(void) fclose(fp);
return 0;
}
/* Print the contents of an ARP request block. */
static void arp_disp_2(char *name, int type, int arp_flags, char *hwa,
char *mask, char *dev)
{
static int title = 0;
struct hwtype *xhw;
char flags[10];
xhw = get_hwntype(type);
if (xhw == NULL)
xhw = get_hwtype(DFLT_HW);
if (title++ == 0) {
printf("Address HWtype HWaddress Flags Mask Iface\n");
}
/* Setup the flags. */
flags[0] = '\0';
if (arp_flags & ATF_COM)
strcat(flags, "C");
if (arp_flags & ATF_PERM)
strcat(flags, "M");
if (arp_flags & ATF_PUBL)
strcat(flags, "P");
#ifdef HAVE_ATF_MAGIC
if (arp_flags & ATF_MAGIC)
strcat(flags, "A");
#endif
#ifdef HAVE_ATF_DONTPUB
if (arp_flags & ATF_DONTPUB)
strcat(flags, "!");
#endif
if (arp_flags & ATF_USETRAILERS)
strcat(flags, "T");
if (!(arp_flags & ATF_NETMASK))
mask = "";
printf("%-23.23s ", name);
if (!(arp_flags & ATF_COM)) {
if (arp_flags & ATF_PUBL)
printf("%-8.8s%-20.20s", "*", "*");
else
printf("%-8.8s%-20.20s", "", "(incomplete)");
} else {
printf("%-8.8s%-20.20s", xhw->name, hwa);
}
printf("%-6.6s%-15.15s %s\n", flags, mask, dev);
}
/* 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)
{
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. */
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, showed = 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("%s", host);
return -1;
}
safe_strncpy(host, ap->sprint(&sa, 1), sizeof(host));
}
/* Open the PROCps kernel table. */
if ((fp = fopen(_PATH_PROCNET_ARP, "r")) == NULL) {
perror(_PATH_PROCNET_ARP);
return -1;
}
/* Bypass header -- read until newline */
if (fgets(line, sizeof(line), fp) != (char *) NULL) {
strcpy(mask, "-");
strcpy(dev, "-");
/* 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))
continue;
/* if the user specified device differs, skip it */
if (device[0] && strcmp(dev, device))
continue;
showed++;
/* This IS ugly but it works -be */
if (opt_n)
hostname = "?";
else {
if (ap->input(0, ip, &sa) < 0)
hostname = ip;
else
hostname = ap->sprint(&sa, opt_n | 0x8000);
if (strcmp(hostname, ip) == 0)
hostname = "?";
}
if (opt_e)
arp_disp_2(hostname[0] == '?' ? ip : hostname, type, flags,
hwa, mask, dev);
else
arp_disp(hostname, ip, type, flags, hwa, mask, dev);
}
}
if (opt_v)
printf("Entries: %d\tSkipped: %d\tFound: %d\n",
entries, entries - showed, showed);
if (!showed) {
if (host[0] && !opt_a)
printf("%s (%s) -- no entry\n", name, host);
else if (hw_set || host[0] || device[0]) {
printf("in %d entries no match found.\n", entries);
}
}
(void) fclose(fp);
return 0;
}
int arp_main(int argc, char **argv)
{
int what, i;
/* Initialize variables... */
if ((hw = get_hwtype(DFLT_HW)) == NULL) {
bb_error_msg("%s: hardware type not supported!\n", DFLT_HW);
return -1;
}
if ((ap = get_aftype(DFLT_AF)) == NULL) {
bb_error_msg("%s: address family not supported!\n", DFLT_AF);
return -1;
}
what = 0;
/* Fetch the command-line arguments. */
while ((i = getopt(argc, argv, "A:H:adfp:nsei:t:vh?DNV")) != EOF)
switch (i) {
case 'a':
what = 1;
opt_a = 1;
break;
case 'f':
what = 2;
break;
case 'd':
what = 3;
break;
case 's':
what = 4;
break;
case 'e':
opt_e = 1;
break;
case 'n':
opt_n = 1;
break;
case 'D':
opt_D = 1;
break;
case 'v':
opt_v = 1;
break;
case 'A':
case 'p':
ap = get_aftype(optarg);
if (ap == NULL) {
bb_error_msg("%s: unknown address family.\n", optarg);
exit(-1);
}
break;
case 'H':
case 't':
hw = get_hwtype(optarg);
if (hw == NULL) {
bb_error_msg("%s: unknown hardware type.\n", optarg);
exit(-1);
}
hw_set = 1;
break;
case 'i':
safe_strncpy(device, optarg, sizeof(device));
break;
case '?':
case 'h':
default:
bb_show_usage();
}
if (ap->af != AF_INET) {
bb_error_msg("%s: kernel only supports 'inet'.\n", ap->name);
exit(-1);
}
/* If not hw type specified get default */
if (hw_set==0) {
if ((hw = get_hwtype(DFLT_HW)) == NULL) {
bb_error_msg("%s: hardware type not supported!\n", DFLT_HW);
return (-1);
}
}
if (hw->alen <= 0) {
bb_error_msg("%s: hardware type without ARP support.\n", hw->name);
exit(-1);
}
if ((sockfd = socket(AF_INET, SOCK_DGRAM, 0)) < 0) {
perror("socket");
return -1;
}
/* Now see what we have to do here... */
switch (what) {
case 0:
opt_e = 1;
what = arp_show(argv[optind]);
break;
case 1: /* show an ARP entry in the cache */
what = arp_show(argv[optind]);
break;
case 2: /* process an EtherFile */
what = arp_file(argv[optind] ? argv[optind] : "/etc/ethers");
break;
case 3: /* delete an ARP entry from the cache */
what = arp_del(&argv[optind]);
break;
case 4: /* set an ARP entry in the cache */
what = arp_set(&argv[optind]);
break;
default:
bb_show_usage();
}
return what;
}
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