udhcpc: reuse string constant; remove unneeded memset(0)
[oweals/busybox.git] / networking / ip.c
index 7a0f308f0caf5f3f43053954809e4d61c4a8dedf..fb2f5e2da65a88f1c1f2653913b3777aa7e28972 100644 (file)
@@ -1,18 +1,87 @@
 /* vi: set sw=4 ts=4: */
 /*
- * ip.c                "ip" utility frontend.
- *
- * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
- *
- * Authors:    Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
+ * Licensed under GPLv2 or later, see file LICENSE in this source tree.
  *
+ * Authors: Alexey Kuznetsov, <kuznet@ms2.inr.ac.ru>
  *
  * Changes:
- *
- * Rani Assaf <rani@magic.metawire.com> 980929:        resolve addresses
+ * Rani Assaf <rani@magic.metawire.com> 980929: resolve addresses
  * Bernhard Reutner-Fischer rewrote to use index_in_substr_array
  */
 
+/* would need to make the " | " optional depending on more than one selected: */
+//usage:#define ip_trivial_usage
+//usage:       "[OPTIONS] {"
+//usage:       IF_FEATURE_IP_ADDRESS("address | ")
+//usage:       IF_FEATURE_IP_ROUTE("route | ")
+//usage:       IF_FEATURE_IP_LINK("link | ")
+//usage:       IF_FEATURE_IP_TUNNEL("tunnel | ")
+//usage:       IF_FEATURE_IP_RULE("rule")
+//usage:       "} {COMMAND}"
+//usage:#define ip_full_usage "\n\n"
+//usage:       "ip [OPTIONS] OBJECT {COMMAND}\n"
+//usage:       "where OBJECT := {"
+//usage:       IF_FEATURE_IP_ADDRESS("address | ")
+//usage:       IF_FEATURE_IP_ROUTE("route | ")
+//usage:       IF_FEATURE_IP_LINK("link | ")
+//usage:       IF_FEATURE_IP_TUNNEL("tunnel | ")
+//usage:       IF_FEATURE_IP_RULE("rule")
+//usage:       "}\n"
+//usage:       "OPTIONS := { -f[amily] { inet | inet6 | link } | -o[neline] }"
+//usage:
+//usage:#define ipaddr_trivial_usage
+//usage:       "{ {add|del} IFADDR dev STRING | {show|flush}\n"
+//usage:       "               [dev STRING] [to PREFIX] }"
+//usage:#define ipaddr_full_usage "\n\n"
+//usage:       "ipaddr {add|delete} IFADDR dev STRING\n"
+//usage:       "ipaddr {show|flush} [dev STRING] [scope SCOPE-ID]\n"
+//usage:       "       [to PREFIX] [label PATTERN]\n"
+//usage:       "       IFADDR := PREFIX | ADDR peer PREFIX\n"
+//usage:       "       [broadcast ADDR] [anycast ADDR]\n"
+//usage:       "       [label STRING] [scope SCOPE-ID]\n"
+//usage:       "       SCOPE-ID := [host | link | global | NUMBER]"
+//usage:
+//usage:#define iplink_trivial_usage
+//usage:       "{ set DEVICE { up | down | arp { on | off } | show [DEVICE] }"
+//usage:#define iplink_full_usage "\n\n"
+//usage:       "iplink set DEVICE { up | down | arp | multicast { on | off } |\n"
+//usage:       "                       dynamic { on | off } |\n"
+//usage:       "                       mtu MTU }\n"
+//usage:       "iplink show [DEVICE]"
+//usage:
+//usage:#define iproute_trivial_usage
+//usage:       "{ list | flush | { add | del | change | append |\n"
+//usage:       "               replace | monitor } ROUTE }"
+//usage:#define iproute_full_usage "\n\n"
+//usage:       "iproute { list | flush } SELECTOR\n"
+//usage:       "iproute get ADDRESS [from ADDRESS iif STRING]\n"
+//usage:       "                       [oif STRING] [tos TOS]\n"
+//usage:       "iproute { add | del | change | append | replace | monitor } ROUTE\n"
+//usage:       "                       SELECTOR := [root PREFIX] [match PREFIX] [proto RTPROTO]\n"
+//usage:       "                       ROUTE := [TYPE] PREFIX [tos TOS] [proto RTPROTO]\n"
+//usage:       "                               [metric METRIC]"
+//usage:
+//usage:#define iprule_trivial_usage
+//usage:       "{[list | add | del] RULE}"
+//usage:#define iprule_full_usage "\n\n"
+//usage:       "iprule [list | add | del] SELECTOR ACTION\n"
+//usage:       "       SELECTOR := [from PREFIX] [to PREFIX] [tos TOS] [fwmark FWMARK]\n"
+//usage:       "                       [dev STRING] [pref NUMBER]\n"
+//usage:       "       ACTION := [table TABLE_ID] [nat ADDRESS]\n"
+//usage:       "                       [prohibit | reject | unreachable]\n"
+//usage:       "                       [realms [SRCREALM/]DSTREALM]\n"
+//usage:       "       TABLE_ID := [local | main | default | NUMBER]"
+//usage:
+//usage:#define iptunnel_trivial_usage
+//usage:       "{ add | change | del | show } [NAME]\n"
+//usage:       "       [mode { ipip | gre | sit }]\n"
+//usage:       "       [remote ADDR] [local ADDR] [ttl TTL]"
+//usage:#define iptunnel_full_usage "\n\n"
+//usage:       "iptunnel { add | change | del | show } [NAME]\n"
+//usage:       "       [mode { ipip | gre | sit }] [remote ADDR] [local ADDR]\n"
+//usage:       "       [[i|o]seq] [[i|o]key KEY] [[i|o]csum]\n"
+//usage:       "       [ttl TTL] [tos TOS] [[no]pmtudisc] [dev PHYS_DEV]"
+
 #include "libbb.h"
 
 #include "libiproute/utils.h"
  || ENABLE_FEATURE_IP_TUNNEL \
  || ENABLE_FEATURE_IP_RULE
 
-static int NORETURN ip_print_help(char **argv UNUSED_PARAM)
+static int FAST_FUNC ip_print_help(char **argv UNUSED_PARAM)
 {
        bb_show_usage();
 }
 
-static int ip_do(int (*ip_func)(char **argv), char **argv)
+typedef int FAST_FUNC (*ip_func_ptr_t)(char**);
+
+static int ip_do(ip_func_ptr_t ip_func, char **argv)
 {
        argv = ip_parse_common_args(argv + 1);
        return ip_func(argv);
@@ -78,45 +149,29 @@ int ip_main(int argc UNUSED_PARAM, char **argv)
        static const char keywords[] ALIGN1 =
                IF_FEATURE_IP_ADDRESS("address\0")
                IF_FEATURE_IP_ROUTE("route\0")
+               IF_FEATURE_IP_ROUTE("r\0")
                IF_FEATURE_IP_LINK("link\0")
-               IF_FEATURE_IP_TUNNEL("tunnel\0" "tunl\0")
+               IF_FEATURE_IP_TUNNEL("tunnel\0")
+               IF_FEATURE_IP_TUNNEL("tunl\0")
                IF_FEATURE_IP_RULE("rule\0")
                ;
-       enum {
-               IF_FEATURE_IP_ADDRESS(IP_addr,)
-               IF_FEATURE_IP_ROUTE(IP_route,)
-               IF_FEATURE_IP_LINK(IP_link,)
-               IF_FEATURE_IP_TUNNEL(IP_tunnel, IP_tunl,)
-               IF_FEATURE_IP_RULE(IP_rule,)
-               IP_none
+       static const ip_func_ptr_t ip_func_ptrs[] = {
+               ip_print_help,
+               IF_FEATURE_IP_ADDRESS(do_ipaddr,)
+               IF_FEATURE_IP_ROUTE(do_iproute,)
+               IF_FEATURE_IP_ROUTE(do_iproute,)
+               IF_FEATURE_IP_LINK(do_iplink,)
+               IF_FEATURE_IP_TUNNEL(do_iptunnel,)
+               IF_FEATURE_IP_TUNNEL(do_iptunnel,)
+               IF_FEATURE_IP_RULE(do_iprule,)
        };
-       int (*ip_func)(char**) = ip_print_help;
+       ip_func_ptr_t ip_func;
+       int key;
 
        argv = ip_parse_common_args(argv + 1);
-       if (*argv) {
-               int key = index_in_substrings(keywords, *argv);
-               argv++;
-#if ENABLE_FEATURE_IP_ADDRESS
-               if (key == IP_addr)
-                       ip_func = do_ipaddr;
-#endif
-#if ENABLE_FEATURE_IP_ROUTE
-               if (key == IP_route)
-                       ip_func = do_iproute;
-#endif
-#if ENABLE_FEATURE_IP_LINK
-               if (key == IP_link)
-                       ip_func = do_iplink;
-#endif
-#if ENABLE_FEATURE_IP_TUNNEL
-               if (key == IP_tunnel || key == IP_tunl)
-                       ip_func = do_iptunnel;
-#endif
-#if ENABLE_FEATURE_IP_RULE
-               if (key == IP_rule)
-                       ip_func = do_iprule;
-#endif
-       }
+       key = *argv ? index_in_substrings(keywords, *argv++) : -1;
+       ip_func = ip_func_ptrs[key + 1];
+
        return ip_func(argv);
 }