| /* vi: set sw=4 ts=4: */ |
| /* common.h |
| * |
| * 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 |
| |
| #define DEFAULT_SCRIPT CONFIG_UDHCPC_DEFAULT_SCRIPT |
| |
| extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */ |
| |
| /*** packet.h ***/ |
| |
| /* 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]; |
| }; |
| |
| // RFC 2131 Table 5: Fields and options used by DHCP clients |
| // |
| // Field DHCPDISCOVER DHCPREQUEST DHCPDECLINE, |
| // DHCPINFORM DHCPRELEASE |
| // ----- ------------ ----------- ----------- |
| // 'op' BOOTREQUEST BOOTREQUEST BOOTREQUEST |
| // 'hops' 0 0 0 |
| // 'xid' selected by client 'xid' from server selected by |
| // DHCPOFFER message client |
| // 'secs' 0 or seconds since 0 or seconds since 0 |
| // DHCP process started DHCP process started |
| // 'flags' Set 'BROADCAST' Set 'BROADCAST' 0 |
| // flag if client flag if client |
| // requires broadcast requires broadcast |
| // reply reply |
| // 'ciaddr' 0 (DHCPDISCOVER) 0 or client's 0 (DHCPDECLINE) |
| // client's network address client's network |
| // network address (BOUND/RENEW/REBIND) address |
| // (DHCPINFORM) (DHCPRELEASE) |
| // 'yiaddr' 0 0 0 |
| // 'siaddr' 0 0 0 |
| // 'giaddr' 0 0 0 |
| // 'chaddr' client's hardware client's hardware client's hardware |
| // address address address |
| // 'sname' options, if options, if (unused) |
| // indicated in indicated in |
| // 'sname/file' 'sname/file' |
| // option; otherwise option; otherwise |
| // unused unused |
| // 'file' options, if options, if (unused) |
| // indicated in indicated in |
| // 'sname/file' 'sname/file' |
| // option; otherwise option; otherwise |
| // unused unused |
| // 'options' options options (unused) |
| // |
| // Option DHCPDISCOVER DHCPREQUEST DHCPDECLINE, |
| // DHCPINFORM DHCPRELEASE |
| // ------ ------------ ----------- ----------- |
| // Requested IP address MAY MUST (in MUST |
| // (DISCOVER) SELECTING or (DHCPDECLINE), |
| // MUST NOT INIT-REBOOT) MUST NOT |
| // (INFORM) MUST NOT (in (DHCPRELEASE) |
| // BOUND or |
| // RENEWING) |
| // IP address lease time MAY MAY MUST NOT |
| // (DISCOVER) |
| // MUST NOT |
| // (INFORM) |
| // Use 'file'/'sname' fields MAY MAY MAY |
| // Client identifier MAY MAY MAY |
| // Vendor class identifier MAY MAY MUST NOT |
| // Server identifier MUST NOT MUST (after MUST |
| // SELECTING) |
| // MUST NOT (after |
| // INIT-REBOOT, |
| // BOUND, RENEWING |
| // or REBINDING) |
| // Parameter request list MAY MAY MUST NOT |
| // Maximum message size MAY MAY MUST NOT |
| // Message SHOULD NOT SHOULD NOT SHOULD |
| // Site-specific MAY MAY MUST NOT |
| // All others MAY MAY MUST NOT |
| |
| |
| 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_run_script(struct dhcp_packet *packet, const char *name) FAST_FUNC; |
| |
| // Still need to clean these up... |
| |
| /* from options.h */ |
| #define get_option udhcp_get_option |
| #define end_option udhcp_end_option |
| #define add_option_string udhcp_add_option_string |
| #define add_simple_option udhcp_add_simple_option |
| |
| 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; |
| |
| #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 |
| |
| POP_SAVED_FUNCTION_VISIBILITY |
| |
| #endif |