4d5d7be005
It's helpful to determine that a request was sent by grub in order to permit the server to provide different information at different stages of the boot process. Send GRUB2 as a type 77 DHCP option when sending bootp packets in order to make this possible.
598 lines
16 KiB
C
598 lines
16 KiB
C
/*
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* GRUB -- GRand Unified Bootloader
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* Copyright (C) 2010,2011 Free Software Foundation, Inc.
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*
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* GRUB is free software: you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* GRUB is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with GRUB. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include <grub/net.h>
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#include <grub/env.h>
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#include <grub/i18n.h>
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#include <grub/command.h>
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#include <grub/net/ip.h>
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#include <grub/net/netbuff.h>
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#include <grub/net/udp.h>
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#include <grub/datetime.h>
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static grub_uint8_t grub_userclass[] = {GRUB_NET_BOOTP_RFC1048_MAGIC_0,
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GRUB_NET_BOOTP_RFC1048_MAGIC_1,
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GRUB_NET_BOOTP_RFC1048_MAGIC_2,
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GRUB_NET_BOOTP_RFC1048_MAGIC_3,
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0x4D, 0x05, 'G', 'R', 'U', 'B', '2'};
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static void
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parse_dhcp_vendor (const char *name, const void *vend, int limit, int *mask)
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{
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const grub_uint8_t *ptr, *ptr0;
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ptr = ptr0 = vend;
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if (ptr[0] != GRUB_NET_BOOTP_RFC1048_MAGIC_0
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|| ptr[1] != GRUB_NET_BOOTP_RFC1048_MAGIC_1
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|| ptr[2] != GRUB_NET_BOOTP_RFC1048_MAGIC_2
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|| ptr[3] != GRUB_NET_BOOTP_RFC1048_MAGIC_3)
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return;
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ptr = ptr + sizeof (grub_uint32_t);
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while (ptr - ptr0 < limit)
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{
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grub_uint8_t tagtype;
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grub_uint8_t taglength;
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tagtype = *ptr++;
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/* Pad tag. */
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if (tagtype == GRUB_NET_BOOTP_PAD)
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continue;
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/* End tag. */
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if (tagtype == GRUB_NET_BOOTP_END)
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return;
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taglength = *ptr++;
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switch (tagtype)
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{
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case GRUB_NET_BOOTP_NETMASK:
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if (taglength == 4)
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{
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int i;
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for (i = 0; i < 32; i++)
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if (!(ptr[i / 8] & (1 << (7 - (i % 8)))))
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break;
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*mask = i;
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}
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break;
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case GRUB_NET_BOOTP_ROUTER:
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if (taglength == 4)
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{
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grub_net_network_level_netaddress_t target;
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grub_net_network_level_address_t gw;
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char *rname;
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target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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target.ipv4.base = 0;
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target.ipv4.masksize = 0;
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gw.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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grub_memcpy (&gw.ipv4, ptr, sizeof (gw.ipv4));
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rname = grub_xasprintf ("%s:default", name);
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if (rname)
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grub_net_add_route_gw (rname, target, gw);
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grub_free (rname);
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}
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break;
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case GRUB_NET_BOOTP_DNS:
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{
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int i;
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for (i = 0; i < taglength / 4; i++)
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{
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struct grub_net_network_level_address s;
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s.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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s.ipv4 = grub_get_unaligned32 (ptr);
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s.option = DNS_OPTION_PREFER_IPV4;
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grub_net_add_dns_server (&s);
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ptr += 4;
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}
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}
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continue;
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case GRUB_NET_BOOTP_HOSTNAME:
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grub_env_set_net_property (name, "hostname", (const char *) ptr,
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taglength);
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break;
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case GRUB_NET_BOOTP_DOMAIN:
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grub_env_set_net_property (name, "domain", (const char *) ptr,
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taglength);
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break;
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case GRUB_NET_BOOTP_ROOT_PATH:
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grub_env_set_net_property (name, "rootpath", (const char *) ptr,
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taglength);
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break;
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case GRUB_NET_BOOTP_EXTENSIONS_PATH:
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grub_env_set_net_property (name, "extensionspath", (const char *) ptr,
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taglength);
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break;
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/* If you need any other options please contact GRUB
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development team. */
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}
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ptr += taglength;
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}
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}
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#define OFFSET_OF(x, y) ((grub_size_t)((grub_uint8_t *)((y)->x) - (grub_uint8_t *)(y)))
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struct grub_net_network_level_interface *
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grub_net_configure_by_dhcp_ack (const char *name,
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struct grub_net_card *card,
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grub_net_interface_flags_t flags,
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const struct grub_net_bootp_packet *bp,
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grub_size_t size,
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int is_def, char **device, char **path)
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{
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grub_net_network_level_address_t addr;
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grub_net_link_level_address_t hwaddr;
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struct grub_net_network_level_interface *inter;
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int mask = -1;
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addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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addr.ipv4 = bp->your_ip;
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if (device)
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*device = 0;
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if (path)
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*path = 0;
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grub_memcpy (hwaddr.mac, bp->mac_addr,
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bp->hw_len < sizeof (hwaddr.mac) ? bp->hw_len
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: sizeof (hwaddr.mac));
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hwaddr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
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inter = grub_net_add_addr (name, card, &addr, &hwaddr, flags);
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#if 0
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/* This is likely based on misunderstanding. gateway_ip refers to
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address of BOOTP relay and should not be used after BOOTP transaction
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is complete.
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See RFC1542, 3.4 Interpretation of the 'giaddr' field
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*/
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if (bp->gateway_ip)
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{
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grub_net_network_level_netaddress_t target;
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grub_net_network_level_address_t gw;
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char *rname;
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target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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target.ipv4.base = bp->server_ip;
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target.ipv4.masksize = 32;
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gw.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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gw.ipv4 = bp->gateway_ip;
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rname = grub_xasprintf ("%s:gw", name);
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if (rname)
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grub_net_add_route_gw (rname, target, gw);
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grub_free (rname);
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target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
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target.ipv4.base = bp->gateway_ip;
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target.ipv4.masksize = 32;
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grub_net_add_route (name, target, inter);
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}
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#endif
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if (size > OFFSET_OF (boot_file, bp))
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grub_env_set_net_property (name, "boot_file", bp->boot_file,
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sizeof (bp->boot_file));
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if (is_def)
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grub_net_default_server = 0;
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if (is_def && !grub_net_default_server && bp->server_ip)
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{
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grub_net_default_server = grub_xasprintf ("%d.%d.%d.%d",
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((grub_uint8_t *) &bp->server_ip)[0],
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((grub_uint8_t *) &bp->server_ip)[1],
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((grub_uint8_t *) &bp->server_ip)[2],
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((grub_uint8_t *) &bp->server_ip)[3]);
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grub_print_error ();
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}
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if (is_def)
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{
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grub_env_set ("net_default_interface", name);
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grub_env_export ("net_default_interface");
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}
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if (device && !*device && bp->server_ip)
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{
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*device = grub_xasprintf ("tftp,%d.%d.%d.%d",
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((grub_uint8_t *) &bp->server_ip)[0],
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((grub_uint8_t *) &bp->server_ip)[1],
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((grub_uint8_t *) &bp->server_ip)[2],
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((grub_uint8_t *) &bp->server_ip)[3]);
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grub_print_error ();
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}
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if (size > OFFSET_OF (server_name, bp)
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&& bp->server_name[0])
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{
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grub_env_set_net_property (name, "dhcp_server_name", bp->server_name,
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sizeof (bp->server_name));
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if (is_def && !grub_net_default_server)
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{
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grub_net_default_server = grub_strdup (bp->server_name);
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grub_print_error ();
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}
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if (device && !*device)
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{
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*device = grub_xasprintf ("tftp,%s", bp->server_name);
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grub_print_error ();
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}
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}
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if (size > OFFSET_OF (boot_file, bp) && path)
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{
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*path = grub_strndup (bp->boot_file, sizeof (bp->boot_file));
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grub_print_error ();
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if (*path)
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{
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char *slash;
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slash = grub_strrchr (*path, '/');
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if (slash)
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*slash = 0;
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else
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**path = 0;
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}
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}
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if (size > OFFSET_OF (vendor, bp))
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parse_dhcp_vendor (name, &bp->vendor, size - OFFSET_OF (vendor, bp), &mask);
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grub_net_add_ipv4_local (inter, mask);
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inter->dhcp_ack = grub_malloc (size);
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if (inter->dhcp_ack)
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{
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grub_memcpy (inter->dhcp_ack, bp, size);
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inter->dhcp_acklen = size;
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}
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else
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grub_errno = GRUB_ERR_NONE;
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return inter;
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}
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void
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grub_net_process_dhcp (struct grub_net_buff *nb,
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struct grub_net_card *card)
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{
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char *name;
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struct grub_net_network_level_interface *inf;
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name = grub_xasprintf ("%s:dhcp", card->name);
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if (!name)
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{
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grub_print_error ();
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return;
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}
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grub_net_configure_by_dhcp_ack (name, card,
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0, (const struct grub_net_bootp_packet *) nb->data,
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(nb->tail - nb->data), 0, 0, 0);
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grub_free (name);
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if (grub_errno)
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grub_print_error ();
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else
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{
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FOR_NET_NETWORK_LEVEL_INTERFACES(inf)
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if (grub_memcmp (inf->name, card->name, grub_strlen (card->name)) == 0
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&& grub_memcmp (inf->name + grub_strlen (card->name),
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":dhcp_tmp", sizeof (":dhcp_tmp") - 1) == 0)
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{
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grub_net_network_level_interface_unregister (inf);
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break;
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}
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}
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}
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static char
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hexdigit (grub_uint8_t val)
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{
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if (val < 10)
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return val + '0';
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return val + 'a' - 10;
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}
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static grub_err_t
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grub_cmd_dhcpopt (struct grub_command *cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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struct grub_net_network_level_interface *inter;
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int num;
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grub_uint8_t *ptr;
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grub_uint8_t taglength;
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if (argc < 4)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("four arguments expected"));
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FOR_NET_NETWORK_LEVEL_INTERFACES (inter)
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if (grub_strcmp (inter->name, args[1]) == 0)
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break;
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if (!inter)
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unrecognised network interface `%s'"), args[1]);
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if (!inter->dhcp_ack)
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return grub_error (GRUB_ERR_IO, N_("no DHCP info found"));
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if (inter->dhcp_acklen <= OFFSET_OF (vendor, inter->dhcp_ack))
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return grub_error (GRUB_ERR_IO, N_("no DHCP options found"));
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num = grub_strtoul (args[2], 0, 0);
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if (grub_errno)
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return grub_errno;
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ptr = inter->dhcp_ack->vendor;
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if (ptr[0] != GRUB_NET_BOOTP_RFC1048_MAGIC_0
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|| ptr[1] != GRUB_NET_BOOTP_RFC1048_MAGIC_1
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|| ptr[2] != GRUB_NET_BOOTP_RFC1048_MAGIC_2
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|| ptr[3] != GRUB_NET_BOOTP_RFC1048_MAGIC_3)
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return grub_error (GRUB_ERR_IO, N_("no DHCP options found"));
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ptr = ptr + sizeof (grub_uint32_t);
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while (1)
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{
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grub_uint8_t tagtype;
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if (ptr >= ((grub_uint8_t *) inter->dhcp_ack) + inter->dhcp_acklen)
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return grub_error (GRUB_ERR_IO, N_("no DHCP option %d found"), num);
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tagtype = *ptr++;
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/* Pad tag. */
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if (tagtype == 0)
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continue;
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/* End tag. */
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if (tagtype == 0xff)
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return grub_error (GRUB_ERR_IO, N_("no DHCP option %d found"), num);
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taglength = *ptr++;
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if (tagtype == num)
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break;
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ptr += taglength;
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}
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if (grub_strcmp (args[3], "string") == 0)
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{
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char *val = grub_malloc (taglength + 1);
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if (!val)
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return grub_errno;
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grub_memcpy (val, ptr, taglength);
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val[taglength] = 0;
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if (args[0][0] == '-' && args[0][1] == 0)
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grub_printf ("%s\n", val);
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else
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return grub_env_set (args[0], val);
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return GRUB_ERR_NONE;
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}
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if (grub_strcmp (args[3], "number") == 0)
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{
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grub_uint64_t val = 0;
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int i;
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for (i = 0; i < taglength; i++)
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val = (val << 8) | ptr[i];
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if (args[0][0] == '-' && args[0][1] == 0)
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grub_printf ("%llu\n", (unsigned long long) val);
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else
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{
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char valn[64];
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grub_snprintf (valn, sizeof (valn), "%lld\n", (unsigned long long) val);
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return grub_env_set (args[0], valn);
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}
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return GRUB_ERR_NONE;
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}
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if (grub_strcmp (args[3], "hex") == 0)
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{
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char *val = grub_malloc (2 * taglength + 1);
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int i;
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if (!val)
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return grub_errno;
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for (i = 0; i < taglength; i++)
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{
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val[2 * i] = hexdigit (ptr[i] >> 4);
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val[2 * i + 1] = hexdigit (ptr[i] & 0xf);
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}
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val[2 * taglength] = 0;
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if (args[0][0] == '-' && args[0][1] == 0)
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grub_printf ("%s\n", val);
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else
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return grub_env_set (args[0], val);
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return GRUB_ERR_NONE;
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}
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return grub_error (GRUB_ERR_BAD_ARGUMENT,
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N_("unrecognised DHCP option format specification `%s'"),
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args[3]);
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}
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/* FIXME: allow to specify mac address. */
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static grub_err_t
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grub_cmd_bootp (struct grub_command *cmd __attribute__ ((unused)),
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int argc, char **args)
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{
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struct grub_net_card *card;
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struct grub_net_network_level_interface *ifaces;
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grub_size_t ncards = 0;
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unsigned j = 0;
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int interval;
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grub_err_t err;
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FOR_NET_CARDS (card)
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{
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if (argc > 0 && grub_strcmp (card->name, args[0]) != 0)
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continue;
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ncards++;
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}
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if (ncards == 0)
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return grub_error (GRUB_ERR_NET_NO_CARD, N_("no network card found"));
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ifaces = grub_zalloc (ncards * sizeof (ifaces[0]));
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if (!ifaces)
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return grub_errno;
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j = 0;
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FOR_NET_CARDS (card)
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{
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if (argc > 0 && grub_strcmp (card->name, args[0]) != 0)
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continue;
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ifaces[j].card = card;
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ifaces[j].next = &ifaces[j+1];
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if (j)
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ifaces[j].prev = &ifaces[j-1].next;
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ifaces[j].name = grub_xasprintf ("%s:dhcp_tmp", card->name);
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card->num_ifaces++;
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if (!ifaces[j].name)
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{
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unsigned i;
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for (i = 0; i < j; i++)
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grub_free (ifaces[i].name);
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grub_free (ifaces);
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return grub_errno;
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}
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ifaces[j].address.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_DHCP_RECV;
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grub_memcpy (&ifaces[j].hwaddress, &card->default_address,
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sizeof (ifaces[j].hwaddress));
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j++;
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}
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ifaces[ncards - 1].next = grub_net_network_level_interfaces;
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if (grub_net_network_level_interfaces)
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grub_net_network_level_interfaces->prev = & ifaces[ncards - 1].next;
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grub_net_network_level_interfaces = &ifaces[0];
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ifaces[0].prev = &grub_net_network_level_interfaces;
|
|
for (interval = 200; interval < 10000; interval *= 2)
|
|
{
|
|
int done = 0;
|
|
for (j = 0; j < ncards; j++)
|
|
{
|
|
struct grub_net_bootp_packet *pack;
|
|
struct grub_datetime date;
|
|
grub_int32_t t = 0;
|
|
struct grub_net_buff *nb;
|
|
struct udphdr *udph;
|
|
grub_net_network_level_address_t target;
|
|
grub_net_link_level_address_t ll_target;
|
|
|
|
if (!ifaces[j].prev)
|
|
continue;
|
|
nb = grub_netbuff_alloc (sizeof (*pack) + 64 + 128);
|
|
if (!nb)
|
|
{
|
|
grub_netbuff_free (nb);
|
|
return grub_errno;
|
|
}
|
|
err = grub_netbuff_reserve (nb, sizeof (*pack) + 64 + 128);
|
|
if (err)
|
|
{
|
|
grub_netbuff_free (nb);
|
|
return err;
|
|
}
|
|
err = grub_netbuff_push (nb, sizeof (*pack) + 64);
|
|
if (err)
|
|
{
|
|
grub_netbuff_free (nb);
|
|
return err;
|
|
}
|
|
pack = (void *) nb->data;
|
|
done = 1;
|
|
grub_memset (pack, 0, sizeof (*pack) + 64);
|
|
pack->opcode = 1;
|
|
pack->hw_type = 1;
|
|
pack->hw_len = 6;
|
|
err = grub_get_datetime (&date);
|
|
if (err || !grub_datetime2unixtime (&date, &t))
|
|
{
|
|
grub_errno = GRUB_ERR_NONE;
|
|
t = 0;
|
|
}
|
|
pack->ident = grub_cpu_to_be32 (t);
|
|
pack->seconds = grub_cpu_to_be16 (t);
|
|
|
|
grub_memcpy (&pack->mac_addr, &ifaces[j].hwaddress.mac, 6);
|
|
grub_memcpy (&pack->vendor, grub_userclass, sizeof(grub_userclass));
|
|
|
|
grub_netbuff_push (nb, sizeof (*udph));
|
|
|
|
udph = (struct udphdr *) nb->data;
|
|
udph->src = grub_cpu_to_be16_compile_time (68);
|
|
udph->dst = grub_cpu_to_be16_compile_time (67);
|
|
udph->chksum = 0;
|
|
udph->len = grub_cpu_to_be16 (nb->tail - nb->data);
|
|
target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
|
|
target.ipv4 = 0xffffffff;
|
|
err = grub_net_link_layer_resolve (&ifaces[j], &target, &ll_target);
|
|
if (err)
|
|
return err;
|
|
|
|
udph->chksum = grub_net_ip_transport_checksum (nb, GRUB_NET_IP_UDP,
|
|
&ifaces[j].address,
|
|
&target);
|
|
|
|
err = grub_net_send_ip_packet (&ifaces[j], &target, &ll_target, nb,
|
|
GRUB_NET_IP_UDP);
|
|
grub_netbuff_free (nb);
|
|
if (err)
|
|
return err;
|
|
}
|
|
if (!done)
|
|
break;
|
|
grub_net_poll_cards (interval, 0);
|
|
}
|
|
|
|
err = GRUB_ERR_NONE;
|
|
for (j = 0; j < ncards; j++)
|
|
{
|
|
grub_free (ifaces[j].name);
|
|
if (!ifaces[j].prev)
|
|
continue;
|
|
grub_error_push ();
|
|
grub_net_network_level_interface_unregister (&ifaces[j]);
|
|
err = grub_error (GRUB_ERR_FILE_NOT_FOUND,
|
|
N_("couldn't autoconfigure %s"),
|
|
ifaces[j].card->name);
|
|
}
|
|
|
|
grub_free (ifaces);
|
|
return err;
|
|
}
|
|
|
|
static grub_command_t cmd_getdhcp, cmd_bootp;
|
|
|
|
void
|
|
grub_bootp_init (void)
|
|
{
|
|
cmd_bootp = grub_register_command ("net_bootp", grub_cmd_bootp,
|
|
N_("[CARD]"),
|
|
N_("perform a bootp autoconfiguration"));
|
|
cmd_getdhcp = grub_register_command ("net_get_dhcp_option", grub_cmd_dhcpopt,
|
|
N_("VAR INTERFACE NUMBER DESCRIPTION"),
|
|
N_("retrieve DHCP option and save it into VAR. If VAR is - then print the value."));
|
|
}
|
|
|
|
void
|
|
grub_bootp_fini (void)
|
|
{
|
|
grub_unregister_command (cmd_getdhcp);
|
|
grub_unregister_command (cmd_bootp);
|
|
}
|