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112 lines
3.7 KiB
C
112 lines
3.7 KiB
C
/* vi: set sw=4 ts=4: */
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/* common.h
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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 tarball for details.
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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 <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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#define DEFAULT_SCRIPT CONFIG_UDHCPC_DEFAULT_SCRIPT
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extern const uint8_t MAC_BCAST_ADDR[6]; /* six all-ones */
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/*** packet.h ***/
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#define DHCP_OPTIONS_BUFSIZE 308
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//TODO: rename to dhcp_packet; rename ciaddr/yiaddr/chaddr
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struct dhcpMessage {
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uint8_t op; /* 1 = BOOTREQUEST, 2 = 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 to use in bootstrap, returned in DHCPOFFER, DHCPACK by server */
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uint32_t siaddr_nip;
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uint32_t gateway_nip; /* relay agent IP address */
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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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uint8_t file[128]; /* boot file name (ASCIZ) */
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uint32_t cookie; /* fixed first four option bytes (99,130,83,99 dec) */
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uint8_t options[DHCP_OPTIONS_BUFSIZE + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS];
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} PACKED;
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//TODO: rename to ip_udp_dhcp_packet?
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struct udp_dhcp_packet {
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struct iphdr ip;
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struct udphdr udp;
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struct dhcpMessage data;
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} PACKED;
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/* Let's see whether compiler understood us right */
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struct BUG_bad_sizeof_struct_udp_dhcp_packet {
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char BUG_bad_sizeof_struct_udp_dhcp_packet
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[(sizeof(struct udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1];
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};
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uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC;
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void udhcp_init_header(struct dhcpMessage *packet, char type) FAST_FUNC;
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/*int udhcp_recv_raw_packet(struct dhcpMessage *payload, int fd); - in dhcpc.h */
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int udhcp_recv_kernel_packet(struct dhcpMessage *packet, int fd) FAST_FUNC;
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int udhcp_send_raw_packet(struct dhcpMessage *payload,
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uint32_t source_ip, int source_port,
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uint32_t dest_ip, 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 dhcpMessage *payload,
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uint32_t source_ip, int source_port,
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uint32_t dest_ip, int dest_port) FAST_FUNC;
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/**/
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void udhcp_run_script(struct dhcpMessage *packet, const char *name) FAST_FUNC;
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// Still need to clean these up...
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/* from options.h */
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#define get_option udhcp_get_option
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#define end_option udhcp_end_option
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#define add_option_string udhcp_add_option_string
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#define add_simple_option udhcp_add_simple_option
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void udhcp_sp_setup(void) FAST_FUNC;
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int udhcp_sp_fd_set(fd_set *rfds, int extra_fd) FAST_FUNC;
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int udhcp_sp_read(const fd_set *rfds) FAST_FUNC;
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int udhcp_read_interface(const char *interface, int *ifindex, uint32_t *nip, uint8_t *mac) FAST_FUNC;
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int udhcp_raw_socket(int ifindex) 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_ip,
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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) FAST_FUNC;
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#if ENABLE_UDHCP_DEBUG
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# define DEBUG(str, args...) bb_info_msg("### " str, ## args)
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#else
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# define DEBUG(str, args...) do {;} while (0)
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#endif
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POP_SAVED_FUNCTION_VISIBILITY
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#endif
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