diff options
Diffstat (limited to 'networking')
| -rw-r--r-- | networking/udhcp/Kbuild | 2 | ||||
| -rw-r--r-- | networking/udhcp/common.h | 182 | ||||
| -rw-r--r-- | networking/udhcp/dhcpc.c | 370 | ||||
| -rw-r--r-- | networking/udhcp/dhcpd.c | 23 | ||||
| -rw-r--r-- | networking/udhcp/dhcprelay.c | 3 | ||||
| -rw-r--r-- | networking/udhcp/domain_codec.c | 1 | ||||
| -rw-r--r-- | networking/udhcp/files.c | 1 | ||||
| -rw-r--r-- | networking/udhcp/options.c | 21 | ||||
| -rw-r--r-- | networking/udhcp/options.h | 119 | ||||
| -rw-r--r-- | networking/udhcp/packet.c | 7 | ||||
| -rw-r--r-- | networking/udhcp/script.c | 283 |
11 files changed, 483 insertions, 529 deletions
diff --git a/networking/udhcp/Kbuild b/networking/udhcp/Kbuild index 693f6c8..c09f9aa 100644 --- a/networking/udhcp/Kbuild +++ b/networking/udhcp/Kbuild @@ -10,7 +10,7 @@ lib-y:= lib-$(CONFIG_UDHCPC) += common.o options.o packet.o signalpipe.o socket.o lib-$(CONFIG_UDHCPD) += common.o options.o packet.o signalpipe.o socket.o -lib-$(CONFIG_UDHCPC) += dhcpc.o script.o +lib-$(CONFIG_UDHCPC) += dhcpc.o lib-$(CONFIG_UDHCPD) += dhcpd.o arpping.o files.o leases.o static_leases.o lib-$(CONFIG_DUMPLEASES) += dumpleases.o lib-$(CONFIG_DHCPRELAY) += dhcprelay.o diff --git a/networking/udhcp/common.h b/networking/udhcp/common.h index d740ca5..2ce6759 100644 --- a/networking/udhcp/common.h +++ b/networking/udhcp/common.h @@ -15,17 +15,14 @@ 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 packet ***/ /* DHCP protocol. See RFC 2131 */ #define DHCP_MAGIC 0x63825363 - #define DHCP_OPTIONS_BUFSIZE 308 - #define BOOTREQUEST 1 #define BOOTREPLY 2 @@ -67,6 +64,116 @@ struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet { [(sizeof(struct ip_udp_dhcp_packet) != 576 + CONFIG_UDHCPC_SLACK_FOR_BUGGY_SERVERS) ? -1 : 1]; }; + +/*** Options ***/ + +enum { + OPTION_IP = 1, + OPTION_IP_PAIR, + OPTION_STRING, +#if ENABLE_FEATURE_UDHCP_RFC3397 + OPTION_STR1035, /* RFC1035 compressed domain name list */ +#endif + OPTION_BOOLEAN, + OPTION_U8, + OPTION_U16, + OPTION_S16, + OPTION_U32, + OPTION_S32, + OPTION_STATIC_ROUTES, + + OPTION_TYPE_MASK = 0x0f, + /* Client requests this option by default */ + OPTION_REQ = 0x10, + /* There can be a list of 1 or more of these */ + OPTION_LIST = 0x20, +}; + +/* DHCP option codes (partial list). See RFC 2132 and + * http://www.iana.org/assignments/bootp-dhcp-parameters/ + * Commented out options are handled by common option machinery, + * uncommented ones have spacial cases (grep for them to see). + */ +#define DHCP_PADDING 0x00 +#define DHCP_SUBNET 0x01 +//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */ +//#define DHCP_ROUTER 0x03 +//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */ +//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */ +//#define DHCP_DNS_SERVER 0x06 +//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog) +//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */ +//#define DHCP_LPR_SERVER 0x09 +#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */ +//#define DHCP_BOOT_SIZE 0x0d +//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */ +//#define DHCP_SWAP_SERVER 0x10 +//#define DHCP_ROOT_PATH 0x11 +//#define DHCP_IP_TTL 0x17 +//#define DHCP_MTU 0x1a +//#define DHCP_BROADCAST 0x1c +//#define DHCP_NIS_DOMAIN 0x28 +//#define DHCP_NIS_SERVER 0x29 +//#define DHCP_NTP_SERVER 0x2a +//#define DHCP_WINS_SERVER 0x2c +#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */ +#define DHCP_LEASE_TIME 0x33 +#define DHCP_OPTION_OVERLOAD 0x34 +#define DHCP_MESSAGE_TYPE 0x35 +#define DHCP_SERVER_ID 0x36 /* by default server's IP */ +#define DHCP_PARAM_REQ 0x37 /* list of options client wants */ +//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */ +#define DHCP_MAX_SIZE 0x39 +#define DHCP_VENDOR 0x3c /* client's vendor (a string) */ +#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */ +//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */ +//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */ +//#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */ +#define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */ +//#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */ +//#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */ +//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */ +#define DHCP_END 0xff + +/* Offsets in option byte sequence */ +#define OPT_CODE 0 +#define OPT_LEN 1 +#define OPT_DATA 2 +/* Bits in "overload" option */ +#define OPTION_FIELD 0 +#define FILE_FIELD 1 +#define SNAME_FIELD 2 + +/* DHCP_MESSAGE_TYPE values */ +#define DHCPDISCOVER 1 /* client -> server */ +#define DHCPOFFER 2 /* client <- server */ +#define DHCPREQUEST 3 /* client -> server */ +#define DHCPDECLINE 4 /* client -> server */ +#define DHCPACK 5 /* client <- server */ +#define DHCPNAK 6 /* client <- server */ +#define DHCPRELEASE 7 /* client -> server */ +#define DHCPINFORM 8 /* client -> server */ +#define DHCP_MINTYPE DHCPDISCOVER +#define DHCP_MAXTYPE DHCPINFORM + +struct dhcp_option { + uint8_t flags; + uint8_t code; +}; + +extern const struct dhcp_option dhcp_options[]; +extern const char dhcp_option_strings[]; +extern const uint8_t dhcp_option_lengths[]; + +uint8_t *udhcp_get_option(struct dhcp_packet *packet, int code) FAST_FUNC; +int udhcp_end_option(uint8_t *optionptr) FAST_FUNC; +void udhcp_add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC; +void udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC; +#if ENABLE_FEATURE_UDHCP_RFC3397 +char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC; +uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC; +#endif + // RFC 2131 Table 5: Fields and options used by DHCP clients // // Field DHCPDISCOVER DHCPREQUEST DHCPDECLINE, @@ -132,6 +239,33 @@ struct BUG_bad_sizeof_struct_ip_udp_dhcp_packet { // All others MAY MAY MUST NOT +/*** Logging ***/ + +#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 + + +/*** Other shared functions ***/ + uint16_t udhcp_checksum(void *addr, int count) FAST_FUNC; void udhcp_init_header(struct dhcp_packet *packet, char type) FAST_FUNC; @@ -147,24 +281,14 @@ 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, @@ -172,28 +296,6 @@ int arpping(uint32_t test_nip, 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 diff --git a/networking/udhcp/dhcpc.c b/networking/udhcp/dhcpc.c index e79feb7..7587509 100644 --- a/networking/udhcp/dhcpc.c +++ b/networking/udhcp/dhcpc.c @@ -24,7 +24,6 @@ #include "common.h" #include "dhcpd.h" #include "dhcpc.h" -#include "options.h" #include <asm/types.h> #if (defined(__GLIBC__) && __GLIBC__ >= 2 && __GLIBC_MINOR__ >= 1) || defined(_NEWLIB_VERSION) @@ -36,34 +35,278 @@ #endif #include <linux/filter.h> +/* struct client_config_t client_config is in bb_common_bufsiz1 */ -static int sockfd = -1; -#define LISTEN_NONE 0 -#define LISTEN_KERNEL 1 -#define LISTEN_RAW 2 -static smallint listen_mode; +/*** Script execution code ***/ -/* initial state: (re)start DHCP negotiation */ -#define INIT_SELECTING 0 -/* discover was sent, DHCPOFFER reply received */ -#define REQUESTING 1 -/* select/renew was sent, DHCPACK reply received */ -#define BOUND 2 -/* half of lease passed, want to renew it by sending unicast renew requests */ -#define RENEWING 3 -/* renew requests were not answered, lease is almost over, send broadcast renew */ -#define REBINDING 4 -/* manually requested renew (SIGUSR1) */ -#define RENEW_REQUESTED 5 -/* release, possibly manually requested (SIGUSR2) */ -#define RELEASED 6 -static smallint state; +/* get a rough idea of how long an option will be (rounding up...) */ +static const uint8_t len_of_option_as_string[] = { + [OPTION_IP] = sizeof("255.255.255.255 "), + [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2, + [OPTION_STATIC_ROUTES]= sizeof("255.255.255.255/32 255.255.255.255 "), + [OPTION_STRING] = 1, +#if ENABLE_FEATURE_UDHCP_RFC3397 + [OPTION_STR1035] = 1, +#endif + [OPTION_BOOLEAN] = sizeof("yes "), + [OPTION_U8] = sizeof("255 "), + [OPTION_U16] = sizeof("65535 "), + [OPTION_S16] = sizeof("-32768 "), + [OPTION_U32] = sizeof("4294967295 "), + [OPTION_S32] = sizeof("-2147483684 "), +}; + +/* note: ip is a pointer to an IP in network order, possibly misaliged */ +static int sprint_nip(char *dest, const char *pre, const uint8_t *ip) +{ + return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]); +} -/* struct client_config_t client_config is in bb_common_bufsiz1 */ +/* really simple implementation, just count the bits */ +static int mton(uint32_t mask) +{ + int i = 0; + mask = ntohl(mask); /* 111110000-like bit pattern */ + while (mask) { + i++; + mask <<= 1; + } + return i; +} + +/* Create "opt_name=opt_value" string */ +static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name) +{ + unsigned upper_length; + int len, type, optlen; + uint16_t val_u16; + int16_t val_s16; + uint32_t val_u32; + int32_t val_s32; + char *dest, *ret; + + /* option points to OPT_DATA, need to go back and get OPT_LEN */ + len = option[OPT_LEN - OPT_DATA]; + type = type_p->flags & OPTION_TYPE_MASK; + optlen = dhcp_option_lengths[type]; + upper_length = len_of_option_as_string[type] * (len / optlen); + + dest = ret = xmalloc(upper_length + strlen(opt_name) + 2); + dest += sprintf(ret, "%s=", opt_name); + + while (len >= optlen) { + switch (type) { + case OPTION_IP_PAIR: + dest += sprint_nip(dest, "", option); + *dest++ = '/'; + option += 4; + optlen = 4; + case OPTION_IP: + dest += sprint_nip(dest, "", option); +// TODO: it can be a list only if (type_p->flags & OPTION_LIST). +// Should we bail out/warn if we see multi-ip option which is +// not allowed to be such? For example, DHCP_BROADCAST... + break; + case OPTION_BOOLEAN: + dest += sprintf(dest, *option ? "yes" : "no"); + break; + case OPTION_U8: + dest += sprintf(dest, "%u", *option); + break; + case OPTION_U16: + move_from_unaligned16(val_u16, option); + dest += sprintf(dest, "%u", ntohs(val_u16)); + break; + case OPTION_S16: + move_from_unaligned16(val_s16, option); + dest += sprintf(dest, "%d", ntohs(val_s16)); + break; + case OPTION_U32: + move_from_unaligned32(val_u32, option); + dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32)); + break; + case OPTION_S32: + move_from_unaligned32(val_s32, option); + dest += sprintf(dest, "%ld", (long) ntohl(val_s32)); + break; + case OPTION_STRING: + memcpy(dest, option, len); + dest[len] = '\0'; + return ret; /* Short circuit this case */ + case OPTION_STATIC_ROUTES: { + /* Option binary format: + * mask [one byte, 0..32] + * ip [big endian, 0..4 bytes depending on mask] + * router [big endian, 4 bytes] + * may be repeated + * + * We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2" + */ + const char *pfx = ""; + + while (len >= 1 + 4) { /* mask + 0-byte ip + router */ + uint32_t nip; + uint8_t *p; + unsigned mask; + int bytes; + + mask = *option++; + if (mask > 32) + break; + len--; + + nip = 0; + p = (void*) &nip; + bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */ + while (--bytes >= 0) { + *p++ = *option++; + len--; + } + if (len < 4) + break; + + /* print ip/mask */ + dest += sprint_nip(dest, pfx, (void*) &nip); + pfx = " "; + dest += sprintf(dest, "/%u ", mask); + /* print router */ + dest += sprint_nip(dest, "", option); + option += 4; + len -= 4; + } + + return ret; + } +#if ENABLE_FEATURE_UDHCP_RFC3397 + case OPTION_STR1035: + /* unpack option into dest; use ret for prefix (i.e., "optname=") */ + dest = dname_dec(option, len, ret); + if (dest) { + free(ret); + return dest; + } + /* error. return "optname=" string */ + return ret; +#endif + } + option += optlen; + len -= optlen; + if (len <= 0) + break; + *dest++ = ' '; + *dest = '\0'; + } + return ret; +} + +/* put all the parameters into the environment */ +static char **fill_envp(struct dhcp_packet *packet) +{ + int num_options = 0; + int i; + char **envp, **curr; + const char *opt_name; + uint8_t *temp; + uint8_t over = 0; + + if (packet) { + for (i = 0; dhcp_options[i].code; i++) { + if (udhcp_get_option(packet, dhcp_options[i].code)) { + num_options++; + if (dhcp_options[i].code == DHCP_SUBNET) + num_options++; /* for mton */ + } + } + if (packet->siaddr_nip) + num_options++; + temp = udhcp_get_option(packet, DHCP_OPTION_OVERLOAD); + if (temp) + over = *temp; + if (!(over & FILE_FIELD) && packet->file[0]) + num_options++; + if (!(over & SNAME_FIELD) && packet->sname[0]) + num_options++; + } + + curr = envp = xzalloc(sizeof(char *) * (num_options + 3)); + *curr = xasprintf("interface=%s", client_config.interface); + putenv(*curr++); + + if (packet == NULL) + return envp; + + *curr = xmalloc(sizeof("ip=255.255.255.255")); + sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr); + putenv(*curr++); + + opt_name = dhcp_option_strings; + i = 0; + while (*opt_name) { + temp = udhcp_get_option(packet, dhcp_options[i].code); + if (!temp) + goto next; + *curr = xmalloc_optname_optval(temp, &dhcp_options[i], opt_name); + putenv(*curr++); + + /* Fill in a subnet bits option for things like /24 */ + if (dhcp_options[i].code == DHCP_SUBNET) { + uint32_t subnet; + move_from_unaligned32(subnet, temp); + *curr = xasprintf("mask=%d", mton(subnet)); + putenv(*curr++); + } + next: + opt_name += strlen(opt_name) + 1; + i++; + } + if (packet->siaddr_nip) { + *curr = xmalloc(sizeof("siaddr=255.255.255.255")); + sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip); + putenv(*curr++); + } + if (!(over & FILE_FIELD) && packet->file[0]) { + /* watch out for invalid packets */ + *curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file); + putenv(*curr++); + } + if (!(over & SNAME_FIELD) && packet->sname[0]) { + /* watch out for invalid packets */ + *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname); + putenv(*curr++); + } + return envp; +} + +/* Call a script with a par file and env vars */ +static void udhcp_run_script(struct dhcp_packet *packet, const char *name) +{ + char **envp, **curr; + char *argv[3]; + + if (client_config.script == NULL) + return; + + envp = fill_envp(packet); + + /* call script */ + log1("Executing %s %s", client_config.script, name); + argv[0] = (char*) client_config.script; + argv[1] = (char*) name; + argv[2] = NULL; + spawn_and_wait(argv); + + for (curr = envp; *curr; curr++) { + log2(" %s", *curr); + bb_unsetenv(*curr); + free(*curr); + } + free(envp); +} -/* Create a random xid */ +/*** Sending/receiving packets ***/ + static ALWAYS_INLINE uint32_t random_xid(void) { return rand(); @@ -75,16 +318,16 @@ static void init_packet(struct dhcp_packet *packet, char type) udhcp_init_header(packet, type); memcpy(packet->chaddr, client_config.client_mac, 6); if (client_config.clientid) - add_option_string(packet->options, client_config.clientid); + udhcp_add_option_string(packet->options, client_config.clientid); if (client_config.hostname) - add_option_string(packet->options, client_config.hostname); + udhcp_add_option_string(packet->options, client_config.hostname); if (client_config.fqdn) - add_option_string(packet->options, client_config.fqdn); + udhcp_add_option_string(packet->options, client_config.fqdn); if (type != DHCPDECLINE && type != DHCPRELEASE && client_config.vendorclass ) { - add_option_string(packet->options, client_config.vendorclass); + udhcp_add_option_string(packet->options, client_config.vendorclass); } } @@ -94,7 +337,7 @@ static void init_packet(struct dhcp_packet *packet, char type) static void add_param_req_option(struct dhcp_packet *packet) { uint8_t c; - int end = end_option(packet->options); + int end = udhcp_end_option(packet->options); int i, len = 0; for (i = 0; (c = dhcp_options[i].code) != 0; i++) { @@ -148,10 +391,10 @@ static int send_discover(uint32_t xid, uint32_t requested) init_packet(&packet, DHCPDISCOVER); packet.xid = xid; if (requested) - add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); + udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); /* Explicitly saying that we want RFC-compliant packets helps * some buggy DHCP servers to NOT send bigger packets */ - add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576)); + udhcp_add_simple_option(packet.options, DHCP_MAX_SIZE, htons(576)); add_param_req_option(&packet); bb_info_msg("Sending discover..."); @@ -169,8 +412,8 @@ static int send_select(uint32_t xid, uint32_t server, uint32_t requested) init_packet(&packet, DHCPREQUEST); packet.xid = xid; - add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); - add_simple_option(packet.options, DHCP_SERVER_ID, server); + udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); + udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server); add_param_req_option(&packet); addr.s_addr = requested; @@ -204,8 +447,8 @@ static int send_decline(uint32_t xid, uint32_t server, uint32_t requested) init_packet(&packet, DHCPDECLINE); packet.xid = xid; - add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); - add_simple_option(packet.options, DHCP_SERVER_ID, server); + udhcp_add_simple_option(packet.options, DHCP_REQUESTED_IP, requested); + udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server); bb_info_msg("Sending decline..."); return raw_bcast_from_client_config_ifindex(&packet); @@ -221,7 +464,7 @@ static int send_release(uint32_t server, uint32_t ciaddr) packet.xid = random_xid(); packet.ciaddr = ciaddr; - add_simple_option(packet.options, DHCP_SERVER_ID, server); + udhcp_add_simple_option(packet.options, DHCP_SERVER_ID, server); bb_info_msg("Sending release..."); return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT); @@ -297,6 +540,32 @@ static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd) return bytes - (sizeof(packet.ip) + sizeof(packet.udp)); } + +/*** Main ***/ + +static int sockfd = -1; + +#define LISTEN_NONE 0 +#define LISTEN_KERNEL 1 +#define LISTEN_RAW 2 +static smallint listen_mode; + +/* initial state: (re)start DHCP negotiation */ +#define INIT_SELECTING 0 +/* discover was sent, DHCPOFFER reply received */ +#define REQUESTING 1 +/* select/renew was sent, DHCPACK reply received */ +#define BOUND 2 +/* half of lease passed, want to renew it by sending unicast renew requests */ +#define RENEWING 3 +/* renew requests were not answered, lease is almost over, send broadcast renew */ +#define REBINDING 4 +/* manually requested renew (SIGUSR1) */ +#define RENEW_REQUESTED 5 +/* release, possibly manually requested (SIGUSR2) */ +#define RELEASED 6 +static smallint state; + static int udhcp_raw_socket(int ifindex) { int fd; @@ -368,7 +637,6 @@ static int udhcp_raw_socket(int ifindex) return fd; } -/* just a little helper */ static void change_listen_mode(int new_mode) { log1("Entering listen mode: %s", @@ -389,7 +657,6 @@ static void change_listen_mode(int new_mode) /* else LISTEN_NONE: sockfd stays closed */ } -/* perform a renew */ static void perform_renew(void) { bb_info_msg("Performing a DHCP renew"); @@ -412,7 +679,6 @@ static void perform_renew(void) } } -/* perform a release */ static void perform_release(uint32_t requested_ip, uint32_t server_addr) { char buffer[sizeof("255.255.255.255")]; @@ -434,16 +700,6 @@ static void perform_release(uint32_t requested_ip, uint32_t server_addr) state = RELEASED; } -#if BB_MMU -static void client_background(void) -{ - bb_daemonize(0); - logmode &= ~LOGMODE_STDIO; - /* rewrite pidfile, as our pid is different now */ - write_pidfile(client_config.pidfile); -} -#endif - static uint8_t* alloc_dhcp_option(int code, const char *str, int extra) { uint8_t *storage; @@ -455,6 +711,16 @@ static uint8_t* alloc_dhcp_option(int code, const char *str, int extra) return storage; } +#if BB_MMU +static void client_background(void) +{ + bb_daemonize(0); + logmode &= ~LOGMODE_STDIO; + /* rewrite pidfile, as our pid is different now */ + write_pidfile(client_config.pidfile); +} +#endif + int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; int udhcpc_main(int argc UNUSED_PARAM, char **argv) { @@ -541,7 +807,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;) IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;) client_config.interface = "eth0"; - client_config.script = DEFAULT_SCRIPT; + client_config.script = CONFIG_UDHCPC_DEFAULT_SCRIPT; str_V = "udhcp "BB_VER; /* Parse command line */ @@ -861,7 +1127,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) continue; } - message = get_option(&packet, DHCP_MESSAGE_TYPE); + message = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE); if (message == NULL) { bb_error_msg("no message type option, ignoring packet"); continue; @@ -872,7 +1138,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) /* Must be a DHCPOFFER to one of our xid's */ if (*message == DHCPOFFER) { /* TODO: why we don't just fetch server's IP from IP header? */ - temp = get_option(&packet, DHCP_SERVER_ID); + temp = udhcp_get_option(&packet, DHCP_SERVER_ID); if (!temp) { bb_error_msg("no server ID in message"); continue; @@ -895,7 +1161,7 @@ int udhcpc_main(int argc UNUSED_PARAM, char **argv) case RENEW_REQUESTED: case REBINDING: if (*message == DHCPACK) { - temp = get_option(&packet, DHCP_LEASE_TIME); + temp = udhcp_get_option(&packet, DHCP_LEASE_TIME); if (!temp) { bb_error_msg("no lease time with ACK, using 1 hour lease"); lease_seconds = 60 * 60; diff --git a/networking/udhcp/dhcpd.c b/networking/udhcp/dhcpd.c index d6e90cd..93e06b2 100644 --- a/networking/udhcp/dhcpd.c +++ b/networking/udhcp/dhcpd.c @@ -25,7 +25,6 @@ #include "common.h" #include "dhcpc.h" #include "dhcpd.h" -#include "options.h" /* Send a packet to a specific mac address and ip address by creating our own ip packet */ @@ -94,7 +93,7 @@ static void init_packet(struct dhcp_packet *packet, struct dhcp_packet *oldpacke packet->flags = oldpacket->flags; packet->gateway_nip = oldpacket->gateway_nip; packet->ciaddr = oldpacket->ciaddr; - add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip); + udhcp_add_simple_option(packet->options, DHCP_SERVER_ID, server_config.server_nip); } /* Fill options field, siaddr_nip, and sname and boot_file fields. @@ -106,7 +105,7 @@ static void add_server_options(struct dhcp_packet *packet) while (curr) { if (curr->data[OPT_CODE] != DHCP_LEASE_TIME) - add_option_string(packet->options, curr->data); + udhcp_add_option_string(packet->options, curr->data); curr = curr->next; } @@ -121,7 +120,7 @@ static void add_server_options(struct dhcp_packet *packet) static uint32_t select_lease_time(struct dhcp_packet *packet) { uint32_t lease_time_sec = server_config.max_lease_sec; - uint8_t *lease_time_opt = get_option(packet, DHCP_LEASE_TIME); + uint8_t *lease_time_opt = udhcp_get_option(packet, DHCP_LEASE_TIME); if (lease_time_opt) { move_from_unaligned32(lease_time_sec, lease_time_opt); lease_time_sec = ntohl(lease_time_sec); @@ -159,7 +158,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip, packet.yiaddr = lease->lease_nip; } /* Or: if client has requested an IP */ - else if ((req_ip_opt = get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL + else if ((req_ip_opt = udhcp_get_option(oldpacket, DHCP_REQUESTED_IP)) != NULL /* (read IP) */ && (move_from_unaligned32(req_nip, req_ip_opt), 1) /* and the IP is in the lease range */ @@ -182,7 +181,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip, return; } /* Reserve the IP for a short time hoping to get DHCPREQUEST soon */ - p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME); + p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME); lease = add_lease(packet.chaddr, packet.yiaddr, server_config.offer_time, p_host_name, @@ -195,7 +194,7 @@ static void send_offer(struct dhcp_packet *oldpacket, uint32_t static_lease_nip, } lease_time_sec = select_lease_time(oldpacket); - add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec)); + udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec)); add_server_options(&packet); addr.s_addr = packet.yiaddr; @@ -225,7 +224,7 @@ static void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr) packet.yiaddr = yiaddr; lease_time_sec = select_lease_time(oldpacket); - add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec)); + udhcp_add_simple_option(packet.options, DHCP_LEASE_TIME, htonl(lease_time_sec)); add_server_options(&packet); @@ -233,7 +232,7 @@ static void send_ACK(struct dhcp_packet *oldpacket, uint32_t yiaddr) bb_info_msg("Sending ACK to %s", inet_ntoa(addr)); send_packet(&packet, /*force_bcast:*/ 0); - p_host_name = (const char*) get_option(oldpacket, DHCP_HOST_NAME); + p_host_name = (const char*) udhcp_get_option(oldpacket, DHCP_HOST_NAME); add_lease(packet.chaddr, packet.yiaddr, lease_time_sec, p_host_name, @@ -422,7 +421,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv) bb_error_msg("not a REQUEST, ignoring packet"); continue; } - state = get_option(&packet, DHCP_MESSAGE_TYPE); + state = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE); if (state == NULL || state[0] < DHCP_MINTYPE || state[0] > DHCP_MAXTYPE) { bb_error_msg("no or bad message type option, ignoring packet"); continue; @@ -441,7 +440,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv) } /* Get REQUESTED_IP and SERVER_ID if present */ - server_id_opt = get_option(&packet, DHCP_SERVER_ID); + server_id_opt = udhcp_get_option(&packet, DHCP_SERVER_ID); if (server_id_opt) { uint32_t server_id_net; move_from_unaligned32(server_id_net, server_id_opt); @@ -451,7 +450,7 @@ int udhcpd_main(int argc UNUSED_PARAM, char **argv) continue; } } - requested_opt = get_option(&packet, DHCP_REQUESTED_IP); + requested_opt = udhcp_get_option(&packet, DHCP_REQUESTED_IP); if (requested_opt) { move_from_unaligned32(requested_nip, requested_opt); } diff --git a/networking/udhcp/dhcprelay.c b/networking/udhcp/dhcprelay.c index a7e715f..9f6ac69 100644 --- a/networking/udhcp/dhcprelay.c +++ b/networking/udhcp/dhcprelay.c @@ -11,7 +11,6 @@ */ #include "common.h" -#include "options.h" #define SERVER_PORT 67 #define SELECT_TIMEOUT 5 /* select timeout in sec. */ @@ -105,7 +104,7 @@ static int get_dhcp_packet_type(struct dhcp_packet *p) if (p->op != BOOTREQUEST && p->op != BOOTREPLY) return -1; /* get message type option */ - op = get_option(p, DHCP_MESSAGE_TYPE); + op = udhcp_get_option(p, DHCP_MESSAGE_TYPE); if (op != NULL) return op[0]; return -1; diff --git a/networking/udhcp/domain_codec.c b/networking/udhcp/domain_codec.c index 45354e7..c00b4ed 100644 --- a/networking/udhcp/domain_codec.c +++ b/networking/udhcp/domain_codec.c @@ -10,7 +10,6 @@ #if ENABLE_FEATURE_UDHCP_RFC3397 #include "common.h" -#include "options.h" #define NS_MAXDNAME 1025 /* max domain name length */ #define NS_MAXCDNAME 255 /* max compressed domain name length */ diff --git a/networking/udhcp/files.c b/networking/udhcp/files.c index 62f4a38..a23e886 100644 --- a/networking/udhcp/files.c +++ b/networking/udhcp/files.c @@ -10,7 +10,6 @@ #include "common.h" #include "dhcpd.h" -#include "options.h" #if BB_LITTLE_ENDIAN static inline uint64_t hton64(uint64_t v) diff --git a/networking/udhcp/options.c b/networking/udhcp/options.c index 29a2640..b4d2d2d 100644 --- a/networking/udhcp/options.c +++ b/networking/udhcp/options.c @@ -7,8 +7,6 @@ */ #include "common.h" -#include "dhcpd.h" -#include "options.h" /* Supported options are easily added here. @@ -111,7 +109,6 @@ const char dhcp_option_strings[] ALIGN1 = "wpad" "\0" /* DHCP_WPAD */ ; - /* Lengths of the different option types */ const uint8_t dhcp_option_lengths[] ALIGN1 = { [OPTION_IP] = 4, @@ -144,9 +141,8 @@ static void log_option(const char *pfx, const uint8_t *opt) # define log_option(pfx, opt) ((void)0) #endif - /* get an option with bounds checking (warning, result is not aligned). */ -uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code) +uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code) { uint8_t *optionptr; int len; @@ -162,7 +158,7 @@ uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code) rem = sizeof(packet->options); while (1) { if (rem <= 0) { - bb_error_msg("bogus packet, malformed option field"); + bb_error_msg("bad packet, malformed option field"); return NULL; } if (optionptr[OPT_CODE] == DHCP_PADDING) { @@ -209,9 +205,8 @@ uint8_t* FAST_FUNC get_option(struct dhcp_packet *packet, int code) return NULL; } - /* return the position of the 'end' option (no bounds checking) */ -int FAST_FUNC end_option(uint8_t *optionptr) +int FAST_FUNC udhcp_end_option(uint8_t *optionptr) { int i = 0; @@ -223,12 +218,11 @@ int FAST_FUNC end_option(uint8_t *optionptr) return i; } - /* add an option string to the options */ /* option bytes: [code][len][data1][data2]..[dataLEN] */ -void FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string) +void FAST_FUNC udhcp_add_option_string(uint8_t *optionptr, uint8_t *string) { - int end = end_option(optionptr); + int end = udhcp_end_option(optionptr); /* end position + string length + option code/length + end option */ if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) { @@ -241,9 +235,8 @@ void FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string) optionptr[end + string[OPT_LEN] + 2] = DHCP_END; } - /* add a one to four byte option to a packet */ -void FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) +void FAST_FUNC udhcp_add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) { const struct dhcp_option *dh; @@ -258,7 +251,7 @@ void FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data data <<= 8 * (4 - len); /* Assignment is unaligned! */ move_to_unaligned32(&option[OPT_DATA], data); - add_option_string(optionptr, option); + udhcp_add_option_string(optionptr, option); return; } } diff --git a/networking/udhcp/options.h b/networking/udhcp/options.h deleted file mode 100644 index 3ca4dc4..0000000 --- a/networking/udhcp/options.h +++ /dev/null @@ -1,119 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* options.h */ -#ifndef UDHCP_OPTIONS_H -#define UDHCP_OPTIONS_H 1 - -PUSH_AND_SET_FUNCTION_VISIBILITY_TO_HIDDEN - - -enum { - OPTION_IP = 1, - OPTION_IP_PAIR, - OPTION_STRING, -#if ENABLE_FEATURE_UDHCP_RFC3397 - OPTION_STR1035, /* RFC1035 compressed domain name list */ -#endif - OPTION_BOOLEAN, - OPTION_U8, - OPTION_U16, - OPTION_S16, - OPTION_U32, - OPTION_S32, - OPTION_STATIC_ROUTES, - - OPTION_TYPE_MASK = 0x0f, - /* Client requests this option by default */ - OPTION_REQ = 0x10, - /* There can be a list of 1 or more of these */ - OPTION_LIST = 0x20, -}; - -/* DHCP option codes (partial list). See RFC 2132 and - * http://www.iana.org/assignments/bootp-dhcp-parameters/ - * Commented out options are handled by common option machinery, - * uncommented ones have spacial cases (grep for them to see). - */ -#define DHCP_PADDING 0x00 -#define DHCP_SUBNET 0x01 -//#define DHCP_TIME_OFFSET 0x02 /* (localtime - UTC_time) in seconds. signed */ -//#define DHCP_ROUTER 0x03 -//#define DHCP_TIME_SERVER 0x04 /* RFC 868 time server (32-bit, 0 = 1.1.1900) */ -//#define DHCP_NAME_SERVER 0x05 /* IEN 116 _really_ ancient kind of NS */ -//#define DHCP_DNS_SERVER 0x06 -//#define DHCP_LOG_SERVER 0x07 /* port 704 UDP log (not syslog) -//#define DHCP_COOKIE_SERVER 0x08 /* "quote of the day" server */ -//#define DHCP_LPR_SERVER 0x09 -#define DHCP_HOST_NAME 0x0c /* either client informs server or server gives name to client */ -//#define DHCP_BOOT_SIZE 0x0d -//#define DHCP_DOMAIN_NAME 0x0f /* server gives domain suffix */ -//#define DHCP_SWAP_SERVER 0x10 -//#define DHCP_ROOT_PATH 0x11 -//#define DHCP_IP_TTL 0x17 -//#define DHCP_MTU 0x1a -//#define DHCP_BROADCAST 0x1c -//#define DHCP_NIS_DOMAIN 0x28 -//#define DHCP_NIS_SERVER 0x29 -//#define DHCP_NTP_SERVER 0x2a -//#define DHCP_WINS_SERVER 0x2c -#define DHCP_REQUESTED_IP 0x32 /* sent by client if specific IP is wanted */ -#define DHCP_LEASE_TIME 0x33 -#define DHCP_OPTION_OVERLOAD 0x34 -#define DHCP_MESSAGE_TYPE 0x35 -#define DHCP_SERVER_ID 0x36 /* by default server's IP */ -#define DHCP_PARAM_REQ 0x37 /* list of options client wants */ -//#define DHCP_ERR_MESSAGE 0x38 /* error message when sending NAK etc */ -#define DHCP_MAX_SIZE 0x39 -#define DHCP_VENDOR 0x3c /* client's vendor (a string) */ -#define DHCP_CLIENT_ID 0x3d /* by default client's MAC addr, but may be arbitrarily long */ -//#define DHCP_TFTP_SERVER_NAME 0x42 /* same as 'sname' field */ -//#define DHCP_BOOT_FILE 0x43 /* same as 'file' field */ -//#define DHCP_USER_CLASS 0x4d /* RFC 3004. set of LASCII strings. "I am a printer" etc */ -#define DHCP_FQDN 0x51 /* client asks to update DNS to map its FQDN to its new IP */ -//#define DHCP_DOMAIN_SEARCH 0x77 /* RFC 3397. set of ASCIZ string, DNS-style compressed */ -//#define DHCP_STATIC_ROUTES 0x79 /* RFC 3442. (mask,ip,router) tuples */ -//#define DHCP_WPAD 0xfc /* MSIE's Web Proxy Autodiscovery Protocol */ -#define DHCP_END 0xff - -/* Offsets in option byte sequence */ -#define OPT_CODE 0 -#define OPT_LEN 1 -#define OPT_DATA 2 -/* Bits in "overload" option */ -#define OPTION_FIELD 0 -#define FILE_FIELD 1 -#define SNAME_FIELD 2 - -/* DHCP_MESSAGE_TYPE values */ -#define DHCPDISCOVER 1 /* client -> server */ -#define DHCPOFFER 2 /* client <- server */ -#define DHCPREQUEST 3 /* client -> server */ -#define DHCPDECLINE 4 /* client -> server */ -#define DHCPACK 5 /* client <- server */ -#define DHCPNAK 6 /* client <- server */ -#define DHCPRELEASE 7 /* client -> server */ -#define DHCPINFORM 8 /* client -> server */ -#define DHCP_MINTYPE DHCPDISCOVER -#define DHCP_MAXTYPE DHCPINFORM - - -struct dhcp_option { - uint8_t flags; - uint8_t code; -}; - -extern const struct dhcp_option dhcp_options[]; -extern const char dhcp_option_strings[]; -extern const uint8_t dhcp_option_lengths[]; - -uint8_t *get_option(struct dhcp_packet *packet, int code) FAST_FUNC; -int end_option(uint8_t *optionptr) FAST_FUNC; -void add_option_string(uint8_t *optionptr, uint8_t *string) FAST_FUNC; -void add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data) FAST_FUNC; -#if ENABLE_FEATURE_UDHCP_RFC3397 -char *dname_dec(const uint8_t *cstr, int clen, const char *pre) FAST_FUNC; -uint8_t *dname_enc(const uint8_t *cstr, int clen, const char *src, int *retlen) FAST_FUNC; -#endif - -POP_SAVED_FUNCTION_VISIBILITY - -#endif diff --git a/networking/udhcp/packet.c b/networking/udhcp/packet.c index 84d8309..03d5e1f 100644 --- a/networking/udhcp/packet.c +++ b/networking/udhcp/packet.c @@ -17,7 +17,6 @@ #include "common.h" #include "dhcpd.h" -#include "options.h" void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type) { @@ -34,7 +33,7 @@ void FAST_FUNC udhcp_init_header(struct dhcp_packet *packet, char type) packet->cookie = htonl(DHCP_MAGIC); if (DHCP_END != 0) packet->options[0] = DHCP_END; - add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type); + udhcp_add_simple_option(packet->options, DHCP_MESSAGE_TYPE, type); } #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2 @@ -105,7 +104,7 @@ int FAST_FUNC udhcp_recv_kernel_packet(struct dhcp_packet *packet, int fd) udhcp_dump_packet(packet); if (packet->op == BOOTREQUEST) { - vendor = get_option(packet, DHCP_VENDOR); + vendor = udhcp_get_option(packet, DHCP_VENDOR); if (vendor) { #if 0 static const char broken_vendors[][8] = { @@ -221,7 +220,7 @@ int FAST_FUNC udhcp_send_raw_packet(struct dhcp_packet *dhcp_pkt, /* Currently we send full-sized DHCP packets (zero padded). * If you need to change this: last byte of the packet is - * packet.data.options[end_option(packet.data.options)] + * packet.data.options[udhcp_end_option(packet.data.options)] */ udhcp_dump_packet(dhcp_pkt); result = sendto(fd, &packet, IP_UPD_DHCP_SIZE, 0, diff --git a/networking/udhcp/script.c b/networking/udhcp/script.c deleted file mode 100644 index 400fd2b..0000000 --- a/networking/udhcp/script.c +++ /dev/null @@ -1,283 +0,0 @@ -/* vi: set sw=4 ts=4: */ -/* script.c - * - * Functions to call the DHCP client notification scripts - * - * Russ Dill <Russ.Dill@asu.edu> July 2001 - * - * Licensed under GPLv2 or later, see file LICENSE in this tarball for details. - */ - -#include "common.h" -#include "dhcpc.h" -#include "options.h" - - -/* get a rough idea of how long an option will be (rounding up...) */ -static const uint8_t len_of_option_as_string[] = { - [OPTION_IP] = sizeof("255.255.255.255 "), - [OPTION_IP_PAIR] = sizeof("255.255.255.255 ") * 2, - [OPTION_STATIC_ROUTES]= sizeof("255.255.255.255/32 255.255.255.255 "), - [OPTION_STRING] = 1, -#if ENABLE_FEATURE_UDHCP_RFC3397 - [OPTION_STR1035] = 1, -#endif - [OPTION_BOOLEAN] = sizeof("yes "), - [OPTION_U8] = sizeof("255 "), - [OPTION_U16] = sizeof("65535 "), - [OPTION_S16] = sizeof("-32768 "), - [OPTION_U32] = sizeof("4294967295 "), - [OPTION_S32] = sizeof("-2147483684 "), -}; - - -/* note: ip is a pointer to an IP in network order, possibly misaliged */ -static int sprint_nip(char *dest, const char *pre, const uint8_t *ip) -{ - return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]); -} - - -/* really simple implementation, just count the bits */ -static int mton(uint32_t mask) -{ - int i = 0; - mask = ntohl(mask); /* 111110000-like bit pattern */ - while (mask) { - i++; - mask <<= 1; - } - return i; -} - - -/* Create "opt_name=opt_value" string */ -static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_option *type_p, const char *opt_name) -{ - unsigned upper_length; - int len, type, optlen; - uint16_t val_u16; - int16_t val_s16; - uint32_t val_u32; - int32_t val_s32; - char *dest, *ret; - - /* option points to OPT_DATA, need to go back and get OPT_LEN */ - len = option[OPT_LEN - OPT_DATA]; - type = type_p->flags & OPTION_TYPE_MASK; - optlen = dhcp_option_lengths[type]; - upper_length = len_of_option_as_string[type] * (len / optlen); - - dest = ret = xmalloc(upper_length + strlen(opt_name) + 2); - dest += sprintf(ret, "%s=", opt_name); - - while (len >= optlen) { - switch (type) { - case OPTION_IP_PAIR: - dest += sprint_nip(dest, "", option); - *dest++ = '/'; - option += 4; - optlen = 4; - case OPTION_IP: - dest += sprint_nip(dest, "", option); -// TODO: it can be a list only if (type_p->flags & OPTION_LIST). -// Should we bail out/warn if we see multi-ip option which is -// not allowed to be such? For example, DHCP_BROADCAST... - break; - case OPTION_BOOLEAN: - dest += sprintf(dest, *option ? "yes" : "no"); - break; - case OPTION_U8: - dest += sprintf(dest, "%u", *option); - break; - case OPTION_U16: - move_from_unaligned16(val_u16, option); - dest += sprintf(dest, "%u", ntohs(val_u16)); - break; - case OPTION_S16: - move_from_unaligned16(val_s16, option); - dest += sprintf(dest, "%d", ntohs(val_s16)); - break; - case OPTION_U32: - move_from_unaligned32(val_u32, option); - dest += sprintf(dest, "%lu", (unsigned long) ntohl(val_u32)); - break; - case OPTION_S32: - move_from_unaligned32(val_s32, option); - dest += sprintf(dest, "%ld", (long) ntohl(val_s32)); - break; - case OPTION_STRING: - memcpy(dest, option, len); - dest[len] = '\0'; - return ret; /* Short circuit this case */ - case OPTION_STATIC_ROUTES: { - /* Option binary format: - * mask [one byte, 0..32] - * ip [big endian, 0..4 bytes depending on mask] - * router [big endian, 4 bytes] - * may be repeated - * - * We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2" - */ - const char *pfx = ""; - - while (len >= 1 + 4) { /* mask + 0-byte ip + router */ - uint32_t nip; - uint8_t *p; - unsigned mask; - int bytes; - - mask = *option++; - if (mask > 32) - break; - len--; - - nip = 0; - p = (void*) &nip; - bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */ - while (--bytes >= 0) { - *p++ = *option++; - len--; - } - if (len < 4) - break; - - /* print ip/mask */ - dest += sprint_nip(dest, pfx, (void*) &nip); - pfx = " "; - dest += sprintf(dest, "/%u ", mask); - /* print router */ - dest += sprint_nip(dest, "", option); - option += 4; - len -= 4; - } - - return ret; - } -#if ENABLE_FEATURE_UDHCP_RFC3397 - case OPTION_STR1035: - /* unpack option into dest; use ret for prefix (i.e., "optname=") */ - dest = dname_dec(option, len, ret); - if (dest) { - free(ret); - return dest; - } - /* error. return "optname=" string */ - return ret; -#endif - } - option += optlen; - len -= optlen; - if (len <= 0) - break; - *dest++ = ' '; - *dest = '\0'; - } - return ret; -} - - -/* put all the parameters into the environment */ -static char **fill_envp(struct dhcp_packet *packet) -{ - int num_options = 0; - int i; - char **envp, **curr; - const char *opt_name; - uint8_t *temp; - uint8_t over = 0; - - if (packet) { - for (i = 0; dhcp_options[i].code; i++) { - if (get_option(packet, dhcp_options[i].code)) { - num_options++; - if (dhcp_options[i].code == DHCP_SUBNET) - num_options++; /* for mton */ - } - } - if (packet->siaddr_nip) - num_options++; - temp = get_option(packet, DHCP_OPTION_OVERLOAD); - if (temp) - over = *temp; - if (!(over & FILE_FIELD) && packet->file[0]) - num_options++; - if (!(over & SNAME_FIELD) && packet->sname[0]) - num_options++; - } - - curr = envp = xzalloc(sizeof(char *) * (num_options + 3)); - *curr = xasprintf("interface=%s", client_config.interface); - putenv(*curr++); - - if (packet == NULL) - return envp; - - *curr = xmalloc(sizeof("ip=255.255.255.255")); - sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr); - putenv(*curr++); - - opt_name = dhcp_option_strings; - i = 0; - while (*opt_name) { - temp = get_option(packet, dhcp_options[i].code); - if (!temp) - goto next; - *curr = xmalloc_optname_optval(temp, &dhcp_options[i], opt_name); - putenv(*curr++); - - /* Fill in a subnet bits option for things like /24 */ - if (dhcp_options[i].code == DHCP_SUBNET) { - uint32_t subnet; - move_from_unaligned32(subnet, temp); - *curr = xasprintf("mask=%d", mton(subnet)); - putenv(*curr++); - } - next: - opt_name += strlen(opt_name) + 1; - i++; - } - if (packet->siaddr_nip) { - *curr = xmalloc(sizeof("siaddr=255.255.255.255")); - sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip); - putenv(*curr++); - } - if (!(over & FILE_FIELD) && packet->file[0]) { - /* watch out for invalid packets */ - *curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file); - putenv(*curr++); - } - if (!(over & SNAME_FIELD) && packet->sname[0]) { - /* watch out for invalid packets */ - *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname); - putenv(*curr++); - } - return envp; -} - - -/* Call a script with a par file and env vars */ -void FAST_FUNC udhcp_run_script(struct dhcp_packet *packet, const char *name) -{ - char **envp, **curr; - char *argv[3]; - - if (client_config.script == NULL) - return; - - envp = fill_envp(packet); - - /* call script */ - log1("Executing %s %s", client_config.script, name); - argv[0] = (char*) client_config.script; - argv[1] = (char*) name; - argv[2] = NULL; - spawn_and_wait(argv); - - for (curr = envp; *curr; curr++) { - log2(" %s", *curr); - bb_unsetenv(*curr); - free(*curr); - } - free(envp); -} |