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