392 lines
17 KiB
C
392 lines
17 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Russ Dill <Russ.Dill@asu.edu> September 2001
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* Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003
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*
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* Licensed under GPLv2 or later, see file LICENSE in this source tree.
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*/
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#ifndef UDHCP_COMMON_H
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#define UDHCP_COMMON_H 1
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#include "libbb.h"
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#include "common_bufsiz.h"
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#include <netinet/udp.h>
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#include <netinet/ip.h>
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PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN
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extern const uint8_t MAC_BCAST_ADDR[6] ALIGN2; /* six all-ones */
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/*** DHCP packet ***/
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/* DHCP protocol. See RFC 2131 */
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#define DHCP_MAGIC 0x63825363
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#define DHCP_OPTIONS_BUFSIZE 308
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#define BOOTREQUEST 1
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#define BOOTREPLY 2
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//TODO: rename ciaddr/yiaddr/chaddr
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struct dhcp_packet {
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uint8_t op; /* BOOTREQUEST or BOOTREPLY */
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uint8_t htype; /* hardware address type. 1 = 10mb ethernet */
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uint8_t hlen; /* hardware address length */
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uint8_t hops; /* used by relay agents only */
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uint32_t xid; /* unique id */
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uint16_t secs; /* elapsed since client began acquisition/renewal */
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uint16_t flags; /* only one flag so far: */
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#define BROADCAST_FLAG 0x8000 /* "I need broadcast replies" */
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uint32_t ciaddr; /* client IP (if client is in BOUND, RENEW or REBINDING state) */
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uint32_t yiaddr; /* 'your' (client) IP address */
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/* IP address of "next server" (usually meant to be an TFTP server)
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* to use in bootstrap, returned in DHCPOFFER, DHCPACK by server: */
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uint32_t siaddr_nip;
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/* RFC 951 (BOOTP): "place my (server) IP address in the 'siaddr' field"
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* (IOW: unconditionally, not just if we are also a TFTP server).
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* DHCP servers don't have to do this, they add SERVER_ID option
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* to their reply packets to let client identify lease-giving server.
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*/
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uint32_t gateway_nip; /* aka 'giaddr': relay agent IP address, else 0 */
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uint8_t chaddr[16]; /* link-layer client hardware address (MAC) */
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uint8_t sname[64]; /* server host name (ASCIZ) */
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/* RFC 951 (BOOTP): "If the client wishes to restrict booting
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* to a particular server name, it may place [it] in 'sname'"
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*/
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uint8_t file[128]; /* boot file name (ASCIZ) */
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/* RFC 951 (BOOTP): in client requests, "...can be a 'generic' name
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* such as 'unix' or 'gateway'; this means 'boot the named program
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* configured for my machine'"
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*/
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/* BOOTP fields end here, BOOTP says optional uint8_t vend[64] follows */
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uint32_t cookie; /* DHCP magic bytes: 99,130,83,99 decimal */
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uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
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};
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#define DHCP_PKT_SNAME_LEN 64
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#define DHCP_PKT_FILE_LEN 128
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#define DHCP_PKT_SNAME_LEN_STR "64"
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#define DHCP_PKT_FILE_LEN_STR "128"
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struct ip_udp_dhcp_packet {
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struct iphdr ip;
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struct udphdr udp;
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struct dhcp_packet data;
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};
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struct udp_dhcp_packet {
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struct udphdr udp;
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struct dhcp_packet data;
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};
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enum {
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IP_UDP_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
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UDP_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
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DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS,
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};
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/* Let's see whether compiler understood us right */
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struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet {
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char c[IP_UDP_DHCP_SIZE == 576 ? 1 : -1];
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};
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/*** Options ***/
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enum {
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OPTION_IP = 0,
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OPTION_IP_PAIR,
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OPTION_STRING,
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/* Opts of STRING_HOST type will be sanitized before they are passed
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* to udhcpc script's environment: */
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OPTION_STRING_HOST,
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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_BIN,
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OPTION_STATIC_ROUTES,
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OPTION_6RD,
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#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
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OPTION_DNS_STRING, /* RFC1035 compressed domain name list */
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#endif
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#if ENABLE_FEATURE_UDHCP_RFC3397
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OPTION_SIP_SERVERS,
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#endif
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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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struct dhcp_scan_state {
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int overload;
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int rem;
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uint8_t *optionptr;
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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 special 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 /* 12: 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 /* 15: 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_ROUTES 0x21
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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 /* 50: sent by client if specific IP is wanted */
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#define DHCP_LEASE_TIME 0x33 /* 51: 32bit big-endian */
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#define DHCP_OPTION_OVERLOAD 0x34 /* 52: 1 byte */
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#define DHCP_MESSAGE_TYPE 0x35 /* 53: 1 byte */
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#define DHCP_SERVER_ID 0x36 /* 54: server's IP */
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#define DHCP_PARAM_REQ 0x37 /* 55: list of options client wants */
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//#define DHCP_ERR_MESSAGE 0x38 /* 56: error message when sending NAK etc */
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#define DHCP_MAX_SIZE 0x39 /* 57: 16bit big-endian */
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// 0x3a /* 58: from server: renew time, 32bit big-endian */
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// 0x3b /* 59: from server: rebind time, 32bit big-endian */
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#define DHCP_VENDOR 0x3c /* 60: client's vendor (a string) */
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#define DHCP_CLIENT_ID 0x3d /* 61: by default client's MAC addr, but may be arbitrarily long */
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//#define DHCP_TFTP_SERVER_NAME 0x42 /* 66: same as 'sname' field */
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//#define DHCP_BOOT_FILE 0x43 /* 67: same as 'file' field */
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//#define DHCP_USER_CLASS 0x4d /* 77: RFC 3004. set of LASCII strings. "I am a printer" etc */
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// 0x50 /* 80: rapid commit ("I'm ok with getting immediate ACK, not just OFFER"), 0 bytes */
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#define DHCP_FQDN 0x51 /* 81: client asks to update DNS to map its FQDN to its new IP */
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//#define DHCP_PCODE 0x64 /* 100: RFC 4833. IEEE 1003.1 TZ string */
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//#define DHCP_TCODE 0x65 /* 101: RFC 4833. Reference to the TZ database string */
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//#define DHCP_DOMAIN_SEARCH 0x77 /* 119: RFC 3397. set of ASCIZ string, DNS-style compressed */
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//#define DHCP_SIP_SERVERS 0x78 /* 120: RFC 3361. flag byte, then: 0: domain names, 1: IP addrs */
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//#define DHCP_STATIC_ROUTES 0x79 /* 121: RFC 3442. (mask,ip,router) tuples */
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//#define DHCP_VLAN_ID 0x84 /* 132: 802.1P VLAN ID */
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//#define DHCP_VLAN_PRIORITY 0x85 /* 133: 802.1Q VLAN priority */
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//#define DHCP_PXE_CONF_FILE 0xd1 /* 209: RFC 5071 Configuration file */
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//#define DHCP_PXE_PATH_PREFIX 0xd2 /* 210: RFC 5071 Path prefix */
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//#define DHCP_REBOOT_TIME 0xd3 /* 211: RFC 5071 Reboot time */
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//#define DHCP_MS_STATIC_ROUTES 0xf9 /* 249: Microsoft's pre-RFC 3442 code for 0x79? */
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//#define DHCP_WPAD 0xfc /* 252: MSIE's Web Proxy Autodiscovery Protocol */
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#define DHCP_END 0xff /* 255: */
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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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/* Offsets in option byte sequence for DHCPv6 */
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#define D6_OPT_CODE 0
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#define D6_OPT_LEN 2
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#define D6_OPT_DATA 4
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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_optflag {
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uint8_t flags;
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uint8_t code;
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};
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struct option_set {
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uint8_t *data;
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struct option_set *next;
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};
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#if ENABLE_UDHCPC || ENABLE_UDHCPD
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extern const struct dhcp_optflag dhcp_optflags[];
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extern const char dhcp_option_strings[] ALIGN1;
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#endif
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extern const uint8_t dhcp_option_lengths[] ALIGN1;
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unsigned FAST_FUNC udhcp_option_idx(const char *name, const char *option_strings);
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void init_scan_state(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
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uint8_t *udhcp_scan_options(struct dhcp_packet *packet, struct dhcp_scan_state *scan_state) FAST_FUNC;
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uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC;
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/* Same as above + ensures that option length is 4 bytes
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* (returns NULL if size is different)
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*/
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uint8_t *udhcp_get_option32(struct dhcp_packet *packet, int code) FAST_FUNC;
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int udhcp_end_option(uint8_t *optionptr) FAST_FUNC;
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void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC;
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#if ENABLE_UDHCPC || ENABLE_UDHCPD
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void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC;
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#endif
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#if ENABLE_FEATURE_UDHCP_RFC3397 || ENABLE_FEATURE_UDHCPC6_RFC3646 || ENABLE_FEATURE_UDHCPC6_RFC4704
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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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#if !ENABLE_UDHCPC6
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#define udhcp_find_option(opt_list, code, dhcpv6) \
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udhcp_find_option(opt_list, code)
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#endif
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struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code, bool dhcpv6) FAST_FUNC;
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// RFC 2131 Table 5: Fields and options used by DHCP clients
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//
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// Fields 'hops', 'yiaddr', 'siaddr', 'giaddr' are always zero, 'chaddr' is always client's MAC
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//
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// Field DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE
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// ----- ------------ ------------ ----------- ----------- -----------
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// 'xid' selected by client selected by client 'xid' from server selected by client selected by client
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// DHCPOFFER message
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// 'secs' 0 or seconds since 0 or seconds since 0 or seconds since 0 0
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// DHCP process started DHCP process started DHCP process started
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// 'flags' Set 'BROADCAST' Set 'BROADCAST' Set 'BROADCAST' 0 0
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// flag if client needs flag if client needs flag if client needs
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// broadcast reply broadcast reply broadcast reply
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// 'ciaddr' 0 client's IP 0 or client's IP 0 client's IP
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// (BOUND/RENEW/REBIND)
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// 'sname' options or sname options or sname options or sname (unused) (unused)
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// 'file' options or file options or file options or file (unused) (unused)
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// 'options' options options options message type opt message type opt
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//
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// Option DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE
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// ------ ------------ ---------- ----------- ----------- -----------
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// Requested IP address MAY MUST NOT MUST (in SELECTING MUST MUST NOT
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// or INIT-REBOOT)
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// MUST NOT (in BOUND
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// or RENEWING)
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// IP address lease time MAY MUST NOT MAY MUST NOT MUST NOT
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// Use 'file'/'sname' fields MAY MAY MAY MAY MAY
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// Client identifier MAY MAY MAY MAY MAY
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// Vendor class identifier MAY MAY MAY MUST NOT MUST NOT
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// Server identifier MUST NOT MUST NOT MUST (after SELECTING) MUST MUST
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// MUST NOT (after
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// INIT-REBOOT, BOUND,
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// RENEWING or REBINDING)
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// Parameter request list MAY MAY MAY MUST NOT MUST NOT
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// Maximum message size MAY MAY MAY MUST NOT MUST NOT
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// Message SHOULD NOT SHOULD NOT SHOULD NOT SHOULD SHOULD
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// Site-specific MAY MAY MAY MUST NOT MUST NOT
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// All others MAY MAY MAY MUST NOT MUST NOT
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/*** Logging ***/
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
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# define IF_UDHCP_VERBOSE(...) __VA_ARGS__
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extern unsigned dhcp_verbose;
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# define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0)
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//# define log1s(msg) do { if (dhcp_verbose >= 1) bb_simple_info_msg(msg); } while (0)
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void log1s(const char *msg) FAST_FUNC;
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# if CONFIG_UDHCP_DEBUG >= 2
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void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC;
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# define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0)
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# define log2s(msg) do { if (dhcp_verbose >= 2) bb_simple_info_msg(msg); } while (0)
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# else
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# define udhcp_dump_packet(...) ((void)0)
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# define log2(...) ((void)0)
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# define log2s(msg) ((void)0)
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# endif
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# if CONFIG_UDHCP_DEBUG >= 3
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# define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0)
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# define log3s(msg) do { if (dhcp_verbose >= 3) bb_simple_info_msg(msg); } while (0)
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# else
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# define log3(...) ((void)0)
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# define log3s(msg) ((void)0)
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# endif
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#else
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# define IF_UDHCP_VERBOSE(...)
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# define udhcp_dump_packet(...) ((void)0)
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# define log1(...) ((void)0)
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# define log1s(msg) ((void)0)
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# define log2(...) ((void)0)
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# define log2s(msg) ((void)0)
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# define log3(...) ((void)0)
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# define log3s(msg) ((void)0)
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#endif
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/*** Other shared functions ***/
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/* 2nd param is "uint32_t*" */
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int FAST_FUNC udhcp_str2nip(const char *str, void *arg);
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#if !ENABLE_UDHCPC6
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#define udhcp_insert_new_option(opt_list, code, length, dhcpv6) \
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udhcp_insert_new_option(opt_list, code, length)
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#endif
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void* FAST_FUNC udhcp_insert_new_option(struct option_set **opt_list,
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unsigned code,
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unsigned length,
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bool dhcpv6);
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/* 2nd param is "struct option_set**" */
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#if !ENABLE_UDHCPC6
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#define udhcp_str2optset(str, arg, optflags, option_strings, dhcpv6) \
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udhcp_str2optset(str, arg, optflags, option_strings)
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#endif
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int FAST_FUNC udhcp_str2optset(const char *str,
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void *arg,
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const struct dhcp_optflag *optflags,
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const char *option_strings,
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bool dhcpv6);
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#if ENABLE_UDHCPC || ENABLE_UDHCPD
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void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC;
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#endif
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int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC;
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int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt,
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uint32_t source_nip, int source_port,
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uint32_t dest_nip, int dest_port, const uint8_t *dest_arp,
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int ifindex) FAST_FUNC;
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int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt,
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uint32_t source_nip, int source_port,
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uint32_t dest_nip, int dest_port,
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const char *ifname) FAST_FUNC;
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void udhcp_sp_setup(void) FAST_FUNC;
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void udhcp_sp_fd_set(struct pollfd *pfds, int extra_fd) FAST_FUNC;
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int udhcp_sp_read(void) FAST_FUNC;
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int udhcp_read_interface(const char *interface,
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int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
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int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC;
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/* Returns 1 if no reply received */
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int arpping(uint32_t test_nip,
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const uint8_t *safe_mac,
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uint32_t from_ip,
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uint8_t *from_mac,
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const char *interface,
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unsigned timeo) FAST_FUNC;
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/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
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int sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip) FAST_FUNC;
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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