[821] | 1 | /* vi: set sw=4 ts=4: */
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[2725] | 2 | /*
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| 3 | * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
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[821] | 4 | *
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[2725] | 5 | * Licensed under GPLv2, see file LICENSE in this source tree.
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[821] | 6 | */
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| 7 | #include "common.h"
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| 8 |
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[2725] | 9 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1
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| 10 | unsigned dhcp_verbose;
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| 11 | #endif
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| 12 |
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[1765] | 13 | const uint8_t MAC_BCAST_ADDR[6] ALIGN2 = {
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| 14 | 0xff, 0xff, 0xff, 0xff, 0xff, 0xff
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[821] | 15 | };
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[2725] | 16 |
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| 17 | /* Supported options are easily added here.
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| 18 | * See RFC2132 for more options.
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| 19 | * OPTION_REQ: these options are requested by udhcpc (unless -o).
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| 20 | */
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| 21 | const struct dhcp_optflag dhcp_optflags[] = {
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| 22 | /* flags code */
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| 23 | { OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
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| 24 | { OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
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| 25 | { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
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| 26 | // { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
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| 27 | // { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
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| 28 | { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
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| 29 | // { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
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| 30 | // { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
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| 31 | { OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
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[3232] | 32 | { OPTION_STRING_HOST | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
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[2725] | 33 | { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
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[3232] | 34 | { OPTION_STRING_HOST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
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[2725] | 35 | { OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
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| 36 | { OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
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| 37 | { OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
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| 38 | { OPTION_U16 , 0x1a }, /* DHCP_MTU */
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[3232] | 39 | //TODO: why do we request DHCP_BROADCAST? Can't we assume that
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| 40 | //in the unlikely case it is different from typical N.N.255.255,
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| 41 | //server would let us know anyway?
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[2725] | 42 | { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
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| 43 | { OPTION_IP_PAIR | OPTION_LIST , 0x21 }, /* DHCP_ROUTES */
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[3232] | 44 | { OPTION_STRING_HOST , 0x28 }, /* DHCP_NIS_DOMAIN */
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[2725] | 45 | { OPTION_IP | OPTION_LIST , 0x29 }, /* DHCP_NIS_SERVER */
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| 46 | { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
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| 47 | { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
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| 48 | { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */
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| 49 | { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
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| 50 | { OPTION_STRING , 0x38 }, /* DHCP_ERR_MESSAGE */
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| 51 | //TODO: must be combined with 'sname' and 'file' handling:
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[3232] | 52 | { OPTION_STRING_HOST , 0x42 }, /* DHCP_TFTP_SERVER_NAME */
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[2725] | 53 | { OPTION_STRING , 0x43 }, /* DHCP_BOOT_FILE */
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| 54 | //TODO: not a string, but a set of LASCII strings:
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| 55 | // { OPTION_STRING , 0x4D }, /* DHCP_USER_CLASS */
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| 56 | #if ENABLE_FEATURE_UDHCP_RFC3397
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| 57 | { OPTION_DNS_STRING | OPTION_LIST , 0x77 }, /* DHCP_DOMAIN_SEARCH */
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| 58 | { OPTION_SIP_SERVERS , 0x78 }, /* DHCP_SIP_SERVERS */
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| 59 | #endif
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[3232] | 60 | { OPTION_STATIC_ROUTES | OPTION_LIST , 0x79 }, /* DHCP_STATIC_ROUTES */
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| 61 | #if ENABLE_FEATURE_UDHCP_8021Q
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| 62 | { OPTION_U16 , 0x84 }, /* DHCP_VLAN_ID */
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| 63 | { OPTION_U8 , 0x85 }, /* DHCP_VLAN_PRIORITY */
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| 64 | #endif
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[3621] | 65 | { OPTION_STRING , 0xd1 }, /* DHCP_PXE_CONF_FILE */
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| 66 | { OPTION_STRING , 0xd2 }, /* DHCP_PXE_PATH_PREFIX */
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[3232] | 67 | { OPTION_6RD , 0xd4 }, /* DHCP_6RD */
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| 68 | { OPTION_STATIC_ROUTES | OPTION_LIST , 0xf9 }, /* DHCP_MS_STATIC_ROUTES */
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[2725] | 69 | { OPTION_STRING , 0xfc }, /* DHCP_WPAD */
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| 70 |
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| 71 | /* Options below have no match in dhcp_option_strings[],
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| 72 | * are not passed to dhcpc scripts, and cannot be specified
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| 73 | * with "option XXX YYY" syntax in dhcpd config file.
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| 74 | * These entries are only used internally by udhcp[cd]
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| 75 | * to correctly encode options into packets.
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| 76 | */
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| 77 |
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| 78 | { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
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| 79 | { OPTION_U8 , 0x35 }, /* DHCP_MESSAGE_TYPE */
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| 80 | { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
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| 81 | //looks like these opts will work just fine even without these defs:
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| 82 | // { OPTION_STRING , 0x3c }, /* DHCP_VENDOR */
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| 83 | // /* not really a string: */
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| 84 | // { OPTION_STRING , 0x3d }, /* DHCP_CLIENT_ID */
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| 85 | { 0, 0 } /* zeroed terminating entry */
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| 86 | };
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| 87 |
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| 88 | /* Used for converting options from incoming packets to env variables
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| 89 | * for udhcpc stript, and for setting options for udhcpd via
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| 90 | * "opt OPTION_NAME OPTION_VALUE" directives in udhcpd.conf file.
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| 91 | */
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| 92 | /* Must match dhcp_optflags[] order */
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| 93 | const char dhcp_option_strings[] ALIGN1 =
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| 94 | "subnet" "\0" /* DHCP_SUBNET */
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| 95 | "timezone" "\0" /* DHCP_TIME_OFFSET */
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| 96 | "router" "\0" /* DHCP_ROUTER */
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| 97 | // "timesrv" "\0" /* DHCP_TIME_SERVER */
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| 98 | // "namesrv" "\0" /* DHCP_NAME_SERVER */
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| 99 | "dns" "\0" /* DHCP_DNS_SERVER */
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| 100 | // "logsrv" "\0" /* DHCP_LOG_SERVER */
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| 101 | // "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
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| 102 | "lprsrv" "\0" /* DHCP_LPR_SERVER */
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| 103 | "hostname" "\0" /* DHCP_HOST_NAME */
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| 104 | "bootsize" "\0" /* DHCP_BOOT_SIZE */
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| 105 | "domain" "\0" /* DHCP_DOMAIN_NAME */
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| 106 | "swapsrv" "\0" /* DHCP_SWAP_SERVER */
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| 107 | "rootpath" "\0" /* DHCP_ROOT_PATH */
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| 108 | "ipttl" "\0" /* DHCP_IP_TTL */
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| 109 | "mtu" "\0" /* DHCP_MTU */
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| 110 | "broadcast" "\0" /* DHCP_BROADCAST */
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| 111 | "routes" "\0" /* DHCP_ROUTES */
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| 112 | "nisdomain" "\0" /* DHCP_NIS_DOMAIN */
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| 113 | "nissrv" "\0" /* DHCP_NIS_SERVER */
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| 114 | "ntpsrv" "\0" /* DHCP_NTP_SERVER */
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| 115 | "wins" "\0" /* DHCP_WINS_SERVER */
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| 116 | "lease" "\0" /* DHCP_LEASE_TIME */
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| 117 | "serverid" "\0" /* DHCP_SERVER_ID */
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| 118 | "message" "\0" /* DHCP_ERR_MESSAGE */
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| 119 | "tftp" "\0" /* DHCP_TFTP_SERVER_NAME */
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| 120 | "bootfile" "\0" /* DHCP_BOOT_FILE */
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| 121 | // "userclass" "\0" /* DHCP_USER_CLASS */
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| 122 | #if ENABLE_FEATURE_UDHCP_RFC3397
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| 123 | "search" "\0" /* DHCP_DOMAIN_SEARCH */
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| 124 | // doesn't work in udhcpd.conf since OPTION_SIP_SERVERS
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| 125 | // is not handled yet by "string->option" conversion code:
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| 126 | "sipsrv" "\0" /* DHCP_SIP_SERVERS */
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| 127 | #endif
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| 128 | "staticroutes" "\0"/* DHCP_STATIC_ROUTES */
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[3232] | 129 | #if ENABLE_FEATURE_UDHCP_8021Q
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| 130 | "vlanid" "\0" /* DHCP_VLAN_ID */
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| 131 | "vlanpriority" "\0"/* DHCP_VLAN_PRIORITY */
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| 132 | #endif
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[3621] | 133 | "pxeconffile" "\0" /* DHCP_PXE_CONF_FILE */
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| 134 | "pxepathprefix" "\0" /* DHCP_PXE_PATH_PREFIX */
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[3232] | 135 | "ip6rd" "\0" /* DHCP_6RD */
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[2725] | 136 | "msstaticroutes""\0"/* DHCP_MS_STATIC_ROUTES */
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| 137 | "wpad" "\0" /* DHCP_WPAD */
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| 138 | ;
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| 139 |
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| 140 | /* Lengths of the option types in binary form.
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| 141 | * Used by:
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| 142 | * udhcp_str2optset: to determine how many bytes to allocate.
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| 143 | * xmalloc_optname_optval: to estimate string length
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| 144 | * from binary option length: (option[LEN] / dhcp_option_lengths[opt_type])
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[3621] | 145 | * is the number of elements, multiply it by one element's string width
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[2725] | 146 | * (len_of_option_as_string[opt_type]) and you know how wide string you need.
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| 147 | */
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| 148 | const uint8_t dhcp_option_lengths[] ALIGN1 = {
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| 149 | [OPTION_IP] = 4,
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| 150 | [OPTION_IP_PAIR] = 8,
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| 151 | // [OPTION_BOOLEAN] = 1,
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| 152 | [OPTION_STRING] = 1, /* ignored by udhcp_str2optset */
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[3232] | 153 | [OPTION_STRING_HOST] = 1, /* ignored by udhcp_str2optset */
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[2725] | 154 | #if ENABLE_FEATURE_UDHCP_RFC3397
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| 155 | [OPTION_DNS_STRING] = 1, /* ignored by both udhcp_str2optset and xmalloc_optname_optval */
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| 156 | [OPTION_SIP_SERVERS] = 1,
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| 157 | #endif
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| 158 | [OPTION_U8] = 1,
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| 159 | [OPTION_U16] = 2,
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| 160 | // [OPTION_S16] = 2,
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| 161 | [OPTION_U32] = 4,
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| 162 | [OPTION_S32] = 4,
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| 163 | /* Just like OPTION_STRING, we use minimum length here */
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| 164 | [OPTION_STATIC_ROUTES] = 5,
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[3621] | 165 | [OPTION_6RD] = 12, /* ignored by udhcp_str2optset */
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| 166 | /* The above value was chosen as follows:
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| 167 | * len_of_option_as_string[] for this option is >60: it's a string of the form
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| 168 | * "32 128 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 255.255.255.255 ".
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| 169 | * Each additional ipv4 address takes 4 bytes in binary option and appends
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| 170 | * another "255.255.255.255 " 16-byte string. We can set [OPTION_6RD] = 4
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| 171 | * but this severely overestimates string length: instead of 16 bytes,
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| 172 | * it adds >60 for every 4 bytes in binary option.
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| 173 | * We cheat and declare here that option is in units of 12 bytes.
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| 174 | * This adds more than 60 bytes for every three ipv4 addresses - more than enough.
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| 175 | * (Even 16 instead of 12 should work, but let's be paranoid).
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| 176 | */
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[2725] | 177 | };
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| 178 |
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| 179 |
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| 180 | #if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 2
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| 181 | static void log_option(const char *pfx, const uint8_t *opt)
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| 182 | {
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| 183 | if (dhcp_verbose >= 2) {
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| 184 | char buf[256 * 2 + 2];
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| 185 | *bin2hex(buf, (void*) (opt + OPT_DATA), opt[OPT_LEN]) = '\0';
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[3621] | 186 | bb_error_msg("%s: 0x%02x %s", pfx, opt[OPT_CODE], buf);
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[2725] | 187 | }
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| 188 | }
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| 189 | #else
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| 190 | # define log_option(pfx, opt) ((void)0)
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| 191 | #endif
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| 192 |
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| 193 | unsigned FAST_FUNC udhcp_option_idx(const char *name)
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| 194 | {
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| 195 | int n = index_in_strings(dhcp_option_strings, name);
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| 196 | if (n >= 0)
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| 197 | return n;
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| 198 |
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| 199 | {
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| 200 | char buf[sizeof(dhcp_option_strings)];
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| 201 | char *d = buf;
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| 202 | const char *s = dhcp_option_strings;
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| 203 | while (s < dhcp_option_strings + sizeof(dhcp_option_strings) - 2) {
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| 204 | *d++ = (*s == '\0' ? ' ' : *s);
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| 205 | s++;
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| 206 | }
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| 207 | *d = '\0';
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| 208 | bb_error_msg_and_die("unknown option '%s', known options: %s", name, buf);
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| 209 | }
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| 210 | }
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| 211 |
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| 212 | /* Get an option with bounds checking (warning, result is not aligned) */
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| 213 | uint8_t* FAST_FUNC udhcp_get_option(struct dhcp_packet *packet, int code)
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| 214 | {
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| 215 | uint8_t *optionptr;
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| 216 | int len;
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| 217 | int rem;
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| 218 | int overload = 0;
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| 219 | enum {
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| 220 | FILE_FIELD101 = FILE_FIELD * 0x101,
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| 221 | SNAME_FIELD101 = SNAME_FIELD * 0x101,
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| 222 | };
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| 223 |
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| 224 | /* option bytes: [code][len][data1][data2]..[dataLEN] */
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| 225 | optionptr = packet->options;
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| 226 | rem = sizeof(packet->options);
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| 227 | while (1) {
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| 228 | if (rem <= 0) {
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| 229 | bb_error_msg("bad packet, malformed option field");
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| 230 | return NULL;
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| 231 | }
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| 232 | if (optionptr[OPT_CODE] == DHCP_PADDING) {
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| 233 | rem--;
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| 234 | optionptr++;
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| 235 | continue;
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| 236 | }
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| 237 | if (optionptr[OPT_CODE] == DHCP_END) {
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| 238 | if ((overload & FILE_FIELD101) == FILE_FIELD) {
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| 239 | /* can use packet->file, and didn't look at it yet */
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| 240 | overload |= FILE_FIELD101; /* "we looked at it" */
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| 241 | optionptr = packet->file;
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| 242 | rem = sizeof(packet->file);
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| 243 | continue;
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| 244 | }
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| 245 | if ((overload & SNAME_FIELD101) == SNAME_FIELD) {
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| 246 | /* can use packet->sname, and didn't look at it yet */
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| 247 | overload |= SNAME_FIELD101; /* "we looked at it" */
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| 248 | optionptr = packet->sname;
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| 249 | rem = sizeof(packet->sname);
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| 250 | continue;
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| 251 | }
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| 252 | break;
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| 253 | }
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| 254 | len = 2 + optionptr[OPT_LEN];
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| 255 | rem -= len;
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| 256 | if (rem < 0)
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| 257 | continue; /* complain and return NULL */
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| 258 |
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| 259 | if (optionptr[OPT_CODE] == code) {
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[3621] | 260 | log_option("option found", optionptr);
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[2725] | 261 | return optionptr + OPT_DATA;
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| 262 | }
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| 263 |
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| 264 | if (optionptr[OPT_CODE] == DHCP_OPTION_OVERLOAD) {
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| 265 | overload |= optionptr[OPT_DATA];
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| 266 | /* fall through */
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| 267 | }
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| 268 | optionptr += len;
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| 269 | }
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| 270 |
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| 271 | /* log3 because udhcpc uses it a lot - very noisy */
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[3621] | 272 | log3("option 0x%02x not found", code);
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[2725] | 273 | return NULL;
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| 274 | }
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| 275 |
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| 276 | /* Return the position of the 'end' option (no bounds checking) */
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| 277 | int FAST_FUNC udhcp_end_option(uint8_t *optionptr)
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| 278 | {
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| 279 | int i = 0;
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| 280 |
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| 281 | while (optionptr[i] != DHCP_END) {
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| 282 | if (optionptr[i] != DHCP_PADDING)
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| 283 | i += optionptr[i + OPT_LEN] + OPT_DATA-1;
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| 284 | i++;
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| 285 | }
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| 286 | return i;
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| 287 | }
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| 288 |
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| 289 | /* Add an option (supplied in binary form) to the options.
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| 290 | * Option format: [code][len][data1][data2]..[dataLEN]
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| 291 | */
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| 292 | void FAST_FUNC udhcp_add_binary_option(struct dhcp_packet *packet, uint8_t *addopt)
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| 293 | {
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| 294 | unsigned len;
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| 295 | uint8_t *optionptr = packet->options;
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| 296 | unsigned end = udhcp_end_option(optionptr);
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| 297 |
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| 298 | len = OPT_DATA + addopt[OPT_LEN];
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| 299 | /* end position + (option code/length + addopt length) + end option */
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| 300 | if (end + len + 1 >= DHCP_OPTIONS_BUFSIZE) {
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| 301 | //TODO: learn how to use overflow option if we exhaust packet->options[]
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| 302 | bb_error_msg("option 0x%02x did not fit into the packet",
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| 303 | addopt[OPT_CODE]);
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| 304 | return;
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| 305 | }
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[3621] | 306 | log_option("adding option", addopt);
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[2725] | 307 | memcpy(optionptr + end, addopt, len);
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| 308 | optionptr[end + len] = DHCP_END;
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| 309 | }
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| 310 |
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| 311 | /* Add an one to four byte option to a packet */
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| 312 | void FAST_FUNC udhcp_add_simple_option(struct dhcp_packet *packet, uint8_t code, uint32_t data)
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| 313 | {
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| 314 | const struct dhcp_optflag *dh;
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| 315 |
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| 316 | for (dh = dhcp_optflags; dh->code; dh++) {
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| 317 | if (dh->code == code) {
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| 318 | uint8_t option[6], len;
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| 319 |
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| 320 | option[OPT_CODE] = code;
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| 321 | len = dhcp_option_lengths[dh->flags & OPTION_TYPE_MASK];
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| 322 | option[OPT_LEN] = len;
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| 323 | if (BB_BIG_ENDIAN)
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| 324 | data <<= 8 * (4 - len);
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| 325 | /* Assignment is unaligned! */
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| 326 | move_to_unaligned32(&option[OPT_DATA], data);
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| 327 | udhcp_add_binary_option(packet, option);
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| 328 | return;
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| 329 | }
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| 330 | }
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| 331 |
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| 332 | bb_error_msg("can't add option 0x%02x", code);
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| 333 | }
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| 334 |
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| 335 | /* Find option 'code' in opt_list */
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| 336 | struct option_set* FAST_FUNC udhcp_find_option(struct option_set *opt_list, uint8_t code)
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| 337 | {
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| 338 | while (opt_list && opt_list->data[OPT_CODE] < code)
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| 339 | opt_list = opt_list->next;
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| 340 |
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| 341 | if (opt_list && opt_list->data[OPT_CODE] == code)
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| 342 | return opt_list;
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| 343 | return NULL;
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| 344 | }
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| 345 |
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| 346 | /* Parse string to IP in network order */
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| 347 | int FAST_FUNC udhcp_str2nip(const char *str, void *arg)
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| 348 | {
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| 349 | len_and_sockaddr *lsa;
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| 350 |
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| 351 | lsa = host_and_af2sockaddr(str, 0, AF_INET);
|
---|
| 352 | if (!lsa)
|
---|
| 353 | return 0;
|
---|
[3232] | 354 | /* arg maybe unaligned */
|
---|
| 355 | move_to_unaligned32((uint32_t*)arg, lsa->u.sin.sin_addr.s_addr);
|
---|
[2725] | 356 | free(lsa);
|
---|
| 357 | return 1;
|
---|
| 358 | }
|
---|
| 359 |
|
---|
| 360 | /* udhcp_str2optset:
|
---|
| 361 | * Parse string option representation to binary form and add it to opt_list.
|
---|
| 362 | * Called to parse "udhcpc -x OPTNAME:OPTVAL"
|
---|
| 363 | * and to parse udhcpd.conf's "opt OPTNAME OPTVAL" directives.
|
---|
| 364 | */
|
---|
| 365 | /* helper for the helper */
|
---|
| 366 | static char *allocate_tempopt_if_needed(
|
---|
| 367 | const struct dhcp_optflag *optflag,
|
---|
| 368 | char *buffer,
|
---|
| 369 | int *length_p)
|
---|
| 370 | {
|
---|
| 371 | char *allocated = NULL;
|
---|
| 372 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_BIN) {
|
---|
| 373 | const char *end;
|
---|
| 374 | allocated = xstrdup(buffer); /* more than enough */
|
---|
| 375 | end = hex2bin(allocated, buffer, 255);
|
---|
| 376 | if (errno)
|
---|
| 377 | bb_error_msg_and_die("malformed hex string '%s'", buffer);
|
---|
| 378 | *length_p = end - allocated;
|
---|
| 379 | }
|
---|
| 380 | return allocated;
|
---|
| 381 | }
|
---|
| 382 | /* helper: add an option to the opt_list */
|
---|
| 383 | static NOINLINE void attach_option(
|
---|
| 384 | struct option_set **opt_list,
|
---|
| 385 | const struct dhcp_optflag *optflag,
|
---|
| 386 | char *buffer,
|
---|
| 387 | int length)
|
---|
| 388 | {
|
---|
[3621] | 389 | struct option_set *existing;
|
---|
| 390 | char *allocated;
|
---|
[2725] | 391 |
|
---|
[3621] | 392 | allocated = allocate_tempopt_if_needed(optflag, buffer, &length);
|
---|
| 393 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
| 394 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_DNS_STRING) {
|
---|
| 395 | /* reuse buffer and length for RFC1035-formatted string */
|
---|
| 396 | allocated = buffer = (char *)dname_enc(NULL, 0, buffer, &length);
|
---|
| 397 | }
|
---|
| 398 | #endif
|
---|
| 399 |
|
---|
[2725] | 400 | existing = udhcp_find_option(*opt_list, optflag->code);
|
---|
| 401 | if (!existing) {
|
---|
[3621] | 402 | struct option_set *new, **curr;
|
---|
| 403 |
|
---|
[2725] | 404 | /* make a new option */
|
---|
[3621] | 405 | log2("attaching option %02x to list", optflag->code);
|
---|
[2725] | 406 | new = xmalloc(sizeof(*new));
|
---|
| 407 | new->data = xmalloc(length + OPT_DATA);
|
---|
| 408 | new->data[OPT_CODE] = optflag->code;
|
---|
| 409 | new->data[OPT_LEN] = length;
|
---|
| 410 | memcpy(new->data + OPT_DATA, (allocated ? allocated : buffer), length);
|
---|
| 411 |
|
---|
| 412 | curr = opt_list;
|
---|
| 413 | while (*curr && (*curr)->data[OPT_CODE] < optflag->code)
|
---|
| 414 | curr = &(*curr)->next;
|
---|
| 415 |
|
---|
| 416 | new->next = *curr;
|
---|
| 417 | *curr = new;
|
---|
| 418 | goto ret;
|
---|
| 419 | }
|
---|
| 420 |
|
---|
| 421 | if (optflag->flags & OPTION_LIST) {
|
---|
| 422 | unsigned old_len;
|
---|
| 423 |
|
---|
| 424 | /* add it to an existing option */
|
---|
[3621] | 425 | log2("attaching option %02x to existing member of list", optflag->code);
|
---|
[2725] | 426 | old_len = existing->data[OPT_LEN];
|
---|
| 427 | if (old_len + length < 255) {
|
---|
| 428 | /* actually 255 is ok too, but adding a space can overlow it */
|
---|
| 429 |
|
---|
| 430 | existing->data = xrealloc(existing->data, OPT_DATA + 1 + old_len + length);
|
---|
[3232] | 431 | if ((optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING
|
---|
| 432 | || (optflag->flags & OPTION_TYPE_MASK) == OPTION_STRING_HOST
|
---|
| 433 | ) {
|
---|
[2725] | 434 | /* add space separator between STRING options in a list */
|
---|
| 435 | existing->data[OPT_DATA + old_len] = ' ';
|
---|
| 436 | old_len++;
|
---|
| 437 | }
|
---|
[3621] | 438 | memcpy(existing->data + OPT_DATA + old_len, (allocated ? allocated : buffer), length);
|
---|
[2725] | 439 | existing->data[OPT_LEN] = old_len + length;
|
---|
| 440 | } /* else, ignore the data, we could put this in a second option in the future */
|
---|
| 441 | } /* else, ignore the new data */
|
---|
| 442 |
|
---|
| 443 | ret:
|
---|
| 444 | free(allocated);
|
---|
| 445 | }
|
---|
| 446 |
|
---|
| 447 | int FAST_FUNC udhcp_str2optset(const char *const_str, void *arg)
|
---|
| 448 | {
|
---|
| 449 | struct option_set **opt_list = arg;
|
---|
[3232] | 450 | char *opt, *val;
|
---|
[2725] | 451 | char *str;
|
---|
| 452 | const struct dhcp_optflag *optflag;
|
---|
| 453 | struct dhcp_optflag bin_optflag;
|
---|
| 454 | unsigned optcode;
|
---|
| 455 | int retval, length;
|
---|
[3232] | 456 | /* IP_PAIR needs 8 bytes, STATIC_ROUTES needs 9 max */
|
---|
| 457 | char buffer[9] ALIGNED(4);
|
---|
[2725] | 458 | uint16_t *result_u16 = (uint16_t *) buffer;
|
---|
| 459 | uint32_t *result_u32 = (uint32_t *) buffer;
|
---|
| 460 |
|
---|
| 461 | /* Cheat, the only *const* str possible is "" */
|
---|
| 462 | str = (char *) const_str;
|
---|
| 463 | opt = strtok(str, " \t=");
|
---|
| 464 | if (!opt)
|
---|
| 465 | return 0;
|
---|
| 466 |
|
---|
| 467 | optcode = bb_strtou(opt, NULL, 0);
|
---|
| 468 | if (!errno && optcode < 255) {
|
---|
| 469 | /* Raw (numeric) option code */
|
---|
| 470 | bin_optflag.flags = OPTION_BIN;
|
---|
| 471 | bin_optflag.code = optcode;
|
---|
| 472 | optflag = &bin_optflag;
|
---|
| 473 | } else {
|
---|
| 474 | optflag = &dhcp_optflags[udhcp_option_idx(opt)];
|
---|
| 475 | }
|
---|
| 476 |
|
---|
| 477 | retval = 0;
|
---|
| 478 | do {
|
---|
| 479 | val = strtok(NULL, ", \t");
|
---|
| 480 | if (!val)
|
---|
| 481 | break;
|
---|
| 482 | length = dhcp_option_lengths[optflag->flags & OPTION_TYPE_MASK];
|
---|
| 483 | retval = 0;
|
---|
| 484 | opt = buffer; /* new meaning for variable opt */
|
---|
| 485 | switch (optflag->flags & OPTION_TYPE_MASK) {
|
---|
| 486 | case OPTION_IP:
|
---|
| 487 | retval = udhcp_str2nip(val, buffer);
|
---|
| 488 | break;
|
---|
| 489 | case OPTION_IP_PAIR:
|
---|
| 490 | retval = udhcp_str2nip(val, buffer);
|
---|
| 491 | val = strtok(NULL, ", \t/-");
|
---|
| 492 | if (!val)
|
---|
| 493 | retval = 0;
|
---|
| 494 | if (retval)
|
---|
| 495 | retval = udhcp_str2nip(val, buffer + 4);
|
---|
| 496 | break;
|
---|
| 497 | case OPTION_STRING:
|
---|
[3232] | 498 | case OPTION_STRING_HOST:
|
---|
[2725] | 499 | #if ENABLE_FEATURE_UDHCP_RFC3397
|
---|
| 500 | case OPTION_DNS_STRING:
|
---|
| 501 | #endif
|
---|
| 502 | length = strnlen(val, 254);
|
---|
| 503 | if (length > 0) {
|
---|
| 504 | opt = val;
|
---|
| 505 | retval = 1;
|
---|
| 506 | }
|
---|
| 507 | break;
|
---|
| 508 | // case OPTION_BOOLEAN: {
|
---|
| 509 | // static const char no_yes[] ALIGN1 = "no\0yes\0";
|
---|
| 510 | // buffer[0] = retval = index_in_strings(no_yes, val);
|
---|
| 511 | // retval++; /* 0 - bad; 1: "no" 2: "yes" */
|
---|
| 512 | // break;
|
---|
| 513 | // }
|
---|
| 514 | case OPTION_U8:
|
---|
[3232] | 515 | buffer[0] = bb_strtou32(val, NULL, 0);
|
---|
| 516 | retval = (errno == 0);
|
---|
[2725] | 517 | break;
|
---|
| 518 | /* htonX are macros in older libc's, using temp var
|
---|
| 519 | * in code below for safety */
|
---|
| 520 | /* TODO: use bb_strtoX? */
|
---|
| 521 | case OPTION_U16: {
|
---|
[3232] | 522 | uint32_t tmp = bb_strtou32(val, NULL, 0);
|
---|
[2725] | 523 | *result_u16 = htons(tmp);
|
---|
[3232] | 524 | retval = (errno == 0 /*&& tmp < 0x10000*/);
|
---|
[2725] | 525 | break;
|
---|
| 526 | }
|
---|
| 527 | // case OPTION_S16: {
|
---|
[3232] | 528 | // long tmp = bb_strtoi32(val, NULL, 0);
|
---|
[2725] | 529 | // *result_u16 = htons(tmp);
|
---|
[3232] | 530 | // retval = (errno == 0);
|
---|
[2725] | 531 | // break;
|
---|
| 532 | // }
|
---|
| 533 | case OPTION_U32: {
|
---|
[3232] | 534 | uint32_t tmp = bb_strtou32(val, NULL, 0);
|
---|
[2725] | 535 | *result_u32 = htonl(tmp);
|
---|
[3232] | 536 | retval = (errno == 0);
|
---|
[2725] | 537 | break;
|
---|
| 538 | }
|
---|
| 539 | case OPTION_S32: {
|
---|
[3232] | 540 | int32_t tmp = bb_strtoi32(val, NULL, 0);
|
---|
[2725] | 541 | *result_u32 = htonl(tmp);
|
---|
[3232] | 542 | retval = (errno == 0);
|
---|
[2725] | 543 | break;
|
---|
| 544 | }
|
---|
[3232] | 545 | case OPTION_STATIC_ROUTES: {
|
---|
| 546 | /* Input: "a.b.c.d/m" */
|
---|
| 547 | /* Output: mask(1 byte),pfx(0-4 bytes),gw(4 bytes) */
|
---|
| 548 | unsigned mask;
|
---|
| 549 | char *slash = strchr(val, '/');
|
---|
| 550 | if (slash) {
|
---|
| 551 | *slash = '\0';
|
---|
| 552 | retval = udhcp_str2nip(val, buffer + 1);
|
---|
| 553 | buffer[0] = mask = bb_strtou(slash + 1, NULL, 10);
|
---|
| 554 | val = strtok(NULL, ", \t/-");
|
---|
| 555 | if (!val || mask > 32 || errno)
|
---|
| 556 | retval = 0;
|
---|
| 557 | if (retval) {
|
---|
| 558 | length = ((mask + 7) >> 3) + 5;
|
---|
| 559 | retval = udhcp_str2nip(val, buffer + (length - 4));
|
---|
| 560 | }
|
---|
| 561 | }
|
---|
| 562 | break;
|
---|
| 563 | }
|
---|
[2725] | 564 | case OPTION_BIN: /* handled in attach_option() */
|
---|
| 565 | opt = val;
|
---|
| 566 | retval = 1;
|
---|
| 567 | default:
|
---|
| 568 | break;
|
---|
| 569 | }
|
---|
| 570 | if (retval)
|
---|
| 571 | attach_option(opt_list, optflag, opt, length);
|
---|
[3232] | 572 | } while (retval && (optflag->flags & OPTION_LIST));
|
---|
[2725] | 573 |
|
---|
| 574 | return retval;
|
---|
| 575 | }
|
---|
[3232] | 576 |
|
---|
| 577 | /* note: ip is a pointer to an IPv6 in network order, possibly misaliged */
|
---|
| 578 | int FAST_FUNC sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip)
|
---|
| 579 | {
|
---|
| 580 | char hexstrbuf[16 * 2];
|
---|
| 581 | bin2hex(hexstrbuf, (void*)ip, 16);
|
---|
| 582 | return sprintf(dest, /* "%s" */
|
---|
| 583 | "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s",
|
---|
| 584 | /* pre, */
|
---|
| 585 | hexstrbuf + 0 * 4,
|
---|
| 586 | hexstrbuf + 1 * 4,
|
---|
| 587 | hexstrbuf + 2 * 4,
|
---|
| 588 | hexstrbuf + 3 * 4,
|
---|
| 589 | hexstrbuf + 4 * 4,
|
---|
| 590 | hexstrbuf + 5 * 4,
|
---|
| 591 | hexstrbuf + 6 * 4,
|
---|
| 592 | hexstrbuf + 7 * 4
|
---|
| 593 | );
|
---|
| 594 | }
|
---|