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grub/grub-core/net/net.c

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/*
* GRUB -- GRand Unified Bootloader
* Copyright (C) 2010 Free Software Foundation, Inc.
*
* GRUB 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 3 of the License, or
* (at your option) any later version.
*
* GRUB 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 GRUB. If not, see <http://www.gnu.org/licenses/>.
*/
#include <grub/net.h>
#include <grub/net/netbuff.h>
#include <grub/time.h>
#include <grub/file.h>
#include <grub/i18n.h>
#include <grub/mm.h>
#include <grub/misc.h>
#include <grub/dl.h>
#include <grub/command.h>
#include <grub/env.h>
struct grub_net_route
{
struct grub_net_route *next;
grub_net_network_level_netaddress_t target;
char *name;
struct grub_net_network_level_protocol *prot;
int is_gateway;
union
{
struct grub_net_network_level_interface *interface;
grub_net_network_level_address_t gw;
};
};
struct grub_net_route *grub_net_routes = NULL;
struct grub_net_network_level_interface *grub_net_network_level_interfaces = NULL;
struct grub_net_card *grub_net_cards = NULL;
struct grub_net_card_driver *grub_net_card_drivers = NULL;
struct grub_net_network_level_protocol *grub_net_network_level_protocols = NULL;
static inline void
grub_net_network_level_interface_unregister (struct grub_net_network_level_interface *inter)
{
grub_list_remove (GRUB_AS_LIST_P (&grub_net_network_level_interfaces),
GRUB_AS_LIST (inter));
}
static inline void
grub_net_route_register (struct grub_net_route *route)
{
grub_list_push (GRUB_AS_LIST_P (&grub_net_routes),
GRUB_AS_LIST (route));
}
static inline void
grub_net_route_unregister (struct grub_net_route *route)
{
grub_list_remove (GRUB_AS_LIST_P (&grub_net_routes),
GRUB_AS_LIST (route));
}
#define FOR_NET_ROUTES(var) for (var = grub_net_routes; var; var = var->next)
static int
parse_ip (const char *val, grub_uint32_t *ip, const char **rest)
{
grub_uint32_t newip = 0;
unsigned long t;
int i;
const char *ptr = val;
for (i = 0; i < 4; i++)
{
t = grub_strtoul (ptr, (char **) &ptr, 0);
if (grub_errno)
{
grub_errno = GRUB_ERR_NONE;
return 0;
}
if (t & ~0xff)
return 0;
newip >>= 8;
newip |= (t << 24);
if (i != 3 && *ptr != '.')
return 0;
ptr++;
}
*ip = grub_cpu_to_le32 (newip);
if (rest)
*rest = ptr - 1;
return 1;
}
static int
match_net (const grub_net_network_level_netaddress_t *net,
const grub_net_network_level_address_t *addr)
{
if (net->type != addr->type)
return 0;
switch (net->type)
{
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
{
grub_int32_t mask = ((1 << net->ipv4.masksize) - 1) << (32 - net->ipv4.masksize);
return ((grub_be_to_cpu32 (net->ipv4.base) & mask)
== (grub_be_to_cpu32 (addr->ipv4) & mask));
}
}
return 0;
}
grub_err_t
grub_net_resolve_address (const char *name,
grub_net_network_level_address_t *addr)
{
if (parse_ip (name, &addr->ipv4, NULL))
{
addr->type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
return GRUB_ERR_NONE;
}
return grub_error (GRUB_ERR_NET_BAD_ADDRESS, N_("unrecognised address %s"),
name);
}
grub_err_t
grub_net_resolve_net_address (const char *name,
grub_net_network_level_netaddress_t *addr)
{
const char *rest;
if (parse_ip (name, &addr->ipv4.base, &rest))
{
addr->type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
if (*rest == '/')
{
addr->ipv4.masksize = grub_strtoul (rest + 1, NULL, 0);
if (!grub_errno)
return GRUB_ERR_NONE;
}
addr->ipv4.masksize = 32;
return GRUB_ERR_NONE;
}
return grub_error (GRUB_ERR_NET_BAD_ADDRESS, N_("unrecognised address %s"),
name);
}
grub_err_t
grub_net_route_address (grub_net_network_level_address_t addr,
grub_net_network_level_address_t *gateway,
struct grub_net_network_level_interface **interf)
{
struct grub_net_route *route;
int depth = 0;
int routecnt = 0;
struct grub_net_network_level_protocol *prot = NULL;
grub_net_network_level_address_t curtarget = addr;
*gateway = addr;
FOR_NET_ROUTES(route)
routecnt++;
for (depth = 0; depth < routecnt + 2; depth++)
{
FOR_NET_ROUTES(route)
{
if (depth && prot != route->prot)
continue;
if (!match_net (&route->target, &curtarget))
continue;
if (route->is_gateway)
{
if (depth == 0)
*gateway = route->gw;
curtarget = route->gw;
break;
}
*interf = route->interface;
return GRUB_ERR_NONE;
}
if (route == NULL)
return grub_error (GRUB_ERR_NET_NO_ROUTE, "destination unreachable");
}
return grub_error (GRUB_ERR_NET_ROUTE_LOOP, "route loop detected");
}
static grub_err_t
grub_cmd_deladdr (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_net_network_level_interface *inter;
if (argc != 4)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
FOR_NET_NETWORK_LEVEL_INTERFACES (inter)
if (grub_strcmp (inter->name, args[1]))
break;
if (inter == NULL)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("address not found"));
if (inter->flags & GRUB_NET_INTERFACE_PERMANENT)
return grub_error (GRUB_ERR_IO,
N_("you can't delete this address"));
grub_net_network_level_interface_unregister (inter);
grub_free (inter->name);
grub_free (inter);
return GRUB_ERR_NONE;
}
void
grub_net_addr_to_str (const grub_net_network_level_address_t *target, char *buf)
{
switch (target->type)
{
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
{
grub_uint32_t n = grub_be_to_cpu32 (target->ipv4);
grub_snprintf (buf, GRUB_NET_MAX_STR_ADDR_LEN, "%d.%d.%d.%d",
((n >> 24) & 0xff), ((n >> 16) & 0xff),
((n >> 8) & 0xff), ((n >> 0) & 0xff));
}
return;
}
grub_printf ("Unknown address type %d\n", target->type);
}
/*
Currently suppoerted adresses:
ethernet: XX:XX:XX:XX:XX:XX
*/
#define MAX_STR_HWADDR_LEN (sizeof ("XX:XX:XX:XX:XX:XX"))
static void
hwaddr_to_str (const grub_net_link_level_address_t *addr, char *str)
{
str[0] = 0;
switch (addr->type)
{
case GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET:
{
char *ptr;
unsigned i;
for (ptr = str, i = 0; i < ARRAY_SIZE (addr->mac); i++)
{
grub_snprintf (ptr, MAX_STR_HWADDR_LEN - (ptr - str),
"%02x:", addr->mac[i] & 0xff);
ptr += (sizeof ("XX:") - 1);
}
return;
}
}
grub_printf ("Unsupported hw address type %d\n", addr->type);
}
/* FIXME: implement this. */
static char *
hwaddr_set_env (struct grub_env_var *var __attribute__ ((unused)),
const char *val __attribute__ ((unused)))
{
return NULL;
}
/* FIXME: implement this. */
static char *
addr_set_env (struct grub_env_var *var __attribute__ ((unused)),
const char *val __attribute__ ((unused)))
{
return NULL;
}
static void
grub_net_network_level_interface_register (struct grub_net_network_level_interface *inter)
{
{
char buf[MAX_STR_HWADDR_LEN];
char name[grub_strlen (inter->name) + sizeof ("net__mac")];
hwaddr_to_str (&inter->hwaddress, buf);
grub_snprintf (name, sizeof (name), "net_%s_mac", inter->name);
grub_env_set (name, buf);
grub_register_variable_hook (name, 0, hwaddr_set_env);
}
{
char buf[GRUB_NET_MAX_STR_ADDR_LEN];
char name[grub_strlen (inter->name) + sizeof ("net__ip")];
grub_net_addr_to_str (&inter->address, buf);
grub_snprintf (name, sizeof (name), "net_%s_ip", inter->name);
grub_env_set (name, buf);
grub_register_variable_hook (name, 0, addr_set_env);
}
grub_list_push (GRUB_AS_LIST_P (&grub_net_network_level_interfaces),
GRUB_AS_LIST (inter));
}
struct grub_net_network_level_interface *
grub_net_add_addr (const char *name, struct grub_net_card *card,
grub_net_network_level_address_t addr,
grub_net_link_level_address_t hwaddress,
grub_net_interface_flags_t flags)
{
struct grub_net_network_level_interface *inter;
inter = grub_zalloc (sizeof (*inter));
if (!inter)
return NULL;
inter->name = grub_strdup (name);
grub_memcpy (&(inter->address), &addr, sizeof (inter->address));
grub_memcpy (&(inter->hwaddress), &hwaddress, sizeof (inter->hwaddress));
inter->flags = flags;
inter->card = card;
inter->dhcp_ack = NULL;
inter->dhcp_acklen = 0;
grub_net_network_level_interface_register (inter);
return inter;
}
/* FIXME: support MAC specifying. */
static grub_err_t
grub_cmd_addaddr (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_net_card *card;
grub_net_network_level_address_t addr;
grub_err_t err;
grub_net_interface_flags_t flags = 0;
if (argc != 3)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("three arguments expected"));
FOR_NET_CARDS (card)
if (grub_strcmp (card->name, args[1]) == 0)
break;
if (card == NULL)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("card not found"));
err = grub_net_resolve_address (args[2], &addr);
if (err)
return err;
if (card->flags & GRUB_NET_CARD_NO_MANUAL_INTERFACES)
return grub_error (GRUB_ERR_IO,
"this card doesn't support address addition");
if (card->flags & GRUB_NET_CARD_HWADDRESS_IMMUTABLE)
flags |= GRUB_NET_INTERFACE_HWADDRESS_IMMUTABLE;
grub_net_add_addr (args[0], card, addr, card->default_address,
flags);
return grub_errno;
}
static grub_err_t
grub_cmd_delroute (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_net_route *route;
struct grub_net_route **prev;
if (argc != 1)
return grub_error (GRUB_ERR_BAD_ARGUMENT, N_("one argument expected"));
for (prev = &grub_net_routes, route = *prev; route; prev = &((*prev)->next),
route = *prev)
if (grub_strcmp (route->name, args[0]) == 0)
{
*prev = route->next;
grub_free (route->name);
grub_free (route);
}
return GRUB_ERR_NONE;
}
grub_err_t
grub_net_add_route (const char *name,
grub_net_network_level_netaddress_t target,
struct grub_net_network_level_interface *inter)
{
struct grub_net_route *route;
route = grub_zalloc (sizeof (*route));
if (!route)
return grub_errno;
route->name = grub_strdup (name);
if (!route->name)
{
grub_free (route);
return grub_errno;
}
route->target = target;
route->is_gateway = 0;
route->interface = inter;
grub_net_route_register (route);
return GRUB_ERR_NONE;
}
grub_err_t
grub_net_add_route_gw (const char *name,
grub_net_network_level_netaddress_t target,
grub_net_network_level_address_t gw)
{
struct grub_net_route *route;
route = grub_zalloc (sizeof (*route));
if (!route)
return grub_errno;
route->name = grub_strdup (name);
if (!route->name)
{
grub_free (route);
return grub_errno;
}
route->target = target;
route->is_gateway = 1;
route->gw = gw;
grub_net_route_register (route);
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_addroute (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
grub_net_network_level_netaddress_t target;
if (argc < 3)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("At least 3 arguments are expected"));
grub_net_resolve_net_address (args[1], &target);
if (grub_strcmp (args[2], "gw") == 0 && argc >= 4)
{
grub_err_t err;
grub_net_network_level_address_t gw;
err = grub_net_resolve_address (args[3], &gw);
if (err)
return err;
return grub_net_add_route_gw (args[0], target, gw);
}
else
{
struct grub_net_network_level_interface *inter;
FOR_NET_NETWORK_LEVEL_INTERFACES (inter)
if (grub_strcmp (inter->name, args[2]) == 0)
break;
if (!inter)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unrecognised interface %s"), args[2]);
return grub_net_add_route (args[0], target, inter);
}
}
static void
print_net_address (const grub_net_network_level_netaddress_t *target)
{
switch (target->type)
{
case GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4:
{
grub_uint32_t n = grub_be_to_cpu32 (target->ipv4.base);
grub_printf ("%d.%d.%d.%d/%d ", ((n >> 24) & 0xff),
((n >> 16) & 0xff),
((n >> 8) & 0xff),
((n >> 0) & 0xff),
target->ipv4.masksize);
}
return;
}
grub_printf ("Unknown address type %d\n", target->type);
}
static void
print_address (const grub_net_network_level_address_t *target)
{
char buf[GRUB_NET_MAX_STR_ADDR_LEN];
grub_net_addr_to_str (target, buf);
grub_xputs (buf);
}
static grub_err_t
grub_cmd_listroutes (struct grub_command *cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
struct grub_net_route *route;
FOR_NET_ROUTES(route)
{
grub_printf ("%s ", route->name);
print_net_address (&route->target);
if (route->is_gateway)
{
grub_printf ("gw ");
print_address (&route->gw);
}
else
grub_printf ("%s", route->interface->name);
grub_printf ("\n");
}
return GRUB_ERR_NONE;
}
static grub_err_t
grub_cmd_listcards (struct grub_command *cmd __attribute__ ((unused)),
int argc __attribute__ ((unused)),
char **args __attribute__ ((unused)))
{
struct grub_net_card *card;
FOR_NET_CARDS(card)
{
grub_printf ("%s ", card->name);
}
grub_printf ("\n");
return GRUB_ERR_NONE;
}
grub_net_app_level_t grub_net_app_level_list;
struct grub_net_socket *grub_net_sockets;
static grub_net_t
grub_net_open_real (const char *name)
{
const char *comma = grub_strchr (name, ',');
grub_net_app_level_t proto;
if (!comma)
comma = name + grub_strlen (name);
FOR_NET_APP_LEVEL (proto)
{
if (comma - name == (grub_ssize_t) grub_strlen (proto->name)
&& grub_memcmp (proto->name, name, comma - name) == 0)
{
grub_net_t ret = grub_malloc (sizeof (*ret));
if (!ret)
return NULL;
ret->protocol = proto;
ret->name = grub_strdup (name);
if (!ret->name)
{
grub_free (ret);
return NULL;
}
return ret;
}
}
grub_error (GRUB_ERR_UNKNOWN_DEVICE, "no such device");
return NULL;
}
static grub_err_t
grub_net_file_open_real (struct grub_file *file, const char *name)
{
grub_err_t err;
grub_net_network_level_address_t addr;
struct grub_net_network_level_interface *inf;
grub_net_network_level_address_t gateway;
grub_net_socket_t socket;
static int port = 25300;
err = grub_net_resolve_address (file->device->net->name
+ sizeof (file->device->net->protocol->name) + 1, &addr);
if (err)
return err;
err = grub_net_route_address (addr, &gateway, &inf);
if (err)
return err;
if ((socket = (grub_net_socket_t) grub_malloc (sizeof (*socket))) == NULL)
return GRUB_ERR_OUT_OF_MEMORY;
socket->inf = inf;
socket->out_nla = addr;
socket->in_port = port++;
socket->status = 0;
socket->app = file->device->net->protocol;
socket->packs = NULL;
file->device->net->socket = socket;
grub_net_socket_register (socket);
if ((err = file->device->net->protocol->open (file,name)))
goto fail;
return GRUB_ERR_NONE;
fail:
grub_net_socket_unregister (socket);
grub_free (socket);
return err;
}
static grub_err_t
receive_packets (struct grub_net_card *card)
{
/* Maybe should be better have a fixed number of packets for each card
and just mark them as used and not used. */
struct grub_net_buff *nb;
nb = grub_netbuff_alloc (1500);
if (!nb)
return grub_errno;
card->driver->recv (card, nb);
return GRUB_ERR_NONE;
}
void
grub_net_pool_cards (unsigned time)
{
struct grub_net_card *card;
grub_uint64_t start_time;
FOR_NET_CARDS (card)
{
start_time = grub_get_time_ms ();
while( (grub_get_time_ms () - start_time) < time)
receive_packets (card);
}
}
static grub_ssize_t
process_packets (grub_file_t file, void *buf, grub_size_t len,
void *NESTED_FUNC_ATTR (hook) (void *dest, const void *src, grub_size_t n))
{
grub_net_socket_t sock = file->device->net->socket;
struct grub_net_buff *nb;
char *ptr = (char *) buf;
grub_size_t amount, total = 0;
int try = 0;
while (try <= 3)
{
while (sock->packs->first)
{
try = 0;
nb = sock->packs->first->nb;
amount = (grub_size_t)(len <= (grub_size_t) (nb->tail - nb->data))? len :(grub_size_t)(nb->tail - nb->data);
len -= amount;
total += amount;
hook (ptr, nb->data, amount);
ptr += amount;
if (amount == (grub_size_t) (nb->tail - nb->data))
{
grub_netbuff_free (nb);
grub_net_remove_packet (sock->packs->first);
}
else
nb->data += amount;
if (!len)
return total;
}
if (sock->status == 1)
{
try++;
grub_net_pool_cards (200);
}
else
return total;
}
return total;
}
/* Read from the packets list*/
static grub_ssize_t
grub_net_read_real (grub_file_t file, void *buf, grub_size_t len )
{
auto void *NESTED_FUNC_ATTR memcpy_hook (void *dest, const void *src, grub_size_t n);
void *NESTED_FUNC_ATTR memcpy_hook (void *dest __attribute__ ((unused)), const void *src __attribute__ ((unused)),
grub_size_t n __attribute__ ((unused)))
{
return grub_memcpy (dest, src, n);
}
return process_packets (file, buf, len, memcpy_hook);
}
/* Read from the packets list*/
static grub_err_t
grub_net_seek_real (struct grub_file *file, grub_off_t offset)
{
grub_net_socket_t sock = file->device->net->socket;
struct grub_net_buff *nb;
grub_size_t len = offset - file->offset;
if (!len)
return GRUB_ERR_NONE;
/* We cant seek backwards past the current packet. */
if (file->offset > offset)
{
nb = sock->packs->first->nb;
return grub_netbuff_push (nb, file->offset - offset);
}
auto void *NESTED_FUNC_ATTR dummy (void *dest, const void *src, grub_size_t n);
void *NESTED_FUNC_ATTR dummy (void *dest __attribute__ ((unused)), const void *src __attribute__ ((unused)),
grub_size_t n __attribute__ ((unused)))
{
return NULL;
}
process_packets (file, NULL, len, dummy);
return GRUB_ERR_NONE;
}
static char *
grub_env_write_readonly (struct grub_env_var *var __attribute__ ((unused)),
const char *val __attribute__ ((unused)))
{
return NULL;
}
static void
set_env_limn_ro (const char *intername, const char *suffix,
char *value, grub_size_t len)
{
char c;
char varname[sizeof ("net_") + grub_strlen (intername) + sizeof ("_")
+ grub_strlen (suffix)];
grub_snprintf (varname, sizeof (varname), "net_%s_%s", intername, suffix);
c = value[len];
value[len] = 0;
grub_env_set (varname, value);
value[len] = c;
grub_register_variable_hook (varname, 0, grub_env_write_readonly);
}
static void
parse_dhcp_vendor (const char *name, void *vend, int limit)
{
grub_uint8_t *ptr, *ptr0;
ptr = ptr0 = vend;
if (grub_be_to_cpu32 (*(grub_uint32_t *) ptr) != GRUB_NET_BOOTP_RFC1048_MAGIC)
return;
ptr = ptr + sizeof (grub_uint32_t);
while (ptr - ptr0 < limit)
{
grub_uint8_t tagtype;
grub_uint8_t taglength;
tagtype = *ptr++;
/* Pad tag. */
if (tagtype == 0)
continue;
/* End tag. */
if (tagtype == 0xff)
return;
taglength = *ptr++;
switch (tagtype)
{
case 12:
set_env_limn_ro (name, "hostname", (char *) ptr, taglength);
break;
case 15:
set_env_limn_ro (name, "domain", (char *) ptr, taglength);
break;
case 17:
set_env_limn_ro (name, "rootpath", (char *) ptr, taglength);
break;
case 18:
set_env_limn_ro (name, "extensionspath", (char *) ptr, taglength);
break;
/* If you need any other options please contact GRUB
developpement team. */
}
ptr += taglength;
}
}
#define OFFSET_OF(x, y) ((grub_uint8_t *)((y)->x) - (grub_uint8_t *)(y))
struct grub_net_network_level_interface *
grub_net_configure_by_dhcp_ack (const char *name, struct grub_net_card *card,
grub_net_interface_flags_t flags,
struct grub_net_bootp_ack *bp,
grub_size_t size)
{
grub_net_network_level_address_t addr;
grub_net_link_level_address_t hwaddr;
struct grub_net_network_level_interface *inter;
addr.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
addr.ipv4 = bp->your_ip;
grub_memcpy (hwaddr.mac, bp->mac_addr,
bp->hw_len < sizeof (hwaddr.mac) ? bp->hw_len
: sizeof (hwaddr.mac));
hwaddr.type = GRUB_NET_LINK_LEVEL_PROTOCOL_ETHERNET;
inter = grub_net_add_addr (name, card, addr, hwaddr, flags);
if (bp->gateway_ip != bp->server_ip)
{
grub_net_network_level_netaddress_t target;
grub_net_network_level_address_t gw;
char rname[grub_strlen (name) + sizeof ("_gw")];
target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
target.ipv4.base = bp->server_ip;
target.ipv4.masksize = 32;
gw.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
gw.ipv4 = bp->gateway_ip;
grub_snprintf (rname, sizeof (rname), "%s_gw", name);
grub_net_add_route_gw (rname, target, gw);
}
{
grub_net_network_level_netaddress_t target;
target.type = GRUB_NET_NETWORK_LEVEL_PROTOCOL_IPV4;
target.ipv4.base = bp->gateway_ip;
target.ipv4.masksize = 32;
grub_net_add_route (name, target, inter);
}
if (size > OFFSET_OF (boot_file, bp))
set_env_limn_ro (name, "boot_file", (char *) bp->boot_file,
sizeof (bp->boot_file));
if (size > OFFSET_OF (server_name, bp))
set_env_limn_ro (name, "dhcp_server_name", (char *) bp->server_name,
sizeof (bp->server_name));
if (size > OFFSET_OF (vendor, bp))
parse_dhcp_vendor (name, &bp->vendor, size - OFFSET_OF (vendor, bp));
inter->dhcp_ack = grub_malloc (size);
if (inter->dhcp_ack)
{
grub_memcpy (inter->dhcp_ack, bp, size);
inter->dhcp_acklen = size;
}
else
grub_errno = GRUB_ERR_NONE;
return inter;
}
static char
hexdigit (grub_uint8_t val)
{
if (val < 10)
return val + '0';
return val + 'a' - 10;
}
static grub_err_t
grub_cmd_dhcpopt (struct grub_command *cmd __attribute__ ((unused)),
int argc, char **args)
{
struct grub_net_network_level_interface *inter;
int num;
grub_uint8_t *ptr;
grub_uint8_t taglength;
if (argc < 4)
return grub_error (GRUB_ERR_BAD_ARGUMENT, "4 arguments expected");
FOR_NET_NETWORK_LEVEL_INTERFACES (inter)
if (grub_strcmp (inter->name, args[1]))
break;
if (!inter)
return grub_error (GRUB_ERR_BAD_ARGUMENT,
N_("unrecognised interface %s"), args[1]);
if (!inter->dhcp_ack)
return grub_error (GRUB_ERR_IO, N_("no DHCP info found"));
if (inter->dhcp_acklen <= OFFSET_OF (vendor, inter->dhcp_ack))
return grub_error (GRUB_ERR_IO, N_("no DHCP options found"));
num = grub_strtoul (args[2], 0, 0);
if (grub_errno)
return grub_errno;
ptr = inter->dhcp_ack->vendor;
if (grub_be_to_cpu32 (*(grub_uint32_t *) ptr)
!= GRUB_NET_BOOTP_RFC1048_MAGIC)
return grub_error (GRUB_ERR_IO, N_("no DHCP options found"));
ptr = ptr + sizeof (grub_uint32_t);
while (1)
{
grub_uint8_t tagtype;
if (ptr >= ((grub_uint8_t *) inter->dhcp_ack) + inter->dhcp_acklen)
return grub_error (GRUB_ERR_IO, N_("no DHCP option %d found"), num);
tagtype = *ptr++;
/* Pad tag. */
if (tagtype == 0)
continue;
/* End tag. */
if (tagtype == 0xff)
return grub_error (GRUB_ERR_IO, N_("no DHCP option %d found"), num);
taglength = *ptr++;
if (tagtype == num)
break;
ptr += taglength;
}
if (grub_strcmp (args[3], "string") == 0)
{
char *val = grub_malloc (taglength + 1);
if (!val)
return grub_errno;
grub_memcpy (val, ptr, taglength);
val[taglength] = 0;
if (args[0][0] == '-' && args[0][1] == 0)
grub_printf ("%s\n", val);
else
return grub_env_set (args[0], val);
return GRUB_ERR_NONE;
}
if (grub_strcmp (args[3], "number") == 0)
{
grub_uint64_t val = 0;
int i;
for (i = 0; i < taglength; i++)
val = (val << 8) | ptr[i];
if (args[0][0] == '-' && args[0][1] == 0)
grub_printf ("%llu\n", (unsigned long long) val);
else
{
char valn[64];
grub_printf (valn, sizeof (valn), "%lld\n", (unsigned long long) val);
return grub_env_set (args[0], valn);
}
return GRUB_ERR_NONE;
}
if (grub_strcmp (args[3], "hex") == 0)
{
char *val = grub_malloc (2 * taglength + 1);
int i;
if (!val)
return grub_errno;
for (i = 0; i < taglength; i++)
{
val[2 * i] = hexdigit (ptr[i] >> 4);
val[2 * i + 1] = hexdigit (ptr[i] & 0xf);
}
val[2 * taglength] = 0;
if (args[0][0] == '-' && args[0][1] == 0)
grub_printf ("%s\n", val);
else
return grub_env_set (args[0], val);
return GRUB_ERR_NONE;
}
return grub_error (GRUB_ERR_BAD_ARGUMENT,
"unrecognised format specification %s", args[3]);
}
static grub_command_t cmd_addaddr, cmd_deladdr, cmd_addroute, cmd_delroute;
static grub_command_t cmd_lsroutes, cmd_lscards, cmd_getdhcp;
GRUB_MOD_INIT(net)
{
cmd_addaddr = grub_register_command ("net_add_addr", grub_cmd_addaddr,
"SHORTNAME CARD ADDRESS [HWADDRESS]",
N_("Add a network address."));
cmd_deladdr = grub_register_command ("net_del_addr", grub_cmd_deladdr,
"SHORTNAME",
N_("Delete a network address."));
cmd_addroute = grub_register_command ("net_add_route", grub_cmd_addroute,
"SHORTNAME NET [INTERFACE| gw GATEWAY]",
N_("Add a network route."));
cmd_delroute = grub_register_command ("net_del_route", grub_cmd_delroute,
"SHORTNAME",
N_("Delete a network route."));
cmd_lsroutes = grub_register_command ("net_ls_routes", grub_cmd_listroutes,
"", N_("list network routes"));
cmd_lscards = grub_register_command ("net_ls_cards", grub_cmd_listcards,
"", N_("list network cards"));
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."));
grub_net_open = grub_net_open_real;
grub_file_net_open = grub_net_file_open_real;
grub_file_net_read = grub_net_read_real;
grub_file_net_seek = grub_net_seek_real;
}
GRUB_MOD_FINI(net)
{
grub_unregister_command (cmd_addaddr);
grub_unregister_command (cmd_deladdr);
grub_unregister_command (cmd_addroute);
grub_unregister_command (cmd_delroute);
grub_unregister_command (cmd_lsroutes);
grub_unregister_command (cmd_lscards);
grub_unregister_command (cmd_getdhcp);
grub_net_open = NULL;
grub_file_net_read = NULL;
grub_file_net_open = NULL;
}
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