1*ef234d22Skrw /* $OpenBSD: options.c,v 1.111 2018/07/22 08:43:01 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 { 407373f0df1Skrw unsigned char *s, *t, *end; 4088457ebc2Skrw char *name, *fmt; 409285f06efSderaadt int len, code; 4109a2590e5Sderaadt 411373f0df1Skrw s = buffer; 412373f0df1Skrw end = s + length; 413373f0df1Skrw while (s < end) { 4149a2590e5Sderaadt code = s[0]; 4159a2590e5Sderaadt 416373f0df1Skrw /* End options terminate processing. */ 417373f0df1Skrw if (code == DHO_END) 418373f0df1Skrw break; 419373f0df1Skrw 4209a2590e5Sderaadt /* Pad options don't have a length - just skip them. */ 4219a2590e5Sderaadt if (code == DHO_PAD) { 422f1e89499Shenning s++; 4239a2590e5Sderaadt continue; 4249a2590e5Sderaadt } 4259a2590e5Sderaadt 4268457ebc2Skrw name = code_to_name(code); 4278457ebc2Skrw fmt = code_to_format(code); 4288457ebc2Skrw 429c714dadcShenning /* 43099c003b1Skrw * All options other than DHO_PAD and DHO_END have a one-byte 43199c003b1Skrw * length field. It could be 0! Make sure that the length byte 43299c003b1Skrw * is present, and all the data is available. 433c714dadcShenning */ 43499c003b1Skrw if (s + 1 < end) { 4359a2590e5Sderaadt len = s[1]; 43699c003b1Skrw if (s + 1 + len < end) { 43799c003b1Skrw ; /* option data is all there. */ 43899c003b1Skrw } else { 439b53f3a4dSkrw log_warnx("%s: option %s (%d) larger than " 440b53f3a4dSkrw "buffer", log_procname, name, len); 44151a35423Skrw return 0; 4429a2590e5Sderaadt } 44399c003b1Skrw } else { 444b53f3a4dSkrw log_warnx("%s: option %s has no length field", 445b53f3a4dSkrw log_procname, name); 44651a35423Skrw return 0; 44799c003b1Skrw } 448df453039Skrw 449df453039Skrw /* 450df453039Skrw * Strip trailing NULs from ascii ('t') options. They 451df453039Skrw * will be treated as DHO_PAD options. i.e. ignored. RFC 2132 452df453039Skrw * says "Options containing NVT ASCII data SHOULD NOT include 453df453039Skrw * a trailing NULL; however, the receiver of such options 454df453039Skrw * MUST be prepared to delete trailing nulls if they exist." 455df453039Skrw */ 4568457ebc2Skrw if (fmt[0] == 't') { 45799c003b1Skrw while (len > 0 && s[len + 1] == '\0') 45899c003b1Skrw len--; 459df453039Skrw } 460df453039Skrw 461c714dadcShenning /* 462c714dadcShenning * If we haven't seen this option before, just make 463c714dadcShenning * space for it and copy it there. 464c714dadcShenning */ 465561b23c2Skrw if (options[code].data == NULL) { 466561b23c2Skrw t = calloc(1, len + 1); 467561b23c2Skrw if (t == NULL) 46840c65bfbSkrw fatal("option %s", name); 469c714dadcShenning /* 470c714dadcShenning * Copy and NUL-terminate the option (in case 471cff08477Sstevesk * it's an ASCII string). 472c714dadcShenning */ 4739a2590e5Sderaadt memcpy(t, &s[2], len); 4749a2590e5Sderaadt t[len] = 0; 4754f062ee3Skrw options[code].len = len; 4764f062ee3Skrw options[code].data = t; 4779a2590e5Sderaadt } else { 478c714dadcShenning /* 479c714dadcShenning * If it's a repeat, concatenate it to whatever 48092018899Skrw * we last saw. 481c714dadcShenning */ 4824f062ee3Skrw t = calloc(1, len + options[code].len + 1); 483561b23c2Skrw if (t == NULL) 48440c65bfbSkrw fatal("option %s concat", name); 4854f062ee3Skrw memcpy(t, options[code].data, options[code].len); 4864f062ee3Skrw memcpy(t + options[code].len, &s[2], len); 4874f062ee3Skrw options[code].len += len; 4884f062ee3Skrw t[options[code].len] = 0; 4894f062ee3Skrw free(options[code].data); 4904f062ee3Skrw options[code].data = t; 4919a2590e5Sderaadt } 492*ef234d22Skrw s += s[1] + 2; 4939a2590e5Sderaadt } 49402e02bd5Skrw 49551a35423Skrw return 1; 4969a2590e5Sderaadt } 4979a2590e5Sderaadt 498c714dadcShenning /* 499b414edd1Skrw * Pack as many options as fit in buflen bytes of buf. Return the 50096978980Skrw * offset of the start of the last option copied. A caller can check 50196978980Skrw * to see if it's DHO_END to decide if all the options were copied. 502c714dadcShenning */ 503c714dadcShenning int 504b414edd1Skrw pack_options(unsigned char *buf, int buflen, struct option_data *options) 5059a2590e5Sderaadt { 50696978980Skrw int ix, incr, length, bufix, code, lastopt = -1; 5079a2590e5Sderaadt 508736b0ed2Skrw memset(buf, 0, buflen); 5099a2590e5Sderaadt 51096978980Skrw memcpy(buf, DHCP_OPTIONS_COOKIE, 4); 5116fe46e93Skrw if (options[DHO_DHCP_MESSAGE_TYPE].data != NULL) { 512d6a67f0fSkrw memcpy(&buf[4], DHCP_OPTIONS_MESSAGE_TYPE, 3); 513d6a67f0fSkrw buf[6] = options[DHO_DHCP_MESSAGE_TYPE].data[0]; 514d6a67f0fSkrw bufix = 7; 515d6a67f0fSkrw } else 51696978980Skrw bufix = 4; 5179a2590e5Sderaadt 51896978980Skrw for (code = DHO_SUBNET_MASK; code < DHO_END; code++) { 519561b23c2Skrw if (options[code].data == NULL || 520561b23c2Skrw code == DHO_DHCP_MESSAGE_TYPE) 5219a2590e5Sderaadt continue; 5229a2590e5Sderaadt 523d7d9bbf5Skrw length = options[code].len; 52496978980Skrw if (bufix + length + 2*((length+254)/255) >= buflen) 52551a35423Skrw return lastopt; 5269a2590e5Sderaadt 52796978980Skrw lastopt = bufix; 5289a2590e5Sderaadt ix = 0; 5299a2590e5Sderaadt 5309a2590e5Sderaadt while (length) { 53196978980Skrw incr = length > 255 ? 255 : length; 5329a2590e5Sderaadt 53396978980Skrw buf[bufix++] = code; 53496978980Skrw buf[bufix++] = incr; 53596978980Skrw memcpy(buf + bufix, options[code].data + ix, incr); 5369a2590e5Sderaadt 5379a2590e5Sderaadt length -= incr; 5389a2590e5Sderaadt ix += incr; 5396fc9f4f6Skrw bufix += incr; 5409a2590e5Sderaadt } 5419a2590e5Sderaadt } 54296978980Skrw 54396978980Skrw if (bufix < buflen) { 54496978980Skrw buf[bufix] = DHO_END; 54596978980Skrw lastopt = bufix; 54696978980Skrw } 54796978980Skrw 54851a35423Skrw return lastopt; 5499a2590e5Sderaadt } 5509a2590e5Sderaadt 551c714dadcShenning /* 552482123e8Skrw * Use vis() to encode characters of src and append encoded characters onto 553482123e8Skrw * dst. Also encode ", ', $, ` and \, to ensure resulting strings can be 554482123e8Skrw * represented as '"' delimited strings and safely passed to scripts. Surround 555482123e8Skrw * result with double quotes if emit_punct is true. 556482123e8Skrw */ 557bee06f07Skrw char * 558bee06f07Skrw pretty_print_string(unsigned char *src, size_t srclen, int emit_punct) 559482123e8Skrw { 560bee06f07Skrw static char string[8196]; 561482123e8Skrw char visbuf[5]; 562482123e8Skrw unsigned char *origsrc = src; 563bee06f07Skrw size_t rslt = 0; 564482123e8Skrw 565bee06f07Skrw memset(string, 0, sizeof(string)); 566bee06f07Skrw 5676fe46e93Skrw if (emit_punct != 0) 568bee06f07Skrw rslt = strlcat(string, "\"", sizeof(string)); 569482123e8Skrw 570482123e8Skrw for (; src < origsrc + srclen; src++) { 571482123e8Skrw if (*src && strchr("\"'$`\\", *src)) 572642cc348Skrw vis(visbuf, *src, VIS_ALL | VIS_OCTAL, *src+1); 573642cc348Skrw else 574482123e8Skrw vis(visbuf, *src, VIS_OCTAL, *src+1); 575bee06f07Skrw rslt = strlcat(string, visbuf, sizeof(string)); 576482123e8Skrw } 577482123e8Skrw 5786fe46e93Skrw if (emit_punct != 0) 579bee06f07Skrw rslt = strlcat(string, "\"", sizeof(string)); 580bee06f07Skrw 581bee06f07Skrw if (rslt >= sizeof(string)) 58251a35423Skrw return NULL; 583bee06f07Skrw 58451a35423Skrw return string; 585482123e8Skrw } 586482123e8Skrw 587482123e8Skrw /* 5885714f486Skrw * Must special case *_CLASSLESS_* route options due to the variable size 5895714f486Skrw * of the CIDR element in its CIA format. 5905714f486Skrw */ 5915c6453b8Skrw void 5925c6453b8Skrw pretty_print_classless_routes(unsigned char *src, size_t srclen, 5935c6453b8Skrw unsigned char *buf, size_t buflen) 5945714f486Skrw { 595da2eb076Skrw char bitsbuf[5]; /* to hold "/nn " */ 596f267fa4cSkrw struct in_addr dest, netmask, gateway; 5972aaf2bf4Skrw unsigned int bits, i, len; 5982aaf2bf4Skrw uint32_t m; 5995cbe9918Skrw int rslt; 6005714f486Skrw 601f267fa4cSkrw i = 0; 602f267fa4cSkrw while (i < srclen) { 603f267fa4cSkrw len = extract_classless_route(&src[i], srclen - i, 604f267fa4cSkrw &dest.s_addr, &netmask.s_addr, &gateway.s_addr); 6055cbe9918Skrw if (len == 0) 606f267fa4cSkrw goto bad; 607f267fa4cSkrw i += len; 608da2eb076Skrw 6092aaf2bf4Skrw m = ntohl(netmask.s_addr); 6102aaf2bf4Skrw bits = 32; 6112aaf2bf4Skrw while ((bits > 0) && ((m & 1) == 0)) { 6122aaf2bf4Skrw m >>= 1; 6132aaf2bf4Skrw bits--; 6142aaf2bf4Skrw } 6152aaf2bf4Skrw 6162aaf2bf4Skrw rslt = snprintf(bitsbuf, sizeof(bitsbuf), "/%d ", bits); 6171be0b429Skrw if (rslt == -1 || (unsigned int)rslt >= sizeof(bitsbuf)) 618f267fa4cSkrw goto bad; 619da2eb076Skrw 6205c6453b8Skrw if (strlen(buf) > 0) 6215c6453b8Skrw strlcat(buf, ", ", buflen); 622f267fa4cSkrw strlcat(buf, inet_ntoa(dest), buflen); 6235c6453b8Skrw strlcat(buf, bitsbuf, buflen); 6245c6453b8Skrw if (strlcat(buf, inet_ntoa(gateway), buflen) >= buflen) 625f267fa4cSkrw goto bad; 6265714f486Skrw } 6275714f486Skrw 6285c6453b8Skrw return; 6295c6453b8Skrw 630f267fa4cSkrw bad: 6315c6453b8Skrw memset(buf, 0, buflen); 6325714f486Skrw } 6335714f486Skrw 634968fe952Skrw int 635968fe952Skrw expand_search_domain_name(unsigned char *src, size_t srclen, int *offset, 636968fe952Skrw unsigned char *domain_search) 637968fe952Skrw { 6385d0bc970Skrw char *cursor; 639e0a6d2f1Skrw unsigned int i; 640e0a6d2f1Skrw int domain_name_len, label_len, pointer, pointed_len; 641968fe952Skrw 642968fe952Skrw cursor = domain_search + strlen(domain_search); 643968fe952Skrw domain_name_len = 0; 644968fe952Skrw 645968fe952Skrw i = *offset; 646968fe952Skrw while (i <= srclen) { 647968fe952Skrw label_len = src[i]; 648968fe952Skrw if (label_len == 0) { 649968fe952Skrw /* 650968fe952Skrw * A zero-length label marks the end of this 651968fe952Skrw * domain name. 652968fe952Skrw */ 653968fe952Skrw *offset = i + 1; 65451a35423Skrw return domain_name_len; 6556fe46e93Skrw } else if ((label_len & 0xC0) != 0) { 656968fe952Skrw /* This is a pointer to another list of labels. */ 657968fe952Skrw if (i + 1 >= srclen) { 658968fe952Skrw /* The pointer is truncated. */ 659b53f3a4dSkrw log_warnx("%s: truncated pointer in DHCP " 660b53f3a4dSkrw "Domain Search option", log_procname); 66151a35423Skrw return -1; 662968fe952Skrw } 663968fe952Skrw 664968fe952Skrw pointer = ((label_len & ~(0xC0)) << 8) + src[i + 1]; 665968fe952Skrw if (pointer >= *offset) { 666968fe952Skrw /* 667968fe952Skrw * The pointer must indicates a prior 668968fe952Skrw * occurance. 669968fe952Skrw */ 670b53f3a4dSkrw log_warnx("%s: invalid forward pointer in DHCP " 671b53f3a4dSkrw "Domain Search option compression", 672b53f3a4dSkrw log_procname); 67351a35423Skrw return -1; 674968fe952Skrw } 675968fe952Skrw 676968fe952Skrw pointed_len = expand_search_domain_name(src, srclen, 677968fe952Skrw &pointer, domain_search); 678968fe952Skrw domain_name_len += pointed_len; 679968fe952Skrw 680968fe952Skrw *offset = i + 2; 68151a35423Skrw return domain_name_len; 682968fe952Skrw } 683968fe952Skrw if (i + label_len + 1 > srclen) { 684b53f3a4dSkrw log_warnx("%s: truncated label in DHCP Domain Search " 685b53f3a4dSkrw "option", log_procname); 68651a35423Skrw return -1; 687968fe952Skrw } 688968fe952Skrw /* 689968fe952Skrw * Update the domain name length with the length of the 690968fe952Skrw * current label, plus a trailing dot ('.'). 691968fe952Skrw */ 692968fe952Skrw domain_name_len += label_len + 1; 693968fe952Skrw 694968fe952Skrw if (strlen(domain_search) + domain_name_len >= 695968fe952Skrw DHCP_DOMAIN_SEARCH_LEN) { 696b53f3a4dSkrw log_warnx("%s: domain search list too long", 697b53f3a4dSkrw log_procname); 69851a35423Skrw return -1; 699968fe952Skrw } 700968fe952Skrw 701968fe952Skrw /* Copy the label found. */ 702968fe952Skrw memcpy(cursor, src + i + 1, label_len); 703968fe952Skrw cursor[label_len] = '.'; 704968fe952Skrw 705968fe952Skrw /* Move cursor. */ 706968fe952Skrw i += label_len + 1; 707968fe952Skrw cursor += label_len + 1; 708968fe952Skrw } 709968fe952Skrw 710b53f3a4dSkrw log_warnx("%s: truncated DHCP Domain Search option", log_procname); 711968fe952Skrw 71251a35423Skrw return -1; 713968fe952Skrw } 714968fe952Skrw 715968fe952Skrw /* 716968fe952Skrw * Must special case DHO_DOMAIN_SEARCH because it is encoded as described 717968fe952Skrw * in RFC 1035 section 4.1.4. 718968fe952Skrw */ 7194d36d16aSkrw char * 7204d36d16aSkrw pretty_print_domain_search(unsigned char *src, size_t srclen) 721968fe952Skrw { 7224d36d16aSkrw static char domain_search[DHCP_DOMAIN_SEARCH_LEN]; 7235d0bc970Skrw unsigned char *cursor; 724e0a6d2f1Skrw unsigned int offset; 725e0a6d2f1Skrw int len, expanded_len, domains; 726968fe952Skrw 7274d36d16aSkrw memset(domain_search, 0, sizeof(domain_search)); 728968fe952Skrw 729968fe952Skrw /* Compute expanded length. */ 730968fe952Skrw expanded_len = len = 0; 731968fe952Skrw domains = 0; 732968fe952Skrw offset = 0; 733968fe952Skrw while (offset < srclen) { 734968fe952Skrw cursor = domain_search + strlen(domain_search); 735acea016dSkrw if (domain_search[0] != '\0') { 736968fe952Skrw *cursor = ' '; 737968fe952Skrw expanded_len++; 738968fe952Skrw } 739968fe952Skrw len = expand_search_domain_name(src, srclen, &offset, 740968fe952Skrw domain_search); 7414d36d16aSkrw if (len == -1) 74251a35423Skrw return NULL; 743968fe952Skrw domains++; 744968fe952Skrw expanded_len += len; 7454d36d16aSkrw if (domains > DHCP_DOMAIN_SEARCH_CNT) 74651a35423Skrw return NULL; 747968fe952Skrw } 748968fe952Skrw 74951a35423Skrw return domain_search; 750968fe952Skrw } 751968fe952Skrw 7525714f486Skrw /* 753c714dadcShenning * Format the specified option so that a human can easily read it. 754c714dadcShenning */ 755c714dadcShenning char * 756acf4c28bSkrw pretty_print_option(unsigned int code, struct option_data *option, 757acf4c28bSkrw int emit_punct) 7589a2590e5Sderaadt { 759bee06f07Skrw static char optbuf[8192]; /* XXX */ 760024801d2Skrw char fmtbuf[32]; 761024801d2Skrw struct in_addr foo; 762acf4c28bSkrw unsigned char *data = option->data; 7639a2590e5Sderaadt unsigned char *dp = data; 7648457ebc2Skrw char *op = optbuf, *buf, *name, *fmt; 765024801d2Skrw int hunksize = 0, numhunk = -1, numelem = 0; 766024801d2Skrw int i, j, k, opleft = sizeof(optbuf); 767acf4c28bSkrw int len = option->len; 768f3a8c5fdSkrw int opcount = 0; 769bce09e58Skrw int32_t int32val; 770024801d2Skrw uint32_t uint32val; 771024801d2Skrw uint16_t uint16val; 772024801d2Skrw char comma; 7739a2590e5Sderaadt 7742f18daabSkrw memset(optbuf, 0, sizeof(optbuf)); 7752f18daabSkrw 7769a2590e5Sderaadt /* Code should be between 0 and 255. */ 7772f18daabSkrw if (code > 255) { 778b4afd8f1Skrw log_warnx("%s: pretty_print_option: bad code %d", log_procname, 779b4afd8f1Skrw code); 7802f18daabSkrw goto done; 7812f18daabSkrw } 7829a2590e5Sderaadt 7836fe46e93Skrw if (emit_punct != 0) 7849a2590e5Sderaadt comma = ','; 7859a2590e5Sderaadt else 7869a2590e5Sderaadt comma = ' '; 7879a2590e5Sderaadt 7885714f486Skrw /* Handle the princess class options with weirdo formats. */ 7895714f486Skrw switch (code) { 7905714f486Skrw case DHO_CLASSLESS_STATIC_ROUTES: 7915714f486Skrw case DHO_CLASSLESS_MS_STATIC_ROUTES: 7925c6453b8Skrw pretty_print_classless_routes(dp, len, optbuf, 7935c6453b8Skrw sizeof(optbuf)); 7945714f486Skrw goto done; 7955714f486Skrw default: 7965714f486Skrw break; 7975714f486Skrw } 7985714f486Skrw 7998457ebc2Skrw name = code_to_name(code); 8008457ebc2Skrw fmt = code_to_format(code); 8018457ebc2Skrw 8029a2590e5Sderaadt /* Figure out the size of the data. */ 8038457ebc2Skrw for (i = 0; fmt[i]; i++) { 8046fe46e93Skrw if (numhunk == 0) { 805b4afd8f1Skrw log_warnx("%s: %s: excess information in format " 806b53f3a4dSkrw "string: %s", log_procname, name, &fmt[i]); 8072f18daabSkrw goto done; 8089a2590e5Sderaadt } 8099a2590e5Sderaadt numelem++; 8108457ebc2Skrw fmtbuf[i] = fmt[i]; 8118457ebc2Skrw switch (fmt[i]) { 8129a2590e5Sderaadt case 'A': 8139a2590e5Sderaadt --numelem; 8149a2590e5Sderaadt fmtbuf[i] = 0; 8159a2590e5Sderaadt numhunk = 0; 81629432cd9Sphessler if (hunksize == 0) { 817b53f3a4dSkrw log_warnx("%s: %s: no size indicator before A" 818b53f3a4dSkrw " in format string: %s", log_procname, 819b53f3a4dSkrw name, fmt); 8202f18daabSkrw goto done; 82129432cd9Sphessler } 8229a2590e5Sderaadt break; 8239a2590e5Sderaadt case 'X': 824c714dadcShenning for (k = 0; k < len; k++) 8256fe46e93Skrw if (isascii(data[k]) == 0 || 8266fe46e93Skrw isprint(data[k]) == 0) 8279a2590e5Sderaadt break; 828b54c879eShenning if (k == len) { 8299a2590e5Sderaadt fmtbuf[i] = 't'; 8309a2590e5Sderaadt numhunk = -2; 8319a2590e5Sderaadt } else { 8329a2590e5Sderaadt hunksize++; 8339a2590e5Sderaadt comma = ':'; 8349a2590e5Sderaadt numhunk = 0; 8359a2590e5Sderaadt } 8369a2590e5Sderaadt fmtbuf[i + 1] = 0; 8379a2590e5Sderaadt break; 8389a2590e5Sderaadt case 't': 8399a2590e5Sderaadt fmtbuf[i + 1] = 0; 8409a2590e5Sderaadt numhunk = -2; 8419a2590e5Sderaadt break; 8429a2590e5Sderaadt case 'I': 8439a2590e5Sderaadt case 'l': 8449a2590e5Sderaadt case 'L': 8459a2590e5Sderaadt hunksize += 4; 8469a2590e5Sderaadt break; 8479a2590e5Sderaadt case 'S': 8489a2590e5Sderaadt hunksize += 2; 8499a2590e5Sderaadt break; 8509a2590e5Sderaadt case 'B': 8519a2590e5Sderaadt case 'f': 8529a2590e5Sderaadt hunksize++; 8539a2590e5Sderaadt break; 8549a2590e5Sderaadt case 'e': 8559a2590e5Sderaadt break; 8569a2590e5Sderaadt default: 857b53f3a4dSkrw log_warnx("%s: %s: garbage in format string: %s", 858b53f3a4dSkrw log_procname, name, &fmt[i]); 8592f18daabSkrw goto done; 8609a2590e5Sderaadt } 8619a2590e5Sderaadt } 8629a2590e5Sderaadt 863d22f105fSkrw /* Check for too few bytes. */ 8649a2590e5Sderaadt if (hunksize > len) { 865b53f3a4dSkrw log_warnx("%s: %s: expecting at least %d bytes; got %d", 866b53f3a4dSkrw log_procname, name, hunksize, len); 8672f18daabSkrw goto done; 8689a2590e5Sderaadt } 869d22f105fSkrw /* Check for too many bytes. */ 8702f18daabSkrw if (numhunk == -1 && hunksize < len) { 871b53f3a4dSkrw log_warnx("%s: %s: expecting only %d bytes: got %d", 872b53f3a4dSkrw log_procname, name, hunksize, len); 8732f18daabSkrw goto done; 8742f18daabSkrw } 8759a2590e5Sderaadt 8769a2590e5Sderaadt /* If this is an array, compute its size. */ 8776fe46e93Skrw if (numhunk == 0) 8789a2590e5Sderaadt numhunk = len / hunksize; 8799a2590e5Sderaadt /* See if we got an exact number of hunks. */ 8802f18daabSkrw if (numhunk > 0 && numhunk * hunksize != len) { 881b53f3a4dSkrw log_warnx("%s: %s: expecting %d bytes: got %d", log_procname, 882b53f3a4dSkrw name, numhunk * hunksize, len); 8832f18daabSkrw goto done; 8842f18daabSkrw } 8859a2590e5Sderaadt 8869a2590e5Sderaadt /* A one-hunk array prints the same as a single hunk. */ 8879a2590e5Sderaadt if (numhunk < 0) 8889a2590e5Sderaadt numhunk = 1; 8899a2590e5Sderaadt 8909a2590e5Sderaadt /* Cycle through the array (or hunk) printing the data. */ 8919a2590e5Sderaadt for (i = 0; i < numhunk; i++) { 8929a2590e5Sderaadt for (j = 0; j < numelem; j++) { 8939a2590e5Sderaadt switch (fmtbuf[j]) { 8949a2590e5Sderaadt case 't': 895bee06f07Skrw buf = pretty_print_string(dp, len, emit_punct); 896bee06f07Skrw if (buf == NULL) 897bee06f07Skrw opcount = -1; 898bee06f07Skrw else 899bee06f07Skrw opcount = strlcat(op, buf, opleft); 9009a2590e5Sderaadt break; 9019a2590e5Sderaadt case 'I': 902e95625edSkrw memcpy(&foo.s_addr, dp, sizeof(foo.s_addr)); 903f3a8c5fdSkrw opcount = snprintf(op, opleft, "%s", 904f3a8c5fdSkrw inet_ntoa(foo)); 905e95625edSkrw dp += sizeof(foo.s_addr); 9069a2590e5Sderaadt break; 9079a2590e5Sderaadt case 'l': 908bce09e58Skrw memcpy(&int32val, dp, sizeof(int32val)); 909bce09e58Skrw opcount = snprintf(op, opleft, "%d", 910bce09e58Skrw ntohl(int32val)); 911bce09e58Skrw dp += sizeof(int32val); 9129a2590e5Sderaadt break; 9139a2590e5Sderaadt case 'L': 914bce09e58Skrw memcpy(&uint32val, dp, sizeof(uint32val)); 915bce09e58Skrw opcount = snprintf(op, opleft, "%u", 916bce09e58Skrw ntohl(uint32val)); 917bce09e58Skrw dp += sizeof(uint32val); 9189a2590e5Sderaadt break; 9199a2590e5Sderaadt case 'S': 920bce09e58Skrw memcpy(&uint16val, dp, sizeof(uint16val)); 921bce09e58Skrw opcount = snprintf(op, opleft, "%hu", 922bce09e58Skrw ntohs(uint16val)); 923bce09e58Skrw dp += sizeof(uint16val); 9249a2590e5Sderaadt break; 9259a2590e5Sderaadt case 'B': 926221bd6c0Skrw opcount = snprintf(op, opleft, "%u", *dp); 927de3ca9dbSkrw dp++; 9289a2590e5Sderaadt break; 929920d03efSkrw case 'X': 930de3ca9dbSkrw opcount = snprintf(op, opleft, "%x", *dp); 931de3ca9dbSkrw dp++; 9329a2590e5Sderaadt break; 9339a2590e5Sderaadt case 'f': 934f3a8c5fdSkrw opcount = snprintf(op, opleft, "%s", 935f3a8c5fdSkrw *dp ? "true" : "false"); 936de3ca9dbSkrw dp++; 9379a2590e5Sderaadt break; 9389a2590e5Sderaadt default: 939b53f3a4dSkrw log_warnx("%s: unexpected format code %c", 940b53f3a4dSkrw log_procname, fmtbuf[j]); 9419a2590e5Sderaadt goto toobig; 942f3a8c5fdSkrw } 943f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 944f3a8c5fdSkrw goto toobig; 945f3a8c5fdSkrw opleft -= opcount; 946f3a8c5fdSkrw op += opcount; 9479a2590e5Sderaadt if (j + 1 < numelem && comma != ':') { 948f3a8c5fdSkrw opcount = snprintf(op, opleft, " "); 949f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 950f3a8c5fdSkrw goto toobig; 951f3a8c5fdSkrw opleft -= opcount; 952f3a8c5fdSkrw op += opcount; 9539a2590e5Sderaadt } 9549a2590e5Sderaadt } 9559a2590e5Sderaadt if (i + 1 < numhunk) { 956f3a8c5fdSkrw opcount = snprintf(op, opleft, "%c", comma); 957f3a8c5fdSkrw if (opcount >= opleft || opcount == -1) 9589a2590e5Sderaadt goto toobig; 959f3a8c5fdSkrw opleft -= opcount; 960f3a8c5fdSkrw op += opcount; 961f3a8c5fdSkrw } 9629a2590e5Sderaadt } 9632f18daabSkrw 9642f18daabSkrw done: 96551a35423Skrw return optbuf; 9662f18daabSkrw 9679a2590e5Sderaadt toobig: 9682f18daabSkrw memset(optbuf, 0, sizeof(optbuf)); 96951a35423Skrw return optbuf; 9709a2590e5Sderaadt } 9719a2590e5Sderaadt 972b414edd1Skrw struct option_data * 973b414edd1Skrw unpack_options(struct dhcp_packet *packet) 9749a2590e5Sderaadt { 975cb26da20Skrw static struct option_data options[DHO_COUNT]; 976b414edd1Skrw int i; 9779a2590e5Sderaadt 978cb26da20Skrw for (i = 0; i < DHO_COUNT; i++) { 979b414edd1Skrw free(options[i].data); 980b414edd1Skrw options[i].data = NULL; 981b414edd1Skrw options[i].len = 0; 982b414edd1Skrw } 98302e02bd5Skrw 98402e02bd5Skrw if (memcmp(&packet->options, DHCP_OPTIONS_COOKIE, 4) == 0) { 98502e02bd5Skrw /* Parse the BOOTP/DHCP options field. */ 986b414edd1Skrw parse_option_buffer(options, &packet->options[4], 987b414edd1Skrw sizeof(packet->options) - 4); 98802e02bd5Skrw 989b414edd1Skrw /* DHCP packets can also use overload areas for options. */ 9906fe46e93Skrw if (options[DHO_DHCP_MESSAGE_TYPE].data != NULL && 9916fe46e93Skrw options[DHO_DHCP_OPTION_OVERLOAD].data != NULL) { 992b4afd8f1Skrw if ((options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 1) != 993b4afd8f1Skrw 0) 994b414edd1Skrw parse_option_buffer(options, 99502e02bd5Skrw (unsigned char *)packet->file, 99602e02bd5Skrw sizeof(packet->file)); 997b4afd8f1Skrw if ((options[DHO_DHCP_OPTION_OVERLOAD].data[0] & 2) != 998b4afd8f1Skrw 0) 999b414edd1Skrw parse_option_buffer(options, 100002e02bd5Skrw (unsigned char *)packet->sname, 100102e02bd5Skrw sizeof(packet->sname)); 100202e02bd5Skrw } 100302e02bd5Skrw } 100402e02bd5Skrw 1005b414edd1Skrw return options; 10069a2590e5Sderaadt } 1007