c7dc79e71d
Also fixes attacks possible via DHCPDECLINE / DHCPRELEASE function old new delta udhcpd_main 1846 1949 +103 send_renew 105 142 +37 send_NAK 61 - -61 send_ACK 180 - -180 ------------------------------------------------------------------------------ (add/remove: 0/2 grow/shrink: 2/0 up/down: 140/-241) Total: -101 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
120 lines
4.6 KiB
C
120 lines
4.6 KiB
C
/* vi: set sw=4 ts=4: */
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/* options.h */
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#ifndef UDHCP_OPTIONS_H
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#define UDHCP_OPTIONS_H 1
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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enum {
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OPTION_IP = 1,
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OPTION_IP_PAIR,
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OPTION_STRING,
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#if ENABLE_FEATURE_UDHCP_RFC3397
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OPTION_STR1035, /* RFC1035 compressed domain name list */
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#endif
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OPTION_BOOLEAN,
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OPTION_U8,
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OPTION_U16,
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OPTION_S16,
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OPTION_U32,
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OPTION_S32,
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OPTION_STATIC_ROUTES,
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OPTION_TYPE_MASK = 0x0f,
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/* Client requests this option by default */
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OPTION_REQ = 0x10,
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/* There can be a list of 1 or more of these */
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OPTION_LIST = 0x20,
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};
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/* DHCP option codes (partial list). See RFC 2132 and
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* http://www.iana.org/assignments/bootp-dhcp-parameters/
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* Commented out options are handled by common option machinery,
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* uncommented ones have spacial cases (grep for them to see).
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*/
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#define DHCP_PADDING 0x00
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#define DHCP_SUBNET 0x01
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//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */
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//#define DHCP_ROUTER 0x03
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//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */
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//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */
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//#define DHCP_DNS_SERVER 0x06
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//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog)
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//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */
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//#define DHCP_LPR_SERVER 0x09
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#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */
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//#define DHCP_BOOT_SIZE 0x0d
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//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */
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//#define DHCP_SWAP_SERVER 0x10
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//#define DHCP_ROOT_PATH 0x11
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//#define DHCP_IP_TTL 0x17
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//#define DHCP_MTU 0x1a
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//#define DHCP_BROADCAST 0x1c
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//#define DHCP_NIS_DOMAIN 0x28
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//#define DHCP_NIS_SERVER 0x29
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//#define DHCP_NTP_SERVER 0x2a
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//#define DHCP_WINS_SERVER 0x2c
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#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */
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#define DHCP_LEASE_TIME 0x33
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#define DHCP_OPTION_OVERLOAD 0x34
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#define DHCP_MESSAGE_TYPE 0x35
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#define DHCP_SERVER_ID 0x36 /* by default server's IP */
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#define DHCP_PARAM_REQ 0x37 /* list of options client wants */
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//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */
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#define DHCP_MAX_SIZE 0x39
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#define DHCP_VENDOR 0x3c /* client's vendor (a string) */
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#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */
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//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */
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//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */
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//#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */
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#define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */
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//#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */
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//#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */
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//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */
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#define DHCP_END 0xff
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/* Offsets in option byte sequence */
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#define OPT_CODE 0
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#define OPT_LEN 1
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#define OPT_DATA 2
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/* Bits in "overload" option */
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#define OPTION_FIELD 0
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#define FILE_FIELD 1
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#define SNAME_FIELD 2
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/* DHCP_MESSAGE_TYPE values */
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#define DHCPDISCOVER 1 /* client -> server */
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#define DHCPOFFER 2 /* client <- server */
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#define DHCPREQUEST 3 /* client -> server */
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#define DHCPDECLINE 4 /* client -> server */
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#define DHCPACK 5 /* client <- server */
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#define DHCPNAK 6 /* client <- server */
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#define DHCPRELEASE 7 /* client -> server */
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#define DHCPINFORM 8 /* client -> server */
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#define DHCP_MINTYPE DHCPDISCOVER
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#define DHCP_MAXTYPE DHCPINFORM
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struct dhcp_option {
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uint8_t flags;
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uint8_t code;
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};
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extern const struct dhcp_option dhcp_options[];
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extern const char dhcp_option_strings[];
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extern const uint8_t dhcp_option_lengths[];
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uint8_t *get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
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int end_option(uint8_t *optionptr) FAST_FUNC;
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void add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC;
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void add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC;
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#if ENABLE_FEATURE_UDHCP_RFC3397
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char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC;
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uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC;
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#endif
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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