"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 | |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [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" |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 49 | "retries\0" Required_argument "t" |
| 50 | "tryagain\0" Required_argument "A" |
| 51 | "syslog\0" No_argument "S" |
| 52 | "request-option\0" Required_argument "O" |
| 53 | "no-default-options\0" No_argument "o" |
| 54 | "foreground\0" No_argument "f" |
| 55 | "background\0" No_argument "b" |
| 56 | "broadcast\0" No_argument "B" |
| 57 | IF_FEATURE_UDHCPC_ARPING("arping\0" No_argument "a") |
| 58 | IF_FEATURE_UDHCP_PORT("client-port\0" Required_argument "P") |
| 59 | ; |
| 60 | #endif |
| 61 | /* Must match getopt32 option string order */ |
| 62 | enum { |
| 63 | OPT_C = 1 << 0, |
| 64 | OPT_V = 1 << 1, |
| 65 | OPT_H = 1 << 2, |
| 66 | OPT_h = 1 << 3, |
| 67 | OPT_F = 1 << 4, |
| 68 | OPT_i = 1 << 5, |
| 69 | OPT_n = 1 << 6, |
| 70 | OPT_p = 1 << 7, |
| 71 | OPT_q = 1 << 8, |
| 72 | OPT_R = 1 << 9, |
| 73 | OPT_r = 1 << 10, |
| 74 | OPT_s = 1 << 11, |
| 75 | OPT_T = 1 << 12, |
| 76 | OPT_t = 1 << 13, |
| 77 | OPT_S = 1 << 14, |
| 78 | OPT_A = 1 << 15, |
| 79 | OPT_O = 1 << 16, |
| 80 | OPT_o = 1 << 17, |
| 81 | OPT_x = 1 << 18, |
| 82 | OPT_f = 1 << 19, |
| 83 | OPT_B = 1 << 20, |
| 84 | /* The rest has variable bit positions, need to be clever */ |
| 85 | OPTBIT_B = 20, |
| 86 | USE_FOR_MMU( OPTBIT_b,) |
| 87 | IF_FEATURE_UDHCPC_ARPING(OPTBIT_a,) |
| 88 | IF_FEATURE_UDHCP_PORT( OPTBIT_P,) |
| 89 | USE_FOR_MMU( OPT_b = 1 << OPTBIT_b,) |
| 90 | IF_FEATURE_UDHCPC_ARPING(OPT_a = 1 << OPTBIT_a,) |
| 91 | IF_FEATURE_UDHCP_PORT( OPT_P = 1 << OPTBIT_P,) |
| 92 | }; |
| 93 | |
| 94 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 95 | /*** Script execution code ***/ |
| 96 | |
| 97 | /* get a rough idea of how long an option will be (rounding up...) */ |
| 98 | static const uint8_t len_of_option_as_string[] = { |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 99 | [OPTION_IP ] = sizeof("255.255.255.255 "), |
| 100 | [OPTION_IP_PAIR ] = sizeof("255.255.255.255 ") * 2, |
| 101 | [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] | 102 | [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] | 103 | [OPTION_STRING ] = 1, |
Denys Vlasenko | d2266d4 | 2012-04-22 03:37:01 +0200 | [diff] [blame] | 104 | [OPTION_STRING_HOST ] = 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 | |
| 127 | /* really simple implementation, just count the bits */ |
| 128 | static int mton(uint32_t mask) |
| 129 | { |
| 130 | int i = 0; |
| 131 | mask = ntohl(mask); /* 111110000-like bit pattern */ |
| 132 | while (mask) { |
| 133 | i++; |
| 134 | mask <<= 1; |
| 135 | } |
| 136 | return i; |
| 137 | } |
| 138 | |
Denys Vlasenko | 7280d20 | 2011-12-08 16:41:05 +0100 | [diff] [blame] | 139 | /* Check if a given label represents a valid DNS label |
| 140 | * Return pointer to the first character after the label upon success, |
| 141 | * NULL otherwise. |
| 142 | * See RFC1035, 2.3.1 |
| 143 | */ |
| 144 | /* We don't need to be particularly anal. For example, allowing _, hyphen |
| 145 | * at the end, or leading and trailing dots would be ok, since it |
| 146 | * can't be used for attacks. (Leading hyphen can be, if someone uses |
| 147 | * cmd "$hostname" |
| 148 | * in the script: then hostname may be treated as an option) |
| 149 | */ |
| 150 | static const char *valid_domain_label(const char *label) |
| 151 | { |
| 152 | unsigned char ch; |
| 153 | unsigned pos = 0; |
| 154 | |
| 155 | for (;;) { |
| 156 | ch = *label; |
| 157 | if ((ch|0x20) < 'a' || (ch|0x20) > 'z') { |
| 158 | if (pos == 0) { |
| 159 | /* label must begin with letter */ |
| 160 | return NULL; |
| 161 | } |
| 162 | if (ch < '0' || ch > '9') { |
| 163 | if (ch == '\0' || ch == '.') |
| 164 | return label; |
| 165 | /* DNS allows only '-', but we are more permissive */ |
| 166 | if (ch != '-' && ch != '_') |
| 167 | return NULL; |
| 168 | } |
| 169 | } |
| 170 | label++; |
| 171 | pos++; |
| 172 | //Do we want this? |
| 173 | //if (pos > 63) /* NS_MAXLABEL; labels must be 63 chars or less */ |
| 174 | // return NULL; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | /* Check if a given name represents a valid DNS name */ |
| 179 | /* See RFC1035, 2.3.1 */ |
| 180 | static int good_hostname(const char *name) |
| 181 | { |
| 182 | //const char *start = name; |
| 183 | |
| 184 | for (;;) { |
| 185 | name = valid_domain_label(name); |
| 186 | if (!name) |
| 187 | return 0; |
| 188 | if (!name[0]) |
| 189 | return 1; |
| 190 | //Do we want this? |
| 191 | //return ((name - start) < 1025); /* NS_MAXDNAME */ |
| 192 | name++; |
| 193 | } |
| 194 | } |
| 195 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 196 | /* Create "opt_name=opt_value" string */ |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 197 | 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] | 198 | { |
| 199 | unsigned upper_length; |
| 200 | int len, type, optlen; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 201 | char *dest, *ret; |
| 202 | |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 203 | /* option points to OPT_DATA, need to go back to get OPT_LEN */ |
| 204 | len = option[-OPT_DATA + OPT_LEN]; |
Vladislav Grishenko | ad8def2 | 2010-10-17 12:27:50 +0200 | [diff] [blame] | 205 | |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 206 | type = optflag->flags & OPTION_TYPE_MASK; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 207 | optlen = dhcp_option_lengths[type]; |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 208 | upper_length = len_of_option_as_string[type] |
| 209 | * ((unsigned)(len + optlen - 1) / (unsigned)optlen); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 210 | |
| 211 | dest = ret = xmalloc(upper_length + strlen(opt_name) + 2); |
| 212 | dest += sprintf(ret, "%s=", opt_name); |
| 213 | |
| 214 | while (len >= optlen) { |
| 215 | switch (type) { |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 216 | case OPTION_IP: |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 217 | case OPTION_IP_PAIR: |
| 218 | dest += sprint_nip(dest, "", option); |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 219 | if (type == OPTION_IP) |
| 220 | break; |
| 221 | dest += sprint_nip(dest, "/", option + 4); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 222 | break; |
Denys Vlasenko | a8f6b99 | 2010-03-26 08:35:24 +0100 | [diff] [blame] | 223 | // case OPTION_BOOLEAN: |
| 224 | // dest += sprintf(dest, *option ? "yes" : "no"); |
| 225 | // break; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 226 | case OPTION_U8: |
| 227 | dest += sprintf(dest, "%u", *option); |
| 228 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 229 | // case OPTION_S16: |
| 230 | case OPTION_U16: { |
| 231 | uint16_t val_u16; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 232 | move_from_unaligned16(val_u16, option); |
| 233 | dest += sprintf(dest, "%u", ntohs(val_u16)); |
| 234 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 235 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 236 | case OPTION_S32: |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 237 | case OPTION_U32: { |
| 238 | uint32_t val_u32; |
| 239 | move_from_unaligned32(val_u32, option); |
| 240 | 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] | 241 | break; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 242 | } |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 243 | /* Note: options which use 'return' instead of 'break' |
| 244 | * (for example, OPTION_STRING) skip the code which handles |
| 245 | * the case of list of options. |
| 246 | */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 247 | case OPTION_STRING: |
Denys Vlasenko | 7280d20 | 2011-12-08 16:41:05 +0100 | [diff] [blame] | 248 | case OPTION_STRING_HOST: |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 249 | memcpy(dest, option, len); |
| 250 | dest[len] = '\0'; |
Denys Vlasenko | 7280d20 | 2011-12-08 16:41:05 +0100 | [diff] [blame] | 251 | if (type == OPTION_STRING_HOST && !good_hostname(dest)) |
| 252 | safe_strncpy(dest, "bad", len); |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 253 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 254 | case OPTION_STATIC_ROUTES: { |
| 255 | /* Option binary format: |
| 256 | * mask [one byte, 0..32] |
| 257 | * ip [big endian, 0..4 bytes depending on mask] |
| 258 | * router [big endian, 4 bytes] |
| 259 | * may be repeated |
| 260 | * |
| 261 | * We convert it to a string "IP/MASK ROUTER IP2/MASK2 ROUTER2" |
| 262 | */ |
| 263 | const char *pfx = ""; |
| 264 | |
| 265 | while (len >= 1 + 4) { /* mask + 0-byte ip + router */ |
| 266 | uint32_t nip; |
| 267 | uint8_t *p; |
| 268 | unsigned mask; |
| 269 | int bytes; |
| 270 | |
| 271 | mask = *option++; |
| 272 | if (mask > 32) |
| 273 | break; |
| 274 | len--; |
| 275 | |
| 276 | nip = 0; |
| 277 | p = (void*) &nip; |
| 278 | bytes = (mask + 7) / 8; /* 0 -> 0, 1..8 -> 1, 9..16 -> 2 etc */ |
| 279 | while (--bytes >= 0) { |
| 280 | *p++ = *option++; |
| 281 | len--; |
| 282 | } |
| 283 | if (len < 4) |
| 284 | break; |
| 285 | |
| 286 | /* print ip/mask */ |
| 287 | dest += sprint_nip(dest, pfx, (void*) &nip); |
| 288 | pfx = " "; |
| 289 | dest += sprintf(dest, "/%u ", mask); |
| 290 | /* print router */ |
| 291 | dest += sprint_nip(dest, "", option); |
| 292 | option += 4; |
| 293 | len -= 4; |
| 294 | } |
| 295 | |
| 296 | return ret; |
| 297 | } |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 298 | case OPTION_6RD: |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 299 | /* Option binary format (see RFC 5969): |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 300 | * 0 1 2 3 |
| 301 | * 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] | 302 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
| 303 | * | OPTION_6RD | option-length | IPv4MaskLen | 6rdPrefixLen | |
| 304 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 305 | * | 6rdPrefix | |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 306 | * ... (16 octets) ... |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 307 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 308 | * ... 6rdBRIPv4Address(es) ... |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 309 | * +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 310 | * We convert it to a string |
| 311 | * "IPv4MaskLen 6rdPrefixLen 6rdPrefix 6rdBRIPv4Address..." |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 312 | * |
| 313 | * Sanity check: ensure that our length is at least 22 bytes, that |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 314 | * IPv4MaskLen <= 32, |
| 315 | * 6rdPrefixLen <= 128, |
| 316 | * 6rdPrefixLen + (32 - IPv4MaskLen) <= 128 |
| 317 | * (2nd condition need no check - it follows from 1st and 3rd). |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 318 | * Else, return envvar with empty value ("optname=") |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 319 | */ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 320 | if (len >= (1 + 1 + 16 + 4) |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 321 | && option[0] <= 32 |
| 322 | && (option[1] + 32 - option[0]) <= 128 |
| 323 | ) { |
| 324 | /* IPv4MaskLen */ |
| 325 | dest += sprintf(dest, "%u ", *option++); |
| 326 | /* 6rdPrefixLen */ |
| 327 | dest += sprintf(dest, "%u ", *option++); |
| 328 | /* 6rdPrefix */ |
Denys Vlasenko | 42816c2 | 2011-10-20 10:52:07 +0200 | [diff] [blame] | 329 | dest += sprint_nip6(dest, /* "", */ option); |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 330 | option += 16; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 331 | len -= 1 + 1 + 16 + 4; |
| 332 | /* "+ 4" above corresponds to the length of IPv4 addr |
| 333 | * we consume in the loop below */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 334 | while (1) { |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 335 | /* 6rdBRIPv4Address(es) */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 336 | dest += sprint_nip(dest, " ", option); |
| 337 | option += 4; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 338 | len -= 4; /* do we have yet another 4+ bytes? */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 339 | if (len < 0) |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 340 | break; /* no */ |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 341 | } |
| 342 | } |
| 343 | |
| 344 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 345 | #if ENABLE_FEATURE_UDHCP_RFC3397 |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 346 | case OPTION_DNS_STRING: |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 347 | /* unpack option into dest; use ret for prefix (i.e., "optname=") */ |
| 348 | dest = dname_dec(option, len, ret); |
| 349 | if (dest) { |
| 350 | free(ret); |
| 351 | return dest; |
| 352 | } |
| 353 | /* error. return "optname=" string */ |
| 354 | return ret; |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 355 | case OPTION_SIP_SERVERS: |
| 356 | /* Option binary format: |
| 357 | * type: byte |
| 358 | * type=0: domain names, dns-compressed |
| 359 | * type=1: IP addrs |
| 360 | */ |
| 361 | option++; |
| 362 | len--; |
| 363 | if (option[-1] == 0) { |
| 364 | dest = dname_dec(option, len, ret); |
| 365 | if (dest) { |
| 366 | free(ret); |
| 367 | return dest; |
| 368 | } |
| 369 | } else |
| 370 | if (option[-1] == 1) { |
| 371 | const char *pfx = ""; |
| 372 | while (1) { |
| 373 | len -= 4; |
| 374 | if (len < 0) |
| 375 | break; |
| 376 | dest += sprint_nip(dest, pfx, option); |
| 377 | pfx = " "; |
| 378 | option += 4; |
| 379 | } |
| 380 | } |
| 381 | return ret; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 382 | #endif |
Denys Vlasenko | 243ddcb | 2010-04-03 17:34:52 +0200 | [diff] [blame] | 383 | } /* switch */ |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 384 | |
| 385 | /* If we are here, try to format any remaining data |
| 386 | * in the option as another, similarly-formatted option |
| 387 | */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 388 | option += optlen; |
| 389 | len -= optlen; |
Vladislav Grishenko | ad8def2 | 2010-10-17 12:27:50 +0200 | [diff] [blame] | 390 | // TODO: it can be a list only if (optflag->flags & OPTION_LIST). |
| 391 | // Should we bail out/warn if we see multi-ip option which is |
| 392 | // not allowed to be such (for example, DHCP_BROADCAST)? - |
Denys Vlasenko | cd4d78f | 2011-10-20 13:21:55 +0200 | [diff] [blame] | 393 | if (len < optlen /* || !(optflag->flags & OPTION_LIST) */) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 394 | break; |
| 395 | *dest++ = ' '; |
| 396 | *dest = '\0'; |
Denys Vlasenko | 1dff672 | 2011-10-20 12:29:18 +0200 | [diff] [blame] | 397 | } /* while */ |
| 398 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 399 | return ret; |
| 400 | } |
| 401 | |
| 402 | /* put all the parameters into the environment */ |
| 403 | static char **fill_envp(struct dhcp_packet *packet) |
| 404 | { |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 405 | int envc; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 406 | int i; |
| 407 | char **envp, **curr; |
| 408 | const char *opt_name; |
| 409 | uint8_t *temp; |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 410 | uint8_t overload = 0; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 411 | |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 412 | #define BITMAP unsigned |
| 413 | #define BBITS (sizeof(BITMAP) * 8) |
| 414 | #define BMASK(i) (1 << (i & (sizeof(BITMAP) * 8 - 1))) |
| 415 | #define FOUND_OPTS(i) (found_opts[(unsigned)i / BBITS]) |
| 416 | BITMAP found_opts[256 / BBITS]; |
| 417 | |
| 418 | memset(found_opts, 0, sizeof(found_opts)); |
| 419 | |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 420 | /* We need 6 elements for: |
| 421 | * "interface=IFACE" |
| 422 | * "ip=N.N.N.N" from packet->yiaddr |
| 423 | * "siaddr=IP" from packet->siaddr_nip (unless 0) |
| 424 | * "boot_file=FILE" from packet->file (unless overloaded) |
| 425 | * "sname=SERVER_HOSTNAME" from packet->sname (unless overloaded) |
| 426 | * terminating NULL |
| 427 | */ |
| 428 | envc = 6; |
| 429 | /* +1 element for each option, +2 for subnet option: */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 430 | if (packet) { |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 431 | /* note: do not search for "pad" (0) and "end" (255) options */ |
Denys Vlasenko | 7280d20 | 2011-12-08 16:41:05 +0100 | [diff] [blame] | 432 | //TODO: change logic to scan packet _once_ |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 433 | for (i = 1; i < 255; i++) { |
| 434 | temp = udhcp_get_option(packet, i); |
| 435 | if (temp) { |
| 436 | if (i == DHCP_OPTION_OVERLOAD) |
| 437 | overload = *temp; |
| 438 | else if (i == DHCP_SUBNET) |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 439 | envc++; /* for $mask */ |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 440 | envc++; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 441 | /*if (i != DHCP_MESSAGE_TYPE)*/ |
| 442 | FOUND_OPTS(i) |= BMASK(i); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 443 | } |
| 444 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 445 | } |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 446 | curr = envp = xzalloc(sizeof(envp[0]) * envc); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 447 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 448 | *curr = xasprintf("interface=%s", client_config.interface); |
| 449 | putenv(*curr++); |
| 450 | |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 451 | if (!packet) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 452 | return envp; |
| 453 | |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 454 | /* Export BOOTP fields. Fields we don't (yet?) export: |
| 455 | * uint8_t op; // always BOOTREPLY |
| 456 | * uint8_t htype; // hardware address type. 1 = 10mb ethernet |
| 457 | * uint8_t hlen; // hardware address length |
| 458 | * uint8_t hops; // used by relay agents only |
| 459 | * uint32_t xid; |
| 460 | * uint16_t secs; // elapsed since client began acquisition/renewal |
| 461 | * uint16_t flags; // only one flag so far: bcast. Never set by server |
| 462 | * uint32_t ciaddr; // client IP (usually == yiaddr. can it be different |
| 463 | * // if during renew server wants to give us differn IP?) |
| 464 | * uint32_t gateway_nip; // relay agent IP address |
| 465 | * uint8_t chaddr[16]; // link-layer client hardware address (MAC) |
| 466 | * TODO: export gateway_nip as $giaddr? |
| 467 | */ |
| 468 | /* Most important one: yiaddr as $ip */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 469 | *curr = xmalloc(sizeof("ip=255.255.255.255")); |
| 470 | sprint_nip(*curr, "ip=", (uint8_t *) &packet->yiaddr); |
| 471 | putenv(*curr++); |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 472 | if (packet->siaddr_nip) { |
| 473 | /* IP address of next server to use in bootstrap */ |
| 474 | *curr = xmalloc(sizeof("siaddr=255.255.255.255")); |
| 475 | sprint_nip(*curr, "siaddr=", (uint8_t *) &packet->siaddr_nip); |
| 476 | putenv(*curr++); |
| 477 | } |
| 478 | if (!(overload & FILE_FIELD) && packet->file[0]) { |
| 479 | /* watch out for invalid packets */ |
| 480 | *curr = xasprintf("boot_file=%."DHCP_PKT_FILE_LEN_STR"s", packet->file); |
| 481 | putenv(*curr++); |
| 482 | } |
| 483 | if (!(overload & SNAME_FIELD) && packet->sname[0]) { |
| 484 | /* watch out for invalid packets */ |
| 485 | *curr = xasprintf("sname=%."DHCP_PKT_SNAME_LEN_STR"s", packet->sname); |
| 486 | putenv(*curr++); |
| 487 | } |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 488 | |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 489 | /* Export known DHCP options */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 490 | opt_name = dhcp_option_strings; |
| 491 | i = 0; |
| 492 | while (*opt_name) { |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 493 | uint8_t code = dhcp_optflags[i].code; |
| 494 | BITMAP *found_ptr = &FOUND_OPTS(code); |
| 495 | BITMAP found_mask = BMASK(code); |
| 496 | if (!(*found_ptr & found_mask)) |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 497 | goto next; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 498 | *found_ptr &= ~found_mask; /* leave only unknown options */ |
| 499 | temp = udhcp_get_option(packet, code); |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 500 | *curr = xmalloc_optname_optval(temp, &dhcp_optflags[i], opt_name); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 501 | putenv(*curr++); |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 502 | if (code == DHCP_SUBNET) { |
Denys Vlasenko | b7d19cc | 2010-05-30 23:41:23 +0200 | [diff] [blame] | 503 | /* Subnet option: make things like "$ip/$mask" possible */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 504 | uint32_t subnet; |
| 505 | move_from_unaligned32(subnet, temp); |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 506 | *curr = xasprintf("mask=%u", mton(subnet)); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 507 | putenv(*curr++); |
| 508 | } |
| 509 | next: |
| 510 | opt_name += strlen(opt_name) + 1; |
| 511 | i++; |
| 512 | } |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 513 | /* Export unknown options */ |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 514 | for (i = 0; i < 256;) { |
| 515 | BITMAP bitmap = FOUND_OPTS(i); |
| 516 | if (!bitmap) { |
| 517 | i += BBITS; |
| 518 | continue; |
| 519 | } |
| 520 | if (bitmap & BMASK(i)) { |
| 521 | unsigned len, ofs; |
| 522 | |
| 523 | temp = udhcp_get_option(packet, i); |
| 524 | /* udhcp_get_option returns ptr to data portion, |
| 525 | * need to go back to get len |
| 526 | */ |
| 527 | len = temp[-OPT_DATA + OPT_LEN]; |
| 528 | *curr = xmalloc(sizeof("optNNN=") + 1 + len*2); |
| 529 | ofs = sprintf(*curr, "opt%u=", i); |
Denys Vlasenko | 1f56e51 | 2011-10-19 22:40:35 +0200 | [diff] [blame] | 530 | *bin2hex(*curr + ofs, (void*) temp, len) = '\0'; |
Nigel Hathaway | c37d4c6 | 2011-04-26 02:38:29 +0200 | [diff] [blame] | 531 | putenv(*curr++); |
| 532 | } |
| 533 | i++; |
| 534 | } |
Denys Vlasenko | fbca0c6 | 2011-10-20 14:24:18 +0200 | [diff] [blame] | 535 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 536 | return envp; |
| 537 | } |
| 538 | |
| 539 | /* Call a script with a par file and env vars */ |
| 540 | static void udhcp_run_script(struct dhcp_packet *packet, const char *name) |
| 541 | { |
| 542 | char **envp, **curr; |
| 543 | char *argv[3]; |
| 544 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 545 | envp = fill_envp(packet); |
| 546 | |
| 547 | /* call script */ |
| 548 | log1("Executing %s %s", client_config.script, name); |
| 549 | argv[0] = (char*) client_config.script; |
| 550 | argv[1] = (char*) name; |
| 551 | argv[2] = NULL; |
| 552 | spawn_and_wait(argv); |
| 553 | |
| 554 | for (curr = envp; *curr; curr++) { |
| 555 | log2(" %s", *curr); |
Denys Vlasenko | dd8adde | 2010-06-24 05:00:50 +0200 | [diff] [blame] | 556 | bb_unsetenv_and_free(*curr); |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 557 | } |
| 558 | free(envp); |
| 559 | } |
| 560 | |
| 561 | |
| 562 | /*** Sending/receiving packets ***/ |
| 563 | |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 564 | static ALWAYS_INLINE uint32_t random_xid(void) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 565 | { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 566 | return rand(); |
| 567 | } |
| 568 | |
| 569 | /* Initialize the packet with the proper defaults */ |
| 570 | static void init_packet(struct dhcp_packet *packet, char type) |
| 571 | { |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 572 | uint16_t secs; |
| 573 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 574 | /* Fill in: op, htype, hlen, cookie fields; message type option: */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 575 | udhcp_init_header(packet, type); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 576 | |
| 577 | packet->xid = random_xid(); |
| 578 | |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 579 | client_config.last_secs = monotonic_sec(); |
| 580 | if (client_config.first_secs == 0) |
| 581 | client_config.first_secs = client_config.last_secs; |
| 582 | secs = client_config.last_secs - client_config.first_secs; |
| 583 | packet->secs = htons(secs); |
| 584 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 585 | memcpy(packet->chaddr, client_config.client_mac, 6); |
| 586 | if (client_config.clientid) |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 587 | udhcp_add_binary_option(packet, client_config.clientid); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 588 | } |
| 589 | |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 590 | static void add_client_options(struct dhcp_packet *packet) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 591 | { |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 592 | uint8_t c; |
| 593 | int i, end, len; |
| 594 | |
| 595 | 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] | 596 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 597 | /* 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] | 598 | * 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] | 599 | * No bounds checking because it goes towards the head of the packet. */ |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 600 | end = udhcp_end_option(packet->options); |
| 601 | len = 0; |
Denys Vlasenko | c03602b | 2010-04-04 15:28:49 +0200 | [diff] [blame] | 602 | for (i = 0; (c = dhcp_optflags[i].code) != 0; i++) { |
| 603 | if (( (dhcp_optflags[i].flags & OPTION_REQ) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 604 | && !client_config.no_default_options |
| 605 | ) |
| 606 | || (client_config.opt_mask[c >> 3] & (1 << (c & 7))) |
| 607 | ) { |
| 608 | packet->options[end + OPT_DATA + len] = c; |
| 609 | len++; |
| 610 | } |
| 611 | } |
| 612 | if (len) { |
| 613 | packet->options[end + OPT_CODE] = DHCP_PARAM_REQ; |
| 614 | packet->options[end + OPT_LEN] = len; |
| 615 | packet->options[end + OPT_DATA + len] = DHCP_END; |
| 616 | } |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 617 | |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 618 | if (client_config.vendorclass) |
| 619 | udhcp_add_binary_option(packet, client_config.vendorclass); |
| 620 | if (client_config.hostname) |
| 621 | udhcp_add_binary_option(packet, client_config.hostname); |
| 622 | if (client_config.fqdn) |
| 623 | udhcp_add_binary_option(packet, client_config.fqdn); |
| 624 | |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 625 | /* Request broadcast replies if we have no IP addr */ |
| 626 | if ((option_mask32 & OPT_B) && packet->ciaddr == 0) |
| 627 | packet->flags |= htons(BROADCAST_FLAG); |
| 628 | |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 629 | /* Add -x options if any */ |
| 630 | { |
| 631 | struct option_set *curr = client_config.options; |
| 632 | while (curr) { |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 633 | udhcp_add_binary_option(packet, curr->data); |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 634 | curr = curr->next; |
| 635 | } |
| 636 | // if (client_config.sname) |
| 637 | // strncpy((char*)packet->sname, client_config.sname, sizeof(packet->sname) - 1); |
| 638 | // if (client_config.boot_file) |
| 639 | // strncpy((char*)packet->file, client_config.boot_file, sizeof(packet->file) - 1); |
| 640 | } |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [diff] [blame] | 641 | |
| 642 | // This will be needed if we remove -V VENDOR_STR in favor of |
| 643 | // -x vendor:VENDOR_STR |
| 644 | //if (!udhcp_find_option(packet.options, DHCP_VENDOR)) |
| 645 | // /* not set, set the default vendor ID */ |
| 646 | // ...add (DHCP_VENDOR, "udhcp "BB_VER) opt... |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 647 | } |
| 648 | |
| 649 | /* RFC 2131 |
| 650 | * 4.4.4 Use of broadcast and unicast |
| 651 | * |
| 652 | * The DHCP client broadcasts DHCPDISCOVER, DHCPREQUEST and DHCPINFORM |
| 653 | * messages, unless the client knows the address of a DHCP server. |
| 654 | * The client unicasts DHCPRELEASE messages to the server. Because |
| 655 | * the client is declining the use of the IP address supplied by the server, |
| 656 | * the client broadcasts DHCPDECLINE messages. |
| 657 | * |
| 658 | * When the DHCP client knows the address of a DHCP server, in either |
| 659 | * INIT or REBOOTING state, the client may use that address |
| 660 | * in the DHCPDISCOVER or DHCPREQUEST rather than the IP broadcast address. |
| 661 | * The client may also use unicast to send DHCPINFORM messages |
| 662 | * to a known DHCP server. If the client receives no response to DHCP |
| 663 | * messages sent to the IP address of a known DHCP server, the DHCP |
| 664 | * client reverts to using the IP broadcast address. |
| 665 | */ |
| 666 | |
| 667 | static int raw_bcast_from_client_config_ifindex(struct dhcp_packet *packet) |
| 668 | { |
| 669 | return udhcp_send_raw_packet(packet, |
| 670 | /*src*/ INADDR_ANY, CLIENT_PORT, |
| 671 | /*dst*/ INADDR_BROADCAST, SERVER_PORT, MAC_BCAST_ADDR, |
| 672 | client_config.ifindex); |
| 673 | } |
| 674 | |
| 675 | /* 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] | 676 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 677 | static NOINLINE int send_discover(uint32_t xid, uint32_t requested) |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 678 | { |
| 679 | struct dhcp_packet packet; |
| 680 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 681 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 682 | * random xid field (we override it below), |
| 683 | * client-id option (unless -C), message type option: |
| 684 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 685 | init_packet(&packet, DHCPDISCOVER); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 686 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 687 | packet.xid = xid; |
| 688 | if (requested) |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 689 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 690 | |
| 691 | /* Add options: maxsize, |
| 692 | * optionally: hostname, fqdn, vendorclass, |
| 693 | * "param req" option according to -O, options specified with -x |
| 694 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 695 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 696 | |
| 697 | bb_info_msg("Sending discover..."); |
| 698 | return raw_bcast_from_client_config_ifindex(&packet); |
| 699 | } |
| 700 | |
| 701 | /* Broadcast a DHCP request message */ |
| 702 | /* RFC 2131 3.1 paragraph 3: |
| 703 | * "The client _broadcasts_ a DHCPREQUEST message..." |
| 704 | */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 705 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 706 | 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] | 707 | { |
| 708 | struct dhcp_packet packet; |
| 709 | struct in_addr addr; |
| 710 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 711 | /* |
| 712 | * RFC 2131 4.3.2 DHCPREQUEST message |
| 713 | * ... |
| 714 | * If the DHCPREQUEST message contains a 'server identifier' |
| 715 | * option, the message is in response to a DHCPOFFER message. |
| 716 | * Otherwise, the message is a request to verify or extend an |
| 717 | * existing lease. If the client uses a 'client identifier' |
| 718 | * in a DHCPREQUEST message, it MUST use that same 'client identifier' |
| 719 | * in all subsequent messages. If the client included a list |
| 720 | * of requested parameters in a DHCPDISCOVER message, it MUST |
| 721 | * include that list in all subsequent messages. |
| 722 | */ |
| 723 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 724 | * random xid field (we override it below), |
| 725 | * client-id option (unless -C), message type option: |
| 726 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 727 | init_packet(&packet, DHCPREQUEST); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 728 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 729 | packet.xid = xid; |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 730 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 731 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 732 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 733 | |
| 734 | /* Add options: maxsize, |
| 735 | * optionally: hostname, fqdn, vendorclass, |
| 736 | * "param req" option according to -O, and options specified with -x |
| 737 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 738 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 739 | |
| 740 | addr.s_addr = requested; |
| 741 | bb_info_msg("Sending select for %s...", inet_ntoa(addr)); |
| 742 | return raw_bcast_from_client_config_ifindex(&packet); |
| 743 | } |
| 744 | |
| 745 | /* Unicast or broadcast a DHCP renew message */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 746 | /* NOINLINE: limit stack usage in caller */ |
| 747 | 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] | 748 | { |
| 749 | struct dhcp_packet packet; |
| 750 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 751 | /* |
| 752 | * RFC 2131 4.3.2 DHCPREQUEST message |
| 753 | * ... |
| 754 | * DHCPREQUEST generated during RENEWING state: |
| 755 | * |
| 756 | * 'server identifier' MUST NOT be filled in, 'requested IP address' |
| 757 | * option MUST NOT be filled in, 'ciaddr' MUST be filled in with |
| 758 | * client's IP address. In this situation, the client is completely |
| 759 | * configured, and is trying to extend its lease. This message will |
| 760 | * be unicast, so no relay agents will be involved in its |
| 761 | * transmission. Because 'giaddr' is therefore not filled in, the |
| 762 | * DHCP server will trust the value in 'ciaddr', and use it when |
| 763 | * replying to the client. |
| 764 | */ |
| 765 | /* Fill in: op, htype, hlen, cookie, chaddr fields, |
| 766 | * random xid field (we override it below), |
| 767 | * client-id option (unless -C), message type option: |
| 768 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 769 | init_packet(&packet, DHCPREQUEST); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 770 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 771 | packet.xid = xid; |
| 772 | packet.ciaddr = ciaddr; |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 773 | |
| 774 | /* Add options: maxsize, |
| 775 | * optionally: hostname, fqdn, vendorclass, |
| 776 | * "param req" option according to -O, and options specified with -x |
| 777 | */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 778 | add_client_options(&packet); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 779 | |
| 780 | bb_info_msg("Sending renew..."); |
| 781 | if (server) |
| 782 | return udhcp_send_kernel_packet(&packet, |
| 783 | ciaddr, CLIENT_PORT, |
| 784 | server, SERVER_PORT); |
| 785 | return raw_bcast_from_client_config_ifindex(&packet); |
| 786 | } |
| 787 | |
| 788 | #if ENABLE_FEATURE_UDHCPC_ARPING |
| 789 | /* Broadcast a DHCP decline message */ |
Denys Vlasenko | 0bb35e1 | 2010-10-21 12:33:10 +0200 | [diff] [blame] | 790 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 791 | 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] | 792 | { |
| 793 | struct dhcp_packet packet; |
| 794 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 795 | /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields, |
| 796 | * client-id option (unless -C), message type option: |
| 797 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 798 | init_packet(&packet, DHCPDECLINE); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 799 | |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 800 | #if 0 |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 801 | /* RFC 2131 says DHCPDECLINE's xid is randomly selected by client, |
| 802 | * but in case the server is buggy and wants DHCPDECLINE's xid |
| 803 | * to match the xid which started entire handshake, |
| 804 | * we use the same xid we used in initial DHCPDISCOVER: |
| 805 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 806 | packet.xid = xid; |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 807 | #endif |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 808 | /* DHCPDECLINE uses "requested ip", not ciaddr, to store offered IP */ |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 809 | udhcp_add_simple_option(&packet, DHCP_REQUESTED_IP, requested); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 810 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 811 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 812 | |
| 813 | bb_info_msg("Sending decline..."); |
| 814 | return raw_bcast_from_client_config_ifindex(&packet); |
| 815 | } |
| 816 | #endif |
| 817 | |
| 818 | /* Unicast a DHCP release message */ |
| 819 | static int send_release(uint32_t server, uint32_t ciaddr) |
| 820 | { |
| 821 | struct dhcp_packet packet; |
| 822 | |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 823 | /* Fill in: op, htype, hlen, cookie, chaddr, random xid fields, |
| 824 | * client-id option (unless -C), message type option: |
| 825 | */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 826 | init_packet(&packet, DHCPRELEASE); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 827 | |
| 828 | /* DHCPRELEASE uses ciaddr, not "requested ip", to store IP being released */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 829 | packet.ciaddr = ciaddr; |
| 830 | |
Denys Vlasenko | 7724c76 | 2010-03-26 09:32:09 +0100 | [diff] [blame] | 831 | udhcp_add_simple_option(&packet, DHCP_SERVER_ID, server); |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 832 | |
| 833 | bb_info_msg("Sending release..."); |
| 834 | return udhcp_send_kernel_packet(&packet, ciaddr, CLIENT_PORT, server, SERVER_PORT); |
| 835 | } |
| 836 | |
| 837 | /* 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] | 838 | /* NOINLINE: limit stack usage in caller */ |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 839 | static NOINLINE int udhcp_recv_raw_packet(struct dhcp_packet *dhcp_pkt, int fd) |
| 840 | { |
| 841 | int bytes; |
| 842 | struct ip_udp_dhcp_packet packet; |
| 843 | uint16_t check; |
| 844 | |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 845 | bytes = safe_read(fd, &packet, sizeof(packet)); |
| 846 | if (bytes < 0) { |
| 847 | log1("Packet read error, ignoring"); |
| 848 | /* NB: possible down interface, etc. Caller should pause. */ |
| 849 | return bytes; /* returns -1 */ |
| 850 | } |
| 851 | |
| 852 | if (bytes < (int) (sizeof(packet.ip) + sizeof(packet.udp))) { |
| 853 | log1("Packet is too short, ignoring"); |
| 854 | return -2; |
| 855 | } |
| 856 | |
| 857 | if (bytes < ntohs(packet.ip.tot_len)) { |
| 858 | /* packet is bigger than sizeof(packet), we did partial read */ |
| 859 | log1("Oversized packet, ignoring"); |
| 860 | return -2; |
| 861 | } |
| 862 | |
| 863 | /* ignore any extra garbage bytes */ |
| 864 | bytes = ntohs(packet.ip.tot_len); |
| 865 | |
| 866 | /* 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] | 867 | if (packet.ip.protocol != IPPROTO_UDP |
| 868 | || packet.ip.version != IPVERSION |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 869 | || packet.ip.ihl != (sizeof(packet.ip) >> 2) |
| 870 | || packet.udp.dest != htons(CLIENT_PORT) |
| 871 | /* || bytes > (int) sizeof(packet) - can't happen */ |
| 872 | || ntohs(packet.udp.len) != (uint16_t)(bytes - sizeof(packet.ip)) |
| 873 | ) { |
| 874 | log1("Unrelated/bogus packet, ignoring"); |
| 875 | return -2; |
| 876 | } |
| 877 | |
| 878 | /* verify IP checksum */ |
| 879 | check = packet.ip.check; |
| 880 | packet.ip.check = 0; |
Baruch Siach | e8f3633 | 2011-09-07 17:52:37 +0200 | [diff] [blame] | 881 | if (check != inet_cksum((uint16_t *)&packet.ip, sizeof(packet.ip))) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 882 | log1("Bad IP header checksum, ignoring"); |
| 883 | return -2; |
| 884 | } |
| 885 | |
| 886 | /* verify UDP checksum. IP header has to be modified for this */ |
| 887 | memset(&packet.ip, 0, offsetof(struct iphdr, protocol)); |
| 888 | /* ip.xx fields which are not memset: protocol, check, saddr, daddr */ |
| 889 | packet.ip.tot_len = packet.udp.len; /* yes, this is needed */ |
| 890 | check = packet.udp.check; |
| 891 | packet.udp.check = 0; |
Baruch Siach | e8f3633 | 2011-09-07 17:52:37 +0200 | [diff] [blame] | 892 | if (check && check != inet_cksum((uint16_t *)&packet, bytes)) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 893 | log1("Packet with bad UDP checksum received, ignoring"); |
| 894 | return -2; |
| 895 | } |
| 896 | |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 897 | if (packet.data.cookie != htonl(DHCP_MAGIC)) { |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 898 | bb_info_msg("Packet with bad magic, ignoring"); |
| 899 | return -2; |
| 900 | } |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 901 | |
Denys Vlasenko | d38ca03 | 2011-11-05 01:25:03 +0100 | [diff] [blame] | 902 | log1("Received a packet"); |
Denys Vlasenko | 7981d79 | 2011-10-20 10:34:05 +0200 | [diff] [blame] | 903 | udhcp_dump_packet(&packet.data); |
| 904 | |
| 905 | bytes -= sizeof(packet.ip) + sizeof(packet.udp); |
| 906 | memcpy(dhcp_pkt, &packet.data, bytes); |
| 907 | return bytes; |
Denys Vlasenko | 501e35c | 2010-03-22 13:43:12 +0100 | [diff] [blame] | 908 | } |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 909 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 910 | |
| 911 | /*** Main ***/ |
| 912 | |
| 913 | static int sockfd = -1; |
| 914 | |
| 915 | #define LISTEN_NONE 0 |
| 916 | #define LISTEN_KERNEL 1 |
| 917 | #define LISTEN_RAW 2 |
| 918 | static smallint listen_mode; |
| 919 | |
| 920 | /* initial state: (re)start DHCP negotiation */ |
| 921 | #define INIT_SELECTING 0 |
| 922 | /* discover was sent, DHCPOFFER reply received */ |
| 923 | #define REQUESTING 1 |
| 924 | /* select/renew was sent, DHCPACK reply received */ |
| 925 | #define BOUND 2 |
| 926 | /* half of lease passed, want to renew it by sending unicast renew requests */ |
| 927 | #define RENEWING 3 |
| 928 | /* renew requests were not answered, lease is almost over, send broadcast renew */ |
| 929 | #define REBINDING 4 |
| 930 | /* manually requested renew (SIGUSR1) */ |
| 931 | #define RENEW_REQUESTED 5 |
| 932 | /* release, possibly manually requested (SIGUSR2) */ |
| 933 | #define RELEASED 6 |
| 934 | static smallint state; |
| 935 | |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 936 | static int udhcp_raw_socket(int ifindex) |
| 937 | { |
| 938 | int fd; |
| 939 | struct sockaddr_ll sock; |
| 940 | |
| 941 | /* |
| 942 | * Comment: |
| 943 | * |
| 944 | * I've selected not to see LL header, so BPF doesn't see it, too. |
| 945 | * The filter may also pass non-IP and non-ARP packets, but we do |
| 946 | * a more complete check when receiving the message in userspace. |
| 947 | * |
| 948 | * and filter shamelessly stolen from: |
| 949 | * |
| 950 | * http://www.flamewarmaster.de/software/dhcpclient/ |
| 951 | * |
| 952 | * There are a few other interesting ideas on that page (look under |
| 953 | * "Motivation"). Use of netlink events is most interesting. Think |
| 954 | * of various network servers listening for events and reconfiguring. |
| 955 | * That would obsolete sending HUP signals and/or make use of restarts. |
| 956 | * |
| 957 | * Copyright: 2006, 2007 Stefan Rompf <sux@loplof.de>. |
| 958 | * License: GPL v2. |
| 959 | * |
| 960 | * TODO: make conditional? |
| 961 | */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 962 | static const struct sock_filter filter_instr[] = { |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 963 | /* load 9th byte (protocol) */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 964 | BPF_STMT(BPF_LD|BPF_B|BPF_ABS, 9), |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 965 | /* jump to L1 if it is IPPROTO_UDP, else to L4 */ |
| 966 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, IPPROTO_UDP, 0, 6), |
| 967 | /* L1: load halfword from offset 6 (flags and frag offset) */ |
| 968 | BPF_STMT(BPF_LD|BPF_H|BPF_ABS, 6), |
| 969 | /* jump to L4 if any bits in frag offset field are set, else to L2 */ |
| 970 | BPF_JUMP(BPF_JMP|BPF_JSET|BPF_K, 0x1fff, 4, 0), |
| 971 | /* L2: skip IP header (load index reg with header len) */ |
| 972 | BPF_STMT(BPF_LDX|BPF_B|BPF_MSH, 0), |
| 973 | /* load udp destination port from halfword[header_len + 2] */ |
| 974 | BPF_STMT(BPF_LD|BPF_H|BPF_IND, 2), |
| 975 | /* jump to L3 if udp dport is CLIENT_PORT, else to L4 */ |
| 976 | BPF_JUMP(BPF_JMP|BPF_JEQ|BPF_K, 68, 0, 1), |
| 977 | /* L3: accept packet */ |
| 978 | BPF_STMT(BPF_RET|BPF_K, 0xffffffff), |
| 979 | /* L4: discard packet */ |
| 980 | BPF_STMT(BPF_RET|BPF_K, 0), |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 981 | }; |
| 982 | static const struct sock_fprog filter_prog = { |
| 983 | .len = sizeof(filter_instr) / sizeof(filter_instr[0]), |
| 984 | /* casting const away: */ |
| 985 | .filter = (struct sock_filter *) filter_instr, |
| 986 | }; |
| 987 | |
| 988 | log1("Opening raw socket on ifindex %d", ifindex); //log2? |
| 989 | |
| 990 | fd = xsocket(PF_PACKET, SOCK_DGRAM, htons(ETH_P_IP)); |
| 991 | log1("Got raw socket fd %d", fd); //log2? |
| 992 | |
Vladislav Grishenko | 713e6d7 | 2011-02-14 04:50:30 +0100 | [diff] [blame] | 993 | sock.sll_family = AF_PACKET; |
| 994 | sock.sll_protocol = htons(ETH_P_IP); |
| 995 | sock.sll_ifindex = ifindex; |
| 996 | xbind(fd, (struct sockaddr *) &sock, sizeof(sock)); |
| 997 | |
| 998 | if (CLIENT_PORT == 68) { |
| 999 | /* Use only if standard port is in use */ |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 1000 | /* Ignoring error (kernel may lack support for this) */ |
| 1001 | if (setsockopt(fd, SOL_SOCKET, SO_ATTACH_FILTER, &filter_prog, |
| 1002 | sizeof(filter_prog)) >= 0) |
| 1003 | log1("Attached filter to raw socket fd %d", fd); // log? |
| 1004 | } |
| 1005 | |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 1006 | log1("Created raw socket"); |
| 1007 | |
| 1008 | return fd; |
| 1009 | } |
| 1010 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1011 | static void change_listen_mode(int new_mode) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1012 | { |
Denys Vlasenko | 4945ed3 | 2009-06-17 11:58:11 +0200 | [diff] [blame] | 1013 | log1("Entering listen mode: %s", |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1014 | new_mode != LISTEN_NONE |
| 1015 | ? (new_mode == LISTEN_KERNEL ? "kernel" : "raw") |
| 1016 | : "none" |
| 1017 | ); |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 1018 | |
| 1019 | listen_mode = new_mode; |
Denis Vlasenko | fbd2918 | 2007-04-07 01:05:47 +0000 | [diff] [blame] | 1020 | if (sockfd >= 0) { |
| 1021 | close(sockfd); |
| 1022 | sockfd = -1; |
| 1023 | } |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 1024 | if (new_mode == LISTEN_KERNEL) |
| 1025 | sockfd = udhcp_listen_socket(/*INADDR_ANY,*/ CLIENT_PORT, client_config.interface); |
| 1026 | else if (new_mode != LISTEN_NONE) |
| 1027 | sockfd = udhcp_raw_socket(client_config.ifindex); |
Denys Vlasenko | 6b24d53 | 2010-03-22 13:42:13 +0100 | [diff] [blame] | 1028 | /* else LISTEN_NONE: sockfd stays closed */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1029 | } |
| 1030 | |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1031 | /* Called only on SIGUSR1 */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1032 | static void perform_renew(void) |
| 1033 | { |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 1034 | bb_info_msg("Performing a DHCP renew"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1035 | switch (state) { |
| 1036 | case BOUND: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1037 | change_listen_mode(LISTEN_KERNEL); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1038 | case RENEWING: |
| 1039 | case REBINDING: |
| 1040 | state = RENEW_REQUESTED; |
| 1041 | break; |
| 1042 | case RENEW_REQUESTED: /* impatient are we? fine, square 1 */ |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 1043 | udhcp_run_script(NULL, "deconfig"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1044 | case REQUESTING: |
| 1045 | case RELEASED: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1046 | change_listen_mode(LISTEN_RAW); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1047 | state = INIT_SELECTING; |
| 1048 | break; |
| 1049 | case INIT_SELECTING: |
| 1050 | break; |
| 1051 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1052 | } |
| 1053 | |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1054 | static void perform_release(uint32_t server_addr, uint32_t requested_ip) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1055 | { |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 1056 | char buffer[sizeof("255.255.255.255")]; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1057 | struct in_addr temp_addr; |
| 1058 | |
| 1059 | /* send release packet */ |
| 1060 | if (state == BOUND || state == RENEWING || state == REBINDING) { |
| 1061 | temp_addr.s_addr = server_addr; |
Denis Vlasenko | 42b3dea | 2007-07-03 15:47:50 +0000 | [diff] [blame] | 1062 | strcpy(buffer, inet_ntoa(temp_addr)); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1063 | temp_addr.s_addr = requested_ip; |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 1064 | bb_info_msg("Unicasting a release of %s to %s", |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1065 | inet_ntoa(temp_addr), buffer); |
| 1066 | send_release(server_addr, requested_ip); /* unicast */ |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 1067 | udhcp_run_script(NULL, "deconfig"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1068 | } |
Denis Vlasenko | 3538b9a | 2006-09-06 18:36:50 +0000 | [diff] [blame] | 1069 | bb_info_msg("Entering released state"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1070 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1071 | change_listen_mode(LISTEN_NONE); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1072 | state = RELEASED; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1073 | } |
| 1074 | |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1075 | static uint8_t* alloc_dhcp_option(int code, const char *str, int extra) |
| 1076 | { |
| 1077 | uint8_t *storage; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1078 | int len = strnlen(str, 255); |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1079 | storage = xzalloc(len + extra + OPT_DATA); |
| 1080 | storage[OPT_CODE] = code; |
| 1081 | storage[OPT_LEN] = len + extra; |
| 1082 | memcpy(storage + extra + OPT_DATA, str, len); |
| 1083 | return storage; |
| 1084 | } |
| 1085 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1086 | #if BB_MMU |
| 1087 | static void client_background(void) |
| 1088 | { |
| 1089 | bb_daemonize(0); |
| 1090 | logmode &= ~LOGMODE_STDIO; |
| 1091 | /* rewrite pidfile, as our pid is different now */ |
| 1092 | write_pidfile(client_config.pidfile); |
| 1093 | } |
| 1094 | #endif |
| 1095 | |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1096 | //usage:#if defined CONFIG_UDHCP_DEBUG && CONFIG_UDHCP_DEBUG >= 1 |
| 1097 | //usage:# define IF_UDHCP_VERBOSE(...) __VA_ARGS__ |
| 1098 | //usage:#else |
| 1099 | //usage:# define IF_UDHCP_VERBOSE(...) |
| 1100 | //usage:#endif |
| 1101 | //usage:#define udhcpc_trivial_usage |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1102 | //usage: "[-fbnq"IF_UDHCP_VERBOSE("v")"oCRB] [-i IFACE] [-r IP] [-s PROG] [-p PIDFILE]\n" |
Denys Vlasenko | 50089fc | 2011-11-07 15:44:46 +0100 | [diff] [blame] | 1103 | //usage: " [-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] | 1104 | //usage:#define udhcpc_full_usage "\n" |
| 1105 | //usage: IF_LONG_OPTS( |
| 1106 | //usage: "\n -i,--interface IFACE Interface to use (default eth0)" |
| 1107 | //usage: "\n -p,--pidfile FILE Create pidfile" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1108 | //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] | 1109 | //usage: "\n -B,--broadcast Request broadcast replies" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1110 | //usage: "\n -t,--retries N Send up to N discover packets" |
| 1111 | //usage: "\n -T,--timeout N Pause between packets (default 3 seconds)" |
| 1112 | //usage: "\n -A,--tryagain N Wait N seconds after failure (default 20)" |
| 1113 | //usage: "\n -f,--foreground Run in foreground" |
| 1114 | //usage: USE_FOR_MMU( |
| 1115 | //usage: "\n -b,--background Background if lease is not obtained" |
| 1116 | //usage: ) |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1117 | //usage: "\n -n,--now Exit if lease is not obtained" |
| 1118 | //usage: "\n -q,--quit Exit after obtaining lease" |
| 1119 | //usage: "\n -R,--release Release IP on exit" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1120 | //usage: "\n -S,--syslog Log to syslog too" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1121 | //usage: IF_FEATURE_UDHCP_PORT( |
| 1122 | //usage: "\n -P,--client-port N Use port N (default 68)" |
| 1123 | //usage: ) |
| 1124 | //usage: IF_FEATURE_UDHCPC_ARPING( |
| 1125 | //usage: "\n -a,--arping Use arping to validate offered address" |
| 1126 | //usage: ) |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1127 | //usage: "\n -O,--request-option OPT Request option OPT from server (cumulative)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1128 | //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] | 1129 | //usage: "\n -r,--request IP Request this IP address" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1130 | //usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1131 | //usage: "\n Examples of string, numeric, and hex byte opts:" |
| 1132 | //usage: "\n -x hostname:bbox - option 12" |
| 1133 | //usage: "\n -x lease:3600 - option 51 (lease time)" |
| 1134 | //usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1135 | //usage: "\n -F,--fqdn NAME Ask server to update DNS mapping for NAME" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1136 | //usage: "\n -V,--vendorclass VENDOR Vendor identifier (default 'udhcp VERSION')" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1137 | //usage: "\n -C,--clientid-none Don't send MAC as client identifier" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1138 | //usage: IF_UDHCP_VERBOSE( |
| 1139 | //usage: "\n -v Verbose" |
| 1140 | //usage: ) |
| 1141 | //usage: ) |
| 1142 | //usage: IF_NOT_LONG_OPTS( |
| 1143 | //usage: "\n -i IFACE Interface to use (default eth0)" |
| 1144 | //usage: "\n -p FILE Create pidfile" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1145 | //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] | 1146 | //usage: "\n -B Request broadcast replies" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1147 | //usage: "\n -t N Send up to N discover packets" |
| 1148 | //usage: "\n -T N Pause between packets (default 3 seconds)" |
| 1149 | //usage: "\n -A N Wait N seconds (default 20) after failure" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1150 | //usage: "\n -f Run in foreground" |
| 1151 | //usage: USE_FOR_MMU( |
| 1152 | //usage: "\n -b Background if lease is not obtained" |
| 1153 | //usage: ) |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1154 | //usage: "\n -n Exit if lease is not obtained" |
| 1155 | //usage: "\n -q Exit after obtaining lease" |
| 1156 | //usage: "\n -R Release IP on exit" |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1157 | //usage: "\n -S Log to syslog too" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1158 | //usage: IF_FEATURE_UDHCP_PORT( |
| 1159 | //usage: "\n -P N Use port N (default 68)" |
| 1160 | //usage: ) |
| 1161 | //usage: IF_FEATURE_UDHCPC_ARPING( |
| 1162 | //usage: "\n -a Use arping to validate offered address" |
| 1163 | //usage: ) |
Denys Vlasenko | c59e06e | 2010-10-20 16:10:59 +0200 | [diff] [blame] | 1164 | //usage: "\n -O OPT Request option OPT from server (cumulative)" |
| 1165 | //usage: "\n -o Don't request any options (unless -O is given)" |
| 1166 | //usage: "\n -r IP Request this IP address" |
| 1167 | //usage: "\n -x OPT:VAL Include option OPT in sent packets (cumulative)" |
| 1168 | //usage: "\n Examples of string, numeric, and hex byte opts:" |
| 1169 | //usage: "\n -x hostname:bbox - option 12" |
| 1170 | //usage: "\n -x lease:3600 - option 51 (lease time)" |
| 1171 | //usage: "\n -x 0x3d:0100BEEFC0FFEE - option 61 (client id)" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1172 | //usage: "\n -F NAME Ask server to update DNS mapping for NAME" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1173 | //usage: "\n -V VENDOR Vendor identifier (default 'udhcp VERSION')" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1174 | //usage: "\n -C Don't send MAC as client identifier" |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1175 | //usage: IF_UDHCP_VERBOSE( |
| 1176 | //usage: "\n -v Verbose" |
| 1177 | //usage: ) |
| 1178 | //usage: ) |
Denys Vlasenko | 8993c3f | 2010-12-25 06:21:54 +0100 | [diff] [blame] | 1179 | //usage: "\nSignals:" |
Denys Vlasenko | 50089fc | 2011-11-07 15:44:46 +0100 | [diff] [blame] | 1180 | //usage: "\n USR1 Renew lease" |
| 1181 | //usage: "\n USR2 Release lease" |
Denys Vlasenko | 8993c3f | 2010-12-25 06:21:54 +0100 | [diff] [blame] | 1182 | |
Denys Vlasenko | 9e244c7 | 2010-10-20 01:38:56 +0200 | [diff] [blame] | 1183 | |
Denis Vlasenko | 9b49a5e | 2007-10-11 10:05:36 +0000 | [diff] [blame] | 1184 | int udhcpc_main(int argc, char **argv) MAIN_EXTERNALLY_VISIBLE; |
Denis Vlasenko | a60f84e | 2008-07-05 09:18:54 +0000 | [diff] [blame] | 1185 | int udhcpc_main(int argc UNUSED_PARAM, char **argv) |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1186 | { |
| 1187 | uint8_t *temp, *message; |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1188 | const char *str_V, *str_h, *str_F, *str_r; |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1189 | IF_FEATURE_UDHCP_PORT(char *str_P;) |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1190 | void *clientid_mac_ptr; |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1191 | llist_t *list_O = NULL; |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1192 | llist_t *list_x = NULL; |
Denis Vlasenko | 68af8e7 | 2007-11-22 21:41:14 +0000 | [diff] [blame] | 1193 | int tryagain_timeout = 20; |
| 1194 | int discover_timeout = 3; |
| 1195 | int discover_retries = 3; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1196 | uint32_t server_addr = server_addr; /* for compiler */ |
| 1197 | uint32_t requested_ip = 0; |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 1198 | uint32_t xid = xid; /* for compiler */ |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1199 | int packet_num; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1200 | int timeout; /* must be signed */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1201 | unsigned already_waited_sec; |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1202 | unsigned opt; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1203 | int max_fd; |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1204 | int retval; |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1205 | fd_set rfds; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1206 | |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1207 | /* Default options */ |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1208 | IF_FEATURE_UDHCP_PORT(SERVER_PORT = 67;) |
| 1209 | IF_FEATURE_UDHCP_PORT(CLIENT_PORT = 68;) |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1210 | client_config.interface = "eth0"; |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1211 | client_config.script = CONFIG_UDHCPC_DEFAULT_SCRIPT; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1212 | str_V = "udhcp "BB_VER; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1213 | |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1214 | /* Parse command line */ |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1215 | /* O,x: list; -T,-t,-A take numeric param */ |
Leonid Lisovskiy | 6c9c0a1 | 2011-10-18 00:35:47 +0200 | [diff] [blame] | 1216 | opt_complementary = "O::x::T+:t+:A+" IF_UDHCP_VERBOSE(":vv") ; |
Denys Vlasenko | f3b92d3 | 2009-06-19 12:10:38 +0200 | [diff] [blame] | 1217 | IF_LONG_OPTS(applet_long_options = udhcpc_longopts;) |
Keith Young | e6bb8d3 | 2011-03-07 03:18:46 +0100 | [diff] [blame] | 1218 | 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] | 1219 | USE_FOR_MMU("b") |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1220 | IF_FEATURE_UDHCPC_ARPING("a") |
| 1221 | IF_FEATURE_UDHCP_PORT("P:") |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1222 | "v" |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1223 | , &str_V, &str_h, &str_h, &str_F |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1224 | , &client_config.interface, &client_config.pidfile, &str_r /* i,p */ |
| 1225 | , &client_config.script /* s */ |
| 1226 | , &discover_timeout, &discover_retries, &tryagain_timeout /* T,t,A */ |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1227 | , &list_O |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1228 | , &list_x |
Denis Vlasenko | 5e34ff2 | 2009-04-21 11:09:40 +0000 | [diff] [blame] | 1229 | IF_FEATURE_UDHCP_PORT(, &str_P) |
Leonid Lisovskiy | 6c9c0a1 | 2011-10-18 00:35:47 +0200 | [diff] [blame] | 1230 | IF_UDHCP_VERBOSE(, &dhcp_verbose) |
Denys Vlasenko | 7e21f04 | 2011-11-08 11:39:41 +0100 | [diff] [blame] | 1231 | ); |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [diff] [blame] | 1232 | if (opt & (OPT_h|OPT_H)) { |
| 1233 | //msg added 2011-11 |
| 1234 | bb_error_msg("option -h NAME is deprecated, use -x hostname:NAME"); |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1235 | client_config.hostname = alloc_dhcp_option(DHCP_HOST_NAME, str_h, 0); |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [diff] [blame] | 1236 | } |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1237 | if (opt & OPT_F) { |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1238 | /* FQDN option format: [0x51][len][flags][0][0]<fqdn> */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1239 | client_config.fqdn = alloc_dhcp_option(DHCP_FQDN, str_F, 3); |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1240 | /* Flag bits: 0000NEOS |
| 1241 | * S: 1 = Client requests server to update A RR in DNS as well as PTR |
| 1242 | * O: 1 = Server indicates to client that DNS has been updated regardless |
| 1243 | * E: 1 = Name is in DNS format, i.e. <4>host<6>domain<3>com<0>, |
| 1244 | * not "host.domain.com". Format 0 is obsolete. |
| 1245 | * N: 1 = Client requests server to not update DNS (S must be 0 then) |
| 1246 | * Two [0] bytes which follow are deprecated and must be 0. |
| 1247 | */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1248 | client_config.fqdn[OPT_DATA + 0] = 0x1; |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1249 | /*client_config.fqdn[OPT_DATA + 1] = 0; - xzalloc did it */ |
| 1250 | /*client_config.fqdn[OPT_DATA + 2] = 0; */ |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1251 | } |
Denis Vlasenko | e2d3ded | 2006-11-27 23:43:28 +0000 | [diff] [blame] | 1252 | if (opt & OPT_r) |
| 1253 | requested_ip = inet_addr(str_r); |
Denis Vlasenko | d55fe3e | 2008-02-04 13:12:16 +0000 | [diff] [blame] | 1254 | #if ENABLE_FEATURE_UDHCP_PORT |
| 1255 | if (opt & OPT_P) { |
| 1256 | CLIENT_PORT = xatou16(str_P); |
| 1257 | SERVER_PORT = CLIENT_PORT - 1; |
| 1258 | } |
| 1259 | #endif |
Denis Vlasenko | 2e4c3c4 | 2008-04-02 13:04:19 +0000 | [diff] [blame] | 1260 | if (opt & OPT_o) |
| 1261 | client_config.no_default_options = 1; |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1262 | while (list_O) { |
Denis Vlasenko | 18c9302 | 2008-08-27 22:29:43 +0000 | [diff] [blame] | 1263 | char *optstr = llist_pop(&list_O); |
Denys Vlasenko | 5d3aace | 2011-06-04 05:07:16 +0200 | [diff] [blame] | 1264 | unsigned n = bb_strtou(optstr, NULL, 0); |
| 1265 | if (errno || n > 254) { |
| 1266 | n = udhcp_option_idx(optstr); |
| 1267 | n = dhcp_optflags[n].code; |
| 1268 | } |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1269 | client_config.opt_mask[n >> 3] |= 1 << (n & 7); |
Denis Vlasenko | 1918368 | 2007-12-10 07:03:38 +0000 | [diff] [blame] | 1270 | } |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1271 | while (list_x) { |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1272 | char *optstr = llist_pop(&list_x); |
| 1273 | char *colon = strchr(optstr, ':'); |
| 1274 | if (colon) |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1275 | *colon = ' '; |
Denys Vlasenko | 9c0ea86 | 2010-04-04 02:12:03 +0200 | [diff] [blame] | 1276 | /* now it looks similar to udhcpd's config file line: |
| 1277 | * "optname optval", using the common routine: */ |
Denys Vlasenko | 7e6add1 | 2010-03-25 20:32:38 +0100 | [diff] [blame] | 1278 | udhcp_str2optset(optstr, &client_config.options); |
| 1279 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1280 | |
Denys Vlasenko | 26918dd | 2009-06-16 12:04:23 +0200 | [diff] [blame] | 1281 | if (udhcp_read_interface(client_config.interface, |
| 1282 | &client_config.ifindex, |
| 1283 | NULL, |
| 1284 | client_config.client_mac) |
| 1285 | ) { |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1286 | return 1; |
Denys Vlasenko | 26918dd | 2009-06-16 12:04:23 +0200 | [diff] [blame] | 1287 | } |
| 1288 | |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1289 | clientid_mac_ptr = NULL; |
Denys Vlasenko | 1cbdc03 | 2010-10-20 01:42:37 +0200 | [diff] [blame] | 1290 | if (!(opt & OPT_C) && !udhcp_find_option(client_config.options, DHCP_CLIENT_ID)) { |
| 1291 | /* not suppressed and not set, set the default client ID */ |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1292 | client_config.clientid = alloc_dhcp_option(DHCP_CLIENT_ID, "", 7); |
| 1293 | client_config.clientid[OPT_DATA] = 1; /* type: ethernet */ |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1294 | clientid_mac_ptr = client_config.clientid + OPT_DATA+1; |
| 1295 | memcpy(clientid_mac_ptr, client_config.client_mac, 6); |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1296 | } |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [diff] [blame] | 1297 | if (str_V[0] != '\0') { |
| 1298 | // can drop -V, str_V, client_config.vendorclass, |
| 1299 | // but need to add "vendor" to the list of recognized |
| 1300 | // string opts for this to work; |
| 1301 | // and need to tweak add_client_options() too... |
| 1302 | // ...so the question is, should we? |
| 1303 | //bb_error_msg("option -V VENDOR is deprecated, use -x vendor:VENDOR"); |
Denys Vlasenko | 87fa216 | 2010-03-20 18:06:23 +0100 | [diff] [blame] | 1304 | client_config.vendorclass = alloc_dhcp_option(DHCP_VENDOR, str_V, 0); |
Denys Vlasenko | 2017d48 | 2011-11-05 01:24:14 +0100 | [diff] [blame] | 1305 | } |
| 1306 | |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1307 | #if !BB_MMU |
| 1308 | /* on NOMMU reexec (i.e., background) early */ |
| 1309 | if (!(opt & OPT_f)) { |
| 1310 | bb_daemonize_or_rexec(0 /* flags */, argv); |
Denis Vlasenko | a19e649 | 2009-03-11 14:40:00 +0000 | [diff] [blame] | 1311 | logmode = LOGMODE_NONE; |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1312 | } |
| 1313 | #endif |
| 1314 | if (opt & OPT_S) { |
Denis Vlasenko | 5e4fda0 | 2009-03-08 23:46:48 +0000 | [diff] [blame] | 1315 | openlog(applet_name, LOG_PID, LOG_DAEMON); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1316 | logmode |= LOGMODE_SYSLOG; |
| 1317 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1318 | |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1319 | /* Make sure fd 0,1,2 are open */ |
| 1320 | bb_sanitize_stdio(); |
| 1321 | /* Equivalent of doing a fflush after every \n */ |
| 1322 | setlinebuf(stdout); |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1323 | /* Create pidfile */ |
| 1324 | write_pidfile(client_config.pidfile); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1325 | /* Goes to stdout (unless NOMMU) and possibly syslog */ |
Denis Vlasenko | def8898 | 2007-10-07 17:06:01 +0000 | [diff] [blame] | 1326 | bb_info_msg("%s (v"BB_VER") started", applet_name); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1327 | /* Set up the signal pipe */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1328 | udhcp_sp_setup(); |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 1329 | /* We want random_xid to be random... */ |
| 1330 | srand(monotonic_us()); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1331 | |
| 1332 | state = INIT_SELECTING; |
Rob Landley | 3f78561 | 2006-05-28 01:06:36 +0000 | [diff] [blame] | 1333 | udhcp_run_script(NULL, "deconfig"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1334 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1335 | packet_num = 0; |
Denis Vlasenko | fc9e108 | 2008-05-26 17:32:35 +0000 | [diff] [blame] | 1336 | timeout = 0; |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1337 | already_waited_sec = 0; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1338 | |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1339 | /* Main event loop. select() waits on signal pipe and possibly |
| 1340 | * on sockfd. |
| 1341 | * "continue" statements in code below jump to the top of the loop. |
| 1342 | */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1343 | for (;;) { |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1344 | struct timeval tv; |
| 1345 | struct dhcp_packet packet; |
Denis Vlasenko | ec64a57 | 2009-01-14 00:28:03 +0000 | [diff] [blame] | 1346 | /* silence "uninitialized!" warning */ |
| 1347 | unsigned timestamp_before_wait = timestamp_before_wait; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1348 | |
Denis Vlasenko | 517413f | 2008-12-10 11:16:47 +0000 | [diff] [blame] | 1349 | //bb_error_msg("sockfd:%d, listen_mode:%d", sockfd, listen_mode); |
| 1350 | |
| 1351 | /* Was opening raw or udp socket here |
| 1352 | * if (listen_mode != LISTEN_NONE && sockfd < 0), |
| 1353 | * but on fast network renew responses return faster |
| 1354 | * than we open sockets. Thus this code is moved |
| 1355 | * to change_listen_mode(). Thus we open listen socket |
| 1356 | * BEFORE we send renew request (see "case BOUND:"). */ |
| 1357 | |
Denis Vlasenko | fbd2918 | 2007-04-07 01:05:47 +0000 | [diff] [blame] | 1358 | max_fd = udhcp_sp_fd_set(&rfds, sockfd); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1359 | |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1360 | tv.tv_sec = timeout - already_waited_sec; |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1361 | tv.tv_usec = 0; |
Denys Vlasenko | 8d11445 | 2010-03-22 13:44:09 +0100 | [diff] [blame] | 1362 | retval = 0; |
| 1363 | /* If we already timed out, fall through with retval = 0, else... */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1364 | if ((int)tv.tv_sec > 0) { |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1365 | timestamp_before_wait = (unsigned)monotonic_sec(); |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1366 | log1("Waiting on select..."); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1367 | retval = select(max_fd + 1, &rfds, NULL, NULL, &tv); |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1368 | if (retval < 0) { |
| 1369 | /* EINTR? A signal was caught, don't panic */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1370 | if (errno == EINTR) { |
| 1371 | already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait; |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1372 | continue; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1373 | } |
Denis Vlasenko | 80edead | 2007-08-02 22:31:05 +0000 | [diff] [blame] | 1374 | /* Else: an error occured, panic! */ |
| 1375 | bb_perror_msg_and_die("select"); |
| 1376 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1377 | } |
| 1378 | |
| 1379 | /* If timeout dropped to zero, time to become active: |
| 1380 | * resend discover/renew/whatever |
| 1381 | */ |
| 1382 | if (retval == 0) { |
Denys Vlasenko | a5048fa | 2010-10-20 21:38:29 +0200 | [diff] [blame] | 1383 | /* When running on a bridge, the ifindex may have changed |
| 1384 | * (e.g. if member interfaces were added/removed |
| 1385 | * or if the status of the bridge changed). |
| 1386 | * Refresh ifindex and client_mac: |
| 1387 | */ |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1388 | if (udhcp_read_interface(client_config.interface, |
| 1389 | &client_config.ifindex, |
| 1390 | NULL, |
| 1391 | client_config.client_mac) |
| 1392 | ) { |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1393 | goto ret0; /* iface is gone? */ |
Denys Vlasenko | 5d374e9 | 2010-10-20 22:26:38 +0200 | [diff] [blame] | 1394 | } |
| 1395 | if (clientid_mac_ptr) |
| 1396 | memcpy(clientid_mac_ptr, client_config.client_mac, 6); |
Denys Vlasenko | a5048fa | 2010-10-20 21:38:29 +0200 | [diff] [blame] | 1397 | |
Denis Vlasenko | f1980f6 | 2008-09-26 09:34:59 +0000 | [diff] [blame] | 1398 | /* We will restart the wait in any case */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1399 | already_waited_sec = 0; |
| 1400 | |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1401 | switch (state) { |
| 1402 | case INIT_SELECTING: |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1403 | if (packet_num < discover_retries) { |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1404 | if (packet_num == 0) |
| 1405 | xid = random_xid(); |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1406 | /* broadcast */ |
| 1407 | send_discover(xid, requested_ip); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1408 | timeout = discover_timeout; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1409 | packet_num++; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1410 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1411 | } |
Denis Vlasenko | cdb0b65 | 2008-09-26 09:34:15 +0000 | [diff] [blame] | 1412 | leasefail: |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1413 | udhcp_run_script(NULL, "leasefail"); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1414 | #if BB_MMU /* -b is not supported on NOMMU */ |
| 1415 | if (opt & OPT_b) { /* background if no lease */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1416 | bb_info_msg("No lease, forking to background"); |
| 1417 | client_background(); |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1418 | /* do not background again! */ |
| 1419 | opt = ((opt & ~OPT_b) | OPT_f); |
| 1420 | } else |
| 1421 | #endif |
| 1422 | if (opt & OPT_n) { /* abort if no lease */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1423 | bb_info_msg("No lease, failing"); |
| 1424 | retval = 1; |
| 1425 | goto ret; |
| 1426 | } |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1427 | /* wait before trying again */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1428 | timeout = tryagain_timeout; |
| 1429 | packet_num = 0; |
| 1430 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1431 | case REQUESTING: |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1432 | if (packet_num < discover_retries) { |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1433 | /* send broadcast select packet */ |
| 1434 | send_select(xid, server_addr, requested_ip); |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1435 | timeout = discover_timeout; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1436 | packet_num++; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1437 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1438 | } |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1439 | /* Timed out, go back to init state. |
| 1440 | * "discover...select...discover..." loops |
Denis Vlasenko | 7d9399e | 2008-09-26 22:21:03 +0000 | [diff] [blame] | 1441 | * were seen in the wild. Treat them similarly |
Denis Vlasenko | cdb0b65 | 2008-09-26 09:34:15 +0000 | [diff] [blame] | 1442 | * to "no response to discover" case */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1443 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | 7d9399e | 2008-09-26 22:21:03 +0000 | [diff] [blame] | 1444 | state = INIT_SELECTING; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1445 | goto leasefail; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1446 | case BOUND: |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1447 | /* 1/2 lease passed, enter renewing state */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1448 | state = RENEWING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1449 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1450 | change_listen_mode(LISTEN_KERNEL); |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1451 | log1("Entering renew state"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1452 | /* fall right through */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1453 | case RENEW_REQUESTED: /* manual (SIGUSR1) renew */ |
| 1454 | case_RENEW_REQUESTED: |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1455 | case RENEWING: |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1456 | if (timeout > 60) { |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1457 | /* send an unicast renew request */ |
| 1458 | /* Sometimes observed to fail (EADDRNOTAVAIL) to bind |
| 1459 | * a new UDP socket for sending inside send_renew. |
| 1460 | * I hazard to guess existing listening socket |
| 1461 | * is somehow conflicting with it, but why is it |
| 1462 | * not deterministic then?! Strange. |
Denys Vlasenko | 753a3ce | 2009-07-19 04:27:10 +0200 | [diff] [blame] | 1463 | * Anyway, it does recover by eventually failing through |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1464 | * into INIT_SELECTING state. |
| 1465 | */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1466 | send_renew(xid, server_addr, requested_ip); |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1467 | timeout >>= 1; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1468 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1469 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1470 | /* Timed out, enter rebinding state */ |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1471 | log1("Entering rebinding state"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1472 | state = REBINDING; |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1473 | /* fall right through */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1474 | case REBINDING: |
Denys Vlasenko | 219757f | 2009-10-08 23:05:46 +0200 | [diff] [blame] | 1475 | /* Switch to bcast receive */ |
| 1476 | change_listen_mode(LISTEN_RAW); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1477 | /* Lease is *really* about to run out, |
| 1478 | * try to find DHCP server using broadcast */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1479 | if (timeout > 0) { |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1480 | /* send a broadcast renew request */ |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1481 | send_renew(xid, 0 /*INADDR_ANY*/, requested_ip); |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1482 | timeout >>= 1; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1483 | continue; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1484 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1485 | /* Timed out, enter init state */ |
| 1486 | bb_info_msg("Lease lost, entering init state"); |
| 1487 | udhcp_run_script(NULL, "deconfig"); |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1488 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1489 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1490 | /*timeout = 0; - already is */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1491 | packet_num = 0; |
| 1492 | continue; |
| 1493 | /* case RELEASED: */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1494 | } |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1495 | /* yah, I know, *you* say it would never happen */ |
| 1496 | timeout = INT_MAX; |
| 1497 | continue; /* back to main loop */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1498 | } /* if select timed out */ |
| 1499 | |
| 1500 | /* select() didn't timeout, something happened */ |
| 1501 | |
| 1502 | /* Is it a signal? */ |
| 1503 | /* note: udhcp_sp_read checks FD_ISSET before reading */ |
| 1504 | switch (udhcp_sp_read(&rfds)) { |
| 1505 | case SIGUSR1: |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1506 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1507 | already_waited_sec = 0; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1508 | perform_renew(); |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1509 | if (state == RENEW_REQUESTED) { |
| 1510 | /* We might be either on the same network |
| 1511 | * (in which case renew might work), |
| 1512 | * or we might be on a completely different one |
| 1513 | * (in which case renew won't ever succeed). |
| 1514 | * For the second case, must make sure timeout |
| 1515 | * is not too big, or else we can send |
| 1516 | * futile renew requests for hours. |
| 1517 | * (Ab)use -A TIMEOUT value (usually 20 sec) |
| 1518 | * as a cap on the timeout. |
| 1519 | */ |
| 1520 | if (timeout > tryagain_timeout) |
| 1521 | timeout = tryagain_timeout; |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1522 | goto case_RENEW_REQUESTED; |
Vladislav Grishenko | 6464f15 | 2011-10-18 01:37:47 +0200 | [diff] [blame] | 1523 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1524 | /* Start things over */ |
| 1525 | packet_num = 0; |
Denys Vlasenko | 7d6a791 | 2009-07-19 04:24:23 +0200 | [diff] [blame] | 1526 | /* Kill any timeouts, user wants this to hurry along */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1527 | timeout = 0; |
| 1528 | continue; |
| 1529 | case SIGUSR2: |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1530 | perform_release(server_addr, requested_ip); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1531 | timeout = INT_MAX; |
| 1532 | continue; |
| 1533 | case SIGTERM: |
| 1534 | bb_info_msg("Received SIGTERM"); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1535 | goto ret0; |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1536 | } |
| 1537 | |
Denis Vlasenko | 739e30f | 2008-09-26 23:45:20 +0000 | [diff] [blame] | 1538 | /* Is it a packet? */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1539 | if (listen_mode == LISTEN_NONE || !FD_ISSET(sockfd, &rfds)) |
| 1540 | continue; /* no */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1541 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1542 | { |
| 1543 | int len; |
| 1544 | |
| 1545 | /* A packet is ready, read it */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1546 | if (listen_mode == LISTEN_KERNEL) |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1547 | len = udhcp_recv_kernel_packet(&packet, sockfd); |
Denis Vlasenko | b76b9a4 | 2008-01-25 22:46:34 +0000 | [diff] [blame] | 1548 | else |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1549 | len = udhcp_recv_raw_packet(&packet, sockfd); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1550 | if (len == -1) { |
| 1551 | /* Error is severe, reopen socket */ |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1552 | bb_info_msg("Read error: %s, reopening socket", strerror(errno)); |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1553 | sleep(discover_timeout); /* 3 seconds by default */ |
| 1554 | change_listen_mode(listen_mode); /* just close and reopen */ |
| 1555 | } |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1556 | /* If this packet will turn out to be unrelated/bogus, |
| 1557 | * we will go back and wait for next one. |
| 1558 | * Be sure timeout is properly decreased. */ |
Denis Vlasenko | 19903f0 | 2008-05-21 07:03:03 +0000 | [diff] [blame] | 1559 | already_waited_sec += (unsigned)monotonic_sec() - timestamp_before_wait; |
Denis Vlasenko | 6de8994 | 2008-05-21 07:05:06 +0000 | [diff] [blame] | 1560 | if (len < 0) |
| 1561 | continue; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1562 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1563 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1564 | if (packet.xid != xid) { |
| 1565 | log1("xid %x (our is %x), ignoring packet", |
| 1566 | (unsigned)packet.xid, (unsigned)xid); |
| 1567 | continue; |
| 1568 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1569 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1570 | /* Ignore packets that aren't for us */ |
| 1571 | if (packet.hlen != 6 |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 1572 | || memcmp(packet.chaddr, client_config.client_mac, 6) != 0 |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1573 | ) { |
Denys Vlasenko | ac906fa | 2009-06-17 11:54:52 +0200 | [diff] [blame] | 1574 | //FIXME: need to also check that last 10 bytes are zero |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1575 | log1("chaddr does not match, ignoring packet"); // log2? |
| 1576 | continue; |
| 1577 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1578 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1579 | message = udhcp_get_option(&packet, DHCP_MESSAGE_TYPE); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1580 | if (message == NULL) { |
| 1581 | bb_error_msg("no message type option, ignoring packet"); |
| 1582 | continue; |
| 1583 | } |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1584 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1585 | switch (state) { |
| 1586 | case INIT_SELECTING: |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 1587 | /* Must be a DHCPOFFER */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1588 | if (*message == DHCPOFFER) { |
Denys Vlasenko | 2af2acf | 2011-10-20 14:47:41 +0200 | [diff] [blame] | 1589 | /* What exactly is server's IP? There are several values. |
| 1590 | * Example DHCP offer captured with tchdump: |
| 1591 | * |
| 1592 | * 10.34.25.254:67 > 10.34.25.202:68 // IP header's src |
| 1593 | * BOOTP fields: |
| 1594 | * Your-IP 10.34.25.202 |
| 1595 | * Server-IP 10.34.32.125 // "next server" IP |
| 1596 | * Gateway-IP 10.34.25.254 // relay's address (if DHCP relays are in use) |
| 1597 | * DHCP options: |
| 1598 | * DHCP-Message Option 53, length 1: Offer |
| 1599 | * Server-ID Option 54, length 4: 10.34.255.7 // "server ID" |
| 1600 | * Default-Gateway Option 3, length 4: 10.34.25.254 // router |
| 1601 | * |
| 1602 | * We think that real server IP (one to use in renew/release) |
| 1603 | * is one in Server-ID option. But I am not 100% sure. |
Denys Vlasenko | ee320c6 | 2011-10-23 18:05:58 +0200 | [diff] [blame] | 1604 | * IP header's src and Gateway-IP (same in this example) |
Denys Vlasenko | 2af2acf | 2011-10-20 14:47:41 +0200 | [diff] [blame] | 1605 | * might work too. |
| 1606 | * "Next server" and router are definitely wrong ones to use, though... |
| 1607 | */ |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1608 | temp = udhcp_get_option(&packet, DHCP_SERVER_ID); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1609 | if (!temp) { |
Denys Vlasenko | c72c1d7 | 2010-10-20 22:08:16 +0200 | [diff] [blame] | 1610 | bb_error_msg("no server ID, ignoring packet"); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1611 | continue; |
| 1612 | /* still selecting - this server looks bad */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1613 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1614 | /* it IS unaligned sometimes, don't "optimize" */ |
| 1615 | move_from_unaligned32(server_addr, temp); |
Denys Vlasenko | b3af65b | 2010-10-20 21:37:23 +0200 | [diff] [blame] | 1616 | /*xid = packet.xid; - already is */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1617 | requested_ip = packet.yiaddr; |
| 1618 | |
| 1619 | /* enter requesting state */ |
| 1620 | state = REQUESTING; |
| 1621 | timeout = 0; |
| 1622 | packet_num = 0; |
| 1623 | already_waited_sec = 0; |
| 1624 | } |
| 1625 | continue; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1626 | case REQUESTING: |
| 1627 | case RENEWING: |
Denys Vlasenko | 13ca4b1 | 2009-07-19 04:07:21 +0200 | [diff] [blame] | 1628 | case RENEW_REQUESTED: |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1629 | case REBINDING: |
| 1630 | if (*message == DHCPACK) { |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1631 | uint32_t lease_seconds; |
| 1632 | struct in_addr temp_addr; |
| 1633 | |
Denys Vlasenko | dde8bdc | 2010-03-22 14:29:13 +0100 | [diff] [blame] | 1634 | temp = udhcp_get_option(&packet, DHCP_LEASE_TIME); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1635 | if (!temp) { |
| 1636 | bb_error_msg("no lease time with ACK, using 1 hour lease"); |
| 1637 | lease_seconds = 60 * 60; |
| 1638 | } else { |
| 1639 | /* it IS unaligned sometimes, don't "optimize" */ |
| 1640 | move_from_unaligned32(lease_seconds, temp); |
| 1641 | lease_seconds = ntohl(lease_seconds); |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1642 | /* paranoia: must not be too small and not prone to overflows */ |
| 1643 | if (lease_seconds < 0x10) |
| 1644 | lease_seconds = 0x10; |
| 1645 | if (lease_seconds >= 0x10000000) |
| 1646 | lease_seconds = 0x0fffffff; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1647 | } |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1648 | #if ENABLE_FEATURE_UDHCPC_ARPING |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1649 | if (opt & OPT_a) { |
Denis Vlasenko | 739e30f | 2008-09-26 23:45:20 +0000 | [diff] [blame] | 1650 | /* RFC 2131 3.1 paragraph 5: |
| 1651 | * "The client receives the DHCPACK message with configuration |
| 1652 | * parameters. The client SHOULD perform a final check on the |
| 1653 | * parameters (e.g., ARP for allocated network address), and notes |
| 1654 | * the duration of the lease specified in the DHCPACK message. At this |
| 1655 | * point, the client is configured. If the client detects that the |
| 1656 | * address is already in use (e.g., through the use of ARP), |
| 1657 | * the client MUST send a DHCPDECLINE message to the server and restarts |
| 1658 | * the configuration process..." */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1659 | if (!arpping(packet.yiaddr, |
| 1660 | NULL, |
| 1661 | (uint32_t) 0, |
| 1662 | client_config.client_mac, |
| 1663 | client_config.interface) |
| 1664 | ) { |
| 1665 | bb_info_msg("Offered address is in use " |
| 1666 | "(got ARP reply), declining"); |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 1667 | send_decline(/*xid,*/ server_addr, packet.yiaddr); |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1668 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1669 | if (state != REQUESTING) |
| 1670 | udhcp_run_script(NULL, "deconfig"); |
| 1671 | change_listen_mode(LISTEN_RAW); |
| 1672 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1673 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1674 | requested_ip = 0; |
| 1675 | timeout = tryagain_timeout; |
| 1676 | packet_num = 0; |
| 1677 | already_waited_sec = 0; |
| 1678 | continue; /* back to main loop */ |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1679 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1680 | } |
Denis Vlasenko | 223bc97 | 2007-11-22 00:58:49 +0000 | [diff] [blame] | 1681 | #endif |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1682 | /* enter bound state */ |
| 1683 | timeout = lease_seconds / 2; |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1684 | temp_addr.s_addr = packet.yiaddr; |
| 1685 | bb_info_msg("Lease of %s obtained, lease time %u", |
| 1686 | inet_ntoa(temp_addr), (unsigned)lease_seconds); |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1687 | requested_ip = packet.yiaddr; |
Denys Vlasenko | 4abfc26 | 2009-07-19 04:35:16 +0200 | [diff] [blame] | 1688 | udhcp_run_script(&packet, state == REQUESTING ? "bound" : "renew"); |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1689 | |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1690 | state = BOUND; |
| 1691 | change_listen_mode(LISTEN_NONE); |
| 1692 | if (opt & OPT_q) { /* quit after lease */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1693 | goto ret0; |
| 1694 | } |
Justin Maggard | aa369e0 | 2009-08-13 01:26:17 +0200 | [diff] [blame] | 1695 | /* future renew failures should not exit (JM) */ |
| 1696 | opt &= ~OPT_n; |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1697 | #if BB_MMU /* NOMMU case backgrounded earlier */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1698 | if (!(opt & OPT_f)) { |
| 1699 | client_background(); |
| 1700 | /* do not background again! */ |
| 1701 | opt = ((opt & ~OPT_b) | OPT_f); |
| 1702 | } |
Denis Vlasenko | 21765fa | 2008-06-13 20:44:05 +0000 | [diff] [blame] | 1703 | #endif |
Denys Vlasenko | 860491c | 2011-11-18 02:09:13 +0100 | [diff] [blame] | 1704 | /* make future renew packets use different xid */ |
| 1705 | /* xid = random_xid(); ...but why bother? */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1706 | already_waited_sec = 0; |
| 1707 | continue; /* back to main loop */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1708 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1709 | if (*message == DHCPNAK) { |
| 1710 | /* return to init state */ |
| 1711 | bb_info_msg("Received DHCP NAK"); |
| 1712 | udhcp_run_script(&packet, "nak"); |
| 1713 | if (state != REQUESTING) |
| 1714 | udhcp_run_script(NULL, "deconfig"); |
| 1715 | change_listen_mode(LISTEN_RAW); |
| 1716 | sleep(3); /* avoid excessive network traffic */ |
| 1717 | state = INIT_SELECTING; |
Denys Vlasenko | 9ac5596 | 2011-03-12 05:37:54 +0100 | [diff] [blame] | 1718 | client_config.first_secs = 0; /* make secs field count from 0 */ |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1719 | requested_ip = 0; |
Denis Vlasenko | b539c84 | 2007-11-29 08:17:45 +0000 | [diff] [blame] | 1720 | timeout = 0; |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1721 | packet_num = 0; |
| 1722 | already_waited_sec = 0; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1723 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1724 | continue; |
| 1725 | /* case BOUND: - ignore all packets */ |
| 1726 | /* case RELEASED: - ignore all packets */ |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1727 | } |
Denys Vlasenko | 4248c33 | 2009-06-26 23:23:16 +0200 | [diff] [blame] | 1728 | /* back to main loop */ |
Denis Vlasenko | 9cdfd14 | 2007-11-22 01:00:00 +0000 | [diff] [blame] | 1729 | } /* for (;;) - main loop ends */ |
| 1730 | |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 1731 | ret0: |
Denys Vlasenko | 0fd4347 | 2011-11-07 00:54:27 +0100 | [diff] [blame] | 1732 | if (opt & OPT_R) /* release on quit */ |
| 1733 | perform_release(server_addr, requested_ip); |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 1734 | retval = 0; |
| 1735 | ret: |
Denis Vlasenko | b234291 | 2008-05-21 07:02:16 +0000 | [diff] [blame] | 1736 | /*if (client_config.pidfile) - remove_pidfile has its own check */ |
Denis Vlasenko | 6e6d331 | 2007-05-03 23:39:35 +0000 | [diff] [blame] | 1737 | remove_pidfile(client_config.pidfile); |
| 1738 | return retval; |
Mike Frysinger | 7031f62 | 2006-05-08 03:20:50 +0000 | [diff] [blame] | 1739 | } |