1 /* SPDX-License-Identifier: BSD-2-Clause */ 2 /* 3 * dhcpcd - DHCP client daemon 4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name> 5 * All rights reserved 6 7 * Redistribution and use in source and binary forms, with or without 8 * modification, are permitted provided that the following conditions 9 * are met: 10 * 1. Redistributions of source code must retain the above copyright 11 * notice, this list of conditions and the following disclaimer. 12 * 2. Redistributions in binary form must reproduce the above copyright 13 * notice, this list of conditions and the following disclaimer in the 14 * documentation and/or other materials provided with the distribution. 15 * 16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND 17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE 18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE 19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE 20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL 21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS 22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) 23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT 24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY 25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 29 #ifndef DHCPCD_H 30 #define DHCPCD_H 31 32 #include <sys/socket.h> 33 #include <net/if.h> 34 35 #include <stdio.h> 36 37 #include "config.h" 38 #ifdef HAVE_SYS_QUEUE_H 39 #include <sys/queue.h> 40 #endif 41 42 #include "defs.h" 43 #include "control.h" 44 #include "if-options.h" 45 46 #define HWADDR_LEN 20 47 #define IF_SSIDLEN 32 48 #define PROFILE_LEN 64 49 #define SECRET_LEN 64 50 51 #define IF_INACTIVE 0 52 #define IF_ACTIVE 1 53 #define IF_ACTIVE_USER 2 54 55 #define LINK_UP 1 56 #define LINK_UNKNOWN 0 57 #define LINK_DOWN -1 58 #define LINK_DOWN_IFFUP -2 59 60 #define IF_DATA_IPV4 0 61 #define IF_DATA_ARP 1 62 #define IF_DATA_IPV4LL 2 63 #define IF_DATA_DHCP 3 64 #define IF_DATA_IPV6 4 65 #define IF_DATA_IPV6ND 5 66 #define IF_DATA_DHCP6 6 67 #define IF_DATA_MAX 7 68 69 /* If the interface does not support carrier status (ie PPP), 70 * dhcpcd can poll it for the relevant flags periodically */ 71 #define IF_POLL_UP 100 /* milliseconds */ 72 73 #ifdef __QNX__ 74 /* QNX carries defines for, but does not actually support PF_LINK */ 75 #undef IFLR_ACTIVE 76 #endif 77 78 struct interface { 79 struct dhcpcd_ctx *ctx; 80 TAILQ_ENTRY(interface) next; 81 char name[IF_NAMESIZE]; 82 unsigned int index; 83 unsigned int active; 84 unsigned int flags; 85 uint16_t hwtype; /* ARPHRD_ETHER for example */ 86 unsigned char hwaddr[HWADDR_LEN]; 87 uint8_t hwlen; 88 unsigned short vlanid; 89 unsigned int metric; 90 int carrier; 91 bool wireless; 92 uint8_t ssid[IF_SSIDLEN]; 93 unsigned int ssid_len; 94 95 char profile[PROFILE_LEN]; 96 struct if_options *options; 97 void *if_data[IF_DATA_MAX]; 98 }; 99 TAILQ_HEAD(if_head, interface); 100 101 #include "privsep.h" 102 103 #ifdef INET6 104 /* dhcpcd requires CMSG_SPACE to evaluate to a compile time constant. */ 105 #if defined(__QNX) || \ 106 (defined(__NetBSD_Version__) && __NetBSD_Version__ < 600000000) 107 #undef CMSG_SPACE 108 #endif 109 110 #ifndef ALIGNBYTES 111 #define ALIGNBYTES (sizeof(int) - 1) 112 #endif 113 #ifndef ALIGN 114 #define ALIGN(p) (((unsigned int)(p) + ALIGNBYTES) & ~ALIGNBYTES) 115 #endif 116 #ifndef CMSG_SPACE 117 #define CMSG_SPACE(len) (ALIGN(sizeof(struct cmsghdr)) + ALIGN(len)) 118 #endif 119 120 #define IP6BUFLEN (CMSG_SPACE(sizeof(struct in6_pktinfo)) + \ 121 CMSG_SPACE(sizeof(int))) 122 #endif 123 124 struct passwd; 125 126 struct dhcpcd_ctx { 127 char pidfile[sizeof(PIDFILE) + IF_NAMESIZE + 1]; 128 char vendor[256]; 129 int fork_fd; /* FD for the fork init signal pipe */ 130 const char *cffile; 131 unsigned long long options; 132 char *logfile; 133 int argc; 134 char **argv; 135 int ifac; /* allowed interfaces */ 136 char **ifav; /* allowed interfaces */ 137 int ifdc; /* denied interfaces */ 138 char **ifdv; /* denied interfaces */ 139 int ifc; /* listed interfaces */ 140 char **ifv; /* listed interfaces */ 141 int ifcc; /* configured interfaces */ 142 char **ifcv; /* configured interfaces */ 143 unsigned char *duid; 144 size_t duid_len; 145 struct if_head *ifaces; 146 147 char *ctl_buf; 148 size_t ctl_buflen; 149 size_t ctl_bufpos; 150 size_t ctl_extra; 151 152 rb_tree_t routes; /* our routes */ 153 #ifdef RT_FREE_ROUTE_TABLE 154 rb_tree_t froutes; /* free routes for re-use */ 155 #endif 156 size_t rt_order; /* route order storage */ 157 158 int pf_inet_fd; 159 #ifdef PF_LINK 160 int pf_link_fd; 161 #endif 162 void *priv; 163 int link_fd; 164 #ifndef SMALL 165 int link_rcvbuf; 166 #endif 167 int seq; /* route message sequence no */ 168 int sseq; /* successful seq no sent */ 169 170 #ifdef USE_SIGNALS 171 sigset_t sigset; 172 #endif 173 struct eloop *eloop; 174 175 char *script; 176 #ifdef HAVE_OPEN_MEMSTREAM 177 FILE *script_fp; 178 #endif 179 char *script_buf; 180 size_t script_buflen; 181 char **script_env; 182 size_t script_envlen; 183 184 int control_fd; 185 int control_unpriv_fd; 186 struct fd_list_head control_fds; 187 char control_sock[sizeof(CONTROLSOCKET) + IF_NAMESIZE]; 188 gid_t control_group; 189 190 /* DHCP Enterprise options, RFC3925 */ 191 struct dhcp_opt *vivso; 192 size_t vivso_len; 193 194 char *randomstate; /* original state */ 195 196 /* For filtering RTM_MISS messages per router */ 197 #ifdef BSD 198 uint8_t *rt_missfilter; 199 size_t rt_missfilterlen; 200 size_t rt_missfiltersize; 201 #endif 202 203 #ifdef PRIVSEP 204 struct passwd *ps_user; /* struct passwd for privsep user */ 205 pid_t ps_root_pid; 206 int ps_root_fd; /* Privileged Actioneer commands */ 207 int ps_data_fd; /* Data from root spawned processes */ 208 struct eloop *ps_eloop; /* eloop for polling root data */ 209 struct ps_process_head ps_processes; /* List of spawned processes */ 210 pid_t ps_inet_pid; 211 int ps_inet_fd; /* Network Proxy commands and data */ 212 pid_t ps_control_pid; 213 int ps_control_fd; /* Control Proxy - generic listener */ 214 int ps_control_data_fd; /* Control Proxy - data query */ 215 struct fd_list *ps_control; /* Queue for the above */ 216 struct fd_list *ps_control_client; /* Queue for the above */ 217 #endif 218 219 #ifdef INET 220 struct dhcp_opt *dhcp_opts; 221 size_t dhcp_opts_len; 222 223 int udp_rfd; 224 int udp_wfd; 225 226 /* Our aggregate option buffer. 227 * We ONLY use this when options are split, which for most purposes is 228 * practically never. See RFC3396 for details. */ 229 uint8_t *opt_buffer; 230 size_t opt_buffer_len; 231 #endif 232 #ifdef INET6 233 uint8_t *secret; 234 size_t secret_len; 235 236 #ifndef __sun 237 int nd_fd; 238 #endif 239 struct ra_head *ra_routers; 240 241 struct dhcp_opt *nd_opts; 242 size_t nd_opts_len; 243 #ifdef DHCP6 244 int dhcp6_rfd; 245 int dhcp6_wfd; 246 struct dhcp_opt *dhcp6_opts; 247 size_t dhcp6_opts_len; 248 #endif 249 250 #ifndef __linux__ 251 int ra_global; 252 #endif 253 #endif /* INET6 */ 254 255 #ifdef PLUGIN_DEV 256 char *dev_load; 257 int dev_fd; 258 struct dev *dev; 259 void *dev_handle; 260 #endif 261 }; 262 263 #ifdef USE_SIGNALS 264 extern const int dhcpcd_signals[]; 265 extern const size_t dhcpcd_signals_len; 266 extern const int dhcpcd_signals_ignore[]; 267 extern const size_t dhcpcd_signals_ignore_len; 268 #endif 269 270 extern const char *dhcpcd_default_script; 271 272 int dhcpcd_ifafwaiting(const struct interface *); 273 int dhcpcd_afwaiting(const struct dhcpcd_ctx *); 274 void dhcpcd_daemonise(struct dhcpcd_ctx *); 275 276 void dhcpcd_linkoverflow(struct dhcpcd_ctx *); 277 int dhcpcd_handleargs(struct dhcpcd_ctx *, struct fd_list *, int, char **); 278 void dhcpcd_handlecarrier(struct dhcpcd_ctx *, int, unsigned int, const char *); 279 int dhcpcd_handleinterface(void *, int, const char *); 280 void dhcpcd_handlehwaddr(struct interface *, uint16_t, const void *, uint8_t); 281 void dhcpcd_dropinterface(struct interface *, const char *); 282 int dhcpcd_selectprofile(struct interface *, const char *); 283 284 void dhcpcd_startinterface(void *); 285 void dhcpcd_activateinterface(struct interface *, unsigned long long); 286 287 #endif 288