Function netdump_start

freebsd/netinet/netdump/netdump_client.c:284–337

* Perform any initialization needed prior to transmitting the kernel core. */

 * Perform any initialization needed prior to transmitting the kernel core.
 */
static int
netdump_start(struct dumperinfo *di)
{
	struct debugnet_conn_params dcp;
	struct debugnet_pcb *pcb;
	char buf[INET_ADDRSTRLEN];
	int error;

	error = 0;

	/* Check if the dumping is allowed to continue. */
	if (!netdump_enabled())
		return (EINVAL);

	if (!KERNEL_PANICKED()) {
		printf(
		    "netdump_start: netdump may only be used after a panic\n");
		return (EINVAL);
	}

	memset(&dcp, 0, sizeof(dcp));

	if (nd_server.s_addr == INADDR_ANY) {
		printf("netdump_start: can't netdump; no server IP given\n");
		return (EINVAL);
	}

	/* We start dumping at offset 0. */
	di->dumpoff = 0;

	dcp.dc_ifp = nd_ifp;

	dcp.dc_client = nd_client.s_addr;
	dcp.dc_server = nd_server.s_addr;
	dcp.dc_gateway = nd_gateway.s_addr;

	dcp.dc_herald_port = NETDUMP_PORT;
	dcp.dc_client_port = NETDUMP_ACKPORT;

	dcp.dc_herald_data = nd_path;
	dcp.dc_herald_datalen = (nd_path[0] == 0) ? 0 : strlen(nd_path) + 1;

	error = debugnet_connect(&dcp, &pcb);
	if (error != 0) {
		printf("failed to contact netdump server\n");
		/* Squash debugnet to something the dumper code understands. */
		return (EINVAL);
	}

	printf("netdumping to %s (%6D)\n", inet_ntoa_r(nd_server, buf),
	    debugnet_get_gw_mac(pcb), ":");
	nd_conf.nd_pcb = pcb;
	return (0);
}

static int
netdump_write_headers(struct dumperinfo *di, struct kerneldumpheader *kdh,