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[/] [openrisc/] [trunk/] [rtos/] [ecos-2.0/] [packages/] [redboot/] [v2_0/] [src/] [net/] [bootp.c] - Rev 256
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//========================================================================== // // net/bootp.c // // Stand-alone minimal BOOTP support for RedBoot // //========================================================================== //####ECOSGPLCOPYRIGHTBEGIN#### // ------------------------------------------- // This file is part of eCos, the Embedded Configurable Operating System. // Copyright (C) 1998, 1999, 2000, 2001, 2002 Red Hat, Inc. // Copyright (C) 2002 Gary Thomas // // eCos 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 or (at your option) any later version. // // eCos 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 eCos; if not, write to the Free Software Foundation, Inc., // 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. // // As a special exception, if other files instantiate templates or use macros // or inline functions from this file, or you compile this file and link it // with other works to produce a work based on this file, this file does not // by itself cause the resulting work to be covered by the GNU General Public // License. However the source code for this file must still be made available // in accordance with section (3) of the GNU General Public License. // // This exception does not invalidate any other reasons why a work based on // this file might be covered by the GNU General Public License. // // Alternative licenses for eCos may be arranged by contacting Red Hat, Inc. // at http://sources.redhat.com/ecos/ecos-license/ // ------------------------------------------- //####ECOSGPLCOPYRIGHTEND#### //========================================================================== //#####DESCRIPTIONBEGIN#### // // Author(s): gthomas // Contributors: gthomas // Date: 2000-07-14 // Purpose: // Description: // // This code is part of RedBoot (tm). // //####DESCRIPTIONEND#### // //========================================================================== #include <redboot.h> #include <net/net.h> #include <net/bootp.h> extern int net_debug; #define SHOULD_BE_RANDOM 0x12345555 /* How many milliseconds to wait before retrying the request */ #define RETRY_TIME 1000 #define MAX_RETRIES 30 static bootp_header_t *bp_info; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY static const unsigned char dhcpCookie[] = {99,130,83,99}; static const unsigned char dhcpEndOption[] = {255}; static const unsigned char dhcpRequestOption[] = {52,1,3}; #endif static void bootp_handler(udp_socket_t *skt, char *buf, int len, ip_route_t *src_route, word src_port) { bootp_header_t *b; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY unsigned char *p,*end; int optlen; #endif b = (bootp_header_t *)buf; if (bp_info) { memset(bp_info,0,sizeof *bp_info); if (len > sizeof *bp_info) len = sizeof *bp_info; memcpy(bp_info, b, len); } // Only accept pure REPLY responses if (b->bp_op != BOOTREPLY) return; // Must be sent to me, as well! if (memcmp(b->bp_chaddr, __local_enet_addr, 6)) return; memcpy(__local_ip_addr, &b->bp_yiaddr, 4); #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY memcpy(__local_ip_gate, &b->bp_giaddr, 4); if (memcmp(b->bp_vend, dhcpCookie, sizeof(dhcpCookie))) return; optlen = len - (b->bp_vend - ((unsigned char*)b)); p = b->bp_vend+4; end = ((unsigned char*)b) + len; while (p < end) { unsigned char tag = *p; if (tag == TAG_END) break; if (tag == TAG_PAD) optlen = 1; else { optlen = p[1]; p += 2; switch (tag) { case TAG_SUBNET_MASK: // subnet mask memcpy(__local_ip_mask,p,4); break; case TAG_GATEWAY: // router memcpy(__local_ip_gate,p,4); break; default: break; } } p += optlen; } #endif } #define AddOption(p,d) do {memcpy(p,d,sizeof d); p += sizeof d;} while (0) /* * Find our IP address and copy to __local_ip_addr. * Return zero if successful, -1 if not. */ int __bootp_find_local_ip(bootp_header_t *info) { udp_socket_t udp_skt; bootp_header_t b; ip_route_t r; int retry; unsigned long start; ip_addr_t saved_ip_addr; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY unsigned char *p; #endif int txSize; bp_info = info; memset(&b, 0, sizeof(b)); b.bp_op = BOOTREQUEST; b.bp_htype = HTYPE_ETHERNET; b.bp_hlen = 6; b.bp_xid = SHOULD_BE_RANDOM; #ifdef CYGSEM_REDBOOT_NETWORKING_USE_GATEWAY p = b.bp_vend; AddOption(p,dhcpCookie); AddOption(p,dhcpRequestOption); AddOption(p,dhcpEndOption); // Some servers insist on a minimum amount of "vendor" data if (p < &b.bp_vend[BP_MIN_VEND_SIZE]) p = &b.bp_vend[BP_MIN_VEND_SIZE]; txSize = p - (unsigned char*)&b; #else txSize = sizeof(b); #endif memcpy( saved_ip_addr, __local_ip_addr, sizeof(__local_ip_addr) ); memset( __local_ip_addr, 0, sizeof(__local_ip_addr) ); memcpy(b.bp_chaddr, __local_enet_addr, 6); /* fill out route for a broadcast */ r.ip_addr[0] = 255; r.ip_addr[1] = 255; r.ip_addr[2] = 255; r.ip_addr[3] = 255; r.enet_addr[0] = 255; r.enet_addr[1] = 255; r.enet_addr[2] = 255; r.enet_addr[3] = 255; r.enet_addr[4] = 255; r.enet_addr[5] = 255; /* setup a socket listener for bootp replies */ __udp_install_listener(&udp_skt, IPPORT_BOOTPC, bootp_handler); retry = MAX_RETRIES; while (retry-- > 0) { start = MS_TICKS(); __udp_send((char *)&b, txSize, &r, IPPORT_BOOTPS, IPPORT_BOOTPC); do { __enet_poll(); if (__local_ip_addr[0] || __local_ip_addr[1] || __local_ip_addr[2] || __local_ip_addr[3]) { /* success */ __udp_remove_listener(IPPORT_BOOTPC); return 0; } } while ((MS_TICKS_DELAY() - start) < RETRY_TIME); } /* timed out */ __udp_remove_listener(IPPORT_BOOTPC); net_debug = 0; memcpy( __local_ip_addr, saved_ip_addr, sizeof(__local_ip_addr)); return -1; }
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