"Robert P. J. Day" | 63fc1a9 | 2006-07-02 19:47:05 +0000 | [diff] [blame] | 1 | /* vi: set sw=4 ts=4: */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 2 | /* |
Denys Vlasenko | 385b456 | 2010-03-26 10:09:34 +0100 | [diff] [blame] | 3 | * udhcp client |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 4 | * |
| 5 | * Russ Dill <Russ.Dill@asu.edu> July 2001 |
| 6 | * |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 7 | * This program is free software; you can redistribute it and/or modify |
| 8 | * it under the terms of the GNU General Public License as published by |
| 9 | * the Free Software Foundation; either version 2 of the License, or |
| 10 | * (at your option) any later version. |
| 11 | * |
| 12 | * This program is distributed in the hope that it will be useful, |
| 13 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 14 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 15 | * GNU General Public License for more details. |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License |
| 18 | * along with this program; if not, write to the Free Software |
| 19 | * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 20 | */ |
Denis Vlasenko | af1c843 | 2007-03-26 13:22:35 +0000 | [diff] [blame] | 21 | #include <syslog.h> |
Denis Vlasenko | 1caca34 | 2007-08-02 10:14:29 +0000 | [diff] [blame] | 22 | /* Override ENABLE_FEATURE_PIDFILE - ifupdown needs our pidfile to always exist */ |
| 23 | #define WANT_PIDFILE 1 |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 24 | #include "common.h" |
| 25 | #include "dhcpd.h" |
| 26 | #include "dhcpc.h" |
Denis Vlasenko | 5a3395b | 2006-11-18 19:51:32 +0000 | [diff] [blame] | 27 | |
Dan Fandrich | f533ec8 | 2011-06-10 05:17:59 +0200 | [diff] [blame] | 28 | #include <netinet/if_ether.h> |
| 29 | #include <netpacket/packet.h> |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 30 | #include <linux/filter.h> |
| 31 | |
Denis Vlasenko | deabacd | 2007-09-30 17:55:43 +0000 | [diff] [blame] | 32 | /* struct client_config_t client_config is in bb_common_bufsiz1 */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 33 | |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 34 | |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 35 | #if ENABLE_LONG_OPTS |
| 36 | static const char udhcpc_longopts[] ALIGN1 = |
| 37 | "clientid-none\0" No_argument "C" |
| 38 | "vendorclass\0" Required_argument "V" |
| 39 | "hostname\0" Required_argument "H" |
| 40 | "fqdn\0" Required_argument "F" |
| 41 | "interface\0" Required_argument "i" |
| 42 | "now\0" No_argument "n" |
| 43 | "pidfile\0" Required_argument "p" |
| 44 | "quit\0" No_argument "q" |
| 45 | "release\0" No_argument "R" |
| 46 | "request\0" Required_argument "r" |
| 47 | "script\0" Required_argument "s" |
| 48 | "timeout\0" Required_argument "T" |
| 49 | "version\0" No_argument "v" |
| 50 | "retries\0" Required_argument "t" |
| 51 | "tryagain\0" Required_argument "A" |
| 52 | "syslog\0" No_argument "S" |
| 53 | "request-option\0" Required_argument "O" |
| 54 | "no-default-options\0" No_argument "o" |
| 55 | "foreground\0" No_argument "f" |
| 56 | "background\0" No_argument "b" |
| 57 | "broadcast\0" No_argument "B" |
| 58 | IF_FEATURE_UDHCPC_ARPING("arping\0" No_argument "a") |
| 59 | IF_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P") |
| 60 | ; |
| 61 | #endif |
| 62 | /* Must match getopt32 option string order */ |
| 63 | enum { |
| 64 | OPT_C = 1 << 0, |
| 65 | OPT_V = 1 << 1, |
| 66 | OPT_H = 1 << 2, |
| 67 | OPT_h = 1 << 3, |
| 68 | OPT_F = 1 << 4, |
| 69 | OPT_i = 1 << 5, |
| 70 | OPT_n = 1 << 6, |
| 71 | OPT_p = 1 << 7, |
| 72 | OPT_q = 1 << 8, |
| 73 | OPT_R = 1 << 9, |
| 74 | OPT_r = 1 << 10, |
| 75 | OPT_s = 1 << 11, |
| 76 | OPT_T = 1 << 12, |
| 77 | OPT_t = 1 << 13, |
| 78 | OPT_S = 1 << 14, |
| 79 | OPT_A = 1 << 15, |
| 80 | OPT_O = 1 << 16, |
| 81 | OPT_o = 1 << 17, |
| 82 | OPT_x = 1 << 18, |
| 83 | OPT_f = 1 << 19, |
| 84 | OPT_B = 1 << 20, |
| 85 | /* The rest has variable bit positions, need to be clever */ |
| 86 | OPTBIT_B = 20, |
| 87 | USE_FOR_MMU( OPTBIT_b,) |
| 88 | IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,) |
| 89 | IF_FEATURE_UDHCP_PORT( OPTBIT_P,) |
| 90 | USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,) |
| 91 | IF_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,) |
| 92 | IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,) |
| 93 | }; |
| 94 | |
| 95 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 96 | /*** Script execution code ***/ |
| 97 | |
| 98 | /* get a rough idea of how long an option will be (rounding up...) */ |
| 99 | static const uint8_t len_of_option_as_string[] = { |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 100 | [OPTION_IP ] = sizeof("255.255.255.255 "), |
| 101 | [OPTION_IP_PAIR ] = sizeof("255.255.255.255 ") * 2, |
| 102 | [OPTION_STATIC_ROUTES ] = sizeof("255.255.255.255/32 255.255.255.255 "), |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 103 | [OPTION_6RD ] = sizeof("32 128 ffff:ffff:ffff:ffff:ffff:ffff:ffff:ffff 255.255.255.255 "), |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 104 | [OPTION_STRING ] = 1, |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 105 | #if ENABLE_FEATURE_UDHCP_RFC3397 |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 106 | [OPTION_DNS_STRING ] = 1, /* unused */ |
| 107 | /* Hmmm, this severely overestimates size if SIP_SERVERS option |
| 108 | * is in domain name form: N-byte option in binary form |
| 109 | * mallocs ~16*N bytes. But it is freed almost at once. |
| 110 | */ |
| 111 | [OPTION_SIP_SERVERS ] = sizeof("255.255.255.255 "), |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 112 | #endif |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 113 | // [OPTION_BOOLEAN ] = sizeof("yes "), |
| 114 | [OPTION_U8 ] = sizeof("255 "), |
| 115 | [OPTION_U16 ] = sizeof("65535 "), |
| 116 | // [OPTION_S16 ] = sizeof("-32768 "), |
| 117 | [OPTION_U32 ] = sizeof("4294967295 "), |
| 118 | [OPTION_S32 ] = sizeof("-2147483684 "), |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 119 | }; |
| 120 | |
| 121 | /* note: ip is a pointer to an IP in network order, possibly misaliged */ |
| 122 | static int sprint_nip(char *dest, const char *pre, const uint8_t *ip) |
| 123 | { |
| 124 | return sprintf(dest, "%s%u.%u.%u.%u", pre, ip[0], ip[1], ip[2], ip[3]); |
| 125 | } |
| 126 | |
Denys Vlasenko | 42816c2 | 2011-10-20 10:52:07 +0200 | [diff] [blame] | 127 | static int sprint_nip6(char *dest, /*const char *pre,*/ const uint8_t *ip) |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 128 | { |
| 129 | char hexstrbuf[16 * 2]; |
| 130 | bin2hex(hexstrbuf, (void*)ip, 16); |
Denys Vlasenko | 42816c2 | 2011-10-20 10:52:07 +0200 | [diff] [blame] | 131 | return sprintf(dest, /* "%s" */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 132 | "%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s:%.4s", |
Denys Vlasenko | 42816c2 | 2011-10-20 10:52:07 +0200 | [diff] [blame] | 133 | /* pre, */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 134 | hexstrbuf + 0 * 4, |
| 135 | hexstrbuf + 1 * 4, |
| 136 | hexstrbuf + 2 * 4, |
| 137 | hexstrbuf + 3 * 4, |
| 138 | hexstrbuf + 4 * 4, |
| 139 | hexstrbuf + 5 * 4, |
| 140 | hexstrbuf + 6 * 4, |
| 141 | hexstrbuf + 7 * 4 |
| 142 | ); |
| 143 | } |
| 144 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 145 | /* really simple implementation, just count the bits */ |
| 146 | static int mton(uint32_t mask) |
| 147 | { |
| 148 | int i = 0; |
| 149 | mask = ntohl(mask); /* 111110000-like bit pattern */ |
| 150 | while (mask) { |
| 151 | i++; |
| 152 | mask <<= 1; |
| 153 | } |
| 154 | return i; |
| 155 | } |
| 156 | |
| 157 | /* Create "opt_name=opt_value" string */ |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 158 | static NOINLINE char *xmalloc_optname_optval(uint8_t *option, const struct dhcp_optflag *optflag, const char *opt_name) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 159 | { |
| 160 | unsigned upper_length; |
| 161 | int len, type, optlen; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 162 | char *dest, *ret; |
| 163 | |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 164 | /* option points to OPT_DATA, need to go back to get OPT_LEN */ |
| 165 | len = option[-OPT_DATA + OPT_LEN]; |
Vladislav Grishenko | ad8def2 | 2010-10-17 12:27:50 +0200 | [diff] [blame] | 166 | |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 167 | type = optflag->flags & OPTION_TYPE_MASK; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 168 | optlen = dhcp_option_lengths[type]; |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 169 | upper_length = len_of_option_as_string[type] |
| 170 | * ((unsigned)(len + optlen - 1) / (unsigned)optlen); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 171 | |
| 172 | dest = ret = xmalloc(upper_length + strlen(opt_name) + 2); |
| 173 | dest += sprintf(ret, "%s=", opt_name); |
| 174 | |
| 175 | while (len >= optlen) { |
| 176 | switch (type) { |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 177 | case OPTION_IP: |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 178 | case OPTION_IP_PAIR: |
| 179 | dest += sprint_nip(dest, "", option); |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 180 | if (type == OPTION_IP) |
| 181 | break; |
| 182 | dest += sprint_nip(dest, "/", option + 4); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 183 | break; |
Denys Vlasenko | a8f6b99 | 2010-03-26 08:35:24 +0100 | [diff] [blame] | 184 | // case OPTION_BOOLEAN: |
| 185 | // dest += sprintf(dest, *option ? "yes" : "no"); |
| 186 | // break; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 187 | case OPTION_U8: |
| 188 | dest += sprintf(dest, "%u", *option); |
| 189 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 190 | // case OPTION_S16: |
| 191 | case OPTION_U16: { |
| 192 | uint16_t val_u16; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 193 | move_from_unaligned16(val_u16, option); |
| 194 | dest += sprintf(dest, "%u", ntohs(val_u16)); |
| 195 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 196 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 197 | case OPTION_S32: |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 198 | case OPTION_U32: { |
| 199 | uint32_t val_u32; |
| 200 | move_from_unaligned32(val_u32, option); |
| 201 | dest += sprintf(dest, type == OPTION_U32 ? "%lu" : "%ld", (unsigned long) ntohl(val_u32)); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 202 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 203 | } |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 204 | /* Note: options which use 'return' instead of 'break' |
| 205 | * (for example, OPTION_STRING) skip the code which handles |
| 206 | * the case of list of options. |
| 207 | */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 208 | case OPTION_STRING: |
| 209 | memcpy(dest, option, len); |
| 210 | dest[len] = '\0'; |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 211 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 212 | case OPTION_STATIC_ROUTES: { |
| 213 | /* Option binary format: |
| 214 | * mask [one byte, 0..32] |
| 215 | * ip [big endian, 0..4 bytes depending on mask] |
| 216 | * router [big endian, 4 bytes] |
| 217 | * may be repeated |
| 218 | * |
| 219 | * We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2" |
| 220 | */ |
| 221 | const char *pfx = ""; |
| 222 | |
| 223 | while (len >= 1 + 4) { /* mask + 0-byte ip + router */ |
| 224 | uint32_t nip; |
| 225 | uint8_t *p; |
| 226 | unsigned mask; |
| 227 | int bytes; |
| 228 | |
| 229 | mask = *option++; |
| 230 | if (mask > 32) |
| 231 | break; |
| 232 | len--; |
| 233 | |
| 234 | nip = 0; |
| 235 | p = (void*) &nip; |
| 236 | bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */ |
| 237 | while (--bytes >= 0) { |
| 238 | *p++ = *option++; |
| 239 | len--; |
| 240 | } |
| 241 | if (len < 4) |
| 242 | break; |
| 243 | |
| 244 | /* print ip/mask */ |
| 245 | dest += sprint_nip(dest, pfx, (void*) &nip); |
| 246 | pfx = " "; |
| 247 | dest += sprintf(dest, "/%u ", mask); |
| 248 | /* print router */ |
| 249 | dest += sprint_nip(dest, "", option); |
| 250 | option += 4; |
| 251 | len -= 4; |
| 252 | } |
| 253 | |
| 254 | return ret; |
| 255 | } |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 256 | case OPTION_6RD: |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 257 | /* Option binary format (see RFC 5969): |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 258 | * 0 1 2 3 |
| 259 | * 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 260 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 261 | * | OPTION_6RD | option-length | IPv4MaskLen | 6rdPrefixLen | |
| 262 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 263 | * | 6rdPrefix | |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 264 | * ... (16 octets) ... |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 265 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 266 | * ... 6rdBRIPv4Address(es) ... |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 267 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 268 | * We convert it to a string |
| 269 | * "IPv4MaskLen 6rdPrefixLen 6rdPrefix 6rdBRIPv4Address..." |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 270 | * |
| 271 | * Sanity check: ensure that our length is at least 22 bytes, that |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 272 | * IPv4MaskLen <= 32, |
| 273 | * 6rdPrefixLen <= 128, |
| 274 | * 6rdPrefixLen + (32 - IPv4MaskLen) <= 128 |
| 275 | * (2nd condition need no check - it follows from 1st and 3rd). |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 276 | * Else, return envvar with empty value ("optname=") |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 277 | */ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 278 | if (len >= (1 + 1 + 16 + 4) |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 279 | && option[0] <= 32 |
| 280 | && (option[1] + 32 - option[0]) <= 128 |
| 281 | ) { |
| 282 | /* IPv4MaskLen */ |
| 283 | dest += sprintf(dest, "%u ", *option++); |
| 284 | /* 6rdPrefixLen */ |
| 285 | dest += sprintf(dest, "%u ", *option++); |
| 286 | /* 6rdPrefix */ |
Denys Vlasenko | 42816c2 | 2011-10-20 10:52:07 +0200 | [diff] [blame] | 287 | dest += sprint_nip6(dest, /* "", */ option); |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 288 | option += 16; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 289 | len -= 1 + 1 + 16 + 4; |
| 290 | /* "+ 4" above corresponds to the length of IPv4 addr |
| 291 | * we consume in the loop below */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 292 | while (1) { |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 293 | /* 6rdBRIPv4Address(es) */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 294 | dest += sprint_nip(dest, " ", option); |
| 295 | option += 4; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 296 | len -= 4; /* do we have yet another 4+ bytes? */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 297 | if (len < 0) |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 298 | break; /* no */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 299 | } |
| 300 | } |
| 301 | |
| 302 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 303 | #if ENABLE_FEATURE_UDHCP_RFC3397 |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 304 | case OPTION_DNS_STRING: |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 305 | /* unpack option into dest; use ret for prefix (i.e., "optname=") */ |
| 306 | dest = dname_dec(option, len, ret); |
| 307 | if (dest) { |
| 308 | free(ret); |
| 309 | return dest; |
| 310 | } |
| 311 | /* error. return "optname=" string */ |
| 312 | return ret; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 313 | case OPTION_SIP_SERVERS: |
| 314 | /* Option binary format: |
| 315 | * type: byte |
| 316 | * type=0: domain names, dns-compressed |
| 317 | * type=1: IP addrs |
| 318 | */ |
| 319 | option++; |
| 320 | len--; |
| 321 | if (option[-1] == 0) { |
| 322 | dest = dname_dec(option, len, ret); |
| 323 | if (dest) { |
| 324 | free(ret); |
| 325 | return dest; |
| 326 | } |
| 327 | } else |
| 328 | if (option[-1] == 1) { |
| 329 | const char *pfx = ""; |
| 330 | while (1) { |
| 331 | len -= 4; |
| 332 | if (len < 0) |
| 333 | break; |
| 334 | dest += sprint_nip(dest, pfx, option); |
| 335 | pfx = " "; |
| 336 | option += 4; |
| 337 | } |
| 338 | } |
| 339 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 340 | #endif |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 341 | } /* switch */ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 342 | |
| 343 | /* If we are here, try to format any remaining data |
| 344 | * in the option as another, similarly-formatted option |
| 345 | */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 346 | option += optlen; |
| 347 | len -= optlen; |
Vladislav Grishenko | ad8def2 | 2010-10-17 12:27:50 +0200 | [diff] [blame] | 348 | // TODO: it can be a list only if (optflag->flags & OPTION_LIST). |
| 349 | // Should we bail out/warn if we see multi-ip option which is |
| 350 | // not allowed to be such (for example, DHCP_BROADCAST)? - |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 351 | if (len < optlen /* || !(optflag->flags & OPTION_LIST) */) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 352 | break; |
| 353 | *dest++ = ' '; |
| 354 | *dest = '\0'; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 355 | } /* while */ |
| 356 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 357 | return ret; |
| 358 | } |
| 359 | |
| 360 | /* put all the parameters into the environment */ |
| 361 | static char **fill_envp(struct dhcp_packet *packet) |
| 362 | { |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 363 | int envc; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 364 | int i; |
| 365 | char **envp, **curr; |
| 366 | const char *opt_name; |
| 367 | uint8_t *temp; |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 368 | uint8_t overload = 0; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 369 | |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 370 | #define BITMAP unsigned |
| 371 | #define BBITS (sizeof(BITMAP) * 8) |
| 372 | #define BMASK(i) (1 << (i & (sizeof(BITMAP) * 8 - 1))) |
| 373 | #define FOUND_OPTS(i) (found_opts[(unsigned)i / BBITS]) |
| 374 | BITMAP found_opts[256 / BBITS]; |
| 375 | |
| 376 | memset(found_opts, 0, sizeof(found_opts)); |
| 377 | |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 378 | /* We need 6 elements for: |
| 379 | * "interface=IFACE" |
| 380 | * "ip=N.N.N.N" from packet->yiaddr |
| 381 | * "siaddr=IP" from packet->siaddr_nip (unless 0) |
| 382 | * "boot_file=FILE" from packet->file (unless overloaded) |
| 383 | * "sname=SERVER_HOSTNAME" from packet->sname (unless overloaded) |
| 384 | * terminating NULL |
| 385 | */ |
| 386 | envc = 6; |
| 387 | /* +1 element for each option, +2 for subnet option: */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 388 | if (packet) { |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 389 | /* note: do not search for "pad" (0) and "end" (255) options */ |
| 390 | for (i = 1; i < 255; i++) { |
| 391 | temp = udhcp_get_option(packet, i); |
| 392 | if (temp) { |
| 393 | if (i == DHCP_OPTION_OVERLOAD) |
| 394 | overload = *temp; |
| 395 | else if (i == DHCP_SUBNET) |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 396 | envc++; /* for $mask */ |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 397 | envc++; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 398 | /*if (i != DHCP_MESSAGE_TYPE)*/ |
| 399 | FOUND_OPTS(i) |= BMASK(i); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 400 | } |
| 401 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 402 | } |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 403 | curr = envp = xzalloc(sizeof(envp[0]) * envc); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 404 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 405 | *curr = xasprintf("interface=%s", client_config.interface); |
| 406 | putenv(*curr++); |
| 407 | |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 408 | if (!packet) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 409 | return envp; |
| 410 | |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 411 | /* Export BOOTP fields. Fields we don't (yet?) export: |
| 412 | * uint8_t op; // always BOOTREPLY |
| 413 | * uint8_t htype; // hardware address type. 1 = 10mb ethernet |
| 414 | * uint8_t hlen; // hardware address length |
| 415 | * uint8_t hops; // used by relay agents only |
| 416 | * uint32_t xid; |
| 417 | * uint16_t secs; // elapsed since client began acquisition/renewal |
| 418 | * uint16_t flags; // only one flag so far: bcast. Never set by server |
| 419 | * uint32_t ciaddr; // client IP (usually == yiaddr. can it be different |
| 420 | * // if during renew server wants to give us differn IP?) |
| 421 | * uint32_t gateway_nip; // relay agent IP address |
| 422 | * uint8_t chaddr[16]; // link-layer client hardware address (MAC) |
| 423 | * TODO: export gateway_nip as $giaddr? |
| 424 | */ |
| 425 | /* Most important one: yiaddr as $ip */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 426 | *curr = xmalloc(sizeof("ip=255.255.255.255")); |
| 427 | sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr); |
| 428 | putenv(*curr++); |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 429 | if (packet->siaddr_nip) { |
| 430 | /* IP address of next server to use in bootstrap */ |
| 431 | *curr = xmalloc(sizeof("siaddr=255.255.255.255")); |
| 432 | sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip); |
| 433 | putenv(*curr++); |
| 434 | } |
| 435 | if (!(overload & FILE_FIELD) && packet->file[0]) { |
| 436 | /* watch out for invalid packets */ |
| 437 | *curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file); |
| 438 | putenv(*curr++); |
| 439 | } |
| 440 | if (!(overload & SNAME_FIELD) && packet->sname[0]) { |
| 441 | /* watch out for invalid packets */ |
| 442 | *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname); |
| 443 | putenv(*curr++); |
| 444 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 445 | |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 446 | /* Export known DHCP options */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 447 | opt_name = dhcp_option_strings; |
| 448 | i = 0; |
| 449 | while (*opt_name) { |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 450 | uint8_t code = dhcp_optflags[i].code; |
| 451 | BITMAP *found_ptr = &FOUND_OPTS(code); |
| 452 | BITMAP found_mask = BMASK(code); |
| 453 | if (!(*found_ptr & found_mask)) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 454 | goto next; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 455 | *found_ptr &= ~found_mask; /* leave only unknown options */ |
| 456 | temp = udhcp_get_option(packet, code); |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 457 | *curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 458 | putenv(*curr++); |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 459 | if (code == DHCP_SUBNET) { |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 460 | /* Subnet option: make things like "$ip/$mask" possible */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 461 | uint32_t subnet; |
| 462 | move_from_unaligned32(subnet, temp); |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 463 | *curr = xasprintf("mask=%u", mton(subnet)); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 464 | putenv(*curr++); |
| 465 | } |
| 466 | next: |
| 467 | opt_name += strlen(opt_name) + 1; |
| 468 | i++; |
| 469 | } |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 470 | /* Export unknown options */ |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 471 | for (i = 0; i < 256;) { |
| 472 | BITMAP bitmap = FOUND_OPTS(i); |
| 473 | if (!bitmap) { |
| 474 | i += BBITS; |
| 475 | continue; |
| 476 | } |
| 477 | if (bitmap & BMASK(i)) { |
| 478 | unsigned len, ofs; |
| 479 | |
| 480 | temp = udhcp_get_option(packet, i); |
| 481 | /* udhcp_get_option returns ptr to data portion, |
| 482 | * need to go back to get len |
| 483 | */ |
| 484 | len = temp[-OPT_DATA + OPT_LEN]; |
| 485 | *curr = xmalloc(sizeof("optNNN=") + 1 + len*2); |
| 486 | ofs = sprintf(*curr, "opt%u=", i); |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 487 | *bin2hex(*curr + ofs, (void*) temp, len) = '\0'; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 488 | putenv(*curr++); |
| 489 | } |
| 490 | i++; |
| 491 | } |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame^] | 492 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 493 | return envp; |
| 494 | } |
| 495 | |
| 496 | /* Call a script with a par file and env vars */ |
| 497 | static void udhcp_run_script(struct dhcp_packet *packet, const char *name) |
| 498 | { |
| 499 | char **envp, **curr; |
| 500 | char *argv[3]; |
| 501 | |
| 502 | if (client_config.script == NULL) |
| 503 | return; |
| 504 | |
| 505 | envp = fill_envp(packet); |
| 506 | |
| 507 | /* call script */ |
| 508 | log1("Executing %s %s", client_config.script, name); |
| 509 | argv[0] = (char*) client_config.script; |
| 510 | argv[1] = (char*) name; |
| 511 | argv[2] = NULL; |
| 512 | spawn_and_wait(argv); |
| 513 | |
| 514 | for (curr = envp; *curr; curr++) { |
| 515 | log2(" %s", *curr); |
Denys Vlasenko | dd8adde | 2010-06-24 05:00:50 +0200 | [diff] [blame] | 516 | bb_unsetenv_and_free(*curr); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 517 | } |
| 518 | free(envp); |
| 519 | } |
| 520 | |
| 521 | |
| 522 | /*** Sending/receiving packets ***/ |
| 523 | |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 524 | static ALWAYS_INLINE uint32_t random_xid(void) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 525 | { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 526 | return rand(); |
| 527 | } |
| 528 | |
| 529 | /* Initialize the packet with the proper defaults */ |
| 530 | static void init_packet(struct dhcp_packet *packet, char type) |
| 531 | { |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 532 | uint16_t secs; |
| 533 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 534 | /* Fill in: op, htype, hlen, cookie fields; message type option: */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 535 | udhcp_init_header(packet, type); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 536 | |
| 537 | packet->xid = random_xid(); |
| 538 | |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 539 | client_config.last_secs = monotonic_sec(); |
| 540 | if (client_config.first_secs == 0) |
| 541 | client_config.first_secs = client_config.last_secs; |
| 542 | secs = client_config.last_secs - client_config.first_secs; |
| 543 | packet->secs = htons(secs); |
| 544 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 545 | memcpy(packet->chaddr, client_config.client_mac, 6); |
| 546 | if (client_config.clientid) |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 547 | udhcp_add_binary_option(packet, client_config.clientid); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 548 | } |
| 549 | |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 550 | static void add_client_options(struct dhcp_packet *packet) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 551 | { |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 552 | uint8_t c; |
| 553 | int i, end, len; |
| 554 | |
| 555 | udhcp_add_simple_option(packet, DHCP_MAX_SIZE, htons(IP_UDP_DHCP_SIZE)); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 556 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 557 | /* Add a "param req" option with the list of options we'd like to have |
Denys Vlasenko | a8f6b99 | 2010-03-26 08:35:24 +0100 | [diff] [blame] | 558 | * from stubborn DHCP servers. Pull the data from the struct in common.c. |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 559 | * No bounds checking because it goes towards the head of the packet. */ |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 560 | end = udhcp_end_option(packet->options); |
| 561 | len = 0; |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 562 | for (i = 0; (c = dhcp_optflags[i].code) != 0; i++) { |
| 563 | if (( (dhcp_optflags[i].flags & OPTION_REQ) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 564 | && !client_config.no_default_options |
| 565 | ) |
| 566 | || (client_config.opt_mask[c >> 3] & (1 << (c & 7))) |
| 567 | ) { |
| 568 | packet->options[end + OPT_DATA + len] = c; |
| 569 | len++; |
| 570 | } |
| 571 | } |
| 572 | if (len) { |
| 573 | packet->options[end + OPT_CODE] = DHCP_PARAM_REQ; |
| 574 | packet->options[end + OPT_LEN] = len; |
| 575 | packet->options[end + OPT_DATA + len] = DHCP_END; |
| 576 | } |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 577 | |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 578 | if (client_config.vendorclass) |
| 579 | udhcp_add_binary_option(packet, client_config.vendorclass); |
| 580 | if (client_config.hostname) |
| 581 | udhcp_add_binary_option(packet, client_config.hostname); |
| 582 | if (client_config.fqdn) |
| 583 | udhcp_add_binary_option(packet, client_config.fqdn); |
| 584 | |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 585 | /* Request broadcast replies if we have no IP addr */ |
| 586 | if ((option_mask32 & OPT_B) && packet->ciaddr == 0) |
| 587 | packet->flags |= htons(BROADCAST_FLAG); |
| 588 | |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 589 | /* Add -x options if any */ |
| 590 | { |
| 591 | struct option_set *curr = client_config.options; |
| 592 | while (curr) { |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 593 | udhcp_add_binary_option(packet, curr->data); |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 594 | curr = curr->next; |
| 595 | } |
| 596 | // if (client_config.sname) |
| 597 | // strncpy((char*)packet->sname, client_config.sname, sizeof(packet->sname) - 1); |
| 598 | // if (client_config.boot_file) |
| 599 | // strncpy((char*)packet->file, client_config.boot_file, sizeof(packet->file) - 1); |
| 600 | } |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 601 | } |
| 602 | |
| 603 | /* RFC 2131 |
| 604 | * 4.4.4 Use of broadcast and unicast |
| 605 | * |
| 606 | * The DHCP client broadcasts DHCPDISCOVER, DHCPREQUEST and DHCPINFORM |
| 607 | * messages, unless the client knows the address of a DHCP server. |
| 608 | * The client unicasts DHCPRELEASE messages to the server. Because |
| 609 | * the client is declining the use of the IP address supplied by the server, |
| 610 | * the client broadcasts DHCPDECLINE messages. |
| 611 | * |
| 612 | * When the DHCP client knows the address of a DHCP server, in either |
| 613 | * INIT or REBOOTING state, the client may use that address |
| 614 | * in the DHCPDISCOVER or DHCPREQUEST rather than the IP broadcast address. |
| 615 | * The client may also use unicast to send DHCPINFORM messages |
| 616 | * to a known DHCP server. If the client receives no response to DHCP |
| 617 | * messages sent to the IP address of a known DHCP server, the DHCP |
| 618 | * client reverts to using the IP broadcast address. |
| 619 | */ |
| 620 | |
| 621 | static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet) |
| 622 | { |
| 623 | return udhcp_send_raw_packet(packet, |
| 624 | /*src*/ INADDR_ANY, CLIENT_PORT, |
| 625 | /*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR, |
| 626 | client_config.ifindex); |
| 627 | } |
| 628 | |
| 629 | /* Broadcast a DHCP discover packet to the network, with an optionally requested IP */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 630 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 631 | static NOINLINE int send_discover(uint32_t xid, uint32_t requested) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 632 | { |
| 633 | struct dhcp_packet packet; |
| 634 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 635 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 636 | * random xid field (we override it below), |
| 637 | * client-id option (unless -C), message type option: |
| 638 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 639 | init_packet(&packet, DHCPDISCOVER); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 640 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 641 | packet.xid = xid; |
| 642 | if (requested) |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 643 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 644 | |
| 645 | /* Add options: maxsize, |
| 646 | * optionally: hostname, fqdn, vendorclass, |
| 647 | * "param req" option according to -O, options specified with -x |
| 648 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 649 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 650 | |
| 651 | bb_info_msg("Sending discover..."); |
| 652 | return raw_bcast_from_client_config_ifindex(&packet); |
| 653 | } |
| 654 | |
| 655 | /* Broadcast a DHCP request message */ |
| 656 | /* RFC 2131 3.1 paragraph 3: |
| 657 | * "The client _broadcasts_ a DHCPREQUEST message..." |
| 658 | */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 659 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 660 | static NOINLINE int send_select(uint32_t xid, uint32_t server, uint32_t requested) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 661 | { |
| 662 | struct dhcp_packet packet; |
| 663 | struct in_addr addr; |
| 664 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 665 | /* |
| 666 | * RFC 2131 4.3.2 DHCPREQUEST message |
| 667 | * ... |
| 668 | * If the DHCPREQUEST message contains a 'server identifier' |
| 669 | * option, the message is in response to a DHCPOFFER message. |
| 670 | * Otherwise, the message is a request to verify or extend an |
| 671 | * existing lease. If the client uses a 'client identifier' |
| 672 | * in a DHCPREQUEST message, it MUST use that same 'client identifier' |
| 673 | * in all subsequent messages. If the client included a list |
| 674 | * of requested parameters in a DHCPDISCOVER message, it MUST |
| 675 | * include that list in all subsequent messages. |
| 676 | */ |
| 677 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 678 | * random xid field (we override it below), |
| 679 | * client-id option (unless -C), message type option: |
| 680 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 681 | init_packet(&packet, DHCPREQUEST); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 682 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 683 | packet.xid = xid; |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 684 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 685 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 686 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 687 | |
| 688 | /* Add options: maxsize, |
| 689 | * optionally: hostname, fqdn, vendorclass, |
| 690 | * "param req" option according to -O, and options specified with -x |
| 691 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 692 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 693 | |
| 694 | addr.s_addr = requested; |
| 695 | bb_info_msg("Sending select for %s...", inet_ntoa(addr)); |
| 696 | return raw_bcast_from_client_config_ifindex(&packet); |
| 697 | } |
| 698 | |
| 699 | /* Unicast or broadcast a DHCP renew message */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 700 | /* NOINLINE: limit stack usage in caller */ |
| 701 | static NOINLINE int send_renew(uint32_t xid, uint32_t server, uint32_t ciaddr) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 702 | { |
| 703 | struct dhcp_packet packet; |
| 704 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 705 | /* |
| 706 | * RFC 2131 4.3.2 DHCPREQUEST message |
| 707 | * ... |
| 708 | * DHCPREQUEST generated during RENEWING state: |
| 709 | * |
| 710 | * 'server identifier' MUST NOT be filled in, 'requested IP address' |
| 711 | * option MUST NOT be filled in, 'ciaddr' MUST be filled in with |
| 712 | * client's IP address. In this situation, the client is completely |
| 713 | * configured, and is trying to extend its lease. This message will |
| 714 | * be unicast, so no relay agents will be involved in its |
| 715 | * transmission. Because 'giaddr' is therefore not filled in, the |
| 716 | * DHCP server will trust the value in 'ciaddr', and use it when |
| 717 | * replying to the client. |
| 718 | */ |
| 719 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 720 | * random xid field (we override it below), |
| 721 | * client-id option (unless -C), message type option: |
| 722 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 723 | init_packet(&packet, DHCPREQUEST); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 724 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 725 | packet.xid = xid; |
| 726 | packet.ciaddr = ciaddr; |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 727 | |
| 728 | /* Add options: maxsize, |
| 729 | * optionally: hostname, fqdn, vendorclass, |
| 730 | * "param req" option according to -O, and options specified with -x |
| 731 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 732 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 733 | |
| 734 | bb_info_msg("Sending renew..."); |
| 735 | if (server) |
| 736 | return udhcp_send_kernel_packet(&packet, |
| 737 | ciaddr, CLIENT_PORT, |
| 738 | server, SERVER_PORT); |
| 739 | return raw_bcast_from_client_config_ifindex(&packet); |
| 740 | } |
| 741 | |
| 742 | #if ENABLE_FEATURE_UDHCPC_ARPING |
| 743 | /* Broadcast a DHCP decline message */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 744 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 745 | static NOINLINE int send_decline(uint32_t xid, uint32_t server, uint32_t requested) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 746 | { |
| 747 | struct dhcp_packet packet; |
| 748 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 749 | /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields, |
| 750 | * client-id option (unless -C), message type option: |
| 751 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 752 | init_packet(&packet, DHCPDECLINE); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 753 | |
| 754 | /* RFC 2131 says DHCPDECLINE's xid is randomly selected by client, |
| 755 | * but in case the server is buggy and wants DHCPDECLINE's xid |
| 756 | * to match the xid which started entire handshake, |
| 757 | * we use the same xid we used in initial DHCPDISCOVER: |
| 758 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 759 | packet.xid = xid; |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 760 | /* DHCPDECLINE uses "requested ip", not ciaddr, to store offered IP */ |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 761 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 762 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 763 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 764 | |
| 765 | bb_info_msg("Sending decline..."); |
| 766 | return raw_bcast_from_client_config_ifindex(&packet); |
| 767 | } |
| 768 | #endif |
| 769 | |
| 770 | /* Unicast a DHCP release message */ |
| 771 | static int send_release(uint32_t server, uint32_t ciaddr) |
| 772 | { |
| 773 | struct dhcp_packet packet; |
| 774 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 775 | /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields, |
| 776 | * client-id option (unless -C), message type option: |
| 777 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 778 | init_packet(&packet, DHCPRELEASE); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 779 | |
| 780 | /* DHCPRELEASE uses ciaddr, not "requested ip", to store IP being released */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 781 | packet.ciaddr = ciaddr; |
| 782 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 783 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 784 | |
| 785 | bb_info_msg("Sending release..."); |
| 786 | return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT); |
| 787 | } |
| 788 | |
| 789 | /* Returns -1 on errors that are fatal for the socket, -2 for those that aren't */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 790 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 791 | static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd) |
| 792 | { |
| 793 | int bytes; |
| 794 | struct ip_udp_dhcp_packet packet; |
| 795 | uint16_t check; |
| 796 | |
| 797 | memset(&packet, 0, sizeof(packet)); |
| 798 | bytes = safe_read(fd, &packet, sizeof(packet)); |
| 799 | if (bytes < 0) { |
| 800 | log1("Packet read error, ignoring"); |
| 801 | /* NB: possible down interface, etc. Caller should pause. */ |
| 802 | return bytes; /* returns -1 */ |
| 803 | } |
| 804 | |
| 805 | if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp))) { |
| 806 | log1("Packet is too short, ignoring"); |
| 807 | return -2; |
| 808 | } |
| 809 | |
| 810 | if (bytes < ntohs(packet.ip.tot_len)) { |
| 811 | /* packet is bigger than sizeof(packet), we did partial read */ |
| 812 | log1("Oversized packet, ignoring"); |
| 813 | return -2; |
| 814 | } |
| 815 | |
| 816 | /* ignore any extra garbage bytes */ |
| 817 | bytes = ntohs(packet.ip.tot_len); |
| 818 | |
| 819 | /* make sure its the right packet for us, and that it passes sanity checks */ |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 820 | if (packet.ip.protocol != IPPROTO_UDP |
| 821 | || packet.ip.version != IPVERSION |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 822 | || packet.ip.ihl != (sizeof(packet.ip) >> 2) |
| 823 | || packet.udp.dest != htons(CLIENT_PORT) |
| 824 | /* || bytes > (int) sizeof(packet) - can't happen */ |
| 825 | || ntohs(packet.udp.len) != (uint16_t)(bytes - sizeof(packet.ip)) |
| 826 | ) { |
| 827 | log1("Unrelated/bogus packet, ignoring"); |
| 828 | return -2; |
| 829 | } |
| 830 | |
| 831 | /* verify IP checksum */ |
| 832 | check = packet.ip.check; |
| 833 | packet.ip.check = 0; |
Baruch Siach | e8f3633 | 2011-09-07 17:52:37 +0200 | [diff] [blame] | 834 | if (check != inet_cksum((uint16_t *)&packet.ip, sizeof(packet.ip))) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 835 | log1("Bad IP header checksum, ignoring"); |
| 836 | return -2; |
| 837 | } |
| 838 | |
| 839 | /* verify UDP checksum. IP header has to be modified for this */ |
| 840 | memset(&packet.ip, 0, offsetof(struct iphdr, protocol)); |
| 841 | /* ip.xx fields which are not memset: protocol, check, saddr, daddr */ |
| 842 | packet.ip.tot_len = packet.udp.len; /* yes, this is needed */ |
| 843 | check = packet.udp.check; |
| 844 | packet.udp.check = 0; |
Baruch Siach | e8f3633 | 2011-09-07 17:52:37 +0200 | [diff] [blame] | 845 | if (check && check != inet_cksum((uint16_t *)&packet, bytes)) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 846 | log1("Packet with bad UDP checksum received, ignoring"); |
| 847 | return -2; |
| 848 | } |
| 849 | |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 850 | if (packet.data.cookie != htonl(DHCP_MAGIC)) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 851 | bb_info_msg("Packet with bad magic, ignoring"); |
| 852 | return -2; |
| 853 | } |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 854 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 855 | log1("Got valid DHCP packet"); |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 856 | udhcp_dump_packet(&packet.data); |
| 857 | |
| 858 | bytes -= sizeof(packet.ip) + sizeof(packet.udp); |
| 859 | memcpy(dhcp_pkt, &packet.data, bytes); |
| 860 | return bytes; |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 861 | } |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 862 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 863 | |
| 864 | /*** Main ***/ |
| 865 | |
| 866 | static int sockfd = -1; |
| 867 | |
| 868 | #define LISTEN_NONE 0 |
| 869 | #define LISTEN_KERNEL 1 |
| 870 | #define LISTEN_RAW 2 |
| 871 | static smallint listen_mode; |
| 872 | |
| 873 | /* initial state: (re)start DHCP negotiation */ |
| 874 | #define INIT_SELECTING 0 |
| 875 | /* discover was sent, DHCPOFFER reply received */ |
| 876 | #define REQUESTING 1 |
| 877 | /* select/renew was sent, DHCPACK reply received */ |
| 878 | #define BOUND 2 |
| 879 | /* half of lease passed, want to renew it by sending unicast renew requests */ |
| 880 | #define RENEWING 3 |
| 881 | /* renew requests were not answered, lease is almost over, send broadcast renew */ |
| 882 | #define REBINDING 4 |
| 883 | /* manually requested renew (SIGUSR1) */ |
| 884 | #define RENEW_REQUESTED 5 |
| 885 | /* release, possibly manually requested (SIGUSR2) */ |
| 886 | #define RELEASED 6 |
| 887 | static smallint state; |
| 888 | |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 889 | static int udhcp_raw_socket(int ifindex) |
| 890 | { |
| 891 | int fd; |
| 892 | struct sockaddr_ll sock; |
| 893 | |
| 894 | /* |
| 895 | * Comment: |
| 896 | * |
| 897 | * I've selected not to see LL header, so BPF doesn't see it, too. |
| 898 | * The filter may also pass non-IP and non-ARP packets, but we do |
| 899 | * a more complete check when receiving the message in userspace. |
| 900 | * |
| 901 | * and filter shamelessly stolen from: |
| 902 | * |
| 903 | * http://www.flamewarmaster.de/software/dhcpclient/ |
| 904 | * |
| 905 | * There are a few other interesting ideas on that page (look under |
| 906 | * "Motivation"). Use of netlink events is most interesting. Think |
| 907 | * of various network servers listening for events and reconfiguring. |
| 908 | * That would obsolete sending HUP signals and/or make use of restarts. |
| 909 | * |
| 910 | * Copyright: 2006, 2007 Stefan Rompf <sux@loplof.de>. |
| 911 | * License: GPL v2. |
| 912 | * |
| 913 | * TODO: make conditional? |
| 914 | */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 915 | static const struct sock_filter filter_instr[] = { |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 916 | /* load 9th byte (protocol) */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 917 | BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9), |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 918 | /* jump to L1 if it is IPPROTO_UDP, else to L4 */ |
| 919 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, IPPROTO_UDP, 0, 6), |
| 920 | /* L1: load halfword from offset 6 (flags and frag offset) */ |
| 921 | BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 6), |
| 922 | /* jump to L4 if any bits in frag offset field are set, else to L2 */ |
| 923 | BPF_JUMP(BPF_JMP|BPF_JSET|BPF_K, 0x1fff, 4, 0), |
| 924 | /* L2: skip IP header (load index reg with header len) */ |
| 925 | BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), |
| 926 | /* load udp destination port from halfword[header_len + 2] */ |
| 927 | BPF_STMT(BPF_LD|BPF_H|BPF_IND, 2), |
| 928 | /* jump to L3 if udp dport is CLIENT_PORT, else to L4 */ |
| 929 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 68, 0, 1), |
| 930 | /* L3: accept packet */ |
| 931 | BPF_STMT(BPF_RET|BPF_K, 0xffffffff), |
| 932 | /* L4: discard packet */ |
| 933 | BPF_STMT(BPF_RET|BPF_K, 0), |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 934 | }; |
| 935 | static const struct sock_fprog filter_prog = { |
| 936 | .len = sizeof(filter_instr) / sizeof(filter_instr[0]), |
| 937 | /* casting const away: */ |
| 938 | .filter = (struct sock_filter *) filter_instr, |
| 939 | }; |
| 940 | |
| 941 | log1("Opening raw socket on ifindex %d", ifindex); //log2? |
| 942 | |
| 943 | fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); |
| 944 | log1("Got raw socket fd %d", fd); //log2? |
| 945 | |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 946 | sock.sll_family = AF_PACKET; |
| 947 | sock.sll_protocol = htons(ETH_P_IP); |
| 948 | sock.sll_ifindex = ifindex; |
| 949 | xbind(fd, (struct sockaddr *) &sock, sizeof(sock)); |
| 950 | |
| 951 | if (CLIENT_PORT == 68) { |
| 952 | /* Use only if standard port is in use */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 953 | /* Ignoring error (kernel may lack support for this) */ |
| 954 | if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, |
| 955 | sizeof(filter_prog)) >= 0) |
| 956 | log1("Attached filter to raw socket fd %d", fd); // log? |
| 957 | } |
| 958 | |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 959 | log1("Created raw socket"); |
| 960 | |
| 961 | return fd; |
| 962 | } |
| 963 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 964 | static void change_listen_mode(int new_mode) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 965 | { |
Denys Vlasenko | 4945ed3 | 2009-06-17 11:58:11 +0200 | [diff] [blame] | 966 | log1("Entering listen mode: %s", |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 967 | new_mode != LISTEN_NONE |
| 968 | ? (new_mode == LISTEN_KERNEL ? "kernel" : "raw") |
| 969 | : "none" |
| 970 | ); |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 971 | |
| 972 | listen_mode = new_mode; |
Denis Vlasenko | fbd2918 | 2007-04-07 01:05:47 +0000 | [diff] [blame] | 973 | if (sockfd >= 0) { |
| 974 | close(sockfd); |
| 975 | sockfd = -1; |
| 976 | } |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 977 | if (new_mode == LISTEN_KERNEL) |
| 978 | sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface); |
| 979 | else if (new_mode != LISTEN_NONE) |
| 980 | sockfd = udhcp_raw_socket(client_config.ifindex); |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 981 | /* else LISTEN_NONE: sockfd stays closed */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 982 | } |
| 983 | |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 984 | /* Called only on SIGUSR1 */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 985 | static void perform_renew(void) |
| 986 | { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 987 | bb_info_msg("Performing a DHCP renew"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 988 | switch (state) { |
| 989 | case BOUND: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 990 | change_listen_mode(LISTEN_KERNEL); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 991 | case RENEWING: |
| 992 | case REBINDING: |
| 993 | state = RENEW_REQUESTED; |
| 994 | break; |
| 995 | case RENEW_REQUESTED: /* impatient are we? fine, square 1 */ |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 996 | udhcp_run_script(NULL, "deconfig"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 997 | case REQUESTING: |
| 998 | case RELEASED: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 999 | change_listen_mode(LISTEN_RAW); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1000 | state = INIT_SELECTING; |
| 1001 | break; |
| 1002 | case INIT_SELECTING: |
| 1003 | break; |
| 1004 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1005 | } |
| 1006 | |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1007 | static void perform_release(uint32_t requested_ip, uint32_t server_addr) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1008 | { |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 1009 | char buffer[sizeof("255.255.255.255")]; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1010 | struct in_addr temp_addr; |
| 1011 | |
| 1012 | /* send release packet */ |
| 1013 | if (state == BOUND || state == RENEWING || state == REBINDING) { |
| 1014 | temp_addr.s_addr = server_addr; |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 1015 | strcpy(buffer, inet_ntoa(temp_addr)); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1016 | temp_addr.s_addr = requested_ip; |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 1017 | bb_info_msg("Unicasting a release of %s to %s", |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1018 | inet_ntoa(temp_addr), buffer); |
| 1019 | send_release(server_addr, requested_ip); /* unicast */ |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 1020 | udhcp_run_script(NULL, "deconfig"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1021 | } |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 1022 | bb_info_msg("Entering released state"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1023 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1024 | change_listen_mode(LISTEN_NONE); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1025 | state = RELEASED; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1026 | } |
| 1027 | |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1028 | static uint8_t* alloc_dhcp_option(int code, const char *str, int extra) |
| 1029 | { |
| 1030 | uint8_t *storage; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1031 | int len = strnlen(str, 255); |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1032 | storage = xzalloc(len + extra + OPT_DATA); |
| 1033 | storage[OPT_CODE] = code; |
| 1034 | storage[OPT_LEN] = len + extra; |
| 1035 | memcpy(storage + extra + OPT_DATA, str, len); |
| 1036 | return storage; |
| 1037 | } |
| 1038 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1039 | #if BB_MMU |
| 1040 | static void client_background(void) |
| 1041 | { |
| 1042 | bb_daemonize(0); |
| 1043 | logmode &= ~LOGMODE_STDIO; |
| 1044 | /* rewrite pidfile, as our pid is different now */ |
| 1045 | write_pidfile(client_config.pidfile); |
| 1046 | } |
| 1047 | #endif |
| 1048 | |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1049 | //usage:#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 |
| 1050 | //usage:# define IF_UDHCP_VERBOSE(...) __VA_ARGS__ |
| 1051 | //usage:#else |
| 1052 | //usage:# define IF_UDHCP_VERBOSE(...) |
| 1053 | //usage:#endif |
| 1054 | //usage:#define udhcpc_trivial_usage |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1055 | //usage: "[-fbnq"IF_UDHCP_VERBOSE("v")"oCRB] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]\n" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1056 | //usage: " [-H HOSTNAME] [-V VENDOR] [-x OPT:VAL]... [-O OPT]..." IF_FEATURE_UDHCP_PORT(" [-P N]") |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1057 | //usage:#define udhcpc_full_usage "\n" |
| 1058 | //usage: IF_LONG_OPTS( |
| 1059 | //usage: "\n -i,--interface IFACE Interface to use (default eth0)" |
| 1060 | //usage: "\n -p,--pidfile FILE Create pidfile" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1061 | //usage: "\n -s,--script PROG Run PROG at DHCP events (default "CONFIG_UDHCPC_DEFAULT_SCRIPT")" |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1062 | //usage: "\n -B,--broadcast Request broadcast replies" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1063 | //usage: "\n -t,--retries N Send up to N discover packets" |
| 1064 | //usage: "\n -T,--timeout N Pause between packets (default 3 seconds)" |
| 1065 | //usage: "\n -A,--tryagain N Wait N seconds after failure (default 20)" |
| 1066 | //usage: "\n -f,--foreground Run in foreground" |
| 1067 | //usage: USE_FOR_MMU( |
| 1068 | //usage: "\n -b,--background Background if lease is not obtained" |
| 1069 | //usage: ) |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1070 | //usage: "\n -n,--now Exit if lease is not obtained" |
| 1071 | //usage: "\n -q,--quit Exit after obtaining lease" |
| 1072 | //usage: "\n -R,--release Release IP on exit" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1073 | //usage: "\n -S,--syslog Log to syslog too" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1074 | //usage: IF_FEATURE_UDHCP_PORT( |
| 1075 | //usage: "\n -P,--client-port N Use port N (default 68)" |
| 1076 | //usage: ) |
| 1077 | //usage: IF_FEATURE_UDHCPC_ARPING( |
| 1078 | //usage: "\n -a,--arping Use arping to validate offered address" |
| 1079 | //usage: ) |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1080 | //usage: "\n -O,--request-option OPT Request option OPT from server (cumulative)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1081 | //usage: "\n -o,--no-default-options Don't request any options (unless -O is given)" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1082 | //usage: "\n -r,--request IP Request this IP address" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1083 | //usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1084 | //usage: "\n Examples of string, numeric, and hex byte opts:" |
| 1085 | //usage: "\n -x hostname:bbox - option 12" |
| 1086 | //usage: "\n -x lease:3600 - option 51 (lease time)" |
| 1087 | //usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1088 | //usage: "\n -F,--fqdn NAME Ask server to update DNS mapping for NAME" |
| 1089 | //usage: "\n -H,-h,--hostname NAME Send NAME as client hostname (default none)" |
| 1090 | //usage: "\n -V,--vendorclass VENDOR Vendor identifier (default 'udhcp VERSION')" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1091 | //usage: "\n -C,--clientid-none Don't send MAC as client identifier" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1092 | //usage: IF_UDHCP_VERBOSE( |
| 1093 | //usage: "\n -v Verbose" |
| 1094 | //usage: ) |
| 1095 | //usage: ) |
| 1096 | //usage: IF_NOT_LONG_OPTS( |
| 1097 | //usage: "\n -i IFACE Interface to use (default eth0)" |
| 1098 | //usage: "\n -p FILE Create pidfile" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1099 | //usage: "\n -s PROG Run PROG at DHCP events (default "CONFIG_UDHCPC_DEFAULT_SCRIPT")" |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1100 | //usage: "\n -B Request broadcast replies" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1101 | //usage: "\n -t N Send up to N discover packets" |
| 1102 | //usage: "\n -T N Pause between packets (default 3 seconds)" |
| 1103 | //usage: "\n -A N Wait N seconds (default 20) after failure" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1104 | //usage: "\n -f Run in foreground" |
| 1105 | //usage: USE_FOR_MMU( |
| 1106 | //usage: "\n -b Background if lease is not obtained" |
| 1107 | //usage: ) |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1108 | //usage: "\n -n Exit if lease is not obtained" |
| 1109 | //usage: "\n -q Exit after obtaining lease" |
| 1110 | //usage: "\n -R Release IP on exit" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1111 | //usage: "\n -S Log to syslog too" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1112 | //usage: IF_FEATURE_UDHCP_PORT( |
| 1113 | //usage: "\n -P N Use port N (default 68)" |
| 1114 | //usage: ) |
| 1115 | //usage: IF_FEATURE_UDHCPC_ARPING( |
| 1116 | //usage: "\n -a Use arping to validate offered address" |
| 1117 | //usage: ) |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1118 | //usage: "\n -O OPT Request option OPT from server (cumulative)" |
| 1119 | //usage: "\n -o Don't request any options (unless -O is given)" |
| 1120 | //usage: "\n -r IP Request this IP address" |
| 1121 | //usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)" |
| 1122 | //usage: "\n Examples of string, numeric, and hex byte opts:" |
| 1123 | //usage: "\n -x hostname:bbox - option 12" |
| 1124 | //usage: "\n -x lease:3600 - option 51 (lease time)" |
| 1125 | //usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1126 | //usage: "\n -F NAME Ask server to update DNS mapping for NAME" |
| 1127 | //usage: "\n -H,-h NAME Send NAME as client hostname (default none)" |
| 1128 | //usage: "\n -V VENDOR Vendor identifier (default 'udhcp VERSION')" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1129 | //usage: "\n -C Don't send MAC as client identifier" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1130 | //usage: IF_UDHCP_VERBOSE( |
| 1131 | //usage: "\n -v Verbose" |
| 1132 | //usage: ) |
| 1133 | //usage: ) |
Denys Vlasenko | 8993c3f | 2010-12-25 06:21:54 +0100 | [diff] [blame] | 1134 | //usage: "\nSignals:" |
| 1135 | //usage: "\n USR1 Renew current lease" |
| 1136 | //usage: "\n USR2 Release current lease" |
| 1137 | |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1138 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 1139 | int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 1140 | int udhcpc_main(int argc UNUSED_PARAM, char **argv) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1141 | { |
| 1142 | uint8_t *temp, *message; |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1143 | const char *str_V, *str_h, *str_F, *str_r; |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1144 | IF_FEATURE_UDHCP_PORT(char *str_P;) |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1145 | void *clientid_mac_ptr; |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1146 | llist_t *list_O = NULL; |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1147 | llist_t *list_x = NULL; |
Denis Vlasenko | 68af8e7 | 2007-11-22 21:41:14 +0000 | [diff] [blame] | 1148 | int tryagain_timeout = 20; |
| 1149 | int discover_timeout = 3; |
| 1150 | int discover_retries = 3; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1151 | uint32_t server_addr = server_addr; /* for compiler */ |
| 1152 | uint32_t requested_ip = 0; |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 1153 | uint32_t xid = 0; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1154 | uint32_t lease_seconds = 0; /* can be given as 32-bit quantity */ |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1155 | int packet_num; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1156 | int timeout; /* must be signed */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1157 | unsigned already_waited_sec; |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1158 | unsigned opt; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1159 | int max_fd; |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1160 | int retval; |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1161 | struct timeval tv; |
Denys Vlasenko | 31af3d5 | 2009-06-17 11:57:09 +0200 | [diff] [blame] | 1162 | struct dhcp_packet packet; |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1163 | fd_set rfds; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1164 | |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1165 | /* Default options */ |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1166 | IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;) |
| 1167 | IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;) |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1168 | client_config.interface = "eth0"; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1169 | client_config.script = CONFIG_UDHCPC_DEFAULT_SCRIPT; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1170 | str_V = "udhcp "BB_VER; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1171 | |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1172 | /* Parse command line */ |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1173 | /* O,x: list; -T,-t,-A take numeric param */ |
Leonid Lisovskiy | 6c9c0a1 | 2011-10-18 00:35:47 +0200 | [diff] [blame] | 1174 | opt_complementary = "O::x::T+:t+:A+" IF_UDHCP_VERBOSE(":vv") ; |
Denys Vlasenko | f3b92d3 | 2009-06-19 12:10:38 +0200 | [diff] [blame] | 1175 | IF_LONG_OPTS(applet_long_options = udhcpc_longopts;) |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1176 | opt = getopt32(argv, "CV:H:h:F:i:np:qRr:s:T:t:SA:O:ox:fB" |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1177 | USE_FOR_MMU("b") |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1178 | IF_FEATURE_UDHCPC_ARPING("a") |
| 1179 | IF_FEATURE_UDHCP_PORT("P:") |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1180 | "v" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1181 | , &str_V, &str_h, &str_h, &str_F |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1182 | , &client_config.interface, &client_config.pidfile, &str_r /* i,p */ |
| 1183 | , &client_config.script /* s */ |
| 1184 | , &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */ |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1185 | , &list_O |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1186 | , &list_x |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1187 | IF_FEATURE_UDHCP_PORT(, &str_P) |
Leonid Lisovskiy | 6c9c0a1 | 2011-10-18 00:35:47 +0200 | [diff] [blame] | 1188 | IF_UDHCP_VERBOSE(, &dhcp_verbose) |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1189 | ); |
Denis Vlasenko | 68af8e7 | 2007-11-22 21:41:14 +0000 | [diff] [blame] | 1190 | if (opt & (OPT_h|OPT_H)) |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1191 | client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0); |
| 1192 | if (opt & OPT_F) { |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1193 | /* FQDN option format: [0x51][len][flags][0][0]<fqdn> */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1194 | client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3); |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1195 | /* Flag bits: 0000NEOS |
| 1196 | * S: 1 = Client requests server to update A RR in DNS as well as PTR |
| 1197 | * O: 1 = Server indicates to client that DNS has been updated regardless |
| 1198 | * E: 1 = Name is in DNS format, i.e. <4>host<6>domain<3>com<0>, |
| 1199 | * not "host.domain.com". Format 0 is obsolete. |
| 1200 | * N: 1 = Client requests server to not update DNS (S must be 0 then) |
| 1201 | * Two [0] bytes which follow are deprecated and must be 0. |
| 1202 | */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1203 | client_config.fqdn[OPT_DATA + 0] = 0x1; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1204 | /*client_config.fqdn[OPT_DATA + 1] = 0; - xzalloc did it */ |
| 1205 | /*client_config.fqdn[OPT_DATA + 2] = 0; */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1206 | } |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1207 | if (opt & OPT_r) |
| 1208 | requested_ip = inet_addr(str_r); |
Denis Vlasenko | d55fe3e | 2008-02-04 13:12:16 +0000 | [diff] [blame] | 1209 | #if ENABLE_FEATURE_UDHCP_PORT |
| 1210 | if (opt & OPT_P) { |
| 1211 | CLIENT_PORT = xatou16(str_P); |
| 1212 | SERVER_PORT = CLIENT_PORT - 1; |
| 1213 | } |
| 1214 | #endif |
Denis Vlasenko | 2e4c3c4 | 2008-04-02 13:04:19 +0000 | [diff] [blame] | 1215 | if (opt & OPT_o) |
| 1216 | client_config.no_default_options = 1; |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1217 | while (list_O) { |
Denis Vlasenko | 18c9302 | 2008-08-27 22:29:43 +0000 | [diff] [blame] | 1218 | char *optstr = llist_pop(&list_O); |
Denys Vlasenko | 5d3aace | 2011-06-04 05:07:16 +0200 | [diff] [blame] | 1219 | unsigned n = bb_strtou(optstr, NULL, 0); |
| 1220 | if (errno || n > 254) { |
| 1221 | n = udhcp_option_idx(optstr); |
| 1222 | n = dhcp_optflags[n].code; |
| 1223 | } |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1224 | client_config.opt_mask[n >> 3] |= 1 << (n & 7); |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1225 | } |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1226 | while (list_x) { |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1227 | char *optstr = llist_pop(&list_x); |
| 1228 | char *colon = strchr(optstr, ':'); |
| 1229 | if (colon) |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1230 | *colon = ' '; |
Denys Vlasenko | 9c0ea86 | 2010-04-04 02:12:03 +0200 | [diff] [blame] | 1231 | /* now it looks similar to udhcpd's config file line: |
| 1232 | * "optname optval", using the common routine: */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1233 | udhcp_str2optset(optstr, &client_config.options); |
| 1234 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1235 | |
Denys Vlasenko | 26918dd | 2009-06-16 12:04:23 +0200 | [diff] [blame] | 1236 | if (udhcp_read_interface(client_config.interface, |
| 1237 | &client_config.ifindex, |
| 1238 | NULL, |
| 1239 | client_config.client_mac) |
| 1240 | ) { |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1241 | return 1; |
Denys Vlasenko | 26918dd | 2009-06-16 12:04:23 +0200 | [diff] [blame] | 1242 | } |
| 1243 | |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1244 | clientid_mac_ptr = NULL; |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1245 | if (!(opt & OPT_C) && !udhcp_find_option(client_config.options, DHCP_CLIENT_ID)) { |
| 1246 | /* not suppressed and not set, set the default client ID */ |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1247 | client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7); |
| 1248 | client_config.clientid[OPT_DATA] = 1; /* type: ethernet */ |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1249 | clientid_mac_ptr = client_config.clientid + OPT_DATA+1; |
| 1250 | memcpy(clientid_mac_ptr, client_config.client_mac, 6); |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1251 | } |
| 1252 | if (str_V[0] != '\0') |
| 1253 | client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1254 | #if !BB_MMU |
| 1255 | /* on NOMMU reexec (i.e., background) early */ |
| 1256 | if (!(opt & OPT_f)) { |
| 1257 | bb_daemonize_or_rexec(0 /* flags */, argv); |
Denis Vlasenko | a19e649 | 2009-03-11 14:40:00 +0000 | [diff] [blame] | 1258 | logmode = LOGMODE_NONE; |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1259 | } |
| 1260 | #endif |
| 1261 | if (opt & OPT_S) { |
Denis Vlasenko | 5e4fda0 | 2009-03-08 23:46:48 +0000 | [diff] [blame] | 1262 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1263 | logmode |= LOGMODE_SYSLOG; |
| 1264 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1265 | |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1266 | /* Make sure fd 0,1,2 are open */ |
| 1267 | bb_sanitize_stdio(); |
| 1268 | /* Equivalent of doing a fflush after every \n */ |
| 1269 | setlinebuf(stdout); |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1270 | /* Create pidfile */ |
| 1271 | write_pidfile(client_config.pidfile); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1272 | /* Goes to stdout (unless NOMMU) and possibly syslog */ |
Denis Vlasenko | def8898 | 2007-10-07 17:06:01 +0000 | [diff] [blame] | 1273 | bb_info_msg("%s (v"BB_VER") started", applet_name); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1274 | /* Set up the signal pipe */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1275 | udhcp_sp_setup(); |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 1276 | /* We want random_xid to be random... */ |
| 1277 | srand(monotonic_us()); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1278 | |
| 1279 | state = INIT_SELECTING; |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 1280 | udhcp_run_script(NULL, "deconfig"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1281 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1282 | packet_num = 0; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1283 | timeout = 0; |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1284 | already_waited_sec = 0; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1285 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1286 | /* Main event loop. select() waits on signal pipe and possibly |
| 1287 | * on sockfd. |
| 1288 | * "continue" statements in code below jump to the top of the loop. |
| 1289 | */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1290 | for (;;) { |
Denis Vlasenko | ec64a57 | 2009-01-14 00:28:03 +0000 | [diff] [blame] | 1291 | /* silence "uninitialized!" warning */ |
| 1292 | unsigned timestamp_before_wait = timestamp_before_wait; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1293 | |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 1294 | //bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode); |
| 1295 | |
| 1296 | /* Was opening raw or udp socket here |
| 1297 | * if (listen_mode != LISTEN_NONE && sockfd < 0), |
| 1298 | * but on fast network renew responses return faster |
| 1299 | * than we open sockets. Thus this code is moved |
| 1300 | * to change_listen_mode(). Thus we open listen socket |
| 1301 | * BEFORE we send renew request (see "case BOUND:"). */ |
| 1302 | |
Denis Vlasenko | fbd2918 | 2007-04-07 01:05:47 +0000 | [diff] [blame] | 1303 | max_fd = udhcp_sp_fd_set(&rfds, sockfd); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1304 | |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1305 | tv.tv_sec = timeout - already_waited_sec; |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1306 | tv.tv_usec = 0; |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 1307 | retval = 0; |
| 1308 | /* If we already timed out, fall through with retval = 0, else... */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1309 | if ((int)tv.tv_sec > 0) { |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1310 | timestamp_before_wait = (unsigned)monotonic_sec(); |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1311 | log1("Waiting on select..."); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1312 | retval = select(max_fd + 1, &rfds, NULL, NULL, &tv); |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1313 | if (retval < 0) { |
| 1314 | /* EINTR? A signal was caught, don't panic */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1315 | if (errno == EINTR) { |
| 1316 | already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait; |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1317 | continue; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1318 | } |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1319 | /* Else: an error occured, panic! */ |
| 1320 | bb_perror_msg_and_die("select"); |
| 1321 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1322 | } |
| 1323 | |
| 1324 | /* If timeout dropped to zero, time to become active: |
| 1325 | * resend discover/renew/whatever |
| 1326 | */ |
| 1327 | if (retval == 0) { |
Denys Vlasenko | a5048fa | 2010-10-20 21:38:29 +0200 | [diff] [blame] | 1328 | /* When running on a bridge, the ifindex may have changed |
| 1329 | * (e.g. if member interfaces were added/removed |
| 1330 | * or if the status of the bridge changed). |
| 1331 | * Refresh ifindex and client_mac: |
| 1332 | */ |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1333 | if (udhcp_read_interface(client_config.interface, |
| 1334 | &client_config.ifindex, |
| 1335 | NULL, |
| 1336 | client_config.client_mac) |
| 1337 | ) { |
| 1338 | return 1; /* iface is gone? */ |
| 1339 | } |
| 1340 | if (clientid_mac_ptr) |
| 1341 | memcpy(clientid_mac_ptr, client_config.client_mac, 6); |
Denys Vlasenko | a5048fa | 2010-10-20 21:38:29 +0200 | [diff] [blame] | 1342 | |
Denis Vlasenko | f1980f6 | 2008-09-26 09:34:59 +0000 | [diff] [blame] | 1343 | /* We will restart the wait in any case */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1344 | already_waited_sec = 0; |
| 1345 | |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1346 | switch (state) { |
| 1347 | case INIT_SELECTING: |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1348 | if (packet_num < discover_retries) { |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1349 | if (packet_num == 0) |
| 1350 | xid = random_xid(); |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1351 | /* broadcast */ |
| 1352 | send_discover(xid, requested_ip); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1353 | timeout = discover_timeout; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1354 | packet_num++; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1355 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1356 | } |
Denis Vlasenko | cdb0b65 | 2008-09-26 09:34:15 +0000 | [diff] [blame] | 1357 | leasefail: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1358 | udhcp_run_script(NULL, "leasefail"); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1359 | #if BB_MMU /* -b is not supported on NOMMU */ |
| 1360 | if (opt & OPT_b) { /* background if no lease */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1361 | bb_info_msg("No lease, forking to background"); |
| 1362 | client_background(); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1363 | /* do not background again! */ |
| 1364 | opt = ((opt & ~OPT_b) | OPT_f); |
| 1365 | } else |
| 1366 | #endif |
| 1367 | if (opt & OPT_n) { /* abort if no lease */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1368 | bb_info_msg("No lease, failing"); |
| 1369 | retval = 1; |
| 1370 | goto ret; |
| 1371 | } |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1372 | /* wait before trying again */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1373 | timeout = tryagain_timeout; |
| 1374 | packet_num = 0; |
| 1375 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1376 | case REQUESTING: |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1377 | if (packet_num < discover_retries) { |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1378 | /* send broadcast select packet */ |
| 1379 | send_select(xid, server_addr, requested_ip); |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1380 | timeout = discover_timeout; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1381 | packet_num++; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1382 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1383 | } |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1384 | /* Timed out, go back to init state. |
| 1385 | * "discover...select...discover..." loops |
Denis Vlasenko | 7d9399e | 2008-09-26 22:21:03 +0000 | [diff] [blame] | 1386 | * were seen in the wild. Treat them similarly |
Denis Vlasenko | cdb0b65 | 2008-09-26 09:34:15 +0000 | [diff] [blame] | 1387 | * to "no response to discover" case */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1388 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | 7d9399e | 2008-09-26 22:21:03 +0000 | [diff] [blame] | 1389 | state = INIT_SELECTING; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1390 | goto leasefail; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1391 | case BOUND: |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1392 | /* 1/2 lease passed, enter renewing state */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1393 | state = RENEWING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1394 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1395 | change_listen_mode(LISTEN_KERNEL); |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1396 | log1("Entering renew state"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1397 | /* fall right through */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1398 | case RENEW_REQUESTED: /* manual (SIGUSR1) renew */ |
| 1399 | case_RENEW_REQUESTED: |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1400 | case RENEWING: |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1401 | if (timeout > 60) { |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1402 | /* send an unicast renew request */ |
| 1403 | /* Sometimes observed to fail (EADDRNOTAVAIL) to bind |
| 1404 | * a new UDP socket for sending inside send_renew. |
| 1405 | * I hazard to guess existing listening socket |
| 1406 | * is somehow conflicting with it, but why is it |
| 1407 | * not deterministic then?! Strange. |
Denys Vlasenko | 753a3ce | 2009-07-19 04:27:10 +0200 | [diff] [blame] | 1408 | * Anyway, it does recover by eventually failing through |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1409 | * into INIT_SELECTING state. |
| 1410 | */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1411 | send_renew(xid, server_addr, requested_ip); |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1412 | timeout >>= 1; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1413 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1414 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1415 | /* Timed out, enter rebinding state */ |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1416 | log1("Entering rebinding state"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1417 | state = REBINDING; |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1418 | /* fall right through */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1419 | case REBINDING: |
Denys Vlasenko | 219757f | 2009-10-08 23:05:46 +0200 | [diff] [blame] | 1420 | /* Switch to bcast receive */ |
| 1421 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1422 | /* Lease is *really* about to run out, |
| 1423 | * try to find DHCP server using broadcast */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1424 | if (timeout > 0) { |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1425 | /* send a broadcast renew request */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1426 | send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1427 | timeout >>= 1; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1428 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1429 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1430 | /* Timed out, enter init state */ |
| 1431 | bb_info_msg("Lease lost, entering init state"); |
| 1432 | udhcp_run_script(NULL, "deconfig"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1433 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1434 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1435 | /*timeout = 0; - already is */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1436 | packet_num = 0; |
| 1437 | continue; |
| 1438 | /* case RELEASED: */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1439 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1440 | /* yah, I know, *you* say it would never happen */ |
| 1441 | timeout = INT_MAX; |
| 1442 | continue; /* back to main loop */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1443 | } /* if select timed out */ |
| 1444 | |
| 1445 | /* select() didn't timeout, something happened */ |
| 1446 | |
| 1447 | /* Is it a signal? */ |
| 1448 | /* note: udhcp_sp_read checks FD_ISSET before reading */ |
| 1449 | switch (udhcp_sp_read(&rfds)) { |
| 1450 | case SIGUSR1: |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1451 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1452 | already_waited_sec = 0; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1453 | perform_renew(); |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1454 | if (state == RENEW_REQUESTED) { |
| 1455 | /* We might be either on the same network |
| 1456 | * (in which case renew might work), |
| 1457 | * or we might be on a completely different one |
| 1458 | * (in which case renew won't ever succeed). |
| 1459 | * For the second case, must make sure timeout |
| 1460 | * is not too big, or else we can send |
| 1461 | * futile renew requests for hours. |
| 1462 | * (Ab)use -A TIMEOUT value (usually 20 sec) |
| 1463 | * as a cap on the timeout. |
| 1464 | */ |
| 1465 | if (timeout > tryagain_timeout) |
| 1466 | timeout = tryagain_timeout; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1467 | goto case_RENEW_REQUESTED; |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1468 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1469 | /* Start things over */ |
| 1470 | packet_num = 0; |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1471 | /* Kill any timeouts, user wants this to hurry along */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1472 | timeout = 0; |
| 1473 | continue; |
| 1474 | case SIGUSR2: |
| 1475 | perform_release(requested_ip, server_addr); |
| 1476 | timeout = INT_MAX; |
| 1477 | continue; |
| 1478 | case SIGTERM: |
| 1479 | bb_info_msg("Received SIGTERM"); |
| 1480 | if (opt & OPT_R) /* release on quit */ |
| 1481 | perform_release(requested_ip, server_addr); |
| 1482 | goto ret0; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1483 | } |
| 1484 | |
Denis Vlasenko | 739e30f | 2008-09-26 23:45:20 +0000 | [diff] [blame] | 1485 | /* Is it a packet? */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1486 | if (listen_mode == LISTEN_NONE || !FD_ISSET(sockfd, &rfds)) |
| 1487 | continue; /* no */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1488 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1489 | { |
| 1490 | int len; |
| 1491 | |
| 1492 | /* A packet is ready, read it */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1493 | if (listen_mode == LISTEN_KERNEL) |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1494 | len = udhcp_recv_kernel_packet(&packet, sockfd); |
Denis Vlasenko | b76b9a4 | 2008-01-25 22:46:34 +0000 | [diff] [blame] | 1495 | else |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1496 | len = udhcp_recv_raw_packet(&packet, sockfd); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1497 | if (len == -1) { |
| 1498 | /* Error is severe, reopen socket */ |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1499 | bb_info_msg("Read error: %s, reopening socket", strerror(errno)); |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1500 | sleep(discover_timeout); /* 3 seconds by default */ |
| 1501 | change_listen_mode(listen_mode); /* just close and reopen */ |
| 1502 | } |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1503 | /* If this packet will turn out to be unrelated/bogus, |
| 1504 | * we will go back and wait for next one. |
| 1505 | * Be sure timeout is properly decreased. */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1506 | already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait; |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1507 | if (len < 0) |
| 1508 | continue; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1509 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1510 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1511 | if (packet.xid != xid) { |
| 1512 | log1("xid %x (our is %x), ignoring packet", |
| 1513 | (unsigned)packet.xid, (unsigned)xid); |
| 1514 | continue; |
| 1515 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1516 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1517 | /* Ignore packets that aren't for us */ |
| 1518 | if (packet.hlen != 6 |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 1519 | || memcmp(packet.chaddr, client_config.client_mac, 6) != 0 |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1520 | ) { |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1521 | //FIXME: need to also check that last 10 bytes are zero |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1522 | log1("chaddr does not match, ignoring packet"); // log2? |
| 1523 | continue; |
| 1524 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1525 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1526 | message = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1527 | if (message == NULL) { |
| 1528 | bb_error_msg("no message type option, ignoring packet"); |
| 1529 | continue; |
| 1530 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1531 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1532 | switch (state) { |
| 1533 | case INIT_SELECTING: |
| 1534 | /* Must be a DHCPOFFER to one of our xid's */ |
| 1535 | if (*message == DHCPOFFER) { |
| 1536 | /* TODO: why we don't just fetch server's IP from IP header? */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1537 | temp = udhcp_get_option(&packet, DHCP_SERVER_ID); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1538 | if (!temp) { |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 1539 | bb_error_msg("no server ID, ignoring packet"); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1540 | continue; |
| 1541 | /* still selecting - this server looks bad */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1542 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1543 | /* it IS unaligned sometimes, don't "optimize" */ |
| 1544 | move_from_unaligned32(server_addr, temp); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 1545 | /*xid = packet.xid; - already is */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1546 | requested_ip = packet.yiaddr; |
| 1547 | |
| 1548 | /* enter requesting state */ |
| 1549 | state = REQUESTING; |
| 1550 | timeout = 0; |
| 1551 | packet_num = 0; |
| 1552 | already_waited_sec = 0; |
| 1553 | } |
| 1554 | continue; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1555 | case REQUESTING: |
| 1556 | case RENEWING: |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1557 | case RENEW_REQUESTED: |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1558 | case REBINDING: |
| 1559 | if (*message == DHCPACK) { |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1560 | temp = udhcp_get_option(&packet, DHCP_LEASE_TIME); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1561 | if (!temp) { |
| 1562 | bb_error_msg("no lease time with ACK, using 1 hour lease"); |
| 1563 | lease_seconds = 60 * 60; |
| 1564 | } else { |
| 1565 | /* it IS unaligned sometimes, don't "optimize" */ |
| 1566 | move_from_unaligned32(lease_seconds, temp); |
| 1567 | lease_seconds = ntohl(lease_seconds); |
| 1568 | lease_seconds &= 0x0fffffff; /* paranoia: must not be prone to overflows */ |
| 1569 | if (lease_seconds < 10) /* and not too small */ |
| 1570 | lease_seconds = 10; |
| 1571 | } |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1572 | #if ENABLE_FEATURE_UDHCPC_ARPING |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1573 | if (opt & OPT_a) { |
Denis Vlasenko | 739e30f | 2008-09-26 23:45:20 +0000 | [diff] [blame] | 1574 | /* RFC 2131 3.1 paragraph 5: |
| 1575 | * "The client receives the DHCPACK message with configuration |
| 1576 | * parameters. The client SHOULD perform a final check on the |
| 1577 | * parameters (e.g., ARP for allocated network address), and notes |
| 1578 | * the duration of the lease specified in the DHCPACK message. At this |
| 1579 | * point, the client is configured. If the client detects that the |
| 1580 | * address is already in use (e.g., through the use of ARP), |
| 1581 | * the client MUST send a DHCPDECLINE message to the server and restarts |
| 1582 | * the configuration process..." */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1583 | if (!arpping(packet.yiaddr, |
| 1584 | NULL, |
| 1585 | (uint32_t) 0, |
| 1586 | client_config.client_mac, |
| 1587 | client_config.interface) |
| 1588 | ) { |
| 1589 | bb_info_msg("Offered address is in use " |
| 1590 | "(got ARP reply), declining"); |
| 1591 | send_decline(xid, server_addr, packet.yiaddr); |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1592 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1593 | if (state != REQUESTING) |
| 1594 | udhcp_run_script(NULL, "deconfig"); |
| 1595 | change_listen_mode(LISTEN_RAW); |
| 1596 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1597 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1598 | requested_ip = 0; |
| 1599 | timeout = tryagain_timeout; |
| 1600 | packet_num = 0; |
| 1601 | already_waited_sec = 0; |
| 1602 | continue; /* back to main loop */ |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1603 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1604 | } |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1605 | #endif |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1606 | /* enter bound state */ |
| 1607 | timeout = lease_seconds / 2; |
| 1608 | { |
| 1609 | struct in_addr temp_addr; |
| 1610 | temp_addr.s_addr = packet.yiaddr; |
| 1611 | bb_info_msg("Lease of %s obtained, lease time %u", |
| 1612 | inet_ntoa(temp_addr), (unsigned)lease_seconds); |
| 1613 | } |
| 1614 | requested_ip = packet.yiaddr; |
Denys Vlasenko | 4abfc26 | 2009-07-19 04:35:16 +0200 | [diff] [blame] | 1615 | udhcp_run_script(&packet, state == REQUESTING ? "bound" : "renew"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1616 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1617 | state = BOUND; |
| 1618 | change_listen_mode(LISTEN_NONE); |
| 1619 | if (opt & OPT_q) { /* quit after lease */ |
| 1620 | if (opt & OPT_R) /* release on quit */ |
| 1621 | perform_release(requested_ip, server_addr); |
| 1622 | goto ret0; |
| 1623 | } |
Justin Maggard | aa369e0 | 2009-08-13 01:26:17 +0200 | [diff] [blame] | 1624 | /* future renew failures should not exit (JM) */ |
| 1625 | opt &= ~OPT_n; |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1626 | #if BB_MMU /* NOMMU case backgrounded earlier */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1627 | if (!(opt & OPT_f)) { |
| 1628 | client_background(); |
| 1629 | /* do not background again! */ |
| 1630 | opt = ((opt & ~OPT_b) | OPT_f); |
| 1631 | } |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1632 | #endif |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1633 | already_waited_sec = 0; |
| 1634 | continue; /* back to main loop */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1635 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1636 | if (*message == DHCPNAK) { |
| 1637 | /* return to init state */ |
| 1638 | bb_info_msg("Received DHCP NAK"); |
| 1639 | udhcp_run_script(&packet, "nak"); |
| 1640 | if (state != REQUESTING) |
| 1641 | udhcp_run_script(NULL, "deconfig"); |
| 1642 | change_listen_mode(LISTEN_RAW); |
| 1643 | sleep(3); /* avoid excessive network traffic */ |
| 1644 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1645 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1646 | requested_ip = 0; |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1647 | timeout = 0; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1648 | packet_num = 0; |
| 1649 | already_waited_sec = 0; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1650 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1651 | continue; |
| 1652 | /* case BOUND: - ignore all packets */ |
| 1653 | /* case RELEASED: - ignore all packets */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1654 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1655 | /* back to main loop */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1656 | } /* for (;;) - main loop ends */ |
| 1657 | |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 1658 | ret0: |
| 1659 | retval = 0; |
| 1660 | ret: |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1661 | /*if (client_config.pidfile) - remove_pidfile has its own check */ |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 1662 | remove_pidfile(client_config.pidfile); |
| 1663 | return retval; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1664 | } |