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

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    Revision 816 - (hide 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 niro 532 /* 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 niro 816 /* Supported options are easily added here */
    13 niro 532 const struct dhcp_option dhcp_options[] = {
    14 niro 816 /* 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 niro 532 /* MSIE's "Web Proxy Autodiscovery Protocol" support */
    50 niro 816 { 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 niro 532 };
    59    
    60 niro 816 /* 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 niro 532 /* Lengths of the different option types */
    104 niro 816 const uint8_t dhcp_option_lengths[] ALIGN1 = {
    105 niro 532 [OPTION_IP] = 4,
    106     [OPTION_IP_PAIR] = 8,
    107     [OPTION_BOOLEAN] = 1,
    108     [OPTION_STRING] = 1,
    109 niro 816 #if ENABLE_FEATURE_UDHCP_RFC3397
    110     [OPTION_STR1035] = 1,
    111     #endif
    112 niro 532 [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 niro 816 uint8_t* FAST_FUNC get_option(struct dhcpMessage *packet, int code)
    122 niro 532 {
    123     int i, length;
    124     uint8_t *optionptr;
    125 niro 816 int over = 0;
    126     int curr = OPTION_FIELD;
    127 niro 532
    128     optionptr = packet->options;
    129     i = 0;
    130 niro 816 length = sizeof(packet->options);
    131     while (1) {
    132 niro 532 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 niro 816 if (curr == OPTION_FIELD && (over & FILE_FIELD)) {
    157 niro 532 optionptr = packet->file;
    158     i = 0;
    159 niro 816 length = sizeof(packet->file);
    160 niro 532 curr = FILE_FIELD;
    161 niro 816 } else if (curr == FILE_FIELD && (over & SNAME_FIELD)) {
    162 niro 532 optionptr = packet->sname;
    163     i = 0;
    164 niro 816 length = sizeof(packet->sname);
    165 niro 532 curr = SNAME_FIELD;
    166 niro 816 } else
    167     return NULL;
    168 niro 532 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 niro 816 int FAST_FUNC end_option(uint8_t *optionptr)
    179 niro 532 {
    180     int i = 0;
    181    
    182     while (optionptr[i] != DHCP_END) {
    183 niro 816 if (optionptr[i] == DHCP_PADDING)
    184     i++;
    185     else
    186     i += optionptr[i + OPT_LEN] + 2;
    187 niro 532 }
    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 niro 816 int FAST_FUNC add_option_string(uint8_t *optionptr, uint8_t *string)
    195 niro 532 {
    196     int end = end_option(optionptr);
    197    
    198     /* end position + string length + option code/length + end option */
    199 niro 816 if (end + string[OPT_LEN] + 2 + 1 >= DHCP_OPTIONS_BUFSIZE) {
    200 niro 532 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 niro 816 int FAST_FUNC add_simple_option(uint8_t *optionptr, uint8_t code, uint32_t data)
    213 niro 532 {
    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 niro 816 len = dhcp_option_lengths[dh->flags & TYPE_MASK];
    222 niro 532 option[OPT_LEN] = len;
    223 niro 816 if (BB_BIG_ENDIAN)
    224     data <<= 8 * (4 - len);
    225     /* This memcpy is for processors which can't
    226 niro 532 * 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     }