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The following options are replaced with string "bad" if they contain malformed hostname: HOST_NAME, DOMAIN_NAME, NIS_DOMAIN, TFTP_SERVER_NAME function old new delta xmalloc_optname_optval 850 888 +38 attach_option 440 443 +3 len_of_option_as_string 13 14 +1 dhcp_option_lengths 13 14 +1 ------------------------------------------------------------------------------ (add/remove: 0/0 grow/shrink: 4/0 up/down: 43/0) Total: 43 bytes Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>
565 lines
18 KiB
C
565 lines
18 KiB
C
/* vi: set sw=4 ts=4: */
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/*
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* Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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*
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* Licensed under GPLv2, see file LICENSE in this source tree.
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*/
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#include "common.h"
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
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unsigned dhcp_verbose;
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#endif
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const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
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0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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};
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/* Supported options are easily added here.
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* See RFC2132 for more options.
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* OPTION_REQ: these options are requested by udhcpc (unless -o).
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*/
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const struct dhcp_optflag dhcp_optflags[] = {
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/* flags code */
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{ OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
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{ OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
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{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
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// { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
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// { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
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{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
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// { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
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// { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
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{ OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
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{ OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
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{ OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
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{ OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
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{ OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
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{ OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
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{ OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
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{ OPTION_U16 , 0x1a }, /* DHCP_MTU */
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//TODO: why do we request DHCP_BROADCAST? Can't we assume that
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//in the unlikely case it is different from typical N.N.255.255,
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//server would let us know anyway?
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{ OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
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{ OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
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{ OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
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{ OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
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{ OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
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{ OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
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{ OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */
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{ OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
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{ OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
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//TODO: must be combined with 'sname' and 'file' handling:
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{ OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
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{ OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
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//TODO: not a string, but a set of LASCII strings:
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// { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
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#if ENABLE_FEATURE_UDHCP_RFC3397
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{ OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
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{ OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
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#endif
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{ OPTION_STATIC_ROUTES , 0x79 }, /* DHCP_STATIC_ROUTES */
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#if ENABLE_FEATURE_UDHCP_8021Q
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{ OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */
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{ OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */
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#endif
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{ OPTION_6RD , 0xd4 }, /* DHCP_6RD */
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{ OPTION_STATIC_ROUTES , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
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{ OPTION_STRING , 0xfc }, /* DHCP_WPAD */
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/* Options below have no match in dhcp_option_strings[],
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* are not passed to dhcpc scripts, and cannot be specified
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* with "option XXX YYY" syntax in dhcpd config file.
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* These entries are only used internally by udhcp[cd]
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* to correctly encode options into packets.
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*/
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{ OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
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{ OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
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{ OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
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//looks like these opts will work just fine even without these defs:
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// { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
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// /* not really a string: */
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// { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
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{ 0, 0 } /* zeroed terminating entry */
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};
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/* Used for converting options from incoming packets to env variables
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* for udhcpc stript, and for setting options for udhcpd via
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* "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
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*/
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/* Must match dhcp_optflags[] order */
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const char dhcp_option_strings[] ALIGN1 =
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"subnet" "\0" /* DHCP_SUBNET */
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"timezone" "\0" /* DHCP_TIME_OFFSET */
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"router" "\0" /* DHCP_ROUTER */
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// "timesrv" "\0" /* DHCP_TIME_SERVER */
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// "namesrv" "\0" /* DHCP_NAME_SERVER */
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"dns" "\0" /* DHCP_DNS_SERVER */
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// "logsrv" "\0" /* DHCP_LOG_SERVER */
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// "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
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"lprsrv" "\0" /* DHCP_LPR_SERVER */
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"hostname" "\0" /* DHCP_HOST_NAME */
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"bootsize" "\0" /* DHCP_BOOT_SIZE */
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"domain" "\0" /* DHCP_DOMAIN_NAME */
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"swapsrv" "\0" /* DHCP_SWAP_SERVER */
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"rootpath" "\0" /* DHCP_ROOT_PATH */
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"ipttl" "\0" /* DHCP_IP_TTL */
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"mtu" "\0" /* DHCP_MTU */
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"broadcast" "\0" /* DHCP_BROADCAST */
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"routes" "\0" /* DHCP_ROUTES */
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"nisdomain" "\0" /* DHCP_NIS_DOMAIN */
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"nissrv" "\0" /* DHCP_NIS_SERVER */
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"ntpsrv" "\0" /* DHCP_NTP_SERVER */
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"wins" "\0" /* DHCP_WINS_SERVER */
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"lease" "\0" /* DHCP_LEASE_TIME */
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"serverid" "\0" /* DHCP_SERVER_ID */
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"message" "\0" /* DHCP_ERR_MESSAGE */
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"tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
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"bootfile" "\0" /* DHCP_BOOT_FILE */
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// "userclass" "\0" /* DHCP_USER_CLASS */
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#if ENABLE_FEATURE_UDHCP_RFC3397
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"search" "\0" /* DHCP_DOMAIN_SEARCH */
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// doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
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// is not handled yet by "string->option" conversion code:
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"sipsrv" "\0" /* DHCP_SIP_SERVERS */
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#endif
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// doesn't work in udhcpd.conf since OPTION_STATIC_ROUTES
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// is not handled yet by "string->option" conversion code:
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"staticroutes" "\0"/* DHCP_STATIC_ROUTES */
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#if ENABLE_FEATURE_UDHCP_8021Q
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"vlanid" "\0" /* DHCP_VLAN_ID */
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"vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */
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#endif
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"ip6rd" "\0" /* DHCP_6RD */
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"msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
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"wpad" "\0" /* DHCP_WPAD */
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;
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/* Lengths of the option types in binary form.
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* Used by:
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* udhcp_str2optset: to determine how many bytes to allocate.
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* xmalloc_optname_optval: to estimate string length
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* from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
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* is the number of elements, multiply in by one element's string width
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* (len_of_option_as_string[opt_type]) and you know how wide string you need.
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*/
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const uint8_t dhcp_option_lengths[] ALIGN1 = {
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[OPTION_IP] = 4,
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[OPTION_IP_PAIR] = 8,
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// [OPTION_BOOLEAN] = 1,
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[OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
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[OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */
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#if ENABLE_FEATURE_UDHCP_RFC3397
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[OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
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[OPTION_SIP_SERVERS] = 1,
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#endif
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[OPTION_U8] = 1,
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[OPTION_U16] = 2,
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// [OPTION_S16] = 2,
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[OPTION_U32] = 4,
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[OPTION_S32] = 4,
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/* Just like OPTION_STRING, we use minimum length here */
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[OPTION_STATIC_ROUTES] = 5,
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[OPTION_6RD] = 22, /* ignored by udhcp_str2optset */
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};
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#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
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static void log_option(const char *pfx, const uint8_t *opt)
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{
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if (dhcp_verbose >= 2) {
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char buf[256 * 2 + 2];
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*bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
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bb_info_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
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}
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}
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#else
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# define log_option(pfx, opt) ((void)0)
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#endif
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unsigned FAST_FUNC udhcp_option_idx(const char *name)
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{
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int n = index_in_strings(dhcp_option_strings, name);
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if (n >= 0)
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return n;
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{
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char buf[sizeof(dhcp_option_strings)];
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char *d = buf;
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const char *s = dhcp_option_strings;
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while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
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*d++ = (*s == '\0' ? ' ' : *s);
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s++;
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}
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*d = '\0';
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bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
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}
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}
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/* Get an option with bounds checking (warning, result is not aligned) */
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uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
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{
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uint8_t *optionptr;
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int len;
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int rem;
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int overload = 0;
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enum {
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FILE_FIELD101 = FILE_FIELD * 0x101,
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SNAME_FIELD101 = SNAME_FIELD * 0x101,
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};
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/* option bytes: [code][len][data1][data2]..[dataLEN] */
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optionptr = packet->options;
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rem = sizeof(packet->options);
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while (1) {
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if (rem <= 0) {
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bb_error_msg("bad packet, malformed option field");
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return NULL;
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}
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if (optionptr[OPT_CODE] == DHCP_PADDING) {
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rem--;
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optionptr++;
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continue;
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}
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if (optionptr[OPT_CODE] == DHCP_END) {
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if ((overload & FILE_FIELD101) == FILE_FIELD) {
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/* can use packet->file, and didn't look at it yet */
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overload |= FILE_FIELD101; /* "we looked at it" */
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optionptr = packet->file;
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rem = sizeof(packet->file);
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continue;
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}
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if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
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/* can use packet->sname, and didn't look at it yet */
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overload |= SNAME_FIELD101; /* "we looked at it" */
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optionptr = packet->sname;
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rem = sizeof(packet->sname);
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continue;
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}
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break;
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}
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len = 2 + optionptr[OPT_LEN];
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rem -= len;
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if (rem < 0)
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continue; /* complain and return NULL */
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if (optionptr[OPT_CODE] == code) {
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log_option("Option found", optionptr);
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return optionptr + OPT_DATA;
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}
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if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
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overload |= optionptr[OPT_DATA];
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/* fall through */
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}
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optionptr += len;
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}
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/* log3 because udhcpc uses it a lot - very noisy */
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log3("Option 0x%02x not found", code);
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return NULL;
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}
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/* Return the position of the 'end' option (no bounds checking) */
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int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
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{
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int i = 0;
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while (optionptr[i] != DHCP_END) {
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if (optionptr[i] != DHCP_PADDING)
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i += optionptr[i + OPT_LEN] + OPT_DATA-1;
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i++;
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}
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return i;
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}
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/* Add an option (supplied in binary form) to the options.
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* Option format: [code][len][data1][data2]..[dataLEN]
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*/
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void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
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{
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unsigned len;
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uint8_t *optionptr = packet->options;
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unsigned end = udhcp_end_option(optionptr);
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len = OPT_DATA + addopt[OPT_LEN];
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/* end position + (option code/length + addopt length) + end option */
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if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
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//TODO: learn how to use overflow option if we exhaust packet->options[]
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bb_error_msg("option 0x%02x did not fit into the packet",
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addopt[OPT_CODE]);
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return;
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}
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log_option("Adding option", addopt);
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memcpy(optionptr + end, addopt, len);
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optionptr[end + len] = DHCP_END;
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}
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/* Add an one to four byte option to a packet */
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void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
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{
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const struct dhcp_optflag *dh;
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for (dh = dhcp_optflags; dh->code; dh++) {
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if (dh->code == code) {
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uint8_t option[6], len;
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option[OPT_CODE] = code;
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len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
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option[OPT_LEN] = len;
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if (BB_BIG_ENDIAN)
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data <<= 8 * (4 - len);
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/* Assignment is unaligned! */
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move_to_unaligned32(&option[OPT_DATA], data);
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udhcp_add_binary_option(packet, option);
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return;
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}
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}
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bb_error_msg("can't add option 0x%02x", code);
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}
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/* Find option 'code' in opt_list */
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struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
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{
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while (opt_list && opt_list->data[OPT_CODE] < code)
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opt_list = opt_list->next;
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if (opt_list && opt_list->data[OPT_CODE] == code)
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return opt_list;
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return NULL;
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}
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/* Parse string to IP in network order */
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int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
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{
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len_and_sockaddr *lsa;
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lsa = host_and_af2sockaddr(str, 0, AF_INET);
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if (!lsa)
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return 0;
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*(uint32_t*)arg = lsa->u.sin.sin_addr.s_addr;
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free(lsa);
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return 1;
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}
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/* udhcp_str2optset:
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* Parse string option representation to binary form and add it to opt_list.
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* Called to parse "udhcpc -x OPTNAME:OPTVAL"
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* and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
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*/
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/* helper for the helper */
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static char *allocate_tempopt_if_needed(
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const struct dhcp_optflag *optflag,
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char *buffer,
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int *length_p)
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{
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char *allocated = NULL;
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if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
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const char *end;
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allocated = xstrdup(buffer); /* more than enough */
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end = hex2bin(allocated, buffer, 255);
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if (errno)
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bb_error_msg_and_die("malformed hex string '%s'", buffer);
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*length_p = end - allocated;
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}
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return allocated;
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}
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/* helper: add an option to the opt_list */
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static NOINLINE void attach_option(
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struct option_set **opt_list,
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const struct dhcp_optflag *optflag,
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char *buffer,
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int length)
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{
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struct option_set *existing, *new, **curr;
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char *allocated = NULL;
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existing = udhcp_find_option(*opt_list, optflag->code);
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if (!existing) {
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log2("Attaching option %02x to list", optflag->code);
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allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
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#if ENABLE_FEATURE_UDHCP_RFC3397
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if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
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/* reuse buffer and length for RFC1035-formatted string */
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allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
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}
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#endif
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/* make a new option */
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new = xmalloc(sizeof(*new));
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new->data = xmalloc(length + OPT_DATA);
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new->data[OPT_CODE] = optflag->code;
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new->data[OPT_LEN] = length;
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memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
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curr = opt_list;
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while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
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curr = &(*curr)->next;
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new->next = *curr;
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*curr = new;
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goto ret;
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}
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if (optflag->flags & OPTION_LIST) {
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unsigned old_len;
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/* add it to an existing option */
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log2("Attaching option %02x to existing member of list", optflag->code);
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allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
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old_len = existing->data[OPT_LEN];
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#if ENABLE_FEATURE_UDHCP_RFC3397
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if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
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/* reuse buffer and length for RFC1035-formatted string */
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allocated = buffer = (char *)dname_enc(existing->data + OPT_DATA, old_len, buffer, &length);
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}
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#endif
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if (old_len + length < 255) {
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/* actually 255 is ok too, but adding a space can overlow it */
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existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
|
|
if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
|
|
|| (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
|
|
) {
|
|
/* add space separator between STRING options in a list */
|
|
existing->data[OPT_DATA + old_len] = ' ';
|
|
old_len++;
|
|
}
|
|
memcpy(existing->data + OPT_DATA + old_len, buffer, length);
|
|
existing->data[OPT_LEN] = old_len + length;
|
|
} /* else, ignore the data, we could put this in a second option in the future */
|
|
} /* else, ignore the new data */
|
|
|
|
ret:
|
|
free(allocated);
|
|
}
|
|
|
|
int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
|
{
|
|
struct option_set **opt_list = arg;
|
|
char *opt, *val, *endptr;
|
|
char *str;
|
|
const struct dhcp_optflag *optflag;
|
|
struct dhcp_optflag bin_optflag;
|
|
unsigned optcode;
|
|
int retval, length;
|
|
char buffer[8] ALIGNED(4);
|
|
uint16_t *result_u16 = (uint16_t *) buffer;
|
|
uint32_t *result_u32 = (uint32_t *) buffer;
|
|
|
|
/* Cheat, the only *const* str possible is "" */
|
|
str = (char *) const_str;
|
|
opt = strtok(str, " \t=");
|
|
if (!opt)
|
|
return 0;
|
|
|
|
optcode = bb_strtou(opt, NULL, 0);
|
|
if (!errno && optcode < 255) {
|
|
/* Raw (numeric) option code */
|
|
bin_optflag.flags = OPTION_BIN;
|
|
bin_optflag.code = optcode;
|
|
optflag = &bin_optflag;
|
|
} else {
|
|
optflag = &dhcp_optflags[udhcp_option_idx(opt)];
|
|
}
|
|
|
|
retval = 0;
|
|
do {
|
|
val = strtok(NULL, ", \t");
|
|
if (!val)
|
|
break;
|
|
length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
|
|
retval = 0;
|
|
opt = buffer; /* new meaning for variable opt */
|
|
switch (optflag->flags & OPTION_TYPE_MASK) {
|
|
case OPTION_IP:
|
|
retval = udhcp_str2nip(val, buffer);
|
|
break;
|
|
case OPTION_IP_PAIR:
|
|
retval = udhcp_str2nip(val, buffer);
|
|
val = strtok(NULL, ", \t/-");
|
|
if (!val)
|
|
retval = 0;
|
|
if (retval)
|
|
retval = udhcp_str2nip(val, buffer + 4);
|
|
break;
|
|
case OPTION_STRING:
|
|
case OPTION_STRING_HOST:
|
|
#if ENABLE_FEATURE_UDHCP_RFC3397
|
|
case OPTION_DNS_STRING:
|
|
#endif
|
|
length = strnlen(val, 254);
|
|
if (length > 0) {
|
|
opt = val;
|
|
retval = 1;
|
|
}
|
|
break;
|
|
// case OPTION_BOOLEAN: {
|
|
// static const char no_yes[] ALIGN1 = "no\0yes\0";
|
|
// buffer[0] = retval = index_in_strings(no_yes, val);
|
|
// retval++; /* 0 - bad; 1: "no" 2: "yes" */
|
|
// break;
|
|
// }
|
|
case OPTION_U8:
|
|
buffer[0] = strtoul(val, &endptr, 0);
|
|
retval = (endptr[0] == '\0');
|
|
break;
|
|
/* htonX are macros in older libc's, using temp var
|
|
* in code below for safety */
|
|
/* TODO: use bb_strtoX? */
|
|
case OPTION_U16: {
|
|
unsigned long tmp = strtoul(val, &endptr, 0);
|
|
*result_u16 = htons(tmp);
|
|
retval = (endptr[0] == '\0' /*&& tmp < 0x10000*/);
|
|
break;
|
|
}
|
|
// case OPTION_S16: {
|
|
// long tmp = strtol(val, &endptr, 0);
|
|
// *result_u16 = htons(tmp);
|
|
// retval = (endptr[0] == '\0');
|
|
// break;
|
|
// }
|
|
case OPTION_U32: {
|
|
unsigned long tmp = strtoul(val, &endptr, 0);
|
|
*result_u32 = htonl(tmp);
|
|
retval = (endptr[0] == '\0');
|
|
break;
|
|
}
|
|
case OPTION_S32: {
|
|
long tmp = strtol(val, &endptr, 0);
|
|
*result_u32 = htonl(tmp);
|
|
retval = (endptr[0] == '\0');
|
|
break;
|
|
}
|
|
case OPTION_BIN: /* handled in attach_option() */
|
|
opt = val;
|
|
retval = 1;
|
|
default:
|
|
break;
|
|
}
|
|
if (retval)
|
|
attach_option(opt_list, optflag, opt, length);
|
|
} while (retval && optflag->flags & OPTION_LIST);
|
|
|
|
return retval;
|
|
}
|
|
|
|
/* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
|
|
int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
|
|
{
|
|
char hexstrbuf[16 * 2];
|
|
bin2hex(hexstrbuf, (void*)ip, 16);
|
|
return sprintf(dest, /* "%s" */
|
|
"%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
|
|
/* pre, */
|
|
hexstrbuf + 0 * 4,
|
|
hexstrbuf + 1 * 4,
|
|
hexstrbuf + 2 * 4,
|
|
hexstrbuf + 3 * 4,
|
|
hexstrbuf + 4 * 4,
|
|
hexstrbuf + 5 * 4,
|
|
hexstrbuf + 6 * 4,
|
|
hexstrbuf + 7 * 4
|
|
);
|
|
}
|