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ether-wake: shorten help text, reduce packet buffer size

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function                                             old     new   delta
ether_wake_main                                      726     727      +1
packed_usage                                       29468   29434     -34

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2013-10-14 19:04:20 +02:00
parent d074b416f8
commit eba5faec67
1 changed files with 10 additions and 9 deletions
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19
networking/ether-wake.c
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@ -62,17 +62,17 @@
* An alternative to needing 'root' is using a UDP broadcast socket, however * An alternative to needing 'root' is using a UDP broadcast socket, however
* doing so only works with adapters configured for unicast+broadcast Rx * doing so only works with adapters configured for unicast+broadcast Rx
* filter. That configuration consumes more power. * filter. That configuration consumes more power.
*/ */
//usage:#define ether_wake_trivial_usage //usage:#define ether_wake_trivial_usage
//usage: "[-b] [-i iface] [-p aa:bb:cc:dd[:ee:ff]] MAC" //usage: "[-b] [-i IFACE] [-p aa:bb:cc:dd[:ee:ff]/a.b.c.d] MAC"
//usage:#define ether_wake_full_usage "\n\n" //usage:#define ether_wake_full_usage "\n\n"
//usage: "Send a magic packet to wake up sleeping machines.\n" //usage: "Send a magic packet to wake up sleeping machines.\n"
//usage: "MAC must be a station address (00:11:22:33:44:55) or\n" //usage: "MAC must be a station address (00:11:22:33:44:55) or\n"
//usage: "a hostname with a known 'ethers' entry.\n" //usage: "a hostname with a known 'ethers' entry.\n"
//usage: "\n -b Send wake-up packet to the broadcast address" //usage: "\n -b Broadcast the packet"
//usage: "\n -i iface Interface to use (default eth0)" //usage: "\n -i IFACE Interface to use (default eth0)"
//usage: "\n -p pass Append four or six byte password PW to the packet" //usage: "\n -p PASSWORD Append four or six byte PASSWORD to the packet"
#include "libbb.h" #include "libbb.h"
#include <netpacket/packet.h> #include <netpacket/packet.h>
@ -130,7 +130,8 @@ static void get_dest_addr(const char *hostid, struct ether_addr *eaddr)
} }
} }
static int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast) #define PKT_HEADER_SIZE (20 + 16*6)
static int fill_pkt_header(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
{ {
int i; int i;
unsigned char *station_addr = eaddr->ether_addr_octet; unsigned char *station_addr = eaddr->ether_addr_octet;
@ -153,7 +154,7 @@ static int get_fill(unsigned char *pkt, struct ether_addr *eaddr, int broadcast)
memcpy(pkt, station_addr, 6); /* 20,26,32,... */ memcpy(pkt, station_addr, 6); /* 20,26,32,... */
} }
return 20 + 16*6; /* length of packet */ return PKT_HEADER_SIZE; /* length of packet */
} }
static int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd) static int get_wol_pw(const char *ethoptarg, unsigned char *wol_passwd)
@ -195,7 +196,7 @@ int ether_wake_main(int argc UNUSED_PARAM, char **argv)
int wol_passwd_sz = 0; int wol_passwd_sz = 0;
int s; /* Raw socket */ int s; /* Raw socket */
int pktsize; int pktsize;
unsigned char outpack[1000]; unsigned char outpack[PKT_HEADER_SIZE + 6 /* max passwd size */ + 16 /* paranoia */];
struct ether_addr eaddr; struct ether_addr eaddr;
struct whereto_t whereto; /* who to wake up */ struct whereto_t whereto; /* who to wake up */
@ -217,7 +218,7 @@ int ether_wake_main(int argc UNUSED_PARAM, char **argv)
get_dest_addr(argv[optind], &eaddr); get_dest_addr(argv[optind], &eaddr);
/* fill out the header of the packet */ /* fill out the header of the packet */
pktsize = get_fill(outpack, &eaddr, flags /* & 1 OPT_BROADCAST */); pktsize = fill_pkt_header(outpack, &eaddr, flags /* & 1 OPT_BROADCAST */);
bb_debug_dump_packet(outpack, pktsize); bb_debug_dump_packet(outpack, pktsize);