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udhcp: pass pointer to whole packet to "add option" functions

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This is needed for "overflow option" support

function                                             old     new   delta
udhcp_find_option                                      -      34     +34
udhcp_add_binary_option                               94     106     +12
write_leases                                         227     223      -4
udhcp_init_header                                     86      82      -4
send_release                                         104      99      -5
init_packet                                           87      81      -6
add_client_options                                   160     154      -6
add_server_options                                   100      92      -8
udhcpd_main                                         1964    1954     -10
udhcpc_main                                         2859    2837     -22
find_option                                           34       -     -34
------------------------------------------------------------------------------
(add/remove: 1/1 grow/shrink: 1/8 up/down: 46/-99)            Total: -53 bytes

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
This commit is contained in:
Denys Vlasenko 2010-03-26 09:32:09 +01:00
parent a8f6b99987
commit 7724c766bd
8 changed files with 37 additions and 34 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

16
networking/udhcp/common.c
View File

@ -226,14 +226,16 @@ int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
/* Add an option (supplied in binary form) to the options.
* Option format: [code][len][data1][data2]..[dataLEN]
*/
void FAST_FUNC udhcp_add_binary_option(uint8_t *optionptr, uint8_t *addopt)
void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
{
unsigned len;
uint8_t *optionptr = packet->options;
unsigned end = udhcp_end_option(optionptr);
/* end position + option code/length + addopt length + end option */
len = OPT_DATA + addopt[OPT_LEN];
/* end position + (option code/length + addopt length) + end option */
if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
//TODO: learn how to use overflow option if we exhaust packet->options[]
bb_error_msg("option 0x%02x did not fit into the packet",
addopt[OPT_CODE]);
return;
@ -243,8 +245,8 @@ void FAST_FUNC udhcp_add_binary_option(uint8_t *optionptr, uint8_t *addopt)
optionptr[end + len] = DHCP_END;
}
/* Add a one to four byte option to a packet */
void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
/* Add an one to four byte option to a packet */
void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
{
const struct dhcp_option *dh;
@ -259,7 +261,7 @@ void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_
data <<= 8 * (4 - len);
/* Assignment is unaligned! */
move_to_unaligned32(&option[OPT_DATA], data);
udhcp_add_binary_option(optionptr, option);
udhcp_add_binary_option(packet, option);
return;
}
}
@ -268,7 +270,7 @@ void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_
}
/* Find option 'code' in opt_list */
struct option_set* FAST_FUNC find_option(struct option_set *opt_list, uint8_t code)
struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
{
while (opt_list && opt_list->data[OPT_CODE] < code)
opt_list = opt_list->next;
@ -307,7 +309,7 @@ static NOINLINE void attach_option(
char *allocated = NULL;
#endif
existing = find_option(*opt_list, option->code);
existing = udhcp_find_option(*opt_list, option->code);
if (!existing) {
log2("Attaching option %02x to list", option->code);
#if ENABLE_FEATURE_UDHCP_RFC3397

6
networking/udhcp/common.h
View File

@ -172,13 +172,13 @@ extern const uint8_t dhcp_option_lengths[];
uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
void udhcp_add_binary_option(uint8_t *optionptr, uint8_t *addopt) FAST_FUNC;
void udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
#if ENABLE_FEATURE_UDHCP_RFC3397
char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
#endif
struct option_set *find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
// RFC 2131 Table 5: Fields and options used by DHCP clients

26
networking/udhcp/dhcpc.c
View File

@ -319,22 +319,22 @@ static void init_packet(struct dhcp_packet *packet, char type)
udhcp_init_header(packet, type);
memcpy(packet->chaddr, client_config.client_mac, 6);
if (client_config.clientid)
udhcp_add_binary_option(packet->options, client_config.clientid);
udhcp_add_binary_option(packet, client_config.clientid);
if (client_config.hostname)
udhcp_add_binary_option(packet->options, client_config.hostname);
udhcp_add_binary_option(packet, client_config.hostname);
if (client_config.fqdn)
udhcp_add_binary_option(packet->options, client_config.fqdn);
udhcp_add_binary_option(packet, client_config.fqdn);
if (type != DHCPDECLINE
&& type != DHCPRELEASE
&& client_config.vendorclass
) {
udhcp_add_binary_option(packet->options, client_config.vendorclass);
udhcp_add_binary_option(packet, client_config.vendorclass);
}
}
static void add_client_options(struct dhcp_packet *packet)
{
/* Add am "param req" option with the list of options we'd like to have
/* Add a "param req" option with the list of options we'd like to have
* from stubborn DHCP servers. Pull the data from the struct in common.c.
* No bounds checking because it goes towards the head of the packet. */
uint8_t c;
@ -361,7 +361,7 @@ static void add_client_options(struct dhcp_packet *packet)
{
struct option_set *curr = client_config.options;
while (curr) {
udhcp_add_binary_option(packet->options, curr->data);
udhcp_add_binary_option(packet, curr->data);
curr = curr->next;
}
// if (client_config.sname)
@ -405,10 +405,10 @@ static int send_discover(uint32_t xid, uint32_t requested)
init_packet(&packet, DHCPDISCOVER);
packet.xid = xid;
if (requested)
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
/* Explicitly saying that we want RFC-compliant packets helps
* some buggy DHCP servers to NOT send bigger packets */
udhcp_add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576));
udhcp_add_simple_option(&packet, DHCP_MAX_SIZE, htons(576));
add_client_options(&packet);
bb_info_msg("Sending discover...");
@ -426,8 +426,8 @@ static int send_select(uint32_t xid, uint32_t server, uint32_t requested)
init_packet(&packet, DHCPREQUEST);
packet.xid = xid;
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
add_client_options(&packet);
addr.s_addr = requested;
@ -461,8 +461,8 @@ static int send_decline(uint32_t xid, uint32_t server, uint32_t requested)
init_packet(&packet, DHCPDECLINE);
packet.xid = xid;
udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested);
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
bb_info_msg("Sending decline...");
return raw_bcast_from_client_config_ifindex(&packet);
@ -478,7 +478,7 @@ static int send_release(uint32_t server, uint32_t ciaddr)
packet.xid = random_xid();
packet.ciaddr = ciaddr;
udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server);
udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server);
bb_info_msg("Sending release...");
return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT);

10
networking/udhcp/dhcpd.c
View File

@ -93,7 +93,7 @@ static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacke
packet->flags = oldpacket->flags;
packet->gateway_nip = oldpacket->gateway_nip;
packet->ciaddr = oldpacket->ciaddr;
udhcp_add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip);
udhcp_add_simple_option(packet, DHCP_SERVER_ID, server_config.server_nip);
}
/* Fill options field, siaddr_nip, and sname and boot_file fields.
@ -105,7 +105,7 @@ static void add_server_options(struct dhcp_packet *packet)
while (curr) {
if (curr->data[OPT_CODE] != DHCP_LEASE_TIME)
udhcp_add_binary_option(packet->options, curr->data);
udhcp_add_binary_option(packet, curr->data);
curr = curr->next;
}
@ -194,7 +194,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip,
}
lease_time_sec = select_lease_time(oldpacket);
udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
udhcp_add_simple_option(&packet, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
addr.s_addr = packet.yiaddr;
@ -224,7 +224,7 @@ static void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr)
packet.yiaddr = yiaddr;
lease_time_sec = select_lease_time(oldpacket);
udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec));
udhcp_add_simple_option(&packet, DHCP_LEASE_TIME, htonl(lease_time_sec));
add_server_options(&packet);
@ -324,7 +324,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv)
bb_info_msg("%s (v"BB_VER") started", applet_name);
option = find_option(server_config.options, DHCP_LEASE_TIME);
option = udhcp_find_option(server_config.options, DHCP_LEASE_TIME);
server_config.max_lease_sec = DEFAULT_LEASE_TIME;
if (option) {
move_from_unaligned32(server_config.max_lease_sec, option->data + OPT_DATA);

9
networking/udhcp/files.c
View File

@ -167,10 +167,11 @@ void FAST_FUNC write_leases(void)
close(fd);
if (server_config.notify_file) {
// TODO: vfork-based child creation
char *cmd = xasprintf("%s %s", server_config.notify_file, server_config.lease_file);
system(cmd);
free(cmd);
char *argv[3];
argv[0] = server_config.notify_file;
argv[1] = server_config.lease_file;
argv[2] = NULL;
spawn_and_wait(argv);
}
}

1
networking/udhcp/leases.c
View File

@ -163,6 +163,7 @@ uint32_t FAST_FUNC find_free_or_expired_nip(const uint8_t *safe_mac)
lease = find_lease_by_nip(nip);
if (!lease) {
//TODO: DHCP servers do not always sit on the same subnet as clients: should *ping*, not arp-ping!
if (nobody_responds_to_arp(nip, safe_mac))
return nip;
} else {

2
networking/udhcp/packet.c
View File

@ -33,7 +33,7 @@ void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type)
packet->cookie = htonl(DHCP_MAGIC);
if (DHCP_END != 0)
packet->options[0] = DHCP_END;
udhcp_add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type);
udhcp_add_simple_option(packet, DHCP_MESSAGE_TYPE, type);
}
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2

1
networking/udhcp/socket.c
View File

@ -24,7 +24,6 @@
*/
#include <net/if.h>
//#include <features.h>
#if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined _NEWLIB_VERSION
#include <netpacket/packet.h>
#include <net/ethernet.h>