Changeset 2725 in MondoRescue for branches/2.2.9/mindi-busybox/networking/udhcp/common.h
- Timestamp:
- Feb 25, 2011, 9:26:54 PM (13 years ago)
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branches/2.2.9/mindi-busybox/networking/udhcp/common.h
r1765 r2725 1 1 /* vi: set sw=4 ts=4: */ 2 /* common.h 3 * 2 /* 4 3 * Russ Dill <Russ.Dill@asu.edu> September 2001 5 4 * Rewritten by Vladimir Oleynik <dzo@simtreas.ru> (C) 2003 6 5 * 7 * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.6 * Licensed under GPLv2 or later, see file LICENSE in this source tree. 8 7 */ 9 10 #ifndef _COMMON_H 11 #define _COMMON_H 8 #ifndef UDHCP_COMMON_H 9 #define UDHCP_COMMON_H 1 12 10 13 11 #include "libbb.h" 14 15 #define DEFAULT_SCRIPT "/usr/share/udhcpc/default.script"16 17 extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */18 19 /*** packet.h ***/20 21 12 #include <netinet/udp.h> 22 13 #include <netinet/ip.h> 23 14 24 struct dhcpMessage { 25 uint8_t op; 26 uint8_t htype; 27 uint8_t hlen; 28 uint8_t hops; 29 uint32_t xid; 30 uint16_t secs; 31 uint16_t flags; 32 uint32_t ciaddr; 33 uint32_t yiaddr; 34 uint32_t siaddr; 35 uint32_t giaddr; 36 uint8_t chaddr[16]; 37 uint8_t sname[64]; 38 uint8_t file[128]; 39 uint32_t cookie; 40 uint8_t options[308]; /* 312 - cookie */ 41 }; 42 43 struct udp_dhcp_packet { 15 PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN 16 17 extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */ 18 19 20 /*** DHCP packet ***/ 21 22 /* DHCP protocol. See RFC 2131 */ 23 #define DHCP_MAGIC 0x63825363 24 #define DHCP_OPTIONS_BUFSIZE 308 25 #define BOOTREQUEST 1 26 #define BOOTREPLY 2 27 28 //TODO: rename ciaddr/yiaddr/chaddr 29 struct dhcp_packet { 30 uint8_t op; /* BOOTREQUEST or BOOTREPLY */ 31 uint8_t htype; /* hardware address type. 1 = 10mb ethernet */ 32 uint8_t hlen; /* hardware address length */ 33 uint8_t hops; /* used by relay agents only */ 34 uint32_t xid; /* unique id */ 35 uint16_t secs; /* elapsed since client began acquisition/renewal */ 36 uint16_t flags; /* only one flag so far: */ 37 #define BROADCAST_FLAG 0x8000 /* "I need broadcast replies" */ 38 uint32_t ciaddr; /* client IP (if client is in BOUND, RENEW or REBINDING state) */ 39 uint32_t yiaddr; /* 'your' (client) IP address */ 40 /* IP address of next server to use in bootstrap, returned in DHCPOFFER, DHCPACK by server */ 41 uint32_t siaddr_nip; 42 uint32_t gateway_nip; /* relay agent IP address */ 43 uint8_t chaddr[16]; /* link-layer client hardware address (MAC) */ 44 uint8_t sname[64]; /* server host name (ASCIZ) */ 45 uint8_t file[128]; /* boot file name (ASCIZ) */ 46 uint32_t cookie; /* fixed first four option bytes (99,130,83,99 dec) */ 47 uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS]; 48 } PACKED; 49 #define DHCP_PKT_SNAME_LEN 64 50 #define DHCP_PKT_FILE_LEN 128 51 #define DHCP_PKT_SNAME_LEN_STR "64" 52 #define DHCP_PKT_FILE_LEN_STR "128" 53 54 struct ip_udp_dhcp_packet { 44 55 struct iphdr ip; 45 56 struct udphdr udp; 46 struct dhcpMessage data; 47 }; 48 49 void udhcp_init_header(struct dhcpMessage *packet, char type); 50 int udhcp_get_packet(struct dhcpMessage *packet, int fd); 51 uint16_t udhcp_checksum(void *addr, int count); 52 int udhcp_raw_packet(struct dhcpMessage *payload, 53 uint32_t source_ip, int source_port, 54 uint32_t dest_ip, int dest_port, 55 const uint8_t *dest_arp, int ifindex); 56 int udhcp_kernel_packet(struct dhcpMessage *payload, 57 uint32_t source_ip, int source_port, 58 uint32_t dest_ip, int dest_port); 59 60 61 /**/ 62 63 void udhcp_run_script(struct dhcpMessage *packet, const char *name); 64 65 // Still need to clean these up... 66 67 /* from options.h */ 68 #define get_option udhcp_get_option 69 #define end_option udhcp_end_option 70 #define add_option_string udhcp_add_option_string 71 #define add_simple_option udhcp_add_simple_option 72 #define option_lengths udhcp_option_lengths 73 /* from socket.h */ 74 #define listen_socket udhcp_listen_socket 75 #define read_interface udhcp_read_interface 76 /* from dhcpc.h */ 77 #define client_config udhcp_client_config 78 /* from dhcpd.h */ 79 #define server_config udhcp_server_config 80 81 void udhcp_sp_setup(void); 82 int udhcp_sp_fd_set(fd_set *rfds, int extra_fd); 83 int udhcp_sp_read(fd_set *rfds); 84 int raw_socket(int ifindex); 85 int read_interface(const char *interface, int *ifindex, uint32_t *addr, uint8_t *arp); 86 int listen_socket(/*uint32_t ip,*/ int port, const char *inf); 57 struct dhcp_packet data; 58 } PACKED; 59 60 struct udp_dhcp_packet { 61 struct udphdr udp; 62 struct dhcp_packet data; 63 } PACKED; 64 65 enum { 66 IP_UDP_DHCP_SIZE = sizeof(struct ip_udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS, 67 UDP_DHCP_SIZE = sizeof(struct udp_dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS, 68 DHCP_SIZE = sizeof(struct dhcp_packet) - CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS, 69 }; 70 71 /* Let's see whether compiler understood us right */ 72 struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet { 73 char c[IP_UDP_DHCP_SIZE == 576 ? 1 : -1]; 74 }; 75 76 77 /*** Options ***/ 78 79 enum { 80 OPTION_IP = 1, 81 OPTION_IP_PAIR, 82 OPTION_STRING, 83 // OPTION_BOOLEAN, 84 OPTION_U8, 85 OPTION_U16, 86 // OPTION_S16, 87 OPTION_U32, 88 OPTION_S32, 89 OPTION_BIN, 90 OPTION_STATIC_ROUTES, 91 #if ENABLE_FEATURE_UDHCP_RFC3397 92 OPTION_DNS_STRING, /* RFC1035 compressed domain name list */ 93 OPTION_SIP_SERVERS, 94 #endif 95 96 OPTION_TYPE_MASK = 0x0f, 97 /* Client requests this option by default */ 98 OPTION_REQ = 0x10, 99 /* There can be a list of 1 or more of these */ 100 OPTION_LIST = 0x20, 101 }; 102 103 /* DHCP option codes (partial list). See RFC 2132 and 104 * http://www.iana.org/assignments/bootp-dhcp-parameters/ 105 * Commented out options are handled by common option machinery, 106 * uncommented ones have spacial cases (grep for them to see). 107 */ 108 #define DHCP_PADDING 0x00 109 #define DHCP_SUBNET 0x01 110 //#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */ 111 //#define DHCP_ROUTER 0x03 112 //#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */ 113 //#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */ 114 //#define DHCP_DNS_SERVER 0x06 115 //#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog) 116 //#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */ 117 //#define DHCP_LPR_SERVER 0x09 118 #define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */ 119 //#define DHCP_BOOT_SIZE 0x0d 120 //#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */ 121 //#define DHCP_SWAP_SERVER 0x10 122 //#define DHCP_ROOT_PATH 0x11 123 //#define DHCP_IP_TTL 0x17 124 //#define DHCP_MTU 0x1a 125 //#define DHCP_BROADCAST 0x1c 126 //#define DHCP_ROUTES 0x21 127 //#define DHCP_NIS_DOMAIN 0x28 128 //#define DHCP_NIS_SERVER 0x29 129 //#define DHCP_NTP_SERVER 0x2a 130 //#define DHCP_WINS_SERVER 0x2c 131 #define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */ 132 #define DHCP_LEASE_TIME 0x33 133 #define DHCP_OPTION_OVERLOAD 0x34 134 #define DHCP_MESSAGE_TYPE 0x35 135 #define DHCP_SERVER_ID 0x36 /* by default server's IP */ 136 #define DHCP_PARAM_REQ 0x37 /* list of options client wants */ 137 //#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */ 138 #define DHCP_MAX_SIZE 0x39 139 #define DHCP_VENDOR 0x3c /* client's vendor (a string) */ 140 #define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */ 141 //#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */ 142 //#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */ 143 //#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */ 144 #define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */ 145 //#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */ 146 //#define DHCP_SIP_SERVERS 0x78 /* RFC 3361. flag byte, then: 0: domain names, 1: IP addrs */ 147 //#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */ 148 //#define DHCP_MS_STATIC_ROUTES 0xf9 /* Microsoft's pre-RFC 3442 code for 0x79? */ 149 //#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */ 150 #define DHCP_END 0xff 151 152 /* Offsets in option byte sequence */ 153 #define OPT_CODE 0 154 #define OPT_LEN 1 155 #define OPT_DATA 2 156 /* Bits in "overload" option */ 157 #define OPTION_FIELD 0 158 #define FILE_FIELD 1 159 #define SNAME_FIELD 2 160 161 /* DHCP_MESSAGE_TYPE values */ 162 #define DHCPDISCOVER 1 /* client -> server */ 163 #define DHCPOFFER 2 /* client <- server */ 164 #define DHCPREQUEST 3 /* client -> server */ 165 #define DHCPDECLINE 4 /* client -> server */ 166 #define DHCPACK 5 /* client <- server */ 167 #define DHCPNAK 6 /* client <- server */ 168 #define DHCPRELEASE 7 /* client -> server */ 169 #define DHCPINFORM 8 /* client -> server */ 170 #define DHCP_MINTYPE DHCPDISCOVER 171 #define DHCP_MAXTYPE DHCPINFORM 172 173 struct dhcp_optflag { 174 uint8_t flags; 175 uint8_t code; 176 }; 177 178 struct option_set { 179 uint8_t *data; 180 struct option_set *next; 181 }; 182 183 extern const struct dhcp_optflag dhcp_optflags[]; 184 extern const char dhcp_option_strings[]; 185 extern const uint8_t dhcp_option_lengths[]; 186 187 unsigned FAST_FUNC udhcp_option_idx(const char *name); 188 189 uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC; 190 int udhcp_end_option(uint8_t *optionptr) FAST_FUNC; 191 void udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt) FAST_FUNC; 192 void udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data) FAST_FUNC; 193 #if ENABLE_FEATURE_UDHCP_RFC3397 194 char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC; 195 uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC; 196 #endif 197 struct option_set *udhcp_find_option(struct option_set *opt_list, uint8_t code) FAST_FUNC; 198 199 200 // RFC 2131 Table 5: Fields and options used by DHCP clients 201 // 202 // Fields 'hops', 'yiaddr', 'siaddr', 'giaddr' are always zero 203 // 204 // Field DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE 205 // ----- ------------ ------------ ----------- ----------- ----------- 206 // 'xid' selected by client selected by client 'xid' from server selected by client selected by client 207 // DHCPOFFER message 208 // 'secs' 0 or seconds since 0 or seconds since 0 or seconds since 0 0 209 // DHCP process started DHCP process started DHCP process started 210 // 'flags' Set 'BROADCAST' Set 'BROADCAST' Set 'BROADCAST' 0 0 211 // flag if client flag if client flag if client 212 // requires broadcast requires broadcast requires broadcast 213 // reply reply reply 214 // 'ciaddr' 0 client's IP 0 or client's IP 0 client's IP 215 // (BOUND/RENEW/REBIND) 216 // 'chaddr' client's MAC client's MAC client's MAC client's MAC client's MAC 217 // 'sname' options or sname options or sname options or sname (unused) (unused) 218 // 'file' options or file options or file options or file (unused) (unused) 219 // 'options' options options options message type opt message type opt 220 // 221 // Option DHCPDISCOVER DHCPINFORM DHCPREQUEST DHCPDECLINE DHCPRELEASE 222 // ------ ------------ ---------- ----------- ----------- ----------- 223 // Requested IP address MAY MUST NOT MUST (in MUST MUST NOT 224 // SELECTING or 225 // INIT-REBOOT) 226 // MUST NOT (in 227 // BOUND or 228 // RENEWING) 229 // IP address lease time MAY MUST NOT MAY MUST NOT MUST NOT 230 // Use 'file'/'sname' fields MAY MAY MAY MAY MAY 231 // Client identifier MAY MAY MAY MAY MAY 232 // Vendor class identifier MAY MAY MAY MUST NOT MUST NOT 233 // Server identifier MUST NOT MUST NOT MUST (after MUST MUST 234 // SELECTING) 235 // MUST NOT (after 236 // INIT-REBOOT, 237 // BOUND, RENEWING 238 // or REBINDING) 239 // Parameter request list MAY MAY MAY MUST NOT MUST NOT 240 // Maximum message size MAY MAY MAY MUST NOT MUST NOT 241 // Message SHOULD NOT SHOULD NOT SHOULD NOT SHOULD SHOULD 242 // Site-specific MAY MAY MAY MUST NOT MUST NOT 243 // All others MAY MAY MAY MUST NOT MUST NOT 244 245 246 /*** Logging ***/ 247 248 #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 249 extern unsigned dhcp_verbose; 250 # define log1(...) do { if (dhcp_verbose >= 1) bb_info_msg(__VA_ARGS__); } while (0) 251 # if CONFIG_UDHCP_DEBUG >= 2 252 void udhcp_dump_packet(struct dhcp_packet *packet) FAST_FUNC; 253 # define log2(...) do { if (dhcp_verbose >= 2) bb_info_msg(__VA_ARGS__); } while (0) 254 # else 255 # define udhcp_dump_packet(...) ((void)0) 256 # define log2(...) ((void)0) 257 # endif 258 # if CONFIG_UDHCP_DEBUG >= 3 259 # define log3(...) do { if (dhcp_verbose >= 3) bb_info_msg(__VA_ARGS__); } while (0) 260 # else 261 # define log3(...) ((void)0) 262 # endif 263 #else 264 # define udhcp_dump_packet(...) ((void)0) 265 # define log1(...) ((void)0) 266 # define log2(...) ((void)0) 267 # define log3(...) ((void)0) 268 #endif 269 270 271 /*** Other shared functions ***/ 272 273 /* 2nd param is "uint32_t*" */ 274 int FAST_FUNC udhcp_str2nip(const char *str, void *arg); 275 /* 2nd param is "struct option_set**" */ 276 int FAST_FUNC udhcp_str2optset(const char *str, void *arg); 277 278 uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC; 279 280 void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC; 281 282 int udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) FAST_FUNC; 283 284 int udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt, 285 uint32_t source_nip, int source_port, 286 uint32_t dest_nip, int dest_port, const uint8_t *dest_arp, 287 int ifindex) FAST_FUNC; 288 289 int udhcp_send_kernel_packet(struct dhcp_packet *dhcp_pkt, 290 uint32_t source_nip, int source_port, 291 uint32_t dest_nip, int dest_port) FAST_FUNC; 292 293 void udhcp_sp_setup(void) FAST_FUNC; 294 int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC; 295 int udhcp_sp_read(const fd_set *rfds) FAST_FUNC; 296 297 int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC; 298 299 int udhcp_listen_socket(/*uint32_t ip,*/ int port, const char *inf) FAST_FUNC; 300 87 301 /* Returns 1 if no reply received */ 88 int arpping(uint32_t test_ip, uint32_t from_ip, uint8_t *from_mac, const char *interface); 89 90 #if ENABLE_FEATURE_UDHCP_DEBUG 91 # define DEBUG(str, args...) bb_info_msg(str, ## args) 92 #else 93 # define DEBUG(str, args...) do {;} while (0) 302 int arpping(uint32_t test_nip, 303 const uint8_t *safe_mac, 304 uint32_t from_ip, 305 uint8_t *from_mac, 306 const char *interface) FAST_FUNC; 307 308 POP_SAVED_FUNCTION_VISIBILITY 309 94 310 #endif 95 96 #endif
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