mirror of
https://github.com/sheumann/hush.git
synced 2024-11-05 06:07:00 +00:00
4f3aa51f9d
function old new delta allocate_tempopt_if_needed - 76 +76 udhcp_str2optset 351 415 +64 attach_option 380 398 +18 len_of_option_as_string 11 12 +1 dhcp_option_lengths 11 12 +1 ------------------------------------------------------------------------------ (add/remove: 1/0 grow/shrink: 4/0 up/down: 160/0) Total: 160 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
299 lines
13 KiB
C
299 lines
13 KiB
C
/* vi: set sw=4 ts=4: */
|
|
/*
|
|
* Russ Dill <Russ.Dill@asu.edu> September 2001
|
|
* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
|
|
*
|
|
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
|
|
*/
|
|
#ifndef UDHCP_COMMON_H
|
|
#define UDHCP_COMMON_H 1
|
|
|
|
#include "libbb.h"
|
|
#include <netinet/udp.h>
|
|
#include <netinet/ip.h>
|
|
|
|
PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
|
|
|
|
extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
|
|
|
|
|
|
/*** DHCP packet ***/
|
|
|
|
/* DHCP protocol. See RFC 2131 */
|
|
#define DHCP_MAGIC 0x63825363
|
|
#define DHCP_OPTIONS_BUFSIZE 308
|
|
#define BOOTREQUEST 1
|
|
#define BOOTREPLY 2
|
|
|
|
//TODO: rename ciaddr/yiaddr/chaddr
|
|
struct dhcp_packet {
|
|
uint8_t op; /* BOOTREQUEST or BOOTREPLY */
|
|
uint8_t htype; /* hardware address type. 1 = 10mb ethernet */
|
|
uint8_t hlen; /* hardware address length */
|
|
uint8_t hops; /* used by relay agents only */
|
|
uint32_t xid; /* unique id */
|
|
uint16_t secs; /* elapsed since client began acquisition/renewal */
|
|
uint16_t flags; /* only one flag so far: */
|
|
#define BROADCAST_FLAG 0x8000 /* "I need broadcast replies" */
|
|
uint32_t ciaddr; /* client IP (if client is in BOUND, RENEW or REBINDING state) */
|
|
uint32_t yiaddr; /* 'your' (client) IP address */
|
|
/* IP address of next server to use in bootstrap, returned in DHCPOFFER, DHCPACK by server */
|
|
uint32_t siaddr_nip;
|
|
uint32_t gateway_nip; /* relay agent IP address */
|
|
uint8_t chaddr[16]; /* link-layer client hardware address (MAC) */
|
|
uint8_t sname[64]; /* server host name (ASCIZ) */
|
|
uint8_t file[128]; /* boot file name (ASCIZ) */
|
|
uint32_t cookie; /* fixed first four option bytes (99,130,83,99 dec) */
|
|
uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
|
|
} PACKED;
|
|
#define DHCP_PKT_SNAME_LEN 64
|
|
#define DHCP_PKT_FILE_LEN 128
|
|
#define DHCP_PKT_SNAME_LEN_STR "64"
|
|
#define DHCP_PKT_FILE_LEN_STR "128"
|
|
|
|
struct ip_udp_dhcp_packet {
|
|
struct iphdr ip;
|
|
struct udphdr udp;
|
|
struct dhcp_packet data;
|
|
} PACKED;
|
|
|
|
/* Let's see whether compiler understood us right */
|
|
struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
|
|
char BUG_bad_sizeof_struct_ip_udp_dhcp_packet
|
|
[(sizeof(struct ip_udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
|
|
};
|
|
|
|
|
|
/*** Options ***/
|
|
|
|
enum {
|
|
OPTION_IP = 1,
|
|
OPTION_IP_PAIR,
|
|
OPTION_STRING,
|
|
// OPTION_BOOLEAN,
|
|
OPTION_U8,
|
|
OPTION_U16,
|
|
// OPTION_S16,
|
|
OPTION_U32,
|
|
OPTION_S32,
|
|
OPTION_BIN,
|
|
OPTION_STATIC_ROUTES,
|
|
#if ENABLE_FEATURE_UDHCP_RFC3397
|
|
OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
|
|
OPTION_SIP_SERVERS,
|
|
#endif
|
|
|
|
OPTION_TYPE_MASK = 0x0f,
|
|
/* Client requests this option by default */
|
|
OPTION_REQ = 0x10,
|
|
/* There can be a list of 1 or more of these */
|
|
OPTION_LIST = 0x20,
|
|
};
|
|
|
|
/* DHCP option codes (partial list). See RFC 2132 and
|
|
* http://www.iana.org/assignments/bootp-dhcp-parameters/
|
|
* Commented out options are handled by common option machinery,
|
|
* uncommented ones have spacial cases (grep for them to see).
|
|
*/
|
|
#define DHCP_PADDING 0x00
|
|
#define DHCP_SUBNET 0x01
|
|
//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */
|
|
//#define DHCP_ROUTER 0x03
|
|
//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
|
|
//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
|
|
//#define DHCP_DNS_SERVER 0x06
|
|
//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
|
|
//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
|
|
//#define DHCP_LPR_SERVER 0x09
|
|
#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */
|
|
//#define DHCP_BOOT_SIZE 0x0d
|
|
//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */
|
|
//#define DHCP_SWAP_SERVER 0x10
|
|
//#define DHCP_ROOT_PATH 0x11
|
|
//#define DHCP_IP_TTL 0x17
|
|
//#define DHCP_MTU 0x1a
|
|
//#define DHCP_BROADCAST 0x1c
|
|
//#define DHCP_NIS_DOMAIN 0x28
|
|
//#define DHCP_NIS_SERVER 0x29
|
|
//#define DHCP_NTP_SERVER 0x2a
|
|
//#define DHCP_WINS_SERVER 0x2c
|
|
#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */
|
|
#define DHCP_LEASE_TIME 0x33
|
|
#define DHCP_OPTION_OVERLOAD 0x34
|
|
#define DHCP_MESSAGE_TYPE 0x35
|
|
#define DHCP_SERVER_ID 0x36 /* by default server's IP */
|
|
#define DHCP_PARAM_REQ 0x37 /* list of options client wants */
|
|
//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */
|
|
#define DHCP_MAX_SIZE 0x39
|
|
#define DHCP_VENDOR 0x3c /* client's vendor (a string) */
|
|
#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */
|
|
//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */
|
|
//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */
|
|
//#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */
|
|
#define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */
|
|
//#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */
|
|
//#define DHCP_SIP_SERVERS 0x78 /* RFC 3361. flag byte, then: 0: domain names, 1: IP addrs */
|
|
//#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */
|
|
//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
|
|
#define DHCP_END 0xff
|
|
|
|
/* Offsets in option byte sequence */
|
|
#define OPT_CODE 0
|
|
#define OPT_LEN 1
|
|
#define OPT_DATA 2
|
|
/* Bits in "overload" option */
|
|
#define OPTION_FIELD 0
|
|
#define FILE_FIELD 1
|
|
#define SNAME_FIELD 2
|
|
|
|
/* DHCP_MESSAGE_TYPE values */
|
|
#define DHCPDISCOVER 1 /* client -> server */
|
|
#define DHCPOFFER 2 /* client <- server */
|
|
#define DHCPREQUEST 3 /* client -> server */
|
|
#define DHCPDECLINE 4 /* client -> server */
|
|
#define DHCPACK 5 /* client <- server */
|
|
#define DHCPNAK 6 /* client <- server */
|
|
#define DHCPRELEASE 7 /* client -> server */
|
|
#define DHCPINFORM 8 /* client -> server */
|
|
#define DHCP_MINTYPE DHCPDISCOVER
|
|
#define DHCP_MAXTYPE DHCPINFORM
|
|
|
|
struct dhcp_optflag {
|
|
uint8_t flags;
|
|
uint8_t code;
|
|
};
|
|
|
|
struct option_set {
|
|
uint8_t *data;
|
|
struct option_set *next;
|
|
};
|
|
|
|
extern const struct dhcp_optflag dhcp_optflags[];
|
|
extern const char dhcp_option_strings[];
|
|
extern const uint8_t dhcp_option_lengths[];
|
|
|
|
unsigned FAST_FUNC udhcp_option_idx(const char *name);
|
|
|
|
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(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 *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC;
|
|
|
|
|
|
// RFC 2131 Table 5: Fields and options used by DHCP clients
|
|
//
|
|
// Fields 'hops', 'yiaddr', 'siaddr', 'giaddr' are always zero
|
|
//
|
|
// Field DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE
|
|
// ----- ------------ ------------ ----------- ----------- -----------
|
|
// 'xid' selected by client selected by client 'xid' from server selected by client selected by client
|
|
// DHCPOFFER message
|
|
// 'secs' 0 or seconds since 0 or seconds since 0 or seconds since 0 0
|
|
// DHCP process started DHCP process started DHCP process started
|
|
// 'flags' Set 'BROADCAST' Set 'BROADCAST' Set 'BROADCAST' 0 0
|
|
// flag if client flag if client flag if client
|
|
// requires broadcast requires broadcast requires broadcast
|
|
// reply reply reply
|
|
// 'ciaddr' 0 client's IP 0 or client's IP 0 client's IP
|
|
// (BOUND/RENEW/REBIND)
|
|
// 'chaddr' client's MAC client's MAC client's MAC client's MAC client's MAC
|
|
// 'sname' options or sname options or sname options or sname (unused) (unused)
|
|
// 'file' options or file options or file options or file (unused) (unused)
|
|
// 'options' options options options message type opt message type opt
|
|
//
|
|
// Option DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE
|
|
// ------ ------------ ---------- ----------- ----------- -----------
|
|
// Requested IP address MAY MUST NOT MUST (in MUST MUST NOT
|
|
// SELECTING or
|
|
// INIT-REBOOT)
|
|
// MUST NOT (in
|
|
// BOUND or
|
|
// RENEWING)
|
|
// IP address lease time MAY MUST NOT MAY MUST NOT MUST NOT
|
|
// Use 'file'/'sname' fields MAY MAY MAY MAY MAY
|
|
// Client identifier MAY MAY MAY MAY MAY
|
|
// Vendor class identifier MAY MAY MAY MUST NOT MUST NOT
|
|
// Server identifier MUST NOT MUST NOT MUST (after MUST MUST
|
|
// SELECTING)
|
|
// MUST NOT (after
|
|
// INIT-REBOOT,
|
|
// BOUND, RENEWING
|
|
// or REBINDING)
|
|
// Parameter request list MAY MAY MAY MUST NOT MUST NOT
|
|
// Maximum message size MAY MAY MAY MUST NOT MUST NOT
|
|
// Message SHOULD NOT SHOULD NOT SHOULD NOT SHOULD SHOULD
|
|
// Site-specific MAY MAY MAY MUST NOT MUST NOT
|
|
// All others MAY MAY MAY MUST NOT MUST NOT
|
|
|
|
|
|
/*** Logging ***/
|
|
|
|
#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
|
|
extern unsigned dhcp_verbose;
|
|
# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
|
|
# if CONFIG_UDHCP_DEBUG >= 2
|
|
void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
|
|
# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
|
|
# else
|
|
# define udhcp_dump_packet(...) ((void)0)
|
|
# define log2(...) ((void)0)
|
|
# endif
|
|
# if CONFIG_UDHCP_DEBUG >= 3
|
|
# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
|
|
# else
|
|
# define log3(...) ((void)0)
|
|
# endif
|
|
#else
|
|
# define udhcp_dump_packet(...) ((void)0)
|
|
# define log1(...) ((void)0)
|
|
# define log2(...) ((void)0)
|
|
# define log3(...) ((void)0)
|
|
#endif
|
|
|
|
|
|
/*** Other shared functions ***/
|
|
|
|
/* 2nd param is "uint32_t*" */
|
|
int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
|
|
/* 2nd param is "struct option_set**" */
|
|
int FAST_FUNC udhcp_str2optset(const char *str, void *arg);
|
|
|
|
uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
|
|
|
|
void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
|
|
|
|
int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
|
|
|
|
int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
|
|
uint32_t source_ip, int source_port,
|
|
uint32_t dest_ip, int dest_port, const uint8_t *dest_arp,
|
|
int ifindex) FAST_FUNC;
|
|
|
|
int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
|
|
uint32_t source_ip, int source_port,
|
|
uint32_t dest_ip, int dest_port) FAST_FUNC;
|
|
|
|
void udhcp_sp_setup(void) FAST_FUNC;
|
|
int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
|
|
int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
|
|
|
|
int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
|
|
|
|
int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
|
|
|
|
/* Returns 1 if no reply received */
|
|
int arpping(uint32_t test_nip,
|
|
const uint8_t *safe_mac,
|
|
uint32_t from_ip,
|
|
uint8_t *from_mac,
|
|
const char *interface) FAST_FUNC;
|
|
|
|
POP_SAVED_FUNCTION_VISIBILITY
|
|
|
|
#endif
|