This patch does probably too much, but it's hard (and very cumbersome/time consuming) to break it out. What is does is this: * each command has one short description, e.g. "list MUX configuration" * made sure the short descriptions start lowercase * each command has one usage. That string contains just the options, e.g. "[-npn]". It's not part of the long help text. * that is, it doesn't say "[OPTIONS]" anymore, every usable option is listed by character in this (short) option string (the long description is in the long help text, as before) * help texts have been reworked, to make them - sometimes smaller - sometimes describe the options better - more often present themselves in a nicer format * all long help texts are now created with BUSYBOX_CMD_HELP_ macros, no more 'static const __maybe_unused char cmd_foobar_help[]' * made sure the long help texts starts uppercase * because cmdtp->name and cmdtp->opts together provide the new usage, all "Usage: foobar" texts have been removed from the long help texts * BUSYBOX_CMD_HELP_TEXT() provides the trailing newline by itself, this is nicer in the source code * BUSYBOX_CMD_HELP_OPT() provides the trailing newline by itself * made sure no line gets longer than 77 characters * delibertely renamed cmdtp->usage, so that we can get compile-time errors (e.g. in out-of-tree modules that use register_command() * the 'help' command can now always emit the usage, even without compiled long help texts * 'help -v' gives a list of commands with their short description, this is similar like the old "help" command before my patchset * 'help -a' gives out help of all commands Signed-off-by: Holger Schurig <holgerschurig@gmail.com> Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>
124 lines
2.2 KiB
C
124 lines
2.2 KiB
C
#include <common.h>
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#include <command.h>
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#include <clock.h>
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#include <net.h>
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#include <errno.h>
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#include <linux/err.h>
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static uint16_t ping_sequence_number;
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static IPaddr_t net_ping_ip; /* the ip address to ping */
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#define PING_STATE_INIT 0
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#define PING_STATE_SUCCESS 1
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static int ping_state;
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static struct net_connection *ping_con;
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static int ping_send(void)
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{
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unsigned char *payload;
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struct icmphdr *icmp;
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uint64_t ts;
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icmp = ping_con->icmp;
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icmp->type = ICMP_ECHO_REQUEST;
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icmp->code = 0;
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icmp->checksum = 0;
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icmp->un.echo.id = 0;
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icmp->un.echo.sequence = htons(ping_sequence_number);
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ping_sequence_number++;
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payload = (char *)(icmp + 1);
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ts = get_time_ns();
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memcpy(payload, &ts, sizeof(ts));
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payload[8] = 0xab;
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payload[9] = 0xcd;
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return net_icmp_send(ping_con, 9);
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}
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static void ping_handler(void *ctx, char *pkt, unsigned len)
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{
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IPaddr_t tmp;
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struct iphdr *ip = net_eth_to_iphdr(pkt);
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tmp = net_read_ip((void *)&ip->saddr);
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if (tmp != net_ping_ip)
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return;
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ping_state = PING_STATE_SUCCESS;
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}
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static int do_ping(int argc, char *argv[])
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{
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int ret;
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uint64_t ping_start;
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unsigned retries = 0;
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if (argc < 2)
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return COMMAND_ERROR_USAGE;
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net_ping_ip = resolv(argv[1]);
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if (!net_ping_ip) {
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printf("unknown host %s\n", argv[1]);
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return 1;
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}
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ping_con = net_icmp_new(net_ping_ip, ping_handler, NULL);
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if (IS_ERR(ping_con)) {
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ret = PTR_ERR(ping_con);
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goto out;
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}
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ping_start = get_time_ns();
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ret = ping_send();
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if (ret)
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goto out_unreg;
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ping_state = PING_STATE_INIT;
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ping_sequence_number = 0;
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while (ping_state == PING_STATE_INIT) {
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if (ctrlc()) {
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ret = -EINTR;
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break;
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}
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net_poll();
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if (is_timeout(ping_start, SECOND)) {
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/* No answer, send another packet */
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ping_start = get_time_ns();
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ret = ping_send();
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if (ret)
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goto out_unreg;
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retries++;
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}
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if (retries > PKT_NUM_RETRIES) {
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ret = -ETIMEDOUT;
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goto out_unreg;
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}
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}
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if (!ret)
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printf("host %s is alive\n", argv[1]);
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out_unreg:
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net_unregister(ping_con);
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out:
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if (ret)
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printf("ping failed: %s\n", strerror(-ret));
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return ping_state == PING_STATE_SUCCESS ? 0 : 1;
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}
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BAREBOX_CMD_START(ping)
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.cmd = do_ping,
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BAREBOX_CMD_DESC("send ICMP echo requests")
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BAREBOX_CMD_OPTS("DESTINATION")
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BAREBOX_CMD_GROUP(CMD_GRP_NET)
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BAREBOX_CMD_END
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