add arp applet - thanks to

"Eric Spakman" <E.Spakman@inter.nl.net>

diff --git a/include/applets.h b/include/applets.h
index 8586ffc..465ecdb 100644 (file)
--- a/include/applets.h
+++ b/include/applets.h
@@ -56,6 +56,7 @@ USE_ADDGROUP(APPLET(addgroup, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_ADDUSER(APPLET(adduser, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_ADJTIMEX(APPLET(adjtimex, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_AR(APPLET(ar, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
+USE_ARP(APPLET(arp, _BB_DIR_SBIN, _BB_SUID_NEVER))
 USE_ARPING(APPLET(arping, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
 USE_ASH(APPLET_NOUSAGE(ash, ash, _BB_DIR_BIN, _BB_SUID_NEVER))
 USE_AWK(APPLET(awk, _BB_DIR_USR_BIN, _BB_SUID_NEVER))

diff --git a/include/libbb.h b/include/libbb.h
index e92e4db..6f66c85 100644 (file)
--- a/include/libbb.h
+++ b/include/libbb.h
@@ -121,6 +121,38 @@
 /* scary. better ideas? (but do *test* them first!) */
 #define OFF_T_MAX  ((off_t)~((off_t)1 << (sizeof(off_t)*8-1)))
 
+/* 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;
+};
+
 /* Some useful definitions */
 #undef FALSE
 #define FALSE   ((int) 0)
@@ -426,8 +458,13 @@ extern int bb_test(int argc, char** argv);
 int create_icmp_socket(void);
 int create_icmp6_socket(void);
 /* interface.c */
+struct aftype;
+struct hwtype;
 extern int interface_opt_a;
 int display_interfaces(char *ifname);
+struct aftype *get_aftype(const char *name);
+const struct hwtype *get_hwtype(const char *name);
+const struct hwtype *get_hwntype(int type);
 
 
 #ifndef BUILD_INDIVIDUAL

diff --git a/include/usage.h b/include/usage.h
index ae03d54..cfae4e1 100644 (file)
--- a/include/usage.h
+++ b/include/usage.h
@@ -55,6 +55,26 @@
        "       -x      Extract\n" \
        "       -v      Verbosely list files processed"
 
+#define arp_trivial_usage \
+       "\n" \
+       "[-vn]  [-H type] [-i if] -a [hostname]\n" \
+       "[-v]             [-i if] -d hostname [pub]\n" \
+       "[-v]   [-H type] [-i if] -s hostname hw_addr [temp]\n" \
+       "[-v]   [-H type] [-i if] -s hostname hw_addr [netmask nm] pub\n" \
+       "[-v]   [-H type] [-i if] -Ds hostname ifa [netmask nm] pub\n"
+#define arp_full_usage \
+       "Manipulate the system ARP cache" \
+       "\n\nOptions:" \
+       "\n     -a              Display (all) hosts" \
+       "\n     -s              Set a new ARP entry" \
+       "\n     -d              Delete a specified entry" \
+       "\n     -v              Verbose" \
+       "\n     -n              Don't resolve names" \
+       "\n     -i if           Specify network interface (e.g. eth0)" \
+       "\n     -D              Read <hwaddr> from given device" \
+       "\n     -A, -p          Specify protocol family" \
+       "\n     -H hwtype       Specify hardware address type"
+
 #define arping_trivial_usage \
        "[-fqbDUA] [-c count] [-w timeout] [-i device] [-s sender] target"
 #define arping_full_usage \

diff --git a/networking/Config.in b/networking/Config.in
index b2d973f..88ccb16 100644 (file)
--- a/networking/Config.in
+++ b/networking/Config.in
@@ -12,6 +12,12 @@ config FEATURE_IPV6
          Enable IPv6 support in busybox.
          This adds IPv6 support in the networking applets.
 
+config ARP
+       bool "arp"
+       default n
+       help
+         Manipulate the system ARP cache
+
 config ARPING
        bool "arping"
        default n

diff --git a/networking/Kbuild b/networking/Kbuild
index a9a51fc..4c29e45 100644 (file)
--- a/networking/Kbuild
+++ b/networking/Kbuild
@@ -5,6 +5,7 @@
 # Licensed under the GPL v2, see the file LICENSE in this tarball.
 
 lib-y:=
+lib-$(CONFIG_ARP)          += arp.o interface.o
 lib-$(CONFIG_ARPING)       += arping.o
 lib-$(CONFIG_DNSD)         += dnsd.o
 lib-$(CONFIG_ETHER_WAKE)   += ether-wake.o

diff --git a/networking/interface.c b/networking/interface.c
index b39298c..6d23e9b 100644 (file)
--- a/networking/interface.c
+++ b/networking/interface.c
@@ -91,26 +91,6 @@ struct in6_ifreq {
 #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;
-};
-
 /* Display an Internet socket address. */
 static char *INET_sprint(struct sockaddr *sap, int numeric)
 {
@@ -126,12 +106,66 @@ static char *INET_sprint(struct sockaddr *sap, int numeric)
        return buff;
 }
 
+static int INET_getsock(char *bufp, struct sockaddr *sap)
+{
+       char *sp = bufp, *bp;
+       unsigned int i;
+       unsigned val;
+       struct sockaddr_in *sock_in;
+
+       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(sock_in->sin_addr.s_addr); i++) {
+               *sp = toupper(*sp);
+
+               if ((unsigned)(*sp - 'A') <= 5)
+                       bp[i] |= (int) (*sp - ('A' - 10));
+               else if (isdigit(*sp))
+                       bp[i] |= (int) (*sp - '0');
+               else
+                       return -1;
+
+               bp[i] <<= 4;
+               sp++;
+               *sp = toupper(*sp);
+
+               if ((unsigned)(*sp - 'A') <= 5)
+                       bp[i] |= (int) (*sp - ('A' - 10));
+               else if (isdigit(*sp))
+                       bp[i] |= (int) (*sp - '0');
+               else
+                       return -1;
+
+               sp++;
+       }
+       sock_in->sin_addr.s_addr = htonl(val);
+
+       return (sp - bufp);
+}
+
+static int INET_input(int type, char *bufp, struct sockaddr *sap)
+{
+       switch (type) {
+       case 1:
+               return (INET_getsock(bufp, sap));
+       case 256:
+               return (INET_resolve(bufp, (struct sockaddr_in *) sap, 1));
+       default:
+               return (INET_resolve(bufp, (struct sockaddr_in *) sap, 0));
+       }
+}
+
 static struct aftype inet_aftype = {
        .name =         "inet",
        .title =        "DARPA Internet",
        .af =           AF_INET,
        .alen =         4,
        .sprint =       INET_sprint,
+       .input =        INET_input,
        .fd =           -1
 };
 
@@ -151,12 +185,37 @@ static char *INET6_sprint(struct sockaddr *sap, int numeric)
        return buff;
 }
 
+static int INET6_getsock(char *bufp, struct sockaddr *sap)
+{
+       struct sockaddr_in6 *sin6;
+
+       sin6 = (struct sockaddr_in6 *) sap;
+       sin6->sin6_family = AF_INET6;
+       sin6->sin6_port = 0;
+
+       if (inet_pton(AF_INET6, bufp, sin6->sin6_addr.s6_addr) <= 0)
+               return -1;
+
+       return 16;                      /* ?;) */
+}
+
+static int INET6_input(int type, char *bufp, struct sockaddr *sap)
+{
+       switch (type) {
+       case 1:
+               return (INET6_getsock(bufp, sap));
+       default:
+               return (INET6_resolve(bufp, (struct sockaddr_in6 *) sap));
+       }
+}
+
 static struct aftype inet6_aftype = {
        .name =         "inet6",
        .title =        "IPv6",
        .af =           AF_INET6,
        .alen =         sizeof(struct in6_addr),
        .sprint =       INET6_sprint,
+       .input =        INET6_input,
        .fd =           -1
 };
 
@@ -206,6 +265,20 @@ static struct aftype * const aftypes[] = {
 };
 
 /* Check our protocol family table for this family. */
+struct aftype *get_aftype(const char *name)
+{
+       struct aftype * const *afp;
+
+       afp = aftypes;
+       while (*afp != NULL) {
+               if (!strcmp((*afp)->name, name))
+                       return (*afp);
+               afp++;
+       }
+       return NULL;
+}
+
+/* Check our protocol family table for this family. */
 static struct aftype *get_afntype(int af)
 {
        struct aftype * const *afp;
@@ -714,18 +787,6 @@ static int do_if_fetch(struct interface *ife)
        return 0;
 }
 
-/* This structure defines hardware protocols and their handlers. */
-struct hwtype {
-       const char * const 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 const struct hwtype unspec_hwtype = {
        .name =         "unspec",
        .title =        "UNSPEC",
@@ -759,14 +820,69 @@ static char *pr_ether(unsigned char *ptr)
        return buff;
 }
 
-static const struct hwtype ether_hwtype = {
+static int in_ether(char *bufp, struct sockaddr *sap);
+
+static struct hwtype ether_hwtype = {
        .name =         "ether",
        .title =        "Ethernet",
        .type =         ARPHRD_ETHER,
        .alen =         ETH_ALEN,
-       .print =        pr_ether
+       .print =        pr_ether,
+       .input =        in_ether
 };
 
+static unsigned hexchar2int(char c)
+{
+       if (isdigit(c))
+               return c - '0';
+       c &= ~0x20; /* a -> A */
+       if ((unsigned)(c - 'A') <= 5)
+               return c - ('A' - 10);
+       return ~0U;
+}
+
+/* Input an Ethernet address and convert to binary. */
+static int in_ether(char *bufp, struct sockaddr *sap)
+{
+       unsigned char *ptr;
+       char c, *orig;
+       int i;
+       unsigned val;
+
+       sap->sa_family = ether_hwtype.type;
+       ptr = sap->sa_data;
+
+       i = 0;
+       orig = bufp;
+       while ((*bufp != '\0') && (i < ETH_ALEN)) {
+               val = hexchar2int(*bufp++) * 0x10;
+               if (val > 0xff) {
+                       errno = EINVAL;
+                       return -1;
+               }
+               c = *bufp;
+               if (c == ':' || c == 0)
+                       val >>= 4;
+               else {
+                       val |= hexchar2int(c);
+                       if (val > 0xff) {
+                               errno = EINVAL;
+                               return -1;
+                       }
+               }
+               if (c != 0)
+                       bufp++;
+               *ptr++ = (unsigned char) val;
+               i++;
+
+               /* We might get a semicolon here - not required. */
+               if (*bufp == ':') {
+                       bufp++;
+               }
+       }
+       return 0;
+}
+
 #include <net/if_arp.h>
 
 static const struct hwtype ppp_hwtype = {
@@ -811,7 +927,21 @@ static const char * const if_port_text[] = {
 #endif
 
 /* Check our hardware type table for this type. */
-static const struct hwtype *get_hwntype(int type)
+const struct hwtype *get_hwtype(const char *name)
+{
+       const struct hwtype * const *hwp;
+
+       hwp = hwtypes;
+       while (*hwp != NULL) {
+               if (!strcmp((*hwp)->name, name))
+                       return (*hwp);
+               hwp++;
+       }
+       return NULL;
+}
+
+/* Check our hardware type table for this type. */
+const struct hwtype *get_hwntype(int type)
 {
        const struct hwtype * const *hwp;