1 | /* vi: set sw=4 ts=4: */
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2 | /* dhcpc.c
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3 | *
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4 | * udhcp DHCP client
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5 | *
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6 | * Russ Dill <Russ.Dill@asu.edu> July 2001
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7 | *
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8 | * Licensed under the GPL v2 or later, see the file LICENSE in this tarball.
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9 | */
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10 |
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11 | #include <getopt.h>
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12 | #include <syslog.h>
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13 |
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14 | /* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */
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15 | #define WANT_PIDFILE 1
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16 | #include "common.h"
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17 | #include "dhcpd.h"
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18 | #include "dhcpc.h"
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19 | #include "options.h"
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20 |
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21 |
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22 | /* Something is definitely wrong here. IPv4 addresses
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23 | * in variables of type long?? BTW, we use inet_ntoa()
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24 | * in the code. Manpage says that struct in_addr has a member of type long (!)
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25 | * which holds IPv4 address, and the struct is passed by value (!!)
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26 | */
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27 | static unsigned timeout;
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28 | static uint32_t requested_ip; /* = 0 */
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29 | static uint32_t server_addr;
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30 | static int packet_num; /* = 0 */
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31 | static int sockfd = -1;
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32 |
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33 | #define LISTEN_NONE 0
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34 | #define LISTEN_KERNEL 1
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35 | #define LISTEN_RAW 2
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36 | static smallint listen_mode;
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37 |
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38 | static smallint state;
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39 |
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40 | struct client_config_t client_config;
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41 |
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42 |
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43 | /* just a little helper */
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44 | static void change_mode(int new_mode)
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45 | {
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46 | DEBUG("entering %s listen mode",
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47 | new_mode ? (new_mode == 1 ? "kernel" : "raw") : "none");
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48 | if (sockfd >= 0) {
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49 | close(sockfd);
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50 | sockfd = -1;
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51 | }
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52 | listen_mode = new_mode;
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53 | }
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54 |
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55 |
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56 | /* perform a renew */
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57 | static void perform_renew(void)
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58 | {
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59 | bb_info_msg("Performing a DHCP renew");
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60 | switch (state) {
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61 | case BOUND:
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62 | change_mode(LISTEN_KERNEL);
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63 | case RENEWING:
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64 | case REBINDING:
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65 | state = RENEW_REQUESTED;
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66 | break;
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67 | case RENEW_REQUESTED: /* impatient are we? fine, square 1 */
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68 | udhcp_run_script(NULL, "deconfig");
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69 | case REQUESTING:
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70 | case RELEASED:
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71 | change_mode(LISTEN_RAW);
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72 | state = INIT_SELECTING;
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73 | break;
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74 | case INIT_SELECTING:
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75 | break;
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76 | }
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77 |
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78 | /* start things over */
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79 | packet_num = 0;
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80 |
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81 | /* Kill any timeouts because the user wants this to hurry along */
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82 | timeout = 0;
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83 | }
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84 |
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85 |
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86 | /* perform a release */
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87 | static void perform_release(void)
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88 | {
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89 | char buffer[sizeof("255.255.255.255")];
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90 | struct in_addr temp_addr;
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91 |
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92 | /* send release packet */
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93 | if (state == BOUND || state == RENEWING || state == REBINDING) {
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94 | temp_addr.s_addr = server_addr;
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95 | strcpy(buffer, inet_ntoa(temp_addr));
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96 | temp_addr.s_addr = requested_ip;
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97 | bb_info_msg("Unicasting a release of %s to %s",
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98 | inet_ntoa(temp_addr), buffer);
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99 | send_release(server_addr, requested_ip); /* unicast */
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100 | udhcp_run_script(NULL, "deconfig");
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101 | }
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102 | bb_info_msg("Entering released state");
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103 |
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104 | change_mode(LISTEN_NONE);
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105 | state = RELEASED;
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106 | timeout = INT_MAX;
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107 | }
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108 |
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109 |
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110 | static void client_background(void)
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111 | {
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112 | #if !BB_MMU
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113 | bb_error_msg("cannot background in uclinux (yet)");
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114 | /* ... mainly because udhcpc calls client_background()
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115 | * in _the _middle _of _udhcpc _run_, not at the start!
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116 | * If that will be properly disabled for NOMMU, client_background()
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117 | * will work on NOMMU too */
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118 | #else
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119 | bb_daemonize(0);
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120 | logmode &= ~LOGMODE_STDIO;
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121 | /* rewrite pidfile, as our pid is different now */
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122 | write_pidfile(client_config.pidfile);
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123 | #endif
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124 | /* Do not fork again. */
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125 | client_config.foreground = 1;
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126 | client_config.background_if_no_lease = 0;
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127 | }
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128 |
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129 |
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130 | static uint8_t* alloc_dhcp_option(int code, const char *str, int extra)
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131 | {
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132 | uint8_t *storage;
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133 | int len = strlen(str);
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134 | if (len > 255) len = 255;
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135 | storage = xzalloc(len + extra + OPT_DATA);
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136 | storage[OPT_CODE] = code;
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137 | storage[OPT_LEN] = len + extra;
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138 | memcpy(storage + extra + OPT_DATA, str, len);
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139 | return storage;
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140 | }
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141 |
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142 |
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143 | int udhcpc_main(int argc, char **argv);
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144 | int udhcpc_main(int argc, char **argv)
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145 | {
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146 | uint8_t *temp, *message;
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147 | char *str_c, *str_V, *str_h, *str_F, *str_r, *str_T, *str_t;
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148 | uint32_t xid = 0;
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149 | uint32_t lease = 0; /* can be given as 32-bit quantity */
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150 | unsigned t1 = 0, t2 = 0; /* what a wonderful names */
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151 | unsigned start = 0;
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152 | unsigned now;
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153 | unsigned opt;
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154 | int max_fd;
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155 | int retval;
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156 | int len;
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157 | struct timeval tv;
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158 | struct in_addr temp_addr;
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159 | struct dhcpMessage packet;
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160 | fd_set rfds;
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161 |
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162 | enum {
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163 | OPT_c = 1 << 0,
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164 | OPT_C = 1 << 1,
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165 | OPT_V = 1 << 2,
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166 | OPT_f = 1 << 3,
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167 | OPT_b = 1 << 4,
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168 | OPT_H = 1 << 5,
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169 | OPT_h = 1 << 6,
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170 | OPT_F = 1 << 7,
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171 | OPT_i = 1 << 8,
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172 | OPT_n = 1 << 9,
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173 | OPT_p = 1 << 10,
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174 | OPT_q = 1 << 11,
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175 | OPT_R = 1 << 12,
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176 | OPT_r = 1 << 13,
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177 | OPT_s = 1 << 14,
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178 | OPT_T = 1 << 15,
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179 | OPT_t = 1 << 16,
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180 | OPT_v = 1 << 17,
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181 | OPT_S = 1 << 18,
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182 | };
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183 | #if ENABLE_GETOPT_LONG
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184 | static const char udhcpc_longopts[] ALIGN1 =
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185 | "clientid\0" Required_argument "c"
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186 | "clientid-none\0" No_argument "C"
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187 | "vendorclass\0" Required_argument "V"
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188 | "foreground\0" No_argument "f"
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189 | "background\0" No_argument "b"
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190 | "hostname\0" Required_argument "H"
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191 | "hostname\0" Required_argument "h"
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192 | "fqdn\0" Required_argument "F"
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193 | "interface\0" Required_argument "i"
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194 | "now\0" No_argument "n"
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195 | "pidfile\0" Required_argument "p"
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196 | "quit\0" No_argument "q"
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197 | "release\0" No_argument "R"
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198 | "request\0" Required_argument "r"
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199 | "script\0" Required_argument "s"
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200 | "timeout\0" Required_argument "T"
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201 | "version\0" No_argument "v"
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202 | "retries\0" Required_argument "t"
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203 | "syslog\0" No_argument "S"
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204 | ;
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205 | #endif
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206 | /* Default options. */
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207 | client_config.interface = "eth0";
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208 | client_config.script = DEFAULT_SCRIPT;
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209 | client_config.retries = 3;
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210 | client_config.timeout = 3;
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211 |
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212 | /* Parse command line */
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213 | opt_complementary = "c--C:C--c" // mutually exclusive
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214 | ":hH:Hh"; // -h and -H are the same
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215 | #if ENABLE_GETOPT_LONG
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216 | applet_long_options = udhcpc_longopts;
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217 | #endif
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218 | opt = getopt32(argv, "c:CV:fbH:h:F:i:np:qRr:s:T:t:vS",
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219 | &str_c, &str_V, &str_h, &str_h, &str_F,
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220 | &client_config.interface, &client_config.pidfile, &str_r,
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221 | &client_config.script, &str_T, &str_t
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222 | );
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223 |
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224 | if (opt & OPT_c)
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225 | client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, str_c, 0);
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226 | //if (opt & OPT_C)
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227 | if (opt & OPT_V)
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228 | client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0);
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229 | if (opt & OPT_f)
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230 | client_config.foreground = 1;
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231 | if (opt & OPT_b)
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232 | client_config.background_if_no_lease = 1;
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233 | if (opt & OPT_h)
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234 | client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0);
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235 | if (opt & OPT_F) {
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236 | client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3);
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237 | /* Flags: 0000NEOS
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238 | S: 1 => Client requests Server to update A RR in DNS as well as PTR
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239 | O: 1 => Server indicates to client that DNS has been updated regardless
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240 | E: 1 => Name data is DNS format, i.e. <4>host<6>domain<4>com<0> not "host.domain.com"
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241 | N: 1 => Client requests Server to not update DNS
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242 | */
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243 | client_config.fqdn[OPT_DATA + 0] = 0x1;
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244 | /* client_config.fqdn[OPT_DATA + 1] = 0; - redundant */
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245 | /* client_config.fqdn[OPT_DATA + 2] = 0; - redundant */
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246 | }
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247 | // if (opt & OPT_i) client_config.interface = ...
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248 | if (opt & OPT_n)
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249 | client_config.abort_if_no_lease = 1;
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250 | // if (opt & OPT_p) client_config.pidfile = ...
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251 | if (opt & OPT_q)
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252 | client_config.quit_after_lease = 1;
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253 | if (opt & OPT_R)
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254 | client_config.release_on_quit = 1;
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255 | if (opt & OPT_r)
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256 | requested_ip = inet_addr(str_r);
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257 | // if (opt & OPT_s) client_config.script = ...
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258 | if (opt & OPT_T)
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259 | client_config.timeout = xatoi_u(str_T);
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260 | if (opt & OPT_t)
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261 | client_config.retries = xatoi_u(str_t);
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262 | if (opt & OPT_v) {
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263 | printf("version %s\n", BB_VER);
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264 | return 0;
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265 | }
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266 |
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267 | if (opt & OPT_S) {
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268 | openlog(applet_name, LOG_PID, LOG_LOCAL0);
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269 | logmode |= LOGMODE_SYSLOG;
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270 | }
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271 |
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272 | if (read_interface(client_config.interface, &client_config.ifindex,
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273 | NULL, client_config.arp))
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274 | return 1;
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275 |
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276 | /* Make sure fd 0,1,2 are open */
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277 | bb_sanitize_stdio();
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278 | /* Equivalent of doing a fflush after every \n */
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279 | setlinebuf(stdout);
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280 |
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281 | /* Create pidfile */
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282 | write_pidfile(client_config.pidfile);
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283 | /* if (!..) bb_perror_msg("cannot create pidfile %s", pidfile); */
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284 |
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285 | /* Goes to stdout and possibly syslog */
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286 | bb_info_msg("%s (v%s) started", applet_name, BB_VER);
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287 |
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288 | /* if not set, and not suppressed, setup the default client ID */
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289 | if (!client_config.clientid && !(opt & OPT_C)) {
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290 | client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7);
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291 | client_config.clientid[OPT_DATA] = 1;
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292 | memcpy(client_config.clientid + OPT_DATA+1, client_config.arp, 6);
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293 | }
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294 |
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295 | if (!client_config.vendorclass)
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296 | client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, "udhcp "BB_VER, 0);
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297 |
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298 | /* setup the signal pipe */
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299 | udhcp_sp_setup();
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300 |
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301 | state = INIT_SELECTING;
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302 | udhcp_run_script(NULL, "deconfig");
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303 | change_mode(LISTEN_RAW);
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304 | tv.tv_sec = 0;
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305 | goto jump_in;
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306 |
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307 | for (;;) {
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308 | tv.tv_sec = timeout - monotonic_sec();
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309 | jump_in:
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310 | tv.tv_usec = 0;
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311 |
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312 | if (listen_mode != LISTEN_NONE && sockfd < 0) {
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313 | if (listen_mode == LISTEN_KERNEL)
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314 | sockfd = listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface);
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315 | else
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316 | sockfd = raw_socket(client_config.ifindex);
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317 | }
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318 | max_fd = udhcp_sp_fd_set(&rfds, sockfd);
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319 |
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320 | retval = 0; /* If we already timed out, fall through, else... */
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321 | if (tv.tv_sec > 0) {
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322 | DEBUG("Waiting on select...");
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323 | retval = select(max_fd + 1, &rfds, NULL, NULL, &tv);
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324 | }
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325 |
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326 | now = monotonic_sec();
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327 | if (retval < 0) {
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328 | /* EINTR? signal was caught, don't panic */
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329 | if (errno != EINTR) {
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330 | /* Else: an error occured, panic! */
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331 | bb_perror_msg_and_die("select");
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332 | }
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333 | } else if (retval == 0) {
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334 | /* timeout dropped to zero */
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335 | switch (state) {
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336 | case INIT_SELECTING:
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337 | if (packet_num < client_config.retries) {
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338 | if (packet_num == 0)
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339 | xid = random_xid();
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340 |
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341 | /* send discover packet */
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342 | send_discover(xid, requested_ip); /* broadcast */
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343 |
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344 | timeout = now + client_config.timeout;
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345 | packet_num++;
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346 | } else {
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347 | udhcp_run_script(NULL, "leasefail");
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348 | if (client_config.background_if_no_lease) {
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349 | bb_info_msg("No lease, forking to background");
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350 | client_background();
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351 | } else if (client_config.abort_if_no_lease) {
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352 | bb_info_msg("No lease, failing");
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353 | retval = 1;
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354 | goto ret;
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355 | }
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356 | /* wait to try again */
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357 | packet_num = 0;
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358 | timeout = now + 60;
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359 | }
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360 | break;
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361 | case RENEW_REQUESTED:
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362 | case REQUESTING:
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363 | if (packet_num < client_config.retries) {
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364 | /* send request packet */
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365 | if (state == RENEW_REQUESTED)
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366 | send_renew(xid, server_addr, requested_ip); /* unicast */
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367 | else send_selecting(xid, server_addr, requested_ip); /* broadcast */
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368 |
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369 | timeout = now + ((packet_num == 2) ? 10 : 2);
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370 | packet_num++;
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371 | } else {
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372 | /* timed out, go back to init state */
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373 | if (state == RENEW_REQUESTED)
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374 | udhcp_run_script(NULL, "deconfig");
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375 | state = INIT_SELECTING;
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376 | timeout = now;
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377 | packet_num = 0;
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378 | change_mode(LISTEN_RAW);
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379 | }
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380 | break;
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381 | case BOUND:
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382 | /* Lease is starting to run out, time to enter renewing state */
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383 | state = RENEWING;
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384 | change_mode(LISTEN_KERNEL);
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385 | DEBUG("Entering renew state");
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386 | /* fall right through */
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387 | case RENEWING:
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388 | /* Either set a new T1, or enter REBINDING state */
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389 | if ((t2 - t1) <= (lease / 14400 + 1)) {
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390 | /* timed out, enter rebinding state */
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391 | state = REBINDING;
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392 | timeout = now + (t2 - t1);
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393 | DEBUG("Entering rebinding state");
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394 | } else {
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395 | /* send a request packet */
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396 | send_renew(xid, server_addr, requested_ip); /* unicast */
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397 | t1 = (t2 - t1) / 2 + t1;
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398 | timeout = start + t1;
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399 | }
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400 | break;
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401 | case REBINDING:
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402 | /* Either set a new T2, or enter INIT state */
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403 | if ((lease - t2) <= (lease / 14400 + 1)) {
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404 | /* timed out, enter init state */
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405 | state = INIT_SELECTING;
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406 | bb_info_msg("Lease lost, entering init state");
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407 | udhcp_run_script(NULL, "deconfig");
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408 | timeout = now;
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409 | packet_num = 0;
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410 | change_mode(LISTEN_RAW);
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411 | } else {
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412 | /* send a request packet */
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413 | send_renew(xid, 0, requested_ip); /* broadcast */
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414 | t2 = (lease - t2) / 2 + t2;
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415 | timeout = start + t2;
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416 | }
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417 | break;
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418 | case RELEASED:
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419 | /* yah, I know, *you* say it would never happen */
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420 | timeout = INT_MAX;
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421 | break;
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422 | }
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423 | } else if (listen_mode != LISTEN_NONE && FD_ISSET(sockfd, &rfds)) {
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424 | /* a packet is ready, read it */
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425 |
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426 | if (listen_mode == LISTEN_KERNEL)
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427 | len = udhcp_get_packet(&packet, sockfd);
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428 | else len = get_raw_packet(&packet, sockfd);
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429 |
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430 | if (len == -1 && errno != EINTR) {
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431 | DEBUG("error on read, %s, reopening socket", strerror(errno));
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432 | change_mode(listen_mode); /* just close and reopen */
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433 | }
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434 | if (len < 0) continue;
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435 |
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436 | if (packet.xid != xid) {
|
---|
437 | DEBUG("Ignoring XID %x (our xid is %x)",
|
---|
438 | (unsigned)packet.xid, (unsigned)xid);
|
---|
439 | continue;
|
---|
440 | }
|
---|
441 |
|
---|
442 | /* Ignore packets that aren't for us */
|
---|
443 | if (memcmp(packet.chaddr, client_config.arp, 6)) {
|
---|
444 | DEBUG("Packet does not have our chaddr - ignoring");
|
---|
445 | continue;
|
---|
446 | }
|
---|
447 |
|
---|
448 | message = get_option(&packet, DHCP_MESSAGE_TYPE);
|
---|
449 | if (message == NULL) {
|
---|
450 | bb_error_msg("cannot get option from packet - ignoring");
|
---|
451 | continue;
|
---|
452 | }
|
---|
453 |
|
---|
454 | switch (state) {
|
---|
455 | case INIT_SELECTING:
|
---|
456 | /* Must be a DHCPOFFER to one of our xid's */
|
---|
457 | if (*message == DHCPOFFER) {
|
---|
458 | temp = get_option(&packet, DHCP_SERVER_ID);
|
---|
459 | if (temp) {
|
---|
460 | /* can be misaligned, thus memcpy */
|
---|
461 | memcpy(&server_addr, temp, 4);
|
---|
462 | xid = packet.xid;
|
---|
463 | requested_ip = packet.yiaddr;
|
---|
464 |
|
---|
465 | /* enter requesting state */
|
---|
466 | state = REQUESTING;
|
---|
467 | timeout = now;
|
---|
468 | packet_num = 0;
|
---|
469 | } else {
|
---|
470 | bb_error_msg("no server ID in message");
|
---|
471 | }
|
---|
472 | }
|
---|
473 | break;
|
---|
474 | case RENEW_REQUESTED:
|
---|
475 | case REQUESTING:
|
---|
476 | case RENEWING:
|
---|
477 | case REBINDING:
|
---|
478 | if (*message == DHCPACK) {
|
---|
479 | temp = get_option(&packet, DHCP_LEASE_TIME);
|
---|
480 | if (!temp) {
|
---|
481 | bb_error_msg("no lease time with ACK, using 1 hour lease");
|
---|
482 | lease = 60 * 60;
|
---|
483 | } else {
|
---|
484 | /* can be misaligned, thus memcpy */
|
---|
485 | memcpy(&lease, temp, 4);
|
---|
486 | lease = ntohl(lease);
|
---|
487 | }
|
---|
488 |
|
---|
489 | /* enter bound state */
|
---|
490 | t1 = lease / 2;
|
---|
491 |
|
---|
492 | /* little fixed point for n * .875 */
|
---|
493 | t2 = (lease * 7) >> 3;
|
---|
494 | temp_addr.s_addr = packet.yiaddr;
|
---|
495 | bb_info_msg("Lease of %s obtained, lease time %u",
|
---|
496 | inet_ntoa(temp_addr), (unsigned)lease);
|
---|
497 | start = now;
|
---|
498 | timeout = start + t1;
|
---|
499 | requested_ip = packet.yiaddr;
|
---|
500 | udhcp_run_script(&packet,
|
---|
501 | ((state == RENEWING || state == REBINDING) ? "renew" : "bound"));
|
---|
502 |
|
---|
503 | state = BOUND;
|
---|
504 | change_mode(LISTEN_NONE);
|
---|
505 | if (client_config.quit_after_lease) {
|
---|
506 | if (client_config.release_on_quit)
|
---|
507 | perform_release();
|
---|
508 | goto ret0;
|
---|
509 | }
|
---|
510 | if (!client_config.foreground)
|
---|
511 | client_background();
|
---|
512 |
|
---|
513 | } else if (*message == DHCPNAK) {
|
---|
514 | /* return to init state */
|
---|
515 | bb_info_msg("Received DHCP NAK");
|
---|
516 | udhcp_run_script(&packet, "nak");
|
---|
517 | if (state != REQUESTING)
|
---|
518 | udhcp_run_script(NULL, "deconfig");
|
---|
519 | state = INIT_SELECTING;
|
---|
520 | timeout = now;
|
---|
521 | requested_ip = 0;
|
---|
522 | packet_num = 0;
|
---|
523 | change_mode(LISTEN_RAW);
|
---|
524 | sleep(3); /* avoid excessive network traffic */
|
---|
525 | }
|
---|
526 | break;
|
---|
527 | /* case BOUND, RELEASED: - ignore all packets */
|
---|
528 | }
|
---|
529 | } else {
|
---|
530 | int signo = udhcp_sp_read(&rfds);
|
---|
531 | switch (signo) {
|
---|
532 | case SIGUSR1:
|
---|
533 | perform_renew();
|
---|
534 | break;
|
---|
535 | case SIGUSR2:
|
---|
536 | perform_release();
|
---|
537 | break;
|
---|
538 | case SIGTERM:
|
---|
539 | bb_info_msg("Received SIGTERM");
|
---|
540 | if (client_config.release_on_quit)
|
---|
541 | perform_release();
|
---|
542 | goto ret0;
|
---|
543 | }
|
---|
544 | }
|
---|
545 | } /* for (;;) */
|
---|
546 | ret0:
|
---|
547 | retval = 0;
|
---|
548 | ret:
|
---|
549 | /*if (client_config.pidfile) - remove_pidfile has it's own check */
|
---|
550 | remove_pidfile(client_config.pidfile);
|
---|
551 | return retval;
|
---|
552 | }
|
---|