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/* * (C) Copyright 2004 * Wolfgang Denk, DENX Software Engineering, wd@denx.de. * * See file CREDITS for list of people who contributed to this * project. * * This program is free software; you can redistribute it and/or * modify it under the terms of the GNU General Public License as * published by the Free Software Foundation; either version 2 of * the License, or (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. * * You should have received a copy of the GNU General Public License * along with this program; if not, write to the Free Software * Foundation, Inc., 59 Temple Place, Suite 330, Boston, * MA 02111-1307 USA */ #include <common.h> #include <command.h> #include <stdio_dev.h> #include <net.h> DECLARE_GLOBAL_DATA_PTR; static char input_buffer[512]; static int input_size = 0; /* char count in input buffer */ static int input_offset = 0; /* offset to valid chars in input buffer */ static int input_recursion = 0; static int output_recursion = 0; static int net_timeout; static uchar nc_ether[6]; /* server enet address */ static IPaddr_t nc_ip; /* server ip */ static short nc_port; /* source/target port */ static const char *output_packet; /* used by first send udp */ static int output_packet_len = 0; static void nc_wait_arp_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len) { NetState = NETLOOP_SUCCESS; /* got arp reply - quit net loop */ } static void nc_handler(uchar *pkt, unsigned dest, IPaddr_t sip, unsigned src, unsigned len) { if (input_size) NetState = NETLOOP_SUCCESS; /* got input - quit net loop */ } static void nc_timeout (void) { NetState = NETLOOP_SUCCESS; } void NcStart (void) { if (!output_packet_len || memcmp (nc_ether, NetEtherNullAddr, 6)) { /* going to check for input packet */ NetSetHandler (nc_handler); NetSetTimeout (net_timeout, nc_timeout); } else { /* send arp request */ uchar *pkt; NetSetHandler (nc_wait_arp_handler); pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE; memcpy (pkt, output_packet, output_packet_len); NetSendUDPPacket (nc_ether, nc_ip, nc_port, nc_port, output_packet_len); } } int nc_input_packet (uchar * pkt, unsigned dest, unsigned src, unsigned len) { int end, chunk; if (dest != nc_port || !len) return 0; /* not for us */ if (input_size == sizeof input_buffer) return 1; /* no space */ if (len > sizeof input_buffer - input_size) len = sizeof input_buffer - input_size; end = input_offset + input_size; if (end > sizeof input_buffer) end -= sizeof input_buffer; chunk = len; if (end + len > sizeof input_buffer) { chunk = sizeof input_buffer - end; memcpy(input_buffer, pkt + chunk, len - chunk); } memcpy (input_buffer + end, pkt, chunk); input_size += len; return 1; } static void nc_send_packet (const char *buf, int len) { struct eth_device *eth; int inited = 0; uchar *pkt; uchar *ether; IPaddr_t ip; if ((eth = eth_get_dev ()) == NULL) { return; } if (!memcmp (nc_ether, NetEtherNullAddr, 6)) { if (eth->state == ETH_STATE_ACTIVE) return; /* inside net loop */ output_packet = buf; output_packet_len = len; NetLoop (NETCONS); /* wait for arp reply and send packet */ output_packet_len = 0; return; } if (eth->state != ETH_STATE_ACTIVE) { if (eth_init (gd->bd) < 0) return; inited = 1; } pkt = (uchar *) NetTxPacket + NetEthHdrSize () + IP_HDR_SIZE; memcpy (pkt, buf, len); ether = nc_ether; ip = nc_ip; NetSendUDPPacket (ether, ip, nc_port, nc_port, len); if (inited) eth_halt (); } static int nc_start(void) { int netmask, our_ip; nc_port = 6666; /* default port */ if (getenv ("ncip")) { char *p; nc_ip = getenv_IPaddr ("ncip"); if (!nc_ip) return -1; /* ncip is 0.0.0.0 */ if ((p = strchr (getenv ("ncip"), ':')) != NULL) nc_port = simple_strtoul (p + 1, NULL, 10); } else nc_ip = ~0; /* ncip is not set */ our_ip = getenv_IPaddr ("ipaddr"); netmask = getenv_IPaddr ("netmask"); if (nc_ip == ~0 || /* 255.255.255.255 */ ((netmask & our_ip) == (netmask & nc_ip) && /* on the same net */ (netmask | nc_ip) == ~0)) /* broadcast to our net */ memset (nc_ether, 0xff, sizeof nc_ether); else memset (nc_ether, 0, sizeof nc_ether); /* force arp request */ return 0; } static void nc_putc(char c) { if (output_recursion) return; output_recursion = 1; nc_send_packet (&c, 1); output_recursion = 0; } static void nc_puts(const char *s) { int len; if (output_recursion) return; output_recursion = 1; if ((len = strlen (s)) > 512) len = 512; nc_send_packet (s, len); output_recursion = 0; } static int nc_getc(void) { uchar c; input_recursion = 1; net_timeout = 0; /* no timeout */ while (!input_size) NetLoop (NETCONS); input_recursion = 0; c = input_buffer[input_offset++]; if (input_offset >= sizeof input_buffer) input_offset -= sizeof input_buffer; input_size--; return c; } static int nc_tstc(void) { struct eth_device *eth; if (input_recursion) return 0; if (input_size) return 1; eth = eth_get_dev (); if (eth && eth->state == ETH_STATE_ACTIVE) return 0; /* inside net loop */ input_recursion = 1; net_timeout = 1; NetLoop (NETCONS); /* kind of poll */ input_recursion = 0; return input_size != 0; } int drv_nc_init (void) { struct stdio_dev dev; int rc; memset (&dev, 0, sizeof (dev)); strcpy (dev.name, "nc"); dev.flags = DEV_FLAGS_OUTPUT | DEV_FLAGS_INPUT | DEV_FLAGS_SYSTEM; dev.start = nc_start; dev.putc = nc_putc; dev.puts = nc_puts; dev.getc = nc_getc; dev.tstc = nc_tstc; rc = stdio_register (&dev); return (rc == 0) ? 1 : rc; }


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