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udhcp: optional support for non-standard DHCP ports (+300 bytes when selected)

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This commit is contained in:
Denis Vlasenko 2008-02-04 13:12:16 +00:00
parent e8ef7ec7de
commit d55fe3e595
10 changed files with 79 additions and 14 deletions
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15
include/usage.h
View File

@ -3892,7 +3892,7 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
#define udhcpc_trivial_usage \
"[-Cfbnqtv] [-c CID] [-V VCLS] [-H HOSTNAME] [-i INTERFACE]\n" \
" [-p pidfile] [-r IP] [-s script] [-O dhcp-option]..."
" [-p pidfile] [-r IP] [-s script] [-O dhcp-option]..." USE_FEATURE_UDHCP_PORT(" [-P N]")
#define udhcpc_full_usage \
USE_GETOPT_LONG( \
" -V,--vendorclass=CLASSID Vendor class identifier" \
@ -3913,6 +3913,9 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
"\n -q,--quit Quit after obtaining lease" \
"\n -R,--release Release IP on quit" \
"\n -O,--request-option=OPT Request DHCP option OPT from server" \
USE_FEATURE_UDHCP_PORT( \
"\n -P,--client-port N Use port N instead of default 68" \
) \
USE_FEATURE_UDHCPC_ARPING( \
"\n -a,--arping Use arping to validate offered address" \
) \
@ -3936,18 +3939,24 @@ USE_FEATURE_RUN_PARTS_FANCY("\n -l Prints names of all matching files even when
"\n -q Quit after obtaining lease" \
"\n -R Release IP on quit" \
"\n -O OPT Request DHCP option OPT from server" \
USE_FEATURE_UDHCP_PORT( \
"\n -P N Use port N instead of default 68" \
) \
USE_FEATURE_UDHCPC_ARPING( \
"\n -a Use arping to validate offered address" \
) \
)
#define udhcpd_trivial_usage \
"[-fS] [configfile]" \
"[-fS]" USE_FEATURE_UDHCP_PORT(" [-P N]") " [configfile]" \
#define udhcpd_full_usage \
"DHCP server" \
"\n -f Run in foreground" \
"\n -S Log to syslog too"
"\n -S Log to syslog too" \
USE_FEATURE_UDHCP_PORT( \
"\n -P N Use port N instead of default 67" \
)
#define umount_trivial_usage \
"[flags] FILESYSTEM|DIRECTORY"

7
networking/udhcp/Config.in
View File

@ -63,6 +63,13 @@ config FEATURE_UDHCPC_ARPING
is really available. The client will DHCPDECLINE the offer if the
address is in use, and restart the discover process.
config FEATURE_UDHCP_PORT
bool "Enable '-P port' option for udhcpd and udhcpc"
default n
depends on APP_UDHCPD || APP_UDHCPC
help
At the cost of ~300 bytes, enables -P port option.
This feature is typically not needed.
config FEATURE_UDHCP_DEBUG
bool "Compile udhcp with noisy debugging messages"

8
networking/udhcp/clientsocket.c
View File

@ -33,8 +33,8 @@
#include <linux/filter.h>
#include "common.h"
#define SERVER_AND_CLIENT_PORTS ((SERVER_PORT << 16) + CLIENT_PORT)
#include "dhcpd.h"
#include "dhcpc.h"
int raw_socket(int ifindex)
{
@ -62,6 +62,7 @@ int raw_socket(int ifindex)
*
* TODO: make conditional?
*/
#define SERVER_AND_CLIENT_PORTS ((67 << 16) + 68)
static const struct sock_filter filter_instr[] = {
/* check for udp */
BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9),
@ -89,10 +90,13 @@ int raw_socket(int ifindex)
fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP));
DEBUG("got raw socket fd %d", fd);
if (SERVER_PORT == 67 && CLIENT_PORT == 68) {
/* Use only if standard ports are in use */
/* Ignoring error (kernel may lack support for this) */
if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog,
sizeof(filter_prog)) >= 0)
DEBUG("attached filter to raw socket fd %d", fd);
}
sock.sll_family = AF_PACKET;
sock.sll_protocol = htons(ETH_P_IP);

3
networking/udhcp/common.h
View File

@ -14,9 +14,6 @@
#define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"
#define SERVER_PORT 67
#define CLIENT_PORT 68
extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
/*** packet.h ***/

17
networking/udhcp/dhcpc.c
View File

@ -133,6 +133,7 @@ int udhcpc_main(int argc, char **argv)
{
uint8_t *temp, *message;
char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_A, *str_t;
USE_FEATURE_UDHCP_PORT(char *str_P;)
llist_t *list_O = NULL;
#if ENABLE_FEATURE_UDHCPC_ARPING
char *str_W;
@ -181,6 +182,7 @@ int udhcpc_main(int argc, char **argv)
OPT_a = 1 << 20,
OPT_W = 1 << 21,
#endif
OPT_P = 1 << 22,
};
#if ENABLE_GETOPT_LONG
static const char udhcpc_longopts[] ALIGN1 =
@ -207,9 +209,16 @@ int udhcpc_main(int argc, char **argv)
"arping\0" No_argument "a"
#endif
"request-option\0" Required_argument "O"
#if ENABLE_FEATURE_UDHCP_PORT
"client-port\0" Required_argument "P"
#endif
;
#endif
/* Default options. */
#if ENABLE_FEATURE_UDHCP_PORT
SERVER_PORT = 67;
CLIENT_PORT = 68;
#endif
client_config.interface = "eth0";
client_config.script = DEFAULT_SCRIPT;
@ -220,11 +229,13 @@ int udhcpc_main(int argc, char **argv)
#endif
opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vSA:"
USE_FEATURE_UDHCPC_ARPING("aW:")
USE_FEATURE_UDHCP_PORT("P:")
"O:"
, &str_c, &str_V, &str_h, &str_h, &str_F
, &client_config.interface, &client_config.pidfile, &str_r
, &client_config.script, &str_T, &str_t, &str_A
USE_FEATURE_UDHCPC_ARPING(, &str_W)
USE_FEATURE_UDHCP_PORT(, &str_P)
, &list_O
);
@ -276,6 +287,12 @@ int udhcpc_main(int argc, char **argv)
openlog(applet_name, LOG_PID, LOG_LOCAL0);
logmode |= LOGMODE_SYSLOG;
}
#if ENABLE_FEATURE_UDHCP_PORT
if (opt & OPT_P) {
CLIENT_PORT = xatou16(str_P);
SERVER_PORT = CLIENT_PORT - 1;
}
#endif
while (list_O) {
int n = index_in_strings(dhcp_option_strings, list_O->data);
if (n < 0)

10
networking/udhcp/dhcpc.h
View File

@ -29,11 +29,19 @@ struct client_config_t {
uint8_t *hostname; /* Optional hostname to use */
uint8_t *fqdn; /* Optional fully qualified domain name to use */
int ifindex; /* Index number of the interface to use */
uint16_t port;
uint8_t arp[6]; /* Our arp address */
uint8_t opt_mask[256 / 8]; /* Bitmask of options to send (-O option) */
};
#define client_config (*(struct client_config_t*)&bb_common_bufsiz1)
/* server_config sits in 1st half of bb_common_bufsiz1 */
#define client_config (*(struct client_config_t*)(&bb_common_bufsiz1[COMMON_BUFSIZE/2]))
#if ENABLE_FEATURE_UDHCP_PORT
#define CLIENT_PORT (client_config.port)
#else
#define CLIENT_PORT 68
#endif
/*** clientpacket.h ***/

16
networking/udhcp/dhcpd.c
View File

@ -12,6 +12,7 @@
#include <syslog.h>
#include "common.h"
#include "dhcpc.h"
#include "dhcpd.h"
#include "options.h"
@ -35,8 +36,14 @@ int udhcpd_main(int argc, char **argv)
unsigned opt;
struct option_set *option;
struct dhcpOfferedAddr *lease, static_lease;
USE_FEATURE_UDHCP_PORT(char *str_P;)
opt = getopt32(argv, "fS");
#if ENABLE_FEATURE_UDHCP_PORT
SERVER_PORT = 67;
CLIENT_PORT = 68;
#endif
opt = getopt32(argv, "fS" USE_FEATURE_UDHCP_PORT("P:", &str_P));
argv += optind;
if (!(opt & 1)) { /* no -f */
@ -48,7 +55,12 @@ int udhcpd_main(int argc, char **argv)
openlog(applet_name, LOG_PID, LOG_LOCAL0);
logmode |= LOGMODE_SYSLOG;
}
#if ENABLE_FEATURE_UDHCP_PORT
if (opt & 4) { /* -P */
SERVER_PORT = xatou16(str_P);
CLIENT_PORT = SERVER_PORT + 1;
}
#endif
/* Would rather not do read_config before daemonization -
* otherwise NOMMU machines will parse config twice */
read_config(argv[0] ? argv[0] : DHCPD_CONF_FILE);

9
networking/udhcp/dhcpd.h
View File

@ -1,5 +1,6 @@
/* vi: set sw=4 ts=4: */
/* dhcpd.h */
#ifndef _DHCPD_H
#define _DHCPD_H
@ -27,6 +28,7 @@ struct static_lease {
struct server_config_t {
uint32_t server; /* Our IP, in network order */
uint16_t port;
/* start,end are in host order: we need to compare start <= ip <= end */
uint32_t start_ip; /* Start address of leases, in host order */
uint32_t end_ip; /* End of leases, in host order */
@ -55,6 +57,13 @@ struct server_config_t {
};
#define server_config (*(struct server_config_t*)&bb_common_bufsiz1)
/* client_config sits in 2nd half of bb_common_bufsiz1 */
#if ENABLE_FEATURE_UDHCP_PORT
#define SERVER_PORT (server_config.port)
#else
#define SERVER_PORT 67
#endif
extern struct dhcpOfferedAddr *leases;

1
networking/udhcp/dhcprelay.c
View File

@ -14,6 +14,7 @@
#include "options.h"
/* constants */
#define SERVER_PORT 67
#define SELECT_TIMEOUT 5 /* select timeout in sec. */
#define MAX_LIFETIME 2*60 /* lifetime of an xid entry in sec. */

1
networking/udhcp/serverpacket.c
View File

@ -21,6 +21,7 @@
*/
#include "common.h"
#include "dhcpc.h"
#include "dhcpd.h"
#include "options.h"