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    Contents of /trunk/mkinitrd-magellan/busybox/networking/udhcp/options.c

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    Revision 816 - (show annotations) (download)
    Fri Apr 24 18:33:46 2009 UTC (15 years, 1 month ago) by niro
    File MIME type: text/plain
    File size: 8234 byte(s) 
    -updated to busybox-1.13.4
    1 /* vi: set sw=4 ts=4: */
    2 /*
    3 * options.c -- DHCP server option packet tools
    4 * Rewrite by Russ Dill <Russ.Dill@asu.edu> July 2001
    5 */
    6
    7 #include "common.h"
    8 #include "dhcpd.h"
    9 #include "options.h"
    10
    11
    12 /* Supported options are easily added here */
    13 const struct dhcp_option dhcp_options[] = {
    14 /* flags code */
    15 { OPTION_IP | OPTION_REQ, 0x01 }, /* DHCP_SUBNET */
    16 { OPTION_S32 , 0x02 }, /* DHCP_TIME_OFFSET */
    17 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x03 }, /* DHCP_ROUTER */
    18 { OPTION_IP | OPTION_LIST , 0x04 }, /* DHCP_TIME_SERVER */
    19 { OPTION_IP | OPTION_LIST , 0x05 }, /* DHCP_NAME_SERVER */
    20 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x06 }, /* DHCP_DNS_SERVER */
    21 { OPTION_IP | OPTION_LIST , 0x07 }, /* DHCP_LOG_SERVER */
    22 { OPTION_IP | OPTION_LIST , 0x08 }, /* DHCP_COOKIE_SERVER */
    23 { OPTION_IP | OPTION_LIST , 0x09 }, /* DHCP_LPR_SERVER */
    24 { OPTION_STRING | OPTION_REQ, 0x0c }, /* DHCP_HOST_NAME */
    25 { OPTION_U16 , 0x0d }, /* DHCP_BOOT_SIZE */
    26 { OPTION_STRING | OPTION_LIST | OPTION_REQ, 0x0f }, /* DHCP_DOMAIN_NAME */
    27 { OPTION_IP , 0x10 }, /* DHCP_SWAP_SERVER */
    28 { OPTION_STRING , 0x11 }, /* DHCP_ROOT_PATH */
    29 { OPTION_U8 , 0x17 }, /* DHCP_IP_TTL */
    30 { OPTION_U16 , 0x1a }, /* DHCP_MTU */
    31 { OPTION_IP | OPTION_REQ, 0x1c }, /* DHCP_BROADCAST */
    32 { OPTION_STRING , 0x28 }, /* nisdomain */
    33 { OPTION_IP | OPTION_LIST , 0x29 }, /* nissrv */
    34 { OPTION_IP | OPTION_LIST | OPTION_REQ, 0x2a }, /* DHCP_NTP_SERVER */
    35 { OPTION_IP | OPTION_LIST , 0x2c }, /* DHCP_WINS_SERVER */
    36 { OPTION_IP , 0x32 }, /* DHCP_REQUESTED_IP */
    37 { OPTION_U32 , 0x33 }, /* DHCP_LEASE_TIME */
    38 { OPTION_U8 , 0x35 }, /* dhcptype */
    39 { OPTION_IP , 0x36 }, /* DHCP_SERVER_ID */
    40 { OPTION_STRING , 0x38 }, /* DHCP_MESSAGE */
    41 { OPTION_STRING , 0x3C }, /* DHCP_VENDOR */
    42 { OPTION_STRING , 0x3D }, /* DHCP_CLIENT_ID */
    43 { OPTION_STRING , 0x42 }, /* tftp */
    44 { OPTION_STRING , 0x43 }, /* bootfile */
    45 { OPTION_STRING , 0x4D }, /* userclass */
    46 #if ENABLE_FEATURE_UDHCP_RFC3397
    47 { OPTION_STR1035 | OPTION_LIST , 0x77 }, /* search */
    48 #endif
    49 /* MSIE's "Web Proxy Autodiscovery Protocol" support */
    50 { OPTION_STRING , 0xfc }, /* wpad */
    51
    52 /* Options below have no match in dhcp_option_strings[],
    53 * are not passed to dhcpc scripts, and cannot be specified
    54 * with "option XXX YYY" syntax in dhcpd config file. */
    55
    56 { OPTION_U16 , 0x39 }, /* DHCP_MAX_SIZE */
    57 { } /* zeroed terminating entry */
    58 };
    59
    60 /* Used for converting options from incoming packets to env variables
    61 * for udhcpc stript */
    62 /* Must match dhcp_options[] order */
    63 const char dhcp_option_strings[] ALIGN1 =
    64 "subnet" "\0" /* DHCP_SUBNET */
    65 "timezone" "\0" /* DHCP_TIME_OFFSET */
    66 "router" "\0" /* DHCP_ROUTER */
    67 "timesrv" "\0" /* DHCP_TIME_SERVER */
    68 "namesrv" "\0" /* DHCP_NAME_SERVER */
    69 "dns" "\0" /* DHCP_DNS_SERVER */
    70 "logsrv" "\0" /* DHCP_LOG_SERVER */
    71 "cookiesrv" "\0" /* DHCP_COOKIE_SERVER */
    72 "lprsrv" "\0" /* DHCP_LPR_SERVER */
    73 "hostname" "\0" /* DHCP_HOST_NAME */
    74 "bootsize" "\0" /* DHCP_BOOT_SIZE */
    75 "domain" "\0" /* DHCP_DOMAIN_NAME */
    76 "swapsrv" "\0" /* DHCP_SWAP_SERVER */
    77 "rootpath" "\0" /* DHCP_ROOT_PATH */
    78 "ipttl" "\0" /* DHCP_IP_TTL */
    79 "mtu" "\0" /* DHCP_MTU */
    80 "broadcast" "\0" /* DHCP_BROADCAST */
    81 "nisdomain" "\0" /* */
    82 "nissrv" "\0" /* */
    83 "ntpsrv" "\0" /* DHCP_NTP_SERVER */
    84 "wins" "\0" /* DHCP_WINS_SERVER */
    85 "requestip" "\0" /* DHCP_REQUESTED_IP */
    86 "lease" "\0" /* DHCP_LEASE_TIME */
    87 "dhcptype" "\0" /* */
    88 "serverid" "\0" /* DHCP_SERVER_ID */
    89 "message" "\0" /* DHCP_MESSAGE */
    90 "vendorclass" "\0" /* DHCP_VENDOR */
    91 "clientid" "\0" /* DHCP_CLIENT_ID */
    92 "tftp" "\0"
    93 "bootfile" "\0"
    94 "userclass" "\0"
    95 #if ENABLE_FEATURE_UDHCP_RFC3397
    96 "search" "\0"
    97 #endif
    98 /* MSIE's "Web Proxy Autodiscovery Protocol" support */
    99 "wpad" "\0"
    100 ;
    101
    102
    103 /* Lengths of the different option types */
    104 const uint8_t dhcp_option_lengths[] ALIGN1 = {
    105 [OPTION_IP] = 4,
    106 [OPTION_IP_PAIR] = 8,
    107 [OPTION_BOOLEAN] = 1,
    108 [OPTION_STRING] = 1,
    109 #if ENABLE_FEATURE_UDHCP_RFC3397
    110 [OPTION_STR1035] = 1,
    111 #endif
    112 [OPTION_U8] = 1,
    113 [OPTION_U16] = 2,
    114 [OPTION_S16] = 2,
    115 [OPTION_U32] = 4,
    116 [OPTION_S32] = 4
    117 };
    118
    119
    120 /* get an option with bounds checking (warning, not aligned). */
    121 uint8_t* FAST_FUNC get_option(struct dhcpMessage *packet, int code)
    122 {
    123 int i, length;
    124 uint8_t *optionptr;
    125 int over = 0;
    126 int curr = OPTION_FIELD;
    127
    128 optionptr = packet->options;
    129 i = 0;
    130 length = sizeof(packet->options);
    131 while (1) {
    132 if (i >= length) {
    133 bb_error_msg("bogus packet, option fields too long");
    134 return NULL;
    135 }
    136 if (optionptr[i + OPT_CODE] == code) {
    137 if (i + 1 + optionptr[i + OPT_LEN] >= length) {
    138 bb_error_msg("bogus packet, option fields too long");
    139 return NULL;
    140 }
    141 return optionptr + i + 2;
    142 }
    143 switch (optionptr[i + OPT_CODE]) {
    144 case DHCP_PADDING:
    145 i++;
    146 break;
    147 case DHCP_OPTION_OVER:
    148 if (i + 1 + optionptr[i + OPT_LEN] >= length) {
    149 bb_error_msg("bogus packet, option fields too long");
    150 return NULL;
    151 }
    152 over = optionptr[i + 3];
    153 i += optionptr[OPT_LEN] + 2;
    154 break;
    155 case DHCP_END:
    156 if (curr == OPTION_FIELD && (over & FILE_FIELD)) {
    157 optionptr = packet->file;
    158 i = 0;
    159 length = sizeof(packet->file);
    160 curr = FILE_FIELD;
    161 } else if (curr == FILE_FIELD && (over & SNAME_FIELD)) {
    162 optionptr = packet->sname;
    163 i = 0;
    164 length = sizeof(packet->sname);
    165 curr = SNAME_FIELD;
    166 } else
    167 return NULL;
    168 break;
    169 default:
    170 i += optionptr[OPT_LEN + i] + 2;
    171 }
    172 }
    173 return NULL;
    174 }
    175
    176
    177 /* return the position of the 'end' option (no bounds checking) */
    178 int FAST_FUNC end_option(uint8_t *optionptr)
    179 {
    180 int i = 0;
    181
    182 while (optionptr[i] != DHCP_END) {
    183 if (optionptr[i] == DHCP_PADDING)
    184 i++;
    185 else
    186 i += optionptr[i + OPT_LEN] + 2;
    187 }
    188 return i;
    189 }
    190
    191
    192 /* add an option string to the options (an option string contains an option code,
    193 * length, then data) */
    194 int FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string)
    195 {
    196 int end = end_option(optionptr);
    197
    198 /* end position + string length + option code/length + end option */
    199 if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) {
    200 bb_error_msg("option 0x%02x did not fit into the packet",
    201 string[OPT_CODE]);
    202 return 0;
    203 }
    204 DEBUG("adding option 0x%02x", string[OPT_CODE]);
    205 memcpy(optionptr + end, string, string[OPT_LEN] + 2);
    206 optionptr[end + string[OPT_LEN] + 2] = DHCP_END;
    207 return string[OPT_LEN] + 2;
    208 }
    209
    210
    211 /* add a one to four byte option to a packet */
    212 int FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
    213 {
    214 const struct dhcp_option *dh;
    215
    216 for (dh = dhcp_options; dh->code; dh++) {
    217 if (dh->code == code) {
    218 uint8_t option[6], len;
    219
    220 option[OPT_CODE] = code;
    221 len = dhcp_option_lengths[dh->flags & TYPE_MASK];
    222 option[OPT_LEN] = len;
    223 if (BB_BIG_ENDIAN)
    224 data <<= 8 * (4 - len);
    225 /* This memcpy is for processors which can't
    226 * handle a simple unaligned 32-bit assignment */
    227 memcpy(&option[OPT_DATA], &data, 4);
    228 return add_option_string(optionptr, option);
    229 }
    230 }
    231
    232 bb_error_msg("cannot add option 0x%02x", code);
    233 return 0;
    234 }