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annotate src/dhcpcd.h @ 5526:b1a3d9055662 draft

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privsep: Allow logfile reopening in a chroot Now that only the privileged actioneer does the actual logging we can safely reopen the file we are logging to. This also closes and re-opens the syslog connection.
author Roy Marples <roy@marples.name>
date Fri, 30 Oct 2020 14:19:16 +0000
parents 26b5d9bc2985
children 4492d1d88fdd
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rev   line source
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c7df03794de3 Add SPDX identifiers to all dhcpcd source files.
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1 /* SPDX-License-Identifier: BSD-2-Clause */
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2 /*
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3 * dhcpcd - DHCP client daemon
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555d7d1a4939 Welcome to 2020!
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4 * Copyright (c) 2006-2020 Roy Marples <roy@marples.name>
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5 * All rights reserved
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6
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7 * Redistribution and use in source and binary forms, with or without
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8 * modification, are permitted provided that the following conditions
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9 * are met:
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10 * 1. Redistributions of source code must retain the above copyright
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11 * notice, this list of conditions and the following disclaimer.
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12 * 2. Redistributions in binary form must reproduce the above copyright
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13 * notice, this list of conditions and the following disclaimer in the
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14 * documentation and/or other materials provided with the distribution.
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15 *
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16 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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17 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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18 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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19 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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20 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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21 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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22 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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23 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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24 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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25 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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26 * SUCH DAMAGE.
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27 */
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28
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29 #ifndef DHCPCD_H
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30 #define DHCPCD_H
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31
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32 #include <sys/socket.h>
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33 #include <net/if.h>
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34
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35 #include <stdio.h>
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36
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37 #include "config.h"
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38 #ifdef HAVE_SYS_QUEUE_H
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39 #include <sys/queue.h>
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40 #endif
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41
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42 #include "defs.h"
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43 #include "control.h"
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44 #include "if-options.h"
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45
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46 #define HWADDR_LEN 20
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47 #define IF_SSIDLEN 32
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48 #define PROFILE_LEN 64
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49 #define SECRET_LEN 64
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50
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51 #define IF_INACTIVE 0
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52 #define IF_ACTIVE 1
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53 #define IF_ACTIVE_USER 2
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54
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55 #define LINK_UP 1
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56 #define LINK_UNKNOWN 0
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57 #define LINK_DOWN -1
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58
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59 #define IF_DATA_IPV4 0
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60 #define IF_DATA_ARP 1
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61 #define IF_DATA_IPV4LL 2
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62 #define IF_DATA_DHCP 3
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63 #define IF_DATA_IPV6 4
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64 #define IF_DATA_IPV6ND 5
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65 #define IF_DATA_DHCP6 6
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66 #define IF_DATA_MAX 7
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67
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68 #ifdef __QNX__
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69 /* QNX carries defines for, but does not actually support PF_LINK */
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70 #undef IFLR_ACTIVE
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71 #endif
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72
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73 struct interface {
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74 struct dhcpcd_ctx *ctx;
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75 TAILQ_ENTRY(interface) next;
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76 char name[IF_NAMESIZE];
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77 unsigned int index;
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78 unsigned int active;
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79 unsigned int flags;
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80 uint16_t hwtype; /* ARPHRD_ETHER for example */
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81 unsigned char hwaddr[HWADDR_LEN];
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82 uint8_t hwlen;
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83 unsigned short vlanid;
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84 unsigned int metric;
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85 int carrier;
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86 bool wireless;
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87 uint8_t ssid[IF_SSIDLEN];
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88 unsigned int ssid_len;
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89
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90 char profile[PROFILE_LEN];
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91 struct if_options *options;
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92 void *if_data[IF_DATA_MAX];
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93 };
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94 TAILQ_HEAD(if_head, interface);
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95
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96 #include "privsep.h"
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97
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98 /* dhcpcd requires CMSG_SPACE to evaluate to a compile time constant. */
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99 #if defined(__QNX) || \
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100 (defined(__NetBSD_Version__) && __NetBSD_Version__ < 600000000)
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101 #undef CMSG_SPACE
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102 #endif
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103
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104 #ifndef ALIGNBYTES
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105 #define ALIGNBYTES (sizeof(int) - 1)
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106 #endif
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107 #ifndef ALIGN
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108 #define ALIGN(p) (((unsigned int)(p) + ALIGNBYTES) & ~ALIGNBYTES)
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109 #endif
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110 #ifndef CMSG_SPACE
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111 #define CMSG_SPACE(len) (ALIGN(sizeof(struct cmsghdr)) + ALIGN(len))
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112 #endif
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113
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114 struct passwd;
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115
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116 struct dhcpcd_ctx {
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117 char pidfile[sizeof(PIDFILE) + IF_NAMESIZE + 1];
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118 char vendor[256];
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119 bool stdin_valid; /* It's possible stdin, stdout and stderr */
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120 bool stdout_valid; /* could be closed when dhcpcd starts. */
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121 bool stderr_valid;
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122 int stderr_fd; /* FD for logging to stderr */
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123 int fork_fd; /* FD for the fork init signal pipe */
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124 const char *cffile;
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125 unsigned long long options;
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126 char *logfile;
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127 int argc;
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128 char **argv;
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129 int ifac; /* allowed interfaces */
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130 char **ifav; /* allowed interfaces */
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131 int ifdc; /* denied interfaces */
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132 char **ifdv; /* denied interfaces */
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133 int ifc; /* listed interfaces */
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134 char **ifv; /* listed interfaces */
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135 int ifcc; /* configured interfaces */
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136 char **ifcv; /* configured interfaces */
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137 uint8_t duid_type;
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diff changeset
138 unsigned char *duid;
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diff changeset
139 size_t duid_len;
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diff changeset
140 struct if_head *ifaces;
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141
5328
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parents: 5311
diff changeset
142 char *ctl_buf;
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parents: 5311
diff changeset
143 size_t ctl_buflen;
ea68407e5ac8 privsep: Implement a resource limited sandbox
Roy Marples <roy@marples.name>
parents: 5311
diff changeset
144 size_t ctl_bufpos;
ea68407e5ac8 privsep: Implement a resource limited sandbox
Roy Marples <roy@marples.name>
parents: 5311
diff changeset
145 size_t ctl_extra;
ea68407e5ac8 privsep: Implement a resource limited sandbox
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parents: 5311
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146
4379
e9573d5cbf1e Replace route TAILQ macros with rbtree(3) from NetBSD.
Roy Marples <roy@marples.name>
parents: 4372
diff changeset
147 rb_tree_t routes; /* our routes */
4400
2d6a2c8c6b56 route: Remove kroutes and make froutes optional
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parents: 4379
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148 #ifdef RT_FREE_ROUTE_TABLE
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e9573d5cbf1e Replace route TAILQ macros with rbtree(3) from NetBSD.
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parents: 4372
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149 rb_tree_t froutes; /* free routes for re-use */
4400
2d6a2c8c6b56 route: Remove kroutes and make froutes optional
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150 #endif
4522
e2582c7c7e1d route: Use order from message / config
Roy Marples <roy@marples.name>
parents: 4511
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151 size_t rt_order; /* route order storage */
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152
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153 int pf_inet_fd;
5311
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parents: 5255
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154 #ifdef PF_LINK
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diff changeset
155 int pf_link_fd;
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156 #endif
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157 void *priv;
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158 int link_fd;
4415
4eb8ce6f854c options: add link_rcvbuf variable
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parents: 4400
diff changeset
159 #ifndef SMALL
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parents: 4400
diff changeset
160 int link_rcvbuf;
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parents: 4400
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161 #endif
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162 int seq; /* route message sequence no */
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163 int sseq; /* successful seq no sent */
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164
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165 #ifdef USE_SIGNALS
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166 sigset_t sigset;
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167 #endif
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168 struct eloop *eloop;
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169
5255
ee23398a68db dhcpcd: Move the script file from per interface to global context
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170 char *script;
4535
f2ddefe6c69e script: Write variables to a FILE
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parents: 4522
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171 #ifdef HAVE_OPEN_MEMSTREAM
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172 FILE *script_fp;
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Roy Marples <roy@marples.name>
parents: 4522
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173 #endif
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Roy Marples <roy@marples.name>
parents: 4522
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174 char *script_buf;
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Roy Marples <roy@marples.name>
parents: 4522
diff changeset
175 size_t script_buflen;
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Roy Marples <roy@marples.name>
parents: 4522
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176 char **script_env;
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Roy Marples <roy@marples.name>
parents: 4522
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177 size_t script_envlen;
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parents: 4522
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178
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179 int control_fd;
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180 int control_unpriv_fd;
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181 struct fd_list_head control_fds;
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182 char control_sock[sizeof(CONTROLSOCKET) + IF_NAMESIZE];
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183 gid_t control_group;
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184
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185 /* DHCP Enterprise options, RFC3925 */
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186 struct dhcp_opt *vivso;
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187 size_t vivso_len;
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188
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189 char *randomstate; /* original state */
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190
5057
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
diff changeset
191 /* For filtering RTM_MISS messages per router */
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
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192 #ifdef BSD
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
diff changeset
193 uint8_t *rt_missfilter;
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
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194 size_t rt_missfilterlen;
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
diff changeset
195 size_t rt_missfiltersize;
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
Roy Marples <roy@marples.name>
parents: 4992
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196 #endif
a5fd2097d40f BSD: Add support for RO_MISSFILTER route(4) socket option
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parents: 4992
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197
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
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198 #ifdef PRIVSEP
4992
b7dca2a85056 privsep: Only fetch PRIVSEP_USER at init
Roy Marples <roy@marples.name>
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199 struct passwd *ps_user; /* struct passwd for privsep user */
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
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200 pid_t ps_root_pid;
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
201 int ps_root_fd; /* Privileged Actioneer commands */
5526
b1a3d9055662 privsep: Allow logfile reopening in a chroot
Roy Marples <roy@marples.name>
parents: 5525
diff changeset
202 int ps_log_fd; /* chroot logging */
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
203 int ps_data_fd; /* Data from root spawned processes */
4851
b615d58905ad privsep: Use another eloop instead of a blocking read.
Roy Marples <roy@marples.name>
parents: 4840
diff changeset
204 struct eloop *ps_eloop; /* eloop for polling root data */
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
205 struct ps_process_head ps_processes; /* List of spawned processes */
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
206 pid_t ps_inet_pid;
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
207 int ps_inet_fd; /* Network Proxy commands and data */
5328
ea68407e5ac8 privsep: Implement a resource limited sandbox
Roy Marples <roy@marples.name>
parents: 5311
diff changeset
208 pid_t ps_control_pid;
5332
b22045bba8b9 privsep: control proxy is no longer optional
Roy Marples <roy@marples.name>
parents: 5328
diff changeset
209 int ps_control_fd; /* Control Proxy - generic listener */
b22045bba8b9 privsep: control proxy is no longer optional
Roy Marples <roy@marples.name>
parents: 5328
diff changeset
210 int ps_control_data_fd; /* Control Proxy - data query */
b22045bba8b9 privsep: control proxy is no longer optional
Roy Marples <roy@marples.name>
parents: 5328
diff changeset
211 struct fd_list *ps_control; /* Queue for the above */
b22045bba8b9 privsep: control proxy is no longer optional
Roy Marples <roy@marples.name>
parents: 5328
diff changeset
212 struct fd_list *ps_control_client; /* Queue for the above */
4840
073fcd86db9b privsep: Add support for priviledge separation
Roy Marples <roy@marples.name>
parents: 4549
diff changeset
213 #endif
073fcd86db9b privsep: Add support for priviledge separation
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214
3932
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215 #ifdef INET
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216 struct dhcp_opt *dhcp_opts;
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diff changeset
217 size_t dhcp_opts_len;
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diff changeset
218
5231
a2c342295221 privsep: Enable Capsicum for all processes.
Roy Marples <roy@marples.name>
parents: 5227
diff changeset
219 int udp_rfd;
a2c342295221 privsep: Enable Capsicum for all processes.
Roy Marples <roy@marples.name>
parents: 5227
diff changeset
220 int udp_wfd;
3932
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221
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Roy Marples <roy@marples.name>
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diff changeset
222 /* Our aggregate option buffer.
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Roy Marples <roy@marples.name>
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223 * We ONLY use this when options are split, which for most purposes is
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224 * practically never. See RFC3396 for details. */
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diff changeset
225 uint8_t *opt_buffer;
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diff changeset
226 size_t opt_buffer_len;
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diff changeset
227 #endif
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228 #ifdef INET6
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diff changeset
229 uint8_t *secret;
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diff changeset
230 size_t secret_len;
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231
4471
15b9659186e8 sun: Open an IPv6ND socket per interface
Roy Marples <roy@marples.name>
parents: 4372
diff changeset
232 #ifndef __sun
3932
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diff changeset
233 int nd_fd;
4471
15b9659186e8 sun: Open an IPv6ND socket per interface
Roy Marples <roy@marples.name>
parents: 4372
diff changeset
234 #endif
3932
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diff changeset
235 struct ra_head *ra_routers;
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236
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diff changeset
237 struct dhcp_opt *nd_opts;
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parents:
diff changeset
238 size_t nd_opts_len;
4349
f87c2ed9ff46 DHCP6: Remove #defines for functions when DHCP6 is disabled
Roy Marples <roy@marples.name>
parents: 4333
diff changeset
239 #ifdef DHCP6
5231
a2c342295221 privsep: Enable Capsicum for all processes.
Roy Marples <roy@marples.name>
parents: 5227
diff changeset
240 int dhcp6_rfd;
a2c342295221 privsep: Enable Capsicum for all processes.
Roy Marples <roy@marples.name>
parents: 5227
diff changeset
241 int dhcp6_wfd;
3932
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diff changeset
242 struct dhcp_opt *dhcp6_opts;
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parents:
diff changeset
243 size_t dhcp6_opts_len;
4349
f87c2ed9ff46 DHCP6: Remove #defines for functions when DHCP6 is disabled
Roy Marples <roy@marples.name>
parents: 4333
diff changeset
244 #endif
3932
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245
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diff changeset
246 #ifndef __linux__
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parents:
diff changeset
247 int ra_global;
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diff changeset
248 #endif
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diff changeset
249 #endif /* INET6 */
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250
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Roy Marples <roy@marples.name>
parents:
diff changeset
251 #ifdef PLUGIN_DEV
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diff changeset
252 char *dev_load;
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parents:
diff changeset
253 int dev_fd;
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Roy Marples <roy@marples.name>
parents:
diff changeset
254 struct dev *dev;
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Roy Marples <roy@marples.name>
parents:
diff changeset
255 void *dev_handle;
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Roy Marples <roy@marples.name>
parents:
diff changeset
256 #endif
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Roy Marples <roy@marples.name>
parents:
diff changeset
257 };
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parents:
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258
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diff changeset
259 #ifdef USE_SIGNALS
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parents:
diff changeset
260 extern const int dhcpcd_signals[];
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Roy Marples <roy@marples.name>
parents:
diff changeset
261 extern const size_t dhcpcd_signals_len;
5227
7406014c9120 dhcpcd: allow sigpipe in scripts.
Roy Marples <roy@marples.name>
parents: 5209
diff changeset
262 extern const int dhcpcd_signals_ignore[];
7406014c9120 dhcpcd: allow sigpipe in scripts.
Roy Marples <roy@marples.name>
parents: 5209
diff changeset
263 extern const size_t dhcpcd_signals_ignore_len;
3932
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parents:
diff changeset
264 #endif
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265
5255
ee23398a68db dhcpcd: Move the script file from per interface to global context
Roy Marples <roy@marples.name>
parents: 5231
diff changeset
266 extern const char *dhcpcd_default_script;
ee23398a68db dhcpcd: Move the script file from per interface to global context
Roy Marples <roy@marples.name>
parents: 5231
diff changeset
267
3932
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Roy Marples <roy@marples.name>
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diff changeset
268 int dhcpcd_ifafwaiting(const struct interface *);
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Roy Marples <roy@marples.name>
parents:
diff changeset
269 int dhcpcd_afwaiting(const struct dhcpcd_ctx *);
4856
a0a073f9c5ef dhcpcd: Rework daemonisation
Roy Marples <roy@marples.name>
parents: 4851
diff changeset
270 void dhcpcd_daemonise(struct dhcpcd_ctx *);
3932
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parents:
diff changeset
271
4235
27bad70c0d9c link: detect buffer overflow / desync and relearn interface state
Roy Marples <roy@marples.name>
parents: 4197
diff changeset
272 void dhcpcd_linkoverflow(struct dhcpcd_ctx *);
3932
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Roy Marples <roy@marples.name>
parents:
diff changeset
273 int dhcpcd_handleargs(struct dhcpcd_ctx *, struct fd_list *, int, char **);
5486
8e2b8ce8c972 BSD: struct if_data->ifi_link_state is the single source of truth
Roy Marples <roy@marples.name>
parents: 5467
diff changeset
274 void dhcpcd_handlecarrier(struct interface *, int, unsigned int);
3932
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parents:
diff changeset
275 int dhcpcd_handleinterface(void *, int, const char *);
5168
1f5dc6102f9b if: support changing hardware address type on Linux
Roy Marples <roy@marples.name>
parents: 5166
diff changeset
276 void dhcpcd_handlehwaddr(struct interface *, uint16_t, const void *, uint8_t);
3932
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Roy Marples <roy@marples.name>
parents:
diff changeset
277 void dhcpcd_dropinterface(struct interface *, const char *);
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278 int dhcpcd_selectprofile(struct interface *, const char *);
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279
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280 void dhcpcd_startinterface(void *);
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281 void dhcpcd_activateinterface(struct interface *, unsigned long long);
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282
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283 #endif