1*5c6453b8Skrw /* $OpenBSD: options.c,v 1.102 2017/08/28 17:33:42 krw Exp $ */ 29a2590e5Sderaadt 3e7eb2effShenning /* DHCP options parsing and reassembly. */ 49a2590e5Sderaadt 59a2590e5Sderaadt /* 69a2590e5Sderaadt * Copyright (c) 1995, 1996, 1997, 1998 The Internet Software Consortium. 79a2590e5Sderaadt * All rights reserved. 89a2590e5Sderaadt * 99a2590e5Sderaadt * Redistribution and use in source and binary forms, with or without 109a2590e5Sderaadt * modification, are permitted provided that the following conditions 119a2590e5Sderaadt * are met: 129a2590e5Sderaadt * 139a2590e5Sderaadt * 1. Redistributions of source code must retain the above copyright 149a2590e5Sderaadt * notice, this list of conditions and the following disclaimer. 159a2590e5Sderaadt * 2. Redistributions in binary form must reproduce the above copyright 169a2590e5Sderaadt * notice, this list of conditions and the following disclaimer in the 179a2590e5Sderaadt * documentation and/or other materials provided with the distribution. 189a2590e5Sderaadt * 3. Neither the name of The Internet Software Consortium nor the names 199a2590e5Sderaadt * of its contributors may be used to endorse or promote products derived 209a2590e5Sderaadt * from this software without specific prior written permission. 219a2590e5Sderaadt * 229a2590e5Sderaadt * THIS SOFTWARE IS PROVIDED BY THE INTERNET SOFTWARE CONSORTIUM AND 239a2590e5Sderaadt * CONTRIBUTORS ``AS IS'' AND ANY EXPRESS OR IMPLIED WARRANTIES, 249a2590e5Sderaadt * INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF 259a2590e5Sderaadt * MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE 269a2590e5Sderaadt * DISCLAIMED. IN NO EVENT SHALL THE INTERNET SOFTWARE CONSORTIUM OR 279a2590e5Sderaadt * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, 289a2590e5Sderaadt * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT 299a2590e5Sderaadt * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF 309a2590e5Sderaadt * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 319a2590e5Sderaadt * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 329a2590e5Sderaadt * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 339a2590e5Sderaadt * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 349a2590e5Sderaadt * SUCH DAMAGE. 359a2590e5Sderaadt * 369a2590e5Sderaadt * This software has been written for the Internet Software Consortium 379a2590e5Sderaadt * by Ted Lemon <mellon@fugue.com> in cooperation with Vixie 389a2590e5Sderaadt * Enterprises. To learn more about the Internet Software Consortium, 399a2590e5Sderaadt * see ``http://www.vix.com/isc''. To learn more about Vixie 409a2590e5Sderaadt * Enterprises, see ``http://www.vix.com''. 419a2590e5Sderaadt */ 429a2590e5Sderaadt 43711cae1eSkrw #include <sys/queue.h> 44711cae1eSkrw #include <sys/socket.h> 459a2590e5Sderaadt 46711cae1eSkrw #include <arpa/inet.h> 47711cae1eSkrw 48711cae1eSkrw #include <net/if.h> 49711cae1eSkrw 50711cae1eSkrw #include <netinet/in.h> 51711cae1eSkrw #include <netinet/if_ether.h> 52711cae1eSkrw 53711cae1eSkrw #include <ctype.h> 54711cae1eSkrw #include <signal.h> 55711cae1eSkrw #include <stdio.h> 56711cae1eSkrw #include <stdlib.h> 57711cae1eSkrw #include <string.h> 588d2bd14bSkrw #include <vis.h> 598d2bd14bSkrw 60711cae1eSkrw #include "dhcp.h" 61711cae1eSkrw #include "dhcpd.h" 62385a6373Skrw #include "log.h" 63711cae1eSkrw 6402e02bd5Skrw int parse_option_buffer(struct option_data *, unsigned char *, int); 65968fe952Skrw int expand_search_domain_name(unsigned char *, size_t, int *, unsigned char *); 669a2590e5Sderaadt 67c714dadcShenning /* 688457ebc2Skrw * DHCP Option names, formats and codes, from RFC1533. 698457ebc2Skrw * 708457ebc2Skrw * Format codes: 718457ebc2Skrw * 728457ebc2Skrw * e - end of data 738457ebc2Skrw * I - IP address 748457ebc2Skrw * l - 32-bit signed integer 758457ebc2Skrw * L - 32-bit unsigned integer 768457ebc2Skrw * S - 16-bit unsigned integer 778457ebc2Skrw * B - 8-bit unsigned integer 788457ebc2Skrw * t - ASCII text 798457ebc2Skrw * f - flag (true or false) 808457ebc2Skrw * A - array of whatever precedes (e.g., IA means array of IP addresses) 818457ebc2Skrw * C - CIDR description 828457ebc2Skrw */ 838457ebc2Skrw 848457ebc2Skrw static const struct { 858457ebc2Skrw char *name; 868457ebc2Skrw char *format; 878457ebc2Skrw } dhcp_options[DHO_COUNT] = { 888457ebc2Skrw /* 0 */ { "pad", "" }, 898457ebc2Skrw /* 1 */ { "subnet-mask", "I" }, 908457ebc2Skrw /* 2 */ { "time-offset", "l" }, 918457ebc2Skrw /* 3 */ { "routers", "IA" }, 928457ebc2Skrw /* 4 */ { "time-servers", "IA" }, 938457ebc2Skrw /* 5 */ { "ien116-name-servers", "IA" }, 948457ebc2Skrw /* 6 */ { "domain-name-servers", "IA" }, 958457ebc2Skrw /* 7 */ { "log-servers", "IA" }, 968457ebc2Skrw /* 8 */ { "cookie-servers", "IA" }, 978457ebc2Skrw /* 9 */ { "lpr-servers", "IA" }, 988457ebc2Skrw /* 10 */ { "impress-servers", "IA" }, 998457ebc2Skrw /* 11 */ { "resource-location-servers", "IA" }, 1008457ebc2Skrw /* 12 */ { "host-name", "t" }, 1018457ebc2Skrw /* 13 */ { "boot-size", "S" }, 1028457ebc2Skrw /* 14 */ { "merit-dump", "t" }, 1038457ebc2Skrw /* 15 */ { "domain-name", "t" }, 1048457ebc2Skrw /* 16 */ { "swap-server", "I" }, 1058457ebc2Skrw /* 17 */ { "root-path", "t" }, 1068457ebc2Skrw /* 18 */ { "extensions-path", "t" }, 1078457ebc2Skrw /* 19 */ { "ip-forwarding", "f" }, 1088457ebc2Skrw /* 20 */ { "non-local-source-routing", "f" }, 1098457ebc2Skrw /* 21 */ { "policy-filter", "IIA" }, 1108457ebc2Skrw /* 22 */ { "max-dgram-reassembly", "S" }, 1118457ebc2Skrw /* 23 */ { "default-ip-ttl", "B" }, 1128457ebc2Skrw /* 24 */ { "path-mtu-aging-timeout", "L" }, 1138457ebc2Skrw /* 25 */ { "path-mtu-plateau-table", "SA" }, 1148457ebc2Skrw /* 26 */ { "interface-mtu", "S" }, 1158457ebc2Skrw /* 27 */ { "all-subnets-local", "f" }, 1168457ebc2Skrw /* 28 */ { "broadcast-address", "I" }, 1178457ebc2Skrw /* 29 */ { "perform-mask-discovery", "f" }, 1188457ebc2Skrw /* 30 */ { "mask-supplier", "f" }, 1198457ebc2Skrw /* 31 */ { "router-discovery", "f" }, 1208457ebc2Skrw /* 32 */ { "router-solicitation-address", "I" }, 1218457ebc2Skrw /* 33 */ { "static-routes", "IIA" }, 1228457ebc2Skrw /* 34 */ { "trailer-encapsulation", "f" }, 1238457ebc2Skrw /* 35 */ { "arp-cache-timeout", "L" }, 1248457ebc2Skrw /* 36 */ { "ieee802-3-encapsulation", "f" }, 1258457ebc2Skrw /* 37 */ { "default-tcp-ttl", "B" }, 1268457ebc2Skrw /* 38 */ { "tcp-keepalive-interval", "L" }, 1278457ebc2Skrw /* 39 */ { "tcp-keepalive-garbage", "f" }, 1288457ebc2Skrw /* 40 */ { "nis-domain", "t" }, 1298457ebc2Skrw /* 41 */ { "nis-servers", "IA" }, 1308457ebc2Skrw /* 42 */ { "ntp-servers", "IA" }, 1318457ebc2Skrw /* 43 */ { "vendor-encapsulated-options", "X" }, 1328457ebc2Skrw /* 44 */ { "netbios-name-servers", "IA" }, 1338457ebc2Skrw /* 45 */ { "netbios-dd-server", "IA" }, 1348457ebc2Skrw /* 46 */ { "netbios-node-type", "B" }, 1358457ebc2Skrw /* 47 */ { "netbios-scope", "t" }, 1368457ebc2Skrw /* 48 */ { "font-servers", "IA" }, 1378457ebc2Skrw /* 49 */ { "x-display-manager", "IA" }, 1388457ebc2Skrw /* 50 */ { "dhcp-requested-address", "I" }, 1398457ebc2Skrw /* 51 */ { "dhcp-lease-time", "L" }, 1408457ebc2Skrw /* 52 */ { "dhcp-option-overload", "B" }, 1418457ebc2Skrw /* 53 */ { "dhcp-message-type", "B" }, 1428457ebc2Skrw /* 54 */ { "dhcp-server-identifier", "I" }, 1438457ebc2Skrw /* 55 */ { "dhcp-parameter-request-list", "BA" }, 1448457ebc2Skrw /* 56 */ { "dhcp-message", "t" }, 1458457ebc2Skrw /* 57 */ { "dhcp-max-message-size", "S" }, 1468457ebc2Skrw /* 58 */ { "dhcp-renewal-time", "L" }, 1478457ebc2Skrw /* 59 */ { "dhcp-rebinding-time", "L" }, 1488457ebc2Skrw /* 60 */ { "dhcp-class-identifier", "t" }, 1498457ebc2Skrw /* 61 */ { "dhcp-client-identifier", "X" }, 1508457ebc2Skrw /* 62 */ { NULL, NULL }, 1518457ebc2Skrw /* 63 */ { NULL, NULL }, 1528457ebc2Skrw /* 64 */ { "nisplus-domain", "t" }, 1538457ebc2Skrw /* 65 */ { "nisplus-servers", "IA" }, 1548457ebc2Skrw /* 66 */ { "tftp-server-name", "t" }, 1558457ebc2Skrw /* 67 */ { "bootfile-name", "t" }, 1568457ebc2Skrw /* 68 */ { "mobile-ip-home-agent", "IA" }, 1578457ebc2Skrw /* 69 */ { "smtp-server", "IA" }, 1588457ebc2Skrw /* 70 */ { "pop-server", "IA" }, 1598457ebc2Skrw /* 71 */ { "nntp-server", "IA" }, 1608457ebc2Skrw /* 72 */ { "www-server", "IA" }, 1618457ebc2Skrw /* 73 */ { "finger-server", "IA" }, 1628457ebc2Skrw /* 74 */ { "irc-server", "IA" }, 1638457ebc2Skrw /* 75 */ { "streettalk-server", "IA" }, 1648457ebc2Skrw /* 76 */ { "streettalk-directory-assistance-server", "IA" }, 1658457ebc2Skrw /* 77 */ { "user-class", "t" }, 1668457ebc2Skrw /* 78 */ { NULL, NULL }, 1678457ebc2Skrw /* 79 */ { NULL, NULL }, 1688457ebc2Skrw /* 80 */ { NULL, NULL }, 1698457ebc2Skrw /* 81 */ { NULL, NULL }, 1708457ebc2Skrw /* 82 */ { "relay-agent-information", "X" }, 1718457ebc2Skrw /* 83 */ { NULL, NULL }, 1728457ebc2Skrw /* 84 */ { NULL, NULL }, 1738457ebc2Skrw /* 85 */ { "nds-servers", "IA" }, 1748457ebc2Skrw /* 86 */ { "nds-tree-name", "X" }, 1758457ebc2Skrw /* 87 */ { "nds-context", "X" }, 1768457ebc2Skrw /* 88 */ { NULL, NULL }, 1778457ebc2Skrw /* 89 */ { NULL, NULL }, 1788457ebc2Skrw /* 90 */ { NULL, NULL }, 1798457ebc2Skrw /* 91 */ { NULL, NULL }, 1808457ebc2Skrw /* 92 */ { NULL, NULL }, 1818457ebc2Skrw /* 93 */ { NULL, NULL }, 1828457ebc2Skrw /* 94 */ { NULL, NULL }, 1838457ebc2Skrw /* 95 */ { NULL, NULL }, 1848457ebc2Skrw /* 96 */ { NULL, NULL }, 1858457ebc2Skrw /* 97 */ { NULL, NULL }, 1868457ebc2Skrw /* 98 */ { NULL, NULL }, 1878457ebc2Skrw /* 99 */ { NULL, NULL }, 1888457ebc2Skrw /* 100 */ { NULL, NULL }, 1898457ebc2Skrw /* 101 */ { NULL, NULL }, 1908457ebc2Skrw /* 102 */ { NULL, NULL }, 1918457ebc2Skrw /* 103 */ { NULL, NULL }, 1928457ebc2Skrw /* 104 */ { NULL, NULL }, 1938457ebc2Skrw /* 105 */ { NULL, NULL }, 1948457ebc2Skrw /* 106 */ { NULL, NULL }, 1958457ebc2Skrw /* 107 */ { NULL, NULL }, 1968457ebc2Skrw /* 108 */ { NULL, NULL }, 1978457ebc2Skrw /* 109 */ { NULL, NULL }, 1988457ebc2Skrw /* 110 */ { NULL, NULL }, 1998457ebc2Skrw /* 111 */ { NULL, NULL }, 2008457ebc2Skrw /* 112 */ { NULL, NULL }, 2018457ebc2Skrw /* 113 */ { NULL, NULL }, 2028457ebc2Skrw /* 114 */ { NULL, NULL }, 2038457ebc2Skrw /* 115 */ { NULL, NULL }, 2048457ebc2Skrw /* 116 */ { NULL, NULL }, 2058457ebc2Skrw /* 117 */ { NULL, NULL }, 2068457ebc2Skrw /* 118 */ { NULL, NULL }, 2078457ebc2Skrw /* 119 */ { "domain-search", "X" }, 2088457ebc2Skrw /* 120 */ { NULL, NULL }, 2098457ebc2Skrw /* 121 */ { "classless-static-routes", "CIA" }, 2108457ebc2Skrw /* 122 */ { NULL, NULL }, 2118457ebc2Skrw /* 123 */ { NULL, NULL }, 2128457ebc2Skrw /* 124 */ { NULL, NULL }, 2138457ebc2Skrw /* 125 */ { NULL, NULL }, 2148457ebc2Skrw /* 126 */ { NULL, NULL }, 2158457ebc2Skrw /* 127 */ { NULL, NULL }, 2168457ebc2Skrw /* 128 */ { NULL, NULL }, 2178457ebc2Skrw /* 129 */ { NULL, NULL }, 2188457ebc2Skrw /* 130 */ { NULL, NULL }, 2198457ebc2Skrw /* 131 */ { NULL, NULL }, 2208457ebc2Skrw /* 132 */ { NULL, NULL }, 2218457ebc2Skrw /* 133 */ { NULL, NULL }, 2228457ebc2Skrw /* 134 */ { NULL, NULL }, 2238457ebc2Skrw /* 135 */ { NULL, NULL }, 2248457ebc2Skrw /* 136 */ { NULL, NULL }, 2258457ebc2Skrw /* 137 */ { NULL, NULL }, 2268457ebc2Skrw /* 138 */ { NULL, NULL }, 2278457ebc2Skrw /* 139 */ { NULL, NULL }, 2288457ebc2Skrw /* 140 */ { NULL, NULL }, 2298457ebc2Skrw /* 141 */ { NULL, NULL }, 2308457ebc2Skrw /* 142 */ { NULL, NULL }, 2318457ebc2Skrw /* 143 */ { NULL, NULL }, 2328457ebc2Skrw /* 144 */ { "tftp-config-file", "t" }, 2338457ebc2Skrw /* 145 */ { NULL, NULL }, 2348457ebc2Skrw /* 146 */ { NULL, NULL }, 2358457ebc2Skrw /* 147 */ { NULL, NULL }, 2368457ebc2Skrw /* 148 */ { NULL, NULL }, 2378457ebc2Skrw /* 149 */ { NULL, NULL }, 2388457ebc2Skrw /* 150 */ { "voip-configuration-server", "IA" }, 2398457ebc2Skrw /* 151 */ { NULL, NULL }, 2408457ebc2Skrw /* 152 */ { NULL, NULL }, 2418457ebc2Skrw /* 153 */ { NULL, NULL }, 2428457ebc2Skrw /* 154 */ { NULL, NULL }, 2438457ebc2Skrw /* 155 */ { NULL, NULL }, 2448457ebc2Skrw /* 156 */ { NULL, NULL }, 2458457ebc2Skrw /* 157 */ { NULL, NULL }, 2468457ebc2Skrw /* 158 */ { NULL, NULL }, 2478457ebc2Skrw /* 159 */ { NULL, NULL }, 2488457ebc2Skrw /* 160 */ { NULL, NULL }, 2498457ebc2Skrw /* 161 */ { NULL, NULL }, 2508457ebc2Skrw /* 162 */ { NULL, NULL }, 2518457ebc2Skrw /* 163 */ { NULL, NULL }, 2528457ebc2Skrw /* 164 */ { NULL, NULL }, 2538457ebc2Skrw /* 165 */ { NULL, NULL }, 2548457ebc2Skrw /* 166 */ { NULL, NULL }, 2558457ebc2Skrw /* 167 */ { NULL, NULL }, 2568457ebc2Skrw /* 168 */ { NULL, NULL }, 2578457ebc2Skrw /* 169 */ { NULL, NULL }, 2588457ebc2Skrw /* 170 */ { NULL, NULL }, 2598457ebc2Skrw /* 171 */ { NULL, NULL }, 2608457ebc2Skrw /* 172 */ { NULL, NULL }, 2618457ebc2Skrw /* 173 */ { NULL, NULL }, 2628457ebc2Skrw /* 174 */ { NULL, NULL }, 2638457ebc2Skrw /* 175 */ { NULL, NULL }, 2648457ebc2Skrw /* 176 */ { NULL, NULL }, 2658457ebc2Skrw /* 177 */ { NULL, NULL }, 2668457ebc2Skrw /* 178 */ { NULL, NULL }, 2678457ebc2Skrw /* 179 */ { NULL, NULL }, 2688457ebc2Skrw /* 180 */ { NULL, NULL }, 2698457ebc2Skrw /* 181 */ { NULL, NULL }, 2708457ebc2Skrw /* 182 */ { NULL, NULL }, 2718457ebc2Skrw /* 183 */ { NULL, NULL }, 2728457ebc2Skrw /* 184 */ { NULL, NULL }, 2738457ebc2Skrw /* 185 */ { NULL, NULL }, 2748457ebc2Skrw /* 186 */ { NULL, NULL }, 2758457ebc2Skrw /* 187 */ { NULL, NULL }, 2768457ebc2Skrw /* 188 */ { NULL, NULL }, 2778457ebc2Skrw /* 189 */ { NULL, NULL }, 2788457ebc2Skrw /* 190 */ { NULL, NULL }, 2798457ebc2Skrw /* 191 */ { NULL, NULL }, 2808457ebc2Skrw /* 192 */ { NULL, NULL }, 2818457ebc2Skrw /* 193 */ { NULL, NULL }, 2828457ebc2Skrw /* 194 */ { NULL, NULL }, 2838457ebc2Skrw /* 195 */ { NULL, NULL }, 2848457ebc2Skrw /* 196 */ { NULL, NULL }, 2858457ebc2Skrw /* 197 */ { NULL, NULL }, 2868457ebc2Skrw /* 198 */ { NULL, NULL }, 2878457ebc2Skrw /* 199 */ { NULL, NULL }, 2888457ebc2Skrw /* 200 */ { NULL, NULL }, 2898457ebc2Skrw /* 201 */ { NULL, NULL }, 2908457ebc2Skrw /* 202 */ { NULL, NULL }, 2918457ebc2Skrw /* 203 */ { NULL, NULL }, 2928457ebc2Skrw /* 204 */ { NULL, NULL }, 2938457ebc2Skrw /* 205 */ { NULL, NULL }, 2948457ebc2Skrw /* 206 */ { NULL, NULL }, 2958457ebc2Skrw /* 207 */ { NULL, NULL }, 2968457ebc2Skrw /* 208 */ { NULL, NULL }, 2978457ebc2Skrw /* 209 */ { NULL, NULL }, 2988457ebc2Skrw /* 210 */ { NULL, NULL }, 2998457ebc2Skrw /* 211 */ { NULL, NULL }, 3008457ebc2Skrw /* 212 */ { NULL, NULL }, 3018457ebc2Skrw /* 213 */ { NULL, NULL }, 3028457ebc2Skrw /* 214 */ { NULL, NULL }, 3038457ebc2Skrw /* 215 */ { NULL, NULL }, 3048457ebc2Skrw /* 216 */ { NULL, NULL }, 3058457ebc2Skrw /* 217 */ { NULL, NULL }, 3068457ebc2Skrw /* 218 */ { NULL, NULL }, 3078457ebc2Skrw /* 219 */ { NULL, NULL }, 3088457ebc2Skrw /* 220 */ { NULL, NULL }, 3098457ebc2Skrw /* 221 */ { NULL, NULL }, 3108457ebc2Skrw /* 222 */ { NULL, NULL }, 3118457ebc2Skrw /* 223 */ { NULL, NULL }, 3128457ebc2Skrw /* 224 */ { NULL, NULL }, 3138457ebc2Skrw /* 225 */ { NULL, NULL }, 3148457ebc2Skrw /* 226 */ { NULL, NULL }, 3158457ebc2Skrw /* 227 */ { NULL, NULL }, 3168457ebc2Skrw /* 228 */ { NULL, NULL }, 3178457ebc2Skrw /* 229 */ { NULL, NULL }, 3188457ebc2Skrw /* 230 */ { NULL, NULL }, 3198457ebc2Skrw /* 231 */ { NULL, NULL }, 3208457ebc2Skrw /* 232 */ { NULL, NULL }, 3218457ebc2Skrw /* 233 */ { NULL, NULL }, 3228457ebc2Skrw /* 234 */ { NULL, NULL }, 3238457ebc2Skrw /* 235 */ { NULL, NULL }, 3248457ebc2Skrw /* 236 */ { NULL, NULL }, 3258457ebc2Skrw /* 237 */ { NULL, NULL }, 3268457ebc2Skrw /* 238 */ { NULL, NULL }, 3278457ebc2Skrw /* 239 */ { NULL, NULL }, 3288457ebc2Skrw /* 240 */ { NULL, NULL }, 3298457ebc2Skrw /* 241 */ { NULL, NULL }, 3308457ebc2Skrw /* 242 */ { NULL, NULL }, 3318457ebc2Skrw /* 243 */ { NULL, NULL }, 3328457ebc2Skrw /* 244 */ { NULL, NULL }, 3338457ebc2Skrw /* 245 */ { NULL, NULL }, 3348457ebc2Skrw /* 246 */ { NULL, NULL }, 3358457ebc2Skrw /* 247 */ { NULL, NULL }, 3368457ebc2Skrw /* 248 */ { NULL, NULL }, 3378457ebc2Skrw /* 249 */ { "classless-ms-static-routes", "CIA" }, 3388457ebc2Skrw /* 250 */ { NULL, NULL }, 3398457ebc2Skrw /* 251 */ { NULL, NULL }, 3408457ebc2Skrw /* 252 */ { "autoproxy-script", "t" }, 3418457ebc2Skrw /* 253 */ { NULL, NULL }, 3428457ebc2Skrw /* 254 */ { NULL, NULL }, 3438457ebc2Skrw /* 255 */ { "option-end", "e" }, 3448457ebc2Skrw }; 3458457ebc2Skrw 3468457ebc2Skrw char * 3478457ebc2Skrw code_to_name(int code) 3488457ebc2Skrw { 3498457ebc2Skrw static char unknown[11]; /* "option-NNN" */ 3508457ebc2Skrw int ret; 3518457ebc2Skrw 3528457ebc2Skrw if (code < 0 || code >= DHO_COUNT) 3538457ebc2Skrw return ""; 3548457ebc2Skrw 3558457ebc2Skrw if (dhcp_options[code].name != NULL) 3568457ebc2Skrw return dhcp_options[code].name; 3578457ebc2Skrw 3588457ebc2Skrw ret = snprintf(unknown, sizeof(unknown), "option-%d", code); 3598457ebc2Skrw if (ret == -1 || ret >= (int)sizeof(unknown)) 3608457ebc2Skrw return ""; 3618457ebc2Skrw 3628457ebc2Skrw return unknown; 3638457ebc2Skrw } 3648457ebc2Skrw 3658457ebc2Skrw int 3668457ebc2Skrw name_to_code(char *name) 3678457ebc2Skrw { 3688457ebc2Skrw char unknown[11]; /* "option-NNN" */ 3698457ebc2Skrw int code, ret; 3708457ebc2Skrw 3718457ebc2Skrw for (code = 1; code < DHO_END; code++) { 3728457ebc2Skrw if (dhcp_options[code].name == NULL) { 3738457ebc2Skrw ret = snprintf(unknown, sizeof(unknown), "option-%d", 3748457ebc2Skrw code); 3758457ebc2Skrw if (ret == -1 || ret >= (int)sizeof(unknown)) 3768457ebc2Skrw return DHO_END; 3778457ebc2Skrw if (strcasecmp(unknown, name) == 0) 3788457ebc2Skrw return code; 3798457ebc2Skrw } else if (strcasecmp(dhcp_options[code].name, name) == 0) { 3808457ebc2Skrw return code; 3818457ebc2Skrw } 3828457ebc2Skrw } 3838457ebc2Skrw 3848457ebc2Skrw return DHO_END; 3858457ebc2Skrw } 3868457ebc2Skrw 3878457ebc2Skrw char * 3888457ebc2Skrw code_to_format(int code) 3898457ebc2Skrw { 3908457ebc2Skrw if (code < 0 || code >= DHO_COUNT) 3918457ebc2Skrw return ""; 3928457ebc2Skrw 3938457ebc2Skrw if (dhcp_options[code].format == NULL) 3948457ebc2Skrw return "X"; 3958457ebc2Skrw 3968457ebc2Skrw return dhcp_options[code].format; 3978457ebc2Skrw } 3988457ebc2Skrw 3998457ebc2Skrw /* 400c714dadcShenning * Parse options out of the specified buffer, storing addresses of 40192018899Skrw * option values in options. Return 0 if errors, 1 if not. 402c714dadcShenning */ 40302e02bd5Skrw int 4044f062ee3Skrw parse_option_buffer(struct option_data *options, unsigned char *buffer, 4054f062ee3Skrw int length) 4069a2590e5Sderaadt { 407285f06efSderaadt unsigned char *s, *t, *end = buffer + length; 4088457ebc2Skrw char *name, *fmt; 409285f06efSderaadt int len, code; 4109a2590e5Sderaadt 4119a2590e5Sderaadt for (s = buffer; *s != DHO_END && s < end; ) { 4129a2590e5Sderaadt code = s[0]; 4139a2590e5Sderaadt 4149a2590e5Sderaadt /* Pad options don't have a length - just skip them. */ 4159a2590e5Sderaadt if (code == DHO_PAD) { 416f1e89499Shenning s++; 4179a2590e5Sderaadt continue; 4189a2590e5Sderaadt } 4199a2590e5Sderaadt 4208457ebc2Skrw name = code_to_name(code); 4218457ebc2Skrw fmt = code_to_format(code); 4228457ebc2Skrw 423c714dadcShenning /* 42499c003b1Skrw * All options other than DHO_PAD and DHO_END have a one-byte 42599c003b1Skrw * length field. It could be 0! Make sure that the length byte 42699c003b1Skrw * is present, and all the data is available. 427c714dadcShenning */ 42899c003b1Skrw if (s + 1 < end) { 4299a2590e5Sderaadt len = s[1]; 43099c003b1Skrw if (s + 1 + len < end) { 43199c003b1Skrw ; /* option data is all there. */ 43299c003b1Skrw } else { 433385a6373Skrw log_warnx("option %s (%d) larger than buffer.", 4348457ebc2Skrw name, len); 43551a35423Skrw return 0; 4369a2590e5Sderaadt } 43799c003b1Skrw } else { 4388457ebc2Skrw log_warnx("option %s has no length field.", name); 43951a35423Skrw return 0; 44099c003b1Skrw } 441df453039Skrw 442df453039Skrw /* 443df453039Skrw * Strip trailing NULs from ascii ('t') options. They 444df453039Skrw * will be treated as DHO_PAD options. i.e. ignored. RFC 2132 445df453039Skrw * says "Options containing NVT ASCII data SHOULD NOT include 446df453039Skrw * a trailing NULL; however, the receiver of such options 447df453039Skrw * MUST be prepared to delete trailing nulls if they exist." 448df453039Skrw */ 4498457ebc2Skrw if (fmt[0] == 't') { 45099c003b1Skrw while (len > 0 && s[len + 1] == '\0') 45199c003b1Skrw len--; 452df453039Skrw } 453df453039Skrw 454c714dadcShenning /* 455c714dadcShenning * If we haven't seen this option before, just make 456c714dadcShenning * space for it and copy it there. 457c714dadcShenning */ 458561b23c2Skrw if (options[code].data == NULL) { 459561b23c2Skrw t = calloc(1, len + 1); 460561b23c2Skrw if (t == NULL) 461385a6373Skrw fatalx("Can't allocate storage for option %s.", 4628457ebc2Skrw name); 463c714dadcShenning /* 464c714dadcShenning * Copy and NUL-terminate the option (in case 465cff08477Sstevesk * it's an ASCII string). 466c714dadcShenning */ 4679a2590e5Sderaadt memcpy(t, &s[2], len); 4689a2590e5Sderaadt t[len] = 0; 4694f062ee3Skrw options[code].len = len; 4704f062ee3Skrw options[code].data = t; 4719a2590e5Sderaadt } else { 472c714dadcShenning /* 473c714dadcShenning * If it's a repeat, concatenate it to whatever 47492018899Skrw * we last saw. 475c714dadcShenning */ 4764f062ee3Skrw t = calloc(1, len + options[code].len + 1); 477561b23c2Skrw if (t == NULL) 478385a6373Skrw fatalx("Can't expand storage for option %s.", 4798457ebc2Skrw name); 4804f062ee3Skrw memcpy(t, options[code].data, options[code].len); 4814f062ee3Skrw memcpy(t + options[code].len, &s[2], len); 4824f062ee3Skrw options[code].len += len; 4834f062ee3Skrw t[options[code].len] = 0; 4844f062ee3Skrw free(options[code].data); 4854f062ee3Skrw options[code].data = t; 4869a2590e5Sderaadt } 4879a2590e5Sderaadt s += len + 2; 4889a2590e5Sderaadt } 48902e02bd5Skrw 49051a35423Skrw return 1; 4919a2590e5Sderaadt } 4929a2590e5Sderaadt 493c714dadcShenning /* 494b414edd1Skrw * Pack as many options as fit in buflen bytes of buf. Return the 49596978980Skrw * offset of the start of the last option copied. A caller can check 49696978980Skrw * to see if it's DHO_END to decide if all the options were copied. 497c714dadcShenning */ 498c714dadcShenning int 499b414edd1Skrw pack_options(unsigned char *buf, int buflen, struct option_data *options) 5009a2590e5Sderaadt { 50196978980Skrw int ix, incr, length, bufix, code, lastopt = -1; 5029a2590e5Sderaadt 503736b0ed2Skrw memset(buf, 0, buflen); 5049a2590e5Sderaadt 50596978980Skrw memcpy(buf, DHCP_OPTIONS_COOKIE, 4); 5066fe46e93Skrw if (options[DHO_DHCP_MESSAGE_TYPE].data != NULL) { 507d6a67f0fSkrw memcpy(&buf[4], DHCP_OPTIONS_MESSAGE_TYPE, 3); 508d6a67f0fSkrw buf[6] = options[DHO_DHCP_MESSAGE_TYPE].data[0]; 509d6a67f0fSkrw bufix = 7; 510d6a67f0fSkrw } else 51196978980Skrw bufix = 4; 5129a2590e5Sderaadt 51396978980Skrw for (code = DHO_SUBNET_MASK; code < DHO_END; code++) { 514561b23c2Skrw if (options[code].data == NULL || 515561b23c2Skrw code == DHO_DHCP_MESSAGE_TYPE) 5169a2590e5Sderaadt continue; 5179a2590e5Sderaadt 518d7d9bbf5Skrw length = options[code].len; 51996978980Skrw if (bufix + length + 2*((length+254)/255) >= buflen) 52051a35423Skrw return lastopt; 5219a2590e5Sderaadt 52296978980Skrw lastopt = bufix; 5239a2590e5Sderaadt ix = 0; 5249a2590e5Sderaadt 5259a2590e5Sderaadt while (length) { 52696978980Skrw incr = length > 255 ? 255 : length; 5279a2590e5Sderaadt 52896978980Skrw buf[bufix++] = code; 52996978980Skrw buf[bufix++] = incr; 53096978980Skrw memcpy(buf + bufix, options[code].data + ix, incr); 5319a2590e5Sderaadt 5329a2590e5Sderaadt length -= incr; 5339a2590e5Sderaadt ix += incr; 5346fc9f4f6Skrw bufix += incr; 5359a2590e5Sderaadt } 5369a2590e5Sderaadt } 53796978980Skrw 53896978980Skrw if (bufix < buflen) { 53996978980Skrw buf[bufix] = DHO_END; 54096978980Skrw lastopt = bufix; 54196978980Skrw } 54296978980Skrw 54351a35423Skrw return lastopt; 5449a2590e5Sderaadt } 5459a2590e5Sderaadt 546c714dadcShenning /* 547482123e8Skrw * Use vis() to encode characters of src and append encoded characters onto 548482123e8Skrw * dst. Also encode ", ', $, ` and \, to ensure resulting strings can be 549482123e8Skrw * represented as '"' delimited strings and safely passed to scripts. Surround 550482123e8Skrw * result with double quotes if emit_punct is true. 551482123e8Skrw */ 552bee06f07Skrw char * 553bee06f07Skrw pretty_print_string(unsigned char *src, size_t srclen, int emit_punct) 554482123e8Skrw { 555bee06f07Skrw static char string[8196]; 556482123e8Skrw char visbuf[5]; 557482123e8Skrw unsigned char *origsrc = src; 558bee06f07Skrw size_t rslt = 0; 559482123e8Skrw 560bee06f07Skrw memset(string, 0, sizeof(string)); 561bee06f07Skrw 5626fe46e93Skrw if (emit_punct != 0) 563bee06f07Skrw rslt = strlcat(string, "\"", sizeof(string)); 564482123e8Skrw 565482123e8Skrw for (; src < origsrc + srclen; src++) { 566482123e8Skrw if (*src && strchr("\"'$`\\", *src)) 567642cc348Skrw vis(visbuf, *src, VIS_ALL | VIS_OCTAL, *src+1); 568642cc348Skrw else 569482123e8Skrw vis(visbuf, *src, VIS_OCTAL, *src+1); 570bee06f07Skrw rslt = strlcat(string, visbuf, sizeof(string)); 571482123e8Skrw } 572482123e8Skrw 5736fe46e93Skrw if (emit_punct != 0) 574bee06f07Skrw rslt = strlcat(string, "\"", sizeof(string)); 575bee06f07Skrw 576bee06f07Skrw if (rslt >= sizeof(string)) 57751a35423Skrw return NULL; 578bee06f07Skrw 57951a35423Skrw return string; 580482123e8Skrw } 581482123e8Skrw 582482123e8Skrw /* 5835714f486Skrw * Must special case *_CLASSLESS_* route options due to the variable size 5845714f486Skrw * of the CIDR element in its CIA format. 5855714f486Skrw */ 586*5c6453b8Skrw void 587*5c6453b8Skrw pretty_print_classless_routes(unsigned char *src, size_t srclen, 588*5c6453b8Skrw unsigned char *buf, size_t buflen) 5895714f486Skrw { 590da2eb076Skrw char bitsbuf[5]; /* to hold "/nn " */ 591da2eb076Skrw struct in_addr net, gateway; 592e0a6d2f1Skrw unsigned int bytes; 593e0a6d2f1Skrw int bits, rslt; 5945714f486Skrw 595da2eb076Skrw while (srclen) { 5965714f486Skrw bits = *src; 5975714f486Skrw src++; 5985714f486Skrw srclen--; 599da2eb076Skrw 6005714f486Skrw bytes = (bits + 7) / 8; 601da2eb076Skrw if (srclen < (bytes + sizeof(gateway.s_addr)) || 602da2eb076Skrw bytes > sizeof(net.s_addr)) 603*5c6453b8Skrw goto toobig; 604da2eb076Skrw rslt = snprintf(bitsbuf, sizeof(bitsbuf), "/%d ", bits); 6051be0b429Skrw if (rslt == -1 || (unsigned int)rslt >= sizeof(bitsbuf)) 606*5c6453b8Skrw goto toobig; 607da2eb076Skrw 608da2eb076Skrw memset(&net, 0, sizeof(net)); 609da2eb076Skrw memcpy(&net.s_addr, src, bytes); 6105714f486Skrw src += bytes; 6115714f486Skrw srclen -= bytes; 612da2eb076Skrw 6135714f486Skrw memcpy(&gateway.s_addr, src, sizeof(gateway.s_addr)); 6145714f486Skrw src += sizeof(gateway.s_addr); 6155714f486Skrw srclen -= sizeof(gateway.s_addr); 616da2eb076Skrw 617*5c6453b8Skrw if (strlen(buf) > 0) 618*5c6453b8Skrw strlcat(buf, ", ", buflen); 619*5c6453b8Skrw strlcat(buf, inet_ntoa(net), buflen); 620*5c6453b8Skrw strlcat(buf, bitsbuf, buflen); 621*5c6453b8Skrw if (strlcat(buf, inet_ntoa(gateway), buflen) >= buflen) 622*5c6453b8Skrw goto toobig; 6235714f486Skrw } 6245714f486Skrw 625*5c6453b8Skrw return; 626*5c6453b8Skrw 627*5c6453b8Skrw toobig: 628*5c6453b8Skrw memset(buf, 0, buflen); 6295714f486Skrw } 6305714f486Skrw 631968fe952Skrw int 632968fe952Skrw expand_search_domain_name(unsigned char *src, size_t srclen, int *offset, 633968fe952Skrw unsigned char *domain_search) 634968fe952Skrw { 6355d0bc970Skrw char *cursor; 636e0a6d2f1Skrw unsigned int i; 637e0a6d2f1Skrw int domain_name_len, label_len, pointer, pointed_len; 638968fe952Skrw 639968fe952Skrw cursor = domain_search + strlen(domain_search); 640968fe952Skrw domain_name_len = 0; 641968fe952Skrw 642968fe952Skrw i = *offset; 643968fe952Skrw while (i <= srclen) { 644968fe952Skrw label_len = src[i]; 645968fe952Skrw if (label_len == 0) { 646968fe952Skrw /* 647968fe952Skrw * A zero-length label marks the end of this 648968fe952Skrw * domain name. 649968fe952Skrw */ 650968fe952Skrw *offset = i + 1; 65151a35423Skrw return domain_name_len; 6526fe46e93Skrw } else if ((label_len & 0xC0) != 0) { 653968fe952Skrw /* This is a pointer to another list of labels. */ 654968fe952Skrw if (i + 1 >= srclen) { 655968fe952Skrw /* The pointer is truncated. */ 656385a6373Skrw log_warnx("Truncated pointer in DHCP Domain " 657968fe952Skrw "Search option."); 65851a35423Skrw return -1; 659968fe952Skrw } 660968fe952Skrw 661968fe952Skrw pointer = ((label_len & ~(0xC0)) << 8) + src[i + 1]; 662968fe952Skrw if (pointer >= *offset) { 663968fe952Skrw /* 664968fe952Skrw * The pointer must indicates a prior 665968fe952Skrw * occurance. 666968fe952Skrw */ 667385a6373Skrw log_warnx("Invalid forward pointer in DHCP " 668968fe952Skrw "Domain Search option compression."); 66951a35423Skrw return -1; 670968fe952Skrw } 671968fe952Skrw 672968fe952Skrw pointed_len = expand_search_domain_name(src, srclen, 673968fe952Skrw &pointer, domain_search); 674968fe952Skrw domain_name_len += pointed_len; 675968fe952Skrw 676968fe952Skrw *offset = i + 2; 67751a35423Skrw return domain_name_len; 678968fe952Skrw } 679968fe952Skrw if (i + label_len + 1 > srclen) { 680385a6373Skrw log_warnx("Truncated label in DHCP Domain Search " 681968fe952Skrw "option."); 68251a35423Skrw return -1; 683968fe952Skrw } 684968fe952Skrw /* 685968fe952Skrw * Update the domain name length with the length of the 686968fe952Skrw * current label, plus a trailing dot ('.'). 687968fe952Skrw */ 688968fe952Skrw domain_name_len += label_len + 1; 689968fe952Skrw 690968fe952Skrw if (strlen(domain_search) + domain_name_len >= 691968fe952Skrw DHCP_DOMAIN_SEARCH_LEN) { 692385a6373Skrw log_warnx("Domain search list too long."); 69351a35423Skrw return -1; 694968fe952Skrw } 695968fe952Skrw 696968fe952Skrw /* Copy the label found. */ 697968fe952Skrw memcpy(cursor, src + i + 1, label_len); 698968fe952Skrw cursor[label_len] = '.'; 699968fe952Skrw 700968fe952Skrw /* Move cursor. */ 701968fe952Skrw i += label_len + 1; 702968fe952Skrw cursor += label_len + 1; 703968fe952Skrw } 704968fe952Skrw 705385a6373Skrw log_warnx("Truncated DHCP Domain Search option."); 706968fe952Skrw 70751a35423Skrw return -1; 708968fe952Skrw } 709968fe952Skrw 710968fe952Skrw /* 711968fe952Skrw * Must special case DHO_DOMAIN_SEARCH because it is encoded as described 712968fe952Skrw * in RFC 1035 section 4.1.4. 713968fe952Skrw */ 7144d36d16aSkrw char * 7154d36d16aSkrw pretty_print_domain_search(unsigned char *src, size_t srclen) 716968fe952Skrw { 7174d36d16aSkrw static char domain_search[DHCP_DOMAIN_SEARCH_LEN]; 7185d0bc970Skrw unsigned char *cursor; 719e0a6d2f1Skrw unsigned int offset; 720e0a6d2f1Skrw int len, expanded_len, domains; 721968fe952Skrw 7224d36d16aSkrw memset(domain_search, 0, sizeof(domain_search)); 723968fe952Skrw 724968fe952Skrw /* Compute expanded length. */ 725968fe952Skrw expanded_len = len = 0; 726968fe952Skrw domains = 0; 727968fe952Skrw offset = 0; 728968fe952Skrw while (offset < srclen) { 729968fe952Skrw cursor = domain_search + strlen(domain_search); 730968fe952Skrw if (domain_search[0]) { 731968fe952Skrw *cursor = ' '; 732968fe952Skrw expanded_len++; 733968fe952Skrw } 734968fe952Skrw len = expand_search_domain_name(src, srclen, &offset, 735968fe952Skrw domain_search); 7364d36d16aSkrw if (len == -1) 73751a35423Skrw return NULL; 738968fe952Skrw domains++; 739968fe952Skrw expanded_len += len; 7404d36d16aSkrw if (domains > DHCP_DOMAIN_SEARCH_CNT) 74151a35423Skrw return NULL; 742968fe952Skrw } 743968fe952Skrw 74451a35423Skrw return domain_search; 745968fe952Skrw } 746968fe952Skrw 7475714f486Skrw /* 748c714dadcShenning * Format the specified option so that a human can easily read it. 749c714dadcShenning */ 750c714dadcShenning char * 751acf4c28bSkrw pretty_print_option(unsigned int code, struct option_data *option, 752acf4c28bSkrw int emit_punct) 7539a2590e5Sderaadt { 754bee06f07Skrw static char optbuf[8192]; /* XXX */ 755024801d2Skrw char fmtbuf[32]; 756024801d2Skrw struct in_addr foo; 757acf4c28bSkrw unsigned char *data = option->data; 7589a2590e5Sderaadt unsigned char *dp = data; 7598457ebc2Skrw char *op = optbuf, *buf, *name, *fmt; 760024801d2Skrw int hunksize = 0, numhunk = -1, numelem = 0; 761024801d2Skrw int i, j, k, opleft = sizeof(optbuf); 762acf4c28bSkrw int len = option->len; 763f3a8c5fdSkrw int opcount = 0; 764bce09e58Skrw int32_t int32val; 765024801d2Skrw uint32_t uint32val; 766024801d2Skrw uint16_t uint16val; 767024801d2Skrw char comma; 7689a2590e5Sderaadt 7692f18daabSkrw memset(optbuf, 0, sizeof(optbuf)); 7702f18daabSkrw 7719a2590e5Sderaadt /* Code should be between 0 and 255. */ 7722f18daabSkrw if (code > 255) { 773385a6373Skrw log_warnx("pretty_print_option: bad code %d", code); 7742f18daabSkrw goto done; 7752f18daabSkrw } 7769a2590e5Sderaadt 7776fe46e93Skrw if (emit_punct != 0) 7789a2590e5Sderaadt comma = ','; 7799a2590e5Sderaadt else 7809a2590e5Sderaadt comma = ' '; 7819a2590e5Sderaadt 7825714f486Skrw /* Handle the princess class options with weirdo formats. */ 7835714f486Skrw switch (code) { 7845714f486Skrw case DHO_CLASSLESS_STATIC_ROUTES: 7855714f486Skrw case DHO_CLASSLESS_MS_STATIC_ROUTES: 786*5c6453b8Skrw pretty_print_classless_routes(dp, len, optbuf, 787*5c6453b8Skrw sizeof(optbuf)); 7885714f486Skrw goto done; 7895714f486Skrw default: 7905714f486Skrw break; 7915714f486Skrw } 7925714f486Skrw 7938457ebc2Skrw name = code_to_name(code); 7948457ebc2Skrw fmt = code_to_format(code); 7958457ebc2Skrw 7969a2590e5Sderaadt /* Figure out the size of the data. */ 7978457ebc2Skrw for (i = 0; fmt[i]; i++) { 7986fe46e93Skrw if (numhunk == 0) { 799833082e5Skrw log_warnx("%s: Excess information in format string: " 8008457ebc2Skrw "%s", name, &fmt[i]); 8012f18daabSkrw goto done; 8029a2590e5Sderaadt } 8039a2590e5Sderaadt numelem++; 8048457ebc2Skrw fmtbuf[i] = fmt[i]; 8058457ebc2Skrw switch (fmt[i]) { 8069a2590e5Sderaadt case 'A': 8079a2590e5Sderaadt --numelem; 8089a2590e5Sderaadt fmtbuf[i] = 0; 8099a2590e5Sderaadt numhunk = 0; 81029432cd9Sphessler if (hunksize == 0) { 811385a6373Skrw log_warnx("%s: no size indicator before A" 8128457ebc2Skrw " in format string: %s", name, fmt); 8132f18daabSkrw goto done; 81429432cd9Sphessler } 8159a2590e5Sderaadt break; 8169a2590e5Sderaadt case 'X': 817c714dadcShenning for (k = 0; k < len; k++) 8186fe46e93Skrw if (isascii(data[k]) == 0 || 8196fe46e93Skrw isprint(data[k]) == 0) 8209a2590e5Sderaadt break; 821b54c879eShenning if (k == len) { 8229a2590e5Sderaadt fmtbuf[i] = 't'; 8239a2590e5Sderaadt numhunk = -2; 8249a2590e5Sderaadt } else { 8259a2590e5Sderaadt hunksize++; 8269a2590e5Sderaadt comma = ':'; 8279a2590e5Sderaadt numhunk = 0; 8289a2590e5Sderaadt } 8299a2590e5Sderaadt fmtbuf[i + 1] = 0; 8309a2590e5Sderaadt break; 8319a2590e5Sderaadt case 't': 8329a2590e5Sderaadt fmtbuf[i + 1] = 0; 8339a2590e5Sderaadt numhunk = -2; 8349a2590e5Sderaadt break; 8359a2590e5Sderaadt case 'I': 8369a2590e5Sderaadt case 'l': 8379a2590e5Sderaadt case 'L': 8389a2590e5Sderaadt hunksize += 4; 8399a2590e5Sderaadt break; 8409a2590e5Sderaadt case 'S': 8419a2590e5Sderaadt hunksize += 2; 8429a2590e5Sderaadt break; 8439a2590e5Sderaadt case 'B': 8449a2590e5Sderaadt case 'f': 8459a2590e5Sderaadt hunksize++; 8469a2590e5Sderaadt break; 8479a2590e5Sderaadt case 'e': 8489a2590e5Sderaadt break; 8499a2590e5Sderaadt default: 8508457ebc2Skrw log_warnx("%s: garbage in format string: %s", name, 8518457ebc2Skrw &fmt[i]); 8522f18daabSkrw goto done; 8539a2590e5Sderaadt } 8549a2590e5Sderaadt } 8559a2590e5Sderaadt 856d22f105fSkrw /* Check for too few bytes. */ 8579a2590e5Sderaadt if (hunksize > len) { 8588457ebc2Skrw log_warnx("%s: expecting at least %d bytes; got %d", name, 8598457ebc2Skrw hunksize, len); 8602f18daabSkrw goto done; 8619a2590e5Sderaadt } 862d22f105fSkrw /* Check for too many bytes. */ 8632f18daabSkrw if (numhunk == -1 && hunksize < len) { 8648457ebc2Skrw log_warnx("%s: expecting only %d bytes: got %d", name, 8658457ebc2Skrw hunksize, len); 8662f18daabSkrw goto done; 8672f18daabSkrw } 8689a2590e5Sderaadt 8699a2590e5Sderaadt /* If this is an array, compute its size. */ 8706fe46e93Skrw if (numhunk == 0) 8719a2590e5Sderaadt numhunk = len / hunksize; 8729a2590e5Sderaadt /* See if we got an exact number of hunks. */ 8732f18daabSkrw if (numhunk > 0 && numhunk * hunksize != len) { 8748457ebc2Skrw log_warnx("%s: expecting %d bytes: got %d", name, 8758457ebc2Skrw numhunk * hunksize, len); 8762f18daabSkrw goto done; 8772f18daabSkrw } 8789a2590e5Sderaadt 8799a2590e5Sderaadt /* A one-hunk array prints the same as a single hunk. */ 8809a2590e5Sderaadt if (numhunk < 0) 8819a2590e5Sderaadt numhunk = 1; 8829a2590e5Sderaadt 8839a2590e5Sderaadt /* Cycle through the array (or hunk) printing the data. */ 8849a2590e5Sderaadt for (i = 0; i < numhunk; i++) { 8859a2590e5Sderaadt for (j = 0; j < numelem; j++) { 8869a2590e5Sderaadt switch (fmtbuf[j]) { 8879a2590e5Sderaadt case 't': 888bee06f07Skrw buf = pretty_print_string(dp, len, emit_punct); 889bee06f07Skrw if (buf == NULL) 890bee06f07Skrw opcount = -1; 891bee06f07Skrw else 892bee06f07Skrw opcount = strlcat(op, buf, opleft); 8939a2590e5Sderaadt break; 8949a2590e5Sderaadt case 'I': 895e95625edSkrw memcpy(&foo.s_addr, dp, sizeof(foo.s_addr)); 896f3a8c5fdSkrw opcount = snprintf(op, opleft, "%s", 897f3a8c5fdSkrw inet_ntoa(foo)); 898e95625edSkrw dp += sizeof(foo.s_addr); 8999a2590e5Sderaadt break; 9009a2590e5Sderaadt case 'l': 901bce09e58Skrw memcpy(&int32val, dp, sizeof(int32val)); 902bce09e58Skrw opcount = snprintf(op, opleft, "%d", 903bce09e58Skrw ntohl(int32val)); 904bce09e58Skrw dp += sizeof(int32val); 9059a2590e5Sderaadt break; 9069a2590e5Sderaadt case 'L': 907bce09e58Skrw memcpy(&uint32val, dp, sizeof(uint32val)); 908bce09e58Skrw opcount = snprintf(op, opleft, "%u", 909bce09e58Skrw ntohl(uint32val)); 910bce09e58Skrw dp += sizeof(uint32val); 9119a2590e5Sderaadt break; 9129a2590e5Sderaadt case 'S': 913bce09e58Skrw memcpy(&uint16val, dp, sizeof(uint16val)); 914bce09e58Skrw opcount = snprintf(op, opleft, "%hu", 915bce09e58Skrw ntohs(uint16val)); 916bce09e58Skrw dp += sizeof(uint16val); 9179a2590e5Sderaadt break; 9189a2590e5Sderaadt case 'B': 919221bd6c0Skrw opcount = snprintf(op, opleft, "%u", *dp); 920de3ca9dbSkrw dp++; 9219a2590e5Sderaadt break; 922920d03efSkrw case 'X': 923de3ca9dbSkrw opcount = snprintf(op, opleft, "%x", *dp); 924de3ca9dbSkrw dp++; 9259a2590e5Sderaadt break; 9269a2590e5Sderaadt case 'f': 927f3a8c5fdSkrw opcount = snprintf(op, opleft, "%s", 928f3a8c5fdSkrw *dp ? "true" : "false"); 929de3ca9dbSkrw dp++; 9309a2590e5Sderaadt break; 9319a2590e5Sderaadt default: 932833082e5Skrw log_warnx("Unexpected format code %c", 933833082e5Skrw fmtbuf[j]); 9349a2590e5Sderaadt goto toobig; 935f3a8c5fdSkrw } 936f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 937f3a8c5fdSkrw goto toobig; 938f3a8c5fdSkrw opleft -= opcount; 939f3a8c5fdSkrw op += opcount; 9409a2590e5Sderaadt if (j + 1 < numelem && comma != ':') { 941f3a8c5fdSkrw opcount = snprintf(op, opleft, " "); 942f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 943f3a8c5fdSkrw goto toobig; 944f3a8c5fdSkrw opleft -= opcount; 945f3a8c5fdSkrw op += opcount; 9469a2590e5Sderaadt } 9479a2590e5Sderaadt } 9489a2590e5Sderaadt if (i + 1 < numhunk) { 949f3a8c5fdSkrw opcount = snprintf(op, opleft, "%c", comma); 950f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 9519a2590e5Sderaadt goto toobig; 952f3a8c5fdSkrw opleft -= opcount; 953f3a8c5fdSkrw op += opcount; 954f3a8c5fdSkrw } 9559a2590e5Sderaadt } 9562f18daabSkrw 9572f18daabSkrw done: 95851a35423Skrw return optbuf; 9592f18daabSkrw 9609a2590e5Sderaadt toobig: 9612f18daabSkrw memset(optbuf, 0, sizeof(optbuf)); 96251a35423Skrw return optbuf; 9639a2590e5Sderaadt } 9649a2590e5Sderaadt 965b414edd1Skrw struct option_data * 966b414edd1Skrw unpack_options(struct dhcp_packet *packet) 9679a2590e5Sderaadt { 968cb26da20Skrw static struct option_data options[DHO_COUNT]; 969b414edd1Skrw int i; 9709a2590e5Sderaadt 971cb26da20Skrw for (i = 0; i < DHO_COUNT; i++) { 972b414edd1Skrw free(options[i].data); 973b414edd1Skrw options[i].data = NULL; 974b414edd1Skrw options[i].len = 0; 975b414edd1Skrw } 97602e02bd5Skrw 97702e02bd5Skrw if (memcmp(&packet->options, DHCP_OPTIONS_COOKIE, 4) == 0) { 97802e02bd5Skrw /* Parse the BOOTP/DHCP options field. */ 979b414edd1Skrw parse_option_buffer(options, &packet->options[4], 980b414edd1Skrw sizeof(packet->options) - 4); 98102e02bd5Skrw 982b414edd1Skrw /* DHCP packets can also use overload areas for options. */ 9836fe46e93Skrw if (options[DHO_DHCP_MESSAGE_TYPE].data != NULL && 9846fe46e93Skrw options[DHO_DHCP_OPTION_OVERLOAD].data != NULL) { 9856fe46e93Skrw if ((options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1) != 0) 986b414edd1Skrw parse_option_buffer(options, 98702e02bd5Skrw (unsigned char *)packet->file, 98802e02bd5Skrw sizeof(packet->file)); 9896fe46e93Skrw if ((options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2) != 0) 990b414edd1Skrw parse_option_buffer(options, 99102e02bd5Skrw (unsigned char *)packet->sname, 99202e02bd5Skrw sizeof(packet->sname)); 99302e02bd5Skrw } 99402e02bd5Skrw } 99502e02bd5Skrw 996b414edd1Skrw return options; 9979a2590e5Sderaadt } 998